/* * 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 endpoint-dependent outside to inside network translation */ #include <vlib/vlib.h> #include <vnet/vnet.h> #include <vnet/pg/pg.h> #include <vnet/ip/ip.h> #include <vnet/udp/udp.h> #include <vnet/ethernet/ethernet.h> #include <vnet/fib/ip4_fib.h> #include <nat/nat.h> #include <nat/nat_ipfix_logging.h> #include <nat/nat_reass.h> #include <nat/nat_inlines.h> #include <vppinfra/hash.h> #include <vppinfra/error.h> #include <vppinfra/elog.h> typedef struct { u32 sw_if_index; u32 next_index; u32 session_index; } snat_out2in_trace_t; /* packet trace format function */ static u8 * format_snat_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 *); snat_out2in_trace_t *t = va_arg (*args, snat_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_snat_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 *); snat_out2in_trace_t *t = va_arg (*args, snat_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; } vlib_node_registration_t snat_out2in_node; vlib_node_registration_t snat_out2in_fast_node; vlib_node_registration_t nat44_out2in_reass_node; #define foreach_snat_out2in_error \ _(UNSUPPORTED_PROTOCOL, "Unsupported protocol") \ _(OUT2IN_PACKETS, "Good out2in packets processed") \ _(OUT_OF_PORTS, "Out of ports") \ _(BAD_ICMP_TYPE, "unsupported ICMP type") \ _(NO_TRANSLATION, "No translation") \ _(MAX_SESSIONS_EXCEEDED, "Maximum sessions exceeded") \ _(DROP_FRAGMENT, "Drop fragment") \ _(MAX_REASS, "Maximum reassemblies exceeded") \ _(MAX_FRAG, "Maximum fragments per reassembly exceeded") typedef enum { #define _(sym,str) SNAT_OUT2IN_ERROR_##sym, foreach_snat_out2in_error #undef _ SNAT_OUT2IN_N_ERROR, } snat_out2in_error_t; static char *snat_out2in_error_strings[] = { #define _(sym,string) string, foreach_snat_out2in_error #undef _ }; typedef enum { SNAT_OUT2IN_NEXT_DROP, SNAT_OUT2IN_NEXT_LOOKUP, SNAT_OUT2IN_NEXT_ICMP_ERROR, SNAT_OUT2IN_NEXT_REASS, SNAT_OUT2IN_N_NEXT, } snat_out2in_next_t; int nat44_o2i_is_idle_session_cb (clib_bihash_kv_8_8_t * kv, void *arg) { snat_main_t *sm = &snat_main; nat44_is_idle_session_ctx_t *ctx = arg; snat_session_t *s; u64 sess_timeout_time; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, ctx->thread_index); clib_bihash_kv_8_8_t s_kv; s = pool_elt_at_index (tsm->sessions, kv->value); sess_timeout_time = s->last_heard + (f64) nat44_session_get_timeout (sm, s); if (ctx->now >= sess_timeout_time) { s_kv.key = s->in2out.as_u64; if (clib_bihash_add_del_8_8 (&tsm->in2out, &s_kv, 0)) nat_log_warn ("out2in key del failed"); snat_ipfix_logging_nat44_ses_delete (s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->in2out.protocol, s->in2out.port, s->out2in.port, s->in2out.fib_index); if (!snat_is_session_static (s)) snat_free_outside_address_and_port (sm->addresses, ctx->thread_index, &s->out2in); nat44_delete_session (sm, s, ctx->thread_index); return 1; } return 0; } /** * @brief Create session for static mapping. * * Create NAT session initiated by host from external network with static * mapping. * * @param sm NAT main. * @param b0 Vlib buffer. * @param in2out In2out NAT44 session key. * @param out2in Out2in NAT44 session key. * @param node Vlib node. * * @returns SNAT session if successfully created otherwise 0. */ static inline snat_session_t * create_session_for_static_mapping (snat_main_t * sm, vlib_buffer_t * b0, snat_session_key_t in2out, snat_session_key_t out2in, vlib_node_runtime_t * node, u32 thread_index, f64 now) { snat_user_t *u; snat_session_t *s; clib_bihash_kv_8_8_t kv0; ip4_header_t *ip0; udp_header_t *udp0; nat44_is_idle_session_ctx_t ctx0; if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) { b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_SESSIONS_EXCEEDED]; nat_log_notice ("maximum sessions exceeded"); return 0; } ip0 = vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); u = nat_user_get_or_create (sm, &in2out.addr, in2out.fib_index, thread_index); if (!u) { nat_log_warn ("create NAT user failed"); return 0; } s = nat_session_alloc_or_recycle (sm, u, thread_index); if (!s) { nat44_delete_user_with_no_session (sm, u, thread_index); nat_log_warn ("create NAT session failed"); return 0; } s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; s->ext_host_addr.as_u32 = ip0->src_address.as_u32; s->ext_host_port = udp0->src_port; user_session_increment (sm, u, 1 /* static */ ); s->in2out = in2out; s->out2in = out2in; s->in2out.protocol = out2in.protocol; /* Add to translation hashes */ ctx0.now = now; ctx0.thread_index = thread_index; kv0.key = s->in2out.as_u64; kv0.value = s - sm->per_thread_data[thread_index].sessions; if (clib_bihash_add_or_overwrite_stale_8_8 (&sm->per_thread_data[thread_index].in2out, &kv0, nat44_i2o_is_idle_session_cb, &ctx0)) nat_log_notice ("in2out key add failed"); kv0.key = s->out2in.as_u64; if (clib_bihash_add_or_overwrite_stale_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, nat44_o2i_is_idle_session_cb, &ctx0)) nat_log_notice ("out2in key add failed"); /* log NAT event */ snat_ipfix_logging_nat44_ses_create (s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->in2out.protocol, s->in2out.port, s->out2in.port, s->in2out.fib_index); return s; } static_always_inline snat_out2in_error_t icmp_get_key (ip4_header_t * ip0, snat_session_key_t * p_key0) { icmp46_header_t *icmp0; snat_session_key_t key0; icmp_echo_header_t *echo0, *inner_echo0 = 0; ip4_header_t *inner_ip0; void *l4_header = 0; icmp46_header_t *inner_icmp0; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); echo0 = (icmp_echo_header_t *) (icmp0 + 1); if (!icmp_is_error_message (icmp0)) { key0.protocol = SNAT_PROTOCOL_ICMP; key0.addr = ip0->dst_address; key0.port = echo0->identifier; } else { inner_ip0 = (ip4_header_t *) (echo0 + 1); l4_header = ip4_next_header (inner_ip0); key0.protocol = ip_proto_to_snat_proto (inner_ip0->protocol); key0.addr = inner_ip0->src_address; switch (key0.protocol) { case SNAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t *) l4_header; inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); key0.port = inner_echo0->identifier; break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: key0.port = ((tcp_udp_header_t *) l4_header)->src_port; break; default: return SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL; } } *p_key0 = key0; return -1; /* success */ } /** * Get address and port values to be used for ICMP packet translation * and create session if needed * * @param[in,out] sm NAT main * @param[in,out] node NAT node runtime * @param[in] thread_index thread index * @param[in,out] b0 buffer containing packet to be translated * @param[out] p_proto protocol used for matching * @param[out] p_value address and port after NAT translation * @param[out] p_dont_translate if packet should not be translated * @param d optional parameter * @param e optional parameter */ u32 icmp_match_out2in_slow (snat_main_t * sm, vlib_node_runtime_t * node, u32 thread_index, vlib_buffer_t * b0, ip4_header_t * ip0, u8 * p_proto, snat_session_key_t * p_value, u8 * p_dont_translate, void *d, void *e) { icmp46_header_t *icmp0; u32 sw_if_index0; u32 rx_fib_index0; snat_session_key_t key0; snat_session_key_t sm0; snat_session_t *s0 = 0; u8 dont_translate = 0; clib_bihash_kv_8_8_t kv0, value0; u8 is_addr_only; u32 next0 = ~0; int err; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); key0.protocol = 0; err = icmp_get_key (ip0, &key0); if (err != -1) { b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (snat_static_mapping_match (sm, key0, &sm0, 1, &is_addr_only, 0, 0, 0)) { if (!sm->forwarding_enabled) { /* Don't NAT packet aimed at the intfc address */ if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32))) { dont_translate = 1; goto out; } b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } else { dont_translate = 1; goto out; } } if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply && (icmp0->type != ICMP4_echo_request || !is_addr_only))) { b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node, thread_index, vlib_time_now (sm->vlib_main)); if (!s0) { next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } } else { if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply && icmp0->type != ICMP4_echo_request && !icmp_is_error_message (icmp0))) { b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, value0.value); } out: *p_proto = key0.protocol; if (s0) *p_value = s0->in2out; *p_dont_translate = dont_translate; if (d) *(snat_session_t **) d = s0; return next0; } /** * Get address and port values to be used for ICMP packet translation * * @param[in] sm NAT main * @param[in,out] node NAT node runtime * @param[in] thread_index thread index * @param[in,out] b0 buffer containing packet to be translated * @param[out] p_proto protocol used for matching * @param[out] p_value address and port after NAT translation * @param[out] p_dont_translate if packet should not be translated * @param d optional parameter * @param e optional parameter */ u32 icmp_match_out2in_fast (snat_main_t * sm, vlib_node_runtime_t * node, u32 thread_index, vlib_buffer_t * b0, ip4_header_t * ip0, u8 * p_proto, snat_session_key_t * p_value, u8 * p_dont_translate, void *d, void *e) { icmp46_header_t *icmp0; u32 sw_if_index0; u32 rx_fib_index0; snat_session_key_t key0; snat_session_key_t sm0; u8 dont_translate = 0; u8 is_addr_only; u32 next0 = ~0; int err; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index (sw_if_index0); err = icmp_get_key (ip0, &key0); if (err != -1) { b0->error = node->errors[err]; next0 = SNAT_OUT2IN_NEXT_DROP; goto out2; } key0.fib_index = rx_fib_index0; if (snat_static_mapping_match (sm, key0, &sm0, 1, &is_addr_only, 0, 0, 0)) { /* Don't NAT packet aimed at the intfc address */ if (is_interface_addr (sm, node, sw_if_index0, ip0->dst_address.as_u32)) { dont_translate = 1; goto out; } b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } if (PREDICT_FALSE (icmp0->type != ICMP4_echo_reply && (icmp0->type != ICMP4_echo_request || !is_addr_only) && !icmp_is_error_message (icmp0))) { b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE]; next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } out: *p_value = sm0; out2: *p_proto = key0.protocol; *p_dont_translate = dont_translate; return next0; } u32 icmp_out2in (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0, icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0, vlib_node_runtime_t * node, u32 next0, u32 thread_index, void *d, void *e) { snat_session_key_t sm0; u8 protocol; icmp_echo_header_t *echo0, *inner_echo0 = 0; ip4_header_t *inner_ip0 = 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; echo0 = (icmp_echo_header_t *) (icmp0 + 1); next0_tmp = sm->icmp_match_out2in_cb (sm, node, thread_index, b0, ip0, &protocol, &sm0, &dont_translate, d, e); if (next0_tmp != ~0) next0 = next0_tmp; if (next0 == SNAT_OUT2IN_NEXT_DROP || dont_translate) goto out; if (PREDICT_TRUE (!ip4_is_fragment (ip0))) { sum0 = ip_incremental_checksum (0, icmp0, ntohs (ip0->length) - ip4_header_bytes (ip0)); checksum0 = ~ip_csum_fold (sum0); if (checksum0 != 0 && checksum0 != 0xffff) { next0 = SNAT_OUT2IN_NEXT_DROP; goto out; } } old_addr0 = ip0->dst_address.as_u32; new_addr0 = ip0->dst_address.as_u32 = sm0.addr.as_u32; vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index; sum0 = ip0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); ip0->checksum = ip_csum_fold (sum0); if (icmp0->checksum == 0) icmp0->checksum = 0xffff; if (!icmp_is_error_message (icmp0)) { new_id0 = sm0.port; if (PREDICT_FALSE (new_id0 != echo0->identifier)) { old_id0 = echo0->identifier; new_id0 = sm0.port; echo0->identifier = new_id0; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, identifier /* 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 = SNAT_OUT2IN_NEXT_DROP; goto out; } old_addr0 = inner_ip0->src_address.as_u32; inner_ip0->src_address = sm0.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 (protocol) { case SNAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t *) l4_header; inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); old_id0 = inner_echo0->identifier; new_id0 = sm0.port; inner_echo0->identifier = new_id0; sum0 = icmp0->checksum; sum0 = ip_csum_update (sum0, old_id0, new_id0, icmp_echo_header_t, identifier); icmp0->checksum = ip_csum_fold (sum0); break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: old_id0 = ((tcp_udp_header_t *) l4_header)->src_port; new_id0 = sm0.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; } static inline u32 icmp_out2in_slow_path (snat_main_t * sm, vlib_buffer_t * b0, ip4_header_t * ip0, icmp46_header_t * icmp0, u32 sw_if_index0, u32 rx_fib_index0, vlib_node_runtime_t * node, u32 next0, f64 now, u32 thread_index, snat_session_t ** p_s0) { next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, thread_index, p_s0, 0); snat_session_t *s0 = *p_s0; if (PREDICT_TRUE (next0 != SNAT_OUT2IN_NEXT_DROP && s0)) { /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (sm->vlib_main, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); } return next0; } static int nat_out2in_sm_unknown_proto (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip, u32 rx_fib_index) { clib_bihash_kv_8_8_t kv, value; snat_static_mapping_t *m; snat_session_key_t m_key; u32 old_addr, new_addr; ip_csum_t sum; m_key.addr = ip->dst_address; m_key.port = 0; m_key.protocol = 0; m_key.fib_index = 0; kv.key = m_key.as_u64; if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) return 1; m = pool_elt_at_index (sm->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; } static uword snat_out2in_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; snat_out2in_next_t next_index; u32 pkts_processed = 0; snat_main_t *sm = &snat_main; f64 now = vlib_time_now (vm); u32 thread_index = vm->thread_index; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0 = SNAT_OUT2IN_NEXT_LOOKUP; u32 next1 = SNAT_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; snat_session_key_t key0, key1, sm0, sm1; u32 rx_fib_index0, rx_fib_index1; u32 proto0, proto1; snat_session_t *s0 = 0, *s1 = 0; clib_bihash_kv_8_8_t kv0, kv1, value0, value1; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; from += 2; to_next += 2; n_left_from -= 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); 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 (sm->ip4_main->fib_index_by_sw_if_index, sw_if_index0); if (PREDICT_FALSE (ip0->ttl == 1)) { vnet_buffer (b0)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b0, ICMP4_time_exceeded, ICMP4_time_exceeded_ttl_exceeded_in_transit, 0); next0 = SNAT_OUT2IN_NEXT_ICMP_ERROR; goto trace0; } proto0 = ip_proto_to_snat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == ~0)) { if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0)) { if (!sm->forwarding_enabled) { b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next0 = SNAT_OUT2IN_NEXT_DROP; } } goto trace0; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); goto trace0; } if (PREDICT_FALSE (ip4_is_fragment (ip0))) { next0 = SNAT_OUT2IN_NEXT_REASS; goto trace0; } key0.addr = ip0->dst_address; key0.port = udp0->dst_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0)) { /* * 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 == SNAT_PROTOCOL_UDP && (udp0->dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next0, b0); goto trace0; } if (!sm->forwarding_enabled) { b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; next0 = SNAT_OUT2IN_NEXT_DROP; } goto trace0; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node, thread_index, now); if (!s0) { next0 = SNAT_OUT2IN_NEXT_DROP; goto trace0; } } else s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, value0.value); 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 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->dst_port; tcp0->dst_port = s0->in2out.port; new_port0 = tcp0->dst_port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); tcp0->checksum = ip_csum_fold (sum0); } else { old_port0 = udp0->dst_port; udp0->dst_port = s0->in2out.port; udp0->checksum = 0; } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_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 - sm->per_thread_data[thread_index].sessions; } pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP; 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 (sm->ip4_main->fib_index_by_sw_if_index, sw_if_index1); if (PREDICT_FALSE (ip1->ttl == 1)) { vnet_buffer (b1)->sw_if_index[VLIB_TX] = (u32) ~ 0; icmp4_error_set_vnet_buffer (b1, ICMP4_time_exceeded, ICMP4_time_exceeded_ttl_exceeded_in_transit, 0); next1 = SNAT_OUT2IN_NEXT_ICMP_ERROR; goto trace1; } proto1 = ip_proto_to_snat_proto (ip1->protocol); if (PREDICT_FALSE (proto1 == ~0)) { if (nat_out2in_sm_unknown_proto (sm, b1, ip1, rx_fib_index1)) { if (!sm->forwarding_enabled) { b1->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next1 = SNAT_OUT2IN_NEXT_DROP; } } goto trace1; } if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) { next1 = icmp_out2in_slow_path (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, next1, now, thread_index, &s1); goto trace1; } if (PREDICT_FALSE (ip4_is_fragment (ip1))) { next1 = SNAT_OUT2IN_NEXT_REASS; goto trace1; } key1.addr = ip1->dst_address; key1.port = udp1->dst_port; key1.protocol = proto1; key1.fib_index = rx_fib_index1; kv1.key = key1.as_u64; if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv1, &value1)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (snat_static_mapping_match (sm, key1, &sm1, 1, 0, 0, 0, 0)) { /* * 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 == SNAT_PROTOCOL_UDP && (udp1->dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next1, b1); goto trace1; } if (!sm->forwarding_enabled) { b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; next1 = SNAT_OUT2IN_NEXT_DROP; } goto trace1; } /* Create session initiated by host from external network */ s1 = create_session_for_static_mapping (sm, b1, sm1, key1, node, thread_index, now); if (!s1) { next1 = SNAT_OUT2IN_NEXT_DROP; goto trace1; } } else s1 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, value1.value); 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 == SNAT_PROTOCOL_TCP)) { old_port1 = tcp1->dst_port; tcp1->dst_port = s1->in2out.port; new_port1 = tcp1->dst_port; sum1 = tcp1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address /* changed member */ ); sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t /* cheat */ , length /* changed member */ ); tcp1->checksum = ip_csum_fold (sum1); } else { old_port1 = udp1->dst_port; udp1->dst_port = s1->in2out.port; udp1->checksum = 0; } /* Accounting */ nat44_session_update_counters (s1, now, vlib_buffer_length_in_chain (vm, b1)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s1, thread_index); trace1: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { snat_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 - sm->per_thread_data[thread_index].sessions; } pkts_processed += next1 != SNAT_OUT2IN_NEXT_DROP; /* verify speculative enqueues, maybe switch current next frame */ vlib_validate_buffer_enqueue_x2 (vm, node, next_index, to_next, n_left_to_next, bi0, bi1, next0, next1); } while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0 = SNAT_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; snat_session_key_t key0, sm0; u32 rx_fib_index0; u32 proto0; snat_session_t *s0 = 0; clib_bihash_kv_8_8_t kv0, value0; /* speculatively enqueue b0 to the current next frame */ bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); 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 (sm->ip4_main->fib_index_by_sw_if_index, sw_if_index0); proto0 = ip_proto_to_snat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == ~0)) { if (nat_out2in_sm_unknown_proto (sm, b0, ip0, rx_fib_index0)) { if (!sm->forwarding_enabled) { b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL]; next0 = SNAT_OUT2IN_NEXT_DROP; } } 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 = SNAT_OUT2IN_NEXT_ICMP_ERROR; goto trace00; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); goto trace00; } if (PREDICT_FALSE (ip4_is_fragment (ip0))) { next0 = SNAT_OUT2IN_NEXT_REASS; goto trace00; } key0.addr = ip0->dst_address; key0.port = udp0->dst_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (clib_bihash_search_8_8 (&sm->per_thread_data[thread_index].out2in, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0)) { /* * 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 == SNAT_PROTOCOL_UDP && (udp0->dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next0, b0); goto trace00; } if (!sm->forwarding_enabled) { b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; next0 = SNAT_OUT2IN_NEXT_DROP; } goto trace00; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node, thread_index, now); if (!s0) { next0 = SNAT_OUT2IN_NEXT_DROP; goto trace00; } } else s0 = pool_elt_at_index (sm->per_thread_data[thread_index].sessions, value0.value); 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 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->dst_port; tcp0->dst_port = s0->in2out.port; new_port0 = tcp0->dst_port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); tcp0->checksum = ip_csum_fold (sum0); } else { old_port0 = udp0->dst_port; udp0->dst_port = s0->in2out.port; udp0->checksum = 0; } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace00: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_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 - sm->per_thread_data[thread_index].sessions; } pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP; /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, snat_out2in_node.index, SNAT_OUT2IN_ERROR_OUT2IN_PACKETS, pkts_processed); return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_out2in_node) = { .function = snat_out2in_node_fn, .name = "nat44-out2in", .vector_size = sizeof (u32), .format_trace = format_snat_out2in_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_out2in_error_strings), .error_strings = snat_out2in_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = SNAT_OUT2IN_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_OUT2IN_NEXT_DROP] = "error-drop", [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_node, snat_out2in_node_fn); static uword nat44_out2in_reass_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; snat_out2in_next_t next_index; u32 pkts_processed = 0; snat_main_t *sm = &snat_main; f64 now = vlib_time_now (vm); u32 thread_index = vm->thread_index; snat_main_per_thread_data_t *per_thread_data = &sm->per_thread_data[thread_index]; u32 *fragments_to_drop = 0; u32 *fragments_to_loopback = 0; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0, sw_if_index0, proto0, rx_fib_index0, new_addr0, old_addr0; vlib_buffer_t *b0; u32 next0; u8 cached0 = 0; ip4_header_t *ip0; nat_reass_ip4_t *reass0; udp_header_t *udp0; tcp_header_t *tcp0; snat_session_key_t key0, sm0; clib_bihash_kv_8_8_t kv0, value0; snat_session_t *s0 = 0; u16 old_port0, new_port0; ip_csum_t sum0; /* speculatively enqueue b0 to the current next frame */ bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); next0 = SNAT_OUT2IN_NEXT_LOOKUP; sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX]; rx_fib_index0 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, sw_if_index0); if (PREDICT_FALSE (nat_reass_is_drop_frag (0))) { next0 = SNAT_OUT2IN_NEXT_DROP; b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT]; goto trace0; } ip0 = (ip4_header_t *) vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; proto0 = ip_proto_to_snat_proto (ip0->protocol); reass0 = nat_ip4_reass_find_or_create (ip0->src_address, ip0->dst_address, ip0->fragment_id, ip0->protocol, 1, &fragments_to_drop); if (PREDICT_FALSE (!reass0)) { next0 = SNAT_OUT2IN_NEXT_DROP; b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_REASS]; nat_log_notice ("maximum reassemblies exceeded"); goto trace0; } if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) { key0.addr = ip0->dst_address; key0.port = udp0->dst_port; key0.protocol = proto0; key0.fib_index = rx_fib_index0; kv0.key = key0.as_u64; if (clib_bihash_search_8_8 (&per_thread_data->out2in, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ if (snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0)) { /* * 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 == SNAT_PROTOCOL_UDP && (udp0->dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next0, b0); goto trace0; } if (!sm->forwarding_enabled) { b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; next0 = SNAT_OUT2IN_NEXT_DROP; } goto trace0; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping (sm, b0, sm0, key0, node, thread_index, now); if (!s0) { b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; next0 = SNAT_OUT2IN_NEXT_DROP; goto trace0; } reass0->sess_index = s0 - per_thread_data->sessions; reass0->thread_index = thread_index; } else { s0 = pool_elt_at_index (per_thread_data->sessions, value0.value); reass0->sess_index = value0.value; } nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); } else { if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0)) { if (nat_ip4_reass_add_fragment (reass0, bi0, &fragments_to_drop)) { b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_FRAG]; nat_log_notice ("maximum fragments per reassembly exceeded"); next0 = SNAT_OUT2IN_NEXT_DROP; goto trace0; } cached0 = 1; goto trace0; } s0 = pool_elt_at_index (per_thread_data->sessions, reass0->sess_index); } 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_FALSE (ip4_is_first_fragment (ip0))) { if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->dst_port; tcp0->dst_port = s0->in2out.port; new_port0 = tcp0->dst_port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); tcp0->checksum = ip_csum_fold (sum0); } else { old_port0 = udp0->dst_port; udp0->dst_port = s0->in2out.port; udp0->checksum = 0; } } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0)); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_reass_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->cached = cached0; t->sw_if_index = sw_if_index0; t->next_index = next0; } if (cached0) { n_left_to_next++; to_next--; } else { pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP; /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } if (n_left_from == 0 && vec_len (fragments_to_loopback)) { from = vlib_frame_vector_args (frame); u32 len = vec_len (fragments_to_loopback); if (len <= VLIB_FRAME_SIZE) { clib_memcpy (from, fragments_to_loopback, sizeof (u32) * len); n_left_from = len; vec_reset_length (fragments_to_loopback); } else { clib_memcpy (from, fragments_to_loopback + (len - VLIB_FRAME_SIZE), sizeof (u32) * VLIB_FRAME_SIZE); n_left_from = VLIB_FRAME_SIZE; _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE; } } } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, nat44_out2in_reass_node.index, SNAT_OUT2IN_ERROR_OUT2IN_PACKETS, pkts_processed); nat_send_all_to_node (vm, fragments_to_drop, node, &node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT], SNAT_OUT2IN_NEXT_DROP); vec_free (fragments_to_drop); vec_free (fragments_to_loopback); return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_out2in_reass_node) = { .function = nat44_out2in_reass_node_fn, .name = "nat44-out2in-reass", .vector_size = sizeof (u32), .format_trace = format_nat44_reass_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_out2in_error_strings), .error_strings = snat_out2in_error_strings, .n_next_nodes = SNAT_OUT2IN_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_OUT2IN_NEXT_DROP] = "error-drop", [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (nat44_out2in_reass_node, nat44_out2in_reass_node_fn); static uword snat_out2in_fast_node_fn (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; snat_out2in_next_t next_index; u32 pkts_processed = 0; snat_main_t *sm = &snat_main; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from > 0 && n_left_to_next > 0) { u32 bi0; vlib_buffer_t *b0; u32 next0 = SNAT_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; snat_session_key_t key0, sm0; u32 proto0; u32 rx_fib_index0; /* speculatively enqueue b0 to the current next frame */ bi0 = from[0]; to_next[0] = bi0; from += 1; to_next += 1; n_left_from -= 1; n_left_to_next -= 1; b0 = vlib_get_buffer (vm, bi0); 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 = SNAT_OUT2IN_NEXT_ICMP_ERROR; goto trace00; } proto0 = ip_proto_to_snat_proto (ip0->protocol); if (PREDICT_FALSE (proto0 == ~0)) goto trace00; if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, ~0, 0, 0); goto trace00; } key0.addr = ip0->dst_address; key0.port = udp0->dst_port; key0.fib_index = rx_fib_index0; if (snat_static_mapping_match (sm, key0, &sm0, 1, 0, 0, 0, 0)) { b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION]; goto trace00; } new_addr0 = sm0.addr.as_u32; new_port0 = sm0.port; vnet_buffer (b0)->sw_if_index[VLIB_TX] = sm0.fib_index; 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)) { if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->dst_port; tcp0->dst_port = new_port0; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t /* cheat */ , length /* changed member */ ); tcp0->checksum = ip_csum_fold (sum0); } else { old_port0 = udp0->dst_port; udp0->dst_port = new_port0; udp0->checksum = 0; } } else { if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address /* changed member */ ); tcp0->checksum = ip_csum_fold (sum0); } } trace00: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { snat_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->sw_if_index = sw_if_index0; t->next_index = next0; } pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP; /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, snat_out2in_fast_node.index, SNAT_OUT2IN_ERROR_OUT2IN_PACKETS, pkts_processed); return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (snat_out2in_fast_node) = { .function = snat_out2in_fast_node_fn, .name = "nat44-out2in-fast", .vector_size = sizeof (u32), .format_trace = format_snat_out2in_fast_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(snat_out2in_error_strings), .error_strings = snat_out2in_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = SNAT_OUT2IN_N_NEXT, /* edit / add dispositions here */ .next_nodes = { [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [SNAT_OUT2IN_NEXT_DROP] = "error-drop", [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FUNCTION_MULTIARCH (snat_out2in_fast_node, snat_out2in_fast_node_fn); /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */