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/* $OpenBSD: carp.c,v 1.2 2006/01/26 09:53:46 moritz Exp $ */
/*
* Copyright (c) 2005 Håkan Olsson. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This code was written under funding by Multicom Security AB.
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netinet/ip_carp.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "sasyncd.h"
/* For some reason, ip_carp.h does not define this. */
#define CARP_INIT 0
#define CARP_BACKUP 1
#define CARP_MASTER 2
/* Returns 1 for the CARP MASTER, 0 for BACKUP/INIT, -1 on error. */
static enum RUNSTATE
carp_get_state(char *ifname)
{
struct ifreq ifr;
struct carpreq carp;
int s, saved_errno;
char *state;
if (!ifname || !*ifname) {
errno = ENOENT;
return FAIL;
}
memset(&ifr, 0, sizeof ifr);
strlcpy(ifr.ifr_name, ifname, sizeof ifr.ifr_name);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
return FAIL;
ifr.ifr_data = (caddr_t)&carp;
if (ioctl(s, SIOCGVH, (caddr_t)&ifr) == -1) {
saved_errno = errno;
close(s);
errno = saved_errno;
return FAIL;
}
close(s);
switch (carp.carpr_state) {
case CARP_INIT:
state = "INIT";
break;
case CARP_BACKUP:
state = "BACKUP";
break;
case CARP_MASTER:
state = "MASTER";
break;
default:
state = "<unknown>";
break;
}
log_msg(4, "carp_get_state: %s vhid %d state %s(%d)", ifname,
carp.carpr_vhid, state, carp.carpr_state);
if (carp.carpr_vhid > 0)
return carp.carpr_state == CARP_MASTER ? MASTER : SLAVE;
else
return FAIL;
}
void
carp_check_state(void)
{
enum RUNSTATE current_state = carp_get_state(cfgstate.carp_ifname);
static char *carpstate[] = CARPSTATES;
if (current_state < 0 || current_state > FAIL) {
log_err("carp_state_tracker: invalid result on interface "
"%s, abort", cfgstate.carp_ifname);
cfgstate.runstate = FAIL;
return;
}
if (current_state != cfgstate.runstate) {
log_msg(1, "carp_state_tracker: switching state to %s",
carpstate[current_state]);
cfgstate.runstate = current_state;
if (current_state == MASTER)
pfkey_set_promisc();
net_ctl_update_state();
}
}
static void
carp_state_tracker(void *v_arg)
{
static int failures = 0;
u_int32_t next_check;
carp_check_state();
if (cfgstate.runstate == FAIL)
if (++failures < 3)
log_err("carp_state_tracker");
if (failures > 5)
next_check = 600;
else
next_check = cfgstate.carp_check_interval + failures * 10;
if (timer_add("carp_state_tracker", next_check, carp_state_tracker,
NULL))
log_msg(0, "carp_state_tracker: failed to renew event");
return;
}
/* Initialize the CARP state tracker. */
int
carp_init(void)
{
enum RUNSTATE initial_state;
if (cfgstate.lockedstate != INIT) {
cfgstate.runstate = cfgstate.lockedstate;
log_msg(1, "carp_init: locking runstate to %s",
cfgstate.runstate == MASTER ? "MASTER" : "SLAVE");
return 0;
}
initial_state = carp_get_state(cfgstate.carp_ifname);
if (initial_state == FAIL) {
fprintf(stderr, "Failed to check interface \"%s\".\n",
cfgstate.carp_ifname);
fprintf(stderr, "Correct or manually select runstate.\n");
return -1;
}
return timer_add("carp_state_tracker", 0, carp_state_tracker, NULL);
}
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