[NET]: Avoid copying writable clones in tunnel drivers Signed-off-by: Patrick McHardy --- commit f9dcf4c066b67c80d81ed2de40f62169f3bb5cf0 tree c7cf908b9b97a9d9476fa7a96372305ec1478078 parent 720d6ee708b60d1f1f61484af02c900134de0651 author Patrick McHardy Fri, 06 Jul 2007 14:25:50 +0200 committer Patrick McHardy Fri, 06 Jul 2007 14:26:34 +0200 net/ipv4/ip_gre.c | 3 ++- net/ipv4/ipip.c | 3 ++- net/ipv6/ip6_tunnel.c | 4 ++-- net/ipv6/sit.c | 3 ++- 4 files changed, 8 insertions(+), 5 deletions(-) diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c index 6328293..5c14ed6 100644 --- a/net/ipv4/ip_gre.c +++ b/net/ipv4/ip_gre.c @@ -809,7 +809,8 @@ static int ipgre_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) max_headroom = LL_RESERVED_SPACE(tdev) + gre_hlen; - if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { + if (skb_headroom(skb) < max_headroom || skb_shared(skb)|| + (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); if (!new_skb) { ip_rt_put(rt); diff --git a/net/ipv4/ipip.c b/net/ipv4/ipip.c index ebd2f2d..3964372 100644 --- a/net/ipv4/ipip.c +++ b/net/ipv4/ipip.c @@ -595,7 +595,8 @@ static int ipip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) */ max_headroom = (LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr)); - if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { + if (skb_headroom(skb) < max_headroom || skb_shared(skb) || + (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); if (!new_skb) { ip_rt_put(rt); diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index a0902fb..281aee4 100644 --- a/net/ipv6/ip6_tunnel.c +++ b/net/ipv6/ip6_tunnel.c @@ -883,8 +883,8 @@ static int ip6_tnl_xmit2(struct sk_buff *skb, */ max_headroom += LL_RESERVED_SPACE(tdev); - if (skb_headroom(skb) < max_headroom || - skb_cloned(skb) || skb_shared(skb)) { + if (skb_headroom(skb) < max_headroom || skb_shared(skb) || + (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { struct sk_buff *new_skb; if (!(new_skb = skb_realloc_headroom(skb, max_headroom))) diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c index 1efa95a..eb20bb6 100644 --- a/net/ipv6/sit.c +++ b/net/ipv6/sit.c @@ -532,7 +532,8 @@ static int ipip6_tunnel_xmit(struct sk_buff *skb, struct net_device *dev) */ max_headroom = LL_RESERVED_SPACE(tdev)+sizeof(struct iphdr); - if (skb_headroom(skb) < max_headroom || skb_cloned(skb) || skb_shared(skb)) { + if (skb_headroom(skb) < max_headroom || skb_shared(skb) || + (skb_cloned(skb) && !skb_clone_writable(skb, 0))) { struct sk_buff *new_skb = skb_realloc_headroom(skb, max_headroom); if (!new_skb) { ip_rt_put(rt);