1 /* vi: set sw=4 ts=4: */
3 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
7 * Ported to Busybox by: Curt Brune <curt@cumulusnetworks.com>
10 #include "ip_common.h" /* #include "libbb.h" is inside */
11 #include "common_bufsiz.h"
14 #include <linux/neighbour.h>
15 #include <net/if_arp.h>
17 //static int xshow_stats = 3;
18 enum { xshow_stats = 3 };
20 static inline uint32_t rta_getattr_u32(const struct rtattr *rta)
22 return *(uint32_t *)RTA_DATA(rta);
26 #define RTAX_RTTVAR RTAX_HOPS
40 struct rtnl_handle *rth;
42 typedef struct filter_t filter_t;
44 #define G_filter (*(filter_t*)bb_common_bufsiz1)
45 #define INIT_G() do { setup_common_bufsiz(); } while (0)
47 static int flush_update(void)
49 if (rtnl_send(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
50 bb_perror_msg("can't send flush request");
57 static unsigned nud_state_a2n(char *arg)
59 static const char keywords[] ALIGN1 =
60 /* "ip neigh show/flush" parameters: */
61 "permanent\0" "reachable\0" "noarp\0" "none\0"
62 "stale\0" "incomplete\0" "delay\0" "probe\0"
65 static uint8_t nuds[] ALIGN1 = {
66 NUD_PERMANENT,NUD_REACHABLE, NUD_NOARP,NUD_NONE,
67 NUD_STALE, NUD_INCOMPLETE,NUD_DELAY,NUD_PROBE,
73 (NUD_PERMANENT|NUD_REACHABLE| NUD_NOARP|NUD_NONE|
74 NUD_STALE| NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE|
78 id = index_in_substrings(keywords, arg);
80 bb_error_msg_and_die(bb_msg_invalid_arg_to, arg, "nud state");
86 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
90 static int FAST_FUNC print_neigh(const struct sockaddr_nl *who UNUSED_PARAM,
91 struct nlmsghdr *n, void *arg UNUSED_PARAM)
93 struct ndmsg *r = NLMSG_DATA(n);
94 int len = n->nlmsg_len;
95 struct rtattr *tb[NDA_MAX+1];
97 if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
98 bb_error_msg_and_die("not RTM_NEWNEIGH: %08x %08x %08x",
99 n->nlmsg_len, n->nlmsg_type,
102 len -= NLMSG_LENGTH(sizeof(*r));
104 bb_error_msg_and_die("BUG: wrong nlmsg len %d", len);
107 if (G_filter.flushb && n->nlmsg_type != RTM_NEWNEIGH)
110 if (G_filter.family && G_filter.family != r->ndm_family)
112 if (G_filter.index && G_filter.index != r->ndm_ifindex)
114 if (!(G_filter.state&r->ndm_state) &&
115 !(r->ndm_flags & NTF_PROXY) &&
116 (r->ndm_state || !(G_filter.state & 0x100)) &&
117 (r->ndm_family != AF_DECnet))
120 parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
123 if (G_filter.pfx.family) {
125 memset(&dst, 0, sizeof(dst));
126 dst.family = r->ndm_family;
127 memcpy(&dst.data, RTA_DATA(tb[NDA_DST]), RTA_PAYLOAD(tb[NDA_DST]));
128 if (inet_addr_match(&dst, &G_filter.pfx, G_filter.pfx.bitlen))
132 if (G_filter.unused_only && tb[NDA_CACHEINFO]) {
133 struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
138 if (G_filter.flushb) {
140 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
144 fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
145 memcpy(fn, n, n->nlmsg_len);
146 fn->nlmsg_type = RTM_DELNEIGH;
147 fn->nlmsg_flags = NLM_F_REQUEST;
148 fn->nlmsg_seq = ++(G_filter.rth->seq);
149 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
157 format_host(r->ndm_family,
158 RTA_PAYLOAD(tb[NDA_DST]),
159 RTA_DATA(tb[NDA_DST]))
162 if (!G_filter.index && r->ndm_ifindex)
163 printf("dev %s ", ll_index_to_name(r->ndm_ifindex));
164 if (tb[NDA_LLADDR]) {
166 printf("lladdr %s", ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
167 RTA_PAYLOAD(tb[NDA_LLADDR]),
171 if (r->ndm_flags & NTF_ROUTER) {
174 if (r->ndm_flags & NTF_PROXY) {
177 if (tb[NDA_CACHEINFO] && xshow_stats) {
178 struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
182 printf(" ref %d", ci->ndm_refcnt);
183 printf(" used %d/%d/%d", ci->ndm_used/hz,
184 ci->ndm_confirmed/hz, ci->ndm_updated/hz);
187 if (tb[NDA_PROBES] && xshow_stats) {
188 uint32_t p = rta_getattr_u32(tb[NDA_PROBES]);
189 printf(" probes %u", p);
192 /*if (r->ndm_state)*/ {
193 int nud = r->ndm_state;
195 #define PRINT_FLAG(f) \
196 if (nud & NUD_##f) { \
200 PRINT_FLAG(INCOMPLETE);
201 PRINT_FLAG(REACHABLE);
207 PRINT_FLAG(PERMANENT);
215 static void ipneigh_reset_filter(void)
217 memset(&G_filter, 0, sizeof(G_filter));
221 #define MAX_ROUNDS 10
222 /* Return value becomes exitcode. It's okay to not return at all */
223 static int FAST_FUNC ipneigh_list_or_flush(char **argv, int flush)
225 static const char keywords[] ALIGN1 =
226 /* "ip neigh show/flush" parameters: */
227 "to\0" "dev\0" "nud\0";
229 KW_to, KW_dev, KW_nud,
231 struct rtnl_handle rth;
232 struct ndmsg ndm = { 0 };
233 char *filter_dev = NULL;
237 ipneigh_reset_filter();
240 bb_error_msg_and_die(bb_msg_requires_arg, "\"ip neigh flush\"");
242 if (!G_filter.family)
243 G_filter.family = preferred_family;
245 G_filter.state = (flush) ?
246 ~(NUD_PERMANENT|NUD_NOARP) : 0xFF & ~NUD_NOARP;
249 arg = index_in_substrings(keywords, *argv);
253 } else if (arg == KW_nud) {
260 if (strcmp(*argv, "all") == 0) {
265 state = nud_state_a2n(*argv);
269 G_filter.state |= state;
274 get_prefix(&G_filter.pfx, *argv, G_filter.family);
275 if (G_filter.family == AF_UNSPEC)
276 G_filter.family = G_filter.pfx.family;
285 G_filter.index = xll_name_to_index(filter_dev);
286 if (G_filter.index == 0) {
287 bb_error_msg_and_die("can't find device '%s'", filter_dev);
293 char flushb[4096-512];
294 G_filter.flushb = flushb;
296 G_filter.flushe = sizeof(flushb);
297 G_filter.state &= ~NUD_FAILED;
300 while (round < MAX_ROUNDS) {
301 if (xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETNEIGH) < 0) {
302 bb_perror_msg_and_die("can't send dump request");
304 G_filter.flushed = 0;
305 if (xrtnl_dump_filter(&rth, print_neigh, NULL) < 0) {
306 bb_perror_msg_and_die("flush terminated");
308 if (G_filter.flushed == 0) {
310 puts("Nothing to flush");
312 printf("*** Flush is complete after %d round(s) ***\n", round);
316 if (flush_update() < 0)
318 printf("\n*** Round %d, deleting %d entries ***\n", round, G_filter.flushed);
320 bb_error_msg_and_die("*** Flush not complete bailing out after %d rounds", MAX_ROUNDS);
323 ndm.ndm_family = G_filter.family;
325 if (rtnl_dump_request(&rth, RTM_GETNEIGH, &ndm, sizeof(struct ndmsg)) < 0) {
326 bb_perror_msg_and_die("can't send dump request");
329 if (xrtnl_dump_filter(&rth, print_neigh, NULL) < 0) {
330 bb_error_msg_and_die("dump terminated");
336 /* Return value becomes exitcode. It's okay to not return at all */
337 int FAST_FUNC do_ipneigh(char **argv)
339 static const char ip_neigh_commands[] ALIGN1 =
340 /*0-1*/ "show\0" "flush\0";
346 return ipneigh_list_or_flush(argv, 0);
348 command_num = index_in_substrings(ip_neigh_commands, *argv);
349 switch (command_num) {
351 return ipneigh_list_or_flush(argv + 1, 0);
353 return ipneigh_list_or_flush(argv + 1, 1);
355 invarg_1_to_2(*argv, applet_name);