/* * 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 outside to inside network translation */ #include <vlib/vlib.h> #include <vnet/vnet.h> #include <vnet/ip/ip.h> #include <vnet/ethernet/ethernet.h> #include <vnet/udp/udp_local.h> #include <vnet/fib/ip4_fib.h> #include <vppinfra/hash.h> #include <vppinfra/error.h> #include <nat/lib/log.h> #include <nat/lib/nat_syslog.h> #include <nat/lib/ipfix_logging.h> #include <nat/nat44-ei/nat44_ei_inlines.h> #include <nat/nat44-ei/nat44_ei.h> typedef struct { u32 sw_if_index; u32 next_index; u32 session_index; } nat44_ei_out2in_trace_t; /* packet trace format function */ static u8 * format_nat44_ei_out2in_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_out2in_trace_t *t = va_arg (*args, nat44_ei_out2in_trace_t *); s = format (s, "NAT44_OUT2IN: sw_if_index %d, next index %d, session index %d", t->sw_if_index, t->next_index, t->session_index); return s; } static u8 * format_nat44_ei_out2in_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_out2in_trace_t *t = va_arg (*args, nat44_ei_out2in_trace_t *); s = format (s, "NAT44_OUT2IN_FAST: sw_if_index %d, next index %d", t->sw_if_index, t->next_index); return s; } #define foreach_nat44_ei_out2in_error \ _ (UNSUPPORTED_PROTOCOL, "unsupported protocol") \ _ (OUT_OF_PORTS, "out of ports") \ _ (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) NAT44_EI_OUT2IN_ERROR_##sym, foreach_nat44_ei_out2in_error #undef _ NAT44_EI_OUT2IN_N_ERROR, } nat44_ei_out2in_error_t; static char *nat44_ei_out2in_error_strings[] = { #define _(sym,string) string, foreach_nat44_ei_out2in_error #undef _ }; typedef enum { NAT44_EI_OUT2IN_NEXT_DROP, NAT44_EI_OUT2IN_NEXT_LOOKUP, NAT44_EI_OUT2IN_NEXT_ICMP_ERROR, NAT44_EI_OUT2IN_N_NEXT, } nat44_ei_out2in_next_t; #ifndef CLIB_MARCH_VARIANT int nat44_o2i_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_i2o_k (&s_kv, s); if (clib_bihash_add_del_8_8 (&nm->in2out, &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 /** * @brief Create session for static mapping. * * Create NAT session initiated by host from external network with static * mapping. * * @param nm NAT main. * @param b0 Vlib buffer. * @param in2out In2out NAT44 session key. * @param out2in Out2in NAT44 session key. * @param node Vlib node. * * @returns NAT44_EI session if successfully created otherwise 0. */ static inline nat44_ei_session_t * create_session_for_static_mapping ( nat44_ei_main_t *nm, vlib_buffer_t *b0, ip4_address_t i2o_addr, u16 i2o_port, u32 i2o_fib_index, ip4_address_t o2i_addr, u16 o2i_port, u32 o2i_fib_index, nat_protocol_t proto, vlib_node_runtime_t *node, u32 thread_index, f64 now) { nat44_ei_user_t *u; nat44_ei_session_t *s; clib_bihash_kv_8_8_t kv0; ip4_header_t *ip0; udp_header_t *udp0; nat44_ei_is_idle_session_ctx_t ctx0; if (PREDICT_FALSE (nat44_ei_maximum_sessions_exceeded (nm, thread_index))) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED]; nat_elog_notice (nm, "maximum sessions exceeded"); return 0; } ip0 = vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); u = nat44_ei_user_get_or_create (nm, &i2o_addr, i2o_fib_index, thread_index); if (!u) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_CANNOT_CREATE_USER]; return 0; } 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 0; } s->flags |= NAT44_EI_SESSION_FLAG_STATIC_MAPPING; s->ext_host_addr.as_u32 = ip0->src_address.as_u32; s->ext_host_port = udp0->src_port; nat44_ei_user_session_increment (nm, u, 1 /* static */); s->in2out.addr = i2o_addr; s->in2out.port = i2o_port; s->in2out.fib_index = i2o_fib_index; s->out2in.addr = o2i_addr; s->out2in.port = o2i_port; s->out2in.fib_index = o2i_fib_index; s->nat_proto = proto; /* 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 s; } #ifndef CLIB_MARCH_VARIANT static_always_inline nat44_ei_out2in_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; 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->dst_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->src_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)->src_port; break; default: return NAT44_EI_OUT2IN_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] nm 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 nat44_ei_icmp_match_out2in_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; u8 is_addr_only; u32 next0 = ~0; int err; u8 identity_nat; 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); *proto = 0; err = icmp_get_key (b0, ip0, addr, port, proto); if (err != -1) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } ip4_address_t mapping_addr; u16 mapping_port; u32 mapping_fib_index; init_nat_k (&kv0, *addr, *port, *fib_index, *proto); if (clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (nat44_ei_static_mapping_match ( *addr, *port, *fib_index, *proto, &mapping_addr, &mapping_port, &mapping_fib_index, 1, &is_addr_only, &identity_nat)) { if (!nm->forwarding_enabled) { /* 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))) { *dont_translate = 1; goto out; } b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_NO_TRANSLATION]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } else { *dont_translate = 1; goto out; } } if (PREDICT_FALSE (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request || !is_addr_only))) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } if (PREDICT_FALSE (identity_nat)) { *dont_translate = 1; goto out; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping ( nm, b0, mapping_addr, mapping_port, mapping_fib_index, *addr, *port, *fib_index, *proto, node, thread_index, vlib_time_now (vm)); if (!s0) { next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } } else { if (PREDICT_FALSE (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply && vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request && !icmp_type_is_error_message (vnet_buffer (b0)->ip. reass.icmp_type_or_tcp_flags))) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } s0 = pool_elt_at_index (tnm->sessions, nat_value_get_session_index (&value0)); } out: if (s0) { *addr = s0->in2out.addr; *port = s0->in2out.port; *fib_index = s0->in2out.fib_index; } if (p_s0) *p_s0 = s0; return next0; } #endif #ifndef CLIB_MARCH_VARIANT u32 nat44_ei_icmp_match_out2in_fast (vlib_node_runtime_t *node, u32 thread_index, vlib_buffer_t *b0, ip4_header_t *ip0, ip4_address_t *mapping_addr, u16 *mapping_port, u32 *mapping_fib_index, nat_protocol_t *proto, nat44_ei_session_t **p_s0, u8 *dont_translate) { nat44_ei_main_t *nm = &nat44_ei_main; u32 sw_if_index0; u32 rx_fib_index0; u8 is_addr_only; u32 next0 = ~0; int err; ip4_address_t addr; u16 port; *dont_translate = 0; sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); err = icmp_get_key (b0, ip0, &addr, &port, proto); if (err != -1) { b0->error = node->errors[err]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } if (nat44_ei_static_mapping_match (addr, port, rx_fib_index0, *proto, mapping_addr, mapping_port, mapping_fib_index, 1, &is_addr_only, 0)) { /* Don't NAT packet aimed at the intfc address */ if (nat44_ei_is_interface_addr (nm->ip4_main, node, sw_if_index0, ip0->dst_address.as_u32)) { *dont_translate = 1; goto out; } b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_NO_TRANSLATION]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } if (PREDICT_FALSE (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_reply && (vnet_buffer (b0)->ip.reass.icmp_type_or_tcp_flags != ICMP4_echo_request || !is_addr_only) && !icmp_type_is_error_message (vnet_buffer (b0)->ip. reass.icmp_type_or_tcp_flags))) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } out: return next0; } #endif u32 nat44_ei_icmp_out2in (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); #ifndef CLIB_MARCH_VARIANT u32 nat44_ei_icmp_out2in (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; icmp_echo_header_t *echo0, *inner_echo0 = 0; ip4_header_t *inner_ip0 = 0; void *l4_header = 0; icmp46_header_t *inner_icmp0; u8 dont_translate; u32 new_addr0, old_addr0; u16 old_id0, new_id0; ip_csum_t sum0; u16 checksum0; u32 next0_tmp; vlib_main_t *vm = vlib_get_main (); ip4_address_t addr; u16 port; u32 fib_index; nat_protocol_t proto; echo0 = (icmp_echo_header_t *) (icmp0 + 1); if (PREDICT_TRUE (nm->pat)) { next0_tmp = nat44_ei_icmp_match_out2in_slow ( node, thread_index, b0, ip0, &addr, &port, &fib_index, &proto, p_s0, &dont_translate); } else { next0_tmp = nat44_ei_icmp_match_out2in_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_OUT2IN_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 (checksum0 != 0 && checksum0 != 0xffff) { next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto out; } } old_addr0 = ip0->dst_address.as_u32; new_addr0 = ip0->dst_address.as_u32 = addr.as_u32; vnet_buffer (b0)->sw_if_index[VLIB_TX] = fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_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 /* changed member */ ); 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_OUT2IN_NEXT_DROP; goto out; } old_addr0 = inner_ip0->src_address.as_u32; inner_ip0->src_address = addr; 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 /* changed member */ ); 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)->src_port; new_id0 = port; ((tcp_udp_header_t *) l4_header)->src_port = new_id0; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_id0, new_id0, tcp_udp_header_t, src_port); icmp0->checksum = ip_csum_fold (sum0); break; default: ASSERT (0); } } } out: return next0; } #endif static inline u32 nat44_ei_icmp_out2in_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_out2in (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_OUT2IN_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 int nat_out2in_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->dst_address, 0, 0, 0); if (clib_bihash_search_8_8 (&nm->static_mapping_by_external, &kv, &value)) return 1; 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); vnet_buffer (b)->sw_if_index[VLIB_TX] = m->fib_index; return 0; } VLIB_NODE_FN (nat44_ei_out2in_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { 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; nat44_ei_main_per_thread_data_t *tnm = &nm->per_thread_data[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 = NAT44_EI_OUT2IN_NEXT_LOOKUP; u32 next1 = NAT44_EI_OUT2IN_NEXT_LOOKUP; u32 sw_if_index0, sw_if_index1; ip4_header_t *ip0, *ip1; ip_csum_t sum0, sum1; u32 new_addr0, old_addr0; u16 new_port0, old_port0; u32 new_addr1, old_addr1; u16 new_port1, old_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, kv1, value0, value1; u8 identity_nat0, identity_nat1; ip4_address_t sm_addr0, sm_addr1; u16 sm_port0, sm_port1; u32 sm_fib_index0, sm_fib_index1; 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); } vnet_buffer (b0)->snat.flags = 0; vnet_buffer (b1)->snat.flags = 0; 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 = vec_elt (nm->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 = NAT44_EI_OUT2IN_NEXT_ICMP_ERROR; goto trace0; } proto0 = ip_proto_to_nat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { if (nat_out2in_sm_unknown_proto (nm, b0, ip0, rx_fib_index0)) { if (!nm->forwarding_enabled) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; } } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.other, thread_index, sw_if_index0, 1); goto trace0; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = nat44_ei_icmp_out2in_slow_path ( nm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); vlib_increment_simple_counter (&nm->counters.slowpath.out2in.icmp, thread_index, sw_if_index0, 1); goto trace0; } init_nat_k (&kv0, ip0->dst_address, vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, proto0); if (clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (nat44_ei_static_mapping_match ( ip0->dst_address, vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, proto0, &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, &identity_nat0)) { /* * 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_client)))) { vnet_feature_next (&next0, b0); goto trace0; } if (!nm->forwarding_enabled) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_NO_TRANSLATION]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; } goto trace0; } if (PREDICT_FALSE (identity_nat0)) goto trace0; /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping ( nm, b0, sm_addr0, sm_port0, sm_fib_index0, ip0->dst_address, vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, proto0, node, thread_index, now); if (!s0) { next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto trace0; } } else s0 = pool_elt_at_index (tnm->sessions, nat_value_get_session_index (&value0)); old_addr0 = ip0->dst_address.as_u32; ip0->dst_address = s0->in2out.addr; new_addr0 = ip0->dst_address.as_u32; vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_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_dst_port; new_port0 = udp0->dst_port = s0->in2out.port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); tcp0->checksum = ip_csum_fold (sum0); } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.tcp, thread_index, sw_if_index0, 1); } else { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; new_port0 = udp0->dst_port = s0->in2out.port; if (PREDICT_FALSE (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); } } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.udp, thread_index, 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_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = 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_OUT2IN_NEXT_DROP) { vlib_increment_simple_counter (&nm->counters.slowpath.out2in.drops, thread_index, sw_if_index0, 1); } ip1 = vlib_buffer_get_current (b1); 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 (nm->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 = NAT44_EI_OUT2IN_NEXT_ICMP_ERROR; goto trace1; } proto1 = ip_proto_to_nat_proto (ip1->protocol); if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_OTHER)) { if (nat_out2in_sm_unknown_proto (nm, b1, ip1, rx_fib_index1)) { if (!nm->forwarding_enabled) { b1->error = node->errors[NAT44_EI_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next1 = NAT44_EI_OUT2IN_NEXT_DROP; } } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.other, thread_index, sw_if_index1, 1); goto trace1; } if (PREDICT_FALSE (proto1 == NAT_PROTOCOL_ICMP)) { next1 = nat44_ei_icmp_out2in_slow_path ( nm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, next1, now, thread_index, &s1); vlib_increment_simple_counter (&nm->counters.slowpath.out2in.icmp, thread_index, sw_if_index1, 1); goto trace1; } init_nat_k (&kv1, ip1->dst_address, vnet_buffer (b1)->ip.reass.l4_dst_port, rx_fib_index1, proto1); if (clib_bihash_search_8_8 (&nm->out2in, &kv1, &value1)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (nat44_ei_static_mapping_match ( ip1->dst_address, vnet_buffer (b1)->ip.reass.l4_dst_port, rx_fib_index1, proto1, &sm_addr1, &sm_port1, &sm_fib_index1, 1, 0, &identity_nat1)) { /* * 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_client)))) { vnet_feature_next (&next1, b1); goto trace1; } if (!nm->forwarding_enabled) { b1->error = node->errors[NAT44_EI_OUT2IN_ERROR_NO_TRANSLATION]; next1 = NAT44_EI_OUT2IN_NEXT_DROP; } goto trace1; } if (PREDICT_FALSE (identity_nat1)) goto trace1; /* Create session initiated by host from external network */ s1 = create_session_for_static_mapping ( nm, b1, sm_addr1, sm_port1, sm_fib_index1, ip1->dst_address, vnet_buffer (b1)->ip.reass.l4_dst_port, rx_fib_index1, proto1, node, thread_index, now); if (!s1) { next1 = NAT44_EI_OUT2IN_NEXT_DROP; goto trace1; } } else s1 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions, nat_value_get_session_index (&value1)); old_addr1 = ip1->dst_address.as_u32; ip1->dst_address = s1->in2out.addr; new_addr1 = ip1->dst_address.as_u32; vnet_buffer (b1)->sw_if_index[VLIB_TX] = s1->in2out.fib_index; sum1 = ip1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_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_dst_port; new_port1 = udp1->dst_port = s1->in2out.port; sum1 = tcp1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */ ); sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t /* cheat */ , length /* changed member */ ); tcp1->checksum = ip_csum_fold (sum1); } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.tcp, thread_index, sw_if_index1, 1); } else { if (!vnet_buffer (b1)->ip.reass.is_non_first_fragment) { old_port1 = vnet_buffer (b1)->ip.reass.l4_dst_port; new_port1 = udp1->dst_port = s1->in2out.port; if (PREDICT_FALSE (udp1->checksum)) { 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 (&nm->counters.slowpath.out2in.udp, thread_index, 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); trace1: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_out2in_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 - nm->per_thread_data[thread_index].sessions; } if (next1 == NAT44_EI_OUT2IN_NEXT_DROP) { vlib_increment_simple_counter (&nm->counters.slowpath.out2in.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 = NAT44_EI_OUT2IN_NEXT_LOOKUP; u32 sw_if_index0; ip4_header_t *ip0; ip_csum_t sum0; u32 new_addr0, old_addr0; u16 new_port0, old_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; u8 identity_nat0; ip4_address_t sm_addr0; u16 sm_port0; u32 sm_fib_index0; b0 = *b; ++b; vnet_buffer (b0)->snat.flags = 0; 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 = vec_elt (nm->ip4_main->fib_index_by_sw_if_index, sw_if_index0); proto0 = ip_proto_to_nat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) { if (nat_out2in_sm_unknown_proto (nm, b0, ip0, rx_fib_index0)) { if (!nm->forwarding_enabled) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; } } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.other, thread_index, sw_if_index0, 1); goto trace00; } 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 = NAT44_EI_OUT2IN_NEXT_ICMP_ERROR; goto trace00; } if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = nat44_ei_icmp_out2in_slow_path ( nm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); vlib_increment_simple_counter (&nm->counters.slowpath.out2in.icmp, thread_index, sw_if_index0, 1); goto trace00; } init_nat_k (&kv0, ip0->dst_address, vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, proto0); if (clib_bihash_search_8_8 (&nm->out2in, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (nat44_ei_static_mapping_match ( ip0->dst_address, vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, proto0, &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, &identity_nat0)) { /* * 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_client)))) { vnet_feature_next (&next0, b0); goto trace00; } if (!nm->forwarding_enabled) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_NO_TRANSLATION]; next0 = NAT44_EI_OUT2IN_NEXT_DROP; } goto trace00; } if (PREDICT_FALSE (identity_nat0)) goto trace00; /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping ( nm, b0, sm_addr0, sm_port0, sm_fib_index0, ip0->dst_address, vnet_buffer (b0)->ip.reass.l4_dst_port, rx_fib_index0, proto0, node, thread_index, now); if (!s0) { next0 = NAT44_EI_OUT2IN_NEXT_DROP; goto trace00; } } else s0 = pool_elt_at_index (nm->per_thread_data[thread_index].sessions, nat_value_get_session_index (&value0)); old_addr0 = ip0->dst_address.as_u32; ip0->dst_address = s0->in2out.addr; new_addr0 = ip0->dst_address.as_u32; vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_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_dst_port; new_port0 = udp0->dst_port = s0->in2out.port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); tcp0->checksum = ip_csum_fold (sum0); } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.tcp, thread_index, sw_if_index0, 1); } else { if (!vnet_buffer (b0)->ip.reass.is_non_first_fragment) { old_port0 = vnet_buffer (b0)->ip.reass.l4_dst_port; new_port0 = udp0->dst_port = s0->in2out.port; if (PREDICT_FALSE (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); } } vlib_increment_simple_counter (&nm->counters.slowpath.out2in.udp, thread_index, 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_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = 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_OUT2IN_NEXT_DROP) { vlib_increment_simple_counter (&nm->counters.slowpath.out2in.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; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ei_out2in_node) = { .name = "nat44-ei-out2in", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_out2in_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_out2in_error_strings), .error_strings = nat44_ei_out2in_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_OUT2IN_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [NAT44_EI_OUT2IN_NEXT_DROP] = "error-drop", [NAT44_EI_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [NAT44_EI_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (nat44_ei_out2in_fast_node) (vlib_main_t *vm, vlib_node_runtime_t *node, vlib_frame_t *frame) { u32 n_left_from, *from; nat44_ei_main_t *nm = &nat44_ei_main; 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 > 0) { vlib_buffer_t *b0; u32 next0 = NAT44_EI_OUT2IN_NEXT_DROP; u32 sw_if_index0; ip4_header_t *ip0; ip_csum_t sum0; u32 new_addr0, old_addr0; u16 new_port0, old_port0; udp_header_t *udp0; tcp_header_t *tcp0; icmp46_header_t *icmp0; u32 proto0; u32 rx_fib_index0; ip4_address_t sm_addr0; u16 sm_port0; u32 sm_fib_index0; b0 = *b; b++; 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); vnet_feature_next (&next0, b0); 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 = NAT44_EI_OUT2IN_NEXT_ICMP_ERROR; goto trace00; } proto0 = ip_proto_to_nat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_OTHER)) goto trace00; if (PREDICT_FALSE (proto0 == NAT_PROTOCOL_ICMP)) { next0 = nat44_ei_icmp_out2in (b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, ~0, 0); goto trace00; } if (nat44_ei_static_mapping_match (ip0->dst_address, udp0->dst_port, rx_fib_index0, proto0, &sm_addr0, &sm_port0, &sm_fib_index0, 1, 0, 0)) { b0->error = node->errors[NAT44_EI_OUT2IN_ERROR_NO_TRANSLATION]; goto trace00; } new_addr0 = sm_addr0.as_u32; new_port0 = sm_port0; vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm_fib_index0; old_addr0 = ip0->dst_address.as_u32; ip0->dst_address.as_u32 = new_addr0; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_FALSE (new_port0 != udp0->dst_port)) { old_port0 = udp0->dst_port; udp0->dst_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 */ ); 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 */ ); 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); } } trace00: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ei_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } if (next0 == NAT44_EI_OUT2IN_NEXT_DROP) { vlib_increment_simple_counter (&nm->counters.fastpath.out2in.drops, vm->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; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ei_out2in_fast_node) = { .name = "nat44-ei-out2in-fast", .vector_size = sizeof (u32), .format_trace = format_nat44_ei_out2in_fast_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat44_ei_out2in_error_strings), .error_strings = nat44_ei_out2in_error_strings, .runtime_data_bytes = sizeof (nat44_ei_runtime_t), .n_next_nodes = NAT44_EI_OUT2IN_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [NAT44_EI_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [NAT44_EI_OUT2IN_NEXT_DROP] = "error-drop", [NAT44_EI_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */