+ tc->flags &= ~TCP_CONN_SNDACK;
+
+ /* We have retransmitted packets and no dupack */
+ if (n_segs && !tc->pending_dupacks)
+ return n_segs;
+
+ if (!max_burst_size)
+ {
+ tcp_program_ack (tc);
+ return max_burst_size;
+ }
+
+ n_segs += tcp_send_acks (tc, max_burst_size);
+
+ return n_segs;
+}
+#endif /* CLIB_MARCH_VARIANT */
+
+static void
+tcp_output_handle_link_local (tcp_connection_t * tc0, vlib_buffer_t * b0,
+ u16 * next0, u32 * error0)
+{
+ ip_adjacency_t *adj;
+ adj_index_t ai;
+
+ /* Not thread safe but as long as the connection exists the adj should
+ * not be removed */
+ ai = adj_nbr_find (FIB_PROTOCOL_IP6, VNET_LINK_IP6, &tc0->c_rmt_ip,
+ tc0->sw_if_index);
+ if (ai == ADJ_INDEX_INVALID)
+ {
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
+ *next0 = TCP_OUTPUT_NEXT_DROP;
+ *error0 = TCP_ERROR_LINK_LOCAL_RW;
+ return;
+ }
+
+ adj = adj_get (ai);
+ if (PREDICT_TRUE (adj->lookup_next_index == IP_LOOKUP_NEXT_REWRITE))
+ *next0 = TCP_OUTPUT_NEXT_IP_REWRITE;
+ else if (adj->lookup_next_index == IP_LOOKUP_NEXT_ARP)
+ *next0 = TCP_OUTPUT_NEXT_IP_ARP;
+ else
+ {
+ *next0 = TCP_OUTPUT_NEXT_DROP;
+ *error0 = TCP_ERROR_LINK_LOCAL_RW;
+ }
+ vnet_buffer (b0)->ip.adj_index[VLIB_TX] = ai;
+}
+
+static void
+tcp46_output_trace_frame (vlib_main_t * vm, vlib_node_runtime_t * node,
+ u32 * to_next, u32 n_bufs)
+{
+ u32 n_trace = vlib_get_trace_count (vm, node);
+ tcp_connection_t *tc;
+ tcp_tx_trace_t *t;
+ vlib_buffer_t *b;
+ tcp_header_t *th;
+ int i;
+
+ for (i = 0; i < clib_min (n_trace, n_bufs); i++)
+ {
+ b = vlib_get_buffer (vm, to_next[i]);
+ th = vlib_buffer_get_current (b);
+ tc = tcp_connection_get (vnet_buffer (b)->tcp.connection_index,
+ vm->thread_index);
+ t = vlib_add_trace (vm, node, b, sizeof (*t));
+ clib_memcpy_fast (&t->tcp_header, th, sizeof (t->tcp_header));
+ clib_memcpy_fast (&t->tcp_connection, tc, sizeof (t->tcp_connection));
+ }
+}
+
+always_inline void
+tcp_output_push_ip (vlib_main_t * vm, vlib_buffer_t * b0,
+ tcp_connection_t * tc0, u8 is_ip4)
+{
+ tcp_header_t *th0 = 0;
+
+ th0 = vlib_buffer_get_current (b0);
+ TCP_EVT (TCP_EVT_OUTPUT, tc0, th0->flags, b0->current_length);
+ if (is_ip4)
+ {
+ vlib_buffer_push_ip4 (vm, b0, &tc0->c_lcl_ip4, &tc0->c_rmt_ip4,
+ IP_PROTOCOL_TCP, 1);
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
+ th0->checksum = 0;
+ }
+ else
+ {
+ ip6_header_t *ih0;
+ ih0 = vlib_buffer_push_ip6 (vm, b0, &tc0->c_lcl_ip6,
+ &tc0->c_rmt_ip6, IP_PROTOCOL_TCP);
+ b0->flags |= VNET_BUFFER_F_OFFLOAD_TCP_CKSUM;
+ vnet_buffer (b0)->l3_hdr_offset = (u8 *) ih0 - b0->data;
+ vnet_buffer (b0)->l4_hdr_offset = (u8 *) th0 - b0->data;
+ th0->checksum = 0;
+ }
+}
+
+always_inline void
+tcp_output_handle_packet (tcp_connection_t * tc0, vlib_buffer_t * b0,
+ vlib_node_runtime_t * error_node, u16 * next0,
+ u8 is_ip4)
+{
+ /* If next_index is not drop use it */
+ if (tc0->next_node_index)
+ {
+ *next0 = tc0->next_node_index;
+ vnet_buffer (b0)->tcp.next_node_opaque = tc0->next_node_opaque;
+ }
+
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = tc0->c_fib_index;
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
+
+ if (!is_ip4)
+ {
+ u32 error0 = 0;
+
+ if (PREDICT_FALSE (ip6_address_is_link_local_unicast (&tc0->c_rmt_ip6)))
+ tcp_output_handle_link_local (tc0, b0, next0, &error0);
+
+ if (PREDICT_FALSE (error0))