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net/ipv6: switch ip6_mroute_setsockopt to sockptr_t 

Pass a sockptr_t to prepare for set_fs-less handling of the kernel
pointer from bpf-cgroup.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-07-23 08:08:59 +02:00 committed by David S. Miller
parent 89654c5fcd
commit b43c615313
3 changed files with 15 additions and 13 deletions
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8
include/linux/mroute6.h
View File

@ -8,6 +8,7 @@
#include <net/net_namespace.h>
#include <uapi/linux/mroute6.h>
#include <linux/mroute_base.h>
#include <linux/sockptr.h>
#include <net/fib_rules.h>
#ifdef CONFIG_IPV6_MROUTE
@ -25,7 +26,7 @@ static inline int ip6_mroute_opt(int opt)
struct sock;
#ifdef CONFIG_IPV6_MROUTE
extern int ip6_mroute_setsockopt(struct sock *, int, char __user *, unsigned int);
extern int ip6_mroute_setsockopt(struct sock *, int, sockptr_t, unsigned int);
extern int ip6_mroute_getsockopt(struct sock *, int, char __user *, int __user *);
extern int ip6_mr_input(struct sk_buff *skb);
extern int ip6mr_ioctl(struct sock *sk, int cmd, void __user *arg);
@ -33,9 +34,8 @@ extern int ip6mr_compat_ioctl(struct sock *sk, unsigned int cmd, void __user *ar
extern int ip6_mr_init(void);
extern void ip6_mr_cleanup(void);
#else
static inline
int ip6_mroute_setsockopt(struct sock *sock,
int optname, char __user *optval, unsigned int optlen)
static inline int ip6_mroute_setsockopt(struct sock *sock, int optname,
sockptr_t optval, unsigned int optlen)
{
return -ENOPROTOOPT;
}

17
net/ipv6/ip6mr.c
View File

@ -1629,7 +1629,8 @@ EXPORT_SYMBOL(mroute6_is_socket);
* MOSPF/PIM router set up we can clean this up.
*/
int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, unsigned int optlen)
int ip6_mroute_setsockopt(struct sock *sk, int optname, sockptr_t optval,
unsigned int optlen)
{
int ret, parent = 0;
struct mif6ctl vif;
@ -1665,7 +1666,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
case MRT6_ADD_MIF:
if (optlen < sizeof(vif))
return -EINVAL;
if (copy_from_user(&vif, optval, sizeof(vif)))
if (copy_from_sockptr(&vif, optval, sizeof(vif)))
return -EFAULT;
if (vif.mif6c_mifi >= MAXMIFS)
return -ENFILE;
@ -1678,7 +1679,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
case MRT6_DEL_MIF:
if (optlen < sizeof(mifi_t))
return -EINVAL;
if (copy_from_user(&mifi, optval, sizeof(mifi_t)))
if (copy_from_sockptr(&mifi, optval, sizeof(mifi_t)))
return -EFAULT;
rtnl_lock();
ret = mif6_delete(mrt, mifi, 0, NULL);
@ -1697,7 +1698,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
case MRT6_DEL_MFC_PROXY:
if (optlen < sizeof(mfc))
return -EINVAL;
if (copy_from_user(&mfc, optval, sizeof(mfc)))
if (copy_from_sockptr(&mfc, optval, sizeof(mfc)))
return -EFAULT;
if (parent == 0)
parent = mfc.mf6cc_parent;
@ -1718,7 +1719,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
if (optlen != sizeof(flags))
return -EINVAL;
if (get_user(flags, (int __user *)optval))
if (copy_from_sockptr(&flags, optval, sizeof(flags)))
return -EFAULT;
rtnl_lock();
mroute_clean_tables(mrt, flags);
@ -1735,7 +1736,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
if (optlen != sizeof(v))
return -EINVAL;
if (get_user(v, (int __user *)optval))
if (copy_from_sockptr(&v, optval, sizeof(v)))
return -EFAULT;
mrt->mroute_do_assert = v;
return 0;
@ -1748,7 +1749,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
if (optlen != sizeof(v))
return -EINVAL;
if (get_user(v, (int __user *)optval))
if (copy_from_sockptr(&v, optval, sizeof(v)))
return -EFAULT;
v = !!v;
rtnl_lock();
@ -1769,7 +1770,7 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, uns
if (optlen != sizeof(u32))
return -EINVAL;
if (get_user(v, (u32 __user *)optval))
if (copy_from_sockptr(&v, optval, sizeof(v)))
return -EFAULT;
/* "pim6reg%u" should not exceed 16 bytes (IFNAMSIZ) */
if (v != RT_TABLE_DEFAULT && v >= 100000000)

3
net/ipv6/ipv6_sockglue.c
View File

@ -337,7 +337,8 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname,
valbool = (val != 0);
if (ip6_mroute_opt(optname))
return ip6_mroute_setsockopt(sk, optname, optval, optlen);
return ip6_mroute_setsockopt(sk, optname, USER_SOCKPTR(optval),
optlen);
if (needs_rtnl)
rtnl_lock();