From 0ad352cb433ed2b05921a32b5ee20410512e2320 Mon Sep 17 00:00:00 2001 From: Patrick McHardy Date: Sun, 26 Aug 2012 19:14:08 +0200 Subject: [PATCH] netfilter: ipv6: expand skb head in ip6_route_me_harder after oif change Expand the skb headroom if the oif changed due to rerouting similar to how IPv4 packets are handled. Signed-off-by: Patrick McHardy --- net/ipv6/netfilter.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c index db31561cc8df..429089cb073d 100644 --- a/net/ipv6/netfilter.c +++ b/net/ipv6/netfilter.c @@ -15,6 +15,7 @@ int ip6_route_me_harder(struct sk_buff *skb) { struct net *net = dev_net(skb_dst(skb)->dev); const struct ipv6hdr *iph = ipv6_hdr(skb); + unsigned int hh_len; struct dst_entry *dst; struct flowi6 fl6 = { .flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, @@ -47,6 +48,13 @@ int ip6_route_me_harder(struct sk_buff *skb) } #endif + /* Change in oif may mean change in hh_len. */ + hh_len = skb_dst(skb)->dev->hard_header_len; + if (skb_headroom(skb) < hh_len && + pskb_expand_head(skb, HH_DATA_ALIGN(hh_len - skb_headroom(skb)), + 0, GFP_ATOMIC)) + return -1; + return 0; } EXPORT_SYMBOL(ip6_route_me_harder);