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