iplink.c revision e2613dc8605e56dbc53890ebbae263f93610bd41 
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
31#include "rt_names.h"
32#include "utils.h"
33#include "ip_common.h"
34
35#define IPLINK_IOCTL_COMPAT	1
36
37static void usage(void) __attribute__((noreturn));
38
39void iplink_usage(void)
40{
41	fprintf(stderr, "Usage: ip link set DEVICE { up | down |\n");
42	fprintf(stderr, "	                     arp { on | off } |\n");
43	fprintf(stderr, "	                     dynamic { on | off } |\n");
44	fprintf(stderr, "	                     multicast { on | off } |\n");
45	fprintf(stderr, "	                     allmulticast { on | off } |\n");
46	fprintf(stderr, "	                     promisc { on | off } |\n");
47	fprintf(stderr, "	                     trailers { on | off } |\n");
48	fprintf(stderr, "	                     txqueuelen PACKETS |\n");
49	fprintf(stderr, "	                     name NEWNAME |\n");
50	fprintf(stderr, "	                     address LLADDR | broadcast LLADDR |\n");
51	fprintf(stderr, "	                     mtu MTU }\n");
52	fprintf(stderr, "	                     netns PID }\n");
53	fprintf(stderr, "       ip link show [ DEVICE ]\n");
54	exit(-1);
55}
56
57static void usage(void)
58{
59	iplink_usage();
60}
61
62static int on_off(char *msg)
63{
64	fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
65	return -1;
66}
67
68static void *BODY;		/* cached dlopen(NULL) handle */
69static struct link_util *linkutil_list;
70
71struct link_util *get_link_kind(const char *id)
72{
73	void *dlh;
74	char buf[256];
75	struct link_util *l;
76
77	for (l = linkutil_list; l; l = l->next)
78		if (strcmp(l->id, id) == 0)
79			return l;
80
81	snprintf(buf, sizeof(buf), "/usr/lib/ip/link_%s.so", id);
82	dlh = dlopen(buf, RTLD_LAZY);
83	if (dlh == NULL) {
84		/* look in current binary, only open once */
85		dlh = BODY;
86		if (dlh == NULL) {
87			dlh = BODY = dlopen(NULL, RTLD_LAZY);
88			if (dlh == NULL)
89				return NULL;
90		}
91	}
92
93	snprintf(buf, sizeof(buf), "%s_link_util", id);
94	l = dlsym(dlh, buf);
95	if (l == NULL)
96		return NULL;
97
98	l->next = linkutil_list;
99	linkutil_list = l;
100	return l;
101}
102
103#if IPLINK_IOCTL_COMPAT
104static int have_rtnl_newlink = -1;
105
106static int accept_msg(const struct sockaddr_nl *who,
107		      struct nlmsghdr *n, void *arg)
108{
109	struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
110
111	if (n->nlmsg_type == NLMSG_ERROR &&
112	    (err->error == -EOPNOTSUPP || err->error == -EINVAL))
113		have_rtnl_newlink = 0;
114	else
115		have_rtnl_newlink = 1;
116	return -1;
117}
118
119static int iplink_have_newlink(void)
120{
121	struct {
122		struct nlmsghdr		n;
123		struct ifinfomsg	i;
124		char			buf[1024];
125	} req;
126
127	if (have_rtnl_newlink < 0) {
128		memset(&req, 0, sizeof(req));
129
130		req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
131		req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
132		req.n.nlmsg_type = RTM_NEWLINK;
133		req.i.ifi_family = AF_UNSPEC;
134
135		rtnl_send(&rth, (char *)&req.n, req.n.nlmsg_len);
136		rtnl_listen(&rth, accept_msg, NULL);
137	}
138	return have_rtnl_newlink;
139}
140#else /* IPLINK_IOCTL_COMPAT */
141static int iplink_have_newlink(void)
142{
143	return 1;
144}
145#endif /* ! IPLINK_IOCTL_COMPAT */
146
147struct iplink_req {
148	struct nlmsghdr		n;
149	struct ifinfomsg	i;
150	char			buf[1024];
151};
152
153int iplink_parse(int argc, char **argv, struct iplink_req *req,
154		char **name, char **type, char **link, char **dev)
155{
156	int ret, len;
157	char abuf[32];
158	int qlen = -1;
159	int mtu = -1;
160	int netns = -1;
161
162	ret = argc;
163
164	while (argc > 0) {
165		if (strcmp(*argv, "up") == 0) {
166			req->i.ifi_change |= IFF_UP;
167			req->i.ifi_flags |= IFF_UP;
168		} else if (strcmp(*argv, "down") == 0) {
169			req->i.ifi_change |= IFF_UP;
170			req->i.ifi_flags &= ~IFF_UP;
171		} else if (strcmp(*argv, "name") == 0) {
172			NEXT_ARG();
173			*name = *argv;
174		} else if (matches(*argv, "link") == 0) {
175			NEXT_ARG();
176			*link = *argv;
177		} else if (matches(*argv, "address") == 0) {
178			NEXT_ARG();
179			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
180			addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
181		} else if (matches(*argv, "broadcast") == 0 ||
182				strcmp(*argv, "brd") == 0) {
183			NEXT_ARG();
184			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
185			addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
186		} else if (matches(*argv, "txqueuelen") == 0 ||
187				strcmp(*argv, "qlen") == 0 ||
188				matches(*argv, "txqlen") == 0) {
189			NEXT_ARG();
190			if (qlen != -1)
191				duparg("txqueuelen", *argv);
192			if (get_integer(&qlen,  *argv, 0))
193				invarg("Invalid \"txqueuelen\" value\n", *argv);
194			addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
195		} else if (strcmp(*argv, "mtu") == 0) {
196			NEXT_ARG();
197			if (mtu != -1)
198				duparg("mtu", *argv);
199			if (get_integer(&mtu, *argv, 0))
200				invarg("Invalid \"mtu\" value\n", *argv);
201			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
202                } else if (strcmp(*argv, "netns") == 0) {
203                        NEXT_ARG();
204                        if (netns != -1)
205                                duparg("netns", *argv);
206                        if (get_integer(&netns, *argv, 0))
207                                invarg("Invalid \"netns\" value\n", *argv);
208                        addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
209		} else if (strcmp(*argv, "multicast") == 0) {
210			NEXT_ARG();
211			req->i.ifi_change |= IFF_MULTICAST;
212			if (strcmp(*argv, "on") == 0) {
213				req->i.ifi_flags |= IFF_MULTICAST;
214			} else if (strcmp(*argv, "off") == 0) {
215				req->i.ifi_flags &= ~IFF_MULTICAST;
216			} else
217				return on_off("multicast");
218		} else if (strcmp(*argv, "allmulticast") == 0) {
219			NEXT_ARG();
220			req->i.ifi_change |= IFF_ALLMULTI;
221			if (strcmp(*argv, "on") == 0) {
222				req->i.ifi_flags |= IFF_ALLMULTI;
223			} else if (strcmp(*argv, "off") == 0) {
224				req->i.ifi_flags &= ~IFF_ALLMULTI;
225			} else
226				return on_off("allmulticast");
227		} else if (strcmp(*argv, "promisc") == 0) {
228			NEXT_ARG();
229			req->i.ifi_change |= IFF_PROMISC;
230			if (strcmp(*argv, "on") == 0) {
231				req->i.ifi_flags |= IFF_PROMISC;
232			} else if (strcmp(*argv, "off") == 0) {
233				req->i.ifi_flags &= ~IFF_PROMISC;
234			} else
235				return on_off("promisc");
236		} else if (strcmp(*argv, "trailers") == 0) {
237			NEXT_ARG();
238			req->i.ifi_change |= IFF_NOTRAILERS;
239			if (strcmp(*argv, "off") == 0) {
240				req->i.ifi_flags |= IFF_NOTRAILERS;
241			} else if (strcmp(*argv, "on") == 0) {
242				req->i.ifi_flags &= ~IFF_NOTRAILERS;
243			} else
244				return on_off("trailers");
245		} else if (strcmp(*argv, "arp") == 0) {
246			NEXT_ARG();
247			req->i.ifi_change |= IFF_NOARP;
248			if (strcmp(*argv, "on") == 0) {
249				req->i.ifi_flags &= ~IFF_NOARP;
250			} else if (strcmp(*argv, "off") == 0) {
251				req->i.ifi_flags |= IFF_NOARP;
252			} else
253				return on_off("noarp");
254#ifdef IFF_DYNAMIC
255		} else if (matches(*argv, "dynamic") == 0) {
256			NEXT_ARG();
257			req->i.ifi_change |= IFF_DYNAMIC;
258			if (strcmp(*argv, "on") == 0) {
259				req->i.ifi_flags |= IFF_DYNAMIC;
260			} else if (strcmp(*argv, "off") == 0) {
261				req->i.ifi_flags &= ~IFF_DYNAMIC;
262			} else
263				return on_off("dynamic");
264#endif
265		} else if (matches(*argv, "type") == 0) {
266			NEXT_ARG();
267			*type = *argv;
268			argc--; argv++;
269			break;
270		} else {
271			if (strcmp(*argv, "dev") == 0) {
272				NEXT_ARG();
273			}
274			if (*dev)
275				duparg2("dev", *argv);
276			*dev = *argv;
277		}
278		argc--; argv++;
279	}
280
281	return ret - argc;
282}
283
284static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
285{
286	int len;
287	char *dev = NULL;
288	char *name = NULL;
289	char *link = NULL;
290	char *type = NULL;
291	struct link_util *lu = NULL;
292	struct iplink_req req;
293	int ret;
294
295	memset(&req, 0, sizeof(req));
296
297	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
298	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
299	req.n.nlmsg_type = cmd;
300	req.i.ifi_family = preferred_family;
301
302	ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev);
303	if (ret < 0)
304		return ret;
305
306	argc -= ret;
307	argv += ret;
308	ll_init_map(&rth);
309
310	if (type) {
311		struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
312		addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
313		addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
314			 strlen(type));
315
316		lu = get_link_kind(type);
317		if (lu && argc) {
318			struct rtattr * data = NLMSG_TAIL(&req.n);
319			addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
320
321			if (lu->parse_opt &&
322			    lu->parse_opt(lu, argc, argv, &req.n))
323				return -1;
324
325			data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
326		} else if (argc) {
327			if (matches(*argv, "help") == 0)
328				usage();
329			fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
330					"Try \"ip link help\".\n", *argv);
331			return -1;
332		}
333		linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
334	}
335
336	if (!(flags & NLM_F_CREATE)) {
337		if (!dev) {
338			fprintf(stderr, "Not enough information: \"dev\" "
339					"argument is required.\n");
340			exit(-1);
341		}
342
343		req.i.ifi_index = ll_name_to_index(dev);
344		if (req.i.ifi_index == 0) {
345			fprintf(stderr, "Cannot find device \"%s\"\n", dev);
346			return -1;
347		}
348	} else {
349		/* Allow "ip link add dev" and "ip link add name" */
350		if (!name)
351			name = dev;
352
353		if (link) {
354			int ifindex;
355
356			ifindex = ll_name_to_index(link);
357			if (ifindex == 0) {
358				fprintf(stderr, "Cannot find device \"%s\"\n",
359					link);
360				return -1;
361			}
362			addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
363		}
364	}
365
366	if (name) {
367		len = strlen(name) + 1;
368		if (len == 1)
369			invarg("\"\" is not a valid device identifier\n", "name");
370		if (len > IFNAMSIZ)
371			invarg("\"name\" too long\n", name);
372		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
373	}
374
375	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
376		exit(2);
377
378	return 0;
379}
380
381#if IPLINK_IOCTL_COMPAT
382static int get_ctl_fd(void)
383{
384	int s_errno;
385	int fd;
386
387	fd = socket(PF_INET, SOCK_DGRAM, 0);
388	if (fd >= 0)
389		return fd;
390	s_errno = errno;
391	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
392	if (fd >= 0)
393		return fd;
394	fd = socket(PF_INET6, SOCK_DGRAM, 0);
395	if (fd >= 0)
396		return fd;
397	errno = s_errno;
398	perror("Cannot create control socket");
399	return -1;
400}
401
402static int do_chflags(const char *dev, __u32 flags, __u32 mask)
403{
404	struct ifreq ifr;
405	int fd;
406	int err;
407
408	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
409	fd = get_ctl_fd();
410	if (fd < 0)
411		return -1;
412	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
413	if (err) {
414		perror("SIOCGIFFLAGS");
415		close(fd);
416		return -1;
417	}
418	if ((ifr.ifr_flags^flags)&mask) {
419		ifr.ifr_flags &= ~mask;
420		ifr.ifr_flags |= mask&flags;
421		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
422		if (err)
423			perror("SIOCSIFFLAGS");
424	}
425	close(fd);
426	return err;
427}
428
429static int do_changename(const char *dev, const char *newdev)
430{
431	struct ifreq ifr;
432	int fd;
433	int err;
434
435	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
436	strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
437	fd = get_ctl_fd();
438	if (fd < 0)
439		return -1;
440	err = ioctl(fd, SIOCSIFNAME, &ifr);
441	if (err) {
442		perror("SIOCSIFNAME");
443		close(fd);
444		return -1;
445	}
446	close(fd);
447	return err;
448}
449
450static int set_qlen(const char *dev, int qlen)
451{
452	struct ifreq ifr;
453	int s;
454
455	s = get_ctl_fd();
456	if (s < 0)
457		return -1;
458
459	memset(&ifr, 0, sizeof(ifr));
460	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
461	ifr.ifr_qlen = qlen;
462	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
463		perror("SIOCSIFXQLEN");
464		close(s);
465		return -1;
466	}
467	close(s);
468
469	return 0;
470}
471
472static int set_mtu(const char *dev, int mtu)
473{
474	struct ifreq ifr;
475	int s;
476
477	s = get_ctl_fd();
478	if (s < 0)
479		return -1;
480
481	memset(&ifr, 0, sizeof(ifr));
482	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
483	ifr.ifr_mtu = mtu;
484	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
485		perror("SIOCSIFMTU");
486		close(s);
487		return -1;
488	}
489	close(s);
490
491	return 0;
492}
493
494static int get_address(const char *dev, int *htype)
495{
496	struct ifreq ifr;
497	struct sockaddr_ll me;
498	socklen_t alen;
499	int s;
500
501	s = socket(PF_PACKET, SOCK_DGRAM, 0);
502	if (s < 0) {
503		perror("socket(PF_PACKET)");
504		return -1;
505	}
506
507	memset(&ifr, 0, sizeof(ifr));
508	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
509	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
510		perror("SIOCGIFINDEX");
511		close(s);
512		return -1;
513	}
514
515	memset(&me, 0, sizeof(me));
516	me.sll_family = AF_PACKET;
517	me.sll_ifindex = ifr.ifr_ifindex;
518	me.sll_protocol = htons(ETH_P_LOOP);
519	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
520		perror("bind");
521		close(s);
522		return -1;
523	}
524
525	alen = sizeof(me);
526	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
527		perror("getsockname");
528		close(s);
529		return -1;
530	}
531	close(s);
532	*htype = me.sll_hatype;
533	return me.sll_halen;
534}
535
536static int parse_address(const char *dev, int hatype, int halen,
537		char *lla, struct ifreq *ifr)
538{
539	int alen;
540
541	memset(ifr, 0, sizeof(*ifr));
542	strncpy(ifr->ifr_name, dev, IFNAMSIZ);
543	ifr->ifr_hwaddr.sa_family = hatype;
544	alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
545	if (alen < 0)
546		return -1;
547	if (alen != halen) {
548		fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
549		return -1;
550	}
551	return 0;
552}
553
554static int set_address(struct ifreq *ifr, int brd)
555{
556	int s;
557
558	s = get_ctl_fd();
559	if (s < 0)
560		return -1;
561	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
562		perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
563		close(s);
564		return -1;
565	}
566	close(s);
567	return 0;
568}
569
570
571static int do_set(int argc, char **argv)
572{
573	char *dev = NULL;
574	__u32 mask = 0;
575	__u32 flags = 0;
576	int qlen = -1;
577	int mtu = -1;
578	char *newaddr = NULL;
579	char *newbrd = NULL;
580	struct ifreq ifr0, ifr1;
581	char *newname = NULL;
582	int htype, halen;
583
584	while (argc > 0) {
585		if (strcmp(*argv, "up") == 0) {
586			mask |= IFF_UP;
587			flags |= IFF_UP;
588		} else if (strcmp(*argv, "down") == 0) {
589			mask |= IFF_UP;
590			flags &= ~IFF_UP;
591		} else if (strcmp(*argv, "name") == 0) {
592			NEXT_ARG();
593			newname = *argv;
594		} else if (matches(*argv, "address") == 0) {
595			NEXT_ARG();
596			newaddr = *argv;
597		} else if (matches(*argv, "broadcast") == 0 ||
598			   strcmp(*argv, "brd") == 0) {
599			NEXT_ARG();
600			newbrd = *argv;
601		} else if (matches(*argv, "txqueuelen") == 0 ||
602			   strcmp(*argv, "qlen") == 0 ||
603			   matches(*argv, "txqlen") == 0) {
604			NEXT_ARG();
605			if (qlen != -1)
606				duparg("txqueuelen", *argv);
607			if (get_integer(&qlen,  *argv, 0))
608				invarg("Invalid \"txqueuelen\" value\n", *argv);
609		} else if (strcmp(*argv, "mtu") == 0) {
610			NEXT_ARG();
611			if (mtu != -1)
612				duparg("mtu", *argv);
613			if (get_integer(&mtu, *argv, 0))
614				invarg("Invalid \"mtu\" value\n", *argv);
615		} else if (strcmp(*argv, "multicast") == 0) {
616			NEXT_ARG();
617			mask |= IFF_MULTICAST;
618			if (strcmp(*argv, "on") == 0) {
619				flags |= IFF_MULTICAST;
620			} else if (strcmp(*argv, "off") == 0) {
621				flags &= ~IFF_MULTICAST;
622			} else
623				return on_off("multicast");
624		} else if (strcmp(*argv, "allmulticast") == 0) {
625			NEXT_ARG();
626			mask |= IFF_ALLMULTI;
627			if (strcmp(*argv, "on") == 0) {
628				flags |= IFF_ALLMULTI;
629			} else if (strcmp(*argv, "off") == 0) {
630				flags &= ~IFF_ALLMULTI;
631			} else
632				return on_off("allmulticast");
633		} else if (strcmp(*argv, "promisc") == 0) {
634			NEXT_ARG();
635			mask |= IFF_PROMISC;
636			if (strcmp(*argv, "on") == 0) {
637				flags |= IFF_PROMISC;
638			} else if (strcmp(*argv, "off") == 0) {
639				flags &= ~IFF_PROMISC;
640			} else
641				return on_off("promisc");
642		} else if (strcmp(*argv, "trailers") == 0) {
643			NEXT_ARG();
644			mask |= IFF_NOTRAILERS;
645			if (strcmp(*argv, "off") == 0) {
646				flags |= IFF_NOTRAILERS;
647			} else if (strcmp(*argv, "on") == 0) {
648				flags &= ~IFF_NOTRAILERS;
649			} else
650				return on_off("trailers");
651		} else if (strcmp(*argv, "arp") == 0) {
652			NEXT_ARG();
653			mask |= IFF_NOARP;
654			if (strcmp(*argv, "on") == 0) {
655				flags &= ~IFF_NOARP;
656			} else if (strcmp(*argv, "off") == 0) {
657				flags |= IFF_NOARP;
658			} else
659				return on_off("noarp");
660#ifdef IFF_DYNAMIC
661		} else if (matches(*argv, "dynamic") == 0) {
662			NEXT_ARG();
663			mask |= IFF_DYNAMIC;
664			if (strcmp(*argv, "on") == 0) {
665				flags |= IFF_DYNAMIC;
666			} else if (strcmp(*argv, "off") == 0) {
667				flags &= ~IFF_DYNAMIC;
668			} else
669				return on_off("dynamic");
670#endif
671		} else {
672                        if (strcmp(*argv, "dev") == 0) {
673				NEXT_ARG();
674			}
675			if (matches(*argv, "help") == 0)
676				usage();
677			if (dev)
678				duparg2("dev", *argv);
679			dev = *argv;
680		}
681		argc--; argv++;
682	}
683
684	if (!dev) {
685		fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
686		exit(-1);
687	}
688
689	if (newaddr || newbrd) {
690		halen = get_address(dev, &htype);
691		if (halen < 0)
692			return -1;
693		if (newaddr) {
694			if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
695				return -1;
696		}
697		if (newbrd) {
698			if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
699				return -1;
700		}
701	}
702
703	if (newname && strcmp(dev, newname)) {
704		if (strlen(newname) == 0)
705			invarg("\"\" is not a valid device identifier\n", "name");
706		if (do_changename(dev, newname) < 0)
707			return -1;
708		dev = newname;
709	}
710	if (qlen != -1) {
711		if (set_qlen(dev, qlen) < 0)
712			return -1;
713	}
714	if (mtu != -1) {
715		if (set_mtu(dev, mtu) < 0)
716			return -1;
717	}
718	if (newaddr || newbrd) {
719		if (newbrd) {
720			if (set_address(&ifr1, 1) < 0)
721				return -1;
722		}
723		if (newaddr) {
724			if (set_address(&ifr0, 0) < 0)
725				return -1;
726		}
727	}
728	if (mask)
729		return do_chflags(dev, flags, mask);
730	return 0;
731}
732#endif /* IPLINK_IOCTL_COMPAT */
733
734int do_iplink(int argc, char **argv)
735{
736	if (argc > 0) {
737		if (iplink_have_newlink()) {
738			if (matches(*argv, "add") == 0)
739				return iplink_modify(RTM_NEWLINK,
740						     NLM_F_CREATE|NLM_F_EXCL,
741						     argc-1, argv+1);
742			if (matches(*argv, "set") == 0 ||
743			    matches(*argv, "change") == 0)
744				return iplink_modify(RTM_NEWLINK, 0,
745						     argc-1, argv+1);
746			if (matches(*argv, "replace") == 0)
747				return iplink_modify(RTM_NEWLINK,
748						     NLM_F_CREATE|NLM_F_REPLACE,
749						     argc-1, argv+1);
750			if (matches(*argv, "delete") == 0)
751				return iplink_modify(RTM_DELLINK, 0,
752						     argc-1, argv+1);
753		} else {
754#if IPLINK_IOCTL_COMPAT
755			if (matches(*argv, "set") == 0)
756				return do_set(argc-1, argv+1);
757#endif
758		}
759		if (matches(*argv, "show") == 0 ||
760		    matches(*argv, "lst") == 0 ||
761		    matches(*argv, "list") == 0)
762			return ipaddr_list_link(argc-1, argv+1);
763		if (matches(*argv, "help") == 0)
764			usage();
765	} else
766		return ipaddr_list_link(0, NULL);
767
768	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
769	exit(-1);
770}
771