iface.c revision 58032
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: head/usr.sbin/ppp/iface.c 58032 2000-03-14 01:46:44Z brian $ 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 77static int 78bitsinmask(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 94struct iface * 95iface_Create(const char *name) 96{ 97 int mib[6], s; 98 size_t needed; 99 char *buf, *ptr, *end; 100 struct if_msghdr *ifm; 101 struct ifa_msghdr *ifam; 102 struct sockaddr_dl *dl; 103 struct sockaddr *sa[RTAX_MAX]; 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, "iface_Create: sysctl: estimate: %s\n", 122 strerror(errno)); 123 close(s); 124 return NULL; 125 } 126 127 if ((buf = (char *)malloc(needed)) == NULL) { 128 fprintf(stderr, "iface_Create: malloc failed: %s\n", strerror(errno)); 129 close(s); 130 return NULL; 131 } 132 133 if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) { 134 fprintf(stderr, "iface_Create: sysctl: %s\n", strerror(errno)); 135 free(buf); 136 close(s); 137 return NULL; 138 } 139 140 ptr = buf; 141 end = buf + needed; 142 iface = NULL; 143 144 while (ptr < end && iface == NULL) { 145 ifm = (struct if_msghdr *)ptr; /* On if_msghdr */ 146 if (ifm->ifm_type != RTM_IFINFO) 147 break; 148 dl = (struct sockaddr_dl *)(ifm + 1); /* Single _dl at end */ 149 if (!strncmp(name, dl->sdl_data, dl->sdl_nlen)) { 150 iface = (struct iface *)malloc(sizeof *iface); 151 if (iface == NULL) { 152 fprintf(stderr, "iface_Create: malloc: %s\n", strerror(errno)); 153 return NULL; 154 } 155 iface->name = strdup(name); 156 iface->flags = ifm->ifm_flags; 157 iface->index = ifm->ifm_index; 158 iface->in_addrs = 0; 159 iface->in_addr = NULL; 160 } 161 ptr += ifm->ifm_msglen; /* First ifa_msghdr */ 162 for (; ptr < end; ptr += ifam->ifam_msglen) { 163 ifam = (struct ifa_msghdr *)ptr; /* Next if address */ 164 165 if (ifam->ifam_type != RTM_NEWADDR) /* finished this if */ 166 break; 167 168 if (iface != NULL && ifam->ifam_addrs & RTA_IFA) { 169 /* Found a configured interface ! */ 170 iface_ParseHdr(ifam, sa); 171 172 if (sa[RTAX_IFA] && sa[RTAX_IFA]->sa_family == AF_INET) { 173 /* Record the address */ 174 175 addr = (struct iface_addr *)realloc 176 (iface->in_addr, (iface->in_addrs + 1) * sizeof iface->in_addr[0]); 177 if (addr == NULL) 178 break; 179 iface->in_addr = addr; 180 181 addr += iface->in_addrs; 182 iface->in_addrs++; 183 184 addr->ifa = ((struct sockaddr_in *)sa[RTAX_IFA])->sin_addr; 185 186 if (sa[RTAX_BRD]) 187 addr->brd = ((struct sockaddr_in *)sa[RTAX_BRD])->sin_addr; 188 else 189 addr->brd.s_addr = INADDR_ANY; 190 191 if (sa[RTAX_NETMASK]) 192 addr->mask = ((struct sockaddr_in *)sa[RTAX_NETMASK])->sin_addr; 193 else 194 addr->mask.s_addr = INADDR_ANY; 195 196 addr->bits = bitsinmask(addr->mask); 197 } 198 } 199 } 200 } 201 202 free(buf); 203 close(s); 204 205 return iface; 206} 207 208static void 209iface_addr_Zap(const char *name, struct iface_addr *addr) 210{ 211 struct ifaliasreq ifra; 212 struct sockaddr_in *me, *peer; 213 int s; 214 215 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 216 if (s < 0) 217 log_Printf(LogERROR, "iface_addr_Zap: socket(): %s\n", strerror(errno)); 218 else { 219 memset(&ifra, '\0', sizeof ifra); 220 strncpy(ifra.ifra_name, name, sizeof ifra.ifra_name - 1); 221 me = (struct sockaddr_in *)&ifra.ifra_addr; 222 peer = (struct sockaddr_in *)&ifra.ifra_broadaddr; 223 me->sin_family = peer->sin_family = AF_INET; 224 me->sin_len = peer->sin_len = sizeof(struct sockaddr_in); 225 me->sin_addr = addr->ifa; 226 peer->sin_addr = addr->brd; 227 log_Printf(LogDEBUG, "Delete %s\n", inet_ntoa(addr->ifa)); 228 if (ID0ioctl(s, SIOCDIFADDR, &ifra) < 0) 229 log_Printf(LogWARN, "iface_addr_Zap: ioctl(SIOCDIFADDR, %s): %s\n", 230 inet_ntoa(addr->ifa), strerror(errno)); 231 close(s); 232 } 233} 234 235void 236iface_inClear(struct iface *iface, int how) 237{ 238 int n, addrs; 239 240 if (iface->in_addrs) { 241 addrs = n = how == IFACE_CLEAR_ALL ? 0 : 1; 242 for (; n < iface->in_addrs; n++) 243 iface_addr_Zap(iface->name, iface->in_addr + n); 244 245 iface->in_addrs = addrs; 246 /* Don't bother realloc()ing - we have little to gain */ 247 } 248} 249 250int 251iface_inAdd(struct iface *iface, struct in_addr ifa, struct in_addr mask, 252 struct in_addr brd, int how) 253{ 254 int slot, s, chg; 255 struct ifaliasreq ifra; 256 struct sockaddr_in *me, *peer, *msk; 257 struct iface_addr *addr; 258 259 for (slot = 0; slot < iface->in_addrs; slot++) 260 if (iface->in_addr[slot].ifa.s_addr == ifa.s_addr) { 261 if (how & IFACE_FORCE_ADD) 262 break; 263 else 264 /* errno = EEXIST; */ 265 return 0; 266 } 267 268 addr = (struct iface_addr *)realloc 269 (iface->in_addr, (iface->in_addrs + 1) * sizeof iface->in_addr[0]); 270 if (addr == NULL) { 271 log_Printf(LogERROR, "iface_inAdd: realloc: %s\n", strerror(errno)); 272 return 0; 273 } 274 iface->in_addr = addr; 275 276 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 277 if (s < 0) { 278 log_Printf(LogERROR, "iface_inAdd: socket(): %s\n", strerror(errno)); 279 return 0; 280 } 281 282 /* 283 * We've gotta be careful here. If we try to add an address with the 284 * same destination as an existing interface, nothing will work. 285 * Instead, we tweak all previous address entries that match the 286 * to-be-added destination to 255.255.255.255 (w/ a similar netmask). 287 * There *may* be more than one - if the user has ``iface add''ed 288 * stuff previously. 289 */ 290 for (chg = 0; chg < iface->in_addrs; chg++) { 291 if ((iface->in_addr[chg].brd.s_addr == brd.s_addr && 292 brd.s_addr != INADDR_BROADCAST) || chg == slot) { 293 memset(&ifra, '\0', sizeof ifra); 294 strncpy(ifra.ifra_name, iface->name, sizeof ifra.ifra_name - 1); 295 me = (struct sockaddr_in *)&ifra.ifra_addr; 296 msk = (struct sockaddr_in *)&ifra.ifra_mask; 297 peer = (struct sockaddr_in *)&ifra.ifra_broadaddr; 298 me->sin_family = msk->sin_family = peer->sin_family = AF_INET; 299 me->sin_len = msk->sin_len = peer->sin_len = sizeof(struct sockaddr_in); 300 me->sin_addr = iface->in_addr[chg].ifa; 301 msk->sin_addr = iface->in_addr[chg].mask; 302 peer->sin_addr = iface->in_addr[chg].brd; 303 log_Printf(LogDEBUG, "Delete %s\n", inet_ntoa(me->sin_addr)); 304 ID0ioctl(s, SIOCDIFADDR, &ifra); /* Don't care if it fails... */ 305 if (chg != slot) { 306 peer->sin_addr.s_addr = iface->in_addr[chg].brd.s_addr = 307 msk->sin_addr.s_addr = iface->in_addr[chg].mask.s_addr = 308 INADDR_BROADCAST; 309 iface->in_addr[chg].bits = 32; 310 log_Printf(LogDEBUG, "Add %s -> 255.255.255.255\n", 311 inet_ntoa(me->sin_addr)); 312 if (ID0ioctl(s, SIOCAIFADDR, &ifra) < 0 && errno != EEXIST) { 313 /* Oops - that's bad(ish) news ! We've lost an alias ! */ 314 log_Printf(LogERROR, "iface_inAdd: ioctl(SIOCAIFADDR): %s: %s\n", 315 inet_ntoa(me->sin_addr), strerror(errno)); 316 iface->in_addrs--; 317 bcopy(iface->in_addr + chg + 1, iface->in_addr + chg, 318 (iface->in_addrs - chg) * sizeof iface->in_addr[0]); 319 if (slot > chg) 320 slot--; 321 chg--; 322 } 323 } 324 } 325 } 326 327 memset(&ifra, '\0', sizeof ifra); 328 strncpy(ifra.ifra_name, iface->name, sizeof ifra.ifra_name - 1); 329 me = (struct sockaddr_in *)&ifra.ifra_addr; 330 msk = (struct sockaddr_in *)&ifra.ifra_mask; 331 peer = (struct sockaddr_in *)&ifra.ifra_broadaddr; 332 me->sin_family = msk->sin_family = peer->sin_family = AF_INET; 333 me->sin_len = msk->sin_len = peer->sin_len = sizeof(struct sockaddr_in); 334 me->sin_addr = ifa; 335 msk->sin_addr = mask; 336 peer->sin_addr = brd; 337 338 if (log_IsKept(LogDEBUG)) { 339 char buf[16]; 340 341 strncpy(buf, inet_ntoa(brd), sizeof buf-1); 342 buf[sizeof buf - 1] = '\0'; 343 log_Printf(LogDEBUG, "Add %s -> %s\n", inet_ntoa(ifa), buf); 344 } 345 346 /* An EEXIST failure w/ brd == INADDR_BROADCAST is ok (and works!) */ 347 if (ID0ioctl(s, SIOCAIFADDR, &ifra) < 0 && 348 (brd.s_addr != INADDR_BROADCAST || errno != EEXIST)) { 349 log_Printf(LogERROR, "iface_inAdd: ioctl(SIOCAIFADDR): %s: %s\n", 350 inet_ntoa(ifa), strerror(errno)); 351 ID0ioctl(s, SIOCDIFADDR, &ifra); /* EEXIST ? */ 352 close(s); 353 return 0; 354 } 355 close(s); 356 357 if (slot == iface->in_addrs) { 358 /* We're adding a new interface address */ 359 360 if (how & IFACE_ADD_FIRST) { 361 /* Stuff it at the start of our list */ 362 slot = 0; 363 bcopy(iface->in_addr, iface->in_addr + 1, 364 iface->in_addrs * sizeof iface->in_addr[0]); 365 } 366 367 iface->in_addrs++; 368 } else if (how & IFACE_ADD_FIRST) { 369 /* Shift it up to the first slot */ 370 bcopy(iface->in_addr, iface->in_addr + 1, slot * sizeof iface->in_addr[0]); 371 slot = 0; 372 } 373 374 iface->in_addr[slot].ifa = ifa; 375 iface->in_addr[slot].mask = mask; 376 iface->in_addr[slot].brd = brd; 377 iface->in_addr[slot].bits = bitsinmask(iface->in_addr[slot].mask); 378 379 return 1; 380} 381 382int 383iface_inDelete(struct iface *iface, struct in_addr ip) 384{ 385 int n; 386 387 for (n = 0; n < iface->in_addrs; n++) 388 if (iface->in_addr[n].ifa.s_addr == ip.s_addr) { 389 iface_addr_Zap(iface->name, iface->in_addr + n); 390 bcopy(iface->in_addr + n + 1, iface->in_addr + n, 391 (iface->in_addrs - n - 1) * sizeof iface->in_addr[0]); 392 iface->in_addrs--; 393 return 1; 394 } 395 396 return 0; 397} 398 399#define IFACE_ADDFLAGS 1 400#define IFACE_DELFLAGS 2 401 402static int 403iface_ChangeFlags(struct iface *iface, int flags, int how) 404{ 405 struct ifreq ifrq; 406 int s; 407 408 s = ID0socket(AF_INET, SOCK_DGRAM, 0); 409 if (s < 0) { 410 log_Printf(LogERROR, "iface_ChangeFlags: socket: %s\n", strerror(errno)); 411 return 0; 412 } 413 414 memset(&ifrq, '\0', sizeof ifrq); 415 strncpy(ifrq.ifr_name, iface->name, sizeof ifrq.ifr_name - 1); 416 ifrq.ifr_name[sizeof ifrq.ifr_name - 1] = '\0'; 417 if (ID0ioctl(s, SIOCGIFFLAGS, &ifrq) < 0) { 418 log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCGIFFLAGS): %s\n", 419 strerror(errno)); 420 close(s); 421 return 0; 422 } 423 424 if (how == IFACE_ADDFLAGS) 425 ifrq.ifr_flags |= flags; 426 else 427 ifrq.ifr_flags &= ~flags; 428 429 if (ID0ioctl(s, SIOCSIFFLAGS, &ifrq) < 0) { 430 log_Printf(LogERROR, "iface_ChangeFlags: ioctl(SIOCSIFFLAGS): %s\n", 431 strerror(errno)); 432 close(s); 433 return 0; 434 } 435 close(s); 436 437 return 1; /* Success */ 438} 439 440int 441iface_SetFlags(struct iface *iface, int flags) 442{ 443 return iface_ChangeFlags(iface, flags, IFACE_ADDFLAGS); 444} 445 446int 447iface_ClearFlags(struct iface *iface, int flags) 448{ 449 return iface_ChangeFlags(iface, flags, IFACE_DELFLAGS); 450} 451 452void 453iface_Destroy(struct iface *iface) 454{ 455 /* 456 * iface_Clear(iface, IFACE_CLEAR_ALL) must be called manually 457 * if that's what the user wants. It's better to leave the interface 458 * allocated so that existing connections can continue to work. 459 */ 460 461 if (iface != NULL) { 462 free(iface->name); 463 free(iface->in_addr); 464 free(iface); 465 } 466} 467 468#define if_entry(x) { IFF_##x, #x } 469 470struct { 471 int flag; 472 const char *value; 473} if_flags[] = { 474 if_entry(UP), 475 if_entry(BROADCAST), 476 if_entry(DEBUG), 477 if_entry(LOOPBACK), 478 if_entry(POINTOPOINT), 479 if_entry(RUNNING), 480 if_entry(NOARP), 481 if_entry(PROMISC), 482 if_entry(ALLMULTI), 483 if_entry(OACTIVE), 484 if_entry(SIMPLEX), 485 if_entry(LINK0), 486 if_entry(LINK1), 487 if_entry(LINK2), 488 if_entry(MULTICAST), 489 { 0, "???" } 490}; 491 492int 493iface_Show(struct cmdargs const *arg) 494{ 495 struct iface *iface = arg->bundle->iface, *current; 496 int f, flags; 497 498 current = iface_Create(iface->name); 499 flags = iface->flags = current->flags; 500 iface_Destroy(current); 501 502 prompt_Printf(arg->prompt, "%s (idx %d) <", iface->name, iface->index); 503 for (f = 0; f < sizeof if_flags / sizeof if_flags[0]; f++) 504 if ((if_flags[f].flag & flags) || (!if_flags[f].flag && flags)) { 505 prompt_Printf(arg->prompt, "%s%s", flags == iface->flags ? "" : ",", 506 if_flags[f].value); 507 flags &= ~if_flags[f].flag; 508 } 509 prompt_Printf(arg->prompt, "> has %d address%s:\n", iface->in_addrs, 510 iface->in_addrs == 1 ? "" : "es"); 511 512 for (f = 0; f < iface->in_addrs; f++) { 513 prompt_Printf(arg->prompt, " %s", inet_ntoa(iface->in_addr[f].ifa)); 514 if (iface->in_addr[f].bits >= 0) 515 prompt_Printf(arg->prompt, "/%d", iface->in_addr[f].bits); 516 if (iface->flags & IFF_POINTOPOINT) 517 prompt_Printf(arg->prompt, " -> %s", inet_ntoa(iface->in_addr[f].brd)); 518 else if (iface->flags & IFF_BROADCAST) 519 prompt_Printf(arg->prompt, " broadcast %s", 520 inet_ntoa(iface->in_addr[f].brd)); 521 if (iface->in_addr[f].bits < 0) 522 prompt_Printf(arg->prompt, " (mask %s)", 523 inet_ntoa(iface->in_addr[f].mask)); 524 prompt_Printf(arg->prompt, "\n"); 525 } 526 527 return 0; 528} 529 530void 531iface_ParseHdr(struct ifa_msghdr *ifam, struct sockaddr *sa[RTAX_MAX]) 532{ 533 char *wp; 534 int rtax; 535 536 wp = (char *)(ifam + 1); 537 538 for (rtax = 0; rtax < RTAX_MAX; rtax++) 539 if (ifam->ifam_addrs & (1 << rtax)) { 540 sa[rtax] = (struct sockaddr *)wp; 541 wp += ROUNDUP(sa[rtax]->sa_len); 542 } else 543 sa[rtax] = NULL; 544} 545