| 1 | /* $NetBSD: link_proto.c,v 1.32 2016/11/19 14:44:00 njoly 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 1.32 2016/11/19 14:44:00 njoly 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_READER_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_READER_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 0; |
| 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 | |