- [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",
- },
-};
-/* *INDENT-ON* */
-
-VLIB_NODE_FN (nat44_out2in_reass_node) (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, cached_fragments = 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;
- snat_session_key_t key0, sm0;
- clib_bihash_kv_8_8_t kv0, value0;
- snat_session_t *s0 = 0;
- u16 old_port0, new_port0;
- ip_csum_t sum0;
- 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 = SNAT_OUT2IN_NEXT_LOOKUP;
-
- sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
- rx_fib_index0 =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP4,
- sw_if_index0);
-
- if (PREDICT_FALSE (nat_reass_is_drop_frag (0)))
- {
- next0 = SNAT_OUT2IN_NEXT_DROP;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT];
- goto trace0;
- }
-
- ip0 = (ip4_header_t *) vlib_buffer_get_current (b0);
- udp0 = ip4_next_header (ip0);
- tcp0 = (tcp_header_t *) udp0;
- 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 = SNAT_OUT2IN_NEXT_DROP;
- b0->error = node->errors[SNAT_OUT2IN_ERROR_MAX_REASS];
- nat_log_notice ("maximum reassemblies exceeded");
- goto trace0;
- }
-
- if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
- {
- if (PREDICT_FALSE (proto0 == SNAT_PROTOCOL_ICMP))
- {
- next0 = icmp_out2in_slow_path
- (sm, b0, ip0, icmp0, sw_if_index0, rx_fib_index0, node,
- next0, now, thread_index, &s0);
-
- if (PREDICT_TRUE (next0 != SNAT_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;
- }
-
- key0.addr = ip0->dst_address;
- key0.port = udp0->dst_port;
- key0.protocol = proto0;
- key0.fib_index = rx_fib_index0;
- kv0.key = key0.as_u64;
-
- if (clib_bihash_search_8_8
- (&per_thread_data->out2in, &kv0, &value0))
- {
- /* Try to match static mapping by external address and port,
- destination address and port in packet */
- if (snat_static_mapping_match
- (sm, key0, &sm0, 1, 0, 0, 0, 0, &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[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- next0 = SNAT_OUT2IN_NEXT_DROP;
- }
- else
- {
- reass0->flags |= NAT_REASS_FLAG_ED_DONT_TRANSLATE;
- nat_ip4_reass_get_frags (reass0,
- &fragments_to_loopback);
- }
- goto trace0;
- }
-
- if (PREDICT_FALSE (identity_nat0))
- goto trace0;
-
- /* Create session initiated by host from external network */
- s0 =
- create_session_for_static_mapping (sm, b0, sm0, key0,
- node, thread_index,
- now);
- if (!s0)
- {
- b0->error =
- node->errors[SNAT_OUT2IN_ERROR_NO_TRANSLATION];
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto trace0;
- }
- reass0->sess_index = s0 - per_thread_data->sessions;
- reass0->thread_index = thread_index;
- }
- else
- {
- s0 = pool_elt_at_index (per_thread_data->sessions,
- value0.value);
- reass0->sess_index = value0.value;
- }
- nat_ip4_reass_get_frags (reass0, &fragments_to_loopback);
- }
- else
- {
- if (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[SNAT_OUT2IN_ERROR_MAX_FRAG];
- nat_log_notice
- ("maximum fragments per reassembly exceeded");
- next0 = SNAT_OUT2IN_NEXT_DROP;
- goto trace0;
- }
- cached0 = 1;
- goto trace0;
- }
- s0 = pool_elt_at_index (per_thread_data->sessions,
- reass0->sess_index);
- }
-
- old_addr0 = ip0->dst_address.as_u32;
- ip0->dst_address = s0->in2out.addr;
- new_addr0 = ip0->dst_address.as_u32;
- vnet_buffer (b0)->sw_if_index[VLIB_TX] = s0->in2out.fib_index;
-
- sum0 = ip0->checksum;
- sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
- ip4_header_t,
- dst_address /* changed member */ );
- ip0->checksum = ip_csum_fold (sum0);
-
- if (PREDICT_FALSE (ip4_is_first_fragment (ip0)))
- {
- if (PREDICT_TRUE (proto0 == SNAT_PROTOCOL_TCP))
- {
- old_port0 = tcp0->dst_port;
- tcp0->dst_port = s0->in2out.port;
- new_port0 = tcp0->dst_port;
-
- sum0 = tcp0->checksum;
- sum0 = ip_csum_update (sum0, old_addr0, new_addr0,
- ip4_header_t,
- dst_address /* changed member */ );
-
- sum0 = ip_csum_update (sum0, old_port0, new_port0,
- ip4_header_t /* cheat */ ,
- length /* changed member */ );
- tcp0->checksum = ip_csum_fold (sum0);
- }
- else
- {
- old_port0 = udp0->dst_port;
- udp0->dst_port = s0->in2out.port;
- udp0->checksum = 0;
- }
- }
-
- /* Accounting */
- nat44_session_update_counters (s0, now,
- vlib_buffer_length_in_chain (vm,
- b0));
- /* Per-user LRU list maintenance */
- nat44_session_update_lru (sm, s0, thread_index);
-
- trace0:
- if (PREDICT_FALSE ((node->flags & VLIB_NODE_FLAG_TRACE)
- && (b0->flags & VLIB_BUFFER_IS_TRACED)))
- {
- nat44_reass_trace_t *t =
- vlib_add_trace (vm, node, b0, sizeof (*t));
- t->cached = cached0;
- t->sw_if_index = sw_if_index0;
- t->next_index = next0;
- }
-
- if (cached0)
- {
- n_left_to_next++;
- to_next--;
- cached_fragments++;
- }
- else
- {
- pkts_processed += next0 != SNAT_OUT2IN_NEXT_DROP;
-
- /* verify speculative enqueue, maybe switch current next frame */
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
- to_next, n_left_to_next,
- bi0, next0);
- }
-
- if (n_left_from == 0 && vec_len (fragments_to_loopback))
- {
- from = vlib_frame_vector_args (frame);
- u32 len = vec_len (fragments_to_loopback);
- if (len <= VLIB_FRAME_SIZE)
- {
- clib_memcpy_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->out2in_reass_node_index,
- SNAT_OUT2IN_ERROR_PROCESSED_FRAGMENTS,
- pkts_processed);
- vlib_node_increment_counter (vm, sm->out2in_reass_node_index,
- SNAT_OUT2IN_ERROR_CACHED_FRAGMENTS,
- cached_fragments);
-
- nat_send_all_to_node (vm, fragments_to_drop, node,
- &node->errors[SNAT_OUT2IN_ERROR_DROP_FRAGMENT],
- SNAT_OUT2IN_NEXT_DROP);
-
- vec_free (fragments_to_drop);
- vec_free (fragments_to_loopback);
- return frame->n_vectors;
-}
-
-/* *INDENT-OFF* */
-VLIB_REGISTER_NODE (nat44_out2in_reass_node) = {
- .name = "nat44-out2in-reass",
- .vector_size = sizeof (u32),
- .format_trace = format_nat44_reass_trace,
- .type = VLIB_NODE_TYPE_INTERNAL,
-
- .n_errors = ARRAY_LEN(snat_out2in_error_strings),
- .error_strings = snat_out2in_error_strings,
-
- .n_next_nodes = SNAT_OUT2IN_N_NEXT,
-
- /* edit / add dispositions here */
- .next_nodes = {
- [SNAT_OUT2IN_NEXT_DROP] = "error-drop",
- [SNAT_OUT2IN_NEXT_LOOKUP] = "ip4-lookup",
- [SNAT_OUT2IN_NEXT_ICMP_ERROR] = "ip4-icmp-error",
- [SNAT_OUT2IN_NEXT_REASS] = "nat44-out2in-reass",