2015-08-30 20:08:59

by Trond Myklebust

[permalink] [raw]
Subject: [PATCH] SUNRPC: Prevent SYN+SYNACK+RST storms

Add a shutdown() call before we release the socket in order to ensure the
reset is sent before we try to reconnect.

Signed-off-by: Trond Myklebust <[email protected]>
---
net/sunrpc/xprtsock.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index 214ca9dfb14e..7be90bc1a7c2 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -822,6 +822,8 @@ static void xs_reset_transport(struct sock_xprt *transport)
if (atomic_read(&transport->xprt.swapper))
sk_clear_memalloc(sk);

+ kernel_sock_shutdown(sock, SHUT_RDWR);
+
write_lock_bh(&sk->sk_callback_lock);
transport->inet = NULL;
transport->sock = NULL;
--
2.4.3