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zebra: maintain mcast tunnel origination and termination SG entries

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Each multicast tunnel is associated with a -
1. Tunnel origination mroute that is used for forwarding the
VxLAN encapsulated flow -
S - local VTEP-IP
G - BUM mcast-group
2. And a tunnel termination entry -
S - * (any remote VTEP)
G - BUM mcast-group

Multiple L2 VNIs can share the same BUM mcast group (and local-VTEP-IP).
Zebra maintains an mcast (SG) hash table to pass this info to pimd for
subsequent MDT setup.

Signed-off-by: Anuradha Karuppiah <anuradhak@cumulusnetworks.com>
This commit is contained in:
Anuradha Karuppiah 2019-03-26 13:30:29 -07:00
parent 315999e9b4
commit 8a93734c48
3 changed files with 26 additions and 0 deletions
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3
zebra/zebra_vrf.h
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@ -130,6 +130,9 @@ struct zebra_vrf {
/* l3-vni info */
vni_t l3vni;
/* pim mroutes installed for vxlan flooding */
struct hash *vxlan_sg_table;
bool dup_addr_detect;
int dad_time;

1
zebra/zebra_vxlan.c
View File

@ -58,6 +58,7 @@ DEFINE_MTYPE_STATIC(ZEBRA, ZL3VNI, "L3 VNI hash");
DEFINE_MTYPE_STATIC(ZEBRA, ZVNI_VTEP, "VNI remote VTEP");
DEFINE_MTYPE_STATIC(ZEBRA, MAC, "VNI MAC");
DEFINE_MTYPE_STATIC(ZEBRA, NEIGH, "VNI Neighbor");
DEFINE_MTYPE_STATIC(ZEBRA, ZVXLAN_SG, "zebra VxLAN multicast group");
/* definitions */
/* PMSI strings. */

22
zebra/zebra_vxlan_private.h
View File

@ -434,4 +434,26 @@ struct nh_walk_ctx {
}
#endif
/*
* Multicast hash table.
*
* This table contains -
* 1. The (S, G) entries used for encapsulating and forwarding BUM traffic.
* S is the local VTEP-IP and G is a BUM mcast group address.
* 2. The (X, G) entries used for terminating a BUM flow.
* Multiple L2-VNIs can share the same MDT hence the need to maintain
* an aggregated table that pimd can consume without much
* re-interpretation.
*/
typedef struct zebra_vxlan_sg_ {
struct zebra_vrf *zvrf;
struct prefix_sg sg;
char sg_str[PREFIX_SG_STR_LEN];
/* For SG - num of L2 VNIs using this entry for sending BUM traffic */
/* For XG - num of SG using this as parent */
uint32_t ref_cnt;
} zebra_vxlan_sg_t;
#endif /* _ZEBRA_VXLAN_PRIVATE_H */