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NetBSD/sys/netinet6/ip6_input.c

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/* $NetBSD: ip6_input.c,v 1.60 2003/01/20 05:30:11 simonb 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 1.60 2003/01/20 05:30:11 simonb Exp $");
#include "opt_inet.h"
#include "opt_ipsec.h"
#include "opt_pfil_hooks.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/in6_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/in6_ifattach.h>
#include <netinet6/nd6.h>
#ifdef IPSEC
#include <netinet6/ipsec.h>
#endif
#include <netinet6/ip6protosw.h>
/* we need it for NLOOP. */
#include "loop.h"
#include "faith.h"
#include "gif.h"
#include "bpfilter.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 struct ifnet loif[NLOOP];
int ip6_forward_srcrt; /* XXX */
int ip6_sourcecheck; /* XXX */
int ip6_sourcecheck_interval; /* XXX */
#ifdef PFIL_HOOKS
struct pfil_head inet6_pfil_hook;
#endif
struct ip6stat ip6stat;
static void ip6_init2 __P((void *));
static int ip6_hopopts_input __P((u_int32_t *, u_int32_t *, struct mbuf **, int *));
/*
* IP6 initialization: fill in IP6 protocol switch table.
* All protocols not implemented in kernel go to raw IP6 protocol handler.
*/
void
ip6_init()
{
struct ip6protosw *pr;
int i;
pr = (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 = (struct ip6protosw *)inet6domain.dom_protosw;
pr < (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;
nd6_init();
frag6_init();
ip6_flow_seq = arc4random();
ip6_init2((void *)0);
#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 */
}
static void
ip6_init2(dummy)
void *dummy;
{
/* nd6_timer_init */
callout_init(&nd6_timer_ch);
callout_reset(&nd6_timer_ch, hz, nd6_timer, NULL);
}
/*
* IP6 input interrupt handling. Just pass the packet to ip6_input.
*/
void
ip6intr()
{
int s;
struct mbuf *m;
for (;;) {
s = splnet();
IF_DEQUEUE(&ip6intrq, m);
splx(s);
if (m == 0)
return;
ip6_input(m);
}
}
extern struct route_in6 ip6_forward_rt;
void
ip6_input(m)
struct mbuf *m;
{
struct ip6_hdr *ip6;
int off = sizeof(struct ip6_hdr), nest;
u_int32_t plen;
u_int32_t rtalert = ~0;
int nxt, ours = 0;
struct ifnet *deliverifp = NULL;
#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
/*
* mbuf statistics
*/
if (m->m_flags & M_EXT) {
if (m->m_next)
ip6stat.ip6s_mext2m++;
else
ip6stat.ip6s_mext1++;
} else {
#define M2MMAX (sizeof(ip6stat.ip6s_m2m)/sizeof(ip6stat.ip6s_m2m[0]))
if (m->m_next) {
if (m->m_flags & M_LOOP) {
ip6stat.ip6s_m2m[loif[0].if_index]++; /* XXX */
} else if (m->m_pkthdr.rcvif->if_index < M2MMAX)
ip6stat.ip6s_m2m[m->m_pkthdr.rcvif->if_index]++;
else
ip6stat.ip6s_m2m[0]++;
} else
ip6stat.ip6s_m1++;
#undef M2MMAX
}
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_receive);
ip6stat.ip6s_total++;
#ifndef PULLDOWN_TEST
/* XXX is the line really necessary? */
IP6_EXTHDR_CHECK(m, 0, sizeof(struct ip6_hdr), /*nothing*/);
#endif
/*
* 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, caddr_t)) == 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 */
ip6stat.ip6s_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) {
ip6stat.ip6s_toosmall++;
in6_ifstat_inc(inifp, ifs6_in_hdrerr);
return;
}
}
ip6 = mtod(m, struct ip6_hdr *);
if ((ip6->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) {
ip6stat.ip6s_badvers++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_hdrerr);
goto bad;
}
#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))
#else
if (1)
#endif
{
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 *);
}
#endif /* PFIL_HOOKS */
ip6stat.ip6s_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.
*/
ip6stat.ip6s_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)) {
ip6stat.ip6s_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)) {
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
#endif
if (IN6_IS_ADDR_LOOPBACK(&ip6->ip6_src) ||
IN6_IS_ADDR_LOOPBACK(&ip6->ip6_dst)) {
if (m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) {
ours = 1;
deliverifp = m->m_pkthdr.rcvif;
goto hbhcheck;
} else {
ip6stat.ip6s_badscope++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_addrerr);
goto bad;
}
}
/* drop packets if interface ID portion is already filled */
if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) == 0) {
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src) &&
ip6->ip6_src.s6_addr16[1]) {
ip6stat.ip6s_badscope++;
goto bad;
}
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst) &&
ip6->ip6_dst.s6_addr16[1]) {
ip6stat.ip6s_badscope++;
goto bad;
}
}
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src))
ip6->ip6_src.s6_addr16[1]
= htons(m->m_pkthdr.rcvif->if_index);
if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst))
ip6->ip6_dst.s6_addr16[1]
= htons(m->m_pkthdr.rcvif->if_index);
/*
* We use rt->rt_ifp to determine if the address is ours or not.
* If rt_ifp is lo0, the address is ours.
* The problem here is, rt->rt_ifp for fe80::%lo0/64 is set to lo0,
* so any address under fe80::%lo0/64 will be mistakenly considered
* local. The special case is supplied to handle the case properly
* by actually looking at interface addresses
* (using in6ifa_ifpwithaddr).
*/
if ((m->m_pkthdr.rcvif->if_flags & IFF_LOOPBACK) != 0 &&
IN6_IS_ADDR_LINKLOCAL(&ip6->ip6_dst)) {
if (!in6ifa_ifpwithaddr(m->m_pkthdr.rcvif, &ip6->ip6_dst)) {
icmp6_error(m, ICMP6_DST_UNREACH,
ICMP6_DST_UNREACH_ADDR, 0);
/* m is already freed */
return;
}
ours = 1;
deliverifp = m->m_pkthdr.rcvif;
goto hbhcheck;
}
/*
* 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) {
ip6stat.ip6s_notmember++;
ip6stat.ip6s_cantforward++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
goto bad;
}
deliverifp = m->m_pkthdr.rcvif;
goto hbhcheck;
}
/*
* Unicast check
*/
if (ip6_forward_rt.ro_rt != NULL &&
(ip6_forward_rt.ro_rt->rt_flags & RTF_UP) != 0 &&
IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst,
&((struct sockaddr_in6 *)(&ip6_forward_rt.ro_dst))->sin6_addr))
ip6stat.ip6s_forward_cachehit++;
else {
struct sockaddr_in6 *dst6;
if (ip6_forward_rt.ro_rt) {
/* route is down or destination is different */
ip6stat.ip6s_forward_cachemiss++;
RTFREE(ip6_forward_rt.ro_rt);
ip6_forward_rt.ro_rt = 0;
}
bzero(&ip6_forward_rt.ro_dst, sizeof(struct sockaddr_in6));
dst6 = (struct sockaddr_in6 *)&ip6_forward_rt.ro_dst;
dst6->sin6_len = sizeof(struct sockaddr_in6);
dst6->sin6_family = AF_INET6;
dst6->sin6_addr = ip6->ip6_dst;
rtalloc((struct route *)&ip6_forward_rt);
}
#define rt6_key(r) ((struct sockaddr_in6 *)((r)->rt_nodes->rn_key))
/*
* 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 (ip6_forward_rt.ro_rt &&
(ip6_forward_rt.ro_rt->rt_flags &
(RTF_HOST|RTF_GATEWAY)) == RTF_HOST &&
!(ip6_forward_rt.ro_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_key(ip6_forward_rt.ro_rt)->sin6_addr) &&
#endif
ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_LOOP) {
struct in6_ifaddr *ia6 =
(struct in6_ifaddr *)ip6_forward_rt.ro_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 (ip6_forward_rt.ro_rt && ip6_forward_rt.ro_rt->rt_ifp
&& ip6_forward_rt.ro_rt->rt_ifp->if_type == IFT_FAITH) {
/* XXX do we need more sanity checks? */
ours = 1;
deliverifp = ip6_forward_rt.ro_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;
for (ifa = m->m_pkthdr.rcvif->if_addrlist.tqh_first;
ifa;
ifa = ifa->ifa_list.tqe_next) {
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) {
ip6stat.ip6s_cantforward++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_discard);
goto bad;
}
hbhcheck:
/*
* 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_hoptops_input() must set a valid
* (non-zero) payload length to the variable plen.
*/
ip6stat.ip6s_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,
(caddr_t)&ip6->ip6_plen - (caddr_t)ip6);
return;
}
#ifndef PULLDOWN_TEST
/* ip6_hopopts_input() ensures that mbuf is contiguous */
hbh = (struct ip6_hbh *)(ip6 + 1);
#else
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m, sizeof(struct ip6_hdr),
sizeof(struct ip6_hbh));
if (hbh == NULL) {
ip6stat.ip6s_tooshort++;
return;
}
#endif
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) {
ip6stat.ip6s_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)) {
ip6stat.ip6s_cantforward++;
m_freem(m);
return;
}
if (!ours) {
m_freem(m);
return;
}
} else if (!ours) {
ip6_forward(m, 0);
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)) {
ip6stat.ip6s_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
ip6stat.ip6s_delivered++;
in6_ifstat_inc(deliverifp, ifs6_in_deliver);
nest = 0;
while (nxt != IPPROTO_DONE) {
if (ip6_hdrnestlimit && (++nest > ip6_hdrnestlimit)) {
ip6stat.ip6s_toomanyhdr++;
goto bad;
}
/*
* protection against faulty packet - there should be
* more sanity checks in header chain processing.
*/
if (m->m_pkthdr.len < off) {
ip6stat.ip6s_tooshort++;
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
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)) {
ipsec6stat.in_polvio++;
goto bad;
}
#endif
nxt = (*inet6sw[ip6_protox[nxt]].pr_input)(&m, &off, nxt);
}
return;
bad:
m_freem(m);
}
/*
* Hop-by-Hop options header processing. If a valid jumbo payload option is
* included, the real payload length will be stored in plenp.
*/
static int
ip6_hopopts_input(plenp, rtalertp, mp, offp)
u_int32_t *plenp;
u_int32_t *rtalertp; /* XXX: should be stored more smart way */
struct mbuf **mp;
int *offp;
{
struct mbuf *m = *mp;
int off = *offp, hbhlen;
struct ip6_hbh *hbh;
u_int8_t *opt;
/* validation of the length of the header */
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(*hbh), -1);
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
hbhlen = (hbh->ip6h_len + 1) << 3;
IP6_EXTHDR_CHECK(m, off, hbhlen, -1);
hbh = (struct ip6_hbh *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
if (hbh == NULL) {
ip6stat.ip6s_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) {
ip6stat.ip6s_tooshort++;
return -1;
}
#endif
KASSERT(IP6_HDR_ALIGNED_P(hbh));
off += hbhlen;
hbhlen -= sizeof(struct ip6_hbh);
opt = (u_int8_t *)hbh + 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(m, opthead, hbhlen, rtalertp, plenp)
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) {
ip6stat.ip6s_toosmall++;
goto bad;
}
optlen = *(opt + 1) + 2;
break;
case IP6OPT_RTALERT:
/* XXX may need check for alignment */
if (hbhlen < IP6OPT_RTALERT_LEN) {
ip6stat.ip6s_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;
bcopy((caddr_t)(opt + 2), (caddr_t)&rtalert_val, 2);
*rtalertp = ntohs(rtalert_val);
break;
case IP6OPT_JUMBO:
/* XXX may need check for alignment */
if (hbhlen < IP6OPT_JUMBO_LEN) {
ip6stat.ip6s_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) {
ip6stat.ip6s_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().
*/
bcopy(opt + 2, &jumboplen, 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) {
ip6stat.ip6s_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) {
ip6stat.ip6s_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) {
ip6stat.ip6s_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(optp, m, off)
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 */
ip6stat.ip6s_badoptions++;
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_OPTION, off);
return (-1);
case IP6OPT_TYPE_ICMP: /* send ICMP if not multicasted */
ip6stat.ip6s_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(in6p, mp, ip6, m)
struct in6pcb *in6p;
struct mbuf **mp;
struct ip6_hdr *ip6;
struct mbuf *m;
{
struct proc *p = curproc; /* XXX */
int privileged;
privileged = 0;
if (p && !suser(p->p_ucred, &p->p_acflag))
privileged++;
#ifdef SO_TIMESTAMP
if (in6p->in6p_socket->so_options & SO_TIMESTAMP) {
struct timeval tv;
microtime(&tv);
*mp = sbcreatecontrol((caddr_t) &tv, sizeof(tv),
SCM_TIMESTAMP, SOL_SOCKET);
if (*mp)
mp = &(*mp)->m_next;
}
#endif
if (in6p->in6p_flags & IN6P_RECVDSTADDR) {
*mp = sbcreatecontrol((caddr_t) &ip6->ip6_dst,
sizeof(struct in6_addr), IPV6_RECVDSTADDR,
IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
}
#ifdef noyet
/* options were tossed above */
if (in6p->in6p_flags & IN6P_RECVOPTS)
/* broken */
/* ip6_srcroute doesn't do what we want here, need to fix */
if (in6p->in6p_flags & IPV6P_RECVRETOPTS)
/* broken */
#endif
/* RFC 2292 sec. 5 */
if ((in6p->in6p_flags & IN6P_PKTINFO) != 0) {
struct in6_pktinfo pi6;
bcopy(&ip6->ip6_dst, &pi6.ipi6_addr, sizeof(struct in6_addr));
if (IN6_IS_SCOPE_LINKLOCAL(&pi6.ipi6_addr))
pi6.ipi6_addr.s6_addr16[1] = 0;
pi6.ipi6_ifindex = (m && m->m_pkthdr.rcvif)
? m->m_pkthdr.rcvif->if_index
: 0;
*mp = sbcreatecontrol((caddr_t) &pi6,
sizeof(struct in6_pktinfo), IPV6_PKTINFO,
IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
}
if (in6p->in6p_flags & IN6P_HOPLIMIT) {
int hlim = ip6->ip6_hlim & 0xff;
*mp = sbcreatecontrol((caddr_t) &hlim,
sizeof(int), IPV6_HOPLIMIT, IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
}
/* IN6P_NEXTHOP - for outgoing packet only */
/*
* IPV6_HOPOPTS socket option. We require super-user privilege
* for the option, but it might be too strict, since there might
* be some hop-by-hop options which can be returned to normal user.
* See RFC 2292 section 6.
*/
if ((in6p->in6p_flags & IN6P_HOPOPTS) != 0 && privileged) {
/*
* 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 *ip6 = mtod(m, struct ip6_hdr *);
if (ip6->ip6_nxt == IPPROTO_HOPOPTS) {
struct ip6_hbh *hbh;
int hbhlen;
#ifndef PULLDOWN_TEST
hbh = (struct ip6_hbh *)(ip6 + 1);
hbhlen = (hbh->ip6h_len + 1) << 3;
#else
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
sizeof(struct ip6_hdr), sizeof(struct ip6_hbh));
if (hbh == NULL) {
ip6stat.ip6s_tooshort++;
return;
}
hbhlen = (hbh->ip6h_len + 1) << 3;
IP6_EXTHDR_GET(hbh, struct ip6_hbh *, m,
sizeof(struct ip6_hdr), hbhlen);
if (hbh == NULL) {
ip6stat.ip6s_tooshort++;
return;
}
#endif
/*
* 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.
* But it's too painful operation...
*/
*mp = sbcreatecontrol((caddr_t)hbh, hbhlen,
IPV6_HOPOPTS, IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
}
}
/* IPV6_DSTOPTS and IPV6_RTHDR socket options */
if (in6p->in6p_flags & (IN6P_DSTOPTS | IN6P_RTHDR)) {
struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
int nxt = ip6->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.
*/
while (1) { /* is explicit loop prevention necessary? */
struct ip6_ext *ip6e;
int elen;
#ifndef PULLDOWN_TEST
ip6e = (struct ip6_ext *)(mtod(m, caddr_t) + off);
if (nxt == IPPROTO_AH)
elen = (ip6e->ip6e_len + 2) << 2;
else
elen = (ip6e->ip6e_len + 1) << 3;
#else
IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off,
sizeof(struct ip6_ext));
if (ip6e == NULL) {
ip6stat.ip6s_tooshort++;
return;
}
if (nxt == IPPROTO_AH)
elen = (ip6e->ip6e_len + 2) << 2;
else
elen = (ip6e->ip6e_len + 1) << 3;
IP6_EXTHDR_GET(ip6e, struct ip6_ext *, m, off, elen);
if (ip6e == NULL) {
ip6stat.ip6s_tooshort++;
return;
}
#endif
KASSERT(IP6_HDR_ALIGNED_P(ip6e));
switch (nxt) {
case IPPROTO_DSTOPTS:
if (!in6p->in6p_flags & IN6P_DSTOPTS)
break;
/*
* We also require super-user privilege for
* the option.
* See the comments on IN6_HOPOPTS.
*/
if (!privileged)
break;
*mp = sbcreatecontrol((caddr_t)ip6e, elen,
IPV6_DSTOPTS,
IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
break;
case IPPROTO_ROUTING:
if (!in6p->in6p_flags & IN6P_RTHDR)
break;
*mp = sbcreatecontrol((caddr_t)ip6e, elen,
IPV6_RTHDR,
IPPROTO_IPV6);
if (*mp)
mp = &(*mp)->m_next;
break;
case IPPROTO_UDP:
case IPPROTO_TCP:
case IPPROTO_ICMPV6:
default:
/*
* stop search if we encounter an upper
* layer protocol headers.
*/
goto loopend;
case IPPROTO_HOPOPTS:
case IPPROTO_AH: /* is it possible? */
break;
}
/* proceed with the next header. */
off += elen;
nxt = ip6e->ip6e_nxt;
}
loopend:
;
}
if ((in6p->in6p_flags & IN6P_HOPOPTS) && privileged) {
/* to be done */
}
if ((in6p->in6p_flags & IN6P_DSTOPTS) && privileged) {
/* to be done */
}
/* IN6P_RTHDR - to be done */
}
/*
* 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(m, off)
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, caddr_t) + 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(m, off, proto, nxtp)
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:
if (m->m_pkthdr.len < off + sizeof(ip6))
return -1;
m_copydata(m, off, sizeof(ip6), (caddr_t)&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), (caddr_t)&fh);
if ((ntohs(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), (caddr_t)&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), (caddr_t)&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(m, off, proto, nxtp)
struct mbuf *m;
int off;
int proto;
int *nxtp;
{
int newoff;
int nxt;
if (!nxtp) {
nxt = -1;
nxtp = &nxt;
}
while (1) {
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;
}
}
/*
* System control for IP6
*/
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
};
int
ip6_sysctl(name, namelen, oldp, oldlenp, newp, newlen)
int *name;
u_int namelen;
void *oldp;
size_t *oldlenp;
void *newp;
size_t newlen;
{
int old, error;
/* All sysctl names at this level are terminal. */
if (namelen != 1)
return ENOTDIR;
switch (name[0]) {
case IPV6CTL_FORWARDING:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_forwarding);
case IPV6CTL_SENDREDIRECTS:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_sendredirects);
case IPV6CTL_DEFHLIM:
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_defhlim);
case IPV6CTL_MAXFRAGPACKETS:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_maxfragpackets);
case IPV6CTL_ACCEPT_RTADV:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_accept_rtadv);
case IPV6CTL_KEEPFAITH:
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_keepfaith);
case IPV6CTL_LOG_INTERVAL:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_log_interval);
case IPV6CTL_HDRNESTLIMIT:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_hdrnestlimit);
case IPV6CTL_DAD_COUNT:
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_dad_count);
case IPV6CTL_AUTO_FLOWLABEL:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_auto_flowlabel);
case IPV6CTL_DEFMCASTHLIM:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_defmcasthlim);
#if NGIF > 0
case IPV6CTL_GIF_HLIM:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_gif_hlim);
#endif
case IPV6CTL_KAME_VERSION:
return sysctl_rdstring(oldp, oldlenp, newp, __KAME_VERSION);
case IPV6CTL_USE_DEPRECATED:
return sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_use_deprecated);
case IPV6CTL_RR_PRUNE:
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_rr_prune);
case IPV6CTL_V6ONLY:
#ifdef INET6_BINDV6ONLY
return sysctl_rdint(oldp, oldlenp, newp, ip6_v6only);
#else
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_v6only);
#endif
case IPV6CTL_ANONPORTMIN:
old = ip6_anonportmin;
error = sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_anonportmin);
if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmin < 0 ||
ip6_anonportmin > 65535
#ifndef IPNOPRIVPORTS
|| ip6_anonportmin < IPV6PORT_RESERVED
#endif
) {
ip6_anonportmin = old;
return (EINVAL);
}
return (error);
case IPV6CTL_ANONPORTMAX:
old = ip6_anonportmax;
error = sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_anonportmax);
if (ip6_anonportmin >= ip6_anonportmax || ip6_anonportmax < 0 ||
ip6_anonportmax > 65535
#ifndef IPNOPRIVPORTS
|| ip6_anonportmax < IPV6PORT_RESERVED
#endif
) {
ip6_anonportmax = old;
return (EINVAL);
}
return (error);
#ifndef IPNOPRIVPORTS
case IPV6CTL_LOWPORTMIN:
old = ip6_lowportmin;
error = sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_lowportmin);
if (ip6_lowportmin >= ip6_lowportmax ||
ip6_lowportmin > IPV6PORT_RESERVEDMAX ||
ip6_lowportmin < IPV6PORT_RESERVEDMIN) {
ip6_lowportmin = old;
return (EINVAL);
}
return (error);
case IPV6CTL_LOWPORTMAX:
old = ip6_lowportmax;
error = sysctl_int(oldp, oldlenp, newp, newlen,
&ip6_lowportmax);
if (ip6_lowportmin >= ip6_lowportmax ||
ip6_lowportmax > IPV6PORT_RESERVEDMAX ||
ip6_lowportmax < IPV6PORT_RESERVEDMIN) {
ip6_lowportmax = old;
return (EINVAL);
}
return (error);
#endif
case IPV6CTL_MAXFRAGS:
return sysctl_int(oldp, oldlenp, newp, newlen, &ip6_maxfrags);
default:
return EOPNOTSUPP;
}
/* NOTREACHED */
}
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