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Commit be42da0e authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by David S. Miller
Browse files

ipip: add support of link creation via rtnl 



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

Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent befe2aa1

net/ipv4/ipip.c

+141 −24
Original line number Diff line number Diff line
@@ -249,6 +249,32 @@ static void ipip_tunnel_link(struct ipip_net *ipn, struct ip_tunnel *t) 
	rcu_assign_pointer(*tp, t);

}



static int ipip_tunnel_create(struct net_device *dev)

{

	struct ip_tunnel *t = netdev_priv(dev);

	struct net *net = dev_net(dev);

	struct ipip_net *ipn = net_generic(net, ipip_net_id);

	int err;



	err = ipip_tunnel_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 = &ipip_link_ops;



	dev_hold(dev);

	ipip_tunnel_link(ipn, t);

	return 0;



out:

	return err;

}



static struct ip_tunnel *ipip_tunnel_locate(struct net *net,

		struct ip_tunnel_parm *parms, int create)

{
@@ -283,17 +309,9 @@ static struct ip_tunnel *ipip_tunnel_locate(struct net *net, 
	nt = netdev_priv(dev);

	nt->parms = *parms;



	if (ipip_tunnel_init(dev) < 0)

	if (ipip_tunnel_create(dev) < 0)

		goto failed_free;



	if (register_netdevice(dev) < 0)

		goto failed_free;



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

	dev->rtnl_link_ops = &ipip_link_ops;



	dev_hold(dev);

	ipip_tunnel_link(ipn, nt);

	return nt;



failed_free:
@@ -622,6 +640,28 @@ static void ipip_tunnel_bind_dev(struct net_device *dev) 
	dev->iflink = tunnel->parms.link;

}



static void ipip_tunnel_update(struct ip_tunnel *t, struct ip_tunnel_parm *p)

{

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

	struct ipip_net *ipn = net_generic(net, ipip_net_id);



	ipip_tunnel_unlink(ipn, t);

	synchronize_net();

	t->parms.iph.saddr = p->iph.saddr;

	t->parms.iph.daddr = p->iph.daddr;

	memcpy(t->dev->dev_addr, &p->iph.saddr, 4);

	memcpy(t->dev->broadcast, &p->iph.daddr, 4);

	ipip_tunnel_link(ipn, t);

	t->parms.iph.ttl = p->iph.ttl;

	t->parms.iph.tos = p->iph.tos;

	t->parms.iph.frag_off = p->iph.frag_off;

	if (t->parms.link != p->link) {

		t->parms.link = p->link;

		ipip_tunnel_bind_dev(t->dev);

	}

	netdev_state_change(t->dev);

}



static int

ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd)

{
@@ -682,21 +722,7 @@ ipip_tunnel_ioctl (struct net_device *dev, struct ifreq *ifr, int cmd) 
				t = netdev_priv(dev);

			}



			ipip_tunnel_unlink(ipn, t);

			synchronize_net();

			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(ipn, t);

			t->parms.iph.ttl = p.iph.ttl;

			t->parms.iph.tos = p.iph.tos;

			t->parms.iph.frag_off = p.iph.frag_off;

			if (t->parms.link != p.link) {

				t->parms.link = p.link;

				ipip_tunnel_bind_dev(dev);

			}

			netdev_state_change(dev);

			ipip_tunnel_update(t, &p);

		}



		if (t) {
@@ -822,6 +848,84 @@ static int __net_init ipip_fb_tunnel_init(struct net_device *dev) 
	return 0;

}



static void ipip_netlink_parms(struct nlattr *data[],

			       struct ip_tunnel_parm *parms)

{

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



	parms->iph.version = 4;

	parms->iph.protocol = IPPROTO_IPIP;

	parms->iph.ihl = 5;



	if (!data)

		return;



	if (data[IFLA_IPTUN_LINK])

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



	if (data[IFLA_IPTUN_LOCAL])

		parms->iph.saddr = nla_get_u32(data[IFLA_IPTUN_LOCAL]);



	if (data[IFLA_IPTUN_REMOTE])

		parms->iph.daddr = nla_get_u32(data[IFLA_IPTUN_REMOTE]);



	if (data[IFLA_IPTUN_TTL]) {

		parms->iph.ttl = nla_get_u8(data[IFLA_IPTUN_TTL]);

		if (parms->iph.ttl)

			parms->iph.frag_off = htons(IP_DF);

	}



	if (data[IFLA_IPTUN_TOS])

		parms->iph.tos = nla_get_u8(data[IFLA_IPTUN_TOS]);



	if (!data[IFLA_IPTUN_PMTUDISC] || nla_get_u8(data[IFLA_IPTUN_PMTUDISC]))

		parms->iph.frag_off = htons(IP_DF);

}



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

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

{

	struct net *net = dev_net(dev);

	struct ip_tunnel *nt;



	nt = netdev_priv(dev);

	ipip_netlink_parms(data, &nt->parms);



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

		return -EEXIST;



	return ipip_tunnel_create(dev);

}



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

			   struct nlattr *data[])

{

	struct ip_tunnel *t;

	struct ip_tunnel_parm p;

	struct net *net = dev_net(dev);

	struct ipip_net *ipn = net_generic(net, ipip_net_id);



	if (dev == ipn->fb_tunnel_dev)

		return -EINVAL;



	ipip_netlink_parms(data, &p);



	if (((dev->flags & IFF_POINTOPOINT) && !p.iph.daddr) ||

	    (!(dev->flags & IFF_POINTOPOINT) && p.iph.daddr))

		return -EINVAL;



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



	if (t) {

		if (t->dev != dev)

			return -EEXIST;

	} else

		t = netdev_priv(dev);



	ipip_tunnel_update(t, &p);

	return 0;

}



static size_t ipip_get_size(const struct net_device *dev)

{

	return
@@ -859,10 +963,23 @@ static int ipip_fill_info(struct sk_buff *skb, const struct net_device *dev) 
	return -EMSGSIZE;

}



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

	[IFLA_IPTUN_LINK]		= { .type = NLA_U32 },

	[IFLA_IPTUN_LOCAL]		= { .type = NLA_U32 },

	[IFLA_IPTUN_REMOTE]		= { .type = NLA_U32 },

	[IFLA_IPTUN_TTL]		= { .type = NLA_U8 },

	[IFLA_IPTUN_TOS]		= { .type = NLA_U8 },

	[IFLA_IPTUN_PMTUDISC]		= { .type = NLA_U8 },

};



static struct rtnl_link_ops ipip_link_ops __read_mostly = {

	.kind		= "ipip",

	.maxtype	= IFLA_IPTUN_MAX,

	.policy		= ipip_policy,

	.priv_size	= sizeof(struct ip_tunnel),

	.setup		= ipip_tunnel_setup,

	.newlink	= ipip_newlink,

	.changelink	= ipip_changelink,

	.get_size	= ipip_get_size,

	.fill_info	= ipip_fill_info,

};