path: root/net/ipv4/ip_tunnel.c
diff options
authorDavid S. Miller <davem@davemloft.net>2018-03-29 10:12:47 -0400
committerDavid S. Miller <davem@davemloft.net>2018-03-29 10:12:47 -0400
commit020295d95e13478ecbbbe2f44398ed4b4edb28df (patch)
treea683dd5e1661c6e0a83622f69cfc60afd45133ab /net/ipv4/ip_tunnel.c
parentqede: Fix barrier usage after tx doorbell write. (diff)
parentxfrm: Fix transport mode skb control buffer usage. (diff)
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec
Steffen Klassert says: ==================== pull request (net): ipsec 2018-03-29 1) Fix a rcu_read_lock/rcu_read_unlock imbalance in the error path of xfrm_local_error(). From Taehee Yoo. 2) Some VTI MTU fixes. From Stefano Brivio. 3) Fix a too early overwritten skb control buffer on xfrm transport mode. Please note that this pull request has a merge conflict in net/ipv4/ip_tunnel.c. The conflict is between commit f6cc9c054e77 ("ip_tunnel: Emit events for post-register MTU changes") from the net tree and commit 24fc79798b8d ("ip_tunnel: Clamp MTU to bounds on new link") from the ipsec tree. It can be solved as it is currently done in linux-next. ==================== Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_tunnel.c')
1 files changed, 6 insertions, 1 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 7b85ffad5d74..f3db1f35a79d 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -1117,7 +1117,12 @@ int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
mtu = ip_tunnel_bind_dev(dev);
- if (!tb[IFLA_MTU]) {
+ if (tb[IFLA_MTU]) {
+ unsigned int max = 0xfff8 - dev->hard_header_len - nt->hlen;
+ dev->mtu = clamp(dev->mtu, (unsigned int)ETH_MIN_MTU,
+ (unsigned int)(max - sizeof(struct iphdr)));
+ } else {
err = dev_set_mtu(dev, mtu);
if (err)
goto err_dev_set_mtu;