aboutsummaryrefslogtreecommitdiffstats
path: root/net/ipv4/ip_tunnel.c
diff options
context:
space:
mode:
authorDavid S. Miller <davem@davemloft.net>2016-02-23 00:09:14 -0500
committerDavid S. Miller <davem@davemloft.net>2016-02-23 00:09:14 -0500
commitb633353115e352d3c31c12d4c61978c810f05ea1 (patch)
tree055174a1b31a3e10fd2c505788fe6487b0028d00 /net/ipv4/ip_tunnel.c
parenttools, bpf_asm: simplify parser rule for BPF extensions (diff)
parentMerge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net (diff)
downloadlinux-dev-b633353115e352d3c31c12d4c61978c810f05ea1.tar.xz
linux-dev-b633353115e352d3c31c12d4c61978c810f05ea1.zip
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Conflicts: drivers/net/phy/bcm7xxx.c drivers/net/phy/marvell.c drivers/net/vxlan.c All three conflicts were cases of simple overlapping changes. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/ip_tunnel.c')
-rw-r--r--net/ipv4/ip_tunnel.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 4569da7dfa88..dff8a05739a2 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -891,17 +891,31 @@ done:
}
EXPORT_SYMBOL_GPL(ip_tunnel_ioctl);
-int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
+int __ip_tunnel_change_mtu(struct net_device *dev, int new_mtu, bool strict)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
int t_hlen = tunnel->hlen + sizeof(struct iphdr);
+ int max_mtu = 0xFFF8 - dev->hard_header_len - t_hlen;
- if (new_mtu < 68 ||
- new_mtu > 0xFFF8 - dev->hard_header_len - t_hlen)
+ if (new_mtu < 68)
return -EINVAL;
+
+ if (new_mtu > max_mtu) {
+ if (strict)
+ return -EINVAL;
+
+ new_mtu = max_mtu;
+ }
+
dev->mtu = new_mtu;
return 0;
}
+EXPORT_SYMBOL_GPL(__ip_tunnel_change_mtu);
+
+int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu)
+{
+ return __ip_tunnel_change_mtu(dev, new_mtu, true);
+}
EXPORT_SYMBOL_GPL(ip_tunnel_change_mtu);
static void ip_tunnel_dev_free(struct net_device *dev)