1 /* $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $ */ 2 /* $FreeBSD$ */ 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 55 #include <net/if.h> 56 #include <net/if_media.h> 57 58 /* 59 * Compile-time options: 60 * IFMEDIA_DEBUG: 61 * turn on implementation-level debug printfs. 62 * Useful for debugging newly-ported drivers. 63 */ 64 65 static struct ifmedia_entry *ifmedia_match __P((struct ifmedia *ifm, 66 int flags, int mask)); 67 68 #ifdef IFMEDIA_DEBUG 69 int ifmedia_debug = 0; 70 static void ifmedia_printword __P((int)); 71 #endif 72 73 /* 74 * Initialize if_media struct for a specific interface instance. 75 */ 76 void 77 ifmedia_init(ifm, dontcare_mask, change_callback, status_callback) 78 struct ifmedia *ifm; 79 int dontcare_mask; 80 ifm_change_cb_t change_callback; 81 ifm_stat_cb_t status_callback; 82 { 83 84 LIST_INIT(&ifm->ifm_list); 85 ifm->ifm_cur = NULL; 86 ifm->ifm_media = 0; 87 ifm->ifm_mask = dontcare_mask; /* IF don't-care bits */ 88 ifm->ifm_change = change_callback; 89 ifm->ifm_status = status_callback; 90 } 91 92 void 93 ifmedia_removeall(ifm) 94 struct ifmedia *ifm; 95 { 96 struct ifmedia_entry *entry; 97 98 for (entry = LIST_FIRST(&ifm->ifm_list); entry; 99 entry = LIST_FIRST(&ifm->ifm_list)) { 100 LIST_REMOVE(entry, ifm_list); 101 free(entry, M_IFADDR); 102 } 103 } 104 105 /* 106 * Add a media configuration to the list of supported media 107 * for a specific interface instance. 108 */ 109 void 110 ifmedia_add(ifm, mword, data, aux) 111 struct ifmedia *ifm; 112 int mword; 113 int data; 114 void *aux; 115 { 116 register struct ifmedia_entry *entry; 117 118 #ifdef IFMEDIA_DEBUG 119 if (ifmedia_debug) { 120 if (ifm == NULL) { 121 printf("ifmedia_add: null ifm\n"); 122 return; 123 } 124 printf("Adding entry for "); 125 ifmedia_printword(mword); 126 } 127 #endif 128 129 entry = malloc(sizeof(*entry), M_IFADDR, M_NOWAIT); 130 if (entry == NULL) 131 panic("ifmedia_add: can't malloc entry"); 132 133 entry->ifm_media = mword; 134 entry->ifm_data = data; 135 entry->ifm_aux = aux; 136 137 LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list); 138 } 139 140 /* 141 * Add an array of media configurations to the list of 142 * supported media for a specific interface instance. 143 */ 144 void 145 ifmedia_list_add(ifm, lp, count) 146 struct ifmedia *ifm; 147 struct ifmedia_entry *lp; 148 int count; 149 { 150 int i; 151 152 for (i = 0; i < count; i++) 153 ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data, 154 lp[i].ifm_aux); 155 } 156 157 /* 158 * Set the default active media. 159 * 160 * Called by device-specific code which is assumed to have already 161 * selected the default media in hardware. We do _not_ call the 162 * media-change callback. 163 */ 164 void 165 ifmedia_set(ifm, target) 166 struct ifmedia *ifm; 167 int target; 168 169 { 170 struct ifmedia_entry *match; 171 172 match = ifmedia_match(ifm, target, ifm->ifm_mask); 173 174 if (match == NULL) { 175 printf("ifmedia_set: no match for 0x%x/0x%x\n", 176 target, ~ifm->ifm_mask); 177 panic("ifmedia_set"); 178 } 179 ifm->ifm_cur = match; 180 181 #ifdef IFMEDIA_DEBUG 182 if (ifmedia_debug) { 183 printf("ifmedia_set: target "); 184 ifmedia_printword(target); 185 printf("ifmedia_set: setting to "); 186 ifmedia_printword(ifm->ifm_cur->ifm_media); 187 } 188 #endif 189 } 190 191 /* 192 * Device-independent media ioctl support function. 193 */ 194 int 195 ifmedia_ioctl(ifp, ifr, ifm, cmd) 196 struct ifnet *ifp; 197 struct ifreq *ifr; 198 struct ifmedia *ifm; 199 u_long cmd; 200 { 201 struct ifmedia_entry *match; 202 struct ifmediareq *ifmr = (struct ifmediareq *) ifr; 203 int error = 0, sticky; 204 205 if (ifp == NULL || ifr == NULL || ifm == NULL) 206 return(EINVAL); 207 208 switch (cmd) { 209 210 /* 211 * Set the current media. 212 */ 213 case SIOCSIFMEDIA: 214 { 215 struct ifmedia_entry *oldentry; 216 int oldmedia; 217 int newmedia = ifr->ifr_media; 218 219 match = ifmedia_match(ifm, newmedia, ifm->ifm_mask); 220 if (match == NULL) { 221 #ifdef IFMEDIA_DEBUG 222 if (ifmedia_debug) { 223 printf( 224 "ifmedia_ioctl: no media found for 0x%x\n", 225 newmedia); 226 } 227 #endif 228 return (ENXIO); 229 } 230 231 /* 232 * If no change, we're done. 233 * XXX Automedia may invole software intervention. 234 * Keep going in case the the connected media changed. 235 * Similarly, if best match changed (kernel debugger?). 236 */ 237 if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) && 238 (newmedia == ifm->ifm_media) && 239 (match == ifm->ifm_cur)) 240 return 0; 241 242 /* 243 * We found a match, now make the driver switch to it. 244 * Make sure to preserve our old media type in case the 245 * driver can't switch. 246 */ 247 #ifdef IFMEDIA_DEBUG 248 if (ifmedia_debug) { 249 printf("ifmedia_ioctl: switching %s%d to ", 250 ifp->if_name, ifp->if_unit); 251 ifmedia_printword(match->ifm_media); 252 } 253 #endif 254 oldentry = ifm->ifm_cur; 255 oldmedia = ifm->ifm_media; 256 ifm->ifm_cur = match; 257 ifm->ifm_media = newmedia; 258 error = (*ifm->ifm_change)(ifp); 259 if (error) { 260 ifm->ifm_cur = oldentry; 261 ifm->ifm_media = oldmedia; 262 } 263 break; 264 } 265 266 /* 267 * Get list of available media and current media on interface. 268 */ 269 case SIOCGIFMEDIA: 270 { 271 struct ifmedia_entry *ep; 272 int *kptr, count; 273 int usermax; /* user requested max */ 274 275 kptr = NULL; /* XXX gcc */ 276 277 ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ? 278 ifm->ifm_cur->ifm_media : IFM_NONE; 279 ifmr->ifm_mask = ifm->ifm_mask; 280 ifmr->ifm_status = 0; 281 (*ifm->ifm_status)(ifp, ifmr); 282 283 count = 0; 284 usermax = 0; 285 286 /* 287 * If there are more interfaces on the list, count 288 * them. This allows the caller to set ifmr->ifm_count 289 * to 0 on the first call to know how much space to 290 * allocate. 291 */ 292 LIST_FOREACH(ep, &ifm->ifm_list, ifm_list) 293 usermax++; 294 295 /* 296 * Don't allow the user to ask for too many 297 * or a negative number. 298 */ 299 if (ifmr->ifm_count > usermax) 300 ifmr->ifm_count = usermax; 301 else if (ifmr->ifm_count < 0) 302 return (EINVAL); 303 304 if (ifmr->ifm_count != 0) { 305 kptr = (int *)malloc(ifmr->ifm_count * sizeof(int), 306 M_TEMP, M_WAITOK); 307 308 /* 309 * Get the media words from the interface's list. 310 */ 311 ep = LIST_FIRST(&ifm->ifm_list); 312 for (; ep != NULL && count < ifmr->ifm_count; 313 ep = LIST_NEXT(ep, ifm_list), count++) 314 kptr[count] = ep->ifm_media; 315 316 if (ep != NULL) 317 error = E2BIG; /* oops! */ 318 } else { 319 count = usermax; 320 } 321 322 /* 323 * We do the copyout on E2BIG, because that's 324 * just our way of telling userland that there 325 * are more. This is the behavior I've observed 326 * under BSD/OS 3.0 327 */ 328 sticky = error; 329 if ((error == 0 || error == E2BIG) && ifmr->ifm_count != 0) { 330 error = copyout((caddr_t)kptr, 331 (caddr_t)ifmr->ifm_ulist, 332 ifmr->ifm_count * sizeof(int)); 333 } 334 335 if (error == 0) 336 error = sticky; 337 338 if (ifmr->ifm_count != 0) 339 free(kptr, M_TEMP); 340 341 ifmr->ifm_count = count; 342 break; 343 } 344 345 default: 346 return (EINVAL); 347 } 348 349 return (error); 350 } 351 352 /* 353 * Find media entry matching a given ifm word. 354 * 355 */ 356 static struct ifmedia_entry * 357 ifmedia_match(ifm, target, mask) 358 struct ifmedia *ifm; 359 int target; 360 int mask; 361 { 362 struct ifmedia_entry *match, *next; 363 364 match = NULL; 365 mask = ~mask; 366 367 LIST_FOREACH(next, &ifm->ifm_list, ifm_list) { 368 if ((next->ifm_media & mask) == (target & mask)) { 369 #if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC) 370 if (match) { 371 printf("ifmedia_match: multiple match for " 372 "0x%x/0x%x\n", target, mask); 373 } 374 #endif 375 match = next; 376 } 377 } 378 379 return match; 380 } 381 382 #ifdef IFMEDIA_DEBUG 383 struct ifmedia_description ifm_type_descriptions[] = 384 IFM_TYPE_DESCRIPTIONS; 385 386 struct ifmedia_description ifm_subtype_ethernet_descriptions[] = 387 IFM_SUBTYPE_ETHERNET_DESCRIPTIONS; 388 389 struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] = 390 IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS; 391 392 struct ifmedia_description ifm_subtype_tokenring_descriptions[] = 393 IFM_SUBTYPE_TOKENRING_DESCRIPTIONS; 394 395 struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] = 396 IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS; 397 398 struct ifmedia_description ifm_subtype_fddi_descriptions[] = 399 IFM_SUBTYPE_FDDI_DESCRIPTIONS; 400 401 struct ifmedia_description ifm_subtype_fddi_option_descriptions[] = 402 IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS; 403 404 struct ifmedia_description ifm_subtype_ieee80211_descriptions[] = 405 IFM_SUBTYPE_IEEE80211_DESCRIPTIONS; 406 407 struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] = 408 IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS; 409 410 struct ifmedia_description ifm_subtype_shared_descriptions[] = 411 IFM_SUBTYPE_SHARED_DESCRIPTIONS; 412 413 struct ifmedia_description ifm_shared_option_descriptions[] = 414 IFM_SHARED_OPTION_DESCRIPTIONS; 415 416 struct ifmedia_type_to_subtype { 417 struct ifmedia_description *subtypes; 418 struct ifmedia_description *options; 419 }; 420 421 /* must be in the same order as IFM_TYPE_DESCRIPTIONS */ 422 struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = { 423 { 424 &ifm_subtype_ethernet_descriptions[0], 425 &ifm_subtype_ethernet_option_descriptions[0] 426 }, 427 { 428 &ifm_subtype_tokenring_descriptions[0], 429 &ifm_subtype_tokenring_option_descriptions[0] 430 }, 431 { 432 &ifm_subtype_fddi_descriptions[0], 433 &ifm_subtype_fddi_option_descriptions[0] 434 }, 435 { 436 &ifm_subtype_ieee80211_descriptions[0], 437 &ifm_subtype_ieee80211_option_descriptions[0] 438 }, 439 }; 440 441 /* 442 * print a media word. 443 */ 444 static void 445 ifmedia_printword(ifmw) 446 int ifmw; 447 { 448 struct ifmedia_description *desc; 449 struct ifmedia_type_to_subtype *ttos; 450 int seen_option = 0; 451 452 /* Find the top-level interface type. */ 453 for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes; 454 desc->ifmt_string != NULL; desc++, ttos++) 455 if (IFM_TYPE(ifmw) == desc->ifmt_word) 456 break; 457 if (desc->ifmt_string == NULL) { 458 printf("<unknown type>\n"); 459 return; 460 } 461 printf(desc->ifmt_string); 462 463 /* 464 * Check for the shared subtype descriptions first, then the 465 * type-specific ones. 466 */ 467 for (desc = ifm_subtype_shared_descriptions; 468 desc->ifmt_string != NULL; desc++) 469 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word) 470 goto got_subtype; 471 472 for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++) 473 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word) 474 break; 475 if (desc->ifmt_string == NULL) { 476 printf(" <unknown subtype>\n"); 477 return; 478 } 479 480 got_subtype: 481 printf(" %s", desc->ifmt_string); 482 483 /* 484 * Look for shared options. 485 */ 486 for (desc = ifm_shared_option_descriptions; 487 desc->ifmt_string != NULL; desc++) { 488 if (ifmw & desc->ifmt_word) { 489 if (seen_option == 0) 490 printf(" <"); 491 printf("%s%s", seen_option++ ? "," : "", 492 desc->ifmt_string); 493 } 494 } 495 496 /* 497 * Look for subtype-specific options. 498 */ 499 for (desc = ttos->options; desc->ifmt_string != NULL; desc++) { 500 if (ifmw & desc->ifmt_word) { 501 if (seen_option == 0) 502 printf(" <"); 503 printf("%s%s", seen_option++ ? "," : "", 504 desc->ifmt_string); 505 } 506 } 507 printf("%s\n", seen_option ? ">" : ""); 508 } 509 #endif /* IFMEDIA_DEBUG */ 510