Adding upstream version 9.1.upstream/9.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 114 insertions, 0 deletions

diff --git a/zebra/label_manager.h b/zebra/label_manager.h
new file mode 100644
index 0000000..74f40fa
--- /dev/null
+++ b/zebra/label_manager.h
@@ -0,0 +1,114 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * Label Manager header
+ *
+ * Copyright (C) 2017 by Bingen Eguzkitza,
+ *                       Volta Networks Inc.
+ *
+ * This file is part of FRRouting (FRR)
+ */
+
+#ifndef _LABEL_MANAGER_H
+#define _LABEL_MANAGER_H
+
+#include <stdint.h>
+
+#include "lib/linklist.h"
+#include "frrevent.h"
+#include "lib/hook.h"
+
+#include "zebra/zserv.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NO_PROTO 0
+
+/*
+ * Label chunk struct
+ * Client daemon which the chunk belongs to can be identified by a tuple of:
+ * proto (daemon protocol) + instance + zapi session_id
+ * If the client then passes a non-empty value to keep field when it requests
+ * for chunks, the chunks won't be garbage collected and the client will be
+ * responsible for releasing them.
+ * Otherwise, if the keep field is not set (value 0) for the chunk, it will be
+ * automatically released when the client disconnects or when it reconnects
+ * (in case it died unexpectedly, we can know it's the same because it will have
+ * the same proto+instance+session values)
+ */
+struct label_manager_chunk {
+	uint8_t proto;
+	unsigned short instance;
+	uint32_t session_id;
+	uint8_t keep;
+	uint32_t start; /* First label of the chunk */
+	uint32_t end;   /* Last label of the chunk */
+};
+
+/* declare hooks for the basic API, so that it can be specialized or served
+ * externally. Also declare a hook when those functions have been registered,
+ * so that any external module wanting to replace those can react
+ */
+
+DECLARE_HOOK(lm_client_connect, (struct zserv *client, vrf_id_t vrf_id),
+	     (client, vrf_id));
+DECLARE_HOOK(lm_client_disconnect, (struct zserv *client), (client));
+DECLARE_HOOK(lm_get_chunk,
+	     (struct label_manager_chunk * *lmc, struct zserv *client,
+	      uint8_t keep, uint32_t size, uint32_t base, vrf_id_t vrf_id),
+	     (lmc, client, keep, size, base, vrf_id));
+DECLARE_HOOK(lm_release_chunk,
+	     (struct zserv *client, uint32_t start, uint32_t end),
+	     (client, start, end));
+DECLARE_HOOK(lm_cbs_inited, (), ());
+
+
+/* declare wrappers to be called in zapi_msg.c (as hooks must be called in
+ * source file where they were defined)
+ */
+void lm_client_connect_call(struct zserv *client, vrf_id_t vrf_id);
+void lm_get_chunk_call(struct label_manager_chunk **lmc, struct zserv *client,
+		       uint8_t keep, uint32_t size, uint32_t base,
+		       vrf_id_t vrf_id);
+void lm_release_chunk_call(struct zserv *client, uint32_t start,
+			   uint32_t end);
+
+/* API for an external LM to return responses for requests */
+int lm_client_connect_response(uint8_t proto, uint16_t instance,
+			       uint32_t session_id, vrf_id_t vrf_id,
+			       uint8_t result);
+
+/* convenience function to allocate an lmc to be consumed by the above API */
+struct label_manager_chunk *
+create_label_chunk(uint8_t proto, unsigned short instance, uint32_t session_id,
+		   uint8_t keep, uint32_t start, uint32_t end);
+void delete_label_chunk(void *val);
+
+/* register/unregister callbacks for hooks */
+void lm_hooks_register(void);
+void lm_hooks_unregister(void);
+
+/*
+ * Main label manager struct
+ * Holds a linked list of label chunks.
+ */
+struct label_manager {
+	struct list *lc_list;
+};
+
+void label_manager_init(void);
+struct label_manager_chunk *
+assign_label_chunk(uint8_t proto, unsigned short instance, uint32_t session_id,
+		   uint8_t keep, uint32_t size, uint32_t base);
+int release_label_chunk(uint8_t proto, unsigned short instance,
+			uint32_t session_id, uint32_t start, uint32_t end);
+int lm_client_disconnect_cb(struct zserv *client);
+int release_daemon_label_chunks(struct zserv *client);
+void label_manager_close(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LABEL_MANAGER_H */