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.hor...@netronome.com>
Reviewed-by: Dinan Gunawardena <dinan.gunaward...@netronome.com>
---
net/ipv4/tunnel4.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++-------
1 file changed, 67 insertions(+), 10 deletions(-)
diff --git a/net/ipv4/tunnel4.c b/net/ipv4/tunnel4.c
index 0d0171830620..45cd4253583a 100644
--- a/net/ipv4/tunnel4.c
+++ b/net/ipv4/tunnel4.c
@@ -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");
--
2.7.0.rc3.207.g0ac5344
