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authorXin Long <lucien.xin@gmail.com>2018-02-27 14:19:39 +0300
committerDavid S. Miller <davem@davemloft.net>2018-02-27 22:36:27 +0300
commitffc2b6ee417435605ee8bb1eb4c8f02e9ff4b4a5 (patch)
tree88b7d6734abadeb9777bfc1953becb12eda30807 /net
parent9c2c2e62df3fa30fb13fbeb7512a4eede729383b (diff)
downloadlinux-ffc2b6ee417435605ee8bb1eb4c8f02e9ff4b4a5.tar.xz
ip_gre: fix IFLA_MTU ignored on NEWLINK
It's safe to remove the setting of dev's needed_headroom and mtu in __gre_tunnel_init, as discussed in [1], ip_tunnel_newlink can do it properly. Now Eric noticed that it could cover the mtu value set in do_setlink when creating a ip_gre dev. It makes IFLA_MTU param not take effect. So this patch is to remove them to make IFLA_MTU work, as in other ipv4 tunnels. [1]: https://patchwork.ozlabs.org/patch/823504/ Fixes: c54419321455 ("GRE: Refactor GRE tunneling code.") Reported-by: Eric Garver <e@erig.me> Signed-off-by: Xin Long <lucien.xin@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/ip_gre.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 45d97e9b2759..0901de42ed85 100644
--- a/net/ipv4/ip_gre.c
+++ b/net/ipv4/ip_gre.c
@@ -970,9 +970,6 @@ static void __gre_tunnel_init(struct net_device *dev)
t_hlen = tunnel->hlen + sizeof(struct iphdr);
- dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4;
- dev->mtu = ETH_DATA_LEN - t_hlen - 4;
-
dev->features |= GRE_FEATURES;
dev->hw_features |= GRE_FEATURES;
@@ -1290,8 +1287,6 @@ static int erspan_tunnel_init(struct net_device *dev)
erspan_hdr_len(tunnel->erspan_ver);
t_hlen = tunnel->hlen + sizeof(struct iphdr);
- dev->needed_headroom = LL_MAX_HEADER + t_hlen + 4;
- dev->mtu = ETH_DATA_LEN - t_hlen - 4;
dev->features |= GRE_FEATURES;
dev->hw_features |= GRE_FEATURES;
dev->priv_flags |= IFF_LIVE_ADDR_CHANGE;