+/*
+ * Copyright (c) 2008 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
/* $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/kernel.h>
#include <sys/syslog.h>
#include <kern/queue.h>
+#include <kern/locks.h>
#include <net/if.h>
#include <net/route.h>
*/
#define IN6_IFSTAT_STRICT
-static void frag6_enq __P((struct ip6asfrag *, struct ip6asfrag *));
-static void frag6_deq __P((struct ip6asfrag *));
-static void frag6_insque __P((struct ip6q *, struct ip6q *));
-static void frag6_remque __P((struct ip6q *));
-static void frag6_freef __P((struct ip6q *));
+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 *);
/* 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.
*/
struct timeval tv;
ip6_maxfragpackets = nmbclusters / 32;
+ ip6_maxfrags = nmbclusters / 4;
/*
* in many cases, random() here does NOT return random number
*/
/*
* 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)
int first_frag = 0;
int fragoff, frgpartlen; /* must be larger than u_int16_t */
struct ifnet *dstifp;
+ struct ifaddr *ifa = NULL;
#ifdef IN6_IFSTAT_STRICT
- static struct route_in6 ro;
+ struct route_in6 ro;
struct sockaddr_in6 *dst;
#endif
ip6 = mtod(m, struct ip6_hdr *);
#ifndef PULLDOWN_TEST
- IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), IPPROTO_DONE);
+ IP6_EXTHDR_CHECK(m, offset, sizeof(struct ip6_frag), return IPPROTO_DONE);
ip6f = (struct ip6_frag *)((caddr_t)ip6 + offset);
#else
IP6_EXTHDR_GET(ip6f, struct ip6_frag *, m, offset, sizeof(*ip6f));
dstifp = NULL;
#ifdef IN6_IFSTAT_STRICT
/* find the destination interface of the packet. */
+ bzero(&ro, sizeof (ro));
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))) {
+ 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) {
+ RT_LOCK(ro.ro_rt);
+ if ((ifa = ro.ro_rt->rt_ifa) != NULL) {
+ ifaref(ifa);
+ dstifp = ((struct in6_ifaddr *)ro.ro_rt->rt_ifa)->ia_ifp;
+ }
+ RT_UNLOCK(ro.ro_rt);
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;
+ ro.ro_rt = NULL;
}
- 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 (ip6->ip6_plen == 0) {
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER, offset);
in6_ifstat_inc(dstifp, ifs6_reass_fail);
+ if (ifa != NULL)
+ ifafree(ifa);
return IPPROTO_DONE;
}
ICMP6_PARAMPROB_HEADER,
offsetof(struct ip6_hdr, ip6_plen));
in6_ifstat_inc(dstifp, ifs6_reass_fail);
+ if (ifa != NULL)
+ ifafree(ifa);
return IPPROTO_DONE;
}
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.
+ */
+ if (ip6_maxfrags < 0)
+ ;
+ else if (frag6_nfrags >= (u_int)ip6_maxfrags)
+ goto dropfrag;
+
for (q6 = ip6q.ip6q_next; q6 != &ip6q; q6 = q6->ip6q_next)
if (ip6f->ip6f_ident == q6->ip6q_ident &&
IN6_ARE_ADDR_EQUAL(&ip6->ip6_src, &q6->ip6q_src) &&
q6->ip6q_src = ip6->ip6_src;
q6->ip6q_dst = ip6->ip6_dst;
q6->ip6q_unfrglen = -1; /* The 1st fragment has not arrived. */
+
+ q6->ip6q_nfrag = 0;
}
/*
offset - sizeof(struct ip6_frag) +
offsetof(struct ip6_frag, ip6f_offlg));
frag6_doing_reass = 0;
+ if (ifa != NULL)
+ ifafree(ifa);
return(IPPROTO_DONE);
}
}
offset - sizeof(struct ip6_frag) +
offsetof(struct ip6_frag, ip6f_offlg));
frag6_doing_reass = 0;
+ if (ifa != NULL)
+ ifafree(ifa);
return(IPPROTO_DONE);
}
/*
* the most recently active fragmented packet.
*/
frag6_enq(ip6af, af6->ip6af_up);
+ frag6_nfrags++;
+ q6->ip6q_nfrag++;
#if 0 /* xxx */
if (q6 != ip6q.ip6q_next) {
frag6_remque(q6);
af6 = af6->ip6af_down) {
if (af6->ip6af_off != next) {
frag6_doing_reass = 0;
+ if (ifa != NULL)
+ ifafree(ifa);
return IPPROTO_DONE;
}
next += af6->ip6af_frglen;
}
if (af6->ip6af_up->ip6af_mff) {
frag6_doing_reass = 0;
+ if (ifa != NULL)
+ ifafree(ifa);
return IPPROTO_DONE;
}
/* 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--;
goto dropfrag;
}
frag6_remque(q6);
+ frag6_nfrags -= q6->ip6q_nfrag;
FREE(q6, M_FTABLE);
frag6_nfragpackets--;
*offp = offset;
frag6_doing_reass = 0;
+ if (ifa != NULL)
+ ifafree(ifa);
return nxt;
dropfrag:
ip6stat.ip6s_fragdropped++;
m_freem(m);
frag6_doing_reass = 0;
+ if (ifa != NULL)
+ ifafree(ifa);
return IPPROTO_DONE;
}
/* restoure 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
}
frag6_remque(q6);
+ frag6_nfrags -= q6->ip6q_nfrag;
FREE(q6, M_FTABLE);
frag6_nfragpackets--;
}
frag6_slowtimo()
{
struct ip6q *q6;
- int s = splnet();
+ lck_mtx_lock(inet6_domain_mutex);
frag6_doing_reass = 1;
q6 = ip6q.ip6q_next;
frag6_freef(ip6q.ip6q_prev);
}
frag6_doing_reass = 0;
-
-#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
-
- splx(s);
+ lck_mtx_unlock(inet6_domain_mutex);
}
/*
{
if (frag6_doing_reass)
return;
+ lck_mtx_lock(inet6_domain_mutex);
while (ip6q.ip6q_next != &ip6q) {
ip6stat.ip6s_fragdropped++;
/* XXX in6_ifstat_inc(ifp, ifs6_reass_fail) */
frag6_freef(ip6q.ip6q_next);
}
+ lck_mtx_unlock(inet6_domain_mutex);
}
projects / apple / xnu.git / blobdiff