diff options
Diffstat (limited to 'net/tipc/link.c')
| -rw-r--r-- | net/tipc/link.c | 26 |
1 files changed, 12 insertions, 14 deletions
diff --git a/net/tipc/link.c b/net/tipc/link.c index 8e23ab523530..2b549f653d80 100644 --- a/net/tipc/link.c +++ b/net/tipc/link.c @@ -1077,13 +1077,14 @@ int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, { struct sk_buff_head *defq = &l->deferdq; struct tipc_msg *hdr; - u16 seqno, rcv_nxt; + u16 seqno, rcv_nxt, win_lim; int rc = 0; do { hdr = buf_msg(skb); seqno = msg_seqno(hdr); rcv_nxt = l->rcv_nxt; + win_lim = rcv_nxt + TIPC_MAX_LINK_WIN; /* Verify and update link state */ if (unlikely(msg_user(hdr) == LINK_PROTOCOL)) @@ -1098,6 +1099,12 @@ int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, /* Don't send probe at next timeout expiration */ l->silent_intv_cnt = 0; + /* Drop if outside receive window */ + if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) { + l->stats.duplicates++; + goto drop; + } + /* Forward queues and wake up waiting users */ if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) { tipc_link_advance_backlog(l, xmitq); @@ -1105,29 +1112,20 @@ int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb, link_prepare_wakeup(l); } - /* Defer reception if there is a gap in the sequence */ - if (unlikely(less(rcv_nxt, seqno))) { + /* Defer delivery if sequence gap */ + if (unlikely(seqno != rcv_nxt)) { __tipc_skb_queue_sorted(defq, skb); tipc_link_build_nack_msg(l, xmitq); break; } - /* Drop if packet already received */ - if (unlikely(more(rcv_nxt, seqno))) { - l->stats.duplicates++; - goto drop; - } - - /* Packet can be delivered */ + /* Deliver packet */ l->rcv_nxt++; l->stats.recv_info++; - if (!tipc_data_input(l, skb, l->inputq)) rc = tipc_link_input(l, skb, l->inputq); - if (rc) + if (unlikely(rc)) break; - - /* Ack at regular intervals */ if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN)) tipc_link_build_ack_msg(l, xmitq); |