vrrp: add plugin providing vrrp support

Type: feature

Add a new plugin to support HA using VRRPv3 (RFC 5798).

Change-Id: Iaa2c37e6172f8f41e9165f178f44d481f6e247b9
Signed-off-by: Matthew Smith <mgsmith@netgate.com>

1 files changed, 58 insertions, 0 deletions

diff --git a/src/plugins/vrrp/vrrp_packet.h b/src/plugins/vrrp/vrrp_packet.h
new file mode 100644
index 00000000000..1cbf62d7c72
--- /dev/null
+++ b/src/plugins/vrrp/vrrp_packet.h
@@ -0,0 +1,58 @@
+
+/*
+ * vrrp_packet.h - vrrp protocol/packet definitions
+ *
+ * Copyright 2019-2020 Rubicon Communications, LLC (Netgate)
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ */
+#ifndef __included_vrrp_packet_h__
+#define __included_vrrp_packet_h__
+
+#include <vnet/vnet.h>
+
+typedef CLIB_PACKED (struct
+		     {
+		     /* 4 bits for version (always 2 or 3), 4 bits for type (always 1) */
+		     u8 vrrp_version_and_type;
+		     /* VR ID */
+		     u8 vr_id;
+		     /* priority of sender on this VR. value of 0 means a master is abdicating */
+		     u8 priority;
+		     /* count of addresses being backed up by the VR */
+		     u8 n_addrs;
+		     /* max advertisement interval - first 4 bits are reserved and must be 0 */
+		     u16 rsvd_and_max_adv_int;
+		     /* checksum */
+		     u16 checksum;
+		     }) vrrp_header_t;
+
+typedef CLIB_PACKED (struct
+		     {
+		     ip4_header_t ip4; vrrp_header_t vrrp;
+		     }) ip4_and_vrrp_header_t;
+
+typedef CLIB_PACKED (struct
+		     {
+		     ip6_header_t ip6; vrrp_header_t vrrp;
+		     }) ip6_and_vrrp_header_t;
+
+/* the high 4 bits of the advertisement interval are "reserved" and
+ * should be ignored on reception. swap byte order and mask out those bits.
+ */
+always_inline u16
+vrrp_adv_int_from_packet (vrrp_header_t * pkt)
+{
+  return clib_net_to_host_u16 (pkt->rsvd_and_max_adv_int) & ((u16) 0x0fff);
+}
+
+#endif /* __included_vrrp_packet_h__ */
+
+/*
+ * fd.io coding-style-patch-verification: ON
+ *
+ * Local Variables:
+ * eval: (c-set-style "gnu")
+ * End:
+ */