struct ip_tunnel * ipip_tunnel_locate(struct ip_tunnel_parm *parms, int create)
{
u32 remote = parms->iph.daddr;
u32 local = parms->iph.saddr;
struct ip_tunnel *t, **tp, *nt;
struct net_device *dev;
for (tp = __ipip_bucket(parms); (t = *tp) != NULL; tp = &t->next) {
if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
return t;
}
if (!create)
return NULL;
MOD_INC_USE_COUNT;
dev = kmalloc(sizeof(*dev) + sizeof(*t), GFP_KERNEL);
if (dev == NULL) {
MOD_DEC_USE_COUNT;
return NULL;
}
memset(dev, 0, sizeof(*dev) + sizeof(*t));
dev->priv = (void*)(dev+1);
nt = (struct ip_tunnel*)dev->priv;
nt->dev = dev;
dev->init = ipip_tunnel_init;
dev->features |= NETIF_F_DYNALLOC;
memcpy(&nt->parms, parms, sizeof(*parms));
nt->parms.name[IFNAMSIZ-1] = '\0';
strcpy(dev->name, nt->parms.name);
if (dev->name[0] == 0) {
int i;
for (i=1; i<100; i++) {
sprintf(dev->name, "tunl%d", i);
if (__dev_get_by_name(dev->name) == NULL)
break;
}
if (i==100)
goto failed;
memcpy(nt->parms.name, dev->name, IFNAMSIZ);
}
if (register_netdevice(dev) < 0)
goto failed;
dev_hold(dev);
ipip_tunnel_link(nt);
/* Do not decrement MOD_USE_COUNT here. */
return nt;
failed:
kfree(dev);
MOD_DEC_USE_COUNT;
return NULL;
}
static struct ip_tunnel * ipip_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 ipip_net *ipn = net_generic(net, ipip_net_id);
for (tp = __ipip_bucket(ipn, parms); (t = *tp) != NULL; tp = &t->next) {
if (local == t->parms.iph.saddr && remote == t->parms.iph.daddr)
return t;
}
if (!create)
return NULL;
if (parms->name[0])
strlcpy(name, parms->name, IFNAMSIZ);
else
sprintf(name, "tunl%%d");
dev = alloc_netdev(sizeof(*t), name, ipip_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;
ipip_tunnel_init(dev);
if (register_netdevice(dev) < 0)
goto failed_free;
dev_hold(dev);
ipip_tunnel_link(ipn, nt);
return nt;
failed_free:
free_netdev(dev);
return NULL;
}
