1 /*
2 * Copyright (C)2006 USAGI/WIDE Project
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, see <http://www.gnu.org/licenses>.
16 */
17 /*
18 * based on ipneigh.c
19 */
20 /*
21 * Authors:
22 * Masahide NAKAMURA @USAGI
23 */
24
25 #include <stdio.h>
26 #include <stdlib.h>
27 #include <string.h>
28 #include <sys/time.h>
29 #include <sys/socket.h>
30 #include <time.h>
31
32 #include "utils.h"
33 #include "ip_common.h"
34
35 static struct
36 {
37 int family;
38 int index;
39 #define NONE_DEV (-1)
40 const char *name;
41 } filter;
42
43 static void usage(void) __attribute__((noreturn));
44
usage(void)45 static void usage(void)
46 {
47 fprintf(stderr,
48 "Usage: ip ntable change name NAME [ dev DEV ]\n"
49 " [ thresh1 VAL ] [ thresh2 VAL ] [ thresh3 VAL ] [ gc_int MSEC ]\n"
50 " [ PARMS ]\n"
51 "Usage: ip ntable show [ dev DEV ] [ name NAME ]\n"
52
53 "PARMS := [ base_reachable MSEC ] [ retrans MSEC ] [ gc_stale MSEC ]\n"
54 " [ delay_probe MSEC ] [ queue LEN ]\n"
55 " [ app_probes VAL ] [ ucast_probes VAL ] [ mcast_probes VAL ]\n"
56 " [ anycast_delay MSEC ] [ proxy_delay MSEC ] [ proxy_queue LEN ]\n"
57 " [ locktime MSEC ]\n"
58 );
59
60 exit(-1);
61 }
62
ipntable_modify(int cmd,int flags,int argc,char ** argv)63 static int ipntable_modify(int cmd, int flags, int argc, char **argv)
64 {
65 struct {
66 struct nlmsghdr n;
67 struct ndtmsg ndtm;
68 char buf[1024];
69 } req = {
70 .n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndtmsg)),
71 .n.nlmsg_flags = NLM_F_REQUEST | flags,
72 .n.nlmsg_type = cmd,
73 .ndtm.ndtm_family = preferred_family,
74 };
75 char *namep = NULL;
76 char *threshsp = NULL;
77 char *gc_intp = NULL;
78 char parms_buf[1024] = {};
79 struct rtattr *parms_rta = (struct rtattr *)parms_buf;
80 int parms_change = 0;
81
82 parms_rta->rta_type = NDTA_PARMS;
83 parms_rta->rta_len = RTA_LENGTH(0);
84
85 while (argc > 0) {
86 if (strcmp(*argv, "name") == 0) {
87 int len;
88
89 NEXT_ARG();
90 if (namep)
91 duparg("NAME", *argv);
92
93 namep = *argv;
94 len = strlen(namep) + 1;
95 addattr_l(&req.n, sizeof(req), NDTA_NAME, namep, len);
96 } else if (strcmp(*argv, "thresh1") == 0) {
97 __u32 thresh1;
98
99 NEXT_ARG();
100 threshsp = *argv;
101
102 if (get_u32(&thresh1, *argv, 0))
103 invarg("\"thresh1\" value is invalid", *argv);
104
105 addattr32(&req.n, sizeof(req), NDTA_THRESH1, thresh1);
106 } else if (strcmp(*argv, "thresh2") == 0) {
107 __u32 thresh2;
108
109 NEXT_ARG();
110 threshsp = *argv;
111
112 if (get_u32(&thresh2, *argv, 0))
113 invarg("\"thresh2\" value is invalid", *argv);
114
115 addattr32(&req.n, sizeof(req), NDTA_THRESH2, thresh2);
116 } else if (strcmp(*argv, "thresh3") == 0) {
117 __u32 thresh3;
118
119 NEXT_ARG();
120 threshsp = *argv;
121
122 if (get_u32(&thresh3, *argv, 0))
123 invarg("\"thresh3\" value is invalid", *argv);
124
125 addattr32(&req.n, sizeof(req), NDTA_THRESH3, thresh3);
126 } else if (strcmp(*argv, "gc_int") == 0) {
127 __u64 gc_int;
128
129 NEXT_ARG();
130 gc_intp = *argv;
131
132 if (get_u64(&gc_int, *argv, 0))
133 invarg("\"gc_int\" value is invalid", *argv);
134
135 addattr_l(&req.n, sizeof(req), NDTA_GC_INTERVAL,
136 &gc_int, sizeof(gc_int));
137 } else if (strcmp(*argv, "dev") == 0) {
138 __u32 ifindex;
139
140 NEXT_ARG();
141 ifindex = ll_name_to_index(*argv);
142 if (ifindex == 0) {
143 fprintf(stderr, "Cannot find device \"%s\"\n", *argv);
144 return -1;
145 }
146
147 rta_addattr32(parms_rta, sizeof(parms_buf),
148 NDTPA_IFINDEX, ifindex);
149 } else if (strcmp(*argv, "base_reachable") == 0) {
150 __u64 breachable;
151
152 NEXT_ARG();
153
154 if (get_u64(&breachable, *argv, 0))
155 invarg("\"base_reachable\" value is invalid", *argv);
156
157 rta_addattr_l(parms_rta, sizeof(parms_buf),
158 NDTPA_BASE_REACHABLE_TIME,
159 &breachable, sizeof(breachable));
160 parms_change = 1;
161 } else if (strcmp(*argv, "retrans") == 0) {
162 __u64 retrans;
163
164 NEXT_ARG();
165
166 if (get_u64(&retrans, *argv, 0))
167 invarg("\"retrans\" value is invalid", *argv);
168
169 rta_addattr_l(parms_rta, sizeof(parms_buf),
170 NDTPA_RETRANS_TIME,
171 &retrans, sizeof(retrans));
172 parms_change = 1;
173 } else if (strcmp(*argv, "gc_stale") == 0) {
174 __u64 gc_stale;
175
176 NEXT_ARG();
177
178 if (get_u64(&gc_stale, *argv, 0))
179 invarg("\"gc_stale\" value is invalid", *argv);
180
181 rta_addattr_l(parms_rta, sizeof(parms_buf),
182 NDTPA_GC_STALETIME,
183 &gc_stale, sizeof(gc_stale));
184 parms_change = 1;
185 } else if (strcmp(*argv, "delay_probe") == 0) {
186 __u64 delay_probe;
187
188 NEXT_ARG();
189
190 if (get_u64(&delay_probe, *argv, 0))
191 invarg("\"delay_probe\" value is invalid", *argv);
192
193 rta_addattr_l(parms_rta, sizeof(parms_buf),
194 NDTPA_DELAY_PROBE_TIME,
195 &delay_probe, sizeof(delay_probe));
196 parms_change = 1;
197 } else if (strcmp(*argv, "queue") == 0) {
198 __u32 queue;
199
200 NEXT_ARG();
201
202 if (get_u32(&queue, *argv, 0))
203 invarg("\"queue\" value is invalid", *argv);
204
205 rta_addattr32(parms_rta, sizeof(parms_buf),
206 NDTPA_QUEUE_LEN, queue);
207 parms_change = 1;
208 } else if (strcmp(*argv, "app_probes") == 0) {
209 __u32 aprobe;
210
211 NEXT_ARG();
212
213 if (get_u32(&aprobe, *argv, 0))
214 invarg("\"app_probes\" value is invalid", *argv);
215
216 rta_addattr32(parms_rta, sizeof(parms_buf),
217 NDTPA_APP_PROBES, aprobe);
218 parms_change = 1;
219 } else if (strcmp(*argv, "ucast_probes") == 0) {
220 __u32 uprobe;
221
222 NEXT_ARG();
223
224 if (get_u32(&uprobe, *argv, 0))
225 invarg("\"ucast_probes\" value is invalid", *argv);
226
227 rta_addattr32(parms_rta, sizeof(parms_buf),
228 NDTPA_UCAST_PROBES, uprobe);
229 parms_change = 1;
230 } else if (strcmp(*argv, "mcast_probes") == 0) {
231 __u32 mprobe;
232
233 NEXT_ARG();
234
235 if (get_u32(&mprobe, *argv, 0))
236 invarg("\"mcast_probes\" value is invalid", *argv);
237
238 rta_addattr32(parms_rta, sizeof(parms_buf),
239 NDTPA_MCAST_PROBES, mprobe);
240 parms_change = 1;
241 } else if (strcmp(*argv, "anycast_delay") == 0) {
242 __u64 anycast_delay;
243
244 NEXT_ARG();
245
246 if (get_u64(&anycast_delay, *argv, 0))
247 invarg("\"anycast_delay\" value is invalid", *argv);
248
249 rta_addattr_l(parms_rta, sizeof(parms_buf),
250 NDTPA_ANYCAST_DELAY,
251 &anycast_delay, sizeof(anycast_delay));
252 parms_change = 1;
253 } else if (strcmp(*argv, "proxy_delay") == 0) {
254 __u64 proxy_delay;
255
256 NEXT_ARG();
257
258 if (get_u64(&proxy_delay, *argv, 0))
259 invarg("\"proxy_delay\" value is invalid", *argv);
260
261 rta_addattr_l(parms_rta, sizeof(parms_buf),
262 NDTPA_PROXY_DELAY,
263 &proxy_delay, sizeof(proxy_delay));
264 parms_change = 1;
265 } else if (strcmp(*argv, "proxy_queue") == 0) {
266 __u32 pqueue;
267
268 NEXT_ARG();
269
270 if (get_u32(&pqueue, *argv, 0))
271 invarg("\"proxy_queue\" value is invalid", *argv);
272
273 rta_addattr32(parms_rta, sizeof(parms_buf),
274 NDTPA_PROXY_QLEN, pqueue);
275 parms_change = 1;
276 } else if (strcmp(*argv, "locktime") == 0) {
277 __u64 locktime;
278
279 NEXT_ARG();
280
281 if (get_u64(&locktime, *argv, 0))
282 invarg("\"locktime\" value is invalid", *argv);
283
284 rta_addattr_l(parms_rta, sizeof(parms_buf),
285 NDTPA_LOCKTIME,
286 &locktime, sizeof(locktime));
287 parms_change = 1;
288 } else {
289 invarg("unknown", *argv);
290 }
291
292 argc--; argv++;
293 }
294
295 if (!namep)
296 missarg("NAME");
297 if (!threshsp && !gc_intp && !parms_change) {
298 fprintf(stderr, "Not enough information: changeable attributes required.\n");
299 exit(-1);
300 }
301
302 if (parms_rta->rta_len > RTA_LENGTH(0)) {
303 addattr_l(&req.n, sizeof(req), NDTA_PARMS, RTA_DATA(parms_rta),
304 RTA_PAYLOAD(parms_rta));
305 }
306
307 if (rtnl_talk(&rth, &req.n, NULL, 0) < 0)
308 exit(2);
309
310 return 0;
311 }
312
ntable_strtime_delta(__u32 msec)313 static const char *ntable_strtime_delta(__u32 msec)
314 {
315 static char str[32];
316 struct timeval now = {};
317 time_t t;
318 struct tm *tp;
319
320 if (msec == 0)
321 goto error;
322
323 if (gettimeofday(&now, NULL) < 0) {
324 perror("gettimeofday");
325 goto error;
326 }
327
328 t = now.tv_sec - (msec / 1000);
329 tp = localtime(&t);
330 if (!tp)
331 goto error;
332
333 strftime(str, sizeof(str), "%Y-%m-%d %T", tp);
334
335 return str;
336 error:
337 strcpy(str, "(error)");
338 return str;
339 }
340
print_ntable(const struct sockaddr_nl * who,struct nlmsghdr * n,void * arg)341 static int print_ntable(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
342 {
343 FILE *fp = (FILE *)arg;
344 struct ndtmsg *ndtm = NLMSG_DATA(n);
345 int len = n->nlmsg_len;
346 struct rtattr *tb[NDTA_MAX+1];
347 struct rtattr *tpb[NDTPA_MAX+1];
348 int ret;
349
350 if (n->nlmsg_type != RTM_NEWNEIGHTBL) {
351 fprintf(stderr, "Not NEIGHTBL: %08x %08x %08x\n",
352 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
353 return 0;
354 }
355 len -= NLMSG_LENGTH(sizeof(*ndtm));
356 if (len < 0) {
357 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
358 return -1;
359 }
360
361 if (preferred_family && preferred_family != ndtm->ndtm_family)
362 return 0;
363
364 parse_rtattr(tb, NDTA_MAX, NDTA_RTA(ndtm),
365 n->nlmsg_len - NLMSG_LENGTH(sizeof(*ndtm)));
366
367 if (tb[NDTA_NAME]) {
368 const char *name = rta_getattr_str(tb[NDTA_NAME]);
369
370 if (filter.name && strcmp(filter.name, name))
371 return 0;
372 }
373 if (tb[NDTA_PARMS]) {
374 parse_rtattr(tpb, NDTPA_MAX, RTA_DATA(tb[NDTA_PARMS]),
375 RTA_PAYLOAD(tb[NDTA_PARMS]));
376
377 if (tpb[NDTPA_IFINDEX]) {
378 __u32 ifindex = rta_getattr_u32(tpb[NDTPA_IFINDEX]);
379
380 if (filter.index && filter.index != ifindex)
381 return 0;
382 } else {
383 if (filter.index && filter.index != NONE_DEV)
384 return 0;
385 }
386 }
387
388 if (ndtm->ndtm_family == AF_INET)
389 fprintf(fp, "inet ");
390 else if (ndtm->ndtm_family == AF_INET6)
391 fprintf(fp, "inet6 ");
392 else if (ndtm->ndtm_family == AF_DECnet)
393 fprintf(fp, "dnet ");
394 else
395 fprintf(fp, "(%d) ", ndtm->ndtm_family);
396
397 if (tb[NDTA_NAME]) {
398 const char *name = rta_getattr_str(tb[NDTA_NAME]);
399
400 fprintf(fp, "%s ", name);
401 }
402
403 fprintf(fp, "%s", _SL_);
404
405 ret = (tb[NDTA_THRESH1] || tb[NDTA_THRESH2] || tb[NDTA_THRESH3] ||
406 tb[NDTA_GC_INTERVAL]);
407 if (ret)
408 fprintf(fp, " ");
409
410 if (tb[NDTA_THRESH1]) {
411 __u32 thresh1 = rta_getattr_u32(tb[NDTA_THRESH1]);
412
413 fprintf(fp, "thresh1 %u ", thresh1);
414 }
415 if (tb[NDTA_THRESH2]) {
416 __u32 thresh2 = rta_getattr_u32(tb[NDTA_THRESH2]);
417
418 fprintf(fp, "thresh2 %u ", thresh2);
419 }
420 if (tb[NDTA_THRESH3]) {
421 __u32 thresh3 = rta_getattr_u32(tb[NDTA_THRESH3]);
422
423 fprintf(fp, "thresh3 %u ", thresh3);
424 }
425 if (tb[NDTA_GC_INTERVAL]) {
426 unsigned long long gc_int = rta_getattr_u64(tb[NDTA_GC_INTERVAL]);
427
428 fprintf(fp, "gc_int %llu ", gc_int);
429 }
430
431 if (ret)
432 fprintf(fp, "%s", _SL_);
433
434 if (tb[NDTA_CONFIG] && show_stats) {
435 struct ndt_config *ndtc = RTA_DATA(tb[NDTA_CONFIG]);
436
437 fprintf(fp, " ");
438 fprintf(fp, "config ");
439
440 fprintf(fp, "key_len %u ", ndtc->ndtc_key_len);
441 fprintf(fp, "entry_size %u ", ndtc->ndtc_entry_size);
442 fprintf(fp, "entries %u ", ndtc->ndtc_entries);
443
444 fprintf(fp, "%s", _SL_);
445 fprintf(fp, " ");
446
447 fprintf(fp, "last_flush %s ",
448 ntable_strtime_delta(ndtc->ndtc_last_flush));
449 fprintf(fp, "last_rand %s ",
450 ntable_strtime_delta(ndtc->ndtc_last_rand));
451
452 fprintf(fp, "%s", _SL_);
453 fprintf(fp, " ");
454
455 fprintf(fp, "hash_rnd %u ", ndtc->ndtc_hash_rnd);
456 fprintf(fp, "hash_mask %08x ", ndtc->ndtc_hash_mask);
457
458 fprintf(fp, "hash_chain_gc %u ", ndtc->ndtc_hash_chain_gc);
459 fprintf(fp, "proxy_qlen %u ", ndtc->ndtc_proxy_qlen);
460
461 fprintf(fp, "%s", _SL_);
462 }
463
464 if (tb[NDTA_PARMS]) {
465 if (tpb[NDTPA_IFINDEX]) {
466 __u32 ifindex = rta_getattr_u32(tpb[NDTPA_IFINDEX]);
467
468 fprintf(fp, " ");
469 fprintf(fp, "dev %s ", ll_index_to_name(ifindex));
470 fprintf(fp, "%s", _SL_);
471 }
472
473 fprintf(fp, " ");
474
475 if (tpb[NDTPA_REFCNT]) {
476 __u32 refcnt = rta_getattr_u32(tpb[NDTPA_REFCNT]);
477
478 fprintf(fp, "refcnt %u ", refcnt);
479 }
480 if (tpb[NDTPA_REACHABLE_TIME]) {
481 unsigned long long reachable = rta_getattr_u64(tpb[NDTPA_REACHABLE_TIME]);
482
483 fprintf(fp, "reachable %llu ", reachable);
484 }
485 if (tpb[NDTPA_BASE_REACHABLE_TIME]) {
486 unsigned long long breachable = rta_getattr_u64(tpb[NDTPA_BASE_REACHABLE_TIME]);
487
488 fprintf(fp, "base_reachable %llu ", breachable);
489 }
490 if (tpb[NDTPA_RETRANS_TIME]) {
491 unsigned long long retrans = rta_getattr_u64(tpb[NDTPA_RETRANS_TIME]);
492
493 fprintf(fp, "retrans %llu ", retrans);
494 }
495
496 fprintf(fp, "%s", _SL_);
497
498 fprintf(fp, " ");
499
500 if (tpb[NDTPA_GC_STALETIME]) {
501 unsigned long long gc_stale = rta_getattr_u64(tpb[NDTPA_GC_STALETIME]);
502
503 fprintf(fp, "gc_stale %llu ", gc_stale);
504 }
505 if (tpb[NDTPA_DELAY_PROBE_TIME]) {
506 unsigned long long delay_probe = rta_getattr_u64(tpb[NDTPA_DELAY_PROBE_TIME]);
507
508 fprintf(fp, "delay_probe %llu ", delay_probe);
509 }
510 if (tpb[NDTPA_QUEUE_LEN]) {
511 __u32 queue = rta_getattr_u32(tpb[NDTPA_QUEUE_LEN]);
512
513 fprintf(fp, "queue %u ", queue);
514 }
515
516 fprintf(fp, "%s", _SL_);
517
518 fprintf(fp, " ");
519
520 if (tpb[NDTPA_APP_PROBES]) {
521 __u32 aprobe = rta_getattr_u32(tpb[NDTPA_APP_PROBES]);
522
523 fprintf(fp, "app_probes %u ", aprobe);
524 }
525 if (tpb[NDTPA_UCAST_PROBES]) {
526 __u32 uprobe = rta_getattr_u32(tpb[NDTPA_UCAST_PROBES]);
527
528 fprintf(fp, "ucast_probes %u ", uprobe);
529 }
530 if (tpb[NDTPA_MCAST_PROBES]) {
531 __u32 mprobe = rta_getattr_u32(tpb[NDTPA_MCAST_PROBES]);
532
533 fprintf(fp, "mcast_probes %u ", mprobe);
534 }
535
536 fprintf(fp, "%s", _SL_);
537
538 fprintf(fp, " ");
539
540 if (tpb[NDTPA_ANYCAST_DELAY]) {
541 unsigned long long anycast_delay = rta_getattr_u64(tpb[NDTPA_ANYCAST_DELAY]);
542
543 fprintf(fp, "anycast_delay %llu ", anycast_delay);
544 }
545 if (tpb[NDTPA_PROXY_DELAY]) {
546 unsigned long long proxy_delay = rta_getattr_u64(tpb[NDTPA_PROXY_DELAY]);
547
548 fprintf(fp, "proxy_delay %llu ", proxy_delay);
549 }
550 if (tpb[NDTPA_PROXY_QLEN]) {
551 __u32 pqueue = rta_getattr_u32(tpb[NDTPA_PROXY_QLEN]);
552
553 fprintf(fp, "proxy_queue %u ", pqueue);
554 }
555 if (tpb[NDTPA_LOCKTIME]) {
556 unsigned long long locktime = rta_getattr_u64(tpb[NDTPA_LOCKTIME]);
557
558 fprintf(fp, "locktime %llu ", locktime);
559 }
560
561 fprintf(fp, "%s", _SL_);
562 }
563
564 if (tb[NDTA_STATS] && show_stats) {
565 struct ndt_stats *ndts = RTA_DATA(tb[NDTA_STATS]);
566
567 fprintf(fp, " ");
568 fprintf(fp, "stats ");
569
570 fprintf(fp, "allocs %llu ",
571 (unsigned long long) ndts->ndts_allocs);
572 fprintf(fp, "destroys %llu ",
573 (unsigned long long) ndts->ndts_destroys);
574 fprintf(fp, "hash_grows %llu ",
575 (unsigned long long) ndts->ndts_hash_grows);
576
577 fprintf(fp, "%s", _SL_);
578 fprintf(fp, " ");
579
580 fprintf(fp, "res_failed %llu ",
581 (unsigned long long) ndts->ndts_res_failed);
582 fprintf(fp, "lookups %llu ",
583 (unsigned long long) ndts->ndts_lookups);
584 fprintf(fp, "hits %llu ",
585 (unsigned long long) ndts->ndts_hits);
586
587 fprintf(fp, "%s", _SL_);
588 fprintf(fp, " ");
589
590 fprintf(fp, "rcv_probes_mcast %llu ",
591 (unsigned long long) ndts->ndts_rcv_probes_mcast);
592 fprintf(fp, "rcv_probes_ucast %llu ",
593 (unsigned long long) ndts->ndts_rcv_probes_ucast);
594
595 fprintf(fp, "%s", _SL_);
596 fprintf(fp, " ");
597
598 fprintf(fp, "periodic_gc_runs %llu ",
599 (unsigned long long) ndts->ndts_periodic_gc_runs);
600 fprintf(fp, "forced_gc_runs %llu ",
601 (unsigned long long) ndts->ndts_forced_gc_runs);
602
603 fprintf(fp, "%s", _SL_);
604 }
605
606 fprintf(fp, "\n");
607
608 fflush(fp);
609 return 0;
610 }
611
ipntable_reset_filter(void)612 static void ipntable_reset_filter(void)
613 {
614 memset(&filter, 0, sizeof(filter));
615 }
616
ipntable_show(int argc,char ** argv)617 static int ipntable_show(int argc, char **argv)
618 {
619 ipntable_reset_filter();
620
621 filter.family = preferred_family;
622
623 while (argc > 0) {
624 if (strcmp(*argv, "dev") == 0) {
625 NEXT_ARG();
626
627 if (strcmp("none", *argv) == 0)
628 filter.index = NONE_DEV;
629 else if ((filter.index = ll_name_to_index(*argv)) == 0)
630 invarg("\"DEV\" is invalid", *argv);
631 } else if (strcmp(*argv, "name") == 0) {
632 NEXT_ARG();
633
634 filter.name = *argv;
635 } else
636 invarg("unknown", *argv);
637
638 argc--; argv++;
639 }
640
641 if (rtnl_wilddump_request(&rth, preferred_family, RTM_GETNEIGHTBL) < 0) {
642 perror("Cannot send dump request");
643 exit(1);
644 }
645
646 if (rtnl_dump_filter(&rth, print_ntable, stdout) < 0) {
647 fprintf(stderr, "Dump terminated\n");
648 exit(1);
649 }
650
651 return 0;
652 }
653
do_ipntable(int argc,char ** argv)654 int do_ipntable(int argc, char **argv)
655 {
656 ll_init_map(&rth);
657
658 if (argc > 0) {
659 if (matches(*argv, "change") == 0 ||
660 matches(*argv, "chg") == 0)
661 return ipntable_modify(RTM_SETNEIGHTBL,
662 NLM_F_REPLACE,
663 argc-1, argv+1);
664 if (matches(*argv, "show") == 0 ||
665 matches(*argv, "lst") == 0 ||
666 matches(*argv, "list") == 0)
667 return ipntable_show(argc-1, argv+1);
668 if (matches(*argv, "help") == 0)
669 usage();
670 } else
671 return ipntable_show(0, NULL);
672
673 fprintf(stderr, "Command \"%s\" is unknown, try \"ip ntable help\".\n", *argv);
674 exit(-1);
675 }
676