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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