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Message-Id: <20200518062808.756610-5-hch@lst.de>
Date: Mon, 18 May 2020 08:28:08 +0200
From: Christoph Hellwig <hch@....de>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>,
Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>
Cc: netdev@...r.kernel.org, linux-kernel@...r.kernel.org (open list)
Subject: [PATCH 4/4] ipv4,appletalk: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl
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@....de>
---
include/net/compat.h | 18 +++++++++++++
net/appletalk/ddp.c | 49 ++++++++++++++++++++++++++++++----
net/ipv4/af_inet.c | 38 ++++++++++++++++++++++-----
net/socket.c | 62 --------------------------------------------
4 files changed, 94 insertions(+), 73 deletions(-)
diff --git a/include/net/compat.h b/include/net/compat.h
index e341260642fee..2b5e1f7ba1533 100644
--- a/include/net/compat.h
+++ b/include/net/compat.h
@@ -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:
diff --git a/net/appletalk/ddp.c b/net/appletalk/ddp.c
index 4177a74f65436..15787e8c0629a 100644
--- a/net/appletalk/ddp.c
+++ b/net/appletalk/ddp.c
@@ -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 = {
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index fcf0d12a407a9..c35a8b2e0499e 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -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,
diff --git a/net/socket.c b/net/socket.c
index 6824470757753..80422fc3c836e 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -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)
--
2.26.2
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