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ip6tnl: advertise tunnel param via rtnl

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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 06:10:01 +00:00 • committed by David S. Miller
commit c075b13098
2 changed files with 60 additions and 0 deletions
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3
include/uapi/linux/if_tunnel.h
View file

@ -44,6 +44,9 @@ enum {
IFLA_IPTUN_REMOTE,
IFLA_IPTUN_TTL,
IFLA_IPTUN_TOS,
IFLA_IPTUN_ENCAP_LIMIT,
IFLA_IPTUN_FLOWINFO,
IFLA_IPTUN_FLAGS,
__IFLA_IPTUN_MAX,
};
#define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1)

57
net/ipv6/ip6_tunnel.c
View file

@ -83,6 +83,7 @@ static u32 HASH(const struct in6_addr *addr1, const struct in6_addr *addr2)
static int ip6_tnl_dev_init(struct net_device *dev);
static void ip6_tnl_dev_setup(struct net_device *dev);
static struct rtnl_link_ops ip6_link_ops __read_mostly;
static int ip6_tnl_net_id __read_mostly;
struct ip6_tnl_net {
@ -299,6 +300,7 @@ static struct ip6_tnl *ip6_tnl_create(struct net *net, struct __ip6_tnl_parm *p)
goto failed_free;
strcpy(t->parms.name, dev->name);
dev->rtnl_link_ops = &ip6_link_ops;
dev_hold(dev);
ip6_tnl_link(ip6n, t);
@ -1504,6 +1506,55 @@ static int __net_init ip6_fb_tnl_dev_init(struct net_device *dev)
return 0;
}
static size_t ip6_get_size(const struct net_device *dev)
{
return
/* IFLA_IPTUN_LINK */
nla_total_size(4) +
/* IFLA_IPTUN_LOCAL */
nla_total_size(sizeof(struct in6_addr)) +
/* IFLA_IPTUN_REMOTE */
nla_total_size(sizeof(struct in6_addr)) +
/* IFLA_IPTUN_TTL */
nla_total_size(1) +
/* IFLA_IPTUN_ENCAP_LIMIT */
nla_total_size(1) +
/* IFLA_IPTUN_FLOWINFO */
nla_total_size(4) +
/* IFLA_IPTUN_FLAGS */
nla_total_size(4) +
0;
}
static int ip6_fill_info(struct sk_buff *skb, const struct net_device *dev)
{
struct ip6_tnl *tunnel = netdev_priv(dev);
struct __ip6_tnl_parm *parm = &tunnel->parms;
if (nla_put_u32(skb, IFLA_IPTUN_LINK, parm->link) ||
nla_put(skb, IFLA_IPTUN_LOCAL, sizeof(struct in6_addr),
&parm->raddr) ||
nla_put(skb, IFLA_IPTUN_REMOTE, sizeof(struct in6_addr),
&parm->laddr) ||
nla_put_u8(skb, IFLA_IPTUN_TTL, parm->hop_limit) ||
nla_put_u8(skb, IFLA_IPTUN_ENCAP_LIMIT, parm->encap_limit) ||
nla_put_be32(skb, IFLA_IPTUN_FLOWINFO, parm->flowinfo) ||
nla_put_u32(skb, IFLA_IPTUN_FLAGS, parm->flags))
goto nla_put_failure;
return 0;
nla_put_failure:
return -EMSGSIZE;
}
static struct rtnl_link_ops ip6_link_ops __read_mostly = {
.kind = "ip6tnl",
.maxtype = IFLA_IPTUN_MAX,
.priv_size = sizeof(struct ip6_tnl),
.get_size = ip6_get_size,
.fill_info = ip6_fill_info,
};
static struct xfrm6_tunnel ip4ip6_handler __read_mostly = {
.handler = ip4ip6_rcv,
.err_handler = ip4ip6_err,
@ -1612,9 +1663,14 @@ static int __init ip6_tunnel_init(void)
pr_err("%s: can't register ip6ip6\n", __func__);
goto out_ip6ip6;
}
err = rtnl_link_register(&ip6_link_ops);
if (err < 0)
goto rtnl_link_failed;
return 0;
rtnl_link_failed:
xfrm6_tunnel_deregister(&ip6ip6_handler, AF_INET6);
out_ip6ip6:
xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET);
out_ip4ip6:
@ -1629,6 +1685,7 @@ out_pernet:
static void __exit ip6_tunnel_cleanup(void)
{
rtnl_link_unregister(&ip6_link_ops);
if (xfrm6_tunnel_deregister(&ip4ip6_handler, AF_INET))
pr_info("%s: can't deregister ip4ip6\n", __func__);