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keyserv(1): drop useless comparison.
[freebsd-src.git] / sys / net80211 / ieee80211_output.c
blob1f49237f1d772c82078a997c6cf5928eaa41072b
1 /*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2009 Sam Leffler, Errno Consulting
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
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 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD$");
29
30 #include "opt_inet.h"
31 #include "opt_inet6.h"
32 #include "opt_wlan.h"
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/mbuf.h>
39 #include <sys/endian.h>
40
41 #include <sys/socket.h>
42
43 #include <net/bpf.h>
44 #include <net/ethernet.h>
45 #include <net/if.h>
46 #include <net/if_var.h>
47 #include <net/if_llc.h>
48 #include <net/if_media.h>
49 #include <net/if_vlan_var.h>
50
51 #include <net80211/ieee80211_var.h>
52 #include <net80211/ieee80211_regdomain.h>
53 #ifdef IEEE80211_SUPPORT_SUPERG
54 #include <net80211/ieee80211_superg.h>
55 #endif
56 #ifdef IEEE80211_SUPPORT_TDMA
57 #include <net80211/ieee80211_tdma.h>
58 #endif
59 #include <net80211/ieee80211_wds.h>
60 #include <net80211/ieee80211_mesh.h>
61
62 #if defined(INET) || defined(INET6)
63 #include <netinet/in.h>
64 #endif
65
66 #ifdef INET
67 #include <netinet/if_ether.h>
68 #include <netinet/in_systm.h>
69 #include <netinet/ip.h>
70 #endif
71 #ifdef INET6
72 #include <netinet/ip6.h>
73 #endif
74
75 #include <security/mac/mac_framework.h>
76
77 #define ETHER_HEADER_COPY(dst, src) \
78 memcpy(dst, src, sizeof(struct ether_header))
79
80 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *,
81 u_int hdrsize, u_int ciphdrsize, u_int mtu);
82 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int);
83
84 #ifdef IEEE80211_DEBUG
85 /*
86 * Decide if an outbound management frame should be
87 * printed when debugging is enabled. This filters some
88 * of the less interesting frames that come frequently
89 * (e.g. beacons).
90 */
91 static __inline int
92 doprint(struct ieee80211vap *vap, int subtype)
93 {
94 switch (subtype) {
95 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
96 return (vap->iv_opmode == IEEE80211_M_IBSS);
97 }
98 return 1;
99 }
100 #endif
101
102 /*
103 * Transmit a frame to the given destination on the given VAP.
104 *
105 * It's up to the caller to figure out the details of who this
106 * is going to and resolving the node.
107 *
108 * This routine takes care of queuing it for power save,
109 * A-MPDU state stuff, fast-frames state stuff, encapsulation
110 * if required, then passing it up to the driver layer.
111 *
112 * This routine (for now) consumes the mbuf and frees the node
113 * reference; it ideally will return a TX status which reflects
114 * whether the mbuf was consumed or not, so the caller can
115 * free the mbuf (if appropriate) and the node reference (again,
116 * if appropriate.)
117 */
118 int
119 ieee80211_vap_pkt_send_dest(struct ieee80211vap *vap, struct mbuf *m,
120 struct ieee80211_node *ni)
121 {
122 struct ieee80211com *ic = vap->iv_ic;
123 struct ifnet *ifp = vap->iv_ifp;
124 #ifdef IEEE80211_SUPPORT_SUPERG
125 int mcast;
126 #endif
127
128 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
129 (m->m_flags & M_PWR_SAV) == 0) {
130 /*
131 * Station in power save mode; pass the frame
132 * to the 802.11 layer and continue. We'll get
133 * the frame back when the time is right.
134 * XXX lose WDS vap linkage?
135 */
136 if (ieee80211_pwrsave(ni, m) != 0)
137 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
138 ieee80211_free_node(ni);
139
140 /*
141 * We queued it fine, so tell the upper layer
142 * that we consumed it.
143 */
144 return (0);
145 }
146 /* calculate priority so drivers can find the tx queue */
147 if (ieee80211_classify(ni, m)) {
148 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
149 ni->ni_macaddr, NULL,
150 "%s", "classification failure");
151 vap->iv_stats.is_tx_classify++;
152 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
153 m_freem(m);
154 ieee80211_free_node(ni);
155
156 /* XXX better status? */
157 return (0);
158 }
159 /*
160 * Stash the node pointer. Note that we do this after
161 * any call to ieee80211_dwds_mcast because that code
162 * uses any existing value for rcvif to identify the
163 * interface it (might have been) received on.
164 */
165 m->m_pkthdr.rcvif = (void *)ni;
166 #ifdef IEEE80211_SUPPORT_SUPERG
167 mcast = (m->m_flags & (M_MCAST | M_BCAST)) ? 1: 0;
168 #endif
169
170 BPF_MTAP(ifp, m); /* 802.3 tx */
171
172 /*
173 * Check if A-MPDU tx aggregation is setup or if we
174 * should try to enable it. The sta must be associated
175 * with HT and A-MPDU enabled for use. When the policy
176 * routine decides we should enable A-MPDU we issue an
177 * ADDBA request and wait for a reply. The frame being
178 * encapsulated will go out w/o using A-MPDU, or possibly
179 * it might be collected by the driver and held/retransmit.
180 * The default ic_ampdu_enable routine handles staggering
181 * ADDBA requests in case the receiver NAK's us or we are
182 * otherwise unable to establish a BA stream.
183 */
184 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) &&
185 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX)) {
186 if ((m->m_flags & M_EAPOL) == 0) {
187 int tid = WME_AC_TO_TID(M_WME_GETAC(m));
188 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[tid];
189
190 ieee80211_txampdu_count_packet(tap);
191 if (IEEE80211_AMPDU_RUNNING(tap)) {
192 /*
193 * Operational, mark frame for aggregation.
194 *
195 * XXX do tx aggregation here
196 */
197 m->m_flags |= M_AMPDU_MPDU;
198 } else if (!IEEE80211_AMPDU_REQUESTED(tap) &&
199 ic->ic_ampdu_enable(ni, tap)) {
200 /*
201 * Not negotiated yet, request service.
202 */
203 ieee80211_ampdu_request(ni, tap);
204 /* XXX hold frame for reply? */
205 }
206 }
207 }
208
209 #ifdef IEEE80211_SUPPORT_SUPERG
210 /*
211 * Check for AMSDU/FF; queue for aggregation
212 *
213 * Note: we don't bother trying to do fast frames or
214 * A-MSDU encapsulation for 802.3 drivers. Now, we
215 * likely could do it for FF (because it's a magic
216 * atheros tunnel LLC type) but I don't think we're going
217 * to really need to. For A-MSDU we'd have to set the
218 * A-MSDU QoS bit in the wifi header, so we just plain
219 * can't do it.
220 *
221 * Strictly speaking, we could actually /do/ A-MSDU / FF
222 * with A-MPDU together which for certain circumstances
223 * is beneficial (eg A-MSDU of TCK ACKs.) However,
224 * I'll ignore that for now so existing behaviour is maintained.
225 * Later on it would be good to make "amsdu + ampdu" configurable.
226 */
227 else if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
228 if ((! mcast) && ieee80211_amsdu_tx_ok(ni)) {
229 m = ieee80211_amsdu_check(ni, m);
230 if (m == NULL) {
231 /* NB: any ni ref held on stageq */
232 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
233 "%s: amsdu_check queued frame\n",
234 __func__);
235 return (0);
236 }
237 } else if ((! mcast) && IEEE80211_ATH_CAP(vap, ni,
238 IEEE80211_NODE_FF)) {
239 m = ieee80211_ff_check(ni, m);
240 if (m == NULL) {
241 /* NB: any ni ref held on stageq */
242 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
243 "%s: ff_check queued frame\n",
244 __func__);
245 return (0);
246 }
247 }
248 }
249 #endif /* IEEE80211_SUPPORT_SUPERG */
250
251 /*
252 * Grab the TX lock - serialise the TX process from this
253 * point (where TX state is being checked/modified)
254 * through to driver queue.
255 */
256 IEEE80211_TX_LOCK(ic);
257
258 /*
259 * XXX make the encap and transmit code a separate function
260 * so things like the FF (and later A-MSDU) path can just call
261 * it for flushed frames.
262 */
263 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
264 /*
265 * Encapsulate the packet in prep for transmission.
266 */
267 m = ieee80211_encap(vap, ni, m);
268 if (m == NULL) {
269 /* NB: stat+msg handled in ieee80211_encap */
270 IEEE80211_TX_UNLOCK(ic);
271 ieee80211_free_node(ni);
272 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
273 return (ENOBUFS);
274 }
275 }
276 (void) ieee80211_parent_xmitpkt(ic, m);
277
278 /*
279 * Unlock at this point - no need to hold it across
280 * ieee80211_free_node() (ie, the comlock)
281 */
282 IEEE80211_TX_UNLOCK(ic);
283 ic->ic_lastdata = ticks;
284
285 return (0);
286 }
287
288
289
290 /*
291 * Send the given mbuf through the given vap.
292 *
293 * This consumes the mbuf regardless of whether the transmit
294 * was successful or not.
295 *
296 * This does none of the initial checks that ieee80211_start()
297 * does (eg CAC timeout, interface wakeup) - the caller must
298 * do this first.
299 */
300 static int
301 ieee80211_start_pkt(struct ieee80211vap *vap, struct mbuf *m)
302 {
303 #define IS_DWDS(vap) \
304 (vap->iv_opmode == IEEE80211_M_WDS && \
305 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0)
306 struct ieee80211com *ic = vap->iv_ic;
307 struct ifnet *ifp = vap->iv_ifp;
308 struct ieee80211_node *ni;
309 struct ether_header *eh;
310
311 /*
312 * Cancel any background scan.
313 */
314 if (ic->ic_flags & IEEE80211_F_SCAN)
315 ieee80211_cancel_anyscan(vap);
316 /*
317 * Find the node for the destination so we can do
318 * things like power save and fast frames aggregation.
319 *
320 * NB: past this point various code assumes the first
321 * mbuf has the 802.3 header present (and contiguous).
322 */
323 ni = NULL;
324 if (m->m_len < sizeof(struct ether_header) &&
325 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
326 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
327 "discard frame, %s\n", "m_pullup failed");
328 vap->iv_stats.is_tx_nobuf++; /* XXX */
329 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
330 return (ENOBUFS);
331 }
332 eh = mtod(m, struct ether_header *);
333 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
334 if (IS_DWDS(vap)) {
335 /*
336 * Only unicast frames from the above go out
337 * DWDS vaps; multicast frames are handled by
338 * dispatching the frame as it comes through
339 * the AP vap (see below).
340 */
341 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS,
342 eh->ether_dhost, "mcast", "%s", "on DWDS");
343 vap->iv_stats.is_dwds_mcast++;
344 m_freem(m);
345 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
346 /* XXX better status? */
347 return (ENOBUFS);
348 }
349 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
350 /*
351 * Spam DWDS vap's w/ multicast traffic.
352 */
353 /* XXX only if dwds in use? */
354 ieee80211_dwds_mcast(vap, m);
355 }
356 }
357 #ifdef IEEE80211_SUPPORT_MESH
358 if (vap->iv_opmode != IEEE80211_M_MBSS) {
359 #endif
360 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
361 if (ni == NULL) {
362 /* NB: ieee80211_find_txnode does stat+msg */
363 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
364 m_freem(m);
365 /* XXX better status? */
366 return (ENOBUFS);
367 }
368 if (ni->ni_associd == 0 &&
369 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) {
370 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
371 eh->ether_dhost, NULL,
372 "sta not associated (type 0x%04x)",
373 htons(eh->ether_type));
374 vap->iv_stats.is_tx_notassoc++;
375 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
376 m_freem(m);
377 ieee80211_free_node(ni);
378 /* XXX better status? */
379 return (ENOBUFS);
380 }
381 #ifdef IEEE80211_SUPPORT_MESH
382 } else {
383 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) {
384 /*
385 * Proxy station only if configured.
386 */
387 if (!ieee80211_mesh_isproxyena(vap)) {
388 IEEE80211_DISCARD_MAC(vap,
389 IEEE80211_MSG_OUTPUT |
390 IEEE80211_MSG_MESH,
391 eh->ether_dhost, NULL,
392 "%s", "proxy not enabled");
393 vap->iv_stats.is_mesh_notproxy++;
394 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
395 m_freem(m);
396 /* XXX better status? */
397 return (ENOBUFS);
398 }
399 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
400 "forward frame from DS SA(%6D), DA(%6D)\n",
401 eh->ether_shost, ":",
402 eh->ether_dhost, ":");
403 ieee80211_mesh_proxy_check(vap, eh->ether_shost);
404 }
405 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m);
406 if (ni == NULL) {
407 /*
408 * NB: ieee80211_mesh_discover holds/disposes
409 * frame (e.g. queueing on path discovery).
410 */
411 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
412 /* XXX better status? */
413 return (ENOBUFS);
414 }
415 }
416 #endif
417
418 /*
419 * We've resolved the sender, so attempt to transmit it.
420 */
421
422 if (vap->iv_state == IEEE80211_S_SLEEP) {
423 /*
424 * In power save; queue frame and then wakeup device
425 * for transmit.
426 */
427 ic->ic_lastdata = ticks;
428 if (ieee80211_pwrsave(ni, m) != 0)
429 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
430 ieee80211_free_node(ni);
431 ieee80211_new_state(vap, IEEE80211_S_RUN, 0);
432 return (0);
433 }
434
435 if (ieee80211_vap_pkt_send_dest(vap, m, ni) != 0)
436 return (ENOBUFS);
437 return (0);
438 #undef IS_DWDS
439 }
440
441 /*
442 * Start method for vap's. All packets from the stack come
443 * through here. We handle common processing of the packets
444 * before dispatching them to the underlying device.
445 *
446 * if_transmit() requires that the mbuf be consumed by this call
447 * regardless of the return condition.
448 */
449 int
450 ieee80211_vap_transmit(struct ifnet *ifp, struct mbuf *m)
451 {
452 struct ieee80211vap *vap = ifp->if_softc;
453 struct ieee80211com *ic = vap->iv_ic;
454
455 /*
456 * No data frames go out unless we're running.
457 * Note in particular this covers CAC and CSA
458 * states (though maybe we should check muting
459 * for CSA).
460 */
461 if (vap->iv_state != IEEE80211_S_RUN &&
462 vap->iv_state != IEEE80211_S_SLEEP) {
463 IEEE80211_LOCK(ic);
464 /* re-check under the com lock to avoid races */
465 if (vap->iv_state != IEEE80211_S_RUN &&
466 vap->iv_state != IEEE80211_S_SLEEP) {
467 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
468 "%s: ignore queue, in %s state\n",
469 __func__, ieee80211_state_name[vap->iv_state]);
470 vap->iv_stats.is_tx_badstate++;
471 IEEE80211_UNLOCK(ic);
472 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
473 m_freem(m);
474 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
475 return (ENETDOWN);
476 }
477 IEEE80211_UNLOCK(ic);
478 }
479
480 /*
481 * Sanitize mbuf flags for net80211 use. We cannot
482 * clear M_PWR_SAV or M_MORE_DATA because these may
483 * be set for frames that are re-submitted from the
484 * power save queue.
485 *
486 * NB: This must be done before ieee80211_classify as
487 * it marks EAPOL in frames with M_EAPOL.
488 */
489 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA);
490
491 /*
492 * Bump to the packet transmission path.
493 * The mbuf will be consumed here.
494 */
495 return (ieee80211_start_pkt(vap, m));
496 }
497
498 void
499 ieee80211_vap_qflush(struct ifnet *ifp)
500 {
501
502 /* Empty for now */
503 }
504
505 /*
506 * 802.11 raw output routine.
507 *
508 * XXX TODO: this (and other send routines) should correctly
509 * XXX keep the pwr mgmt bit set if it decides to call into the
510 * XXX driver to send a frame whilst the state is SLEEP.
511 *
512 * Otherwise the peer may decide that we're awake and flood us
513 * with traffic we are still too asleep to receive!
514 */
515 int
516 ieee80211_raw_output(struct ieee80211vap *vap, struct ieee80211_node *ni,
517 struct mbuf *m, const struct ieee80211_bpf_params *params)
518 {
519 struct ieee80211com *ic = vap->iv_ic;
520 int error;
521
522 /*
523 * Set node - the caller has taken a reference, so ensure
524 * that the mbuf has the same node value that
525 * it would if it were going via the normal path.
526 */
527 m->m_pkthdr.rcvif = (void *)ni;
528
529 /*
530 * Attempt to add bpf transmit parameters.
531 *
532 * For now it's ok to fail; the raw_xmit api still takes
533 * them as an option.
534 *
535 * Later on when ic_raw_xmit() has params removed,
536 * they'll have to be added - so fail the transmit if
537 * they can't be.
538 */
539 if (params)
540 (void) ieee80211_add_xmit_params(m, params);
541
542 error = ic->ic_raw_xmit(ni, m, params);
543 if (error) {
544 if_inc_counter(vap->iv_ifp, IFCOUNTER_OERRORS, 1);
545 ieee80211_free_node(ni);
546 }
547 return (error);
548 }
549
550 /*
551 * 802.11 output routine. This is (currently) used only to
552 * connect bpf write calls to the 802.11 layer for injecting
553 * raw 802.11 frames.
554 */
555 int
556 ieee80211_output(struct ifnet *ifp, struct mbuf *m,
557 const struct sockaddr *dst, struct route *ro)
558 {
559 #define senderr(e) do { error = (e); goto bad;} while (0)
560 struct ieee80211_node *ni = NULL;
561 struct ieee80211vap *vap;
562 struct ieee80211_frame *wh;
563 struct ieee80211com *ic = NULL;
564 int error;
565 int ret;
566
567 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) {
568 /*
569 * Short-circuit requests if the vap is marked OACTIVE
570 * as this can happen because a packet came down through
571 * ieee80211_start before the vap entered RUN state in
572 * which case it's ok to just drop the frame. This
573 * should not be necessary but callers of if_output don't
574 * check OACTIVE.
575 */
576 senderr(ENETDOWN);
577 }
578 vap = ifp->if_softc;
579 ic = vap->iv_ic;
580 /*
581 * Hand to the 802.3 code if not tagged as
582 * a raw 802.11 frame.
583 */
584 if (dst->sa_family != AF_IEEE80211)
585 return vap->iv_output(ifp, m, dst, ro);
586 #ifdef MAC
587 error = mac_ifnet_check_transmit(ifp, m);
588 if (error)
589 senderr(error);
590 #endif
591 if (ifp->if_flags & IFF_MONITOR)
592 senderr(ENETDOWN);
593 if (!IFNET_IS_UP_RUNNING(ifp))
594 senderr(ENETDOWN);
595 if (vap->iv_state == IEEE80211_S_CAC) {
596 IEEE80211_DPRINTF(vap,
597 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
598 "block %s frame in CAC state\n", "raw data");
599 vap->iv_stats.is_tx_badstate++;
600 senderr(EIO); /* XXX */
601 } else if (vap->iv_state == IEEE80211_S_SCAN)
602 senderr(EIO);
603 /* XXX bypass bridge, pfil, carp, etc. */
604
605 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack))
606 senderr(EIO); /* XXX */
607 wh = mtod(m, struct ieee80211_frame *);
608 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
609 IEEE80211_FC0_VERSION_0)
610 senderr(EIO); /* XXX */
611
612 /* locate destination node */
613 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
614 case IEEE80211_FC1_DIR_NODS:
615 case IEEE80211_FC1_DIR_FROMDS:
616 ni = ieee80211_find_txnode(vap, wh->i_addr1);
617 break;
618 case IEEE80211_FC1_DIR_TODS:
619 case IEEE80211_FC1_DIR_DSTODS:
620 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame))
621 senderr(EIO); /* XXX */
622 ni = ieee80211_find_txnode(vap, wh->i_addr3);
623 break;
624 default:
625 senderr(EIO); /* XXX */
626 }
627 if (ni == NULL) {
628 /*
629 * Permit packets w/ bpf params through regardless
630 * (see below about sa_len).
631 */
632 if (dst->sa_len == 0)
633 senderr(EHOSTUNREACH);
634 ni = ieee80211_ref_node(vap->iv_bss);
635 }
636
637 /*
638 * Sanitize mbuf for net80211 flags leaked from above.
639 *
640 * NB: This must be done before ieee80211_classify as
641 * it marks EAPOL in frames with M_EAPOL.
642 */
643 m->m_flags &= ~M_80211_TX;
644
645 /* calculate priority so drivers can find the tx queue */
646 /* XXX assumes an 802.3 frame */
647 if (ieee80211_classify(ni, m))
648 senderr(EIO); /* XXX */
649
650 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
651 IEEE80211_NODE_STAT(ni, tx_data);
652 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
653 IEEE80211_NODE_STAT(ni, tx_mcast);
654 m->m_flags |= M_MCAST;
655 } else
656 IEEE80211_NODE_STAT(ni, tx_ucast);
657 /* NB: ieee80211_encap does not include 802.11 header */
658 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len);
659
660 IEEE80211_TX_LOCK(ic);
661
662 /*
663 * NB: DLT_IEEE802_11_RADIO identifies the parameters are
664 * present by setting the sa_len field of the sockaddr (yes,
665 * this is a hack).
666 * NB: we assume sa_data is suitably aligned to cast.
667 */
668 ret = ieee80211_raw_output(vap, ni, m,
669 (const struct ieee80211_bpf_params *)(dst->sa_len ?
670 dst->sa_data : NULL));
671 IEEE80211_TX_UNLOCK(ic);
672 return (ret);
673 bad:
674 if (m != NULL)
675 m_freem(m);
676 if (ni != NULL)
677 ieee80211_free_node(ni);
678 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
679 return error;
680 #undef senderr
681 }
682
683 /*
684 * Set the direction field and address fields of an outgoing
685 * frame. Note this should be called early on in constructing
686 * a frame as it sets i_fc[1]; other bits can then be or'd in.
687 */
688 void
689 ieee80211_send_setup(
690 struct ieee80211_node *ni,
691 struct mbuf *m,
692 int type, int tid,
693 const uint8_t sa[IEEE80211_ADDR_LEN],
694 const uint8_t da[IEEE80211_ADDR_LEN],
695 const uint8_t bssid[IEEE80211_ADDR_LEN])
696 {
697 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
698 struct ieee80211vap *vap = ni->ni_vap;
699 struct ieee80211_tx_ampdu *tap;
700 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
701 ieee80211_seq seqno;
702
703 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic);
704
705 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
706 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
707 switch (vap->iv_opmode) {
708 case IEEE80211_M_STA:
709 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
710 IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
711 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
712 IEEE80211_ADDR_COPY(wh->i_addr3, da);
713 break;
714 case IEEE80211_M_IBSS:
715 case IEEE80211_M_AHDEMO:
716 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
717 IEEE80211_ADDR_COPY(wh->i_addr1, da);
718 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
719 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
720 break;
721 case IEEE80211_M_HOSTAP:
722 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
723 IEEE80211_ADDR_COPY(wh->i_addr1, da);
724 IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
725 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
726 break;
727 case IEEE80211_M_WDS:
728 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
729 IEEE80211_ADDR_COPY(wh->i_addr1, da);
730 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
731 IEEE80211_ADDR_COPY(wh->i_addr3, da);
732 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
733 break;
734 case IEEE80211_M_MBSS:
735 #ifdef IEEE80211_SUPPORT_MESH
736 if (IEEE80211_IS_MULTICAST(da)) {
737 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
738 /* XXX next hop */
739 IEEE80211_ADDR_COPY(wh->i_addr1, da);
740 IEEE80211_ADDR_COPY(wh->i_addr2,
741 vap->iv_myaddr);
742 } else {
743 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
744 IEEE80211_ADDR_COPY(wh->i_addr1, da);
745 IEEE80211_ADDR_COPY(wh->i_addr2,
746 vap->iv_myaddr);
747 IEEE80211_ADDR_COPY(wh->i_addr3, da);
748 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
749 }
750 #endif
751 break;
752 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */
753 break;
754 }
755 } else {
756 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
757 IEEE80211_ADDR_COPY(wh->i_addr1, da);
758 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
759 #ifdef IEEE80211_SUPPORT_MESH
760 if (vap->iv_opmode == IEEE80211_M_MBSS)
761 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
762 else
763 #endif
764 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
765 }
766 *(uint16_t *)&wh->i_dur[0] = 0;
767
768 tap = &ni->ni_tx_ampdu[tid];
769 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap))
770 m->m_flags |= M_AMPDU_MPDU;
771 else {
772 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK,
773 type & IEEE80211_FC0_SUBTYPE_MASK))
774 seqno = ni->ni_txseqs[tid]++;
775 else
776 seqno = 0;
777
778 *(uint16_t *)&wh->i_seq[0] =
779 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
780 M_SEQNO_SET(m, seqno);
781 }
782
783 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
784 m->m_flags |= M_MCAST;
785 #undef WH4
786 }
787
788 /*
789 * Send a management frame to the specified node. The node pointer
790 * must have a reference as the pointer will be passed to the driver
791 * and potentially held for a long time. If the frame is successfully
792 * dispatched to the driver, then it is responsible for freeing the
793 * reference (and potentially free'ing up any associated storage);
794 * otherwise deal with reclaiming any reference (on error).
795 */
796 int
797 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
798 struct ieee80211_bpf_params *params)
799 {
800 struct ieee80211vap *vap = ni->ni_vap;
801 struct ieee80211com *ic = ni->ni_ic;
802 struct ieee80211_frame *wh;
803 int ret;
804
805 KASSERT(ni != NULL, ("null node"));
806
807 if (vap->iv_state == IEEE80211_S_CAC) {
808 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
809 ni, "block %s frame in CAC state",
810 ieee80211_mgt_subtype_name(type));
811 vap->iv_stats.is_tx_badstate++;
812 ieee80211_free_node(ni);
813 m_freem(m);
814 return EIO; /* XXX */
815 }
816
817 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
818 if (m == NULL) {
819 ieee80211_free_node(ni);
820 return ENOMEM;
821 }
822
823 IEEE80211_TX_LOCK(ic);
824
825 wh = mtod(m, struct ieee80211_frame *);
826 ieee80211_send_setup(ni, m,
827 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
828 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
829 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
830 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
831 "encrypting frame (%s)", __func__);
832 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
833 }
834 m->m_flags |= M_ENCAP; /* mark encapsulated */
835
836 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
837 M_WME_SETAC(m, params->ibp_pri);
838
839 #ifdef IEEE80211_DEBUG
840 /* avoid printing too many frames */
841 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
842 ieee80211_msg_dumppkts(vap)) {
843 printf("[%s] send %s on channel %u\n",
844 ether_sprintf(wh->i_addr1),
845 ieee80211_mgt_subtype_name(type),
846 ieee80211_chan2ieee(ic, ic->ic_curchan));
847 }
848 #endif
849 IEEE80211_NODE_STAT(ni, tx_mgmt);
850
851 ret = ieee80211_raw_output(vap, ni, m, params);
852 IEEE80211_TX_UNLOCK(ic);
853 return (ret);
854 }
855
856 static void
857 ieee80211_nulldata_transmitted(struct ieee80211_node *ni, void *arg,
858 int status)
859 {
860 struct ieee80211vap *vap = ni->ni_vap;
861
862 wakeup(vap);
863 }
864
865 /*
866 * Send a null data frame to the specified node. If the station
867 * is setup for QoS then a QoS Null Data frame is constructed.
868 * If this is a WDS station then a 4-address frame is constructed.
869 *
870 * NB: the caller is assumed to have setup a node reference
871 * for use; this is necessary to deal with a race condition
872 * when probing for inactive stations. Like ieee80211_mgmt_output
873 * we must cleanup any node reference on error; however we
874 * can safely just unref it as we know it will never be the
875 * last reference to the node.
876 */
877 int
878 ieee80211_send_nulldata(struct ieee80211_node *ni)
879 {
880 struct ieee80211vap *vap = ni->ni_vap;
881 struct ieee80211com *ic = ni->ni_ic;
882 struct mbuf *m;
883 struct ieee80211_frame *wh;
884 int hdrlen;
885 uint8_t *frm;
886 int ret;
887
888 if (vap->iv_state == IEEE80211_S_CAC) {
889 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
890 ni, "block %s frame in CAC state", "null data");
891 ieee80211_unref_node(&ni);
892 vap->iv_stats.is_tx_badstate++;
893 return EIO; /* XXX */
894 }
895
896 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
897 hdrlen = sizeof(struct ieee80211_qosframe);
898 else
899 hdrlen = sizeof(struct ieee80211_frame);
900 /* NB: only WDS vap's get 4-address frames */
901 if (vap->iv_opmode == IEEE80211_M_WDS)
902 hdrlen += IEEE80211_ADDR_LEN;
903 if (ic->ic_flags & IEEE80211_F_DATAPAD)
904 hdrlen = roundup(hdrlen, sizeof(uint32_t));
905
906 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
907 if (m == NULL) {
908 /* XXX debug msg */
909 ieee80211_unref_node(&ni);
910 vap->iv_stats.is_tx_nobuf++;
911 return ENOMEM;
912 }
913 KASSERT(M_LEADINGSPACE(m) >= hdrlen,
914 ("leading space %zd", M_LEADINGSPACE(m)));
915 M_PREPEND(m, hdrlen, M_NOWAIT);
916 if (m == NULL) {
917 /* NB: cannot happen */
918 ieee80211_free_node(ni);
919 return ENOMEM;
920 }
921
922 IEEE80211_TX_LOCK(ic);
923
924 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */
925 if (ni->ni_flags & IEEE80211_NODE_QOS) {
926 const int tid = WME_AC_TO_TID(WME_AC_BE);
927 uint8_t *qos;
928
929 ieee80211_send_setup(ni, m,
930 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
931 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
932
933 if (vap->iv_opmode == IEEE80211_M_WDS)
934 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
935 else
936 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
937 qos[0] = tid & IEEE80211_QOS_TID;
938 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
939 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
940 qos[1] = 0;
941 } else {
942 ieee80211_send_setup(ni, m,
943 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
944 IEEE80211_NONQOS_TID,
945 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
946 }
947 if (vap->iv_opmode != IEEE80211_M_WDS) {
948 /* NB: power management bit is never sent by an AP */
949 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
950 vap->iv_opmode != IEEE80211_M_HOSTAP)
951 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
952 }
953 if ((ic->ic_flags & IEEE80211_F_SCAN) &&
954 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)) {
955 ieee80211_add_callback(m, ieee80211_nulldata_transmitted,
956 NULL);
957 }
958 m->m_len = m->m_pkthdr.len = hdrlen;
959 m->m_flags |= M_ENCAP; /* mark encapsulated */
960
961 M_WME_SETAC(m, WME_AC_BE);
962
963 IEEE80211_NODE_STAT(ni, tx_data);
964
965 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
966 "send %snull data frame on channel %u, pwr mgt %s",
967 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
968 ieee80211_chan2ieee(ic, ic->ic_curchan),
969 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
970
971 ret = ieee80211_raw_output(vap, ni, m, NULL);
972 IEEE80211_TX_UNLOCK(ic);
973 return (ret);
974 }
975
976 /*
977 * Assign priority to a frame based on any vlan tag assigned
978 * to the station and/or any Diffserv setting in an IP header.
979 * Finally, if an ACM policy is setup (in station mode) it's
980 * applied.
981 */
982 int
983 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
984 {
985 const struct ether_header *eh = mtod(m, struct ether_header *);
986 int v_wme_ac, d_wme_ac, ac;
987
988 /*
989 * Always promote PAE/EAPOL frames to high priority.
990 */
991 if (eh->ether_type == htons(ETHERTYPE_PAE)) {
992 /* NB: mark so others don't need to check header */
993 m->m_flags |= M_EAPOL;
994 ac = WME_AC_VO;
995 goto done;
996 }
997 /*
998 * Non-qos traffic goes to BE.
999 */
1000 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
1001 ac = WME_AC_BE;
1002 goto done;
1003 }
1004
1005 /*
1006 * If node has a vlan tag then all traffic
1007 * to it must have a matching tag.
1008 */
1009 v_wme_ac = 0;
1010 if (ni->ni_vlan != 0) {
1011 if ((m->m_flags & M_VLANTAG) == 0) {
1012 IEEE80211_NODE_STAT(ni, tx_novlantag);
1013 return 1;
1014 }
1015 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
1016 EVL_VLANOFTAG(ni->ni_vlan)) {
1017 IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
1018 return 1;
1019 }
1020 /* map vlan priority to AC */
1021 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
1022 }
1023
1024 /* XXX m_copydata may be too slow for fast path */
1025 #ifdef INET
1026 if (eh->ether_type == htons(ETHERTYPE_IP)) {
1027 uint8_t tos;
1028 /*
1029 * IP frame, map the DSCP bits from the TOS field.
1030 */
1031 /* NB: ip header may not be in first mbuf */
1032 m_copydata(m, sizeof(struct ether_header) +
1033 offsetof(struct ip, ip_tos), sizeof(tos), &tos);
1034 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
1035 d_wme_ac = TID_TO_WME_AC(tos);
1036 } else {
1037 #endif /* INET */
1038 #ifdef INET6
1039 if (eh->ether_type == htons(ETHERTYPE_IPV6)) {
1040 uint32_t flow;
1041 uint8_t tos;
1042 /*
1043 * IPv6 frame, map the DSCP bits from the traffic class field.
1044 */
1045 m_copydata(m, sizeof(struct ether_header) +
1046 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow),
1047 (caddr_t) &flow);
1048 tos = (uint8_t)(ntohl(flow) >> 20);
1049 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
1050 d_wme_ac = TID_TO_WME_AC(tos);
1051 } else {
1052 #endif /* INET6 */
1053 d_wme_ac = WME_AC_BE;
1054 #ifdef INET6
1055 }
1056 #endif
1057 #ifdef INET
1058 }
1059 #endif
1060 /*
1061 * Use highest priority AC.
1062 */
1063 if (v_wme_ac > d_wme_ac)
1064 ac = v_wme_ac;
1065 else
1066 ac = d_wme_ac;
1067
1068 /*
1069 * Apply ACM policy.
1070 */
1071 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
1072 static const int acmap[4] = {
1073 WME_AC_BK, /* WME_AC_BE */
1074 WME_AC_BK, /* WME_AC_BK */
1075 WME_AC_BE, /* WME_AC_VI */
1076 WME_AC_VI, /* WME_AC_VO */
1077 };
1078 struct ieee80211com *ic = ni->ni_ic;
1079
1080 while (ac != WME_AC_BK &&
1081 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
1082 ac = acmap[ac];
1083 }
1084 done:
1085 M_WME_SETAC(m, ac);
1086 return 0;
1087 }
1088
1089 /*
1090 * Insure there is sufficient contiguous space to encapsulate the
1091 * 802.11 data frame. If room isn't already there, arrange for it.
1092 * Drivers and cipher modules assume we have done the necessary work
1093 * and fail rudely if they don't find the space they need.
1094 */
1095 struct mbuf *
1096 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
1097 struct ieee80211_key *key, struct mbuf *m)
1098 {
1099 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
1100 int needed_space = vap->iv_ic->ic_headroom + hdrsize;
1101
1102 if (key != NULL) {
1103 /* XXX belongs in crypto code? */
1104 needed_space += key->wk_cipher->ic_header;
1105 /* XXX frags */
1106 /*
1107 * When crypto is being done in the host we must insure
1108 * the data are writable for the cipher routines; clone
1109 * a writable mbuf chain.
1110 * XXX handle SWMIC specially
1111 */
1112 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
1113 m = m_unshare(m, M_NOWAIT);
1114 if (m == NULL) {
1115 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
1116 "%s: cannot get writable mbuf\n", __func__);
1117 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
1118 return NULL;
1119 }
1120 }
1121 }
1122 /*
1123 * We know we are called just before stripping an Ethernet
1124 * header and prepending an LLC header. This means we know
1125 * there will be
1126 * sizeof(struct ether_header) - sizeof(struct llc)
1127 * bytes recovered to which we need additional space for the
1128 * 802.11 header and any crypto header.
1129 */
1130 /* XXX check trailing space and copy instead? */
1131 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
1132 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
1133 if (n == NULL) {
1134 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
1135 "%s: cannot expand storage\n", __func__);
1136 vap->iv_stats.is_tx_nobuf++;
1137 m_freem(m);
1138 return NULL;
1139 }
1140 KASSERT(needed_space <= MHLEN,
1141 ("not enough room, need %u got %d\n", needed_space, MHLEN));
1142 /*
1143 * Setup new mbuf to have leading space to prepend the
1144 * 802.11 header and any crypto header bits that are
1145 * required (the latter are added when the driver calls
1146 * back to ieee80211_crypto_encap to do crypto encapsulation).
1147 */
1148 /* NB: must be first 'cuz it clobbers m_data */
1149 m_move_pkthdr(n, m);
1150 n->m_len = 0; /* NB: m_gethdr does not set */
1151 n->m_data += needed_space;
1152 /*
1153 * Pull up Ethernet header to create the expected layout.
1154 * We could use m_pullup but that's overkill (i.e. we don't
1155 * need the actual data) and it cannot fail so do it inline
1156 * for speed.
1157 */
1158 /* NB: struct ether_header is known to be contiguous */
1159 n->m_len += sizeof(struct ether_header);
1160 m->m_len -= sizeof(struct ether_header);
1161 m->m_data += sizeof(struct ether_header);
1162 /*
1163 * Replace the head of the chain.
1164 */
1165 n->m_next = m;
1166 m = n;
1167 }
1168 return m;
1169 #undef TO_BE_RECLAIMED
1170 }
1171
1172 /*
1173 * Return the transmit key to use in sending a unicast frame.
1174 * If a unicast key is set we use that. When no unicast key is set
1175 * we fall back to the default transmit key.
1176 */
1177 static __inline struct ieee80211_key *
1178 ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
1179 struct ieee80211_node *ni)
1180 {
1181 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
1182 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
1183 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
1184 return NULL;
1185 return &vap->iv_nw_keys[vap->iv_def_txkey];
1186 } else {
1187 return &ni->ni_ucastkey;
1188 }
1189 }
1190
1191 /*
1192 * Return the transmit key to use in sending a multicast frame.
1193 * Multicast traffic always uses the group key which is installed as
1194 * the default tx key.
1195 */
1196 static __inline struct ieee80211_key *
1197 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
1198 struct ieee80211_node *ni)
1199 {
1200 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
1201 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
1202 return NULL;
1203 return &vap->iv_nw_keys[vap->iv_def_txkey];
1204 }
1205
1206 /*
1207 * Encapsulate an outbound data frame. The mbuf chain is updated.
1208 * If an error is encountered NULL is returned. The caller is required
1209 * to provide a node reference and pullup the ethernet header in the
1210 * first mbuf.
1211 *
1212 * NB: Packet is assumed to be processed by ieee80211_classify which
1213 * marked EAPOL frames w/ M_EAPOL.
1214 */
1215 struct mbuf *
1216 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
1217 struct mbuf *m)
1218 {
1219 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
1220 #define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc)
1221 struct ieee80211com *ic = ni->ni_ic;
1222 #ifdef IEEE80211_SUPPORT_MESH
1223 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1224 struct ieee80211_meshcntl_ae10 *mc;
1225 struct ieee80211_mesh_route *rt = NULL;
1226 int dir = -1;
1227 #endif
1228 struct ether_header eh;
1229 struct ieee80211_frame *wh;
1230 struct ieee80211_key *key;
1231 struct llc *llc;
1232 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr;
1233 ieee80211_seq seqno;
1234 int meshhdrsize, meshae;
1235 uint8_t *qos;
1236 int is_amsdu = 0;
1237
1238 IEEE80211_TX_LOCK_ASSERT(ic);
1239
1240 /*
1241 * Copy existing Ethernet header to a safe place. The
1242 * rest of the code assumes it's ok to strip it when
1243 * reorganizing state for the final encapsulation.
1244 */
1245 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
1246 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
1247
1248 /*
1249 * Insure space for additional headers. First identify
1250 * transmit key to use in calculating any buffer adjustments
1251 * required. This is also used below to do privacy
1252 * encapsulation work. Then calculate the 802.11 header
1253 * size and any padding required by the driver.
1254 *
1255 * Note key may be NULL if we fall back to the default
1256 * transmit key and that is not set. In that case the
1257 * buffer may not be expanded as needed by the cipher
1258 * routines, but they will/should discard it.
1259 */
1260 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
1261 if (vap->iv_opmode == IEEE80211_M_STA ||
1262 !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
1263 (vap->iv_opmode == IEEE80211_M_WDS &&
1264 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)))
1265 key = ieee80211_crypto_getucastkey(vap, ni);
1266 else
1267 key = ieee80211_crypto_getmcastkey(vap, ni);
1268 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
1269 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
1270 eh.ether_dhost,
1271 "no default transmit key (%s) deftxkey %u",
1272 __func__, vap->iv_def_txkey);
1273 vap->iv_stats.is_tx_nodefkey++;
1274 goto bad;
1275 }
1276 } else
1277 key = NULL;
1278 /*
1279 * XXX Some ap's don't handle QoS-encapsulated EAPOL
1280 * frames so suppress use. This may be an issue if other
1281 * ap's require all data frames to be QoS-encapsulated
1282 * once negotiated in which case we'll need to make this
1283 * configurable.
1284 * NB: mesh data frames are QoS.
1285 */
1286 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) ||
1287 (vap->iv_opmode == IEEE80211_M_MBSS)) &&
1288 (m->m_flags & M_EAPOL) == 0;
1289 if (addqos)
1290 hdrsize = sizeof(struct ieee80211_qosframe);
1291 else
1292 hdrsize = sizeof(struct ieee80211_frame);
1293 #ifdef IEEE80211_SUPPORT_MESH
1294 if (vap->iv_opmode == IEEE80211_M_MBSS) {
1295 /*
1296 * Mesh data frames are encapsulated according to the
1297 * rules of Section 11B.8.5 (p.139 of D3.0 spec).
1298 * o Group Addressed data (aka multicast) originating
1299 * at the local sta are sent w/ 3-address format and
1300 * address extension mode 00
1301 * o Individually Addressed data (aka unicast) originating
1302 * at the local sta are sent w/ 4-address format and
1303 * address extension mode 00
1304 * o Group Addressed data forwarded from a non-mesh sta are
1305 * sent w/ 3-address format and address extension mode 01
1306 * o Individually Address data from another sta are sent
1307 * w/ 4-address format and address extension mode 10
1308 */
1309 is4addr = 0; /* NB: don't use, disable */
1310 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) {
1311 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost);
1312 KASSERT(rt != NULL, ("route is NULL"));
1313 dir = IEEE80211_FC1_DIR_DSTODS;
1314 hdrsize += IEEE80211_ADDR_LEN;
1315 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1316 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate,
1317 vap->iv_myaddr)) {
1318 IEEE80211_NOTE_MAC(vap,
1319 IEEE80211_MSG_MESH,
1320 eh.ether_dhost,
1321 "%s", "trying to send to ourself");
1322 goto bad;
1323 }
1324 meshae = IEEE80211_MESH_AE_10;
1325 meshhdrsize =
1326 sizeof(struct ieee80211_meshcntl_ae10);
1327 } else {
1328 meshae = IEEE80211_MESH_AE_00;
1329 meshhdrsize =
1330 sizeof(struct ieee80211_meshcntl);
1331 }
1332 } else {
1333 dir = IEEE80211_FC1_DIR_FROMDS;
1334 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) {
1335 /* proxy group */
1336 meshae = IEEE80211_MESH_AE_01;
1337 meshhdrsize =
1338 sizeof(struct ieee80211_meshcntl_ae01);
1339 } else {
1340 /* group */
1341 meshae = IEEE80211_MESH_AE_00;
1342 meshhdrsize = sizeof(struct ieee80211_meshcntl);
1343 }
1344 }
1345 } else {
1346 #endif
1347 /*
1348 * 4-address frames need to be generated for:
1349 * o packets sent through a WDS vap (IEEE80211_M_WDS)
1350 * o packets sent through a vap marked for relaying
1351 * (e.g. a station operating with dynamic WDS)
1352 */
1353 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
1354 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
1355 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
1356 if (is4addr)
1357 hdrsize += IEEE80211_ADDR_LEN;
1358 meshhdrsize = meshae = 0;
1359 #ifdef IEEE80211_SUPPORT_MESH
1360 }
1361 #endif
1362 /*
1363 * Honor driver DATAPAD requirement.
1364 */
1365 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1366 hdrspace = roundup(hdrsize, sizeof(uint32_t));
1367 else
1368 hdrspace = hdrsize;
1369
1370 if (__predict_true((m->m_flags & M_FF) == 0)) {
1371 /*
1372 * Normal frame.
1373 */
1374 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m);
1375 if (m == NULL) {
1376 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
1377 goto bad;
1378 }
1379 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
1380 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
1381 llc = mtod(m, struct llc *);
1382 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
1383 llc->llc_control = LLC_UI;
1384 llc->llc_snap.org_code[0] = 0;
1385 llc->llc_snap.org_code[1] = 0;
1386 llc->llc_snap.org_code[2] = 0;
1387 llc->llc_snap.ether_type = eh.ether_type;
1388 } else {
1389 #ifdef IEEE80211_SUPPORT_SUPERG
1390 /*
1391 * Aggregated frame. Check if it's for AMSDU or FF.
1392 *
1393 * XXX TODO: IEEE80211_NODE_AMSDU* isn't implemented
1394 * anywhere for some reason. But, since 11n requires
1395 * AMSDU RX, we can just assume "11n" == "AMSDU".
1396 */
1397 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, "%s: called; M_FF\n", __func__);
1398 if (ieee80211_amsdu_tx_ok(ni)) {
1399 m = ieee80211_amsdu_encap(vap, m, hdrspace + meshhdrsize, key);
1400 is_amsdu = 1;
1401 } else {
1402 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key);
1403 }
1404 if (m == NULL)
1405 #endif
1406 goto bad;
1407 }
1408 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
1409
1410 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT);
1411 if (m == NULL) {
1412 vap->iv_stats.is_tx_nobuf++;
1413 goto bad;
1414 }
1415 wh = mtod(m, struct ieee80211_frame *);
1416 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
1417 *(uint16_t *)wh->i_dur = 0;
1418 qos = NULL; /* NB: quiet compiler */
1419 if (is4addr) {
1420 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1421 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1422 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1423 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1424 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
1425 } else switch (vap->iv_opmode) {
1426 case IEEE80211_M_STA:
1427 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
1428 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
1429 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1430 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1431 break;
1432 case IEEE80211_M_IBSS:
1433 case IEEE80211_M_AHDEMO:
1434 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1435 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1436 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1437 /*
1438 * NB: always use the bssid from iv_bss as the
1439 * neighbor's may be stale after an ibss merge
1440 */
1441 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
1442 break;
1443 case IEEE80211_M_HOSTAP:
1444 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1445 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1446 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
1447 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
1448 break;
1449 #ifdef IEEE80211_SUPPORT_MESH
1450 case IEEE80211_M_MBSS:
1451 /* NB: offset by hdrspace to deal with DATAPAD */
1452 mc = (struct ieee80211_meshcntl_ae10 *)
1453 (mtod(m, uint8_t *) + hdrspace);
1454 wh->i_fc[1] = dir;
1455 switch (meshae) {
1456 case IEEE80211_MESH_AE_00: /* no proxy */
1457 mc->mc_flags = 0;
1458 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */
1459 IEEE80211_ADDR_COPY(wh->i_addr1,
1460 ni->ni_macaddr);
1461 IEEE80211_ADDR_COPY(wh->i_addr2,
1462 vap->iv_myaddr);
1463 IEEE80211_ADDR_COPY(wh->i_addr3,
1464 eh.ether_dhost);
1465 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4,
1466 eh.ether_shost);
1467 qos =((struct ieee80211_qosframe_addr4 *)
1468 wh)->i_qos;
1469 } else if (dir == IEEE80211_FC1_DIR_FROMDS) {
1470 /* mcast */
1471 IEEE80211_ADDR_COPY(wh->i_addr1,
1472 eh.ether_dhost);
1473 IEEE80211_ADDR_COPY(wh->i_addr2,
1474 vap->iv_myaddr);
1475 IEEE80211_ADDR_COPY(wh->i_addr3,
1476 eh.ether_shost);
1477 qos = ((struct ieee80211_qosframe *)
1478 wh)->i_qos;
1479 }
1480 break;
1481 case IEEE80211_MESH_AE_01: /* mcast, proxy */
1482 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1483 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1484 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1485 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr);
1486 mc->mc_flags = 1;
1487 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4,
1488 eh.ether_shost);
1489 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1490 break;
1491 case IEEE80211_MESH_AE_10: /* ucast, proxy */
1492 KASSERT(rt != NULL, ("route is NULL"));
1493 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop);
1494 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1495 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate);
1496 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr);
1497 mc->mc_flags = IEEE80211_MESH_AE_10;
1498 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost);
1499 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost);
1500 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1501 break;
1502 default:
1503 KASSERT(0, ("meshae %d", meshae));
1504 break;
1505 }
1506 mc->mc_ttl = ms->ms_ttl;
1507 ms->ms_seq++;
1508 le32enc(mc->mc_seq, ms->ms_seq);
1509 break;
1510 #endif
1511 case IEEE80211_M_WDS: /* NB: is4addr should always be true */
1512 default:
1513 goto bad;
1514 }
1515 if (m->m_flags & M_MORE_DATA)
1516 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
1517 if (addqos) {
1518 int ac, tid;
1519
1520 if (is4addr) {
1521 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1522 /* NB: mesh case handled earlier */
1523 } else if (vap->iv_opmode != IEEE80211_M_MBSS)
1524 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1525 ac = M_WME_GETAC(m);
1526 /* map from access class/queue to 11e header priorty value */
1527 tid = WME_AC_TO_TID(ac);
1528 qos[0] = tid & IEEE80211_QOS_TID;
1529 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
1530 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
1531 #ifdef IEEE80211_SUPPORT_MESH
1532 if (vap->iv_opmode == IEEE80211_M_MBSS)
1533 qos[1] = IEEE80211_QOS_MC;
1534 else
1535 #endif
1536 qos[1] = 0;
1537 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
1538
1539 /*
1540 * If this is an A-MSDU then ensure we set the
1541 * relevant field.
1542 */
1543 if (is_amsdu)
1544 qos[0] |= IEEE80211_QOS_AMSDU;
1545
1546 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
1547 /*
1548 * NB: don't assign a sequence # to potential
1549 * aggregates; we expect this happens at the
1550 * point the frame comes off any aggregation q
1551 * as otherwise we may introduce holes in the
1552 * BA sequence space and/or make window accouting
1553 * more difficult.
1554 *
1555 * XXX may want to control this with a driver
1556 * capability; this may also change when we pull
1557 * aggregation up into net80211
1558 */
1559 seqno = ni->ni_txseqs[tid]++;
1560 *(uint16_t *)wh->i_seq =
1561 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1562 M_SEQNO_SET(m, seqno);
1563 }
1564 } else {
1565 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
1566 *(uint16_t *)wh->i_seq =
1567 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1568 M_SEQNO_SET(m, seqno);
1569
1570 /*
1571 * XXX TODO: we shouldn't allow EAPOL, etc that would
1572 * be forced to be non-QoS traffic to be A-MSDU encapsulated.
1573 */
1574 if (is_amsdu)
1575 printf("%s: XXX ERROR: is_amsdu set; not QoS!\n",
1576 __func__);
1577 }
1578
1579
1580 /* check if xmit fragmentation is required */
1581 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
1582 !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
1583 (vap->iv_caps & IEEE80211_C_TXFRAG) &&
1584 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
1585 if (key != NULL) {
1586 /*
1587 * IEEE 802.1X: send EAPOL frames always in the clear.
1588 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
1589 */
1590 if ((m->m_flags & M_EAPOL) == 0 ||
1591 ((vap->iv_flags & IEEE80211_F_WPA) &&
1592 (vap->iv_opmode == IEEE80211_M_STA ?
1593 !IEEE80211_KEY_UNDEFINED(key) :
1594 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
1595 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
1596 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
1597 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
1598 eh.ether_dhost,
1599 "%s", "enmic failed, discard frame");
1600 vap->iv_stats.is_crypto_enmicfail++;
1601 goto bad;
1602 }
1603 }
1604 }
1605 if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
1606 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
1607 goto bad;
1608
1609 m->m_flags |= M_ENCAP; /* mark encapsulated */
1610
1611 IEEE80211_NODE_STAT(ni, tx_data);
1612 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1613 IEEE80211_NODE_STAT(ni, tx_mcast);
1614 m->m_flags |= M_MCAST;
1615 } else
1616 IEEE80211_NODE_STAT(ni, tx_ucast);
1617 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
1618
1619 return m;
1620 bad:
1621 if (m != NULL)
1622 m_freem(m);
1623 return NULL;
1624 #undef WH4
1625 #undef MC01
1626 }
1627
1628 void
1629 ieee80211_free_mbuf(struct mbuf *m)
1630 {
1631 struct mbuf *next;
1632
1633 if (m == NULL)
1634 return;
1635
1636 do {
1637 next = m->m_nextpkt;
1638 m->m_nextpkt = NULL;
1639 m_freem(m);
1640 } while ((m = next) != NULL);
1641 }
1642
1643 /*
1644 * Fragment the frame according to the specified mtu.
1645 * The size of the 802.11 header (w/o padding) is provided
1646 * so we don't need to recalculate it. We create a new
1647 * mbuf for each fragment and chain it through m_nextpkt;
1648 * we might be able to optimize this by reusing the original
1649 * packet's mbufs but that is significantly more complicated.
1650 */
1651 static int
1652 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
1653 u_int hdrsize, u_int ciphdrsize, u_int mtu)
1654 {
1655 struct ieee80211com *ic = vap->iv_ic;
1656 struct ieee80211_frame *wh, *whf;
1657 struct mbuf *m, *prev;
1658 u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
1659 u_int hdrspace;
1660
1661 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
1662 KASSERT(m0->m_pkthdr.len > mtu,
1663 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
1664
1665 /*
1666 * Honor driver DATAPAD requirement.
1667 */
1668 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1669 hdrspace = roundup(hdrsize, sizeof(uint32_t));
1670 else
1671 hdrspace = hdrsize;
1672
1673 wh = mtod(m0, struct ieee80211_frame *);
1674 /* NB: mark the first frag; it will be propagated below */
1675 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
1676 totalhdrsize = hdrspace + ciphdrsize;
1677 fragno = 1;
1678 off = mtu - ciphdrsize;
1679 remainder = m0->m_pkthdr.len - off;
1680 prev = m0;
1681 do {
1682 fragsize = MIN(totalhdrsize + remainder, mtu);
1683 m = m_get2(fragsize, M_NOWAIT, MT_DATA, M_PKTHDR);
1684 if (m == NULL)
1685 goto bad;
1686 /* leave room to prepend any cipher header */
1687 m_align(m, fragsize - ciphdrsize);
1688
1689 /*
1690 * Form the header in the fragment. Note that since
1691 * we mark the first fragment with the MORE_FRAG bit
1692 * it automatically is propagated to each fragment; we
1693 * need only clear it on the last fragment (done below).
1694 * NB: frag 1+ dont have Mesh Control field present.
1695 */
1696 whf = mtod(m, struct ieee80211_frame *);
1697 memcpy(whf, wh, hdrsize);
1698 #ifdef IEEE80211_SUPPORT_MESH
1699 if (vap->iv_opmode == IEEE80211_M_MBSS) {
1700 if (IEEE80211_IS_DSTODS(wh))
1701 ((struct ieee80211_qosframe_addr4 *)
1702 whf)->i_qos[1] &= ~IEEE80211_QOS_MC;
1703 else
1704 ((struct ieee80211_qosframe *)
1705 whf)->i_qos[1] &= ~IEEE80211_QOS_MC;
1706 }
1707 #endif
1708 *(uint16_t *)&whf->i_seq[0] |= htole16(
1709 (fragno & IEEE80211_SEQ_FRAG_MASK) <<
1710 IEEE80211_SEQ_FRAG_SHIFT);
1711 fragno++;
1712
1713 payload = fragsize - totalhdrsize;
1714 /* NB: destination is known to be contiguous */
1715
1716 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace);
1717 m->m_len = hdrspace + payload;
1718 m->m_pkthdr.len = hdrspace + payload;
1719 m->m_flags |= M_FRAG;
1720
1721 /* chain up the fragment */
1722 prev->m_nextpkt = m;
1723 prev = m;
1724
1725 /* deduct fragment just formed */
1726 remainder -= payload;
1727 off += payload;
1728 } while (remainder != 0);
1729
1730 /* set the last fragment */
1731 m->m_flags |= M_LASTFRAG;
1732 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
1733
1734 /* strip first mbuf now that everything has been copied */
1735 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
1736 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1737
1738 vap->iv_stats.is_tx_fragframes++;
1739 vap->iv_stats.is_tx_frags += fragno-1;
1740
1741 return 1;
1742 bad:
1743 /* reclaim fragments but leave original frame for caller to free */
1744 ieee80211_free_mbuf(m0->m_nextpkt);
1745 m0->m_nextpkt = NULL;
1746 return 0;
1747 }
1748
1749 /*
1750 * Add a supported rates element id to a frame.
1751 */
1752 uint8_t *
1753 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
1754 {
1755 int nrates;
1756
1757 *frm++ = IEEE80211_ELEMID_RATES;
1758 nrates = rs->rs_nrates;
1759 if (nrates > IEEE80211_RATE_SIZE)
1760 nrates = IEEE80211_RATE_SIZE;
1761 *frm++ = nrates;
1762 memcpy(frm, rs->rs_rates, nrates);
1763 return frm + nrates;
1764 }
1765
1766 /*
1767 * Add an extended supported rates element id to a frame.
1768 */
1769 uint8_t *
1770 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
1771 {
1772 /*
1773 * Add an extended supported rates element if operating in 11g mode.
1774 */
1775 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
1776 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
1777 *frm++ = IEEE80211_ELEMID_XRATES;
1778 *frm++ = nrates;
1779 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
1780 frm += nrates;
1781 }
1782 return frm;
1783 }
1784
1785 /*
1786 * Add an ssid element to a frame.
1787 */
1788 uint8_t *
1789 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
1790 {
1791 *frm++ = IEEE80211_ELEMID_SSID;
1792 *frm++ = len;
1793 memcpy(frm, ssid, len);
1794 return frm + len;
1795 }
1796
1797 /*
1798 * Add an erp element to a frame.
1799 */
1800 static uint8_t *
1801 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
1802 {
1803 uint8_t erp;
1804
1805 *frm++ = IEEE80211_ELEMID_ERP;
1806 *frm++ = 1;
1807 erp = 0;
1808 if (ic->ic_nonerpsta != 0)
1809 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
1810 if (ic->ic_flags & IEEE80211_F_USEPROT)
1811 erp |= IEEE80211_ERP_USE_PROTECTION;
1812 if (ic->ic_flags & IEEE80211_F_USEBARKER)
1813 erp |= IEEE80211_ERP_LONG_PREAMBLE;
1814 *frm++ = erp;
1815 return frm;
1816 }
1817
1818 /*
1819 * Add a CFParams element to a frame.
1820 */
1821 static uint8_t *
1822 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
1823 {
1824 #define ADDSHORT(frm, v) do { \
1825 le16enc(frm, v); \
1826 frm += 2; \
1827 } while (0)
1828 *frm++ = IEEE80211_ELEMID_CFPARMS;
1829 *frm++ = 6;
1830 *frm++ = 0; /* CFP count */
1831 *frm++ = 2; /* CFP period */
1832 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */
1833 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */
1834 return frm;
1835 #undef ADDSHORT
1836 }
1837
1838 static __inline uint8_t *
1839 add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
1840 {
1841 memcpy(frm, ie->ie_data, ie->ie_len);
1842 return frm + ie->ie_len;
1843 }
1844
1845 static __inline uint8_t *
1846 add_ie(uint8_t *frm, const uint8_t *ie)
1847 {
1848 memcpy(frm, ie, 2 + ie[1]);
1849 return frm + 2 + ie[1];
1850 }
1851
1852 #define WME_OUI_BYTES 0x00, 0x50, 0xf2
1853 /*
1854 * Add a WME information element to a frame.
1855 */
1856 uint8_t *
1857 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
1858 {
1859 static const struct ieee80211_wme_info info = {
1860 .wme_id = IEEE80211_ELEMID_VENDOR,
1861 .wme_len = sizeof(struct ieee80211_wme_info) - 2,
1862 .wme_oui = { WME_OUI_BYTES },
1863 .wme_type = WME_OUI_TYPE,
1864 .wme_subtype = WME_INFO_OUI_SUBTYPE,
1865 .wme_version = WME_VERSION,
1866 .wme_info = 0,
1867 };
1868 memcpy(frm, &info, sizeof(info));
1869 return frm + sizeof(info);
1870 }
1871
1872 /*
1873 * Add a WME parameters element to a frame.
1874 */
1875 static uint8_t *
1876 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
1877 {
1878 #define SM(_v, _f) (((_v) << _f##_S) & _f)
1879 #define ADDSHORT(frm, v) do { \
1880 le16enc(frm, v); \
1881 frm += 2; \
1882 } while (0)
1883 /* NB: this works 'cuz a param has an info at the front */
1884 static const struct ieee80211_wme_info param = {
1885 .wme_id = IEEE80211_ELEMID_VENDOR,
1886 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
1887 .wme_oui = { WME_OUI_BYTES },
1888 .wme_type = WME_OUI_TYPE,
1889 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
1890 .wme_version = WME_VERSION,
1891 };
1892 int i;
1893
1894 memcpy(frm, &param, sizeof(param));
1895 frm += __offsetof(struct ieee80211_wme_info, wme_info);
1896 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */
1897 *frm++ = 0; /* reserved field */
1898 for (i = 0; i < WME_NUM_AC; i++) {
1899 const struct wmeParams *ac =
1900 &wme->wme_bssChanParams.cap_wmeParams[i];
1901 *frm++ = SM(i, WME_PARAM_ACI)
1902 | SM(ac->wmep_acm, WME_PARAM_ACM)
1903 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
1904 ;
1905 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
1906 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
1907 ;
1908 ADDSHORT(frm, ac->wmep_txopLimit);
1909 }
1910 return frm;
1911 #undef SM
1912 #undef ADDSHORT
1913 }
1914 #undef WME_OUI_BYTES
1915
1916 /*
1917 * Add an 11h Power Constraint element to a frame.
1918 */
1919 static uint8_t *
1920 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
1921 {
1922 const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
1923 /* XXX per-vap tx power limit? */
1924 int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
1925
1926 frm[0] = IEEE80211_ELEMID_PWRCNSTR;
1927 frm[1] = 1;
1928 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0;
1929 return frm + 3;
1930 }
1931
1932 /*
1933 * Add an 11h Power Capability element to a frame.
1934 */
1935 static uint8_t *
1936 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
1937 {
1938 frm[0] = IEEE80211_ELEMID_PWRCAP;
1939 frm[1] = 2;
1940 frm[2] = c->ic_minpower;
1941 frm[3] = c->ic_maxpower;
1942 return frm + 4;
1943 }
1944
1945 /*
1946 * Add an 11h Supported Channels element to a frame.
1947 */
1948 static uint8_t *
1949 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
1950 {
1951 static const int ielen = 26;
1952
1953 frm[0] = IEEE80211_ELEMID_SUPPCHAN;
1954 frm[1] = ielen;
1955 /* XXX not correct */
1956 memcpy(frm+2, ic->ic_chan_avail, ielen);
1957 return frm + 2 + ielen;
1958 }
1959
1960 /*
1961 * Add an 11h Quiet time element to a frame.
1962 */
1963 static uint8_t *
1964 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap)
1965 {
1966 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm;
1967
1968 quiet->quiet_ie = IEEE80211_ELEMID_QUIET;
1969 quiet->len = 6;
1970 if (vap->iv_quiet_count_value == 1)
1971 vap->iv_quiet_count_value = vap->iv_quiet_count;
1972 else if (vap->iv_quiet_count_value > 1)
1973 vap->iv_quiet_count_value--;
1974
1975 if (vap->iv_quiet_count_value == 0) {
1976 /* value 0 is reserved as per 802.11h standerd */
1977 vap->iv_quiet_count_value = 1;
1978 }
1979
1980 quiet->tbttcount = vap->iv_quiet_count_value;
1981 quiet->period = vap->iv_quiet_period;
1982 quiet->duration = htole16(vap->iv_quiet_duration);
1983 quiet->offset = htole16(vap->iv_quiet_offset);
1984 return frm + sizeof(*quiet);
1985 }
1986
1987 /*
1988 * Add an 11h Channel Switch Announcement element to a frame.
1989 * Note that we use the per-vap CSA count to adjust the global
1990 * counter so we can use this routine to form probe response
1991 * frames and get the current count.
1992 */
1993 static uint8_t *
1994 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
1995 {
1996 struct ieee80211com *ic = vap->iv_ic;
1997 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
1998
1999 csa->csa_ie = IEEE80211_ELEMID_CSA;
2000 csa->csa_len = 3;
2001 csa->csa_mode = 1; /* XXX force quiet on channel */
2002 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
2003 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
2004 return frm + sizeof(*csa);
2005 }
2006
2007 /*
2008 * Add an 11h country information element to a frame.
2009 */
2010 static uint8_t *
2011 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
2012 {
2013
2014 if (ic->ic_countryie == NULL ||
2015 ic->ic_countryie_chan != ic->ic_bsschan) {
2016 /*
2017 * Handle lazy construction of ie. This is done on
2018 * first use and after a channel change that requires
2019 * re-calculation.
2020 */
2021 if (ic->ic_countryie != NULL)
2022 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
2023 ic->ic_countryie = ieee80211_alloc_countryie(ic);
2024 if (ic->ic_countryie == NULL)
2025 return frm;
2026 ic->ic_countryie_chan = ic->ic_bsschan;
2027 }
2028 return add_appie(frm, ic->ic_countryie);
2029 }
2030
2031 uint8_t *
2032 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap)
2033 {
2034 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL)
2035 return (add_ie(frm, vap->iv_wpa_ie));
2036 else {
2037 /* XXX else complain? */
2038 return (frm);
2039 }
2040 }
2041
2042 uint8_t *
2043 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap)
2044 {
2045 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL)
2046 return (add_ie(frm, vap->iv_rsn_ie));
2047 else {
2048 /* XXX else complain? */
2049 return (frm);
2050 }
2051 }
2052
2053 uint8_t *
2054 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni)
2055 {
2056 if (ni->ni_flags & IEEE80211_NODE_QOS) {
2057 *frm++ = IEEE80211_ELEMID_QOS;
2058 *frm++ = 1;
2059 *frm++ = 0;
2060 }
2061
2062 return (frm);
2063 }
2064
2065 /*
2066 * Send a probe request frame with the specified ssid
2067 * and any optional information element data.
2068 */
2069 int
2070 ieee80211_send_probereq(struct ieee80211_node *ni,
2071 const uint8_t sa[IEEE80211_ADDR_LEN],
2072 const uint8_t da[IEEE80211_ADDR_LEN],
2073 const uint8_t bssid[IEEE80211_ADDR_LEN],
2074 const uint8_t *ssid, size_t ssidlen)
2075 {
2076 struct ieee80211vap *vap = ni->ni_vap;
2077 struct ieee80211com *ic = ni->ni_ic;
2078 const struct ieee80211_txparam *tp;
2079 struct ieee80211_bpf_params params;
2080 const struct ieee80211_rateset *rs;
2081 struct mbuf *m;
2082 uint8_t *frm;
2083 int ret;
2084
2085 if (vap->iv_state == IEEE80211_S_CAC) {
2086 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
2087 "block %s frame in CAC state", "probe request");
2088 vap->iv_stats.is_tx_badstate++;
2089 return EIO; /* XXX */
2090 }
2091
2092 /*
2093 * Hold a reference on the node so it doesn't go away until after
2094 * the xmit is complete all the way in the driver. On error we
2095 * will remove our reference.
2096 */
2097 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2098 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2099 __func__, __LINE__,
2100 ni, ether_sprintf(ni->ni_macaddr),
2101 ieee80211_node_refcnt(ni)+1);
2102 ieee80211_ref_node(ni);
2103
2104 /*
2105 * prreq frame format
2106 * [tlv] ssid
2107 * [tlv] supported rates
2108 * [tlv] RSN (optional)
2109 * [tlv] extended supported rates
2110 * [tlv] WPA (optional)
2111 * [tlv] user-specified ie's
2112 */
2113 m = ieee80211_getmgtframe(&frm,
2114 ic->ic_headroom + sizeof(struct ieee80211_frame),
2115 2 + IEEE80211_NWID_LEN
2116 + 2 + IEEE80211_RATE_SIZE
2117 + sizeof(struct ieee80211_ie_wpa)
2118 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2119 + sizeof(struct ieee80211_ie_wpa)
2120 + (vap->iv_appie_probereq != NULL ?
2121 vap->iv_appie_probereq->ie_len : 0)
2122 );
2123 if (m == NULL) {
2124 vap->iv_stats.is_tx_nobuf++;
2125 ieee80211_free_node(ni);
2126 return ENOMEM;
2127 }
2128
2129 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
2130 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
2131 frm = ieee80211_add_rates(frm, rs);
2132 frm = ieee80211_add_rsn(frm, vap);
2133 frm = ieee80211_add_xrates(frm, rs);
2134 frm = ieee80211_add_wpa(frm, vap);
2135 if (vap->iv_appie_probereq != NULL)
2136 frm = add_appie(frm, vap->iv_appie_probereq);
2137 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2138
2139 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
2140 ("leading space %zd", M_LEADINGSPACE(m)));
2141 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
2142 if (m == NULL) {
2143 /* NB: cannot happen */
2144 ieee80211_free_node(ni);
2145 return ENOMEM;
2146 }
2147
2148 IEEE80211_TX_LOCK(ic);
2149 ieee80211_send_setup(ni, m,
2150 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
2151 IEEE80211_NONQOS_TID, sa, da, bssid);
2152 /* XXX power management? */
2153 m->m_flags |= M_ENCAP; /* mark encapsulated */
2154
2155 M_WME_SETAC(m, WME_AC_BE);
2156
2157 IEEE80211_NODE_STAT(ni, tx_probereq);
2158 IEEE80211_NODE_STAT(ni, tx_mgmt);
2159
2160 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
2161 "send probe req on channel %u bssid %s ssid \"%.*s\"\n",
2162 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid),
2163 ssidlen, ssid);
2164
2165 memset(&params, 0, sizeof(params));
2166 params.ibp_pri = M_WME_GETAC(m);
2167 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
2168 params.ibp_rate0 = tp->mgmtrate;
2169 if (IEEE80211_IS_MULTICAST(da)) {
2170 params.ibp_flags |= IEEE80211_BPF_NOACK;
2171 params.ibp_try0 = 1;
2172 } else
2173 params.ibp_try0 = tp->maxretry;
2174 params.ibp_power = ni->ni_txpower;
2175 ret = ieee80211_raw_output(vap, ni, m, &params);
2176 IEEE80211_TX_UNLOCK(ic);
2177 return (ret);
2178 }
2179
2180 /*
2181 * Calculate capability information for mgt frames.
2182 */
2183 uint16_t
2184 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
2185 {
2186 struct ieee80211com *ic = vap->iv_ic;
2187 uint16_t capinfo;
2188
2189 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
2190
2191 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
2192 capinfo = IEEE80211_CAPINFO_ESS;
2193 else if (vap->iv_opmode == IEEE80211_M_IBSS)
2194 capinfo = IEEE80211_CAPINFO_IBSS;
2195 else
2196 capinfo = 0;
2197 if (vap->iv_flags & IEEE80211_F_PRIVACY)
2198 capinfo |= IEEE80211_CAPINFO_PRIVACY;
2199 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
2200 IEEE80211_IS_CHAN_2GHZ(chan))
2201 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
2202 if (ic->ic_flags & IEEE80211_F_SHSLOT)
2203 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
2204 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
2205 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
2206 return capinfo;
2207 }
2208
2209 /*
2210 * Send a management frame. The node is for the destination (or ic_bss
2211 * when in station mode). Nodes other than ic_bss have their reference
2212 * count bumped to reflect our use for an indeterminant time.
2213 */
2214 int
2215 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
2216 {
2217 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
2218 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2219 struct ieee80211vap *vap = ni->ni_vap;
2220 struct ieee80211com *ic = ni->ni_ic;
2221 struct ieee80211_node *bss = vap->iv_bss;
2222 struct ieee80211_bpf_params params;
2223 struct mbuf *m;
2224 uint8_t *frm;
2225 uint16_t capinfo;
2226 int has_challenge, is_shared_key, ret, status;
2227
2228 KASSERT(ni != NULL, ("null node"));
2229
2230 /*
2231 * Hold a reference on the node so it doesn't go away until after
2232 * the xmit is complete all the way in the driver. On error we
2233 * will remove our reference.
2234 */
2235 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2236 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2237 __func__, __LINE__,
2238 ni, ether_sprintf(ni->ni_macaddr),
2239 ieee80211_node_refcnt(ni)+1);
2240 ieee80211_ref_node(ni);
2241
2242 memset(&params, 0, sizeof(params));
2243 switch (type) {
2244
2245 case IEEE80211_FC0_SUBTYPE_AUTH:
2246 status = arg >> 16;
2247 arg &= 0xffff;
2248 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
2249 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
2250 ni->ni_challenge != NULL);
2251
2252 /*
2253 * Deduce whether we're doing open authentication or
2254 * shared key authentication. We do the latter if
2255 * we're in the middle of a shared key authentication
2256 * handshake or if we're initiating an authentication
2257 * request and configured to use shared key.
2258 */
2259 is_shared_key = has_challenge ||
2260 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
2261 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
2262 bss->ni_authmode == IEEE80211_AUTH_SHARED);
2263
2264 m = ieee80211_getmgtframe(&frm,
2265 ic->ic_headroom + sizeof(struct ieee80211_frame),
2266 3 * sizeof(uint16_t)
2267 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
2268 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
2269 );
2270 if (m == NULL)
2271 senderr(ENOMEM, is_tx_nobuf);
2272
2273 ((uint16_t *)frm)[0] =
2274 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
2275 : htole16(IEEE80211_AUTH_ALG_OPEN);
2276 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
2277 ((uint16_t *)frm)[2] = htole16(status);/* status */
2278
2279 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
2280 ((uint16_t *)frm)[3] =
2281 htole16((IEEE80211_CHALLENGE_LEN << 8) |
2282 IEEE80211_ELEMID_CHALLENGE);
2283 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
2284 IEEE80211_CHALLENGE_LEN);
2285 m->m_pkthdr.len = m->m_len =
2286 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
2287 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
2288 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2289 "request encrypt frame (%s)", __func__);
2290 /* mark frame for encryption */
2291 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
2292 }
2293 } else
2294 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
2295
2296 /* XXX not right for shared key */
2297 if (status == IEEE80211_STATUS_SUCCESS)
2298 IEEE80211_NODE_STAT(ni, tx_auth);
2299 else
2300 IEEE80211_NODE_STAT(ni, tx_auth_fail);
2301
2302 if (vap->iv_opmode == IEEE80211_M_STA)
2303 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
2304 (void *) vap->iv_state);
2305 break;
2306
2307 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2308 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2309 "send station deauthenticate (reason: %d (%s))", arg,
2310 ieee80211_reason_to_string(arg));
2311 m = ieee80211_getmgtframe(&frm,
2312 ic->ic_headroom + sizeof(struct ieee80211_frame),
2313 sizeof(uint16_t));
2314 if (m == NULL)
2315 senderr(ENOMEM, is_tx_nobuf);
2316 *(uint16_t *)frm = htole16(arg); /* reason */
2317 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
2318
2319 IEEE80211_NODE_STAT(ni, tx_deauth);
2320 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
2321
2322 ieee80211_node_unauthorize(ni); /* port closed */
2323 break;
2324
2325 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2326 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2327 /*
2328 * asreq frame format
2329 * [2] capability information
2330 * [2] listen interval
2331 * [6*] current AP address (reassoc only)
2332 * [tlv] ssid
2333 * [tlv] supported rates
2334 * [tlv] extended supported rates
2335 * [4] power capability (optional)
2336 * [28] supported channels (optional)
2337 * [tlv] HT capabilities
2338 * [tlv] WME (optional)
2339 * [tlv] Vendor OUI HT capabilities (optional)
2340 * [tlv] Atheros capabilities (if negotiated)
2341 * [tlv] AppIE's (optional)
2342 */
2343 m = ieee80211_getmgtframe(&frm,
2344 ic->ic_headroom + sizeof(struct ieee80211_frame),
2345 sizeof(uint16_t)
2346 + sizeof(uint16_t)
2347 + IEEE80211_ADDR_LEN
2348 + 2 + IEEE80211_NWID_LEN
2349 + 2 + IEEE80211_RATE_SIZE
2350 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2351 + 4
2352 + 2 + 26
2353 + sizeof(struct ieee80211_wme_info)
2354 + sizeof(struct ieee80211_ie_htcap)
2355 + 4 + sizeof(struct ieee80211_ie_htcap)
2356 #ifdef IEEE80211_SUPPORT_SUPERG
2357 + sizeof(struct ieee80211_ath_ie)
2358 #endif
2359 + (vap->iv_appie_wpa != NULL ?
2360 vap->iv_appie_wpa->ie_len : 0)
2361 + (vap->iv_appie_assocreq != NULL ?
2362 vap->iv_appie_assocreq->ie_len : 0)
2363 );
2364 if (m == NULL)
2365 senderr(ENOMEM, is_tx_nobuf);
2366
2367 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
2368 ("wrong mode %u", vap->iv_opmode));
2369 capinfo = IEEE80211_CAPINFO_ESS;
2370 if (vap->iv_flags & IEEE80211_F_PRIVACY)
2371 capinfo |= IEEE80211_CAPINFO_PRIVACY;
2372 /*
2373 * NB: Some 11a AP's reject the request when
2374 * short premable is set.
2375 */
2376 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
2377 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
2378 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
2379 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
2380 (ic->ic_caps & IEEE80211_C_SHSLOT))
2381 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
2382 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
2383 (vap->iv_flags & IEEE80211_F_DOTH))
2384 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
2385 *(uint16_t *)frm = htole16(capinfo);
2386 frm += 2;
2387
2388 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
2389 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
2390 bss->ni_intval));
2391 frm += 2;
2392
2393 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2394 IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
2395 frm += IEEE80211_ADDR_LEN;
2396 }
2397
2398 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
2399 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2400 frm = ieee80211_add_rsn(frm, vap);
2401 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2402 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
2403 frm = ieee80211_add_powercapability(frm,
2404 ic->ic_curchan);
2405 frm = ieee80211_add_supportedchannels(frm, ic);
2406 }
2407
2408 /*
2409 * Check the channel - we may be using an 11n NIC with an
2410 * 11n capable station, but we're configured to be an 11b
2411 * channel.
2412 */
2413 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2414 IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
2415 ni->ni_ies.htcap_ie != NULL &&
2416 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) {
2417 frm = ieee80211_add_htcap(frm, ni);
2418 }
2419 frm = ieee80211_add_wpa(frm, vap);
2420 if ((ic->ic_flags & IEEE80211_F_WME) &&
2421 ni->ni_ies.wme_ie != NULL)
2422 frm = ieee80211_add_wme_info(frm, &ic->ic_wme);
2423
2424 /*
2425 * Same deal - only send HT info if we're on an 11n
2426 * capable channel.
2427 */
2428 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2429 IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
2430 ni->ni_ies.htcap_ie != NULL &&
2431 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) {
2432 frm = ieee80211_add_htcap_vendor(frm, ni);
2433 }
2434 #ifdef IEEE80211_SUPPORT_SUPERG
2435 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) {
2436 frm = ieee80211_add_ath(frm,
2437 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
2438 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
2439 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
2440 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
2441 }
2442 #endif /* IEEE80211_SUPPORT_SUPERG */
2443 if (vap->iv_appie_assocreq != NULL)
2444 frm = add_appie(frm, vap->iv_appie_assocreq);
2445 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2446
2447 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
2448 (void *) vap->iv_state);
2449 break;
2450
2451 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2452 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2453 /*
2454 * asresp frame format
2455 * [2] capability information
2456 * [2] status
2457 * [2] association ID
2458 * [tlv] supported rates
2459 * [tlv] extended supported rates
2460 * [tlv] HT capabilities (standard, if STA enabled)
2461 * [tlv] HT information (standard, if STA enabled)
2462 * [tlv] WME (if configured and STA enabled)
2463 * [tlv] HT capabilities (vendor OUI, if STA enabled)
2464 * [tlv] HT information (vendor OUI, if STA enabled)
2465 * [tlv] Atheros capabilities (if STA enabled)
2466 * [tlv] AppIE's (optional)
2467 */
2468 m = ieee80211_getmgtframe(&frm,
2469 ic->ic_headroom + sizeof(struct ieee80211_frame),
2470 sizeof(uint16_t)
2471 + sizeof(uint16_t)
2472 + sizeof(uint16_t)
2473 + 2 + IEEE80211_RATE_SIZE
2474 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2475 + sizeof(struct ieee80211_ie_htcap) + 4
2476 + sizeof(struct ieee80211_ie_htinfo) + 4
2477 + sizeof(struct ieee80211_wme_param)
2478 #ifdef IEEE80211_SUPPORT_SUPERG
2479 + sizeof(struct ieee80211_ath_ie)
2480 #endif
2481 + (vap->iv_appie_assocresp != NULL ?
2482 vap->iv_appie_assocresp->ie_len : 0)
2483 );
2484 if (m == NULL)
2485 senderr(ENOMEM, is_tx_nobuf);
2486
2487 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
2488 *(uint16_t *)frm = htole16(capinfo);
2489 frm += 2;
2490
2491 *(uint16_t *)frm = htole16(arg); /* status */
2492 frm += 2;
2493
2494 if (arg == IEEE80211_STATUS_SUCCESS) {
2495 *(uint16_t *)frm = htole16(ni->ni_associd);
2496 IEEE80211_NODE_STAT(ni, tx_assoc);
2497 } else
2498 IEEE80211_NODE_STAT(ni, tx_assoc_fail);
2499 frm += 2;
2500
2501 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2502 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2503 /* NB: respond according to what we received */
2504 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) {
2505 frm = ieee80211_add_htcap(frm, ni);
2506 frm = ieee80211_add_htinfo(frm, ni);
2507 }
2508 if ((vap->iv_flags & IEEE80211_F_WME) &&
2509 ni->ni_ies.wme_ie != NULL)
2510 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
2511 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) {
2512 frm = ieee80211_add_htcap_vendor(frm, ni);
2513 frm = ieee80211_add_htinfo_vendor(frm, ni);
2514 }
2515 #ifdef IEEE80211_SUPPORT_SUPERG
2516 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS))
2517 frm = ieee80211_add_ath(frm,
2518 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
2519 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
2520 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
2521 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
2522 #endif /* IEEE80211_SUPPORT_SUPERG */
2523 if (vap->iv_appie_assocresp != NULL)
2524 frm = add_appie(frm, vap->iv_appie_assocresp);
2525 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2526 break;
2527
2528 case IEEE80211_FC0_SUBTYPE_DISASSOC:
2529 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2530 "send station disassociate (reason: %d (%s))", arg,
2531 ieee80211_reason_to_string(arg));
2532 m = ieee80211_getmgtframe(&frm,
2533 ic->ic_headroom + sizeof(struct ieee80211_frame),
2534 sizeof(uint16_t));
2535 if (m == NULL)
2536 senderr(ENOMEM, is_tx_nobuf);
2537 *(uint16_t *)frm = htole16(arg); /* reason */
2538 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
2539
2540 IEEE80211_NODE_STAT(ni, tx_disassoc);
2541 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
2542 break;
2543
2544 default:
2545 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
2546 "invalid mgmt frame type %u", type);
2547 senderr(EINVAL, is_tx_unknownmgt);
2548 /* NOTREACHED */
2549 }
2550
2551 /* NB: force non-ProbeResp frames to the highest queue */
2552 params.ibp_pri = WME_AC_VO;
2553 params.ibp_rate0 = bss->ni_txparms->mgmtrate;
2554 /* NB: we know all frames are unicast */
2555 params.ibp_try0 = bss->ni_txparms->maxretry;
2556 params.ibp_power = bss->ni_txpower;
2557 return ieee80211_mgmt_output(ni, m, type, &params);
2558 bad:
2559 ieee80211_free_node(ni);
2560 return ret;
2561 #undef senderr
2562 #undef HTFLAGS
2563 }
2564
2565 /*
2566 * Return an mbuf with a probe response frame in it.
2567 * Space is left to prepend and 802.11 header at the
2568 * front but it's left to the caller to fill in.
2569 */
2570 struct mbuf *
2571 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy)
2572 {
2573 struct ieee80211vap *vap = bss->ni_vap;
2574 struct ieee80211com *ic = bss->ni_ic;
2575 const struct ieee80211_rateset *rs;
2576 struct mbuf *m;
2577 uint16_t capinfo;
2578 uint8_t *frm;
2579
2580 /*
2581 * probe response frame format
2582 * [8] time stamp
2583 * [2] beacon interval
2584 * [2] cabability information
2585 * [tlv] ssid
2586 * [tlv] supported rates
2587 * [tlv] parameter set (FH/DS)
2588 * [tlv] parameter set (IBSS)
2589 * [tlv] country (optional)
2590 * [3] power control (optional)
2591 * [5] channel switch announcement (CSA) (optional)
2592 * [tlv] extended rate phy (ERP)
2593 * [tlv] extended supported rates
2594 * [tlv] RSN (optional)
2595 * [tlv] HT capabilities
2596 * [tlv] HT information
2597 * [tlv] WPA (optional)
2598 * [tlv] WME (optional)
2599 * [tlv] Vendor OUI HT capabilities (optional)
2600 * [tlv] Vendor OUI HT information (optional)
2601 * [tlv] Atheros capabilities
2602 * [tlv] AppIE's (optional)
2603 * [tlv] Mesh ID (MBSS)
2604 * [tlv] Mesh Conf (MBSS)
2605 */
2606 m = ieee80211_getmgtframe(&frm,
2607 ic->ic_headroom + sizeof(struct ieee80211_frame),
2608 8
2609 + sizeof(uint16_t)
2610 + sizeof(uint16_t)
2611 + 2 + IEEE80211_NWID_LEN
2612 + 2 + IEEE80211_RATE_SIZE
2613 + 7 /* max(7,3) */
2614 + IEEE80211_COUNTRY_MAX_SIZE
2615 + 3
2616 + sizeof(struct ieee80211_csa_ie)
2617 + sizeof(struct ieee80211_quiet_ie)
2618 + 3
2619 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2620 + sizeof(struct ieee80211_ie_wpa)
2621 + sizeof(struct ieee80211_ie_htcap)
2622 + sizeof(struct ieee80211_ie_htinfo)
2623 + sizeof(struct ieee80211_ie_wpa)
2624 + sizeof(struct ieee80211_wme_param)
2625 + 4 + sizeof(struct ieee80211_ie_htcap)
2626 + 4 + sizeof(struct ieee80211_ie_htinfo)
2627 #ifdef IEEE80211_SUPPORT_SUPERG
2628 + sizeof(struct ieee80211_ath_ie)
2629 #endif
2630 #ifdef IEEE80211_SUPPORT_MESH
2631 + 2 + IEEE80211_MESHID_LEN
2632 + sizeof(struct ieee80211_meshconf_ie)
2633 #endif
2634 + (vap->iv_appie_proberesp != NULL ?
2635 vap->iv_appie_proberesp->ie_len : 0)
2636 );
2637 if (m == NULL) {
2638 vap->iv_stats.is_tx_nobuf++;
2639 return NULL;
2640 }
2641
2642 memset(frm, 0, 8); /* timestamp should be filled later */
2643 frm += 8;
2644 *(uint16_t *)frm = htole16(bss->ni_intval);
2645 frm += 2;
2646 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
2647 *(uint16_t *)frm = htole16(capinfo);
2648 frm += 2;
2649
2650 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen);
2651 rs = ieee80211_get_suprates(ic, bss->ni_chan);
2652 frm = ieee80211_add_rates(frm, rs);
2653
2654 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) {
2655 *frm++ = IEEE80211_ELEMID_FHPARMS;
2656 *frm++ = 5;
2657 *frm++ = bss->ni_fhdwell & 0x00ff;
2658 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff;
2659 *frm++ = IEEE80211_FH_CHANSET(
2660 ieee80211_chan2ieee(ic, bss->ni_chan));
2661 *frm++ = IEEE80211_FH_CHANPAT(
2662 ieee80211_chan2ieee(ic, bss->ni_chan));
2663 *frm++ = bss->ni_fhindex;
2664 } else {
2665 *frm++ = IEEE80211_ELEMID_DSPARMS;
2666 *frm++ = 1;
2667 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan);
2668 }
2669
2670 if (vap->iv_opmode == IEEE80211_M_IBSS) {
2671 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
2672 *frm++ = 2;
2673 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
2674 }
2675 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
2676 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
2677 frm = ieee80211_add_countryie(frm, ic);
2678 if (vap->iv_flags & IEEE80211_F_DOTH) {
2679 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan))
2680 frm = ieee80211_add_powerconstraint(frm, vap);
2681 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
2682 frm = ieee80211_add_csa(frm, vap);
2683 }
2684 if (vap->iv_flags & IEEE80211_F_DOTH) {
2685 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
2686 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
2687 if (vap->iv_quiet)
2688 frm = ieee80211_add_quiet(frm, vap);
2689 }
2690 }
2691 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan))
2692 frm = ieee80211_add_erp(frm, ic);
2693 frm = ieee80211_add_xrates(frm, rs);
2694 frm = ieee80211_add_rsn(frm, vap);
2695 /*
2696 * NB: legacy 11b clients do not get certain ie's.
2697 * The caller identifies such clients by passing
2698 * a token in legacy to us. Could expand this to be
2699 * any legacy client for stuff like HT ie's.
2700 */
2701 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
2702 legacy != IEEE80211_SEND_LEGACY_11B) {
2703 frm = ieee80211_add_htcap(frm, bss);
2704 frm = ieee80211_add_htinfo(frm, bss);
2705 }
2706 frm = ieee80211_add_wpa(frm, vap);
2707 if (vap->iv_flags & IEEE80211_F_WME)
2708 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
2709 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
2710 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) &&
2711 legacy != IEEE80211_SEND_LEGACY_11B) {
2712 frm = ieee80211_add_htcap_vendor(frm, bss);
2713 frm = ieee80211_add_htinfo_vendor(frm, bss);
2714 }
2715 #ifdef IEEE80211_SUPPORT_SUPERG
2716 if ((vap->iv_flags & IEEE80211_F_ATHEROS) &&
2717 legacy != IEEE80211_SEND_LEGACY_11B)
2718 frm = ieee80211_add_athcaps(frm, bss);
2719 #endif
2720 if (vap->iv_appie_proberesp != NULL)
2721 frm = add_appie(frm, vap->iv_appie_proberesp);
2722 #ifdef IEEE80211_SUPPORT_MESH
2723 if (vap->iv_opmode == IEEE80211_M_MBSS) {
2724 frm = ieee80211_add_meshid(frm, vap);
2725 frm = ieee80211_add_meshconf(frm, vap);
2726 }
2727 #endif
2728 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2729
2730 return m;
2731 }
2732
2733 /*
2734 * Send a probe response frame to the specified mac address.
2735 * This does not go through the normal mgt frame api so we
2736 * can specify the destination address and re-use the bss node
2737 * for the sta reference.
2738 */
2739 int
2740 ieee80211_send_proberesp(struct ieee80211vap *vap,
2741 const uint8_t da[IEEE80211_ADDR_LEN], int legacy)
2742 {
2743 struct ieee80211_node *bss = vap->iv_bss;
2744 struct ieee80211com *ic = vap->iv_ic;
2745 struct mbuf *m;
2746 int ret;
2747
2748 if (vap->iv_state == IEEE80211_S_CAC) {
2749 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss,
2750 "block %s frame in CAC state", "probe response");
2751 vap->iv_stats.is_tx_badstate++;
2752 return EIO; /* XXX */
2753 }
2754
2755 /*
2756 * Hold a reference on the node so it doesn't go away until after
2757 * the xmit is complete all the way in the driver. On error we
2758 * will remove our reference.
2759 */
2760 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2761 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2762 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr),
2763 ieee80211_node_refcnt(bss)+1);
2764 ieee80211_ref_node(bss);
2765
2766 m = ieee80211_alloc_proberesp(bss, legacy);
2767 if (m == NULL) {
2768 ieee80211_free_node(bss);
2769 return ENOMEM;
2770 }
2771
2772 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
2773 KASSERT(m != NULL, ("no room for header"));
2774
2775 IEEE80211_TX_LOCK(ic);
2776 ieee80211_send_setup(bss, m,
2777 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP,
2778 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid);
2779 /* XXX power management? */
2780 m->m_flags |= M_ENCAP; /* mark encapsulated */
2781
2782 M_WME_SETAC(m, WME_AC_BE);
2783
2784 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
2785 "send probe resp on channel %u to %s%s\n",
2786 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da),
2787 legacy ? " <legacy>" : "");
2788 IEEE80211_NODE_STAT(bss, tx_mgmt);
2789
2790 ret = ieee80211_raw_output(vap, bss, m, NULL);
2791 IEEE80211_TX_UNLOCK(ic);
2792 return (ret);
2793 }
2794
2795 /*
2796 * Allocate and build a RTS (Request To Send) control frame.
2797 */
2798 struct mbuf *
2799 ieee80211_alloc_rts(struct ieee80211com *ic,
2800 const uint8_t ra[IEEE80211_ADDR_LEN],
2801 const uint8_t ta[IEEE80211_ADDR_LEN],
2802 uint16_t dur)
2803 {
2804 struct ieee80211_frame_rts *rts;
2805 struct mbuf *m;
2806
2807 /* XXX honor ic_headroom */
2808 m = m_gethdr(M_NOWAIT, MT_DATA);
2809 if (m != NULL) {
2810 rts = mtod(m, struct ieee80211_frame_rts *);
2811 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2812 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS;
2813 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2814 *(u_int16_t *)rts->i_dur = htole16(dur);
2815 IEEE80211_ADDR_COPY(rts->i_ra, ra);
2816 IEEE80211_ADDR_COPY(rts->i_ta, ta);
2817
2818 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts);
2819 }
2820 return m;
2821 }
2822
2823 /*
2824 * Allocate and build a CTS (Clear To Send) control frame.
2825 */
2826 struct mbuf *
2827 ieee80211_alloc_cts(struct ieee80211com *ic,
2828 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur)
2829 {
2830 struct ieee80211_frame_cts *cts;
2831 struct mbuf *m;
2832
2833 /* XXX honor ic_headroom */
2834 m = m_gethdr(M_NOWAIT, MT_DATA);
2835 if (m != NULL) {
2836 cts = mtod(m, struct ieee80211_frame_cts *);
2837 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2838 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS;
2839 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2840 *(u_int16_t *)cts->i_dur = htole16(dur);
2841 IEEE80211_ADDR_COPY(cts->i_ra, ra);
2842
2843 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts);
2844 }
2845 return m;
2846 }
2847
2848 static void
2849 ieee80211_tx_mgt_timeout(void *arg)
2850 {
2851 struct ieee80211vap *vap = arg;
2852
2853 IEEE80211_LOCK(vap->iv_ic);
2854 if (vap->iv_state != IEEE80211_S_INIT &&
2855 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) {
2856 /*
2857 * NB: it's safe to specify a timeout as the reason here;
2858 * it'll only be used in the right state.
2859 */
2860 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN,
2861 IEEE80211_SCAN_FAIL_TIMEOUT);
2862 }
2863 IEEE80211_UNLOCK(vap->iv_ic);
2864 }
2865
2866 /*
2867 * This is the callback set on net80211-sourced transmitted
2868 * authentication request frames.
2869 *
2870 * This does a couple of things:
2871 *
2872 * + If the frame transmitted was a success, it schedules a future
2873 * event which will transition the interface to scan.
2874 * If a state transition _then_ occurs before that event occurs,
2875 * said state transition will cancel this callout.
2876 *
2877 * + If the frame transmit was a failure, it immediately schedules
2878 * the transition back to scan.
2879 */
2880 static void
2881 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status)
2882 {
2883 struct ieee80211vap *vap = ni->ni_vap;
2884 enum ieee80211_state ostate = (enum ieee80211_state) arg;
2885
2886 /*
2887 * Frame transmit completed; arrange timer callback. If
2888 * transmit was successfully we wait for response. Otherwise
2889 * we arrange an immediate callback instead of doing the
2890 * callback directly since we don't know what state the driver
2891 * is in (e.g. what locks it is holding). This work should
2892 * not be too time-critical and not happen too often so the
2893 * added overhead is acceptable.
2894 *
2895 * XXX what happens if !acked but response shows up before callback?
2896 */
2897 if (vap->iv_state == ostate) {
2898 callout_reset(&vap->iv_mgtsend,
2899 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0,
2900 ieee80211_tx_mgt_timeout, vap);
2901 }
2902 }
2903
2904 static void
2905 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm,
2906 struct ieee80211_node *ni)
2907 {
2908 struct ieee80211vap *vap = ni->ni_vap;
2909 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
2910 struct ieee80211com *ic = ni->ni_ic;
2911 struct ieee80211_rateset *rs = &ni->ni_rates;
2912 uint16_t capinfo;
2913
2914 /*
2915 * beacon frame format
2916 * [8] time stamp
2917 * [2] beacon interval
2918 * [2] cabability information
2919 * [tlv] ssid
2920 * [tlv] supported rates
2921 * [3] parameter set (DS)
2922 * [8] CF parameter set (optional)
2923 * [tlv] parameter set (IBSS/TIM)
2924 * [tlv] country (optional)
2925 * [3] power control (optional)
2926 * [5] channel switch announcement (CSA) (optional)
2927 * [tlv] extended rate phy (ERP)
2928 * [tlv] extended supported rates
2929 * [tlv] RSN parameters
2930 * [tlv] HT capabilities
2931 * [tlv] HT information
2932 * XXX Vendor-specific OIDs (e.g. Atheros)
2933 * [tlv] WPA parameters
2934 * [tlv] WME parameters
2935 * [tlv] Vendor OUI HT capabilities (optional)
2936 * [tlv] Vendor OUI HT information (optional)
2937 * [tlv] Atheros capabilities (optional)
2938 * [tlv] TDMA parameters (optional)
2939 * [tlv] Mesh ID (MBSS)
2940 * [tlv] Mesh Conf (MBSS)
2941 * [tlv] application data (optional)
2942 */
2943
2944 memset(bo, 0, sizeof(*bo));
2945
2946 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */
2947 frm += 8;
2948 *(uint16_t *)frm = htole16(ni->ni_intval);
2949 frm += 2;
2950 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
2951 bo->bo_caps = (uint16_t *)frm;
2952 *(uint16_t *)frm = htole16(capinfo);
2953 frm += 2;
2954 *frm++ = IEEE80211_ELEMID_SSID;
2955 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) {
2956 *frm++ = ni->ni_esslen;
2957 memcpy(frm, ni->ni_essid, ni->ni_esslen);
2958 frm += ni->ni_esslen;
2959 } else
2960 *frm++ = 0;
2961 frm = ieee80211_add_rates(frm, rs);
2962 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) {
2963 *frm++ = IEEE80211_ELEMID_DSPARMS;
2964 *frm++ = 1;
2965 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2966 }
2967 if (ic->ic_flags & IEEE80211_F_PCF) {
2968 bo->bo_cfp = frm;
2969 frm = ieee80211_add_cfparms(frm, ic);
2970 }
2971 bo->bo_tim = frm;
2972 if (vap->iv_opmode == IEEE80211_M_IBSS) {
2973 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
2974 *frm++ = 2;
2975 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
2976 bo->bo_tim_len = 0;
2977 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
2978 vap->iv_opmode == IEEE80211_M_MBSS) {
2979 /* TIM IE is the same for Mesh and Hostap */
2980 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
2981
2982 tie->tim_ie = IEEE80211_ELEMID_TIM;
2983 tie->tim_len = 4; /* length */
2984 tie->tim_count = 0; /* DTIM count */
2985 tie->tim_period = vap->iv_dtim_period; /* DTIM period */
2986 tie->tim_bitctl = 0; /* bitmap control */
2987 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
2988 frm += sizeof(struct ieee80211_tim_ie);
2989 bo->bo_tim_len = 1;
2990 }
2991 bo->bo_tim_trailer = frm;
2992 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
2993 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
2994 frm = ieee80211_add_countryie(frm, ic);
2995 if (vap->iv_flags & IEEE80211_F_DOTH) {
2996 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
2997 frm = ieee80211_add_powerconstraint(frm, vap);
2998 bo->bo_csa = frm;
2999 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
3000 frm = ieee80211_add_csa(frm, vap);
3001 } else
3002 bo->bo_csa = frm;
3003
3004 if (vap->iv_flags & IEEE80211_F_DOTH) {
3005 bo->bo_quiet = frm;
3006 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
3007 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
3008 if (vap->iv_quiet)
3009 frm = ieee80211_add_quiet(frm,vap);
3010 }
3011 } else
3012 bo->bo_quiet = frm;
3013
3014 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) {
3015 bo->bo_erp = frm;
3016 frm = ieee80211_add_erp(frm, ic);
3017 }
3018 frm = ieee80211_add_xrates(frm, rs);
3019 frm = ieee80211_add_rsn(frm, vap);
3020 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) {
3021 frm = ieee80211_add_htcap(frm, ni);
3022 bo->bo_htinfo = frm;
3023 frm = ieee80211_add_htinfo(frm, ni);
3024 }
3025 frm = ieee80211_add_wpa(frm, vap);
3026 if (vap->iv_flags & IEEE80211_F_WME) {
3027 bo->bo_wme = frm;
3028 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
3029 }
3030 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
3031 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) {
3032 frm = ieee80211_add_htcap_vendor(frm, ni);
3033 frm = ieee80211_add_htinfo_vendor(frm, ni);
3034 }
3035 #ifdef IEEE80211_SUPPORT_SUPERG
3036 if (vap->iv_flags & IEEE80211_F_ATHEROS) {
3037 bo->bo_ath = frm;
3038 frm = ieee80211_add_athcaps(frm, ni);
3039 }
3040 #endif
3041 #ifdef IEEE80211_SUPPORT_TDMA
3042 if (vap->iv_caps & IEEE80211_C_TDMA) {
3043 bo->bo_tdma = frm;
3044 frm = ieee80211_add_tdma(frm, vap);
3045 }
3046 #endif
3047 if (vap->iv_appie_beacon != NULL) {
3048 bo->bo_appie = frm;
3049 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
3050 frm = add_appie(frm, vap->iv_appie_beacon);
3051 }
3052 #ifdef IEEE80211_SUPPORT_MESH
3053 if (vap->iv_opmode == IEEE80211_M_MBSS) {
3054 frm = ieee80211_add_meshid(frm, vap);
3055 bo->bo_meshconf = frm;
3056 frm = ieee80211_add_meshconf(frm, vap);
3057 }
3058 #endif
3059 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
3060 bo->bo_csa_trailer_len = frm - bo->bo_csa;
3061 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3062 }
3063
3064 /*
3065 * Allocate a beacon frame and fillin the appropriate bits.
3066 */
3067 struct mbuf *
3068 ieee80211_beacon_alloc(struct ieee80211_node *ni)
3069 {
3070 struct ieee80211vap *vap = ni->ni_vap;
3071 struct ieee80211com *ic = ni->ni_ic;
3072 struct ifnet *ifp = vap->iv_ifp;
3073 struct ieee80211_frame *wh;
3074 struct mbuf *m;
3075 int pktlen;
3076 uint8_t *frm;
3077
3078 /*
3079 * beacon frame format
3080 * [8] time stamp
3081 * [2] beacon interval
3082 * [2] cabability information
3083 * [tlv] ssid
3084 * [tlv] supported rates
3085 * [3] parameter set (DS)
3086 * [8] CF parameter set (optional)
3087 * [tlv] parameter set (IBSS/TIM)
3088 * [tlv] country (optional)
3089 * [3] power control (optional)
3090 * [5] channel switch announcement (CSA) (optional)
3091 * [tlv] extended rate phy (ERP)
3092 * [tlv] extended supported rates
3093 * [tlv] RSN parameters
3094 * [tlv] HT capabilities
3095 * [tlv] HT information
3096 * [tlv] Vendor OUI HT capabilities (optional)
3097 * [tlv] Vendor OUI HT information (optional)
3098 * XXX Vendor-specific OIDs (e.g. Atheros)
3099 * [tlv] WPA parameters
3100 * [tlv] WME parameters
3101 * [tlv] TDMA parameters (optional)
3102 * [tlv] Mesh ID (MBSS)
3103 * [tlv] Mesh Conf (MBSS)
3104 * [tlv] application data (optional)
3105 * NB: we allocate the max space required for the TIM bitmap.
3106 * XXX how big is this?
3107 */
3108 pktlen = 8 /* time stamp */
3109 + sizeof(uint16_t) /* beacon interval */
3110 + sizeof(uint16_t) /* capabilities */
3111 + 2 + ni->ni_esslen /* ssid */
3112 + 2 + IEEE80211_RATE_SIZE /* supported rates */
3113 + 2 + 1 /* DS parameters */
3114 + 2 + 6 /* CF parameters */
3115 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */
3116 + IEEE80211_COUNTRY_MAX_SIZE /* country */
3117 + 2 + 1 /* power control */
3118 + sizeof(struct ieee80211_csa_ie) /* CSA */
3119 + sizeof(struct ieee80211_quiet_ie) /* Quiet */
3120 + 2 + 1 /* ERP */
3121 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
3122 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
3123 2*sizeof(struct ieee80211_ie_wpa) : 0)
3124 /* XXX conditional? */
3125 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
3126 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
3127 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */
3128 sizeof(struct ieee80211_wme_param) : 0)
3129 #ifdef IEEE80211_SUPPORT_SUPERG
3130 + sizeof(struct ieee80211_ath_ie) /* ATH */
3131 #endif
3132 #ifdef IEEE80211_SUPPORT_TDMA
3133 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */
3134 sizeof(struct ieee80211_tdma_param) : 0)
3135 #endif
3136 #ifdef IEEE80211_SUPPORT_MESH
3137 + 2 + ni->ni_meshidlen
3138 + sizeof(struct ieee80211_meshconf_ie)
3139 #endif
3140 + IEEE80211_MAX_APPIE
3141 ;
3142 m = ieee80211_getmgtframe(&frm,
3143 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
3144 if (m == NULL) {
3145 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
3146 "%s: cannot get buf; size %u\n", __func__, pktlen);
3147 vap->iv_stats.is_tx_nobuf++;
3148 return NULL;
3149 }
3150 ieee80211_beacon_construct(m, frm, ni);
3151
3152 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
3153 KASSERT(m != NULL, ("no space for 802.11 header?"));
3154 wh = mtod(m, struct ieee80211_frame *);
3155 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
3156 IEEE80211_FC0_SUBTYPE_BEACON;
3157 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
3158 *(uint16_t *)wh->i_dur = 0;
3159 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
3160 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
3161 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
3162 *(uint16_t *)wh->i_seq = 0;
3163
3164 return m;
3165 }
3166
3167 /*
3168 * Update the dynamic parts of a beacon frame based on the current state.
3169 */
3170 int
3171 ieee80211_beacon_update(struct ieee80211_node *ni, struct mbuf *m, int mcast)
3172 {
3173 struct ieee80211vap *vap = ni->ni_vap;
3174 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
3175 struct ieee80211com *ic = ni->ni_ic;
3176 int len_changed = 0;
3177 uint16_t capinfo;
3178 struct ieee80211_frame *wh;
3179 ieee80211_seq seqno;
3180
3181 IEEE80211_LOCK(ic);
3182 /*
3183 * Handle 11h channel change when we've reached the count.
3184 * We must recalculate the beacon frame contents to account
3185 * for the new channel. Note we do this only for the first
3186 * vap that reaches this point; subsequent vaps just update
3187 * their beacon state to reflect the recalculated channel.
3188 */
3189 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
3190 vap->iv_csa_count == ic->ic_csa_count) {
3191 vap->iv_csa_count = 0;
3192 /*
3193 * Effect channel change before reconstructing the beacon
3194 * frame contents as many places reference ni_chan.
3195 */
3196 if (ic->ic_csa_newchan != NULL)
3197 ieee80211_csa_completeswitch(ic);
3198 /*
3199 * NB: ieee80211_beacon_construct clears all pending
3200 * updates in bo_flags so we don't need to explicitly
3201 * clear IEEE80211_BEACON_CSA.
3202 */
3203 ieee80211_beacon_construct(m,
3204 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni);
3205
3206 /* XXX do WME aggressive mode processing? */
3207 IEEE80211_UNLOCK(ic);
3208 return 1; /* just assume length changed */
3209 }
3210
3211 wh = mtod(m, struct ieee80211_frame *);
3212 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
3213 *(uint16_t *)&wh->i_seq[0] =
3214 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
3215 M_SEQNO_SET(m, seqno);
3216
3217 /* XXX faster to recalculate entirely or just changes? */
3218 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
3219 *bo->bo_caps = htole16(capinfo);
3220
3221 if (vap->iv_flags & IEEE80211_F_WME) {
3222 struct ieee80211_wme_state *wme = &ic->ic_wme;
3223
3224 /*
3225 * Check for aggressive mode change. When there is
3226 * significant high priority traffic in the BSS
3227 * throttle back BE traffic by using conservative
3228 * parameters. Otherwise BE uses aggressive params
3229 * to optimize performance of legacy/non-QoS traffic.
3230 */
3231 if (wme->wme_flags & WME_F_AGGRMODE) {
3232 if (wme->wme_hipri_traffic >
3233 wme->wme_hipri_switch_thresh) {
3234 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
3235 "%s: traffic %u, disable aggressive mode\n",
3236 __func__, wme->wme_hipri_traffic);
3237 wme->wme_flags &= ~WME_F_AGGRMODE;
3238 ieee80211_wme_updateparams_locked(vap);
3239 wme->wme_hipri_traffic =
3240 wme->wme_hipri_switch_hysteresis;
3241 } else
3242 wme->wme_hipri_traffic = 0;
3243 } else {
3244 if (wme->wme_hipri_traffic <=
3245 wme->wme_hipri_switch_thresh) {
3246 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
3247 "%s: traffic %u, enable aggressive mode\n",
3248 __func__, wme->wme_hipri_traffic);
3249 wme->wme_flags |= WME_F_AGGRMODE;
3250 ieee80211_wme_updateparams_locked(vap);
3251 wme->wme_hipri_traffic = 0;
3252 } else
3253 wme->wme_hipri_traffic =
3254 wme->wme_hipri_switch_hysteresis;
3255 }
3256 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
3257 (void) ieee80211_add_wme_param(bo->bo_wme, wme);
3258 clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
3259 }
3260 }
3261
3262 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) {
3263 ieee80211_ht_update_beacon(vap, bo);
3264 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
3265 }
3266 #ifdef IEEE80211_SUPPORT_TDMA
3267 if (vap->iv_caps & IEEE80211_C_TDMA) {
3268 /*
3269 * NB: the beacon is potentially updated every TBTT.
3270 */
3271 ieee80211_tdma_update_beacon(vap, bo);
3272 }
3273 #endif
3274 #ifdef IEEE80211_SUPPORT_MESH
3275 if (vap->iv_opmode == IEEE80211_M_MBSS)
3276 ieee80211_mesh_update_beacon(vap, bo);
3277 #endif
3278
3279 if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
3280 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/
3281 struct ieee80211_tim_ie *tie =
3282 (struct ieee80211_tim_ie *) bo->bo_tim;
3283 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
3284 u_int timlen, timoff, i;
3285 /*
3286 * ATIM/DTIM needs updating. If it fits in the
3287 * current space allocated then just copy in the
3288 * new bits. Otherwise we need to move any trailing
3289 * data to make room. Note that we know there is
3290 * contiguous space because ieee80211_beacon_allocate
3291 * insures there is space in the mbuf to write a
3292 * maximal-size virtual bitmap (based on iv_max_aid).
3293 */
3294 /*
3295 * Calculate the bitmap size and offset, copy any
3296 * trailer out of the way, and then copy in the
3297 * new bitmap and update the information element.
3298 * Note that the tim bitmap must contain at least
3299 * one byte and any offset must be even.
3300 */
3301 if (vap->iv_ps_pending != 0) {
3302 timoff = 128; /* impossibly large */
3303 for (i = 0; i < vap->iv_tim_len; i++)
3304 if (vap->iv_tim_bitmap[i]) {
3305 timoff = i &~ 1;
3306 break;
3307 }
3308 KASSERT(timoff != 128, ("tim bitmap empty!"));
3309 for (i = vap->iv_tim_len-1; i >= timoff; i--)
3310 if (vap->iv_tim_bitmap[i])
3311 break;
3312 timlen = 1 + (i - timoff);
3313 } else {
3314 timoff = 0;
3315 timlen = 1;
3316 }
3317 if (timlen != bo->bo_tim_len) {
3318 /* copy up/down trailer */
3319 int adjust = tie->tim_bitmap+timlen
3320 - bo->bo_tim_trailer;
3321 ovbcopy(bo->bo_tim_trailer,
3322 bo->bo_tim_trailer+adjust,
3323 bo->bo_tim_trailer_len);
3324 bo->bo_tim_trailer += adjust;
3325 bo->bo_erp += adjust;
3326 bo->bo_htinfo += adjust;
3327 #ifdef IEEE80211_SUPPORT_SUPERG
3328 bo->bo_ath += adjust;
3329 #endif
3330 #ifdef IEEE80211_SUPPORT_TDMA
3331 bo->bo_tdma += adjust;
3332 #endif
3333 #ifdef IEEE80211_SUPPORT_MESH
3334 bo->bo_meshconf += adjust;
3335 #endif
3336 bo->bo_appie += adjust;
3337 bo->bo_wme += adjust;
3338 bo->bo_csa += adjust;
3339 bo->bo_quiet += adjust;
3340 bo->bo_tim_len = timlen;
3341
3342 /* update information element */
3343 tie->tim_len = 3 + timlen;
3344 tie->tim_bitctl = timoff;
3345 len_changed = 1;
3346 }
3347 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
3348 bo->bo_tim_len);
3349
3350 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
3351
3352 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
3353 "%s: TIM updated, pending %u, off %u, len %u\n",
3354 __func__, vap->iv_ps_pending, timoff, timlen);
3355 }
3356 /* count down DTIM period */
3357 if (tie->tim_count == 0)
3358 tie->tim_count = tie->tim_period - 1;
3359 else
3360 tie->tim_count--;
3361 /* update state for buffered multicast frames on DTIM */
3362 if (mcast && tie->tim_count == 0)
3363 tie->tim_bitctl |= 1;
3364 else
3365 tie->tim_bitctl &= ~1;
3366 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
3367 struct ieee80211_csa_ie *csa =
3368 (struct ieee80211_csa_ie *) bo->bo_csa;
3369
3370 /*
3371 * Insert or update CSA ie. If we're just starting
3372 * to count down to the channel switch then we need
3373 * to insert the CSA ie. Otherwise we just need to
3374 * drop the count. The actual change happens above
3375 * when the vap's count reaches the target count.
3376 */
3377 if (vap->iv_csa_count == 0) {
3378 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
3379 bo->bo_erp += sizeof(*csa);
3380 bo->bo_htinfo += sizeof(*csa);
3381 bo->bo_wme += sizeof(*csa);
3382 #ifdef IEEE80211_SUPPORT_SUPERG
3383 bo->bo_ath += sizeof(*csa);
3384 #endif
3385 #ifdef IEEE80211_SUPPORT_TDMA
3386 bo->bo_tdma += sizeof(*csa);
3387 #endif
3388 #ifdef IEEE80211_SUPPORT_MESH
3389 bo->bo_meshconf += sizeof(*csa);
3390 #endif
3391 bo->bo_appie += sizeof(*csa);
3392 bo->bo_csa_trailer_len += sizeof(*csa);
3393 bo->bo_quiet += sizeof(*csa);
3394 bo->bo_tim_trailer_len += sizeof(*csa);
3395 m->m_len += sizeof(*csa);
3396 m->m_pkthdr.len += sizeof(*csa);
3397
3398 ieee80211_add_csa(bo->bo_csa, vap);
3399 } else
3400 csa->csa_count--;
3401 vap->iv_csa_count++;
3402 /* NB: don't clear IEEE80211_BEACON_CSA */
3403 }
3404 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
3405 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){
3406 if (vap->iv_quiet)
3407 ieee80211_add_quiet(bo->bo_quiet, vap);
3408 }
3409 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
3410 /*
3411 * ERP element needs updating.
3412 */
3413 (void) ieee80211_add_erp(bo->bo_erp, ic);
3414 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
3415 }
3416 #ifdef IEEE80211_SUPPORT_SUPERG
3417 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) {
3418 ieee80211_add_athcaps(bo->bo_ath, ni);
3419 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
3420 }
3421 #endif
3422 }
3423 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
3424 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
3425 int aielen;
3426 uint8_t *frm;
3427
3428 aielen = 0;
3429 if (aie != NULL)
3430 aielen += aie->ie_len;
3431 if (aielen != bo->bo_appie_len) {
3432 /* copy up/down trailer */
3433 int adjust = aielen - bo->bo_appie_len;
3434 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
3435 bo->bo_tim_trailer_len);
3436 bo->bo_tim_trailer += adjust;
3437 bo->bo_appie += adjust;
3438 bo->bo_appie_len = aielen;
3439
3440 len_changed = 1;
3441 }
3442 frm = bo->bo_appie;
3443 if (aie != NULL)
3444 frm = add_appie(frm, aie);
3445 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
3446 }
3447 IEEE80211_UNLOCK(ic);
3448
3449 return len_changed;
3450 }
3451
3452 /*
3453 * Do Ethernet-LLC encapsulation for each payload in a fast frame
3454 * tunnel encapsulation. The frame is assumed to have an Ethernet
3455 * header at the front that must be stripped before prepending the
3456 * LLC followed by the Ethernet header passed in (with an Ethernet
3457 * type that specifies the payload size).
3458 */
3459 struct mbuf *
3460 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m,
3461 const struct ether_header *eh)
3462 {
3463 struct llc *llc;
3464 uint16_t payload;
3465
3466 /* XXX optimize by combining m_adj+M_PREPEND */
3467 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
3468 llc = mtod(m, struct llc *);
3469 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
3470 llc->llc_control = LLC_UI;
3471 llc->llc_snap.org_code[0] = 0;
3472 llc->llc_snap.org_code[1] = 0;
3473 llc->llc_snap.org_code[2] = 0;
3474 llc->llc_snap.ether_type = eh->ether_type;
3475 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */
3476
3477 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT);
3478 if (m == NULL) { /* XXX cannot happen */
3479 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
3480 "%s: no space for ether_header\n", __func__);
3481 vap->iv_stats.is_tx_nobuf++;
3482 return NULL;
3483 }
3484 ETHER_HEADER_COPY(mtod(m, void *), eh);
3485 mtod(m, struct ether_header *)->ether_type = htons(payload);
3486 return m;
3487 }
3488
3489 /*
3490 * Complete an mbuf transmission.
3491 *
3492 * For now, this simply processes a completed frame after the
3493 * driver has completed it's transmission and/or retransmission.
3494 * It assumes the frame is an 802.11 encapsulated frame.
3495 *
3496 * Later on it will grow to become the exit path for a given frame
3497 * from the driver and, depending upon how it's been encapsulated
3498 * and already transmitted, it may end up doing A-MPDU retransmission,
3499 * power save requeuing, etc.
3500 *
3501 * In order for the above to work, the driver entry point to this
3502 * must not hold any driver locks. Thus, the driver needs to delay
3503 * any actual mbuf completion until it can release said locks.
3504 *
3505 * This frees the mbuf and if the mbuf has a node reference,
3506 * the node reference will be freed.
3507 */
3508 void
3509 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status)
3510 {
3511
3512 if (ni != NULL) {
3513 struct ifnet *ifp = ni->ni_vap->iv_ifp;
3514
3515 if (status == 0) {
3516 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
3517 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
3518 if (m->m_flags & M_MCAST)
3519 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
3520 } else
3521 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
3522 if (m->m_flags & M_TXCB)
3523 ieee80211_process_callback(ni, m, status);
3524 ieee80211_free_node(ni);
3525 }
3526 m_freem(m);
3527 }
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