- 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[SNAT_OUT2IN_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[SNAT_OUT2IN_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);
- 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->outside_address_index = ~0;
- 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));
-
- 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];
-
- stats_node_index = is_slow_path ? nat44_ed_out2in_slowpath_node.index :
- nat44_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;
-
- /* 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);
- 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);
- goto trace00;
- }
- }
- else
- {
- if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP))
- {
- next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH;
- goto trace00;
- }
-
- if (ip4_is_fragment (ip0))
- {
- b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
- next0 = NAT44_ED_OUT2IN_NEXT_DROP;
- 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))
- {
- /*
- * 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 = 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;
- }
-
- /* 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);
- 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;
- }
-
- /* Accounting */
- nat44_session_update_counters (s0, now,
- vlib_buffer_length_in_chain (vm, b0));
-
- 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_DROP;
-
- 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);
- 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);
- goto trace01;
- }
- }
- else
- {
- if (PREDICT_FALSE (proto1 == ~0 || proto1 == SNAT_PROTOCOL_ICMP))
- {
- next1 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH;
- goto trace01;
- }
-
- if (ip4_is_fragment (ip1))
- {
- b1->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
- next1 = NAT44_ED_OUT2IN_NEXT_DROP;
- 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))
- {
- /*
- * 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[SNAT_OUT2IN_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;
- }
-
- /* 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);
- 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;
- }
-
- /* Accounting */
- nat44_session_update_counters (s1, now,
- vlib_buffer_length_in_chain (vm, b1));
-
- 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_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, 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;
-
- /* 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);
- 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);
- goto trace0;
- }
- }
- else
- {
- if (PREDICT_FALSE (proto0 == ~0 || proto0 == SNAT_PROTOCOL_ICMP))
- {
- next0 = NAT44_ED_OUT2IN_NEXT_SLOW_PATH;
- goto trace0;
- }
-
- if (ip4_is_fragment (ip0))
- {
- b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
- next0 = NAT44_ED_OUT2IN_NEXT_DROP;
- 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))
- {
- /*
- * 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 = 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;
- }
-
- /* 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);
- 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;
- }
-
- /* Accounting */
- nat44_session_update_counters (s0, now,
- vlib_buffer_length_in_chain (vm, b0));
-
- 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_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, stats_node_index,
- SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
- pkts_processed);
- return frame->n_vectors;
-}
-
-static uword
-nat44_ed_out2in_fast_path_fn (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return nat44_ed_out2in_node_fn_inline (vm, node, frame, 0);
-}
-
-VLIB_REGISTER_NODE (nat44_ed_out2in_node) = {
- .function = nat44_ed_out2in_fast_path_fn,
- .name = "nat44-ed-out2in",
- .vector_size = sizeof (u32),
- .format_trace = format_nat44_ed_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 = NAT44_ED_OUT2IN_N_NEXT,
-
- /* edit / add dispositions here */
- .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",
- },
-};
-
-VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_out2in_node, nat44_ed_out2in_fast_path_fn);
-
-static uword
-nat44_ed_out2in_slow_path_fn (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- return nat44_ed_out2in_node_fn_inline (vm, node, frame, 1);
-}
-
-VLIB_REGISTER_NODE (nat44_ed_out2in_slowpath_node) = {
- .function = nat44_ed_out2in_slow_path_fn,
- .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(snat_out2in_error_strings),
- .error_strings = snat_out2in_error_strings,
-
- .runtime_data_bytes = sizeof (snat_runtime_t),
-
- .n_next_nodes = NAT44_ED_OUT2IN_N_NEXT,
-
- /* edit / add dispositions here */
- .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",
- },
-};
-
-VLIB_NODE_FUNCTION_MULTIARCH (nat44_ed_out2in_slowpath_node,
- nat44_ed_out2in_slow_path_fn);
-
-/**************************/
-/*** deterministic mode ***/
-/**************************/
-static uword
-snat_det_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;
- 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;
- ip4_address_t new_addr0, old_addr0, new_addr1, old_addr1;
- u16 new_port0, old_port0, old_port1, new_port1;
- udp_header_t * udp0, * udp1;
- tcp_header_t * tcp0, * tcp1;
- u32 proto0, proto1;
- snat_det_out_key_t key0, key1;
- snat_det_map_t * dm0, * dm1;
- snat_det_session_t * ses0 = 0, * ses1 = 0;
- u32 rx_fib_index0, rx_fib_index1;
- icmp46_header_t * icmp0, * icmp1;
-
- /* 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);
-
- ip0 = vlib_buffer_get_current (b0);
- udp0 = ip4_next_header (ip0);
- tcp0 = (tcp_header_t *) udp0;
-
- sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
-
- 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 == SNAT_PROTOCOL_ICMP))
- {
- rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
- icmp0 = (icmp46_header_t *) udp0;
-
- next0 = icmp_out2in(sm, b0, ip0, icmp0, sw_if_index0,
- rx_fib_index0, node, next0, thread_index,
- &ses0, &dm0);
- goto trace0;
- }
-
- key0.ext_host_addr = ip0->src_address;
- key0.ext_host_port = tcp0->src;
- key0.out_port = tcp0->dst;
-
- dm0 = snat_det_map_by_out(sm, &ip0->dst_address);
- if (PREDICT_FALSE(!dm0))
- {
- nat_log_info ("unknown dst address: %U",
- format_ip4_address, &ip0->dst_address);
- next0 = SNAT_OUT2IN_NEXT_DROP;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- goto trace0;
- }
-
- snat_det_reverse(dm0, &ip0->dst_address,
- clib_net_to_host_u16(tcp0->dst), &new_addr0);
-
- ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
- if (PREDICT_FALSE(!ses0))
- {
- nat_log_info ("no match src %U:%d dst %U:%d for user %U",
- format_ip4_address, &ip0->src_address,
- clib_net_to_host_u16 (tcp0->src),
- format_ip4_address, &ip0->dst_address,
- clib_net_to_host_u16 (tcp0->dst),
- format_ip4_address, &new_addr0);
- next0 = SNAT_OUT2IN_NEXT_DROP;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- goto trace0;
- }
- new_port0 = ses0->in_port;
-
- old_addr0 = ip0->dst_address;
- ip0->dst_address = new_addr0;
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
-
- sum0 = ip0->checksum;
- sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
- ip4_header_t,
- dst_address /* changed member */);
- ip0->checksum = ip_csum_fold (sum0);
-
- if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
- {
- if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
- ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT;
- else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_LAST_ACK)
- snat_det_ses_close(dm0, ses0);
-
- old_port0 = tcp0->dst;
- tcp0->dst = new_port0;
-
- sum0 = tcp0->checksum;
- sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
- 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;
- }
-
- 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 (ses0)
- t->session_index = ses0 - dm0->sessions;
- }
-
- pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
-
- b1 = vlib_get_buffer (vm, bi1);
-
- ip1 = vlib_buffer_get_current (b1);
- udp1 = ip4_next_header (ip1);
- tcp1 = (tcp_header_t *) udp1;
-
- sw_if_index1 = vnet_buffer(b1)->sw_if_index[VLIB_RX];
-
- 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 == SNAT_PROTOCOL_ICMP))
- {
- rx_fib_index1 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index1);
- icmp1 = (icmp46_header_t *) udp1;
-
- next1 = icmp_out2in(sm, b1, ip1, icmp1, sw_if_index1,
- rx_fib_index1, node, next1, thread_index,
- &ses1, &dm1);
- goto trace1;
- }
-
- key1.ext_host_addr = ip1->src_address;
- key1.ext_host_port = tcp1->src;
- key1.out_port = tcp1->dst;
-
- dm1 = snat_det_map_by_out(sm, &ip1->dst_address);
- if (PREDICT_FALSE(!dm1))
- {
- nat_log_info ("unknown dst address: %U",
- format_ip4_address, &ip1->dst_address);
- next1 = SNAT_OUT2IN_NEXT_DROP;
- b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- goto trace1;
- }
-
- snat_det_reverse(dm1, &ip1->dst_address,
- clib_net_to_host_u16(tcp1->dst), &new_addr1);
-
- ses1 = snat_det_get_ses_by_out (dm1, &new_addr1, key1.as_u64);
- if (PREDICT_FALSE(!ses1))
- {
- nat_log_info ("no match src %U:%d dst %U:%d for user %U",
- format_ip4_address, &ip1->src_address,
- clib_net_to_host_u16 (tcp1->src),
- format_ip4_address, &ip1->dst_address,
- clib_net_to_host_u16 (tcp1->dst),
- format_ip4_address, &new_addr1);
- next1 = SNAT_OUT2IN_NEXT_DROP;
- b1->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- goto trace1;
- }
- new_port1 = ses1->in_port;
-
- old_addr1 = ip1->dst_address;
- ip1->dst_address = new_addr1;
- vnet_buffer(b1)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
-
- sum1 = ip1->checksum;
- sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
- ip4_header_t,
- dst_address /* changed member */);
- ip1->checksum = ip_csum_fold (sum1);
-
- if (PREDICT_TRUE(proto1 == SNAT_PROTOCOL_TCP))
- {
- if (tcp1->flags & TCP_FLAG_FIN && ses1->state == SNAT_SESSION_TCP_ESTABLISHED)
- ses1->state = SNAT_SESSION_TCP_CLOSE_WAIT;
- else if (tcp1->flags & TCP_FLAG_ACK && ses1->state == SNAT_SESSION_TCP_LAST_ACK)
- snat_det_ses_close(dm1, ses1);
-
- old_port1 = tcp1->dst;
- tcp1->dst = new_port1;
-
- sum1 = tcp1->checksum;
- sum1 = ip_csum_update (sum1, old_addr1.as_u32, new_addr1.as_u32,
- 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 = new_port1;
- udp1->checksum = 0;
- }
-
- 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 (ses1)
- t->session_index = ses1 - dm1->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;
- ip4_address_t new_addr0, old_addr0;
- u16 new_port0, old_port0;
- udp_header_t * udp0;
- tcp_header_t * tcp0;
- u32 proto0;
- snat_det_out_key_t key0;
- snat_det_map_t * dm0;
- snat_det_session_t * ses0 = 0;
- u32 rx_fib_index0;
- icmp46_header_t * icmp0;
-
- /* 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;
-
- sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
-
- 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 == SNAT_PROTOCOL_ICMP))
- {
- rx_fib_index0 = ip4_fib_table_get_index_for_sw_if_index(sw_if_index0);
- icmp0 = (icmp46_header_t *) udp0;
-
- next0 = icmp_out2in(sm, b0, ip0, icmp0, sw_if_index0,
- rx_fib_index0, node, next0, thread_index,
- &ses0, &dm0);
- goto trace00;
- }
-
- key0.ext_host_addr = ip0->src_address;
- key0.ext_host_port = tcp0->src;
- key0.out_port = tcp0->dst;
-
- dm0 = snat_det_map_by_out(sm, &ip0->dst_address);
- if (PREDICT_FALSE(!dm0))
- {
- nat_log_info ("unknown dst address: %U",
- format_ip4_address, &ip0->dst_address);
- next0 = SNAT_OUT2IN_NEXT_DROP;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- goto trace00;
- }
-
- snat_det_reverse(dm0, &ip0->dst_address,
- clib_net_to_host_u16(tcp0->dst), &new_addr0);
-
- ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
- if (PREDICT_FALSE(!ses0))
- {
- nat_log_info ("no match src %U:%d dst %U:%d for user %U",
- format_ip4_address, &ip0->src_address,
- clib_net_to_host_u16 (tcp0->src),
- format_ip4_address, &ip0->dst_address,
- clib_net_to_host_u16 (tcp0->dst),
- format_ip4_address, &new_addr0);
- next0 = SNAT_OUT2IN_NEXT_DROP;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- goto trace00;
- }
- new_port0 = ses0->in_port;
-
- old_addr0 = ip0->dst_address;
- ip0->dst_address = new_addr0;
- vnet_buffer(b0)->sw_if_index[VLIB_TX] = sm->inside_fib_index;
-
- sum0 = ip0->checksum;
- sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
- ip4_header_t,
- dst_address /* changed member */);
- ip0->checksum = ip_csum_fold (sum0);
-
- if (PREDICT_TRUE(proto0 == SNAT_PROTOCOL_TCP))
- {
- if (tcp0->flags & TCP_FLAG_FIN && ses0->state == SNAT_SESSION_TCP_ESTABLISHED)
- ses0->state = SNAT_SESSION_TCP_CLOSE_WAIT;
- else if (tcp0->flags & TCP_FLAG_ACK && ses0->state == SNAT_SESSION_TCP_LAST_ACK)
- snat_det_ses_close(dm0, ses0);
-
- old_port0 = tcp0->dst;
- tcp0->dst = new_port0;
-
- sum0 = tcp0->checksum;
- sum0 = ip_csum_update (sum0, old_addr0.as_u32, new_addr0.as_u32,
- 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;
- }
-
- 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 (ses0)
- t->session_index = ses0 - dm0->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_det_out2in_node.index,
- SNAT_OUT2IN_ERROR_OUT2IN_PACKETS,
- pkts_processed);
- return frame->n_vectors;
-}
-
-VLIB_REGISTER_NODE (snat_det_out2in_node) = {
- .function = snat_det_out2in_node_fn,
- .name = "nat44-det-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",
- },
-};
-VLIB_NODE_FUNCTION_MULTIARCH (snat_det_out2in_node, snat_det_out2in_node_fn);
-
-/**
- * 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_det(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;
- u8 protocol;
- snat_det_out_key_t key0;
- u8 dont_translate = 0;
- u32 next0 = ~0;
- icmp_echo_header_t *echo0, *inner_echo0 = 0;
- ip4_header_t *inner_ip0;
- void *l4_header = 0;
- icmp46_header_t *inner_icmp0;
- snat_det_map_t * dm0 = 0;
- ip4_address_t new_addr0 = {{0}};
- snat_det_session_t * ses0 = 0;
- ip4_address_t out_addr;
-
- icmp0 = (icmp46_header_t *) ip4_next_header (ip0);
- echo0 = (icmp_echo_header_t *)(icmp0+1);
- sw_if_index0 = vnet_buffer(b0)->sw_if_index[VLIB_RX];
-
- if (!icmp_is_error_message (icmp0))
- {
- protocol = SNAT_PROTOCOL_ICMP;
- key0.ext_host_addr = ip0->src_address;
- key0.ext_host_port = 0;
- key0.out_port = echo0->identifier;
- out_addr = ip0->dst_address;
- }
- else
- {
- inner_ip0 = (ip4_header_t *)(echo0+1);
- l4_header = ip4_next_header (inner_ip0);
- protocol = ip_proto_to_snat_proto (inner_ip0->protocol);
- key0.ext_host_addr = inner_ip0->dst_address;
- out_addr = inner_ip0->src_address;
- switch (protocol)
- {
- case SNAT_PROTOCOL_ICMP:
- inner_icmp0 = (icmp46_header_t*)l4_header;
- inner_echo0 = (icmp_echo_header_t *)(inner_icmp0+1);
- key0.ext_host_port = 0;
- key0.out_port = inner_echo0->identifier;
- break;
- case SNAT_PROTOCOL_UDP:
- case SNAT_PROTOCOL_TCP:
- key0.ext_host_port = ((tcp_udp_header_t*)l4_header)->dst_port;
- key0.out_port = ((tcp_udp_header_t*)l4_header)->src_port;
- break;
- default:
- b0->error = node->errors[SNAT_OUT2IN_ERROR_UNSUPPORTED_PROTOCOL];
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto out;
- }
- }
-
- dm0 = snat_det_map_by_out(sm, &out_addr);
- if (PREDICT_FALSE(!dm0))
- {
- /* 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;
- }
- nat_log_info ("unknown dst address: %U",
- format_ip4_address, &ip0->dst_address);
- goto out;
- }
-
- snat_det_reverse(dm0, &ip0->dst_address,
- clib_net_to_host_u16(key0.out_port), &new_addr0);
-
- ses0 = snat_det_get_ses_by_out (dm0, &new_addr0, key0.as_u64);
- if (PREDICT_FALSE(!ses0))
- {
- /* 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;
- }
- nat_log_info ("no match src %U:%d dst %U:%d for user %U",
- format_ip4_address, &key0.ext_host_addr,
- clib_net_to_host_u16 (key0.ext_host_port),
- format_ip4_address, &out_addr,
- clib_net_to_host_u16 (key0.out_port),
- format_ip4_address, &new_addr0);
- b0->error = node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto out;
- }
-
- if (PREDICT_FALSE(icmp0->type != ICMP4_echo_reply &&
- !icmp_is_error_message (icmp0)))
- {
- b0->error = node->errors[SNAT_OUT2IN_ERROR_BAD_ICMP_TYPE];
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto out;
- }
-
- goto out;
-
-out:
- *p_proto = protocol;
- if (ses0)
- {
- p_value->addr = new_addr0;
- p_value->fib_index = sm->inside_fib_index;
- p_value->port = ses0->in_port;
- }
- *p_dont_translate = dont_translate;
- if (d)
- *(snat_det_session_t**)d = ses0;
- if (e)
- *(snat_det_map_t**)e = dm0;
- return next0;
-}
-
-/**********************/
-/*** worker handoff ***/
-/**********************/
-static uword
-snat_out2in_worker_handoff_fn (vlib_main_t * vm,
- vlib_node_runtime_t * node,
- vlib_frame_t * frame)
-{
- snat_main_t *sm = &snat_main;
- vlib_thread_main_t *tm = vlib_get_thread_main ();
- u32 n_left_from, *from, *to_next = 0, *to_next_drop = 0;
- static __thread vlib_frame_queue_elt_t **handoff_queue_elt_by_worker_index;
- static __thread vlib_frame_queue_t **congested_handoff_queue_by_worker_index
- = 0;
- vlib_frame_queue_elt_t *hf = 0;
- vlib_frame_queue_t *fq;
- vlib_frame_t *f = 0;
- int i;
- u32 n_left_to_next_worker = 0, *to_next_worker = 0;
- u32 next_worker_index = 0;
- u32 current_worker_index = ~0;
- u32 thread_index = vm->thread_index;
- vlib_frame_t *d = 0;
-
- ASSERT (vec_len (sm->workers));
-
- if (PREDICT_FALSE (handoff_queue_elt_by_worker_index == 0))
- {
- vec_validate (handoff_queue_elt_by_worker_index, tm->n_vlib_mains - 1);
-
- vec_validate_init_empty (congested_handoff_queue_by_worker_index,
- tm->n_vlib_mains - 1,
- (vlib_frame_queue_t *) (~0));
- }
-
- from = vlib_frame_vector_args (frame);
- n_left_from = frame->n_vectors;
-
- while (n_left_from > 0)
- {
- u32 bi0;
- vlib_buffer_t *b0;
- u32 sw_if_index0;
- u32 rx_fib_index0;
- ip4_header_t * ip0;
- u8 do_handoff;
-
- bi0 = from[0];
- from += 1;
- n_left_from -= 1;
-
- b0 = vlib_get_buffer (vm, bi0);
-
- 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);
-
- ip0 = vlib_buffer_get_current (b0);
-
- next_worker_index = sm->worker_out2in_cb(ip0, rx_fib_index0);
-
- if (PREDICT_FALSE (next_worker_index != thread_index))
- {
- do_handoff = 1;
-
- if (next_worker_index != current_worker_index)
- {
- fq = is_vlib_frame_queue_congested (
- sm->fq_out2in_index, next_worker_index, NAT_FQ_NELTS - 2,
- congested_handoff_queue_by_worker_index);
-
- if (fq)
- {
- /* if this is 1st frame */
- if (!d)
- {
- d = vlib_get_frame_to_node (vm, sm->error_node_index);
- to_next_drop = vlib_frame_vector_args (d);
- }
-
- to_next_drop[0] = bi0;
- to_next_drop += 1;
- d->n_vectors++;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_FQ_CONGESTED];
- goto trace0;
- }
-
- if (hf)
- hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
-
- hf = vlib_get_worker_handoff_queue_elt (sm->fq_out2in_index,
- next_worker_index,
- handoff_queue_elt_by_worker_index);
-
- n_left_to_next_worker = VLIB_FRAME_SIZE - hf->n_vectors;
- to_next_worker = &hf->buffer_index[hf->n_vectors];
- current_worker_index = next_worker_index;
- }
-
- /* enqueue to correct worker thread */
- to_next_worker[0] = bi0;
- to_next_worker++;
- n_left_to_next_worker--;
-
- if (n_left_to_next_worker == 0)
- {
- hf->n_vectors = VLIB_FRAME_SIZE;
- vlib_put_frame_queue_elt (hf);
- current_worker_index = ~0;
- handoff_queue_elt_by_worker_index[next_worker_index] = 0;
- hf = 0;
- }
- }
- else
- {
- do_handoff = 0;
- /* if this is 1st frame */
- if (!f)
- {
- f = vlib_get_frame_to_node (vm, sm->out2in_node_index);
- to_next = vlib_frame_vector_args (f);
- }
-
- to_next[0] = bi0;
- to_next += 1;
- f->n_vectors++;
- }
-
-trace0:
- if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
- && (b0->flags & VLIB_BUFFER_IS_TRACED)))
- {
- snat_out2in_worker_handoff_trace_t *t =
- vlib_add_trace (vm, node, b0, sizeof (*t));
- t->next_worker_index = next_worker_index;
- t->do_handoff = do_handoff;
- }
- }
-
- if (f)
- vlib_put_frame_to_node (vm, sm->out2in_node_index, f);
-
- if (d)
- vlib_put_frame_to_node (vm, sm->error_node_index, d);
-
- if (hf)
- hf->n_vectors = VLIB_FRAME_SIZE - n_left_to_next_worker;
-
- /* Ship frames to the worker nodes */
- for (i = 0; i < vec_len (handoff_queue_elt_by_worker_index); i++)
- {
- if (handoff_queue_elt_by_worker_index[i])
- {
- hf = handoff_queue_elt_by_worker_index[i];
- /*
- * It works better to let the handoff node
- * rate-adapt, always ship the handoff queue element.
- */
- if (1 || hf->n_vectors == hf->last_n_vectors)