2 * Copyright (c) 2007-2009 Sam Leffler, Errno Consulting
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
27 #ifndef _NET80211_IEEE80211_INPUT_H_
28 #define _NET80211_IEEE80211_INPUT_H_
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++; \
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++; \
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", \
50 vap->iv_stats.is_rx_elem_toosmall++; \
55 #ifdef IEEE80211_DEBUG
56 void ieee80211_ssid_mismatch(struct ieee80211vap *, const char *tag,
57 uint8_t mac[IEEE80211_ADDR_LEN], uint8_t *ssid);
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++; \
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++; \
81 #endif /* !IEEE80211_DEBUG */
83 /* unalligned little endian access */
84 #define LE_READ_2(p) \
86 ((((const uint8_t *)(p))[0] ) | \
87 (((const uint8_t *)(p))[1] << 8)))
88 #define LE_READ_4(p) \
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)))
96 iswpaoui(const uint8_t *frm)
98 return frm[1] > 3 && LE_READ_4(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
102 iswmeoui(const uint8_t *frm)
104 return frm[1] > 3 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
108 iswmeparam(const uint8_t *frm)
110 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
111 frm[6] == WME_PARAM_OUI_SUBTYPE;
115 iswmeinfo(const uint8_t *frm)
117 return frm[1] > 5 && LE_READ_4(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
118 frm[6] == WME_INFO_OUI_SUBTYPE;
122 isatherosoui(const uint8_t *frm)
124 return frm[1] > 3 && LE_READ_4(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
128 istdmaoui(const uint8_t *frm)
130 return frm[1] > 3 && LE_READ_4(frm+2) == ((TDMA_OUI_TYPE<<24)|TDMA_OUI);
134 ishtcapoui(const uint8_t *frm)
136 return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI);
140 ishtinfooui(const uint8_t *frm)
142 return frm[1] > 3 && LE_READ_4(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI);
145 #include <sys/endian.h> /* For le16toh() */
148 * Check the current frame sequence number against the current TID
149 * state and return whether it's in sequence or should be dropped.
151 * Since out of order packet and duplicate packet eliminations should
152 * be done by the AMPDU RX code, this routine blindly accepts all
153 * frames from a HT station w/ a TID that is currently doing AMPDU-RX.
154 * HT stations without WME or where the TID is not doing AMPDU-RX
155 * are checked like non-HT stations.
157 * The routine only eliminates packets whose sequence/fragment
158 * match or are less than the last seen sequence/fragment number
159 * AND are retransmits It doesn't try to eliminate out of order packets.
161 * Since all frames after sequence number 4095 will be less than 4095
162 * (as the seqnum wraps), handle that special case so packets aren't
163 * incorrectly dropped - ie, if the next packet is sequence number 0
164 * but a retransmit since the initial packet didn't make it.
167 ieee80211_check_rxseq(struct ieee80211_node *ni, struct ieee80211_frame *wh)
169 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
170 #define SEQ_EQ(a,b) ((int)((a)-(b)) == 0)
171 #define SEQNO(a) ((a) >> IEEE80211_SEQ_SEQ_SHIFT)
172 #define FRAGNO(a) ((a) & IEEE80211_SEQ_FRAG_MASK)
174 uint8_t type, subtype;
176 struct ieee80211_rx_ampdu *rap;
178 rxseq = le16toh(*(uint16_t *)wh->i_seq);
179 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
180 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
183 * Types with no sequence number (or QoS (+)Null frames)
184 * are always treated valid.
186 if (! IEEE80211_HAS_SEQ(type, subtype))
189 tid = ieee80211_gettid(wh);
192 * Only do the HT AMPDU check for WME stations; non-WME HT stations
193 * shouldn't exist outside of debugging. We should at least
196 if (tid < WME_NUM_TID) {
197 rap = &ni->ni_rx_ampdu[tid];
198 /* HT nodes currently doing RX AMPDU are always valid */
199 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
200 (rap->rxa_flags & IEEE80211_AGGR_RUNNING))
205 * Otherwise, retries for packets below or equal to the last
206 * seen sequence number should be dropped.
210 * Treat frame seqnum 4095 as special due to boundary
211 * wrapping conditions.
213 if (SEQNO(ni->ni_rxseqs[tid]) == 4095) {
215 * Drop retransmits on seqnum 4095/current fragment for itself.
217 if (SEQ_EQ(rxseq, ni->ni_rxseqs[tid]) &&
218 (wh->i_fc[1] & IEEE80211_FC1_RETRY))
221 * Treat any subsequent frame as fine if the last seen frame
222 * is 4095 and it's not a retransmit for the same sequence
223 * number. However, this doesn't capture incorrectly ordered
224 * fragments w/ sequence number 4095. It shouldn't be seen
225 * in practice, but see the comment above for further info.
231 * At this point we assume that retransmitted seq/frag numbers below
232 * the current can simply be eliminated.
234 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
235 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid]))
245 void ieee80211_deliver_data(struct ieee80211vap *,
246 struct ieee80211_node *, struct mbuf *);
247 struct mbuf *ieee80211_defrag(struct ieee80211_node *,
249 struct mbuf *ieee80211_realign(struct ieee80211vap *, struct mbuf *, size_t);
250 struct mbuf *ieee80211_decap(struct ieee80211vap *, struct mbuf *, int);
251 struct mbuf *ieee80211_decap1(struct mbuf *, int *);
252 int ieee80211_setup_rates(struct ieee80211_node *ni,
253 const uint8_t *rates, const uint8_t *xrates, int flags);
254 void ieee80211_send_error(struct ieee80211_node *,
255 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg);
256 int ieee80211_alloc_challenge(struct ieee80211_node *);
257 int ieee80211_parse_beacon(struct ieee80211_node *, struct mbuf *,
258 struct ieee80211_channel *,
259 struct ieee80211_scanparams *);
260 int ieee80211_parse_action(struct ieee80211_node *, struct mbuf *);
261 #endif /* _NET80211_IEEE80211_INPUT_H_ */