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netfilter: ipv6: expand skb head in ip6_route_me_harder after oif change

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Expand the skb headroom if the oif changed due to rerouting similar to
how IPv4 packets are handled.

Signed-off-by: Patrick McHardy <kaber@trash.net>
This commit is contained in:
Patrick McHardy 2012-08-26 19:14:08 +02:00 committed by Pablo Neira Ayuso
parent c7232c9979
commit 0ad352cb43
1 changed files with 8 additions and 0 deletions
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8
net/ipv6/netfilter.c
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@ -15,6 +15,7 @@ int ip6_route_me_harder(struct sk_buff *skb)
{ {
struct net *net = dev_net(skb_dst(skb)->dev); struct net *net = dev_net(skb_dst(skb)->dev);
const struct ipv6hdr *iph = ipv6_hdr(skb); const struct ipv6hdr *iph = ipv6_hdr(skb);
unsigned int hh_len;
struct dst_entry *dst; struct dst_entry *dst;
struct flowi6 fl6 = { struct flowi6 fl6 = {
.flowi6_oif = skb->sk ? skb->sk->sk_bound_dev_if : 0, .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 #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; return 0;
} }
EXPORT_SYMBOL(ip6_route_me_harder); EXPORT_SYMBOL(ip6_route_me_harder);