[mirror_frr.git] / zebra / if_ioctl.c

/*
 * Interface looking up by ioctl ().
 * Copyright (C) 1997, 98 Kunihiro Ishiguro
 *
 * This file is part of GNU Zebra.
 *
 * GNU Zebra is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * GNU Zebra is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; see the file COPYING; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <zebra.h>

#include "if.h"
#include "sockunion.h"
#include "prefix.h"
#include "ioctl.h"
#include "connected.h"
#include "memory.h"
#include "zebra_memory.h"
#include "log.h"
#include "vrf.h"
#include "vty.h"

#include "zebra/interface.h"
#include "zebra/rib.h"

#include <ifaddrs.h>

/* Interface looking up using infamous SIOCGIFCONF. */
static int interface_list_ioctl(void)
{
	int ret;
	int sock;
#define IFNUM_BASE 32
	int ifnum;
	struct ifreq *ifreq;
	struct ifconf ifconf;
	struct interface *ifp;
	int n;
	int lastlen;

	/* Normally SIOCGIFCONF works with AF_INET socket. */
	sock = socket(AF_INET, SOCK_DGRAM, 0);
	if (sock < 0) {
		zlog_warn("Can't make AF_INET socket stream: %s",
			  safe_strerror(errno));
		return -1;
	}

/* Set initial ifreq count.  This will be double when SIOCGIFCONF
   fail.  Solaris has SIOCGIFNUM. */
#ifdef SIOCGIFNUM
	ret = ioctl(sock, SIOCGIFNUM, &ifnum);
	if (ret < 0)
		ifnum = IFNUM_BASE;
	else
		ifnum++;
#else
	ifnum = IFNUM_BASE;
#endif /* SIOCGIFNUM */

	ifconf.ifc_buf = NULL;

	lastlen = 0;
	/* Loop until SIOCGIFCONF success. */
	for (;;) {
		ifconf.ifc_len = sizeof(struct ifreq) * ifnum;
		ifconf.ifc_buf =
			XREALLOC(MTYPE_TMP, ifconf.ifc_buf, ifconf.ifc_len);

		ret = ioctl(sock, SIOCGIFCONF, &ifconf);

		if (ret < 0) {
			zlog_warn("SIOCGIFCONF: %s", safe_strerror(errno));
			goto end;
		}
		/* Repeatedly get info til buffer fails to grow. */
		if (ifconf.ifc_len > lastlen) {
			lastlen = ifconf.ifc_len;
			ifnum += 10;
			continue;
		}
		/* Success. */
		break;
	}

	/* Allocate interface. */
	ifreq = ifconf.ifc_req;

#ifdef OPEN_BSD
	for (n = 0; n < ifconf.ifc_len;) {
		unsigned int size;

		ifreq = (struct ifreq *)((caddr_t)ifconf.ifc_req + n);
		ifp = if_get_by_name_len(
			ifreq->ifr_name,
			strnlen(ifreq->ifr_name, sizeof(ifreq->ifr_name)),
			VRF_DEFAULT, 0);
		if_add_update(ifp);
		size = ifreq->ifr_addr.sa_len;
		if (size < sizeof(ifreq->ifr_addr))
			size = sizeof(ifreq->ifr_addr);
		size += sizeof(ifreq->ifr_name);
		n += size;
	}
#else
	for (n = 0; n < ifconf.ifc_len; n += sizeof(struct ifreq)) {
		ifp = if_get_by_name_len(
			ifreq->ifr_name,
			strnlen(ifreq->ifr_name, sizeof(ifreq->ifr_name)),
			VRF_DEFAULT, 0);
		if_add_update(ifp);
		ifreq++;
	}
#endif /* OPEN_BSD */

end:
	close(sock);
	XFREE(MTYPE_TMP, ifconf.ifc_buf);

	return ret;
}

/* Get interface's index by ioctl. */
static int if_get_index(struct interface *ifp)
{
	ifp->ifindex = if_nametoindex(ifp->name);
	return ifp->ifindex;
}

#ifdef SIOCGIFHWADDR
static int if_get_hwaddr(struct interface *ifp)
{
	int ret;
	struct ifreq ifreq;
	int i;

	strncpy(ifreq.ifr_name, ifp->name, IFNAMSIZ);
	ifreq.ifr_addr.sa_family = AF_INET;

	/* Fetch Hardware address if available. */
	ret = if_ioctl(SIOCGIFHWADDR, (caddr_t)&ifreq);
	if (ret < 0)
		ifp->hw_addr_len = 0;
	else {
		memcpy(ifp->hw_addr, ifreq.ifr_hwaddr.sa_data, 6);

		for (i = 0; i < 6; i++)
			if (ifp->hw_addr[i] != 0)
				break;

		if (i == 6)
			ifp->hw_addr_len = 0;
		else
			ifp->hw_addr_len = 6;
	}
	return 0;
}
#endif /* SIOCGIFHWADDR */

static int if_getaddrs(void)
{
	int ret;
	struct ifaddrs *ifap;
	struct ifaddrs *ifapfree;
	struct interface *ifp;
	int prefixlen;

	ret = getifaddrs(&ifap);
	if (ret != 0) {
		zlog_err("getifaddrs(): %s", safe_strerror(errno));
		return -1;
	}

	for (ifapfree = ifap; ifap; ifap = ifap->ifa_next) {
		if (ifap->ifa_addr == NULL) {
			zlog_err(
				"%s: nonsensical ifaddr with NULL ifa_addr, ifname %s",
				__func__,
				(ifap->ifa_name ? ifap->ifa_name : "(null)"));
			continue;
		}

		ifp = if_lookup_by_name(ifap->ifa_name, VRF_DEFAULT);
		if (ifp == NULL) {
			zlog_err("if_getaddrs(): Can't lookup interface %s\n",
				 ifap->ifa_name);
			continue;
		}

		if (ifap->ifa_addr->sa_family == AF_INET) {
			struct sockaddr_in *addr;
			struct sockaddr_in *mask;
			struct sockaddr_in *dest;
			struct in_addr *dest_pnt;
			int flags = 0;

			addr = (struct sockaddr_in *)ifap->ifa_addr;
			mask = (struct sockaddr_in *)ifap->ifa_netmask;
			prefixlen = ip_masklen(mask->sin_addr);

			dest_pnt = NULL;

			if (ifap->ifa_dstaddr
			    && !IPV4_ADDR_SAME(&addr->sin_addr,
					       &((struct sockaddr_in *)
							 ifap->ifa_dstaddr)
							->sin_addr)) {
				dest = (struct sockaddr_in *)ifap->ifa_dstaddr;
				dest_pnt = &dest->sin_addr;
				flags = ZEBRA_IFA_PEER;
			} else if (ifap->ifa_broadaddr
				   && !IPV4_ADDR_SAME(
					      &addr->sin_addr,
					      &((struct sockaddr_in *)
							ifap->ifa_broadaddr)
						       ->sin_addr)) {
				dest = (struct sockaddr_in *)
					       ifap->ifa_broadaddr;
				dest_pnt = &dest->sin_addr;
			}

			connected_add_ipv4(ifp, flags, &addr->sin_addr,
					   prefixlen, dest_pnt, NULL);
		}
		if (ifap->ifa_addr->sa_family == AF_INET6) {
			struct sockaddr_in6 *addr;
			struct sockaddr_in6 *mask;
			struct sockaddr_in6 *dest;
			struct in6_addr *dest_pnt;
			int flags = 0;

			addr = (struct sockaddr_in6 *)ifap->ifa_addr;
			mask = (struct sockaddr_in6 *)ifap->ifa_netmask;
			prefixlen = ip6_masklen(mask->sin6_addr);

			dest_pnt = NULL;

			if (ifap->ifa_dstaddr
			    && !IPV6_ADDR_SAME(&addr->sin6_addr,
					       &((struct sockaddr_in6 *)
							 ifap->ifa_dstaddr)
							->sin6_addr)) {
				dest = (struct sockaddr_in6 *)ifap->ifa_dstaddr;
				dest_pnt = &dest->sin6_addr;
				flags = ZEBRA_IFA_PEER;
			} else if (ifap->ifa_broadaddr
				   && !IPV6_ADDR_SAME(
					      &addr->sin6_addr,
					      &((struct sockaddr_in6 *)
							ifap->ifa_broadaddr)
						       ->sin6_addr)) {
				dest = (struct sockaddr_in6 *)
					       ifap->ifa_broadaddr;
				dest_pnt = &dest->sin6_addr;
			}

#if defined(KAME)
			if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
				addr->sin6_scope_id =
					ntohs(*(u_int16_t *)&addr->sin6_addr
						       .s6_addr[2]);
				addr->sin6_addr.s6_addr[2] =
					addr->sin6_addr.s6_addr[3] = 0;
			}
#endif

			connected_add_ipv6(ifp, flags, &addr->sin6_addr,
					   prefixlen, dest_pnt, NULL);
		}
	}

	freeifaddrs(ifapfree);

	return 0;
}

/* Fetch interface information via ioctl(). */
static void interface_info_ioctl()
{
	struct listnode *node, *nnode;
	struct interface *ifp;

	for (ALL_LIST_ELEMENTS(vrf_iflist(VRF_DEFAULT), node, nnode, ifp)) {
		if_get_index(ifp);
#ifdef SIOCGIFHWADDR
		if_get_hwaddr(ifp);
#endif /* SIOCGIFHWADDR */
		if_get_flags(ifp);
		if_get_mtu(ifp);
		if_get_metric(ifp);
	}
}

/* Lookup all interface information. */
void interface_list(struct zebra_ns *zns)
{

	zlog_info("interface_list: NS %u", zns->ns_id);

/* Linux can do both proc & ioctl, ioctl is the only way to get
   interface aliases in 2.2 series kernels. */
#ifdef HAVE_PROC_NET_DEV
	interface_list_proc();
#endif /* HAVE_PROC_NET_DEV */
	interface_list_ioctl();

	/* After listing is done, get index, address, flags and other
	   interface's information. */
	interface_info_ioctl();

	if_getaddrs();

#if defined(HAVE_PROC_NET_IF_INET6)
	/* Linux provides interface's IPv6 address via
	   /proc/net/if_inet6. */
	ifaddr_proc_ipv6();
#endif /* HAVE_PROC_NET_IF_INET6 */
}
Commit	Line	Data
718e3744	1	/*
	2	* Interface looking up by ioctl ().
	3	* Copyright (C) 1997, 98 Kunihiro Ishiguro
	4	*
	5	* This file is part of GNU Zebra.
	6	*
	7	* GNU Zebra is free software; you can redistribute it and/or modify it
	8	* under the terms of the GNU General Public License as published by the
	9	* Free Software Foundation; either version 2, or (at your option) any
	10	* later version.
	11	*
	12	* GNU Zebra is distributed in the hope that it will be useful, but
	13	* WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* General Public License for more details.
	16	*
896014f4 DL	17	* You should have received a copy of the GNU General Public License along
	18	* with this program; see the file COPYING; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
718e3744	20	*/
	21
	22	#include <zebra.h>
	23
	24	#include "if.h"
	25	#include "sockunion.h"
	26	#include "prefix.h"
	27	#include "ioctl.h"
	28	#include "connected.h"
	29	#include "memory.h"
4a1ab8e4	30	#include "zebra_memory.h"
718e3744	31	#include "log.h"
8f7d9fc0	32	#include "vrf.h"
82283592	33	#include "vty.h"
718e3744	34
718e3744	35	#include "zebra/interface.h"
8f7d9fc0	36	#include "zebra/rib.h"
718e3744	37
24f5e2fc DL	38	#include <ifaddrs.h>
24f5e2fc DL	39
718e3744	40	/* Interface looking up using infamous SIOCGIFCONF. */
d62a17ae	41	static int interface_list_ioctl(void)
718e3744	42	{
d62a17ae	43	int ret;
d62a17ae	44	int sock;
718e3744	45	#define IFNUM_BASE 32
d62a17ae	46	int ifnum;
	47	struct ifreq *ifreq;
	48	struct ifconf ifconf;
	49	struct interface *ifp;
	50	int n;
	51	int lastlen;
	52
	53	/* Normally SIOCGIFCONF works with AF_INET socket. */
	54	sock = socket(AF_INET, SOCK_DGRAM, 0);
	55	if (sock < 0) {
	56	zlog_warn("Can't make AF_INET socket stream: %s",
	57	safe_strerror(errno));
	58	return -1;
	59	}
	60
	61	/* Set initial ifreq count. This will be double when SIOCGIFCONF
	62	fail. Solaris has SIOCGIFNUM. */
718e3744	63	#ifdef SIOCGIFNUM
d62a17ae	64	ret = ioctl(sock, SIOCGIFNUM, &ifnum);
	65	if (ret < 0)
	66	ifnum = IFNUM_BASE;
	67	else
	68	ifnum++;
718e3744	69	#else
d62a17ae	70	ifnum = IFNUM_BASE;
718e3744	71	#endif /* SIOCGIFNUM */
718e3744	72
d62a17ae	73	ifconf.ifc_buf = NULL;
	74
	75	lastlen = 0;
	76	/* Loop until SIOCGIFCONF success. */
	77	for (;;) {
	78	ifconf.ifc_len = sizeof(struct ifreq) * ifnum;
	79	ifconf.ifc_buf =
	80	XREALLOC(MTYPE_TMP, ifconf.ifc_buf, ifconf.ifc_len);
	81
	82	ret = ioctl(sock, SIOCGIFCONF, &ifconf);
	83
	84	if (ret < 0) {
	85	zlog_warn("SIOCGIFCONF: %s", safe_strerror(errno));
	86	goto end;
	87	}
	88	/* Repeatedly get info til buffer fails to grow. */
	89	if (ifconf.ifc_len > lastlen) {
	90	lastlen = ifconf.ifc_len;
	91	ifnum += 10;
	92	continue;
	93	}
	94	/* Success. */
	95	break;
718e3744	96	}
718e3744	97
d62a17ae	98	/* Allocate interface. */
d62a17ae	99	ifreq = ifconf.ifc_req;
718e3744	100
718e3744	101	#ifdef OPEN_BSD
d62a17ae	102	for (n = 0; n < ifconf.ifc_len;) {
	103	unsigned int size;
	104
	105	ifreq = (struct ifreq *)((caddr_t)ifconf.ifc_req + n);
	106	ifp = if_get_by_name_len(
	107	ifreq->ifr_name,
	108	strnlen(ifreq->ifr_name, sizeof(ifreq->ifr_name)),
	109	VRF_DEFAULT, 0);
	110	if_add_update(ifp);
	111	size = ifreq->ifr_addr.sa_len;
	112	if (size < sizeof(ifreq->ifr_addr))
	113	size = sizeof(ifreq->ifr_addr);
	114	size += sizeof(ifreq->ifr_name);
	115	n += size;
	116	}
718e3744	117	#else
d62a17ae	118	for (n = 0; n < ifconf.ifc_len; n += sizeof(struct ifreq)) {
	119	ifp = if_get_by_name_len(
	120	ifreq->ifr_name,
	121	strnlen(ifreq->ifr_name, sizeof(ifreq->ifr_name)),
	122	VRF_DEFAULT, 0);
	123	if_add_update(ifp);
	124	ifreq++;
	125	}
718e3744	126	#endif /* OPEN_BSD */
718e3744	127
d62a17ae	128	end:
	129	close(sock);
	130	XFREE(MTYPE_TMP, ifconf.ifc_buf);
718e3744	131
d62a17ae	132	return ret;
718e3744	133	}
	134
	135	/* Get interface's index by ioctl. */
d62a17ae	136	static int if_get_index(struct interface *ifp)
718e3744	137	{
d62a17ae	138	ifp->ifindex = if_nametoindex(ifp->name);
d62a17ae	139	return ifp->ifindex;
718e3744	140	}
	141
	142	#ifdef SIOCGIFHWADDR
d62a17ae	143	static int if_get_hwaddr(struct interface *ifp)
718e3744	144	{
d62a17ae	145	int ret;
	146	struct ifreq ifreq;
	147	int i;
	148
	149	strncpy(ifreq.ifr_name, ifp->name, IFNAMSIZ);
	150	ifreq.ifr_addr.sa_family = AF_INET;
	151
	152	/* Fetch Hardware address if available. */
	153	ret = if_ioctl(SIOCGIFHWADDR, (caddr_t)&ifreq);
	154	if (ret < 0)
	155	ifp->hw_addr_len = 0;
	156	else {
	157	memcpy(ifp->hw_addr, ifreq.ifr_hwaddr.sa_data, 6);
	158
	159	for (i = 0; i < 6; i++)
	160	if (ifp->hw_addr[i] != 0)
	161	break;
	162
	163	if (i == 6)
	164	ifp->hw_addr_len = 0;
	165	else
	166	ifp->hw_addr_len = 6;
	167	}
	168	return 0;
718e3744	169	}
	170	#endif /* SIOCGIFHWADDR */
	171
d62a17ae	172	static int if_getaddrs(void)
718e3744	173	{
d62a17ae	174	int ret;
	175	struct ifaddrs *ifap;
	176	struct ifaddrs *ifapfree;
	177	struct interface *ifp;
	178	int prefixlen;
	179
	180	ret = getifaddrs(&ifap);
	181	if (ret != 0) {
	182	zlog_err("getifaddrs(): %s", safe_strerror(errno));
	183	return -1;
718e3744	184	}
718e3744	185
d62a17ae	186	for (ifapfree = ifap; ifap; ifap = ifap->ifa_next) {
	187	if (ifap->ifa_addr == NULL) {
	188	zlog_err(
	189	"%s: nonsensical ifaddr with NULL ifa_addr, ifname %s",
	190	__func__,
	191	(ifap->ifa_name ? ifap->ifa_name : "(null)"));
	192	continue;
	193	}
	194
	195	ifp = if_lookup_by_name(ifap->ifa_name, VRF_DEFAULT);
	196	if (ifp == NULL) {
	197	zlog_err("if_getaddrs(): Can't lookup interface %s\n",
	198	ifap->ifa_name);
	199	continue;
	200	}
	201
	202	if (ifap->ifa_addr->sa_family == AF_INET) {
	203	struct sockaddr_in *addr;
	204	struct sockaddr_in *mask;
	205	struct sockaddr_in *dest;
	206	struct in_addr *dest_pnt;
	207	int flags = 0;
	208
	209	addr = (struct sockaddr_in *)ifap->ifa_addr;
	210	mask = (struct sockaddr_in *)ifap->ifa_netmask;
	211	prefixlen = ip_masklen(mask->sin_addr);
	212
	213	dest_pnt = NULL;
	214
	215	if (ifap->ifa_dstaddr
	216	&& !IPV4_ADDR_SAME(&addr->sin_addr,
	217	&((struct sockaddr_in *)
	218	ifap->ifa_dstaddr)
	219	->sin_addr)) {
	220	dest = (struct sockaddr_in *)ifap->ifa_dstaddr;
	221	dest_pnt = &dest->sin_addr;
	222	flags = ZEBRA_IFA_PEER;
	223	} else if (ifap->ifa_broadaddr
	224	&& !IPV4_ADDR_SAME(
	225	&addr->sin_addr,
	226	&((struct sockaddr_in *)
	227	ifap->ifa_broadaddr)
	228	->sin_addr)) {
	229	dest = (struct sockaddr_in *)
	230	ifap->ifa_broadaddr;
	231	dest_pnt = &dest->sin_addr;
	232	}
	233
	234	connected_add_ipv4(ifp, flags, &addr->sin_addr,
	235	prefixlen, dest_pnt, NULL);
	236	}
	237	if (ifap->ifa_addr->sa_family == AF_INET6) {
	238	struct sockaddr_in6 *addr;
	239	struct sockaddr_in6 *mask;
	240	struct sockaddr_in6 *dest;
	241	struct in6_addr *dest_pnt;
	242	int flags = 0;
	243
	244	addr = (struct sockaddr_in6 *)ifap->ifa_addr;
	245	mask = (struct sockaddr_in6 *)ifap->ifa_netmask;
	246	prefixlen = ip6_masklen(mask->sin6_addr);
	247
	248	dest_pnt = NULL;
	249
250	if (ifap->ifa_dstaddr
251	&& !IPV6_ADDR_SAME(&addr->sin6_addr,
252	&((struct sockaddr_in6 *)
253	ifap->ifa_dstaddr)
254	->sin6_addr)) {
255	dest = (struct sockaddr_in6 *)ifap->ifa_dstaddr;
256	dest_pnt = &dest->sin6_addr;
257	flags = ZEBRA_IFA_PEER;
258	} else if (ifap->ifa_broadaddr
259	&& !IPV6_ADDR_SAME(
260	&addr->sin6_addr,
261	&((struct sockaddr_in6 *)
262	ifap->ifa_broadaddr)
263	->sin6_addr)) {
264	dest = (struct sockaddr_in6 *)
265	ifap->ifa_broadaddr;
266	dest_pnt = &dest->sin6_addr;
267	}
718e3744	268
ab836aab	269	#if defined(KAME)
d62a17ae	270	if (IN6_IS_ADDR_LINKLOCAL(&addr->sin6_addr)) {
	271	addr->sin6_scope_id =
	272	ntohs((u_int16_t )&addr->sin6_addr
	273	.s6_addr[2]);
	274	addr->sin6_addr.s6_addr[2] =
	275	addr->sin6_addr.s6_addr[3] = 0;
	276	}
	277	#endif
	278
	279	connected_add_ipv6(ifp, flags, &addr->sin6_addr,
	280	prefixlen, dest_pnt, NULL);
	281	}
718e3744	282	}
718e3744	283
d62a17ae	284	freeifaddrs(ifapfree);
718e3744	285
d62a17ae	286	return 0;
718e3744	287	}
718e3744	288
718e3744	289	/* Fetch interface information via ioctl(). */
d62a17ae	290	static void interface_info_ioctl()
718e3744	291	{
d62a17ae	292	struct listnode node, nnode;
	293	struct interface *ifp;
	294
	295	for (ALL_LIST_ELEMENTS(vrf_iflist(VRF_DEFAULT), node, nnode, ifp)) {
	296	if_get_index(ifp);
718e3744	297	#ifdef SIOCGIFHWADDR
d62a17ae	298	if_get_hwaddr(ifp);
718e3744	299	#endif /* SIOCGIFHWADDR */
d62a17ae	300	if_get_flags(ifp);
	301	if_get_mtu(ifp);
	302	if_get_metric(ifp);
	303	}
718e3744	304	}
	305
	306	/* Lookup all interface information. */
d62a17ae	307	void interface_list(struct zebra_ns *zns)
718e3744	308	{
12f6fb97	309
d62a17ae	310	zlog_info("interface_list: NS %u", zns->ns_id);
12f6fb97	311
d62a17ae	312	/* Linux can do both proc & ioctl, ioctl is the only way to get
d62a17ae	313	interface aliases in 2.2 series kernels. */
718e3744	314	#ifdef HAVE_PROC_NET_DEV
d62a17ae	315	interface_list_proc();
718e3744	316	#endif /* HAVE_PROC_NET_DEV */
d62a17ae	317	interface_list_ioctl();
718e3744	318
d62a17ae	319	/* After listing is done, get index, address, flags and other
	320	interface's information. */
	321	interface_info_ioctl();
718e3744	322
d62a17ae	323	if_getaddrs();
718e3744	324
56c1f7d8	325	#if defined(HAVE_PROC_NET_IF_INET6)
d62a17ae	326	/* Linux provides interface's IPv6 address via
	327	/proc/net/if_inet6. */
	328	ifaddr_proc_ipv6();
56c1f7d8	329	#endif /* HAVE_PROC_NET_IF_INET6 */
718e3744	330	}