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ipv4,appletalk: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl

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To prepare removing the global routing_ioctl hack start lifting the code
into the ipv4 and appletalk ->compat_ioctl handlers.  Unlike the existing
handler we don't bother copying in the name - there are no compat issues for
char arrays.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Christoph Hellwig 2020-05-18 08:28:08 +02:00 committed by David S. Miller
parent a500492354
commit dc13c8761c
4 changed files with 94 additions and 73 deletions
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18
include/net/compat.h
View file

@ -30,6 +30,24 @@ struct compat_cmsghdr {
compat_int_t cmsg_type;
};
struct compat_rtentry {
u32 rt_pad1;
struct sockaddr rt_dst; /* target address */
struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
struct sockaddr rt_genmask; /* target network mask (IP) */
unsigned short rt_flags;
short rt_pad2;
u32 rt_pad3;
unsigned char rt_tos;
unsigned char rt_class;
short rt_pad4;
short rt_metric; /* +1 for binary compatibility! */
compat_uptr_t rt_dev; /* forcing the device at add */
u32 rt_mtu; /* per route MTU/Window */
u32 rt_window; /* Window clamping */
unsigned short rt_irtt; /* Initial RTT */
};
#else /* defined(CONFIG_COMPAT) */
/*
* To avoid compiler warnings:

49
net/appletalk/ddp.c
View file

@ -57,6 +57,7 @@
#include <net/sock.h>
#include <net/tcp_states.h>
#include <net/route.h>
#include <net/compat.h>
#include <linux/atalk.h>
#include <linux/highmem.h>
@ -1839,20 +1840,58 @@ static int atalk_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
#ifdef CONFIG_COMPAT
static int atalk_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
struct compat_rtentry __user *ur)
{
compat_uptr_t rtdev;
struct rtentry rt;
if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
3 * sizeof(struct sockaddr)) ||
get_user(rt.rt_flags, &ur->rt_flags) ||
get_user(rt.rt_metric, &ur->rt_metric) ||
get_user(rt.rt_mtu, &ur->rt_mtu) ||
get_user(rt.rt_window, &ur->rt_window) ||
get_user(rt.rt_irtt, &ur->rt_irtt) ||
get_user(rtdev, &ur->rt_dev))
return -EFAULT;
switch (cmd) {
case SIOCDELRT:
if (rt.rt_dst.sa_family != AF_APPLETALK)
return -EINVAL;
return atrtr_delete(&((struct sockaddr_at *)
&rt.rt_dst)->sat_addr);
case SIOCADDRT:
rt.rt_dev = compat_ptr(rtdev);
return atrtr_ioctl_addrt(&rt);
default:
return -EINVAL;
}
}
static int atalk_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
void __user *argp = compat_ptr(arg);
struct sock *sk = sock->sk;
switch (cmd) {
case SIOCADDRT:
case SIOCDELRT:
return atalk_compat_routing_ioctl(sk, cmd, argp);
/*
* SIOCATALKDIFADDR is a SIOCPROTOPRIVATE ioctl number, so we
* cannot handle it in common code. The data we access if ifreq
* here is compatible, so we can simply call the native
* handler.
*/
if (cmd == SIOCATALKDIFADDR)
return atalk_ioctl(sock, cmd, (unsigned long)compat_ptr(arg));
return -ENOIOCTLCMD;
case SIOCATALKDIFADDR:
return atalk_ioctl(sock, cmd, (unsigned long)argp);
default:
return -ENOIOCTLCMD;
}
}
#endif
#endif /* CONFIG_COMPAT */
static const struct net_proto_family atalk_family_ops = {

38
net/ipv4/af_inet.c
View file

@ -116,6 +116,7 @@
#include <linux/mroute.h>
#endif
#include <net/l3mdev.h>
#include <net/compat.h>
#include <trace/events/sock.h>
@ -970,17 +971,42 @@ int inet_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
EXPORT_SYMBOL(inet_ioctl);
#ifdef CONFIG_COMPAT
static int inet_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
struct compat_rtentry __user *ur)
{
compat_uptr_t rtdev;
struct rtentry rt;
if (copy_from_user(&rt.rt_dst, &ur->rt_dst,
3 * sizeof(struct sockaddr)) ||
get_user(rt.rt_flags, &ur->rt_flags) ||
get_user(rt.rt_metric, &ur->rt_metric) ||
get_user(rt.rt_mtu, &ur->rt_mtu) ||
get_user(rt.rt_window, &ur->rt_window) ||
get_user(rt.rt_irtt, &ur->rt_irtt) ||
get_user(rtdev, &ur->rt_dev))
return -EFAULT;
rt.rt_dev = compat_ptr(rtdev);
return ip_rt_ioctl(sock_net(sk), cmd, &rt);
}
static int inet_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
{
void __user *argp = compat_ptr(arg);
struct sock *sk = sock->sk;
int err = -ENOIOCTLCMD;
if (sk->sk_prot->compat_ioctl)
err = sk->sk_prot->compat_ioctl(sk, cmd, arg);
return err;
switch (cmd) {
case SIOCADDRT:
case SIOCDELRT:
return inet_compat_routing_ioctl(sk, cmd, argp);
default:
if (!sk->sk_prot->compat_ioctl)
return -ENOIOCTLCMD;
return sk->sk_prot->compat_ioctl(sk, cmd, arg);
}
}
#endif
#endif /* CONFIG_COMPAT */
const struct proto_ops inet_stream_ops = {
.family = PF_INET,

62
net/socket.c
View file

@ -3366,65 +3366,6 @@ static int compat_sioc_ifmap(struct net *net, unsigned int cmd,
return err;
}
struct rtentry32 {
u32 rt_pad1;
struct sockaddr rt_dst; /* target address */
struct sockaddr rt_gateway; /* gateway addr (RTF_GATEWAY) */
struct sockaddr rt_genmask; /* target network mask (IP) */
unsigned short rt_flags;
short rt_pad2;
u32 rt_pad3;
unsigned char rt_tos;
unsigned char rt_class;
short rt_pad4;
short rt_metric; /* +1 for binary compatibility! */
/* char * */ u32 rt_dev; /* forcing the device at add */
u32 rt_mtu; /* per route MTU/Window */
u32 rt_window; /* Window clamping */
unsigned short rt_irtt; /* Initial RTT */
};
static int routing_ioctl(struct net *net, struct socket *sock,
unsigned int cmd, void __user *argp)
{
struct rtentry32 __user *ur4 = argp;
int ret;
void *r = NULL;
struct rtentry r4;
char devname[16];
u32 rtdev;
mm_segment_t old_fs = get_fs();
ret = copy_from_user(&r4.rt_dst, &(ur4->rt_dst),
3 * sizeof(struct sockaddr));
ret |= get_user(r4.rt_flags, &(ur4->rt_flags));
ret |= get_user(r4.rt_metric, &(ur4->rt_metric));
ret |= get_user(r4.rt_mtu, &(ur4->rt_mtu));
ret |= get_user(r4.rt_window, &(ur4->rt_window));
ret |= get_user(r4.rt_irtt, &(ur4->rt_irtt));
ret |= get_user(rtdev, &(ur4->rt_dev));
if (rtdev) {
ret |= copy_from_user(devname, compat_ptr(rtdev), 15);
r4.rt_dev = (char __user __force *)devname;
devname[15] = 0;
} else
r4.rt_dev = NULL;
r = (void *) &r4;
if (ret) {
ret = -EFAULT;
goto out;
}
set_fs(KERNEL_DS);
ret = sock_do_ioctl(net, sock, cmd, (unsigned long) r);
set_fs(old_fs);
out:
return ret;
}
/* Since old style bridge ioctl's endup using SIOCDEVPRIVATE
* for some operations; this forces use of the newer bridge-utils that
* use compatible ioctls
@ -3463,9 +3404,6 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
case SIOCGIFMAP:
case SIOCSIFMAP:
return compat_sioc_ifmap(net, cmd, argp);
case SIOCADDRT:
case SIOCDELRT:
return routing_ioctl(net, sock, cmd, argp);
case SIOCGSTAMP_OLD:
case SIOCGSTAMPNS_OLD:
if (!sock->ops->gettstamp)