ieee80211_input.h revision 178354 
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: head/sys/net80211/ieee80211_input.h 178354 2008-04-20 20:35:46Z sam $
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, _action) do {	\
32	if ((__elem) == NULL) {						\
33		IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,		\
34		    wh, NULL, "%s", "no " #__elem );			\
35		vap->iv_stats.is_rx_elem_missing++;			\
36		_action;						\
37	} else if ((__elem)[1] > (__maxlen)) {				\
38		IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,		\
39		    wh, NULL, "bad " #__elem " len %d", (__elem)[1]);	\
40		vap->iv_stats.is_rx_elem_toobig++;			\
41		_action;						\
42	}								\
43} while (0)
44
45#define	IEEE80211_VERIFY_LENGTH(_len, _minlen, _action) do {		\
46	if ((_len) < (_minlen)) {					\
47		IEEE80211_DISCARD(vap, IEEE80211_MSG_ELEMID,		\
48		    wh, NULL, "ie too short, got %d, expected %d",	\
49		    (_len), (_minlen));					\
50		vap->iv_stats.is_rx_elem_toosmall++;			\
51		_action;						\
52	}								\
53} while (0)
54
55#ifdef IEEE80211_DEBUG
56void	ieee80211_ssid_mismatch(struct ieee80211vap *, const char *tag,
57	uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid);
58
59#define	IEEE80211_VERIFY_SSID(_ni, _ssid, _action) do {			\
60	if ((_ssid)[1] != 0 &&						\
61	    ((_ssid)[1] != (_ni)->ni_esslen ||				\
62	    memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) {	\
63		if (ieee80211_msg_input(vap))				\
64			ieee80211_ssid_mismatch(vap, 			\
65			    ieee80211_mgt_subtype_name[subtype >>	\
66				IEEE80211_FC0_SUBTYPE_SHIFT],		\
67				wh->i_addr2, _ssid);			\
68		vap->iv_stats.is_rx_ssidmismatch++;			\
69		_action;						\
70	}								\
71} while (0)
72#else /* !IEEE80211_DEBUG */
73#define	IEEE80211_VERIFY_SSID(_ni, _ssid, _action) do {			\
74	if ((_ssid)[1] != 0 &&						\
75	    ((_ssid)[1] != (_ni)->ni_esslen ||				\
76	    memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) {	\
77		vap->iv_stats.is_rx_ssidmismatch++;			\
78		_action;						\
79	}								\
80} while (0)
81#endif /* !IEEE80211_DEBUG */
82
83/* unalligned little endian access */
84#define LE_READ_2(p)					\
85	((uint16_t)					\
86	 ((((const uint8_t *)(p))[0]      ) |		\
87	  (((const uint8_t *)(p))[1] <<  8)))
88#define LE_READ_4(p)					\
89	((uint32_t)					\
90	 ((((const uint8_t *)(p))[0]      ) |		\
91	  (((const uint8_t *)(p))[1] <<  8) |		\
92	  (((const uint8_t *)(p))[2] << 16) |		\
93	  (((const uint8_t *)(p))[3] << 24)))
94
95static __inline int
96iswpaoui(const uint8_t *frm)
97{
98	return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
99}
100
101static __inline int
102iswmeoui(const uint8_t *frm)
103{
104	return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
105}
106
107static __inline int
108iswmeparam(const uint8_t *frm)
109{
110	return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
111		frm[6] == WME_PARAM_OUI_SUBTYPE;
112}
113
114static __inline int
115iswmeinfo(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_INFO_OUI_SUBTYPE;
119}
120
121static __inline int
122isatherosoui(const uint8_t *frm)
123{
124	return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
125}
126
127static __inline int
128ishtcapoui(const uint8_t *frm)
129{
130	return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI);
131}
132
133static __inline int
134ishtinfooui(const uint8_t *frm)
135{
136	return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI);
137}
138
139void	ieee80211_deliver_data(struct ieee80211vap *,
140		struct ieee80211_node *, struct mbuf *);
141struct mbuf *ieee80211_defrag(struct ieee80211_node *,
142		struct mbuf *, int);
143struct mbuf *ieee80211_decap(struct ieee80211vap *, struct mbuf *, int);
144struct mbuf *ieee80211_decap1(struct mbuf *, int *);
145struct mbuf *ieee80211_decap_fastframe(struct ieee80211_node *,
146		struct mbuf *);
147int	ieee80211_setup_rates(struct ieee80211_node *ni,
148		const uint8_t *rates, const uint8_t *xrates, int flags);
149void ieee80211_send_error(struct ieee80211_node *,
150		const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg);
151int	ieee80211_alloc_challenge(struct ieee80211_node *);
152void	ieee80211_parse_ath(struct ieee80211_node *, uint8_t *);
153int	ieee80211_parse_beacon(struct ieee80211_node *, struct mbuf *,
154		struct ieee80211_scanparams *);
155int	ieee80211_parse_action(struct ieee80211_node *, struct mbuf *);
156#endif /* _NET80211_IEEE80211_INPUT_H_ */
157