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 wh->i_addr2, _ssid); \
67 vap->iv_stats.is_rx_ssidmismatch++; \
71 #else /* !IEEE80211_DEBUG */
72 #define IEEE80211_VERIFY_SSID(_ni, _ssid, _action) do { \
73 if ((_ssid)[1] != 0 && \
74 ((_ssid)[1] != (_ni)->ni_esslen || \
75 memcmp((_ssid) + 2, (_ni)->ni_essid, (_ssid)[1]) != 0)) { \
76 vap->iv_stats.is_rx_ssidmismatch++; \
80 #endif /* !IEEE80211_DEBUG */
82 #include <sys/endian.h> /* For le16toh() / le32dec() */
85 iswpaoui(const uint8_t *frm)
87 return frm[1] > 3 && le32dec(frm+2) == ((WPA_OUI_TYPE<<24)|WPA_OUI);
91 iswmeoui(const uint8_t *frm)
93 return frm[1] > 3 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI);
97 iswmeparam(const uint8_t *frm)
99 return frm[1] > 5 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
100 frm[6] == WME_PARAM_OUI_SUBTYPE;
104 iswmeinfo(const uint8_t *frm)
106 return frm[1] > 5 && le32dec(frm+2) == ((WME_OUI_TYPE<<24)|WME_OUI) &&
107 frm[6] == WME_INFO_OUI_SUBTYPE;
111 isatherosoui(const uint8_t *frm)
113 return frm[1] > 3 && le32dec(frm+2) == ((ATH_OUI_TYPE<<24)|ATH_OUI);
117 istdmaoui(const uint8_t *frm)
119 return frm[1] > 3 && le32dec(frm+2) == ((TDMA_OUI_TYPE<<24)|TDMA_OUI);
123 ishtcapoui(const uint8_t *frm)
125 return frm[1] > 3 && le32dec(frm+2) == ((BCM_OUI_HTCAP<<24)|BCM_OUI);
129 ishtinfooui(const uint8_t *frm)
131 return frm[1] > 3 && le32dec(frm+2) == ((BCM_OUI_HTINFO<<24)|BCM_OUI);
135 ieee80211_check_rxseq_amsdu(const struct ieee80211_rx_stats *rxs)
138 return (!! (rxs->c_pktflags & IEEE80211_RX_F_AMSDU));
142 * Return 1 if the rxseq check should increment the sequence
143 * number. Return 0 if it's part of an AMSDU batch and it isn't
144 * the final frame in the decap'ed burst.
147 ieee80211_check_rxseq_amsdu_more(const struct ieee80211_rx_stats *rxs)
153 /* State but no AMSDU set? ok */
154 if ((rxs->c_pktflags & IEEE80211_RX_F_AMSDU) == 0)
157 /* State, AMSDU set, then _MORE means "don't inc yet" */
158 if (rxs->c_pktflags & IEEE80211_RX_F_AMSDU_MORE) {
162 /* Both are set, so return ok */
167 * Check the current frame sequence number against the current TID
168 * state and return whether it's in sequence or should be dropped.
170 * Since out of order packet and duplicate packet eliminations should
171 * be done by the AMPDU RX code, this routine blindly accepts all
172 * frames from a HT station w/ a TID that is currently doing AMPDU-RX.
173 * HT stations without WME or where the TID is not doing AMPDU-RX
174 * are checked like non-HT stations.
176 * The routine only eliminates packets whose sequence/fragment
177 * match or are less than the last seen sequence/fragment number
178 * AND are retransmits It doesn't try to eliminate out of order packets.
180 * Since all frames after sequence number 4095 will be less than 4095
181 * (as the seqnum wraps), handle that special case so packets aren't
182 * incorrectly dropped - ie, if the next packet is sequence number 0
183 * but a retransmit since the initial packet didn't make it.
185 * XXX TODO: handle sequence number space wrapping with dropped frames;
186 * especially in high interference conditions under high traffic load
187 * The RX AMPDU reorder code also needs it.
189 * XXX TODO: update for 802.11-2012 9.3.2.10 Duplicate Detection and Recovery.
192 ieee80211_check_rxseq(struct ieee80211_node *ni, struct ieee80211_frame *wh,
193 uint8_t *bssid, const struct ieee80211_rx_stats *rxs)
195 #define SEQ_LEQ(a,b) ((int)((a)-(b)) <= 0)
196 #define SEQ_EQ(a,b) ((int)((a)-(b)) == 0)
197 #define SEQNO(a) ((a) >> IEEE80211_SEQ_SEQ_SHIFT)
198 #define FRAGNO(a) ((a) & IEEE80211_SEQ_FRAG_MASK)
199 struct ieee80211vap *vap = ni->ni_vap;
201 uint8_t type, subtype;
203 struct ieee80211_rx_ampdu *rap;
205 rxseq = le16toh(*(uint16_t *)wh->i_seq);
206 type = wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK;
207 subtype = wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK;
210 * Types with no sequence number (or QoS (+)Null frames)
211 * are always treated valid.
213 if (! IEEE80211_HAS_SEQ(type, subtype))
217 * Always allow multicast frames for now - QoS (any TID)
220 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
223 tid = ieee80211_gettid(wh);
226 * Only do the HT AMPDU check for WME stations; non-WME HT stations
227 * shouldn't exist outside of debugging. We should at least
230 if (tid < WME_NUM_TID) {
231 rap = &ni->ni_rx_ampdu[tid];
232 /* HT nodes currently doing RX AMPDU are always valid */
233 if ((ni->ni_flags & IEEE80211_NODE_HT) &&
234 (rap->rxa_flags & IEEE80211_AGGR_RUNNING))
239 * Otherwise, retries for packets below or equal to the last
240 * seen sequence number should be dropped.
244 * Treat frame seqnum 4095 as special due to boundary
245 * wrapping conditions.
247 if (SEQNO(ni->ni_rxseqs[tid]) == 4095) {
249 * Drop retransmits on seqnum 4095/current fragment for itself.
251 if (SEQ_EQ(rxseq, ni->ni_rxseqs[tid]) &&
252 (wh->i_fc[1] & IEEE80211_FC1_RETRY))
255 * Treat any subsequent frame as fine if the last seen frame
256 * is 4095 and it's not a retransmit for the same sequence
257 * number. However, this doesn't capture incorrectly ordered
258 * fragments w/ sequence number 4095. It shouldn't be seen
259 * in practice, but see the comment above for further info.
265 * At this point we assume that retransmitted seq/frag numbers below
266 * the current can simply be eliminated.
268 if ((wh->i_fc[1] & IEEE80211_FC1_RETRY) &&
269 SEQ_LEQ(rxseq, ni->ni_rxseqs[tid]))
274 * Only bump the sequence number if it's the last frame
275 * in a batch. That way frames in the rest of the batch
276 * get included, and the last frame in the batch kicks
279 if (ieee80211_check_rxseq_amsdu_more(rxs)) {
280 ni->ni_rxseqs[tid] = rxseq;
281 if ((rxs != NULL) && ieee80211_check_rxseq_amsdu(rxs))
282 IEEE80211_NODE_STAT(ni, rx_amsdu_more_end);
284 /* .. still waiting */
285 IEEE80211_NODE_STAT(ni, rx_amsdu_more);
291 /* duplicate, discard */
292 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT, bssid, "duplicate",
293 "seqno <%u,%u> fragno <%u,%u> tid %u",
294 SEQNO(rxseq), SEQNO(ni->ni_rxseqs[tid]),
295 FRAGNO(rxseq), FRAGNO(ni->ni_rxseqs[tid]), tid);
296 vap->iv_stats.is_rx_dup++;
297 IEEE80211_NODE_STAT(ni, rx_dup);
306 void ieee80211_deliver_data(struct ieee80211vap *,
307 struct ieee80211_node *, struct mbuf *);
308 struct mbuf *ieee80211_defrag(struct ieee80211_node *,
310 struct mbuf *ieee80211_realign(struct ieee80211vap *, struct mbuf *, size_t);
311 struct mbuf *ieee80211_decap(struct ieee80211vap *, struct mbuf *, int);
312 struct mbuf *ieee80211_decap1(struct mbuf *, int *);
313 int ieee80211_setup_rates(struct ieee80211_node *ni,
314 const uint8_t *rates, const uint8_t *xrates, int flags);
315 void ieee80211_send_error(struct ieee80211_node *,
316 const uint8_t mac[IEEE80211_ADDR_LEN], int subtype, int arg);
317 int ieee80211_alloc_challenge(struct ieee80211_node *);
318 int ieee80211_parse_beacon(struct ieee80211_node *, struct mbuf *,
319 struct ieee80211_channel *,
320 struct ieee80211_scanparams *);
321 int ieee80211_parse_action(struct ieee80211_node *, struct mbuf *);
322 #endif /* _NET80211_IEEE80211_INPUT_H_ */