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bgpd: introduction of vxlan tunnel attribute

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As per draft-ietf-idr-tunnel-encaps-02, section 3.2.1, BGP Encap
attribute supports vxlan tunnel type. A new tunnel attribute has been
appended to subtlv list, describing the vxlan network identifier to
be used for the routing information of the BGP update message.

Signed-off-by: Philippe Guibert <philippe.guibert@6wind.com>
This commit is contained in:
Philippe Guibert 2016-08-10 10:46:53 +02:00
parent 4fadf88120
commit aee875b537
5 changed files with 44 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
bgpd/bgp_attr.c
View File

@ -3390,8 +3390,9 @@ bgp_packet_attribute (struct bgp *bgp, struct peer *peer,
stream_put_ipv4 (s, attr->extra->aggregator_addr.s_addr);
}
if ((afi == AFI_IP || afi == AFI_IP6) &&
(safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN))
if (((afi == AFI_IP || afi == AFI_IP6) &&
(safi == SAFI_ENCAP || safi == SAFI_MPLS_VPN)) ||
(afi == AFI_L2VPN && safi == SAFI_EVPN))
{
/* Tunnel Encap attribute */
bgp_packet_mpattr_tea(bgp, peer, s, attr, BGP_ATTR_ENCAP);

22
bgpd/bgp_encap_tlv.c
View File

@ -391,8 +391,30 @@ bgp_encap_type_vxlan_to_tlv(
struct attr *attr)
{
struct attr_extra *extra = bgp_attr_extra_get(attr);
struct bgp_attr_encap_subtlv *tlv;
uint32_t vnid;
extra->encap_tunneltype = BGP_ENCAP_TYPE_VXLAN;
if(bet == NULL ||!bet->vnid)
return;
if(extra->encap_subtlvs)
XFREE(MTYPE_ENCAP_TLV, extra->encap_subtlvs);
tlv = XCALLOC (MTYPE_ENCAP_TLV, sizeof(struct bgp_attr_encap_subtlv)-1+12);
tlv->type = 1; /* encapsulation type */
tlv->length = 12;
if(bet->vnid)
{
vnid = htonl(bet->vnid | VXLAN_ENCAP_MASK_VNID_VALID);
memcpy(&tlv->value, &vnid, 4);
}
if(bet->mac_address)
{
char *ptr = (char *)&tlv->value + 4;
memcpy( ptr, bet->mac_address, 6);
}
extra->encap_subtlvs = tlv;
return;
}
void

7
bgpd/bgp_encap_types.h
View File

@ -167,10 +167,15 @@ struct bgp_encap_type_mpls_in_ip_tunnel_with_ipsec_transport_mode {
struct bgp_tea_subtlv_remote_endpoint st_endpoint; /* optional */
};
#define VXLAN_ENCAP_MASK_VNID_VALID 0x80000000
#define VXLAN_ENCAP_MASK_MAC_VALID 0x40000000
struct bgp_encap_type_vxlan {
uint32_t valid_subtlvs;
struct bgp_tea_subtlv_remote_endpoint st_endpoint; /* optional */
/* No subtlvs defined in spec? */
/* draft-ietf-idr-tunnel-encaps-02 */
uint32_t vnid; /* does not include V and M bit */
uint8_t *mac_address; /* optional */
};
struct bgp_encap_type_nvgre {

12
bgpd/bgp_route.c
View File

@ -68,8 +68,11 @@ Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
#include "bgpd/rfapi/vnc_import_bgp.h"
#include "bgpd/rfapi/vnc_export_bgp.h"
#endif
#include "bgpd/bgp_encap_types.h"
#include "bgpd/bgp_encap_tlv.h"
#include "bgpd/bgp_evpn.h"
/* Extern from bgp_dump.c */
extern const char *bgp_origin_str[];
extern const char *bgp_origin_long_str[];
@ -4002,7 +4005,16 @@ bgp_static_update_safi (struct bgp *bgp, struct prefix *p,
attr.flag |= ATTR_FLAG_BIT (BGP_ATTR_MULTI_EXIT_DISC);
if(afi == AFI_L2VPN)
{
overlay_index_update(&attr, bgp_static->eth_s_id, NULL);
if (bgp_static->encap_tunneltype == BGP_ENCAP_TYPE_VXLAN)
{
struct bgp_encap_type_vxlan bet;
memset(&bet, 0, sizeof(struct bgp_encap_type_vxlan));
bet.vnid = p->u.prefix_evpn.eth_tag;
bgp_encap_type_vxlan_to_tlv(&bet, &attr);
}
}
/* Apply route-map. */
if (bgp_static->rmap.name)
{

1
bgpd/bgp_route.h
View File

@ -207,6 +207,7 @@ struct bgp_static
/* EVPN */
struct eth_segment_id *eth_s_id;
char *router_mac;
uint16_t encap_tunneltype;
};
#define BGP_NEXTHOP_AFI_FROM_NHLEN(nhlen) \