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
40 static void usage(void) __attribute__((noreturn));
41 static int iplink_have_newlink(void);
42
iplink_usage(void)43 void 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
usage(void)89 static void usage(void)
90 {
91 iplink_usage();
92 }
93
on_off(char * msg)94 static 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
100 static void *BODY; /* cached dlopen(NULL) handle */
101 static struct link_util *linkutil_list;
102
get_link_kind(const char * id)103 struct 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
get_link_mode(const char * mode)135 int get_link_mode(const char *mode)
136 {
137 if (strcasecmp(mode, "default") == 0)
138 return IF_LINK_MODE_DEFAULT;
139 if (strcasecmp(mode, "dormant") == 0)
140 return IF_LINK_MODE_DORMANT;
141 return -1;
142 }
143
144 #if IPLINK_IOCTL_COMPAT
145 static int have_rtnl_newlink = -1;
146
accept_msg(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)147 static int accept_msg(const struct sockaddr_nl *who,
148 struct nlmsghdr *n, void *arg)
149 {
150 struct nlmsgerr *err = (struct nlmsgerr *)NLMSG_DATA(n);
151
152 if (n->nlmsg_type == NLMSG_ERROR &&
153 (err->error == -EOPNOTSUPP || err->error == -EINVAL))
154 have_rtnl_newlink = 0;
155 else
156 have_rtnl_newlink = 1;
157 return -1;
158 }
159
iplink_have_newlink(void)160 static int iplink_have_newlink(void)
161 {
162 struct {
163 struct nlmsghdr n;
164 struct ifinfomsg i;
165 char buf[1024];
166 } req;
167
168 if (have_rtnl_newlink < 0) {
169 memset(&req, 0, sizeof(req));
170
171 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
172 req.n.nlmsg_flags = NLM_F_REQUEST|NLM_F_ACK;
173 req.n.nlmsg_type = RTM_NEWLINK;
174 req.i.ifi_family = AF_UNSPEC;
175
176 rtnl_send(&rth, &req.n, req.n.nlmsg_len);
177 rtnl_listen(&rth, accept_msg, NULL);
178 }
179 return have_rtnl_newlink;
180 }
181 #else /* IPLINK_IOCTL_COMPAT */
iplink_have_newlink(void)182 static int iplink_have_newlink(void)
183 {
184 return 1;
185 }
186 #endif /* ! IPLINK_IOCTL_COMPAT */
187
188 struct iplink_req {
189 struct nlmsghdr n;
190 struct ifinfomsg i;
191 char buf[1024];
192 };
193
iplink_parse_vf(int vf,int * argcp,char *** argvp,struct iplink_req * req)194 int iplink_parse_vf(int vf, int *argcp, char ***argvp,
195 struct iplink_req *req)
196 {
197 int len, argc = *argcp;
198 char **argv = *argvp;
199 struct rtattr *vfinfo;
200
201 vfinfo = addattr_nest(&req->n, sizeof(*req), IFLA_VF_INFO);
202
203 while (NEXT_ARG_OK()) {
204 NEXT_ARG();
205 if (matches(*argv, "mac") == 0) {
206 struct ifla_vf_mac ivm;
207 NEXT_ARG();
208 ivm.vf = vf;
209 len = ll_addr_a2n((char *)ivm.mac, 32, *argv);
210 if (len < 0)
211 return -1;
212 addattr_l(&req->n, sizeof(*req), IFLA_VF_MAC, &ivm, sizeof(ivm));
213 } else if (matches(*argv, "vlan") == 0) {
214 struct ifla_vf_vlan ivv;
215 NEXT_ARG();
216 if (get_unsigned(&ivv.vlan, *argv, 0)) {
217 invarg("Invalid \"vlan\" value\n", *argv);
218 }
219 ivv.vf = vf;
220 ivv.qos = 0;
221 if (NEXT_ARG_OK()) {
222 NEXT_ARG();
223 if (matches(*argv, "qos") == 0) {
224 NEXT_ARG();
225 if (get_unsigned(&ivv.qos, *argv, 0)) {
226 invarg("Invalid \"qos\" value\n", *argv);
227 }
228 } else {
229 /* rewind arg */
230 PREV_ARG();
231 }
232 }
233 addattr_l(&req->n, sizeof(*req), IFLA_VF_VLAN, &ivv, sizeof(ivv));
234 } else if (matches(*argv, "rate") == 0) {
235 struct ifla_vf_tx_rate ivt;
236 NEXT_ARG();
237 if (get_unsigned(&ivt.rate, *argv, 0)) {
238 invarg("Invalid \"rate\" value\n", *argv);
239 }
240 ivt.vf = vf;
241 addattr_l(&req->n, sizeof(*req), IFLA_VF_TX_RATE, &ivt, sizeof(ivt));
242
243 } else if (matches(*argv, "spoofchk") == 0) {
244 struct ifla_vf_spoofchk ivs;
245 NEXT_ARG();
246 if (matches(*argv, "on") == 0)
247 ivs.setting = 1;
248 else if (matches(*argv, "off") == 0)
249 ivs.setting = 0;
250 else
251 invarg("Invalid \"spoofchk\" value\n", *argv);
252 ivs.vf = vf;
253 addattr_l(&req->n, sizeof(*req), IFLA_VF_SPOOFCHK, &ivs, sizeof(ivs));
254
255 } else {
256 /* rewind arg */
257 PREV_ARG();
258 break;
259 }
260 }
261
262 if (argc == *argcp)
263 incomplete_command();
264
265 addattr_nest_end(&req->n, vfinfo);
266
267 *argcp = argc;
268 *argvp = argv;
269 return 0;
270 }
271
272
iplink_parse(int argc,char ** argv,struct iplink_req * req,char ** name,char ** type,char ** link,char ** dev,int * group)273 int iplink_parse(int argc, char **argv, struct iplink_req *req,
274 char **name, char **type, char **link, char **dev, int *group)
275 {
276 int ret, len;
277 char abuf[32];
278 int qlen = -1;
279 int mtu = -1;
280 int netns = -1;
281 int vf = -1;
282
283 *group = -1;
284 ret = argc;
285
286 while (argc > 0) {
287 if (strcmp(*argv, "up") == 0) {
288 req->i.ifi_change |= IFF_UP;
289 req->i.ifi_flags |= IFF_UP;
290 } else if (strcmp(*argv, "down") == 0) {
291 req->i.ifi_change |= IFF_UP;
292 req->i.ifi_flags &= ~IFF_UP;
293 } else if (strcmp(*argv, "name") == 0) {
294 NEXT_ARG();
295 *name = *argv;
296 } else if (matches(*argv, "link") == 0) {
297 NEXT_ARG();
298 *link = *argv;
299 } else if (matches(*argv, "address") == 0) {
300 NEXT_ARG();
301 len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
302 if (len < 0)
303 return -1;
304 addattr_l(&req->n, sizeof(*req), IFLA_ADDRESS, abuf, len);
305 } else if (matches(*argv, "broadcast") == 0 ||
306 strcmp(*argv, "brd") == 0) {
307 NEXT_ARG();
308 len = ll_addr_a2n(abuf, sizeof(abuf), *argv);
309 if (len < 0)
310 return -1;
311 addattr_l(&req->n, sizeof(*req), IFLA_BROADCAST, abuf, len);
312 } else if (matches(*argv, "txqueuelen") == 0 ||
313 strcmp(*argv, "qlen") == 0 ||
314 matches(*argv, "txqlen") == 0) {
315 NEXT_ARG();
316 if (qlen != -1)
317 duparg("txqueuelen", *argv);
318 if (get_integer(&qlen, *argv, 0))
319 invarg("Invalid \"txqueuelen\" value\n", *argv);
320 addattr_l(&req->n, sizeof(*req), IFLA_TXQLEN, &qlen, 4);
321 } else if (strcmp(*argv, "mtu") == 0) {
322 NEXT_ARG();
323 if (mtu != -1)
324 duparg("mtu", *argv);
325 if (get_integer(&mtu, *argv, 0))
326 invarg("Invalid \"mtu\" value\n", *argv);
327 addattr_l(&req->n, sizeof(*req), IFLA_MTU, &mtu, 4);
328 } else if (strcmp(*argv, "netns") == 0) {
329 NEXT_ARG();
330 if (netns != -1)
331 duparg("netns", *argv);
332 if ((netns = get_netns_fd(*argv)) >= 0)
333 addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_FD, &netns, 4);
334 else if (get_integer(&netns, *argv, 0) == 0)
335 addattr_l(&req->n, sizeof(*req), IFLA_NET_NS_PID, &netns, 4);
336 else
337 invarg("Invalid \"netns\" value\n", *argv);
338 } else if (strcmp(*argv, "multicast") == 0) {
339 NEXT_ARG();
340 req->i.ifi_change |= IFF_MULTICAST;
341 if (strcmp(*argv, "on") == 0) {
342 req->i.ifi_flags |= IFF_MULTICAST;
343 } else if (strcmp(*argv, "off") == 0) {
344 req->i.ifi_flags &= ~IFF_MULTICAST;
345 } else
346 return on_off("multicast");
347 } else if (strcmp(*argv, "allmulticast") == 0) {
348 NEXT_ARG();
349 req->i.ifi_change |= IFF_ALLMULTI;
350 if (strcmp(*argv, "on") == 0) {
351 req->i.ifi_flags |= IFF_ALLMULTI;
352 } else if (strcmp(*argv, "off") == 0) {
353 req->i.ifi_flags &= ~IFF_ALLMULTI;
354 } else
355 return on_off("allmulticast");
356 } else if (strcmp(*argv, "promisc") == 0) {
357 NEXT_ARG();
358 req->i.ifi_change |= IFF_PROMISC;
359 if (strcmp(*argv, "on") == 0) {
360 req->i.ifi_flags |= IFF_PROMISC;
361 } else if (strcmp(*argv, "off") == 0) {
362 req->i.ifi_flags &= ~IFF_PROMISC;
363 } else
364 return on_off("promisc");
365 } else if (strcmp(*argv, "trailers") == 0) {
366 NEXT_ARG();
367 req->i.ifi_change |= IFF_NOTRAILERS;
368 if (strcmp(*argv, "off") == 0) {
369 req->i.ifi_flags |= IFF_NOTRAILERS;
370 } else if (strcmp(*argv, "on") == 0) {
371 req->i.ifi_flags &= ~IFF_NOTRAILERS;
372 } else
373 return on_off("trailers");
374 } else if (strcmp(*argv, "arp") == 0) {
375 NEXT_ARG();
376 req->i.ifi_change |= IFF_NOARP;
377 if (strcmp(*argv, "on") == 0) {
378 req->i.ifi_flags &= ~IFF_NOARP;
379 } else if (strcmp(*argv, "off") == 0) {
380 req->i.ifi_flags |= IFF_NOARP;
381 } else
382 return on_off("noarp");
383 } else if (strcmp(*argv, "vf") == 0) {
384 struct rtattr *vflist;
385 NEXT_ARG();
386 if (get_integer(&vf, *argv, 0)) {
387 invarg("Invalid \"vf\" value\n", *argv);
388 }
389 vflist = addattr_nest(&req->n, sizeof(*req),
390 IFLA_VFINFO_LIST);
391 len = iplink_parse_vf(vf, &argc, &argv, req);
392 if (len < 0)
393 return -1;
394 addattr_nest_end(&req->n, vflist);
395 } else if (matches(*argv, "master") == 0) {
396 int ifindex;
397 NEXT_ARG();
398 ifindex = ll_name_to_index(*argv);
399 if (!ifindex)
400 invarg("Device does not exist\n", *argv);
401 addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
402 &ifindex, 4);
403 } else if (matches(*argv, "nomaster") == 0) {
404 int ifindex = 0;
405 addattr_l(&req->n, sizeof(*req), IFLA_MASTER,
406 &ifindex, 4);
407 } else if (matches(*argv, "dynamic") == 0) {
408 NEXT_ARG();
409 req->i.ifi_change |= IFF_DYNAMIC;
410 if (strcmp(*argv, "on") == 0) {
411 req->i.ifi_flags |= IFF_DYNAMIC;
412 } else if (strcmp(*argv, "off") == 0) {
413 req->i.ifi_flags &= ~IFF_DYNAMIC;
414 } else
415 return on_off("dynamic");
416 } else if (matches(*argv, "type") == 0) {
417 NEXT_ARG();
418 *type = *argv;
419 argc--; argv++;
420 break;
421 } else if (matches(*argv, "alias") == 0) {
422 NEXT_ARG();
423 addattr_l(&req->n, sizeof(*req), IFLA_IFALIAS,
424 *argv, strlen(*argv));
425 argc--; argv++;
426 break;
427 } else if (strcmp(*argv, "group") == 0) {
428 NEXT_ARG();
429 if (*group != -1)
430 duparg("group", *argv);
431 if (rtnl_group_a2n(group, *argv))
432 invarg("Invalid \"group\" value\n", *argv);
433 } else if (strcmp(*argv, "mode") == 0) {
434 int mode;
435 NEXT_ARG();
436 mode = get_link_mode(*argv);
437 if (mode < 0)
438 invarg("Invalid link mode\n", *argv);
439 addattr8(&req->n, sizeof(*req), IFLA_LINKMODE, mode);
440 } else if (strcmp(*argv, "state") == 0) {
441 int state;
442 NEXT_ARG();
443 state = get_operstate(*argv);
444 if (state < 0)
445 invarg("Invalid operstate\n", *argv);
446
447 addattr8(&req->n, sizeof(*req), IFLA_OPERSTATE, state);
448 } else {
449 if (strcmp(*argv, "dev") == 0) {
450 NEXT_ARG();
451 }
452 if (matches(*argv, "help") == 0)
453 usage();
454 if (*dev)
455 duparg2("dev", *argv);
456 *dev = *argv;
457 }
458 argc--; argv++;
459 }
460
461 return ret - argc;
462 }
463
iplink_modify(int cmd,unsigned int flags,int argc,char ** argv)464 static int iplink_modify(int cmd, unsigned int flags, int argc, char **argv)
465 {
466 int len;
467 char *dev = NULL;
468 char *name = NULL;
469 char *link = NULL;
470 char *type = NULL;
471 int group;
472 struct link_util *lu = NULL;
473 struct iplink_req req;
474 int ret;
475
476 memset(&req, 0, sizeof(req));
477
478 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
479 req.n.nlmsg_flags = NLM_F_REQUEST|flags;
480 req.n.nlmsg_type = cmd;
481 req.i.ifi_family = preferred_family;
482
483 ret = iplink_parse(argc, argv, &req, &name, &type, &link, &dev, &group);
484 if (ret < 0)
485 return ret;
486
487 argc -= ret;
488 argv += ret;
489
490 if (group != -1) {
491 if (dev)
492 addattr_l(&req.n, sizeof(req), IFLA_GROUP,
493 &group, sizeof(group));
494 else {
495 if (argc) {
496 fprintf(stderr, "Garbage instead of arguments "
497 "\"%s ...\". Try \"ip link "
498 "help\".\n", *argv);
499 return -1;
500 }
501 if (flags & NLM_F_CREATE) {
502 fprintf(stderr, "group cannot be used when "
503 "creating devices.\n");
504 return -1;
505 }
506
507 req.i.ifi_index = 0;
508 addattr32(&req.n, sizeof(req), IFLA_GROUP, group);
509 if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
510 exit(2);
511 return 0;
512 }
513 }
514
515 ll_init_map(&rth);
516
517 if (!(flags & NLM_F_CREATE)) {
518 if (!dev) {
519 fprintf(stderr, "Not enough information: \"dev\" "
520 "argument is required.\n");
521 exit(-1);
522 }
523
524 req.i.ifi_index = ll_name_to_index(dev);
525 if (req.i.ifi_index == 0) {
526 fprintf(stderr, "Cannot find device \"%s\"\n", dev);
527 return -1;
528 }
529 } else {
530 /* Allow "ip link add dev" and "ip link add name" */
531 if (!name)
532 name = dev;
533
534 if (link) {
535 int ifindex;
536
537 ifindex = ll_name_to_index(link);
538 if (ifindex == 0) {
539 fprintf(stderr, "Cannot find device \"%s\"\n",
540 link);
541 return -1;
542 }
543 addattr_l(&req.n, sizeof(req), IFLA_LINK, &ifindex, 4);
544 }
545 }
546
547 if (name) {
548 len = strlen(name) + 1;
549 if (len == 1)
550 invarg("\"\" is not a valid device identifier\n", "name");
551 if (len > IFNAMSIZ)
552 invarg("\"name\" too long\n", name);
553 addattr_l(&req.n, sizeof(req), IFLA_IFNAME, name, len);
554 }
555
556 if (type) {
557 struct rtattr *linkinfo = NLMSG_TAIL(&req.n);
558 addattr_l(&req.n, sizeof(req), IFLA_LINKINFO, NULL, 0);
559 addattr_l(&req.n, sizeof(req), IFLA_INFO_KIND, type,
560 strlen(type));
561
562 lu = get_link_kind(type);
563 if (lu && argc) {
564 struct rtattr * data = NLMSG_TAIL(&req.n);
565 addattr_l(&req.n, sizeof(req), IFLA_INFO_DATA, NULL, 0);
566
567 if (lu->parse_opt &&
568 lu->parse_opt(lu, argc, argv, &req.n))
569 return -1;
570
571 data->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)data;
572 } else if (argc) {
573 if (matches(*argv, "help") == 0)
574 usage();
575 fprintf(stderr, "Garbage instead of arguments \"%s ...\". "
576 "Try \"ip link help\".\n", *argv);
577 return -1;
578 }
579 linkinfo->rta_len = (void *)NLMSG_TAIL(&req.n) - (void *)linkinfo;
580 } else if (flags & NLM_F_CREATE) {
581 fprintf(stderr, "Not enough information: \"type\" argument "
582 "is required\n");
583 return -1;
584 }
585
586 if (rtnl_talk(&rth, &req.n, 0, 0, NULL) < 0)
587 exit(2);
588
589 return 0;
590 }
591
592 #if IPLINK_IOCTL_COMPAT
get_ctl_fd(void)593 static int get_ctl_fd(void)
594 {
595 int s_errno;
596 int fd;
597
598 fd = socket(PF_INET, SOCK_DGRAM, 0);
599 if (fd >= 0)
600 return fd;
601 s_errno = errno;
602 fd = socket(PF_PACKET, SOCK_DGRAM, 0);
603 if (fd >= 0)
604 return fd;
605 fd = socket(PF_INET6, SOCK_DGRAM, 0);
606 if (fd >= 0)
607 return fd;
608 errno = s_errno;
609 perror("Cannot create control socket");
610 return -1;
611 }
612
do_chflags(const char * dev,__u32 flags,__u32 mask)613 static int do_chflags(const char *dev, __u32 flags, __u32 mask)
614 {
615 struct ifreq ifr;
616 int fd;
617 int err;
618
619 strncpy(ifr.ifr_name, dev, IFNAMSIZ);
620 fd = get_ctl_fd();
621 if (fd < 0)
622 return -1;
623 err = ioctl(fd, SIOCGIFFLAGS, &ifr);
624 if (err) {
625 perror("SIOCGIFFLAGS");
626 close(fd);
627 return -1;
628 }
629 if ((ifr.ifr_flags^flags)&mask) {
630 ifr.ifr_flags &= ~mask;
631 ifr.ifr_flags |= mask&flags;
632 err = ioctl(fd, SIOCSIFFLAGS, &ifr);
633 if (err)
634 perror("SIOCSIFFLAGS");
635 }
636 close(fd);
637 return err;
638 }
639
do_changename(const char * dev,const char * newdev)640 static int do_changename(const char *dev, const char *newdev)
641 {
642 struct ifreq ifr;
643 int fd;
644 int err;
645
646 strncpy(ifr.ifr_name, dev, IFNAMSIZ);
647 strncpy(ifr.ifr_newname, newdev, IFNAMSIZ);
648 fd = get_ctl_fd();
649 if (fd < 0)
650 return -1;
651 err = ioctl(fd, SIOCSIFNAME, &ifr);
652 if (err) {
653 perror("SIOCSIFNAME");
654 close(fd);
655 return -1;
656 }
657 close(fd);
658 return err;
659 }
660
set_qlen(const char * dev,int qlen)661 static int set_qlen(const char *dev, int qlen)
662 {
663 struct ifreq ifr;
664 int s;
665
666 s = get_ctl_fd();
667 if (s < 0)
668 return -1;
669
670 memset(&ifr, 0, sizeof(ifr));
671 strncpy(ifr.ifr_name, dev, IFNAMSIZ);
672 ifr.ifr_qlen = qlen;
673 if (ioctl(s, SIOCSIFTXQLEN, &ifr) < 0) {
674 perror("SIOCSIFXQLEN");
675 close(s);
676 return -1;
677 }
678 close(s);
679
680 return 0;
681 }
682
set_mtu(const char * dev,int mtu)683 static int set_mtu(const char *dev, int mtu)
684 {
685 struct ifreq ifr;
686 int s;
687
688 s = get_ctl_fd();
689 if (s < 0)
690 return -1;
691
692 memset(&ifr, 0, sizeof(ifr));
693 strncpy(ifr.ifr_name, dev, IFNAMSIZ);
694 ifr.ifr_mtu = mtu;
695 if (ioctl(s, SIOCSIFMTU, &ifr) < 0) {
696 perror("SIOCSIFMTU");
697 close(s);
698 return -1;
699 }
700 close(s);
701
702 return 0;
703 }
704
get_address(const char * dev,int * htype)705 static int get_address(const char *dev, int *htype)
706 {
707 struct ifreq ifr;
708 struct sockaddr_ll me;
709 socklen_t alen;
710 int s;
711
712 s = socket(PF_PACKET, SOCK_DGRAM, 0);
713 if (s < 0) {
714 perror("socket(PF_PACKET)");
715 return -1;
716 }
717
718 memset(&ifr, 0, sizeof(ifr));
719 strncpy(ifr.ifr_name, dev, IFNAMSIZ);
720 if (ioctl(s, SIOCGIFINDEX, &ifr) < 0) {
721 perror("SIOCGIFINDEX");
722 close(s);
723 return -1;
724 }
725
726 memset(&me, 0, sizeof(me));
727 me.sll_family = AF_PACKET;
728 me.sll_ifindex = ifr.ifr_ifindex;
729 me.sll_protocol = htons(ETH_P_LOOP);
730 if (bind(s, (struct sockaddr*)&me, sizeof(me)) == -1) {
731 perror("bind");
732 close(s);
733 return -1;
734 }
735
736 alen = sizeof(me);
737 if (getsockname(s, (struct sockaddr*)&me, &alen) == -1) {
738 perror("getsockname");
739 close(s);
740 return -1;
741 }
742 close(s);
743 *htype = me.sll_hatype;
744 return me.sll_halen;
745 }
746
parse_address(const char * dev,int hatype,int halen,char * lla,struct ifreq * ifr)747 static int parse_address(const char *dev, int hatype, int halen,
748 char *lla, struct ifreq *ifr)
749 {
750 int alen;
751
752 memset(ifr, 0, sizeof(*ifr));
753 strncpy(ifr->ifr_name, dev, IFNAMSIZ);
754 ifr->ifr_hwaddr.sa_family = hatype;
755 alen = ll_addr_a2n(ifr->ifr_hwaddr.sa_data, 14, lla);
756 if (alen < 0)
757 return -1;
758 if (alen != halen) {
759 fprintf(stderr, "Wrong address (%s) length: expected %d bytes\n", lla, halen);
760 return -1;
761 }
762 return 0;
763 }
764
set_address(struct ifreq * ifr,int brd)765 static int set_address(struct ifreq *ifr, int brd)
766 {
767 int s;
768
769 s = get_ctl_fd();
770 if (s < 0)
771 return -1;
772 if (ioctl(s, brd?SIOCSIFHWBROADCAST:SIOCSIFHWADDR, ifr) < 0) {
773 perror(brd?"SIOCSIFHWBROADCAST":"SIOCSIFHWADDR");
774 close(s);
775 return -1;
776 }
777 close(s);
778 return 0;
779 }
780
781
do_set(int argc,char ** argv)782 static int do_set(int argc, char **argv)
783 {
784 char *dev = NULL;
785 __u32 mask = 0;
786 __u32 flags = 0;
787 int qlen = -1;
788 int mtu = -1;
789 char *newaddr = NULL;
790 char *newbrd = NULL;
791 struct ifreq ifr0, ifr1;
792 char *newname = NULL;
793 int htype, halen;
794
795 while (argc > 0) {
796 if (strcmp(*argv, "up") == 0) {
797 mask |= IFF_UP;
798 flags |= IFF_UP;
799 } else if (strcmp(*argv, "down") == 0) {
800 mask |= IFF_UP;
801 flags &= ~IFF_UP;
802 } else if (strcmp(*argv, "name") == 0) {
803 NEXT_ARG();
804 newname = *argv;
805 } else if (matches(*argv, "address") == 0) {
806 NEXT_ARG();
807 newaddr = *argv;
808 } else if (matches(*argv, "broadcast") == 0 ||
809 strcmp(*argv, "brd") == 0) {
810 NEXT_ARG();
811 newbrd = *argv;
812 } else if (matches(*argv, "txqueuelen") == 0 ||
813 strcmp(*argv, "qlen") == 0 ||
814 matches(*argv, "txqlen") == 0) {
815 NEXT_ARG();
816 if (qlen != -1)
817 duparg("txqueuelen", *argv);
818 if (get_integer(&qlen, *argv, 0))
819 invarg("Invalid \"txqueuelen\" value\n", *argv);
820 } else if (strcmp(*argv, "mtu") == 0) {
821 NEXT_ARG();
822 if (mtu != -1)
823 duparg("mtu", *argv);
824 if (get_integer(&mtu, *argv, 0))
825 invarg("Invalid \"mtu\" value\n", *argv);
826 } else if (strcmp(*argv, "multicast") == 0) {
827 NEXT_ARG();
828 mask |= IFF_MULTICAST;
829 if (strcmp(*argv, "on") == 0) {
830 flags |= IFF_MULTICAST;
831 } else if (strcmp(*argv, "off") == 0) {
832 flags &= ~IFF_MULTICAST;
833 } else
834 return on_off("multicast");
835 } else if (strcmp(*argv, "allmulticast") == 0) {
836 NEXT_ARG();
837 mask |= IFF_ALLMULTI;
838 if (strcmp(*argv, "on") == 0) {
839 flags |= IFF_ALLMULTI;
840 } else if (strcmp(*argv, "off") == 0) {
841 flags &= ~IFF_ALLMULTI;
842 } else
843 return on_off("allmulticast");
844 } else if (strcmp(*argv, "promisc") == 0) {
845 NEXT_ARG();
846 mask |= IFF_PROMISC;
847 if (strcmp(*argv, "on") == 0) {
848 flags |= IFF_PROMISC;
849 } else if (strcmp(*argv, "off") == 0) {
850 flags &= ~IFF_PROMISC;
851 } else
852 return on_off("promisc");
853 } else if (strcmp(*argv, "trailers") == 0) {
854 NEXT_ARG();
855 mask |= IFF_NOTRAILERS;
856 if (strcmp(*argv, "off") == 0) {
857 flags |= IFF_NOTRAILERS;
858 } else if (strcmp(*argv, "on") == 0) {
859 flags &= ~IFF_NOTRAILERS;
860 } else
861 return on_off("trailers");
862 } else if (strcmp(*argv, "arp") == 0) {
863 NEXT_ARG();
864 mask |= IFF_NOARP;
865 if (strcmp(*argv, "on") == 0) {
866 flags &= ~IFF_NOARP;
867 } else if (strcmp(*argv, "off") == 0) {
868 flags |= IFF_NOARP;
869 } else
870 return on_off("noarp");
871 } else if (matches(*argv, "dynamic") == 0) {
872 NEXT_ARG();
873 mask |= IFF_DYNAMIC;
874 if (strcmp(*argv, "on") == 0) {
875 flags |= IFF_DYNAMIC;
876 } else if (strcmp(*argv, "off") == 0) {
877 flags &= ~IFF_DYNAMIC;
878 } else
879 return on_off("dynamic");
880 } else {
881 if (strcmp(*argv, "dev") == 0) {
882 NEXT_ARG();
883 }
884 if (matches(*argv, "help") == 0)
885 usage();
886 if (dev)
887 duparg2("dev", *argv);
888 dev = *argv;
889 }
890 argc--; argv++;
891 }
892
893 if (!dev) {
894 fprintf(stderr, "Not enough of information: \"dev\" argument is required.\n");
895 exit(-1);
896 }
897
898 if (newaddr || newbrd) {
899 halen = get_address(dev, &htype);
900 if (halen < 0)
901 return -1;
902 if (newaddr) {
903 if (parse_address(dev, htype, halen, newaddr, &ifr0) < 0)
904 return -1;
905 }
906 if (newbrd) {
907 if (parse_address(dev, htype, halen, newbrd, &ifr1) < 0)
908 return -1;
909 }
910 }
911
912 if (newname && strcmp(dev, newname)) {
913 if (strlen(newname) == 0)
914 invarg("\"\" is not a valid device identifier\n", "name");
915 if (do_changename(dev, newname) < 0)
916 return -1;
917 dev = newname;
918 }
919 if (qlen != -1) {
920 if (set_qlen(dev, qlen) < 0)
921 return -1;
922 }
923 if (mtu != -1) {
924 if (set_mtu(dev, mtu) < 0)
925 return -1;
926 }
927 if (newaddr || newbrd) {
928 if (newbrd) {
929 if (set_address(&ifr1, 1) < 0)
930 return -1;
931 }
932 if (newaddr) {
933 if (set_address(&ifr0, 0) < 0)
934 return -1;
935 }
936 }
937 if (mask)
938 return do_chflags(dev, flags, mask);
939 return 0;
940 }
941 #endif /* IPLINK_IOCTL_COMPAT */
942
do_iplink(int argc,char ** argv)943 int do_iplink(int argc, char **argv)
944 {
945 if (argc > 0) {
946 if (iplink_have_newlink()) {
947 if (matches(*argv, "add") == 0)
948 return iplink_modify(RTM_NEWLINK,
949 NLM_F_CREATE|NLM_F_EXCL,
950 argc-1, argv+1);
951 if (matches(*argv, "set") == 0 ||
952 matches(*argv, "change") == 0)
953 return iplink_modify(RTM_NEWLINK, 0,
954 argc-1, argv+1);
955 if (matches(*argv, "replace") == 0)
956 return iplink_modify(RTM_NEWLINK,
957 NLM_F_CREATE|NLM_F_REPLACE,
958 argc-1, argv+1);
959 if (matches(*argv, "delete") == 0)
960 return iplink_modify(RTM_DELLINK, 0,
961 argc-1, argv+1);
962 } else {
963 #if IPLINK_IOCTL_COMPAT
964 if (matches(*argv, "set") == 0)
965 return do_set(argc-1, argv+1);
966 #endif
967 }
968 if (matches(*argv, "show") == 0 ||
969 matches(*argv, "lst") == 0 ||
970 matches(*argv, "list") == 0)
971 return ipaddr_list_link(argc-1, argv+1);
972 if (matches(*argv, "help") == 0)
973 usage();
974 } else
975 return ipaddr_list_link(0, NULL);
976
977 fprintf(stderr, "Command \"%s\" is unknown, try \"ip link help\".\n", *argv);
978 exit(-1);
979 }
980