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/*
* 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:
*/
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