diff options
| -rw-r--r-- | net/tipc/bcast.c | 36 |
1 files changed, 23 insertions, 13 deletions
diff --git a/net/tipc/bcast.c b/net/tipc/bcast.c index 5200457eaeb..bc01ca6891e 100644 --- a/net/tipc/bcast.c +++ b/net/tipc/bcast.c @@ -426,20 +426,26 @@ int tipc_bclink_send_msg(struct sk_buff *buf) void tipc_bclink_recv_pkt(struct sk_buff *buf) { struct tipc_msg *msg = buf_msg(buf); - struct tipc_node *node = tipc_node_find(msg_prevnode(msg)); + struct tipc_node *node; u32 next_in; u32 seqno; struct sk_buff *deferred; - if (unlikely(!node || !tipc_node_is_up(node) || !node->bclink.supported || - (msg_mc_netid(msg) != tipc_net_id))) { - buf_discard(buf); - return; - } + /* Screen out unwanted broadcast messages */ + + if (msg_mc_netid(msg) != tipc_net_id) + goto exit; + + node = tipc_node_find(msg_prevnode(msg)); + if (unlikely(!node)) + goto exit; + + tipc_node_lock(node); + if (unlikely(!node->bclink.supported)) + goto unlock; if (unlikely(msg_user(msg) == BCAST_PROTOCOL)) { if (msg_destnode(msg) == tipc_own_addr) { - tipc_node_lock(node); tipc_bclink_acknowledge(node, msg_bcast_ack(msg)); tipc_node_unlock(node); spin_lock_bh(&bc_lock); @@ -449,16 +455,17 @@ void tipc_bclink_recv_pkt(struct sk_buff *buf) msg_bcgap_to(msg)); spin_unlock_bh(&bc_lock); } else { + tipc_node_unlock(node); tipc_bclink_peek_nack(msg_destnode(msg), msg_bcast_tag(msg), msg_bcgap_after(msg), msg_bcgap_to(msg)); } - buf_discard(buf); - return; + goto exit; } - tipc_node_lock(node); + /* Handle in-sequence broadcast message */ + receive: deferred = node->bclink.deferred_head; next_in = mod(node->bclink.last_in + 1); @@ -491,14 +498,14 @@ receive: tipc_node_unlock(node); tipc_net_route_msg(buf); } + buf = NULL; + tipc_node_lock(node); if (deferred && (buf_seqno(deferred) == mod(next_in + 1))) { - tipc_node_lock(node); buf = deferred; msg = buf_msg(buf); node->bclink.deferred_head = deferred->next; goto receive; } - return; } else if (less(next_in, seqno)) { u32 gap_after = node->bclink.gap_after; u32 gap_to = node->bclink.gap_to; @@ -513,6 +520,7 @@ receive: else if (less(gap_after, seqno) && less(seqno, gap_to)) node->bclink.gap_to = seqno; } + buf = NULL; if (bclink_ack_allowed(node->bclink.nack_sync)) { if (gap_to != gap_after) bclink_send_nack(node); @@ -520,9 +528,11 @@ receive: } } else { bcl->stats.duplicates++; - buf_discard(buf); } +unlock: tipc_node_unlock(node); +exit: + buf_discard(buf); } u32 tipc_bclink_acks_missing(struct tipc_node *n_ptr) |