#define _IP_VHL
#if (defined(__FreeBSD__) && __FreeBSD__ >= 3) || defined(__NetBSD__)
#include "opt_inet.h"
#endif
#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/time.h>
#include <sys/kernel.h>
#include <sys/syslog.h>
#include <net/if.h>
#include <net/route.h>
#include <net/netisr.h>
#include <kern/cpu_number.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/in_var.h>
#include <netinet/ip.h>
#include <netinet/ip_var.h>
#include <netinet/ip_ecn.h>
#if INET6
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet/icmp6.h>
#endif
#include <netinet6/ipsec.h>
#include <netinet6/ah.h>
#include <netkey/key.h>
#include <netkey/keydb.h>
#include <netkey/key_debug.h>
#include <net/net_osdep.h>
#define IPLEN_FLIPPED
#if INET
extern struct protosw inetsw[];
#if defined(__bsdi__) || defined(__NetBSD__)
extern u_char ip_protox[];
#endif
void
ah4_input(struct mbuf *m, int off)
{
struct ip *ip;
struct ah *ah;
u_int32_t spi;
struct ah_algorithm *algo;
size_t siz;
size_t siz1;
u_char *cksum;
struct secasvar *sav = NULL;
u_int16_t nxt;
size_t hlen;
int s;
#ifndef PULLDOWN_TEST
if (m->m_len < off + sizeof(struct newah)) {
m = m_pullup(m, off + sizeof(struct newah));
if (!m) {
ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup;"
"dropping the packet for simplicity\n"));
ipsecstat.in_inval++;
goto fail;
}
}
ip = mtod(m, struct ip *);
ah = (struct ah *)(((caddr_t)ip) + off);
#else
ip = mtod(m, struct ip *);
IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct newah));
if (ah == NULL) {
ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup;"
"dropping the packet for simplicity\n"));
ipsecstat.in_inval++;
goto fail;
}
#endif
nxt = ah->ah_nxt;
#ifdef _IP_VHL
hlen = IP_VHL_HL(ip->ip_vhl) << 2;
#else
hlen = ip->ip_hl << 2;
#endif
spi = ah->ah_spi;
if ((sav = key_allocsa(AF_INET,
(caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst,
IPPROTO_AH, spi)) == 0) {
ipseclog((LOG_WARNING,
"IPv4 AH input: no key association found for spi %u\n",
(u_int32_t)ntohl(spi)));
ipsecstat.in_nosa++;
goto fail;
}
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ah4_input called to allocate SA:%p\n", sav));
if (sav->state != SADB_SASTATE_MATURE
&& sav->state != SADB_SASTATE_DYING) {
ipseclog((LOG_DEBUG,
"IPv4 AH input: non-mature/dying SA found for spi %u\n",
(u_int32_t)ntohl(spi)));
ipsecstat.in_badspi++;
goto fail;
}
if (sav->alg_auth == SADB_AALG_NONE) {
ipseclog((LOG_DEBUG, "IPv4 AH input: "
"unspecified authentication algorithm for spi %u\n",
(u_int32_t)ntohl(spi)));
ipsecstat.in_badspi++;
goto fail;
}
algo = &ah_algorithms[sav->alg_auth];
siz = (*algo->sumsiz)(sav);
siz1 = ((siz + 3) & ~(4 - 1));
{
int sizoff;
sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
if ((ah->ah_len << 2) - sizoff != siz1) {
ipseclog((LOG_NOTICE, "sum length mismatch in IPv4 AH input "
"(%d should be %u): %s\n",
(ah->ah_len << 2) - sizoff, (unsigned int)siz1,
ipsec4_logpacketstr(ip, spi)));
ipsecstat.in_inval++;
goto fail;
}
#ifndef PULLDOWN_TEST
if (m->m_len < off + sizeof(struct ah) + sizoff + siz1) {
m = m_pullup(m, off + sizeof(struct ah) + sizoff + siz1);
if (!m) {
ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n"));
ipsecstat.in_inval++;
goto fail;
}
ip = mtod(m, struct ip *);
ah = (struct ah *)(((caddr_t)ip) + off);
}
#else
IP6_EXTHDR_GET(ah, struct ah *, m, off,
sizeof(struct ah) + sizoff + siz1);
if (ah == NULL) {
ipseclog((LOG_DEBUG, "IPv4 AH input: can't pullup\n"));
ipsecstat.in_inval++;
goto fail;
}
#endif
}
if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav))
;
else {
ipsecstat.in_ahreplay++;
ipseclog((LOG_WARNING,
"replay packet in IPv4 AH input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
goto fail;
}
}
cksum = _MALLOC(siz1, M_TEMP, M_NOWAIT);
if (!cksum) {
ipseclog((LOG_DEBUG, "IPv4 AH input: "
"couldn't alloc temporary region for cksum\n"));
ipsecstat.in_inval++;
goto fail;
}
{
#if 1
#ifndef __NetBSD__
ip->ip_len = htons(ip->ip_len + hlen);
ip->ip_id = htons(ip->ip_id);
#else
ip->ip_len = htons(ip->ip_len);
#endif
ip->ip_off = htons(ip->ip_off);
#endif
if (ah4_calccksum(m, (caddr_t)cksum, algo, sav)) {
_FREE(cksum, M_TEMP);
ipsecstat.in_inval++;
goto fail;
}
ipsecstat.in_ahhist[sav->alg_auth]++;
#if 1
#ifndef __NetBSD__
ip->ip_len = ntohs(ip->ip_len) - hlen;
ip->ip_id = ntohs(ip->ip_id);
#else
ip->ip_len = ntohs(ip->ip_len);
#endif
ip->ip_off = ntohs(ip->ip_off);
#endif
}
{
caddr_t sumpos = NULL;
if (sav->flags & SADB_X_EXT_OLD) {
sumpos = (caddr_t)(ah + 1);
} else {
sumpos = (caddr_t)(((struct newah *)ah) + 1);
}
if (bcmp(sumpos, cksum, siz) != 0) {
ipseclog((LOG_WARNING,
"checksum mismatch in IPv4 AH input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
_FREE(cksum, M_TEMP);
ipsecstat.in_ahauthfail++;
goto fail;
}
}
_FREE(cksum, M_TEMP);
m->m_flags |= M_AUTHIPHDR;
m->m_flags |= M_AUTHIPDGM;
#if 0
if (ah->ah_nxt == IPPROTO_IPIP || ah->ah_nxt == IPPROTO_IP) {
struct ip *nip;
size_t sizoff;
sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
if (m->m_len < off + sizeof(struct ah) + sizoff + siz1 + hlen) {
m = m_pullup(m, off + sizeof(struct ah)
+ sizoff + siz1 + hlen);
if (!m) {
ipseclog((LOG_DEBUG,
"IPv4 AH input: can't pullup\n"));
ipsecstat.in_inval++;
goto fail;
}
}
nip = (struct ip *)((u_char *)(ah + 1) + sizoff + siz1);
if (nip->ip_src.s_addr != ip->ip_src.s_addr
|| nip->ip_dst.s_addr != ip->ip_dst.s_addr) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
}
}
#if INET6
else if (ah->ah_nxt == IPPROTO_IPV6) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
}
#endif
#endif
if (m->m_flags & M_AUTHIPHDR
&& m->m_flags & M_AUTHIPDGM) {
#if 0
ipseclog((LOG_DEBUG,
"IPv4 AH input: authentication succeess\n"));
#endif
ipsecstat.in_ahauthsucc++;
} else {
ipseclog((LOG_WARNING,
"authentication failed in IPv4 AH input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
ipsecstat.in_ahauthfail++;
goto fail;
}
if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav)) {
ipsecstat.in_ahreplay++;
goto fail;
}
}
if (ipsec4_tunnel_validate(ip, nxt, sav) && nxt == IPPROTO_IPV4) {
size_t stripsiz = 0;
u_int8_t tos;
tos = ip->ip_tos;
if (sav->flags & SADB_X_EXT_OLD) {
stripsiz = sizeof(struct ah) + siz1;
} else {
stripsiz = sizeof(struct newah) + siz1;
}
m_adj(m, off + stripsiz);
if (m->m_len < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (!m) {
ipsecstat.in_inval++;
goto fail;
}
}
ip = mtod(m, struct ip *);
ip_ecn_egress(ip4_ipsec_ecn, &tos, &ip->ip_tos);
if (!key_checktunnelsanity(sav, AF_INET,
(caddr_t)&ip->ip_src, (caddr_t)&ip->ip_dst)) {
ipseclog((LOG_NOTICE, "ipsec tunnel address mismatch "
"in IPv4 AH input: %s %s\n",
ipsec4_logpacketstr(ip, spi), ipsec_logsastr(sav)));
ipsecstat.in_inval++;
goto fail;
}
#if 0
if (ipsec4_in_reject(m, NULL)) {
ipsecstat.in_polvio++;
goto fail;
}
#endif
#if 1
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
#endif
key_sa_recordxfer(sav, m);
s = splimp();
if (IF_QFULL(&ipintrq)) {
ipsecstat.in_inval++;
goto fail;
}
IF_ENQUEUE(&ipintrq, m);
m = NULL;
schednetisr(NETISR_IP);
splx(s);
nxt = IPPROTO_DONE;
} else {
size_t stripsiz = 0;
if (sav->flags & SADB_X_EXT_OLD) {
stripsiz = sizeof(struct ah) + siz1;
} else {
stripsiz = sizeof(struct newah) + siz1;
}
ip = mtod(m, struct ip *);
#ifndef PULLDOWN_TEST
ovbcopy((caddr_t)ip, (caddr_t)(((u_char *)ip) + stripsiz), off);
m->m_data += stripsiz;
m->m_len -= stripsiz;
m->m_pkthdr.len -= stripsiz;
#else
if (m->m_len >= stripsiz + off) {
ovbcopy((caddr_t)ip, ((caddr_t)ip) + stripsiz, off);
m->m_data += stripsiz;
m->m_len -= stripsiz;
m->m_pkthdr.len -= stripsiz;
} else {
struct mbuf *n;
n = m_split(m, off, M_DONTWAIT);
if (n == NULL) {
goto fail;
}
m_adj(n, stripsiz);
m_cat(m, n);
m->m_pkthdr.len += n->m_pkthdr.len;
}
#endif
if (m->m_len < sizeof(*ip)) {
m = m_pullup(m, sizeof(*ip));
if (m == NULL) {
ipsecstat.in_inval++;
goto fail;
}
}
ip = mtod(m, struct ip *);
#ifdef IPLEN_FLIPPED
ip->ip_len = ip->ip_len - stripsiz;
#else
ip->ip_len = htons(ntohs(ip->ip_len) - stripsiz);
#endif
ip->ip_p = nxt;
key_sa_recordxfer(sav, m);
if (nxt != IPPROTO_DONE)
(*ip_protox[nxt]->pr_input)(m, off);
else
m_freem(m);
m = NULL;
}
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ah4_input call free SA:%p\n", sav));
key_freesav(sav);
}
ipsecstat.in_success++;
return;
fail:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ah4_input call free SA:%p\n", sav));
key_freesav(sav);
}
if (m)
m_freem(m);
return;
}
#endif
#if INET6
int
ah6_input(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp;
int off = *offp;
struct ip6_hdr *ip6;
struct ah *ah;
u_int32_t spi;
struct ah_algorithm *algo;
size_t siz;
size_t siz1;
u_char *cksum;
struct secasvar *sav = NULL;
u_int16_t nxt;
int s;
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(struct ah), IPPROTO_DONE);
ah = (struct ah *)(mtod(m, caddr_t) + off);
#else
IP6_EXTHDR_GET(ah, struct ah *, m, off, sizeof(struct newah));
if (ah == NULL) {
ipseclog((LOG_DEBUG, "IPv6 AH input: can't pullup\n"));
ipsecstat.in_inval++;
return IPPROTO_DONE;
}
#endif
ip6 = mtod(m, struct ip6_hdr *);
nxt = ah->ah_nxt;
spi = ah->ah_spi;
if (ntohs(ip6->ip6_plen) == 0) {
ipseclog((LOG_ERR, "IPv6 AH input: "
"AH with IPv6 jumbogram is not supported.\n"));
ipsec6stat.in_inval++;
goto fail;
}
if ((sav = key_allocsa(AF_INET6,
(caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst,
IPPROTO_AH, spi)) == 0) {
ipseclog((LOG_WARNING,
"IPv6 AH input: no key association found for spi %u\n",
(u_int32_t)ntohl(spi)));
ipsec6stat.in_nosa++;
goto fail;
}
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ah6_input called to allocate SA:%p\n", sav));
if (sav->state != SADB_SASTATE_MATURE
&& sav->state != SADB_SASTATE_DYING) {
ipseclog((LOG_DEBUG,
"IPv6 AH input: non-mature/dying SA found for spi %u; ",
(u_int32_t)ntohl(spi)));
ipsec6stat.in_badspi++;
goto fail;
}
if (sav->alg_auth == SADB_AALG_NONE) {
ipseclog((LOG_DEBUG, "IPv6 AH input: "
"unspecified authentication algorithm for spi %u\n",
(u_int32_t)ntohl(spi)));
ipsec6stat.in_badspi++;
goto fail;
}
algo = &ah_algorithms[sav->alg_auth];
siz = (*algo->sumsiz)(sav);
siz1 = ((siz + 3) & ~(4 - 1));
{
int sizoff;
sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
if ((ah->ah_len << 2) - sizoff != siz1) {
ipseclog((LOG_NOTICE, "sum length mismatch in IPv6 AH input "
"(%d should be %u): %s\n",
(ah->ah_len << 2) - sizoff, (unsigned int)siz1,
ipsec6_logpacketstr(ip6, spi)));
ipsec6stat.in_inval++;
goto fail;
}
#ifndef PULLDOWN_TEST
IP6_EXTHDR_CHECK(m, off, sizeof(struct ah) + sizoff + siz1, IPPROTO_DONE);
#else
IP6_EXTHDR_GET(ah, struct ah *, m, off,
sizeof(struct ah) + sizoff + siz1);
if (ah == NULL) {
ipseclog((LOG_NOTICE, "couldn't pullup gather IPv6 AH checksum part"));
ipsecstat.in_inval++;
m = NULL;
goto fail;
}
#endif
}
if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
if (ipsec_chkreplay(ntohl(((struct newah *)ah)->ah_seq), sav))
;
else {
ipsec6stat.in_ahreplay++;
ipseclog((LOG_WARNING,
"replay packet in IPv6 AH input: %s %s\n",
ipsec6_logpacketstr(ip6, spi),
ipsec_logsastr(sav)));
goto fail;
}
}
cksum = _MALLOC(siz1, M_TEMP, M_NOWAIT);
if (!cksum) {
ipseclog((LOG_DEBUG, "IPv6 AH input: "
"couldn't alloc temporary region for cksum\n"));
ipsec6stat.in_inval++;
goto fail;
}
if (ah6_calccksum(m, (caddr_t)cksum, algo, sav)) {
_FREE(cksum, M_TEMP);
ipsec6stat.in_inval++;
goto fail;
}
ipsec6stat.in_ahhist[sav->alg_auth]++;
{
caddr_t sumpos = NULL;
if (sav->flags & SADB_X_EXT_OLD) {
sumpos = (caddr_t)(ah + 1);
} else {
sumpos = (caddr_t)(((struct newah *)ah) + 1);
}
if (bcmp(sumpos, cksum, siz) != 0) {
ipseclog((LOG_WARNING,
"checksum mismatch in IPv6 AH input: %s %s\n",
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
_FREE(cksum, M_TEMP);
ipsec6stat.in_ahauthfail++;
goto fail;
}
}
_FREE(cksum, M_TEMP);
m->m_flags |= M_AUTHIPHDR;
m->m_flags |= M_AUTHIPDGM;
#if 0
if (ah->ah_nxt == IPPROTO_IPV6) {
struct ip6_hdr *nip6;
size_t sizoff;
sizoff = (sav->flags & SADB_X_EXT_OLD) ? 0 : 4;
IP6_EXTHDR_CHECK(m, off, sizeof(struct ah) + sizoff + siz1
+ sizeof(struct ip6_hdr), IPPROTO_DONE);
nip6 = (struct ip6_hdr *)((u_char *)(ah + 1) + sizoff + siz1);
if (!IN6_ARE_ADDR_EQUAL(&nip6->ip6_src, &ip6->ip6_src)
|| !IN6_ARE_ADDR_EQUAL(&nip6->ip6_dst, &ip6->ip6_dst)) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
}
} else if (ah->ah_nxt == IPPROTO_IPIP) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
} else if (ah->ah_nxt == IPPROTO_IP) {
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
}
#endif
if (m->m_flags & M_AUTHIPHDR
&& m->m_flags & M_AUTHIPDGM) {
#if 0
ipseclog((LOG_DEBUG,
"IPv6 AH input: authentication succeess\n"));
#endif
ipsec6stat.in_ahauthsucc++;
} else {
ipseclog((LOG_WARNING,
"authentication failed in IPv6 AH input: %s %s\n",
ipsec6_logpacketstr(ip6, spi), ipsec_logsastr(sav)));
ipsec6stat.in_ahauthfail++;
goto fail;
}
if ((sav->flags & SADB_X_EXT_OLD) == 0 && sav->replay) {
if (ipsec_updatereplay(ntohl(((struct newah *)ah)->ah_seq), sav)) {
ipsec6stat.in_ahreplay++;
goto fail;
}
}
if (ipsec6_tunnel_validate(ip6, nxt, sav) && nxt == IPPROTO_IPV6) {
size_t stripsiz = 0;
u_int32_t flowinfo;
flowinfo = ip6->ip6_flow;
if (sav->flags & SADB_X_EXT_OLD) {
stripsiz = sizeof(struct ah) + siz1;
} else {
stripsiz = sizeof(struct newah) + siz1;
}
m_adj(m, off + stripsiz);
if (m->m_len < sizeof(*ip6)) {
m = m_pullup(m, sizeof(*ip6));
if (!m) {
ipsec6stat.in_inval++;
goto fail;
}
}
ip6 = mtod(m, struct ip6_hdr *);
ip6_ecn_egress(ip6_ipsec_ecn, &flowinfo, &ip6->ip6_flow);
if (!key_checktunnelsanity(sav, AF_INET6,
(caddr_t)&ip6->ip6_src, (caddr_t)&ip6->ip6_dst)) {
ipseclog((LOG_NOTICE, "ipsec tunnel address mismatch "
"in IPv6 AH input: %s %s\n",
ipsec6_logpacketstr(ip6, spi),
ipsec_logsastr(sav)));
ipsec6stat.in_inval++;
goto fail;
}
#if 0
if (ipsec6_in_reject(m, NULL)) {
ipsec6stat.in_polvio++;
goto fail;
}
#endif
#if 1
m->m_flags &= ~M_AUTHIPHDR;
m->m_flags &= ~M_AUTHIPDGM;
#endif
key_sa_recordxfer(sav, m);
s = splimp();
if (IF_QFULL(&ip6intrq)) {
ipsec6stat.in_inval++;
goto fail;
}
IF_ENQUEUE(&ip6intrq, m);
m = NULL;
schednetisr(NETISR_IPV6);
splx(s);
nxt = IPPROTO_DONE;
} else {
size_t stripsiz = 0;
char *prvnxtp;
prvnxtp = ip6_get_prevhdr(m, off);
*prvnxtp = nxt;
if (sav->flags & SADB_X_EXT_OLD) {
stripsiz = sizeof(struct ah) + siz1;
} else {
stripsiz = sizeof(struct newah) + siz1;
}
ip6 = mtod(m, struct ip6_hdr *);
#ifndef PULLDOWN_TEST
ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off);
m->m_data += stripsiz;
m->m_len -= stripsiz;
m->m_pkthdr.len -= stripsiz;
#else
if (m->m_len >= stripsiz + off) {
ovbcopy((caddr_t)ip6, ((caddr_t)ip6) + stripsiz, off);
m->m_data += stripsiz;
m->m_len -= stripsiz;
m->m_pkthdr.len -= stripsiz;
} else {
struct mbuf *n;
n = m_split(m, off, M_DONTWAIT);
if (n == NULL) {
goto fail;
}
m_adj(n, stripsiz);
m_cat(m, n);
m->m_pkthdr.len += n->m_pkthdr.len;
}
#endif
ip6 = mtod(m, struct ip6_hdr *);
ip6->ip6_plen = htons(ntohs(ip6->ip6_plen) - stripsiz);
key_sa_recordxfer(sav, m);
}
*offp = off;
*mp = m;
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ah6_input call free SA:%p\n", sav));
key_freesav(sav);
}
ipsec6stat.in_success++;
return nxt;
fail:
if (sav) {
KEYDEBUG(KEYDEBUG_IPSEC_STAMP,
printf("DP ah6_input call free SA:%p\n", sav));
key_freesav(sav);
}
if (m)
m_freem(m);
return IPPROTO_DONE;
}
#endif