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authorLinus Lüssing <linus.luessing@c0d3.blue>2019-05-26 18:35:50 +0200
committerSimon Wunderlich <sw@simonwunderlich.de>2019-06-27 19:25:04 +0200
commit390dcd48cd1a53a81b68a87d0188e6aacc54a199 (patch)
treeaabced3760d843be484dfbe7b7291911a125364f /net/batman-adv
parentbatman-adv: mcast: collect softif listeners from IP lists instead (diff)
downloadlinux-dev-390dcd48cd1a53a81b68a87d0188e6aacc54a199.tar.xz
linux-dev-390dcd48cd1a53a81b68a87d0188e6aacc54a199.zip
batman-adv: mcast: avoid redundant multicast TT entries with bridges
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>
Diffstat (limited to 'net/batman-adv')
-rw-r--r--net/batman-adv/multicast.c33
1 files changed, 27 insertions, 6 deletions
diff --git a/net/batman-adv/multicast.c b/net/batman-adv/multicast.c
index ca9e2e67bdc6..d4e7474022e3 100644
--- a/net/batman-adv/multicast.c
+++ b/net/batman-adv/multicast.c
@@ -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))