[mirror_iproute2.git] / bridge / link.c


#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <time.h>
#include <sys/socket.h>
#include <sys/time.h>
#include <netinet/in.h>
#include <linux/if.h>
#include <linux/if_bridge.h>
#include <string.h>
#include <stdbool.h>

#include "libnetlink.h"
#include "utils.h"
#include "br_common.h"

unsigned int filter_index;

static const char *port_states[] = {
	[BR_STATE_DISABLED] = "disabled",
	[BR_STATE_LISTENING] = "listening",
	[BR_STATE_LEARNING] = "learning",
	[BR_STATE_FORWARDING] = "forwarding",
	[BR_STATE_BLOCKING] = "blocking",
};

extern char *if_indextoname (unsigned int __ifindex, char *__ifname);

static void print_link_flags(FILE *fp, unsigned flags)
{
	fprintf(fp, "<");
	if (flags & IFF_UP && !(flags & IFF_RUNNING))
		fprintf(fp, "NO-CARRIER%s", flags ? "," : "");
	flags &= ~IFF_RUNNING;
#define _PF(f) if (flags&IFF_##f) { \
                  flags &= ~IFF_##f ; \
                  fprintf(fp, #f "%s", flags ? "," : ""); }
	_PF(LOOPBACK);
	_PF(BROADCAST);
	_PF(POINTOPOINT);
	_PF(MULTICAST);
	_PF(NOARP);
	_PF(ALLMULTI);
	_PF(PROMISC);
	_PF(MASTER);
	_PF(SLAVE);
	_PF(DEBUG);
	_PF(DYNAMIC);
	_PF(AUTOMEDIA);
	_PF(PORTSEL);
	_PF(NOTRAILERS);
	_PF(UP);
	_PF(LOWER_UP);
	_PF(DORMANT);
	_PF(ECHO);
#undef _PF
        if (flags)
		fprintf(fp, "%x", flags);
	fprintf(fp, "> ");
}

static const char *oper_states[] = {
	"UNKNOWN", "NOTPRESENT", "DOWN", "LOWERLAYERDOWN",
	"TESTING", "DORMANT",	 "UP"
};

static void print_operstate(FILE *f, __u8 state)
{
	if (state >= sizeof(oper_states)/sizeof(oper_states[0]))
		fprintf(f, "state %#x ", state);
	else
		fprintf(f, "state %s ", oper_states[state]);
}

int print_linkinfo(const struct sockaddr_nl *who,
		   struct nlmsghdr *n, void *arg)
{
	FILE *fp = arg;
	int len = n->nlmsg_len;
	struct ifinfomsg *ifi = NLMSG_DATA(n);
	struct rtattr * tb[IFLA_MAX+1];
	char b1[IFNAMSIZ];

	len -= NLMSG_LENGTH(sizeof(*ifi));
	if (len < 0) {
		fprintf(stderr, "Message too short!\n");
		return -1;
        }

	if (!(ifi->ifi_family == AF_BRIDGE || ifi->ifi_family == AF_UNSPEC))
		return 0;

	if (filter_index && filter_index != ifi->ifi_index)
		return 0;

	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);

	if (tb[IFLA_IFNAME] == NULL) {
		fprintf(stderr, "BUG: nil ifname\n");
		return -1;
	}

	if (n->nlmsg_type == RTM_DELLINK)
		fprintf(fp, "Deleted ");

	fprintf(fp, "%d: %s ", ifi->ifi_index,
		tb[IFLA_IFNAME] ? rta_getattr_str(tb[IFLA_IFNAME]) : "<nil>");

	if (tb[IFLA_OPERSTATE])
		print_operstate(fp, rta_getattr_u8(tb[IFLA_OPERSTATE]));

	if (tb[IFLA_LINK]) {
		SPRINT_BUF(b1);
		int iflink = rta_getattr_u32(tb[IFLA_LINK]);
		if (iflink == 0)
			fprintf(fp, "@NONE: ");
		else
			fprintf(fp, "@%s: ",
				if_indextoname(iflink, b1));
	} else
		fprintf(fp, ": ");

	print_link_flags(fp, ifi->ifi_flags);

	if (tb[IFLA_MTU])
		fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));

	if (tb[IFLA_MASTER])
		fprintf(fp, "master %s ",
			if_indextoname(rta_getattr_u32(tb[IFLA_MASTER]), b1));

	if (tb[IFLA_PROTINFO]) {
		__u8 state = rta_getattr_u8(tb[IFLA_PROTINFO]);
		if (state <= BR_STATE_BLOCKING)
			fprintf(fp, "state %s", port_states[state]);
		else
			fprintf(fp, "state (%d)", state);
	}


	fprintf(fp, "\n");
	fflush(fp);
	return 0;
}

static void usage(void)
{
	fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
	fprintf(stderr, "                               [ guard {on | off} ]\n");
	fprintf(stderr, "                               [ hairpin {on | off} ] \n");
	fprintf(stderr, "                               [ fastleave {on | off} ]\n");
	fprintf(stderr,	"                               [ root_block {on | off} ]\n");
	fprintf(stderr, "                               [ hwmode {vepa | veb} ]\n");
	fprintf(stderr, "       bridge link show [dev DEV]\n");
	exit(-1);
}

static bool on_off(char *arg, __s8 *attr, char *val)
{
	if (strcmp(val, "on") == 0)
		*attr = 1;
	else if (strcmp(val, "off") == 0)
		*attr = 0;
	else {
		fprintf(stderr,
			"Error: argument of \"%s\" must be \"on\" or \"off\"\n",
			arg);
		return false;
	}

	return true;
}

static int brlink_modify(int argc, char **argv)
{
	struct {
		struct nlmsghdr  n;
		struct ifinfomsg ifm;
		char             buf[512];
	} req;
	char *d = NULL;
	__s8 hairpin = -1;
	__s8 bpdu_guard = -1;
	__s8 fast_leave = -1;
	__u32 cost = 0;
	__s16 priority = -1;
	__s8 state = -1;
	__s16 mode = -1;
	__u16 flags = BRIDGE_FLAGS_MASTER;
	struct rtattr *nest;

	memset(&req, 0, sizeof(req));

	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	req.n.nlmsg_flags = NLM_F_REQUEST;
	req.n.nlmsg_type = RTM_SETLINK;
	req.ifm.ifi_family = PF_BRIDGE;

	while (argc > 0) {
		if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			d = *argv;
		} else if (strcmp(*argv, "guard") == 0) {
			NEXT_ARG();
			if (!on_off("guard", &bpdu_guard, *argv))
				exit(-1);
		} else if (strcmp(*argv, "hairpin") == 0) {
			NEXT_ARG();
			if (!on_off("hairping", &hairpin, *argv))
				exit(-1);
		} else if (strcmp(*argv, "fastleave") == 0) {
			NEXT_ARG();
			if (!on_off("fastleave", &fast_leave, *argv))
				exit(-1);
		} else if (strcmp(*argv, "cost")) {
			NEXT_ARG();
			cost = atoi(*argv);
		} else if (strcmp(*argv, "priority")) {
			NEXT_ARG();
			priority = atoi(*argv);
		} else if (strcmp(*argv, "state")) {
			NEXT_ARG();
			state = atoi(*argv);
		} else if (strcmp(*argv, "mode")) {
			NEXT_ARG();
			flags |= BRIDGE_FLAGS_SELF;
			if (strcmp(*argv, "vepa") == 0)
				mode = BRIDGE_MODE_VEPA;
			else if (strcmp(*argv, "veb") == 0)
				mode = BRIDGE_MODE_VEB;
			else {
				fprintf(stderr,
					"Mode argument must be \"vepa\" or "
					"\"veb\".\n");
				exit(-1);
			}
		} else {
			usage();
		}
		argc--; argv++;
	}
	if (d == NULL) {
		fprintf(stderr, "Device is a required argument.\n");
		exit(-1);
	}


	req.ifm.ifi_index = ll_name_to_index(d);
	if (req.ifm.ifi_index == 0) {
		fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
		exit(-1);
	}

	/* Nested PROTINFO attribute.  Contains: port flags, cost, priority and
	 * state.
	 */
	nest = addattr_nest(&req.n, sizeof(req),
			    IFLA_PROTINFO | NLA_F_NESTED);
	/* Flags first */
	if (bpdu_guard >= 0)
		addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
	if (hairpin >= 0)
		addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
	if (fast_leave >= 0)
		addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
			 fast_leave);

	if (cost > 0)
		addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);

	if (priority >= 0)
		addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);

	if (state >= 0)
		addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);

	addattr_nest_end(&req.n, nest);

	/* IFLA_AF_SPEC nested attribute.  Contains IFLA_BRIDGE_FLAGS that
	 * designates master or self operation as well as 'vepa' or 'veb'
	 * operation modes.  These are only valid in 'self' mode on some
	 * devices so far.  Thus we only need to include the flags attribute
	 * if we are setting the hw mode.
	 */
	if (mode >= 0) {
		nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);

		addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);

		if (mode >= 0)
			addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);

		addattr_nest_end(&req.n, nest);
	}

	if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
		exit(2);

	return 0;
}

static int brlink_show(int argc, char **argv)
{
	char *filter_dev = NULL;

	while (argc > 0) {
		if (strcmp(*argv, "dev") == 0) {
			NEXT_ARG();
			if (filter_dev)
				duparg("dev", *argv);
			filter_dev = *argv;
		}
		argc--; argv++;
	}

	if (filter_dev) {
		if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
			fprintf(stderr, "Cannot find device \"%s\"\n",
				filter_dev);
			return -1;
		}
	}

	if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
		perror("Cannon send dump request");
		exit(1);
	}

	if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
		fprintf(stderr, "Dump terminated\n");
		exit(1);
	}
	return 0;
}

int do_link(int argc, char **argv)
{
	ll_init_map(&rth);
	if (argc > 0) {
		if (matches(*argv, "set") == 0 ||
		    matches(*argv, "change") == 0)
			return brlink_modify(argc-1, argv+1);
		if (matches(*argv, "show") == 0 ||
		    matches(*argv, "lst") == 0 ||
		    matches(*argv, "list") == 0)
			return brlink_show(argc-1, argv+1);
		if (matches(*argv, "help") == 0)
			usage();
	} else
		return brlink_show(0, NULL);

	fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
	exit(-1);
}
Commit	Line	Data
d04bc300 SH	1
	2	#include <stdio.h>
	3	#include <stdlib.h>
	4	#include <unistd.h>
	5	#include <time.h>
	6	#include <sys/socket.h>
	7	#include <sys/time.h>
	8	#include <netinet/in.h>
	9	#include <linux/if.h>
	10	#include <linux/if_bridge.h>
	11	#include <string.h>
64108901	12	#include <stdbool.h>
d04bc300	13
64108901	14	#include "libnetlink.h"
d04bc300 SH	15	#include "utils.h"
	16	#include "br_common.h"
	17
64108901 VY	18	unsigned int filter_index;
64108901 VY	19
d04bc300 SH	20	static const char *port_states[] = {
	21	[BR_STATE_DISABLED] = "disabled",
	22	[BR_STATE_LISTENING] = "listening",
	23	[BR_STATE_LEARNING] = "learning",
	24	[BR_STATE_FORWARDING] = "forwarding",
	25	[BR_STATE_BLOCKING] = "blocking",
	26	};
	27
	28	extern char if_indextoname (unsigned int __ifindex, char __ifname);
	29
	30	static void print_link_flags(FILE *fp, unsigned flags)
	31	{
	32	fprintf(fp, "<");
	33	if (flags & IFF_UP && !(flags & IFF_RUNNING))
	34	fprintf(fp, "NO-CARRIER%s", flags ? "," : "");
	35	flags &= ~IFF_RUNNING;
	36	#define _PF(f) if (flags&IFF_##f) { \
	37	flags &= ~IFF_##f ; \
	38	fprintf(fp, #f "%s", flags ? "," : ""); }
	39	_PF(LOOPBACK);
	40	_PF(BROADCAST);
	41	_PF(POINTOPOINT);
	42	_PF(MULTICAST);
	43	_PF(NOARP);
	44	_PF(ALLMULTI);
	45	_PF(PROMISC);
	46	_PF(MASTER);
	47	_PF(SLAVE);
	48	_PF(DEBUG);
	49	_PF(DYNAMIC);
	50	_PF(AUTOMEDIA);
	51	_PF(PORTSEL);
	52	_PF(NOTRAILERS);
	53	_PF(UP);
	54	_PF(LOWER_UP);
	55	_PF(DORMANT);
	56	_PF(ECHO);
	57	#undef _PF
	58	if (flags)
	59	fprintf(fp, "%x", flags);
	60	fprintf(fp, "> ");
	61	}
	62
	63	static const char *oper_states[] = {
38df7ac9	64	"UNKNOWN", "NOTPRESENT", "DOWN", "LOWERLAYERDOWN",
d04bc300 SH	65	"TESTING", "DORMANT", "UP"
	66	};
	67
	68	static void print_operstate(FILE *f, __u8 state)
	69	{
	70	if (state >= sizeof(oper_states)/sizeof(oper_states[0]))
	71	fprintf(f, "state %#x ", state);
	72	else
	73	fprintf(f, "state %s ", oper_states[state]);
	74	}
	75
	76	int print_linkinfo(const struct sockaddr_nl *who,
	77	struct nlmsghdr n, void arg)
	78	{
	79	FILE *fp = arg;
	80	int len = n->nlmsg_len;
	81	struct ifinfomsg *ifi = NLMSG_DATA(n);
	82	struct rtattr * tb[IFLA_MAX+1];
	83	char b1[IFNAMSIZ];
	84
	85	len -= NLMSG_LENGTH(sizeof(*ifi));
	86	if (len < 0) {
	87	fprintf(stderr, "Message too short!\n");
	88	return -1;
	89	}
	90
	91	if (!(ifi->ifi_family == AF_BRIDGE \|\| ifi->ifi_family == AF_UNSPEC))
	92	return 0;
	93
64108901 VY	94	if (filter_index && filter_index != ifi->ifi_index)
	95	return 0;
	96
d04bc300 SH	97	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
	98
	99	if (tb[IFLA_IFNAME] == NULL) {
	100	fprintf(stderr, "BUG: nil ifname\n");
	101	return -1;
	102	}
	103
	104	if (n->nlmsg_type == RTM_DELLINK)
	105	fprintf(fp, "Deleted ");
	106
	107	fprintf(fp, "%d: %s ", ifi->ifi_index,
1465db1a	108	tb[IFLA_IFNAME] ? rta_getattr_str(tb[IFLA_IFNAME]) : "<nil>");
d04bc300	109
38df7ac9	110	if (tb[IFLA_OPERSTATE])
1465db1a	111	print_operstate(fp, rta_getattr_u8(tb[IFLA_OPERSTATE]));
38df7ac9	112
d04bc300 SH	113	if (tb[IFLA_LINK]) {
d04bc300 SH	114	SPRINT_BUF(b1);
1465db1a	115	int iflink = rta_getattr_u32(tb[IFLA_LINK]);
d04bc300 SH	116	if (iflink == 0)
d04bc300 SH	117	fprintf(fp, "@NONE: ");
1465db1a	118	else
38df7ac9	119	fprintf(fp, "@%s: ",
d04bc300	120	if_indextoname(iflink, b1));
1465db1a	121	} else
d04bc300	122	fprintf(fp, ": ");
d04bc300 SH	123
	124	print_link_flags(fp, ifi->ifi_flags);
	125
	126	if (tb[IFLA_MTU])
1465db1a	127	fprintf(fp, "mtu %u ", rta_getattr_u32(tb[IFLA_MTU]));
d04bc300	128
1465db1a	129	if (tb[IFLA_MASTER])
38df7ac9	130	fprintf(fp, "master %s ",
1465db1a	131	if_indextoname(rta_getattr_u32(tb[IFLA_MASTER]), b1));
d04bc300 SH	132
d04bc300 SH	133	if (tb[IFLA_PROTINFO]) {
1465db1a	134	__u8 state = rta_getattr_u8(tb[IFLA_PROTINFO]);
d04bc300 SH	135	if (state <= BR_STATE_BLOCKING)
	136	fprintf(fp, "state %s", port_states[state]);
	137	else
	138	fprintf(fp, "state (%d)", state);
	139	}
	140
	141
	142	fprintf(fp, "\n");
	143	fflush(fp);
	144	return 0;
	145	}
64108901 VY	146
	147	static void usage(void)
	148	{
	149	fprintf(stderr, "Usage: bridge link set dev DEV [ cost COST ] [ priority PRIO ] [ state STATE ]\n");
	150	fprintf(stderr, " [ guard {on \| off} ]\n");
	151	fprintf(stderr, " [ hairpin {on \| off} ] \n");
	152	fprintf(stderr, " [ fastleave {on \| off} ]\n");
	153	fprintf(stderr, " [ root_block {on \| off} ]\n");
	154	fprintf(stderr, " [ hwmode {vepa \| veb} ]\n");
	155	fprintf(stderr, " bridge link show [dev DEV]\n");
	156	exit(-1);
	157	}
	158
	159	static bool on_off(char arg, __s8 attr, char *val)
	160	{
	161	if (strcmp(val, "on") == 0)
	162	*attr = 1;
	163	else if (strcmp(val, "off") == 0)
	164	*attr = 0;
	165	else {
	166	fprintf(stderr,
	167	"Error: argument of \"%s\" must be \"on\" or \"off\"\n",
	168	arg);
	169	return false;
	170	}
	171
	172	return true;
	173	}
	174
	175	static int brlink_modify(int argc, char **argv)
	176	{
	177	struct {
	178	struct nlmsghdr n;
	179	struct ifinfomsg ifm;
	180	char buf[512];
	181	} req;
	182	char *d = NULL;
	183	__s8 hairpin = -1;
	184	__s8 bpdu_guard = -1;
	185	__s8 fast_leave = -1;
	186	__u32 cost = 0;
	187	__s16 priority = -1;
	188	__s8 state = -1;
	189	__s16 mode = -1;
	190	__u16 flags = BRIDGE_FLAGS_MASTER;
	191	struct rtattr *nest;
	192
	193	memset(&req, 0, sizeof(req));
	194
	195	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
	196	req.n.nlmsg_flags = NLM_F_REQUEST;
	197	req.n.nlmsg_type = RTM_SETLINK;
	198	req.ifm.ifi_family = PF_BRIDGE;
	199
	200	while (argc > 0) {
	201	if (strcmp(*argv, "dev") == 0) {
	202	NEXT_ARG();
	203	d = *argv;
	204	} else if (strcmp(*argv, "guard") == 0) {
	205	NEXT_ARG();
	206	if (!on_off("guard", &bpdu_guard, *argv))
	207	exit(-1);
	208	} else if (strcmp(*argv, "hairpin") == 0) {
	209	NEXT_ARG();
210	if (!on_off("hairping", &hairpin, *argv))
211	exit(-1);
212	} else if (strcmp(*argv, "fastleave") == 0) {
213	NEXT_ARG();
214	if (!on_off("fastleave", &fast_leave, *argv))
215	exit(-1);
216	} else if (strcmp(*argv, "cost")) {
217	NEXT_ARG();
218	cost = atoi(*argv);
219	} else if (strcmp(*argv, "priority")) {
220	NEXT_ARG();
221	priority = atoi(*argv);
222	} else if (strcmp(*argv, "state")) {
223	NEXT_ARG();
224	state = atoi(*argv);
225	} else if (strcmp(*argv, "mode")) {
226	NEXT_ARG();
227	flags \|= BRIDGE_FLAGS_SELF;
228	if (strcmp(*argv, "vepa") == 0)
229	mode = BRIDGE_MODE_VEPA;
230	else if (strcmp(*argv, "veb") == 0)
231	mode = BRIDGE_MODE_VEB;
232	else {
233	fprintf(stderr,
234	"Mode argument must be \"vepa\" or "
235	"\"veb\".\n");
236	exit(-1);
237	}
238	} else {
239	usage();
240	}
241	argc--; argv++;
242	}
243	if (d == NULL) {
244	fprintf(stderr, "Device is a required argument.\n");
245	exit(-1);
246	}
247
248
249	req.ifm.ifi_index = ll_name_to_index(d);
250	if (req.ifm.ifi_index == 0) {
251	fprintf(stderr, "Cannot find bridge device \"%s\"\n", d);
252	exit(-1);
253	}
254
255	/* Nested PROTINFO attribute. Contains: port flags, cost, priority and
256	* state.
257	*/
258	nest = addattr_nest(&req.n, sizeof(req),
259	IFLA_PROTINFO \| NLA_F_NESTED);
260	/* Flags first */
261	if (bpdu_guard >= 0)
262	addattr8(&req.n, sizeof(req), IFLA_BRPORT_GUARD, bpdu_guard);
263	if (hairpin >= 0)
264	addattr8(&req.n, sizeof(req), IFLA_BRPORT_MODE, hairpin);
265	if (fast_leave >= 0)
266	addattr8(&req.n, sizeof(req), IFLA_BRPORT_FAST_LEAVE,
267	fast_leave);
268
269	if (cost > 0)
270	addattr32(&req.n, sizeof(req), IFLA_BRPORT_COST, cost);
271
272	if (priority >= 0)
273	addattr16(&req.n, sizeof(req), IFLA_BRPORT_PRIORITY, priority);
274
275	if (state >= 0)
276	addattr8(&req.n, sizeof(req), IFLA_BRPORT_STATE, state);
277
278	addattr_nest_end(&req.n, nest);
279
280	/* IFLA_AF_SPEC nested attribute. Contains IFLA_BRIDGE_FLAGS that
281	* designates master or self operation as well as 'vepa' or 'veb'
282	* operation modes. These are only valid in 'self' mode on some
283	* devices so far. Thus we only need to include the flags attribute
284	* if we are setting the hw mode.
285	*/
286	if (mode >= 0) {
287	nest = addattr_nest(&req.n, sizeof(req), IFLA_AF_SPEC);
288
289	addattr16(&req.n, sizeof(req), IFLA_BRIDGE_FLAGS, flags);
290
291	if (mode >= 0)
292	addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MODE, mode);
293
294	addattr_nest_end(&req.n, nest);
295	}
296
297	if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
298	exit(2);
299
300	return 0;
301	}
302
303	static int brlink_show(int argc, char **argv)
304	{
305	char *filter_dev = NULL;
306
307	while (argc > 0) {
308	if (strcmp(*argv, "dev") == 0) {
309	NEXT_ARG();
310	if (filter_dev)
311	duparg("dev", *argv);
312	filter_dev = *argv;
313	}
314	argc--; argv++;
315	}
316
317	if (filter_dev) {
318	if ((filter_index = ll_name_to_index(filter_dev)) == 0) {
319	fprintf(stderr, "Cannot find device \"%s\"\n",
320	filter_dev);
321	return -1;
322	}
323	}
324
325	if (rtnl_wilddump_request(&rth, PF_BRIDGE, RTM_GETLINK) < 0) {
326	perror("Cannon send dump request");
327	exit(1);
328	}
329
330	if (rtnl_dump_filter(&rth, print_linkinfo, stdout) < 0) {
331	fprintf(stderr, "Dump terminated\n");
332	exit(1);
333	}
334	return 0;
335	}
336
337	int do_link(int argc, char **argv)
338	{
339	ll_init_map(&rth);
340	if (argc > 0) {
341	if (matches(*argv, "set") == 0 \|\|
342	matches(*argv, "change") == 0)
343	return brlink_modify(argc-1, argv+1);
344	if (matches(*argv, "show") == 0 \|\|
345	matches(*argv, "lst") == 0 \|\|
346	matches(*argv, "list") == 0)
347	return brlink_show(argc-1, argv+1);
348	if (matches(*argv, "help") == 0)
349	usage();
350	} else
351	return brlink_show(0, NULL);
352
353	fprintf(stderr, "Command \"%s\" is unknown, try \"bridge link help\".\n", *argv);
354	exit(-1);
355	}