/* * ipsec_tun.h : IPSEC tunnel protection * * Copyright (c) 2015 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include <vnet/ipsec/ipsec_tun.h> #include <vnet/ipsec/ipsec_itf.h> #include <vnet/ipsec/esp.h> #include <vnet/udp/udp_local.h> #include <vnet/adj/adj_delegate.h> #include <vnet/adj/adj_midchain.h> #include <vnet/teib/teib.h> /* instantiate the bihash functions */ #include <vppinfra/bihash_8_16.h> #include <vppinfra/bihash_template.c> #include <vppinfra/bihash_24_16.h> #include <vppinfra/bihash_template.c> #define IPSEC_TUN_DEFAULT_HASH_NUM_BUCKETS (64 * 1024) #define IPSEC_TUN_DEFAULT_HASH_MEMORY_SIZE 512 << 20 /** * The logger */ vlib_log_class_t ipsec_tun_protect_logger; /** * Pool of tunnel protection objects */ ipsec_tun_protect_t *ipsec_tun_protect_pool; /** * Adj delegate registered type */ static adj_delegate_type_t ipsec_tun_adj_delegate_type; /** * Adj index to TX SA mapping */ index_t *ipsec_tun_protect_sa_by_adj_index; const ip_address_t IP_ADDR_ALL_0 = IP_ADDRESS_V4_ALL_0S; /** * The DB of all added per-nh tunnel protectiond */ typedef struct ipsec_tun_protect_itf_db_t_ { /** A hash table key'd on IP (4 or 6) address */ uword *id_hash; /** If the interface is P2P then there is only one protect * object associated with the auto-adj for each NH proto */ index_t id_itp; } ipsec_tun_protect_itf_db_t; typedef struct ipsec_tun_protect_db_t_ { /** Per-interface vector */ ipsec_tun_protect_itf_db_t *id_itf; } ipsec_tun_protect_db_t; static ipsec_tun_protect_db_t itp_db; const static ipsec_tun_protect_itf_db_t IPSEC_TUN_PROTECT_DEFAULT_DB_ENTRY = { .id_itp = INDEX_INVALID, }; #define ITP_DBG(_itp, _fmt, _args...) \ { \ vlib_log_debug(ipsec_tun_protect_logger, \ "[%U]: " _fmt, \ format_ipsec_tun_protect, \ _itp, ##_args); \ } #define ITP_DBG2(_fmt, _args...) \ { \ vlib_log_debug(ipsec_tun_protect_logger, \ _fmt, ##_args); \ } static u32 ipsec_tun_node_regs[N_AF]; void ipsec_tun_register_nodes (ip_address_family_t af) { if (0 == ipsec_tun_node_regs[af]++) { if (AF_IP4 == af) { ipsec_register_udp_port (UDP_DST_PORT_ipsec); ip4_register_protocol (IP_PROTOCOL_IPSEC_ESP, ipsec4_tun_input_node.index); } else ip6_register_protocol (IP_PROTOCOL_IPSEC_ESP, ipsec6_tun_input_node.index); } } void ipsec_tun_unregister_nodes (ip_address_family_t af) { ASSERT (0 != ipsec_tun_node_regs[af]); if (0 == --ipsec_tun_node_regs[af]) { if (AF_IP4 == af) { ipsec_unregister_udp_port (UDP_DST_PORT_ipsec); ip4_unregister_protocol (IP_PROTOCOL_IPSEC_ESP); } else ip6_unregister_protocol (IP_PROTOCOL_IPSEC_ESP); } } static inline const ipsec_tun_protect_t * ipsec_tun_protect_from_const_base (const adj_delegate_t * ad) { if (ad == NULL) return (NULL); return (pool_elt_at_index (ipsec_tun_protect_pool, ad->ad_index)); } static u32 ipsec_tun_protect_get_adj_next (vnet_link_t linkt, const ipsec_tun_protect_t * itp) { ipsec_main_t *im; ipsec_sa_t *sa; u32 next; if (!(itp->itp_flags & IPSEC_PROTECT_ITF)) { if (ip46_address_is_ip4 (&itp->itp_tun.src)) linkt = VNET_LINK_IP4; else linkt = VNET_LINK_IP6; } sa = ipsec_sa_get (itp->itp_out_sa); im = &ipsec_main; next = 0; if ((sa->crypto_alg == IPSEC_CRYPTO_ALG_NONE && sa->integ_alg == IPSEC_INTEG_ALG_NONE) && !(itp->itp_flags & IPSEC_PROTECT_ITF)) next = (VNET_LINK_IP4 == linkt ? im->esp4_no_crypto_tun_node_index : im->esp6_no_crypto_tun_node_index); else if (itp->itp_flags & IPSEC_PROTECT_L2) next = (VNET_LINK_IP4 == linkt ? im->esp4_encrypt_l2_tun_node_index : im->esp6_encrypt_l2_tun_node_index); else { switch (linkt) { case VNET_LINK_IP4: next = im->esp4_encrypt_tun_node_index; break; case VNET_LINK_IP6: next = im->esp6_encrypt_tun_node_index; break; case VNET_LINK_MPLS: next = im->esp_mpls_encrypt_tun_node_index; break; case VNET_LINK_ARP: case VNET_LINK_NSH: case VNET_LINK_ETHERNET: ASSERT (0); break; } } return (next); } static void ipsec_tun_protect_add_adj (adj_index_t ai, const ipsec_tun_protect_t * itp) { vec_validate_init_empty (ipsec_tun_protect_sa_by_adj_index, ai, INDEX_INVALID); if (NULL == itp) { ipsec_tun_protect_sa_by_adj_index[ai] = INDEX_INVALID; adj_nbr_midchain_reset_next_node (ai); } else { ipsec_tun_protect_sa_by_adj_index[ai] = itp->itp_out_sa; adj_nbr_midchain_update_next_node (ai, ipsec_tun_protect_get_adj_next (adj_get_link_type (ai), itp)); } } static index_t ipsec_tun_protect_find (u32 sw_if_index, const ip_address_t * nh) { ipsec_tun_protect_itf_db_t *idi; uword *p; if (vec_len (itp_db.id_itf) <= sw_if_index) return INDEX_INVALID; if (vnet_sw_interface_is_p2p (vnet_get_main (), sw_if_index)) return (itp_db.id_itf[sw_if_index].id_itp); idi = &itp_db.id_itf[sw_if_index]; p = hash_get_mem (idi->id_hash, nh); if (NULL == p) { return INDEX_INVALID; } return (p[0]); } static void ipsec_tun_protect_rx_db_add (ipsec_main_t * im, const ipsec_tun_protect_t * itp) { const ipsec_sa_t *sa; u32 sai; if (ip46_address_is_zero (&itp->itp_crypto.dst)) return; /* *INDENT-OFF* */ FOR_EACH_IPSEC_PROTECT_INPUT_SAI(itp, sai, ({ sa = ipsec_sa_get (sai); ipsec_tun_lkup_result_t res = { .tun_index = itp - ipsec_tun_protect_pool, .sa_index = sai, .flags = itp->itp_flags, .sw_if_index = itp->itp_sw_if_index, }; /* * The key is formed from the tunnel's destination * as the packet lookup is done from the packet's source */ if (ip46_address_is_ip4 (&itp->itp_crypto.dst)) { ipsec4_tunnel_kv_t key = { .value = res, }; clib_bihash_kv_8_16_t *bkey = (clib_bihash_kv_8_16_t*)&key; ipsec4_tunnel_mk_key(&key, &itp->itp_crypto.dst.ip4, clib_host_to_net_u32 (sa->spi)); if (!clib_bihash_is_initialised_8_16 (&im->tun4_protect_by_key)) clib_bihash_init_8_16 (&im->tun4_protect_by_key, "IPSec IPv4 tunnels", IPSEC_TUN_DEFAULT_HASH_NUM_BUCKETS, IPSEC_TUN_DEFAULT_HASH_MEMORY_SIZE); clib_bihash_add_del_8_16 (&im->tun4_protect_by_key, bkey, 1); ipsec_tun_register_nodes (AF_IP4); } else { ipsec6_tunnel_kv_t key = { .key = { .remote_ip = itp->itp_crypto.dst.ip6, .spi = clib_host_to_net_u32 (sa->spi), }, .value = res, }; clib_bihash_kv_24_16_t *bkey = (clib_bihash_kv_24_16_t*)&key; if (!clib_bihash_is_initialised_24_16 (&im->tun6_protect_by_key)) clib_bihash_init_24_16 (&im->tun6_protect_by_key, "IPSec IPv6 tunnels", IPSEC_TUN_DEFAULT_HASH_NUM_BUCKETS, IPSEC_TUN_DEFAULT_HASH_MEMORY_SIZE); clib_bihash_add_del_24_16 (&im->tun6_protect_by_key, bkey, 1); ipsec_tun_register_nodes (AF_IP6); } })) /* *INDENT-ON* */ } static adj_walk_rc_t ipsec_tun_protect_adj_add (adj_index_t ai, void *arg) { ipsec_tun_protect_t *itp = arg; adj_delegate_add (adj_get (ai), ipsec_tun_adj_delegate_type, itp - ipsec_tun_protect_pool); ipsec_tun_protect_add_adj (ai, itp); if (itp->itp_flags & IPSEC_PROTECT_ITF) ipsec_itf_adj_stack (ai, itp->itp_out_sa); return (ADJ_WALK_RC_CONTINUE); } static void ipsec_tun_protect_tx_db_add (ipsec_tun_protect_t * itp) { /* * add the delegate to the adj */ ipsec_tun_protect_itf_db_t *idi; fib_protocol_t nh_proto; ip46_address_t nh; vec_validate_init_empty (itp_db.id_itf, itp->itp_sw_if_index, IPSEC_TUN_PROTECT_DEFAULT_DB_ENTRY); idi = &itp_db.id_itf[itp->itp_sw_if_index]; if (vnet_sw_interface_is_p2p (vnet_get_main (), itp->itp_sw_if_index)) { if (INDEX_INVALID == idi->id_itp) { // ipsec_tun_protect_feature_set (itp, 1); } idi->id_itp = itp - ipsec_tun_protect_pool; FOR_EACH_FIB_IP_PROTOCOL (nh_proto) adj_nbr_walk (itp->itp_sw_if_index, nh_proto, ipsec_tun_protect_adj_add, itp); } else { if (NULL == idi->id_hash) { idi->id_hash = hash_create_mem (0, sizeof (ip_address_t), sizeof (uword)); /* * enable the encrypt feature for egress if this is the first addition * on this interface */ // ipsec_tun_protect_feature_set (itp, 1); } hash_set_mem (idi->id_hash, itp->itp_key, itp - ipsec_tun_protect_pool); /* * walk all the adjs with the same nh on this interface * to associate them with this protection */ nh_proto = ip_address_to_46 (itp->itp_key, &nh); adj_nbr_walk_nh (itp->itp_sw_if_index, nh_proto, &nh, ipsec_tun_protect_adj_add, itp); ipsec_tun_register_nodes (FIB_PROTOCOL_IP6 == nh_proto ? AF_IP6 : AF_IP4); } } static void ipsec_tun_protect_rx_db_remove (ipsec_main_t * im, const ipsec_tun_protect_t * itp) { const ipsec_sa_t *sa; /* *INDENT-OFF* */ FOR_EACH_IPSEC_PROTECT_INPUT_SA(itp, sa, ({ if (ip46_address_is_ip4 (&itp->itp_crypto.dst)) { ipsec4_tunnel_kv_t key; clib_bihash_kv_8_16_t res, *bkey = (clib_bihash_kv_8_16_t*)&key; ipsec4_tunnel_mk_key(&key, &itp->itp_crypto.dst.ip4, clib_host_to_net_u32 (sa->spi)); if (!clib_bihash_search_8_16 (&im->tun4_protect_by_key, bkey, &res)) { clib_bihash_add_del_8_16 (&im->tun4_protect_by_key, bkey, 0); ipsec_tun_unregister_nodes(AF_IP4); } } else { ipsec6_tunnel_kv_t key = { .key = { .remote_ip = itp->itp_crypto.dst.ip6, .spi = clib_host_to_net_u32 (sa->spi), }, }; clib_bihash_kv_24_16_t res, *bkey = (clib_bihash_kv_24_16_t*)&key; if (!clib_bihash_search_24_16 (&im->tun6_protect_by_key, bkey, &res)) { clib_bihash_add_del_24_16 (&im->tun6_protect_by_key, bkey, 0); ipsec_tun_unregister_nodes(AF_IP6); } } })); /* *INDENT-ON* */ } static adj_walk_rc_t ipsec_tun_protect_adj_remove (adj_index_t ai, void *arg) { ipsec_tun_protect_t *itp = arg; adj_delegate_remove (ai, ipsec_tun_adj_delegate_type); ipsec_tun_protect_add_adj (ai, NULL); if (itp->itp_flags & IPSEC_PROTECT_ITF) ipsec_itf_adj_unstack (ai); return (ADJ_WALK_RC_CONTINUE); } static void ipsec_tun_protect_tx_db_remove (ipsec_tun_protect_t * itp) { ipsec_tun_protect_itf_db_t *idi; fib_protocol_t nh_proto; ip46_address_t nh; nh_proto = ip_address_to_46 (itp->itp_key, &nh); idi = &itp_db.id_itf[itp->itp_sw_if_index]; if (vnet_sw_interface_is_p2p (vnet_get_main (), itp->itp_sw_if_index)) { // ipsec_tun_protect_feature_set (itp, 0); idi->id_itp = INDEX_INVALID; FOR_EACH_FIB_IP_PROTOCOL (nh_proto) adj_nbr_walk (itp->itp_sw_if_index, nh_proto, ipsec_tun_protect_adj_remove, itp); } else { adj_nbr_walk_nh (itp->itp_sw_if_index, nh_proto, &nh, ipsec_tun_protect_adj_remove, itp); hash_unset_mem (idi->id_hash, itp->itp_key); if (0 == hash_elts (idi->id_hash)) { // ipsec_tun_protect_feature_set (itp, 0); hash_free (idi->id_hash); idi->id_hash = NULL; } ipsec_tun_unregister_nodes (FIB_PROTOCOL_IP6 == nh_proto ? AF_IP6 : AF_IP4); } } static void ipsec_tun_protect_set_crypto_addr (ipsec_tun_protect_t * itp) { ipsec_sa_t *sa; /* *INDENT-OFF* */ FOR_EACH_IPSEC_PROTECT_INPUT_SA(itp, sa, ({ if (ipsec_sa_is_set_IS_TUNNEL (sa)) { itp->itp_crypto.src = ip_addr_46 (&sa->tunnel.t_dst); itp->itp_crypto.dst = ip_addr_46 (&sa->tunnel.t_src); if (!(itp->itp_flags & IPSEC_PROTECT_ITF)) { ipsec_sa_set_IS_PROTECT (sa); itp->itp_flags |= IPSEC_PROTECT_ENCAPED; } } else { itp->itp_crypto.src = itp->itp_tun.src; itp->itp_crypto.dst = itp->itp_tun.dst; itp->itp_flags &= ~IPSEC_PROTECT_ENCAPED; } })); /* *INDENT-ON* */ } static void ipsec_tun_protect_config (ipsec_main_t * im, ipsec_tun_protect_t * itp, u32 sa_out, u32 * sas_in) { index_t sai; u32 ii; itp->itp_n_sa_in = vec_len (sas_in); for (ii = 0; ii < itp->itp_n_sa_in; ii++) itp->itp_in_sas[ii] = sas_in[ii]; itp->itp_out_sa = sa_out; ipsec_sa_lock (itp->itp_out_sa); /* *INDENT-OFF* */ FOR_EACH_IPSEC_PROTECT_INPUT_SAI(itp, sai, ({ ipsec_sa_lock(sai); })); ipsec_tun_protect_set_crypto_addr(itp); /* *INDENT-ON* */ /* * add to the DB against each SA */ ipsec_tun_protect_rx_db_add (im, itp); ipsec_tun_protect_tx_db_add (itp); ITP_DBG (itp, "configured"); } static void ipsec_tun_protect_unconfig (ipsec_main_t * im, ipsec_tun_protect_t * itp) { ipsec_sa_t *sa; index_t sai; /* *INDENT-OFF* */ FOR_EACH_IPSEC_PROTECT_INPUT_SA(itp, sa, ({ ipsec_sa_unset_IS_PROTECT (sa); })); ipsec_tun_protect_rx_db_remove (im, itp); ipsec_tun_protect_tx_db_remove (itp); ipsec_sa_unlock(itp->itp_out_sa); FOR_EACH_IPSEC_PROTECT_INPUT_SAI(itp, sai, ({ ipsec_sa_unlock(sai); })); /* *INDENT-ON* */ ITP_DBG (itp, "unconfigured"); } static void ipsec_tun_protect_update_from_teib (ipsec_tun_protect_t * itp, const teib_entry_t * ne) { if (NULL != ne) { const fib_prefix_t *pfx; pfx = teib_entry_get_nh (ne); ip46_address_copy (&itp->itp_tun.dst, &pfx->fp_addr); } else ip46_address_reset (&itp->itp_tun.dst); } int ipsec_tun_protect_update (u32 sw_if_index, const ip_address_t * nh, u32 sa_out, u32 * sas_in) { ipsec_tun_protect_t *itp; u32 itpi, ii, *saip; ipsec_main_t *im; int rv; ITP_DBG2 ("update: %U/%U", format_vnet_sw_if_index_name, vnet_get_main (), sw_if_index, format_ip_address, nh); if (vec_len (sas_in) > ITP_MAX_N_SA_IN) { rv = VNET_API_ERROR_LIMIT_EXCEEDED; goto out; } rv = 0; im = &ipsec_main; if (NULL == nh) nh = &IP_ADDR_ALL_0; itpi = ipsec_tun_protect_find (sw_if_index, nh); vec_foreach_index (ii, sas_in) { sas_in[ii] = ipsec_sa_find_and_lock (sas_in[ii]); if (~0 == sas_in[ii]) { rv = VNET_API_ERROR_INVALID_VALUE; goto out; } } sa_out = ipsec_sa_find_and_lock (sa_out); if (~0 == sa_out) { rv = VNET_API_ERROR_INVALID_VALUE; goto out; } if (INDEX_INVALID == itpi) { vnet_device_class_t *dev_class; vnet_hw_interface_t *hi; vnet_main_t *vnm; u8 is_l2; vnm = vnet_get_main (); hi = vnet_get_sup_hw_interface (vnm, sw_if_index); dev_class = vnet_get_device_class (vnm, hi->dev_class_index); if (NULL == dev_class->ip_tun_desc) { rv = VNET_API_ERROR_INVALID_SW_IF_INDEX; goto out; } pool_get_zero (ipsec_tun_protect_pool, itp); itp->itp_sw_if_index = sw_if_index; itp->itp_ai = ADJ_INDEX_INVALID; itp->itp_n_sa_in = vec_len (sas_in); for (ii = 0; ii < itp->itp_n_sa_in; ii++) itp->itp_in_sas[ii] = sas_in[ii]; itp->itp_out_sa = sa_out; itp->itp_key = clib_mem_alloc (sizeof (*itp->itp_key)); ip_address_copy (itp->itp_key, nh); rv = dev_class->ip_tun_desc (sw_if_index, &itp->itp_tun.src, &itp->itp_tun.dst, &is_l2); if (rv) goto out; if (ip46_address_is_zero (&itp->itp_tun.src)) { /* * must be one of those pesky ipsec interfaces that has no encap. * the encap then MUST come from the tunnel mode SA. */ ipsec_sa_t *sa; sa = ipsec_sa_get (itp->itp_out_sa); if (!ipsec_sa_is_set_IS_TUNNEL (sa)) { rv = VNET_API_ERROR_INVALID_DST_ADDRESS; goto out; } itp->itp_flags |= IPSEC_PROTECT_ITF; } else if (ip46_address_is_zero (&itp->itp_tun.dst)) { /* tunnel has no destination address, presumably because it's p2mp in which case we use the nh that this is protection for */ ipsec_tun_protect_update_from_teib (itp, teib_entry_find (sw_if_index, nh)); } if (is_l2) itp->itp_flags |= IPSEC_PROTECT_L2; /* * add to the tunnel DB for ingress * - if the SA is in trasnport mode, then the packates will arrive * with the IP src,dst of the protected tunnel, in which case we can * simply strip the IP header and hand the payload to the protocol * appropriate input handler * - if the SA is in tunnel mode then there are two IP headers present * one for the crytpo tunnel endpoints (described in the SA) and one * for the tunnel endpoints. The outer IP headers in the srriving * packets will have the crypto endpoints. So the DB needs to contain * the crpto endpoint. Once the crypto header is stripped, revealing, * the tunnel-IP we have 2 choices: * 1) do a tunnel lookup based on the revealed header * 2) skip the tunnel lookup and assume that the packet matches the * one that is protected here. * If we did 1) then we would allow our peer to use the SA for tunnel * X to inject traffic onto tunnel Y, this is not good. If we do 2) * then we don't verify that the peer is indeed using SA for tunnel * X and addressing tunnel X. So we take a compromise, once the SA * matches to tunnel X we veriy that the inner IP matches the value * of the tunnel we are protecting, else it's dropped. */ ipsec_tun_protect_config (im, itp, sa_out, sas_in); } else { /* updating SAs only */ itp = pool_elt_at_index (ipsec_tun_protect_pool, itpi); ipsec_tun_protect_unconfig (im, itp); ipsec_tun_protect_config (im, itp, sa_out, sas_in); } ipsec_sa_unlock (sa_out); vec_foreach (saip, sas_in) ipsec_sa_unlock (*saip); vec_free (sas_in); out: return (rv); } int ipsec_tun_protect_del (u32 sw_if_index, const ip_address_t * nh) { ipsec_tun_protect_t *itp; ipsec_main_t *im; index_t itpi; ITP_DBG2 ("delete: %U/%U", format_vnet_sw_if_index_name, vnet_get_main (), sw_if_index, format_ip_address, nh); im = &ipsec_main; if (NULL == nh) nh = &IP_ADDR_ALL_0; itpi = ipsec_tun_protect_find (sw_if_index, nh); if (INDEX_INVALID == itpi) return (VNET_API_ERROR_NO_SUCH_ENTRY); itp = ipsec_tun_protect_get (itpi); ipsec_tun_protect_unconfig (im, itp); if (ADJ_INDEX_INVALID != itp->itp_ai) adj_unlock (itp->itp_ai); clib_mem_free (itp->itp_key); pool_put (ipsec_tun_protect_pool, itp); return (0); } void ipsec_tun_protect_walk (ipsec_tun_protect_walk_cb_t fn, void *ctx) { index_t itpi; /* *INDENT-OFF* */ pool_foreach_index (itpi, ipsec_tun_protect_pool) { fn (itpi, ctx); } /* *INDENT-ON* */ } void ipsec_tun_protect_walk_itf (u32 sw_if_index, ipsec_tun_protect_walk_cb_t fn, void *ctx) { ipsec_tun_protect_itf_db_t *idi; ip_address_t *key; index_t itpi; if (vec_len (itp_db.id_itf) <= sw_if_index) return; idi = &itp_db.id_itf[sw_if_index]; /* *INDENT-OFF* */ hash_foreach(key, itpi, idi->id_hash, ({ fn (itpi, ctx); })); /* *INDENT-ON* */ if (INDEX_INVALID != idi->id_itp) fn (idi->id_itp, ctx); } static void ipsec_tun_feature_update (u32 sw_if_index, u8 arc_index, u8 is_enable, void *data) { ipsec_tun_protect_t *itp; index_t itpi; if (arc_index != feature_main.device_input_feature_arc_index) return; /* Only p2p tunnels supported */ itpi = ipsec_tun_protect_find (sw_if_index, &IP_ADDR_ALL_0); if (itpi == INDEX_INVALID) return; itp = ipsec_tun_protect_get (itpi); if (is_enable) { u32 decrypt_tun = ip46_address_is_ip4 (&itp->itp_crypto.dst) ? ipsec_main.esp4_decrypt_tun_node_index : ipsec_main.esp6_decrypt_tun_node_index; vnet_feature_modify_end_node ( feature_main.device_input_feature_arc_index, sw_if_index, decrypt_tun); itp->itp_flags |= IPSEC_PROTECT_FEAT; } else { u32 eth_in = vlib_get_node_by_name (vlib_get_main (), (u8 *) "ethernet-input") ->index; vnet_feature_modify_end_node ( feature_main.device_input_feature_arc_index, sw_if_index, eth_in); itp->itp_flags &= ~IPSEC_PROTECT_FEAT; } /* Propagate flag change into lookup entries */ ipsec_tun_protect_rx_db_remove (&ipsec_main, itp); ipsec_tun_protect_rx_db_add (&ipsec_main, itp); } static void ipsec_tun_protect_adj_delegate_adj_deleted (adj_delegate_t * ad) { /* remove our delegate */ ipsec_tun_protect_add_adj (ad->ad_adj_index, NULL); adj_delegate_remove (ad->ad_adj_index, ipsec_tun_adj_delegate_type); } static void ipsec_tun_protect_adj_delegate_adj_modified (adj_delegate_t * ad) { ipsec_tun_protect_add_adj (ad->ad_adj_index, ipsec_tun_protect_get (ad->ad_index)); } static void ipsec_tun_protect_adj_delegate_adj_created (adj_index_t ai) { /* add our delegate if there is protection for this neighbour */ ip_address_t ip = IP_ADDRESS_V4_ALL_0S; ip_adjacency_t *adj; index_t itpi; if (!adj_is_midchain (ai)) return; adj = adj_get (ai); ip_address_from_46 (&adj->sub_type.midchain.next_hop, adj->ia_nh_proto, &ip); itpi = ipsec_tun_protect_find (adj->rewrite_header.sw_if_index, &ip); if (INDEX_INVALID != itpi) ipsec_tun_protect_adj_add (ai, ipsec_tun_protect_get (itpi)); } static u8 * ipsec_tun_protect_adj_delegate_format (const adj_delegate_t * aed, u8 * s) { const ipsec_tun_protect_t *itp; itp = ipsec_tun_protect_from_const_base (aed); s = format (s, "ipsec-tun-protect:\n%U", format_ipsec_tun_protect, itp); return (s); } static void ipsec_tun_teib_entry_added (const teib_entry_t * ne) { ipsec_tun_protect_t *itp; index_t itpi; itpi = ipsec_tun_protect_find (teib_entry_get_sw_if_index (ne), teib_entry_get_peer (ne)); if (INDEX_INVALID == itpi) return; itp = ipsec_tun_protect_get (itpi); ipsec_tun_protect_rx_db_remove (&ipsec_main, itp); ipsec_tun_protect_update_from_teib (itp, ne); ipsec_tun_protect_set_crypto_addr (itp); ipsec_tun_protect_rx_db_add (&ipsec_main, itp); ITP_DBG (itp, "teib-added"); } static void ipsec_tun_teib_entry_deleted (const teib_entry_t * ne) { ipsec_tun_protect_t *itp; index_t itpi; itpi = ipsec_tun_protect_find (teib_entry_get_sw_if_index (ne), teib_entry_get_peer (ne)); if (INDEX_INVALID == itpi) return; itp = ipsec_tun_protect_get (itpi); ipsec_tun_protect_rx_db_remove (&ipsec_main, itp); ipsec_tun_protect_update_from_teib (itp, NULL); ipsec_tun_protect_set_crypto_addr (itp); ITP_DBG (itp, "teib-removed"); } /** * VFT registered with the adjacency delegate */ const static adj_delegate_vft_t ipsec_tun_adj_delegate_vft = { .adv_adj_deleted = ipsec_tun_protect_adj_delegate_adj_deleted, .adv_adj_created = ipsec_tun_protect_adj_delegate_adj_created, .adv_adj_modified = ipsec_tun_protect_adj_delegate_adj_modified, .adv_format = ipsec_tun_protect_adj_delegate_format, }; const static teib_vft_t ipsec_tun_teib_vft = { .nv_added = ipsec_tun_teib_entry_added, .nv_deleted = ipsec_tun_teib_entry_deleted, }; static void ipsec_tun_table_init (ip_address_family_t af, uword table_size, u32 n_buckets) { ipsec_main_t *im; im = &ipsec_main; if (AF_IP4 == af) clib_bihash_init_8_16 (&im->tun4_protect_by_key, "IPSec IPv4 tunnels", n_buckets, table_size); else clib_bihash_init_24_16 (&im->tun6_protect_by_key, "IPSec IPv6 tunnels", n_buckets, table_size); } static clib_error_t * ipsec_tunnel_protect_init (vlib_main_t *vm) { ipsec_main_t *im; im = &ipsec_main; clib_bihash_init_24_16 (&im->tun6_protect_by_key, "IPSec IPv6 tunnels", IPSEC_TUN_DEFAULT_HASH_NUM_BUCKETS, IPSEC_TUN_DEFAULT_HASH_MEMORY_SIZE); clib_bihash_init_8_16 (&im->tun4_protect_by_key, "IPSec IPv4 tunnels", IPSEC_TUN_DEFAULT_HASH_NUM_BUCKETS, IPSEC_TUN_DEFAULT_HASH_MEMORY_SIZE); /* set up feature nodes to drop outbound packets with no crypto alg set */ im->esp4_no_crypto_tun_node_index = vlib_get_node_by_name (vm, (u8 *) "esp4-no-crypto")->index; im->esp6_no_crypto_tun_node_index = vlib_get_node_by_name (vm, (u8 *) "esp6-no-crypto")->index; im->esp6_encrypt_l2_tun_node_index = vlib_get_node_by_name (vm, (u8 *) "esp6-encrypt-tun")->index; im->esp4_encrypt_l2_tun_node_index = vlib_get_node_by_name (vm, (u8 *) "esp4-encrypt-tun")->index; ipsec_tun_adj_delegate_type = adj_delegate_register_new_type (&ipsec_tun_adj_delegate_vft); ipsec_tun_protect_logger = vlib_log_register_class ("ipsec", "tun"); teib_register (&ipsec_tun_teib_vft); vnet_feature_register (ipsec_tun_feature_update, NULL); return 0; } VLIB_INIT_FUNCTION (ipsec_tunnel_protect_init); static clib_error_t * ipsec_config (vlib_main_t * vm, unformat_input_t * input) { unformat_input_t sub_input; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "ip4 %U", unformat_vlib_cli_sub_input, &sub_input)) { uword table_size = ~0; u32 n_buckets = ~0; while (unformat_check_input (&sub_input) != UNFORMAT_END_OF_INPUT) { if (unformat (&sub_input, "num-buckets %u", &n_buckets)) ; else return clib_error_return (0, "unknown input `%U'", format_unformat_error, &sub_input); } ipsec_tun_table_init (AF_IP4, table_size, n_buckets); } else if (unformat (input, "ip6 %U", unformat_vlib_cli_sub_input, &sub_input)) { uword table_size = ~0; u32 n_buckets = ~0; while (unformat_check_input (&sub_input) != UNFORMAT_END_OF_INPUT) { if (unformat (&sub_input, "num-buckets %u", &n_buckets)) ; else return clib_error_return (0, "unknown input `%U'", format_unformat_error, &sub_input); } ipsec_tun_table_init (AF_IP6, table_size, n_buckets); } else return clib_error_return (0, "unknown input `%U'", format_unformat_error, input); } return 0; } VLIB_CONFIG_FUNCTION (ipsec_config, "ipsec"); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */