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ipv[4|6]: correct dropwatch false positive in local_deliver_finish

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I had a report recently of a user trying to use dropwatch to localise some frame
loss, and they were getting false positives.  Turned out they were using a user
space SCTP stack that used raw sockets to grab frames.  When we don't have a
registered protocol for a given packet, we record it as a drop, even if a raw
socket receieves the frame.  We should only record the drop in the event a raw
socket doesnt exist to receive the frames

Tested by the reported successfully

Signed-off-by: Neil Horman <[email protected]>
Reported-by: William Reich <[email protected]>
Tested-by: William Reich <[email protected]>
CC: "David S. Miller" <[email protected]>
CC: William Reich <[email protected]>
CC: [email protected]
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Neil Horman 2013-03-01 07:44:08 +00:00 • committed by David S. Miller
commit d8c6f4b9b7
2 changed files with 8 additions and 4 deletions
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6
net/ipv6/ip6_input.c
View file

@ -241,9 +241,11 @@ resubmit:
icmpv6_send(skb, ICMPV6_PARAMPROB,
ICMPV6_UNK_NEXTHDR, nhoff);
}
} else
kfree_skb(skb);
} else {
IP6_INC_STATS_BH(net, idev, IPSTATS_MIB_INDELIVERS);
kfree_skb(skb);
consume_skb(skb);
}
}
rcu_read_unlock();
return 0;