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authorAl Viro <viro@zeniv.linux.org.uk>2020-04-27 02:56:22 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2020-05-21 03:31:30 +0300
commit2f984f11fdc06bcfd5bb528d07a93c20301dd068 (patch)
tree6d0e66c255ae338b042aa173dc97b7f5bf4e0083 /net/ipv4/ip_sockglue.c
parent168a2cca81438aef819e43feb161614488dee97b (diff)
downloadlinux-2f984f11fdc06bcfd5bb528d07a93c20301dd068.tar.xz
ipv[46]: do compat setsockopt for MCAST_{JOIN,LEAVE}_GROUP directly
direct parallel to the way these two are handled in the native ->setsockopt() instances - the helpers that do the real work are already separated and can be reused as-is in this case. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/ipv4/ip_sockglue.c')
-rw-r--r--net/ipv4/ip_sockglue.c31
1 files changed, 31 insertions, 0 deletions
diff --git a/net/ipv4/ip_sockglue.c b/net/ipv4/ip_sockglue.c
index b6b889b5dacf..34c3a43a9c98 100644
--- a/net/ipv4/ip_sockglue.c
+++ b/net/ipv4/ip_sockglue.c
@@ -1282,6 +1282,37 @@ int compat_ip_setsockopt(struct sock *sk, int level, int optname,
switch (optname) {
case MCAST_JOIN_GROUP:
case MCAST_LEAVE_GROUP:
+ {
+ struct compat_group_req __user *gr32 = (void __user *)optval;
+ struct group_req greq;
+ struct sockaddr_in *psin = (struct sockaddr_in *)&greq.gr_group;
+ struct ip_mreqn mreq;
+
+ if (optlen < sizeof(struct compat_group_req))
+ return -EINVAL;
+
+ if (get_user(greq.gr_interface, &gr32->gr_interface) ||
+ copy_from_user(&greq.gr_group, &gr32->gr_group,
+ sizeof(greq.gr_group)))
+ return -EFAULT;
+
+ if (psin->sin_family != AF_INET)
+ return -EINVAL;
+
+ memset(&mreq, 0, sizeof(mreq));
+ mreq.imr_multiaddr = psin->sin_addr;
+ mreq.imr_ifindex = greq.gr_interface;
+
+ rtnl_lock();
+ lock_sock(sk);
+ if (optname == MCAST_JOIN_GROUP)
+ err = ip_mc_join_group(sk, &mreq);
+ else
+ err = ip_mc_leave_group(sk, &mreq);
+ release_sock(sk);
+ rtnl_unlock();
+ return err;
+ }
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE: