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authorChristoph Hellwig <hch@lst.de>2020-05-28 08:12:29 +0300
committerDavid S. Miller <davem@davemloft.net>2020-05-28 21:11:45 +0300
commit2de569bda2a66d1308ad3f205bb29cf4f95f5636 (patch)
treeefe6912815210ff223b905d3c08cab3824fa262b /net/ipv4/ip_sockglue.c
parentdb45c0ef258ef6c7ef3c1b8ea9e06e133e083c27 (diff)
downloadlinux-2de569bda2a66d1308ad3f205bb29cf4f95f5636.tar.xz
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 <hch@lst.de> Reviewed-by: David Howells <dhowells@redhat.com> [rxrpc bits] Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c11
1 files changed, 11 insertions, 0 deletions
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.