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 1.16 2007/03/06 12:17:51 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;
385 /* XXX belongs in crypto code? */
386 needed_space += key->wk_cipher->ic_header;
389 * When crypto is being done in the host we must insure
390 * the data are writable for the cipher routines; clone
391 * a writable mbuf chain.
392 * XXX handle SWMIC specially
394 if (key->wk_flags & (IEEE80211_KEY_SWCRYPT|IEEE80211_KEY_SWMIC)) {
395 m = ieee80211_mbuf_clone(m, MB_DONTWAIT);
397 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
398 "%s: cannot get writable mbuf\n", __func__);
399 ic->ic_stats.is_tx_nobuf++; /* XXX new stat */
405 * We know we are called just before stripping an Ethernet
406 * header and prepending an LLC header. This means we know
408 * sizeof(struct ether_header) - sizeof(struct llc)
409 * bytes recovered to which we need additional space for the
410 * 802.11 header and any crypto header.
412 /* XXX check trailing space and copy instead? */
413 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
414 struct mbuf *n = m_gethdr(MB_DONTWAIT, m->m_type);
416 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
417 "%s: cannot expand storage\n", __func__);
418 ic->ic_stats.is_tx_nobuf++;
422 KASSERT(needed_space <= MHLEN,
423 ("not enough room, need %u got %zu\n", needed_space, MHLEN));
425 * Setup new mbuf to have leading space to prepend the
426 * 802.11 header and any crypto header bits that are
427 * required (the latter are added when the driver calls
428 * back to ieee80211_crypto_encap to do crypto encapsulation).
430 /* NB: must be first 'cuz it clobbers m_data */
432 n->m_len = 0; /* NB: m_gethdr does not set */
433 n->m_data += needed_space;
435 * Pull up Ethernet header to create the expected layout.
436 * We could use m_pullup but that's overkill (i.e. we don't
437 * need the actual data) and it cannot fail so do it inline
440 /* NB: struct ether_header is known to be contiguous */
441 n->m_len += sizeof(struct ether_header);
442 m->m_len -= sizeof(struct ether_header);
443 m->m_data += sizeof(struct ether_header);
445 * Replace the head of the chain.
451 #undef TO_BE_RECLAIMED
454 #define KEY_UNDEFINED(k) ((k).wk_cipher == &ieee80211_cipher_none)
456 * Return the transmit key to use in sending a unicast frame.
457 * If a unicast key is set we use that. When no unicast key is set
458 * we fall back to the default transmit key.
460 static __inline struct ieee80211_key *
461 ieee80211_crypto_getucastkey(struct ieee80211com *ic, struct ieee80211_node *ni)
463 if (KEY_UNDEFINED(ni->ni_ucastkey)) {
464 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE ||
465 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey]))
467 return &ic->ic_nw_keys[ic->ic_def_txkey];
469 return &ni->ni_ucastkey;
474 * Return the transmit key to use in sending a multicast frame.
475 * Multicast traffic always uses the group key which is installed as
476 * the default tx key.
478 static __inline struct ieee80211_key *
479 ieee80211_crypto_getmcastkey(struct ieee80211com *ic, struct ieee80211_node *ni)
481 if (ic->ic_def_txkey == IEEE80211_KEYIX_NONE ||
482 KEY_UNDEFINED(ic->ic_nw_keys[ic->ic_def_txkey]))
484 return &ic->ic_nw_keys[ic->ic_def_txkey];
488 * Encapsulate an outbound data frame. The mbuf chain is updated.
489 * If an error is encountered NULL is returned. The caller is required
490 * to provide a node reference and pullup the ethernet header in the
494 ieee80211_encap(struct ieee80211com *ic, struct mbuf *m,
495 struct ieee80211_node *ni)
497 struct ether_header eh;
498 struct ieee80211_frame *wh;
499 struct ieee80211_key *key;
501 int hdrsize, datalen, addqos;
503 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
504 memcpy(&eh, mtod(m, caddr_t), sizeof(struct ether_header));
507 * Insure space for additional headers. First identify
508 * transmit key to use in calculating any buffer adjustments
509 * required. This is also used below to do privacy
510 * encapsulation work. Then calculate the 802.11 header
511 * size and any padding required by the driver.
513 * Note key may be NULL if we fall back to the default
514 * transmit key and that is not set. In that case the
515 * buffer may not be expanded as needed by the cipher
516 * routines, but they will/should discard it.
518 if (ic->ic_flags & IEEE80211_F_PRIVACY) {
519 if (ic->ic_opmode == IEEE80211_M_STA ||
520 !IEEE80211_IS_MULTICAST(eh.ether_dhost))
521 key = ieee80211_crypto_getucastkey(ic, ni);
523 key = ieee80211_crypto_getmcastkey(ic, ni);
524 if (key == NULL && eh.ether_type != htons(ETHERTYPE_PAE)) {
525 IEEE80211_DPRINTF(ic, IEEE80211_MSG_CRYPTO,
526 "[%6D] no default transmit key (%s) deftxkey %u\n",
527 eh.ether_dhost, ":", __func__,
529 ic->ic_stats.is_tx_nodefkey++;
533 /* XXX 4-address format */
535 * XXX Some ap's don't handle QoS-encapsulated EAPOL
536 * frames so suppress use. This may be an issue if other
537 * ap's require all data frames to be QoS-encapsulated
538 * once negotiated in which case we'll need to make this
541 addqos = (ni->ni_flags & IEEE80211_NODE_QOS) &&
542 eh.ether_type != htons(ETHERTYPE_PAE);
544 hdrsize = sizeof(struct ieee80211_qosframe);
546 hdrsize = sizeof(struct ieee80211_frame);
547 if (ic->ic_flags & IEEE80211_F_DATAPAD)
548 hdrsize = roundup(hdrsize, sizeof(uint32_t));
549 m = ieee80211_mbuf_adjust(ic, hdrsize, key, m);
551 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
555 /* NB: this could be optimized because of ieee80211_mbuf_adjust */
556 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
557 llc = mtod(m, struct llc *);
558 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
559 llc->llc_control = LLC_UI;
560 llc->llc_snap.org_code[0] = 0;
561 llc->llc_snap.org_code[1] = 0;
562 llc->llc_snap.org_code[2] = 0;
563 llc->llc_snap.ether_type = eh.ether_type;
564 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
566 M_PREPEND(m, hdrsize, MB_DONTWAIT);
568 ic->ic_stats.is_tx_nobuf++;
571 wh = mtod(m, struct ieee80211_frame *);
572 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
573 *(uint16_t *)wh->i_dur = 0;
574 switch (ic->ic_opmode) {
575 case IEEE80211_M_STA:
576 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
577 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
578 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
579 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
581 case IEEE80211_M_IBSS:
582 case IEEE80211_M_AHDEMO:
583 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
584 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
585 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
587 * NB: always use the bssid from ic_bss as the
588 * neighbor's may be stale after an ibss merge
590 IEEE80211_ADDR_COPY(wh->i_addr3, ic->ic_bss->ni_bssid);
592 case IEEE80211_M_HOSTAP:
593 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
594 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
595 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
596 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
598 case IEEE80211_M_MONITOR:
601 if (m->m_flags & M_MORE_DATA)
602 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
604 struct ieee80211_qosframe *qwh =
605 (struct ieee80211_qosframe *) wh;
609 /* map from access class/queue to 11e header priorty value */
610 tid = WME_AC_TO_TID(ac);
611 qwh->i_qos[0] = tid & IEEE80211_QOS_TID;
612 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
613 qwh->i_qos[0] |= 1 << IEEE80211_QOS_ACKPOLICY_S;
615 qwh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
617 *(uint16_t *)wh->i_seq =
618 htole16(ni->ni_txseqs[tid] << IEEE80211_SEQ_SEQ_SHIFT);
619 ni->ni_txseqs[tid]++;
621 *(uint16_t *)wh->i_seq =
622 htole16(ni->ni_txseqs[0] << IEEE80211_SEQ_SEQ_SHIFT);
627 * IEEE 802.1X: send EAPOL frames always in the clear.
628 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
630 if (eh.ether_type != htons(ETHERTYPE_PAE) ||
631 ((ic->ic_flags & IEEE80211_F_WPA) &&
632 (ic->ic_opmode == IEEE80211_M_STA ?
633 !KEY_UNDEFINED(*key) : !KEY_UNDEFINED(ni->ni_ucastkey)))) {
634 wh->i_fc[1] |= IEEE80211_FC1_WEP;
635 /* XXX do fragmentation */
636 if (!ieee80211_crypto_enmic(ic, key, m, 0)) {
637 IEEE80211_DPRINTF(ic, IEEE80211_MSG_OUTPUT,
638 "[%6D] enmic failed, discard frame\n",
639 eh.ether_dhost, ":");
640 ic->ic_stats.is_crypto_enmicfail++;
646 IEEE80211_NODE_STAT(ni, tx_data);
647 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
648 IEEE80211_NODE_STAT(ni, tx_mcast);
650 IEEE80211_NODE_STAT(ni, tx_ucast);
651 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
661 * Add a supported rates element id to a frame.
664 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
668 *frm++ = IEEE80211_ELEMID_RATES;
669 nrates = rs->rs_nrates;
670 if (nrates > IEEE80211_RATE_SIZE)
671 nrates = IEEE80211_RATE_SIZE;
673 memcpy(frm, rs->rs_rates, nrates);
678 * Add an extended supported rates element id to a frame.
681 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
684 * Add an extended supported rates element if operating in 11g mode.
686 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
687 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
688 *frm++ = IEEE80211_ELEMID_XRATES;
690 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
697 * Add an ssid elemet to a frame.
700 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
702 *frm++ = IEEE80211_ELEMID_SSID;
704 memcpy(frm, ssid, len);
709 * Add an erp element to a frame.
712 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
716 *frm++ = IEEE80211_ELEMID_ERP;
719 if (ic->ic_nonerpsta != 0)
720 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
721 if (ic->ic_flags & IEEE80211_F_USEPROT)
722 erp |= IEEE80211_ERP_USE_PROTECTION;
723 if (ic->ic_flags & IEEE80211_F_USEBARKER)
724 erp |= IEEE80211_ERP_LONG_PREAMBLE;
730 ieee80211_setup_wpa_ie(struct ieee80211com *ic, uint8_t *ie)
732 #define WPA_OUI_BYTES 0x00, 0x50, 0xf2
733 #define ADDSHORT(frm, v) do { \
734 frm[0] = (v) & 0xff; \
738 #define ADDSELECTOR(frm, sel) do { \
739 memcpy(frm, sel, 4); \
742 static const uint8_t oui[4] = { WPA_OUI_BYTES, WPA_OUI_TYPE };
743 static const uint8_t cipher_suite[][4] = {
744 { WPA_OUI_BYTES, WPA_CSE_WEP40 }, /* NB: 40-bit */
745 { WPA_OUI_BYTES, WPA_CSE_TKIP },
746 { 0x00, 0x00, 0x00, 0x00 }, /* XXX WRAP */
747 { WPA_OUI_BYTES, WPA_CSE_CCMP },
748 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */
749 { WPA_OUI_BYTES, WPA_CSE_NULL },
751 static const uint8_t wep104_suite[4] =
752 { WPA_OUI_BYTES, WPA_CSE_WEP104 };
753 static const uint8_t key_mgt_unspec[4] =
754 { WPA_OUI_BYTES, WPA_ASE_8021X_UNSPEC };
755 static const uint8_t key_mgt_psk[4] =
756 { WPA_OUI_BYTES, WPA_ASE_8021X_PSK };
757 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn;
761 *frm++ = IEEE80211_ELEMID_VENDOR;
762 *frm++ = 0; /* length filled in below */
763 memcpy(frm, oui, sizeof(oui)); /* WPA OUI */
765 ADDSHORT(frm, WPA_VERSION);
767 /* XXX filter out CKIP */
769 /* multicast cipher */
770 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP &&
771 rsn->rsn_mcastkeylen >= 13)
772 ADDSELECTOR(frm, wep104_suite);
774 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]);
776 /* unicast cipher list */
778 ADDSHORT(frm, 0); /* selector count */
779 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) {
781 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]);
783 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) {
785 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]);
788 /* authenticator selector list */
790 ADDSHORT(frm, 0); /* selector count */
791 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) {
793 ADDSELECTOR(frm, key_mgt_unspec);
795 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) {
797 ADDSELECTOR(frm, key_mgt_psk);
800 /* optional capabilities */
801 if (rsn->rsn_caps != 0 && rsn->rsn_caps != RSN_CAP_PREAUTH)
802 ADDSHORT(frm, rsn->rsn_caps);
804 /* calculate element length */
805 ie[1] = frm - ie - 2;
806 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa),
807 ("WPA IE too big, %u > %zu",
808 ie[1]+2, sizeof(struct ieee80211_ie_wpa)));
816 ieee80211_setup_rsn_ie(struct ieee80211com *ic, uint8_t *ie)
818 #define RSN_OUI_BYTES 0x00, 0x0f, 0xac
819 #define ADDSHORT(frm, v) do { \
820 frm[0] = (v) & 0xff; \
824 #define ADDSELECTOR(frm, sel) do { \
825 memcpy(frm, sel, 4); \
828 static const uint8_t cipher_suite[][4] = {
829 { RSN_OUI_BYTES, RSN_CSE_WEP40 }, /* NB: 40-bit */
830 { RSN_OUI_BYTES, RSN_CSE_TKIP },
831 { RSN_OUI_BYTES, RSN_CSE_WRAP },
832 { RSN_OUI_BYTES, RSN_CSE_CCMP },
833 { 0x00, 0x00, 0x00, 0x00 }, /* XXX CKIP */
834 { RSN_OUI_BYTES, RSN_CSE_NULL },
836 static const uint8_t wep104_suite[4] =
837 { RSN_OUI_BYTES, RSN_CSE_WEP104 };
838 static const uint8_t key_mgt_unspec[4] =
839 { RSN_OUI_BYTES, RSN_ASE_8021X_UNSPEC };
840 static const uint8_t key_mgt_psk[4] =
841 { RSN_OUI_BYTES, RSN_ASE_8021X_PSK };
842 const struct ieee80211_rsnparms *rsn = &ic->ic_bss->ni_rsn;
846 *frm++ = IEEE80211_ELEMID_RSN;
847 *frm++ = 0; /* length filled in below */
848 ADDSHORT(frm, RSN_VERSION);
850 /* XXX filter out CKIP */
852 /* multicast cipher */
853 if (rsn->rsn_mcastcipher == IEEE80211_CIPHER_WEP &&
854 rsn->rsn_mcastkeylen >= 13)
855 ADDSELECTOR(frm, wep104_suite);
857 ADDSELECTOR(frm, cipher_suite[rsn->rsn_mcastcipher]);
859 /* unicast cipher list */
861 ADDSHORT(frm, 0); /* selector count */
862 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_AES_CCM)) {
864 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_AES_CCM]);
866 if (rsn->rsn_ucastcipherset & (1<<IEEE80211_CIPHER_TKIP)) {
868 ADDSELECTOR(frm, cipher_suite[IEEE80211_CIPHER_TKIP]);
871 /* authenticator selector list */
873 ADDSHORT(frm, 0); /* selector count */
874 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_UNSPEC) {
876 ADDSELECTOR(frm, key_mgt_unspec);
878 if (rsn->rsn_keymgmtset & WPA_ASE_8021X_PSK) {
880 ADDSELECTOR(frm, key_mgt_psk);
883 /* optional capabilities */
884 ADDSHORT(frm, rsn->rsn_caps);
887 /* calculate element length */
888 ie[1] = frm - ie - 2;
889 KASSERT(ie[1]+2 <= sizeof(struct ieee80211_ie_wpa),
890 ("RSN IE too big, %u > %zu",
891 ie[1]+2, sizeof(struct ieee80211_ie_wpa)));
899 * Add a WPA/RSN element to a frame.
902 ieee80211_add_wpa(uint8_t *frm, struct ieee80211com *ic)
905 KASSERT(ic->ic_flags & IEEE80211_F_WPA, ("no WPA/RSN!"));
906 if (ic->ic_flags & IEEE80211_F_WPA2)
907 frm = ieee80211_setup_rsn_ie(ic, frm);
908 if (ic->ic_flags & IEEE80211_F_WPA1)
909 frm = ieee80211_setup_wpa_ie(ic, frm);
913 #define WME_OUI_BYTES 0x00, 0x50, 0xf2
915 * Add a WME information element to a frame.
918 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
920 static const struct ieee80211_wme_info info = {
921 .wme_id = IEEE80211_ELEMID_VENDOR,
922 .wme_len = sizeof(struct ieee80211_wme_info) - 2,
923 .wme_oui = { WME_OUI_BYTES },
924 .wme_type = WME_OUI_TYPE,
925 .wme_subtype = WME_INFO_OUI_SUBTYPE,
926 .wme_version = WME_VERSION,
929 memcpy(frm, &info, sizeof(info));
930 return frm + sizeof(info);
934 * Add a WME parameters element to a frame.
937 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
939 #define SM(_v, _f) (((_v) << _f##_S) & _f)
940 #define ADDSHORT(frm, v) do { \
941 frm[0] = (v) & 0xff; \
945 /* NB: this works 'cuz a param has an info at the front */
946 static const struct ieee80211_wme_info param = {
947 .wme_id = IEEE80211_ELEMID_VENDOR,
948 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
949 .wme_oui = { WME_OUI_BYTES },
950 .wme_type = WME_OUI_TYPE,
951 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
952 .wme_version = WME_VERSION,
956 memcpy(frm, ¶m, sizeof(param));
957 frm += __offsetof(struct ieee80211_wme_info, wme_info);
958 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */
959 *frm++ = 0; /* reserved field */
960 for (i = 0; i < WME_NUM_AC; i++) {
961 const struct wmeParams *ac =
962 &wme->wme_bssChanParams.cap_wmeParams[i];
963 *frm++ = SM(i, WME_PARAM_ACI)
964 | SM(ac->wmep_acm, WME_PARAM_ACM)
965 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
967 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
968 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
970 ADDSHORT(frm, ac->wmep_txopLimit);
979 * Send a probe request frame with the specified ssid
980 * and any optional information element data.
983 ieee80211_send_probereq(struct ieee80211_node *ni,
984 const uint8_t sa[IEEE80211_ADDR_LEN],
985 const uint8_t da[IEEE80211_ADDR_LEN],
986 const uint8_t bssid[IEEE80211_ADDR_LEN],
987 const uint8_t *ssid, size_t ssidlen,
988 const void *optie, size_t optielen)
990 struct ieee80211com *ic = ni->ni_ic;
991 struct ifnet *ifp = ic->ic_ifp;
992 enum ieee80211_phymode mode;
993 struct ieee80211_frame *wh;
994 struct ieee80211_rateset rs;
999 * Hold a reference on the node so it doesn't go away until after
1000 * the xmit is complete all the way in the driver. On error we
1001 * will remove our reference.
1003 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1004 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n",
1006 ni, ni->ni_macaddr, ":",
1007 ieee80211_node_refcnt(ni) + 1);
1008 ieee80211_ref_node(ni);
1011 * prreq frame format
1013 * [tlv] supported rates
1014 * [tlv] extended supported rates
1015 * [tlv] user-specified ie's
1017 m = ieee80211_getmgtframe(&frm,
1018 2 + IEEE80211_NWID_LEN
1019 + 2 + IEEE80211_RATE_SIZE
1020 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1021 + (optie != NULL ? optielen : 0)
1024 ic->ic_stats.is_tx_nobuf++;
1025 ieee80211_free_node(ni);
1029 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
1033 * Clear basic rates.
1035 * Though according to 802.11 standard: MSB of each supported rate
1036 * octet in (Extended) Supported Rates ie of probe requests should
1037 * be ignored, some HostAP implementations still check it ...
1039 mode = ieee80211_chan2mode(ic, ic->ic_curchan);
1040 rs = ic->ic_sup_rates[mode];
1041 ieee80211_set_basicrates(&rs, IEEE80211_MODE_AUTO, 0);
1042 frm = ieee80211_add_rates(frm, &rs);
1043 frm = ieee80211_add_xrates(frm, &rs);
1045 if (optie != NULL) {
1046 memcpy(frm, optie, optielen);
1049 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1051 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT);
1054 KASSERT(m->m_pkthdr.rcvif == NULL, ("rcvif not null"));
1055 m->m_pkthdr.rcvif = (void *)ni;
1057 wh = mtod(m, struct ieee80211_frame *);
1058 ieee80211_send_setup(ic, ni, wh,
1059 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
1061 /* XXX power management? */
1063 IEEE80211_NODE_STAT(ni, tx_probereq);
1064 IEEE80211_NODE_STAT(ni, tx_mgmt);
1066 IEEE80211_DPRINTF(ic, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
1067 "[%6D] send probe req on channel %u\n",
1069 ieee80211_chan2ieee(ic, ic->ic_curchan));
1071 IF_ENQUEUE(&ic->ic_mgtq, m);
1077 * Calculate capability information for mgt frames.
1080 getcapinfo(struct ieee80211com *ic, struct ieee80211_channel *chan)
1084 KASSERT(ic->ic_opmode != IEEE80211_M_STA, ("station mode"));
1086 if (ic->ic_opmode == IEEE80211_M_HOSTAP)
1087 capinfo = IEEE80211_CAPINFO_ESS;
1088 else if (ic->ic_opmode == IEEE80211_M_IBSS)
1089 capinfo = IEEE80211_CAPINFO_IBSS;
1092 if (ic->ic_flags & IEEE80211_F_PRIVACY)
1093 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1094 if (IEEE80211_IS_CHAN_2GHZ(chan)) {
1095 if (ic->ic_flags & IEEE80211_F_SHPREAMBLE)
1096 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1097 if (ic->ic_caps_ext & IEEE80211_CEXT_PBCC)
1098 capinfo |= IEEE80211_CAPINFO_PBCC;
1100 if (ic->ic_flags & IEEE80211_F_SHSLOT)
1101 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1105 static struct mbuf *
1106 _ieee80211_probe_resp_alloc(struct ieee80211com *ic, struct ieee80211_node *ni)
1108 const struct ieee80211_rateset *rs;
1115 * probe response frame format
1117 * [2] beacon interval
1118 * [2] cabability information
1120 * [tlv] supported rates
1121 * [tlv] parameter set (FH/DS)
1122 * [4] parameter set (IBSS)
1123 * [tlv] extended rate phy (ERP)
1124 * [tlv] extended supported rates
1126 * [tlv] WME (optional)
1128 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO);
1129 rs = &ic->ic_sup_rates[ic->ic_curmode];
1130 pktlen = 8 /* time stamp */
1131 + sizeof(uint16_t) /* beacon interval */
1132 + sizeof(uint16_t) /* capabilities */
1133 + 2 + ni->ni_esslen /* ssid */
1134 + 2 + IEEE80211_RATE_SIZE /* supported rates */
1135 + 2 + 5 /* max(5,1) */ /* DS/FH parameters */
1136 + 2 + 2 /* IBSS parameters */
1138 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1139 /* XXX !WPA1+WPA2 fits w/o a cluster */
1140 + (ic->ic_flags & IEEE80211_F_WPA ? /* WPA 1+2 */
1141 2*sizeof(struct ieee80211_ie_wpa) : 0)
1142 + sizeof(struct ieee80211_wme_param); /* WME */
1144 m = ieee80211_getmgtframe(&frm, pktlen);
1146 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1147 "%s: cannot get buf; size %u\n", __func__, pktlen);
1148 ic->ic_stats.is_tx_nobuf++;
1152 memset(frm, 0, 8); /* timestamp should be filled later */
1154 *(uint16_t *)frm = htole16(ni->ni_intval);
1156 capinfo = getcapinfo(ic, ni->ni_chan);
1157 *(uint16_t *)frm = htole16(capinfo);
1160 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
1161 frm = ieee80211_add_rates(frm, rs);
1163 if (ic->ic_phytype == IEEE80211_T_FH) {
1164 *frm++ = IEEE80211_ELEMID_FHPARMS;
1166 *frm++ = ni->ni_fhdwell & 0x00ff;
1167 *frm++ = (ni->ni_fhdwell >> 8) & 0x00ff;
1168 *frm++ = IEEE80211_FH_CHANSET(
1169 ieee80211_chan2ieee(ic, ni->ni_chan));
1170 *frm++ = IEEE80211_FH_CHANPAT(
1171 ieee80211_chan2ieee(ic, ni->ni_chan));
1172 *frm++ = ni->ni_fhindex;
1174 *frm++ = IEEE80211_ELEMID_DSPARMS;
1176 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
1179 if (ic->ic_opmode == IEEE80211_M_IBSS) {
1180 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
1182 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
1184 if (ic->ic_flags & IEEE80211_F_WPA)
1185 frm = ieee80211_add_wpa(frm, ic);
1186 if (ic->ic_curmode == IEEE80211_MODE_11G)
1187 frm = ieee80211_add_erp(frm, ic);
1188 frm = ieee80211_add_xrates(frm, rs);
1189 if (ic->ic_flags & IEEE80211_F_WME)
1190 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
1191 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1192 KKASSERT(m->m_len <= pktlen);
1198 * Send a management frame. The node is for the destination (or ic_bss
1199 * when in station mode). Nodes other than ic_bss have their reference
1200 * count bumped to reflect our use for an indeterminant time.
1203 ieee80211_send_mgmt(struct ieee80211com *ic, struct ieee80211_node *ni,
1206 #define senderr(_x, _v) do { ic->ic_stats._v++; ret = _x; goto bad; } while (0)
1210 int has_challenge, is_shared_key, ret, timer, status, encrypt;
1211 const struct ieee80211_rateset *rs;
1213 KASSERT(ni != NULL, ("null node"));
1216 * Hold a reference on the node so it doesn't go away until after
1217 * the xmit is complete all the way in the driver. On error we
1218 * will remove our reference.
1220 IEEE80211_DPRINTF(ic, IEEE80211_MSG_NODE,
1221 "ieee80211_ref_node (%s:%u) %p<%6D> refcnt %d\n",
1223 ni, ni->ni_macaddr, ":",
1224 ieee80211_node_refcnt(ni) + 1);
1225 ieee80211_ref_node(ni);
1230 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
1231 m = _ieee80211_probe_resp_alloc(ic, ic->ic_bss);
1233 /* NB: Statistics have been updated. */
1239 case IEEE80211_FC0_SUBTYPE_AUTH:
1242 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
1243 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
1244 ni->ni_challenge != NULL);
1247 * Deduce whether we're doing open authentication or
1248 * shared key authentication. We do the latter if
1249 * we're in the middle of a shared key authentication
1250 * handshake or if we're initiating an authentication
1251 * request and configured to use shared key.
1253 is_shared_key = has_challenge ||
1254 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
1255 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
1256 ic->ic_bss->ni_authmode == IEEE80211_AUTH_SHARED);
1258 m = ieee80211_getmgtframe(&frm,
1259 3 * sizeof(uint16_t)
1260 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
1261 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
1264 senderr(ENOMEM, is_tx_nobuf);
1266 ((uint16_t *)frm)[0] =
1267 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
1268 : htole16(IEEE80211_AUTH_ALG_OPEN);
1269 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
1270 ((uint16_t *)frm)[2] = htole16(status);/* status */
1272 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
1273 ((uint16_t *)frm)[3] =
1274 htole16((IEEE80211_CHALLENGE_LEN << 8) |
1275 IEEE80211_ELEMID_CHALLENGE);
1276 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
1277 IEEE80211_CHALLENGE_LEN);
1278 m->m_pkthdr.len = m->m_len =
1279 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
1280 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
1281 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
1282 "[%6D] request encrypt frame (%s)\n",
1283 ni->ni_macaddr, ":", __func__);
1284 encrypt = 1; /* WEP-encrypt, please */
1287 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
1289 /* XXX not right for shared key */
1290 if (status == IEEE80211_STATUS_SUCCESS)
1291 IEEE80211_NODE_STAT(ni, tx_auth);
1293 IEEE80211_NODE_STAT(ni, tx_auth_fail);
1295 if (ic->ic_opmode == IEEE80211_M_STA)
1296 timer = IEEE80211_TRANS_WAIT;
1299 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1300 IEEE80211_DPRINTF(ic, IEEE80211_MSG_AUTH,
1301 "[%6D] send station deauthenticate (reason %d)\n",
1302 ni->ni_macaddr, ":", arg);
1303 m = ieee80211_getmgtframe(&frm, sizeof(uint16_t));
1305 senderr(ENOMEM, is_tx_nobuf);
1306 *(uint16_t *)frm = htole16(arg); /* reason */
1307 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
1309 IEEE80211_NODE_STAT(ni, tx_deauth);
1310 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
1312 ieee80211_node_unauthorize(ni); /* port closed */
1315 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1316 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
1318 * asreq frame format
1319 * [2] capability information
1320 * [2] listen interval
1321 * [6*] current AP address (reassoc only)
1323 * [tlv] supported rates
1324 * [tlv] extended supported rates
1326 * [tlv] user-specified ie's
1328 m = ieee80211_getmgtframe(&frm,
1331 + IEEE80211_ADDR_LEN
1332 + 2 + IEEE80211_NWID_LEN
1333 + 2 + IEEE80211_RATE_SIZE
1334 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1335 + sizeof(struct ieee80211_wme_info)
1336 + (ic->ic_opt_ie != NULL ? ic->ic_opt_ie_len : 0)
1339 senderr(ENOMEM, is_tx_nobuf);
1341 KASSERT(ic->ic_opmode == IEEE80211_M_STA,
1342 ("wrong mode %u", ic->ic_opmode));
1343 capinfo = IEEE80211_CAPINFO_ESS;
1344 if (ic->ic_flags & IEEE80211_F_PRIVACY)
1345 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1347 * NB: Some 11a AP's reject the request when
1348 * short premable or PBCC modulation is set.
1350 if (IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan)) {
1351 if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
1352 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1353 if (ic->ic_caps_ext & IEEE80211_CEXT_PBCC)
1354 capinfo |= IEEE80211_CAPINFO_PBCC;
1356 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME) &&
1357 (ic->ic_caps & IEEE80211_C_SHSLOT))
1358 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1359 *(uint16_t *)frm = htole16(capinfo);
1362 KKASSERT(ic->ic_bss->ni_intval != 0);
1363 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
1364 ic->ic_bss->ni_intval));
1367 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
1368 IEEE80211_ADDR_COPY(frm, ic->ic_bss->ni_bssid);
1369 frm += IEEE80211_ADDR_LEN;
1372 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
1374 rs = &ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)];
1375 frm = ieee80211_add_rates(frm, rs);
1376 frm = ieee80211_add_xrates(frm, rs);
1378 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL)
1379 frm = ieee80211_add_wme_info(frm, &ic->ic_wme);
1380 if (ic->ic_opt_ie != NULL) {
1381 memcpy(frm, ic->ic_opt_ie, ic->ic_opt_ie_len);
1382 frm += ic->ic_opt_ie_len;
1384 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1386 timer = IEEE80211_TRANS_WAIT;
1389 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
1390 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
1392 * asreq frame format
1393 * [2] capability information
1395 * [2] association ID
1396 * [tlv] supported rates
1397 * [tlv] extended supported rates
1398 * [tlv] WME (if enabled and STA enabled)
1400 m = ieee80211_getmgtframe(&frm,
1404 + 2 + IEEE80211_RATE_SIZE
1405 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1406 + sizeof(struct ieee80211_wme_param)
1409 senderr(ENOMEM, is_tx_nobuf);
1411 capinfo = getcapinfo(ic, ic->ic_curchan);
1412 *(uint16_t *)frm = htole16(capinfo);
1415 *(uint16_t *)frm = htole16(arg); /* status */
1418 if (arg == IEEE80211_STATUS_SUCCESS) {
1419 *(uint16_t *)frm = htole16(ni->ni_associd);
1420 IEEE80211_NODE_STAT(ni, tx_assoc);
1422 IEEE80211_NODE_STAT(ni, tx_assoc_fail);
1425 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO);
1426 rs = &ic->ic_sup_rates[ic->ic_curmode];
1427 frm = ieee80211_add_rates(frm, rs);
1428 frm = ieee80211_add_xrates(frm, rs);
1429 if ((ic->ic_flags & IEEE80211_F_WME) && ni->ni_wme_ie != NULL)
1430 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
1431 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1434 case IEEE80211_FC0_SUBTYPE_DISASSOC:
1435 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ASSOC,
1436 "[%6D] send station disassociate (reason %d)\n",
1437 ni->ni_macaddr, ":", arg);
1438 m = ieee80211_getmgtframe(&frm, sizeof(uint16_t));
1440 senderr(ENOMEM, is_tx_nobuf);
1441 *(uint16_t *)frm = htole16(arg); /* reason */
1442 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
1444 IEEE80211_NODE_STAT(ni, tx_disassoc);
1445 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
1449 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1450 "[%6D] invalid mgmt frame type %u\n",
1451 ni->ni_macaddr, ":", type);
1452 senderr(EINVAL, is_tx_unknownmgt);
1455 ret = ieee80211_mgmt_output(ic, ni, m, type, timer, encrypt);
1458 ieee80211_free_node(ni);
1465 * Allocate a probe response frame and fillin the appropriate bits.
1468 ieee80211_probe_resp_alloc(struct ieee80211com *ic, struct ieee80211_node *ni)
1470 struct ieee80211_frame *wh;
1473 m = _ieee80211_probe_resp_alloc(ic, ni);
1477 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT);
1478 KASSERT(m != NULL, ("no space for 802.11 header?"));
1480 wh = mtod(m, struct ieee80211_frame *);
1481 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
1482 IEEE80211_FC0_SUBTYPE_PROBE_RESP;
1483 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1484 *(uint16_t *)wh->i_dur = 0;
1485 bzero(wh->i_addr1, sizeof(wh->i_addr1));
1486 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr);
1487 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
1488 *(uint16_t *)wh->i_seq = 0;
1494 * Allocate a beacon frame and fillin the appropriate bits.
1497 ieee80211_beacon_alloc(struct ieee80211com *ic, struct ieee80211_node *ni,
1498 struct ieee80211_beacon_offsets *bo)
1500 struct ifnet *ifp = ic->ic_ifp;
1501 struct ieee80211_frame *wh;
1504 uint8_t *frm, *efrm;
1506 const struct ieee80211_rateset *rs;
1509 * beacon frame format
1511 * [2] beacon interval
1512 * [2] cabability information
1514 * [tlv] supported rates
1515 * [3] parameter set (DS)
1516 * [tlv] parameter set (IBSS/TIM)
1517 * [tlv] extended rate phy (ERP)
1518 * [tlv] extended supported rates
1519 * [tlv] WME parameters
1520 * [tlv] WPA/RSN parameters
1521 * XXX Vendor-specific OIDs (e.g. Atheros)
1522 * NB: we allocate the max space required for the TIM bitmap.
1524 KKASSERT(ic->ic_curmode != IEEE80211_MODE_AUTO);
1525 rs = &ic->ic_sup_rates[ic->ic_curmode];
1526 pktlen = 8 /* time stamp */
1527 + sizeof(uint16_t) /* beacon interval */
1528 + sizeof(uint16_t) /* capabilities */
1529 + 2 + ni->ni_esslen /* ssid */
1530 + 2 + IEEE80211_RATE_SIZE /* supported rates */
1531 + 2 + 1 /* DS parameters */
1532 + 2 + 4 + ic->ic_tim_len /* DTIM/IBSSPARMS */
1534 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1535 + (ic->ic_caps & IEEE80211_C_WME ? /* WME */
1536 sizeof(struct ieee80211_wme_param) : 0)
1537 + (ic->ic_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
1538 2*sizeof(struct ieee80211_ie_wpa) : 0)
1540 m = ieee80211_getmgtframe(&frm, pktlen);
1542 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1543 "%s: cannot get buf; size %u\n", __func__, pktlen);
1544 ic->ic_stats.is_tx_nobuf++;
1548 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */
1550 *(uint16_t *)frm = htole16(ni->ni_intval);
1552 capinfo = getcapinfo(ic, ni->ni_chan);
1553 bo->bo_caps = (uint16_t *)frm;
1554 *(uint16_t *)frm = htole16(capinfo);
1556 *frm++ = IEEE80211_ELEMID_SSID;
1557 if ((ic->ic_flags & IEEE80211_F_HIDESSID) == 0) {
1558 *frm++ = ni->ni_esslen;
1559 memcpy(frm, ni->ni_essid, ni->ni_esslen);
1560 frm += ni->ni_esslen;
1563 frm = ieee80211_add_rates(frm, rs);
1564 if (ic->ic_curmode != IEEE80211_MODE_FH) {
1565 *frm++ = IEEE80211_ELEMID_DSPARMS;
1567 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
1570 if (ic->ic_opmode == IEEE80211_M_IBSS) {
1571 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
1573 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
1575 } else if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
1576 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
1578 tie->tim_ie = IEEE80211_ELEMID_TIM;
1579 tie->tim_len = 4; /* length */
1580 tie->tim_count = 0; /* DTIM count */
1581 tie->tim_period = ic->ic_dtim_period; /* DTIM period */
1582 tie->tim_bitctl = 0; /* bitmap control */
1583 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
1584 frm += sizeof(struct ieee80211_tim_ie);
1587 bo->bo_trailer = frm;
1588 if (ic->ic_flags & IEEE80211_F_WME) {
1590 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
1591 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE;
1593 if (ic->ic_flags & IEEE80211_F_WPA)
1594 frm = ieee80211_add_wpa(frm, ic);
1595 if (ic->ic_curmode == IEEE80211_MODE_11G) {
1597 frm = ieee80211_add_erp(frm, ic);
1599 efrm = ieee80211_add_xrates(frm, rs);
1600 bo->bo_trailer_len = efrm - bo->bo_trailer;
1601 m->m_pkthdr.len = m->m_len = efrm - mtod(m, uint8_t *);
1602 KKASSERT(m->m_len <= pktlen);
1604 M_PREPEND(m, sizeof(struct ieee80211_frame), MB_DONTWAIT);
1605 KASSERT(m != NULL, ("no space for 802.11 header?"));
1606 wh = mtod(m, struct ieee80211_frame *);
1607 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
1608 IEEE80211_FC0_SUBTYPE_BEACON;
1609 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1610 *(uint16_t *)wh->i_dur = 0;
1611 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
1612 IEEE80211_ADDR_COPY(wh->i_addr2, ic->ic_myaddr);
1613 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
1614 *(uint16_t *)wh->i_seq = 0;
1620 * Update the dynamic parts of a beacon frame based on the current state.
1623 ieee80211_beacon_update(struct ieee80211com *ic, struct ieee80211_node *ni,
1624 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast)
1626 int len_changed = 0;
1629 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer);
1631 /* XXX faster to recalculate entirely or just changes? */
1632 capinfo = getcapinfo(ic, ni->ni_chan);
1633 *bo->bo_caps = htole16(capinfo);
1635 if (ic->ic_flags & IEEE80211_F_WME) {
1636 struct ieee80211_wme_state *wme = &ic->ic_wme;
1639 * Check for agressive mode change. When there is
1640 * significant high priority traffic in the BSS
1641 * throttle back BE traffic by using conservative
1642 * parameters. Otherwise BE uses agressive params
1643 * to optimize performance of legacy/non-QoS traffic.
1645 if (wme->wme_flags & WME_F_AGGRMODE) {
1646 if (wme->wme_hipri_traffic >
1647 wme->wme_hipri_switch_thresh) {
1648 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME,
1649 "%s: traffic %u, disable aggressive mode\n",
1650 __func__, wme->wme_hipri_traffic);
1651 wme->wme_flags &= ~WME_F_AGGRMODE;
1652 ieee80211_wme_updateparams(ic);
1653 wme->wme_hipri_traffic =
1654 wme->wme_hipri_switch_hysteresis;
1656 wme->wme_hipri_traffic = 0;
1658 if (wme->wme_hipri_traffic <=
1659 wme->wme_hipri_switch_thresh) {
1660 IEEE80211_DPRINTF(ic, IEEE80211_MSG_WME,
1661 "%s: traffic %u, enable 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 = 0;
1667 wme->wme_hipri_traffic =
1668 wme->wme_hipri_switch_hysteresis;
1670 if (ic->ic_flags & IEEE80211_F_WMEUPDATE) {
1671 (void) ieee80211_add_wme_param(bo->bo_wme, wme);
1672 ic->ic_flags &= ~IEEE80211_F_WMEUPDATE;
1676 if (ic->ic_opmode == IEEE80211_M_HOSTAP) { /* NB: no IBSS support*/
1677 struct ieee80211_tim_ie *tie =
1678 (struct ieee80211_tim_ie *) bo->bo_tim;
1679 if (ic->ic_flags & IEEE80211_F_TIMUPDATE) {
1680 u_int timlen, timoff, i;
1682 * ATIM/DTIM needs updating. If it fits in the
1683 * current space allocated then just copy in the
1684 * new bits. Otherwise we need to move any trailing
1685 * data to make room. Note that we know there is
1686 * contiguous space because ieee80211_beacon_allocate
1687 * insures there is space in the mbuf to write a
1688 * maximal-size virtual bitmap (based on ic_max_aid).
1691 * Calculate the bitmap size and offset, copy any
1692 * trailer out of the way, and then copy in the
1693 * new bitmap and update the information element.
1694 * Note that the tim bitmap must contain at least
1695 * one byte and any offset must be even.
1697 if (ic->ic_ps_pending != 0) {
1698 timoff = 128; /* impossibly large */
1699 for (i = 0; i < ic->ic_tim_len; i++)
1700 if (ic->ic_tim_bitmap[i]) {
1704 KASSERT(timoff != 128, ("tim bitmap empty!"));
1705 for (i = ic->ic_tim_len-1; i >= timoff; i--)
1706 if (ic->ic_tim_bitmap[i])
1708 timlen = 1 + (i - timoff);
1713 if (timlen != bo->bo_tim_len) {
1714 /* copy up/down trailer */
1715 int adjust = tie->tim_bitmap+timlen
1717 ovbcopy(bo->bo_trailer, bo->bo_trailer+adjust,
1718 bo->bo_trailer_len);
1719 bo->bo_trailer += adjust;
1720 bo->bo_wme += adjust;
1721 bo->bo_erp += adjust;
1722 bo->bo_tim_len = timlen;
1724 /* update information element */
1725 tie->tim_len = 3 + timlen;
1726 tie->tim_bitctl = timoff;
1729 memcpy(tie->tim_bitmap, ic->ic_tim_bitmap + timoff,
1732 ic->ic_flags &= ~IEEE80211_F_TIMUPDATE;
1734 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
1735 "%s: TIM updated, pending %u, off %u, len %u\n",
1736 __func__, ic->ic_ps_pending, timoff, timlen);
1738 /* count down DTIM period */
1739 if (tie->tim_count == 0)
1740 tie->tim_count = tie->tim_period - 1;
1743 /* update state for buffered multicast frames on DTIM */
1744 if (mcast && tie->tim_count == 0)
1745 tie->tim_bitctl |= 1;
1747 tie->tim_bitctl &= ~1;
1748 if (ic->ic_flags_ext & IEEE80211_FEXT_ERPUPDATE) {
1750 * ERP element needs updating.
1752 (void) ieee80211_add_erp(bo->bo_erp, ic);
1753 ic->ic_flags_ext &= ~IEEE80211_FEXT_ERPUPDATE;
1761 * Save an outbound packet for a node in power-save sleep state.
1762 * The new packet is placed on the node's saved queue, and the TIM
1763 * is changed, if necessary.
1766 ieee80211_pwrsave(struct ieee80211com *ic, struct ieee80211_node *ni,
1771 ASSERT_SERIALIZED(ic->ic_ifp->if_serializer);
1773 if (IF_QFULL(&ni->ni_savedq)) {
1774 IF_DROP(&ni->ni_savedq);
1775 IEEE80211_DPRINTF(ic, IEEE80211_MSG_ANY,
1776 "[%6D] pwr save q overflow, drops %d (size %d)\n",
1777 ni->ni_macaddr, ":",
1778 ni->ni_savedq.ifq_drops, IEEE80211_PS_MAX_QUEUE);
1779 #ifdef IEEE80211_DEBUG
1780 if (ieee80211_msg_dumppkts(ic))
1781 ieee80211_dump_pkt(mtod(m, caddr_t), m->m_len, -1, -1);
1787 * Tag the frame with it's expiry time and insert
1788 * it in the queue. The aging interval is 4 times
1789 * the listen interval specified by the station.
1790 * Frames that sit around too long are reclaimed
1791 * using this information.
1793 /* TU -> secs. XXX handle overflow? */
1794 age = IEEE80211_TU_TO_MS((ni->ni_intval * ic->ic_bintval) << 2) / 1000;
1795 _IEEE80211_NODE_SAVEQ_ENQUEUE(ni, m, qlen, age);
1797 IEEE80211_DPRINTF(ic, IEEE80211_MSG_POWER,
1798 "[%6D] save frame with age %d, %u now queued\n",
1799 ni->ni_macaddr, ":", age, qlen);
1802 ic->ic_set_tim(ni, 1);