On Sun, Mar 27, 2011 at 08:27:23AM +0200, Linus Lüssing wrote: > In contrast to IGMP, the MLDv1/2 message checksum needs to include an > IPv6 "pseudo-header" in the calculations (see RFC2710, section 3.3; > RFC3810, section 5.1.2). > > The multicast snooping feature of the bridge code however did not take > this "pseudo-header" into consideration for the checksum validation when > parsing a snooped IPv6 MLDv1/2 message of another host, leading to > possibly ignored, though valid MLDv1/2 messages. This commit shall fix > this issue. > > Signed-off-by: Linus Lüssing <linus.luessing@xxxxxx> > --- > net/bridge/br_multicast.c | 5 ++++- > 1 files changed, 4 insertions(+), 1 deletions(-) > > diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c > index f61eb2e..47fae4f 100644 > --- a/net/bridge/br_multicast.c > +++ b/net/bridge/br_multicast.c > @@ -1525,7 +1525,10 @@ static int br_multicast_ipv6_rcv(struct net_bridge *br, > break; > /*FALLTHROUGH*/ > case CHECKSUM_NONE: > - skb2->csum = 0; > + skb2->csum = ~csum_unfold(csum_ipv6_magic(&ip6h->saddr, > + &ip6h->daddr, > + skb2->len, > + nexthdr, 0)); You also need to include the pseudo-header for the CHECKSUM_COMPLETE case, before we've fallen through (which only happens if the hardware checksum doesn't match). Thanks, -- Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt _______________________________________________ Bridge mailing list Bridge@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/bridge
