ieee80211_regdomain.c

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    1 /*      $OpenBSD: ieee80211_regdomain.c,v 1.10 2015/11/24 13:45:06 mpi Exp $    */
    2 
    3 /*
    4  * Copyright (c) 2004, 2005 Reyk Floeter <reyk@openbsd.org>
    5  *
    6  * Permission to use, copy, modify, and distribute this software for any
    7  * purpose with or without fee is hereby granted, provided that the above
    8  * copyright notice and this permission notice appear in all copies.
    9  *
   10  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   11  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   12  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   13  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   14  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   15  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   16  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   17  */
   18 
   19 /*
   20  * Basic regulation domain extensions for the IEEE 802.11 stack
   21  */
   22 
   23 #include <sys/param.h>
   24 #include <sys/systm.h>
   25 #include <sys/mbuf.h>
   26 #include <sys/kernel.h>
   27 #include <sys/socket.h>
   28 #include <sys/sockio.h>
   29 #include <sys/endian.h>
   30 #include <sys/errno.h>
   31 
   32 #include <net/if.h>
   33 #include <net/if_dl.h>
   34 #include <net/if_media.h>
   35 #include <net/if_llc.h>
   36 
   37 #include <netinet/in.h>
   38 #include <netinet/if_ether.h>
   39 
   40 #include <net80211/ieee80211_var.h>
   41 #include <net80211/ieee80211_regdomain.h>
   42 
   43 int      ieee80211_regdomain_compare_cn(const void *, const void *);
   44 int      ieee80211_regdomain_compare_rn(const void *, const void *);
   45 
   46 static const struct ieee80211_regdomainname
   47 ieee80211_r_names[] = IEEE80211_REGDOMAIN_NAMES;
   48 
   49 static const struct ieee80211_regdomainmap
   50 ieee80211_r_map[] = IEEE80211_REGDOMAIN_MAP;
   51 
   52 static const struct ieee80211_countryname
   53 ieee80211_r_ctry[] = IEEE80211_REGDOMAIN_COUNTRY_NAMES;
   54 
   55 #ifndef bsearch
   56 const void *bsearch(const void *, const void *, size_t, size_t,
   57     int (*)(const void *, const void *));
   58 
   59 const void *
   60 bsearch(const void *key, const void *base0, size_t nmemb, size_t size,
   61     int (*compar)(const void *, const void *))
   62 {
   63         const char *base = base0;
   64         int lim, cmp;
   65         const void *p;
   66 
   67         for (lim = nmemb; lim != 0; lim >>= 1) {
   68                 p = base + (lim >> 1) * size;
   69                 cmp = (*compar)(key, p);
   70                 if (cmp == 0)
   71                         return ((const void *)p);
   72                 if (cmp > 0) {  /* key > p: move right */
   73                         base = (const char *)p + size;
   74                         lim--;
   75                 } /* else move left */
   76         }
   77         return (NULL);
   78 }
   79 #endif
   80 
   81 int
   82 ieee80211_regdomain_compare_cn(const void *a, const void *b)
   83 {
   84         return (strcmp(((const struct ieee80211_countryname*)a)->cn_name,
   85             ((const struct ieee80211_countryname*)b)->cn_name));
   86 }
   87 
   88 int
   89 ieee80211_regdomain_compare_rn(const void *a, const void *b)
   90 {
   91         return (strcmp(((const struct ieee80211_regdomainname*)a)->rn_name,
   92             ((const struct ieee80211_regdomainname*)b)->rn_name));
   93 }
   94 
   95 u_int16_t
   96 ieee80211_name2countrycode(const char *name)
   97 {
   98         const struct ieee80211_countryname key = { CTRY_DEFAULT, name }, *value;
   99 
  100         if ((value = bsearch(&key, &ieee80211_r_ctry,
  101             nitems(ieee80211_r_ctry), sizeof(struct ieee80211_countryname),
  102             ieee80211_regdomain_compare_cn)) != NULL)
  103                 return (value->cn_code);
  104 
  105         return (CTRY_DEFAULT);
  106 }
  107 
  108 u_int32_t
  109 ieee80211_name2regdomain(const char *name)
  110 {
  111         const struct ieee80211_regdomainname *value;
  112         struct ieee80211_regdomainname key;
  113 
  114         key.rn_domain = DMN_DEFAULT;
  115         key.rn_name = name;
  116 
  117         if ((value = bsearch(&key, &ieee80211_r_names,
  118             nitems(ieee80211_r_names), sizeof(struct ieee80211_regdomainname),
  119             ieee80211_regdomain_compare_rn)) != NULL)
  120                 return ((u_int32_t)value->rn_domain);
  121 
  122         return ((u_int32_t)DMN_DEFAULT);
  123 }
  124 
  125 const char *
  126 ieee80211_countrycode2name(u_int16_t code)
  127 {
  128         int i;
  129 
  130         /* Linear search over the table */
  131         for (i = 0; i < (sizeof(ieee80211_r_ctry) /
  132             sizeof(ieee80211_r_ctry[0])); i++)
  133                 if (ieee80211_r_ctry[i].cn_code == code)
  134                         return (ieee80211_r_ctry[i].cn_name);
  135 
  136         return (NULL);
  137 }
  138 
  139 const char *
  140 ieee80211_regdomain2name(u_int32_t regdomain)
  141 {
  142         int i;
  143 
  144         /* Linear search over the table */
  145         for (i = 0; i < (sizeof(ieee80211_r_names) /
  146                 sizeof(ieee80211_r_names[0])); i++)
  147                 if (ieee80211_r_names[i].rn_domain == regdomain)
  148                         return (ieee80211_r_names[i].rn_name);
  149 
  150         return (ieee80211_r_names[0].rn_name);
  151 }
  152 
  153 u_int32_t
  154 ieee80211_regdomain2flag(u_int16_t regdomain, u_int16_t mhz)
  155 {
  156         int i;
  157 
  158         for (i = 0; i < (sizeof(ieee80211_r_map) /
  159                 sizeof(ieee80211_r_map[0])); i++) {
  160                 if (ieee80211_r_map[i].rm_domain == regdomain) {
  161                         if (mhz >= 2000 && mhz <= 3000)
  162                                 return ((u_int32_t)
  163                                     ieee80211_r_map[i].rm_domain_2ghz);
  164                         if (mhz >= IEEE80211_CHANNELS_5GHZ_MIN &&
  165                             mhz <= IEEE80211_CHANNELS_5GHZ_MAX)
  166                                 return ((u_int32_t)
  167                                     ieee80211_r_map[i].rm_domain_5ghz);
  168                 }
  169         }
  170 
  171         return ((u_int32_t)DMN_DEBUG);
  172 }
  173 
  174 u_int32_t
  175 ieee80211_countrycode2regdomain(u_int16_t code)
  176 {
  177         int i;
  178 
  179         for (i = 0; i < nitems(ieee80211_r_ctry); i++)
  180                 if (ieee80211_r_ctry[i].cn_code == code)
  181                         return (ieee80211_r_ctry[i].cn_domain);
  182 
  183         return ((u_int32_t)DMN_DEFAULT);
  184 }

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FreeBSD/Linux Kernel Cross Reference sys/net80211/ieee80211_regdomain.c

FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_regdomain.c