sys/net/if_media.c

   1 /*      $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $     */
   2 /* $FreeBSD: src/sys/net/if_media.c,v 1.9.2.4 2001/07/04 00:12:38 brooks Exp $ */
   3 /* $DragonFly: src/sys/net/if_media.c,v 1.15 2007/08/27 16:15:42 hasso Exp $ */
   4
   5 /*
   6  * Copyright (c) 1997
   7  *      Jonathan Stone and Jason R. Thorpe.  All rights reserved.
   8  *
   9  * This software is derived from information provided by Matt Thomas.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by Jonathan Stone
  22  *      and Jason R. Thorpe for the NetBSD Project.
  23  * 4. The names of the authors may not be used to endorse or promote products
  24  *    derived from this software without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  27  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  28  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  29  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  30  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  31  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  32  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  33  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  34  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  */
  38
  39 /*
  40  * BSD/OS-compatible network interface media selection.
  41  *
  42  * Where it is safe to do so, this code strays slightly from the BSD/OS
  43  * design.  Software which uses the API (device drivers, basically)
  44  * shouldn't notice any difference.
  45  *
  46  * Many thanks to Matt Thomas for providing the information necessary
  47  * to implement this interface.
  48  */
  49
  50 #include <sys/param.h>
  51 #include <sys/systm.h>
  52 #include <sys/socket.h>
  53 #include <sys/sockio.h>
  54 #include <sys/malloc.h>
  55
  56 #include <net/if.h>
  57 #include <net/if_media.h>
  58
  59 /*
  60  * Compile-time options:
  61  * IFMEDIA_DEBUG:
  62  *      turn on implementation-level debug kprintfs.
  63  *      Useful for debugging newly-ported  drivers.
  64  */
  65
  66 static struct ifmedia_entry *ifmedia_match (struct ifmedia *ifm,
  67     int flags, int mask);
  68
  69 #ifdef IFMEDIA_DEBUG
  70 int     ifmedia_debug = 0;
  71 static  void ifmedia_printword (int);
  72 #endif
  73
  74 /*
  75  * Initialize if_media struct for a specific interface instance.
  76  */
  77 void
  78 ifmedia_init(struct ifmedia *ifm, int dontcare_mask,
  79              ifm_change_cb_t change_callback, ifm_stat_cb_t status_callback)
  80 {
  81
  82         LIST_INIT(&ifm->ifm_list);
  83         ifm->ifm_cur = NULL;
  84         ifm->ifm_media = 0;
  85         ifm->ifm_mask = dontcare_mask;          /* IF don't-care bits */
  86         ifm->ifm_change = change_callback;
  87         ifm->ifm_status = status_callback;
  88 }
  89
  90 void
  91 ifmedia_removeall(struct ifmedia *ifm)
  92 {
  93         struct ifmedia_entry *entry;
  94
  95         for (entry = LIST_FIRST(&ifm->ifm_list); entry;
  96              entry = LIST_FIRST(&ifm->ifm_list)) {
  97                 LIST_REMOVE(entry, ifm_list);
  98                 kfree(entry, M_IFADDR);
  99         }
 100 }
 101
 102 /*
 103  * Add a media configuration to the list of supported media
 104  * for a specific interface instance.
 105  */
 106 void
 107 ifmedia_add(struct ifmedia *ifm, int mword, int data, void *aux)
 108 {
 109         struct ifmedia_entry *entry;
 110
 111 #ifdef IFMEDIA_DEBUG
 112         if (ifmedia_debug) {
 113                 if (ifm == NULL) {
 114                         kprintf("ifmedia_add: null ifm\n");
 115                         return;
 116                 }
 117                 kprintf("Adding entry for ");
 118                 ifmedia_printword(mword);
 119         }
 120 #endif
 121
 122         entry = kmalloc(sizeof(*entry), M_IFADDR, M_INTWAIT);
 123         entry->ifm_media = mword;
 124         entry->ifm_data = data;
 125         entry->ifm_aux = aux;
 126
 127         LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list);
 128 }
 129
 130 /*
 131  * Add an array of media configurations to the list of
 132  * supported media for a specific interface instance.
 133  */
 134 void
 135 ifmedia_list_add(struct ifmedia *ifm, struct ifmedia_entry *lp,
 136                  int count)
 137 {
 138         int i;
 139
 140         for (i = 0; i < count; i++)
 141                 ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data,
 142                     lp[i].ifm_aux);
 143 }
 144
 145 /*
 146  * Set the default active media.
 147  *
 148  * Called by device-specific code which is assumed to have already
 149  * selected the default media in hardware.  We do _not_ call the
 150  * media-change callback.
 151  */
 152 void
 153 ifmedia_set(struct ifmedia *ifm, int target)
 154 {
 155         struct ifmedia_entry *match;
 156
 157         match = ifmedia_match(ifm, target, ifm->ifm_mask);
 158
 159         if (match == NULL) {
 160                 kprintf("ifmedia_set: no match for 0x%x/0x%x\n",
 161                     target, ~ifm->ifm_mask);
 162                 panic("ifmedia_set");
 163         }
 164         ifm->ifm_cur = match;
 165
 166 #ifdef IFMEDIA_DEBUG
 167         if (ifmedia_debug) {
 168                 kprintf("ifmedia_set: target ");
 169                 ifmedia_printword(target);
 170                 kprintf("ifmedia_set: setting to ");
 171                 ifmedia_printword(ifm->ifm_cur->ifm_media);
 172         }
 173 #endif
 174 }
 175
 176 /*
 177  * Device-independent media ioctl support function, typically called
 178  * from the device network ioctl procedure.
 179  */
 180 int
 181 ifmedia_ioctl(struct ifnet *ifp, struct ifreq *ifr,
 182               struct ifmedia *ifm, u_long cmd)
 183 {
 184         struct ifmedia_entry *match;
 185         struct ifmediareq *ifmr = (struct ifmediareq *) ifr;
 186         int error = 0, sticky;
 187
 188         if (ifp == NULL || ifr == NULL || ifm == NULL)
 189                 return (EINVAL);
 190
 191         ASSERT_SERIALIZED(ifp->if_serializer);
 192
 193         switch (cmd) {
 194         /*
 195          * Set the current media.
 196          */
 197         case  SIOCSIFMEDIA:
 198         {
 199                 struct ifmedia_entry *oldentry;
 200                 int oldmedia;
 201                 int newmedia = ifr->ifr_media;
 202
 203                 match = ifmedia_match(ifm, newmedia, ifm->ifm_mask);
 204                 if (match == NULL) {
 205 #ifdef IFMEDIA_DEBUG
 206                         if (ifmedia_debug) {
 207                                 kprintf(
 208                                     "ifmedia_ioctl: no media found for 0x%x\n",
 209                                     newmedia);
 210                         }
 211 #endif
 212                         return (ENXIO);
 213                 }
 214
 215                 /*
 216                  * If no change, we're done.
 217                  * XXX Automedia may invole software intervention.
 218                  *     Keep going in case the the connected media changed.
 219                  *     Similarly, if best match changed (kernel debugger?).
 220                  */
 221                 if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) &&
 222                     (newmedia == ifm->ifm_media) &&
 223                     (match == ifm->ifm_cur))
 224                         return 0;
 225
 226                 /*
 227                  * We found a match, now make the driver switch to it.
 228                  * Make sure to preserve our old media type in case the
 229                  * driver can't switch.
 230                  */
 231 #ifdef IFMEDIA_DEBUG
 232                 if (ifmedia_debug) {
 233                         kprintf("ifmedia_ioctl: switching %s to ",
 234                             ifp->if_xname);
 235                         ifmedia_printword(match->ifm_media);
 236                 }
 237 #endif
 238                 oldentry = ifm->ifm_cur;
 239                 oldmedia = ifm->ifm_media;
 240                 ifm->ifm_cur = match;
 241                 ifm->ifm_media = newmedia;
 242                 error = (*ifm->ifm_change)(ifp);
 243                 if (error) {
 244                         ifm->ifm_cur = oldentry;
 245                         ifm->ifm_media = oldmedia;
 246                 }
 247                 break;
 248         }
 249
 250         /*
 251          * Get list of available media and current media on interface.
 252          */
 253         case  SIOCGIFMEDIA:
 254         {
 255                 struct ifmedia_entry *ep;
 256                 int *kptr, count;
 257                 int usermax;    /* user requested max */
 258
 259                 kptr = NULL;            /* XXX gcc */
 260
 261                 ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ?
 262                     ifm->ifm_cur->ifm_media : IFM_NONE;
 263                 ifmr->ifm_mask = ifm->ifm_mask;
 264                 ifmr->ifm_status = 0;
 265                 (*ifm->ifm_status)(ifp, ifmr);
 266
 267                 count = 0;
 268                 usermax = 0;
 269
 270                 /*
 271                  * If there are more interfaces on the list, count
 272                  * them.  This allows the caller to set ifmr->ifm_count
 273                  * to 0 on the first call to know how much space to
 274                  * allocate.
 275                  */
 276                 LIST_FOREACH(ep, &ifm->ifm_list, ifm_list)
 277                         usermax++;
 278
 279                 /*
 280                  * Don't allow the user to ask for too many
 281                  * or a negative number.
 282                  */
 283                 if (ifmr->ifm_count > usermax)
 284                         ifmr->ifm_count = usermax;
 285                 else if (ifmr->ifm_count < 0)
 286                         return (EINVAL);
 287
 288                 if (ifmr->ifm_count != 0) {
 289                         kptr = (int *)kmalloc(ifmr->ifm_count * sizeof(int),
 290                             M_TEMP, M_WAITOK);
 291
 292                         /*
 293                          * Get the media words from the interface's list.
 294                          */
 295                         ep = LIST_FIRST(&ifm->ifm_list);
 296                         for (; ep != NULL && count < ifmr->ifm_count;
 297                             ep = LIST_NEXT(ep, ifm_list), count++)
 298                                 kptr[count] = ep->ifm_media;
 299
 300                         if (ep != NULL)
 301                                 error = E2BIG;  /* oops! */
 302                 } else {
 303                         count = usermax;
 304                 }
 305
 306                 /*
 307                  * We do the copyout on E2BIG, because that's
 308                  * just our way of telling userland that there
 309                  * are more.  This is the behavior I've observed
 310                  * under BSD/OS 3.0
 311                  */
 312                 sticky = error;
 313                 if ((error == 0 || error == E2BIG) && ifmr->ifm_count != 0) {
 314                         error = copyout((caddr_t)kptr,
 315                             (caddr_t)ifmr->ifm_ulist,
 316                             ifmr->ifm_count * sizeof(int));
 317                 }
 318
 319                 if (error == 0)
 320                         error = sticky;
 321
 322                 if (ifmr->ifm_count != 0)
 323                         kfree(kptr, M_TEMP);
 324
 325                 ifmr->ifm_count = count;
 326                 break;
 327         }
 328
 329         default:
 330                 return (EINVAL);
 331         }
 332
 333         return (error);
 334 }
 335
 336 /*
 337  * Find media entry matching a given ifm word.
 338  *
 339  */
 340 static struct ifmedia_entry *
 341 ifmedia_match(struct ifmedia *ifm, int target, int mask)
 342 {
 343         struct ifmedia_entry *match, *next;
 344
 345         match = NULL;
 346         mask = ~mask;
 347
 348         LIST_FOREACH(next, &ifm->ifm_list, ifm_list) {
 349                 if ((next->ifm_media & mask) == (target & mask)) {
 350 #if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC)
 351                         if (match) {
 352                                 kprintf("ifmedia_match: multiple match for "
 353                                     "0x%x/0x%x\n", target, mask);
 354                         }
 355 #endif
 356                         match = next;
 357                 }
 358         }
 359
 360         return match;
 361 }
 362
 363 struct ifmedia_baudrate ifmedia_baudrate_descriptions[] =
 364     IFM_BAUDRATE_DESCRIPTIONS;
 365
 366 int
 367 ifmedia_baudrate(int mword)
 368 {
 369         int i;
 370
 371         for (i = 0; ifmedia_baudrate_descriptions[i].ifmb_word != 0; i++) {
 372                 if ((mword & (IFM_NMASK|IFM_TMASK)) ==
 373                     ifmedia_baudrate_descriptions[i].ifmb_word)
 374                         return (ifmedia_baudrate_descriptions[i].ifmb_baudrate);
 375         }
 376
 377         /* Not known. */
 378         return (0);
 379 }
 380
 381 #ifdef IFMEDIA_DEBUG
 382 struct ifmedia_description ifm_type_descriptions[] =
 383     IFM_TYPE_DESCRIPTIONS;
 384
 385 struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
 386     IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
 387
 388 struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
 389     IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
 390
 391 struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
 392     IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
 393
 394 struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] =
 395     IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;
 396
 397 struct ifmedia_description ifm_subtype_shared_descriptions[] =
 398     IFM_SUBTYPE_SHARED_DESCRIPTIONS;
 399
 400 struct ifmedia_description ifm_shared_option_descriptions[] =
 401     IFM_SHARED_OPTION_DESCRIPTIONS;
 402
 403 struct ifmedia_type_to_subtype {
 404         struct ifmedia_description *subtypes;
 405         struct ifmedia_description *options;
 406 };
 407
 408 /* must be in the same order as IFM_TYPE_DESCRIPTIONS */
 409 struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
 410         {
 411           &ifm_subtype_ethernet_descriptions[0],
 412           &ifm_subtype_ethernet_option_descriptions[0]
 413         },
 414         {
 415           &ifm_subtype_ieee80211_descriptions[0],
 416           &ifm_subtype_ieee80211_option_descriptions[0]
 417         },
 418 };
 419
 420 /*
 421  * print a media word.
 422  */
 423 static void
 424 ifmedia_printword(int ifmw)
 425 {
 426         struct ifmedia_description *desc;
 427         struct ifmedia_type_to_subtype *ttos;
 428         int seen_option = 0;
 429
 430         /* Find the top-level interface type. */
 431         for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
 432             desc->ifmt_string != NULL; desc++, ttos++)
 433                 if (IFM_TYPE(ifmw) == desc->ifmt_word)
 434                         break;
 435         if (desc->ifmt_string == NULL) {
 436                 kprintf("<unknown type>\n");
 437                 return;
 438         }
 439         kprintf(desc->ifmt_string);
 440
 441         /*
 442          * Check for the shared subtype descriptions first, then the
 443          * type-specific ones.
 444          */
 445         for (desc = ifm_subtype_shared_descriptions;
 446             desc->ifmt_string != NULL; desc++)
 447                 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
 448                         goto got_subtype;
 449
 450         for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++)
 451                 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
 452                         break;
 453         if (desc->ifmt_string == NULL) {
 454                 kprintf(" <unknown subtype>\n");
 455                 return;
 456         }
 457
 458  got_subtype:
 459         kprintf(" %s", desc->ifmt_string);
 460
 461         /*
 462          * Look for shared options.
 463          */
 464         for (desc = ifm_shared_option_descriptions;
 465             desc->ifmt_string != NULL; desc++) {
 466                 if (ifmw & desc->ifmt_word) {
 467                         if (seen_option == 0)
 468                                 kprintf(" <");
 469                         kprintf("%s%s", seen_option++ ? "," : "",
 470                             desc->ifmt_string);
 471                 }
 472         }
 473
 474         /*
 475          * Look for subtype-specific options.
 476          */
 477         for (desc = ttos->options; desc->ifmt_string != NULL; desc++) {
 478                 if (ifmw & desc->ifmt_word) {
 479                         if (seen_option == 0)
 480                                 kprintf(" <");
 481                         kprintf("%s%s", seen_option++ ? "," : "",
 482                             desc->ifmt_string);
 483                 }
 484         }
 485         kprintf("%s\n", seen_option ? ">" : "");
 486 }
 487 #endif /* IFMEDIA_DEBUG */