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
35static struct
36{
37	int family;
38	int index;
39#define NONE_DEV	(-1)
40	const char *name;
41} filter;
42
43static void usage(void) __attribute__((noreturn));
44
45static 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
63static 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
313static 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
341static 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
612static void ipntable_reset_filter(void)
613{
614	memset(&filter, 0, sizeof(filter));
615}
616
617static 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
654int 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