[PATCH 08/19] netfilter: ipv6: expand skb head in ip6_route_me_harder after oif change
From: Patrick McHardy <hidden>
Date: 2012-08-28 21:49:05
Also in:
netfilter-devel
Subsystem:
netfilter, networking [general], the rest · Maintainers:
Pablo Neira Ayuso, Florian Westphal, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
Expand the skb headroom if the oif changed due to rerouting similar to how IPv4 packets are handled. Signed-off-by: Patrick McHardy <redacted> --- net/ipv6/netfilter.c | 8 ++++++++ 1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/net/ipv6/netfilter.c b/net/ipv6/netfilter.c
index db31561..429089c 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);
--
1.7.1