/* * Copyright (c) 2018 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. */ /** * @file * @brief NAT44 endpoint-dependent inside to outside network translation */ #include #include #include #include #include #include #include #include #include #include #include #define foreach_nat_in2out_ed_error \ _(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ _(IN2OUT_PACKETS, "Good in2out packets processed") \ _(OUT_OF_PORTS, "Out of ports") \ _(BAD_ICMP_TYPE, "unsupported ICMP type") \ _(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \ _(DROP_FRAGMENT, "Drop fragment") \ _(MAX_REASS, "Maximum reassemblies exceeded") \ _(MAX_FRAG, "Maximum fragments per reassembly exceeded") typedef enum { #define _(sym,str) NAT_IN2OUT_ED_ERROR_##sym, foreach_nat_in2out_ed_error #undef _ NAT_IN2OUT_ED_N_ERROR, } nat_in2out_ed_error_t; static char *nat_in2out_ed_error_strings[] = { #define _(sym,string) string, foreach_nat_in2out_ed_error #undef _ }; typedef enum { NAT_IN2OUT_ED_NEXT_LOOKUP, NAT_IN2OUT_ED_NEXT_DROP, NAT_IN2OUT_ED_NEXT_ICMP_ERROR, NAT_IN2OUT_ED_NEXT_SLOW_PATH, NAT_IN2OUT_ED_NEXT_REASS, NAT_IN2OUT_ED_N_NEXT, } nat_in2out_ed_next_t; typedef struct { u32 sw_if_index; u32 next_index; u32 session_index; u32 is_slow_path; } nat_in2out_ed_trace_t; vlib_node_registration_t nat44_ed_in2out_node; vlib_node_registration_t nat44_ed_in2out_slowpath_node; vlib_node_registration_t nat44_ed_in2out_output_node; vlib_node_registration_t nat44_ed_in2out_output_slowpath_node; vlib_node_registration_t nat44_ed_in2out_reass_node; static u8 * format_nat_in2out_ed_trace (u8 * s, va_list * args) { CLIB_UNUSED (vlib_main_t * vm) = va_arg (*args, vlib_main_t *); CLIB_UNUSED (vlib_node_t * node) = va_arg (*args, vlib_node_t *); nat_in2out_ed_trace_t *t = va_arg (*args, nat_in2out_ed_trace_t *); char *tag; tag = t->is_slow_path ? "NAT44_IN2OUT_ED_SLOW_PATH" : "NAT44_IN2OUT_ED_FAST_PATH"; s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag, t->sw_if_index, t->next_index, t->session_index); return s; } static_always_inline int icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0) { icmp46_header_t *icmp0; nat_ed_ses_key_t key0; icmp_echo_header_t *echo0, *inner_echo0 = 0; ip4_header_t *inner_ip0 = 0; void *l4_header = 0; icmp46_header_t *inner_icmp0; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); echo0 = (icmp_echo_header_t *) (icmp0 + 1); if (!icmp_is_error_message (icmp0)) { key0.proto = IP_PROTOCOL_ICMP; key0.l_addr = ip0->src_address; key0.r_addr = ip0->dst_address; key0.l_port = echo0->identifier; key0.r_port = 0; } else { inner_ip0 = (ip4_header_t *) (echo0 + 1); l4_header = ip4_next_header (inner_ip0); key0.proto = inner_ip0->protocol; key0.r_addr = inner_ip0->src_address; key0.l_addr = inner_ip0->dst_address; switch (ip_proto_to_snat_proto (inner_ip0->protocol)) { case SNAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t *) l4_header; inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); key0.r_port = 0; key0.l_port = inner_echo0->identifier; break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: key0.l_port = ((tcp_udp_header_t *) l4_header)->dst_port; key0.r_port = ((tcp_udp_header_t *) l4_header)->src_port; break; default: return NAT_IN2OUT_ED_ERROR_UNSUPPORTED_PROTOCOL; } } *p_key0 = key0; return 0; } int nat44_i2o_ed_is_idle_session_cb (clib_bihash_kv_16_8_t * kv, void *arg) { snat_main_t *sm = &snat_main; nat44_is_idle_session_ctx_t *ctx = arg; snat_session_t *s; u64 sess_timeout_time; nat_ed_ses_key_t ed_key; clib_bihash_kv_16_8_t ed_kv; int i; snat_address_t *a; snat_session_key_t key; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, ctx->thread_index); s = pool_elt_at_index (tsm->sessions, kv->value); sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s); if (ctx->now >= sess_timeout_time) { if (is_fwd_bypass_session (s)) goto delete; 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"); if (snat_is_unk_proto_session (s)) goto delete; 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); 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, ctx->thread_index, &key); break; } } } if (snat_is_session_static (s)) goto delete; snat_free_outside_address_and_port (sm->addresses, ctx->thread_index, &s->out2in); delete: nat44_delete_session (sm, s, ctx->thread_index); return 1; } return 0; } static inline u32 icmp_in2out_ed_slow_path (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0, icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0, vlib_node_runtime_t * node, u32 next0, f64 now, u32 thread_index, snat_session_t ** p_s0) { next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, thread_index, p_s0, 0); snat_session_t *s0 = *p_s0; if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP && s0)) { /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (sm->vlib_main, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); } return next0; } static u32 slow_path_ed (snat_main_t * sm, vlib_buffer_t * b, u32 rx_fib_index, clib_bihash_kv_16_8_t * kv, snat_session_t ** sessionp, vlib_node_runtime_t * node, u32 next, u32 thread_index, f64 now) { snat_session_t *s = 0; snat_user_t *u; snat_session_key_t key0, key1; lb_nat_type_t lb = 0, is_sm = 0; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; nat_ed_ses_key_t *key = (nat_ed_ses_key_t *) kv->key; u32 proto = ip_proto_to_snat_proto (key->proto); nat_outside_fib_t *outside_fib; fib_node_index_t fei = FIB_NODE_INDEX_INVALID; u8 identity_nat; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = 32, .fp_addr = { .ip4.as_u32 = key->r_addr.as_u32, }, }; nat44_is_idle_session_ctx_t ctx; if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) { b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED]; nat_ipfix_logging_max_sessions (sm->max_translations); nat_log_notice ("maximum sessions exceeded"); return NAT_IN2OUT_ED_NEXT_DROP; } key0.addr = key->l_addr; key0.port = key->l_port; key1.protocol = key0.protocol = proto; key0.fib_index = rx_fib_index; key1.fib_index = sm->outside_fib_index; /* First try to match static mapping by local address and port */ if (snat_static_mapping_match (sm, key0, &key1, 0, 0, 0, &lb, 0, &identity_nat)) { /* Try to create dynamic translation */ if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index, thread_index, &key1, sm->port_per_thread, tsm->snat_thread_index)) { nat_log_notice ("addresses exhausted"); b->error = node->errors[NAT_IN2OUT_ED_ERROR_OUT_OF_PORTS]; return NAT_IN2OUT_ED_NEXT_DROP; } } else { if (PREDICT_FALSE (identity_nat)) { *sessionp = s; return next; } is_sm = 1; } u = nat_user_get_or_create (sm, &key->l_addr, rx_fib_index, thread_index); if (!u) { nat_log_warn ("create NAT user failed"); if (!is_sm) snat_free_outside_address_and_port (sm->addresses, thread_index, &key1); return NAT_IN2OUT_ED_NEXT_DROP; } s = nat_ed_session_alloc (sm, u, thread_index, now); if (!s) { nat44_delete_user_with_no_session (sm, u, thread_index); nat_log_warn ("create NAT session failed"); if (!is_sm) snat_free_outside_address_and_port (sm->addresses, thread_index, &key1); return NAT_IN2OUT_ED_NEXT_DROP; } user_session_increment (sm, u, is_sm); if (is_sm) s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; if (lb) s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING; s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; s->ext_host_addr = key->r_addr; s->ext_host_port = key->r_port; s->in2out = key0; s->out2in = key1; s->out2in.protocol = key0.protocol; switch (vec_len (sm->outside_fibs)) { case 0: s->out2in.fib_index = sm->outside_fib_index; break; case 1: s->out2in.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) { s->out2in.fib_index = outside_fib->fib_index; break; } } } /* *INDENT-ON* */ break; } /* Add to lookup tables */ kv->value = s - tsm->sessions; ctx.now = now; ctx.thread_index = thread_index; if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, kv, nat44_i2o_ed_is_idle_session_cb, &ctx)) nat_log_notice ("in2out-ed key add failed"); make_ed_kv (kv, &key1.addr, &key->r_addr, key->proto, s->out2in.fib_index, key1.port, key->r_port); kv->value = s - tsm->sessions; if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, kv, nat44_o2i_ed_is_idle_session_cb, &ctx)) nat_log_notice ("out2in-ed key add failed"); *sessionp = s; /* log NAT event */ snat_ipfix_logging_nat44_ses_create (s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->in2out.protocol, s->in2out.port, s->out2in.port, s->in2out.fib_index); return next; } static_always_inline int nat44_ed_not_translate (snat_main_t * sm, vlib_node_runtime_t * node, u32 sw_if_index, ip4_header_t * ip, u32 proto, u32 rx_fib_index, u32 thread_index) { udp_header_t *udp = ip4_next_header (ip); snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; clib_bihash_kv_16_8_t kv, value; snat_session_key_t key0, key1; make_ed_kv (&kv, &ip->dst_address, &ip->src_address, ip->protocol, sm->outside_fib_index, udp->dst_port, udp->src_port); /* NAT packet aimed at external address if */ /* has active sessions */ if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value)) { key0.addr = ip->dst_address; key0.port = udp->dst_port; key0.protocol = proto; key0.fib_index = sm->outside_fib_index; /* or is static mappings */ if (!snat_static_mapping_match (sm, key0, &key1, 1, 0, 0, 0, 0, 0)) return 0; } else return 0; if (sm->forwarding_enabled) return 1; return snat_not_translate_fast (sm, node, sw_if_index, ip, proto, rx_fib_index); } static_always_inline int nat_not_translate_output_feature_fwd (snat_main_t * sm, ip4_header_t * ip, u32 thread_index, f64 now, vlib_main_t * vm, vlib_buffer_t * b) { nat_ed_ses_key_t key; clib_bihash_kv_16_8_t kv, value; udp_header_t *udp; snat_session_t *s = 0; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; if (!sm->forwarding_enabled) return 0; if (ip->protocol == IP_PROTOCOL_ICMP) { key.as_u64[0] = key.as_u64[1] = 0; if (icmp_get_ed_key (ip, &key)) return 0; key.fib_index = 0; kv.key[0] = key.as_u64[0]; kv.key[1] = key.as_u64[1]; } else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP) { udp = ip4_next_header (ip); make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, udp->src_port, udp->dst_port); } else { make_ed_kv (&kv, &ip->src_address, &ip->dst_address, ip->protocol, 0, 0, 0); } if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value)) { s = pool_elt_at_index (tsm->sessions, value.value); if (is_fwd_bypass_session (s)) { if (ip->protocol == IP_PROTOCOL_TCP) { tcp_header_t *tcp = ip4_next_header (ip); if (nat44_set_tcp_session_state_i2o (sm, s, tcp, thread_index)) return 1; } /* Accounting */ nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s, thread_index); return 1; } else return 0; } return 0; } static_always_inline int nat44_ed_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip, u8 proto, u16 src_port, u16 dst_port, u32 thread_index, u32 rx_sw_if_index, u32 tx_sw_if_index) { clib_bihash_kv_16_8_t kv, value; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; snat_interface_t *i; snat_session_t *s; u32 rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (rx_sw_if_index); u32 tx_fib_index = ip4_fib_table_get_index_for_sw_if_index (tx_sw_if_index); /* src NAT check */ make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, tx_fib_index, src_port, dst_port); if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value)) return 1; /* dst NAT check */ make_ed_kv (&kv, &ip->dst_address, &ip->src_address, proto, rx_fib_index, dst_port, src_port); if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value)) { s = pool_elt_at_index (tsm->sessions, value.value); if (is_fwd_bypass_session (s)) return 0; /* hairpinning */ /* *INDENT-OFF* */ pool_foreach (i, sm->output_feature_interfaces, ({ if ((nat_interface_is_inside (i)) && (rx_sw_if_index == i->sw_if_index)) return 0; })); /* *INDENT-ON* */ return 1; } return 0; } u32 icmp_match_in2out_ed (snat_main_t * sm, vlib_node_runtime_t * node, u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip, u8 * p_proto, snat_session_key_t * p_value, u8 * p_dont_translate, void *d, void *e) { icmp46_header_t *icmp; u32 sw_if_index; u32 rx_fib_index; nat_ed_ses_key_t key; snat_session_t *s = 0; u8 dont_translate = 0; clib_bihash_kv_16_8_t kv, value; u32 next = ~0; int err; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; icmp = (icmp46_header_t *) ip4_next_header (ip); sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX]; rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index); key.as_u64[0] = key.as_u64[1] = 0; err = icmp_get_ed_key (ip, &key); if (err != 0) { b->error = node->errors[err]; next = NAT_IN2OUT_ED_NEXT_DROP; goto out; } key.fib_index = rx_fib_index; kv.key[0] = key.as_u64[0]; kv.key[1] = key.as_u64[1]; if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value)) { if (vnet_buffer (b)->sw_if_index[VLIB_TX] != ~0) { if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip, key.proto, key. l_port, key. r_port, thread_index, sw_if_index, vnet_buffer (b)-> sw_if_index [VLIB_TX]))) { dont_translate = 1; goto out; } } else { if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index, ip, SNAT_PROTOCOL_ICMP, rx_fib_index, thread_index))) { dont_translate = 1; goto out; } } if (PREDICT_FALSE (icmp_is_error_message (icmp))) { b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE]; next = NAT_IN2OUT_ED_NEXT_DROP; goto out; } next = slow_path_ed (sm, b, rx_fib_index, &kv, &s, node, next, thread_index, vlib_time_now (sm->vlib_main)); if (PREDICT_FALSE (next == NAT_IN2OUT_ED_NEXT_DROP)) goto out; if (!s) { dont_translate = 1; goto out; } } else { if (PREDICT_FALSE (icmp->type != ICMP4_echo_request && icmp->type != ICMP4_echo_reply && !icmp_is_error_message (icmp))) { b->error = node->errors[NAT_IN2OUT_ED_ERROR_BAD_ICMP_TYPE]; next = NAT_IN2OUT_ED_NEXT_DROP; goto out; } s = pool_elt_at_index (tsm->sessions, value.value); } *p_proto = ip_proto_to_snat_proto (key.proto); out: if (s) *p_value = s->out2in; *p_dont_translate = dont_translate; if (d) *(snat_session_t **) d = s; return next; } static snat_session_t * nat44_ed_in2out_unknown_proto (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip, u32 rx_fib_index, u32 thread_index, f64 now, vlib_main_t * vm, vlib_node_runtime_t * node) { clib_bihash_kv_8_8_t kv, value; clib_bihash_kv_16_8_t s_kv, s_value; snat_static_mapping_t *m; u32 old_addr, new_addr = 0; ip_csum_t sum; snat_user_t *u; dlist_elt_t *head, *elt; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; u32 elt_index, head_index, ses_index; snat_session_t *s; u32 outside_fib_index = sm->outside_fib_index; int i; u8 is_sm = 0; nat_outside_fib_t *outside_fib; fib_node_index_t fei = FIB_NODE_INDEX_INVALID; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = 32, .fp_addr = { .ip4.as_u32 = ip->dst_address.as_u32, }, }; switch (vec_len (sm->outside_fibs)) { case 0: outside_fib_index = sm->outside_fib_index; break; case 1: outside_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) { outside_fib_index = outside_fib->fib_index; break; } } } /* *INDENT-ON* */ break; } old_addr = ip->src_address.as_u32; make_ed_kv (&s_kv, &ip->src_address, &ip->dst_address, ip->protocol, rx_fib_index, 0, 0); if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &s_kv, &s_value)) { s = pool_elt_at_index (tsm->sessions, s_value.value); new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32; } else { if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) { b->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_SESSIONS_EXCEEDED]; nat_ipfix_logging_max_sessions (sm->max_translations); nat_log_notice ("maximum sessions exceeded"); return 0; } u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index, thread_index); if (!u) { nat_log_warn ("create NAT user failed"); return 0; } make_sm_kv (&kv, &ip->src_address, 0, rx_fib_index, 0); /* Try to find static mapping first */ if (!clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value)) { m = pool_elt_at_index (sm->static_mappings, value.value); new_addr = ip->src_address.as_u32 = m->external_addr.as_u32; is_sm = 1; goto create_ses; } /* Fallback to 3-tuple key */ else { /* Choose same out address as for TCP/UDP session to same destination */ head_index = u->sessions_per_user_list_head_index; head = pool_elt_at_index (tsm->list_pool, head_index); elt_index = head->next; if (PREDICT_FALSE (elt_index == ~0)) ses_index = ~0; else { 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_index = elt->next; elt = pool_elt_at_index (tsm->list_pool, elt_index); ses_index = elt->value; if (s->ext_host_addr.as_u32 == ip->dst_address.as_u32) { new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32; make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol, outside_fib_index, 0, 0); if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value)) goto create_ses; break; } } for (i = 0; i < vec_len (sm->addresses); i++) { make_ed_kv (&s_kv, &sm->addresses[i].addr, &ip->dst_address, ip->protocol, outside_fib_index, 0, 0); if (clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value)) { new_addr = ip->src_address.as_u32 = sm->addresses[i].addr.as_u32; goto create_ses; } } return 0; } create_ses: s = nat_ed_session_alloc (sm, u, thread_index, now); if (!s) { nat44_delete_user_with_no_session (sm, u, thread_index); nat_log_warn ("create NAT session failed"); return 0; } s->ext_host_addr.as_u32 = ip->dst_address.as_u32; s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO; s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; s->out2in.addr.as_u32 = new_addr; s->out2in.fib_index = outside_fib_index; s->in2out.addr.as_u32 = old_addr; s->in2out.fib_index = rx_fib_index; s->in2out.port = s->out2in.port = ip->protocol; if (is_sm) s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; user_session_increment (sm, u, is_sm); /* Add to lookup tables */ make_ed_kv (&s_kv, &s->in2out.addr, &ip->dst_address, ip->protocol, rx_fib_index, 0, 0); s_kv.value = s - tsm->sessions; if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1)) nat_log_notice ("in2out key add failed"); make_ed_kv (&s_kv, &s->out2in.addr, &ip->dst_address, ip->protocol, outside_fib_index, 0, 0); s_kv.value = s - tsm->sessions; if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1)) nat_log_notice ("out2in key add failed"); } /* Update IP checksum */ sum = ip->checksum; sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address); ip->checksum = ip_csum_fold (sum); /* Accounting */ nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s, thread_index); /* Hairpinning */ if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0) nat44_ed_hairpinning_unknown_proto (sm, b, ip); if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0) vnet_buffer (b)->sw_if_index[VLIB_TX] = outside_fib_index; return s; } static inline uword nat44_ed_in2out_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_slow_path, int is_output_feature) { u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index; nat_in2out_ed_next_t next_index; snat_main_t *sm = &snat_main; f64 now = vlib_time_now (vm); u32 thread_index = vm->thread_index; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; stats_node_index = is_slow_path ? nat44_ed_in2out_slowpath_node.index : nat44_ed_in2out_node.index; 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 >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0, new_addr0, old_addr0; u32 next1, sw_if_index1, rx_fib_index1, iph_offset1 = 0, proto1, new_addr1, old_addr1; u16 old_port0, new_port0, old_port1, new_port1; ip4_header_t *ip0, *ip1; udp_header_t *udp0, *udp1; tcp_header_t *tcp0, *tcp1; icmp46_header_t *icmp0, *icmp1; snat_session_t *s0 = 0, *s1 = 0; clib_bihash_kv_16_8_t kv0, value0, kv1, value1; ip_csum_t sum0, sum1; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; from += 2; to_next += 2; n_left_from -= 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); next0 = NAT_IN2OUT_ED_NEXT_LOOKUP; if (is_output_feature) iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length; ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + iph_offset0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0); if (PREDICT_FALSE (ip0->ttl == 1)) { vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded, ICMP4_time_exceeded_ttl_exceeded_in_transit, 0); next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR; goto trace00; } udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_header_t *) udp0; proto0 = ip_proto_to_snat_proto (ip0->protocol); if (is_slow_path) { if (PREDICT_FALSE (proto0 == ~0)) { s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); if (!s0) next0 = NAT_IN2OUT_ED_NEXT_DROP; goto trace00; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_in2out_ed_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); goto trace00; } } else { if (PREDICT_FALSE (proto0 == ~0)) { next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace00; } if (ip4_is_fragment (ip0)) { next0 = NAT_IN2OUT_ED_NEXT_REASS; goto trace00; } if (is_output_feature) { if (PREDICT_FALSE (nat_not_translate_output_feature_fwd (sm, ip0, thread_index, now, vm, b0))) goto trace00; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace00; } } make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address, ip0->protocol, rx_fib_index0, udp0->src_port, udp0->dst_port); if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip0, ip0->protocol, udp0->src_port, udp0->dst_port, thread_index, sw_if_index0, vnet_buffer (b0)->sw_if_index[VLIB_TX]))) goto trace00; } else { if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) goto trace00; } next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node, next0, thread_index, now); if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP)) goto trace00; if (PREDICT_FALSE (!s0)) goto trace00; } else { next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace00; } } else { s0 = pool_elt_at_index (tsm->sessions, value0.value); } b0->flags |= VNET_BUFFER_F_IS_NATED; if (!is_output_feature) vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index; old_addr0 = ip0->src_address.as_u32; new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, src_address); if (PREDICT_FALSE (is_twice_nat_session (s0))) sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32, s0->ext_host_addr.as_u32, ip4_header_t, dst_address); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->src_port; new_port0 = tcp0->src_port = s0->out2in.port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t, length); if (PREDICT_FALSE (is_twice_nat_session (s0))) { sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32, s0->ext_host_addr.as_u32, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, tcp0->dst_port, s0->ext_host_port, ip4_header_t, length); tcp0->dst_port = s0->ext_host_port; ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32; } mss_clamping (sm, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); if (nat44_set_tcp_session_state_i2o (sm, s0, tcp0, thread_index)) goto trace00; } else { udp0->src_port = s0->out2in.port; udp0->checksum = 0; if (PREDICT_FALSE (is_twice_nat_session (s0))) { udp0->dst_port = s0->ext_host_port; ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32; } } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace00: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat_in2out_ed_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = sw_if_index0; t->next_index = next0; t->session_index = ~0; if (s0) t->session_index = s0 - tsm->sessions; } pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP; next1 = NAT_IN2OUT_ED_NEXT_LOOKUP; if (is_output_feature) iph_offset1 = vnet_buffer (b1)->ip.save_rewrite_length; ip1 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b1) + iph_offset1); sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; rx_fib_index1 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index1); if (PREDICT_FALSE (ip1->ttl == 1)) { vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded, ICMP4_time_exceeded_ttl_exceeded_in_transit, 0); next1 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR; goto trace01; } udp1 = ip4_next_header (ip1); tcp1 = (tcp_header_t *) udp1; icmp1 = (icmp46_header_t *) udp1; proto1 = ip_proto_to_snat_proto (ip1->protocol); if (is_slow_path) { if (PREDICT_FALSE (proto1 == ~0)) { s1 = nat44_ed_in2out_unknown_proto (sm, b1, ip1, rx_fib_index1, thread_index, now, vm, node); if (!s1) next1 = NAT_IN2OUT_ED_NEXT_DROP; goto trace01; } if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) { next1 = icmp_in2out_ed_slow_path (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, next1, now, thread_index, &s1); goto trace01; } } else { if (PREDICT_FALSE (proto1 == ~0)) { next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace01; } if (ip4_is_fragment (ip1)) { next1 = NAT_IN2OUT_ED_NEXT_REASS; goto trace01; } if (is_output_feature) { if (PREDICT_FALSE (nat_not_translate_output_feature_fwd (sm, ip1, thread_index, now, vm, b1))) goto trace01; } if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) { next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace01; } } make_ed_kv (&kv1, &ip1->src_address, &ip1->dst_address, ip1->protocol, rx_fib_index1, udp1->src_port, udp1->dst_port); if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv1, &value1)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip1, ip1->protocol, udp1->src_port, udp1->dst_port, thread_index, sw_if_index1, vnet_buffer (b1)->sw_if_index[VLIB_TX]))) goto trace01; } else { if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index1, ip1, proto1, rx_fib_index1, thread_index))) goto trace01; } next1 = slow_path_ed (sm, b1, rx_fib_index1, &kv1, &s1, node, next1, thread_index, now); if (PREDICT_FALSE (next1 == NAT_IN2OUT_ED_NEXT_DROP)) goto trace01; if (PREDICT_FALSE (!s1)) goto trace01; } else { next1 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace01; } } else { s1 = pool_elt_at_index (tsm->sessions, value1.value); } b1->flags |= VNET_BUFFER_F_IS_NATED; if (!is_output_feature) vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index; old_addr1 = ip1->src_address.as_u32; new_addr1 = ip1->src_address.as_u32 = s1->out2in.addr.as_u32; sum1 = ip1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, src_address); if (PREDICT_FALSE (is_twice_nat_session (s1))) sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32, s1->ext_host_addr.as_u32, ip4_header_t, dst_address); ip1->checksum = ip_csum_fold (sum1); if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP)) { old_port1 = tcp1->src_port; new_port1 = tcp1->src_port = s1->out2in.port; sum1 = tcp1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address); sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t, length); if (PREDICT_FALSE (is_twice_nat_session (s1))) { sum1 = ip_csum_update (sum1, ip1->dst_address.as_u32, s1->ext_host_addr.as_u32, ip4_header_t, dst_address); sum1 = ip_csum_update (sum1, tcp1->dst_port, s1->ext_host_port, ip4_header_t, length); tcp1->dst_port = s1->ext_host_port; ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32; } tcp1->checksum = ip_csum_fold (sum1); mss_clamping (sm, tcp1, &sum1); if (nat44_set_tcp_session_state_i2o (sm, s1, tcp1, thread_index)) goto trace01; } else { udp1->src_port = s1->out2in.port; udp1->checksum = 0; if (PREDICT_FALSE (is_twice_nat_session (s1))) { udp1->dst_port = s1->ext_host_port; ip1->dst_address.as_u32 = s1->ext_host_addr.as_u32; } } /* Accounting */ nat44_session_update_counters (s1, now, vlib_buffer_length_in_chain (vm, b1)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s1, thread_index); trace01: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { nat_in2out_ed_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = sw_if_index1; t->next_index = next1; t->session_index = ~0; if (s1) t->session_index = s1 - tsm->sessions; } pkts_processed += next1 != NAT_IN2OUT_ED_NEXT_DROP; /* verify speculative enqueues, maybe switch current next frame */ vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0, sw_if_index0, rx_fib_index0, iph_offset0 = 0, proto0, new_addr0, old_addr0; u16 old_port0, new_port0; ip4_header_t *ip0; udp_header_t *udp0; tcp_header_t *tcp0; icmp46_header_t *icmp0; snat_session_t *s0 = 0; clib_bihash_kv_16_8_t kv0, value0; ip_csum_t sum0; /* 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); next0 = NAT_IN2OUT_ED_NEXT_LOOKUP; if (is_output_feature) iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length; ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + iph_offset0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0); if (PREDICT_FALSE (ip0->ttl == 1)) { vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded, ICMP4_time_exceeded_ttl_exceeded_in_transit, 0); next0 = NAT_IN2OUT_ED_NEXT_ICMP_ERROR; goto trace0; } udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_header_t *) udp0; proto0 = ip_proto_to_snat_proto (ip0->protocol); if (is_slow_path) { if (PREDICT_FALSE (proto0 == ~0)) { s0 = nat44_ed_in2out_unknown_proto (sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); if (!s0) next0 = NAT_IN2OUT_ED_NEXT_DROP; goto trace0; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_in2out_ed_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); goto trace0; } } else { if (PREDICT_FALSE (proto0 == ~0)) { next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace0; } if (ip4_is_fragment (ip0)) { next0 = NAT_IN2OUT_ED_NEXT_REASS; goto trace0; } if (is_output_feature) { if (PREDICT_FALSE (nat_not_translate_output_feature_fwd (sm, ip0, thread_index, now, vm, b0))) goto trace0; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace0; } } make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address, ip0->protocol, rx_fib_index0, udp0->src_port, udp0->dst_port); if (clib_bihash_search_16_8 (&tsm->in2out_ed, &kv0, &value0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip0, ip0->protocol, udp0->src_port, udp0->dst_port, thread_index, sw_if_index0, vnet_buffer (b0)->sw_if_index[VLIB_TX]))) goto trace0; } else { if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) goto trace0; } next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node, next0, thread_index, now); if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP)) goto trace0; if (PREDICT_FALSE (!s0)) goto trace0; } else { next0 = NAT_IN2OUT_ED_NEXT_SLOW_PATH; goto trace0; } } else { s0 = pool_elt_at_index (tsm->sessions, value0.value); } b0->flags |= VNET_BUFFER_F_IS_NATED; if (!is_output_feature) vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index; old_addr0 = ip0->src_address.as_u32; new_addr0 = ip0->src_address.as_u32 = s0->out2in.addr.as_u32; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, src_address); if (PREDICT_FALSE (is_twice_nat_session (s0))) sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32, s0->ext_host_addr.as_u32, ip4_header_t, dst_address); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->src_port; new_port0 = tcp0->src_port = s0->out2in.port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t, length); if (PREDICT_FALSE (is_twice_nat_session (s0))) { sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32, s0->ext_host_addr.as_u32, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, tcp0->dst_port, s0->ext_host_port, ip4_header_t, length); tcp0->dst_port = s0->ext_host_port; ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32; } mss_clamping (sm, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); if (nat44_set_tcp_session_state_i2o (sm, s0, tcp0, thread_index)) goto trace0; } else { udp0->src_port = s0->out2in.port; udp0->checksum = 0; if (PREDICT_FALSE (is_twice_nat_session (s0))) { udp0->dst_port = s0->ext_host_port; ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32; } } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat_in2out_ed_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = sw_if_index0; t->next_index = next0; t->session_index = ~0; if (s0) t->session_index = s0 - tsm->sessions; } pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP; /* 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); } vlib_node_increment_counter (vm, stats_node_index, NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS, pkts_processed); return frame->n_vectors; } static uword nat44_ed_in2out_fast_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_in2out_node) = { .function = nat44_ed_in2out_fast_path_fn, .name = "nat44-ed-in2out", .vector_size = sizeof (u32), .format_trace = format_nat_in2out_ed_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings), .error_strings = nat_in2out_ed_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = NAT_IN2OUT_ED_N_NEXT, .next_nodes = { [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop", [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup", [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath", [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_node, nat44_ed_in2out_fast_path_fn); static uword nat44_ed_in2out_output_fast_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_in2out_node_fn_inline (vm, node, frame, 0, 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_in2out_output_node) = { .function = nat44_ed_in2out_output_fast_path_fn, .name = "nat44-ed-in2out-output", .vector_size = sizeof (u32), .format_trace = format_nat_in2out_ed_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings), .error_strings = nat_in2out_ed_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = NAT_IN2OUT_ED_N_NEXT, .next_nodes = { [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop", [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output", [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath", [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass-output", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_node, nat44_ed_in2out_output_fast_path_fn); static uword nat44_ed_in2out_slow_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_in2out_slowpath_node) = { .function = nat44_ed_in2out_slow_path_fn, .name = "nat44-ed-in2out-slowpath", .vector_size = sizeof (u32), .format_trace = format_nat_in2out_ed_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings), .error_strings = nat_in2out_ed_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = NAT_IN2OUT_ED_N_NEXT, .next_nodes = { [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop", [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup", [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-slowpath", [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_slowpath_node, nat44_ed_in2out_slow_path_fn); static uword nat44_ed_in2out_output_slow_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_in2out_node_fn_inline (vm, node, frame, 1, 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_in2out_output_slowpath_node) = { .function = nat44_ed_in2out_output_slow_path_fn, .name = "nat44-ed-in2out-output-slowpath", .vector_size = sizeof (u32), .format_trace = format_nat_in2out_ed_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings), .error_strings = nat_in2out_ed_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = NAT_IN2OUT_ED_N_NEXT, .next_nodes = { [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop", [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output", [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-ed-in2out-output-slowpath", [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_output_slowpath_node, nat44_ed_in2out_output_slow_path_fn); static inline uword nat44_ed_in2out_reass_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_output_feature) { u32 n_left_from, *from, *to_next; nat_in2out_ed_next_t next_index; u32 pkts_processed = 0; snat_main_t *sm = &snat_main; f64 now = vlib_time_now (vm); u32 thread_index = vm->thread_index; snat_main_per_thread_data_t *per_thread_data = &sm->per_thread_data[thread_index]; u32 *fragments_to_drop = 0; u32 *fragments_to_loopback = 0; 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, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0; u32 iph_offset0 = 0; vlib_buffer_t *b0; u32 next0; u8 cached0 = 0; ip4_header_t *ip0 = 0; nat_reass_ip4_t *reass0; udp_header_t *udp0; tcp_header_t *tcp0; icmp46_header_t *icmp0; clib_bihash_kv_16_8_t kv0, value0; snat_session_t *s0 = 0; u16 old_port0, new_port0; ip_csum_t sum0; /* 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); next0 = NAT_IN2OUT_ED_NEXT_LOOKUP; sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0); if (PREDICT_FALSE (nat_reass_is_drop_frag (0))) { next0 = NAT_IN2OUT_ED_NEXT_DROP; b0->error = node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT]; goto trace0; } if (is_output_feature) iph_offset0 = vnet_buffer (b0)->ip.save_rewrite_length; ip0 = (ip4_header_t *) ((u8 *) vlib_buffer_get_current (b0) + iph_offset0); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_header_t *) udp0; proto0 = ip_proto_to_snat_proto (ip0->protocol); reass0 = nat_ip4_reass_find_or_create (ip0->src_address, ip0->dst_address, ip0->fragment_id, ip0->protocol, 1, &fragments_to_drop); if (PREDICT_FALSE (!reass0)) { next0 = NAT_IN2OUT_ED_NEXT_DROP; b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_REASS]; nat_log_notice ("maximum reassemblies exceeded"); goto trace0; } if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) { if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { if (is_output_feature) { if (PREDICT_FALSE (nat_not_translate_output_feature_fwd (sm, ip0, thread_index, now, vm, b0))) reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; goto trace0; } next0 = icmp_in2out_ed_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); if (PREDICT_TRUE (next0 != NAT_IN2OUT_ED_NEXT_DROP)) { if (s0) reass0->sess_index = s0 - per_thread_data->sessions; else reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); } goto trace0; } make_ed_kv (&kv0, &ip0->src_address, &ip0->dst_address, ip0->protocol, rx_fib_index0, udp0->src_port, udp0->dst_port); if (clib_bihash_search_16_8 (&per_thread_data->in2out_ed, &kv0, &value0)) { if (is_output_feature) { if (PREDICT_FALSE (nat44_ed_not_translate_output_feature (sm, ip0, ip0->protocol, udp0->src_port, udp0->dst_port, thread_index, sw_if_index0, vnet_buffer (b0)->sw_if_index[VLIB_TX]))) { reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); goto trace0; } } else { if (PREDICT_FALSE (nat44_ed_not_translate (sm, node, sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) { reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); goto trace0; } } next0 = slow_path_ed (sm, b0, rx_fib_index0, &kv0, &s0, node, next0, thread_index, now); if (PREDICT_FALSE (next0 == NAT_IN2OUT_ED_NEXT_DROP)) goto trace0; if (PREDICT_FALSE (!s0)) { reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; goto trace0; } reass0->sess_index = s0 - per_thread_data->sessions; } else { s0 = pool_elt_at_index (per_thread_data->sessions, value0.value); reass0->sess_index = value0.value; } nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); } else { if (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE) goto trace0; if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0)) { if (nat_ip4_reass_add_fragment (reass0, bi0, &fragments_to_drop)) { b0->error = node->errors[NAT_IN2OUT_ED_ERROR_MAX_FRAG]; nat_log_notice ("maximum fragments per reassembly exceeded"); next0 = NAT_IN2OUT_ED_NEXT_DROP; goto trace0; } cached0 = 1; goto trace0; } s0 = pool_elt_at_index (per_thread_data->sessions, reass0->sess_index); } old_addr0 = ip0->src_address.as_u32; ip0->src_address = s0->out2in.addr; new_addr0 = ip0->src_address.as_u32; if (!is_output_feature) vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->out2in.fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, src_address /* changed member */ ); if (PREDICT_FALSE (is_twice_nat_session (s0))) sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32, s0->ext_host_addr.as_u32, ip4_header_t, dst_address); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) { if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->src_port; tcp0->src_port = s0->out2in.port; new_port0 = tcp0->src_port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); if (PREDICT_FALSE (is_twice_nat_session (s0))) { sum0 = ip_csum_update (sum0, ip0->dst_address.as_u32, s0->ext_host_addr.as_u32, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, tcp0->dst_port, s0->ext_host_port, ip4_header_t, length); tcp0->dst_port = s0->ext_host_port; ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32; } tcp0->checksum = ip_csum_fold (sum0); } else { old_port0 = udp0->src_port; udp0->src_port = s0->out2in.port; udp0->checksum = 0; if (PREDICT_FALSE (is_twice_nat_session (s0))) { udp0->dst_port = s0->ext_host_port; ip0->dst_address.as_u32 = s0->ext_host_addr.as_u32; } } } /* Hairpinning */ nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port, s0->ext_host_port, proto0, 1); /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_reass_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->cached = cached0; t->sw_if_index = sw_if_index0; t->next_index = next0; } if (cached0) { n_left_to_next++; to_next--; } else { pkts_processed += next0 != NAT_IN2OUT_ED_NEXT_DROP; /* 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); } if (n_left_from == 0 && vec_len (fragments_to_loopback)) { from = vlib_frame_vector_args (frame); u32 len = vec_len (fragments_to_loopback); if (len <= VLIB_FRAME_SIZE) { clib_memcpy (from, fragments_to_loopback, sizeof (u32) * len); n_left_from = len; vec_reset_length (fragments_to_loopback); } else { clib_memcpy (from, fragments_to_loopback + (len - VLIB_FRAME_SIZE), sizeof (u32) * VLIB_FRAME_SIZE); n_left_from = VLIB_FRAME_SIZE; _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE; } } } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, nat44_ed_in2out_reass_node.index, NAT_IN2OUT_ED_ERROR_IN2OUT_PACKETS, pkts_processed); nat_send_all_to_node (vm, fragments_to_drop, node, &node->errors[NAT_IN2OUT_ED_ERROR_DROP_FRAGMENT], NAT_IN2OUT_ED_NEXT_DROP); vec_free (fragments_to_drop); vec_free (fragments_to_loopback); return frame->n_vectors; } static uword nat44_ed_in2out_reass_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_in2out_reass_node) = { .function = nat44_ed_in2out_reass_node_fn, .name = "nat44-ed-in2out-reass", .vector_size = sizeof (u32), .format_trace = format_nat44_reass_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings), .error_strings = nat_in2out_ed_error_strings, .n_next_nodes = NAT_IN2OUT_ED_N_NEXT, .next_nodes = { [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop", [NAT_IN2OUT_ED_NEXT_LOOKUP] = "ip4-lookup", [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_node, nat44_ed_in2out_reass_node_fn); static uword nat44_ed_in2out_reass_output_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_in2out_reass_node_fn_inline (vm, node, frame, 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_in2out_reass_output_node) = { .function = nat44_ed_in2out_reass_output_node_fn, .name = "nat44-ed-in2out-reass-output", .vector_size = sizeof (u32), .format_trace = format_nat44_reass_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN (nat_in2out_ed_error_strings), .error_strings = nat_in2out_ed_error_strings, .n_next_nodes = NAT_IN2OUT_ED_N_NEXT, .next_nodes = { [NAT_IN2OUT_ED_NEXT_DROP] = "error-drop", [NAT_IN2OUT_ED_NEXT_LOOKUP] = "interface-output", [NAT_IN2OUT_ED_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [NAT_IN2OUT_ED_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT_IN2OUT_ED_NEXT_REASS] = "nat44-ed-in2out-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_in2out_reass_output_node, nat44_ed_in2out_reass_output_node_fn); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */