/* * 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 <vnet/vnet.h> #include <vnet/ip/ip.h> #include <vnet/ip/ip4.h> #include <vnet/plugin/plugin.h> #include <nat/nat.h> #include <nat/nat_dpo.h> #include <nat/nat_ipfix_logging.h> #include <nat/nat_det.h> #include <nat/nat64.h> #include <nat/nat66.h> #include <nat/dslite.h> #include <nat/nat_reass.h> #include <vnet/fib/fib_table.h> #include <vnet/fib/ip4_fib.h> #include <vpp/app/version.h> snat_main_t snat_main; /* 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"), }; 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"), }; 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_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"), }; 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"), }; 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"), }; /* 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"), }; /* 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"), }; /* *INDENT-OFF* */ VLIB_PLUGIN_REGISTER () = { .version = VPP_BUILD_VER, .description = "Network Address Translation", }; /* *INDENT-ON* */ vlib_node_registration_t nat44_classify_node; vlib_node_registration_t nat44_det_classify_node; vlib_node_registration_t nat44_handoff_classify_node; typedef enum { NAT44_CLASSIFY_NEXT_IN2OUT, NAT44_CLASSIFY_NEXT_OUT2IN, NAT44_CLASSIFY_N_NEXT, } nat44_classify_next_t; void nat_free_session_data (snat_main_t * sm, snat_session_t * s, u32 thread_index) { 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; int i; snat_address_t *a; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, thread_index); /* Endpoint dependent session lookup tables */ if (is_ed_session (s)) { 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 (&sm->out2in_ed, &ed_kv, 0)) clib_warning ("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 (&sm->in2out_ed, &ed_kv, 0)) clib_warning ("in2out_ed key del failed"); } if (snat_is_unk_proto_session (s)) return; /* log NAT event */ snat_ipfix_logging_nat44_ses_delete(s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->in2out.protocol, s->in2out.port, s->out2in.port, s->in2out.fib_index); /* Twice NAT address and port for external host */ if (is_twice_nat_session (s)) { for (i = 0; i < vec_len (sm->twice_nat_addresses); i++) { key.protocol = s->in2out.protocol; key.port = s->ext_host_nat_port; a = sm->twice_nat_addresses + i; if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32) { snat_free_outside_address_and_port (sm->twice_nat_addresses, thread_index, &key, i); break; } } } if (is_ed_session (s)) return; /* Session lookup tables */ kv.key = s->in2out.as_u64; if (clib_bihash_add_del_8_8 (&tsm->in2out, &kv, 0)) clib_warning ("in2out key del failed"); kv.key = s->out2in.as_u64; if (clib_bihash_add_del_8_8 (&tsm->out2in, &kv, 0)) clib_warning ("out2in key del failed"); if (snat_is_session_static (s)) return; if (s->outside_address_index != ~0) snat_free_outside_address_and_port (sm->addresses, thread_index, &s->out2in, s->outside_address_index); } 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); 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)) clib_warning ("user_hash keay add failed"); } 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) { 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); s->outside_address_index = ~0; s->flags = 0; s->total_bytes = 0; s->total_pkts = 0; } else { pool_get (tsm->sessions, s); memset (s, 0, sizeof (*s)); s->outside_address_index = ~0; /* 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); } return s; } static inline uword nat44_classify_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; nat44_classify_next_t next_index; snat_main_t *sm = &snat_main; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0 = NAT44_CLASSIFY_NEXT_IN2OUT; ip4_header_t *ip0; snat_address_t *ap; snat_session_key_t m_key0; clib_bihash_kv_8_8_t kv0, value0; /* speculatively enqueue b0 to the current next frame */ bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); ip0 = vlib_buffer_get_current (b0); vec_foreach (ap, sm->addresses) { if (ip0->dst_address.as_u32 == ap->addr.as_u32) { next0 = NAT44_CLASSIFY_NEXT_OUT2IN; goto enqueue0; } } if (PREDICT_FALSE (pool_elts (sm->static_mappings))) { m_key0.addr = ip0->dst_address; m_key0.port = 0; m_key0.protocol = 0; m_key0.fib_index = sm->outside_fib_index; kv0.key = m_key0.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv0, &value0)) { next0 = NAT44_CLASSIFY_NEXT_OUT2IN; goto enqueue0; } udp_header_t * udp0 = ip4_next_header (ip0); m_key0.port = clib_net_to_host_u16 (udp0->dst_port); m_key0.protocol = ip_proto_to_snat_proto (ip0->protocol); kv0.key = m_key0.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv0, &value0)) next0 = NAT44_CLASSIFY_NEXT_OUT2IN; } enqueue0: /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return frame->n_vectors; } static uword nat44_classify_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_classify_node_fn_inline (vm, node, frame); }; VLIB_REGISTER_NODE (nat44_classify_node) = { .function = nat44_classify_node_fn, .name = "nat44-classify", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_next_nodes = NAT44_CLASSIFY_N_NEXT, .next_nodes = { [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-in2out", [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-out2in", }, }; VLIB_NODE_FUNCTION_MULTIARCH (nat44_classify_node, nat44_classify_node_fn); static uword nat44_det_classify_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_classify_node_fn_inline (vm, node, frame); }; VLIB_REGISTER_NODE (nat44_det_classify_node) = { .function = nat44_det_classify_node_fn, .name = "nat44-det-classify", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_next_nodes = NAT44_CLASSIFY_N_NEXT, .next_nodes = { [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-det-in2out", [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-det-out2in", }, }; VLIB_NODE_FUNCTION_MULTIARCH (nat44_det_classify_node, nat44_det_classify_node_fn); static uword nat44_handoff_classify_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_classify_node_fn_inline (vm, node, frame); }; VLIB_REGISTER_NODE (nat44_handoff_classify_node) = { .function = nat44_handoff_classify_node_fn, .name = "nat44-handoff-classify", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_next_nodes = NAT44_CLASSIFY_N_NEXT, .next_nodes = { [NAT44_CLASSIFY_NEXT_IN2OUT] = "nat44-in2out-worker-handoff", [NAT44_CLASSIFY_NEXT_OUT2IN] = "nat44-out2in-worker-handoff", }, }; VLIB_NODE_FUNCTION_MULTIARCH (nat44_handoff_classify_node, nat44_handoff_classify_node_fn); /** * @brief Add/del NAT address to FIB. * * Add the external NAT address to the FIB as receive entries. This ensures * that VPP will reply to ARP for this address and we don't need to enable * proxy ARP on the outside interface. * * @param addr IPv4 address. * @param plen address prefix length * @param sw_if_index Interface. * @param is_add If 0 delete, otherwise add. */ 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_HI, (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_HI); } void 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 (); /* Check if address already exists */ vec_foreach (ap, twice_nat ? sm->twice_nat_addresses : sm->addresses) { if (ap->addr.as_u32 == addr->as_u32) return; } 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_HI); else ap->fib_index = ~0; #define _(N, i, n, s) \ clib_bitmap_alloc (ap->busy_##n##_port_bitmap, 65535); \ ap->busy_##n##_ports = 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; /* Add external address to FIB */ 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; })); } static int is_snat_address_used_in_static_mapping (snat_main_t *sm, ip4_address_t addr) { snat_static_mapping_t *m; pool_foreach (m, sm->static_mappings, ({ if (m->external_addr.as_u32 == addr.as_u32) return 1; })); 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) { 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->tag = vec_dup (tag); } /** * @brief Add static mapping. * * Create static mapping between local addr+port and external addr+port. * * @param l_addr Local IPv4 address. * @param e_addr External IPv4 address. * @param l_port Local port number. * @param e_port External port number. * @param vrf_id VRF ID. * @param addr_only If 0 address port and pair mapping, otherwise address only. * @param sw_if_index External port instead of specific IP address. * @param is_add If 0 delete static mapping, otherwise add. * @param twice_nat If 1 translate external host address and port. * @param out2in_only If 1 rule match only out2in direction * @param tag - opaque string tag * * @returns */ 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, u8 twice_nat, u8 out2in_only, u8 * tag) { 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; uword * p; 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; /* If the external address is a specific interface address */ if (sw_if_index != ~0) { ip4_address_t * first_int_addr; snat_static_map_resolve_t *rp, *rp_match = 0; 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; /* DHCP resolution required? */ if (first_int_addr == 0) { snat_add_static_mapping_when_resolved (sm, l_addr, l_port, sw_if_index, e_port, vrf_id, proto, addr_only, is_add, tag); 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 = 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_add) { if (m) 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) { p = hash_get (sm->ip4_main->fib_index_by_table_id, vrf_id); if (!p) return VNET_API_ERROR_NO_SUCH_FIB; fib_index = p[0]; } /* 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; } /* 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[(e_port - 1024) / sm->port_per_thread]++; \ } \ break; foreach_snat_protocol #undef _ default: clib_warning("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)) return VNET_API_ERROR_NO_SUCH_ENTRY; } pool_get (sm->static_mappings, m); memset (m, 0, sizeof (*m)); m->tag = vec_dup (tag); m->local_addr = l_addr; m->external_addr = e_addr; m->addr_only = addr_only; m->vrf_id = vrf_id; m->fib_index = fib_index; m->twice_nat = twice_nat; m->out2in_only = out2in_only; if (!addr_only) { m->local_port = l_port; m->external_port = e_port; m->proto = proto; } if (sm->workers) { ip4_header_t ip = { .src_address = m->local_addr, }; m->worker_index = sm->worker_in2out_cb (&ip, m->fib_index); tsm = vec_elt_at_index (sm->per_thread_data, m->worker_index); } 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 = m->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); if (twice_nat || out2in_only) { m_key.port = clib_host_to_net_u16 (l_port); kv.key = m_key.as_u64; kv.value = ~0ULL; if (clib_bihash_add_del_8_8(&tsm->in2out, &kv, 1)) clib_warning ("in2out key add failed"); } m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.fib_index = sm->outside_fib_index; 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); if (twice_nat || out2in_only) { m_key.port = clib_host_to_net_u16 (e_port); kv.key = m_key.as_u64; kv.value = ~0ULL; if (clib_bihash_add_del_8_8(&tsm->out2in, &kv, 1)) clib_warning ("out2in key add failed"); } /* 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) { if ((s->out2in.addr.as_u32 != e_addr.as_u32) && (clib_net_to_host_u16 (s->out2in.port) != e_port)) continue; } nat_free_session_data (sm, s, tsm - sm->per_thread_data); clib_dlist_remove (tsm->list_pool, s->per_user_index); pool_put_index (tsm->list_pool, s->per_user_index); pool_put (tsm->sessions, s); u->nsessions--; if (!addr_only) break; } } } } } else { if (!m) return VNET_API_ERROR_NO_SUCH_ENTRY; /* 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[(e_port - 1024) / sm->port_per_thread]--; \ } \ break; foreach_snat_protocol #undef _ default: clib_warning("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->worker_index); 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 = m->fib_index; kv.key = m_key.as_u64; if (!out2in_only) clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0); if (twice_nat || out2in_only) { m_key.port = clib_host_to_net_u16 (m->local_port); kv.key = m_key.as_u64; kv.value = ~0ULL; if (clib_bihash_add_del_8_8(&tsm->in2out, &kv, 0)) clib_warning ("in2out key del failed"); } m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.fib_index = sm->outside_fib_index; kv.key = m_key.as_u64; clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 0); if (twice_nat || out2in_only) { m_key.port = clib_host_to_net_u16 (m->external_port); kv.key = m_key.as_u64; kv.value = ~0ULL; if (clib_bihash_add_del_8_8(&tsm->out2in, &kv, 0)) clib_warning ("in2out key del failed"); } /* 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 = 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->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; } nat_free_session_data (sm, s, tsm - sm->per_thread_data); clib_dlist_remove (tsm->list_pool, s->per_user_index); pool_put_index (tsm->list_pool, s->per_user_index); pool_put (tsm->sessions, s); u->nstaticsessions--; if (!addr_only) break; } if (addr_only) { pool_put (tsm->users, u); clib_bihash_add_del_8_8 (&tsm->user_hash, &kv, 0); } } } } vec_free (m->tag); /* 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 */ 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; })); return 0; } static int lb_local_exists (nat44_lb_addr_port_t * local, ip4_address_t * e_addr, u16 e_port) { snat_main_t *sm = &snat_main; snat_static_mapping_t *m; nat44_lb_addr_port_t *ap; /* *INDENT-OFF* */ pool_foreach (m, sm->static_mappings, ({ if (vec_len(m->locals)) { if (m->external_port == e_port && m->external_addr.as_u32 == e_addr->as_u32) continue; vec_foreach (ap, m->locals) { if (ap->port == local->port && ap->addr.as_u32 == local->addr.as_u32) return 1; } } })); /* *INDENT-ON* */ return 0; } int nat44_add_del_lb_static_mapping (ip4_address_t e_addr, u16 e_port, snat_protocol_t proto, u32 vrf_id, nat44_lb_addr_port_t *locals, u8 is_add, u8 twice_nat, u8 out2in_only, u8 *tag) { 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; u32 fib_index; snat_address_t *a = 0; int i; nat44_lb_addr_port_t *local; u32 worker_index = 0, 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; m_key.addr = e_addr; m_key.port = e_port; m_key.protocol = 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_add) { if (m) return VNET_API_ERROR_VALUE_EXIST; if (vec_len (locals) < 2) return VNET_API_ERROR_INVALID_VALUE; fib_index = fib_table_find_or_create_and_lock (FIB_PROTOCOL_IP4, vrf_id, FIB_SOURCE_PLUGIN_HI); /* 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[(e_port - 1024) / sm->port_per_thread]++; \ } \ break; foreach_snat_protocol #undef _ default: clib_warning("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); memset (m, 0, sizeof (*m)); m->tag = vec_dup (tag); m->external_addr = e_addr; m->addr_only = 0; m->vrf_id = vrf_id; m->fib_index = fib_index; m->external_port = e_port; m->proto = proto; m->twice_nat = twice_nat; m->out2in_only = out2in_only; m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.protocol = m->proto; m_key.fib_index = sm->outside_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_external, &kv, 1)) { clib_warning ("static_mapping_by_external key add failed"); return VNET_API_ERROR_UNSPECIFIED; } /* Assign worker */ if (sm->workers) { worker_index = sm->first_worker_index + sm->workers[sm->next_worker++ % vec_len (sm->workers)]; tsm = vec_elt_at_index (sm->per_thread_data, worker_index); m->worker_index = worker_index; } else tsm = vec_elt_at_index (sm->per_thread_data, sm->num_workers); m_key.port = clib_host_to_net_u16 (m->external_port); kv.key = m_key.as_u64; kv.value = ~0ULL; if (clib_bihash_add_del_8_8(&tsm->out2in, &kv, 1)) { clib_warning ("out2in key add failed"); return VNET_API_ERROR_UNSPECIFIED; } m_key.fib_index = m->fib_index; for (i = 0; i < vec_len (locals); i++) { m_key.addr = locals[i].addr; 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); vec_add1 (m->locals, locals[i]); m_key.port = clib_host_to_net_u16 (locals[i].port); kv.key = m_key.as_u64; kv.value = ~0ULL; if (clib_bihash_add_del_8_8(&tsm->in2out, &kv, 1)) { clib_warning ("in2out key add failed"); return VNET_API_ERROR_UNSPECIFIED; } } } else { if (!m) return VNET_API_ERROR_NO_SUCH_ENTRY; fib_table_unlock (m->fib_index, FIB_PROTOCOL_IP4, FIB_SOURCE_PLUGIN_HI); /* 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[(e_port - 1024) / sm->port_per_thread]--; \ } \ break; foreach_snat_protocol #undef _ default: clib_warning("unknown_protocol"); return VNET_API_ERROR_INVALID_VALUE_2; } break; } } } tsm = vec_elt_at_index (sm->per_thread_data, m->worker_index); m_key.addr = m->external_addr; m_key.port = m->external_port; m_key.protocol = m->proto; m_key.fib_index = sm->outside_fib_index; kv.key = m_key.as_u64; if (clib_bihash_add_del_8_8(&sm->static_mapping_by_external, &kv, 0)) { clib_warning ("static_mapping_by_external key del failed"); return VNET_API_ERROR_UNSPECIFIED; } m_key.port = clib_host_to_net_u16 (m->external_port); kv.key = m_key.as_u64; if (clib_bihash_add_del_8_8(&tsm->out2in, &kv, 0)) { clib_warning ("outi2in key del failed"); return VNET_API_ERROR_UNSPECIFIED; } vec_foreach (local, m->locals) { m_key.addr = local->addr; if (!out2in_only) { m_key.port = local->port; m_key.fib_index = m->fib_index; kv.key = m_key.as_u64; if (clib_bihash_add_del_8_8(&sm->static_mapping_by_local, &kv, 0)) { clib_warning ("static_mapping_by_local key del failed"); return VNET_API_ERROR_UNSPECIFIED; } } if (!lb_local_exists(local, &e_addr, e_port)) { m_key.port = clib_host_to_net_u16 (local->port); kv.key = m_key.as_u64; if (clib_bihash_add_del_8_8(&tsm->in2out, &kv, 0)) { clib_warning ("in2out key del failed"); return VNET_API_ERROR_UNSPECIFIED; } } /* Delete sessions */ u_key.addr = 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)) { 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 ((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); clib_dlist_remove (tsm->list_pool, s->per_user_index); pool_put_index (tsm->list_pool, s->per_user_index); pool_put (tsm->sessions, s); u->nstaticsessions--; } } } } vec_free(m->locals); vec_free(m->tag); pool_put (sm->static_mappings, m); } 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; clib_bihash_kv_8_8_t kv, value; snat_user_key_t user_key; snat_user_t *u; 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) { 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, m->addr_only, ~0, m->proto, 0, m->twice_nat, m->out2in_only, m->tag); })); } else { /* Check if address is used in some static mapping */ if (is_snat_address_used_in_static_mapping(sm, addr)) { clib_warning ("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_HI); /* Delete sessions using address */ if (a->busy_tcp_ports || a->busy_udp_ports || a->busy_icmp_ports) { vec_foreach (tsm, sm->per_thread_data) { pool_foreach (ses, tsm->sessions, ({ if (ses->out2in.addr.as_u32 == addr.as_u32) { ses->outside_address_index = ~0; nat_free_session_data (sm, ses, tsm - sm->per_thread_data); clib_dlist_remove (tsm->list_pool, ses->per_user_index); pool_put_index (tsm->list_pool, ses->per_user_index); vec_add1 (ses_to_be_removed, ses - tsm->sessions); user_key.addr = ses->in2out.addr; user_key.fib_index = ses->in2out.fib_index; kv.key = user_key.as_u64; if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) { u = pool_elt_at_index (tsm->users, value.value); u->nsessions--; } } })); vec_foreach (ses_index, ses_to_be_removed) pool_put_index (tsm->sessions, ses_index[0]); vec_free (ses_to_be_removed); } } if (twice_nat) { vec_del1 (sm->twice_nat_addresses, i); return 0; } else vec_del1 (sm->addresses, i); /* Delete external address from FIB */ 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; })); 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; if (sm->out2in_dpo && !is_inside) return VNET_API_ERROR_UNSUPPORTED; pool_foreach (i, sm->output_feature_interfaces, ({ if (i->sw_if_index == sw_if_index) return VNET_API_ERROR_VALUE_EXIST; })); 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 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, 0); 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, 0); 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 { 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); } else { vnet_feature_enable_disable ("ip4-unicast", feature_name, sw_if_index, 0, 0, 0); pool_put (sm->interfaces, i); } } 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 { 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); goto set_flags; } goto fib; } })); 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); set_flags: 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 && !sm->out2in_dpo) { vnet_feature_enable_disable ("ip4-local", "nat44-hairpinning", sw_if_index, !is_del, 0, 0); return 0; } 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 (!(m->addr_only) || (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); })); 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; if (sm->deterministic || (sm->static_mapping_only && !(sm->static_mapping_connection_tracking))) return VNET_API_ERROR_UNSUPPORTED; pool_foreach (i, sm->interfaces, ({ if (i->sw_if_index == sw_if_index) return VNET_API_ERROR_VALUE_EXIST; })); if (is_inside) { 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 { 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); 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; } })); 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; 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 (!(m->addr_only)) continue; snat_add_del_addr_to_fib(&m->external_addr, 32, sw_if_index, !is_del); })); 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); clib_bitmap_foreach (i, bitmap, ({ vec_add1(sm->workers, i); sm->per_thread_data[sm->first_worker_index + i].snat_thread_index = j; j++; })); sm->port_per_thread = (0xffff - 1024) / _vec_len (sm->workers); sm->num_snat_thread = _vec_len (sm->workers); return 0; } 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 int nat_alloc_addr_and_port_default (snat_address_t * addresses, u32 fib_index, u32 thread_index, snat_session_key_t * k, u32 * address_indexp, 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; 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->next_worker = 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_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->forwarding_enabled = 0; 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); nat_dpo_module_init (); /* Init IPFIX logging */ snat_ipfix_logging_init(vm); /* Init NAT64 */ error = nat64_init(vm); if (error) return error; dslite_init(vm); nat66_init(); /* 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, u32 address_index) { snat_address_t *a; u16 port_host_byte_order = clib_net_to_host_u16 (k->port); 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: clib_warning("unknown_protocol"); return; } } /** * @brief Match NAT44 static mapping. * * @param sm NAT main. * @param match Address and port to match. * @param mapping External or local address and port of the matched mapping. * @param by_external If 0 match by local address otherwise match by external * address. * @param is_addr_only If matched mapping is address only * @param twice_nat If matched mapping is twice NAT. * * @returns 0 if match found otherwise 1. */ 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, u8 *twice_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; if (by_external) mapping_hash = &sm->static_mapping_by_external; m_key.addr = match.addr; m_key.port = clib_net_to_host_u16 (match.port); m_key.protocol = match.protocol; m_key.fib_index = match.fib_index; 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 (vec_len (m->locals)) { hi = vec_len (m->locals) - 1; rand = 1 + (random_u32 (&sm->random_seed) % m->locals[hi].prefix); while (lo < hi) { mid = ((hi - lo) >> 1) + lo; (rand > m->locals[mid].prefix) ? (lo = mid + 1) : (hi = mid); } if (!(m->locals[lo].prefix >= rand)) return 1; mapping->addr = m->locals[lo].addr; mapping->port = clib_host_to_net_u16 (m->locals[lo].port); } else { mapping->addr = m->local_addr; /* Address only mapping doesn't change port */ mapping->port = m->addr_only ? match.port : clib_host_to_net_u16 (m->local_port); } mapping->fib_index = m->fib_index; mapping->protocol = m->proto; } else { mapping->addr = m->external_addr; /* Address only mapping doesn't change port */ mapping->port = m->addr_only ? match.port : clib_host_to_net_u16 (m->external_port); mapping->fib_index = sm->outside_fib_index; } if (PREDICT_FALSE(is_addr_only != 0)) *is_addr_only = m->addr_only; if (PREDICT_FALSE(twice_nat != 0)) *twice_nat = m->twice_nat; 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, u32 * address_indexp, 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, address_indexp, 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, u32 * address_indexp, u16 port_per_thread, u32 snat_thread_index) { int i, gi = 0; 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); \ *address_indexp = i; \ return 0; \ } \ } \ else if (a->fib_index == ~0) \ { \ ga = a; \ gi = i; \ } \ } \ break; foreach_snat_protocol #undef _ default: clib_warning("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); \ *address_indexp = gi; \ return 0; \ } break; foreach_snat_protocol #undef _ default: clib_warning ("unknown protocol"); return 1; } } /* Totally out of translations to use... */ snat_ipfix_logging_addresses_exhausted(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, u32 * address_indexp, 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); \ *address_indexp = i; \ return 0; \ } \ } \ break; foreach_snat_protocol #undef _ default: clib_warning("unknown protocol"); return 1; } exhausted: /* Totally out of translations to use... */ snat_ipfix_logging_addresses_exhausted(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); } } uword unformat_snat_protocol (unformat_input_t * input, va_list * args) { u32 *r = va_arg (*args, u32 *); if (0); #define _(N, i, n, s) else if (unformat (input, s)) *r = SNAT_PROTOCOL_##N; foreach_snat_protocol #undef _ else return 0; return 1; } u8 * format_snat_protocol (u8 * s, va_list * args) { u32 i = va_arg (*args, u32); u8 *t = 0; switch (i) { #define _(N, j, n, str) case SNAT_PROTOCOL_##N: t = (u8 *) str; break; foreach_snat_protocol #undef _ default: s = format (s, "unknown"); return s; } s = format (s, "%s", t); 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; nat_ed_ses_key_t key; clib_bihash_kv_16_8_t s_kv, s_value; snat_main_per_thread_data_t *tsm; snat_session_t *s; int i; 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->worker_index; } } 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 (); if (PREDICT_TRUE (!ip4_is_first_fragment (ip0))) { 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; else return vlib_get_thread_index (); } } /* unknown protocol */ if (PREDICT_FALSE (proto == ~0)) { key.l_addr = ip0->dst_address; key.r_addr = ip0->src_address; key.fib_index = rx_fib_index0; key.proto = ip0->protocol; key.r_port = 0; key.l_port = 0; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; if (!clib_bihash_search_16_8 (&sm->out2in_ed, &s_kv, &s_value)) { for (i = 0; i < _vec_len (sm->per_thread_data); i++) { tsm = vec_elt_at_index (sm->per_thread_data, i); if (!pool_is_free_index(tsm->sessions, s_value.value)) { s = pool_elt_at_index (tsm->sessions, s_value.value); if (s->out2in.addr.as_u32 == ip0->dst_address.as_u32 && s->out2in.port == ip0->protocol && snat_is_unk_proto_session (s)) return i; } } } /* if no session 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->worker_index; } } /* 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 clib_error_t * snat_config (vlib_main_t * vm, unformat_input_t * input) { snat_main_t * sm = &snat_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 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; 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, "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 return clib_error_return (0, "unknown input '%U'", format_unformat_error, input); } /* 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); 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 { 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; if (!static_mapping_only || (static_mapping_only && static_mapping_connection_tracking)) { sm->icmp_match_in2out_cb = icmp_match_in2out_slow; sm->icmp_match_out2in_cb = icmp_match_out2in_slow; vec_foreach (tsm, sm->per_thread_data) { clib_bihash_init_8_8 (&tsm->in2out, "in2out", translation_buckets, translation_memory_size); clib_bihash_init_8_8 (&tsm->out2in, "out2in", translation_buckets, translation_memory_size); clib_bihash_init_8_8 (&tsm->user_hash, "users", user_buckets, user_memory_size); } clib_bihash_init_16_8 (&sm->in2out_ed, "in2out-ed", translation_buckets, translation_memory_size); clib_bihash_init_16_8 (&sm->out2in_ed, "out2in-ed", translation_buckets, translation_memory_size); } 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_init_8_8 (&sm->static_mapping_by_external, "static_mapping_by_external", static_mapping_buckets, static_mapping_memory_size); } return 0; } VLIB_CONFIG_FUNCTION (snat_config, "nat"); u8 * format_snat_session_state (u8 * s, va_list * args) { u32 i = va_arg (*args, u32); u8 *t = 0; switch (i) { #define _(v, N, str) case SNAT_SESSION_##N: t = (u8 *) str; break; foreach_snat_session_state #undef _ default: t = format (t, "unknown"); } s = format (s, "%s", t); return s; } u8 * format_snat_key (u8 * s, va_list * args) { snat_session_key_t * key = va_arg (*args, snat_session_key_t *); s = format (s, "%U proto %U port %d fib %d", format_ip4_address, &key->addr, format_snat_protocol, key->protocol, clib_net_to_host_u16 (key->port), key->fib_index); return s; } u8 * format_snat_session (u8 * s, va_list * args) { snat_main_t * sm __attribute__((unused)) = va_arg (*args, snat_main_t *); snat_session_t * sess = va_arg (*args, snat_session_t *); if (snat_is_unk_proto_session (sess)) { s = format (s, " i2o %U proto %u fib %u\n", format_ip4_address, &sess->in2out.addr, clib_net_to_host_u16 (sess->in2out.port), sess->in2out.fib_index); s = format (s, " o2i %U proto %u fib %u\n", format_ip4_address, &sess->out2in.addr, clib_net_to_host_u16 (sess->out2in.port), sess->out2in.fib_index); } else { s = format (s, " i2o %U\n", format_snat_key, &sess->in2out); s = format (s, " o2i %U\n", format_snat_key, &sess->out2in); } if (is_twice_nat_session (sess)) { s = format (s, " external host o2i %U:%d i2o %U:%d\n", format_ip4_address, &sess->ext_host_addr, clib_net_to_host_u16 (sess->ext_host_port), format_ip4_address, &sess->ext_host_nat_addr, clib_net_to_host_u16 (sess->ext_host_nat_port)); } else { if (sess->ext_host_addr.as_u32) s = format (s, " external host %U\n", format_ip4_address, &sess->ext_host_addr); } s = format (s, " last heard %.2f\n", sess->last_heard); s = format (s, " total pkts %d, total bytes %lld\n", sess->total_pkts, sess->total_bytes); if (snat_is_session_static (sess)) s = format (s, " static translation\n"); else s = format (s, " dynamic translation\n"); if (sess->flags & SNAT_SESSION_FLAG_LOAD_BALANCING) s = format (s, " load-balancing\n"); if (is_twice_nat_session (sess)) s = format (s, " twice-nat\n"); return s; } u8 * format_snat_user (u8 * s, va_list * args) { snat_main_per_thread_data_t * sm = va_arg (*args, snat_main_per_thread_data_t *); snat_user_t * u = va_arg (*args, snat_user_t *); int verbose = va_arg (*args, int); dlist_elt_t * head, * elt; u32 elt_index, head_index; u32 session_index; snat_session_t * sess; s = format (s, "%U: %d dynamic translations, %d static translations\n", format_ip4_address, &u->addr, u->nsessions, u->nstaticsessions); if (verbose == 0) return s; if (u->nsessions || u->nstaticsessions) { head_index = u->sessions_per_user_list_head_index; head = pool_elt_at_index (sm->list_pool, head_index); elt_index = head->next; elt = pool_elt_at_index (sm->list_pool, elt_index); session_index = elt->value; while (session_index != ~0) { sess = pool_elt_at_index (sm->sessions, session_index); s = format (s, " %U\n", format_snat_session, sm, sess); elt_index = elt->next; elt = pool_elt_at_index (sm->list_pool, elt_index); session_index = elt->value; } } return s; } u8 * format_snat_static_mapping (u8 * s, va_list * args) { snat_static_mapping_t *m = va_arg (*args, snat_static_mapping_t *); nat44_lb_addr_port_t *local; if (m->addr_only) s = format (s, "local %U external %U vrf %d %s", format_ip4_address, &m->local_addr, format_ip4_address, &m->external_addr, m->vrf_id, m->twice_nat ? "twice-nat" : ""); else { if (vec_len (m->locals)) { s = format (s, "%U vrf %d external %U:%d %s %s", format_snat_protocol, m->proto, m->vrf_id, format_ip4_address, &m->external_addr, m->external_port, m->twice_nat ? "twice-nat" : "", m->out2in_only ? "out2in-only" : ""); vec_foreach (local, m->locals) s = format (s, "\n local %U:%d probability %d\%", format_ip4_address, &local->addr, local->port, local->probability); } else s = format (s, "%U local %U:%d external %U:%d vrf %d %s %s", format_snat_protocol, m->proto, format_ip4_address, &m->local_addr, m->local_port, format_ip4_address, &m->external_addr, m->external_port, m->vrf_id, m->twice_nat ? "twice-nat" : "", m->out2in_only ? "out2in-only" : ""); } return s; } u8 * format_snat_static_map_to_resolve (u8 * s, va_list * args) { snat_static_map_resolve_t *m = va_arg (*args, snat_static_map_resolve_t *); vnet_main_t *vnm = vnet_get_main(); if (m->addr_only) s = format (s, "local %U external %U vrf %d", format_ip4_address, &m->l_addr, format_vnet_sw_if_index_name, vnm, m->sw_if_index, m->vrf_id); else s = format (s, "%U local %U:%d external %U:%d vrf %d", format_snat_protocol, m->proto, format_ip4_address, &m->l_addr, m->l_port, format_vnet_sw_if_index_name, vnm, m->sw_if_index, m->e_port, m->vrf_id); return s; } u8 * format_det_map_ses (u8 * s, va_list * args) { snat_det_map_t * det_map = va_arg (*args, snat_det_map_t *); ip4_address_t in_addr, out_addr; u32 in_offset, out_offset; snat_det_session_t * ses = va_arg (*args, snat_det_session_t *); u32 * i = va_arg (*args, u32 *); u32 user_index = *i / SNAT_DET_SES_PER_USER; in_addr.as_u32 = clib_host_to_net_u32 ( clib_net_to_host_u32(det_map->in_addr.as_u32) + user_index); in_offset = clib_net_to_host_u32(in_addr.as_u32) - clib_net_to_host_u32(det_map->in_addr.as_u32); out_offset = in_offset / det_map->sharing_ratio; out_addr.as_u32 = clib_host_to_net_u32( clib_net_to_host_u32(det_map->out_addr.as_u32) + out_offset); s = format (s, "in %U:%d out %U:%d external host %U:%d state: %U expire: %d\n", format_ip4_address, &in_addr, clib_net_to_host_u16 (ses->in_port), format_ip4_address, &out_addr, clib_net_to_host_u16 (ses->out.out_port), format_ip4_address, &ses->out.ext_host_addr, clib_net_to_host_u16 (ses->out.ext_host_port), format_snat_session_state, ses->state, ses->expire); return s; } 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; 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; /* 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, 0, 0, rp->tag); if (rv) clib_warning ("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) 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; snat_user_key_t u_key; snat_user_t *u; 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)) { s = pool_elt_at_index (tsm->sessions, value.value); kv.key = s->in2out.as_u64; clib_bihash_add_del_8_8 (&tsm->in2out, &kv, 0); kv.key = s->out2in.as_u64; clib_bihash_add_del_8_8 (&tsm->out2in, &kv, 0); u_key.addr = s->in2out.addr; u_key.fib_index = s->in2out.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); u->nsessions--; } clib_dlist_remove (tsm->list_pool, s->per_user_index); pool_put (tsm->sessions, s); return 0; } return VNET_API_ERROR_NO_SUCH_ENTRY; } void nat_set_alloc_addr_and_port_mape (u16 psid, u16 psid_offset, u16 psid_length) { snat_main_t *sm = &snat_main; 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_default (void) { snat_main_t *sm = &snat_main; sm->alloc_addr_and_port = nat_alloc_addr_and_port_default; }