/* * CDDL HEADER START * * The contents of this file are subject to the terms of the * Common Development and Distribution License (the "License"). * You may not use this file except in compliance with the License. * * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE * or http://www.opensolaris.org/os/licensing. * See the License for the specific language governing permissions * and limitations under the License. * * When distributing Covered Code, include this CDDL HEADER in each * file and include the License file at usr/src/OPENSOLARIS.LICENSE. * If applicable, add the following below this CDDL HEADER, with the * fields enclosed by brackets "[]" replaced with your own identifying * information: Portions Copyright [yyyy] [name of copyright owner] * * CDDL HEADER END */ /* * Copyright 2010 Sun Microsystems, Inc. All rights reserved. * Use is subject to license terms. */ /* * iptun - IP Tunneling Driver * * This module is a GLDv3 driver that implements virtual datalinks over IP * (a.k.a, IP tunneling). The datalinks are managed through a dld ioctl * interface (see iptun_ctl.c), and registered with GLDv3 using * mac_register(). It implements the logic for various forms of IP (IPv4 or * IPv6) encapsulation within IP (IPv4 or IPv6) by interacting with the ip * module below it. Each virtual IP tunnel datalink has a conn_t associated * with it representing the "outer" IP connection. * * The module implements the following locking semantics: * * Lookups and deletions in iptun_hash are synchronized using iptun_hash_lock. * See comments above iptun_hash_lock for details. * * No locks are ever held while calling up to GLDv3. The general architecture * of GLDv3 requires this, as the mac perimeter (essentially a lock) for a * given link will be held while making downcalls (iptun_m_*() callbacks). * Because we need to hold locks while handling downcalls, holding these locks * while issuing upcalls results in deadlock scenarios. See the block comment * above iptun_task_cb() for details on how we safely issue upcalls without * holding any locks. * * The contents of each iptun_t is protected by an iptun_mutex which is held * in iptun_enter() (called by iptun_enter_by_linkid()), and exited in * iptun_exit(). * * See comments in iptun_delete() and iptun_free() for details on how the * iptun_t is deleted safely. */ #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 "iptun_impl.h" /* Do the tunnel type and address family match? */ #define IPTUN_ADDR_MATCH(iptun_type, family) \ ((iptun_type == IPTUN_TYPE_IPV4 && family == AF_INET) || \ (iptun_type == IPTUN_TYPE_IPV6 && family == AF_INET6) || \ (iptun_type == IPTUN_TYPE_6TO4 && family == AF_INET)) #define IPTUN_HASH_KEY(key) ((mod_hash_key_t)(uintptr_t)(key)) #define IPTUN_MIN_IPV4_MTU 576 /* ip.h still uses 68 (!) */ #define IPTUN_MIN_IPV6_MTU IPV6_MIN_MTU #define IPTUN_MAX_IPV4_MTU (IP_MAXPACKET - sizeof (ipha_t)) #define IPTUN_MAX_IPV6_MTU (IP_MAXPACKET - sizeof (ip6_t) - \ sizeof (iptun_encaplim_t)) #define IPTUN_MIN_HOPLIMIT 1 #define IPTUN_MAX_HOPLIMIT UINT8_MAX #define IPTUN_MIN_ENCAPLIMIT 0 #define IPTUN_MAX_ENCAPLIMIT UINT8_MAX #define IPTUN_IPSEC_REQ_MASK (IPSEC_PREF_REQUIRED | IPSEC_PREF_NEVER) static iptun_encaplim_t iptun_encaplim_init = { { IPPROTO_NONE, 0 }, IP6OPT_TUNNEL_LIMIT, 1, IPTUN_DEFAULT_ENCAPLIMIT, /* filled in with actual value later */ IP6OPT_PADN, 1, 0 }; /* * Table containing per-iptun-type information. * Since IPv6 can run over all of these we have the IPv6 min as the min MTU. */ static iptun_typeinfo_t iptun_type_table[] = { { IPTUN_TYPE_IPV4, MAC_PLUGIN_IDENT_IPV4, IPV4_VERSION, IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU, B_TRUE }, { IPTUN_TYPE_IPV6, MAC_PLUGIN_IDENT_IPV6, IPV6_VERSION, IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV6_MTU, B_TRUE }, { IPTUN_TYPE_6TO4, MAC_PLUGIN_IDENT_6TO4, IPV4_VERSION, IPTUN_MIN_IPV6_MTU, IPTUN_MAX_IPV4_MTU, B_FALSE }, { IPTUN_TYPE_UNKNOWN, NULL, 0, 0, 0, B_FALSE } }; /* * iptun_hash is an iptun_t lookup table by link ID protected by * iptun_hash_lock. While the hash table's integrity is maintained via * internal locking in the mod_hash_*() functions, we need additional locking * so that an iptun_t cannot be deleted after a hash lookup has returned an * iptun_t and before iptun_lock has been entered. As such, we use * iptun_hash_lock when doing lookups and removals from iptun_hash. */ mod_hash_t *iptun_hash; static kmutex_t iptun_hash_lock; static uint_t iptun_tunnelcount; /* total for all stacks */ kmem_cache_t *iptun_cache; ddi_taskq_t *iptun_taskq; typedef enum { IPTUN_TASK_MTU_UPDATE, /* tell mac about new tunnel link MTU */ IPTUN_TASK_LADDR_UPDATE, /* tell mac about new local address */ IPTUN_TASK_RADDR_UPDATE, /* tell mac about new remote address */ IPTUN_TASK_LINK_UPDATE, /* tell mac about new link state */ IPTUN_TASK_PDATA_UPDATE /* tell mac about updated plugin data */ } iptun_task_t; typedef struct iptun_task_data_s { iptun_task_t itd_task; datalink_id_t itd_linkid; } iptun_task_data_t; static void iptun_task_dispatch(iptun_t *, iptun_task_t); static int iptun_enter(iptun_t *); static void iptun_exit(iptun_t *); static void iptun_headergen(iptun_t *, boolean_t); static void iptun_drop_pkt(mblk_t *, uint64_t *); static void iptun_input(void *, mblk_t *, void *, ip_recv_attr_t *); static void iptun_input_icmp(void *, mblk_t *, void *, ip_recv_attr_t *); static void iptun_output(iptun_t *, mblk_t *); static uint32_t iptun_get_maxmtu(iptun_t *, ip_xmit_attr_t *, uint32_t); static uint32_t iptun_update_mtu(iptun_t *, ip_xmit_attr_t *, uint32_t); static uint32_t iptun_get_dst_pmtu(iptun_t *, ip_xmit_attr_t *); static void iptun_update_dst_pmtu(iptun_t *, ip_xmit_attr_t *); static int iptun_setladdr(iptun_t *, const struct sockaddr_storage *); static void iptun_output_6to4(iptun_t *, mblk_t *); static void iptun_output_common(iptun_t *, ip_xmit_attr_t *, mblk_t *); static boolean_t iptun_verifyicmp(conn_t *, void *, icmph_t *, icmp6_t *, ip_recv_attr_t *); static void iptun_notify(void *, ip_xmit_attr_t *, ixa_notify_type_t, ixa_notify_arg_t); static mac_callbacks_t iptun_m_callbacks; static int iptun_m_getstat(void *arg, uint_t stat, uint64_t *val) { iptun_t *iptun = arg; int err = 0; switch (stat) { case MAC_STAT_IERRORS: *val = iptun->iptun_ierrors; break; case MAC_STAT_OERRORS: *val = iptun->iptun_oerrors; break; case MAC_STAT_RBYTES: *val = iptun->iptun_rbytes; break; case MAC_STAT_IPACKETS: *val = iptun->iptun_ipackets; break; case MAC_STAT_OBYTES: *val = iptun->iptun_obytes; break; case MAC_STAT_OPACKETS: *val = iptun->iptun_opackets; break; case MAC_STAT_NORCVBUF: *val = iptun->iptun_norcvbuf; break; case MAC_STAT_NOXMTBUF: *val = iptun->iptun_noxmtbuf; break; default: err = ENOTSUP; } return (err); } static int iptun_m_start(void *arg) { iptun_t *iptun = arg; int err; if ((err = iptun_enter(iptun)) == 0) { iptun->iptun_flags |= IPTUN_MAC_STARTED; iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE); iptun_exit(iptun); } return (err); } static void iptun_m_stop(void *arg) { iptun_t *iptun = arg; if (iptun_enter(iptun) == 0) { iptun->iptun_flags &= ~IPTUN_MAC_STARTED; iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE); iptun_exit(iptun); } } /* * iptun_m_setpromisc() does nothing and always succeeds. This is because a * tunnel data-link only ever receives packets that are destined exclusively * for the local address of the tunnel. */ /* ARGSUSED */ static int iptun_m_setpromisc(void *arg, boolean_t on) { return (0); } /* ARGSUSED */ static int iptun_m_multicst(void *arg, boolean_t add, const uint8_t *addrp) { return (ENOTSUP); } /* * iptun_m_unicst() sets the local address. */ /* ARGSUSED */ static int iptun_m_unicst(void *arg, const uint8_t *addrp) { iptun_t *iptun = arg; int err; struct sockaddr_storage ss; struct sockaddr_in *sin; struct sockaddr_in6 *sin6; if ((err = iptun_enter(iptun)) == 0) { switch (iptun->iptun_typeinfo->iti_ipvers) { case IPV4_VERSION: sin = (struct sockaddr_in *)&ss; sin->sin_family = AF_INET; bcopy(addrp, &sin->sin_addr, sizeof (in_addr_t)); break; case IPV6_VERSION: sin6 = (struct sockaddr_in6 *)&ss; sin6->sin6_family = AF_INET6; bcopy(addrp, &sin6->sin6_addr, sizeof (in6_addr_t)); break; default: ASSERT(0); } err = iptun_setladdr(iptun, &ss); iptun_exit(iptun); } return (err); } static mblk_t * iptun_m_tx(void *arg, mblk_t *mpchain) { mblk_t *mp, *nmp; iptun_t *iptun = arg; if (!IS_IPTUN_RUNNING(iptun)) { iptun_drop_pkt(mpchain, &iptun->iptun_noxmtbuf); return (NULL); } for (mp = mpchain; mp != NULL; mp = nmp) { nmp = mp->b_next; mp->b_next = NULL; iptun_output(iptun, mp); } return (NULL); } /* ARGSUSED */ static int iptun_m_setprop(void *barg, const char *pr_name, mac_prop_id_t pr_num, uint_t pr_valsize, const void *pr_val) { iptun_t *iptun = barg; uint32_t value = *(uint32_t *)pr_val; int err; /* * We need to enter this iptun_t since we'll be modifying the outer * header. */ if ((err = iptun_enter(iptun)) != 0) return (err); switch (pr_num) { case MAC_PROP_IPTUN_HOPLIMIT: if (value < IPTUN_MIN_HOPLIMIT || value > IPTUN_MAX_HOPLIMIT) { err = EINVAL; break; } if (value != iptun->iptun_hoplimit) { iptun->iptun_hoplimit = (uint8_t)value; iptun_headergen(iptun, B_TRUE); } break; case MAC_PROP_IPTUN_ENCAPLIMIT: if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_IPV6 || value > IPTUN_MAX_ENCAPLIMIT) { err = EINVAL; break; } if (value != iptun->iptun_encaplimit) { iptun->iptun_encaplimit = (uint8_t)value; iptun_headergen(iptun, B_TRUE); } break; case MAC_PROP_MTU: { uint32_t maxmtu = iptun_get_maxmtu(iptun, NULL, 0); if (value < iptun->iptun_typeinfo->iti_minmtu || value > maxmtu) { err = EINVAL; break; } iptun->iptun_flags |= IPTUN_FIXED_MTU; if (value != iptun->iptun_mtu) { iptun->iptun_mtu = value; iptun_task_dispatch(iptun, IPTUN_TASK_MTU_UPDATE); } break; } default: err = EINVAL; } iptun_exit(iptun); return (err); } /* ARGSUSED */ static int iptun_m_getprop(void *barg, const char *pr_name, mac_prop_id_t pr_num, uint_t pr_valsize, void *pr_val) { iptun_t *iptun = barg; int err; if ((err = iptun_enter(iptun)) != 0) return (err); switch (pr_num) { case MAC_PROP_IPTUN_HOPLIMIT: ASSERT(pr_valsize >= sizeof (uint32_t)); *(uint32_t *)pr_val = iptun->iptun_hoplimit; break; case MAC_PROP_IPTUN_ENCAPLIMIT: *(uint32_t *)pr_val = iptun->iptun_encaplimit; break; default: err = ENOTSUP; } done: iptun_exit(iptun); return (err); } /* ARGSUSED */ static void iptun_m_propinfo(void *barg, const char *pr_name, mac_prop_id_t pr_num, mac_prop_info_handle_t prh) { iptun_t *iptun = barg; switch (pr_num) { case MAC_PROP_IPTUN_HOPLIMIT: mac_prop_info_set_range_uint32(prh, IPTUN_MIN_HOPLIMIT, IPTUN_MAX_HOPLIMIT); mac_prop_info_set_default_uint32(prh, IPTUN_DEFAULT_HOPLIMIT); break; case MAC_PROP_IPTUN_ENCAPLIMIT: if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_IPV6) break; mac_prop_info_set_range_uint32(prh, IPTUN_MIN_ENCAPLIMIT, IPTUN_MAX_ENCAPLIMIT); mac_prop_info_set_default_uint32(prh, IPTUN_DEFAULT_ENCAPLIMIT); break; case MAC_PROP_MTU: mac_prop_info_set_range_uint32(prh, iptun->iptun_typeinfo->iti_minmtu, iptun_get_maxmtu(iptun, NULL, 0)); break; } } uint_t iptun_count(void) { return (iptun_tunnelcount); } /* * Enter an iptun_t exclusively. This is essentially just a mutex, but we * don't allow iptun_enter() to succeed on a tunnel if it's in the process of * being deleted. */ static int iptun_enter(iptun_t *iptun) { mutex_enter(&iptun->iptun_lock); while (iptun->iptun_flags & IPTUN_DELETE_PENDING) cv_wait(&iptun->iptun_enter_cv, &iptun->iptun_lock); if (iptun->iptun_flags & IPTUN_CONDEMNED) { mutex_exit(&iptun->iptun_lock); return (ENOENT); } return (0); } /* * Exit the tunnel entered in iptun_enter(). */ static void iptun_exit(iptun_t *iptun) { mutex_exit(&iptun->iptun_lock); } /* * Enter the IP tunnel instance by datalink ID. */ static int iptun_enter_by_linkid(datalink_id_t linkid, iptun_t **iptun) { int err; mutex_enter(&iptun_hash_lock); if (mod_hash_find(iptun_hash, IPTUN_HASH_KEY(linkid), (mod_hash_val_t *)iptun) == 0) err = iptun_enter(*iptun); else err = ENOENT; if (err != 0) *iptun = NULL; mutex_exit(&iptun_hash_lock); return (err); } /* * Handle tasks that were deferred through the iptun_taskq because they require * calling up to the mac module, and we can't call up to the mac module while * holding locks. * * This is tricky to get right without introducing race conditions and * deadlocks with the mac module, as we cannot issue an upcall while in the * iptun_t. The reason is that upcalls may try and enter the mac perimeter, * while iptun callbacks (such as iptun_m_setprop()) called from the mac * module will already have the perimeter held, and will then try and enter * the iptun_t. You can see the lock ordering problem with this; this will * deadlock. * * The safe way to do this is to enter the iptun_t in question and copy the * information we need out of it so that we can exit it and know that the * information being passed up to the upcalls won't be subject to modification * by other threads. The problem now is that we need to exit it prior to * issuing the upcall, but once we do this, a thread could come along and * delete the iptun_t and thus the mac handle required to issue the upcall. * To prevent this, we set the IPTUN_UPCALL_PENDING flag prior to exiting the * iptun_t. This flag is the condition associated with iptun_upcall_cv, which * iptun_delete() will cv_wait() on. When the upcall completes, we clear * IPTUN_UPCALL_PENDING and cv_signal() any potentially waiting * iptun_delete(). We can thus still safely use iptun->iptun_mh after having * exited the iptun_t. */ static void iptun_task_cb(void *arg) { iptun_task_data_t *itd = arg; iptun_task_t task = itd->itd_task; datalink_id_t linkid = itd->itd_linkid; iptun_t *iptun; uint32_t mtu; iptun_addr_t addr; link_state_t linkstate; size_t header_size; iptun_header_t header; kmem_free(itd, sizeof (*itd)); /* * Note that if the lookup fails, it's because the tunnel was deleted * between the time the task was dispatched and now. That isn't an * error. */ if (iptun_enter_by_linkid(linkid, &iptun) != 0) return; iptun->iptun_flags |= IPTUN_UPCALL_PENDING; switch (task) { case IPTUN_TASK_MTU_UPDATE: mtu = iptun->iptun_mtu; break; case IPTUN_TASK_LADDR_UPDATE: addr = iptun->iptun_laddr; break; case IPTUN_TASK_RADDR_UPDATE: addr = iptun->iptun_raddr; break; case IPTUN_TASK_LINK_UPDATE: linkstate = IS_IPTUN_RUNNING(iptun) ? LINK_STATE_UP : LINK_STATE_DOWN; break; case IPTUN_TASK_PDATA_UPDATE: header_size = iptun->iptun_header_size; header = iptun->iptun_header; break; default: ASSERT(0); } iptun_exit(iptun); switch (task) { case IPTUN_TASK_MTU_UPDATE: (void) mac_maxsdu_update(iptun->iptun_mh, mtu); break; case IPTUN_TASK_LADDR_UPDATE: mac_unicst_update(iptun->iptun_mh, (uint8_t *)&addr.ia_addr); break; case IPTUN_TASK_RADDR_UPDATE: mac_dst_update(iptun->iptun_mh, (uint8_t *)&addr.ia_addr); break; case IPTUN_TASK_LINK_UPDATE: mac_link_update(iptun->iptun_mh, linkstate); break; case IPTUN_TASK_PDATA_UPDATE: if (mac_pdata_update(iptun->iptun_mh, header_size == 0 ? NULL : &header, header_size) != 0) atomic_inc_64(&iptun->iptun_taskq_fail); break; } mutex_enter(&iptun->iptun_lock); iptun->iptun_flags &= ~IPTUN_UPCALL_PENDING; cv_signal(&iptun->iptun_upcall_cv); mutex_exit(&iptun->iptun_lock); } static void iptun_task_dispatch(iptun_t *iptun, iptun_task_t iptun_task) { iptun_task_data_t *itd; itd = kmem_alloc(sizeof (*itd), KM_NOSLEEP); if (itd == NULL) { atomic_inc_64(&iptun->iptun_taskq_fail); return; } itd->itd_task = iptun_task; itd->itd_linkid = iptun->iptun_linkid; if (ddi_taskq_dispatch(iptun_taskq, iptun_task_cb, itd, DDI_NOSLEEP)) { atomic_inc_64(&iptun->iptun_taskq_fail); kmem_free(itd, sizeof (*itd)); } } /* * Convert an iptun_addr_t to sockaddr_storage. */ static void iptun_getaddr(iptun_addr_t *iptun_addr, struct sockaddr_storage *ss) { struct sockaddr_in *sin; struct sockaddr_in6 *sin6; bzero(ss, sizeof (*ss)); switch (iptun_addr->ia_family) { case AF_INET: sin = (struct sockaddr_in *)ss; sin->sin_addr.s_addr = iptun_addr->ia_addr.iau_addr4; break; case AF_INET6: sin6 = (struct sockaddr_in6 *)ss; sin6->sin6_addr = iptun_addr->ia_addr.iau_addr6; break; default: ASSERT(0); } ss->ss_family = iptun_addr->ia_family; } /* * General purpose function to set an IP tunnel source or destination address. */ static int iptun_setaddr(iptun_type_t iptun_type, iptun_addr_t *iptun_addr, const struct sockaddr_storage *ss) { if (!IPTUN_ADDR_MATCH(iptun_type, ss->ss_family)) return (EINVAL); switch (ss->ss_family) { case AF_INET: { struct sockaddr_in *sin = (struct sockaddr_in *)ss; if ((sin->sin_addr.s_addr == INADDR_ANY) || (sin->sin_addr.s_addr == INADDR_BROADCAST) || CLASSD(sin->sin_addr.s_addr)) { return (EADDRNOTAVAIL); } iptun_addr->ia_addr.iau_addr4 = sin->sin_addr.s_addr; break; } case AF_INET6: { struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)ss; if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) || IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr) || IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) { return (EADDRNOTAVAIL); } iptun_addr->ia_addr.iau_addr6 = sin6->sin6_addr; break; } default: return (EAFNOSUPPORT); } iptun_addr->ia_family = ss->ss_family; return (0); } static int iptun_setladdr(iptun_t *iptun, const struct sockaddr_storage *laddr) { return (iptun_setaddr(iptun->iptun_typeinfo->iti_type, &iptun->iptun_laddr, laddr)); } static int iptun_setraddr(iptun_t *iptun, const struct sockaddr_storage *raddr) { if (!(iptun->iptun_typeinfo->iti_hasraddr)) return (EINVAL); return (iptun_setaddr(iptun->iptun_typeinfo->iti_type, &iptun->iptun_raddr, raddr)); } static boolean_t iptun_canbind(iptun_t *iptun) { /* * A tunnel may bind when its source address has been set, and if its * tunnel type requires one, also its destination address. */ return ((iptun->iptun_flags & IPTUN_LADDR) && ((iptun->iptun_flags & IPTUN_RADDR) || !(iptun->iptun_typeinfo->iti_hasraddr))); } /* * Verify that the local address is valid, and insert in the fanout */ static int iptun_bind(iptun_t *iptun) { conn_t *connp = iptun->iptun_connp; int error = 0; ip_xmit_attr_t *ixa; iulp_t uinfo; ip_stack_t *ipst = connp->conn_netstack->netstack_ip; /* Get an exclusive ixa for this thread, and replace conn_ixa */ ixa = conn_get_ixa(connp, B_TRUE); if (ixa == NULL) return (ENOMEM); ASSERT(ixa->ixa_refcnt >= 2); ASSERT(ixa == connp->conn_ixa); /* We create PMTU state including for 6to4 */ ixa->ixa_flags |= IXAF_PMTU_DISCOVERY; ASSERT(iptun_canbind(iptun)); mutex_enter(&connp->conn_lock); /* * Note that conn_proto can't be set since the upper protocol * can be both 41 and 4 when IPv6 and IPv4 are over the same tunnel. * ipcl_iptun_classify doesn't use conn_proto. */ connp->conn_ipversion = iptun->iptun_typeinfo->iti_ipvers; switch (iptun->iptun_typeinfo->iti_type) { case IPTUN_TYPE_IPV4: IN6_IPADDR_TO_V4MAPPED(iptun->iptun_laddr4, &connp->conn_laddr_v6); IN6_IPADDR_TO_V4MAPPED(iptun->iptun_raddr4, &connp->conn_faddr_v6); ixa->ixa_flags |= IXAF_IS_IPV4; if (ip_laddr_verify_v4(iptun->iptun_laddr4, IPCL_ZONEID(connp), ipst, B_FALSE) != IPVL_UNICAST_UP) { mutex_exit(&connp->conn_lock); error = EADDRNOTAVAIL; goto done; } break; case IPTUN_TYPE_IPV6: connp->conn_laddr_v6 = iptun->iptun_laddr6; connp->conn_faddr_v6 = iptun->iptun_raddr6; ixa->ixa_flags &= ~IXAF_IS_IPV4; /* We use a zero scopeid for now */ if (ip_laddr_verify_v6(&iptun->iptun_laddr6, IPCL_ZONEID(connp), ipst, B_FALSE, 0) != IPVL_UNICAST_UP) { mutex_exit(&connp->conn_lock); error = EADDRNOTAVAIL; goto done; } break; case IPTUN_TYPE_6TO4: IN6_IPADDR_TO_V4MAPPED(iptun->iptun_laddr4, &connp->conn_laddr_v6); IN6_IPADDR_TO_V4MAPPED(INADDR_ANY, &connp->conn_faddr_v6); ixa->ixa_flags |= IXAF_IS_IPV4; mutex_exit(&connp->conn_lock); switch (ip_laddr_verify_v4(iptun->iptun_laddr4, IPCL_ZONEID(connp), ipst, B_FALSE)) { case IPVL_UNICAST_UP: case IPVL_UNICAST_DOWN: break; default: error = EADDRNOTAVAIL; goto done; } goto insert; } /* In case previous destination was multirt */ ip_attr_newdst(ixa); /* * When we set a tunnel's destination address, we do not * care if the destination is reachable. Transient routing * issues should not inhibit the creation of a tunnel * interface, for example. Thus we pass B_FALSE here. */ connp->conn_saddr_v6 = connp->conn_laddr_v6; mutex_exit(&connp->conn_lock); /* As long as the MTU is large we avoid fragmentation */ ixa->ixa_flags |= IXAF_DONTFRAG | IXAF_PMTU_IPV4_DF; /* We handle IPsec in iptun_output_common */ error = ip_attr_connect(connp, ixa, &connp->conn_saddr_v6, &connp->conn_faddr_v6, &connp->conn_faddr_v6, 0, &connp->conn_saddr_v6, &uinfo, 0); if (error != 0) goto done; /* saddr shouldn't change since it was already set */ ASSERT(IN6_ARE_ADDR_EQUAL(&connp->conn_laddr_v6, &connp->conn_saddr_v6)); /* We set IXAF_VERIFY_PMTU to catch PMTU increases */ ixa->ixa_flags |= IXAF_VERIFY_PMTU; ASSERT(uinfo.iulp_mtu != 0); /* * Allow setting new policies. * The addresses/ports are already set, thus the IPsec policy calls * can handle their passed-in conn's. */ connp->conn_policy_cached = B_FALSE; insert: error = ipcl_conn_insert(connp); if (error != 0) goto done; /* Record this as the "last" send even though we haven't sent any */ connp->conn_v6lastdst = connp->conn_faddr_v6; iptun->iptun_flags |= IPTUN_BOUND; /* * Now that we're bound with ip below us, this is a good * time to initialize the destination path MTU and to * re-calculate the tunnel's link MTU. */ (void) iptun_update_mtu(iptun, ixa, 0); if (IS_IPTUN_RUNNING(iptun)) iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE); done: ixa_refrele(ixa); return (error); } static void iptun_unbind(iptun_t *iptun) { ASSERT(iptun->iptun_flags & IPTUN_BOUND); ASSERT(mutex_owned(&iptun->iptun_lock) || (iptun->iptun_flags & IPTUN_CONDEMNED)); ip_unbind(iptun->iptun_connp); iptun->iptun_flags &= ~IPTUN_BOUND; if (!(iptun->iptun_flags & IPTUN_CONDEMNED)) iptun_task_dispatch(iptun, IPTUN_TASK_LINK_UPDATE); } /* * Re-generate the template data-link header for a given IP tunnel given the * tunnel's current parameters. */ static void iptun_headergen(iptun_t *iptun, boolean_t update_mac) { switch (iptun->iptun_typeinfo->iti_ipvers) { case IPV4_VERSION: /* * We only need to use a custom IP header if the administrator * has supplied a non-default hoplimit. */ if (iptun->iptun_hoplimit == IPTUN_DEFAULT_HOPLIMIT) { iptun->iptun_header_size = 0; break; } iptun->iptun_header_size = sizeof (ipha_t); iptun->iptun_header4.ipha_version_and_hdr_length = IP_SIMPLE_HDR_VERSION; iptun->iptun_header4.ipha_fragment_offset_and_flags = htons(IPH_DF); iptun->iptun_header4.ipha_ttl = iptun->iptun_hoplimit; break; case IPV6_VERSION: { ip6_t *ip6hp = &iptun->iptun_header6.it6h_ip6h; /* * We only need to use a custom IPv6 header if either the * administrator has supplied a non-default hoplimit, or we * need to include an encapsulation limit option in the outer * header. */ if (iptun->iptun_hoplimit == IPTUN_DEFAULT_HOPLIMIT && iptun->iptun_encaplimit == 0) { iptun->iptun_header_size = 0; break; } (void) memset(ip6hp, 0, sizeof (*ip6hp)); if (iptun->iptun_encaplimit == 0) { iptun->iptun_header_size = sizeof (ip6_t); ip6hp->ip6_nxt = IPPROTO_NONE; } else { iptun_encaplim_t *iel; iptun->iptun_header_size = sizeof (iptun_ipv6hdrs_t); /* * The mac_ipv6 plugin requires ip6_plen to be in host * byte order and reflect the extension headers * present in the template. The actual network byte * order ip6_plen will be set on a per-packet basis on * transmit. */ ip6hp->ip6_plen = sizeof (*iel); ip6hp->ip6_nxt = IPPROTO_DSTOPTS; iel = &iptun->iptun_header6.it6h_encaplim; *iel = iptun_encaplim_init; iel->iel_telopt.ip6ot_encap_limit = iptun->iptun_encaplimit; } ip6hp->ip6_hlim = iptun->iptun_hoplimit; break; } } if (update_mac) iptun_task_dispatch(iptun, IPTUN_TASK_PDATA_UPDATE); } /* * Insert inbound and outbound IPv4 and IPv6 policy into the given policy * head. */ static boolean_t iptun_insert_simple_policies(ipsec_policy_head_t *ph, ipsec_act_t *actp, uint_t n, netstack_t *ns) { int f = IPSEC_AF_V4; if (!ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_INBOUND, ns) || !ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_OUTBOUND, ns)) return (B_FALSE); f = IPSEC_AF_V6; return (ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_INBOUND, ns) && ipsec_polhead_insert(ph, actp, n, f, IPSEC_TYPE_OUTBOUND, ns)); } /* * Used to set IPsec policy when policy is set through the IPTUN_CREATE or * IPTUN_MODIFY ioctls. */ static int iptun_set_sec_simple(iptun_t *iptun, const ipsec_req_t *ipsr) { int rc = 0; uint_t nact; ipsec_act_t *actp = NULL; boolean_t clear_all, old_policy = B_FALSE; ipsec_tun_pol_t *itp; char name[MAXLINKNAMELEN]; uint64_t gen; netstack_t *ns = iptun->iptun_ns; /* Can't specify self-encap on a tunnel. */ if (ipsr->ipsr_self_encap_req != 0) return (EINVAL); /* * If it's a "clear-all" entry, unset the security flags and resume * normal cleartext (or inherit-from-global) policy. */ clear_all = ((ipsr->ipsr_ah_req & IPTUN_IPSEC_REQ_MASK) == 0 && (ipsr->ipsr_esp_req & IPTUN_IPSEC_REQ_MASK) == 0); ASSERT(mutex_owned(&iptun->iptun_lock)); itp = iptun->iptun_itp; if (itp == NULL) { if (clear_all) goto bail; if ((rc = dls_mgmt_get_linkinfo(iptun->iptun_linkid, name, NULL, NULL, NULL)) != 0) goto bail; ASSERT(name[0] != '\0'); if ((itp = create_tunnel_policy(name, &rc, &gen, ns)) == NULL) goto bail; iptun->iptun_itp = itp; } /* Allocate the actvec now, before holding itp or polhead locks. */ ipsec_actvec_from_req(ipsr, &actp, &nact, ns); if (actp == NULL) { rc = ENOMEM; goto bail; } /* * Just write on the active polhead. Save the primary/secondary stuff * for spdsock operations. * * Mutex because we need to write to the polhead AND flags atomically. * Other threads will acquire the polhead lock as a reader if the * (unprotected) flag is set. */ mutex_enter(&itp->itp_lock); if (itp->itp_flags & ITPF_P_TUNNEL) { /* Oops, we lost a race. Let's get out of here. */ rc = EBUSY; goto mutex_bail; } old_policy = ((itp->itp_flags & ITPF_P_ACTIVE) != 0); if (old_policy) { ITPF_CLONE(itp->itp_flags); rc = ipsec_copy_polhead(itp->itp_policy, itp->itp_inactive, ns); if (rc != 0) { /* inactive has already been cleared. */ itp->itp_flags &= ~ITPF_IFLAGS; goto mutex_bail; } rw_enter(&itp->itp_policy->iph_lock, RW_WRITER); ipsec_polhead_flush(itp->itp_policy, ns); } else { /* Else assume itp->itp_policy is already flushed. */ rw_enter(&itp->itp_policy->iph_lock, RW_WRITER); } if (clear_all) { ASSERT(avl_numnodes(&itp->itp_policy->iph_rulebyid) == 0); itp->itp_flags &= ~ITPF_PFLAGS; rw_exit(&itp->itp_policy->iph_lock); old_policy = B_FALSE; /* Clear out the inactive one too. */ goto recover_bail; } if (iptun_insert_simple_policies(itp->itp_policy, actp, nact, ns)) { rw_exit(&itp->itp_policy->iph_lock); /* * Adjust MTU and make sure the DL side knows what's up. */ itp->itp_flags = ITPF_P_ACTIVE; (void) iptun_update_mtu(iptun, NULL, 0); old_policy = B_FALSE; /* Blank out inactive - we succeeded */ } else { rw_exit(&itp->itp_policy->iph_lock); rc = ENOMEM; } recover_bail: if (old_policy) { /* Recover policy in in active polhead. */ ipsec_swap_policy(itp->itp_policy, itp->itp_inactive, ns); ITPF_SWAP(itp->itp_flags); } /* Clear policy in inactive polhead. */ itp->itp_flags &= ~ITPF_IFLAGS; rw_enter(&itp->itp_inactive->iph_lock, RW_WRITER); ipsec_polhead_flush(itp->itp_inactive, ns); rw_exit(&itp->itp_inactive->iph_lock); mutex_bail: mutex_exit(&itp->itp_lock); bail: if (actp != NULL) ipsec_actvec_free(actp, nact); return (rc); } static iptun_typeinfo_t * iptun_gettypeinfo(iptun_type_t type) { int i; for (i = 0; iptun_type_table[i].iti_type != IPTUN_TYPE_UNKNOWN; i++) { if (iptun_type_table[i].iti_type == type) break; } return (&iptun_type_table[i]); } /* * Set the parameters included in ik on the tunnel iptun. Parameters that can * only be set at creation time are set in iptun_create(). */ static int iptun_setparams(iptun_t *iptun, const iptun_kparams_t *ik) { int err = 0; netstack_t *ns = iptun->iptun_ns; iptun_addr_t orig_laddr, orig_raddr; uint_t orig_flags = iptun->iptun_flags; if (ik->iptun_kparam_flags & IPTUN_KPARAM_LADDR) { if (orig_flags & IPTUN_LADDR) orig_laddr = iptun->iptun_laddr; if ((err = iptun_setladdr(iptun, &ik->iptun_kparam_laddr)) != 0) return (err); iptun->iptun_flags |= IPTUN_LADDR; } if (ik->iptun_kparam_flags & IPTUN_KPARAM_RADDR) { if (orig_flags & IPTUN_RADDR) orig_raddr = iptun->iptun_raddr; if ((err = iptun_setraddr(iptun, &ik->iptun_kparam_raddr)) != 0) goto done; iptun->iptun_flags |= IPTUN_RADDR; } if (ik->iptun_kparam_flags & IPTUN_KPARAM_SECINFO) { /* * Set IPsec policy originating from the ifconfig(1M) command * line. This is traditionally called "simple" policy because * the ipsec_req_t (iptun_kparam_secinfo) can only describe a * simple policy of "do ESP on everything" and/or "do AH on * everything" (as opposed to the rich policy that can be * defined with ipsecconf(1M)). */ if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_6TO4) { /* * Can't set security properties for automatic * tunnels. */ err = EINVAL; goto done; } if (!ipsec_loaded(ns->netstack_ipsec)) { /* If IPsec can be loaded, try and load it now. */ if (ipsec_failed(ns->netstack_ipsec)) { err = EPROTONOSUPPORT; goto done; } ipsec_loader_loadnow(ns->netstack_ipsec); /* * ipsec_loader_loadnow() returns while IPsec is * loaded asynchronously. While a method exists to * wait for IPsec to load (ipsec_loader_wait()), it * requires use of a STREAMS queue to do a qwait(). * We're not in STREAMS context here, and so we can't * use it. This is not a problem in practice because * in the vast majority of cases, key management and * global policy will have loaded before any tunnels * are plumbed, and so IPsec will already have been * loaded. */ err = EAGAIN; goto done; } err = iptun_set_sec_simple(iptun, &ik->iptun_kparam_secinfo); if (err == 0) { iptun->iptun_flags |= IPTUN_SIMPLE_POLICY; iptun->iptun_simple_policy = ik->iptun_kparam_secinfo; } } done: if (err != 0) { /* Restore original source and destination. */ if (ik->iptun_kparam_flags & IPTUN_KPARAM_LADDR && (orig_flags & IPTUN_LADDR)) iptun->iptun_laddr = orig_laddr; if ((ik->iptun_kparam_flags & IPTUN_KPARAM_RADDR) && (orig_flags & IPTUN_RADDR)) iptun->iptun_raddr = orig_raddr; iptun->iptun_flags = orig_flags; } return (err); } static int iptun_register(iptun_t *iptun) { mac_register_t *mac; int err; ASSERT(!(iptun->iptun_flags & IPTUN_MAC_REGISTERED)); if ((mac = mac_alloc(MAC_VERSION)) == NULL) return (EINVAL); mac->m_type_ident = iptun->iptun_typeinfo->iti_ident; mac->m_driver = iptun; mac->m_dip = iptun_dip; mac->m_instance = (uint_t)-1; mac->m_src_addr = (uint8_t *)&iptun->iptun_laddr.ia_addr; mac->m_dst_addr = iptun->iptun_typeinfo->iti_hasraddr ? (uint8_t *)&iptun->iptun_raddr.ia_addr : NULL; mac->m_callbacks = &iptun_m_callbacks; mac->m_min_sdu = iptun->iptun_typeinfo->iti_minmtu; mac->m_max_sdu = iptun->iptun_mtu; if (iptun->iptun_header_size != 0) { mac->m_pdata = &iptun->iptun_header; mac->m_pdata_size = iptun->iptun_header_size; } if ((err = mac_register(mac, &iptun->iptun_mh)) == 0) iptun->iptun_flags |= IPTUN_MAC_REGISTERED; mac_free(mac); return (err); } static int iptun_unregister(iptun_t *iptun) { int err; ASSERT(iptun->iptun_flags & IPTUN_MAC_REGISTERED); if ((err = mac_unregister(iptun->iptun_mh)) == 0) iptun->iptun_flags &= ~IPTUN_MAC_REGISTERED; return (err); } static conn_t * iptun_conn_create(iptun_t *iptun, netstack_t *ns, cred_t *credp) { conn_t *connp; if ((connp = ipcl_conn_create(IPCL_IPCCONN, KM_NOSLEEP, ns)) == NULL) return (NULL); connp->conn_flags |= IPCL_IPTUN; connp->conn_iptun = iptun; connp->conn_recv = iptun_input; connp->conn_recvicmp = iptun_input_icmp; connp->conn_verifyicmp = iptun_verifyicmp; /* * Register iptun_notify to listen to capability changes detected by IP. * This upcall is made in the context of the call to conn_ip_output. */ connp->conn_ixa->ixa_notify = iptun_notify; connp->conn_ixa->ixa_notify_cookie = iptun; /* * For exclusive stacks we set conn_zoneid to GLOBAL_ZONEID as is done * for all other conn_t's. * * Note that there's an important distinction between iptun_zoneid and * conn_zoneid. The conn_zoneid is set to GLOBAL_ZONEID in non-global * exclusive stack zones to make the ip module believe that the * non-global zone is actually a global zone. Therefore, when * interacting with the ip module, we must always use conn_zoneid. */ connp->conn_zoneid = (ns->netstack_stackid == GLOBAL_NETSTACKID) ? crgetzoneid(credp) : GLOBAL_ZONEID; connp->conn_cred = credp; /* crfree() is done in ipcl_conn_destroy(), called by CONN_DEC_REF() */ crhold(connp->conn_cred); connp->conn_cpid = NOPID; /* conn_allzones can not be set this early, hence no IPCL_ZONEID */ connp->conn_ixa->ixa_zoneid = connp->conn_zoneid; ASSERT(connp->conn_ref == 1); /* Cache things in ixa without an extra refhold */ ASSERT(!(connp->conn_ixa->ixa_free_flags & IXA_FREE_CRED)); connp->conn_ixa->ixa_cred = connp->conn_cred; connp->conn_ixa->ixa_cpid = connp->conn_cpid; if (is_system_labeled()) connp->conn_ixa->ixa_tsl = crgetlabel(connp->conn_cred); /* * Have conn_ip_output drop packets should our outer source * go invalid */ connp->conn_ixa->ixa_flags |= IXAF_VERIFY_SOURCE; switch (iptun->iptun_typeinfo->iti_ipvers) { case IPV4_VERSION: connp->conn_family = AF_INET6; break; case IPV6_VERSION: connp->conn_family = AF_INET; break; } mutex_enter(&connp->conn_lock); connp->conn_state_flags &= ~CONN_INCIPIENT; mutex_exit(&connp->conn_lock); return (connp); } static void iptun_conn_destroy(conn_t *connp) { ip_quiesce_conn(connp); connp->conn_iptun = NULL; ASSERT(connp->conn_ref == 1); CONN_DEC_REF(connp); } static iptun_t * iptun_alloc(void) { iptun_t *iptun; if ((iptun = kmem_cache_alloc(iptun_cache, KM_NOSLEEP)) != NULL) { bzero(iptun, sizeof (*iptun)); atomic_inc_32(&iptun_tunnelcount); } return (iptun); } static void iptun_free(iptun_t *iptun) { ASSERT(iptun->iptun_flags & IPTUN_CONDEMNED); if (iptun->iptun_flags & IPTUN_HASH_INSERTED) { iptun_stack_t *iptuns = iptun->iptun_iptuns; mutex_enter(&iptun_hash_lock); VERIFY(mod_hash_remove(iptun_hash, IPTUN_HASH_KEY(iptun->iptun_linkid), (mod_hash_val_t *)&iptun) == 0); mutex_exit(&iptun_hash_lock); iptun->iptun_flags &= ~IPTUN_HASH_INSERTED; mutex_enter(&iptuns->iptuns_lock); list_remove(&iptuns->iptuns_iptunlist, iptun); mutex_exit(&iptuns->iptuns_lock); } if (iptun->iptun_flags & IPTUN_BOUND) iptun_unbind(iptun); /* * After iptun_unregister(), there will be no threads executing a * downcall from the mac module, including in the tx datapath. */ if (iptun->iptun_flags & IPTUN_MAC_REGISTERED) VERIFY(iptun_unregister(iptun) == 0); if (iptun->iptun_itp != NULL) { /* * Remove from the AVL tree, AND release the reference iptun_t * itself holds on the ITP. */ itp_unlink(iptun->iptun_itp, iptun->iptun_ns); ITP_REFRELE(iptun->iptun_itp, iptun->iptun_ns); iptun->iptun_itp = NULL; iptun->iptun_flags &= ~IPTUN_SIMPLE_POLICY; } /* * After ipcl_conn_destroy(), there will be no threads executing an * upcall from ip (i.e., iptun_input()), and it is then safe to free * the iptun_t. */ if (iptun->iptun_connp != NULL) { iptun_conn_destroy(iptun->iptun_connp); iptun->iptun_connp = NULL; } kmem_cache_free(iptun_cache, iptun); atomic_dec_32(&iptun_tunnelcount); } int iptun_create(iptun_kparams_t *ik, cred_t *credp) { iptun_t *iptun = NULL; int err = 0, mherr; char linkname[MAXLINKNAMELEN]; ipsec_tun_pol_t *itp; netstack_t *ns = NULL; iptun_stack_t *iptuns; datalink_id_t tmpid; zoneid_t zoneid = crgetzoneid(credp); boolean_t link_created = B_FALSE; /* The tunnel type is mandatory */ if (!(ik->iptun_kparam_flags & IPTUN_KPARAM_TYPE)) return (EINVAL); /* * Is the linkid that the caller wishes to associate with this new * tunnel assigned to this zone? */ if (zone_check_datalink(&zoneid, ik->iptun_kparam_linkid) != 0) { if (zoneid != GLOBAL_ZONEID) return (EINVAL); } else if (zoneid == GLOBAL_ZONEID) { return (EINVAL); } /* * Make sure that we're not trying to create a tunnel that has already * been created. */ if (iptun_enter_by_linkid(ik->iptun_kparam_linkid, &iptun) == 0) { iptun_exit(iptun); iptun = NULL; err = EEXIST; goto done; } ns = netstack_find_by_cred(credp); iptuns = ns->netstack_iptun; if ((iptun = iptun_alloc()) == NULL) { err = ENOMEM; goto done; } iptun->iptun_linkid = ik->iptun_kparam_linkid; iptun->iptun_zoneid = zoneid; iptun->iptun_ns = ns; iptun->iptun_typeinfo = iptun_gettypeinfo(ik->iptun_kparam_type); if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_UNKNOWN) { err = EINVAL; goto done; } if (ik->iptun_kparam_flags & IPTUN_KPARAM_IMPLICIT) iptun->iptun_flags |= IPTUN_IMPLICIT; if ((err = iptun_setparams(iptun, ik)) != 0) goto done; iptun->iptun_hoplimit = IPTUN_DEFAULT_HOPLIMIT; if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_IPV6) iptun->iptun_encaplimit = IPTUN_DEFAULT_ENCAPLIMIT; iptun_headergen(iptun, B_FALSE); iptun->iptun_connp = iptun_conn_create(iptun, ns, credp); if (iptun->iptun_connp == NULL) { err = ENOMEM; goto done; } iptun->iptun_mtu = iptun->iptun_typeinfo->iti_maxmtu; iptun->iptun_dpmtu = iptun->iptun_mtu; /* * Find an ITP based on linkname. If we have parms already set via * the iptun_setparams() call above, it may have created an ITP for * us. We always try get_tunnel_policy() for DEBUG correctness * checks, and we may wish to refactor this to only check when * iptun_itp is NULL. */ if ((err = dls_mgmt_get_linkinfo(iptun->iptun_linkid, linkname, NULL, NULL, NULL)) != 0) goto done; if ((itp = get_tunnel_policy(linkname, ns)) != NULL) iptun->iptun_itp = itp; /* * See if we have the necessary IP addresses assigned to this tunnel * to try and bind them with ip underneath us. If we're not ready to * bind yet, then we'll defer the bind operation until the addresses * are modified. */ if (iptun_canbind(iptun) && ((err = iptun_bind(iptun)) != 0)) goto done; if ((err = iptun_register(iptun)) != 0) goto done; err = dls_devnet_create(iptun->iptun_mh, iptun->iptun_linkid, iptun->iptun_zoneid); if (err != 0) goto done; link_created = B_TRUE; /* * We hash by link-id as that is the key used by all other iptun * interfaces (modify, delete, etc.). */ if ((mherr = mod_hash_insert(iptun_hash, IPTUN_HASH_KEY(iptun->iptun_linkid), (mod_hash_val_t)iptun)) == 0) { mutex_enter(&iptuns->iptuns_lock); list_insert_head(&iptuns->iptuns_iptunlist, iptun); mutex_exit(&iptuns->iptuns_lock); iptun->iptun_flags |= IPTUN_HASH_INSERTED; } else if (mherr == MH_ERR_NOMEM) { err = ENOMEM; } else if (mherr == MH_ERR_DUPLICATE) { err = EEXIST; } else { err = EINVAL; } done: if (iptun == NULL && ns != NULL) netstack_rele(ns); if (err != 0 && iptun != NULL) { if (link_created) { (void) dls_devnet_destroy(iptun->iptun_mh, &tmpid, B_TRUE); } iptun->iptun_flags |= IPTUN_CONDEMNED; iptun_free(iptun); } return (err); } int iptun_delete(datalink_id_t linkid, cred_t *credp) { int err; iptun_t *iptun = NULL; if ((err = iptun_enter_by_linkid(linkid, &iptun)) != 0) return (err); /* One cannot delete a tunnel that belongs to another zone. */ if (iptun->iptun_zoneid != crgetzoneid(credp)) { iptun_exit(iptun); return (EACCES); } /* * We need to exit iptun in order to issue calls up the stack such as * dls_devnet_destroy(). If we call up while still in iptun, deadlock * with calls coming down the stack is possible. We prevent other * threads from entering this iptun after we've exited it by setting * the IPTUN_DELETE_PENDING flag. This will cause callers of * iptun_enter() to block waiting on iptun_enter_cv. The assumption * here is that the functions we're calling while IPTUN_DELETE_PENDING * is set dont resuult in an iptun_enter() call, as that would result * in deadlock. */ iptun->iptun_flags |= IPTUN_DELETE_PENDING; /* Wait for any pending upcall to the mac module to complete. */ while (iptun->iptun_flags & IPTUN_UPCALL_PENDING) cv_wait(&iptun->iptun_upcall_cv, &iptun->iptun_lock); iptun_exit(iptun); if ((err = dls_devnet_destroy(iptun->iptun_mh, &linkid, B_TRUE)) == 0) { /* * mac_disable() will fail with EBUSY if there are references * to the iptun MAC. If there are none, then mac_disable() * will assure that none can be acquired until the MAC is * unregistered. * * XXX CR 6791335 prevents us from calling mac_disable() prior * to dls_devnet_destroy(), so we unfortunately need to * attempt to re-create the devnet node if mac_disable() * fails. */ if ((err = mac_disable(iptun->iptun_mh)) != 0) { (void) dls_devnet_create(iptun->iptun_mh, linkid, iptun->iptun_zoneid); } } /* * Now that we know the fate of this iptun_t, we need to clear * IPTUN_DELETE_PENDING, and set IPTUN_CONDEMNED if the iptun_t is * slated to be freed. Either way, we need to signal the threads * waiting in iptun_enter() so that they can either fail if * IPTUN_CONDEMNED is set, or continue if it's not. */ mutex_enter(&iptun->iptun_lock); iptun->iptun_flags &= ~IPTUN_DELETE_PENDING; if (err == 0) iptun->iptun_flags |= IPTUN_CONDEMNED; cv_broadcast(&iptun->iptun_enter_cv); mutex_exit(&iptun->iptun_lock); /* * Note that there is no danger in calling iptun_free() after having * dropped the iptun_lock since callers of iptun_enter() at this point * are doing so from iptun_enter_by_linkid() (mac_disable() got rid of * threads entering from mac callbacks which call iptun_enter() * directly) which holds iptun_hash_lock, and iptun_free() grabs this * lock in order to remove the iptun_t from the hash table. */ if (err == 0) iptun_free(iptun); return (err); } int iptun_modify(const iptun_kparams_t *ik, cred_t *credp) { iptun_t *iptun; boolean_t laddr_change = B_FALSE, raddr_change = B_FALSE; int err; if ((err = iptun_enter_by_linkid(ik->iptun_kparam_linkid, &iptun)) != 0) return (err); /* One cannot modify a tunnel that belongs to another zone. */ if (iptun->iptun_zoneid != crgetzoneid(credp)) { err = EACCES; goto done; } /* The tunnel type cannot be changed */ if (ik->iptun_kparam_flags & IPTUN_KPARAM_TYPE) { err = EINVAL; goto done; } if ((err = iptun_setparams(iptun, ik)) != 0) goto done; iptun_headergen(iptun, B_FALSE); /* * If any of the tunnel's addresses has been modified and the tunnel * has the necessary addresses assigned to it, we need to try to bind * with ip underneath us. If we're not ready to bind yet, then we'll * try again when the addresses are modified later. */ laddr_change = (ik->iptun_kparam_flags & IPTUN_KPARAM_LADDR); raddr_change = (ik->iptun_kparam_flags & IPTUN_KPARAM_RADDR); if (laddr_change || raddr_change) { if (iptun->iptun_flags & IPTUN_BOUND) iptun_unbind(iptun); if (iptun_canbind(iptun) && (err = iptun_bind(iptun)) != 0) { if (laddr_change) iptun->iptun_flags &= ~IPTUN_LADDR; if (raddr_change) iptun->iptun_flags &= ~IPTUN_RADDR; goto done; } } if (laddr_change) iptun_task_dispatch(iptun, IPTUN_TASK_LADDR_UPDATE); if (raddr_change) iptun_task_dispatch(iptun, IPTUN_TASK_RADDR_UPDATE); done: iptun_exit(iptun); return (err); } /* Given an IP tunnel's datalink id, fill in its parameters. */ int iptun_info(iptun_kparams_t *ik, cred_t *credp) { iptun_t *iptun; int err; /* Is the tunnel link visible from the caller's zone? */ if (!dls_devnet_islinkvisible(ik->iptun_kparam_linkid, crgetzoneid(credp))) return (ENOENT); if ((err = iptun_enter_by_linkid(ik->iptun_kparam_linkid, &iptun)) != 0) return (err); bzero(ik, sizeof (iptun_kparams_t)); ik->iptun_kparam_linkid = iptun->iptun_linkid; ik->iptun_kparam_type = iptun->iptun_typeinfo->iti_type; ik->iptun_kparam_flags |= IPTUN_KPARAM_TYPE; if (iptun->iptun_flags & IPTUN_LADDR) { iptun_getaddr(&iptun->iptun_laddr, &ik->iptun_kparam_laddr); ik->iptun_kparam_flags |= IPTUN_KPARAM_LADDR; } if (iptun->iptun_flags & IPTUN_RADDR) { iptun_getaddr(&iptun->iptun_raddr, &ik->iptun_kparam_raddr); ik->iptun_kparam_flags |= IPTUN_KPARAM_RADDR; } if (iptun->iptun_flags & IPTUN_IMPLICIT) ik->iptun_kparam_flags |= IPTUN_KPARAM_IMPLICIT; if (iptun->iptun_itp != NULL) { mutex_enter(&iptun->iptun_itp->itp_lock); if (iptun->iptun_itp->itp_flags & ITPF_P_ACTIVE) { ik->iptun_kparam_flags |= IPTUN_KPARAM_IPSECPOL; if (iptun->iptun_flags & IPTUN_SIMPLE_POLICY) { ik->iptun_kparam_flags |= IPTUN_KPARAM_SECINFO; ik->iptun_kparam_secinfo = iptun->iptun_simple_policy; } } mutex_exit(&iptun->iptun_itp->itp_lock); } done: iptun_exit(iptun); return (err); } int iptun_set_6to4relay(netstack_t *ns, ipaddr_t relay_addr) { if (relay_addr == INADDR_BROADCAST || CLASSD(relay_addr)) return (EADDRNOTAVAIL); ns->netstack_iptun->iptuns_relay_rtr_addr = relay_addr; return (0); } void iptun_get_6to4relay(netstack_t *ns, ipaddr_t *relay_addr) { *relay_addr = ns->netstack_iptun->iptuns_relay_rtr_addr; } void iptun_set_policy(datalink_id_t linkid, ipsec_tun_pol_t *itp) { iptun_t *iptun; if (iptun_enter_by_linkid(linkid, &iptun) != 0) return; if (iptun->iptun_itp != itp) { ASSERT(iptun->iptun_itp == NULL); ITP_REFHOLD(itp); iptun->iptun_itp = itp; } /* * IPsec policy means IPsec overhead, which means lower MTU. * Refresh the MTU for this tunnel. */ (void) iptun_update_mtu(iptun, NULL, 0); iptun_exit(iptun); } /* * Obtain the path MTU to the tunnel destination. * Can return zero in some cases. */ static uint32_t iptun_get_dst_pmtu(iptun_t *iptun, ip_xmit_attr_t *ixa) { uint32_t pmtu = 0; conn_t *connp = iptun->iptun_connp; boolean_t need_rele = B_FALSE; /* * We only obtain the pmtu for tunnels that have a remote tunnel * address. */ if (!(iptun->iptun_flags & IPTUN_RADDR)) return (0); if (ixa == NULL) { ixa = conn_get_ixa(connp, B_FALSE); if (ixa == NULL) return (0); need_rele = B_TRUE; } /* * Guard against ICMP errors before we have sent, as well as against * and a thread which held conn_ixa. */ if (ixa->ixa_ire != NULL) { pmtu = ip_get_pmtu(ixa); /* * For both IPv4 and IPv6 we can have indication that the outer * header needs fragmentation. */ if (ixa->ixa_flags & IXAF_PMTU_TOO_SMALL) { /* Must allow fragmentation in ip_output */ ixa->ixa_flags &= ~IXAF_DONTFRAG; } else if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_6TO4) { ixa->ixa_flags |= IXAF_DONTFRAG; } else { /* ip_get_pmtu might have set this - we don't want it */ ixa->ixa_flags &= ~IXAF_PMTU_IPV4_DF; } } if (need_rele) ixa_refrele(ixa); return (pmtu); } /* * Update the ip_xmit_attr_t to capture the current lower path mtu as known * by ip. */ static void iptun_update_dst_pmtu(iptun_t *iptun, ip_xmit_attr_t *ixa) { uint32_t pmtu; conn_t *connp = iptun->iptun_connp; boolean_t need_rele = B_FALSE; /* IXAF_VERIFY_PMTU is not set if we don't have a fixed destination */ if (!(iptun->iptun_flags & IPTUN_RADDR)) return; if (ixa == NULL) { ixa = conn_get_ixa(connp, B_FALSE); if (ixa == NULL) return; need_rele = B_TRUE; } /* * Guard against ICMP errors before we have sent, as well as against * and a thread which held conn_ixa. */ if (ixa->ixa_ire != NULL) { pmtu = ip_get_pmtu(ixa); /* * Update ixa_fragsize and ixa_pmtu. */ ixa->ixa_fragsize = ixa->ixa_pmtu = pmtu; /* * For both IPv4 and IPv6 we can have indication that the outer * header needs fragmentation. */ if (ixa->ixa_flags & IXAF_PMTU_TOO_SMALL) { /* Must allow fragmentation in ip_output */ ixa->ixa_flags &= ~IXAF_DONTFRAG; } else if (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_6TO4) { ixa->ixa_flags |= IXAF_DONTFRAG; } else { /* ip_get_pmtu might have set this - we don't want it */ ixa->ixa_flags &= ~IXAF_PMTU_IPV4_DF; } } if (need_rele) ixa_refrele(ixa); } /* * There is nothing that iptun can verify in addition to IP having * verified the IP addresses in the fanout. */ /* ARGSUSED */ static boolean_t iptun_verifyicmp(conn_t *connp, void *arg2, icmph_t *icmph, icmp6_t *icmp6, ip_recv_attr_t *ira) { return (B_TRUE); } /* * Notify function registered with ip_xmit_attr_t. */ static void iptun_notify(void *arg, ip_xmit_attr_t *ixa, ixa_notify_type_t ntype, ixa_notify_arg_t narg) { iptun_t *iptun = (iptun_t *)arg; switch (ntype) { case IXAN_PMTU: (void) iptun_update_mtu(iptun, ixa, narg); break; } } /* * Returns the max of old_ovhd and the overhead associated with pol. */ static uint32_t iptun_max_policy_overhead(ipsec_policy_t *pol, uint32_t old_ovhd) { uint32_t new_ovhd = old_ovhd; while (pol != NULL) { new_ovhd = max(new_ovhd, ipsec_act_ovhd(&pol->ipsp_act->ipa_act)); pol = pol->ipsp_hash.hash_next; } return (new_ovhd); } static uint32_t iptun_get_ipsec_overhead(iptun_t *iptun) { ipsec_policy_root_t *ipr; ipsec_policy_head_t *iph; ipsec_policy_t *pol; ipsec_selector_t sel; int i; uint32_t ipsec_ovhd = 0; ipsec_tun_pol_t *itp = iptun->iptun_itp; netstack_t *ns = iptun->iptun_ns; if (itp == NULL || !(itp->itp_flags & ITPF_P_ACTIVE)) { /* * Consult global policy, just in case. This will only work * if we have both source and destination addresses to work * with. */ if ((iptun->iptun_flags & (IPTUN_LADDR|IPTUN_RADDR)) != (IPTUN_LADDR|IPTUN_RADDR)) return (0); iph = ipsec_system_policy(ns); bzero(&sel, sizeof (sel)); sel.ips_isv4 = (iptun->iptun_typeinfo->iti_ipvers == IPV4_VERSION); switch (iptun->iptun_typeinfo->iti_ipvers) { case IPV4_VERSION: sel.ips_local_addr_v4 = iptun->iptun_laddr4; sel.ips_remote_addr_v4 = iptun->iptun_raddr4; break; case IPV6_VERSION: sel.ips_local_addr_v6 = iptun->iptun_laddr6; sel.ips_remote_addr_v6 = iptun->iptun_raddr6; break; } /* Check for both IPv4 and IPv6. */ sel.ips_protocol = IPPROTO_ENCAP; pol = ipsec_find_policy_head(NULL, iph, IPSEC_TYPE_OUTBOUND, &sel); if (pol != NULL) { ipsec_ovhd = ipsec_act_ovhd(&pol->ipsp_act->ipa_act); IPPOL_REFRELE(pol); } sel.ips_protocol = IPPROTO_IPV6; pol = ipsec_find_policy_head(NULL, iph, IPSEC_TYPE_OUTBOUND, &sel); if (pol != NULL) { ipsec_ovhd = max(ipsec_ovhd, ipsec_act_ovhd(&pol->ipsp_act->ipa_act)); IPPOL_REFRELE(pol); } IPPH_REFRELE(iph, ns); } else { /* * Look through all of the possible IPsec actions for the * tunnel, and find the largest potential IPsec overhead. */ iph = itp->itp_policy; rw_enter(&iph->iph_lock, RW_READER); ipr = &(iph->iph_root[IPSEC_TYPE_OUTBOUND]); ipsec_ovhd = iptun_max_policy_overhead( ipr->ipr_nonhash[IPSEC_AF_V4], 0); ipsec_ovhd = iptun_max_policy_overhead( ipr->ipr_nonhash[IPSEC_AF_V6], ipsec_ovhd); for (i = 0; i < ipr->ipr_nchains; i++) { ipsec_ovhd = iptun_max_policy_overhead( ipr->ipr_hash[i].hash_head, ipsec_ovhd); } rw_exit(&iph->iph_lock); } return (ipsec_ovhd); } /* * Calculate and return the maximum possible upper MTU for the given tunnel. * * If new_pmtu is set then we also need to update the lower path MTU information * in the ip_xmit_attr_t. That is needed since we set IXAF_VERIFY_PMTU so that * we are notified by conn_ip_output() when the path MTU increases. */ static uint32_t iptun_get_maxmtu(iptun_t *iptun, ip_xmit_attr_t *ixa, uint32_t new_pmtu) { size_t header_size, ipsec_overhead; uint32_t maxmtu, pmtu; /* * Start with the path-MTU to the remote address, which is either * provided as the new_pmtu argument, or obtained using * iptun_get_dst_pmtu(). */ if (new_pmtu != 0) { if (iptun->iptun_flags & IPTUN_RADDR) iptun->iptun_dpmtu = new_pmtu; pmtu = new_pmtu; } else if (iptun->iptun_flags & IPTUN_RADDR) { if ((pmtu = iptun_get_dst_pmtu(iptun, ixa)) == 0) { /* * We weren't able to obtain the path-MTU of the * destination. Use the previous value. */ pmtu = iptun->iptun_dpmtu; } else { iptun->iptun_dpmtu = pmtu; } } else { /* * We have no path-MTU information to go on, use the maximum * possible value. */ pmtu = iptun->iptun_typeinfo->iti_maxmtu; } /* * Now calculate tunneling overhead and subtract that from the * path-MTU information obtained above. */ if (iptun->iptun_header_size != 0) { header_size = iptun->iptun_header_size; } else { switch (iptun->iptun_typeinfo->iti_ipvers) { case IPV4_VERSION: header_size = sizeof (ipha_t); if (is_system_labeled()) header_size += IP_MAX_OPT_LENGTH; break; case IPV6_VERSION: header_size = sizeof (iptun_ipv6hdrs_t); break; } } ipsec_overhead = iptun_get_ipsec_overhead(iptun); maxmtu = pmtu - (header_size + ipsec_overhead); return (max(maxmtu, iptun->iptun_typeinfo->iti_minmtu)); } /* * Re-calculate the tunnel's MTU as seen from above and notify the MAC layer * of any change in MTU. The new_pmtu argument is the new lower path MTU to * the tunnel destination to be used in the tunnel MTU calculation. Passing * in 0 for new_pmtu causes the lower path MTU to be dynamically updated using * ip_get_pmtu(). * * If the calculated tunnel MTU is different than its previous value, then we * notify the MAC layer above us of this change using mac_maxsdu_update(). */ static uint32_t iptun_update_mtu(iptun_t *iptun, ip_xmit_attr_t *ixa, uint32_t new_pmtu) { uint32_t newmtu; /* We always update the ixa since we might have set IXAF_VERIFY_PMTU */ iptun_update_dst_pmtu(iptun, ixa); /* * We return the current MTU without updating it if it was pegged to a * static value using the MAC_PROP_MTU link property. */ if (iptun->iptun_flags & IPTUN_FIXED_MTU) return (iptun->iptun_mtu); /* If the MTU isn't fixed, then use the maximum possible value. */ newmtu = iptun_get_maxmtu(iptun, ixa, new_pmtu); /* * We only dynamically adjust the tunnel MTU for tunnels with * destinations because dynamic MTU calculations are based on the * destination path-MTU. */ if ((iptun->iptun_flags & IPTUN_RADDR) && newmtu != iptun->iptun_mtu) { iptun->iptun_mtu = newmtu; if (iptun->iptun_flags & IPTUN_MAC_REGISTERED) iptun_task_dispatch(iptun, IPTUN_TASK_MTU_UPDATE); } return (newmtu); } /* * Frees a packet or packet chain and bumps stat for each freed packet. */ static void iptun_drop_pkt(mblk_t *mp, uint64_t *stat) { mblk_t *pktmp; for (pktmp = mp; pktmp != NULL; pktmp = mp) { mp = mp->b_next; pktmp->b_next = NULL; if (stat != NULL) atomic_inc_64(stat); freemsg(pktmp); } } /* * Allocate and return a new mblk to hold an IP and ICMP header, and chain the * original packet to its b_cont. Returns NULL on failure. */ static mblk_t * iptun_build_icmperr(size_t hdrs_size, mblk_t *orig_pkt) { mblk_t *icmperr_mp; if ((icmperr_mp = allocb(hdrs_size, BPRI_MED)) != NULL) { icmperr_mp->b_wptr += hdrs_size; /* tack on the offending packet */ icmperr_mp->b_cont = orig_pkt; } return (icmperr_mp); } /* * Transmit an ICMP error. mp->b_rptr points at the packet to be included in * the ICMP error. */ static void iptun_sendicmp_v4(iptun_t *iptun, icmph_t *icmp, ipha_t *orig_ipha, mblk_t *mp, ts_label_t *tsl) { size_t orig_pktsize, hdrs_size; mblk_t *icmperr_mp; ipha_t *new_ipha; icmph_t *new_icmp; ip_xmit_attr_t ixas; conn_t *connp = iptun->iptun_connp; orig_pktsize = msgdsize(mp); hdrs_size = sizeof (ipha_t) + sizeof (icmph_t); if ((icmperr_mp = iptun_build_icmperr(hdrs_size, mp)) == NULL) { iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf); return; } new_ipha = (ipha_t *)icmperr_mp->b_rptr; new_icmp = (icmph_t *)(new_ipha + 1); new_ipha->ipha_version_and_hdr_length = IP_SIMPLE_HDR_VERSION; new_ipha->ipha_type_of_service = 0; new_ipha->ipha_ident = 0; new_ipha->ipha_fragment_offset_and_flags = 0; new_ipha->ipha_ttl = orig_ipha->ipha_ttl; new_ipha->ipha_protocol = IPPROTO_ICMP; new_ipha->ipha_src = orig_ipha->ipha_dst; new_ipha->ipha_dst = orig_ipha->ipha_src; new_ipha->ipha_hdr_checksum = 0; /* will be computed by ip */ new_ipha->ipha_length = htons(hdrs_size + orig_pktsize); *new_icmp = *icmp; new_icmp->icmph_checksum = 0; new_icmp->icmph_checksum = IP_CSUM(icmperr_mp, sizeof (ipha_t), 0); bzero(&ixas, sizeof (ixas)); ixas.ixa_flags = IXAF_BASIC_SIMPLE_V4; if (new_ipha->ipha_src == INADDR_ANY) { ixas.ixa_flags &= ~IXAF_VERIFY_SOURCE; ixas.ixa_flags |= IXAF_SET_SOURCE; } ixas.ixa_zoneid = IPCL_ZONEID(connp); ixas.ixa_ipst = connp->conn_netstack->netstack_ip; ixas.ixa_cred = connp->conn_cred; ixas.ixa_cpid = NOPID; if (is_system_labeled()) ixas.ixa_tsl = tsl; ixas.ixa_ifindex = 0; ixas.ixa_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; (void) ip_output_simple(icmperr_mp, &ixas); ixa_cleanup(&ixas); } static void iptun_sendicmp_v6(iptun_t *iptun, icmp6_t *icmp6, ip6_t *orig_ip6h, mblk_t *mp, ts_label_t *tsl) { size_t orig_pktsize, hdrs_size; mblk_t *icmp6err_mp; ip6_t *new_ip6h; icmp6_t *new_icmp6; ip_xmit_attr_t ixas; conn_t *connp = iptun->iptun_connp; orig_pktsize = msgdsize(mp); hdrs_size = sizeof (ip6_t) + sizeof (icmp6_t); if ((icmp6err_mp = iptun_build_icmperr(hdrs_size, mp)) == NULL) { iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf); return; } new_ip6h = (ip6_t *)icmp6err_mp->b_rptr; new_icmp6 = (icmp6_t *)(new_ip6h + 1); new_ip6h->ip6_vcf = orig_ip6h->ip6_vcf; new_ip6h->ip6_plen = htons(sizeof (icmp6_t) + orig_pktsize); new_ip6h->ip6_hops = orig_ip6h->ip6_hops; new_ip6h->ip6_nxt = IPPROTO_ICMPV6; new_ip6h->ip6_src = orig_ip6h->ip6_dst; new_ip6h->ip6_dst = orig_ip6h->ip6_src; *new_icmp6 = *icmp6; /* The checksum is calculated in ip_output_simple and friends. */ new_icmp6->icmp6_cksum = new_ip6h->ip6_plen; bzero(&ixas, sizeof (ixas)); ixas.ixa_flags = IXAF_BASIC_SIMPLE_V6; if (IN6_IS_ADDR_UNSPECIFIED(&new_ip6h->ip6_src)) { ixas.ixa_flags &= ~IXAF_VERIFY_SOURCE; ixas.ixa_flags |= IXAF_SET_SOURCE; } ixas.ixa_zoneid = IPCL_ZONEID(connp); ixas.ixa_ipst = connp->conn_netstack->netstack_ip; ixas.ixa_cred = connp->conn_cred; ixas.ixa_cpid = NOPID; if (is_system_labeled()) ixas.ixa_tsl = tsl; ixas.ixa_ifindex = 0; ixas.ixa_multicast_ttl = IP_DEFAULT_MULTICAST_TTL; (void) ip_output_simple(icmp6err_mp, &ixas); ixa_cleanup(&ixas); } static void iptun_icmp_error_v4(iptun_t *iptun, ipha_t *orig_ipha, mblk_t *mp, uint8_t type, uint8_t code, ts_label_t *tsl) { icmph_t icmp; bzero(&icmp, sizeof (icmp)); icmp.icmph_type = type; icmp.icmph_code = code; iptun_sendicmp_v4(iptun, &icmp, orig_ipha, mp, tsl); } static void iptun_icmp_fragneeded_v4(iptun_t *iptun, uint32_t newmtu, ipha_t *orig_ipha, mblk_t *mp, ts_label_t *tsl) { icmph_t icmp; icmp.icmph_type = ICMP_DEST_UNREACHABLE; icmp.icmph_code = ICMP_FRAGMENTATION_NEEDED; icmp.icmph_du_zero = 0; icmp.icmph_du_mtu = htons(newmtu); iptun_sendicmp_v4(iptun, &icmp, orig_ipha, mp, tsl); } static void iptun_icmp_error_v6(iptun_t *iptun, ip6_t *orig_ip6h, mblk_t *mp, uint8_t type, uint8_t code, uint32_t offset, ts_label_t *tsl) { icmp6_t icmp6; bzero(&icmp6, sizeof (icmp6)); icmp6.icmp6_type = type; icmp6.icmp6_code = code; if (type == ICMP6_PARAM_PROB) icmp6.icmp6_pptr = htonl(offset); iptun_sendicmp_v6(iptun, &icmp6, orig_ip6h, mp, tsl); } static void iptun_icmp_toobig_v6(iptun_t *iptun, uint32_t newmtu, ip6_t *orig_ip6h, mblk_t *mp, ts_label_t *tsl) { icmp6_t icmp6; icmp6.icmp6_type = ICMP6_PACKET_TOO_BIG; icmp6.icmp6_code = 0; icmp6.icmp6_mtu = htonl(newmtu); iptun_sendicmp_v6(iptun, &icmp6, orig_ip6h, mp, tsl); } /* * Determines if the packet pointed to by ipha or ip6h is an ICMP error. The * mp argument is only used to do bounds checking. */ static boolean_t is_icmp_error(mblk_t *mp, ipha_t *ipha, ip6_t *ip6h) { uint16_t hlen; if (ipha != NULL) { icmph_t *icmph; ASSERT(ip6h == NULL); if (ipha->ipha_protocol != IPPROTO_ICMP) return (B_FALSE); hlen = IPH_HDR_LENGTH(ipha); icmph = (icmph_t *)((uint8_t *)ipha + hlen); return (ICMP_IS_ERROR(icmph->icmph_type) || icmph->icmph_type == ICMP_REDIRECT); } else { icmp6_t *icmp6; uint8_t *nexthdrp; ASSERT(ip6h != NULL); if (!ip_hdr_length_nexthdr_v6(mp, ip6h, &hlen, &nexthdrp) || *nexthdrp != IPPROTO_ICMPV6) { return (B_FALSE); } icmp6 = (icmp6_t *)((uint8_t *)ip6h + hlen); return (ICMP6_IS_ERROR(icmp6->icmp6_type) || icmp6->icmp6_type == ND_REDIRECT); } } /* * Find inner and outer IP headers from a tunneled packet as setup for calls * into ipsec_tun_{in,out}bound(). * Note that we need to allow the outer header to be in a separate mblk from * the inner header. * If the caller knows the outer_hlen, the caller passes it in. Otherwise zero. */ static size_t iptun_find_headers(mblk_t *mp, size_t outer_hlen, ipha_t **outer4, ipha_t **inner4, ip6_t **outer6, ip6_t **inner6) { ipha_t *ipha; size_t first_mblkl = MBLKL(mp); mblk_t *inner_mp; /* * Don't bother handling packets that don't have a full IP header in * the fist mblk. For the input path, the ip module ensures that this * won't happen, and on the output path, the IP tunneling MAC-type * plugins ensure that this also won't happen. */ if (first_mblkl < sizeof (ipha_t)) return (0); ipha = (ipha_t *)(mp->b_rptr); switch (IPH_HDR_VERSION(ipha)) { case IPV4_VERSION: *outer4 = ipha; *outer6 = NULL; if (outer_hlen == 0) outer_hlen = IPH_HDR_LENGTH(ipha); break; case IPV6_VERSION: *outer4 = NULL; *outer6 = (ip6_t *)ipha; if (outer_hlen == 0) outer_hlen = ip_hdr_length_v6(mp, (ip6_t *)ipha); break; default: return (0); } if (first_mblkl < outer_hlen || (first_mblkl == outer_hlen && mp->b_cont == NULL)) return (0); /* * We don't bother doing a pullup here since the outer header will * just get stripped off soon on input anyway. We just want to ensure * that the inner* pointer points to a full header. */ if (first_mblkl == outer_hlen) { inner_mp = mp->b_cont; ipha = (ipha_t *)inner_mp->b_rptr; } else { inner_mp = mp; ipha = (ipha_t *)(mp->b_rptr + outer_hlen); } switch (IPH_HDR_VERSION(ipha)) { case IPV4_VERSION: if (inner_mp->b_wptr - (uint8_t *)ipha < sizeof (ipha_t)) return (0); *inner4 = ipha; *inner6 = NULL; break; case IPV6_VERSION: if (inner_mp->b_wptr - (uint8_t *)ipha < sizeof (ip6_t)) return (0); *inner4 = NULL; *inner6 = (ip6_t *)ipha; break; default: return (0); } return (outer_hlen); } /* * Received ICMP error in response to an X over IPv4 packet that we * transmitted. * * NOTE: "outer" refers to what's inside the ICMP payload. We will get one of * the following: * * [IPv4(0)][ICMPv4][IPv4(1)][IPv4(2)][ULP] * * or * * [IPv4(0)][ICMPv4][IPv4(1)][IPv6][ULP] * * And "outer4" will get set to IPv4(1), and inner[46] will correspond to * whatever the very-inner packet is (IPv4(2) or IPv6). */ static void iptun_input_icmp_v4(iptun_t *iptun, mblk_t *data_mp, icmph_t *icmph, ip_recv_attr_t *ira) { uint8_t *orig; ipha_t *outer4, *inner4; ip6_t *outer6, *inner6; int outer_hlen; uint8_t type, code; ASSERT(data_mp->b_cont == NULL); /* * Temporarily move b_rptr forward so that iptun_find_headers() can * find headers in the ICMP packet payload. */ orig = data_mp->b_rptr; data_mp->b_rptr = (uint8_t *)(icmph + 1); /* * The ip module ensures that ICMP errors contain at least the * original IP header (otherwise, the error would never have made it * here). */ ASSERT(MBLKL(data_mp) >= 0); outer_hlen = iptun_find_headers(data_mp, 0, &outer4, &inner4, &outer6, &inner6); ASSERT(outer6 == NULL); data_mp->b_rptr = orig; if (outer_hlen == 0) { iptun_drop_pkt(data_mp, &iptun->iptun_ierrors); return; } /* Only ICMP errors due to tunneled packets should reach here. */ ASSERT(outer4->ipha_protocol == IPPROTO_ENCAP || outer4->ipha_protocol == IPPROTO_IPV6); data_mp = ipsec_tun_inbound(ira, data_mp, iptun->iptun_itp, inner4, inner6, outer4, outer6, -outer_hlen, iptun->iptun_ns); if (data_mp == NULL) { /* Callee did all of the freeing. */ atomic_inc_64(&iptun->iptun_ierrors); return; } /* We should never see reassembled fragment here. */ ASSERT(data_mp->b_next == NULL); data_mp->b_rptr = (uint8_t *)outer4 + outer_hlen; /* * If the original packet being transmitted was itself an ICMP error, * then drop this packet. We don't want to generate an ICMP error in * response to an ICMP error. */ if (is_icmp_error(data_mp, inner4, inner6)) { iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf); return; } switch (icmph->icmph_type) { case ICMP_DEST_UNREACHABLE: type = (inner4 != NULL ? icmph->icmph_type : ICMP6_DST_UNREACH); switch (icmph->icmph_code) { case ICMP_FRAGMENTATION_NEEDED: { uint32_t newmtu; /* * We reconcile this with the fact that the tunnel may * also have IPsec policy by letting iptun_update_mtu * take care of it. */ newmtu = iptun_update_mtu(iptun, NULL, ntohs(icmph->icmph_du_mtu)); if (inner4 != NULL) { iptun_icmp_fragneeded_v4(iptun, newmtu, inner4, data_mp, ira->ira_tsl); } else { iptun_icmp_toobig_v6(iptun, newmtu, inner6, data_mp, ira->ira_tsl); } return; } case ICMP_DEST_NET_UNREACH_ADMIN: case ICMP_DEST_HOST_UNREACH_ADMIN: code = (inner4 != NULL ? ICMP_DEST_NET_UNREACH_ADMIN : ICMP6_DST_UNREACH_ADMIN); break; default: code = (inner4 != NULL ? ICMP_HOST_UNREACHABLE : ICMP6_DST_UNREACH_ADDR); break; } break; case ICMP_TIME_EXCEEDED: if (inner6 != NULL) { type = ICMP6_TIME_EXCEEDED; code = 0; } /* else we're already set. */ break; case ICMP_PARAM_PROBLEM: /* * This is a problem with the outer header we transmitted. * Treat this as an output error. */ iptun_drop_pkt(data_mp, &iptun->iptun_oerrors); return; default: iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf); return; } if (inner4 != NULL) { iptun_icmp_error_v4(iptun, inner4, data_mp, type, code, ira->ira_tsl); } else { iptun_icmp_error_v6(iptun, inner6, data_mp, type, code, 0, ira->ira_tsl); } } /* * Return B_TRUE if the IPv6 packet pointed to by ip6h contains a Tunnel * Encapsulation Limit destination option. If there is one, set encaplim_ptr * to point to the option value. */ static boolean_t iptun_find_encaplimit(mblk_t *mp, ip6_t *ip6h, uint8_t **encaplim_ptr) { ip_pkt_t pkt; uint8_t *endptr; ip6_dest_t *destp; struct ip6_opt *optp; pkt.ipp_fields = 0; /* must be initialized */ (void) ip_find_hdr_v6(mp, ip6h, B_FALSE, &pkt, NULL); if ((pkt.ipp_fields & IPPF_DSTOPTS) != 0) { destp = pkt.ipp_dstopts; } else if ((pkt.ipp_fields & IPPF_RTHDRDSTOPTS) != 0) { destp = pkt.ipp_rthdrdstopts; } else { return (B_FALSE); } endptr = (uint8_t *)destp + 8 * (destp->ip6d_len + 1); optp = (struct ip6_opt *)(destp + 1); while (endptr - (uint8_t *)optp > sizeof (*optp)) { if (optp->ip6o_type == IP6OPT_TUNNEL_LIMIT) { if ((uint8_t *)(optp + 1) >= endptr) return (B_FALSE); *encaplim_ptr = (uint8_t *)&optp[1]; return (B_TRUE); } optp = (struct ip6_opt *)((uint8_t *)optp + optp->ip6o_len + 2); } return (B_FALSE); } /* * Received ICMPv6 error in response to an X over IPv6 packet that we * transmitted. * * NOTE: "outer" refers to what's inside the ICMP payload. We will get one of * the following: * * [IPv6(0)][ICMPv6][IPv6(1)][IPv4][ULP] * * or * * [IPv6(0)][ICMPv6][IPv6(1)][IPv6(2)][ULP] * * And "outer6" will get set to IPv6(1), and inner[46] will correspond to * whatever the very-inner packet is (IPv4 or IPv6(2)). */ static void iptun_input_icmp_v6(iptun_t *iptun, mblk_t *data_mp, icmp6_t *icmp6h, ip_recv_attr_t *ira) { uint8_t *orig; ipha_t *outer4, *inner4; ip6_t *outer6, *inner6; int outer_hlen; uint8_t type, code; ASSERT(data_mp->b_cont == NULL); /* * Temporarily move b_rptr forward so that iptun_find_headers() can * find IP headers in the ICMP packet payload. */ orig = data_mp->b_rptr; data_mp->b_rptr = (uint8_t *)(icmp6h + 1); /* * The ip module ensures that ICMP errors contain at least the * original IP header (otherwise, the error would never have made it * here). */ ASSERT(MBLKL(data_mp) >= 0); outer_hlen = iptun_find_headers(data_mp, 0, &outer4, &inner4, &outer6, &inner6); ASSERT(outer4 == NULL); data_mp->b_rptr = orig; /* Restore r_ptr */ if (outer_hlen == 0) { iptun_drop_pkt(data_mp, &iptun->iptun_ierrors); return; } data_mp = ipsec_tun_inbound(ira, data_mp, iptun->iptun_itp, inner4, inner6, outer4, outer6, -outer_hlen, iptun->iptun_ns); if (data_mp == NULL) { /* Callee did all of the freeing. */ atomic_inc_64(&iptun->iptun_ierrors); return; } /* We should never see reassembled fragment here. */ ASSERT(data_mp->b_next == NULL); data_mp->b_rptr = (uint8_t *)outer6 + outer_hlen; /* * If the original packet being transmitted was itself an ICMP error, * then drop this packet. We don't want to generate an ICMP error in * response to an ICMP error. */ if (is_icmp_error(data_mp, inner4, inner6)) { iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf); return; } switch (icmp6h->icmp6_type) { case ICMP6_PARAM_PROB: { uint8_t *encaplim_ptr; /* * If the ICMPv6 error points to a valid Tunnel Encapsulation * Limit option and the limit value is 0, then fall through * and send a host unreachable message. Otherwise, treat the * error as an output error, as there must have been a problem * with a packet we sent. */ if (!iptun_find_encaplimit(data_mp, outer6, &encaplim_ptr) || (icmp6h->icmp6_pptr != ((ptrdiff_t)encaplim_ptr - (ptrdiff_t)outer6)) || *encaplim_ptr != 0) { iptun_drop_pkt(data_mp, &iptun->iptun_oerrors); return; } /* FALLTHRU */ } case ICMP6_TIME_EXCEEDED: case ICMP6_DST_UNREACH: type = (inner4 != NULL ? ICMP_DEST_UNREACHABLE : ICMP6_DST_UNREACH); code = (inner4 != NULL ? ICMP_HOST_UNREACHABLE : ICMP6_DST_UNREACH_ADDR); break; case ICMP6_PACKET_TOO_BIG: { uint32_t newmtu; /* * We reconcile this with the fact that the tunnel may also * have IPsec policy by letting iptun_update_mtu take care of * it. */ newmtu = iptun_update_mtu(iptun, NULL, ntohl(icmp6h->icmp6_mtu)); if (inner4 != NULL) { iptun_icmp_fragneeded_v4(iptun, newmtu, inner4, data_mp, ira->ira_tsl); } else { iptun_icmp_toobig_v6(iptun, newmtu, inner6, data_mp, ira->ira_tsl); } return; } default: iptun_drop_pkt(data_mp, &iptun->iptun_norcvbuf); return; } if (inner4 != NULL) { iptun_icmp_error_v4(iptun, inner4, data_mp, type, code, ira->ira_tsl); } else { iptun_icmp_error_v6(iptun, inner6, data_mp, type, code, 0, ira->ira_tsl); } } /* * Called as conn_recvicmp from IP for ICMP errors. */ /* ARGSUSED2 */ static void iptun_input_icmp(void *arg, mblk_t *mp, void *arg2, ip_recv_attr_t *ira) { conn_t *connp = arg; iptun_t *iptun = connp->conn_iptun; mblk_t *tmpmp; size_t hlen; ASSERT(IPCL_IS_IPTUN(connp)); if (mp->b_cont != NULL) { /* * Since ICMP error processing necessitates access to bits * that are within the ICMP error payload (the original packet * that caused the error), pull everything up into a single * block for convenience. */ if ((tmpmp = msgpullup(mp, -1)) == NULL) { iptun_drop_pkt(mp, &iptun->iptun_norcvbuf); return; } freemsg(mp); mp = tmpmp; } hlen = ira->ira_ip_hdr_length; switch (iptun->iptun_typeinfo->iti_ipvers) { case IPV4_VERSION: /* * The outer IP header coming up from IP is always ipha_t * alligned (otherwise, we would have crashed in ip). */ iptun_input_icmp_v4(iptun, mp, (icmph_t *)(mp->b_rptr + hlen), ira); break; case IPV6_VERSION: iptun_input_icmp_v6(iptun, mp, (icmp6_t *)(mp->b_rptr + hlen), ira); break; } } static boolean_t iptun_in_6to4_ok(iptun_t *iptun, ipha_t *outer4, ip6_t *inner6) { ipaddr_t v4addr; /* * It's possible that someone sent us an IPv4-in-IPv4 packet with the * IPv4 address of a 6to4 tunnel as the destination. */ if (inner6 == NULL) return (B_FALSE); /* * Make sure that the IPv6 destination is within the site that this * 6to4 tunnel is routing for. We don't want people bouncing random * tunneled IPv6 packets through this 6to4 router. */ IN6_6TO4_TO_V4ADDR(&inner6->ip6_dst, (struct in_addr *)&v4addr); if (outer4->ipha_dst != v4addr) return (B_FALSE); if (IN6_IS_ADDR_6TO4(&inner6->ip6_src)) { /* * Section 9 of RFC 3056 (security considerations) suggests * that when a packet is from a 6to4 site (i.e., it's not a * global address being forwarded froma relay router), make * sure that the packet was tunneled by that site's 6to4 * router. */ IN6_6TO4_TO_V4ADDR(&inner6->ip6_src, (struct in_addr *)&v4addr); if (outer4->ipha_src != v4addr) return (B_FALSE); } else { /* * Only accept packets from a relay router if we've configured * outbound relay router functionality. */ if (iptun->iptun_iptuns->iptuns_relay_rtr_addr == INADDR_ANY) return (B_FALSE); } return (B_TRUE); } /* * Input function for everything that comes up from the ip module below us. * This is called directly from the ip module via connp->conn_recv(). * * We receive M_DATA messages with IP-in-IP tunneled packets. */ /* ARGSUSED2 */ static void iptun_input(void *arg, mblk_t *data_mp, void *arg2, ip_recv_attr_t *ira) { conn_t *connp = arg; iptun_t *iptun = connp->conn_iptun; int outer_hlen; ipha_t *outer4, *inner4; ip6_t *outer6, *inner6; ASSERT(IPCL_IS_IPTUN(connp)); ASSERT(DB_TYPE(data_mp) == M_DATA); outer_hlen = iptun_find_headers(data_mp, ira->ira_ip_hdr_length, &outer4, &inner4, &outer6, &inner6); if (outer_hlen == 0) goto drop; /* * If the system is labeled, we call tsol_check_dest() on the packet * destination (our local tunnel address) to ensure that the packet as * labeled should be allowed to be sent to us. We don't need to call * the more involved tsol_receive_local() since the tunnel link itself * cannot be assigned to shared-stack non-global zones. */ if (ira->ira_flags & IRAF_SYSTEM_LABELED) { if (ira->ira_tsl == NULL) goto drop; if (tsol_check_dest(ira->ira_tsl, (outer4 != NULL ? (void *)&outer4->ipha_dst : (void *)&outer6->ip6_dst), (outer4 != NULL ? IPV4_VERSION : IPV6_VERSION), CONN_MAC_DEFAULT, B_FALSE, NULL) != 0) goto drop; } data_mp = ipsec_tun_inbound(ira, data_mp, iptun->iptun_itp, inner4, inner6, outer4, outer6, outer_hlen, iptun->iptun_ns); if (data_mp == NULL) { /* Callee did all of the freeing. */ return; } if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_6TO4 && !iptun_in_6to4_ok(iptun, outer4, inner6)) goto drop; /* * We need to statistically account for each packet individually, so * we might as well split up any b_next chains here. */ do { mblk_t *mp; mp = data_mp->b_next; data_mp->b_next = NULL; atomic_inc_64(&iptun->iptun_ipackets); atomic_add_64(&iptun->iptun_rbytes, msgdsize(data_mp)); mac_rx(iptun->iptun_mh, NULL, data_mp); data_mp = mp; } while (data_mp != NULL); return; drop: iptun_drop_pkt(data_mp, &iptun->iptun_ierrors); } /* * Do 6to4-specific header-processing on output. Return B_TRUE if the packet * was processed without issue, or B_FALSE if the packet had issues and should * be dropped. */ static boolean_t iptun_out_process_6to4(iptun_t *iptun, ipha_t *outer4, ip6_t *inner6) { ipaddr_t v4addr; /* * IPv6 source must be a 6to4 address. This is because a conscious * decision was made to not allow a Solaris system to be used as a * relay router (for security reasons) when 6to4 was initially * integrated. If this decision is ever reversed, the following check * can be removed. */ if (!IN6_IS_ADDR_6TO4(&inner6->ip6_src)) return (B_FALSE); /* * RFC3056 mandates that the IPv4 source MUST be set to the IPv4 * portion of the 6to4 IPv6 source address. In other words, make sure * that we're tunneling packets from our own 6to4 site. */ IN6_6TO4_TO_V4ADDR(&inner6->ip6_src, (struct in_addr *)&v4addr); if (outer4->ipha_src != v4addr) return (B_FALSE); /* * Automatically set the destination of the outer IPv4 header as * described in RFC3056. There are two possibilities: * * a. If the IPv6 destination is a 6to4 address, set the IPv4 address * to the IPv4 portion of the 6to4 address. * b. If the IPv6 destination is a native IPv6 address, set the IPv4 * destination to the address of a relay router. * * Design Note: b shouldn't be necessary here, and this is a flaw in * the design of the 6to4relay command. Instead of setting a 6to4 * relay address in this module via an ioctl, the 6to4relay command * could simply add a IPv6 route for native IPv6 addresses (such as a * default route) in the forwarding table that uses a 6to4 destination * as its next hop, and the IPv4 portion of that address could be a * 6to4 relay address. In order for this to work, IP would have to * resolve the next hop address, which would necessitate a link-layer * address resolver for 6to4 links, which doesn't exist today. * * In fact, if a resolver existed for 6to4 links, then setting the * IPv4 destination in the outer header could be done as part of * link-layer address resolution and fast-path header generation, and * not here. */ if (IN6_IS_ADDR_6TO4(&inner6->ip6_dst)) { /* destination is a 6to4 router */ IN6_6TO4_TO_V4ADDR(&inner6->ip6_dst, (struct in_addr *)&outer4->ipha_dst); /* Reject attempts to send to INADDR_ANY */ if (outer4->ipha_dst == INADDR_ANY) return (B_FALSE); } else { /* * The destination is a native IPv6 address. If output to a * relay-router is enabled, use the relay-router's IPv4 * address as the destination. */ if (iptun->iptun_iptuns->iptuns_relay_rtr_addr == INADDR_ANY) return (B_FALSE); outer4->ipha_dst = iptun->iptun_iptuns->iptuns_relay_rtr_addr; } /* * If the outer source and destination are equal, this means that the * 6to4 router somehow forwarded an IPv6 packet destined for its own * 6to4 site to its 6to4 tunnel interface, which will result in this * packet infinitely bouncing between ip and iptun. */ return (outer4->ipha_src != outer4->ipha_dst); } /* * Process output packets with outer IPv4 headers. Frees mp and bumps stat on * error. */ static mblk_t * iptun_out_process_ipv4(iptun_t *iptun, mblk_t *mp, ipha_t *outer4, ipha_t *inner4, ip6_t *inner6, ip_xmit_attr_t *ixa) { uint8_t *innerptr = (inner4 != NULL ? (uint8_t *)inner4 : (uint8_t *)inner6); size_t minmtu = iptun->iptun_typeinfo->iti_minmtu; if (inner4 != NULL) { ASSERT(outer4->ipha_protocol == IPPROTO_ENCAP); /* * Copy the tos from the inner IPv4 header. We mask off ECN * bits (bits 6 and 7) because there is currently no * tunnel-tunnel communication to determine if both sides * support ECN. We opt for the safe choice: don't copy the * ECN bits when doing encapsulation. */ outer4->ipha_type_of_service = inner4->ipha_type_of_service & ~0x03; } else { ASSERT(outer4->ipha_protocol == IPPROTO_IPV6 && inner6 != NULL); } if (ixa->ixa_flags & IXAF_PMTU_IPV4_DF) outer4->ipha_fragment_offset_and_flags |= IPH_DF_HTONS; else outer4->ipha_fragment_offset_and_flags &= ~IPH_DF_HTONS; /* * As described in section 3.2.2 of RFC4213, if the packet payload is * less than or equal to the minimum MTU size, then we need to allow * IPv4 to fragment the packet. The reason is that even if we end up * receiving an ICMP frag-needed, the interface above this tunnel * won't be allowed to drop its MTU as a result, since the packet was * already smaller than the smallest allowable MTU for that interface. */ if (mp->b_wptr - innerptr <= minmtu) { outer4->ipha_fragment_offset_and_flags = 0; ixa->ixa_flags &= ~IXAF_DONTFRAG; } else if (!(ixa->ixa_flags & IXAF_PMTU_TOO_SMALL) && (iptun->iptun_typeinfo->iti_type != IPTUN_TYPE_6TO4)) { ixa->ixa_flags |= IXAF_DONTFRAG; } ixa->ixa_ip_hdr_length = IPH_HDR_LENGTH(outer4); ixa->ixa_pktlen = msgdsize(mp); ixa->ixa_protocol = outer4->ipha_protocol; outer4->ipha_length = htons(ixa->ixa_pktlen); return (mp); } /* * Insert an encapsulation limit destination option in the packet provided. * Always consumes the mp argument and returns a new mblk pointer. */ static mblk_t * iptun_insert_encaplimit(iptun_t *iptun, mblk_t *mp, ip6_t *outer6, uint8_t limit) { mblk_t *newmp; iptun_ipv6hdrs_t *newouter6; ASSERT(outer6->ip6_nxt == IPPROTO_IPV6); ASSERT(mp->b_cont == NULL); mp->b_rptr += sizeof (ip6_t); newmp = allocb(sizeof (iptun_ipv6hdrs_t) + MBLKL(mp), BPRI_MED); if (newmp == NULL) { iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf); return (NULL); } newmp->b_wptr += sizeof (iptun_ipv6hdrs_t); /* Copy the payload (Starting with the inner IPv6 header). */ bcopy(mp->b_rptr, newmp->b_wptr, MBLKL(mp)); newmp->b_wptr += MBLKL(mp); newouter6 = (iptun_ipv6hdrs_t *)newmp->b_rptr; /* Now copy the outer IPv6 header. */ bcopy(outer6, &newouter6->it6h_ip6h, sizeof (ip6_t)); newouter6->it6h_ip6h.ip6_nxt = IPPROTO_DSTOPTS; newouter6->it6h_encaplim = iptun_encaplim_init; newouter6->it6h_encaplim.iel_destopt.ip6d_nxt = outer6->ip6_nxt; newouter6->it6h_encaplim.iel_telopt.ip6ot_encap_limit = limit; /* * The payload length will be set at the end of * iptun_out_process_ipv6(). */ freemsg(mp); return (newmp); } /* * Process output packets with outer IPv6 headers. Frees mp and bumps stats * on error. */ static mblk_t * iptun_out_process_ipv6(iptun_t *iptun, mblk_t *mp, ip6_t *outer6, ipha_t *inner4, ip6_t *inner6, ip_xmit_attr_t *ixa) { uint8_t *innerptr = (inner4 != NULL ? (uint8_t *)inner4 : (uint8_t *)inner6); size_t minmtu = iptun->iptun_typeinfo->iti_minmtu; uint8_t *limit, *configlimit; uint32_t offset; iptun_ipv6hdrs_t *v6hdrs; if (inner6 != NULL && iptun_find_encaplimit(mp, inner6, &limit)) { /* * The inner packet is an IPv6 packet which itself contains an * encapsulation limit option. The limit variable points to * the value in the embedded option. Process the * encapsulation limit option as specified in RFC 2473. * * If limit is 0, then we've exceeded the limit and we need to * send back an ICMPv6 parameter problem message. * * If limit is > 0, then we decrement it by 1 and make sure * that the encapsulation limit option in the outer header * reflects that (adding an option if one isn't already * there). */ ASSERT(limit > mp->b_rptr && limit < mp->b_wptr); if (*limit == 0) { mp->b_rptr = (uint8_t *)inner6; offset = limit - mp->b_rptr; iptun_icmp_error_v6(iptun, inner6, mp, ICMP6_PARAM_PROB, 0, offset, ixa->ixa_tsl); atomic_inc_64(&iptun->iptun_noxmtbuf); return (NULL); } /* * The outer header requires an encapsulation limit option. * If there isn't one already, add one. */ if (iptun->iptun_encaplimit == 0) { if ((mp = iptun_insert_encaplimit(iptun, mp, outer6, (*limit - 1))) == NULL) return (NULL); v6hdrs = (iptun_ipv6hdrs_t *)mp->b_rptr; } else { /* * There is an existing encapsulation limit option in * the outer header. If the inner encapsulation limit * is less than the configured encapsulation limit, * update the outer encapsulation limit to reflect * this lesser value. */ v6hdrs = (iptun_ipv6hdrs_t *)mp->b_rptr; configlimit = &v6hdrs->it6h_encaplim.iel_telopt.ip6ot_encap_limit; if ((*limit - 1) < *configlimit) *configlimit = (*limit - 1); } ixa->ixa_ip_hdr_length = sizeof (iptun_ipv6hdrs_t); ixa->ixa_protocol = v6hdrs->it6h_encaplim.iel_destopt.ip6d_nxt; } else { ixa->ixa_ip_hdr_length = sizeof (ip6_t); ixa->ixa_protocol = outer6->ip6_nxt; } /* * See iptun_output_process_ipv4() why we allow fragmentation for * small packets */ if (mp->b_wptr - innerptr <= minmtu) ixa->ixa_flags &= ~IXAF_DONTFRAG; else if (!(ixa->ixa_flags & IXAF_PMTU_TOO_SMALL)) ixa->ixa_flags |= IXAF_DONTFRAG; ixa->ixa_pktlen = msgdsize(mp); outer6->ip6_plen = htons(ixa->ixa_pktlen - sizeof (ip6_t)); return (mp); } /* * The IP tunneling MAC-type plugins have already done most of the header * processing and validity checks. We are simply responsible for multiplexing * down to the ip module below us. */ static void iptun_output(iptun_t *iptun, mblk_t *mp) { conn_t *connp = iptun->iptun_connp; mblk_t *newmp; int error; ip_xmit_attr_t *ixa; ASSERT(mp->b_datap->db_type == M_DATA); if (mp->b_cont != NULL) { if ((newmp = msgpullup(mp, -1)) == NULL) { iptun_drop_pkt(mp, &iptun->iptun_noxmtbuf); return; } freemsg(mp); mp = newmp; } if (iptun->iptun_typeinfo->iti_type == IPTUN_TYPE_6TO4) { iptun_output_6to4(iptun, mp); return; } if (is_system_labeled()) { /* * Since the label can be different meaning a potentially * different IRE,we always use a unique ip_xmit_attr_t. */ ixa = conn_get_ixa_exclusive(connp); } else { /* * If no other thread is using conn_ixa this just gets a * reference to conn_ixa. Otherwise we get a safe copy of * conn_ixa. */ ixa = conn_get_ixa(connp, B_FALSE); } if (ixa == NULL) { iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } /* * In case we got a safe copy of conn_ixa, then we need * to fill in any pointers in it. */ if (ixa->ixa_ire == NULL) { error = ip_attr_connect(connp, ixa, &connp->conn_saddr_v6, &connp->conn_faddr_v6, &connp->conn_faddr_v6, 0, NULL, NULL, 0); if (error != 0) { if (ixa->ixa_ire != NULL && (error == EHOSTUNREACH || error == ENETUNREACH)) { /* * Let conn_ip_output/ire_send_noroute return * the error and send any local ICMP error. */ error = 0; } else { ixa_refrele(ixa); iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } } } iptun_output_common(iptun, ixa, mp); ixa_refrele(ixa); } /* * We use an ixa based on the last destination. */ static void iptun_output_6to4(iptun_t *iptun, mblk_t *mp) { conn_t *connp = iptun->iptun_connp; ipha_t *outer4, *inner4; ip6_t *outer6, *inner6; ip_xmit_attr_t *ixa; ip_xmit_attr_t *oldixa; int error; boolean_t need_connect; in6_addr_t v6dst; ASSERT(mp->b_cont == NULL); /* Verified by iptun_output */ /* Make sure we set ipha_dst before we look at ipha_dst */ (void) iptun_find_headers(mp, 0, &outer4, &inner4, &outer6, &inner6); ASSERT(outer4 != NULL); if (!iptun_out_process_6to4(iptun, outer4, inner6)) { iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } if (is_system_labeled()) { /* * Since the label can be different meaning a potentially * different IRE,we always use a unique ip_xmit_attr_t. */ ixa = conn_get_ixa_exclusive(connp); } else { /* * If no other thread is using conn_ixa this just gets a * reference to conn_ixa. Otherwise we get a safe copy of * conn_ixa. */ ixa = conn_get_ixa(connp, B_FALSE); } if (ixa == NULL) { iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } mutex_enter(&connp->conn_lock); if (connp->conn_v4lastdst == outer4->ipha_dst) { need_connect = (ixa->ixa_ire == NULL); } else { /* In case previous destination was multirt */ ip_attr_newdst(ixa); /* * We later update conn_ixa when we update conn_v4lastdst * which enables subsequent packets to avoid redoing * ip_attr_connect */ need_connect = B_TRUE; } mutex_exit(&connp->conn_lock); /* * In case we got a safe copy of conn_ixa, or otherwise we don't * have a current ixa_ire, then we need to fill in any pointers in * the ixa. */ if (need_connect) { IN6_IPADDR_TO_V4MAPPED(outer4->ipha_dst, &v6dst); /* We handle IPsec in iptun_output_common */ error = ip_attr_connect(connp, ixa, &connp->conn_saddr_v6, &v6dst, &v6dst, 0, NULL, NULL, 0); if (error != 0) { if (ixa->ixa_ire != NULL && (error == EHOSTUNREACH || error == ENETUNREACH)) { /* * Let conn_ip_output/ire_send_noroute return * the error and send any local ICMP error. */ error = 0; } else { ixa_refrele(ixa); iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } } } iptun_output_common(iptun, ixa, mp); /* Atomically replace conn_ixa and conn_v4lastdst */ mutex_enter(&connp->conn_lock); if (connp->conn_v4lastdst != outer4->ipha_dst) { /* Remember the dst which corresponds to conn_ixa */ connp->conn_v6lastdst = v6dst; oldixa = conn_replace_ixa(connp, ixa); } else { oldixa = NULL; } mutex_exit(&connp->conn_lock); ixa_refrele(ixa); if (oldixa != NULL) ixa_refrele(oldixa); } /* * Check the destination/label. Modifies *mpp by adding/removing CIPSO. * * We get the label from the message in order to honor the * ULPs/IPs choice of label. This will be NULL for forwarded * packets, neighbor discovery packets and some others. */ static int iptun_output_check_label(mblk_t **mpp, ip_xmit_attr_t *ixa) { cred_t *cr; int adjust; int iplen; int err; ts_label_t *effective_tsl = NULL; ASSERT(is_system_labeled()); cr = msg_getcred(*mpp, NULL); if (cr == NULL) return (0); /* * We need to start with a label based on the IP/ULP above us */ ip_xmit_attr_restore_tsl(ixa, cr); /* * Need to update packet with any CIPSO option since * conn_ip_output doesn't do that. */ if (ixa->ixa_flags & IXAF_IS_IPV4) { ipha_t *ipha; ipha = (ipha_t *)(*mpp)->b_rptr; iplen = ntohs(ipha->ipha_length); err = tsol_check_label_v4(ixa->ixa_tsl, ixa->ixa_zoneid, mpp, CONN_MAC_DEFAULT, B_FALSE, ixa->ixa_ipst, &effective_tsl); if (err != 0) return (err); ipha = (ipha_t *)(*mpp)->b_rptr; adjust = (int)ntohs(ipha->ipha_length) - iplen; } else { ip6_t *ip6h; ip6h = (ip6_t *)(*mpp)->b_rptr; iplen = ntohs(ip6h->ip6_plen); err = tsol_check_label_v6(ixa->ixa_tsl, ixa->ixa_zoneid, mpp, CONN_MAC_DEFAULT, B_FALSE, ixa->ixa_ipst, &effective_tsl); if (err != 0) return (err); ip6h = (ip6_t *)(*mpp)->b_rptr; adjust = (int)ntohs(ip6h->ip6_plen) - iplen; } if (effective_tsl != NULL) { /* Update the label */ ip_xmit_attr_replace_tsl(ixa, effective_tsl); } ixa->ixa_pktlen += adjust; ixa->ixa_ip_hdr_length += adjust; return (0); } static void iptun_output_common(iptun_t *iptun, ip_xmit_attr_t *ixa, mblk_t *mp) { ipsec_tun_pol_t *itp = iptun->iptun_itp; int outer_hlen; mblk_t *newmp; ipha_t *outer4, *inner4; ip6_t *outer6, *inner6; int error; boolean_t update_pktlen; ASSERT(ixa->ixa_ire != NULL); outer_hlen = iptun_find_headers(mp, 0, &outer4, &inner4, &outer6, &inner6); if (outer_hlen == 0) { iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } /* Save IXAF_DONTFRAG value */ iaflags_t dontfrag = ixa->ixa_flags & IXAF_DONTFRAG; /* Perform header processing. */ if (outer4 != NULL) { mp = iptun_out_process_ipv4(iptun, mp, outer4, inner4, inner6, ixa); } else { mp = iptun_out_process_ipv6(iptun, mp, outer6, inner4, inner6, ixa); } if (mp == NULL) return; /* * Let's hope the compiler optimizes this with "branch taken". */ if (itp != NULL && (itp->itp_flags & ITPF_P_ACTIVE)) { /* This updates the ip_xmit_attr_t */ mp = ipsec_tun_outbound(mp, iptun, inner4, inner6, outer4, outer6, outer_hlen, ixa); if (mp == NULL) { atomic_inc_64(&iptun->iptun_oerrors); return; } if (is_system_labeled()) { /* * Might change the packet by adding/removing CIPSO. * After this caller inner* and outer* and outer_hlen * might be invalid. */ error = iptun_output_check_label(&mp, ixa); if (error != 0) { ip2dbg(("label check failed (%d)\n", error)); iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } } /* * ipsec_tun_outbound() returns a chain of tunneled IP * fragments linked with b_next (or a single message if the * tunneled packet wasn't a fragment). * If fragcache returned a list then we need to update * ixa_pktlen for all packets in the list. */ update_pktlen = (mp->b_next != NULL); /* * Otherwise, we're good to go. The ixa has been updated with * instructions for outbound IPsec processing. */ for (newmp = mp; newmp != NULL; newmp = mp) { size_t minmtu = iptun->iptun_typeinfo->iti_minmtu; atomic_inc_64(&iptun->iptun_opackets); atomic_add_64(&iptun->iptun_obytes, ixa->ixa_pktlen); mp = mp->b_next; newmp->b_next = NULL; /* * The IXAF_DONTFRAG flag is global, but there is * a chain here. Check if we're really already * smaller than the minimum allowed MTU and reset here * appropriately. Otherwise one small packet can kill * the whole chain's path mtu discovery. * In addition, update the pktlen to the length of * the actual packet being processed. */ if (update_pktlen) { ixa->ixa_pktlen = msgdsize(newmp); if (ixa->ixa_pktlen <= minmtu) ixa->ixa_flags &= ~IXAF_DONTFRAG; } atomic_inc_64(&iptun->iptun_opackets); atomic_add_64(&iptun->iptun_obytes, ixa->ixa_pktlen); error = conn_ip_output(newmp, ixa); /* Restore IXAF_DONTFRAG value */ ixa->ixa_flags |= dontfrag; if (error == EMSGSIZE) { /* IPsec policy might have changed */ (void) iptun_update_mtu(iptun, ixa, 0); } } } else { /* * The ip module will potentially apply global policy to the * packet in its output path if there's no active tunnel * policy. */ ASSERT(ixa->ixa_ipsec_policy == NULL); mp = ip_output_attach_policy(mp, outer4, outer6, NULL, ixa); if (mp == NULL) { atomic_inc_64(&iptun->iptun_oerrors); return; } if (is_system_labeled()) { /* * Might change the packet by adding/removing CIPSO. * After this caller inner* and outer* and outer_hlen * might be invalid. */ error = iptun_output_check_label(&mp, ixa); if (error != 0) { ip2dbg(("label check failed (%d)\n", error)); iptun_drop_pkt(mp, &iptun->iptun_oerrors); return; } } atomic_inc_64(&iptun->iptun_opackets); atomic_add_64(&iptun->iptun_obytes, ixa->ixa_pktlen); error = conn_ip_output(mp, ixa); if (error == EMSGSIZE) { /* IPsec policy might have changed */ (void) iptun_update_mtu(iptun, ixa, 0); } } if (ixa->ixa_flags & IXAF_IPSEC_SECURE) ipsec_out_release_refs(ixa); } static mac_callbacks_t iptun_m_callbacks = { .mc_callbacks = (MC_SETPROP | MC_GETPROP | MC_PROPINFO), .mc_getstat = iptun_m_getstat, .mc_start = iptun_m_start, .mc_stop = iptun_m_stop, .mc_setpromisc = iptun_m_setpromisc, .mc_multicst = iptun_m_multicst, .mc_unicst = iptun_m_unicst, .mc_tx = iptun_m_tx, .mc_reserved = NULL, .mc_setprop = iptun_m_setprop, .mc_getprop = iptun_m_getprop, .mc_propinfo = iptun_m_propinfo };