From: Fernando Luis Vázquez Cao Date: Mon, 13 Jun 2011 15:04:43 +0000 (+0000) Subject: IGMP snooping: set mrouters_only flag for IPv4 traffic properly X-Git-Tag: v3.0-rc4~5^2~24 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=62b2bcb49cca72f6d3f39f831127a6ab315a475d;p=pandora-kernel.git IGMP snooping: set mrouters_only flag for IPv4 traffic properly Upon reception of a IGMP/IGMPv2 membership report the kernel sets the mrouters_only flag in a skb that may be a clone of the original skb, which means that sometimes the bridge loses track of membership report packets (cb buffers are tied to a specific skb and not shared) and it ends up forwading join requests to the bridge interface. This can cause unexpected membership timeouts and intermitent/permanent loss of connectivity as described in RFC 4541 [2.1.1. IGMP Forwarding Rules]: A snooping switch should forward IGMP Membership Reports only to those ports where multicast routers are attached. [...] Sending membership reports to other hosts can result, for IGMPv1 and IGMPv2, in unintentionally preventing a host from joining a specific multicast group. Signed-off-by: Fernando Luis Vazquez Cao Tested-by: Hayato Kakuta Signed-off-by: David S. Miller --- Reading git-diff-tree failed