[TCP]: TCP_DEFER_ACCEPT updates - dont retxmt synack
a socket in LISTEN that had completed its 3 way handshake, but not notified
userspace because of SO_DEFER_ACCEPT, would retransmit the already
acked syn-ack during the time it was waiting for the first data byte
from the peer.
Signed-off-by: Patrick McManus <mcmanus@ducksong.com>
Acked-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index f24c7d5..8a45be9 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -461,8 +461,9 @@
reqp=&lopt->syn_table[i];
while ((req = *reqp) != NULL) {
if (time_after_eq(now, req->expires)) {
- if ((req->retrans < (inet_rsk(req)->acked ? max_retries : thresh))
- && !req->rsk_ops->rtx_syn_ack(parent, req)) {
+ if ((req->retrans < (inet_rsk(req)->acked ? max_retries : thresh)) &&
+ (inet_rsk(req)->acked ||
+ !req->rsk_ops->rtx_syn_ack(parent, req))) {
unsigned long timeo;
if (req->retrans++ == 0)