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ipv4: add ip_sock_set_mtu_discover

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Add a helper to directly set the IP_MTU_DISCOVER sockopt from kernel
space without going through a fake uaccess.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Howells <dhowells@redhat.com> [rxrpc bits]
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig
2020-05-28 07:12:29 +02:00
committed by David S. Miller
parent db45c0ef25
commit 2de569bda2
4 changed files with 18 additions and 16 deletions
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8
net/rxrpc/local_object.c
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@@ -174,13 +174,7 @@ static int rxrpc_open_socket(struct rxrpc_local *local, struct net *net)
ip_sock_set_recverr(local->socket->sk);
/* we want to set the don't fragment bit */
opt = IP_PMTUDISC_DO;
ret = kernel_setsockopt(local->socket, SOL_IP, IP_MTU_DISCOVER,
(char *) &opt, sizeof(opt));
if (ret < 0) {
_debug("setsockopt failed");
goto error;
}
ip_sock_set_mtu_discover(local->socket->sk, IP_PMTUDISC_DO);
/* We want receive timestamps. */
sock_enable_timestamps(local->socket->sk);