bridge: Use IPv6 link-local address for multicast listener queries
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 <linus.luessing@web.de> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -445,7 +445,8 @@ static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
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ip6h->payload_len = htons(8 + sizeof(*mldq));
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ip6h->nexthdr = IPPROTO_HOPOPTS;
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ip6h->hop_limit = 1;
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ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
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ipv6_dev_get_saddr(dev_net(br->dev), br->dev, &ip6h->daddr, 0,
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&ip6h->saddr);
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ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
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ipv6_eth_mc_map(&ip6h->daddr, eth->h_dest);
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