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authorLinus Lüssing <linus.luessing@c0d3.blue>2015-09-11 18:39:48 +0200
committerDavid S. Miller <davem@davemloft.net>2015-09-11 15:08:20 -0700
commitc2d4fbd2163e607915cc05798ce7fb7f31117cc1 (patch)
treede70128e6dba1bc818a614bcfe776c94367a5c40 /net
parenta19a19de8310fb8ca2ca0621a9db1aab082943c5 (diff)
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bridge: fix igmpv3 / mldv2 report parsing
With the newly introduced helper functions the skb pulling is hidden in the checksumming function - and undone before returning to the caller. The IGMPv3 and MLDv2 report parsing functions in the bridge still assumed that the skb is pointing to the beginning of the IGMP/MLD message while it is now kept at the beginning of the IPv4/6 header, breaking the message parsing and creating packet loss. Fixing this by taking the offset between IP and IGMP/MLD header into account, too. Fixes: 9afd85c9e455 ("net: Export IGMP/MLD message validation code") Reported-by: Tobias Powalowski <tobias.powalowski@googlemail.com> Tested-by: Tobias Powalowski <tobias.powalowski@googlemail.com> Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/bridge/br_multicast.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 66efdc21f548..480b3de1a0e3 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -1006,7 +1006,7 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
ih = igmpv3_report_hdr(skb);
num = ntohs(ih->ngrec);
- len = sizeof(*ih);
+ len = skb_transport_offset(skb) + sizeof(*ih);
for (i = 0; i < num; i++) {
len += sizeof(*grec);
@@ -1067,7 +1067,7 @@ static int br_ip6_multicast_mld2_report(struct net_bridge *br,
icmp6h = icmp6_hdr(skb);
num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
- len = sizeof(*icmp6h);
+ len = skb_transport_offset(skb) + sizeof(*icmp6h);
for (i = 0; i < num; i++) {
__be16 *nsrcs, _nsrcs;