if_media.c revision 283758
1/* $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $ */ 2/* $FreeBSD: stable/10/sys/net/if_media.c 283758 2015-05-29 23:02:12Z erj $ */ 3 4/*- 5 * Copyright (c) 1997 6 * Jonathan Stone and Jason R. Thorpe. All rights reserved. 7 * 8 * This software is derived from information provided by Matt Thomas. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by Jonathan Stone 21 * and Jason R. Thorpe for the NetBSD Project. 22 * 4. The names of the authors may not be used to endorse or promote products 23 * derived from this software without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR 26 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 28 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 29 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 30 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 32 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 33 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 */ 37 38/* 39 * BSD/OS-compatible network interface media selection. 40 * 41 * Where it is safe to do so, this code strays slightly from the BSD/OS 42 * design. Software which uses the API (device drivers, basically) 43 * shouldn't notice any difference. 44 * 45 * Many thanks to Matt Thomas for providing the information necessary 46 * to implement this interface. 47 */ 48 49#include <sys/param.h> 50#include <sys/systm.h> 51#include <sys/socket.h> 52#include <sys/sockio.h> 53#include <sys/malloc.h> 54#include <sys/module.h> 55#include <sys/sysctl.h> 56 57#include <net/if.h> 58#include <net/if_media.h> 59 60/* 61 * Compile-time options: 62 * IFMEDIA_DEBUG: 63 * turn on implementation-level debug printfs. 64 * Useful for debugging newly-ported drivers. 65 */ 66 67static struct ifmedia_entry *ifmedia_match(struct ifmedia *ifm, 68 int flags, int mask); 69 70#ifdef IFMEDIA_DEBUG 71#include <net/if_var.h> 72int ifmedia_debug = 0; 73SYSCTL_INT(_debug, OID_AUTO, ifmedia, CTLFLAG_RW, &ifmedia_debug, 74 0, "if_media debugging msgs"); 75static void ifmedia_printword(int); 76#endif 77 78/* 79 * Initialize if_media struct for a specific interface instance. 80 */ 81void 82ifmedia_init(ifm, dontcare_mask, change_callback, status_callback) 83 struct ifmedia *ifm; 84 int dontcare_mask; 85 ifm_change_cb_t change_callback; 86 ifm_stat_cb_t status_callback; 87{ 88 89 LIST_INIT(&ifm->ifm_list); 90 ifm->ifm_cur = NULL; 91 ifm->ifm_media = 0; 92 ifm->ifm_mask = dontcare_mask; /* IF don't-care bits */ 93 ifm->ifm_change = change_callback; 94 ifm->ifm_status = status_callback; 95} 96 97void 98ifmedia_removeall(ifm) 99 struct ifmedia *ifm; 100{ 101 struct ifmedia_entry *entry; 102 103 for (entry = LIST_FIRST(&ifm->ifm_list); entry; 104 entry = LIST_FIRST(&ifm->ifm_list)) { 105 LIST_REMOVE(entry, ifm_list); 106 free(entry, M_IFADDR); 107 } 108} 109 110/* 111 * Add a media configuration to the list of supported media 112 * for a specific interface instance. 113 */ 114void 115ifmedia_add(ifm, mword, data, aux) 116 struct ifmedia *ifm; 117 int mword; 118 int data; 119 void *aux; 120{ 121 register struct ifmedia_entry *entry; 122 123#ifdef IFMEDIA_DEBUG 124 if (ifmedia_debug) { 125 if (ifm == NULL) { 126 printf("ifmedia_add: null ifm\n"); 127 return; 128 } 129 printf("Adding entry for "); 130 ifmedia_printword(mword); 131 } 132#endif 133 134 entry = malloc(sizeof(*entry), M_IFADDR, M_NOWAIT); 135 if (entry == NULL) 136 panic("ifmedia_add: can't malloc entry"); 137 138 entry->ifm_media = mword; 139 entry->ifm_data = data; 140 entry->ifm_aux = aux; 141 142 LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list); 143} 144 145/* 146 * Add an array of media configurations to the list of 147 * supported media for a specific interface instance. 148 */ 149void 150ifmedia_list_add(ifm, lp, count) 151 struct ifmedia *ifm; 152 struct ifmedia_entry *lp; 153 int count; 154{ 155 int i; 156 157 for (i = 0; i < count; i++) 158 ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data, 159 lp[i].ifm_aux); 160} 161 162/* 163 * Set the default active media. 164 * 165 * Called by device-specific code which is assumed to have already 166 * selected the default media in hardware. We do _not_ call the 167 * media-change callback. 168 */ 169void 170ifmedia_set(ifm, target) 171 struct ifmedia *ifm; 172 int target; 173 174{ 175 struct ifmedia_entry *match; 176 177 match = ifmedia_match(ifm, target, ifm->ifm_mask); 178 179 if (match == NULL) { 180 printf("ifmedia_set: no match for 0x%x/0x%x\n", 181 target, ~ifm->ifm_mask); 182 panic("ifmedia_set"); 183 } 184 ifm->ifm_cur = match; 185 186#ifdef IFMEDIA_DEBUG 187 if (ifmedia_debug) { 188 printf("ifmedia_set: target "); 189 ifmedia_printword(target); 190 printf("ifmedia_set: setting to "); 191 ifmedia_printword(ifm->ifm_cur->ifm_media); 192 } 193#endif 194} 195 196/* 197 * Given a media word, return one suitable for an application 198 * using the original encoding. 199 */ 200static int 201compat_media(int media) 202{ 203 204 if (IFM_TYPE(media) == IFM_ETHER && IFM_SUBTYPE(media) > IFM_OTHER) { 205 media &= ~(IFM_ETH_XTYPE|IFM_TMASK); 206 media |= IFM_OTHER; 207 } 208 return (media); 209} 210 211/* 212 * Device-independent media ioctl support function. 213 */ 214int 215ifmedia_ioctl(ifp, ifr, ifm, cmd) 216 struct ifnet *ifp; 217 struct ifreq *ifr; 218 struct ifmedia *ifm; 219 u_long cmd; 220{ 221 struct ifmedia_entry *match; 222 struct ifmediareq *ifmr = (struct ifmediareq *) ifr; 223 int error = 0, sticky; 224 225 if (ifp == NULL || ifr == NULL || ifm == NULL) 226 return(EINVAL); 227 228 switch (cmd) { 229 230 /* 231 * Set the current media. 232 */ 233 case SIOCSIFMEDIA: 234 { 235 struct ifmedia_entry *oldentry; 236 int oldmedia; 237 int newmedia = ifr->ifr_media; 238 239 match = ifmedia_match(ifm, newmedia, ifm->ifm_mask); 240 if (match == NULL) { 241#ifdef IFMEDIA_DEBUG 242 if (ifmedia_debug) { 243 printf( 244 "ifmedia_ioctl: no media found for 0x%x\n", 245 newmedia); 246 } 247#endif 248 return (ENXIO); 249 } 250 251 /* 252 * If no change, we're done. 253 * XXX Automedia may invole software intervention. 254 * Keep going in case the connected media changed. 255 * Similarly, if best match changed (kernel debugger?). 256 */ 257 if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) && 258 (newmedia == ifm->ifm_media) && 259 (match == ifm->ifm_cur)) 260 return 0; 261 262 /* 263 * We found a match, now make the driver switch to it. 264 * Make sure to preserve our old media type in case the 265 * driver can't switch. 266 */ 267#ifdef IFMEDIA_DEBUG 268 if (ifmedia_debug) { 269 printf("ifmedia_ioctl: switching %s to ", 270 ifp->if_xname); 271 ifmedia_printword(match->ifm_media); 272 } 273#endif 274 oldentry = ifm->ifm_cur; 275 oldmedia = ifm->ifm_media; 276 ifm->ifm_cur = match; 277 ifm->ifm_media = newmedia; 278 error = (*ifm->ifm_change)(ifp); 279 if (error) { 280 ifm->ifm_cur = oldentry; 281 ifm->ifm_media = oldmedia; 282 } 283 break; 284 } 285 286 /* 287 * Get list of available media and current media on interface. 288 */ 289 case SIOCGIFMEDIA: 290 case SIOCGIFXMEDIA: 291 { 292 struct ifmedia_entry *ep; 293 int *kptr, count; 294 int usermax; /* user requested max */ 295 296 kptr = NULL; /* XXX gcc */ 297 298 if (cmd == SIOCGIFMEDIA) { 299 ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ? 300 compat_media(ifm->ifm_cur->ifm_media) : IFM_NONE; 301 } else { 302 ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ? 303 ifm->ifm_cur->ifm_media : IFM_NONE; 304 } 305 ifmr->ifm_mask = ifm->ifm_mask; 306 ifmr->ifm_status = 0; 307 (*ifm->ifm_status)(ifp, ifmr); 308 309 count = 0; 310 usermax = 0; 311 312 /* 313 * If there are more interfaces on the list, count 314 * them. This allows the caller to set ifmr->ifm_count 315 * to 0 on the first call to know how much space to 316 * allocate. 317 */ 318 LIST_FOREACH(ep, &ifm->ifm_list, ifm_list) 319 usermax++; 320 321 /* 322 * Don't allow the user to ask for too many 323 * or a negative number. 324 */ 325 if (ifmr->ifm_count > usermax) 326 ifmr->ifm_count = usermax; 327 else if (ifmr->ifm_count < 0) 328 return (EINVAL); 329 330 if (ifmr->ifm_count != 0) { 331 kptr = (int *)malloc(ifmr->ifm_count * sizeof(int), 332 M_TEMP, M_NOWAIT); 333 334 if (kptr == NULL) 335 return (ENOMEM); 336 /* 337 * Get the media words from the interface's list. 338 */ 339 ep = LIST_FIRST(&ifm->ifm_list); 340 for (; ep != NULL && count < ifmr->ifm_count; 341 ep = LIST_NEXT(ep, ifm_list), count++) 342 kptr[count] = ep->ifm_media; 343 344 if (ep != NULL) 345 error = E2BIG; /* oops! */ 346 } else { 347 count = usermax; 348 } 349 350 /* 351 * We do the copyout on E2BIG, because that's 352 * just our way of telling userland that there 353 * are more. This is the behavior I've observed 354 * under BSD/OS 3.0 355 */ 356 sticky = error; 357 if ((error == 0 || error == E2BIG) && ifmr->ifm_count != 0) { 358 error = copyout((caddr_t)kptr, 359 (caddr_t)ifmr->ifm_ulist, 360 ifmr->ifm_count * sizeof(int)); 361 } 362 363 if (error == 0) 364 error = sticky; 365 366 if (ifmr->ifm_count != 0) 367 free(kptr, M_TEMP); 368 369 ifmr->ifm_count = count; 370 break; 371 } 372 373 default: 374 return (EINVAL); 375 } 376 377 return (error); 378} 379 380/* 381 * Find media entry matching a given ifm word. 382 * 383 */ 384static struct ifmedia_entry * 385ifmedia_match(ifm, target, mask) 386 struct ifmedia *ifm; 387 int target; 388 int mask; 389{ 390 struct ifmedia_entry *match, *next; 391 392 match = NULL; 393 mask = ~mask; 394 395 LIST_FOREACH(next, &ifm->ifm_list, ifm_list) { 396 if ((next->ifm_media & mask) == (target & mask)) { 397#if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC) 398 if (match) { 399 printf("ifmedia_match: multiple match for " 400 "0x%x/0x%x\n", target, mask); 401 } 402#endif 403 match = next; 404 } 405 } 406 407 return match; 408} 409 410/* 411 * Compute the interface `baudrate' from the media, for the interface 412 * metrics (used by routing daemons). 413 */ 414static const struct ifmedia_baudrate ifmedia_baudrate_descriptions[] = 415 IFM_BAUDRATE_DESCRIPTIONS; 416 417uint64_t 418ifmedia_baudrate(int mword) 419{ 420 int i; 421 422 for (i = 0; ifmedia_baudrate_descriptions[i].ifmb_word != 0; i++) { 423 if (IFM_TYPE_MATCH(mword, ifmedia_baudrate_descriptions[i].ifmb_word)) 424 return (ifmedia_baudrate_descriptions[i].ifmb_baudrate); 425 } 426 427 /* Not known. */ 428 return (0); 429} 430 431#ifdef IFMEDIA_DEBUG 432struct ifmedia_description ifm_type_descriptions[] = 433 IFM_TYPE_DESCRIPTIONS; 434 435struct ifmedia_description ifm_subtype_ethernet_descriptions[] = 436 IFM_SUBTYPE_ETHERNET_DESCRIPTIONS; 437 438struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] = 439 IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS; 440 441struct ifmedia_description ifm_subtype_tokenring_descriptions[] = 442 IFM_SUBTYPE_TOKENRING_DESCRIPTIONS; 443 444struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] = 445 IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS; 446 447struct ifmedia_description ifm_subtype_fddi_descriptions[] = 448 IFM_SUBTYPE_FDDI_DESCRIPTIONS; 449 450struct ifmedia_description ifm_subtype_fddi_option_descriptions[] = 451 IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS; 452 453struct ifmedia_description ifm_subtype_ieee80211_descriptions[] = 454 IFM_SUBTYPE_IEEE80211_DESCRIPTIONS; 455 456struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] = 457 IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS; 458 459struct ifmedia_description ifm_subtype_ieee80211_mode_descriptions[] = 460 IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS; 461 462struct ifmedia_description ifm_subtype_atm_descriptions[] = 463 IFM_SUBTYPE_ATM_DESCRIPTIONS; 464 465struct ifmedia_description ifm_subtype_atm_option_descriptions[] = 466 IFM_SUBTYPE_ATM_OPTION_DESCRIPTIONS; 467 468struct ifmedia_description ifm_subtype_shared_descriptions[] = 469 IFM_SUBTYPE_SHARED_DESCRIPTIONS; 470 471struct ifmedia_description ifm_shared_option_descriptions[] = 472 IFM_SHARED_OPTION_DESCRIPTIONS; 473 474struct ifmedia_type_to_subtype { 475 struct ifmedia_description *subtypes; 476 struct ifmedia_description *options; 477 struct ifmedia_description *modes; 478}; 479 480/* must be in the same order as IFM_TYPE_DESCRIPTIONS */ 481struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = { 482 { 483 &ifm_subtype_ethernet_descriptions[0], 484 &ifm_subtype_ethernet_option_descriptions[0], 485 NULL, 486 }, 487 { 488 &ifm_subtype_tokenring_descriptions[0], 489 &ifm_subtype_tokenring_option_descriptions[0], 490 NULL, 491 }, 492 { 493 &ifm_subtype_fddi_descriptions[0], 494 &ifm_subtype_fddi_option_descriptions[0], 495 NULL, 496 }, 497 { 498 &ifm_subtype_ieee80211_descriptions[0], 499 &ifm_subtype_ieee80211_option_descriptions[0], 500 &ifm_subtype_ieee80211_mode_descriptions[0] 501 }, 502 { 503 &ifm_subtype_atm_descriptions[0], 504 &ifm_subtype_atm_option_descriptions[0], 505 NULL, 506 }, 507}; 508 509/* 510 * print a media word. 511 */ 512static void 513ifmedia_printword(ifmw) 514 int ifmw; 515{ 516 struct ifmedia_description *desc; 517 struct ifmedia_type_to_subtype *ttos; 518 int seen_option = 0; 519 520 /* Find the top-level interface type. */ 521 for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes; 522 desc->ifmt_string != NULL; desc++, ttos++) 523 if (IFM_TYPE(ifmw) == desc->ifmt_word) 524 break; 525 if (desc->ifmt_string == NULL) { 526 printf("<unknown type>\n"); 527 return; 528 } 529 printf("%s", desc->ifmt_string); 530 531 /* Any mode. */ 532 for (desc = ttos->modes; desc && desc->ifmt_string != NULL; desc++) 533 if (IFM_MODE(ifmw) == desc->ifmt_word) { 534 if (desc->ifmt_string != NULL) 535 printf(" mode %s", desc->ifmt_string); 536 break; 537 } 538 539 /* 540 * Check for the shared subtype descriptions first, then the 541 * type-specific ones. 542 */ 543 for (desc = ifm_subtype_shared_descriptions; 544 desc->ifmt_string != NULL; desc++) 545 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word) 546 goto got_subtype; 547 548 for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++) 549 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word) 550 break; 551 if (desc->ifmt_string == NULL) { 552 printf(" <unknown subtype>\n"); 553 return; 554 } 555 556 got_subtype: 557 printf(" %s", desc->ifmt_string); 558 559 /* 560 * Look for shared options. 561 */ 562 for (desc = ifm_shared_option_descriptions; 563 desc->ifmt_string != NULL; desc++) { 564 if (ifmw & desc->ifmt_word) { 565 if (seen_option == 0) 566 printf(" <"); 567 printf("%s%s", seen_option++ ? "," : "", 568 desc->ifmt_string); 569 } 570 } 571 572 /* 573 * Look for subtype-specific options. 574 */ 575 for (desc = ttos->options; desc->ifmt_string != NULL; desc++) { 576 if (ifmw & desc->ifmt_word) { 577 if (seen_option == 0) 578 printf(" <"); 579 printf("%s%s", seen_option++ ? "," : "", 580 desc->ifmt_string); 581 } 582 } 583 printf("%s\n", seen_option ? ">" : ""); 584} 585#endif /* IFMEDIA_DEBUG */ 586