+always_inline void
+ip6_hbh_ioam_loopback_handler (vlib_buffer_t * b, ip6_header_t * ip,
+ ioam_trace_option_t * trace)
+{
+ u32 buf_index;
+ ip6_hop_by_hop_ioam_main_t *hm = &ip6_hop_by_hop_ioam_main;
+ vlib_buffer_t *b0;
+ vlib_frame_t *nf = 0;
+ u32 *to_next;
+ vlib_node_t *next_node;
+ ip6_header_t *ip6;
+ ip6_hop_by_hop_header_t *hbh;
+ ioam_trace_option_t *opt;
+ udp_ping_t *udp;
+
+ next_node = vlib_get_node_by_name (hm->vlib_main, (u8 *) "ip6-lookup");
+ nf = vlib_get_frame_to_node (hm->vlib_main, next_node->index);
+ nf->n_vectors = 0;
+ to_next = vlib_frame_vector_args (nf);
+
+ b0 = vlib_buffer_copy (hm->vlib_main, b);
+ buf_index = vlib_get_buffer_index (hm->vlib_main, b0);
+
+ vnet_buffer (b0)->sw_if_index[VLIB_RX] = 0;
+ vnet_buffer (b0)->sw_if_index[VLIB_TX] = ~0;
+
+ ip6 = vlib_buffer_get_current (b0);
+ hbh = (ip6_hop_by_hop_header_t *) (ip6 + 1);
+ opt = (ioam_trace_option_t *)
+ ip6_hbh_get_option (hbh, HBH_OPTION_TYPE_IOAM_TRACE_DATA_LIST);
+
+ udp = (udp_ping_t *) ((u8 *) hbh + ((hbh->length + 1) << 3));
+ udp_ping_create_reply_from_probe_ip6 (ip6, hbh, udp);
+ ip6_hbh_ioam_trace_set_bit (opt, BIT_LOOPBACK_REPLY);
+
+ *to_next = buf_index;
+ nf->n_vectors++;
+ to_next++;
+
+ vlib_put_frame_to_node (hm->vlib_main, next_node->index, nf);
+ ip6_ioam_trace_stats_increment_counter (IP6_IOAM_TRACE_LOOPBACK, 1);
+}