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isisd: Add API to get/release SRv6 SIDs

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Add an API to get/release SRv6 SIDs through the SRv6 SID Manager.

Signed-off-by: Carmine Scarpitta <cscarpit@cisco.com>
This commit is contained in:
Carmine Scarpitta 2024-05-09 11:23:53 +02:00
parent 73bfc5865f
commit 3fce2928e2
2 changed files with 102 additions and 0 deletions
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97
isisd/isis_zebra.c
View File

@ -644,6 +644,40 @@ int isis_zebra_request_label_range(uint32_t base, uint32_t chunk_size)
return 0;
}
/**
* Request an End.X SID for an IS-IS adjacency.
*
* @param adj IS-IS Adjacency
*/
void isis_zebra_request_srv6_sid_endx(struct isis_adjacency *adj)
{
struct isis_circuit *circuit = adj->circuit;
struct isis_area *area = circuit->area;
struct in6_addr nexthop;
struct srv6_sid_ctx ctx = {};
struct in6_addr sid_value = {};
bool ret;
if (!area || !area->srv6db.srv6_locator)
return;
/* Determine nexthop IP address */
if (!circuit->ipv6_router || !adj->ll_ipv6_count)
return;
nexthop = adj->ll_ipv6_addrs[0];
ctx.behavior = ZEBRA_SEG6_LOCAL_ACTION_END_X;
ctx.nh6 = nexthop;
ret = isis_zebra_request_srv6_sid(&ctx, &sid_value,
area->srv6db.config.srv6_locator_name);
if (!ret) {
zlog_err("%s: not allocated new End.X SID for IS-IS area %s",
__func__, area->area_tag);
return;
}
}
/**
* Release Label Range to the Label Manager.
*
@ -1386,6 +1420,69 @@ int isis_zebra_srv6_manager_get_locator(const char *name)
return srv6_manager_get_locator(zclient, name);
}
/**
* Ask the SRv6 Manager (zebra) to allocate a SID.
*
* Optionally, it is possible to provide an IPv6 address (sid_value parameter).
*
* When sid_value is provided, the SRv6 Manager allocates the requested SID
* address, if the request can be satisfied (explicit allocation).
*
* When sid_value is not provided, the SRv6 Manager allocates any available SID
* from the provided locator (dynamic allocation).
*
* @param ctx Context to be associated with the request SID
* @param sid_value IPv6 address to be associated with the requested SID (optional)
* @param locator_name Name of the locator from which the SID must be allocated
*/
bool isis_zebra_request_srv6_sid(const struct srv6_sid_ctx *ctx,
struct in6_addr *sid_value,
const char *locator_name)
{
int ret;
if (!ctx || !locator_name)
return false;
/*
* Send the Get SRv6 SID request to the SRv6 Manager and check the
* result
*/
ret = srv6_manager_get_sid(zclient, ctx, sid_value, locator_name, NULL);
if (ret < 0) {
zlog_warn("%s: error getting SRv6 SID!", __func__);
return false;
}
return true;
}
/**
* Ask the SRv6 Manager (zebra) to release a previously allocated SID.
*
* This function is used to tell the SRv6 Manager that IS-IS no longer intends
* to use the SID.
*
* @param ctx Context to be associated with the SID to be released
*/
void isis_zebra_release_srv6_sid(const struct srv6_sid_ctx *ctx)
{
int ret;
if (!ctx)
return;
/*
* Send the Release SRv6 SID request to the SRv6 Manager and check the
* result
*/
ret = srv6_manager_release_sid(zclient, ctx);
if (ret < 0) {
zlog_warn("%s: error releasing SRv6 SID!", __func__);
return;
}
}
static zclient_handler *const isis_handlers[] = {
[ZEBRA_ROUTER_ID_UPDATE] = isis_router_id_update_zebra,
[ZEBRA_INTERFACE_ADDRESS_ADD] = isis_zebra_if_address_add,

5
isisd/isis_zebra.h
View File

@ -69,5 +69,10 @@ extern int isis_zebra_srv6_manager_get_locator_chunk(const char *name);
extern int isis_zebra_srv6_manager_release_locator_chunk(const char *name);
extern int isis_zebra_srv6_manager_get_locator(const char *name);
extern void isis_zebra_request_srv6_sid_endx(struct isis_adjacency *adj);
extern bool isis_zebra_request_srv6_sid(const struct srv6_sid_ctx *ctx,
struct in6_addr *sid_value,
const char *locator_name);
extern void isis_zebra_release_srv6_sid(const struct srv6_sid_ctx *ctx);
#endif /* _ZEBRA_ISIS_ZEBRA_H */