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_ipv4.c b/net/ipv4/tcp_ipv4.c
index 059a98f..f3ce0af 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -329,7 +329,7 @@
* errors returned from accept().
*/
inet_csk_reqsk_queue_drop(req->rsk_listener, req);
- NET_INC_STATS_BH(net, LINUX_MIB_LISTENDROPS);
+ tcp_listendrop(req->rsk_listener);
}
reqsk_put(req);
}
@@ -1246,7 +1246,7 @@
&tcp_request_sock_ipv4_ops, sk, skb);
drop:
- NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
+ tcp_listendrop(sk);
return 0;
}
EXPORT_SYMBOL(tcp_v4_conn_request);
@@ -1348,7 +1348,7 @@
exit_nonewsk:
dst_release(dst);
exit:
- NET_INC_STATS_BH(sock_net(sk), LINUX_MIB_LISTENDROPS);
+ tcp_listendrop(sk);
return NULL;
put_and_exit:
inet_csk_prepare_forced_close(newsk);