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net/ipv4: factor out MCAST_MSFILTER getsockopt helpers 

Factor out one helper each for getting 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 08:23:23 +02:00 committed by David S. Miller
parent 657e4c34a2
commit 49e74c24f3
1 changed files with 70 additions and 61 deletions
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131
net/ipv4/ip_sockglue.c
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@ -1468,6 +1468,74 @@ static bool getsockopt_needs_rtnl(int optname)
return false;
}
static int ip_get_mcast_msfilter(struct sock *sk, void __user *optval,
int __user *optlen, int len)
{
const int size0 = offsetof(struct group_filter, gf_slist);
struct group_filter __user *p = optval;
struct group_filter gsf;
int num;
int err;
if (len < size0)
return -EINVAL;
if (copy_from_user(&gsf, p, size0))
return -EFAULT;
num = gsf.gf_numsrc;
err = ip_mc_gsfget(sk, &gsf, p->gf_slist);
if (err)
return err;
if (gsf.gf_numsrc < num)
num = gsf.gf_numsrc;
if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
copy_to_user(p, &gsf, size0))
return -EFAULT;
return 0;
}
#ifdef CONFIG_COMPAT
static int compat_ip_get_mcast_msfilter(struct sock *sk, void __user *optval,
int __user *optlen)
{
const int size0 = offsetof(struct compat_group_filter, gf_slist);
struct compat_group_filter __user *p = optval;
struct compat_group_filter gf32;
struct group_filter gf;
int len, err;
int num;
if (get_user(len, optlen))
return -EFAULT;
if (len < size0)
return -EINVAL;
if (copy_from_user(&gf32, p, size0))
return -EFAULT;
gf.gf_interface = gf32.gf_interface;
gf.gf_fmode = gf32.gf_fmode;
num = gf.gf_numsrc = gf32.gf_numsrc;
gf.gf_group = gf32.gf_group;
rtnl_lock();
lock_sock(sk);
err = ip_mc_gsfget(sk, &gf, p->gf_slist);
release_sock(sk);
rtnl_unlock();
if (err)
return err;
if (gf.gf_numsrc < num)
num = gf.gf_numsrc;
len = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
if (put_user(len, optlen) ||
put_user(gf.gf_fmode, &p->gf_fmode) ||
put_user(gf.gf_numsrc, &p->gf_numsrc))
return -EFAULT;
return 0;
}
#endif
static int do_ip_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen, unsigned int flags)
{
@ -1626,31 +1694,8 @@ static int do_ip_getsockopt(struct sock *sk, int level, int optname,
goto out;
}
case MCAST_MSFILTER:
{
struct group_filter __user *p = (void __user *)optval;
struct group_filter gsf;
const int size0 = offsetof(struct group_filter, gf_slist);
int num;
if (len < size0) {
err = -EINVAL;
goto out;
}
if (copy_from_user(&gsf, p, size0)) {
err = -EFAULT;
goto out;
}
num = gsf.gf_numsrc;
err = ip_mc_gsfget(sk, &gsf, p->gf_slist);
if (err)
goto out;
if (gsf.gf_numsrc < num)
num = gsf.gf_numsrc;
if (put_user(GROUP_FILTER_SIZE(num), optlen) ||
copy_to_user(p, &gsf, size0))
err = -EFAULT;
err = ip_get_mcast_msfilter(sk, optval, optlen, len);
goto out;
}
case IP_MULTICAST_ALL:
val = inet->mc_all;
break;
@ -1762,45 +1807,9 @@ int compat_ip_getsockopt(struct sock *sk, int level, int optname,
int err;
if (optname == MCAST_MSFILTER) {
const int size0 = offsetof(struct compat_group_filter, gf_slist);
struct compat_group_filter __user *p = (void __user *)optval;
struct compat_group_filter gf32;
struct group_filter gf;
int ulen, err;
int num;
if (level != SOL_IP)
return -EOPNOTSUPP;
if (get_user(ulen, optlen))
return -EFAULT;
if (ulen < size0)
return -EINVAL;
if (copy_from_user(&gf32, p, size0))
return -EFAULT;
gf.gf_interface = gf32.gf_interface;
gf.gf_fmode = gf32.gf_fmode;
num = gf.gf_numsrc = gf32.gf_numsrc;
gf.gf_group = gf32.gf_group;
rtnl_lock();
lock_sock(sk);
err = ip_mc_gsfget(sk, &gf, p->gf_slist);
release_sock(sk);
rtnl_unlock();
if (err)
return err;
if (gf.gf_numsrc < num)
num = gf.gf_numsrc;
ulen = GROUP_FILTER_SIZE(num) - (sizeof(gf) - sizeof(gf32));
if (put_user(ulen, optlen) ||
put_user(gf.gf_fmode, &p->gf_fmode) ||
put_user(gf.gf_numsrc, &p->gf_numsrc))
return -EFAULT;
return 0;
return compat_ip_get_mcast_msfilter(sk, optval, optlen);
}
err = do_ip_getsockopt(sk, level, optname, optval, optlen,