/* * Copyright (c) 2016 Cisco and/or its affiliates. * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at: * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include typedef struct { u32 sw_if_index; u32 next_index; u32 session_index; u32 is_slow_path; } snat_in2out_trace_t; typedef struct { u32 next_worker_index; u8 do_handoff; } snat_in2out_worker_handoff_trace_t; /* packet trace format function */ static u8 * format_snat_in2out_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 *); snat_in2out_trace_t * t = va_arg (*args, snat_in2out_trace_t *); char * tag; tag = t->is_slow_path ? "NAT44_IN2OUT_SLOW_PATH" : "NAT44_IN2OUT_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 u8 * format_snat_in2out_fast_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 *); snat_in2out_trace_t * t = va_arg (*args, snat_in2out_trace_t *); s = format (s, "NAT44_IN2OUT_FAST: sw_if_index %d, next index %d", t->sw_if_index, t->next_index); return s; } static u8 * format_snat_in2out_worker_handoff_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 *); snat_in2out_worker_handoff_trace_t * t = va_arg (*args, snat_in2out_worker_handoff_trace_t *); char * m; m = t->do_handoff ? "next worker" : "same worker"; s = format (s, "NAT44_IN2OUT_WORKER_HANDOFF: %s %d", m, t->next_worker_index); return s; } typedef struct { u32 sw_if_index; u32 next_index; u8 cached; } nat44_in2out_reass_trace_t; static u8 * format_nat44_in2out_reass_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 *); nat44_in2out_reass_trace_t * t = va_arg (*args, nat44_in2out_reass_trace_t *); s = format (s, "NAT44_IN2OUT_REASS: sw_if_index %d, next index %d, status %s", t->sw_if_index, t->next_index, t->cached ? "cached" : "translated"); return s; } vlib_node_registration_t snat_in2out_node; vlib_node_registration_t snat_in2out_slowpath_node; vlib_node_registration_t snat_in2out_fast_node; vlib_node_registration_t snat_in2out_worker_handoff_node; vlib_node_registration_t snat_det_in2out_node; vlib_node_registration_t snat_in2out_output_node; vlib_node_registration_t snat_in2out_output_slowpath_node; vlib_node_registration_t snat_in2out_output_worker_handoff_node; vlib_node_registration_t snat_hairpin_dst_node; vlib_node_registration_t snat_hairpin_src_node; vlib_node_registration_t nat44_hairpinning_node; vlib_node_registration_t nat44_in2out_reass_node; #define foreach_snat_in2out_error \ _(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ _(IN2OUT_PACKETS, "Good in2out packets processed") \ _(OUT_OF_PORTS, "Out of ports") \ _(BAD_OUTSIDE_FIB, "Outside VRF ID not found") \ _(BAD_ICMP_TYPE, "unsupported ICMP type") \ _(NO_TRANSLATION, "No translation") \ _(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) SNAT_IN2OUT_ERROR_##sym, foreach_snat_in2out_error #undef _ SNAT_IN2OUT_N_ERROR, } snat_in2out_error_t; static char * snat_in2out_error_strings[] = { #define _(sym,string) string, foreach_snat_in2out_error #undef _ }; typedef enum { SNAT_IN2OUT_NEXT_LOOKUP, SNAT_IN2OUT_NEXT_DROP, SNAT_IN2OUT_NEXT_ICMP_ERROR, SNAT_IN2OUT_NEXT_SLOW_PATH, SNAT_IN2OUT_NEXT_REASS, SNAT_IN2OUT_N_NEXT, } snat_in2out_next_t; typedef enum { SNAT_HAIRPIN_SRC_NEXT_DROP, SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT, SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH, SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT, SNAT_HAIRPIN_SRC_N_NEXT, } snat_hairpin_next_t; /** * @brief Check if packet should be translated * * Packets aimed at outside interface and external addresss with active session * should be translated. * * @param sm NAT main * @param rt NAT runtime data * @param sw_if_index0 index of the inside interface * @param ip0 IPv4 header * @param proto0 NAT protocol * @param rx_fib_index0 RX FIB index * * @returns 0 if packet should be translated otherwise 1 */ static inline int snat_not_translate_fast (snat_main_t * sm, vlib_node_runtime_t *node, u32 sw_if_index0, ip4_header_t * ip0, u32 proto0, u32 rx_fib_index0) { 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 = ip0->dst_address.as_u32, }, }; /* Don't NAT packet aimed at the intfc address */ if (PREDICT_FALSE(is_interface_addr(sm, node, sw_if_index0, ip0->dst_address.as_u32))) return 1; fei = fib_table_lookup (rx_fib_index0, &pfx); if (FIB_NODE_INDEX_INVALID != fei) { u32 sw_if_index = fib_entry_get_resolving_interface (fei); if (sw_if_index == ~0) { fei = fib_table_lookup (sm->outside_fib_index, &pfx); if (FIB_NODE_INDEX_INVALID != fei) sw_if_index = fib_entry_get_resolving_interface (fei); } snat_interface_t *i; pool_foreach (i, sm->interfaces, ({ /* NAT packet aimed at outside interface */ if ((nat_interface_is_outside(i)) && (sw_if_index == i->sw_if_index)) return 0; })); } return 1; } static inline int snat_not_translate (snat_main_t * sm, vlib_node_runtime_t *node, u32 sw_if_index0, ip4_header_t * ip0, u32 proto0, u32 rx_fib_index0, u32 thread_index) { udp_header_t * udp0 = ip4_next_header (ip0); snat_session_key_t key0, sm0; clib_bihash_kv_8_8_t kv0, value0; key0.addr = ip0->dst_address; key0.port = udp0->dst_port; key0.protocol = proto0; key0.fib_index = sm->outside_fib_index; kv0.key = key0.as_u64; /* NAT packet aimed at external address if */ /* has active sessions */ if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) { /* or is static mappings */ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0)) return 0; } else return 0; if (sm->forwarding_enabled) return 1; return snat_not_translate_fast(sm, node, sw_if_index0, ip0, proto0, rx_fib_index0); } static inline int nat_not_translate_output_feature (snat_main_t * sm, ip4_header_t * ip0, u32 proto0, u16 src_port, u32 thread_index) { snat_session_key_t key0; clib_bihash_kv_8_8_t kv0, value0; key0.addr = ip0->src_address; key0.port = src_port; key0.protocol = proto0; key0.fib_index = sm->outside_fib_index; kv0.key = key0.as_u64; if (!clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) return 1; return 0; } static u32 slow_path (snat_main_t *sm, vlib_buffer_t *b0, ip4_header_t * ip0, u32 rx_fib_index0, snat_session_key_t * key0, snat_session_t ** sessionp, vlib_node_runtime_t * node, u32 next0, u32 thread_index) { snat_user_t *u; snat_session_t *s; clib_bihash_kv_8_8_t kv0; snat_session_key_t key1; u32 address_index = ~0; u32 outside_fib_index; uword * p; udp_header_t * udp0 = ip4_next_header (ip0); u8 is_sm = 0; if (PREDICT_FALSE (maximum_sessions_exceeded(sm, thread_index))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; return SNAT_IN2OUT_NEXT_DROP; } p = hash_get (sm->ip4_main->fib_index_by_table_id, sm->outside_vrf_id); if (! p) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_OUTSIDE_FIB]; return SNAT_IN2OUT_NEXT_DROP; } outside_fib_index = p[0]; key1.protocol = key0->protocol; u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0, thread_index); if (!u) { clib_warning ("create NAT user failed"); return SNAT_IN2OUT_NEXT_DROP; } /* First try to match static mapping by local address and port */ if (snat_static_mapping_match (sm, *key0, &key1, 0, 0, 0)) { /* Try to create dynamic translation */ if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0, thread_index, &key1, &address_index, sm->port_per_thread, sm->per_thread_data[thread_index].snat_thread_index)) { b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; return SNAT_IN2OUT_NEXT_DROP; } } else is_sm = 1; s = nat_session_alloc_or_recycle (sm, u, thread_index); if (!s) { clib_warning ("create NAT session failed"); return SNAT_IN2OUT_NEXT_DROP; } if (is_sm) s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; user_session_increment (sm, u, is_sm); s->outside_address_index = address_index; s->in2out = *key0; s->out2in = key1; s->out2in.protocol = key0->protocol; s->out2in.fib_index = outside_fib_index; s->ext_host_addr.as_u32 = ip0->dst_address.as_u32; s->ext_host_port = udp0->dst_port; *sessionp = s; /* Add to translation hashes */ kv0.key = s->in2out.as_u64; kv0.value = s - sm->per_thread_data[thread_index].sessions; if (clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, 1 /* is_add */)) clib_warning ("in2out key add failed"); kv0.key = s->out2in.as_u64; kv0.value = s - sm->per_thread_data[thread_index].sessions; if (clib_bihash_add_del_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, 1 /* is_add */)) clib_warning ("out2in key add failed"); /* 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 next0; } static_always_inline snat_in2out_error_t icmp_get_key(ip4_header_t *ip0, snat_session_key_t *p_key0) { icmp46_header_t *icmp0; snat_session_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.protocol = SNAT_PROTOCOL_ICMP; key0.addr = ip0->src_address; key0.port = echo0->identifier; } else { inner_ip0 = (ip4_header_t *)(echo0+1); l4_header = ip4_next_header (inner_ip0); key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol); key0.addr = inner_ip0->dst_address; switch (key0.protocol) { case SNAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t*)l4_header; inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1); key0.port = inner_echo0->identifier; break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: key0.port = ((tcp_udp_header_t*)l4_header)->dst_port; break; default: return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL; } } *p_key0 = key0; return -1; /* success */ } 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 = key0.r_port = echo0->identifier; } 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 = 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 SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL; } } *p_key0 = key0; return 0; } /** * Get address and port values to be used for ICMP packet translation * and create session if needed * * @param[in,out] sm NAT main * @param[in,out] node NAT node runtime * @param[in] thread_index thread index * @param[in,out] b0 buffer containing packet to be translated * @param[out] p_proto protocol used for matching * @param[out] p_value address and port after NAT translation * @param[out] p_dont_translate if packet should not be translated * @param d optional parameter * @param e optional parameter */ u32 icmp_match_in2out_slow(snat_main_t *sm, vlib_node_runtime_t *node, u32 thread_index, vlib_buffer_t *b0, ip4_header_t *ip0, u8 *p_proto, snat_session_key_t *p_value, u8 *p_dont_translate, void *d, void *e) { icmp46_header_t *icmp0; u32 sw_if_index0; u32 rx_fib_index0; snat_session_key_t key0; snat_session_t *s0 = 0; u8 dont_translate = 0; clib_bihash_kv_8_8_t kv0, value0; u32 next0 = ~0; int err; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); err = icmp_get_key (ip0, &key0); if (err != -1) { b0->error = node->errors[err]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, &value0)) { if (vnet_buffer(b0)->sw_if_index[VLIB_TX] != ~0) { if (PREDICT_FALSE(nat_not_translate_output_feature(sm, ip0, SNAT_PROTOCOL_ICMP, key0.port, thread_index))) { dont_translate = 1; goto out; } } else { if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, ip0, SNAT_PROTOCOL_ICMP, rx_fib_index0, thread_index))) { dont_translate = 1; goto out; } } if (PREDICT_FALSE(icmp_is_error_message (icmp0))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0, thread_index); if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) goto out; } else { if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request && icmp0->type != ICMP4_echo_reply && !icmp_is_error_message (icmp0))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } if (PREDICT_FALSE (value0.value == ~0ULL)) { nat_ed_ses_key_t key; clib_bihash_kv_16_8_t s_kv, s_value; key.as_u64[0] = 0; key.as_u64[1] = 0; if (icmp_get_ed_key (ip0, &key)) { b0->error = node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } key.fib_index = rx_fib_index0; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; if (!clib_bihash_search_16_8 (&sm->in2out_ed, &s_kv, &s_value)) s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, s_value.value); else { next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } } else s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, value0.value); } out: *p_proto = key0.protocol; if (s0) *p_value = s0->out2in; *p_dont_translate = dont_translate; if (d) *(snat_session_t**)d = s0; return next0; } /** * Get address and port values to be used for ICMP packet translation * * @param[in] sm NAT main * @param[in,out] node NAT node runtime * @param[in] thread_index thread index * @param[in,out] b0 buffer containing packet to be translated * @param[out] p_proto protocol used for matching * @param[out] p_value address and port after NAT translation * @param[out] p_dont_translate if packet should not be translated * @param d optional parameter * @param e optional parameter */ u32 icmp_match_in2out_fast(snat_main_t *sm, vlib_node_runtime_t *node, u32 thread_index, vlib_buffer_t *b0, ip4_header_t *ip0, u8 *p_proto, snat_session_key_t *p_value, u8 *p_dont_translate, void *d, void *e) { icmp46_header_t *icmp0; u32 sw_if_index0; u32 rx_fib_index0; snat_session_key_t key0; snat_session_key_t sm0; u8 dont_translate = 0; u8 is_addr_only; u32 next0 = ~0; int err; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); err = icmp_get_key (ip0, &key0); if (err != -1) { b0->error = node->errors[err]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out2; } key0.fib_index = rx_fib_index0; if (snat_static_mapping_match(sm, key0, &sm0, 0, &is_addr_only, 0)) { if (PREDICT_FALSE(snat_not_translate_fast(sm, node, sw_if_index0, ip0, IP_PROTOCOL_ICMP, rx_fib_index0))) { dont_translate = 1; goto out; } if (icmp_is_error_message (icmp0)) { next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request && (icmp0->type != ICMP4_echo_reply || !is_addr_only) && !icmp_is_error_message (icmp0))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } out: *p_value = sm0; out2: *p_proto = key0.protocol; *p_dont_translate = dont_translate; return next0; } static inline u32 icmp_in2out (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, u32 thread_index, void *d, void *e) { snat_session_key_t sm0; u8 protocol; icmp_echo_header_t *echo0, *inner_echo0 = 0; ip4_header_t *inner_ip0; void *l4_header = 0; icmp46_header_t *inner_icmp0; u8 dont_translate; u32 new_addr0, old_addr0; u16 old_id0, new_id0; ip_csum_t sum0; u16 checksum0; u32 next0_tmp; echo0 = (icmp_echo_header_t *)(icmp0+1); next0_tmp = sm->icmp_match_in2out_cb(sm, node, thread_index, b0, ip0, &protocol, &sm0, &dont_translate, d, e); if (next0_tmp != ~0) next0 = next0_tmp; if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate) goto out; sum0 = ip_incremental_checksum (0, icmp0, ntohs(ip0->length) - ip4_header_bytes (ip0)); checksum0 = ~ip_csum_fold (sum0); if (PREDICT_FALSE(checksum0 != 0 && checksum0 != 0xffff)) { next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } old_addr0 = ip0->src_address.as_u32; new_addr0 = ip0->src_address.as_u32 = sm0.addr.as_u32; if (vnet_buffer(b0)->sw_if_index[VLIB_TX] == ~0) vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, src_address /* changed member */); ip0->checksum = ip_csum_fold (sum0); if (icmp0->checksum == 0) icmp0->checksum = 0xffff; if (!icmp_is_error_message (icmp0)) { new_id0 = sm0.port; if (PREDICT_FALSE(new_id0 != echo0->identifier)) { old_id0 = echo0->identifier; new_id0 = sm0.port; echo0->identifier = new_id0; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, identifier); icmp0->checksum = ip_csum_fold (sum0); } } else { inner_ip0 = (ip4_header_t *)(echo0+1); l4_header = ip4_next_header (inner_ip0); if (!ip4_header_checksum_is_valid (inner_ip0)) { next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } old_addr0 = inner_ip0->dst_address.as_u32; inner_ip0->dst_address = sm0.addr; new_addr0 = inner_ip0->dst_address.as_u32; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */); icmp0->checksum = ip_csum_fold (sum0); switch (protocol) { case SNAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t*)l4_header; inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1); old_id0 = inner_echo0->identifier; new_id0 = sm0.port; inner_echo0->identifier = new_id0; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, identifier); icmp0->checksum = ip_csum_fold (sum0); break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: old_id0 = ((tcp_udp_header_t*)l4_header)->dst_port; new_id0 = sm0.port; ((tcp_udp_header_t*)l4_header)->dst_port = new_id0; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t, dst_port); icmp0->checksum = ip_csum_fold (sum0); break; default: ASSERT(0); } } out: return next0; } /** * @brief Hairpinning * * Hairpinning allows two endpoints on the internal side of the NAT to * communicate even if they only use each other's external IP addresses * and ports. * * @param sm NAT main. * @param b0 Vlib buffer. * @param ip0 IP header. * @param udp0 UDP header. * @param tcp0 TCP header. * @param proto0 NAT protocol. */ static inline int snat_hairpinning (snat_main_t *sm, vlib_buffer_t * b0, ip4_header_t * ip0, udp_header_t * udp0, tcp_header_t * tcp0, u32 proto0) { snat_session_key_t key0, sm0; snat_session_t * s0; clib_bihash_kv_8_8_t kv0, value0; ip_csum_t sum0; u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si; u16 new_dst_port0, old_dst_port0; key0.addr = ip0->dst_address; key0.port = udp0->dst_port; key0.protocol = proto0; key0.fib_index = sm->outside_fib_index; kv0.key = key0.as_u64; /* Check if destination is static mappings */ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0)) { new_dst_addr0 = sm0.addr.as_u32; new_dst_port0 = sm0.port; vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; } /* or active session */ else { if (sm->num_workers > 1) ti = (clib_net_to_host_u16 (udp0->dst_port) - 1024) / sm->port_per_thread; else ti = sm->num_workers; if (!clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0, &value0)) { si = value0.value; s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si); new_dst_addr0 = s0->in2out.addr.as_u32; new_dst_port0 = s0->in2out.port; vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; } } /* Destination is behind the same NAT, use internal address and port */ if (new_dst_addr0) { old_dst_addr0 = ip0->dst_address.as_u32; ip0->dst_address.as_u32 = new_dst_addr0; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, ip4_header_t, dst_address); ip0->checksum = ip_csum_fold (sum0); old_dst_port0 = tcp0->dst; if (PREDICT_TRUE(new_dst_port0 != old_dst_port0)) { if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { tcp0->dst = new_dst_port0; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0, ip4_header_t /* cheat */, length); tcp0->checksum = ip_csum_fold(sum0); } else { udp0->dst_port = new_dst_port0; udp0->checksum = 0; } } else { if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, ip4_header_t, dst_address); tcp0->checksum = ip_csum_fold(sum0); } } return 1; } return 0; } static inline void snat_icmp_hairpinning (snat_main_t *sm, vlib_buffer_t * b0, ip4_header_t * ip0, icmp46_header_t * icmp0) { snat_session_key_t key0, sm0; clib_bihash_kv_8_8_t kv0, value0; u32 new_dst_addr0 = 0, old_dst_addr0, si, ti = 0; ip_csum_t sum0; snat_session_t *s0; if (!icmp_is_error_message (icmp0)) { icmp_echo_header_t *echo0 = (icmp_echo_header_t *)(icmp0+1); u16 icmp_id0 = echo0->identifier; key0.addr = ip0->dst_address; key0.port = icmp_id0; key0.protocol = SNAT_PROTOCOL_ICMP; key0.fib_index = sm->outside_fib_index; kv0.key = key0.as_u64; if (sm->num_workers > 1) ti = (clib_net_to_host_u16 (icmp_id0) - 1024) / sm->port_per_thread; else ti = sm->num_workers; /* Check if destination is in active sessions */ if (clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0, &value0)) { /* or static mappings */ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0)) { new_dst_addr0 = sm0.addr.as_u32; vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; } } else { si = value0.value; s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si); new_dst_addr0 = s0->in2out.addr.as_u32; vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; echo0->identifier = s0->in2out.port; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, icmp_id0, s0->in2out.port, icmp_echo_header_t, identifier); icmp0->checksum = ip_csum_fold (sum0); } /* Destination is behind the same NAT, use internal address and port */ if (new_dst_addr0) { old_dst_addr0 = ip0->dst_address.as_u32; ip0->dst_address.as_u32 = new_dst_addr0; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, ip4_header_t, dst_address); ip0->checksum = ip_csum_fold (sum0); } } } static inline u32 icmp_in2out_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 != SNAT_IN2OUT_NEXT_DROP && s0)) { /* Hairpinning */ if (vnet_buffer(b0)->sw_if_index[VLIB_TX] == 0) snat_icmp_hairpinning(sm, b0, ip0, icmp0); /* Accounting */ s0->last_heard = now; s0->total_pkts++; s0->total_bytes += vlib_buffer_length_in_chain (sm->vlib_main, b0); /* Per-user LRU list maintenance */ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, s0->per_user_index); clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, s0->per_user_list_head_index, s0->per_user_index); } return next0; } static inline void snat_hairpinning_unknown_proto (snat_main_t *sm, vlib_buffer_t * b, ip4_header_t * ip) { u32 old_addr, new_addr = 0, ti = 0; clib_bihash_kv_8_8_t kv, value; clib_bihash_kv_16_8_t s_kv, s_value; nat_ed_ses_key_t key; snat_session_key_t m_key; snat_static_mapping_t *m; ip_csum_t sum; snat_session_t *s; old_addr = ip->dst_address.as_u32; key.l_addr.as_u32 = ip->dst_address.as_u32; key.r_addr.as_u32 = ip->src_address.as_u32; key.fib_index = sm->outside_fib_index; key.proto = ip->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)) { m_key.addr = ip->dst_address; m_key.fib_index = sm->outside_fib_index; m_key.port = 0; m_key.protocol = 0; kv.key = m_key.as_u64; if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) return; m = pool_elt_at_index (sm->static_mappings, value.value); if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0) vnet_buffer(b)->sw_if_index[VLIB_TX] = m->fib_index; new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32; } else { if (sm->num_workers > 1) ti = sm->worker_out2in_cb (ip, sm->outside_fib_index); else ti = sm->num_workers; s = pool_elt_at_index (sm->per_thread_data[ti].sessions, s_value.value); if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0) vnet_buffer(b)->sw_if_index[VLIB_TX] = s->in2out.fib_index; new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32; } sum = ip->checksum; sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, dst_address); ip->checksum = ip_csum_fold (sum); } static snat_session_t * snat_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; snat_session_key_t m_key; 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; nat_ed_ses_key_t key; u32 address_index = ~0; int i; u8 is_sm = 0; old_addr = ip->src_address.as_u32; key.l_addr = ip->src_address; key.r_addr = ip->dst_address; key.fib_index = rx_fib_index; key.proto = ip->protocol; key.l_port = 0; key.r_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->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[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; return 0; } u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index, thread_index); if (!u) { clib_warning ("create NAT user failed"); return 0; } m_key.addr = ip->src_address; m_key.port = 0; m_key.protocol = 0; m_key.fib_index = rx_fib_index; kv.key = m_key.as_u64; /* 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 */ if (!clib_bihash_search_8_8 (&tsm->user_hash, &kv, &value)) { 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_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; address_index = s->outside_address_index; key.fib_index = sm->outside_fib_index; key.l_addr.as_u32 = new_addr; 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)) break; goto create_ses; } } } key.fib_index = sm->outside_fib_index; for (i = 0; i < vec_len (sm->addresses); i++) { key.l_addr.as_u32 = sm->addresses[i].addr.as_u32; 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)) { new_addr = ip->src_address.as_u32 = key.l_addr.as_u32; address_index = i; goto create_ses; } } return 0; } create_ses: s = nat_session_alloc_or_recycle (sm, u, thread_index); if (!s) { clib_warning ("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->outside_address_index = address_index; s->out2in.addr.as_u32 = new_addr; s->out2in.fib_index = sm->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 */ key.l_addr.as_u32 = old_addr; key.r_addr = ip->dst_address; key.proto = ip->protocol; key.fib_index = rx_fib_index; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; s_kv.value = s - tsm->sessions; if (clib_bihash_add_del_16_8 (&sm->in2out_ed, &s_kv, 1)) clib_warning ("in2out key add failed"); key.l_addr.as_u32 = new_addr; key.fib_index = sm->outside_fib_index; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1)) clib_warning ("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 */ s->last_heard = now; s->total_pkts++; s->total_bytes += vlib_buffer_length_in_chain (vm, b); /* Per-user LRU list maintenance */ clib_dlist_remove (tsm->list_pool, s->per_user_index); clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, s->per_user_index); /* Hairpinning */ if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0) snat_hairpinning_unknown_proto(sm, b, ip); if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0) vnet_buffer(b)->sw_if_index[VLIB_TX] = sm->outside_fib_index; return s; } static snat_session_t * snat_in2out_lb (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) { nat_ed_ses_key_t key; clib_bihash_kv_16_8_t s_kv, s_value; udp_header_t *udp = ip4_next_header (ip); tcp_header_t *tcp = (tcp_header_t *) udp; snat_session_t *s = 0; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; u32 old_addr, new_addr; u16 new_port, old_port; ip_csum_t sum; u32 proto = ip_proto_to_snat_proto (ip->protocol); snat_session_key_t e_key, l_key; snat_user_t *u; old_addr = ip->src_address.as_u32; key.l_addr = ip->src_address; key.r_addr = ip->dst_address; key.fib_index = rx_fib_index; key.proto = ip->protocol; key.r_port = udp->dst_port; key.l_port = udp->src_port; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; if (!clib_bihash_search_16_8 (&sm->in2out_ed, &s_kv, &s_value)) { s = pool_elt_at_index (tsm->sessions, s_value.value); } else { if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) { b->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; return 0; } l_key.addr = ip->src_address; l_key.port = udp->src_port; l_key.protocol = proto; l_key.fib_index = rx_fib_index; if (snat_static_mapping_match(sm, l_key, &e_key, 0, 0, 0)) return 0; u = nat_user_get_or_create (sm, &ip->src_address, rx_fib_index, thread_index); if (!u) { clib_warning ("create NAT user failed"); return 0; } s = nat_session_alloc_or_recycle (sm, u, thread_index); if (!s) { clib_warning ("create NAT session failed"); return 0; } s->ext_host_addr.as_u32 = ip->dst_address.as_u32; s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING; s->outside_address_index = ~0; s->in2out = l_key; s->out2in = e_key; s->out2in.protocol = l_key.protocol; user_session_increment (sm, u, 1 /* static */); /* Add to lookup tables */ s_kv.value = s - tsm->sessions; if (clib_bihash_add_del_16_8 (&sm->in2out_ed, &s_kv, 1)) clib_warning ("in2out-ed key add failed"); key.l_addr = e_key.addr; key.fib_index = e_key.fib_index; key.l_port = e_key.port; s_kv.key[0] = key.as_u64[0]; s_kv.key[1] = key.as_u64[1]; if (clib_bihash_add_del_16_8 (&sm->out2in_ed, &s_kv, 1)) clib_warning ("out2in-ed key add failed"); } new_addr = ip->src_address.as_u32 = s->out2in.addr.as_u32; /* Update IP checksum */ sum = ip->checksum; sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address); if (is_twice_nat_session (s)) sum = ip_csum_update (sum, ip->dst_address.as_u32, s->ext_host_addr.as_u32, ip4_header_t, dst_address); ip->checksum = ip_csum_fold (sum); if (PREDICT_TRUE(proto == SNAT_PROTOCOL_TCP)) { old_port = tcp->src_port; tcp->src_port = s->out2in.port; new_port = tcp->src_port; sum = tcp->checksum; sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address); sum = ip_csum_update (sum, old_port, new_port, ip4_header_t, length); if (is_twice_nat_session (s)) { sum = ip_csum_update (sum, ip->dst_address.as_u32, s->ext_host_addr.as_u32, ip4_header_t, dst_address); sum = ip_csum_update (sum, tcp->dst_port, s->ext_host_port, ip4_header_t, length); tcp->dst_port = s->ext_host_port; ip->dst_address.as_u32 = s->ext_host_addr.as_u32; } tcp->checksum = ip_csum_fold(sum); } else { udp->src_port = s->out2in.port; if (is_twice_nat_session (s)) { udp->dst_port = s->ext_host_port; ip->dst_address.as_u32 = s->ext_host_addr.as_u32; } udp->checksum = 0; } if (vnet_buffer(b)->sw_if_index[VLIB_TX] == ~0) vnet_buffer(b)->sw_if_index[VLIB_TX] = sm->outside_fib_index; /* Accounting */ s->last_heard = now; s->total_pkts++; s->total_bytes += vlib_buffer_length_in_chain (vm, b); /* Per-user LRU list maintenance */ clib_dlist_remove (tsm->list_pool, s->per_user_index); clib_dlist_addtail (tsm->list_pool, s->per_user_list_head_index, s->per_user_index); return s; } static inline uword snat_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; snat_in2out_next_t next_index; u32 pkts_processed = 0; snat_main_t * sm = &snat_main; f64 now = vlib_time_now (vm); u32 stats_node_index; u32 thread_index = vlib_get_thread_index (); stats_node_index = is_slow_path ? snat_in2out_slowpath_node.index : snat_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, next1; u32 sw_if_index0, sw_if_index1; ip4_header_t * ip0, * ip1; ip_csum_t sum0, sum1; u32 new_addr0, old_addr0, new_addr1, old_addr1; u16 old_port0, new_port0, old_port1, new_port1; udp_header_t * udp0, * udp1; tcp_header_t * tcp0, * tcp1; icmp46_header_t * icmp0, * icmp1; snat_session_key_t key0, key1; u32 rx_fib_index0, rx_fib_index1; u32 proto0, proto1; snat_session_t * s0 = 0, * s1 = 0; clib_bihash_kv_8_8_t kv0, value0, kv1, value1; u32 iph_offset0 = 0, iph_offset1 = 0; /* 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); 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; sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index, sw_if_index0); next0 = next1 = SNAT_IN2OUT_NEXT_LOOKUP; 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace00; } proto0 = ip_proto_to_snat_proto (ip0->protocol); /* Next configured feature, probably ip4-lookup */ if (is_slow_path) { if (PREDICT_FALSE (proto0 == ~0)) { s0 = snat_in2out_unknown_proto (sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); if (!s0) next0 = SNAT_IN2OUT_NEXT_DROP; goto trace00; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_in2out_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 || proto0 == SNAT_PROTOCOL_ICMP)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace00; } if (ip4_is_fragment (ip0)) { next0 = SNAT_IN2OUT_NEXT_REASS; goto trace00; } } key0.addr = ip0->src_address; key0.port = udp0->src_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (PREDICT_FALSE (clib_bihash_search_8_8 ( &sm->per_thread_data[thread_index].in2out, &kv0, &value0) != 0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE(nat_not_translate_output_feature(sm, ip0, proto0, udp0->src_port, thread_index))) goto trace00; } else { if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) goto trace00; } next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0, thread_index); if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) goto trace00; } else { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace00; } } else { if (PREDICT_FALSE (value0.value == ~0ULL)) { if (is_slow_path) { s0 = snat_in2out_lb(sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); if (!s0) next0 = SNAT_IN2OUT_NEXT_DROP; goto trace00; } else { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace00; } } else { s0 = pool_elt_at_index ( sm->per_thread_data[thread_index].sessions, value0.value); } } b0->flags |= VNET_BUFFER_F_IS_NATED; 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 */); ip0->checksum = ip_csum_fold (sum0); 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 */); tcp0->checksum = ip_csum_fold(sum0); } else { old_port0 = udp0->src_port; udp0->src_port = s0->out2in.port; udp0->checksum = 0; } /* Accounting */ s0->last_heard = now; s0->total_pkts++; s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); /* Per-user LRU list maintenance */ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, s0->per_user_index); clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, s0->per_user_list_head_index, s0->per_user_index); trace00: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_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 - sm->per_thread_data[thread_index].sessions; } pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP; 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); udp1 = ip4_next_header (ip1); tcp1 = (tcp_header_t *) udp1; icmp1 = (icmp46_header_t *) udp1; sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX]; rx_fib_index1 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index, 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace01; } proto1 = ip_proto_to_snat_proto (ip1->protocol); /* Next configured feature, probably ip4-lookup */ if (is_slow_path) { if (PREDICT_FALSE (proto1 == ~0)) { s1 = snat_in2out_unknown_proto (sm, b1, ip1, rx_fib_index1, thread_index, now, vm, node); if (!s1) next1 = SNAT_IN2OUT_NEXT_DROP; goto trace01; } if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) { next1 = icmp_in2out_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 || proto1 == SNAT_PROTOCOL_ICMP)) { next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace01; } if (ip4_is_fragment (ip1)) { next1 = SNAT_IN2OUT_NEXT_REASS; goto trace01; } } b1->flags |= VNET_BUFFER_F_IS_NATED; key1.addr = ip1->src_address; key1.port = udp1->src_port; key1.protocol = proto1; key1.fib_index = rx_fib_index1; kv1.key = key1.as_u64; if (PREDICT_FALSE(clib_bihash_search_8_8 ( &sm->per_thread_data[thread_index].in2out, &kv1, &value1) != 0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE(nat_not_translate_output_feature(sm, ip1, proto1, udp1->src_port, thread_index))) goto trace01; } else { if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index1, ip1, proto1, rx_fib_index1, thread_index))) goto trace01; } next1 = slow_path (sm, b1, ip1, rx_fib_index1, &key1, &s1, node, next1, thread_index); if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP)) goto trace01; } else { next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace01; } } else { if (PREDICT_FALSE (value1.value == ~0ULL)) { if (is_slow_path) { s1 = snat_in2out_lb(sm, b1, ip1, rx_fib_index1, thread_index, now, vm, node); if (!s1) next1 = SNAT_IN2OUT_NEXT_DROP; goto trace01; } else { next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace01; } } else { s1 = pool_elt_at_index ( sm->per_thread_data[thread_index].sessions, value1.value); } } old_addr1 = ip1->src_address.as_u32; ip1->src_address = s1->out2in.addr; new_addr1 = ip1->src_address.as_u32; if (!is_output_feature) vnet_buffer(b1)->sw_if_index[VLIB_TX] = s1->out2in.fib_index; sum1 = ip1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, src_address /* changed member */); ip1->checksum = ip_csum_fold (sum1); if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP)) { old_port1 = tcp1->src_port; tcp1->src_port = s1->out2in.port; new_port1 = tcp1->src_port; sum1 = tcp1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */); sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t /* cheat */, length /* changed member */); tcp1->checksum = ip_csum_fold(sum1); } else { old_port1 = udp1->src_port; udp1->src_port = s1->out2in.port; udp1->checksum = 0; } /* Accounting */ s1->last_heard = now; s1->total_pkts++; s1->total_bytes += vlib_buffer_length_in_chain (vm, b1); /* Per-user LRU list maintenance */ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, s1->per_user_index); clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, s1->per_user_list_head_index, s1->per_user_index); trace01: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->sw_if_index = sw_if_index1; t->next_index = next1; t->session_index = ~0; if (s1) t->session_index = s1 - sm->per_thread_data[thread_index].sessions; } pkts_processed += next1 != SNAT_IN2OUT_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; u32 sw_if_index0; ip4_header_t * ip0; ip_csum_t sum0; u32 new_addr0, old_addr0; u16 old_port0, new_port0; udp_header_t * udp0; tcp_header_t * tcp0; icmp46_header_t * icmp0; snat_session_key_t key0; u32 rx_fib_index0; u32 proto0; snat_session_t * s0 = 0; clib_bihash_kv_8_8_t kv0, value0; u32 iph_offset0 = 0; /* 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 = SNAT_IN2OUT_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); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_header_t *) udp0; sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = vec_elt (sm->ip4_main->fib_index_by_sw_if_index, 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace0; } proto0 = ip_proto_to_snat_proto (ip0->protocol); /* Next configured feature, probably ip4-lookup */ if (is_slow_path) { if (PREDICT_FALSE (proto0 == ~0)) { s0 = snat_in2out_unknown_proto (sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); if (!s0) next0 = SNAT_IN2OUT_NEXT_DROP; goto trace0; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_in2out_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 || proto0 == SNAT_PROTOCOL_ICMP)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace0; } if (ip4_is_fragment (ip0)) { next0 = SNAT_IN2OUT_NEXT_REASS; goto trace0; } } key0.addr = ip0->src_address; key0.port = udp0->src_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, &value0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE(nat_not_translate_output_feature(sm, ip0, proto0, udp0->src_port, thread_index))) goto trace0; } else { if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) goto trace0; } next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0, thread_index); if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) goto trace0; } else { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace0; } } else { if (PREDICT_FALSE (value0.value == ~0ULL)) { if (is_slow_path) { s0 = snat_in2out_lb(sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); if (!s0) next0 = SNAT_IN2OUT_NEXT_DROP; goto trace0; } else { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace0; } } else { s0 = pool_elt_at_index ( sm->per_thread_data[thread_index].sessions, value0.value); } } b0->flags |= VNET_BUFFER_F_IS_NATED; 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 */); ip0->checksum = ip_csum_fold (sum0); 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 */); tcp0->checksum = ip_csum_fold(sum0); } else { old_port0 = udp0->src_port; udp0->src_port = s0->out2in.port; udp0->checksum = 0; } /* Accounting */ s0->last_heard = now; s0->total_pkts++; s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); /* Per-user LRU list maintenance */ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, s0->per_user_index); clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, s0->per_user_list_head_index, s0->per_user_index); trace0: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_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 - sm->per_thread_data[thread_index].sessions; } pkts_processed += next0 != SNAT_IN2OUT_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, SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, pkts_processed); return frame->n_vectors; } static uword snat_in2out_fast_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */, 0); } VLIB_REGISTER_NODE (snat_in2out_node) = { .function = snat_in2out_fast_path_fn, .name = "nat44-in2out", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = SNAT_IN2OUT_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_node, snat_in2out_fast_path_fn); static uword snat_in2out_output_fast_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return snat_in2out_node_fn_inline (vm, node, frame, 0 /* is_slow_path */, 1); } VLIB_REGISTER_NODE (snat_in2out_output_node) = { .function = snat_in2out_output_fast_path_fn, .name = "nat44-in2out-output", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = SNAT_IN2OUT_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_node, snat_in2out_output_fast_path_fn); static uword snat_in2out_slow_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */, 0); } VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = { .function = snat_in2out_slow_path_fn, .name = "nat44-in2out-slowpath", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = SNAT_IN2OUT_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_slowpath_node, snat_in2out_slow_path_fn); static uword snat_in2out_output_slow_path_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return snat_in2out_node_fn_inline (vm, node, frame, 1 /* is_slow_path */, 1); } VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = { .function = snat_in2out_output_slow_path_fn, .name = "nat44-in2out-output-slowpath", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = SNAT_IN2OUT_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "interface-output", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-output-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_slowpath_node, snat_in2out_output_slow_path_fn); extern vnet_feature_arc_registration_t vnet_feat_arc_ip4_local; static uword nat44_hairpinning_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; snat_in2out_next_t next_index; u32 pkts_processed = 0; snat_main_t * sm = &snat_main; vnet_feature_main_t *fm = &feature_main; u8 arc_index = vnet_feat_arc_ip4_local.feature_arc_index; vnet_feature_config_main_t *cm = &fm->feature_config_mains[arc_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 > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t * b0; u32 next0; ip4_header_t * ip0; u32 proto0; udp_header_t * udp0; tcp_header_t * tcp0; /* 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); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; proto0 = ip_proto_to_snat_proto (ip0->protocol); vnet_get_config_data (&cm->config_main, &b0->current_config_index, &next0, 0); if (snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0)) next0 = SNAT_IN2OUT_NEXT_LOOKUP; pkts_processed += next0 != SNAT_IN2OUT_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, nat44_hairpinning_node.index, SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, pkts_processed); return frame->n_vectors; } VLIB_REGISTER_NODE (nat44_hairpinning_node) = { .function = nat44_hairpinning_fn, .name = "nat44-hairpinning", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .n_next_nodes = 2, .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", }, }; VLIB_NODE_FUNCTION_MULTIARCH (nat44_hairpinning_node, nat44_hairpinning_fn); static inline void nat44_reass_hairpinning (snat_main_t *sm, vlib_buffer_t * b0, ip4_header_t * ip0, u16 sport, u16 dport, u32 proto0) { snat_session_key_t key0, sm0; snat_session_t * s0; clib_bihash_kv_8_8_t kv0, value0; ip_csum_t sum0; u32 new_dst_addr0 = 0, old_dst_addr0, ti = 0, si; u16 new_dst_port0, old_dst_port0; udp_header_t * udp0; tcp_header_t * tcp0; key0.addr = ip0->dst_address; key0.port = dport; key0.protocol = proto0; key0.fib_index = sm->outside_fib_index; kv0.key = key0.as_u64; udp0 = ip4_next_header (ip0); /* Check if destination is static mappings */ if (!snat_static_mapping_match(sm, key0, &sm0, 1, 0, 0)) { new_dst_addr0 = sm0.addr.as_u32; new_dst_port0 = sm0.port; vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; } /* or active sessions */ else { if (sm->num_workers > 1) ti = (clib_net_to_host_u16 (udp0->dst_port) - 1024) / sm->port_per_thread; else ti = sm->num_workers; if (!clib_bihash_search_8_8 (&sm->per_thread_data[ti].out2in, &kv0, &value0)) { si = value0.value; s0 = pool_elt_at_index (sm->per_thread_data[ti].sessions, si); new_dst_addr0 = s0->in2out.addr.as_u32; new_dst_port0 = s0->in2out.port; vnet_buffer(b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; } } /* Destination is behind the same NAT, use internal address and port */ if (new_dst_addr0) { old_dst_addr0 = ip0->dst_address.as_u32; ip0->dst_address.as_u32 = new_dst_addr0; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, ip4_header_t, dst_address); ip0->checksum = ip_csum_fold (sum0); old_dst_port0 = dport; if (PREDICT_TRUE(new_dst_port0 != old_dst_port0 && ip4_is_first_fragment (ip0))) { if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { tcp0 = ip4_next_header (ip0); tcp0->dst = new_dst_port0; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, old_dst_port0, new_dst_port0, ip4_header_t /* cheat */, length); tcp0->checksum = ip_csum_fold(sum0); } else { udp0->dst_port = new_dst_port0; udp0->checksum = 0; } } else { if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { tcp0 = ip4_next_header (ip0); sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_dst_addr0, new_dst_addr0, ip4_header_t, dst_address); tcp0->checksum = ip_csum_fold(sum0); } } } } static uword nat44_in2out_reass_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; snat_in2out_next_t next_index; u32 pkts_processed = 0; snat_main_t *sm = &snat_main; f64 now = vlib_time_now (vm); u32 thread_index = vlib_get_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; vlib_buffer_t *b0; u32 next0; u8 cached0 = 0; ip4_header_t *ip0; nat_reass_ip4_t *reass0; udp_header_t * udp0; tcp_header_t * tcp0; snat_session_key_t key0; clib_bihash_kv_8_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 = SNAT_IN2OUT_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 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT]; goto trace0; } ip0 = (ip4_header_t *) vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); tcp0 = (tcp_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 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_REASS]; goto trace0; } if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) { key0.addr = ip0->src_address; key0.port = udp0->src_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (clib_bihash_search_8_8 (&per_thread_data->in2out, &kv0, &value0)) { if (PREDICT_FALSE(snat_not_translate(sm, node, sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) goto trace0; next0 = slow_path (sm, b0, ip0, rx_fib_index0, &key0, &s0, node, next0, thread_index); if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) 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 (PREDICT_FALSE (reass0->sess_index == (u32) ~0)) { if (nat_ip4_reass_add_fragment (reass0, bi0)) { b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_FRAG]; next0 = SNAT_IN2OUT_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; 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 */); 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 */); tcp0->checksum = ip_csum_fold(sum0); } else { old_port0 = udp0->src_port; udp0->src_port = s0->out2in.port; udp0->checksum = 0; } } /* Hairpinning */ nat44_reass_hairpinning (sm, b0, ip0, s0->out2in.port, s0->ext_host_port, proto0); /* Accounting */ s0->last_heard = now; s0->total_pkts++; s0->total_bytes += vlib_buffer_length_in_chain (vm, b0); /* Per-user LRU list maintenance */ clib_dlist_remove (sm->per_thread_data[thread_index].list_pool, s0->per_user_index); clib_dlist_addtail (sm->per_thread_data[thread_index].list_pool, s0->per_user_list_head_index, s0->per_user_index); trace0: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_in2out_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 != SNAT_IN2OUT_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_in2out_reass_node.index, SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, pkts_processed); nat_send_all_to_node (vm, fragments_to_drop, node, &node->errors[SNAT_IN2OUT_ERROR_DROP_FRAGMENT], SNAT_IN2OUT_NEXT_DROP); vec_free (fragments_to_drop); vec_free (fragments_to_loopback); return frame->n_vectors; } VLIB_REGISTER_NODE (nat44_in2out_reass_node) = { .function = nat44_in2out_reass_node_fn, .name = "nat44-in2out-reass", .vector_size = sizeof (u32), .format_trace = format_nat44_in2out_reass_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .n_next_nodes = SNAT_IN2OUT_N_NEXT, .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; VLIB_NODE_FUNCTION_MULTIARCH (nat44_in2out_reass_node, nat44_in2out_reass_node_fn); /**************************/ /*** deterministic mode ***/ /**************************/ static uword snat_det_in2out_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; snat_in2out_next_t next_index; u32 pkts_processed = 0; snat_main_t * sm = &snat_main; u32 now = (u32) vlib_time_now (vm); u32 thread_index = vlib_get_thread_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, next1; u32 sw_if_index0, sw_if_index1; ip4_header_t * ip0, * ip1; ip_csum_t sum0, sum1; ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1; u16 old_port0, new_port0, lo_port0, i0; u16 old_port1, new_port1, lo_port1, i1; udp_header_t * udp0, * udp1; tcp_header_t * tcp0, * tcp1; u32 proto0, proto1; snat_det_out_key_t key0, key1; snat_det_map_t * dm0, * dm1; snat_det_session_t * ses0 = 0, * ses1 = 0; u32 rx_fib_index0, rx_fib_index1; icmp46_header_t * icmp0, * icmp1; /* 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 = SNAT_IN2OUT_NEXT_LOOKUP; next1 = SNAT_IN2OUT_NEXT_LOOKUP; ip0 = vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace0; } proto0 = ip_proto_to_snat_proto (ip0->protocol); if (PREDICT_FALSE(proto0 == SNAT_PROTOCOL_ICMP)) { rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0); icmp0 = (icmp46_header_t *) udp0; next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, thread_index, &ses0, &dm0); goto trace0; } dm0 = snat_det_map_by_user(sm, &ip0->src_address); if (PREDICT_FALSE(!dm0)) { clib_warning("no match for internal host %U", format_ip4_address, &ip0->src_address); next0 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; goto trace0; } snat_det_forward(dm0, &ip0->src_address, &new_addr0, &lo_port0); key0.ext_host_addr = ip0->dst_address; key0.ext_host_port = tcp0->dst; ses0 = snat_det_find_ses_by_in(dm0, &ip0->src_address, tcp0->src, key0); if (PREDICT_FALSE(!ses0)) { for (i0 = 0; i0 < dm0->ports_per_host; i0++) { key0.out_port = clib_host_to_net_u16 (lo_port0 + ((i0 + clib_net_to_host_u16 (tcp0->src)) % dm0->ports_per_host)); if (snat_det_get_ses_by_out (dm0, &ip0->src_address, key0.as_u64)) continue; ses0 = snat_det_ses_create(dm0, &ip0->src_address, tcp0->src, &key0); break; } if (PREDICT_FALSE(!ses0)) { /* too many sessions for user, send ICMP error packet */ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable, ICMP4_destination_unreachable_destination_unreachable_host, 0); next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace0; } } new_port0 = ses0->out.out_port; old_addr0.as_u32 = ip0->src_address.as_u32; ip0->src_address.as_u32 = new_addr0.as_u32; vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, ip4_header_t, src_address /* changed member */); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { if (tcp0->flags & TCP_FLAG_SYN) ses0->state = SNAT_SESSION_TCP_SYN_SENT; else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_SYN_SENT) ses0->state = SNAT_SESSION_TCP_ESTABLISHED; else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED) ses0->state = SNAT_SESSION_TCP_FIN_WAIT; else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_FIN_WAIT) snat_det_ses_close(dm0, ses0); else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT) ses0->state = SNAT_SESSION_TCP_LAST_ACK; else if (tcp0->flags == 0 && ses0->state == SNAT_SESSION_UNKNOWN) ses0->state = SNAT_SESSION_TCP_ESTABLISHED; old_port0 = tcp0->src; tcp0->src = new_port0; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, ip4_header_t, dst_address /* changed member */); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */, length /* changed member */); tcp0->checksum = ip_csum_fold(sum0); } else { ses0->state = SNAT_SESSION_UDP_ACTIVE; old_port0 = udp0->src_port; udp0->src_port = new_port0; udp0->checksum = 0; } switch(ses0->state) { case SNAT_SESSION_UDP_ACTIVE: ses0->expire = now + sm->udp_timeout; break; case SNAT_SESSION_TCP_SYN_SENT: case SNAT_SESSION_TCP_FIN_WAIT: case SNAT_SESSION_TCP_CLOSE_WAIT: case SNAT_SESSION_TCP_LAST_ACK: ses0->expire = now + sm->tcp_transitory_timeout; break; case SNAT_SESSION_TCP_ESTABLISHED: ses0->expire = now + sm->tcp_established_timeout; break; } trace0: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = 0; t->sw_if_index = sw_if_index0; t->next_index = next0; t->session_index = ~0; if (ses0) t->session_index = ses0 - dm0->sessions; } pkts_processed += next0 != SNAT_IN2OUT_NEXT_DROP; ip1 = vlib_buffer_get_current (b1); udp1 = ip4_next_header (ip1); tcp1 = (tcp_header_t *) udp1; sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX]; 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace1; } proto1 = ip_proto_to_snat_proto (ip1->protocol); if (PREDICT_FALSE(proto1 == SNAT_PROTOCOL_ICMP)) { rx_fib_index1 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index1); icmp1 = (icmp46_header_t *) udp1; next1 = icmp_in2out(sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, next1, thread_index, &ses1, &dm1); goto trace1; } dm1 = snat_det_map_by_user(sm, &ip1->src_address); if (PREDICT_FALSE(!dm1)) { clib_warning("no match for internal host %U", format_ip4_address, &ip0->src_address); next1 = SNAT_IN2OUT_NEXT_DROP; b1->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; goto trace1; } snat_det_forward(dm1, &ip1->src_address, &new_addr1, &lo_port1); key1.ext_host_addr = ip1->dst_address; key1.ext_host_port = tcp1->dst; ses1 = snat_det_find_ses_by_in(dm1, &ip1->src_address, tcp1->src, key1); if (PREDICT_FALSE(!ses1)) { for (i1 = 0; i1 < dm1->ports_per_host; i1++) { key1.out_port = clib_host_to_net_u16 (lo_port1 + ((i1 + clib_net_to_host_u16 (tcp1->src)) % dm1->ports_per_host)); if (snat_det_get_ses_by_out (dm1, &ip1->src_address, key1.as_u64)) continue; ses1 = snat_det_ses_create(dm1, &ip1->src_address, tcp1->src, &key1); break; } if (PREDICT_FALSE(!ses1)) { /* too many sessions for user, send ICMP error packet */ vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b1, ICMP4_destination_unreachable, ICMP4_destination_unreachable_destination_unreachable_host, 0); next1 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace1; } } new_port1 = ses1->out.out_port; old_addr1.as_u32 = ip1->src_address.as_u32; ip1->src_address.as_u32 = new_addr1.as_u32; vnet_buffer(b1)->sw_if_index[VLIB_TX] = sm->outside_fib_index; sum1 = ip1->checksum; sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, ip4_header_t, src_address /* changed member */); ip1->checksum = ip_csum_fold (sum1); if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP)) { if (tcp1->flags & TCP_FLAG_SYN) ses1->state = SNAT_SESSION_TCP_SYN_SENT; else if (tcp1->flags & TCP_FLAG_ACK && ses1->state == SNAT_SESSION_TCP_SYN_SENT) ses1->state = SNAT_SESSION_TCP_ESTABLISHED; else if (tcp1->flags & TCP_FLAG_FIN && ses1->state == SNAT_SESSION_TCP_ESTABLISHED) ses1->state = SNAT_SESSION_TCP_FIN_WAIT; else if (tcp1->flags & TCP_FLAG_ACK && ses1->state == SNAT_SESSION_TCP_FIN_WAIT) snat_det_ses_close(dm1, ses1); else if (tcp1->flags & TCP_FLAG_FIN && ses1->state == SNAT_SESSION_TCP_CLOSE_WAIT) ses1->state = SNAT_SESSION_TCP_LAST_ACK; else if (tcp1->flags == 0 && ses1->state == SNAT_SESSION_UNKNOWN) ses1->state = SNAT_SESSION_TCP_ESTABLISHED; old_port1 = tcp1->src; tcp1->src = new_port1; sum1 = tcp1->checksum; sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32, ip4_header_t, dst_address /* changed member */); sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t /* cheat */, length /* changed member */); tcp1->checksum = ip_csum_fold(sum1); } else { ses1->state = SNAT_SESSION_UDP_ACTIVE; old_port1 = udp1->src_port; udp1->src_port = new_port1; udp1->checksum = 0; } switch(ses1->state) { case SNAT_SESSION_UDP_ACTIVE: ses1->expire = now + sm->udp_timeout; break; case SNAT_SESSION_TCP_SYN_SENT: case SNAT_SESSION_TCP_FIN_WAIT: case SNAT_SESSION_TCP_CLOSE_WAIT: case SNAT_SESSION_TCP_LAST_ACK: ses1->expire = now + sm->tcp_transitory_timeout; break; case SNAT_SESSION_TCP_ESTABLISHED: ses1->expire = now + sm->tcp_established_timeout; break; } trace1: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->is_slow_path = 0; t->sw_if_index = sw_if_index1; t->next_index = next1; t->session_index = ~0; if (ses1) t->session_index = ses1 - dm1->sessions; } pkts_processed += next1 != SNAT_IN2OUT_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; u32 sw_if_index0; ip4_header_t * ip0; ip_csum_t sum0; ip4_address_t new_addr0, old_addr0; u16 old_port0, new_port0, lo_port0, i0; udp_header_t * udp0; tcp_header_t * tcp0; u32 proto0; snat_det_out_key_t key0; snat_det_map_t * dm0; snat_det_session_t * ses0 = 0; u32 rx_fib_index0; icmp46_header_t * icmp0; /* 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 = SNAT_IN2OUT_NEXT_LOOKUP; ip0 = vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; 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 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace00; } proto0 = ip_proto_to_snat_proto (ip0->protocol); if (PREDICT_FALSE(proto0 == SNAT_PROTOCOL_ICMP)) { rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0); icmp0 = (icmp46_header_t *) udp0; next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, thread_index, &ses0, &dm0); goto trace00; } dm0 = snat_det_map_by_user(sm, &ip0->src_address); if (PREDICT_FALSE(!dm0)) { clib_warning("no match for internal host %U", format_ip4_address, &ip0->src_address); next0 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; goto trace00; } snat_det_forward(dm0, &ip0->src_address, &new_addr0, &lo_port0); key0.ext_host_addr = ip0->dst_address; key0.ext_host_port = tcp0->dst; ses0 = snat_det_find_ses_by_in(dm0, &ip0->src_address, tcp0->src, key0); if (PREDICT_FALSE(!ses0)) { for (i0 = 0; i0 < dm0->ports_per_host; i0++) { key0.out_port = clib_host_to_net_u16 (lo_port0 + ((i0 + clib_net_to_host_u16 (tcp0->src)) % dm0->ports_per_host)); if (snat_det_get_ses_by_out (dm0, &ip0->src_address, key0.as_u64)) continue; ses0 = snat_det_ses_create(dm0, &ip0->src_address, tcp0->src, &key0); break; } if (PREDICT_FALSE(!ses0)) { /* too many sessions for user, send ICMP error packet */ vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b0, ICMP4_destination_unreachable, ICMP4_destination_unreachable_destination_unreachable_host, 0); next0 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace00; } } new_port0 = ses0->out.out_port; old_addr0.as_u32 = ip0->src_address.as_u32; ip0->src_address.as_u32 = new_addr0.as_u32; vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->outside_fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, ip4_header_t, src_address /* changed member */); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { if (tcp0->flags & TCP_FLAG_SYN) ses0->state = SNAT_SESSION_TCP_SYN_SENT; else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_SYN_SENT) ses0->state = SNAT_SESSION_TCP_ESTABLISHED; else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED) ses0->state = SNAT_SESSION_TCP_FIN_WAIT; else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_FIN_WAIT) snat_det_ses_close(dm0, ses0); else if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_CLOSE_WAIT) ses0->state = SNAT_SESSION_TCP_LAST_ACK; else if (tcp0->flags == 0 && ses0->state == SNAT_SESSION_UNKNOWN) ses0->state = SNAT_SESSION_TCP_ESTABLISHED; old_port0 = tcp0->src; tcp0->src = new_port0; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32, ip4_header_t, dst_address /* changed member */); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */, length /* changed member */); tcp0->checksum = ip_csum_fold(sum0); } else { ses0->state = SNAT_SESSION_UDP_ACTIVE; old_port0 = udp0->src_port; udp0->src_port = new_port0; udp0->checksum = 0; } switch(ses0->state) { case SNAT_SESSION_UDP_ACTIVE: ses0->expire = now + sm->udp_timeout; break; case SNAT_SESSION_TCP_SYN_SENT: case SNAT_SESSION_TCP_FIN_WAIT: case SNAT_SESSION_TCP_CLOSE_WAIT: case SNAT_SESSION_TCP_LAST_ACK: ses0->expire = now + sm->tcp_transitory_timeout; break; case SNAT_SESSION_TCP_ESTABLISHED: ses0->expire = now + sm->tcp_established_timeout; break; } trace00: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = 0; t->sw_if_index = sw_if_index0; t->next_index = next0; t->session_index = ~0; if (ses0) t->session_index = ses0 - dm0->sessions; } pkts_processed += next0 != SNAT_IN2OUT_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, snat_det_in2out_node.index, SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, pkts_processed); return frame->n_vectors; } VLIB_REGISTER_NODE (snat_det_in2out_node) = { .function = snat_det_in2out_node_fn, .name = "nat44-det-in2out", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = 3, /* edit / add dispositions here */ .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_det_in2out_node, snat_det_in2out_node_fn); /** * Get address and port values to be used for ICMP packet translation * and create session if needed * * @param[in,out] sm NAT main * @param[in,out] node NAT node runtime * @param[in] thread_index thread index * @param[in,out] b0 buffer containing packet to be translated * @param[out] p_proto protocol used for matching * @param[out] p_value address and port after NAT translation * @param[out] p_dont_translate if packet should not be translated * @param d optional parameter * @param e optional parameter */ u32 icmp_match_in2out_det(snat_main_t *sm, vlib_node_runtime_t *node, u32 thread_index, vlib_buffer_t *b0, ip4_header_t *ip0, u8 *p_proto, snat_session_key_t *p_value, u8 *p_dont_translate, void *d, void *e) { icmp46_header_t *icmp0; u32 sw_if_index0; u32 rx_fib_index0; u8 protocol; snat_det_out_key_t key0; u8 dont_translate = 0; u32 next0 = ~0; icmp_echo_header_t *echo0, *inner_echo0 = 0; ip4_header_t *inner_ip0; void *l4_header = 0; icmp46_header_t *inner_icmp0; snat_det_map_t * dm0 = 0; ip4_address_t new_addr0; u16 lo_port0, i0; snat_det_session_t * ses0 = 0; ip4_address_t in_addr; u16 in_port; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); echo0 = (icmp_echo_header_t *)(icmp0+1); sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); if (!icmp_is_error_message (icmp0)) { protocol = SNAT_PROTOCOL_ICMP; in_addr = ip0->src_address; in_port = echo0->identifier; } else { inner_ip0 = (ip4_header_t *)(echo0+1); l4_header = ip4_next_header (inner_ip0); protocol = ip_proto_to_snat_proto (inner_ip0->protocol); in_addr = inner_ip0->dst_address; switch (protocol) { case SNAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t*)l4_header; inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1); in_port = inner_echo0->identifier; break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: in_port = ((tcp_udp_header_t*)l4_header)->dst_port; break; default: b0->error = node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } } dm0 = snat_det_map_by_user(sm, &in_addr); if (PREDICT_FALSE(!dm0)) { clib_warning("no match for internal host %U", format_ip4_address, &in_addr); if (PREDICT_FALSE(snat_not_translate_fast(sm, node, sw_if_index0, ip0, IP_PROTOCOL_ICMP, rx_fib_index0))) { dont_translate = 1; goto out; } next0 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; goto out; } snat_det_forward(dm0, &in_addr, &new_addr0, &lo_port0); key0.ext_host_addr = ip0->dst_address; key0.ext_host_port = 0; ses0 = snat_det_find_ses_by_in(dm0, &in_addr, in_port, key0); if (PREDICT_FALSE(!ses0)) { if (PREDICT_FALSE(snat_not_translate_fast(sm, node, sw_if_index0, ip0, IP_PROTOCOL_ICMP, rx_fib_index0))) { dont_translate = 1; goto out; } if (icmp0->type != ICMP4_echo_request) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } for (i0 = 0; i0 < dm0->ports_per_host; i0++) { key0.out_port = clib_host_to_net_u16 (lo_port0 + ((i0 + clib_net_to_host_u16 (echo0->identifier)) % dm0->ports_per_host)); if (snat_det_get_ses_by_out (dm0, &in_addr, key0.as_u64)) continue; ses0 = snat_det_ses_create(dm0, &in_addr, echo0->identifier, &key0); break; } if (PREDICT_FALSE(!ses0)) { next0 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_OUT_OF_PORTS]; goto out; } } if (PREDICT_FALSE(icmp0->type != ICMP4_echo_request && !icmp_is_error_message (icmp0))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } u32 now = (u32) vlib_time_now (sm->vlib_main); ses0->state = SNAT_SESSION_ICMP_ACTIVE; ses0->expire = now + sm->icmp_timeout; out: *p_proto = protocol; if (ses0) { p_value->addr = new_addr0; p_value->fib_index = sm->outside_fib_index; p_value->port = ses0->out.out_port; } *p_dont_translate = dont_translate; if (d) *(snat_det_session_t**)d = ses0; if (e) *(snat_det_map_t**)e = dm0; return next0; } /**********************/ /*** worker handoff ***/ /**********************/ static inline uword snat_in2out_worker_handoff_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, u8 is_output) { snat_main_t *sm = &snat_main; vlib_thread_main_t *tm = vlib_get_thread_main (); u32 n_left_from, *from, *to_next = 0; static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index; static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index = 0; vlib_frame_queue_elt_t *hf = 0; vlib_frame_t *f = 0; int i; u32 n_left_to_next_worker = 0, *to_next_worker = 0; u32 next_worker_index = 0; u32 current_worker_index = ~0; u32 thread_index = vlib_get_thread_index (); u32 fq_index; u32 to_node_index; ASSERT (vec_len (sm->workers)); if (is_output) { fq_index = sm->fq_in2out_output_index; to_node_index = sm->in2out_output_node_index; } else { fq_index = sm->fq_in2out_index; to_node_index = sm->in2out_node_index; } if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0)) { vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1); vec_validate_init_empty (congested_handoff_queue_by_worker_index, sm->first_worker_index + sm->num_workers - 1, (vlib_frame_queue_t *) (~0)); } from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; while (n_left_from > 0) { u32 bi0; vlib_buffer_t *b0; u32 sw_if_index0; u32 rx_fib_index0; ip4_header_t * ip0; u8 do_handoff; bi0 = from[0]; from += 1; n_left_from -= 1; b0 = vlib_get_buffer (vm, bi0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0); ip0 = vlib_buffer_get_current (b0); next_worker_index = sm->worker_in2out_cb(ip0, rx_fib_index0); if (PREDICT_FALSE (next_worker_index != thread_index)) { do_handoff = 1; if (next_worker_index != current_worker_index) { if (hf) hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; hf = vlib_get_worker_handoff_queue_elt (fq_index, next_worker_index, handoff_queue_elt_by_worker_index); n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors; to_next_worker = &hf->buffer_index[hf->n_vectors]; current_worker_index = next_worker_index; } /* enqueue to correct worker thread */ to_next_worker[0] = bi0; to_next_worker++; n_left_to_next_worker--; if (n_left_to_next_worker == 0) { hf->n_vectors = VLIB_FRAME_SIZE; vlib_put_frame_queue_elt (hf); current_worker_index = ~0; handoff_queue_elt_by_worker_index[next_worker_index] = 0; hf = 0; } } else { do_handoff = 0; /* if this is 1st frame */ if (!f) { f = vlib_get_frame_to_node (vm, to_node_index); to_next = vlib_frame_vector_args (f); } to_next[0] = bi0; to_next += 1; f->n_vectors++; } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_worker_handoff_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->next_worker_index = next_worker_index; t->do_handoff = do_handoff; } } if (f) vlib_put_frame_to_node (vm, to_node_index, f); if (hf) hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker; /* Ship frames to the worker nodes */ for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++) { if (handoff_queue_elt_by_worker_index[i]) { hf = handoff_queue_elt_by_worker_index[i]; /* * It works better to let the handoff node * rate-adapt, always ship the handoff queue element. */ if (1 || hf->n_vectors == hf->last_n_vectors) { vlib_put_frame_queue_elt (hf); handoff_queue_elt_by_worker_index[i] = 0; } else hf->last_n_vectors = hf->n_vectors; } congested_handoff_queue_by_worker_index[i] = (vlib_frame_queue_t *) (~0); } hf = 0; current_worker_index = ~0; return frame->n_vectors; } static uword snat_in2out_worker_handoff_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return snat_in2out_worker_handoff_fn_inline (vm, node, frame, 0); } VLIB_REGISTER_NODE (snat_in2out_worker_handoff_node) = { .function = snat_in2out_worker_handoff_fn, .name = "nat44-in2out-worker-handoff", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_worker_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_worker_handoff_node, snat_in2out_worker_handoff_fn); static uword snat_in2out_output_worker_handoff_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return snat_in2out_worker_handoff_fn_inline (vm, node, frame, 1); } VLIB_REGISTER_NODE (snat_in2out_output_worker_handoff_node) = { .function = snat_in2out_output_worker_handoff_fn, .name = "nat44-in2out-output-worker-handoff", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_worker_handoff_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_output_worker_handoff_node, snat_in2out_output_worker_handoff_fn); static_always_inline int is_hairpinning (snat_main_t *sm, ip4_address_t * dst_addr) { snat_address_t * ap; clib_bihash_kv_8_8_t kv, value; snat_session_key_t m_key; vec_foreach (ap, sm->addresses) { if (ap->addr.as_u32 == dst_addr->as_u32) return 1; } m_key.addr.as_u32 = dst_addr->as_u32; m_key.fib_index = sm->outside_fib_index; m_key.port = 0; m_key.protocol = 0; kv.key = m_key.as_u64; if (!clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) return 1; return 0; } static uword snat_hairpin_dst_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; snat_in2out_next_t next_index; u32 pkts_processed = 0; 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; ip4_header_t * ip0; u32 proto0; /* 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 = SNAT_IN2OUT_NEXT_LOOKUP; ip0 = vlib_buffer_get_current (b0); proto0 = ip_proto_to_snat_proto (ip0->protocol); vnet_buffer (b0)->snat.flags = 0; if (PREDICT_FALSE (is_hairpinning (sm, &ip0->dst_address))) { if (proto0 == SNAT_PROTOCOL_TCP || proto0 == SNAT_PROTOCOL_UDP) { udp_header_t * udp0 = ip4_next_header (ip0); tcp_header_t * tcp0 = (tcp_header_t *) udp0; snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0); } else if (proto0 == SNAT_PROTOCOL_ICMP) { icmp46_header_t * icmp0 = ip4_next_header (ip0); snat_icmp_hairpinning (sm, b0, ip0, icmp0); } else { snat_hairpinning_unknown_proto (sm, b0, ip0); } vnet_buffer (b0)->snat.flags = SNAT_FLAG_HAIRPINNING; } pkts_processed += next0 != SNAT_IN2OUT_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, snat_hairpin_dst_node.index, SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, pkts_processed); return frame->n_vectors; } VLIB_REGISTER_NODE (snat_hairpin_dst_node) = { .function = snat_hairpin_dst_fn, .name = "nat44-hairpin-dst", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .n_next_nodes = 2, .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_dst_node, snat_hairpin_dst_fn); static uword snat_hairpin_src_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; snat_in2out_next_t next_index; u32 pkts_processed = 0; 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; snat_interface_t *i; u32 sw_if_index0; /* 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); sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; next0 = SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT; pool_foreach (i, sm->output_feature_interfaces, ({ /* Only packets from NAT inside interface */ if ((nat_interface_is_inside(i)) && (sw_if_index0 == i->sw_if_index)) { if (PREDICT_FALSE ((vnet_buffer (b0)->snat.flags) & SNAT_FLAG_HAIRPINNING)) { if (PREDICT_TRUE (sm->num_workers > 1)) next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH; else next0 = SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT; } break; } })); pkts_processed += next0 != SNAT_IN2OUT_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, snat_hairpin_src_node.index, SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, pkts_processed); return frame->n_vectors; } VLIB_REGISTER_NODE (snat_hairpin_src_node) = { .function = snat_hairpin_src_fn, .name = "nat44-hairpin-src", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .n_next_nodes = SNAT_HAIRPIN_SRC_N_NEXT, .next_nodes = { [SNAT_HAIRPIN_SRC_NEXT_DROP] = "error-drop", [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT] = "nat44-in2out-output", [SNAT_HAIRPIN_SRC_NEXT_INTERFACE_OUTPUT] = "interface-output", [SNAT_HAIRPIN_SRC_NEXT_SNAT_IN2OUT_WH] = "nat44-in2out-output-worker-handoff", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_hairpin_src_node, snat_hairpin_src_fn); static uword snat_in2out_fast_static_map_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, * from, * to_next; snat_in2out_next_t next_index; u32 pkts_processed = 0; snat_main_t * sm = &snat_main; u32 stats_node_index; stats_node_index = snat_in2out_fast_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 > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t * b0; u32 next0; u32 sw_if_index0; ip4_header_t * ip0; ip_csum_t sum0; u32 new_addr0, old_addr0; u16 old_port0, new_port0; udp_header_t * udp0; tcp_header_t * tcp0; icmp46_header_t * icmp0; snat_session_key_t key0, sm0; u32 proto0; u32 rx_fib_index0; /* 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 = SNAT_IN2OUT_NEXT_LOOKUP; ip0 = vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_header_t *) udp0; sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(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 = SNAT_IN2OUT_NEXT_ICMP_ERROR; goto trace0; } proto0 = ip_proto_to_snat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == ~0)) goto trace0; if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_in2out(sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, ~0, 0, 0); goto trace0; } key0.addr = ip0->src_address; key0.protocol = proto0; key0.port = udp0->src_port; key0.fib_index = rx_fib_index0; if (snat_static_mapping_match(sm, key0, &sm0, 0, 0, 0)) { b0->error = node->errors[SNAT_IN2OUT_ERROR_NO_TRANSLATION]; next0= SNAT_IN2OUT_NEXT_DROP; goto trace0; } new_addr0 = sm0.addr.as_u32; new_port0 = sm0.port; vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm0.fib_index; old_addr0 = ip0->src_address.as_u32; ip0->src_address.as_u32 = new_addr0; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, src_address /* changed member */); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_FALSE(new_port0 != udp0->dst_port)) { if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->src_port; tcp0->src_port = new_port0; 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 */); tcp0->checksum = ip_csum_fold(sum0); } else { old_port0 = udp0->src_port; udp0->src_port = new_port0; udp0->checksum = 0; } } else { if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP)) { sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */); tcp0->checksum = ip_csum_fold(sum0); } } /* Hairpinning */ snat_hairpinning (sm, b0, ip0, udp0, tcp0, proto0); trace0: if (PREDICT_FALSE((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_in2out_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } pkts_processed += next0 != SNAT_IN2OUT_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, SNAT_IN2OUT_ERROR_IN2OUT_PACKETS, pkts_processed); return frame->n_vectors; } VLIB_REGISTER_NODE (snat_in2out_fast_node) = { .function = snat_in2out_fast_static_map_fn, .name = "nat44-in2out-fast", .vector_size = sizeof (u32), .format_trace = format_snat_in2out_fast_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_in2out_error_strings), .error_strings = snat_in2out_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = SNAT_IN2OUT_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_IN2OUT_NEXT_DROP] = "error-drop", [SNAT_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [SNAT_IN2OUT_NEXT_SLOW_PATH] = "nat44-in2out-slowpath", [SNAT_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_IN2OUT_NEXT_REASS] = "nat44-in2out-reass", }, }; VLIB_NODE_FUNCTION_MULTIARCH (snat_in2out_fast_node, snat_in2out_fast_static_map_fn);