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
doprint(struct ieee80211vap * vap,int subtype)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
ieee80211_vap_pkt_send_dest(struct ieee80211vap * vap,struct mbuf * m,struct ieee80211_node * ni)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
ieee80211_start_pkt(struct ieee80211vap * vap,struct mbuf * m)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
ieee80211_vap_transmit(struct ifnet * ifp,struct mbuf * m)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
ieee80211_vap_qflush(struct ifnet * ifp)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
ieee80211_raw_output(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_bpf_params * params)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
ieee80211_output(struct ifnet * ifp,struct mbuf * m,const struct sockaddr * dst,struct route * ro)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 if (m->m_pkthdr.len < ieee80211_anyhdrsize(wh))
612 senderr(EIO); /* XXX */
613
614 /* locate destination node */
615 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
616 case IEEE80211_FC1_DIR_NODS:
617 case IEEE80211_FC1_DIR_FROMDS:
618 ni = ieee80211_find_txnode(vap, wh->i_addr1);
619 break;
620 case IEEE80211_FC1_DIR_TODS:
621 case IEEE80211_FC1_DIR_DSTODS:
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 IEEE80211_NODE_STAT(ni, tx_data);
651 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
652 IEEE80211_NODE_STAT(ni, tx_mcast);
653 m->m_flags |= M_MCAST;
654 } else
655 IEEE80211_NODE_STAT(ni, tx_ucast);
656 /* NB: ieee80211_encap does not include 802.11 header */
657 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len);
658
659 IEEE80211_TX_LOCK(ic);
660
661 /*
662 * NB: DLT_IEEE802_11_RADIO identifies the parameters are
663 * present by setting the sa_len field of the sockaddr (yes,
664 * this is a hack).
665 * NB: we assume sa_data is suitably aligned to cast.
666 */
667 ret = ieee80211_raw_output(vap, ni, m,
668 (const struct ieee80211_bpf_params *)(dst->sa_len ?
669 dst->sa_data : NULL));
670 IEEE80211_TX_UNLOCK(ic);
671 return (ret);
672 bad:
673 if (m != NULL)
674 m_freem(m);
675 if (ni != NULL)
676 ieee80211_free_node(ni);
677 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
678 return error;
679 #undef senderr
680 }
681
682 /*
683 * Set the direction field and address fields of an outgoing
684 * frame. Note this should be called early on in constructing
685 * a frame as it sets i_fc[1]; other bits can then be or'd in.
686 */
687 void
ieee80211_send_setup(struct ieee80211_node * ni,struct mbuf * m,int type,int tid,const uint8_t sa[IEEE80211_ADDR_LEN],const uint8_t da[IEEE80211_ADDR_LEN],const uint8_t bssid[IEEE80211_ADDR_LEN])688 ieee80211_send_setup(
689 struct ieee80211_node *ni,
690 struct mbuf *m,
691 int type, int tid,
692 const uint8_t sa[IEEE80211_ADDR_LEN],
693 const uint8_t da[IEEE80211_ADDR_LEN],
694 const uint8_t bssid[IEEE80211_ADDR_LEN])
695 {
696 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
697 struct ieee80211vap *vap = ni->ni_vap;
698 struct ieee80211_tx_ampdu *tap;
699 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
700 ieee80211_seq seqno;
701
702 IEEE80211_TX_LOCK_ASSERT(ni->ni_ic);
703
704 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
705 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
706 switch (vap->iv_opmode) {
707 case IEEE80211_M_STA:
708 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
709 IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
710 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
711 IEEE80211_ADDR_COPY(wh->i_addr3, da);
712 break;
713 case IEEE80211_M_IBSS:
714 case IEEE80211_M_AHDEMO:
715 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
716 IEEE80211_ADDR_COPY(wh->i_addr1, da);
717 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
718 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
719 break;
720 case IEEE80211_M_HOSTAP:
721 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
722 IEEE80211_ADDR_COPY(wh->i_addr1, da);
723 IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
724 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
725 break;
726 case IEEE80211_M_WDS:
727 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
728 IEEE80211_ADDR_COPY(wh->i_addr1, da);
729 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
730 IEEE80211_ADDR_COPY(wh->i_addr3, da);
731 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
732 break;
733 case IEEE80211_M_MBSS:
734 #ifdef IEEE80211_SUPPORT_MESH
735 if (IEEE80211_IS_MULTICAST(da)) {
736 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
737 /* XXX next hop */
738 IEEE80211_ADDR_COPY(wh->i_addr1, da);
739 IEEE80211_ADDR_COPY(wh->i_addr2,
740 vap->iv_myaddr);
741 } else {
742 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
743 IEEE80211_ADDR_COPY(wh->i_addr1, da);
744 IEEE80211_ADDR_COPY(wh->i_addr2,
745 vap->iv_myaddr);
746 IEEE80211_ADDR_COPY(wh->i_addr3, da);
747 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
748 }
749 #endif
750 break;
751 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */
752 break;
753 }
754 } else {
755 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
756 IEEE80211_ADDR_COPY(wh->i_addr1, da);
757 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
758 #ifdef IEEE80211_SUPPORT_MESH
759 if (vap->iv_opmode == IEEE80211_M_MBSS)
760 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
761 else
762 #endif
763 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
764 }
765 *(uint16_t *)&wh->i_dur[0] = 0;
766
767 tap = &ni->ni_tx_ampdu[tid];
768 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap))
769 m->m_flags |= M_AMPDU_MPDU;
770 else {
771 if (IEEE80211_HAS_SEQ(type & IEEE80211_FC0_TYPE_MASK,
772 type & IEEE80211_FC0_SUBTYPE_MASK))
773 seqno = ni->ni_txseqs[tid]++;
774 else
775 seqno = 0;
776
777 *(uint16_t *)&wh->i_seq[0] =
778 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
779 M_SEQNO_SET(m, seqno);
780 }
781
782 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
783 m->m_flags |= M_MCAST;
784 #undef WH4
785 }
786
787 /*
788 * Send a management frame to the specified node. The node pointer
789 * must have a reference as the pointer will be passed to the driver
790 * and potentially held for a long time. If the frame is successfully
791 * dispatched to the driver, then it is responsible for freeing the
792 * reference (and potentially free'ing up any associated storage);
793 * otherwise deal with reclaiming any reference (on error).
794 */
795 int
ieee80211_mgmt_output(struct ieee80211_node * ni,struct mbuf * m,int type,struct ieee80211_bpf_params * params)796 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
797 struct ieee80211_bpf_params *params)
798 {
799 struct ieee80211vap *vap = ni->ni_vap;
800 struct ieee80211com *ic = ni->ni_ic;
801 struct ieee80211_frame *wh;
802 int ret;
803
804 KASSERT(ni != NULL, ("null node"));
805
806 if (vap->iv_state == IEEE80211_S_CAC) {
807 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
808 ni, "block %s frame in CAC state",
809 ieee80211_mgt_subtype_name(type));
810 vap->iv_stats.is_tx_badstate++;
811 ieee80211_free_node(ni);
812 m_freem(m);
813 return EIO; /* XXX */
814 }
815
816 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
817 if (m == NULL) {
818 ieee80211_free_node(ni);
819 return ENOMEM;
820 }
821
822 IEEE80211_TX_LOCK(ic);
823
824 wh = mtod(m, struct ieee80211_frame *);
825 ieee80211_send_setup(ni, m,
826 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
827 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
828 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
829 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
830 "encrypting frame (%s)", __func__);
831 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
832 }
833 m->m_flags |= M_ENCAP; /* mark encapsulated */
834
835 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
836 M_WME_SETAC(m, params->ibp_pri);
837
838 #ifdef IEEE80211_DEBUG
839 /* avoid printing too many frames */
840 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
841 ieee80211_msg_dumppkts(vap)) {
842 printf("[%s] send %s on channel %u\n",
843 ether_sprintf(wh->i_addr1),
844 ieee80211_mgt_subtype_name(type),
845 ieee80211_chan2ieee(ic, ic->ic_curchan));
846 }
847 #endif
848 IEEE80211_NODE_STAT(ni, tx_mgmt);
849
850 ret = ieee80211_raw_output(vap, ni, m, params);
851 IEEE80211_TX_UNLOCK(ic);
852 return (ret);
853 }
854
855 static void
ieee80211_nulldata_transmitted(struct ieee80211_node * ni,void * arg,int status)856 ieee80211_nulldata_transmitted(struct ieee80211_node *ni, void *arg,
857 int status)
858 {
859 struct ieee80211vap *vap = ni->ni_vap;
860
861 wakeup(vap);
862 }
863
864 /*
865 * Send a null data frame to the specified node. If the station
866 * is setup for QoS then a QoS Null Data frame is constructed.
867 * If this is a WDS station then a 4-address frame is constructed.
868 *
869 * NB: the caller is assumed to have setup a node reference
870 * for use; this is necessary to deal with a race condition
871 * when probing for inactive stations. Like ieee80211_mgmt_output
872 * we must cleanup any node reference on error; however we
873 * can safely just unref it as we know it will never be the
874 * last reference to the node.
875 */
876 int
ieee80211_send_nulldata(struct ieee80211_node * ni)877 ieee80211_send_nulldata(struct ieee80211_node *ni)
878 {
879 struct ieee80211vap *vap = ni->ni_vap;
880 struct ieee80211com *ic = ni->ni_ic;
881 struct mbuf *m;
882 struct ieee80211_frame *wh;
883 int hdrlen;
884 uint8_t *frm;
885 int ret;
886
887 if (vap->iv_state == IEEE80211_S_CAC) {
888 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
889 ni, "block %s frame in CAC state", "null data");
890 ieee80211_unref_node(&ni);
891 vap->iv_stats.is_tx_badstate++;
892 return EIO; /* XXX */
893 }
894
895 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
896 hdrlen = sizeof(struct ieee80211_qosframe);
897 else
898 hdrlen = sizeof(struct ieee80211_frame);
899 /* NB: only WDS vap's get 4-address frames */
900 if (vap->iv_opmode == IEEE80211_M_WDS)
901 hdrlen += IEEE80211_ADDR_LEN;
902 if (ic->ic_flags & IEEE80211_F_DATAPAD)
903 hdrlen = roundup(hdrlen, sizeof(uint32_t));
904
905 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
906 if (m == NULL) {
907 /* XXX debug msg */
908 ieee80211_unref_node(&ni);
909 vap->iv_stats.is_tx_nobuf++;
910 return ENOMEM;
911 }
912 KASSERT(M_LEADINGSPACE(m) >= hdrlen,
913 ("leading space %zd", M_LEADINGSPACE(m)));
914 M_PREPEND(m, hdrlen, M_NOWAIT);
915 if (m == NULL) {
916 /* NB: cannot happen */
917 ieee80211_free_node(ni);
918 return ENOMEM;
919 }
920
921 IEEE80211_TX_LOCK(ic);
922
923 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */
924 if (ni->ni_flags & IEEE80211_NODE_QOS) {
925 const int tid = WME_AC_TO_TID(WME_AC_BE);
926 uint8_t *qos;
927
928 ieee80211_send_setup(ni, m,
929 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
930 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
931
932 if (vap->iv_opmode == IEEE80211_M_WDS)
933 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
934 else
935 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
936 qos[0] = tid & IEEE80211_QOS_TID;
937 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
938 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
939 qos[1] = 0;
940 } else {
941 ieee80211_send_setup(ni, m,
942 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
943 IEEE80211_NONQOS_TID,
944 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
945 }
946 if (vap->iv_opmode != IEEE80211_M_WDS) {
947 /* NB: power management bit is never sent by an AP */
948 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
949 vap->iv_opmode != IEEE80211_M_HOSTAP)
950 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
951 }
952 if ((ic->ic_flags & IEEE80211_F_SCAN) &&
953 (ni->ni_flags & IEEE80211_NODE_PWR_MGT)) {
954 ieee80211_add_callback(m, ieee80211_nulldata_transmitted,
955 NULL);
956 }
957 m->m_len = m->m_pkthdr.len = hdrlen;
958 m->m_flags |= M_ENCAP; /* mark encapsulated */
959
960 M_WME_SETAC(m, WME_AC_BE);
961
962 IEEE80211_NODE_STAT(ni, tx_data);
963
964 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
965 "send %snull data frame on channel %u, pwr mgt %s",
966 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
967 ieee80211_chan2ieee(ic, ic->ic_curchan),
968 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
969
970 ret = ieee80211_raw_output(vap, ni, m, NULL);
971 IEEE80211_TX_UNLOCK(ic);
972 return (ret);
973 }
974
975 /*
976 * Assign priority to a frame based on any vlan tag assigned
977 * to the station and/or any Diffserv setting in an IP header.
978 * Finally, if an ACM policy is setup (in station mode) it's
979 * applied.
980 */
981 int
ieee80211_classify(struct ieee80211_node * ni,struct mbuf * m)982 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
983 {
984 const struct ether_header *eh = mtod(m, struct ether_header *);
985 int v_wme_ac, d_wme_ac, ac;
986
987 /*
988 * Always promote PAE/EAPOL frames to high priority.
989 */
990 if (eh->ether_type == htons(ETHERTYPE_PAE)) {
991 /* NB: mark so others don't need to check header */
992 m->m_flags |= M_EAPOL;
993 ac = WME_AC_VO;
994 goto done;
995 }
996 /*
997 * Non-qos traffic goes to BE.
998 */
999 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
1000 ac = WME_AC_BE;
1001 goto done;
1002 }
1003
1004 /*
1005 * If node has a vlan tag then all traffic
1006 * to it must have a matching tag.
1007 */
1008 v_wme_ac = 0;
1009 if (ni->ni_vlan != 0) {
1010 if ((m->m_flags & M_VLANTAG) == 0) {
1011 IEEE80211_NODE_STAT(ni, tx_novlantag);
1012 return 1;
1013 }
1014 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
1015 EVL_VLANOFTAG(ni->ni_vlan)) {
1016 IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
1017 return 1;
1018 }
1019 /* map vlan priority to AC */
1020 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
1021 }
1022
1023 /* XXX m_copydata may be too slow for fast path */
1024 #ifdef INET
1025 if (eh->ether_type == htons(ETHERTYPE_IP)) {
1026 uint8_t tos;
1027 /*
1028 * IP frame, map the DSCP bits from the TOS field.
1029 */
1030 /* NB: ip header may not be in first mbuf */
1031 m_copydata(m, sizeof(struct ether_header) +
1032 offsetof(struct ip, ip_tos), sizeof(tos), &tos);
1033 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
1034 d_wme_ac = TID_TO_WME_AC(tos);
1035 } else {
1036 #endif /* INET */
1037 #ifdef INET6
1038 if (eh->ether_type == htons(ETHERTYPE_IPV6)) {
1039 uint32_t flow;
1040 uint8_t tos;
1041 /*
1042 * IPv6 frame, map the DSCP bits from the traffic class field.
1043 */
1044 m_copydata(m, sizeof(struct ether_header) +
1045 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow),
1046 (caddr_t) &flow);
1047 tos = (uint8_t)(ntohl(flow) >> 20);
1048 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
1049 d_wme_ac = TID_TO_WME_AC(tos);
1050 } else {
1051 #endif /* INET6 */
1052 d_wme_ac = WME_AC_BE;
1053 #ifdef INET6
1054 }
1055 #endif
1056 #ifdef INET
1057 }
1058 #endif
1059 /*
1060 * Use highest priority AC.
1061 */
1062 if (v_wme_ac > d_wme_ac)
1063 ac = v_wme_ac;
1064 else
1065 ac = d_wme_ac;
1066
1067 /*
1068 * Apply ACM policy.
1069 */
1070 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
1071 static const int acmap[4] = {
1072 WME_AC_BK, /* WME_AC_BE */
1073 WME_AC_BK, /* WME_AC_BK */
1074 WME_AC_BE, /* WME_AC_VI */
1075 WME_AC_VI, /* WME_AC_VO */
1076 };
1077 struct ieee80211com *ic = ni->ni_ic;
1078
1079 while (ac != WME_AC_BK &&
1080 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
1081 ac = acmap[ac];
1082 }
1083 done:
1084 M_WME_SETAC(m, ac);
1085 return 0;
1086 }
1087
1088 /*
1089 * Insure there is sufficient contiguous space to encapsulate the
1090 * 802.11 data frame. If room isn't already there, arrange for it.
1091 * Drivers and cipher modules assume we have done the necessary work
1092 * and fail rudely if they don't find the space they need.
1093 */
1094 struct mbuf *
ieee80211_mbuf_adjust(struct ieee80211vap * vap,int hdrsize,struct ieee80211_key * key,struct mbuf * m)1095 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
1096 struct ieee80211_key *key, struct mbuf *m)
1097 {
1098 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
1099 int needed_space = vap->iv_ic->ic_headroom + hdrsize;
1100
1101 if (key != NULL) {
1102 /* XXX belongs in crypto code? */
1103 needed_space += key->wk_cipher->ic_header;
1104 /* XXX frags */
1105 /*
1106 * When crypto is being done in the host we must insure
1107 * the data are writable for the cipher routines; clone
1108 * a writable mbuf chain.
1109 * XXX handle SWMIC specially
1110 */
1111 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
1112 m = m_unshare(m, M_NOWAIT);
1113 if (m == NULL) {
1114 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
1115 "%s: cannot get writable mbuf\n", __func__);
1116 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
1117 return NULL;
1118 }
1119 }
1120 }
1121 /*
1122 * We know we are called just before stripping an Ethernet
1123 * header and prepending an LLC header. This means we know
1124 * there will be
1125 * sizeof(struct ether_header) - sizeof(struct llc)
1126 * bytes recovered to which we need additional space for the
1127 * 802.11 header and any crypto header.
1128 */
1129 /* XXX check trailing space and copy instead? */
1130 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
1131 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
1132 if (n == NULL) {
1133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
1134 "%s: cannot expand storage\n", __func__);
1135 vap->iv_stats.is_tx_nobuf++;
1136 m_freem(m);
1137 return NULL;
1138 }
1139 KASSERT(needed_space <= MHLEN,
1140 ("not enough room, need %u got %d\n", needed_space, MHLEN));
1141 /*
1142 * Setup new mbuf to have leading space to prepend the
1143 * 802.11 header and any crypto header bits that are
1144 * required (the latter are added when the driver calls
1145 * back to ieee80211_crypto_encap to do crypto encapsulation).
1146 */
1147 /* NB: must be first 'cuz it clobbers m_data */
1148 m_move_pkthdr(n, m);
1149 n->m_len = 0; /* NB: m_gethdr does not set */
1150 n->m_data += needed_space;
1151 /*
1152 * Pull up Ethernet header to create the expected layout.
1153 * We could use m_pullup but that's overkill (i.e. we don't
1154 * need the actual data) and it cannot fail so do it inline
1155 * for speed.
1156 */
1157 /* NB: struct ether_header is known to be contiguous */
1158 n->m_len += sizeof(struct ether_header);
1159 m->m_len -= sizeof(struct ether_header);
1160 m->m_data += sizeof(struct ether_header);
1161 /*
1162 * Replace the head of the chain.
1163 */
1164 n->m_next = m;
1165 m = n;
1166 }
1167 return m;
1168 #undef TO_BE_RECLAIMED
1169 }
1170
1171 /*
1172 * Return the transmit key to use in sending a unicast frame.
1173 * If a unicast key is set we use that. When no unicast key is set
1174 * we fall back to the default transmit key.
1175 */
1176 static __inline struct ieee80211_key *
ieee80211_crypto_getucastkey(struct ieee80211vap * vap,struct ieee80211_node * ni)1177 ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
1178 struct ieee80211_node *ni)
1179 {
1180 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
1181 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
1182 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
1183 return NULL;
1184 return &vap->iv_nw_keys[vap->iv_def_txkey];
1185 } else {
1186 return &ni->ni_ucastkey;
1187 }
1188 }
1189
1190 /*
1191 * Return the transmit key to use in sending a multicast frame.
1192 * Multicast traffic always uses the group key which is installed as
1193 * the default tx key.
1194 */
1195 static __inline struct ieee80211_key *
ieee80211_crypto_getmcastkey(struct ieee80211vap * vap,struct ieee80211_node * ni)1196 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
1197 struct ieee80211_node *ni)
1198 {
1199 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
1200 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
1201 return NULL;
1202 return &vap->iv_nw_keys[vap->iv_def_txkey];
1203 }
1204
1205 /*
1206 * Encapsulate an outbound data frame. The mbuf chain is updated.
1207 * If an error is encountered NULL is returned. The caller is required
1208 * to provide a node reference and pullup the ethernet header in the
1209 * first mbuf.
1210 *
1211 * NB: Packet is assumed to be processed by ieee80211_classify which
1212 * marked EAPOL frames w/ M_EAPOL.
1213 */
1214 struct mbuf *
ieee80211_encap(struct ieee80211vap * vap,struct ieee80211_node * ni,struct mbuf * m)1215 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
1216 struct mbuf *m)
1217 {
1218 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
1219 #define MC01(mc) ((struct ieee80211_meshcntl_ae01 *)mc)
1220 struct ieee80211com *ic = ni->ni_ic;
1221 #ifdef IEEE80211_SUPPORT_MESH
1222 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1223 struct ieee80211_meshcntl_ae10 *mc;
1224 struct ieee80211_mesh_route *rt = NULL;
1225 int dir = -1;
1226 #endif
1227 struct ether_header eh;
1228 struct ieee80211_frame *wh;
1229 struct ieee80211_key *key;
1230 struct llc *llc;
1231 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr;
1232 ieee80211_seq seqno;
1233 int meshhdrsize, meshae;
1234 uint8_t *qos;
1235 int is_amsdu = 0;
1236
1237 IEEE80211_TX_LOCK_ASSERT(ic);
1238
1239 /*
1240 * Copy existing Ethernet header to a safe place. The
1241 * rest of the code assumes it's ok to strip it when
1242 * reorganizing state for the final encapsulation.
1243 */
1244 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
1245 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
1246
1247 /*
1248 * Insure space for additional headers. First identify
1249 * transmit key to use in calculating any buffer adjustments
1250 * required. This is also used below to do privacy
1251 * encapsulation work. Then calculate the 802.11 header
1252 * size and any padding required by the driver.
1253 *
1254 * Note key may be NULL if we fall back to the default
1255 * transmit key and that is not set. In that case the
1256 * buffer may not be expanded as needed by the cipher
1257 * routines, but they will/should discard it.
1258 */
1259 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
1260 if (vap->iv_opmode == IEEE80211_M_STA ||
1261 !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
1262 (vap->iv_opmode == IEEE80211_M_WDS &&
1263 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)))
1264 key = ieee80211_crypto_getucastkey(vap, ni);
1265 else
1266 key = ieee80211_crypto_getmcastkey(vap, ni);
1267 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
1268 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
1269 eh.ether_dhost,
1270 "no default transmit key (%s) deftxkey %u",
1271 __func__, vap->iv_def_txkey);
1272 vap->iv_stats.is_tx_nodefkey++;
1273 goto bad;
1274 }
1275 } else
1276 key = NULL;
1277 /*
1278 * XXX Some ap's don't handle QoS-encapsulated EAPOL
1279 * frames so suppress use. This may be an issue if other
1280 * ap's require all data frames to be QoS-encapsulated
1281 * once negotiated in which case we'll need to make this
1282 * configurable.
1283 * NB: mesh data frames are QoS.
1284 */
1285 addqos = ((ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) ||
1286 (vap->iv_opmode == IEEE80211_M_MBSS)) &&
1287 (m->m_flags & M_EAPOL) == 0;
1288 if (addqos)
1289 hdrsize = sizeof(struct ieee80211_qosframe);
1290 else
1291 hdrsize = sizeof(struct ieee80211_frame);
1292 #ifdef IEEE80211_SUPPORT_MESH
1293 if (vap->iv_opmode == IEEE80211_M_MBSS) {
1294 /*
1295 * Mesh data frames are encapsulated according to the
1296 * rules of Section 11B.8.5 (p.139 of D3.0 spec).
1297 * o Group Addressed data (aka multicast) originating
1298 * at the local sta are sent w/ 3-address format and
1299 * address extension mode 00
1300 * o Individually Addressed data (aka unicast) originating
1301 * at the local sta are sent w/ 4-address format and
1302 * address extension mode 00
1303 * o Group Addressed data forwarded from a non-mesh sta are
1304 * sent w/ 3-address format and address extension mode 01
1305 * o Individually Address data from another sta are sent
1306 * w/ 4-address format and address extension mode 10
1307 */
1308 is4addr = 0; /* NB: don't use, disable */
1309 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost)) {
1310 rt = ieee80211_mesh_rt_find(vap, eh.ether_dhost);
1311 KASSERT(rt != NULL, ("route is NULL"));
1312 dir = IEEE80211_FC1_DIR_DSTODS;
1313 hdrsize += IEEE80211_ADDR_LEN;
1314 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1315 if (IEEE80211_ADDR_EQ(rt->rt_mesh_gate,
1316 vap->iv_myaddr)) {
1317 IEEE80211_NOTE_MAC(vap,
1318 IEEE80211_MSG_MESH,
1319 eh.ether_dhost,
1320 "%s", "trying to send to ourself");
1321 goto bad;
1322 }
1323 meshae = IEEE80211_MESH_AE_10;
1324 meshhdrsize =
1325 sizeof(struct ieee80211_meshcntl_ae10);
1326 } else {
1327 meshae = IEEE80211_MESH_AE_00;
1328 meshhdrsize =
1329 sizeof(struct ieee80211_meshcntl);
1330 }
1331 } else {
1332 dir = IEEE80211_FC1_DIR_FROMDS;
1333 if (!IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) {
1334 /* proxy group */
1335 meshae = IEEE80211_MESH_AE_01;
1336 meshhdrsize =
1337 sizeof(struct ieee80211_meshcntl_ae01);
1338 } else {
1339 /* group */
1340 meshae = IEEE80211_MESH_AE_00;
1341 meshhdrsize = sizeof(struct ieee80211_meshcntl);
1342 }
1343 }
1344 } else {
1345 #endif
1346 /*
1347 * 4-address frames need to be generated for:
1348 * o packets sent through a WDS vap (IEEE80211_M_WDS)
1349 * o packets sent through a vap marked for relaying
1350 * (e.g. a station operating with dynamic WDS)
1351 */
1352 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
1353 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
1354 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
1355 if (is4addr)
1356 hdrsize += IEEE80211_ADDR_LEN;
1357 meshhdrsize = meshae = 0;
1358 #ifdef IEEE80211_SUPPORT_MESH
1359 }
1360 #endif
1361 /*
1362 * Honor driver DATAPAD requirement.
1363 */
1364 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1365 hdrspace = roundup(hdrsize, sizeof(uint32_t));
1366 else
1367 hdrspace = hdrsize;
1368
1369 if (__predict_true((m->m_flags & M_FF) == 0)) {
1370 /*
1371 * Normal frame.
1372 */
1373 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m);
1374 if (m == NULL) {
1375 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
1376 goto bad;
1377 }
1378 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
1379 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
1380 llc = mtod(m, struct llc *);
1381 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
1382 llc->llc_control = LLC_UI;
1383 llc->llc_snap.org_code[0] = 0;
1384 llc->llc_snap.org_code[1] = 0;
1385 llc->llc_snap.org_code[2] = 0;
1386 llc->llc_snap.ether_type = eh.ether_type;
1387 } else {
1388 #ifdef IEEE80211_SUPPORT_SUPERG
1389 /*
1390 * Aggregated frame. Check if it's for AMSDU or FF.
1391 *
1392 * XXX TODO: IEEE80211_NODE_AMSDU* isn't implemented
1393 * anywhere for some reason. But, since 11n requires
1394 * AMSDU RX, we can just assume "11n" == "AMSDU".
1395 */
1396 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG, "%s: called; M_FF\n", __func__);
1397 if (ieee80211_amsdu_tx_ok(ni)) {
1398 m = ieee80211_amsdu_encap(vap, m, hdrspace + meshhdrsize, key);
1399 is_amsdu = 1;
1400 } else {
1401 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key);
1402 }
1403 if (m == NULL)
1404 #endif
1405 goto bad;
1406 }
1407 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
1408
1409 M_PREPEND(m, hdrspace + meshhdrsize, M_NOWAIT);
1410 if (m == NULL) {
1411 vap->iv_stats.is_tx_nobuf++;
1412 goto bad;
1413 }
1414 wh = mtod(m, struct ieee80211_frame *);
1415 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
1416 *(uint16_t *)wh->i_dur = 0;
1417 qos = NULL; /* NB: quiet compiler */
1418 if (is4addr) {
1419 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1420 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1421 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1422 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1423 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
1424 } else switch (vap->iv_opmode) {
1425 case IEEE80211_M_STA:
1426 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
1427 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
1428 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1429 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1430 break;
1431 case IEEE80211_M_IBSS:
1432 case IEEE80211_M_AHDEMO:
1433 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1434 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1435 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1436 /*
1437 * NB: always use the bssid from iv_bss as the
1438 * neighbor's may be stale after an ibss merge
1439 */
1440 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
1441 break;
1442 case IEEE80211_M_HOSTAP:
1443 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1444 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1445 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
1446 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
1447 break;
1448 #ifdef IEEE80211_SUPPORT_MESH
1449 case IEEE80211_M_MBSS:
1450 /* NB: offset by hdrspace to deal with DATAPAD */
1451 mc = (struct ieee80211_meshcntl_ae10 *)
1452 (mtod(m, uint8_t *) + hdrspace);
1453 wh->i_fc[1] = dir;
1454 switch (meshae) {
1455 case IEEE80211_MESH_AE_00: /* no proxy */
1456 mc->mc_flags = 0;
1457 if (dir == IEEE80211_FC1_DIR_DSTODS) { /* ucast */
1458 IEEE80211_ADDR_COPY(wh->i_addr1,
1459 ni->ni_macaddr);
1460 IEEE80211_ADDR_COPY(wh->i_addr2,
1461 vap->iv_myaddr);
1462 IEEE80211_ADDR_COPY(wh->i_addr3,
1463 eh.ether_dhost);
1464 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4,
1465 eh.ether_shost);
1466 qos =((struct ieee80211_qosframe_addr4 *)
1467 wh)->i_qos;
1468 } else if (dir == IEEE80211_FC1_DIR_FROMDS) {
1469 /* mcast */
1470 IEEE80211_ADDR_COPY(wh->i_addr1,
1471 eh.ether_dhost);
1472 IEEE80211_ADDR_COPY(wh->i_addr2,
1473 vap->iv_myaddr);
1474 IEEE80211_ADDR_COPY(wh->i_addr3,
1475 eh.ether_shost);
1476 qos = ((struct ieee80211_qosframe *)
1477 wh)->i_qos;
1478 }
1479 break;
1480 case IEEE80211_MESH_AE_01: /* mcast, proxy */
1481 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1482 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1483 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1484 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr);
1485 mc->mc_flags = 1;
1486 IEEE80211_ADDR_COPY(MC01(mc)->mc_addr4,
1487 eh.ether_shost);
1488 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1489 break;
1490 case IEEE80211_MESH_AE_10: /* ucast, proxy */
1491 KASSERT(rt != NULL, ("route is NULL"));
1492 IEEE80211_ADDR_COPY(wh->i_addr1, rt->rt_nexthop);
1493 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1494 IEEE80211_ADDR_COPY(wh->i_addr3, rt->rt_mesh_gate);
1495 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr);
1496 mc->mc_flags = IEEE80211_MESH_AE_10;
1497 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_dhost);
1498 IEEE80211_ADDR_COPY(mc->mc_addr6, eh.ether_shost);
1499 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1500 break;
1501 default:
1502 KASSERT(0, ("meshae %d", meshae));
1503 break;
1504 }
1505 mc->mc_ttl = ms->ms_ttl;
1506 ms->ms_seq++;
1507 le32enc(mc->mc_seq, ms->ms_seq);
1508 break;
1509 #endif
1510 case IEEE80211_M_WDS: /* NB: is4addr should always be true */
1511 default:
1512 goto bad;
1513 }
1514 if (m->m_flags & M_MORE_DATA)
1515 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
1516 if (addqos) {
1517 int ac, tid;
1518
1519 if (is4addr) {
1520 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1521 /* NB: mesh case handled earlier */
1522 } else if (vap->iv_opmode != IEEE80211_M_MBSS)
1523 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1524 ac = M_WME_GETAC(m);
1525 /* map from access class/queue to 11e header priorty value */
1526 tid = WME_AC_TO_TID(ac);
1527 qos[0] = tid & IEEE80211_QOS_TID;
1528 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
1529 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
1530 #ifdef IEEE80211_SUPPORT_MESH
1531 if (vap->iv_opmode == IEEE80211_M_MBSS)
1532 qos[1] = IEEE80211_QOS_MC;
1533 else
1534 #endif
1535 qos[1] = 0;
1536 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
1537
1538 /*
1539 * If this is an A-MSDU then ensure we set the
1540 * relevant field.
1541 */
1542 if (is_amsdu)
1543 qos[0] |= IEEE80211_QOS_AMSDU;
1544
1545 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
1546 /*
1547 * NB: don't assign a sequence # to potential
1548 * aggregates; we expect this happens at the
1549 * point the frame comes off any aggregation q
1550 * as otherwise we may introduce holes in the
1551 * BA sequence space and/or make window accouting
1552 * more difficult.
1553 *
1554 * XXX may want to control this with a driver
1555 * capability; this may also change when we pull
1556 * aggregation up into net80211
1557 */
1558 seqno = ni->ni_txseqs[tid]++;
1559 *(uint16_t *)wh->i_seq =
1560 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1561 M_SEQNO_SET(m, seqno);
1562 }
1563 } else {
1564 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
1565 *(uint16_t *)wh->i_seq =
1566 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1567 M_SEQNO_SET(m, seqno);
1568
1569 /*
1570 * XXX TODO: we shouldn't allow EAPOL, etc that would
1571 * be forced to be non-QoS traffic to be A-MSDU encapsulated.
1572 */
1573 if (is_amsdu)
1574 printf("%s: XXX ERROR: is_amsdu set; not QoS!\n",
1575 __func__);
1576 }
1577
1578
1579 /* check if xmit fragmentation is required */
1580 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
1581 !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
1582 (vap->iv_caps & IEEE80211_C_TXFRAG) &&
1583 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
1584 if (key != NULL) {
1585 /*
1586 * IEEE 802.1X: send EAPOL frames always in the clear.
1587 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
1588 */
1589 if ((m->m_flags & M_EAPOL) == 0 ||
1590 ((vap->iv_flags & IEEE80211_F_WPA) &&
1591 (vap->iv_opmode == IEEE80211_M_STA ?
1592 !IEEE80211_KEY_UNDEFINED(key) :
1593 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
1594 wh->i_fc[1] |= IEEE80211_FC1_PROTECTED;
1595 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
1596 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
1597 eh.ether_dhost,
1598 "%s", "enmic failed, discard frame");
1599 vap->iv_stats.is_crypto_enmicfail++;
1600 goto bad;
1601 }
1602 }
1603 }
1604 if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
1605 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
1606 goto bad;
1607
1608 m->m_flags |= M_ENCAP; /* mark encapsulated */
1609
1610 IEEE80211_NODE_STAT(ni, tx_data);
1611 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1612 IEEE80211_NODE_STAT(ni, tx_mcast);
1613 m->m_flags |= M_MCAST;
1614 } else
1615 IEEE80211_NODE_STAT(ni, tx_ucast);
1616 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
1617
1618 return m;
1619 bad:
1620 if (m != NULL)
1621 m_freem(m);
1622 return NULL;
1623 #undef WH4
1624 #undef MC01
1625 }
1626
1627 void
ieee80211_free_mbuf(struct mbuf * m)1628 ieee80211_free_mbuf(struct mbuf *m)
1629 {
1630 struct mbuf *next;
1631
1632 if (m == NULL)
1633 return;
1634
1635 do {
1636 next = m->m_nextpkt;
1637 m->m_nextpkt = NULL;
1638 m_freem(m);
1639 } while ((m = next) != NULL);
1640 }
1641
1642 /*
1643 * Fragment the frame according to the specified mtu.
1644 * The size of the 802.11 header (w/o padding) is provided
1645 * so we don't need to recalculate it. We create a new
1646 * mbuf for each fragment and chain it through m_nextpkt;
1647 * we might be able to optimize this by reusing the original
1648 * packet's mbufs but that is significantly more complicated.
1649 */
1650 static int
ieee80211_fragment(struct ieee80211vap * vap,struct mbuf * m0,u_int hdrsize,u_int ciphdrsize,u_int mtu)1651 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
1652 u_int hdrsize, u_int ciphdrsize, u_int mtu)
1653 {
1654 struct ieee80211com *ic = vap->iv_ic;
1655 struct ieee80211_frame *wh, *whf;
1656 struct mbuf *m, *prev;
1657 u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
1658 u_int hdrspace;
1659
1660 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
1661 KASSERT(m0->m_pkthdr.len > mtu,
1662 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
1663
1664 /*
1665 * Honor driver DATAPAD requirement.
1666 */
1667 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1668 hdrspace = roundup(hdrsize, sizeof(uint32_t));
1669 else
1670 hdrspace = hdrsize;
1671
1672 wh = mtod(m0, struct ieee80211_frame *);
1673 /* NB: mark the first frag; it will be propagated below */
1674 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
1675 totalhdrsize = hdrspace + ciphdrsize;
1676 fragno = 1;
1677 off = mtu - ciphdrsize;
1678 remainder = m0->m_pkthdr.len - off;
1679 prev = m0;
1680 do {
1681 fragsize = MIN(totalhdrsize + remainder, mtu);
1682 m = m_get2(fragsize, M_NOWAIT, MT_DATA, M_PKTHDR);
1683 if (m == NULL)
1684 goto bad;
1685 /* leave room to prepend any cipher header */
1686 m_align(m, fragsize - ciphdrsize);
1687
1688 /*
1689 * Form the header in the fragment. Note that since
1690 * we mark the first fragment with the MORE_FRAG bit
1691 * it automatically is propagated to each fragment; we
1692 * need only clear it on the last fragment (done below).
1693 * NB: frag 1+ dont have Mesh Control field present.
1694 */
1695 whf = mtod(m, struct ieee80211_frame *);
1696 memcpy(whf, wh, hdrsize);
1697 #ifdef IEEE80211_SUPPORT_MESH
1698 if (vap->iv_opmode == IEEE80211_M_MBSS)
1699 ieee80211_getqos(wh)[1] &= ~IEEE80211_QOS_MC;
1700 #endif
1701 *(uint16_t *)&whf->i_seq[0] |= htole16(
1702 (fragno & IEEE80211_SEQ_FRAG_MASK) <<
1703 IEEE80211_SEQ_FRAG_SHIFT);
1704 fragno++;
1705
1706 payload = fragsize - totalhdrsize;
1707 /* NB: destination is known to be contiguous */
1708
1709 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrspace);
1710 m->m_len = hdrspace + payload;
1711 m->m_pkthdr.len = hdrspace + payload;
1712 m->m_flags |= M_FRAG;
1713
1714 /* chain up the fragment */
1715 prev->m_nextpkt = m;
1716 prev = m;
1717
1718 /* deduct fragment just formed */
1719 remainder -= payload;
1720 off += payload;
1721 } while (remainder != 0);
1722
1723 /* set the last fragment */
1724 m->m_flags |= M_LASTFRAG;
1725 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
1726
1727 /* strip first mbuf now that everything has been copied */
1728 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
1729 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1730
1731 vap->iv_stats.is_tx_fragframes++;
1732 vap->iv_stats.is_tx_frags += fragno-1;
1733
1734 return 1;
1735 bad:
1736 /* reclaim fragments but leave original frame for caller to free */
1737 ieee80211_free_mbuf(m0->m_nextpkt);
1738 m0->m_nextpkt = NULL;
1739 return 0;
1740 }
1741
1742 /*
1743 * Add a supported rates element id to a frame.
1744 */
1745 uint8_t *
ieee80211_add_rates(uint8_t * frm,const struct ieee80211_rateset * rs)1746 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
1747 {
1748 int nrates;
1749
1750 *frm++ = IEEE80211_ELEMID_RATES;
1751 nrates = rs->rs_nrates;
1752 if (nrates > IEEE80211_RATE_SIZE)
1753 nrates = IEEE80211_RATE_SIZE;
1754 *frm++ = nrates;
1755 memcpy(frm, rs->rs_rates, nrates);
1756 return frm + nrates;
1757 }
1758
1759 /*
1760 * Add an extended supported rates element id to a frame.
1761 */
1762 uint8_t *
ieee80211_add_xrates(uint8_t * frm,const struct ieee80211_rateset * rs)1763 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
1764 {
1765 /*
1766 * Add an extended supported rates element if operating in 11g mode.
1767 */
1768 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
1769 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
1770 *frm++ = IEEE80211_ELEMID_XRATES;
1771 *frm++ = nrates;
1772 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
1773 frm += nrates;
1774 }
1775 return frm;
1776 }
1777
1778 /*
1779 * Add an ssid element to a frame.
1780 */
1781 uint8_t *
ieee80211_add_ssid(uint8_t * frm,const uint8_t * ssid,u_int len)1782 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
1783 {
1784 *frm++ = IEEE80211_ELEMID_SSID;
1785 *frm++ = len;
1786 memcpy(frm, ssid, len);
1787 return frm + len;
1788 }
1789
1790 /*
1791 * Add an erp element to a frame.
1792 */
1793 static uint8_t *
ieee80211_add_erp(uint8_t * frm,struct ieee80211com * ic)1794 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
1795 {
1796 uint8_t erp;
1797
1798 *frm++ = IEEE80211_ELEMID_ERP;
1799 *frm++ = 1;
1800 erp = 0;
1801 if (ic->ic_nonerpsta != 0)
1802 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
1803 if (ic->ic_flags & IEEE80211_F_USEPROT)
1804 erp |= IEEE80211_ERP_USE_PROTECTION;
1805 if (ic->ic_flags & IEEE80211_F_USEBARKER)
1806 erp |= IEEE80211_ERP_LONG_PREAMBLE;
1807 *frm++ = erp;
1808 return frm;
1809 }
1810
1811 /*
1812 * Add a CFParams element to a frame.
1813 */
1814 static uint8_t *
ieee80211_add_cfparms(uint8_t * frm,struct ieee80211com * ic)1815 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
1816 {
1817 #define ADDSHORT(frm, v) do { \
1818 le16enc(frm, v); \
1819 frm += 2; \
1820 } while (0)
1821 *frm++ = IEEE80211_ELEMID_CFPARMS;
1822 *frm++ = 6;
1823 *frm++ = 0; /* CFP count */
1824 *frm++ = 2; /* CFP period */
1825 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */
1826 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */
1827 return frm;
1828 #undef ADDSHORT
1829 }
1830
1831 static __inline uint8_t *
add_appie(uint8_t * frm,const struct ieee80211_appie * ie)1832 add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
1833 {
1834 memcpy(frm, ie->ie_data, ie->ie_len);
1835 return frm + ie->ie_len;
1836 }
1837
1838 static __inline uint8_t *
add_ie(uint8_t * frm,const uint8_t * ie)1839 add_ie(uint8_t *frm, const uint8_t *ie)
1840 {
1841 memcpy(frm, ie, 2 + ie[1]);
1842 return frm + 2 + ie[1];
1843 }
1844
1845 #define WME_OUI_BYTES 0x00, 0x50, 0xf2
1846 /*
1847 * Add a WME information element to a frame.
1848 */
1849 uint8_t *
ieee80211_add_wme_info(uint8_t * frm,struct ieee80211_wme_state * wme)1850 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
1851 {
1852 static const struct ieee80211_wme_info info = {
1853 .wme_id = IEEE80211_ELEMID_VENDOR,
1854 .wme_len = sizeof(struct ieee80211_wme_info) - 2,
1855 .wme_oui = { WME_OUI_BYTES },
1856 .wme_type = WME_OUI_TYPE,
1857 .wme_subtype = WME_INFO_OUI_SUBTYPE,
1858 .wme_version = WME_VERSION,
1859 .wme_info = 0,
1860 };
1861 memcpy(frm, &info, sizeof(info));
1862 return frm + sizeof(info);
1863 }
1864
1865 /*
1866 * Add a WME parameters element to a frame.
1867 */
1868 static uint8_t *
ieee80211_add_wme_param(uint8_t * frm,struct ieee80211_wme_state * wme)1869 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
1870 {
1871 #define SM(_v, _f) (((_v) << _f##_S) & _f)
1872 #define ADDSHORT(frm, v) do { \
1873 le16enc(frm, v); \
1874 frm += 2; \
1875 } while (0)
1876 /* NB: this works 'cuz a param has an info at the front */
1877 static const struct ieee80211_wme_info param = {
1878 .wme_id = IEEE80211_ELEMID_VENDOR,
1879 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
1880 .wme_oui = { WME_OUI_BYTES },
1881 .wme_type = WME_OUI_TYPE,
1882 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
1883 .wme_version = WME_VERSION,
1884 };
1885 int i;
1886
1887 memcpy(frm, ¶m, sizeof(param));
1888 frm += __offsetof(struct ieee80211_wme_info, wme_info);
1889 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */
1890 *frm++ = 0; /* reserved field */
1891 for (i = 0; i < WME_NUM_AC; i++) {
1892 const struct wmeParams *ac =
1893 &wme->wme_bssChanParams.cap_wmeParams[i];
1894 *frm++ = SM(i, WME_PARAM_ACI)
1895 | SM(ac->wmep_acm, WME_PARAM_ACM)
1896 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
1897 ;
1898 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
1899 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
1900 ;
1901 ADDSHORT(frm, ac->wmep_txopLimit);
1902 }
1903 return frm;
1904 #undef SM
1905 #undef ADDSHORT
1906 }
1907 #undef WME_OUI_BYTES
1908
1909 /*
1910 * Add an 11h Power Constraint element to a frame.
1911 */
1912 static uint8_t *
ieee80211_add_powerconstraint(uint8_t * frm,struct ieee80211vap * vap)1913 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
1914 {
1915 const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
1916 /* XXX per-vap tx power limit? */
1917 int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
1918
1919 frm[0] = IEEE80211_ELEMID_PWRCNSTR;
1920 frm[1] = 1;
1921 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0;
1922 return frm + 3;
1923 }
1924
1925 /*
1926 * Add an 11h Power Capability element to a frame.
1927 */
1928 static uint8_t *
ieee80211_add_powercapability(uint8_t * frm,const struct ieee80211_channel * c)1929 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
1930 {
1931 frm[0] = IEEE80211_ELEMID_PWRCAP;
1932 frm[1] = 2;
1933 frm[2] = c->ic_minpower;
1934 frm[3] = c->ic_maxpower;
1935 return frm + 4;
1936 }
1937
1938 /*
1939 * Add an 11h Supported Channels element to a frame.
1940 */
1941 static uint8_t *
ieee80211_add_supportedchannels(uint8_t * frm,struct ieee80211com * ic)1942 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
1943 {
1944 static const int ielen = 26;
1945
1946 frm[0] = IEEE80211_ELEMID_SUPPCHAN;
1947 frm[1] = ielen;
1948 /* XXX not correct */
1949 memcpy(frm+2, ic->ic_chan_avail, ielen);
1950 return frm + 2 + ielen;
1951 }
1952
1953 /*
1954 * Add an 11h Quiet time element to a frame.
1955 */
1956 static uint8_t *
ieee80211_add_quiet(uint8_t * frm,struct ieee80211vap * vap)1957 ieee80211_add_quiet(uint8_t *frm, struct ieee80211vap *vap)
1958 {
1959 struct ieee80211_quiet_ie *quiet = (struct ieee80211_quiet_ie *) frm;
1960
1961 quiet->quiet_ie = IEEE80211_ELEMID_QUIET;
1962 quiet->len = 6;
1963 if (vap->iv_quiet_count_value == 1)
1964 vap->iv_quiet_count_value = vap->iv_quiet_count;
1965 else if (vap->iv_quiet_count_value > 1)
1966 vap->iv_quiet_count_value--;
1967
1968 if (vap->iv_quiet_count_value == 0) {
1969 /* value 0 is reserved as per 802.11h standerd */
1970 vap->iv_quiet_count_value = 1;
1971 }
1972
1973 quiet->tbttcount = vap->iv_quiet_count_value;
1974 quiet->period = vap->iv_quiet_period;
1975 quiet->duration = htole16(vap->iv_quiet_duration);
1976 quiet->offset = htole16(vap->iv_quiet_offset);
1977 return frm + sizeof(*quiet);
1978 }
1979
1980 /*
1981 * Add an 11h Channel Switch Announcement element to a frame.
1982 * Note that we use the per-vap CSA count to adjust the global
1983 * counter so we can use this routine to form probe response
1984 * frames and get the current count.
1985 */
1986 static uint8_t *
ieee80211_add_csa(uint8_t * frm,struct ieee80211vap * vap)1987 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
1988 {
1989 struct ieee80211com *ic = vap->iv_ic;
1990 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
1991
1992 csa->csa_ie = IEEE80211_ELEMID_CSA;
1993 csa->csa_len = 3;
1994 csa->csa_mode = 1; /* XXX force quiet on channel */
1995 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
1996 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
1997 return frm + sizeof(*csa);
1998 }
1999
2000 /*
2001 * Add an 11h country information element to a frame.
2002 */
2003 static uint8_t *
ieee80211_add_countryie(uint8_t * frm,struct ieee80211com * ic)2004 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
2005 {
2006
2007 if (ic->ic_countryie == NULL ||
2008 ic->ic_countryie_chan != ic->ic_bsschan) {
2009 /*
2010 * Handle lazy construction of ie. This is done on
2011 * first use and after a channel change that requires
2012 * re-calculation.
2013 */
2014 if (ic->ic_countryie != NULL)
2015 IEEE80211_FREE(ic->ic_countryie, M_80211_NODE_IE);
2016 ic->ic_countryie = ieee80211_alloc_countryie(ic);
2017 if (ic->ic_countryie == NULL)
2018 return frm;
2019 ic->ic_countryie_chan = ic->ic_bsschan;
2020 }
2021 return add_appie(frm, ic->ic_countryie);
2022 }
2023
2024 uint8_t *
ieee80211_add_wpa(uint8_t * frm,const struct ieee80211vap * vap)2025 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap)
2026 {
2027 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL)
2028 return (add_ie(frm, vap->iv_wpa_ie));
2029 else {
2030 /* XXX else complain? */
2031 return (frm);
2032 }
2033 }
2034
2035 uint8_t *
ieee80211_add_rsn(uint8_t * frm,const struct ieee80211vap * vap)2036 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap)
2037 {
2038 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL)
2039 return (add_ie(frm, vap->iv_rsn_ie));
2040 else {
2041 /* XXX else complain? */
2042 return (frm);
2043 }
2044 }
2045
2046 uint8_t *
ieee80211_add_qos(uint8_t * frm,const struct ieee80211_node * ni)2047 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni)
2048 {
2049 if (ni->ni_flags & IEEE80211_NODE_QOS) {
2050 *frm++ = IEEE80211_ELEMID_QOS;
2051 *frm++ = 1;
2052 *frm++ = 0;
2053 }
2054
2055 return (frm);
2056 }
2057
2058 /*
2059 * Send a probe request frame with the specified ssid
2060 * and any optional information element data.
2061 */
2062 int
ieee80211_send_probereq(struct ieee80211_node * ni,const uint8_t sa[IEEE80211_ADDR_LEN],const uint8_t da[IEEE80211_ADDR_LEN],const uint8_t bssid[IEEE80211_ADDR_LEN],const uint8_t * ssid,size_t ssidlen)2063 ieee80211_send_probereq(struct ieee80211_node *ni,
2064 const uint8_t sa[IEEE80211_ADDR_LEN],
2065 const uint8_t da[IEEE80211_ADDR_LEN],
2066 const uint8_t bssid[IEEE80211_ADDR_LEN],
2067 const uint8_t *ssid, size_t ssidlen)
2068 {
2069 struct ieee80211vap *vap = ni->ni_vap;
2070 struct ieee80211com *ic = ni->ni_ic;
2071 const struct ieee80211_txparam *tp;
2072 struct ieee80211_bpf_params params;
2073 const struct ieee80211_rateset *rs;
2074 struct mbuf *m;
2075 uint8_t *frm;
2076 int ret;
2077
2078 if (vap->iv_state == IEEE80211_S_CAC) {
2079 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
2080 "block %s frame in CAC state", "probe request");
2081 vap->iv_stats.is_tx_badstate++;
2082 return EIO; /* XXX */
2083 }
2084
2085 /*
2086 * Hold a reference on the node so it doesn't go away until after
2087 * the xmit is complete all the way in the driver. On error we
2088 * will remove our reference.
2089 */
2090 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2091 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2092 __func__, __LINE__,
2093 ni, ether_sprintf(ni->ni_macaddr),
2094 ieee80211_node_refcnt(ni)+1);
2095 ieee80211_ref_node(ni);
2096
2097 /*
2098 * prreq frame format
2099 * [tlv] ssid
2100 * [tlv] supported rates
2101 * [tlv] RSN (optional)
2102 * [tlv] extended supported rates
2103 * [tlv] WPA (optional)
2104 * [tlv] user-specified ie's
2105 */
2106 m = ieee80211_getmgtframe(&frm,
2107 ic->ic_headroom + sizeof(struct ieee80211_frame),
2108 2 + IEEE80211_NWID_LEN
2109 + 2 + IEEE80211_RATE_SIZE
2110 + sizeof(struct ieee80211_ie_wpa)
2111 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2112 + sizeof(struct ieee80211_ie_wpa)
2113 + (vap->iv_appie_probereq != NULL ?
2114 vap->iv_appie_probereq->ie_len : 0)
2115 );
2116 if (m == NULL) {
2117 vap->iv_stats.is_tx_nobuf++;
2118 ieee80211_free_node(ni);
2119 return ENOMEM;
2120 }
2121
2122 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
2123 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
2124 frm = ieee80211_add_rates(frm, rs);
2125 frm = ieee80211_add_rsn(frm, vap);
2126 frm = ieee80211_add_xrates(frm, rs);
2127 frm = ieee80211_add_wpa(frm, vap);
2128 if (vap->iv_appie_probereq != NULL)
2129 frm = add_appie(frm, vap->iv_appie_probereq);
2130 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2131
2132 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
2133 ("leading space %zd", M_LEADINGSPACE(m)));
2134 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
2135 if (m == NULL) {
2136 /* NB: cannot happen */
2137 ieee80211_free_node(ni);
2138 return ENOMEM;
2139 }
2140
2141 IEEE80211_TX_LOCK(ic);
2142 ieee80211_send_setup(ni, m,
2143 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
2144 IEEE80211_NONQOS_TID, sa, da, bssid);
2145 /* XXX power management? */
2146 m->m_flags |= M_ENCAP; /* mark encapsulated */
2147
2148 M_WME_SETAC(m, WME_AC_BE);
2149
2150 IEEE80211_NODE_STAT(ni, tx_probereq);
2151 IEEE80211_NODE_STAT(ni, tx_mgmt);
2152
2153 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
2154 "send probe req on channel %u bssid %s ssid \"%.*s\"\n",
2155 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid),
2156 ssidlen, ssid);
2157
2158 memset(¶ms, 0, sizeof(params));
2159 params.ibp_pri = M_WME_GETAC(m);
2160 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
2161 params.ibp_rate0 = tp->mgmtrate;
2162 if (IEEE80211_IS_MULTICAST(da)) {
2163 params.ibp_flags |= IEEE80211_BPF_NOACK;
2164 params.ibp_try0 = 1;
2165 } else
2166 params.ibp_try0 = tp->maxretry;
2167 params.ibp_power = ni->ni_txpower;
2168 ret = ieee80211_raw_output(vap, ni, m, ¶ms);
2169 IEEE80211_TX_UNLOCK(ic);
2170 return (ret);
2171 }
2172
2173 /*
2174 * Calculate capability information for mgt frames.
2175 */
2176 uint16_t
ieee80211_getcapinfo(struct ieee80211vap * vap,struct ieee80211_channel * chan)2177 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
2178 {
2179 struct ieee80211com *ic = vap->iv_ic;
2180 uint16_t capinfo;
2181
2182 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
2183
2184 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
2185 capinfo = IEEE80211_CAPINFO_ESS;
2186 else if (vap->iv_opmode == IEEE80211_M_IBSS)
2187 capinfo = IEEE80211_CAPINFO_IBSS;
2188 else
2189 capinfo = 0;
2190 if (vap->iv_flags & IEEE80211_F_PRIVACY)
2191 capinfo |= IEEE80211_CAPINFO_PRIVACY;
2192 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
2193 IEEE80211_IS_CHAN_2GHZ(chan))
2194 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
2195 if (ic->ic_flags & IEEE80211_F_SHSLOT)
2196 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
2197 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
2198 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
2199 return capinfo;
2200 }
2201
2202 /*
2203 * Send a management frame. The node is for the destination (or ic_bss
2204 * when in station mode). Nodes other than ic_bss have their reference
2205 * count bumped to reflect our use for an indeterminant time.
2206 */
2207 int
ieee80211_send_mgmt(struct ieee80211_node * ni,int type,int arg)2208 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
2209 {
2210 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
2211 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
2212 struct ieee80211vap *vap = ni->ni_vap;
2213 struct ieee80211com *ic = ni->ni_ic;
2214 struct ieee80211_node *bss = vap->iv_bss;
2215 struct ieee80211_bpf_params params;
2216 struct mbuf *m;
2217 uint8_t *frm;
2218 uint16_t capinfo;
2219 int has_challenge, is_shared_key, ret, status;
2220
2221 KASSERT(ni != NULL, ("null node"));
2222
2223 /*
2224 * Hold a reference on the node so it doesn't go away until after
2225 * the xmit is complete all the way in the driver. On error we
2226 * will remove our reference.
2227 */
2228 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2229 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2230 __func__, __LINE__,
2231 ni, ether_sprintf(ni->ni_macaddr),
2232 ieee80211_node_refcnt(ni)+1);
2233 ieee80211_ref_node(ni);
2234
2235 memset(¶ms, 0, sizeof(params));
2236 switch (type) {
2237
2238 case IEEE80211_FC0_SUBTYPE_AUTH:
2239 status = arg >> 16;
2240 arg &= 0xffff;
2241 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
2242 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
2243 ni->ni_challenge != NULL);
2244
2245 /*
2246 * Deduce whether we're doing open authentication or
2247 * shared key authentication. We do the latter if
2248 * we're in the middle of a shared key authentication
2249 * handshake or if we're initiating an authentication
2250 * request and configured to use shared key.
2251 */
2252 is_shared_key = has_challenge ||
2253 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
2254 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
2255 bss->ni_authmode == IEEE80211_AUTH_SHARED);
2256
2257 m = ieee80211_getmgtframe(&frm,
2258 ic->ic_headroom + sizeof(struct ieee80211_frame),
2259 3 * sizeof(uint16_t)
2260 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
2261 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
2262 );
2263 if (m == NULL)
2264 senderr(ENOMEM, is_tx_nobuf);
2265
2266 ((uint16_t *)frm)[0] =
2267 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
2268 : htole16(IEEE80211_AUTH_ALG_OPEN);
2269 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
2270 ((uint16_t *)frm)[2] = htole16(status);/* status */
2271
2272 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
2273 ((uint16_t *)frm)[3] =
2274 htole16((IEEE80211_CHALLENGE_LEN << 8) |
2275 IEEE80211_ELEMID_CHALLENGE);
2276 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
2277 IEEE80211_CHALLENGE_LEN);
2278 m->m_pkthdr.len = m->m_len =
2279 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
2280 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
2281 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2282 "request encrypt frame (%s)", __func__);
2283 /* mark frame for encryption */
2284 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
2285 }
2286 } else
2287 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
2288
2289 /* XXX not right for shared key */
2290 if (status == IEEE80211_STATUS_SUCCESS)
2291 IEEE80211_NODE_STAT(ni, tx_auth);
2292 else
2293 IEEE80211_NODE_STAT(ni, tx_auth_fail);
2294
2295 if (vap->iv_opmode == IEEE80211_M_STA)
2296 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
2297 (void *) vap->iv_state);
2298 break;
2299
2300 case IEEE80211_FC0_SUBTYPE_DEAUTH:
2301 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
2302 "send station deauthenticate (reason: %d (%s))", arg,
2303 ieee80211_reason_to_string(arg));
2304 m = ieee80211_getmgtframe(&frm,
2305 ic->ic_headroom + sizeof(struct ieee80211_frame),
2306 sizeof(uint16_t));
2307 if (m == NULL)
2308 senderr(ENOMEM, is_tx_nobuf);
2309 *(uint16_t *)frm = htole16(arg); /* reason */
2310 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
2311
2312 IEEE80211_NODE_STAT(ni, tx_deauth);
2313 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
2314
2315 ieee80211_node_unauthorize(ni); /* port closed */
2316 break;
2317
2318 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
2319 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2320 /*
2321 * asreq frame format
2322 * [2] capability information
2323 * [2] listen interval
2324 * [6*] current AP address (reassoc only)
2325 * [tlv] ssid
2326 * [tlv] supported rates
2327 * [tlv] extended supported rates
2328 * [4] power capability (optional)
2329 * [28] supported channels (optional)
2330 * [tlv] HT capabilities
2331 * [tlv] WME (optional)
2332 * [tlv] Vendor OUI HT capabilities (optional)
2333 * [tlv] Atheros capabilities (if negotiated)
2334 * [tlv] AppIE's (optional)
2335 */
2336 m = ieee80211_getmgtframe(&frm,
2337 ic->ic_headroom + sizeof(struct ieee80211_frame),
2338 sizeof(uint16_t)
2339 + sizeof(uint16_t)
2340 + IEEE80211_ADDR_LEN
2341 + 2 + IEEE80211_NWID_LEN
2342 + 2 + IEEE80211_RATE_SIZE
2343 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2344 + 4
2345 + 2 + 26
2346 + sizeof(struct ieee80211_wme_info)
2347 + sizeof(struct ieee80211_ie_htcap)
2348 + 4 + sizeof(struct ieee80211_ie_htcap)
2349 #ifdef IEEE80211_SUPPORT_SUPERG
2350 + sizeof(struct ieee80211_ath_ie)
2351 #endif
2352 + (vap->iv_appie_wpa != NULL ?
2353 vap->iv_appie_wpa->ie_len : 0)
2354 + (vap->iv_appie_assocreq != NULL ?
2355 vap->iv_appie_assocreq->ie_len : 0)
2356 );
2357 if (m == NULL)
2358 senderr(ENOMEM, is_tx_nobuf);
2359
2360 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
2361 ("wrong mode %u", vap->iv_opmode));
2362 capinfo = IEEE80211_CAPINFO_ESS;
2363 if (vap->iv_flags & IEEE80211_F_PRIVACY)
2364 capinfo |= IEEE80211_CAPINFO_PRIVACY;
2365 /*
2366 * NB: Some 11a AP's reject the request when
2367 * short premable is set.
2368 */
2369 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
2370 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
2371 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
2372 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
2373 (ic->ic_caps & IEEE80211_C_SHSLOT))
2374 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
2375 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
2376 (vap->iv_flags & IEEE80211_F_DOTH))
2377 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
2378 *(uint16_t *)frm = htole16(capinfo);
2379 frm += 2;
2380
2381 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
2382 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
2383 bss->ni_intval));
2384 frm += 2;
2385
2386 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2387 IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
2388 frm += IEEE80211_ADDR_LEN;
2389 }
2390
2391 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
2392 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2393 frm = ieee80211_add_rsn(frm, vap);
2394 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2395 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
2396 frm = ieee80211_add_powercapability(frm,
2397 ic->ic_curchan);
2398 frm = ieee80211_add_supportedchannels(frm, ic);
2399 }
2400
2401 /*
2402 * Check the channel - we may be using an 11n NIC with an
2403 * 11n capable station, but we're configured to be an 11b
2404 * channel.
2405 */
2406 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2407 IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
2408 ni->ni_ies.htcap_ie != NULL &&
2409 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP) {
2410 frm = ieee80211_add_htcap(frm, ni);
2411 }
2412 frm = ieee80211_add_wpa(frm, vap);
2413 if ((ic->ic_flags & IEEE80211_F_WME) &&
2414 ni->ni_ies.wme_ie != NULL)
2415 frm = ieee80211_add_wme_info(frm, &ic->ic_wme);
2416
2417 /*
2418 * Same deal - only send HT info if we're on an 11n
2419 * capable channel.
2420 */
2421 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2422 IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
2423 ni->ni_ies.htcap_ie != NULL &&
2424 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR) {
2425 frm = ieee80211_add_htcap_vendor(frm, ni);
2426 }
2427 #ifdef IEEE80211_SUPPORT_SUPERG
2428 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) {
2429 frm = ieee80211_add_ath(frm,
2430 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
2431 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
2432 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
2433 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
2434 }
2435 #endif /* IEEE80211_SUPPORT_SUPERG */
2436 if (vap->iv_appie_assocreq != NULL)
2437 frm = add_appie(frm, vap->iv_appie_assocreq);
2438 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2439
2440 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
2441 (void *) vap->iv_state);
2442 break;
2443
2444 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2445 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2446 /*
2447 * asresp frame format
2448 * [2] capability information
2449 * [2] status
2450 * [2] association ID
2451 * [tlv] supported rates
2452 * [tlv] extended supported rates
2453 * [tlv] HT capabilities (standard, if STA enabled)
2454 * [tlv] HT information (standard, if STA enabled)
2455 * [tlv] WME (if configured and STA enabled)
2456 * [tlv] HT capabilities (vendor OUI, if STA enabled)
2457 * [tlv] HT information (vendor OUI, if STA enabled)
2458 * [tlv] Atheros capabilities (if STA enabled)
2459 * [tlv] AppIE's (optional)
2460 */
2461 m = ieee80211_getmgtframe(&frm,
2462 ic->ic_headroom + sizeof(struct ieee80211_frame),
2463 sizeof(uint16_t)
2464 + sizeof(uint16_t)
2465 + sizeof(uint16_t)
2466 + 2 + IEEE80211_RATE_SIZE
2467 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2468 + sizeof(struct ieee80211_ie_htcap) + 4
2469 + sizeof(struct ieee80211_ie_htinfo) + 4
2470 + sizeof(struct ieee80211_wme_param)
2471 #ifdef IEEE80211_SUPPORT_SUPERG
2472 + sizeof(struct ieee80211_ath_ie)
2473 #endif
2474 + (vap->iv_appie_assocresp != NULL ?
2475 vap->iv_appie_assocresp->ie_len : 0)
2476 );
2477 if (m == NULL)
2478 senderr(ENOMEM, is_tx_nobuf);
2479
2480 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
2481 *(uint16_t *)frm = htole16(capinfo);
2482 frm += 2;
2483
2484 *(uint16_t *)frm = htole16(arg); /* status */
2485 frm += 2;
2486
2487 if (arg == IEEE80211_STATUS_SUCCESS) {
2488 *(uint16_t *)frm = htole16(ni->ni_associd);
2489 IEEE80211_NODE_STAT(ni, tx_assoc);
2490 } else
2491 IEEE80211_NODE_STAT(ni, tx_assoc_fail);
2492 frm += 2;
2493
2494 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2495 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2496 /* NB: respond according to what we received */
2497 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) {
2498 frm = ieee80211_add_htcap(frm, ni);
2499 frm = ieee80211_add_htinfo(frm, ni);
2500 }
2501 if ((vap->iv_flags & IEEE80211_F_WME) &&
2502 ni->ni_ies.wme_ie != NULL)
2503 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
2504 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) {
2505 frm = ieee80211_add_htcap_vendor(frm, ni);
2506 frm = ieee80211_add_htinfo_vendor(frm, ni);
2507 }
2508 #ifdef IEEE80211_SUPPORT_SUPERG
2509 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS))
2510 frm = ieee80211_add_ath(frm,
2511 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
2512 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
2513 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
2514 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
2515 #endif /* IEEE80211_SUPPORT_SUPERG */
2516 if (vap->iv_appie_assocresp != NULL)
2517 frm = add_appie(frm, vap->iv_appie_assocresp);
2518 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2519 break;
2520
2521 case IEEE80211_FC0_SUBTYPE_DISASSOC:
2522 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2523 "send station disassociate (reason: %d (%s))", arg,
2524 ieee80211_reason_to_string(arg));
2525 m = ieee80211_getmgtframe(&frm,
2526 ic->ic_headroom + sizeof(struct ieee80211_frame),
2527 sizeof(uint16_t));
2528 if (m == NULL)
2529 senderr(ENOMEM, is_tx_nobuf);
2530 *(uint16_t *)frm = htole16(arg); /* reason */
2531 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
2532
2533 IEEE80211_NODE_STAT(ni, tx_disassoc);
2534 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
2535 break;
2536
2537 default:
2538 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
2539 "invalid mgmt frame type %u", type);
2540 senderr(EINVAL, is_tx_unknownmgt);
2541 /* NOTREACHED */
2542 }
2543
2544 /* NB: force non-ProbeResp frames to the highest queue */
2545 params.ibp_pri = WME_AC_VO;
2546 params.ibp_rate0 = bss->ni_txparms->mgmtrate;
2547 /* NB: we know all frames are unicast */
2548 params.ibp_try0 = bss->ni_txparms->maxretry;
2549 params.ibp_power = bss->ni_txpower;
2550 return ieee80211_mgmt_output(ni, m, type, ¶ms);
2551 bad:
2552 ieee80211_free_node(ni);
2553 return ret;
2554 #undef senderr
2555 #undef HTFLAGS
2556 }
2557
2558 /*
2559 * Return an mbuf with a probe response frame in it.
2560 * Space is left to prepend and 802.11 header at the
2561 * front but it's left to the caller to fill in.
2562 */
2563 struct mbuf *
ieee80211_alloc_proberesp(struct ieee80211_node * bss,int legacy)2564 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy)
2565 {
2566 struct ieee80211vap *vap = bss->ni_vap;
2567 struct ieee80211com *ic = bss->ni_ic;
2568 const struct ieee80211_rateset *rs;
2569 struct mbuf *m;
2570 uint16_t capinfo;
2571 uint8_t *frm;
2572
2573 /*
2574 * probe response frame format
2575 * [8] time stamp
2576 * [2] beacon interval
2577 * [2] cabability information
2578 * [tlv] ssid
2579 * [tlv] supported rates
2580 * [tlv] parameter set (FH/DS)
2581 * [tlv] parameter set (IBSS)
2582 * [tlv] country (optional)
2583 * [3] power control (optional)
2584 * [5] channel switch announcement (CSA) (optional)
2585 * [tlv] extended rate phy (ERP)
2586 * [tlv] extended supported rates
2587 * [tlv] RSN (optional)
2588 * [tlv] HT capabilities
2589 * [tlv] HT information
2590 * [tlv] WPA (optional)
2591 * [tlv] WME (optional)
2592 * [tlv] Vendor OUI HT capabilities (optional)
2593 * [tlv] Vendor OUI HT information (optional)
2594 * [tlv] Atheros capabilities
2595 * [tlv] AppIE's (optional)
2596 * [tlv] Mesh ID (MBSS)
2597 * [tlv] Mesh Conf (MBSS)
2598 */
2599 m = ieee80211_getmgtframe(&frm,
2600 ic->ic_headroom + sizeof(struct ieee80211_frame),
2601 8
2602 + sizeof(uint16_t)
2603 + sizeof(uint16_t)
2604 + 2 + IEEE80211_NWID_LEN
2605 + 2 + IEEE80211_RATE_SIZE
2606 + 7 /* max(7,3) */
2607 + IEEE80211_COUNTRY_MAX_SIZE
2608 + 3
2609 + sizeof(struct ieee80211_csa_ie)
2610 + sizeof(struct ieee80211_quiet_ie)
2611 + 3
2612 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2613 + sizeof(struct ieee80211_ie_wpa)
2614 + sizeof(struct ieee80211_ie_htcap)
2615 + sizeof(struct ieee80211_ie_htinfo)
2616 + sizeof(struct ieee80211_ie_wpa)
2617 + sizeof(struct ieee80211_wme_param)
2618 + 4 + sizeof(struct ieee80211_ie_htcap)
2619 + 4 + sizeof(struct ieee80211_ie_htinfo)
2620 #ifdef IEEE80211_SUPPORT_SUPERG
2621 + sizeof(struct ieee80211_ath_ie)
2622 #endif
2623 #ifdef IEEE80211_SUPPORT_MESH
2624 + 2 + IEEE80211_MESHID_LEN
2625 + sizeof(struct ieee80211_meshconf_ie)
2626 #endif
2627 + (vap->iv_appie_proberesp != NULL ?
2628 vap->iv_appie_proberesp->ie_len : 0)
2629 );
2630 if (m == NULL) {
2631 vap->iv_stats.is_tx_nobuf++;
2632 return NULL;
2633 }
2634
2635 memset(frm, 0, 8); /* timestamp should be filled later */
2636 frm += 8;
2637 *(uint16_t *)frm = htole16(bss->ni_intval);
2638 frm += 2;
2639 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
2640 *(uint16_t *)frm = htole16(capinfo);
2641 frm += 2;
2642
2643 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen);
2644 rs = ieee80211_get_suprates(ic, bss->ni_chan);
2645 frm = ieee80211_add_rates(frm, rs);
2646
2647 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) {
2648 *frm++ = IEEE80211_ELEMID_FHPARMS;
2649 *frm++ = 5;
2650 *frm++ = bss->ni_fhdwell & 0x00ff;
2651 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff;
2652 *frm++ = IEEE80211_FH_CHANSET(
2653 ieee80211_chan2ieee(ic, bss->ni_chan));
2654 *frm++ = IEEE80211_FH_CHANPAT(
2655 ieee80211_chan2ieee(ic, bss->ni_chan));
2656 *frm++ = bss->ni_fhindex;
2657 } else {
2658 *frm++ = IEEE80211_ELEMID_DSPARMS;
2659 *frm++ = 1;
2660 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan);
2661 }
2662
2663 if (vap->iv_opmode == IEEE80211_M_IBSS) {
2664 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
2665 *frm++ = 2;
2666 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
2667 }
2668 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
2669 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
2670 frm = ieee80211_add_countryie(frm, ic);
2671 if (vap->iv_flags & IEEE80211_F_DOTH) {
2672 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan))
2673 frm = ieee80211_add_powerconstraint(frm, vap);
2674 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
2675 frm = ieee80211_add_csa(frm, vap);
2676 }
2677 if (vap->iv_flags & IEEE80211_F_DOTH) {
2678 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
2679 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
2680 if (vap->iv_quiet)
2681 frm = ieee80211_add_quiet(frm, vap);
2682 }
2683 }
2684 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan))
2685 frm = ieee80211_add_erp(frm, ic);
2686 frm = ieee80211_add_xrates(frm, rs);
2687 frm = ieee80211_add_rsn(frm, vap);
2688 /*
2689 * NB: legacy 11b clients do not get certain ie's.
2690 * The caller identifies such clients by passing
2691 * a token in legacy to us. Could expand this to be
2692 * any legacy client for stuff like HT ie's.
2693 */
2694 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
2695 legacy != IEEE80211_SEND_LEGACY_11B) {
2696 frm = ieee80211_add_htcap(frm, bss);
2697 frm = ieee80211_add_htinfo(frm, bss);
2698 }
2699 frm = ieee80211_add_wpa(frm, vap);
2700 if (vap->iv_flags & IEEE80211_F_WME)
2701 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
2702 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
2703 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) &&
2704 legacy != IEEE80211_SEND_LEGACY_11B) {
2705 frm = ieee80211_add_htcap_vendor(frm, bss);
2706 frm = ieee80211_add_htinfo_vendor(frm, bss);
2707 }
2708 #ifdef IEEE80211_SUPPORT_SUPERG
2709 if ((vap->iv_flags & IEEE80211_F_ATHEROS) &&
2710 legacy != IEEE80211_SEND_LEGACY_11B)
2711 frm = ieee80211_add_athcaps(frm, bss);
2712 #endif
2713 if (vap->iv_appie_proberesp != NULL)
2714 frm = add_appie(frm, vap->iv_appie_proberesp);
2715 #ifdef IEEE80211_SUPPORT_MESH
2716 if (vap->iv_opmode == IEEE80211_M_MBSS) {
2717 frm = ieee80211_add_meshid(frm, vap);
2718 frm = ieee80211_add_meshconf(frm, vap);
2719 }
2720 #endif
2721 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2722
2723 return m;
2724 }
2725
2726 /*
2727 * Send a probe response frame to the specified mac address.
2728 * This does not go through the normal mgt frame api so we
2729 * can specify the destination address and re-use the bss node
2730 * for the sta reference.
2731 */
2732 int
ieee80211_send_proberesp(struct ieee80211vap * vap,const uint8_t da[IEEE80211_ADDR_LEN],int legacy)2733 ieee80211_send_proberesp(struct ieee80211vap *vap,
2734 const uint8_t da[IEEE80211_ADDR_LEN], int legacy)
2735 {
2736 struct ieee80211_node *bss = vap->iv_bss;
2737 struct ieee80211com *ic = vap->iv_ic;
2738 struct mbuf *m;
2739 int ret;
2740
2741 if (vap->iv_state == IEEE80211_S_CAC) {
2742 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss,
2743 "block %s frame in CAC state", "probe response");
2744 vap->iv_stats.is_tx_badstate++;
2745 return EIO; /* XXX */
2746 }
2747
2748 /*
2749 * Hold a reference on the node so it doesn't go away until after
2750 * the xmit is complete all the way in the driver. On error we
2751 * will remove our reference.
2752 */
2753 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2754 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2755 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr),
2756 ieee80211_node_refcnt(bss)+1);
2757 ieee80211_ref_node(bss);
2758
2759 m = ieee80211_alloc_proberesp(bss, legacy);
2760 if (m == NULL) {
2761 ieee80211_free_node(bss);
2762 return ENOMEM;
2763 }
2764
2765 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
2766 KASSERT(m != NULL, ("no room for header"));
2767
2768 IEEE80211_TX_LOCK(ic);
2769 ieee80211_send_setup(bss, m,
2770 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP,
2771 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid);
2772 /* XXX power management? */
2773 m->m_flags |= M_ENCAP; /* mark encapsulated */
2774
2775 M_WME_SETAC(m, WME_AC_BE);
2776
2777 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
2778 "send probe resp on channel %u to %s%s\n",
2779 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da),
2780 legacy ? " <legacy>" : "");
2781 IEEE80211_NODE_STAT(bss, tx_mgmt);
2782
2783 ret = ieee80211_raw_output(vap, bss, m, NULL);
2784 IEEE80211_TX_UNLOCK(ic);
2785 return (ret);
2786 }
2787
2788 /*
2789 * Allocate and build a RTS (Request To Send) control frame.
2790 */
2791 struct mbuf *
ieee80211_alloc_rts(struct ieee80211com * ic,const uint8_t ra[IEEE80211_ADDR_LEN],const uint8_t ta[IEEE80211_ADDR_LEN],uint16_t dur)2792 ieee80211_alloc_rts(struct ieee80211com *ic,
2793 const uint8_t ra[IEEE80211_ADDR_LEN],
2794 const uint8_t ta[IEEE80211_ADDR_LEN],
2795 uint16_t dur)
2796 {
2797 struct ieee80211_frame_rts *rts;
2798 struct mbuf *m;
2799
2800 /* XXX honor ic_headroom */
2801 m = m_gethdr(M_NOWAIT, MT_DATA);
2802 if (m != NULL) {
2803 rts = mtod(m, struct ieee80211_frame_rts *);
2804 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2805 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS;
2806 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2807 *(u_int16_t *)rts->i_dur = htole16(dur);
2808 IEEE80211_ADDR_COPY(rts->i_ra, ra);
2809 IEEE80211_ADDR_COPY(rts->i_ta, ta);
2810
2811 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts);
2812 }
2813 return m;
2814 }
2815
2816 /*
2817 * Allocate and build a CTS (Clear To Send) control frame.
2818 */
2819 struct mbuf *
ieee80211_alloc_cts(struct ieee80211com * ic,const uint8_t ra[IEEE80211_ADDR_LEN],uint16_t dur)2820 ieee80211_alloc_cts(struct ieee80211com *ic,
2821 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur)
2822 {
2823 struct ieee80211_frame_cts *cts;
2824 struct mbuf *m;
2825
2826 /* XXX honor ic_headroom */
2827 m = m_gethdr(M_NOWAIT, MT_DATA);
2828 if (m != NULL) {
2829 cts = mtod(m, struct ieee80211_frame_cts *);
2830 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2831 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS;
2832 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2833 *(u_int16_t *)cts->i_dur = htole16(dur);
2834 IEEE80211_ADDR_COPY(cts->i_ra, ra);
2835
2836 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts);
2837 }
2838 return m;
2839 }
2840
2841 static void
ieee80211_tx_mgt_timeout(void * arg)2842 ieee80211_tx_mgt_timeout(void *arg)
2843 {
2844 struct ieee80211vap *vap = arg;
2845
2846 IEEE80211_LOCK(vap->iv_ic);
2847 if (vap->iv_state != IEEE80211_S_INIT &&
2848 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) {
2849 /*
2850 * NB: it's safe to specify a timeout as the reason here;
2851 * it'll only be used in the right state.
2852 */
2853 ieee80211_new_state_locked(vap, IEEE80211_S_SCAN,
2854 IEEE80211_SCAN_FAIL_TIMEOUT);
2855 }
2856 IEEE80211_UNLOCK(vap->iv_ic);
2857 }
2858
2859 /*
2860 * This is the callback set on net80211-sourced transmitted
2861 * authentication request frames.
2862 *
2863 * This does a couple of things:
2864 *
2865 * + If the frame transmitted was a success, it schedules a future
2866 * event which will transition the interface to scan.
2867 * If a state transition _then_ occurs before that event occurs,
2868 * said state transition will cancel this callout.
2869 *
2870 * + If the frame transmit was a failure, it immediately schedules
2871 * the transition back to scan.
2872 */
2873 static void
ieee80211_tx_mgt_cb(struct ieee80211_node * ni,void * arg,int status)2874 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status)
2875 {
2876 struct ieee80211vap *vap = ni->ni_vap;
2877 enum ieee80211_state ostate = (enum ieee80211_state)(uintptr_t)arg;
2878
2879 /*
2880 * Frame transmit completed; arrange timer callback. If
2881 * transmit was successfully we wait for response. Otherwise
2882 * we arrange an immediate callback instead of doing the
2883 * callback directly since we don't know what state the driver
2884 * is in (e.g. what locks it is holding). This work should
2885 * not be too time-critical and not happen too often so the
2886 * added overhead is acceptable.
2887 *
2888 * XXX what happens if !acked but response shows up before callback?
2889 */
2890 if (vap->iv_state == ostate) {
2891 callout_reset(&vap->iv_mgtsend,
2892 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0,
2893 ieee80211_tx_mgt_timeout, vap);
2894 }
2895 }
2896
2897 static void
ieee80211_beacon_construct(struct mbuf * m,uint8_t * frm,struct ieee80211_node * ni)2898 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm,
2899 struct ieee80211_node *ni)
2900 {
2901 struct ieee80211vap *vap = ni->ni_vap;
2902 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
2903 struct ieee80211com *ic = ni->ni_ic;
2904 struct ieee80211_rateset *rs = &ni->ni_rates;
2905 uint16_t capinfo;
2906
2907 /*
2908 * beacon frame format
2909 * [8] time stamp
2910 * [2] beacon interval
2911 * [2] cabability information
2912 * [tlv] ssid
2913 * [tlv] supported rates
2914 * [3] parameter set (DS)
2915 * [8] CF parameter set (optional)
2916 * [tlv] parameter set (IBSS/TIM)
2917 * [tlv] country (optional)
2918 * [3] power control (optional)
2919 * [5] channel switch announcement (CSA) (optional)
2920 * [tlv] extended rate phy (ERP)
2921 * [tlv] extended supported rates
2922 * [tlv] RSN parameters
2923 * [tlv] HT capabilities
2924 * [tlv] HT information
2925 * XXX Vendor-specific OIDs (e.g. Atheros)
2926 * [tlv] WPA parameters
2927 * [tlv] WME parameters
2928 * [tlv] Vendor OUI HT capabilities (optional)
2929 * [tlv] Vendor OUI HT information (optional)
2930 * [tlv] Atheros capabilities (optional)
2931 * [tlv] TDMA parameters (optional)
2932 * [tlv] Mesh ID (MBSS)
2933 * [tlv] Mesh Conf (MBSS)
2934 * [tlv] application data (optional)
2935 */
2936
2937 memset(bo, 0, sizeof(*bo));
2938
2939 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */
2940 frm += 8;
2941 *(uint16_t *)frm = htole16(ni->ni_intval);
2942 frm += 2;
2943 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
2944 bo->bo_caps = (uint16_t *)frm;
2945 *(uint16_t *)frm = htole16(capinfo);
2946 frm += 2;
2947 *frm++ = IEEE80211_ELEMID_SSID;
2948 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) {
2949 *frm++ = ni->ni_esslen;
2950 memcpy(frm, ni->ni_essid, ni->ni_esslen);
2951 frm += ni->ni_esslen;
2952 } else
2953 *frm++ = 0;
2954 frm = ieee80211_add_rates(frm, rs);
2955 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) {
2956 *frm++ = IEEE80211_ELEMID_DSPARMS;
2957 *frm++ = 1;
2958 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2959 }
2960 if (ic->ic_flags & IEEE80211_F_PCF) {
2961 bo->bo_cfp = frm;
2962 frm = ieee80211_add_cfparms(frm, ic);
2963 }
2964 bo->bo_tim = frm;
2965 if (vap->iv_opmode == IEEE80211_M_IBSS) {
2966 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
2967 *frm++ = 2;
2968 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
2969 bo->bo_tim_len = 0;
2970 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
2971 vap->iv_opmode == IEEE80211_M_MBSS) {
2972 /* TIM IE is the same for Mesh and Hostap */
2973 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
2974
2975 tie->tim_ie = IEEE80211_ELEMID_TIM;
2976 tie->tim_len = 4; /* length */
2977 tie->tim_count = 0; /* DTIM count */
2978 tie->tim_period = vap->iv_dtim_period; /* DTIM period */
2979 tie->tim_bitctl = 0; /* bitmap control */
2980 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
2981 frm += sizeof(struct ieee80211_tim_ie);
2982 bo->bo_tim_len = 1;
2983 }
2984 bo->bo_tim_trailer = frm;
2985 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
2986 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
2987 frm = ieee80211_add_countryie(frm, ic);
2988 if (vap->iv_flags & IEEE80211_F_DOTH) {
2989 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
2990 frm = ieee80211_add_powerconstraint(frm, vap);
2991 bo->bo_csa = frm;
2992 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
2993 frm = ieee80211_add_csa(frm, vap);
2994 } else
2995 bo->bo_csa = frm;
2996
2997 if (vap->iv_flags & IEEE80211_F_DOTH) {
2998 bo->bo_quiet = frm;
2999 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
3000 (vap->iv_flags_ext & IEEE80211_FEXT_DFS)) {
3001 if (vap->iv_quiet)
3002 frm = ieee80211_add_quiet(frm,vap);
3003 }
3004 } else
3005 bo->bo_quiet = frm;
3006
3007 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) {
3008 bo->bo_erp = frm;
3009 frm = ieee80211_add_erp(frm, ic);
3010 }
3011 frm = ieee80211_add_xrates(frm, rs);
3012 frm = ieee80211_add_rsn(frm, vap);
3013 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) {
3014 frm = ieee80211_add_htcap(frm, ni);
3015 bo->bo_htinfo = frm;
3016 frm = ieee80211_add_htinfo(frm, ni);
3017 }
3018 frm = ieee80211_add_wpa(frm, vap);
3019 if (vap->iv_flags & IEEE80211_F_WME) {
3020 bo->bo_wme = frm;
3021 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
3022 }
3023 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
3024 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) {
3025 frm = ieee80211_add_htcap_vendor(frm, ni);
3026 frm = ieee80211_add_htinfo_vendor(frm, ni);
3027 }
3028 #ifdef IEEE80211_SUPPORT_SUPERG
3029 if (vap->iv_flags & IEEE80211_F_ATHEROS) {
3030 bo->bo_ath = frm;
3031 frm = ieee80211_add_athcaps(frm, ni);
3032 }
3033 #endif
3034 #ifdef IEEE80211_SUPPORT_TDMA
3035 if (vap->iv_caps & IEEE80211_C_TDMA) {
3036 bo->bo_tdma = frm;
3037 frm = ieee80211_add_tdma(frm, vap);
3038 }
3039 #endif
3040 if (vap->iv_appie_beacon != NULL) {
3041 bo->bo_appie = frm;
3042 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
3043 frm = add_appie(frm, vap->iv_appie_beacon);
3044 }
3045 #ifdef IEEE80211_SUPPORT_MESH
3046 if (vap->iv_opmode == IEEE80211_M_MBSS) {
3047 frm = ieee80211_add_meshid(frm, vap);
3048 bo->bo_meshconf = frm;
3049 frm = ieee80211_add_meshconf(frm, vap);
3050 }
3051 #endif
3052 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
3053 bo->bo_csa_trailer_len = frm - bo->bo_csa;
3054 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
3055 }
3056
3057 /*
3058 * Allocate a beacon frame and fillin the appropriate bits.
3059 */
3060 struct mbuf *
ieee80211_beacon_alloc(struct ieee80211_node * ni)3061 ieee80211_beacon_alloc(struct ieee80211_node *ni)
3062 {
3063 struct ieee80211vap *vap = ni->ni_vap;
3064 struct ieee80211com *ic = ni->ni_ic;
3065 struct ifnet *ifp = vap->iv_ifp;
3066 struct ieee80211_frame *wh;
3067 struct mbuf *m;
3068 int pktlen;
3069 uint8_t *frm;
3070
3071 /*
3072 * beacon frame format
3073 * [8] time stamp
3074 * [2] beacon interval
3075 * [2] cabability information
3076 * [tlv] ssid
3077 * [tlv] supported rates
3078 * [3] parameter set (DS)
3079 * [8] CF parameter set (optional)
3080 * [tlv] parameter set (IBSS/TIM)
3081 * [tlv] country (optional)
3082 * [3] power control (optional)
3083 * [5] channel switch announcement (CSA) (optional)
3084 * [tlv] extended rate phy (ERP)
3085 * [tlv] extended supported rates
3086 * [tlv] RSN parameters
3087 * [tlv] HT capabilities
3088 * [tlv] HT information
3089 * [tlv] Vendor OUI HT capabilities (optional)
3090 * [tlv] Vendor OUI HT information (optional)
3091 * XXX Vendor-specific OIDs (e.g. Atheros)
3092 * [tlv] WPA parameters
3093 * [tlv] WME parameters
3094 * [tlv] TDMA parameters (optional)
3095 * [tlv] Mesh ID (MBSS)
3096 * [tlv] Mesh Conf (MBSS)
3097 * [tlv] application data (optional)
3098 * NB: we allocate the max space required for the TIM bitmap.
3099 * XXX how big is this?
3100 */
3101 pktlen = 8 /* time stamp */
3102 + sizeof(uint16_t) /* beacon interval */
3103 + sizeof(uint16_t) /* capabilities */
3104 + 2 + ni->ni_esslen /* ssid */
3105 + 2 + IEEE80211_RATE_SIZE /* supported rates */
3106 + 2 + 1 /* DS parameters */
3107 + 2 + 6 /* CF parameters */
3108 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */
3109 + IEEE80211_COUNTRY_MAX_SIZE /* country */
3110 + 2 + 1 /* power control */
3111 + sizeof(struct ieee80211_csa_ie) /* CSA */
3112 + sizeof(struct ieee80211_quiet_ie) /* Quiet */
3113 + 2 + 1 /* ERP */
3114 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
3115 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
3116 2*sizeof(struct ieee80211_ie_wpa) : 0)
3117 /* XXX conditional? */
3118 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
3119 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
3120 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */
3121 sizeof(struct ieee80211_wme_param) : 0)
3122 #ifdef IEEE80211_SUPPORT_SUPERG
3123 + sizeof(struct ieee80211_ath_ie) /* ATH */
3124 #endif
3125 #ifdef IEEE80211_SUPPORT_TDMA
3126 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */
3127 sizeof(struct ieee80211_tdma_param) : 0)
3128 #endif
3129 #ifdef IEEE80211_SUPPORT_MESH
3130 + 2 + ni->ni_meshidlen
3131 + sizeof(struct ieee80211_meshconf_ie)
3132 #endif
3133 + IEEE80211_MAX_APPIE
3134 ;
3135 m = ieee80211_getmgtframe(&frm,
3136 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
3137 if (m == NULL) {
3138 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
3139 "%s: cannot get buf; size %u\n", __func__, pktlen);
3140 vap->iv_stats.is_tx_nobuf++;
3141 return NULL;
3142 }
3143 ieee80211_beacon_construct(m, frm, ni);
3144
3145 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
3146 KASSERT(m != NULL, ("no space for 802.11 header?"));
3147 wh = mtod(m, struct ieee80211_frame *);
3148 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
3149 IEEE80211_FC0_SUBTYPE_BEACON;
3150 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
3151 *(uint16_t *)wh->i_dur = 0;
3152 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
3153 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
3154 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
3155 *(uint16_t *)wh->i_seq = 0;
3156
3157 return m;
3158 }
3159
3160 /*
3161 * Update the dynamic parts of a beacon frame based on the current state.
3162 */
3163 int
ieee80211_beacon_update(struct ieee80211_node * ni,struct mbuf * m,int mcast)3164 ieee80211_beacon_update(struct ieee80211_node *ni, struct mbuf *m, int mcast)
3165 {
3166 struct ieee80211vap *vap = ni->ni_vap;
3167 struct ieee80211_beacon_offsets *bo = &vap->iv_bcn_off;
3168 struct ieee80211com *ic = ni->ni_ic;
3169 int len_changed = 0;
3170 uint16_t capinfo;
3171 struct ieee80211_frame *wh;
3172 ieee80211_seq seqno;
3173
3174 IEEE80211_LOCK(ic);
3175 /*
3176 * Handle 11h channel change when we've reached the count.
3177 * We must recalculate the beacon frame contents to account
3178 * for the new channel. Note we do this only for the first
3179 * vap that reaches this point; subsequent vaps just update
3180 * their beacon state to reflect the recalculated channel.
3181 */
3182 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
3183 vap->iv_csa_count == ic->ic_csa_count) {
3184 vap->iv_csa_count = 0;
3185 /*
3186 * Effect channel change before reconstructing the beacon
3187 * frame contents as many places reference ni_chan.
3188 */
3189 if (ic->ic_csa_newchan != NULL)
3190 ieee80211_csa_completeswitch(ic);
3191 /*
3192 * NB: ieee80211_beacon_construct clears all pending
3193 * updates in bo_flags so we don't need to explicitly
3194 * clear IEEE80211_BEACON_CSA.
3195 */
3196 ieee80211_beacon_construct(m,
3197 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), ni);
3198
3199 /* XXX do WME aggressive mode processing? */
3200 IEEE80211_UNLOCK(ic);
3201 return 1; /* just assume length changed */
3202 }
3203
3204 wh = mtod(m, struct ieee80211_frame *);
3205 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
3206 *(uint16_t *)&wh->i_seq[0] =
3207 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
3208 M_SEQNO_SET(m, seqno);
3209
3210 /* XXX faster to recalculate entirely or just changes? */
3211 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
3212 *bo->bo_caps = htole16(capinfo);
3213
3214 if (vap->iv_flags & IEEE80211_F_WME) {
3215 struct ieee80211_wme_state *wme = &ic->ic_wme;
3216
3217 /*
3218 * Check for aggressive mode change. When there is
3219 * significant high priority traffic in the BSS
3220 * throttle back BE traffic by using conservative
3221 * parameters. Otherwise BE uses aggressive params
3222 * to optimize performance of legacy/non-QoS traffic.
3223 */
3224 if (wme->wme_flags & WME_F_AGGRMODE) {
3225 if (wme->wme_hipri_traffic >
3226 wme->wme_hipri_switch_thresh) {
3227 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
3228 "%s: traffic %u, disable aggressive mode\n",
3229 __func__, wme->wme_hipri_traffic);
3230 wme->wme_flags &= ~WME_F_AGGRMODE;
3231 ieee80211_wme_updateparams_locked(vap);
3232 wme->wme_hipri_traffic =
3233 wme->wme_hipri_switch_hysteresis;
3234 } else
3235 wme->wme_hipri_traffic = 0;
3236 } else {
3237 if (wme->wme_hipri_traffic <=
3238 wme->wme_hipri_switch_thresh) {
3239 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
3240 "%s: traffic %u, enable aggressive mode\n",
3241 __func__, wme->wme_hipri_traffic);
3242 wme->wme_flags |= WME_F_AGGRMODE;
3243 ieee80211_wme_updateparams_locked(vap);
3244 wme->wme_hipri_traffic = 0;
3245 } else
3246 wme->wme_hipri_traffic =
3247 wme->wme_hipri_switch_hysteresis;
3248 }
3249 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
3250 (void) ieee80211_add_wme_param(bo->bo_wme, wme);
3251 clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
3252 }
3253 }
3254
3255 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) {
3256 ieee80211_ht_update_beacon(vap, bo);
3257 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
3258 }
3259 #ifdef IEEE80211_SUPPORT_TDMA
3260 if (vap->iv_caps & IEEE80211_C_TDMA) {
3261 /*
3262 * NB: the beacon is potentially updated every TBTT.
3263 */
3264 ieee80211_tdma_update_beacon(vap, bo);
3265 }
3266 #endif
3267 #ifdef IEEE80211_SUPPORT_MESH
3268 if (vap->iv_opmode == IEEE80211_M_MBSS)
3269 ieee80211_mesh_update_beacon(vap, bo);
3270 #endif
3271
3272 if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
3273 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/
3274 struct ieee80211_tim_ie *tie =
3275 (struct ieee80211_tim_ie *) bo->bo_tim;
3276 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
3277 u_int timlen, timoff, i;
3278 /*
3279 * ATIM/DTIM needs updating. If it fits in the
3280 * current space allocated then just copy in the
3281 * new bits. Otherwise we need to move any trailing
3282 * data to make room. Note that we know there is
3283 * contiguous space because ieee80211_beacon_allocate
3284 * insures there is space in the mbuf to write a
3285 * maximal-size virtual bitmap (based on iv_max_aid).
3286 */
3287 /*
3288 * Calculate the bitmap size and offset, copy any
3289 * trailer out of the way, and then copy in the
3290 * new bitmap and update the information element.
3291 * Note that the tim bitmap must contain at least
3292 * one byte and any offset must be even.
3293 */
3294 if (vap->iv_ps_pending != 0) {
3295 timoff = 128; /* impossibly large */
3296 for (i = 0; i < vap->iv_tim_len; i++)
3297 if (vap->iv_tim_bitmap[i]) {
3298 timoff = i &~ 1;
3299 break;
3300 }
3301 KASSERT(timoff != 128, ("tim bitmap empty!"));
3302 for (i = vap->iv_tim_len-1; i >= timoff; i--)
3303 if (vap->iv_tim_bitmap[i])
3304 break;
3305 timlen = 1 + (i - timoff);
3306 } else {
3307 timoff = 0;
3308 timlen = 1;
3309 }
3310 if (timlen != bo->bo_tim_len) {
3311 /* copy up/down trailer */
3312 int adjust = tie->tim_bitmap+timlen
3313 - bo->bo_tim_trailer;
3314 ovbcopy(bo->bo_tim_trailer,
3315 bo->bo_tim_trailer+adjust,
3316 bo->bo_tim_trailer_len);
3317 bo->bo_tim_trailer += adjust;
3318 bo->bo_erp += adjust;
3319 bo->bo_htinfo += adjust;
3320 #ifdef IEEE80211_SUPPORT_SUPERG
3321 bo->bo_ath += adjust;
3322 #endif
3323 #ifdef IEEE80211_SUPPORT_TDMA
3324 bo->bo_tdma += adjust;
3325 #endif
3326 #ifdef IEEE80211_SUPPORT_MESH
3327 bo->bo_meshconf += adjust;
3328 #endif
3329 bo->bo_appie += adjust;
3330 bo->bo_wme += adjust;
3331 bo->bo_csa += adjust;
3332 bo->bo_quiet += adjust;
3333 bo->bo_tim_len = timlen;
3334
3335 /* update information element */
3336 tie->tim_len = 3 + timlen;
3337 tie->tim_bitctl = timoff;
3338 len_changed = 1;
3339 }
3340 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
3341 bo->bo_tim_len);
3342
3343 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
3344
3345 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
3346 "%s: TIM updated, pending %u, off %u, len %u\n",
3347 __func__, vap->iv_ps_pending, timoff, timlen);
3348 }
3349 /* count down DTIM period */
3350 if (tie->tim_count == 0)
3351 tie->tim_count = tie->tim_period - 1;
3352 else
3353 tie->tim_count--;
3354 /* update state for buffered multicast frames on DTIM */
3355 if (mcast && tie->tim_count == 0)
3356 tie->tim_bitctl |= 1;
3357 else
3358 tie->tim_bitctl &= ~1;
3359 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
3360 struct ieee80211_csa_ie *csa =
3361 (struct ieee80211_csa_ie *) bo->bo_csa;
3362
3363 /*
3364 * Insert or update CSA ie. If we're just starting
3365 * to count down to the channel switch then we need
3366 * to insert the CSA ie. Otherwise we just need to
3367 * drop the count. The actual change happens above
3368 * when the vap's count reaches the target count.
3369 */
3370 if (vap->iv_csa_count == 0) {
3371 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
3372 bo->bo_erp += sizeof(*csa);
3373 bo->bo_htinfo += sizeof(*csa);
3374 bo->bo_wme += sizeof(*csa);
3375 #ifdef IEEE80211_SUPPORT_SUPERG
3376 bo->bo_ath += sizeof(*csa);
3377 #endif
3378 #ifdef IEEE80211_SUPPORT_TDMA
3379 bo->bo_tdma += sizeof(*csa);
3380 #endif
3381 #ifdef IEEE80211_SUPPORT_MESH
3382 bo->bo_meshconf += sizeof(*csa);
3383 #endif
3384 bo->bo_appie += sizeof(*csa);
3385 bo->bo_csa_trailer_len += sizeof(*csa);
3386 bo->bo_quiet += sizeof(*csa);
3387 bo->bo_tim_trailer_len += sizeof(*csa);
3388 m->m_len += sizeof(*csa);
3389 m->m_pkthdr.len += sizeof(*csa);
3390
3391 ieee80211_add_csa(bo->bo_csa, vap);
3392 } else
3393 csa->csa_count--;
3394 vap->iv_csa_count++;
3395 /* NB: don't clear IEEE80211_BEACON_CSA */
3396 }
3397 if (IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
3398 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) ){
3399 if (vap->iv_quiet)
3400 ieee80211_add_quiet(bo->bo_quiet, vap);
3401 }
3402 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
3403 /*
3404 * ERP element needs updating.
3405 */
3406 (void) ieee80211_add_erp(bo->bo_erp, ic);
3407 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
3408 }
3409 #ifdef IEEE80211_SUPPORT_SUPERG
3410 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) {
3411 ieee80211_add_athcaps(bo->bo_ath, ni);
3412 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
3413 }
3414 #endif
3415 }
3416 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
3417 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
3418 int aielen;
3419 uint8_t *frm;
3420
3421 aielen = 0;
3422 if (aie != NULL)
3423 aielen += aie->ie_len;
3424 if (aielen != bo->bo_appie_len) {
3425 /* copy up/down trailer */
3426 int adjust = aielen - bo->bo_appie_len;
3427 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
3428 bo->bo_tim_trailer_len);
3429 bo->bo_tim_trailer += adjust;
3430 bo->bo_appie += adjust;
3431 bo->bo_appie_len = aielen;
3432
3433 len_changed = 1;
3434 }
3435 frm = bo->bo_appie;
3436 if (aie != NULL)
3437 frm = add_appie(frm, aie);
3438 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
3439 }
3440 IEEE80211_UNLOCK(ic);
3441
3442 return len_changed;
3443 }
3444
3445 /*
3446 * Do Ethernet-LLC encapsulation for each payload in a fast frame
3447 * tunnel encapsulation. The frame is assumed to have an Ethernet
3448 * header at the front that must be stripped before prepending the
3449 * LLC followed by the Ethernet header passed in (with an Ethernet
3450 * type that specifies the payload size).
3451 */
3452 struct mbuf *
ieee80211_ff_encap1(struct ieee80211vap * vap,struct mbuf * m,const struct ether_header * eh)3453 ieee80211_ff_encap1(struct ieee80211vap *vap, struct mbuf *m,
3454 const struct ether_header *eh)
3455 {
3456 struct llc *llc;
3457 uint16_t payload;
3458
3459 /* XXX optimize by combining m_adj+M_PREPEND */
3460 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
3461 llc = mtod(m, struct llc *);
3462 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
3463 llc->llc_control = LLC_UI;
3464 llc->llc_snap.org_code[0] = 0;
3465 llc->llc_snap.org_code[1] = 0;
3466 llc->llc_snap.org_code[2] = 0;
3467 llc->llc_snap.ether_type = eh->ether_type;
3468 payload = m->m_pkthdr.len; /* NB: w/o Ethernet header */
3469
3470 M_PREPEND(m, sizeof(struct ether_header), M_NOWAIT);
3471 if (m == NULL) { /* XXX cannot happen */
3472 IEEE80211_DPRINTF(vap, IEEE80211_MSG_SUPERG,
3473 "%s: no space for ether_header\n", __func__);
3474 vap->iv_stats.is_tx_nobuf++;
3475 return NULL;
3476 }
3477 ETHER_HEADER_COPY(mtod(m, void *), eh);
3478 mtod(m, struct ether_header *)->ether_type = htons(payload);
3479 return m;
3480 }
3481
3482 /*
3483 * Complete an mbuf transmission.
3484 *
3485 * For now, this simply processes a completed frame after the
3486 * driver has completed it's transmission and/or retransmission.
3487 * It assumes the frame is an 802.11 encapsulated frame.
3488 *
3489 * Later on it will grow to become the exit path for a given frame
3490 * from the driver and, depending upon how it's been encapsulated
3491 * and already transmitted, it may end up doing A-MPDU retransmission,
3492 * power save requeuing, etc.
3493 *
3494 * In order for the above to work, the driver entry point to this
3495 * must not hold any driver locks. Thus, the driver needs to delay
3496 * any actual mbuf completion until it can release said locks.
3497 *
3498 * This frees the mbuf and if the mbuf has a node reference,
3499 * the node reference will be freed.
3500 */
3501 void
ieee80211_tx_complete(struct ieee80211_node * ni,struct mbuf * m,int status)3502 ieee80211_tx_complete(struct ieee80211_node *ni, struct mbuf *m, int status)
3503 {
3504
3505 if (ni != NULL) {
3506 struct ifnet *ifp = ni->ni_vap->iv_ifp;
3507
3508 if (status == 0) {
3509 if_inc_counter(ifp, IFCOUNTER_OBYTES, m->m_pkthdr.len);
3510 if_inc_counter(ifp, IFCOUNTER_OPACKETS, 1);
3511 if (m->m_flags & M_MCAST)
3512 if_inc_counter(ifp, IFCOUNTER_OMCASTS, 1);
3513 } else
3514 if_inc_counter(ifp, IFCOUNTER_OERRORS, 1);
3515 if (m->m_flags & M_TXCB)
3516 ieee80211_process_callback(ni, m, status);
3517 ieee80211_free_node(ni);
3518 }
3519 m_freem(m);
3520 }
3521