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tcp: increment sk_drops for listeners

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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>
This commit is contained in:
Eric Dumazet
2016-04-01 08:52:20 -07:00
committed by David S. Miller
parent 532182cd61
commit 9caad86415
5 changed files with 24 additions and 8 deletions
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6
net/ipv4/tcp_ipv4.c
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@@ -329,7 +329,7 @@ void tcp_req_err(struct sock *sk, u32 seq, bool abort)
* 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 @@ int tcp_v4_conn_request(struct sock *sk, struct sk_buff *skb)
&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_overflow:
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);