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batman-adv: mcast: avoid redundant multicast TT entries with bridges

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When a bridge is added on top of bat0 we set the WANT_ALL_UNSNOOPABLES
flag. Which means we sign up for all traffic for ff02::1/128 and
224.0.0.0/24.

When the node itself had IPv6 enabled or joined a group in 224.0.0.0/24
itself then so far this would result in a multicast TT entry which is
redundant to the WANT_ALL_UNSNOOPABLES.

With this patch such redundant TT entries are avoided.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Signed-off-by: Simon Wunderlich <sw@simonwunderlich.de>
This commit is contained in:
Linus Lüssing 2019-05-26 18:35:50 +02:00 committed by Simon Wunderlich
parent 5c506802ca
commit 390dcd48cd
1 changed files with 27 additions and 6 deletions
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33
net/batman-adv/multicast.c
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@ -230,6 +230,10 @@ batadv_mcast_mla_softif_get_ipv4(struct net_device *dev,
for (pmc = rcu_dereference(in_dev->mc_list); pmc;
pmc = rcu_dereference(pmc->next_rcu)) {
if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv4_is_local_multicast(pmc->multiaddr))
continue;
ip_eth_mc_map(pmc->multiaddr, mcast_addr);
if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
@ -293,6 +297,10 @@ batadv_mcast_mla_softif_get_ipv6(struct net_device *dev,
IPV6_ADDR_SCOPE_LINKLOCAL)
continue;
if (flags->tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv6_addr_is_ll_all_nodes(&pmc6->mca_addr))
continue;
ipv6_eth_mc_map(&pmc6->mca_addr, mcast_addr);
if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))
@ -413,9 +421,8 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev,
struct batadv_mcast_mla_flags *flags)
{
struct list_head bridge_mcast_list = LIST_HEAD_INIT(bridge_mcast_list);
bool all_ipv4 = flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4;
bool all_ipv6 = flags->tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6;
struct br_ip_list *br_ip_entry, *tmp;
u8 tvlv_flags = flags->tvlv_flags;
struct batadv_hw_addr *new;
u8 mcast_addr[ETH_ALEN];
int ret;
@ -428,11 +435,25 @@ static int batadv_mcast_mla_bridge_get(struct net_device *dev,
goto out;
list_for_each_entry(br_ip_entry, &bridge_mcast_list, list) {
if (all_ipv4 && br_ip_entry->addr.proto == htons(ETH_P_IP))
continue;
if (br_ip_entry->addr.proto == htons(ETH_P_IP)) {
if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV4)
continue;
if (all_ipv6 && br_ip_entry->addr.proto == htons(ETH_P_IPV6))
continue;
if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv4_is_local_multicast(br_ip_entry->addr.u.ip4))
continue;
}
#if IS_ENABLED(CONFIG_IPV6)
if (br_ip_entry->addr.proto == htons(ETH_P_IPV6)) {
if (tvlv_flags & BATADV_MCAST_WANT_ALL_IPV6)
continue;
if (tvlv_flags & BATADV_MCAST_WANT_ALL_UNSNOOPABLES &&
ipv6_addr_is_ll_all_nodes(&br_ip_entry->addr.u.ip6))
continue;
}
#endif
batadv_mcast_mla_br_addr_cpy(mcast_addr, &br_ip_entry->addr);
if (batadv_mcast_mla_is_duplicate(mcast_addr, mcast_list))