netconf: advertise mc_forwarding status

This patch advertise the MC_FORWARDING status for IPv4 and IPv6.
This field is readonly, only multicast engine in the kernel updates it.

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 26 insertions, 4 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 22ae75d54017..28e0e627229c 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -469,6 +469,8 @@ static int inet6_netconf_msgsize_devconf(int type)
         /* type -1 is used for ALL */
         if (type == -1 || type == NETCONFA_FORWARDING)
                 size += nla_total_size(4);
+        if (type == -1 || type == NETCONFA_MC_FORWARDING)
+                size += nla_total_size(4);
 
         return size;
 }
@@ -496,6 +498,10 @@ static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
         if ((type == -1 || type == NETCONFA_FORWARDING) &&
             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
                 goto nla_put_failure;
+        if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
+            nla_put_s32(skb, NETCONFA_MC_FORWARDING,
+                        devconf->mc_forwarding) < 0)
+                goto nla_put_failure;
 
         return nlmsg_end(skb, nlh);
 
@@ -504,8 +510,8 @@ nla_put_failure:
         return -EMSGSIZE;
 }
 
-static void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
-                                         struct ipv6_devconf *devconf)
+void inet6_netconf_notify_devconf(struct net *net, int type, int ifindex,
+                                  struct ipv6_devconf *devconf)
 {
         struct sk_buff *skb;
         int err = -ENOBUFS;
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 926ea544f499..1c05fe604d37 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -52,6 +52,7 @@
 #include <linux/netfilter_ipv6.h>
 #include <linux/export.h>
 #include <net/ip6_checksum.h>
+#include <linux/netconf.h>
 
 struct mr6_table {
         struct list_head        list;
@@ -805,8 +806,12 @@ static int mif6_delete(struct mr6_table *mrt, int vifi, struct list_head *head)
         dev_set_allmulti(dev, -1);
 
         in6_dev = __in6_dev_get(dev);
-        if (in6_dev)
+        if (in6_dev) {
                 in6_dev->cnf.mc_forwarding--;
+                inet6_netconf_notify_devconf(dev_net(dev),
+                                             NETCONFA_MC_FORWARDING,
+                                             dev->ifindex, &in6_dev->cnf);
+        }
 
         if (v->flags & MIFF_REGISTER)
                 unregister_netdevice_queue(dev, head);
@@ -958,8 +963,12 @@ static int mif6_add(struct net *net, struct mr6_table *mrt,
         }
 
         in6_dev = __in6_dev_get(dev);
-        if (in6_dev)
+        if (in6_dev) {
                 in6_dev->cnf.mc_forwarding++;
+                inet6_netconf_notify_devconf(dev_net(dev),
+                                             NETCONFA_MC_FORWARDING,
+                                             dev->ifindex, &in6_dev->cnf);
+        }
 
         /*
          *      Fill in the VIF structures
@@ -1513,6 +1522,9 @@ static int ip6mr_sk_init(struct mr6_table *mrt, struct sock *sk)
         if (likely(mrt->mroute6_sk == NULL)) {
                 mrt->mroute6_sk = sk;
                 net->ipv6.devconf_all->mc_forwarding++;
+                inet6_netconf_notify_devconf(net, NETCONFA_MC_FORWARDING,
+                                             NETCONFA_IFINDEX_ALL,
+                                             net->ipv6.devconf_all);
         }
         else
                 err = -EADDRINUSE;
@@ -1535,6 +1547,10 @@ int ip6mr_sk_done(struct sock *sk)
                         write_lock_bh(&mrt_lock);
                         mrt->mroute6_sk = NULL;
                         net->ipv6.devconf_all->mc_forwarding--;
+                        inet6_netconf_notify_devconf(net,
+                                                     NETCONFA_MC_FORWARDING,
+                                                     NETCONFA_IFINDEX_ALL,
+                                                     net->ipv6.devconf_all);
                         write_unlock_bh(&mrt_lock);
 
                         mroute_clean_tables(mrt);