/* * 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 EI inside to outside network translation */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include extern vnet_feature_arc_registration_t vnet_feat_arc_ip4_local; #define foreach_nat44_ei_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") #define foreach_nat44_ei_hairpinning_handoff_error \ _ (CONGESTION_DROP, "congestion drop") typedef enum { #define _(sym, str) NAT44_EI_IN2OUT_ERROR_##sym, foreach_nat44_ei_in2out_error #undef _ NAT44_EI_IN2OUT_N_ERROR, } nat44_ei_in2out_error_t; static char *nat44_ei_in2out_error_strings[] = { #define _(sym,string) string, foreach_nat44_ei_in2out_error #undef _ }; typedef enum { #define _(sym, str) NAT44_EI_HAIRPINNING_HANDOFF_ERROR_##sym, foreach_nat44_ei_hairpinning_handoff_error #undef _ NAT44_EI_HAIRPINNING_HANDOFF_N_ERROR, } nat44_ei_hairpinning_handoff_error_t; static char *nat44_ei_hairpinning_handoff_error_strings[] = { #define _(sym, string) string, foreach_nat44_ei_hairpinning_handoff_error #undef _ }; typedef enum { NAT44_EI_IN2OUT_NEXT_LOOKUP, NAT44_EI_IN2OUT_NEXT_DROP, NAT44_EI_IN2OUT_NEXT_ICMP_ERROR, NAT44_EI_IN2OUT_NEXT_SLOW_PATH, NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF, NAT44_EI_IN2OUT_N_NEXT, } nat44_ei_in2out_next_t; typedef enum { NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP, NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_LOOKUP, NAT44_EI_IN2OUT_HAIRPINNING_FINISH_N_NEXT, } nat44_ei_in2out_hairpinnig_finish_next_t; typedef enum { NAT44_EI_HAIRPIN_NEXT_LOOKUP, NAT44_EI_HAIRPIN_NEXT_DROP, NAT44_EI_HAIRPIN_NEXT_HANDOFF, NAT44_EI_HAIRPIN_N_NEXT, } nat44_ei_hairpin_next_t; typedef struct { u32 sw_if_index; u32 next_index; u32 session_index; u32 is_slow_path; u32 is_hairpinning; } nat44_ei_in2out_trace_t; typedef struct { ip4_address_t addr; u16 port; u32 fib_index; u32 session_index; } nat44_ei_hairpin_trace_t; typedef struct { u32 next_worker_index; } nat44_ei_hairpinning_handoff_trace_t; static u8 * format_nat44_ei_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 *); nat44_ei_in2out_trace_t *t = va_arg (*args, nat44_ei_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_nat44_ei_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 *); nat44_ei_in2out_trace_t *t = va_arg (*args, nat44_ei_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_nat44_ei_hairpin_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_ei_hairpin_trace_t *t = va_arg (*args, nat44_ei_hairpin_trace_t *); s = format (s, "new dst addr %U port %u fib-index %u", format_ip4_address, &t->addr, clib_net_to_host_u16 (t->port), t->fib_index); if (~0 == t->session_index) { s = format (s, " is-static-mapping"); } else { s = format (s, " session-index %u", t->session_index); } return s; } static u8 * format_nat44_ei_hairpinning_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 *); nat44_ei_hairpinning_handoff_trace_t *t = va_arg (*args, nat44_ei_hairpinning_handoff_trace_t *); s = format (s, "nat44-ei-hairpinning-handoff: next-worker %d", t->next_worker_index); return s; } static_always_inline int nat44_ei_not_translate_fast (vlib_node_runtime_t *node, u32 sw_if_index0, ip4_header_t *ip0, u32 proto0, u32 rx_fib_index0) { nat44_ei_main_t *nm = &nat44_ei_main; if (nm->out2in_dpo) return 0; fib_node_index_t fei = FIB_NODE_INDEX_INVALID; nat44_ei_outside_fib_t *outside_fib; 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 (nat44_ei_is_interface_addr ( nm->ip4_main, 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) { vec_foreach (outside_fib, nm->outside_fibs) { fei = fib_table_lookup (outside_fib->fib_index, &pfx); if (FIB_NODE_INDEX_INVALID != fei) { sw_if_index = fib_entry_get_resolving_interface (fei); if (sw_if_index != ~0) break; } } } if (sw_if_index == ~0) return 1; nat44_ei_interface_t *i; pool_foreach (i, nm->interfaces) { /* NAT packet aimed at outside interface */ if ((nat44_ei_interface_is_outside (i)) && (sw_if_index == i->sw_if_index)) return 0; } } return 1; } static_always_inline int nat44_ei_not_translate (nat44_ei_main_t *nm, 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, nm->outside_fib_index, proto0); /* NAT packet aimed at external address if */ /* has active sessions */ if (clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0)) { /* or is static mappings */ ip4_address_t placeholder_addr; u16 placeholder_port; u32 placeholder_fib_index; if (!nat44_ei_static_mapping_match (ip0->dst_address, udp0->dst_port, nm->outside_fib_index, proto0, &placeholder_addr, &placeholder_port, &placeholder_fib_index, 1, 0, 0)) return 0; } else return 0; if (nm->forwarding_enabled) return 1; return nat44_ei_not_translate_fast (node, sw_if_index0, ip0, proto0, rx_fib_index0); } static_always_inline int nat44_ei_not_translate_output_feature (nat44_ei_main_t *nm, 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; nat44_ei_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 (&nm->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 (&nm->in2out, &kv0, &value0)) { /* hairpinning */ pool_foreach (i, nm->output_feature_interfaces) { if ((nat44_ei_interface_is_inside (i)) && (sw_if_index == i->sw_if_index)) return 0; } return 1; } return 0; } #ifndef CLIB_MARCH_VARIANT int nat44_i2o_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg) { nat44_ei_main_t *nm = &nat44_ei_main; nat44_ei_is_idle_session_ctx_t *ctx = arg; nat44_ei_session_t *s; u64 sess_timeout_time; nat44_ei_main_per_thread_data_t *tnm = vec_elt_at_index (nm->per_thread_data, ctx->thread_index); clib_bihash_kv_8_8_t s_kv; if (ctx->thread_index != nat_value_get_thread_index (kv)) { return 0; } s = pool_elt_at_index (tnm->sessions, nat_value_get_session_index (kv)); sess_timeout_time = s->last_heard + (f64) nat_session_get_timeout ( &nm->timeouts, s->nat_proto, s->state); if (ctx->now >= sess_timeout_time) { init_nat_o2i_k (&s_kv, s); if (clib_bihash_add_del_8_8 (&nm->out2in, &s_kv, 0)) nat_elog_warn (nm, "out2in key del failed"); nat_ipfix_logging_nat44_ses_delete ( ctx->thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32, nat_proto_to_ip_proto (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 (!nat44_ei_is_session_static (s)) nat44_ei_free_outside_address_and_port ( nm->addresses, ctx->thread_index, &s->out2in.addr, s->out2in.port, s->nat_proto); nat44_ei_delete_session (nm, s, ctx->thread_index); return 1; } return 0; } #endif static u32 slow_path (nat44_ei_main_t *nm, 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, nat44_ei_session_t **sessionp, vlib_node_runtime_t *node, u32 next0, u32 thread_index, f64 now) { nat44_ei_user_t *u; nat44_ei_session_t *s = 0; clib_bihash_kv_8_8_t kv0; u8 is_sm = 0; nat44_ei_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_ei_is_idle_session_ctx_t ctx0; ip4_address_t sm_addr; u16 sm_port; u32 sm_fib_index; if (PREDICT_FALSE (nat44_ei_maximum_sessions_exceeded (nm, thread_index))) { b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_MAX_SESSIONS_EXCEEDED]; nat_ipfix_logging_max_sessions (thread_index, nm->max_translations_per_thread); nat_elog_notice (nm, "maximum sessions exceeded"); return NAT44_EI_IN2OUT_NEXT_DROP; } /* First try to match static mapping by local address and port */ if (nat44_ei_static_mapping_match (i2o_addr, i2o_port, rx_fib_index0, nat_proto, &sm_addr, &sm_port, &sm_fib_index, 0, 0, &identity_nat)) { /* Try to create dynamic translation */ if (nm->alloc_addr_and_port ( nm->addresses, rx_fib_index0, thread_index, nat_proto, ip0->src_address, &sm_addr, &sm_port, nm->port_per_thread, nm->per_thread_data[thread_index].snat_thread_index)) { b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_OUT_OF_PORTS]; return NAT44_EI_IN2OUT_NEXT_DROP; } } else { if (PREDICT_FALSE (identity_nat)) { *sessionp = s; return next0; } is_sm = 1; } u = nat44_ei_user_get_or_create (nm, &ip0->src_address, rx_fib_index0, thread_index); if (!u) { b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_CANNOT_CREATE_USER]; return NAT44_EI_IN2OUT_NEXT_DROP; } s = nat44_ei_session_alloc_or_recycle (nm, u, thread_index, now); if (!s) { nat44_ei_delete_user_with_no_session (nm, u, thread_index); nat_elog_warn (nm, "create NAT session failed"); return NAT44_EI_IN2OUT_NEXT_DROP; } if (is_sm) s->flags |= NAT44_EI_SESSION_FLAG_STATIC_MAPPING; nat44_ei_user_session_increment (nm, 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 = nm->outside_fib_index; switch (vec_len (nm->outside_fibs)) { case 0: s->out2in.fib_index = nm->outside_fib_index; break; case 1: s->out2in.fib_index = nm->outside_fibs[0].fib_index; break; default: vec_foreach (outside_fib, nm->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; } } } 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, thread_index, s - nm->per_thread_data[thread_index].sessions); if (clib_bihash_add_or_overwrite_stale_8_8 ( &nm->in2out, &kv0, nat44_i2o_is_idle_session_cb, &ctx0)) nat_elog_notice (nm, "in2out key add failed"); init_nat_o2i_kv (&kv0, s, thread_index, s - nm->per_thread_data[thread_index].sessions); if (clib_bihash_add_or_overwrite_stale_8_8 ( &nm->out2in, &kv0, nat44_o2i_is_idle_session_cb, &ctx0)) nat_elog_notice (nm, "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, nat_proto_to_ip_proto (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; } static_always_inline nat44_ei_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 NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL; } } return -1; /* success */ } static_always_inline u32 nat44_ei_icmp_match_in2out_slow (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, nat44_ei_session_t **p_s0, u8 *dont_translate) { nat44_ei_main_t *nm = &nat44_ei_main; nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[thread_index]; u32 sw_if_index0; nat44_ei_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 = NAT44_EI_IN2OUT_NEXT_DROP; goto out; } init_nat_k (&kv0, *addr, *port, *fib_index, *proto); if (clib_bihash_search_8_8 (&nm->in2out, &kv0, &value0)) { if (vnet_buffer (b0)->sw_if_index[VLIB_TX] != ~0) { if (PREDICT_FALSE (nat44_ei_not_translate_output_feature ( nm, ip0, *proto, *port, *port, thread_index, sw_if_index0))) { *dont_translate = 1; goto out; } } else { if (PREDICT_FALSE (nat44_ei_not_translate ( nm, 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[NAT44_EI_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = NAT44_EI_IN2OUT_NEXT_DROP; goto out; } next0 = slow_path (nm, b0, ip0, *addr, *port, *fib_index, *proto, &s0, node, next0, thread_index, vlib_time_now (vm)); if (PREDICT_FALSE (next0 == NAT44_EI_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[NAT44_EI_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = NAT44_EI_IN2OUT_NEXT_DROP; goto out; } s0 = pool_elt_at_index (tnm->sessions, nat_value_get_session_index (&value0)); } out: if (s0) { *addr = s0->out2in.addr; *port = s0->out2in.port; *fib_index = s0->out2in.fib_index; } if (p_s0) *p_s0 = s0; return next0; } static_always_inline u32 nat44_ei_icmp_match_in2out_fast (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, nat44_ei_session_t **s0, 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 = NAT44_EI_IN2OUT_NEXT_DROP; goto out; } ip4_address_t sm_addr; u16 sm_port; u32 sm_fib_index; if (nat44_ei_static_mapping_match (*addr, *port, *fib_index, *proto, &sm_addr, &sm_port, &sm_fib_index, 0, &is_addr_only, 0)) { if (PREDICT_FALSE (nat44_ei_not_translate_fast ( 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 = NAT44_EI_IN2OUT_NEXT_DROP; goto out; } b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_NO_TRANSLATION]; next0 = NAT44_EI_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[NAT44_EI_IN2OUT_ERROR_BAD_ICMP_TYPE]; next0 = NAT44_EI_IN2OUT_NEXT_DROP; goto out; } out: return next0; } static_always_inline u32 nat44_ei_icmp_hairpinning (nat44_ei_main_t *nm, vlib_buffer_t *b0, u32 thread_index, ip4_header_t *ip0, icmp46_header_t *icmp0, u32 *required_thread_index) { clib_bihash_kv_8_8_t kv0, value0; u32 old_dst_addr0, new_dst_addr0; u32 old_addr0, new_addr0; u16 old_port0, new_port0; u16 old_checksum0, new_checksum0; u32 si, ti = 0; ip_csum_t sum0; nat44_ei_session_t *s0; nat44_ei_static_mapping_t *m0; if (icmp_type_is_error_message ( vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags)) { ip4_header_t *inner_ip0 = 0; tcp_udp_header_t *l4_header = 0; inner_ip0 = (ip4_header_t *) ((icmp_echo_header_t *) (icmp0 + 1) + 1); l4_header = ip4_next_header (inner_ip0); u32 protocol = ip_proto_to_nat_proto (inner_ip0->protocol); if (protocol != NAT_PROTOCOL_TCP && protocol != NAT_PROTOCOL_UDP) return 1; init_nat_k (&kv0, ip0->dst_address, l4_header->src_port, nm->outside_fib_index, protocol); if (clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0)) return 1; ti = nat_value_get_thread_index (&value0); if (ti != thread_index) { *required_thread_index = ti; return 1; } si = nat_value_get_session_index (&value0); s0 = pool_elt_at_index (nm->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; /* update inner source IP address */ old_addr0 = inner_ip0->src_address.as_u32; inner_ip0->src_address.as_u32 = new_dst_addr0; new_addr0 = inner_ip0->src_address.as_u32; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, src_address); 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, src_address); 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); /* update inner source port */ old_port0 = l4_header->src_port; l4_header->src_port = s0->in2out.port; new_port0 = l4_header->src_port; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_port0, new_port0, tcp_udp_header_t, src_port); icmp0->checksum = ip_csum_fold (sum0); } else { init_nat_k (&kv0, ip0->dst_address, 0, nm->outside_fib_index, 0); if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv0, &value0)) { icmp_echo_header_t *echo0 = (icmp_echo_header_t *) (icmp0 + 1); u16 icmp_id0 = echo0->identifier; init_nat_k (&kv0, ip0->dst_address, icmp_id0, nm->outside_fib_index, NAT_PROTOCOL_ICMP); int rv = clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0); if (!rv) { ti = nat_value_get_thread_index (&value0); if (ti != thread_index) { *required_thread_index = ti; return 1; } si = nat_value_get_session_index (&value0); s0 = pool_elt_at_index (nm->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); goto change_addr; } return 1; } m0 = pool_elt_at_index (nm->static_mappings, value0.value); new_dst_addr0 = m0->local_addr.as_u32; if (vnet_buffer (b0)->sw_if_index[VLIB_TX] == ~0) vnet_buffer (b0)->sw_if_index[VLIB_TX] = m0->fib_index; } change_addr: /* 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); } return 0; } static_always_inline u32 nat44_ei_icmp_in2out (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, nat44_ei_session_t **p_s0) { nat44_ei_main_t *nm = &nat44_ei_main; vlib_main_t *vm = vlib_get_main (); ip4_address_t addr; u16 port = 0; u32 fib_index; nat_protocol_t proto; 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; u32 required_thread_index = thread_index; echo0 = (icmp_echo_header_t *) (icmp0 + 1); if (PREDICT_TRUE (nm->pat)) { next0_tmp = nat44_ei_icmp_match_in2out_slow ( node, thread_index, b0, ip0, &addr, &port, &fib_index, &proto, p_s0, &dont_translate); } else { next0_tmp = nat44_ei_icmp_match_in2out_fast ( node, thread_index, b0, ip0, &addr, &port, &fib_index, &proto, p_s0, &dont_translate); } if (next0_tmp != ~0) next0 = next0_tmp; if (next0 == NAT44_EI_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 = NAT44_EI_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 = NAT44_EI_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 (proto) { 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 != nat44_ei_icmp_hairpinning (nm, b0, thread_index, ip0, icmp0, &required_thread_index)) vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index; if (thread_index != required_thread_index) { vnet_buffer (b0)->snat.required_thread_index = required_thread_index; next0 = NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF; } } out: return next0; } static_always_inline u32 nat44_ei_icmp_in2out_slow_path (nat44_ei_main_t *nm, 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, nat44_ei_session_t **p_s0) { vlib_main_t *vm = vlib_get_main (); next0 = nat44_ei_icmp_in2out (b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, thread_index, p_s0); nat44_ei_session_t *s0 = *p_s0; if (PREDICT_TRUE (next0 != NAT44_EI_IN2OUT_NEXT_DROP && s0)) { /* Accounting */ nat44_ei_session_update_counters ( s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_ei_session_update_lru (nm, s0, thread_index); } return next0; } static_always_inline void nat44_ei_hairpinning_sm_unknown_proto (nat44_ei_main_t *nm, vlib_buffer_t *b, ip4_header_t *ip) { clib_bihash_kv_8_8_t kv, value; nat44_ei_static_mapping_t *m; u32 old_addr, new_addr; ip_csum_t sum; init_nat_k (&kv, ip->dst_address, 0, 0, 0); if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv, &value)) return; m = pool_elt_at_index (nm->static_mappings, value.value); old_addr = ip->dst_address.as_u32; new_addr = ip->dst_address.as_u32 = m->local_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); if (vnet_buffer (b)->sw_if_index[VLIB_TX] == ~0) vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index; } static int nat_in2out_sm_unknown_proto (nat44_ei_main_t *nm, vlib_buffer_t *b, ip4_header_t *ip, u32 rx_fib_index) { clib_bihash_kv_8_8_t kv, value; nat44_ei_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 (&nm->static_mapping_by_local, &kv, &value)) return 1; m = pool_elt_at_index (nm->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; nat44_ei_hairpinning_sm_unknown_proto (nm, b, ip); } return 0; } static_always_inline int nat44_ei_hairpinning (vlib_main_t *vm, vlib_node_runtime_t *node, nat44_ei_main_t *nm, u32 thread_index, vlib_buffer_t *b0, ip4_header_t *ip0, udp_header_t *udp0, tcp_header_t *tcp0, u32 proto0, int do_trace, u32 *required_thread_index) { nat44_ei_session_t *s0 = NULL; clib_bihash_kv_8_8_t kv0, value0; ip_csum_t sum0; u32 new_dst_addr0 = 0, old_dst_addr0, si = ~0; u16 new_dst_port0 = ~0, old_dst_port0; int rv; ip4_address_t sm0_addr; u16 sm0_port; u32 sm0_fib_index; u32 old_sw_if_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; /* Check if destination is static mappings */ if (!nat44_ei_static_mapping_match ( ip0->dst_address, udp0->dst_port, nm->outside_fib_index, proto0, &sm0_addr, &sm0_port, &sm0_fib_index, 1 /* by external */, 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 { init_nat_k (&kv0, ip0->dst_address, udp0->dst_port, nm->outside_fib_index, proto0); rv = clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0); if (rv) { rv = 0; goto trace; } if (thread_index != nat_value_get_thread_index (&value0)) { *required_thread_index = nat_value_get_thread_index (&value0); return 0; } si = nat_value_get_session_index (&value0); s0 = pool_elt_at_index (nm->per_thread_data[thread_index].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; } /* Check if anything has changed and if not, then return 0. This helps avoid infinite loop, repeating the three nodes nat44-hairpinning-->ip4-lookup-->ip4-local, in case nothing has changed. */ old_dst_addr0 = ip0->dst_address.as_u32; old_dst_port0 = tcp0->dst; if (new_dst_addr0 == old_dst_addr0 && new_dst_port0 == old_dst_port0 && vnet_buffer (b0)->sw_if_index[VLIB_TX] == old_sw_if_index) return 0; /* 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 == NAT_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 == NAT_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); } } rv = 1; goto trace; } rv = 0; trace: if (do_trace && PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_hairpin_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->addr.as_u32 = new_dst_addr0; t->port = new_dst_port0; t->fib_index = vnet_buffer (b0)->sw_if_index[VLIB_TX]; if (s0) { t->session_index = si; } else { t->session_index = ~0; } } return rv; } static_always_inline uword nat44_ei_hairpinning_handoff_fn_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame, u32 fq_index) { vlib_buffer_t *bufs[VLIB_FRAME_SIZE], **b; u32 n_enq, n_left_from, *from; u16 thread_indices[VLIB_FRAME_SIZE], *ti; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; vlib_get_buffers (vm, from, bufs, n_left_from); b = bufs; ti = thread_indices; while (n_left_from > 0) { ti[0] = vnet_buffer (b[0])->snat.required_thread_index; if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b[0]->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_hairpinning_handoff_trace_t *t = vlib_add_trace (vm, node, b[0], sizeof (*t)); t->next_worker_index = ti[0]; } n_left_from -= 1; ti += 1; b += 1; } n_enq = vlib_buffer_enqueue_to_thread (vm, node, fq_index, from, thread_indices, frame->n_vectors, 1); if (n_enq < frame->n_vectors) vlib_node_increment_counter ( vm, node->node_index, NAT44_EI_HAIRPINNING_HANDOFF_ERROR_CONGESTION_DROP, frame->n_vectors - n_enq); return frame->n_vectors; } static_always_inline uword nat44_ei_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; nat44_ei_main_t *nm = &nat44_ei_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 rx_sw_if_index0, rx_sw_if_index1; u32 tx_sw_if_index0, tx_sw_if_index1; u32 cntr_sw_if_index0, cntr_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; nat44_ei_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_load (p2->data); clib_prefetch_load (p3->data); } 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; rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; tx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; cntr_sw_if_index0 = is_output_feature ? tx_sw_if_index0 : rx_sw_if_index0; rx_fib_index0 = vec_elt (nm->ip4_main->fib_index_by_sw_if_index, rx_sw_if_index0); next0 = next1 = NAT44_EI_IN2OUT_NEXT_LOOKUP; if (PREDICT_FALSE (!is_output_feature && 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 = NAT44_EI_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 (nm, b0, ip0, rx_fib_index0)) { next0 = NAT44_EI_IN2OUT_NEXT_DROP; b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; } vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.other : &nm->counters.fastpath.in2out.other, thread_index, cntr_sw_if_index0, 1); goto trace00; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = nat44_ei_icmp_in2out_slow_path ( nm, b0, ip0, icmp0, rx_sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.icmp : &nm->counters.fastpath.in2out.icmp, thread_index, cntr_sw_if_index0, 1); goto trace00; } } else { if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH; goto trace00; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = NAT44_EI_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 (&nm->in2out, &kv0, &value0) != 0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE (nat44_ei_not_translate_output_feature ( nm, ip0, proto0, vnet_buffer (b0)->ip.reass.l4_src_port, vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index, rx_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 (nat44_ei_not_translate ( nm, node, rx_sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) goto trace00; } next0 = slow_path (nm, 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 == NAT44_EI_IN2OUT_NEXT_DROP)) goto trace00; if (PREDICT_FALSE (!s0)) goto trace00; } else { next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH; goto trace00; } } else s0 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions, nat_value_get_session_index (&value0)); 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 (nm->mss_clamping, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); } vlib_increment_simple_counter (is_slow_path ? &nm->counters.slowpath.in2out.tcp : &nm->counters.fastpath.in2out.tcp, thread_index, cntr_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 ? &nm->counters.slowpath.in2out.udp : &nm->counters.fastpath.in2out.udp, thread_index, cntr_sw_if_index0, 1); } /* Accounting */ nat44_ei_session_update_counters ( s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_ei_session_update_lru (nm, s0, thread_index); trace00: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_in2out_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = rx_sw_if_index0; t->next_index = next0; t->session_index = ~0; if (s0) t->session_index = s0 - nm->per_thread_data[thread_index].sessions; } if (next0 == NAT44_EI_IN2OUT_NEXT_DROP) { vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.drops : &nm->counters.fastpath.in2out.drops, thread_index, cntr_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; rx_sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; tx_sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_TX]; cntr_sw_if_index1 = is_output_feature ? tx_sw_if_index1 : rx_sw_if_index1; rx_fib_index1 = vec_elt (nm->ip4_main->fib_index_by_sw_if_index, rx_sw_if_index1); if (PREDICT_FALSE (!is_output_feature && 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 = NAT44_EI_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 (nm, b1, ip1, rx_fib_index1)) { next1 = NAT44_EI_IN2OUT_NEXT_DROP; b1->error = node->errors[NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; } vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.other : &nm->counters.fastpath.in2out.other, thread_index, cntr_sw_if_index1, 1); goto trace01; } if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) { next1 = nat44_ei_icmp_in2out_slow_path ( nm, b1, ip1, icmp1, rx_sw_if_index1, rx_fib_index1, node, next1, now, thread_index, &s1); vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.icmp : &nm->counters.fastpath.in2out.icmp, thread_index, cntr_sw_if_index1, 1); goto trace01; } } else { if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER)) { next1 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH; goto trace01; } if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) { next1 = NAT44_EI_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 (&nm->in2out, &kv1, &value1) != 0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE (nat44_ei_not_translate_output_feature ( nm, ip1, proto1, vnet_buffer (b1)->ip.reass.l4_src_port, vnet_buffer (b1)->ip.reass.l4_dst_port, thread_index, rx_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 (nat44_ei_not_translate ( nm, node, rx_sw_if_index1, ip1, proto1, rx_fib_index1, thread_index))) goto trace01; } next1 = slow_path (nm, 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 == NAT44_EI_IN2OUT_NEXT_DROP)) goto trace01; if (PREDICT_FALSE (!s1)) goto trace01; } else { next1 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH; goto trace01; } } else s1 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions, nat_value_get_session_index (&value1)); 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 (nm->mss_clamping, tcp1, &sum1); tcp1->checksum = ip_csum_fold (sum1); } vlib_increment_simple_counter (is_slow_path ? &nm->counters.slowpath.in2out.tcp : &nm->counters.fastpath.in2out.tcp, thread_index, cntr_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 ? &nm->counters.slowpath.in2out.udp : &nm->counters.fastpath.in2out.udp, thread_index, cntr_sw_if_index1, 1); } /* Accounting */ nat44_ei_session_update_counters ( s1, now, vlib_buffer_length_in_chain (vm, b1), thread_index); /* Per-user LRU list maintenance */ nat44_ei_session_update_lru (nm, s1, thread_index); trace01: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_in2out_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->sw_if_index = rx_sw_if_index1; t->next_index = next1; t->session_index = ~0; if (s1) t->session_index = s1 - nm->per_thread_data[thread_index].sessions; } if (next1 == NAT44_EI_IN2OUT_NEXT_DROP) { vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.drops : &nm->counters.fastpath.in2out.drops, thread_index, cntr_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 rx_sw_if_index0; u32 tx_sw_if_index0; u32 cntr_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; nat44_ei_session_t *s0 = 0; clib_bihash_kv_8_8_t kv0, value0; u32 iph_offset0 = 0; b0 = *b; b++; next0 = NAT44_EI_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; rx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; tx_sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_TX]; cntr_sw_if_index0 = is_output_feature ? tx_sw_if_index0 : rx_sw_if_index0; rx_fib_index0 = vec_elt (nm->ip4_main->fib_index_by_sw_if_index, rx_sw_if_index0); if (PREDICT_FALSE (!is_output_feature && 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 = NAT44_EI_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 (nm, b0, ip0, rx_fib_index0)) { next0 = NAT44_EI_IN2OUT_NEXT_DROP; b0->error = node->errors[NAT44_EI_IN2OUT_ERROR_UNSUPPORTED_PROTOCOL]; } vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.other : &nm->counters.fastpath.in2out.other, thread_index, cntr_sw_if_index0, 1); goto trace0; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = nat44_ei_icmp_in2out_slow_path ( nm, b0, ip0, icmp0, rx_sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.icmp : &nm->counters.fastpath.in2out.icmp, thread_index, cntr_sw_if_index0, 1); goto trace0; } } else { if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH; goto trace0; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = NAT44_EI_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 (&nm->in2out, &kv0, &value0)) { if (is_slow_path) { if (is_output_feature) { if (PREDICT_FALSE (nat44_ei_not_translate_output_feature ( nm, ip0, proto0, vnet_buffer (b0)->ip.reass.l4_src_port, vnet_buffer (b0)->ip.reass.l4_dst_port, thread_index, rx_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 (nat44_ei_not_translate ( nm, node, rx_sw_if_index0, ip0, proto0, rx_fib_index0, thread_index))) goto trace0; } next0 = slow_path (nm, 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 == NAT44_EI_IN2OUT_NEXT_DROP)) goto trace0; if (PREDICT_FALSE (!s0)) goto trace0; } else { next0 = NAT44_EI_IN2OUT_NEXT_SLOW_PATH; goto trace0; } } else s0 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions, nat_value_get_session_index (&value0)); 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 (nm->mss_clamping, tcp0, &sum0); tcp0->checksum = ip_csum_fold (sum0); } vlib_increment_simple_counter (is_slow_path ? &nm->counters.slowpath.in2out.tcp : &nm->counters.fastpath.in2out.tcp, thread_index, cntr_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 ? &nm->counters.slowpath.in2out.udp : &nm->counters.fastpath.in2out.udp, thread_index, cntr_sw_if_index0, 1); } /* Accounting */ nat44_ei_session_update_counters ( s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_ei_session_update_lru (nm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_in2out_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = rx_sw_if_index0; t->next_index = next0; t->session_index = ~0; if (s0) t->session_index = s0 - nm->per_thread_data[thread_index].sessions; } if (next0 == NAT44_EI_IN2OUT_NEXT_DROP) { vlib_increment_simple_counter ( is_slow_path ? &nm->counters.slowpath.in2out.drops : &nm->counters.fastpath.in2out.drops, thread_index, cntr_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; } static_always_inline uword nat44_ei_in2out_hairpinning_finish_inline (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { u32 n_left_from, *from, *to_next; u32 thread_index = vm->thread_index; nat44_ei_in2out_next_t next_index; nat44_ei_main_t *nm = &nat44_ei_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; udp_header_t *udp0; tcp_header_t *tcp0; icmp46_header_t *icmp0; u32 proto0; u32 required_thread_index = thread_index; 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 = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_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]; proto0 = ip_proto_to_nat_proto (ip0->protocol); switch (proto0) { case NAT_PROTOCOL_TCP: // fallthrough case NAT_PROTOCOL_UDP: is_hairpinning = nat44_ei_hairpinning ( vm, node, nm, thread_index, b0, ip0, udp0, tcp0, proto0, 0 /* do_trace */, &required_thread_index); break; case NAT_PROTOCOL_ICMP: is_hairpinning = (0 == nat44_ei_icmp_hairpinning ( nm, b0, thread_index, ip0, icmp0, &required_thread_index)); break; case NAT_PROTOCOL_OTHER: // this should never happen next0 = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP; break; } if (thread_index != required_thread_index) { // but we already did a handoff ... next0 = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP; } if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_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 != NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP) { vlib_increment_simple_counter ( &nm->counters.fastpath.in2out.other, sw_if_index0, vm->thread_index, 1); } 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; } VLIB_NODE_FN (nat44_ei_hairpinning_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { u32 n_left_from, *from, *to_next; u32 thread_index = vm->thread_index; nat44_ei_hairpin_next_t next_index; nat44_ei_main_t *nm = &nat44_ei_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; u32 sw_if_index0; u32 required_thread_index = thread_index; 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; sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; proto0 = ip_proto_to_nat_proto (ip0->protocol); int next0_resolved = 0; if (nat44_ei_hairpinning (vm, node, nm, thread_index, b0, ip0, udp0, tcp0, proto0, 1, &required_thread_index)) { next0 = NAT44_EI_HAIRPIN_NEXT_LOOKUP; next0_resolved = 1; } if (thread_index != required_thread_index) { vnet_buffer (b0)->snat.required_thread_index = required_thread_index; next0 = NAT44_EI_HAIRPIN_NEXT_HANDOFF; next0_resolved = 1; } if (!next0_resolved) vnet_get_config_data (&cm->config_main, &b0->current_config_index, &next0, 0); if (next0 != NAT44_EI_HAIRPIN_NEXT_DROP) { vlib_increment_simple_counter ( &nm->counters.hairpinning, vm->thread_index, sw_if_index0, 1); } 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; } VLIB_NODE_FN (nat44_ei_in2out_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_in2out_node_fn_inline (vm, node, frame, 0, 0); } VLIB_NODE_FN (nat44_ei_in2out_output_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_in2out_node_fn_inline (vm, node, frame, 0, 1); } VLIB_NODE_FN (nat44_ei_in2out_slowpath_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_in2out_node_fn_inline (vm, node, frame, 1, 0); } VLIB_NODE_FN (nat44_ei_in2out_output_slowpath_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_in2out_node_fn_inline (vm, node, frame, 1, 1); } VLIB_NODE_FN (nat44_ei_in2out_hairpinning_handoff_ip4_lookup_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_hairpinning_handoff_fn_inline ( vm, node, frame, nat44_ei_main.in2out_hairpinning_finish_ip4_lookup_node_fq_index); } VLIB_NODE_FN (nat44_ei_in2out_hairpinning_handoff_interface_output_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_hairpinning_handoff_fn_inline ( vm, node, frame, nat44_ei_main.in2out_hairpinning_finish_interface_output_node_fq_index); } VLIB_NODE_FN (nat44_ei_in2out_hairpinning_finish_ip4_lookup_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_in2out_hairpinning_finish_inline (vm, node, frame); } VLIB_NODE_FN (nat44_ei_in2out_hairpinning_finish_interface_output_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_in2out_hairpinning_finish_inline (vm, node, frame); } VLIB_NODE_FN (nat44_ei_hairpinning_handoff_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { return nat44_ei_hairpinning_handoff_fn_inline ( vm, node, frame, nat44_ei_main.hairpinning_fq_index); } VLIB_REGISTER_NODE (nat44_ei_in2out_node) = { .name = "nat44-ei-in2out", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings), .error_strings = nat44_ei_in2out_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT, .next_nodes = { [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop", [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-slowpath", [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-ip4-lookup", }, }; VLIB_REGISTER_NODE (nat44_ei_in2out_output_node) = { .name = "nat44-ei-in2out-output", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings), .error_strings = nat44_ei_in2out_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT, .next_nodes = { [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop", [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "interface-output", [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-output-slowpath", [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-interface-output", }, }; VLIB_REGISTER_NODE (nat44_ei_in2out_slowpath_node) = { .name = "nat44-ei-in2out-slowpath", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings), .error_strings = nat44_ei_in2out_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT, .next_nodes = { [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop", [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "ip4-lookup", [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-slowpath", [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-ip4-lookup", }, }; VLIB_REGISTER_NODE (nat44_ei_in2out_output_slowpath_node) = { .name = "nat44-ei-in2out-output-slowpath", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_in2out_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings), .error_strings = nat44_ei_in2out_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_IN2OUT_N_NEXT, .next_nodes = { [NAT44_EI_IN2OUT_NEXT_DROP] = "error-drop", [NAT44_EI_IN2OUT_NEXT_LOOKUP] = "interface-output", [NAT44_EI_IN2OUT_NEXT_SLOW_PATH] = "nat44-ei-in2out-output-slowpath", [NAT44_EI_IN2OUT_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT44_EI_IN2OUT_NEXT_HAIRPINNING_HANDOFF] = "nat44-ei-in2out-hairpinning-handoff-interface-output", }, }; VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_handoff_ip4_lookup_node) = { .name = "nat44-ei-in2out-hairpinning-handoff-ip4-lookup", .vector_size = sizeof (u32), .n_errors = ARRAY_LEN(nat44_ei_hairpinning_handoff_error_strings), .error_strings = nat44_ei_hairpinning_handoff_error_strings, .format_trace = format_nat44_ei_hairpinning_handoff_trace, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_handoff_interface_output_node) = { .name = "nat44-ei-in2out-hairpinning-handoff-interface-output", .vector_size = sizeof (u32), .n_errors = ARRAY_LEN(nat44_ei_hairpinning_handoff_error_strings), .error_strings = nat44_ei_hairpinning_handoff_error_strings, .format_trace = format_nat44_ei_hairpinning_handoff_trace, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_finish_ip4_lookup_node) = { .name = "nat44-ei-in2out-hairpinning-finish-ip4-lookup", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_in2out_fast_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings), .error_strings = nat44_ei_in2out_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_N_NEXT, .next_nodes = { [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP] = "error-drop", [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_LOOKUP] = "ip4-lookup", }, }; VLIB_REGISTER_NODE (nat44_ei_in2out_hairpinning_finish_interface_output_node) = { .name = "nat44-ei-in2out-hairpinning-finish-interface-output", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_in2out_fast_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_in2out_error_strings), .error_strings = nat44_ei_in2out_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_IN2OUT_HAIRPINNING_FINISH_N_NEXT, .next_nodes = { [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_DROP] = "error-drop", [NAT44_EI_IN2OUT_HAIRPINNING_FINISH_NEXT_LOOKUP] = "interface-output", }, }; VLIB_REGISTER_NODE (nat44_ei_hairpinning_handoff_node) = { .name = "nat44-ei-hairpinning-handoff", .vector_size = sizeof (u32), .n_errors = ARRAY_LEN(nat44_ei_hairpinning_handoff_error_strings), .error_strings = nat44_ei_hairpinning_handoff_error_strings, .format_trace = format_nat44_ei_hairpinning_handoff_trace, .n_next_nodes = 1, .next_nodes = { [0] = "error-drop", }, }; VLIB_REGISTER_NODE (nat44_ei_hairpinning_node) = { .name = "nat44-ei-hairpinning", .vector_size = sizeof (u32), .type = VLIB_NODE_TYPE_INTERNAL, .format_trace = format_nat44_ei_hairpin_trace, .n_next_nodes = NAT44_EI_HAIRPIN_N_NEXT, .next_nodes = { [NAT44_EI_HAIRPIN_NEXT_DROP] = "error-drop", [NAT44_EI_HAIRPIN_NEXT_LOOKUP] = "ip4-lookup", [NAT44_EI_HAIRPIN_NEXT_HANDOFF] = "nat44-ei-hairpinning-handoff", }, }; /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */