vrrpd: initial commit

Signed-off-by: Quentin Young <qlyoung@cumulusnetworks.com>

1 files changed, 162 insertions, 0 deletions

diff --git a/vrrpd/vrrp.h b/vrrpd/vrrp.h
new file mode 100644
index 0000000000..308e3a8e10
--- /dev/null
+++ b/vrrpd/vrrp.h
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+/*
+ * VRRPD global definitions
+ * Copyright (C) 2018 Cumulus Networks, Inc.
+ *               Quentin Young
+ *
+ * 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 __VRRP_H__
+#define __VRRP_H_
+
+#include <zebra.h>
+#include "linklist.h"
+#include "hash.h"
+#include "if.h"
+#include "thread.h"
+#include "hook.h"
+
+/* Global definitions */
+#define VRRP_DEFAULT_ADVINT 100
+#define VRRP_DEFAULT_PRIORITY 100
+#define VRRP_PRIO_MASTER 255
+#define VRRP_MCAST_GROUP "224.0.0.18"
+#define VRRP_MCAST_GROUP_HEX 0xe0000012
+#define IPPROTO_VRRP 112
+
+/* threadmaster */
+extern struct thread_master *master;
+
+/* Global hash of all Virtual Routers */
+struct hash *vrrp_vrouters_hash;
+
+/*
+ * VRRP Virtual Router
+ */
+struct vrrp_vrouter {
+	/* Socket */
+	int sock;
+
+	/* Interface */
+	struct interface *ifp;
+
+	/* Virtual Router Identifier */
+	uint32_t vrid;
+
+	/* One or more IPv4 addresses associated with this Virtual Router. */
+	struct list *v4;
+
+	/*
+	 * One ore more IPv6 addresses associated with this Virtual Router. The
+	 * first address must be the Link-Local address associated with the
+	 * virtual router.
+	 */
+	struct list *v6;
+
+	/* Time between ADVERTISEMENTS (centiseconds) */
+	int advint;
+
+	/* Whether this VRRP Router is currently the master */
+	bool is_master;
+
+	/* Priority */
+	uint8_t priority;
+
+	/*
+	 * Time interval between ADVERTISEMENTS (centiseconds). Default is 100
+	 * centiseconds (1 second).
+	 */
+	uint16_t advertisement_interval;
+	/*
+	 * Advertisement interval contained in ADVERTISEMENTS received from the
+	 * Master (centiseconds)
+	 */
+	uint16_t master_adver_interval;
+
+	/*
+	 * Time to skew Master_Down_Interval in centiseconds. Calculated as:
+	 * (((256 - priority) * Master_Adver_Interval) / 256)
+	 */
+	uint16_t skew_time;
+
+	/*
+	 * Time interval for Backup to declare Master down (centiseconds).
+	 * Calculated as:
+	 * (3 * Master_Adver_Interval) + Skew_time
+	 */
+	uint16_t master_down_interval;
+
+	/*
+	 * Controls whether a (starting or restarting) higher-priority Backup
+	 * router preempts a lower-priority Master router. Values are True to
+	 * allow preemption and False to prohibit preemption. Default is True.
+	 */
+	bool preempt_mode;
+
+	/*
+	 * Controls whether a virtual router in Master state will accept
+	 * packets addressed to the address owner's IPvX address as its own if
+	 * it is not the IPvX address owner. The default is False.
+	 */
+	bool accept_mode;
+
+	/*
+	 * The MAC address used for the source MAC address in VRRP
+	 * advertisements and advertised in ARP responses as the MAC address to
+	 * use for IP_Addresses.
+	 */
+	struct ethaddr vr_mac_v4;
+	struct ethaddr vr_mac_v6;
+
+	struct thread *t_master_down_timer;
+	struct thread *t_adver_timer;
+
+	struct {
+		int state;
+	} fsm;
+};
+
+/* State machine */
+#define VRRP_STATE_INITIALIZE 1
+#define VRRP_STATE_MASTER 2
+#define VRRP_STATE_BACKUP 3
+#define VRRP_EVENT_STARTUP 1
+#define VRRP_EVENT_SHUTDOWN 2
+
+DECLARE_HOOK(vrrp_change_state_hook, (struct vrrp_vrouter *vr, int to), (vr, to));
+void vrrp_event(struct vrrp_vrouter *vr, int event);
+/* End state machine */
+
+
+/*
+ * Initialize VRRP global datastructures.
+ */
+void vrrp_init(void);
+
+/*
+ * Create and register a new VRRP Virtual Router.
+ */
+struct vrrp_vrouter *vrrp_vrouter_create(struct interface *ifp, uint8_t vrid);
+
+/*
+ * Find VRRP Virtual Router by Virtual Router ID
+ */
+struct vrrp_vrouter *vrrp_lookup(uint8_t vrid);
+
+/*
+ * Trigger VRRP event
+ */
+void vrrp_event(struct vrrp_vrouter *vr, int event);
+
+#endif