iplink.c revision 3fd86630876aed8a23e4f2c2d72e68cbb2ee331a 
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_vf(int vf, int *argcp, char ***argvp,
180			   struct iplink_req *req)
181{
182	int len, argc = *argcp;
183	char **argv = *argvp;
184	struct rtattr *vfinfo;
185
186	vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
187
188	while (NEXT_ARG_OK()) {
189		NEXT_ARG();
190		if (matches(*argv, "mac") == 0) {
191			struct ifla_vf_mac ivm;
192			NEXT_ARG();
193			ivm.vf = vf;
194			len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
195			if (len < 0)
196				return -1;
197			addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
198		} else if (matches(*argv, "vlan") == 0) {
199			struct ifla_vf_vlan ivv;
200			NEXT_ARG();
201			if (get_unsigned(&ivv.vlan, *argv, 0)) {
202				invarg("Invalid \"vlan\" value\n", *argv);
203			}
204			ivv.vf = vf;
205			ivv.qos = 0;
206			if (NEXT_ARG_OK()) {
207				NEXT_ARG();
208				if (matches(*argv, "qos") == 0) {
209					NEXT_ARG();
210					if (get_unsigned(&ivv.qos, *argv, 0)) {
211						invarg("Invalid \"qos\" value\n", *argv);
212					}
213				} else {
214					/* rewind arg */
215					PREV_ARG();
216				}
217			}
218			addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
219		} else if (matches(*argv, "rate") == 0) {
220			struct ifla_vf_tx_rate ivt;
221			NEXT_ARG();
222			if (get_unsigned(&ivt.rate, *argv, 0)) {
223				invarg("Invalid \"rate\" value\n", *argv);
224			}
225			ivt.vf = vf;
226			addattr_l(&req->n, sizeof(*req), IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
227
228		} else {
229			/* rewind arg */
230			PREV_ARG();
231			break;
232		}
233	}
234
235	if (argc == *argcp)
236		incomplete_command();
237
238	addattr_nest_end(&req->n, vfinfo);
239
240	*argcp = argc;
241	*argvp = argv;
242	return 0;
243}
244
245
246int iplink_parse(int argc, char **argv, struct iplink_req *req,
247		char **name, char **type, char **link, char **dev)
248{
249	int ret, len;
250	char abuf[32];
251	int qlen = -1;
252	int mtu = -1;
253	int netns = -1;
254	int vf = -1;
255
256	ret = argc;
257
258	while (argc > 0) {
259		if (strcmp(*argv, "up") == 0) {
260			req->i.ifi_change |= IFF_UP;
261			req->i.ifi_flags |= IFF_UP;
262		} else if (strcmp(*argv, "down") == 0) {
263			req->i.ifi_change |= IFF_UP;
264			req->i.ifi_flags &= ~IFF_UP;
265		} else if (strcmp(*argv, "name") == 0) {
266			NEXT_ARG();
267			*name = *argv;
268		} else if (matches(*argv, "link") == 0) {
269			NEXT_ARG();
270			*link = *argv;
271		} else if (matches(*argv, "address") == 0) {
272			NEXT_ARG();
273			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
274			if (len < 0)
275				return -1;
276			addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
277		} else if (matches(*argv, "broadcast") == 0 ||
278				strcmp(*argv, "brd") == 0) {
279			NEXT_ARG();
280			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
281			if (len < 0)
282				return -1;
283			addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
284		} else if (matches(*argv, "txqueuelen") == 0 ||
285				strcmp(*argv, "qlen") == 0 ||
286				matches(*argv, "txqlen") == 0) {
287			NEXT_ARG();
288			if (qlen != -1)
289				duparg("txqueuelen", *argv);
290			if (get_integer(&qlen,  *argv, 0))
291				invarg("Invalid \"txqueuelen\" value\n", *argv);
292			addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
293		} else if (strcmp(*argv, "mtu") == 0) {
294			NEXT_ARG();
295			if (mtu != -1)
296				duparg("mtu", *argv);
297			if (get_integer(&mtu, *argv, 0))
298				invarg("Invalid \"mtu\" value\n", *argv);
299			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
300                } else if (strcmp(*argv, "netns") == 0) {
301                        NEXT_ARG();
302                        if (netns != -1)
303                                duparg("netns", *argv);
304                        if (get_integer(&netns, *argv, 0))
305                                invarg("Invalid \"netns\" value\n", *argv);
306                        addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
307		} else if (strcmp(*argv, "multicast") == 0) {
308			NEXT_ARG();
309			req->i.ifi_change |= IFF_MULTICAST;
310			if (strcmp(*argv, "on") == 0) {
311				req->i.ifi_flags |= IFF_MULTICAST;
312			} else if (strcmp(*argv, "off") == 0) {
313				req->i.ifi_flags &= ~IFF_MULTICAST;
314			} else
315				return on_off("multicast");
316		} else if (strcmp(*argv, "allmulticast") == 0) {
317			NEXT_ARG();
318			req->i.ifi_change |= IFF_ALLMULTI;
319			if (strcmp(*argv, "on") == 0) {
320				req->i.ifi_flags |= IFF_ALLMULTI;
321			} else if (strcmp(*argv, "off") == 0) {
322				req->i.ifi_flags &= ~IFF_ALLMULTI;
323			} else
324				return on_off("allmulticast");
325		} else if (strcmp(*argv, "promisc") == 0) {
326			NEXT_ARG();
327			req->i.ifi_change |= IFF_PROMISC;
328			if (strcmp(*argv, "on") == 0) {
329				req->i.ifi_flags |= IFF_PROMISC;
330			} else if (strcmp(*argv, "off") == 0) {
331				req->i.ifi_flags &= ~IFF_PROMISC;
332			} else
333				return on_off("promisc");
334		} else if (strcmp(*argv, "trailers") == 0) {
335			NEXT_ARG();
336			req->i.ifi_change |= IFF_NOTRAILERS;
337			if (strcmp(*argv, "off") == 0) {
338				req->i.ifi_flags |= IFF_NOTRAILERS;
339			} else if (strcmp(*argv, "on") == 0) {
340				req->i.ifi_flags &= ~IFF_NOTRAILERS;
341			} else
342				return on_off("trailers");
343		} else if (strcmp(*argv, "arp") == 0) {
344			NEXT_ARG();
345			req->i.ifi_change |= IFF_NOARP;
346			if (strcmp(*argv, "on") == 0) {
347				req->i.ifi_flags &= ~IFF_NOARP;
348			} else if (strcmp(*argv, "off") == 0) {
349				req->i.ifi_flags |= IFF_NOARP;
350			} else
351				return on_off("noarp");
352		} else if (strcmp(*argv, "vf") == 0) {
353			struct rtattr *vflist;
354			NEXT_ARG();
355			if (get_integer(&vf,  *argv, 0)) {
356				invarg("Invalid \"vf\" value\n", *argv);
357			}
358			vflist = addattr_nest(&req->n, sizeof(*req),
359					      IFLA_VFINFO_LIST);
360			len = iplink_parse_vf(vf, &argc, &argv, req);
361			if (len < 0)
362				return -1;
363			addattr_nest_end(&req->n, vflist);
364#ifdef IFF_DYNAMIC
365		} else if (matches(*argv, "dynamic") == 0) {
366			NEXT_ARG();
367			req->i.ifi_change |= IFF_DYNAMIC;
368			if (strcmp(*argv, "on") == 0) {
369				req->i.ifi_flags |= IFF_DYNAMIC;
370			} else if (strcmp(*argv, "off") == 0) {
371				req->i.ifi_flags &= ~IFF_DYNAMIC;
372			} else
373				return on_off("dynamic");
374#endif
375		} else if (matches(*argv, "type") == 0) {
376			NEXT_ARG();
377			*type = *argv;
378			argc--; argv++;
379			break;
380		} else if (matches(*argv, "alias") == 0) {
381			NEXT_ARG();
382			addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
383				  *argv, strlen(*argv));
384			argc--; argv++;
385			break;
386		} else {
387			if (strcmp(*argv, "dev") == 0) {
388				NEXT_ARG();
389			}
390			if (matches(*argv, "help") == 0)
391				usage();
392			if (*dev)
393				duparg2("dev", *argv);
394			*dev = *argv;
395		}
396		argc--; argv++;
397	}
398
399	return ret - argc;
400}
401
402static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
403{
404	int len;
405	char *dev = NULL;
406	char *name = NULL;
407	char *link = NULL;
408	char *type = NULL;
409	struct link_util *lu = NULL;
410	struct iplink_req req;
411	int ret;
412
413	memset(&req, 0, sizeof(req));
414
415	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
416	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
417	req.n.nlmsg_type = cmd;
418	req.i.ifi_family = preferred_family;
419
420	ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev);
421	if (ret < 0)
422		return ret;
423
424	argc -= ret;
425	argv += ret;
426	ll_init_map(&rth);
427
428	if (type) {
429		struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
430		addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
431		addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
432			 strlen(type));
433
434		lu = get_link_kind(type);
435		if (lu && argc) {
436			struct rtattr * data = NLMSG_TAIL(&req.n);
437			addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
438
439			if (lu->parse_opt &&
440			    lu->parse_opt(lu, argc, argv, &req.n))
441				return -1;
442
443			data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
444		} else if (argc) {
445			if (matches(*argv, "help") == 0)
446				usage();
447			fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
448					"Try \"ip link help\".\n", *argv);
449			return -1;
450		}
451		linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
452	} else if (flags & NLM_F_CREATE) {
453		fprintf(stderr, "Not enough information: \"type\" argument "
454				"is required\n");
455		return -1;
456	}
457
458	if (!(flags & NLM_F_CREATE)) {
459		if (!dev) {
460			fprintf(stderr, "Not enough information: \"dev\" "
461					"argument is required.\n");
462			exit(-1);
463		}
464
465		req.i.ifi_index = ll_name_to_index(dev);
466		if (req.i.ifi_index == 0) {
467			fprintf(stderr, "Cannot find device \"%s\"\n", dev);
468			return -1;
469		}
470	} else {
471		/* Allow "ip link add dev" and "ip link add name" */
472		if (!name)
473			name = dev;
474
475		if (link) {
476			int ifindex;
477
478			ifindex = ll_name_to_index(link);
479			if (ifindex == 0) {
480				fprintf(stderr, "Cannot find device \"%s\"\n",
481					link);
482				return -1;
483			}
484			addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
485		}
486	}
487
488	if (name) {
489		len = strlen(name) + 1;
490		if (len == 1)
491			invarg("\"\" is not a valid device identifier\n", "name");
492		if (len > IFNAMSIZ)
493			invarg("\"name\" too long\n", name);
494		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
495	}
496
497	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
498		exit(2);
499
500	return 0;
501}
502
503#if IPLINK_IOCTL_COMPAT
504static int get_ctl_fd(void)
505{
506	int s_errno;
507	int fd;
508
509	fd = socket(PF_INET, SOCK_DGRAM, 0);
510	if (fd >= 0)
511		return fd;
512	s_errno = errno;
513	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
514	if (fd >= 0)
515		return fd;
516	fd = socket(PF_INET6, SOCK_DGRAM, 0);
517	if (fd >= 0)
518		return fd;
519	errno = s_errno;
520	perror("Cannot create control socket");
521	return -1;
522}
523
524static int do_chflags(const char *dev, __u32 flags, __u32 mask)
525{
526	struct ifreq ifr;
527	int fd;
528	int err;
529
530	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
531	fd = get_ctl_fd();
532	if (fd < 0)
533		return -1;
534	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
535	if (err) {
536		perror("SIOCGIFFLAGS");
537		close(fd);
538		return -1;
539	}
540	if ((ifr.ifr_flags^flags)&mask) {
541		ifr.ifr_flags &= ~mask;
542		ifr.ifr_flags |= mask&flags;
543		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
544		if (err)
545			perror("SIOCSIFFLAGS");
546	}
547	close(fd);
548	return err;
549}
550
551static int do_changename(const char *dev, const char *newdev)
552{
553	struct ifreq ifr;
554	int fd;
555	int err;
556
557	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
558	strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
559	fd = get_ctl_fd();
560	if (fd < 0)
561		return -1;
562	err = ioctl(fd, SIOCSIFNAME, &ifr);
563	if (err) {
564		perror("SIOCSIFNAME");
565		close(fd);
566		return -1;
567	}
568	close(fd);
569	return err;
570}
571
572static int set_qlen(const char *dev, int qlen)
573{
574	struct ifreq ifr;
575	int s;
576
577	s = get_ctl_fd();
578	if (s < 0)
579		return -1;
580
581	memset(&ifr, 0, sizeof(ifr));
582	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
583	ifr.ifr_qlen = qlen;
584	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
585		perror("SIOCSIFXQLEN");
586		close(s);
587		return -1;
588	}
589	close(s);
590
591	return 0;
592}
593
594static int set_mtu(const char *dev, int mtu)
595{
596	struct ifreq ifr;
597	int s;
598
599	s = get_ctl_fd();
600	if (s < 0)
601		return -1;
602
603	memset(&ifr, 0, sizeof(ifr));
604	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
605	ifr.ifr_mtu = mtu;
606	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
607		perror("SIOCSIFMTU");
608		close(s);
609		return -1;
610	}
611	close(s);
612
613	return 0;
614}
615
616static int get_address(const char *dev, int *htype)
617{
618	struct ifreq ifr;
619	struct sockaddr_ll me;
620	socklen_t alen;
621	int s;
622
623	s = socket(PF_PACKET, SOCK_DGRAM, 0);
624	if (s < 0) {
625		perror("socket(PF_PACKET)");
626		return -1;
627	}
628
629	memset(&ifr, 0, sizeof(ifr));
630	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
631	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
632		perror("SIOCGIFINDEX");
633		close(s);
634		return -1;
635	}
636
637	memset(&me, 0, sizeof(me));
638	me.sll_family = AF_PACKET;
639	me.sll_ifindex = ifr.ifr_ifindex;
640	me.sll_protocol = htons(ETH_P_LOOP);
641	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
642		perror("bind");
643		close(s);
644		return -1;
645	}
646
647	alen = sizeof(me);
648	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
649		perror("getsockname");
650		close(s);
651		return -1;
652	}
653	close(s);
654	*htype = me.sll_hatype;
655	return me.sll_halen;
656}
657
658static int parse_address(const char *dev, int hatype, int halen,
659		char *lla, struct ifreq *ifr)
660{
661	int alen;
662
663	memset(ifr, 0, sizeof(*ifr));
664	strncpy(ifr->ifr_name, dev, IFNAMSIZ);
665	ifr->ifr_hwaddr.sa_family = hatype;
666	alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
667	if (alen < 0)
668		return -1;
669	if (alen != halen) {
670		fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
671		return -1;
672	}
673	return 0;
674}
675
676static int set_address(struct ifreq *ifr, int brd)
677{
678	int s;
679
680	s = get_ctl_fd();
681	if (s < 0)
682		return -1;
683	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
684		perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
685		close(s);
686		return -1;
687	}
688	close(s);
689	return 0;
690}
691
692
693static int do_set(int argc, char **argv)
694{
695	char *dev = NULL;
696	__u32 mask = 0;
697	__u32 flags = 0;
698	int qlen = -1;
699	int mtu = -1;
700	char *newaddr = NULL;
701	char *newbrd = NULL;
702	struct ifreq ifr0, ifr1;
703	char *newname = NULL;
704	int htype, halen;
705
706	while (argc > 0) {
707		if (strcmp(*argv, "up") == 0) {
708			mask |= IFF_UP;
709			flags |= IFF_UP;
710		} else if (strcmp(*argv, "down") == 0) {
711			mask |= IFF_UP;
712			flags &= ~IFF_UP;
713		} else if (strcmp(*argv, "name") == 0) {
714			NEXT_ARG();
715			newname = *argv;
716		} else if (matches(*argv, "address") == 0) {
717			NEXT_ARG();
718			newaddr = *argv;
719		} else if (matches(*argv, "broadcast") == 0 ||
720			   strcmp(*argv, "brd") == 0) {
721			NEXT_ARG();
722			newbrd = *argv;
723		} else if (matches(*argv, "txqueuelen") == 0 ||
724			   strcmp(*argv, "qlen") == 0 ||
725			   matches(*argv, "txqlen") == 0) {
726			NEXT_ARG();
727			if (qlen != -1)
728				duparg("txqueuelen", *argv);
729			if (get_integer(&qlen,  *argv, 0))
730				invarg("Invalid \"txqueuelen\" value\n", *argv);
731		} else if (strcmp(*argv, "mtu") == 0) {
732			NEXT_ARG();
733			if (mtu != -1)
734				duparg("mtu", *argv);
735			if (get_integer(&mtu, *argv, 0))
736				invarg("Invalid \"mtu\" value\n", *argv);
737		} else if (strcmp(*argv, "multicast") == 0) {
738			NEXT_ARG();
739			mask |= IFF_MULTICAST;
740			if (strcmp(*argv, "on") == 0) {
741				flags |= IFF_MULTICAST;
742			} else if (strcmp(*argv, "off") == 0) {
743				flags &= ~IFF_MULTICAST;
744			} else
745				return on_off("multicast");
746		} else if (strcmp(*argv, "allmulticast") == 0) {
747			NEXT_ARG();
748			mask |= IFF_ALLMULTI;
749			if (strcmp(*argv, "on") == 0) {
750				flags |= IFF_ALLMULTI;
751			} else if (strcmp(*argv, "off") == 0) {
752				flags &= ~IFF_ALLMULTI;
753			} else
754				return on_off("allmulticast");
755		} else if (strcmp(*argv, "promisc") == 0) {
756			NEXT_ARG();
757			mask |= IFF_PROMISC;
758			if (strcmp(*argv, "on") == 0) {
759				flags |= IFF_PROMISC;
760			} else if (strcmp(*argv, "off") == 0) {
761				flags &= ~IFF_PROMISC;
762			} else
763				return on_off("promisc");
764		} else if (strcmp(*argv, "trailers") == 0) {
765			NEXT_ARG();
766			mask |= IFF_NOTRAILERS;
767			if (strcmp(*argv, "off") == 0) {
768				flags |= IFF_NOTRAILERS;
769			} else if (strcmp(*argv, "on") == 0) {
770				flags &= ~IFF_NOTRAILERS;
771			} else
772				return on_off("trailers");
773		} else if (strcmp(*argv, "arp") == 0) {
774			NEXT_ARG();
775			mask |= IFF_NOARP;
776			if (strcmp(*argv, "on") == 0) {
777				flags &= ~IFF_NOARP;
778			} else if (strcmp(*argv, "off") == 0) {
779				flags |= IFF_NOARP;
780			} else
781				return on_off("noarp");
782#ifdef IFF_DYNAMIC
783		} else if (matches(*argv, "dynamic") == 0) {
784			NEXT_ARG();
785			mask |= IFF_DYNAMIC;
786			if (strcmp(*argv, "on") == 0) {
787				flags |= IFF_DYNAMIC;
788			} else if (strcmp(*argv, "off") == 0) {
789				flags &= ~IFF_DYNAMIC;
790			} else
791				return on_off("dynamic");
792#endif
793		} else {
794                        if (strcmp(*argv, "dev") == 0) {
795				NEXT_ARG();
796			}
797			if (matches(*argv, "help") == 0)
798				usage();
799			if (dev)
800				duparg2("dev", *argv);
801			dev = *argv;
802		}
803		argc--; argv++;
804	}
805
806	if (!dev) {
807		fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
808		exit(-1);
809	}
810
811	if (newaddr || newbrd) {
812		halen = get_address(dev, &htype);
813		if (halen < 0)
814			return -1;
815		if (newaddr) {
816			if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
817				return -1;
818		}
819		if (newbrd) {
820			if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
821				return -1;
822		}
823	}
824
825	if (newname && strcmp(dev, newname)) {
826		if (strlen(newname) == 0)
827			invarg("\"\" is not a valid device identifier\n", "name");
828		if (do_changename(dev, newname) < 0)
829			return -1;
830		dev = newname;
831	}
832	if (qlen != -1) {
833		if (set_qlen(dev, qlen) < 0)
834			return -1;
835	}
836	if (mtu != -1) {
837		if (set_mtu(dev, mtu) < 0)
838			return -1;
839	}
840	if (newaddr || newbrd) {
841		if (newbrd) {
842			if (set_address(&ifr1, 1) < 0)
843				return -1;
844		}
845		if (newaddr) {
846			if (set_address(&ifr0, 0) < 0)
847				return -1;
848		}
849	}
850	if (mask)
851		return do_chflags(dev, flags, mask);
852	return 0;
853}
854#endif /* IPLINK_IOCTL_COMPAT */
855
856int do_iplink(int argc, char **argv)
857{
858	if (argc > 0) {
859		if (iplink_have_newlink()) {
860			if (matches(*argv, "add") == 0)
861				return iplink_modify(RTM_NEWLINK,
862						     NLM_F_CREATE|NLM_F_EXCL,
863						     argc-1, argv+1);
864			if (matches(*argv, "set") == 0 ||
865			    matches(*argv, "change") == 0)
866				return iplink_modify(RTM_NEWLINK, 0,
867						     argc-1, argv+1);
868			if (matches(*argv, "replace") == 0)
869				return iplink_modify(RTM_NEWLINK,
870						     NLM_F_CREATE|NLM_F_REPLACE,
871						     argc-1, argv+1);
872			if (matches(*argv, "delete") == 0)
873				return iplink_modify(RTM_DELLINK, 0,
874						     argc-1, argv+1);
875		} else {
876#if IPLINK_IOCTL_COMPAT
877			if (matches(*argv, "set") == 0)
878				return do_set(argc-1, argv+1);
879#endif
880		}
881		if (matches(*argv, "show") == 0 ||
882		    matches(*argv, "lst") == 0 ||
883		    matches(*argv, "list") == 0)
884			return ipaddr_list_link(argc-1, argv+1);
885		if (matches(*argv, "help") == 0)
886			usage();
887	} else
888		return ipaddr_list_link(0, NULL);
889
890	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
891	exit(-1);
892}
893