--- /dev/null
+/*
+ * Copyright (c) 2008 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
+/* $apfw: pf.c,v 1.37 2008/12/05 23:10:20 jhw Exp $ */
+/* $OpenBSD: pf.c,v 1.567 2008/02/20 23:40:13 henning Exp $ */
+
+/*
+ * Copyright (c) 2001 Daniel Hartmeier
+ * Copyright (c) 2002,2003 Henning Brauer
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials provided
+ * with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Effort sponsored in part by the Defense Advanced Research Projects
+ * Agency (DARPA) and Air Force Research Laboratory, Air Force
+ * Materiel Command, USAF, under agreement number F30602-01-2-0537.
+ *
+ */
+
+#include <machine/endian.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/filio.h>
+#include <sys/socket.h>
+#include <sys/socketvar.h>
+#include <sys/kernel.h>
+#include <sys/time.h>
+#include <sys/proc.h>
+#include <sys/random.h>
+#include <sys/mcache.h>
+
+#include <libkern/crypto/md5.h>
+#include <libkern/libkern.h>
+
+#include <mach/thread_act.h>
+
+#include <net/if.h>
+#include <net/if_types.h>
+#include <net/bpf.h>
+#include <net/route.h>
+
+#include <netinet/in.h>
+#include <netinet/in_var.h>
+#include <netinet/in_systm.h>
+#include <netinet/ip.h>
+#include <netinet/ip_var.h>
+#include <netinet/tcp.h>
+#include <netinet/tcp_seq.h>
+#include <netinet/udp.h>
+#include <netinet/ip_icmp.h>
+#include <netinet/in_pcb.h>
+#include <netinet/tcp_timer.h>
+#include <netinet/tcp_var.h>
+#include <netinet/tcp_fsm.h>
+#include <netinet/udp_var.h>
+#include <netinet/icmp_var.h>
+#include <net/if_ether.h>
+#include <net/ethernet.h>
+
+#include <net/pfvar.h>
+#include <net/if_pflog.h>
+
+#if NPFSYNC
+#include <net/if_pfsync.h>
+#endif /* NPFSYNC */
+
+#if INET6
+#include <netinet/ip6.h>
+#include <netinet6/in6_pcb.h>
+#include <netinet6/ip6_var.h>
+#include <netinet/icmp6.h>
+#include <netinet6/nd6.h>
+#endif /* INET6 */
+
+#ifndef NO_APPLE_EXTENSIONS
+#define DPFPRINTF(n, x) (pf_status.debug >= (n) ? printf x : ((void)0))
+#else
+#define DPFPRINTF(n, x) if (pf_status.debug >= (n)) printf x
+#endif
+
+/* XXX: should be in header somewhere */
+#define satosin(sa) ((struct sockaddr_in *)(sa))
+#define sintosa(sin) ((struct sockaddr *)(sin))
+
+/*
+ * On Mac OS X, the rtableid value is treated as the interface scope
+ * value that is equivalent to the interface index used for scoped
+ * routing. A valid scope value is anything but IFSCOPE_NONE (0),
+ * as per definition of ifindex which is a positive, non-zero number.
+ * The other BSDs treat a negative rtableid value as invalid, hence
+ * the test against INT_MAX to handle userland apps which initialize
+ * the field with a negative number.
+ */
+#define PF_RTABLEID_IS_VALID(r) \
+ ((r) > IFSCOPE_NONE && (r) <= INT_MAX)
+
+/*
+ * Global variables
+ */
+lck_mtx_t *pf_lock;
+lck_rw_t *pf_perim_lock;
+
+/* state tables */
+struct pf_state_tree_lan_ext pf_statetbl_lan_ext;
+struct pf_state_tree_ext_gwy pf_statetbl_ext_gwy;
+
+struct pf_palist pf_pabuf;
+struct pf_status pf_status;
+
+#if ALTQ
+struct pf_altqqueue pf_altqs[2];
+struct pf_altqqueue *pf_altqs_active;
+struct pf_altqqueue *pf_altqs_inactive;
+u_int32_t ticket_altqs_active;
+u_int32_t ticket_altqs_inactive;
+int altqs_inactive_open;
+#endif /* ALTQ */
+u_int32_t ticket_pabuf;
+
+static MD5_CTX pf_tcp_secret_ctx;
+static u_char pf_tcp_secret[16];
+static int pf_tcp_secret_init;
+static int pf_tcp_iss_off;
+
+static struct pf_anchor_stackframe {
+ struct pf_ruleset *rs;
+ struct pf_rule *r;
+ struct pf_anchor_node *parent;
+ struct pf_anchor *child;
+} pf_anchor_stack[64];
+
+struct pool pf_src_tree_pl, pf_rule_pl, pf_pooladdr_pl;
+struct pool pf_state_pl, pf_state_key_pl;
+#if ALTQ
+struct pool pf_altq_pl;
+#endif /* ALTQ */
+
+#ifndef NO_APPLE_EXTENSIONS
+typedef void (*hook_fn_t)(void *);
+
+struct hook_desc {
+ TAILQ_ENTRY(hook_desc) hd_list;
+ hook_fn_t hd_fn;
+ void *hd_arg;
+};
+
+#define HOOK_REMOVE 0x01
+#define HOOK_FREE 0x02
+#define HOOK_ABORT 0x04
+
+static void *hook_establish(struct hook_desc_head *, int,
+ hook_fn_t, void *);
+static void hook_runloop(struct hook_desc_head *, int flags);
+
+struct pool pf_app_state_pl;
+static void pf_print_addr(struct pf_addr *addr, sa_family_t af);
+static void pf_print_sk_host(struct pf_state_host *, u_int8_t, int,
+ u_int8_t);
+#endif
+
+static void pf_print_host(struct pf_addr *, u_int16_t, u_int8_t);
+
+static void pf_init_threshold(struct pf_threshold *, u_int32_t,
+ u_int32_t);
+static void pf_add_threshold(struct pf_threshold *);
+static int pf_check_threshold(struct pf_threshold *);
+
+static void pf_change_ap(int, struct mbuf *, struct pf_addr *,
+ u_int16_t *, u_int16_t *, u_int16_t *,
+ struct pf_addr *, u_int16_t, u_int8_t, sa_family_t);
+static int pf_modulate_sack(struct mbuf *, int, struct pf_pdesc *,
+ struct tcphdr *, struct pf_state_peer *);
+#if INET6
+static void pf_change_a6(struct pf_addr *, u_int16_t *,
+ struct pf_addr *, u_int8_t);
+#endif /* INET6 */
+static void pf_change_icmp(struct pf_addr *, u_int16_t *,
+ struct pf_addr *, struct pf_addr *, u_int16_t,
+ u_int16_t *, u_int16_t *, u_int16_t *,
+ u_int16_t *, u_int8_t, sa_family_t);
+static void pf_send_tcp(const struct pf_rule *, sa_family_t,
+ const struct pf_addr *, const struct pf_addr *,
+ u_int16_t, u_int16_t, u_int32_t, u_int32_t,
+ u_int8_t, u_int16_t, u_int16_t, u_int8_t, int,
+ u_int16_t, struct ether_header *, struct ifnet *);
+static void pf_send_icmp(struct mbuf *, u_int8_t, u_int8_t,
+ sa_family_t, struct pf_rule *);
+#ifndef NO_APPLE_EXTENSIONS
+static struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
+ int, int, struct pfi_kif *, struct pf_addr *,
+ union pf_state_xport *, struct pf_addr *,
+ union pf_state_xport *, int);
+static struct pf_rule *pf_get_translation_aux(struct pf_pdesc *,
+ struct mbuf *, int, int, struct pfi_kif *,
+ struct pf_src_node **, struct pf_addr *,
+ union pf_state_xport *, struct pf_addr *,
+ union pf_state_xport *, struct pf_addr *,
+ union pf_state_xport *);
+#else
+struct pf_rule *pf_match_translation(struct pf_pdesc *, struct mbuf *,
+ int, int, struct pfi_kif *,
+ struct pf_addr *, u_int16_t, struct pf_addr *,
+ u_int16_t, int);
+struct pf_rule *pf_get_translation(struct pf_pdesc *, struct mbuf *,
+ int, int, struct pfi_kif *, struct pf_src_node **,
+ struct pf_addr *, u_int16_t,
+ struct pf_addr *, u_int16_t,
+ struct pf_addr *, u_int16_t *);
+#endif
+static void pf_attach_state(struct pf_state_key *,
+ struct pf_state *, int);
+static void pf_detach_state(struct pf_state *, int);
+static u_int32_t pf_tcp_iss(struct pf_pdesc *);
+static int pf_test_rule(struct pf_rule **, struct pf_state **,
+ int, struct pfi_kif *, struct mbuf *, int,
+ void *, struct pf_pdesc *, struct pf_rule **,
+ struct pf_ruleset **, struct ifqueue *);
+static int pf_test_fragment(struct pf_rule **, int,
+ struct pfi_kif *, struct mbuf *, void *,
+ struct pf_pdesc *, struct pf_rule **,
+ struct pf_ruleset **);
+static int pf_test_state_tcp(struct pf_state **, int,
+ struct pfi_kif *, struct mbuf *, int,
+ void *, struct pf_pdesc *, u_short *);
+static int pf_test_state_udp(struct pf_state **, int,
+ struct pfi_kif *, struct mbuf *, int,
+ void *, struct pf_pdesc *);
+static int pf_test_state_icmp(struct pf_state **, int,
+ struct pfi_kif *, struct mbuf *, int,
+ void *, struct pf_pdesc *, u_short *);
+static int pf_test_state_other(struct pf_state **, int,
+ struct pfi_kif *, struct pf_pdesc *);
+static int pf_match_tag(struct mbuf *, struct pf_rule *,
+ struct pf_mtag *, int *);
+static void pf_step_into_anchor(int *, struct pf_ruleset **, int,
+ struct pf_rule **, struct pf_rule **, int *);
+static int pf_step_out_of_anchor(int *, struct pf_ruleset **,
+ int, struct pf_rule **, struct pf_rule **,
+ int *);
+static void pf_hash(struct pf_addr *, struct pf_addr *,
+ struct pf_poolhashkey *, sa_family_t);
+static int pf_map_addr(u_int8_t, struct pf_rule *,
+ struct pf_addr *, struct pf_addr *,
+ struct pf_addr *, struct pf_src_node **);
+#ifndef NO_APPLE_EXTENSIONS
+static int pf_get_sport(struct pf_pdesc *, struct pfi_kif *,
+ struct pf_rule *, struct pf_addr *,
+ union pf_state_xport *, struct pf_addr *,
+ union pf_state_xport *, struct pf_addr *,
+ union pf_state_xport *, struct pf_src_node **);
+#else
+int pf_get_sport(sa_family_t, u_int8_t, struct pf_rule *,
+ struct pf_addr *, struct pf_addr *, u_int16_t,
+ struct pf_addr *, u_int16_t *, u_int16_t, u_int16_t,
+ struct pf_src_node **);
+#endif
+static void pf_route(struct mbuf **, struct pf_rule *, int,
+ struct ifnet *, struct pf_state *,
+ struct pf_pdesc *);
+#if INET6
+static void pf_route6(struct mbuf **, struct pf_rule *, int,
+ struct ifnet *, struct pf_state *,
+ struct pf_pdesc *);
+#endif /* INET6 */
+static u_int8_t pf_get_wscale(struct mbuf *, int, u_int16_t,
+ sa_family_t);
+static u_int16_t pf_get_mss(struct mbuf *, int, u_int16_t,
+ sa_family_t);
+static u_int16_t pf_calc_mss(struct pf_addr *, sa_family_t,
+ u_int16_t);
+static void pf_set_rt_ifp(struct pf_state *,
+ struct pf_addr *);
+static int pf_check_proto_cksum(struct mbuf *, int, int,
+ u_int8_t, sa_family_t);
+static int pf_addr_wrap_neq(struct pf_addr_wrap *,
+ struct pf_addr_wrap *);
+static struct pf_state *pf_find_state(struct pfi_kif *,
+ struct pf_state_key_cmp *, u_int);
+static int pf_src_connlimit(struct pf_state **);
+static void pf_stateins_err(const char *, struct pf_state *,
+ struct pfi_kif *);
+static int pf_check_congestion(struct ifqueue *);
+
+#ifndef NO_APPLE_EXTENSIONS
+#if 0
+static const char *pf_pptp_ctrl_type_name(u_int16_t code);
+#endif
+static void pf_pptp_handler(struct pf_state *, int, int,
+ struct pf_pdesc *, struct pfi_kif *);
+static void pf_pptp_unlink(struct pf_state *);
+static int pf_test_state_grev1(struct pf_state **, int,
+ struct pfi_kif *, int, struct pf_pdesc *);
+static int pf_ike_compare(struct pf_app_state *,
+ struct pf_app_state *);
+static int pf_test_state_esp(struct pf_state **, int,
+ struct pfi_kif *, int, struct pf_pdesc *);
+#endif
+
+extern struct pool pfr_ktable_pl;
+extern struct pool pfr_kentry_pl;
+extern int path_mtu_discovery;
+
+struct pf_pool_limit pf_pool_limits[PF_LIMIT_MAX] = {
+ { &pf_state_pl, PFSTATE_HIWAT },
+ { &pf_app_state_pl, PFAPPSTATE_HIWAT },
+ { &pf_src_tree_pl, PFSNODE_HIWAT },
+ { &pf_frent_pl, PFFRAG_FRENT_HIWAT },
+ { &pfr_ktable_pl, PFR_KTABLE_HIWAT },
+ { &pfr_kentry_pl, PFR_KENTRY_HIWAT }
+};
+
+#ifndef NO_APPLE_EXTENSIONS
+struct mbuf *
+pf_lazy_makewritable(struct pf_pdesc *pd, struct mbuf *m, int len)
+{
+ if (pd->lmw < 0)
+ return (0);
+
+ VERIFY(m == pd->mp);
+
+ if (len > pd->lmw) {
+ if (m_makewritable(&m, 0, len, M_DONTWAIT))
+ len = -1;
+ pd->lmw = len;
+ if (len >= 0 && m != pd->mp) {
+ pd->mp = m;
+
+ switch (pd->af) {
+ case AF_INET: {
+ struct ip *h = mtod(m, struct ip *);
+ pd->src = (struct pf_addr *)&h->ip_src;
+ pd->dst = (struct pf_addr *)&h->ip_dst;
+ pd->ip_sum = &h->ip_sum;
+ break;
+ }
+#if INET6
+ case AF_INET6: {
+ struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
+ pd->src = (struct pf_addr *)&h->ip6_src;
+ pd->dst = (struct pf_addr *)&h->ip6_dst;
+ break;
+ }
+#endif /* INET6 */
+ }
+ }
+ }
+
+ return (len < 0 ? 0 : m);
+}
+
+static const int *
+pf_state_lookup_aux(struct pf_state **state, struct pfi_kif *kif,
+ int direction, int *action)
+{
+ if (*state == NULL || (*state)->timeout == PFTM_PURGE) {
+ *action = PF_DROP;
+ return (action);
+ }
+
+ if (direction == PF_OUT &&
+ (((*state)->rule.ptr->rt == PF_ROUTETO &&
+ (*state)->rule.ptr->direction == PF_OUT) ||
+ ((*state)->rule.ptr->rt == PF_REPLYTO &&
+ (*state)->rule.ptr->direction == PF_IN)) &&
+ (*state)->rt_kif != NULL && (*state)->rt_kif != kif) {
+ *action = PF_PASS;
+ return (action);
+ }
+
+ return (0);
+}
+
+#define STATE_LOOKUP() \
+ do { \
+ int action; \
+ *state = pf_find_state(kif, &key, direction); \
+ if (pf_state_lookup_aux(state, kif, direction, &action)) \
+ return (action); \
+ } while (0)
+
+#define STATE_ADDR_TRANSLATE(sk) \
+ (sk)->lan.addr.addr32[0] != (sk)->gwy.addr.addr32[0] || \
+ ((sk)->af == AF_INET6 && \
+ ((sk)->lan.addr.addr32[1] != (sk)->gwy.addr.addr32[1] || \
+ (sk)->lan.addr.addr32[2] != (sk)->gwy.addr.addr32[2] || \
+ (sk)->lan.addr.addr32[3] != (sk)->gwy.addr.addr32[3]))
+
+#define STATE_TRANSLATE(sk) \
+ (STATE_ADDR_TRANSLATE(sk) || \
+ (sk)->lan.xport.port != (sk)->gwy.xport.port)
+
+#define STATE_GRE_TRANSLATE(sk) \
+ (STATE_ADDR_TRANSLATE(sk) || \
+ (sk)->lan.xport.call_id != (sk)->gwy.xport.call_id)
+
+#else
+#define STATE_LOOKUP() \
+ do { \
+ *state = pf_find_state(kif, &key, direction); \
+ if (*state == NULL || (*state)->timeout == PFTM_PURGE) \
+ return (PF_DROP); \
+ if (direction == PF_OUT && \
+ (((*state)->rule.ptr->rt == PF_ROUTETO && \
+ (*state)->rule.ptr->direction == PF_OUT) || \
+ ((*state)->rule.ptr->rt == PF_REPLYTO && \
+ (*state)->rule.ptr->direction == PF_IN)) && \
+ (*state)->rt_kif != NULL && \
+ (*state)->rt_kif != kif) \
+ return (PF_PASS); \
+ } while (0)
+
+#define STATE_TRANSLATE(sk) \
+ (sk)->lan.addr.addr32[0] != (sk)->gwy.addr.addr32[0] || \
+ ((sk)->af == AF_INET6 && \
+ ((sk)->lan.addr.addr32[1] != (sk)->gwy.addr.addr32[1] || \
+ (sk)->lan.addr.addr32[2] != (sk)->gwy.addr.addr32[2] || \
+ (sk)->lan.addr.addr32[3] != (sk)->gwy.addr.addr32[3])) || \
+ (sk)->lan.port != (sk)->gwy.port
+#endif
+
+#define BOUND_IFACE(r, k) \
+ ((r)->rule_flag & PFRULE_IFBOUND) ? (k) : pfi_all
+
+#define STATE_INC_COUNTERS(s) \
+ do { \
+ s->rule.ptr->states++; \
+ if (s->anchor.ptr != NULL) \
+ s->anchor.ptr->states++; \
+ if (s->nat_rule.ptr != NULL) \
+ s->nat_rule.ptr->states++; \
+ } while (0)
+
+#define STATE_DEC_COUNTERS(s) \
+ do { \
+ if (s->nat_rule.ptr != NULL) \
+ s->nat_rule.ptr->states--; \
+ if (s->anchor.ptr != NULL) \
+ s->anchor.ptr->states--; \
+ s->rule.ptr->states--; \
+ } while (0)
+
+static __inline int pf_src_compare(struct pf_src_node *, struct pf_src_node *);
+static __inline int pf_state_compare_lan_ext(struct pf_state_key *,
+ struct pf_state_key *);
+static __inline int pf_state_compare_ext_gwy(struct pf_state_key *,
+ struct pf_state_key *);
+static __inline int pf_state_compare_id(struct pf_state *,
+ struct pf_state *);
+
+struct pf_src_tree tree_src_tracking;
+
+struct pf_state_tree_id tree_id;
+struct pf_state_queue state_list;
+
+RB_GENERATE(pf_src_tree, pf_src_node, entry, pf_src_compare);
+RB_GENERATE(pf_state_tree_lan_ext, pf_state_key,
+ entry_lan_ext, pf_state_compare_lan_ext);
+RB_GENERATE(pf_state_tree_ext_gwy, pf_state_key,
+ entry_ext_gwy, pf_state_compare_ext_gwy);
+RB_GENERATE(pf_state_tree_id, pf_state,
+ entry_id, pf_state_compare_id);
+
+#define PF_DT_SKIP_LANEXT 0x01
+#define PF_DT_SKIP_EXTGWY 0x02
+
+#ifndef NO_APPLE_EXTENSIONS
+static const u_int16_t PF_PPTP_PORT = htons(1723);
+static const u_int32_t PF_PPTP_MAGIC_NUMBER = htonl(0x1A2B3C4D);
+
+struct pf_pptp_hdr {
+ u_int16_t length;
+ u_int16_t type;
+ u_int32_t magic;
+};
+
+struct pf_pptp_ctrl_hdr {
+ u_int16_t type;
+ u_int16_t reserved_0;
+};
+
+struct pf_pptp_ctrl_generic {
+ u_int16_t data[0];
+};
+
+#define PF_PPTP_CTRL_TYPE_START_REQ 1
+struct pf_pptp_ctrl_start_req {
+ u_int16_t protocol_version;
+ u_int16_t reserved_1;
+ u_int32_t framing_capabilities;
+ u_int32_t bearer_capabilities;
+ u_int16_t maximum_channels;
+ u_int16_t firmware_revision;
+ u_int8_t host_name[64];
+ u_int8_t vendor_string[64];
+};
+
+#define PF_PPTP_CTRL_TYPE_START_RPY 2
+struct pf_pptp_ctrl_start_rpy {
+ u_int16_t protocol_version;
+ u_int8_t result_code;
+ u_int8_t error_code;
+ u_int32_t framing_capabilities;
+ u_int32_t bearer_capabilities;
+ u_int16_t maximum_channels;
+ u_int16_t firmware_revision;
+ u_int8_t host_name[64];
+ u_int8_t vendor_string[64];
+};
+
+#define PF_PPTP_CTRL_TYPE_STOP_REQ 3
+struct pf_pptp_ctrl_stop_req {
+ u_int8_t reason;
+ u_int8_t reserved_1;
+ u_int16_t reserved_2;
+};
+
+#define PF_PPTP_CTRL_TYPE_STOP_RPY 4
+struct pf_pptp_ctrl_stop_rpy {
+ u_int8_t reason;
+ u_int8_t error_code;
+ u_int16_t reserved_1;
+};
+
+#define PF_PPTP_CTRL_TYPE_ECHO_REQ 5
+struct pf_pptp_ctrl_echo_req {
+ u_int32_t identifier;
+};
+
+#define PF_PPTP_CTRL_TYPE_ECHO_RPY 6
+struct pf_pptp_ctrl_echo_rpy {
+ u_int32_t identifier;
+ u_int8_t result_code;
+ u_int8_t error_code;
+ u_int16_t reserved_1;
+};
+
+#define PF_PPTP_CTRL_TYPE_CALL_OUT_REQ 7
+struct pf_pptp_ctrl_call_out_req {
+ u_int16_t call_id;
+ u_int16_t call_sernum;
+ u_int32_t min_bps;
+ u_int32_t bearer_type;
+ u_int32_t framing_type;
+ u_int16_t rxwindow_size;
+ u_int16_t proc_delay;
+ u_int8_t phone_num[64];
+ u_int8_t sub_addr[64];
+};
+
+#define PF_PPTP_CTRL_TYPE_CALL_OUT_RPY 8
+struct pf_pptp_ctrl_call_out_rpy {
+ u_int16_t call_id;
+ u_int16_t peer_call_id;
+ u_int8_t result_code;
+ u_int8_t error_code;
+ u_int16_t cause_code;
+ u_int32_t connect_speed;
+ u_int16_t rxwindow_size;
+ u_int16_t proc_delay;
+ u_int32_t phy_channel_id;
+};
+
+#define PF_PPTP_CTRL_TYPE_CALL_IN_1ST 9
+struct pf_pptp_ctrl_call_in_1st {
+ u_int16_t call_id;
+ u_int16_t call_sernum;
+ u_int32_t bearer_type;
+ u_int32_t phy_channel_id;
+ u_int16_t dialed_number_len;
+ u_int16_t dialing_number_len;
+ u_int8_t dialed_num[64];
+ u_int8_t dialing_num[64];
+ u_int8_t sub_addr[64];
+};
+
+#define PF_PPTP_CTRL_TYPE_CALL_IN_2ND 10
+struct pf_pptp_ctrl_call_in_2nd {
+ u_int16_t call_id;
+ u_int16_t peer_call_id;
+ u_int8_t result_code;
+ u_int8_t error_code;
+ u_int16_t rxwindow_size;
+ u_int16_t txdelay;
+ u_int16_t reserved_1;
+};
+
+#define PF_PPTP_CTRL_TYPE_CALL_IN_3RD 11
+struct pf_pptp_ctrl_call_in_3rd {
+ u_int16_t call_id;
+ u_int16_t reserved_1;
+ u_int32_t connect_speed;
+ u_int16_t rxwindow_size;
+ u_int16_t txdelay;
+ u_int32_t framing_type;
+};
+
+#define PF_PPTP_CTRL_TYPE_CALL_CLR 12
+struct pf_pptp_ctrl_call_clr {
+ u_int16_t call_id;
+ u_int16_t reserved_1;
+};
+
+#define PF_PPTP_CTRL_TYPE_CALL_DISC 13
+struct pf_pptp_ctrl_call_disc {
+ u_int16_t call_id;
+ u_int8_t result_code;
+ u_int8_t error_code;
+ u_int16_t cause_code;
+ u_int16_t reserved_1;
+ u_int8_t statistics[128];
+};
+
+#define PF_PPTP_CTRL_TYPE_ERROR 14
+struct pf_pptp_ctrl_error {
+ u_int16_t peer_call_id;
+ u_int16_t reserved_1;
+ u_int32_t crc_errors;
+ u_int32_t fr_errors;
+ u_int32_t hw_errors;
+ u_int32_t buf_errors;
+ u_int32_t tim_errors;
+ u_int32_t align_errors;
+};
+
+#define PF_PPTP_CTRL_TYPE_SET_LINKINFO 15
+struct pf_pptp_ctrl_set_linkinfo {
+ u_int16_t peer_call_id;
+ u_int16_t reserved_1;
+ u_int32_t tx_accm;
+ u_int32_t rx_accm;
+};
+
+#if 0
+static const char *pf_pptp_ctrl_type_name(u_int16_t code)
+{
+ code = ntohs(code);
+
+ if (code < PF_PPTP_CTRL_TYPE_START_REQ ||
+ code > PF_PPTP_CTRL_TYPE_SET_LINKINFO) {
+ static char reserved[] = "reserved-00";
+
+ sprintf(&reserved[9], "%02x", code);
+ return (reserved);
+ } else {
+ static const char *name[] = {
+ "start_req", "start_rpy", "stop_req", "stop_rpy",
+ "echo_req", "echo_rpy", "call_out_req", "call_out_rpy",
+ "call_in_1st", "call_in_2nd", "call_in_3rd",
+ "call_clr", "call_disc", "error", "set_linkinfo"
+ };
+
+ return (name[code - 1]);
+ }
+};
+#endif
+
+static const size_t PF_PPTP_CTRL_MSG_MINSIZE =
+ sizeof (struct pf_pptp_hdr) +
+ sizeof (struct pf_pptp_ctrl_hdr) +
+ MIN(sizeof (struct pf_pptp_ctrl_start_req),
+ MIN(sizeof (struct pf_pptp_ctrl_start_rpy),
+ MIN(sizeof (struct pf_pptp_ctrl_stop_req),
+ MIN(sizeof (struct pf_pptp_ctrl_stop_rpy),
+ MIN(sizeof (struct pf_pptp_ctrl_echo_req),
+ MIN(sizeof (struct pf_pptp_ctrl_echo_rpy),
+ MIN(sizeof (struct pf_pptp_ctrl_call_out_req),
+ MIN(sizeof (struct pf_pptp_ctrl_call_out_rpy),
+ MIN(sizeof (struct pf_pptp_ctrl_call_in_1st),
+ MIN(sizeof (struct pf_pptp_ctrl_call_in_2nd),
+ MIN(sizeof (struct pf_pptp_ctrl_call_in_3rd),
+ MIN(sizeof (struct pf_pptp_ctrl_call_clr),
+ MIN(sizeof (struct pf_pptp_ctrl_call_disc),
+ MIN(sizeof (struct pf_pptp_ctrl_error),
+ sizeof (struct pf_pptp_ctrl_set_linkinfo)
+ ))))))))))))));
+
+union pf_pptp_ctrl_msg_union {
+ struct pf_pptp_ctrl_start_req start_req;
+ struct pf_pptp_ctrl_start_rpy start_rpy;
+ struct pf_pptp_ctrl_stop_req stop_req;
+ struct pf_pptp_ctrl_stop_rpy stop_rpy;
+ struct pf_pptp_ctrl_echo_req echo_req;
+ struct pf_pptp_ctrl_echo_rpy echo_rpy;
+ struct pf_pptp_ctrl_call_out_req call_out_req;
+ struct pf_pptp_ctrl_call_out_rpy call_out_rpy;
+ struct pf_pptp_ctrl_call_in_1st call_in_1st;
+ struct pf_pptp_ctrl_call_in_2nd call_in_2nd;
+ struct pf_pptp_ctrl_call_in_3rd call_in_3rd;
+ struct pf_pptp_ctrl_call_clr call_clr;
+ struct pf_pptp_ctrl_call_disc call_disc;
+ struct pf_pptp_ctrl_error error;
+ struct pf_pptp_ctrl_set_linkinfo set_linkinfo;
+ u_int8_t data[0];
+};
+
+struct pf_pptp_ctrl_msg {
+ struct pf_pptp_hdr hdr;
+ struct pf_pptp_ctrl_hdr ctrl;
+ union pf_pptp_ctrl_msg_union msg;
+};
+
+#define PF_GRE_FLAG_CHECKSUM_PRESENT 0x8000
+#define PF_GRE_FLAG_VERSION_MASK 0x0007
+#define PF_GRE_PPP_ETHERTYPE 0x880B
+
+struct pf_grev1_hdr {
+ u_int16_t flags;
+ u_int16_t protocol_type;
+ u_int16_t payload_length;
+ u_int16_t call_id;
+ /*
+ u_int32_t seqno;
+ u_int32_t ackno;
+ */
+};
+
+static const u_int16_t PF_IKE_PORT = htons(500);
+
+struct pf_ike_hdr {
+ u_int64_t initiator_cookie, responder_cookie;
+ u_int8_t next_payload, version, exchange_type, flags;
+ u_int32_t message_id, length;
+};
+
+#define PF_IKE_PACKET_MINSIZE (sizeof (struct pf_ike_hdr))
+
+#define PF_IKEv1_EXCHTYPE_BASE 1
+#define PF_IKEv1_EXCHTYPE_ID_PROTECT 2
+#define PF_IKEv1_EXCHTYPE_AUTH_ONLY 3
+#define PF_IKEv1_EXCHTYPE_AGGRESSIVE 4
+#define PF_IKEv1_EXCHTYPE_INFORMATIONAL 5
+#define PF_IKEv2_EXCHTYPE_SA_INIT 34
+#define PF_IKEv2_EXCHTYPE_AUTH 35
+#define PF_IKEv2_EXCHTYPE_CREATE_CHILD_SA 36
+#define PF_IKEv2_EXCHTYPE_INFORMATIONAL 37
+
+#define PF_IKEv1_FLAG_E 0x01
+#define PF_IKEv1_FLAG_C 0x02
+#define PF_IKEv1_FLAG_A 0x04
+#define PF_IKEv2_FLAG_I 0x08
+#define PF_IKEv2_FLAG_V 0x10
+#define PF_IKEv2_FLAG_R 0x20
+
+struct pf_esp_hdr {
+ u_int32_t spi;
+ u_int32_t seqno;
+ u_int8_t payload[];
+};
+#endif
+
+static __inline int
+pf_src_compare(struct pf_src_node *a, struct pf_src_node *b)
+{
+ int diff;
+
+ if (a->rule.ptr > b->rule.ptr)
+ return (1);
+ if (a->rule.ptr < b->rule.ptr)
+ return (-1);
+ if ((diff = a->af - b->af) != 0)
+ return (diff);
+ switch (a->af) {
+#if INET
+ case AF_INET:
+ if (a->addr.addr32[0] > b->addr.addr32[0])
+ return (1);
+ if (a->addr.addr32[0] < b->addr.addr32[0])
+ return (-1);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (a->addr.addr32[3] > b->addr.addr32[3])
+ return (1);
+ if (a->addr.addr32[3] < b->addr.addr32[3])
+ return (-1);
+ if (a->addr.addr32[2] > b->addr.addr32[2])
+ return (1);
+ if (a->addr.addr32[2] < b->addr.addr32[2])
+ return (-1);
+ if (a->addr.addr32[1] > b->addr.addr32[1])
+ return (1);
+ if (a->addr.addr32[1] < b->addr.addr32[1])
+ return (-1);
+ if (a->addr.addr32[0] > b->addr.addr32[0])
+ return (1);
+ if (a->addr.addr32[0] < b->addr.addr32[0])
+ return (-1);
+ break;
+#endif /* INET6 */
+ }
+ return (0);
+}
+
+static __inline int
+pf_state_compare_lan_ext(struct pf_state_key *a, struct pf_state_key *b)
+{
+ int diff;
+#ifndef NO_APPLE_EXTENSIONS
+ int extfilter;
+#endif
+
+ if ((diff = a->proto - b->proto) != 0)
+ return (diff);
+ if ((diff = a->af - b->af) != 0)
+ return (diff);
+
+#ifndef NO_APPLE_EXTENSIONS
+ extfilter = PF_EXTFILTER_APD;
+
+ switch (a->proto) {
+ case IPPROTO_ICMP:
+ case IPPROTO_ICMPV6:
+ if ((diff = a->lan.xport.port - b->lan.xport.port) != 0)
+ return (diff);
+ break;
+
+ case IPPROTO_TCP:
+ if ((diff = a->lan.xport.port - b->lan.xport.port) != 0)
+ return (diff);
+ if ((diff = a->ext.xport.port - b->ext.xport.port) != 0)
+ return (diff);
+ break;
+
+ case IPPROTO_UDP:
+ if ((diff = a->proto_variant - b->proto_variant))
+ return (diff);
+ extfilter = a->proto_variant;
+ if ((diff = a->lan.xport.port - b->lan.xport.port) != 0)
+ return (diff);
+ if ((extfilter < PF_EXTFILTER_AD) &&
+ (diff = a->ext.xport.port - b->ext.xport.port) != 0)
+ return (diff);
+ break;
+
+ case IPPROTO_GRE:
+ if (a->proto_variant == PF_GRE_PPTP_VARIANT &&
+ a->proto_variant == b->proto_variant) {
+ if (!!(diff = a->ext.xport.call_id -
+ b->ext.xport.call_id))
+ return (diff);
+ }
+ break;
+
+ case IPPROTO_ESP:
+ if (!!(diff = a->ext.xport.spi - b->ext.xport.spi))
+ return (diff);
+ break;
+
+ default:
+ break;
+ }
+#endif
+
+ switch (a->af) {
+#if INET
+ case AF_INET:
+ if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
+ return (1);
+ if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
+ return (-1);
+#ifndef NO_APPLE_EXTENSIONS
+ if (extfilter < PF_EXTFILTER_EI) {
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+ }
+#else
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+#endif
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+#ifndef NO_APPLE_EXTENSIONS
+ if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
+ return (1);
+ if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
+ return (-1);
+ if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
+ return (1);
+ if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
+ return (-1);
+ if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
+ return (1);
+ if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
+ return (-1);
+ if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
+ return (1);
+ if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
+ return (-1);
+ if (extfilter < PF_EXTFILTER_EI ||
+ !PF_AZERO(&b->ext.addr, AF_INET6)) {
+ if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
+ return (1);
+ if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
+ return (-1);
+ if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
+ return (1);
+ if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
+ return (-1);
+ if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
+ return (1);
+ if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
+ return (-1);
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+ }
+#else
+ if (a->lan.addr.addr32[3] > b->lan.addr.addr32[3])
+ return (1);
+ if (a->lan.addr.addr32[3] < b->lan.addr.addr32[3])
+ return (-1);
+ if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
+ return (1);
+ if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
+ return (-1);
+ if (a->lan.addr.addr32[2] > b->lan.addr.addr32[2])
+ return (1);
+ if (a->lan.addr.addr32[2] < b->lan.addr.addr32[2])
+ return (-1);
+ if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
+ return (1);
+ if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
+ return (-1);
+ if (a->lan.addr.addr32[1] > b->lan.addr.addr32[1])
+ return (1);
+ if (a->lan.addr.addr32[1] < b->lan.addr.addr32[1])
+ return (-1);
+ if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
+ return (1);
+ if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
+ return (-1);
+ if (a->lan.addr.addr32[0] > b->lan.addr.addr32[0])
+ return (1);
+ if (a->lan.addr.addr32[0] < b->lan.addr.addr32[0])
+ return (-1);
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+#endif
+ break;
+#endif /* INET6 */
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (a->app_state && b->app_state) {
+ if (a->app_state->compare_lan_ext &&
+ b->app_state->compare_lan_ext) {
+ diff = (const char *)b->app_state->compare_lan_ext -
+ (const char *)a->app_state->compare_lan_ext;
+ if (diff != 0)
+ return (diff);
+ diff = a->app_state->compare_lan_ext(a->app_state,
+ b->app_state);
+ if (diff != 0)
+ return (diff);
+ }
+ }
+#else
+ if ((diff = a->lan.port - b->lan.port) != 0)
+ return (diff);
+ if ((diff = a->ext.port - b->ext.port) != 0)
+ return (diff);
+#endif
+
+ return (0);
+}
+
+static __inline int
+pf_state_compare_ext_gwy(struct pf_state_key *a, struct pf_state_key *b)
+{
+ int diff;
+#ifndef NO_APPLE_EXTENSIONS
+ int extfilter;
+#endif
+
+ if ((diff = a->proto - b->proto) != 0)
+ return (diff);
+
+ if ((diff = a->af - b->af) != 0)
+ return (diff);
+
+#ifndef NO_APPLE_EXTENSIONS
+ extfilter = PF_EXTFILTER_APD;
+
+ switch (a->proto) {
+ case IPPROTO_ICMP:
+ case IPPROTO_ICMPV6:
+ if ((diff = a->gwy.xport.port - b->gwy.xport.port) != 0)
+ return (diff);
+ break;
+
+ case IPPROTO_TCP:
+ if ((diff = a->ext.xport.port - b->ext.xport.port) != 0)
+ return (diff);
+ if ((diff = a->gwy.xport.port - b->gwy.xport.port) != 0)
+ return (diff);
+ break;
+
+ case IPPROTO_UDP:
+ if ((diff = a->proto_variant - b->proto_variant))
+ return (diff);
+ extfilter = a->proto_variant;
+ if ((diff = a->gwy.xport.port - b->gwy.xport.port) != 0)
+ return (diff);
+ if ((extfilter < PF_EXTFILTER_AD) &&
+ (diff = a->ext.xport.port - b->ext.xport.port) != 0)
+ return (diff);
+ break;
+
+ case IPPROTO_GRE:
+ if (a->proto_variant == PF_GRE_PPTP_VARIANT &&
+ a->proto_variant == b->proto_variant) {
+ if (!!(diff = a->gwy.xport.call_id -
+ b->gwy.xport.call_id))
+ return (diff);
+ }
+ break;
+
+ case IPPROTO_ESP:
+ if (!!(diff = a->gwy.xport.spi - b->gwy.xport.spi))
+ return (diff);
+ break;
+
+ default:
+ break;
+ }
+#endif
+
+ switch (a->af) {
+#if INET
+ case AF_INET:
+#ifndef NO_APPLE_EXTENSIONS
+ if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
+ return (1);
+ if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
+ return (-1);
+ if (extfilter < PF_EXTFILTER_EI) {
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+ }
+#else
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+ if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
+ return (1);
+ if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
+ return (-1);
+#endif
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+#ifndef NO_APPLE_EXTENSIONS
+ if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
+ return (1);
+ if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
+ return (-1);
+ if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
+ return (1);
+ if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
+ return (-1);
+ if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
+ return (1);
+ if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
+ return (-1);
+ if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
+ return (1);
+ if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
+ return (-1);
+ if (extfilter < PF_EXTFILTER_EI ||
+ !PF_AZERO(&b->ext.addr, AF_INET6)) {
+ if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
+ return (1);
+ if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
+ return (-1);
+ if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
+ return (1);
+ if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
+ return (-1);
+ if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
+ return (1);
+ if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
+ return (-1);
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+ }
+#else
+ if (a->ext.addr.addr32[3] > b->ext.addr.addr32[3])
+ return (1);
+ if (a->ext.addr.addr32[3] < b->ext.addr.addr32[3])
+ return (-1);
+ if (a->gwy.addr.addr32[3] > b->gwy.addr.addr32[3])
+ return (1);
+ if (a->gwy.addr.addr32[3] < b->gwy.addr.addr32[3])
+ return (-1);
+ if (a->ext.addr.addr32[2] > b->ext.addr.addr32[2])
+ return (1);
+ if (a->ext.addr.addr32[2] < b->ext.addr.addr32[2])
+ return (-1);
+ if (a->gwy.addr.addr32[2] > b->gwy.addr.addr32[2])
+ return (1);
+ if (a->gwy.addr.addr32[2] < b->gwy.addr.addr32[2])
+ return (-1);
+ if (a->ext.addr.addr32[1] > b->ext.addr.addr32[1])
+ return (1);
+ if (a->ext.addr.addr32[1] < b->ext.addr.addr32[1])
+ return (-1);
+ if (a->gwy.addr.addr32[1] > b->gwy.addr.addr32[1])
+ return (1);
+ if (a->gwy.addr.addr32[1] < b->gwy.addr.addr32[1])
+ return (-1);
+ if (a->ext.addr.addr32[0] > b->ext.addr.addr32[0])
+ return (1);
+ if (a->ext.addr.addr32[0] < b->ext.addr.addr32[0])
+ return (-1);
+ if (a->gwy.addr.addr32[0] > b->gwy.addr.addr32[0])
+ return (1);
+ if (a->gwy.addr.addr32[0] < b->gwy.addr.addr32[0])
+ return (-1);
+#endif
+ break;
+#endif /* INET6 */
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (a->app_state && b->app_state) {
+ if (a->app_state->compare_ext_gwy &&
+ b->app_state->compare_ext_gwy) {
+ diff = (const char *)b->app_state->compare_ext_gwy -
+ (const char *)a->app_state->compare_ext_gwy;
+ if (diff != 0)
+ return (diff);
+ diff = a->app_state->compare_ext_gwy(a->app_state,
+ b->app_state);
+ if (diff != 0)
+ return (diff);
+ }
+ }
+#else
+ if ((diff = a->ext.port - b->ext.port) != 0)
+ return (diff);
+ if ((diff = a->gwy.port - b->gwy.port) != 0)
+ return (diff);
+#endif
+
+ return (0);
+}
+
+static __inline int
+pf_state_compare_id(struct pf_state *a, struct pf_state *b)
+{
+ if (a->id > b->id)
+ return (1);
+ if (a->id < b->id)
+ return (-1);
+ if (a->creatorid > b->creatorid)
+ return (1);
+ if (a->creatorid < b->creatorid)
+ return (-1);
+
+ return (0);
+}
+
+#if INET6
+void
+pf_addrcpy(struct pf_addr *dst, struct pf_addr *src, sa_family_t af)
+{
+ switch (af) {
+#if INET
+ case AF_INET:
+ dst->addr32[0] = src->addr32[0];
+ break;
+#endif /* INET */
+ case AF_INET6:
+ dst->addr32[0] = src->addr32[0];
+ dst->addr32[1] = src->addr32[1];
+ dst->addr32[2] = src->addr32[2];
+ dst->addr32[3] = src->addr32[3];
+ break;
+ }
+}
+#endif /* INET6 */
+
+struct pf_state *
+pf_find_state_byid(struct pf_state_cmp *key)
+{
+ pf_status.fcounters[FCNT_STATE_SEARCH]++;
+
+ return (RB_FIND(pf_state_tree_id, &tree_id, (struct pf_state *)key));
+}
+
+static struct pf_state *
+pf_find_state(struct pfi_kif *kif, struct pf_state_key_cmp *key, u_int dir)
+{
+ struct pf_state_key *sk = NULL;
+ struct pf_state *s;
+
+ pf_status.fcounters[FCNT_STATE_SEARCH]++;
+
+ switch (dir) {
+ case PF_OUT:
+ sk = RB_FIND(pf_state_tree_lan_ext, &pf_statetbl_lan_ext,
+ (struct pf_state_key *)key);
+ break;
+ case PF_IN:
+ sk = RB_FIND(pf_state_tree_ext_gwy, &pf_statetbl_ext_gwy,
+ (struct pf_state_key *)key);
+ break;
+ default:
+ panic("pf_find_state");
+ }
+
+ /* list is sorted, if-bound states before floating ones */
+ if (sk != NULL)
+ TAILQ_FOREACH(s, &sk->states, next)
+ if (s->kif == pfi_all || s->kif == kif)
+ return (s);
+
+ return (NULL);
+}
+
+struct pf_state *
+pf_find_state_all(struct pf_state_key_cmp *key, u_int dir, int *more)
+{
+ struct pf_state_key *sk = NULL;
+ struct pf_state *s, *ret = NULL;
+
+ pf_status.fcounters[FCNT_STATE_SEARCH]++;
+
+ switch (dir) {
+ case PF_OUT:
+ sk = RB_FIND(pf_state_tree_lan_ext,
+ &pf_statetbl_lan_ext, (struct pf_state_key *)key);
+ break;
+ case PF_IN:
+ sk = RB_FIND(pf_state_tree_ext_gwy,
+ &pf_statetbl_ext_gwy, (struct pf_state_key *)key);
+ break;
+ default:
+ panic("pf_find_state_all");
+ }
+
+ if (sk != NULL) {
+ ret = TAILQ_FIRST(&sk->states);
+ if (more == NULL)
+ return (ret);
+
+ TAILQ_FOREACH(s, &sk->states, next)
+ (*more)++;
+ }
+
+ return (ret);
+}
+
+static void
+pf_init_threshold(struct pf_threshold *threshold,
+ u_int32_t limit, u_int32_t seconds)
+{
+ threshold->limit = limit * PF_THRESHOLD_MULT;
+ threshold->seconds = seconds;
+ threshold->count = 0;
+ threshold->last = pf_time_second();
+}
+
+static void
+pf_add_threshold(struct pf_threshold *threshold)
+{
+ u_int32_t t = pf_time_second(), diff = t - threshold->last;
+
+ if (diff >= threshold->seconds)
+ threshold->count = 0;
+ else
+ threshold->count -= threshold->count * diff /
+ threshold->seconds;
+ threshold->count += PF_THRESHOLD_MULT;
+ threshold->last = t;
+}
+
+static int
+pf_check_threshold(struct pf_threshold *threshold)
+{
+ return (threshold->count > threshold->limit);
+}
+
+static int
+pf_src_connlimit(struct pf_state **state)
+{
+ int bad = 0;
+
+ (*state)->src_node->conn++;
+ (*state)->src.tcp_est = 1;
+ pf_add_threshold(&(*state)->src_node->conn_rate);
+
+ if ((*state)->rule.ptr->max_src_conn &&
+ (*state)->rule.ptr->max_src_conn <
+ (*state)->src_node->conn) {
+ pf_status.lcounters[LCNT_SRCCONN]++;
+ bad++;
+ }
+
+ if ((*state)->rule.ptr->max_src_conn_rate.limit &&
+ pf_check_threshold(&(*state)->src_node->conn_rate)) {
+ pf_status.lcounters[LCNT_SRCCONNRATE]++;
+ bad++;
+ }
+
+ if (!bad)
+ return (0);
+
+ if ((*state)->rule.ptr->overload_tbl) {
+ struct pfr_addr p;
+ u_int32_t killed = 0;
+
+ pf_status.lcounters[LCNT_OVERLOAD_TABLE]++;
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf_src_connlimit: blocking address ");
+ pf_print_host(&(*state)->src_node->addr, 0,
+ (*state)->state_key->af);
+ }
+
+ bzero(&p, sizeof (p));
+ p.pfra_af = (*state)->state_key->af;
+ switch ((*state)->state_key->af) {
+#if INET
+ case AF_INET:
+ p.pfra_net = 32;
+ p.pfra_ip4addr = (*state)->src_node->addr.v4;
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ p.pfra_net = 128;
+ p.pfra_ip6addr = (*state)->src_node->addr.v6;
+ break;
+#endif /* INET6 */
+ }
+
+ pfr_insert_kentry((*state)->rule.ptr->overload_tbl,
+ &p, pf_time_second());
+
+ /* kill existing states if that's required. */
+ if ((*state)->rule.ptr->flush) {
+ struct pf_state_key *sk;
+ struct pf_state *st;
+
+ pf_status.lcounters[LCNT_OVERLOAD_FLUSH]++;
+ RB_FOREACH(st, pf_state_tree_id, &tree_id) {
+ sk = st->state_key;
+ /*
+ * Kill states from this source. (Only those
+ * from the same rule if PF_FLUSH_GLOBAL is not
+ * set)
+ */
+ if (sk->af ==
+ (*state)->state_key->af &&
+ (((*state)->state_key->direction ==
+ PF_OUT &&
+ PF_AEQ(&(*state)->src_node->addr,
+ &sk->lan.addr, sk->af)) ||
+ ((*state)->state_key->direction == PF_IN &&
+ PF_AEQ(&(*state)->src_node->addr,
+ &sk->ext.addr, sk->af))) &&
+ ((*state)->rule.ptr->flush &
+ PF_FLUSH_GLOBAL ||
+ (*state)->rule.ptr == st->rule.ptr)) {
+ st->timeout = PFTM_PURGE;
+ st->src.state = st->dst.state =
+ TCPS_CLOSED;
+ killed++;
+ }
+ }
+ if (pf_status.debug >= PF_DEBUG_MISC)
+ printf(", %u states killed", killed);
+ }
+ if (pf_status.debug >= PF_DEBUG_MISC)
+ printf("\n");
+ }
+
+ /* kill this state */
+ (*state)->timeout = PFTM_PURGE;
+ (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
+ return (1);
+}
+
+int
+pf_insert_src_node(struct pf_src_node **sn, struct pf_rule *rule,
+ struct pf_addr *src, sa_family_t af)
+{
+ struct pf_src_node k;
+
+ if (*sn == NULL) {
+ k.af = af;
+ PF_ACPY(&k.addr, src, af);
+ if (rule->rule_flag & PFRULE_RULESRCTRACK ||
+ rule->rpool.opts & PF_POOL_STICKYADDR)
+ k.rule.ptr = rule;
+ else
+ k.rule.ptr = NULL;
+ pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
+ *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
+ }
+ if (*sn == NULL) {
+ if (!rule->max_src_nodes ||
+ rule->src_nodes < rule->max_src_nodes)
+ (*sn) = pool_get(&pf_src_tree_pl, PR_WAITOK);
+ else
+ pf_status.lcounters[LCNT_SRCNODES]++;
+ if ((*sn) == NULL)
+ return (-1);
+ bzero(*sn, sizeof (struct pf_src_node));
+
+ pf_init_threshold(&(*sn)->conn_rate,
+ rule->max_src_conn_rate.limit,
+ rule->max_src_conn_rate.seconds);
+
+ (*sn)->af = af;
+ if (rule->rule_flag & PFRULE_RULESRCTRACK ||
+ rule->rpool.opts & PF_POOL_STICKYADDR)
+ (*sn)->rule.ptr = rule;
+ else
+ (*sn)->rule.ptr = NULL;
+ PF_ACPY(&(*sn)->addr, src, af);
+ if (RB_INSERT(pf_src_tree,
+ &tree_src_tracking, *sn) != NULL) {
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf: src_tree insert failed: ");
+ pf_print_host(&(*sn)->addr, 0, af);
+ printf("\n");
+ }
+ pool_put(&pf_src_tree_pl, *sn);
+ return (-1);
+ }
+ (*sn)->creation = pf_time_second();
+ (*sn)->ruletype = rule->action;
+ if ((*sn)->rule.ptr != NULL)
+ (*sn)->rule.ptr->src_nodes++;
+ pf_status.scounters[SCNT_SRC_NODE_INSERT]++;
+ pf_status.src_nodes++;
+ } else {
+ if (rule->max_src_states &&
+ (*sn)->states >= rule->max_src_states) {
+ pf_status.lcounters[LCNT_SRCSTATES]++;
+ return (-1);
+ }
+ }
+ return (0);
+}
+
+static void
+pf_stateins_err(const char *tree, struct pf_state *s, struct pfi_kif *kif)
+{
+ struct pf_state_key *sk = s->state_key;
+
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+#ifndef NO_APPLE_EXTENSIONS
+ printf("pf: state insert failed: %s %s ", tree, kif->pfik_name);
+ switch (sk->proto) {
+ case IPPROTO_TCP:
+ printf("TCP");
+ break;
+ case IPPROTO_UDP:
+ printf("UDP");
+ break;
+ case IPPROTO_ICMP:
+ printf("ICMP4");
+ break;
+ case IPPROTO_ICMPV6:
+ printf("ICMP6");
+ break;
+ default:
+ printf("PROTO=%u", sk->proto);
+ break;
+ }
+ printf(" lan: ");
+ pf_print_sk_host(&sk->lan, sk->af, sk->proto,
+ sk->proto_variant);
+ printf(" gwy: ");
+ pf_print_sk_host(&sk->gwy, sk->af, sk->proto,
+ sk->proto_variant);
+ printf(" ext: ");
+ pf_print_sk_host(&sk->ext, sk->af, sk->proto,
+ sk->proto_variant);
+#else
+ printf("pf: state insert failed: %s %s", tree, kif->pfik_name);
+ printf(" lan: ");
+ pf_print_host(&sk->lan.addr, sk->lan.port,
+ sk->af);
+ printf(" gwy: ");
+ pf_print_host(&sk->gwy.addr, sk->gwy.port,
+ sk->af);
+ printf(" ext: ");
+ pf_print_host(&sk->ext.addr, sk->ext.port,
+ sk->af);
+#endif
+ if (s->sync_flags & PFSTATE_FROMSYNC)
+ printf(" (from sync)");
+ printf("\n");
+ }
+}
+
+int
+pf_insert_state(struct pfi_kif *kif, struct pf_state *s)
+{
+ struct pf_state_key *cur;
+ struct pf_state *sp;
+
+ VERIFY(s->state_key != NULL);
+ s->kif = kif;
+
+ if ((cur = RB_INSERT(pf_state_tree_lan_ext, &pf_statetbl_lan_ext,
+ s->state_key)) != NULL) {
+ /* key exists. check for same kif, if none, add to key */
+ TAILQ_FOREACH(sp, &cur->states, next)
+ if (sp->kif == kif) { /* collision! */
+ pf_stateins_err("tree_lan_ext", s, kif);
+ pf_detach_state(s,
+ PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY);
+ return (-1);
+ }
+ pf_detach_state(s, PF_DT_SKIP_LANEXT|PF_DT_SKIP_EXTGWY);
+ pf_attach_state(cur, s, kif == pfi_all ? 1 : 0);
+ }
+
+ /* if cur != NULL, we already found a state key and attached to it */
+ if (cur == NULL && (cur = RB_INSERT(pf_state_tree_ext_gwy,
+ &pf_statetbl_ext_gwy, s->state_key)) != NULL) {
+ /* must not happen. we must have found the sk above! */
+ pf_stateins_err("tree_ext_gwy", s, kif);
+ pf_detach_state(s, PF_DT_SKIP_EXTGWY);
+ return (-1);
+ }
+
+ if (s->id == 0 && s->creatorid == 0) {
+ s->id = htobe64(pf_status.stateid++);
+ s->creatorid = pf_status.hostid;
+ }
+ if (RB_INSERT(pf_state_tree_id, &tree_id, s) != NULL) {
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf: state insert failed: "
+ "id: %016llx creatorid: %08x",
+ be64toh(s->id), ntohl(s->creatorid));
+ if (s->sync_flags & PFSTATE_FROMSYNC)
+ printf(" (from sync)");
+ printf("\n");
+ }
+ pf_detach_state(s, 0);
+ return (-1);
+ }
+ TAILQ_INSERT_TAIL(&state_list, s, entry_list);
+ pf_status.fcounters[FCNT_STATE_INSERT]++;
+ pf_status.states++;
+ pfi_kif_ref(kif, PFI_KIF_REF_STATE);
+#if NPFSYNC
+ pfsync_insert_state(s);
+#endif
+ return (0);
+}
+
+void
+pf_purge_thread_fn(void *v, wait_result_t w)
+{
+#pragma unused(v, w)
+ u_int32_t nloops = 0;
+ int t = 0;
+
+ for (;;) {
+ (void) tsleep(pf_purge_thread_fn, PWAIT, "pftm", t * hz);
+
+ lck_rw_lock_shared(pf_perim_lock);
+ lck_mtx_lock(pf_lock);
+
+ /* purge everything if not running */
+ if (!pf_status.running) {
+ pf_purge_expired_states(pf_status.states);
+ pf_purge_expired_fragments();
+ pf_purge_expired_src_nodes();
+
+ /* terminate thread (we don't currently do this) */
+ if (pf_purge_thread == NULL) {
+ lck_mtx_unlock(pf_lock);
+ lck_rw_done(pf_perim_lock);
+
+ thread_deallocate(current_thread());
+ thread_terminate(current_thread());
+ /* NOTREACHED */
+ return;
+ } else {
+ /* if there's nothing left, sleep w/o timeout */
+ if (pf_status.states == 0 &&
+ pf_normalize_isempty() &&
+ RB_EMPTY(&tree_src_tracking))
+ t = 0;
+
+ lck_mtx_unlock(pf_lock);
+ lck_rw_done(pf_perim_lock);
+ continue;
+ }
+ } else if (t == 0) {
+ /* Set timeout to 1 second */
+ t = 1;
+ }
+
+ /* process a fraction of the state table every second */
+ pf_purge_expired_states(1 + (pf_status.states
+ / pf_default_rule.timeout[PFTM_INTERVAL]));
+
+ /* purge other expired types every PFTM_INTERVAL seconds */
+ if (++nloops >= pf_default_rule.timeout[PFTM_INTERVAL]) {
+ pf_purge_expired_fragments();
+ pf_purge_expired_src_nodes();
+ nloops = 0;
+ }
+
+ lck_mtx_unlock(pf_lock);
+ lck_rw_done(pf_perim_lock);
+ }
+}
+
+u_int64_t
+pf_state_expires(const struct pf_state *state)
+{
+ u_int32_t t;
+ u_int32_t start;
+ u_int32_t end;
+ u_int32_t states;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ /* handle all PFTM_* > PFTM_MAX here */
+ if (state->timeout == PFTM_PURGE)
+ return (pf_time_second());
+ if (state->timeout == PFTM_UNTIL_PACKET)
+ return (0);
+ VERIFY(state->timeout != PFTM_UNLINKED);
+ VERIFY(state->timeout < PFTM_MAX);
+ t = state->rule.ptr->timeout[state->timeout];
+ if (!t)
+ t = pf_default_rule.timeout[state->timeout];
+ start = state->rule.ptr->timeout[PFTM_ADAPTIVE_START];
+ if (start) {
+ end = state->rule.ptr->timeout[PFTM_ADAPTIVE_END];
+ states = state->rule.ptr->states;
+ } else {
+ start = pf_default_rule.timeout[PFTM_ADAPTIVE_START];
+ end = pf_default_rule.timeout[PFTM_ADAPTIVE_END];
+ states = pf_status.states;
+ }
+ if (end && states > start && start < end) {
+ if (states < end)
+ return (state->expire + t * (end - states) /
+ (end - start));
+ else
+ return (pf_time_second());
+ }
+ return (state->expire + t);
+}
+
+void
+pf_purge_expired_src_nodes(void)
+{
+ struct pf_src_node *cur, *next;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ for (cur = RB_MIN(pf_src_tree, &tree_src_tracking); cur; cur = next) {
+ next = RB_NEXT(pf_src_tree, &tree_src_tracking, cur);
+
+ if (cur->states <= 0 && cur->expire <= pf_time_second()) {
+ if (cur->rule.ptr != NULL) {
+ cur->rule.ptr->src_nodes--;
+ if (cur->rule.ptr->states <= 0 &&
+ cur->rule.ptr->max_src_nodes <= 0)
+ pf_rm_rule(NULL, cur->rule.ptr);
+ }
+ RB_REMOVE(pf_src_tree, &tree_src_tracking, cur);
+ pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
+ pf_status.src_nodes--;
+ pool_put(&pf_src_tree_pl, cur);
+ }
+ }
+}
+
+void
+pf_src_tree_remove_state(struct pf_state *s)
+{
+ u_int32_t t;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (s->src_node != NULL) {
+ if (s->src.tcp_est)
+ --s->src_node->conn;
+ if (--s->src_node->states <= 0) {
+ t = s->rule.ptr->timeout[PFTM_SRC_NODE];
+ if (!t)
+ t = pf_default_rule.timeout[PFTM_SRC_NODE];
+ s->src_node->expire = pf_time_second() + t;
+ }
+ }
+ if (s->nat_src_node != s->src_node && s->nat_src_node != NULL) {
+ if (--s->nat_src_node->states <= 0) {
+ t = s->rule.ptr->timeout[PFTM_SRC_NODE];
+ if (!t)
+ t = pf_default_rule.timeout[PFTM_SRC_NODE];
+ s->nat_src_node->expire = pf_time_second() + t;
+ }
+ }
+ s->src_node = s->nat_src_node = NULL;
+}
+
+void
+pf_unlink_state(struct pf_state *cur)
+{
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (cur->src.state == PF_TCPS_PROXY_DST) {
+ pf_send_tcp(cur->rule.ptr, cur->state_key->af,
+ &cur->state_key->ext.addr, &cur->state_key->lan.addr,
+ cur->state_key->ext.xport.port,
+ cur->state_key->lan.xport.port,
+ cur->src.seqhi, cur->src.seqlo + 1,
+ TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
+ }
+
+ hook_runloop(&cur->unlink_hooks, HOOK_REMOVE|HOOK_FREE);
+#else
+ if (cur->src.state == PF_TCPS_PROXY_DST) {
+ pf_send_tcp(cur->rule.ptr, cur->state_key->af,
+ &cur->state_key->ext.addr, &cur->state_key->lan.addr,
+ cur->state_key->ext.port, cur->state_key->lan.port,
+ cur->src.seqhi, cur->src.seqlo + 1,
+ TH_RST|TH_ACK, 0, 0, 0, 1, cur->tag, NULL, NULL);
+ }
+#endif
+ RB_REMOVE(pf_state_tree_id, &tree_id, cur);
+#if NPFSYNC
+ if (cur->creatorid == pf_status.hostid)
+ pfsync_delete_state(cur);
+#endif
+ cur->timeout = PFTM_UNLINKED;
+ pf_src_tree_remove_state(cur);
+ pf_detach_state(cur, 0);
+}
+
+/* callers should be at splpf and hold the
+ * write_lock on pf_consistency_lock */
+void
+pf_free_state(struct pf_state *cur)
+{
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+#if NPFSYNC
+ if (pfsyncif != NULL &&
+ (pfsyncif->sc_bulk_send_next == cur ||
+ pfsyncif->sc_bulk_terminator == cur))
+ return;
+#endif
+ VERIFY(cur->timeout == PFTM_UNLINKED);
+ if (--cur->rule.ptr->states <= 0 &&
+ cur->rule.ptr->src_nodes <= 0)
+ pf_rm_rule(NULL, cur->rule.ptr);
+ if (cur->nat_rule.ptr != NULL)
+ if (--cur->nat_rule.ptr->states <= 0 &&
+ cur->nat_rule.ptr->src_nodes <= 0)
+ pf_rm_rule(NULL, cur->nat_rule.ptr);
+ if (cur->anchor.ptr != NULL)
+ if (--cur->anchor.ptr->states <= 0)
+ pf_rm_rule(NULL, cur->anchor.ptr);
+ pf_normalize_tcp_cleanup(cur);
+ pfi_kif_unref(cur->kif, PFI_KIF_REF_STATE);
+ TAILQ_REMOVE(&state_list, cur, entry_list);
+ if (cur->tag)
+ pf_tag_unref(cur->tag);
+ pool_put(&pf_state_pl, cur);
+ pf_status.fcounters[FCNT_STATE_REMOVALS]++;
+ pf_status.states--;
+}
+
+void
+pf_purge_expired_states(u_int32_t maxcheck)
+{
+ static struct pf_state *cur = NULL;
+ struct pf_state *next;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ while (maxcheck--) {
+ /* wrap to start of list when we hit the end */
+ if (cur == NULL) {
+ cur = TAILQ_FIRST(&state_list);
+ if (cur == NULL)
+ break; /* list empty */
+ }
+
+ /* get next state, as cur may get deleted */
+ next = TAILQ_NEXT(cur, entry_list);
+
+ if (cur->timeout == PFTM_UNLINKED) {
+ pf_free_state(cur);
+ } else if (pf_state_expires(cur) <= pf_time_second()) {
+ /* unlink and free expired state */
+ pf_unlink_state(cur);
+ pf_free_state(cur);
+ }
+ cur = next;
+ }
+}
+
+int
+pf_tbladdr_setup(struct pf_ruleset *rs, struct pf_addr_wrap *aw)
+{
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (aw->type != PF_ADDR_TABLE)
+ return (0);
+ if ((aw->p.tbl = pfr_attach_table(rs, aw->v.tblname)) == NULL)
+ return (1);
+ return (0);
+}
+
+void
+pf_tbladdr_remove(struct pf_addr_wrap *aw)
+{
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (aw->type != PF_ADDR_TABLE || aw->p.tbl == NULL)
+ return;
+ pfr_detach_table(aw->p.tbl);
+ aw->p.tbl = NULL;
+}
+
+void
+pf_tbladdr_copyout(struct pf_addr_wrap *aw)
+{
+ struct pfr_ktable *kt = aw->p.tbl;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (aw->type != PF_ADDR_TABLE || kt == NULL)
+ return;
+ if (!(kt->pfrkt_flags & PFR_TFLAG_ACTIVE) && kt->pfrkt_root != NULL)
+ kt = kt->pfrkt_root;
+ aw->p.tbl = NULL;
+ aw->p.tblcnt = (kt->pfrkt_flags & PFR_TFLAG_ACTIVE) ?
+ kt->pfrkt_cnt : -1;
+}
+
+#ifndef NO_APPLE_EXTENSIONS
+static void
+pf_print_addr(struct pf_addr *addr, sa_family_t af)
+{
+ switch (af) {
+#if INET
+ case AF_INET: {
+ u_int32_t a = ntohl(addr->addr32[0]);
+ printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
+ (a>>8)&255, a&255);
+ break;
+ }
+#endif /* INET */
+#if INET6
+ case AF_INET6: {
+ u_int16_t b;
+ u_int8_t i, curstart = 255, curend = 0,
+ maxstart = 0, maxend = 0;
+ for (i = 0; i < 8; i++) {
+ if (!addr->addr16[i]) {
+ if (curstart == 255)
+ curstart = i;
+ else
+ curend = i;
+ } else {
+ if (curstart) {
+ if ((curend - curstart) >
+ (maxend - maxstart)) {
+ maxstart = curstart;
+ maxend = curend;
+ curstart = 255;
+ }
+ }
+ }
+ }
+ for (i = 0; i < 8; i++) {
+ if (i >= maxstart && i <= maxend) {
+ if (maxend != 7) {
+ if (i == maxstart)
+ printf(":");
+ } else {
+ if (i == maxend)
+ printf(":");
+ }
+ } else {
+ b = ntohs(addr->addr16[i]);
+ printf("%x", b);
+ if (i < 7)
+ printf(":");
+ }
+ }
+ break;
+ }
+#endif /* INET6 */
+ }
+}
+
+static void
+pf_print_sk_host(struct pf_state_host *sh, sa_family_t af, int proto,
+ u_int8_t proto_variant)
+{
+ pf_print_addr(&sh->addr, af);
+
+ switch (proto) {
+ case IPPROTO_ESP:
+ if (sh->xport.spi)
+ printf("[%08x]", ntohl(sh->xport.spi));
+ break;
+
+ case IPPROTO_GRE:
+ if (proto_variant == PF_GRE_PPTP_VARIANT)
+ printf("[%u]", ntohs(sh->xport.call_id));
+ break;
+
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ printf("[%u]", ntohs(sh->xport.port));
+ break;
+
+ default:
+ break;
+ }
+}
+#endif
+
+static void
+pf_print_host(struct pf_addr *addr, u_int16_t p, sa_family_t af)
+{
+#ifndef NO_APPLE_EXTENSIONS
+ pf_print_addr(addr, af);
+ if (p)
+ printf("[%u]", ntohs(p));
+#else
+ switch (af) {
+#if INET
+ case AF_INET: {
+ u_int32_t a = ntohl(addr->addr32[0]);
+ printf("%u.%u.%u.%u", (a>>24)&255, (a>>16)&255,
+ (a>>8)&255, a&255);
+ if (p) {
+ p = ntohs(p);
+ printf(":%u", p);
+ }
+ break;
+ }
+#endif /* INET */
+#if INET6
+ case AF_INET6: {
+ u_int16_t b;
+ u_int8_t i, curstart = 255, curend = 0,
+ maxstart = 0, maxend = 0;
+ for (i = 0; i < 8; i++) {
+ if (!addr->addr16[i]) {
+ if (curstart == 255)
+ curstart = i;
+ else
+ curend = i;
+ } else {
+ if (curstart) {
+ if ((curend - curstart) >
+ (maxend - maxstart)) {
+ maxstart = curstart;
+ maxend = curend;
+ curstart = 255;
+ }
+ }
+ }
+ }
+ for (i = 0; i < 8; i++) {
+ if (i >= maxstart && i <= maxend) {
+ if (maxend != 7) {
+ if (i == maxstart)
+ printf(":");
+ } else {
+ if (i == maxend)
+ printf(":");
+ }
+ } else {
+ b = ntohs(addr->addr16[i]);
+ printf("%x", b);
+ if (i < 7)
+ printf(":");
+ }
+ }
+ if (p) {
+ p = ntohs(p);
+ printf("[%u]", p);
+ }
+ break;
+ }
+#endif /* INET6 */
+ }
+#endif
+}
+
+void
+pf_print_state(struct pf_state *s)
+{
+ struct pf_state_key *sk = s->state_key;
+ switch (sk->proto) {
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_ESP:
+ printf("ESP ");
+ break;
+ case IPPROTO_GRE:
+ printf("GRE%u ", sk->proto_variant);
+ break;
+#endif
+ case IPPROTO_TCP:
+ printf("TCP ");
+ break;
+ case IPPROTO_UDP:
+ printf("UDP ");
+ break;
+ case IPPROTO_ICMP:
+ printf("ICMP ");
+ break;
+ case IPPROTO_ICMPV6:
+ printf("ICMPV6 ");
+ break;
+ default:
+ printf("%u ", sk->proto);
+ break;
+ }
+#ifndef NO_APPLE_EXTENSIONS
+ pf_print_sk_host(&sk->lan, sk->af, sk->proto, sk->proto_variant);
+ printf(" ");
+ pf_print_sk_host(&sk->gwy, sk->af, sk->proto, sk->proto_variant);
+ printf(" ");
+ pf_print_sk_host(&sk->ext, sk->af, sk->proto, sk->proto_variant);
+#else
+ pf_print_host(&sk->lan.addr, sk->lan.port, sk->af);
+ printf(" ");
+ pf_print_host(&sk->gwy.addr, sk->gwy.port, sk->af);
+ printf(" ");
+ pf_print_host(&sk->ext.addr, sk->ext.port, sk->af);
+#endif
+ printf(" [lo=%u high=%u win=%u modulator=%u", s->src.seqlo,
+ s->src.seqhi, s->src.max_win, s->src.seqdiff);
+ if (s->src.wscale && s->dst.wscale)
+ printf(" wscale=%u", s->src.wscale & PF_WSCALE_MASK);
+ printf("]");
+ printf(" [lo=%u high=%u win=%u modulator=%u", s->dst.seqlo,
+ s->dst.seqhi, s->dst.max_win, s->dst.seqdiff);
+ if (s->src.wscale && s->dst.wscale)
+ printf(" wscale=%u", s->dst.wscale & PF_WSCALE_MASK);
+ printf("]");
+ printf(" %u:%u", s->src.state, s->dst.state);
+}
+
+void
+pf_print_flags(u_int8_t f)
+{
+ if (f)
+ printf(" ");
+ if (f & TH_FIN)
+ printf("F");
+ if (f & TH_SYN)
+ printf("S");
+ if (f & TH_RST)
+ printf("R");
+ if (f & TH_PUSH)
+ printf("P");
+ if (f & TH_ACK)
+ printf("A");
+ if (f & TH_URG)
+ printf("U");
+ if (f & TH_ECE)
+ printf("E");
+ if (f & TH_CWR)
+ printf("W");
+}
+
+#define PF_SET_SKIP_STEPS(i) \
+ do { \
+ while (head[i] != cur) { \
+ head[i]->skip[i].ptr = cur; \
+ head[i] = TAILQ_NEXT(head[i], entries); \
+ } \
+ } while (0)
+
+void
+pf_calc_skip_steps(struct pf_rulequeue *rules)
+{
+ struct pf_rule *cur, *prev, *head[PF_SKIP_COUNT];
+ int i;
+
+ cur = TAILQ_FIRST(rules);
+ prev = cur;
+ for (i = 0; i < PF_SKIP_COUNT; ++i)
+ head[i] = cur;
+ while (cur != NULL) {
+
+ if (cur->kif != prev->kif || cur->ifnot != prev->ifnot)
+ PF_SET_SKIP_STEPS(PF_SKIP_IFP);
+ if (cur->direction != prev->direction)
+ PF_SET_SKIP_STEPS(PF_SKIP_DIR);
+ if (cur->af != prev->af)
+ PF_SET_SKIP_STEPS(PF_SKIP_AF);
+ if (cur->proto != prev->proto)
+ PF_SET_SKIP_STEPS(PF_SKIP_PROTO);
+ if (cur->src.neg != prev->src.neg ||
+ pf_addr_wrap_neq(&cur->src.addr, &prev->src.addr))
+ PF_SET_SKIP_STEPS(PF_SKIP_SRC_ADDR);
+#ifndef NO_APPLE_EXTENSIONS
+ {
+ union pf_rule_xport *cx = &cur->src.xport;
+ union pf_rule_xport *px = &prev->src.xport;
+
+ switch (cur->proto) {
+ case IPPROTO_GRE:
+ case IPPROTO_ESP:
+ PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
+ break;
+ default:
+ if (prev->proto == IPPROTO_GRE ||
+ prev->proto == IPPROTO_ESP ||
+ cx->range.op != px->range.op ||
+ cx->range.port[0] != px->range.port[0] ||
+ cx->range.port[1] != px->range.port[1])
+ PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
+ break;
+ }
+ }
+#else
+ if (cur->src.port[0] != prev->src.port[0] ||
+ cur->src.port[1] != prev->src.port[1] ||
+ cur->src.port_op != prev->src.port_op)
+ PF_SET_SKIP_STEPS(PF_SKIP_SRC_PORT);
+#endif
+ if (cur->dst.neg != prev->dst.neg ||
+ pf_addr_wrap_neq(&cur->dst.addr, &prev->dst.addr))
+ PF_SET_SKIP_STEPS(PF_SKIP_DST_ADDR);
+#ifndef NO_APPLE_EXTENSIONS
+ {
+ union pf_rule_xport *cx = &cur->dst.xport;
+ union pf_rule_xport *px = &prev->dst.xport;
+
+ switch (cur->proto) {
+ case IPPROTO_GRE:
+ if (cur->proto != prev->proto ||
+ cx->call_id != px->call_id)
+ PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
+ break;
+ case IPPROTO_ESP:
+ if (cur->proto != prev->proto ||
+ cx->spi != px->spi)
+ PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
+ break;
+ default:
+ if (prev->proto == IPPROTO_GRE ||
+ prev->proto == IPPROTO_ESP ||
+ cx->range.op != px->range.op ||
+ cx->range.port[0] != px->range.port[0] ||
+ cx->range.port[1] != px->range.port[1])
+ PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
+ break;
+ }
+ }
+#else
+ if (cur->dst.port[0] != prev->dst.port[0] ||
+ cur->dst.port[1] != prev->dst.port[1] ||
+ cur->dst.port_op != prev->dst.port_op)
+ PF_SET_SKIP_STEPS(PF_SKIP_DST_PORT);
+#endif
+
+ prev = cur;
+ cur = TAILQ_NEXT(cur, entries);
+ }
+ for (i = 0; i < PF_SKIP_COUNT; ++i)
+ PF_SET_SKIP_STEPS(i);
+}
+
+static int
+pf_addr_wrap_neq(struct pf_addr_wrap *aw1, struct pf_addr_wrap *aw2)
+{
+ if (aw1->type != aw2->type)
+ return (1);
+ switch (aw1->type) {
+ case PF_ADDR_ADDRMASK:
+ case PF_ADDR_RANGE:
+ if (PF_ANEQ(&aw1->v.a.addr, &aw2->v.a.addr, 0))
+ return (1);
+ if (PF_ANEQ(&aw1->v.a.mask, &aw2->v.a.mask, 0))
+ return (1);
+ return (0);
+ case PF_ADDR_DYNIFTL:
+ return (aw1->p.dyn->pfid_kt != aw2->p.dyn->pfid_kt);
+ case PF_ADDR_NOROUTE:
+ case PF_ADDR_URPFFAILED:
+ return (0);
+ case PF_ADDR_TABLE:
+ return (aw1->p.tbl != aw2->p.tbl);
+ case PF_ADDR_RTLABEL:
+ return (aw1->v.rtlabel != aw2->v.rtlabel);
+ default:
+ printf("invalid address type: %d\n", aw1->type);
+ return (1);
+ }
+}
+
+u_int16_t
+pf_cksum_fixup(u_int16_t cksum, u_int16_t old, u_int16_t new, u_int8_t udp)
+{
+ u_int32_t l;
+
+ if (udp && !cksum)
+ return (0);
+ l = cksum + old - new;
+ l = (l >> 16) + (l & 0xffff);
+ l = l & 0xffff;
+ if (udp && !l)
+ return (0xffff);
+ return (l);
+}
+
+static void
+pf_change_ap(int dir, struct mbuf *m, struct pf_addr *a, u_int16_t *p,
+ u_int16_t *ic, u_int16_t *pc, struct pf_addr *an, u_int16_t pn,
+ u_int8_t u, sa_family_t af)
+{
+ struct pf_addr ao;
+ u_int16_t po = *p;
+
+ PF_ACPY(&ao, a, af);
+ PF_ACPY(a, an, af);
+
+ *p = pn;
+
+ switch (af) {
+#if INET
+ case AF_INET:
+ *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
+ ao.addr16[0], an->addr16[0], 0),
+ ao.addr16[1], an->addr16[1], 0);
+ *p = pn;
+ /*
+ * If the packet is originated from an ALG on the NAT gateway
+ * (source address is loopback or local), in which case the
+ * TCP/UDP checksum field contains the pseudo header checksum
+ * that's not yet complemented.
+ */
+ if (dir == PF_OUT && m != NULL &&
+ (m->m_flags & M_PKTHDR) &&
+ (m->m_pkthdr.csum_flags & (CSUM_TCP | CSUM_UDP))) {
+ /* Pseudo-header checksum does not include ports */
+ *pc = ~pf_cksum_fixup(pf_cksum_fixup(~*pc,
+ ao.addr16[0], an->addr16[0], u),
+ ao.addr16[1], an->addr16[1], u);
+ } else {
+ *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
+ ao.addr16[0], an->addr16[0], u),
+ ao.addr16[1], an->addr16[1], u),
+ po, pn, u);
+ }
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ *pc = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(*pc,
+ ao.addr16[0], an->addr16[0], u),
+ ao.addr16[1], an->addr16[1], u),
+ ao.addr16[2], an->addr16[2], u),
+ ao.addr16[3], an->addr16[3], u),
+ ao.addr16[4], an->addr16[4], u),
+ ao.addr16[5], an->addr16[5], u),
+ ao.addr16[6], an->addr16[6], u),
+ ao.addr16[7], an->addr16[7], u),
+ po, pn, u);
+ break;
+#endif /* INET6 */
+ }
+}
+
+
+/* Changes a u_int32_t. Uses a void * so there are no align restrictions */
+void
+pf_change_a(void *a, u_int16_t *c, u_int32_t an, u_int8_t u)
+{
+ u_int32_t ao;
+
+ memcpy(&ao, a, sizeof (ao));
+ memcpy(a, &an, sizeof (u_int32_t));
+ *c = pf_cksum_fixup(pf_cksum_fixup(*c, ao / 65536, an / 65536, u),
+ ao % 65536, an % 65536, u);
+}
+
+#if INET6
+static void
+pf_change_a6(struct pf_addr *a, u_int16_t *c, struct pf_addr *an, u_int8_t u)
+{
+ struct pf_addr ao;
+
+ PF_ACPY(&ao, a, AF_INET6);
+ PF_ACPY(a, an, AF_INET6);
+
+ *c = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(*c,
+ ao.addr16[0], an->addr16[0], u),
+ ao.addr16[1], an->addr16[1], u),
+ ao.addr16[2], an->addr16[2], u),
+ ao.addr16[3], an->addr16[3], u),
+ ao.addr16[4], an->addr16[4], u),
+ ao.addr16[5], an->addr16[5], u),
+ ao.addr16[6], an->addr16[6], u),
+ ao.addr16[7], an->addr16[7], u);
+}
+#endif /* INET6 */
+
+static void
+pf_change_icmp(struct pf_addr *ia, u_int16_t *ip, struct pf_addr *oa,
+ struct pf_addr *na, u_int16_t np, u_int16_t *pc, u_int16_t *h2c,
+ u_int16_t *ic, u_int16_t *hc, u_int8_t u, sa_family_t af)
+{
+ struct pf_addr oia, ooa;
+
+ PF_ACPY(&oia, ia, af);
+ PF_ACPY(&ooa, oa, af);
+
+ /* Change inner protocol port, fix inner protocol checksum. */
+ if (ip != NULL) {
+ u_int16_t oip = *ip;
+ u_int32_t opc = 0;
+
+ if (pc != NULL)
+ opc = *pc;
+ *ip = np;
+ if (pc != NULL)
+ *pc = pf_cksum_fixup(*pc, oip, *ip, u);
+ *ic = pf_cksum_fixup(*ic, oip, *ip, 0);
+ if (pc != NULL)
+ *ic = pf_cksum_fixup(*ic, opc, *pc, 0);
+ }
+ /* Change inner ip address, fix inner ip and icmp checksums. */
+ PF_ACPY(ia, na, af);
+ switch (af) {
+#if INET
+ case AF_INET: {
+ u_int32_t oh2c = *h2c;
+
+ *h2c = pf_cksum_fixup(pf_cksum_fixup(*h2c,
+ oia.addr16[0], ia->addr16[0], 0),
+ oia.addr16[1], ia->addr16[1], 0);
+ *ic = pf_cksum_fixup(pf_cksum_fixup(*ic,
+ oia.addr16[0], ia->addr16[0], 0),
+ oia.addr16[1], ia->addr16[1], 0);
+ *ic = pf_cksum_fixup(*ic, oh2c, *h2c, 0);
+ break;
+ }
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(*ic,
+ oia.addr16[0], ia->addr16[0], u),
+ oia.addr16[1], ia->addr16[1], u),
+ oia.addr16[2], ia->addr16[2], u),
+ oia.addr16[3], ia->addr16[3], u),
+ oia.addr16[4], ia->addr16[4], u),
+ oia.addr16[5], ia->addr16[5], u),
+ oia.addr16[6], ia->addr16[6], u),
+ oia.addr16[7], ia->addr16[7], u);
+ break;
+#endif /* INET6 */
+ }
+ /* Change outer ip address, fix outer ip or icmpv6 checksum. */
+ PF_ACPY(oa, na, af);
+ switch (af) {
+#if INET
+ case AF_INET:
+ *hc = pf_cksum_fixup(pf_cksum_fixup(*hc,
+ ooa.addr16[0], oa->addr16[0], 0),
+ ooa.addr16[1], oa->addr16[1], 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ *ic = pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(pf_cksum_fixup(
+ pf_cksum_fixup(pf_cksum_fixup(*ic,
+ ooa.addr16[0], oa->addr16[0], u),
+ ooa.addr16[1], oa->addr16[1], u),
+ ooa.addr16[2], oa->addr16[2], u),
+ ooa.addr16[3], oa->addr16[3], u),
+ ooa.addr16[4], oa->addr16[4], u),
+ ooa.addr16[5], oa->addr16[5], u),
+ ooa.addr16[6], oa->addr16[6], u),
+ ooa.addr16[7], oa->addr16[7], u);
+ break;
+#endif /* INET6 */
+ }
+}
+
+
+/*
+ * Need to modulate the sequence numbers in the TCP SACK option
+ * (credits to Krzysztof Pfaff for report and patch)
+ */
+static int
+pf_modulate_sack(struct mbuf *m, int off, struct pf_pdesc *pd,
+ struct tcphdr *th, struct pf_state_peer *dst)
+{
+ int hlen = (th->th_off << 2) - sizeof (*th), thoptlen = hlen;
+ u_int8_t opts[MAX_TCPOPTLEN], *opt = opts;
+ int copyback = 0, i, olen;
+ struct sackblk sack;
+
+#define TCPOLEN_SACKLEN (TCPOLEN_SACK + 2)
+ if (hlen < TCPOLEN_SACKLEN ||
+ !pf_pull_hdr(m, off + sizeof (*th), opts, hlen, NULL, NULL, pd->af))
+ return (0);
+
+ while (hlen >= TCPOLEN_SACKLEN) {
+ olen = opt[1];
+ switch (*opt) {
+ case TCPOPT_EOL: /* FALLTHROUGH */
+ case TCPOPT_NOP:
+ opt++;
+ hlen--;
+ break;
+ case TCPOPT_SACK:
+ if (olen > hlen)
+ olen = hlen;
+ if (olen >= TCPOLEN_SACKLEN) {
+ for (i = 2; i + TCPOLEN_SACK <= olen;
+ i += TCPOLEN_SACK) {
+ memcpy(&sack, &opt[i], sizeof (sack));
+ pf_change_a(&sack.start, &th->th_sum,
+ htonl(ntohl(sack.start) -
+ dst->seqdiff), 0);
+ pf_change_a(&sack.end, &th->th_sum,
+ htonl(ntohl(sack.end) -
+ dst->seqdiff), 0);
+ memcpy(&opt[i], &sack, sizeof (sack));
+ }
+#ifndef NO_APPLE_EXTENSIONS
+ copyback = off + sizeof (*th) + thoptlen;
+#else
+ copyback = 1;
+#endif
+ }
+ /* FALLTHROUGH */
+ default:
+ if (olen < 2)
+ olen = 2;
+ hlen -= olen;
+ opt += olen;
+ }
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (copyback) {
+ m = pf_lazy_makewritable(pd, m, copyback);
+ if (!m)
+ return (-1);
+ m_copyback(m, off + sizeof (*th), thoptlen, opts);
+ }
+#else
+ if (copyback)
+ m_copyback(m, off + sizeof (*th), thoptlen, opts);
+#endif
+ return (copyback);
+}
+
+static void
+pf_send_tcp(const struct pf_rule *r, sa_family_t af,
+ const struct pf_addr *saddr, const struct pf_addr *daddr,
+ u_int16_t sport, u_int16_t dport, u_int32_t seq, u_int32_t ack,
+ u_int8_t flags, u_int16_t win, u_int16_t mss, u_int8_t ttl, int tag,
+ u_int16_t rtag, struct ether_header *eh, struct ifnet *ifp)
+{
+#pragma unused(eh, ifp)
+ struct mbuf *m;
+ int len, tlen;
+#if INET
+ struct ip *h = NULL;
+#endif /* INET */
+#if INET6
+ struct ip6_hdr *h6 = NULL;
+#endif /* INET6 */
+ struct tcphdr *th = NULL;
+ char *opt;
+ struct pf_mtag *pf_mtag;
+
+ /* maximum segment size tcp option */
+ tlen = sizeof (struct tcphdr);
+ if (mss)
+ tlen += 4;
+
+ switch (af) {
+#if INET
+ case AF_INET:
+ len = sizeof (struct ip) + tlen;
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ len = sizeof (struct ip6_hdr) + tlen;
+ break;
+#endif /* INET6 */
+ default:
+ panic("pf_send_tcp: not AF_INET or AF_INET6!");
+ return;
+ }
+
+ /* create outgoing mbuf */
+ m = m_gethdr(M_DONTWAIT, MT_HEADER);
+ if (m == NULL)
+ return;
+
+ if ((pf_mtag = pf_get_mtag(m)) == NULL) {
+ m_free(m);
+ return;
+ }
+
+ if (tag)
+ pf_mtag->flags |= PF_TAG_GENERATED;
+ pf_mtag->tag = rtag;
+
+ if (r != NULL && PF_RTABLEID_IS_VALID(r->rtableid))
+ pf_mtag->rtableid = r->rtableid;
+
+#if ALTQ
+ if (r != NULL && r->qid) {
+ pf_mtag->qid = r->qid;
+ /* add hints for ecn */
+ pf_mtag->hdr = mtod(m, struct ip *);
+ }
+#endif /* ALTQ */
+ m->m_data += max_linkhdr;
+ m->m_pkthdr.len = m->m_len = len;
+ m->m_pkthdr.rcvif = NULL;
+ bzero(m->m_data, len);
+ switch (af) {
+#if INET
+ case AF_INET:
+ h = mtod(m, struct ip *);
+
+ /* IP header fields included in the TCP checksum */
+ h->ip_p = IPPROTO_TCP;
+ h->ip_len = htons(tlen);
+ h->ip_src.s_addr = saddr->v4.s_addr;
+ h->ip_dst.s_addr = daddr->v4.s_addr;
+
+ th = (struct tcphdr *)((caddr_t)h + sizeof (struct ip));
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ h6 = mtod(m, struct ip6_hdr *);
+
+ /* IP header fields included in the TCP checksum */
+ h6->ip6_nxt = IPPROTO_TCP;
+ h6->ip6_plen = htons(tlen);
+ memcpy(&h6->ip6_src, &saddr->v6, sizeof (struct in6_addr));
+ memcpy(&h6->ip6_dst, &daddr->v6, sizeof (struct in6_addr));
+
+ th = (struct tcphdr *)((caddr_t)h6 + sizeof (struct ip6_hdr));
+ break;
+#endif /* INET6 */
+ }
+
+ /* TCP header */
+ th->th_sport = sport;
+ th->th_dport = dport;
+ th->th_seq = htonl(seq);
+ th->th_ack = htonl(ack);
+ th->th_off = tlen >> 2;
+ th->th_flags = flags;
+ th->th_win = htons(win);
+
+ if (mss) {
+ opt = (char *)(th + 1);
+ opt[0] = TCPOPT_MAXSEG;
+ opt[1] = 4;
+#if BYTE_ORDER != BIG_ENDIAN
+ HTONS(mss);
+#endif
+ bcopy((caddr_t)&mss, (caddr_t)(opt + 2), 2);
+ }
+
+ switch (af) {
+#if INET
+ case AF_INET: {
+ struct route ro;
+
+ /* TCP checksum */
+ th->th_sum = in_cksum(m, len);
+
+ /* Finish the IP header */
+ h->ip_v = 4;
+ h->ip_hl = sizeof (*h) >> 2;
+ h->ip_tos = IPTOS_LOWDELAY;
+ /*
+ * ip_output() expects ip_len and ip_off to be in host order.
+ */
+ h->ip_len = len;
+ h->ip_off = (path_mtu_discovery ? IP_DF : 0);
+ h->ip_ttl = ttl ? ttl : ip_defttl;
+ h->ip_sum = 0;
+
+ bzero(&ro, sizeof (ro));
+ ip_output(m, NULL, &ro, 0, NULL, NULL);
+ if (ro.ro_rt != NULL)
+ rtfree(ro.ro_rt);
+ break;
+ }
+#endif /* INET */
+#if INET6
+ case AF_INET6: {
+ struct route_in6 ro6;
+
+ /* TCP checksum */
+ th->th_sum = in6_cksum(m, IPPROTO_TCP,
+ sizeof (struct ip6_hdr), tlen);
+
+ h6->ip6_vfc |= IPV6_VERSION;
+ h6->ip6_hlim = IPV6_DEFHLIM;
+
+ bzero(&ro6, sizeof (ro6));
+ ip6_output(m, NULL, &ro6, 0, NULL, NULL, 0);
+ if (ro6.ro_rt != NULL)
+ rtfree(ro6.ro_rt);
+ break;
+ }
+#endif /* INET6 */
+ }
+}
+
+static void
+pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
+ struct pf_rule *r)
+{
+ struct mbuf *m0;
+ struct pf_mtag *pf_mtag;
+
+ m0 = m_copy(m, 0, M_COPYALL);
+ if (m0 == NULL)
+ return;
+
+ if ((pf_mtag = pf_get_mtag(m0)) == NULL)
+ return;
+
+ pf_mtag->flags |= PF_TAG_GENERATED;
+
+ if (PF_RTABLEID_IS_VALID(r->rtableid))
+ pf_mtag->rtableid = r->rtableid;
+
+#if ALTQ
+ if (r->qid) {
+ pf_mtag->qid = r->qid;
+ /* add hints for ecn */
+ pf_mtag->hdr = mtod(m0, struct ip *);
+ }
+#endif /* ALTQ */
+ switch (af) {
+#if INET
+ case AF_INET:
+ icmp_error(m0, type, code, 0, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ icmp6_error(m0, type, code, 0);
+ break;
+#endif /* INET6 */
+ }
+}
+
+/*
+ * Return 1 if the addresses a and b match (with mask m), otherwise return 0.
+ * If n is 0, they match if they are equal. If n is != 0, they match if they
+ * are different.
+ */
+int
+pf_match_addr(u_int8_t n, struct pf_addr *a, struct pf_addr *m,
+ struct pf_addr *b, sa_family_t af)
+{
+ int match = 0;
+
+ switch (af) {
+#if INET
+ case AF_INET:
+ if ((a->addr32[0] & m->addr32[0]) ==
+ (b->addr32[0] & m->addr32[0]))
+ match++;
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (((a->addr32[0] & m->addr32[0]) ==
+ (b->addr32[0] & m->addr32[0])) &&
+ ((a->addr32[1] & m->addr32[1]) ==
+ (b->addr32[1] & m->addr32[1])) &&
+ ((a->addr32[2] & m->addr32[2]) ==
+ (b->addr32[2] & m->addr32[2])) &&
+ ((a->addr32[3] & m->addr32[3]) ==
+ (b->addr32[3] & m->addr32[3])))
+ match++;
+ break;
+#endif /* INET6 */
+ }
+ if (match) {
+ if (n)
+ return (0);
+ else
+ return (1);
+ } else {
+ if (n)
+ return (1);
+ else
+ return (0);
+ }
+}
+
+/*
+ * Return 1 if b <= a <= e, otherwise return 0.
+ */
+int
+pf_match_addr_range(struct pf_addr *b, struct pf_addr *e,
+ struct pf_addr *a, sa_family_t af)
+{
+ switch (af) {
+#if INET
+ case AF_INET:
+ if ((a->addr32[0] < b->addr32[0]) ||
+ (a->addr32[0] > e->addr32[0]))
+ return (0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6: {
+ int i;
+
+ /* check a >= b */
+ for (i = 0; i < 4; ++i)
+ if (a->addr32[i] > b->addr32[i])
+ break;
+ else if (a->addr32[i] < b->addr32[i])
+ return (0);
+ /* check a <= e */
+ for (i = 0; i < 4; ++i)
+ if (a->addr32[i] < e->addr32[i])
+ break;
+ else if (a->addr32[i] > e->addr32[i])
+ return (0);
+ break;
+ }
+#endif /* INET6 */
+ }
+ return (1);
+}
+
+int
+pf_match(u_int8_t op, u_int32_t a1, u_int32_t a2, u_int32_t p)
+{
+ switch (op) {
+ case PF_OP_IRG:
+ return ((p > a1) && (p < a2));
+ case PF_OP_XRG:
+ return ((p < a1) || (p > a2));
+ case PF_OP_RRG:
+ return ((p >= a1) && (p <= a2));
+ case PF_OP_EQ:
+ return (p == a1);
+ case PF_OP_NE:
+ return (p != a1);
+ case PF_OP_LT:
+ return (p < a1);
+ case PF_OP_LE:
+ return (p <= a1);
+ case PF_OP_GT:
+ return (p > a1);
+ case PF_OP_GE:
+ return (p >= a1);
+ }
+ return (0); /* never reached */
+}
+
+int
+pf_match_port(u_int8_t op, u_int16_t a1, u_int16_t a2, u_int16_t p)
+{
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(a1);
+ NTOHS(a2);
+ NTOHS(p);
+#endif
+ return (pf_match(op, a1, a2, p));
+}
+
+#ifndef NO_APPLE_EXTENSIONS
+int
+pf_match_xport(u_int8_t proto, u_int8_t proto_variant, union pf_rule_xport *rx,
+ union pf_state_xport *sx)
+{
+ int d = !0;
+
+ if (sx) {
+ switch (proto) {
+ case IPPROTO_GRE:
+ if (proto_variant == PF_GRE_PPTP_VARIANT)
+ d = (rx->call_id == sx->call_id);
+ break;
+
+ case IPPROTO_ESP:
+ d = (rx->spi == sx->spi);
+ break;
+
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ case IPPROTO_ICMP:
+ case IPPROTO_ICMPV6:
+ if (rx->range.op)
+ d = pf_match_port(rx->range.op,
+ rx->range.port[0], rx->range.port[1],
+ sx->port);
+ break;
+
+ default:
+ break;
+ }
+ }
+
+ return (d);
+}
+#endif
+
+int
+pf_match_uid(u_int8_t op, uid_t a1, uid_t a2, uid_t u)
+{
+ if (u == UID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
+ return (0);
+ return (pf_match(op, a1, a2, u));
+}
+
+int
+pf_match_gid(u_int8_t op, gid_t a1, gid_t a2, gid_t g)
+{
+ if (g == GID_MAX && op != PF_OP_EQ && op != PF_OP_NE)
+ return (0);
+ return (pf_match(op, a1, a2, g));
+}
+
+static int
+pf_match_tag(struct mbuf *m, struct pf_rule *r, struct pf_mtag *pf_mtag,
+ int *tag)
+{
+#pragma unused(m)
+ if (*tag == -1)
+ *tag = pf_mtag->tag;
+
+ return ((!r->match_tag_not && r->match_tag == *tag) ||
+ (r->match_tag_not && r->match_tag != *tag));
+}
+
+int
+pf_tag_packet(struct mbuf *m, struct pf_mtag *pf_mtag, int tag,
+ unsigned int rtableid)
+{
+ if (tag <= 0 && !PF_RTABLEID_IS_VALID(rtableid))
+ return (0);
+
+ if (pf_mtag == NULL && (pf_mtag = pf_get_mtag(m)) == NULL)
+ return (1);
+
+ if (tag > 0)
+ pf_mtag->tag = tag;
+ if (PF_RTABLEID_IS_VALID(rtableid))
+ pf_mtag->rtableid = rtableid;
+
+ return (0);
+}
+
+static void
+pf_step_into_anchor(int *depth, struct pf_ruleset **rs, int n,
+ struct pf_rule **r, struct pf_rule **a, int *match)
+{
+ struct pf_anchor_stackframe *f;
+
+ (*r)->anchor->match = 0;
+ if (match)
+ *match = 0;
+ if (*depth >= (int)sizeof (pf_anchor_stack) /
+ (int)sizeof (pf_anchor_stack[0])) {
+ printf("pf_step_into_anchor: stack overflow\n");
+ *r = TAILQ_NEXT(*r, entries);
+ return;
+ } else if (*depth == 0 && a != NULL)
+ *a = *r;
+ f = pf_anchor_stack + (*depth)++;
+ f->rs = *rs;
+ f->r = *r;
+ if ((*r)->anchor_wildcard) {
+ f->parent = &(*r)->anchor->children;
+ if ((f->child = RB_MIN(pf_anchor_node, f->parent)) ==
+ NULL) {
+ *r = NULL;
+ return;
+ }
+ *rs = &f->child->ruleset;
+ } else {
+ f->parent = NULL;
+ f->child = NULL;
+ *rs = &(*r)->anchor->ruleset;
+ }
+ *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
+}
+
+static int
+pf_step_out_of_anchor(int *depth, struct pf_ruleset **rs, int n,
+ struct pf_rule **r, struct pf_rule **a, int *match)
+{
+ struct pf_anchor_stackframe *f;
+ int quick = 0;
+
+ do {
+ if (*depth <= 0)
+ break;
+ f = pf_anchor_stack + *depth - 1;
+ if (f->parent != NULL && f->child != NULL) {
+ if (f->child->match ||
+ (match != NULL && *match)) {
+ f->r->anchor->match = 1;
+ *match = 0;
+ }
+ f->child = RB_NEXT(pf_anchor_node, f->parent, f->child);
+ if (f->child != NULL) {
+ *rs = &f->child->ruleset;
+ *r = TAILQ_FIRST((*rs)->rules[n].active.ptr);
+ if (*r == NULL)
+ continue;
+ else
+ break;
+ }
+ }
+ (*depth)--;
+ if (*depth == 0 && a != NULL)
+ *a = NULL;
+ *rs = f->rs;
+ if (f->r->anchor->match || (match != NULL && *match))
+ quick = f->r->quick;
+ *r = TAILQ_NEXT(f->r, entries);
+ } while (*r == NULL);
+
+ return (quick);
+}
+
+#if INET6
+void
+pf_poolmask(struct pf_addr *naddr, struct pf_addr *raddr,
+ struct pf_addr *rmask, struct pf_addr *saddr, sa_family_t af)
+{
+ switch (af) {
+#if INET
+ case AF_INET:
+ naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
+ ((rmask->addr32[0] ^ 0xffffffff) & saddr->addr32[0]);
+ break;
+#endif /* INET */
+ case AF_INET6:
+ naddr->addr32[0] = (raddr->addr32[0] & rmask->addr32[0]) |
+ ((rmask->addr32[0] ^ 0xffffffff) & saddr->addr32[0]);
+ naddr->addr32[1] = (raddr->addr32[1] & rmask->addr32[1]) |
+ ((rmask->addr32[1] ^ 0xffffffff) & saddr->addr32[1]);
+ naddr->addr32[2] = (raddr->addr32[2] & rmask->addr32[2]) |
+ ((rmask->addr32[2] ^ 0xffffffff) & saddr->addr32[2]);
+ naddr->addr32[3] = (raddr->addr32[3] & rmask->addr32[3]) |
+ ((rmask->addr32[3] ^ 0xffffffff) & saddr->addr32[3]);
+ break;
+ }
+}
+
+void
+pf_addr_inc(struct pf_addr *addr, sa_family_t af)
+{
+ switch (af) {
+#if INET
+ case AF_INET:
+ addr->addr32[0] = htonl(ntohl(addr->addr32[0]) + 1);
+ break;
+#endif /* INET */
+ case AF_INET6:
+ if (addr->addr32[3] == 0xffffffff) {
+ addr->addr32[3] = 0;
+ if (addr->addr32[2] == 0xffffffff) {
+ addr->addr32[2] = 0;
+ if (addr->addr32[1] == 0xffffffff) {
+ addr->addr32[1] = 0;
+ addr->addr32[0] =
+ htonl(ntohl(addr->addr32[0]) + 1);
+ } else
+ addr->addr32[1] =
+ htonl(ntohl(addr->addr32[1]) + 1);
+ } else
+ addr->addr32[2] =
+ htonl(ntohl(addr->addr32[2]) + 1);
+ } else
+ addr->addr32[3] =
+ htonl(ntohl(addr->addr32[3]) + 1);
+ break;
+ }
+}
+#endif /* INET6 */
+
+#define mix(a, b, c) \
+ do { \
+ a -= b; a -= c; a ^= (c >> 13); \
+ b -= c; b -= a; b ^= (a << 8); \
+ c -= a; c -= b; c ^= (b >> 13); \
+ a -= b; a -= c; a ^= (c >> 12); \
+ b -= c; b -= a; b ^= (a << 16); \
+ c -= a; c -= b; c ^= (b >> 5); \
+ a -= b; a -= c; a ^= (c >> 3); \
+ b -= c; b -= a; b ^= (a << 10); \
+ c -= a; c -= b; c ^= (b >> 15); \
+ } while (0)
+
+/*
+ * hash function based on bridge_hash in if_bridge.c
+ */
+static void
+pf_hash(struct pf_addr *inaddr, struct pf_addr *hash,
+ struct pf_poolhashkey *key, sa_family_t af)
+{
+ u_int32_t a = 0x9e3779b9, b = 0x9e3779b9, c = key->key32[0];
+
+ switch (af) {
+#if INET
+ case AF_INET:
+ a += inaddr->addr32[0];
+ b += key->key32[1];
+ mix(a, b, c);
+ hash->addr32[0] = c + key->key32[2];
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ a += inaddr->addr32[0];
+ b += inaddr->addr32[2];
+ mix(a, b, c);
+ hash->addr32[0] = c;
+ a += inaddr->addr32[1];
+ b += inaddr->addr32[3];
+ c += key->key32[1];
+ mix(a, b, c);
+ hash->addr32[1] = c;
+ a += inaddr->addr32[2];
+ b += inaddr->addr32[1];
+ c += key->key32[2];
+ mix(a, b, c);
+ hash->addr32[2] = c;
+ a += inaddr->addr32[3];
+ b += inaddr->addr32[0];
+ c += key->key32[3];
+ mix(a, b, c);
+ hash->addr32[3] = c;
+ break;
+#endif /* INET6 */
+ }
+}
+
+static int
+pf_map_addr(sa_family_t af, struct pf_rule *r, struct pf_addr *saddr,
+ struct pf_addr *naddr, struct pf_addr *init_addr, struct pf_src_node **sn)
+{
+ unsigned char hash[16];
+ struct pf_pool *rpool = &r->rpool;
+ struct pf_addr *raddr = &rpool->cur->addr.v.a.addr;
+ struct pf_addr *rmask = &rpool->cur->addr.v.a.mask;
+ struct pf_pooladdr *acur = rpool->cur;
+ struct pf_src_node k;
+
+ if (*sn == NULL && r->rpool.opts & PF_POOL_STICKYADDR &&
+ (r->rpool.opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
+ k.af = af;
+ PF_ACPY(&k.addr, saddr, af);
+ if (r->rule_flag & PFRULE_RULESRCTRACK ||
+ r->rpool.opts & PF_POOL_STICKYADDR)
+ k.rule.ptr = r;
+ else
+ k.rule.ptr = NULL;
+ pf_status.scounters[SCNT_SRC_NODE_SEARCH]++;
+ *sn = RB_FIND(pf_src_tree, &tree_src_tracking, &k);
+ if (*sn != NULL && !PF_AZERO(&(*sn)->raddr, af)) {
+ PF_ACPY(naddr, &(*sn)->raddr, af);
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf_map_addr: src tracking maps ");
+ pf_print_host(&k.addr, 0, af);
+ printf(" to ");
+ pf_print_host(naddr, 0, af);
+ printf("\n");
+ }
+ return (0);
+ }
+ }
+
+ if (rpool->cur->addr.type == PF_ADDR_NOROUTE)
+ return (1);
+ if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
+ switch (af) {
+#if INET
+ case AF_INET:
+ if (rpool->cur->addr.p.dyn->pfid_acnt4 < 1 &&
+ (rpool->opts & PF_POOL_TYPEMASK) !=
+ PF_POOL_ROUNDROBIN)
+ return (1);
+ raddr = &rpool->cur->addr.p.dyn->pfid_addr4;
+ rmask = &rpool->cur->addr.p.dyn->pfid_mask4;
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (rpool->cur->addr.p.dyn->pfid_acnt6 < 1 &&
+ (rpool->opts & PF_POOL_TYPEMASK) !=
+ PF_POOL_ROUNDROBIN)
+ return (1);
+ raddr = &rpool->cur->addr.p.dyn->pfid_addr6;
+ rmask = &rpool->cur->addr.p.dyn->pfid_mask6;
+ break;
+#endif /* INET6 */
+ }
+ } else if (rpool->cur->addr.type == PF_ADDR_TABLE) {
+ if ((rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_ROUNDROBIN)
+ return (1); /* unsupported */
+ } else {
+ raddr = &rpool->cur->addr.v.a.addr;
+ rmask = &rpool->cur->addr.v.a.mask;
+ }
+
+ switch (rpool->opts & PF_POOL_TYPEMASK) {
+ case PF_POOL_NONE:
+ PF_ACPY(naddr, raddr, af);
+ break;
+ case PF_POOL_BITMASK:
+ PF_POOLMASK(naddr, raddr, rmask, saddr, af);
+ break;
+ case PF_POOL_RANDOM:
+ if (init_addr != NULL && PF_AZERO(init_addr, af)) {
+ switch (af) {
+#if INET
+ case AF_INET:
+ rpool->counter.addr32[0] = htonl(random());
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (rmask->addr32[3] != 0xffffffff)
+ rpool->counter.addr32[3] =
+ htonl(random());
+ else
+ break;
+ if (rmask->addr32[2] != 0xffffffff)
+ rpool->counter.addr32[2] =
+ htonl(random());
+ else
+ break;
+ if (rmask->addr32[1] != 0xffffffff)
+ rpool->counter.addr32[1] =
+ htonl(random());
+ else
+ break;
+ if (rmask->addr32[0] != 0xffffffff)
+ rpool->counter.addr32[0] =
+ htonl(random());
+ break;
+#endif /* INET6 */
+ }
+ PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
+ PF_ACPY(init_addr, naddr, af);
+
+ } else {
+ PF_AINC(&rpool->counter, af);
+ PF_POOLMASK(naddr, raddr, rmask, &rpool->counter, af);
+ }
+ break;
+ case PF_POOL_SRCHASH:
+ pf_hash(saddr, (struct pf_addr *)&hash, &rpool->key, af);
+ PF_POOLMASK(naddr, raddr, rmask, (struct pf_addr *)&hash, af);
+ break;
+ case PF_POOL_ROUNDROBIN:
+ if (rpool->cur->addr.type == PF_ADDR_TABLE) {
+ if (!pfr_pool_get(rpool->cur->addr.p.tbl,
+ &rpool->tblidx, &rpool->counter,
+ &raddr, &rmask, af))
+ goto get_addr;
+ } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
+ if (!pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
+ &rpool->tblidx, &rpool->counter,
+ &raddr, &rmask, af))
+ goto get_addr;
+ } else if (pf_match_addr(0, raddr, rmask, &rpool->counter, af))
+ goto get_addr;
+
+ try_next:
+ if ((rpool->cur = TAILQ_NEXT(rpool->cur, entries)) == NULL)
+ rpool->cur = TAILQ_FIRST(&rpool->list);
+ if (rpool->cur->addr.type == PF_ADDR_TABLE) {
+ rpool->tblidx = -1;
+ if (pfr_pool_get(rpool->cur->addr.p.tbl,
+ &rpool->tblidx, &rpool->counter,
+ &raddr, &rmask, af)) {
+ /* table contains no address of type 'af' */
+ if (rpool->cur != acur)
+ goto try_next;
+ return (1);
+ }
+ } else if (rpool->cur->addr.type == PF_ADDR_DYNIFTL) {
+ rpool->tblidx = -1;
+ if (pfr_pool_get(rpool->cur->addr.p.dyn->pfid_kt,
+ &rpool->tblidx, &rpool->counter,
+ &raddr, &rmask, af)) {
+ /* table contains no address of type 'af' */
+ if (rpool->cur != acur)
+ goto try_next;
+ return (1);
+ }
+ } else {
+ raddr = &rpool->cur->addr.v.a.addr;
+ rmask = &rpool->cur->addr.v.a.mask;
+ PF_ACPY(&rpool->counter, raddr, af);
+ }
+
+ get_addr:
+ PF_ACPY(naddr, &rpool->counter, af);
+ if (init_addr != NULL && PF_AZERO(init_addr, af))
+ PF_ACPY(init_addr, naddr, af);
+ PF_AINC(&rpool->counter, af);
+ break;
+ }
+ if (*sn != NULL)
+ PF_ACPY(&(*sn)->raddr, naddr, af);
+
+ if (pf_status.debug >= PF_DEBUG_MISC &&
+ (rpool->opts & PF_POOL_TYPEMASK) != PF_POOL_NONE) {
+ printf("pf_map_addr: selected address ");
+ pf_print_host(naddr, 0, af);
+ printf("\n");
+ }
+
+ return (0);
+}
+
+#ifndef NO_APPLE_EXTENSIONS
+static int
+pf_get_sport(struct pf_pdesc *pd, struct pfi_kif *kif, struct pf_rule *r,
+ struct pf_addr *saddr, union pf_state_xport *sxport, struct pf_addr *daddr,
+ union pf_state_xport *dxport, struct pf_addr *naddr,
+ union pf_state_xport *nxport, struct pf_src_node **sn)
+#else
+int
+pf_get_sport(sa_family_t af, u_int8_t proto, struct pf_rule *r,
+ struct pf_addr *saddr, struct pf_addr *daddr, u_int16_t dport,
+ struct pf_addr *naddr, u_int16_t *nport, u_int16_t low, u_int16_t high,
+ struct pf_src_node **sn)
+#endif
+{
+#pragma unused(kif)
+ struct pf_state_key_cmp key;
+ struct pf_addr init_addr;
+#ifndef NO_APPLE_EXTENSIONS
+ unsigned int cut;
+ sa_family_t af = pd->af;
+ u_int8_t proto = pd->proto;
+ unsigned int low = ntohs(r->rpool.proxy_port[0]);
+ unsigned int high = ntohs(r->rpool.proxy_port[1]);
+#else
+ u_int16_t cut;
+#endif
+
+ bzero(&init_addr, sizeof (init_addr));
+ if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
+ return (1);
+
+ if (proto == IPPROTO_ICMP) {
+ low = 1;
+ high = 65535;
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (!nxport)
+ return (0); /* No output necessary. */
+
+ /*--- Special mapping rules for UDP ---*/
+ if (proto == IPPROTO_UDP) {
+
+ /*--- Never float IKE source port ---*/
+ if (sxport->port == PF_IKE_PORT) {
+ nxport->port = sxport->port;
+ return (0);
+ }
+
+ /*--- Apply exterior mapping options ---*/
+ if (r->extmap > PF_EXTMAP_APD) {
+ struct pf_state *s;
+
+ TAILQ_FOREACH(s, &state_list, entry_list) {
+ struct pf_state_key *sk = s->state_key;
+ if (!sk)
+ continue;
+ if (s->nat_rule.ptr != r)
+ continue;
+ if (sk->proto != IPPROTO_UDP || sk->af != af)
+ continue;
+ if (sk->lan.xport.port != sxport->port)
+ continue;
+ if (PF_ANEQ(&sk->lan.addr, saddr, af))
+ continue;
+ if (r->extmap < PF_EXTMAP_EI &&
+ PF_ANEQ(&sk->ext.addr, daddr, af))
+ continue;
+
+ nxport->port = sk->gwy.xport.port;
+ return (0);
+ }
+ }
+ }
+#endif
+
+ do {
+ key.af = af;
+ key.proto = proto;
+ PF_ACPY(&key.ext.addr, daddr, key.af);
+ PF_ACPY(&key.gwy.addr, naddr, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ switch (proto) {
+ case IPPROTO_UDP:
+ key.proto_variant = r->extfilter;
+ break;
+ default:
+ key.proto_variant = 0;
+ break;
+ }
+ if (dxport)
+ key.ext.xport = *dxport;
+ else
+ memset(&key.ext.xport, 0, sizeof (key.ext.xport));
+#else
+ key.ext.port = dport;
+#endif
+
+ /*
+ * port search; start random, step;
+ * similar 2 portloop in in_pcbbind
+ */
+ if (!(proto == IPPROTO_TCP || proto == IPPROTO_UDP ||
+ proto == IPPROTO_ICMP)) {
+#ifndef NO_APPLE_EXTENSIONS
+ if (dxport)
+ key.gwy.xport = *dxport;
+ else
+ memset(&key.gwy.xport, 0,
+ sizeof (key.ext.xport));
+#else
+ key.gwy.port = dport;
+#endif
+ if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
+ return (0);
+ } else if (low == 0 && high == 0) {
+#ifndef NO_APPLE_EXTENSIONS
+ key.gwy.xport = *nxport;
+#else
+ key.gwy.port = *nport;
+#endif
+ if (pf_find_state_all(&key, PF_IN, NULL) == NULL)
+ return (0);
+ } else if (low == high) {
+#ifndef NO_APPLE_EXTENSIONS
+ key.gwy.xport.port = htons(low);
+ if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
+ nxport->port = htons(low);
+ return (0);
+ }
+#else
+ key.gwy.port = htons(low);
+ if (pf_find_state_all(&key, PF_IN, NULL) == NULL) {
+ *nport = htons(low);
+ return (0);
+ }
+#endif
+ } else {
+#ifndef NO_APPLE_EXTENSIONS
+ unsigned int tmp;
+#else
+ u_int16_t tmp;
+#endif
+ if (low > high) {
+ tmp = low;
+ low = high;
+ high = tmp;
+ }
+ /* low < high */
+ cut = htonl(random()) % (1 + high - low) + low;
+ /* low <= cut <= high */
+ for (tmp = cut; tmp <= high; ++(tmp)) {
+#ifndef NO_APPLE_EXTENSIONS
+ key.gwy.xport.port = htons(tmp);
+ if (pf_find_state_all(&key, PF_IN, NULL) ==
+ NULL) {
+ nxport->port = htons(tmp);
+ return (0);
+ }
+#else
+ key.gwy.port = htons(tmp);
+ if (pf_find_state_all(&key, PF_IN, NULL) ==
+ NULL) {
+ *nport = htons(tmp);
+ return (0);
+ }
+#endif
+ }
+ for (tmp = cut - 1; tmp >= low; --(tmp)) {
+#ifndef NO_APPLE_EXTENSIONS
+ key.gwy.xport.port = htons(tmp);
+ if (pf_find_state_all(&key, PF_IN, NULL) ==
+ NULL) {
+ nxport->port = htons(tmp);
+ return (0);
+ }
+#else
+ key.gwy.port = htons(tmp);
+ if (pf_find_state_all(&key, PF_IN, NULL) ==
+ NULL) {
+ *nport = htons(tmp);
+ return (0);
+ }
+#endif
+ }
+ }
+
+ switch (r->rpool.opts & PF_POOL_TYPEMASK) {
+ case PF_POOL_RANDOM:
+ case PF_POOL_ROUNDROBIN:
+ if (pf_map_addr(af, r, saddr, naddr, &init_addr, sn))
+ return (1);
+ break;
+ case PF_POOL_NONE:
+ case PF_POOL_SRCHASH:
+ case PF_POOL_BITMASK:
+ default:
+ return (1);
+ }
+ } while (!PF_AEQ(&init_addr, naddr, af));
+
+ return (1); /* none available */
+}
+
+#ifndef NO_APPLE_EXTENSIONS
+static struct pf_rule *
+pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
+ int direction, struct pfi_kif *kif, struct pf_addr *saddr,
+ union pf_state_xport *sxport, struct pf_addr *daddr,
+ union pf_state_xport *dxport, int rs_num)
+#else
+struct pf_rule *
+pf_match_translation(struct pf_pdesc *pd, struct mbuf *m, int off,
+ int direction, struct pfi_kif *kif, struct pf_addr *saddr, u_int16_t sport,
+ struct pf_addr *daddr, u_int16_t dport, int rs_num)
+#endif
+{
+ struct pf_rule *r, *rm = NULL;
+ struct pf_ruleset *ruleset = NULL;
+ int tag = -1;
+ unsigned int rtableid = IFSCOPE_NONE;
+ int asd = 0;
+
+ r = TAILQ_FIRST(pf_main_ruleset.rules[rs_num].active.ptr);
+ while (r && rm == NULL) {
+ struct pf_rule_addr *src = NULL, *dst = NULL;
+ struct pf_addr_wrap *xdst = NULL;
+#ifndef NO_APPLE_EXTENSIONS
+ struct pf_addr_wrap *xsrc = NULL;
+#endif
+
+ if (r->action == PF_BINAT && direction == PF_IN) {
+ src = &r->dst;
+ if (r->rpool.cur != NULL)
+ xdst = &r->rpool.cur->addr;
+#ifndef NO_APPLE_EXTENSIONS
+ } else if (r->action == PF_RDR && direction == PF_OUT) {
+ dst = &r->src;
+ src = &r->dst;
+ if (r->rpool.cur != NULL)
+ xsrc = &r->rpool.cur->addr;
+#endif
+ } else {
+ src = &r->src;
+ dst = &r->dst;
+ }
+
+ r->evaluations++;
+ if (pfi_kif_match(r->kif, kif) == r->ifnot)
+ r = r->skip[PF_SKIP_IFP].ptr;
+ else if (r->direction && r->direction != direction)
+ r = r->skip[PF_SKIP_DIR].ptr;
+ else if (r->af && r->af != pd->af)
+ r = r->skip[PF_SKIP_AF].ptr;
+ else if (r->proto && r->proto != pd->proto)
+ r = r->skip[PF_SKIP_PROTO].ptr;
+#ifndef NO_APPLE_EXTENSIONS
+ else if (xsrc && PF_MISMATCHAW(xsrc, saddr, pd->af, 0, NULL))
+ r = TAILQ_NEXT(r, entries);
+ else if (!xsrc && PF_MISMATCHAW(&src->addr, saddr, pd->af,
+ src->neg, kif))
+ r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
+ PF_SKIP_DST_ADDR].ptr;
+ else if (!pf_match_xport(r->proto, r->proto_variant, &src->xport,
+ sxport))
+#else
+ else if (PF_MISMATCHAW(&src->addr, saddr, pd->af,
+ src->neg, kif))
+ r = r->skip[src == &r->src ? PF_SKIP_SRC_ADDR :
+ PF_SKIP_DST_ADDR].ptr;
+ else if (src->port_op && !pf_match_port(src->port_op,
+ src->port[0], src->port[1], sport))
+#endif
+ r = r->skip[src == &r->src ? PF_SKIP_SRC_PORT :
+ PF_SKIP_DST_PORT].ptr;
+ else if (dst != NULL &&
+ PF_MISMATCHAW(&dst->addr, daddr, pd->af, dst->neg, NULL))
+ r = r->skip[PF_SKIP_DST_ADDR].ptr;
+ else if (xdst != NULL && PF_MISMATCHAW(xdst, daddr, pd->af,
+ 0, NULL))
+ r = TAILQ_NEXT(r, entries);
+#ifndef NO_APPLE_EXTENSIONS
+ else if (dst && !pf_match_xport(r->proto, r->proto_variant,
+ &dst->xport, dxport))
+#else
+ else if (dst != NULL && dst->port_op &&
+ !pf_match_port(dst->port_op, dst->port[0],
+ dst->port[1], dport))
+#endif
+ r = r->skip[PF_SKIP_DST_PORT].ptr;
+ else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->os_fingerprint != PF_OSFP_ANY && (pd->proto !=
+ IPPROTO_TCP || !pf_osfp_match(pf_osfp_fingerprint(pd, m,
+ off, pd->hdr.tcp), r->os_fingerprint)))
+ r = TAILQ_NEXT(r, entries);
+ else {
+ if (r->tag)
+ tag = r->tag;
+ if (PF_RTABLEID_IS_VALID(r->rtableid))
+ rtableid = r->rtableid;
+ if (r->anchor == NULL) {
+ rm = r;
+ } else
+ pf_step_into_anchor(&asd, &ruleset, rs_num,
+ &r, NULL, NULL);
+ }
+ if (r == NULL)
+ pf_step_out_of_anchor(&asd, &ruleset, rs_num, &r,
+ NULL, NULL);
+ }
+ if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid))
+ return (NULL);
+ if (rm != NULL && (rm->action == PF_NONAT ||
+ rm->action == PF_NORDR || rm->action == PF_NOBINAT))
+ return (NULL);
+ return (rm);
+}
+
+#ifndef NO_APPLE_EXTENSIONS
+static struct pf_rule *
+pf_get_translation_aux(struct pf_pdesc *pd, struct mbuf *m, int off,
+ int direction, struct pfi_kif *kif, struct pf_src_node **sn,
+ struct pf_addr *saddr, union pf_state_xport *sxport, struct pf_addr *daddr,
+ union pf_state_xport *dxport, struct pf_addr *naddr,
+ union pf_state_xport *nxport)
+#else
+struct pf_rule *
+pf_get_translation(struct pf_pdesc *pd, struct mbuf *m, int off, int direction,
+ struct pfi_kif *kif, struct pf_src_node **sn,
+ struct pf_addr *saddr, u_int16_t sport,
+ struct pf_addr *daddr, u_int16_t dport,
+ struct pf_addr *naddr, u_int16_t *nport)
+#endif
+{
+ struct pf_rule *r = NULL;
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (direction == PF_OUT) {
+ r = pf_match_translation(pd, m, off, direction, kif, saddr,
+ sxport, daddr, dxport, PF_RULESET_BINAT);
+ if (r == NULL)
+ r = pf_match_translation(pd, m, off, direction, kif,
+ saddr, sxport, daddr, dxport, PF_RULESET_RDR);
+ if (r == NULL)
+ r = pf_match_translation(pd, m, off, direction, kif,
+ saddr, sxport, daddr, dxport, PF_RULESET_NAT);
+ } else {
+ r = pf_match_translation(pd, m, off, direction, kif, saddr,
+ sxport, daddr, dxport, PF_RULESET_RDR);
+ if (r == NULL)
+ r = pf_match_translation(pd, m, off, direction, kif,
+ saddr, sxport, daddr, dxport, PF_RULESET_BINAT);
+ }
+#else
+ if (direction == PF_OUT) {
+ r = pf_match_translation(pd, m, off, direction, kif, saddr,
+ sport, daddr, dport, PF_RULESET_BINAT);
+ if (r == NULL)
+ r = pf_match_translation(pd, m, off, direction, kif,
+ saddr, sport, daddr, dport, PF_RULESET_NAT);
+ } else {
+ r = pf_match_translation(pd, m, off, direction, kif, saddr,
+ sport, daddr, dport, PF_RULESET_RDR);
+ if (r == NULL)
+ r = pf_match_translation(pd, m, off, direction, kif,
+ saddr, sport, daddr, dport, PF_RULESET_BINAT);
+ }
+#endif
+
+ if (r != NULL) {
+ switch (r->action) {
+ case PF_NONAT:
+ case PF_NOBINAT:
+ case PF_NORDR:
+ return (NULL);
+ case PF_NAT:
+#ifndef NO_APPLE_EXTENSIONS
+ if (pf_get_sport(pd, kif, r, saddr, sxport, daddr,
+ dxport, naddr, nxport, sn)) {
+#else
+ if (pf_get_sport(pd->af, pd->proto, r, saddr,
+ daddr, dport, naddr, nport, r->rpool.proxy_port[0],
+ r->rpool.proxy_port[1], sn)) {
+#endif
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: NAT proxy port allocation "
+ "(%u-%u) failed\n",
+ r->rpool.proxy_port[0],
+ r->rpool.proxy_port[1]));
+ return (NULL);
+ }
+ break;
+ case PF_BINAT:
+ switch (direction) {
+ case PF_OUT:
+ if (r->rpool.cur->addr.type ==
+ PF_ADDR_DYNIFTL) {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ if (r->rpool.cur->addr.p.dyn->
+ pfid_acnt4 < 1)
+ return (NULL);
+ PF_POOLMASK(naddr,
+ &r->rpool.cur->addr.p.dyn->
+ pfid_addr4,
+ &r->rpool.cur->addr.p.dyn->
+ pfid_mask4,
+ saddr, AF_INET);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (r->rpool.cur->addr.p.dyn->
+ pfid_acnt6 < 1)
+ return (NULL);
+ PF_POOLMASK(naddr,
+ &r->rpool.cur->addr.p.dyn->
+ pfid_addr6,
+ &r->rpool.cur->addr.p.dyn->
+ pfid_mask6,
+ saddr, AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ } else {
+ PF_POOLMASK(naddr,
+ &r->rpool.cur->addr.v.a.addr,
+ &r->rpool.cur->addr.v.a.mask,
+ saddr, pd->af);
+ }
+ break;
+ case PF_IN:
+ if (r->src.addr.type == PF_ADDR_DYNIFTL) {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ if (r->src.addr.p.dyn->
+ pfid_acnt4 < 1)
+ return (NULL);
+ PF_POOLMASK(naddr,
+ &r->src.addr.p.dyn->
+ pfid_addr4,
+ &r->src.addr.p.dyn->
+ pfid_mask4,
+ daddr, AF_INET);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (r->src.addr.p.dyn->
+ pfid_acnt6 < 1)
+ return (NULL);
+ PF_POOLMASK(naddr,
+ &r->src.addr.p.dyn->
+ pfid_addr6,
+ &r->src.addr.p.dyn->
+ pfid_mask6,
+ daddr, AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ } else
+ PF_POOLMASK(naddr,
+ &r->src.addr.v.a.addr,
+ &r->src.addr.v.a.mask, daddr,
+ pd->af);
+ break;
+ }
+ break;
+ case PF_RDR: {
+#ifndef NO_APPLE_EXTENSIONS
+ switch (direction) {
+ case PF_OUT:
+ if (r->dst.addr.type == PF_ADDR_DYNIFTL) {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ if (r->dst.addr.p.dyn->
+ pfid_acnt4 < 1)
+ return (NULL);
+ PF_POOLMASK(naddr,
+ &r->dst.addr.p.dyn->
+ pfid_addr4,
+ &r->dst.addr.p.dyn->
+ pfid_mask4,
+ daddr, AF_INET);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (r->dst.addr.p.dyn->
+ pfid_acnt6 < 1)
+ return (NULL);
+ PF_POOLMASK(naddr,
+ &r->dst.addr.p.dyn->
+ pfid_addr6,
+ &r->dst.addr.p.dyn->
+ pfid_mask6,
+ daddr, AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ } else {
+ PF_POOLMASK(naddr,
+ &r->dst.addr.v.a.addr,
+ &r->dst.addr.v.a.mask,
+ daddr, pd->af);
+ }
+ if (nxport && dxport)
+ *nxport = *sxport;
+ break;
+ case PF_IN:
+ if (pf_map_addr(pd->af, r, saddr,
+ naddr, NULL, sn))
+ return (NULL);
+ if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
+ PF_POOL_BITMASK)
+ PF_POOLMASK(naddr, naddr,
+ &r->rpool.cur->addr.v.a.mask, daddr,
+ pd->af);
+
+ if (nxport && dxport) {
+ if (r->rpool.proxy_port[1]) {
+ u_int32_t tmp_nport;
+
+ tmp_nport =
+ ((ntohs(dxport->port) -
+ ntohs(r->dst.xport.range.
+ port[0])) %
+ (r->rpool.proxy_port[1] -
+ r->rpool.proxy_port[0] +
+ 1)) + r->rpool.proxy_port[0];
+
+ /* wrap around if necessary */
+ if (tmp_nport > 65535)
+ tmp_nport -= 65535;
+ nxport->port =
+ htons((u_int16_t)tmp_nport);
+ } else if (r->rpool.proxy_port[0]) {
+ nxport->port = htons(r->rpool.
+ proxy_port[0]);
+ }
+ }
+ break;
+ }
+#else
+ if (pf_map_addr(pd->af, r, saddr, naddr, NULL, sn))
+ return (NULL);
+ if ((r->rpool.opts & PF_POOL_TYPEMASK) ==
+ PF_POOL_BITMASK)
+ PF_POOLMASK(naddr, naddr,
+ &r->rpool.cur->addr.v.a.mask, daddr,
+ pd->af);
+
+ if (r->rpool.proxy_port[1]) {
+ u_int32_t tmp_nport;
+
+ tmp_nport = ((ntohs(dport) -
+ ntohs(r->dst.port[0])) %
+ (r->rpool.proxy_port[1] -
+ r->rpool.proxy_port[0] + 1)) +
+ r->rpool.proxy_port[0];
+
+ /* wrap around if necessary */
+ if (tmp_nport > 65535)
+ tmp_nport -= 65535;
+ *nport = htons((u_int16_t)tmp_nport);
+ } else if (r->rpool.proxy_port[0])
+ *nport = htons(r->rpool.proxy_port[0]);
+#endif
+ break;
+ }
+ default:
+ return (NULL);
+ }
+ }
+
+ return (r);
+}
+
+int
+pf_socket_lookup(int direction, struct pf_pdesc *pd)
+{
+ struct pf_addr *saddr, *daddr;
+ u_int16_t sport, dport;
+ struct inpcbinfo *pi;
+ struct inpcb *inp = NULL;
+
+ if (pd == NULL)
+ return (-1);
+ pd->lookup.uid = UID_MAX;
+ pd->lookup.gid = GID_MAX;
+ pd->lookup.pid = NO_PID;
+
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+ if (pd->hdr.tcp == NULL)
+ return (-1);
+ sport = pd->hdr.tcp->th_sport;
+ dport = pd->hdr.tcp->th_dport;
+ pi = &tcbinfo;
+ break;
+ case IPPROTO_UDP:
+ if (pd->hdr.udp == NULL)
+ return (-1);
+ sport = pd->hdr.udp->uh_sport;
+ dport = pd->hdr.udp->uh_dport;
+ pi = &udbinfo;
+ break;
+ default:
+ return (-1);
+ }
+ if (direction == PF_IN) {
+ saddr = pd->src;
+ daddr = pd->dst;
+ } else {
+ u_int16_t p;
+
+ p = sport;
+ sport = dport;
+ dport = p;
+ saddr = pd->dst;
+ daddr = pd->src;
+ }
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ inp = in_pcblookup_hash(pi, saddr->v4, sport, daddr->v4, dport,
+ 0, NULL);
+ if (inp == NULL) {
+ inp = in_pcblookup_hash(pi, saddr->v4, sport,
+ daddr->v4, dport, INPLOOKUP_WILDCARD, NULL);
+ if (inp == NULL)
+ return (-1);
+ }
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ inp = in6_pcblookup_hash(pi, &saddr->v6, sport, &daddr->v6,
+ dport, 0, NULL);
+ if (inp == NULL) {
+ inp = in6_pcblookup_hash(pi, &saddr->v6, sport,
+ &daddr->v6, dport, INPLOOKUP_WILDCARD, NULL);
+ if (inp == NULL)
+ return (-1);
+ }
+ break;
+#endif /* INET6 */
+
+ default:
+ return (-1);
+ }
+
+ if (inp != NULL)
+ in_pcb_checkstate(inp, WNT_RELEASE, 0);
+
+ return (1);
+}
+
+static u_int8_t
+pf_get_wscale(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
+{
+ int hlen;
+ u_int8_t hdr[60];
+ u_int8_t *opt, optlen;
+ u_int8_t wscale = 0;
+
+ hlen = th_off << 2; /* hlen <= sizeof (hdr) */
+ if (hlen <= (int)sizeof (struct tcphdr))
+ return (0);
+ if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
+ return (0);
+ opt = hdr + sizeof (struct tcphdr);
+ hlen -= sizeof (struct tcphdr);
+ while (hlen >= 3) {
+ switch (*opt) {
+ case TCPOPT_EOL:
+ case TCPOPT_NOP:
+ ++opt;
+ --hlen;
+ break;
+ case TCPOPT_WINDOW:
+ wscale = opt[2];
+ if (wscale > TCP_MAX_WINSHIFT)
+ wscale = TCP_MAX_WINSHIFT;
+ wscale |= PF_WSCALE_FLAG;
+ /* FALLTHROUGH */
+ default:
+ optlen = opt[1];
+ if (optlen < 2)
+ optlen = 2;
+ hlen -= optlen;
+ opt += optlen;
+ break;
+ }
+ }
+ return (wscale);
+}
+
+static u_int16_t
+pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
+{
+ int hlen;
+ u_int8_t hdr[60];
+ u_int8_t *opt, optlen;
+ u_int16_t mss = tcp_mssdflt;
+
+ hlen = th_off << 2; /* hlen <= sizeof (hdr) */
+ if (hlen <= (int)sizeof (struct tcphdr))
+ return (0);
+ if (!pf_pull_hdr(m, off, hdr, hlen, NULL, NULL, af))
+ return (0);
+ opt = hdr + sizeof (struct tcphdr);
+ hlen -= sizeof (struct tcphdr);
+ while (hlen >= TCPOLEN_MAXSEG) {
+ switch (*opt) {
+ case TCPOPT_EOL:
+ case TCPOPT_NOP:
+ ++opt;
+ --hlen;
+ break;
+ case TCPOPT_MAXSEG:
+ bcopy((caddr_t)(opt + 2), (caddr_t)&mss, 2);
+#if BYTE_ORDER != BIG_ENDIAN
+ NTOHS(mss);
+#endif
+ /* FALLTHROUGH */
+ default:
+ optlen = opt[1];
+ if (optlen < 2)
+ optlen = 2;
+ hlen -= optlen;
+ opt += optlen;
+ break;
+ }
+ }
+ return (mss);
+}
+
+static u_int16_t
+pf_calc_mss(struct pf_addr *addr, sa_family_t af, u_int16_t offer)
+{
+#if INET
+ struct sockaddr_in *dst;
+ struct route ro;
+#endif /* INET */
+#if INET6
+ struct sockaddr_in6 *dst6;
+ struct route_in6 ro6;
+#endif /* INET6 */
+ struct rtentry *rt = NULL;
+ int hlen;
+ u_int16_t mss = tcp_mssdflt;
+
+ switch (af) {
+#if INET
+ case AF_INET:
+ hlen = sizeof (struct ip);
+ bzero(&ro, sizeof (ro));
+ dst = (struct sockaddr_in *)&ro.ro_dst;
+ dst->sin_family = AF_INET;
+ dst->sin_len = sizeof (*dst);
+ dst->sin_addr = addr->v4;
+ rtalloc(&ro);
+ rt = ro.ro_rt;
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ hlen = sizeof (struct ip6_hdr);
+ bzero(&ro6, sizeof (ro6));
+ dst6 = (struct sockaddr_in6 *)&ro6.ro_dst;
+ dst6->sin6_family = AF_INET6;
+ dst6->sin6_len = sizeof (*dst6);
+ dst6->sin6_addr = addr->v6;
+ rtalloc((struct route *)&ro);
+ rt = ro6.ro_rt;
+ break;
+#endif /* INET6 */
+ default:
+ panic("pf_calc_mss: not AF_INET or AF_INET6!");
+ return (0);
+ }
+
+ if (rt && rt->rt_ifp) {
+ mss = rt->rt_ifp->if_mtu - hlen - sizeof (struct tcphdr);
+ mss = max(tcp_mssdflt, mss);
+ RTFREE(rt);
+ }
+ mss = min(mss, offer);
+ mss = max(mss, 64); /* sanity - at least max opt space */
+ return (mss);
+}
+
+static void
+pf_set_rt_ifp(struct pf_state *s, struct pf_addr *saddr)
+{
+ struct pf_rule *r = s->rule.ptr;
+
+ s->rt_kif = NULL;
+ if (!r->rt || r->rt == PF_FASTROUTE)
+ return;
+ switch (s->state_key->af) {
+#if INET
+ case AF_INET:
+ pf_map_addr(AF_INET, r, saddr, &s->rt_addr, NULL,
+ &s->nat_src_node);
+ s->rt_kif = r->rpool.cur->kif;
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ pf_map_addr(AF_INET6, r, saddr, &s->rt_addr, NULL,
+ &s->nat_src_node);
+ s->rt_kif = r->rpool.cur->kif;
+ break;
+#endif /* INET6 */
+ }
+}
+
+static void
+pf_attach_state(struct pf_state_key *sk, struct pf_state *s, int tail)
+{
+ s->state_key = sk;
+ sk->refcnt++;
+
+ /* list is sorted, if-bound states before floating */
+ if (tail)
+ TAILQ_INSERT_TAIL(&sk->states, s, next);
+ else
+ TAILQ_INSERT_HEAD(&sk->states, s, next);
+}
+
+static void
+pf_detach_state(struct pf_state *s, int flags)
+{
+ struct pf_state_key *sk = s->state_key;
+
+ if (sk == NULL)
+ return;
+
+ s->state_key = NULL;
+ TAILQ_REMOVE(&sk->states, s, next);
+ if (--sk->refcnt == 0) {
+ if (!(flags & PF_DT_SKIP_EXTGWY))
+ RB_REMOVE(pf_state_tree_ext_gwy,
+ &pf_statetbl_ext_gwy, sk);
+ if (!(flags & PF_DT_SKIP_LANEXT))
+ RB_REMOVE(pf_state_tree_lan_ext,
+ &pf_statetbl_lan_ext, sk);
+#ifndef NO_APPLE_EXTENSIONS
+ if (sk->app_state)
+ pool_put(&pf_app_state_pl, sk->app_state);
+#endif
+ pool_put(&pf_state_key_pl, sk);
+ }
+}
+
+struct pf_state_key *
+pf_alloc_state_key(struct pf_state *s)
+{
+ struct pf_state_key *sk;
+
+ if ((sk = pool_get(&pf_state_key_pl, PR_WAITOK)) == NULL)
+ return (NULL);
+ bzero(sk, sizeof (*sk));
+ TAILQ_INIT(&sk->states);
+ pf_attach_state(sk, s, 0);
+
+ return (sk);
+}
+
+static u_int32_t
+pf_tcp_iss(struct pf_pdesc *pd)
+{
+ MD5_CTX ctx;
+ u_int32_t digest[4];
+
+ if (pf_tcp_secret_init == 0) {
+ read_random(pf_tcp_secret, sizeof (pf_tcp_secret));
+ MD5Init(&pf_tcp_secret_ctx);
+ MD5Update(&pf_tcp_secret_ctx, pf_tcp_secret,
+ sizeof (pf_tcp_secret));
+ pf_tcp_secret_init = 1;
+ }
+ ctx = pf_tcp_secret_ctx;
+
+ MD5Update(&ctx, (char *)&pd->hdr.tcp->th_sport, sizeof (u_short));
+ MD5Update(&ctx, (char *)&pd->hdr.tcp->th_dport, sizeof (u_short));
+ if (pd->af == AF_INET6) {
+ MD5Update(&ctx, (char *)&pd->src->v6, sizeof (struct in6_addr));
+ MD5Update(&ctx, (char *)&pd->dst->v6, sizeof (struct in6_addr));
+ } else {
+ MD5Update(&ctx, (char *)&pd->src->v4, sizeof (struct in_addr));
+ MD5Update(&ctx, (char *)&pd->dst->v4, sizeof (struct in_addr));
+ }
+ MD5Final((u_char *)digest, &ctx);
+ pf_tcp_iss_off += 4096;
+ return (digest[0] + random() + pf_tcp_iss_off);
+}
+
+static int
+pf_test_rule(struct pf_rule **rm, struct pf_state **sm, int direction,
+ struct pfi_kif *kif, struct mbuf *m, int off, void *h,
+ struct pf_pdesc *pd, struct pf_rule **am, struct pf_ruleset **rsm,
+ struct ifqueue *ifq)
+{
+#pragma unused(h)
+ struct pf_rule *nr = NULL;
+ struct pf_addr *saddr = pd->src, *daddr = pd->dst;
+#ifdef NO_APPLE_EXTENSIONS
+ u_int16_t bport, nport = 0;
+#endif
+ sa_family_t af = pd->af;
+ struct pf_rule *r, *a = NULL;
+ struct pf_ruleset *ruleset = NULL;
+ struct pf_src_node *nsn = NULL;
+ struct tcphdr *th = pd->hdr.tcp;
+ u_short reason;
+ int rewrite = 0, hdrlen = 0;
+ int tag = -1;
+ unsigned int rtableid = IFSCOPE_NONE;
+ int asd = 0;
+ int match = 0;
+ int state_icmp = 0;
+ u_int16_t mss = tcp_mssdflt;
+#ifdef NO_APPLE_EXTENSIONS
+ u_int16_t sport, dport;
+#endif
+ u_int8_t icmptype = 0, icmpcode = 0;
+
+#ifndef NO_APPLE_EXTENSIONS
+ struct pf_grev1_hdr *grev1 = pd->hdr.grev1;
+ union pf_state_xport bxport, nxport, sxport, dxport;
+#endif
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (direction == PF_IN && pf_check_congestion(ifq)) {
+ REASON_SET(&reason, PFRES_CONGEST);
+ return (PF_DROP);
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ hdrlen = 0;
+ sxport.spi = 0;
+ dxport.spi = 0;
+ nxport.spi = 0;
+#else
+ sport = dport = hdrlen = 0;
+#endif
+
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+#ifndef NO_APPLE_EXTENSIONS
+ sxport.port = th->th_sport;
+ dxport.port = th->th_dport;
+#else
+ sport = th->th_sport;
+ dport = th->th_dport;
+#endif
+ hdrlen = sizeof (*th);
+ break;
+ case IPPROTO_UDP:
+#ifndef NO_APPLE_EXTENSIONS
+ sxport.port = pd->hdr.udp->uh_sport;
+ dxport.port = pd->hdr.udp->uh_dport;
+#else
+ sport = pd->hdr.udp->uh_sport;
+ dport = pd->hdr.udp->uh_dport;
+#endif
+ hdrlen = sizeof (*pd->hdr.udp);
+ break;
+#if INET
+ case IPPROTO_ICMP:
+ if (pd->af != AF_INET)
+ break;
+#ifndef NO_APPLE_EXTENSIONS
+ sxport.port = dxport.port = pd->hdr.icmp->icmp_id;
+ hdrlen = ICMP_MINLEN;
+#else
+ sport = dport = pd->hdr.icmp->icmp_id;
+#endif
+ icmptype = pd->hdr.icmp->icmp_type;
+ icmpcode = pd->hdr.icmp->icmp_code;
+
+ if (icmptype == ICMP_UNREACH ||
+ icmptype == ICMP_SOURCEQUENCH ||
+ icmptype == ICMP_REDIRECT ||
+ icmptype == ICMP_TIMXCEED ||
+ icmptype == ICMP_PARAMPROB)
+ state_icmp++;
+ break;
+#endif /* INET */
+#if INET6
+ case IPPROTO_ICMPV6:
+ if (pd->af != AF_INET6)
+ break;
+#ifndef NO_APPLE_EXTENSIONS
+ sxport.port = dxport.port = pd->hdr.icmp6->icmp6_id;
+#else
+ sport = dport = pd->hdr.icmp6->icmp6_id;
+#endif
+ hdrlen = sizeof (*pd->hdr.icmp6);
+ icmptype = pd->hdr.icmp6->icmp6_type;
+ icmpcode = pd->hdr.icmp6->icmp6_code;
+
+ if (icmptype == ICMP6_DST_UNREACH ||
+ icmptype == ICMP6_PACKET_TOO_BIG ||
+ icmptype == ICMP6_TIME_EXCEEDED ||
+ icmptype == ICMP6_PARAM_PROB)
+ state_icmp++;
+ break;
+#endif /* INET6 */
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_GRE:
+ if (pd->proto_variant == PF_GRE_PPTP_VARIANT) {
+ sxport.call_id = dxport.call_id =
+ pd->hdr.grev1->call_id;
+ hdrlen = sizeof (*pd->hdr.grev1);
+ }
+ break;
+ case IPPROTO_ESP:
+ sxport.spi = 0;
+ dxport.spi = pd->hdr.esp->spi;
+ hdrlen = sizeof (*pd->hdr.esp);
+ break;
+#endif
+ }
+
+ r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
+
+ if (direction == PF_OUT) {
+#ifndef NO_APPLE_EXTENSIONS
+ bxport = nxport = sxport;
+ /* check outgoing packet for BINAT/NAT */
+ if ((nr = pf_get_translation_aux(pd, m, off, PF_OUT, kif, &nsn,
+ saddr, &sxport, daddr, &dxport, &pd->naddr, &nxport)) !=
+ NULL) {
+#else
+ bport = nport = sport;
+ /* check outgoing packet for BINAT/NAT */
+ if ((nr = pf_get_translation(pd, m, off, PF_OUT, kif, &nsn,
+ saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) {
+#endif
+ PF_ACPY(&pd->baddr, saddr, af);
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, saddr,
+ &th->th_sport, pd->ip_sum, &th->th_sum,
+ &pd->naddr, nxport.port, 0, af);
+ sxport.port = th->th_sport;
+#else
+ pf_change_ap(saddr, &th->th_sport, pd->ip_sum,
+ &th->th_sum, &pd->naddr, nport, 0, af);
+ sport = th->th_sport;
+#endif
+ rewrite++;
+ break;
+ case IPPROTO_UDP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, saddr,
+ &pd->hdr.udp->uh_sport, pd->ip_sum,
+ &pd->hdr.udp->uh_sum, &pd->naddr,
+ nxport.port, 1, af);
+ sxport.port = pd->hdr.udp->uh_sport;
+#else
+ pf_change_ap(saddr, &pd->hdr.udp->uh_sport,
+ pd->ip_sum, &pd->hdr.udp->uh_sum,
+ &pd->naddr, nport, 1, af);
+ sport = pd->hdr.udp->uh_sport;
+#endif
+ rewrite++;
+ break;
+#if INET
+ case IPPROTO_ICMP:
+ pf_change_a(&saddr->v4.s_addr, pd->ip_sum,
+ pd->naddr.v4.s_addr, 0);
+#ifndef NO_APPLE_EXTENSIONS
+ pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
+ pd->hdr.icmp->icmp_cksum, sxport.port,
+ nxport.port, 0);
+ pd->hdr.icmp->icmp_id = nxport.port;
+ ++rewrite;
+#else
+ pd->hdr.icmp->icmp_cksum = pf_cksum_fixup(
+ pd->hdr.icmp->icmp_cksum, sport, nport, 0);
+ pd->hdr.icmp->icmp_id = nport;
+ m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp);
+#endif
+ break;
+#endif /* INET */
+#if INET6
+ case IPPROTO_ICMPV6:
+ pf_change_a6(saddr, &pd->hdr.icmp6->icmp6_cksum,
+ &pd->naddr, 0);
+ rewrite++;
+ break;
+#endif /* INET */
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_GRE:
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&saddr->v4.s_addr,
+ pd->ip_sum, pd->naddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(saddr, &pd->naddr, AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ ++rewrite;
+ break;
+ case IPPROTO_ESP:
+ bxport.spi = 0;
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&saddr->v4.s_addr,
+ pd->ip_sum, pd->naddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(saddr, &pd->naddr, AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ break;
+#endif
+ default:
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&saddr->v4.s_addr,
+ pd->ip_sum, pd->naddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(saddr, &pd->naddr, af);
+ break;
+#endif /* INET */
+ }
+ break;
+ }
+
+ if (nr->natpass)
+ r = NULL;
+ pd->nat_rule = nr;
+ }
+ } else {
+#ifndef NO_APPLE_EXTENSIONS
+ bxport.port = nxport.port = dxport.port;
+ /* check incoming packet for BINAT/RDR */
+ if ((nr = pf_get_translation_aux(pd, m, off, PF_IN, kif, &nsn,
+ saddr, &sxport, daddr, &dxport, &pd->naddr, &nxport)) !=
+ NULL) {
+#else
+ bport = nport = dport;
+ /* check incoming packet for BINAT/RDR */
+ if ((nr = pf_get_translation(pd, m, off, PF_IN, kif, &nsn,
+ saddr, sport, daddr, dport, &pd->naddr, &nport)) != NULL) {
+#endif
+ PF_ACPY(&pd->baddr, daddr, af);
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, daddr,
+ &th->th_dport, pd->ip_sum, &th->th_sum,
+ &pd->naddr, nxport.port, 0, af);
+ dxport.port = th->th_dport;
+#else
+ pf_change_ap(daddr, &th->th_dport, pd->ip_sum,
+ &th->th_sum, &pd->naddr, nport, 0, af);
+ dport = th->th_dport;
+#endif
+ rewrite++;
+ break;
+ case IPPROTO_UDP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, daddr,
+ &pd->hdr.udp->uh_dport, pd->ip_sum,
+ &pd->hdr.udp->uh_sum, &pd->naddr,
+ nxport.port, 1, af);
+ dxport.port = pd->hdr.udp->uh_dport;
+#else
+ pf_change_ap(direction, daddr,
+ &pd->hdr.udp->uh_dport,
+ pd->ip_sum, &pd->hdr.udp->uh_sum,
+ &pd->naddr, nport, 1, af);
+ dport = pd->hdr.udp->uh_dport;
+#endif
+ rewrite++;
+ break;
+#if INET
+ case IPPROTO_ICMP:
+ pf_change_a(&daddr->v4.s_addr, pd->ip_sum,
+ pd->naddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case IPPROTO_ICMPV6:
+ pf_change_a6(daddr, &pd->hdr.icmp6->icmp6_cksum,
+ &pd->naddr, 0);
+ rewrite++;
+ break;
+#endif /* INET6 */
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_GRE:
+ if (pd->proto_variant == PF_GRE_PPTP_VARIANT)
+ grev1->call_id = nxport.call_id;
+
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&daddr->v4.s_addr,
+ pd->ip_sum, pd->naddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(daddr, &pd->naddr, AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ ++rewrite;
+ break;
+ case IPPROTO_ESP:
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&daddr->v4.s_addr,
+ pd->ip_sum, pd->naddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(daddr, &pd->naddr, AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ break;
+#endif
+ default:
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&daddr->v4.s_addr,
+ pd->ip_sum, pd->naddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(daddr, &pd->naddr, af);
+ break;
+#endif /* INET */
+ }
+ break;
+ }
+
+ if (nr->natpass)
+ r = NULL;
+ pd->nat_rule = nr;
+ }
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (nr && nr->tag > 0)
+ tag = nr->tag;
+#endif
+
+ while (r != NULL) {
+ r->evaluations++;
+ if (pfi_kif_match(r->kif, kif) == r->ifnot)
+ r = r->skip[PF_SKIP_IFP].ptr;
+ else if (r->direction && r->direction != direction)
+ r = r->skip[PF_SKIP_DIR].ptr;
+ else if (r->af && r->af != af)
+ r = r->skip[PF_SKIP_AF].ptr;
+ else if (r->proto && r->proto != pd->proto)
+ r = r->skip[PF_SKIP_PROTO].ptr;
+ else if (PF_MISMATCHAW(&r->src.addr, saddr, af,
+ r->src.neg, kif))
+ r = r->skip[PF_SKIP_SRC_ADDR].ptr;
+ /* tcp/udp only. port_op always 0 in other cases */
+#ifndef NO_APPLE_EXTENSIONS
+ else if (r->proto == pd->proto &&
+ (r->proto == IPPROTO_TCP || r->proto == IPPROTO_UDP) &&
+ r->src.xport.range.op &&
+ !pf_match_port(r->src.xport.range.op,
+ r->src.xport.range.port[0], r->src.xport.range.port[1],
+ th->th_sport))
+#else
+ else if (r->src.port_op && !pf_match_port(r->src.port_op,
+ r->src.port[0], r->src.port[1], th->th_sport))
+#endif
+ r = r->skip[PF_SKIP_SRC_PORT].ptr;
+ else if (PF_MISMATCHAW(&r->dst.addr, daddr, af,
+ r->dst.neg, NULL))
+ r = r->skip[PF_SKIP_DST_ADDR].ptr;
+ /* tcp/udp only. port_op always 0 in other cases */
+#ifndef NO_APPLE_EXTENSIONS
+ else if (r->proto == pd->proto &&
+ (r->proto == IPPROTO_TCP || r->proto == IPPROTO_UDP) &&
+ r->dst.xport.range.op &&
+ !pf_match_port(r->dst.xport.range.op,
+ r->dst.xport.range.port[0], r->dst.xport.range.port[1],
+ th->th_dport))
+#else
+ else if (r->dst.port_op && !pf_match_port(r->dst.port_op,
+ r->dst.port[0], r->dst.port[1], th->th_dport))
+#endif
+ r = r->skip[PF_SKIP_DST_PORT].ptr;
+ /* icmp only. type always 0 in other cases */
+ else if (r->type && r->type != icmptype + 1)
+ r = TAILQ_NEXT(r, entries);
+ /* icmp only. type always 0 in other cases */
+ else if (r->code && r->code != icmpcode + 1)
+ r = TAILQ_NEXT(r, entries);
+ else if (r->tos && !(r->tos == pd->tos))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->rule_flag & PFRULE_FRAGMENT)
+ r = TAILQ_NEXT(r, entries);
+ else if (pd->proto == IPPROTO_TCP &&
+ (r->flagset & th->th_flags) != r->flags)
+ r = TAILQ_NEXT(r, entries);
+ /* tcp/udp only. uid.op always 0 in other cases */
+ else if (r->uid.op && (pd->lookup.done || (pd->lookup.done =
+ pf_socket_lookup(direction, pd), 1)) &&
+ !pf_match_uid(r->uid.op, r->uid.uid[0], r->uid.uid[1],
+ pd->lookup.uid))
+ r = TAILQ_NEXT(r, entries);
+ /* tcp/udp only. gid.op always 0 in other cases */
+ else if (r->gid.op && (pd->lookup.done || (pd->lookup.done =
+ pf_socket_lookup(direction, pd), 1)) &&
+ !pf_match_gid(r->gid.op, r->gid.gid[0], r->gid.gid[1],
+ pd->lookup.gid))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->prob && r->prob <= (random() % (UINT_MAX - 1) + 1))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->os_fingerprint != PF_OSFP_ANY &&
+ (pd->proto != IPPROTO_TCP || !pf_osfp_match(
+ pf_osfp_fingerprint(pd, m, off, th),
+ r->os_fingerprint)))
+ r = TAILQ_NEXT(r, entries);
+ else {
+ if (r->tag)
+ tag = r->tag;
+ if (PF_RTABLEID_IS_VALID(r->rtableid))
+ rtableid = r->rtableid;
+ if (r->anchor == NULL) {
+ match = 1;
+ *rm = r;
+ *am = a;
+ *rsm = ruleset;
+ if ((*rm)->quick)
+ break;
+ r = TAILQ_NEXT(r, entries);
+ } else
+ pf_step_into_anchor(&asd, &ruleset,
+ PF_RULESET_FILTER, &r, &a, &match);
+ }
+ if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
+ PF_RULESET_FILTER, &r, &a, &match))
+ break;
+ }
+ r = *rm;
+ a = *am;
+ ruleset = *rsm;
+
+ REASON_SET(&reason, PFRES_MATCH);
+
+ if (r->log || (nr != NULL && nr->log)) {
+#ifndef NO_APPLE_EXTENSIONS
+ if (rewrite > 0) {
+ if (rewrite < off + hdrlen)
+ rewrite = off + hdrlen;
+
+ m = pf_lazy_makewritable(pd, m, rewrite);
+ if (!m) {
+ REASON_SET(&reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+
+ m_copyback(m, off, hdrlen, pd->hdr.any);
+ }
+#else
+ if (rewrite)
+ m_copyback(m, off, hdrlen, pd->hdr.any);
+#endif
+ PFLOG_PACKET(kif, h, m, af, direction, reason, r->log ? r : nr,
+ a, ruleset, pd);
+ }
+
+ if ((r->action == PF_DROP) &&
+ ((r->rule_flag & PFRULE_RETURNRST) ||
+ (r->rule_flag & PFRULE_RETURNICMP) ||
+ (r->rule_flag & PFRULE_RETURN))) {
+ /* undo NAT changes, if they have taken place */
+ if (nr != NULL) {
+ if (direction == PF_OUT) {
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, saddr,
+ &th->th_sport, pd->ip_sum,
+ &th->th_sum, &pd->baddr,
+ bxport.port, 0, af);
+ sxport.port = th->th_sport;
+#else
+ pf_change_ap(saddr, &th->th_sport,
+ pd->ip_sum, &th->th_sum,
+ &pd->baddr, bport, 0, af);
+ sport = th->th_sport;
+#endif
+ rewrite++;
+ break;
+ case IPPROTO_UDP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, saddr,
+ &pd->hdr.udp->uh_sport, pd->ip_sum,
+ &pd->hdr.udp->uh_sum, &pd->baddr,
+ bxport.port, 1, af);
+ sxport.port = pd->hdr.udp->uh_sport;
+#else
+ pf_change_ap(saddr,
+ &pd->hdr.udp->uh_sport, pd->ip_sum,
+ &pd->hdr.udp->uh_sum, &pd->baddr,
+ bport, 1, af);
+ sport = pd->hdr.udp->uh_sport;
+#endif
+ rewrite++;
+ break;
+ case IPPROTO_ICMP:
+#if INET6
+ case IPPROTO_ICMPV6:
+#endif
+ /* nothing! */
+ break;
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_GRE:
+ PF_ACPY(&pd->baddr, saddr, af);
+ ++rewrite;
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&saddr->v4.s_addr,
+ pd->ip_sum,
+ pd->baddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(saddr, &pd->baddr,
+ AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ break;
+ case IPPROTO_ESP:
+ PF_ACPY(&pd->baddr, saddr, af);
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&saddr->v4.s_addr,
+ pd->ip_sum,
+ pd->baddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(saddr, &pd->baddr,
+ AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ break;
+#endif
+ default:
+ switch (af) {
+ case AF_INET:
+ pf_change_a(&saddr->v4.s_addr,
+ pd->ip_sum,
+ pd->baddr.v4.s_addr, 0);
+ break;
+ case AF_INET6:
+ PF_ACPY(saddr, &pd->baddr, af);
+ break;
+ }
+ }
+ } else {
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, daddr,
+ &th->th_dport, pd->ip_sum,
+ &th->th_sum, &pd->baddr,
+ bxport.port, 0, af);
+ dxport.port = th->th_dport;
+#else
+ pf_change_ap(daddr, &th->th_dport,
+ pd->ip_sum, &th->th_sum,
+ &pd->baddr, bport, 0, af);
+ dport = th->th_dport;
+#endif
+ rewrite++;
+ break;
+ case IPPROTO_UDP:
+#ifndef NO_APPLE_EXTENSIONS
+ pf_change_ap(direction, pd->mp, daddr,
+ &pd->hdr.udp->uh_dport, pd->ip_sum,
+ &pd->hdr.udp->uh_sum, &pd->baddr,
+ bxport.port, 1, af);
+ dxport.port = pd->hdr.udp->uh_dport;
+#else
+ pf_change_ap(daddr,
+ &pd->hdr.udp->uh_dport, pd->ip_sum,
+ &pd->hdr.udp->uh_sum, &pd->baddr,
+ bport, 1, af);
+ dport = pd->hdr.udp->uh_dport;
+#endif
+ rewrite++;
+ break;
+ case IPPROTO_ICMP:
+#if INET6
+ case IPPROTO_ICMPV6:
+#endif
+ /* nothing! */
+ break;
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_GRE:
+ if (pd->proto_variant ==
+ PF_GRE_PPTP_VARIANT)
+ grev1->call_id = bxport.call_id;
+ ++rewrite;
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&daddr->v4.s_addr,
+ pd->ip_sum,
+ pd->baddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(daddr, &pd->baddr,
+ AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ break;
+ case IPPROTO_ESP:
+ switch (af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&daddr->v4.s_addr,
+ pd->ip_sum,
+ pd->baddr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(daddr, &pd->baddr,
+ AF_INET6);
+ break;
+#endif /* INET6 */
+ }
+ break;
+#endif
+ default:
+ switch (af) {
+ case AF_INET:
+ pf_change_a(&daddr->v4.s_addr,
+ pd->ip_sum,
+ pd->baddr.v4.s_addr, 0);
+ break;
+#if INET6
+ case AF_INET6:
+ PF_ACPY(daddr, &pd->baddr, af);
+ break;
+#endif /* INET6 */
+ }
+ }
+ }
+ }
+ if (pd->proto == IPPROTO_TCP &&
+ ((r->rule_flag & PFRULE_RETURNRST) ||
+ (r->rule_flag & PFRULE_RETURN)) &&
+ !(th->th_flags & TH_RST)) {
+ u_int32_t ack = ntohl(th->th_seq) + pd->p_len;
+ int len = 0;
+ struct ip *h4;
+#if INET6
+ struct ip6_hdr *h6;
+#endif /* INET6 */
+
+ switch (af) {
+ case AF_INET:
+ h4 = mtod(m, struct ip *);
+ len = ntohs(h4->ip_len) - off;
+ break;
+#if INET6
+ case AF_INET6:
+ h6 = mtod(m, struct ip6_hdr *);
+ len = ntohs(h6->ip6_plen) -
+ (off - sizeof (*h6));
+ break;
+#endif /* INET6 */
+ }
+
+ if (pf_check_proto_cksum(m, off, len, IPPROTO_TCP, af))
+ REASON_SET(&reason, PFRES_PROTCKSUM);
+ else {
+ if (th->th_flags & TH_SYN)
+ ack++;
+ if (th->th_flags & TH_FIN)
+ ack++;
+ pf_send_tcp(r, af, pd->dst,
+ pd->src, th->th_dport, th->th_sport,
+ ntohl(th->th_ack), ack, TH_RST|TH_ACK, 0, 0,
+ r->return_ttl, 1, 0, pd->eh, kif->pfik_ifp);
+ }
+ } else if (pd->proto != IPPROTO_ICMP && af == AF_INET &&
+#ifndef NO_APPLE_EXTENSIONS
+ pd->proto != IPPROTO_ESP && pd->proto != IPPROTO_AH &&
+#endif
+ r->return_icmp)
+ pf_send_icmp(m, r->return_icmp >> 8,
+ r->return_icmp & 255, af, r);
+ else if (pd->proto != IPPROTO_ICMPV6 && af == AF_INET6 &&
+#ifndef NO_APPLE_EXTENSIONS
+ pd->proto != IPPROTO_ESP && pd->proto != IPPROTO_AH &&
+#endif
+ r->return_icmp6)
+ pf_send_icmp(m, r->return_icmp6 >> 8,
+ r->return_icmp6 & 255, af, r);
+ }
+
+ if (r->action == PF_DROP)
+ return (PF_DROP);
+
+ if (pf_tag_packet(m, pd->pf_mtag, tag, rtableid)) {
+ REASON_SET(&reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+
+ if (!state_icmp && (r->keep_state || nr != NULL ||
+ (pd->flags & PFDESC_TCP_NORM))) {
+ /* create new state */
+ struct pf_state *s = NULL;
+ struct pf_state_key *sk = NULL;
+ struct pf_src_node *sn = NULL;
+#ifndef NO_APPLE_EXTENSIONS
+ struct pf_ike_hdr ike;
+
+ if (pd->proto == IPPROTO_UDP) {
+ struct udphdr *uh = pd->hdr.udp;
+ size_t plen = m->m_pkthdr.len - off - sizeof (*uh);
+
+ if (uh->uh_sport == PF_IKE_PORT &&
+ uh->uh_dport == PF_IKE_PORT &&
+ plen >= PF_IKE_PACKET_MINSIZE) {
+ if (plen > PF_IKE_PACKET_MINSIZE)
+ plen = PF_IKE_PACKET_MINSIZE;
+ m_copydata(m, off + sizeof (*uh), plen, &ike);
+ }
+ }
+
+ if (nr != NULL && pd->proto == IPPROTO_ESP &&
+ direction == PF_OUT) {
+ struct pf_state_key_cmp sk0;
+ struct pf_state *s0;
+
+ /*
+ * <jhw@apple.com>
+ * This squelches state creation if the external
+ * address matches an existing incomplete state with a
+ * different internal address. Only one 'blocking'
+ * partial state is allowed for each external address.
+ */
+ memset(&sk0, 0, sizeof (sk0));
+ sk0.af = pd->af;
+ sk0.proto = IPPROTO_ESP;
+ PF_ACPY(&sk0.gwy.addr, saddr, sk0.af);
+ PF_ACPY(&sk0.ext.addr, daddr, sk0.af);
+ s0 = pf_find_state(kif, &sk0, PF_IN);
+
+ if (s0 && PF_ANEQ(&s0->state_key->lan.addr,
+ pd->src, pd->af)) {
+ nsn = 0;
+ goto cleanup;
+ }
+ }
+#endif
+
+ /* check maximums */
+ if (r->max_states && (r->states >= r->max_states)) {
+ pf_status.lcounters[LCNT_STATES]++;
+ REASON_SET(&reason, PFRES_MAXSTATES);
+ goto cleanup;
+ }
+ /* src node for filter rule */
+ if ((r->rule_flag & PFRULE_SRCTRACK ||
+ r->rpool.opts & PF_POOL_STICKYADDR) &&
+ pf_insert_src_node(&sn, r, saddr, af) != 0) {
+ REASON_SET(&reason, PFRES_SRCLIMIT);
+ goto cleanup;
+ }
+ /* src node for translation rule */
+ if (nr != NULL && (nr->rpool.opts & PF_POOL_STICKYADDR) &&
+ ((direction == PF_OUT &&
+#ifndef NO_APPLE_EXTENSIONS
+ nr->action != PF_RDR &&
+#endif
+ pf_insert_src_node(&nsn, nr, &pd->baddr, af) != 0) ||
+ (pf_insert_src_node(&nsn, nr, saddr, af) != 0))) {
+ REASON_SET(&reason, PFRES_SRCLIMIT);
+ goto cleanup;
+ }
+ s = pool_get(&pf_state_pl, PR_WAITOK);
+ if (s == NULL) {
+ REASON_SET(&reason, PFRES_MEMORY);
+cleanup:
+ if (sn != NULL && sn->states == 0 && sn->expire == 0) {
+ RB_REMOVE(pf_src_tree, &tree_src_tracking, sn);
+ pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
+ pf_status.src_nodes--;
+ pool_put(&pf_src_tree_pl, sn);
+ }
+ if (nsn != sn && nsn != NULL && nsn->states == 0 &&
+ nsn->expire == 0) {
+ RB_REMOVE(pf_src_tree, &tree_src_tracking, nsn);
+ pf_status.scounters[SCNT_SRC_NODE_REMOVALS]++;
+ pf_status.src_nodes--;
+ pool_put(&pf_src_tree_pl, nsn);
+ }
+ if (sk != NULL) {
+#ifndef NO_APPLE_EXTENSIONS
+ if (sk->app_state)
+ pool_put(&pf_app_state_pl,
+ sk->app_state);
+#endif
+ pool_put(&pf_state_key_pl, sk);
+ }
+ return (PF_DROP);
+ }
+ bzero(s, sizeof (*s));
+#ifndef NO_APPLE_EXTENSIONS
+ TAILQ_INIT(&s->unlink_hooks);
+#endif
+ s->rule.ptr = r;
+ s->nat_rule.ptr = nr;
+ if (nr && nr->action == PF_RDR && direction == PF_OUT)
+ s->anchor.ptr = a;
+ STATE_INC_COUNTERS(s);
+ s->allow_opts = r->allow_opts;
+ s->log = r->log & PF_LOG_ALL;
+ if (nr != NULL)
+ s->log |= nr->log & PF_LOG_ALL;
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+ s->src.seqlo = ntohl(th->th_seq);
+ s->src.seqhi = s->src.seqlo + pd->p_len + 1;
+ if ((th->th_flags & (TH_SYN|TH_ACK)) ==
+ TH_SYN && r->keep_state == PF_STATE_MODULATE) {
+ /* Generate sequence number modulator */
+ if ((s->src.seqdiff = pf_tcp_iss(pd) -
+ s->src.seqlo) == 0)
+ s->src.seqdiff = 1;
+ pf_change_a(&th->th_seq, &th->th_sum,
+ htonl(s->src.seqlo + s->src.seqdiff), 0);
+ rewrite = off + sizeof (*th);
+ } else
+ s->src.seqdiff = 0;
+ if (th->th_flags & TH_SYN) {
+ s->src.seqhi++;
+ s->src.wscale = pf_get_wscale(m, off,
+ th->th_off, af);
+ }
+ s->src.max_win = MAX(ntohs(th->th_win), 1);
+ if (s->src.wscale & PF_WSCALE_MASK) {
+ /* Remove scale factor from initial window */
+ int win = s->src.max_win;
+ win += 1 << (s->src.wscale & PF_WSCALE_MASK);
+ s->src.max_win = (win - 1) >>
+ (s->src.wscale & PF_WSCALE_MASK);
+ }
+ if (th->th_flags & TH_FIN)
+ s->src.seqhi++;
+ s->dst.seqhi = 1;
+ s->dst.max_win = 1;
+ s->src.state = TCPS_SYN_SENT;
+ s->dst.state = TCPS_CLOSED;
+ s->timeout = PFTM_TCP_FIRST_PACKET;
+ break;
+ case IPPROTO_UDP:
+ s->src.state = PFUDPS_SINGLE;
+ s->dst.state = PFUDPS_NO_TRAFFIC;
+ s->timeout = PFTM_UDP_FIRST_PACKET;
+ break;
+ case IPPROTO_ICMP:
+#if INET6
+ case IPPROTO_ICMPV6:
+#endif
+ s->timeout = PFTM_ICMP_FIRST_PACKET;
+ break;
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_GRE:
+ s->src.state = PFGRE1S_INITIATING;
+ s->dst.state = PFGRE1S_NO_TRAFFIC;
+ s->timeout = PFTM_GREv1_INITIATING;
+ break;
+ case IPPROTO_ESP:
+ s->src.state = PFESPS_INITIATING;
+ s->dst.state = PFESPS_NO_TRAFFIC;
+ s->timeout = PFTM_ESP_FIRST_PACKET;
+ break;
+#endif
+ default:
+ s->src.state = PFOTHERS_SINGLE;
+ s->dst.state = PFOTHERS_NO_TRAFFIC;
+ s->timeout = PFTM_OTHER_FIRST_PACKET;
+ }
+
+ s->creation = pf_time_second();
+ s->expire = pf_time_second();
+
+ if (sn != NULL) {
+ s->src_node = sn;
+ s->src_node->states++;
+ }
+ if (nsn != NULL) {
+ PF_ACPY(&nsn->raddr, &pd->naddr, af);
+ s->nat_src_node = nsn;
+ s->nat_src_node->states++;
+ }
+ if (pd->proto == IPPROTO_TCP) {
+ if ((pd->flags & PFDESC_TCP_NORM) &&
+ pf_normalize_tcp_init(m, off, pd, th, &s->src,
+ &s->dst)) {
+ REASON_SET(&reason, PFRES_MEMORY);
+ pf_src_tree_remove_state(s);
+ STATE_DEC_COUNTERS(s);
+ pool_put(&pf_state_pl, s);
+ return (PF_DROP);
+ }
+ if ((pd->flags & PFDESC_TCP_NORM) && s->src.scrub &&
+ pf_normalize_tcp_stateful(m, off, pd, &reason,
+ th, s, &s->src, &s->dst, &rewrite)) {
+ /* This really shouldn't happen!!! */
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_normalize_tcp_stateful failed on "
+ "first pkt"));
+ pf_normalize_tcp_cleanup(s);
+ pf_src_tree_remove_state(s);
+ STATE_DEC_COUNTERS(s);
+ pool_put(&pf_state_pl, s);
+ return (PF_DROP);
+ }
+ }
+
+ if ((sk = pf_alloc_state_key(s)) == NULL) {
+ REASON_SET(&reason, PFRES_MEMORY);
+ goto cleanup;
+ }
+
+ sk->proto = pd->proto;
+ sk->direction = direction;
+ sk->af = af;
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd->proto == IPPROTO_UDP) {
+ if (pd->hdr.udp->uh_sport == PF_IKE_PORT &&
+ pd->hdr.udp->uh_dport == PF_IKE_PORT) {
+ sk->proto_variant = PF_EXTFILTER_APD;
+ } else {
+ sk->proto_variant = nr ? nr->extfilter :
+ r->extfilter;
+ if (sk->proto_variant < PF_EXTFILTER_APD)
+ sk->proto_variant = PF_EXTFILTER_APD;
+ }
+ } else if (pd->proto == IPPROTO_GRE) {
+ sk->proto_variant = pd->proto_variant;
+ }
+#endif
+ if (direction == PF_OUT) {
+ PF_ACPY(&sk->gwy.addr, saddr, af);
+ PF_ACPY(&sk->ext.addr, daddr, af);
+ switch (pd->proto) {
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_UDP:
+ sk->gwy.xport = sxport;
+ sk->ext.xport = dxport;
+ break;
+ case IPPROTO_ESP:
+ sk->gwy.xport.spi = 0;
+ sk->ext.xport.spi = pd->hdr.esp->spi;
+ break;
+#endif
+ case IPPROTO_ICMP:
+#if INET6
+ case IPPROTO_ICMPV6:
+#endif
+#ifndef NO_APPLE_EXTENSIONS
+ sk->gwy.xport.port = nxport.port;
+ sk->ext.xport.spi = 0;
+#else
+ sk->gwy.port = nport;
+ sk->ext.port = 0;
+#endif
+ break;
+ default:
+#ifndef NO_APPLE_EXTENSIONS
+ sk->gwy.xport = sxport;
+ sk->ext.xport = dxport;
+ break;
+#else
+ sk->gwy.port = sport;
+ sk->ext.port = dport;
+#endif
+ }
+#ifndef NO_APPLE_EXTENSIONS
+ if (nr != NULL) {
+ PF_ACPY(&sk->lan.addr, &pd->baddr, af);
+ sk->lan.xport = bxport;
+ } else {
+ PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af);
+ sk->lan.xport = sk->gwy.xport;
+ }
+#else
+ if (nr != NULL) {
+ PF_ACPY(&sk->lan.addr, &pd->baddr, af);
+ sk->lan.port = bport;
+ } else {
+ PF_ACPY(&sk->lan.addr, &sk->gwy.addr, af);
+ sk->lan.port = sk->gwy.port;
+ }
+#endif
+ } else {
+ PF_ACPY(&sk->lan.addr, daddr, af);
+ PF_ACPY(&sk->ext.addr, saddr, af);
+ switch (pd->proto) {
+ case IPPROTO_ICMP:
+#if INET6
+ case IPPROTO_ICMPV6:
+#endif
+#ifndef NO_APPLE_EXTENSIONS
+ sk->lan.xport = nxport;
+ sk->ext.xport.spi = 0;
+#else
+ sk->lan.port = nport;
+ sk->ext.port = 0;
+#endif
+ break;
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_ESP:
+ sk->ext.xport.spi = 0;
+ sk->lan.xport.spi = pd->hdr.esp->spi;
+ break;
+ default:
+ sk->lan.xport = dxport;
+ sk->ext.xport = sxport;
+ break;
+#else
+ default:
+ sk->lan.port = dport;
+ sk->ext.port = sport;
+#endif
+ }
+#ifndef NO_APPLE_EXTENSIONS
+ if (nr != NULL) {
+ PF_ACPY(&sk->gwy.addr, &pd->baddr, af);
+ sk->gwy.xport = bxport;
+ } else {
+ PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af);
+ sk->gwy.xport = sk->lan.xport;
+ }
+ }
+#else
+ if (nr != NULL) {
+ PF_ACPY(&sk->gwy.addr, &pd->baddr, af);
+ sk->gwy.port = bport;
+ } else {
+ PF_ACPY(&sk->gwy.addr, &sk->lan.addr, af);
+ sk->gwy.port = sk->lan.port;
+ }
+ }
+#endif
+
+ pf_set_rt_ifp(s, saddr); /* needs s->state_key set */
+
+#ifndef NO_APPLE_EXTENSIONS
+ m = pd->mp;
+
+ if (sk->app_state == 0) {
+ switch (pd->proto) {
+ case IPPROTO_TCP: {
+ u_int16_t dport = (direction == PF_OUT) ?
+ sk->ext.xport.port : sk->gwy.xport.port;
+
+ if (nr != NULL && dport == PF_PPTP_PORT) {
+ struct pf_app_state *as;
+
+ as = pool_get(&pf_app_state_pl,
+ PR_WAITOK);
+ if (!as) {
+ REASON_SET(&reason,
+ PFRES_MEMORY);
+ goto cleanup;
+ }
+
+ bzero(as, sizeof (*as));
+ as->handler = pf_pptp_handler;
+ as->compare_lan_ext = 0;
+ as->compare_ext_gwy = 0;
+ as->u.pptp.grev1_state = 0;
+ sk->app_state = as;
+ (void) hook_establish(&s->unlink_hooks,
+ 0, (hook_fn_t) pf_pptp_unlink, s);
+ }
+ break;
+ }
+
+ case IPPROTO_UDP: {
+ struct udphdr *uh = pd->hdr.udp;
+
+ if (nr != NULL && uh->uh_sport == PF_IKE_PORT &&
+ uh->uh_dport == PF_IKE_PORT) {
+ struct pf_app_state *as;
+
+ as = pool_get(&pf_app_state_pl,
+ PR_WAITOK);
+ if (!as) {
+ REASON_SET(&reason,
+ PFRES_MEMORY);
+ goto cleanup;
+ }
+
+ bzero(as, sizeof (*as));
+ as->compare_lan_ext = pf_ike_compare;
+ as->compare_ext_gwy = pf_ike_compare;
+ as->u.ike.cookie = ike.initiator_cookie;
+ sk->app_state = as;
+ }
+ break;
+ }
+
+ default:
+ break;
+ }
+ }
+#endif
+
+ if (pf_insert_state(BOUND_IFACE(r, kif), s)) {
+ if (pd->proto == IPPROTO_TCP)
+ pf_normalize_tcp_cleanup(s);
+ REASON_SET(&reason, PFRES_STATEINS);
+ pf_src_tree_remove_state(s);
+ STATE_DEC_COUNTERS(s);
+ pool_put(&pf_state_pl, s);
+ return (PF_DROP);
+ } else
+ *sm = s;
+ if (tag > 0) {
+ pf_tag_ref(tag);
+ s->tag = tag;
+ }
+ if (pd->proto == IPPROTO_TCP &&
+ (th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN &&
+ r->keep_state == PF_STATE_SYNPROXY) {
+ s->src.state = PF_TCPS_PROXY_SRC;
+ if (nr != NULL) {
+#ifndef NO_APPLE_EXTENSIONS
+ if (direction == PF_OUT) {
+ pf_change_ap(direction, pd->mp, saddr,
+ &th->th_sport, pd->ip_sum,
+ &th->th_sum, &pd->baddr,
+ bxport.port, 0, af);
+ sxport.port = th->th_sport;
+ } else {
+ pf_change_ap(direction, pd->mp, daddr,
+ &th->th_dport, pd->ip_sum,
+ &th->th_sum, &pd->baddr,
+ bxport.port, 0, af);
+ sxport.port = th->th_dport;
+ }
+#else
+ if (direction == PF_OUT) {
+ pf_change_ap(saddr, &th->th_sport,
+ pd->ip_sum, &th->th_sum, &pd->baddr,
+ bport, 0, af);
+ sport = th->th_sport;
+ } else {
+ pf_change_ap(daddr, &th->th_dport,
+ pd->ip_sum, &th->th_sum, &pd->baddr,
+ bport, 0, af);
+ sport = th->th_dport;
+ }
+#endif
+ }
+ s->src.seqhi = htonl(random());
+ /* Find mss option */
+ mss = pf_get_mss(m, off, th->th_off, af);
+ mss = pf_calc_mss(saddr, af, mss);
+ mss = pf_calc_mss(daddr, af, mss);
+ s->src.mss = mss;
+ pf_send_tcp(r, af, daddr, saddr, th->th_dport,
+ th->th_sport, s->src.seqhi, ntohl(th->th_seq) + 1,
+ TH_SYN|TH_ACK, 0, s->src.mss, 0, 1, 0, NULL, NULL);
+ REASON_SET(&reason, PFRES_SYNPROXY);
+ return (PF_SYNPROXY_DROP);
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (sk->app_state && sk->app_state->handler) {
+ int offx = off;
+
+ switch (pd->proto) {
+ case IPPROTO_TCP:
+ offx += th->th_off << 2;
+ break;
+ case IPPROTO_UDP:
+ offx += pd->hdr.udp->uh_ulen << 2;
+ break;
+ default:
+ /* ALG handlers only apply to TCP and UDP rules */
+ break;
+ }
+
+ if (offx > off) {
+ sk->app_state->handler(s, direction, offx,
+ pd, kif);
+ if (pd->lmw < 0) {
+ REASON_SET(&reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+ m = pd->mp;
+ }
+ }
+#endif
+ }
+
+ /* copy back packet headers if we performed NAT operations */
+#ifndef NO_APPLE_EXTENSIONS
+ if (rewrite) {
+ if (rewrite < off + hdrlen)
+ rewrite = off + hdrlen;
+
+ m = pf_lazy_makewritable(pd, pd->mp, rewrite);
+ if (!m) {
+ REASON_SET(&reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+
+ m_copyback(m, off, hdrlen, pd->hdr.any);
+ }
+#else
+ if (rewrite)
+ m_copyback(m, off, hdrlen, pd->hdr.any);
+#endif
+
+ return (PF_PASS);
+}
+
+static int
+pf_test_fragment(struct pf_rule **rm, int direction, struct pfi_kif *kif,
+ struct mbuf *m, void *h, struct pf_pdesc *pd, struct pf_rule **am,
+ struct pf_ruleset **rsm)
+{
+#pragma unused(h)
+ struct pf_rule *r, *a = NULL;
+ struct pf_ruleset *ruleset = NULL;
+ sa_family_t af = pd->af;
+ u_short reason;
+ int tag = -1;
+ int asd = 0;
+ int match = 0;
+
+ r = TAILQ_FIRST(pf_main_ruleset.rules[PF_RULESET_FILTER].active.ptr);
+ while (r != NULL) {
+ r->evaluations++;
+ if (pfi_kif_match(r->kif, kif) == r->ifnot)
+ r = r->skip[PF_SKIP_IFP].ptr;
+ else if (r->direction && r->direction != direction)
+ r = r->skip[PF_SKIP_DIR].ptr;
+ else if (r->af && r->af != af)
+ r = r->skip[PF_SKIP_AF].ptr;
+ else if (r->proto && r->proto != pd->proto)
+ r = r->skip[PF_SKIP_PROTO].ptr;
+ else if (PF_MISMATCHAW(&r->src.addr, pd->src, af,
+ r->src.neg, kif))
+ r = r->skip[PF_SKIP_SRC_ADDR].ptr;
+ else if (PF_MISMATCHAW(&r->dst.addr, pd->dst, af,
+ r->dst.neg, NULL))
+ r = r->skip[PF_SKIP_DST_ADDR].ptr;
+ else if (r->tos && !(r->tos == pd->tos))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->os_fingerprint != PF_OSFP_ANY)
+ r = TAILQ_NEXT(r, entries);
+#ifndef NO_APPLE_EXTENSIONS
+ else if (pd->proto == IPPROTO_UDP &&
+ (r->src.xport.range.op || r->dst.xport.range.op))
+ r = TAILQ_NEXT(r, entries);
+ else if (pd->proto == IPPROTO_TCP &&
+ (r->src.xport.range.op || r->dst.xport.range.op ||
+ r->flagset))
+ r = TAILQ_NEXT(r, entries);
+#else
+ else if (pd->proto == IPPROTO_UDP &&
+ (r->src.port_op || r->dst.port_op))
+ r = TAILQ_NEXT(r, entries);
+ else if (pd->proto == IPPROTO_TCP &&
+ (r->src.port_op || r->dst.port_op || r->flagset))
+ r = TAILQ_NEXT(r, entries);
+#endif
+ else if ((pd->proto == IPPROTO_ICMP ||
+ pd->proto == IPPROTO_ICMPV6) &&
+ (r->type || r->code))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->prob && r->prob <= (random() % (UINT_MAX - 1) + 1))
+ r = TAILQ_NEXT(r, entries);
+ else if (r->match_tag && !pf_match_tag(m, r, pd->pf_mtag, &tag))
+ r = TAILQ_NEXT(r, entries);
+ else {
+ if (r->anchor == NULL) {
+ match = 1;
+ *rm = r;
+ *am = a;
+ *rsm = ruleset;
+ if ((*rm)->quick)
+ break;
+ r = TAILQ_NEXT(r, entries);
+ } else
+ pf_step_into_anchor(&asd, &ruleset,
+ PF_RULESET_FILTER, &r, &a, &match);
+ }
+ if (r == NULL && pf_step_out_of_anchor(&asd, &ruleset,
+ PF_RULESET_FILTER, &r, &a, &match))
+ break;
+ }
+ r = *rm;
+ a = *am;
+ ruleset = *rsm;
+
+ REASON_SET(&reason, PFRES_MATCH);
+
+ if (r->log)
+ PFLOG_PACKET(kif, h, m, af, direction, reason, r, a, ruleset,
+ pd);
+
+ if (r->action != PF_PASS)
+ return (PF_DROP);
+
+ if (pf_tag_packet(m, pd->pf_mtag, tag, -1)) {
+ REASON_SET(&reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+
+ return (PF_PASS);
+}
+
+#ifndef NO_APPLE_EXTENSIONS
+static void
+pf_pptp_handler(struct pf_state *s, int direction, int off,
+ struct pf_pdesc *pd, struct pfi_kif *kif)
+{
+#pragma unused(direction)
+ struct tcphdr *th;
+ struct pf_pptp_state *as;
+ struct pf_pptp_ctrl_msg cm;
+ size_t plen;
+ struct pf_state *gs;
+ u_int16_t ct;
+ u_int16_t *pac_call_id;
+ u_int16_t *pns_call_id;
+ u_int16_t *spoof_call_id;
+ u_int8_t *pac_state;
+ u_int8_t *pns_state;
+ enum { PF_PPTP_PASS, PF_PPTP_INSERT_GRE, PF_PPTP_REMOVE_GRE } op;
+ struct mbuf *m;
+ struct pf_state_key *sk;
+ struct pf_state_key *gsk;
+
+ m = pd->mp;
+ plen = min(sizeof (cm), m->m_pkthdr.len - off);
+ if (plen < PF_PPTP_CTRL_MSG_MINSIZE)
+ return;
+
+ as = &s->state_key->app_state->u.pptp;
+ m_copydata(m, off, plen, &cm);
+
+ if (cm.hdr.magic != PF_PPTP_MAGIC_NUMBER)
+ return;
+ if (cm.hdr.type != htons(1))
+ return;
+
+ sk = s->state_key;
+ gs = as->grev1_state;
+ if (!gs) {
+ gs = pool_get(&pf_state_pl, PR_WAITOK);
+ if (!gs)
+ return;
+
+ memcpy(gs, s, sizeof (*gs));
+
+ memset(&gs->entry_id, 0, sizeof (gs->entry_id));
+ memset(&gs->entry_list, 0, sizeof (gs->entry_list));
+
+ TAILQ_INIT(&gs->unlink_hooks);
+ gs->rt_kif = NULL;
+ gs->creation = 0;
+ gs->pfsync_time = 0;
+ gs->packets[0] = gs->packets[1] = 0;
+ gs->bytes[0] = gs->bytes[1] = 0;
+ gs->timeout = PFTM_UNLINKED;
+ gs->id = gs->creatorid = 0;
+ gs->src.state = gs->dst.state = PFGRE1S_NO_TRAFFIC;
+ gs->src.scrub = gs->dst.scrub = 0;
+
+ gsk = pf_alloc_state_key(gs);
+ if (!gsk) {
+ pool_put(&pf_state_pl, gs);
+ return;
+ }
+
+ memcpy(&gsk->lan, &sk->lan, sizeof (gsk->lan));
+ memcpy(&gsk->gwy, &sk->gwy, sizeof (gsk->gwy));
+ memcpy(&gsk->ext, &sk->ext, sizeof (gsk->ext));
+ gsk->af = sk->af;
+ gsk->proto = IPPROTO_GRE;
+ gsk->proto_variant = PF_GRE_PPTP_VARIANT;
+ gsk->app_state = 0;
+ gsk->lan.xport.call_id = 0;
+ gsk->gwy.xport.call_id = 0;
+ gsk->ext.xport.call_id = 0;
+
+ as->grev1_state = gs;
+ } else {
+ gsk = gs->state_key;
+ }
+
+ switch (sk->direction) {
+ case PF_IN:
+ pns_call_id = &gsk->ext.xport.call_id;
+ pns_state = &gs->dst.state;
+ pac_call_id = &gsk->lan.xport.call_id;
+ pac_state = &gs->src.state;
+ break;
+
+ case PF_OUT:
+ pns_call_id = &gsk->lan.xport.call_id;
+ pns_state = &gs->src.state;
+ pac_call_id = &gsk->ext.xport.call_id;
+ pac_state = &gs->dst.state;
+ break;
+
+ default:
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_pptp_handler: bad directional!\n"));
+ return;
+ }
+
+ spoof_call_id = 0;
+ op = PF_PPTP_PASS;
+
+ ct = ntohs(cm.ctrl.type);
+
+ switch (ct) {
+ case PF_PPTP_CTRL_TYPE_CALL_OUT_REQ:
+ *pns_call_id = cm.msg.call_out_req.call_id;
+ *pns_state = PFGRE1S_INITIATING;
+ if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
+ spoof_call_id = &cm.msg.call_out_req.call_id;
+ break;
+
+ case PF_PPTP_CTRL_TYPE_CALL_OUT_RPY:
+ *pac_call_id = cm.msg.call_out_rpy.call_id;
+ if (s->nat_rule.ptr)
+ spoof_call_id =
+ (pac_call_id == &gsk->lan.xport.call_id) ?
+ &cm.msg.call_out_rpy.call_id :
+ &cm.msg.call_out_rpy.peer_call_id;
+ if (gs->timeout == PFTM_UNLINKED) {
+ *pac_state = PFGRE1S_INITIATING;
+ op = PF_PPTP_INSERT_GRE;
+ }
+ break;
+
+ case PF_PPTP_CTRL_TYPE_CALL_IN_1ST:
+ *pns_call_id = cm.msg.call_in_1st.call_id;
+ *pns_state = PFGRE1S_INITIATING;
+ if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
+ spoof_call_id = &cm.msg.call_in_1st.call_id;
+ break;
+
+ case PF_PPTP_CTRL_TYPE_CALL_IN_2ND:
+ *pac_call_id = cm.msg.call_in_2nd.call_id;
+ *pac_state = PFGRE1S_INITIATING;
+ if (s->nat_rule.ptr)
+ spoof_call_id =
+ (pac_call_id == &gsk->lan.xport.call_id) ?
+ &cm.msg.call_in_2nd.call_id :
+ &cm.msg.call_in_2nd.peer_call_id;
+ break;
+
+ case PF_PPTP_CTRL_TYPE_CALL_IN_3RD:
+ if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
+ spoof_call_id = &cm.msg.call_in_3rd.call_id;
+ if (cm.msg.call_in_3rd.call_id != *pns_call_id) {
+ break;
+ }
+ if (gs->timeout == PFTM_UNLINKED)
+ op = PF_PPTP_INSERT_GRE;
+ break;
+
+ case PF_PPTP_CTRL_TYPE_CALL_CLR:
+ if (cm.msg.call_clr.call_id != *pns_call_id)
+ op = PF_PPTP_REMOVE_GRE;
+ break;
+
+ case PF_PPTP_CTRL_TYPE_CALL_DISC:
+ if (cm.msg.call_clr.call_id != *pac_call_id)
+ op = PF_PPTP_REMOVE_GRE;
+ break;
+
+ case PF_PPTP_CTRL_TYPE_ERROR:
+ if (s->nat_rule.ptr && pns_call_id == &gsk->lan.xport.call_id)
+ spoof_call_id = &cm.msg.error.peer_call_id;
+ break;
+
+ case PF_PPTP_CTRL_TYPE_SET_LINKINFO:
+ if (s->nat_rule.ptr && pac_call_id == &gsk->lan.xport.call_id)
+ spoof_call_id = &cm.msg.set_linkinfo.peer_call_id;
+ break;
+
+ default:
+ op = PF_PPTP_PASS;
+ break;
+ }
+
+ if (!gsk->gwy.xport.call_id && gsk->lan.xport.call_id) {
+ gsk->gwy.xport.call_id = gsk->lan.xport.call_id;
+ if (spoof_call_id) {
+ u_int16_t call_id = 0;
+ int n = 0;
+ struct pf_state_key_cmp key;
+
+ key.af = gsk->af;
+ key.proto = IPPROTO_GRE;
+ key.proto_variant = PF_GRE_PPTP_VARIANT;
+ PF_ACPY(&key.gwy.addr, &gsk->gwy.addr, key.af);
+ PF_ACPY(&key.ext.addr, &gsk->ext.addr, key.af);
+ key.gwy.xport.call_id = gsk->gwy.xport.call_id;
+ key.ext.xport.call_id = gsk->ext.xport.call_id;
+ do {
+ call_id = htonl(random());
+ } while (!call_id);
+
+ while (pf_find_state_all(&key, PF_IN, 0)) {
+ call_id = ntohs(call_id);
+ --call_id;
+ if (--call_id == 0) call_id = 0xffff;
+ call_id = htons(call_id);
+
+ key.gwy.xport.call_id = call_id;
+
+ if (++n > 65535) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_pptp_handler: failed to spoof "
+ "call id\n"));
+ key.gwy.xport.call_id = 0;
+ break;
+ }
+ }
+
+ gsk->gwy.xport.call_id = call_id;
+ }
+ }
+
+ th = pd->hdr.tcp;
+
+ if (spoof_call_id && gsk->lan.xport.call_id != gsk->gwy.xport.call_id) {
+ if (*spoof_call_id == gsk->gwy.xport.call_id) {
+ *spoof_call_id = gsk->lan.xport.call_id;
+ th->th_sum = pf_cksum_fixup(th->th_sum,
+ gsk->gwy.xport.call_id, gsk->lan.xport.call_id, 0);
+ } else {
+ *spoof_call_id = gsk->gwy.xport.call_id;
+ th->th_sum = pf_cksum_fixup(th->th_sum,
+ gsk->lan.xport.call_id, gsk->gwy.xport.call_id, 0);
+ }
+
+ m = pf_lazy_makewritable(pd, m, off + plen);
+ if (!m)
+ return;
+ m_copyback(m, off, plen, &cm);
+ }
+
+ switch (op) {
+ case PF_PPTP_REMOVE_GRE:
+ gs->timeout = PFTM_PURGE;
+ gs->src.state = gs->dst.state = PFGRE1S_NO_TRAFFIC;
+ gsk->lan.xport.call_id = 0;
+ gsk->gwy.xport.call_id = 0;
+ gsk->ext.xport.call_id = 0;
+ gs->id = gs->creatorid = 0;
+ break;
+
+ case PF_PPTP_INSERT_GRE:
+ gs->creation = pf_time_second();
+ gs->expire = pf_time_second();
+ gs->timeout = PFTM_GREv1_FIRST_PACKET;
+ if (gs->src_node) ++gs->src_node->states;
+ if (gs->nat_src_node) ++gs->nat_src_node->states;
+ pf_set_rt_ifp(gs, &sk->lan.addr);
+ if (pf_insert_state(BOUND_IFACE(s->rule.ptr, kif), gs)) {
+
+ /*
+ * <jhw@apple.com>
+ * FIX ME: insertion can fail when multiple PNS
+ * behind the same NAT open calls to the same PAC
+ * simultaneously because spoofed call ID numbers
+ * are chosen before states are inserted. This is
+ * hard to fix and happens infrequently enough that
+ * users will normally try again and this ALG will
+ * succeed. Failures are expected to be rare enough
+ * that fixing this is a low priority.
+ */
+
+ pf_src_tree_remove_state(gs);
+ STATE_DEC_COUNTERS(gs);
+ pool_put(&pf_state_pl, gs);
+ DPFPRINTF(PF_DEBUG_URGENT, ("pf_pptp_handler: error "
+ "inserting GREv1 state.\n"));
+ }
+ break;
+
+ default:
+ break;
+ }
+}
+
+static void
+pf_pptp_unlink(struct pf_state *s)
+{
+ struct pf_app_state *as = s->state_key->app_state;
+ struct pf_state *gs = as->u.pptp.grev1_state;
+
+ if (gs) {
+ if (gs->timeout < PFTM_MAX)
+ gs->timeout = PFTM_PURGE;
+ as->u.pptp.grev1_state = 0;
+ }
+}
+
+static int
+pf_ike_compare(struct pf_app_state *a, struct pf_app_state *b)
+{
+ int64_t d = a->u.ike.cookie - b->u.ike.cookie;
+ return ((d > 0) ? 1 : ((d < 0) ? -1 : 0));
+}
+#endif
+
+static int
+pf_test_state_tcp(struct pf_state **state, int direction, struct pfi_kif *kif,
+ struct mbuf *m, int off, void *h, struct pf_pdesc *pd,
+ u_short *reason)
+{
+#pragma unused(h)
+ struct pf_state_key_cmp key;
+ struct tcphdr *th = pd->hdr.tcp;
+ u_int16_t win = ntohs(th->th_win);
+ u_int32_t ack, end, seq, orig_seq;
+ u_int8_t sws, dws;
+ int ackskew;
+ int copyback = 0;
+ struct pf_state_peer *src, *dst;
+
+#ifndef NO_APPLE_EXTENSIONS
+ key.app_state = 0;
+#endif
+ key.af = pd->af;
+ key.proto = IPPROTO_TCP;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd->src, key.af);
+ PF_ACPY(&key.gwy.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = th->th_sport;
+ key.gwy.xport.port = th->th_dport;
+#else
+ key.ext.port = th->th_sport;
+ key.gwy.port = th->th_dport;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd->src, key.af);
+ PF_ACPY(&key.ext.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = th->th_sport;
+ key.ext.xport.port = th->th_dport;
+#else
+ key.lan.port = th->th_sport;
+ key.ext.port = th->th_dport;
+#endif
+ }
+
+ STATE_LOOKUP();
+
+ if (direction == (*state)->state_key->direction) {
+ src = &(*state)->src;
+ dst = &(*state)->dst;
+ } else {
+ src = &(*state)->dst;
+ dst = &(*state)->src;
+ }
+
+ if ((*state)->src.state == PF_TCPS_PROXY_SRC) {
+ if (direction != (*state)->state_key->direction) {
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_SYNPROXY_DROP);
+ }
+ if (th->th_flags & TH_SYN) {
+ if (ntohl(th->th_seq) != (*state)->src.seqlo) {
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_DROP);
+ }
+ pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
+ pd->src, th->th_dport, th->th_sport,
+ (*state)->src.seqhi, ntohl(th->th_seq) + 1,
+ TH_SYN|TH_ACK, 0, (*state)->src.mss, 0, 1,
+ 0, NULL, NULL);
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_SYNPROXY_DROP);
+ } else if (!(th->th_flags & TH_ACK) ||
+ (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
+ (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_DROP);
+ } else if ((*state)->src_node != NULL &&
+ pf_src_connlimit(state)) {
+ REASON_SET(reason, PFRES_SRCLIMIT);
+ return (PF_DROP);
+ } else
+ (*state)->src.state = PF_TCPS_PROXY_DST;
+ }
+ if ((*state)->src.state == PF_TCPS_PROXY_DST) {
+ struct pf_state_host *psrc, *pdst;
+
+ if (direction == PF_OUT) {
+ psrc = &(*state)->state_key->gwy;
+ pdst = &(*state)->state_key->ext;
+ } else {
+ psrc = &(*state)->state_key->ext;
+ pdst = &(*state)->state_key->lan;
+ }
+ if (direction == (*state)->state_key->direction) {
+ if (((th->th_flags & (TH_SYN|TH_ACK)) != TH_ACK) ||
+ (ntohl(th->th_ack) != (*state)->src.seqhi + 1) ||
+ (ntohl(th->th_seq) != (*state)->src.seqlo + 1)) {
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_DROP);
+ }
+ (*state)->src.max_win = MAX(ntohs(th->th_win), 1);
+ if ((*state)->dst.seqhi == 1)
+ (*state)->dst.seqhi = htonl(random());
+ pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr,
+#ifndef NO_APPLE_EXTENSIONS
+ &pdst->addr, psrc->xport.port, pdst->xport.port,
+#else
+ &pdst->addr, psrc->port, pdst->port,
+#endif
+ (*state)->dst.seqhi, 0, TH_SYN, 0,
+ (*state)->src.mss, 0, 0, (*state)->tag, NULL, NULL);
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_SYNPROXY_DROP);
+ } else if (((th->th_flags & (TH_SYN|TH_ACK)) !=
+ (TH_SYN|TH_ACK)) ||
+ (ntohl(th->th_ack) != (*state)->dst.seqhi + 1)) {
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_DROP);
+ } else {
+ (*state)->dst.max_win = MAX(ntohs(th->th_win), 1);
+ (*state)->dst.seqlo = ntohl(th->th_seq);
+ pf_send_tcp((*state)->rule.ptr, pd->af, pd->dst,
+ pd->src, th->th_dport, th->th_sport,
+ ntohl(th->th_ack), ntohl(th->th_seq) + 1,
+ TH_ACK, (*state)->src.max_win, 0, 0, 0,
+ (*state)->tag, NULL, NULL);
+ pf_send_tcp((*state)->rule.ptr, pd->af, &psrc->addr,
+#ifndef NO_APPLE_EXTENSIONS
+ &pdst->addr, psrc->xport.port, pdst->xport.port,
+#else
+ &pdst->addr, psrc->port, pdst->port,
+#endif
+ (*state)->src.seqhi + 1, (*state)->src.seqlo + 1,
+ TH_ACK, (*state)->dst.max_win, 0, 0, 1,
+ 0, NULL, NULL);
+ (*state)->src.seqdiff = (*state)->dst.seqhi -
+ (*state)->src.seqlo;
+ (*state)->dst.seqdiff = (*state)->src.seqhi -
+ (*state)->dst.seqlo;
+ (*state)->src.seqhi = (*state)->src.seqlo +
+ (*state)->dst.max_win;
+ (*state)->dst.seqhi = (*state)->dst.seqlo +
+ (*state)->src.max_win;
+ (*state)->src.wscale = (*state)->dst.wscale = 0;
+ (*state)->src.state = (*state)->dst.state =
+ TCPS_ESTABLISHED;
+ REASON_SET(reason, PFRES_SYNPROXY);
+ return (PF_SYNPROXY_DROP);
+ }
+ }
+
+ if (((th->th_flags & (TH_SYN|TH_ACK)) == TH_SYN) &&
+ dst->state >= TCPS_FIN_WAIT_2 &&
+ src->state >= TCPS_FIN_WAIT_2) {
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf: state reuse ");
+ pf_print_state(*state);
+ pf_print_flags(th->th_flags);
+ printf("\n");
+ }
+ /* XXX make sure it's the same direction ?? */
+ (*state)->src.state = (*state)->dst.state = TCPS_CLOSED;
+ pf_unlink_state(*state);
+ *state = NULL;
+ return (PF_DROP);
+ }
+
+ if (src->wscale && dst->wscale && !(th->th_flags & TH_SYN)) {
+ sws = src->wscale & PF_WSCALE_MASK;
+ dws = dst->wscale & PF_WSCALE_MASK;
+ } else
+ sws = dws = 0;
+
+ /*
+ * Sequence tracking algorithm from Guido van Rooij's paper:
+ * http://www.madison-gurkha.com/publications/tcp_filtering/
+ * tcp_filtering.ps
+ */
+
+ orig_seq = seq = ntohl(th->th_seq);
+ if (src->seqlo == 0) {
+ /* First packet from this end. Set its state */
+
+ if ((pd->flags & PFDESC_TCP_NORM || dst->scrub) &&
+ src->scrub == NULL) {
+ if (pf_normalize_tcp_init(m, off, pd, th, src, dst)) {
+ REASON_SET(reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+ }
+
+ /* Deferred generation of sequence number modulator */
+ if (dst->seqdiff && !src->seqdiff) {
+ /* use random iss for the TCP server */
+ while ((src->seqdiff = random() - seq) == 0)
+ ;
+ ack = ntohl(th->th_ack) - dst->seqdiff;
+ pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
+ src->seqdiff), 0);
+ pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
+ copyback = off + sizeof (*th);
+ } else {
+ ack = ntohl(th->th_ack);
+ }
+
+ end = seq + pd->p_len;
+ if (th->th_flags & TH_SYN) {
+ end++;
+ if (dst->wscale & PF_WSCALE_FLAG) {
+ src->wscale = pf_get_wscale(m, off, th->th_off,
+ pd->af);
+ if (src->wscale & PF_WSCALE_FLAG) {
+ /*
+ * Remove scale factor from initial
+ * window
+ */
+ sws = src->wscale & PF_WSCALE_MASK;
+ win = ((u_int32_t)win + (1 << sws) - 1)
+ >> sws;
+ dws = dst->wscale & PF_WSCALE_MASK;
+ } else {
+ /* fixup other window */
+ dst->max_win <<= dst->wscale &
+ PF_WSCALE_MASK;
+ /* in case of a retrans SYN|ACK */
+ dst->wscale = 0;
+ }
+ }
+ }
+ if (th->th_flags & TH_FIN)
+ end++;
+
+ src->seqlo = seq;
+ if (src->state < TCPS_SYN_SENT)
+ src->state = TCPS_SYN_SENT;
+
+ /*
+ * May need to slide the window (seqhi may have been set by
+ * the crappy stack check or if we picked up the connection
+ * after establishment)
+ */
+ if (src->seqhi == 1 ||
+ SEQ_GEQ(end + MAX(1, dst->max_win << dws), src->seqhi))
+ src->seqhi = end + MAX(1, dst->max_win << dws);
+ if (win > src->max_win)
+ src->max_win = win;
+
+ } else {
+ ack = ntohl(th->th_ack) - dst->seqdiff;
+ if (src->seqdiff) {
+ /* Modulate sequence numbers */
+ pf_change_a(&th->th_seq, &th->th_sum, htonl(seq +
+ src->seqdiff), 0);
+ pf_change_a(&th->th_ack, &th->th_sum, htonl(ack), 0);
+ copyback = off+ sizeof (*th);
+ }
+ end = seq + pd->p_len;
+ if (th->th_flags & TH_SYN)
+ end++;
+ if (th->th_flags & TH_FIN)
+ end++;
+ }
+
+ if ((th->th_flags & TH_ACK) == 0) {
+ /* Let it pass through the ack skew check */
+ ack = dst->seqlo;
+ } else if ((ack == 0 &&
+ (th->th_flags & (TH_ACK|TH_RST)) == (TH_ACK|TH_RST)) ||
+ /* broken tcp stacks do not set ack */
+ (dst->state < TCPS_SYN_SENT)) {
+ /*
+ * Many stacks (ours included) will set the ACK number in an
+ * FIN|ACK if the SYN times out -- no sequence to ACK.
+ */
+ ack = dst->seqlo;
+ }
+
+ if (seq == end) {
+ /* Ease sequencing restrictions on no data packets */
+ seq = src->seqlo;
+ end = seq;
+ }
+
+ ackskew = dst->seqlo - ack;
+
+
+ /*
+ * Need to demodulate the sequence numbers in any TCP SACK options
+ * (Selective ACK). We could optionally validate the SACK values
+ * against the current ACK window, either forwards or backwards, but
+ * I'm not confident that SACK has been implemented properly
+ * everywhere. It wouldn't surprise me if several stacks accidently
+ * SACK too far backwards of previously ACKed data. There really aren't
+ * any security implications of bad SACKing unless the target stack
+ * doesn't validate the option length correctly. Someone trying to
+ * spoof into a TCP connection won't bother blindly sending SACK
+ * options anyway.
+ */
+ if (dst->seqdiff && (th->th_off << 2) > (int)sizeof (struct tcphdr)) {
+#ifndef NO_APPLE_EXTENSIONS
+ copyback = pf_modulate_sack(m, off, pd, th, dst);
+ if (copyback == -1) {
+ REASON_SET(reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+
+ m = pd->mp;
+#else
+ if (pf_modulate_sack(m, off, pd, th, dst))
+ copyback = 1;
+#endif
+ }
+
+
+#define MAXACKWINDOW (0xffff + 1500) /* 1500 is an arbitrary fudge factor */
+ if (SEQ_GEQ(src->seqhi, end) &&
+ /* Last octet inside other's window space */
+ SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) &&
+ /* Retrans: not more than one window back */
+ (ackskew >= -MAXACKWINDOW) &&
+ /* Acking not more than one reassembled fragment backwards */
+ (ackskew <= (MAXACKWINDOW << sws)) &&
+ /* Acking not more than one window forward */
+ ((th->th_flags & TH_RST) == 0 || orig_seq == src->seqlo ||
+ (orig_seq == src->seqlo + 1) || (orig_seq + 1 == src->seqlo) ||
+ (pd->flags & PFDESC_IP_REAS) == 0)) {
+ /* Require an exact/+1 sequence match on resets when possible */
+
+ if (dst->scrub || src->scrub) {
+ if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
+ *state, src, dst, ©back))
+ return (PF_DROP);
+
+#ifndef NO_APPLE_EXTENSIONS
+ m = pd->mp;
+#endif
+ }
+
+ /* update max window */
+ if (src->max_win < win)
+ src->max_win = win;
+ /* synchronize sequencing */
+ if (SEQ_GT(end, src->seqlo))
+ src->seqlo = end;
+ /* slide the window of what the other end can send */
+ if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
+ dst->seqhi = ack + MAX((win << sws), 1);
+
+
+ /* update states */
+ if (th->th_flags & TH_SYN)
+ if (src->state < TCPS_SYN_SENT)
+ src->state = TCPS_SYN_SENT;
+ if (th->th_flags & TH_FIN)
+ if (src->state < TCPS_CLOSING)
+ src->state = TCPS_CLOSING;
+ if (th->th_flags & TH_ACK) {
+ if (dst->state == TCPS_SYN_SENT) {
+ dst->state = TCPS_ESTABLISHED;
+ if (src->state == TCPS_ESTABLISHED &&
+ (*state)->src_node != NULL &&
+ pf_src_connlimit(state)) {
+ REASON_SET(reason, PFRES_SRCLIMIT);
+ return (PF_DROP);
+ }
+ } else if (dst->state == TCPS_CLOSING)
+ dst->state = TCPS_FIN_WAIT_2;
+ }
+ if (th->th_flags & TH_RST)
+ src->state = dst->state = TCPS_TIME_WAIT;
+
+ /* update expire time */
+ (*state)->expire = pf_time_second();
+ if (src->state >= TCPS_FIN_WAIT_2 &&
+ dst->state >= TCPS_FIN_WAIT_2)
+ (*state)->timeout = PFTM_TCP_CLOSED;
+ else if (src->state >= TCPS_CLOSING &&
+ dst->state >= TCPS_CLOSING)
+ (*state)->timeout = PFTM_TCP_FIN_WAIT;
+ else if (src->state < TCPS_ESTABLISHED ||
+ dst->state < TCPS_ESTABLISHED)
+ (*state)->timeout = PFTM_TCP_OPENING;
+ else if (src->state >= TCPS_CLOSING ||
+ dst->state >= TCPS_CLOSING)
+ (*state)->timeout = PFTM_TCP_CLOSING;
+ else
+ (*state)->timeout = PFTM_TCP_ESTABLISHED;
+
+ /* Fall through to PASS packet */
+
+ } else if ((dst->state < TCPS_SYN_SENT ||
+ dst->state >= TCPS_FIN_WAIT_2 || src->state >= TCPS_FIN_WAIT_2) &&
+ SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) &&
+ /* Within a window forward of the originating packet */
+ SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW)) {
+ /* Within a window backward of the originating packet */
+
+ /*
+ * This currently handles three situations:
+ * 1) Stupid stacks will shotgun SYNs before their peer
+ * replies.
+ * 2) When PF catches an already established stream (the
+ * firewall rebooted, the state table was flushed, routes
+ * changed...)
+ * 3) Packets get funky immediately after the connection
+ * closes (this should catch Solaris spurious ACK|FINs
+ * that web servers like to spew after a close)
+ *
+ * This must be a little more careful than the above code
+ * since packet floods will also be caught here. We don't
+ * update the TTL here to mitigate the damage of a packet
+ * flood and so the same code can handle awkward establishment
+ * and a loosened connection close.
+ * In the establishment case, a correct peer response will
+ * validate the connection, go through the normal state code
+ * and keep updating the state TTL.
+ */
+
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf: loose state match: ");
+ pf_print_state(*state);
+ pf_print_flags(th->th_flags);
+ printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
+ "pkts=%llu:%llu dir=%s,%s\n", seq, orig_seq, ack,
+ pd->p_len, ackskew, (*state)->packets[0],
+ (*state)->packets[1],
+ direction == PF_IN ? "in" : "out",
+ direction == (*state)->state_key->direction ?
+ "fwd" : "rev");
+ }
+
+ if (dst->scrub || src->scrub) {
+ if (pf_normalize_tcp_stateful(m, off, pd, reason, th,
+ *state, src, dst, ©back))
+ return (PF_DROP);
+#ifndef NO_APPLE_EXTENSIONS
+ m = pd->mp;
+#endif
+ }
+
+ /* update max window */
+ if (src->max_win < win)
+ src->max_win = win;
+ /* synchronize sequencing */
+ if (SEQ_GT(end, src->seqlo))
+ src->seqlo = end;
+ /* slide the window of what the other end can send */
+ if (SEQ_GEQ(ack + (win << sws), dst->seqhi))
+ dst->seqhi = ack + MAX((win << sws), 1);
+
+ /*
+ * Cannot set dst->seqhi here since this could be a shotgunned
+ * SYN and not an already established connection.
+ */
+
+ if (th->th_flags & TH_FIN)
+ if (src->state < TCPS_CLOSING)
+ src->state = TCPS_CLOSING;
+ if (th->th_flags & TH_RST)
+ src->state = dst->state = TCPS_TIME_WAIT;
+
+ /* Fall through to PASS packet */
+
+ } else {
+ if ((*state)->dst.state == TCPS_SYN_SENT &&
+ (*state)->src.state == TCPS_SYN_SENT) {
+ /* Send RST for state mismatches during handshake */
+ if (!(th->th_flags & TH_RST))
+ pf_send_tcp((*state)->rule.ptr, pd->af,
+ pd->dst, pd->src, th->th_dport,
+ th->th_sport, ntohl(th->th_ack), 0,
+ TH_RST, 0, 0,
+ (*state)->rule.ptr->return_ttl, 1, 0,
+ pd->eh, kif->pfik_ifp);
+ src->seqlo = 0;
+ src->seqhi = 1;
+ src->max_win = 1;
+ } else if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf: BAD state: ");
+ pf_print_state(*state);
+ pf_print_flags(th->th_flags);
+ printf(" seq=%u (%u) ack=%u len=%u ackskew=%d "
+ "pkts=%llu:%llu dir=%s,%s\n",
+ seq, orig_seq, ack, pd->p_len, ackskew,
+ (*state)->packets[0], (*state)->packets[1],
+ direction == PF_IN ? "in" : "out",
+ direction == (*state)->state_key->direction ?
+ "fwd" : "rev");
+ printf("pf: State failure on: %c %c %c %c | %c %c\n",
+ SEQ_GEQ(src->seqhi, end) ? ' ' : '1',
+ SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws)) ?
+ ' ': '2',
+ (ackskew >= -MAXACKWINDOW) ? ' ' : '3',
+ (ackskew <= (MAXACKWINDOW << sws)) ? ' ' : '4',
+ SEQ_GEQ(src->seqhi + MAXACKWINDOW, end) ?' ' :'5',
+ SEQ_GEQ(seq, src->seqlo - MAXACKWINDOW) ?' ' :'6');
+ }
+ REASON_SET(reason, PFRES_BADSTATE);
+ return (PF_DROP);
+ }
+
+ /* Any packets which have gotten here are to be passed */
+
+#ifndef NO_APPLE_EXTENSIONS
+ if ((*state)->state_key->app_state &&
+ (*state)->state_key->app_state->handler) {
+ (*state)->state_key->app_state->handler(*state, direction,
+ off + (th->th_off << 2), pd, kif);
+ if (pd->lmw < 0) {
+ REASON_SET(reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+ m = pd->mp;
+ }
+
+ /* translate source/destination address, if necessary */
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_OUT)
+ pf_change_ap(direction, pd->mp, pd->src, &th->th_sport,
+ pd->ip_sum, &th->th_sum,
+ &(*state)->state_key->gwy.addr,
+ (*state)->state_key->gwy.xport.port, 0, pd->af);
+ else
+ pf_change_ap(direction, pd->mp, pd->dst, &th->th_dport,
+ pd->ip_sum, &th->th_sum,
+ &(*state)->state_key->lan.addr,
+ (*state)->state_key->lan.xport.port, 0, pd->af);
+ copyback = off + sizeof (*th);
+ }
+
+ if (copyback) {
+ m = pf_lazy_makewritable(pd, m, copyback);
+ if (!m) {
+ REASON_SET(reason, PFRES_MEMORY);
+ return (PF_DROP);
+ }
+
+ /* Copyback sequence modulation or stateful scrub changes */
+ m_copyback(m, off, sizeof (*th), th);
+ }
+#else
+ /* translate source/destination address, if necessary */
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_OUT)
+ pf_change_ap(pd->src, pd->mp, &th->th_sport, pd->ip_sum,
+ &th->th_sum, &(*state)->state_key->gwy.addr,
+ (*state)->state_key->gwy.port, 0, pd->af);
+ else
+ pf_change_ap(pd->dst, pd->mp, &th->th_dport, pd->ip_sum,
+ &th->th_sum, &(*state)->state_key->lan.addr,
+ (*state)->state_key->lan.port, 0, pd->af);
+ m_copyback(m, off, sizeof (*th), th);
+ } else if (copyback) {
+ /* Copyback sequence modulation or stateful scrub changes */
+ m_copyback(m, off, sizeof (*th), th);
+ }
+#endif
+
+ return (PF_PASS);
+}
+
+static int
+pf_test_state_udp(struct pf_state **state, int direction, struct pfi_kif *kif,
+ struct mbuf *m, int off, void *h, struct pf_pdesc *pd)
+{
+#pragma unused(h)
+ struct pf_state_peer *src, *dst;
+ struct pf_state_key_cmp key;
+ struct udphdr *uh = pd->hdr.udp;
+#ifndef NO_APPLE_EXTENSIONS
+ struct pf_app_state as;
+ int dx, action, extfilter;
+ key.app_state = 0;
+ key.proto_variant = PF_EXTFILTER_APD;
+#endif
+
+ key.af = pd->af;
+ key.proto = IPPROTO_UDP;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd->src, key.af);
+ PF_ACPY(&key.gwy.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = uh->uh_sport;
+ key.gwy.xport.port = uh->uh_dport;
+ dx = PF_IN;
+#else
+ key.ext.port = uh->uh_sport;
+ key.gwy.port = uh->uh_dport;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd->src, key.af);
+ PF_ACPY(&key.ext.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = uh->uh_sport;
+ key.ext.xport.port = uh->uh_dport;
+ dx = PF_OUT;
+#else
+ key.lan.port = uh->uh_sport;
+ key.ext.port = uh->uh_dport;
+#endif
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (uh->uh_sport == PF_IKE_PORT && uh->uh_dport == PF_IKE_PORT) {
+ struct pf_ike_hdr ike;
+ size_t plen = m->m_pkthdr.len - off - sizeof (*uh);
+ if (plen < PF_IKE_PACKET_MINSIZE) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: IKE message too small.\n"));
+ return (PF_DROP);
+ }
+
+ if (plen > sizeof (ike))
+ plen = sizeof (ike);
+ m_copydata(m, off + sizeof (*uh), plen, &ike);
+
+ if (ike.initiator_cookie) {
+ key.app_state = &as;
+ as.compare_lan_ext = pf_ike_compare;
+ as.compare_ext_gwy = pf_ike_compare;
+ as.u.ike.cookie = ike.initiator_cookie;
+ } else {
+ /*
+ * <http://tools.ietf.org/html/\
+ * draft-ietf-ipsec-nat-t-ike-01>
+ * Support non-standard NAT-T implementations that
+ * push the ESP packet over the top of the IKE packet.
+ * Do not drop packet.
+ */
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: IKE initiator cookie = 0.\n"));
+ }
+ }
+
+ *state = pf_find_state(kif, &key, dx);
+
+ if (!key.app_state && *state == 0) {
+ key.proto_variant = PF_EXTFILTER_AD;
+ *state = pf_find_state(kif, &key, dx);
+ }
+
+ if (!key.app_state && *state == 0) {
+ key.proto_variant = PF_EXTFILTER_EI;
+ *state = pf_find_state(kif, &key, dx);
+ }
+
+ if (pf_state_lookup_aux(state, kif, direction, &action))
+ return (action);
+#else
+ STATE_LOOKUP();
+#endif
+
+ if (direction == (*state)->state_key->direction) {
+ src = &(*state)->src;
+ dst = &(*state)->dst;
+ } else {
+ src = &(*state)->dst;
+ dst = &(*state)->src;
+ }
+
+ /* update states */
+ if (src->state < PFUDPS_SINGLE)
+ src->state = PFUDPS_SINGLE;
+ if (dst->state == PFUDPS_SINGLE)
+ dst->state = PFUDPS_MULTIPLE;
+
+ /* update expire time */
+ (*state)->expire = pf_time_second();
+ if (src->state == PFUDPS_MULTIPLE && dst->state == PFUDPS_MULTIPLE)
+ (*state)->timeout = PFTM_UDP_MULTIPLE;
+ else
+ (*state)->timeout = PFTM_UDP_SINGLE;
+
+#ifndef NO_APPLE_EXTENSIONS
+ extfilter = (*state)->state_key->proto_variant;
+ if (extfilter > PF_EXTFILTER_APD) {
+ (*state)->state_key->ext.xport.port = key.ext.xport.port;
+ if (extfilter > PF_EXTFILTER_AD)
+ PF_ACPY(&(*state)->state_key->ext.addr,
+ &key.ext.addr, key.af);
+ }
+
+ if ((*state)->state_key->app_state &&
+ (*state)->state_key->app_state->handler) {
+ (*state)->state_key->app_state->handler(*state, direction,
+ off + uh->uh_ulen, pd, kif);
+ m = pd->mp;
+ }
+#endif
+
+ /* translate source/destination address, if necessary */
+#ifndef NO_APPLE_EXTENSIONS
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ m = pf_lazy_makewritable(pd, m, off + sizeof (*uh));
+ if (!m)
+ return (PF_DROP);
+
+ if (direction == PF_OUT)
+ pf_change_ap(direction, pd->mp, pd->src, &uh->uh_sport,
+ pd->ip_sum, &uh->uh_sum,
+ &(*state)->state_key->gwy.addr,
+ (*state)->state_key->gwy.xport.port, 1, pd->af);
+ else
+ pf_change_ap(direction, pd->mp, pd->dst, &uh->uh_dport,
+ pd->ip_sum, &uh->uh_sum,
+ &(*state)->state_key->lan.addr,
+ (*state)->state_key->lan.xport.port, 1, pd->af);
+ m_copyback(m, off, sizeof (*uh), uh);
+ }
+#else
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_OUT)
+ pf_change_ap(pd->src, &uh->uh_sport, pd->ip_sum,
+ &uh->uh_sum, &(*state)->state_key->gwy.addr,
+ (*state)->state_key->gwy.port, 1, pd->af);
+ else
+ pf_change_ap(pd->dst, &uh->uh_dport, pd->ip_sum,
+ &uh->uh_sum, &(*state)->state_key->lan.addr,
+ (*state)->state_key->lan.port, 1, pd->af);
+ m_copyback(m, off, sizeof (*uh), uh);
+ }
+#endif
+
+ return (PF_PASS);
+}
+
+static int
+pf_test_state_icmp(struct pf_state **state, int direction, struct pfi_kif *kif,
+ struct mbuf *m, int off, void *h, struct pf_pdesc *pd, u_short *reason)
+{
+#pragma unused(h)
+ struct pf_addr *saddr = pd->src, *daddr = pd->dst;
+ u_int16_t icmpid = 0, *icmpsum;
+ u_int8_t icmptype;
+ int state_icmp = 0;
+ struct pf_state_key_cmp key;
+
+#ifndef NO_APPLE_EXTENSIONS
+ struct pf_app_state as;
+ key.app_state = 0;
+#endif
+
+ switch (pd->proto) {
+#if INET
+ case IPPROTO_ICMP:
+ icmptype = pd->hdr.icmp->icmp_type;
+ icmpid = pd->hdr.icmp->icmp_id;
+ icmpsum = &pd->hdr.icmp->icmp_cksum;
+
+ if (icmptype == ICMP_UNREACH ||
+ icmptype == ICMP_SOURCEQUENCH ||
+ icmptype == ICMP_REDIRECT ||
+ icmptype == ICMP_TIMXCEED ||
+ icmptype == ICMP_PARAMPROB)
+ state_icmp++;
+ break;
+#endif /* INET */
+#if INET6
+ case IPPROTO_ICMPV6:
+ icmptype = pd->hdr.icmp6->icmp6_type;
+ icmpid = pd->hdr.icmp6->icmp6_id;
+ icmpsum = &pd->hdr.icmp6->icmp6_cksum;
+
+ if (icmptype == ICMP6_DST_UNREACH ||
+ icmptype == ICMP6_PACKET_TOO_BIG ||
+ icmptype == ICMP6_TIME_EXCEEDED ||
+ icmptype == ICMP6_PARAM_PROB)
+ state_icmp++;
+ break;
+#endif /* INET6 */
+ }
+
+ if (!state_icmp) {
+
+ /*
+ * ICMP query/reply message not related to a TCP/UDP packet.
+ * Search for an ICMP state.
+ */
+ key.af = pd->af;
+ key.proto = pd->proto;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd->src, key.af);
+ PF_ACPY(&key.gwy.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = 0;
+ key.gwy.xport.port = icmpid;
+#else
+ key.ext.port = 0;
+ key.gwy.port = icmpid;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd->src, key.af);
+ PF_ACPY(&key.ext.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = icmpid;
+ key.ext.xport.port = 0;
+#else
+ key.lan.port = icmpid;
+ key.ext.port = 0;
+#endif
+ }
+
+ STATE_LOOKUP();
+
+ (*state)->expire = pf_time_second();
+ (*state)->timeout = PFTM_ICMP_ERROR_REPLY;
+
+ /* translate source/destination address, if necessary */
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_OUT) {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&saddr->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->gwy.addr.v4.s_addr, 0);
+#ifndef NO_APPLE_EXTENSIONS
+ pd->hdr.icmp->icmp_cksum =
+ pf_cksum_fixup(
+ pd->hdr.icmp->icmp_cksum, icmpid,
+ (*state)->state_key->gwy.xport.port, 0);
+ pd->hdr.icmp->icmp_id =
+ (*state)->state_key->gwy.xport.port;
+ m = pf_lazy_makewritable(pd, m,
+ off + ICMP_MINLEN);
+ if (!m)
+ return (PF_DROP);
+#else
+ pd->hdr.icmp->icmp_cksum =
+ pf_cksum_fixup(
+ pd->hdr.icmp->icmp_cksum, icmpid,
+ (*state)->state_key->gwy.port, 0);
+ pd->hdr.icmp->icmp_id =
+ (*state)->state_key->gwy.port;
+#endif
+ m_copyback(m, off, ICMP_MINLEN,
+ pd->hdr.icmp);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ pf_change_a6(saddr,
+ &pd->hdr.icmp6->icmp6_cksum,
+ &(*state)->state_key->gwy.addr, 0);
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m,
+ off + sizeof (struct icmp6_hdr));
+ if (!m)
+ return (PF_DROP);
+#endif
+ m_copyback(m, off,
+ sizeof (struct icmp6_hdr),
+ pd->hdr.icmp6);
+ break;
+#endif /* INET6 */
+ }
+ } else {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&daddr->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->lan.addr.v4.s_addr, 0);
+#ifndef NO_APPLE_EXTENSIONS
+ pd->hdr.icmp->icmp_cksum =
+ pf_cksum_fixup(
+ pd->hdr.icmp->icmp_cksum, icmpid,
+ (*state)->state_key->lan.xport.port, 0);
+ pd->hdr.icmp->icmp_id =
+ (*state)->state_key->lan.xport.port;
+ m = pf_lazy_makewritable(pd, m,
+ off + ICMP_MINLEN);
+ if (!m)
+ return (PF_DROP);
+#else
+ pd->hdr.icmp->icmp_cksum =
+ pf_cksum_fixup(
+ pd->hdr.icmp->icmp_cksum, icmpid,
+ (*state)->state_key->lan.port, 0);
+ pd->hdr.icmp->icmp_id =
+ (*state)->state_key->lan.port;
+#endif
+ m_copyback(m, off, ICMP_MINLEN,
+ pd->hdr.icmp);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ pf_change_a6(daddr,
+ &pd->hdr.icmp6->icmp6_cksum,
+ &(*state)->state_key->lan.addr, 0);
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m,
+ off + sizeof (struct icmp6_hdr));
+ if (!m)
+ return (PF_DROP);
+#endif
+ m_copyback(m, off,
+ sizeof (struct icmp6_hdr),
+ pd->hdr.icmp6);
+ break;
+#endif /* INET6 */
+ }
+ }
+ }
+
+ return (PF_PASS);
+
+ } else {
+ /*
+ * ICMP error message in response to a TCP/UDP packet.
+ * Extract the inner TCP/UDP header and search for that state.
+ */
+
+ struct pf_pdesc pd2;
+#if INET
+ struct ip h2;
+#endif /* INET */
+#if INET6
+ struct ip6_hdr h2_6;
+ int terminal = 0;
+#endif /* INET6 */
+ int ipoff2 = 0;
+ int off2 = 0;
+
+ memset(&pd2, 0, sizeof (pd2));
+
+ pd2.af = pd->af;
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ /* offset of h2 in mbuf chain */
+ ipoff2 = off + ICMP_MINLEN;
+
+ if (!pf_pull_hdr(m, ipoff2, &h2, sizeof (h2),
+ NULL, reason, pd2.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: ICMP error message too short "
+ "(ip)\n"));
+ return (PF_DROP);
+ }
+ /*
+ * ICMP error messages don't refer to non-first
+ * fragments
+ */
+ if (h2.ip_off & htons(IP_OFFMASK)) {
+ REASON_SET(reason, PFRES_FRAG);
+ return (PF_DROP);
+ }
+
+ /* offset of protocol header that follows h2 */
+ off2 = ipoff2 + (h2.ip_hl << 2);
+
+ pd2.proto = h2.ip_p;
+ pd2.src = (struct pf_addr *)&h2.ip_src;
+ pd2.dst = (struct pf_addr *)&h2.ip_dst;
+ pd2.ip_sum = &h2.ip_sum;
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ ipoff2 = off + sizeof (struct icmp6_hdr);
+
+ if (!pf_pull_hdr(m, ipoff2, &h2_6, sizeof (h2_6),
+ NULL, reason, pd2.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: ICMP error message too short "
+ "(ip6)\n"));
+ return (PF_DROP);
+ }
+ pd2.proto = h2_6.ip6_nxt;
+ pd2.src = (struct pf_addr *)&h2_6.ip6_src;
+ pd2.dst = (struct pf_addr *)&h2_6.ip6_dst;
+ pd2.ip_sum = NULL;
+ off2 = ipoff2 + sizeof (h2_6);
+ do {
+ switch (pd2.proto) {
+ case IPPROTO_FRAGMENT:
+ /*
+ * ICMPv6 error messages for
+ * non-first fragments
+ */
+ REASON_SET(reason, PFRES_FRAG);
+ return (PF_DROP);
+ case IPPROTO_AH:
+ case IPPROTO_HOPOPTS:
+ case IPPROTO_ROUTING:
+ case IPPROTO_DSTOPTS: {
+ /* get next header and header length */
+ struct ip6_ext opt6;
+
+ if (!pf_pull_hdr(m, off2, &opt6,
+ sizeof (opt6), NULL, reason,
+ pd2.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: ICMPv6 short opt\n"));
+ return (PF_DROP);
+ }
+ if (pd2.proto == IPPROTO_AH)
+ off2 += (opt6.ip6e_len + 2) * 4;
+ else
+ off2 += (opt6.ip6e_len + 1) * 8;
+ pd2.proto = opt6.ip6e_nxt;
+ /* goto the next header */
+ break;
+ }
+ default:
+ terminal++;
+ break;
+ }
+ } while (!terminal);
+ break;
+#endif /* INET6 */
+ }
+
+ switch (pd2.proto) {
+ case IPPROTO_TCP: {
+ struct tcphdr th;
+ u_int32_t seq;
+ struct pf_state_peer *src, *dst;
+ u_int8_t dws;
+ int copyback = 0;
+
+ /*
+ * Only the first 8 bytes of the TCP header can be
+ * expected. Don't access any TCP header fields after
+ * th_seq, an ackskew test is not possible.
+ */
+ if (!pf_pull_hdr(m, off2, &th, 8, NULL, reason,
+ pd2.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: ICMP error message too short "
+ "(tcp)\n"));
+ return (PF_DROP);
+ }
+
+ key.af = pd2.af;
+ key.proto = IPPROTO_TCP;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd2.dst, key.af);
+ PF_ACPY(&key.gwy.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = th.th_dport;
+ key.gwy.xport.port = th.th_sport;
+#else
+ key.ext.port = th.th_dport;
+ key.gwy.port = th.th_sport;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd2.dst, key.af);
+ PF_ACPY(&key.ext.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = th.th_dport;
+ key.ext.xport.port = th.th_sport;
+#else
+ key.lan.port = th.th_dport;
+ key.ext.port = th.th_sport;
+#endif
+ }
+
+ STATE_LOOKUP();
+
+ if (direction == (*state)->state_key->direction) {
+ src = &(*state)->dst;
+ dst = &(*state)->src;
+ } else {
+ src = &(*state)->src;
+ dst = &(*state)->dst;
+ }
+
+ if (src->wscale && dst->wscale)
+ dws = dst->wscale & PF_WSCALE_MASK;
+ else
+ dws = 0;
+
+ /* Demodulate sequence number */
+ seq = ntohl(th.th_seq) - src->seqdiff;
+ if (src->seqdiff) {
+ pf_change_a(&th.th_seq, icmpsum,
+ htonl(seq), 0);
+ copyback = 1;
+ }
+
+ if (!SEQ_GEQ(src->seqhi, seq) ||
+ !SEQ_GEQ(seq, src->seqlo - (dst->max_win << dws))) {
+ if (pf_status.debug >= PF_DEBUG_MISC) {
+ printf("pf: BAD ICMP %d:%d ",
+ icmptype, pd->hdr.icmp->icmp_code);
+ pf_print_host(pd->src, 0, pd->af);
+ printf(" -> ");
+ pf_print_host(pd->dst, 0, pd->af);
+ printf(" state: ");
+ pf_print_state(*state);
+ printf(" seq=%u\n", seq);
+ }
+ REASON_SET(reason, PFRES_BADSTATE);
+ return (PF_DROP);
+ }
+
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_IN) {
+ pf_change_icmp(pd2.src, &th.th_sport,
+ daddr, &(*state)->state_key->lan.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->lan.xport.port, NULL,
+#else
+ (*state)->state_key->lan.port, NULL,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, pd2.af);
+ } else {
+ pf_change_icmp(pd2.dst, &th.th_dport,
+ saddr, &(*state)->state_key->gwy.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->gwy.xport.port, NULL,
+#else
+ (*state)->state_key->gwy.port, NULL,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, pd2.af);
+ }
+ copyback = 1;
+ }
+
+ if (copyback) {
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m, off2 + 8);
+ if (!m)
+ return (PF_DROP);
+#endif
+ switch (pd2.af) {
+#if INET
+ case AF_INET:
+ m_copyback(m, off, ICMP_MINLEN,
+ pd->hdr.icmp);
+ m_copyback(m, ipoff2, sizeof (h2),
+ &h2);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ m_copyback(m, off,
+ sizeof (struct icmp6_hdr),
+ pd->hdr.icmp6);
+ m_copyback(m, ipoff2, sizeof (h2_6),
+ &h2_6);
+ break;
+#endif /* INET6 */
+ }
+ m_copyback(m, off2, 8, &th);
+ }
+
+ return (PF_PASS);
+ break;
+ }
+ case IPPROTO_UDP: {
+ struct udphdr uh;
+#ifndef NO_APPLE_EXTENSIONS
+ int dx, action;
+#endif
+ if (!pf_pull_hdr(m, off2, &uh, sizeof (uh),
+ NULL, reason, pd2.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: ICMP error message too short "
+ "(udp)\n"));
+ return (PF_DROP);
+ }
+
+ key.af = pd2.af;
+ key.proto = IPPROTO_UDP;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd2.dst, key.af);
+ PF_ACPY(&key.gwy.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = uh.uh_dport;
+ key.gwy.xport.port = uh.uh_sport;
+ dx = PF_IN;
+#else
+ key.ext.port = uh.uh_dport;
+ key.gwy.port = uh.uh_sport;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd2.dst, key.af);
+ PF_ACPY(&key.ext.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = uh.uh_dport;
+ key.ext.xport.port = uh.uh_sport;
+ dx = PF_OUT;
+#else
+ key.lan.port = uh.uh_dport;
+ key.ext.port = uh.uh_sport;
+#endif
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ key.proto_variant = PF_EXTFILTER_APD;
+
+ if (uh.uh_sport == PF_IKE_PORT &&
+ uh.uh_dport == PF_IKE_PORT) {
+ struct pf_ike_hdr ike;
+ size_t plen =
+ m->m_pkthdr.len - off2 - sizeof (uh);
+ if (direction == PF_IN &&
+ plen < 8 /* PF_IKE_PACKET_MINSIZE */) {
+ DPFPRINTF(PF_DEBUG_MISC, ("pf: "
+ "ICMP error, embedded IKE message "
+ "too small.\n"));
+ return (PF_DROP);
+ }
+
+ if (plen > sizeof (ike))
+ plen = sizeof (ike);
+ m_copydata(m, off + sizeof (uh), plen, &ike);
+
+ key.app_state = &as;
+ as.compare_lan_ext = pf_ike_compare;
+ as.compare_ext_gwy = pf_ike_compare;
+ as.u.ike.cookie = ike.initiator_cookie;
+ }
+
+ *state = pf_find_state(kif, &key, dx);
+
+ if (key.app_state && *state == 0) {
+ key.app_state = 0;
+ *state = pf_find_state(kif, &key, dx);
+ }
+
+ if (*state == 0) {
+ key.proto_variant = PF_EXTFILTER_AD;
+ *state = pf_find_state(kif, &key, dx);
+ }
+
+ if (*state == 0) {
+ key.proto_variant = PF_EXTFILTER_EI;
+ *state = pf_find_state(kif, &key, dx);
+ }
+
+ if (pf_state_lookup_aux(state, kif, direction, &action))
+ return (action);
+#else
+ STATE_LOOKUP();
+#endif
+
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_IN) {
+ pf_change_icmp(pd2.src, &uh.uh_sport,
+ daddr, &(*state)->state_key->lan.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->lan.xport.port, &uh.uh_sum,
+#else
+ (*state)->state_key->lan.port, &uh.uh_sum,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 1, pd2.af);
+ } else {
+ pf_change_icmp(pd2.dst, &uh.uh_dport,
+ saddr, &(*state)->state_key->gwy.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->gwy.xport.port, &uh.uh_sum,
+#else
+ (*state)->state_key->gwy.port, &uh.uh_sum,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 1, pd2.af);
+ }
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m,
+ off2 + sizeof (uh));
+ if (!m)
+ return (PF_DROP);
+#endif
+ switch (pd2.af) {
+#if INET
+ case AF_INET:
+ m_copyback(m, off, ICMP_MINLEN,
+ pd->hdr.icmp);
+ m_copyback(m, ipoff2, sizeof (h2), &h2);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ m_copyback(m, off,
+ sizeof (struct icmp6_hdr),
+ pd->hdr.icmp6);
+ m_copyback(m, ipoff2, sizeof (h2_6),
+ &h2_6);
+ break;
+#endif /* INET6 */
+ }
+ m_copyback(m, off2, sizeof (uh), &uh);
+ }
+
+ return (PF_PASS);
+ break;
+ }
+#if INET
+ case IPPROTO_ICMP: {
+ struct icmp iih;
+
+ if (!pf_pull_hdr(m, off2, &iih, ICMP_MINLEN,
+ NULL, reason, pd2.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: ICMP error message too short i"
+ "(icmp)\n"));
+ return (PF_DROP);
+ }
+
+ key.af = pd2.af;
+ key.proto = IPPROTO_ICMP;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd2.dst, key.af);
+ PF_ACPY(&key.gwy.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = 0;
+ key.gwy.xport.port = iih.icmp_id;
+#else
+ key.ext.port = 0;
+ key.gwy.port = iih.icmp_id;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd2.dst, key.af);
+ PF_ACPY(&key.ext.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = iih.icmp_id;
+ key.ext.xport.port = 0;
+#else
+ key.lan.port = iih.icmp_id;
+ key.ext.port = 0;
+#endif
+ }
+
+ STATE_LOOKUP();
+
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_IN) {
+ pf_change_icmp(pd2.src, &iih.icmp_id,
+ daddr, &(*state)->state_key->lan.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->lan.xport.port, NULL,
+#else
+ (*state)->state_key->lan.port, NULL,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, AF_INET);
+ } else {
+ pf_change_icmp(pd2.dst, &iih.icmp_id,
+ saddr, &(*state)->state_key->gwy.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->gwy.xport.port, NULL,
+#else
+ (*state)->state_key->gwy.port, NULL,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, AF_INET);
+ }
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m, off2 + ICMP_MINLEN);
+ if (!m)
+ return (PF_DROP);
+#endif
+ m_copyback(m, off, ICMP_MINLEN, pd->hdr.icmp);
+ m_copyback(m, ipoff2, sizeof (h2), &h2);
+ m_copyback(m, off2, ICMP_MINLEN, &iih);
+ }
+
+ return (PF_PASS);
+ break;
+ }
+#endif /* INET */
+#if INET6
+ case IPPROTO_ICMPV6: {
+ struct icmp6_hdr iih;
+
+ if (!pf_pull_hdr(m, off2, &iih,
+ sizeof (struct icmp6_hdr), NULL, reason, pd2.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: ICMP error message too short "
+ "(icmp6)\n"));
+ return (PF_DROP);
+ }
+
+ key.af = pd2.af;
+ key.proto = IPPROTO_ICMPV6;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd2.dst, key.af);
+ PF_ACPY(&key.gwy.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = 0;
+ key.gwy.xport.port = iih.icmp6_id;
+#else
+ key.ext.port = 0;
+ key.gwy.port = iih.icmp6_id;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd2.dst, key.af);
+ PF_ACPY(&key.ext.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = iih.icmp6_id;
+ key.ext.xport.port = 0;
+#else
+ key.lan.port = iih.icmp6_id;
+ key.ext.port = 0;
+#endif
+ }
+
+ STATE_LOOKUP();
+
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_IN) {
+ pf_change_icmp(pd2.src, &iih.icmp6_id,
+ daddr, &(*state)->state_key->lan.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->lan.xport.port, NULL,
+#else
+ (*state)->state_key->lan.port, NULL,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, AF_INET6);
+ } else {
+ pf_change_icmp(pd2.dst, &iih.icmp6_id,
+ saddr, &(*state)->state_key->gwy.addr,
+#ifndef NO_APPLE_EXTENSIONS
+ (*state)->state_key->gwy.xport.port, NULL,
+#else
+ (*state)->state_key->gwy.port, NULL,
+#endif
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, AF_INET6);
+ }
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m, off2 +
+ sizeof (struct icmp6_hdr));
+ if (!m)
+ return (PF_DROP);
+#endif
+ m_copyback(m, off, sizeof (struct icmp6_hdr),
+ pd->hdr.icmp6);
+ m_copyback(m, ipoff2, sizeof (h2_6), &h2_6);
+ m_copyback(m, off2, sizeof (struct icmp6_hdr),
+ &iih);
+ }
+
+ return (PF_PASS);
+ break;
+ }
+#endif /* INET6 */
+ default: {
+ key.af = pd2.af;
+ key.proto = pd2.proto;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd2.dst, key.af);
+ PF_ACPY(&key.gwy.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = 0;
+ key.gwy.xport.port = 0;
+#else
+ key.ext.port = 0;
+ key.gwy.port = 0;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd2.dst, key.af);
+ PF_ACPY(&key.ext.addr, pd2.src, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = 0;
+ key.ext.xport.port = 0;
+#else
+ key.lan.port = 0;
+ key.ext.port = 0;
+#endif
+ }
+
+ STATE_LOOKUP();
+
+ if (STATE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_IN) {
+ pf_change_icmp(pd2.src, NULL,
+ daddr, &(*state)->state_key->lan.addr,
+ 0, NULL,
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, pd2.af);
+ } else {
+ pf_change_icmp(pd2.dst, NULL,
+ saddr, &(*state)->state_key->gwy.addr,
+ 0, NULL,
+ pd2.ip_sum, icmpsum,
+ pd->ip_sum, 0, pd2.af);
+ }
+ switch (pd2.af) {
+#if INET
+ case AF_INET:
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m,
+ ipoff2 + sizeof (h2));
+ if (!m)
+ return (PF_DROP);
+#endif
+ m_copyback(m, off, ICMP_MINLEN,
+ pd->hdr.icmp);
+ m_copyback(m, ipoff2, sizeof (h2), &h2);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+#ifndef NO_APPLE_EXTENSIONS
+ m = pf_lazy_makewritable(pd, m,
+ ipoff2 + sizeof (h2_6));
+ if (!m)
+ return (PF_DROP);
+#endif
+ m_copyback(m, off,
+ sizeof (struct icmp6_hdr),
+ pd->hdr.icmp6);
+ m_copyback(m, ipoff2, sizeof (h2_6),
+ &h2_6);
+ break;
+#endif /* INET6 */
+ }
+ }
+
+ return (PF_PASS);
+ break;
+ }
+ }
+ }
+}
+
+#ifndef NO_APPLE_EXTENSIONS
+static int
+pf_test_state_grev1(struct pf_state **state, int direction,
+ struct pfi_kif *kif, int off, struct pf_pdesc *pd)
+{
+ struct pf_state_peer *src;
+ struct pf_state_peer *dst;
+ struct pf_state_key_cmp key;
+ struct pf_grev1_hdr *grev1 = pd->hdr.grev1;
+ struct mbuf *m;
+
+#ifndef NO_APPLE_EXTENSIONS
+ key.app_state = 0;
+#endif
+ key.af = pd->af;
+ key.proto = IPPROTO_GRE;
+ key.proto_variant = PF_GRE_PPTP_VARIANT;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd->src, key.af);
+ PF_ACPY(&key.gwy.addr, pd->dst, key.af);
+ key.gwy.xport.call_id = grev1->call_id;
+ } else {
+ PF_ACPY(&key.lan.addr, pd->src, key.af);
+ PF_ACPY(&key.ext.addr, pd->dst, key.af);
+ key.ext.xport.call_id = grev1->call_id;
+ }
+
+ STATE_LOOKUP();
+
+ if (direction == (*state)->state_key->direction) {
+ src = &(*state)->src;
+ dst = &(*state)->dst;
+ } else {
+ src = &(*state)->dst;
+ dst = &(*state)->src;
+ }
+
+ /* update states */
+ if (src->state < PFGRE1S_INITIATING)
+ src->state = PFGRE1S_INITIATING;
+
+ /* update expire time */
+ (*state)->expire = pf_time_second();
+ if (src->state >= PFGRE1S_INITIATING &&
+ dst->state >= PFGRE1S_INITIATING) {
+ (*state)->timeout = PFTM_GREv1_ESTABLISHED;
+ src->state = PFGRE1S_ESTABLISHED;
+ dst->state = PFGRE1S_ESTABLISHED;
+ } else {
+ (*state)->timeout = PFTM_GREv1_INITIATING;
+ }
+ /* translate source/destination address, if necessary */
+ if (STATE_GRE_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_OUT) {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&pd->src->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->gwy.addr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(pd->src, &(*state)->state_key->gwy.addr,
+ pd->af);
+ break;
+#endif /* INET6 */
+ }
+ } else {
+ grev1->call_id = (*state)->state_key->lan.xport.call_id;
+
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&pd->dst->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->lan.addr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(pd->dst, &(*state)->state_key->lan.addr,
+ pd->af);
+ break;
+#endif /* INET6 */
+ }
+ }
+
+ m = pf_lazy_makewritable(pd, pd->mp, off + sizeof (*grev1));
+ if (!m)
+ return (PF_DROP);
+ m_copyback(m, off, sizeof (*grev1), grev1);
+ }
+
+ return (PF_PASS);
+}
+
+int
+pf_test_state_esp(struct pf_state **state, int direction, struct pfi_kif *kif,
+ int off, struct pf_pdesc *pd)
+{
+#pragma unused(off)
+ struct pf_state_peer *src;
+ struct pf_state_peer *dst;
+ struct pf_state_key_cmp key;
+ struct pf_esp_hdr *esp = pd->hdr.esp;
+ int action;
+
+ memset(&key, 0, sizeof (key));
+ key.af = pd->af;
+ key.proto = IPPROTO_ESP;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd->src, key.af);
+ PF_ACPY(&key.gwy.addr, pd->dst, key.af);
+ key.gwy.xport.spi = esp->spi;
+ } else {
+ PF_ACPY(&key.lan.addr, pd->src, key.af);
+ PF_ACPY(&key.ext.addr, pd->dst, key.af);
+ key.ext.xport.spi = esp->spi;
+ }
+
+ *state = pf_find_state(kif, &key, direction);
+
+ if (*state == 0) {
+ struct pf_state *s;
+
+ /*
+ * <jhw@apple.com>
+ * No matching state. Look for a blocking state. If we find
+ * one, then use that state and move it so that it's keyed to
+ * the SPI in the current packet.
+ */
+ if (direction == PF_IN) {
+ key.gwy.xport.spi = 0;
+
+ s = pf_find_state(kif, &key, direction);
+ if (s) {
+ struct pf_state_key *sk = s->state_key;
+
+ RB_REMOVE(pf_state_tree_ext_gwy,
+ &pf_statetbl_ext_gwy, sk);
+ sk->lan.xport.spi = sk->gwy.xport.spi =
+ esp->spi;
+
+ if (RB_INSERT(pf_state_tree_ext_gwy,
+ &pf_statetbl_ext_gwy, sk))
+ pf_detach_state(s, PF_DT_SKIP_EXTGWY);
+ else
+ *state = s;
+ }
+ } else {
+ key.ext.xport.spi = 0;
+
+ s = pf_find_state(kif, &key, direction);
+ if (s) {
+ struct pf_state_key *sk = s->state_key;
+
+ RB_REMOVE(pf_state_tree_lan_ext,
+ &pf_statetbl_lan_ext, sk);
+ sk->ext.xport.spi = esp->spi;
+
+ if (RB_INSERT(pf_state_tree_lan_ext,
+ &pf_statetbl_lan_ext, sk))
+ pf_detach_state(s, PF_DT_SKIP_LANEXT);
+ else
+ *state = s;
+ }
+ }
+
+ if (s) {
+ if (*state == 0) {
+#if NPFSYNC
+ if (s->creatorid == pf_status.hostid)
+ pfsync_delete_state(s);
+#endif
+ s->timeout = PFTM_UNLINKED;
+ hook_runloop(&s->unlink_hooks,
+ HOOK_REMOVE|HOOK_FREE);
+ pf_src_tree_remove_state(s);
+ pf_free_state(s);
+ return (PF_DROP);
+ }
+ }
+ }
+
+ if (pf_state_lookup_aux(state, kif, direction, &action))
+ return (action);
+
+ if (direction == (*state)->state_key->direction) {
+ src = &(*state)->src;
+ dst = &(*state)->dst;
+ } else {
+ src = &(*state)->dst;
+ dst = &(*state)->src;
+ }
+
+ /* update states */
+ if (src->state < PFESPS_INITIATING)
+ src->state = PFESPS_INITIATING;
+
+ /* update expire time */
+ (*state)->expire = pf_time_second();
+ if (src->state >= PFESPS_INITIATING &&
+ dst->state >= PFESPS_INITIATING) {
+ (*state)->timeout = PFTM_ESP_ESTABLISHED;
+ src->state = PFESPS_ESTABLISHED;
+ dst->state = PFESPS_ESTABLISHED;
+ } else {
+ (*state)->timeout = PFTM_ESP_INITIATING;
+ }
+ /* translate source/destination address, if necessary */
+ if (STATE_ADDR_TRANSLATE((*state)->state_key)) {
+ if (direction == PF_OUT) {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&pd->src->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->gwy.addr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(pd->src, &(*state)->state_key->gwy.addr,
+ pd->af);
+ break;
+#endif /* INET6 */
+ }
+ } else {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&pd->dst->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->lan.addr.v4.s_addr, 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(pd->dst, &(*state)->state_key->lan.addr,
+ pd->af);
+ break;
+#endif /* INET6 */
+ }
+ }
+ }
+
+ return (PF_PASS);
+}
+#endif
+
+static int
+pf_test_state_other(struct pf_state **state, int direction, struct pfi_kif *kif,
+ struct pf_pdesc *pd)
+{
+ struct pf_state_peer *src, *dst;
+ struct pf_state_key_cmp key;
+
+#ifndef NO_APPLE_EXTENSIONS
+ key.app_state = 0;
+#endif
+ key.af = pd->af;
+ key.proto = pd->proto;
+ if (direction == PF_IN) {
+ PF_ACPY(&key.ext.addr, pd->src, key.af);
+ PF_ACPY(&key.gwy.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.ext.xport.port = 0;
+ key.gwy.xport.port = 0;
+#else
+ key.ext.port = 0;
+ key.gwy.port = 0;
+#endif
+ } else {
+ PF_ACPY(&key.lan.addr, pd->src, key.af);
+ PF_ACPY(&key.ext.addr, pd->dst, key.af);
+#ifndef NO_APPLE_EXTENSIONS
+ key.lan.xport.port = 0;
+ key.ext.xport.port = 0;
+#else
+ key.lan.port = 0;
+ key.ext.port = 0;
+#endif
+ }
+
+ STATE_LOOKUP();
+
+ if (direction == (*state)->state_key->direction) {
+ src = &(*state)->src;
+ dst = &(*state)->dst;
+ } else {
+ src = &(*state)->dst;
+ dst = &(*state)->src;
+ }
+
+ /* update states */
+ if (src->state < PFOTHERS_SINGLE)
+ src->state = PFOTHERS_SINGLE;
+ if (dst->state == PFOTHERS_SINGLE)
+ dst->state = PFOTHERS_MULTIPLE;
+
+ /* update expire time */
+ (*state)->expire = pf_time_second();
+ if (src->state == PFOTHERS_MULTIPLE && dst->state == PFOTHERS_MULTIPLE)
+ (*state)->timeout = PFTM_OTHER_MULTIPLE;
+ else
+ (*state)->timeout = PFTM_OTHER_SINGLE;
+
+ /* translate source/destination address, if necessary */
+#ifndef NO_APPLE_EXTENSIONS
+ if (STATE_ADDR_TRANSLATE((*state)->state_key)) {
+#else
+ if (STATE_TRANSLATE((*state)->state_key)) {
+#endif
+ if (direction == PF_OUT) {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&pd->src->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->gwy.addr.v4.s_addr,
+ 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(pd->src,
+ &(*state)->state_key->gwy.addr, pd->af);
+ break;
+#endif /* INET6 */
+ }
+ } else {
+ switch (pd->af) {
+#if INET
+ case AF_INET:
+ pf_change_a(&pd->dst->v4.s_addr,
+ pd->ip_sum,
+ (*state)->state_key->lan.addr.v4.s_addr,
+ 0);
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ PF_ACPY(pd->dst,
+ &(*state)->state_key->lan.addr, pd->af);
+ break;
+#endif /* INET6 */
+ }
+ }
+ }
+
+ return (PF_PASS);
+}
+
+/*
+ * ipoff and off are measured from the start of the mbuf chain.
+ * h must be at "ipoff" on the mbuf chain.
+ */
+void *
+pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
+ u_short *actionp, u_short *reasonp, sa_family_t af)
+{
+ switch (af) {
+#if INET
+ case AF_INET: {
+ struct ip *h = mtod(m, struct ip *);
+ u_int16_t fragoff = (ntohs(h->ip_off) & IP_OFFMASK) << 3;
+
+ if (fragoff) {
+ if (fragoff >= len) {
+ ACTION_SET(actionp, PF_PASS);
+ } else {
+ ACTION_SET(actionp, PF_DROP);
+ REASON_SET(reasonp, PFRES_FRAG);
+ }
+ return (NULL);
+ }
+ if (m->m_pkthdr.len < off + len ||
+ ntohs(h->ip_len) < off + len) {
+ ACTION_SET(actionp, PF_DROP);
+ REASON_SET(reasonp, PFRES_SHORT);
+ return (NULL);
+ }
+ break;
+ }
+#endif /* INET */
+#if INET6
+ case AF_INET6: {
+ struct ip6_hdr *h = mtod(m, struct ip6_hdr *);
+
+ if (m->m_pkthdr.len < off + len ||
+ (ntohs(h->ip6_plen) + sizeof (struct ip6_hdr)) <
+ (unsigned)(off + len)) {
+ ACTION_SET(actionp, PF_DROP);
+ REASON_SET(reasonp, PFRES_SHORT);
+ return (NULL);
+ }
+ break;
+ }
+#endif /* INET6 */
+ }
+ m_copydata(m, off, len, p);
+ return (p);
+}
+
+int
+pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif)
+{
+#pragma unused(kif)
+ struct sockaddr_in *dst;
+ int ret = 1;
+#if INET6
+ struct sockaddr_in6 *dst6;
+ struct route_in6 ro;
+#else
+ struct route ro;
+#endif
+
+ bzero(&ro, sizeof (ro));
+ switch (af) {
+ case AF_INET:
+ dst = satosin(&ro.ro_dst);
+ dst->sin_family = AF_INET;
+ dst->sin_len = sizeof (*dst);
+ dst->sin_addr = addr->v4;
+ break;
+#if INET6
+ case AF_INET6:
+ dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
+ dst6->sin6_family = AF_INET6;
+ dst6->sin6_len = sizeof (*dst6);
+ dst6->sin6_addr = addr->v6;
+ break;
+#endif /* INET6 */
+ default:
+ return (0);
+ }
+
+ /* XXX: IFT_ENC is not currently used by anything*/
+ /* Skip checks for ipsec interfaces */
+ if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
+ goto out;
+
+ rtalloc((struct route *)&ro);
+
+out:
+ if (ro.ro_rt != NULL)
+ RTFREE(ro.ro_rt);
+ return (ret);
+}
+
+int
+pf_rtlabel_match(struct pf_addr *addr, sa_family_t af, struct pf_addr_wrap *aw)
+{
+#pragma unused(aw)
+ struct sockaddr_in *dst;
+#if INET6
+ struct sockaddr_in6 *dst6;
+ struct route_in6 ro;
+#else
+ struct route ro;
+#endif
+ int ret = 0;
+
+ bzero(&ro, sizeof (ro));
+ switch (af) {
+ case AF_INET:
+ dst = satosin(&ro.ro_dst);
+ dst->sin_family = AF_INET;
+ dst->sin_len = sizeof (*dst);
+ dst->sin_addr = addr->v4;
+ break;
+#if INET6
+ case AF_INET6:
+ dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
+ dst6->sin6_family = AF_INET6;
+ dst6->sin6_len = sizeof (*dst6);
+ dst6->sin6_addr = addr->v6;
+ break;
+#endif /* INET6 */
+ default:
+ return (0);
+ }
+
+ rtalloc((struct route *)&ro);
+
+ if (ro.ro_rt != NULL) {
+ RTFREE(ro.ro_rt);
+ }
+
+ return (ret);
+}
+
+#if INET
+static void
+pf_route(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
+ struct pf_state *s, struct pf_pdesc *pd)
+{
+#pragma unused(pd)
+ struct mbuf *m0, *m1;
+ struct route iproute;
+ struct route *ro = NULL;
+ struct sockaddr_in *dst;
+ struct ip *ip;
+ struct ifnet *ifp = NULL;
+ struct pf_addr naddr;
+ struct pf_src_node *sn = NULL;
+ int error = 0;
+ int sw_csum = 0;
+
+ if (m == NULL || *m == NULL || r == NULL ||
+ (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
+ panic("pf_route: invalid parameters");
+
+ if (pd->pf_mtag->routed++ > 3) {
+ m0 = *m;
+ *m = NULL;
+ goto bad;
+ }
+
+ if (r->rt == PF_DUPTO) {
+ if ((m0 = m_copym(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
+ return;
+ } else {
+ if ((r->rt == PF_REPLYTO) == (r->direction == dir))
+ return;
+ m0 = *m;
+ }
+
+ if (m0->m_len < (int)sizeof (struct ip)) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_route: m0->m_len < sizeof (struct ip)\n"));
+ goto bad;
+ }
+
+ ip = mtod(m0, struct ip *);
+
+ ro = &iproute;
+ bzero((caddr_t)ro, sizeof (*ro));
+ dst = satosin(&ro->ro_dst);
+ dst->sin_family = AF_INET;
+ dst->sin_len = sizeof (*dst);
+ dst->sin_addr = ip->ip_dst;
+
+ if (r->rt == PF_FASTROUTE) {
+ rtalloc(ro);
+ if (ro->ro_rt == 0) {
+ ipstat.ips_noroute++;
+ goto bad;
+ }
+
+ ifp = ro->ro_rt->rt_ifp;
+ ro->ro_rt->rt_use++;
+
+ if (ro->ro_rt->rt_flags & RTF_GATEWAY)
+ dst = satosin(ro->ro_rt->rt_gateway);
+ } else {
+ if (TAILQ_EMPTY(&r->rpool.list)) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_route: TAILQ_EMPTY(&r->rpool.list)\n"));
+ goto bad;
+ }
+ if (s == NULL) {
+ pf_map_addr(AF_INET, r, (struct pf_addr *)&ip->ip_src,
+ &naddr, NULL, &sn);
+ if (!PF_AZERO(&naddr, AF_INET))
+ dst->sin_addr.s_addr = naddr.v4.s_addr;
+ ifp = r->rpool.cur->kif ?
+ r->rpool.cur->kif->pfik_ifp : NULL;
+ } else {
+ if (!PF_AZERO(&s->rt_addr, AF_INET))
+ dst->sin_addr.s_addr =
+ s->rt_addr.v4.s_addr;
+ ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
+ }
+ }
+ if (ifp == NULL)
+ goto bad;
+
+ if (oifp != ifp) {
+ if (pf_test(PF_OUT, ifp, &m0, NULL) != PF_PASS)
+ goto bad;
+ else if (m0 == NULL)
+ goto done;
+ if (m0->m_len < (int)sizeof (struct ip)) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_route: m0->m_len < sizeof (struct ip)\n"));
+ goto bad;
+ }
+ ip = mtod(m0, struct ip *);
+ }
+
+ /* Copied from ip_output. */
+
+ /* Catch routing changes wrt. hardware checksumming for TCP or UDP. */
+ m0->m_pkthdr.csum_flags |= CSUM_IP;
+ sw_csum = m0->m_pkthdr.csum_flags &
+ ~IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
+
+ if (ifp->if_hwassist & CSUM_TCP_SUM16) {
+ /*
+ * Special case code for GMACE
+ * frames that can be checksumed by GMACE SUM16 HW:
+ * frame >64, no fragments, no UDP
+ */
+ if (apple_hwcksum_tx && (m0->m_pkthdr.csum_flags & CSUM_TCP) &&
+ (ntohs(ip->ip_len) > 50) &&
+ (ntohs(ip->ip_len) <= ifp->if_mtu)) {
+ /*
+ * Apple GMAC HW, expects:
+ * STUFF_OFFSET << 16 | START_OFFSET
+ */
+ /* IP+Enet header length */
+ u_short offset = ((ip->ip_hl) << 2) + 14;
+ u_short csumprev = m0->m_pkthdr.csum_data & 0xffff;
+ m0->m_pkthdr.csum_flags = CSUM_DATA_VALID |
+ CSUM_TCP_SUM16; /* for GMAC */
+ m0->m_pkthdr.csum_data = (csumprev + offset) << 16 ;
+ m0->m_pkthdr.csum_data += offset;
+ /* do IP hdr chksum in software */
+ sw_csum = CSUM_DELAY_IP;
+ } else {
+ /* let the software handle any UDP or TCP checksums */
+ sw_csum |= (CSUM_DELAY_DATA & m0->m_pkthdr.csum_flags);
+ }
+ } else if (apple_hwcksum_tx == 0) {
+ sw_csum |= (CSUM_DELAY_DATA | CSUM_DELAY_IP) &
+ m0->m_pkthdr.csum_flags;
+ }
+
+ if (sw_csum & CSUM_DELAY_DATA) {
+ in_delayed_cksum(m0);
+ sw_csum &= ~CSUM_DELAY_DATA;
+ m0->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
+ }
+
+ if (apple_hwcksum_tx != 0) {
+ m0->m_pkthdr.csum_flags &=
+ IF_HWASSIST_CSUM_FLAGS(ifp->if_hwassist);
+ } else {
+ m0->m_pkthdr.csum_flags = 0;
+ }
+
+ if (ntohs(ip->ip_len) <= ifp->if_mtu ||
+ (ifp->if_hwassist & CSUM_FRAGMENT)) {
+ ip->ip_sum = 0;
+ if (sw_csum & CSUM_DELAY_IP)
+ ip->ip_sum = in_cksum(m0, ip->ip_hl << 2);
+ error = ifnet_output(ifp, PF_INET, m0, ro, sintosa(dst));
+ goto done;
+ }
+
+ /*
+ * Too large for interface; fragment if possible.
+ * Must be able to put at least 8 bytes per fragment.
+ */
+ if (ip->ip_off & htons(IP_DF)) {
+ ipstat.ips_cantfrag++;
+ if (r->rt != PF_DUPTO) {
+ icmp_error(m0, ICMP_UNREACH, ICMP_UNREACH_NEEDFRAG, 0,
+ ifp->if_mtu);
+ goto done;
+ } else
+ goto bad;
+ }
+
+ m1 = m0;
+ error = ip_fragment(m0, ifp, ifp->if_mtu, sw_csum);
+ if (error) {
+ m0 = NULL;
+ goto bad;
+ }
+
+ for (m0 = m1; m0; m0 = m1) {
+ m1 = m0->m_nextpkt;
+ m0->m_nextpkt = 0;
+ if (error == 0)
+ error = ifnet_output(ifp, PF_INET, m0, ro,
+ sintosa(dst));
+ else
+ m_freem(m0);
+ }
+
+ if (error == 0)
+ ipstat.ips_fragmented++;
+
+done:
+ if (r->rt != PF_DUPTO)
+ *m = NULL;
+ if (ro == &iproute && ro->ro_rt)
+ RTFREE(ro->ro_rt);
+ return;
+
+bad:
+ m_freem(m0);
+ goto done;
+}
+#endif /* INET */
+
+#if INET6
+static void
+pf_route6(struct mbuf **m, struct pf_rule *r, int dir, struct ifnet *oifp,
+ struct pf_state *s, struct pf_pdesc *pd)
+{
+#pragma unused(pd)
+ struct mbuf *m0;
+ struct route_in6 ip6route;
+ struct route_in6 *ro;
+ struct sockaddr_in6 *dst;
+ struct ip6_hdr *ip6;
+ struct ifnet *ifp = NULL;
+ struct pf_addr naddr;
+ struct pf_src_node *sn = NULL;
+ int error = 0;
+
+ if (m == NULL || *m == NULL || r == NULL ||
+ (dir != PF_IN && dir != PF_OUT) || oifp == NULL)
+ panic("pf_route6: invalid parameters");
+
+ if (pd->pf_mtag->routed++ > 3) {
+ m0 = *m;
+ *m = NULL;
+ goto bad;
+ }
+
+ if (r->rt == PF_DUPTO) {
+ if ((m0 = m_copym(*m, 0, M_COPYALL, M_NOWAIT)) == NULL)
+ return;
+ } else {
+ if ((r->rt == PF_REPLYTO) == (r->direction == dir))
+ return;
+ m0 = *m;
+ }
+
+ if (m0->m_len < (int)sizeof (struct ip6_hdr)) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_route6: m0->m_len < sizeof (struct ip6_hdr)\n"));
+ goto bad;
+ }
+ ip6 = mtod(m0, struct ip6_hdr *);
+
+ ro = &ip6route;
+ bzero((caddr_t)ro, sizeof (*ro));
+ dst = (struct sockaddr_in6 *)&ro->ro_dst;
+ dst->sin6_family = AF_INET6;
+ dst->sin6_len = sizeof (*dst);
+ dst->sin6_addr = ip6->ip6_dst;
+
+ /* Cheat. XXX why only in the v6 case??? */
+ if (r->rt == PF_FASTROUTE) {
+ struct pf_mtag *pf_mtag;
+
+ if ((pf_mtag = pf_get_mtag(m0)) == NULL)
+ goto bad;
+ pf_mtag->flags |= PF_TAG_GENERATED;
+ ip6_output(m0, NULL, NULL, 0, NULL, NULL, 0);
+ return;
+ }
+
+ if (TAILQ_EMPTY(&r->rpool.list)) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_route6: TAILQ_EMPTY(&r->rpool.list)\n"));
+ goto bad;
+ }
+ if (s == NULL) {
+ pf_map_addr(AF_INET6, r, (struct pf_addr *)&ip6->ip6_src,
+ &naddr, NULL, &sn);
+ if (!PF_AZERO(&naddr, AF_INET6))
+ PF_ACPY((struct pf_addr *)&dst->sin6_addr,
+ &naddr, AF_INET6);
+ ifp = r->rpool.cur->kif ? r->rpool.cur->kif->pfik_ifp : NULL;
+ } else {
+ if (!PF_AZERO(&s->rt_addr, AF_INET6))
+ PF_ACPY((struct pf_addr *)&dst->sin6_addr,
+ &s->rt_addr, AF_INET6);
+ ifp = s->rt_kif ? s->rt_kif->pfik_ifp : NULL;
+ }
+ if (ifp == NULL)
+ goto bad;
+
+ if (oifp != ifp) {
+ if (pf_test6(PF_OUT, ifp, &m0, NULL) != PF_PASS)
+ goto bad;
+ else if (m0 == NULL)
+ goto done;
+ if (m0->m_len < (int)sizeof (struct ip6_hdr)) {
+ DPFPRINTF(PF_DEBUG_URGENT, ("pf_route6: m0->m_len "
+ "< sizeof (struct ip6_hdr)\n"));
+ goto bad;
+ }
+ ip6 = mtod(m0, struct ip6_hdr *);
+ }
+
+ /*
+ * If the packet is too large for the outgoing interface,
+ * send back an icmp6 error.
+ */
+ if (IN6_IS_SCOPE_EMBED(&dst->sin6_addr))
+ dst->sin6_addr.s6_addr16[1] = htons(ifp->if_index);
+ if ((unsigned)m0->m_pkthdr.len <= ifp->if_mtu) {
+ error = nd6_output(ifp, ifp, m0, dst, NULL, 0);
+ } else {
+ in6_ifstat_inc(ifp, ifs6_in_toobig);
+ if (r->rt != PF_DUPTO)
+ icmp6_error(m0, ICMP6_PACKET_TOO_BIG, 0, ifp->if_mtu);
+ else
+ goto bad;
+ }
+
+done:
+ if (r->rt != PF_DUPTO)
+ *m = NULL;
+ return;
+
+bad:
+ m_freem(m0);
+ goto done;
+}
+#endif /* INET6 */
+
+
+/*
+ * check protocol (tcp/udp/icmp/icmp6) checksum and set mbuf flag
+ * off is the offset where the protocol header starts
+ * len is the total length of protocol header plus payload
+ * returns 0 when the checksum is valid, otherwise returns 1.
+ */
+static int
+pf_check_proto_cksum(struct mbuf *m, int off, int len, u_int8_t p,
+ sa_family_t af)
+{
+ u_int16_t sum;
+
+ switch (p) {
+ case IPPROTO_TCP:
+ case IPPROTO_UDP:
+ /*
+ * Optimize for the common case; if the hardware calculated
+ * value doesn't include pseudo-header checksum, or if it
+ * is partially-computed (only 16-bit summation), do it in
+ * software below.
+ */
+ if (apple_hwcksum_rx && (m->m_pkthdr.csum_flags &
+ (CSUM_DATA_VALID | CSUM_PSEUDO_HDR)) &&
+ (m->m_pkthdr.csum_data ^ 0xffff) == 0) {
+ return (0);
+ }
+ break;
+ case IPPROTO_ICMP:
+#if INET6
+ case IPPROTO_ICMPV6:
+#endif /* INET6 */
+ break;
+ default:
+ return (1);
+ }
+ if (off < (int)sizeof (struct ip) || len < (int)sizeof (struct udphdr))
+ return (1);
+ if (m->m_pkthdr.len < off + len)
+ return (1);
+ switch (af) {
+#if INET
+ case AF_INET:
+ if (p == IPPROTO_ICMP) {
+ if (m->m_len < off)
+ return (1);
+ m->m_data += off;
+ m->m_len -= off;
+ sum = in_cksum(m, len);
+ m->m_data -= off;
+ m->m_len += off;
+ } else {
+ if (m->m_len < (int)sizeof (struct ip))
+ return (1);
+ sum = inet_cksum(m, p, off, len);
+ }
+ break;
+#endif /* INET */
+#if INET6
+ case AF_INET6:
+ if (m->m_len < (int)sizeof (struct ip6_hdr))
+ return (1);
+ sum = inet6_cksum(m, p, off, len);
+ break;
+#endif /* INET6 */
+ default:
+ return (1);
+ }
+ if (sum) {
+ switch (p) {
+ case IPPROTO_TCP:
+ tcpstat.tcps_rcvbadsum++;
+ break;
+ case IPPROTO_UDP:
+ udpstat.udps_badsum++;
+ break;
+ case IPPROTO_ICMP:
+ icmpstat.icps_checksum++;
+ break;
+#if INET6
+ case IPPROTO_ICMPV6:
+ icmp6stat.icp6s_checksum++;
+ break;
+#endif /* INET6 */
+ }
+ return (1);
+ }
+ return (0);
+}
+
+#if INET
+#ifndef NO_APPLE_EXTENSIONS
+#define PF_APPLE_UPDATE_PDESC_IPv4() \
+ do { \
+ if (m && pd.mp && m != pd.mp) { \
+ m = pd.mp; \
+ h = mtod(m, struct ip *); \
+ } \
+ } while (0)
+#else
+#define PF_APPLE_UPDATE_PDESC_IPv4()
+#endif
+
+int
+pf_test(int dir, struct ifnet *ifp, struct mbuf **m0,
+ struct ether_header *eh)
+{
+ struct pfi_kif *kif;
+ u_short action, reason = 0, log = 0;
+ struct mbuf *m = *m0;
+ struct ip *h = 0;
+ struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
+ struct pf_state *s = NULL;
+ struct pf_state_key *sk = NULL;
+ struct pf_ruleset *ruleset = NULL;
+ struct pf_pdesc pd;
+ int off, dirndx, pqid = 0;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (!pf_status.running)
+ return (PF_PASS);
+
+ memset(&pd, 0, sizeof (pd));
+
+ if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_test: pf_get_mtag returned NULL\n"));
+ return (PF_DROP);
+ }
+
+ if (pd.pf_mtag->flags & PF_TAG_GENERATED)
+ return (PF_PASS);
+
+ kif = (struct pfi_kif *)ifp->if_pf_kif;
+
+ if (kif == NULL) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_test: kif == NULL, if_name %s\n", ifp->if_name));
+ return (PF_DROP);
+ }
+ if (kif->pfik_flags & PFI_IFLAG_SKIP)
+ return (PF_PASS);
+
+#ifdef DIAGNOSTIC
+ if ((m->m_flags & M_PKTHDR) == 0)
+ panic("non-M_PKTHDR is passed to pf_test");
+#endif /* DIAGNOSTIC */
+
+ if (m->m_pkthdr.len < (int)sizeof (*h)) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ log = 1;
+ goto done;
+ }
+
+ /* We do IP header normalization and packet reassembly here */
+ if (pf_normalize_ip(m0, dir, kif, &reason, &pd) != PF_PASS) {
+ action = PF_DROP;
+ goto done;
+ }
+ m = *m0; /* pf_normalize messes with m0 */
+ h = mtod(m, struct ip *);
+
+ off = h->ip_hl << 2;
+ if (off < (int)sizeof (*h)) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ log = 1;
+ goto done;
+ }
+
+ pd.src = (struct pf_addr *)&h->ip_src;
+ pd.dst = (struct pf_addr *)&h->ip_dst;
+ PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET);
+ pd.ip_sum = &h->ip_sum;
+ pd.proto = h->ip_p;
+#ifndef NO_APPLE_EXTENSIONS
+ pd.proto_variant = 0;
+ pd.mp = m;
+ pd.lmw = 0;
+#endif
+ pd.af = AF_INET;
+ pd.tos = h->ip_tos;
+ pd.tot_len = ntohs(h->ip_len);
+ pd.eh = eh;
+
+ /* handle fragments that didn't get reassembled by normalization */
+ if (h->ip_off & htons(IP_MF | IP_OFFMASK)) {
+ action = pf_test_fragment(&r, dir, kif, m, h,
+ &pd, &a, &ruleset);
+ goto done;
+ }
+
+ switch (h->ip_p) {
+
+ case IPPROTO_TCP: {
+ struct tcphdr th;
+ pd.hdr.tcp = &th;
+ if (!pf_pull_hdr(m, off, &th, sizeof (th),
+ &action, &reason, AF_INET)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ pd.p_len = pd.tot_len - off - (th.th_off << 2);
+ if ((th.th_flags & TH_ACK) && pd.p_len == 0)
+ pqid = 1;
+ action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
+ if (action == PF_DROP)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv4();
+ action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
+ &reason);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv4();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ipintrq);
+ break;
+ }
+
+ case IPPROTO_UDP: {
+ struct udphdr uh;
+
+ pd.hdr.udp = &uh;
+ if (!pf_pull_hdr(m, off, &uh, sizeof (uh),
+ &action, &reason, AF_INET)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ if (uh.uh_dport == 0 ||
+ ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
+ ntohs(uh.uh_ulen) < sizeof (struct udphdr)) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ goto done;
+ }
+ action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv4();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ipintrq);
+ break;
+ }
+
+ case IPPROTO_ICMP: {
+ struct icmp ih;
+
+ pd.hdr.icmp = &ih;
+ if (!pf_pull_hdr(m, off, &ih, ICMP_MINLEN,
+ &action, &reason, AF_INET)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ action = pf_test_state_icmp(&s, dir, kif, m, off, h, &pd,
+ &reason);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv4();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ipintrq);
+ break;
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_ESP: {
+ struct pf_esp_hdr esp;
+
+ pd.hdr.esp = &esp;
+ if (!pf_pull_hdr(m, off, &esp, sizeof (esp), &action, &reason,
+ AF_INET)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ action = pf_test_state_esp(&s, dir, kif, off, &pd);
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv4();
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ipintrq);
+ break;
+ }
+
+ case IPPROTO_GRE: {
+ struct pf_grev1_hdr grev1;
+ pd.hdr.grev1 = &grev1;
+ if (!pf_pull_hdr(m, off, &grev1, sizeof (grev1), &action,
+ &reason, AF_INET)) {
+ log = (action != PF_PASS);
+ goto done;
+ }
+ if ((ntohs(grev1.flags) & PF_GRE_FLAG_VERSION_MASK) == 1 &&
+ ntohs(grev1.protocol_type) == PF_GRE_PPP_ETHERTYPE) {
+ if (ntohs(grev1.payload_length) >
+ m->m_pkthdr.len - off) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ goto done;
+ }
+ pd.proto_variant = PF_GRE_PPTP_VARIANT;
+ action = pf_test_state_grev1(&s, dir, kif, off, &pd);
+ if (pd.lmw < 0) goto done;
+ PF_APPLE_UPDATE_PDESC_IPv4();
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ break;
+ } else if (s == NULL) {
+ action = pf_test_rule(&r, &s, dir, kif, m, off,
+ h, &pd, &a, &ruleset, &ipintrq);
+ if (action == PF_PASS)
+ break;
+ }
+ }
+
+ /* not GREv1/PPTP, so treat as ordinary GRE... */
+ }
+#endif
+
+ default:
+ action = pf_test_state_other(&s, dir, kif, &pd);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv4();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif, m, off, h,
+ &pd, &a, &ruleset, &ipintrq);
+ break;
+ }
+
+done:
+ PF_APPLE_UPDATE_PDESC_IPv4();
+
+ if (action == PF_PASS && h->ip_hl > 5 &&
+ !((s && s->allow_opts) || r->allow_opts)) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_IPOPTIONS);
+ log = 1;
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: dropping packet with ip options [hlen=%u]\n",
+ (unsigned int) h->ip_hl));
+ }
+
+ if ((s && s->tag) || PF_RTABLEID_IS_VALID(r->rtableid))
+ (void) pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0,
+ r->rtableid);
+
+#if ALTQ
+ if (action == PF_PASS && r->qid) {
+ if (pqid || (pd.tos & IPTOS_LOWDELAY))
+ pd.pf_mtag->qid = r->pqid;
+ else
+ pd.pf_mtag->qid = r->qid;
+ /* add hints for ecn */
+ pd.pf_mtag->hdr = h;
+ }
+#endif /* ALTQ */
+
+ /*
+ * connections redirected to loopback should not match sockets
+ * bound specifically to loopback due to security implications,
+ * see tcp_input() and in_pcblookup_listen().
+ */
+ if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
+ pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
+ (s->nat_rule.ptr->action == PF_RDR ||
+ s->nat_rule.ptr->action == PF_BINAT) &&
+ (ntohl(pd.dst->v4.s_addr) >> IN_CLASSA_NSHIFT) == IN_LOOPBACKNET)
+ pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST;
+
+ if (log) {
+ struct pf_rule *lr;
+
+ if (s != NULL && s->nat_rule.ptr != NULL &&
+ s->nat_rule.ptr->log & PF_LOG_ALL)
+ lr = s->nat_rule.ptr;
+ else
+ lr = r;
+ PFLOG_PACKET(kif, h, m, AF_INET, dir, reason, lr, a, ruleset,
+ &pd);
+ }
+
+ kif->pfik_bytes[0][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
+ kif->pfik_packets[0][dir == PF_OUT][action != PF_PASS]++;
+
+ if (action == PF_PASS || r->action == PF_DROP) {
+ dirndx = (dir == PF_OUT);
+ r->packets[dirndx]++;
+ r->bytes[dirndx] += pd.tot_len;
+ if (a != NULL) {
+ a->packets[dirndx]++;
+ a->bytes[dirndx] += pd.tot_len;
+ }
+ if (s != NULL) {
+ sk = s->state_key;
+ if (s->nat_rule.ptr != NULL) {
+ s->nat_rule.ptr->packets[dirndx]++;
+ s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
+ }
+ if (s->src_node != NULL) {
+ s->src_node->packets[dirndx]++;
+ s->src_node->bytes[dirndx] += pd.tot_len;
+ }
+ if (s->nat_src_node != NULL) {
+ s->nat_src_node->packets[dirndx]++;
+ s->nat_src_node->bytes[dirndx] += pd.tot_len;
+ }
+ dirndx = (dir == sk->direction) ? 0 : 1;
+ s->packets[dirndx]++;
+ s->bytes[dirndx] += pd.tot_len;
+ }
+ tr = r;
+ nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
+ if (nr != NULL) {
+ struct pf_addr *x;
+ /*
+ * XXX: we need to make sure that the addresses
+ * passed to pfr_update_stats() are the same than
+ * the addresses used during matching (pfr_match)
+ */
+ if (r == &pf_default_rule) {
+ tr = nr;
+ x = (sk == NULL || sk->direction == dir) ?
+ &pd.baddr : &pd.naddr;
+ } else
+ x = (sk == NULL || sk->direction == dir) ?
+ &pd.naddr : &pd.baddr;
+ if (x == &pd.baddr || s == NULL) {
+ /* we need to change the address */
+ if (dir == PF_OUT)
+ pd.src = x;
+ else
+ pd.dst = x;
+ }
+ }
+ if (tr->src.addr.type == PF_ADDR_TABLE)
+ pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL ||
+ sk->direction == dir) ?
+ pd.src : pd.dst, pd.af,
+ pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
+ tr->src.neg);
+ if (tr->dst.addr.type == PF_ADDR_TABLE)
+ pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL ||
+ sk->direction == dir) ? pd.dst : pd.src, pd.af,
+ pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
+ tr->dst.neg);
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ if (*m0) {
+ if (pd.lmw < 0) {
+ m_freem(*m0);
+ *m0 = NULL;
+ return (PF_DROP);
+ }
+
+ *m0 = m;
+ }
+#endif
+
+ if (action == PF_SYNPROXY_DROP) {
+ m_freem(*m0);
+ *m0 = NULL;
+ action = PF_PASS;
+ } else if (r->rt)
+ /* pf_route can free the mbuf causing *m0 to become NULL */
+ pf_route(m0, r, dir, kif->pfik_ifp, s, &pd);
+
+ return (action);
+}
+#endif /* INET */
+
+#if INET6
+#ifndef NO_APPLE_EXTENSIONS
+#define PF_APPLE_UPDATE_PDESC_IPv6() \
+ do { \
+ if (m && pd.mp && m != pd.mp) { \
+ if (n == m) \
+ n = pd.mp; \
+ m = pd.mp; \
+ h = mtod(m, struct ip6_hdr *); \
+ } \
+ } while (0)
+#else
+#define PF_APPLE_UPDATE_PDESC_IPv6()
+#endif
+
+int
+pf_test6(int dir, struct ifnet *ifp, struct mbuf **m0,
+ struct ether_header *eh)
+{
+ struct pfi_kif *kif;
+ u_short action, reason = 0, log = 0;
+ struct mbuf *m = *m0, *n = NULL;
+ struct ip6_hdr *h;
+ struct pf_rule *a = NULL, *r = &pf_default_rule, *tr, *nr;
+ struct pf_state *s = NULL;
+ struct pf_state_key *sk = NULL;
+ struct pf_ruleset *ruleset = NULL;
+ struct pf_pdesc pd;
+ int off, terminal = 0, dirndx, rh_cnt = 0;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (!pf_status.running)
+ return (PF_PASS);
+
+ memset(&pd, 0, sizeof (pd));
+
+ if ((pd.pf_mtag = pf_get_mtag(m)) == NULL) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_test6: pf_get_mtag returned NULL\n"));
+ return (PF_DROP);
+ }
+
+ if (pd.pf_mtag->flags & PF_TAG_GENERATED)
+ return (PF_PASS);
+
+ kif = (struct pfi_kif *)ifp->if_pf_kif;
+
+ if (kif == NULL) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_test6: kif == NULL, if_name %s\n", ifp->if_name));
+ return (PF_DROP);
+ }
+ if (kif->pfik_flags & PFI_IFLAG_SKIP)
+ return (PF_PASS);
+
+#ifdef DIAGNOSTIC
+ if ((m->m_flags & M_PKTHDR) == 0)
+ panic("non-M_PKTHDR is passed to pf_test6");
+#endif /* DIAGNOSTIC */
+
+ h = mtod(m, struct ip6_hdr *);
+
+ if (m->m_pkthdr.len < (int)sizeof (*h)) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ log = 1;
+ goto done;
+ }
+
+ /* We do IP header normalization and packet reassembly here */
+ if (pf_normalize_ip6(m0, dir, kif, &reason, &pd) != PF_PASS) {
+ action = PF_DROP;
+ goto done;
+ }
+ m = *m0; /* pf_normalize messes with m0 */
+ h = mtod(m, struct ip6_hdr *);
+
+#if 1
+ /*
+ * we do not support jumbogram yet. if we keep going, zero ip6_plen
+ * will do something bad, so drop the packet for now.
+ */
+ if (htons(h->ip6_plen) == 0) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_NORM); /*XXX*/
+ goto done;
+ }
+#endif
+
+ pd.src = (struct pf_addr *)&h->ip6_src;
+ pd.dst = (struct pf_addr *)&h->ip6_dst;
+ PF_ACPY(&pd.baddr, dir == PF_OUT ? pd.src : pd.dst, AF_INET6);
+ pd.ip_sum = NULL;
+ pd.af = AF_INET6;
+ pd.tos = 0;
+ pd.tot_len = ntohs(h->ip6_plen) + sizeof (struct ip6_hdr);
+ pd.eh = eh;
+
+ off = ((caddr_t)h - m->m_data) + sizeof (struct ip6_hdr);
+ pd.proto = h->ip6_nxt;
+#ifndef NO_APPLE_EXTENSIONS
+ pd.proto_variant = 0;
+ pd.mp = m;
+ pd.lmw = 0;
+#endif
+ do {
+ switch (pd.proto) {
+ case IPPROTO_FRAGMENT:
+ action = pf_test_fragment(&r, dir, kif, m, h,
+ &pd, &a, &ruleset);
+ if (action == PF_DROP)
+ REASON_SET(&reason, PFRES_FRAG);
+ goto done;
+ case IPPROTO_ROUTING: {
+ struct ip6_rthdr rthdr;
+
+ if (rh_cnt++) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: IPv6 more than one rthdr\n"));
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_IPOPTIONS);
+ log = 1;
+ goto done;
+ }
+ if (!pf_pull_hdr(m, off, &rthdr, sizeof (rthdr), NULL,
+ &reason, pd.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: IPv6 short rthdr\n"));
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ log = 1;
+ goto done;
+ }
+ if (rthdr.ip6r_type == IPV6_RTHDR_TYPE_0) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: IPv6 rthdr0\n"));
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_IPOPTIONS);
+ log = 1;
+ goto done;
+ }
+ /* FALLTHROUGH */
+ }
+ case IPPROTO_AH:
+ case IPPROTO_HOPOPTS:
+ case IPPROTO_DSTOPTS: {
+ /* get next header and header length */
+ struct ip6_ext opt6;
+
+ if (!pf_pull_hdr(m, off, &opt6, sizeof (opt6),
+ NULL, &reason, pd.af)) {
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: IPv6 short opt\n"));
+ action = PF_DROP;
+ log = 1;
+ goto done;
+ }
+ if (pd.proto == IPPROTO_AH)
+ off += (opt6.ip6e_len + 2) * 4;
+ else
+ off += (opt6.ip6e_len + 1) * 8;
+ pd.proto = opt6.ip6e_nxt;
+ /* goto the next header */
+ break;
+ }
+ default:
+ terminal++;
+ break;
+ }
+ } while (!terminal);
+
+ /* if there's no routing header, use unmodified mbuf for checksumming */
+ if (!n)
+ n = m;
+
+ switch (pd.proto) {
+
+ case IPPROTO_TCP: {
+ struct tcphdr th;
+
+ pd.hdr.tcp = &th;
+ if (!pf_pull_hdr(m, off, &th, sizeof (th),
+ &action, &reason, AF_INET6)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ pd.p_len = pd.tot_len - off - (th.th_off << 2);
+ action = pf_normalize_tcp(dir, kif, m, 0, off, h, &pd);
+ if (action == PF_DROP)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv6();
+ action = pf_test_state_tcp(&s, dir, kif, m, off, h, &pd,
+ &reason);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv6();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ip6intrq);
+ break;
+ }
+
+ case IPPROTO_UDP: {
+ struct udphdr uh;
+
+ pd.hdr.udp = &uh;
+ if (!pf_pull_hdr(m, off, &uh, sizeof (uh),
+ &action, &reason, AF_INET6)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ if (uh.uh_dport == 0 ||
+ ntohs(uh.uh_ulen) > m->m_pkthdr.len - off ||
+ ntohs(uh.uh_ulen) < sizeof (struct udphdr)) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ goto done;
+ }
+ action = pf_test_state_udp(&s, dir, kif, m, off, h, &pd);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv6();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ip6intrq);
+ break;
+ }
+
+ case IPPROTO_ICMPV6: {
+ struct icmp6_hdr ih;
+
+ pd.hdr.icmp6 = &ih;
+ if (!pf_pull_hdr(m, off, &ih, sizeof (ih),
+ &action, &reason, AF_INET6)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ action = pf_test_state_icmp(&s, dir, kif,
+ m, off, h, &pd, &reason);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv6();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ip6intrq);
+ break;
+ }
+
+#ifndef NO_APPLE_EXTENSIONS
+ case IPPROTO_ESP: {
+ struct pf_esp_hdr esp;
+
+ pd.hdr.esp = &esp;
+ if (!pf_pull_hdr(m, off, &esp, sizeof (esp), &action, &reason,
+ AF_INET6)) {
+ log = action != PF_PASS;
+ goto done;
+ }
+ action = pf_test_state_esp(&s, dir, kif, off, &pd);
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv6();
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif,
+ m, off, h, &pd, &a, &ruleset, &ip6intrq);
+ break;
+ }
+
+ case IPPROTO_GRE: {
+ struct pf_grev1_hdr grev1;
+
+ pd.hdr.grev1 = &grev1;
+ if (!pf_pull_hdr(m, off, &grev1, sizeof (grev1), &action,
+ &reason, AF_INET6)) {
+ log = (action != PF_PASS);
+ goto done;
+ }
+ if ((ntohs(grev1.flags) & PF_GRE_FLAG_VERSION_MASK) == 1 &&
+ ntohs(grev1.protocol_type) == PF_GRE_PPP_ETHERTYPE) {
+ if (ntohs(grev1.payload_length) >
+ m->m_pkthdr.len - off) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_SHORT);
+ goto done;
+ }
+ action = pf_test_state_grev1(&s, dir, kif, off, &pd);
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv6();
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ break;
+ } else if (s == NULL) {
+ action = pf_test_rule(&r, &s, dir, kif, m, off,
+ h, &pd, &a, &ruleset, &ip6intrq);
+ if (action == PF_PASS)
+ break;
+ }
+ }
+
+ /* not GREv1/PPTP, so treat as ordinary GRE... */
+ }
+#endif
+
+ default:
+ action = pf_test_state_other(&s, dir, kif, &pd);
+#ifndef NO_APPLE_EXTENSIONS
+ if (pd.lmw < 0)
+ goto done;
+ PF_APPLE_UPDATE_PDESC_IPv6();
+#endif
+ if (action == PF_PASS) {
+#if NPFSYNC
+ pfsync_update_state(s);
+#endif /* NPFSYNC */
+ r = s->rule.ptr;
+ a = s->anchor.ptr;
+ log = s->log;
+ } else if (s == NULL)
+ action = pf_test_rule(&r, &s, dir, kif, m, off, h,
+ &pd, &a, &ruleset, &ip6intrq);
+ break;
+ }
+
+done:
+ PF_APPLE_UPDATE_PDESC_IPv6();
+
+ if (n != m) {
+ m_freem(n);
+ n = NULL;
+ }
+
+ /* handle dangerous IPv6 extension headers. */
+ if (action == PF_PASS && rh_cnt &&
+ !((s && s->allow_opts) || r->allow_opts)) {
+ action = PF_DROP;
+ REASON_SET(&reason, PFRES_IPOPTIONS);
+ log = 1;
+ DPFPRINTF(PF_DEBUG_MISC,
+ ("pf: dropping packet with dangerous v6 headers\n"));
+ }
+
+ if ((s && s->tag) || PF_RTABLEID_IS_VALID(r->rtableid))
+ (void) pf_tag_packet(m, pd.pf_mtag, s ? s->tag : 0,
+ r->rtableid);
+
+#if ALTQ
+ if (action == PF_PASS && r->qid) {
+ if (pd.tos & IPTOS_LOWDELAY)
+ pd.pf_mtag->qid = r->pqid;
+ else
+ pd.pf_mtag->qid = r->qid;
+ /* add hints for ecn */
+ pd.pf_mtag->hdr = h;
+ }
+#endif /* ALTQ */
+
+ if (dir == PF_IN && action == PF_PASS && (pd.proto == IPPROTO_TCP ||
+ pd.proto == IPPROTO_UDP) && s != NULL && s->nat_rule.ptr != NULL &&
+ (s->nat_rule.ptr->action == PF_RDR ||
+ s->nat_rule.ptr->action == PF_BINAT) &&
+ IN6_IS_ADDR_LOOPBACK(&pd.dst->v6))
+ pd.pf_mtag->flags |= PF_TAG_TRANSLATE_LOCALHOST;
+
+ if (log) {
+ struct pf_rule *lr;
+
+ if (s != NULL && s->nat_rule.ptr != NULL &&
+ s->nat_rule.ptr->log & PF_LOG_ALL)
+ lr = s->nat_rule.ptr;
+ else
+ lr = r;
+ PFLOG_PACKET(kif, h, m, AF_INET6, dir, reason, lr, a, ruleset,
+ &pd);
+ }
+
+ kif->pfik_bytes[1][dir == PF_OUT][action != PF_PASS] += pd.tot_len;
+ kif->pfik_packets[1][dir == PF_OUT][action != PF_PASS]++;
+
+ if (action == PF_PASS || r->action == PF_DROP) {
+ dirndx = (dir == PF_OUT);
+ r->packets[dirndx]++;
+ r->bytes[dirndx] += pd.tot_len;
+ if (a != NULL) {
+ a->packets[dirndx]++;
+ a->bytes[dirndx] += pd.tot_len;
+ }
+ if (s != NULL) {
+ sk = s->state_key;
+ if (s->nat_rule.ptr != NULL) {
+ s->nat_rule.ptr->packets[dirndx]++;
+ s->nat_rule.ptr->bytes[dirndx] += pd.tot_len;
+ }
+ if (s->src_node != NULL) {
+ s->src_node->packets[dirndx]++;
+ s->src_node->bytes[dirndx] += pd.tot_len;
+ }
+ if (s->nat_src_node != NULL) {
+ s->nat_src_node->packets[dirndx]++;
+ s->nat_src_node->bytes[dirndx] += pd.tot_len;
+ }
+ dirndx = (dir == sk->direction) ? 0 : 1;
+ s->packets[dirndx]++;
+ s->bytes[dirndx] += pd.tot_len;
+ }
+ tr = r;
+ nr = (s != NULL) ? s->nat_rule.ptr : pd.nat_rule;
+ if (nr != NULL) {
+ struct pf_addr *x;
+ /*
+ * XXX: we need to make sure that the addresses
+ * passed to pfr_update_stats() are the same than
+ * the addresses used during matching (pfr_match)
+ */
+ if (r == &pf_default_rule) {
+ tr = nr;
+ x = (s == NULL || sk->direction == dir) ?
+ &pd.baddr : &pd.naddr;
+ } else {
+ x = (s == NULL || sk->direction == dir) ?
+ &pd.naddr : &pd.baddr;
+ }
+ if (x == &pd.baddr || s == NULL) {
+ if (dir == PF_OUT)
+ pd.src = x;
+ else
+ pd.dst = x;
+ }
+ }
+ if (tr->src.addr.type == PF_ADDR_TABLE)
+ pfr_update_stats(tr->src.addr.p.tbl, (sk == NULL ||
+ sk->direction == dir) ? pd.src : pd.dst, pd.af,
+ pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
+ tr->src.neg);
+ if (tr->dst.addr.type == PF_ADDR_TABLE)
+ pfr_update_stats(tr->dst.addr.p.tbl, (sk == NULL ||
+ sk->direction == dir) ? pd.dst : pd.src, pd.af,
+ pd.tot_len, dir == PF_OUT, r->action == PF_PASS,
+ tr->dst.neg);
+ }
+
+#if 0
+ if (action == PF_SYNPROXY_DROP) {
+ m_freem(*m0);
+ *m0 = NULL;
+ action = PF_PASS;
+ } else if (r->rt)
+ /* pf_route6 can free the mbuf causing *m0 to become NULL */
+ pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
+#else
+#ifndef NO_APPLE_EXTENSIONS
+ if (*m0) {
+ if (pd.lmw < 0) {
+ m_freem(*m0);
+ *m0 = NULL;
+ return (PF_DROP);
+ }
+
+ *m0 = m;
+ }
+
+ if (action == PF_SYNPROXY_DROP) {
+ m_freem(*m0);
+ *m0 = NULL;
+ action = PF_PASS;
+ } else if (r->rt) {
+ if (action == PF_PASS) {
+ m = *m0;
+ h = mtod(m, struct ip6_hdr *);
+ }
+
+ /* pf_route6 can free the mbuf causing *m0 to become NULL */
+ pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
+ }
+#else
+ if (action != PF_SYNPROXY_DROP && r->rt)
+ /* pf_route6 can free the mbuf causing *m0 to become NULL */
+ pf_route6(m0, r, dir, kif->pfik_ifp, s, &pd);
+
+ if (action == PF_PASS) {
+ m = *m0;
+ h = mtod(m, struct ip6_hdr *);
+ }
+
+ if (action == PF_SYNPROXY_DROP) {
+ m_freem(*m0);
+ *m0 = NULL;
+ action = PF_PASS;
+ }
+#endif
+#endif
+
+ return (action);
+}
+#endif /* INET6 */
+
+static int
+pf_check_congestion(struct ifqueue *ifq)
+{
+#pragma unused(ifq)
+ return (0);
+}
+
+void
+pool_init(struct pool *pp, size_t size, unsigned int align, unsigned int ioff,
+ int flags, const char *wchan, void *palloc)
+{
+#pragma unused(align, ioff, flags, palloc)
+ bzero(pp, sizeof (*pp));
+ pp->pool_zone = zinit(size, 1024 * size, PAGE_SIZE, wchan);
+ if (pp->pool_zone != NULL) {
+ zone_change(pp->pool_zone, Z_EXPAND, TRUE);
+ pp->pool_hiwat = pp->pool_limit = (unsigned int)-1;
+ pp->pool_name = wchan;
+ }
+}
+
+/* Zones cannot be currently destroyed */
+void
+pool_destroy(struct pool *pp)
+{
+#pragma unused(pp)
+}
+
+void
+pool_sethiwat(struct pool *pp, int n)
+{
+ pp->pool_hiwat = n; /* Currently unused */
+}
+
+void
+pool_sethardlimit(struct pool *pp, int n, const char *warnmess, int ratecap)
+{
+#pragma unused(warnmess, ratecap)
+ pp->pool_limit = n;
+}
+
+void *
+pool_get(struct pool *pp, int flags)
+{
+ void *buf;
+
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ if (pp->pool_count > pp->pool_limit) {
+ DPFPRINTF(PF_DEBUG_NOISY,
+ ("pf: pool %s hard limit reached (%d)\n",
+ pp->pool_name != NULL ? pp->pool_name : "unknown",
+ pp->pool_limit));
+ pp->pool_fails++;
+ return (NULL);
+ }
+
+ buf = zalloc_canblock(pp->pool_zone, (flags & (PR_NOWAIT | PR_WAITOK)));
+ if (buf != NULL) {
+ pp->pool_count++;
+ VERIFY(pp->pool_count != 0);
+ }
+ return (buf);
+}
+
+void
+pool_put(struct pool *pp, void *v)
+{
+ lck_mtx_assert(pf_lock, LCK_MTX_ASSERT_OWNED);
+
+ zfree(pp->pool_zone, v);
+ VERIFY(pp->pool_count != 0);
+ pp->pool_count--;
+}
+
+struct pf_mtag *
+pf_find_mtag(struct mbuf *m)
+{
+#if !PF_PKTHDR
+ struct m_tag *mtag;
+
+ if ((mtag = m_tag_locate(m, KERNEL_MODULE_TAG_ID,
+ KERNEL_TAG_TYPE_PF, NULL)) == NULL)
+ return (NULL);
+
+ return ((struct pf_mtag *)(mtag + 1));
+#else
+ if (!(m->m_flags & M_PKTHDR))
+ return (NULL);
+
+ return (&m->m_pkthdr.pf_mtag);
+#endif /* PF_PKTHDR */
+}
+
+struct pf_mtag *
+pf_get_mtag(struct mbuf *m)
+{
+#if !PF_PKTHDR
+ struct m_tag *mtag;
+
+ if ((mtag = m_tag_locate(m, KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_PF,
+ NULL)) == NULL) {
+ mtag = m_tag_alloc(KERNEL_MODULE_TAG_ID, KERNEL_TAG_TYPE_PF,
+ sizeof (struct pf_mtag), M_NOWAIT);
+ if (mtag == NULL)
+ return (NULL);
+ bzero(mtag + 1, sizeof (struct pf_mtag));
+ m_tag_prepend(m, mtag);
+ }
+ return ((struct pf_mtag *)(mtag + 1));
+#else
+ return (pf_find_mtag(m));
+#endif /* PF_PKTHDR */
+}
+
+uint64_t
+pf_time_second(void)
+{
+ struct timeval t;
+
+ microtime(&t);
+ return (t.tv_sec);
+}
+
+static void *
+hook_establish(struct hook_desc_head *head, int tail, hook_fn_t fn, void *arg)
+{
+ struct hook_desc *hd;
+
+ hd = _MALLOC(sizeof(*hd), M_DEVBUF, M_WAITOK);
+ if (hd == NULL)
+ return (NULL);
+
+ hd->hd_fn = fn;
+ hd->hd_arg = arg;
+ if (tail)
+ TAILQ_INSERT_TAIL(head, hd, hd_list);
+ else
+ TAILQ_INSERT_HEAD(head, hd, hd_list);
+
+ return (hd);
+}
+
+static void
+hook_runloop(struct hook_desc_head *head, int flags)
+{
+ struct hook_desc *hd;
+
+ if (!(flags & HOOK_REMOVE)) {
+ if (!(flags & HOOK_ABORT))
+ TAILQ_FOREACH(hd, head, hd_list)
+ hd->hd_fn(hd->hd_arg);
+ } else {
+ while (!!(hd = TAILQ_FIRST(head))) {
+ TAILQ_REMOVE(head, hd, hd_list);
+ if (!(flags & HOOK_ABORT))
+ hd->hd_fn(hd->hd_arg);
+ if (flags & HOOK_FREE)
+ _FREE(hd, M_DEVBUF);
+ }
+ }
+}
projects / apple / xnu.git / blobdiff