lib: adding support for LDP IGP Sync feature

Signed-off-by: Lynne Morrison <lynne@voltanet.io>
Signed-off-by: Karen Schoener <karen@voltanet.io>

1 files changed, 91 insertions, 0 deletions

diff --git a/lib/ldp_sync.h b/lib/ldp_sync.h
new file mode 100644
index 0000000000..daede566f0
--- /dev/null
+++ b/lib/ldp_sync.h
@@ -0,0 +1,91 @@
+/*
+ * Defines and structures common to LDP-Sync for OSPFv2 and OSPFv3 and ISIS
+ * Copyright (C) 2020 Volta Networks, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _LIBLDPSYNC_H
+#define _LIBLDPSYNC_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* LDP-IGP Sync values */
+#define LDP_SYNC_FLAG_ENABLE     (1 << 0) /* LDP-SYNC enabled */
+#define LDP_SYNC_FLAG_HOLDDOWN   (1 << 1) /* Holddown timer enabled */
+#define LDP_SYNC_FLAG_IF_CONFIG  (1 << 2) /* LDP-SYNC enabled on interface */
+#define LDP_SYNC_FLAG_SET_METRIC (1 << 3) /* Metric has been set on ISIS intf */
+
+#define LDP_IGP_SYNC_DEFAULT        0
+#define LDP_IGP_SYNC_ENABLED        1
+
+#define LDP_IGP_SYNC_STATE_NOT_REQUIRED     0
+#define LDP_IGP_SYNC_STATE_REQUIRED_NOT_UP  1
+#define LDP_IGP_SYNC_STATE_REQUIRED_UP      2
+
+#define LDP_IGP_SYNC_HOLDDOWN_DEFAULT 0
+
+#define LDP_IGP_SYNC_HELLO_TIMEOUT 1
+
+/* LDP-IGP Sync structures */
+struct ldp_sync_info_cmd {
+	uint16_t flags;
+	uint16_t holddown;       /* timer value */
+	uint32_t sequence;       /* hello sequence number */
+	struct thread *t_hello;  /* hello timer for detecting LDP going down */
+};
+
+struct ldp_sync_info {
+	uint16_t flags;          /* indicate if set on interface or globally */
+	uint8_t enabled;         /* enabled */
+	uint8_t state;           /* running state */
+	uint16_t holddown;       /* timer value */
+	struct thread *t_holddown; /* holddown timer*/
+	uint32_t metric[2];      /* isis interface metric */
+};
+
+/* Prototypes. */
+extern struct ldp_sync_info *ldp_sync_info_create(void);
+extern bool ldp_sync_if_is_enabled(struct ldp_sync_info *ldp_sync_info);
+extern bool ldp_sync_if_down(struct ldp_sync_info *ldp_sync_info);
+extern void ldp_sync_info_free(struct ldp_sync_info **ldp_sync_info);
+
+struct ldp_igp_sync_announce {
+	int proto;
+};
+
+struct ldp_igp_sync_if_state {
+	ifindex_t ifindex;
+	bool sync_start;
+};
+
+struct ldp_igp_sync_if_state_req {
+	int proto;
+	ifindex_t ifindex;
+	char name[INTERFACE_NAMSIZ];
+};
+
+struct ldp_igp_sync_hello {
+	int proto;
+	unsigned int sequence;
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _LIBLDPSYNC_H */