/* * 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. * * $FreeBSD$ */ /* * IPsec controller part. */ #include "opt_inet.h" #include "opt_inet6.h" #include "opt_ipsec.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef INET6 #include #endif #ifdef INET6 #include #include #include #include #endif /*INET6*/ #include #include #ifdef INET6 #include #include #endif #ifdef IPSEC_ESP #include #ifdef INET6 #include #endif #endif #include #include #include #ifdef IPSEC_DEBUG #include #else #define KEYDEBUG(lev,arg) #endif struct ipsecstat ipsecstat; int ip4_inbound_call_ike = 0; int ip4_ah_cleartos = 1; int ip4_ah_offsetmask = 0; /* maybe IP_DF? */ int ip4_ipsec_dfbit = 0; /* DF bit on encap. 0: clear 1: set 2: copy */ int ip4_esp_trans_deflev = IPSEC_LEVEL_USE; int ip4_esp_net_deflev = IPSEC_LEVEL_USE; int ip4_ah_trans_deflev = IPSEC_LEVEL_USE; int ip4_ah_net_deflev = IPSEC_LEVEL_USE; struct secpolicy ip4_def_policy; int ip4_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ /* net.inet.ipsec */ SYSCTL_STRUCT(_net_inet_ipsec, IPSECCTL_STATS, stats, CTLFLAG_RD, &ipsecstat, ipsecstat, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_POLICY, def_policy, CTLFLAG_RW, &ip4_def_policy.policy, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, CTLFLAG_RW, &ip4_esp_trans_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, CTLFLAG_RW, &ip4_esp_net_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, CTLFLAG_RW, &ip4_ah_trans_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, CTLFLAG_RW, &ip4_ah_net_deflev, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_INBOUND_CALL_IKE, inbound_call_ike, CTLFLAG_RW, &ip4_inbound_call_ike, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_CLEARTOS, ah_cleartos, CTLFLAG_RW, &ip4_ah_cleartos, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_AH_OFFSETMASK, ah_offsetmask, CTLFLAG_RW, &ip4_ah_offsetmask, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_DFBIT, dfbit, CTLFLAG_RW, &ip4_ipsec_dfbit, 0, ""); SYSCTL_INT(_net_inet_ipsec, IPSECCTL_ECN, ecn, CTLFLAG_RW, &ip4_ipsec_ecn, 0, ""); #ifdef INET6 struct ipsecstat ipsec6stat; int ip6_inbound_call_ike = 0; int ip6_esp_trans_deflev = IPSEC_LEVEL_USE; int ip6_esp_net_deflev = IPSEC_LEVEL_USE; int ip6_ah_trans_deflev = IPSEC_LEVEL_USE; int ip6_ah_net_deflev = IPSEC_LEVEL_USE; struct secpolicy ip6_def_policy; int ip6_ipsec_ecn = 0; /* ECN ignore(-1)/forbidden(0)/allowed(1) */ /* net.inet6.ipsec6 */ SYSCTL_STRUCT(_net_inet6_ipsec6, IPSECCTL_STATS, stats, CTLFLAG_RD, &ipsec6stat, ipsecstat, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_POLICY, def_policy, CTLFLAG_RW, &ip6_def_policy.policy, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_TRANSLEV, esp_trans_deflev, CTLFLAG_RW, &ip6_esp_trans_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_ESP_NETLEV, esp_net_deflev, CTLFLAG_RW, &ip6_esp_net_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_TRANSLEV, ah_trans_deflev, CTLFLAG_RW, &ip6_ah_trans_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_DEF_AH_NETLEV, ah_net_deflev, CTLFLAG_RW, &ip6_ah_net_deflev, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_INBOUND_CALL_IKE, inbound_call_ike, CTLFLAG_RW, &ip6_inbound_call_ike, 0, ""); SYSCTL_INT(_net_inet6_ipsec6, IPSECCTL_ECN, ecn, CTLFLAG_RW, &ip6_ipsec_ecn, 0, ""); #endif /* INET6 */ static int ipsec_setspidx_mbuf __P((struct secpolicyindex *, u_int, u_int, struct mbuf *)); static void ipsec4_setspidx_inpcb __P((struct mbuf *, struct inpcb *pcb)); static void ipsec4_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); #ifdef INET6 static u_int16_t ipsec6_get_ulp __P((struct mbuf *m)); static void ipsec6_setspidx_in6pcb __P((struct mbuf *, struct in6pcb *pcb)); static void ipsec6_setspidx_ipaddr __P((struct mbuf *, struct secpolicyindex *)); #endif static struct secpolicy *ipsec_deepcopy_policy __P((struct secpolicy *src)); static int ipsec_set_policy __P((struct secpolicy **pcb_sp, int optname, caddr_t request, int priv)); static int ipsec_get_policy __P((struct secpolicy *pcb_sp, struct mbuf **mp)); static void vshiftl __P((unsigned char *, int, int)); static int ipsec_in_reject __P((struct secpolicy *, struct mbuf *)); static size_t ipsec_hdrsiz __P((struct secpolicy *)); static struct mbuf *ipsec4_splithdr __P((struct mbuf *)); #ifdef INET6 static struct mbuf *ipsec6_splithdr __P((struct mbuf *)); #endif static int ipsec4_encapsulate __P((struct mbuf *, struct secasvar *)); #ifdef INET6 static int ipsec6_encapsulate __P((struct mbuf *, struct secasvar *)); #endif #define KMALLOC(p, t, n) \ ((p) = (t) malloc((unsigned long)(n), M_SECA, M_NOWAIT)) #define KFREE(p) \ free((caddr_t)(p), M_SECA); /* * For OUTBOUND packet having a socket. Searching SPD for packet, * and return a pointer to SP. * OUT: NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occured. * others: a pointer to SP * * NOTE: IPv6 mapped adddress concern is implemented here. */ struct secpolicy * ipsec4_getpolicybysock(m, dir, so, error) struct mbuf *m; u_int dir; struct socket *so; int *error; { struct inpcbpolicy *pcbsp = NULL; struct secpolicy *currsp = NULL; /* policy on socket */ struct secpolicy *kernsp = NULL; /* policy on kernel */ /* sanity check */ if (m == NULL || so == NULL || error == NULL) panic("ipsec4_getpolicybysock: NULL pointer was passed.\n"); switch (so->so_proto->pr_domain->dom_family) { case AF_INET: /* set spidx in pcb */ ipsec4_setspidx_inpcb(m, sotoinpcb(so)); pcbsp = sotoinpcb(so)->inp_sp; break; #ifdef INET6 case AF_INET6: /* set spidx in pcb */ ipsec6_setspidx_in6pcb(m, sotoin6pcb(so)); pcbsp = sotoin6pcb(so)->in6p_sp; break; #endif default: panic("ipsec4_getpolicybysock: unsupported address family\n"); } /* sanity check */ if (pcbsp == NULL) panic("ipsec4_getpolicybysock: pcbsp is NULL.\n"); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("send: priv=%d ", pcbsp->priv); if (so->so_cred) printf("cr_uid=%d\n", so->so_cred->cr_uid); ); switch (dir) { case IPSEC_DIR_INBOUND: currsp = pcbsp->sp_in; break; case IPSEC_DIR_OUTBOUND: currsp = pcbsp->sp_out; break; default: panic("ipsec4_getpolicybysock: illegal direction.\n"); } /* sanity check */ if (currsp == NULL) panic("ipsec4_getpolicybysock: currsp is NULL.\n"); /* when privilieged socket */ if (pcbsp->priv) { switch (currsp->policy) { case IPSEC_POLICY_BYPASS: currsp->refcnt++; *error = 0; return currsp; case IPSEC_POLICY_ENTRUST: /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_getpolicybysock called " "to allocate SP:%p\n", kernsp)); *error = 0; return kernsp; } /* no SP found */ if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD && ip4_def_policy.policy != IPSEC_POLICY_NONE) { printf("fixed system default policy:%d->%d\n", ip4_def_policy.policy, IPSEC_POLICY_NONE); ip4_def_policy.policy = IPSEC_POLICY_NONE; } ip4_def_policy.refcnt++; *error = 0; return &ip4_def_policy; case IPSEC_POLICY_IPSEC: currsp->refcnt++; *error = 0; return currsp; default: printf("ipsec4_getpolicybysock: " "Invalid policy for PCB %d\n", currsp->policy); *error = EINVAL; return NULL; } /* NOTREACHED */ } /* when non-privilieged socket */ /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_getpolicybysock called " "to allocate SP:%p\n", kernsp)); *error = 0; return kernsp; } /* no SP found */ switch (currsp->policy) { case IPSEC_POLICY_BYPASS: printf("ipsec4_getpolicybysock: " "Illegal policy for non-priviliged defined %d\n", currsp->policy); *error = EINVAL; return NULL; case IPSEC_POLICY_ENTRUST: if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD && ip4_def_policy.policy != IPSEC_POLICY_NONE) { printf("fixed system default policy:%d->%d\n", ip4_def_policy.policy, IPSEC_POLICY_NONE); ip4_def_policy.policy = IPSEC_POLICY_NONE; } ip4_def_policy.refcnt++; *error = 0; return &ip4_def_policy; case IPSEC_POLICY_IPSEC: currsp->refcnt++; *error = 0; return currsp; default: printf("ipsec4_getpolicybysock: " "Invalid policy for PCB %d\n", currsp->policy); *error = EINVAL; return NULL; } /* NOTREACHED */ } /* * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, * and return a pointer to SP. * OUT: positive: a pointer to the entry for security policy leaf matched. * NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occured. */ struct secpolicy * ipsec4_getpolicybyaddr(m, dir, flag, error) struct mbuf *m; u_int dir; int flag; int *error; { struct secpolicy *sp = NULL; /* sanity check */ if (m == NULL || error == NULL) panic("ipsec4_getpolicybyaddr: NULL pointer was passed.\n"); { struct secpolicyindex spidx; bzero(&spidx, sizeof(spidx)); /* make a index to look for a policy */ if ((flag & IP_FORWARDING) == IP_FORWARDING) { /* Case: IP forwarding */ *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET, m); } else { /* Case: ICMP echo reply */ *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET, m); } if (*error != 0) return NULL; sp = key_allocsp(&spidx, dir); } /* SP found */ if (sp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_getpolicybyaddr called " "to allocate SP:%p\n", sp)); *error = 0; return sp; } /* no SP found */ if (ip4_def_policy.policy != IPSEC_POLICY_DISCARD && ip4_def_policy.policy != IPSEC_POLICY_NONE) { printf("fixed system default policy:%d->%d\n", ip4_def_policy.policy, IPSEC_POLICY_NONE); ip4_def_policy.policy = IPSEC_POLICY_NONE; } ip4_def_policy.refcnt++; *error = 0; return &ip4_def_policy; } #ifdef INET6 /* * For OUTBOUND packet having a socket. Searching SPD for packet, * and return a pointer to SP. * OUT: NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occured. * others: a pointer to SP */ struct secpolicy * ipsec6_getpolicybysock(m, dir, so, error) struct mbuf *m; u_int dir; struct socket *so; int *error; { struct inpcbpolicy *pcbsp = NULL; struct secpolicy *currsp = NULL; /* policy on socket */ struct secpolicy *kernsp = NULL; /* policy on kernel */ /* sanity check */ if (m == NULL || so == NULL || error == NULL) panic("ipsec6_getpolicybysock: NULL pointer was passed.\n"); /* set spidx in pcb */ ipsec6_setspidx_in6pcb(m, sotoin6pcb(so)); pcbsp = sotoin6pcb(so)->in6p_sp; /* sanity check */ if (pcbsp == NULL) panic("ipsec6_getpolicybysock: pcbsp is NULL.\n"); switch (dir) { case IPSEC_DIR_INBOUND: currsp = pcbsp->sp_in; break; case IPSEC_DIR_OUTBOUND: currsp = pcbsp->sp_out; break; default: panic("ipsec6_getpolicybysock: illegal direction.\n"); } /* sanity check */ if (currsp == NULL) panic("ipsec6_getpolicybysock: currsp is NULL.\n"); /* when privilieged socket */ if (pcbsp->priv) { switch (currsp->policy) { case IPSEC_POLICY_BYPASS: currsp->refcnt++; *error = 0; return currsp; case IPSEC_POLICY_ENTRUST: /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_getpolicybysock called " "to allocate SP:%p\n", kernsp)); *error = 0; return kernsp; } /* no SP found */ if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD && ip6_def_policy.policy != IPSEC_POLICY_NONE) { printf("fixed system default policy:%d->%d\n", ip6_def_policy.policy, IPSEC_POLICY_NONE); ip6_def_policy.policy = IPSEC_POLICY_NONE; } ip6_def_policy.refcnt++; *error = 0; return &ip6_def_policy; case IPSEC_POLICY_IPSEC: currsp->refcnt++; *error = 0; return currsp; default: printf("ipsec6_getpolicybysock: " "Invalid policy for PCB %d\n", currsp->policy); *error = EINVAL; return NULL; } /* NOTREACHED */ } /* when non-privilieged socket */ /* look for a policy in SPD */ kernsp = key_allocsp(&currsp->spidx, dir); /* SP found */ if (kernsp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_getpolicybysock called " "to allocate SP:%p\n", kernsp)); *error = 0; return kernsp; } /* no SP found */ switch (currsp->policy) { case IPSEC_POLICY_BYPASS: printf("ipsec6_getpolicybysock: " "Illegal policy for non-priviliged defined %d\n", currsp->policy); *error = EINVAL; return NULL; case IPSEC_POLICY_ENTRUST: if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD && ip6_def_policy.policy != IPSEC_POLICY_NONE) { printf("fixed system default policy:%d->%d\n", ip6_def_policy.policy, IPSEC_POLICY_NONE); ip6_def_policy.policy = IPSEC_POLICY_NONE; } ip6_def_policy.refcnt++; *error = 0; return &ip6_def_policy; case IPSEC_POLICY_IPSEC: currsp->refcnt++; *error = 0; return currsp; default: printf("ipsec6_policybysock: " "Invalid policy for PCB %d\n", currsp->policy); *error = EINVAL; return NULL; } /* NOTREACHED */ } /* * For FORWADING packet or OUTBOUND without a socket. Searching SPD for packet, * and return a pointer to SP. * `flag' means that packet is to be forwarded whether or not. * flag = 1: forwad * OUT: positive: a pointer to the entry for security policy leaf matched. * NULL: no apropreate SP found, the following value is set to error. * 0 : bypass * EACCES : discard packet. * ENOENT : ipsec_acquire() in progress, maybe. * others : error occured. */ #ifndef IP_FORWARDING #define IP_FORWARDING 1 #endif struct secpolicy * ipsec6_getpolicybyaddr(m, dir, flag, error) struct mbuf *m; u_int dir; int flag; int *error; { struct secpolicy *sp = NULL; /* sanity check */ if (m == NULL || error == NULL) panic("ipsec6_getpolicybyaddr: NULL pointer was passed.\n"); { struct secpolicyindex spidx; bzero(&spidx, sizeof(spidx)); /* make a index to look for a policy */ if ((flag & IP_FORWARDING) == IP_FORWARDING) { /* Case: IP forwarding */ *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET6, m); } else { /* Case: ICMP echo reply */ *error = ipsec_setspidx_mbuf(&spidx, dir, AF_INET6, m); } if (*error != 0) return NULL; sp = key_allocsp(&spidx, dir); } /* SP found */ if (sp != NULL) { KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_getpolicybyaddr called " "to allocate SP:%p\n", sp)); *error = 0; return sp; } /* no SP found */ if (ip6_def_policy.policy != IPSEC_POLICY_DISCARD && ip6_def_policy.policy != IPSEC_POLICY_NONE) { printf("fixed system default policy:%d->%d\n", ip6_def_policy.policy, IPSEC_POLICY_NONE); ip6_def_policy.policy = IPSEC_POLICY_NONE; } ip6_def_policy.refcnt++; *error = 0; return &ip6_def_policy; } #endif /* INET6 */ /* * set IP address into spidx from mbuf. * When Forwarding packet and ICMP echo reply, this function is used. * * IN: get the followings from mbuf. * protocol family, src, dst, next protocol * OUT: * 0: success. * other: failure, and set errno. */ int ipsec_setspidx_mbuf(spidx, dir, family, m) struct secpolicyindex *spidx; u_int dir, family; struct mbuf *m; { /* sanity check */ if (spidx == NULL || m == NULL) panic("ipsec_setspidx_mbuf: NULL pointer was passed.\n"); KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx_mbuf: begin\n"); kdebug_mbuf(m)); /* initialize */ bzero(spidx, sizeof(*spidx)); spidx->dir = dir; spidx->src.ss_len = spidx->dst.ss_len = _SALENBYAF(family); spidx->src.ss_family = spidx->dst.ss_family = family; spidx->prefs = spidx->prefd = _INALENBYAF(family) << 3; { /* sanity check for packet length. */ struct mbuf *n; int tlen; tlen = 0; for (n = m; n; n = n->m_next) tlen += n->m_len; if (m->m_pkthdr.len != tlen) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx_mbuf: " "total of m_len(%d) != pkthdr.len(%d), " "ignored.\n", tlen, m->m_pkthdr.len)); goto bad; } } switch (family) { case AF_INET: { struct ip *ip; struct ip ipbuf; /* sanity check 1 for minimum ip header length */ if (m->m_pkthdr.len < sizeof(struct ip)) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx_mbuf: " "pkthdr.len(%d) < sizeof(struct ip), " "ignored.\n", m->m_pkthdr.len)); goto bad; } /* * get IPv4 header packet. usually the mbuf is contiguous * and we need no copies. */ if (m->m_len >= sizeof(*ip)) ip = mtod(m, struct ip *); else { m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); ip = &ipbuf; } /* some more checks on IPv4 header. */ bcopy(&ip->ip_src, _INADDRBYSA(&spidx->src), sizeof(ip->ip_src)); bcopy(&ip->ip_dst, _INADDRBYSA(&spidx->dst), sizeof(ip->ip_dst)); spidx->ul_proto = ip->ip_p; _INPORTBYSA(&spidx->src) = IPSEC_PORT_ANY; _INPORTBYSA(&spidx->dst) = IPSEC_PORT_ANY; break; } #ifdef INET6 case AF_INET6: { struct ip6_hdr *ip6_hdr; struct ip6_hdr ip6buf; /* sanity check 1 for minimum ip header length */ if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx_mbuf: " "pkthdr.len(%d) < sizeof(struct ip6_hdr), " "ignored.\n", m->m_pkthdr.len)); goto bad; } /* * get IPv6 header packet. usually the mbuf is contiguous * and we need no copies. */ if (m->m_len >= sizeof(*ip6_hdr)) ip6_hdr = mtod(m, struct ip6_hdr *); else { m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); ip6_hdr = &ip6buf; } /* some more checks on IPv4 header. */ if ((ip6_hdr->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx_mbuf: " "wrong ip version on packet " "(expected IPv6), ignored.\n")); goto bad; } bcopy(&ip6_hdr->ip6_src, _INADDRBYSA(&spidx->src), sizeof(ip6_hdr->ip6_src)); bcopy(&ip6_hdr->ip6_dst, _INADDRBYSA(&spidx->dst), sizeof(ip6_hdr->ip6_dst)); spidx->ul_proto = ipsec6_get_ulp(m); _INPORTBYSA(&spidx->src) = IPSEC_PORT_ANY; _INPORTBYSA(&spidx->dst) = IPSEC_PORT_ANY; break; } #endif /* INET6 */ default: panic("ipsec_secsecidx: no supported family passed.\n"); } KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx_mbuf: end\n"); kdebug_secpolicyindex(spidx)); return 0; bad: /* XXX initialize */ bzero(spidx, sizeof(*spidx)); return EINVAL; } #ifdef INET6 /* * Get the number of upper layer protocol. * Assumed all extension headers are in single mbuf. */ static u_int16_t ipsec6_get_ulp(m) struct mbuf *m; { struct ip6_hdr *ip6; struct ip6_ext *ip6e; int off, nxt; int len; /* sanity check */ if (m == NULL) panic("ipsec6_get_ulp: NULL pointer was passed.\n"); KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec6_get_ulp:\n"); kdebug_mbuf(m)); ip6 = mtod(m, struct ip6_hdr *); nxt = ip6->ip6_nxt; off = sizeof(struct ip6_hdr); len = m->m_len; while (off < len) { ip6e = (struct ip6_ext *)((caddr_t) ip6 + off); if (m->m_len < off + sizeof(*ip6e)) { printf("ipsec6_get_ulp: all exthdr are not " "in single mbuf.\n"); return IPSEC_PORT_ANY; } switch(nxt) { case IPPROTO_TCP: case IPPROTO_UDP: case IPPROTO_ICMPV6: return nxt; case IPPROTO_FRAGMENT: off += sizeof(struct ip6_frag); break; case IPPROTO_AH: off += (ip6e->ip6e_len + 2) << 2; break; default: switch (nxt) { case IPPROTO_HOPOPTS: case IPPROTO_ROUTING: case IPPROTO_ESP: case IPPROTO_NONE: case IPPROTO_DSTOPTS: break; default: return nxt; /* XXX */ } off += (ip6e->ip6e_len + 1) << 3; break; } nxt = ip6e->ip6e_nxt; } return IPSEC_PORT_ANY; } #endif static void ipsec4_setspidx_inpcb(m, pcb) struct mbuf *m; struct inpcb *pcb; { struct secpolicyindex *spidx; /* sanity check */ if (pcb == NULL) panic("ipsec4_setspidx_inpcb: no PCB found.\n"); if (pcb->inp_sp == NULL) panic("ipsec4_setspidx_inpcb: no inp_sp found.\n"); if (pcb->inp_sp->sp_out ==NULL || pcb->inp_sp->sp_in == NULL) panic("ipsec4_setspidx_inpcb: no sp_in/out found.\n"); bzero(&pcb->inp_sp->sp_in->spidx, sizeof(*spidx)); bzero(&pcb->inp_sp->sp_out->spidx, sizeof(*spidx)); spidx = &pcb->inp_sp->sp_in->spidx; spidx->dir = IPSEC_DIR_INBOUND; spidx->src.ss_len = spidx->dst.ss_len = _SALENBYAF(AF_INET); spidx->src.ss_family = spidx->dst.ss_family = AF_INET; spidx->prefs = _INALENBYAF(AF_INET) << 3; spidx->prefd = _INALENBYAF(AF_INET) << 3; spidx->ul_proto = pcb->inp_socket->so_proto->pr_protocol; _INPORTBYSA(&spidx->src) = pcb->inp_fport; _INPORTBYSA(&spidx->dst) = pcb->inp_lport; ipsec4_setspidx_ipaddr(m, spidx); spidx = &pcb->inp_sp->sp_out->spidx; spidx->dir = IPSEC_DIR_OUTBOUND; spidx->src.ss_len = spidx->dst.ss_len = _SALENBYAF(AF_INET); spidx->src.ss_family = spidx->dst.ss_family = AF_INET; spidx->prefs = _INALENBYAF(AF_INET) << 3; spidx->prefd = _INALENBYAF(AF_INET) << 3; spidx->ul_proto = pcb->inp_socket->so_proto->pr_protocol; _INPORTBYSA(&spidx->src) = pcb->inp_lport; _INPORTBYSA(&spidx->dst) = pcb->inp_fport; ipsec4_setspidx_ipaddr(m, spidx); return; } static void ipsec4_setspidx_ipaddr(m, spidx) struct mbuf *m; struct secpolicyindex *spidx; { struct ip *ip = NULL; /* sanity check 1 for minimum ip header length */ if (m == NULL) panic("ipsec4_setspidx_in6pcb: m == 0 passed.\n"); if (m->m_pkthdr.len < sizeof(struct ip)) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec4_setspidx_ipaddr: " "pkthdr.len(%d) < sizeof(struct ip), " "ignored.\n", m->m_pkthdr.len)); return; } if (m->m_len >= sizeof(*ip)) ip = mtod(m, struct ip *); else { struct ip ipbuf; m_copydata(m, 0, sizeof(ipbuf), (caddr_t)&ipbuf); ip = &ipbuf; } bcopy(&ip->ip_src, _INADDRBYSA(&spidx->src), sizeof(ip->ip_src)); bcopy(&ip->ip_dst, _INADDRBYSA(&spidx->dst), sizeof(ip->ip_dst)); return; } #ifdef INET6 static void ipsec6_setspidx_in6pcb(m, pcb) struct mbuf *m; struct in6pcb *pcb; { struct secpolicyindex *spidx; /* sanity check */ if (pcb == NULL) panic("ipsec6_setspidx_in6pcb: no PCB found.\n"); if (pcb->in6p_sp == NULL) panic("ipsec6_setspidx_in6pcb: no in6p_sp found.\n"); if (pcb->in6p_sp->sp_out ==NULL || pcb->in6p_sp->sp_in == NULL) panic("ipsec6_setspidx_in6pcb: no sp_in/out found.\n"); bzero(&pcb->in6p_sp->sp_in->spidx, sizeof(*spidx)); bzero(&pcb->in6p_sp->sp_out->spidx, sizeof(*spidx)); spidx = &pcb->in6p_sp->sp_in->spidx; spidx->dir = IPSEC_DIR_INBOUND; spidx->src.ss_len = spidx->dst.ss_len = _SALENBYAF(AF_INET6); spidx->src.ss_family = spidx->dst.ss_family = AF_INET6; spidx->prefs = _INALENBYAF(AF_INET6) << 3; spidx->prefd = _INALENBYAF(AF_INET6) << 3; spidx->ul_proto = pcb->in6p_socket->so_proto->pr_protocol; _INPORTBYSA(&spidx->src) = pcb->in6p_fport; _INPORTBYSA(&spidx->dst) = pcb->in6p_lport; ipsec6_setspidx_ipaddr(m, spidx); spidx = &pcb->in6p_sp->sp_out->spidx; spidx->dir = IPSEC_DIR_OUTBOUND; spidx->src.ss_len = spidx->dst.ss_len = _SALENBYAF(AF_INET6); spidx->src.ss_family = spidx->dst.ss_family = AF_INET6; spidx->prefs = _INALENBYAF(AF_INET6) << 3; spidx->prefd = _INALENBYAF(AF_INET6) << 3; spidx->ul_proto = pcb->in6p_socket->so_proto->pr_protocol; _INPORTBYSA(&spidx->src) = pcb->in6p_lport; _INPORTBYSA(&spidx->dst) = pcb->in6p_fport; ipsec6_setspidx_ipaddr(m, spidx); return; } static void ipsec6_setspidx_ipaddr(m, spidx) struct mbuf *m; struct secpolicyindex *spidx; { struct ip6_hdr *ip6_hdr = NULL; /* sanity check 1 for minimum ip header length */ if (m == NULL) panic("ipsec6_setspidx_in6pcb: m == 0 passed.\n"); if (m->m_pkthdr.len < sizeof(struct ip6_hdr)) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec6_setspidx_ipaddr: " "pkthdr.len(%d) < sizeof(struct ip6_hdr), " "ignored.\n", m->m_pkthdr.len)); return; } if (m->m_len >= sizeof(*ip6_hdr)) ip6_hdr = mtod(m, struct ip6_hdr *); else { struct ip6_hdr ip6buf; m_copydata(m, 0, sizeof(ip6buf), (caddr_t)&ip6buf); ip6_hdr = &ip6buf; } if ((ip6_hdr->ip6_vfc & IPV6_VERSION_MASK) != IPV6_VERSION) { KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_setspidx_mbuf: " "wrong ip version on packet " "(expected IPv6), ignored.\n")); return; } bcopy(&ip6_hdr->ip6_src, _INADDRBYSA(&spidx->src), sizeof(ip6_hdr->ip6_src)); bcopy(&ip6_hdr->ip6_dst, _INADDRBYSA(&spidx->dst), sizeof(ip6_hdr->ip6_dst)); return; } #endif /* initialize policy in PCB */ int ipsec_init_policy(so, pcb_sp) struct socket *so; struct inpcbpolicy **pcb_sp; { struct inpcbpolicy *new; /* sanity check. */ if (so == NULL || pcb_sp == NULL) panic("ipsec_init_policy: NULL pointer was passed.\n"); KMALLOC(new, struct inpcbpolicy *, sizeof(*new)); if (new == NULL) { printf("ipsec_init_policy: No more memory.\n"); return ENOBUFS; } bzero(new, sizeof(*new)); if (so->so_cred != 0 && so->so_cred->cr_uid == 0) new->priv = 1; else new->priv = 0; KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("init: priv=%d ", new->priv); if (so->so_cred) printf("cr_uid=%d\n", so->so_cred->cr_uid); else printf("so_cred is NULL\n"); ); if ((new->sp_in = key_newsp()) == NULL) { KFREE(new); return ENOBUFS; } new->sp_in->state = IPSEC_SPSTATE_ALIVE; new->sp_in->policy = IPSEC_POLICY_ENTRUST; if ((new->sp_out = key_newsp()) == NULL) { key_freesp(new->sp_in); KFREE(new); return ENOBUFS; } new->sp_out->state = IPSEC_SPSTATE_ALIVE; new->sp_out->policy = IPSEC_POLICY_ENTRUST; *pcb_sp = new; return 0; } /* copy old ipsec policy into new */ int ipsec_copy_policy(old, new) struct inpcbpolicy *old, *new; { struct secpolicy *sp; sp = ipsec_deepcopy_policy(old->sp_in); if (sp) { key_freesp(new->sp_in); new->sp_in = sp; } else return ENOBUFS; sp = ipsec_deepcopy_policy(old->sp_out); if (sp) { key_freesp(new->sp_out); new->sp_out = sp; } else return ENOBUFS; new->priv = old->priv; return 0; } /* deep-copy a policy in PCB */ static struct secpolicy * ipsec_deepcopy_policy(src) struct secpolicy *src; { struct ipsecrequest *newchain = NULL; struct ipsecrequest *p; struct ipsecrequest **q; struct ipsecrequest *r; struct secpolicy *dst; dst = key_newsp(); if (src == NULL || dst == NULL) return NULL; /* * deep-copy IPsec request chain. This is required since struct * ipsecrequest is not reference counted. */ q = &newchain; for (p = src->req; p; p = p->next) { KMALLOC(*q, struct ipsecrequest *, sizeof(struct ipsecrequest)); if (*q == NULL) goto fail; bzero(*q, sizeof(**q)); (*q)->next = NULL; (*q)->saidx.proto = p->saidx.proto; (*q)->saidx.mode = p->saidx.mode; (*q)->level = p->level; bcopy(&p->saidx.src, &(*q)->saidx.src, sizeof((*q)->saidx.src)); bcopy(&p->saidx.dst, &(*q)->saidx.dst, sizeof((*q)->saidx.dst)); (*q)->sav = NULL; (*q)->sp = dst; q = &((*q)->next); } dst->req = newchain; dst->state = src->state; dst->policy = src->policy; /* do not touch the refcnt fields */ return dst; fail: for (p = newchain; p; p = r) { r = p->next; KFREE(p); p = NULL; } return NULL; } /* set policy and ipsec request if present. */ static int ipsec_set_policy(pcb_sp, optname, request, priv) struct secpolicy **pcb_sp; int optname; caddr_t request; int priv; { struct sadb_x_policy *xpl = (struct sadb_x_policy *)request; struct secpolicy *newsp = NULL; /* sanity check. */ if (pcb_sp == NULL || *pcb_sp == NULL || xpl == NULL) return EINVAL; KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_set_policy: passed policy\n"); kdebug_sadb_x_policy((struct sadb_ext *)xpl)); /* check policy type */ /* ipsec_set_policy() accepts IPSEC, ENTRUST and BYPASS. */ if (xpl->sadb_x_policy_type == IPSEC_POLICY_DISCARD || xpl->sadb_x_policy_type == IPSEC_POLICY_NONE) return EINVAL; /* check privileged socket */ if (priv == 0 && xpl->sadb_x_policy_type == IPSEC_POLICY_BYPASS) return EACCES; /* allocation new SP entry */ if ((newsp = key_msg2sp(xpl)) == NULL) return EINVAL; /* maybe ENOBUFS */ newsp->state = IPSEC_SPSTATE_ALIVE; /* clear old SP and set new SP */ key_freesp(*pcb_sp); *pcb_sp = newsp; KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_set_policy: new policy\n"); kdebug_secpolicy(newsp)); return 0; } static int ipsec_get_policy(pcb_sp, mp) struct secpolicy *pcb_sp; struct mbuf **mp; { struct sadb_x_policy *xpl; /* sanity check. */ if (pcb_sp == NULL || mp == NULL) return EINVAL; if ((xpl = key_sp2msg(pcb_sp)) == NULL) { printf("ipsec_get_policy: No more memory.\n"); return ENOBUFS; } *mp = m_get(M_WAIT, MT_DATA); (*mp)->m_len = PFKEY_EXTLEN(xpl); m_copyback((*mp), 0, PFKEY_EXTLEN(xpl), (caddr_t)xpl); KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_get_policy:\n"); kdebug_mbuf(*mp)); KFREE(xpl); return 0; } int ipsec4_set_policy(inp, optname, request, priv) struct inpcb *inp; int optname; caddr_t request; int priv; { struct sadb_x_policy *xpl = (struct sadb_x_policy *)request; struct secpolicy **pcb_sp; /* sanity check. */ if (inp == NULL || request == NULL) return EINVAL; /* select direction */ switch (xpl->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: pcb_sp = &inp->inp_sp->sp_in; break; case IPSEC_DIR_OUTBOUND: pcb_sp = &inp->inp_sp->sp_out; break; default: printf("ipsec4_set_policy: invalid direction=%u\n", xpl->sadb_x_policy_dir); return EINVAL; } return ipsec_set_policy(pcb_sp, optname, request, priv); } int ipsec4_get_policy(inp, request, mp) struct inpcb *inp; caddr_t request; struct mbuf **mp; { struct sadb_x_policy *xpl = (struct sadb_x_policy *)request; struct secpolicy *pcb_sp; /* sanity check. */ if (inp == NULL || request == NULL || mp == NULL) return EINVAL; /* select direction */ switch (xpl->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: pcb_sp = inp->inp_sp->sp_in; break; case IPSEC_DIR_OUTBOUND: pcb_sp = inp->inp_sp->sp_out; break; default: printf("ipsec6_set_policy: invalid direction=%u\n", xpl->sadb_x_policy_dir); return EINVAL; } return ipsec_get_policy(pcb_sp, mp); } /* delete policy in PCB */ int ipsec4_delete_pcbpolicy(inp) struct inpcb *inp; { /* sanity check. */ if (inp == NULL) panic("ipsec4_delete_pcbpolicy: NULL pointer was passed.\n"); if (inp->inp_sp->sp_in != NULL) { key_freesp(inp->inp_sp->sp_in); inp->inp_sp->sp_in = NULL; } if (inp->inp_sp->sp_out != NULL) { key_freesp(inp->inp_sp->sp_out); inp->inp_sp->sp_out = NULL; } KFREE(inp->inp_sp); inp->inp_sp = NULL; return 0; } #ifdef INET6 int ipsec6_set_policy(in6p, optname, request, priv) struct in6pcb *in6p; int optname; caddr_t request; int priv; { struct sadb_x_policy *xpl = (struct sadb_x_policy *)request; struct secpolicy **pcb_sp; /* sanity check. */ if (in6p == NULL || request == NULL) return EINVAL; /* select direction */ switch (xpl->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: pcb_sp = &in6p->in6p_sp->sp_in; break; case IPSEC_DIR_OUTBOUND: pcb_sp = &in6p->in6p_sp->sp_out; break; default: printf("ipsec6_set_policy: invalid direction=%u\n", xpl->sadb_x_policy_dir); return EINVAL; } return ipsec_set_policy(pcb_sp, optname, request, priv); } int ipsec6_get_policy(in6p, request, mp) struct in6pcb *in6p; caddr_t request; struct mbuf **mp; { struct sadb_x_policy *xpl = (struct sadb_x_policy *)request; struct secpolicy *pcb_sp; /* sanity check. */ if (in6p == NULL || request == NULL || mp == NULL) return EINVAL; /* select direction */ switch (xpl->sadb_x_policy_dir) { case IPSEC_DIR_INBOUND: pcb_sp = in6p->in6p_sp->sp_in; break; case IPSEC_DIR_OUTBOUND: pcb_sp = in6p->in6p_sp->sp_out; break; default: printf("ipsec6_set_policy: invalid direction=%u\n", xpl->sadb_x_policy_dir); return EINVAL; } return ipsec_get_policy(pcb_sp, mp); } int ipsec6_delete_pcbpolicy(in6p) struct in6pcb *in6p; { /* sanity check. */ if (in6p == NULL) panic("ipsec6_delete_pcbpolicy: NULL pointer was passed.\n"); if (in6p->in6p_sp->sp_in != NULL) { key_freesp(in6p->in6p_sp->sp_in); in6p->in6p_sp->sp_in = NULL; } if (in6p->in6p_sp->sp_out != NULL) { key_freesp(in6p->in6p_sp->sp_out); in6p->in6p_sp->sp_out = NULL; } KFREE(in6p->in6p_sp); in6p->in6p_sp = NULL; return 0; } #endif /* * return current level. * IPSEC_LEVEL_USE or IPSEC_LEVEL_REQUIRE are always returned. */ u_int ipsec_get_reqlevel(isr) struct ipsecrequest *isr; { u_int level = 0; u_int esp_trans_deflev, esp_net_deflev, ah_trans_deflev, ah_net_deflev; /* sanity check */ if (isr == NULL || isr->sp == NULL) panic("ipsec_get_reqlevel: NULL pointer is passed.\n"); if (isr->sp->spidx.src.ss_family != isr->sp->spidx.dst.ss_family) panic("ipsec_get_reqlevel: family mismatched.\n"); #define IPSEC_CHECK_DEFAULT(lev) \ (((lev) != IPSEC_LEVEL_USE && (lev) != IPSEC_LEVEL_REQUIRE) \ ? (printf("fixed system default level " #lev ":%d->%d\n", \ (lev), IPSEC_LEVEL_USE), \ (lev) = IPSEC_LEVEL_USE) : (lev)) /* set default level */ switch (isr->sp->spidx.src.ss_family) { #ifdef INET case AF_INET: esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_trans_deflev); esp_net_deflev = IPSEC_CHECK_DEFAULT(ip4_esp_net_deflev); ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_trans_deflev); ah_net_deflev = IPSEC_CHECK_DEFAULT(ip4_ah_net_deflev); break; #endif #ifdef INET6 case AF_INET6: esp_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_trans_deflev); esp_net_deflev = IPSEC_CHECK_DEFAULT(ip6_esp_net_deflev); ah_trans_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_trans_deflev); ah_net_deflev = IPSEC_CHECK_DEFAULT(ip6_ah_net_deflev); break; #endif /* INET6 */ default: panic("key_get_reqlevel: Unknown family. %d\n", isr->sp->spidx.src.ss_family); } #undef IPSEC_CHECK_DEFAULT(lev) /* set level */ switch (isr->level) { case IPSEC_LEVEL_DEFAULT: switch (isr->saidx.proto) { case IPPROTO_ESP: if (isr->saidx.mode == IPSEC_MODE_TUNNEL) level = esp_net_deflev; else level = esp_trans_deflev; break; case IPPROTO_AH: if (isr->saidx.mode == IPSEC_MODE_TUNNEL) level = ah_net_deflev; else level = ah_trans_deflev; default: panic("ipsec_get_reqlevel: " "Illegal protocol defined %u\n", isr->saidx.proto); } break; case IPSEC_LEVEL_USE: case IPSEC_LEVEL_REQUIRE: level = isr->level; break; default: panic("ipsec_get_reqlevel: Illegal IPsec level %u\n", isr->level); } return level; } /* * Check AH/ESP integrity. * OUT: * 0: valid * 1: invalid */ static int ipsec_in_reject(sp, m) struct secpolicy *sp; struct mbuf *m; { struct ipsecrequest *isr; u_int level; int need_auth, need_conf, need_icv; KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec_in_reject: using SP\n"); kdebug_secpolicy(sp)); /* check policy */ switch (sp->policy) { case IPSEC_POLICY_DISCARD: return 1; case IPSEC_POLICY_BYPASS: case IPSEC_POLICY_NONE: return 0; case IPSEC_POLICY_IPSEC: break; case IPSEC_POLICY_ENTRUST: default: panic("ipsec_hdrsiz: Invalid policy found. %d\n", sp->policy); } need_auth = 0; need_conf = 0; need_icv = 0; for (isr = sp->req; isr != NULL; isr = isr->next) { /* get current level */ level = ipsec_get_reqlevel(isr); switch (isr->saidx.proto) { case IPPROTO_ESP: if (level == IPSEC_LEVEL_REQUIRE) { need_conf++; if (isr->sav != NULL && isr->sav->flags == SADB_X_EXT_NONE && isr->sav->alg_auth != SADB_AALG_NONE) need_icv++; } break; case IPPROTO_AH: if (level == IPSEC_LEVEL_REQUIRE) { need_auth++; need_icv++; } break; } } KEYDEBUG(KEYDEBUG_IPSEC_DUMP, printf("ipsec_in_reject: auth:%d conf:%d icv:%d m_flags:%x\n", need_auth, need_conf, need_icv, m->m_flags)); if ((need_conf && !(m->m_flags & M_DECRYPTED)) || (!need_auth && need_icv && !(m->m_flags & M_AUTHIPDGM)) || (need_auth && !(m->m_flags & M_AUTHIPHDR))) return 1; return 0; } /* * Check AH/ESP integrity. * This function is called from tcp_input(), udp_input(), * and {ah,esp}4_input for tunnel mode */ int ipsec4_in_reject_so(m, so) struct mbuf *m; struct socket *so; { struct secpolicy *sp = NULL; int error; int result; /* sanity check */ if (m == NULL) return 0; /* XXX should be panic ? */ /* get SP for this packet. * When we are called from ip_forward(), we call * ipsec4_getpolicybyaddr() with IP_FORWARDING flag. */ if (so == NULL) sp = ipsec4_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); else sp = ipsec4_getpolicybysock(m, IPSEC_DIR_INBOUND, so, &error); if (sp == NULL) return 0; /* XXX should be panic ? * -> No, there may be error. */ result = ipsec_in_reject(sp, m); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_in_reject_so call free SP:%p\n", sp)); key_freesp(sp); return result; } int ipsec4_in_reject(m, inp) struct mbuf *m; struct inpcb *inp; { if (inp == NULL) return ipsec4_in_reject_so(m, NULL); else { if (inp->inp_socket) return ipsec4_in_reject_so(m, inp->inp_socket); else panic("ipsec4_in_reject: invalid inpcb/socket"); } } #ifdef INET6 /* * Check AH/ESP integrity. * This function is called from tcp6_input(), udp6_input(), * and {ah,esp}6_input for tunnel mode */ int ipsec6_in_reject_so(m, so) struct mbuf *m; struct socket *so; { struct secpolicy *sp = NULL; int error; int result; /* sanity check */ if (m == NULL) return 0; /* XXX should be panic ? */ /* get SP for this packet. * When we are called from ip_forward(), we call * ipsec6_getpolicybyaddr() with IP_FORWARDING flag. */ if (so == NULL) sp = ipsec6_getpolicybyaddr(m, IPSEC_DIR_INBOUND, IP_FORWARDING, &error); else sp = ipsec6_getpolicybysock(m, IPSEC_DIR_INBOUND, so, &error); if (sp == NULL) return 0; /* XXX should be panic ? */ result = ipsec_in_reject(sp, m); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_in_reject_so call free SP:%p\n", sp)); key_freesp(sp); return result; } int ipsec6_in_reject(m, in6p) struct mbuf *m; struct in6pcb *in6p; { if (in6p == NULL) return ipsec6_in_reject_so(m, NULL); else { if (in6p->in6p_socket) return ipsec6_in_reject_so(m, in6p->in6p_socket); else panic("ipsec6_in_reject: invalid in6p/socket"); } } #endif /* * compute the byte size to be occupied by IPsec header. * in case it is tunneled, it includes the size of outer IP header. * NOTE: SP passed is free in this function. */ static size_t ipsec_hdrsiz(sp) struct secpolicy *sp; { struct ipsecrequest *isr; size_t siz, clen; KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec_in_reject: using SP\n"); kdebug_secpolicy(sp)); /* check policy */ switch (sp->policy) { case IPSEC_POLICY_DISCARD: case IPSEC_POLICY_BYPASS: case IPSEC_POLICY_NONE: return 0; case IPSEC_POLICY_IPSEC: break; case IPSEC_POLICY_ENTRUST: default: panic("ipsec_hdrsiz: Invalid policy found. %d\n", sp->policy); } siz = 0; for (isr = sp->req; isr != NULL; isr = isr->next) { clen = 0; switch (isr->saidx.proto) { case IPPROTO_ESP: #ifdef IPSEC_ESP clen = esp_hdrsiz(isr); #else clen = 0; /*XXX*/ #endif break; case IPPROTO_AH: clen = ah_hdrsiz(isr); break; } if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { switch (isr->saidx.dst.ss_family) { case AF_INET: clen += sizeof(struct ip); break; #ifdef INET6 case AF_INET6: clen += sizeof(struct ip6_hdr); break; #endif default: printf("ipsec_hdrsiz: unknown AF %d " "in IPsec tunnel SA\n", isr->saidx.dst.ss_family); break; } } siz += clen; } return siz; } /* This function is called from ip_forward() and ipsec4_hdrsize_tcp(). */ size_t ipsec4_hdrsiz(m, dir, inp) struct mbuf *m; u_int dir; struct inpcb *inp; { struct secpolicy *sp = NULL; int error; size_t size; /* sanity check */ if (m == NULL) return 0; /* XXX should be panic ? */ if (inp != NULL && inp->inp_socket == NULL) panic("ipsec4_hdrsize: why is socket NULL but there is PCB."); /* get SP for this packet. * When we are called from ip_forward(), we call * ipsec4_getpolicybyaddr() with IP_FORWARDING flag. */ if (inp == NULL) sp = ipsec4_getpolicybyaddr(m, dir, IP_FORWARDING, &error); else sp = ipsec4_getpolicybysock(m, dir, inp->inp_socket, &error); if (sp == NULL) return 0; /* XXX should be panic ? */ size = ipsec_hdrsiz(sp); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec4_hdrsiz call free SP:%p\n", sp)); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec4_hdrsiz: size:%lu.\n", (unsigned long)size)); key_freesp(sp); return size; } #ifdef INET6 /* This function is called from ipsec6_hdrsize_tcp(), * and maybe from ip6_forward.() */ size_t ipsec6_hdrsiz(m, dir, in6p) struct mbuf *m; u_int dir; struct in6pcb *in6p; { struct secpolicy *sp = NULL; int error; size_t size; /* sanity check */ if (m == NULL) return 0; /* XXX shoud be panic ? */ if (in6p != NULL && in6p->in6p_socket == NULL) panic("ipsec6_hdrsize: why is socket NULL but there is PCB."); /* get SP for this packet */ /* XXX Is it right to call with IP_FORWARDING. */ if (in6p == NULL) sp = ipsec6_getpolicybyaddr(m, dir, IP_FORWARDING, &error); else sp = ipsec6_getpolicybysock(m, dir, in6p->in6p_socket, &error); if (sp == NULL) return 0; size = ipsec_hdrsiz(sp); KEYDEBUG(KEYDEBUG_IPSEC_STAMP, printf("DP ipsec6_hdrsiz call free SP:%p\n", sp)); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec6_hdrsiz: size:%lu.\n", (unsigned long)size)); key_freesp(sp); return size; } #endif /*INET6*/ #ifdef INET /* * encapsulate for ipsec tunnel. * ip->ip_src must be fixed later on. */ static int ipsec4_encapsulate(m, sav) struct mbuf *m; struct secasvar *sav; { struct ip *oip; struct ip *ip; size_t hlen; size_t plen; /* can't tunnel between different AFs */ if (sav->sah->saidx.src.ss_family != sav->sah->saidx.dst.ss_family || sav->sah->saidx.src.ss_family != AF_INET) { m_freem(m); return EINVAL; } ip = mtod(m, struct ip *); #ifdef _IP_VHL hlen = _IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif /* generate header checksum */ ip->ip_sum = 0; #ifdef _IP_VHL if (ip->ip_vhl == IP_VHL_BORING) ip->ip_sum = in_cksum_hdr(ip); else ip->ip_sum = in_cksum(m, hlen); #else ip->ip_sum = in_cksum(m, hlen); #endif plen = m->m_pkthdr.len; /* * grow the mbuf to accomodate the new IPv4 header. * NOTE: IPv4 options will never be copied. */ if (m->m_len != hlen) panic("ipsec4_encapsulate: assumption failed (first mbuf length)"); if (M_LEADINGSPACE(m->m_next) < hlen) { struct mbuf *n; MGET(n, M_DONTWAIT, MT_DATA); if (!n) { m_freem(m); return ENOBUFS; } n->m_len = hlen; n->m_next = m->m_next; m->m_next = n; m->m_pkthdr.len += hlen; oip = mtod(n, struct ip *); } else { m->m_next->m_len += hlen; m->m_next->m_data -= hlen; m->m_pkthdr.len += hlen; oip = mtod(m->m_next, struct ip *); } ip = mtod(m, struct ip *); ovbcopy((caddr_t)ip, (caddr_t)oip, hlen); m->m_len = sizeof(struct ip); m->m_pkthdr.len -= (hlen - sizeof(struct ip)); /* construct new IPv4 header. see RFC 2401 5.1.2.1 */ /* ECN consideration. */ ip_ecn_ingress(ip4_ipsec_ecn, &ip->ip_tos, &oip->ip_tos); #ifdef _IP_VHL ip->ip_vhl = IP_MAKE_VHL(IPVERSION, sizeof(struct ip) >> 2); #else ip->ip_hl = sizeof(struct ip) >> 2; #endif ip->ip_off &= htons(~IP_OFFMASK); ip->ip_off &= htons(~IP_MF); switch (ip4_ipsec_dfbit) { case 0: /*clear DF bit*/ ip->ip_off &= htons(~IP_DF); break; case 1: /*set DF bit*/ ip->ip_off |= htons(IP_DF); break; default: /*copy DF bit*/ break; } ip->ip_p = IPPROTO_IPIP; if (plen + sizeof(struct ip) < IP_MAXPACKET) ip->ip_len = htons(plen + sizeof(struct ip)); else { printf("IPv4 ipsec: size exceeds limit: " "leave ip_len as is (invalid packet)\n"); } ip->ip_id = htons(ip_id++); bcopy(&((struct sockaddr_in *)&sav->sah->saidx.src)->sin_addr, &ip->ip_src, sizeof(ip->ip_src)); bcopy(&((struct sockaddr_in *)&sav->sah->saidx.dst)->sin_addr, &ip->ip_dst, sizeof(ip->ip_dst)); /* XXX Should ip_src be updated later ? */ return 0; } #endif /*INET*/ #ifdef INET6 static int ipsec6_encapsulate(m, sav) struct mbuf *m; struct secasvar *sav; { struct ip6_hdr *oip6; struct ip6_hdr *ip6; size_t plen; /* can't tunnel between different AFs */ if (sav->sah->saidx.src.ss_family != sav->sah->saidx.dst.ss_family || sav->sah->saidx.src.ss_family != AF_INET6) { m_freem(m); return EINVAL; } plen = m->m_pkthdr.len; /* * grow the mbuf to accomodate the new IPv6 header. */ if (m->m_len != sizeof(struct ip6_hdr)) panic("ipsec6_encapsulate: assumption failed (first mbuf length)"); if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { struct mbuf *n; MGET(n, M_DONTWAIT, MT_DATA); if (!n) { m_freem(m); return ENOBUFS; } n->m_len = sizeof(struct ip6_hdr); n->m_next = m->m_next; m->m_next = n; m->m_pkthdr.len += sizeof(struct ip6_hdr); oip6 = mtod(n, struct ip6_hdr *); } else { m->m_next->m_len += sizeof(struct ip6_hdr); m->m_next->m_data -= sizeof(struct ip6_hdr); m->m_pkthdr.len += sizeof(struct ip6_hdr); oip6 = mtod(m->m_next, struct ip6_hdr *); } ip6 = mtod(m, struct ip6_hdr *); ovbcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); /* Fake link-local scope-class addresses */ if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) oip6->ip6_src.s6_addr16[1] = 0; if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) oip6->ip6_dst.s6_addr16[1] = 0; /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ /* ECN consideration. */ ip6_ecn_ingress(ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) ip6->ip6_plen = htons(plen); else { /* ip6->ip6_plen will be updated in ip6_output() */ } ip6->ip6_nxt = IPPROTO_IPV6; bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.src)->sin6_addr, &ip6->ip6_src, sizeof(ip6->ip6_src)); bcopy(&((struct sockaddr_in6 *)&sav->sah->saidx.dst)->sin6_addr, &ip6->ip6_dst, sizeof(ip6->ip6_dst)); /* XXX Should ip6_src be updated later ? */ return 0; } #endif /*INET6*/ /* * Check the variable replay window. * ipsec_chkreplay() performs replay check before ICV verification. * ipsec_updatereplay() updates replay bitmap. This must be called after * ICV verification (it also performs replay check, which is usually done * beforehand). * 0 (zero) is returned if packet disallowed, 1 if packet permitted. * * based on RFC 2401. */ int ipsec_chkreplay(seq, sav) u_int32_t seq; struct secasvar *sav; { const struct secreplay *replay; u_int32_t diff; int fr; u_int32_t wsizeb; /* constant: bits of window size */ int frlast; /* constant: last frame */ /* sanity check */ if (sav == NULL) printf("ipsec_chkreplay: NULL pointer was passed.\n"); replay = sav->replay; if (replay->wsize == 0) return 1; /* no need to check replay. */ /* constant */ frlast = replay->wsize - 1; wsizeb = replay->wsize << 3; /* sequence number of 0 is invalid */ if (seq == 0) return 0; /* first time is always okay */ if (replay->count == 0) return 1; if (seq > replay->lastseq) { /* larger sequences are okay */ return 1; } else { /* seq is equal or less than lastseq. */ diff = replay->lastseq - seq; /* over range to check, i.e. too old or wrapped */ if (diff >= wsizeb) return 0; fr = frlast - diff / 8; /* this packet already seen ? */ if ((replay->bitmap)[fr] & (1 << (diff % 8))) return 0; /* out of order but good */ return 1; } } int ipsec_updatereplay(seq, sav) u_int32_t seq; struct secasvar *sav; { struct secreplay *replay; u_int32_t diff; int fr; u_int32_t wsizeb; /* constant: bits of window size */ int frlast; /* constant: last frame */ /* sanity check */ if (sav == NULL) printf("ipsec_chkreplay: NULL pointer was passed.\n"); replay = sav->replay; if (replay->wsize == 0) goto ok; /* no need to check replay. */ /* constant */ frlast = replay->wsize - 1; wsizeb = replay->wsize << 3; /* sequence number of 0 is invalid */ if (seq == 0) return 0; /* first time */ if (replay->count == 0) { replay->lastseq = seq; bzero(replay->bitmap, replay->wsize); (replay->bitmap)[frlast] = 1; goto ok; } if (seq > replay->lastseq) { /* seq is larger than lastseq. */ diff = seq - replay->lastseq; /* new larger sequence number */ if (diff < wsizeb) { /* In window */ /* set bit for this packet */ vshiftl(replay->bitmap, diff, replay->wsize); (replay->bitmap)[frlast] |= 1; } else { /* this packet has a "way larger" */ bzero(replay->bitmap, replay->wsize); (replay->bitmap)[frlast] = 1; } replay->lastseq = seq; /* larger is good */ } else { /* seq is equal or less than lastseq. */ diff = replay->lastseq - seq; /* over range to check, i.e. too old or wrapped */ if (diff >= wsizeb) return 0; fr = frlast - diff / 8; /* this packet already seen ? */ if ((replay->bitmap)[fr] & (1 << (diff % 8))) return 0; /* mark as seen */ (replay->bitmap)[fr] |= (1 << (diff % 8)); /* out of order but good */ } ok: if (replay->count == ~0 && (sav->flags & SADB_X_EXT_CYCSEQ) == 0) { return 1; /* don't increment, no more packets accepted */ } replay->count++; return 1; } /* * shift variable length bunffer to left. * IN: bitmap: pointer to the buffer * nbit: the number of to shift. * wsize: buffer size (bytes). */ static void vshiftl(bitmap, nbit, wsize) unsigned char *bitmap; int nbit, wsize; { int s, j, i; unsigned char over; for (j = 0; j < nbit; j += 8) { s = (nbit - j < 8) ? (nbit - j): 8; bitmap[0] <<= s; for (i = 1; i < wsize; i++) { over = (bitmap[i] >> (8 - s)); bitmap[i] <<= s; bitmap[i-1] |= over; } } return; } const char * ipsec4_logpacketstr(ip, spi) struct ip *ip; u_int32_t spi; { static char buf[256]; char *p; u_int8_t *s, *d; s = (u_int8_t *)(&ip->ip_src); d = (u_int8_t *)(&ip->ip_dst); snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi)); for (p = buf; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), "src=%d.%d.%d.%d", s[0], s[1], s[2], s[3]); for (/*nothing*/; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), " dst=%d.%d.%d.%d", d[0], d[1], d[2], d[3]); for (/*nothing*/; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), ")"); return buf; } #ifdef INET6 const char * ipsec6_logpacketstr(ip6, spi) struct ip6_hdr *ip6; u_int32_t spi; { static char buf[256]; char *p; snprintf(buf, sizeof(buf), "packet(SPI=%u ", (u_int32_t)ntohl(spi)); for (p = buf; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), "src=%s", ip6_sprintf(&ip6->ip6_src)); for (/*nothing*/; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), " dst=%s", ip6_sprintf(&ip6->ip6_dst)); for (/*nothing*/; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), ")"); return buf; } #endif /*INET6*/ const char * ipsec_logsastr(sav) struct secasvar *sav; { static char buf[256]; char *p; struct secasindex *saidx = &sav->sah->saidx; /* validity check */ if (sav->sah->saidx.src.ss_family != sav->sah->saidx.dst.ss_family) panic("ipsec_logsastr: family mismatched.\n"); snprintf(buf, sizeof(buf), "SA(SPI=%u ", (u_int32_t)ntohl(sav->spi)); for (p = buf; p && *p; p++) ; if (saidx->src.ss_family == AF_INET) { u_int8_t *s, *d; s = (u_int8_t *)&((struct sockaddr_in *)&saidx->src)->sin_addr; d = (u_int8_t *)&((struct sockaddr_in *)&saidx->dst)->sin_addr; snprintf(p, sizeof(buf) - (p - buf), "src=%d.%d.%d.%d dst=%d.%d.%d.%d", s[0], s[1], s[2], s[3], d[0], d[1], d[2], d[3]); } #ifdef INET6 else if (saidx->src.ss_family == AF_INET6) { snprintf(p, sizeof(buf) - (p - buf), "src=%s", ip6_sprintf(&((struct sockaddr_in6 *)&saidx->src)->sin6_addr)); for (/*nothing*/; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), " dst=%s", ip6_sprintf(&((struct sockaddr_in6 *)&saidx->dst)->sin6_addr)); } #endif for (/*nothing*/; p && *p; p++) ; snprintf(p, sizeof(buf) - (p - buf), ")"); return buf; } void ipsec_dumpmbuf(m) struct mbuf *m; { int totlen; int i; u_char *p; totlen = 0; printf("---\n"); while (m) { p = mtod(m, u_char *); for (i = 0; i < m->m_len; i++) { printf("%02x ", p[i]); totlen++; if (totlen % 16 == 0) printf("\n"); } m = m->m_next; } if (totlen % 16 != 0) printf("\n"); printf("---\n"); } /* * IPsec output logic for IPv4. */ int ipsec4_output(state, sp, flags) struct ipsec_output_state *state; struct secpolicy *sp; int flags; { struct ip *ip = NULL; struct ipsecrequest *isr = NULL; int s; int error; #ifdef IPSEC_SRCSEL struct in_ifaddr *ia; #endif struct sockaddr_in *dst4; if (!state) panic("state == NULL in ipsec4_output"); if (!state->m) panic("state->m == NULL in ipsec4_output"); if (!state->ro) panic("state->ro == NULL in ipsec4_output"); if (!state->dst) panic("state->dst == NULL in ipsec4_output"); ip = mtod(state->m, struct ip *); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec4_output: applyed SP\n"); kdebug_secpolicy(sp)); for (isr = sp->req; isr != NULL; isr = isr->next) { if ((error = key_checkrequest(isr)) != 0) { /* * IPsec processing is required, but no SA found. * I assume that key_acquire() had been called * to get/establish the SA. Here I discard * this packet because it is responsibility for * upper layer to retransmit the packet. */ ipsecstat.out_nosa++; goto bad; } /* validity check */ if (isr->sav == NULL) { switch (ipsec_get_reqlevel(isr)) { case IPSEC_LEVEL_USE: continue; case IPSEC_LEVEL_REQUIRE: /* must be not reached here. */ panic("ipsec4_output: no SA found, but required."); } } if (isr->sav->state != SADB_SASTATE_MATURE && isr->sav->state != SADB_SASTATE_DYING) { /* If there is no valid SA, we give up to process. */ ipsecstat.out_nosa++; error = EINVAL; goto bad; } /* * There may be the case that SA status will be changed when * we are refering to one. So calling splsoftnet(). */ s = splnet(); if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { /* * build IPsec tunnel. */ /* XXX should be processed with other familiy */ if (isr->sav->sah->saidx.src.ss_family != AF_INET) { printf("ipsec4_output: family mismatched " "between inner and outer spi=%u\n", (u_int32_t)ntohl(isr->sav->spi)); splx(s); error = EAFNOSUPPORT; goto bad; } ip = mtod(state->m, struct ip *); state->m = ipsec4_splithdr(state->m); if (!state->m) { splx(s); error = ENOMEM; goto bad; } error = ipsec4_encapsulate(state->m, isr->sav); splx(s); if (error) { state->m = NULL; goto bad; } ip = mtod(state->m, struct ip *); state->ro = &isr->sav->sah->sa_route; state->dst = (struct sockaddr *)&state->ro->ro_dst; dst4 = (struct sockaddr_in *)state->dst; if (state->ro->ro_rt && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 || dst4->sin_addr.s_addr != ip->ip_dst.s_addr)) { RTFREE(state->ro->ro_rt); bzero((caddr_t)state->ro, sizeof (*state->ro)); } if (state->ro->ro_rt == 0) { dst4->sin_family = AF_INET; dst4->sin_len = sizeof(*dst4); dst4->sin_addr = ip->ip_dst; rtalloc(state->ro); } if (state->ro->ro_rt == 0) { ipstat.ips_noroute++; error = EHOSTUNREACH; goto bad; } #ifdef IPSEC_SRCSEL /* * Which address in SA or in routing table should I * select from ? But I had set from SA at * ipsec4_encapsulate(). */ ia = (struct in_ifaddr *)(state->ro->ro_rt->rt_ifa); if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) { state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; dst4 = (struct sockaddr_in *)state->dst; } ip->ip_src = IA_SIN(ia)->sin_addr; #endif } else splx(s); state->m = ipsec4_splithdr(state->m); if (!state->m) { error = ENOMEM; goto bad; } switch (isr->saidx.proto) { case IPPROTO_ESP: #ifdef IPSEC_ESP if ((error = esp4_output(state->m, isr)) != 0) { state->m = NULL; goto bad; } break; #else m_freem(state->m); state->m = NULL; error = EINVAL; goto bad; #endif case IPPROTO_AH: if ((error = ah4_output(state->m, isr)) != 0) { state->m = NULL; goto bad; } break; default: printf("ipsec4_output: unknown ipsec protocol %d\n", isr->saidx.proto); m_freem(state->m); state->m = NULL; error = EINVAL; goto bad; } if (state->m == 0) { error = ENOMEM; goto bad; } ip = mtod(state->m, struct ip *); } return 0; bad: m_freem(state->m); state->m = NULL; return error; } #ifdef INET6 /* * IPsec output logic for IPv6, transport mode. */ int ipsec6_output_trans(state, nexthdrp, mprev, sp, flags, tun) struct ipsec_output_state *state; u_char *nexthdrp; struct mbuf *mprev; struct secpolicy *sp; int flags; int *tun; { struct ip6_hdr *ip6; struct ipsecrequest *isr = NULL; int error = 0; int plen; if (!state) panic("state == NULL in ipsec6_output"); if (!state->m) panic("state->m == NULL in ipsec6_output"); if (!nexthdrp) panic("nexthdrp == NULL in ipsec6_output"); if (!mprev) panic("mprev == NULL in ipsec6_output"); if (!sp) panic("sp == NULL in ipsec6_output"); if (!tun) panic("tun == NULL in ipsec6_output"); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec6_output_trans: applyed SP\n"); kdebug_secpolicy(sp)); *tun = 0; for (isr = sp->req; isr; isr = isr->next) { if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { /* the rest will be handled by ipsec6_output_tunnel() */ break; } if (key_checkrequest(isr) == ENOENT) { /* * IPsec processing is required, but no SA found. * I assume that key_acquire() had been called * to get/establish the SA. Here I discard * this packet because it is responsibility for * upper layer to retransmit the packet. */ ipsec6stat.out_nosa++; error = ENOENT; goto bad; } /* validity check */ if (isr->sav == NULL) { switch (ipsec_get_reqlevel(isr)) { case IPSEC_LEVEL_USE: continue; case IPSEC_LEVEL_REQUIRE: /* must be not reached here. */ panic("ipsec6_output_trans: no SA found, but required."); } } if (isr->sav->state != SADB_SASTATE_MATURE && isr->sav->state != SADB_SASTATE_DYING) { /* If there is no valid SA, we give up to process. */ ipsec6stat.out_nosa++; error = EINVAL; goto bad; } switch (isr->saidx.proto) { case IPPROTO_ESP: #ifdef IPSEC_ESP error = esp6_output(state->m, nexthdrp, mprev->m_next, isr); #else m_freem(state->m); error = EINVAL; #endif break; case IPPROTO_AH: error = ah6_output(state->m, nexthdrp, mprev->m_next, isr); break; default: printf("ipsec6_output_trans: unknown ipsec protocol %d\n", isr->saidx.proto); m_freem(state->m); error = EINVAL; break; } if (error) { state->m = NULL; goto bad; } plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr); if (plen > IPV6_MAXPACKET) { printf("ipsec6_output: IPsec with IPv6 jumbogram is not supported\n"); ipsec6stat.out_inval++; error = EINVAL; /*XXX*/ goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); ip6->ip6_plen = htons(plen); } /* if we have more to go, we need a tunnel mode processing */ if (isr != NULL) *tun = 1; return 0; bad: m_freem(state->m); state->m = NULL; return error; } /* * IPsec output logic for IPv6, tunnel mode. */ int ipsec6_output_tunnel(state, sp, flags) struct ipsec_output_state *state; struct secpolicy *sp; int flags; { struct ip6_hdr *ip6; struct ipsecrequest *isr = NULL; int error = 0; int plen; #ifdef IPSEC_SRCSEL struct in6_addr *ia6; #endif struct sockaddr_in6* dst6; int s; if (!state) panic("state == NULL in ipsec6_output"); if (!state->m) panic("state->m == NULL in ipsec6_output"); if (!sp) panic("sp == NULL in ipsec6_output"); KEYDEBUG(KEYDEBUG_IPSEC_DATA, printf("ipsec6_output_tunnel: applyed SP\n"); kdebug_secpolicy(sp)); /* * transport mode ipsec (before the 1st tunnel mode) is already * processed by ipsec6_output_trans(). */ for (isr = sp->req; isr; isr = isr->next) { if (isr->saidx.mode == IPSEC_MODE_TUNNEL) break; } for (/*already initialized*/; isr; isr = isr->next) { if (key_checkrequest(isr) == ENOENT) { /* * IPsec processing is required, but no SA found. * I assume that key_acquire() had been called * to get/establish the SA. Here I discard * this packet because it is responsibility for * upper layer to retransmit the packet. */ ipsec6stat.out_nosa++; error = ENOENT; goto bad; } /* validity check */ if (isr->sav == NULL) { switch (ipsec_get_reqlevel(isr)) { case IPSEC_LEVEL_USE: continue; case IPSEC_LEVEL_REQUIRE: /* must be not reached here. */ panic("ipsec6_output_tunnel: no SA found, but required."); } } if (isr->sav->state != SADB_SASTATE_MATURE && isr->sav->state != SADB_SASTATE_DYING) { /* If there is no valid SA, we give up to process. */ ipsec6stat.out_nosa++; error = EINVAL; goto bad; } /* * There may be the case that SA status will be changed when * we are refering to one. So calling splsoftnet(). */ s = splnet(); if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { /* * build IPsec tunnel. */ /* XXX should be processed with other familiy */ if (isr->sav->sah->saidx.src.ss_family != AF_INET6) { printf("ipsec4_output: family mismatched " "between inner and outer, spi=%u\n", (u_int32_t)ntohl(isr->sav->spi)); printf("ipsec6_output_tunnel: family mismatched " "between inner and outer, spi=%u\n", (u_int32_t)ntohl(isr->sav->spi)); splx(s); error = EAFNOSUPPORT; goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); state->m = ipsec6_splithdr(state->m); if (!state->m) { splx(s); error = ENOMEM; goto bad; } error = ipsec6_encapsulate(state->m, isr->sav); splx(s); if (error) { state->m = 0; goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); state->ro = &isr->sav->sah->sa_route; state->dst = (struct sockaddr *)&state->ro->ro_dst; dst6 = (struct sockaddr_in6 *)state->dst; if (state->ro->ro_rt && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { RTFREE(state->ro->ro_rt); bzero((caddr_t)state->ro, sizeof (*state->ro)); } if (state->ro->ro_rt == 0) { bzero(dst6, sizeof(*dst6)); dst6->sin6_family = AF_INET6; dst6->sin6_len = sizeof(*dst6); dst6->sin6_addr = ip6->ip6_dst; rtalloc(state->ro); } if (state->ro->ro_rt == 0) { ip6stat.ip6s_noroute++; error = EHOSTUNREACH; goto bad; } #ifdef IPSEC_SRCSEL /* * Which address in SA or in routing table should I * select from ? But I had set from SA at * ipsec6_encapsulate(). */ ia6 = in6_selectsrc(dst6, NULL, NULL, (struct route_in6 *)state->ro, NULL, &error); if (ia6 == NULL) goto bad; ip6->ip6_src = *ia6; #endif } else splx(s); state->m = ipsec6_splithdr(state->m); if (!state->m) { error = ENOMEM; goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); switch (isr->saidx.proto) { case IPPROTO_ESP: #ifdef IPSEC_ESP error = esp6_output(state->m, &ip6->ip6_nxt, state->m->m_next, isr); #else m_freem(state->m); error = EINVAL; #endif break; case IPPROTO_AH: error = ah6_output(state->m, &ip6->ip6_nxt, state->m->m_next, isr); break; default: printf("ipsec6_output_tunnel: unknown ipsec protocol %d\n", isr->saidx.proto); m_freem(state->m); error = EINVAL; break; } if (error) { state->m = NULL; goto bad; } plen = state->m->m_pkthdr.len - sizeof(struct ip6_hdr); if (plen > IPV6_MAXPACKET) { printf("ipsec6_output_tunnel: IPsec with IPv6 jumbogram is not supported\n"); ipsec6stat.out_inval++; error = EINVAL; /*XXX*/ goto bad; } ip6 = mtod(state->m, struct ip6_hdr *); ip6->ip6_plen = htons(plen); } return 0; bad: m_freem(state->m); state->m = NULL; return error; } #endif /*INET6*/ /* * Chop IP header and option off from the payload. */ static struct mbuf * ipsec4_splithdr(m) struct mbuf *m; { struct mbuf *mh; struct ip *ip; int hlen; if (m->m_len < sizeof(struct ip)) panic("ipsec4_splithdr: first mbuf too short"); ip = mtod(m, struct ip *); #ifdef _IP_VHL hlen = _IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif if (m->m_len > hlen) { MGETHDR(mh, M_DONTWAIT, MT_HEADER); if (!mh) { m_freem(m); return NULL; } M_COPY_PKTHDR(mh, m); MH_ALIGN(mh, hlen); m->m_flags &= ~M_PKTHDR; m->m_len -= hlen; m->m_data += hlen; mh->m_next = m; m = mh; m->m_len = hlen; bcopy((caddr_t)ip, mtod(m, caddr_t), hlen); } else if (m->m_len < hlen) { m = m_pullup(m, hlen); if (!m) return NULL; } return m; } #ifdef INET6 static struct mbuf * ipsec6_splithdr(m) struct mbuf *m; { struct mbuf *mh; struct ip6_hdr *ip6; int hlen; if (m->m_len < sizeof(struct ip6_hdr)) panic("ipsec6_splithdr: first mbuf too short"); ip6 = mtod(m, struct ip6_hdr *); hlen = sizeof(struct ip6_hdr); if (m->m_len > hlen) { MGETHDR(mh, M_DONTWAIT, MT_HEADER); if (!mh) { m_freem(m); return NULL; } M_COPY_PKTHDR(mh, m); MH_ALIGN(mh, hlen); m->m_flags &= ~M_PKTHDR; m->m_len -= hlen; m->m_data += hlen; mh->m_next = m; m = mh; m->m_len = hlen; bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); } else if (m->m_len < hlen) { m = m_pullup(m, hlen); if (!m) return NULL; } return m; } #endif /* validate inbound IPsec tunnel packet. */ int ipsec4_tunnel_validate(ip, nxt0, sav) struct ip *ip; u_int nxt0; struct secasvar *sav; { u_int8_t nxt = nxt0 & 0xff; struct sockaddr_in *sin; int hlen; if (nxt != IPPROTO_IPV4) return 0; #ifdef _IP_VHL hlen = _IP_VHL_HL(ip->ip_vhl) << 2; #else hlen = ip->ip_hl << 2; #endif if (hlen != sizeof(struct ip)) return 0; switch (sav->sah->saidx.dst.ss_family) { case AF_INET: sin = (struct sockaddr_in *)&sav->sah->saidx.dst; if (bcmp(&ip->ip_dst, &sin->sin_addr, sizeof(ip->ip_dst)) != 0) return 0; break; #ifdef INET6 case AF_INET6: /* should be supported, but at this moment we don't. */ /*FALLTHROUGH*/ #endif default: return 0; } return 1; } #ifdef INET6 /* validate inbound IPsec tunnel packet. */ int ipsec6_tunnel_validate(ip6, nxt0, sav) struct ip6_hdr *ip6; u_int nxt0; struct secasvar *sav; { u_int8_t nxt = nxt0 & 0xff; struct sockaddr_in6 *sin6; if (nxt != IPPROTO_IPV6) return 0; switch (sav->sah->saidx.dst.ss_family) { case AF_INET6: sin6 = ((struct sockaddr_in6 *)&sav->sah->saidx.dst); if (!IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &sin6->sin6_addr)) return 0; break; case AF_INET: /* should be supported, but at this moment we don't. */ /*FALLTHROUGH*/ default: return 0; } return 1; } #endif /* * Make a mbuf chain for encryption. * If the original mbuf chain contains a mbuf with a cluster, * allocate a new cluster and copy the data to the new cluster. * XXX: this hack is inefficient, but is necessary to handle cases * of TCP retransmission... */ struct mbuf * ipsec_copypkt(m) struct mbuf *m; { struct mbuf *n, **mpp, *mnew; for (n = m, mpp = &m; n; n = n->m_next) { if (n->m_flags & M_EXT) { /* * Make a copy only if there are more than one references * to the cluster. * XXX: is this approach effective? */ if ( n->m_ext.ext_free || mclrefcnt[mtocl(n->m_ext.ext_buf)] > 1 ) { int remain, copied; struct mbuf *mm; if (n->m_flags & M_PKTHDR) { MGETHDR(mnew, M_DONTWAIT, MT_HEADER); if (mnew == NULL) goto fail; mnew->m_pkthdr = n->m_pkthdr; mnew->m_flags = n->m_flags & M_COPYFLAGS; } else { MGET(mnew, M_DONTWAIT, MT_DATA); if (mnew == NULL) goto fail; } mnew->m_len = 0; mm = mnew; /* * Copy data. If we don't have enough space to * store the whole data, allocate a cluster * or additional mbufs. * XXX: we don't use m_copyback(), since the * function does not use clusters and thus is * inefficient. */ remain = n->m_len; copied = 0; while(1) { int len; struct mbuf *mn; if (remain <= (mm->m_flags & M_PKTHDR ? MHLEN : MLEN)) len = remain; else { /* allocate a cluster */ MCLGET(mm, M_DONTWAIT); if (!(mm->m_flags & M_EXT)) { m_free(mm); goto fail; } len = remain < MCLBYTES ? remain : MCLBYTES; } bcopy(n->m_data + copied, mm->m_data, len); copied += len; remain -= len; mm->m_len = len; if (remain <= 0) /* completed? */ break; /* need another mbuf */ MGETHDR(mn, M_DONTWAIT, MT_HEADER); if (mn == NULL) goto fail; mm->m_next = mn; mm = mn; } /* adjust chain */ mm->m_next = m_free(n); n = mm; *mpp = mnew; mpp = &n->m_next; continue; } } *mpp = n; mpp = &n->m_next; } return(m); fail: m_freem(m); return(NULL); }