sys/net80211/ieee80211_input.h

   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_ */