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/*
* dhcpcd - DHCP client daemon
* Copyright (c) 2006-2014 Roy Marples <roy@marples.name>
* 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
*/
#include <sys/ioctl.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/utsname.h>
#include <net/if.h>
#ifdef __FreeBSD__ /* Needed so that including netinet6/in6_var.h works */
# include <net/if_var.h>
#endif
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "common.h"
#include "dhcpcd.h"
#include "if-options.h"
#include "platform.h"
#ifndef SYS_NMLN /* OSX */
# define SYS_NMLN 256
#endif
static char march[SYS_NMLN];
char *
hardware_platform(void)
{
int mib[2] = { CTL_HW, HW_MACHINE_ARCH };
size_t len = sizeof(march);
if (sysctl(mib, sizeof(mib) / sizeof(mib[0]),
march, &len, NULL, 0) != 0)
return NULL;
return march;
}
#ifdef INET6
#define get_inet6_sysctl(code) inet6_sysctl(code, 0, 0)
#define set_inet6_sysctl(code, val) inet6_sysctl(code, val, 1)
static int
inet6_sysctl(int code, int val, int action)
{
int mib[] = { CTL_NET, PF_INET6, IPPROTO_IPV6, 0 };
size_t size;
mib[3] = code;
size = sizeof(val);
if (action) {
if (sysctl(mib, sizeof(mib)/sizeof(mib[0]),
NULL, 0, &val, size) == -1)
return -1;
return 0;
}
if (sysctl(mib, sizeof(mib)/sizeof(mib[0]), &val, &size, NULL, 0) == -1)
return -1;
return val;
}
static void
restore_kernel_ra(void)
{
if (options & DHCPCD_FORKED)
return;
syslog(LOG_INFO, "restoring Kernel IPv6 RA support");
if (set_inet6_sysctl(IPV6CTL_ACCEPT_RTADV, 1) == -1)
syslog(LOG_ERR, "IPV6CTL_ACCEPT_RTADV: %m");
}
static int
ipv6_ra_flush(void)
{
int s;
char dummy[IFNAMSIZ + 8];
s = socket(AF_INET6, SOCK_DGRAM, 0);
if (s == -1)
return -1;
strcpy(dummy, "lo0");
if (ioctl(s, SIOCSRTRFLUSH_IN6, (caddr_t)&dummy) == -1)
syslog(LOG_ERR, "SIOSRTRFLUSH_IN6: %m");
if (ioctl(s, SIOCSPFXFLUSH_IN6, (caddr_t)&dummy) == -1)
syslog(LOG_ERR, "SIOSPFXFLUSH_IN6: %m");
close(s);
return 0;
}
int
check_ipv6(const char *ifname, int own)
{
static int set_restore = 0, global_ra = 0;
int ra;
/* BSD doesn't support these values per iface, so just return
* the global ra setting */
if (ifname)
return global_ra;
ra = get_inet6_sysctl(IPV6CTL_ACCEPT_RTADV);
if (ra == -1)
/* The sysctl probably doesn't exist, but this isn't an
* error as such so just log it and continue */
syslog(errno == ENOENT ? LOG_DEBUG : LOG_WARNING,
"IPV6CTL_ACCEPT_RTADV: %m");
else if (ra != 0 && own) {
syslog(LOG_INFO, "disabling Kernel IPv6 RA support");
if (set_inet6_sysctl(IPV6CTL_ACCEPT_RTADV, 0) == -1) {
syslog(LOG_ERR, "IPV6CTL_ACCEPT_RTADV: %m");
return ra;
}
if (!set_restore) {
set_restore = 1;
atexit(restore_kernel_ra);
}
ra = 0;
/* Flush the kernel knowledge of advertised routers
* and prefixes so the kernel does not expire prefixes
* and default routes we are trying to own. */
ipv6_ra_flush();
}
if (ifname == NULL)
global_ra = ra;
return ra;
}
int
ipv6_dadtransmits(__unused const char *ifname)
{
int r;
r = get_inet6_sysctl(IPV6CTL_DAD_COUNT);
return r < 0 ? 0 : r;
}
#endif
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