get rid of compat_mc_getsockopt()

now we can do MCAST_MSFILTER in compat ->getsockopt() without
playing silly buggers with copying things back and forth.
We can form a native struct group_filter (sans the variable-length
tail) on stack, pass that + pointer to the tail of original request
to the helper doing the bulk of the work, then do the rest of
copyout - same as the native getsockopt() does.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 79 deletions

diff --git a/net/compat.c b/net/compat.c
index 032114de4fec..7bdfda2b382a 100644
--- a/net/compat.c
+++ b/net/compat.c
@@ -538,85 +538,6 @@ int compat_mc_setsockopt(struct sock *sock, int level, int optname,
 }
 EXPORT_SYMBOL(compat_mc_setsockopt);
 
-int compat_mc_getsockopt(struct sock *sock, int level, int optname,
-	char __user *optval, int __user *optlen,
-	int (*getsockopt)(struct sock *, int, int, char __user *, int __user *))
-{
-	struct compat_group_filter __user *gf32 = (void __user *)optval;
-	struct group_filter __user *kgf;
-	int __user	*koptlen;
-	u32 interface, fmode, numsrc;
-	int klen, ulen, err;
-
-	if (optname != MCAST_MSFILTER)
-		return getsockopt(sock, level, optname, optval, optlen);
-
-	koptlen = compat_alloc_user_space(sizeof(*koptlen));
-	if (!access_ok(optlen, sizeof(*optlen)) ||
-	    __get_user(ulen, optlen))
-		return -EFAULT;
-
-	/* adjust len for pad */
-	klen = ulen + sizeof(*kgf) - sizeof(*gf32);
-
-	if (klen < GROUP_FILTER_SIZE(0))
-		return -EINVAL;
-
-	if (!access_ok(koptlen, sizeof(*koptlen)) ||
-	    __put_user(klen, koptlen))
-		return -EFAULT;
-
-	/* have to allow space for previous compat_alloc_user_space, too */
-	kgf = compat_alloc_user_space(klen+sizeof(*optlen));
-
-	if (!access_ok(gf32, __COMPAT_GF0_SIZE) ||
-	    __get_user(interface, &gf32->gf_interface) ||
-	    __get_user(fmode, &gf32->gf_fmode) ||
-	    __get_user(numsrc, &gf32->gf_numsrc) ||
-	    __put_user(interface, &kgf->gf_interface) ||
-	    __put_user(fmode, &kgf->gf_fmode) ||
-	    __put_user(numsrc, &kgf->gf_numsrc) ||
-	    copy_in_user(&kgf->gf_group, &gf32->gf_group, sizeof(kgf->gf_group)))
-		return -EFAULT;
-
-	err = getsockopt(sock, level, optname, (char __user *)kgf, koptlen);
-	if (err)
-		return err;
-
-	if (!access_ok(koptlen, sizeof(*koptlen)) ||
-	    __get_user(klen, koptlen))
-		return -EFAULT;
-
-	ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
-
-	if (!access_ok(optlen, sizeof(*optlen)) ||
-	    __put_user(ulen, optlen))
-		return -EFAULT;
-
-	if (!access_ok(kgf, klen) ||
-	    !access_ok(gf32, ulen) ||
-	    __get_user(interface, &kgf->gf_interface) ||
-	    __get_user(fmode, &kgf->gf_fmode) ||
-	    __get_user(numsrc, &kgf->gf_numsrc) ||
-	    __put_user(interface, &gf32->gf_interface) ||
-	    __put_user(fmode, &gf32->gf_fmode) ||
-	    __put_user(numsrc, &gf32->gf_numsrc))
-		return -EFAULT;
-	if (numsrc) {
-		int copylen;
-
-		klen -= GROUP_FILTER_SIZE(0);
-		copylen = numsrc * sizeof(gf32->gf_slist[0]);
-		if (copylen > klen)
-			copylen = klen;
-		if (copy_in_user(gf32->gf_slist, kgf->gf_slist, copylen))
-			return -EFAULT;
-	}
-	return err;
-}
-EXPORT_SYMBOL(compat_mc_getsockopt);
-
-
 /* Argument list sizes for compat_sys_socketcall */
 #define AL(x) ((x) * sizeof(u32))
 static unsigned char nas[21] = {