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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-10-17 18:13:54 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-11-04 05:28:45 +0300
commite6237b6feb37582fbd6bd7a8336d1256a6b4b4f9 (patch)
treee58abfc21a4940c9191f9772605d7cf9c4c991e9 /net/sunrpc/clnt.c
parent52f98f1a2ddd2bb561f2c7e3b19a81d816a63118 (diff)
downloadlinux-e6237b6feb37582fbd6bd7a8336d1256a6b4b4f9.tar.xz
NFSv4.1: Don't rebind to the same source port when reconnecting to the server
NFSv2, v3 and NFSv4 servers often have duplicate replay caches that look at the source port when deciding whether or not an RPC call is a replay of a previous call. This requires clients to perform strange TCP gymnastics in order to ensure that when they reconnect to the server, they bind to the same source port. NFSv4.1 and NFSv4.2 have sessions that provide proper replay semantics, that do not look at the source port of the connection. This patch therefore ensures they can ignore the rebind requirement. Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'net/sunrpc/clnt.c')
-rw-r--r--net/sunrpc/clnt.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index f7f78566be46..5baf9b9be2e8 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -591,6 +591,9 @@ struct rpc_clnt *rpc_create(struct rpc_create_args *args)
xprt->resvport = 1;
if (args->flags & RPC_CLNT_CREATE_NONPRIVPORT)
xprt->resvport = 0;
+ xprt->reuseport = 0;
+ if (args->flags & RPC_CLNT_CREATE_REUSEPORT)
+ xprt->reuseport = 1;
clnt = rpc_create_xprt(args, xprt);
if (IS_ERR(clnt) || args->nconnect <= 1)
@@ -2906,7 +2909,7 @@ int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
struct rpc_xprt *xprt;
unsigned long connect_timeout;
unsigned long reconnect_timeout;
- unsigned char resvport;
+ unsigned char resvport, reuseport;
int ret = 0;
rcu_read_lock();
@@ -2918,6 +2921,7 @@ int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
return -EAGAIN;
}
resvport = xprt->resvport;
+ reuseport = xprt->reuseport;
connect_timeout = xprt->connect_timeout;
reconnect_timeout = xprt->max_reconnect_timeout;
rcu_read_unlock();
@@ -2928,6 +2932,7 @@ int rpc_clnt_add_xprt(struct rpc_clnt *clnt,
goto out_put_switch;
}
xprt->resvport = resvport;
+ xprt->reuseport = reuseport;
if (xprt->ops->set_connect_timeout != NULL)
xprt->ops->set_connect_timeout(xprt,
connect_timeout,