From 2de569bda2a66d1308ad3f205bb29cf4f95f5636 Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 28 May 2020 07:12:29 +0200 Subject: ipv4: add ip_sock_set_mtu_discover 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 Reviewed-by: David Howells [rxrpc bits] Signed-off-by: David S. Miller --- net/ipv4/ip_sockglue.c | 11 +++++++++++ 1 file changed, 11 insertions(+) (limited to 'net/ipv4/ip_sockglue.c') diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c index aca6b81da9ba..aa115be11dcf 100644 --- a/net/ipv4/ip_sockglue.c +++ b/net/ipv4/ip_sockglue.c @@ -597,6 +597,17 @@ void ip_sock_set_recverr(struct sock *sk) } EXPORT_SYMBOL(ip_sock_set_recverr); +int ip_sock_set_mtu_discover(struct sock *sk, int val) +{ + if (val < IP_PMTUDISC_DONT || val > IP_PMTUDISC_OMIT) + return -EINVAL; + lock_sock(sk); + inet_sk(sk)->pmtudisc = val; + release_sock(sk); + return 0; +} +EXPORT_SYMBOL(ip_sock_set_mtu_discover); + /* * Socket option code for IP. This is the end of the line after any * TCP,UDP etc options on an IP socket. -- cgit v1.2.3