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| author | Al Viro <viro@zeniv.linux.org.uk> | 2020-04-27 18:37:02 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-05-21 03:31:32 +0300 |
| commit | b212c322c8d73c48062340dc4cbe150c4ce97fb8 (patch) | |
| tree | 272780e6e031ecfa31201677c4789b240646a643 /net/ipv6 | |
| parent | fcfa0b09d3f794af66cf8bcee03ddb7055934742 (diff) | |
| download | linux-b212c322c8d73c48062340dc4cbe150c4ce97fb8.tar.xz | |
handle the group_source_req options directly
Native ->setsockopt() handling of these options (MCAST_..._SOURCE_GROUP
and MCAST_{,UN}BLOCK_SOURCE) consists of copyin + call of a helper that
does the actual work. The only change needed for ->compat_setsockopt()
is a slightly different copyin - the helpers can be reused as-is.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/ipv6_sockglue.c | 23 |
1 files changed, 21 insertions, 2 deletions
diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index bb049feeb787..e10258c2210e 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -1015,8 +1015,27 @@ int compat_ipv6_setsockopt(struct sock *sk, int level, int optname, case MCAST_LEAVE_SOURCE_GROUP: case MCAST_BLOCK_SOURCE: case MCAST_UNBLOCK_SOURCE: - return compat_mc_setsockopt(sk, level, optname, optval, optlen, - ipv6_setsockopt); + { + struct compat_group_source_req __user *gsr32 = (void __user *)optval; + struct group_source_req greqs; + + if (optlen < sizeof(struct compat_group_source_req)) + return -EINVAL; + + if (get_user(greqs.gsr_interface, &gsr32->gsr_interface) || + copy_from_user(&greqs.gsr_group, &gsr32->gsr_group, + sizeof(greqs.gsr_group)) || + copy_from_user(&greqs.gsr_source, &gsr32->gsr_source, + sizeof(greqs.gsr_source))) + return -EFAULT; + + rtnl_lock(); + lock_sock(sk); + err = do_ipv6_mcast_group_source(sk, optname, &greqs); + release_sock(sk); + rtnl_unlock(); + return err; + } case MCAST_MSFILTER: { const int size0 = offsetof(struct compat_group_filter, gf_slist); |