From cfbba49d80be6cf8d3872b66fc5421f119843b36 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Mon, 9 Jul 2007 15:33:40 -0700 Subject: [NET]: Avoid copying writable clones in tunnel drivers Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- net/ipv6/ip6_tunnel.c | 4 ++-- net/ipv6/sit.c | 3 ++- 2 files changed, 4 insertions(+), 3 deletions(-) (limited to 'net/ipv6') diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c index a0902fbdb4e..281aee42d3f 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 1efa95a99f4..eb20bb690ab 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); -- cgit v1.2.3