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


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FreeBSD/Linux Kernel Cross Reference
sys/net80211/ieee80211_input.h

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    1 /*-
    2  * Copyright (c) 2007-2008 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  * $FreeBSD$
   26  */
   27 #ifndef _NET80211_IEEE80211_INPUT_H_
   28 #define _NET80211_IEEE80211_INPUT_H_
   29 
   30 /* Verify the existence and length of __elem or get out. */
   31 #define IEEE80211_VERIFY_ELEMENT(__elem, __maxlen) do {                 \
   32         if ((__elem) == NULL) {                                         \
   33                 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID,             \
   34                     wh, ieee80211_mgt_subtype_name[subtype >>           \
   35                         IEEE80211_FC0_SUBTYPE_SHIFT],                   \
   36                     "%s", "no " #__elem );                              \
   37                 ic->ic_stats.is_rx_elem_missing++;                      \
   38                 return;                                                 \
   39         }                                                               \
   40         if ((__elem)[1] > (__maxlen)) {                                 \
   41                 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID,             \
   42                     wh, ieee80211_mgt_subtype_name[subtype >>           \
   43                         IEEE80211_FC0_SUBTYPE_SHIFT],                   \
   44                     "bad " #__elem " len %d", (__elem)[1]);             \
   45                 ic->ic_stats.is_rx_elem_toobig++;                       \
   46                 return;                                                 \
   47         }                                                               \
   48 } while (0)
   49 
   50 #define IEEE80211_VERIFY_LENGTH(_len, _minlen, _action) do {            \
   51         if ((_len) < (_minlen)) {                                       \
   52                 IEEE80211_DISCARD(ic, IEEE80211_MSG_ELEMID,             \
   53                     wh, ieee80211_mgt_subtype_name[subtype >>           \
   54                         IEEE80211_FC0_SUBTYPE_SHIFT],                   \
   55                     "ie too short, got %d, expected %d",                \
   56                     (_len), (_minlen));                                 \
   57                 ic->ic_stats.is_rx_elem_toosmall++;                     \
   58                 _action;                                                \
   59         }                                                               \
   60 } while (0)
   61 
   62 #ifdef IEEE80211_DEBUG
   63 void    ieee80211_ssid_mismatch(struct ieee80211com *, const char *tag,
   64         uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid);
   65 
   66 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do {                          \
   67         if ((_ssid)[1] != 0 &&                                          \
   68             ((_ssid)[1] != (_ni)->ni_esslen ||                          \
   69             memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) {   \
   70                 if (ieee80211_msg_input(ic))                            \
   71                         ieee80211_ssid_mismatch(ic,                     \
   72                             ieee80211_mgt_subtype_name[subtype >>       \
   73                                 IEEE80211_FC0_SUBTYPE_SHIFT],           \
   74                                 wh->i_addr2, _ssid);                    \
   75                 ic->ic_stats.is_rx_ssidmismatch++;                      \
   76                 return;                                                 \
   77         }                                                               \
   78 } while (0)
   79 #else /* !IEEE80211_DEBUG */
   80 #define IEEE80211_VERIFY_SSID(_ni, _ssid) do {                          \
   81         if ((_ssid)[1] != 0 &&                                          \
   82             ((_ssid)[1] != (_ni)->ni_esslen ||                          \
   83             memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) {   \
   84                 ic->ic_stats.is_rx_ssidmismatch++;                      \
   85                 return;                                                 \
   86         }                                                               \
   87 } while (0)
   88 #endif /* !IEEE80211_DEBUG */
   89 
   90 /* unalligned little endian access */     
   91 #define LE_READ_2(p)                                    \
   92         ((uint16_t)                                     \
   93          ((((const uint8_t *)(p))[0]      ) |           \
   94           (((const uint8_t *)(p))[1] <<  8)))
   95 #define LE_READ_4(p)                                    \
   96         ((uint32_t)                                     \
   97          ((((const uint8_t *)(p))[0]      ) |           \
   98           (((const uint8_t *)(p))[1] <<  8) |           \
   99           (((const uint8_t *)(p))[2] << 16) |           \
  100           (((const uint8_t *)(p))[3] << 24)))
  101 
  102 static __inline int
  103 iswpaoui(const uint8_t *frm)
  104 {
  105         return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
  106 }
  107 
  108 static __inline int
  109 iswmeoui(const uint8_t *frm)
  110 {
  111         return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
  112 }
  113 
  114 static __inline int
  115 iswmeparam(const uint8_t *frm)
  116 {
  117         return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
  118                 frm[6] == WME_PARAM_OUI_SUBTYPE;
  119 }
  120 
  121 static __inline int
  122 iswmeinfo(const uint8_t *frm)
  123 {
  124         return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
  125                 frm[6] == WME_INFO_OUI_SUBTYPE;
  126 }
  127 
  128 static __inline int
  129 isatherosoui(const uint8_t *frm)
  130 {
  131         return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
  132 }
  133 
  134 static __inline int
  135 ishtcapoui(const uint8_t *frm)
  136 {
  137         return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI);
  138 }
  139 
  140 static __inline int
  141 ishtinfooui(const uint8_t *frm)
  142 {
  143         return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI);
  144 }
  145 
  146 void    ieee80211_parse_ath(struct ieee80211_node *, uint8_t *);
  147 #endif /* _NET80211_IEEE80211_INPUT_H_ */

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