static struct ip_tunnel * ipip6_tunnel_locate(struct net *net,
struct ip_tunnel_parm *parms, int create)
{
__be32 remote = parms->iph.daddr;
__be32 local = parms->iph.saddr;
struct ip_tunnel *t, **tp, *nt;
struct net_device *dev;
char name[IFNAMSIZ];
struct sit_net *sitn = net_generic(net, sit_net_id);
for (tp = __ipip6_bucket(sitn, parms); (t = *tp) != NULL; tp = &t->next) {
if (local == t->parms.iph.saddr &&
remote == t->parms.iph.daddr &&
parms->link == t->parms.link) {
if (create)
return NULL;
else
return t;
}
}
if (!create)
goto failed;
if (parms->name[0])
strlcpy(name, parms->name, IFNAMSIZ);
else
sprintf(name, "sit%%d");
dev = alloc_netdev(sizeof(*t), name, ipip6_tunnel_setup);
if (dev == NULL)
return NULL;
dev_net_set(dev, net);
if (strchr(name, '%')) {
if (dev_alloc_name(dev, name) < 0)
goto failed_free;
}
nt = netdev_priv(dev);
nt->parms = *parms;
ipip6_tunnel_init(dev);
if (parms->i_flags & SIT_ISATAP)
dev->priv_flags |= IFF_ISATAP;
if (register_netdevice(dev) < 0)
goto failed_free;
dev_hold(dev);
ipip6_tunnel_link(sitn, nt);
return nt;
failed_free:
free_netdev(dev);
failed:
return NULL;
}
static int sit_rst(loff_t start, struct cpt_netdev_image *di,
struct rst_ops *ops, struct cpt_context *ctx)
{
int err = -ENODEV;
struct cpt_tunnel_image v;
struct net_device *dev;
struct ip_tunnel *t;
loff_t pos;
int fbdev;
struct sit_net *sitn;
sitn = net_generic(get_exec_env()->ve_netns, sit_net_id);
if (sitn == NULL)
return -EOPNOTSUPP;
pos = start + di->cpt_hdrlen;
err = ops->get_object(CPT_OBJ_NET_IPIP_TUNNEL,
pos, &v, sizeof(v), ctx);
if (err)
return err;
/* some sanity */
if (v.cpt_content != CPT_CONTENT_VOID)
return -EINVAL;
if (!(v.cpt_tnl_flags & CPT_TUNNEL_SIT))
return 1;
if (v.cpt_tnl_flags & CPT_TUNNEL_FBDEV) {
fbdev = 1;
err = 0;
dev = sitn->fb_tunnel_dev;
} else {
fbdev = 0;
err = -ENOMEM;
dev = alloc_netdev(sizeof(struct ip_tunnel), di->cpt_name,
ipip6_tunnel_setup);
if (!dev)
goto out;
}
t = netdev_priv(dev);
t->parms.i_flags = v.cpt_i_flags;
t->parms.o_flags = v.cpt_o_flags;
t->parms.i_key = v.cpt_i_key;
t->parms.o_key = v.cpt_o_key;
BUILD_BUG_ON(sizeof(v.cpt_iphdr) != sizeof(t->parms.iph));
memcpy(&t->parms.iph, &v.cpt_iphdr, sizeof(t->parms.iph));
if (!fbdev) {
ipip6_tunnel_init(dev);
err = register_netdevice(dev);
if (err) {
free_netdev(dev);
goto out;
}
dev_hold(dev);
ipip6_tunnel_link(sitn, t);
}
out:
return err;
}