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ipv6: Do not depend on rt->n in ip6_finish_output2().

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If neigh is not found, create new one.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
YOSHIFUJI Hideaki / 吉藤英明 2013-01-17 12:54:00 +00:00 committed by David S. Miller
parent 707be1ff3d
commit 6fd6ce2056
1 changed files with 13 additions and 5 deletions
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18
net/ipv6/ip6_output.c
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@ -88,7 +88,8 @@ static int ip6_finish_output2(struct sk_buff *skb)
struct dst_entry *dst = skb_dst(skb);
struct net_device *dev = dst->dev;
struct neighbour *neigh;
struct rt6_info *rt;
struct in6_addr *nexthop;
int ret;
skb->protocol = htons(ETH_P_IPV6);
skb->dev = dev;
@ -123,10 +124,17 @@ static int ip6_finish_output2(struct sk_buff *skb)
skb->len);
}
rt = (struct rt6_info *) dst;
neigh = rt->n;
if (neigh)
return dst_neigh_output(dst, neigh, skb);
rcu_read_lock_bh();
nexthop = rt6_nexthop((struct rt6_info *)dst, &ipv6_hdr(skb)->daddr);
neigh = __ipv6_neigh_lookup_noref(dst->dev, nexthop);
if (unlikely(!neigh))
neigh = __neigh_create(&nd_tbl, nexthop, dst->dev, false);
if (!IS_ERR(neigh)) {
ret = dst_neigh_output(dst, neigh, skb);
rcu_read_unlock_bh();
return ret;
}
rcu_read_unlock_bh();
IP6_INC_STATS_BH(dev_net(dst->dev),
ip6_dst_idev(dst), IPSTATS_MIB_OUTNOROUTES);