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NetBSD/sys/netinet6/ip6_input.c

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/* $NetBSD: ip6_input.c,v 1.128 2009/09/16 15:23:05 pooka Exp $ */
/* $KAME: ip6_input.c,v 1.188 2001/03/29 05:34:31 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/*
* Copyright (c) 1982, 1986, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)ip_input.c 8.2 (Berkeley) 1/4/94
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ip6_input.c,v 1.128 2009/09/16 15:23:05 pooka Exp $");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.h"
#include "opt_pfil_hooks.h"
#include "opt_compat_netbsd.h"
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/domain.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <sys/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <sys/proc.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/if_types.h>
#include <net/if_dl.h>
#include <net/route.h>
#include <net/netisr.h>
#ifdef PFIL_HOOKS
#include <net/pfil.h>
#endif
#include <netinet/in.h>
#include <netinet/in_systm.h>
#ifdef INET
#include <netinet/ip.h>
#include <netinet/ip_icmp.h>
#endif /* INET */
#include <netinet/ip6.h>
#include <netinet6/in6_var.h>
#include <netinet6/ip6_var.h>
#include <netinet6/ip6_private.h>
#include <netinet6/in6_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/scope6_var.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/nd6.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#include <netinet6/ipsec_private.h>
#endif
#ifdef FAST_IPSEC
#include <netipsec/ipsec.h>
#include <netipsec/ipsec6.h>
#include <netipsec/key.h>
#endif /* FAST_IPSEC */
#ifdef COMPAT_50
#include <compat/sys/time.h>
#include <compat/sys/socket.h>
#endif
#include <netinet6/ip6protosw.h>
#include "faith.h"
#include "gif.h"
#if NGIF > 0
#include <netinet6/in6_gif.h>
#endif
#include <net/net_osdep.h>
extern struct domain inet6domain;
u_char ip6_protox[IPPROTO_MAX];
static int ip6qmaxlen = IFQ_MAXLEN;
struct in6_ifaddr *in6_ifaddr;
struct ifqueue ip6intrq;
extern callout_t in6_tmpaddrtimer_ch;
int ip6_forward_srcrt; /* XXX */
int ip6_sourcecheck; /* XXX */
int ip6_sourcecheck_interval; /* XXX */
#ifdef PFIL_HOOKS
struct pfil_head inet6_pfil_hook;
#endif
percpu_t *ip6stat_percpu;
static void ip6_init2(void *);
static struct m_tag *ip6_setdstifaddr(struct mbuf *, const struct in6_ifaddr *);
static int ip6_hopopts_input(u_int32_t *, u_int32_t *, struct mbuf **, int *);
static struct mbuf *ip6_pullexthdr(struct mbuf *, size_t, int);
static void sysctl_net_inet6_ip6_setup(struct sysctllog **);
/*
* IP6 initialization: fill in IP6 protocol switch table.
* All protocols not implemented in kernel go to raw IP6 protocol handler.
*/
void
ip6_init(void)
{
const struct ip6protosw *pr;
int i;
sysctl_net_inet6_ip6_setup(NULL);
pr = (const struct ip6protosw *)pffindproto(PF_INET6, IPPROTO_RAW, SOCK_RAW);
if (pr == 0)
panic("ip6_init");
for (i = 0; i < IPPROTO_MAX; i++)
ip6_protox[i] = pr - inet6sw;
for (pr = (const struct ip6protosw *)inet6domain.dom_protosw;
pr < (const struct ip6protosw *)inet6domain.dom_protoswNPROTOSW; pr++)
if (pr->pr_domain->dom_family == PF_INET6 &&
pr->pr_protocol && pr->pr_protocol != IPPROTO_RAW)
ip6_protox[pr->pr_protocol] = pr - inet6sw;
ip6intrq.ifq_maxlen = ip6qmaxlen;
scope6_init();
addrsel_policy_init();
nd6_init();
frag6_init();
ip6_desync_factor = arc4random() % MAX_TEMP_DESYNC_FACTOR;
ip6_init2((void *)0);
#ifdef GATEWAY
ip6flow_init(ip6_hashsize);
#endif
#ifdef PFIL_HOOKS
/* Register our Packet Filter hook. */
inet6_pfil_hook.ph_type = PFIL_TYPE_AF;
inet6_pfil_hook.ph_af = AF_INET6;
i = pfil_head_register(&inet6_pfil_hook);
if (i != 0)
printf("ip6_init: WARNING: unable to register pfil hook, "
"error %d\n", i);
#endif /* PFIL_HOOKS */
ip6stat_percpu = percpu_alloc(sizeof(uint64_t) * IP6_NSTATS);
}
static void
ip6_init2(void *dummy)
{
/* nd6_timer_init */
callout_init(&nd6_timer_ch, CALLOUT_MPSAFE);
callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
/* timer for regeneranation of temporary addresses randomize ID */
callout_init(&in6_tmpaddrtimer_ch, CALLOUT_MPSAFE);
callout_reset(&in6_tmpaddrtimer_ch,
(ip6_temp_preferred_lifetime - ip6_desync_factor -
ip6_temp_regen_advance) * hz,
in6_tmpaddrtimer, NULL);
}
/*
* IP6 input interrupt handling. Just pass the packet to ip6_input.
*/
void
ip6intr(void)
{
int s;
struct mbuf *m;
mutex_enter(softnet_lock);
KERNEL_LOCK(1, NULL);
for (;;) {
s = splnet();
IF_DEQUEUE(&ip6intrq, m);
splx(s);
if (m == 0)
break;
/* drop the packet if IPv6 operation is disabled on the IF */
if ((ND_IFINFO(m->m_pkthdr.rcvif)->flags & ND6_IFF_IFDISABLED)) {
m_freem(m);
break;
}
ip6_input(m);
}
KERNEL_UNLOCK_ONE(NULL);
mutex_exit(softnet_lock);
}
extern struct route ip6_forward_rt;
void
ip6_input(struct mbuf *m)
{
struct ip6_hdr *ip6;
int hit, off = sizeof(struct ip6_hdr), nest;
u_int32_t plen;
u_int32_t rtalert = ~0;
int nxt, ours = 0, rh_present = 0;
struct ifnet *deliverifp = NULL;
int srcrt = 0;
const struct rtentry *rt;
union {
struct sockaddr dst;
struct sockaddr_in6 dst6;
} u;
#ifdef FAST_IPSEC
struct m_tag *mtag;
struct tdb_ident *tdbi;
struct secpolicy *sp;
int s, error;
#endif
#ifdef IPSEC
/*
* should the inner packet be considered authentic?
* see comment in ah4_input().
*/
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
#endif
/*
* make sure we don't have onion peering information into m_tag.
*/
ip6_delaux(m);
/*
* mbuf statistics
*/
if (m->m_flags & M_EXT) {
if (m->m_next)
IP6_STATINC(IP6_STAT_MEXT2M);
else
IP6_STATINC(IP6_STAT_MEXT1);
} else {
#define M2MMAX 32
if (m->m_next) {
if (m->m_flags & M_LOOP) {
/*XXX*/ IP6_STATINC(IP6_STAT_M2M + lo0ifp->if_index);
} else if (m->m_pkthdr.rcvif->if_index < M2MMAX) {
IP6_STATINC(IP6_STAT_M2M +
m->m_pkthdr.rcvif->if_index);
} else
IP6_STATINC(IP6_STAT_M2M);
} else
IP6_STATINC(IP6_STAT_M1);
#undef M2MMAX
}
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
IP6_STATINC(IP6_STAT_TOTAL);
/*
* If the IPv6 header is not aligned, slurp it up into a new
* mbuf with space for link headers, in the event we forward
* it. Otherwise, if it is aligned, make sure the entire base
* IPv6 header is in the first mbuf of the chain.
*/
if (IP6_HDR_ALIGNED_P(mtod(m, void *)) == 0) {
struct ifnet *inifp = m->m_pkthdr.rcvif;
if ((m = m_copyup(m, sizeof(struct ip6_hdr),
(max_linkhdr + 3) & ~3)) == NULL) {
/* XXXJRT new stat, please */
IP6_STATINC(IP6_STAT_TOOSMALL);
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
return;
}
} else if (__predict_false(m->m_len < sizeof(struct ip6_hdr))) {
struct ifnet *inifp = m->m_pkthdr.rcvif;
if ((m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
IP6_STATINC(IP6_STAT_TOOSMALL);
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
return;
}
}
ip6 = mtod(m, struct ip6_hdr *);
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
IP6_STATINC(IP6_STAT_BADVERS);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
goto bad;
}
#if defined(IPSEC)
/* IPv6 fast forwarding is not compatible with IPsec. */
m->m_flags &= ~M_CANFASTFWD;
#else
/*
* Assume that we can create a fast-forward IP flow entry
* based on this packet.
*/
m->m_flags |= M_CANFASTFWD;
#endif
#ifdef PFIL_HOOKS
/*
* Run through list of hooks for input packets. If there are any
* filters which require that additional packets in the flow are
* not fast-forwarded, they must clear the M_CANFASTFWD flag.
* Note that filters must _never_ set this flag, as another filter
* in the list may have previously cleared it.
*/
/*
* let ipfilter look at packet on the wire,
* not the decapsulated packet.
*/
#ifdef IPSEC
if (!ipsec_getnhist(m))
#elif defined(FAST_IPSEC)
if (!ipsec_indone(m))
#else
if (1)
#endif
{
struct in6_addr odst;
odst = ip6->ip6_dst;
if (pfil_run_hooks(&inet6_pfil_hook, &m, m->m_pkthdr.rcvif,
PFIL_IN) != 0)
return;
if (m == NULL)
return;
ip6 = mtod(m, struct ip6_hdr *);
srcrt = !IN6_ARE_ADDR_EQUAL(&odst, &ip6->ip6_dst);
}
#endif /* PFIL_HOOKS */
IP6_STATINC(IP6_STAT_NXTHIST + ip6->ip6_nxt);
#ifdef ALTQ
if (altq_input != NULL && (*altq_input)(m, AF_INET6) == 0) {
/* packet is dropped by traffic conditioner */
return;
}
#endif
/*
* Check against address spoofing/corruption.
*/
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_src) ||
IN6_IS_ADDR_UNSPECIFIED(&ip6->ip6_dst)) {
/*
* XXX: "badscope" is not very suitable for a multicast source.
*/
IP6_STATINC(IP6_STAT_BADSCOPE);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
/*
* The following check is not documented in specs. A malicious
* party may be able to use IPv4 mapped addr to confuse tcp/udp stack
* and bypass security checks (act as if it was from 127.0.0.1 by using
* IPv6 src ::ffff:127.0.0.1). Be cautious.
*
* This check chokes if we are in an SIIT cloud. As none of BSDs
* support IPv4-less kernel compilation, we cannot support SIIT
* environment at all. So, it makes more sense for us to reject any
* malicious packets for non-SIIT environment, than try to do a
* partial support for SIIT environment.
*/
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
IP6_STATINC(IP6_STAT_BADSCOPE);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
#if 0
/*
* Reject packets with IPv4 compatible addresses (auto tunnel).
*
* The code forbids auto tunnel relay case in RFC1933 (the check is
* stronger than RFC1933). We may want to re-enable it if mech-xx
* is revised to forbid relaying case.
*/
if (IN6_IS_ADDR_V4COMPAT(&ip6->ip6_src) ||
IN6_IS_ADDR_V4COMPAT(&ip6->ip6_dst)) {
IP6_STATINC(IP6_STAT_BADSCOPE);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
#endif
/*
* Disambiguate address scope zones (if there is ambiguity).
* We first make sure that the original source or destination address
* is not in our internal form for scoped addresses. Such addresses
* are not necessarily invalid spec-wise, but we cannot accept them due
* to the usage conflict.
* in6_setscope() then also checks and rejects the cases where src or
* dst are the loopback address and the receiving interface
* is not loopback.
*/
if (__predict_false(
m_makewritable(&m, 0, sizeof(struct ip6_hdr), M_DONTWAIT)))
goto bad;
ip6 = mtod(m, struct ip6_hdr *);
if (in6_clearscope(&ip6->ip6_src) || in6_clearscope(&ip6->ip6_dst)) {
IP6_STATINC(IP6_STAT_BADSCOPE); /* XXX */
goto bad;
}
if (in6_setscope(&ip6->ip6_src, m->m_pkthdr.rcvif, NULL) ||
in6_setscope(&ip6->ip6_dst, m->m_pkthdr.rcvif, NULL)) {
IP6_STATINC(IP6_STAT_BADSCOPE);
goto bad;
}
/*
* Multicast check
*/
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
struct in6_multi *in6m = 0;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_mcast);
/*
* See if we belong to the destination multicast group on the
* arrival interface.
*/
IN6_LOOKUP_MULTI(ip6->ip6_dst, m->m_pkthdr.rcvif, in6m);
if (in6m)
ours = 1;
else if (!ip6_mrouter) {
uint64_t *ip6s = IP6_STAT_GETREF();
ip6s[IP6_STAT_NOTMEMBER]++;
ip6s[IP6_STAT_CANTFORWARD]++;
IP6_STAT_PUTREF();
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
goto bad;
}
deliverifp = m->m_pkthdr.rcvif;
goto hbhcheck;
}
sockaddr_in6_init(&u.dst6, &ip6->ip6_dst, 0, 0, 0);
/*
* Unicast check
*/
rt = rtcache_lookup2(&ip6_forward_rt, &u.dst, 1, &hit);
if (hit)
IP6_STATINC(IP6_STAT_FORWARD_CACHEHIT);
else
IP6_STATINC(IP6_STAT_FORWARD_CACHEMISS);
#define rt6_getkey(__rt) satocsin6(rt_getkey(__rt))
/*
* Accept the packet if the forwarding interface to the destination
* according to the routing table is the loopback interface,
* unless the associated route has a gateway.
* Note that this approach causes to accept a packet if there is a
* route to the loopback interface for the destination of the packet.
* But we think it's even useful in some situations, e.g. when using
* a special daemon which wants to intercept the packet.
*/
if (rt != NULL &&
(rt->rt_flags & (RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
!(rt->rt_flags & RTF_CLONED) &&
#if 0
/*
* The check below is redundant since the comparison of
* the destination and the key of the rtentry has
* already done through looking up the routing table.
*/
IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &rt6_getkey(rt)->sin6_addr) &&
#endif
rt->rt_ifp->if_type == IFT_LOOP) {
struct in6_ifaddr *ia6 = (struct in6_ifaddr *)rt->rt_ifa;
if (ia6->ia6_flags & IN6_IFF_ANYCAST)
m->m_flags |= M_ANYCAST6;
/*
* packets to a tentative, duplicated, or somehow invalid
* address must not be accepted.
*/
if (!(ia6->ia6_flags & IN6_IFF_NOTREADY)) {
/* this address is ready */
ours = 1;
deliverifp = ia6->ia_ifp; /* correct? */
goto hbhcheck;
} else {
/* address is not ready, so discard the packet. */
nd6log((LOG_INFO,
"ip6_input: packet to an unready address %s->%s\n",
ip6_sprintf(&ip6->ip6_src),
ip6_sprintf(&ip6->ip6_dst)));
goto bad;
}
}
/*
* FAITH (Firewall Aided Internet Translator)
*/
#if defined(NFAITH) && 0 < NFAITH
if (ip6_keepfaith) {
if (rt != NULL && rt->rt_ifp != NULL &&
rt->rt_ifp->if_type == IFT_FAITH) {
/* XXX do we need more sanity checks? */
ours = 1;
deliverifp = rt->rt_ifp; /* faith */
goto hbhcheck;
}
}
#endif
#if 0
{
/*
* Last resort: check in6_ifaddr for incoming interface.
* The code is here until I update the "goto ours hack" code above
* working right.
*/
struct ifaddr *ifa;
IFADDR_FOREACH(ifa, m->m_pkthdr.rcvif) {
if (ifa->ifa_addr == NULL)
continue; /* just for safety */
if (ifa->ifa_addr->sa_family != AF_INET6)
continue;
if (IN6_ARE_ADDR_EQUAL(IFA_IN6(ifa), &ip6->ip6_dst)) {
ours = 1;
deliverifp = ifa->ifa_ifp;
goto hbhcheck;
}
}
}
#endif
/*
* Now there is no reason to process the packet if it's not our own
* and we're not a router.
*/
if (!ip6_forwarding) {
IP6_STATINC(IP6_STAT_CANTFORWARD);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
goto bad;
}
hbhcheck:
/*
* record address information into m_tag, if we don't have one yet.
* note that we are unable to record it, if the address is not listed
* as our interface address (e.g. multicast addresses, addresses
* within FAITH prefixes and such).
*/
if (deliverifp && ip6_getdstifaddr(m) == NULL) {
struct in6_ifaddr *ia6;
ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
if (ia6 != NULL && ip6_setdstifaddr(m, ia6) == NULL) {
/*
* XXX maybe we should drop the packet here,
* as we could not provide enough information
* to the upper layers.
*/
}
}
/*
* Process Hop-by-Hop options header if it's contained.
* m may be modified in ip6_hopopts_input().
* If a JumboPayload option is included, plen will also be modified.
*/
plen = (u_int32_t)ntohs(ip6->ip6_plen);
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
struct ip6_hbh *hbh;
if (ip6_hopopts_input(&plen, &rtalert, &m, &off)) {
#if 0 /*touches NULL pointer*/
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
#endif
return; /* m have already been freed */
}
/* adjust pointer */
ip6 = mtod(m, struct ip6_hdr *);
/*
* if the payload length field is 0 and the next header field
* indicates Hop-by-Hop Options header, then a Jumbo Payload
* option MUST be included.
*/
if (ip6->ip6_plen == 0 && plen == 0) {
/*
* Note that if a valid jumbo payload option is
* contained, ip6_hopopts_input() must set a valid
* (non-zero) payload length to the variable plen.
*/
IP6_STATINC(IP6_STAT_BADOPTIONS);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
(char *)&ip6->ip6_plen - (char *)ip6);
return;
}
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
sizeof(struct ip6_hbh));
if (hbh == NULL) {
IP6_STATINC(IP6_STAT_TOOSHORT);
return;
}
KASSERT(IP6_HDR_ALIGNED_P(hbh));
nxt = hbh->ip6h_nxt;
/*
* accept the packet if a router alert option is included
* and we act as an IPv6 router.
*/
if (rtalert != ~0 && ip6_forwarding)
ours = 1;
} else
nxt = ip6->ip6_nxt;
/*
* Check that the amount of data in the buffers
* is as at least much as the IPv6 header would have us expect.
* Trim mbufs if longer than we expect.
* Drop packet if shorter than we expect.
*/
if (m->m_pkthdr.len - sizeof(struct ip6_hdr) < plen) {
IP6_STATINC(IP6_STAT_TOOSHORT);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
goto bad;
}
if (m->m_pkthdr.len > sizeof(struct ip6_hdr) + plen) {
if (m->m_len == m->m_pkthdr.len) {
m->m_len = sizeof(struct ip6_hdr) + plen;
m->m_pkthdr.len = sizeof(struct ip6_hdr) + plen;
} else
m_adj(m, sizeof(struct ip6_hdr) + plen - m->m_pkthdr.len);
}
/*
* Forward if desirable.
*/
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
/*
* If we are acting as a multicast router, all
* incoming multicast packets are passed to the
* kernel-level multicast forwarding function.
* The packet is returned (relatively) intact; if
* ip6_mforward() returns a non-zero value, the packet
* must be discarded, else it may be accepted below.
*/
if (ip6_mrouter && ip6_mforward(ip6, m->m_pkthdr.rcvif, m)) {
IP6_STATINC(IP6_STAT_CANTFORWARD);
m_freem(m);
return;
}
if (!ours) {
m_freem(m);
return;
}
} else if (!ours) {
ip6_forward(m, srcrt);
return;
}
ip6 = mtod(m, struct ip6_hdr *);
/*
* Malicious party may be able to use IPv4 mapped addr to confuse
* tcp/udp stack and bypass security checks (act as if it was from
* 127.0.0.1 by using IPv6 src ::ffff:127.0.0.1). Be cautious.
*
* For SIIT end node behavior, you may want to disable the check.
* However, you will become vulnerable to attacks using IPv4 mapped
* source.
*/
if (IN6_IS_ADDR_V4MAPPED(&ip6->ip6_src) ||
IN6_IS_ADDR_V4MAPPED(&ip6->ip6_dst)) {
IP6_STATINC(IP6_STAT_BADSCOPE);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
/*
* Tell launch routine the next header
*/
#ifdef IFA_STATS
if (deliverifp != NULL) {
struct in6_ifaddr *ia6;
ia6 = in6_ifawithifp(deliverifp, &ip6->ip6_dst);
if (ia6)
ia6->ia_ifa.ifa_data.ifad_inbytes += m->m_pkthdr.len;
}
#endif
IP6_STATINC(IP6_STAT_DELIVERED);
in6_ifstat_inc(deliverifp, ifs6_in_deliver);
nest = 0;
rh_present = 0;
while (nxt != IPPROTO_DONE) {
if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
IP6_STATINC(IP6_STAT_TOOMANYHDR);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
goto bad;
}
/*
* protection against faulty packet - there should be
* more sanity checks in header chain processing.
*/
if (m->m_pkthdr.len < off) {
IP6_STATINC(IP6_STAT_TOOSHORT);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
goto bad;
}
if (nxt == IPPROTO_ROUTING) {
if (rh_present++) {
in6_ifstat_inc(m->m_pkthdr.rcvif,
ifs6_in_hdrerr);
IP6_STATINC(IP6_STAT_BADOPTIONS);
goto bad;
}
}
#ifdef IPSEC
/*
* enforce IPsec policy checking if we are seeing last header.
* note that we do not visit this with protocols with pcb layer
* code - like udp/tcp/raw ip.
*/
if ((inet6sw[ip6_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
ipsec6_in_reject(m, NULL)) {
IPSEC6_STATINC(IPSEC_STAT_IN_POLVIO);
goto bad;
}
#endif
#ifdef FAST_IPSEC
/*
* enforce IPsec policy checking if we are seeing last header.
* note that we do not visit this with protocols with pcb layer
* code - like udp/tcp/raw ip.
*/
if ((inet6sw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0) {
/*
* Check if the packet has already had IPsec processing
* done. If so, then just pass it along. This tag gets
* set during AH, ESP, etc. input handling, before the
* packet is returned to the ip input queue for delivery.
*/
mtag = m_tag_find(m, PACKET_TAG_IPSEC_IN_DONE, NULL);
s = splsoftnet();
if (mtag != NULL) {
tdbi = (struct tdb_ident *)(mtag + 1);
sp = ipsec_getpolicy(tdbi, IPSEC_DIR_INBOUND);
} else {
sp = ipsec_getpolicybyaddr(m, IPSEC_DIR_INBOUND,
IP_FORWARDING, &error);
}
if (sp != NULL) {
/*
* Check security policy against packet attributes.
*/
error = ipsec_in_reject(sp, m);
KEY_FREESP(&sp);
} else {
/* XXX error stat??? */
error = EINVAL;
DPRINTF(("ip6_input: no SP, packet discarded\n"));/*XXX*/
}
splx(s);
if (error)
goto bad;
}
#endif /* FAST_IPSEC */
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
}
return;
bad:
m_freem(m);
}
/*
* set/grab in6_ifaddr correspond to IPv6 destination address.
*/
static struct m_tag *
ip6_setdstifaddr(struct mbuf *m, const struct in6_ifaddr *ia)
{
struct m_tag *mtag;
mtag = ip6_addaux(m);
if (mtag != NULL) {
struct ip6aux *ip6a;
ip6a = (struct ip6aux *)(mtag + 1);
in6_setscope(&ip6a->ip6a_src, ia->ia_ifp, &ip6a->ip6a_scope_id);
ip6a->ip6a_src = ia->ia_addr.sin6_addr;
ip6a->ip6a_flags = ia->ia6_flags;
}
return mtag; /* NULL if failed to set */
}
const struct ip6aux *
ip6_getdstifaddr(struct mbuf *m)
{
struct m_tag *mtag;
mtag = ip6_findaux(m);
if (mtag != NULL)
return (struct ip6aux *)(mtag + 1);
else
return NULL;
}
/*
* Hop-by-Hop options header processing. If a valid jumbo payload option is
* included, the real payload length will be stored in plenp.
*
* rtalertp - XXX: should be stored more smart way
*/
static int
ip6_hopopts_input(u_int32_t *plenp, u_int32_t *rtalertp,
struct mbuf **mp, int *offp)
{
struct mbuf *m = *mp;
int off = *offp, hbhlen;
struct ip6_hbh *hbh;
/* validation of the length of the header */
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
if (hbh == NULL) {
IP6_STATINC(IP6_STAT_TOOSHORT);
return -1;
}
hbhlen = (hbh->ip6h_len + 1) << 3;
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
hbhlen);
if (hbh == NULL) {
IP6_STATINC(IP6_STAT_TOOSHORT);
return -1;
}
KASSERT(IP6_HDR_ALIGNED_P(hbh));
off += hbhlen;
hbhlen -= sizeof(struct ip6_hbh);
if (ip6_process_hopopts(m, (u_int8_t *)hbh + sizeof(struct ip6_hbh),
hbhlen, rtalertp, plenp) < 0)
return (-1);
*offp = off;
*mp = m;
return (0);
}
/*
* Search header for all Hop-by-hop options and process each option.
* This function is separate from ip6_hopopts_input() in order to
* handle a case where the sending node itself process its hop-by-hop
* options header. In such a case, the function is called from ip6_output().
*
* The function assumes that hbh header is located right after the IPv6 header
* (RFC2460 p7), opthead is pointer into data content in m, and opthead to
* opthead + hbhlen is located in continuous memory region.
*/
int
ip6_process_hopopts(struct mbuf *m, u_int8_t *opthead, int hbhlen,
u_int32_t *rtalertp, u_int32_t *plenp)
{
struct ip6_hdr *ip6;
int optlen = 0;
u_int8_t *opt = opthead;
u_int16_t rtalert_val;
u_int32_t jumboplen;
const int erroff = sizeof(struct ip6_hdr) + sizeof(struct ip6_hbh);
for (; hbhlen > 0; hbhlen -= optlen, opt += optlen) {
switch (*opt) {
case IP6OPT_PAD1:
optlen = 1;
break;
case IP6OPT_PADN:
if (hbhlen < IP6OPT_MINLEN) {
IP6_STATINC(IP6_STAT_TOOSMALL);
goto bad;
}
optlen = *(opt + 1) + 2;
break;
case IP6OPT_RTALERT:
/* XXX may need check for alignment */
if (hbhlen < IP6OPT_RTALERT_LEN) {
IP6_STATINC(IP6_STAT_TOOSMALL);
goto bad;
}
if (*(opt + 1) != IP6OPT_RTALERT_LEN - 2) {
/* XXX stat */
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 1 - opthead);
return (-1);
}
optlen = IP6OPT_RTALERT_LEN;
memcpy((void *)&rtalert_val, (void *)(opt + 2), 2);
*rtalertp = ntohs(rtalert_val);
break;
case IP6OPT_JUMBO:
/* XXX may need check for alignment */
if (hbhlen < IP6OPT_JUMBO_LEN) {
IP6_STATINC(IP6_STAT_TOOSMALL);
goto bad;
}
if (*(opt + 1) != IP6OPT_JUMBO_LEN - 2) {
/* XXX stat */
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 1 - opthead);
return (-1);
}
optlen = IP6OPT_JUMBO_LEN;
/*
* IPv6 packets that have non 0 payload length
* must not contain a jumbo payload option.
*/
ip6 = mtod(m, struct ip6_hdr *);
if (ip6->ip6_plen) {
IP6_STATINC(IP6_STAT_BADOPTIONS);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt - opthead);
return (-1);
}
/*
* We may see jumbolen in unaligned location, so
* we'd need to perform bcopy().
*/
memcpy(&jumboplen, opt + 2, sizeof(jumboplen));
jumboplen = (u_int32_t)htonl(jumboplen);
#if 1
/*
* if there are multiple jumbo payload options,
* *plenp will be non-zero and the packet will be
* rejected.
* the behavior may need some debate in ipngwg -
* multiple options does not make sense, however,
* there's no explicit mention in specification.
*/
if (*plenp != 0) {
IP6_STATINC(IP6_STAT_BADOPTIONS);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 2 - opthead);
return (-1);
}
#endif
/*
* jumbo payload length must be larger than 65535.
*/
if (jumboplen <= IPV6_MAXPACKET) {
IP6_STATINC(IP6_STAT_BADOPTIONS);
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_HEADER,
erroff + opt + 2 - opthead);
return (-1);
}
*plenp = jumboplen;
break;
default: /* unknown option */
if (hbhlen < IP6OPT_MINLEN) {
IP6_STATINC(IP6_STAT_TOOSMALL);
goto bad;
}
optlen = ip6_unknown_opt(opt, m,
erroff + opt - opthead);
if (optlen == -1)
return (-1);
optlen += 2;
break;
}
}
return (0);
bad:
m_freem(m);
return (-1);
}
/*
* Unknown option processing.
* The third argument `off' is the offset from the IPv6 header to the option,
* which is necessary if the IPv6 header the and option header and IPv6 header
* is not continuous in order to return an ICMPv6 error.
*/
int
ip6_unknown_opt(u_int8_t *optp, struct mbuf *m, int off)
{
struct ip6_hdr *ip6;
switch (IP6OPT_TYPE(*optp)) {
case IP6OPT_TYPE_SKIP: /* ignore the option */
return ((int)*(optp + 1));
case IP6OPT_TYPE_DISCARD: /* silently discard */
m_freem(m);
return (-1);
case IP6OPT_TYPE_FORCEICMP: /* send ICMP even if multicasted */
IP6_STATINC(IP6_STAT_BADOPTIONS);
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
return (-1);
case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
IP6_STATINC(IP6_STAT_BADOPTIONS);
ip6 = mtod(m, struct ip6_hdr *);
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst) ||
(m->m_flags & (M_BCAST|M_MCAST)))
m_freem(m);
else
icmp6_error(m, ICMP6_PARAM_PROB,
ICMP6_PARAMPROB_OPTION, off);
return (-1);
}
m_freem(m); /* XXX: NOTREACHED */
return (-1);
}
/*
* Create the "control" list for this pcb.
*
* The routine will be called from upper layer handlers like tcp6_input().
* Thus the routine assumes that the caller (tcp6_input) have already
* called IP6_EXTHDR_CHECK() and all the extension headers are located in the
* very first mbuf on the mbuf chain.
* We may want to add some infinite loop prevention or sanity checks for safety.
* (This applies only when you are using KAME mbuf chain restriction, i.e.
* you are using IP6_EXTHDR_CHECK() not m_pulldown())
*/
void
ip6_savecontrol(struct in6pcb *in6p, struct mbuf **mp,
struct ip6_hdr *ip6, struct mbuf *m)
{
#ifdef RFC2292
#define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
#else
#define IS2292(x, y) (y)
#endif
if (in6p->in6p_socket->so_options & SO_TIMESTAMP
#ifdef SO_OTIMESTAMP
|| in6p->in6p_socket->so_options & SO_OTIMESTAMP
#endif
) {
struct timeval tv;
microtime(&tv);
#ifdef SO_OTIMESTAMP
if (in6p->in6p_socket->so_options & SO_OTIMESTAMP) {
struct timeval50 tv50;
timeval_to_timeval50(&tv, &tv50);
*mp = sbcreatecontrol((void *) &tv50, sizeof(tv50),
SCM_OTIMESTAMP, SOL_SOCKET);
} else
#endif
*mp = sbcreatecontrol((void *) &tv, sizeof(tv),
SCM_TIMESTAMP, SOL_SOCKET);
if (*mp)
mp = &(*mp)->m_next;
}
/* some OSes call this logic with IPv4 packet, for SO_TIMESTAMP */
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION)
return;
/* RFC 2292 sec. 5 */
if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
struct in6_pktinfo pi6;
memcpy(&pi6.ipi6_addr, &ip6->ip6_dst, sizeof(struct in6_addr));
in6_clearscope(&pi6.ipi6_addr); /* XXX */
pi6.ipi6_ifindex = m->m_pkthdr.rcvif ?
m->m_pkthdr.rcvif->if_index : 0;
*mp = sbcreatecontrol((void *) &pi6,
sizeof(struct in6_pktinfo),
IS2292(IPV6_2292PKTINFO, IPV6_PKTINFO), IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
}
if (in6p->in6p_flags & IN6P_HOPLIMIT) {
int hlim = ip6->ip6_hlim & 0xff;
*mp = sbcreatecontrol((void *) &hlim, sizeof(int),
IS2292(IPV6_2292HOPLIMIT, IPV6_HOPLIMIT), IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
}
if ((in6p->in6p_flags & IN6P_TCLASS) != 0) {
u_int32_t flowinfo;
int tclass;
flowinfo = (u_int32_t)ntohl(ip6->ip6_flow & IPV6_FLOWINFO_MASK);
flowinfo >>= 20;
tclass = flowinfo & 0xff;
*mp = sbcreatecontrol((void *)&tclass, sizeof(tclass),
IPV6_TCLASS, IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
}
/*
* IPV6_HOPOPTS socket option. Recall that we required super-user
* privilege for the option (see ip6_ctloutput), but it might be too
* strict, since there might be some hop-by-hop options which can be
* returned to normal user.
* See also RFC3542 section 8 (or RFC2292 section 6).
*/
if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0) {
/*
* Check if a hop-by-hop options header is contatined in the
* received packet, and if so, store the options as ancillary
* data. Note that a hop-by-hop options header must be
* just after the IPv6 header, which fact is assured through
* the IPv6 input processing.
*/
struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
if (xip6->ip6_nxt == IPPROTO_HOPOPTS) {
struct ip6_hbh *hbh;
int hbhlen;
struct mbuf *ext;
ext = ip6_pullexthdr(m, sizeof(struct ip6_hdr),
xip6->ip6_nxt);
if (ext == NULL) {
IP6_STATINC(IP6_STAT_TOOSHORT);
return;
}
hbh = mtod(ext, struct ip6_hbh *);
hbhlen = (hbh->ip6h_len + 1) << 3;
if (hbhlen != ext->m_len) {
m_freem(ext);
IP6_STATINC(IP6_STAT_TOOSHORT);
return;
}
/*
* XXX: We copy whole the header even if a jumbo
* payload option is included, which option is to
* be removed before returning in the RFC 2292.
* Note: this constraint is removed in RFC3542.
*/
*mp = sbcreatecontrol((void *)hbh, hbhlen,
IS2292(IPV6_2292HOPOPTS, IPV6_HOPOPTS),
IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
m_freem(ext);
}
}
/* IPV6_DSTOPTS and IPV6_RTHDR socket options */
if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
struct ip6_hdr *xip6 = mtod(m, struct ip6_hdr *);
int nxt = xip6->ip6_nxt, off = sizeof(struct ip6_hdr);
/*
* Search for destination options headers or routing
* header(s) through the header chain, and stores each
* header as ancillary data.
* Note that the order of the headers remains in
* the chain of ancillary data.
*/
for (;;) { /* is explicit loop prevention necessary? */
struct ip6_ext *ip6e = NULL;
int elen;
struct mbuf *ext = NULL;
/*
* if it is not an extension header, don't try to
* pull it from the chain.
*/
switch (nxt) {
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
case IPPROTO_HOPOPTS:
case IPPROTO_AH: /* is it possible? */
break;
default:
goto loopend;
}
ext = ip6_pullexthdr(m, off, nxt);
if (ext == NULL) {
IP6_STATINC(IP6_STAT_TOOSHORT);
return;
}
ip6e = mtod(ext, struct ip6_ext *);
if (nxt == IPPROTO_AH)
elen = (ip6e->ip6e_len + 2) << 2;
else
elen = (ip6e->ip6e_len + 1) << 3;
if (elen != ext->m_len) {
m_freem(ext);
IP6_STATINC(IP6_STAT_TOOSHORT);
return;
}
KASSERT(IP6_HDR_ALIGNED_P(ip6e));
switch (nxt) {
case IPPROTO_DSTOPTS:
if (!(in6p->in6p_flags & IN6P_DSTOPTS))
break;
*mp = sbcreatecontrol((void *)ip6e, elen,
IS2292(IPV6_2292DSTOPTS, IPV6_DSTOPTS),
IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
break;
case IPPROTO_ROUTING:
if (!(in6p->in6p_flags & IN6P_RTHDR))
break;
*mp = sbcreatecontrol((void *)ip6e, elen,
IS2292(IPV6_2292RTHDR, IPV6_RTHDR),
IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
break;
case IPPROTO_HOPOPTS:
case IPPROTO_AH: /* is it possible? */
break;
default:
/*
* other cases have been filtered in the above.
* none will visit this case. here we supply
* the code just in case (nxt overwritten or
* other cases).
*/
m_freem(ext);
goto loopend;
}
/* proceed with the next header. */
off += elen;
nxt = ip6e->ip6e_nxt;
ip6e = NULL;
m_freem(ext);
ext = NULL;
}
loopend:
;
}
}
#undef IS2292
void
ip6_notify_pmtu(struct in6pcb *in6p, const struct sockaddr_in6 *dst,
uint32_t *mtu)
{
struct socket *so;
struct mbuf *m_mtu;
struct ip6_mtuinfo mtuctl;
so = in6p->in6p_socket;
if (mtu == NULL)
return;
#ifdef DIAGNOSTIC
if (so == NULL) /* I believe this is impossible */
panic("ip6_notify_pmtu: socket is NULL");
#endif
memset(&mtuctl, 0, sizeof(mtuctl)); /* zero-clear for safety */
mtuctl.ip6m_mtu = *mtu;
mtuctl.ip6m_addr = *dst;
if (sa6_recoverscope(&mtuctl.ip6m_addr))
return;
if ((m_mtu = sbcreatecontrol((void *)&mtuctl, sizeof(mtuctl),
IPV6_PATHMTU, IPPROTO_IPV6)) == NULL)
return;
if (sbappendaddr(&so->so_rcv, (const struct sockaddr *)dst, NULL, m_mtu)
== 0) {
m_freem(m_mtu);
/* XXX: should count statistics */
} else
sorwakeup(so);
return;
}
/*
* pull single extension header from mbuf chain. returns single mbuf that
* contains the result, or NULL on error.
*/
static struct mbuf *
ip6_pullexthdr(struct mbuf *m, size_t off, int nxt)
{
struct ip6_ext ip6e;
size_t elen;
struct mbuf *n;
#ifdef DIAGNOSTIC
switch (nxt) {
case IPPROTO_DSTOPTS:
case IPPROTO_ROUTING:
case IPPROTO_HOPOPTS:
case IPPROTO_AH: /* is it possible? */
break;
default:
printf("ip6_pullexthdr: invalid nxt=%d\n", nxt);
}
#endif
m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
if (nxt == IPPROTO_AH)
elen = (ip6e.ip6e_len + 2) << 2;
else
elen = (ip6e.ip6e_len + 1) << 3;
MGET(n, M_DONTWAIT, MT_DATA);
if (n && elen >= MLEN) {
MCLGET(n, M_DONTWAIT);
if ((n->m_flags & M_EXT) == 0) {
m_free(n);
n = NULL;
}
}
if (!n)
return NULL;
n->m_len = 0;
if (elen >= M_TRAILINGSPACE(n)) {
m_free(n);
return NULL;
}
m_copydata(m, off, elen, mtod(n, void *));
n->m_len = elen;
return n;
}
/*
* Get pointer to the previous header followed by the header
* currently processed.
* XXX: This function supposes that
* M includes all headers,
* the next header field and the header length field of each header
* are valid, and
* the sum of each header length equals to OFF.
* Because of these assumptions, this function must be called very
* carefully. Moreover, it will not be used in the near future when
* we develop `neater' mechanism to process extension headers.
*/
u_int8_t *
ip6_get_prevhdr(struct mbuf *m, int off)
{
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
if (off == sizeof(struct ip6_hdr))
return (&ip6->ip6_nxt);
else {
int len, nxt;
struct ip6_ext *ip6e = NULL;
nxt = ip6->ip6_nxt;
len = sizeof(struct ip6_hdr);
while (len < off) {
ip6e = (struct ip6_ext *)(mtod(m, char *) + len);
switch (nxt) {
case IPPROTO_FRAGMENT:
len += sizeof(struct ip6_frag);
break;
case IPPROTO_AH:
len += (ip6e->ip6e_len + 2) << 2;
break;
default:
len += (ip6e->ip6e_len + 1) << 3;
break;
}
nxt = ip6e->ip6e_nxt;
}
if (ip6e)
return (&ip6e->ip6e_nxt);
else
return NULL;
}
}
/*
* get next header offset. m will be retained.
*/
int
ip6_nexthdr(struct mbuf *m, int off, int proto, int *nxtp)
{
struct ip6_hdr ip6;
struct ip6_ext ip6e;
struct ip6_frag fh;
/* just in case */
if (m == NULL)
panic("ip6_nexthdr: m == NULL");
if ((m->m_flags & M_PKTHDR) == 0 || m->m_pkthdr.len < off)
return -1;
switch (proto) {
case IPPROTO_IPV6:
/* do not chase beyond intermediate IPv6 headers */
if (off != 0)
return -1;
if (m->m_pkthdr.len < off + sizeof(ip6))
return -1;
m_copydata(m, off, sizeof(ip6), (void *)&ip6);
if (nxtp)
*nxtp = ip6.ip6_nxt;
off += sizeof(ip6);
return off;
case IPPROTO_FRAGMENT:
/*
* terminate parsing if it is not the first fragment,
* it does not make sense to parse through it.
*/
if (m->m_pkthdr.len < off + sizeof(fh))
return -1;
m_copydata(m, off, sizeof(fh), (void *)&fh);
if ((fh.ip6f_offlg & IP6F_OFF_MASK) != 0)
return -1;
if (nxtp)
*nxtp = fh.ip6f_nxt;
off += sizeof(struct ip6_frag);
return off;
case IPPROTO_AH:
if (m->m_pkthdr.len < off + sizeof(ip6e))
return -1;
m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
if (nxtp)
*nxtp = ip6e.ip6e_nxt;
off += (ip6e.ip6e_len + 2) << 2;
if (m->m_pkthdr.len < off)
return -1;
return off;
case IPPROTO_HOPOPTS:
case IPPROTO_ROUTING:
case IPPROTO_DSTOPTS:
if (m->m_pkthdr.len < off + sizeof(ip6e))
return -1;
m_copydata(m, off, sizeof(ip6e), (void *)&ip6e);
if (nxtp)
*nxtp = ip6e.ip6e_nxt;
off += (ip6e.ip6e_len + 1) << 3;
if (m->m_pkthdr.len < off)
return -1;
return off;
case IPPROTO_NONE:
case IPPROTO_ESP:
case IPPROTO_IPCOMP:
/* give up */
return -1;
default:
return -1;
}
}
/*
* get offset for the last header in the chain. m will be kept untainted.
*/
int
ip6_lasthdr(struct mbuf *m, int off, int proto, int *nxtp)
{
int newoff;
int nxt;
if (!nxtp) {
nxt = -1;
nxtp = &nxt;
}
for (;;) {
newoff = ip6_nexthdr(m, off, proto, nxtp);
if (newoff < 0)
return off;
else if (newoff < off)
return -1; /* invalid */
else if (newoff == off)
return newoff;
off = newoff;
proto = *nxtp;
}
}
struct m_tag *
ip6_addaux(struct mbuf *m)
{
struct m_tag *mtag;
mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
if (!mtag) {
mtag = m_tag_get(PACKET_TAG_INET6, sizeof(struct ip6aux),
M_NOWAIT);
if (mtag) {
m_tag_prepend(m, mtag);
memset(mtag + 1, 0, sizeof(struct ip6aux));
}
}
return mtag;
}
struct m_tag *
ip6_findaux(struct mbuf *m)
{
struct m_tag *mtag;
mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
return mtag;
}
void
ip6_delaux(struct mbuf *m)
{
struct m_tag *mtag;
mtag = m_tag_find(m, PACKET_TAG_INET6, NULL);
if (mtag)
m_tag_delete(m, mtag);
}
#ifdef GATEWAY
/*
* sysctl helper routine for net.inet.ip6.maxflows. Since
* we could reduce this value, call ip6flow_reap();
*/
static int
sysctl_net_inet6_ip6_maxflows(SYSCTLFN_ARGS)
{
int error;
error = sysctl_lookup(SYSCTLFN_CALL(rnode));
if (error || newp == NULL)
return (error);
mutex_enter(softnet_lock);
KERNEL_LOCK(1, NULL);
ip6flow_reap(0);
KERNEL_UNLOCK_ONE(NULL);
mutex_exit(softnet_lock);
return (0);
}
static int
sysctl_net_inet6_ip6_hashsize(SYSCTLFN_ARGS)
{
int error, tmp;
struct sysctlnode node;
node = *rnode;
tmp = ip6_hashsize;
node.sysctl_data = &tmp;
error = sysctl_lookup(SYSCTLFN_CALL(&node));
if (error || newp == NULL)
return (error);
if ((tmp & (tmp - 1)) == 0 && tmp != 0) {
/*
* Can only fail due to malloc()
*/
mutex_enter(softnet_lock);
KERNEL_LOCK(1, NULL);
error = ip6flow_invalidate_all(tmp);
KERNEL_UNLOCK_ONE(NULL);
mutex_exit(softnet_lock);
} else {
/*
* EINVAL if not a power of 2
*/
error = EINVAL;
}
return error;
}
#endif /* GATEWAY */
/*
* System control for IP6
*/
const u_char inet6ctlerrmap[PRC_NCMDS] = {
0, 0, 0, 0,
0, EMSGSIZE, EHOSTDOWN, EHOSTUNREACH,
EHOSTUNREACH, EHOSTUNREACH, ECONNREFUSED, ECONNREFUSED,
EMSGSIZE, EHOSTUNREACH, 0, 0,
0, 0, 0, 0,
ENOPROTOOPT
};
static int
sysctl_net_inet6_ip6_stats(SYSCTLFN_ARGS)
{
return (NETSTAT_SYSCTL(ip6stat_percpu, IP6_NSTATS));
}
static void
sysctl_net_inet6_ip6_setup(struct sysctllog **clog)
{
#ifdef RFC2292
#define IS2292(x, y) ((in6p->in6p_flags & IN6P_RFC2292) ? (x) : (y))
#else
#define IS2292(x, y) (y)
#endif
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "net", NULL,
NULL, 0, NULL, 0,
CTL_NET, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "inet6",
SYSCTL_DESCR("PF_INET6 related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET6, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_NODE, "ip6",
SYSCTL_DESCR("IPv6 related settings"),
NULL, 0, NULL, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "forwarding",
SYSCTL_DESCR("Enable forwarding of INET6 datagrams"),
NULL, 0, &ip6_forwarding, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_FORWARDING, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "redirect",
SYSCTL_DESCR("Enable sending of ICMPv6 redirect messages"),
NULL, 0, &ip6_sendredirects, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_SENDREDIRECTS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "hlim",
SYSCTL_DESCR("Hop limit for an INET6 datagram"),
NULL, 0, &ip6_defhlim, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_DEFHLIM, CTL_EOL);
#ifdef notyet
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "mtu", NULL,
NULL, 0, &, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_DEFMTU, CTL_EOL);
#endif
#ifdef __no_idea__
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "forwsrcrt", NULL,
NULL, 0, &?, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_FORWSRCRT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_STRUCT, "mrtstats", NULL,
NULL, 0, &?, sizeof(?),
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_MRTSTATS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_?, "mrtproto", NULL,
NULL, 0, &?, sizeof(?),
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_MRTPROTO, CTL_EOL);
#endif
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxfragpackets",
SYSCTL_DESCR("Maximum number of fragments to buffer "
"for reassembly"),
NULL, 0, &ip6_maxfragpackets, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_MAXFRAGPACKETS, CTL_EOL);
#ifdef __no_idea__
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "sourcecheck", NULL,
NULL, 0, &?, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_SOURCECHECK, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "sourcecheck_logint", NULL,
NULL, 0, &?, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_SOURCECHECK_LOGINT, CTL_EOL);
#endif
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "accept_rtadv",
SYSCTL_DESCR("Accept router advertisements"),
NULL, 0, &ip6_accept_rtadv, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_ACCEPT_RTADV, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "keepfaith",
SYSCTL_DESCR("Activate faith interface"),
NULL, 0, &ip6_keepfaith, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_KEEPFAITH, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "log_interval",
SYSCTL_DESCR("Minumum interval between logging "
"unroutable packets"),
NULL, 0, &ip6_log_interval, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_LOG_INTERVAL, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "hdrnestlimit",
SYSCTL_DESCR("Maximum number of nested IPv6 headers"),
NULL, 0, &ip6_hdrnestlimit, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_HDRNESTLIMIT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "dad_count",
SYSCTL_DESCR("Number of Duplicate Address Detection "
"probes to send"),
NULL, 0, &ip6_dad_count, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_DAD_COUNT, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "auto_flowlabel",
SYSCTL_DESCR("Assign random IPv6 flow labels"),
NULL, 0, &ip6_auto_flowlabel, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_AUTO_FLOWLABEL, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "defmcasthlim",
SYSCTL_DESCR("Default multicast hop limit"),
NULL, 0, &ip6_defmcasthlim, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_DEFMCASTHLIM, CTL_EOL);
#if NGIF > 0
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "gifhlim",
SYSCTL_DESCR("Default hop limit for a gif tunnel datagram"),
NULL, 0, &ip6_gif_hlim, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_GIF_HLIM, CTL_EOL);
#endif /* NGIF */
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRING, "kame_version",
SYSCTL_DESCR("KAME Version"),
NULL, 0, __UNCONST(__KAME_VERSION), 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_KAME_VERSION, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "use_deprecated",
SYSCTL_DESCR("Allow use of deprecated addresses as "
"source addresses"),
NULL, 0, &ip6_use_deprecated, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_USE_DEPRECATED, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "rr_prune", NULL,
NULL, 0, &ip6_rr_prune, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_RR_PRUNE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT
#ifndef INET6_BINDV6ONLY
|CTLFLAG_READWRITE,
#endif
CTLTYPE_INT, "v6only",
SYSCTL_DESCR("Disallow PF_INET6 sockets from connecting "
"to PF_INET sockets"),
NULL, 0, &ip6_v6only, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_V6ONLY, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "anonportmin",
SYSCTL_DESCR("Lowest ephemeral port number to assign"),
sysctl_net_inet_ip_ports, 0, &ip6_anonportmin, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_ANONPORTMIN, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "anonportmax",
SYSCTL_DESCR("Highest ephemeral port number to assign"),
sysctl_net_inet_ip_ports, 0, &ip6_anonportmax, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_ANONPORTMAX, CTL_EOL);
#ifndef IPNOPRIVPORTS
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "lowportmin",
SYSCTL_DESCR("Lowest privileged ephemeral port number "
"to assign"),
sysctl_net_inet_ip_ports, 0, &ip6_lowportmin, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_LOWPORTMIN, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "lowportmax",
SYSCTL_DESCR("Highest privileged ephemeral port number "
"to assign"),
sysctl_net_inet_ip_ports, 0, &ip6_lowportmax, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_LOWPORTMAX, CTL_EOL);
#endif /* IPNOPRIVPORTS */
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "use_tempaddr",
SYSCTL_DESCR("Use temporary address"),
NULL, 0, &ip6_use_tempaddr, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "temppltime",
SYSCTL_DESCR("preferred lifetime of a temporary address"),
NULL, 0, &ip6_temp_preferred_lifetime, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "tempvltime",
SYSCTL_DESCR("valid lifetime of a temporary address"),
NULL, 0, &ip6_temp_valid_lifetime, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxfrags",
SYSCTL_DESCR("Maximum fragments in reassembly queue"),
NULL, 0, &ip6_maxfrags, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_MAXFRAGS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT,
CTLTYPE_STRUCT, "stats",
SYSCTL_DESCR("IPv6 statistics"),
sysctl_net_inet6_ip6_stats, 0, NULL, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_STATS, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "use_defaultzone",
SYSCTL_DESCR("Whether to use the default scope zones"),
NULL, 0, &ip6_use_defzone, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
IPV6CTL_USE_DEFAULTZONE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "mcast_pmtu",
SYSCTL_DESCR("Enable pMTU discovery for multicast packet"),
NULL, 0, &ip6_mcast_pmtu, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
CTL_CREATE, CTL_EOL);
#ifdef GATEWAY
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "maxflows",
SYSCTL_DESCR("Number of flows for fast forwarding (IPv6)"),
sysctl_net_inet6_ip6_maxflows, 0, &ip6_maxflows, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
CTL_CREATE, CTL_EOL);
sysctl_createv(clog, 0, NULL, NULL,
CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
CTLTYPE_INT, "hashsize",
SYSCTL_DESCR("Size of hash table for fast forwarding (IPv6)"),
sysctl_net_inet6_ip6_hashsize, 0, &ip6_hashsize, 0,
CTL_NET, PF_INET6, IPPROTO_IPV6,
CTL_CREATE, CTL_EOL);
#endif
}
void
ip6_statinc(u_int stat)
{
KASSERT(stat < IP6_NSTATS);
IP6_STATINC(stat);
}
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