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net: Add compat support for getsockopt (MCAST_MSFILTER)

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This patch adds support for getsockopt for MCAST_MSFILTER for
both IPv4 and IPv6. It depends on the previous setsockopt patch,
and uses the same method.

Signed-off-by: David L Stevens <dlstevens@us.ibm.com>
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David L Stevens 2008-04-29 03:23:22 -07:00 committed by David S. Miller
parent be666e0a13
commit 42908c69f6
4 changed files with 94 additions and 1 deletions
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3
include/net/compat.h
View File

@ -42,5 +42,8 @@ extern int cmsghdr_from_user_compat_to_kern(struct msghdr *, struct sock *, unsi
extern int compat_mc_setsockopt(struct sock *, int, int, char __user *, int,
int (*)(struct sock *, int, int, char __user *, int));
extern int compat_mc_getsockopt(struct sock *, int, int, char __user *,
int __user *, int (*)(struct sock *, int, int, char __user *,
int __user *));
#endif /* NET_COMPAT_H */

79
net/compat.c
View File

@ -640,6 +640,85 @@ 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 *)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(VERIFY_READ, 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(VERIFY_WRITE, 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(VERIFY_READ, 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(VERIFY_READ, koptlen, sizeof(*koptlen)) ||
__get_user(klen, koptlen))
return -EFAULT;
ulen = klen - (sizeof(*kgf)-sizeof(*gf32));
if (!access_ok(VERIFY_WRITE, optlen, sizeof(*optlen)) ||
__put_user(ulen, optlen))
return -EFAULT;
if (!access_ok(VERIFY_READ, kgf, klen) ||
!access_ok(VERIFY_WRITE, 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))

9
net/ipv4/ip_sockglue.c
View File

@ -1186,7 +1186,14 @@ int ip_getsockopt(struct sock *sk, int level,
int compat_ip_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
{
int err = do_ip_getsockopt(sk, level, optname, optval, optlen);
int err;
if (optname == MCAST_MSFILTER)
return compat_mc_getsockopt(sk, level, optname, optval, optlen,
ip_getsockopt);
err = do_ip_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
/* we need to exclude all possible ENOPROTOOPTs except default case */
if (err == -ENOPROTOOPT && optname != IP_PKTOPTIONS &&

4
net/ipv6/ipv6_sockglue.c
View File

@ -1089,6 +1089,10 @@ int ipv6_getsockopt(struct sock *sk, int level, int optname,
if(level != SOL_IPV6)
return -ENOPROTOOPT;
if (optname == MCAST_MSFILTER)
return compat_mc_getsockopt(sk, level, optname, optval, optlen,
ipv6_getsockopt);
err = do_ipv6_getsockopt(sk, level, optname, optval, optlen);
#ifdef CONFIG_NETFILTER
/* we need to exclude all possible ENOPROTOOPTs except default case */