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isisd: Add func to install SRv6 SID in dplane

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Add a function to install an SRv6 SID in the data plane through
zebra.

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2023-02-22 11:18:46 +01:00
parent a239951dde
commit 8b6d051c54
3 changed files with 70 additions and 0 deletions
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3
isisd/isis_srv6.h
View File

@ -18,6 +18,9 @@
#define SRV6_MAX_H_ENCAPS 2
#define SRV6_MAX_END_D 5
/* Name of the interface used for installing SRv6 SIDs into the data plane */
#define SRV6_IFNAME "sr0"
/* SRv6 SID structure */
struct isis_srv6_sid_structure {
uint8_t loc_block_len;

65
isisd/isis_zebra.c
View File

@ -890,6 +890,71 @@ static void isis_zebra_send_localsid(int cmd, const struct in6_addr *sid,
zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
}
/**
* Install SRv6 SID in the forwarding plane through Zebra.
*
* @param area IS-IS area
* @param sid SRv6 SID
*/
void isis_zebra_srv6_sid_install(struct isis_area *area,
struct isis_srv6_sid *sid)
{
enum seg6local_action_t action = ZEBRA_SEG6_LOCAL_ACTION_UNSPEC;
uint16_t prefixlen = IPV6_MAX_BITLEN;
struct seg6local_context ctx = {};
struct interface *ifp;
if (!area || !sid)
return;
sr_debug("ISIS-SRv6 (%s): setting SRv6 SID %pI6", area->area_tag,
&sid->sid);
switch (sid->behavior) {
case SRV6_ENDPOINT_BEHAVIOR_END:
action = ZEBRA_SEG6_LOCAL_ACTION_END;
prefixlen = IPV6_MAX_BITLEN;
break;
case SRV6_ENDPOINT_BEHAVIOR_END_NEXT_CSID:
action = ZEBRA_SEG6_LOCAL_ACTION_END;
prefixlen = sid->locator->block_bits_length +
sid->locator->node_bits_length;
SET_SRV6_FLV_OP(ctx.flv.flv_ops,
ZEBRA_SEG6_LOCAL_FLV_OP_NEXT_CSID);
ctx.flv.lcblock_len = sid->locator->block_bits_length;
ctx.flv.lcnode_func_len = sid->locator->node_bits_length;
break;
case SRV6_ENDPOINT_BEHAVIOR_END_X:
case SRV6_ENDPOINT_BEHAVIOR_END_X_NEXT_CSID:
case SRV6_ENDPOINT_BEHAVIOR_RESERVED:
case SRV6_ENDPOINT_BEHAVIOR_END_DT6:
case SRV6_ENDPOINT_BEHAVIOR_END_DT4:
case SRV6_ENDPOINT_BEHAVIOR_END_DT46:
case SRV6_ENDPOINT_BEHAVIOR_END_DT6_USID:
case SRV6_ENDPOINT_BEHAVIOR_END_DT4_USID:
case SRV6_ENDPOINT_BEHAVIOR_END_DT46_USID:
case SRV6_ENDPOINT_BEHAVIOR_OPAQUE:
default:
zlog_err(
"ISIS-SRv6 (%s): unsupported SRv6 endpoint behavior %u",
area->area_tag, sid->behavior);
return;
}
/* Attach the SID to the SRv6 interface */
ifp = if_lookup_by_name(SRV6_IFNAME, VRF_DEFAULT);
if (!ifp) {
zlog_warn(
"Failed to install SRv6 SID %pI6: %s interface not found",
&sid->sid, SRV6_IFNAME);
return;
}
/* Send the SID to zebra */
isis_zebra_send_localsid(ZEBRA_ROUTE_ADD, &sid->sid, prefixlen,
ifp->ifindex, action, &ctx);
}
/**
* Callback to process an SRv6 locator chunk received from SRv6 Manager (zebra).
*

2
isisd/isis_zebra.h
View File

@ -57,6 +57,8 @@ void isis_zebra_vrf_register(struct isis *isis);
void isis_zebra_vrf_deregister(struct isis *isis);
int isis_zebra_ls_register(bool up);
extern void isis_zebra_srv6_sid_install(struct isis_area *area,
struct isis_srv6_sid *sid);
extern int isis_zebra_srv6_manager_get_locator_chunk(const char *name);
extern int isis_zebra_srv6_manager_release_locator_chunk(const char *name);