- struct tipc_net *tn = net_generic(net, tipc_net_id);
- struct tipc_link *bcl = tn->bcl;
- struct tipc_msg *msg = buf_msg(buf);
- struct tipc_node *node;
- u32 next_in;
- u32 seqno;
- int deferred = 0;
- int pos = 0;
- struct sk_buff *iskb;
- struct sk_buff_head *arrvq, *inputq;
-
- /* Screen out unwanted broadcast messages */
- if (msg_mc_netid(msg) != tn->net_id)
- goto exit;
-
- node = tipc_node_find(net, msg_prevnode(msg));
- if (unlikely(!node))
- goto exit;
-
- tipc_node_lock(node);
- if (unlikely(!node->bclink.recv_permitted))
- goto unlock;
-
- /* Handle broadcast protocol message */
- if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) {
- if (msg_type(msg) != STATE_MSG)
- goto unlock;
- if (msg_destnode(msg) == tn->own_addr) {
- tipc_bclink_acknowledge(node, msg_bcast_ack(msg));
- tipc_bclink_lock(net);
- bcl->stats.recv_nacks++;
- tn->bclink->retransmit_to = node;
- bclink_retransmit_pkt(tn, msg_bcgap_after(msg),
- msg_bcgap_to(msg));
- tipc_bclink_unlock(net);
- tipc_node_unlock(node);
- } else {
- tipc_node_unlock(node);
- bclink_peek_nack(net, msg);
- }
- tipc_node_put(node);
- goto exit;
- }
-
- /* Handle in-sequence broadcast message */
- seqno = msg_seqno(msg);
- next_in = mod(node->bclink.last_in + 1);
- arrvq = &tn->bclink->arrvq;
- inputq = &tn->bclink->inputq;
-
- if (likely(seqno == next_in)) {
-receive:
- /* Deliver message to destination */
- if (likely(msg_isdata(msg))) {
- tipc_bclink_lock(net);
- bclink_accept_pkt(node, seqno);
- spin_lock_bh(&inputq->lock);
- __skb_queue_tail(arrvq, buf);
- spin_unlock_bh(&inputq->lock);
- node->action_flags |= TIPC_BCAST_MSG_EVT;
- tipc_bclink_unlock(net);
- tipc_node_unlock(node);
- } else if (msg_user(msg) == MSG_BUNDLER) {
- tipc_bclink_lock(net);
- bclink_accept_pkt(node, seqno);
- bcl->stats.recv_bundles++;
- bcl->stats.recv_bundled += msg_msgcnt(msg);
- pos = 0;
- while (tipc_msg_extract(buf, &iskb, &pos)) {
- spin_lock_bh(&inputq->lock);
- __skb_queue_tail(arrvq, iskb);
- spin_unlock_bh(&inputq->lock);
- }
- node->action_flags |= TIPC_BCAST_MSG_EVT;
- tipc_bclink_unlock(net);
- tipc_node_unlock(node);
- } else if (msg_user(msg) == MSG_FRAGMENTER) {
- tipc_bclink_lock(net);
- bclink_accept_pkt(node, seqno);
- tipc_buf_append(&node->bclink.reasm_buf, &buf);
- if (unlikely(!buf && !node->bclink.reasm_buf)) {
- tipc_bclink_unlock(net);
- goto unlock;
- }
- bcl->stats.recv_fragments++;
- if (buf) {
- bcl->stats.recv_fragmented++;
- msg = buf_msg(buf);
- tipc_bclink_unlock(net);
- goto receive;
- }
- tipc_bclink_unlock(net);
- tipc_node_unlock(node);
- } else {
- tipc_bclink_lock(net);
- bclink_accept_pkt(node, seqno);
- tipc_bclink_unlock(net);
- tipc_node_unlock(node);
- kfree_skb(buf);
- }
- buf = NULL;