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ip6tnl: add support of link creation via rtnl

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

Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2012-11-14 05:14:00 +00:00 committed by David S. Miller
parent b58d731acc
commit 0b11245722
1 changed files with 149 additions and 15 deletions
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164
net/ipv6/ip6_tunnel.c
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@ -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 @@ nla_put_failure:
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,
};