osdl.org!shemminger | aba5acd | 2004-04-15 20:56:59 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * ipneigh.c "ip neigh". |
| 3 | * |
| 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. |
| 8 | * |
| 9 | * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> |
| 10 | * |
| 11 | * |
| 12 | * Changes: |
| 13 | * |
| 14 | * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses |
| 15 | */ |
| 16 | |
| 17 | #include <stdio.h> |
| 18 | #include <stdlib.h> |
| 19 | #include <unistd.h> |
| 20 | #include <syslog.h> |
| 21 | #include <fcntl.h> |
| 22 | #include <string.h> |
| 23 | #include <sys/time.h> |
| 24 | #include <net/if.h> |
| 25 | #include <sys/socket.h> |
| 26 | #include <netinet/in.h> |
| 27 | #include <netinet/ip.h> |
| 28 | |
| 29 | #include "rt_names.h" |
| 30 | #include "utils.h" |
| 31 | #include "ip_common.h" |
| 32 | |
| 33 | #define NUD_VALID (NUD_PERMANENT|NUD_NOARP|NUD_REACHABLE|NUD_PROBE|NUD_STALE|NUD_DELAY) |
| 34 | |
| 35 | static struct |
| 36 | { |
| 37 | int family; |
| 38 | int index; |
| 39 | int state; |
| 40 | int unused_only; |
| 41 | inet_prefix pfx; |
| 42 | int flushed; |
| 43 | char *flushb; |
| 44 | int flushp; |
| 45 | int flushe; |
| 46 | struct rtnl_handle *rth; |
| 47 | } filter; |
| 48 | |
| 49 | static void usage(void) __attribute__((noreturn)); |
| 50 | |
| 51 | static void usage(void) |
| 52 | { |
| 53 | fprintf(stderr, "Usage: ip neigh { add | del | change | replace } { ADDR [ lladdr LLADDR ]\n" |
| 54 | " [ nud { permanent | noarp | stale | reachable } ]\n" |
| 55 | " | proxy ADDR } [ dev DEV ]\n"); |
| 56 | fprintf(stderr, " ip neigh {show|flush} [ to PREFIX ] [ dev DEV ] [ nud STATE ]\n"); |
| 57 | exit(-1); |
| 58 | } |
| 59 | |
| 60 | int nud_state_a2n(unsigned *state, char *arg) |
| 61 | { |
| 62 | if (matches(arg, "permanent") == 0) |
| 63 | *state = NUD_PERMANENT; |
| 64 | else if (matches(arg, "reachable") == 0) |
| 65 | *state = NUD_REACHABLE; |
| 66 | else if (strcmp(arg, "noarp") == 0) |
| 67 | *state = NUD_NOARP; |
| 68 | else if (strcmp(arg, "none") == 0) |
| 69 | *state = NUD_NONE; |
| 70 | else if (strcmp(arg, "stale") == 0) |
| 71 | *state = NUD_STALE; |
| 72 | else if (strcmp(arg, "incomplete") == 0) |
| 73 | *state = NUD_INCOMPLETE; |
| 74 | else if (strcmp(arg, "delay") == 0) |
| 75 | *state = NUD_DELAY; |
| 76 | else if (strcmp(arg, "probe") == 0) |
| 77 | *state = NUD_PROBE; |
| 78 | else if (matches(arg, "failed") == 0) |
| 79 | *state = NUD_FAILED; |
| 80 | else { |
| 81 | if (get_unsigned(state, arg, 0)) |
| 82 | return -1; |
| 83 | if (*state>=0x100 || (*state&((*state)-1))) |
| 84 | return -1; |
| 85 | } |
| 86 | return 0; |
| 87 | } |
| 88 | |
| 89 | char * nud_state_n2a(__u8 state, char *buf, int len) |
| 90 | { |
| 91 | switch (state) { |
| 92 | case NUD_NONE: |
| 93 | return "none"; |
| 94 | case NUD_INCOMPLETE: |
| 95 | return "incomplete"; |
| 96 | case NUD_REACHABLE: |
| 97 | return "reachable"; |
| 98 | case NUD_STALE: |
| 99 | return "stale"; |
| 100 | case NUD_DELAY: |
| 101 | return "delay"; |
| 102 | case NUD_PROBE: |
| 103 | return "probe"; |
| 104 | case NUD_FAILED: |
| 105 | return "failed"; |
| 106 | case NUD_NOARP: |
| 107 | return "noarp"; |
| 108 | case NUD_PERMANENT: |
| 109 | return "permanent"; |
| 110 | default: |
| 111 | snprintf(buf, len, "%x", state); |
| 112 | return buf; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | static int flush_update(void) |
| 117 | { |
| 118 | if (rtnl_send(filter.rth, filter.flushb, filter.flushp) < 0) { |
| 119 | perror("Failed to send flush request\n"); |
| 120 | return -1; |
| 121 | } |
| 122 | filter.flushp = 0; |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | |
| 127 | static int ipneigh_modify(int cmd, int flags, int argc, char **argv) |
| 128 | { |
| 129 | struct rtnl_handle rth; |
| 130 | struct { |
| 131 | struct nlmsghdr n; |
| 132 | struct ndmsg ndm; |
| 133 | char buf[256]; |
| 134 | } req; |
| 135 | char *d = NULL; |
| 136 | int dst_ok = 0; |
| 137 | int lladdr_ok = 0; |
| 138 | char * lla = NULL; |
| 139 | inet_prefix dst; |
| 140 | |
| 141 | memset(&req, 0, sizeof(req)); |
| 142 | |
| 143 | req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ndmsg)); |
| 144 | req.n.nlmsg_flags = NLM_F_REQUEST|flags; |
| 145 | req.n.nlmsg_type = cmd; |
| 146 | req.ndm.ndm_family = preferred_family; |
| 147 | req.ndm.ndm_state = NUD_PERMANENT; |
| 148 | |
| 149 | while (argc > 0) { |
| 150 | if (matches(*argv, "lladdr") == 0) { |
| 151 | NEXT_ARG(); |
| 152 | if (lladdr_ok) |
| 153 | duparg("lladdr", *argv); |
| 154 | lla = *argv; |
| 155 | lladdr_ok = 1; |
| 156 | } else if (strcmp(*argv, "nud") == 0) { |
| 157 | unsigned state; |
| 158 | NEXT_ARG(); |
| 159 | if (nud_state_a2n(&state, *argv)) |
| 160 | invarg("nud state is bad", *argv); |
| 161 | req.ndm.ndm_state = state; |
| 162 | } else if (matches(*argv, "proxy") == 0) { |
| 163 | NEXT_ARG(); |
| 164 | if (matches(*argv, "help") == 0) |
| 165 | usage(); |
| 166 | if (dst_ok) |
| 167 | duparg("address", *argv); |
| 168 | get_addr(&dst, *argv, preferred_family); |
| 169 | dst_ok = 1; |
| 170 | req.ndm.ndm_flags |= NTF_PROXY; |
| 171 | } else if (strcmp(*argv, "dev") == 0) { |
| 172 | NEXT_ARG(); |
| 173 | d = *argv; |
| 174 | } else { |
| 175 | if (strcmp(*argv, "to") == 0) { |
| 176 | NEXT_ARG(); |
| 177 | } |
| 178 | if (matches(*argv, "help") == 0) { |
| 179 | NEXT_ARG(); |
| 180 | } |
| 181 | if (dst_ok) |
| 182 | duparg2("to", *argv); |
| 183 | get_addr(&dst, *argv, preferred_family); |
| 184 | dst_ok = 1; |
| 185 | } |
| 186 | argc--; argv++; |
| 187 | } |
| 188 | if (d == NULL || !dst_ok || dst.family == AF_UNSPEC) { |
| 189 | fprintf(stderr, "Device and destination are required arguments.\n"); |
| 190 | exit(-1); |
| 191 | } |
| 192 | req.ndm.ndm_family = dst.family; |
| 193 | addattr_l(&req.n, sizeof(req), NDA_DST, &dst.data, dst.bytelen); |
| 194 | |
| 195 | if (lla && strcmp(lla, "null")) { |
| 196 | __u8 llabuf[16]; |
| 197 | int l; |
| 198 | |
| 199 | l = ll_addr_a2n(llabuf, sizeof(llabuf), lla); |
| 200 | addattr_l(&req.n, sizeof(req), NDA_LLADDR, llabuf, l); |
| 201 | } |
| 202 | |
| 203 | if (rtnl_open(&rth, 0) < 0) |
| 204 | exit(1); |
| 205 | |
| 206 | ll_init_map(&rth); |
| 207 | |
| 208 | if ((req.ndm.ndm_ifindex = ll_name_to_index(d)) == 0) { |
| 209 | fprintf(stderr, "Cannot find device \"%s\"\n", d); |
| 210 | return -1; |
| 211 | } |
| 212 | |
| 213 | if (rtnl_talk(&rth, &req.n, 0, 0, NULL, NULL, NULL) < 0) |
| 214 | exit(2); |
| 215 | |
| 216 | exit(0); |
| 217 | } |
| 218 | |
| 219 | |
| 220 | int print_neigh(struct sockaddr_nl *who, struct nlmsghdr *n, void *arg) |
| 221 | { |
| 222 | FILE *fp = (FILE*)arg; |
| 223 | struct ndmsg *r = NLMSG_DATA(n); |
| 224 | int len = n->nlmsg_len; |
| 225 | struct rtattr * tb[NDA_MAX+1]; |
| 226 | char abuf[256]; |
| 227 | |
| 228 | if (n->nlmsg_type != RTM_NEWNEIGH && n->nlmsg_type != RTM_DELNEIGH) { |
| 229 | fprintf(stderr, "Not RTM_NEWNEIGH: %08x %08x %08x\n", |
| 230 | n->nlmsg_len, n->nlmsg_type, n->nlmsg_flags); |
| 231 | |
| 232 | return 0; |
| 233 | } |
| 234 | len -= NLMSG_LENGTH(sizeof(*r)); |
| 235 | if (len < 0) { |
| 236 | fprintf(stderr, "BUG: wrong nlmsg len %d\n", len); |
| 237 | return -1; |
| 238 | } |
| 239 | |
| 240 | if (filter.flushb && n->nlmsg_type != RTM_NEWNEIGH) |
| 241 | return 0; |
| 242 | |
| 243 | if (filter.family && filter.family != r->ndm_family) |
| 244 | return 0; |
| 245 | if (filter.index && filter.index != r->ndm_ifindex) |
| 246 | return 0; |
| 247 | if (!(filter.state&r->ndm_state) && |
| 248 | (r->ndm_state || !(filter.state&0x100)) && |
| 249 | (r->ndm_family != AF_DECnet)) |
| 250 | return 0; |
| 251 | |
| 252 | memset(tb, 0, sizeof(tb)); |
| 253 | parse_rtattr(tb, NDA_MAX, NDA_RTA(r), n->nlmsg_len - NLMSG_LENGTH(sizeof(*r))); |
| 254 | |
| 255 | if (tb[NDA_DST]) { |
| 256 | if (filter.pfx.family) { |
| 257 | inet_prefix dst; |
| 258 | memset(&dst, 0, sizeof(dst)); |
| 259 | dst.family = r->ndm_family; |
| 260 | memcpy(&dst.data, RTA_DATA(tb[NDA_DST]), RTA_PAYLOAD(tb[NDA_DST])); |
| 261 | if (inet_addr_match(&dst, &filter.pfx, filter.pfx.bitlen)) |
| 262 | return 0; |
| 263 | } |
| 264 | } |
| 265 | if (filter.unused_only && tb[NDA_CACHEINFO]) { |
| 266 | struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]); |
| 267 | if (ci->ndm_refcnt) |
| 268 | return 0; |
| 269 | } |
| 270 | |
| 271 | if (filter.flushb) { |
| 272 | struct nlmsghdr *fn; |
| 273 | if (NLMSG_ALIGN(filter.flushp) + n->nlmsg_len > filter.flushe) { |
| 274 | if (flush_update()) |
| 275 | return -1; |
| 276 | } |
| 277 | fn = (struct nlmsghdr*)(filter.flushb + NLMSG_ALIGN(filter.flushp)); |
| 278 | memcpy(fn, n, n->nlmsg_len); |
| 279 | fn->nlmsg_type = RTM_DELNEIGH; |
| 280 | fn->nlmsg_flags = NLM_F_REQUEST; |
| 281 | fn->nlmsg_seq = ++filter.rth->seq; |
| 282 | filter.flushp = (((char*)fn) + n->nlmsg_len) - filter.flushb; |
| 283 | filter.flushed++; |
| 284 | if (show_stats < 2) |
| 285 | return 0; |
| 286 | } |
| 287 | |
| 288 | if (tb[NDA_DST]) { |
| 289 | fprintf(fp, "%s ", |
| 290 | format_host(r->ndm_family, |
| 291 | RTA_PAYLOAD(tb[NDA_DST]), |
| 292 | RTA_DATA(tb[NDA_DST]), |
| 293 | abuf, sizeof(abuf))); |
| 294 | } |
| 295 | if (!filter.index && r->ndm_ifindex) |
| 296 | fprintf(fp, "dev %s ", ll_index_to_name(r->ndm_ifindex)); |
| 297 | if (tb[NDA_LLADDR]) { |
| 298 | SPRINT_BUF(b1); |
| 299 | fprintf(fp, "lladdr %s", ll_addr_n2a(RTA_DATA(tb[NDA_LLADDR]), |
| 300 | RTA_PAYLOAD(tb[NDA_LLADDR]), |
| 301 | ll_index_to_type(r->ndm_ifindex), |
| 302 | b1, sizeof(b1))); |
| 303 | } |
| 304 | if (r->ndm_flags & NTF_ROUTER) { |
| 305 | fprintf(fp, " router"); |
| 306 | } |
| 307 | if (tb[NDA_CACHEINFO] && show_stats) { |
| 308 | static int hz; |
| 309 | struct nda_cacheinfo *ci = RTA_DATA(tb[NDA_CACHEINFO]); |
| 310 | if (!hz) |
| 311 | hz = get_hz(); |
| 312 | if (ci->ndm_refcnt) |
| 313 | printf(" ref %d", ci->ndm_refcnt); |
| 314 | fprintf(fp, " used %d/%d/%d", ci->ndm_used/hz, |
| 315 | ci->ndm_confirmed/hz, ci->ndm_updated/hz); |
| 316 | } |
| 317 | |
| 318 | if (r->ndm_state) { |
| 319 | SPRINT_BUF(b1); |
| 320 | fprintf(fp, " nud %s", nud_state_n2a(r->ndm_state, b1, sizeof(b1))); |
| 321 | } |
| 322 | fprintf(fp, "\n"); |
| 323 | |
| 324 | fflush(fp); |
| 325 | return 0; |
| 326 | } |
| 327 | |
| 328 | void ipneigh_reset_filter() |
| 329 | { |
| 330 | memset(&filter, 0, sizeof(filter)); |
| 331 | filter.state = ~0; |
| 332 | } |
| 333 | |
| 334 | int do_show_or_flush(int argc, char **argv, int flush) |
| 335 | { |
| 336 | char *filter_dev = NULL; |
| 337 | struct rtnl_handle rth; |
| 338 | int state_given = 0; |
| 339 | |
| 340 | ipneigh_reset_filter(); |
| 341 | |
| 342 | if (!filter.family) |
| 343 | filter.family = preferred_family; |
| 344 | |
| 345 | if (flush) { |
| 346 | if (argc <= 0) { |
| 347 | fprintf(stderr, "Flush requires arguments.\n"); |
| 348 | return -1; |
| 349 | } |
| 350 | filter.state = ~(NUD_PERMANENT|NUD_NOARP); |
| 351 | } else |
| 352 | filter.state = 0xFF & ~NUD_NOARP; |
| 353 | |
| 354 | while (argc > 0) { |
| 355 | if (strcmp(*argv, "dev") == 0) { |
| 356 | NEXT_ARG(); |
| 357 | if (filter_dev) |
| 358 | duparg("dev", *argv); |
| 359 | filter_dev = *argv; |
| 360 | } else if (strcmp(*argv, "unused") == 0) { |
| 361 | filter.unused_only = 1; |
| 362 | } else if (strcmp(*argv, "nud") == 0) { |
| 363 | unsigned state; |
| 364 | NEXT_ARG(); |
| 365 | if (!state_given) { |
| 366 | state_given = 1; |
| 367 | filter.state = 0; |
| 368 | } |
| 369 | if (nud_state_a2n(&state, *argv)) { |
| 370 | if (strcmp(*argv, "all") != 0) |
| 371 | invarg("nud state is bad", *argv); |
| 372 | state = ~0; |
| 373 | if (flush) |
| 374 | state &= ~NUD_NOARP; |
| 375 | } |
| 376 | if (state == 0) |
| 377 | state = 0x100; |
| 378 | filter.state |= state; |
| 379 | } else { |
| 380 | if (strcmp(*argv, "to") == 0) { |
| 381 | NEXT_ARG(); |
| 382 | } |
| 383 | if (matches(*argv, "help") == 0) |
| 384 | usage(); |
| 385 | get_prefix(&filter.pfx, *argv, filter.family); |
| 386 | if (filter.family == AF_UNSPEC) |
| 387 | filter.family = filter.pfx.family; |
| 388 | } |
| 389 | argc--; argv++; |
| 390 | } |
| 391 | |
| 392 | if (rtnl_open(&rth, 0) < 0) |
| 393 | exit(1); |
| 394 | |
| 395 | ll_init_map(&rth); |
| 396 | |
| 397 | if (filter_dev) { |
| 398 | if ((filter.index = ll_name_to_index(filter_dev)) == 0) { |
| 399 | fprintf(stderr, "Cannot find device \"%s\"\n", filter_dev); |
| 400 | return -1; |
| 401 | } |
| 402 | } |
| 403 | |
| 404 | if (flush) { |
| 405 | int round = 0; |
| 406 | char flushb[4096-512]; |
| 407 | |
| 408 | filter.flushb = flushb; |
| 409 | filter.flushp = 0; |
| 410 | filter.flushe = sizeof(flushb); |
| 411 | filter.rth = &rth; |
| 412 | filter.state &= ~NUD_FAILED; |
| 413 | |
| 414 | for (;;) { |
| 415 | if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNEIGH) < 0) { |
| 416 | perror("Cannot send dump request"); |
| 417 | exit(1); |
| 418 | } |
| 419 | filter.flushed = 0; |
| 420 | if (rtnl_dump_filter(&rth, print_neigh, stdout, NULL, NULL) < 0) { |
| 421 | fprintf(stderr, "Flush terminated\n"); |
| 422 | exit(1); |
| 423 | } |
| 424 | if (filter.flushed == 0) { |
| 425 | if (round == 0) { |
| 426 | fprintf(stderr, "Nothing to flush.\n"); |
| 427 | } else if (show_stats) |
| 428 | printf("*** Flush is complete after %d round%s ***\n", round, round>1?"s":""); |
| 429 | fflush(stdout); |
| 430 | return 0; |
| 431 | } |
| 432 | round++; |
| 433 | if (flush_update() < 0) |
| 434 | exit(1); |
| 435 | if (show_stats) { |
| 436 | printf("\n*** Round %d, deleting %d entries ***\n", round, filter.flushed); |
| 437 | fflush(stdout); |
| 438 | } |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | if (rtnl_wilddump_request(&rth, filter.family, RTM_GETNEIGH) < 0) { |
| 443 | perror("Cannot send dump request"); |
| 444 | exit(1); |
| 445 | } |
| 446 | |
| 447 | if (rtnl_dump_filter(&rth, print_neigh, stdout, NULL, NULL) < 0) { |
| 448 | fprintf(stderr, "Dump terminated\n"); |
| 449 | exit(1); |
| 450 | } |
| 451 | |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | int do_ipneigh(int argc, char **argv) |
| 456 | { |
| 457 | if (argc > 0) { |
| 458 | if (matches(*argv, "add") == 0) |
| 459 | return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_EXCL, argc-1, argv+1); |
| 460 | if (matches(*argv, "change") == 0 || |
| 461 | strcmp(*argv, "chg") == 0) |
| 462 | return ipneigh_modify(RTM_NEWNEIGH, NLM_F_REPLACE, argc-1, argv+1); |
| 463 | if (matches(*argv, "replace") == 0) |
| 464 | return ipneigh_modify(RTM_NEWNEIGH, NLM_F_CREATE|NLM_F_REPLACE, argc-1, argv+1); |
| 465 | if (matches(*argv, "delete") == 0) |
| 466 | return ipneigh_modify(RTM_DELNEIGH, 0, argc-1, argv+1); |
| 467 | if (matches(*argv, "get") == 0) { |
| 468 | fprintf(stderr, "Sorry, \"neigh get\" is not implemented :-(\n"); |
| 469 | return -1; |
| 470 | } |
| 471 | if (matches(*argv, "show") == 0 || |
| 472 | matches(*argv, "lst") == 0 || |
| 473 | matches(*argv, "list") == 0) |
| 474 | return do_show_or_flush(argc-1, argv+1, 0); |
| 475 | if (matches(*argv, "flush") == 0) |
| 476 | return do_show_or_flush(argc-1, argv+1, 1); |
| 477 | if (matches(*argv, "help") == 0) |
| 478 | usage(); |
| 479 | } else |
| 480 | return do_show_or_flush(0, NULL, 0); |
| 481 | |
| 482 | fprintf(stderr, "Command \"%s\" is unknown, try \"ip neigh help\".\n", *argv); |
| 483 | exit(-1); |
| 484 | } |