1 /* 2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project. 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 * 3. Neither the name of the project nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * $FreeBSD$ 30 */ 31 32 #include <sys/param.h> 33 #include <sys/socket.h> 34 #include <sys/sysctl.h> 35 #include <sys/ioctl.h> 36 #include <net/if.h> 37 #include <net/if_types.h> 38 #include <net/ethernet.h> 39 #include <net/route.h> 40 #include <net/if_dl.h> 41 #include <netinet/in.h> 42 #include <netinet/icmp6.h> 43 #include <unistd.h> 44 #include <errno.h> 45 #include <stdlib.h> 46 #include <string.h> 47 #include <syslog.h> 48 #include "rtadvd.h" 49 #include "if.h" 50 51 #define ROUNDUP(a, size) \ 52 (((a) & ((size)-1)) ? (1 + ((a) | ((size)-1))) : (a)) 53 54 #define NEXT_SA(ap) (ap) = (struct sockaddr *) \ 55 ((caddr_t)(ap) + ((ap)->sa_len ? ROUNDUP((ap)->sa_len,\ 56 sizeof(u_long)) :\ 57 sizeof(u_long))) 58 59 struct if_msghdr **iflist; 60 int iflist_init_ok; 61 size_t ifblock_size; 62 char *ifblock; 63 64 static void get_iflist __P((char **buf, size_t *size)); 65 static void parse_iflist __P((struct if_msghdr ***ifmlist_p, char *buf, 66 size_t bufsize)); 67 68 static void 69 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info) 70 { 71 int i; 72 73 for (i = 0; i < RTAX_MAX; i++) { 74 if (addrs & (1 << i)) { 75 rti_info[i] = sa; 76 NEXT_SA(sa); 77 } 78 else 79 rti_info[i] = NULL; 80 } 81 } 82 83 struct sockaddr_dl * 84 if_nametosdl(char *name) 85 { 86 int mib[6] = {CTL_NET, AF_ROUTE, 0, 0, NET_RT_IFLIST, 0}; 87 char *buf, *next, *lim; 88 size_t len; 89 struct if_msghdr *ifm; 90 struct sockaddr *sa, *rti_info[RTAX_MAX]; 91 struct sockaddr_dl *sdl = NULL, *ret_sdl; 92 93 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 94 return(NULL); 95 if ((buf = malloc(len)) == NULL) 96 return(NULL); 97 if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) { 98 free(buf); 99 return(NULL); 100 } 101 102 lim = buf + len; 103 for (next = buf; next < lim; next += ifm->ifm_msglen) { 104 ifm = (struct if_msghdr *)next; 105 if (ifm->ifm_type == RTM_IFINFO) { 106 sa = (struct sockaddr *)(ifm + 1); 107 get_rtaddrs(ifm->ifm_addrs, sa, rti_info); 108 if ((sa = rti_info[RTAX_IFP]) != NULL) { 109 if (sa->sa_family == AF_LINK) { 110 sdl = (struct sockaddr_dl *)sa; 111 if (strncmp(&sdl->sdl_data[0], 112 name, 113 sdl->sdl_nlen) == 0) { 114 break; 115 } 116 } 117 } 118 } 119 } 120 if (next == lim) { 121 /* search failed */ 122 free(buf); 123 return(NULL); 124 } 125 126 if ((ret_sdl = malloc(sdl->sdl_len)) == NULL) 127 return(NULL); 128 memcpy((caddr_t)ret_sdl, (caddr_t)sdl, sdl->sdl_len); 129 return(ret_sdl); 130 } 131 132 int 133 if_getmtu(char *name) 134 { 135 struct ifreq ifr; 136 int s; 137 138 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) 139 return(0); 140 141 ifr.ifr_addr.sa_family = AF_INET6; 142 strncpy(ifr.ifr_name, name, sizeof(ifr.ifr_name)); 143 if (ioctl(s, SIOCGIFMTU, (caddr_t)&ifr) < 0) { 144 close(s); 145 return(0); 146 } 147 148 close(s); 149 150 return(ifr.ifr_mtu); 151 } 152 153 /* give interface index and its old flags, then new flags returned */ 154 int 155 if_getflags(int ifindex, int oifflags) 156 { 157 struct ifreq ifr; 158 int s; 159 160 if ((s = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { 161 syslog(LOG_ERR, "<%s> socket: %s", __FUNCTION__, 162 strerror(errno)); 163 return (oifflags & ~IFF_UP); 164 } 165 166 if_indextoname(ifindex, ifr.ifr_name); 167 if (ioctl(s, SIOCGIFFLAGS, (caddr_t)&ifr) < 0) { 168 syslog(LOG_ERR, "<%s> ioctl:SIOCGIFFLAGS: failed for %s", 169 __FUNCTION__, ifr.ifr_name); 170 close(s); 171 return (oifflags & ~IFF_UP); 172 } 173 return (ifr.ifr_flags); 174 } 175 176 #define ROUNDUP8(a) (1 + (((a) - 1) | 7)) 177 int 178 lladdropt_length(struct sockaddr_dl *sdl) 179 { 180 switch(sdl->sdl_type) { 181 case IFT_ETHER: 182 return(ROUNDUP8(ETHER_ADDR_LEN + 2)); 183 default: 184 return(0); 185 } 186 } 187 188 void 189 lladdropt_fill(struct sockaddr_dl *sdl, struct nd_opt_hdr *ndopt) 190 { 191 char *addr; 192 193 ndopt->nd_opt_type = ND_OPT_SOURCE_LINKADDR; /* fixed */ 194 195 switch(sdl->sdl_type) { 196 case IFT_ETHER: 197 ndopt->nd_opt_len = (ROUNDUP8(ETHER_ADDR_LEN + 2)) >> 3; 198 addr = (char *)(ndopt + 1); 199 memcpy(addr, LLADDR(sdl), ETHER_ADDR_LEN); 200 break; 201 default: 202 syslog(LOG_ERR, 203 "<%s> unsupported link type(%d)", 204 __FUNCTION__, sdl->sdl_type); 205 exit(1); 206 } 207 208 return; 209 } 210 211 int 212 rtbuf_len() 213 { 214 size_t len; 215 216 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0}; 217 218 if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0) 219 return(-1); 220 221 return(len); 222 } 223 224 int 225 get_rtinfo(char *buf, size_t *len) 226 { 227 int mib[6] = {CTL_NET, AF_ROUTE, 0, AF_INET6, NET_RT_DUMP, 0}; 228 229 if (sysctl(mib, 6, buf, len, NULL, 0) < 0) 230 return(-1); 231 232 return(0); 233 } 234 235 #define FILTER_MATCH(type, filter) ((0x1 << type) & filter) 236 #define SIN6(s) ((struct sockaddr_in6 *)(s)) 237 #define SDL(s) ((struct sockaddr_dl *)(s)) 238 char * 239 get_next_msg(char *buf, char *lim, int ifindex, size_t *lenp, int filter) 240 { 241 struct rt_msghdr *rtm; 242 struct ifa_msghdr *ifam; 243 struct sockaddr *sa, *dst, *gw, *ifa, *rti_info[RTAX_MAX]; 244 245 *lenp = 0; 246 for (rtm = (struct rt_msghdr *)buf; 247 rtm < (struct rt_msghdr *)lim; 248 rtm = (struct rt_msghdr *)(((char *)rtm) + rtm->rtm_msglen)) { 249 /* just for safety */ 250 if (!rtm->rtm_msglen) { 251 syslog(LOG_WARNING, "<%s> rtm_msglen is 0 " 252 "(buf=%p lim=%p rtm=%p)", __FUNCTION__, 253 buf, lim, rtm); 254 break; 255 } 256 if (FILTER_MATCH(rtm->rtm_type, filter) == 0) { 257 continue; 258 } 259 260 switch (rtm->rtm_type) { 261 case RTM_GET: 262 case RTM_ADD: 263 case RTM_DELETE: 264 /* address related checks */ 265 sa = (struct sockaddr *)(rtm + 1); 266 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 267 if ((dst = rti_info[RTAX_DST]) == NULL || 268 dst->sa_family != AF_INET6) 269 continue; 270 271 if (IN6_IS_ADDR_LINKLOCAL(&SIN6(dst)->sin6_addr) || 272 IN6_IS_ADDR_MULTICAST(&SIN6(dst)->sin6_addr)) 273 continue; 274 275 if ((gw = rti_info[RTAX_GATEWAY]) == NULL || 276 gw->sa_family != AF_LINK) 277 continue; 278 if (ifindex && SDL(gw)->sdl_index != ifindex) 279 continue; 280 281 if (rti_info[RTAX_NETMASK] == NULL) 282 continue; 283 284 /* found */ 285 *lenp = rtm->rtm_msglen; 286 return (char *)rtm; 287 /* NOTREACHED */ 288 case RTM_NEWADDR: 289 case RTM_DELADDR: 290 ifam = (struct ifa_msghdr *)rtm; 291 292 /* address related checks */ 293 sa = (struct sockaddr *)(ifam + 1); 294 get_rtaddrs(ifam->ifam_addrs, sa, rti_info); 295 if ((ifa = rti_info[RTAX_IFA]) == NULL || 296 (ifa->sa_family != AF_INET && 297 ifa->sa_family != AF_INET6)) 298 continue; 299 300 if (ifa->sa_family == AF_INET6 && 301 (IN6_IS_ADDR_LINKLOCAL(&SIN6(ifa)->sin6_addr) || 302 IN6_IS_ADDR_MULTICAST(&SIN6(ifa)->sin6_addr))) 303 continue; 304 305 if (ifindex && ifam->ifam_index != ifindex) 306 continue; 307 308 /* found */ 309 *lenp = ifam->ifam_msglen; 310 return (char *)rtm; 311 /* NOTREACHED */ 312 case RTM_IFINFO: 313 /* found */ 314 *lenp = rtm->rtm_msglen; 315 return (char *)rtm; 316 /* NOTREACHED */ 317 } 318 } 319 320 return (char *)rtm; 321 } 322 #undef FILTER_MATCH(type, filter) 323 324 struct in6_addr * 325 get_addr(char *buf) 326 { 327 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 328 struct sockaddr *sa, *rti_info[RTAX_MAX]; 329 330 sa = (struct sockaddr *)(rtm + 1); 331 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 332 333 return(&SIN6(rti_info[RTAX_DST])->sin6_addr); 334 } 335 336 int 337 get_rtm_ifindex(char *buf) 338 { 339 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 340 struct sockaddr *sa, *rti_info[RTAX_MAX]; 341 342 sa = (struct sockaddr *)(rtm + 1); 343 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 344 345 return(((struct sockaddr_dl *)rti_info[RTAX_GATEWAY])->sdl_index); 346 } 347 348 int 349 get_ifm_ifindex(char *buf) 350 { 351 struct if_msghdr *ifm = (struct if_msghdr *)buf; 352 353 return ((int)ifm->ifm_index); 354 } 355 356 int 357 get_ifam_ifindex(char *buf) 358 { 359 struct ifa_msghdr *ifam = (struct ifa_msghdr *)buf; 360 361 return ((int)ifam->ifam_index); 362 } 363 364 int 365 get_ifm_flags(char *buf) 366 { 367 struct if_msghdr *ifm = (struct if_msghdr *)buf; 368 369 return (ifm->ifm_flags); 370 } 371 372 int 373 get_prefixlen(char *buf) 374 { 375 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 376 struct sockaddr *sa, *rti_info[RTAX_MAX]; 377 int masklen; 378 u_char *p, *lim; 379 380 sa = (struct sockaddr *)(rtm + 1); 381 get_rtaddrs(rtm->rtm_addrs, sa, rti_info); 382 sa = rti_info[RTAX_NETMASK]; 383 384 p = (u_char *)(&SIN6(sa)->sin6_addr); 385 lim = (u_char *)sa + sa->sa_len; 386 for (masklen = 0; p < lim; p++) { 387 switch (*p) { 388 case 0xff: 389 masklen += 8; 390 break; 391 case 0xfe: 392 masklen += 7; 393 break; 394 case 0xfc: 395 masklen += 6; 396 break; 397 case 0xf8: 398 masklen += 5; 399 break; 400 case 0xf0: 401 masklen += 4; 402 break; 403 case 0xe0: 404 masklen += 3; 405 break; 406 case 0xc0: 407 masklen += 2; 408 break; 409 case 0x80: 410 masklen += 1; 411 break; 412 case 0x00: 413 break; 414 default: 415 return(-1); 416 } 417 } 418 419 return(masklen); 420 } 421 422 int 423 rtmsg_type(char *buf) 424 { 425 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 426 427 return(rtm->rtm_type); 428 } 429 430 int 431 rtmsg_len(char *buf) 432 { 433 struct rt_msghdr *rtm = (struct rt_msghdr *)buf; 434 435 return(rtm->rtm_msglen); 436 } 437 438 int 439 ifmsg_len(char *buf) 440 { 441 struct if_msghdr *ifm = (struct if_msghdr *)buf; 442 443 return(ifm->ifm_msglen); 444 } 445 446 /* 447 * alloc buffer and get if_msghdrs block from kernel, 448 * and put them into the buffer 449 */ 450 static void 451 get_iflist(char **buf, size_t *size) 452 { 453 int mib[6]; 454 455 mib[0] = CTL_NET; 456 mib[1] = PF_ROUTE; 457 mib[2] = 0; 458 mib[3] = AF_INET6; 459 mib[4] = NET_RT_IFLIST; 460 mib[5] = 0; 461 462 if (sysctl(mib, 6, NULL, size, NULL, 0) < 0) { 463 syslog(LOG_ERR, "<%s> sysctl: iflist size get failed", 464 __FUNCTION__); 465 exit(1); 466 } 467 if ((*buf = malloc(*size)) == NULL) { 468 syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__); 469 exit(1); 470 } 471 if (sysctl(mib, 6, *buf, size, NULL, 0) < 0) { 472 syslog(LOG_ERR, "<%s> sysctl: iflist get failed", 473 __FUNCTION__); 474 exit(1); 475 } 476 return; 477 } 478 479 /* 480 * alloc buffer and parse if_msghdrs block passed as arg, 481 * and init the buffer as list of pointers ot each of the if_msghdr. 482 */ 483 static void 484 parse_iflist(struct if_msghdr ***ifmlist_p, char *buf, size_t bufsize) 485 { 486 int iflentry_size, malloc_size; 487 struct if_msghdr *ifm; 488 struct ifa_msghdr *ifam; 489 char *lim; 490 491 /* 492 * Estimate least size of an iflist entry, to be obtained from kernel. 493 * Should add sizeof(sockaddr) ?? 494 */ 495 iflentry_size = sizeof(struct if_msghdr); 496 /* roughly estimate max list size of pointers to each if_msghdr */ 497 malloc_size = (bufsize/iflentry_size) * sizeof(size_t); 498 if ((*ifmlist_p = (struct if_msghdr **)malloc(malloc_size)) == NULL) { 499 syslog(LOG_ERR, "<%s> malloc failed", __FUNCTION__); 500 exit(1); 501 } 502 503 lim = buf + bufsize; 504 for (ifm = (struct if_msghdr *)buf; ifm < (struct if_msghdr *)lim;) { 505 if (ifm->ifm_msglen == 0) { 506 syslog(LOG_WARNING, "<%s> ifm_msglen is 0 " 507 "(buf=%p lim=%p ifm=%p)", __FUNCTION__, 508 buf, lim, ifm); 509 return; 510 } 511 512 if (ifm->ifm_type == RTM_IFINFO) { 513 (*ifmlist_p)[ifm->ifm_index] = ifm; 514 } else { 515 syslog(LOG_ERR, "out of sync parsing NET_RT_IFLIST\n" 516 "expected %d, got %d\n msglen = %d\n" 517 "buf:%p, ifm:%p, lim:%p\n", 518 RTM_IFINFO, ifm->ifm_type, ifm->ifm_msglen, 519 buf, ifm, lim); 520 exit (1); 521 } 522 for (ifam = (struct ifa_msghdr *) 523 ((char *)ifm + ifm->ifm_msglen); 524 ifam < (struct ifa_msghdr *)lim; 525 ifam = (struct ifa_msghdr *) 526 ((char *)ifam + ifam->ifam_msglen)) { 527 /* just for safety */ 528 if (!ifam->ifam_msglen) { 529 syslog(LOG_WARNING, "<%s> ifa_msglen is 0 " 530 "(buf=%p lim=%p ifam=%p)", __FUNCTION__, 531 buf, lim, ifam); 532 return; 533 } 534 if (ifam->ifam_type != RTM_NEWADDR) 535 break; 536 } 537 ifm = (struct if_msghdr *)ifam; 538 } 539 } 540 541 void 542 init_iflist() 543 { 544 if (ifblock) { 545 free(ifblock); 546 ifblock_size = 0; 547 } 548 if (iflist) 549 free(iflist); 550 /* get iflist block from kernel */ 551 get_iflist(&ifblock, &ifblock_size); 552 553 /* make list of pointers to each if_msghdr */ 554 parse_iflist(&iflist, ifblock, ifblock_size); 555 556 } 557