/* $NetBSD: ipsec_netbsd.c,v 1.25 2007/03/25 22:06:33 degroote Exp $ */ /* $KAME: esp_input.c,v 1.60 2001/09/04 08:43:19 itojun Exp $ */ /* $KAME: ah_input.c,v 1.64 2001/09/04 08:43:19 itojun Exp $ */ /* * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the project nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include __KERNEL_RCSID(0, "$NetBSD: ipsec_netbsd.c,v 1.25 2007/03/25 22:06:33 degroote Exp $"); #include "opt_inet.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 #include #include #include #include #include #include #include #include #ifdef INET6 #include #include #include #endif #include #include /* assumes that ip header and ah header are contiguous on mbuf */ void* ah4_ctlinput(cmd, sa, v) int cmd; const struct sockaddr *sa; void *v; { struct ip *ip = v; struct ah *ah; struct icmp *icp; struct secasvar *sav; if (sa->sa_family != AF_INET || sa->sa_len != sizeof(struct sockaddr_in)) return NULL; if ((unsigned)cmd >= PRC_NCMDS) return NULL; if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) { /* * Check to see if we have a valid SA corresponding to * the address in the ICMP message payload. */ ah = (struct ah *)((char *)ip + (ip->ip_hl << 2)); sav = KEY_ALLOCSA((const union sockaddr_union *)sa, IPPROTO_AH, ah->ah_spi); if (sav) { if (sav->state == SADB_SASTATE_MATURE || sav->state == SADB_SASTATE_DYING) { /* * Now that we've validated that we are actually * communicating with the host indicated in the * ICMP message, locate the ICMP header, * recalculate the new MTU, and create the * corresponding routing entry. */ icp = (struct icmp *)((char *)ip - offsetof(struct icmp, icmp_ip)); icmp_mtudisc(icp, ip->ip_dst); } KEY_FREESAV(&sav); } } return NULL; } /* assumes that ip header and esp header are contiguous on mbuf */ void* esp4_ctlinput(cmd, sa, v) int cmd; const struct sockaddr *sa; void *v; { struct ip *ip = v; struct esp *esp; struct icmp *icp; struct secasvar *sav; if (sa->sa_family != AF_INET || sa->sa_len != sizeof(struct sockaddr_in)) return NULL; if ((unsigned)cmd >= PRC_NCMDS) return NULL; if (cmd == PRC_MSGSIZE && ip_mtudisc && ip && ip->ip_v == 4) { /* * Check to see if we have a valid SA corresponding to * the address in the ICMP message payload. */ esp = (struct esp *)((char *)ip + (ip->ip_hl << 2)); sav = KEY_ALLOCSA((const union sockaddr_union *)sa, IPPROTO_ESP, esp->esp_spi); if (sav) { if (sav->state == SADB_SASTATE_MATURE || sav->state == SADB_SASTATE_DYING) { /* * Now that we've validated that we are actually * communicating with the host indicated in the * ICMP message, locate the ICMP header, * recalculate the new MTU, and create the * corresponding routing entry. */ icp = (struct icmp *)((char *)ip - offsetof(struct icmp, icmp_ip)); icmp_mtudisc(icp, ip->ip_dst); } KEY_FREESAV(&sav); } } return NULL; } #ifdef INET6 void ah6_ctlinput(cmd, sa, d) int cmd; const struct sockaddr *sa; void *d; { const struct newah *ahp; struct newah ah; struct secasvar *sav; struct ip6_hdr *ip6; struct mbuf *m; struct ip6ctlparam *ip6cp = NULL; int off; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) return; if ((unsigned)cmd >= PRC_NCMDS) return; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; m = ip6cp->ip6c_m; ip6 = ip6cp->ip6c_ip6; off = ip6cp->ip6c_off; } else { m = NULL; ip6 = NULL; off = 0; } if (ip6) { /* * XXX: We assume that when ip6 is non NULL, * M and OFF are valid. */ /* check if we can safely examine src and dst ports */ if (m->m_pkthdr.len < off + sizeof(ah)) return; if (m->m_len < off + sizeof(ah)) { /* * this should be rare case, * so we compromise on this copy... */ m_copydata(m, off, sizeof(ah), &ah); ahp = &ah; } else ahp = (struct newah *)(mtod(m, char *) + off); if (cmd == PRC_MSGSIZE) { int valid = 0; /* * Check to see if we have a valid SA corresponding * to the address in the ICMP message payload. */ sav = KEY_ALLOCSA((const union sockaddr_union*)sa, IPPROTO_AH, ahp->ah_spi); if (sav) { if (sav->state == SADB_SASTATE_MATURE || sav->state == SADB_SASTATE_DYING) valid++; KEY_FREESAV(&sav); } /* XXX Further validation? */ /* * Depending on the value of "valid" and routing * table size (mtudisc_{hi,lo}wat), we will: * - recalcurate the new MTU and create the * corresponding routing entry, or * - ignore the MTU change notification. */ icmp6_mtudisc_update((struct ip6ctlparam *)d,valid); } /* we normally notify single pcb here */ } else { /* we normally notify any pcb here */ } } void esp6_ctlinput(cmd, sa, d) int cmd; const struct sockaddr *sa; void *d; { const struct newesp *espp; struct newesp esp; struct ip6ctlparam *ip6cp = NULL, ip6cp1; struct secasvar *sav; struct ip6_hdr *ip6; struct mbuf *m; int off; if (sa->sa_family != AF_INET6 || sa->sa_len != sizeof(struct sockaddr_in6)) return; if ((unsigned)cmd >= PRC_NCMDS) return; /* if the parameter is from icmp6, decode it. */ if (d != NULL) { ip6cp = (struct ip6ctlparam *)d; m = ip6cp->ip6c_m; ip6 = ip6cp->ip6c_ip6; off = ip6cp->ip6c_off; } else { m = NULL; ip6 = NULL; off = 0; } if (ip6) { /* * Notify the error to all possible sockets via pfctlinput2. * Since the upper layer information (such as protocol type, * source and destination ports) is embedded in the encrypted * data and might have been cut, we can't directly call * an upper layer ctlinput function. However, the pcbnotify * function will consider source and destination addresses * as well as the flow info value, and may be able to find * some PCB that should be notified. * Although pfctlinput2 will call esp6_ctlinput(), there is * no possibility of an infinite loop of function calls, * because we don't pass the inner IPv6 header. */ memset(&ip6cp1, 0, sizeof(ip6cp1)); ip6cp1.ip6c_src = ip6cp->ip6c_src; pfctlinput2(cmd, sa, &ip6cp1); /* * Then go to special cases that need ESP header information. * XXX: We assume that when ip6 is non NULL, * M and OFF are valid. */ /* check if we can safely examine src and dst ports */ if (m->m_pkthdr.len < off + sizeof(esp)) return; if (m->m_len < off + sizeof(esp)) { /* * this should be rare case, * so we compromise on this copy... */ m_copydata(m, off, sizeof(esp), &esp); espp = &esp; } else espp = (struct newesp*)(mtod(m, char *) + off); if (cmd == PRC_MSGSIZE) { int valid = 0; /* * Check to see if we have a valid SA corresponding to * the address in the ICMP message payload. */ sav = KEY_ALLOCSA((const union sockaddr_union*)sa, IPPROTO_ESP, espp->esp_spi); if (sav) { if (sav->state == SADB_SASTATE_MATURE || sav->state == SADB_SASTATE_DYING) valid++; KEY_FREESAV(&sav); } /* XXX Further validation? */ /* * Depending on the value of "valid" and routing table * size (mtudisc_{hi,lo}wat), we will: * - recalcurate the new MTU and create the * corresponding routing entry, or * - ignore the MTU change notification. */ icmp6_mtudisc_update((struct ip6ctlparam *)d, valid); } } else { /* we normally notify any pcb here */ } } #endif /* INET6 */ static int sysctl_fast_ipsec(SYSCTLFN_ARGS) { int error, t; struct sysctlnode node; node = *rnode; t = *(int*)rnode->sysctl_data; node.sysctl_data = &t; error = sysctl_lookup(SYSCTLFN_CALL(&node)); if (error || newp == NULL) return (error); switch (rnode->sysctl_num) { case IPSECCTL_DEF_ESP_TRANSLEV: case IPSECCTL_DEF_ESP_NETLEV: case IPSECCTL_DEF_AH_TRANSLEV: case IPSECCTL_DEF_AH_NETLEV: if (t != IPSEC_LEVEL_USE && t != IPSEC_LEVEL_REQUIRE) return (EINVAL); ipsec_invalpcbcacheall(); break; case IPSECCTL_DEF_POLICY: if (t != IPSEC_POLICY_DISCARD && t != IPSEC_POLICY_NONE) return (EINVAL); ipsec_invalpcbcacheall(); break; default: return (EINVAL); } *(int*)rnode->sysctl_data = t; return (0); } #ifdef IPSEC_DEBUG static int sysctl_fast_ipsec_test(SYSCTLFN_ARGS) { int t, error; struct sysctlnode node; node = *rnode; t = *(int*)rnode->sysctl_data; node.sysctl_data = &t; error = sysctl_lookup(SYSCTLFN_CALL(&node)); if (error || newp == NULL) return (error); if (t < 0 || t > 1) return EINVAL; if (rnode->sysctl_data == &ipsec_replay) printf("fast_ipsec: Anti-Replay service %s\n", (t == 1) ? "deactivated" : "activated"); else if (rnode->sysctl_data == &ipsec_integrity) printf("fast_ipsec: HMAC corruption %s\n", (t == 0) ? "deactivated" : "activated"); *(int*)rnode->sysctl_data = t; return 0; } #endif /* XXX will need a different oid at parent */ SYSCTL_SETUP(sysctl_net_inet_fast_ipsec_setup, "sysctl net.inet.ipsec subtree setup") { const struct sysctlnode *_ipsec; int ipproto_ipsec; sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "net", NULL, NULL, 0, NULL, 0, CTL_NET, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "inet", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET, CTL_EOL); /* * in numerical order: * * net.inet.ipip: CTL_NET.PF_INET.IPPROTO_IPIP * net.inet.esp: CTL_NET.PF_INET.IPPROTO_ESP * net.inet.ah: CTL_NET.PF_INET.IPPROTO_AH * net.inet.ipcomp: CTL_NET.PF_INET.IPPROTO_IPCOMP * net.inet.ipsec: CTL_NET.PF_INET.CTL_CREATE * * this creates separate trees by name, but maintains that the * ipsec name leads to all the old leaves. */ /* create net.inet.ipip */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ipip", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET, IPPROTO_IPIP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READONLY, CTLTYPE_STRUCT, "ipip_stats", NULL, NULL, 0, &ipipstat, sizeof(ipipstat), CTL_NET, PF_INET, IPPROTO_IPIP, CTL_CREATE, CTL_EOL); /* create net.inet.esp subtree under IPPROTO_ESP */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "esp", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET, IPPROTO_ESP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "trans_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_esp_trans_deflev, 0, CTL_NET, PF_INET, IPPROTO_ESP, IPSECCTL_DEF_ESP_TRANSLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "net_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_esp_net_deflev, 0, CTL_NET, PF_INET, IPPROTO_ESP, IPSECCTL_DEF_ESP_NETLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READONLY, CTLTYPE_STRUCT, "esp_stats", NULL, NULL, 0, &espstat, sizeof(espstat), CTL_NET, PF_INET, IPPROTO_ESP, CTL_CREATE, CTL_EOL); /* create net.inet.ah subtree under IPPROTO_AH */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ah", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET, IPPROTO_AH, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "cleartos", NULL, NULL, 0, &ip4_ah_cleartos, 0, CTL_NET, PF_INET, IPPROTO_AH, IPSECCTL_AH_CLEARTOS, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "offsetmask", NULL, NULL, 0, &ip4_ah_offsetmask, 0, CTL_NET, PF_INET, IPPROTO_AH, IPSECCTL_AH_OFFSETMASK, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "trans_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_ah_trans_deflev, 0, CTL_NET, PF_INET, IPPROTO_AH, IPSECCTL_DEF_AH_TRANSLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "net_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_ah_net_deflev, 0, CTL_NET, PF_INET, IPPROTO_AH, IPSECCTL_DEF_AH_NETLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READONLY, CTLTYPE_STRUCT, "ah_stats", NULL, NULL, 0, &ahstat, sizeof(ahstat), CTL_NET, PF_INET, IPPROTO_AH, CTL_CREATE, CTL_EOL); /* create net.inet.ipcomp */ sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ipcomp", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET, IPPROTO_IPCOMP, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READONLY, CTLTYPE_STRUCT, "ipcomp_stats", NULL, NULL, 0, &ipcompstat, sizeof(ipcompstat), CTL_NET, PF_INET, IPPROTO_IPCOMP, CTL_CREATE, CTL_EOL); /* create net.inet.ipsec subtree under dynamic oid */ sysctl_createv(clog, 0, NULL, &_ipsec, CTLFLAG_PERMANENT, CTLTYPE_NODE, "ipsec", NULL, NULL, 0, NULL, 0, CTL_NET, PF_INET, CTL_CREATE, CTL_EOL); ipproto_ipsec = (_ipsec != NULL) ? _ipsec->sysctl_num : 0; sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "def_policy", NULL, sysctl_fast_ipsec, 0, &ip4_def_policy.policy, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_DEF_POLICY, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "esp_trans_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_esp_trans_deflev, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_DEF_ESP_TRANSLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "esp_net_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_esp_net_deflev, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_DEF_ESP_NETLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ah_trans_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_ah_trans_deflev, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_DEF_AH_TRANSLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ah_net_deflev", NULL, sysctl_fast_ipsec, 0, &ip4_ah_net_deflev, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_DEF_AH_NETLEV, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ah_cleartos", NULL, NULL, 0, &ip4_ah_cleartos, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_AH_CLEARTOS, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ah_offsetmask", NULL, NULL, 0, &ip4_ah_offsetmask, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_AH_OFFSETMASK, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "dfbit", NULL, NULL, 0, &ip4_ipsec_dfbit, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_DFBIT, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "ecn", NULL, NULL, 0, &ip4_ipsec_ecn, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_ECN, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "debug", NULL, NULL, 0, &ipsec_debug, 0, CTL_NET, PF_INET, ipproto_ipsec, IPSECCTL_DEBUG, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READONLY, CTLTYPE_STRUCT, "ipsecstats", NULL, NULL, 0, &ipsecstat, sizeof(ipsecstat), CTL_NET, PF_INET, ipproto_ipsec, CTL_CREATE, CTL_EOL); #ifdef IPSEC_DEBUG sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "test_replay", SYSCTL_DESCR("Emulate replay attack"), sysctl_fast_ipsec_test, 0, &ipsec_replay, 0, CTL_NET, PF_INET, ipproto_ipsec, CTL_CREATE, CTL_EOL); sysctl_createv(clog, 0, NULL, NULL, CTLFLAG_PERMANENT|CTLFLAG_READWRITE, CTLTYPE_INT, "test_integrity", SYSCTL_DESCR("Emulate man-in-the-middle attack"), sysctl_fast_ipsec_test, 0, &ipsec_integrity, 0, CTL_NET, PF_INET, ipproto_ipsec, CTL_CREATE, CTL_EOL); #endif }