/*- * Copyright (c) 2016 Yandex LLC * Copyright (c) 2016 Andrey V. Elsukov * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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 __FBSDID("$FreeBSD$"); #include "opt_inet.h" #include "opt_inet6.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 #ifdef INET6 #include #endif #include #include #include static MALLOC_DEFINE(M_IPSEC, "ipsec", "IPsec Virtual Tunnel Interface"); static const char ipsecname[] = "ipsec"; #if defined(INET) && defined(INET6) #define IPSEC_SPCOUNT 4 #else #define IPSEC_SPCOUNT 2 #endif struct ipsec_softc { struct ifnet *ifp; struct rmlock lock; struct secpolicy *sp[IPSEC_SPCOUNT]; uint32_t reqid; u_int family; u_int fibnum; LIST_ENTRY(ipsec_softc) chain; LIST_ENTRY(ipsec_softc) hash; }; #define IPSEC_LOCK_INIT(sc) rm_init(&(sc)->lock, "if_ipsec softc") #define IPSEC_LOCK_DESTROY(sc) rm_destroy(&(sc)->lock) #define IPSEC_RLOCK_TRACKER struct rm_priotracker ipsec_tracker #define IPSEC_RLOCK(sc) rm_rlock(&(sc)->lock, &ipsec_tracker) #define IPSEC_RUNLOCK(sc) rm_runlock(&(sc)->lock, &ipsec_tracker) #define IPSEC_RLOCK_ASSERT(sc) rm_assert(&(sc)->lock, RA_RLOCKED) #define IPSEC_WLOCK(sc) rm_wlock(&(sc)->lock) #define IPSEC_WUNLOCK(sc) rm_wunlock(&(sc)->lock) #define IPSEC_WLOCK_ASSERT(sc) rm_assert(&(sc)->lock, RA_WLOCKED) static struct rmlock ipsec_sc_lock; RM_SYSINIT(ipsec_sc_lock, &ipsec_sc_lock, "if_ipsec softc list"); #define IPSEC_SC_RLOCK_TRACKER struct rm_priotracker ipsec_sc_tracker #define IPSEC_SC_RLOCK() rm_rlock(&ipsec_sc_lock, &ipsec_sc_tracker) #define IPSEC_SC_RUNLOCK() rm_runlock(&ipsec_sc_lock, &ipsec_sc_tracker) #define IPSEC_SC_RLOCK_ASSERT() rm_assert(&ipsec_sc_lock, RA_RLOCKED) #define IPSEC_SC_WLOCK() rm_wlock(&ipsec_sc_lock) #define IPSEC_SC_WUNLOCK() rm_wunlock(&ipsec_sc_lock) #define IPSEC_SC_WLOCK_ASSERT() rm_assert(&ipsec_sc_lock, RA_WLOCKED) LIST_HEAD(ipsec_iflist, ipsec_softc); static VNET_DEFINE(struct ipsec_iflist, ipsec_sc_list); static VNET_DEFINE(struct ipsec_iflist *, ipsec_sc_htbl); static VNET_DEFINE(u_long, ipsec_sc_hmask); #define V_ipsec_sc_list VNET(ipsec_sc_list) #define V_ipsec_sc_htbl VNET(ipsec_sc_htbl) #define V_ipsec_sc_hmask VNET(ipsec_sc_hmask) static uint32_t ipsec_hash(uint32_t id) { return (fnv_32_buf(&id, sizeof(id), FNV1_32_INIT)); } #define SCHASH_NHASH_LOG2 5 #define SCHASH_NHASH (1 << SCHASH_NHASH_LOG2) #define SCHASH_HASHVAL(id) (ipsec_hash((id)) & V_ipsec_sc_hmask) #define SCHASH_HASH(id) &V_ipsec_sc_htbl[SCHASH_HASHVAL(id)] /* * ipsec_ioctl_sx protects from concurrent ioctls. */ static struct sx ipsec_ioctl_sx; SX_SYSINIT(ipsec_ioctl_sx, &ipsec_ioctl_sx, "ipsec_ioctl"); static int ipsec_init_reqid(struct ipsec_softc *); static int ipsec_set_tunnel(struct ipsec_softc *, struct sockaddr *, struct sockaddr *, uint32_t); static void ipsec_delete_tunnel(struct ifnet *, int); static int ipsec_set_addresses(struct ifnet *, struct sockaddr *, struct sockaddr *); static int ipsec_set_reqid(struct ifnet *, uint32_t); static int ipsec_ioctl(struct ifnet *, u_long, caddr_t); static int ipsec_transmit(struct ifnet *, struct mbuf *); static int ipsec_output(struct ifnet *, struct mbuf *, const struct sockaddr *, struct route *); static void ipsec_qflush(struct ifnet *); static int ipsec_clone_create(struct if_clone *, int, caddr_t); static void ipsec_clone_destroy(struct ifnet *); static VNET_DEFINE(struct if_clone *, ipsec_cloner); #define V_ipsec_cloner VNET(ipsec_cloner) static int ipsec_clone_create(struct if_clone *ifc, int unit, caddr_t params) { struct ipsec_softc *sc; struct ifnet *ifp; sc = malloc(sizeof(*sc), M_IPSEC, M_WAITOK | M_ZERO); sc->fibnum = curthread->td_proc->p_fibnum; sc->ifp = ifp = if_alloc(IFT_TUNNEL); IPSEC_LOCK_INIT(sc); ifp->if_softc = sc; if_initname(ifp, ipsecname, unit); ifp->if_addrlen = 0; ifp->if_mtu = IPSEC_MTU; ifp->if_flags = IFF_POINTOPOINT | IFF_MULTICAST; ifp->if_ioctl = ipsec_ioctl; ifp->if_transmit = ipsec_transmit; ifp->if_qflush = ipsec_qflush; ifp->if_output = ipsec_output; if_attach(ifp); bpfattach(ifp, DLT_NULL, sizeof(uint32_t)); IPSEC_SC_WLOCK(); LIST_INSERT_HEAD(&V_ipsec_sc_list, sc, chain); IPSEC_SC_WUNLOCK(); return (0); } static void ipsec_clone_destroy(struct ifnet *ifp) { struct ipsec_softc *sc; sx_xlock(&ipsec_ioctl_sx); sc = ifp->if_softc; IPSEC_SC_WLOCK(); ipsec_delete_tunnel(ifp, 1); LIST_REMOVE(sc, chain); IPSEC_SC_WUNLOCK(); bpfdetach(ifp); if_detach(ifp); ifp->if_softc = NULL; sx_xunlock(&ipsec_ioctl_sx); if_free(ifp); IPSEC_LOCK_DESTROY(sc); free(sc, M_IPSEC); } static void vnet_ipsec_init(const void *unused __unused) { LIST_INIT(&V_ipsec_sc_list); V_ipsec_sc_htbl = hashinit(SCHASH_NHASH, M_IPSEC, &V_ipsec_sc_hmask); V_ipsec_cloner = if_clone_simple(ipsecname, ipsec_clone_create, ipsec_clone_destroy, 0); } VNET_SYSINIT(vnet_ipsec_init, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, vnet_ipsec_init, NULL); static void vnet_ipsec_uninit(const void *unused __unused) { if_clone_detach(V_ipsec_cloner); hashdestroy(V_ipsec_sc_htbl, M_IPSEC, V_ipsec_sc_hmask); } VNET_SYSUNINIT(vnet_ipsec_uninit, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY, vnet_ipsec_uninit, NULL); static struct secpolicy * ipsec_getpolicy(struct ipsec_softc *sc, int dir, sa_family_t af) { switch (af) { #ifdef INET case AF_INET: return (sc->sp[(dir == IPSEC_DIR_INBOUND ? 0: 1)]); #endif #ifdef INET6 case AF_INET6: return (sc->sp[(dir == IPSEC_DIR_INBOUND ? 0: 1) #ifdef INET + 2 #endif ]); #endif } return (NULL); } static struct secasindex * ipsec_getsaidx(struct ipsec_softc *sc, int dir, sa_family_t af) { struct secpolicy *sp; sp = ipsec_getpolicy(sc, dir, af); if (sp == NULL) return (NULL); return (&sp->req[0]->saidx); } static int ipsec_transmit(struct ifnet *ifp, struct mbuf *m) { IPSEC_RLOCK_TRACKER; struct ipsec_softc *sc; struct secpolicy *sp; struct ip *ip; uint32_t af; int error; #ifdef MAC error = mac_ifnet_check_transmit(ifp, m); if (error) { m_freem(m); goto err; } #endif error = ENETDOWN; sc = ifp->if_softc; if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || (ifp->if_flags & IFF_MONITOR) != 0 || (ifp->if_flags & IFF_UP) == 0) { m_freem(m); goto err; } /* Determine address family to correctly handle packet in BPF */ ip = mtod(m, struct ip *); switch (ip->ip_v) { #ifdef INET case IPVERSION: af = AF_INET; break; #endif #ifdef INET6 case (IPV6_VERSION >> 4): af = AF_INET6; break; #endif default: error = EAFNOSUPPORT; m_freem(m); goto err; } /* * Loop prevention. * XXX: for now just check presence of IPSEC_OUT_DONE mbuf tag. * We can read full chain and compare destination address, * proto and mode from xform_history with values from softc. */ if (m_tag_find(m, PACKET_TAG_IPSEC_OUT_DONE, NULL) != NULL) { m_freem(m); goto err; } IPSEC_RLOCK(sc); if (sc->family == 0) { IPSEC_RUNLOCK(sc); m_freem(m); goto err; } sp = ipsec_getpolicy(sc, IPSEC_DIR_OUTBOUND, af); key_addref(sp); M_SETFIB(m, sc->fibnum); IPSEC_RUNLOCK(sc); BPF_MTAP2(ifp, &af, sizeof(af), m); if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1); if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len); switch (af) { #ifdef INET case AF_INET: error = ipsec4_process_packet(m, sp, NULL); break; #endif #ifdef INET6 case AF_INET6: error = ipsec6_process_packet(m, sp, NULL); break; #endif default: panic("%s: unknown address family\n", __func__); } err: if (error != 0) if_inc_counter(ifp, IFCOUNTER_OERRORS, 1); return (error); } static void ipsec_qflush(struct ifnet *ifp __unused) { } static int ipsec_output(struct ifnet *ifp, struct mbuf *m, const struct sockaddr *dst, struct route *ro) { return (ifp->if_transmit(ifp, m)); } int ipsec_if_input(struct mbuf *m, struct secasvar *sav, uint32_t af) { IPSEC_SC_RLOCK_TRACKER; struct secasindex *saidx; struct ipsec_softc *sc; struct ifnet *ifp; if (sav->state != SADB_SASTATE_MATURE && sav->state != SADB_SASTATE_DYING) { m_freem(m); return (ENETDOWN); } if (sav->sah->saidx.mode != IPSEC_MODE_TUNNEL || sav->sah->saidx.proto != IPPROTO_ESP) return (0); IPSEC_SC_RLOCK(); /* * We only acquire SC_RLOCK() while we are doing search in * ipsec_sc_htbl. It is safe, because removing softc or changing * of reqid/addresses requires removing from hash table. */ LIST_FOREACH(sc, SCHASH_HASH(sav->sah->saidx.reqid), hash) { saidx = ipsec_getsaidx(sc, IPSEC_DIR_INBOUND, sav->sah->saidx.src.sa.sa_family); /* SA's reqid should match reqid in SP */ if (saidx == NULL || sav->sah->saidx.reqid != saidx->reqid) continue; /* SAH's addresses should match tunnel endpoints. */ if (key_sockaddrcmp(&sav->sah->saidx.dst.sa, &saidx->dst.sa, 0) != 0) continue; if (key_sockaddrcmp(&sav->sah->saidx.src.sa, &saidx->src.sa, 0) == 0) break; } if (sc == NULL) { IPSEC_SC_RUNLOCK(); /* Tunnel was not found. Nothing to do. */ return (0); } ifp = sc->ifp; if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0 || (ifp->if_flags & IFF_UP) == 0) { IPSEC_SC_RUNLOCK(); m_freem(m); return (ENETDOWN); } /* * We found matching and working tunnel. * Set its ifnet as receiving interface. */ m->m_pkthdr.rcvif = ifp; IPSEC_SC_RUNLOCK(); m_clrprotoflags(m); M_SETFIB(m, ifp->if_fib); BPF_MTAP2(ifp, &af, sizeof(af), m); if_inc_counter(ifp, IFCOUNTER_IPACKETS, 1); if_inc_counter(ifp, IFCOUNTER_IBYTES, m->m_pkthdr.len); if ((ifp->if_flags & IFF_MONITOR) != 0) { m_freem(m); return (ENETDOWN); } return (0); } /* XXX how should we handle IPv6 scope on SIOC[GS]IFPHYADDR? */ int ipsec_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data) { IPSEC_RLOCK_TRACKER; struct ifreq *ifr = (struct ifreq*)data; struct sockaddr *dst, *src; struct ipsec_softc *sc; struct secasindex *saidx; #ifdef INET struct sockaddr_in *sin = NULL; #endif #ifdef INET6 struct sockaddr_in6 *sin6 = NULL; #endif uint32_t reqid; int error; switch (cmd) { case SIOCSIFADDR: ifp->if_flags |= IFF_UP; case SIOCADDMULTI: case SIOCDELMULTI: case SIOCGIFMTU: case SIOCSIFFLAGS: return (0); case SIOCSIFMTU: if (ifr->ifr_mtu < IPSEC_MTU_MIN || ifr->ifr_mtu > IPSEC_MTU_MAX) return (EINVAL); else ifp->if_mtu = ifr->ifr_mtu; return (0); } sx_xlock(&ipsec_ioctl_sx); sc = ifp->if_softc; /* Check that softc is still here */ if (sc == NULL) { error = ENXIO; goto bad; } error = 0; switch (cmd) { case SIOCSIFPHYADDR: #ifdef INET6 case SIOCSIFPHYADDR_IN6: #endif error = EINVAL; switch (cmd) { #ifdef INET case SIOCSIFPHYADDR: src = (struct sockaddr *) &(((struct in_aliasreq *)data)->ifra_addr); dst = (struct sockaddr *) &(((struct in_aliasreq *)data)->ifra_dstaddr); break; #endif #ifdef INET6 case SIOCSIFPHYADDR_IN6: src = (struct sockaddr *) &(((struct in6_aliasreq *)data)->ifra_addr); dst = (struct sockaddr *) &(((struct in6_aliasreq *)data)->ifra_dstaddr); break; #endif default: goto bad; } /* sa_family must be equal */ if (src->sa_family != dst->sa_family || src->sa_len != dst->sa_len) goto bad; /* validate sa_len */ switch (src->sa_family) { #ifdef INET case AF_INET: if (src->sa_len != sizeof(struct sockaddr_in)) goto bad; break; #endif #ifdef INET6 case AF_INET6: if (src->sa_len != sizeof(struct sockaddr_in6)) goto bad; break; #endif default: error = EAFNOSUPPORT; goto bad; } /* check sa_family looks sane for the cmd */ error = EAFNOSUPPORT; switch (cmd) { #ifdef INET case SIOCSIFPHYADDR: if (src->sa_family == AF_INET) break; goto bad; #endif #ifdef INET6 case SIOCSIFPHYADDR_IN6: if (src->sa_family == AF_INET6) break; goto bad; #endif } error = EADDRNOTAVAIL; switch (src->sa_family) { #ifdef INET case AF_INET: if (satosin(src)->sin_addr.s_addr == INADDR_ANY || satosin(dst)->sin_addr.s_addr == INADDR_ANY) goto bad; break; #endif #ifdef INET6 case AF_INET6: if (IN6_IS_ADDR_UNSPECIFIED(&satosin6(src)->sin6_addr) || IN6_IS_ADDR_UNSPECIFIED(&satosin6(dst)->sin6_addr)) goto bad; /* * Check validity of the scope zone ID of the * addresses, and convert it into the kernel * internal form if necessary. */ error = sa6_embedscope(satosin6(src), 0); if (error != 0) goto bad; error = sa6_embedscope(satosin6(dst), 0); if (error != 0) goto bad; #endif }; error = ipsec_set_addresses(ifp, src, dst); break; case SIOCDIFPHYADDR: ipsec_delete_tunnel(ifp, 0); break; case SIOCGIFPSRCADDR: case SIOCGIFPDSTADDR: #ifdef INET6 case SIOCGIFPSRCADDR_IN6: case SIOCGIFPDSTADDR_IN6: #endif IPSEC_RLOCK(sc); if (sc->family == 0) { IPSEC_RUNLOCK(sc); error = EADDRNOTAVAIL; break; } saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND, sc->family); switch (cmd) { #ifdef INET case SIOCGIFPSRCADDR: case SIOCGIFPDSTADDR: if (saidx->src.sa.sa_family != AF_INET) { error = EADDRNOTAVAIL; break; } sin = (struct sockaddr_in *)&ifr->ifr_addr; memset(sin, 0, sizeof(*sin)); sin->sin_family = AF_INET; sin->sin_len = sizeof(*sin); break; #endif #ifdef INET6 case SIOCGIFPSRCADDR_IN6: case SIOCGIFPDSTADDR_IN6: if (saidx->src.sa.sa_family != AF_INET6) { error = EADDRNOTAVAIL; break; } sin6 = (struct sockaddr_in6 *) &(((struct in6_ifreq *)data)->ifr_addr); memset(sin6, 0, sizeof(*sin6)); sin6->sin6_family = AF_INET6; sin6->sin6_len = sizeof(*sin6); break; #endif default: error = EAFNOSUPPORT; } if (error == 0) { switch (cmd) { #ifdef INET case SIOCGIFPSRCADDR: sin->sin_addr = saidx->src.sin.sin_addr; break; case SIOCGIFPDSTADDR: sin->sin_addr = saidx->dst.sin.sin_addr; break; #endif #ifdef INET6 case SIOCGIFPSRCADDR_IN6: sin6->sin6_addr = saidx->src.sin6.sin6_addr; break; case SIOCGIFPDSTADDR_IN6: sin6->sin6_addr = saidx->dst.sin6.sin6_addr; break; #endif } } IPSEC_RUNLOCK(sc); if (error != 0) break; switch (cmd) { #ifdef INET case SIOCGIFPSRCADDR: case SIOCGIFPDSTADDR: error = prison_if(curthread->td_ucred, (struct sockaddr *)sin); if (error != 0) memset(sin, 0, sizeof(*sin)); break; #endif #ifdef INET6 case SIOCGIFPSRCADDR_IN6: case SIOCGIFPDSTADDR_IN6: error = prison_if(curthread->td_ucred, (struct sockaddr *)sin6); if (error == 0) error = sa6_recoverscope(sin6); if (error != 0) memset(sin6, 0, sizeof(*sin6)); #endif } break; case SIOCGTUNFIB: ifr->ifr_fib = sc->fibnum; break; case SIOCSTUNFIB: if ((error = priv_check(curthread, PRIV_NET_SETIFFIB)) != 0) break; if (ifr->ifr_fib >= rt_numfibs) error = EINVAL; else sc->fibnum = ifr->ifr_fib; break; case IPSECGREQID: reqid = sc->reqid; error = copyout(&reqid, ifr_data_get_ptr(ifr), sizeof(reqid)); break; case IPSECSREQID: if ((error = priv_check(curthread, PRIV_NET_SETIFCAP)) != 0) break; error = copyin(ifr_data_get_ptr(ifr), &reqid, sizeof(reqid)); if (error != 0) break; error = ipsec_set_reqid(ifp, reqid); break; default: error = EINVAL; break; } bad: sx_xunlock(&ipsec_ioctl_sx); return (error); } /* * Allocate new private security policies for tunneling interface. * Each tunneling interface has following security policies for * both AF: * 0.0.0.0/0[any] 0.0.0.0/0[any] -P in \ * ipsec esp/tunnel/RemoteIP-LocalIP/unique:reqid * 0.0.0.0/0[any] 0.0.0.0/0[any] -P out \ * ipsec esp/tunnel/LocalIP-RemoteIP/unique:reqid */ static int ipsec_newpolicies(struct ipsec_softc *sc, struct secpolicy *sp[IPSEC_SPCOUNT], const struct sockaddr *src, const struct sockaddr *dst, uint32_t reqid) { struct ipsecrequest *isr; int i; memset(sp, 0, sizeof(struct secpolicy *) * IPSEC_SPCOUNT); for (i = 0; i < IPSEC_SPCOUNT; i++) { if ((sp[i] = key_newsp()) == NULL) goto fail; if ((isr = ipsec_newisr()) == NULL) goto fail; sp[i]->policy = IPSEC_POLICY_IPSEC; sp[i]->state = IPSEC_SPSTATE_DEAD; sp[i]->req[sp[i]->tcount++] = isr; sp[i]->created = time_second; /* Use priority field to store if_index */ sp[i]->priority = sc->ifp->if_index; isr->level = IPSEC_LEVEL_UNIQUE; isr->saidx.proto = IPPROTO_ESP; isr->saidx.mode = IPSEC_MODE_TUNNEL; isr->saidx.reqid = reqid; if (i % 2 == 0) { sp[i]->spidx.dir = IPSEC_DIR_INBOUND; bcopy(src, &isr->saidx.dst, src->sa_len); bcopy(dst, &isr->saidx.src, dst->sa_len); } else { sp[i]->spidx.dir = IPSEC_DIR_OUTBOUND; bcopy(src, &isr->saidx.src, src->sa_len); bcopy(dst, &isr->saidx.dst, dst->sa_len); } sp[i]->spidx.ul_proto = IPSEC_ULPROTO_ANY; #ifdef INET if (i < 2) { sp[i]->spidx.src.sa.sa_family = sp[i]->spidx.dst.sa.sa_family = AF_INET; sp[i]->spidx.src.sa.sa_len = sp[i]->spidx.dst.sa.sa_len = sizeof(struct sockaddr_in); continue; } #endif #ifdef INET6 sp[i]->spidx.src.sa.sa_family = sp[i]->spidx.dst.sa.sa_family = AF_INET6; sp[i]->spidx.src.sa.sa_len = sp[i]->spidx.dst.sa.sa_len = sizeof(struct sockaddr_in6); #endif } return (0); fail: for (i = 0; i < IPSEC_SPCOUNT; i++) key_freesp(&sp[i]); return (ENOMEM); } static int ipsec_check_reqid(uint32_t reqid) { struct ipsec_softc *sc; IPSEC_SC_RLOCK_ASSERT(); LIST_FOREACH(sc, &V_ipsec_sc_list, chain) { if (sc->reqid == reqid) return (EEXIST); } return (0); } /* * We use key_newreqid() to automatically obtain unique reqid. * Then we check that given id is unique, i.e. it is not used by * another if_ipsec(4) interface. This macro limits the number of * tries to get unique id. */ #define IPSEC_REQID_TRYCNT 64 static int ipsec_init_reqid(struct ipsec_softc *sc) { uint32_t reqid; int trycount; IPSEC_SC_RLOCK_ASSERT(); if (sc->reqid != 0) /* already initialized */ return (0); trycount = IPSEC_REQID_TRYCNT; while (--trycount > 0) { reqid = key_newreqid(); if (ipsec_check_reqid(reqid) == 0) break; } if (trycount == 0) return (EEXIST); sc->reqid = reqid; return (0); } /* * Set or update reqid for given tunneling interface. * When specified reqid is zero, generate new one. * We are protected by ioctl_sx lock from concurrent id generation. * Also softc would not disappear while we hold ioctl_sx lock. */ static int ipsec_set_reqid(struct ifnet *ifp, uint32_t reqid) { IPSEC_SC_RLOCK_TRACKER; struct ipsec_softc *sc; struct secasindex *saidx; sx_assert(&ipsec_ioctl_sx, SA_XLOCKED); sc = ifp->if_softc; if (sc->reqid == reqid && reqid != 0) return (0); IPSEC_SC_RLOCK(); if (reqid != 0) { /* Check that specified reqid doesn't exist */ if (ipsec_check_reqid(reqid) != 0) { IPSEC_SC_RUNLOCK(); return (EEXIST); } sc->reqid = reqid; } else { /* Generate new reqid */ if (ipsec_init_reqid(sc) != 0) { IPSEC_SC_RUNLOCK(); return (EEXIST); } } IPSEC_SC_RUNLOCK(); /* Tunnel isn't fully configured, just return. */ if (sc->family == 0) return (0); saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND, sc->family); KASSERT(saidx != NULL, ("saidx is NULL, but family is %d", sc->family)); return (ipsec_set_tunnel(sc, &saidx->src.sa, &saidx->dst.sa, sc->reqid)); } /* * Set tunnel endpoints addresses. */ static int ipsec_set_addresses(struct ifnet *ifp, struct sockaddr *src, struct sockaddr *dst) { IPSEC_SC_RLOCK_TRACKER; struct ipsec_softc *sc, *tsc; struct secasindex *saidx; sx_assert(&ipsec_ioctl_sx, SA_XLOCKED); sc = ifp->if_softc; if (sc->family != 0) { saidx = ipsec_getsaidx(sc, IPSEC_DIR_OUTBOUND, src->sa_family); if (saidx != NULL && saidx->reqid == sc->reqid && key_sockaddrcmp(&saidx->src.sa, src, 0) == 0 && key_sockaddrcmp(&saidx->dst.sa, dst, 0) == 0) return (0); /* Nothing has been changed. */ } /* * We cannot service IPsec tunnel when source address is * not our own. */ #ifdef INET if (src->sa_family == AF_INET && in_localip(satosin(src)->sin_addr) == 0) return (EADDRNOTAVAIL); #endif #ifdef INET6 /* * NOTE: IPv6 addresses are in kernel internal form with * embedded scope zone id. */ if (src->sa_family == AF_INET6 && in6_localip(&satosin6(src)->sin6_addr) == 0) return (EADDRNOTAVAIL); #endif /* Check that given addresses aren't already configured */ IPSEC_SC_RLOCK(); LIST_FOREACH(tsc, &V_ipsec_sc_list, chain) { if (tsc == sc || tsc->family != src->sa_family) continue; saidx = ipsec_getsaidx(tsc, IPSEC_DIR_OUTBOUND, tsc->family); if (key_sockaddrcmp(&saidx->src.sa, src, 0) == 0 && key_sockaddrcmp(&saidx->dst.sa, dst, 0) == 0) { /* We already have tunnel with such addresses */ IPSEC_SC_RUNLOCK(); return (EADDRNOTAVAIL); } } /* If reqid is not set, generate new one. */ if (ipsec_init_reqid(sc) != 0) { IPSEC_SC_RUNLOCK(); return (EEXIST); } IPSEC_SC_RUNLOCK(); return (ipsec_set_tunnel(sc, src, dst, sc->reqid)); } static int ipsec_set_tunnel(struct ipsec_softc *sc, struct sockaddr *src, struct sockaddr *dst, uint32_t reqid) { struct secpolicy *sp[IPSEC_SPCOUNT]; struct secpolicy *oldsp[IPSEC_SPCOUNT]; int i, f; sx_assert(&ipsec_ioctl_sx, SA_XLOCKED); /* Allocate SP with new addresses. */ if (ipsec_newpolicies(sc, sp, src, dst, reqid) == 0) { /* Add new policies to SPDB */ if (key_register_ifnet(sp, IPSEC_SPCOUNT) != 0) { for (i = 0; i < IPSEC_SPCOUNT; i++) key_freesp(&sp[i]); return (EAGAIN); } IPSEC_SC_WLOCK(); if ((f = sc->family) != 0) LIST_REMOVE(sc, hash); IPSEC_WLOCK(sc); for (i = 0; i < IPSEC_SPCOUNT; i++) { oldsp[i] = sc->sp[i]; sc->sp[i] = sp[i]; } sc->family = src->sa_family; IPSEC_WUNLOCK(sc); LIST_INSERT_HEAD(SCHASH_HASH(sc->reqid), sc, hash); IPSEC_SC_WUNLOCK(); } else { sc->ifp->if_drv_flags &= ~IFF_DRV_RUNNING; return (ENOMEM); } sc->ifp->if_drv_flags |= IFF_DRV_RUNNING; if (f != 0) { key_unregister_ifnet(oldsp, IPSEC_SPCOUNT); for (i = 0; i < IPSEC_SPCOUNT; i++) key_freesp(&oldsp[i]); } return (0); } static void ipsec_delete_tunnel(struct ifnet *ifp, int locked) { struct ipsec_softc *sc = ifp->if_softc; struct secpolicy *oldsp[IPSEC_SPCOUNT]; int i; sx_assert(&ipsec_ioctl_sx, SA_XLOCKED); ifp->if_drv_flags &= ~IFF_DRV_RUNNING; if (sc->family != 0) { if (!locked) IPSEC_SC_WLOCK(); /* Remove from hash table */ LIST_REMOVE(sc, hash); IPSEC_WLOCK(sc); for (i = 0; i < IPSEC_SPCOUNT; i++) { oldsp[i] = sc->sp[i]; sc->sp[i] = NULL; } sc->family = 0; IPSEC_WUNLOCK(sc); if (!locked) IPSEC_SC_WUNLOCK(); key_unregister_ifnet(oldsp, IPSEC_SPCOUNT); for (i = 0; i < IPSEC_SPCOUNT; i++) key_freesp(&oldsp[i]); } }