src/plugins/vrrp/vrrp_packet.h

   1
   2 /*
   3  * vrrp_packet.h - vrrp protocol/packet definitions
   4  *
   5  * Copyright 2019-2020 Rubicon Communications, LLC (Netgate)
   6  *
   7  * SPDX-License-Identifier: Apache-2.0
   8  *
   9  */
  10 #ifndef __included_vrrp_packet_h__
  11 #define __included_vrrp_packet_h__
  12
  13 #include <vnet/vnet.h>
  14
  15 typedef CLIB_PACKED (struct
  16                      {
  17                      /* 4 bits for version (always 2 or 3), 4 bits for type (always 1) */
  18                      u8 vrrp_version_and_type;
  19                      /* VR ID */
  20                      u8 vr_id;
  21                      /* priority of sender on this VR. value of 0 means a master is abdicating */
  22                      u8 priority;
  23                      /* count of addresses being backed up by the VR */
  24                      u8 n_addrs;
  25                      /* max advertisement interval - first 4 bits are reserved and must be 0 */
  26                      u16 rsvd_and_max_adv_int;
  27                      /* checksum */
  28                      u16 checksum;
  29                      }) vrrp_header_t;
  30
  31 typedef CLIB_PACKED (struct
  32                      {
  33                      ip4_header_t ip4; vrrp_header_t vrrp;
  34                      }) ip4_and_vrrp_header_t;
  35
  36 typedef CLIB_PACKED (struct
  37                      {
  38                      ip6_header_t ip6; vrrp_header_t vrrp;
  39                      }) ip6_and_vrrp_header_t;
  40
  41 /* the high 4 bits of the advertisement interval are "reserved" and
  42  * should be ignored on reception. swap byte order and mask out those bits.
  43  */
  44 always_inline u16
  45 vrrp_adv_int_from_packet (vrrp_header_t * pkt)
  46 {
  47   return clib_net_to_host_u16 (pkt->rsvd_and_max_adv_int) & ((u16) 0x0fff);
  48 }
  49
  50 #endif /* __included_vrrp_packet_h__ */
  51
  52 /*
  53  * fd.io coding-style-patch-verification: ON
  54  *
  55  * Local Variables:
  56  * eval: (c-set-style "gnu")
  57  * End:
  58  */