link_proto.c revision 1.28
1 /* $NetBSD: link_proto.c,v 1.28 2015/05/02 17:18:03 rtr Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 * 31 * @(#)uipc_proto.c 8.2 (Berkeley) 2/14/95 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: link_proto.c,v 1.28 2015/05/02 17:18:03 rtr Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/socket.h> 39 #include <sys/protosw.h> 40 #include <sys/domain.h> 41 #include <sys/mbuf.h> 42 #include <sys/un.h> 43 #include <sys/socketvar.h> 44 45 #include <net/if.h> 46 #include <net/if_dl.h> 47 #include <net/raw_cb.h> 48 #include <net/route.h> 49 50 static int sockaddr_dl_cmp(const struct sockaddr *, const struct sockaddr *); 51 static int link_attach(struct socket *, int); 52 static void link_detach(struct socket *); 53 static int link_accept(struct socket *, struct sockaddr *); 54 static int link_bind(struct socket *, struct sockaddr *, struct lwp *); 55 static int link_listen(struct socket *, struct lwp *); 56 static int link_connect(struct socket *, struct sockaddr *, struct lwp *); 57 static int link_connect2(struct socket *, struct socket *); 58 static int link_disconnect(struct socket *); 59 static int link_shutdown(struct socket *); 60 static int link_abort(struct socket *); 61 static int link_ioctl(struct socket *, u_long, void *, struct ifnet *); 62 static int link_stat(struct socket *, struct stat *); 63 static int link_peeraddr(struct socket *, struct sockaddr *); 64 static int link_sockaddr(struct socket *, struct sockaddr *); 65 static int link_rcvd(struct socket *, int, struct lwp *); 66 static int link_recvoob(struct socket *, struct mbuf *, int); 67 static int link_send(struct socket *, struct mbuf *, struct sockaddr *, 68 struct mbuf *, struct lwp *); 69 static int link_sendoob(struct socket *, struct mbuf *, struct mbuf *); 70 static int link_purgeif(struct socket *, struct ifnet *); 71 static void link_init(void); 72 73 /* 74 * Definitions of protocols supported in the link-layer domain. 75 */ 76 77 DOMAIN_DEFINE(linkdomain); /* forward define and add to link set */ 78 79 static const struct pr_usrreqs link_usrreqs = { 80 .pr_attach = link_attach, 81 .pr_detach = link_detach, 82 .pr_accept = link_accept, 83 .pr_bind = link_bind, 84 .pr_listen = link_listen, 85 .pr_connect = link_connect, 86 .pr_connect2 = link_connect2, 87 .pr_disconnect = link_disconnect, 88 .pr_shutdown = link_shutdown, 89 .pr_abort = link_abort, 90 .pr_ioctl = link_ioctl, 91 .pr_stat = link_stat, 92 .pr_peeraddr = link_peeraddr, 93 .pr_sockaddr = link_sockaddr, 94 .pr_rcvd = link_rcvd, 95 .pr_recvoob = link_recvoob, 96 .pr_send = link_send, 97 .pr_sendoob = link_sendoob, 98 .pr_purgeif = link_purgeif, 99 }; 100 101 const struct protosw linksw[] = { 102 { .pr_type = SOCK_DGRAM, 103 .pr_domain = &linkdomain, 104 .pr_protocol = 0, /* XXX */ 105 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF, 106 .pr_input = NULL, 107 .pr_ctlinput = NULL, 108 .pr_ctloutput = NULL, 109 .pr_usrreqs = &link_usrreqs, 110 .pr_init = link_init, 111 }, 112 }; 113 114 struct domain linkdomain = { 115 .dom_family = AF_LINK, 116 .dom_name = "link", 117 .dom_externalize = NULL, 118 .dom_dispose = NULL, 119 .dom_protosw = linksw, 120 .dom_protoswNPROTOSW = &linksw[__arraycount(linksw)], 121 .dom_sockaddr_cmp = sockaddr_dl_cmp 122 }; 123 124 static void 125 link_init(void) 126 { 127 return; 128 } 129 130 static int 131 link_control(struct socket *so, unsigned long cmd, void *data, 132 struct ifnet *ifp) 133 { 134 int error, s; 135 bool isactive, mkactive; 136 struct if_laddrreq *iflr; 137 union { 138 struct sockaddr sa; 139 struct sockaddr_dl sdl; 140 struct sockaddr_storage ss; 141 } u; 142 struct ifaddr *ifa; 143 const struct sockaddr_dl *asdl, *nsdl; 144 145 switch (cmd) { 146 case SIOCALIFADDR: 147 case SIOCDLIFADDR: 148 case SIOCGLIFADDR: 149 iflr = data; 150 151 if (iflr->addr.ss_family != AF_LINK) 152 return EINVAL; 153 154 asdl = satocsdl(sstocsa(&iflr->addr)); 155 156 if (asdl->sdl_alen != ifp->if_addrlen) 157 return EINVAL; 158 159 if (sockaddr_dl_init(&u.sdl, sizeof(u.ss), ifp->if_index, 160 ifp->if_type, ifp->if_xname, strlen(ifp->if_xname), 161 CLLADDR(asdl), asdl->sdl_alen) == NULL) 162 return EINVAL; 163 164 if ((iflr->flags & IFLR_PREFIX) == 0) 165 ; 166 else if (iflr->prefixlen != NBBY * ifp->if_addrlen) 167 return EINVAL; /* XXX match with prefix */ 168 169 error = 0; 170 171 s = splnet(); 172 173 IFADDR_FOREACH(ifa, ifp) { 174 if (sockaddr_cmp(&u.sa, ifa->ifa_addr) == 0) 175 break; 176 } 177 178 switch (cmd) { 179 case SIOCGLIFADDR: 180 if ((iflr->flags & IFLR_PREFIX) == 0) { 181 IFADDR_FOREACH(ifa, ifp) { 182 if (ifa->ifa_addr->sa_family == AF_LINK) 183 break; 184 } 185 } 186 if (ifa == NULL) { 187 error = EADDRNOTAVAIL; 188 break; 189 } 190 191 if (ifa == ifp->if_dl) 192 iflr->flags = IFLR_ACTIVE; 193 else 194 iflr->flags = 0; 195 196 if (ifa == ifp->if_hwdl) 197 iflr->flags |= IFLR_FACTORY; 198 199 sockaddr_copy(sstosa(&iflr->addr), sizeof(iflr->addr), 200 ifa->ifa_addr); 201 202 break; 203 case SIOCDLIFADDR: 204 if (ifa == NULL) 205 error = EADDRNOTAVAIL; 206 else if (ifa == ifp->if_dl || ifa == ifp->if_hwdl) 207 error = EBUSY; 208 else { 209 /* TBD routing socket */ 210 rt_newaddrmsg(RTM_DELETE, ifa, 0, NULL); 211 ifa_remove(ifp, ifa); 212 } 213 break; 214 case SIOCALIFADDR: 215 if (ifa != NULL) 216 ; 217 else if ((ifa = if_dl_create(ifp, &nsdl)) == NULL) { 218 error = ENOMEM; 219 break; 220 } else { 221 sockaddr_copy(ifa->ifa_addr, 222 ifa->ifa_addr->sa_len, &u.sa); 223 ifa_insert(ifp, ifa); 224 rt_newaddrmsg(RTM_ADD, ifa, 0, NULL); 225 } 226 227 mkactive = (iflr->flags & IFLR_ACTIVE) != 0; 228 isactive = (ifa == ifp->if_dl); 229 230 if (!isactive && mkactive) { 231 if_activate_sadl(ifp, ifa, nsdl); 232 rt_newaddrmsg(RTM_CHANGE, ifa, 0, NULL); 233 error = ENETRESET; 234 } 235 break; 236 } 237 splx(s); 238 if (error != ENETRESET) 239 return error; 240 else if ((ifp->if_flags & IFF_RUNNING) != 0 && 241 ifp->if_init != NULL) 242 return (*ifp->if_init)(ifp); 243 else 244 return 0; 245 default: 246 return ENOTTY; 247 } 248 } 249 250 static int 251 link_attach(struct socket *so, int proto) 252 { 253 sosetlock(so); 254 KASSERT(solocked(so)); 255 return 0; 256 } 257 258 static void 259 link_detach(struct socket *so) 260 { 261 KASSERT(solocked(so)); 262 sofree(so); 263 } 264 265 static int 266 link_accept(struct socket *so, struct sockaddr *nam) 267 { 268 KASSERT(solocked(so)); 269 270 return EOPNOTSUPP; 271 } 272 273 static int 274 link_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 275 { 276 KASSERT(solocked(so)); 277 278 return EOPNOTSUPP; 279 } 280 281 static int 282 link_listen(struct socket *so, struct lwp *l) 283 { 284 KASSERT(solocked(so)); 285 286 return EOPNOTSUPP; 287 } 288 289 static int 290 link_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 291 { 292 KASSERT(solocked(so)); 293 294 return EOPNOTSUPP; 295 } 296 297 static int 298 link_connect2(struct socket *so, struct socket *so2) 299 { 300 KASSERT(solocked(so)); 301 302 return EOPNOTSUPP; 303 } 304 305 static int 306 link_disconnect(struct socket *so) 307 { 308 KASSERT(solocked(so)); 309 310 return EOPNOTSUPP; 311 } 312 313 static int 314 link_shutdown(struct socket *so) 315 { 316 KASSERT(solocked(so)); 317 318 return EOPNOTSUPP; 319 } 320 321 static int 322 link_abort(struct socket *so) 323 { 324 KASSERT(solocked(so)); 325 326 return EOPNOTSUPP; 327 } 328 329 static int 330 link_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp) 331 { 332 return link_control(so, cmd, nam, ifp); 333 } 334 335 static int 336 link_stat(struct socket *so, struct stat *ub) 337 { 338 KASSERT(solocked(so)); 339 340 return EOPNOTSUPP; 341 } 342 343 static int 344 link_peeraddr(struct socket *so, struct sockaddr *nam) 345 { 346 KASSERT(solocked(so)); 347 348 return EOPNOTSUPP; 349 } 350 351 static int 352 link_sockaddr(struct socket *so, struct sockaddr *nam) 353 { 354 KASSERT(solocked(so)); 355 356 return EOPNOTSUPP; 357 } 358 359 static int 360 link_rcvd(struct socket *so, int flags, struct lwp *l) 361 { 362 KASSERT(solocked(so)); 363 364 return EOPNOTSUPP; 365 } 366 367 static int 368 link_recvoob(struct socket *so, struct mbuf *m, int flags) 369 { 370 KASSERT(solocked(so)); 371 372 return EOPNOTSUPP; 373 } 374 375 static int 376 link_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 377 struct mbuf *control, struct lwp *l) 378 { 379 KASSERT(solocked(so)); 380 381 return EOPNOTSUPP; 382 } 383 384 static int 385 link_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 386 { 387 KASSERT(solocked(so)); 388 389 return EOPNOTSUPP; 390 } 391 392 static int 393 link_purgeif(struct socket *so, struct ifnet *ifp) 394 { 395 396 return EOPNOTSUPP; 397 } 398 399 /* Compare the field at byte offsets [fieldstart, fieldend) in 400 * two memory regions, [l, l + llen) and [r, r + llen). 401 */ 402 static inline int 403 submemcmp(const void *l, const void *r, 404 const uint_fast8_t llen, const uint_fast8_t rlen, 405 const uint_fast8_t fieldstart, const uint_fast8_t fieldend) 406 { 407 uint_fast8_t cmpend, minlen; 408 const uint8_t *lb = l, *rb = r; 409 int rc; 410 411 minlen = MIN(llen, rlen); 412 413 /* The field is missing from one region. The shorter region is the 414 * lesser region. 415 */ 416 if (fieldstart >= minlen) 417 return llen - rlen; 418 419 /* Two empty, present fields are always equal. */ 420 if (fieldstart > fieldend) 421 return 0; 422 423 cmpend = MIN(fieldend, minlen); 424 425 rc = memcmp(&lb[fieldstart], &rb[fieldstart], cmpend - fieldstart); 426 427 if (rc != 0) 428 return rc; 429 /* If one or both fields are truncated, then the shorter is the lesser 430 * field. 431 */ 432 if (minlen < fieldend) 433 return llen - rlen; 434 /* Fields are full-length and equal. The fields are equal. */ 435 return 0; 436 } 437 438 uint8_t 439 sockaddr_dl_measure(uint8_t namelen, uint8_t addrlen) 440 { 441 return offsetof(struct sockaddr_dl, sdl_data[namelen + addrlen]); 442 } 443 444 struct sockaddr * 445 sockaddr_dl_alloc(uint16_t ifindex, uint8_t type, 446 const void *name, uint8_t namelen, const void *addr, uint8_t addrlen, 447 int flags) 448 { 449 struct sockaddr *sa; 450 socklen_t len; 451 452 len = sockaddr_dl_measure(namelen, addrlen); 453 sa = sockaddr_alloc(AF_LINK, len, flags); 454 455 if (sa == NULL) 456 return NULL; 457 458 if (sockaddr_dl_init(satosdl(sa), len, ifindex, type, name, namelen, 459 addr, addrlen) == NULL) { 460 sockaddr_free(sa); 461 return NULL; 462 } 463 464 return sa; 465 } 466 467 struct sockaddr_dl * 468 sockaddr_dl_init(struct sockaddr_dl *sdl, socklen_t socklen, uint16_t ifindex, 469 uint8_t type, const void *name, uint8_t namelen, const void *addr, 470 uint8_t addrlen) 471 { 472 socklen_t len; 473 474 sdl->sdl_family = AF_LINK; 475 sdl->sdl_slen = 0; 476 len = sockaddr_dl_measure(namelen, addrlen); 477 if (len > socklen) { 478 sdl->sdl_len = socklen; 479 #ifdef DIAGNOSTIC 480 printf("%s: too long: %u > %u\n", __func__, (u_int)len, 481 (u_int)socklen); 482 #endif 483 return NULL; 484 } 485 sdl->sdl_len = len; 486 sdl->sdl_index = ifindex; 487 sdl->sdl_type = type; 488 memset(&sdl->sdl_data[0], 0, namelen + addrlen); 489 if (name != NULL) { 490 memcpy(&sdl->sdl_data[0], name, namelen); 491 sdl->sdl_nlen = namelen; 492 } else 493 sdl->sdl_nlen = 0; 494 if (addr != NULL) { 495 memcpy(&sdl->sdl_data[sdl->sdl_nlen], addr, addrlen); 496 sdl->sdl_alen = addrlen; 497 } else 498 sdl->sdl_alen = 0; 499 return sdl; 500 } 501 502 static int 503 sockaddr_dl_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 504 { 505 int rc; 506 const uint_fast8_t indexofs = offsetof(struct sockaddr_dl, sdl_index); 507 const uint_fast8_t nlenofs = offsetof(struct sockaddr_dl, sdl_nlen); 508 uint_fast8_t dataofs = offsetof(struct sockaddr_dl, sdl_data[0]); 509 const struct sockaddr_dl *sdl1, *sdl2; 510 511 sdl1 = satocsdl(sa1); 512 sdl2 = satocsdl(sa2); 513 514 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 515 indexofs, nlenofs); 516 517 if (rc != 0) 518 return rc; 519 520 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 521 dataofs, dataofs + MIN(sdl1->sdl_nlen, sdl2->sdl_nlen)); 522 523 if (rc != 0) 524 return rc; 525 526 if (sdl1->sdl_nlen != sdl2->sdl_nlen) 527 return sdl1->sdl_nlen - sdl2->sdl_nlen; 528 529 dataofs += sdl1->sdl_nlen; 530 531 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 532 dataofs, dataofs + MIN(sdl1->sdl_alen, sdl2->sdl_alen)); 533 534 if (rc != 0) 535 return rc; 536 537 if (sdl1->sdl_alen != sdl2->sdl_alen) 538 return sdl1->sdl_alen - sdl2->sdl_alen; 539 540 dataofs += sdl1->sdl_alen; 541 542 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 543 dataofs, dataofs + MIN(sdl1->sdl_slen, sdl2->sdl_slen)); 544 545 if (sdl1->sdl_slen != sdl2->sdl_slen) 546 return sdl1->sdl_slen - sdl2->sdl_slen; 547 548 return sdl1->sdl_len - sdl2->sdl_len; 549 } 550 551 struct sockaddr_dl * 552 sockaddr_dl_setaddr(struct sockaddr_dl *sdl, socklen_t socklen, 553 const void *addr, uint8_t addrlen) 554 { 555 socklen_t len; 556 557 len = sockaddr_dl_measure(sdl->sdl_nlen, addrlen); 558 if (len > socklen) { 559 #ifdef DIAGNOSTIC 560 printf("%s: too long: %u > %u\n", __func__, (u_int)len, 561 (u_int)socklen); 562 #endif 563 return NULL; 564 } 565 memcpy(&sdl->sdl_data[sdl->sdl_nlen], addr, addrlen); 566 sdl->sdl_alen = addrlen; 567 sdl->sdl_len = len; 568 return sdl; 569 } 570
Indexes created Wed Sep 24 22:09:59 GMT 2025