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Date: Tue, 17 Feb 2015 03:19:24 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: Madhu Challa <challa@...ronetworks.com>,
David Miller <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Subject: [PATCH net-next] igmp: add __ip_mc_{join|leave}_group()
From: Eric Dumazet <edumazet@...gle.com>
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@...gle.com>
---
include/linux/igmp.h | 2 +
net/ipv4/igmp.c | 52 ++++++++++++++++++++++++++---------------
2 files changed, 36 insertions(+), 18 deletions(-)
diff --git a/include/linux/igmp.h b/include/linux/igmp.h
index 2c677afeea4782c96b79d0d8ede4846d87783b99..b5a6470e686c436f619ee086cbdfc3ece389db35 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 666cf364df86dffbab3cd2b7b1ea66e72d3ac7a8..4b1172d73e0309766d6d1a70473dd4c14d2c6fc0 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);
--
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