From: Nikolay Borisov <n.bori...@siteground.com>
This was initially introduced in df2cf4a78e488d26 ("IGMP: Inhibit
reports for local multicast groups") by defining the sysctl in the
ipv4_net_table array, however it was never implemented to be
namespace aware. Fix this by changing the code accordingly.
---
v2:
Move definition of a local struct net var
inside ifdef to silence build warning
include/linux/igmp.h | 1 -
include/net/netns/ipv4.h | 1 +
net/ipv4/igmp.c | 26 +++++++++++++++-----------
net/ipv4/sysctl_net_ipv4.c | 2 +-
net/ipv4/tcp_ipv4.c | 2 ++
5 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/include/linux/igmp.h b/include/linux/igmp.h
index a91ec9f575e7..c683f4bf642b 100644
--- a/include/linux/igmp.h
+++ b/include/linux/igmp.h
@@ -37,7 +37,6 @@ static inline struct igmpv3_query *
return (struct igmpv3_query *)skb_transport_header(skb);
}
-extern int sysctl_igmp_llm_reports;
extern int sysctl_igmp_qrv;
struct ip_sf_socklist {
diff --git a/include/net/netns/ipv4.h b/include/net/netns/ipv4.h
index 522a2cfe1ad9..cbbf8115e8a7 100644
--- a/include/net/netns/ipv4.h
+++ b/include/net/netns/ipv4.h
@@ -110,6 +110,7 @@ struct netns_ipv4 {
int sysctl_igmp_max_memberships;
int sysctl_igmp_max_msf;
+ int sysctl_igmp_llm_reports;
struct ping_group_range ping_group_range;
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 6da2e467b63c..2e22ee0efc98 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -107,9 +107,6 @@
#include <linux/seq_file.h>
#endif
-/* 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 */
@@ -430,6 +427,7 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct
ip_mc_list *pmc,
int type, int gdeleted, int sdeleted)
{
struct net_device *dev = pmc->interface->dev;
+ struct net *net = dev_net(dev);
struct igmpv3_report *pih;
struct igmpv3_grec *pgr = NULL;
struct ip_sf_list *psf, *psf_next, *psf_prev, **psf_list;
@@ -437,7 +435,7 @@ 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)
+ if (ipv4_is_local_multicast(pmc->multiaddr) &&
!net->ipv4.sysctl_igmp_llm_reports)
return skb;
isquery = type == IGMPV3_MODE_IS_INCLUDE ||
@@ -540,6 +538,7 @@ empty_source:
static int igmpv3_send_report(struct in_device *in_dev, struct ip_mc_list *pmc)
{
struct sk_buff *skb = NULL;
+ struct net *net = dev_net(in_dev->dev);
int type;
if (!pmc) {
@@ -548,7 +547,7 @@ static int igmpv3_send_report(struct in_device *in_dev,
struct ip_mc_list *pmc)
if (pmc->multiaddr == IGMP_ALL_HOSTS)
continue;
if (ipv4_is_local_multicast(pmc->multiaddr) &&
- !sysctl_igmp_llm_reports)
+ !net->ipv4.sysctl_igmp_llm_reports)
continue;
spin_lock_bh(&pmc->lock);
if (pmc->sfcount[MCAST_EXCLUDE])
@@ -684,7 +683,7 @@ 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);
- if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
+ if (ipv4_is_local_multicast(group) &&
!net->ipv4.sysctl_igmp_llm_reports)
return 0;
if (type == IGMP_HOST_LEAVE_MESSAGE)
@@ -855,12 +854,13 @@ static int igmp_marksources(struct ip_mc_list *pmc, int
nsrcs, __be32 *srcs)
static bool igmp_heard_report(struct in_device *in_dev, __be32 group)
{
struct ip_mc_list *im;
+ struct net *net = dev_net(in_dev->dev);
/* Timers are only set for non-local groups */
if (group == IGMP_ALL_HOSTS)
return false;
- if (ipv4_is_local_multicast(group) && !sysctl_igmp_llm_reports)
+ if (ipv4_is_local_multicast(group) &&
!net->ipv4.sysctl_igmp_llm_reports)
return false;
rcu_read_lock();
@@ -884,6 +884,7 @@ static bool igmp_heard_query(struct in_device *in_dev,
struct sk_buff *skb,
__be32 group = ih->group;
int max_delay;
int mark = 0;
+ struct net *net = dev_net(in_dev->dev);
if (len == 8) {
@@ -969,7 +970,7 @@ static bool igmp_heard_query(struct in_device *in_dev,
struct sk_buff *skb,
if (im->multiaddr == IGMP_ALL_HOSTS)
continue;
if (ipv4_is_local_multicast(im->multiaddr) &&
- !sysctl_igmp_llm_reports)
+ !net->ipv4.sysctl_igmp_llm_reports)
continue;
spin_lock_bh(&im->lock);
if (im->tm_running)
@@ -1184,6 +1185,7 @@ static void igmp_group_dropped(struct ip_mc_list *im)
{
struct in_device *in_dev = im->interface;
#ifdef CONFIG_IP_MULTICAST
+ struct net *net = dev_net(in_dev->dev);
int reporter;
#endif
@@ -1195,7 +1197,7 @@ 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)
+ if (ipv4_is_local_multicast(im->multiaddr) &&
!net->ipv4.sysctl_igmp_llm_reports)
return;
reporter = im->reporter;
@@ -1220,6 +1222,7 @@ static void igmp_group_dropped(struct ip_mc_list *im)
static void igmp_group_added(struct ip_mc_list *im)
{
struct in_device *in_dev = im->interface;
+ struct net *net = dev_net(in_dev->dev);
if (im->loaded == 0) {
im->loaded = 1;
@@ -1229,7 +1232,7 @@ 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)
+ if (ipv4_is_local_multicast(im->multiaddr) &&
!net->ipv4.sysctl_igmp_llm_reports)
return;
if (in_dev->dead)
@@ -1530,6 +1533,7 @@ static void ip_mc_rejoin_groups(struct in_device *in_dev)
#ifdef CONFIG_IP_MULTICAST
struct ip_mc_list *im;
int type;
+ struct net *net = dev_net(in_dev->dev);
ASSERT_RTNL();
@@ -1537,7 +1541,7 @@ static void ip_mc_rejoin_groups(struct in_device *in_dev)
if (im->multiaddr == IGMP_ALL_HOSTS)
continue;
if (ipv4_is_local_multicast(im->multiaddr) &&
- !sysctl_igmp_llm_reports)
+ !net->ipv4.sysctl_igmp_llm_reports)
continue;
/* a failover is happening and switches
diff --git a/net/ipv4/sysctl_net_ipv4.c b/net/ipv4/sysctl_net_ipv4.c
index 225659a02cf2..fc40fa1303d3 100644
--- a/net/ipv4/sysctl_net_ipv4.c
+++ b/net/ipv4/sysctl_net_ipv4.c
@@ -852,7 +852,7 @@ static struct ctl_table ipv4_net_table[] = {
},
{
.procname = "igmp_link_local_mcast_reports",
- .data = &sysctl_igmp_llm_reports,
+ .data = &init_net.ipv4.sysctl_igmp_llm_reports,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = proc_dointvec
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index d0ac43b95378..5f30f9f6dfcf 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -2399,6 +2399,8 @@ static int __net_init tcp_sk_init(struct net *net)
net->ipv4.sysctl_igmp_max_memberships = 20;
net->ipv4.sysctl_igmp_max_msf = 10;
+ /* IGMP reports for link-local multicast groups are enabled by default
*/
+ net->ipv4.sysctl_igmp_llm_reports = 1;
return 0;
fail:
--
2.5.0
