iplink.c revision 6c55c8c4617c5853b00cee3eefe94654d9a25c41 
1/*
2 * iplink.c		"ip link".
3 *
4 *		This program is free software; you can redistribute it and/or
5 *		modify it under the terms of the GNU General Public License
6 *		as published by the Free Software Foundation; either version
7 *		2 of the License, or (at your option) any later version.
8 *
9 * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 *
11 */
12
13#include <stdio.h>
14#include <stdlib.h>
15#include <unistd.h>
16#include <syslog.h>
17#include <fcntl.h>
18#include <dlfcn.h>
19#include <errno.h>
20#include <sys/socket.h>
21#include <linux/if.h>
22#include <linux/if_packet.h>
23#include <linux/if_ether.h>
24#include <linux/sockios.h>
25#include <netinet/in.h>
26#include <arpa/inet.h>
27#include <string.h>
28#include <sys/ioctl.h>
29#include <linux/sockios.h>
30#include <stdbool.h>
31
32#include "rt_names.h"
33#include "utils.h"
34#include "ip_common.h"
35#include "namespace.h"
36
37#define IPLINK_IOCTL_COMPAT	1
38#ifndef LIBDIR
39#define LIBDIR "/usr/lib"
40#endif
41
42static void usage(void) __attribute__((noreturn));
43static int iplink_have_newlink(void);
44
45void iplink_usage(void)
46{
47	if (iplink_have_newlink()) {
48		fprintf(stderr, "Usage: ip link add [link DEV] [ name ] NAME\n");
49		fprintf(stderr, "                   [ txqueuelen PACKETS ]\n");
50		fprintf(stderr, "                   [ address LLADDR ]\n");
51		fprintf(stderr, "                   [ broadcast LLADDR ]\n");
52		fprintf(stderr, "                   [ mtu MTU ] [index IDX ]\n");
53		fprintf(stderr, "                   [ numtxqueues QUEUE_COUNT ]\n");
54		fprintf(stderr, "                   [ numrxqueues QUEUE_COUNT ]\n");
55		fprintf(stderr, "                   type TYPE [ ARGS ]\n");
56		fprintf(stderr, "       ip link delete { DEVICE | dev DEVICE | group DEVGROUP } type TYPE [ ARGS ]\n");
57		fprintf(stderr, "\n");
58		fprintf(stderr, "       ip link set { DEVICE | dev DEVICE | group DEVGROUP } [ { up | down } ]\n");
59	} else
60		fprintf(stderr, "Usage: ip link set DEVICE [ { up | down } ]\n");
61
62	fprintf(stderr, "	                  [ arp { on | off } ]\n");
63	fprintf(stderr, "	                  [ dynamic { on | off } ]\n");
64	fprintf(stderr, "	                  [ multicast { on | off } ]\n");
65	fprintf(stderr, "	                  [ allmulticast { on | off } ]\n");
66	fprintf(stderr, "	                  [ promisc { on | off } ]\n");
67	fprintf(stderr, "	                  [ trailers { on | off } ]\n");
68	fprintf(stderr, "	                  [ txqueuelen PACKETS ]\n");
69	fprintf(stderr, "	                  [ name NEWNAME ]\n");
70	fprintf(stderr, "	                  [ address LLADDR ]\n");
71	fprintf(stderr, "	                  [ broadcast LLADDR ]\n");
72	fprintf(stderr, "	                  [ mtu MTU ]\n");
73	fprintf(stderr, "	                  [ netns PID ]\n");
74	fprintf(stderr, "	                  [ netns NAME ]\n");
75	fprintf(stderr, "	                  [ link-netnsid ID ]\n");
76	fprintf(stderr, "			  [ alias NAME ]\n");
77	fprintf(stderr, "	                  [ vf NUM [ mac LLADDR ]\n");
78	fprintf(stderr, "				   [ vlan VLANID [ qos VLAN-QOS ] ]\n");
79
80	fprintf(stderr, "				   [ rate TXRATE ] ] \n");
81
82	fprintf(stderr, "				   [ spoofchk { on | off} ] ] \n");
83	fprintf(stderr, "				   [ query_rss { on | off} ] ] \n");
84	fprintf(stderr, "				   [ state { auto | enable | disable} ] ]\n");
85	fprintf(stderr, "			  [ master DEVICE ]\n");
86	fprintf(stderr, "			  [ nomaster ]\n");
87	fprintf(stderr, "			  [ addrgenmode { eui64 | none } ]\n");
88	fprintf(stderr, "       ip link show [ DEVICE | group GROUP ] [up] [master DEV] [type TYPE]\n");
89
90	if (iplink_have_newlink()) {
91		fprintf(stderr, "       ip link help [ TYPE ]\n");
92		fprintf(stderr, "\n");
93		fprintf(stderr, "TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | macvtap |\n");
94		fprintf(stderr, "          bridge | bond | ipoib | ip6tnl | ipip | sit | vxlan |\n");
95		fprintf(stderr, "          gre | gretap | ip6gre | ip6gretap | vti | nlmon |\n");
96		fprintf(stderr, "          bond_slave | ipvlan }\n");
97	}
98	exit(-1);
99}
100
101static void usage(void)
102{
103	iplink_usage();
104}
105
106static int on_off(const char *msg, const char *realval)
107{
108	fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n", msg, realval);
109	return -1;
110}
111
112static void *BODY;		/* cached dlopen(NULL) handle */
113static struct link_util *linkutil_list;
114
115static struct link_util *__get_link_kind(const char *id, bool slave)
116{
117	void *dlh;
118	char buf[256];
119	struct link_util *l;
120
121	for (l = linkutil_list; l; l = l->next)
122		if (strcmp(l->id, id) == 0 &&
123		    l->slave == slave)
124			return l;
125
126	snprintf(buf, sizeof(buf), LIBDIR "/ip/link_%s.so", id);
127	dlh = dlopen(buf, RTLD_LAZY);
128	if (dlh == NULL) {
129		/* look in current binary, only open once */
130		dlh = BODY;
131		if (dlh == NULL) {
132			dlh = BODY = dlopen(NULL, RTLD_LAZY);
133			if (dlh == NULL)
134				return NULL;
135		}
136	}
137
138	if (slave)
139		snprintf(buf, sizeof(buf), "%s_slave_link_util", id);
140	else
141		snprintf(buf, sizeof(buf), "%s_link_util", id);
142	l = dlsym(dlh, buf);
143	if (l == NULL)
144		return NULL;
145
146	l->next = linkutil_list;
147	linkutil_list = l;
148	return l;
149}
150
151struct link_util *get_link_kind(const char *id)
152{
153	return __get_link_kind(id, false);
154}
155
156struct link_util *get_link_slave_kind(const char *id)
157{
158	return __get_link_kind(id, true);
159}
160
161static int get_link_mode(const char *mode)
162{
163	if (strcasecmp(mode, "default") == 0)
164		return IF_LINK_MODE_DEFAULT;
165	if (strcasecmp(mode, "dormant") == 0)
166		return IF_LINK_MODE_DORMANT;
167	return -1;
168}
169
170static int get_addr_gen_mode(const char *mode)
171{
172	if (strcasecmp(mode, "eui64") == 0)
173		return IN6_ADDR_GEN_MODE_EUI64;
174	if (strcasecmp(mode, "none") == 0)
175		return IN6_ADDR_GEN_MODE_NONE;
176	return -1;
177}
178
179#if IPLINK_IOCTL_COMPAT
180static int have_rtnl_newlink = -1;
181
182static int accept_msg(const struct sockaddr_nl *who,
183		      struct nlmsghdr *n, void *arg)
184{
185	struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
186
187	if (n->nlmsg_type == NLMSG_ERROR &&
188	    (err->error == -EOPNOTSUPP || err->error == -EINVAL))
189		have_rtnl_newlink = 0;
190	else
191		have_rtnl_newlink = 1;
192	return -1;
193}
194
195static int iplink_have_newlink(void)
196{
197	struct {
198		struct nlmsghdr		n;
199		struct ifinfomsg	i;
200		char			buf[1024];
201	} req;
202
203	if (have_rtnl_newlink < 0) {
204		memset(&req, 0, sizeof(req));
205
206		req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
207		req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
208		req.n.nlmsg_type = RTM_NEWLINK;
209		req.i.ifi_family = AF_UNSPEC;
210
211		if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
212			perror("request send failed");
213			exit(1);
214		}
215		rtnl_listen(&rth, accept_msg, NULL);
216	}
217	return have_rtnl_newlink;
218}
219#else /* IPLINK_IOCTL_COMPAT */
220static int iplink_have_newlink(void)
221{
222	return 1;
223}
224#endif /* ! IPLINK_IOCTL_COMPAT */
225
226struct iplink_req {
227	struct nlmsghdr		n;
228	struct ifinfomsg	i;
229	char			buf[1024];
230};
231
232static int iplink_parse_vf(int vf, int *argcp, char ***argvp,
233			   struct iplink_req *req, int dev_index)
234{
235	char new_rate_api = 0, count = 0, override_legacy_rate = 0;
236	struct ifla_vf_rate tivt;
237	int len, argc = *argcp;
238	char **argv = *argvp;
239	struct rtattr *vfinfo;
240
241	tivt.min_tx_rate = -1;
242	tivt.max_tx_rate = -1;
243
244	vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
245
246	while (NEXT_ARG_OK()) {
247		NEXT_ARG();
248		count++;
249		if (!matches(*argv, "max_tx_rate")) {
250			/* new API in use */
251			new_rate_api = 1;
252			/* override legacy rate */
253			override_legacy_rate = 1;
254		} else if (!matches(*argv, "min_tx_rate")) {
255			/* new API in use */
256			new_rate_api = 1;
257		}
258	}
259
260	while (count--) {
261		/* rewind arg */
262		PREV_ARG();
263	}
264
265	while (NEXT_ARG_OK()) {
266		NEXT_ARG();
267		if (matches(*argv, "mac") == 0) {
268			struct ifla_vf_mac ivm;
269			NEXT_ARG();
270			ivm.vf = vf;
271			len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
272			if (len < 0)
273				return -1;
274			addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
275		} else if (matches(*argv, "vlan") == 0) {
276			struct ifla_vf_vlan ivv;
277			NEXT_ARG();
278			if (get_unsigned(&ivv.vlan, *argv, 0)) {
279				invarg("Invalid \"vlan\" value\n", *argv);
280			}
281			ivv.vf = vf;
282			ivv.qos = 0;
283			if (NEXT_ARG_OK()) {
284				NEXT_ARG();
285				if (matches(*argv, "qos") == 0) {
286					NEXT_ARG();
287					if (get_unsigned(&ivv.qos, *argv, 0)) {
288						invarg("Invalid \"qos\" value\n", *argv);
289					}
290				} else {
291					/* rewind arg */
292					PREV_ARG();
293				}
294			}
295			addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
296		} else if (matches(*argv, "rate") == 0) {
297			struct ifla_vf_tx_rate ivt;
298			NEXT_ARG();
299			if (get_unsigned(&ivt.rate, *argv, 0)) {
300				invarg("Invalid \"rate\" value\n", *argv);
301			}
302			ivt.vf = vf;
303			if (!new_rate_api)
304				addattr_l(&req->n, sizeof(*req),
305					  IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
306			else if (!override_legacy_rate)
307				tivt.max_tx_rate = ivt.rate;
308
309		} else if (matches(*argv, "max_tx_rate") == 0) {
310			NEXT_ARG();
311			if (get_unsigned(&tivt.max_tx_rate, *argv, 0))
312				invarg("Invalid \"max tx rate\" value\n",
313				       *argv);
314			tivt.vf = vf;
315
316		} else if (matches(*argv, "min_tx_rate") == 0) {
317			NEXT_ARG();
318			if (get_unsigned(&tivt.min_tx_rate, *argv, 0))
319				invarg("Invalid \"min tx rate\" value\n",
320				       *argv);
321			tivt.vf = vf;
322
323		} else if (matches(*argv, "spoofchk") == 0) {
324			struct ifla_vf_spoofchk ivs;
325			NEXT_ARG();
326			if (matches(*argv, "on") == 0)
327				ivs.setting = 1;
328			else if (matches(*argv, "off") == 0)
329				ivs.setting = 0;
330			else
331				invarg("Invalid \"spoofchk\" value\n", *argv);
332			ivs.vf = vf;
333			addattr_l(&req->n, sizeof(*req), IFLA_VF_SPOOFCHK, &ivs, sizeof(ivs));
334
335		} else if (matches(*argv, "query_rss") == 0) {
336			struct ifla_vf_rss_query_en ivs;
337			NEXT_ARG();
338			if (matches(*argv, "on") == 0)
339				ivs.setting = 1;
340			else if (matches(*argv, "off") == 0)
341				ivs.setting = 0;
342			else
343				invarg("Invalid \"query_rss\" value\n", *argv);
344			ivs.vf = vf;
345			addattr_l(&req->n, sizeof(*req), IFLA_VF_RSS_QUERY_EN, &ivs, sizeof(ivs));
346
347		} else if (matches(*argv, "state") == 0) {
348			struct ifla_vf_link_state ivl;
349			NEXT_ARG();
350			if (matches(*argv, "auto") == 0)
351				ivl.link_state = IFLA_VF_LINK_STATE_AUTO;
352			else if (matches(*argv, "enable") == 0)
353				ivl.link_state = IFLA_VF_LINK_STATE_ENABLE;
354			else if (matches(*argv, "disable") == 0)
355				ivl.link_state = IFLA_VF_LINK_STATE_DISABLE;
356			else
357				invarg("Invalid \"state\" value\n", *argv);
358			ivl.vf = vf;
359			addattr_l(&req->n, sizeof(*req), IFLA_VF_LINK_STATE, &ivl, sizeof(ivl));
360		} else {
361			/* rewind arg */
362			PREV_ARG();
363			break;
364		}
365	}
366
367	if (new_rate_api) {
368		int tmin, tmax;
369
370		if (tivt.min_tx_rate == -1 || tivt.max_tx_rate == -1) {
371			ipaddr_get_vf_rate(tivt.vf, &tmin, &tmax, dev_index);
372			if (tivt.min_tx_rate == -1)
373				tivt.min_tx_rate = tmin;
374			if (tivt.max_tx_rate == -1)
375				tivt.max_tx_rate = tmax;
376		}
377		addattr_l(&req->n, sizeof(*req), IFLA_VF_RATE, &tivt,
378			  sizeof(tivt));
379	}
380
381	if (argc == *argcp)
382		incomplete_command();
383
384	addattr_nest_end(&req->n, vfinfo);
385
386	*argcp = argc;
387	*argvp = argv;
388	return 0;
389}
390
391int iplink_parse(int argc, char **argv, struct iplink_req *req,
392		char **name, char **type, char **link, char **dev, int *group, int *index)
393{
394	int ret, len;
395	char abuf[32];
396	int qlen = -1;
397	int mtu = -1;
398	int netns = -1;
399	int vf = -1;
400	int numtxqueues = -1;
401	int numrxqueues = -1;
402	int dev_index = 0;
403	int link_netnsid = -1;
404
405	*group = -1;
406	ret = argc;
407
408	while (argc > 0) {
409		if (strcmp(*argv, "up") == 0) {
410			req->i.ifi_change |= IFF_UP;
411			req->i.ifi_flags |= IFF_UP;
412		} else if (strcmp(*argv, "down") == 0) {
413			req->i.ifi_change |= IFF_UP;
414			req->i.ifi_flags &= ~IFF_UP;
415		} else if (strcmp(*argv, "name") == 0) {
416			NEXT_ARG();
417			*name = *argv;
418		} else if (strcmp(*argv, "index") == 0) {
419			NEXT_ARG();
420			*index = atoi(*argv);
421			if (*index < 0)
422				invarg("Invalid \"index\" value", *argv);
423		} else if (matches(*argv, "link") == 0) {
424			NEXT_ARG();
425			*link = *argv;
426		} else if (matches(*argv, "address") == 0) {
427			NEXT_ARG();
428			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
429			if (len < 0)
430				return -1;
431			addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
432		} else if (matches(*argv, "broadcast") == 0 ||
433				strcmp(*argv, "brd") == 0) {
434			NEXT_ARG();
435			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
436			if (len < 0)
437				return -1;
438			addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
439		} else if (matches(*argv, "txqueuelen") == 0 ||
440				strcmp(*argv, "qlen") == 0 ||
441				matches(*argv, "txqlen") == 0) {
442			NEXT_ARG();
443			if (qlen != -1)
444				duparg("txqueuelen", *argv);
445			if (get_integer(&qlen,  *argv, 0))
446				invarg("Invalid \"txqueuelen\" value\n", *argv);
447			addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
448		} else if (strcmp(*argv, "mtu") == 0) {
449			NEXT_ARG();
450			if (mtu != -1)
451				duparg("mtu", *argv);
452			if (get_integer(&mtu, *argv, 0))
453				invarg("Invalid \"mtu\" value\n", *argv);
454			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
455		} else if (strcmp(*argv, "netns") == 0) {
456			NEXT_ARG();
457			if (netns != -1)
458				duparg("netns", *argv);
459			if ((netns = netns_get_fd(*argv)) >= 0)
460				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD, &netns, 4);
461			else if (get_integer(&netns, *argv, 0) == 0)
462				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
463			else
464				invarg("Invalid \"netns\" value\n", *argv);
465		} else if (strcmp(*argv, "multicast") == 0) {
466			NEXT_ARG();
467			req->i.ifi_change |= IFF_MULTICAST;
468			if (strcmp(*argv, "on") == 0) {
469				req->i.ifi_flags |= IFF_MULTICAST;
470			} else if (strcmp(*argv, "off") == 0) {
471				req->i.ifi_flags &= ~IFF_MULTICAST;
472			} else
473				return on_off("multicast", *argv);
474		} else if (strcmp(*argv, "allmulticast") == 0) {
475			NEXT_ARG();
476			req->i.ifi_change |= IFF_ALLMULTI;
477			if (strcmp(*argv, "on") == 0) {
478				req->i.ifi_flags |= IFF_ALLMULTI;
479			} else if (strcmp(*argv, "off") == 0) {
480				req->i.ifi_flags &= ~IFF_ALLMULTI;
481			} else
482				return on_off("allmulticast", *argv);
483		} else if (strcmp(*argv, "promisc") == 0) {
484			NEXT_ARG();
485			req->i.ifi_change |= IFF_PROMISC;
486			if (strcmp(*argv, "on") == 0) {
487				req->i.ifi_flags |= IFF_PROMISC;
488			} else if (strcmp(*argv, "off") == 0) {
489				req->i.ifi_flags &= ~IFF_PROMISC;
490			} else
491				return on_off("promisc", *argv);
492		} else if (strcmp(*argv, "trailers") == 0) {
493			NEXT_ARG();
494			req->i.ifi_change |= IFF_NOTRAILERS;
495			if (strcmp(*argv, "off") == 0) {
496				req->i.ifi_flags |= IFF_NOTRAILERS;
497			} else if (strcmp(*argv, "on") == 0) {
498				req->i.ifi_flags &= ~IFF_NOTRAILERS;
499			} else
500				return on_off("trailers", *argv);
501		} else if (strcmp(*argv, "arp") == 0) {
502			NEXT_ARG();
503			req->i.ifi_change |= IFF_NOARP;
504			if (strcmp(*argv, "on") == 0) {
505				req->i.ifi_flags &= ~IFF_NOARP;
506			} else if (strcmp(*argv, "off") == 0) {
507				req->i.ifi_flags |= IFF_NOARP;
508			} else
509				return on_off("noarp", *argv);
510		} else if (strcmp(*argv, "vf") == 0) {
511			struct rtattr *vflist;
512			NEXT_ARG();
513			if (get_integer(&vf,  *argv, 0)) {
514				invarg("Invalid \"vf\" value\n", *argv);
515			}
516			vflist = addattr_nest(&req->n, sizeof(*req),
517					      IFLA_VFINFO_LIST);
518			if (dev_index == 0)
519				missarg("dev");
520
521			len = iplink_parse_vf(vf, &argc, &argv, req, dev_index);
522			if (len < 0)
523				return -1;
524			addattr_nest_end(&req->n, vflist);
525		} else if (matches(*argv, "master") == 0) {
526			int ifindex;
527			NEXT_ARG();
528			ifindex = ll_name_to_index(*argv);
529			if (!ifindex)
530				invarg("Device does not exist\n", *argv);
531			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
532				  &ifindex, 4);
533		} else if (matches(*argv, "nomaster") == 0) {
534			int ifindex = 0;
535			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
536				  &ifindex, 4);
537		} else if (matches(*argv, "dynamic") == 0) {
538			NEXT_ARG();
539			req->i.ifi_change |= IFF_DYNAMIC;
540			if (strcmp(*argv, "on") == 0) {
541				req->i.ifi_flags |= IFF_DYNAMIC;
542			} else if (strcmp(*argv, "off") == 0) {
543				req->i.ifi_flags &= ~IFF_DYNAMIC;
544			} else
545				return on_off("dynamic", *argv);
546		} else if (matches(*argv, "type") == 0) {
547			NEXT_ARG();
548			*type = *argv;
549			argc--; argv++;
550			break;
551		} else if (matches(*argv, "alias") == 0) {
552			NEXT_ARG();
553			addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
554				  *argv, strlen(*argv));
555			argc--; argv++;
556			break;
557		} else if (strcmp(*argv, "group") == 0) {
558			NEXT_ARG();
559			if (*group != -1)
560				duparg("group", *argv);
561			if (rtnl_group_a2n(group, *argv))
562				invarg("Invalid \"group\" value\n", *argv);
563		} else if (strcmp(*argv, "mode") == 0) {
564			int mode;
565			NEXT_ARG();
566			mode = get_link_mode(*argv);
567			if (mode < 0)
568				invarg("Invalid link mode\n", *argv);
569			addattr8(&req->n, sizeof(*req), IFLA_LINKMODE, mode);
570		} else if (strcmp(*argv, "state") == 0) {
571			int state;
572			NEXT_ARG();
573			state = get_operstate(*argv);
574			if (state < 0)
575				invarg("Invalid operstate\n", *argv);
576
577			addattr8(&req->n, sizeof(*req), IFLA_OPERSTATE, state);
578		} else if (matches(*argv, "numtxqueues") == 0) {
579			NEXT_ARG();
580			if (numtxqueues != -1)
581				duparg("numtxqueues", *argv);
582			if (get_integer(&numtxqueues, *argv, 0))
583				invarg("Invalid \"numtxqueues\" value\n", *argv);
584			addattr_l(&req->n, sizeof(*req), IFLA_NUM_TX_QUEUES,
585				  &numtxqueues, 4);
586		} else if (matches(*argv, "numrxqueues") == 0) {
587			NEXT_ARG();
588			if (numrxqueues != -1)
589				duparg("numrxqueues", *argv);
590			if (get_integer(&numrxqueues, *argv, 0))
591				invarg("Invalid \"numrxqueues\" value\n", *argv);
592			addattr_l(&req->n, sizeof(*req), IFLA_NUM_RX_QUEUES,
593				  &numrxqueues, 4);
594		} else if (matches(*argv, "addrgenmode") == 0) {
595			struct rtattr *afs, *afs6;
596			int mode;
597			NEXT_ARG();
598			mode = get_addr_gen_mode(*argv);
599			if (mode < 0)
600				invarg("Invalid address generation mode\n", *argv);
601			afs = addattr_nest(&req->n, sizeof(*req), IFLA_AF_SPEC);
602			afs6 = addattr_nest(&req->n, sizeof(*req), AF_INET6);
603			addattr8(&req->n, sizeof(*req), IFLA_INET6_ADDR_GEN_MODE, mode);
604			addattr_nest_end(&req->n, afs6);
605			addattr_nest_end(&req->n, afs);
606		} else if (matches(*argv, "link-netnsid") == 0) {
607			NEXT_ARG();
608			if (link_netnsid != -1)
609				duparg("link-netnsid", *argv);
610			if (get_integer(&link_netnsid, *argv, 0))
611				invarg("Invalid \"link-netnsid\" value\n", *argv);
612			addattr32(&req->n, sizeof(*req), IFLA_LINK_NETNSID,
613				  link_netnsid);
614		} else {
615			if (strcmp(*argv, "dev") == 0) {
616				NEXT_ARG();
617			}
618			if (matches(*argv, "help") == 0)
619				usage();
620			if (*dev)
621				duparg2("dev", *argv);
622			*dev = *argv;
623			dev_index = ll_name_to_index(*dev);
624		}
625		argc--; argv++;
626	}
627
628	return ret - argc;
629}
630
631static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
632{
633	int len;
634	char *dev = NULL;
635	char *name = NULL;
636	char *link = NULL;
637	char *type = NULL;
638	int index = -1;
639	int group;
640	struct link_util *lu = NULL;
641	struct iplink_req req;
642	int ret;
643
644	memset(&req, 0, sizeof(req));
645
646	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
647	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
648	req.n.nlmsg_type = cmd;
649	req.i.ifi_family = preferred_family;
650
651	ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group, &index);
652	if (ret < 0)
653		return ret;
654
655	argc -= ret;
656	argv += ret;
657
658	if (group != -1) {
659		if (dev)
660			addattr_l(&req.n, sizeof(req), IFLA_GROUP,
661					&group, sizeof(group));
662		else {
663			if (argc) {
664				fprintf(stderr, "Garbage instead of arguments "
665						"\"%s ...\". Try \"ip link "
666						"help\".\n", *argv);
667				return -1;
668			}
669			if (flags & NLM_F_CREATE) {
670				fprintf(stderr, "group cannot be used when "
671						"creating devices.\n");
672				return -1;
673			}
674
675			req.i.ifi_index = 0;
676			addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
677			if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
678				exit(2);
679			return 0;
680		}
681	}
682
683	if (!(flags & NLM_F_CREATE)) {
684		if (!dev) {
685			fprintf(stderr, "Not enough information: \"dev\" "
686					"argument is required.\n");
687			exit(-1);
688		}
689		if (cmd == RTM_NEWLINK && index != -1) {
690			fprintf(stderr, "index can be used only when "
691					"creating devices.\n");
692			exit(-1);
693		}
694
695		req.i.ifi_index = ll_name_to_index(dev);
696		if (req.i.ifi_index == 0) {
697			fprintf(stderr, "Cannot find device \"%s\"\n", dev);
698			return -1;
699		}
700	} else {
701		/* Allow "ip link add dev" and "ip link add name" */
702		if (!name)
703			name = dev;
704
705		if (link) {
706			int ifindex;
707
708			ifindex = ll_name_to_index(link);
709			if (ifindex == 0) {
710				fprintf(stderr, "Cannot find device \"%s\"\n",
711					link);
712				return -1;
713			}
714			addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
715		}
716
717		if (index == -1)
718			req.i.ifi_index = 0;
719		else
720			req.i.ifi_index = index;
721	}
722
723	if (name) {
724		len = strlen(name) + 1;
725		if (len == 1)
726			invarg("\"\" is not a valid device identifier\n", "name");
727		if (len > IFNAMSIZ)
728			invarg("\"name\" too long\n", name);
729		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
730	}
731
732	if (type) {
733		struct rtattr *linkinfo;
734		char slavebuf[128], *ulinep = strchr(type, '_');
735		int iflatype;
736
737		linkinfo = addattr_nest(&req.n, sizeof(req), IFLA_LINKINFO);
738		addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
739			 strlen(type));
740
741		if (ulinep && !strcmp(ulinep, "_slave")) {
742			strncpy(slavebuf, type, sizeof(slavebuf));
743			slavebuf[sizeof(slavebuf) - 1] = '\0';
744			ulinep = strchr(slavebuf, '_');
745			/* check in case it was after sizeof(slavebuf) - 1*/
746			if (ulinep)
747				*ulinep = '\0';
748			lu = get_link_slave_kind(slavebuf);
749			iflatype = IFLA_INFO_SLAVE_DATA;
750		} else {
751			lu = get_link_kind(type);
752			iflatype = IFLA_INFO_DATA;
753		}
754		if (lu && argc) {
755			struct rtattr *data = addattr_nest(&req.n, sizeof(req), iflatype);
756
757			if (lu->parse_opt &&
758			    lu->parse_opt(lu, argc, argv, &req.n))
759				return -1;
760
761			addattr_nest_end(&req.n, data);
762		} else if (argc) {
763			if (matches(*argv, "help") == 0)
764				usage();
765			fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
766					"Try \"ip link help\".\n", *argv);
767			return -1;
768		}
769		addattr_nest_end(&req.n, linkinfo);
770	} else if (flags & NLM_F_CREATE) {
771		fprintf(stderr, "Not enough information: \"type\" argument "
772				"is required\n");
773		return -1;
774	}
775
776	if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
777		exit(2);
778
779	return 0;
780}
781
782int iplink_get(unsigned int flags, char *name, __u32 filt_mask)
783{
784	int len;
785	struct iplink_req req;
786	char answer[16384];
787
788	memset(&req, 0, sizeof(req));
789
790	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
791	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
792	req.n.nlmsg_type = RTM_GETLINK;
793	req.i.ifi_family = preferred_family;
794
795	if (name) {
796		len = strlen(name) + 1;
797		if (len == 1)
798			invarg("\"\" is not a valid device identifier\n",
799				   "name");
800		if (len > IFNAMSIZ)
801			invarg("\"name\" too long\n", name);
802		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
803	}
804	addattr32(&req.n, sizeof(req), IFLA_EXT_MASK, filt_mask);
805
806	if (rtnl_talk(&rth, &req.n, 0, 0, (struct nlmsghdr *)answer) < 0)
807		return -2;
808
809	print_linkinfo(NULL, (struct nlmsghdr *)answer, stdout);
810
811	return 0;
812}
813
814#if IPLINK_IOCTL_COMPAT
815static int get_ctl_fd(void)
816{
817	int s_errno;
818	int fd;
819
820	fd = socket(PF_INET, SOCK_DGRAM, 0);
821	if (fd >= 0)
822		return fd;
823	s_errno = errno;
824	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
825	if (fd >= 0)
826		return fd;
827	fd = socket(PF_INET6, SOCK_DGRAM, 0);
828	if (fd >= 0)
829		return fd;
830	errno = s_errno;
831	perror("Cannot create control socket");
832	return -1;
833}
834
835static int do_chflags(const char *dev, __u32 flags, __u32 mask)
836{
837	struct ifreq ifr;
838	int fd;
839	int err;
840
841	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
842	fd = get_ctl_fd();
843	if (fd < 0)
844		return -1;
845	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
846	if (err) {
847		perror("SIOCGIFFLAGS");
848		close(fd);
849		return -1;
850	}
851	if ((ifr.ifr_flags^flags)&mask) {
852		ifr.ifr_flags &= ~mask;
853		ifr.ifr_flags |= mask&flags;
854		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
855		if (err)
856			perror("SIOCSIFFLAGS");
857	}
858	close(fd);
859	return err;
860}
861
862static int do_changename(const char *dev, const char *newdev)
863{
864	struct ifreq ifr;
865	int fd;
866	int err;
867
868	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
869	strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
870	fd = get_ctl_fd();
871	if (fd < 0)
872		return -1;
873	err = ioctl(fd, SIOCSIFNAME, &ifr);
874	if (err) {
875		perror("SIOCSIFNAME");
876		close(fd);
877		return -1;
878	}
879	close(fd);
880	return err;
881}
882
883static int set_qlen(const char *dev, int qlen)
884{
885	struct ifreq ifr;
886	int s;
887
888	s = get_ctl_fd();
889	if (s < 0)
890		return -1;
891
892	memset(&ifr, 0, sizeof(ifr));
893	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
894	ifr.ifr_qlen = qlen;
895	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
896		perror("SIOCSIFXQLEN");
897		close(s);
898		return -1;
899	}
900	close(s);
901
902	return 0;
903}
904
905static int set_mtu(const char *dev, int mtu)
906{
907	struct ifreq ifr;
908	int s;
909
910	s = get_ctl_fd();
911	if (s < 0)
912		return -1;
913
914	memset(&ifr, 0, sizeof(ifr));
915	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
916	ifr.ifr_mtu = mtu;
917	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
918		perror("SIOCSIFMTU");
919		close(s);
920		return -1;
921	}
922	close(s);
923
924	return 0;
925}
926
927static int get_address(const char *dev, int *htype)
928{
929	struct ifreq ifr;
930	struct sockaddr_ll me;
931	socklen_t alen;
932	int s;
933
934	s = socket(PF_PACKET, SOCK_DGRAM, 0);
935	if (s < 0) {
936		perror("socket(PF_PACKET)");
937		return -1;
938	}
939
940	memset(&ifr, 0, sizeof(ifr));
941	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
942	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
943		perror("SIOCGIFINDEX");
944		close(s);
945		return -1;
946	}
947
948	memset(&me, 0, sizeof(me));
949	me.sll_family = AF_PACKET;
950	me.sll_ifindex = ifr.ifr_ifindex;
951	me.sll_protocol = htons(ETH_P_LOOP);
952	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
953		perror("bind");
954		close(s);
955		return -1;
956	}
957
958	alen = sizeof(me);
959	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
960		perror("getsockname");
961		close(s);
962		return -1;
963	}
964	close(s);
965	*htype = me.sll_hatype;
966	return me.sll_halen;
967}
968
969static int parse_address(const char *dev, int hatype, int halen,
970		char *lla, struct ifreq *ifr)
971{
972	int alen;
973
974	memset(ifr, 0, sizeof(*ifr));
975	strncpy(ifr->ifr_name, dev, IFNAMSIZ);
976	ifr->ifr_hwaddr.sa_family = hatype;
977	alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
978	if (alen < 0)
979		return -1;
980	if (alen != halen) {
981		fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
982		return -1;
983	}
984	return 0;
985}
986
987static int set_address(struct ifreq *ifr, int brd)
988{
989	int s;
990
991	s = get_ctl_fd();
992	if (s < 0)
993		return -1;
994	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
995		perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
996		close(s);
997		return -1;
998	}
999	close(s);
1000	return 0;
1001}
1002
1003static int do_set(int argc, char **argv)
1004{
1005	char *dev = NULL;
1006	__u32 mask = 0;
1007	__u32 flags = 0;
1008	int qlen = -1;
1009	int mtu = -1;
1010	char *newaddr = NULL;
1011	char *newbrd = NULL;
1012	struct ifreq ifr0, ifr1;
1013	char *newname = NULL;
1014	int htype, halen;
1015
1016	while (argc > 0) {
1017		if (strcmp(*argv, "up") == 0) {
1018			mask |= IFF_UP;
1019			flags |= IFF_UP;
1020		} else if (strcmp(*argv, "down") == 0) {
1021			mask |= IFF_UP;
1022			flags &= ~IFF_UP;
1023		} else if (strcmp(*argv, "name") == 0) {
1024			NEXT_ARG();
1025			newname = *argv;
1026		} else if (matches(*argv, "address") == 0) {
1027			NEXT_ARG();
1028			newaddr = *argv;
1029		} else if (matches(*argv, "broadcast") == 0 ||
1030			   strcmp(*argv, "brd") == 0) {
1031			NEXT_ARG();
1032			newbrd = *argv;
1033		} else if (matches(*argv, "txqueuelen") == 0 ||
1034			   strcmp(*argv, "qlen") == 0 ||
1035			   matches(*argv, "txqlen") == 0) {
1036			NEXT_ARG();
1037			if (qlen != -1)
1038				duparg("txqueuelen", *argv);
1039			if (get_integer(&qlen,  *argv, 0))
1040				invarg("Invalid \"txqueuelen\" value\n", *argv);
1041		} else if (strcmp(*argv, "mtu") == 0) {
1042			NEXT_ARG();
1043			if (mtu != -1)
1044				duparg("mtu", *argv);
1045			if (get_integer(&mtu, *argv, 0))
1046				invarg("Invalid \"mtu\" value\n", *argv);
1047		} else if (strcmp(*argv, "multicast") == 0) {
1048			NEXT_ARG();
1049			mask |= IFF_MULTICAST;
1050			if (strcmp(*argv, "on") == 0) {
1051				flags |= IFF_MULTICAST;
1052			} else if (strcmp(*argv, "off") == 0) {
1053				flags &= ~IFF_MULTICAST;
1054			} else
1055				return on_off("multicast", *argv);
1056		} else if (strcmp(*argv, "allmulticast") == 0) {
1057			NEXT_ARG();
1058			mask |= IFF_ALLMULTI;
1059			if (strcmp(*argv, "on") == 0) {
1060				flags |= IFF_ALLMULTI;
1061			} else if (strcmp(*argv, "off") == 0) {
1062				flags &= ~IFF_ALLMULTI;
1063			} else
1064				return on_off("allmulticast", *argv);
1065		} else if (strcmp(*argv, "promisc") == 0) {
1066			NEXT_ARG();
1067			mask |= IFF_PROMISC;
1068			if (strcmp(*argv, "on") == 0) {
1069				flags |= IFF_PROMISC;
1070			} else if (strcmp(*argv, "off") == 0) {
1071				flags &= ~IFF_PROMISC;
1072			} else
1073				return on_off("promisc", *argv);
1074		} else if (strcmp(*argv, "trailers") == 0) {
1075			NEXT_ARG();
1076			mask |= IFF_NOTRAILERS;
1077			if (strcmp(*argv, "off") == 0) {
1078				flags |= IFF_NOTRAILERS;
1079			} else if (strcmp(*argv, "on") == 0) {
1080				flags &= ~IFF_NOTRAILERS;
1081			} else
1082				return on_off("trailers", *argv);
1083		} else if (strcmp(*argv, "arp") == 0) {
1084			NEXT_ARG();
1085			mask |= IFF_NOARP;
1086			if (strcmp(*argv, "on") == 0) {
1087				flags &= ~IFF_NOARP;
1088			} else if (strcmp(*argv, "off") == 0) {
1089				flags |= IFF_NOARP;
1090			} else
1091				return on_off("noarp", *argv);
1092		} else if (matches(*argv, "dynamic") == 0) {
1093			NEXT_ARG();
1094			mask |= IFF_DYNAMIC;
1095			if (strcmp(*argv, "on") == 0) {
1096				flags |= IFF_DYNAMIC;
1097			} else if (strcmp(*argv, "off") == 0) {
1098				flags &= ~IFF_DYNAMIC;
1099			} else
1100				return on_off("dynamic", *argv);
1101		} else {
1102			if (strcmp(*argv, "dev") == 0) {
1103				NEXT_ARG();
1104			}
1105			if (matches(*argv, "help") == 0)
1106				usage();
1107			if (dev)
1108				duparg2("dev", *argv);
1109			dev = *argv;
1110		}
1111		argc--; argv++;
1112	}
1113
1114	if (!dev) {
1115		fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
1116		exit(-1);
1117	}
1118
1119	if (newaddr || newbrd) {
1120		halen = get_address(dev, &htype);
1121		if (halen < 0)
1122			return -1;
1123		if (newaddr) {
1124			if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
1125				return -1;
1126		}
1127		if (newbrd) {
1128			if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
1129				return -1;
1130		}
1131	}
1132
1133	if (newname && strcmp(dev, newname)) {
1134		if (strlen(newname) == 0)
1135			invarg("\"\" is not a valid device identifier\n", "name");
1136		if (do_changename(dev, newname) < 0)
1137			return -1;
1138		dev = newname;
1139	}
1140	if (qlen != -1) {
1141		if (set_qlen(dev, qlen) < 0)
1142			return -1;
1143	}
1144	if (mtu != -1) {
1145		if (set_mtu(dev, mtu) < 0)
1146			return -1;
1147	}
1148	if (newaddr || newbrd) {
1149		if (newbrd) {
1150			if (set_address(&ifr1, 1) < 0)
1151				return -1;
1152		}
1153		if (newaddr) {
1154			if (set_address(&ifr0, 0) < 0)
1155				return -1;
1156		}
1157	}
1158	if (mask)
1159		return do_chflags(dev, flags, mask);
1160	return 0;
1161}
1162#endif /* IPLINK_IOCTL_COMPAT */
1163
1164static void do_help(int argc, char **argv)
1165{
1166	struct link_util *lu = NULL;
1167
1168	if (argc <= 0) {
1169		usage();
1170		return ;
1171	}
1172
1173	lu = get_link_kind(*argv);
1174
1175	if (lu && lu->print_help)
1176		lu->print_help(lu, argc-1, argv+1, stdout);
1177	else
1178		usage();
1179}
1180
1181int do_iplink(int argc, char **argv)
1182{
1183	if (argc > 0) {
1184		if (iplink_have_newlink()) {
1185			if (matches(*argv, "add") == 0)
1186				return iplink_modify(RTM_NEWLINK,
1187						     NLM_F_CREATE|NLM_F_EXCL,
1188						     argc-1, argv+1);
1189			if (matches(*argv, "set") == 0 ||
1190			    matches(*argv, "change") == 0)
1191				return iplink_modify(RTM_NEWLINK, 0,
1192						     argc-1, argv+1);
1193			if (matches(*argv, "replace") == 0)
1194				return iplink_modify(RTM_NEWLINK,
1195						     NLM_F_CREATE|NLM_F_REPLACE,
1196						     argc-1, argv+1);
1197			if (matches(*argv, "delete") == 0)
1198				return iplink_modify(RTM_DELLINK, 0,
1199						     argc-1, argv+1);
1200		} else {
1201#if IPLINK_IOCTL_COMPAT
1202			if (matches(*argv, "set") == 0)
1203				return do_set(argc-1, argv+1);
1204#endif
1205		}
1206		if (matches(*argv, "show") == 0 ||
1207		    matches(*argv, "lst") == 0 ||
1208		    matches(*argv, "list") == 0)
1209			return ipaddr_list_link(argc-1, argv+1);
1210		if (matches(*argv, "help") == 0) {
1211			do_help(argc-1, argv+1);
1212			return 0;
1213		}
1214	} else
1215		return ipaddr_list_link(0, NULL);
1216
1217	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
1218	exit(-1);
1219}
1220