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net/smc: propagate file from SMC to TCP socket

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fcntl(fd, F_SETOWN, getpid()) selects the recipient of SIGURG signals
that are delivered when out-of-band data arrives on socket fd.
If an SMC socket program makes use of such an fcntl() call, it fails
in case of fallback to TCP-mode. In case of fallback the traffic is
processed with the internal TCP socket. Propagating field "file" from the
SMC socket to the internal TCP socket fixes the issue.

Reviewed-by: Karsten Graul <kgraul@linux.ibm.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ursula Braun
2019-04-11 11:17:32 +02:00
committed by David S. Miller
parent e183d4e414
commit 07603b2308
2 changed files with 28 additions and 16 deletions
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6
include/net/sock.h
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@@ -2084,12 +2084,6 @@ static inline bool skwq_has_sleeper(struct socket_wq *wq)
* @p: poll_table
*
* See the comments in the wq_has_sleeper function.
*
* Do not derive sock from filp->private_data here. An SMC socket establishes
* an internal TCP socket that is used in the fallback case. All socket
* operations on the SMC socket are then forwarded to the TCP socket. In case of
* poll, the filp->private_data pointer references the SMC socket because the
* TCP socket has no file assigned.
*/
static inline void sock_poll_wait(struct file *filp, struct socket *sock,
poll_table *p)