zebra: Notify daemons about SIDs

Send asynchronous notifications to zclients when an SRv6 SID is
allocated/released and when a SID alloc/release operation fails.

Signed-off-by: Carmine Scarpitta <cscarpit@cisco.com>

3 files changed, 60 insertions, 0 deletions

diff --git a/zebra/zapi_msg.c b/zebra/zapi_msg.c
index bab4c4fa3d..164c0dd687 100644
--- a/zebra/zapi_msg.c
+++ b/zebra/zapi_msg.c
@@ -999,6 +999,39 @@ void zsend_neighbor_notify(int cmd, struct interface *ifp,
 	}
 }
 
+void zsend_srv6_sid_notify(struct zserv *client, const struct srv6_sid_ctx *ctx,
+			   struct in6_addr *sid_value, uint32_t func,
+			   uint32_t wide_func, enum zapi_srv6_sid_notify note)
+{
+	struct stream *s;
+	uint16_t cmd = ZEBRA_SRV6_SID_NOTIFY;
+	char buf[256];
+
+	if (IS_ZEBRA_DEBUG_PACKET)
+		zlog_debug("%s: notifying %s ctx %s sid %pI6 note %s (proto=%u, instance=%u, sessionId=%u)",
+			   __func__, zserv_command_string(cmd),
+			   srv6_sid_ctx2str(buf, sizeof(buf), ctx), sid_value,
+			   zapi_srv6_sid_notify2str(note), client->proto,
+			   client->instance, client->session_id);
+
+	s = stream_new(ZEBRA_MAX_PACKET_SIZ);
+
+	zclient_create_header(s, cmd, VRF_DEFAULT);
+	/* Notification type (e.g. ZAPI_SRV6_SID_ALLOCATED, ZAPI_SRV6_SID_FAIL_ALLOC, ...) */
+	stream_put(s, &note, sizeof(note));
+	/* Context associated with the SRv6 SID */
+	stream_put(s, ctx, sizeof(struct srv6_sid_ctx));
+	/* SRv6 SID value (i.e. IPv6 address) */
+	stream_put(s, sid_value, sizeof(struct in6_addr));
+	/* SRv6 SID function */
+	stream_putl(s, func);
+	/* SRv6 wide SID function */
+	stream_putl(s, wide_func);
+	stream_putw_at(s, 0, stream_get_endp(s));
+
+	zserv_send_message(client, s);
+}
+
 
 /* Router-id is updated. Send ZEBRA_ROUTER_ID_UPDATE to client. */
 int zsend_router_id_update(struct zserv *client, afi_t afi, struct prefix *p,
diff --git a/zebra/zapi_msg.h b/zebra/zapi_msg.h
index c7123e2593..3505bc0dc4 100644
--- a/zebra/zapi_msg.h
+++ b/zebra/zapi_msg.h
@@ -94,6 +94,11 @@ extern int zsend_sr_policy_notify_status(uint32_t color,
 extern void zsend_neighbor_notify(int cmd, struct interface *ifp,
 				  struct ipaddr *ipaddr, int ndm_state,
 				  union sockunion *link_layer_ipv4, int ip_len);
+extern void zsend_srv6_sid_notify(struct zserv *client,
+				  const struct srv6_sid_ctx *ctx,
+				  struct in6_addr *sid_value, uint32_t func,
+				  uint32_t wide_func,
+				  enum zapi_srv6_sid_notify note);
 
 extern int zsend_client_close_notify(struct zserv *client,
 				     struct zserv *closed_client);
diff --git a/zebra/zebra_srv6.c b/zebra/zebra_srv6.c
index d93f09f1b4..663afa2f85 100644
--- a/zebra/zebra_srv6.c
+++ b/zebra/zebra_srv6.c
@@ -2279,6 +2279,8 @@ static int srv6_manager_get_sid_internal(struct zebra_srv6_sid **sid,
 					 const char *locator_name)
 {
 	int ret = -1;
+	struct listnode *node;
+	struct zserv *c;
 	char buf[256];
 
 	if (IS_ZEBRA_DEBUG_PACKET)
@@ -2291,6 +2293,10 @@ static int srv6_manager_get_sid_internal(struct zebra_srv6_sid **sid,
 		zlog_warn("%s: not got SRv6 SID for ctx %s, sid_value=%pI6, locator_name=%s",
 			  __func__, srv6_sid_ctx2str(buf, sizeof(buf), ctx),
 			  sid_value, locator_name);
+
+		/* Notify client about SID alloc failure */
+		zsend_srv6_sid_notify(client, ctx, NULL, 0, 0,
+				      ZAPI_SRV6_SID_FAIL_ALLOC);
 	} else if (ret == 0) {
 		if (IS_ZEBRA_DEBUG_PACKET)
 			zlog_debug("%s: got existing SRv6 SID for ctx %s: sid_value=%pI6 (func=%u) (proto=%u, instance=%u, sessionId=%u), notify client",
@@ -2300,6 +2306,10 @@ static int srv6_manager_get_sid_internal(struct zebra_srv6_sid **sid,
 				   client->instance, client->session_id);
 		if (!listnode_lookup((*sid)->client_list, client))
 			listnode_add((*sid)->client_list, client);
+
+		zsend_srv6_sid_notify(client, ctx, &(*sid)->value, (*sid)->func,
+				      (*sid)->wide_func,
+				      ZAPI_SRV6_SID_ALLOCATED);
 	} else {
 		if (IS_ZEBRA_DEBUG_PACKET)
 			zlog_debug("%s: got new SRv6 SID for ctx %s: sid_value=%pI6 (func=%u) (proto=%u, instance=%u, sessionId=%u), notifying all clients",
@@ -2309,6 +2319,11 @@ static int srv6_manager_get_sid_internal(struct zebra_srv6_sid **sid,
 				   client->instance, client->session_id);
 		if (!listnode_lookup((*sid)->client_list, client))
 			listnode_add((*sid)->client_list, client);
+
+		for (ALL_LIST_ELEMENTS_RO((*sid)->client_list, node, c))
+			zsend_srv6_sid_notify(c, ctx, &(*sid)->value,
+					      (*sid)->func, (*sid)->wide_func,
+					      ZAPI_SRV6_SID_ALLOCATED);
 	}
 
 	return ret;
@@ -2382,6 +2397,13 @@ static int srv6_manager_release_sid_internal(struct zserv *client,
 		zlog_debug("%s: no SID associated with ctx %s", __func__,
 			   srv6_sid_ctx2str(buf, sizeof(buf), ctx));
 
+	if (ret == 0)
+		zsend_srv6_sid_notify(client, ctx, NULL, 0, 0,
+				      ZAPI_SRV6_SID_RELEASED);
+	else
+		zsend_srv6_sid_notify(client, ctx, NULL, 0, 0,
+				      ZAPI_SRV6_SID_FAIL_RELEASE);
+
 	return ret;
 }