tcp: increment sk_drops for listeners
Goal: packets dropped by a listener are accounted for.
This adds tcp_listendrop() helper, and clears sk_drops in sk_clone_lock()
so that children do not inherit their parent drop count.
Note that we no longer increment LINUX_MIB_LISTENDROPS counter when
sending a SYNCOOKIE, since the SYN packet generated a SYNACK.
We already have a separate LINUX_MIB_SYNCOOKIESSENT
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/tcp_input.c b/net/ipv4/tcp_input.c
index 0ffcd07..983f04c 100644
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -6339,8 +6339,10 @@
inet_csk_reqsk_queue_hash_add(sk, req, TCP_TIMEOUT_INIT);
af_ops->send_synack(sk, dst, &fl, req,
&foc, !want_cookie);
- if (want_cookie)
- goto drop_and_free;
+ if (want_cookie) {
+ reqsk_free(req);
+ return 0;
+ }
}
reqsk_put(req);
return 0;
@@ -6350,7 +6352,7 @@
drop_and_free:
reqsk_free(req);
drop:
- NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
+ tcp_listendrop(sk);
return 0;
}
EXPORT_SYMBOL(tcp_conn_request);