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FreeBSD/Linux Kernel Cross Reference
sys/net/if_media.c

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    1 /*      $NetBSD: if_media.c,v 1.1 1997/03/17 02:55:15 thorpej Exp $     */
    2 /* $FreeBSD: releng/8.2/sys/net/if_media.c 155669 2006-02-14 12:10:03Z glebius $ */
    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 
   67 static struct ifmedia_entry *ifmedia_match(struct ifmedia *ifm,
   68     int flags, int mask);
   69 
   70 #ifdef IFMEDIA_DEBUG
   71 int     ifmedia_debug = 0;
   72 SYSCTL_INT(_debug, OID_AUTO, ifmedia, CTLFLAG_RW, &ifmedia_debug,
   73             0, "if_media debugging msgs");
   74 static  void ifmedia_printword(int);
   75 #endif
   76 
   77 /*
   78  * Initialize if_media struct for a specific interface instance.
   79  */
   80 void
   81 ifmedia_init(ifm, dontcare_mask, change_callback, status_callback)
   82         struct ifmedia *ifm;
   83         int dontcare_mask;
   84         ifm_change_cb_t change_callback;
   85         ifm_stat_cb_t status_callback;
   86 {
   87 
   88         LIST_INIT(&ifm->ifm_list);
   89         ifm->ifm_cur = NULL;
   90         ifm->ifm_media = 0;
   91         ifm->ifm_mask = dontcare_mask;          /* IF don't-care bits */
   92         ifm->ifm_change = change_callback;
   93         ifm->ifm_status = status_callback;
   94 }
   95 
   96 void
   97 ifmedia_removeall(ifm)
   98         struct ifmedia *ifm;
   99 {
  100         struct ifmedia_entry *entry;
  101 
  102         for (entry = LIST_FIRST(&ifm->ifm_list); entry;
  103              entry = LIST_FIRST(&ifm->ifm_list)) {
  104                 LIST_REMOVE(entry, ifm_list);
  105                 free(entry, M_IFADDR);
  106         }
  107 }
  108 
  109 /*
  110  * Add a media configuration to the list of supported media
  111  * for a specific interface instance.
  112  */
  113 void
  114 ifmedia_add(ifm, mword, data, aux)
  115         struct ifmedia *ifm;
  116         int mword;
  117         int data;
  118         void *aux;
  119 {
  120         register struct ifmedia_entry *entry;
  121 
  122 #ifdef IFMEDIA_DEBUG
  123         if (ifmedia_debug) {
  124                 if (ifm == NULL) {
  125                         printf("ifmedia_add: null ifm\n");
  126                         return;
  127                 }
  128                 printf("Adding entry for ");
  129                 ifmedia_printword(mword);
  130         }
  131 #endif
  132 
  133         entry = malloc(sizeof(*entry), M_IFADDR, M_NOWAIT);
  134         if (entry == NULL)
  135                 panic("ifmedia_add: can't malloc entry");
  136 
  137         entry->ifm_media = mword;
  138         entry->ifm_data = data;
  139         entry->ifm_aux = aux;
  140 
  141         LIST_INSERT_HEAD(&ifm->ifm_list, entry, ifm_list);
  142 }
  143 
  144 /*
  145  * Add an array of media configurations to the list of
  146  * supported media for a specific interface instance.
  147  */
  148 void
  149 ifmedia_list_add(ifm, lp, count)
  150         struct ifmedia *ifm;
  151         struct ifmedia_entry *lp;
  152         int count;
  153 {
  154         int i;
  155 
  156         for (i = 0; i < count; i++)
  157                 ifmedia_add(ifm, lp[i].ifm_media, lp[i].ifm_data,
  158                     lp[i].ifm_aux);
  159 }
  160 
  161 /*
  162  * Set the default active media. 
  163  *
  164  * Called by device-specific code which is assumed to have already
  165  * selected the default media in hardware.  We do _not_ call the
  166  * media-change callback.
  167  */
  168 void
  169 ifmedia_set(ifm, target)
  170         struct ifmedia *ifm; 
  171         int target;
  172 
  173 {
  174         struct ifmedia_entry *match;
  175 
  176         match = ifmedia_match(ifm, target, ifm->ifm_mask);
  177 
  178         if (match == NULL) {
  179                 printf("ifmedia_set: no match for 0x%x/0x%x\n",
  180                     target, ~ifm->ifm_mask);
  181                 panic("ifmedia_set");
  182         }
  183         ifm->ifm_cur = match;
  184 
  185 #ifdef IFMEDIA_DEBUG
  186         if (ifmedia_debug) {
  187                 printf("ifmedia_set: target ");
  188                 ifmedia_printword(target);
  189                 printf("ifmedia_set: setting to ");
  190                 ifmedia_printword(ifm->ifm_cur->ifm_media);
  191         }
  192 #endif
  193 }
  194 
  195 /*
  196  * Device-independent media ioctl support function.
  197  */
  198 int
  199 ifmedia_ioctl(ifp, ifr, ifm, cmd)
  200         struct ifnet *ifp;
  201         struct ifreq *ifr;
  202         struct ifmedia *ifm;
  203         u_long cmd;
  204 {
  205         struct ifmedia_entry *match;
  206         struct ifmediareq *ifmr = (struct ifmediareq *) ifr;
  207         int error = 0, sticky;
  208 
  209         if (ifp == NULL || ifr == NULL || ifm == NULL)
  210                 return(EINVAL);
  211 
  212         switch (cmd) {
  213 
  214         /*
  215          * Set the current media.
  216          */
  217         case  SIOCSIFMEDIA:
  218         {
  219                 struct ifmedia_entry *oldentry;
  220                 int oldmedia;
  221                 int newmedia = ifr->ifr_media;
  222 
  223                 match = ifmedia_match(ifm, newmedia, ifm->ifm_mask);
  224                 if (match == NULL) {
  225 #ifdef IFMEDIA_DEBUG
  226                         if (ifmedia_debug) {
  227                                 printf(
  228                                     "ifmedia_ioctl: no media found for 0x%x\n", 
  229                                     newmedia);
  230                         }
  231 #endif
  232                         return (ENXIO);
  233                 }
  234 
  235                 /*
  236                  * If no change, we're done.
  237                  * XXX Automedia may invole software intervention.
  238                  *     Keep going in case the the connected media changed.
  239                  *     Similarly, if best match changed (kernel debugger?).
  240                  */
  241                 if ((IFM_SUBTYPE(newmedia) != IFM_AUTO) &&
  242                     (newmedia == ifm->ifm_media) &&
  243                     (match == ifm->ifm_cur))
  244                         return 0;
  245 
  246                 /*
  247                  * We found a match, now make the driver switch to it.
  248                  * Make sure to preserve our old media type in case the
  249                  * driver can't switch.
  250                  */
  251 #ifdef IFMEDIA_DEBUG
  252                 if (ifmedia_debug) {
  253                         printf("ifmedia_ioctl: switching %s to ",
  254                             ifp->if_xname);
  255                         ifmedia_printword(match->ifm_media);
  256                 }
  257 #endif
  258                 oldentry = ifm->ifm_cur;
  259                 oldmedia = ifm->ifm_media;
  260                 ifm->ifm_cur = match;
  261                 ifm->ifm_media = newmedia;
  262                 error = (*ifm->ifm_change)(ifp);
  263                 if (error) {
  264                         ifm->ifm_cur = oldentry;
  265                         ifm->ifm_media = oldmedia;
  266                 }
  267                 break;
  268         }
  269 
  270         /*
  271          * Get list of available media and current media on interface.
  272          */
  273         case  SIOCGIFMEDIA: 
  274         {
  275                 struct ifmedia_entry *ep;
  276                 int *kptr, count;
  277                 int usermax;    /* user requested max */
  278 
  279                 kptr = NULL;            /* XXX gcc */
  280 
  281                 ifmr->ifm_active = ifmr->ifm_current = ifm->ifm_cur ?
  282                     ifm->ifm_cur->ifm_media : IFM_NONE;
  283                 ifmr->ifm_mask = ifm->ifm_mask;
  284                 ifmr->ifm_status = 0;
  285                 (*ifm->ifm_status)(ifp, ifmr);
  286 
  287                 count = 0;
  288                 usermax = 0;
  289 
  290                 /*
  291                  * If there are more interfaces on the list, count
  292                  * them.  This allows the caller to set ifmr->ifm_count
  293                  * to 0 on the first call to know how much space to
  294                  * allocate.
  295                  */
  296                 LIST_FOREACH(ep, &ifm->ifm_list, ifm_list)
  297                         usermax++;
  298 
  299                 /*
  300                  * Don't allow the user to ask for too many
  301                  * or a negative number.
  302                  */
  303                 if (ifmr->ifm_count > usermax)
  304                         ifmr->ifm_count = usermax;
  305                 else if (ifmr->ifm_count < 0)
  306                         return (EINVAL);
  307 
  308                 if (ifmr->ifm_count != 0) {
  309                         kptr = (int *)malloc(ifmr->ifm_count * sizeof(int),
  310                             M_TEMP, M_NOWAIT);
  311 
  312                         if (kptr == NULL)
  313                                 return (ENOMEM);
  314                         /*
  315                          * Get the media words from the interface's list.
  316                          */
  317                         ep = LIST_FIRST(&ifm->ifm_list);
  318                         for (; ep != NULL && count < ifmr->ifm_count;
  319                             ep = LIST_NEXT(ep, ifm_list), count++)
  320                                 kptr[count] = ep->ifm_media;
  321 
  322                         if (ep != NULL)
  323                                 error = E2BIG;  /* oops! */
  324                 } else {
  325                         count = usermax;
  326                 }
  327 
  328                 /*
  329                  * We do the copyout on E2BIG, because that's
  330                  * just our way of telling userland that there
  331                  * are more.  This is the behavior I've observed
  332                  * under BSD/OS 3.0
  333                  */
  334                 sticky = error;
  335                 if ((error == 0 || error == E2BIG) && ifmr->ifm_count != 0) {
  336                         error = copyout((caddr_t)kptr,
  337                             (caddr_t)ifmr->ifm_ulist,
  338                             ifmr->ifm_count * sizeof(int));
  339                 }
  340 
  341                 if (error == 0)
  342                         error = sticky;
  343 
  344                 if (ifmr->ifm_count != 0)
  345                         free(kptr, M_TEMP);
  346 
  347                 ifmr->ifm_count = count;
  348                 break;
  349         }
  350 
  351         default:
  352                 return (EINVAL);
  353         }
  354 
  355         return (error);
  356 }
  357 
  358 /*
  359  * Find media entry matching a given ifm word.
  360  *
  361  */
  362 static struct ifmedia_entry *
  363 ifmedia_match(ifm, target, mask)
  364         struct ifmedia *ifm; 
  365         int target;
  366         int mask;
  367 {
  368         struct ifmedia_entry *match, *next;
  369 
  370         match = NULL;
  371         mask = ~mask;
  372 
  373         LIST_FOREACH(next, &ifm->ifm_list, ifm_list) {
  374                 if ((next->ifm_media & mask) == (target & mask)) {
  375 #if defined(IFMEDIA_DEBUG) || defined(DIAGNOSTIC)
  376                         if (match) {
  377                                 printf("ifmedia_match: multiple match for "
  378                                     "0x%x/0x%x\n", target, mask);
  379                         }
  380 #endif
  381                         match = next;
  382                 }
  383         }
  384 
  385         return match;
  386 }
  387 
  388 /*
  389  * Compute the interface `baudrate' from the media, for the interface
  390  * metrics (used by routing daemons).
  391  */
  392 static const struct ifmedia_baudrate ifmedia_baudrate_descriptions[] =   
  393     IFM_BAUDRATE_DESCRIPTIONS;
  394 
  395 uint64_t
  396 ifmedia_baudrate(int mword)
  397 {
  398         int i;
  399 
  400         for (i = 0; ifmedia_baudrate_descriptions[i].ifmb_word != 0; i++) {
  401                 if ((mword & (IFM_NMASK|IFM_TMASK)) ==
  402                     ifmedia_baudrate_descriptions[i].ifmb_word)
  403                         return (ifmedia_baudrate_descriptions[i].ifmb_baudrate);
  404         }
  405 
  406         /* Not known. */
  407         return (0);
  408 }
  409  
  410 #ifdef IFMEDIA_DEBUG
  411 struct ifmedia_description ifm_type_descriptions[] =
  412     IFM_TYPE_DESCRIPTIONS;
  413 
  414 struct ifmedia_description ifm_subtype_ethernet_descriptions[] =
  415     IFM_SUBTYPE_ETHERNET_DESCRIPTIONS;
  416 
  417 struct ifmedia_description ifm_subtype_ethernet_option_descriptions[] =
  418     IFM_SUBTYPE_ETHERNET_OPTION_DESCRIPTIONS;
  419 
  420 struct ifmedia_description ifm_subtype_tokenring_descriptions[] =
  421     IFM_SUBTYPE_TOKENRING_DESCRIPTIONS;
  422 
  423 struct ifmedia_description ifm_subtype_tokenring_option_descriptions[] =
  424     IFM_SUBTYPE_TOKENRING_OPTION_DESCRIPTIONS;
  425 
  426 struct ifmedia_description ifm_subtype_fddi_descriptions[] =
  427     IFM_SUBTYPE_FDDI_DESCRIPTIONS;
  428 
  429 struct ifmedia_description ifm_subtype_fddi_option_descriptions[] =
  430     IFM_SUBTYPE_FDDI_OPTION_DESCRIPTIONS;
  431 
  432 struct ifmedia_description ifm_subtype_ieee80211_descriptions[] =
  433     IFM_SUBTYPE_IEEE80211_DESCRIPTIONS;
  434 
  435 struct ifmedia_description ifm_subtype_ieee80211_option_descriptions[] =
  436     IFM_SUBTYPE_IEEE80211_OPTION_DESCRIPTIONS;
  437 
  438 struct ifmedia_description ifm_subtype_ieee80211_mode_descriptions[] =
  439     IFM_SUBTYPE_IEEE80211_MODE_DESCRIPTIONS;
  440 
  441 struct ifmedia_description ifm_subtype_atm_descriptions[] =
  442     IFM_SUBTYPE_ATM_DESCRIPTIONS;
  443 
  444 struct ifmedia_description ifm_subtype_atm_option_descriptions[] =
  445     IFM_SUBTYPE_ATM_OPTION_DESCRIPTIONS;
  446 
  447 struct ifmedia_description ifm_subtype_shared_descriptions[] =
  448     IFM_SUBTYPE_SHARED_DESCRIPTIONS;
  449 
  450 struct ifmedia_description ifm_shared_option_descriptions[] =
  451     IFM_SHARED_OPTION_DESCRIPTIONS;
  452 
  453 struct ifmedia_type_to_subtype {
  454         struct ifmedia_description *subtypes;
  455         struct ifmedia_description *options;
  456         struct ifmedia_description *modes;
  457 };
  458 
  459 /* must be in the same order as IFM_TYPE_DESCRIPTIONS */
  460 struct ifmedia_type_to_subtype ifmedia_types_to_subtypes[] = {
  461         {
  462           &ifm_subtype_ethernet_descriptions[0],
  463           &ifm_subtype_ethernet_option_descriptions[0],
  464           NULL,
  465         },
  466         {
  467           &ifm_subtype_tokenring_descriptions[0],
  468           &ifm_subtype_tokenring_option_descriptions[0],
  469           NULL,
  470         },
  471         {
  472           &ifm_subtype_fddi_descriptions[0],
  473           &ifm_subtype_fddi_option_descriptions[0],
  474           NULL,
  475         },
  476         {
  477           &ifm_subtype_ieee80211_descriptions[0],
  478           &ifm_subtype_ieee80211_option_descriptions[0],
  479           &ifm_subtype_ieee80211_mode_descriptions[0]
  480         },
  481         {
  482           &ifm_subtype_atm_descriptions[0],
  483           &ifm_subtype_atm_option_descriptions[0],
  484           NULL,
  485         },
  486 };
  487 
  488 /*
  489  * print a media word.
  490  */
  491 static void
  492 ifmedia_printword(ifmw)
  493         int ifmw;
  494 {
  495         struct ifmedia_description *desc;
  496         struct ifmedia_type_to_subtype *ttos;
  497         int seen_option = 0;
  498 
  499         /* Find the top-level interface type. */
  500         for (desc = ifm_type_descriptions, ttos = ifmedia_types_to_subtypes;
  501             desc->ifmt_string != NULL; desc++, ttos++)
  502                 if (IFM_TYPE(ifmw) == desc->ifmt_word)
  503                         break;
  504         if (desc->ifmt_string == NULL) {
  505                 printf("<unknown type>\n");
  506                 return;
  507         }
  508         printf(desc->ifmt_string);
  509 
  510         /* Any mode. */
  511         for (desc = ttos->modes; desc && desc->ifmt_string != NULL; desc++)
  512                 if (IFM_MODE(ifmw) == desc->ifmt_word) {
  513                         if (desc->ifmt_string != NULL)
  514                                 printf(" mode %s", desc->ifmt_string);
  515                         break;
  516                 }
  517 
  518         /*
  519          * Check for the shared subtype descriptions first, then the
  520          * type-specific ones.
  521          */
  522         for (desc = ifm_subtype_shared_descriptions;
  523             desc->ifmt_string != NULL; desc++)
  524                 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
  525                         goto got_subtype;
  526 
  527         for (desc = ttos->subtypes; desc->ifmt_string != NULL; desc++)
  528                 if (IFM_SUBTYPE(ifmw) == desc->ifmt_word)
  529                         break;
  530         if (desc->ifmt_string == NULL) {
  531                 printf(" <unknown subtype>\n");
  532                 return;
  533         }
  534 
  535  got_subtype:
  536         printf(" %s", desc->ifmt_string);
  537 
  538         /*
  539          * Look for shared options.
  540          */
  541         for (desc = ifm_shared_option_descriptions;
  542             desc->ifmt_string != NULL; desc++) {
  543                 if (ifmw & desc->ifmt_word) {
  544                         if (seen_option == 0)
  545                                 printf(" <");
  546                         printf("%s%s", seen_option++ ? "," : "",
  547                             desc->ifmt_string);
  548                 }
  549         }
  550 
  551         /*
  552          * Look for subtype-specific options.
  553          */
  554         for (desc = ttos->options; desc->ifmt_string != NULL; desc++) {
  555                 if (ifmw & desc->ifmt_word) {
  556                         if (seen_option == 0)
  557                                 printf(" <");
  558                         printf("%s%s", seen_option++ ? "," : "",
  559                             desc->ifmt_string); 
  560                 }
  561         }
  562         printf("%s\n", seen_option ? ">" : "");
  563 }
  564 #endif /* IFMEDIA_DEBUG */

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