iplink.c revision 7b8179c780a1abd547e5002c4e6fba898c6d72bb 
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 { dev DEVICE | group DEVGROUP } [ { 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, "	                  [ netns NAME ]\n");
71	fprintf(stderr, "			  [ alias NAME ]\n");
72	fprintf(stderr, "	                  [ vf NUM [ mac LLADDR ]\n");
73	fprintf(stderr, "				   [ vlan VLANID [ qos VLAN-QOS ] ]\n");
74
75	fprintf(stderr, "				   [ rate TXRATE ] ] \n");
76
77	fprintf(stderr, "				   [ spoofchk { on | off} ] ] \n");
78	fprintf(stderr, "			  [ master DEVICE ]\n");
79	fprintf(stderr, "			  [ nomaster ]\n");
80	fprintf(stderr, "       ip link show [ DEVICE | group GROUP ]\n");
81
82	if (iplink_have_newlink()) {
83		fprintf(stderr, "\n");
84		fprintf(stderr, "TYPE := { vlan | veth | vcan | dummy | ifb | macvlan | can | bridge }\n");
85	}
86	exit(-1);
87}
88
89static void usage(void)
90{
91	iplink_usage();
92}
93
94static int on_off(char *msg)
95{
96	fprintf(stderr, "Error: argument of \"%s\" must be \"on\" or \"off\"\n", msg);
97	return -1;
98}
99
100static void *BODY;		/* cached dlopen(NULL) handle */
101static struct link_util *linkutil_list;
102
103struct link_util *get_link_kind(const char *id)
104{
105	void *dlh;
106	char buf[256];
107	struct link_util *l;
108
109	for (l = linkutil_list; l; l = l->next)
110		if (strcmp(l->id, id) == 0)
111			return l;
112
113	snprintf(buf, sizeof(buf), LIBDIR "/ip/link_%s.so", id);
114	dlh = dlopen(buf, RTLD_LAZY);
115	if (dlh == NULL) {
116		/* look in current binary, only open once */
117		dlh = BODY;
118		if (dlh == NULL) {
119			dlh = BODY = dlopen(NULL, RTLD_LAZY);
120			if (dlh == NULL)
121				return NULL;
122		}
123	}
124
125	snprintf(buf, sizeof(buf), "%s_link_util", id);
126	l = dlsym(dlh, buf);
127	if (l == NULL)
128		return NULL;
129
130	l->next = linkutil_list;
131	linkutil_list = l;
132	return l;
133}
134
135#if IPLINK_IOCTL_COMPAT
136static int have_rtnl_newlink = -1;
137
138static int accept_msg(const struct sockaddr_nl *who,
139		      struct nlmsghdr *n, void *arg)
140{
141	struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
142
143	if (n->nlmsg_type == NLMSG_ERROR &&
144	    (err->error == -EOPNOTSUPP || err->error == -EINVAL))
145		have_rtnl_newlink = 0;
146	else
147		have_rtnl_newlink = 1;
148	return -1;
149}
150
151static int iplink_have_newlink(void)
152{
153	struct {
154		struct nlmsghdr		n;
155		struct ifinfomsg	i;
156		char			buf[1024];
157	} req;
158
159	if (have_rtnl_newlink < 0) {
160		memset(&req, 0, sizeof(req));
161
162		req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
163		req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
164		req.n.nlmsg_type = RTM_NEWLINK;
165		req.i.ifi_family = AF_UNSPEC;
166
167		rtnl_send(&rth, (char *)&req.n, req.n.nlmsg_len);
168		rtnl_listen(&rth, accept_msg, NULL);
169	}
170	return have_rtnl_newlink;
171}
172#else /* IPLINK_IOCTL_COMPAT */
173static int iplink_have_newlink(void)
174{
175	return 1;
176}
177#endif /* ! IPLINK_IOCTL_COMPAT */
178
179struct iplink_req {
180	struct nlmsghdr		n;
181	struct ifinfomsg	i;
182	char			buf[1024];
183};
184
185int iplink_parse_vf(int vf, int *argcp, char ***argvp,
186			   struct iplink_req *req)
187{
188	int len, argc = *argcp;
189	char **argv = *argvp;
190	struct rtattr *vfinfo;
191
192	vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
193
194	while (NEXT_ARG_OK()) {
195		NEXT_ARG();
196		if (matches(*argv, "mac") == 0) {
197			struct ifla_vf_mac ivm;
198			NEXT_ARG();
199			ivm.vf = vf;
200			len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
201			if (len < 0)
202				return -1;
203			addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
204		} else if (matches(*argv, "vlan") == 0) {
205			struct ifla_vf_vlan ivv;
206			NEXT_ARG();
207			if (get_unsigned(&ivv.vlan, *argv, 0)) {
208				invarg("Invalid \"vlan\" value\n", *argv);
209			}
210			ivv.vf = vf;
211			ivv.qos = 0;
212			if (NEXT_ARG_OK()) {
213				NEXT_ARG();
214				if (matches(*argv, "qos") == 0) {
215					NEXT_ARG();
216					if (get_unsigned(&ivv.qos, *argv, 0)) {
217						invarg("Invalid \"qos\" value\n", *argv);
218					}
219				} else {
220					/* rewind arg */
221					PREV_ARG();
222				}
223			}
224			addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
225		} else if (matches(*argv, "rate") == 0) {
226			struct ifla_vf_tx_rate ivt;
227			NEXT_ARG();
228			if (get_unsigned(&ivt.rate, *argv, 0)) {
229				invarg("Invalid \"rate\" value\n", *argv);
230			}
231			ivt.vf = vf;
232			addattr_l(&req->n, sizeof(*req), IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
233
234		} else if (matches(*argv, "spoofchk") == 0) {
235			struct ifla_vf_spoofchk ivs;
236			NEXT_ARG();
237			if (matches(*argv, "on") == 0)
238				ivs.setting = 1;
239			else if (matches(*argv, "off") == 0)
240				ivs.setting = 0;
241			else
242				invarg("Invalid \"spoofchk\" value\n", *argv);
243			ivs.vf = vf;
244			addattr_l(&req->n, sizeof(*req), IFLA_VF_SPOOFCHK, &ivs, sizeof(ivs));
245
246		} else {
247			/* rewind arg */
248			PREV_ARG();
249			break;
250		}
251	}
252
253	if (argc == *argcp)
254		incomplete_command();
255
256	addattr_nest_end(&req->n, vfinfo);
257
258	*argcp = argc;
259	*argvp = argv;
260	return 0;
261}
262
263
264int iplink_parse(int argc, char **argv, struct iplink_req *req,
265		char **name, char **type, char **link, char **dev, int *group)
266{
267	int ret, len;
268	char abuf[32];
269	int qlen = -1;
270	int mtu = -1;
271	int netns = -1;
272	int vf = -1;
273
274	*group = -1;
275	ret = argc;
276
277	while (argc > 0) {
278		if (strcmp(*argv, "up") == 0) {
279			req->i.ifi_change |= IFF_UP;
280			req->i.ifi_flags |= IFF_UP;
281		} else if (strcmp(*argv, "down") == 0) {
282			req->i.ifi_change |= IFF_UP;
283			req->i.ifi_flags &= ~IFF_UP;
284		} else if (strcmp(*argv, "name") == 0) {
285			NEXT_ARG();
286			*name = *argv;
287		} else if (matches(*argv, "link") == 0) {
288			NEXT_ARG();
289			*link = *argv;
290		} else if (matches(*argv, "address") == 0) {
291			NEXT_ARG();
292			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
293			if (len < 0)
294				return -1;
295			addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
296		} else if (matches(*argv, "broadcast") == 0 ||
297				strcmp(*argv, "brd") == 0) {
298			NEXT_ARG();
299			len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
300			if (len < 0)
301				return -1;
302			addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
303		} else if (matches(*argv, "txqueuelen") == 0 ||
304				strcmp(*argv, "qlen") == 0 ||
305				matches(*argv, "txqlen") == 0) {
306			NEXT_ARG();
307			if (qlen != -1)
308				duparg("txqueuelen", *argv);
309			if (get_integer(&qlen,  *argv, 0))
310				invarg("Invalid \"txqueuelen\" value\n", *argv);
311			addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
312		} else if (strcmp(*argv, "mtu") == 0) {
313			NEXT_ARG();
314			if (mtu != -1)
315				duparg("mtu", *argv);
316			if (get_integer(&mtu, *argv, 0))
317				invarg("Invalid \"mtu\" value\n", *argv);
318			addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
319                } else if (strcmp(*argv, "netns") == 0) {
320                        NEXT_ARG();
321                        if (netns != -1)
322                                duparg("netns", *argv);
323			if ((netns = get_netns_fd(*argv)) >= 0)
324				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD, &netns, 4);
325			else if (get_integer(&netns, *argv, 0) == 0)
326				addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
327			else
328                                invarg("Invalid \"netns\" value\n", *argv);
329		} else if (strcmp(*argv, "multicast") == 0) {
330			NEXT_ARG();
331			req->i.ifi_change |= IFF_MULTICAST;
332			if (strcmp(*argv, "on") == 0) {
333				req->i.ifi_flags |= IFF_MULTICAST;
334			} else if (strcmp(*argv, "off") == 0) {
335				req->i.ifi_flags &= ~IFF_MULTICAST;
336			} else
337				return on_off("multicast");
338		} else if (strcmp(*argv, "allmulticast") == 0) {
339			NEXT_ARG();
340			req->i.ifi_change |= IFF_ALLMULTI;
341			if (strcmp(*argv, "on") == 0) {
342				req->i.ifi_flags |= IFF_ALLMULTI;
343			} else if (strcmp(*argv, "off") == 0) {
344				req->i.ifi_flags &= ~IFF_ALLMULTI;
345			} else
346				return on_off("allmulticast");
347		} else if (strcmp(*argv, "promisc") == 0) {
348			NEXT_ARG();
349			req->i.ifi_change |= IFF_PROMISC;
350			if (strcmp(*argv, "on") == 0) {
351				req->i.ifi_flags |= IFF_PROMISC;
352			} else if (strcmp(*argv, "off") == 0) {
353				req->i.ifi_flags &= ~IFF_PROMISC;
354			} else
355				return on_off("promisc");
356		} else if (strcmp(*argv, "trailers") == 0) {
357			NEXT_ARG();
358			req->i.ifi_change |= IFF_NOTRAILERS;
359			if (strcmp(*argv, "off") == 0) {
360				req->i.ifi_flags |= IFF_NOTRAILERS;
361			} else if (strcmp(*argv, "on") == 0) {
362				req->i.ifi_flags &= ~IFF_NOTRAILERS;
363			} else
364				return on_off("trailers");
365		} else if (strcmp(*argv, "arp") == 0) {
366			NEXT_ARG();
367			req->i.ifi_change |= IFF_NOARP;
368			if (strcmp(*argv, "on") == 0) {
369				req->i.ifi_flags &= ~IFF_NOARP;
370			} else if (strcmp(*argv, "off") == 0) {
371				req->i.ifi_flags |= IFF_NOARP;
372			} else
373				return on_off("noarp");
374		} else if (strcmp(*argv, "vf") == 0) {
375			struct rtattr *vflist;
376			NEXT_ARG();
377			if (get_integer(&vf,  *argv, 0)) {
378				invarg("Invalid \"vf\" value\n", *argv);
379			}
380			vflist = addattr_nest(&req->n, sizeof(*req),
381					      IFLA_VFINFO_LIST);
382			len = iplink_parse_vf(vf, &argc, &argv, req);
383			if (len < 0)
384				return -1;
385			addattr_nest_end(&req->n, vflist);
386		} else if (matches(*argv, "master") == 0) {
387			int ifindex;
388			NEXT_ARG();
389			ifindex = ll_name_to_index(*argv);
390			if (!ifindex)
391				invarg("Device does not exist\n", *argv);
392			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
393				  &ifindex, 4);
394		} else if (matches(*argv, "nomaster") == 0) {
395			int ifindex = 0;
396			addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
397				  &ifindex, 4);
398		} else if (matches(*argv, "dynamic") == 0) {
399			NEXT_ARG();
400			req->i.ifi_change |= IFF_DYNAMIC;
401			if (strcmp(*argv, "on") == 0) {
402				req->i.ifi_flags |= IFF_DYNAMIC;
403			} else if (strcmp(*argv, "off") == 0) {
404				req->i.ifi_flags &= ~IFF_DYNAMIC;
405			} else
406				return on_off("dynamic");
407		} else if (matches(*argv, "type") == 0) {
408			NEXT_ARG();
409			*type = *argv;
410			argc--; argv++;
411			break;
412		} else if (matches(*argv, "alias") == 0) {
413			NEXT_ARG();
414			addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
415				  *argv, strlen(*argv));
416			argc--; argv++;
417			break;
418		} else if (strcmp(*argv, "group") == 0) {
419			NEXT_ARG();
420			if (*group != -1)
421				duparg("group", *argv);
422			if (rtnl_group_a2n(group, *argv))
423				invarg("Invalid \"group\" value\n", *argv);
424		} else {
425			if (strcmp(*argv, "dev") == 0) {
426				NEXT_ARG();
427			}
428			if (matches(*argv, "help") == 0)
429				usage();
430			if (*dev)
431				duparg2("dev", *argv);
432			*dev = *argv;
433		}
434		argc--; argv++;
435	}
436
437	return ret - argc;
438}
439
440static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
441{
442	int len;
443	char *dev = NULL;
444	char *name = NULL;
445	char *link = NULL;
446	char *type = NULL;
447	int group;
448	struct link_util *lu = NULL;
449	struct iplink_req req;
450	int ret;
451
452	memset(&req, 0, sizeof(req));
453
454	req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
455	req.n.nlmsg_flags = NLM_F_REQUEST|flags;
456	req.n.nlmsg_type = cmd;
457	req.i.ifi_family = preferred_family;
458
459	ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group);
460	if (ret < 0)
461		return ret;
462
463	argc -= ret;
464	argv += ret;
465
466	if (group != -1) {
467		if (dev)
468			addattr_l(&req.n, sizeof(req), IFLA_GROUP,
469					&group, sizeof(group));
470		else {
471			if (argc) {
472				fprintf(stderr, "Garbage instead of arguments "
473						"\"%s ...\". Try \"ip link "
474						"help\".\n", *argv);
475				return -1;
476			}
477			if (flags & NLM_F_CREATE) {
478				fprintf(stderr, "group cannot be used when "
479						"creating devices.\n");
480				return -1;
481			}
482
483			req.i.ifi_index = 0;
484			addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
485			if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
486				exit(2);
487			return 0;
488		}
489	}
490
491	ll_init_map(&rth);
492
493	if (type) {
494		struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
495		addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
496		addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
497			 strlen(type));
498
499		lu = get_link_kind(type);
500		if (lu && argc) {
501			struct rtattr * data = NLMSG_TAIL(&req.n);
502			addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
503
504			if (lu->parse_opt &&
505			    lu->parse_opt(lu, argc, argv, &req.n))
506				return -1;
507
508			data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
509		} else if (argc) {
510			if (matches(*argv, "help") == 0)
511				usage();
512			fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
513					"Try \"ip link help\".\n", *argv);
514			return -1;
515		}
516		linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
517	} else if (flags & NLM_F_CREATE) {
518		fprintf(stderr, "Not enough information: \"type\" argument "
519				"is required\n");
520		return -1;
521	}
522
523	if (!(flags & NLM_F_CREATE)) {
524		if (!dev) {
525			fprintf(stderr, "Not enough information: \"dev\" "
526					"argument is required.\n");
527			exit(-1);
528		}
529
530		req.i.ifi_index = ll_name_to_index(dev);
531		if (req.i.ifi_index == 0) {
532			fprintf(stderr, "Cannot find device \"%s\"\n", dev);
533			return -1;
534		}
535	} else {
536		/* Allow "ip link add dev" and "ip link add name" */
537		if (!name)
538			name = dev;
539
540		if (link) {
541			int ifindex;
542
543			ifindex = ll_name_to_index(link);
544			if (ifindex == 0) {
545				fprintf(stderr, "Cannot find device \"%s\"\n",
546					link);
547				return -1;
548			}
549			addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
550		}
551	}
552
553	if (name) {
554		len = strlen(name) + 1;
555		if (len == 1)
556			invarg("\"\" is not a valid device identifier\n", "name");
557		if (len > IFNAMSIZ)
558			invarg("\"name\" too long\n", name);
559		addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
560	}
561
562	if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
563		exit(2);
564
565	return 0;
566}
567
568#if IPLINK_IOCTL_COMPAT
569static int get_ctl_fd(void)
570{
571	int s_errno;
572	int fd;
573
574	fd = socket(PF_INET, SOCK_DGRAM, 0);
575	if (fd >= 0)
576		return fd;
577	s_errno = errno;
578	fd = socket(PF_PACKET, SOCK_DGRAM, 0);
579	if (fd >= 0)
580		return fd;
581	fd = socket(PF_INET6, SOCK_DGRAM, 0);
582	if (fd >= 0)
583		return fd;
584	errno = s_errno;
585	perror("Cannot create control socket");
586	return -1;
587}
588
589static int do_chflags(const char *dev, __u32 flags, __u32 mask)
590{
591	struct ifreq ifr;
592	int fd;
593	int err;
594
595	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
596	fd = get_ctl_fd();
597	if (fd < 0)
598		return -1;
599	err = ioctl(fd, SIOCGIFFLAGS, &ifr);
600	if (err) {
601		perror("SIOCGIFFLAGS");
602		close(fd);
603		return -1;
604	}
605	if ((ifr.ifr_flags^flags)&mask) {
606		ifr.ifr_flags &= ~mask;
607		ifr.ifr_flags |= mask&flags;
608		err = ioctl(fd, SIOCSIFFLAGS, &ifr);
609		if (err)
610			perror("SIOCSIFFLAGS");
611	}
612	close(fd);
613	return err;
614}
615
616static int do_changename(const char *dev, const char *newdev)
617{
618	struct ifreq ifr;
619	int fd;
620	int err;
621
622	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
623	strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
624	fd = get_ctl_fd();
625	if (fd < 0)
626		return -1;
627	err = ioctl(fd, SIOCSIFNAME, &ifr);
628	if (err) {
629		perror("SIOCSIFNAME");
630		close(fd);
631		return -1;
632	}
633	close(fd);
634	return err;
635}
636
637static int set_qlen(const char *dev, int qlen)
638{
639	struct ifreq ifr;
640	int s;
641
642	s = get_ctl_fd();
643	if (s < 0)
644		return -1;
645
646	memset(&ifr, 0, sizeof(ifr));
647	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
648	ifr.ifr_qlen = qlen;
649	if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
650		perror("SIOCSIFXQLEN");
651		close(s);
652		return -1;
653	}
654	close(s);
655
656	return 0;
657}
658
659static int set_mtu(const char *dev, int mtu)
660{
661	struct ifreq ifr;
662	int s;
663
664	s = get_ctl_fd();
665	if (s < 0)
666		return -1;
667
668	memset(&ifr, 0, sizeof(ifr));
669	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
670	ifr.ifr_mtu = mtu;
671	if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
672		perror("SIOCSIFMTU");
673		close(s);
674		return -1;
675	}
676	close(s);
677
678	return 0;
679}
680
681static int get_address(const char *dev, int *htype)
682{
683	struct ifreq ifr;
684	struct sockaddr_ll me;
685	socklen_t alen;
686	int s;
687
688	s = socket(PF_PACKET, SOCK_DGRAM, 0);
689	if (s < 0) {
690		perror("socket(PF_PACKET)");
691		return -1;
692	}
693
694	memset(&ifr, 0, sizeof(ifr));
695	strncpy(ifr.ifr_name, dev, IFNAMSIZ);
696	if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
697		perror("SIOCGIFINDEX");
698		close(s);
699		return -1;
700	}
701
702	memset(&me, 0, sizeof(me));
703	me.sll_family = AF_PACKET;
704	me.sll_ifindex = ifr.ifr_ifindex;
705	me.sll_protocol = htons(ETH_P_LOOP);
706	if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
707		perror("bind");
708		close(s);
709		return -1;
710	}
711
712	alen = sizeof(me);
713	if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
714		perror("getsockname");
715		close(s);
716		return -1;
717	}
718	close(s);
719	*htype = me.sll_hatype;
720	return me.sll_halen;
721}
722
723static int parse_address(const char *dev, int hatype, int halen,
724		char *lla, struct ifreq *ifr)
725{
726	int alen;
727
728	memset(ifr, 0, sizeof(*ifr));
729	strncpy(ifr->ifr_name, dev, IFNAMSIZ);
730	ifr->ifr_hwaddr.sa_family = hatype;
731	alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
732	if (alen < 0)
733		return -1;
734	if (alen != halen) {
735		fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
736		return -1;
737	}
738	return 0;
739}
740
741static int set_address(struct ifreq *ifr, int brd)
742{
743	int s;
744
745	s = get_ctl_fd();
746	if (s < 0)
747		return -1;
748	if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
749		perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
750		close(s);
751		return -1;
752	}
753	close(s);
754	return 0;
755}
756
757
758static int do_set(int argc, char **argv)
759{
760	char *dev = NULL;
761	__u32 mask = 0;
762	__u32 flags = 0;
763	int qlen = -1;
764	int mtu = -1;
765	char *newaddr = NULL;
766	char *newbrd = NULL;
767	struct ifreq ifr0, ifr1;
768	char *newname = NULL;
769	int htype, halen;
770
771	while (argc > 0) {
772		if (strcmp(*argv, "up") == 0) {
773			mask |= IFF_UP;
774			flags |= IFF_UP;
775		} else if (strcmp(*argv, "down") == 0) {
776			mask |= IFF_UP;
777			flags &= ~IFF_UP;
778		} else if (strcmp(*argv, "name") == 0) {
779			NEXT_ARG();
780			newname = *argv;
781		} else if (matches(*argv, "address") == 0) {
782			NEXT_ARG();
783			newaddr = *argv;
784		} else if (matches(*argv, "broadcast") == 0 ||
785			   strcmp(*argv, "brd") == 0) {
786			NEXT_ARG();
787			newbrd = *argv;
788		} else if (matches(*argv, "txqueuelen") == 0 ||
789			   strcmp(*argv, "qlen") == 0 ||
790			   matches(*argv, "txqlen") == 0) {
791			NEXT_ARG();
792			if (qlen != -1)
793				duparg("txqueuelen", *argv);
794			if (get_integer(&qlen,  *argv, 0))
795				invarg("Invalid \"txqueuelen\" value\n", *argv);
796		} else if (strcmp(*argv, "mtu") == 0) {
797			NEXT_ARG();
798			if (mtu != -1)
799				duparg("mtu", *argv);
800			if (get_integer(&mtu, *argv, 0))
801				invarg("Invalid \"mtu\" value\n", *argv);
802		} else if (strcmp(*argv, "multicast") == 0) {
803			NEXT_ARG();
804			mask |= IFF_MULTICAST;
805			if (strcmp(*argv, "on") == 0) {
806				flags |= IFF_MULTICAST;
807			} else if (strcmp(*argv, "off") == 0) {
808				flags &= ~IFF_MULTICAST;
809			} else
810				return on_off("multicast");
811		} else if (strcmp(*argv, "allmulticast") == 0) {
812			NEXT_ARG();
813			mask |= IFF_ALLMULTI;
814			if (strcmp(*argv, "on") == 0) {
815				flags |= IFF_ALLMULTI;
816			} else if (strcmp(*argv, "off") == 0) {
817				flags &= ~IFF_ALLMULTI;
818			} else
819				return on_off("allmulticast");
820		} else if (strcmp(*argv, "promisc") == 0) {
821			NEXT_ARG();
822			mask |= IFF_PROMISC;
823			if (strcmp(*argv, "on") == 0) {
824				flags |= IFF_PROMISC;
825			} else if (strcmp(*argv, "off") == 0) {
826				flags &= ~IFF_PROMISC;
827			} else
828				return on_off("promisc");
829		} else if (strcmp(*argv, "trailers") == 0) {
830			NEXT_ARG();
831			mask |= IFF_NOTRAILERS;
832			if (strcmp(*argv, "off") == 0) {
833				flags |= IFF_NOTRAILERS;
834			} else if (strcmp(*argv, "on") == 0) {
835				flags &= ~IFF_NOTRAILERS;
836			} else
837				return on_off("trailers");
838		} else if (strcmp(*argv, "arp") == 0) {
839			NEXT_ARG();
840			mask |= IFF_NOARP;
841			if (strcmp(*argv, "on") == 0) {
842				flags &= ~IFF_NOARP;
843			} else if (strcmp(*argv, "off") == 0) {
844				flags |= IFF_NOARP;
845			} else
846				return on_off("noarp");
847		} else if (matches(*argv, "dynamic") == 0) {
848			NEXT_ARG();
849			mask |= IFF_DYNAMIC;
850			if (strcmp(*argv, "on") == 0) {
851				flags |= IFF_DYNAMIC;
852			} else if (strcmp(*argv, "off") == 0) {
853				flags &= ~IFF_DYNAMIC;
854			} else
855				return on_off("dynamic");
856		} else {
857                        if (strcmp(*argv, "dev") == 0) {
858				NEXT_ARG();
859			}
860			if (matches(*argv, "help") == 0)
861				usage();
862			if (dev)
863				duparg2("dev", *argv);
864			dev = *argv;
865		}
866		argc--; argv++;
867	}
868
869	if (!dev) {
870		fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
871		exit(-1);
872	}
873
874	if (newaddr || newbrd) {
875		halen = get_address(dev, &htype);
876		if (halen < 0)
877			return -1;
878		if (newaddr) {
879			if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
880				return -1;
881		}
882		if (newbrd) {
883			if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
884				return -1;
885		}
886	}
887
888	if (newname && strcmp(dev, newname)) {
889		if (strlen(newname) == 0)
890			invarg("\"\" is not a valid device identifier\n", "name");
891		if (do_changename(dev, newname) < 0)
892			return -1;
893		dev = newname;
894	}
895	if (qlen != -1) {
896		if (set_qlen(dev, qlen) < 0)
897			return -1;
898	}
899	if (mtu != -1) {
900		if (set_mtu(dev, mtu) < 0)
901			return -1;
902	}
903	if (newaddr || newbrd) {
904		if (newbrd) {
905			if (set_address(&ifr1, 1) < 0)
906				return -1;
907		}
908		if (newaddr) {
909			if (set_address(&ifr0, 0) < 0)
910				return -1;
911		}
912	}
913	if (mask)
914		return do_chflags(dev, flags, mask);
915	return 0;
916}
917#endif /* IPLINK_IOCTL_COMPAT */
918
919int do_iplink(int argc, char **argv)
920{
921	if (argc > 0) {
922		if (iplink_have_newlink()) {
923			if (matches(*argv, "add") == 0)
924				return iplink_modify(RTM_NEWLINK,
925						     NLM_F_CREATE|NLM_F_EXCL,
926						     argc-1, argv+1);
927			if (matches(*argv, "set") == 0 ||
928			    matches(*argv, "change") == 0)
929				return iplink_modify(RTM_NEWLINK, 0,
930						     argc-1, argv+1);
931			if (matches(*argv, "replace") == 0)
932				return iplink_modify(RTM_NEWLINK,
933						     NLM_F_CREATE|NLM_F_REPLACE,
934						     argc-1, argv+1);
935			if (matches(*argv, "delete") == 0)
936				return iplink_modify(RTM_DELLINK, 0,
937						     argc-1, argv+1);
938		} else {
939#if IPLINK_IOCTL_COMPAT
940			if (matches(*argv, "set") == 0)
941				return do_set(argc-1, argv+1);
942#endif
943		}
944		if (matches(*argv, "show") == 0 ||
945		    matches(*argv, "lst") == 0 ||
946		    matches(*argv, "list") == 0)
947			return ipaddr_list_link(argc-1, argv+1);
948		if (matches(*argv, "help") == 0)
949			usage();
950	} else
951		return ipaddr_list_link(0, NULL);
952
953	fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
954	exit(-1);
955}
956