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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>
This commit is contained in:
Al Viro 2020-04-27 11:37:02 -04:00
parent fcfa0b09d3
commit b212c322c8
2 changed files with 42 additions and 4 deletions
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23
net/ipv4/ip_sockglue.c
View File

@ -1322,8 +1322,27 @@ int compat_ip_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,
ip_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_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);

23
net/ipv6/ipv6_sockglue.c
View File

@ -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);