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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 | /* vi: set sw=4 ts=4: */ /* route * * Similar to the standard Unix route, but with only the necessary * parts for AF_INET and AF_INET6 * * Bjorn Wesen, Axis Communications AB * * Author of the original route: * Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org> * (derived from FvK's 'route.c 1.70 01/04/94') * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * * * displayroute() code added by Vladimir N. Oleynik <dzo@simtreas.ru> * adjustments by Larry Doolittle <LRDoolittle@lbl.gov> * * IPV6 support added by Bart Visscher <magick@linux-fan.com> */ /* 2004/03/09 Manuel Novoa III <mjn3@codepoet.org> * * Rewritten to fix several bugs, add additional error checking, and * remove ridiculous amounts of bloat. */ #include <getopt.h> #include <net/route.h> #include <net/if.h> #include "libbb.h" #include "inet_common.h" #ifndef RTF_UP /* Keep this in sync with /usr/src/linux/include/linux/route.h */ #define RTF_UP 0x0001 /* route usable */ #define RTF_GATEWAY 0x0002 /* destination is a gateway */ #define RTF_HOST 0x0004 /* host entry (net otherwise) */ #define RTF_REINSTATE 0x0008 /* reinstate route after tmout */ #define RTF_DYNAMIC 0x0010 /* created dyn. (by redirect) */ #define RTF_MODIFIED 0x0020 /* modified dyn. (by redirect) */ #define RTF_MTU 0x0040 /* specific MTU for this route */ #ifndef RTF_MSS #define RTF_MSS RTF_MTU /* Compatibility :-( */ #endif #define RTF_WINDOW 0x0080 /* per route window clamping */ #define RTF_IRTT 0x0100 /* Initial round trip time */ #define RTF_REJECT 0x0200 /* Reject route */ #endif #if defined(SIOCADDRTOLD) || defined(RTF_IRTT) /* route */ #define HAVE_NEW_ADDRT 1 #endif #if HAVE_NEW_ADDRT #define mask_in_addr(x) (((struct sockaddr_in *)&((x).rt_genmask))->sin_addr.s_addr) #define full_mask(x) (x) #else #define mask_in_addr(x) ((x).rt_genmask) #define full_mask(x) (((struct sockaddr_in *)&(x))->sin_addr.s_addr) #endif /* The RTACTION entries must agree with tbl_verb[] below! */ #define RTACTION_ADD 1 #define RTACTION_DEL 2 /* For the various tbl_*[] arrays, the 1st byte is the offset to * the next entry and the 2nd byte is return value. */ #define NET_FLAG 1 #define HOST_FLAG 2 /* We remap '-' to '#' to avoid problems with getopt. */ static const char tbl_hash_net_host[] = "\007\001#net\0" /* "\010\002#host\0" */ "\007\002#host" /* Since last, we can save a byte. */ ; #define KW_TAKES_ARG 020 #define KW_SETS_FLAG 040 #define KW_IPVx_METRIC 020 #define KW_IPVx_NETMASK 021 #define KW_IPVx_GATEWAY 022 #define KW_IPVx_MSS 023 #define KW_IPVx_WINDOW 024 #define KW_IPVx_IRTT 025 #define KW_IPVx_DEVICE 026 #define KW_IPVx_FLAG_ONLY 040 #define KW_IPVx_REJECT 040 #define KW_IPVx_MOD 041 #define KW_IPVx_DYN 042 #define KW_IPVx_REINSTATE 043 static const char tbl_ipvx[] = /* 020 is the "takes an arg" bit */ #if HAVE_NEW_ADDRT "\011\020metric\0" #endif "\012\021netmask\0" "\005\022gw\0" "\012\022gateway\0" "\006\023mss\0" "\011\024window\0" #ifdef RTF_IRTT "\007\025irtt\0" #endif "\006\026dev\0" "\011\026device\0" /* 040 is the "sets a flag" bit - MUST match flags_ipvx[] values below. */ #ifdef RTF_REJECT "\011\040reject\0" #endif "\006\041mod\0" "\006\042dyn\0" /* "\014\043reinstate\0" */ "\013\043reinstate" /* Since last, we can save a byte. */ ; static const int flags_ipvx[] = { /* MUST match tbl_ipvx[] values above. */ #ifdef RTF_REJECT RTF_REJECT, #endif RTF_MODIFIED, RTF_DYNAMIC, RTF_REINSTATE }; static int kw_lookup(const char *kwtbl, char ***pargs) { if (**pargs) { do { if (strcmp(kwtbl+2, **pargs) == 0) { /* Found a match. */ *pargs += 1; if (kwtbl[1] & KW_TAKES_ARG) { if (!**pargs) { /* No more args! */ bb_show_usage(); } *pargs += 1; /* Calling routine will use args[-1]. */ } return kwtbl[1]; } kwtbl += *kwtbl; } while (*kwtbl); } return 0; } /* Add or delete a route, depending on action. */ static void INET_setroute(int action, char **args) { struct rtentry rt; const char *netmask = NULL; int skfd, isnet, xflag; /* Grab the -net or -host options. Remember they were transformed. */ xflag = kw_lookup(tbl_hash_net_host, &args); /* If we did grab -net or -host, make sure we still have an arg left. */ if (*args == NULL) { bb_show_usage(); } /* Clean out the RTREQ structure. */ memset(&rt, 0, sizeof(rt)); { const char *target = *args++; char *prefix; /* recognize x.x.x.x/mask format. */ prefix = strchr(target, '/'); if (prefix) { int prefix_len; prefix_len = xatoul_range(prefix+1, 0, 32); mask_in_addr(rt) = htonl( ~ (0xffffffffUL >> prefix_len)); *prefix = '\0'; #if HAVE_NEW_ADDRT rt.rt_genmask.sa_family = AF_INET; #endif } else { /* Default netmask. */ netmask = bb_str_default; } /* Prefer hostname lookup is -host flag (xflag==1) was given. */ isnet = INET_resolve(target, (struct sockaddr_in *) &rt.rt_dst, (xflag & HOST_FLAG)); if (isnet < 0) { bb_error_msg_and_die("resolving %s", target); } if (prefix) { /* do not destroy prefix for process args */ *prefix = '/'; } } if (xflag) { /* Reinit isnet if -net or -host was specified. */ isnet = (xflag & NET_FLAG); } /* Fill in the other fields. */ rt.rt_flags = ((isnet) ? RTF_UP : (RTF_UP | RTF_HOST)); while (*args) { int k = kw_lookup(tbl_ipvx, &args); const char *args_m1 = args[-1]; if (k & KW_IPVx_FLAG_ONLY) { rt.rt_flags |= flags_ipvx[k & 3]; continue; } #if HAVE_NEW_ADDRT if (k == KW_IPVx_METRIC) { rt.rt_metric = xatoul(args_m1) + 1; continue; } #endif if (k == KW_IPVx_NETMASK) { struct sockaddr mask; if (mask_in_addr(rt)) { bb_show_usage(); } netmask = args_m1; isnet = INET_resolve(netmask, (struct sockaddr_in *) &mask, 0); if (isnet < 0) { bb_error_msg_and_die("resolving %s", netmask); } rt.rt_genmask = full_mask(mask); continue; } if (k == KW_IPVx_GATEWAY) { if (rt.rt_flags & RTF_GATEWAY) { bb_show_usage(); } isnet = INET_resolve(args_m1, (struct sockaddr_in *) &rt.rt_gateway, 1); rt.rt_flags |= RTF_GATEWAY; if (isnet) { if (isnet < 0) { bb_error_msg_and_die("resolving %s", args_m1); } bb_error_msg_and_die("gateway %s is a NETWORK", args_m1); } continue; } if (k == KW_IPVx_MSS) { /* Check valid MSS bounds. */ rt.rt_flags |= RTF_MSS; rt.rt_mss = xatoul_range(args_m1, 64, 32768); continue; } if (k == KW_IPVx_WINDOW) { /* Check valid window bounds. */ rt.rt_flags |= RTF_WINDOW; rt.rt_window = xatoul_range(args_m1, 128, INT_MAX); continue; } #ifdef RTF_IRTT if (k == KW_IPVx_IRTT) { rt.rt_flags |= RTF_IRTT; rt.rt_irtt = xatoul(args_m1); rt.rt_irtt *= (sysconf(_SC_CLK_TCK) / 100); /* FIXME */ #if 0 /* FIXME: do we need to check anything of this? */ if (rt.rt_irtt < 1 || rt.rt_irtt > (120 * HZ)) { bb_error_msg_and_die("bad irtt"); } #endif continue; } #endif /* Device is special in that it can be the last arg specified * and doesn't requre the dev/device keyword in that case. */ if (!rt.rt_dev && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) { /* Don't use args_m1 here since args may have changed! */ rt.rt_dev = args[-1]; continue; } /* Nothing matched. */ bb_show_usage(); } #ifdef RTF_REJECT if ((rt.rt_flags & RTF_REJECT) && !rt.rt_dev) { rt.rt_dev = (char*)"lo"; } #endif /* sanity checks.. */ if (mask_in_addr(rt)) { unsigned long mask = mask_in_addr(rt); mask = ~ntohl(mask); if ((rt.rt_flags & RTF_HOST) && mask != 0xffffffff) { bb_error_msg_and_die("netmask %.8x and host route conflict", (unsigned int) mask); } if (mask & (mask + 1)) { bb_error_msg_and_die("bogus netmask %s", netmask); } mask = ((struct sockaddr_in *) &rt.rt_dst)->sin_addr.s_addr; if (mask & ~mask_in_addr(rt)) { bb_error_msg_and_die("netmask and route address conflict"); } } /* Fill out netmask if still unset */ if ((action == RTACTION_ADD) && (rt.rt_flags & RTF_HOST)) { mask_in_addr(rt) = 0xffffffff; } /* Create a socket to the INET kernel. */ skfd = xsocket(AF_INET, SOCK_DGRAM, 0); if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) { bb_perror_msg_and_die("SIOC[ADD|DEL]RT"); } if (ENABLE_FEATURE_CLEAN_UP) close(skfd); } #if ENABLE_FEATURE_IPV6 static void INET6_setroute(int action, char **args) { struct sockaddr_in6 sa6; struct in6_rtmsg rt; int prefix_len, skfd; const char *devname; /* We know args isn't NULL from the check in route_main. */ const char *target = *args++; if (strcmp(target, bb_str_default) == 0) { prefix_len = 0; memset(&sa6, 0, sizeof(sa6)); } else { char *cp; if ((cp = strchr(target, '/'))) { /* Yes... const to non is ok. */ *cp = 0; prefix_len = xatoul_range(cp+1, 0, 128); } else { prefix_len = 128; } if (INET6_resolve(target, (struct sockaddr_in6 *) &sa6) < 0) { bb_error_msg_and_die("resolving %s", target); } } /* Clean out the RTREQ structure. */ memset(&rt, 0, sizeof(rt)); memcpy(&rt.rtmsg_dst, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr)); /* Fill in the other fields. */ rt.rtmsg_dst_len = prefix_len; rt.rtmsg_flags = ((prefix_len == 128) ? (RTF_UP|RTF_HOST) : RTF_UP); rt.rtmsg_metric = 1; devname = NULL; while (*args) { int k = kw_lookup(tbl_ipvx, &args); const char *args_m1 = args[-1]; if ((k == KW_IPVx_MOD) || (k == KW_IPVx_DYN)) { rt.rtmsg_flags |= flags_ipvx[k & 3]; continue; } if (k == KW_IPVx_METRIC) { rt.rtmsg_metric = xatoul(args_m1); continue; } if (k == KW_IPVx_GATEWAY) { if (rt.rtmsg_flags & RTF_GATEWAY) { bb_show_usage(); } if (INET6_resolve(args_m1, (struct sockaddr_in6 *) &sa6) < 0) { bb_error_msg_and_die("resolving %s", args_m1); } memcpy(&rt.rtmsg_gateway, sa6.sin6_addr.s6_addr, sizeof(struct in6_addr)); rt.rtmsg_flags |= RTF_GATEWAY; continue; } /* Device is special in that it can be the last arg specified * and doesn't requre the dev/device keyword in that case. */ if (!devname && ((k == KW_IPVx_DEVICE) || (!k && !*++args))) { /* Don't use args_m1 here since args may have changed! */ devname = args[-1]; continue; } /* Nothing matched. */ bb_show_usage(); } /* Create a socket to the INET6 kernel. */ skfd = xsocket(AF_INET6, SOCK_DGRAM, 0); rt.rtmsg_ifindex = 0; if (devname) { struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strncpy(ifr.ifr_name, devname, sizeof(ifr.ifr_name)); if (ioctl(skfd, SIOGIFINDEX, &ifr) < 0) { bb_perror_msg_and_die("SIOGIFINDEX"); } rt.rtmsg_ifindex = ifr.ifr_ifindex; } /* Tell the kernel to accept this route. */ if (ioctl(skfd, ((action==RTACTION_ADD) ? SIOCADDRT : SIOCDELRT), &rt)<0) { bb_perror_msg_and_die("SIOC[ADD|DEL]RT"); } if (ENABLE_FEATURE_CLEAN_UP) close(skfd); } #endif static const unsigned int flagvals[] = { /* Must agree with flagchars[]. */ RTF_GATEWAY, RTF_HOST, RTF_REINSTATE, RTF_DYNAMIC, RTF_MODIFIED, #if ENABLE_FEATURE_IPV6 RTF_DEFAULT, RTF_ADDRCONF, RTF_CACHE #endif }; #define IPV4_MASK (RTF_GATEWAY|RTF_HOST|RTF_REINSTATE|RTF_DYNAMIC|RTF_MODIFIED) #define IPV6_MASK (RTF_GATEWAY|RTF_HOST|RTF_DEFAULT|RTF_ADDRCONF|RTF_CACHE) static const char flagchars[] = /* Must agree with flagvals[]. */ "GHRDM" #if ENABLE_FEATURE_IPV6 "DAC" #endif ; static void set_flags(char *flagstr, int flags) { int i; *flagstr++ = 'U'; for (i = 0; (*flagstr = flagchars[i]) != 0; i++) { if (flags & flagvals[i]) { ++flagstr; } } } /* also used in netstat */ void bb_displayroutes(int noresolve, int netstatfmt) { char devname[64], flags[16], sdest[16], sgw[16]; unsigned long d, g, m; int flgs, ref, use, metric, mtu, win, ir; struct sockaddr_in s_addr; struct in_addr mask; FILE *fp = xfopen("/proc/net/route", "r"); printf("Kernel IP routing table\n" "Destination Gateway Genmask Flags %s Iface\n", netstatfmt ? " MSS Window irtt" : "Metric Ref Use"); if (fscanf(fp, "%*[^\n]\n") < 0) { /* Skip the first line. */ goto ERROR; /* Empty or missing line, or read error. */ } while (1) { int r; r = fscanf(fp, "%63s%lx%lx%X%d%d%d%lx%d%d%d\n", devname, &d, &g, &flgs, &ref, &use, &metric, &m, &mtu, &win, &ir); if (r != 11) { if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ break; } ERROR: bb_error_msg_and_die("fscanf"); } if (!(flgs & RTF_UP)) { /* Skip interfaces that are down. */ continue; } set_flags(flags, (flgs & IPV4_MASK)); #ifdef RTF_REJECT if (flgs & RTF_REJECT) { flags[0] = '!'; } #endif memset(&s_addr, 0, sizeof(struct sockaddr_in)); s_addr.sin_family = AF_INET; s_addr.sin_addr.s_addr = d; INET_rresolve(sdest, sizeof(sdest), &s_addr, (noresolve | 0x8000), m); /* Default instead of *. */ s_addr.sin_addr.s_addr = g; INET_rresolve(sgw, sizeof(sgw), &s_addr, (noresolve | 0x4000), m); /* Host instead of net. */ mask.s_addr = m; printf("%-16s%-16s%-16s%-6s", sdest, sgw, inet_ntoa(mask), flags); if (netstatfmt) { printf("%5d %-5d %6d %s\n", mtu, win, ir, devname); } else { printf("%-6d %-2d %7d %s\n", metric, ref, use, devname); } } } #if ENABLE_FEATURE_IPV6 static void INET6_displayroutes(int noresolve) { char addr6[128], naddr6[128]; /* In addr6x, we store both 40-byte ':'-delimited ipv6 addresses. * We read the non-delimited strings into the tail of the buffer * using fscanf and then modify the buffer by shifting forward * while inserting ':'s and the nul terminator for the first string. * Hence the strings are at addr6x and addr6x+40. This generates * _much_ less code than the previous (upstream) approach. */ char addr6x[80]; char iface[16], flags[16]; int iflags, metric, refcnt, use, prefix_len, slen; struct sockaddr_in6 snaddr6; FILE *fp = xfopen("/proc/net/ipv6_route", "r"); printf("Kernel IPv6 routing table\n%-44s%-40s" "Flags Metric Ref Use Iface\n", "Destination", "Next Hop"); while (1) { int r; r = fscanf(fp, "%32s%x%*s%x%32s%x%x%x%x%s\n", addr6x+14, &prefix_len, &slen, addr6x+40+7, &metric, &use, &refcnt, &iflags, iface); if (r != 9) { if ((r < 0) && feof(fp)) { /* EOF with no (nonspace) chars read. */ break; } ERROR: bb_error_msg_and_die("fscanf"); } /* Do the addr6x shift-and-insert changes to ':'-delimit addresses. * For now, always do this to validate the proc route format, even * if the interface is down. */ { int i = 0; char *p = addr6x+14; do { if (!*p) { if (i==40) { /* nul terminator for 1st address? */ addr6x[39] = 0; /* Fixup... need 0 instead of ':'. */ ++p; /* Skip and continue. */ continue; } goto ERROR; } addr6x[i++] = *p++; if (!((i+1) % 5)) { addr6x[i++] = ':'; } } while (i < 40+28+7); } if (!(iflags & RTF_UP)) { /* Skip interfaces that are down. */ continue; } set_flags(flags, (iflags & IPV6_MASK)); r = 0; do { inet_pton(AF_INET6, addr6x + r, (struct sockaddr *) &snaddr6.sin6_addr); snaddr6.sin6_family = AF_INET6; INET6_rresolve(naddr6, sizeof(naddr6), (struct sockaddr_in6 *) &snaddr6, 0x0fff /* Apparently, upstream never resolves. */ ); if (!r) { /* 1st pass */ snprintf(addr6, sizeof(addr6), "%s/%d", naddr6, prefix_len); r += 40; } else { /* 2nd pass */ /* Print the info. */ printf("%-43s %-39s %-5s %-6d %-2d %7d %-8s\n", addr6, naddr6, flags, metric, refcnt, use, iface); break; } } while (1); } } #endif #define ROUTE_OPT_A 0x01 #define ROUTE_OPT_n 0x02 #define ROUTE_OPT_e 0x04 #define ROUTE_OPT_INET6 0x08 /* Not an actual option. See below. */ /* 1st byte is offset to next entry offset. 2nd byte is return value. */ static const char tbl_verb[] = /* 2nd byte matches RTACTION_* code */ "\006\001add\0" "\006\002del\0" /* "\011\002delete\0" */ "\010\002delete" /* Since last, we can save a byte. */ ; int route_main(int argc, char **argv); int route_main(int argc, char **argv) { unsigned opt; int what; char *family; char **p; /* First, remap '-net' and '-host' to avoid getopt problems. */ p = argv; while (*++p) { if (strcmp(*p, "-net") == 0 || strcmp(*p, "-host") == 0) { p[0][0] = '#'; } } opt = getopt32(argc, argv, "A:ne", &family); if ((opt & ROUTE_OPT_A) && strcmp(family, "inet") != 0) { #if ENABLE_FEATURE_IPV6 if (strcmp(family, "inet6") == 0) { opt |= ROUTE_OPT_INET6; /* Set flag for ipv6. */ } else #endif bb_show_usage(); } argv += optind; /* No more args means display the routing table. */ if (!*argv) { int noresolve = (opt & ROUTE_OPT_n) ? 0x0fff : 0; #if ENABLE_FEATURE_IPV6 if (opt & ROUTE_OPT_INET6) INET6_displayroutes(noresolve); else #endif bb_displayroutes(noresolve, opt & ROUTE_OPT_e); fflush_stdout_and_exit(EXIT_SUCCESS); } /* Check verb. At the moment, must be add, del, or delete. */ what = kw_lookup(tbl_verb, &argv); if (!what || !*argv) { /* Unknown verb or no more args. */ bb_show_usage(); } #if ENABLE_FEATURE_IPV6 if (opt & ROUTE_OPT_INET6) INET6_setroute(what, argv); else #endif INET_setroute(what, argv); return EXIT_SUCCESS; } |