2 * ipneigh.c "ip neigh".
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.
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
14 * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <netinet/ip.h>
30 #include "ip_common.h"
32 #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY)
48 static void usage(void) __attribute__((noreturn));
50 static void usage(void)
52 fprintf(stderr, "Usage: ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ]\n"
53 " [ nud { permanent | noarp | stale | reachable } ]\n"
54 " | proxy ADDR } [ dev DEV ]\n");
55 fprintf(stderr, " ip neigh {show|flush} [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n");
59 int nud_state_a2n(unsigned *state, char *arg)
61 if (matches(arg, "permanent") == 0)
62 *state = NUD_PERMANENT;
63 else if (matches(arg, "reachable") == 0)
64 *state = NUD_REACHABLE;
65 else if (strcmp(arg, "noarp") == 0)
67 else if (strcmp(arg, "none") == 0)
69 else if (strcmp(arg, "stale") == 0)
71 else if (strcmp(arg, "incomplete") == 0)
72 *state = NUD_INCOMPLETE;
73 else if (strcmp(arg, "delay") == 0)
75 else if (strcmp(arg, "probe") == 0)
77 else if (matches(arg, "failed") == 0)
80 if (get_unsigned(state, arg, 0))
82 if (*state>=0x100 || (*state&((*state)-1)))
88 static int flush_update(void)
90 if (rtnl_send(&rth, filter.flushb, filter.flushp) < 0) {
91 perror("Failed to send flush request");
99 static int ipneigh_modify(int cmd, int flags, int argc, char **argv)
112 memset(&req, 0, sizeof(req));
114 req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg));
115 req.n.nlmsg_flags = NLM_F_REQUEST|flags;
116 req.n.nlmsg_type = cmd;
117 req.ndm.ndm_family = preferred_family;
118 req.ndm.ndm_state = NUD_PERMANENT;
121 if (matches(*argv, "lladdr") == 0) {
124 duparg("lladdr", *argv);
127 } else if (strcmp(*argv, "nud") == 0) {
130 if (nud_state_a2n(&state, *argv))
131 invarg("nud state is bad", *argv);
132 req.ndm.ndm_state = state;
133 } else if (matches(*argv, "proxy") == 0) {
135 if (matches(*argv, "help") == 0)
138 duparg("address", *argv);
139 get_addr(&dst, *argv, preferred_family);
141 req.ndm.ndm_flags |= NTF_PROXY;
142 } else if (strcmp(*argv, "dev") == 0) {
146 if (strcmp(*argv, "to") == 0) {
149 if (matches(*argv, "help") == 0) {
153 duparg2("to", *argv);
154 get_addr(&dst, *argv, preferred_family);
159 if (d == NULL || !dst_ok || dst.family == AF_UNSPEC) {
160 fprintf(stderr, "Device and destination are required arguments.\n");
163 req.ndm.ndm_family = dst.family;
164 addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen);
166 if (lla && strcmp(lla, "null")) {
170 l = ll_addr_a2n(llabuf, sizeof(llabuf), lla);
171 addattr_l(&req.n, sizeof(req), NDA_LLADDR, llabuf, l);
176 if ((req.ndm.ndm_ifindex = ll_name_to_index(d)) == 0) {
177 fprintf(stderr, "Cannot find device \"%s\"\n", d);
181 if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0)
188 int print_neigh(const struct sockaddr_nl *who, struct nlmsghdr *n, void *arg)
190 FILE *fp = (FILE*)arg;
191 struct ndmsg *r = NLMSG_DATA(n);
192 int len = n->nlmsg_len;
193 struct rtattr * tb[NDA_MAX+1];
196 if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
197 fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n",
198 n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags);
202 len -= NLMSG_LENGTH(sizeof(*r));
204 fprintf(stderr, "BUG: wrong nlmsg len %d\n", len);
208 if (filter.flushb && n->nlmsg_type != RTM_NEWNEIGH)
211 if (filter.family && filter.family != r->ndm_family)
213 if (filter.index && filter.index != r->ndm_ifindex)
215 if (!(filter.state&r->ndm_state) &&
216 (r->ndm_state || !(filter.state&0x100)) &&
217 (r->ndm_family != AF_DECnet))
220 parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
223 if (filter.pfx.family) {
225 memset(&dst, 0, sizeof(dst));
226 dst.family = r->ndm_family;
227 memcpy(&dst.data, RTA_DATA(tb[NDA_DST]), RTA_PAYLOAD(tb[NDA_DST]));
228 if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen))
232 if (filter.unused_only && tb[NDA_CACHEINFO]) {
233 struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
240 if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) {
244 fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp));
245 memcpy(fn, n, n->nlmsg_len);
246 fn->nlmsg_type = RTM_DELNEIGH;
247 fn->nlmsg_flags = NLM_F_REQUEST;
248 fn->nlmsg_seq = ++rth.seq;
249 filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb;
257 format_host(r->ndm_family,
258 RTA_PAYLOAD(tb[NDA_DST]),
259 RTA_DATA(tb[NDA_DST]),
260 abuf, sizeof(abuf)));
262 if (!filter.index && r->ndm_ifindex)
263 fprintf(fp, "dev %s ", ll_index_to_name(r->ndm_ifindex));
264 if (tb[NDA_LLADDR]) {
266 fprintf(fp, "lladdr %s", ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
267 RTA_PAYLOAD(tb[NDA_LLADDR]),
268 ll_index_to_type(r->ndm_ifindex),
271 if (r->ndm_flags & NTF_ROUTER) {
272 fprintf(fp, " router");
274 if (tb[NDA_CACHEINFO] && show_stats) {
276 struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
280 printf(" ref %d", ci->ndm_refcnt);
281 fprintf(fp, " used %d/%d/%d", ci->ndm_used/hz,
282 ci->ndm_confirmed/hz, ci->ndm_updated/hz);
286 if (tb[NDA_PROBES] && show_stats) {
287 __u32 p = *(__u32 *) RTA_DATA(tb[NDA_PROBES]);
288 fprintf(fp, " probes %u", p);
293 int nud = r->ndm_state;
296 #define PRINT_FLAG(f) if (nud & NUD_##f) { \
297 nud &= ~NUD_##f; fprintf(fp, #f "%s", nud ? "," : ""); }
298 PRINT_FLAG(INCOMPLETE);
299 PRINT_FLAG(REACHABLE);
305 PRINT_FLAG(PERMANENT);
314 void ipneigh_reset_filter()
316 memset(&filter, 0, sizeof(filter));
320 int do_show_or_flush(int argc, char **argv, int flush)
322 char *filter_dev = NULL;
325 ipneigh_reset_filter();
328 filter.family = preferred_family;
332 fprintf(stderr, "Flush requires arguments.\n");
335 filter.state = ~(NUD_PERMANENT|NUD_NOARP);
337 filter.state = 0xFF & ~NUD_NOARP;
340 if (strcmp(*argv, "dev") == 0) {
343 duparg("dev", *argv);
345 } else if (strcmp(*argv, "unused") == 0) {
346 filter.unused_only = 1;
347 } else if (strcmp(*argv, "nud") == 0) {
354 if (nud_state_a2n(&state, *argv)) {
355 if (strcmp(*argv, "all") != 0)
356 invarg("nud state is bad", *argv);
363 filter.state |= state;
365 if (strcmp(*argv, "to") == 0) {
368 if (matches(*argv, "help") == 0)
370 get_prefix(&filter.pfx, *argv, filter.family);
371 if (filter.family == AF_UNSPEC)
372 filter.family = filter.pfx.family;
380 if ((filter.index = ll_name_to_index(filter_dev)) == 0) {
381 fprintf(stderr, "Cannot find device \"%s\"\n", filter_dev);
388 char flushb[4096-512];
390 filter.flushb = flushb;
392 filter.flushe = sizeof(flushb);
393 filter.state &= ~NUD_FAILED;
395 while (round < MAX_ROUNDS) {
396 if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNEIGH) < 0) {
397 perror("Cannot send dump request");
401 if (rtnl_dump_filter(&rth, print_neigh, stdout, NULL, NULL) < 0) {
402 fprintf(stderr, "Flush terminated\n");
405 if (filter.flushed == 0) {
407 fprintf(stderr, "Nothing to flush.\n");
408 } else if (show_stats)
409 printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":"");
414 if (flush_update() < 0)
417 printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed);
421 printf("*** Flush not complete bailing out after %d rounds\n",
426 if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNEIGH) < 0) {
427 perror("Cannot send dump request");
431 if (rtnl_dump_filter(&rth, print_neigh, stdout, NULL, NULL) < 0) {
432 fprintf(stderr, "Dump terminated\n");
439 int do_ipneigh(int argc, char **argv)
442 if (matches(*argv, "add") == 0)
443 return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1);
444 if (matches(*argv, "change") == 0 ||
445 strcmp(*argv, "chg") == 0)
446 return ipneigh_modify(RTM_NEWNEIGH, NLM_F_REPLACE, argc-1, argv+1);
447 if (matches(*argv, "replace") == 0)
448 return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1);
449 if (matches(*argv, "delete") == 0)
450 return ipneigh_modify(RTM_DELNEIGH, 0, argc-1, argv+1);
451 if (matches(*argv, "get") == 0) {
452 fprintf(stderr, "Sorry, \"neigh get\" is not implemented :-(\n");
455 if (matches(*argv, "show") == 0 ||
456 matches(*argv, "lst") == 0 ||
457 matches(*argv, "list") == 0)
458 return do_show_or_flush(argc-1, argv+1, 0);
459 if (matches(*argv, "flush") == 0)
460 return do_show_or_flush(argc-1, argv+1, 1);
461 if (matches(*argv, "help") == 0)
464 return do_show_or_flush(0, NULL, 0);
466 fprintf(stderr, "Command \"%s\" is unknown, try \"ip neigh help\".\n", *argv);