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isisd: Add function to send SRv6 SID to zebra

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Add a function to install/remove an SRv6 SID in the forwarding plane
through Zebra.

Signed-off-by: Carmine Scarpitta <carmine.scarpitta@uniroma2.it>
This commit is contained in:
Carmine Scarpitta 2023-06-03 08:39:33 +02:00
parent 7064d8a727
commit a239951dde
1 changed files with 67 additions and 0 deletions
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67
isisd/isis_zebra.c
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@ -823,6 +823,73 @@ static int isis_zebra_client_close_notify(ZAPI_CALLBACK_ARGS)
return ret;
}
/**
* Send SRv6 SID to ZEBRA for installation or deletion.
*
* @param cmd ZEBRA_ROUTE_ADD or ZEBRA_ROUTE_DELETE
* @param sid SRv6 SID to install or delete
* @param prefixlen Prefix length
* @param oif Outgoing interface
* @param action SID action
* @param context SID context
*/
static void isis_zebra_send_localsid(int cmd, const struct in6_addr *sid,
uint16_t prefixlen, ifindex_t oif,
enum seg6local_action_t action,
const struct seg6local_context *context)
{
struct prefix_ipv6 p = {};
struct zapi_route api = {};
struct zapi_nexthop *znh;
if (cmd != ZEBRA_ROUTE_ADD && cmd != ZEBRA_ROUTE_DELETE) {
flog_warn(EC_LIB_DEVELOPMENT, "%s: wrong ZEBRA command",
__func__);
return;
}
if (prefixlen > IPV6_MAX_BITLEN) {
flog_warn(EC_LIB_DEVELOPMENT, "%s: wrong prefixlen %u",
__func__, prefixlen);
return;
}
sr_debug(" |- %s SRv6 SID %pI6 behavior %s",
cmd == ZEBRA_ROUTE_ADD ? "Add" : "Delete", sid,
seg6local_action2str(action));
p.family = AF_INET6;
p.prefixlen = prefixlen;
p.prefix = *sid;
api.vrf_id = VRF_DEFAULT;
api.type = PROTO_TYPE;
api.instance = 0;
api.safi = SAFI_UNICAST;
memcpy(&api.prefix, &p, sizeof(p));
if (cmd == ZEBRA_ROUTE_DELETE)
return (void)zclient_route_send(ZEBRA_ROUTE_DELETE, zclient,
&api);
SET_FLAG(api.flags, ZEBRA_FLAG_ALLOW_RECURSION);
SET_FLAG(api.message, ZAPI_MESSAGE_NEXTHOP);
znh = &api.nexthops[0];
memset(znh, 0, sizeof(*znh));
znh->type = NEXTHOP_TYPE_IFINDEX;
znh->ifindex = oif;
SET_FLAG(znh->flags, ZAPI_NEXTHOP_FLAG_SEG6LOCAL);
znh->seg6local_action = action;
memcpy(&znh->seg6local_ctx, context, sizeof(struct seg6local_context));
api.nexthop_num = 1;
zclient_route_send(ZEBRA_ROUTE_ADD, zclient, &api);
}
/**
* Callback to process an SRv6 locator chunk received from SRv6 Manager (zebra).
*