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tunnels: support MPLS over IPv4 tunnels

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Extend tunnel support to MPLS over IPv4.  The implementation extends the
existing differentiation between IPIP and IPv6 over IPv4 to also cover MPLS
over IPv4.

Signed-off-by: Simon Horman <simon.horman@netronome.com>
Reviewed-by: Dinan Gunawardena <dinan.gunawardena@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Simon Horman 2016-07-07 07:56:12 +02:00 committed by David S. Miller
parent a65056ecf4
commit 8afe97e5d4
1 changed files with 67 additions and 10 deletions
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77
net/ipv4/tunnel4.c
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@ -6,6 +6,7 @@
#include <linux/init.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/mpls.h>
#include <linux/netdevice.h>
#include <linux/skbuff.h>
#include <linux/slab.h>
@ -16,11 +17,14 @@
static struct xfrm_tunnel __rcu *tunnel4_handlers __read_mostly;
static struct xfrm_tunnel __rcu *tunnel64_handlers __read_mostly;
static struct xfrm_tunnel __rcu *tunnelmpls4_handlers __read_mostly;
static DEFINE_MUTEX(tunnel4_mutex);
static inline struct xfrm_tunnel __rcu **fam_handlers(unsigned short family)
{
return (family == AF_INET) ? &tunnel4_handlers : &tunnel64_handlers;
return (family == AF_INET) ? &tunnel4_handlers :
(family == AF_INET6) ? &tunnel64_handlers :
&tunnelmpls4_handlers;
}
int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family)
@ -125,6 +129,26 @@ drop:
}
#endif
#if IS_ENABLED(CONFIG_MPLS)
static int tunnelmpls4_rcv(struct sk_buff *skb)
{
struct xfrm_tunnel *handler;
if (!pskb_may_pull(skb, sizeof(struct mpls_label)))
goto drop;
for_each_tunnel_rcu(tunnelmpls4_handlers, handler)
if (!handler->handler(skb))
return 0;
icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
drop:
kfree_skb(skb);
return 0;
}
#endif
static void tunnel4_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
@ -145,6 +169,17 @@ static void tunnel64_err(struct sk_buff *skb, u32 info)
}
#endif
#if IS_ENABLED(CONFIG_MPLS)
static void tunnelmpls4_err(struct sk_buff *skb, u32 info)
{
struct xfrm_tunnel *handler;
for_each_tunnel_rcu(tunnelmpls4_handlers, handler)
if (!handler->err_handler(skb, info))
break;
}
#endif
static const struct net_protocol tunnel4_protocol = {
.handler = tunnel4_rcv,
.err_handler = tunnel4_err,
@ -161,24 +196,46 @@ static const struct net_protocol tunnel64_protocol = {
};
#endif
#if IS_ENABLED(CONFIG_MPLS)
static const struct net_protocol tunnelmpls4_protocol = {
.handler = tunnelmpls4_rcv,
.err_handler = tunnelmpls4_err,
.no_policy = 1,
.netns_ok = 1,
};
#endif
static int __init tunnel4_init(void)
{
if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP)) {
pr_err("%s: can't add protocol\n", __func__);
return -EAGAIN;
}
if (inet_add_protocol(&tunnel4_protocol, IPPROTO_IPIP))
goto err_ipip;
#if IS_ENABLED(CONFIG_IPV6)
if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6)) {
pr_err("tunnel64 init: can't add protocol\n");
inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
return -EAGAIN;
}
if (inet_add_protocol(&tunnel64_protocol, IPPROTO_IPV6))
goto err_ipv6;
#endif
#if IS_ENABLED(CONFIG_MPLS)
if (inet_add_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS))
goto err_mpls;
#endif
return 0;
#if IS_ENABLED(CONFIG_IPV6)
err_mpls:
inet_del_protocol(&tunnel4_protocol, IPPROTO_IPV6);
#endif
err_ipv6:
inet_del_protocol(&tunnel4_protocol, IPPROTO_IPIP);
err_ipip:
pr_err("%s: can't add protocol\n", __func__);
return -EAGAIN;
}
static void __exit tunnel4_fini(void)
{
#if IS_ENABLED(CONFIG_MPLS)
if (inet_del_protocol(&tunnelmpls4_protocol, IPPROTO_MPLS))
pr_err("tunnelmpls4 close: can't remove protocol\n");
#endif
#if IS_ENABLED(CONFIG_IPV6)
if (inet_del_protocol(&tunnel64_protocol, IPPROTO_IPV6))
pr_err("tunnel64 close: can't remove protocol\n");