ipv6 sit: Avoid extra need for compat layer in PRL management.
We've introduced extra need of compat layer for ip_tunnel_prl{}
for PRL (Potential Router List) management. Though compat_ioctl
is still missing in ipv4/ipv6, let's make the interface more
straight-forward and eliminate extra need for nasty compat layer
anyway since the interface is new for 2.6.26.
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 3de6ffd..32e871a 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -222,15 +222,18 @@
}
-static int ipip6_tunnel_get_prl(struct ip_tunnel *t, struct ip_tunnel_prl *a)
+static int ipip6_tunnel_get_prl(struct ip_tunnel *t,
+ struct ip_tunnel_prl __user *a)
{
- struct ip_tunnel_prl *kp;
+ struct ip_tunnel_prl kprl, *kp;
struct ip_tunnel_prl_entry *prl;
unsigned int cmax, c = 0, ca, len;
int ret = 0;
- cmax = a->datalen / sizeof(*a);
- if (cmax > 1 && a->addr != htonl(INADDR_ANY))
+ if (copy_from_user(&kprl, a, sizeof(kprl)))
+ return -EFAULT;
+ cmax = kprl.datalen / sizeof(kprl);
+ if (cmax > 1 && kprl.addr != htonl(INADDR_ANY))
cmax = 1;
/* For simple GET or for root users,
@@ -261,26 +264,25 @@
for (prl = t->prl; prl; prl = prl->next) {
if (c > cmax)
break;
- if (a->addr != htonl(INADDR_ANY) && prl->addr != a->addr)
+ if (kprl.addr != htonl(INADDR_ANY) && prl->addr != kprl.addr)
continue;
kp[c].addr = prl->addr;
kp[c].flags = prl->flags;
c++;
- if (a->addr != htonl(INADDR_ANY))
+ if (kprl.addr != htonl(INADDR_ANY))
break;
}
out:
read_unlock(&ipip6_lock);
len = sizeof(*kp) * c;
- ret = len ? copy_to_user(a->data, kp, len) : 0;
+ ret = 0;
+ if ((len && copy_to_user(a + 1, kp, len)) || put_user(len, &a->datalen))
+ ret = -EFAULT;
kfree(kp);
- if (ret)
- return -EFAULT;
- a->datalen = len;
- return 0;
+ return ret;
}
static int
@@ -873,11 +875,20 @@
break;
case SIOCGETPRL:
+ err = -EINVAL;
+ if (dev == sitn->fb_tunnel_dev)
+ goto done;
+ err = -ENOENT;
+ if (!(t = netdev_priv(dev)))
+ goto done;
+ err = ipip6_tunnel_get_prl(t, ifr->ifr_ifru.ifru_data);
+ break;
+
case SIOCADDPRL:
case SIOCDELPRL:
case SIOCCHGPRL:
err = -EPERM;
- if (cmd != SIOCGETPRL && !capable(CAP_NET_ADMIN))
+ if (!capable(CAP_NET_ADMIN))
goto done;
err = -EINVAL;
if (dev == sitn->fb_tunnel_dev)
@@ -890,12 +901,6 @@
goto done;
switch (cmd) {
- case SIOCGETPRL:
- err = ipip6_tunnel_get_prl(t, &prl);
- if (!err && copy_to_user(ifr->ifr_ifru.ifru_data,
- &prl, sizeof(prl)))
- err = -EFAULT;
- break;
case SIOCDELPRL:
err = ipip6_tunnel_del_prl(t, &prl);
break;
@@ -904,8 +909,7 @@
err = ipip6_tunnel_add_prl(t, &prl, cmd == SIOCCHGPRL);
break;
}
- if (cmd != SIOCGETPRL)
- netdev_state_change(dev);
+ netdev_state_change(dev);
break;
default: