virtualize PPP

information from forum:

2.6.16-026test017
fc4-ve# rpm -qa | grep ppp
ppp-2.4.2-7


16120 open("/dev/ppp", O_RDWR) = -1 EPERM (Operation not permitted)


drivers/net/ppp_generic.c:
...
static int ppp_open(struct inode *inode, struct file *file)
{
        /*
         * This could (should?) be enforced by the permissions on /dev/ppp.
         */
        if (!capable(CAP_NET_ADMIN))
                return -EPERM;
        return 0;
}
...
CAP_NET_ADMIN -> CAP_VE_NET_ADMIN


Don't forget to load ppp_async module on the node:
[root@dhcp0-174 ~]# modprobe ppp_async
[root@dhcp0-174 ~]# echo $?
0


25784 ioctl(10, PPPIOCNEWUNIT, 0x80083c08) = -1 EPERM (Operation not permitted)

dmesg:
PPP: couldn't register device ppp0 (-1)

source:
        ret = register_netdev(dev);
        if (ret != 0) {
                printk(KERN_ERR "PPP: couldn't register device %s (%d)\n",
                       dev->name, ret);
                goto out2;
        }


so register_netdev() failed
      |
     \|/
      |
register_netdevice():

        ret = -EPERM;
        if (!ve_is_super(get_exec_env()) && ve_is_dev_movable(dev))
                goto out;


ppp should be in "movable" list!

tun, loopback, ... already there