/* * 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. */ /** * @file * @brief NAT44 inside to outside network translation */ #include #include #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; u32 is_hairpinning; } snat_in2out_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); if (t->is_hairpinning) { s = format (s, ", with-hairpinning"); } 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; } #define foreach_snat_in2out_error \ _(UNSUPPORTED_PROTOCOL, "unsupported protocol") \ _(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") \ _(CANNOT_CREATE_USER, "cannot create NAT user") 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_N_NEXT, } snat_in2out_next_t; 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); clib_bihash_kv_8_8_t kv0, value0; init_nat_k (&kv0, ip0->dst_address, udp0->dst_port, sm->outside_fib_index, proto0); /* 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 */ ip4_address_t placeholder_addr; u16 placeholder_port; u32 placeholder_fib_index; if (!snat_static_mapping_match (sm, ip0->dst_address, udp0->dst_port, sm->outside_fib_index, proto0, &placeholder_addr, &placeholder_port, &placeholder_fib_index, 1, 0, 0, 0, 0, 0, 0)) return 0; } else return 0; if (sm->forwarding_enabled) return 1; return snat_not_translate_fast (sm, node, sw_if_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, u16 dst_port, u32 thread_index, u32 sw_if_index) { clib_bihash_kv_8_8_t kv0, value0; snat_interface_t *i; /* src NAT check */ init_nat_k (&kv0, ip0->src_address, src_port, ip4_fib_table_get_index_for_sw_if_index (sw_if_index), proto0); if (!clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) return 1; /* dst NAT check */ init_nat_k (&kv0, ip0->dst_address, dst_port, ip4_fib_table_get_index_for_sw_if_index (sw_if_index), proto0); if (!clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, &value0)) { /* hairpinning */ /* *INDENT-OFF* */ pool_foreach (i, sm->output_feature_interfaces, ({ if ((nat_interface_is_inside(i)) && (sw_if_index == i->sw_if_index)) return 0; })); /* *INDENT-ON* */ return 1; } return 0; } #ifndef CLIB_MARCH_VARIANT int nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg) { snat_main_t *sm = &snat_main; nat44_is_idle_session_ctx_t *ctx = arg; snat_session_t *s; u64 sess_timeout_time; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, ctx->thread_index); clib_bihash_kv_8_8_t s_kv; s = pool_elt_at_index (tsm->sessions, kv->value); sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s); if (ctx->now >= sess_timeout_time) { init_nat_o2i_k (&s_kv, s); if (clib_bihash_add_del_8_8 (&tsm->out2in, &s_kv, 0)) nat_elog_warn ("out2in key del failed"); nat_ipfix_logging_nat44_ses_delete (ctx->thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->nat_proto, s->in2out.port, s->out2in.port, s->in2out.fib_index); nat_syslog_nat44_apmdel (s->user_index, s->in2out.fib_index, &s->in2out.addr, s->in2out.port, &s->out2in.addr, s->out2in.port, s->nat_proto); nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr, s->ext_host_port, s->nat_proto, s->out2in.fib_index, ctx->thread_index); if (!snat_is_session_static (s)) snat_free_outside_address_and_port (sm->addresses, ctx->thread_index, &s->out2in.addr, s->out2in.port, s->nat_proto); nat44_delete_session (sm, s, ctx->thread_index); return 1; } return 0; } #endif static u32 slow_path (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0, ip4_address_t i2o_addr, u16 i2o_port, u32 rx_fib_index0, nat_protocol_t nat_proto, snat_session_t ** sessionp, vlib_node_runtime_t * node, u32 next0, u32 thread_index, f64 now) { snat_user_t *u; snat_session_t *s = 0; clib_bihash_kv_8_8_t kv0; u8 is_sm = 0; nat_outside_fib_t *outside_fib; fib_node_index_t fei = FIB_NODE_INDEX_INVALID; u8 identity_nat; fib_prefix_t pfx = { .fp_proto = FIB_PROTOCOL_IP4, .fp_len = 32, .fp_addr = { .ip4.as_u32 = ip0->dst_address.as_u32, }, }; nat44_is_idle_session_ctx_t ctx0; ip4_address_t sm_addr; u16 sm_port; u32 sm_fib_index; if (PREDICT_FALSE (nat44_maximum_sessions_exceeded (sm, thread_index))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; nat_ipfix_logging_max_sessions (thread_index, sm->max_translations_per_thread); nat_elog_notice ("maximum sessions exceeded"); return SNAT_IN2OUT_NEXT_DROP; } /* First try to match static mapping by local address and port */ if (snat_static_mapping_match (sm, i2o_addr, i2o_port, rx_fib_index0, nat_proto, &sm_addr, &sm_port, &sm_fib_index, 0, 0, 0, 0, 0, &identity_nat, 0)) { /* Try to create dynamic translation */ if (snat_alloc_outside_address_and_port (sm->addresses, rx_fib_index0, thread_index, nat_proto, &sm_addr, &sm_port, 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 { if (PREDICT_FALSE (identity_nat)) { *sessionp = s; return next0; } is_sm = 1; } u = nat_user_get_or_create (sm, &ip0->src_address, rx_fib_index0, thread_index); if (!u) { b0->error = node->errors[SNAT_IN2OUT_ERROR_CANNOT_CREATE_USER]; return SNAT_IN2OUT_NEXT_DROP; } s = nat_session_alloc_or_recycle (sm, u, thread_index, now); if (!s) { nat44_delete_user_with_no_session (sm, u, thread_index); nat_elog_warn ("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->in2out.addr = i2o_addr; s->in2out.port = i2o_port; s->in2out.fib_index = rx_fib_index0; s->nat_proto = nat_proto; s->out2in.addr = sm_addr; s->out2in.port = sm_port; s->out2in.fib_index = sm->outside_fib_index; switch (vec_len (sm->outside_fibs)) { case 0: s->out2in.fib_index = sm->outside_fib_index; break; case 1: s->out2in.fib_index = sm->outside_fibs[0].fib_index; break; default: /* *INDENT-OFF* */ vec_foreach (outside_fib, sm->outside_fibs) { fei = fib_table_lookup (outside_fib->fib_index, &pfx); if (FIB_NODE_INDEX_INVALID != fei) { if (fib_entry_get_resolving_interface (fei) != ~0) { s->out2in.fib_index = outside_fib->fib_index; break; } } } /* *INDENT-ON* */ break; } s->ext_host_addr.as_u32 = ip0->dst_address.as_u32; s->ext_host_port = vnet_buffer (b0)->ip.reass.l4_dst_port; *sessionp = s; /* Add to translation hashes */ ctx0.now = now; ctx0.thread_index = thread_index; init_nat_i2o_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions); if (clib_bihash_add_or_overwrite_stale_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, nat44_i2o_is_idle_session_cb, &ctx0)) nat_elog_notice ("in2out key add failed"); init_nat_o2i_kv (&kv0, s, s - sm->per_thread_data[thread_index].sessions); if (clib_bihash_add_or_overwrite_stale_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, nat44_o2i_is_idle_session_cb, &ctx0)) nat_elog_notice ("out2in key add failed"); /* log NAT event */ nat_ipfix_logging_nat44_ses_create (thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->nat_proto, s->in2out.port, s->out2in.port, s->in2out.fib_index); nat_syslog_nat44_apmadd (s->user_index, s->in2out.fib_index, &s->in2out.addr, s->in2out.port, &s->out2in.addr, s->out2in.port, s->nat_proto); nat_ha_sadd (&s->in2out.addr, s->in2out.port, &s->out2in.addr, s->out2in.port, &s->ext_host_addr, s->ext_host_port, &s->ext_host_nat_addr, s->ext_host_nat_port, s->nat_proto, s->in2out.fib_index, s->flags, thread_index, 0); return next0; } #ifndef CLIB_MARCH_VARIANT static_always_inline snat_in2out_error_t icmp_get_key (vlib_buffer_t * b, ip4_header_t * ip0, ip4_address_t * addr, u16 * port, nat_protocol_t * nat_proto) { icmp46_header_t *icmp0; 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_type_is_error_message (vnet_buffer (b)->ip.reass.icmp_type_or_tcp_flags)) { *nat_proto = NAT_PROTOCOL_ICMP; *addr = ip0->src_address; *port = vnet_buffer (b)->ip.reass.l4_src_port; } else { inner_ip0 = (ip4_header_t *) (echo0 + 1); l4_header = ip4_next_header (inner_ip0); *nat_proto = ip_proto_to_nat_proto (inner_ip0->protocol); *addr = inner_ip0->dst_address; switch (*nat_proto) { case NAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t *) l4_header; inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); *port = inner_echo0->identifier; break; case NAT_PROTOCOL_UDP: case NAT_PROTOCOL_TCP: *port = ((tcp_udp_header_t *) l4_header)->dst_port; break; default: return SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL; } } return -1; /* success */ } /** * 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[in,out] ip0 ip header * @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, ip4_address_t * addr, u16 * port, u32 * fib_index, nat_protocol_t * proto, void *d, void *e, u8 * dont_translate) { snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; u32 sw_if_index0; snat_session_t *s0 = 0; clib_bihash_kv_8_8_t kv0, value0; u32 next0 = ~0; int err; vlib_main_t *vm = vlib_get_main (); *dont_translate = 0; sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); err = icmp_get_key (b0, ip0, addr, port, proto); if (err != -1) { b0->error = node->errors[err]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } init_nat_k (&kv0, *addr, *port, *fib_index, *proto); if (clib_bihash_search_8_8 (&tsm->in2out, &kv0, &value0)) { if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0) { if (PREDICT_FALSE (nat_not_translate_output_feature (sm, ip0, *proto, *port, *port, thread_index, sw_if_index0))) { *dont_translate = 1; goto out; } } else { if (PREDICT_FALSE (snat_not_translate (sm, node, sw_if_index0, ip0, NAT_PROTOCOL_ICMP, *fib_index, thread_index))) { *dont_translate = 1; goto out; } } if (PREDICT_FALSE (icmp_type_is_error_message (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } next0 = slow_path (sm, b0, ip0, *addr, *port, *fib_index, *proto, &s0, node, next0, thread_index, vlib_time_now (vm)); if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) goto out; if (!s0) { *dont_translate = 1; goto out; } } else { if (PREDICT_FALSE (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply && !icmp_type_is_error_message (vnet_buffer (b0)->ip. reass.icmp_type_or_tcp_flags))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } s0 = pool_elt_at_index (tsm->sessions, value0.value); } out: if (s0) { *addr = s0->out2in.addr; *port = s0->out2in.port; *fib_index = s0->out2in.fib_index; } if (d) *(snat_session_t **) (d) = s0; return next0; } #endif #ifndef CLIB_MARCH_VARIANT /** * 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[in,out] ip0 ip header * @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, ip4_address_t * addr, u16 * port, u32 * fib_index, nat_protocol_t * proto, void *d, void *e, u8 * dont_translate) { u32 sw_if_index0; u8 is_addr_only; u32 next0 = ~0; int err; *dont_translate = 0; sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; *fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); err = icmp_get_key (b0, ip0, addr, port, proto); if (err != -1) { b0->error = node->errors[err]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } ip4_address_t sm_addr; u16 sm_port; u32 sm_fib_index; if (snat_static_mapping_match (sm, *addr, *port, *fib_index, *proto, &sm_addr, &sm_port, &sm_fib_index, 0, &is_addr_only, 0, 0, 0, 0, 0)) { if (PREDICT_FALSE (snat_not_translate_fast (sm, node, sw_if_index0, ip0, IP_PROTOCOL_ICMP, *fib_index))) { *dont_translate = 1; goto out; } if (icmp_type_is_error_message (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)) { 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 (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply || !is_addr_only) && !icmp_type_is_error_message (vnet_buffer (b0)->ip. reass.icmp_type_or_tcp_flags))) { b0->error = node->errors[SNAT_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_IN2OUT_NEXT_DROP; goto out; } out: return next0; } #endif #ifndef CLIB_MARCH_VARIANT 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) { vlib_main_t *vm = vlib_get_main (); ip4_address_t addr; u16 port; u32 fib_index; nat_protocol_t 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; u16 old_checksum0, new_checksum0; 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, &addr, &port, &fib_index, &protocol, d, e, &dont_translate); if (next0_tmp != ~0) next0 = next0_tmp; if (next0 == SNAT_IN2OUT_NEXT_DROP || dont_translate) goto out; if (PREDICT_TRUE (!ip4_is_fragment (ip0))) { sum0 = ip_incremental_checksum_buffer (vm, b0, (u8 *) icmp0 - (u8 *) vlib_buffer_get_current (b0), ntohs (ip0->length) - ip4_header_bytes (ip0), 0); 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 = addr.as_u32; 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 (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { if (icmp0->checksum == 0) icmp0->checksum = 0xffff; if (!icmp_type_is_error_message (icmp0->type)) { new_id0 = port; if (PREDICT_FALSE (new_id0 != echo0->identifier)) { old_id0 = echo0->identifier; new_id0 = 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; } /* update inner destination IP address */ old_addr0 = inner_ip0->dst_address.as_u32; inner_ip0->dst_address = 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); /* update inner IP header checksum */ old_checksum0 = inner_ip0->checksum; sum0 = inner_ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); inner_ip0->checksum = ip_csum_fold (sum0); new_checksum0 = inner_ip0->checksum; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_checksum0, new_checksum0, ip4_header_t, checksum); icmp0->checksum = ip_csum_fold (sum0); switch (protocol) { case NAT_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 = 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 NAT_PROTOCOL_UDP: case NAT_PROTOCOL_TCP: old_id0 = ((tcp_udp_header_t *) l4_header)->dst_port; new_id0 = 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); } } } if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0) { if (0 != snat_icmp_hairpinning (sm, b0, ip0, icmp0, sm->endpoint_dependent)) vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index; } out: return next0; } #endif 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) { vlib_main_t *vm = vlib_get_main (); 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)) { /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); } return next0; } static int nat_in2out_sm_unknown_proto (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip, u32 rx_fib_index) { clib_bihash_kv_8_8_t kv, value; snat_static_mapping_t *m; u32 old_addr, new_addr; ip_csum_t sum; init_nat_k (&kv, ip->src_address, 0, rx_fib_index, 0); if (clib_bihash_search_8_8 (&sm->static_mapping_by_local, &kv, &value)) return 1; m = pool_elt_at_index (sm->static_mappings, value.value); old_addr = ip->src_address.as_u32; new_addr = ip->src_address.as_u32 = m->external_addr.as_u32; sum = ip->checksum; sum = ip_csum_update (sum, old_addr, new_addr, ip4_header_t, src_address); ip->checksum = ip_csum_fold (sum); /* Hairpinning */ if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0) { vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index; nat_hairpinning_sm_unknown_proto (sm, b, ip); } return 0; } 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; snat_main_t *sm = &snat_main; f64 now = vlib_time_now (vm); u32 thread_index = vm->thread_index; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b = bufs; u16 nexts[VLIB_FRAME_SIZE], *next = nexts; vlib_get_buffers (vm, from, b, n_left_from); while (n_left_from >= 2) { 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; 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; b0 = *b; b++; b1 = *b; b++; /* Prefetch next iteration. */ if (PREDICT_TRUE (n_left_from >= 4)) { vlib_buffer_t *p2, *p3; p2 = *b; p3 = *(b + 1); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, LOAD); CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, LOAD); } if (is_output_feature) iph_offset0 = vnet_buffer (b0)->ip.reass.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_nat_proto (ip0->protocol); /* Next configured feature, probably ip4-lookup */ if (is_slow_path) { if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { if (nat_in2out_sm_unknown_proto (sm, b0, ip0, rx_fib_index0)) { next0 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. other : &sm->counters.fastpath. in2out.other, thread_index, sw_if_index0, 1); goto trace00; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = icmp_in2out_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. icmp : &sm->counters.fastpath. in2out.icmp, thread_index, sw_if_index0, 1); goto trace00; } } else { if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace00; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace00; } } init_nat_k (&kv0, ip0->src_address, vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0, proto0); 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, vnet_buffer (b0)->ip.reass.l4_src_port, vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index, sw_if_index0))) goto trace00; /* * Send DHCP packets to the ipv4 stack, or we won't * be able to use dhcp client on the outside interface */ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_UDP && (vnet_buffer (b0)->ip.reass.l4_dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server)) && ip0->dst_address.as_u32 == 0xffffffff)) 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, ip0->src_address, vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0, proto0, &s0, node, next0, thread_index, now); if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) goto trace00; if (PREDICT_FALSE (!s0)) 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 == NAT_PROTOCOL_TCP)) { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port; new_port0 = udp0->src_port = s0->out2in.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 */ ); mss_clamping (sm->mss_clamping, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out.tcp : &sm-> counters.fastpath.in2out.tcp, thread_index, sw_if_index0, 1); } else { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { udp0->src_port = s0->out2in.port; if (PREDICT_FALSE (udp0->checksum)) { old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port; new_port0 = udp0->src_port; sum0 = udp0->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 */ ); udp0->checksum = ip_csum_fold (sum0); } } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out.udp : &sm-> counters.fastpath.in2out.udp, thread_index, sw_if_index0, 1); } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace00: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { 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; } if (next0 == SNAT_IN2OUT_NEXT_DROP) { vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. drops : &sm->counters.fastpath. in2out.drops, thread_index, sw_if_index0, 1); } if (is_output_feature) iph_offset1 = vnet_buffer (b1)->ip.reass.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_nat_proto (ip1->protocol); /* Next configured feature, probably ip4-lookup */ if (is_slow_path) { if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER)) { if (nat_in2out_sm_unknown_proto (sm, b1, ip1, rx_fib_index1)) { next1 = SNAT_IN2OUT_NEXT_DROP; b1->error = node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. other : &sm->counters.fastpath. in2out.other, thread_index, sw_if_index1, 1); goto trace01; } if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) { next1 = icmp_in2out_slow_path (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, next1, now, thread_index, &s1); vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. icmp : &sm->counters.fastpath. in2out.icmp, thread_index, sw_if_index1, 1); goto trace01; } } else { if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER)) { next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace01; } if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) { next1 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace01; } } init_nat_k (&kv1, ip1->src_address, vnet_buffer (b1)->ip.reass.l4_src_port, rx_fib_index1, proto1); 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, vnet_buffer (b1)->ip.reass.l4_src_port, vnet_buffer (b1)->ip.reass.l4_dst_port, thread_index, sw_if_index1))) goto trace01; /* * Send DHCP packets to the ipv4 stack, or we won't * be able to use dhcp client on the outside interface */ if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_UDP && (vnet_buffer (b1)->ip.reass.l4_dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server)) && ip1->dst_address.as_u32 == 0xffffffff)) 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, ip1->src_address, vnet_buffer (b1)->ip.reass.l4_src_port, rx_fib_index1, proto1, &s1, node, next1, thread_index, now); if (PREDICT_FALSE (next1 == SNAT_IN2OUT_NEXT_DROP)) goto trace01; if (PREDICT_FALSE (!s1)) 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); b1->flags |= VNET_BUFFER_F_IS_NATED; 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 == NAT_PROTOCOL_TCP)) { if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment) { old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port; new_port1 = udp1->src_port = s1->out2in.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 */ ); mss_clamping (sm->mss_clamping, tcp1, &sum1); tcp1->checksum = ip_csum_fold (sum1); } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out.tcp : &sm-> counters.fastpath.in2out.tcp, thread_index, sw_if_index1, 1); } else { if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment) { udp1->src_port = s1->out2in.port; if (PREDICT_FALSE (udp1->checksum)) { old_port1 = vnet_buffer (b1)->ip.reass.l4_src_port; new_port1 = udp1->src_port; sum1 = udp1->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 */ ); udp1->checksum = ip_csum_fold (sum1); } } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out.udp : &sm-> counters.fastpath.in2out.udp, thread_index, sw_if_index1, 1); } /* Accounting */ nat44_session_update_counters (s1, now, vlib_buffer_length_in_chain (vm, b1), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s1, thread_index); trace01: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { 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; } if (next1 == SNAT_IN2OUT_NEXT_DROP) { vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. drops : &sm->counters.fastpath. in2out.drops, thread_index, sw_if_index1, 1); } n_left_from -= 2; next[0] = next0; next[1] = next1; next += 2; } while (n_left_from > 0) { 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; u32 rx_fib_index0; u32 proto0; snat_session_t *s0 = 0; clib_bihash_kv_8_8_t kv0, value0; u32 iph_offset0 = 0; b0 = *b; b++; next0 = SNAT_IN2OUT_NEXT_LOOKUP; if (is_output_feature) iph_offset0 = vnet_buffer (b0)->ip.reass.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_nat_proto (ip0->protocol); /* Next configured feature, probably ip4-lookup */ if (is_slow_path) { if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { if (nat_in2out_sm_unknown_proto (sm, b0, ip0, rx_fib_index0)) { next0 = SNAT_IN2OUT_NEXT_DROP; b0->error = node->errors[SNAT_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. other : &sm->counters.fastpath. in2out.other, thread_index, sw_if_index0, 1); goto trace0; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = icmp_in2out_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. icmp : &sm->counters.fastpath. in2out.icmp, thread_index, sw_if_index0, 1); goto trace0; } } else { if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace0; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = SNAT_IN2OUT_NEXT_SLOW_PATH; goto trace0; } } init_nat_k (&kv0, ip0->src_address, vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0, proto0); 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, vnet_buffer (b0)->ip.reass.l4_src_port, vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index, sw_if_index0))) goto trace0; /* * Send DHCP packets to the ipv4 stack, or we won't * be able to use dhcp client on the outside interface */ if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_UDP && (vnet_buffer (b0)->ip.reass.l4_dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_server)) && ip0->dst_address.as_u32 == 0xffffffff)) 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, ip0->src_address, vnet_buffer (b0)->ip.reass.l4_src_port, rx_fib_index0, proto0, &s0, node, next0, thread_index, now); if (PREDICT_FALSE (next0 == SNAT_IN2OUT_NEXT_DROP)) goto trace0; if (PREDICT_FALSE (!s0)) 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 == NAT_PROTOCOL_TCP)) { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port; new_port0 = udp0->src_port = s0->out2in.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 */ ); mss_clamping (sm->mss_clamping, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out.tcp : &sm-> counters.fastpath.in2out.tcp, thread_index, sw_if_index0, 1); } else { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { udp0->src_port = s0->out2in.port; if (PREDICT_FALSE (udp0->checksum)) { old_port0 = vnet_buffer (b0)->ip.reass.l4_src_port; new_port0 = udp0->src_port; sum0 = udp0->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 */ ); udp0->checksum = ip_csum_fold (sum0); } } vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out.udp : &sm-> counters.fastpath.in2out.udp, thread_index, sw_if_index0, 1); } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { 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; } if (next0 == SNAT_IN2OUT_NEXT_DROP) { vlib_increment_simple_counter (is_slow_path ? &sm-> counters.slowpath.in2out. drops : &sm->counters.fastpath. in2out.drops, thread_index, sw_if_index0, 1); } n_left_from--; next[0] = next0; next++; } vlib_buffer_enqueue_to_next (vm, node, from, (u16 *) nexts, frame->n_vectors); return frame->n_vectors; } VLIB_NODE_FN (snat_in2out_node) (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); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_in2out_node) = { .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", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (snat_in2out_output_node) (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); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_in2out_output_node) = { .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", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (snat_in2out_slowpath_node) (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); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_in2out_slowpath_node) = { .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", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (snat_in2out_output_slowpath_node) (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); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_in2out_output_slowpath_node) = { .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", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (snat_in2out_fast_node) (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; snat_main_t *sm = &snat_main; int is_hairpinning = 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; 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; u32 proto0; u32 rx_fib_index0; ip4_address_t sm0_addr; u16 sm0_port; u32 sm0_fib_index; /* 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_nat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) goto trace0; if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = icmp_in2out (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, ~0, 0, 0); goto trace0; } if (snat_static_mapping_match (sm, ip0->src_address, udp0->src_port, rx_fib_index0, proto0, &sm0_addr, &sm0_port, &sm0_fib_index, 0, 0, 0, 0, 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)) { old_port0 = udp0->src_port; udp0->src_port = new_port0; if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) { 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 */ ); mss_clamping (sm->mss_clamping, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); } else if (udp0->checksum) { sum0 = udp0->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 */ ); udp0->checksum = ip_csum_fold (sum0); } } else { if (PREDICT_TRUE (proto0 == NAT_PROTOCOL_TCP)) { sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); mss_clamping (sm->mss_clamping, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); } else if (udp0->checksum) { sum0 = udp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); udp0->checksum = ip_csum_fold (sum0); } } /* Hairpinning */ snat_hairpinning (vm, node, sm, b0, ip0, udp0, tcp0, proto0, 0, 0 /* do_trace */ ); is_hairpinning = 1; 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; t->is_hairpinning = is_hairpinning; } if (next0 != SNAT_IN2OUT_NEXT_DROP) { vlib_increment_simple_counter (&sm->counters.fastpath. in2out.other, sw_if_index0, vm->thread_index, 1); } /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_in2out_fast_node) = { .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", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */