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freebsd-nq/sys/netipsec/ipsec_input.c
Gleb Smirnoff 78b1fc05b2 protosw: separate pr_input and pr_ctlinput out of protosw 
The protosw KPI historically has implemented two quite orthogonal
things: protocols that implement a certain kind of socket, and
protocols that are IPv4/IPv6 protocol.  These two things do not
make one-to-one correspondence. The pr_input and pr_ctlinput methods
were utilized only in IP protocols.  This strange duality required
IP protocols that doesn't have a socket to declare protosw, e.g.
carp(4).  On the other hand developers of socket protocols thought
that they need to define pr_input/pr_ctlinput always, which lead to
strange dead code, e.g. div_input() or sdp_ctlinput().

With this change pr_input and pr_ctlinput as part of protosw disappear
and IPv4/IPv6 get their private single level protocol switch table
ip_protox[] and ip6_protox[] respectively, pointing at array of
ipproto_input_t functions.  The pr_ctlinput that was used for
control input coming from the network (ICMP, ICMPv6) is now represented
by ip_ctlprotox[] and ip6_ctlprotox[].

ipproto_register() becomes the only official way to register in the
table.  Those protocols that were always static and unlikely anybody
is interested in making them loadable, are now registered by ip_init(),
ip6_init().  An IP protocol that considers itself unloadable shall
register itself within its own private SYSINIT().

Reviewed by:		tuexen, melifaro
Differential revision:	https://reviews.freebsd.org/D36157
2022-08-17 11:50:31 -07:00

778 lines
20 KiB
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/* $OpenBSD: ipsec_input.c,v 1.63 2003/02/20 18:35:43 deraadt Exp $ */
/*-
* The authors of this code are John Ioannidis (ji@tla.org),
* Angelos D. Keromytis (kermit@csd.uch.gr) and
* Niels Provos (provos@physnet.uni-hamburg.de).
*
* This code was written by John Ioannidis for BSD/OS in Athens, Greece,
* in November 1995.
*
* Ported to OpenBSD and NetBSD, with additional transforms, in December 1996,
* by Angelos D. Keromytis.
*
* Additional transforms and features in 1997 and 1998 by Angelos D. Keromytis
* and Niels Provos.
*
* Additional features in 1999 by Angelos D. Keromytis.
*
* Copyright (C) 1995, 1996, 1997, 1998, 1999 by John Ioannidis,
* Angelos D. Keromytis and Niels Provos.
* Copyright (c) 2001, Angelos D. Keromytis.
* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
*
* Permission to use, copy, and modify this software with or without fee
* is hereby granted, provided that this entire notice is included in
* all copies of any software which is or includes a copy or
* modification of this software.
* You may use this code under the GNU public license if you so wish. Please
* contribute changes back to the authors under this freer than GPL license
* so that we may further the use of strong encryption without limitations to
* all.
*
* THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTY. IN PARTICULAR, NONE OF THE AUTHORS MAKES ANY
* REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE
* MERCHANTABILITY OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR
* PURPOSE.
*/
/*
* IPsec input processing.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include "opt_inet.h"
#include "opt_inet6.h"
#include "opt_ipsec.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/errno.h>
#include <sys/hhook.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_enc.h>
#include <net/netisr.h>
#include <net/vnet.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_icmp.h>
#include <netinet/in_var.h>
#include <netinet/tcp_var.h>
#include <netinet/ip6.h>
#ifdef INET6
#include <netinet6/ip6_var.h>
#endif
#include <netinet/in_pcb.h>
#ifdef INET6
#include <netinet/icmp6.h>
#endif
#include <netipsec/ipsec.h>
#ifdef INET6
#include <netipsec/ipsec6.h>
#endif
#include <netipsec/ah_var.h>
#include <netipsec/esp.h>
#include <netipsec/esp_var.h>
#include <netipsec/ipcomp_var.h>
#include <netipsec/key.h>
#include <netipsec/keydb.h>
#include <netipsec/key_debug.h>
#include <netipsec/xform.h>
#include <netinet6/ip6protosw.h>
#include <machine/in_cksum.h>
#include <machine/stdarg.h>
#define IPSEC_ISTAT(proto, name) do { \
if ((proto) == IPPROTO_ESP) \
ESPSTAT_INC(esps_##name); \
else if ((proto) == IPPROTO_AH) \
AHSTAT_INC(ahs_##name); \
else \
IPCOMPSTAT_INC(ipcomps_##name); \
} while (0)
/*
* ipsec_common_input gets called when an IPsec-protected packet
* is received by IPv4 or IPv6. Its job is to find the right SA
* and call the appropriate transform. The transform callback
* takes care of further processing (like ingress filtering).
*/
static int
ipsec_common_input(struct mbuf *m, int skip, int protoff, int af, int sproto)
{
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
union sockaddr_union dst_address;
struct secasvar *sav;
uint32_t spi;
int error;
IPSEC_ISTAT(sproto, input);
IPSEC_ASSERT(m != NULL, ("null packet"));
IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
sproto == IPPROTO_IPCOMP,
("unexpected security protocol %u", sproto));
if ((sproto == IPPROTO_ESP && !V_esp_enable) ||
(sproto == IPPROTO_AH && !V_ah_enable) ||
(sproto == IPPROTO_IPCOMP && !V_ipcomp_enable)) {
m_freem(m);
IPSEC_ISTAT(sproto, pdrops);
return EOPNOTSUPP;
}
if (m->m_pkthdr.len - skip < 2 * sizeof (u_int32_t)) {
m_freem(m);
IPSEC_ISTAT(sproto, hdrops);
DPRINTF(("%s: packet too small\n", __func__));
return EINVAL;
}
/* Retrieve the SPI from the relevant IPsec header */
if (sproto == IPPROTO_ESP)
m_copydata(m, skip, sizeof(u_int32_t), (caddr_t) &spi);
else if (sproto == IPPROTO_AH)
m_copydata(m, skip + sizeof(u_int32_t), sizeof(u_int32_t),
(caddr_t) &spi);
else if (sproto == IPPROTO_IPCOMP) {
u_int16_t cpi;
m_copydata(m, skip + sizeof(u_int16_t), sizeof(u_int16_t),
(caddr_t) &cpi);
spi = ntohl(htons(cpi));
}
/*
* Find the SA and (indirectly) call the appropriate
* kernel crypto routine. The resulting mbuf chain is a valid
* IP packet ready to go through input processing.
*/
bzero(&dst_address, sizeof (dst_address));
dst_address.sa.sa_family = af;
switch (af) {
#ifdef INET
case AF_INET:
dst_address.sin.sin_len = sizeof(struct sockaddr_in);
m_copydata(m, offsetof(struct ip, ip_dst),
sizeof(struct in_addr),
(caddr_t) &dst_address.sin.sin_addr);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
dst_address.sin6.sin6_len = sizeof(struct sockaddr_in6);
m_copydata(m, offsetof(struct ip6_hdr, ip6_dst),
sizeof(struct in6_addr),
(caddr_t) &dst_address.sin6.sin6_addr);
/* We keep addresses in SADB without embedded scope id */
if (IN6_IS_SCOPE_LINKLOCAL(&dst_address.sin6.sin6_addr)) {
/* XXX: sa6_recoverscope() */
dst_address.sin6.sin6_scope_id =
ntohs(dst_address.sin6.sin6_addr.s6_addr16[1]);
dst_address.sin6.sin6_addr.s6_addr16[1] = 0;
}
break;
#endif /* INET6 */
default:
DPRINTF(("%s: unsupported protocol family %u\n", __func__, af));
m_freem(m);
IPSEC_ISTAT(sproto, nopf);
return EPFNOSUPPORT;
}
/* NB: only pass dst since key_allocsa follows RFC2401 */
sav = key_allocsa(&dst_address, sproto, spi);
if (sav == NULL) {
DPRINTF(("%s: no key association found for SA %s/%08lx/%u\n",
__func__, ipsec_address(&dst_address, buf, sizeof(buf)),
(u_long) ntohl(spi), sproto));
IPSEC_ISTAT(sproto, notdb);
m_freem(m);
return ENOENT;
}
if (sav->tdb_xform == NULL) {
DPRINTF(("%s: attempted to use uninitialized SA %s/%08lx/%u\n",
__func__, ipsec_address(&dst_address, buf, sizeof(buf)),
(u_long) ntohl(spi), sproto));
IPSEC_ISTAT(sproto, noxform);
key_freesav(&sav);
m_freem(m);
return ENXIO;
}
/*
* Call appropriate transform and return -- callback takes care of
* everything else.
*/
error = (*sav->tdb_xform->xf_input)(m, sav, skip, protoff);
return (error);
}
#ifdef INET
/*
* IPSEC_INPUT() method implementation for IPv4.
* 0 - Permitted by inbound security policy for further processing.
* EACCES - Forbidden by inbound security policy.
* EINPROGRESS - consumed by IPsec.
*/
int
ipsec4_input(struct mbuf *m, int offset, int proto)
{
switch (proto) {
case IPPROTO_AH:
case IPPROTO_ESP:
case IPPROTO_IPCOMP:
/* Do inbound IPsec processing for AH/ESP/IPCOMP */
ipsec_common_input(m, offset,
offsetof(struct ip, ip_p), AF_INET, proto);
return (EINPROGRESS); /* mbuf consumed by IPsec */
default:
/*
* Protocols with further headers get their IPsec treatment
* within the protocol specific processing.
*/
switch (proto) {
case IPPROTO_ICMP:
case IPPROTO_IGMP:
case IPPROTO_IPV4:
case IPPROTO_IPV6:
case IPPROTO_RSVP:
case IPPROTO_GRE:
case IPPROTO_MOBILE:
case IPPROTO_ETHERIP:
case IPPROTO_PIM:
case IPPROTO_SCTP:
break;
default:
return (0);
}
};
/*
* Enforce IPsec policy checking if we are seeing last header.
*/
if (ipsec4_in_reject(m, NULL) != 0) {
/* Forbidden by inbound security policy */
m_freem(m);
return (EACCES);
}
return (0);
}
int
ipsec4_ctlinput(int code, struct sockaddr *sa, void *v)
{
struct in_conninfo inc;
struct secasvar *sav;
struct icmp *icp;
struct ip *ip = v;
uint32_t pmtu, spi;
uint32_t max_pmtu;
uint8_t proto;
if (code != PRC_MSGSIZE || ip == NULL)
return (EINVAL);
if (sa->sa_family != AF_INET ||
sa->sa_len != sizeof(struct sockaddr_in))
return (EAFNOSUPPORT);
icp = __containerof(ip, struct icmp, icmp_ip);
pmtu = ntohs(icp->icmp_nextmtu);
if (pmtu < V_ip4_ipsec_min_pmtu)
return (EINVAL);
proto = ip->ip_p;
if (proto != IPPROTO_ESP && proto != IPPROTO_AH &&
proto != IPPROTO_IPCOMP)
return (EINVAL);
memcpy(&spi, (caddr_t)ip + (ip->ip_hl << 2), sizeof(spi));
sav = key_allocsa((union sockaddr_union *)sa, proto, spi);
if (sav == NULL)
return (ENOENT);
key_freesav(&sav);
memset(&inc, 0, sizeof(inc));
inc.inc_faddr = satosin(sa)->sin_addr;
/* Update pmtu only if its smaller than the current one. */
max_pmtu = tcp_hc_getmtu(&inc);
if (max_pmtu == 0)
max_pmtu = tcp_maxmtu(&inc, NULL);
if (pmtu < max_pmtu)
tcp_hc_updatemtu(&inc, pmtu);
return (0);
}
/*
* IPsec input callback for INET protocols.
* This routine is called as the transform callback.
* Takes care of filtering and other sanity checks on
* the processed packet.
*/
int
ipsec4_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
int protoff)
{
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
struct epoch_tracker et;
struct ipsec_ctx_data ctx;
struct xform_history *xh;
struct secasindex *saidx;
struct m_tag *mtag;
struct ip *ip;
int error, prot, af, sproto, isr_prot;
IPSEC_ASSERT(sav != NULL, ("null SA"));
IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
saidx = &sav->sah->saidx;
af = saidx->dst.sa.sa_family;
IPSEC_ASSERT(af == AF_INET, ("unexpected af %u", af));
sproto = saidx->proto;
IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
sproto == IPPROTO_IPCOMP,
("unexpected security protocol %u", sproto));
if (skip != 0) {
/*
* Fix IPv4 header
*/
if (m->m_len < skip && (m = m_pullup(m, skip)) == NULL) {
DPRINTF(("%s: processing failed for SA %s/%08lx\n",
__func__, ipsec_address(&sav->sah->saidx.dst,
buf, sizeof(buf)), (u_long) ntohl(sav->spi)));
IPSEC_ISTAT(sproto, hdrops);
error = ENOBUFS;
goto bad_noepoch;
}
ip = mtod(m, struct ip *);
ip->ip_len = htons(m->m_pkthdr.len);
ip->ip_sum = 0;
ip->ip_sum = in_cksum(m, ip->ip_hl << 2);
} else {
ip = mtod(m, struct ip *);
}
prot = ip->ip_p;
/*
* Check that we have NAT-T enabled and apply transport mode
* decapsulation NAT procedure (RFC3948).
* Do this before invoking into the PFIL.
*/
if (sav->natt != NULL &&
(prot == IPPROTO_UDP || prot == IPPROTO_TCP))
udp_ipsec_adjust_cksum(m, sav, prot, skip);
/*
* Needed for ipsec_run_hooks and netisr_queue_src
*/
NET_EPOCH_ENTER(et);
IPSEC_INIT_CTX(&ctx, &m, NULL, sav, AF_INET, IPSEC_ENC_BEFORE);
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
goto bad;
ip = mtod(m, struct ip *); /* update pointer */
/* IP-in-IP encapsulation */
if (prot == IPPROTO_IPIP &&
saidx->mode != IPSEC_MODE_TRANSPORT) {
if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
IPSEC_ISTAT(sproto, hdrops);
error = EINVAL;
goto bad;
}
/* enc0: strip outer IPv4 header */
m_striphdr(m, 0, ip->ip_hl << 2);
}
#ifdef INET6
/* IPv6-in-IP encapsulation. */
else if (prot == IPPROTO_IPV6 &&
saidx->mode != IPSEC_MODE_TRANSPORT) {
if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
IPSEC_ISTAT(sproto, hdrops);
error = EINVAL;
goto bad;
}
/* enc0: strip IPv4 header, keep IPv6 header only */
m_striphdr(m, 0, ip->ip_hl << 2);
}
#endif /* INET6 */
else if (prot != IPPROTO_IPV6 && saidx->mode == IPSEC_MODE_ANY) {
/*
* When mode is wildcard, inner protocol is IPv6 and
* we have no INET6 support - drop this packet a bit later.
* In other cases we assume transport mode. Set prot to
* correctly choose netisr.
*/
prot = IPPROTO_IPIP;
}
/*
* Record what we've done to the packet (under what SA it was
* processed).
*/
if (sproto != IPPROTO_IPCOMP) {
mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
sizeof(struct xform_history), M_NOWAIT);
if (mtag == NULL) {
DPRINTF(("%s: failed to get tag\n", __func__));
IPSEC_ISTAT(sproto, hdrops);
error = ENOMEM;
goto bad;
}
xh = (struct xform_history *)(mtag + 1);
bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len);
xh->spi = sav->spi;
xh->proto = sproto;
xh->mode = saidx->mode;
m_tag_prepend(m, mtag);
}
key_sa_recordxfer(sav, m); /* record data transfer */
/*
* In transport mode requeue decrypted mbuf back to IPv4 protocol
* handler. This is necessary to correctly expose rcvif.
*/
if (saidx->mode == IPSEC_MODE_TRANSPORT)
prot = IPPROTO_IPIP;
/*
* Re-dispatch via software interrupt.
*/
switch (prot) {
case IPPROTO_IPIP:
isr_prot = NETISR_IP;
af = AF_INET;
break;
#ifdef INET6
case IPPROTO_IPV6:
isr_prot = NETISR_IPV6;
af = AF_INET6;
break;
#endif
default:
DPRINTF(("%s: cannot handle inner ip proto %d\n",
__func__, prot));
IPSEC_ISTAT(sproto, nopf);
error = EPFNOSUPPORT;
goto bad;
}
IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER);
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
goto bad;
/* Handle virtual tunneling interfaces */
if (saidx->mode == IPSEC_MODE_TUNNEL)
error = ipsec_if_input(m, sav, af);
if (error == 0) {
error = netisr_queue_src(isr_prot, (uintptr_t)sav->spi, m);
if (error) {
IPSEC_ISTAT(sproto, qfull);
DPRINTF(("%s: queue full; proto %u packet dropped\n",
__func__, sproto));
}
}
NET_EPOCH_EXIT(et);
key_freesav(&sav);
return (error);
bad:
NET_EPOCH_EXIT(et);
bad_noepoch:
key_freesav(&sav);
if (m != NULL)
m_freem(m);
return (error);
}
#endif /* INET */
#ifdef INET6
static bool
ipsec6_lasthdr(int proto)
{
switch (proto) {
case IPPROTO_IPV4:
case IPPROTO_IPV6:
case IPPROTO_GRE:
case IPPROTO_ICMPV6:
case IPPROTO_ETHERIP:
case IPPROTO_PIM:
case IPPROTO_SCTP:
return (true);
default:
return (false);
};
}
/*
* IPSEC_INPUT() method implementation for IPv6.
* 0 - Permitted by inbound security policy for further processing.
* EACCES - Forbidden by inbound security policy.
* EINPROGRESS - consumed by IPsec.
*/
int
ipsec6_input(struct mbuf *m, int offset, int proto)
{
switch (proto) {
case IPPROTO_AH:
case IPPROTO_ESP:
case IPPROTO_IPCOMP:
/* Do inbound IPsec processing for AH/ESP/IPCOMP */
ipsec_common_input(m, offset,
offsetof(struct ip6_hdr, ip6_nxt), AF_INET6, proto);
return (EINPROGRESS); /* mbuf consumed by IPsec */
default:
/*
* Protocols with further headers get their IPsec treatment
* within the protocol specific processing.
*/
if (!ipsec6_lasthdr(proto))
return (0);
/* FALLTHROUGH */
};
/*
* Enforce IPsec policy checking if we are seeing last header.
*/
if (ipsec6_in_reject(m, NULL) != 0) {
/* Forbidden by inbound security policy */
m_freem(m);
return (EACCES);
}
return (0);
}
int
ipsec6_ctlinput(int code, struct sockaddr *sa, void *v)
{
return (0);
}
extern ipproto_input_t *ip6_protox[];
/*
* IPsec input callback, called by the transform callback. Takes care of
* filtering and other sanity checks on the processed packet.
*/
int
ipsec6_common_input_cb(struct mbuf *m, struct secasvar *sav, int skip,
int protoff)
{
IPSEC_DEBUG_DECLARE(char buf[IPSEC_ADDRSTRLEN]);
struct epoch_tracker et;
struct ipsec_ctx_data ctx;
struct xform_history *xh;
struct secasindex *saidx;
struct ip6_hdr *ip6;
struct m_tag *mtag;
int prot, af, sproto;
int nxt, isr_prot;
int error, nest;
uint8_t nxt8;
IPSEC_ASSERT(sav != NULL, ("null SA"));
IPSEC_ASSERT(sav->sah != NULL, ("null SAH"));
saidx = &sav->sah->saidx;
af = saidx->dst.sa.sa_family;
IPSEC_ASSERT(af == AF_INET6, ("unexpected af %u", af));
sproto = saidx->proto;
IPSEC_ASSERT(sproto == IPPROTO_ESP || sproto == IPPROTO_AH ||
sproto == IPPROTO_IPCOMP,
("unexpected security protocol %u", sproto));
NET_EPOCH_ENTER(et);
/* Fix IPv6 header */
if (m->m_len < sizeof(struct ip6_hdr) &&
(m = m_pullup(m, sizeof(struct ip6_hdr))) == NULL) {
DPRINTF(("%s: processing failed for SA %s/%08lx\n",
__func__, ipsec_address(&sav->sah->saidx.dst, buf,
sizeof(buf)), (u_long) ntohl(sav->spi)));
IPSEC_ISTAT(sproto, hdrops);
error = EACCES;
goto bad;
}
IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_BEFORE);
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
goto bad;
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_plen = htons(m->m_pkthdr.len - sizeof(struct ip6_hdr));
/* Save protocol */
m_copydata(m, protoff, 1, &nxt8);
prot = nxt8;
/* IPv6-in-IP encapsulation */
if (prot == IPPROTO_IPV6 &&
saidx->mode != IPSEC_MODE_TRANSPORT) {
if (m->m_pkthdr.len - skip < sizeof(struct ip6_hdr)) {
IPSEC_ISTAT(sproto, hdrops);
error = EINVAL;
goto bad;
}
/* ip6n will now contain the inner IPv6 header. */
m_striphdr(m, 0, skip);
skip = 0;
}
#ifdef INET
/* IP-in-IP encapsulation */
else if (prot == IPPROTO_IPIP &&
saidx->mode != IPSEC_MODE_TRANSPORT) {
if (m->m_pkthdr.len - skip < sizeof(struct ip)) {
IPSEC_ISTAT(sproto, hdrops);
error = EINVAL;
goto bad;
}
/* ipn will now contain the inner IPv4 header */
m_striphdr(m, 0, skip);
skip = 0;
}
#endif /* INET */
else {
prot = IPPROTO_IPV6; /* for correct BPF processing */
}
/*
* Record what we've done to the packet (under what SA it was
* processed).
*/
if (sproto != IPPROTO_IPCOMP) {
mtag = m_tag_get(PACKET_TAG_IPSEC_IN_DONE,
sizeof(struct xform_history), M_NOWAIT);
if (mtag == NULL) {
DPRINTF(("%s: failed to get tag\n", __func__));
IPSEC_ISTAT(sproto, hdrops);
error = ENOMEM;
goto bad;
}
xh = (struct xform_history *)(mtag + 1);
bcopy(&saidx->dst, &xh->dst, saidx->dst.sa.sa_len);
xh->spi = sav->spi;
xh->proto = sproto;
xh->mode = saidx->mode;
m_tag_prepend(m, mtag);
}
key_sa_recordxfer(sav, m);
#ifdef INET
if (prot == IPPROTO_IPIP)
af = AF_INET;
else
#endif
af = AF_INET6;
IPSEC_INIT_CTX(&ctx, &m, NULL, sav, af, IPSEC_ENC_AFTER);
if ((error = ipsec_run_hhooks(&ctx, HHOOK_TYPE_IPSEC_IN)) != 0)
goto bad;
if (skip == 0) {
/*
* We stripped outer IPv6 header.
* Now we should requeue decrypted packet via netisr.
*/
switch (prot) {
#ifdef INET
case IPPROTO_IPIP:
isr_prot = NETISR_IP;
break;
#endif
case IPPROTO_IPV6:
isr_prot = NETISR_IPV6;
break;
default:
DPRINTF(("%s: cannot handle inner ip proto %d\n",
__func__, prot));
IPSEC_ISTAT(sproto, nopf);
error = EPFNOSUPPORT;
goto bad;
}
/* Handle virtual tunneling interfaces */
if (saidx->mode == IPSEC_MODE_TUNNEL)
error = ipsec_if_input(m, sav, af);
if (error == 0) {
error = netisr_queue_src(isr_prot,
(uintptr_t)sav->spi, m);
if (error) {
IPSEC_ISTAT(sproto, qfull);
DPRINTF(("%s: queue full; proto %u packet"
" dropped\n", __func__, sproto));
}
}
NET_EPOCH_EXIT(et);
key_freesav(&sav);
return (error);
}
/*
* See the end of ip6_input for this logic.
* IPPROTO_IPV[46] case will be processed just like other ones
*/
nest = 0;
nxt = nxt8;
while (nxt != IPPROTO_DONE) {
if (V_ip6_hdrnestlimit && (++nest > V_ip6_hdrnestlimit)) {
IP6STAT_INC(ip6s_toomanyhdr);
error = EINVAL;
goto bad;
}
/*
* Protection against faulty packet - there should be
* more sanity checks in header chain processing.
*/
if (m->m_pkthdr.len < skip) {
IP6STAT_INC(ip6s_tooshort);
in6_ifstat_inc(m->m_pkthdr.rcvif, ifs6_in_truncated);
error = EINVAL;
goto bad;
}
/*
* 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 (ipsec6_lasthdr(nxt) && ipsec6_in_reject(m, NULL)) {
error = EINVAL;
goto bad;
}
nxt = ip6_protox[nxt](&m, &skip, nxt);
}
NET_EPOCH_EXIT(et);
key_freesav(&sav);
return (0);
bad:
NET_EPOCH_EXIT(et);
key_freesav(&sav);
if (m)
m_freem(m);
return (error);
}
#endif /* INET6 */
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