- u32 n_left_from, *from, *to_next;
- nat64_in2out_next_t next_index;
- u32 pkts_processed = 0;
- u32 *fragments_to_drop = 0;
- u32 *fragments_to_loopback = 0;
- nat64_main_t *nm = &nat64_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 > 0 && n_left_to_next > 0)
- {
- u32 bi0;
- vlib_buffer_t *b0;
- u32 next0;
- u8 cached0 = 0;
- ip6_header_t *ip60;
- u16 l4_offset0, frag_offset0;
- u8 l4_protocol0;
- nat_reass_ip6_t *reass0;
- ip6_frag_hdr_t *frag0;
- nat64_db_bib_entry_t *bibe0;
- nat64_db_st_entry_t *ste0;
- udp_header_t *udp0;
- snat_protocol_t proto0;
- u32 sw_if_index0, fib_index0;
- ip46_address_t saddr0, daddr0;
- nat64_in2out_frag_set_ctx_t ctx0;
- nat64_db_t *db = &nm->db[thread_index];
-
- /* 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 = NAT64_IN2OUT_NEXT_IP4_LOOKUP;
-
- sw_if_index0 = vnet_buffer (b0)->sw_if_index[VLIB_RX];
- fib_index0 =
- fib_table_get_index_for_sw_if_index (FIB_PROTOCOL_IP6,
- sw_if_index0);
-
- ctx0.thread_index = thread_index;
-
- if (PREDICT_FALSE (nat_reass_is_drop_frag (1)))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_DROP_FRAGMENT];
- goto trace0;
- }
-
- ip60 = (ip6_header_t *) vlib_buffer_get_current (b0);
-
- if (PREDICT_FALSE
- (ip6_parse
- (ip60, b0->current_length, &l4_protocol0, &l4_offset0,
- &frag_offset0)))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_UNKNOWN];
- goto trace0;
- }
-
- if (PREDICT_FALSE
- (!(l4_protocol0 == IP_PROTOCOL_TCP
- || l4_protocol0 == IP_PROTOCOL_UDP)))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_DROP_FRAGMENT];
- goto trace0;
- }
-
- udp0 = (udp_header_t *) u8_ptr_add (ip60, l4_offset0);
- frag0 = (ip6_frag_hdr_t *) u8_ptr_add (ip60, frag_offset0);
- proto0 = ip_proto_to_snat_proto (l4_protocol0);
-
- reass0 = nat_ip6_reass_find_or_create (ip60->src_address,
- ip60->dst_address,
- frag0->identification,
- l4_protocol0,
- 1, &fragments_to_drop);
-
- if (PREDICT_FALSE (!reass0))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_MAX_REASS];
- goto trace0;
- }
-
- if (PREDICT_TRUE (ip6_frag_hdr_offset (frag0)))
- {
- ctx0.first_frag = 0;
- if (PREDICT_FALSE (reass0->sess_index == (u32) ~ 0))
- {
- if (nat_ip6_reass_add_fragment (reass0, bi0))
- {
- b0->error = node->errors[NAT64_IN2OUT_ERROR_MAX_FRAG];
- next0 = NAT64_IN2OUT_NEXT_DROP;
- goto trace0;
- }
- cached0 = 1;
- goto trace0;
- }
- }
- else
- {
- ctx0.first_frag = 1;
-
- saddr0.as_u64[0] = ip60->src_address.as_u64[0];
- saddr0.as_u64[1] = ip60->src_address.as_u64[1];
- daddr0.as_u64[0] = ip60->dst_address.as_u64[0];
- daddr0.as_u64[1] = ip60->dst_address.as_u64[1];
-
- ste0 =
- nat64_db_st_entry_find (db, &saddr0, &daddr0,
- udp0->src_port, udp0->dst_port,
- l4_protocol0, fib_index0, 1);
- if (!ste0)
- {
- bibe0 =
- nat64_db_bib_entry_find (db, &saddr0, udp0->src_port,
- l4_protocol0, fib_index0, 1);
- if (!bibe0)
- {
- u16 out_port0;
- ip4_address_t out_addr0;
- if (nat64_alloc_out_addr_and_port
- (fib_index0, proto0, &out_addr0, &out_port0,
- thread_index))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- goto trace0;
- }
-
- bibe0 =
- nat64_db_bib_entry_create (db,
- &ip60->src_address,
- &out_addr0, udp0->src_port,
- out_port0, fib_index0,
- l4_protocol0, 0);
- if (!bibe0)
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- goto trace0;
- }
- }
- nat64_extract_ip4 (&ip60->dst_address, &daddr0.ip4,
- fib_index0);
- ste0 =
- nat64_db_st_entry_create (db, bibe0,
- &ip60->dst_address, &daddr0.ip4,
- udp0->dst_port);
- if (!ste0)
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error =
- node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- goto trace0;
- }
- }
- reass0->sess_index = nat64_db_st_entry_get_index (db, ste0);
-
- nat_ip6_reass_get_frags (reass0, &fragments_to_loopback);
- }
-
- ctx0.sess_index = reass0->sess_index;
- ctx0.proto = l4_protocol0;
- ctx0.vm = vm;
- ctx0.l4_offset = l4_offset0;
-
- if (PREDICT_FALSE (is_hairpinning (&ip60->dst_address)))
- {
- next0 = NAT64_IN2OUT_NEXT_IP6_LOOKUP;
- if (nat64_in2out_frag_hairpinning (b0, ip60, &ctx0))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_NO_TRANSLATION];
- }
- goto trace0;
- }
- else
- {
- if (ip6_to_ip4_fragmented (b0, nat64_in2out_frag_set_cb, &ctx0))
- {
- next0 = NAT64_IN2OUT_NEXT_DROP;
- b0->error = node->errors[NAT64_IN2OUT_ERROR_UNKNOWN];
- goto trace0;
- }
- }
-
- trace0:
- if (PREDICT_FALSE
- ((node->flags & VLIB_NODE_FLAG_TRACE)
- && (b0->flags & VLIB_BUFFER_IS_TRACED)))
- {
- nat64_in2out_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 != NAT64_IN2OUT_NEXT_DROP;
-
- /* verify speculative enqueue, maybe switch current next frame */
- vlib_validate_buffer_enqueue_x1 (vm, node, next_index,
- to_next, n_left_to_next,
- bi0, next0);
- }
-
- if (n_left_from == 0 && vec_len (fragments_to_loopback))
- {
- from = vlib_frame_vector_args (frame);
- u32 len = vec_len (fragments_to_loopback);
- if (len <= VLIB_FRAME_SIZE)
- {
- clib_memcpy (from, fragments_to_loopback,
- sizeof (u32) * len);
- n_left_from = len;
- vec_reset_length (fragments_to_loopback);
- }
- else
- {
- clib_memcpy (from,
- fragments_to_loopback + (len -
- VLIB_FRAME_SIZE),
- sizeof (u32) * VLIB_FRAME_SIZE);
- n_left_from = VLIB_FRAME_SIZE;
- _vec_len (fragments_to_loopback) = len - VLIB_FRAME_SIZE;
- }
- }
- }
-
- vlib_put_next_frame (vm, node, next_index, n_left_to_next);
- }
-
- vlib_node_increment_counter (vm, nat64_in2out_reass_node.index,
- NAT64_IN2OUT_ERROR_IN2OUT_PACKETS,
- pkts_processed);
-
- nat_send_all_to_node (vm, fragments_to_drop, node,
- &node->errors[NAT64_IN2OUT_ERROR_DROP_FRAGMENT],
- NAT64_IN2OUT_NEXT_DROP);
-
- vec_free (fragments_to_drop);
- vec_free (fragments_to_loopback);
- return frame->n_vectors;
-}