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Diffstat (limited to 'net/ipv4/igmp.c')
-rw-r--r--net/ipv4/igmp.c26
1 files changed, 25 insertions, 1 deletions
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 9fdfd9deac11..d38b8b61eaee 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -110,6 +110,9 @@
#define IP_MAX_MEMBERSHIPS 20
#define IP_MAX_MSF 10
+/* IGMP reports for link-local multicast groups are enabled by default */
+int sysctl_igmp_llm_reports __read_mostly = 1;
+
#ifdef CONFIG_IP_MULTICAST
/* Parameter names and values are taken from igmp-v2-06 draft */
@@ -437,6 +440,8 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct ip_mc_list *pmc,
if (pmc->multiaddr == IGMP_ALL_HOSTS)
return skb;
+ if (ipv4_is_local_multicast(pmc->multiaddr) && !sysctl_igmp_llm_reports)
+ return skb;
isquery = type == IGMPV3_MODE_IS_INCLUDE ||
type == IGMPV3_MODE_IS_EXCLUDE;
@@ -545,6 +550,9 @@ static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
for_each_pmc_rcu(in_dev, pmc) {
if (pmc->multiaddr == IGMP_ALL_HOSTS)
continue;
+ if (ipv4_is_local_multicast(pmc->multiaddr) &&
+ !sysctl_igmp_llm_reports)
+ continue;
spin_lock_bh(&pmc->lock);
if (pmc->sfcount[MCAST_EXCLUDE])
type = IGMPV3_MODE_IS_EXCLUDE;
@@ -678,7 +686,11 @@ static int igmp_send_report(struct in_device *in_dev, struct ip_mc_list *pmc,
if (type == IGMPV3_HOST_MEMBERSHIP_REPORT)
return igmpv3_send_report(in_dev, pmc);
- else if (type == IGMP_HOST_LEAVE_MESSAGE)
+
+ if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
+ return 0;
+
+ if (type == IGMP_HOST_LEAVE_MESSAGE)
dst = IGMP_ALL_ROUTER;
else
dst = group;
@@ -851,6 +863,8 @@ static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
if (group == IGMP_ALL_HOSTS)
return false;
+ if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
+ return false;
rcu_read_lock();
for_each_pmc_rcu(in_dev, im) {
@@ -957,6 +971,9 @@ static bool igmp_heard_query(struct in_device *in_dev, struct sk_buff *skb,
continue;
if (im->multiaddr == IGMP_ALL_HOSTS)
continue;
+ if (ipv4_is_local_multicast(im->multiaddr) &&
+ !sysctl_igmp_llm_reports)
+ continue;
spin_lock_bh(&im->lock);
if (im->tm_running)
im->gsquery = im->gsquery && mark;
@@ -1181,6 +1198,8 @@ static void igmp_group_dropped(struct ip_mc_list *im)
#ifdef CONFIG_IP_MULTICAST
if (im->multiaddr == IGMP_ALL_HOSTS)
return;
+ if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
+ return;
reporter = im->reporter;
igmp_stop_timer(im);
@@ -1213,6 +1232,8 @@ static void igmp_group_added(struct ip_mc_list *im)
#ifdef CONFIG_IP_MULTICAST
if (im->multiaddr == IGMP_ALL_HOSTS)
return;
+ if (ipv4_is_local_multicast(im->multiaddr) && !sysctl_igmp_llm_reports)
+ return;
if (in_dev->dead)
return;
@@ -1518,6 +1539,9 @@ static void ip_mc_rejoin_groups(struct in_device *in_dev)
for_each_pmc_rtnl(in_dev, im) {
if (im->multiaddr == IGMP_ALL_HOSTS)
continue;
+ if (ipv4_is_local_multicast(im->multiaddr) &&
+ !sysctl_igmp_llm_reports)
+ continue;
/* a failover is happening and switches
* must be notified immediately