tcp: use limited socket backlog

[ Upstream commit 6b03a53a5ab7ccf2d5d69f96cf1c739c4d2a8fb9 ]

Make tcp adapt to the limited socket backlog change.

Cc: "David S. Miller" <davem@davemloft.net>
Cc: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Cc: "Pekka Savola (ipv6)" <pekkas@netcore.fi>
Cc: Patrick McHardy <kaber@trash.net>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Acked-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 65b8ebfd078a35e909c7cbf0c4e1c7bda594ac2f..febfe1586e198a7b1f3df4260d25562d84c490d3 100644 (file)
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -1677,8 +1677,10 @@ process:
                        if (!tcp_prequeue(sk, skb))
                                ret = tcp_v4_do_rcv(sk, skb);
                }
-       } else
-               sk_add_backlog(sk, skb);
+       } else if (sk_add_backlog_limited(sk, skb)) {
+               bh_unlock_sock(sk);
+               goto discard_and_relse;
+       }
        bh_unlock_sock(sk);
 
        sock_put(sk);

diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index febfd595a40dd517d9deb5b2c574a0912669fff7..d89f405528c25ce46488a6756882f59a27265f23 100644 (file)
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -1732,8 +1732,10 @@ process:
                        if (!tcp_prequeue(sk, skb))
                                ret = tcp_v6_do_rcv(sk, skb);
                }
-       } else
-               sk_add_backlog(sk, skb);
+       } else if (sk_add_backlog_limited(sk, skb)) {
+               bh_unlock_sock(sk);
+               goto discard_and_relse;
+       }
        bh_unlock_sock(sk);
 
        sock_put(sk);