iplink.c revision ae7229d5f99ed9d7fd6ae11bcc726b80e8f8cb87 
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#ifndef LIBDIR
37#define LIBDIR "/usr/lib/"
38#endif
39
40static void usage(void) __attribute__((noreturn));
41static int iplink_have_newlink(void);
42
43void iplink_usage(void)
44{
45	if (iplink_have_newlink()) {
46		fprintf(stderr, "Usage: ip link add link DEV [ name ] NAME\n");
47		fprintf(stderr, "                   [ txqueuelen PACKETS ]\n");
48		fprintf(stderr, "                   [ address LLADDR ]\n");
49		fprintf(stderr, "                   [ broadcast LLADDR ]\n");
50		fprintf(stderr, "                   [ mtu MTU ]\n");
51		fprintf(stderr, "                   type TYPE [ ARGS ]\n");
52		fprintf(stderr, "       ip link delete DEV type TYPE [ ARGS ]\n");
53		fprintf(stderr, "\n");
54		fprintf(stderr, "       ip link set DEVICE [ { up | down } ]\n");
55	} else
56		fprintf(stderr, "Usage: ip link set DEVICE [ { up | down } ]\n");
57
58	fprintf(stderr, "	                  [ arp { on | off } ]\n");
59	fprintf(stderr, "	                  [ dynamic { on | off } ]\n");
60	fprintf(stderr, "	                  [ multicast { on | off } ]\n");
61	fprintf(stderr, "	                  [ allmulticast { on | off } ]\n");
62	fprintf(stderr, "	                  [ promisc { on | off } ]\n");
63	fprintf(stderr, "	                  [ trailers { on | off } ]\n");
64	fprintf(stderr, "	                  [ txqueuelen PACKETS ]\n");
65	fprintf(stderr, "	                  [ name NEWNAME ]\n");
66	fprintf(stderr, "	                  [ address LLADDR ]\n");
67	fprintf(stderr, "	                  [ broadcast LLADDR ]\n");
68	fprintf(stderr, "	                  [ mtu MTU ]\n");
69	fprintf(stderr, "	                  [ netns PID ]\n");
70	fprintf(stderr, "			  [ alias NAME ]\n");
71	fprintf(stderr, "	                  [ vf NUM [ mac LLADDR ]\n");
72	fprintf(stderr, "				   [ vlan VLANID [ qos VLAN-QOS ] ]\n");
73	fprintf(stderr, "				   [ rate TXRATE ] ] \n");
74	fprintf(stderr, "       ip link show [ DEVICE ]\n");
75
76	if (iplink_have_newlink()) {
77		fprintf(stderr, "\n");
78		fprintf(stderr, "TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | can }\n");
79	}
80	exit(-1);
81}
82
83static void usage(void)
84{
85	iplink_usage();
86}
87
88static int on_off(char *msg)
89{
90	fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
91	return -1;
92}
93
94static void *BODY;		/* cached dlopen(NULL) handle */
95static struct link_util *linkutil_list;
96
97struct link_util *get_link_kind(const char *id)
98{
99	void *dlh;
100	char buf[256];
101	struct link_util *l;
102
103	for (l = linkutil_list; l; l = l->next)
104		if (strcmp(l->id, id) == 0)
105			return l;
106
107	snprintf(buf, sizeof(buf), LIBDIR "/ip/link_%s.so", id);
108	dlh = dlopen(buf, RTLD_LAZY);
109	if (dlh == NULL) {
110		/* look in current binary, only open once */
111		dlh = BODY;
112		if (dlh == NULL) {
113			dlh = BODY = dlopen(NULL, RTLD_LAZY);
114			if (dlh == NULL)
115				return NULL;
116		}
117	}
118
119	snprintf(buf, sizeof(buf), "%s_link_util", id);
120	l = dlsym(dlh, buf);
121	if (l == NULL)
122		return NULL;
123
124	l->next = linkutil_list;
125	linkutil_list = l;
126	return l;
127}
128
129#if IPLINK_IOCTL_COMPAT
130static int have_rtnl_newlink = -1;
131
132static int accept_msg(const struct sockaddr_nl *who,
133		      struct nlmsghdr *n, void *arg)
134{
135	struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
136
137	if (n->nlmsg_type == NLMSG_ERROR &&
138	    (err->error == -EOPNOTSUPP || err->error == -EINVAL))
139		have_rtnl_newlink = 0;
140	else
141		have_rtnl_newlink = 1;
142	return -1;
143}
144
145static int iplink_have_newlink(void)
146{
147	struct {
148		struct nlmsghdr		n;
149		struct ifinfomsg	i;
150		char			buf[1024];
151	} req;
152
153	if (have_rtnl_newlink < 0) {
154		memset(&req, 0, sizeof(req));
155
156		req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
157		req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
158		req.n.nlmsg_type = RTM_NEWLINK;
159		req.i.ifi_family = AF_UNSPEC;
160
161		rtnl_send(&rth, (char *)&req.n, req.n.nlmsg_len);
162		rtnl_listen(&rth, accept_msg, NULL);
163	}
164	return have_rtnl_newlink;
165}
166#else /* IPLINK_IOCTL_COMPAT */
167static int iplink_have_newlink(void)
168{
169	return 1;
170}
171#endif /* ! IPLINK_IOCTL_COMPAT */
172
173struct iplink_req {
174	struct nlmsghdr		n;
175	struct ifinfomsg	i;
176	char			buf[1024];
177};
178
179int iplink_parse(int argc, char **argv, struct iplink_req *req,
180		char **name, char **type, char **link, char **dev)
181{
182	int ret, len;
183	char abuf[32];
184	int qlen = -1;
185	int mtu = -1;
186	int netns = -1;
187	int vf = -1;
188
189	ret = argc;
190
191	while (argc > 0) {
192		if (strcmp(*argv, "up") == 0) {
193			req->i.ifi_change |= IFF_UP;
194			req->i.ifi_flags |= IFF_UP;
195		} else if (strcmp(*argv, "down") == 0) {
196			req->i.ifi_change |= IFF_UP;
197			req->i.ifi_flags &= ~IFF_UP;
198		} else if (strcmp(*argv, "name") == 0) {
199			NEXT_ARG();
200			*name = *argv;
201		} else if (matches(*argv, "link") == 0) {
202			NEXT_ARG();
203			*link = *argv;
204		} else if (matches(*argv, "address") == 0) {
205			NEXT_ARG();
206			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
207			if (len < 0)
208				return -1;
209			addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
210		} else if (matches(*argv, "broadcast") == 0 ||
211				strcmp(*argv, "brd") == 0) {
212			NEXT_ARG();
213			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
214			if (len < 0)
215				return -1;
216			addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
217		} else if (matches(*argv, "txqueuelen") == 0 ||
218				strcmp(*argv, "qlen") == 0 ||
219				matches(*argv, "txqlen") == 0) {
220			NEXT_ARG();
221			if (qlen != -1)
222				duparg("txqueuelen", *argv);
223			if (get_integer(&qlen,  *argv, 0))
224				invarg("Invalid \"txqueuelen\" value\n", *argv);
225			addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
226		} else if (strcmp(*argv, "mtu") == 0) {
227			NEXT_ARG();
228			if (mtu != -1)
229				duparg("mtu", *argv);
230			if (get_integer(&mtu, *argv, 0))
231				invarg("Invalid \"mtu\" value\n", *argv);
232			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
233                } else if (strcmp(*argv, "netns") == 0) {
234                        NEXT_ARG();
235                        if (netns != -1)
236                                duparg("netns", *argv);
237                        if (get_integer(&netns, *argv, 0))
238                                invarg("Invalid \"netns\" value\n", *argv);
239                        addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
240		} else if (strcmp(*argv, "multicast") == 0) {
241			NEXT_ARG();
242			req->i.ifi_change |= IFF_MULTICAST;
243			if (strcmp(*argv, "on") == 0) {
244				req->i.ifi_flags |= IFF_MULTICAST;
245			} else if (strcmp(*argv, "off") == 0) {
246				req->i.ifi_flags &= ~IFF_MULTICAST;
247			} else
248				return on_off("multicast");
249		} else if (strcmp(*argv, "allmulticast") == 0) {
250			NEXT_ARG();
251			req->i.ifi_change |= IFF_ALLMULTI;
252			if (strcmp(*argv, "on") == 0) {
253				req->i.ifi_flags |= IFF_ALLMULTI;
254			} else if (strcmp(*argv, "off") == 0) {
255				req->i.ifi_flags &= ~IFF_ALLMULTI;
256			} else
257				return on_off("allmulticast");
258		} else if (strcmp(*argv, "promisc") == 0) {
259			NEXT_ARG();
260			req->i.ifi_change |= IFF_PROMISC;
261			if (strcmp(*argv, "on") == 0) {
262				req->i.ifi_flags |= IFF_PROMISC;
263			} else if (strcmp(*argv, "off") == 0) {
264				req->i.ifi_flags &= ~IFF_PROMISC;
265			} else
266				return on_off("promisc");
267		} else if (strcmp(*argv, "trailers") == 0) {
268			NEXT_ARG();
269			req->i.ifi_change |= IFF_NOTRAILERS;
270			if (strcmp(*argv, "off") == 0) {
271				req->i.ifi_flags |= IFF_NOTRAILERS;
272			} else if (strcmp(*argv, "on") == 0) {
273				req->i.ifi_flags &= ~IFF_NOTRAILERS;
274			} else
275				return on_off("trailers");
276		} else if (strcmp(*argv, "arp") == 0) {
277			NEXT_ARG();
278			req->i.ifi_change |= IFF_NOARP;
279			if (strcmp(*argv, "on") == 0) {
280				req->i.ifi_flags &= ~IFF_NOARP;
281			} else if (strcmp(*argv, "off") == 0) {
282				req->i.ifi_flags |= IFF_NOARP;
283			} else
284				return on_off("noarp");
285		} else if (strcmp(*argv, "vf") == 0) {
286			NEXT_ARG();
287			if (get_integer(&vf,  *argv, 0)) {
288				invarg("Invalid \"vf\" value\n", *argv);
289			}
290		} else if (matches(*argv, "mac") == 0) {
291			struct ifla_vf_mac ivm;
292			NEXT_ARG();
293			if (vf < 0) {
294				missarg("vf");
295			}
296			ivm.vf = vf;
297			len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
298			if (len < 0)
299				return -1;
300			addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
301		} else if (matches(*argv, "vlan") == 0) {
302			struct ifla_vf_vlan ivv;
303			NEXT_ARG();
304			if (vf < 0) {
305				missarg("vf");
306			}
307			if (get_unsigned(&ivv.vlan, *argv, 0)) {
308				invarg("Invalid \"vlan\" value\n", *argv);
309			}
310			ivv.vf = vf;
311			ivv.qos = 0;
312			if (NEXT_ARG_OK()) {
313				NEXT_ARG();
314				if (matches(*argv, "qos") == 0) {
315					NEXT_ARG();
316					if (get_unsigned(&ivv.qos, *argv, 0)) {
317						invarg("Invalid \"qos\" value\n", *argv);
318					}
319				}
320			}
321			addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
322		} else if (matches(*argv, "rate") == 0) {
323			struct ifla_vf_tx_rate ivt;
324			NEXT_ARG();
325			if (vf < 0) {
326				missarg("vf");
327			}
328			if (get_unsigned(&ivt.rate, *argv, 0)) {
329				invarg("Invalid \"rate\" value\n", *argv);
330			}
331			ivt.vf = vf;
332			addattr_l(&req->n, sizeof(*req), IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
333#ifdef IFF_DYNAMIC
334		} else if (matches(*argv, "dynamic") == 0) {
335			NEXT_ARG();
336			req->i.ifi_change |= IFF_DYNAMIC;
337			if (strcmp(*argv, "on") == 0) {
338				req->i.ifi_flags |= IFF_DYNAMIC;
339			} else if (strcmp(*argv, "off") == 0) {
340				req->i.ifi_flags &= ~IFF_DYNAMIC;
341			} else
342				return on_off("dynamic");
343#endif
344		} else if (matches(*argv, "type") == 0) {
345			NEXT_ARG();
346			*type = *argv;
347			argc--; argv++;
348			break;
349		} else if (matches(*argv, "alias") == 0) {
350			NEXT_ARG();
351			addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
352				  *argv, strlen(*argv));
353			argc--; argv++;
354			break;
355		} else {
356			if (strcmp(*argv, "dev") == 0) {
357				NEXT_ARG();
358			}
359			if (matches(*argv, "help") == 0)
360				usage();
361			if (*dev)
362				duparg2("dev", *argv);
363			*dev = *argv;
364		}
365		argc--; argv++;
366	}
367
368	return ret - argc;
369}
370
371static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
372{
373	int len;
374	char *dev = NULL;
375	char *name = NULL;
376	char *link = NULL;
377	char *type = NULL;
378	struct link_util *lu = NULL;
379	struct iplink_req req;
380	int ret;
381
382	memset(&req, 0, sizeof(req));
383
384	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
385	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
386	req.n.nlmsg_type = cmd;
387	req.i.ifi_family = preferred_family;
388
389	ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev);
390	if (ret < 0)
391		return ret;
392
393	argc -= ret;
394	argv += ret;
395	ll_init_map(&rth);
396
397	if (type) {
398		struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
399		addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
400		addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
401			 strlen(type));
402
403		lu = get_link_kind(type);
404		if (lu && argc) {
405			struct rtattr * data = NLMSG_TAIL(&req.n);
406			addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
407
408			if (lu->parse_opt &&
409			    lu->parse_opt(lu, argc, argv, &req.n))
410				return -1;
411
412			data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
413		} else if (argc) {
414			if (matches(*argv, "help") == 0)
415				usage();
416			fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
417					"Try \"ip link help\".\n", *argv);
418			return -1;
419		}
420		linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
421	} else if (flags & NLM_F_CREATE) {
422		fprintf(stderr, "Not enough information: \"type\" argument "
423				"is required\n");
424		return -1;
425	}
426
427	if (!(flags & NLM_F_CREATE)) {
428		if (!dev) {
429			fprintf(stderr, "Not enough information: \"dev\" "
430					"argument is required.\n");
431			exit(-1);
432		}
433
434		req.i.ifi_index = ll_name_to_index(dev);
435		if (req.i.ifi_index == 0) {
436			fprintf(stderr, "Cannot find device \"%s\"\n", dev);
437			return -1;
438		}
439	} else {
440		/* Allow "ip link add dev" and "ip link add name" */
441		if (!name)
442			name = dev;
443
444		if (link) {
445			int ifindex;
446
447			ifindex = ll_name_to_index(link);
448			if (ifindex == 0) {
449				fprintf(stderr, "Cannot find device \"%s\"\n",
450					link);
451				return -1;
452			}
453			addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
454		}
455	}
456
457	if (name) {
458		len = strlen(name) + 1;
459		if (len == 1)
460			invarg("\"\" is not a valid device identifier\n", "name");
461		if (len > IFNAMSIZ)
462			invarg("\"name\" too long\n", name);
463		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
464	}
465
466	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
467		exit(2);
468
469	return 0;
470}
471
472#if IPLINK_IOCTL_COMPAT
473static int get_ctl_fd(void)
474{
475	int s_errno;
476	int fd;
477
478	fd = socket(PF_INET, SOCK_DGRAM, 0);
479	if (fd >= 0)
480		return fd;
481	s_errno = errno;
482	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
483	if (fd >= 0)
484		return fd;
485	fd = socket(PF_INET6, SOCK_DGRAM, 0);
486	if (fd >= 0)
487		return fd;
488	errno = s_errno;
489	perror("Cannot create control socket");
490	return -1;
491}
492
493static int do_chflags(const char *dev, __u32 flags, __u32 mask)
494{
495	struct ifreq ifr;
496	int fd;
497	int err;
498
499	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
500	fd = get_ctl_fd();
501	if (fd < 0)
502		return -1;
503	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
504	if (err) {
505		perror("SIOCGIFFLAGS");
506		close(fd);
507		return -1;
508	}
509	if ((ifr.ifr_flags^flags)&mask) {
510		ifr.ifr_flags &= ~mask;
511		ifr.ifr_flags |= mask&flags;
512		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
513		if (err)
514			perror("SIOCSIFFLAGS");
515	}
516	close(fd);
517	return err;
518}
519
520static int do_changename(const char *dev, const char *newdev)
521{
522	struct ifreq ifr;
523	int fd;
524	int err;
525
526	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
527	strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
528	fd = get_ctl_fd();
529	if (fd < 0)
530		return -1;
531	err = ioctl(fd, SIOCSIFNAME, &ifr);
532	if (err) {
533		perror("SIOCSIFNAME");
534		close(fd);
535		return -1;
536	}
537	close(fd);
538	return err;
539}
540
541static int set_qlen(const char *dev, int qlen)
542{
543	struct ifreq ifr;
544	int s;
545
546	s = get_ctl_fd();
547	if (s < 0)
548		return -1;
549
550	memset(&ifr, 0, sizeof(ifr));
551	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
552	ifr.ifr_qlen = qlen;
553	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
554		perror("SIOCSIFXQLEN");
555		close(s);
556		return -1;
557	}
558	close(s);
559
560	return 0;
561}
562
563static int set_mtu(const char *dev, int mtu)
564{
565	struct ifreq ifr;
566	int s;
567
568	s = get_ctl_fd();
569	if (s < 0)
570		return -1;
571
572	memset(&ifr, 0, sizeof(ifr));
573	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
574	ifr.ifr_mtu = mtu;
575	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
576		perror("SIOCSIFMTU");
577		close(s);
578		return -1;
579	}
580	close(s);
581
582	return 0;
583}
584
585static int get_address(const char *dev, int *htype)
586{
587	struct ifreq ifr;
588	struct sockaddr_ll me;
589	socklen_t alen;
590	int s;
591
592	s = socket(PF_PACKET, SOCK_DGRAM, 0);
593	if (s < 0) {
594		perror("socket(PF_PACKET)");
595		return -1;
596	}
597
598	memset(&ifr, 0, sizeof(ifr));
599	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
600	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
601		perror("SIOCGIFINDEX");
602		close(s);
603		return -1;
604	}
605
606	memset(&me, 0, sizeof(me));
607	me.sll_family = AF_PACKET;
608	me.sll_ifindex = ifr.ifr_ifindex;
609	me.sll_protocol = htons(ETH_P_LOOP);
610	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
611		perror("bind");
612		close(s);
613		return -1;
614	}
615
616	alen = sizeof(me);
617	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
618		perror("getsockname");
619		close(s);
620		return -1;
621	}
622	close(s);
623	*htype = me.sll_hatype;
624	return me.sll_halen;
625}
626
627static int parse_address(const char *dev, int hatype, int halen,
628		char *lla, struct ifreq *ifr)
629{
630	int alen;
631
632	memset(ifr, 0, sizeof(*ifr));
633	strncpy(ifr->ifr_name, dev, IFNAMSIZ);
634	ifr->ifr_hwaddr.sa_family = hatype;
635	alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
636	if (alen < 0)
637		return -1;
638	if (alen != halen) {
639		fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
640		return -1;
641	}
642	return 0;
643}
644
645static int set_address(struct ifreq *ifr, int brd)
646{
647	int s;
648
649	s = get_ctl_fd();
650	if (s < 0)
651		return -1;
652	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
653		perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
654		close(s);
655		return -1;
656	}
657	close(s);
658	return 0;
659}
660
661
662static int do_set(int argc, char **argv)
663{
664	char *dev = NULL;
665	__u32 mask = 0;
666	__u32 flags = 0;
667	int qlen = -1;
668	int mtu = -1;
669	char *newaddr = NULL;
670	char *newbrd = NULL;
671	struct ifreq ifr0, ifr1;
672	char *newname = NULL;
673	int htype, halen;
674
675	while (argc > 0) {
676		if (strcmp(*argv, "up") == 0) {
677			mask |= IFF_UP;
678			flags |= IFF_UP;
679		} else if (strcmp(*argv, "down") == 0) {
680			mask |= IFF_UP;
681			flags &= ~IFF_UP;
682		} else if (strcmp(*argv, "name") == 0) {
683			NEXT_ARG();
684			newname = *argv;
685		} else if (matches(*argv, "address") == 0) {
686			NEXT_ARG();
687			newaddr = *argv;
688		} else if (matches(*argv, "broadcast") == 0 ||
689			   strcmp(*argv, "brd") == 0) {
690			NEXT_ARG();
691			newbrd = *argv;
692		} else if (matches(*argv, "txqueuelen") == 0 ||
693			   strcmp(*argv, "qlen") == 0 ||
694			   matches(*argv, "txqlen") == 0) {
695			NEXT_ARG();
696			if (qlen != -1)
697				duparg("txqueuelen", *argv);
698			if (get_integer(&qlen,  *argv, 0))
699				invarg("Invalid \"txqueuelen\" value\n", *argv);
700		} else if (strcmp(*argv, "mtu") == 0) {
701			NEXT_ARG();
702			if (mtu != -1)
703				duparg("mtu", *argv);
704			if (get_integer(&mtu, *argv, 0))
705				invarg("Invalid \"mtu\" value\n", *argv);
706		} else if (strcmp(*argv, "multicast") == 0) {
707			NEXT_ARG();
708			mask |= IFF_MULTICAST;
709			if (strcmp(*argv, "on") == 0) {
710				flags |= IFF_MULTICAST;
711			} else if (strcmp(*argv, "off") == 0) {
712				flags &= ~IFF_MULTICAST;
713			} else
714				return on_off("multicast");
715		} else if (strcmp(*argv, "allmulticast") == 0) {
716			NEXT_ARG();
717			mask |= IFF_ALLMULTI;
718			if (strcmp(*argv, "on") == 0) {
719				flags |= IFF_ALLMULTI;
720			} else if (strcmp(*argv, "off") == 0) {
721				flags &= ~IFF_ALLMULTI;
722			} else
723				return on_off("allmulticast");
724		} else if (strcmp(*argv, "promisc") == 0) {
725			NEXT_ARG();
726			mask |= IFF_PROMISC;
727			if (strcmp(*argv, "on") == 0) {
728				flags |= IFF_PROMISC;
729			} else if (strcmp(*argv, "off") == 0) {
730				flags &= ~IFF_PROMISC;
731			} else
732				return on_off("promisc");
733		} else if (strcmp(*argv, "trailers") == 0) {
734			NEXT_ARG();
735			mask |= IFF_NOTRAILERS;
736			if (strcmp(*argv, "off") == 0) {
737				flags |= IFF_NOTRAILERS;
738			} else if (strcmp(*argv, "on") == 0) {
739				flags &= ~IFF_NOTRAILERS;
740			} else
741				return on_off("trailers");
742		} else if (strcmp(*argv, "arp") == 0) {
743			NEXT_ARG();
744			mask |= IFF_NOARP;
745			if (strcmp(*argv, "on") == 0) {
746				flags &= ~IFF_NOARP;
747			} else if (strcmp(*argv, "off") == 0) {
748				flags |= IFF_NOARP;
749			} else
750				return on_off("noarp");
751#ifdef IFF_DYNAMIC
752		} else if (matches(*argv, "dynamic") == 0) {
753			NEXT_ARG();
754			mask |= IFF_DYNAMIC;
755			if (strcmp(*argv, "on") == 0) {
756				flags |= IFF_DYNAMIC;
757			} else if (strcmp(*argv, "off") == 0) {
758				flags &= ~IFF_DYNAMIC;
759			} else
760				return on_off("dynamic");
761#endif
762		} else {
763                        if (strcmp(*argv, "dev") == 0) {
764				NEXT_ARG();
765			}
766			if (matches(*argv, "help") == 0)
767				usage();
768			if (dev)
769				duparg2("dev", *argv);
770			dev = *argv;
771		}
772		argc--; argv++;
773	}
774
775	if (!dev) {
776		fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
777		exit(-1);
778	}
779
780	if (newaddr || newbrd) {
781		halen = get_address(dev, &htype);
782		if (halen < 0)
783			return -1;
784		if (newaddr) {
785			if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
786				return -1;
787		}
788		if (newbrd) {
789			if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
790				return -1;
791		}
792	}
793
794	if (newname && strcmp(dev, newname)) {
795		if (strlen(newname) == 0)
796			invarg("\"\" is not a valid device identifier\n", "name");
797		if (do_changename(dev, newname) < 0)
798			return -1;
799		dev = newname;
800	}
801	if (qlen != -1) {
802		if (set_qlen(dev, qlen) < 0)
803			return -1;
804	}
805	if (mtu != -1) {
806		if (set_mtu(dev, mtu) < 0)
807			return -1;
808	}
809	if (newaddr || newbrd) {
810		if (newbrd) {
811			if (set_address(&ifr1, 1) < 0)
812				return -1;
813		}
814		if (newaddr) {
815			if (set_address(&ifr0, 0) < 0)
816				return -1;
817		}
818	}
819	if (mask)
820		return do_chflags(dev, flags, mask);
821	return 0;
822}
823#endif /* IPLINK_IOCTL_COMPAT */
824
825int do_iplink(int argc, char **argv)
826{
827	if (argc > 0) {
828		if (iplink_have_newlink()) {
829			if (matches(*argv, "add") == 0)
830				return iplink_modify(RTM_NEWLINK,
831						     NLM_F_CREATE|NLM_F_EXCL,
832						     argc-1, argv+1);
833			if (matches(*argv, "set") == 0 ||
834			    matches(*argv, "change") == 0)
835				return iplink_modify(RTM_NEWLINK, 0,
836						     argc-1, argv+1);
837			if (matches(*argv, "replace") == 0)
838				return iplink_modify(RTM_NEWLINK,
839						     NLM_F_CREATE|NLM_F_REPLACE,
840						     argc-1, argv+1);
841			if (matches(*argv, "delete") == 0)
842				return iplink_modify(RTM_DELLINK, 0,
843						     argc-1, argv+1);
844		} else {
845#if IPLINK_IOCTL_COMPAT
846			if (matches(*argv, "set") == 0)
847				return do_set(argc-1, argv+1);
848#endif
849		}
850		if (matches(*argv, "show") == 0 ||
851		    matches(*argv, "lst") == 0 ||
852		    matches(*argv, "list") == 0)
853			return ipaddr_list_link(argc-1, argv+1);
854		if (matches(*argv, "help") == 0)
855			usage();
856	} else
857		return ipaddr_list_link(0, NULL);
858
859	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
860	exit(-1);
861}
862