/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
+ * Copyright (c) 2000-2015 Apple Inc. All rights reserved.
*
- * @APPLE_LICENSE_HEADER_START@
- *
- * Copyright (c) 1999-2003 Apple Computer, 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. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
+ * 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
* Please see the License for the specific language governing rights and
* limitations under the License.
*
- * @APPLE_LICENSE_HEADER_END@
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* Copyright (c) 1982, 1986, 1988, 1990, 1993, 1995
* @(#)tcp_subr.c 8.2 (Berkeley) 5/24/95
* $FreeBSD: src/sys/netinet/tcp_subr.c,v 1.73.2.22 2001/08/22 00:59:12 silby Exp $
*/
-
+/*
+ * NOTICE: This file was modified by SPARTA, Inc. in 2005 to introduce
+ * support for mandatory and extensible security protections. This notice
+ * is included in support of clause 2.2 (b) of the Apple Public License,
+ * Version 2.0.
+ */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
-#if INET6
#include <sys/domain.h>
-#endif
#include <sys/proc.h>
+#include <sys/kauth.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/random.h>
#include <sys/syslog.h>
+#include <sys/mcache.h>
+#include <kern/locks.h>
+#include <kern/zalloc.h>
-
+#include <dev/random/randomdev.h>
#include <net/route.h>
#include <net/if.h>
+#include <net/content_filter.h>
+#define tcp_minmssoverload fring
#define _IP_VHL
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
+#include <netinet/ip_icmp.h>
#if INET6
#include <netinet/ip6.h>
#endif
#endif
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
+#include <netinet/icmp_var.h>
#if INET6
#include <netinet6/ip6_var.h>
#endif
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
+#include <netinet/tcp_cc.h>
+#include <netinet/tcp_cache.h>
+#include <kern/thread_call.h>
+
#if INET6
#include <netinet6/tcp6_var.h>
#endif
#endif
#endif /*IPSEC*/
-#include <sys/md5.h>
+#if NECP
+#include <net/necp.h>
+#endif /* NECP */
+
+#undef tcp_minmssoverload
+
+#if CONFIG_MACF_NET
+#include <security/mac_framework.h>
+#endif /* MAC_NET */
+
+#include <corecrypto/ccaes.h>
+#include <libkern/crypto/aes.h>
+#include <libkern/crypto/md5.h>
#include <sys/kdebug.h>
+#include <mach/sdt.h>
+
+#include <netinet/lro_ext.h>
#define DBG_FNC_TCP_CLOSE NETDBG_CODE(DBG_NETTCP, ((5 << 8) | 2))
+extern int tcp_lq_overflow;
-/* temporary: for testing */
-#if IPSEC
-extern int ipsec_bypass;
-#endif
+extern struct tcptimerlist tcp_timer_list;
+extern struct tcptailq tcp_tw_tailq;
int tcp_mssdflt = TCP_MSS;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_tcp, TCPCTL_MSSDFLT, mssdflt, CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_mssdflt , 0, "Default TCP Maximum Segment Size");
#if INET6
int tcp_v6mssdflt = TCP6_MSS;
SYSCTL_INT(_net_inet_tcp, TCPCTL_V6MSSDFLT, v6mssdflt,
- CTLFLAG_RW, &tcp_v6mssdflt , 0,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_v6mssdflt , 0,
"Default TCP Maximum Segment Size for IPv6");
#endif
-static int tcp_do_rfc1323 = 1;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323, CTLFLAG_RW,
- &tcp_do_rfc1323 , 0, "Enable rfc1323 (high performance TCP) extensions");
+extern int tcp_do_autorcvbuf;
+
+int tcp_sysctl_fastopenkey(struct sysctl_oid *, void *, int ,
+ struct sysctl_req *);
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, fastopen_key,
+ CTLTYPE_STRING | CTLFLAG_WR,
+ 0 , 0, tcp_sysctl_fastopenkey, "S", "TCP Fastopen key");
+/* Current count of half-open TFO connections */
+int tcp_tfo_halfcnt = 0;
+
+/* Maximum of half-open TFO connection backlog */
+int tcp_tfo_backlog = 10;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, fastopen_backlog, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_tfo_backlog, 0, "Backlog queue for half-open TFO connections");
+
+int tcp_fastopen = TCP_FASTOPEN_CLIENT | TCP_FASTOPEN_SERVER;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, fastopen, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_fastopen, 0, "Enable TCP Fastopen (RFC 7413)");
+
+int tcp_tfo_fallback_min = 10;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, fastopen_fallback_min, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_tfo_fallback_min, 0, "Mininum number of trials without TFO when in fallback mode");
+
+/*
+ * Minimum MSS we accept and use. This prevents DoS attacks where
+ * we are forced to a ridiculous low MSS like 20 and send hundreds
+ * of packets instead of one. The effect scales with the available
+ * bandwidth and quickly saturates the CPU and network interface
+ * with packet generation and sending. Set to zero to disable MINMSS
+ * checking. This setting prevents us from sending too small packets.
+ */
+int tcp_minmss = TCP_MINMSS;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, minmss, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_minmss , 0, "Minmum TCP Maximum Segment Size");
+int tcp_do_rfc1323 = 1;
+#if (DEVELOPMENT || DEBUG)
+SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1323, rfc1323,
+ CTLFLAG_RW | CTLFLAG_LOCKED, &tcp_do_rfc1323 , 0,
+ "Enable rfc1323 (high performance TCP) extensions");
+#endif /* (DEVELOPMENT || DEBUG) */
+
+// Not used
static int tcp_do_rfc1644 = 0;
-SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1644, rfc1644, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_tcp, TCPCTL_DO_RFC1644, rfc1644, CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_do_rfc1644 , 0, "Enable rfc1644 (TTCP) extensions");
-static int tcp_tcbhashsize = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD,
- &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
-
-static int do_tcpdrain = 1;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW, &do_tcpdrain, 0,
+static int do_tcpdrain = 0;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, do_tcpdrain, CTLFLAG_RW | CTLFLAG_LOCKED, &do_tcpdrain, 0,
"Enable tcp_drain routine for extra help when low on mbufs");
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD,
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, pcbcount, CTLFLAG_RD | CTLFLAG_LOCKED,
&tcbinfo.ipi_count, 0, "Number of active PCBs");
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, tw_pcbcount,
+ CTLFLAG_RD | CTLFLAG_LOCKED,
+ &tcbinfo.ipi_twcount, 0, "Number of pcbs in time-wait state");
+
static int icmp_may_rst = 1;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_RW, &icmp_may_rst, 0,
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, icmp_may_rst, CTLFLAG_RW | CTLFLAG_LOCKED, &icmp_may_rst, 0,
"Certain ICMP unreachable messages may abort connections in SYN_SENT");
static int tcp_strict_rfc1948 = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, strict_rfc1948, CTLFLAG_RW,
+static int tcp_isn_reseed_interval = 0;
+#if (DEVELOPMENT || DEBUG)
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, strict_rfc1948,
+ CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_strict_rfc1948, 0, "Determines if RFC1948 is followed exactly");
-static int tcp_isn_reseed_interval = 0;
-SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval, CTLFLAG_RW,
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, isn_reseed_interval,
+ CTLFLAG_RW | CTLFLAG_LOCKED,
&tcp_isn_reseed_interval, 0, "Seconds between reseeding of ISN secret");
+#endif /* (DEVELOPMENT || DEBUG) */
+
+int tcp_TCPTV_MIN = 100; /* 100ms minimum RTT */
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, rtt_min, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_TCPTV_MIN, 0, "min rtt value allowed");
+
+int tcp_rexmt_slop = TCPTV_REXMTSLOP;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, rexmt_slop, CTLFLAG_RW,
+ &tcp_rexmt_slop, 0, "Slop added to retransmit timeout");
+
+__private_extern__ int tcp_use_randomport = 0;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, randomize_ports, CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_use_randomport, 0, "Randomize TCP port numbers");
+
+__private_extern__ int tcp_win_scale = 3;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, win_scale_factor,
+ CTLFLAG_RW | CTLFLAG_LOCKED,
+ &tcp_win_scale, 0, "Window scaling factor");
+
+static void tcp_cleartaocache(void);
+static void tcp_notify(struct inpcb *, int);
-static void tcp_cleartaocache __P((void));
-static void tcp_notify __P((struct inpcb *, int));
+struct zone *sack_hole_zone;
+struct zone *tcp_reass_zone;
+struct zone *tcp_bwmeas_zone;
+struct zone *tcp_rxt_seg_zone;
+
+extern int slowlink_wsize; /* window correction for slow links */
+extern int path_mtu_discovery;
+
+extern u_int32_t tcp_autorcvbuf_max;
+extern u_int32_t tcp_autorcvbuf_inc_shift;
+static void tcp_sbrcv_grow_rwin(struct tcpcb *tp, struct sockbuf *sb);
+
+#define TCP_BWMEAS_BURST_MINSIZE 6
+#define TCP_BWMEAS_BURST_MAXSIZE 25
+
+static uint32_t bwmeas_elm_size;
/*
* Target size of TCP PCB hash tables. Must be a power of two.
* variable net.inet.tcp.tcbhashsize
*/
#ifndef TCBHASHSIZE
-#define TCBHASHSIZE 4096
+#define TCBHASHSIZE CONFIG_TCBHASHSIZE
#endif
+__private_extern__ int tcp_tcbhashsize = TCBHASHSIZE;
+SYSCTL_INT(_net_inet_tcp, OID_AUTO, tcbhashsize, CTLFLAG_RD | CTLFLAG_LOCKED,
+ &tcp_tcbhashsize, 0, "Size of TCP control-block hashtable");
+
/*
* This is the actual shape of what we allocate using the zone
* allocator. Doing it this way allows us to protect both structures
* to be changed, eventually, for greater efficiency).
*/
#define ALIGNMENT 32
-#define ALIGNM1 (ALIGNMENT - 1)
struct inp_tp {
- union {
- struct inpcb inp;
- char align[(sizeof(struct inpcb) + ALIGNM1) & ~ALIGNM1];
- } inp_tp_u;
- struct tcpcb tcb;
-#ifndef __APPLE__
- struct callout inp_tp_rexmt, inp_tp_persist, inp_tp_keep, inp_tp_2msl;
- struct callout inp_tp_delack;
-#endif
+ struct inpcb inp;
+ struct tcpcb tcb __attribute__((aligned(ALIGNMENT)));
};
#undef ALIGNMENT
-#undef ALIGNM1
-static struct tcpcb dummy_tcb;
+int get_inpcb_str_size(void);
+int get_tcp_str_size(void);
+static void tcpcb_to_otcpcb(struct tcpcb *, struct otcpcb *);
-extern struct inpcbhead time_wait_slots[];
-extern int cur_tw_slot;
-extern u_long *delack_bitmask;
-extern u_long route_generation;
+static lck_attr_t *tcp_uptime_mtx_attr = NULL; /* mutex attributes */
+static lck_grp_t *tcp_uptime_mtx_grp = NULL; /* mutex group definition */
+static lck_grp_attr_t *tcp_uptime_mtx_grp_attr = NULL; /* mutex group attributes */
+int tcp_notsent_lowat_check(struct socket *so);
+static aes_encrypt_ctx tfo_ctx; /* Crypto-context for TFO */
-int get_inpcb_str_size()
+void
+tcp_tfo_gen_cookie(struct inpcb *inp, u_char *out, size_t blk_size)
{
- return sizeof(struct inpcb);
+ u_char in[CCAES_BLOCK_SIZE];
+#if INET6
+ int isipv6 = inp->inp_vflag & INP_IPV6;
+#endif
+
+ VERIFY(blk_size == CCAES_BLOCK_SIZE);
+
+ bzero(&in[0], CCAES_BLOCK_SIZE);
+ bzero(&out[0], CCAES_BLOCK_SIZE);
+
+#if INET6
+ if (isipv6)
+ memcpy(in, &inp->in6p_faddr, sizeof(struct in6_addr));
+ else
+#endif /* INET6 */
+ memcpy(in, &inp->inp_faddr, sizeof(struct in_addr));
+
+ aes_encrypt_cbc(in, NULL, 1, out, &tfo_ctx);
+}
+
+__private_extern__ int
+tcp_sysctl_fastopenkey(__unused struct sysctl_oid *oidp, __unused void *arg1,
+ __unused int arg2, struct sysctl_req *req)
+{
+ int error = 0;
+ /* TFO-key is expressed as a string in hex format (+1 to account for \0 char) */
+ char keystring[TCP_FASTOPEN_KEYLEN * 2 + 1];
+ u_int32_t key[TCP_FASTOPEN_KEYLEN / sizeof(u_int32_t)];
+ int i;
+
+ /* -1, because newlen is len without the terminating \0 character */
+ if (req->newlen != (sizeof(keystring) - 1)) {
+ error = EINVAL;
+ goto exit;
+ }
+
+ /* sysctl_io_string copies keystring into the oldptr of the sysctl_req.
+ * Make sure everything is zero, to avoid putting garbage in there or
+ * leaking the stack.
+ */
+ bzero(keystring, sizeof(keystring));
+
+ error = sysctl_io_string(req, keystring, sizeof(keystring), 0, NULL);
+ if (error)
+ goto exit;
+
+ for (i = 0; i < (TCP_FASTOPEN_KEYLEN / sizeof(u_int32_t)); i++) {
+ /* We jump over the keystring in 8-character (4 byte in hex) steps */
+ if (sscanf(&keystring[i * 8], "%8x", &key[i]) != 1) {
+ error = EINVAL;
+ goto exit;
+ }
+ }
+
+ aes_encrypt_key128((u_char *)key, &tfo_ctx);
+
+exit:
+ return (error);
}
+int get_inpcb_str_size(void)
+{
+ return sizeof(struct inpcb);
+}
-int get_tcp_str_size()
+int get_tcp_str_size(void)
{
return sizeof(struct tcpcb);
}
-int tcp_freeq __P((struct tcpcb *tp));
+int tcp_freeq(struct tcpcb *tp);
+
+static int scale_to_powerof2(int size);
+
+/*
+ * This helper routine returns one of the following scaled value of size:
+ * 1. Rounded down power of two value of size if the size value passed as
+ * argument is not a power of two and the rounded up value overflows.
+ * OR
+ * 2. Rounded up power of two value of size if the size value passed as
+ * argument is not a power of two and the rounded up value does not overflow
+ * OR
+ * 3. Same value as argument size if it is already a power of two.
+ */
+static int scale_to_powerof2(int size) {
+ /* Handle special case of size = 0 */
+ int ret = size ? size : 1;
+
+ if (!powerof2(ret)) {
+ while(!powerof2(size)) {
+ /*
+ * Clear out least significant
+ * set bit till size is left with
+ * its highest set bit at which point
+ * it is rounded down power of two.
+ */
+ size = size & (size -1);
+ }
+
+ /* Check for overflow when rounding up */
+ if (0 == (size << 1)) {
+ ret = size;
+ } else {
+ ret = size << 1;
+ }
+ }
+
+ return ret;
+}
+
+static void
+tcp_tfo_init()
+{
+ u_char key[TCP_FASTOPEN_KEYLEN];
+ read_random(key, sizeof(key));
+ aes_encrypt_key128(key, &tfo_ctx);
+}
/*
* Tcp initialization
*/
void
-tcp_init()
+tcp_init(struct protosw *pp, struct domain *dp)
{
- int hashsize = TCBHASHSIZE;
+#pragma unused(dp)
+ static int tcp_initialized = 0;
vm_size_t str_size;
- int i;
-
+ struct inpcbinfo *pcbinfo;
+
+ VERIFY((pp->pr_flags & (PR_INITIALIZED|PR_ATTACHED)) == PR_ATTACHED);
+
+ if (tcp_initialized)
+ return;
+ tcp_initialized = 1;
+
tcp_ccgen = 1;
tcp_cleartaocache();
- tcp_delacktime = TCPTV_DELACK;
tcp_keepinit = TCPTV_KEEP_INIT;
tcp_keepidle = TCPTV_KEEP_IDLE;
tcp_keepintvl = TCPTV_KEEPINTVL;
+ tcp_keepcnt = TCPTV_KEEPCNT;
tcp_maxpersistidle = TCPTV_KEEP_IDLE;
tcp_msl = TCPTV_MSL;
+
+ microuptime(&tcp_uptime);
read_random(&tcp_now, sizeof(tcp_now));
- tcp_now = tcp_now & 0x7fffffffffffffff; /* Starts tcp internal 500ms clock at a random value */
+ tcp_now = tcp_now & 0x3fffffff; /* Starts tcp internal clock at a random value */
+ tcp_tfo_init();
LIST_INIT(&tcb);
- tcbinfo.listhead = &tcb;
-#ifndef __APPLE__
- TUNABLE_INT_FETCH("net.inet.tcp.tcbhashsize", &hashsize);
-#endif
- if (!powerof2(hashsize)) {
- printf("WARNING: TCB hash size not a power of 2\n");
- hashsize = 512; /* safe default */
- }
- tcp_tcbhashsize = hashsize;
- tcbinfo.hashsize = hashsize;
- tcbinfo.hashbase = hashinit(hashsize, M_PCB, &tcbinfo.hashmask);
- tcbinfo.porthashbase = hashinit(hashsize, M_PCB,
- &tcbinfo.porthashmask);
-#ifdef __APPLE__
- str_size = (vm_size_t) sizeof(struct inp_tp);
- tcbinfo.ipi_zone = (void *) zinit(str_size, 120000*str_size, 8192, "tcpcb");
-#else
- tcbinfo.ipi_zone = zinit("tcpcb", sizeof(struct inp_tp), maxsockets,
- ZONE_INTERRUPT, 0);
-#endif
+ tcbinfo.ipi_listhead = &tcb;
+
+ pcbinfo = &tcbinfo;
+ /*
+ * allocate lock group attribute and group for tcp pcb mutexes
+ */
+ pcbinfo->ipi_lock_grp_attr = lck_grp_attr_alloc_init();
+ pcbinfo->ipi_lock_grp = lck_grp_alloc_init("tcppcb", pcbinfo->ipi_lock_grp_attr);
+
+ /*
+ * allocate the lock attribute for tcp pcb mutexes
+ */
+ pcbinfo->ipi_lock_attr = lck_attr_alloc_init();
+
+ if ((pcbinfo->ipi_lock = lck_rw_alloc_init(pcbinfo->ipi_lock_grp,
+ pcbinfo->ipi_lock_attr)) == NULL) {
+ panic("%s: unable to allocate PCB lock\n", __func__);
+ /* NOTREACHED */
+ }
+
+ if (tcp_tcbhashsize == 0) {
+ /* Set to default */
+ tcp_tcbhashsize = 512;
+ }
+
+ if (!powerof2(tcp_tcbhashsize)) {
+ int old_hash_size = tcp_tcbhashsize;
+ tcp_tcbhashsize = scale_to_powerof2(tcp_tcbhashsize);
+ /* Lower limit of 16 */
+ if (tcp_tcbhashsize < 16) {
+ tcp_tcbhashsize = 16;
+ }
+ printf("WARNING: TCB hash size not a power of 2, "
+ "scaled from %d to %d.\n",
+ old_hash_size,
+ tcp_tcbhashsize);
+ }
+
+ tcbinfo.ipi_hashbase = hashinit(tcp_tcbhashsize, M_PCB, &tcbinfo.ipi_hashmask);
+ tcbinfo.ipi_porthashbase = hashinit(tcp_tcbhashsize, M_PCB,
+ &tcbinfo.ipi_porthashmask);
+ str_size = P2ROUNDUP(sizeof(struct inp_tp), sizeof(u_int64_t));
+ tcbinfo.ipi_zone = zinit(str_size, 120000*str_size, 8192, "tcpcb");
+ zone_change(tcbinfo.ipi_zone, Z_CALLERACCT, FALSE);
+ zone_change(tcbinfo.ipi_zone, Z_EXPAND, TRUE);
+
+ tcbinfo.ipi_gc = tcp_gc;
+ tcbinfo.ipi_timer = tcp_itimer;
+ in_pcbinfo_attach(&tcbinfo);
+
+ str_size = P2ROUNDUP(sizeof(struct sackhole), sizeof(u_int64_t));
+ sack_hole_zone = zinit(str_size, 120000*str_size, 8192, "sack_hole zone");
+ zone_change(sack_hole_zone, Z_CALLERACCT, FALSE);
+ zone_change(sack_hole_zone, Z_EXPAND, TRUE);
+
+ str_size = P2ROUNDUP(sizeof(struct tseg_qent), sizeof(u_int64_t));
+ tcp_reass_zone = zinit(str_size, (nmbclusters >> 4) * str_size,
+ 0, "tcp_reass_zone");
+ if (tcp_reass_zone == NULL) {
+ panic("%s: failed allocating tcp_reass_zone", __func__);
+ /* NOTREACHED */
+ }
+ zone_change(tcp_reass_zone, Z_CALLERACCT, FALSE);
+ zone_change(tcp_reass_zone, Z_EXPAND, TRUE);
+
+ bwmeas_elm_size = P2ROUNDUP(sizeof(struct bwmeas), sizeof(u_int64_t));
+ tcp_bwmeas_zone = zinit(bwmeas_elm_size, (100 * bwmeas_elm_size), 0, "tcp_bwmeas_zone");
+ if (tcp_bwmeas_zone == NULL) {
+ panic("%s: failed allocating tcp_bwmeas_zone", __func__);
+ /* NOTREACHED */
+ }
+ zone_change(tcp_bwmeas_zone, Z_CALLERACCT, FALSE);
+ zone_change(tcp_bwmeas_zone, Z_EXPAND, TRUE);
+
+ str_size = P2ROUNDUP(sizeof(struct tcp_ccstate), sizeof(u_int64_t));
+ tcp_cc_zone = zinit(str_size, 20000 * str_size, 0, "tcp_cc_zone");
+ zone_change(tcp_cc_zone, Z_CALLERACCT, FALSE);
+ zone_change(tcp_cc_zone, Z_EXPAND, TRUE);
+
+ str_size = P2ROUNDUP(sizeof(struct tcp_rxt_seg), sizeof(u_int64_t));
+ tcp_rxt_seg_zone = zinit(str_size, 10000 * str_size, 0,
+ "tcp_rxt_seg_zone");
+ zone_change(tcp_rxt_seg_zone, Z_CALLERACCT, FALSE);
+ zone_change(tcp_rxt_seg_zone, Z_EXPAND, TRUE);
+
#if INET6
#define TCP_MINPROTOHDR (sizeof(struct ip6_hdr) + sizeof(struct tcphdr))
#else /* INET6 */
#define TCP_MINPROTOHDR (sizeof(struct tcpiphdr))
#endif /* INET6 */
- if (max_protohdr < TCP_MINPROTOHDR)
- max_protohdr = TCP_MINPROTOHDR;
- if (max_linkhdr + TCP_MINPROTOHDR > MHLEN)
+ if (max_protohdr < TCP_MINPROTOHDR) {
+ _max_protohdr = TCP_MINPROTOHDR;
+ _max_protohdr = max_protohdr; /* round it up */
+ }
+ if (max_linkhdr + max_protohdr > MCLBYTES)
panic("tcp_init");
#undef TCP_MINPROTOHDR
- tcbinfo.last_pcb = 0;
- dummy_tcb.t_state = TCP_NSTATES;
- dummy_tcb.t_flags = 0;
- tcbinfo.dummy_cb = (caddr_t) &dummy_tcb;
- in_pcb_nat_init(&tcbinfo, AF_INET, IPPROTO_TCP, SOCK_STREAM);
- delack_bitmask = _MALLOC((4 * hashsize)/32, M_PCB, M_WAITOK);
- if (delack_bitmask == 0)
- panic("Delack Memory");
+ /* Initialize time wait and timer lists */
+ TAILQ_INIT(&tcp_tw_tailq);
+
+ bzero(&tcp_timer_list, sizeof(tcp_timer_list));
+ LIST_INIT(&tcp_timer_list.lhead);
+ /*
+ * allocate lock group attribute, group and attribute for the tcp timer list
+ */
+ tcp_timer_list.mtx_grp_attr = lck_grp_attr_alloc_init();
+ tcp_timer_list.mtx_grp = lck_grp_alloc_init("tcptimerlist", tcp_timer_list.mtx_grp_attr);
+ tcp_timer_list.mtx_attr = lck_attr_alloc_init();
+ if ((tcp_timer_list.mtx = lck_mtx_alloc_init(tcp_timer_list.mtx_grp, tcp_timer_list.mtx_attr)) == NULL) {
+ panic("failed to allocate memory for tcp_timer_list.mtx\n");
+ };
+ if ((tcp_timer_list.call = thread_call_allocate(tcp_run_timerlist, NULL)) == NULL) {
+ panic("failed to allocate call entry 1 in tcp_init\n");
+ }
+
+ /*
+ * allocate lock group attribute, group and attribute for tcp_uptime_lock
+ */
+ tcp_uptime_mtx_grp_attr = lck_grp_attr_alloc_init();
+ tcp_uptime_mtx_grp = lck_grp_alloc_init("tcpuptime", tcp_uptime_mtx_grp_attr);
+ tcp_uptime_mtx_attr = lck_attr_alloc_init();
+ tcp_uptime_lock = lck_spin_alloc_init(tcp_uptime_mtx_grp, tcp_uptime_mtx_attr);
+
+ /* Initialize TCP LRO data structures */
+ tcp_lro_init();
- for (i=0; i < (tcbinfo.hashsize / 32); i++)
- delack_bitmask[i] = 0;
+ /* Initialize TCP Cache */
+ tcp_cache_init();
- for (i=0; i < N_TIME_WAIT_SLOTS; i++) {
- LIST_INIT(&time_wait_slots[i]);
+ /*
+ * If more than 60 MB of mbuf pool is available, increase the
+ * maximum allowed receive and send socket buffer size.
+ */
+ if (nmbclusters > 30720) {
+ tcp_autorcvbuf_max = 1024 * 1024;
+ tcp_autosndbuf_max = 1024 * 1024;
}
}
ip6 = (struct ip6_hdr *)ip_ptr;
ip6->ip6_flow = (ip6->ip6_flow & ~IPV6_FLOWINFO_MASK) |
- (inp->in6p_flowinfo & IPV6_FLOWINFO_MASK);
+ (inp->inp_flow & IPV6_FLOWINFO_MASK);
ip6->ip6_vfc = (ip6->ip6_vfc & ~IPV6_VERSION_MASK) |
(IPV6_VERSION & IPV6_VERSION_MASK);
ip6->ip6_nxt = IPPROTO_TCP;
ip6->ip6_plen = sizeof(struct tcphdr);
ip6->ip6_src = inp->in6p_laddr;
ip6->ip6_dst = inp->in6p_faddr;
- tcp_hdr->th_sum = 0;
+ tcp_hdr->th_sum = in6_pseudo(&inp->in6p_laddr, &inp->in6p_faddr,
+ htonl(sizeof (struct tcphdr) + IPPROTO_TCP));
} else
#endif
{
* NOTE: If m != NULL, then ti must point to *inside* the mbuf.
*/
void
-tcp_respond(tp, ipgen, th, m, ack, seq, flags)
- struct tcpcb *tp;
- void *ipgen;
- register struct tcphdr *th;
- register struct mbuf *m;
- tcp_seq ack, seq;
- int flags;
+tcp_respond(struct tcpcb *tp, void *ipgen, struct tcphdr *th, struct mbuf *m,
+ tcp_seq ack, tcp_seq seq, int flags, struct tcp_respond_args *tra)
{
- register int tlen;
+ int tlen;
int win = 0;
struct route *ro = 0;
struct route sro;
struct ip6_hdr *ip6;
int isipv6;
#endif /* INET6 */
- int ipflags = 0;
+ struct ifnet *outif;
#if INET6
isipv6 = IP_VHL_V(((struct ip *)ipgen)->ip_vhl) == 6;
if (tp) {
if (!(flags & TH_RST)) {
- win = sbspace(&tp->t_inpcb->inp_socket->so_rcv);
- if (win > (long)TCP_MAXWIN << tp->rcv_scale)
- win = (long)TCP_MAXWIN << tp->rcv_scale;
+ win = tcp_sbspace(tp);
+ if (win > (int32_t)TCP_MAXWIN << tp->rcv_scale)
+ win = (int32_t)TCP_MAXWIN << tp->rcv_scale;
}
#if INET6
if (isipv6)
}
}
if (m == 0) {
- m = m_gethdr(M_DONTWAIT, MT_HEADER);
+ m = m_gethdr(M_DONTWAIT, MT_HEADER); /* MAC-OK */
if (m == NULL)
return;
tlen = 0;
m->m_data += max_linkhdr;
#if INET6
if (isipv6) {
+ VERIFY((MHLEN - max_linkhdr) >=
+ (sizeof (*ip6) + sizeof (*nth)));
bcopy((caddr_t)ip6, mtod(m, caddr_t),
sizeof(struct ip6_hdr));
ip6 = mtod(m, struct ip6_hdr *);
- nth = (struct tcphdr *)(ip6 + 1);
+ nth = (struct tcphdr *)(void *)(ip6 + 1);
} else
#endif /* INET6 */
{
+ VERIFY((MHLEN - max_linkhdr) >=
+ (sizeof (*ip) + sizeof (*nth)));
bcopy((caddr_t)ip, mtod(m, caddr_t), sizeof(struct ip));
ip = mtod(m, struct ip *);
- nth = (struct tcphdr *)(ip + 1);
+ nth = (struct tcphdr *)(void *)(ip + 1);
}
bcopy((caddr_t)th, (caddr_t)nth, sizeof(struct tcphdr));
+#if MPTCP
+ if ((tp) && (tp->t_mpflags & TMPF_RESET))
+ flags = (TH_RST | TH_ACK);
+ else
+#endif
flags = TH_ACK;
} else {
m_freem(m->m_next);
#define xchg(a,b,type) { type t; t=a; a=b; b=t; }
#if INET6
if (isipv6) {
+ /* Expect 32-bit aligned IP on strict-align platforms */
+ IP6_HDR_STRICT_ALIGNMENT_CHECK(ip6);
xchg(ip6->ip6_dst, ip6->ip6_src, struct in6_addr);
- nth = (struct tcphdr *)(ip6 + 1);
+ nth = (struct tcphdr *)(void *)(ip6 + 1);
} else
#endif /* INET6 */
{
+ /* Expect 32-bit aligned IP on strict-align platforms */
+ IP_HDR_STRICT_ALIGNMENT_CHECK(ip);
xchg(ip->ip_dst.s_addr, ip->ip_src.s_addr, n_long);
- nth = (struct tcphdr *)(ip + 1);
+ nth = (struct tcphdr *)(void *)(ip + 1);
}
if (th != nth) {
/*
}
m->m_len = tlen;
m->m_pkthdr.len = tlen;
- m->m_pkthdr.rcvif = (struct ifnet *) 0;
+ m->m_pkthdr.rcvif = 0;
+#if CONFIG_MACF_NET
+ if (tp != NULL && tp->t_inpcb != NULL) {
+ /*
+ * Packet is associated with a socket, so allow the
+ * label of the response to reflect the socket label.
+ */
+ mac_mbuf_label_associate_inpcb(tp->t_inpcb, m);
+ } else {
+ /*
+ * Packet is not associated with a socket, so possibly
+ * update the label in place.
+ */
+ mac_netinet_tcp_reply(m);
+ }
+#endif
+
nth->th_seq = htonl(seq);
nth->th_ack = htonl(ack);
nth->th_x2 = 0;
#if INET6
if (isipv6) {
nth->th_sum = 0;
- nth->th_sum = in6_cksum(m, IPPROTO_TCP,
- sizeof(struct ip6_hdr),
- tlen - sizeof(struct ip6_hdr));
+ nth->th_sum = in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst,
+ htonl((tlen - sizeof (struct ip6_hdr)) + IPPROTO_TCP));
+ m->m_pkthdr.csum_flags = CSUM_TCPIPV6;
+ m->m_pkthdr.csum_data = offsetof(struct tcphdr, th_sum);
ip6->ip6_hlim = in6_selecthlim(tp ? tp->t_inpcb : NULL,
ro6 && ro6->ro_rt ?
ro6->ro_rt->rt_ifp :
if (tp == NULL || (tp->t_inpcb->inp_socket->so_options & SO_DEBUG))
tcp_trace(TA_OUTPUT, 0, tp, mtod(m, void *), th, 0);
#endif
+
+#if NECP
+ necp_mark_packet_from_socket(m, tp ? tp->t_inpcb : NULL, 0, 0);
+#endif /* NECP */
+
#if IPSEC
- if (ipsec_bypass == 0 && ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL) != 0) {
+ if (tp != NULL && tp->t_inpcb->inp_sp != NULL &&
+ ipsec_setsocket(m, tp ? tp->t_inpcb->inp_socket : NULL) != 0) {
m_freem(m);
return;
}
#endif
+
+ if (tp != NULL) {
+ u_int32_t svc_flags = 0;
+ if (isipv6) {
+ svc_flags |= PKT_SCF_IPV6;
+ }
+ set_packet_service_class(m, tp->t_inpcb->inp_socket,
+ MBUF_SC_UNSPEC, svc_flags);
+
+ /* Embed flowhash and flow control flags */
+ m->m_pkthdr.pkt_flowsrc = FLOWSRC_INPCB;
+ m->m_pkthdr.pkt_flowid = tp->t_inpcb->inp_flowhash;
+ m->m_pkthdr.pkt_flags |= PKTF_FLOW_ID | PKTF_FLOW_LOCALSRC;
+#if MPTCP
+ /* Disable flow advisory when using MPTCP. */
+ if (!(tp->t_mpflags & TMPF_MPTCP_TRUE))
+#endif /* MPTCP */
+ m->m_pkthdr.pkt_flags |= PKTF_FLOW_ADV;
+ m->m_pkthdr.pkt_proto = IPPROTO_TCP;
+ }
+
#if INET6
if (isipv6) {
- (void)ip6_output(m, NULL, ro6, ipflags, NULL, NULL);
- if (ro6 == &sro6 && ro6->ro_rt) {
- rtfree(ro6->ro_rt);
- ro6->ro_rt = NULL;
- }
+ struct ip6_out_args ip6oa = { tra->ifscope, { 0 },
+ IP6OAF_SELECT_SRCIF | IP6OAF_BOUND_SRCADDR, 0 };
+
+ if (tra->ifscope != IFSCOPE_NONE)
+ ip6oa.ip6oa_flags |= IP6OAF_BOUND_IF;
+ if (tra->nocell)
+ ip6oa.ip6oa_flags |= IP6OAF_NO_CELLULAR;
+ if (tra->noexpensive)
+ ip6oa.ip6oa_flags |= IP6OAF_NO_EXPENSIVE;
+ if (tra->awdl_unrestricted)
+ ip6oa.ip6oa_flags |= IP6OAF_AWDL_UNRESTRICTED;
+
+ (void) ip6_output(m, NULL, ro6, IPV6_OUTARGS, NULL,
+ NULL, &ip6oa);
+
+ if (tp != NULL && ro6 != NULL && ro6->ro_rt != NULL &&
+ (outif = ro6->ro_rt->rt_ifp) !=
+ tp->t_inpcb->in6p_last_outifp)
+ tp->t_inpcb->in6p_last_outifp = outif;
+
+ if (ro6 == &sro6)
+ ROUTE_RELEASE(ro6);
} else
#endif /* INET6 */
{
- (void) ip_output(m, NULL, ro, ipflags, NULL);
- if (ro == &sro && ro->ro_rt) {
- rtfree(ro->ro_rt);
- ro->ro_rt = NULL;
+ struct ip_out_args ipoa = { tra->ifscope, { 0 },
+ IPOAF_SELECT_SRCIF | IPOAF_BOUND_SRCADDR, 0 };
+
+ if (tra->ifscope != IFSCOPE_NONE)
+ ipoa.ipoa_flags |= IPOAF_BOUND_IF;
+ if (tra->nocell)
+ ipoa.ipoa_flags |= IPOAF_NO_CELLULAR;
+ if (tra->noexpensive)
+ ipoa.ipoa_flags |= IPOAF_NO_EXPENSIVE;
+ if (tra->awdl_unrestricted)
+ ipoa.ipoa_flags |= IPOAF_AWDL_UNRESTRICTED;
+
+ if (ro != &sro) {
+ /* Copy the cached route and take an extra reference */
+ inp_route_copyout(tp->t_inpcb, &sro);
+ }
+ /*
+ * For consistency, pass a local route copy.
+ */
+ (void) ip_output(m, NULL, &sro, IP_OUTARGS, NULL, &ipoa);
+
+ if (tp != NULL && sro.ro_rt != NULL &&
+ (outif = sro.ro_rt->rt_ifp) !=
+ tp->t_inpcb->inp_last_outifp)
+ tp->t_inpcb->inp_last_outifp = outif;
+
+ if (ro != &sro) {
+ /* Synchronize cached PCB route */
+ inp_route_copyin(tp->t_inpcb, &sro);
+ } else {
+ ROUTE_RELEASE(&sro);
}
}
}
int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
#endif /* INET6 */
- if (so->cached_in_sock_layer == 0) {
- it = (struct inp_tp *)inp;
+ calculate_tcp_clock();
+
+ if ((so->so_flags1 & SOF1_CACHED_IN_SOCK_LAYER) == 0) {
+ it = (struct inp_tp *)(void *)inp;
tp = &it->tcb;
+ } else {
+ tp = (struct tcpcb *)(void *)inp->inp_saved_ppcb;
}
- else
- tp = (struct tcpcb *) inp->inp_saved_ppcb;
-
+
bzero((char *) tp, sizeof(struct tcpcb));
LIST_INIT(&tp->t_segq);
tp->t_maxseg = tp->t_maxopd =
#endif /* INET6 */
tcp_mssdflt;
-#ifndef __APPLE__
- /* Set up our timeouts. */
- callout_init(tp->tt_rexmt = &it->inp_tp_rexmt);
- callout_init(tp->tt_persist = &it->inp_tp_persist);
- callout_init(tp->tt_keep = &it->inp_tp_keep);
- callout_init(tp->tt_2msl = &it->inp_tp_2msl);
- callout_init(tp->tt_delack = &it->inp_tp_delack);
-#endif
-
if (tcp_do_rfc1323)
tp->t_flags = (TF_REQ_SCALE|TF_REQ_TSTMP);
- if (tcp_do_rfc1644)
- tp->t_flags |= TF_REQ_CC;
+ if (tcp_do_sack)
+ tp->t_flagsext |= TF_SACK_ENABLE;
+
+ TAILQ_INIT(&tp->snd_holes);
+ SLIST_INIT(&tp->t_rxt_segments);
tp->t_inpcb = inp; /* XXX */
/*
* Init srtt to TCPTV_SRTTBASE (0), so we can tell that we have no
*/
tp->t_srtt = TCPTV_SRTTBASE;
tp->t_rttvar = ((TCPTV_RTOBASE - TCPTV_SRTTBASE) << TCP_RTTVAR_SHIFT) / 4;
- tp->t_rttmin = TCPTV_MIN;
+ tp->t_rttmin = tcp_TCPTV_MIN;
tp->t_rxtcur = TCPTV_RTOBASE;
- tp->snd_cwnd = TCP_MAXWIN << TCP_MAX_WINSHIFT;
+
+ if (tcp_use_newreno)
+ /* use newreno by default */
+ tp->tcp_cc_index = TCP_CC_ALGO_NEWRENO_INDEX;
+ else
+ tp->tcp_cc_index = TCP_CC_ALGO_CUBIC_INDEX;
+
+ tcp_cc_allocate_state(tp);
+
+ if (CC_ALGO(tp)->init != NULL)
+ CC_ALGO(tp)->init(tp);
+
+ tp->snd_cwnd = TCP_CC_CWND_INIT_BYTES;
tp->snd_ssthresh = TCP_MAXWIN << TCP_MAX_WINSHIFT;
- /*
+ tp->snd_ssthresh_prev = TCP_MAXWIN << TCP_MAX_WINSHIFT;
+ tp->t_rcvtime = tcp_now;
+ tp->tentry.timer_start = tcp_now;
+ tp->t_persist_timeout = tcp_max_persist_timeout;
+ tp->t_persist_stop = 0;
+ tp->t_flagsext |= TF_RCVUNACK_WAITSS;
+ tp->t_rexmtthresh = tcprexmtthresh;
+
+ /* Clear time wait tailq entry */
+ tp->t_twentry.tqe_next = NULL;
+ tp->t_twentry.tqe_prev = NULL;
+
+ /*
* IPv4 TTL initialization is necessary for an IPv6 socket as well,
* because the socket may be bound to an IPv6 wildcard address,
* which may match an IPv4-mapped IPv6 address.
int errno;
{
struct socket *so = tp->t_inpcb->inp_socket;
-
-#ifdef __APPLE__
- switch (tp->t_state)
- {
- case TCPS_ESTABLISHED:
- case TCPS_FIN_WAIT_1:
- case TCPS_CLOSING:
- case TCPS_CLOSE_WAIT:
- case TCPS_LAST_ACK:
- break;
- }
+#if CONFIG_DTRACE
+ struct inpcb *inp = tp->t_inpcb;
#endif
-
+
if (TCPS_HAVERCVDSYN(tp->t_state)) {
+ DTRACE_TCP4(state__change, void, NULL, struct inpcb *, inp,
+ struct tcpcb *, tp, int32_t, TCPS_CLOSED);
tp->t_state = TCPS_CLOSED;
(void) tcp_output(tp);
tcpstat.tcps_drops++;
return (tcp_close(tp));
}
+void
+tcp_getrt_rtt(struct tcpcb *tp, struct rtentry *rt)
+{
+ u_int32_t rtt = rt->rt_rmx.rmx_rtt;
+ int isnetlocal = (tp->t_flags & TF_LOCAL);
+
+ if (rtt != 0) {
+ /*
+ * XXX the lock bit for RTT indicates that the value
+ * is also a minimum value; this is subject to time.
+ */
+ if (rt->rt_rmx.rmx_locks & RTV_RTT)
+ tp->t_rttmin = rtt / (RTM_RTTUNIT / TCP_RETRANSHZ);
+ else
+ tp->t_rttmin = isnetlocal ? tcp_TCPTV_MIN : TCPTV_REXMTMIN;
+ tp->t_srtt = rtt / (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTT_SCALE));
+ tcpstat.tcps_usedrtt++;
+ if (rt->rt_rmx.rmx_rttvar) {
+ tp->t_rttvar = rt->rt_rmx.rmx_rttvar /
+ (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTTVAR_SCALE));
+ tcpstat.tcps_usedrttvar++;
+ } else {
+ /* default variation is +- 1 rtt */
+ tp->t_rttvar =
+ tp->t_srtt * TCP_RTTVAR_SCALE / TCP_RTT_SCALE;
+ }
+ TCPT_RANGESET(tp->t_rxtcur,
+ ((tp->t_srtt >> 2) + tp->t_rttvar) >> 1,
+ tp->t_rttmin, TCPTV_REXMTMAX,
+ TCP_ADD_REXMTSLOP(tp));
+ }
+}
+
+static inline void
+tcp_update_ecn_perf_stats(struct tcpcb *tp,
+ struct if_tcp_ecn_perf_stat *stat)
+{
+ u_int64_t curval, oldval;
+ struct inpcb *inp = tp->t_inpcb;
+ stat->total_txpkts += inp->inp_stat->txpackets;
+ stat->total_rxpkts += inp->inp_stat->rxpackets;
+ stat->total_rxmitpkts += tp->t_stat.rxmitpkts;
+ stat->total_oopkts += tp->t_rcvoopack;
+ stat->total_reorderpkts += (tp->t_reordered_pkts + tp->t_pawsdrop +
+ tp->t_dsack_sent + tp->t_dsack_recvd);
+
+ /* Average RTT */
+ curval = (tp->t_srtt >> TCP_RTT_SHIFT);
+ if (curval > 0 && tp->t_rttupdated >= 16) {
+ if (stat->rtt_avg == 0) {
+ stat->rtt_avg = curval;
+ } else {
+ oldval = stat->rtt_avg;
+ stat->rtt_avg =
+ ((oldval << 4) - oldval + curval) >> 4;
+ }
+ }
+
+ /* RTT variance */
+ curval = tp->t_rttvar >> TCP_RTTVAR_SHIFT;
+ if (curval > 0 && tp->t_rttupdated >= 16) {
+ if (stat->rtt_var == 0) {
+ stat->rtt_var = curval;
+ } else {
+ oldval = stat->rtt_var;
+ stat->rtt_var =
+ ((oldval << 4) - oldval + curval) >> 4;
+ }
+ }
+
+ /* Total number of SACK recovery episodes */
+ stat->sack_episodes += tp->t_sack_recovery_episode;
+
+ if (inp->inp_socket->so_error == ECONNRESET)
+ stat->rst_drop++;
+ return;
+}
+
/*
* Close a TCP control block:
* discard all space held by the tcp
tcp_close(tp)
register struct tcpcb *tp;
{
- register struct tseg_qent *q;
struct inpcb *inp = tp->t_inpcb;
struct socket *so = inp->inp_socket;
#if INET6
int isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
#endif /* INET6 */
- register struct rtentry *rt;
+ struct route *ro;
+ struct rtentry *rt;
int dosavessthresh;
- if ( inp->inp_ppcb == NULL) /* tcp_close was called previously, bail */
- return;
+ /* tcp_close was called previously, bail */
+ if (inp->inp_ppcb == NULL)
+ return(NULL);
+
+ tcp_canceltimers(tp);
+ KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_START, tp,0,0,0,0);
-#ifndef __APPLE__
/*
- * Make sure that all of our timers are stopped before we
- * delete the PCB.
+ * If another thread for this tcp is currently in ip (indicated by
+ * the TF_SENDINPROG flag), defer the cleanup until after it returns
+ * back to tcp. This is done to serialize the close until after all
+ * pending output is finished, in order to avoid having the PCB be
+ * detached and the cached route cleaned, only for ip to cache the
+ * route back into the PCB again. Note that we've cleared all the
+ * timers at this point. Set TF_CLOSING to indicate to tcp_output()
+ * that is should call us again once it returns from ip; at that
+ * point both flags should be cleared and we can proceed further
+ * with the cleanup.
*/
- callout_stop(tp->tt_rexmt);
- callout_stop(tp->tt_persist);
- callout_stop(tp->tt_keep);
- callout_stop(tp->tt_2msl);
- callout_stop(tp->tt_delack);
-#else
- /* Clear the timers before we delete the PCB. */
- {
- int i;
- for (i = 0; i < TCPT_NTIMERS; i++) {
- tp->t_timer[i] = 0;
- }
+ if ((tp->t_flags & TF_CLOSING) ||
+ inp->inp_sndinprog_cnt > 0) {
+ tp->t_flags |= TF_CLOSING;
+ return (NULL);
}
-#endif
-
- KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_START, tp,0,0,0,0);
- switch (tp->t_state)
- {
- case TCPS_ESTABLISHED:
- case TCPS_FIN_WAIT_1:
- case TCPS_CLOSING:
- case TCPS_CLOSE_WAIT:
- case TCPS_LAST_ACK:
- break;
- }
+ DTRACE_TCP4(state__change, void, NULL, struct inpcb *, inp,
+ struct tcpcb *, tp, int32_t, TCPS_CLOSED);
+#if INET6
+ ro = (isipv6 ? (struct route *)&inp->in6p_route : &inp->inp_route);
+#else
+ ro = &inp->inp_route;
+#endif
+ rt = ro->ro_rt;
+ if (rt != NULL)
+ RT_LOCK_SPIN(rt);
/*
* If we got enough samples through the srtt filter,
* update anything that the user "locked".
*/
if (tp->t_rttupdated >= 16) {
- register u_long i = 0;
+ register u_int32_t i = 0;
+
#if INET6
if (isipv6) {
struct sockaddr_in6 *sin6;
- if ((rt = inp->in6p_route.ro_rt) == NULL)
+ if (rt == NULL)
goto no_valid_rt;
- sin6 = (struct sockaddr_in6 *)rt_key(rt);
+ sin6 = (struct sockaddr_in6 *)(void *)rt_key(rt);
if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr))
goto no_valid_rt;
}
else
#endif /* INET6 */
- rt = inp->inp_route.ro_rt;
- if (rt == NULL ||
- ((struct sockaddr_in *)rt_key(rt))->sin_addr.s_addr
- == INADDR_ANY || rt->generation_id != route_generation) {
- if (tp->t_state >= TCPS_CLOSE_WAIT)
- tp->t_state = TCPS_CLOSING;
-
+ if (ROUTE_UNUSABLE(ro) ||
+ SIN(rt_key(rt))->sin_addr.s_addr == INADDR_ANY) {
+ DTRACE_TCP4(state__change, void, NULL,
+ struct inpcb *, inp, struct tcpcb *, tp,
+ int32_t, TCPS_CLOSED);
+ tp->t_state = TCPS_CLOSED;
goto no_valid_rt;
}
+ RT_LOCK_ASSERT_HELD(rt);
if ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0) {
i = tp->t_srtt *
- (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTT_SCALE));
+ (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTT_SCALE));
if (rt->rt_rmx.rmx_rtt && i)
/*
* filter this update to half the old & half
}
if ((rt->rt_rmx.rmx_locks & RTV_RTTVAR) == 0) {
i = tp->t_rttvar *
- (RTM_RTTUNIT / (PR_SLOWHZ * TCP_RTTVAR_SCALE));
+ (RTM_RTTUNIT / (TCP_RETRANSHZ * TCP_RTTVAR_SCALE));
if (rt->rt_rmx.rmx_rttvar && i)
rt->rt_rmx.rmx_rttvar =
(rt->rt_rmx.rmx_rttvar + i) / 2;
i = (i + tp->t_maxseg / 2) / tp->t_maxseg;
if (i < 2)
i = 2;
- i *= (u_long)(tp->t_maxseg +
+ i *= (u_int32_t)(tp->t_maxseg +
#if INET6
(isipv6 ? sizeof (struct ip6_hdr) +
sizeof (struct tcphdr) :
tcpstat.tcps_cachedssthresh++;
}
}
- rt = inp->inp_route.ro_rt;
- if (rt) {
- /*
- * mark route for deletion if no information is
- * cached.
- */
- if ((tp->t_flags & TF_LQ_OVERFLOW) &&
- ((rt->rt_rmx.rmx_locks & RTV_RTT) == 0)){
- if (rt->rt_rmx.rmx_rtt == 0)
- rt->rt_flags |= RTF_DELCLONE;
+
+ /*
+ * Mark route for deletion if no information is cached.
+ */
+ if (rt != NULL && (so->so_flags & SOF_OVERFLOW) && tcp_lq_overflow) {
+ if (!(rt->rt_rmx.rmx_locks & RTV_RTT) &&
+ rt->rt_rmx.rmx_rtt == 0) {
+ rt->rt_flags |= RTF_DELCLONE;
}
}
- no_valid_rt:
+
+no_valid_rt:
+ if (rt != NULL)
+ RT_UNLOCK(rt);
+
/* free the reassembly queue, if any */
(void) tcp_freeq(tp);
-#ifdef __APPLE__
- if (so->cached_in_sock_layer)
- inp->inp_saved_ppcb = (caddr_t) tp;
-#endif
+ /* Collect ECN related statistics */
+ if (tp->ecn_flags & TE_SETUPSENT) {
+ if (tp->ecn_flags & TE_CLIENT_SETUP) {
+ INP_INC_IFNET_STAT(inp, ecn_client_setup);
+ if (TCP_ECN_ENABLED(tp)) {
+ INP_INC_IFNET_STAT(inp,
+ ecn_client_success);
+ } else if (tp->ecn_flags & TE_LOST_SYN) {
+ INP_INC_IFNET_STAT(inp, ecn_syn_lost);
+ } else {
+ INP_INC_IFNET_STAT(inp,
+ ecn_peer_nosupport);
+ }
+ } else {
+ INP_INC_IFNET_STAT(inp, ecn_server_setup);
+ if (TCP_ECN_ENABLED(tp)) {
+ INP_INC_IFNET_STAT(inp,
+ ecn_server_success);
+ } else if (tp->ecn_flags & TE_LOST_SYNACK) {
+ INP_INC_IFNET_STAT(inp,
+ ecn_synack_lost);
+ } else {
+ INP_INC_IFNET_STAT(inp,
+ ecn_peer_nosupport);
+ }
+ }
+ } else {
+ INP_INC_IFNET_STAT(inp, ecn_off_conn);
+ }
+ if (TCP_ECN_ENABLED(tp)) {
+ if (tp->ecn_flags & TE_RECV_ECN_CE) {
+ tcpstat.tcps_ecn_conn_recv_ce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_recv_ce);
+ }
+ if (tp->ecn_flags & TE_RECV_ECN_ECE) {
+ tcpstat.tcps_ecn_conn_recv_ece++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_recv_ece);
+ }
+ if (tp->ecn_flags & (TE_RECV_ECN_CE | TE_RECV_ECN_ECE)) {
+ if (tp->t_stat.txretransmitbytes > 0 ||
+ tp->t_stat.rxoutoforderbytes > 0) {
+ tcpstat.tcps_ecn_conn_pl_ce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_plce);
+ } else {
+ tcpstat.tcps_ecn_conn_nopl_ce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_noplce);
+ }
+ } else {
+ if (tp->t_stat.txretransmitbytes > 0 ||
+ tp->t_stat.rxoutoforderbytes > 0) {
+ tcpstat.tcps_ecn_conn_plnoce++;
+ INP_INC_IFNET_STAT(inp, ecn_conn_plnoce);
+ }
+ }
+ }
- inp->inp_ppcb = NULL;
- soisdisconnected(so);
-#if INET6
- if (INP_CHECK_SOCKAF(so, AF_INET6))
- in6_pcbdetach(inp);
- else
-#endif /* INET6 */
- in_pcbdetach(inp);
- tcpstat.tcps_closed++;
- KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_END, tcpstat.tcps_closed,0,0,0,0);
- return ((struct tcpcb *)0);
-}
+ /* Aggregate performance stats */
+ if (inp->inp_last_outifp != NULL && !(tp->t_flags & TF_LOCAL)) {
+ struct ifnet *ifp = inp->inp_last_outifp;
+ ifnet_lock_shared(ifp);
+ if ((ifp->if_refflags & (IFRF_ATTACHED | IFRF_DETACHING)) ==
+ IFRF_ATTACHED) {
+ if (inp->inp_vflag & INP_IPV6) {
+ ifp->if_ipv6_stat->timestamp = net_uptime();
+ if (TCP_ECN_ENABLED(tp)) {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv6_stat->ecn_on);
+ } else {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv6_stat->ecn_off);
+ }
+ } else {
+ ifp->if_ipv4_stat->timestamp = net_uptime();
+ if (TCP_ECN_ENABLED(tp)) {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv4_stat->ecn_on);
+ } else {
+ tcp_update_ecn_perf_stats(tp,
+ &ifp->if_ipv4_stat->ecn_off);
+ }
+ }
+ }
+ ifnet_lock_done(ifp);
+ }
-int
-tcp_freeq(tp)
- struct tcpcb *tp;
-{
+ tcp_free_sackholes(tp);
+ if (tp->t_bwmeas != NULL) {
+ tcp_bwmeas_free(tp);
+ }
+ tcp_rxtseg_clean(tp);
+ /* Free the packet list */
+ if (tp->t_pktlist_head != NULL)
+ m_freem_list(tp->t_pktlist_head);
+ TCP_PKTLIST_CLEAR(tp);
+
+#if MPTCP
+ /* Clear MPTCP state */
+ if ((so->so_flags & SOF_MPTCP_TRUE) ||
+ (so->so_flags & SOF_MP_SUBFLOW)) {
+ soevent(so, (SO_FILT_HINT_LOCKED | SO_FILT_HINT_DELETEOK));
+ }
+ tp->t_mpflags = 0;
+ tp->t_mptcb = NULL;
+#endif /* MPTCP */
- register struct tseg_qent *q;
- int rv = 0;
+ if (so->so_flags1 & SOF1_CACHED_IN_SOCK_LAYER)
+ inp->inp_saved_ppcb = (caddr_t) tp;
- while((q = LIST_FIRST(&tp->t_segq)) != NULL) {
- LIST_REMOVE(q, tqe_q);
- m_freem(q->tqe_m);
- FREE(q, M_TSEGQ);
+ tp->t_state = TCPS_CLOSED;
+
+ /* Issue a wakeup before detach so that we don't miss
+ * a wakeup
+ */
+ sodisconnectwakeup(so);
+
+ /*
+ * Clean up any LRO state
+ */
+ if (tp->t_flagsext & TF_LRO_OFFLOADED) {
+ tcp_lro_remove_state(inp->inp_laddr, inp->inp_faddr,
+ inp->inp_lport, inp->inp_fport);
+ tp->t_flagsext &= ~TF_LRO_OFFLOADED;
+ }
+
+ /*
+ * If this is a socket that does not want to wakeup the device
+ * for it's traffic, the application might need to know that the
+ * socket is closed, send a notification.
+ */
+ if ((so->so_options & SO_NOWAKEFROMSLEEP) &&
+ inp->inp_state != INPCB_STATE_DEAD &&
+ !(inp->inp_flags2 & INP2_TIMEWAIT))
+ socket_post_kev_msg_closed(so);
+
+ if (CC_ALGO(tp)->cleanup != NULL) {
+ CC_ALGO(tp)->cleanup(tp);
+ }
+
+ if (tp->t_ccstate != NULL) {
+ zfree(tcp_cc_zone, tp->t_ccstate);
+ tp->t_ccstate = NULL;
+ }
+ tp->tcp_cc_index = TCP_CC_ALGO_NONE;
+
+ /* Can happen if we close the socket before receiving the third ACK */
+ if ((tp->t_tfo_flags & TFO_F_COOKIE_VALID)) {
+ OSDecrementAtomic(&tcp_tfo_halfcnt);
+
+ /* Panic if something has gone terribly wrong. */
+ VERIFY(tcp_tfo_halfcnt >= 0);
+
+ tp->t_tfo_flags &= ~TFO_F_COOKIE_VALID;
+ }
+
+#if INET6
+ if (SOCK_CHECK_DOM(so, PF_INET6))
+ in6_pcbdetach(inp);
+ else
+#endif /* INET6 */
+ in_pcbdetach(inp);
+
+ /* Call soisdisconnected after detach because it might unlock the socket */
+ soisdisconnected(so);
+ tcpstat.tcps_closed++;
+ KERNEL_DEBUG(DBG_FNC_TCP_CLOSE | DBG_FUNC_END,
+ tcpstat.tcps_closed, 0, 0, 0, 0);
+ return(NULL);
+}
+
+int
+tcp_freeq(tp)
+ struct tcpcb *tp;
+{
+
+ register struct tseg_qent *q;
+ int rv = 0;
+
+ while((q = LIST_FIRST(&tp->t_segq)) != NULL) {
+ LIST_REMOVE(q, tqe_q);
+ m_freem(q->tqe_m);
+ zfree(tcp_reass_zone, q);
rv = 1;
}
+ tp->t_reassqlen = 0;
return (rv);
}
+
+/*
+ * Walk the tcpbs, if existing, and flush the reassembly queue,
+ * if there is one when do_tcpdrain is enabled
+ * Also defunct the extended background idle socket
+ * Do it next time if the pcbinfo lock is in use
+ */
void
tcp_drain()
{
- if (do_tcpdrain)
- {
- struct inpcb *inpb;
- struct tcpcb *tcpb;
- struct tseg_qent *te;
+ struct inpcb *inp;
+ struct tcpcb *tp;
- /*
- * Walk the tcpbs, if existing, and flush the reassembly queue,
- * if there is one...
- * XXX: The "Net/3" implementation doesn't imply that the TCP
- * reassembly queue should be flushed, but in a situation
- * where we're really low on mbufs, this is potentially
- * usefull.
- */
- for (inpb = LIST_FIRST(tcbinfo.listhead); inpb;
- inpb = LIST_NEXT(inpb, inp_list)) {
- if ((tcpb = intotcpcb(inpb))) {
- while ((te = LIST_FIRST(&tcpb->t_segq))
- != NULL) {
- LIST_REMOVE(te, tqe_q);
- m_freem(te->tqe_m);
- FREE(te, M_TSEGQ);
- }
- }
- }
+ if (!lck_rw_try_lock_exclusive(tcbinfo.ipi_lock))
+ return;
+
+ LIST_FOREACH(inp, tcbinfo.ipi_listhead, inp_list) {
+ if (in_pcb_checkstate(inp, WNT_ACQUIRE, 0) !=
+ WNT_STOPUSING) {
+ tcp_lock(inp->inp_socket, 1, 0);
+ if (in_pcb_checkstate(inp, WNT_RELEASE, 1)
+ == WNT_STOPUSING) {
+ /* lost a race, try the next one */
+ tcp_unlock(inp->inp_socket, 1, 0);
+ continue;
+ }
+ tp = intotcpcb(inp);
+ if (do_tcpdrain)
+ tcp_freeq(tp);
+
+ so_drain_extended_bk_idle(inp->inp_socket);
+
+ tcp_unlock(inp->inp_socket, 1, 0);
+ }
}
+ lck_rw_done(tcbinfo.ipi_lock);
+
}
/*
{
struct tcpcb *tp;
- if (inp == NULL)
+ if (inp == NULL || (inp->inp_state == INPCB_STATE_DEAD))
return; /* pcb is gone already */
tp = (struct tcpcb *)inp->inp_ppcb;
#endif
}
+struct bwmeas*
+tcp_bwmeas_alloc(struct tcpcb *tp)
+{
+ struct bwmeas *elm;
+ elm = zalloc(tcp_bwmeas_zone);
+ if (elm == NULL)
+ return(elm);
+
+ bzero(elm, bwmeas_elm_size);
+ elm->bw_minsizepkts = TCP_BWMEAS_BURST_MINSIZE;
+ elm->bw_maxsizepkts = TCP_BWMEAS_BURST_MAXSIZE;
+ elm->bw_minsize = elm->bw_minsizepkts * tp->t_maxseg;
+ elm->bw_maxsize = elm->bw_maxsizepkts * tp->t_maxseg;
+ return(elm);
+}
+
+void
+tcp_bwmeas_free(struct tcpcb* tp)
+{
+ zfree(tcp_bwmeas_zone, tp->t_bwmeas);
+ tp->t_bwmeas = NULL;
+ tp->t_flagsext &= ~(TF_MEASURESNDBW);
+}
+
+/*
+ * tcpcb_to_otcpcb copies specific bits of a tcpcb to a otcpcb format.
+ * The otcpcb data structure is passed to user space and must not change.
+ */
+static void
+tcpcb_to_otcpcb(struct tcpcb *tp, struct otcpcb *otp)
+{
+ otp->t_segq = (uint32_t)VM_KERNEL_ADDRPERM(tp->t_segq.lh_first);
+ otp->t_dupacks = tp->t_dupacks;
+ otp->t_timer[TCPT_REXMT_EXT] = tp->t_timer[TCPT_REXMT];
+ otp->t_timer[TCPT_PERSIST_EXT] = tp->t_timer[TCPT_PERSIST];
+ otp->t_timer[TCPT_KEEP_EXT] = tp->t_timer[TCPT_KEEP];
+ otp->t_timer[TCPT_2MSL_EXT] = tp->t_timer[TCPT_2MSL];
+ otp->t_inpcb = (_TCPCB_PTR(struct inpcb *))VM_KERNEL_ADDRPERM(tp->t_inpcb);
+ otp->t_state = tp->t_state;
+ otp->t_flags = tp->t_flags;
+ otp->t_force = (tp->t_flagsext & TF_FORCE) ? 1 : 0;
+ otp->snd_una = tp->snd_una;
+ otp->snd_max = tp->snd_max;
+ otp->snd_nxt = tp->snd_nxt;
+ otp->snd_up = tp->snd_up;
+ otp->snd_wl1 = tp->snd_wl1;
+ otp->snd_wl2 = tp->snd_wl2;
+ otp->iss = tp->iss;
+ otp->irs = tp->irs;
+ otp->rcv_nxt = tp->rcv_nxt;
+ otp->rcv_adv = tp->rcv_adv;
+ otp->rcv_wnd = tp->rcv_wnd;
+ otp->rcv_up = tp->rcv_up;
+ otp->snd_wnd = tp->snd_wnd;
+ otp->snd_cwnd = tp->snd_cwnd;
+ otp->snd_ssthresh = tp->snd_ssthresh;
+ otp->t_maxopd = tp->t_maxopd;
+ otp->t_rcvtime = tp->t_rcvtime;
+ otp->t_starttime = tp->t_starttime;
+ otp->t_rtttime = tp->t_rtttime;
+ otp->t_rtseq = tp->t_rtseq;
+ otp->t_rxtcur = tp->t_rxtcur;
+ otp->t_maxseg = tp->t_maxseg;
+ otp->t_srtt = tp->t_srtt;
+ otp->t_rttvar = tp->t_rttvar;
+ otp->t_rxtshift = tp->t_rxtshift;
+ otp->t_rttmin = tp->t_rttmin;
+ otp->t_rttupdated = tp->t_rttupdated;
+ otp->max_sndwnd = tp->max_sndwnd;
+ otp->t_softerror = tp->t_softerror;
+ otp->t_oobflags = tp->t_oobflags;
+ otp->t_iobc = tp->t_iobc;
+ otp->snd_scale = tp->snd_scale;
+ otp->rcv_scale = tp->rcv_scale;
+ otp->request_r_scale = tp->request_r_scale;
+ otp->requested_s_scale = tp->requested_s_scale;
+ otp->ts_recent = tp->ts_recent;
+ otp->ts_recent_age = tp->ts_recent_age;
+ otp->last_ack_sent = tp->last_ack_sent;
+ otp->cc_send = 0;
+ otp->cc_recv = 0;
+ otp->snd_recover = tp->snd_recover;
+ otp->snd_cwnd_prev = tp->snd_cwnd_prev;
+ otp->snd_ssthresh_prev = tp->snd_ssthresh_prev;
+ otp->t_badrxtwin = 0;
+}
+
static int
tcp_pcblist SYSCTL_HANDLER_ARGS
{
- int error, i, n, s;
+#pragma unused(oidp, arg1, arg2)
+ int error, i = 0, n;
struct inpcb *inp, **inp_list;
+ struct tcpcb *tp;
inp_gen_t gencnt;
struct xinpgen xig;
* The process of preparing the TCB list is too time-consuming and
* resource-intensive to repeat twice on every request.
*/
- if (req->oldptr == 0) {
+ lck_rw_lock_shared(tcbinfo.ipi_lock);
+ if (req->oldptr == USER_ADDR_NULL) {
n = tcbinfo.ipi_count;
req->oldidx = 2 * (sizeof xig)
+ (n + n/8) * sizeof(struct xtcpcb);
+ lck_rw_done(tcbinfo.ipi_lock);
return 0;
}
- if (req->newptr != 0)
+ if (req->newptr != USER_ADDR_NULL) {
+ lck_rw_done(tcbinfo.ipi_lock);
return EPERM;
+ }
/*
* OK, now we're committed to doing something.
*/
- s = splnet();
gencnt = tcbinfo.ipi_gencnt;
n = tcbinfo.ipi_count;
- splx(s);
+ bzero(&xig, sizeof(xig));
xig.xig_len = sizeof xig;
xig.xig_count = n;
xig.xig_gen = gencnt;
xig.xig_sogen = so_gencnt;
error = SYSCTL_OUT(req, &xig, sizeof xig);
- if (error)
+ if (error) {
+ lck_rw_done(tcbinfo.ipi_lock);
return error;
- /*
- * We are done if there is no pcb
- */
- if (n == 0)
- return 0;
+ }
+ /*
+ * We are done if there is no pcb
+ */
+ if (n == 0) {
+ lck_rw_done(tcbinfo.ipi_lock);
+ return 0;
+ }
inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK);
- if (inp_list == 0)
+ if (inp_list == 0) {
+ lck_rw_done(tcbinfo.ipi_lock);
return ENOMEM;
+ }
- s = splnet();
- for (inp = LIST_FIRST(tcbinfo.listhead), i = 0; inp && i < n;
- inp = LIST_NEXT(inp, inp_list)) {
-#ifdef __APPLE__
- if (inp->inp_gencnt <= gencnt)
-#else
- if (inp->inp_gencnt <= gencnt && !prison_xinpcb(req->p, inp))
-#endif
+ LIST_FOREACH(inp, tcbinfo.ipi_listhead, inp_list) {
+ if (inp->inp_gencnt <= gencnt &&
+ inp->inp_state != INPCB_STATE_DEAD)
inp_list[i++] = inp;
+ if (i >= n) break;
}
- splx(s);
+
+ TAILQ_FOREACH(tp, &tcp_tw_tailq, t_twentry) {
+ inp = tp->t_inpcb;
+ if (inp->inp_gencnt <= gencnt &&
+ inp->inp_state != INPCB_STATE_DEAD)
+ inp_list[i++] = inp;
+ if (i >= n) break;
+ }
+
n = i;
error = 0;
for (i = 0; i < n; i++) {
inp = inp_list[i];
- if (inp->inp_gencnt <= gencnt) {
+ if (inp->inp_gencnt <= gencnt &&
+ inp->inp_state != INPCB_STATE_DEAD) {
struct xtcpcb xt;
caddr_t inp_ppcb;
+
+ bzero(&xt, sizeof(xt));
xt.xt_len = sizeof xt;
/* XXX should avoid extra copy */
- bcopy(inp, &xt.xt_inp, sizeof *inp);
+ inpcb_to_compat(inp, &xt.xt_inp);
inp_ppcb = inp->inp_ppcb;
- if (inp_ppcb != NULL)
- bcopy(inp_ppcb, &xt.xt_tp, sizeof xt.xt_tp);
- else
+ if (inp_ppcb != NULL) {
+ tcpcb_to_otcpcb(
+ (struct tcpcb *)(void *)inp_ppcb,
+ &xt.xt_tp);
+ } else {
bzero((char *) &xt.xt_tp, sizeof xt.xt_tp);
+ }
if (inp->inp_socket)
sotoxsocket(inp->inp_socket, &xt.xt_socket);
error = SYSCTL_OUT(req, &xt, sizeof xt);
* while we were processing this request, and it
* might be necessary to retry.
*/
- s = splnet();
+ bzero(&xig, sizeof(xig));
+ xig.xig_len = sizeof xig;
xig.xig_gen = tcbinfo.ipi_gencnt;
xig.xig_sogen = so_gencnt;
xig.xig_count = tcbinfo.ipi_count;
- splx(s);
error = SYSCTL_OUT(req, &xig, sizeof xig);
}
FREE(inp_list, M_TEMP);
+ lck_rw_done(tcbinfo.ipi_lock);
return error;
}
-SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist, CTLFLAG_RD, 0, 0,
+SYSCTL_PROC(_net_inet_tcp, TCPCTL_PCBLIST, pcblist,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0,
tcp_pcblist, "S,xtcpcb", "List of active TCP connections");
-#ifndef __APPLE__
+
+static void
+tcpcb_to_xtcpcb64(struct tcpcb *tp, struct xtcpcb64 *otp)
+{
+ otp->t_segq = (uint32_t)VM_KERNEL_ADDRPERM(tp->t_segq.lh_first);
+ otp->t_dupacks = tp->t_dupacks;
+ otp->t_timer[TCPT_REXMT_EXT] = tp->t_timer[TCPT_REXMT];
+ otp->t_timer[TCPT_PERSIST_EXT] = tp->t_timer[TCPT_PERSIST];
+ otp->t_timer[TCPT_KEEP_EXT] = tp->t_timer[TCPT_KEEP];
+ otp->t_timer[TCPT_2MSL_EXT] = tp->t_timer[TCPT_2MSL];
+ otp->t_state = tp->t_state;
+ otp->t_flags = tp->t_flags;
+ otp->t_force = (tp->t_flagsext & TF_FORCE) ? 1 : 0;
+ otp->snd_una = tp->snd_una;
+ otp->snd_max = tp->snd_max;
+ otp->snd_nxt = tp->snd_nxt;
+ otp->snd_up = tp->snd_up;
+ otp->snd_wl1 = tp->snd_wl1;
+ otp->snd_wl2 = tp->snd_wl2;
+ otp->iss = tp->iss;
+ otp->irs = tp->irs;
+ otp->rcv_nxt = tp->rcv_nxt;
+ otp->rcv_adv = tp->rcv_adv;
+ otp->rcv_wnd = tp->rcv_wnd;
+ otp->rcv_up = tp->rcv_up;
+ otp->snd_wnd = tp->snd_wnd;
+ otp->snd_cwnd = tp->snd_cwnd;
+ otp->snd_ssthresh = tp->snd_ssthresh;
+ otp->t_maxopd = tp->t_maxopd;
+ otp->t_rcvtime = tp->t_rcvtime;
+ otp->t_starttime = tp->t_starttime;
+ otp->t_rtttime = tp->t_rtttime;
+ otp->t_rtseq = tp->t_rtseq;
+ otp->t_rxtcur = tp->t_rxtcur;
+ otp->t_maxseg = tp->t_maxseg;
+ otp->t_srtt = tp->t_srtt;
+ otp->t_rttvar = tp->t_rttvar;
+ otp->t_rxtshift = tp->t_rxtshift;
+ otp->t_rttmin = tp->t_rttmin;
+ otp->t_rttupdated = tp->t_rttupdated;
+ otp->max_sndwnd = tp->max_sndwnd;
+ otp->t_softerror = tp->t_softerror;
+ otp->t_oobflags = tp->t_oobflags;
+ otp->t_iobc = tp->t_iobc;
+ otp->snd_scale = tp->snd_scale;
+ otp->rcv_scale = tp->rcv_scale;
+ otp->request_r_scale = tp->request_r_scale;
+ otp->requested_s_scale = tp->requested_s_scale;
+ otp->ts_recent = tp->ts_recent;
+ otp->ts_recent_age = tp->ts_recent_age;
+ otp->last_ack_sent = tp->last_ack_sent;
+ otp->cc_send = 0;
+ otp->cc_recv = 0;
+ otp->snd_recover = tp->snd_recover;
+ otp->snd_cwnd_prev = tp->snd_cwnd_prev;
+ otp->snd_ssthresh_prev = tp->snd_ssthresh_prev;
+ otp->t_badrxtwin = 0;
+}
+
+
static int
-tcp_getcred(SYSCTL_HANDLER_ARGS)
+tcp_pcblist64 SYSCTL_HANDLER_ARGS
{
- struct sockaddr_in addrs[2];
- struct inpcb *inp;
- int error, s;
+#pragma unused(oidp, arg1, arg2)
+ int error, i = 0, n;
+ struct inpcb *inp, **inp_list;
+ struct tcpcb *tp;
+ inp_gen_t gencnt;
+ struct xinpgen xig;
- error = suser(req->p);
- if (error)
- return (error);
- error = SYSCTL_IN(req, addrs, sizeof(addrs));
- if (error)
- return (error);
- s = splnet();
- inp = in_pcblookup_hash(&tcbinfo, addrs[1].sin_addr, addrs[1].sin_port,
- addrs[0].sin_addr, addrs[0].sin_port, 0, NULL);
- if (inp == NULL || inp->inp_socket == NULL) {
- error = ENOENT;
- goto out;
- }
- error = SYSCTL_OUT(req, inp->inp_socket->so_cred, sizeof(struct ucred));
-out:
- splx(s);
- return (error);
+ /*
+ * The process of preparing the TCB list is too time-consuming and
+ * resource-intensive to repeat twice on every request.
+ */
+ lck_rw_lock_shared(tcbinfo.ipi_lock);
+ if (req->oldptr == USER_ADDR_NULL) {
+ n = tcbinfo.ipi_count;
+ req->oldidx = 2 * (sizeof xig)
+ + (n + n/8) * sizeof(struct xtcpcb64);
+ lck_rw_done(tcbinfo.ipi_lock);
+ return 0;
+ }
+
+ if (req->newptr != USER_ADDR_NULL) {
+ lck_rw_done(tcbinfo.ipi_lock);
+ return EPERM;
+ }
+
+ /*
+ * OK, now we're committed to doing something.
+ */
+ gencnt = tcbinfo.ipi_gencnt;
+ n = tcbinfo.ipi_count;
+
+ bzero(&xig, sizeof(xig));
+ xig.xig_len = sizeof xig;
+ xig.xig_count = n;
+ xig.xig_gen = gencnt;
+ xig.xig_sogen = so_gencnt;
+ error = SYSCTL_OUT(req, &xig, sizeof xig);
+ if (error) {
+ lck_rw_done(tcbinfo.ipi_lock);
+ return error;
+ }
+ /*
+ * We are done if there is no pcb
+ */
+ if (n == 0) {
+ lck_rw_done(tcbinfo.ipi_lock);
+ return 0;
+ }
+
+ inp_list = _MALLOC(n * sizeof *inp_list, M_TEMP, M_WAITOK);
+ if (inp_list == 0) {
+ lck_rw_done(tcbinfo.ipi_lock);
+ return ENOMEM;
+ }
+
+ LIST_FOREACH(inp, tcbinfo.ipi_listhead, inp_list) {
+ if (inp->inp_gencnt <= gencnt &&
+ inp->inp_state != INPCB_STATE_DEAD)
+ inp_list[i++] = inp;
+ if (i >= n) break;
+ }
+
+ TAILQ_FOREACH(tp, &tcp_tw_tailq, t_twentry) {
+ inp = tp->t_inpcb;
+ if (inp->inp_gencnt <= gencnt &&
+ inp->inp_state != INPCB_STATE_DEAD)
+ inp_list[i++] = inp;
+ if (i >= n) break;
+ }
+
+ n = i;
+
+ error = 0;
+ for (i = 0; i < n; i++) {
+ inp = inp_list[i];
+ if (inp->inp_gencnt <= gencnt && inp->inp_state != INPCB_STATE_DEAD) {
+ struct xtcpcb64 xt;
+
+ bzero(&xt, sizeof(xt));
+ xt.xt_len = sizeof xt;
+ inpcb_to_xinpcb64(inp, &xt.xt_inpcb);
+ xt.xt_inpcb.inp_ppcb = (uint64_t)VM_KERNEL_ADDRPERM(inp->inp_ppcb);
+ if (inp->inp_ppcb != NULL)
+ tcpcb_to_xtcpcb64((struct tcpcb *)inp->inp_ppcb, &xt);
+ if (inp->inp_socket)
+ sotoxsocket64(inp->inp_socket, &xt.xt_inpcb.xi_socket);
+ error = SYSCTL_OUT(req, &xt, sizeof xt);
+ }
+ }
+ if (!error) {
+ /*
+ * Give the user an updated idea of our state.
+ * If the generation differs from what we told
+ * her before, she knows that something happened
+ * while we were processing this request, and it
+ * might be necessary to retry.
+ */
+ bzero(&xig, sizeof(xig));
+ xig.xig_len = sizeof xig;
+ xig.xig_gen = tcbinfo.ipi_gencnt;
+ xig.xig_sogen = so_gencnt;
+ xig.xig_count = tcbinfo.ipi_count;
+ error = SYSCTL_OUT(req, &xig, sizeof xig);
+ }
+ FREE(inp_list, M_TEMP);
+ lck_rw_done(tcbinfo.ipi_lock);
+ return error;
}
-SYSCTL_PROC(_net_inet_tcp, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
- 0, 0, tcp_getcred, "S,ucred", "Get the ucred of a TCP connection");
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, pcblist64,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0,
+ tcp_pcblist64, "S,xtcpcb64", "List of active TCP connections");
+
-#if INET6
static int
-tcp6_getcred(SYSCTL_HANDLER_ARGS)
+tcp_pcblist_n SYSCTL_HANDLER_ARGS
{
- struct sockaddr_in6 addrs[2];
- struct inpcb *inp;
- int error, s, mapped = 0;
+#pragma unused(oidp, arg1, arg2)
+ int error = 0;
+
+ error = get_pcblist_n(IPPROTO_TCP, req, &tcbinfo);
+
+ return error;
+}
- error = suser(req->p);
- if (error)
- return (error);
- error = SYSCTL_IN(req, addrs, sizeof(addrs));
- if (error)
- return (error);
- if (IN6_IS_ADDR_V4MAPPED(&addrs[0].sin6_addr)) {
- if (IN6_IS_ADDR_V4MAPPED(&addrs[1].sin6_addr))
- mapped = 1;
- else
- return (EINVAL);
- }
- s = splnet();
- if (mapped == 1)
- inp = in_pcblookup_hash(&tcbinfo,
- *(struct in_addr *)&addrs[1].sin6_addr.s6_addr[12],
- addrs[1].sin6_port,
- *(struct in_addr *)&addrs[0].sin6_addr.s6_addr[12],
- addrs[0].sin6_port,
- 0, NULL);
- else
- inp = in6_pcblookup_hash(&tcbinfo, &addrs[1].sin6_addr,
- addrs[1].sin6_port,
- &addrs[0].sin6_addr, addrs[0].sin6_port,
- 0, NULL);
- if (inp == NULL || inp->inp_socket == NULL) {
- error = ENOENT;
- goto out;
- }
- error = SYSCTL_OUT(req, inp->inp_socket->so_cred,
- sizeof(struct ucred));
-out:
- splx(s);
- return (error);
+
+SYSCTL_PROC(_net_inet_tcp, OID_AUTO, pcblist_n,
+ CTLTYPE_STRUCT | CTLFLAG_RD | CTLFLAG_LOCKED, 0, 0,
+ tcp_pcblist_n, "S,xtcpcb_n", "List of active TCP connections");
+
+
+__private_extern__ void
+tcp_get_ports_used(uint32_t ifindex, int protocol, uint32_t flags,
+ bitstr_t *bitfield)
+{
+ inpcb_get_ports_used(ifindex, protocol, flags,
+ bitfield, &tcbinfo);
}
-SYSCTL_PROC(_net_inet6_tcp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
- 0, 0,
- tcp6_getcred, "S,ucred", "Get the ucred of a TCP6 connection");
-#endif
-#endif /* __APPLE__*/
+__private_extern__ uint32_t
+tcp_count_opportunistic(unsigned int ifindex, u_int32_t flags)
+{
+ return inpcb_count_opportunistic(ifindex, &tcbinfo, flags);
+}
+
+__private_extern__ uint32_t
+tcp_find_anypcb_byaddr(struct ifaddr *ifa)
+{
+ return inpcb_find_anypcb_byaddr(ifa, &tcbinfo);
+}
void
tcp_ctlinput(cmd, sa, vip)
struct sockaddr *sa;
void *vip;
{
+ tcp_seq icmp_tcp_seq;
struct ip *ip = vip;
- struct tcphdr *th;
struct in_addr faddr;
struct inpcb *inp;
struct tcpcb *tp;
- void (*notify) __P((struct inpcb *, int)) = tcp_notify;
- tcp_seq icmp_seq;
- int s;
- faddr = ((struct sockaddr_in *)sa)->sin_addr;
+ void (*notify)(struct inpcb *, int) = tcp_notify;
+
+ faddr = ((struct sockaddr_in *)(void *)sa)->sin_addr;
if (sa->sa_family != AF_INET || faddr.s_addr == INADDR_ANY)
return;
- if (cmd == PRC_QUENCH)
- notify = tcp_quench;
+ if ((unsigned)cmd >= PRC_NCMDS)
+ return;
+
+ if (cmd == PRC_MSGSIZE)
+ notify = tcp_mtudisc;
else if (icmp_may_rst && (cmd == PRC_UNREACH_ADMIN_PROHIB ||
cmd == PRC_UNREACH_PORT) && ip)
notify = tcp_drop_syn_sent;
- else if (cmd == PRC_MSGSIZE)
- notify = tcp_mtudisc;
else if (PRC_IS_REDIRECT(cmd)) {
ip = 0;
notify = in_rtchange;
} else if (cmd == PRC_HOSTDEAD)
ip = 0;
- else if ((unsigned)cmd > PRC_NCMDS || inetctlerrmap[cmd] == 0)
+ /* Source quench is deprecated */
+ else if (cmd == PRC_QUENCH)
+ return;
+ else if (inetctlerrmap[cmd] == 0)
return;
if (ip) {
- s = splnet();
- th = (struct tcphdr *)((caddr_t)ip
- + (IP_VHL_HL(ip->ip_vhl) << 2));
- inp = in_pcblookup_hash(&tcbinfo, faddr, th->th_dport,
- ip->ip_src, th->th_sport, 0, NULL);
+ struct tcphdr th;
+ struct icmp *icp;
+
+ icp = (struct icmp *)(void *)
+ ((caddr_t)ip - offsetof(struct icmp, icmp_ip));
+ bcopy(((caddr_t)ip + (IP_VHL_HL(ip->ip_vhl) << 2)),
+ &th, sizeof (th));
+ inp = in_pcblookup_hash(&tcbinfo, faddr, th.th_dport,
+ ip->ip_src, th.th_sport, 0, NULL);
if (inp != NULL && inp->inp_socket != NULL) {
- icmp_seq = htonl(th->th_seq);
+ tcp_lock(inp->inp_socket, 1, 0);
+ if (in_pcb_checkstate(inp, WNT_RELEASE, 1) == WNT_STOPUSING) {
+ tcp_unlock(inp->inp_socket, 1, 0);
+ return;
+ }
+ icmp_tcp_seq = htonl(th.th_seq);
tp = intotcpcb(inp);
- if (SEQ_GEQ(icmp_seq, tp->snd_una) &&
- SEQ_LT(icmp_seq, tp->snd_max))
+ if (SEQ_GEQ(icmp_tcp_seq, tp->snd_una) &&
+ SEQ_LT(icmp_tcp_seq, tp->snd_max)) {
+ if (cmd == PRC_MSGSIZE) {
+
+ /*
+ * MTU discovery:
+ * If we got a needfrag and there is a host route to the
+ * original destination, and the MTU is not locked, then
+ * set the MTU in the route to the suggested new value
+ * (if given) and then notify as usual. The ULPs will
+ * notice that the MTU has changed and adapt accordingly.
+ * If no new MTU was suggested, then we guess a new one
+ * less than the current value. If the new MTU is
+ * unreasonably small (defined by sysctl tcp_minmss), then
+ * we reset the MTU to the interface value and enable the
+ * lock bit, indicating that we are no longer doing MTU
+ * discovery.
+ */
+ struct rtentry *rt;
+ int mtu;
+ struct sockaddr_in icmpsrc = { sizeof (struct sockaddr_in), AF_INET,
+ 0 , { 0 }, { 0,0,0,0,0,0,0,0 } };
+ icmpsrc.sin_addr = icp->icmp_ip.ip_dst;
+
+ rt = rtalloc1((struct sockaddr *)&icmpsrc, 0,
+ RTF_CLONING | RTF_PRCLONING);
+ if (rt != NULL) {
+ RT_LOCK(rt);
+ if ((rt->rt_flags & RTF_HOST) &&
+ !(rt->rt_rmx.rmx_locks & RTV_MTU)) {
+ mtu = ntohs(icp->icmp_nextmtu);
+ if (!mtu)
+ mtu = ip_next_mtu(rt->rt_rmx.
+ rmx_mtu, 1);
+#if DEBUG_MTUDISC
+ printf("MTU for %s reduced to %d\n",
+ inet_ntop(AF_INET,
+ &icmpsrc.sin_addr, ipv4str,
+ sizeof (ipv4str)), mtu);
+#endif
+ if (mtu < max(296, (tcp_minmss +
+ sizeof (struct tcpiphdr)))) {
+ /* rt->rt_rmx.rmx_mtu =
+ rt->rt_ifp->if_mtu; */
+ rt->rt_rmx.rmx_locks |= RTV_MTU;
+ } else if (rt->rt_rmx.rmx_mtu > mtu) {
+ rt->rt_rmx.rmx_mtu = mtu;
+ }
+ }
+ RT_UNLOCK(rt);
+ rtfree(rt);
+ }
+ }
+
(*notify)(inp, inetctlerrmap[cmd]);
+ }
+ tcp_unlock(inp->inp_socket, 1, 0);
}
- splx(s);
} else
- in_pcbnotifyall(&tcb, faddr, inetctlerrmap[cmd], notify);
+ in_pcbnotifyall(&tcbinfo, faddr, inetctlerrmap[cmd], notify);
}
#if INET6
void *d;
{
struct tcphdr th;
- void (*notify) __P((struct inpcb *, int)) = tcp_notify;
+ void (*notify)(struct inpcb *, int) = tcp_notify;
struct ip6_hdr *ip6;
struct mbuf *m;
struct ip6ctlparam *ip6cp = NULL;
sa->sa_len != sizeof(struct sockaddr_in6))
return;
- if (cmd == PRC_QUENCH)
- notify = tcp_quench;
- else if (cmd == PRC_MSGSIZE)
+ if ((unsigned)cmd >= PRC_NCMDS)
+ return;
+
+ if (cmd == PRC_MSGSIZE)
notify = tcp_mtudisc;
- else if (!PRC_IS_REDIRECT(cmd) &&
- ((unsigned)cmd > PRC_NCMDS || inet6ctlerrmap[cmd] == 0))
+ else if (!PRC_IS_REDIRECT(cmd) && (inet6ctlerrmap[cmd] == 0))
+ return;
+ /* Source quench is deprecated */
+ else if (cmd == PRC_QUENCH)
return;
/* if the parameter is from icmp6, decode it. */
bzero(&th, sizeof(th));
m_copydata(m, off, sizeof(*thp), (caddr_t)&th);
- in6_pcbnotify(&tcb, sa, th.th_dport,
+ in6_pcbnotify(&tcbinfo, sa, th.th_dport,
(struct sockaddr *)ip6cp->ip6c_src,
- th.th_sport, cmd, notify);
- } else
- in6_pcbnotify(&tcb, sa, 0, (struct sockaddr *)sa6_src,
- 0, cmd, notify);
+ th.th_sport, cmd, NULL, notify);
+ } else {
+ in6_pcbnotify(&tcbinfo, sa, 0,
+ (struct sockaddr *)(size_t)sa6_src, 0, cmd, NULL, notify);
+ }
}
#endif /* INET6 */
#define ISN_BYTES_PER_SECOND 1048576
-u_char isn_secret[32];
-int isn_last_reseed;
-MD5_CTX isn_ctx;
-
tcp_seq
tcp_new_isn(tp)
struct tcpcb *tp;
{
u_int32_t md5_buffer[4];
tcp_seq new_isn;
- struct timeval time;
+ struct timeval timenow;
+ u_char isn_secret[32];
+ int isn_last_reseed = 0;
+ MD5_CTX isn_ctx;
/* Use arc4random for SYN-ACKs when not in exact RFC1948 mode. */
if (((tp->t_state == TCPS_LISTEN) || (tp->t_state == TCPS_TIME_WAIT))
&& tcp_strict_rfc1948 == 0)
#ifdef __APPLE__
- return random();
+ return RandomULong();
#else
return arc4random();
#endif
+ getmicrotime(&timenow);
/* Seed if this is the first use, reseed if requested. */
if ((isn_last_reseed == 0) ||
((tcp_strict_rfc1948 == 0) && (tcp_isn_reseed_interval > 0) &&
(((u_int)isn_last_reseed + (u_int)tcp_isn_reseed_interval*hz)
- < (u_int)time.tv_sec))) {
+ < (u_int)timenow.tv_sec))) {
#ifdef __APPLE__
read_random(&isn_secret, sizeof(isn_secret));
#else
read_random_unlimited(&isn_secret, sizeof(isn_secret));
#endif
- isn_last_reseed = time.tv_sec;
+ isn_last_reseed = timenow.tv_sec;
}
/* Compute the md5 hash and return the ISN. */
MD5Update(&isn_ctx, (u_char *) &isn_secret, sizeof(isn_secret));
MD5Final((u_char *) &md5_buffer, &isn_ctx);
new_isn = (tcp_seq) md5_buffer[0];
- new_isn += time.tv_sec * (ISN_BYTES_PER_SECOND / hz);
+ new_isn += timenow.tv_sec * (ISN_BYTES_PER_SECOND / hz);
return new_isn;
}
-/*
- * When a source quench is received, close congestion window
- * to one segment. We will gradually open it again as we proceed.
- */
-void
-tcp_quench(inp, errno)
- struct inpcb *inp;
- int errno;
-{
- struct tcpcb *tp = intotcpcb(inp);
-
- if (tp)
- tp->snd_cwnd = tp->t_maxseg;
-}
/*
* When a specific ICMP unreachable message is received and the
* This duplicates some code in the tcp_mss() function in tcp_input.c.
*/
void
-tcp_mtudisc(inp, errno)
- struct inpcb *inp;
- int errno;
+tcp_mtudisc(
+ struct inpcb *inp,
+ __unused int errno
+)
{
struct tcpcb *tp = intotcpcb(inp);
struct rtentry *rt;
struct socket *so = inp->inp_socket;
int offered;
int mss;
+ u_int32_t mtu;
#if INET6
int isipv6 = (tp->t_inpcb->inp_vflag & INP_IPV6) != 0;
#endif /* INET6 */
if (tp) {
#if INET6
if (isipv6)
- rt = tcp_rtlookup6(inp);
+ rt = tcp_rtlookup6(inp, IFSCOPE_NONE);
else
#endif /* INET6 */
- rt = tcp_rtlookup(inp);
+ rt = tcp_rtlookup(inp, IFSCOPE_NONE);
if (!rt || !rt->rt_rmx.rmx_mtu) {
tp->t_maxopd = tp->t_maxseg =
#if INET6
isipv6 ? tcp_v6mssdflt :
#endif /* INET6 */
tcp_mssdflt;
+
+ /* Route locked during lookup above */
+ if (rt != NULL)
+ RT_UNLOCK(rt);
return;
}
taop = rmx_taop(rt->rt_rmx);
offered = taop->tao_mssopt;
- mss = rt->rt_rmx.rmx_mtu -
+ mtu = rt->rt_rmx.rmx_mtu;
+
+ /* Route locked during lookup above */
+ RT_UNLOCK(rt);
+
+#if NECP
+ // Adjust MTU if necessary.
+ mtu = necp_socket_get_effective_mtu(inp, mtu);
+#endif /* NECP */
+
+ mss = mtu -
#if INET6
(isipv6 ?
sizeof(struct ip6_hdr) + sizeof(struct tcphdr) :
if ((tp->t_flags & (TF_REQ_TSTMP|TF_NOOPT)) == TF_REQ_TSTMP &&
(tp->t_flags & TF_RCVD_TSTMP) == TF_RCVD_TSTMP)
mss -= TCPOLEN_TSTAMP_APPA;
- if ((tp->t_flags & (TF_REQ_CC|TF_NOOPT)) == TF_REQ_CC &&
- (tp->t_flags & TF_RCVD_CC) == TF_RCVD_CC)
- mss -= TCPOLEN_CC_APPA;
+#if MPTCP
+ mss -= mptcp_adj_mss(tp, TRUE);
+#endif
if (so->so_snd.sb_hiwat < mss)
mss = so->so_snd.sb_hiwat;
tp->t_maxseg = mss;
+ /*
+ * Reset the slow-start flight size as it may depends on the new MSS
+ */
+ if (CC_ALGO(tp)->cwnd_init != NULL)
+ CC_ALGO(tp)->cwnd_init(tp);
tcpstat.tcps_mturesent++;
tp->t_rtttime = 0;
tp->snd_nxt = tp->snd_una;
* Look-up the routing entry to the peer of this inpcb. If no route
* is found and it cannot be allocated the return NULL. This routine
* is called by TCP routines that access the rmx structure and by tcp_mss
- * to get the interface MTU.
+ * to get the interface MTU. If a route is found, this routine will
+ * hold the rtentry lock; the caller is responsible for unlocking.
*/
struct rtentry *
-tcp_rtlookup(inp)
+tcp_rtlookup(inp, input_ifscope)
struct inpcb *inp;
+ unsigned int input_ifscope;
{
struct route *ro;
struct rtentry *rt;
+ struct tcpcb *tp;
+
+ lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
ro = &inp->inp_route;
- if (ro == NULL)
- return (NULL);
- rt = ro->ro_rt;
- if (rt == NULL || !(rt->rt_flags & RTF_UP) || rt->generation_id != route_generation) {
+ if ((rt = ro->ro_rt) != NULL)
+ RT_LOCK(rt);
+
+ if (ROUTE_UNUSABLE(ro)) {
+ if (rt != NULL) {
+ RT_UNLOCK(rt);
+ rt = NULL;
+ }
+ ROUTE_RELEASE(ro);
/* No route yet, so try to acquire one */
if (inp->inp_faddr.s_addr != INADDR_ANY) {
+ unsigned int ifscope;
+
ro->ro_dst.sa_family = AF_INET;
ro->ro_dst.sa_len = sizeof(struct sockaddr_in);
- ((struct sockaddr_in *) &ro->ro_dst)->sin_addr =
+ ((struct sockaddr_in *)(void *)&ro->ro_dst)->sin_addr =
inp->inp_faddr;
- rtalloc(ro);
- rt = ro->ro_rt;
+
+ /*
+ * If the socket was bound to an interface, then
+ * the bound-to-interface takes precedence over
+ * the inbound interface passed in by the caller
+ * (if we get here as part of the output path then
+ * input_ifscope is IFSCOPE_NONE).
+ */
+ ifscope = (inp->inp_flags & INP_BOUND_IF) ?
+ inp->inp_boundifp->if_index : input_ifscope;
+
+ rtalloc_scoped(ro, ifscope);
+ if ((rt = ro->ro_rt) != NULL)
+ RT_LOCK(rt);
}
}
+ if (rt != NULL)
+ RT_LOCK_ASSERT_HELD(rt);
+
+ /*
+ * Update MTU discovery determination. Don't do it if:
+ * 1) it is disabled via the sysctl
+ * 2) the route isn't up
+ * 3) the MTU is locked (if it is, then discovery has been
+ * disabled)
+ */
+
+ tp = intotcpcb(inp);
+
+ if (!path_mtu_discovery || ((rt != NULL) &&
+ (!(rt->rt_flags & RTF_UP) || (rt->rt_rmx.rmx_locks & RTV_MTU))))
+ tp->t_flags &= ~TF_PMTUD;
+ else
+ tp->t_flags |= TF_PMTUD;
+
+#if CONFIG_IFEF_NOWINDOWSCALE
+ if (tcp_obey_ifef_nowindowscale &&
+ tp->t_state == TCPS_SYN_SENT && rt != NULL && rt->rt_ifp != NULL &&
+ (rt->rt_ifp->if_eflags & IFEF_NOWINDOWSCALE)) {
+ /* Window scaling is enabled on this interface */
+ tp->t_flags &= ~TF_REQ_SCALE;
+ }
+#endif
+
+ if (rt != NULL && rt->rt_ifp != NULL) {
+ somultipages(inp->inp_socket,
+ (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES));
+ tcp_set_tso(tp, rt->rt_ifp);
+ soif2kcl(inp->inp_socket,
+ (rt->rt_ifp->if_eflags & IFEF_2KCL));
+ tcp_set_ecn(tp, rt->rt_ifp);
+ }
+
+ /* Note if the peer is local */
+ if (rt != NULL && !(rt->rt_ifp->if_flags & IFF_POINTOPOINT) &&
+ (rt->rt_gateway->sa_family == AF_LINK ||
+ rt->rt_ifp->if_flags & IFF_LOOPBACK ||
+ in_localaddr(inp->inp_faddr))) {
+ tp->t_flags |= TF_LOCAL;
+ }
+
+ /*
+ * Caller needs to call RT_UNLOCK(rt).
+ */
return rt;
}
#if INET6
struct rtentry *
-tcp_rtlookup6(inp)
+tcp_rtlookup6(inp, input_ifscope)
struct inpcb *inp;
+ unsigned int input_ifscope;
{
struct route_in6 *ro6;
struct rtentry *rt;
+ struct tcpcb *tp;
+
+ lck_mtx_assert(rnh_lock, LCK_MTX_ASSERT_NOTOWNED);
ro6 = &inp->in6p_route;
- rt = ro6->ro_rt;
- if (rt == NULL || !(rt->rt_flags & RTF_UP)) {
+ if ((rt = ro6->ro_rt) != NULL)
+ RT_LOCK(rt);
+
+ if (ROUTE_UNUSABLE(ro6)) {
+ if (rt != NULL) {
+ RT_UNLOCK(rt);
+ rt = NULL;
+ }
+ ROUTE_RELEASE(ro6);
/* No route yet, so try to acquire one */
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
struct sockaddr_in6 *dst6;
+ unsigned int ifscope;
dst6 = (struct sockaddr_in6 *)&ro6->ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(*dst6);
dst6->sin6_addr = inp->in6p_faddr;
- rtalloc((struct route *)ro6);
- rt = ro6->ro_rt;
+
+ /*
+ * If the socket was bound to an interface, then
+ * the bound-to-interface takes precedence over
+ * the inbound interface passed in by the caller
+ * (if we get here as part of the output path then
+ * input_ifscope is IFSCOPE_NONE).
+ */
+ ifscope = (inp->inp_flags & INP_BOUND_IF) ?
+ inp->inp_boundifp->if_index : input_ifscope;
+
+ rtalloc_scoped((struct route *)ro6, ifscope);
+ if ((rt = ro6->ro_rt) != NULL)
+ RT_LOCK(rt);
}
}
+ if (rt != NULL)
+ RT_LOCK_ASSERT_HELD(rt);
+
+ /*
+ * Update path MTU Discovery determination
+ * while looking up the route:
+ * 1) we have a valid route to the destination
+ * 2) the MTU is not locked (if it is, then discovery has been
+ * disabled)
+ */
+
+
+ tp = intotcpcb(inp);
+
+ /*
+ * Update MTU discovery determination. Don't do it if:
+ * 1) it is disabled via the sysctl
+ * 2) the route isn't up
+ * 3) the MTU is locked (if it is, then discovery has been
+ * disabled)
+ */
+
+ if (!path_mtu_discovery || ((rt != NULL) &&
+ (!(rt->rt_flags & RTF_UP) || (rt->rt_rmx.rmx_locks & RTV_MTU))))
+ tp->t_flags &= ~TF_PMTUD;
+ else
+ tp->t_flags |= TF_PMTUD;
+
+#if CONFIG_IFEF_NOWINDOWSCALE
+ if (tcp_obey_ifef_nowindowscale &&
+ tp->t_state == TCPS_SYN_SENT && rt != NULL && rt->rt_ifp != NULL &&
+ (rt->rt_ifp->if_eflags & IFEF_NOWINDOWSCALE)) {
+ /* Window scaling is not enabled on this interface */
+ tp->t_flags &= ~TF_REQ_SCALE;
+ }
+#endif
+
+ if (rt != NULL && rt->rt_ifp != NULL) {
+ somultipages(inp->inp_socket,
+ (rt->rt_ifp->if_hwassist & IFNET_MULTIPAGES));
+ tcp_set_tso(tp, rt->rt_ifp);
+ soif2kcl(inp->inp_socket,
+ (rt->rt_ifp->if_eflags & IFEF_2KCL));
+ tcp_set_ecn(tp, rt->rt_ifp);
+ }
+
+ /* Note if the peer is local */
+ if (rt != NULL && !(rt->rt_ifp->if_flags & IFF_POINTOPOINT) &&
+ (IN6_IS_ADDR_LOOPBACK(&inp->in6p_faddr) ||
+ IN6_IS_ADDR_LINKLOCAL(&inp->in6p_faddr) ||
+ rt->rt_gateway->sa_family == AF_LINK ||
+ in6_localaddr(&inp->in6p_faddr))) {
+ tp->t_flags |= TF_LOCAL;
+ }
+
+ /*
+ * Caller needs to call RT_UNLOCK(rt).
+ */
return rt;
}
#endif /* INET6 */
if ((tp == NULL) || ((inp = tp->t_inpcb) == NULL))
return 0;
- MGETHDR(m, M_DONTWAIT, MT_DATA);
+ MGETHDR(m, M_DONTWAIT, MT_DATA); /* MAC-OK */
if (!m)
return 0;
#if INET6
if ((inp->inp_vflag & INP_IPV6) != 0) {
ip6 = mtod(m, struct ip6_hdr *);
- th = (struct tcphdr *)(ip6 + 1);
+ th = (struct tcphdr *)(void *)(ip6 + 1);
m->m_pkthdr.len = m->m_len =
sizeof(struct ip6_hdr) + sizeof(struct tcphdr);
tcp_fillheaders(tp, ip6, th);
tcp_fillheaders(tp, ip, th);
hdrsiz = ipsec4_hdrsiz(m, IPSEC_DIR_OUTBOUND, inp);
}
-
m_free(m);
return hdrsiz;
}
struct inpcb *inp;
{
struct rtentry *rt;
+ struct rmxp_tao *taop;
#if INET6
if ((inp->inp_vflag & INP_IPV6) != 0)
- rt = tcp_rtlookup6(inp);
+ rt = tcp_rtlookup6(inp, IFSCOPE_NONE);
else
#endif /* INET6 */
- rt = tcp_rtlookup(inp);
+ rt = tcp_rtlookup(inp, IFSCOPE_NONE);
/* Make sure this is a host route and is up. */
if (rt == NULL ||
- (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST))
+ (rt->rt_flags & (RTF_UP|RTF_HOST)) != (RTF_UP|RTF_HOST)) {
+ /* Route locked during lookup above */
+ if (rt != NULL)
+ RT_UNLOCK(rt);
return NULL;
-
- return rmx_taop(rt->rt_rmx);
+ }
+
+ taop = rmx_taop(rt->rt_rmx);
+ /* Route locked during lookup above */
+ RT_UNLOCK(rt);
+ return (taop);
}
/*
tcp_cleartaocache()
{
}
+
+int
+tcp_lock(struct socket *so, int refcount, void *lr)
+{
+ void *lr_saved;
+
+ if (lr == NULL)
+ lr_saved = __builtin_return_address(0);
+ else
+ lr_saved = lr;
+
+ if (so->so_pcb != NULL) {
+ lck_mtx_lock(&((struct inpcb *)so->so_pcb)->inpcb_mtx);
+ } else {
+ panic("tcp_lock: so=%p NO PCB! lr=%p lrh= %s\n",
+ so, lr_saved, solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+
+ if (so->so_usecount < 0) {
+ panic("tcp_lock: so=%p so_pcb=%p lr=%p ref=%x lrh= %s\n",
+ so, so->so_pcb, lr_saved, so->so_usecount, solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+ if (refcount)
+ so->so_usecount++;
+ so->lock_lr[so->next_lock_lr] = lr_saved;
+ so->next_lock_lr = (so->next_lock_lr+1) % SO_LCKDBG_MAX;
+ return (0);
+}
+
+int
+tcp_unlock(struct socket *so, int refcount, void *lr)
+{
+ void *lr_saved;
+
+ if (lr == NULL)
+ lr_saved = __builtin_return_address(0);
+ else
+ lr_saved = lr;
+
+#ifdef MORE_TCPLOCK_DEBUG
+ printf("tcp_unlock: so=0x%llx sopcb=0x%llx lock=0x%llx ref=%x "
+ "lr=0x%llx\n", (uint64_t)VM_KERNEL_ADDRPERM(so),
+ (uint64_t)VM_KERNEL_ADDRPERM(so->so_pcb),
+ (uint64_t)VM_KERNEL_ADDRPERM(&(sotoinpcb(so)->inpcb_mtx)),
+ so->so_usecount, (uint64_t)VM_KERNEL_ADDRPERM(lr_saved));
+#endif
+ if (refcount)
+ so->so_usecount--;
+
+ if (so->so_usecount < 0) {
+ panic("tcp_unlock: so=%p usecount=%x lrh= %s\n",
+ so, so->so_usecount, solockhistory_nr(so));
+ /* NOTREACHED */
+ }
+ if (so->so_pcb == NULL) {
+ panic("tcp_unlock: so=%p NO PCB usecount=%x lr=%p lrh= %s\n",
+ so, so->so_usecount, lr_saved, solockhistory_nr(so));
+ /* NOTREACHED */
+ } else {
+ lck_mtx_assert(&((struct inpcb *)so->so_pcb)->inpcb_mtx,
+ LCK_MTX_ASSERT_OWNED);
+ so->unlock_lr[so->next_unlock_lr] = lr_saved;
+ so->next_unlock_lr = (so->next_unlock_lr+1) % SO_LCKDBG_MAX;
+ lck_mtx_unlock(&((struct inpcb *)so->so_pcb)->inpcb_mtx);
+ }
+ return (0);
+}
+
+lck_mtx_t *
+tcp_getlock(
+ struct socket *so,
+ __unused int locktype)
+{
+ struct inpcb *inp = sotoinpcb(so);
+
+ if (so->so_pcb) {
+ if (so->so_usecount < 0)
+ panic("tcp_getlock: so=%p usecount=%x lrh= %s\n",
+ so, so->so_usecount, solockhistory_nr(so));
+ return(&inp->inpcb_mtx);
+ }
+ else {
+ panic("tcp_getlock: so=%p NULL so_pcb %s\n",
+ so, solockhistory_nr(so));
+ return (so->so_proto->pr_domain->dom_mtx);
+ }
+}
+
+/*
+ * Determine if we can grow the recieve socket buffer to avoid sending
+ * a zero window update to the peer. We allow even socket buffers that
+ * have fixed size (set by the application) to grow if the resource
+ * constraints are met. They will also be trimmed after the application
+ * reads data.
+ */
+static void
+tcp_sbrcv_grow_rwin(struct tcpcb *tp, struct sockbuf *sb)
+{
+ u_int32_t rcvbufinc = tp->t_maxseg << 4;
+ u_int32_t rcvbuf = sb->sb_hiwat;
+ struct socket *so = tp->t_inpcb->inp_socket;
+
+ /*
+ * If message delivery is enabled, do not count
+ * unordered bytes in receive buffer towards hiwat
+ */
+ if (so->so_flags & SOF_ENABLE_MSGS)
+ rcvbuf = rcvbuf - so->so_msg_state->msg_uno_bytes;
+
+ if (tcp_do_autorcvbuf == 1 &&
+ tcp_cansbgrow(sb) &&
+ (tp->t_flags & TF_SLOWLINK) == 0 &&
+ (so->so_flags1 & SOF1_EXTEND_BK_IDLE_WANTED) == 0 &&
+ (rcvbuf - sb->sb_cc) < rcvbufinc &&
+ rcvbuf < tcp_autorcvbuf_max &&
+ (sb->sb_idealsize > 0 &&
+ sb->sb_hiwat <= (sb->sb_idealsize + rcvbufinc))) {
+ sbreserve(sb,
+ min((sb->sb_hiwat + rcvbufinc), tcp_autorcvbuf_max));
+ }
+}
+
+int32_t
+tcp_sbspace(struct tcpcb *tp)
+{
+ struct sockbuf *sb = &tp->t_inpcb->inp_socket->so_rcv;
+ u_int32_t rcvbuf = sb->sb_hiwat;
+ int32_t space;
+ struct socket *so = tp->t_inpcb->inp_socket;
+ int32_t pending = 0;
+
+ /*
+ * If message delivery is enabled, do not count
+ * unordered bytes in receive buffer towards hiwat mark.
+ * This value is used to return correct rwnd that does
+ * not reflect the extra unordered bytes added to the
+ * receive socket buffer.
+ */
+ if (so->so_flags & SOF_ENABLE_MSGS)
+ rcvbuf = rcvbuf - so->so_msg_state->msg_uno_bytes;
+
+ tcp_sbrcv_grow_rwin(tp, sb);
+
+ space = ((int32_t) imin((rcvbuf - sb->sb_cc),
+ (sb->sb_mbmax - sb->sb_mbcnt)));
+ if (space < 0)
+ space = 0;
+
+#if CONTENT_FILTER
+ /* Compensate for data being processed by content filters */
+ pending = cfil_sock_data_space(sb);
+#endif /* CONTENT_FILTER */
+ if (pending > space)
+ space = 0;
+ else
+ space -= pending;
+
+ /* Avoid increasing window size if the current window
+ * is already very low, we could be in "persist" mode and
+ * we could break some apps (see rdar://5409343)
+ */
+
+ if (space < tp->t_maxseg)
+ return space;
+
+ /* Clip window size for slower link */
+
+ if (((tp->t_flags & TF_SLOWLINK) != 0) && slowlink_wsize > 0 )
+ return imin(space, slowlink_wsize);
+
+ return space;
+}
+/*
+ * Checks TCP Segment Offloading capability for a given connection
+ * and interface pair.
+ */
+void
+tcp_set_tso(struct tcpcb *tp, struct ifnet *ifp)
+{
+#if INET6
+ struct inpcb *inp;
+ int isipv6;
+#endif /* INET6 */
+#if MPTCP
+ /*
+ * We can't use TSO if this tcpcb belongs to an MPTCP session.
+ */
+ if (tp->t_mpflags & TMPF_MPTCP_TRUE) {
+ tp->t_flags &= ~TF_TSO;
+ return;
+ }
+#endif
+#if INET6
+ inp = tp->t_inpcb;
+ isipv6 = (inp->inp_vflag & INP_IPV6) != 0;
+
+ if (isipv6) {
+ if (ifp && (ifp->if_hwassist & IFNET_TSO_IPV6)) {
+ tp->t_flags |= TF_TSO;
+ if (ifp->if_tso_v6_mtu != 0)
+ tp->tso_max_segment_size = ifp->if_tso_v6_mtu;
+ else
+ tp->tso_max_segment_size = TCP_MAXWIN;
+ } else
+ tp->t_flags &= ~TF_TSO;
+
+ } else
+#endif /* INET6 */
+
+ {
+ if (ifp && (ifp->if_hwassist & IFNET_TSO_IPV4)) {
+ tp->t_flags |= TF_TSO;
+ if (ifp->if_tso_v4_mtu != 0)
+ tp->tso_max_segment_size = ifp->if_tso_v4_mtu;
+ else
+ tp->tso_max_segment_size = TCP_MAXWIN;
+ } else
+ tp->t_flags &= ~TF_TSO;
+ }
+}
+
+#define TIMEVAL_TO_TCPHZ(_tv_) ((_tv_).tv_sec * TCP_RETRANSHZ + (_tv_).tv_usec / TCP_RETRANSHZ_TO_USEC)
+
+/* Function to calculate the tcp clock. The tcp clock will get updated
+ * at the boundaries of the tcp layer. This is done at 3 places:
+ * 1. Right before processing an input tcp packet
+ * 2. Whenever a connection wants to access the network using tcp_usrreqs
+ * 3. When a tcp timer fires or before tcp slow timeout
+ *
+ */
+
+void
+calculate_tcp_clock()
+{
+ struct timeval tv = tcp_uptime;
+ struct timeval interval = {0, TCP_RETRANSHZ_TO_USEC};
+ struct timeval now, hold_now;
+ uint32_t incr = 0;
+
+ microuptime(&now);
+
+ /*
+ * Update coarse-grained networking timestamp (in sec.); the idea
+ * is to update the counter returnable via net_uptime() when
+ * we read time.
+ */
+ net_update_uptime_secs(now.tv_sec);
+
+ timevaladd(&tv, &interval);
+ if (timevalcmp(&now, &tv, >)) {
+ /* time to update the clock */
+ lck_spin_lock(tcp_uptime_lock);
+ if (timevalcmp(&tcp_uptime, &now, >=)) {
+ /* clock got updated while waiting for the lock */
+ lck_spin_unlock(tcp_uptime_lock);
+ return;
+ }
+
+ microuptime(&now);
+ hold_now = now;
+ tv = tcp_uptime;
+ timevalsub(&now, &tv);
+
+ incr = TIMEVAL_TO_TCPHZ(now);
+ if (incr > 0) {
+ tcp_uptime = hold_now;
+ tcp_now += incr;
+ }
+
+ lck_spin_unlock(tcp_uptime_lock);
+ }
+ return;
+}
+
+/* Compute receive window scaling that we are going to request
+ * for this connection based on sb_hiwat. Try to leave some
+ * room to potentially increase the window size upto a maximum
+ * defined by the constant tcp_autorcvbuf_max.
+ */
+void
+tcp_set_max_rwinscale(struct tcpcb *tp, struct socket *so) {
+ u_int32_t maxsockbufsize;
+ if (!tcp_do_rfc1323) {
+ tp->request_r_scale = 0;
+ return;
+ }
+
+ tp->request_r_scale = max(tcp_win_scale, tp->request_r_scale);
+ maxsockbufsize = ((so->so_rcv.sb_flags & SB_USRSIZE) != 0) ?
+ so->so_rcv.sb_hiwat : tcp_autorcvbuf_max;
+
+ while (tp->request_r_scale < TCP_MAX_WINSHIFT &&
+ (TCP_MAXWIN << tp->request_r_scale) < maxsockbufsize)
+ tp->request_r_scale++;
+ tp->request_r_scale = min(tp->request_r_scale, TCP_MAX_WINSHIFT);
+
+}
+
+int
+tcp_notsent_lowat_check(struct socket *so) {
+ struct inpcb *inp = sotoinpcb(so);
+ struct tcpcb *tp = NULL;
+ int notsent = 0;
+ if (inp != NULL) {
+ tp = intotcpcb(inp);
+ }
+
+ notsent = so->so_snd.sb_cc -
+ (tp->snd_nxt - tp->snd_una);
+
+ /* When we send a FIN or SYN, not_sent can be negative.
+ * In that case also we need to send a write event to the
+ * process if it is waiting. In the FIN case, it will
+ * get an error from send because cantsendmore will be set.
+ */
+ if (notsent <= tp->t_notsent_lowat) {
+ return(1);
+ }
+
+ /* When Nagle's algorithm is not disabled, it is better
+ * to wakeup the client until there is atleast one
+ * maxseg of data to write.
+ */
+ if ((tp->t_flags & TF_NODELAY) == 0 &&
+ notsent > 0 && notsent < tp->t_maxseg) {
+ return(1);
+ }
+ return(0);
+}
+
+void
+tcp_rxtseg_insert(struct tcpcb *tp, tcp_seq start, tcp_seq end) {
+ struct tcp_rxt_seg *rxseg = NULL, *prev = NULL, *next = NULL;
+ u_int32_t rxcount = 0;
+
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ tp->t_dsack_lastuna = tp->snd_una;
+ /*
+ * First check if there is a segment already existing for this
+ * sequence space.
+ */
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (SEQ_GT(rxseg->rx_start, start))
+ break;
+ prev = rxseg;
+ }
+ next = rxseg;
+
+ /* check if prev seg is for this sequence */
+ if (prev != NULL && SEQ_LEQ(prev->rx_start, start) &&
+ SEQ_GEQ(prev->rx_end, end)) {
+ prev->rx_count++;
+ return;
+ }
+
+ /*
+ * There are a couple of possibilities at this point.
+ * 1. prev overlaps with the beginning of this sequence
+ * 2. next overlaps with the end of this sequence
+ * 3. there is no overlap.
+ */
+
+ if (prev != NULL && SEQ_GT(prev->rx_end, start)) {
+ if (prev->rx_start == start && SEQ_GT(end, prev->rx_end)) {
+ start = prev->rx_end + 1;
+ prev->rx_count++;
+ } else {
+ prev->rx_end = (start - 1);
+ rxcount = prev->rx_count;
+ }
+ }
+
+ if (next != NULL && SEQ_LT(next->rx_start, end)) {
+ if (SEQ_LEQ(next->rx_end, end)) {
+ end = next->rx_start - 1;
+ next->rx_count++;
+ } else {
+ next->rx_start = end + 1;
+ rxcount = next->rx_count;
+ }
+ }
+ if (!SEQ_LT(start, end))
+ return;
+
+ rxseg = (struct tcp_rxt_seg *) zalloc(tcp_rxt_seg_zone);
+ if (rxseg == NULL) {
+ return;
+ }
+ bzero(rxseg, sizeof(*rxseg));
+ rxseg->rx_start = start;
+ rxseg->rx_end = end;
+ rxseg->rx_count = rxcount + 1;
+
+ if (prev != NULL) {
+ SLIST_INSERT_AFTER(prev, rxseg, rx_link);
+ } else {
+ SLIST_INSERT_HEAD(&tp->t_rxt_segments, rxseg, rx_link);
+ }
+ return;
+}
+
+struct tcp_rxt_seg *
+tcp_rxtseg_find(struct tcpcb *tp, tcp_seq start, tcp_seq end)
+{
+ struct tcp_rxt_seg *rxseg;
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ return (NULL);
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (SEQ_LEQ(rxseg->rx_start, start) &&
+ SEQ_GEQ(rxseg->rx_end, end))
+ return (rxseg);
+ if (SEQ_GT(rxseg->rx_start, start))
+ break;
+ }
+ return (NULL);
+}
+
+void
+tcp_rxtseg_clean(struct tcpcb *tp)
+{
+ struct tcp_rxt_seg *rxseg, *next;
+
+ SLIST_FOREACH_SAFE(rxseg, &tp->t_rxt_segments, rx_link, next) {
+ SLIST_REMOVE(&tp->t_rxt_segments, rxseg,
+ tcp_rxt_seg, rx_link);
+ zfree(tcp_rxt_seg_zone, rxseg);
+ }
+ tp->t_dsack_lastuna = tp->snd_max;
+}
+
+boolean_t
+tcp_rxtseg_detect_bad_rexmt(struct tcpcb *tp, tcp_seq th_ack)
+{
+ boolean_t bad_rexmt;
+ struct tcp_rxt_seg *rxseg;
+
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ return (FALSE);
+
+ /*
+ * If all of the segments in this window are not cumulatively
+ * acknowledged, then there can still be undetected packet loss.
+ * Do not restore congestion window in that case.
+ */
+ if (SEQ_LT(th_ack, tp->snd_recover))
+ return (FALSE);
+
+ bad_rexmt = TRUE;
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (rxseg->rx_count > 1 ||
+ !(rxseg->rx_flags & TCP_RXT_SPURIOUS)) {
+ bad_rexmt = FALSE;
+ break;
+ }
+ }
+ return (bad_rexmt);
+}
+
+boolean_t
+tcp_rxtseg_dsack_for_tlp(struct tcpcb *tp)
+{
+ boolean_t dsack_for_tlp = FALSE;
+ struct tcp_rxt_seg *rxseg;
+ if (SLIST_EMPTY(&tp->t_rxt_segments))
+ return (FALSE);
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ if (rxseg->rx_count == 1 &&
+ SLIST_NEXT(rxseg,rx_link) == NULL &&
+ (rxseg->rx_flags & TCP_RXT_DSACK_FOR_TLP)) {
+ dsack_for_tlp = TRUE;
+ break;
+ }
+ }
+ return (dsack_for_tlp);
+}
+
+u_int32_t
+tcp_rxtseg_total_size(struct tcpcb *tp) {
+ struct tcp_rxt_seg *rxseg;
+ u_int32_t total_size = 0;
+
+ SLIST_FOREACH(rxseg, &tp->t_rxt_segments, rx_link) {
+ total_size += (rxseg->rx_end - rxseg->rx_start) + 1;
+ }
+ return (total_size);
+}
+
+void
+tcp_get_connectivity_status(struct tcpcb *tp,
+ struct tcp_conn_status *connstatus)
+{
+ if (tp == NULL || connstatus == NULL)
+ return;
+ bzero(connstatus, sizeof(*connstatus));
+ if (tp->t_rxtshift >= TCP_CONNECTIVITY_PROBES_MAX) {
+ if (TCPS_HAVEESTABLISHED(tp->t_state)) {
+ connstatus->write_probe_failed = 1;
+ } else {
+ connstatus->conn_probe_failed = 1;
+ }
+ }
+ if (tp->t_rtimo_probes >= TCP_CONNECTIVITY_PROBES_MAX)
+ connstatus->read_probe_failed = 1;
+ if (tp->t_inpcb != NULL && tp->t_inpcb->inp_last_outifp != NULL
+ && (tp->t_inpcb->inp_last_outifp->if_eflags & IFEF_PROBE_CONNECTIVITY))
+ connstatus->probe_activated = 1;
+ return;
+}
+
+boolean_t
+tfo_enabled(const struct tcpcb *tp)
+{
+ return !!(tp->t_flagsext & TF_FASTOPEN);
+}
+
+void
+tcp_disable_tfo(struct tcpcb *tp)
+{
+ tp->t_flagsext &= ~TF_FASTOPEN;
+}
+
projects / apple / xnu.git / blobdiff