vrrpd/vrrp_packet.c

   1 /*
   2  * VRRPD packet crafting
   3  * Copyright (C) 2018 Cumulus Networks, Inc.
   4  *               Quentin Young
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License as published by the Free
   8  * Software Foundation; either version 2 of the License, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  14  * more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; see the file COPYING; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20 #include <zebra.h>
  21
  22 #include "memory.h"
  23 #include "ipaddr.h"
  24
  25 #include "vrrp_packet.h"
  26
  27 /*
  28  * Builds a VRRP packet.
  29  */
  30 struct vrrp_pkt *vrrp_pkt_build(uint8_t vrid, uint8_t prio,
  31                                 uint16_t max_adver_int, bool v6, uint8_t numip,
  32                                 void **ips)
  33 {
  34         size_t addrsz = v6 ? sizeof(struct in6_addr) : sizeof(struct in_addr);
  35         struct vrrp_pkt *pkt =
  36                 XCALLOC(MTYPE_TMP, sizeof(struct vrrp_pkt) + addrsz * numip);
  37
  38         pkt->version = VRRP_VERSION;
  39         pkt->type = VRRP_TYPE_ADVERTISEMENT;
  40         pkt->vrid = vrid;
  41         pkt->priority = prio;
  42         pkt->rsvd = 0;
  43         pkt->max_adver_int = max_adver_int;
  44         for (uint8_t i = 0; i < numip; i++)
  45                 memcpy(&pkt->addrs[i].v4, ips[i], addrsz);
  46         /* FIXME */
  47         pkt->cksum = 0;
  48
  49         return pkt;
  50 }