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9#include "ip_common.h"
10#include "common_bufsiz.h"
11#include "rt_names.h"
12#include "utils.h"
13#include <linux/neighbour.h>
14#include <net/if_arp.h>
15
16
17enum { xshow_stats = 3 };
18
19static inline uint32_t rta_getattr_u32(const struct rtattr *rta)
20{
21 return *(uint32_t *)RTA_DATA(rta);
22}
23
24#ifndef RTAX_RTTVAR
25#define RTAX_RTTVAR RTAX_HOPS
26#endif
27
28
29struct filter_t {
30 int family;
31 int index;
32 int state;
33 int unused_only;
34 inet_prefix pfx;
35
36
37 int flushed;
38
39 char *flushb;
40 int flushp;
41 int flushe;
42 struct rtnl_handle *rth;
43} FIX_ALIASING;
44typedef struct filter_t filter_t;
45
46#define G_filter (*(filter_t*)bb_common_bufsiz1)
47#define INIT_G() do { setup_common_bufsiz(); } while (0)
48
49static int flush_update(void)
50{
51 if (rtnl_send_check(G_filter.rth, G_filter.flushb, G_filter.flushp) < 0) {
52 bb_simple_perror_msg("can't send flush request");
53 return -1;
54 }
55 G_filter.flushp = 0;
56 return 0;
57}
58
59static unsigned nud_state_a2n(char *arg)
60{
61 static const char keywords[] ALIGN1 =
62
63 "permanent\0" "reachable\0" "noarp\0" "none\0"
64 "stale\0" "incomplete\0" "delay\0" "probe\0"
65 "failed\0"
66 ;
67 static uint8_t nuds[] ALIGN1 = {
68 NUD_PERMANENT,NUD_REACHABLE, NUD_NOARP,NUD_NONE,
69 NUD_STALE, NUD_INCOMPLETE,NUD_DELAY,NUD_PROBE,
70 NUD_FAILED
71 };
72 int id;
73
74 BUILD_BUG_ON(
75 (NUD_PERMANENT|NUD_REACHABLE| NUD_NOARP|NUD_NONE|
76 NUD_STALE| NUD_INCOMPLETE|NUD_DELAY|NUD_PROBE|
77 NUD_FAILED) > 0xff
78 );
79
80 id = index_in_substrings(keywords, arg);
81 if (id < 0)
82 bb_error_msg_and_die(bb_msg_invalid_arg_to, arg, "nud state");
83 return nuds[id];
84}
85
86#ifndef NDA_RTA
87#define NDA_RTA(r) \
88 ((struct rtattr*)(((char*)(r)) + NLMSG_ALIGN(sizeof(struct ndmsg))))
89#endif
90
91
92static int FAST_FUNC print_neigh(const struct sockaddr_nl *who UNUSED_PARAM,
93 struct nlmsghdr *n, void *arg UNUSED_PARAM)
94{
95 struct ndmsg *r = NLMSG_DATA(n);
96 int len = n->nlmsg_len;
97 struct rtattr *tb[NDA_MAX+1];
98
99 if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) {
100 bb_error_msg_and_die("not RTM_NEWNEIGH: %08x %08x %08x",
101 n->nlmsg_len, n->nlmsg_type,
102 n->nlmsg_flags);
103 }
104 len -= NLMSG_LENGTH(sizeof(*r));
105 if (len < 0) {
106 bb_error_msg_and_die("BUG: wrong nlmsg len %d", len);
107 }
108
109 if (G_filter.flushb && n->nlmsg_type != RTM_NEWNEIGH)
110 return 0;
111
112 if (G_filter.family && G_filter.family != r->ndm_family)
113 return 0;
114 if (G_filter.index && G_filter.index != r->ndm_ifindex)
115 return 0;
116 if (!(G_filter.state&r->ndm_state)
117 && !(r->ndm_flags & NTF_PROXY)
118 && (r->ndm_state || !(G_filter.state & 0x100))
119 && (r->ndm_family != AF_DECnet)
120 ) {
121 return 0;
122 }
123
124 parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
125
126 if (tb[NDA_DST]) {
127 if (G_filter.pfx.family) {
128 inet_prefix dst;
129 memset(&dst, 0, sizeof(dst));
130 dst.family = r->ndm_family;
131 memcpy(&dst.data, RTA_DATA(tb[NDA_DST]), RTA_PAYLOAD(tb[NDA_DST]));
132 if (inet_addr_match(&dst, &G_filter.pfx, G_filter.pfx.bitlen))
133 return 0;
134 }
135 }
136 if (G_filter.unused_only && tb[NDA_CACHEINFO]) {
137 struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
138 if (ci->ndm_refcnt)
139 return 0;
140 }
141
142 if (G_filter.flushb) {
143 struct nlmsghdr *fn;
144 if (NLMSG_ALIGN(G_filter.flushp) + n->nlmsg_len > G_filter.flushe) {
145 if (flush_update())
146 return -1;
147 }
148 fn = (struct nlmsghdr*)(G_filter.flushb + NLMSG_ALIGN(G_filter.flushp));
149 memcpy(fn, n, n->nlmsg_len);
150 fn->nlmsg_type = RTM_DELNEIGH;
151 fn->nlmsg_flags = NLM_F_REQUEST;
152 fn->nlmsg_seq = ++(G_filter.rth->seq);
153 G_filter.flushp = (((char*)fn) + n->nlmsg_len) - G_filter.flushb;
154 G_filter.flushed++;
155 if (xshow_stats < 2)
156 return 0;
157 }
158
159 if (tb[NDA_DST]) {
160 printf("%s ",
161 format_host(r->ndm_family,
162 RTA_PAYLOAD(tb[NDA_DST]),
163 RTA_DATA(tb[NDA_DST]))
164 );
165 }
166 if (!G_filter.index && r->ndm_ifindex)
167 printf("dev %s ", ll_index_to_name(r->ndm_ifindex));
168 if (tb[NDA_LLADDR]) {
169 SPRINT_BUF(b1);
170 printf("lladdr %s", ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]),
171 RTA_PAYLOAD(tb[NDA_LLADDR]),
172 ARPHRD_ETHER,
173 b1, sizeof(b1)));
174 }
175 if (r->ndm_flags & NTF_ROUTER) {
176 printf(" router");
177 }
178 if (r->ndm_flags & NTF_PROXY) {
179 printf(" proxy");
180 }
181 if (tb[NDA_CACHEINFO] && xshow_stats) {
182 struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]);
183 int hz = get_hz();
184
185 if (ci->ndm_refcnt)
186 printf(" ref %d", ci->ndm_refcnt);
187 printf(" used %d/%d/%d", ci->ndm_used/hz,
188 ci->ndm_confirmed/hz, ci->ndm_updated/hz);
189 }
190
191 if (tb[NDA_PROBES] && xshow_stats) {
192 uint32_t p = rta_getattr_u32(tb[NDA_PROBES]);
193 printf(" probes %u", p);
194 }
195
196 {
197 int nud = r->ndm_state;
198 char c = ' ';
199#define PRINT_FLAG(f) \
200 if (nud & NUD_##f) { \
201 printf("%c"#f, c); \
202 c = ','; \
203 }
204 PRINT_FLAG(INCOMPLETE);
205 PRINT_FLAG(REACHABLE);
206 PRINT_FLAG(STALE);
207 PRINT_FLAG(DELAY);
208 PRINT_FLAG(PROBE);
209 PRINT_FLAG(FAILED);
210 PRINT_FLAG(NOARP);
211 PRINT_FLAG(PERMANENT);
212#undef PRINT_FLAG
213 }
214 bb_putchar('\n');
215
216 return 0;
217}
218
219static void ipneigh_reset_filter(void)
220{
221 memset(&G_filter, 0, sizeof(G_filter));
222 G_filter.state = ~0;
223}
224
225#define MAX_ROUNDS 10
226
227static int FAST_FUNC ipneigh_list_or_flush(char **argv, int flush)
228{
229 static const char keywords[] ALIGN1 =
230
231 "to\0" "dev\0" "nud\0";
232 enum {
233 KW_to, KW_dev, KW_nud,
234 };
235 struct rtnl_handle rth;
236 struct ndmsg ndm = { 0 };
237 char *filter_dev = NULL;
238 int state_given = 0;
239 int arg;
240
241 ipneigh_reset_filter();
242
243 if (flush && !*argv)
244 bb_error_msg_and_die(bb_msg_requires_arg, "\"ip neigh flush\"");
245
246 if (!G_filter.family)
247 G_filter.family = preferred_family;
248
249 G_filter.state = (flush) ?
250 ~(NUD_PERMANENT|NUD_NOARP) : 0xFF & ~NUD_NOARP;
251
252 while (*argv) {
253 arg = index_in_substrings(keywords, *argv);
254 if (arg == KW_dev) {
255 NEXT_ARG();
256 filter_dev = *argv;
257 } else if (arg == KW_nud) {
258 unsigned state;
259 NEXT_ARG();
260 if (!state_given) {
261 state_given = 1;
262 G_filter.state = 0;
263 }
264 if (strcmp(*argv, "all") == 0) {
265 state = ~0;
266 if (flush)
267 state &= ~NUD_NOARP;
268 } else {
269 state = nud_state_a2n(*argv);
270 }
271 if (state == 0)
272 state = 0x100;
273 G_filter.state |= state;
274 } else {
275 if (arg == KW_to) {
276 NEXT_ARG();
277 }
278 get_prefix(&G_filter.pfx, *argv, G_filter.family);
279 if (G_filter.family == AF_UNSPEC)
280 G_filter.family = G_filter.pfx.family;
281 }
282 argv++;
283 }
284
285 xrtnl_open(&rth);
286 ll_init_map(&rth);
287
288 if (filter_dev) {
289 G_filter.index = xll_name_to_index(filter_dev);
290 if (G_filter.index == 0) {
291 bb_error_msg_and_die("can't find device '%s'", filter_dev);
292 }
293 }
294
295 if (flush) {
296 int round = 0;
297 char flushb[4096-512];
298 G_filter.flushb = flushb;
299 G_filter.flushp = 0;
300 G_filter.flushe = sizeof(flushb);
301 G_filter.state &= ~NUD_FAILED;
302 G_filter.rth = &rth;
303
304 while (round < MAX_ROUNDS) {
305 xrtnl_wilddump_request(&rth, G_filter.family, RTM_GETNEIGH);
306 G_filter.flushed = 0;
307 if (xrtnl_dump_filter(&rth, print_neigh, NULL) < 0) {
308 bb_simple_perror_msg_and_die("flush terminated");
309 }
310 if (G_filter.flushed == 0) {
311 if (round == 0)
312 puts("Nothing to flush");
313 else
314 printf("*** Flush is complete after %d round(s) ***\n", round);
315 return 0;
316 }
317 round++;
318 if (flush_update() < 0)
319 xfunc_die();
320 printf("\n*** Round %d, deleting %d entries ***\n", round, G_filter.flushed);
321 }
322 bb_error_msg_and_die("*** Flush not complete bailing out after %d rounds", MAX_ROUNDS);
323 }
324
325 ndm.ndm_family = G_filter.family;
326
327 if (rtnl_dump_request(&rth, RTM_GETNEIGH, &ndm, sizeof(struct ndmsg)) < 0) {
328 bb_simple_perror_msg_and_die("can't send dump request");
329 }
330
331 if (xrtnl_dump_filter(&rth, print_neigh, NULL) < 0) {
332 bb_simple_error_msg_and_die("dump terminated");
333 }
334
335 return 0;
336}
337
338
339int FAST_FUNC do_ipneigh(char **argv)
340{
341 static const char ip_neigh_commands[] ALIGN1 =
342 "show\0" "flush\0";
343 int command_num;
344
345 INIT_G();
346
347 if (!*argv)
348 return ipneigh_list_or_flush(argv, 0);
349
350 command_num = index_in_substrings(ip_neigh_commands, *argv);
351 switch (command_num) {
352 case 0:
353 return ipneigh_list_or_flush(argv + 1, 0);
354 case 1:
355 return ipneigh_list_or_flush(argv + 1, 1);
356 }
357 invarg_1_to_2(*argv, applet_name);
358 return 1;
359}
360
