route.c revision 31739
1/* 2 * PPP Routing related Module 3 * 4 * Written by Toshiharu OHNO (tony-o@iij.ad.jp) 5 * 6 * Copyright (C) 1994, Internet Initiative Japan, Inc. All rights reserverd. 7 * 8 * Redistribution and use in source and binary forms are permitted 9 * provided that the above copyright notice and this paragraph are 10 * duplicated in all such forms and that any documentation, 11 * advertising materials, and other materials related to such 12 * distribution and use acknowledge that the software was developed 13 * by the Internet Initiative Japan, Inc. The name of the 14 * IIJ may not be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 18 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 19 * 20 * $Id: route.c,v 1.31 1997/12/13 02:37:32 brian Exp $ 21 * 22 */ 23 24#include <sys/param.h> 25#include <sys/time.h> 26#include <sys/socket.h> 27#include <net/if_types.h> 28#include <net/route.h> 29#include <net/if.h> 30#include <netinet/in_systm.h> 31#include <netinet/in.h> 32#include <arpa/inet.h> 33#include <net/if_dl.h> 34 35#include <errno.h> 36#include <machine/endian.h> 37#include <stdio.h> 38#include <stdlib.h> 39#include <string.h> 40#include <sys/ioctl.h> 41#include <sys/sysctl.h> 42#include <unistd.h> 43 44#include "command.h" 45#include "mbuf.h" 46#include "log.h" 47#include "loadalias.h" 48#include "defs.h" 49#include "vars.h" 50#include "id.h" 51#include "os.h" 52#include "ipcp.h" 53#include "iplist.h" 54#include "route.h" 55 56static int IfIndex; 57static const char *Index2Nam(int); 58 59struct rtmsg { 60 struct rt_msghdr m_rtm; 61 char m_space[64]; 62}; 63 64static int seqno; 65 66void 67OsSetRoute(int cmd, 68 struct in_addr dst, 69 struct in_addr gateway, 70 struct in_addr mask) 71{ 72 struct rtmsg rtmes; 73 int s, nb, wb; 74 char *cp; 75 const char *cmdstr; 76 struct sockaddr_in rtdata; 77 78 cmdstr = (cmd == RTM_ADD ? "Add" : "Delete"); 79 s = ID0socket(PF_ROUTE, SOCK_RAW, 0); 80 if (s < 0) { 81 LogPrintf(LogERROR, "OsSetRoute: socket(): %s\n", strerror(errno)); 82 return; 83 } 84 memset(&rtmes, '\0', sizeof(rtmes)); 85 rtmes.m_rtm.rtm_version = RTM_VERSION; 86 rtmes.m_rtm.rtm_type = cmd; 87 rtmes.m_rtm.rtm_addrs = RTA_DST; 88 rtmes.m_rtm.rtm_seq = ++seqno; 89 rtmes.m_rtm.rtm_pid = getpid(); 90 rtmes.m_rtm.rtm_flags = RTF_UP | RTF_GATEWAY | RTF_STATIC; 91 92 memset(&rtdata, '\0', sizeof(rtdata)); 93 rtdata.sin_len = 16; 94 rtdata.sin_family = AF_INET; 95 rtdata.sin_port = 0; 96 rtdata.sin_addr = dst; 97 98 cp = rtmes.m_space; 99 memcpy(cp, &rtdata, 16); 100 cp += 16; 101 if (cmd == RTM_ADD) 102 if (gateway.s_addr == INADDR_ANY) { 103 /* Add a route through the interface */ 104 struct sockaddr_dl dl; 105 const char *iname; 106 int ilen; 107 108 iname = Index2Nam(IfIndex); 109 ilen = strlen(iname); 110 dl.sdl_len = sizeof(dl)-sizeof(dl.sdl_data)+ilen; 111 dl.sdl_family = AF_LINK; 112 dl.sdl_index = IfIndex; 113 dl.sdl_type = 0; 114 dl.sdl_nlen = ilen; 115 dl.sdl_alen = 0; 116 dl.sdl_slen = 0; 117 strcpy(dl.sdl_data, iname); 118 119 memcpy(cp, &dl, dl.sdl_len); 120 cp += dl.sdl_len; 121 rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY; 122 } else { 123 rtdata.sin_addr = gateway; 124 memcpy(cp, &rtdata, 16); 125 cp += 16; 126 rtmes.m_rtm.rtm_addrs |= RTA_GATEWAY; 127 } 128 129 if (dst.s_addr == INADDR_ANY) 130 mask.s_addr = INADDR_ANY; 131 132 if (cmd == RTM_ADD || dst.s_addr == INADDR_ANY) { 133 rtdata.sin_addr = mask; 134 memcpy(cp, &rtdata, 16); 135 cp += 16; 136 rtmes.m_rtm.rtm_addrs |= RTA_NETMASK; 137 } 138 139 nb = cp - (char *) &rtmes; 140 rtmes.m_rtm.rtm_msglen = nb; 141 wb = write(s, &rtmes, nb); 142 if (wb < 0) { 143 LogPrintf(LogTCPIP, "OsSetRoute failure:\n"); 144 LogPrintf(LogTCPIP, "OsSetRoute: Cmd = %s\n", cmd); 145 LogPrintf(LogTCPIP, "OsSetRoute: Dst = %s\n", inet_ntoa(dst)); 146 LogPrintf(LogTCPIP, "OsSetRoute: Gateway = %s\n", inet_ntoa(gateway)); 147 LogPrintf(LogTCPIP, "OsSetRoute: Mask = %s\n", inet_ntoa(mask)); 148 switch (rtmes.m_rtm.rtm_errno) { 149 case EEXIST: 150 LogPrintf(LogWARN, "Add route failed: %s already exists\n", 151 inet_ntoa(dst)); 152 break; 153 case ESRCH: 154 LogPrintf(LogWARN, "Del route failed: %s: Non-existent\n", 155 inet_ntoa(dst)); 156 break; 157 case 0: 158 LogPrintf(LogWARN, "%s route failed: %s: errno: %s\n", cmdstr, 159 inet_ntoa(dst), strerror(errno)); 160 break; 161 case ENOBUFS: 162 default: 163 LogPrintf(LogWARN, "%s route failed: %s: %s\n", 164 cmdstr, inet_ntoa(dst), strerror(rtmes.m_rtm.rtm_errno)); 165 break; 166 } 167 } 168 LogPrintf(LogDEBUG, "wrote %d: cmd = %s, dst = %x, gateway = %x\n", 169 wb, cmdstr, dst.s_addr, gateway.s_addr); 170 close(s); 171} 172 173static void 174p_sockaddr(struct sockaddr *phost, struct sockaddr *pmask, int width) 175{ 176 char buf[29]; 177 struct sockaddr_in *ihost = (struct sockaddr_in *)phost; 178 struct sockaddr_in *mask = (struct sockaddr_in *)pmask; 179 struct sockaddr_dl *dl = (struct sockaddr_dl *)phost; 180 181 switch (phost->sa_family) { 182 case AF_INET: 183 if (!phost) 184 buf[0] = '\0'; 185 else if (ihost->sin_addr.s_addr == INADDR_ANY) 186 strcpy(buf, "default"); 187 else if (!mask) 188 strcpy(buf, inet_ntoa(ihost->sin_addr)); 189 else { 190 u_int msk = ntohl(mask->sin_addr.s_addr); 191 u_int tst; 192 int bits; 193 int len; 194 struct sockaddr_in net; 195 196 for (tst = 1, bits=32; tst; tst <<= 1, bits--) 197 if (msk & tst) 198 break; 199 200 for (tst <<=1; tst; tst <<= 1) 201 if (!(msk & tst)) 202 break; 203 204 net.sin_addr.s_addr = ihost->sin_addr.s_addr & mask->sin_addr.s_addr; 205 sprintf(buf, "%s", inet_ntoa(net.sin_addr)); 206 for (len = strlen(buf); len > 3; buf[len-=2] = '\0') 207 if (strcmp(buf+len-2, ".0")) 208 break; 209 210 if (tst) /* non-contiguous :-( */ 211 sprintf(buf+strlen(buf),"&0x%08x", msk); 212 else 213 sprintf(buf+strlen(buf), "/%d", bits); 214 } 215 break; 216 217 case AF_LINK: 218 if (dl->sdl_nlen) 219 snprintf(buf, sizeof buf, "%.*s", dl->sdl_nlen, dl->sdl_data); 220 else if (dl->sdl_alen) 221 if (dl->sdl_type == IFT_ETHER) 222 if (dl->sdl_alen < sizeof(buf)/3) { 223 int f; 224 u_char *MAC; 225 226 MAC = (u_char *)dl->sdl_data + dl->sdl_nlen; 227 for (f = 0; f < dl->sdl_alen; f++) 228 sprintf(buf+f*3, "%02x:", MAC[f]); 229 buf[f*3-1] = '\0'; 230 } else 231 sprintf(buf, "??:??:??:??:??:??"); 232 else 233 sprintf(buf, "<IFT type %d>", dl->sdl_type); 234 else if (dl->sdl_slen) 235 sprintf(buf, "<slen %d?>", dl->sdl_slen); 236 else 237 sprintf(buf, "link#%d", dl->sdl_index); 238 break; 239 240 default: 241 sprintf(buf, "<AF type %d>", phost->sa_family); 242 break; 243 } 244 245 fprintf(VarTerm, "%-*s ", width-1, buf); 246} 247 248struct bits { 249 u_long b_mask; 250 char b_val; 251} bits[] = { 252 { RTF_UP, 'U' }, 253 { RTF_GATEWAY, 'G' }, 254 { RTF_HOST, 'H' }, 255 { RTF_REJECT, 'R' }, 256 { RTF_DYNAMIC, 'D' }, 257 { RTF_MODIFIED, 'M' }, 258 { RTF_DONE, 'd' }, 259 { RTF_CLONING, 'C' }, 260 { RTF_XRESOLVE, 'X' }, 261 { RTF_LLINFO, 'L' }, 262 { RTF_STATIC, 'S' }, 263 { RTF_PROTO1, '1' }, 264 { RTF_PROTO2, '2' }, 265 { RTF_BLACKHOLE, 'B' }, 266#ifdef RTF_WASCLONED 267 { RTF_WASCLONED, 'W' }, 268#endif 269#ifdef RTF_PRCLONING 270 { RTF_PRCLONING, 'c' }, 271#endif 272#ifdef RTF_PROTO3 273 { RTF_PROTO3, '3' }, 274#endif 275#ifdef RTF_BROADCAST 276 { RTF_BROADCAST, 'b' }, 277#endif 278 { 0, '\0' } 279}; 280 281#ifndef RTF_WASCLONED 282#define RTF_WASCLONED (0) 283#endif 284 285static void 286p_flags(u_long f, const char *format) 287{ 288 if (VarTerm) { 289 char name[33], *flags; 290 register struct bits *p = bits; 291 292 for (flags = name; p->b_mask; p++) 293 if (p->b_mask & f) 294 *flags++ = p->b_val; 295 *flags = '\0'; 296 fprintf(VarTerm, format, name); 297 } 298} 299 300static const char * 301Index2Nam(int idx) 302{ 303 static char ifs[200][6]; /* We could have 256 tun devices ! */ 304 static int nifs, debug_done; 305 306 if (!nifs) { 307 int mib[6], needed, len; 308 char *buf, *ptr, *end; 309 struct sockaddr_dl *dl; 310 struct if_msghdr *ifm; 311 312 mib[0] = CTL_NET; 313 mib[1] = PF_ROUTE; 314 mib[2] = 0; 315 mib[3] = 0; 316 mib[4] = NET_RT_IFLIST; 317 mib[5] = 0; 318 319 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) { 320 LogPrintf(LogERROR, "Index2Nam: sysctl: estimate: %s\n", strerror(errno)); 321 return "???"; 322 } 323 if ((buf = malloc(needed)) == NULL) 324 return "???"; 325 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) { 326 free(buf); 327 return "???"; 328 } 329 end = buf + needed; 330 331 for (ptr = buf; ptr < end; ptr += ifm->ifm_msglen) { 332 ifm = (struct if_msghdr *)ptr; 333 dl = (struct sockaddr_dl *)(ifm + 1); 334 if (ifm->ifm_index > 0 && ifm->ifm_index <= sizeof(ifs)/sizeof(ifs[0]) 335 && ifs[ifm->ifm_index-1][0] == '\0') { 336 if ((len = dl->sdl_nlen) > sizeof(ifs[0])-1) 337 len = sizeof(ifs[0])-1; 338 strncpy(ifs[ifm->ifm_index-1], dl->sdl_data, len); 339 ifs[ifm->ifm_index-1][len] = '\0'; 340 if (len && nifs < ifm->ifm_index) 341 nifs = ifm->ifm_index; 342 } else if (LogIsKept(LogDEBUG)) 343 LogPrintf(LogDEBUG, "Skipping out-of-range interface %d!\n", 344 ifm->ifm_index); 345 } 346 free(buf); 347 } 348 349 if (LogIsKept(LogDEBUG) && !debug_done) { 350 int f; 351 352 LogPrintf(LogDEBUG, "Found the following interfaces:\n"); 353 for (f = 0; f < nifs; f++) 354 if (*ifs[f] != '\0') 355 LogPrintf(LogDEBUG, " Index %d, name \"%s\"\n", f+1, ifs[f]); 356 debug_done = 1; 357 } 358 359 if (idx < 1 || idx > nifs || ifs[idx-1][0] == '\0') 360 return "???"; 361 362 return ifs[idx-1]; 363} 364 365int 366ShowRoute(struct cmdargs const *arg) 367{ 368 struct rt_msghdr *rtm; 369 struct sockaddr *sa_dst, *sa_gw, *sa_mask; 370 char *sp, *ep, *cp, *wp; 371 int needed; 372 int mib[6]; 373 374 if (!VarTerm) 375 return 1; 376 377 mib[0] = CTL_NET; 378 mib[1] = PF_ROUTE; 379 mib[2] = 0; 380 mib[3] = 0; 381 mib[4] = NET_RT_DUMP; 382 mib[5] = 0; 383 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) { 384 LogPrintf(LogERROR, "ShowRoute: sysctl: estimate: %s\n", strerror(errno)); 385 return (1); 386 } 387 if (needed < 0) 388 return (1); 389 sp = malloc(needed); 390 if (sp == NULL) 391 return (1); 392 if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) { 393 LogPrintf(LogERROR, "ShowRoute: sysctl: getroute: %s\n", strerror(errno)); 394 free(sp); 395 return (1); 396 } 397 ep = sp + needed; 398 399 fprintf(VarTerm, "%-20s%-20sFlags Netif\n", "Destination", "Gateway"); 400 for (cp = sp; cp < ep; cp += rtm->rtm_msglen) { 401 rtm = (struct rt_msghdr *) cp; 402 wp = (char *)(rtm+1); 403 404 if (rtm->rtm_addrs & RTA_DST) { 405 sa_dst = (struct sockaddr *)wp; 406 wp += sa_dst->sa_len; 407 } else 408 sa_dst = NULL; 409 410 if (rtm->rtm_addrs & RTA_GATEWAY) { 411 sa_gw = (struct sockaddr *)wp; 412 wp += sa_gw->sa_len; 413 } else 414 sa_gw = NULL; 415 416 if (rtm->rtm_addrs & RTA_NETMASK) { 417 sa_mask = (struct sockaddr *)wp; 418 wp += sa_mask->sa_len; 419 } else 420 sa_mask = NULL; 421 422 p_sockaddr(sa_dst, sa_mask, 20); 423 p_sockaddr(sa_gw, NULL, 20); 424 425 p_flags(rtm->rtm_flags, "%-6.6s "); 426 fprintf(VarTerm, "%s\n", Index2Nam(rtm->rtm_index)); 427 } 428 free(sp); 429 return 0; 430} 431 432/* 433 * Delete routes associated with our interface 434 */ 435void 436DeleteIfRoutes(int all) 437{ 438 struct rt_msghdr *rtm; 439 struct sockaddr *sa; 440 struct in_addr sa_dst, sa_none; 441 int needed, pass; 442 char *sp, *cp, *ep; 443 int mib[6]; 444 445 LogPrintf(LogDEBUG, "DeleteIfRoutes (%d)\n", IfIndex); 446 sa_none.s_addr = INADDR_ANY; 447 448 mib[0] = CTL_NET; 449 mib[1] = PF_ROUTE; 450 mib[2] = 0; 451 mib[3] = 0; 452 mib[4] = NET_RT_DUMP; 453 mib[5] = 0; 454 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) { 455 LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: estimate: %s\n", 456 strerror(errno)); 457 return; 458 } 459 if (needed < 0) 460 return; 461 462 sp = malloc(needed); 463 if (sp == NULL) 464 return; 465 466 if (sysctl(mib, 6, sp, &needed, NULL, 0) < 0) { 467 LogPrintf(LogERROR, "DeleteIfRoutes: sysctl: getroute: %s\n", 468 strerror(errno)); 469 free(sp); 470 return; 471 } 472 ep = sp + needed; 473 474 for (pass = 0; pass < 2; pass++) { 475 /* 476 * We do 2 passes. The first deletes all cloned routes. The second 477 * deletes all non-cloned routes. This is necessary to avoid 478 * potential errors from trying to delete route X after route Y where 479 * route X was cloned from route Y (which is no longer there). 480 */ 481 if (RTF_WASCLONED == 0 && pass == 0) 482 /* So we can't tell ! */ 483 continue; 484 for (cp = sp; cp < ep; cp += rtm->rtm_msglen) { 485 rtm = (struct rt_msghdr *) cp; 486 sa = (struct sockaddr *) (rtm + 1); 487 LogPrintf(LogDEBUG, "DeleteIfRoutes: addrs: %x, Netif: %d (%s)," 488 " flags: %x, dst: %s ?\n", rtm->rtm_addrs, rtm->rtm_index, 489 Index2Nam(rtm->rtm_index), rtm->rtm_flags, 490 inet_ntoa(((struct sockaddr_in *) sa)->sin_addr)); 491 if (rtm->rtm_addrs & RTA_DST && rtm->rtm_addrs & RTA_GATEWAY && 492 rtm->rtm_index == IfIndex && 493 (all || (rtm->rtm_flags & RTF_GATEWAY))) { 494 sa_dst.s_addr = ((struct sockaddr_in *)sa)->sin_addr.s_addr; 495 sa = (struct sockaddr *)((char *)sa + sa->sa_len); 496 if (sa->sa_family == AF_INET || sa->sa_family == AF_LINK) { 497 if ((pass == 0 && (rtm->rtm_flags & RTF_WASCLONED)) || 498 (pass == 1 && !(rtm->rtm_flags & RTF_WASCLONED))) { 499 LogPrintf(LogDEBUG, "DeleteIfRoutes: Remove it (pass %d)\n", pass); 500 OsSetRoute(RTM_DELETE, sa_dst, sa_none, sa_none); 501 } else 502 LogPrintf(LogDEBUG, "DeleteIfRoutes: Skip it (pass %d)\n", pass); 503 } else 504 LogPrintf(LogDEBUG, 505 "DeleteIfRoutes: Can't remove routes of %d family !\n", 506 sa->sa_family); 507 } 508 } 509 } 510 free(sp); 511} 512 513int 514GetIfIndex(char *name) 515{ 516 int idx; 517 const char *got; 518 519 idx = 1; 520 while (strcmp(got = Index2Nam(idx), "???")) 521 if (!strcmp(got, name)) 522 return IfIndex = idx; 523 else 524 idx++; 525 return -1; 526} 527 528struct in_addr 529ChooseHisAddr(const struct in_addr gw) 530{ 531 struct in_addr try; 532 int f; 533 534 for (f = 0; f < DefHisChoice.nItems; f++) { 535 try = iplist_next(&DefHisChoice); 536 LogPrintf(LogDEBUG, "ChooseHisAddr: Check item %d (%s)\n", 537 f, inet_ntoa(try)); 538 if (OsTrySetIpaddress(gw, try) == 0) { 539 LogPrintf(LogIPCP, "ChooseHisAddr: Selected IP address %s\n", 540 inet_ntoa(try)); 541 break; 542 } 543 } 544 545 if (f == DefHisChoice.nItems) { 546 LogPrintf(LogDEBUG, "ChooseHisAddr: All addresses in use !\n"); 547 try.s_addr = INADDR_ANY; 548 } 549 550 return try; 551} 552