/* * snat.c - simple nat plugin * * Copyright (c) 2016 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include snat_main_t snat_main; /* *INDENT-OFF* */ /* Hook up input features */ VNET_FEATURE_INIT (ip4_snat_in2out, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-in2out", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_out2in, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-out2in", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", "ip4-dhcp-client-detect"), }; VNET_FEATURE_INIT (ip4_nat_classify, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-classify", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_det_in2out, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-det-in2out", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_det_out2in, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-det-out2in", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", "ip4-dhcp-client-detect"), }; VNET_FEATURE_INIT (ip4_nat_det_classify, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-det-classify", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_nat44_ed_in2out, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-ed-in2out", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_nat44_ed_out2in, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-ed-out2in", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", "ip4-dhcp-client-detect"), }; VNET_FEATURE_INIT (ip4_nat44_ed_classify, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-ed-classify", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_in2out_worker_handoff, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-in2out-worker-handoff", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_out2in_worker_handoff, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-out2in-worker-handoff", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", "ip4-dhcp-client-detect"), }; VNET_FEATURE_INIT (ip4_nat_handoff_classify, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-handoff-classify", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_in2out_fast, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-in2out-fast", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_out2in_fast, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-out2in-fast", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa", "ip4-dhcp-client-detect"), }; VNET_FEATURE_INIT (ip4_snat_hairpin_dst, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-hairpin-dst", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; VNET_FEATURE_INIT (ip4_nat44_ed_hairpin_dst, static) = { .arc_name = "ip4-unicast", .node_name = "nat44-ed-hairpin-dst", .runs_after = VNET_FEATURES ("acl-plugin-in-ip4-fa"), }; /* Hook up output features */ VNET_FEATURE_INIT (ip4_snat_in2out_output, static) = { .arc_name = "ip4-output", .node_name = "nat44-in2out-output", .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_in2out_output_worker_handoff, static) = { .arc_name = "ip4-output", .node_name = "nat44-in2out-output-worker-handoff", .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"), }; VNET_FEATURE_INIT (ip4_snat_hairpin_src, static) = { .arc_name = "ip4-output", .node_name = "nat44-hairpin-src", .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"), }; VNET_FEATURE_INIT (ip4_nat44_ed_in2out_output, static) = { .arc_name = "ip4-output", .node_name = "nat44-ed-in2out-output", .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"), }; VNET_FEATURE_INIT (ip4_nat44_ed_hairpin_src, static) = { .arc_name = "ip4-output", .node_name = "nat44-ed-hairpin-src", .runs_after = VNET_FEATURES ("acl-plugin-out-ip4-fa"), }; /* Hook up ip4-local features */ VNET_FEATURE_INIT (ip4_nat_hairpinning, static) = { .arc_name = "ip4-local", .node_name = "nat44-hairpinning", .runs_before = VNET_FEATURES("ip4-local-end-of-arc"), }; VNET_FEATURE_INIT (ip4_nat44_ed_hairpinning, static) = { .arc_name = "ip4-local", .node_name = "nat44-ed-hairpinning", .runs_before = VNET_FEATURES("ip4-local-end-of-arc"), }; VLIB_PLUGIN_REGISTER () = { .version = VPP_BUILD_VER, .description = "Network Address Translation (NAT)", }; /* *INDENT-ON* */ void nat_free_session_data (snat_main_t * sm, snat_session_t * s, u32 thread_index, u8 is_ha) { snat_session_key_t key; clib_bihash_kv_8_8_t kv; nat_ed_ses_key_t ed_key; clib_bihash_kv_16_8_t ed_kv; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_index); if (is_fwd_bypass_session (s)) { if (snat_is_unk_proto_session (s)) { ed_key.proto = s->in2out.port; ed_key.r_port = 0; ed_key.l_port = 0; } else { ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol); ed_key.l_port = s->in2out.port; ed_key.r_port = s->ext_host_port; } ed_key.l_addr = s->in2out.addr; ed_key.r_addr = s->ext_host_addr; ed_key.fib_index = 0; ed_kv.key[0] = ed_key.as_u64[0]; ed_kv.key[1] = ed_key.as_u64[1]; if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0)) nat_log_warn ("in2out_ed key del failed"); return; } /* session lookup tables */ if (is_ed_session (s)) { if (is_affinity_sessions (s)) nat_affinity_unlock (s->ext_host_addr, s->out2in.addr, s->in2out.protocol, s->out2in.port); ed_key.l_addr = s->out2in.addr; ed_key.r_addr = s->ext_host_addr; ed_key.fib_index = s->out2in.fib_index; if (snat_is_unk_proto_session (s)) { ed_key.proto = s->in2out.port; ed_key.r_port = 0; ed_key.l_port = 0; } else { ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol); ed_key.l_port = s->out2in.port; ed_key.r_port = s->ext_host_port; } ed_kv.key[0] = ed_key.as_u64[0]; ed_kv.key[1] = ed_key.as_u64[1]; if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &ed_kv, 0)) nat_log_warn ("out2in_ed key del failed"); ed_key.l_addr = s->in2out.addr; ed_key.fib_index = s->in2out.fib_index; if (!snat_is_unk_proto_session (s)) ed_key.l_port = s->in2out.port; if (is_twice_nat_session (s)) { ed_key.r_addr = s->ext_host_nat_addr; ed_key.r_port = s->ext_host_nat_port; } ed_kv.key[0] = ed_key.as_u64[0]; ed_kv.key[1] = ed_key.as_u64[1]; if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0)) nat_log_warn ("in2out_ed key del failed"); if (!is_ha) nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index, &s->in2out.addr, s->in2out.port, &s->ext_host_nat_addr, s->ext_host_nat_port, &s->out2in.addr, s->out2in.port, &s->ext_host_addr, s->ext_host_port, s->in2out.protocol, is_twice_nat_session (s)); } else { kv.key = s->in2out.as_u64; if (clib_bihash_add_del_8_8 (&tsm->in2out, &kv, 0)) nat_log_warn ("in2out key del failed"); kv.key = s->out2in.as_u64; if (clib_bihash_add_del_8_8 (&tsm->out2in, &kv, 0)) nat_log_warn ("out2in key del failed"); if (!is_ha) nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index, &s->in2out.addr, s->in2out.port, &s->out2in.addr, s->out2in.port, s->in2out.protocol); } if (snat_is_unk_proto_session (s)) return; if (!is_ha) { /* log NAT event */ snat_ipfix_logging_nat44_ses_delete (thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->in2out.protocol, s->in2out.port, s->out2in.port, s->in2out.fib_index); nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr, s->ext_host_port, s->out2in.protocol, s->out2in.fib_index, thread_index); } /* Twice NAT address and port for external host */ if (is_twice_nat_session (s)) { key.protocol = s->in2out.protocol; key.port = s->ext_host_nat_port; key.addr.as_u32 = s->ext_host_nat_addr.as_u32; snat_free_outside_address_and_port (sm->twice_nat_addresses, thread_index, &key); } if (snat_is_session_static (s)) return; snat_free_outside_address_and_port (sm->addresses, thread_index, &s->out2in); } snat_user_t * nat_user_get_or_create (snat_main_t * sm, ip4_address_t * addr, u32 fib_index, u32 thread_index) { snat_user_t *u = 0; snat_user_key_t user_key; clib_bihash_kv_8_8_t kv, value; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; dlist_elt_t *per_user_list_head_elt; user_key.addr.as_u32 = addr->as_u32; user_key.fib_index = fib_index; kv.key = user_key.as_u64; /* Ever heard of the "user" = src ip4 address before? */ if (clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) { /* no, make a new one */ pool_get (tsm->users, u); clib_memset (u, 0, sizeof (*u)); u->addr.as_u32 = addr->as_u32; u->fib_index = fib_index; pool_get (tsm->list_pool, per_user_list_head_elt); u->sessions_per_user_list_head_index = per_user_list_head_elt - tsm->list_pool; clib_dlist_init (tsm->list_pool, u->sessions_per_user_list_head_index); kv.value = u - tsm->users; /* add user */ if (clib_bihash_add_del_8_8 (&tsm->user_hash, &kv, 1)) nat_log_warn ("user_hash keay add failed"); vlib_set_simple_counter (&sm->total_users, thread_index, 0, pool_elts (tsm->users)); } else { u = pool_elt_at_index (tsm->users, value.value); } return u; } snat_session_t * nat_session_alloc_or_recycle (snat_main_t * sm, snat_user_t * u, u32 thread_index, f64 now) { snat_session_t *s; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; u32 oldest_per_user_translation_list_index, session_index; dlist_elt_t *oldest_per_user_translation_list_elt; dlist_elt_t *per_user_translation_list_elt; /* Over quota? Recycle the least recently used translation */ if ((u->nsessions + u->nstaticsessions) >= sm->max_translations_per_user) { oldest_per_user_translation_list_index = clib_dlist_remove_head (tsm->list_pool, u->sessions_per_user_list_head_index); ASSERT (oldest_per_user_translation_list_index != ~0); /* Add it back to the end of the LRU list */ clib_dlist_addtail (tsm->list_pool, u->sessions_per_user_list_head_index, oldest_per_user_translation_list_index); /* Get the list element */ oldest_per_user_translation_list_elt = pool_elt_at_index (tsm->list_pool, oldest_per_user_translation_list_index); /* Get the session index from the list element */ session_index = oldest_per_user_translation_list_elt->value; /* Get the session */ s = pool_elt_at_index (tsm->sessions, session_index); nat_free_session_data (sm, s, thread_index, 0); if (snat_is_session_static (s)) u->nstaticsessions--; else u->nsessions--; s->flags = 0; s->total_bytes = 0; s->total_pkts = 0; s->state = 0; s->ext_host_addr.as_u32 = 0; s->ext_host_port = 0; s->ext_host_nat_addr.as_u32 = 0; s->ext_host_nat_port = 0; } else { pool_get (tsm->sessions, s); clib_memset (s, 0, sizeof (*s)); /* Create list elts */ pool_get (tsm->list_pool, per_user_translation_list_elt); clib_dlist_init (tsm->list_pool, per_user_translation_list_elt - tsm->list_pool); per_user_translation_list_elt->value = s - tsm->sessions; s->per_user_index = per_user_translation_list_elt - tsm->list_pool; s->per_user_list_head_index = u->sessions_per_user_list_head_index; clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, per_user_translation_list_elt - tsm->list_pool); s->user_index = u - tsm->users; vlib_set_simple_counter (&sm->total_sessions, thread_index, 0, pool_elts (tsm->sessions)); } s->ha_last_refreshed = now; return s; } snat_session_t * nat_ed_session_alloc (snat_main_t * sm, snat_user_t * u, u32 thread_index, f64 now) { snat_session_t *s; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; dlist_elt_t *per_user_translation_list_elt, *oldest_elt; u32 oldest_index; u64 sess_timeout_time; if (PREDICT_FALSE (!(u->nsessions) && !(u->nstaticsessions))) goto alloc_new; oldest_index = clib_dlist_remove_head (tsm->list_pool, u->sessions_per_user_list_head_index); oldest_elt = pool_elt_at_index (tsm->list_pool, oldest_index); s = pool_elt_at_index (tsm->sessions, oldest_elt->value); sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s); if (now >= sess_timeout_time) { clib_dlist_addtail (tsm->list_pool, u->sessions_per_user_list_head_index, oldest_index); nat_free_session_data (sm, s, thread_index, 0); if (snat_is_session_static (s)) u->nstaticsessions--; else u->nsessions--; s->flags = 0; s->total_bytes = 0; s->total_pkts = 0; s->state = 0; s->ext_host_addr.as_u32 = 0; s->ext_host_port = 0; s->ext_host_nat_addr.as_u32 = 0; s->ext_host_nat_port = 0; } else { clib_dlist_addhead (tsm->list_pool, u->sessions_per_user_list_head_index, oldest_index); if ((u->nsessions + u->nstaticsessions) >= sm->max_translations_per_user) { nat_log_warn ("max translations per user %U", format_ip4_address, &u->addr); snat_ipfix_logging_max_entries_per_user (thread_index, sm->max_translations_per_user, u->addr.as_u32); return 0; } else { alloc_new: pool_get (tsm->sessions, s); clib_memset (s, 0, sizeof (*s)); /* Create list elts */ pool_get (tsm->list_pool, per_user_translation_list_elt); clib_dlist_init (tsm->list_pool, per_user_translation_list_elt - tsm->list_pool); per_user_translation_list_elt->value = s - tsm->sessions; s->per_user_index = per_user_translation_list_elt - tsm->list_pool; s->per_user_list_head_index = u->sessions_per_user_list_head_index; clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, per_user_translation_list_elt - tsm->list_pool); } vlib_set_simple_counter (&sm->total_sessions, thread_index, 0, pool_elts (tsm->sessions)); } s->ha_last_refreshed = now; return s; } void snat_add_del_addr_to_fib (ip4_address_t * addr, u8 p_len, u32 sw_if_index, int is_add) { fib_prefix_t prefix = { .fp_len = p_len, .fp_proto = FIB_PROTOCOL_IP4, .fp_addr = { .ip4.as_u32 = addr->as_u32, }, }; u32 fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index); if (is_add) fib_table_entry_update_one_path (fib_index, &prefix, FIB_SOURCE_PLUGIN_LOW, (FIB_ENTRY_FLAG_CONNECTED | FIB_ENTRY_FLAG_LOCAL | FIB_ENTRY_FLAG_EXCLUSIVE), DPO_PROTO_IP4, NULL, sw_if_index, ~0, 1, NULL, FIB_ROUTE_PATH_FLAG_NONE); else fib_table_entry_delete (fib_index, &prefix, FIB_SOURCE_PLUGIN_LOW); } int snat_add_address (snat_main_t * sm, ip4_address_t * addr, u32 vrf_id, u8 twice_nat) { snat_address_t *ap; snat_interface_t *i; vlib_thread_main_t *tm = vlib_get_thread_main (); if (twice_nat && !sm->endpoint_dependent) return VNET_API_ERROR_FEATURE_DISABLED; /* Check if address already exists */ /* *INDENT-OFF* */ vec_foreach (ap, twice_nat ? sm->twice_nat_addresses : sm->addresses) { if (ap->addr.as_u32 == addr->as_u32) return VNET_API_ERROR_VALUE_EXIST; } /* *INDENT-ON* */ if (twice_nat) vec_add2 (sm->twice_nat_addresses, ap, 1); else vec_add2 (sm->addresses, ap, 1); ap->addr = *addr; if (vrf_id != ~0) ap->fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, FIB_SOURCE_PLUGIN_LOW); else ap->fib_index = ~0; #define _(N, i, n, s) \ clib_bitmap_alloc (ap->busy_##n##_port_bitmap, 65535); \ ap->busy_##n##_ports = 0; \ ap->busy_##n##_ports_per_thread = 0;\ vec_validate_init_empty (ap->busy_##n##_ports_per_thread, tm->n_vlib_mains - 1, 0); foreach_snat_protocol #undef _ if (twice_nat) return 0; /* Add external address to FIB */ /* *INDENT-OFF* */ pool_foreach (i, sm->interfaces, ({ if (nat_interface_is_inside(i) || sm->out2in_dpo) continue; snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1); break; })); pool_foreach (i, sm->output_feature_interfaces, ({ if (nat_interface_is_inside(i) || sm->out2in_dpo) continue; snat_add_del_addr_to_fib(addr, 32, i->sw_if_index, 1); break; })); /* *INDENT-ON* */ return 0; } static int is_snat_address_used_in_static_mapping (snat_main_t * sm, ip4_address_t addr) { snat_static_mapping_t *m; /* *INDENT-OFF* */ pool_foreach (m, sm->static_mappings, ({ if (is_addr_only_static_mapping (m) || is_out2in_only_static_mapping (m) || is_identity_static_mapping (m)) continue; if (m->external_addr.as_u32 == addr.as_u32) return 1; })); /* *INDENT-ON* */ return 0; } void increment_v4_address (ip4_address_t * a) { u32 v; v = clib_net_to_host_u32 (a->as_u32) + 1; a->as_u32 = clib_host_to_net_u32 (v); } static void snat_add_static_mapping_when_resolved (snat_main_t * sm, ip4_address_t l_addr, u16 l_port, u32 sw_if_index, u16 e_port, u32 vrf_id, snat_protocol_t proto, int addr_only, int is_add, u8 * tag, int twice_nat, int out2in_only, int identity_nat) { snat_static_map_resolve_t *rp; vec_add2 (sm->to_resolve, rp, 1); rp->l_addr.as_u32 = l_addr.as_u32; rp->l_port = l_port; rp->sw_if_index = sw_if_index; rp->e_port = e_port; rp->vrf_id = vrf_id; rp->proto = proto; rp->addr_only = addr_only; rp->is_add = is_add; rp->twice_nat = twice_nat; rp->out2in_only = out2in_only; rp->identity_nat = identity_nat; rp->tag = vec_dup (tag); } static u32 get_thread_idx_by_port (u16 e_port) { snat_main_t *sm = &snat_main; u32 thread_idx = sm->num_workers; if (sm->num_workers > 1) { thread_idx = sm->first_worker_index + sm->workers[(e_port - 1024) / sm->port_per_thread]; } return thread_idx; } int snat_add_static_mapping (ip4_address_t l_addr, ip4_address_t e_addr, u16 l_port, u16 e_port, u32 vrf_id, int addr_only, u32 sw_if_index, snat_protocol_t proto, int is_add, twice_nat_type_t twice_nat, u8 out2in_only, u8 * tag, u8 identity_nat) { snat_main_t *sm = &snat_main; snat_static_mapping_t *m; snat_session_key_t m_key; clib_bihash_kv_8_8_t kv, value; snat_address_t *a = 0; u32 fib_index = ~0; snat_interface_t *interface; int i; snat_main_per_thread_data_t *tsm; snat_user_key_t u_key; snat_user_t *u; dlist_elt_t *head, *elt; u32 elt_index, head_index; u32 ses_index; u64 user_index; snat_session_t *s; snat_static_map_resolve_t *rp, *rp_match = 0; nat44_lb_addr_port_t *local; u32 find = ~0; if (!sm->endpoint_dependent) { if (twice_nat || out2in_only) return VNET_API_ERROR_FEATURE_DISABLED; } /* If the external address is a specific interface address */ if (sw_if_index != ~0) { ip4_address_t *first_int_addr; for (i = 0; i < vec_len (sm->to_resolve); i++) { rp = sm->to_resolve + i; if (rp->sw_if_index != sw_if_index || rp->l_addr.as_u32 != l_addr.as_u32 || rp->vrf_id != vrf_id || rp->addr_only != addr_only) continue; if (!addr_only) { if ((rp->l_port != l_port && rp->e_port != e_port) || rp->proto != proto) continue; } rp_match = rp; break; } /* Might be already set... */ first_int_addr = ip4_interface_first_address (sm->ip4_main, sw_if_index, 0 /* just want the address */ ); if (is_add) { if (rp_match) return VNET_API_ERROR_VALUE_EXIST; snat_add_static_mapping_when_resolved (sm, l_addr, l_port, sw_if_index, e_port, vrf_id, proto, addr_only, is_add, tag, twice_nat, out2in_only, identity_nat); /* DHCP resolution required? */ if (first_int_addr == 0) { return 0; } else { e_addr.as_u32 = first_int_addr->as_u32; /* Identity mapping? */ if (l_addr.as_u32 == 0) l_addr.as_u32 = e_addr.as_u32; } } else { if (!rp_match) return VNET_API_ERROR_NO_SUCH_ENTRY; vec_del1 (sm->to_resolve, i); if (first_int_addr) { e_addr.as_u32 = first_int_addr->as_u32; /* Identity mapping? */ if (l_addr.as_u32 == 0) l_addr.as_u32 = e_addr.as_u32; } else return 0; } } m_key.addr = e_addr; m_key.port = addr_only ? 0 : e_port; m_key.protocol = addr_only ? 0 : proto; m_key.fib_index = 0; kv.key = m_key.as_u64; if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) m = 0; else m = pool_elt_at_index (sm->static_mappings, value.value); if (is_add) { if (m) { if (is_identity_static_mapping (m)) { /* *INDENT-OFF* */ pool_foreach (local, m->locals, ({ if (local->vrf_id == vrf_id) return VNET_API_ERROR_VALUE_EXIST; })); /* *INDENT-ON* */ pool_get (m->locals, local); local->vrf_id = vrf_id; local->fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, FIB_SOURCE_PLUGIN_LOW); m_key.addr = m->local_addr; m_key.port = m->local_port; m_key.protocol = m->proto; m_key.fib_index = local->fib_index; kv.key = m_key.as_u64; kv.value = m - sm->static_mappings; clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1); return 0; } else return VNET_API_ERROR_VALUE_EXIST; } if (twice_nat && addr_only) return VNET_API_ERROR_UNSUPPORTED; /* Convert VRF id to FIB index */ if (vrf_id != ~0) fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, FIB_SOURCE_PLUGIN_LOW); /* If not specified use inside VRF id from SNAT plugin startup config */ else { fib_index = sm->inside_fib_index; vrf_id = sm->inside_vrf_id; } if (!(out2in_only || identity_nat)) { m_key.addr = l_addr; m_key.port = addr_only ? 0 : l_port; m_key.protocol = addr_only ? 0 : proto; m_key.fib_index = fib_index; kv.key = m_key.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value)) return VNET_API_ERROR_VALUE_EXIST; } /* Find external address in allocated addresses and reserve port for address and port pair mapping when dynamic translations enabled */ if (!(addr_only || sm->static_mapping_only || out2in_only)) { for (i = 0; i < vec_len (sm->addresses); i++) { if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) { a = sm->addresses + i; /* External port must be unused */ switch (proto) { #define _(N, j, n, s) \ case SNAT_PROTOCOL_##N: \ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, e_port)) \ return VNET_API_ERROR_INVALID_VALUE; \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 1); \ if (e_port > 1024) \ { \ a->busy_##n##_ports++; \ a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \ } \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return VNET_API_ERROR_INVALID_VALUE_2; } break; } } /* External address must be allocated */ if (!a && (l_addr.as_u32 != e_addr.as_u32)) { if (sw_if_index != ~0) { for (i = 0; i < vec_len (sm->to_resolve); i++) { rp = sm->to_resolve + i; if (rp->addr_only) continue; if (rp->sw_if_index != sw_if_index && rp->l_addr.as_u32 != l_addr.as_u32 && rp->vrf_id != vrf_id && rp->l_port != l_port && rp->e_port != e_port && rp->proto != proto) continue; vec_del1 (sm->to_resolve, i); break; } } return VNET_API_ERROR_NO_SUCH_ENTRY; } } pool_get (sm->static_mappings, m); clib_memset (m, 0, sizeof (*m)); m->tag = vec_dup (tag); m->local_addr = l_addr; m->external_addr = e_addr; m->twice_nat = twice_nat; if (out2in_only) m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY; if (addr_only) m->flags |= NAT_STATIC_MAPPING_FLAG_ADDR_ONLY; if (identity_nat) { m->flags |= NAT_STATIC_MAPPING_FLAG_IDENTITY_NAT; pool_get (m->locals, local); local->vrf_id = vrf_id; local->fib_index = fib_index; } else { m->vrf_id = vrf_id; m->fib_index = fib_index; } if (!addr_only) { m->local_port = l_port; m->external_port = e_port; m->proto = proto; } if (sm->num_workers > 1) { ip4_header_t ip = { .src_address = m->local_addr, }; vec_add1 (m->workers, sm->worker_in2out_cb (&ip, m->fib_index)); tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]); } else tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); m_key.addr = m->local_addr; m_key.port = m->local_port; m_key.protocol = m->proto; m_key.fib_index = fib_index; kv.key = m_key.as_u64; kv.value = m - sm->static_mappings; if (!out2in_only) clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1); m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.fib_index = 0; kv.key = m_key.as_u64; kv.value = m - sm->static_mappings; clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1); /* Delete dynamic sessions matching local address (+ local port) */ if (!(sm->static_mapping_only)) { u_key.addr = m->local_addr; u_key.fib_index = m->fib_index; kv.key = u_key.as_u64; if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) { user_index = value.value; u = pool_elt_at_index (tsm->users, user_index); if (u->nsessions) { head_index = u->sessions_per_user_list_head_index; head = pool_elt_at_index (tsm->list_pool, head_index); elt_index = head->next; elt = pool_elt_at_index (tsm->list_pool, elt_index); ses_index = elt->value; while (ses_index != ~0) { s = pool_elt_at_index (tsm->sessions, ses_index); elt = pool_elt_at_index (tsm->list_pool, elt->next); ses_index = elt->value; if (snat_is_session_static (s)) continue; if (!addr_only && (clib_net_to_host_u16 (s->in2out.port) != m->local_port)) continue; nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); nat44_delete_session (sm, s, tsm - sm->per_thread_data); if (!addr_only && !sm->endpoint_dependent) break; } } } } } else { if (!m) { if (sw_if_index != ~0) return 0; else return VNET_API_ERROR_NO_SUCH_ENTRY; } if (identity_nat) { if (vrf_id == ~0) vrf_id = sm->inside_vrf_id; /* *INDENT-OFF* */ pool_foreach (local, m->locals, ({ if (local->vrf_id == vrf_id) find = local - m->locals; })); /* *INDENT-ON* */ if (find == ~0) return VNET_API_ERROR_NO_SUCH_ENTRY; local = pool_elt_at_index (m->locals, find); fib_index = local->fib_index; pool_put (m->locals, local); } else fib_index = m->fib_index; /* Free external address port */ if (!(addr_only || sm->static_mapping_only || out2in_only)) { for (i = 0; i < vec_len (sm->addresses); i++) { if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) { a = sm->addresses + i; switch (proto) { #define _(N, j, n, s) \ case SNAT_PROTOCOL_##N: \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 0); \ if (e_port > 1024) \ { \ a->busy_##n##_ports--; \ a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \ } \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return VNET_API_ERROR_INVALID_VALUE_2; } break; } } } if (sm->num_workers > 1) tsm = vec_elt_at_index (sm->per_thread_data, m->workers[0]); else tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); m_key.addr = m->local_addr; m_key.port = m->local_port; m_key.protocol = m->proto; m_key.fib_index = fib_index; kv.key = m_key.as_u64; if (!out2in_only) clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0); /* Delete session(s) for static mapping if exist */ if (!(sm->static_mapping_only) || (sm->static_mapping_only && sm->static_mapping_connection_tracking)) { u_key.addr = m->local_addr; u_key.fib_index = fib_index; kv.key = u_key.as_u64; if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) { user_index = value.value; u = pool_elt_at_index (tsm->users, user_index); if (u->nstaticsessions) { head_index = u->sessions_per_user_list_head_index; head = pool_elt_at_index (tsm->list_pool, head_index); elt_index = head->next; elt = pool_elt_at_index (tsm->list_pool, elt_index); ses_index = elt->value; while (ses_index != ~0) { s = pool_elt_at_index (tsm->sessions, ses_index); elt = pool_elt_at_index (tsm->list_pool, elt->next); ses_index = elt->value; if (!addr_only) { if ((s->out2in.addr.as_u32 != e_addr.as_u32) || (clib_net_to_host_u16 (s->out2in.port) != e_port)) continue; } if (is_lb_session (s)) continue; if (!snat_is_session_static (s)) continue; nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); nat44_delete_session (sm, s, tsm - sm->per_thread_data); if (!addr_only && !sm->endpoint_dependent) break; } } } } fib_table_unlock (fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_LOW); if (pool_elts (m->locals)) return 0; m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.fib_index = 0; kv.key = m_key.as_u64; clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0); vec_free (m->tag); vec_free (m->workers); /* Delete static mapping from pool */ pool_put (sm->static_mappings, m); } if (!addr_only || (l_addr.as_u32 == e_addr.as_u32)) return 0; /* Add/delete external address to FIB */ /* *INDENT-OFF* */ pool_foreach (interface, sm->interfaces, ({ if (nat_interface_is_inside(interface) || sm->out2in_dpo) continue; snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add); break; })); pool_foreach (interface, sm->output_feature_interfaces, ({ if (nat_interface_is_inside(interface) || sm->out2in_dpo) continue; snat_add_del_addr_to_fib(&e_addr, 32, interface->sw_if_index, is_add); break; })); /* *INDENT-ON* */ return 0; } int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port, snat_protocol_t proto, nat44_lb_addr_port_t * locals, u8 is_add, twice_nat_type_t twice_nat, u8 out2in_only, u8 * tag, u32 affinity) { snat_main_t *sm = &snat_main; snat_static_mapping_t *m; snat_session_key_t m_key; clib_bihash_kv_8_8_t kv, value; snat_address_t *a = 0; int i; nat44_lb_addr_port_t *local; u32 elt_index, head_index, ses_index; snat_main_per_thread_data_t *tsm; snat_user_key_t u_key; snat_user_t *u; snat_session_t *s; dlist_elt_t *head, *elt; uword *bitmap = 0; if (!sm->endpoint_dependent) return VNET_API_ERROR_FEATURE_DISABLED; m_key.addr = e_addr; m_key.port = e_port; m_key.protocol = proto; m_key.fib_index = 0; kv.key = m_key.as_u64; if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) m = 0; else m = pool_elt_at_index (sm->static_mappings, value.value); if (is_add) { if (m) return VNET_API_ERROR_VALUE_EXIST; if (vec_len (locals) < 2) return VNET_API_ERROR_INVALID_VALUE; /* Find external address in allocated addresses and reserve port for address and port pair mapping when dynamic translations enabled */ if (!(sm->static_mapping_only || out2in_only)) { for (i = 0; i < vec_len (sm->addresses); i++) { if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) { a = sm->addresses + i; /* External port must be unused */ switch (proto) { #define _(N, j, n, s) \ case SNAT_PROTOCOL_##N: \ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, e_port)) \ return VNET_API_ERROR_INVALID_VALUE; \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 1); \ if (e_port > 1024) \ { \ a->busy_##n##_ports++; \ a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]++; \ } \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return VNET_API_ERROR_INVALID_VALUE_2; } break; } } /* External address must be allocated */ if (!a) return VNET_API_ERROR_NO_SUCH_ENTRY; } pool_get (sm->static_mappings, m); clib_memset (m, 0, sizeof (*m)); m->tag = vec_dup (tag); m->external_addr = e_addr; m->external_port = e_port; m->proto = proto; m->twice_nat = twice_nat; m->flags |= NAT_STATIC_MAPPING_FLAG_LB; if (out2in_only) m->flags |= NAT_STATIC_MAPPING_FLAG_OUT2IN_ONLY; m->affinity = affinity; if (affinity) m->affinity_per_service_list_head_index = nat_affinity_get_per_service_list_head_index (); else m->affinity_per_service_list_head_index = ~0; m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.protocol = m->proto; m_key.fib_index = 0; kv.key = m_key.as_u64; kv.value = m - sm->static_mappings; if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 1)) { nat_log_err ("static_mapping_by_external key add failed"); return VNET_API_ERROR_UNSPECIFIED; } m_key.fib_index = m->fib_index; for (i = 0; i < vec_len (locals); i++) { locals[i].fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, locals[i].vrf_id, FIB_SOURCE_PLUGIN_LOW); m_key.addr = locals[i].addr; m_key.fib_index = locals[i].fib_index; if (!out2in_only) { m_key.port = locals[i].port; kv.key = m_key.as_u64; kv.value = m - sm->static_mappings; clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1); } locals[i].prefix = (i == 0) ? locals[i].probability : (locals[i - 1].prefix + locals[i].probability); pool_get (m->locals, local); *local = locals[i]; if (sm->num_workers > 1) { ip4_header_t ip = { .src_address = locals[i].addr, }; bitmap = clib_bitmap_set (bitmap, sm->worker_in2out_cb (&ip, m->fib_index), 1); } } /* Assign workers */ if (sm->num_workers > 1) { /* *INDENT-OFF* */ clib_bitmap_foreach (i, bitmap, ({ vec_add1(m->workers, i); })); /* *INDENT-ON* */ } } else { if (!m) return VNET_API_ERROR_NO_SUCH_ENTRY; if (!is_lb_static_mapping (m)) return VNET_API_ERROR_INVALID_VALUE; /* Free external address port */ if (!(sm->static_mapping_only || out2in_only)) { for (i = 0; i < vec_len (sm->addresses); i++) { if (sm->addresses[i].addr.as_u32 == e_addr.as_u32) { a = sm->addresses + i; switch (proto) { #define _(N, j, n, s) \ case SNAT_PROTOCOL_##N: \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, e_port, 0); \ if (e_port > 1024) \ { \ a->busy_##n##_ports--; \ a->busy_##n##_ports_per_thread[get_thread_idx_by_port(e_port)]--; \ } \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return VNET_API_ERROR_INVALID_VALUE_2; } break; } } } m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.protocol = m->proto; m_key.fib_index = 0; kv.key = m_key.as_u64; if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_external, &kv, 0)) { nat_log_err ("static_mapping_by_external key del failed"); return VNET_API_ERROR_UNSPECIFIED; } /* *INDENT-OFF* */ pool_foreach (local, m->locals, ({ fib_table_unlock (local->fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_LOW); m_key.addr = local->addr; if (!out2in_only) { m_key.port = local->port; m_key.fib_index = local->fib_index; kv.key = m_key.as_u64; if (clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0)) { nat_log_err ("static_mapping_by_local key del failed"); return VNET_API_ERROR_UNSPECIFIED; } } if (sm->num_workers > 1) { ip4_header_t ip = { .src_address = local->addr, }; tsm = vec_elt_at_index (sm->per_thread_data, sm->worker_in2out_cb (&ip, m->fib_index)); } else tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); /* Delete sessions */ u_key.addr = local->addr; u_key.fib_index = local->fib_index; kv.key = u_key.as_u64; if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) { u = pool_elt_at_index (tsm->users, value.value); if (u->nstaticsessions) { head_index = u->sessions_per_user_list_head_index; head = pool_elt_at_index (tsm->list_pool, head_index); elt_index = head->next; elt = pool_elt_at_index (tsm->list_pool, elt_index); ses_index = elt->value; while (ses_index != ~0) { s = pool_elt_at_index (tsm->sessions, ses_index); elt = pool_elt_at_index (tsm->list_pool, elt->next); ses_index = elt->value; if (!(is_lb_session (s))) continue; if ((s->in2out.addr.as_u32 != local->addr.as_u32) || (clib_net_to_host_u16 (s->in2out.port) != local->port)) continue; nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); nat44_delete_session (sm, s, tsm - sm->per_thread_data); } } } })); /* *INDENT-ON* */ if (m->affinity) nat_affinity_flush_service (m->affinity_per_service_list_head_index); pool_free (m->locals); vec_free (m->tag); vec_free (m->workers); pool_put (sm->static_mappings, m); } return 0; } int nat44_lb_static_mapping_add_del_local (ip4_address_t e_addr, u16 e_port, ip4_address_t l_addr, u16 l_port, snat_protocol_t proto, u32 vrf_id, u8 probability, u8 is_add) { snat_main_t *sm = &snat_main; snat_static_mapping_t *m = 0; snat_session_key_t m_key; clib_bihash_kv_8_8_t kv, value; nat44_lb_addr_port_t *local, *prev_local, *match_local = 0; snat_main_per_thread_data_t *tsm; snat_user_key_t u_key; snat_user_t *u; snat_session_t *s; dlist_elt_t *head, *elt; u32 elt_index, head_index, ses_index, *locals = 0; uword *bitmap = 0; int i; if (!sm->endpoint_dependent) return VNET_API_ERROR_FEATURE_DISABLED; m_key.addr = e_addr; m_key.port = e_port; m_key.protocol = proto; m_key.fib_index = 0; kv.key = m_key.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) m = pool_elt_at_index (sm->static_mappings, value.value); if (!m) return VNET_API_ERROR_NO_SUCH_ENTRY; if (!is_lb_static_mapping (m)) return VNET_API_ERROR_INVALID_VALUE; /* *INDENT-OFF* */ pool_foreach (local, m->locals, ({ if ((local->addr.as_u32 == l_addr.as_u32) && (local->port == l_port) && (local->vrf_id == vrf_id)) { match_local = local; break; } })); /* *INDENT-ON* */ if (is_add) { if (match_local) return VNET_API_ERROR_VALUE_EXIST; pool_get (m->locals, local); clib_memset (local, 0, sizeof (*local)); local->addr.as_u32 = l_addr.as_u32; local->port = l_port; local->probability = probability; local->vrf_id = vrf_id; local->fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, FIB_SOURCE_PLUGIN_LOW); if (!is_out2in_only_static_mapping (m)) { m_key.addr = l_addr; m_key.port = l_port; m_key.fib_index = local->fib_index; kv.key = m_key.as_u64; kv.value = m - sm->static_mappings; if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 1)) nat_log_err ("static_mapping_by_local key add failed"); } } else { if (!match_local) return VNET_API_ERROR_NO_SUCH_ENTRY; if (pool_elts (m->locals) < 3) return VNET_API_ERROR_UNSPECIFIED; fib_table_unlock (match_local->fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_LOW); if (!is_out2in_only_static_mapping (m)) { m_key.addr = l_addr; m_key.port = l_port; m_key.fib_index = match_local->fib_index; kv.key = m_key.as_u64; if (clib_bihash_add_del_8_8 (&sm->static_mapping_by_local, &kv, 0)) nat_log_err ("static_mapping_by_local key del failed"); } if (sm->num_workers > 1) { ip4_header_t ip = { .src_address = local->addr, }; tsm = vec_elt_at_index (sm->per_thread_data, sm->worker_in2out_cb (&ip, m->fib_index)); } else tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); /* Delete sessions */ u_key.addr = match_local->addr; u_key.fib_index = match_local->fib_index; kv.key = u_key.as_u64; if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) { u = pool_elt_at_index (tsm->users, value.value); if (u->nstaticsessions) { head_index = u->sessions_per_user_list_head_index; head = pool_elt_at_index (tsm->list_pool, head_index); elt_index = head->next; elt = pool_elt_at_index (tsm->list_pool, elt_index); ses_index = elt->value; while (ses_index != ~0) { s = pool_elt_at_index (tsm->sessions, ses_index); elt = pool_elt_at_index (tsm->list_pool, elt->next); ses_index = elt->value; if (!(is_lb_session (s))) continue; if ((s->in2out.addr.as_u32 != match_local->addr.as_u32) || (clib_net_to_host_u16 (s->in2out.port) != match_local->port)) continue; nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); nat44_delete_session (sm, s, tsm - sm->per_thread_data); } } } pool_put (m->locals, match_local); } vec_free (m->workers); /* *INDENT-OFF* */ pool_foreach (local, m->locals, ({ vec_add1 (locals, local - m->locals); if (sm->num_workers > 1) { ip4_header_t ip; ip.src_address.as_u32 = local->addr.as_u32, bitmap = clib_bitmap_set (bitmap, sm->worker_in2out_cb (&ip, local->fib_index), 1); } })); /* *INDENT-ON* */ ASSERT (vec_len (locals) > 1); local = pool_elt_at_index (m->locals, locals[0]); local->prefix = local->probability; for (i = 1; i < vec_len (locals); i++) { local = pool_elt_at_index (m->locals, locals[i]); prev_local = pool_elt_at_index (m->locals, locals[i - 1]); local->prefix = local->probability + prev_local->prefix; } /* Assign workers */ if (sm->num_workers > 1) { /* *INDENT-OFF* */ clib_bitmap_foreach (i, bitmap, ({ vec_add1(m->workers, i); })); /* *INDENT-ON* */ } return 0; } int snat_del_address (snat_main_t * sm, ip4_address_t addr, u8 delete_sm, u8 twice_nat) { snat_address_t *a = 0; snat_session_t *ses; u32 *ses_to_be_removed = 0, *ses_index; snat_main_per_thread_data_t *tsm; snat_static_mapping_t *m; snat_interface_t *interface; int i; snat_address_t *addresses = twice_nat ? sm->twice_nat_addresses : sm->addresses; /* Find SNAT address */ for (i = 0; i < vec_len (addresses); i++) { if (addresses[i].addr.as_u32 == addr.as_u32) { a = addresses + i; break; } } if (!a) return VNET_API_ERROR_NO_SUCH_ENTRY; if (delete_sm) { /* *INDENT-OFF* */ pool_foreach (m, sm->static_mappings, ({ if (m->external_addr.as_u32 == addr.as_u32) (void) snat_add_static_mapping (m->local_addr, m->external_addr, m->local_port, m->external_port, m->vrf_id, is_addr_only_static_mapping(m), ~0, m->proto, 0, m->twice_nat, is_out2in_only_static_mapping(m), m->tag, is_identity_static_mapping(m)); })); /* *INDENT-ON* */ } else { /* Check if address is used in some static mapping */ if (is_snat_address_used_in_static_mapping (sm, addr)) { nat_log_notice ("address used in static mapping"); return VNET_API_ERROR_UNSPECIFIED; } } if (a->fib_index != ~0) fib_table_unlock (a->fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_LOW); /* Delete sessions using address */ if (a->busy_tcp_ports || a->busy_udp_ports || a->busy_icmp_ports) { /* *INDENT-OFF* */ vec_foreach (tsm, sm->per_thread_data) { pool_foreach (ses, tsm->sessions, ({ if (ses->out2in.addr.as_u32 == addr.as_u32) { nat_free_session_data (sm, ses, tsm - sm->per_thread_data, 0); vec_add1 (ses_to_be_removed, ses - tsm->sessions); } })); vec_foreach (ses_index, ses_to_be_removed) { ses = pool_elt_at_index (tsm->sessions, ses_index[0]); nat44_delete_session (sm, ses, tsm - sm->per_thread_data); } vec_free (ses_to_be_removed); } /* *INDENT-ON* */ } #define _(N, i, n, s) \ clib_bitmap_free (a->busy_##n##_port_bitmap); \ vec_free (a->busy_##n##_ports_per_thread); foreach_snat_protocol #undef _ if (twice_nat) { vec_del1 (sm->twice_nat_addresses, i); return 0; } else vec_del1 (sm->addresses, i); /* Delete external address from FIB */ /* *INDENT-OFF* */ pool_foreach (interface, sm->interfaces, ({ if (nat_interface_is_inside(interface) || sm->out2in_dpo) continue; snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0); break; })); pool_foreach (interface, sm->output_feature_interfaces, ({ if (nat_interface_is_inside(interface) || sm->out2in_dpo) continue; snat_add_del_addr_to_fib(&addr, 32, interface->sw_if_index, 0); break; })); /* *INDENT-ON* */ return 0; } int snat_interface_add_del (u32 sw_if_index, u8 is_inside, int is_del) { snat_main_t *sm = &snat_main; snat_interface_t *i; const char *feature_name, *del_feature_name; snat_address_t *ap; snat_static_mapping_t *m; snat_det_map_t *dm; nat_outside_fib_t *outside_fib; u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index); if (sm->out2in_dpo && !is_inside) return VNET_API_ERROR_UNSUPPORTED; /* *INDENT-OFF* */ pool_foreach (i, sm->output_feature_interfaces, ({ if (i->sw_if_index == sw_if_index) return VNET_API_ERROR_VALUE_EXIST; })); /* *INDENT-ON* */ if (sm->static_mapping_only && !(sm->static_mapping_connection_tracking)) feature_name = is_inside ? "nat44-in2out-fast" : "nat44-out2in-fast"; else { if (sm->num_workers > 1 && !sm->deterministic) feature_name = is_inside ? "nat44-in2out-worker-handoff" : "nat44-out2in-worker-handoff"; else if (sm->deterministic) feature_name = is_inside ? "nat44-det-in2out" : "nat44-det-out2in"; else if (sm->endpoint_dependent) feature_name = is_inside ? "nat44-ed-in2out" : "nat44-ed-out2in"; else feature_name = is_inside ? "nat44-in2out" : "nat44-out2in"; } if (sm->fq_in2out_index == ~0 && !sm->deterministic && sm->num_workers > 1) sm->fq_in2out_index = vlib_frame_queue_main_init (sm->in2out_node_index, NAT_FQ_NELTS); if (sm->fq_out2in_index == ~0 && !sm->deterministic && sm->num_workers > 1) sm->fq_out2in_index = vlib_frame_queue_main_init (sm->out2in_node_index, NAT_FQ_NELTS); if (!is_inside) { /* *INDENT-OFF* */ vec_foreach (outside_fib, sm->outside_fibs) { if (outside_fib->fib_index == fib_index) { if (is_del) { outside_fib->refcount--; if (!outside_fib->refcount) vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs); } else outside_fib->refcount++; goto feature_set; } } /* *INDENT-ON* */ if (!is_del) { vec_add2 (sm->outside_fibs, outside_fib, 1); outside_fib->refcount = 1; outside_fib->fib_index = fib_index; } } feature_set: /* *INDENT-OFF* */ pool_foreach (i, sm->interfaces, ({ if (i->sw_if_index == sw_if_index) { if (is_del) { if (nat_interface_is_inside(i) && nat_interface_is_outside(i)) { if (is_inside) i->flags &= ~NAT_INTERFACE_FLAG_IS_INSIDE; else i->flags &= ~NAT_INTERFACE_FLAG_IS_OUTSIDE; if (sm->num_workers > 1 && !sm->deterministic) { del_feature_name = "nat44-handoff-classify"; feature_name = !is_inside ? "nat44-in2out-worker-handoff" : "nat44-out2in-worker-handoff"; } else if (sm->deterministic) { del_feature_name = "nat44-det-classify"; feature_name = !is_inside ? "nat44-det-in2out" : "nat44-det-out2in"; } else if (sm->endpoint_dependent) { del_feature_name = "nat44-ed-classify"; feature_name = !is_inside ? "nat44-ed-in2out" : "nat44-ed-out2in"; } else { del_feature_name = "nat44-classify"; feature_name = !is_inside ? "nat44-in2out" : "nat44-out2in"; } vnet_feature_enable_disable ("ip4-unicast", del_feature_name, sw_if_index, 0, 0, 0); vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 1, 0, 0); if (!is_inside) { if (sm->endpoint_dependent) vnet_feature_enable_disable ("ip4-local", "nat44-ed-hairpinning", sw_if_index, 1, 0, 0); else if (!sm->deterministic) vnet_feature_enable_disable ("ip4-local", "nat44-hairpinning", sw_if_index, 1, 0, 0); } } else { vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 0, 0, 0); pool_put (sm->interfaces, i); if (is_inside) { if (sm->endpoint_dependent) vnet_feature_enable_disable ("ip4-local", "nat44-ed-hairpinning", sw_if_index, 0, 0, 0); else if (!sm->deterministic) vnet_feature_enable_disable ("ip4-local", "nat44-hairpinning", sw_if_index, 0, 0, 0); } } } else { if ((nat_interface_is_inside(i) && is_inside) || (nat_interface_is_outside(i) && !is_inside)) return 0; if (sm->num_workers > 1 && !sm->deterministic) { del_feature_name = !is_inside ? "nat44-in2out-worker-handoff" : "nat44-out2in-worker-handoff"; feature_name = "nat44-handoff-classify"; } else if (sm->deterministic) { del_feature_name = !is_inside ? "nat44-det-in2out" : "nat44-det-out2in"; feature_name = "nat44-det-classify"; } else if (sm->endpoint_dependent) { del_feature_name = !is_inside ? "nat44-ed-in2out" : "nat44-ed-out2in"; feature_name = "nat44-ed-classify"; } else { del_feature_name = !is_inside ? "nat44-in2out" : "nat44-out2in"; feature_name = "nat44-classify"; } vnet_feature_enable_disable ("ip4-unicast", del_feature_name, sw_if_index, 0, 0, 0); vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 1, 0, 0); if (!is_inside) { if (sm->endpoint_dependent) vnet_feature_enable_disable ("ip4-local", "nat44-ed-hairpinning", sw_if_index, 0, 0, 0); else if (!sm->deterministic) vnet_feature_enable_disable ("ip4-local", "nat44-hairpinning", sw_if_index, 0, 0, 0); } goto set_flags; } goto fib; } })); /* *INDENT-ON* */ if (is_del) return VNET_API_ERROR_NO_SUCH_ENTRY; pool_get (sm->interfaces, i); i->sw_if_index = sw_if_index; i->flags = 0; vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 1, 0, 0); if (is_inside && !sm->out2in_dpo) { if (sm->endpoint_dependent) vnet_feature_enable_disable ("ip4-local", "nat44-ed-hairpinning", sw_if_index, 1, 0, 0); else if (!sm->deterministic) vnet_feature_enable_disable ("ip4-local", "nat44-hairpinning", sw_if_index, 1, 0, 0); } set_flags: if (is_inside) { i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE; return 0; } else i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE; /* Add/delete external addresses to FIB */ fib: /* *INDENT-OFF* */ vec_foreach (ap, sm->addresses) snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del); pool_foreach (m, sm->static_mappings, ({ if (!(is_addr_only_static_mapping(m)) || (m->local_addr.as_u32 == m->external_addr.as_u32)) continue; snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del); })); pool_foreach (dm, sm->det_maps, ({ snat_add_del_addr_to_fib(&dm->out_addr, dm->out_plen, sw_if_index, !is_del); })); /* *INDENT-ON* */ return 0; } int snat_interface_add_del_output_feature (u32 sw_if_index, u8 is_inside, int is_del) { snat_main_t *sm = &snat_main; snat_interface_t *i; snat_address_t *ap; snat_static_mapping_t *m; nat_outside_fib_t *outside_fib; u32 fib_index = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index); if (sm->deterministic || (sm->static_mapping_only && !(sm->static_mapping_connection_tracking))) return VNET_API_ERROR_UNSUPPORTED; /* *INDENT-OFF* */ pool_foreach (i, sm->interfaces, ({ if (i->sw_if_index == sw_if_index) return VNET_API_ERROR_VALUE_EXIST; })); /* *INDENT-ON* */ if (!is_inside) { /* *INDENT-OFF* */ vec_foreach (outside_fib, sm->outside_fibs) { if (outside_fib->fib_index == fib_index) { if (is_del) { outside_fib->refcount--; if (!outside_fib->refcount) vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs); } else outside_fib->refcount++; goto feature_set; } } /* *INDENT-ON* */ if (!is_del) { vec_add2 (sm->outside_fibs, outside_fib, 1); outside_fib->refcount = 1; outside_fib->fib_index = fib_index; } } feature_set: if (is_inside) { if (sm->endpoint_dependent) { vnet_feature_enable_disable ("ip4-unicast", "nat44-ed-hairpin-dst", sw_if_index, !is_del, 0, 0); vnet_feature_enable_disable ("ip4-output", "nat44-ed-hairpin-src", sw_if_index, !is_del, 0, 0); } else { vnet_feature_enable_disable ("ip4-unicast", "nat44-hairpin-dst", sw_if_index, !is_del, 0, 0); vnet_feature_enable_disable ("ip4-output", "nat44-hairpin-src", sw_if_index, !is_del, 0, 0); } goto fq; } if (sm->num_workers > 1) { vnet_feature_enable_disable ("ip4-unicast", "nat44-out2in-worker-handoff", sw_if_index, !is_del, 0, 0); vnet_feature_enable_disable ("ip4-output", "nat44-in2out-output-worker-handoff", sw_if_index, !is_del, 0, 0); } else { if (sm->endpoint_dependent) { vnet_feature_enable_disable ("ip4-unicast", "nat44-ed-out2in", sw_if_index, !is_del, 0, 0); vnet_feature_enable_disable ("ip4-output", "nat44-ed-in2out-output", sw_if_index, !is_del, 0, 0); } else { vnet_feature_enable_disable ("ip4-unicast", "nat44-out2in", sw_if_index, !is_del, 0, 0); vnet_feature_enable_disable ("ip4-output", "nat44-in2out-output", sw_if_index, !is_del, 0, 0); } } fq: if (sm->fq_in2out_output_index == ~0 && sm->num_workers > 1) sm->fq_in2out_output_index = vlib_frame_queue_main_init (sm->in2out_output_node_index, 0); if (sm->fq_out2in_index == ~0 && sm->num_workers > 1) sm->fq_out2in_index = vlib_frame_queue_main_init (sm->out2in_node_index, 0); /* *INDENT-OFF* */ pool_foreach (i, sm->output_feature_interfaces, ({ if (i->sw_if_index == sw_if_index) { if (is_del) pool_put (sm->output_feature_interfaces, i); else return VNET_API_ERROR_VALUE_EXIST; goto fib; } })); /* *INDENT-ON* */ if (is_del) return VNET_API_ERROR_NO_SUCH_ENTRY; pool_get (sm->output_feature_interfaces, i); i->sw_if_index = sw_if_index; i->flags = 0; if (is_inside) i->flags |= NAT_INTERFACE_FLAG_IS_INSIDE; else i->flags |= NAT_INTERFACE_FLAG_IS_OUTSIDE; /* Add/delete external addresses to FIB */ fib: if (is_inside) return 0; /* *INDENT-OFF* */ vec_foreach (ap, sm->addresses) snat_add_del_addr_to_fib(&ap->addr, 32, sw_if_index, !is_del); pool_foreach (m, sm->static_mappings, ({ if (!((is_addr_only_static_mapping(m))) || (m->local_addr.as_u32 == m->external_addr.as_u32)) continue; snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del); })); /* *INDENT-ON* */ return 0; } int snat_set_workers (uword * bitmap) { snat_main_t *sm = &snat_main; int i, j = 0; if (sm->num_workers < 2) return VNET_API_ERROR_FEATURE_DISABLED; if (clib_bitmap_last_set (bitmap) >= sm->num_workers) return VNET_API_ERROR_INVALID_WORKER; vec_free (sm->workers); /* *INDENT-OFF* */ clib_bitmap_foreach (i, bitmap, ({ vec_add1(sm->workers, i); sm->per_thread_data[sm->first_worker_index + i].snat_thread_index = j; j++; })); /* *INDENT-ON* */ sm->port_per_thread = (0xffff - 1024) / _vec_len (sm->workers); sm->num_snat_thread = _vec_len (sm->workers); return 0; } static void snat_update_outside_fib (u32 sw_if_index, u32 new_fib_index, u32 old_fib_index) { snat_main_t *sm = &snat_main; nat_outside_fib_t *outside_fib; snat_interface_t *i; u8 is_add = 1; if (new_fib_index == old_fib_index) return; if (!vec_len (sm->outside_fibs)) return; pool_foreach (i, sm->interfaces, ( { if (i->sw_if_index == sw_if_index) { if (!(nat_interface_is_outside (i))) return;} } )); vec_foreach (outside_fib, sm->outside_fibs) { if (outside_fib->fib_index == old_fib_index) { outside_fib->refcount--; if (!outside_fib->refcount) vec_del1 (sm->outside_fibs, outside_fib - sm->outside_fibs); break; } } vec_foreach (outside_fib, sm->outside_fibs) { if (outside_fib->fib_index == new_fib_index) { outside_fib->refcount++; is_add = 0; break; } } if (is_add) { vec_add2 (sm->outside_fibs, outside_fib, 1); outside_fib->refcount = 1; outside_fib->fib_index = new_fib_index; } } static void snat_ip4_table_bind (ip4_main_t * im, uword opaque, u32 sw_if_index, u32 new_fib_index, u32 old_fib_index) { snat_update_outside_fib (sw_if_index, new_fib_index, old_fib_index); } static void snat_ip4_add_del_interface_address_cb (ip4_main_t * im, uword opaque, u32 sw_if_index, ip4_address_t * address, u32 address_length, u32 if_address_index, u32 is_delete); static void nat_ip4_add_del_addr_only_sm_cb (ip4_main_t * im, uword opaque, u32 sw_if_index, ip4_address_t * address, u32 address_length, u32 if_address_index, u32 is_delete); static int nat_alloc_addr_and_port_default (snat_address_t * addresses, u32 fib_index, u32 thread_index, snat_session_key_t * k, u16 port_per_thread, u32 snat_thread_index); static clib_error_t * snat_init (vlib_main_t * vm) { snat_main_t *sm = &snat_main; clib_error_t *error = 0; ip4_main_t *im = &ip4_main; ip_lookup_main_t *lm = &im->lookup_main; uword *p; vlib_thread_registration_t *tr; vlib_thread_main_t *tm = vlib_get_thread_main (); uword *bitmap = 0; u32 i; ip4_add_del_interface_address_callback_t cb4; vlib_node_t *node; sm->vlib_main = vm; sm->vnet_main = vnet_get_main (); sm->ip4_main = im; sm->ip4_lookup_main = lm; sm->api_main = &api_main; sm->first_worker_index = 0; sm->num_workers = 0; sm->num_snat_thread = 1; sm->workers = 0; sm->port_per_thread = 0xffff - 1024; sm->fq_in2out_index = ~0; sm->fq_in2out_output_index = ~0; sm->fq_out2in_index = ~0; sm->udp_timeout = SNAT_UDP_TIMEOUT; sm->tcp_established_timeout = SNAT_TCP_ESTABLISHED_TIMEOUT; sm->tcp_transitory_timeout = SNAT_TCP_TRANSITORY_TIMEOUT; sm->icmp_timeout = SNAT_ICMP_TIMEOUT; sm->alloc_addr_and_port = nat_alloc_addr_and_port_default; sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_DEFAULT; sm->forwarding_enabled = 0; sm->log_class = vlib_log_register_class ("nat", 0); sm->mss_clamping = 0; node = vlib_get_node_by_name (vm, (u8 *) "error-drop"); sm->error_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out"); sm->in2out_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-output"); sm->in2out_output_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-fast"); sm->in2out_fast_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-slowpath"); sm->in2out_slowpath_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-output-slowpath"); sm->in2out_slowpath_output_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-in2out-reass"); sm->in2out_reass_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out"); sm->ed_in2out_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out-slowpath"); sm->ed_in2out_slowpath_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-in2out-reass"); sm->ed_in2out_reass_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-out2in"); sm->out2in_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-out2in-fast"); sm->out2in_fast_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-out2in-reass"); sm->out2in_reass_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-out2in"); sm->ed_out2in_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-out2in-slowpath"); sm->ed_out2in_slowpath_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-out2in-reass"); sm->ed_out2in_reass_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-det-in2out"); sm->det_in2out_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-det-out2in"); sm->det_out2in_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-hairpinning"); sm->hairpinning_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-hairpin-dst"); sm->hairpin_dst_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-hairpin-src"); sm->hairpin_src_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-hairpinning"); sm->ed_hairpinning_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-hairpin-dst"); sm->ed_hairpin_dst_node_index = node->index; node = vlib_get_node_by_name (vm, (u8 *) "nat44-ed-hairpin-src"); sm->ed_hairpin_src_node_index = node->index; p = hash_get_mem (tm->thread_registrations_by_name, "workers"); if (p) { tr = (vlib_thread_registration_t *) p[0]; if (tr) { sm->num_workers = tr->count; sm->first_worker_index = tr->first_index; } } vec_validate (sm->per_thread_data, tm->n_vlib_mains - 1); /* Use all available workers by default */ if (sm->num_workers > 1) { for (i = 0; i < sm->num_workers; i++) bitmap = clib_bitmap_set (bitmap, i, 1); snat_set_workers (bitmap); clib_bitmap_free (bitmap); } else { sm->per_thread_data[0].snat_thread_index = 0; } error = snat_api_init (vm, sm); if (error) return error; /* Set up the interface address add/del callback */ cb4.function = snat_ip4_add_del_interface_address_cb; cb4.function_opaque = 0; vec_add1 (im->add_del_interface_address_callbacks, cb4); cb4.function = nat_ip4_add_del_addr_only_sm_cb; cb4.function_opaque = 0; vec_add1 (im->add_del_interface_address_callbacks, cb4); nat_dpo_module_init (); /* Init counters */ sm->total_users.name = "total-users"; sm->total_users.stat_segment_name = "/nat44/total-users"; vlib_validate_simple_counter (&sm->total_users, 0); vlib_zero_simple_counter (&sm->total_users, 0); sm->total_sessions.name = "total-sessions"; sm->total_sessions.stat_segment_name = "/nat44/total-sessions"; vlib_validate_simple_counter (&sm->total_sessions, 0); vlib_zero_simple_counter (&sm->total_sessions, 0); /* Init IPFIX logging */ snat_ipfix_logging_init (vm); /* Init NAT64 */ error = nat64_init (vm); if (error) return error; dslite_init (vm); nat66_init (vm); ip4_table_bind_callback_t cbt4 = { .function = snat_ip4_table_bind, }; vec_add1 (ip4_main.table_bind_callbacks, cbt4); /* Init virtual fragmenentation reassembly */ return nat_reass_init (vm); } VLIB_INIT_FUNCTION (snat_init); void snat_free_outside_address_and_port (snat_address_t * addresses, u32 thread_index, snat_session_key_t * k) { snat_address_t *a; u32 address_index; u16 port_host_byte_order = clib_net_to_host_u16 (k->port); for (address_index = 0; address_index < vec_len (addresses); address_index++) { if (addresses[address_index].addr.as_u32 == k->addr.as_u32) break; } ASSERT (address_index < vec_len (addresses)); a = addresses + address_index; switch (k->protocol) { #define _(N, i, n, s) \ case SNAT_PROTOCOL_##N: \ ASSERT (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, \ port_host_byte_order) == 1); \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, \ port_host_byte_order, 0); \ a->busy_##n##_ports--; \ a->busy_##n##_ports_per_thread[thread_index]--; \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return; } } static int nat_set_outside_address_and_port (snat_address_t * addresses, u32 thread_index, snat_session_key_t * k) { snat_address_t *a = 0; u32 address_index; u16 port_host_byte_order = clib_net_to_host_u16 (k->port); for (address_index = 0; address_index < vec_len (addresses); address_index++) { if (addresses[address_index].addr.as_u32 != k->addr.as_u32) continue; a = addresses + address_index; switch (k->protocol) { #define _(N, j, n, s) \ case SNAT_PROTOCOL_##N: \ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, port_host_byte_order)) \ return VNET_API_ERROR_INSTANCE_IN_USE; \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, port_host_byte_order, 1); \ a->busy_##n##_ports_per_thread[thread_index]++; \ a->busy_##n##_ports++; \ return 0; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return 1; } } return VNET_API_ERROR_NO_SUCH_ENTRY; } int snat_static_mapping_match (snat_main_t * sm, snat_session_key_t match, snat_session_key_t * mapping, u8 by_external, u8 * is_addr_only, twice_nat_type_t * twice_nat, lb_nat_type_t * lb, ip4_address_t * ext_host_addr, u8 * is_identity_nat) { clib_bihash_kv_8_8_t kv, value; snat_static_mapping_t *m; snat_session_key_t m_key; clib_bihash_8_8_t *mapping_hash = &sm->static_mapping_by_local; u32 rand, lo = 0, hi, mid, *tmp = 0, i; u8 backend_index; nat44_lb_addr_port_t *local; m_key.fib_index = match.fib_index; if (by_external) { mapping_hash = &sm->static_mapping_by_external; m_key.fib_index = 0; } m_key.addr = match.addr; m_key.port = clib_net_to_host_u16 (match.port); m_key.protocol = match.protocol; kv.key = m_key.as_u64; if (clib_bihash_search_8_8 (mapping_hash, &kv, &value)) { /* Try address only mapping */ m_key.port = 0; m_key.protocol = 0; kv.key = m_key.as_u64; if (clib_bihash_search_8_8 (mapping_hash, &kv, &value)) return 1; } m = pool_elt_at_index (sm->static_mappings, value.value); if (by_external) { if (is_lb_static_mapping (m)) { if (PREDICT_FALSE (lb != 0)) *lb = m->affinity ? AFFINITY_LB_NAT : LB_NAT; if (m->affinity) { if (nat_affinity_find_and_lock (ext_host_addr[0], match.addr, match.protocol, match.port, &backend_index)) goto get_local; local = pool_elt_at_index (m->locals, backend_index); mapping->addr = local->addr; mapping->port = clib_host_to_net_u16 (local->port); mapping->fib_index = local->fib_index; goto end; } get_local: /* *INDENT-OFF* */ pool_foreach_index (i, m->locals, ({ vec_add1 (tmp, i); })); /* *INDENT-ON* */ hi = vec_len (tmp) - 1; local = pool_elt_at_index (m->locals, tmp[hi]); rand = 1 + (random_u32 (&sm->random_seed) % local->prefix); while (lo < hi) { mid = ((hi - lo) >> 1) + lo; local = pool_elt_at_index (m->locals, tmp[mid]); (rand > local->prefix) ? (lo = mid + 1) : (hi = mid); } local = pool_elt_at_index (m->locals, tmp[lo]); if (!(local->prefix >= rand)) return 1; if (PREDICT_FALSE (sm->num_workers > 1)) { ip4_header_t ip = { .src_address = local->addr, }; if (sm->worker_in2out_cb (&ip, m->fib_index) != vlib_get_thread_index ()) goto get_local; } mapping->addr = local->addr; mapping->port = clib_host_to_net_u16 (local->port); mapping->fib_index = local->fib_index; if (m->affinity) { if (nat_affinity_create_and_lock (ext_host_addr[0], match.addr, match.protocol, match.port, tmp[lo], m->affinity, m->affinity_per_service_list_head_index)) nat_log_info ("create affinity record failed"); } vec_free (tmp); } else { if (PREDICT_FALSE (lb != 0)) *lb = NO_LB_NAT; mapping->fib_index = m->fib_index; mapping->addr = m->local_addr; /* Address only mapping doesn't change port */ mapping->port = is_addr_only_static_mapping (m) ? match.port : clib_host_to_net_u16 (m->local_port); } mapping->protocol = m->proto; } else { mapping->addr = m->external_addr; /* Address only mapping doesn't change port */ mapping->port = is_addr_only_static_mapping (m) ? match.port : clib_host_to_net_u16 (m->external_port); mapping->fib_index = sm->outside_fib_index; } end: if (PREDICT_FALSE (is_addr_only != 0)) *is_addr_only = is_addr_only_static_mapping (m); if (PREDICT_FALSE (twice_nat != 0)) *twice_nat = m->twice_nat; if (PREDICT_FALSE (is_identity_nat != 0)) *is_identity_nat = is_identity_static_mapping (m); return 0; } static_always_inline u16 snat_random_port (u16 min, u16 max) { snat_main_t *sm = &snat_main; return min + random_u32 (&sm->random_seed) / (random_u32_max () / (max - min + 1) + 1); } int snat_alloc_outside_address_and_port (snat_address_t * addresses, u32 fib_index, u32 thread_index, snat_session_key_t * k, u16 port_per_thread, u32 snat_thread_index) { snat_main_t *sm = &snat_main; return sm->alloc_addr_and_port (addresses, fib_index, thread_index, k, port_per_thread, snat_thread_index); } static int nat_alloc_addr_and_port_default (snat_address_t * addresses, u32 fib_index, u32 thread_index, snat_session_key_t * k, u16 port_per_thread, u32 snat_thread_index) { int i; snat_address_t *a, *ga = 0; u32 portnum; for (i = 0; i < vec_len (addresses); i++) { a = addresses + i; switch (k->protocol) { #define _(N, j, n, s) \ case SNAT_PROTOCOL_##N: \ if (a->busy_##n##_ports_per_thread[thread_index] < port_per_thread) \ { \ if (a->fib_index == fib_index) \ { \ while (1) \ { \ portnum = (port_per_thread * \ snat_thread_index) + \ snat_random_port(1, port_per_thread) + 1024; \ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \ continue; \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \ a->busy_##n##_ports_per_thread[thread_index]++; \ a->busy_##n##_ports++; \ k->addr = a->addr; \ k->port = clib_host_to_net_u16(portnum); \ return 0; \ } \ } \ else if (a->fib_index == ~0) \ { \ ga = a; \ } \ } \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return 1; } } if (ga) { a = ga; switch (k->protocol) { #define _(N, j, n, s) \ case SNAT_PROTOCOL_##N: \ while (1) \ { \ portnum = (port_per_thread * \ snat_thread_index) + \ snat_random_port(1, port_per_thread) + 1024; \ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \ continue; \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \ a->busy_##n##_ports_per_thread[thread_index]++; \ a->busy_##n##_ports++; \ k->addr = a->addr; \ k->port = clib_host_to_net_u16(portnum); \ return 0; \ } break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return 1; } } /* Totally out of translations to use... */ snat_ipfix_logging_addresses_exhausted (thread_index, 0); return 1; } static int nat_alloc_addr_and_port_mape (snat_address_t * addresses, u32 fib_index, u32 thread_index, snat_session_key_t * k, u16 port_per_thread, u32 snat_thread_index) { snat_main_t *sm = &snat_main; snat_address_t *a = addresses; u16 m, ports, portnum, A, j; m = 16 - (sm->psid_offset + sm->psid_length); ports = (1 << (16 - sm->psid_length)) - (1 << m); if (!vec_len (addresses)) goto exhausted; switch (k->protocol) { #define _(N, i, n, s) \ case SNAT_PROTOCOL_##N: \ if (a->busy_##n##_ports < ports) \ { \ while (1) \ { \ A = snat_random_port(1, pow2_mask(sm->psid_offset)); \ j = snat_random_port(0, pow2_mask(m)); \ portnum = A | (sm->psid << sm->psid_offset) | (j << (16 - m)); \ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \ continue; \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \ a->busy_##n##_ports++; \ k->addr = a->addr; \ k->port = clib_host_to_net_u16 (portnum); \ return 0; \ } \ } \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return 1; } exhausted: /* Totally out of translations to use... */ snat_ipfix_logging_addresses_exhausted (thread_index, 0); return 1; } static int nat_alloc_addr_and_port_range (snat_address_t * addresses, u32 fib_index, u32 thread_index, snat_session_key_t * k, u16 port_per_thread, u32 snat_thread_index) { snat_main_t *sm = &snat_main; snat_address_t *a = addresses; u16 portnum, ports; ports = sm->end_port - sm->start_port + 1; if (!vec_len (addresses)) goto exhausted; switch (k->protocol) { #define _(N, i, n, s) \ case SNAT_PROTOCOL_##N: \ if (a->busy_##n##_ports < ports) \ { \ while (1) \ { \ portnum = snat_random_port(sm->start_port, sm->end_port); \ if (clib_bitmap_get_no_check (a->busy_##n##_port_bitmap, portnum)) \ continue; \ clib_bitmap_set_no_check (a->busy_##n##_port_bitmap, portnum, 1); \ a->busy_##n##_ports++; \ k->addr = a->addr; \ k->port = clib_host_to_net_u16 (portnum); \ return 0; \ } \ } \ break; foreach_snat_protocol #undef _ default: nat_log_info ("unknown protocol"); return 1; } exhausted: /* Totally out of translations to use... */ snat_ipfix_logging_addresses_exhausted (thread_index, 0); return 1; } void nat44_add_del_address_dpo (ip4_address_t addr, u8 is_add) { dpo_id_t dpo_v4 = DPO_INVALID; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = 32, .fp_addr.ip4.as_u32 = addr.as_u32, }; if (is_add) { nat_dpo_create (DPO_PROTO_IP4, 0, &dpo_v4); fib_table_entry_special_dpo_add (0, &pfx, FIB_SOURCE_PLUGIN_HI, FIB_ENTRY_FLAG_EXCLUSIVE, &dpo_v4); dpo_reset (&dpo_v4); } else { fib_table_entry_special_remove (0, &pfx, FIB_SOURCE_PLUGIN_HI); } } u8 * format_session_kvp (u8 * s, va_list * args) { clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *); snat_session_key_t k; k.as_u64 = v->key; s = format (s, "%U session-index %llu", format_snat_key, &k, v->value); return s; } u8 * format_static_mapping_kvp (u8 * s, va_list * args) { clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *); snat_session_key_t k; k.as_u64 = v->key; s = format (s, "%U static-mapping-index %llu", format_static_mapping_key, &k, v->value); return s; } u8 * format_user_kvp (u8 * s, va_list * args) { clib_bihash_kv_8_8_t *v = va_arg (*args, clib_bihash_kv_8_8_t *); snat_user_key_t k; k.as_u64 = v->key; s = format (s, "%U fib %d user-index %llu", format_ip4_address, &k.addr, k.fib_index, v->value); return s; } u8 * format_ed_session_kvp (u8 * s, va_list * args) { clib_bihash_kv_16_8_t *v = va_arg (*args, clib_bihash_kv_16_8_t *); nat_ed_ses_key_t k; k.as_u64[0] = v->key[0]; k.as_u64[1] = v->key[1]; s = format (s, "local %U:%d remote %U:%d proto %U fib %d session-index %llu", format_ip4_address, &k.l_addr, clib_net_to_host_u16 (k.l_port), format_ip4_address, &k.r_addr, clib_net_to_host_u16 (k.r_port), format_ip_protocol, k.proto, k.fib_index, v->value); return s; } static u32 snat_get_worker_in2out_cb (ip4_header_t * ip0, u32 rx_fib_index0) { snat_main_t *sm = &snat_main; u32 next_worker_index = 0; u32 hash; next_worker_index = sm->first_worker_index; hash = ip0->src_address.as_u32 + (ip0->src_address.as_u32 >> 8) + (ip0->src_address.as_u32 >> 16) + (ip0->src_address.as_u32 >> 24); if (PREDICT_TRUE (is_pow2 (_vec_len (sm->workers)))) next_worker_index += sm->workers[hash & (_vec_len (sm->workers) - 1)]; else next_worker_index += sm->workers[hash % _vec_len (sm->workers)]; return next_worker_index; } static u32 snat_get_worker_out2in_cb (ip4_header_t * ip0, u32 rx_fib_index0) { snat_main_t *sm = &snat_main; udp_header_t *udp; u16 port; snat_session_key_t m_key; clib_bihash_kv_8_8_t kv, value; snat_static_mapping_t *m; u32 proto; u32 next_worker_index = 0; /* first try static mappings without port */ if (PREDICT_FALSE (pool_elts (sm->static_mappings))) { m_key.addr = ip0->dst_address; m_key.port = 0; m_key.protocol = 0; m_key.fib_index = rx_fib_index0; kv.key = m_key.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) { m = pool_elt_at_index (sm->static_mappings, value.value); return m->workers[0]; } } proto = ip_proto_to_snat_proto (ip0->protocol); udp = ip4_next_header (ip0); port = udp->dst_port; if (PREDICT_FALSE (ip4_is_fragment (ip0))) { if (PREDICT_FALSE (nat_reass_is_drop_frag (0))) return vlib_get_thread_index (); nat_reass_ip4_t *reass; reass = nat_ip4_reass_find (ip0->src_address, ip0->dst_address, ip0->fragment_id, ip0->protocol); if (reass && (reass->thread_index != (u32) ~ 0)) return reass->thread_index; if (ip4_is_first_fragment (ip0)) { reass = nat_ip4_reass_create (ip0->src_address, ip0->dst_address, ip0->fragment_id, ip0->protocol); if (!reass) goto no_reass; if (PREDICT_FALSE (pool_elts (sm->static_mappings))) { m_key.addr = ip0->dst_address; m_key.port = clib_net_to_host_u16 (port); m_key.protocol = proto; m_key.fib_index = rx_fib_index0; kv.key = m_key.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) { m = pool_elt_at_index (sm->static_mappings, value.value); reass->thread_index = m->workers[0]; return reass->thread_index; } } reass->thread_index = sm->first_worker_index; reass->thread_index += sm->workers[(clib_net_to_host_u16 (port) - 1024) / sm->port_per_thread]; return reass->thread_index; } else return vlib_get_thread_index (); } no_reass: /* unknown protocol */ if (PREDICT_FALSE (proto == ~0)) { /* use current thread */ return vlib_get_thread_index (); } if (PREDICT_FALSE (ip0->protocol == IP_PROTOCOL_ICMP)) { icmp46_header_t *icmp = (icmp46_header_t *) udp; icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1); if (!icmp_is_error_message (icmp)) port = echo->identifier; else { ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1); proto = ip_proto_to_snat_proto (inner_ip->protocol); void *l4_header = ip4_next_header (inner_ip); switch (proto) { case SNAT_PROTOCOL_ICMP: icmp = (icmp46_header_t *) l4_header; echo = (icmp_echo_header_t *) (icmp + 1); port = echo->identifier; break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: port = ((tcp_udp_header_t *) l4_header)->src_port; break; default: return vlib_get_thread_index (); } } } /* try static mappings with port */ if (PREDICT_FALSE (pool_elts (sm->static_mappings))) { m_key.addr = ip0->dst_address; m_key.port = clib_net_to_host_u16 (port); m_key.protocol = proto; m_key.fib_index = rx_fib_index0; kv.key = m_key.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) { m = pool_elt_at_index (sm->static_mappings, value.value); return m->workers[0]; } } /* worker by outside port */ next_worker_index = sm->first_worker_index; next_worker_index += sm->workers[(clib_net_to_host_u16 (port) - 1024) / sm->port_per_thread]; return next_worker_index; } static u32 nat44_ed_get_worker_out2in_cb (ip4_header_t * ip, u32 rx_fib_index) { snat_main_t *sm = &snat_main; clib_bihash_kv_8_8_t kv, value; u32 proto, next_worker_index = 0; udp_header_t *udp; u16 port; snat_static_mapping_t *m; u32 hash; /* first try static mappings without port */ if (PREDICT_FALSE (pool_elts (sm->static_mappings))) { make_sm_kv (&kv, &ip->dst_address, 0, rx_fib_index, 0); if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) { m = pool_elt_at_index (sm->static_mappings, value.value); return m->workers[0]; } } proto = ip_proto_to_snat_proto (ip->protocol); /* unknown protocol */ if (PREDICT_FALSE (proto == ~0)) { /* use current thread */ return vlib_get_thread_index (); } udp = ip4_next_header (ip); port = udp->dst_port; if (PREDICT_FALSE (ip->protocol == IP_PROTOCOL_ICMP)) { icmp46_header_t *icmp = (icmp46_header_t *) udp; icmp_echo_header_t *echo = (icmp_echo_header_t *) (icmp + 1); if (!icmp_is_error_message (icmp)) port = echo->identifier; else { ip4_header_t *inner_ip = (ip4_header_t *) (echo + 1); proto = ip_proto_to_snat_proto (inner_ip->protocol); void *l4_header = ip4_next_header (inner_ip); switch (proto) { case SNAT_PROTOCOL_ICMP: icmp = (icmp46_header_t *) l4_header; echo = (icmp_echo_header_t *) (icmp + 1); port = echo->identifier; break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: port = ((tcp_udp_header_t *) l4_header)->src_port; break; default: return vlib_get_thread_index (); } } } /* try static mappings with port */ if (PREDICT_FALSE (pool_elts (sm->static_mappings))) { make_sm_kv (&kv, &ip->dst_address, proto, rx_fib_index, clib_net_to_host_u16 (port)); if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) { m = pool_elt_at_index (sm->static_mappings, value.value); if (!is_lb_static_mapping (m)) return m->workers[0]; hash = ip->src_address.as_u32 + (ip->src_address.as_u32 >> 8) + (ip->src_address.as_u32 >> 16) + (ip->src_address.as_u32 >> 24); if (PREDICT_TRUE (is_pow2 (_vec_len (m->workers)))) return m->workers[hash & (_vec_len (m->workers) - 1)]; else return m->workers[hash % _vec_len (m->workers)]; } } /* worker by outside port */ next_worker_index = sm->first_worker_index; next_worker_index += sm->workers[(clib_net_to_host_u16 (port) - 1024) / sm->port_per_thread]; return next_worker_index; } void nat_ha_sadd_cb (ip4_address_t * in_addr, u16 in_port, ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr, u16 eh_port, ip4_address_t * ehn_addr, u16 ehn_port, u8 proto, u32 fib_index, u16 flags, u32 thread_index) { snat_main_t *sm = &snat_main; snat_session_key_t key; snat_user_t *u; snat_session_t *s; clib_bihash_kv_8_8_t kv; f64 now = vlib_time_now (sm->vlib_main); nat_outside_fib_t *outside_fib; fib_node_index_t fei = FIB_NODE_INDEX_INVALID; snat_main_per_thread_data_t *tsm; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = 32, .fp_addr = { .ip4.as_u32 = eh_addr->as_u32, }, }; tsm = vec_elt_at_index (sm->per_thread_data, thread_index); key.addr.as_u32 = out_addr->as_u32; key.port = out_port; key.protocol = proto; if (!(flags & SNAT_SESSION_FLAG_STATIC_MAPPING)) { if (nat_set_outside_address_and_port (sm->addresses, thread_index, &key)) return; } u = nat_user_get_or_create (sm, in_addr, fib_index, thread_index); if (!u) return; s = nat_session_alloc_or_recycle (sm, u, thread_index, now); if (!s) return; s->last_heard = now; s->flags = flags; s->ext_host_addr.as_u32 = eh_addr->as_u32; s->ext_host_port = eh_port; user_session_increment (sm, u, snat_is_session_static (s)); switch (vec_len (sm->outside_fibs)) { case 0: key.fib_index = sm->outside_fib_index; break; case 1: key.fib_index = sm->outside_fibs[0].fib_index; break; default: /* *INDENT-OFF* */ vec_foreach (outside_fib, sm->outside_fibs) { fei = fib_table_lookup (outside_fib->fib_index, &pfx); if (FIB_NODE_INDEX_INVALID != fei) { if (fib_entry_get_resolving_interface (fei) != ~0) { key.fib_index = outside_fib->fib_index; break; } } } /* *INDENT-ON* */ break; } s->out2in = key; kv.key = key.as_u64; kv.value = s - tsm->sessions; if (clib_bihash_add_del_8_8 (&tsm->out2in, &kv, 1)) nat_log_warn ("out2in key add failed"); key.addr.as_u32 = in_addr->as_u32; key.port = in_port; key.fib_index = fib_index; s->in2out = key; kv.key = key.as_u64; if (clib_bihash_add_del_8_8 (&tsm->in2out, &kv, 1)) nat_log_warn ("in2out key add failed"); } void nat_ha_sdel_cb (ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index, u32 ti) { snat_main_t *sm = &snat_main; snat_session_key_t key; clib_bihash_kv_8_8_t kv, value; u32 thread_index; snat_session_t *s; snat_main_per_thread_data_t *tsm; if (sm->num_workers > 1) thread_index = sm->first_worker_index + (sm->workers[(clib_net_to_host_u16 (out_port) - 1024) / sm->port_per_thread]); else thread_index = sm->num_workers; tsm = vec_elt_at_index (sm->per_thread_data, thread_index); key.addr.as_u32 = out_addr->as_u32; key.port = out_port; key.protocol = proto; key.fib_index = fib_index; kv.key = key.as_u64; if (clib_bihash_search_8_8 (&tsm->out2in, &kv, &value)) return; s = pool_elt_at_index (tsm->sessions, value.value); nat_free_session_data (sm, s, thread_index, 1); nat44_delete_session (sm, s, thread_index); } void nat_ha_sref_cb (ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index, u32 total_pkts, u64 total_bytes, u32 thread_index) { snat_main_t *sm = &snat_main; snat_session_key_t key; clib_bihash_kv_8_8_t kv, value; snat_session_t *s; snat_main_per_thread_data_t *tsm; tsm = vec_elt_at_index (sm->per_thread_data, thread_index); key.addr.as_u32 = out_addr->as_u32; key.port = out_port; key.protocol = proto; key.fib_index = fib_index; kv.key = key.as_u64; if (clib_bihash_search_8_8 (&tsm->out2in, &kv, &value)) return; s = pool_elt_at_index (tsm->sessions, value.value); s->total_pkts = total_pkts; s->total_bytes = total_bytes; } void nat_ha_sadd_ed_cb (ip4_address_t * in_addr, u16 in_port, ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr, u16 eh_port, ip4_address_t * ehn_addr, u16 ehn_port, u8 proto, u32 fib_index, u16 flags, u32 thread_index) { snat_main_t *sm = &snat_main; snat_session_key_t key; snat_user_t *u; snat_session_t *s; clib_bihash_kv_16_8_t kv; f64 now = vlib_time_now (sm->vlib_main); nat_outside_fib_t *outside_fib; fib_node_index_t fei = FIB_NODE_INDEX_INVALID; snat_main_per_thread_data_t *tsm; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = 32, .fp_addr = { .ip4.as_u32 = eh_addr->as_u32, }, }; tsm = vec_elt_at_index (sm->per_thread_data, thread_index); key.addr.as_u32 = out_addr->as_u32; key.port = out_port; key.protocol = proto; if (!(flags & SNAT_SESSION_FLAG_STATIC_MAPPING)) { if (nat_set_outside_address_and_port (sm->addresses, thread_index, &key)) return; } key.addr.as_u32 = ehn_addr->as_u32; key.port = ehn_port; if (flags & SNAT_SESSION_FLAG_TWICE_NAT) { if (nat_set_outside_address_and_port (sm->twice_nat_addresses, thread_index, &key)) return; } u = nat_user_get_or_create (sm, in_addr, fib_index, thread_index); if (!u) return; s = nat_ed_session_alloc (sm, u, thread_index, now); if (!s) return; s->last_heard = now; s->flags = flags; s->ext_host_nat_addr.as_u32 = s->ext_host_addr.as_u32 = eh_addr->as_u32; s->ext_host_nat_port = s->ext_host_port = eh_port; if (is_twice_nat_session (s)) { s->ext_host_nat_addr.as_u32 = ehn_addr->as_u32; s->ext_host_nat_port = ehn_port; } user_session_increment (sm, u, snat_is_session_static (s)); switch (vec_len (sm->outside_fibs)) { case 0: key.fib_index = sm->outside_fib_index; break; case 1: key.fib_index = sm->outside_fibs[0].fib_index; break; default: /* *INDENT-OFF* */ vec_foreach (outside_fib, sm->outside_fibs) { fei = fib_table_lookup (outside_fib->fib_index, &pfx); if (FIB_NODE_INDEX_INVALID != fei) { if (fib_entry_get_resolving_interface (fei) != ~0) { key.fib_index = outside_fib->fib_index; break; } } } /* *INDENT-ON* */ break; } key.addr.as_u32 = out_addr->as_u32; key.port = out_port; s->out2in = key; kv.value = s - tsm->sessions; key.addr.as_u32 = in_addr->as_u32; key.port = in_port; key.fib_index = fib_index; s->in2out = key; make_ed_kv (&kv, in_addr, &s->ext_host_nat_addr, snat_proto_to_ip_proto (proto), fib_index, in_port, s->ext_host_nat_port); if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &kv, 1)) nat_log_warn ("in2out key add failed"); make_ed_kv (&kv, out_addr, eh_addr, snat_proto_to_ip_proto (proto), s->out2in.fib_index, out_port, eh_port); if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &kv, 1)) nat_log_warn ("out2in key add failed"); } void nat_ha_sdel_ed_cb (ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index, u32 ti) { snat_main_t *sm = &snat_main; nat_ed_ses_key_t key; clib_bihash_kv_16_8_t kv, value; u32 thread_index; snat_session_t *s; snat_main_per_thread_data_t *tsm; if (sm->num_workers > 1) thread_index = sm->first_worker_index + (sm->workers[(clib_net_to_host_u16 (out_port) - 1024) / sm->port_per_thread]); else thread_index = sm->num_workers; tsm = vec_elt_at_index (sm->per_thread_data, thread_index); key.l_addr.as_u32 = out_addr->as_u32; key.l_port = out_port; key.r_addr.as_u32 = eh_addr->as_u32; key.r_port = eh_port; key.proto = proto; key.fib_index = fib_index; kv.key[0] = key.as_u64[0]; kv.key[1] = key.as_u64[1]; if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value)) return; s = pool_elt_at_index (tsm->sessions, value.value); nat_free_session_data (sm, s, thread_index, 1); nat44_delete_session (sm, s, thread_index); } void nat_ha_sref_ed_cb (ip4_address_t * out_addr, u16 out_port, ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 fib_index, u32 total_pkts, u64 total_bytes, u32 thread_index) { snat_main_t *sm = &snat_main; nat_ed_ses_key_t key; clib_bihash_kv_16_8_t kv, value; snat_session_t *s; snat_main_per_thread_data_t *tsm; tsm = vec_elt_at_index (sm->per_thread_data, thread_index); key.l_addr.as_u32 = out_addr->as_u32; key.l_port = out_port; key.r_addr.as_u32 = eh_addr->as_u32; key.r_port = eh_port; key.proto = proto; key.fib_index = fib_index; kv.key[0] = key.as_u64[0]; kv.key[1] = key.as_u64[1]; if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value)) return; s = pool_elt_at_index (tsm->sessions, value.value); s->total_pkts = total_pkts; s->total_bytes = total_bytes; } static clib_error_t * snat_config (vlib_main_t * vm, unformat_input_t * input) { snat_main_t *sm = &snat_main; nat66_main_t *nm = &nat66_main; u32 translation_buckets = 1024; u32 translation_memory_size = 128 << 20; u32 user_buckets = 128; u32 user_memory_size = 64 << 20; u32 max_translations_per_user = 100; u32 outside_vrf_id = 0; u32 outside_ip6_vrf_id = 0; u32 inside_vrf_id = 0; u32 static_mapping_buckets = 1024; u32 static_mapping_memory_size = 64 << 20; u32 nat64_bib_buckets = 1024; u32 nat64_bib_memory_size = 128 << 20; u32 nat64_st_buckets = 2048; u32 nat64_st_memory_size = 256 << 20; u8 static_mapping_only = 0; u8 static_mapping_connection_tracking = 0; snat_main_per_thread_data_t *tsm; dslite_main_t *dm = &dslite_main; sm->deterministic = 0; sm->out2in_dpo = 0; sm->endpoint_dependent = 0; while (unformat_check_input (input) != UNFORMAT_END_OF_INPUT) { if (unformat (input, "translation hash buckets %d", &translation_buckets)) ; else if (unformat (input, "translation hash memory %d", &translation_memory_size)); else if (unformat (input, "user hash buckets %d", &user_buckets)) ; else if (unformat (input, "user hash memory %d", &user_memory_size)) ; else if (unformat (input, "max translations per user %d", &max_translations_per_user)) ; else if (unformat (input, "outside VRF id %d", &outside_vrf_id)) ; else if (unformat (input, "outside ip6 VRF id %d", &outside_ip6_vrf_id)) ; else if (unformat (input, "inside VRF id %d", &inside_vrf_id)) ; else if (unformat (input, "static mapping only")) { static_mapping_only = 1; if (unformat (input, "connection tracking")) static_mapping_connection_tracking = 1; } else if (unformat (input, "deterministic")) sm->deterministic = 1; else if (unformat (input, "nat64 bib hash buckets %d", &nat64_bib_buckets)) ; else if (unformat (input, "nat64 bib hash memory %d", &nat64_bib_memory_size)) ; else if (unformat (input, "nat64 st hash buckets %d", &nat64_st_buckets)) ; else if (unformat (input, "nat64 st hash memory %d", &nat64_st_memory_size)) ; else if (unformat (input, "out2in dpo")) sm->out2in_dpo = 1; else if (unformat (input, "dslite ce")) dslite_set_ce (dm, 1); else if (unformat (input, "endpoint-dependent")) sm->endpoint_dependent = 1; else return clib_error_return (0, "unknown input '%U'", format_unformat_error, input); } if (sm->deterministic && sm->endpoint_dependent) return clib_error_return (0, "deterministic and endpoint-dependent modes are mutually exclusive"); if (static_mapping_only && (sm->deterministic || sm->endpoint_dependent)) return clib_error_return (0, "static mapping only mode available only for simple nat"); if (sm->out2in_dpo && (sm->deterministic || sm->endpoint_dependent)) return clib_error_return (0, "out2in dpo mode available only for simple nat"); /* for show commands, etc. */ sm->translation_buckets = translation_buckets; sm->translation_memory_size = translation_memory_size; /* do not exceed load factor 10 */ sm->max_translations = 10 * translation_buckets; sm->user_buckets = user_buckets; sm->user_memory_size = user_memory_size; sm->max_translations_per_user = max_translations_per_user; sm->outside_vrf_id = outside_vrf_id; sm->outside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, outside_vrf_id, FIB_SOURCE_PLUGIN_HI); nm->outside_vrf_id = outside_ip6_vrf_id; nm->outside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP6, outside_ip6_vrf_id, FIB_SOURCE_PLUGIN_HI); sm->inside_vrf_id = inside_vrf_id; sm->inside_fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, inside_vrf_id, FIB_SOURCE_PLUGIN_HI); sm->static_mapping_only = static_mapping_only; sm->static_mapping_connection_tracking = static_mapping_connection_tracking; nat64_set_hash (nat64_bib_buckets, nat64_bib_memory_size, nat64_st_buckets, nat64_st_memory_size); if (sm->deterministic) { sm->in2out_node_index = snat_det_in2out_node.index; sm->in2out_output_node_index = ~0; sm->out2in_node_index = snat_det_out2in_node.index; sm->icmp_match_in2out_cb = icmp_match_in2out_det; sm->icmp_match_out2in_cb = icmp_match_out2in_det; } else { if (sm->endpoint_dependent) { sm->worker_in2out_cb = snat_get_worker_in2out_cb; sm->worker_out2in_cb = nat44_ed_get_worker_out2in_cb; sm->in2out_node_index = nat44_ed_in2out_node.index; sm->in2out_output_node_index = nat44_ed_in2out_output_node.index; sm->out2in_node_index = nat44_ed_out2in_node.index; sm->icmp_match_in2out_cb = icmp_match_in2out_ed; sm->icmp_match_out2in_cb = icmp_match_out2in_ed; nat_affinity_init (vm); nat_ha_init (vm, nat_ha_sadd_ed_cb, nat_ha_sdel_ed_cb, nat_ha_sref_ed_cb); } else { sm->worker_in2out_cb = snat_get_worker_in2out_cb; sm->worker_out2in_cb = snat_get_worker_out2in_cb; sm->in2out_node_index = snat_in2out_node.index; sm->in2out_output_node_index = snat_in2out_output_node.index; sm->out2in_node_index = snat_out2in_node.index; sm->icmp_match_in2out_cb = icmp_match_in2out_slow; sm->icmp_match_out2in_cb = icmp_match_out2in_slow; nat_ha_init (vm, nat_ha_sadd_cb, nat_ha_sdel_cb, nat_ha_sref_cb); } if (!static_mapping_only || (static_mapping_only && static_mapping_connection_tracking)) { /* *INDENT-OFF* */ vec_foreach (tsm, sm->per_thread_data) { if (sm->endpoint_dependent) { clib_bihash_init_16_8 (&tsm->in2out_ed, "in2out-ed", translation_buckets, translation_memory_size); clib_bihash_set_kvp_format_fn_16_8 (&tsm->in2out_ed, format_ed_session_kvp); clib_bihash_init_16_8 (&tsm->out2in_ed, "out2in-ed", translation_buckets, translation_memory_size); clib_bihash_set_kvp_format_fn_16_8 (&tsm->out2in_ed, format_ed_session_kvp); } else { clib_bihash_init_8_8 (&tsm->in2out, "in2out", translation_buckets, translation_memory_size); clib_bihash_set_kvp_format_fn_8_8 (&tsm->in2out, format_session_kvp); clib_bihash_init_8_8 (&tsm->out2in, "out2in", translation_buckets, translation_memory_size); clib_bihash_set_kvp_format_fn_8_8 (&tsm->out2in, format_session_kvp); } clib_bihash_init_8_8 (&tsm->user_hash, "users", user_buckets, user_memory_size); clib_bihash_set_kvp_format_fn_8_8 (&tsm->user_hash, format_user_kvp); } /* *INDENT-ON* */ } else { sm->icmp_match_in2out_cb = icmp_match_in2out_fast; sm->icmp_match_out2in_cb = icmp_match_out2in_fast; } clib_bihash_init_8_8 (&sm->static_mapping_by_local, "static_mapping_by_local", static_mapping_buckets, static_mapping_memory_size); clib_bihash_set_kvp_format_fn_8_8 (&sm->static_mapping_by_local, format_static_mapping_kvp); clib_bihash_init_8_8 (&sm->static_mapping_by_external, "static_mapping_by_external", static_mapping_buckets, static_mapping_memory_size); clib_bihash_set_kvp_format_fn_8_8 (&sm->static_mapping_by_external, format_static_mapping_kvp); } return 0; } VLIB_CONFIG_FUNCTION (snat_config, "nat"); static void nat_ip4_add_del_addr_only_sm_cb (ip4_main_t * im, uword opaque, u32 sw_if_index, ip4_address_t * address, u32 address_length, u32 if_address_index, u32 is_delete) { snat_main_t *sm = &snat_main; snat_static_map_resolve_t *rp; snat_static_mapping_t *m; snat_session_key_t m_key; clib_bihash_kv_8_8_t kv, value; int i, rv; ip4_address_t l_addr; for (i = 0; i < vec_len (sm->to_resolve); i++) { rp = sm->to_resolve + i; if (rp->addr_only == 0) continue; if (rp->sw_if_index == sw_if_index) goto match; } return; match: m_key.addr.as_u32 = address->as_u32; m_key.port = rp->addr_only ? 0 : rp->e_port; m_key.protocol = rp->addr_only ? 0 : rp->proto; m_key.fib_index = sm->outside_fib_index; kv.key = m_key.as_u64; if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) m = 0; else m = pool_elt_at_index (sm->static_mappings, value.value); if (!is_delete) { /* Don't trip over lease renewal, static config */ if (m) return; } else { if (!m) return; } /* Indetity mapping? */ if (rp->l_addr.as_u32 == 0) l_addr.as_u32 = address[0].as_u32; else l_addr.as_u32 = rp->l_addr.as_u32; /* Add the static mapping */ rv = snat_add_static_mapping (l_addr, address[0], rp->l_port, rp->e_port, rp->vrf_id, rp->addr_only, ~0 /* sw_if_index */ , rp->proto, !is_delete, rp->twice_nat, rp->out2in_only, rp->tag, rp->identity_nat); if (rv) nat_log_notice ("snat_add_static_mapping returned %d", rv); } static void snat_ip4_add_del_interface_address_cb (ip4_main_t * im, uword opaque, u32 sw_if_index, ip4_address_t * address, u32 address_length, u32 if_address_index, u32 is_delete) { snat_main_t *sm = &snat_main; snat_static_map_resolve_t *rp; ip4_address_t l_addr; int i, j; int rv; u8 twice_nat = 0; snat_address_t *addresses = sm->addresses; for (i = 0; i < vec_len (sm->auto_add_sw_if_indices); i++) { if (sw_if_index == sm->auto_add_sw_if_indices[i]) goto match; } for (i = 0; i < vec_len (sm->auto_add_sw_if_indices_twice_nat); i++) { twice_nat = 1; addresses = sm->twice_nat_addresses; if (sw_if_index == sm->auto_add_sw_if_indices_twice_nat[i]) goto match; } return; match: if (!is_delete) { /* Don't trip over lease renewal, static config */ for (j = 0; j < vec_len (addresses); j++) if (addresses[j].addr.as_u32 == address->as_u32) return; (void) snat_add_address (sm, address, ~0, twice_nat); /* Scan static map resolution vector */ for (j = 0; j < vec_len (sm->to_resolve); j++) { rp = sm->to_resolve + j; if (rp->addr_only) continue; /* On this interface? */ if (rp->sw_if_index == sw_if_index) { /* Indetity mapping? */ if (rp->l_addr.as_u32 == 0) l_addr.as_u32 = address[0].as_u32; else l_addr.as_u32 = rp->l_addr.as_u32; /* Add the static mapping */ rv = snat_add_static_mapping (l_addr, address[0], rp->l_port, rp->e_port, rp->vrf_id, rp->addr_only, ~0 /* sw_if_index */ , rp->proto, rp->is_add, rp->twice_nat, rp->out2in_only, rp->tag, rp->identity_nat); if (rv) nat_log_notice ("snat_add_static_mapping returned %d", rv); } } return; } else { (void) snat_del_address (sm, address[0], 1, twice_nat); return; } } int snat_add_interface_address (snat_main_t * sm, u32 sw_if_index, int is_del, u8 twice_nat) { ip4_main_t *ip4_main = sm->ip4_main; ip4_address_t *first_int_addr; snat_static_map_resolve_t *rp; u32 *indices_to_delete = 0; int i, j; u32 *auto_add_sw_if_indices = twice_nat ? sm-> auto_add_sw_if_indices_twice_nat : sm->auto_add_sw_if_indices; first_int_addr = ip4_interface_first_address (ip4_main, sw_if_index, 0 /* just want the address */ ); for (i = 0; i < vec_len (auto_add_sw_if_indices); i++) { if (auto_add_sw_if_indices[i] == sw_if_index) { if (is_del) { /* if have address remove it */ if (first_int_addr) (void) snat_del_address (sm, first_int_addr[0], 1, twice_nat); else { for (j = 0; j < vec_len (sm->to_resolve); j++) { rp = sm->to_resolve + j; if (rp->sw_if_index == sw_if_index) vec_add1 (indices_to_delete, j); } if (vec_len (indices_to_delete)) { for (j = vec_len (indices_to_delete) - 1; j >= 0; j--) vec_del1 (sm->to_resolve, j); vec_free (indices_to_delete); } } if (twice_nat) vec_del1 (sm->auto_add_sw_if_indices_twice_nat, i); else vec_del1 (sm->auto_add_sw_if_indices, i); } else return VNET_API_ERROR_VALUE_EXIST; return 0; } } if (is_del) return VNET_API_ERROR_NO_SUCH_ENTRY; /* add to the auto-address list */ if (twice_nat) vec_add1 (sm->auto_add_sw_if_indices_twice_nat, sw_if_index); else vec_add1 (sm->auto_add_sw_if_indices, sw_if_index); /* If the address is already bound - or static - add it now */ if (first_int_addr) (void) snat_add_address (sm, first_int_addr, ~0, twice_nat); return 0; } int nat44_del_session (snat_main_t * sm, ip4_address_t * addr, u16 port, snat_protocol_t proto, u32 vrf_id, int is_in) { snat_main_per_thread_data_t *tsm; clib_bihash_kv_8_8_t kv, value; ip4_header_t ip; u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id); snat_session_key_t key; snat_session_t *s; clib_bihash_8_8_t *t; if (sm->endpoint_dependent) return VNET_API_ERROR_UNSUPPORTED; ip.dst_address.as_u32 = ip.src_address.as_u32 = addr->as_u32; if (sm->num_workers > 1) tsm = vec_elt_at_index (sm->per_thread_data, sm->worker_in2out_cb (&ip, fib_index)); else tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); key.addr.as_u32 = addr->as_u32; key.port = clib_host_to_net_u16 (port); key.protocol = proto; key.fib_index = fib_index; kv.key = key.as_u64; t = is_in ? &tsm->in2out : &tsm->out2in; if (!clib_bihash_search_8_8 (t, &kv, &value)) { if (pool_is_free_index (tsm->sessions, value.value)) return VNET_API_ERROR_UNSPECIFIED; s = pool_elt_at_index (tsm->sessions, value.value); nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); nat44_delete_session (sm, s, tsm - sm->per_thread_data); return 0; } return VNET_API_ERROR_NO_SUCH_ENTRY; } int nat44_del_ed_session (snat_main_t * sm, ip4_address_t * addr, u16 port, ip4_address_t * eh_addr, u16 eh_port, u8 proto, u32 vrf_id, int is_in) { ip4_header_t ip; clib_bihash_16_8_t *t; nat_ed_ses_key_t key; clib_bihash_kv_16_8_t kv, value; u32 fib_index = fib_table_find (FIB_PROTOCOL_IP4, vrf_id); snat_session_t *s; snat_main_per_thread_data_t *tsm; if (!sm->endpoint_dependent) return VNET_API_ERROR_FEATURE_DISABLED; ip.dst_address.as_u32 = ip.src_address.as_u32 = addr->as_u32; if (sm->num_workers > 1) tsm = vec_elt_at_index (sm->per_thread_data, sm->worker_in2out_cb (&ip, fib_index)); else tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); t = is_in ? &tsm->in2out_ed : &tsm->out2in_ed; key.l_addr.as_u32 = addr->as_u32; key.r_addr.as_u32 = eh_addr->as_u32; key.l_port = clib_host_to_net_u16 (port); key.r_port = clib_host_to_net_u16 (eh_port); key.proto = proto; key.fib_index = fib_index; kv.key[0] = key.as_u64[0]; kv.key[1] = key.as_u64[1]; if (clib_bihash_search_16_8 (t, &kv, &value)) return VNET_API_ERROR_NO_SUCH_ENTRY; if (pool_is_free_index (tsm->sessions, value.value)) return VNET_API_ERROR_UNSPECIFIED; s = pool_elt_at_index (tsm->sessions, value.value); nat_free_session_data (sm, s, tsm - sm->per_thread_data, 0); nat44_delete_session (sm, s, tsm - sm->per_thread_data); return 0; } void nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset, u16 psid_length) { snat_main_t *sm = &snat_main; sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_MAPE; sm->alloc_addr_and_port = nat_alloc_addr_and_port_mape; sm->psid = psid; sm->psid_offset = psid_offset; sm->psid_length = psid_length; } void nat_set_alloc_addr_and_port_range (u16 start_port, u16 end_port) { snat_main_t *sm = &snat_main; sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_RANGE; sm->alloc_addr_and_port = nat_alloc_addr_and_port_range; sm->start_port = start_port; sm->end_port = end_port; } void nat_set_alloc_addr_and_port_default (void) { snat_main_t *sm = &snat_main; sm->addr_and_port_alloc_alg = NAT_ADDR_AND_PORT_ALLOC_ALG_DEFAULT; sm->alloc_addr_and_port = nat_alloc_addr_and_port_default; } /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */