<commit_before>/*
 * BSD interface driver for dhcpcd
 * Copyright (c) 2006-2017 <NAME> <<EMAIL>>
 * 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/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/utsname.h>

#include "config.h"

#include <arpa/inet.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/route.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#ifdef __DragonFly__
#  include <netproto/802_11/ieee80211_ioctl.h>
#elif __APPLE__
  /* FIXME: Add apple includes so we can work out SSID */
#else
#  include <net80211/ieee80211.h>
#  include <net80211/ieee80211_ioctl.h>
#endif

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <paths.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#if defined(OpenBSD) && OpenBSD >= 201411
/* OpenBSD dropped the global setting from sysctl but left the #define
 * which causes a EPERM error when trying to use it.
 * I think both the error and keeping the define are wrong, so we #undef it. */
#undef IPV6CTL_ACCEPT_RTADV
#endif

#include "common.h"
#include "dhcp.h"
#include "if.h"
#include "if-options.h"
#include "ipv4.h"
#include "ipv4ll.h"
#include "ipv6.h"
#include "ipv6nd.h"
#include "route.h"
#include "sa.h"

#ifndef RT_ROUNDUP
#define RT_ROUNDUP(a)							      \
	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len))
#endif

#ifdef INET6
static void
ifa_scope(struct sockaddr_in6 *, unsigned int);
#endif

struct priv {
	int pf_inet6_fd;
};

int
if_init(__unused struct interface *iface)
{
	/* BSD promotes secondary address by default */
	return 0;
}

int
if_conf(__unused struct interface *iface)
{
	/* No extra checks needed on BSD */
	return 0;
}

int
if_opensockets_os(struct dhcpcd_ctx *ctx)
{
	struct priv *priv;

	if ((priv = malloc(sizeof(*priv))) == NULL)
		return -1;
	ctx->priv = priv;

#ifdef INET6
	priv->pf_inet6_fd = xsocket(PF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0);
	/* Don't return an error so we at least work on kernels witout INET6
	 * even though we expect INET6 support.
	 * We will fail noisily elsewhere anyway. */
#else
	priv->pf_inet6_fd = -1;
#endif

#define SOCK_FLAGS	(SOCK_CLOEXEC | SOCK_NONBLOCK)
	ctx->link_fd = xsocket(PF_ROUTE, SOCK_RAW | SOCK_FLAGS, AF_UNSPEC);
#undef SOCK_FLAGS
	return ctx->link_fd == -1 ? -1 : 0;
}

void
if_closesockets_os(struct dhcpcd_ctx *ctx)
{
	struct priv *priv;

	priv = (struct priv *)ctx->priv;<commit_msg>if-bsd: support ROUTE_MSGFILTER socket option<commit_after>/*
 * BSD interface driver for dhcpcd
 * Copyright (c) 2006-2017 <NAME> <<EMAIL>>
 * 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/stat.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/uio.h>
#include <sys/utsname.h>

#include "config.h"

#include <arpa/inet.h>
#include <net/bpf.h>
#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_media.h>
#include <net/route.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#ifdef __DragonFly__
#  include <netproto/802_11/ieee80211_ioctl.h>
#elif __APPLE__
  /* FIXME: Add apple includes so we can work out SSID */
#else
#  include <net80211/ieee80211.h>
#  include <net80211/ieee80211_ioctl.h>
#endif

#include <assert.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <paths.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>

#if defined(OpenBSD) && OpenBSD >= 201411
/* OpenBSD dropped the global setting from sysctl but left the #define
 * which causes a EPERM error when trying to use it.
 * I think both the error and keeping the define are wrong, so we #undef it. */
#undef IPV6CTL_ACCEPT_RTADV
#endif

#include "common.h"
#include "dhcp.h"
#include "if.h"
#include "if-options.h"
#include "ipv4.h"
#include "ipv4ll.h"
#include "ipv6.h"
#include "ipv6nd.h"
#include "route.h"
#include "sa.h"

#ifndef RT_ROUNDUP
#define RT_ROUNDUP(a)							      \
	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define RT_ADVANCE(x, n) (x += RT_ROUNDUP((n)->sa_len))
#endif

#ifdef INET6
static void
ifa_scope(struct sockaddr_in6 *, unsigned int);
#endif

struct priv {
	int pf_inet6_fd;
};

int
if_init(__unused struct interface *iface)
{
	/* BSD promotes secondary address by default */
	return 0;
}

int
if_conf(__unused struct interface *iface)
{
	/* No extra checks needed on BSD */
	return 0;
}

int
if_opensockets_os(struct dhcpcd_ctx *ctx)
{
	struct priv *priv;
#ifdef ROUTE_MSGFILTER
	unsigned int msgfilter;
#endif

	if ((priv = malloc(sizeof(*priv))) == NULL)
		return -1;
	ctx->priv = priv;

#ifdef INET6
	priv->pf_inet6_fd = xsocket(PF_INET6, SOCK_DGRAM | SOCK_CLOEXEC, 0);
	/* Don't return an error so we at least work on kernels witout INET6
	 * even though we expect INET6 support.
	 * We will fail noisily elsewhere anyway. */
#else
	priv->pf_inet6_fd = -1;
#endif

#define SOCK_FLAGS	(SOCK_CLOEXEC | SOCK_NONBLOCK)
	ctx->link_fd = xsocket(PF_ROUTE, SOCK_RAW | SOCK_FLAGS, AF_UNSPEC);
#undef SOCK_FLAGS

#ifdef ROUTE_MSGFILTER
	msgfilter = ROUTE_FILTER(RTM_IFINFO)
#ifdef RTM_IFANNOUNCE
	    | ROUTE_FILTER(RTM_IFANNOUNCE)
#endif
	    | ROUTE_FILTER(RTM_ADD)
	    | ROUTE_FILTER(RTM_CHANGE)
	    | ROUTE_FILTER(RTM_DELETE)
#ifdef RTM_CHGADDR
	    | ROUTE_FILTER(RTM_CHGADDR)
#endif
	    | ROUTE_FILTER(RTM_DELADDR)
	    | ROUTE_FILTER(RTM_NEWADDR);
	if (setsockopt(ctx->link_fd, PF_ROUTE, ROUTE_MSGFILTER,
	    &msgfilter, sizeof(msgfilter)) == -1)
		syslog(LOG_ERR, "ROUTE_MSGFILTER: %m");
#endif

	return ctx->link_fd == -1 ? -1 : 0;
}

void
if_closesockets_os(struct dhcpcd_ctx *ctx)
{
	struct priv *priv;

	priv = (struct priv *)ctx->priv;
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