iplink.c revision 8916ccf66cec59e4e1c1bd4d79a9342b0569d89c 
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, "				   [ state { auto | enable | disable} ] ]\n");
84	fprintf(stderr, "			  [ master DEVICE ]\n");
85	fprintf(stderr, "			  [ nomaster ]\n");
86	fprintf(stderr, "			  [ addrgenmode { eui64 | none } ]\n");
87	fprintf(stderr, "       ip link show [ DEVICE | group GROUP ] [up] [master DEV] [type TYPE]\n");
88
89	if (iplink_have_newlink()) {
90		fprintf(stderr, "       ip link help [ TYPE ]\n");
91		fprintf(stderr, "\n");
92		fprintf(stderr, "TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | macvtap |\n");
93		fprintf(stderr, "          bridge | bond | ipoib | ip6tnl | ipip | sit | vxlan |\n");
94		fprintf(stderr, "          gre | gretap | ip6gre | ip6gretap | vti | nlmon |\n");
95		fprintf(stderr, "          bond_slave | ipvlan }\n");
96	}
97	exit(-1);
98}
99
100static void usage(void)
101{
102	iplink_usage();
103}
104
105static int on_off(const char *msg, const char *realval)
106{
107	fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\", not \"%s\"\n", msg, realval);
108	return -1;
109}
110
111static void *BODY;		/* cached dlopen(NULL) handle */
112static struct link_util *linkutil_list;
113
114static struct link_util *__get_link_kind(const char *id, bool slave)
115{
116	void *dlh;
117	char buf[256];
118	struct link_util *l;
119
120	for (l = linkutil_list; l; l = l->next)
121		if (strcmp(l->id, id) == 0 &&
122		    l->slave == slave)
123			return l;
124
125	snprintf(buf, sizeof(buf), LIBDIR "/ip/link_%s.so", id);
126	dlh = dlopen(buf, RTLD_LAZY);
127	if (dlh == NULL) {
128		/* look in current binary, only open once */
129		dlh = BODY;
130		if (dlh == NULL) {
131			dlh = BODY = dlopen(NULL, RTLD_LAZY);
132			if (dlh == NULL)
133				return NULL;
134		}
135	}
136
137	if (slave)
138		snprintf(buf, sizeof(buf), "%s_slave_link_util", id);
139	else
140		snprintf(buf, sizeof(buf), "%s_link_util", id);
141	l = dlsym(dlh, buf);
142	if (l == NULL)
143		return NULL;
144
145	l->next = linkutil_list;
146	linkutil_list = l;
147	return l;
148}
149
150struct link_util *get_link_kind(const char *id)
151{
152	return __get_link_kind(id, false);
153}
154
155struct link_util *get_link_slave_kind(const char *id)
156{
157	return __get_link_kind(id, true);
158}
159
160static int get_link_mode(const char *mode)
161{
162	if (strcasecmp(mode, "default") == 0)
163		return IF_LINK_MODE_DEFAULT;
164	if (strcasecmp(mode, "dormant") == 0)
165		return IF_LINK_MODE_DORMANT;
166	return -1;
167}
168
169static int get_addr_gen_mode(const char *mode)
170{
171	if (strcasecmp(mode, "eui64") == 0)
172		return IN6_ADDR_GEN_MODE_EUI64;
173	if (strcasecmp(mode, "none") == 0)
174		return IN6_ADDR_GEN_MODE_NONE;
175	return -1;
176}
177
178#if IPLINK_IOCTL_COMPAT
179static int have_rtnl_newlink = -1;
180
181static int accept_msg(const struct sockaddr_nl *who,
182		      struct nlmsghdr *n, void *arg)
183{
184	struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
185
186	if (n->nlmsg_type == NLMSG_ERROR &&
187	    (err->error == -EOPNOTSUPP || err->error == -EINVAL))
188		have_rtnl_newlink = 0;
189	else
190		have_rtnl_newlink = 1;
191	return -1;
192}
193
194static int iplink_have_newlink(void)
195{
196	struct {
197		struct nlmsghdr		n;
198		struct ifinfomsg	i;
199		char			buf[1024];
200	} req;
201
202	if (have_rtnl_newlink < 0) {
203		memset(&req, 0, sizeof(req));
204
205		req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
206		req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
207		req.n.nlmsg_type = RTM_NEWLINK;
208		req.i.ifi_family = AF_UNSPEC;
209
210		if (rtnl_send(&rth, &req.n, req.n.nlmsg_len) < 0) {
211			perror("request send failed");
212			exit(1);
213		}
214		rtnl_listen(&rth, accept_msg, NULL);
215	}
216	return have_rtnl_newlink;
217}
218#else /* IPLINK_IOCTL_COMPAT */
219static int iplink_have_newlink(void)
220{
221	return 1;
222}
223#endif /* ! IPLINK_IOCTL_COMPAT */
224
225struct iplink_req {
226	struct nlmsghdr		n;
227	struct ifinfomsg	i;
228	char			buf[1024];
229};
230
231static int iplink_parse_vf(int vf, int *argcp, char ***argvp,
232			   struct iplink_req *req, int dev_index)
233{
234	char new_rate_api = 0, count = 0, override_legacy_rate = 0;
235	struct ifla_vf_rate tivt;
236	int len, argc = *argcp;
237	char **argv = *argvp;
238	struct rtattr *vfinfo;
239
240	tivt.min_tx_rate = -1;
241	tivt.max_tx_rate = -1;
242
243	vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
244
245	while (NEXT_ARG_OK()) {
246		NEXT_ARG();
247		count++;
248		if (!matches(*argv, "max_tx_rate")) {
249			/* new API in use */
250			new_rate_api = 1;
251			/* override legacy rate */
252			override_legacy_rate = 1;
253		} else if (!matches(*argv, "min_tx_rate")) {
254			/* new API in use */
255			new_rate_api = 1;
256		}
257	}
258
259	while (count--) {
260		/* rewind arg */
261		PREV_ARG();
262	}
263
264	while (NEXT_ARG_OK()) {
265		NEXT_ARG();
266		if (matches(*argv, "mac") == 0) {
267			struct ifla_vf_mac ivm;
268			NEXT_ARG();
269			ivm.vf = vf;
270			len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
271			if (len < 0)
272				return -1;
273			addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
274		} else if (matches(*argv, "vlan") == 0) {
275			struct ifla_vf_vlan ivv;
276			NEXT_ARG();
277			if (get_unsigned(&ivv.vlan, *argv, 0)) {
278				invarg("Invalid \"vlan\" value\n", *argv);
279			}
280			ivv.vf = vf;
281			ivv.qos = 0;
282			if (NEXT_ARG_OK()) {
283				NEXT_ARG();
284				if (matches(*argv, "qos") == 0) {
285					NEXT_ARG();
286					if (get_unsigned(&ivv.qos, *argv, 0)) {
287						invarg("Invalid \"qos\" value\n", *argv);
288					}
289				} else {
290					/* rewind arg */
291					PREV_ARG();
292				}
293			}
294			addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
295		} else if (matches(*argv, "rate") == 0) {
296			struct ifla_vf_tx_rate ivt;
297			NEXT_ARG();
298			if (get_unsigned(&ivt.rate, *argv, 0)) {
299				invarg("Invalid \"rate\" value\n", *argv);
300			}
301			ivt.vf = vf;
302			if (!new_rate_api)
303				addattr_l(&req->n, sizeof(*req),
304					  IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
305			else if (!override_legacy_rate)
306				tivt.max_tx_rate = ivt.rate;
307
308		} else if (matches(*argv, "max_tx_rate") == 0) {
309			NEXT_ARG();
310			if (get_unsigned(&tivt.max_tx_rate, *argv, 0))
311				invarg("Invalid \"max tx rate\" value\n",
312				       *argv);
313			tivt.vf = vf;
314
315		} else if (matches(*argv, "min_tx_rate") == 0) {
316			NEXT_ARG();
317			if (get_unsigned(&tivt.min_tx_rate, *argv, 0))
318				invarg("Invalid \"min tx rate\" value\n",
319				       *argv);
320			tivt.vf = vf;
321
322		} else if (matches(*argv, "spoofchk") == 0) {
323			struct ifla_vf_spoofchk ivs;
324			NEXT_ARG();
325			if (matches(*argv, "on") == 0)
326				ivs.setting = 1;
327			else if (matches(*argv, "off") == 0)
328				ivs.setting = 0;
329			else
330				invarg("Invalid \"spoofchk\" value\n", *argv);
331			ivs.vf = vf;
332			addattr_l(&req->n, sizeof(*req), IFLA_VF_SPOOFCHK, &ivs, sizeof(ivs));
333
334		} else if (matches(*argv, "state") == 0) {
335			struct ifla_vf_link_state ivl;
336			NEXT_ARG();
337			if (matches(*argv, "auto") == 0)
338				ivl.link_state = IFLA_VF_LINK_STATE_AUTO;
339			else if (matches(*argv, "enable") == 0)
340				ivl.link_state = IFLA_VF_LINK_STATE_ENABLE;
341			else if (matches(*argv, "disable") == 0)
342				ivl.link_state = IFLA_VF_LINK_STATE_DISABLE;
343			else
344				invarg("Invalid \"state\" value\n", *argv);
345			ivl.vf = vf;
346			addattr_l(&req->n, sizeof(*req), IFLA_VF_LINK_STATE, &ivl, sizeof(ivl));
347		} else {
348			/* rewind arg */
349			PREV_ARG();
350			break;
351		}
352	}
353
354	if (new_rate_api) {
355		int tmin, tmax;
356
357		if (tivt.min_tx_rate == -1 || tivt.max_tx_rate == -1) {
358			ipaddr_get_vf_rate(tivt.vf, &tmin, &tmax, dev_index);
359			if (tivt.min_tx_rate == -1)
360				tivt.min_tx_rate = tmin;
361			if (tivt.max_tx_rate == -1)
362				tivt.max_tx_rate = tmax;
363		}
364		addattr_l(&req->n, sizeof(*req), IFLA_VF_RATE, &tivt,
365			  sizeof(tivt));
366	}
367
368	if (argc == *argcp)
369		incomplete_command();
370
371	addattr_nest_end(&req->n, vfinfo);
372
373	*argcp = argc;
374	*argvp = argv;
375	return 0;
376}
377
378int iplink_parse(int argc, char **argv, struct iplink_req *req,
379		char **name, char **type, char **link, char **dev, int *group, int *index)
380{
381	int ret, len;
382	char abuf[32];
383	int qlen = -1;
384	int mtu = -1;
385	int netns = -1;
386	int vf = -1;
387	int numtxqueues = -1;
388	int numrxqueues = -1;
389	int dev_index = 0;
390	int link_netnsid = -1;
391
392	*group = -1;
393	ret = argc;
394
395	while (argc > 0) {
396		if (strcmp(*argv, "up") == 0) {
397			req->i.ifi_change |= IFF_UP;
398			req->i.ifi_flags |= IFF_UP;
399		} else if (strcmp(*argv, "down") == 0) {
400			req->i.ifi_change |= IFF_UP;
401			req->i.ifi_flags &= ~IFF_UP;
402		} else if (strcmp(*argv, "name") == 0) {
403			NEXT_ARG();
404			*name = *argv;
405		} else if (strcmp(*argv, "index") == 0) {
406			NEXT_ARG();
407			*index = atoi(*argv);
408			if (*index < 0)
409				invarg("Invalid \"index\" value", *argv);
410		} else if (matches(*argv, "link") == 0) {
411			NEXT_ARG();
412			*link = *argv;
413		} else if (matches(*argv, "address") == 0) {
414			NEXT_ARG();
415			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
416			if (len < 0)
417				return -1;
418			addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
419		} else if (matches(*argv, "broadcast") == 0 ||
420				strcmp(*argv, "brd") == 0) {
421			NEXT_ARG();
422			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
423			if (len < 0)
424				return -1;
425			addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
426		} else if (matches(*argv, "txqueuelen") == 0 ||
427				strcmp(*argv, "qlen") == 0 ||
428				matches(*argv, "txqlen") == 0) {
429			NEXT_ARG();
430			if (qlen != -1)
431				duparg("txqueuelen", *argv);
432			if (get_integer(&qlen,  *argv, 0))
433				invarg("Invalid \"txqueuelen\" value\n", *argv);
434			addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
435		} else if (strcmp(*argv, "mtu") == 0) {
436			NEXT_ARG();
437			if (mtu != -1)
438				duparg("mtu", *argv);
439			if (get_integer(&mtu, *argv, 0))
440				invarg("Invalid \"mtu\" value\n", *argv);
441			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
442		} else if (strcmp(*argv, "netns") == 0) {
443			NEXT_ARG();
444			if (netns != -1)
445				duparg("netns", *argv);
446			if ((netns = netns_get_fd(*argv)) >= 0)
447				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD, &netns, 4);
448			else if (get_integer(&netns, *argv, 0) == 0)
449				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
450			else
451				invarg("Invalid \"netns\" value\n", *argv);
452		} else if (strcmp(*argv, "multicast") == 0) {
453			NEXT_ARG();
454			req->i.ifi_change |= IFF_MULTICAST;
455			if (strcmp(*argv, "on") == 0) {
456				req->i.ifi_flags |= IFF_MULTICAST;
457			} else if (strcmp(*argv, "off") == 0) {
458				req->i.ifi_flags &= ~IFF_MULTICAST;
459			} else
460				return on_off("multicast", *argv);
461		} else if (strcmp(*argv, "allmulticast") == 0) {
462			NEXT_ARG();
463			req->i.ifi_change |= IFF_ALLMULTI;
464			if (strcmp(*argv, "on") == 0) {
465				req->i.ifi_flags |= IFF_ALLMULTI;
466			} else if (strcmp(*argv, "off") == 0) {
467				req->i.ifi_flags &= ~IFF_ALLMULTI;
468			} else
469				return on_off("allmulticast", *argv);
470		} else if (strcmp(*argv, "promisc") == 0) {
471			NEXT_ARG();
472			req->i.ifi_change |= IFF_PROMISC;
473			if (strcmp(*argv, "on") == 0) {
474				req->i.ifi_flags |= IFF_PROMISC;
475			} else if (strcmp(*argv, "off") == 0) {
476				req->i.ifi_flags &= ~IFF_PROMISC;
477			} else
478				return on_off("promisc", *argv);
479		} else if (strcmp(*argv, "trailers") == 0) {
480			NEXT_ARG();
481			req->i.ifi_change |= IFF_NOTRAILERS;
482			if (strcmp(*argv, "off") == 0) {
483				req->i.ifi_flags |= IFF_NOTRAILERS;
484			} else if (strcmp(*argv, "on") == 0) {
485				req->i.ifi_flags &= ~IFF_NOTRAILERS;
486			} else
487				return on_off("trailers", *argv);
488		} else if (strcmp(*argv, "arp") == 0) {
489			NEXT_ARG();
490			req->i.ifi_change |= IFF_NOARP;
491			if (strcmp(*argv, "on") == 0) {
492				req->i.ifi_flags &= ~IFF_NOARP;
493			} else if (strcmp(*argv, "off") == 0) {
494				req->i.ifi_flags |= IFF_NOARP;
495			} else
496				return on_off("noarp", *argv);
497		} else if (strcmp(*argv, "vf") == 0) {
498			struct rtattr *vflist;
499			NEXT_ARG();
500			if (get_integer(&vf,  *argv, 0)) {
501				invarg("Invalid \"vf\" value\n", *argv);
502			}
503			vflist = addattr_nest(&req->n, sizeof(*req),
504					      IFLA_VFINFO_LIST);
505			if (dev_index == 0)
506				missarg("dev");
507
508			len = iplink_parse_vf(vf, &argc, &argv, req, dev_index);
509			if (len < 0)
510				return -1;
511			addattr_nest_end(&req->n, vflist);
512		} else if (matches(*argv, "master") == 0) {
513			int ifindex;
514			NEXT_ARG();
515			ifindex = ll_name_to_index(*argv);
516			if (!ifindex)
517				invarg("Device does not exist\n", *argv);
518			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
519				  &ifindex, 4);
520		} else if (matches(*argv, "nomaster") == 0) {
521			int ifindex = 0;
522			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
523				  &ifindex, 4);
524		} else if (matches(*argv, "dynamic") == 0) {
525			NEXT_ARG();
526			req->i.ifi_change |= IFF_DYNAMIC;
527			if (strcmp(*argv, "on") == 0) {
528				req->i.ifi_flags |= IFF_DYNAMIC;
529			} else if (strcmp(*argv, "off") == 0) {
530				req->i.ifi_flags &= ~IFF_DYNAMIC;
531			} else
532				return on_off("dynamic", *argv);
533		} else if (matches(*argv, "type") == 0) {
534			NEXT_ARG();
535			*type = *argv;
536			argc--; argv++;
537			break;
538		} else if (matches(*argv, "alias") == 0) {
539			NEXT_ARG();
540			addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
541				  *argv, strlen(*argv));
542			argc--; argv++;
543			break;
544		} else if (strcmp(*argv, "group") == 0) {
545			NEXT_ARG();
546			if (*group != -1)
547				duparg("group", *argv);
548			if (rtnl_group_a2n(group, *argv))
549				invarg("Invalid \"group\" value\n", *argv);
550		} else if (strcmp(*argv, "mode") == 0) {
551			int mode;
552			NEXT_ARG();
553			mode = get_link_mode(*argv);
554			if (mode < 0)
555				invarg("Invalid link mode\n", *argv);
556			addattr8(&req->n, sizeof(*req), IFLA_LINKMODE, mode);
557		} else if (strcmp(*argv, "state") == 0) {
558			int state;
559			NEXT_ARG();
560			state = get_operstate(*argv);
561			if (state < 0)
562				invarg("Invalid operstate\n", *argv);
563
564			addattr8(&req->n, sizeof(*req), IFLA_OPERSTATE, state);
565		} else if (matches(*argv, "numtxqueues") == 0) {
566			NEXT_ARG();
567			if (numtxqueues != -1)
568				duparg("numtxqueues", *argv);
569			if (get_integer(&numtxqueues, *argv, 0))
570				invarg("Invalid \"numtxqueues\" value\n", *argv);
571			addattr_l(&req->n, sizeof(*req), IFLA_NUM_TX_QUEUES,
572				  &numtxqueues, 4);
573		} else if (matches(*argv, "numrxqueues") == 0) {
574			NEXT_ARG();
575			if (numrxqueues != -1)
576				duparg("numrxqueues", *argv);
577			if (get_integer(&numrxqueues, *argv, 0))
578				invarg("Invalid \"numrxqueues\" value\n", *argv);
579			addattr_l(&req->n, sizeof(*req), IFLA_NUM_RX_QUEUES,
580				  &numrxqueues, 4);
581		} else if (matches(*argv, "addrgenmode") == 0) {
582			struct rtattr *afs, *afs6;
583			int mode;
584			NEXT_ARG();
585			mode = get_addr_gen_mode(*argv);
586			if (mode < 0)
587				invarg("Invalid address generation mode\n", *argv);
588			afs = addattr_nest(&req->n, sizeof(*req), IFLA_AF_SPEC);
589			afs6 = addattr_nest(&req->n, sizeof(*req), AF_INET6);
590			addattr8(&req->n, sizeof(*req), IFLA_INET6_ADDR_GEN_MODE, mode);
591			addattr_nest_end(&req->n, afs6);
592			addattr_nest_end(&req->n, afs);
593		} else if (matches(*argv, "link-netnsid") == 0) {
594			NEXT_ARG();
595			if (link_netnsid != -1)
596				duparg("link-netnsid", *argv);
597			if (get_integer(&link_netnsid, *argv, 0))
598				invarg("Invalid \"link-netnsid\" value\n", *argv);
599			addattr32(&req->n, sizeof(*req), IFLA_LINK_NETNSID,
600				  link_netnsid);
601		} else {
602			if (strcmp(*argv, "dev") == 0) {
603				NEXT_ARG();
604			}
605			if (matches(*argv, "help") == 0)
606				usage();
607			if (*dev)
608				duparg2("dev", *argv);
609			*dev = *argv;
610			dev_index = ll_name_to_index(*dev);
611		}
612		argc--; argv++;
613	}
614
615	return ret - argc;
616}
617
618static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
619{
620	int len;
621	char *dev = NULL;
622	char *name = NULL;
623	char *link = NULL;
624	char *type = NULL;
625	int index = -1;
626	int group;
627	struct link_util *lu = NULL;
628	struct iplink_req req;
629	int ret;
630
631	memset(&req, 0, sizeof(req));
632
633	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
634	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
635	req.n.nlmsg_type = cmd;
636	req.i.ifi_family = preferred_family;
637
638	ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group, &index);
639	if (ret < 0)
640		return ret;
641
642	argc -= ret;
643	argv += ret;
644
645	if (group != -1) {
646		if (dev)
647			addattr_l(&req.n, sizeof(req), IFLA_GROUP,
648					&group, sizeof(group));
649		else {
650			if (argc) {
651				fprintf(stderr, "Garbage instead of arguments "
652						"\"%s ...\". Try \"ip link "
653						"help\".\n", *argv);
654				return -1;
655			}
656			if (flags & NLM_F_CREATE) {
657				fprintf(stderr, "group cannot be used when "
658						"creating devices.\n");
659				return -1;
660			}
661
662			req.i.ifi_index = 0;
663			addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
664			if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
665				exit(2);
666			return 0;
667		}
668	}
669
670	if (!(flags & NLM_F_CREATE)) {
671		if (!dev) {
672			fprintf(stderr, "Not enough information: \"dev\" "
673					"argument is required.\n");
674			exit(-1);
675		}
676		if (cmd == RTM_NEWLINK && index != -1) {
677			fprintf(stderr, "index can be used only when "
678					"creating devices.\n");
679			exit(-1);
680		}
681
682		req.i.ifi_index = ll_name_to_index(dev);
683		if (req.i.ifi_index == 0) {
684			fprintf(stderr, "Cannot find device \"%s\"\n", dev);
685			return -1;
686		}
687	} else {
688		/* Allow "ip link add dev" and "ip link add name" */
689		if (!name)
690			name = dev;
691
692		if (link) {
693			int ifindex;
694
695			ifindex = ll_name_to_index(link);
696			if (ifindex == 0) {
697				fprintf(stderr, "Cannot find device \"%s\"\n",
698					link);
699				return -1;
700			}
701			addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
702		}
703
704		if (index == -1)
705			req.i.ifi_index = 0;
706		else
707			req.i.ifi_index = index;
708	}
709
710	if (name) {
711		len = strlen(name) + 1;
712		if (len == 1)
713			invarg("\"\" is not a valid device identifier\n", "name");
714		if (len > IFNAMSIZ)
715			invarg("\"name\" too long\n", name);
716		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
717	}
718
719	if (type) {
720		struct rtattr *linkinfo;
721		char slavebuf[128], *ulinep = strchr(type, '_');
722		int iflatype;
723
724		linkinfo = addattr_nest(&req.n, sizeof(req), IFLA_LINKINFO);
725		addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
726			 strlen(type));
727
728		if (ulinep && !strcmp(ulinep, "_slave")) {
729			strncpy(slavebuf, type, sizeof(slavebuf));
730			slavebuf[sizeof(slavebuf) - 1] = '\0';
731			ulinep = strchr(slavebuf, '_');
732			/* check in case it was after sizeof(slavebuf) - 1*/
733			if (ulinep)
734				*ulinep = '\0';
735			lu = get_link_slave_kind(slavebuf);
736			iflatype = IFLA_INFO_SLAVE_DATA;
737		} else {
738			lu = get_link_kind(type);
739			iflatype = IFLA_INFO_DATA;
740		}
741		if (lu && argc) {
742			struct rtattr *data = addattr_nest(&req.n, sizeof(req), iflatype);
743
744			if (lu->parse_opt &&
745			    lu->parse_opt(lu, argc, argv, &req.n))
746				return -1;
747
748			addattr_nest_end(&req.n, data);
749		} else if (argc) {
750			if (matches(*argv, "help") == 0)
751				usage();
752			fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
753					"Try \"ip link help\".\n", *argv);
754			return -1;
755		}
756		addattr_nest_end(&req.n, linkinfo);
757	} else if (flags & NLM_F_CREATE) {
758		fprintf(stderr, "Not enough information: \"type\" argument "
759				"is required\n");
760		return -1;
761	}
762
763	if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
764		exit(2);
765
766	return 0;
767}
768
769int iplink_get(unsigned int flags, char *name, __u32 filt_mask)
770{
771	int len;
772	struct iplink_req req;
773	char answer[16384];
774
775	memset(&req, 0, sizeof(req));
776
777	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
778	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
779	req.n.nlmsg_type = RTM_GETLINK;
780	req.i.ifi_family = preferred_family;
781
782	if (name) {
783		len = strlen(name) + 1;
784		if (len == 1)
785			invarg("\"\" is not a valid device identifier\n",
786				   "name");
787		if (len > IFNAMSIZ)
788			invarg("\"name\" too long\n", name);
789		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
790	}
791	addattr32(&req.n, sizeof(req), IFLA_EXT_MASK, filt_mask);
792
793	if (rtnl_talk(&rth, &req.n, 0, 0, (struct nlmsghdr *)answer) < 0)
794		return -2;
795
796	print_linkinfo(NULL, (struct nlmsghdr *)answer, stdout);
797
798	return 0;
799}
800
801#if IPLINK_IOCTL_COMPAT
802static int get_ctl_fd(void)
803{
804	int s_errno;
805	int fd;
806
807	fd = socket(PF_INET, SOCK_DGRAM, 0);
808	if (fd >= 0)
809		return fd;
810	s_errno = errno;
811	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
812	if (fd >= 0)
813		return fd;
814	fd = socket(PF_INET6, SOCK_DGRAM, 0);
815	if (fd >= 0)
816		return fd;
817	errno = s_errno;
818	perror("Cannot create control socket");
819	return -1;
820}
821
822static int do_chflags(const char *dev, __u32 flags, __u32 mask)
823{
824	struct ifreq ifr;
825	int fd;
826	int err;
827
828	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
829	fd = get_ctl_fd();
830	if (fd < 0)
831		return -1;
832	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
833	if (err) {
834		perror("SIOCGIFFLAGS");
835		close(fd);
836		return -1;
837	}
838	if ((ifr.ifr_flags^flags)&mask) {
839		ifr.ifr_flags &= ~mask;
840		ifr.ifr_flags |= mask&flags;
841		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
842		if (err)
843			perror("SIOCSIFFLAGS");
844	}
845	close(fd);
846	return err;
847}
848
849static int do_changename(const char *dev, const char *newdev)
850{
851	struct ifreq ifr;
852	int fd;
853	int err;
854
855	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
856	strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
857	fd = get_ctl_fd();
858	if (fd < 0)
859		return -1;
860	err = ioctl(fd, SIOCSIFNAME, &ifr);
861	if (err) {
862		perror("SIOCSIFNAME");
863		close(fd);
864		return -1;
865	}
866	close(fd);
867	return err;
868}
869
870static int set_qlen(const char *dev, int qlen)
871{
872	struct ifreq ifr;
873	int s;
874
875	s = get_ctl_fd();
876	if (s < 0)
877		return -1;
878
879	memset(&ifr, 0, sizeof(ifr));
880	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
881	ifr.ifr_qlen = qlen;
882	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
883		perror("SIOCSIFXQLEN");
884		close(s);
885		return -1;
886	}
887	close(s);
888
889	return 0;
890}
891
892static int set_mtu(const char *dev, int mtu)
893{
894	struct ifreq ifr;
895	int s;
896
897	s = get_ctl_fd();
898	if (s < 0)
899		return -1;
900
901	memset(&ifr, 0, sizeof(ifr));
902	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
903	ifr.ifr_mtu = mtu;
904	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
905		perror("SIOCSIFMTU");
906		close(s);
907		return -1;
908	}
909	close(s);
910
911	return 0;
912}
913
914static int get_address(const char *dev, int *htype)
915{
916	struct ifreq ifr;
917	struct sockaddr_ll me;
918	socklen_t alen;
919	int s;
920
921	s = socket(PF_PACKET, SOCK_DGRAM, 0);
922	if (s < 0) {
923		perror("socket(PF_PACKET)");
924		return -1;
925	}
926
927	memset(&ifr, 0, sizeof(ifr));
928	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
929	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
930		perror("SIOCGIFINDEX");
931		close(s);
932		return -1;
933	}
934
935	memset(&me, 0, sizeof(me));
936	me.sll_family = AF_PACKET;
937	me.sll_ifindex = ifr.ifr_ifindex;
938	me.sll_protocol = htons(ETH_P_LOOP);
939	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
940		perror("bind");
941		close(s);
942		return -1;
943	}
944
945	alen = sizeof(me);
946	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
947		perror("getsockname");
948		close(s);
949		return -1;
950	}
951	close(s);
952	*htype = me.sll_hatype;
953	return me.sll_halen;
954}
955
956static int parse_address(const char *dev, int hatype, int halen,
957		char *lla, struct ifreq *ifr)
958{
959	int alen;
960
961	memset(ifr, 0, sizeof(*ifr));
962	strncpy(ifr->ifr_name, dev, IFNAMSIZ);
963	ifr->ifr_hwaddr.sa_family = hatype;
964	alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
965	if (alen < 0)
966		return -1;
967	if (alen != halen) {
968		fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
969		return -1;
970	}
971	return 0;
972}
973
974static int set_address(struct ifreq *ifr, int brd)
975{
976	int s;
977
978	s = get_ctl_fd();
979	if (s < 0)
980		return -1;
981	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
982		perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
983		close(s);
984		return -1;
985	}
986	close(s);
987	return 0;
988}
989
990static int do_set(int argc, char **argv)
991{
992	char *dev = NULL;
993	__u32 mask = 0;
994	__u32 flags = 0;
995	int qlen = -1;
996	int mtu = -1;
997	char *newaddr = NULL;
998	char *newbrd = NULL;
999	struct ifreq ifr0, ifr1;
1000	char *newname = NULL;
1001	int htype, halen;
1002
1003	while (argc > 0) {
1004		if (strcmp(*argv, "up") == 0) {
1005			mask |= IFF_UP;
1006			flags |= IFF_UP;
1007		} else if (strcmp(*argv, "down") == 0) {
1008			mask |= IFF_UP;
1009			flags &= ~IFF_UP;
1010		} else if (strcmp(*argv, "name") == 0) {
1011			NEXT_ARG();
1012			newname = *argv;
1013		} else if (matches(*argv, "address") == 0) {
1014			NEXT_ARG();
1015			newaddr = *argv;
1016		} else if (matches(*argv, "broadcast") == 0 ||
1017			   strcmp(*argv, "brd") == 0) {
1018			NEXT_ARG();
1019			newbrd = *argv;
1020		} else if (matches(*argv, "txqueuelen") == 0 ||
1021			   strcmp(*argv, "qlen") == 0 ||
1022			   matches(*argv, "txqlen") == 0) {
1023			NEXT_ARG();
1024			if (qlen != -1)
1025				duparg("txqueuelen", *argv);
1026			if (get_integer(&qlen,  *argv, 0))
1027				invarg("Invalid \"txqueuelen\" value\n", *argv);
1028		} else if (strcmp(*argv, "mtu") == 0) {
1029			NEXT_ARG();
1030			if (mtu != -1)
1031				duparg("mtu", *argv);
1032			if (get_integer(&mtu, *argv, 0))
1033				invarg("Invalid \"mtu\" value\n", *argv);
1034		} else if (strcmp(*argv, "multicast") == 0) {
1035			NEXT_ARG();
1036			mask |= IFF_MULTICAST;
1037			if (strcmp(*argv, "on") == 0) {
1038				flags |= IFF_MULTICAST;
1039			} else if (strcmp(*argv, "off") == 0) {
1040				flags &= ~IFF_MULTICAST;
1041			} else
1042				return on_off("multicast", *argv);
1043		} else if (strcmp(*argv, "allmulticast") == 0) {
1044			NEXT_ARG();
1045			mask |= IFF_ALLMULTI;
1046			if (strcmp(*argv, "on") == 0) {
1047				flags |= IFF_ALLMULTI;
1048			} else if (strcmp(*argv, "off") == 0) {
1049				flags &= ~IFF_ALLMULTI;
1050			} else
1051				return on_off("allmulticast", *argv);
1052		} else if (strcmp(*argv, "promisc") == 0) {
1053			NEXT_ARG();
1054			mask |= IFF_PROMISC;
1055			if (strcmp(*argv, "on") == 0) {
1056				flags |= IFF_PROMISC;
1057			} else if (strcmp(*argv, "off") == 0) {
1058				flags &= ~IFF_PROMISC;
1059			} else
1060				return on_off("promisc", *argv);
1061		} else if (strcmp(*argv, "trailers") == 0) {
1062			NEXT_ARG();
1063			mask |= IFF_NOTRAILERS;
1064			if (strcmp(*argv, "off") == 0) {
1065				flags |= IFF_NOTRAILERS;
1066			} else if (strcmp(*argv, "on") == 0) {
1067				flags &= ~IFF_NOTRAILERS;
1068			} else
1069				return on_off("trailers", *argv);
1070		} else if (strcmp(*argv, "arp") == 0) {
1071			NEXT_ARG();
1072			mask |= IFF_NOARP;
1073			if (strcmp(*argv, "on") == 0) {
1074				flags &= ~IFF_NOARP;
1075			} else if (strcmp(*argv, "off") == 0) {
1076				flags |= IFF_NOARP;
1077			} else
1078				return on_off("noarp", *argv);
1079		} else if (matches(*argv, "dynamic") == 0) {
1080			NEXT_ARG();
1081			mask |= IFF_DYNAMIC;
1082			if (strcmp(*argv, "on") == 0) {
1083				flags |= IFF_DYNAMIC;
1084			} else if (strcmp(*argv, "off") == 0) {
1085				flags &= ~IFF_DYNAMIC;
1086			} else
1087				return on_off("dynamic", *argv);
1088		} else {
1089			if (strcmp(*argv, "dev") == 0) {
1090				NEXT_ARG();
1091			}
1092			if (matches(*argv, "help") == 0)
1093				usage();
1094			if (dev)
1095				duparg2("dev", *argv);
1096			dev = *argv;
1097		}
1098		argc--; argv++;
1099	}
1100
1101	if (!dev) {
1102		fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
1103		exit(-1);
1104	}
1105
1106	if (newaddr || newbrd) {
1107		halen = get_address(dev, &htype);
1108		if (halen < 0)
1109			return -1;
1110		if (newaddr) {
1111			if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
1112				return -1;
1113		}
1114		if (newbrd) {
1115			if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
1116				return -1;
1117		}
1118	}
1119
1120	if (newname && strcmp(dev, newname)) {
1121		if (strlen(newname) == 0)
1122			invarg("\"\" is not a valid device identifier\n", "name");
1123		if (do_changename(dev, newname) < 0)
1124			return -1;
1125		dev = newname;
1126	}
1127	if (qlen != -1) {
1128		if (set_qlen(dev, qlen) < 0)
1129			return -1;
1130	}
1131	if (mtu != -1) {
1132		if (set_mtu(dev, mtu) < 0)
1133			return -1;
1134	}
1135	if (newaddr || newbrd) {
1136		if (newbrd) {
1137			if (set_address(&ifr1, 1) < 0)
1138				return -1;
1139		}
1140		if (newaddr) {
1141			if (set_address(&ifr0, 0) < 0)
1142				return -1;
1143		}
1144	}
1145	if (mask)
1146		return do_chflags(dev, flags, mask);
1147	return 0;
1148}
1149#endif /* IPLINK_IOCTL_COMPAT */
1150
1151static void do_help(int argc, char **argv)
1152{
1153	struct link_util *lu = NULL;
1154
1155	if (argc <= 0) {
1156		usage();
1157		return ;
1158	}
1159
1160	lu = get_link_kind(*argv);
1161
1162	if (lu && lu->print_help)
1163		lu->print_help(lu, argc-1, argv+1, stdout);
1164	else
1165		usage();
1166}
1167
1168int do_iplink(int argc, char **argv)
1169{
1170	if (argc > 0) {
1171		if (iplink_have_newlink()) {
1172			if (matches(*argv, "add") == 0)
1173				return iplink_modify(RTM_NEWLINK,
1174						     NLM_F_CREATE|NLM_F_EXCL,
1175						     argc-1, argv+1);
1176			if (matches(*argv, "set") == 0 ||
1177			    matches(*argv, "change") == 0)
1178				return iplink_modify(RTM_NEWLINK, 0,
1179						     argc-1, argv+1);
1180			if (matches(*argv, "replace") == 0)
1181				return iplink_modify(RTM_NEWLINK,
1182						     NLM_F_CREATE|NLM_F_REPLACE,
1183						     argc-1, argv+1);
1184			if (matches(*argv, "delete") == 0)
1185				return iplink_modify(RTM_DELLINK, 0,
1186						     argc-1, argv+1);
1187		} else {
1188#if IPLINK_IOCTL_COMPAT
1189			if (matches(*argv, "set") == 0)
1190				return do_set(argc-1, argv+1);
1191#endif
1192		}
1193		if (matches(*argv, "show") == 0 ||
1194		    matches(*argv, "lst") == 0 ||
1195		    matches(*argv, "list") == 0)
1196			return ipaddr_list_link(argc-1, argv+1);
1197		if (matches(*argv, "help") == 0) {
1198			do_help(argc-1, argv+1);
1199			return 0;
1200		}
1201	} else
1202		return ipaddr_list_link(0, NULL);
1203
1204	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
1205	exit(-1);
1206}
1207