+ /* Link Synching:
+ * From now on, send only one single ("dummy") SYNCH message
+ * to peer. The SYNCH message does not contain any data, just
+ * a header conveying the synch point to the peer.
+ */
+ if (mtyp == SYNCH_MSG && (tnl->peer_caps & TIPC_TUNNEL_ENHANCED)) {
+ tnlskb = tipc_msg_create(TUNNEL_PROTOCOL, SYNCH_MSG,
+ INT_H_SIZE, 0, l->addr,
+ tipc_own_addr(l->net),
+ 0, 0, 0);
+ if (!tnlskb) {
+ pr_warn("%sunable to create dummy SYNCH_MSG\n",
+ link_co_err);
+ return;
+ }
+
+ hdr = buf_msg(tnlskb);
+ syncpt = l->snd_nxt + skb_queue_len(&l->backlogq) - 1;
+ msg_set_syncpt(hdr, syncpt);
+ msg_set_bearer_id(hdr, l->peer_bearer_id);
+ __skb_queue_tail(&tnlq, tnlskb);
+ tipc_link_xmit(tnl, &tnlq, xmitq);
+ return;
+ }
+