diff options
| author | Al Viro <viro@zeniv.linux.org.uk> | 2020-04-27 02:56:22 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-05-21 03:31:30 +0300 |
| commit | 2f984f11fdc06bcfd5bb528d07a93c20301dd068 (patch) | |
| tree | 6d0e66c255ae338b042aa173dc97b7f5bf4e0083 /net/ipv4/ip_sockglue.c | |
| parent | 168a2cca81438aef819e43feb161614488dee97b (diff) | |
| download | linux-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.c | 31 |
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: |