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| author | Alexey Kuznetsov <kuznet@ms2.inr.ac.ru> | 2011-01-12 08:34:08 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-02-17 15:14:23 -0800 |
| commit | 3e7e81d9e842ba49fbe4abdc173fac61c9b14181 (patch) | |
| tree | 218558853a7ab6fae2e399b5886fcb9045ba2995 /net/ipv6 | |
| parent | bdbeaf1567cfb79e5fc5b471d4616afd1daa16c9 (diff) | |
| download | lwn-3e7e81d9e842ba49fbe4abdc173fac61c9b14181.tar.gz lwn-3e7e81d9e842ba49fbe4abdc173fac61c9b14181.zip | |
inet6: prevent network storms caused by linux IPv6 routers
[ Upstream commit 72b43d0898e97f588293b4a24b33c58c46633d81 ]
Linux IPv6 forwards unicast packets, which are link layer multicasts...
The hole was present since day one. I was 100% this check is there, but it is not.
The problem shows itself, f.e. when Microsoft Network Load Balancer runs on a network.
This software resolves IPv6 unicast addresses to multicast MAC addresses.
Signed-off-by: Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/ip6_output.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c index 94b5bf132b2e..5f8d242be3f3 100644 --- a/net/ipv6/ip6_output.c +++ b/net/ipv6/ip6_output.c @@ -401,6 +401,9 @@ int ip6_forward(struct sk_buff *skb) goto drop; } + if (skb->pkt_type != PACKET_HOST) + goto drop; + skb_forward_csum(skb); /* |