/* * Copyright (c) 2018 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/ethernet/ethernet.h> #include <vnet/fib/ip4_fib.h> #include <vnet/udp/udp.h> #include <vppinfra/error.h> #include <nat/nat.h> #include <nat/nat_ipfix_logging.h> #include <nat/nat_reass.h> #include <nat/nat_inlines.h> #include <nat/nat_syslog.h> #include <nat/nat_ha.h> #define foreach_nat_out2in_ed_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")\ _(NON_SYN, "non-SYN packet try to create session") \ _(TCP_PACKETS, "TCP packets") \ _(UDP_PACKETS, "UDP packets") \ _(ICMP_PACKETS, "ICMP packets") \ _(OTHER_PACKETS, "other protocol packets") \ _(FRAGMENTS, "fragments") \ _(CACHED_FRAGMENTS, "cached fragments") \ _(PROCESSED_FRAGMENTS, "processed fragments") typedef enum { #define _(sym,str) NAT_OUT2IN_ED_ERROR_##sym, foreach_nat_out2in_ed_error #undef _ NAT_OUT2IN_ED_N_ERROR, } nat_out2in_ed_error_t; static char *nat_out2in_ed_error_strings[] = { #define _(sym,string) string, foreach_nat_out2in_ed_error #undef _ }; typedef enum { NAT44_ED_OUT2IN_NEXT_DROP, NAT44_ED_OUT2IN_NEXT_LOOKUP, NAT44_ED_OUT2IN_NEXT_ICMP_ERROR, NAT44_ED_OUT2IN_NEXT_IN2OUT, NAT44_ED_OUT2IN_NEXT_SLOW_PATH, NAT44_ED_OUT2IN_NEXT_REASS, NAT44_ED_OUT2IN_N_NEXT, } nat44_ed_out2in_next_t; typedef struct { u32 sw_if_index; u32 next_index; u32 session_index; u32 is_slow_path; } nat44_ed_out2in_trace_t; static u8 * format_nat44_ed_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_ed_out2in_trace_t *t = va_arg (*args, nat44_ed_out2in_trace_t *); char *tag; tag = t->is_slow_path ? "NAT44_OUT2IN_ED_SLOW_PATH" : "NAT44_OUT2IN_ED_FAST_PATH"; s = format (s, "%s: sw_if_index %d, next index %d, session %d", tag, t->sw_if_index, t->next_index, t->session_index); return s; } static inline u32 icmp_out2in_ed_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 != NAT44_ED_OUT2IN_NEXT_DROP && s0)) { /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (sm->vlib_main, b0), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); } return next0; } #ifndef CLIB_MARCH_VARIANT int nat44_o2i_ed_is_idle_session_cb (clib_bihash_kv_16_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; nat_ed_ses_key_t ed_key; clib_bihash_kv_16_8_t ed_kv; int i; snat_address_t *a; snat_session_key_t key; snat_main_per_thread_data_t *tsm = vec_elt_at_index (sm->per_thread_data, ctx->thread_index); 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) { ed_key.l_addr = s->in2out.addr; ed_key.r_addr = s->ext_host_addr; ed_key.fib_index = s->in2out.fib_index; if (snat_is_unk_proto_session (s)) { ed_key.proto = s->in2out.port; ed_key.r_port = 0; ed_key.l_port = 0; } else { ed_key.proto = snat_proto_to_ip_proto (s->in2out.protocol); ed_key.l_port = s->in2out.port; ed_key.r_port = s->ext_host_port; } if (is_twice_nat_session (s)) { ed_key.r_addr = s->ext_host_nat_addr; ed_key.r_port = s->ext_host_nat_port; } ed_kv.key[0] = ed_key.as_u64[0]; ed_kv.key[1] = ed_key.as_u64[1]; if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &ed_kv, 0)) nat_log_warn ("in2out_ed key del failed"); if (snat_is_unk_proto_session (s)) goto delete; snat_ipfix_logging_nat44_ses_delete (ctx->thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->in2out.protocol, s->in2out.port, s->out2in.port, s->in2out.fib_index); nat_syslog_nat44_sdel (s->user_index, s->in2out.fib_index, &s->in2out.addr, s->in2out.port, &s->ext_host_nat_addr, s->ext_host_nat_port, &s->out2in.addr, s->out2in.port, &s->ext_host_addr, s->ext_host_port, s->in2out.protocol, is_twice_nat_session (s)); nat_ha_sdel (&s->out2in.addr, s->out2in.port, &s->ext_host_addr, s->ext_host_port, s->out2in.protocol, s->out2in.fib_index, ctx->thread_index); if (is_twice_nat_session (s)) { for (i = 0; i < vec_len (sm->twice_nat_addresses); i++) { key.protocol = s->in2out.protocol; key.port = s->ext_host_nat_port; a = sm->twice_nat_addresses + i; if (a->addr.as_u32 == s->ext_host_nat_addr.as_u32) { snat_free_outside_address_and_port (sm->twice_nat_addresses, ctx->thread_index, &key); break; } } } if (snat_is_session_static (s)) goto delete; snat_free_outside_address_and_port (sm->addresses, ctx->thread_index, &s->out2in); delete: nat44_delete_session (sm, s, ctx->thread_index); return 1; } return 0; } #endif static snat_session_t * create_session_for_static_mapping_ed (snat_main_t * sm, vlib_buffer_t * b, snat_session_key_t l_key, snat_session_key_t e_key, vlib_node_runtime_t * node, u32 thread_index, twice_nat_type_t twice_nat, lb_nat_type_t lb_nat, f64 now) { snat_session_t *s; snat_user_t *u; ip4_header_t *ip; udp_header_t *udp; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; clib_bihash_kv_16_8_t kv; snat_session_key_t eh_key; nat44_is_idle_session_ctx_t ctx; if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) { b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED]; nat_log_notice ("maximum sessions exceeded"); return 0; } u = nat_user_get_or_create (sm, &l_key.addr, l_key.fib_index, thread_index); if (!u) { nat_log_warn ("create NAT user failed"); return 0; } s = nat_ed_session_alloc (sm, u, thread_index, now); if (!s) { nat44_delete_user_with_no_session (sm, u, thread_index); nat_log_warn ("create NAT session failed"); return 0; } ip = vlib_buffer_get_current (b); udp = ip4_next_header (ip); s->ext_host_addr.as_u32 = ip->src_address.as_u32; s->ext_host_port = e_key.protocol == SNAT_PROTOCOL_ICMP ? 0 : udp->src_port; s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; if (lb_nat) s->flags |= SNAT_SESSION_FLAG_LOAD_BALANCING; if (lb_nat == AFFINITY_LB_NAT) s->flags |= SNAT_SESSION_FLAG_AFFINITY; s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; s->out2in = e_key; s->in2out = l_key; s->in2out.protocol = s->out2in.protocol; user_session_increment (sm, u, 1); /* Add to lookup tables */ make_ed_kv (&kv, &e_key.addr, &s->ext_host_addr, ip->protocol, e_key.fib_index, e_key.port, s->ext_host_port); kv.value = s - tsm->sessions; ctx.now = now; ctx.thread_index = thread_index; if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->out2in_ed, &kv, nat44_o2i_ed_is_idle_session_cb, &ctx)) nat_log_notice ("out2in-ed key add failed"); if (twice_nat == TWICE_NAT || (twice_nat == TWICE_NAT_SELF && ip->src_address.as_u32 == l_key.addr.as_u32)) { eh_key.protocol = e_key.protocol; if (snat_alloc_outside_address_and_port (sm->twice_nat_addresses, 0, thread_index, &eh_key, sm->port_per_thread, tsm->snat_thread_index)) { b->error = node->errors[NAT_OUT2IN_ED_ERROR_OUT_OF_PORTS]; nat44_delete_session (sm, s, thread_index); if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &kv, 0)) nat_log_notice ("out2in-ed key del failed"); return 0; } s->ext_host_nat_addr.as_u32 = eh_key.addr.as_u32; s->ext_host_nat_port = eh_key.port; s->flags |= SNAT_SESSION_FLAG_TWICE_NAT; make_ed_kv (&kv, &l_key.addr, &s->ext_host_nat_addr, ip->protocol, l_key.fib_index, l_key.port, s->ext_host_nat_port); } else { make_ed_kv (&kv, &l_key.addr, &s->ext_host_addr, ip->protocol, l_key.fib_index, l_key.port, s->ext_host_port); } kv.value = s - tsm->sessions; if (clib_bihash_add_or_overwrite_stale_16_8 (&tsm->in2out_ed, &kv, nat44_i2o_ed_is_idle_session_cb, &ctx)) nat_log_notice ("in2out-ed key add failed"); snat_ipfix_logging_nat44_ses_create (thread_index, s->in2out.addr.as_u32, s->out2in.addr.as_u32, s->in2out.protocol, s->in2out.port, s->out2in.port, s->in2out.fib_index); nat_syslog_nat44_sadd (s->user_index, s->in2out.fib_index, &s->in2out.addr, s->in2out.port, &s->ext_host_nat_addr, s->ext_host_nat_port, &s->out2in.addr, s->out2in.port, &s->ext_host_addr, s->ext_host_port, s->in2out.protocol, is_twice_nat_session (s)); 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->in2out.protocol, s->in2out.fib_index, s->flags, thread_index, 0); return s; } static_always_inline int icmp_get_ed_key (ip4_header_t * ip0, nat_ed_ses_key_t * p_key0) { icmp46_header_t *icmp0; nat_ed_ses_key_t key0; icmp_echo_header_t *echo0, *inner_echo0 = 0; ip4_header_t *inner_ip0; void *l4_header = 0; icmp46_header_t *inner_icmp0; icmp0 = (icmp46_header_t *) ip4_next_header (ip0); echo0 = (icmp_echo_header_t *) (icmp0 + 1); if (!icmp_is_error_message (icmp0)) { key0.proto = IP_PROTOCOL_ICMP; key0.l_addr = ip0->dst_address; key0.r_addr = ip0->src_address; key0.l_port = echo0->identifier; key0.r_port = 0; } else { inner_ip0 = (ip4_header_t *) (echo0 + 1); l4_header = ip4_next_header (inner_ip0); key0.proto = inner_ip0->protocol; key0.l_addr = inner_ip0->src_address; key0.r_addr = inner_ip0->dst_address; switch (ip_proto_to_snat_proto (inner_ip0->protocol)) { case SNAT_PROTOCOL_ICMP: inner_icmp0 = (icmp46_header_t *) l4_header; inner_echo0 = (icmp_echo_header_t *) (inner_icmp0 + 1); key0.l_port = inner_echo0->identifier; key0.r_port = 0; break; case SNAT_PROTOCOL_UDP: case SNAT_PROTOCOL_TCP: key0.l_port = ((tcp_udp_header_t *) l4_header)->src_port; key0.r_port = ((tcp_udp_header_t *) l4_header)->dst_port; break; default: return -1; } } *p_key0 = key0; return 0; } static int next_src_nat (snat_main_t * sm, ip4_header_t * ip, u8 proto, u16 src_port, u16 dst_port, u32 thread_index, u32 rx_fib_index) { clib_bihash_kv_16_8_t kv, value; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; make_ed_kv (&kv, &ip->src_address, &ip->dst_address, proto, rx_fib_index, src_port, dst_port); if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value)) return 1; return 0; } static void create_bypass_for_fwd (snat_main_t * sm, ip4_header_t * ip, u32 rx_fib_index, u32 thread_index) { nat_ed_ses_key_t key; clib_bihash_kv_16_8_t kv, value; udp_header_t *udp; snat_user_t *u; snat_session_t *s = 0; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; f64 now = vlib_time_now (sm->vlib_main); if (ip->protocol == IP_PROTOCOL_ICMP) { if (icmp_get_ed_key (ip, &key)) return; } else if (ip->protocol == IP_PROTOCOL_UDP || ip->protocol == IP_PROTOCOL_TCP) { udp = ip4_next_header (ip); key.r_addr = ip->src_address; key.l_addr = ip->dst_address; key.proto = ip->protocol; key.l_port = udp->dst_port; key.r_port = udp->src_port; } else { key.r_addr = ip->src_address; key.l_addr = ip->dst_address; key.proto = ip->protocol; key.l_port = key.r_port = 0; } key.fib_index = 0; kv.key[0] = key.as_u64[0]; kv.key[1] = key.as_u64[1]; if (!clib_bihash_search_16_8 (&tsm->in2out_ed, &kv, &value)) { s = pool_elt_at_index (tsm->sessions, value.value); } else { u32 proto; if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) return; u = nat_user_get_or_create (sm, &ip->dst_address, sm->inside_fib_index, thread_index); if (!u) { nat_log_warn ("create NAT user failed"); return; } s = nat_ed_session_alloc (sm, u, thread_index, now); if (!s) { nat44_delete_user_with_no_session (sm, u, thread_index); nat_log_warn ("create NAT session failed"); return; } proto = ip_proto_to_snat_proto (key.proto); s->ext_host_addr = key.r_addr; s->ext_host_port = key.r_port; s->flags |= SNAT_SESSION_FLAG_FWD_BYPASS; s->out2in.addr = key.l_addr; s->out2in.port = key.l_port; s->out2in.protocol = proto; if (proto == ~0) { s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO; s->out2in.port = ip->protocol; } s->out2in.fib_index = 0; s->in2out = s->out2in; user_session_increment (sm, u, 0); kv.value = s - tsm->sessions; if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &kv, 1)) nat_log_notice ("in2out_ed key add failed"); } if (ip->protocol == IP_PROTOCOL_TCP) { tcp_header_t *tcp = ip4_next_header (ip); if (nat44_set_tcp_session_state_o2i (sm, s, tcp, thread_index)) return; } /* Accounting */ nat44_session_update_counters (s, now, 0, thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s, thread_index); } #ifndef CLIB_MARCH_VARIANT u32 icmp_match_out2in_ed (snat_main_t * sm, vlib_node_runtime_t * node, u32 thread_index, vlib_buffer_t * b, ip4_header_t * ip, u8 * p_proto, snat_session_key_t * p_value, u8 * p_dont_translate, void *d, void *e) { u32 next = ~0, sw_if_index, rx_fib_index; icmp46_header_t *icmp; nat_ed_ses_key_t key; clib_bihash_kv_16_8_t kv, value; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; snat_session_t *s = 0; u8 dont_translate = 0, is_addr_only, identity_nat; snat_session_key_t e_key, l_key; icmp = (icmp46_header_t *) ip4_next_header (ip); sw_if_index = vnet_buffer (b)->sw_if_index[VLIB_RX]; rx_fib_index = ip4_fib_table_get_index_for_sw_if_index (sw_if_index); if (icmp_get_ed_key (ip, &key)) { b->error = node->errors[NAT_OUT2IN_ED_ERROR_UNSUPPORTED_PROTOCOL]; next = NAT44_ED_OUT2IN_NEXT_DROP; goto out; } key.fib_index = rx_fib_index; kv.key[0] = key.as_u64[0]; kv.key[1] = key.as_u64[1]; if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv, &value)) { /* Try to match static mapping */ e_key.addr = ip->dst_address; e_key.port = key.l_port; e_key.protocol = ip_proto_to_snat_proto (key.proto); e_key.fib_index = rx_fib_index; if (snat_static_mapping_match (sm, e_key, &l_key, 1, &is_addr_only, 0, 0, 0, &identity_nat)) { if (!sm->forwarding_enabled) { /* Don't NAT packet aimed at the intfc address */ if (PREDICT_FALSE (is_interface_addr (sm, node, sw_if_index, ip->dst_address.as_u32))) { dont_translate = 1; goto out; } b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; next = NAT44_ED_OUT2IN_NEXT_DROP; goto out; } else { dont_translate = 1; if (next_src_nat (sm, ip, key.proto, key.l_port, key.r_port, thread_index, rx_fib_index)) { next = NAT44_ED_OUT2IN_NEXT_IN2OUT; goto out; } create_bypass_for_fwd (sm, ip, rx_fib_index, thread_index); goto out; } } if (PREDICT_FALSE (icmp->type != ICMP4_echo_reply && (icmp->type != ICMP4_echo_request || !is_addr_only))) { b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE]; next = NAT44_ED_OUT2IN_NEXT_DROP; goto out; } if (PREDICT_FALSE (identity_nat)) { dont_translate = 1; goto out; } /* Create session initiated by host from external network */ s = create_session_for_static_mapping_ed (sm, b, l_key, e_key, node, thread_index, 0, 0, vlib_time_now (sm->vlib_main)); if (!s) { next = NAT44_ED_OUT2IN_NEXT_DROP; goto out; } } else { if (PREDICT_FALSE (icmp->type != ICMP4_echo_reply && icmp->type != ICMP4_echo_request && !icmp_is_error_message (icmp))) { b->error = node->errors[NAT_OUT2IN_ED_ERROR_BAD_ICMP_TYPE]; next = NAT44_ED_OUT2IN_NEXT_DROP; goto out; } s = pool_elt_at_index (tsm->sessions, value.value); } *p_proto = ip_proto_to_snat_proto (key.proto); out: if (s) *p_value = s->in2out; *p_dont_translate = dont_translate; if (d) *(snat_session_t **) d = s; return next; } #endif static snat_session_t * nat44_ed_out2in_unknown_proto (snat_main_t * sm, vlib_buffer_t * b, ip4_header_t * ip, u32 rx_fib_index, u32 thread_index, f64 now, vlib_main_t * vm, vlib_node_runtime_t * node) { clib_bihash_kv_8_8_t kv, value; clib_bihash_kv_16_8_t s_kv, s_value; snat_static_mapping_t *m; u32 old_addr, new_addr; ip_csum_t sum; snat_session_t *s; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; snat_user_t *u; old_addr = ip->dst_address.as_u32; make_ed_kv (&s_kv, &ip->dst_address, &ip->src_address, ip->protocol, rx_fib_index, 0, 0); if (!clib_bihash_search_16_8 (&tsm->out2in_ed, &s_kv, &s_value)) { s = pool_elt_at_index (tsm->sessions, s_value.value); new_addr = ip->dst_address.as_u32 = s->in2out.addr.as_u32; } else { if (PREDICT_FALSE (maximum_sessions_exceeded (sm, thread_index))) { b->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_SESSIONS_EXCEEDED]; nat_log_notice ("maximum sessions exceeded"); return 0; } make_sm_kv (&kv, &ip->dst_address, 0, 0, 0); if (clib_bihash_search_8_8 (&sm->static_mapping_by_external, &kv, &value)) { b->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; return 0; } m = pool_elt_at_index (sm->static_mappings, value.value); new_addr = ip->dst_address.as_u32 = m->local_addr.as_u32; u = nat_user_get_or_create (sm, &m->local_addr, m->fib_index, thread_index); if (!u) { nat_log_warn ("create NAT user failed"); return 0; } /* Create a new session */ s = nat_ed_session_alloc (sm, u, thread_index, now); if (!s) { nat44_delete_user_with_no_session (sm, u, thread_index); nat_log_warn ("create NAT session failed"); return 0; } s->ext_host_addr.as_u32 = ip->src_address.as_u32; s->flags |= SNAT_SESSION_FLAG_UNKNOWN_PROTO; s->flags |= SNAT_SESSION_FLAG_STATIC_MAPPING; s->flags |= SNAT_SESSION_FLAG_ENDPOINT_DEPENDENT; s->out2in.addr.as_u32 = old_addr; s->out2in.fib_index = rx_fib_index; s->in2out.addr.as_u32 = new_addr; s->in2out.fib_index = m->fib_index; s->in2out.port = s->out2in.port = ip->protocol; user_session_increment (sm, u, 1); /* Add to lookup tables */ s_kv.value = s - tsm->sessions; if (clib_bihash_add_del_16_8 (&tsm->out2in_ed, &s_kv, 1)) nat_log_notice ("out2in key add failed"); make_ed_kv (&s_kv, &ip->dst_address, &ip->src_address, ip->protocol, m->fib_index, 0, 0); s_kv.value = s - tsm->sessions; if (clib_bihash_add_del_16_8 (&tsm->in2out_ed, &s_kv, 1)) nat_log_notice ("in2out key add failed"); } /* Update IP checksum */ 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] = s->in2out.fib_index; /* Accounting */ nat44_session_update_counters (s, now, vlib_buffer_length_in_chain (vm, b), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s, thread_index); return s; } static inline uword nat44_ed_out2in_node_fn_inline (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame, int is_slow_path) { u32 n_left_from, *from, *to_next, pkts_processed = 0, stats_node_index; nat44_ed_out2in_next_t next_index; snat_main_t *sm = &snat_main; f64 now = vlib_time_now (vm); u32 thread_index = vm->thread_index; snat_main_per_thread_data_t *tsm = &sm->per_thread_data[thread_index]; u32 tcp_packets = 0, udp_packets = 0, icmp_packets = 0, other_packets = 0, fragments = 0; stats_node_index = is_slow_path ? sm->ed_out2in_slowpath_node_index : sm->ed_out2in_node_index; from = vlib_frame_vector_args (frame); n_left_from = frame->n_vectors; next_index = node->cached_next_index; while (n_left_from > 0) { u32 n_left_to_next; vlib_get_next_frame (vm, node, next_index, to_next, n_left_to_next); while (n_left_from >= 4 && n_left_to_next >= 2) { u32 bi0, bi1; vlib_buffer_t *b0, *b1; u32 next0, sw_if_index0, rx_fib_index0, proto0, old_addr0, new_addr0; u32 next1, sw_if_index1, rx_fib_index1, proto1, old_addr1, new_addr1; u16 old_port0, new_port0, old_port1, new_port1; ip4_header_t *ip0, *ip1; udp_header_t *udp0, *udp1; tcp_header_t *tcp0, *tcp1; icmp46_header_t *icmp0, *icmp1; snat_session_t *s0 = 0, *s1 = 0; clib_bihash_kv_16_8_t kv0, value0, kv1, value1; ip_csum_t sum0, sum1; snat_session_key_t e_key0, l_key0, e_key1, l_key1; lb_nat_type_t lb_nat0, lb_nat1; twice_nat_type_t twice_nat0, twice_nat1; u8 identity_nat0, identity_nat1; /* Prefetch next iteration. */ { vlib_buffer_t *p2, *p3; p2 = vlib_get_buffer (vm, from[2]); p3 = vlib_get_buffer (vm, from[3]); vlib_prefetch_buffer_header (p2, LOAD); vlib_prefetch_buffer_header (p3, LOAD); CLIB_PREFETCH (p2->data, CLIB_CACHE_LINE_BYTES, STORE); CLIB_PREFETCH (p3->data, CLIB_CACHE_LINE_BYTES, STORE); } /* speculatively enqueue b0 and b1 to the current next frame */ to_next[0] = bi0 = from[0]; to_next[1] = bi1 = from[1]; from += 2; to_next += 2; n_left_from -= 2; n_left_to_next -= 2; b0 = vlib_get_buffer (vm, bi0); b1 = vlib_get_buffer (vm, bi1); next0 = NAT44_ED_OUT2IN_NEXT_LOOKUP; vnet_buffer (b0)->snat.flags = 0; ip0 = vlib_buffer_get_current (b0); 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 (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_ED_OUT2IN_NEXT_ICMP_ERROR; goto trace00; } udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_header_t *) udp0; proto0 = ip_proto_to_snat_proto (ip0->protocol); if (is_slow_path) { if (PREDICT_FALSE (proto0 == ~0)) { s0 = nat44_ed_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); other_packets++; if (!sm->forwarding_enabled) { if (!s0) next0 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace00; } } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in_ed_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); icmp_packets++; goto trace00; } } else { if (PREDICT_FALSE (proto0 == ~0)) { next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace00; } if (ip4_is_fragment (ip0)) { next0 = NAT44_ED_OUT2IN_NEXT_REASS; fragments++; goto trace00; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace00; } } make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address, ip0->protocol, rx_fib_index0, udp0->dst_port, udp0->src_port); if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0)) { if (is_slow_path) { /* Try to match static mapping by external address and port, destination address and port in packet */ e_key0.addr = ip0->dst_address; e_key0.port = udp0->dst_port; e_key0.protocol = proto0; e_key0.fib_index = rx_fib_index0; if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0, &twice_nat0, &lb_nat0, &ip0->src_address, &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 == 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[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; next0 = NAT44_ED_OUT2IN_NEXT_DROP; } else { if (next_src_nat (sm, ip0, ip0->protocol, udp0->src_port, udp0->dst_port, thread_index, rx_fib_index0)) { next0 = NAT44_ED_OUT2IN_NEXT_IN2OUT; goto trace00; } create_bypass_for_fwd (sm, ip0, rx_fib_index0, thread_index); } goto trace00; } if (PREDICT_FALSE (identity_nat0)) goto trace00; if ((proto0 == SNAT_PROTOCOL_TCP) && !tcp_is_init (tcp0)) { b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN]; next0 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace00; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping_ed (sm, b0, l_key0, e_key0, node, thread_index, twice_nat0, lb_nat0, now); if (!s0) { next0 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace00; } } else { next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace00; } } else { s0 = pool_elt_at_index (tsm->sessions, value0.value); } old_addr0 = ip0->dst_address.as_u32; new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.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); if (PREDICT_FALSE (is_twice_nat_session (s0))) sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, s0->ext_host_nat_addr.as_u32, ip4_header_t, src_address); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->dst_port; new_port0 = tcp0->dst_port = s0->in2out.port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t, length); if (is_twice_nat_session (s0)) { sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, s0->ext_host_nat_addr.as_u32, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, tcp0->src_port, s0->ext_host_nat_port, ip4_header_t, length); tcp0->src_port = s0->ext_host_nat_port; ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; } tcp0->checksum = ip_csum_fold (sum0); tcp_packets++; if (nat44_set_tcp_session_state_o2i (sm, s0, tcp0, thread_index)) goto trace00; } else { udp0->dst_port = s0->in2out.port; if (is_twice_nat_session (s0)) { udp0->src_port = s0->ext_host_nat_port; ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; } udp0->checksum = 0; udp_packets++; } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace00: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ed_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = sw_if_index0; t->next_index = next0; t->session_index = ~0; if (s0) t->session_index = s0 - tsm->sessions; } pkts_processed += next0 == NAT44_ED_OUT2IN_NEXT_LOOKUP; next1 = NAT44_ED_OUT2IN_NEXT_LOOKUP; vnet_buffer (b1)->snat.flags = 0; ip1 = vlib_buffer_get_current (b1); sw_if_index1 = vnet_buffer (b1)->sw_if_index[VLIB_RX]; rx_fib_index1 = fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4, 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_ED_OUT2IN_NEXT_ICMP_ERROR; goto trace01; } udp1 = ip4_next_header (ip1); tcp1 = (tcp_header_t *) udp1; icmp1 = (icmp46_header_t *) udp1; proto1 = ip_proto_to_snat_proto (ip1->protocol); if (is_slow_path) { if (PREDICT_FALSE (proto1 == ~0)) { s1 = nat44_ed_out2in_unknown_proto (sm, b1, ip1, rx_fib_index1, thread_index, now, vm, node); other_packets++; if (!sm->forwarding_enabled) { if (!s1) next1 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace01; } } if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) { next1 = icmp_out2in_ed_slow_path (sm, b1, ip1, icmp1, sw_if_index1, rx_fib_index1, node, next1, now, thread_index, &s1); icmp_packets++; goto trace01; } } else { if (PREDICT_FALSE (proto1 == ~0)) { next1 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace01; } if (ip4_is_fragment (ip1)) { next1 = NAT44_ED_OUT2IN_NEXT_REASS; fragments++; goto trace01; } if (PREDICT_FALSE (proto1 == SNAT_PROTOCOL_ICMP)) { next1 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace01; } } make_ed_kv (&kv1, &ip1->dst_address, &ip1->src_address, ip1->protocol, rx_fib_index1, udp1->dst_port, udp1->src_port); if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv1, &value1)) { if (is_slow_path) { /* Try to match static mapping by external address and port, destination address and port in packet */ e_key1.addr = ip1->dst_address; e_key1.port = udp1->dst_port; e_key1.protocol = proto1; e_key1.fib_index = rx_fib_index1; if (snat_static_mapping_match (sm, e_key1, &l_key1, 1, 0, &twice_nat1, &lb_nat1, &ip1->src_address, &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 == SNAT_PROTOCOL_UDP && (udp1->dst_port == clib_host_to_net_u16 (UDP_DST_PORT_dhcp_to_client)))) { vnet_feature_next (&next1, b1); goto trace01; } if (!sm->forwarding_enabled) { b1->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; next1 = NAT44_ED_OUT2IN_NEXT_DROP; } else { if (next_src_nat (sm, ip1, ip1->protocol, udp1->src_port, udp1->dst_port, thread_index, rx_fib_index1)) { next1 = NAT44_ED_OUT2IN_NEXT_IN2OUT; goto trace01; } create_bypass_for_fwd (sm, ip1, rx_fib_index1, thread_index); } goto trace01; } if (PREDICT_FALSE (identity_nat1)) goto trace01; if ((proto1 == SNAT_PROTOCOL_TCP) && !tcp_is_init (tcp1)) { b1->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN]; next1 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace01; } /* Create session initiated by host from external network */ s1 = create_session_for_static_mapping_ed (sm, b1, l_key1, e_key1, node, thread_index, twice_nat1, lb_nat1, now); if (!s1) { next1 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace01; } } else { next1 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace01; } } else { s1 = pool_elt_at_index (tsm->sessions, value1.value); } old_addr1 = ip1->dst_address.as_u32; new_addr1 = ip1->dst_address.as_u32 = s1->in2out.addr.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); if (PREDICT_FALSE (is_twice_nat_session (s1))) sum1 = ip_csum_update (sum1, ip1->src_address.as_u32, s1->ext_host_nat_addr.as_u32, ip4_header_t, src_address); ip1->checksum = ip_csum_fold (sum1); if (PREDICT_TRUE (proto1 == SNAT_PROTOCOL_TCP)) { old_port1 = tcp1->dst_port; new_port1 = tcp1->dst_port = s1->in2out.port; sum1 = tcp1->checksum; sum1 = ip_csum_update (sum1, old_addr1, new_addr1, ip4_header_t, dst_address); sum1 = ip_csum_update (sum1, old_port1, new_port1, ip4_header_t, length); if (is_twice_nat_session (s1)) { sum1 = ip_csum_update (sum1, ip1->src_address.as_u32, s1->ext_host_nat_addr.as_u32, ip4_header_t, dst_address); sum1 = ip_csum_update (sum1, tcp1->src_port, s1->ext_host_nat_port, ip4_header_t, length); tcp1->src_port = s1->ext_host_nat_port; ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32; } tcp1->checksum = ip_csum_fold (sum1); tcp_packets++; if (nat44_set_tcp_session_state_o2i (sm, s1, tcp1, thread_index)) goto trace01; } else { udp1->dst_port = s1->in2out.port; if (is_twice_nat_session (s1)) { udp1->src_port = s1->ext_host_nat_port; ip1->src_address.as_u32 = s1->ext_host_nat_addr.as_u32; } udp1->checksum = 0; udp_packets++; } /* Accounting */ nat44_session_update_counters (s1, now, vlib_buffer_length_in_chain (vm, b1), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s1, thread_index); trace01: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b1->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ed_out2in_trace_t *t = vlib_add_trace (vm, node, b1, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = sw_if_index1; t->next_index = next1; t->session_index = ~0; if (s1) t->session_index = s1 - tsm->sessions; } pkts_processed += next1 == NAT44_ED_OUT2IN_NEXT_LOOKUP; /* 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, sw_if_index0, rx_fib_index0, proto0, old_addr0, new_addr0; u16 old_port0, new_port0; ip4_header_t *ip0; udp_header_t *udp0; tcp_header_t *tcp0; icmp46_header_t *icmp0; snat_session_t *s0 = 0; clib_bihash_kv_16_8_t kv0, value0; ip_csum_t sum0; snat_session_key_t e_key0, l_key0; lb_nat_type_t lb_nat0; twice_nat_type_t twice_nat0; u8 identity_nat0; /* 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 = NAT44_ED_OUT2IN_NEXT_LOOKUP; vnet_buffer (b0)->snat.flags = 0; ip0 = vlib_buffer_get_current (b0); 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 (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_ED_OUT2IN_NEXT_ICMP_ERROR; goto trace0; } udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_header_t *) udp0; proto0 = ip_proto_to_snat_proto (ip0->protocol); if (is_slow_path) { if (PREDICT_FALSE (proto0 == ~0)) { s0 = nat44_ed_out2in_unknown_proto (sm, b0, ip0, rx_fib_index0, thread_index, now, vm, node); other_packets++; if (!sm->forwarding_enabled) { if (!s0) next0 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace0; } } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in_ed_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); icmp_packets++; goto trace0; } } else { if (PREDICT_FALSE (proto0 == ~0)) { next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace0; } if (ip4_is_fragment (ip0)) { next0 = NAT44_ED_OUT2IN_NEXT_REASS; fragments++; goto trace0; } if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace0; } } make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address, ip0->protocol, rx_fib_index0, udp0->dst_port, udp0->src_port); if (clib_bihash_search_16_8 (&tsm->out2in_ed, &kv0, &value0)) { if (is_slow_path) { /* Try to match static mapping by external address and port, destination address and port in packet */ e_key0.addr = ip0->dst_address; e_key0.port = udp0->dst_port; e_key0.protocol = proto0; e_key0.fib_index = rx_fib_index0; if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0, &twice_nat0, &lb_nat0, &ip0->src_address, &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 == 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[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; next0 = NAT44_ED_OUT2IN_NEXT_DROP; } else { if (next_src_nat (sm, ip0, ip0->protocol, udp0->src_port, udp0->dst_port, thread_index, rx_fib_index0)) { next0 = NAT44_ED_OUT2IN_NEXT_IN2OUT; goto trace0; } create_bypass_for_fwd (sm, ip0, rx_fib_index0, thread_index); } goto trace0; } if (PREDICT_FALSE (identity_nat0)) goto trace0; if ((proto0 == SNAT_PROTOCOL_TCP) && !tcp_is_init (tcp0)) { b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN]; next0 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace0; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping_ed (sm, b0, l_key0, e_key0, node, thread_index, twice_nat0, lb_nat0, now); if (!s0) { next0 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace0; } } else { next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH; goto trace0; } } else { s0 = pool_elt_at_index (tsm->sessions, value0.value); } old_addr0 = ip0->dst_address.as_u32; new_addr0 = ip0->dst_address.as_u32 = s0->in2out.addr.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); if (PREDICT_FALSE (is_twice_nat_session (s0))) sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, s0->ext_host_nat_addr.as_u32, ip4_header_t, src_address); ip0->checksum = ip_csum_fold (sum0); if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP)) { old_port0 = tcp0->dst_port; new_port0 = tcp0->dst_port = s0->in2out.port; sum0 = tcp0->checksum; sum0 = ip_csum_update (sum0, old_addr0, new_addr0, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, old_port0, new_port0, ip4_header_t, length); if (is_twice_nat_session (s0)) { sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, s0->ext_host_nat_addr.as_u32, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, tcp0->src_port, s0->ext_host_nat_port, ip4_header_t, length); tcp0->src_port = s0->ext_host_nat_port; ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; } tcp0->checksum = ip_csum_fold (sum0); tcp_packets++; if (nat44_set_tcp_session_state_o2i (sm, s0, tcp0, thread_index)) goto trace0; } else { udp0->dst_port = s0->in2out.port; if (is_twice_nat_session (s0)) { udp0->src_port = s0->ext_host_nat_port; ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; } udp0->checksum = 0; udp_packets++; } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { nat44_ed_out2in_trace_t *t = vlib_add_trace (vm, node, b0, sizeof (*t)); t->is_slow_path = is_slow_path; t->sw_if_index = sw_if_index0; t->next_index = next0; t->session_index = ~0; if (s0) t->session_index = s0 - tsm->sessions; } pkts_processed += next0 == NAT44_ED_OUT2IN_NEXT_LOOKUP; /* verify speculative enqueue, maybe switch current next frame */ vlib_validate_buffer_enqueue_x1 (vm, node, next_index, to_next, n_left_to_next, bi0, next0); } vlib_put_next_frame (vm, node, next_index, n_left_to_next); } vlib_node_increment_counter (vm, stats_node_index, NAT_OUT2IN_ED_ERROR_OUT2IN_PACKETS, pkts_processed); vlib_node_increment_counter (vm, stats_node_index, NAT_OUT2IN_ED_ERROR_TCP_PACKETS, tcp_packets); vlib_node_increment_counter (vm, stats_node_index, NAT_OUT2IN_ED_ERROR_UDP_PACKETS, udp_packets); vlib_node_increment_counter (vm, stats_node_index, NAT_OUT2IN_ED_ERROR_ICMP_PACKETS, icmp_packets); vlib_node_increment_counter (vm, stats_node_index, NAT_OUT2IN_ED_ERROR_OTHER_PACKETS, other_packets); vlib_node_increment_counter (vm, stats_node_index, NAT_OUT2IN_ED_ERROR_FRAGMENTS, fragments); return frame->n_vectors; } VLIB_NODE_FN (nat44_ed_out2in_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_out2in_node_fn_inline (vm, node, frame, 0); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_out2in_node) = { .name = "nat44-ed-out2in", .vector_size = sizeof (u32), .format_trace = format_nat44_ed_out2in_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings), .error_strings = nat_out2in_ed_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = NAT44_ED_OUT2IN_N_NEXT, .next_nodes = { [NAT44_ED_OUT2IN_NEXT_DROP] = "error-drop", [NAT44_ED_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [NAT44_ED_OUT2IN_NEXT_SLOW_PATH] = "nat44-ed-out2in-slowpath", [NAT44_ED_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT44_ED_OUT2IN_NEXT_IN2OUT] = "nat44-ed-in2out", [NAT44_ED_OUT2IN_NEXT_REASS] = "nat44-ed-out2in-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (nat44_ed_out2in_slowpath_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { return nat44_ed_out2in_node_fn_inline (vm, node, frame, 1); } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_out2in_slowpath_node) = { .name = "nat44-ed-out2in-slowpath", .vector_size = sizeof (u32), .format_trace = format_nat44_ed_out2in_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings), .error_strings = nat_out2in_ed_error_strings, .runtime_data_bytes = sizeof (snat_runtime_t), .n_next_nodes = NAT44_ED_OUT2IN_N_NEXT, .next_nodes = { [NAT44_ED_OUT2IN_NEXT_DROP] = "error-drop", [NAT44_ED_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [NAT44_ED_OUT2IN_NEXT_SLOW_PATH] = "nat44-ed-out2in-slowpath", [NAT44_ED_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT44_ED_OUT2IN_NEXT_IN2OUT] = "nat44-ed-in2out", [NAT44_ED_OUT2IN_NEXT_REASS] = "nat44-ed-out2in-reass", }, }; /* *INDENT-ON* */ VLIB_NODE_FN (nat44_ed_out2in_reass_node) (vlib_main_t * vm, vlib_node_runtime_t * node, vlib_frame_t * frame) { u32 n_left_from, *from, *to_next; nat44_ed_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; icmp46_header_t *icmp0; clib_bihash_kv_16_8_t kv0, value0; snat_session_t *s0 = 0; u16 old_port0, new_port0; ip_csum_t sum0; snat_session_key_t e_key0, l_key0; lb_nat_type_t lb0; twice_nat_type_t twice_nat0; u8 identity_nat0; /* 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 = NAT44_ED_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 = NAT44_ED_OUT2IN_NEXT_DROP; b0->error = node->errors[NAT_OUT2IN_ED_ERROR_DROP_FRAGMENT]; goto trace0; } ip0 = (ip4_header_t *) vlib_buffer_get_current (b0); udp0 = ip4_next_header (ip0); tcp0 = (tcp_header_t *) udp0; icmp0 = (icmp46_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 = NAT44_ED_OUT2IN_NEXT_DROP; b0->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_REASS]; nat_log_notice ("maximum reassemblies exceeded"); goto trace0; } if (PREDICT_FALSE (ip4_is_first_fragment (ip0))) { if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP)) { next0 = icmp_out2in_ed_slow_path (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node, next0, now, thread_index, &s0); if (PREDICT_TRUE (next0 != NAT44_ED_OUT2IN_NEXT_DROP)) { if (s0) reass0->sess_index = s0 - per_thread_data->sessions; else reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; reass0->thread_index = thread_index; nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); } goto trace0; } make_ed_kv (&kv0, &ip0->dst_address, &ip0->src_address, ip0->protocol, rx_fib_index0, udp0->dst_port, udp0->src_port); if (clib_bihash_search_16_8 (&per_thread_data->out2in_ed, &kv0, &value0)) { /* Try to match static mapping by external address and port, destination address and port in packet */ e_key0.addr = ip0->dst_address; e_key0.port = udp0->dst_port; e_key0.protocol = proto0; e_key0.fib_index = rx_fib_index0; if (snat_static_mapping_match (sm, e_key0, &l_key0, 1, 0, &twice_nat0, &lb0, 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 == 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[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; next0 = NAT44_ED_OUT2IN_NEXT_DROP; } else { if (next_src_nat (sm, ip0, ip0->protocol, udp0->src_port, udp0->dst_port, thread_index, rx_fib_index0)) { next0 = NAT44_ED_OUT2IN_NEXT_IN2OUT; goto trace0; } create_bypass_for_fwd (sm, ip0, rx_fib_index0, thread_index); reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; nat_ip4_reass_get_frags (reass0, &fragments_to_loopback); } goto trace0; } if (PREDICT_FALSE (identity_nat0)) { reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE; goto trace0; } if ((proto0 == SNAT_PROTOCOL_TCP) && !tcp_is_init (tcp0)) { b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NON_SYN]; next0 = NAT44_ED_OUT2IN_NEXT_DROP; goto trace0; } /* Create session initiated by host from external network */ s0 = create_session_for_static_mapping_ed (sm, b0, l_key0, e_key0, node, thread_index, twice_nat0, lb0, now); if (!s0) { b0->error = node->errors[NAT_OUT2IN_ED_ERROR_NO_TRANSLATION]; next0 = NAT44_ED_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 (reass0->flags & NAT_REASS_FLAG_ED_DONT_TRANSLATE) goto trace0; if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0)) { if (nat_ip4_reass_add_fragment (thread_index, reass0, bi0, &fragments_to_drop)) { b0->error = node->errors[NAT_OUT2IN_ED_ERROR_MAX_FRAG]; nat_log_notice ("maximum fragments per reassembly exceeded"); next0 = NAT44_ED_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 */ ); if (PREDICT_FALSE (is_twice_nat_session (s0))) sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, s0->ext_host_nat_addr.as_u32, ip4_header_t, src_address); 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 */ ); if (is_twice_nat_session (s0)) { sum0 = ip_csum_update (sum0, ip0->src_address.as_u32, s0->ext_host_nat_addr.as_u32, ip4_header_t, dst_address); sum0 = ip_csum_update (sum0, tcp0->src_port, s0->ext_host_nat_port, ip4_header_t, length); tcp0->src_port = s0->ext_host_nat_port; ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; } tcp0->checksum = ip_csum_fold (sum0); } else { old_port0 = udp0->dst_port; udp0->dst_port = s0->in2out.port; if (is_twice_nat_session (s0)) { udp0->src_port = s0->ext_host_nat_port; ip0->src_address.as_u32 = s0->ext_host_nat_addr.as_u32; } udp0->checksum = 0; } } /* Accounting */ nat44_session_update_counters (s0, now, vlib_buffer_length_in_chain (vm, b0), thread_index); /* Per-user LRU list maintenance */ nat44_session_update_lru (sm, s0, thread_index); trace0: if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE) && (b0->flags & VLIB_BUFFER_IS_TRACED))) { 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 != NAT44_ED_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_fast (from, fragments_to_loopback, sizeof (u32) * len); n_left_from = len; vec_reset_length (fragments_to_loopback); } else { clib_memcpy_fast (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, sm->ed_out2in_reass_node_index, NAT_OUT2IN_ED_ERROR_OUT2IN_PACKETS, pkts_processed); nat_send_all_to_node (vm, fragments_to_drop, node, &node->errors[NAT_OUT2IN_ED_ERROR_DROP_FRAGMENT], NAT44_ED_OUT2IN_NEXT_DROP); vec_free (fragments_to_drop); vec_free (fragments_to_loopback); return frame->n_vectors; } /* *INDENT-OFF* */ VLIB_REGISTER_NODE (nat44_ed_out2in_reass_node) = { .name = "nat44-ed-out2in-reass", .vector_size = sizeof (u32), .format_trace = format_nat44_reass_trace, .type = VLIB_NODE_TYPE_INTERNAL, .n_errors = ARRAY_LEN(nat_out2in_ed_error_strings), .error_strings = nat_out2in_ed_error_strings, .n_next_nodes = NAT44_ED_OUT2IN_N_NEXT, .next_nodes = { [NAT44_ED_OUT2IN_NEXT_DROP] = "error-drop", [NAT44_ED_OUT2IN_NEXT_LOOKUP] = "ip4-lookup", [NAT44_ED_OUT2IN_NEXT_SLOW_PATH] = "nat44-ed-out2in-slowpath", [NAT44_ED_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error", [NAT44_ED_OUT2IN_NEXT_IN2OUT] = "nat44-ed-in2out", [NAT44_ED_OUT2IN_NEXT_REASS] = "nat44-ed-out2in-reass", }, }; /* *INDENT-ON* */ /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */