link_proto.c revision 1.38
1 /* $NetBSD: link_proto.c,v 1.38 2019/04/29 11:57:22 roy 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 1.38 2019/04/29 11:57:22 roy 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 struct psref psref; 145 146 switch (cmd) { 147 case SIOCALIFADDR: 148 case SIOCDLIFADDR: 149 case SIOCGLIFADDR: 150 iflr = data; 151 152 if (iflr->addr.ss_family != AF_LINK) 153 return EINVAL; 154 155 asdl = satocsdl(sstocsa(&iflr->addr)); 156 157 if (asdl->sdl_alen != ifp->if_addrlen) 158 return EINVAL; 159 160 if (sockaddr_dl_init(&u.sdl, sizeof(u.ss), ifp->if_index, 161 ifp->if_type, ifp->if_xname, strlen(ifp->if_xname), 162 CLLADDR(asdl), asdl->sdl_alen) == NULL) 163 return EINVAL; 164 165 if ((iflr->flags & IFLR_PREFIX) == 0) 166 ; 167 else if (iflr->prefixlen != NBBY * ifp->if_addrlen) 168 return EINVAL; /* XXX match with prefix */ 169 170 error = 0; 171 172 s = pserialize_read_enter(); 173 IFADDR_READER_FOREACH(ifa, ifp) { 174 if (sockaddr_cmp(&u.sa, ifa->ifa_addr) == 0) { 175 ifa_acquire(ifa, &psref); 176 break; 177 } 178 } 179 pserialize_read_exit(s); 180 181 switch (cmd) { 182 case SIOCGLIFADDR: 183 ifa_release(ifa, &psref); 184 s = pserialize_read_enter(); 185 if ((iflr->flags & IFLR_PREFIX) == 0) { 186 IFADDR_READER_FOREACH(ifa, ifp) { 187 if (ifa->ifa_addr->sa_family == AF_LINK) 188 break; 189 } 190 } 191 if (ifa == NULL) { 192 pserialize_read_exit(s); 193 error = EADDRNOTAVAIL; 194 break; 195 } 196 197 if (ifa == ifp->if_dl) 198 iflr->flags = IFLR_ACTIVE; 199 else 200 iflr->flags = 0; 201 202 if (ifa == ifp->if_hwdl) 203 iflr->flags |= IFLR_FACTORY; 204 205 sockaddr_copy(sstosa(&iflr->addr), sizeof(iflr->addr), 206 ifa->ifa_addr); 207 pserialize_read_exit(s); 208 ifa = NULL; 209 210 break; 211 case SIOCDLIFADDR: 212 if (ifa == NULL) 213 error = EADDRNOTAVAIL; 214 else if (ifa == ifp->if_dl || ifa == ifp->if_hwdl) 215 error = EBUSY; 216 else { 217 /* TBD routing socket */ 218 rt_addrmsg(RTM_DELETE, ifa); 219 /* We need to release psref for ifa_remove */ 220 ifaref(ifa); 221 ifa_release(ifa, &psref); 222 ifa_remove(ifp, ifa); 223 KASSERT(ifa->ifa_refcnt == 1); 224 ifafree(ifa); 225 ifa = NULL; 226 } 227 break; 228 case SIOCALIFADDR: 229 if (ifa == NULL) { 230 ifa = if_dl_create(ifp, &nsdl); 231 if (ifa == NULL) { 232 error = ENOMEM; 233 break; 234 } 235 ifa_acquire(ifa, &psref); 236 sockaddr_copy(ifa->ifa_addr, 237 ifa->ifa_addr->sa_len, &u.sa); 238 ifa_insert(ifp, ifa); 239 rt_addrmsg(RTM_ADD, ifa); 240 } 241 242 mkactive = (iflr->flags & IFLR_ACTIVE) != 0; 243 isactive = (ifa == ifp->if_dl); 244 245 if (!isactive && mkactive) { 246 if_activate_sadl(ifp, ifa, nsdl); 247 rt_addrmsg(RTM_CHANGE, ifa); 248 error = ENETRESET; 249 } 250 break; 251 } 252 ifa_release(ifa, &psref); 253 if (error != ENETRESET) 254 return error; 255 else if ((ifp->if_flags & IFF_RUNNING) != 0 && 256 ifp->if_init != NULL) 257 return (*ifp->if_init)(ifp); 258 else 259 return 0; 260 default: 261 return ENOTTY; 262 } 263 } 264 265 static int 266 link_attach(struct socket *so, int proto) 267 { 268 sosetlock(so); 269 KASSERT(solocked(so)); 270 return 0; 271 } 272 273 static void 274 link_detach(struct socket *so) 275 { 276 KASSERT(solocked(so)); 277 sofree(so); 278 } 279 280 static int 281 link_accept(struct socket *so, struct sockaddr *nam) 282 { 283 KASSERT(solocked(so)); 284 285 return EOPNOTSUPP; 286 } 287 288 static int 289 link_bind(struct socket *so, struct sockaddr *nam, struct lwp *l) 290 { 291 KASSERT(solocked(so)); 292 293 return EOPNOTSUPP; 294 } 295 296 static int 297 link_listen(struct socket *so, struct lwp *l) 298 { 299 KASSERT(solocked(so)); 300 301 return EOPNOTSUPP; 302 } 303 304 static int 305 link_connect(struct socket *so, struct sockaddr *nam, struct lwp *l) 306 { 307 KASSERT(solocked(so)); 308 309 return EOPNOTSUPP; 310 } 311 312 static int 313 link_connect2(struct socket *so, struct socket *so2) 314 { 315 KASSERT(solocked(so)); 316 317 return EOPNOTSUPP; 318 } 319 320 static int 321 link_disconnect(struct socket *so) 322 { 323 KASSERT(solocked(so)); 324 325 return EOPNOTSUPP; 326 } 327 328 static int 329 link_shutdown(struct socket *so) 330 { 331 KASSERT(solocked(so)); 332 333 return EOPNOTSUPP; 334 } 335 336 static int 337 link_abort(struct socket *so) 338 { 339 KASSERT(solocked(so)); 340 341 return EOPNOTSUPP; 342 } 343 344 static int 345 link_ioctl(struct socket *so, u_long cmd, void *nam, struct ifnet *ifp) 346 { 347 return link_control(so, cmd, nam, ifp); 348 } 349 350 static int 351 link_stat(struct socket *so, struct stat *ub) 352 { 353 KASSERT(solocked(so)); 354 355 return 0; 356 } 357 358 static int 359 link_peeraddr(struct socket *so, struct sockaddr *nam) 360 { 361 KASSERT(solocked(so)); 362 363 return EOPNOTSUPP; 364 } 365 366 static int 367 link_sockaddr(struct socket *so, struct sockaddr *nam) 368 { 369 KASSERT(solocked(so)); 370 371 return EOPNOTSUPP; 372 } 373 374 static int 375 link_rcvd(struct socket *so, int flags, struct lwp *l) 376 { 377 KASSERT(solocked(so)); 378 379 return EOPNOTSUPP; 380 } 381 382 static int 383 link_recvoob(struct socket *so, struct mbuf *m, int flags) 384 { 385 KASSERT(solocked(so)); 386 387 return EOPNOTSUPP; 388 } 389 390 static int 391 link_send(struct socket *so, struct mbuf *m, struct sockaddr *nam, 392 struct mbuf *control, struct lwp *l) 393 { 394 KASSERT(solocked(so)); 395 396 return EOPNOTSUPP; 397 } 398 399 static int 400 link_sendoob(struct socket *so, struct mbuf *m, struct mbuf *control) 401 { 402 KASSERT(solocked(so)); 403 404 m_freem(m); 405 m_freem(control); 406 407 return EOPNOTSUPP; 408 } 409 410 static int 411 link_purgeif(struct socket *so, struct ifnet *ifp) 412 { 413 414 return EOPNOTSUPP; 415 } 416 417 /* Compare the field at byte offsets [fieldstart, fieldend) in 418 * two memory regions, [l, l + llen) and [r, r + llen). 419 */ 420 static inline int 421 submemcmp(const void *l, const void *r, 422 const uint_fast8_t llen, const uint_fast8_t rlen, 423 const uint_fast8_t fieldstart, const uint_fast8_t fieldend) 424 { 425 uint_fast8_t cmpend, minlen; 426 const uint8_t *lb = l, *rb = r; 427 int rc; 428 429 minlen = MIN(llen, rlen); 430 431 /* The field is missing from one region. The shorter region is the 432 * lesser region. 433 */ 434 if (fieldstart >= minlen) 435 return llen - rlen; 436 437 /* Two empty, present fields are always equal. */ 438 if (fieldstart > fieldend) 439 return 0; 440 441 cmpend = MIN(fieldend, minlen); 442 443 rc = memcmp(&lb[fieldstart], &rb[fieldstart], cmpend - fieldstart); 444 445 if (rc != 0) 446 return rc; 447 /* If one or both fields are truncated, then the shorter is the lesser 448 * field. 449 */ 450 if (minlen < fieldend) 451 return llen - rlen; 452 /* Fields are full-length and equal. The fields are equal. */ 453 return 0; 454 } 455 456 uint8_t 457 sockaddr_dl_measure(uint8_t namelen, uint8_t addrlen) 458 { 459 return offsetof(struct sockaddr_dl, sdl_data[namelen + addrlen]); 460 } 461 462 struct sockaddr * 463 sockaddr_dl_alloc(uint16_t ifindex, uint8_t type, 464 const void *name, uint8_t namelen, const void *addr, uint8_t addrlen, 465 int flags) 466 { 467 struct sockaddr *sa; 468 socklen_t len; 469 470 len = sockaddr_dl_measure(namelen, addrlen); 471 sa = sockaddr_alloc(AF_LINK, len, flags); 472 473 if (sa == NULL) 474 return NULL; 475 476 if (sockaddr_dl_init(satosdl(sa), len, ifindex, type, name, namelen, 477 addr, addrlen) == NULL) { 478 sockaddr_free(sa); 479 return NULL; 480 } 481 482 return sa; 483 } 484 485 struct sockaddr_dl * 486 sockaddr_dl_init(struct sockaddr_dl *sdl, socklen_t socklen, uint16_t ifindex, 487 uint8_t type, const void *name, uint8_t namelen, const void *addr, 488 uint8_t addrlen) 489 { 490 socklen_t len; 491 492 sdl->sdl_family = AF_LINK; 493 sdl->sdl_slen = 0; 494 len = sockaddr_dl_measure(namelen, addrlen); 495 if (len > socklen) { 496 sdl->sdl_len = socklen; 497 #ifdef DIAGNOSTIC 498 printf("%s: too long: %u > %u\n", __func__, (u_int)len, 499 (u_int)socklen); 500 #endif 501 return NULL; 502 } 503 sdl->sdl_len = len; 504 sdl->sdl_index = ifindex; 505 sdl->sdl_type = type; 506 memset(&sdl->sdl_data[0], 0, namelen + addrlen); 507 if (name != NULL) { 508 memcpy(&sdl->sdl_data[0], name, namelen); 509 sdl->sdl_nlen = namelen; 510 } else 511 sdl->sdl_nlen = 0; 512 if (addr != NULL) { 513 memcpy(&sdl->sdl_data[sdl->sdl_nlen], addr, addrlen); 514 sdl->sdl_alen = addrlen; 515 } else 516 sdl->sdl_alen = 0; 517 return sdl; 518 } 519 520 static int 521 sockaddr_dl_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 522 { 523 int rc; 524 const uint_fast8_t indexofs = offsetof(struct sockaddr_dl, sdl_index); 525 const uint_fast8_t nlenofs = offsetof(struct sockaddr_dl, sdl_nlen); 526 uint_fast8_t dataofs = offsetof(struct sockaddr_dl, sdl_data[0]); 527 const struct sockaddr_dl *sdl1, *sdl2; 528 529 sdl1 = satocsdl(sa1); 530 sdl2 = satocsdl(sa2); 531 532 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 533 indexofs, nlenofs); 534 535 if (rc != 0) 536 return rc; 537 538 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 539 dataofs, dataofs + MIN(sdl1->sdl_nlen, sdl2->sdl_nlen)); 540 541 if (rc != 0) 542 return rc; 543 544 if (sdl1->sdl_nlen != sdl2->sdl_nlen) 545 return sdl1->sdl_nlen - sdl2->sdl_nlen; 546 547 dataofs += sdl1->sdl_nlen; 548 549 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 550 dataofs, dataofs + MIN(sdl1->sdl_alen, sdl2->sdl_alen)); 551 552 if (rc != 0) 553 return rc; 554 555 if (sdl1->sdl_alen != sdl2->sdl_alen) 556 return sdl1->sdl_alen - sdl2->sdl_alen; 557 558 dataofs += sdl1->sdl_alen; 559 560 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 561 dataofs, dataofs + MIN(sdl1->sdl_slen, sdl2->sdl_slen)); 562 563 if (sdl1->sdl_slen != sdl2->sdl_slen) 564 return sdl1->sdl_slen - sdl2->sdl_slen; 565 566 return sdl1->sdl_len - sdl2->sdl_len; 567 } 568 569 struct sockaddr_dl * 570 sockaddr_dl_setaddr(struct sockaddr_dl *sdl, socklen_t socklen, 571 const void *addr, uint8_t addrlen) 572 { 573 socklen_t len; 574 575 len = sockaddr_dl_measure(sdl->sdl_nlen, addrlen); 576 if (len > socklen) { 577 #ifdef DIAGNOSTIC 578 printf("%s: too long: %u > %u\n", __func__, (u_int)len, 579 (u_int)socklen); 580 #endif 581 return NULL; 582 } 583 memcpy(&sdl->sdl_data[sdl->sdl_nlen], addr, addrlen); 584 sdl->sdl_alen = addrlen; 585 sdl->sdl_len = len; 586 return sdl; 587 } 588
Indexes created Wed Sep 24 15:09:51 GMT 2025