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authorPaolo Abeni <pabeni@redhat.com>2016-03-22 09:19:38 +0100
committerDavid S. Miller <davem@davemloft.net>2016-03-22 15:53:50 -0400
commitad0ea1989cc4d5905941d0a9e62c63ad6d859cef (patch)
tree3da2a55a9729b52a5e667bd2b4e0aa99c5d78d2f /net
parent0419f4a953f8e08faef3ec9f5dab1cf697a4d7e1 (diff)
downloadlinux-ad0ea1989cc4d5905941d0a9e62c63ad6d859cef.tar.bz2
ipv4: fix broadcast packets reception
Currently, ingress ipv4 broadcast datagrams are dropped since, in udp_v4_early_demux(), ip_check_mc_rcu() is invoked even on bcast packets. This patch addresses the issue, invoking ip_check_mc_rcu() only for mcast packets. Fixes: 6e5403093261 ("ipv4/udp: Verify multicast group is ours in upd_v4_early_demux()") Signed-off-by: Paolo Abeni <pabeni@redhat.com> Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/ipv4/udp.c12
1 files changed, 8 insertions, 4 deletions
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 836abe58a9c5..08eed5e16df0 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2070,10 +2070,14 @@ void udp_v4_early_demux(struct sk_buff *skb)
if (!in_dev)
return;
- ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr,
- iph->protocol);
- if (!ours)
- return;
+ /* we are supposed to accept bcast packets */
+ if (skb->pkt_type == PACKET_MULTICAST) {
+ ours = ip_check_mc_rcu(in_dev, iph->daddr, iph->saddr,
+ iph->protocol);
+ if (!ours)
+ return;
+ }
+
sk = __udp4_lib_mcast_demux_lookup(net, uh->dest, iph->daddr,
uh->source, iph->saddr, dif);
} else if (skb->pkt_type == PACKET_HOST) {