2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2005 Sam Leffler, Errno Consulting
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * Alternatively, this software may be distributed under the terms of the
18 * GNU General Public License ("GPL") version 2 as published by the Free
19 * Software Foundation.
21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
26 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
27 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
28 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
29 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
30 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * $FreeBSD: src/sys/net80211/ieee80211_output.c,v 1.26.2.8 2006/09/02 15:06:04 sam Exp $
33 * $DragonFly: src/sys/netproto/802_11/wlan/ieee80211_output.c,v 1.24 2007/09/15 07:19:23 sephe Exp $
38 #include <sys/param.h>
39 #include <sys/systm.h>
41 #include <sys/kernel.h>
42 #include <sys/endian.h>
44 #include <sys/socket.h>
47 #include <net/ethernet.h>
49 #include <net/if_arp.h>
50 #include <net/if_llc.h>
51 #include <net/if_media.h>
52 #include <net/vlan/if_vlan_var.h>
54 #include <netproto/802_11/ieee80211_var.h>
57 #include <netinet/in.h>
58 #include <netinet/if_ether.h>
59 #include <netinet/in_systm.h>
60 #include <netinet/ip.h>
63 #ifdef IEEE80211_DEBUG
65 * Decide if an outbound management frame should be
66 * printed when debugging is enabled. This filters some
67 * of the less interesting frames that come frequently
71 doprint(struct ieee80211com *ic, int subtype)
74 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
75 return (ic->ic_opmode == IEEE80211_M_IBSS);
82 * Set the direction field and address fields of an outgoing
83 * non-QoS frame. Note this should be called early on in
84 * constructing a frame as it sets i_fc[1]; other bits can
88 ieee80211_send_setup(struct ieee80211com *ic,
89 struct ieee80211_node *ni,
90 struct ieee80211_frame *wh,
92 const uint8_t sa[IEEE80211_ADDR_LEN],
93 const uint8_t da[IEEE80211_ADDR_LEN],
94 const uint8_t bssid[IEEE80211_ADDR_LEN])
96 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
98 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
99 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
100 switch (ic->ic_opmode) {
101 case IEEE80211_M_STA:
102 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
103 IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
104 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
105 IEEE80211_ADDR_COPY(wh->i_addr3, da);
107 case IEEE80211_M_IBSS:
108 case IEEE80211_M_AHDEMO:
109 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
110 IEEE80211_ADDR_COPY(wh->i_addr1, da);
111 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
112 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
114 case IEEE80211_M_HOSTAP:
115 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
116 IEEE80211_ADDR_COPY(wh->i_addr1, da);
117 IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
118 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
120 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */
124 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
125 IEEE80211_ADDR_COPY(wh->i_addr1, da);
126 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
127 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
129 *(uint16_t *)&wh->i_dur[0] = 0;
130 /* NB: use non-QoS tid */
131 *(uint16_t *)&wh->i_seq[0] =
132 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT);
138 * Send a management frame to the specified node. The node pointer
139 * must have a reference as the pointer will be passed to the driver
140 * and potentially held for a long time. If the frame is successfully
141 * dispatched to the driver, then it is responsible for freeing the
142 * reference (and potentially free'ing up any associated storage).
145 ieee80211_mgmt_output(struct ieee80211com *ic, struct ieee80211_node *ni,
146 struct mbuf *m, int type, int timer, int encrypt)
148 struct ifnet *ifp = ic->ic_ifp;
149 struct ieee80211_frame *wh;
151 KASSERT(ni != NULL, ("null node"));
154 * Yech, hack alert! We want to pass the node down to the
155 * driver's start routine. If we don't do so then the start
156 * routine must immediately look it up again and that can
157 * cause a lock order reversal if, for example, this frame
158 * is being sent because the station is being timedout and
159 * the frame being sent is a DEAUTH message. We could stick
160 * this in an m_tag and tack that on to the mbuf. However
161 * that's rather expensive to do for every frame so instead
162 * we stuff it in the rcvif field since outbound frames do
163 * not (presently) use this.
165 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT);
168 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null"));
169 m->m_pkthdr.rcvif = (void *)ni;
171 wh = mtod(m, struct ieee80211_frame *);
172 ieee80211_send_setup(ic, ni, wh,
173 IEEE80211_FC0_TYPE_MGT | type,
174 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid);
176 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
177 "[%6D] encrypting frame (%s)\n",
178 wh->i_addr1, ":", __func__);
179 wh->i_fc[1] |= IEEE80211_FC1_WEP;
181 #ifdef IEEE80211_DEBUG
182 /* avoid printing too many frames */
183 if ((ieee80211_msg_debug(ic) && doprint(ic, type)) ||
184 ieee80211_msg_dumppkts(ic)) {
185 kprintf("[%6D] send %s on channel %u\n",
187 ieee80211_mgt_subtype_name[
188 (type & IEEE80211_FC0_SUBTYPE_MASK) >>
189 IEEE80211_FC0_SUBTYPE_SHIFT],
190 ieee80211_chan2ieee(ic, ic->ic_curchan));
193 IEEE80211_NODE_STAT(ni, tx_mgmt);
194 IF_ENQUEUE(&ic->ic_mgtq, m);
197 * Set the mgt frame timeout.
199 ic->ic_mgt_timer = timer;
207 * Send a null data frame to the specified node.
209 * NB: the caller is assumed to have setup a node reference
210 * for use; this is necessary to deal with a race condition
211 * when probing for inactive stations.
214 ieee80211_send_nulldata(struct ieee80211_node *ni)
216 struct ieee80211com *ic = ni->ni_ic;
217 struct ifnet *ifp = ic->ic_ifp;
219 struct ieee80211_frame *wh;
221 MGETHDR(m, MB_DONTWAIT, MT_HEADER);
224 ic->ic_stats.is_tx_nobuf++;
225 ieee80211_unref_node(&ni);
228 m->m_pkthdr.rcvif = (void *) ni;
230 wh = mtod(m, struct ieee80211_frame *);
231 ieee80211_send_setup(ic, ni, wh,
232 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
233 ic->ic_myaddr, ni->ni_macaddr, ni->ni_bssid);
234 /* NB: power management bit is never sent by an AP */
235 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
236 ic->ic_opmode != IEEE80211_M_HOSTAP)
237 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
238 m->m_len = m->m_pkthdr.len = sizeof(struct ieee80211_frame);
240 IEEE80211_NODE_STAT(ni, tx_data);
242 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
243 "[%s] send null data frame on channel %u, pwr mgt %s\n",
245 ieee80211_chan2ieee(ic, ic->ic_curchan),
246 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
248 IF_ENQUEUE(&ic->ic_mgtq, m); /* cheat */
254 * Assign priority to a frame based on any vlan tag assigned
255 * to the station and/or any Diffserv setting in an IP header.
256 * Finally, if an ACM policy is setup (in station mode) it's
260 ieee80211_classify(struct ieee80211com *ic, struct mbuf *m, struct ieee80211_node *ni)
262 int v_wme_ac = 0, d_wme_ac, ac;
264 struct ether_header *eh;
267 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
274 * If node has a vlan tag then all traffic
275 * to it must have a matching tag.
278 if (ni->ni_vlan != 0) {
279 struct m_tag *mtag = VLAN_OUTPUT_TAG(ic->ic_ifp, m);
281 IEEE80211_NODE_STAT(ni, tx_novlantag);
284 if (EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag)) !=
285 EVL_VLANOFTAG(ni->ni_vlan)) {
286 IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
289 /* map vlan priority to AC */
290 switch (EVL_PRIOFTAG(ni->ni_vlan)) {
293 v_wme_ac = WME_AC_BK;
297 v_wme_ac = WME_AC_BE;
301 v_wme_ac = WME_AC_VI;
305 v_wme_ac = WME_AC_VO;
309 #endif /* FREEBSD_VLAN */
312 eh = mtod(m, struct ether_header *);
313 if (eh->ether_type == htons(ETHERTYPE_IP)) {
314 const struct ip *ip = (struct ip *)
315 (mtod(m, uint8_t *) + sizeof (*eh));
317 * IP frame, map the TOS field.
319 switch (ip->ip_tos) {
322 d_wme_ac = WME_AC_BK; /* background */
326 d_wme_ac = WME_AC_VI; /* video */
328 case 0x30: /* voice */
330 case 0x88: /* XXX UPSD */
332 d_wme_ac = WME_AC_VO;
335 d_wme_ac = WME_AC_BE;
340 d_wme_ac = WME_AC_BE;
345 * Use highest priority AC.
347 if (v_wme_ac > d_wme_ac)
355 if (ic->ic_opmode == IEEE80211_M_STA) {
356 static const int acmap[4] = {
357 WME_AC_BK, /* WME_AC_BE */
358 WME_AC_BK, /* WME_AC_BK */
359 WME_AC_BE, /* WME_AC_VI */
360 WME_AC_VI, /* WME_AC_VO */
362 while (ac != WME_AC_BK &&
363 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
372 * Insure there is sufficient contiguous space to encapsulate the
373 * 802.11 data frame. If room isn't already there, arrange for it.
374 * Drivers and cipher modules assume we have done the necessary work
375 * and fail rudely if they don't find the space they need.
378 ieee80211_mbuf_adjust(struct ieee80211com *ic, int hdrsize,
379 struct ieee80211_key *key, struct mbuf *m)
381 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
382 int needed_space = hdrsize + ic->ic_headroom;
385 /* XXX belongs in crypto code? */
386 if ((key->wk_flags & IEEE80211_KEY_NOHDR) == 0)
387 needed_space += key->wk_cipher->ic_header;
390 * When crypto is being done in the host we must insure
391 * the data are writable for the cipher routines; clone
392 * a writable mbuf chain.
393 * XXX handle SWMIC specially
395 if (key->wk_flags & (IEEE80211_KEY_SWCRYPT|IEEE80211_KEY_SWMIC)) {
396 m = ieee80211_mbuf_clone(m, MB_DONTWAIT);
398 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
399 "%s: cannot get writable mbuf\n", __func__);
400 ic->ic_stats.is_tx_nobuf++; /* XXX new stat */
406 * We know we are called just before stripping an Ethernet
407 * header and prepending an LLC header. This means we know
409 * sizeof(struct ether_header) - sizeof(struct llc)
410 * bytes recovered to which we need additional space for the
411 * 802.11 header and any crypto header.
413 /* XXX check trailing space and copy instead? */
414 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
415 struct mbuf *n = m_gethdr(MB_DONTWAIT, m->m_type);
417 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
418 "%s: cannot expand storage\n", __func__);
419 ic->ic_stats.is_tx_nobuf++;
423 KASSERT(needed_space <= MHLEN,
424 ("not enough room, need %u got %zu\n", needed_space, MHLEN));
426 * Setup new mbuf to have leading space to prepend the
427 * 802.11 header and any crypto header bits that are
428 * required (the latter are added when the driver calls
429 * back to ieee80211_crypto_encap to do crypto encapsulation).
431 /* NB: must be first 'cuz it clobbers m_data */
433 n->m_len = 0; /* NB: m_gethdr does not set */
434 n->m_data += needed_space;
436 * Pull up Ethernet header to create the expected layout.
437 * We could use m_pullup but that's overkill (i.e. we don't
438 * need the actual data) and it cannot fail so do it inline
441 /* NB: struct ether_header is known to be contiguous */
442 n->m_len += sizeof(struct ether_header);
443 m->m_len -= sizeof(struct ether_header);
444 m->m_data += sizeof(struct ether_header);
446 * Replace the head of the chain.
452 #undef TO_BE_RECLAIMED
455 #define KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none)
457 * Return the transmit key to use in sending a unicast frame.
458 * If a unicast key is set we use that. When no unicast key is set
459 * we fall back to the default transmit key.
461 static __inline struct ieee80211_key *
462 ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni)
464 if (KEY_UNDEFINED(ni->ni_ucastkey)) {
465 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE ||
466 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey]))
468 return &ic->ic_nw_keys[ic->ic_def_txkey];
470 return &ni->ni_ucastkey;
475 * Return the transmit key to use in sending a multicast frame.
476 * Multicast traffic always uses the group key which is installed as
477 * the default tx key.
479 static __inline struct ieee80211_key *
480 ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni)
482 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE ||
483 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey]))
485 return &ic->ic_nw_keys[ic->ic_def_txkey];
489 * Encapsulate an outbound data frame. The mbuf chain is updated.
490 * If an error is encountered NULL is returned. The caller is required
491 * to provide a node reference and pullup the ethernet header in the
495 ieee80211_encap(struct ieee80211com *ic, struct mbuf *m,
496 struct ieee80211_node *ni)
498 struct ether_header eh;
499 struct ieee80211_frame *wh;
500 struct ieee80211_key *key;
502 int hdrsize, datalen, addqos;
504 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
505 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header));
508 * Insure space for additional headers. First identify
509 * transmit key to use in calculating any buffer adjustments
510 * required. This is also used below to do privacy
511 * encapsulation work. Then calculate the 802.11 header
512 * size and any padding required by the driver.
514 * Note key may be NULL if we fall back to the default
515 * transmit key and that is not set. In that case the
516 * buffer may not be expanded as needed by the cipher
517 * routines, but they will/should discard it.
519 if (ic->ic_flags & IEEE80211_F_PRIVACY) {
520 if (ic->ic_opmode == IEEE80211_M_STA ||
521 !IEEE80211_IS_MULTICAST(eh.ether_dhost))
522 key = ieee80211_crypto_getucastkey(ic, ni);
524 key = ieee80211_crypto_getmcastkey(ic, ni);
525 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) {
526 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
527 "[%6D] no default transmit key (%s) deftxkey %u\n",
528 eh.ether_dhost, ":", __func__,
530 ic->ic_stats.is_tx_nodefkey++;
535 /* XXX 4-address format */
537 * XXX Some ap's don't handle QoS-encapsulated EAPOL
538 * frames so suppress use. This may be an issue if other
539 * ap's require all data frames to be QoS-encapsulated
540 * once negotiated in which case we'll need to make this
543 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) &&
544 eh.ether_type != htons(ETHERTYPE_PAE);
546 hdrsize = sizeof(struct ieee80211_qosframe);
548 hdrsize = sizeof(struct ieee80211_frame);
549 if (ic->ic_flags & IEEE80211_F_DATAPAD)
550 hdrsize = roundup(hdrsize, sizeof(uint32_t));
551 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m);
553 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
557 /* NB: this could be optimized because of ieee80211_mbuf_adjust */
558 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
559 llc = mtod(m, struct llc *);
560 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
561 llc->llc_control = LLC_UI;
562 llc->llc_snap.org_code[0] = 0;
563 llc->llc_snap.org_code[1] = 0;
564 llc->llc_snap.org_code[2] = 0;
565 llc->llc_snap.ether_type = eh.ether_type;
566 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
568 M_PREPEND(m, hdrsize, MB_DONTWAIT);
570 ic->ic_stats.is_tx_nobuf++;
573 wh = mtod(m, struct ieee80211_frame *);
574 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
575 *(uint16_t *)wh->i_dur = 0;
576 switch (ic->ic_opmode) {
577 case IEEE80211_M_STA:
578 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
579 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
580 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
581 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
583 case IEEE80211_M_IBSS:
584 case IEEE80211_M_AHDEMO:
585 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
586 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
587 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
589 * NB: always use the bssid from ic_bss as the
590 * neighbor's may be stale after an ibss merge
592 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid);
594 case IEEE80211_M_HOSTAP:
595 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
596 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
597 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
598 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
600 case IEEE80211_M_MONITOR:
603 if (m->m_flags & M_MORE_DATA)
604 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
606 struct ieee80211_qosframe *qwh =
607 (struct ieee80211_qosframe *) wh;
611 /* map from access class/queue to 11e header priorty value */
612 tid = WME_AC_TO_TID(ac);
613 qwh->i_qos[0] = tid & IEEE80211_QOS_TID;
614 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
615 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S;
617 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
619 *(uint16_t *)wh->i_seq =
620 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT);
621 ni->ni_txseqs[tid]++;
623 *(uint16_t *)wh->i_seq =
624 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT);
629 * IEEE 802.1X: send EAPOL frames always in the clear.
630 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
632 if (eh.ether_type != htons(ETHERTYPE_PAE) ||
633 ((ic->ic_flags & IEEE80211_F_WPA) &&
634 (ic->ic_opmode == IEEE80211_M_STA ?
635 !KEY_UNDEFINED(*key) : !KEY_UNDEFINED(ni->ni_ucastkey)))) {
636 wh->i_fc[1] |= IEEE80211_FC1_WEP;
637 /* XXX do fragmentation */
638 if (!ieee80211_crypto_enmic(ic, key, m, 0)) {
639 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
640 "[%6D] enmic failed, discard frame\n",
641 eh.ether_dhost, ":");
642 ic->ic_stats.is_crypto_enmicfail++;
648 IEEE80211_NODE_STAT(ni, tx_data);
649 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
650 IEEE80211_NODE_STAT(ni, tx_mcast);
652 IEEE80211_NODE_STAT(ni, tx_ucast);
653 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
663 * Add a supported rates element id to a frame.
666 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
670 *frm++ = IEEE80211_ELEMID_RATES;
671 nrates = rs->rs_nrates;
672 if (nrates > IEEE80211_RATE_SIZE)
673 nrates = IEEE80211_RATE_SIZE;
675 memcpy(frm, rs->rs_rates, nrates);
680 * Add an extended supported rates element id to a frame.
683 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
686 * Add an extended supported rates element if operating in 11g mode.
688 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
689 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
690 *frm++ = IEEE80211_ELEMID_XRATES;
692 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
699 * Add an ssid elemet to a frame.
702 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
704 *frm++ = IEEE80211_ELEMID_SSID;
706 memcpy(frm, ssid, len);
711 * Add an erp element to a frame.
714 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
718 *frm++ = IEEE80211_ELEMID_ERP;
721 if (ic->ic_nonerpsta != 0)
722 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
723 if (ic->ic_flags & IEEE80211_F_USEPROT)
724 erp |= IEEE80211_ERP_USE_PROTECTION;
725 if (ic->ic_flags & IEEE80211_F_USEBARKER)
726 erp |= IEEE80211_ERP_LONG_PREAMBLE;
732 ieee80211_setup_wpa_ie(struct ieee80211com *ic, uint8_t *ie)
734 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2
735 #define ADDSHORT(frm, v) do { \
736 frm[0] = (v) & 0xff; \
740 #define ADDSELECTOR(frm, sel) do { \
741 memcpy(frm, sel, 4); \
744 static const uint8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE };
745 static const uint8_t cipher_suite[][4] = {
746 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */
747 { WPA_OUI_BYTES, WPA_CSE_TKIP },
748 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */
749 { WPA_OUI_BYTES, WPA_CSE_CCMP },
750 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */
751 { WPA_OUI_BYTES, WPA_CSE_NULL },
753 static const uint8_t wep104_suite[4] =
754 { WPA_OUI_BYTES, WPA_CSE_WEP104 };
755 static const uint8_t key_mgt_unspec[4] =
756 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC };
757 static const uint8_t key_mgt_psk[4] =
758 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK };
759 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn;
763 *frm++ = IEEE80211_ELEMID_VENDOR;
764 *frm++ = 0; /* length filled in below */
765 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */
767 ADDSHORT(frm, WPA_VERSION);
769 /* XXX filter out CKIP */
771 /* multicast cipher */
772 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP &&
773 rsn->rsn_mcastkeylen >= 13)
774 ADDSELECTOR(frm, wep104_suite);
776 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]);
778 /* unicast cipher list */
780 ADDSHORT(frm, 0); /* selector count */
781 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) {
783 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]);
785 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) {
787 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]);
790 /* authenticator selector list */
792 ADDSHORT(frm, 0); /* selector count */
793 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) {
795 ADDSELECTOR(frm, key_mgt_unspec);
797 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) {
799 ADDSELECTOR(frm, key_mgt_psk);
802 /* optional capabilities */
803 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH)
804 ADDSHORT(frm, rsn->rsn_caps);
806 /* calculate element length */
807 ie[1] = frm - ie - 2;
808 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa),
809 ("WPA IE too big, %u > %zu",
810 ie[1]+2, sizeof(struct ieee80211_ie_wpa)));
818 ieee80211_setup_rsn_ie(struct ieee80211com *ic, uint8_t *ie)
820 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac
821 #define ADDSHORT(frm, v) do { \
822 frm[0] = (v) & 0xff; \
826 #define ADDSELECTOR(frm, sel) do { \
827 memcpy(frm, sel, 4); \
830 static const uint8_t cipher_suite[][4] = {
831 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */
832 { RSN_OUI_BYTES, RSN_CSE_TKIP },
833 { RSN_OUI_BYTES, RSN_CSE_WRAP },
834 { RSN_OUI_BYTES, RSN_CSE_CCMP },
835 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */
836 { RSN_OUI_BYTES, RSN_CSE_NULL },
838 static const uint8_t wep104_suite[4] =
839 { RSN_OUI_BYTES, RSN_CSE_WEP104 };
840 static const uint8_t key_mgt_unspec[4] =
841 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC };
842 static const uint8_t key_mgt_psk[4] =
843 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK };
844 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn;
848 *frm++ = IEEE80211_ELEMID_RSN;
849 *frm++ = 0; /* length filled in below */
850 ADDSHORT(frm, RSN_VERSION);
852 /* XXX filter out CKIP */
854 /* multicast cipher */
855 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP &&
856 rsn->rsn_mcastkeylen >= 13)
857 ADDSELECTOR(frm, wep104_suite);
859 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]);
861 /* unicast cipher list */
863 ADDSHORT(frm, 0); /* selector count */
864 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) {
866 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]);
868 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) {
870 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]);
873 /* authenticator selector list */
875 ADDSHORT(frm, 0); /* selector count */
876 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) {
878 ADDSELECTOR(frm, key_mgt_unspec);
880 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) {
882 ADDSELECTOR(frm, key_mgt_psk);
885 /* optional capabilities */
886 ADDSHORT(frm, rsn->rsn_caps);
889 /* calculate element length */
890 ie[1] = frm - ie - 2;
891 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa),
892 ("RSN IE too big, %u > %zu",
893 ie[1]+2, sizeof(struct ieee80211_ie_wpa)));
901 * Add a WPA/RSN element to a frame.
904 ieee80211_add_wpa(uint8_t *frm, struct ieee80211com *ic)
907 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!"));
908 if (ic->ic_flags & IEEE80211_F_WPA2)
909 frm = ieee80211_setup_rsn_ie(ic, frm);
910 if (ic->ic_flags & IEEE80211_F_WPA1)
911 frm = ieee80211_setup_wpa_ie(ic, frm);
915 #define WME_OUI_BYTES 0x00, 0x50, 0xf2
917 * Add a WME information element to a frame.
920 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
922 static const struct ieee80211_wme_info info = {
923 .wme_id = IEEE80211_ELEMID_VENDOR,
924 .wme_len = sizeof(struct ieee80211_wme_info) - 2,
925 .wme_oui = { WME_OUI_BYTES },
926 .wme_type = WME_OUI_TYPE,
927 .wme_subtype = WME_INFO_OUI_SUBTYPE,
928 .wme_version = WME_VERSION,
931 memcpy(frm, &info, sizeof(info));
932 return frm + sizeof(info);
936 * Add a WME parameters element to a frame.
939 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
941 #define SM(_v, _f) (((_v) << _f##_S) & _f)
942 #define ADDSHORT(frm, v) do { \
943 frm[0] = (v) & 0xff; \
947 /* NB: this works 'cuz a param has an info at the front */
948 static const struct ieee80211_wme_info param = {
949 .wme_id = IEEE80211_ELEMID_VENDOR,
950 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
951 .wme_oui = { WME_OUI_BYTES },
952 .wme_type = WME_OUI_TYPE,
953 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
954 .wme_version = WME_VERSION,
958 memcpy(frm, ¶m, sizeof(param));
959 frm += __offsetof(struct ieee80211_wme_info, wme_info);
960 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */
961 *frm++ = 0; /* reserved field */
962 for (i = 0; i < WME_NUM_AC; i++) {
963 const struct wmeParams *ac =
964 &wme->wme_bssChanParams.cap_wmeParams[i];
965 *frm++ = SM(i, WME_PARAM_ACI)
966 | SM(ac->wmep_acm, WME_PARAM_ACM)
967 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
969 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
970 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
972 ADDSHORT(frm, ac->wmep_txopLimit);
981 * Send a probe request frame with the specified ssid
982 * and any optional information element data.
985 ieee80211_send_probereq(struct ieee80211_node *ni,
986 const uint8_t sa[IEEE80211_ADDR_LEN],
987 const uint8_t da[IEEE80211_ADDR_LEN],
988 const uint8_t bssid[IEEE80211_ADDR_LEN],
989 const uint8_t *ssid, size_t ssidlen,
990 const void *optie, size_t optielen)
992 struct ieee80211com *ic = ni->ni_ic;
993 struct ifnet *ifp = ic->ic_ifp;
994 enum ieee80211_phymode mode;
995 struct ieee80211_frame *wh;
996 struct ieee80211_rateset rs;
1001 * Hold a reference on the node so it doesn't go away until after
1002 * the xmit is complete all the way in the driver. On error we
1003 * will remove our reference.
1005 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1006 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n",
1008 ni, ni->ni_macaddr, ":",
1009 ieee80211_node_refcnt(ni) + 1);
1010 ieee80211_ref_node(ni);
1013 * prreq frame format
1015 * [tlv] supported rates
1016 * [tlv] extended supported rates
1017 * [tlv] user-specified ie's
1019 m = ieee80211_getmgtframe(&frm,
1020 ic->ic_headroom + sizeof(struct ieee80211_frame),
1021 2 + IEEE80211_NWID_LEN
1022 + 2 + IEEE80211_RATE_SIZE
1023 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1024 + (optie != NULL ? optielen : 0)
1027 ic->ic_stats.is_tx_nobuf++;
1028 ieee80211_free_node(ni);
1032 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
1036 * Clear basic rates.
1038 * Though according to 802.11 standard: MSB of each supported rate
1039 * octet in (Extended) Supported Rates ie of probe requests should
1040 * be ignored, some HostAP implementations still check it ...
1042 mode = ieee80211_chan2mode(ic, ic->ic_curchan);
1043 rs = ic->ic_sup_rates[mode];
1044 ieee80211_set_basicrates(&rs, IEEE80211_MODE_AUTO, 0);
1045 frm = ieee80211_add_rates(frm, &rs);
1046 frm = ieee80211_add_xrates(frm, &rs);
1048 if (optie != NULL) {
1049 memcpy(frm, optie, optielen);
1052 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1054 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT);
1057 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null"));
1058 m->m_pkthdr.rcvif = (void *)ni;
1060 wh = mtod(m, struct ieee80211_frame *);
1061 ieee80211_send_setup(ic, ni, wh,
1062 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
1064 /* XXX power management? */
1066 IEEE80211_NODE_STAT(ni, tx_probereq);
1067 IEEE80211_NODE_STAT(ni, tx_mgmt);
1069 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
1070 "[%6D] send probe req on channel %u\n",
1072 ieee80211_chan2ieee(ic, ic->ic_curchan));
1074 IF_ENQUEUE(&ic->ic_mgtq, m);
1080 * Calculate capability information for mgt frames.
1083 getcapinfo(struct ieee80211com *ic, struct ieee80211_channel *chan)
1087 KASSERT(ic->ic_opmode != IEEE80211_M_STA, ("station mode"));
1089 if (ic->ic_opmode == IEEE80211_M_HOSTAP)
1090 capinfo = IEEE80211_CAPINFO_ESS;
1091 else if (ic->ic_opmode == IEEE80211_M_IBSS)
1092 capinfo = IEEE80211_CAPINFO_IBSS;
1095 if (ic->ic_flags & IEEE80211_F_PRIVACY)
1096 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1097 if (IEEE80211_IS_CHAN_2GHZ(chan)) {
1098 if (ic->ic_flags & IEEE80211_F_SHPREAMBLE)
1099 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1100 if (ic->ic_caps_ext & IEEE80211_CEXT_PBCC)
1101 capinfo |= IEEE80211_CAPINFO_PBCC;
1103 if (ic->ic_flags & IEEE80211_F_SHSLOT)
1104 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1108 static struct mbuf *
1109 _ieee80211_probe_resp_alloc(struct ieee80211com *ic, struct ieee80211_node *ni)
1111 const struct ieee80211_rateset *rs;
1118 * probe response frame format
1120 * [2] beacon interval
1121 * [2] cabability information
1123 * [tlv] supported rates
1124 * [tlv] parameter set (FH/DS)
1125 * [4] parameter set (IBSS)
1126 * [tlv] extended rate phy (ERP)
1127 * [tlv] extended supported rates
1129 * [tlv] WME (optional)
1131 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO);
1132 rs = &ic->ic_sup_rates[ic->ic_curmode];
1133 pktlen = 8 /* time stamp */
1134 + sizeof(uint16_t) /* beacon interval */
1135 + sizeof(uint16_t) /* capabilities */
1136 + 2 + ni->ni_esslen /* ssid */
1137 + 2 + IEEE80211_RATE_SIZE /* supported rates */
1138 + 2 + 5 /* max(5,1) */ /* DS/FH parameters */
1139 + 2 + 2 /* IBSS parameters */
1141 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1142 /* XXX !WPA1+WPA2 fits w/o a cluster */
1143 + (ic->ic_flags & IEEE80211_F_WPA ? /* WPA 1+2 */
1144 2*sizeof(struct ieee80211_ie_wpa) : 0)
1145 + sizeof(struct ieee80211_wme_param); /* WME */
1147 m = ieee80211_getmgtframe(&frm,
1148 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
1150 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1151 "%s: cannot get buf; size %u\n", __func__, pktlen);
1152 ic->ic_stats.is_tx_nobuf++;
1156 memset(frm, 0, 8); /* timestamp should be filled later */
1158 *(uint16_t *)frm = htole16(ni->ni_intval);
1160 capinfo = getcapinfo(ic, ni->ni_chan);
1161 *(uint16_t *)frm = htole16(capinfo);
1164 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
1165 frm = ieee80211_add_rates(frm, rs);
1167 if (ic->ic_phytype == IEEE80211_T_FH) {
1168 *frm++ = IEEE80211_ELEMID_FHPARMS;
1170 *frm++ = ni->ni_fhdwell & 0x00ff;
1171 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff;
1172 *frm++ = IEEE80211_FH_CHANSET(
1173 ieee80211_chan2ieee(ic, ni->ni_chan));
1174 *frm++ = IEEE80211_FH_CHANPAT(
1175 ieee80211_chan2ieee(ic, ni->ni_chan));
1176 *frm++ = ni->ni_fhindex;
1178 *frm++ = IEEE80211_ELEMID_DSPARMS;
1180 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
1183 if (ic->ic_opmode == IEEE80211_M_IBSS) {
1184 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
1186 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
1188 if (ic->ic_flags & IEEE80211_F_WPA)
1189 frm = ieee80211_add_wpa(frm, ic);
1190 if (ic->ic_curmode == IEEE80211_MODE_11G)
1191 frm = ieee80211_add_erp(frm, ic);
1192 frm = ieee80211_add_xrates(frm, rs);
1193 if (ic->ic_flags & IEEE80211_F_WME)
1194 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
1195 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1196 KKASSERT(m->m_len <= pktlen);
1202 * Send a management frame. The node is for the destination (or ic_bss
1203 * when in station mode). Nodes other than ic_bss have their reference
1204 * count bumped to reflect our use for an indeterminant time.
1207 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni,
1210 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0)
1214 int has_challenge, is_shared_key, ret, timer, status, encrypt;
1215 const struct ieee80211_rateset *rs;
1217 KASSERT(ni != NULL, ("null node"));
1220 * Hold a reference on the node so it doesn't go away until after
1221 * the xmit is complete all the way in the driver. On error we
1222 * will remove our reference.
1224 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1225 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n",
1227 ni, ni->ni_macaddr, ":",
1228 ieee80211_node_refcnt(ni) + 1);
1229 ieee80211_ref_node(ni);
1234 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1235 m = _ieee80211_probe_resp_alloc(ic, ic->ic_bss);
1237 /* NB: Statistics have been updated. */
1243 case IEEE80211_FC0_SUBTYPE_AUTH:
1246 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
1247 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
1248 ni->ni_challenge != NULL);
1251 * Deduce whether we're doing open authentication or
1252 * shared key authentication. We do the latter if
1253 * we're in the middle of a shared key authentication
1254 * handshake or if we're initiating an authentication
1255 * request and configured to use shared key.
1257 is_shared_key = has_challenge ||
1258 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
1259 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
1260 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED);
1262 m = ieee80211_getmgtframe(&frm,
1263 ic->ic_headroom + sizeof(struct ieee80211_frame),
1264 3 * sizeof(uint16_t)
1265 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
1266 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
1269 senderr(ENOMEM, is_tx_nobuf);
1271 ((uint16_t *)frm)[0] =
1272 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
1273 : htole16(IEEE80211_AUTH_ALG_OPEN);
1274 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
1275 ((uint16_t *)frm)[2] = htole16(status);/* status */
1277 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
1278 ((uint16_t *)frm)[3] =
1279 htole16((IEEE80211_CHALLENGE_LEN << 8) |
1280 IEEE80211_ELEMID_CHALLENGE);
1281 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
1282 IEEE80211_CHALLENGE_LEN);
1283 m->m_pkthdr.len = m->m_len =
1284 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
1285 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
1286 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
1287 "[%6D] request encrypt frame (%s)\n",
1288 ni->ni_macaddr, ":", __func__);
1289 encrypt = 1; /* WEP-encrypt, please */
1292 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
1294 /* XXX not right for shared key */
1295 if (status == IEEE80211_STATUS_SUCCESS)
1296 IEEE80211_NODE_STAT(ni, tx_auth);
1298 IEEE80211_NODE_STAT(ni, tx_auth_fail);
1300 if (ic->ic_opmode == IEEE80211_M_STA)
1301 timer = IEEE80211_TRANS_WAIT;
1304 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1305 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
1306 "[%6D] send station deauthenticate (reason %d)\n",
1307 ni->ni_macaddr, ":", arg);
1308 m = ieee80211_getmgtframe(&frm,
1309 ic->ic_headroom + sizeof(struct ieee80211_frame),
1312 senderr(ENOMEM, is_tx_nobuf);
1313 *(uint16_t *)frm = htole16(arg); /* reason */
1314 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
1316 IEEE80211_NODE_STAT(ni, tx_deauth);
1317 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
1319 ieee80211_node_unauthorize(ni); /* port closed */
1322 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1323 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1325 * asreq frame format
1326 * [2] capability information
1327 * [2] listen interval
1328 * [6*] current AP address (reassoc only)
1330 * [tlv] supported rates
1331 * [tlv] extended supported rates
1333 * [tlv] user-specified ie's
1335 m = ieee80211_getmgtframe(&frm,
1336 ic->ic_headroom + sizeof(struct ieee80211_frame),
1339 + IEEE80211_ADDR_LEN
1340 + 2 + IEEE80211_NWID_LEN
1341 + 2 + IEEE80211_RATE_SIZE
1342 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1343 + sizeof(struct ieee80211_wme_info)
1344 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0)
1347 senderr(ENOMEM, is_tx_nobuf);
1349 KASSERT(ic->ic_opmode == IEEE80211_M_STA,
1350 ("wrong mode %u", ic->ic_opmode));
1351 capinfo = IEEE80211_CAPINFO_ESS;
1352 if (ic->ic_flags & IEEE80211_F_PRIVACY)
1353 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1355 * NB: Some 11a AP's reject the request when
1356 * short premable or PBCC modulation is set.
1358 if (IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) {
1359 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
1360 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1361 if (ic->ic_caps_ext & IEEE80211_CEXT_PBCC)
1362 capinfo |= IEEE80211_CAPINFO_PBCC;
1364 if (IEEE80211_IS_CHAN_2GHZ(ni->ni_chan) &&
1365 (ic->ic_caps & IEEE80211_C_SHSLOT))
1366 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1367 *(uint16_t *)frm = htole16(capinfo);
1370 KKASSERT(ic->ic_bss->ni_intval != 0);
1371 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
1372 ic->ic_bss->ni_intval));
1375 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1376 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid);
1377 frm += IEEE80211_ADDR_LEN;
1380 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
1382 rs = &ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)];
1383 frm = ieee80211_add_rates(frm, rs);
1384 frm = ieee80211_add_xrates(frm, rs);
1386 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL)
1387 frm = ieee80211_add_wme_info(frm, &ic->ic_wme);
1388 if (ic->ic_opt_ie != NULL) {
1389 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len);
1390 frm += ic->ic_opt_ie_len;
1392 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1394 timer = IEEE80211_TRANS_WAIT;
1397 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1398 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1400 * asreq frame format
1401 * [2] capability information
1403 * [2] association ID
1404 * [tlv] supported rates
1405 * [tlv] extended supported rates
1406 * [tlv] WME (if enabled and STA enabled)
1408 m = ieee80211_getmgtframe(&frm,
1409 ic->ic_headroom + sizeof(struct ieee80211_frame),
1413 + 2 + IEEE80211_RATE_SIZE
1414 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1415 + sizeof(struct ieee80211_wme_param)
1418 senderr(ENOMEM, is_tx_nobuf);
1420 capinfo = getcapinfo(ic, ic->ic_curchan);
1421 *(uint16_t *)frm = htole16(capinfo);
1424 *(uint16_t *)frm = htole16(arg); /* status */
1427 if (arg == IEEE80211_STATUS_SUCCESS) {
1428 *(uint16_t *)frm = htole16(ni->ni_associd);
1429 IEEE80211_NODE_STAT(ni, tx_assoc);
1431 IEEE80211_NODE_STAT(ni, tx_assoc_fail);
1434 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO);
1435 rs = &ic->ic_sup_rates[ic->ic_curmode];
1436 frm = ieee80211_add_rates(frm, rs);
1437 frm = ieee80211_add_xrates(frm, rs);
1438 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL)
1439 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
1440 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1443 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1444 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
1445 "[%6D] send station disassociate (reason %d)\n",
1446 ni->ni_macaddr, ":", arg);
1447 m = ieee80211_getmgtframe(&frm,
1448 ic->ic_headroom + sizeof(struct ieee80211_frame),
1451 senderr(ENOMEM, is_tx_nobuf);
1452 *(uint16_t *)frm = htole16(arg); /* reason */
1453 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
1455 IEEE80211_NODE_STAT(ni, tx_disassoc);
1456 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
1460 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1461 "[%6D] invalid mgmt frame type %u\n",
1462 ni->ni_macaddr, ":", type);
1463 senderr(EINVAL, is_tx_unknownmgt);
1466 ret = ieee80211_mgmt_output(ic, ni, m, type, timer, encrypt);
1469 ieee80211_free_node(ni);
1476 * Allocate a probe response frame and fillin the appropriate bits.
1479 ieee80211_probe_resp_alloc(struct ieee80211com *ic, struct ieee80211_node *ni)
1481 struct ieee80211_frame *wh;
1484 m = _ieee80211_probe_resp_alloc(ic, ni);
1488 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT);
1489 KASSERT(m != NULL, ("no space for 802.11 header?"));
1491 wh = mtod(m, struct ieee80211_frame *);
1492 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
1493 IEEE80211_FC0_SUBTYPE_PROBE_RESP;
1494 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1495 *(uint16_t *)wh->i_dur = 0;
1496 bzero(wh->i_addr1, sizeof(wh->i_addr1));
1497 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr);
1498 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
1499 *(uint16_t *)wh->i_seq = 0;
1505 * Allocate a beacon frame and fillin the appropriate bits.
1508 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni,
1509 struct ieee80211_beacon_offsets *bo)
1511 struct ifnet *ifp = ic->ic_ifp;
1512 struct ieee80211_frame *wh;
1515 uint8_t *frm, *efrm;
1517 const struct ieee80211_rateset *rs;
1520 * beacon frame format
1522 * [2] beacon interval
1523 * [2] cabability information
1525 * [tlv] supported rates
1526 * [3] parameter set (DS)
1527 * [tlv] parameter set (IBSS/TIM)
1528 * [tlv] extended rate phy (ERP)
1529 * [tlv] extended supported rates
1530 * [tlv] WME parameters
1531 * [tlv] WPA/RSN parameters
1532 * XXX Vendor-specific OIDs (e.g. Atheros)
1533 * NB: we allocate the max space required for the TIM bitmap.
1535 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO);
1536 rs = &ic->ic_sup_rates[ic->ic_curmode];
1537 pktlen = 8 /* time stamp */
1538 + sizeof(uint16_t) /* beacon interval */
1539 + sizeof(uint16_t) /* capabilities */
1540 + 2 + ni->ni_esslen /* ssid */
1541 + 2 + IEEE80211_RATE_SIZE /* supported rates */
1542 + 2 + 1 /* DS parameters */
1543 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */
1545 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1546 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */
1547 sizeof(struct ieee80211_wme_param) : 0)
1548 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
1549 2*sizeof(struct ieee80211_ie_wpa) : 0)
1551 m = ieee80211_getmgtframe(&frm,
1552 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
1554 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1555 "%s: cannot get buf; size %u\n", __func__, pktlen);
1556 ic->ic_stats.is_tx_nobuf++;
1560 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */
1562 *(uint16_t *)frm = htole16(ni->ni_intval);
1564 capinfo = getcapinfo(ic, ni->ni_chan);
1565 bo->bo_caps = (uint16_t *)frm;
1566 *(uint16_t *)frm = htole16(capinfo);
1568 *frm++ = IEEE80211_ELEMID_SSID;
1569 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) {
1570 *frm++ = ni->ni_esslen;
1571 memcpy(frm, ni->ni_essid, ni->ni_esslen);
1572 frm += ni->ni_esslen;
1575 frm = ieee80211_add_rates(frm, rs);
1576 if (ic->ic_curmode != IEEE80211_MODE_FH) {
1577 *frm++ = IEEE80211_ELEMID_DSPARMS;
1579 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
1582 if (ic->ic_opmode == IEEE80211_M_IBSS) {
1583 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
1585 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
1587 } else if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
1588 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
1590 tie->tim_ie = IEEE80211_ELEMID_TIM;
1591 tie->tim_len = 4; /* length */
1592 tie->tim_count = 0; /* DTIM count */
1593 tie->tim_period = ic->ic_dtim_period; /* DTIM period */
1594 tie->tim_bitctl = 0; /* bitmap control */
1595 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
1596 frm += sizeof(struct ieee80211_tim_ie);
1599 bo->bo_trailer = frm;
1600 if (ic->ic_flags & IEEE80211_F_WME) {
1602 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
1603 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE;
1605 if (ic->ic_flags & IEEE80211_F_WPA)
1606 frm = ieee80211_add_wpa(frm, ic);
1607 if (ic->ic_curmode == IEEE80211_MODE_11G) {
1609 frm = ieee80211_add_erp(frm, ic);
1611 efrm = ieee80211_add_xrates(frm, rs);
1612 bo->bo_trailer_len = efrm - bo->bo_trailer;
1613 m->m_pkthdr.len = m->m_len = efrm - mtod(m, uint8_t *);
1614 KKASSERT(m->m_len <= pktlen);
1616 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT);
1617 KASSERT(m != NULL, ("no space for 802.11 header?"));
1618 wh = mtod(m, struct ieee80211_frame *);
1619 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
1620 IEEE80211_FC0_SUBTYPE_BEACON;
1621 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1622 *(uint16_t *)wh->i_dur = 0;
1623 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
1624 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr);
1625 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
1626 *(uint16_t *)wh->i_seq = 0;
1632 * Update the dynamic parts of a beacon frame based on the current state.
1635 ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni,
1636 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast)
1638 int len_changed = 0;
1641 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer);
1643 /* XXX faster to recalculate entirely or just changes? */
1644 capinfo = getcapinfo(ic, ni->ni_chan);
1645 *bo->bo_caps = htole16(capinfo);
1647 if (ic->ic_flags & IEEE80211_F_WME) {
1648 struct ieee80211_wme_state *wme = &ic->ic_wme;
1651 * Check for agressive mode change. When there is
1652 * significant high priority traffic in the BSS
1653 * throttle back BE traffic by using conservative
1654 * parameters. Otherwise BE uses agressive params
1655 * to optimize performance of legacy/non-QoS traffic.
1657 if (wme->wme_flags & WME_F_AGGRMODE) {
1658 if (wme->wme_hipri_traffic >
1659 wme->wme_hipri_switch_thresh) {
1660 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME,
1661 "%s: traffic %u, disable aggressive mode\n",
1662 __func__, wme->wme_hipri_traffic);
1663 wme->wme_flags &= ~WME_F_AGGRMODE;
1664 ieee80211_wme_updateparams(ic);
1665 wme->wme_hipri_traffic =
1666 wme->wme_hipri_switch_hysteresis;
1668 wme->wme_hipri_traffic = 0;
1670 if (wme->wme_hipri_traffic <=
1671 wme->wme_hipri_switch_thresh) {
1672 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME,
1673 "%s: traffic %u, enable aggressive mode\n",
1674 __func__, wme->wme_hipri_traffic);
1675 wme->wme_flags |= WME_F_AGGRMODE;
1676 ieee80211_wme_updateparams(ic);
1677 wme->wme_hipri_traffic = 0;
1679 wme->wme_hipri_traffic =
1680 wme->wme_hipri_switch_hysteresis;
1682 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) {
1683 (void) ieee80211_add_wme_param(bo->bo_wme, wme);
1684 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE;
1688 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/
1689 struct ieee80211_tim_ie *tie =
1690 (struct ieee80211_tim_ie *) bo->bo_tim;
1691 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) {
1692 u_int timlen, timoff, i;
1694 * ATIM/DTIM needs updating. If it fits in the
1695 * current space allocated then just copy in the
1696 * new bits. Otherwise we need to move any trailing
1697 * data to make room. Note that we know there is
1698 * contiguous space because ieee80211_beacon_allocate
1699 * insures there is space in the mbuf to write a
1700 * maximal-size virtual bitmap (based on ic_max_aid).
1703 * Calculate the bitmap size and offset, copy any
1704 * trailer out of the way, and then copy in the
1705 * new bitmap and update the information element.
1706 * Note that the tim bitmap must contain at least
1707 * one byte and any offset must be even.
1709 if (ic->ic_ps_pending != 0) {
1710 timoff = 128; /* impossibly large */
1711 for (i = 0; i < ic->ic_tim_len; i++)
1712 if (ic->ic_tim_bitmap[i]) {
1716 KASSERT(timoff != 128, ("tim bitmap empty!"));
1717 for (i = ic->ic_tim_len-1; i >= timoff; i--)
1718 if (ic->ic_tim_bitmap[i])
1720 timlen = 1 + (i - timoff);
1725 if (timlen != bo->bo_tim_len) {
1726 /* copy up/down trailer */
1727 int adjust = tie->tim_bitmap+timlen
1729 ovbcopy(bo->bo_trailer, bo->bo_trailer+adjust,
1730 bo->bo_trailer_len);
1731 bo->bo_trailer += adjust;
1732 bo->bo_wme += adjust;
1733 bo->bo_erp += adjust;
1734 bo->bo_tim_len = timlen;
1736 /* update information element */
1737 tie->tim_len = 3 + timlen;
1738 tie->tim_bitctl = timoff;
1741 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff,
1744 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE;
1746 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
1747 "%s: TIM updated, pending %u, off %u, len %u\n",
1748 __func__, ic->ic_ps_pending, timoff, timlen);
1750 /* count down DTIM period */
1751 if (tie->tim_count == 0)
1752 tie->tim_count = tie->tim_period - 1;
1755 /* update state for buffered multicast frames on DTIM */
1756 if (mcast && tie->tim_count == 0)
1757 tie->tim_bitctl |= 1;
1759 tie->tim_bitctl &= ~1;
1760 if (ic->ic_flags_ext & IEEE80211_FEXT_ERPUPDATE) {
1762 * ERP element needs updating.
1764 (void) ieee80211_add_erp(bo->bo_erp, ic);
1765 ic->ic_flags_ext &= ~IEEE80211_FEXT_ERPUPDATE;
1773 * Save an outbound packet for a node in power-save sleep state.
1774 * The new packet is placed on the node's saved queue, and the TIM
1775 * is changed, if necessary.
1778 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni,
1783 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer);
1785 if (IF_QFULL(&ni->ni_savedq)) {
1786 IF_DROP(&ni->ni_savedq);
1787 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1788 "[%6D] pwr save q overflow, drops %d (size %d)\n",
1789 ni->ni_macaddr, ":",
1790 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE);
1791 #ifdef IEEE80211_DEBUG
1792 if (ieee80211_msg_dumppkts(ic)) {
1793 ieee80211_dump_pkt(mtod(m, uint8_t *), m->m_len,
1801 * Tag the frame with it's expiry time and insert
1802 * it in the queue. The aging interval is 4 times
1803 * the listen interval specified by the station.
1804 * Frames that sit around too long are reclaimed
1805 * using this information.
1807 /* TU -> secs. XXX handle overflow? */
1808 age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
1809 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age);
1811 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
1812 "[%6D] save frame with age %d, %u now queued\n",
1813 ni->ni_macaddr, ":", age, qlen);
1816 ic->ic_set_tim(ni, 1);
1820 ieee80211_ack_rate(struct ieee80211_node *ni, uint8_t rate)
1822 const struct ieee80211_rateset *rs = &ni->ni_rates;
1823 uint8_t ack_rate = 0;
1824 enum ieee80211_modtype modtype;
1827 rate &= IEEE80211_RATE_VAL;
1829 modtype = ieee80211_rate2modtype(rate);
1831 for (i = 0; i < rs->rs_nrates; ++i) {
1832 uint8_t rate1 = IEEE80211_RS_RATE(rs, i);
1841 if ((rs->rs_rates[i] & IEEE80211_RATE_BASIC) &&
1842 ieee80211_rate2modtype(rate1) == modtype)
1876 panic("unsupported rate %d\n", rate);
1881 /* IEEE Std 802.11a-1999, page 9, table 79 */
1882 #define IEEE80211_OFDM_SYM_TIME 4
1883 #define IEEE80211_OFDM_PREAMBLE_TIME 16
1884 #define IEEE80211_OFDM_SIGNAL_TIME 4
1885 /* IEEE Std 802.11g-2003, page 44 */
1886 #define IEEE80211_OFDM_SIGNAL_EXT_TIME 6
1888 /* IEEE Std 802.11a-1999, page 7, figure 107 */
1889 #define IEEE80211_OFDM_PLCP_SERVICE_NBITS 16
1890 #define IEEE80211_OFDM_TAIL_NBITS 6
1892 #define IEEE80211_OFDM_NBITS(frmlen) \
1893 (IEEE80211_OFDM_PLCP_SERVICE_NBITS + \
1894 ((frmlen) * NBBY) + \
1895 IEEE80211_OFDM_TAIL_NBITS)
1897 #define IEEE80211_OFDM_NBITS_PER_SYM(kbps) \
1898 (((kbps) * IEEE80211_OFDM_SYM_TIME) / 1000)
1900 #define IEEE80211_OFDM_NSYMS(kbps, frmlen) \
1901 howmany(IEEE80211_OFDM_NBITS((frmlen)), \
1902 IEEE80211_OFDM_NBITS_PER_SYM((kbps)))
1904 #define IEEE80211_OFDM_TXTIME(kbps, frmlen) \
1905 (IEEE80211_OFDM_PREAMBLE_TIME + \
1906 IEEE80211_OFDM_SIGNAL_TIME + \
1907 (IEEE80211_OFDM_NSYMS((kbps), (frmlen)) * IEEE80211_OFDM_SYM_TIME))
1909 /* IEEE Std 802.11b-1999, page 28, subclause 18.3.4 */
1910 #define IEEE80211_CCK_PREAMBLE_LEN 144
1911 #define IEEE80211_CCK_PLCP_HDR_TIME 48
1912 #define IEEE80211_CCK_SHPREAMBLE_LEN 72
1913 #define IEEE80211_CCK_SHPLCP_HDR_TIME 24
1915 #define IEEE80211_CCK_NBITS(frmlen) ((frmlen) * NBBY)
1916 #define IEEE80211_CCK_TXTIME(kbps, frmlen) \
1917 (((IEEE80211_CCK_NBITS((frmlen)) * 1000) + (kbps) - 1) / (kbps))
1920 ieee80211_txtime(struct ieee80211_node *ni, u_int len, uint8_t rs_rate,
1923 struct ieee80211com *ic = ni->ni_ic;
1924 enum ieee80211_modtype modtype;
1928 rs_rate &= IEEE80211_RATE_VAL;
1930 rate = rs_rate * 500; /* ieee80211 rate -> kbps */
1932 modtype = ieee80211_rate2modtype(rs_rate);
1933 if (modtype == IEEE80211_MODTYPE_OFDM) {
1935 * IEEE Std 802.11a-1999, page 37, equation (29)
1936 * IEEE Std 802.11g-2003, page 44, equation (42)
1938 txtime = IEEE80211_OFDM_TXTIME(rate, len);
1939 if (ic->ic_curmode == IEEE80211_MODE_11G)
1940 txtime += IEEE80211_OFDM_SIGNAL_EXT_TIME;
1943 * IEEE Std 802.11b-1999, page 28, subclause 18.3.4
1944 * IEEE Std 802.11g-2003, page 45, equation (43)
1946 if (modtype == IEEE80211_MODTYPE_PBCC)
1948 txtime = IEEE80211_CCK_TXTIME(rate, len);
1951 * Short preamble is not applicable for DS 1Mbits/s
1953 if (rs_rate != 2 && (flags & IEEE80211_F_SHPREAMBLE)) {
1954 txtime += IEEE80211_CCK_SHPREAMBLE_LEN +
1955 IEEE80211_CCK_SHPLCP_HDR_TIME;
1957 txtime += IEEE80211_CCK_PREAMBLE_LEN +
1958 IEEE80211_CCK_PLCP_HDR_TIME;