From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?UTF-8?q?Linus=20L=C3=BCssing?= Date: Thu, 17 Feb 2011 19:17:52 +0100 Message-Id: <1297966672-3457-3-git-send-email-linus.luessing@web.de> In-Reply-To: <20110215154128.2a28632c@nehalam> References: <20110215154128.2a28632c@nehalam> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linus.luessing@web.de Subject: [Bridge] [PATCH 2/2] bridge: Use IPv6 link-local address for multicast listener queries List-Id: Linux Ethernet Bridging List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stephen Hemminger , "David S. Miller" , bridge@lists.linux-foundation.org Cc: YOSHIFUJI Hideaki , netdev@vger.kernel.org, =?UTF-8?q?Linus=20L=C3=BCssing?= , linux-kernel@vger.kernel.org, Herbert Xu Currently the bridge multicast snooping feature periodically issues IPv6 general multicast listener queries to sense the absence of a listener. For this, it uses :: as its source address - however RFC 2710 requires: "To be valid, the Query message MUST come from a link-local IPv6 Source Address". Current Linux kernel versions seem to follow this requirement and ignore our bogus MLD queries. With this commit a link local address from the bridge interface is being used to issue the MLD query, resulting in other Linux devices which are multicast listeners in the network to respond with a MLD response (which was not the case before). Signed-off-by: Linus Lüssing --- net/bridge/br_multicast.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-) diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c index f904a2e..2d88861 100644 --- a/net/bridge/br_multicast.c +++ b/net/bridge/br_multicast.c @@ -446,7 +446,8 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br, ip6h->payload_len = htons(8 + sizeof(*mldq)); ip6h->nexthdr = IPPROTO_HOPOPTS; ip6h->hop_limit = 1; - ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0); + ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0, + &ip6h->saddr); ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1)); ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest); -- 1.7.2.3