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[IGMP]: workaround for IGMP v1/v2 bug

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From: David Stevens <dlstevens@us.ibm.com>

As explained at:

	http://www.cs.ucsb.edu/~krishna/igmp_dos/

With IGMP version 1 and 2 it is possible to inject a unicast
report to a client which will make it ignore multicast
reports sent later by the router.

The fix is to only accept the report if is was sent to a
multicast or unicast address.

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Stevens
2005-12-02 20:32:59 -08:00
committed by David S. Miller
parent bf031fff1f
commit 24c6927505
2 changed files with 9 additions and 1 deletions
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5
net/ipv6/mcast.c
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@@ -1231,6 +1231,11 @@ int igmp6_event_report(struct sk_buff *skb)
if (skb->pkt_type == PACKET_LOOPBACK)
return 0;
/* send our report if the MC router may not have heard this report */
if (skb->pkt_type != PACKET_MULTICAST &&
skb->pkt_type != PACKET_BROADCAST)
return 0;
if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
return -EINVAL;