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ipv4, ipv6: kill ip_mc_{join, leave}_group and ipv6_sock_mc_{join, drop}

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in favor of their inner __ ones, which doesn't grab rtnl.

As these functions need to operate on a locked socket, we can't be
grabbing rtnl by then. It's too late and doing so causes reversed
locking.

So this patch:
- move rtnl handling to callers instead while already fixing some
  reversed locking situations, like on vxlan and ipvs code.
- renames __ ones to not have the __ mark:
  __ip_mc_{join,leave}_group -> ip_mc_{join,leave}_group
  __ipv6_sock_mc_{join,drop} -> ipv6_sock_mc_{join,drop}

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Marcelo Ricardo Leitner 2015-03-18 14:50:43 -03:00 committed by David S. Miller
parent baf606d9c9
commit 54ff9ef36b
11 changed files with 51 additions and 87 deletions
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5
drivers/net/vxlan.c
View file

@ -1097,7 +1097,6 @@ EXPORT_SYMBOL_GPL(vxlan_sock_release);
/* Callback to update multicast group membership when first VNI on
* multicast asddress is brought up
* Done as workqueue because ip_mc_join_group acquires RTNL.
*/
static void vxlan_igmp_join(struct work_struct *work)
{
@ -1107,6 +1106,7 @@ static void vxlan_igmp_join(struct work_struct *work)
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
int ifindex = vxlan->default_dst.remote_ifindex;
rtnl_lock();
lock_sock(sk);
if (ip->sa.sa_family == AF_INET) {
struct ip_mreqn mreq = {
@ -1122,6 +1122,7 @@ static void vxlan_igmp_join(struct work_struct *work)
#endif
}
release_sock(sk);
rtnl_unlock();
vxlan_sock_release(vs);
dev_put(vxlan->dev);
@ -1136,6 +1137,7 @@ static void vxlan_igmp_leave(struct work_struct *work)
union vxlan_addr *ip = &vxlan->default_dst.remote_ip;
int ifindex = vxlan->default_dst.remote_ifindex;
rtnl_lock();
lock_sock(sk);
if (ip->sa.sa_family == AF_INET) {
struct ip_mreqn mreq = {
@ -1152,6 +1154,7 @@ static void vxlan_igmp_leave(struct work_struct *work)
}
release_sock(sk);
rtnl_unlock();
vxlan_sock_release(vs);
dev_put(vxlan->dev);

2
include/linux/igmp.h
View file

@ -111,9 +111,7 @@ 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,

4
include/net/ipv6.h
View file

@ -942,10 +942,6 @@ void ipv6_sysctl_unregister(void);
int ipv6_sock_mc_join(struct sock *sk, int ifindex,
const struct in6_addr *addr);
int __ipv6_sock_mc_join(struct sock *sk, int ifindex,
const struct in6_addr *addr);
int ipv6_sock_mc_drop(struct sock *sk, int ifindex,
const struct in6_addr *addr);
int __ipv6_sock_mc_drop(struct sock *sk, int ifindex,
const struct in6_addr *addr);
#endif /* _NET_IPV6_H */

4
net/ipv4/devinet.c
View file

@ -560,9 +560,9 @@ static int ip_mc_config(struct sock *sk, bool join, const struct in_ifaddr *ifa)
lock_sock(sk);
if (join)
ret = __ip_mc_join_group(sk, &mreq);
ret = ip_mc_join_group(sk, &mreq);
else
ret = __ip_mc_leave_group(sk, &mreq);
ret = ip_mc_leave_group(sk, &mreq);
release_sock(sk);
return ret;

41
net/ipv4/igmp.c
View file

@ -1850,7 +1850,10 @@ static void ip_mc_clear_src(struct ip_mc_list *pmc)
pmc->sfcount[MCAST_EXCLUDE] = 1;
}
int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
/* Join a multicast group
*/
int ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
{
__be32 addr = imr->imr_multiaddr.s_addr;
struct ip_mc_socklist *iml, *i;
@ -1898,20 +1901,6 @@ int __ip_mc_join_group(struct sock *sk, struct ip_mreqn *imr)
done:
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,
@ -1934,7 +1923,7 @@ static int ip_mc_leave_src(struct sock *sk, struct ip_mc_socklist *iml,
return err;
}
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;
@ -1979,18 +1968,6 @@ int __ip_mc_leave_group(struct sock *sk, struct ip_mreqn *imr)
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);
int ip_mc_source(int add, int omode, struct sock *sk, struct
@ -2010,7 +1987,7 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct
if (!ipv4_is_multicast(addr))
return -EINVAL;
rtnl_lock();
ASSERT_RTNL();
imr.imr_multiaddr.s_addr = mreqs->imr_multiaddr;
imr.imr_address.s_addr = mreqs->imr_interface;
@ -2124,9 +2101,8 @@ int ip_mc_source(int add, int omode, struct sock *sk, struct
ip_mc_add_src(in_dev, &mreqs->imr_multiaddr, omode, 1,
&mreqs->imr_sourceaddr, 1);
done:
rtnl_unlock();
if (leavegroup)
return ip_mc_leave_group(sk, &imr);
err = ip_mc_leave_group(sk, &imr);
return err;
}
@ -2148,7 +2124,7 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
msf->imsf_fmode != MCAST_EXCLUDE)
return -EINVAL;
rtnl_lock();
ASSERT_RTNL();
imr.imr_multiaddr.s_addr = msf->imsf_multiaddr;
imr.imr_address.s_addr = msf->imsf_interface;
@ -2210,7 +2186,6 @@ int ip_mc_msfilter(struct sock *sk, struct ip_msfilter *msf, int ifindex)
pmc->sfmode = msf->imsf_fmode;
err = 0;
done:
rtnl_unlock();
if (leavegroup)
err = ip_mc_leave_group(sk, &imr);
return err;

21
net/ipv4/ip_sockglue.c
View file

@ -541,9 +541,18 @@ static bool setsockopt_needs_rtnl(int optname)
switch (optname) {
case IP_ADD_MEMBERSHIP:
case IP_ADD_SOURCE_MEMBERSHIP:
case IP_BLOCK_SOURCE:
case IP_DROP_MEMBERSHIP:
case IP_DROP_SOURCE_MEMBERSHIP:
case IP_MSFILTER:
case IP_UNBLOCK_SOURCE:
case MCAST_BLOCK_SOURCE:
case MCAST_MSFILTER:
case MCAST_JOIN_GROUP:
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_UNBLOCK_SOURCE:
return true;
}
return false;
@ -861,9 +870,9 @@ static int do_ip_setsockopt(struct sock *sk, int level,
}
if (optname == IP_ADD_MEMBERSHIP)
err = __ip_mc_join_group(sk, &mreq);
err = ip_mc_join_group(sk, &mreq);
else
err = __ip_mc_leave_group(sk, &mreq);
err = ip_mc_leave_group(sk, &mreq);
break;
}
case IP_MSFILTER:
@ -928,7 +937,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
mreq.imr_multiaddr.s_addr = mreqs.imr_multiaddr;
mreq.imr_address.s_addr = mreqs.imr_interface;
mreq.imr_ifindex = 0;
err = __ip_mc_join_group(sk, &mreq);
err = ip_mc_join_group(sk, &mreq);
if (err && err != -EADDRINUSE)
break;
omode = MCAST_INCLUDE;
@ -960,9 +969,9 @@ static int do_ip_setsockopt(struct sock *sk, int level,
mreq.imr_ifindex = greq.gr_interface;
if (optname == MCAST_JOIN_GROUP)
err = __ip_mc_join_group(sk, &mreq);
err = ip_mc_join_group(sk, &mreq);
else
err = __ip_mc_leave_group(sk, &mreq);
err = ip_mc_leave_group(sk, &mreq);
break;
}
case MCAST_JOIN_SOURCE_GROUP:
@ -1005,7 +1014,7 @@ static int do_ip_setsockopt(struct sock *sk, int level,
mreq.imr_multiaddr = psin->sin_addr;
mreq.imr_address.s_addr = 0;
mreq.imr_ifindex = greqs.gsr_interface;
err = __ip_mc_join_group(sk, &mreq);
err = ip_mc_join_group(sk, &mreq);
if (err && err != -EADDRINUSE)
break;
greqs.gsr_interface = mreq.imr_ifindex;

4
net/ipv6/addrconf.c
View file

@ -2473,9 +2473,9 @@ static int ipv6_mc_config(struct sock *sk, bool join,
lock_sock(sk);
if (join)
ret = __ipv6_sock_mc_join(sk, ifindex, addr);
ret = ipv6_sock_mc_join(sk, ifindex, addr);
else
ret = __ipv6_sock_mc_drop(sk, ifindex, addr);
ret = ipv6_sock_mc_drop(sk, ifindex, addr);
release_sock(sk);
return ret;

21
net/ipv6/ipv6_sockglue.c
View file

@ -124,6 +124,11 @@ static bool setsockopt_needs_rtnl(int optname)
case IPV6_DROP_MEMBERSHIP:
case MCAST_JOIN_GROUP:
case MCAST_LEAVE_GROUP:
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE:
case MCAST_UNBLOCK_SOURCE:
case MCAST_MSFILTER:
return true;
}
return false;
@ -597,9 +602,9 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
break;
if (optname == IPV6_ADD_MEMBERSHIP)
retv = __ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
retv = ipv6_sock_mc_join(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
else
retv = __ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
retv = ipv6_sock_mc_drop(sk, mreq.ipv6mr_ifindex, &mreq.ipv6mr_multiaddr);
break;
}
case IPV6_JOIN_ANYCAST:
@ -638,11 +643,11 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
}
psin6 = (struct sockaddr_in6 *)&greq.gr_group;
if (optname == MCAST_JOIN_GROUP)
retv = __ipv6_sock_mc_join(sk, greq.gr_interface,
&psin6->sin6_addr);
retv = ipv6_sock_mc_join(sk, greq.gr_interface,
&psin6->sin6_addr);
else
retv = __ipv6_sock_mc_drop(sk, greq.gr_interface,
&psin6->sin6_addr);
retv = ipv6_sock_mc_drop(sk, greq.gr_interface,
&psin6->sin6_addr);
break;
}
case MCAST_JOIN_SOURCE_GROUP:
@ -674,8 +679,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
struct sockaddr_in6 *psin6;
psin6 = (struct sockaddr_in6 *)&greqs.gsr_group;
retv = __ipv6_sock_mc_join(sk, greqs.gsr_interface,
&psin6->sin6_addr);
retv = ipv6_sock_mc_join(sk, greqs.gsr_interface,
&psin6->sin6_addr);
/* prior join w/ different source is ok */
if (retv && retv != -EADDRINUSE)
break;

30
net/ipv6/mcast.c
View file

@ -132,7 +132,7 @@ static int unsolicited_report_interval(struct inet6_dev *idev)
return iv > 0 ? iv : 1;
}
int __ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
struct net_device *dev = NULL;
struct ipv6_mc_socklist *mc_lst;
@ -199,24 +199,12 @@ int __ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *add
return 0;
}
EXPORT_SYMBOL(__ipv6_sock_mc_join);
int ipv6_sock_mc_join(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
int ret;
rtnl_lock();
ret = __ipv6_sock_mc_join(sk, ifindex, addr);
rtnl_unlock();
return ret;
}
EXPORT_SYMBOL(ipv6_sock_mc_join);
/*
* socket leave on multicast group
*/
int __ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
struct ipv6_pinfo *np = inet6_sk(sk);
struct ipv6_mc_socklist *mc_lst;
@ -255,18 +243,6 @@ int __ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *add
return -EADDRNOTAVAIL;
}
EXPORT_SYMBOL(__ipv6_sock_mc_drop);
int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
{
int ret;
rtnl_lock();
ret = __ipv6_sock_mc_drop(sk, ifindex, addr);
rtnl_unlock();
return ret;
}
EXPORT_SYMBOL(ipv6_sock_mc_drop);
/* called with rcu_read_lock() */
@ -460,7 +436,7 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
read_unlock_bh(&idev->lock);
rcu_read_unlock();
if (leavegroup)
return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
err = ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
return err;
}

2
net/netfilter/ipvs/ip_vs_sync.c
View file

@ -1405,9 +1405,11 @@ join_mcast_group(struct sock *sk, struct in_addr *addr, char *ifname)
mreq.imr_ifindex = dev->ifindex;
rtnl_lock();
lock_sock(sk);
ret = ip_mc_join_group(sk, &mreq);
release_sock(sk);
rtnl_unlock();
return ret;
}

4
net/tipc/udp_media.c
View file

@ -246,11 +246,11 @@ static int enable_mcast(struct udp_bearer *ub, struct udp_media_addr *remote)
return 0;
mreqn.imr_multiaddr = remote->ipv4;
mreqn.imr_ifindex = ub->ifindex;
err = __ip_mc_join_group(sk, &mreqn);
err = ip_mc_join_group(sk, &mreqn);
} else {
if (!ipv6_addr_is_multicast(&remote->ipv6))
return 0;
err = __ipv6_sock_mc_join(sk, ub->ifindex, &remote->ipv6);
err = ipv6_sock_mc_join(sk, ub->ifindex, &remote->ipv6);
}
return err;
}