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authorPatrick McHardy <kaber@trash.net>2007-07-09 15:33:40 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-07-10 22:19:05 -0700
commitcfbba49d80be6cf8d3872b66fc5421f119843b36 (patch)
tree2e2a966d43b6cd80c2ae7c8d5e37ab4c8a0262ad /net/ipv4
parent4839c52b01ca91be1c62761e08fb3deb3881e857 (diff)
[NET]: Avoid copying writable clones in tunnel drivers
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/ip_gre.c3
-rw-r--r--net/ipv4/ipip.c3
2 files changed, 4 insertions, 2 deletions
diff --git a/net/ipv4/ip_gre.c b/net/ipv4/ip_gre.c
index 63282934725e..5c14ed63e56c 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 ebd2f2d532f6..396437242a1b 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);