1 /*- 2 * Copyright (c) 1998 Brian Somers <brian@Awfulhak.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/socket.h> 31 #include <netinet/in.h> 32 #include <net/if.h> 33 #include <net/if_dl.h> 34 #include <net/route.h> 35 #include <arpa/inet.h> 36 #include <netinet/in_systm.h> 37 #include <netinet/ip.h> 38 #include <sys/un.h> 39 40 #include <errno.h> 41 #include <string.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <sys/ioctl.h> 45 #include <sys/sysctl.h> 46 #include <termios.h> 47 #include <unistd.h> 48 49 #include "layer.h" 50 #include "defs.h" 51 #include "command.h" 52 #include "mbuf.h" 53 #include "log.h" 54 #include "id.h" 55 #include "timer.h" 56 #include "fsm.h" 57 #include "iplist.h" 58 #include "lqr.h" 59 #include "hdlc.h" 60 #include "throughput.h" 61 #include "slcompress.h" 62 #include "descriptor.h" 63 #include "ipcp.h" 64 #include "filter.h" 65 #include "lcp.h" 66 #include "ccp.h" 67 #include "link.h" 68 #include "mp.h" 69 #ifndef NORADIUS 70 #include "radius.h" 71 #endif 72 #include "bundle.h" 73 #include "prompt.h" 74 #include "iface.h" 75 76 77 static int 78 bitsinmask(struct in_addr mask) 79 { 80 u_int32_t bitmask, maskaddr; 81 int bits; 82 83 bitmask = 0xffffffff; 84 maskaddr = ntohl(mask.s_addr); 85 for (bits = 32; bits >= 0; bits--) { 86 if (maskaddr == bitmask) 87 break; 88 bitmask &= ~(1 << (32 - bits)); 89 } 90 91 return bits; 92 } 93 94 struct iface * 95 iface_Create(const char *name) 96 { 97 int mib[6], i, s; 98 size_t needed; 99 char *buf, *ptr, *end, *cp, *lim; 100 struct if_msghdr *ifm; 101 struct ifa_msghdr *ifam; 102 struct sockaddr_dl *dl; 103 struct rt_addrinfo rti; 104 struct iface *iface; 105 struct iface_addr *addr; 106 107 s = socket(AF_INET, SOCK_DGRAM, 0); 108 if (s < 0) { 109 fprintf(stderr, "iface_Create: socket(): %s\n", strerror(errno)); 110 return NULL; 111 } 112 113 mib[0] = CTL_NET; 114 mib[1] = PF_ROUTE; 115 mib[2] = 0; 116 mib[3] = 0; 117 mib[4] = NET_RT_IFLIST; 118 mib[5] = 0; 119 120 if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) { 121 fprintf(stderr, "clean: sysctl: estimate: %s\n", 122 strerror(errno)); 123 close(s); 124 return NULL; 125 } 126 127 if ((buf = (char *)malloc(needed)) == NULL) { 128 close(s); 129 return NULL; 130 } 131 132 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) { 133 free(buf); 134 close(s); 135 return NULL; 136 } 137 138 ptr = buf; 139 end = buf + needed; 140 iface = NULL; 141 142 while (ptr < end && iface == NULL) { 143 ifm = (struct if_msghdr *)ptr; /* On if_msghdr */ 144 if (ifm->ifm_type != RTM_IFINFO) 145 break; 146 dl = (struct sockaddr_dl *)(ifm + 1); /* Single _dl at end */ 147 if (!strncmp(name, dl->sdl_data, dl->sdl_nlen)) { 148 iface = (struct iface *)malloc(sizeof *iface); 149 if (iface == NULL) { 150 fprintf(stderr, "iface_Create: malloc: %s\n", strerror(errno)); 151 return NULL; 152 } 153 iface->name = strdup(name); 154 iface->flags = ifm->ifm_flags; 155 iface->index = ifm->ifm_index; 156 iface->in_addrs = 0; 157 iface->in_addr = NULL; 158 } 159 ptr += ifm->ifm_msglen; /* First ifa_msghdr */ 160 for (; ptr < end; ptr += ifam->ifam_msglen) { 161 ifam = (struct ifa_msghdr *)ptr; /* Next if address */ 162 163 if (ifam->ifam_type != RTM_NEWADDR) /* finished this if */ 164 break; 165 166 if (iface == NULL) /* Keep wading */ 167 continue; 168 169 /* Found an address ! */ 170 171 if (ifam->ifam_addrs & (1 << RTAX_IFA)) { 172 /* *And* it's configured ! */ 173 rti.rti_addrs = ifam->ifam_addrs; 174 lim = (char *)ifam + ifam->ifam_msglen; 175 cp = (char *)(ifam + 1); 176 memset(rti.rti_info, '\0', sizeof(rti.rti_info)); 177 for (i = 0; i < RTAX_MAX && cp < lim; i++) { 178 if ((rti.rti_addrs & (1 << i)) == 0) 179 continue; 180 rti.rti_info[i] = (struct sockaddr *)cp; 181 #define ROUNDUP(x) \ 182 ((x) > 0 ? (1 + (((x) - 1) | (sizeof(long) - 1))) : sizeof(long)) 183 cp += ROUNDUP(rti.rti_info[i]->sa_len); 184 } 185 186 if (rti.rti_info[RTAX_IFA] && 187 rti.rti_info[RTAX_IFA]->sa_family == AF_INET) { 188 /* Record the iface address rti */ 189 190 addr = (struct iface_addr *)realloc 191 (iface->in_addr, (iface->in_addrs + 1) * sizeof iface->in_addr[0]); 192 if (addr == NULL) 193 break; 194 iface->in_addr = addr; 195 196 addr += iface->in_addrs; 197 iface->in_addrs++; 198 199 addr->ifa.s_addr = ((struct sockaddr_in *)rti.rti_info[RTAX_IFA])-> 200 sin_addr.s_addr; 201 addr->brd.s_addr = rti.rti_info[RTAX_BRD] ? 202 ((struct sockaddr_in *)rti.rti_info[RTAX_BRD])->sin_addr.s_addr : 203 INADDR_ANY; 204 addr->mask.s_addr = rti.rti_info[RTAX_NETMASK] ? 205 ((struct sockaddr_in *)rti.rti_info[RTAX_NETMASK])->sin_addr.s_addr: 206 INADDR_ANY; 207 208 addr->bits = bitsinmask(addr->mask); 209 } 210 } 211 } 212 } 213 214 free(buf); 215 close(s); 216 217 return iface; 218 } 219 220 static void 221 iface_addr_Zap(const char *name, struct iface_addr *addr) 222 { 223 struct ifaliasreq ifra; 224 struct sockaddr_in *me, *peer; 225 int s; 226 227 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 228 if (s < 0) 229 log_Printf(LogERROR, "iface_addr_Zap: socket(): %s\n", strerror(errno)); 230 else { 231 memset(&ifra, '\0', sizeof ifra); 232 strncpy(ifra.ifra_name, name, sizeof ifra.ifra_name - 1); 233 me = (struct sockaddr_in *)&ifra.ifra_addr; 234 peer = (struct sockaddr_in *)&ifra.ifra_broadaddr; 235 me->sin_family = peer->sin_family = AF_INET; 236 me->sin_len = peer->sin_len = sizeof(struct sockaddr_in); 237 me->sin_addr = addr->ifa; 238 peer->sin_addr = addr->brd; 239 log_Printf(LogDEBUG, "Delete %s\n", inet_ntoa(addr->ifa)); 240 if (ID0ioctl(s, SIOCDIFADDR, &ifra) < 0) 241 log_Printf(LogWARN, "iface_addr_Zap: ioctl(SIOCDIFADDR, %s): %s\n", 242 inet_ntoa(addr->ifa), strerror(errno)); 243 close(s); 244 } 245 } 246 247 void 248 iface_inClear(struct iface *iface, int how) 249 { 250 int n, addrs; 251 252 addrs = n = how == IFACE_CLEAR_ALL ? 0 : 1; 253 for (; n < iface->in_addrs; n++) 254 iface_addr_Zap(iface->name, iface->in_addr + n); 255 256 iface->in_addrs = addrs; 257 /* Don't bother realloc()ing - we have little to gain */ 258 } 259 260 int 261 iface_inAdd(struct iface *iface, struct in_addr ifa, struct in_addr mask, 262 struct in_addr brd, int how) 263 { 264 int slot, s, chg; 265 struct ifaliasreq ifra; 266 struct sockaddr_in *me, *peer, *msk; 267 struct iface_addr *addr; 268 269 for (slot = 0; slot < iface->in_addrs; slot++) 270 if (iface->in_addr[slot].ifa.s_addr == ifa.s_addr) { 271 if (how & IFACE_FORCE_ADD) 272 break; 273 else 274 /* errno = EEXIST; */ 275 return 0; 276 } 277 278 addr = (struct iface_addr *)realloc 279 (iface->in_addr, (iface->in_addrs + 1) * sizeof iface->in_addr[0]); 280 if (addr == NULL) { 281 log_Printf(LogERROR, "iface_inAdd: realloc: %s\n", strerror(errno)); 282 return 0; 283 } 284 iface->in_addr = addr; 285 286 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 287 if (s < 0) { 288 log_Printf(LogERROR, "iface_inAdd: socket(): %s\n", strerror(errno)); 289 return 0; 290 } 291 292 /* 293 * We've gotta be careful here. If we try to add an address with the 294 * same destination as an existing interface, nothing will work. 295 * Instead, we tweak all previous address entries that match the 296 * to-be-added destination to 255.255.255.255 (w/ a similar netmask). 297 * There *may* be more than one - if the user has ``iface add''ed 298 * stuff previously. 299 */ 300 for (chg = 0; chg < iface->in_addrs; chg++) { 301 if ((iface->in_addr[chg].brd.s_addr == brd.s_addr && 302 brd.s_addr != INADDR_BROADCAST) || chg == slot) { 303 memset(&ifra, '\0', sizeof ifra); 304 strncpy(ifra.ifra_name, iface->name, sizeof ifra.ifra_name - 1); 305 me = (struct sockaddr_in *)&ifra.ifra_addr; 306 msk = (struct sockaddr_in *)&ifra.ifra_mask; 307 peer = (struct sockaddr_in *)&ifra.ifra_broadaddr; 308 me->sin_family = msk->sin_family = peer->sin_family = AF_INET; 309 me->sin_len = msk->sin_len = peer->sin_len = sizeof(struct sockaddr_in); 310 me->sin_addr = iface->in_addr[chg].ifa; 311 msk->sin_addr = iface->in_addr[chg].mask; 312 peer->sin_addr = iface->in_addr[chg].brd; 313 log_Printf(LogDEBUG, "Delete %s\n", inet_ntoa(me->sin_addr)); 314 ID0ioctl(s, SIOCDIFADDR, &ifra); /* Don't care if it fails... */ 315 if (chg != slot) { 316 peer->sin_addr.s_addr = iface->in_addr[chg].brd.s_addr = 317 msk->sin_addr.s_addr = iface->in_addr[chg].mask.s_addr = 318 INADDR_BROADCAST; 319 iface->in_addr[chg].bits = 32; 320 log_Printf(LogDEBUG, "Add %s -> 255.255.255.255\n", 321 inet_ntoa(me->sin_addr)); 322 if (ID0ioctl(s, SIOCAIFADDR, &ifra) < 0 && errno != EEXIST) { 323 /* Oops - that's bad(ish) news ! We've lost an alias ! */ 324 log_Printf(LogERROR, "iface_inAdd: ioctl(SIOCAIFADDR): %s: %s\n", 325 inet_ntoa(me->sin_addr), strerror(errno)); 326 iface->in_addrs--; 327 bcopy(iface->in_addr + chg + 1, iface->in_addr + chg, 328 (iface->in_addrs - chg) * sizeof iface->in_addr[0]); 329 if (slot > chg) 330 slot--; 331 chg--; 332 } 333 } 334 } 335 } 336 337 memset(&ifra, '\0', sizeof ifra); 338 strncpy(ifra.ifra_name, iface->name, sizeof ifra.ifra_name - 1); 339 me = (struct sockaddr_in *)&ifra.ifra_addr; 340 msk = (struct sockaddr_in *)&ifra.ifra_mask; 341 peer = (struct sockaddr_in *)&ifra.ifra_broadaddr; 342 me->sin_family = msk->sin_family = peer->sin_family = AF_INET; 343 me->sin_len = msk->sin_len = peer->sin_len = sizeof(struct sockaddr_in); 344 me->sin_addr = ifa; 345 msk->sin_addr = mask; 346 peer->sin_addr = brd; 347 348 if (log_IsKept(LogDEBUG)) { 349 char buf[16]; 350 351 strncpy(buf, inet_ntoa(brd), sizeof buf-1); 352 buf[sizeof buf - 1] = '\0'; 353 log_Printf(LogDEBUG, "Add %s -> %s\n", inet_ntoa(ifa), buf); 354 } 355 356 /* An EEXIST failure w/ brd == INADDR_BROADCAST is ok (and works!) */ 357 if (ID0ioctl(s, SIOCAIFADDR, &ifra) < 0 && 358 (brd.s_addr != INADDR_BROADCAST || errno != EEXIST)) { 359 log_Printf(LogERROR, "iface_inAdd: ioctl(SIOCAIFADDR): %s: %s\n", 360 inet_ntoa(ifa), strerror(errno)); 361 ID0ioctl(s, SIOCDIFADDR, &ifra); /* EEXIST ? */ 362 close(s); 363 return 0; 364 } 365 close(s); 366 367 if (slot == iface->in_addrs) { 368 /* We're adding a new interface address */ 369 370 if (how & IFACE_ADD_FIRST) { 371 /* Stuff it at the start of our list */ 372 slot = 0; 373 bcopy(iface->in_addr, iface->in_addr + 1, 374 iface->in_addrs * sizeof iface->in_addr[0]); 375 } 376 377 iface->in_addrs++; 378 } else if (how & IFACE_ADD_FIRST) { 379 /* Shift it up to the first slot */ 380 bcopy(iface->in_addr, iface->in_addr + 1, slot * sizeof iface->in_addr[0]); 381 slot = 0; 382 } 383 384 iface->in_addr[slot].ifa = ifa; 385 iface->in_addr[slot].mask = mask; 386 iface->in_addr[slot].brd = brd; 387 iface->in_addr[slot].bits = bitsinmask(iface->in_addr[slot].mask); 388 389 return 1; 390 } 391 392 int 393 iface_inDelete(struct iface *iface, struct in_addr ip) 394 { 395 int n; 396 397 for (n = 0; n < iface->in_addrs; n++) 398 if (iface->in_addr[n].ifa.s_addr == ip.s_addr) { 399 iface_addr_Zap(iface->name, iface->in_addr + n); 400 bcopy(iface->in_addr + n + 1, iface->in_addr + n, 401 (iface->in_addrs - n - 1) * sizeof iface->in_addr[0]); 402 iface->in_addrs--; 403 return 1; 404 } 405 406 return 0; 407 } 408 409 #define IFACE_ADDFLAGS 1 410 #define IFACE_DELFLAGS 2 411 412 static int 413 iface_ChangeFlags(struct iface *iface, int flags, int how) 414 { 415 struct ifreq ifrq; 416 int s; 417 418 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 419 if (s < 0) { 420 log_Printf(LogERROR, "iface_ClearFlags: socket: %s\n", strerror(errno)); 421 return 0; 422 } 423 424 memset(&ifrq, '\0', sizeof ifrq); 425 strncpy(ifrq.ifr_name, iface->name, sizeof ifrq.ifr_name - 1); 426 ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0'; 427 if (ID0ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) { 428 log_Printf(LogERROR, "iface_ClearFlags: ioctl(SIOCGIFFLAGS): %s\n", 429 strerror(errno)); 430 close(s); 431 return 0; 432 } 433 434 if (how == IFACE_ADDFLAGS) 435 ifrq.ifr_flags |= flags; 436 else 437 ifrq.ifr_flags &= ~flags; 438 439 if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) { 440 log_Printf(LogERROR, "iface_ClearFlags: ioctl(SIOCSIFFLAGS): %s\n", 441 strerror(errno)); 442 close(s); 443 return 0; 444 } 445 close(s); 446 447 return 1; /* Success */ 448 } 449 450 int 451 iface_SetFlags(struct iface *iface, int flags) 452 { 453 return iface_ChangeFlags(iface, flags, IFACE_ADDFLAGS); 454 } 455 456 int 457 iface_ClearFlags(struct iface *iface, int flags) 458 { 459 return iface_ChangeFlags(iface, flags, IFACE_DELFLAGS); 460 } 461 462 void 463 iface_Destroy(struct iface *iface) 464 { 465 /* 466 * iface_Clear(iface, IFACE_CLEAR_ALL) must be called manually 467 * if that's what the user wants. It's better to leave the interface 468 * allocated so that existing connections can continue to work. 469 */ 470 471 if (iface != NULL) { 472 free(iface->name); 473 free(iface->in_addr); 474 free(iface); 475 } 476 } 477 478 #define if_entry(x) { IFF_##x, #x } 479 480 struct { 481 int flag; 482 const char *value; 483 } if_flags[] = { 484 if_entry(UP), 485 if_entry(BROADCAST), 486 if_entry(DEBUG), 487 if_entry(LOOPBACK), 488 if_entry(POINTOPOINT), 489 if_entry(RUNNING), 490 if_entry(NOARP), 491 if_entry(PROMISC), 492 if_entry(ALLMULTI), 493 if_entry(OACTIVE), 494 if_entry(SIMPLEX), 495 if_entry(LINK0), 496 if_entry(LINK1), 497 if_entry(LINK2), 498 if_entry(MULTICAST), 499 { 0, "???" } 500 }; 501 502 int 503 iface_Show(struct cmdargs const *arg) 504 { 505 struct iface *iface = arg->bundle->iface, *current; 506 int f, flags; 507 508 current = iface_Create(iface->name); 509 flags = iface->flags = current->flags; 510 iface_Destroy(current); 511 512 prompt_Printf(arg->prompt, "%s (idx %d) <", iface->name, iface->index); 513 for (f = 0; f < sizeof if_flags / sizeof if_flags[0]; f++) 514 if ((if_flags[f].flag & flags) || (!if_flags[f].flag && flags)) { 515 prompt_Printf(arg->prompt, "%s%s", flags == iface->flags ? "" : ",", 516 if_flags[f].value); 517 flags &= ~if_flags[f].flag; 518 } 519 prompt_Printf(arg->prompt, "> has %d address%s:\n", iface->in_addrs, 520 iface->in_addrs == 1 ? "" : "es"); 521 522 for (f = 0; f < iface->in_addrs; f++) { 523 prompt_Printf(arg->prompt, " %s", inet_ntoa(iface->in_addr[f].ifa)); 524 if (iface->in_addr[f].bits >= 0) 525 prompt_Printf(arg->prompt, "/%d", iface->in_addr[f].bits); 526 if (iface->flags & IFF_POINTOPOINT) 527 prompt_Printf(arg->prompt, " -> %s", inet_ntoa(iface->in_addr[f].brd)); 528 else if (iface->flags & IFF_BROADCAST) 529 prompt_Printf(arg->prompt, " broadcast %s", 530 inet_ntoa(iface->in_addr[f].brd)); 531 if (iface->in_addr[f].bits < 0) 532 prompt_Printf(arg->prompt, " (mask %s)", 533 inet_ntoa(iface->in_addr[f].mask)); 534 prompt_Printf(arg->prompt, "\n"); 535 } 536 537 return 0; 538 } 539