The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_scan.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 2002-2008 Sam Leffler, Errno Consulting
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   15  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   16  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   17  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   18  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   19  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   20  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   21  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   23  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   24  */
   25 
   26 #include <sys/cdefs.h>
   27 __FBSDID("$FreeBSD: releng/11.0/sys/net80211/ieee80211_scan.c 298392 2016-04-21 06:19:33Z avos $");
   28 
   29 /*
   30  * IEEE 802.11 scanning support.
   31  */
   32 #include "opt_wlan.h"
   33 
   34 #include <sys/param.h>
   35 #include <sys/systm.h> 
   36 #include <sys/proc.h>
   37 #include <sys/kernel.h>
   38 #include <sys/malloc.h>
   39 #include <sys/condvar.h>
   40  
   41 #include <sys/socket.h>
   42 
   43 #include <net/if.h>
   44 #include <net/if_var.h>
   45 #include <net/if_media.h>
   46 #include <net/ethernet.h>
   47 
   48 #include <net80211/ieee80211_var.h>
   49 
   50 /* XXX until it's implemented as attach ops */
   51 #include <net80211/ieee80211_scan_sw.h>
   52 
   53 #include <net/bpf.h>
   54 
   55 /*
   56  * Roaming-related defaults.  RSSI thresholds are as returned by the
   57  * driver (.5dBm).  Transmit rate thresholds are IEEE rate codes (i.e
   58  * .5M units) or MCS.
   59  */
   60 /* rssi thresholds */
   61 #define ROAM_RSSI_11A_DEFAULT           14      /* 11a bss */
   62 #define ROAM_RSSI_11B_DEFAULT           14      /* 11b bss */
   63 #define ROAM_RSSI_11BONLY_DEFAULT       14      /* 11b-only bss */
   64 /* transmit rate thresholds */
   65 #define ROAM_RATE_11A_DEFAULT           2*12    /* 11a bss */
   66 #define ROAM_RATE_11B_DEFAULT           2*5     /* 11b bss */
   67 #define ROAM_RATE_11BONLY_DEFAULT       2*1     /* 11b-only bss */
   68 #define ROAM_RATE_HALF_DEFAULT          2*6     /* half-width 11a/g bss */
   69 #define ROAM_RATE_QUARTER_DEFAULT       2*3     /* quarter-width 11a/g bss */
   70 #define ROAM_MCS_11N_DEFAULT            (1 | IEEE80211_RATE_MCS) /* 11n bss */
   71 
   72 void
   73 ieee80211_scan_attach(struct ieee80211com *ic)
   74 {
   75         /*
   76          * If there's no scan method pointer, attach the
   77          * swscan set as a default.
   78          */
   79         if (ic->ic_scan_methods == NULL)
   80                 ieee80211_swscan_attach(ic);
   81         else
   82                 ic->ic_scan_methods->sc_attach(ic);
   83 }
   84 
   85 void
   86 ieee80211_scan_detach(struct ieee80211com *ic)
   87 {
   88 
   89         /*
   90          * Ideally we'd do the ss_ops detach call here;
   91          * but then sc_detach() would need to be split in two.
   92          *
   93          * I'll do that later.
   94          */
   95         ic->ic_scan_methods->sc_detach(ic);
   96 }
   97 
   98 static const struct ieee80211_roamparam defroam[IEEE80211_MODE_MAX] = {
   99         [IEEE80211_MODE_11A]    = { .rssi = ROAM_RSSI_11A_DEFAULT,
  100                                     .rate = ROAM_RATE_11A_DEFAULT },
  101         [IEEE80211_MODE_11G]    = { .rssi = ROAM_RSSI_11B_DEFAULT,
  102                                     .rate = ROAM_RATE_11B_DEFAULT },
  103         [IEEE80211_MODE_11B]    = { .rssi = ROAM_RSSI_11BONLY_DEFAULT,
  104                                     .rate = ROAM_RATE_11BONLY_DEFAULT },
  105         [IEEE80211_MODE_TURBO_A]= { .rssi = ROAM_RSSI_11A_DEFAULT,
  106                                     .rate = ROAM_RATE_11A_DEFAULT },
  107         [IEEE80211_MODE_TURBO_G]= { .rssi = ROAM_RSSI_11A_DEFAULT,
  108                                     .rate = ROAM_RATE_11A_DEFAULT },
  109         [IEEE80211_MODE_STURBO_A]={ .rssi = ROAM_RSSI_11A_DEFAULT,
  110                                     .rate = ROAM_RATE_11A_DEFAULT },
  111         [IEEE80211_MODE_HALF]   = { .rssi = ROAM_RSSI_11A_DEFAULT,
  112                                     .rate = ROAM_RATE_HALF_DEFAULT },
  113         [IEEE80211_MODE_QUARTER]= { .rssi = ROAM_RSSI_11A_DEFAULT,
  114                                     .rate = ROAM_RATE_QUARTER_DEFAULT },
  115         [IEEE80211_MODE_11NA]   = { .rssi = ROAM_RSSI_11A_DEFAULT,
  116                                     .rate = ROAM_MCS_11N_DEFAULT },
  117         [IEEE80211_MODE_11NG]   = { .rssi = ROAM_RSSI_11B_DEFAULT,
  118                                     .rate = ROAM_MCS_11N_DEFAULT },
  119 };
  120 
  121 void
  122 ieee80211_scan_vattach(struct ieee80211vap *vap)
  123 {
  124         struct ieee80211com *ic = vap->iv_ic;
  125 
  126         vap->iv_bgscanidle = (IEEE80211_BGSCAN_IDLE_DEFAULT*1000)/hz;
  127         vap->iv_bgscanintvl = IEEE80211_BGSCAN_INTVAL_DEFAULT*hz;
  128         vap->iv_scanvalid = IEEE80211_SCAN_VALID_DEFAULT*hz;
  129 
  130         vap->iv_roaming = IEEE80211_ROAMING_AUTO;
  131         memcpy(vap->iv_roamparms, defroam, sizeof(defroam));
  132 
  133         ic->ic_scan_methods->sc_vattach(vap);
  134 }
  135 
  136 void
  137 ieee80211_scan_vdetach(struct ieee80211vap *vap)
  138 {
  139         struct ieee80211com *ic = vap->iv_ic;
  140         struct ieee80211_scan_state *ss;
  141 
  142         IEEE80211_LOCK(ic);
  143         ss = ic->ic_scan;
  144 
  145         ic->ic_scan_methods->sc_vdetach(vap);
  146 
  147         if (ss != NULL && ss->ss_vap == vap) {
  148                 if (ss->ss_ops != NULL) {
  149                         ss->ss_ops->scan_detach(ss);
  150                         ss->ss_ops = NULL;
  151                 }
  152                 ss->ss_vap = NULL;
  153         }
  154         IEEE80211_UNLOCK(ic);
  155 }
  156 
  157 /*
  158  * Simple-minded scanner module support.
  159  */
  160 static const char *scan_modnames[IEEE80211_OPMODE_MAX] = {
  161         "wlan_scan_sta",        /* IEEE80211_M_IBSS */
  162         "wlan_scan_sta",        /* IEEE80211_M_STA */
  163         "wlan_scan_wds",        /* IEEE80211_M_WDS */
  164         "wlan_scan_sta",        /* IEEE80211_M_AHDEMO */
  165         "wlan_scan_ap",         /* IEEE80211_M_HOSTAP */
  166         "wlan_scan_monitor",    /* IEEE80211_M_MONITOR */
  167         "wlan_scan_sta",        /* IEEE80211_M_MBSS */
  168 };
  169 static const struct ieee80211_scanner *scanners[IEEE80211_OPMODE_MAX];
  170 
  171 const struct ieee80211_scanner *
  172 ieee80211_scanner_get(enum ieee80211_opmode mode)
  173 {
  174         if (mode >= IEEE80211_OPMODE_MAX)
  175                 return NULL;
  176         if (scanners[mode] == NULL)
  177                 ieee80211_load_module(scan_modnames[mode]);
  178         return scanners[mode];
  179 }
  180 
  181 void
  182 ieee80211_scanner_register(enum ieee80211_opmode mode,
  183         const struct ieee80211_scanner *scan)
  184 {
  185         if (mode >= IEEE80211_OPMODE_MAX)
  186                 return;
  187         scanners[mode] = scan;
  188 }
  189 
  190 void
  191 ieee80211_scanner_unregister(enum ieee80211_opmode mode,
  192         const struct ieee80211_scanner *scan)
  193 {
  194         if (mode >= IEEE80211_OPMODE_MAX)
  195                 return;
  196         if (scanners[mode] == scan)
  197                 scanners[mode] = NULL;
  198 }
  199 
  200 void
  201 ieee80211_scanner_unregister_all(const struct ieee80211_scanner *scan)
  202 {
  203         int m;
  204 
  205         for (m = 0; m < IEEE80211_OPMODE_MAX; m++)
  206                 if (scanners[m] == scan)
  207                         scanners[m] = NULL;
  208 }
  209 
  210 /*
  211  * Update common scanner state to reflect the current
  212  * operating mode.  This is called when the state machine
  213  * is transitioned to RUN state w/o scanning--e.g. when
  214  * operating in monitor mode.  The purpose of this is to
  215  * ensure later callbacks find ss_ops set to properly
  216  * reflect current operating mode.
  217  */
  218 void
  219 ieee80211_scan_update_locked(struct ieee80211vap *vap,
  220         const struct ieee80211_scanner *scan)
  221 {
  222         struct ieee80211com *ic = vap->iv_ic;
  223         struct ieee80211_scan_state *ss = ic->ic_scan;
  224 
  225         IEEE80211_LOCK_ASSERT(ic);
  226 
  227 #ifdef IEEE80211_DEBUG
  228         if (ss->ss_vap != vap || ss->ss_ops != scan) {
  229                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  230                     "%s: current scanner is <%s:%s>, switch to <%s:%s>\n",
  231                     __func__,
  232                     ss->ss_vap != NULL ?
  233                         ss->ss_vap->iv_ifp->if_xname : "none",
  234                     ss->ss_vap != NULL ?
  235                         ieee80211_opmode_name[ss->ss_vap->iv_opmode] : "none",
  236                     vap->iv_ifp->if_xname,
  237                     ieee80211_opmode_name[vap->iv_opmode]);
  238         }
  239 #endif
  240         ss->ss_vap = vap;
  241         if (ss->ss_ops != scan) {
  242                 /*
  243                  * Switch scanners; detach old, attach new.  Special
  244                  * case where a single scan module implements multiple
  245                  * policies by using different scan ops but a common
  246                  * core.  We assume if the old and new attach methods
  247                  * are identical then it's ok to just change ss_ops
  248                  * and not flush the internal state of the module.
  249                  */
  250                 if (scan == NULL || ss->ss_ops == NULL ||
  251                     ss->ss_ops->scan_attach != scan->scan_attach) {
  252                         if (ss->ss_ops != NULL)
  253                                 ss->ss_ops->scan_detach(ss);
  254                         if (scan != NULL && !scan->scan_attach(ss)) {
  255                                 /* XXX attach failure */
  256                                 /* XXX stat+msg */
  257                                 scan = NULL;
  258                         }
  259                 }
  260                 ss->ss_ops = scan;
  261         }
  262 }
  263 
  264 void
  265 ieee80211_scan_dump_channels(const struct ieee80211_scan_state *ss)
  266 {
  267         struct ieee80211com *ic = ss->ss_ic;
  268         const char *sep;
  269         int i;
  270 
  271         sep = "";
  272         for (i = ss->ss_next; i < ss->ss_last; i++) {
  273                 const struct ieee80211_channel *c = ss->ss_chans[i];
  274 
  275                 printf("%s%u%c", sep, ieee80211_chan2ieee(ic, c),
  276                     ieee80211_channel_type_char(c));
  277                 sep = ", ";
  278         }
  279 }
  280 
  281 #ifdef IEEE80211_DEBUG
  282 void
  283 ieee80211_scan_dump(struct ieee80211_scan_state *ss)
  284 {
  285         struct ieee80211vap *vap = ss->ss_vap;
  286 
  287         if_printf(vap->iv_ifp, "scan set ");
  288         ieee80211_scan_dump_channels(ss);
  289         printf(" dwell min %lums max %lums\n",
  290             ticks_to_msecs(ss->ss_mindwell), ticks_to_msecs(ss->ss_maxdwell));
  291 }
  292 #endif /* IEEE80211_DEBUG */
  293 
  294 void
  295 ieee80211_scan_copy_ssid(struct ieee80211vap *vap, struct ieee80211_scan_state *ss,
  296         int nssid, const struct ieee80211_scan_ssid ssids[])
  297 {
  298         if (nssid > IEEE80211_SCAN_MAX_SSID) {
  299                 /* XXX printf */
  300                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  301                     "%s: too many ssid %d, ignoring all of them\n",
  302                     __func__, nssid);
  303                 return;
  304         }
  305         memcpy(ss->ss_ssid, ssids, nssid * sizeof(ssids[0]));
  306         ss->ss_nssid = nssid;
  307 }
  308 
  309 /*
  310  * Start a scan unless one is already going.
  311  */
  312 int
  313 ieee80211_start_scan(struct ieee80211vap *vap, int flags,
  314         u_int duration, u_int mindwell, u_int maxdwell,
  315         u_int nssid, const struct ieee80211_scan_ssid ssids[])
  316 {
  317         const struct ieee80211_scanner *scan;
  318         struct ieee80211com *ic = vap->iv_ic;
  319 
  320         scan = ieee80211_scanner_get(vap->iv_opmode);
  321         if (scan == NULL) {
  322                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  323                     "%s: no scanner support for %s mode\n",
  324                     __func__, ieee80211_opmode_name[vap->iv_opmode]);
  325                 /* XXX stat */
  326                 return 0;
  327         }
  328 
  329         return ic->ic_scan_methods->sc_start_scan(scan, vap, flags, duration,
  330             mindwell, maxdwell, nssid, ssids);
  331 }
  332 
  333 /*
  334  * Check the scan cache for an ap/channel to use; if that
  335  * fails then kick off a new scan.
  336  */
  337 int
  338 ieee80211_check_scan(struct ieee80211vap *vap, int flags,
  339         u_int duration, u_int mindwell, u_int maxdwell,
  340         u_int nssid, const struct ieee80211_scan_ssid ssids[])
  341 {
  342         struct ieee80211com *ic = vap->iv_ic;
  343         struct ieee80211_scan_state *ss = ic->ic_scan;
  344         const struct ieee80211_scanner *scan;
  345         int result;
  346 
  347         scan = ieee80211_scanner_get(vap->iv_opmode);
  348         if (scan == NULL) {
  349                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  350                     "%s: no scanner support for %s mode\n",
  351                     __func__, vap->iv_opmode);
  352                 /* XXX stat */
  353                 return 0;
  354         }
  355 
  356         /*
  357          * Check if there's a list of scan candidates already.
  358          * XXX want more than the ap we're currently associated with
  359          */
  360 
  361         IEEE80211_LOCK(ic);
  362         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  363             "%s: %s scan, %s%s%s%s%s\n"
  364             , __func__
  365             , flags & IEEE80211_SCAN_ACTIVE ? "active" : "passive"
  366             , flags & IEEE80211_SCAN_FLUSH ? "flush" : "append"
  367             , flags & IEEE80211_SCAN_NOPICK ? ", nopick" : ""
  368             , flags & IEEE80211_SCAN_NOJOIN ? ", nojoin" : ""
  369             , flags & IEEE80211_SCAN_PICK1ST ? ", pick1st" : ""
  370             , flags & IEEE80211_SCAN_ONCE ? ", once" : ""
  371         );
  372 
  373         if (ss->ss_ops != scan) {
  374                 /* XXX re-use cache contents? e.g. adhoc<->sta */
  375                 flags |= IEEE80211_SCAN_FLUSH;
  376         }
  377 
  378         /*
  379          * XXX TODO: separate things out a bit better.
  380          */
  381         ieee80211_scan_update_locked(vap, scan);
  382 
  383         result = ic->ic_scan_methods->sc_check_scan(scan, vap, flags, duration,
  384             mindwell, maxdwell, nssid, ssids);
  385 
  386         IEEE80211_UNLOCK(ic);
  387 
  388         return (result);
  389 }
  390 
  391 /*
  392  * Check the scan cache for an ap/channel to use; if that fails
  393  * then kick off a scan using the current settings.
  394  */
  395 int
  396 ieee80211_check_scan_current(struct ieee80211vap *vap)
  397 {
  398         return ieee80211_check_scan(vap,
  399             IEEE80211_SCAN_ACTIVE,
  400             IEEE80211_SCAN_FOREVER, 0, 0,
  401             vap->iv_des_nssid, vap->iv_des_ssid);
  402 }
  403 
  404 /*
  405  * Restart a previous scan.  If the previous scan completed
  406  * then we start again using the existing channel list.
  407  */
  408 int
  409 ieee80211_bg_scan(struct ieee80211vap *vap, int flags)
  410 {
  411         struct ieee80211com *ic = vap->iv_ic;
  412         const struct ieee80211_scanner *scan;
  413 
  414         // IEEE80211_UNLOCK_ASSERT(sc);
  415 
  416         scan = ieee80211_scanner_get(vap->iv_opmode);
  417         if (scan == NULL) {
  418                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN,
  419                     "%s: no scanner support for %s mode\n",
  420                     __func__, vap->iv_opmode);
  421                 /* XXX stat */
  422                 return 0;
  423         }
  424 
  425         /*
  426          * XXX TODO: pull apart the bgscan logic into whatever
  427          * belongs here and whatever belongs in the software
  428          * scanner.
  429          */
  430         return (ic->ic_scan_methods->sc_bg_scan(scan, vap, flags));
  431 }
  432 
  433 /*
  434  * Cancel any scan currently going on for the specified vap.
  435  */
  436 void
  437 ieee80211_cancel_scan(struct ieee80211vap *vap)
  438 {
  439         struct ieee80211com *ic = vap->iv_ic;
  440 
  441         ic->ic_scan_methods->sc_cancel_scan(vap);
  442 }
  443 
  444 /*
  445  * Cancel any scan currently going on.
  446  */
  447 void
  448 ieee80211_cancel_anyscan(struct ieee80211vap *vap)
  449 {
  450         struct ieee80211com *ic = vap->iv_ic;
  451 
  452         ic->ic_scan_methods->sc_cancel_anyscan(vap);
  453 }
  454 
  455 /*
  456  * Manually switch to the next channel in the channel list.
  457  * Provided for drivers that manage scanning themselves
  458  * (e.g. for firmware-based devices).
  459  */
  460 void
  461 ieee80211_scan_next(struct ieee80211vap *vap)
  462 {
  463         struct ieee80211com *ic = vap->iv_ic;
  464 
  465         ic->ic_scan_methods->sc_scan_next(vap);
  466 }
  467 
  468 /*
  469  * Manually stop a scan that is currently running.
  470  * Provided for drivers that are not able to scan single channels
  471  * (e.g. for firmware-based devices).
  472  */
  473 void
  474 ieee80211_scan_done(struct ieee80211vap *vap)
  475 {
  476         struct ieee80211com *ic = vap->iv_ic;
  477         struct ieee80211_scan_state *ss;
  478 
  479         IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s: called\n", __func__);
  480 
  481         IEEE80211_LOCK(ic);
  482         ss = ic->ic_scan;
  483         ss->ss_next = ss->ss_last; /* all channels are complete */
  484 
  485         ic->ic_scan_methods->sc_scan_done(vap);
  486 
  487         IEEE80211_UNLOCK(ic);
  488 }
  489 
  490 /*
  491  * Probe the current channel, if allowed, while scanning.
  492  * If the channel is not marked passive-only then send
  493  * a probe request immediately.  Otherwise mark state and
  494  * listen for beacons on the channel; if we receive something
  495  * then we'll transmit a probe request.
  496  */
  497 void
  498 ieee80211_probe_curchan(struct ieee80211vap *vap, int force)
  499 {
  500         struct ieee80211com *ic = vap->iv_ic;
  501 
  502         if ((ic->ic_curchan->ic_flags & IEEE80211_CHAN_PASSIVE) && !force) {
  503                 ic->ic_flags_ext |= IEEE80211_FEXT_PROBECHAN;
  504                 return;
  505         }
  506 
  507         ic->ic_scan_methods->sc_scan_probe_curchan(vap, force);
  508 }
  509 
  510 #ifdef IEEE80211_DEBUG
  511 static void
  512 dump_country(const uint8_t *ie)
  513 {
  514         const struct ieee80211_country_ie *cie =
  515            (const struct ieee80211_country_ie *) ie;
  516         int i, nbands, schan, nchan;
  517 
  518         if (cie->len < 3) {
  519                 printf(" <bogus country ie, len %d>", cie->len);
  520                 return;
  521         }
  522         printf(" country [%c%c%c", cie->cc[0], cie->cc[1], cie->cc[2]);
  523         nbands = (cie->len - 3) / sizeof(cie->band[0]);
  524         for (i = 0; i < nbands; i++) {
  525                 schan = cie->band[i].schan;
  526                 nchan = cie->band[i].nchan;
  527                 if (nchan != 1)
  528                         printf(" %u-%u,%u", schan, schan + nchan-1,
  529                             cie->band[i].maxtxpwr);
  530                 else
  531                         printf(" %u,%u", schan, cie->band[i].maxtxpwr);
  532         }
  533         printf("]");
  534 }
  535 
  536 void
  537 ieee80211_scan_dump_probe_beacon(uint8_t subtype, int isnew,
  538         const uint8_t mac[IEEE80211_ADDR_LEN],
  539         const struct ieee80211_scanparams *sp, int rssi)
  540 {
  541 
  542         printf("[%s] %s%s on chan %u (bss chan %u) ",
  543             ether_sprintf(mac), isnew ? "new " : "",
  544             ieee80211_mgt_subtype_name(subtype), sp->chan, sp->bchan);
  545         ieee80211_print_essid(sp->ssid + 2, sp->ssid[1]);
  546         printf(" rssi %d\n", rssi);
  547 
  548         if (isnew) {
  549                 printf("[%s] caps 0x%x bintval %u erp 0x%x", 
  550                         ether_sprintf(mac), sp->capinfo, sp->bintval, sp->erp);
  551                 if (sp->country != NULL)
  552                         dump_country(sp->country);
  553                 printf("\n");
  554         }
  555 }
  556 #endif /* IEEE80211_DEBUG */
  557 
  558 /*
  559  * Process a beacon or probe response frame.
  560  */
  561 void
  562 ieee80211_add_scan(struct ieee80211vap *vap,
  563         struct ieee80211_channel *curchan,
  564         const struct ieee80211_scanparams *sp,
  565         const struct ieee80211_frame *wh,
  566         int subtype, int rssi, int noise)
  567 {
  568         struct ieee80211com *ic = vap->iv_ic;
  569 
  570         return (ic->ic_scan_methods->sc_add_scan(vap, curchan, sp, wh, subtype,
  571             rssi, noise));
  572 }
  573 
  574 /*
  575  * Timeout/age scan cache entries; called from sta timeout
  576  * timer (XXX should be self-contained).
  577  */
  578 void
  579 ieee80211_scan_timeout(struct ieee80211com *ic)
  580 {
  581         struct ieee80211_scan_state *ss = ic->ic_scan;
  582 
  583         if (ss->ss_ops != NULL)
  584                 ss->ss_ops->scan_age(ss);
  585 }
  586 
  587 /*
  588  * Mark a scan cache entry after a successful associate.
  589  */
  590 void
  591 ieee80211_scan_assoc_success(struct ieee80211vap *vap, const uint8_t mac[])
  592 {
  593         struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
  594 
  595         if (ss->ss_ops != NULL) {
  596                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN,
  597                         mac, "%s",  __func__);
  598                 ss->ss_ops->scan_assoc_success(ss, mac);
  599         }
  600 }
  601 
  602 /*
  603  * Demerit a scan cache entry after failing to associate.
  604  */
  605 void
  606 ieee80211_scan_assoc_fail(struct ieee80211vap *vap,
  607         const uint8_t mac[], int reason)
  608 {
  609         struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
  610 
  611         if (ss->ss_ops != NULL) {
  612                 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_SCAN, mac,
  613                         "%s: reason %u", __func__, reason);
  614                 ss->ss_ops->scan_assoc_fail(ss, mac, reason);
  615         }
  616 }
  617 
  618 /*
  619  * Iterate over the contents of the scan cache.
  620  */
  621 void
  622 ieee80211_scan_iterate(struct ieee80211vap *vap,
  623         ieee80211_scan_iter_func *f, void *arg)
  624 {
  625         struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
  626 
  627         if (ss->ss_ops != NULL)
  628                 ss->ss_ops->scan_iterate(ss, f, arg);
  629 }
  630 
  631 /*
  632  * Flush the contents of the scan cache.
  633  */
  634 void
  635 ieee80211_scan_flush(struct ieee80211vap *vap)
  636 {
  637         struct ieee80211_scan_state *ss = vap->iv_ic->ic_scan;
  638 
  639         if (ss->ss_ops != NULL && ss->ss_vap == vap) {
  640                 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SCAN, "%s\n",  __func__);
  641                 ss->ss_ops->scan_flush(ss);
  642         }
  643 }
  644 
  645 /*
  646  * Check the scan cache for an ap/channel to use; if that
  647  * fails then kick off a new scan.
  648  */
  649 struct ieee80211_channel *
  650 ieee80211_scan_pickchannel(struct ieee80211com *ic, int flags)
  651 {
  652         struct ieee80211_scan_state *ss = ic->ic_scan;
  653 
  654         IEEE80211_LOCK_ASSERT(ic);
  655 
  656         if (ss == NULL || ss->ss_ops == NULL || ss->ss_vap == NULL) {
  657                 /* XXX printf? */
  658                 return NULL;
  659         }
  660         if (ss->ss_ops->scan_pickchan == NULL) {
  661                 IEEE80211_DPRINTF(ss->ss_vap, IEEE80211_MSG_SCAN,
  662                     "%s: scan module does not support picking a channel, "
  663                     "opmode %s\n", __func__, ss->ss_vap->iv_opmode);
  664                 return NULL;
  665         }
  666         return ss->ss_ops->scan_pickchan(ss, flags);
  667 }

Cache object: 492c616389d90003f47a51bd5892ff0d


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.