[PATCH 2/4] ipv6: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl

From: Christoph Hellwig
Date: Mon May 18 2020 - 02:28:22 EST

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To prepare removing the global routing_ioctl hack start lifting the code
into a newly added ipv6 ->compat_ioctl handler.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
include/net/ipv6.h | 2 ++
net/dccp/ipv6.c | 1 +
net/ipv6/af_inet6.c | 53 +++++++++++++++++++++++++++++++++++++
net/ipv6/raw.c | 1 +
net/l2tp/l2tp_ip6.c | 1 +
net/mptcp/protocol.c | 1 +
net/sctp/ipv6.c | 1 +
net/socket.c | 63 ++++++++++++--------------------------------
8 files changed, 77 insertions(+), 46 deletions(-)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 955badd1e8ffc..5fc3a9d7b053e 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -1115,6 +1115,8 @@ int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len);
int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
int peer);
int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg);
+int inet6_compat_ioctl(struct socket *sock, unsigned int cmd,
+ unsigned long arg);

int inet6_hash_connect(struct inet_timewait_death_row *death_row,
struct sock *sk);
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 1e5e08cc0bfc3..650187d688519 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -1082,6 +1082,7 @@ static const struct proto_ops inet6_dccp_ops = {
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index a618beb9b6d54..b69496eaf9226 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -60,6 +60,7 @@
#include <net/calipso.h>
#include <net/seg6.h>
#include <net/rpl.h>
+#include <net/compat.h>

#include <linux/uaccess.h>
#include <linux/mroute6.h>
@@ -571,6 +572,56 @@ int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
}
EXPORT_SYMBOL(inet6_ioctl);

+#ifdef CONFIG_COMPAT
+struct compat_in6_rtmsg {
+ struct in6_addr rtmsg_dst;
+ struct in6_addr rtmsg_src;
+ struct in6_addr rtmsg_gateway;
+ u32 rtmsg_type;
+ u16 rtmsg_dst_len;
+ u16 rtmsg_src_len;
+ u32 rtmsg_metric;
+ u32 rtmsg_info;
+ u32 rtmsg_flags;
+ s32 rtmsg_ifindex;
+};
+
+static int inet6_compat_routing_ioctl(struct sock *sk, unsigned int cmd,
+ struct compat_in6_rtmsg __user *ur)
+{
+ struct in6_rtmsg rt;
+
+ if (copy_from_user(&rt.rtmsg_dst, &ur->rtmsg_dst,
+ 3 * sizeof(struct in6_addr)) ||
+ get_user(rt.rtmsg_type, &ur->rtmsg_type) ||
+ get_user(rt.rtmsg_dst_len, &ur->rtmsg_dst_len) ||
+ get_user(rt.rtmsg_src_len, &ur->rtmsg_src_len) ||
+ get_user(rt.rtmsg_metric, &ur->rtmsg_metric) ||
+ get_user(rt.rtmsg_info, &ur->rtmsg_info) ||
+ get_user(rt.rtmsg_flags, &ur->rtmsg_flags) ||
+ get_user(rt.rtmsg_ifindex, &ur->rtmsg_ifindex))
+ return -EFAULT;
+
+
+ return ipv6_route_ioctl(sock_net(sk), cmd, &rt);
+}
+
+int inet6_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 inet6_compat_routing_ioctl(sk, cmd, argp);
+ default:
+ return -ENOIOCTLCMD;
+ }
+}
+EXPORT_SYMBOL_GPL(inet6_compat_ioctl);
+#endif /* CONFIG_COMPAT */
+
INDIRECT_CALLABLE_DECLARE(int udpv6_sendmsg(struct sock *, struct msghdr *,
size_t));
int inet6_sendmsg(struct socket *sock, struct msghdr *msg, size_t size)
@@ -632,6 +683,7 @@ const struct proto_ops inet6_stream_ops = {
.read_sock = tcp_read_sock,
.peek_len = tcp_peek_len,
#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
@@ -660,6 +712,7 @@ const struct proto_ops inet6_dgram_ops = {
.sendpage = sock_no_sendpage,
.set_peek_off = sk_set_peek_off,
#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index 0028aa1d78691..8ef5a7b30524f 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -1377,6 +1377,7 @@ const struct proto_ops inet6_sockraw_ops = {
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
diff --git a/net/l2tp/l2tp_ip6.c b/net/l2tp/l2tp_ip6.c
index d148766f40d11..fdfef926c5916 100644
--- a/net/l2tp/l2tp_ip6.c
+++ b/net/l2tp/l2tp_ip6.c
@@ -758,6 +758,7 @@ static const struct proto_ops l2tp_ip6_ops = {
.mmap = sock_no_mmap,
.sendpage = sock_no_sendpage,
#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
diff --git a/net/mptcp/protocol.c b/net/mptcp/protocol.c
index e3a628bea2b81..ba9d3d5c625f7 100644
--- a/net/mptcp/protocol.c
+++ b/net/mptcp/protocol.c
@@ -2068,6 +2068,7 @@ static const struct proto_ops mptcp_v6_stream_ops = {
.mmap = sock_no_mmap,
.sendpage = inet_sendpage,
#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index c87af430107ae..ccfa0ab3e7f48 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -1032,6 +1032,7 @@ static const struct proto_ops inet6_seqpacket_ops = {
.recvmsg = inet_recvmsg,
.mmap = sock_no_mmap,
#ifdef CONFIG_COMPAT
+ .compat_ioctl = inet6_compat_ioctl,
.compat_setsockopt = compat_sock_common_setsockopt,
.compat_getsockopt = compat_sock_common_getsockopt,
#endif
diff --git a/net/socket.c b/net/socket.c
index 1c9a7260a41de..6824470757753 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3384,62 +3384,33 @@ struct rtentry32 {
unsigned short rt_irtt; /* Initial RTT */
};

-struct in6_rtmsg32 {
- struct in6_addr rtmsg_dst;
- struct in6_addr rtmsg_src;
- struct in6_addr rtmsg_gateway;
- u32 rtmsg_type;
- u16 rtmsg_dst_len;
- u16 rtmsg_src_len;
- u32 rtmsg_metric;
- u32 rtmsg_info;
- u32 rtmsg_flags;
- s32 rtmsg_ifindex;
-};
-
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 in6_rtmsg r6;
struct rtentry r4;
char devname[16];
u32 rtdev;
mm_segment_t old_fs = get_fs();

- if (sock && sock->sk && sock->sk->sk_family == AF_INET6) { /* ipv6 */
- struct in6_rtmsg32 __user *ur6 = argp;
- ret = copy_from_user(&r6.rtmsg_dst, &(ur6->rtmsg_dst),
- 3 * sizeof(struct in6_addr));
- ret |= get_user(r6.rtmsg_type, &(ur6->rtmsg_type));
- ret |= get_user(r6.rtmsg_dst_len, &(ur6->rtmsg_dst_len));
- ret |= get_user(r6.rtmsg_src_len, &(ur6->rtmsg_src_len));
- ret |= get_user(r6.rtmsg_metric, &(ur6->rtmsg_metric));
- ret |= get_user(r6.rtmsg_info, &(ur6->rtmsg_info));
- ret |= get_user(r6.rtmsg_flags, &(ur6->rtmsg_flags));
- ret |= get_user(r6.rtmsg_ifindex, &(ur6->rtmsg_ifindex));
-
- r = (void *) &r6;
- } else { /* ipv4 */
- struct rtentry32 __user *ur4 = argp;
- 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;
- }
+ 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;
--
2.26.2

Next message: Christoph Hellwig: "move the SIOCDELRT and SIOCADDRT compat_ioctl handlers v3"
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In reply to: Christoph Hellwig: "move the SIOCDELRT and SIOCADDRT compat_ioctl handlers v3"
Next in thread: Christoph Hellwig: "[PATCH 4/4] ipv4,appletalk: move SIOCADDRT and SIOCDELRT handling into ->compat_ioctl"
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