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ip_tunnel: add mpls over gre support

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This commit introduces the MPLSoGRE support (RFC 4023), using ip tunnel
API by simply adding ipgre_tunnel_encap_(add|del)_mpls_ops() and the new
tunnel type TUNNEL_ENCAP_MPLS.

Signed-off-by: Amine Kherbouche <amine.kherbouche@6wind.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Amine Kherbouche 2017-10-04 19:35:57 +02:00 committed by David S. Miller
parent 2af48d430a
commit bdc476413d
2 changed files with 37 additions and 0 deletions
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1
include/uapi/linux/if_tunnel.h
View File

@ -84,6 +84,7 @@ enum tunnel_encap_types {
TUNNEL_ENCAP_NONE, TUNNEL_ENCAP_NONE,
TUNNEL_ENCAP_FOU, TUNNEL_ENCAP_FOU,
TUNNEL_ENCAP_GUE, TUNNEL_ENCAP_GUE,
TUNNEL_ENCAP_MPLS,
}; };
#define TUNNEL_ENCAP_FLAG_CSUM (1<<0) #define TUNNEL_ENCAP_FLAG_CSUM (1<<0)

36
net/mpls/af_mpls.c
View File

@ -16,6 +16,7 @@
#include <net/arp.h> #include <net/arp.h>
#include <net/ip_fib.h> #include <net/ip_fib.h>
#include <net/netevent.h> #include <net/netevent.h>
#include <net/ip_tunnels.h>
#include <net/netns/generic.h> #include <net/netns/generic.h>
#if IS_ENABLED(CONFIG_IPV6) #if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h> #include <net/ipv6.h>
@ -39,6 +40,36 @@ static int one = 1;
static int label_limit = (1 << 20) - 1; static int label_limit = (1 << 20) - 1;
static int ttl_max = 255; static int ttl_max = 255;
#if IS_ENABLED(CONFIG_NET_IP_TUNNEL)
size_t ipgre_mpls_encap_hlen(struct ip_tunnel_encap *e)
{
return sizeof(struct mpls_shim_hdr);
}
static const struct ip_tunnel_encap_ops mpls_iptun_ops = {
.encap_hlen = ipgre_mpls_encap_hlen,
};
static int ipgre_tunnel_encap_add_mpls_ops(void)
{
return ip_tunnel_encap_add_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
}
static void ipgre_tunnel_encap_del_mpls_ops(void)
{
ip_tunnel_encap_del_ops(&mpls_iptun_ops, TUNNEL_ENCAP_MPLS);
}
#else
static int ipgre_tunnel_encap_add_mpls_ops(void)
{
return 0;
}
static void ipgre_tunnel_encap_del_mpls_ops(void)
{
}
#endif
static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt, static void rtmsg_lfib(int event, u32 label, struct mpls_route *rt,
struct nlmsghdr *nlh, struct net *net, u32 portid, struct nlmsghdr *nlh, struct net *net, u32 portid,
unsigned int nlm_flags); unsigned int nlm_flags);
@ -2485,6 +2516,10 @@ static int __init mpls_init(void)
0); 0);
rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf, rtnl_register(PF_MPLS, RTM_GETNETCONF, mpls_netconf_get_devconf,
mpls_netconf_dump_devconf, 0); mpls_netconf_dump_devconf, 0);
err = ipgre_tunnel_encap_add_mpls_ops();
if (err)
pr_err("Can't add mpls over gre tunnel ops\n");
err = 0; err = 0;
out: out:
return err; return err;
@ -2502,6 +2537,7 @@ static void __exit mpls_exit(void)
dev_remove_pack(&mpls_packet_type); dev_remove_pack(&mpls_packet_type);
unregister_netdevice_notifier(&mpls_dev_notifier); unregister_netdevice_notifier(&mpls_dev_notifier);
unregister_pernet_subsys(&mpls_net_ops); unregister_pernet_subsys(&mpls_net_ops);
ipgre_tunnel_encap_del_mpls_ops();
} }
module_exit(mpls_exit); module_exit(mpls_exit);