+/*
+ * Copyright (c) 2000-2013 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@
+ */
+
/* $FreeBSD: src/sys/netinet6/frag6.c,v 1.2.2.5 2001/07/03 11:01:50 ume Exp $ */
/* $KAME: frag6.c,v 1.31 2001/05/17 13:45:34 jinmei Exp $ */
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
+#include <sys/mcache.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
+#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#include <net/net_osdep.h>
+#include <dev/random/randomdev.h>
/*
* Define it to get a correct behavior on per-interface statistics.
- * You will need to perform an extra routing table lookup, per fragment,
- * to do it. This may, or may not be, a performance hit.
*/
#define IN6_IFSTAT_STRICT
+MBUFQ_HEAD(fq6_head);
+
+static void frag6_save_context(struct mbuf *, int);
+static void frag6_scrub_context(struct mbuf *);
+static int frag6_restore_context(struct mbuf *);
+
+static void frag6_icmp6_paramprob_error(struct fq6_head *);
+static void frag6_icmp6_timeex_error(struct fq6_head *);
+
static void frag6_enq(struct ip6asfrag *, struct ip6asfrag *);
static void frag6_deq(struct ip6asfrag *);
static void frag6_insque(struct ip6q *, struct ip6q *);
static void frag6_remque(struct ip6q *);
-static void frag6_freef(struct ip6q *);
+static void frag6_freef(struct ip6q *, struct fq6_head *, struct fq6_head *);
+
+static int frag6_timeout_run; /* frag6 timer is scheduled to run */
+static void frag6_timeout(void *);
+static void frag6_sched_timeout(void);
+
+static struct ip6q *ip6q_alloc(int);
+static void ip6q_free(struct ip6q *);
+static void ip6q_updateparams(void);
+static struct ip6asfrag *ip6af_alloc(int);
+static void ip6af_free(struct ip6asfrag *);
+
+decl_lck_mtx_data(static, ip6qlock);
+static lck_attr_t *ip6qlock_attr;
+static lck_grp_t *ip6qlock_grp;
+static lck_grp_attr_t *ip6qlock_grp_attr;
+
+/* IPv6 fragment reassembly queues (protected by ip6qlock) */
+static struct ip6q ip6q; /* ip6 reassembly queues */
+static int ip6_maxfragpackets; /* max packets in reass queues */
+static u_int32_t frag6_nfragpackets; /* # of packets in reass queues */
+static int ip6_maxfrags; /* max fragments in reass queues */
+static u_int32_t frag6_nfrags; /* # of fragments in reass queues */
+static u_int32_t ip6q_limit; /* ip6q allocation limit */
+static u_int32_t ip6q_count; /* current # of allocated ip6q's */
+static u_int32_t ip6af_limit; /* ip6asfrag allocation limit */
+static u_int32_t ip6af_count; /* current # of allocated ip6asfrag's */
+
+static int sysctl_maxfragpackets SYSCTL_HANDLER_ARGS;
+static int sysctl_maxfrags SYSCTL_HANDLER_ARGS;
+
+SYSCTL_DECL(_net_inet6_ip6);
+
+SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_MAXFRAGPACKETS, maxfragpackets,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_maxfragpackets, 0,
+ sysctl_maxfragpackets, "I",
+ "Maximum number of IPv6 fragment reassembly queue entries");
+
+SYSCTL_UINT(_net_inet6_ip6, OID_AUTO, fragpackets,
+ CTLFLAG_RD | CTLFLAG_LOCKED, &frag6_nfragpackets, 0,
+ "Current number of IPv6 fragment reassembly queue entries");
+
+SYSCTL_PROC(_net_inet6_ip6, IPV6CTL_MAXFRAGS, maxfrags,
+ CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_LOCKED, &ip6_maxfrags, 0,
+ sysctl_maxfrags, "I", "Maximum number of IPv6 fragments allowed");
-/* XXX we eventually need splreass6, or some real semaphore */
-int frag6_doing_reass;
-u_int frag6_nfragpackets;
-static u_int frag6_nfrags;
-struct ip6q ip6q; /* ip6 reassemble queue */
-
-#ifndef __APPLE__
-MALLOC_DEFINE(M_FTABLE, "fragment", "fragment reassembly header");
-#endif
-
-extern lck_mtx_t *inet6_domain_mutex;
/*
* Initialise reassembly queue and fragment identifier.
*/
void
-frag6_init()
+frag6_init(void)
{
- struct timeval tv;
+ /* ip6q_alloc() uses mbufs for IPv6 fragment queue structures */
+ _CASSERT(sizeof (struct ip6q) <= _MLEN);
+ /* ip6af_alloc() uses mbufs for IPv6 fragment queue structures */
+ _CASSERT(sizeof (struct ip6asfrag) <= _MLEN);
+
+ /* IPv6 fragment reassembly queue lock */
+ ip6qlock_grp_attr = lck_grp_attr_alloc_init();
+ ip6qlock_grp = lck_grp_alloc_init("ip6qlock", ip6qlock_grp_attr);
+ ip6qlock_attr = lck_attr_alloc_init();
+ lck_mtx_init(&ip6qlock, ip6qlock_grp, ip6qlock_attr);
+
+ lck_mtx_lock(&ip6qlock);
+ /* Initialize IPv6 reassembly queue. */
+ ip6q.ip6q_next = ip6q.ip6q_prev = &ip6q;
+ /* same limits as IPv4 */
ip6_maxfragpackets = nmbclusters / 32;
- ip6_maxfrags = nmbclusters / 4;
+ ip6_maxfrags = ip6_maxfragpackets * 2;
+ ip6q_updateparams();
+ lck_mtx_unlock(&ip6qlock);
+}
- /*
- * in many cases, random() here does NOT return random number
- * as initialization during bootstrap time occur in fixed order.
- */
- microtime(&tv);
- ip6_id = random() ^ tv.tv_usec;
- ip6q.ip6q_next = ip6q.ip6q_prev = &ip6q;
+static void
+frag6_save_context(struct mbuf *m, int val)
+{
+ m->m_pkthdr.pkt_hdr = (void *)(uintptr_t)val;
+}
+
+static void
+frag6_scrub_context(struct mbuf *m)
+{
+ m->m_pkthdr.pkt_hdr = NULL;
+}
+
+static int
+frag6_restore_context(struct mbuf *m)
+{
+ return ((int)m->m_pkthdr.pkt_hdr);
+}
+
+/*
+ * Send any deferred ICMP param problem error messages; caller must not be
+ * holding ip6qlock and is expected to have saved the per-packet parameter
+ * value via frag6_save_context().
+ */
+static void
+frag6_icmp6_paramprob_error(struct fq6_head *diq6)
+{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_NOTOWNED);
+
+ if (!MBUFQ_EMPTY(diq6)) {
+ struct mbuf *merr, *merr_tmp;
+ int param;
+ MBUFQ_FOREACH_SAFE(merr, diq6, merr_tmp) {
+ MBUFQ_REMOVE(diq6, merr);
+ MBUFQ_NEXT(merr) = NULL;
+ param = frag6_restore_context(merr);
+ frag6_scrub_context(merr);
+ icmp6_error(merr, ICMP6_PARAM_PROB,
+ ICMP6_PARAMPROB_HEADER, param);
+ }
+ }
+}
+
+/*
+ * Send any deferred ICMP time exceeded error messages;
+ * caller must not be holding ip6qlock.
+ */
+static void
+frag6_icmp6_timeex_error(struct fq6_head *diq6)
+{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_NOTOWNED);
+
+ if (!MBUFQ_EMPTY(diq6)) {
+ struct mbuf *m, *m_tmp;
+ MBUFQ_FOREACH_SAFE(m, diq6, m_tmp) {
+ MBUFQ_REMOVE(diq6, m);
+ MBUFQ_NEXT(m) = NULL;
+ icmp6_error(m, ICMP6_TIME_EXCEEDED,
+ ICMP6_TIME_EXCEED_REASSEMBLY, 0);
+ }
+ }
}
/*
*/
/*
* Fragment input
- * NOTE: this function is called with the inet6_domain_mutex held from ip6_input.
- * inet6_domain_mutex is protecting he frag6 queue manipulation.
*/
int
-frag6_input(mp, offp)
- struct mbuf **mp;
- int *offp;
+frag6_input(struct mbuf **mp, int *offp, int proto)
{
+#pragma unused(proto)
struct mbuf *m = *mp, *t;
struct ip6_hdr *ip6;
struct ip6_frag *ip6f;
int offset = *offp, nxt, i, next;
int first_frag = 0;
int fragoff, frgpartlen; /* must be larger than u_int16_t */
- struct ifnet *dstifp;
-#ifdef IN6_IFSTAT_STRICT
- static struct route_in6 ro;
- struct sockaddr_in6 *dst;
-#endif
+ struct ifnet *dstifp = NULL;
+ u_int8_t ecn, ecn0;
+ uint32_t csum, csum_flags;
+ struct fq6_head diq6;
+ int locked = 0;
+
+ VERIFY(m->m_flags & M_PKTHDR);
+
+ MBUFQ_INIT(&diq6); /* for deferred ICMP param problem errors */
+
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
ip6 = mtod(m, struct ip6_hdr *);
#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), return IPPROTO_DONE);
+ IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), goto done);
ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset);
#else
IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f));
if (ip6f == NULL)
- return IPPROTO_DONE;
+ goto done;
#endif
- dstifp = NULL;
#ifdef IN6_IFSTAT_STRICT
/* find the destination interface of the packet. */
- dst = (struct sockaddr_in6 *)&ro.ro_dst;
- if (ro.ro_rt
- && ((ro.ro_rt->rt_flags & RTF_UP) == 0
- || !IN6_ARE_ADDR_EQUAL(&dst->sin6_addr, &ip6->ip6_dst))) {
- rtfree(ro.ro_rt);
- ro.ro_rt = (struct rtentry *)0;
- }
- if (ro.ro_rt == NULL) {
- bzero(dst, sizeof(*dst));
- dst->sin6_family = AF_INET6;
- dst->sin6_len = sizeof(struct sockaddr_in6);
- dst->sin6_addr = ip6->ip6_dst;
- }
- rtalloc((struct route *)&ro);
- if (ro.ro_rt != NULL && ro.ro_rt->rt_ifa != NULL)
- dstifp = ((struct in6_ifaddr *)ro.ro_rt->rt_ifa)->ia_ifp;
-#else
- /* we are violating the spec, this is not the destination interface */
- if ((m->m_flags & M_PKTHDR) != 0)
+ if (m->m_pkthdr.pkt_flags & PKTF_IFAINFO) {
+ uint32_t idx;
+
+ if (ip6_getdstifaddr_info(m, &idx, NULL) == 0) {
+ if (idx > 0 && idx <= if_index) {
+ ifnet_head_lock_shared();
+ dstifp = ifindex2ifnet[idx];
+ ifnet_head_done();
+ }
+ }
+ }
+#endif /* IN6_IFSTAT_STRICT */
+
+ /* we are violating the spec, this may not be the dst interface */
+ if (dstifp == NULL)
dstifp = m->m_pkthdr.rcvif;
-#endif
/* jumbo payload can't contain a fragment header */
if (ip6->ip6_plen == 0) {
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset);
in6_ifstat_inc(dstifp, ifs6_reass_fail);
- return IPPROTO_DONE;
+ m = NULL;
+ goto done;
}
/*
*/
if ((ip6f->ip6f_offlg & IP6F_MORE_FRAG) &&
(((ntohs(ip6->ip6_plen) - offset) & 0x7) != 0)) {
- icmp6_error(m, ICMP6_PARAM_PROB,
- ICMP6_PARAMPROB_HEADER,
- offsetof(struct ip6_hdr, ip6_plen));
+ icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
+ offsetof(struct ip6_hdr, ip6_plen));
in6_ifstat_inc(dstifp, ifs6_reass_fail);
- return IPPROTO_DONE;
+ m = NULL;
+ goto done;
+ }
+
+ /* If ip6_maxfragpackets or ip6_maxfrags is 0, never accept fragments */
+ if (ip6_maxfragpackets == 0 || ip6_maxfrags == 0) {
+ ip6stat.ip6s_fragments++;
+ ip6stat.ip6s_fragdropped++;
+ in6_ifstat_inc(dstifp, ifs6_reass_fail);
+ m_freem(m);
+ m = NULL;
+ goto done;
}
- ip6stat.ip6s_fragments++;
- in6_ifstat_inc(dstifp, ifs6_reass_reqd);
-
/* offset now points to data portion */
offset += sizeof(struct ip6_frag);
- frag6_doing_reass = 1;
-
/*
- * Enforce upper bound on number of fragments.
- * If maxfrag is 0, never accept fragments.
- * If maxfrag is -1, accept all fragments without limitation.
+ * Leverage partial checksum offload for simple UDP/IP fragments,
+ * as that is the most common case.
+ *
+ * Perform 1's complement adjustment of octets that got included/
+ * excluded in the hardware-calculated checksum value.
*/
- if (ip6_maxfrags < 0)
- ;
- else if (frag6_nfrags >= (u_int)ip6_maxfrags)
- goto dropfrag;
+ if (ip6f->ip6f_nxt == IPPROTO_UDP &&
+ offset == (sizeof (*ip6) + sizeof (*ip6f)) &&
+ (m->m_pkthdr.csum_flags &
+ (CSUM_DATA_VALID | CSUM_PARTIAL | CSUM_PSEUDO_HDR)) ==
+ (CSUM_DATA_VALID | CSUM_PARTIAL)) {
+ uint32_t start;
+
+ start = m->m_pkthdr.csum_rx_start;
+ csum = m->m_pkthdr.csum_rx_val;
+
+ if (start != offset) {
+ uint16_t s, d;
+
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
+ s = ip6->ip6_src.s6_addr16[1];
+ ip6->ip6_src.s6_addr16[1] = 0 ;
+ }
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
+ d = ip6->ip6_dst.s6_addr16[1];
+ ip6->ip6_dst.s6_addr16[1] = 0;
+ }
+
+ /* callee folds in sum */
+ csum = m_adj_sum16(m, start, offset, csum);
+
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src))
+ ip6->ip6_src.s6_addr16[1] = s;
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst))
+ ip6->ip6_dst.s6_addr16[1] = d;
+
+ }
+ csum_flags = m->m_pkthdr.csum_flags;
+ } else {
+ csum = 0;
+ csum_flags = 0;
+ }
+
+ /* Invalidate checksum */
+ m->m_pkthdr.csum_flags &= ~CSUM_DATA_VALID;
+
+ ip6stat.ip6s_fragments++;
+ in6_ifstat_inc(dstifp, ifs6_reass_reqd);
+
+ lck_mtx_lock(&ip6qlock);
+ locked = 1;
for (q6 = ip6q.ip6q_next; q6 != &ip6q; q6 = q6->ip6q_next)
if (ip6f->ip6f_ident == q6->ip6q_ident &&
*/
first_frag = 1;
- /*
- * Enforce upper bound on number of fragmented packets
- * for which we attempt reassembly;
- * If maxfrag is 0, never accept fragments.
- * If maxfrag is -1, accept all fragments without limitation.
- */
- if (ip6_maxfragpackets < 0)
- ;
- else if (frag6_nfragpackets >= (u_int)ip6_maxfragpackets)
- goto dropfrag;
- frag6_nfragpackets++;
- q6 = (struct ip6q *)_MALLOC(sizeof(struct ip6q), M_FTABLE,
- M_DONTWAIT);
+ q6 = ip6q_alloc(M_DONTWAIT);
if (q6 == NULL)
goto dropfrag;
- bzero(q6, sizeof(*q6));
frag6_insque(q6, &ip6q);
+ frag6_nfragpackets++;
/* ip6q_nxt will be filled afterwards, from 1st fragment */
q6->ip6q_down = q6->ip6q_up = (struct ip6asfrag *)q6;
q6->ip6q_nxtp = (u_char *)nxtp;
#endif
q6->ip6q_ident = ip6f->ip6f_ident;
- q6->ip6q_arrive = 0; /* Is it used anywhere? */
- q6->ip6q_ttl = IPV6_FRAGTTL;
+ q6->ip6q_ttl = IPV6_FRAGTTL;
q6->ip6q_src = ip6->ip6_src;
q6->ip6q_dst = ip6->ip6_dst;
+ q6->ip6q_ecn =
+ (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK;
q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */
- q6->ip6q_nfrag = 0;
+ q6->ip6q_nfrag = 0;
+
+ /*
+ * If the first fragment has valid checksum offload
+ * info, the rest of fragments are eligible as well.
+ */
+ if (csum_flags != 0) {
+ q6->ip6q_csum = csum;
+ q6->ip6q_csum_flags = csum_flags;
+ }
}
/*
*/
fragoff = ntohs(ip6f->ip6f_offlg & IP6F_OFF_MASK);
if (fragoff == 0) {
- q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr)
- - sizeof(struct ip6_frag);
+ q6->ip6q_unfrglen = offset - sizeof(struct ip6_hdr) -
+ sizeof(struct ip6_frag);
q6->ip6q_nxt = ip6f->ip6f_nxt;
}
if (q6->ip6q_unfrglen >= 0) {
/* The 1st fragment has already arrived. */
if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) {
+ lck_mtx_unlock(&ip6qlock);
+ locked = 0;
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
- offset - sizeof(struct ip6_frag) +
- offsetof(struct ip6_frag, ip6f_offlg));
- frag6_doing_reass = 0;
- return(IPPROTO_DONE);
+ offset - sizeof(struct ip6_frag) +
+ offsetof(struct ip6_frag, ip6f_offlg));
+ m = NULL;
+ goto done;
}
- }
- else if (fragoff + frgpartlen > IPV6_MAXPACKET) {
+ } else if (fragoff + frgpartlen > IPV6_MAXPACKET) {
+ lck_mtx_unlock(&ip6qlock);
+ locked = 0;
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
- offset - sizeof(struct ip6_frag) +
- offsetof(struct ip6_frag, ip6f_offlg));
- frag6_doing_reass = 0;
- return(IPPROTO_DONE);
+ offset - sizeof(struct ip6_frag) +
+ offsetof(struct ip6_frag, ip6f_offlg));
+ m = NULL;
+ goto done;
}
/*
* If it's the first fragment, do the above check for each
/* dequeue the fragment. */
frag6_deq(af6);
- FREE(af6, M_FTABLE);
+ ip6af_free(af6);
/* adjust pointer. */
ip6err = mtod(merr, struct ip6_hdr *);
ip6err->ip6_src = q6->ip6q_src;
ip6err->ip6_dst = q6->ip6q_dst;
- icmp6_error(merr, ICMP6_PARAM_PROB,
- ICMP6_PARAMPROB_HEADER,
- erroff - sizeof(struct ip6_frag) +
- offsetof(struct ip6_frag, ip6f_offlg));
+ frag6_save_context(merr,
+ erroff - sizeof (struct ip6_frag) +
+ offsetof(struct ip6_frag, ip6f_offlg));
+
+ MBUFQ_ENQUEUE(&diq6, merr);
}
}
}
- ip6af = (struct ip6asfrag *)_MALLOC(sizeof(struct ip6asfrag), M_FTABLE,
- M_DONTWAIT);
+ ip6af = ip6af_alloc(M_DONTWAIT);
if (ip6af == NULL)
goto dropfrag;
- bzero(ip6af, sizeof(*ip6af));
- ip6af->ip6af_head = ip6->ip6_flow;
- ip6af->ip6af_len = ip6->ip6_plen;
- ip6af->ip6af_nxt = ip6->ip6_nxt;
- ip6af->ip6af_hlim = ip6->ip6_hlim;
+
ip6af->ip6af_mff = ip6f->ip6f_offlg & IP6F_MORE_FRAG;
ip6af->ip6af_off = fragoff;
ip6af->ip6af_frglen = frgpartlen;
goto insert;
}
+ /*
+ * Handle ECN by comparing this segment with the first one;
+ * if CE is set, do not lose CE.
+ * drop if CE and not-ECT are mixed for the same packet.
+ */
+ ecn = (ntohl(ip6->ip6_flow) >> 20) & IPTOS_ECN_MASK;
+ ecn0 = q6->ip6q_ecn;
+ if (ecn == IPTOS_ECN_CE) {
+ if (ecn0 == IPTOS_ECN_NOTECT) {
+ ip6af_free(ip6af);
+ goto dropfrag;
+ }
+ if (ecn0 != IPTOS_ECN_CE)
+ q6->ip6q_ecn = IPTOS_ECN_CE;
+ }
+ if (ecn == IPTOS_ECN_NOTECT && ecn0 != IPTOS_ECN_NOTECT) {
+ ip6af_free(ip6af);
+ goto dropfrag;
+ }
+
/*
* Find a segment which begins after this one does.
*/
* If there is a preceding segment, it may provide some of
* our data already. If so, drop the data from the incoming
* segment. If it provides all of our data, drop us.
+ *
+ * If some of the data is dropped from the preceding
+ * segment, then it's checksum is invalidated.
*/
if (af6->ip6af_up != (struct ip6asfrag *)q6) {
i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen
if (i >= ip6af->ip6af_frglen)
goto dropfrag;
m_adj(IP6_REASS_MBUF(ip6af), i);
+ q6->ip6q_csum_flags = 0;
ip6af->ip6af_off += i;
ip6af->ip6af_frglen -= i;
}
af6->ip6af_frglen -= i;
af6->ip6af_off += i;
m_adj(IP6_REASS_MBUF(af6), i);
+ q6->ip6q_csum_flags = 0;
break;
}
af6 = af6->ip6af_down;
* If the incoming framgent overlaps some existing fragments in
* the reassembly queue, drop it, since it is dangerous to override
* existing fragments from a security point of view.
+ * We don't know which fragment is the bad guy - here we trust
+ * fragment that came in earlier, with no real reason.
+ *
+ * Note: due to changes after disabling this part, mbuf passed to
+ * m_adj() below now does not meet the requirement.
*/
if (af6->ip6af_up != (struct ip6asfrag *)q6) {
i = af6->ip6af_up->ip6af_off + af6->ip6af_up->ip6af_frglen
"overlaps the previous fragment\n",
i, ip6_sprintf(&q6->ip6q_src));
#endif
- FREE(ip6af, M_FTABLE);
+ ip6af_free(ip6af);
goto dropfrag;
}
}
"overlaps the succeeding fragment",
i, ip6_sprintf(&q6->ip6q_src));
#endif
- FREE(ip6af, M_FTABLE);
+ ip6af_free(ip6af);
goto dropfrag;
}
}
#endif
+ /*
+ * If this fragment contains similar checksum offload info
+ * as that of the existing ones, accumulate checksum. Otherwise,
+ * invalidate checksum offload info for the entire datagram.
+ */
+ if (csum_flags != 0 && csum_flags == q6->ip6q_csum_flags)
+ q6->ip6q_csum += csum;
+ else if (q6->ip6q_csum_flags != 0)
+ q6->ip6q_csum_flags = 0;
+
insert:
/*
for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6;
af6 = af6->ip6af_down) {
if (af6->ip6af_off != next) {
- frag6_doing_reass = 0;
- return IPPROTO_DONE;
+ lck_mtx_unlock(&ip6qlock);
+ locked = 0;
+ m = NULL;
+ goto done;
}
next += af6->ip6af_frglen;
}
if (af6->ip6af_up->ip6af_mff) {
- frag6_doing_reass = 0;
- return IPPROTO_DONE;
+ lck_mtx_unlock(&ip6qlock);
+ locked = 0;
+ m = NULL;
+ goto done;
}
/*
t = t->m_next;
t->m_next = IP6_REASS_MBUF(af6);
m_adj(t->m_next, af6->ip6af_offset);
- FREE(af6, M_FTABLE);
+ ip6af_free(af6);
af6 = af6dwn;
}
+ /*
+ * Store partial hardware checksum info from the fragment queue;
+ * the receive start offset is set to 40 bytes (see code at the
+ * top of this routine.)
+ */
+ if (q6->ip6q_csum_flags != 0) {
+ csum = q6->ip6q_csum;
+
+ ADDCARRY(csum);
+
+ m->m_pkthdr.csum_rx_val = csum;
+ m->m_pkthdr.csum_rx_start = sizeof (struct ip6_hdr);
+ m->m_pkthdr.csum_flags = q6->ip6q_csum_flags;
+ } else if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) ||
+ (m->m_pkthdr.pkt_flags & PKTF_LOOP)) {
+ /* loopback checksums are always OK */
+ m->m_pkthdr.csum_data = 0xffff;
+ m->m_pkthdr.csum_flags &= ~CSUM_PARTIAL;
+ m->m_pkthdr.csum_flags = CSUM_DATA_VALID | CSUM_PSEUDO_HDR;
+ }
+
/* adjust offset to point where the original next header starts */
offset = ip6af->ip6af_offset - sizeof(struct ip6_frag);
- FREE(ip6af, M_FTABLE);
+ ip6af_free(ip6af);
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_plen = htons((u_short)next + offset - sizeof(struct ip6_hdr));
ip6->ip6_src = q6->ip6q_src;
ip6->ip6_dst = q6->ip6q_dst;
+ if (q6->ip6q_ecn == IPTOS_ECN_CE)
+ ip6->ip6_flow |= htonl(IPTOS_ECN_CE << 20);
+
nxt = q6->ip6q_nxt;
-#if notyet
+#ifdef notyet
*q6->ip6q_nxtp = (u_char)(nxt & 0xff);
#endif
- /*
- * Delete frag6 header with as a few cost as possible.
- */
- if (offset < m->m_len) {
+ /* Delete frag6 header */
+ if (m->m_len >= offset + sizeof(struct ip6_frag)) {
+ /* This is the only possible case with !PULLDOWN_TEST */
ovbcopy((caddr_t)ip6, (caddr_t)ip6 + sizeof(struct ip6_frag),
- offset);
+ offset);
m->m_data += sizeof(struct ip6_frag);
m->m_len -= sizeof(struct ip6_frag);
} else {
/* this comes with no copy if the boundary is on cluster */
if ((t = m_split(m, offset, M_DONTWAIT)) == NULL) {
frag6_remque(q6);
- frag6_nfrags -= q6->ip6q_nfrag;
- FREE(q6, M_FTABLE);
frag6_nfragpackets--;
+ frag6_nfrags -= q6->ip6q_nfrag;
+ ip6q_free(q6);
goto dropfrag;
}
m_adj(t, sizeof(struct ip6_frag));
}
frag6_remque(q6);
- frag6_nfrags -= q6->ip6q_nfrag;
- FREE(q6, M_FTABLE);
frag6_nfragpackets--;
+ frag6_nfrags -= q6->ip6q_nfrag;
+ ip6q_free(q6);
+
+ if (m->m_flags & M_PKTHDR) /* Isn't it always true? */
+ m_fixhdr(m);
- if (m->m_flags & M_PKTHDR) { /* Isn't it always true? */
- int plen = 0;
- for (t = m; t; t = t->m_next)
- plen += t->m_len;
- m->m_pkthdr.len = plen;
- }
-
ip6stat.ip6s_reassembled++;
- in6_ifstat_inc(dstifp, ifs6_reass_ok);
/*
* Tell launch routine the next header
*/
-
*mp = m;
*offp = offset;
- frag6_doing_reass = 0;
- return nxt;
-
- dropfrag:
- in6_ifstat_inc(dstifp, ifs6_reass_fail);
+ /* arm the purge timer if not already and if there's work to do */
+ frag6_sched_timeout();
+ lck_mtx_unlock(&ip6qlock);
+ in6_ifstat_inc(dstifp, ifs6_reass_ok);
+ frag6_icmp6_paramprob_error(&diq6);
+ VERIFY(MBUFQ_EMPTY(&diq6));
+ return (nxt);
+
+done:
+ VERIFY(m == NULL);
+ if (!locked) {
+ if (frag6_nfragpackets == 0) {
+ frag6_icmp6_paramprob_error(&diq6);
+ VERIFY(MBUFQ_EMPTY(&diq6));
+ return (IPPROTO_DONE);
+ }
+ lck_mtx_lock(&ip6qlock);
+ }
+ /* arm the purge timer if not already and if there's work to do */
+ frag6_sched_timeout();
+ lck_mtx_unlock(&ip6qlock);
+ frag6_icmp6_paramprob_error(&diq6);
+ VERIFY(MBUFQ_EMPTY(&diq6));
+ return (IPPROTO_DONE);
+
+dropfrag:
ip6stat.ip6s_fragdropped++;
+ /* arm the purge timer if not already and if there's work to do */
+ frag6_sched_timeout();
+ lck_mtx_unlock(&ip6qlock);
+ in6_ifstat_inc(dstifp, ifs6_reass_fail);
m_freem(m);
- frag6_doing_reass = 0;
- return IPPROTO_DONE;
+ frag6_icmp6_paramprob_error(&diq6);
+ VERIFY(MBUFQ_EMPTY(&diq6));
+ return (IPPROTO_DONE);
}
/*
* associated datagrams.
*/
void
-frag6_freef(q6)
- struct ip6q *q6;
+frag6_freef(struct ip6q *q6, struct fq6_head *dfq6, struct fq6_head *diq6)
{
struct ip6asfrag *af6, *down6;
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_OWNED);
+
for (af6 = q6->ip6q_down; af6 != (struct ip6asfrag *)q6;
af6 = down6) {
struct mbuf *m = IP6_REASS_MBUF(af6);
/* adjust pointer */
ip6 = mtod(m, struct ip6_hdr *);
- /* restoure source and destination addresses */
+ /* restore source and destination addresses */
ip6->ip6_src = q6->ip6q_src;
ip6->ip6_dst = q6->ip6q_dst;
- icmp6_error(m, ICMP6_TIME_EXCEEDED,
- ICMP6_TIME_EXCEED_REASSEMBLY, 0);
- } else
- m_freem(m);
- FREE(af6, M_FTABLE);
+
+ MBUFQ_ENQUEUE(diq6, m);
+ } else {
+ MBUFQ_ENQUEUE(dfq6, m);
+ }
+ ip6af_free(af6);
}
frag6_remque(q6);
- frag6_nfrags -= q6->ip6q_nfrag;
- FREE(q6, M_FTABLE);
frag6_nfragpackets--;
+ frag6_nfrags -= q6->ip6q_nfrag;
+ ip6q_free(q6);
}
/*
* Like insque, but pointers in middle of structure.
*/
void
-frag6_enq(af6, up6)
- struct ip6asfrag *af6, *up6;
+frag6_enq(struct ip6asfrag *af6, struct ip6asfrag *up6)
{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_OWNED);
+
af6->ip6af_up = up6;
af6->ip6af_down = up6->ip6af_down;
up6->ip6af_down->ip6af_up = af6;
* To frag6_enq as remque is to insque.
*/
void
-frag6_deq(af6)
- struct ip6asfrag *af6;
+frag6_deq(struct ip6asfrag *af6)
{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_OWNED);
+
af6->ip6af_up->ip6af_down = af6->ip6af_down;
af6->ip6af_down->ip6af_up = af6->ip6af_up;
}
void
-frag6_insque(new, old)
- struct ip6q *new, *old;
+frag6_insque(struct ip6q *new, struct ip6q *old)
{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_OWNED);
+
new->ip6q_prev = old;
new->ip6q_next = old->ip6q_next;
old->ip6q_next->ip6q_prev= new;
}
void
-frag6_remque(p6)
- struct ip6q *p6;
+frag6_remque(struct ip6q *p6)
{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_OWNED);
+
p6->ip6q_prev->ip6q_next = p6->ip6q_next;
p6->ip6q_next->ip6q_prev = p6->ip6q_prev;
}
* if a timer expires on a reassembly
* queue, discard it.
*/
-void
-frag6_slowtimo()
+static void
+frag6_timeout(void *arg)
{
+#pragma unused(arg)
+ struct fq6_head dfq6, diq6;
struct ip6q *q6;
- lck_mtx_lock(inet6_domain_mutex);
- frag6_doing_reass = 1;
+ MBUFQ_INIT(&dfq6); /* for deferred frees */
+ MBUFQ_INIT(&diq6); /* for deferred ICMP time exceeded errors */
+
+ /*
+ * Update coarse-grained networking timestamp (in sec.); the idea
+ * is to piggy-back on the timeout callout to update the counter
+ * returnable via net_uptime().
+ */
+ net_update_uptime();
+
+ lck_mtx_lock(&ip6qlock);
q6 = ip6q.ip6q_next;
if (q6)
while (q6 != &ip6q) {
if (q6->ip6q_prev->ip6q_ttl == 0) {
ip6stat.ip6s_fragtimeout++;
/* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */
- frag6_freef(q6->ip6q_prev);
+ frag6_freef(q6->ip6q_prev, &dfq6, &diq6);
}
}
/*
* (due to the limit being lowered), drain off
* enough to get down to the new limit.
*/
- while (frag6_nfragpackets > (u_int)ip6_maxfragpackets &&
- ip6q.ip6q_prev) {
- ip6stat.ip6s_fragoverflow++;
- /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */
- frag6_freef(ip6q.ip6q_prev);
+ if (ip6_maxfragpackets >= 0) {
+ while (frag6_nfragpackets > (unsigned)ip6_maxfragpackets &&
+ ip6q.ip6q_prev) {
+ ip6stat.ip6s_fragoverflow++;
+ /* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */
+ frag6_freef(ip6q.ip6q_prev, &dfq6, &diq6);
+ }
}
- frag6_doing_reass = 0;
+ /* re-arm the purge timer if there's work to do */
+ frag6_timeout_run = 0;
+ frag6_sched_timeout();
+ lck_mtx_unlock(&ip6qlock);
-#if 0
- /*
- * Routing changes might produce a better route than we last used;
- * make sure we notice eventually, even if forwarding only for one
- * destination and the cache is never replaced.
- */
- if (ip6_forward_rt.ro_rt) {
- rtfree(ip6_forward_rt.ro_rt);
- ip6_forward_rt.ro_rt = 0;
- }
- if (ipsrcchk_rt.ro_rt) {
- rtfree(ipsrcchk_rt.ro_rt);
- ipsrcchk_rt.ro_rt = 0;
- }
-#endif
+ /* free fragments that need to be freed */
+ if (!MBUFQ_EMPTY(&dfq6))
+ MBUFQ_DRAIN(&dfq6);
- lck_mtx_unlock(inet6_domain_mutex);
+ frag6_icmp6_timeex_error(&diq6);
+
+ VERIFY(MBUFQ_EMPTY(&dfq6));
+ VERIFY(MBUFQ_EMPTY(&diq6));
+}
+
+static void
+frag6_sched_timeout(void)
+{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_OWNED);
+
+ if (!frag6_timeout_run && frag6_nfragpackets > 0) {
+ frag6_timeout_run = 1;
+ timeout(frag6_timeout, NULL, hz);
+ }
}
/*
* Drain off all datagram fragments.
*/
void
-frag6_drain()
+frag6_drain(void)
{
- if (frag6_doing_reass)
- return;
- lck_mtx_lock(inet6_domain_mutex);
+ struct fq6_head dfq6, diq6;
+
+ MBUFQ_INIT(&dfq6); /* for deferred frees */
+ MBUFQ_INIT(&diq6); /* for deferred ICMP time exceeded errors */
+
+ lck_mtx_lock(&ip6qlock);
while (ip6q.ip6q_next != &ip6q) {
ip6stat.ip6s_fragdropped++;
/* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */
- frag6_freef(ip6q.ip6q_next);
+ frag6_freef(ip6q.ip6q_next, &dfq6, &diq6);
+ }
+ lck_mtx_unlock(&ip6qlock);
+
+ /* free fragments that need to be freed */
+ if (!MBUFQ_EMPTY(&dfq6))
+ MBUFQ_DRAIN(&dfq6);
+
+ frag6_icmp6_timeex_error(&diq6);
+
+ VERIFY(MBUFQ_EMPTY(&dfq6));
+ VERIFY(MBUFQ_EMPTY(&diq6));
+}
+
+static struct ip6q *
+ip6q_alloc(int how)
+{
+ struct mbuf *t;
+ struct ip6q *q6;
+
+ /*
+ * See comments in ip6q_updateparams(). Keep the count separate
+ * from frag6_nfragpackets since the latter represents the elements
+ * already in the reassembly queues.
+ */
+ if (ip6q_limit > 0 && ip6q_count > ip6q_limit)
+ return (NULL);
+
+ t = m_get(how, MT_FTABLE);
+ if (t != NULL) {
+ atomic_add_32(&ip6q_count, 1);
+ q6 = mtod(t, struct ip6q *);
+ bzero(q6, sizeof (*q6));
+ } else {
+ q6 = NULL;
+ }
+ return (q6);
+}
+
+static void
+ip6q_free(struct ip6q *q6)
+{
+ (void) m_free(dtom(q6));
+ atomic_add_32(&ip6q_count, -1);
+}
+
+static struct ip6asfrag *
+ip6af_alloc(int how)
+{
+ struct mbuf *t;
+ struct ip6asfrag *af6;
+
+ /*
+ * See comments in ip6q_updateparams(). Keep the count separate
+ * from frag6_nfrags since the latter represents the elements
+ * already in the reassembly queues.
+ */
+ if (ip6af_limit > 0 && ip6af_count > ip6af_limit)
+ return (NULL);
+
+ t = m_get(how, MT_FTABLE);
+ if (t != NULL) {
+ atomic_add_32(&ip6af_count, 1);
+ af6 = mtod(t, struct ip6asfrag *);
+ bzero(af6, sizeof (*af6));
+ } else {
+ af6 = NULL;
+ }
+ return (af6);
+}
+
+static void
+ip6af_free(struct ip6asfrag *af6)
+{
+ (void) m_free(dtom(af6));
+ atomic_add_32(&ip6af_count, -1);
+}
+
+static void
+ip6q_updateparams(void)
+{
+ lck_mtx_assert(&ip6qlock, LCK_MTX_ASSERT_OWNED);
+ /*
+ * -1 for unlimited allocation.
+ */
+ if (ip6_maxfragpackets < 0)
+ ip6q_limit = 0;
+ if (ip6_maxfrags < 0)
+ ip6af_limit = 0;
+ /*
+ * Positive number for specific bound.
+ */
+ if (ip6_maxfragpackets > 0)
+ ip6q_limit = ip6_maxfragpackets;
+ if (ip6_maxfrags > 0)
+ ip6af_limit = ip6_maxfrags;
+ /*
+ * Zero specifies no further fragment queue allocation -- set the
+ * bound very low, but rely on implementation elsewhere to actually
+ * prevent allocation and reclaim current queues.
+ */
+ if (ip6_maxfragpackets == 0)
+ ip6q_limit = 1;
+ if (ip6_maxfrags == 0)
+ ip6af_limit = 1;
+ /*
+ * Arm the purge timer if not already and if there's work to do
+ */
+ frag6_sched_timeout();
+}
+
+static int
+sysctl_maxfragpackets SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error, i;
+
+ lck_mtx_lock(&ip6qlock);
+ i = ip6_maxfragpackets;
+ error = sysctl_handle_int(oidp, &i, 0, req);
+ if (error || req->newptr == USER_ADDR_NULL)
+ goto done;
+ /* impose bounds */
+ if (i < -1 || i > (nmbclusters / 4)) {
+ error = EINVAL;
+ goto done;
+ }
+ ip6_maxfragpackets = i;
+ ip6q_updateparams();
+done:
+ lck_mtx_unlock(&ip6qlock);
+ return (error);
+}
+
+static int
+sysctl_maxfrags SYSCTL_HANDLER_ARGS
+{
+#pragma unused(arg1, arg2)
+ int error, i;
+
+ lck_mtx_lock(&ip6qlock);
+ i = ip6_maxfrags;
+ error = sysctl_handle_int(oidp, &i, 0, req);
+ if (error || req->newptr == USER_ADDR_NULL)
+ goto done;
+ /* impose bounds */
+ if (i < -1 || i > (nmbclusters / 4)) {
+ error = EINVAL;
+ goto done;
}
- lck_mtx_unlock(inet6_domain_mutex);
+ ip6_maxfrags= i;
+ ip6q_updateparams(); /* see if we need to arm timer */
+done:
+ lck_mtx_unlock(&ip6qlock);
+ return (error);
}
projects / apple / xnu.git / blobdiff