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Date: Mon, 18 May 2020 13:46:52 +0200
From: Christoph Hellwig <hch@....de>
To: "David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: Alexey Kuznetsov <kuznet@....inr.ac.ru>,
Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
Steffen Klassert <steffen.klassert@...unet.com>,
Herbert Xu <herbert@...dor.apana.org.au>,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 6/9] sit: impement ->ndo_tunnel_ctl
Implement the ->ndo_tunnel_ctl method, and use ip_tunnel_ioctl to
handle userspace requests for the SIOCGETTUNNEL, SIOCADDTUNNEL,
SIOCCHGTUNNEL and SIOCDELTUNNEL ioctls.
Signed-off-by: Christoph Hellwig <hch@....de>
---
net/ipv6/sit.c | 73 +++++++++++++++++++++++---------------------------
1 file changed, 34 insertions(+), 39 deletions(-)
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 2909b2c53eaad..8a08e4c4ebbbb 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -1267,60 +1267,45 @@ __ipip6_tunnel_ioctl_validate(struct net *net, struct ip_tunnel_parm *p)
}
static int
-ipip6_tunnel_get(struct net_device *dev, struct ifreq *ifr)
+ipip6_tunnel_get(struct net_device *dev, struct ip_tunnel_parm *p)
{
struct ip_tunnel *t = netdev_priv(dev);
- struct ip_tunnel_parm p;
- if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
- if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
- return -EFAULT;
- t = ipip6_tunnel_locate(t->net, &p, 0);
- }
+ if (dev == dev_to_sit_net(dev)->fb_tunnel_dev)
+ t = ipip6_tunnel_locate(t->net, p, 0);
if (!t)
t = netdev_priv(dev);
-
- if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
- return -EFAULT;
+ memcpy(p, &t->parms, sizeof(*p));
return 0;
}
static int
-ipip6_tunnel_add(struct net_device *dev, struct ifreq *ifr)
+ipip6_tunnel_add(struct net_device *dev, struct ip_tunnel_parm *p)
{
struct ip_tunnel *t = netdev_priv(dev);
- struct ip_tunnel_parm p;
int err;
- if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
- return -EFAULT;
- err = __ipip6_tunnel_ioctl_validate(t->net, &p);
+ err = __ipip6_tunnel_ioctl_validate(t->net, p);
if (err)
return err;
- t = ipip6_tunnel_locate(t->net, &p, 1);
+ t = ipip6_tunnel_locate(t->net, p, 1);
if (!t)
return -ENOBUFS;
-
- if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
- return -EFAULT;
return 0;
}
static int
-ipip6_tunnel_change(struct net_device *dev, struct ifreq *ifr)
+ipip6_tunnel_change(struct net_device *dev, struct ip_tunnel_parm *p)
{
struct ip_tunnel *t = netdev_priv(dev);
- struct ip_tunnel_parm p;
int err;
- if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
- return -EFAULT;
- err = __ipip6_tunnel_ioctl_validate(t->net, &p);
+ err = __ipip6_tunnel_ioctl_validate(t->net, p);
if (err)
return err;
- t = ipip6_tunnel_locate(t->net, &p, 0);
+ t = ipip6_tunnel_locate(t->net, p, 0);
if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
if (!t)
return -ENOENT;
@@ -1329,33 +1314,28 @@ ipip6_tunnel_change(struct net_device *dev, struct ifreq *ifr)
if (t->dev != dev)
return -EEXIST;
} else {
- if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||
- (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))
+ if (((dev->flags & IFF_POINTOPOINT) && !p->iph.daddr) ||
+ (!(dev->flags & IFF_POINTOPOINT) && p->iph.daddr))
return -EINVAL;
t = netdev_priv(dev);
}
- ipip6_tunnel_update(t, &p, t->fwmark);
+ ipip6_tunnel_update(t, p, t->fwmark);
}
- if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
- return -EFAULT;
return 0;
}
static int
-ipip6_tunnel_del(struct net_device *dev, struct ifreq *ifr)
+ipip6_tunnel_del(struct net_device *dev, struct ip_tunnel_parm *p)
{
struct ip_tunnel *t = netdev_priv(dev);
- struct ip_tunnel_parm p;
if (!ns_capable(t->net->user_ns, CAP_NET_ADMIN))
return -EPERM;
if (dev == dev_to_sit_net(dev)->fb_tunnel_dev) {
- if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
- return -EFAULT;
- t = ipip6_tunnel_locate(t->net, &p, 0);
+ t = ipip6_tunnel_locate(t->net, p, 0);
if (!t)
return -ENOENT;
if (t == netdev_priv(dev_to_sit_net(dev)->fb_tunnel_dev))
@@ -1366,18 +1346,32 @@ ipip6_tunnel_del(struct net_device *dev, struct ifreq *ifr)
return 0;
}
+static int
+ipip6_tunnel_ctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd)
+{
+ switch (cmd) {
+ case SIOCGETTUNNEL:
+ return ipip6_tunnel_get(dev, p);
+ case SIOCADDTUNNEL:
+ return ipip6_tunnel_add(dev, p);
+ case SIOCCHGTUNNEL:
+ return ipip6_tunnel_change(dev, p);
+ case SIOCDELTUNNEL:
+ return ipip6_tunnel_del(dev, p);
+ default:
+ return -EINVAL;
+ }
+}
+
static int
ipip6_tunnel_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
{
switch (cmd) {
case SIOCGETTUNNEL:
- return ipip6_tunnel_get(dev, ifr);
case SIOCADDTUNNEL:
- return ipip6_tunnel_add(dev, ifr);
case SIOCCHGTUNNEL:
- return ipip6_tunnel_change(dev, ifr);
case SIOCDELTUNNEL:
- return ipip6_tunnel_del(dev, ifr);
+ return ip_tunnel_ioctl(dev, ifr, cmd);
case SIOCGETPRL:
return ipip6_tunnel_get_prl(dev, ifr);
case SIOCADDPRL:
@@ -1404,6 +1398,7 @@ static const struct net_device_ops ipip6_netdev_ops = {
.ndo_do_ioctl = ipip6_tunnel_ioctl,
.ndo_get_stats64 = ip_tunnel_get_stats64,
.ndo_get_iflink = ip_tunnel_get_iflink,
+ .ndo_tunnel_ctl = ipip6_tunnel_ctl,
};
static void ipip6_dev_free(struct net_device *dev)
--
2.26.2
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