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Commit 0b112457 authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

ip6tnl: add support of link creation via rtnl 



This patch add the support of 'ip link .. type ip6tnl'.

Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent b58d731a

net/ipv6/ip6_tunnel.c

+149 −15
Original line number Diff line number Diff line
@@ -251,6 +251,33 @@ static void ip6_dev_free(struct net_device *dev) 
	free_netdev(dev);

}



static int ip6_tnl_create2(struct net_device *dev)

{

	struct ip6_tnl *t = netdev_priv(dev);

	struct net *net = dev_net(dev);

	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);

	int err;



	t = netdev_priv(dev);

	err = ip6_tnl_dev_init(dev);

	if (err < 0)

		goto out;



	err = register_netdevice(dev);

	if (err < 0)

		goto out;



	strcpy(t->parms.name, dev->name);

	dev->rtnl_link_ops = &ip6_link_ops;



	dev_hold(dev);

	ip6_tnl_link(ip6n, t);

	return 0;



out:

	return err;

}



/**

 * ip6_tnl_create - create a new tunnel

 *   @p: tunnel parameters
@@ -269,7 +296,6 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 
	struct ip6_tnl *t;

	char name[IFNAMSIZ];

	int err;

	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);



	if (p->name[0])

		strlcpy(name, p->name, IFNAMSIZ);
@@ -284,18 +310,10 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p) 


	t = netdev_priv(dev);

	t->parms = *p;

	err = ip6_tnl_dev_init(dev);

	err = ip6_tnl_create2(dev);

	if (err < 0)

		goto failed_free;



	if ((err = register_netdevice(dev)) < 0)

		goto failed_free;



	strcpy(t->parms.name, dev->name);

	dev->rtnl_link_ops = &ip6_link_ops;



	dev_hold(dev);

	ip6_tnl_link(ip6n, t);

	return t;



failed_free:
@@ -1230,6 +1248,20 @@ ip6_tnl_change(struct ip6_tnl *t, const struct __ip6_tnl_parm *p) 
	return 0;

}



static int ip6_tnl_update(struct ip6_tnl *t, struct __ip6_tnl_parm *p)

{

	struct net *net = dev_net(t->dev);

	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);

	int err;



	ip6_tnl_unlink(ip6n, t);

	synchronize_net();

	err = ip6_tnl_change(t, p);

	ip6_tnl_link(ip6n, t);

	netdev_state_change(t->dev);

	return err;

}



static void

ip6_tnl_parm_from_user(struct __ip6_tnl_parm *p, const struct ip6_tnl_parm *u)

{
@@ -1338,11 +1370,7 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd) 
			} else

				t = netdev_priv(dev);



			ip6_tnl_unlink(ip6n, t);

			synchronize_net();

			err = ip6_tnl_change(t, &p1);

			ip6_tnl_link(ip6n, t);

			netdev_state_change(dev);

			err = ip6_tnl_update(t, &p1);

		}

		if (t) {

			err = 0;
@@ -1498,6 +1526,96 @@ static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev) 
	return 0;

}



static int ip6_tnl_validate(struct nlattr *tb[], struct nlattr *data[])

{

	u8 proto;



	if (!data)

		return 0;



	proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);

	if (proto != IPPROTO_IPV6 &&

	    proto != IPPROTO_IPIP &&

	    proto != 0)

		return -EINVAL;



	return 0;

}



static void ip6_tnl_netlink_parms(struct nlattr *data[],

				  struct __ip6_tnl_parm *parms)

{

	memset(parms, 0, sizeof(*parms));



	if (!data)

		return;



	if (data[IFLA_IPTUN_LINK])

		parms->link = nla_get_u32(data[IFLA_IPTUN_LINK]);



	if (data[IFLA_IPTUN_LOCAL])

		nla_memcpy(&parms->laddr, data[IFLA_IPTUN_LOCAL],

			   sizeof(struct in6_addr));



	if (data[IFLA_IPTUN_REMOTE])

		nla_memcpy(&parms->raddr, data[IFLA_IPTUN_REMOTE],

			   sizeof(struct in6_addr));



	if (data[IFLA_IPTUN_TTL])

		parms->hop_limit = nla_get_u8(data[IFLA_IPTUN_TTL]);



	if (data[IFLA_IPTUN_ENCAP_LIMIT])

		parms->encap_limit = nla_get_u8(data[IFLA_IPTUN_ENCAP_LIMIT]);



	if (data[IFLA_IPTUN_FLOWINFO])

		parms->flowinfo = nla_get_u32(data[IFLA_IPTUN_FLOWINFO]);



	if (data[IFLA_IPTUN_FLAGS])

		parms->flags = nla_get_u32(data[IFLA_IPTUN_FLAGS]);



	if (data[IFLA_IPTUN_PROTO])

		parms->proto = nla_get_u8(data[IFLA_IPTUN_PROTO]);

}



static int ip6_tnl_newlink(struct net *src_net, struct net_device *dev,

			   struct nlattr *tb[], struct nlattr *data[])

{

	struct net *net = dev_net(dev);

	struct ip6_tnl *nt;



	nt = netdev_priv(dev);

	ip6_tnl_netlink_parms(data, &nt->parms);



	if (ip6_tnl_locate(net, &nt->parms, 0))

		return -EEXIST;



	return ip6_tnl_create2(dev);

}



static int ip6_tnl_changelink(struct net_device *dev, struct nlattr *tb[],

			      struct nlattr *data[])

{

	struct ip6_tnl *t;

	struct __ip6_tnl_parm p;

	struct net *net = dev_net(dev);

	struct ip6_tnl_net *ip6n = net_generic(net, ip6_tnl_net_id);



	if (dev == ip6n->fb_tnl_dev)

		return -EINVAL;



	ip6_tnl_netlink_parms(data, &p);



	t = ip6_tnl_locate(net, &p, 0);



	if (t) {

		if (t->dev != dev)

			return -EEXIST;

	} else

		t = netdev_priv(dev);



	return ip6_tnl_update(t, &p);

}



static size_t ip6_tnl_get_size(const struct net_device *dev)

{

	return
@@ -1542,10 +1660,26 @@ static int ip6_tnl_fill_info(struct sk_buff *skb, const struct net_device *dev) 
	return -EMSGSIZE;

}



static const struct nla_policy ip6_tnl_policy[IFLA_IPTUN_MAX + 1] = {

	[IFLA_IPTUN_LINK]		= { .type = NLA_U32 },

	[IFLA_IPTUN_LOCAL]		= { .len = sizeof(struct in6_addr) },

	[IFLA_IPTUN_REMOTE]		= { .len = sizeof(struct in6_addr) },

	[IFLA_IPTUN_TTL]		= { .type = NLA_U8 },

	[IFLA_IPTUN_ENCAP_LIMIT]	= { .type = NLA_U8 },

	[IFLA_IPTUN_FLOWINFO]		= { .type = NLA_U32 },

	[IFLA_IPTUN_FLAGS]		= { .type = NLA_U32 },

	[IFLA_IPTUN_PROTO]		= { .type = NLA_U8 },

};



static struct rtnl_link_ops ip6_link_ops __read_mostly = {

	.kind		= "ip6tnl",

	.maxtype	= IFLA_IPTUN_MAX,

	.policy		= ip6_tnl_policy,

	.priv_size	= sizeof(struct ip6_tnl),

	.setup		= ip6_tnl_dev_setup,

	.validate	= ip6_tnl_validate,

	.newlink	= ip6_tnl_newlink,

	.changelink	= ip6_tnl_changelink,

	.get_size	= ip6_tnl_get_size,

	.fill_info	= ip6_tnl_fill_info,

};