Exemple #1
0
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 device *dev;
	unsigned h = 0;
	int prio = 0;

	if (remote) {
		prio |= 2;
		h ^= HASH(remote);
	}
	if (local) {
		prio |= 1;
		h ^= HASH(local);
	}
	for (tp = &tunnels[prio][h]; (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->name = nt->parms.name;
	dev->init = ipip_tunnel_init;
	memcpy(&nt->parms, parms, sizeof(*parms));
	if (dev->name[0] == 0) {
		int i;
		for (i=1; i<100; i++) {
			sprintf(dev->name, "tunl%d", i);
			if (dev_get(dev->name) == NULL)
				break;
		}
		if (i==100)
			goto failed;
		memcpy(parms->name, dev->name, IFNAMSIZ);
	}
	if (register_netdevice(dev) < 0)
		goto failed;

	ipip_tunnel_link(nt);
	/* Do not decrement MOD_USE_COUNT here. */
	return nt;

failed:
	kfree(dev);
	MOD_DEC_USE_COUNT;
	return NULL;
}
Exemple #2
0
static 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;
	unsigned h = 0;
	int prio = 0;
	char name[IFNAMSIZ];

	if (remote) {
		prio |= 2;
		h ^= HASH(remote);
	}
	if (local) {
		prio |= 1;
		h ^= HASH(local);
	}
	for (tp = &tunnels[prio][h]; (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 {
		int i;
		for (i=1; i<100; i++) {
			sprintf(name, "tunl%d", i);
			if (__dev_get_by_name(name) == NULL)
				break;
		}
		if (i==100)
			goto failed;
	}

	dev = alloc_netdev(sizeof(*t), name, ipip_tunnel_setup);
	if (dev == NULL)
		return NULL;

	nt = dev->priv;
	SET_MODULE_OWNER(dev);
	dev->init = ipip_tunnel_init;
	nt->parms = *parms;

	if (register_netdevice(dev) < 0) {
		free_netdev(dev);
		goto failed;
	}

	dev_hold(dev);
	ipip_tunnel_link(nt);
	/* Do not decrement MOD_USE_COUNT here. */
	return nt;

failed:
	return NULL;
}
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;
}
Exemple #4
0
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;
}
Exemple #5
0
static int
ipip_tunnel_ioctl (struct device *dev, struct ifreq *ifr, int cmd)
{
	int err = 0;
	struct ip_tunnel_parm p;
	struct ip_tunnel *t;

	MOD_INC_USE_COUNT;

	switch (cmd) {
	case SIOCGETTUNNEL:
		t = NULL;
		if (dev == &ipip_fb_tunnel_dev) {
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p))) {
				err = -EFAULT;
				break;
			}
			t = ipip_tunnel_locate(&p, 0);
		}
		if (t == NULL)
			t = (struct ip_tunnel*)dev->priv;
		memcpy(&p, &t->parms, sizeof(p));
		if (copy_to_user(ifr->ifr_ifru.ifru_data, &p, sizeof(p)))
			err = -EFAULT;
		break;

	case SIOCADDTUNNEL:
	case SIOCCHGTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			goto done;

		err = -EFAULT;
		if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
			goto done;

		err = -EINVAL;
		if (p.iph.version != 4 || p.iph.protocol != IPPROTO_IPIP ||
		    p.iph.ihl != 5 || (p.iph.frag_off&__constant_htons(~IP_DF)))
			goto done;
		if (p.iph.ttl)
			p.iph.frag_off |= __constant_htons(IP_DF);

		t = ipip_tunnel_locate(&p, cmd == SIOCADDTUNNEL);

		if (dev != &ipip_fb_tunnel_dev && cmd == SIOCCHGTUNNEL &&
		    t != &ipip_fb_tunnel) {
			if (t != NULL) {
				if (t->dev != dev) {
					err = -EEXIST;
					break;
				}
			} else {
				if (((dev->flags&IFF_POINTOPOINT) && !p.iph.daddr) ||
				    (!(dev->flags&IFF_POINTOPOINT) && p.iph.daddr)) {
					err = -EINVAL;
					break;
				}
				t = (struct ip_tunnel*)dev->priv;
				start_bh_atomic();
				ipip_tunnel_unlink(t);
				t->parms.iph.saddr = p.iph.saddr;
				t->parms.iph.daddr = p.iph.daddr;
				memcpy(dev->dev_addr, &p.iph.saddr, 4);
				memcpy(dev->broadcast, &p.iph.daddr, 4);
				ipip_tunnel_link(t);
				end_bh_atomic();
				netdev_state_change(dev);
			}
		}

		if (t) {
			err = 0;
			if (cmd == SIOCCHGTUNNEL) {
				t->parms.iph.ttl = p.iph.ttl;
				t->parms.iph.tos = p.iph.tos;
				t->parms.iph.frag_off = p.iph.frag_off;
			}
			if (copy_to_user(ifr->ifr_ifru.ifru_data, &t->parms, sizeof(p)))
				err = -EFAULT;
		} else
			err = (cmd == SIOCADDTUNNEL ? -ENOBUFS : -ENOENT);
		break;

	case SIOCDELTUNNEL:
		err = -EPERM;
		if (!capable(CAP_NET_ADMIN))
			goto done;

		if (dev == &ipip_fb_tunnel_dev) {
			err = -EFAULT;
			if (copy_from_user(&p, ifr->ifr_ifru.ifru_data, sizeof(p)))
				goto done;
			err = -ENOENT;
			if ((t = ipip_tunnel_locate(&p, 0)) == NULL)
				goto done;
			err = -EPERM;
			if (t == &ipip_fb_tunnel)
				goto done;
		}
		err = unregister_netdevice(dev);
		break;

	default:
		err = -EINVAL;
	}

done:
	MOD_DEC_USE_COUNT;
	return err;
}