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sit: advertise tunnel param via rtnl 

It is usefull for daemons that monitor link event to have the full parameters of
these interfaces when a rtnl message is sent.
It allows also to dump them via rtnetlink.

It is based on what is done for GRE tunnels.

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 2012-11-09 06:10:00 +00:00 committed by David S. Miller
parent 0974658da4
commit ba3e3f50a0
1 changed files with 56 additions and 1 deletions
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57
net/ipv6/sit.c
View File

@ -68,6 +68,7 @@
static int ipip6_tunnel_init(struct net_device *dev);
static void ipip6_tunnel_setup(struct net_device *dev);
static void ipip6_dev_free(struct net_device *dev);
static struct rtnl_link_ops sit_link_ops __read_mostly;
static int sit_net_id __read_mostly;
struct sit_net {
@ -282,6 +283,7 @@ static struct ip_tunnel *ipip6_tunnel_locate(struct net *net,
goto failed_free;
strcpy(nt->parms.name, dev->name);
dev->rtnl_link_ops = &sit_link_ops;
dev_hold(dev);
@ -1216,6 +1218,47 @@ static int __net_init ipip6_fb_tunnel_init(struct net_device *dev)
return 0;
}
static size_t sit_get_size(const struct net_device *dev)
{
return
/* IFLA_IPTUN_LINK */
nla_total_size(4) +
/* IFLA_IPTUN_LOCAL */
nla_total_size(4) +
/* IFLA_IPTUN_REMOTE */
nla_total_size(4) +
/* IFLA_IPTUN_TTL */
nla_total_size(1) +
/* IFLA_IPTUN_TOS */
nla_total_size(1) +
0;
}
static int sit_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct ip_tunnel *tunnel = netdev_priv(dev);
struct ip_tunnel_parm *parm = &tunnel->parms;
if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
nla_put_be32(skb, IFLA_IPTUN_LOCAL, parm->iph.saddr) ||
nla_put_be32(skb, IFLA_IPTUN_REMOTE, parm->iph.daddr) ||
nla_put_u8(skb, IFLA_IPTUN_TTL, parm->iph.ttl) ||
nla_put_u8(skb, IFLA_IPTUN_TOS, parm->iph.tos))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct rtnl_link_ops sit_link_ops __read_mostly = {
.kind = "sit",
.maxtype = IFLA_IPTUN_MAX,
.priv_size = sizeof(struct ip_tunnel),
.get_size = sit_get_size,
.fill_info = sit_fill_info,
};
static struct xfrm_tunnel sit_handler __read_mostly = {
.handler = ipip6_rcv,
.err_handler = ipip6_err,
@ -1302,6 +1345,7 @@ static struct pernet_operations sit_net_ops = {
static void __exit sit_cleanup(void)
{
rtnl_link_unregister(&sit_link_ops);
xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
unregister_pernet_device(&sit_net_ops);
@ -1319,10 +1363,21 @@ static int __init sit_init(void)
return err;
err = xfrm4_tunnel_register(&sit_handler, AF_INET6);
if (err < 0) {
unregister_pernet_device(&sit_net_ops);
pr_info("%s: can't add protocol\n", __func__);
goto xfrm_tunnel_failed;
}
err = rtnl_link_register(&sit_link_ops);
if (err < 0)
goto rtnl_link_failed;
out:
return err;
rtnl_link_failed:
xfrm4_tunnel_deregister(&sit_handler, AF_INET6);
xfrm_tunnel_failed:
unregister_pernet_device(&sit_net_ops);
goto out;
}
module_init(sit_init);