igmp: add __ip_mc_{join|leave}_group()

There is a need to perform igmp join/leave operations while RTNL is
held.

Make ip_mc_{join|leave}_group() wrappers around
__ip_mc_{join|leave}_group() to avoid the proliferation of work queues.

For example, vxlan_igmp_join() could possibly be removed.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 36 insertions, 18 deletions

diff --git a/include/linux/igmp.h b/include/linux/igmp.h
index 2c677afeea47..b5a6470e686c 100644
--- a/include/linux/igmp.h
+++ b/include/linux/igmp.h
@@ -111,7 +111,9 @@ struct ip_mc_list {
 
 extern int ip_check_mc_rcu(struct in_device *dev, __be32 mc_addr, __be32 src_addr, u16 proto);
 extern int igmp_rcv(struct sk_buff *);
+extern int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
 extern int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr);
+extern int __ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
 extern int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr);
 extern void ip_mc_drop_socket(struct sock *sk);
 extern int ip_mc_source(int add, int omode, struct sock *sk,
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index 666cf364df86..4b1172d73e03 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -1849,30 +1849,25 @@ static void ip_mc_clear_src(struct ip_mc_list *pmc)
         pmc->sfcount[MCAST_EXCLUDE] = 1;
 }
 
-
-/*
- * Join a multicast group
- */
-int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
+int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
 {
-        int err;
         __be32 addr = imr->imr_multiaddr.s_addr;
-        struct ip_mc_socklist *iml = NULL, *i;
+        struct ip_mc_socklist *iml, *i;
         struct in_device *in_dev;
         struct inet_sock *inet = inet_sk(sk);
         struct net *net = sock_net(sk);
         int ifindex;
         int count = 0;
+        int err;
+
+        ASSERT_RTNL();
 
         if (!ipv4_is_multicast(addr))
                 return -EINVAL;
 
-        rtnl_lock();
-
         in_dev = ip_mc_find_dev(net, imr);
 
         if (!in_dev) {
-                iml = NULL;
                 err = -ENODEV;
                 goto done;
         }
@@ -1900,9 +1895,22 @@ int ip_mc_join_group(struct sock *sk , struct ip_mreqn *imr)
         ip_mc_inc_group(in_dev, addr);
         err = 0;
 done:
-        rtnl_unlock();
         return err;
 }
+EXPORT_SYMBOL(__ip_mc_join_group);
+
+/* Join a multicast group
+ */
+int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
+{
+        int ret;
+
+        rtnl_lock();
+        ret = __ip_mc_join_group(sk, imr);
+        rtnl_unlock();
+
+        return ret;
+}
 EXPORT_SYMBOL(ip_mc_join_group);
 
 static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
@@ -1925,11 +1933,7 @@ static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
         return err;
 }
 
-/*
- *      Ask a socket to leave a group.
- */
-
-int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
+int __ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
 {
         struct inet_sock *inet = inet_sk(sk);
         struct ip_mc_socklist *iml;
@@ -1940,7 +1944,8 @@ int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
         u32 ifindex;
         int ret = -EADDRNOTAVAIL;
 
-        rtnl_lock();
+        ASSERT_RTNL();
+
         in_dev = ip_mc_find_dev(net, imr);
         if (!in_dev) {
                 ret = -ENODEV;
@@ -1964,14 +1969,25 @@ int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
                 *imlp = iml->next_rcu;
 
                 ip_mc_dec_group(in_dev, group);
-                rtnl_unlock();
+
                 /* decrease mem now to avoid the memleak warning */
                 atomic_sub(sizeof(*iml), &sk->sk_omem_alloc);
                 kfree_rcu(iml, rcu);
                 return 0;
         }
 out:
+        return ret;
+}
+EXPORT_SYMBOL(__ip_mc_leave_group);
+
+int ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
+{
+        int ret;
+
+        rtnl_lock();
+        ret = __ip_mc_leave_group(sk, imr);
         rtnl_unlock();
+
         return ret;
 }
 EXPORT_SYMBOL(ip_mc_leave_group);