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net/ipv6: factor out mcast join/leave setsockopt helpers

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Factor out one helper each for setting the native and compat
version of the MCAST_MSFILTER option.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-07-17 08:23:29 +02:00 committed by David S. Miller
parent ca0e65eb29
commit fdf5bdd87c
1 changed files with 53 additions and 50 deletions
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103
net/ipv6/ipv6_sockglue.c
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@ -252,6 +252,56 @@ static int compat_ipv6_set_mcast_msfilter(struct sock *sk, void __user *optval,
}
#endif
static int ipv6_mcast_join_leave(struct sock *sk, int optname,
void __user *optval, int optlen)
{
struct sockaddr_in6 *psin6;
struct group_req greq;
if (optlen < sizeof(greq))
return -EINVAL;
if (copy_from_user(&greq, optval, sizeof(greq)))
return -EFAULT;
if (greq.gr_group.ss_family != AF_INET6)
return -EADDRNOTAVAIL;
psin6 = (struct sockaddr_in6 *)&greq.gr_group;
if (optname == MCAST_JOIN_GROUP)
return ipv6_sock_mc_join(sk, greq.gr_interface,
&psin6->sin6_addr);
return ipv6_sock_mc_drop(sk, greq.gr_interface, &psin6->sin6_addr);
}
#ifdef CONFIG_COMPAT
static int compat_ipv6_mcast_join_leave(struct sock *sk, int optname,
void __user *optval, int optlen)
{
struct compat_group_req gr32;
struct sockaddr_in6 *psin6;
int err;
if (optlen < sizeof(gr32))
return -EINVAL;
if (copy_from_user(&gr32, optval, sizeof(gr32)))
return -EFAULT;
if (gr32.gr_group.ss_family != AF_INET6)
return -EADDRNOTAVAIL;
rtnl_lock();
lock_sock(sk);
psin6 = (struct sockaddr_in6 *)&gr32.gr_group;
if (optname == MCAST_JOIN_GROUP)
err = ipv6_sock_mc_join(sk, gr32.gr_interface,
&psin6->sin6_addr);
else
err = ipv6_sock_mc_drop(sk, gr32.gr_interface,
&psin6->sin6_addr);
release_sock(sk);
rtnl_unlock();
return err;
}
#endif
static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
char __user *optval, unsigned int optlen)
{
@ -803,29 +853,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
case MCAST_JOIN_GROUP:
case MCAST_LEAVE_GROUP:
{
struct group_req greq;
struct sockaddr_in6 *psin6;
if (optlen < sizeof(struct group_req))
goto e_inval;
retv = -EFAULT;
if (copy_from_user(&greq, optval, sizeof(struct group_req)))
break;
if (greq.gr_group.ss_family != AF_INET6) {
retv = -EADDRNOTAVAIL;
break;
}
psin6 = (struct sockaddr_in6 *)&greq.gr_group;
if (optname == MCAST_JOIN_GROUP)
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_mcast_join_leave(sk, optname, optval, optlen);
break;
}
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE:
@ -975,34 +1004,8 @@ int compat_ipv6_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_in6 *psin6 = (struct sockaddr_in6 *)&greq.gr_group;
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 (greq.gr_group.ss_family != AF_INET6)
return -EADDRNOTAVAIL;
rtnl_lock();
lock_sock(sk);
if (optname == MCAST_JOIN_GROUP)
err = ipv6_sock_mc_join(sk, greq.gr_interface,
&psin6->sin6_addr);
else
err = ipv6_sock_mc_drop(sk, greq.gr_interface,
&psin6->sin6_addr);
release_sock(sk);
rtnl_unlock();
return err;
}
return compat_ipv6_mcast_join_leave(sk, optname, optval,
optlen);
case MCAST_JOIN_SOURCE_GROUP:
case MCAST_LEAVE_SOURCE_GROUP:
case MCAST_BLOCK_SOURCE: