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ipip: 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>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nicolas Dichtel 2012-11-09 06:09:59 +00:00 committed by David S. Miller
parent 465b1678eb
commit 0974658da4
2 changed files with 67 additions and 1 deletions
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11
include/uapi/linux/if_tunnel.h
View File

@ -37,6 +37,17 @@ struct ip_tunnel_parm {
struct iphdr iph;
};
enum {
IFLA_IPTUN_UNSPEC,
IFLA_IPTUN_LINK,
IFLA_IPTUN_LOCAL,
IFLA_IPTUN_REMOTE,
IFLA_IPTUN_TTL,
IFLA_IPTUN_TOS,
__IFLA_IPTUN_MAX,
};
#define IFLA_IPTUN_MAX (__IFLA_IPTUN_MAX - 1)
/* SIT-mode i_flags */
#define SIT_ISATAP 0x0001

57
net/ipv4/ipip.c
View File

@ -138,6 +138,7 @@ struct ipip_net {
static int ipip_tunnel_init(struct net_device *dev);
static void ipip_tunnel_setup(struct net_device *dev);
static void ipip_dev_free(struct net_device *dev);
static struct rtnl_link_ops ipip_link_ops __read_mostly;
/*
* Locking : hash tables are protected by RCU and RTNL
@ -305,6 +306,7 @@ static struct ip_tunnel *ipip_tunnel_locate(struct net *net,
goto failed_free;
strcpy(nt->parms.name, dev->name);
dev->rtnl_link_ops = &ipip_link_ops;
dev_hold(dev);
ipip_tunnel_link(ipn, nt);
@ -841,6 +843,47 @@ static int __net_init ipip_fb_tunnel_init(struct net_device *dev)
return 0;
}
static size_t ipip_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 ipip_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 ipip_link_ops __read_mostly = {
.kind = "ipip",
.maxtype = IFLA_IPTUN_MAX,
.priv_size = sizeof(struct ip_tunnel),
.get_size = ipip_get_size,
.fill_info = ipip_fill_info,
};
static struct xfrm_tunnel ipip_handler __read_mostly = {
.handler = ipip_rcv,
.err_handler = ipip_err,
@ -937,14 +980,26 @@ static int __init ipip_init(void)
return err;
err = xfrm4_tunnel_register(&ipip_handler, AF_INET);
if (err < 0) {
unregister_pernet_device(&ipip_net_ops);
pr_info("%s: can't register tunnel\n", __func__);
goto xfrm_tunnel_failed;
}
err = rtnl_link_register(&ipip_link_ops);
if (err < 0)
goto rtnl_link_failed;
out:
return err;
rtnl_link_failed:
xfrm4_tunnel_deregister(&ipip_handler, AF_INET);
xfrm_tunnel_failed:
unregister_pernet_device(&ipip_net_ops);
goto out;
}
static void __exit ipip_fini(void)
{
rtnl_link_unregister(&ipip_link_ops);
if (xfrm4_tunnel_deregister(&ipip_handler, AF_INET))
pr_info("%s: can't deregister tunnel\n", __func__);