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/mbuf.h>
37 #include <sys/kernel.h>
38 #include <sys/endian.h>
39
40 #include <sys/socket.h>
41
42 #include <net/bpf.h>
43 #include <net/ethernet.h>
44 #include <net/if.h>
45 #include <net/if_llc.h>
46 #include <net/if_media.h>
47 #include <net/if_vlan_var.h>
48
49 #include <net80211/ieee80211_var.h>
50 #include <net80211/ieee80211_regdomain.h>
51 #ifdef IEEE80211_SUPPORT_SUPERG
52 #include <net80211/ieee80211_superg.h>
53 #endif
54 #ifdef IEEE80211_SUPPORT_TDMA
55 #include <net80211/ieee80211_tdma.h>
56 #endif
57 #include <net80211/ieee80211_wds.h>
58 #include <net80211/ieee80211_mesh.h>
59
60 #if defined(INET) || defined(INET6)
61 #include <netinet/in.h>
62 #endif
63
64 #ifdef INET
65 #include <netinet/if_ether.h>
66 #include <netinet/in_systm.h>
67 #include <netinet/ip.h>
68 #endif
69 #ifdef INET6
70 #include <netinet/ip6.h>
71 #endif
72
73 #include <security/mac/mac_framework.h>
74
75 #define ETHER_HEADER_COPY(dst, src) \
76 memcpy(dst, src, sizeof(struct ether_header))
77
78 /* unalligned little endian access */
79 #define LE_WRITE_2(p, v) do { \
80 ((uint8_t *)(p))[0] = (v) & 0xff; \
81 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \
82 } while (0)
83 #define LE_WRITE_4(p, v) do { \
84 ((uint8_t *)(p))[0] = (v) & 0xff; \
85 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \
86 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \
87 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \
88 } while (0)
89
90 static int ieee80211_fragment(struct ieee80211vap *, struct mbuf *,
91 u_int hdrsize, u_int ciphdrsize, u_int mtu);
92 static void ieee80211_tx_mgt_cb(struct ieee80211_node *, void *, int);
93
94 #ifdef IEEE80211_DEBUG
95 /*
96 * Decide if an outbound management frame should be
97 * printed when debugging is enabled. This filters some
98 * of the less interesting frames that come frequently
99 * (e.g. beacons).
100 */
101 static __inline int
102 doprint(struct ieee80211vap *vap, int subtype)
103 {
104 switch (subtype) {
105 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
106 return (vap->iv_opmode == IEEE80211_M_IBSS);
107 }
108 return 1;
109 }
110 #endif
111
112 /*
113 * Start method for vap's. All packets from the stack come
114 * through here. We handle common processing of the packets
115 * before dispatching them to the underlying device.
116 */
117 void
118 ieee80211_start(struct ifnet *ifp)
119 {
120 #define IS_DWDS(vap) \
121 (vap->iv_opmode == IEEE80211_M_WDS && \
122 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) == 0)
123 struct ieee80211vap *vap = ifp->if_softc;
124 struct ieee80211com *ic = vap->iv_ic;
125 struct ifnet *parent = ic->ic_ifp;
126 struct ieee80211_node *ni;
127 struct mbuf *m;
128 struct ether_header *eh;
129 int error;
130
131 /* NB: parent must be up and running */
132 if (!IFNET_IS_UP_RUNNING(parent)) {
133 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
134 "%s: ignore queue, parent %s not up+running\n",
135 __func__, parent->if_xname);
136 /* XXX stat */
137 return;
138 }
139 if (vap->iv_state == IEEE80211_S_SLEEP) {
140 /*
141 * In power save, wakeup device for transmit.
142 */
143 ieee80211_new_state(vap, IEEE80211_S_RUN, 0);
144 return;
145 }
146 /*
147 * No data frames go out unless we're running.
148 * Note in particular this covers CAC and CSA
149 * states (though maybe we should check muting
150 * for CSA).
151 */
152 if (vap->iv_state != IEEE80211_S_RUN) {
153 IEEE80211_LOCK(ic);
154 /* re-check under the com lock to avoid races */
155 if (vap->iv_state != IEEE80211_S_RUN) {
156 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
157 "%s: ignore queue, in %s state\n",
158 __func__, ieee80211_state_name[vap->iv_state]);
159 vap->iv_stats.is_tx_badstate++;
160 ifp->if_drv_flags |= IFF_DRV_OACTIVE;
161 IEEE80211_UNLOCK(ic);
162 return;
163 }
164 IEEE80211_UNLOCK(ic);
165 }
166 for (;;) {
167 IFQ_DEQUEUE(&ifp->if_snd, m);
168 if (m == NULL)
169 break;
170 /*
171 * Sanitize mbuf flags for net80211 use. We cannot
172 * clear M_PWR_SAV or M_MORE_DATA because these may
173 * be set for frames that are re-submitted from the
174 * power save queue.
175 *
176 * NB: This must be done before ieee80211_classify as
177 * it marks EAPOL in frames with M_EAPOL.
178 */
179 m->m_flags &= ~(M_80211_TX - M_PWR_SAV - M_MORE_DATA);
180 /*
181 * Cancel any background scan.
182 */
183 if (ic->ic_flags & IEEE80211_F_SCAN)
184 ieee80211_cancel_anyscan(vap);
185 /*
186 * Find the node for the destination so we can do
187 * things like power save and fast frames aggregation.
188 *
189 * NB: past this point various code assumes the first
190 * mbuf has the 802.3 header present (and contiguous).
191 */
192 ni = NULL;
193 if (m->m_len < sizeof(struct ether_header) &&
194 (m = m_pullup(m, sizeof(struct ether_header))) == NULL) {
195 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
196 "discard frame, %s\n", "m_pullup failed");
197 vap->iv_stats.is_tx_nobuf++; /* XXX */
198 ifp->if_oerrors++;
199 continue;
200 }
201 eh = mtod(m, struct ether_header *);
202 if (ETHER_IS_MULTICAST(eh->ether_dhost)) {
203 if (IS_DWDS(vap)) {
204 /*
205 * Only unicast frames from the above go out
206 * DWDS vaps; multicast frames are handled by
207 * dispatching the frame as it comes through
208 * the AP vap (see below).
209 */
210 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_WDS,
211 eh->ether_dhost, "mcast", "%s", "on DWDS");
212 vap->iv_stats.is_dwds_mcast++;
213 m_freem(m);
214 continue;
215 }
216 if (vap->iv_opmode == IEEE80211_M_HOSTAP) {
217 /*
218 * Spam DWDS vap's w/ multicast traffic.
219 */
220 /* XXX only if dwds in use? */
221 ieee80211_dwds_mcast(vap, m);
222 }
223 }
224 #ifdef IEEE80211_SUPPORT_MESH
225 if (vap->iv_opmode != IEEE80211_M_MBSS) {
226 #endif
227 ni = ieee80211_find_txnode(vap, eh->ether_dhost);
228 if (ni == NULL) {
229 /* NB: ieee80211_find_txnode does stat+msg */
230 ifp->if_oerrors++;
231 m_freem(m);
232 continue;
233 }
234 if (ni->ni_associd == 0 &&
235 (ni->ni_flags & IEEE80211_NODE_ASSOCID)) {
236 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
237 eh->ether_dhost, NULL,
238 "sta not associated (type 0x%04x)",
239 htons(eh->ether_type));
240 vap->iv_stats.is_tx_notassoc++;
241 ifp->if_oerrors++;
242 m_freem(m);
243 ieee80211_free_node(ni);
244 continue;
245 }
246 #ifdef IEEE80211_SUPPORT_MESH
247 } else {
248 if (!IEEE80211_ADDR_EQ(eh->ether_shost, vap->iv_myaddr)) {
249 /*
250 * Proxy station only if configured.
251 */
252 if (!ieee80211_mesh_isproxyena(vap)) {
253 IEEE80211_DISCARD_MAC(vap,
254 IEEE80211_MSG_OUTPUT |
255 IEEE80211_MSG_MESH,
256 eh->ether_dhost, NULL,
257 "%s", "proxy not enabled");
258 vap->iv_stats.is_mesh_notproxy++;
259 ifp->if_oerrors++;
260 m_freem(m);
261 continue;
262 }
263 ieee80211_mesh_proxy_check(vap, eh->ether_shost);
264 }
265 ni = ieee80211_mesh_discover(vap, eh->ether_dhost, m);
266 if (ni == NULL) {
267 /*
268 * NB: ieee80211_mesh_discover holds/disposes
269 * frame (e.g. queueing on path discovery).
270 */
271 ifp->if_oerrors++;
272 continue;
273 }
274 }
275 #endif
276 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
277 (m->m_flags & M_PWR_SAV) == 0) {
278 /*
279 * Station in power save mode; pass the frame
280 * to the 802.11 layer and continue. We'll get
281 * the frame back when the time is right.
282 * XXX lose WDS vap linkage?
283 */
284 (void) ieee80211_pwrsave(ni, m);
285 ieee80211_free_node(ni);
286 continue;
287 }
288 /* calculate priority so drivers can find the tx queue */
289 if (ieee80211_classify(ni, m)) {
290 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_OUTPUT,
291 eh->ether_dhost, NULL,
292 "%s", "classification failure");
293 vap->iv_stats.is_tx_classify++;
294 ifp->if_oerrors++;
295 m_freem(m);
296 ieee80211_free_node(ni);
297 continue;
298 }
299 /*
300 * Stash the node pointer. Note that we do this after
301 * any call to ieee80211_dwds_mcast because that code
302 * uses any existing value for rcvif to identify the
303 * interface it (might have been) received on.
304 */
305 m->m_pkthdr.rcvif = (void *)ni;
306
307 BPF_MTAP(ifp, m); /* 802.3 tx */
308
309 /*
310 * Check if A-MPDU tx aggregation is setup or if we
311 * should try to enable it. The sta must be associated
312 * with HT and A-MPDU enabled for use. When the policy
313 * routine decides we should enable A-MPDU we issue an
314 * ADDBA request and wait for a reply. The frame being
315 * encapsulated will go out w/o using A-MPDU, or possibly
316 * it might be collected by the driver and held/retransmit.
317 * The default ic_ampdu_enable routine handles staggering
318 * ADDBA requests in case the receiver NAK's us or we are
319 * otherwise unable to establish a BA stream.
320 */
321 if ((ni->ni_flags & IEEE80211_NODE_AMPDU_TX) &&
322 (vap->iv_flags_ht & IEEE80211_FHT_AMPDU_TX) &&
323 (m->m_flags & M_EAPOL) == 0) {
324 const int ac = M_WME_GETAC(m);
325 struct ieee80211_tx_ampdu *tap = &ni->ni_tx_ampdu[ac];
326
327 ieee80211_txampdu_count_packet(tap);
328 if (IEEE80211_AMPDU_RUNNING(tap)) {
329 /*
330 * Operational, mark frame for aggregation.
331 *
332 * XXX do tx aggregation here
333 */
334 m->m_flags |= M_AMPDU_MPDU;
335 } else if (!IEEE80211_AMPDU_REQUESTED(tap) &&
336 ic->ic_ampdu_enable(ni, tap)) {
337 /*
338 * Not negotiated yet, request service.
339 */
340 ieee80211_ampdu_request(ni, tap);
341 /* XXX hold frame for reply? */
342 }
343 }
344 #ifdef IEEE80211_SUPPORT_SUPERG
345 else if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_NODE_FF)) {
346 m = ieee80211_ff_check(ni, m);
347 if (m == NULL) {
348 /* NB: any ni ref held on stageq */
349 continue;
350 }
351 }
352 #endif /* IEEE80211_SUPPORT_SUPERG */
353 if (__predict_true((vap->iv_caps & IEEE80211_C_8023ENCAP) == 0)) {
354 /*
355 * Encapsulate the packet in prep for transmission.
356 */
357 m = ieee80211_encap(vap, ni, m);
358 if (m == NULL) {
359 /* NB: stat+msg handled in ieee80211_encap */
360 ieee80211_free_node(ni);
361 continue;
362 }
363 }
364
365 error = parent->if_transmit(parent, m);
366 if (error != 0) {
367 /* NB: IFQ_HANDOFF reclaims mbuf */
368 ieee80211_free_node(ni);
369 } else {
370 ifp->if_opackets++;
371 }
372 ic->ic_lastdata = ticks;
373 }
374 #undef IS_DWDS
375 }
376
377 /*
378 * 802.11 output routine. This is (currently) used only to
379 * connect bpf write calls to the 802.11 layer for injecting
380 * raw 802.11 frames.
381 */
382 int
383 ieee80211_output(struct ifnet *ifp, struct mbuf *m,
384 struct sockaddr *dst, struct route *ro)
385 {
386 #define senderr(e) do { error = (e); goto bad;} while (0)
387 struct ieee80211_node *ni = NULL;
388 struct ieee80211vap *vap;
389 struct ieee80211_frame *wh;
390 int error;
391
392 if (ifp->if_drv_flags & IFF_DRV_OACTIVE) {
393 /*
394 * Short-circuit requests if the vap is marked OACTIVE
395 * as this can happen because a packet came down through
396 * ieee80211_start before the vap entered RUN state in
397 * which case it's ok to just drop the frame. This
398 * should not be necessary but callers of if_output don't
399 * check OACTIVE.
400 */
401 senderr(ENETDOWN);
402 }
403 vap = ifp->if_softc;
404 /*
405 * Hand to the 802.3 code if not tagged as
406 * a raw 802.11 frame.
407 */
408 if (dst->sa_family != AF_IEEE80211)
409 return vap->iv_output(ifp, m, dst, ro);
410 #ifdef MAC
411 error = mac_ifnet_check_transmit(ifp, m);
412 if (error)
413 senderr(error);
414 #endif
415 if (ifp->if_flags & IFF_MONITOR)
416 senderr(ENETDOWN);
417 if (!IFNET_IS_UP_RUNNING(ifp))
418 senderr(ENETDOWN);
419 if (vap->iv_state == IEEE80211_S_CAC) {
420 IEEE80211_DPRINTF(vap,
421 IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
422 "block %s frame in CAC state\n", "raw data");
423 vap->iv_stats.is_tx_badstate++;
424 senderr(EIO); /* XXX */
425 } else if (vap->iv_state == IEEE80211_S_SCAN)
426 senderr(EIO);
427 /* XXX bypass bridge, pfil, carp, etc. */
428
429 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame_ack))
430 senderr(EIO); /* XXX */
431 wh = mtod(m, struct ieee80211_frame *);
432 if ((wh->i_fc[0] & IEEE80211_FC0_VERSION_MASK) !=
433 IEEE80211_FC0_VERSION_0)
434 senderr(EIO); /* XXX */
435
436 /* locate destination node */
437 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
438 case IEEE80211_FC1_DIR_NODS:
439 case IEEE80211_FC1_DIR_FROMDS:
440 ni = ieee80211_find_txnode(vap, wh->i_addr1);
441 break;
442 case IEEE80211_FC1_DIR_TODS:
443 case IEEE80211_FC1_DIR_DSTODS:
444 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame))
445 senderr(EIO); /* XXX */
446 ni = ieee80211_find_txnode(vap, wh->i_addr3);
447 break;
448 default:
449 senderr(EIO); /* XXX */
450 }
451 if (ni == NULL) {
452 /*
453 * Permit packets w/ bpf params through regardless
454 * (see below about sa_len).
455 */
456 if (dst->sa_len == 0)
457 senderr(EHOSTUNREACH);
458 ni = ieee80211_ref_node(vap->iv_bss);
459 }
460
461 /*
462 * Sanitize mbuf for net80211 flags leaked from above.
463 *
464 * NB: This must be done before ieee80211_classify as
465 * it marks EAPOL in frames with M_EAPOL.
466 */
467 m->m_flags &= ~M_80211_TX;
468
469 /* calculate priority so drivers can find the tx queue */
470 /* XXX assumes an 802.3 frame */
471 if (ieee80211_classify(ni, m))
472 senderr(EIO); /* XXX */
473
474 ifp->if_opackets++;
475 IEEE80211_NODE_STAT(ni, tx_data);
476 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
477 IEEE80211_NODE_STAT(ni, tx_mcast);
478 m->m_flags |= M_MCAST;
479 } else
480 IEEE80211_NODE_STAT(ni, tx_ucast);
481 /* NB: ieee80211_encap does not include 802.11 header */
482 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, m->m_pkthdr.len);
483
484 /*
485 * NB: DLT_IEEE802_11_RADIO identifies the parameters are
486 * present by setting the sa_len field of the sockaddr (yes,
487 * this is a hack).
488 * NB: we assume sa_data is suitably aligned to cast.
489 */
490 return vap->iv_ic->ic_raw_xmit(ni, m,
491 (const struct ieee80211_bpf_params *)(dst->sa_len ?
492 dst->sa_data : NULL));
493 bad:
494 if (m != NULL)
495 m_freem(m);
496 if (ni != NULL)
497 ieee80211_free_node(ni);
498 ifp->if_oerrors++;
499 return error;
500 #undef senderr
501 }
502
503 /*
504 * Set the direction field and address fields of an outgoing
505 * frame. Note this should be called early on in constructing
506 * a frame as it sets i_fc[1]; other bits can then be or'd in.
507 */
508 void
509 ieee80211_send_setup(
510 struct ieee80211_node *ni,
511 struct mbuf *m,
512 int type, int tid,
513 const uint8_t sa[IEEE80211_ADDR_LEN],
514 const uint8_t da[IEEE80211_ADDR_LEN],
515 const uint8_t bssid[IEEE80211_ADDR_LEN])
516 {
517 #define WH4(wh) ((struct ieee80211_frame_addr4 *)wh)
518 struct ieee80211vap *vap = ni->ni_vap;
519 struct ieee80211_tx_ampdu *tap;
520 struct ieee80211_frame *wh = mtod(m, struct ieee80211_frame *);
521 ieee80211_seq seqno;
522
523 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | type;
524 if ((type & IEEE80211_FC0_TYPE_MASK) == IEEE80211_FC0_TYPE_DATA) {
525 switch (vap->iv_opmode) {
526 case IEEE80211_M_STA:
527 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
528 IEEE80211_ADDR_COPY(wh->i_addr1, bssid);
529 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
530 IEEE80211_ADDR_COPY(wh->i_addr3, da);
531 break;
532 case IEEE80211_M_IBSS:
533 case IEEE80211_M_AHDEMO:
534 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
535 IEEE80211_ADDR_COPY(wh->i_addr1, da);
536 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
537 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
538 break;
539 case IEEE80211_M_HOSTAP:
540 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
541 IEEE80211_ADDR_COPY(wh->i_addr1, da);
542 IEEE80211_ADDR_COPY(wh->i_addr2, bssid);
543 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
544 break;
545 case IEEE80211_M_WDS:
546 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
547 IEEE80211_ADDR_COPY(wh->i_addr1, da);
548 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
549 IEEE80211_ADDR_COPY(wh->i_addr3, da);
550 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
551 break;
552 case IEEE80211_M_MBSS:
553 #ifdef IEEE80211_SUPPORT_MESH
554 /* XXX add support for proxied addresses */
555 if (IEEE80211_IS_MULTICAST(da)) {
556 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
557 /* XXX next hop */
558 IEEE80211_ADDR_COPY(wh->i_addr1, da);
559 IEEE80211_ADDR_COPY(wh->i_addr2,
560 vap->iv_myaddr);
561 } else {
562 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
563 IEEE80211_ADDR_COPY(wh->i_addr1, da);
564 IEEE80211_ADDR_COPY(wh->i_addr2,
565 vap->iv_myaddr);
566 IEEE80211_ADDR_COPY(wh->i_addr3, da);
567 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, sa);
568 }
569 #endif
570 break;
571 case IEEE80211_M_MONITOR: /* NB: to quiet compiler */
572 break;
573 }
574 } else {
575 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
576 IEEE80211_ADDR_COPY(wh->i_addr1, da);
577 IEEE80211_ADDR_COPY(wh->i_addr2, sa);
578 #ifdef IEEE80211_SUPPORT_MESH
579 if (vap->iv_opmode == IEEE80211_M_MBSS)
580 IEEE80211_ADDR_COPY(wh->i_addr3, sa);
581 else
582 #endif
583 IEEE80211_ADDR_COPY(wh->i_addr3, bssid);
584 }
585 *(uint16_t *)&wh->i_dur[0] = 0;
586
587 tap = &ni->ni_tx_ampdu[TID_TO_WME_AC(tid)];
588 if (tid != IEEE80211_NONQOS_TID && IEEE80211_AMPDU_RUNNING(tap))
589 m->m_flags |= M_AMPDU_MPDU;
590 else {
591 seqno = ni->ni_txseqs[tid]++;
592 *(uint16_t *)&wh->i_seq[0] =
593 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
594 M_SEQNO_SET(m, seqno);
595 }
596
597 if (IEEE80211_IS_MULTICAST(wh->i_addr1))
598 m->m_flags |= M_MCAST;
599 #undef WH4
600 }
601
602 /*
603 * Send a management frame to the specified node. The node pointer
604 * must have a reference as the pointer will be passed to the driver
605 * and potentially held for a long time. If the frame is successfully
606 * dispatched to the driver, then it is responsible for freeing the
607 * reference (and potentially free'ing up any associated storage);
608 * otherwise deal with reclaiming any reference (on error).
609 */
610 int
611 ieee80211_mgmt_output(struct ieee80211_node *ni, struct mbuf *m, int type,
612 struct ieee80211_bpf_params *params)
613 {
614 struct ieee80211vap *vap = ni->ni_vap;
615 struct ieee80211com *ic = ni->ni_ic;
616 struct ieee80211_frame *wh;
617
618 KASSERT(ni != NULL, ("null node"));
619
620 if (vap->iv_state == IEEE80211_S_CAC) {
621 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
622 ni, "block %s frame in CAC state",
623 ieee80211_mgt_subtype_name[
624 (type & IEEE80211_FC0_SUBTYPE_MASK) >>
625 IEEE80211_FC0_SUBTYPE_SHIFT]);
626 vap->iv_stats.is_tx_badstate++;
627 ieee80211_free_node(ni);
628 m_freem(m);
629 return EIO; /* XXX */
630 }
631
632 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
633 if (m == NULL) {
634 ieee80211_free_node(ni);
635 return ENOMEM;
636 }
637
638 wh = mtod(m, struct ieee80211_frame *);
639 ieee80211_send_setup(ni, m,
640 IEEE80211_FC0_TYPE_MGT | type, IEEE80211_NONQOS_TID,
641 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
642 if (params->ibp_flags & IEEE80211_BPF_CRYPTO) {
643 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_AUTH, wh->i_addr1,
644 "encrypting frame (%s)", __func__);
645 wh->i_fc[1] |= IEEE80211_FC1_WEP;
646 }
647 m->m_flags |= M_ENCAP; /* mark encapsulated */
648
649 KASSERT(type != IEEE80211_FC0_SUBTYPE_PROBE_RESP, ("probe response?"));
650 M_WME_SETAC(m, params->ibp_pri);
651
652 #ifdef IEEE80211_DEBUG
653 /* avoid printing too many frames */
654 if ((ieee80211_msg_debug(vap) && doprint(vap, type)) ||
655 ieee80211_msg_dumppkts(vap)) {
656 printf("[%s] send %s on channel %u\n",
657 ether_sprintf(wh->i_addr1),
658 ieee80211_mgt_subtype_name[
659 (type & IEEE80211_FC0_SUBTYPE_MASK) >>
660 IEEE80211_FC0_SUBTYPE_SHIFT],
661 ieee80211_chan2ieee(ic, ic->ic_curchan));
662 }
663 #endif
664 IEEE80211_NODE_STAT(ni, tx_mgmt);
665
666 return ic->ic_raw_xmit(ni, m, params);
667 }
668
669 /*
670 * Send a null data frame to the specified node. If the station
671 * is setup for QoS then a QoS Null Data frame is constructed.
672 * If this is a WDS station then a 4-address frame is constructed.
673 *
674 * NB: the caller is assumed to have setup a node reference
675 * for use; this is necessary to deal with a race condition
676 * when probing for inactive stations. Like ieee80211_mgmt_output
677 * we must cleanup any node reference on error; however we
678 * can safely just unref it as we know it will never be the
679 * last reference to the node.
680 */
681 int
682 ieee80211_send_nulldata(struct ieee80211_node *ni)
683 {
684 struct ieee80211vap *vap = ni->ni_vap;
685 struct ieee80211com *ic = ni->ni_ic;
686 struct mbuf *m;
687 struct ieee80211_frame *wh;
688 int hdrlen;
689 uint8_t *frm;
690
691 if (vap->iv_state == IEEE80211_S_CAC) {
692 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT | IEEE80211_MSG_DOTH,
693 ni, "block %s frame in CAC state", "null data");
694 ieee80211_unref_node(&ni);
695 vap->iv_stats.is_tx_badstate++;
696 return EIO; /* XXX */
697 }
698
699 if (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT))
700 hdrlen = sizeof(struct ieee80211_qosframe);
701 else
702 hdrlen = sizeof(struct ieee80211_frame);
703 /* NB: only WDS vap's get 4-address frames */
704 if (vap->iv_opmode == IEEE80211_M_WDS)
705 hdrlen += IEEE80211_ADDR_LEN;
706 if (ic->ic_flags & IEEE80211_F_DATAPAD)
707 hdrlen = roundup(hdrlen, sizeof(uint32_t));
708
709 m = ieee80211_getmgtframe(&frm, ic->ic_headroom + hdrlen, 0);
710 if (m == NULL) {
711 /* XXX debug msg */
712 ieee80211_unref_node(&ni);
713 vap->iv_stats.is_tx_nobuf++;
714 return ENOMEM;
715 }
716 KASSERT(M_LEADINGSPACE(m) >= hdrlen,
717 ("leading space %zd", M_LEADINGSPACE(m)));
718 M_PREPEND(m, hdrlen, M_DONTWAIT);
719 if (m == NULL) {
720 /* NB: cannot happen */
721 ieee80211_free_node(ni);
722 return ENOMEM;
723 }
724
725 wh = mtod(m, struct ieee80211_frame *); /* NB: a little lie */
726 if (ni->ni_flags & IEEE80211_NODE_QOS) {
727 const int tid = WME_AC_TO_TID(WME_AC_BE);
728 uint8_t *qos;
729
730 ieee80211_send_setup(ni, m,
731 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_QOS_NULL,
732 tid, vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
733
734 if (vap->iv_opmode == IEEE80211_M_WDS)
735 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
736 else
737 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
738 qos[0] = tid & IEEE80211_QOS_TID;
739 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[WME_AC_BE].wmep_noackPolicy)
740 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
741 qos[1] = 0;
742 } else {
743 ieee80211_send_setup(ni, m,
744 IEEE80211_FC0_TYPE_DATA | IEEE80211_FC0_SUBTYPE_NODATA,
745 IEEE80211_NONQOS_TID,
746 vap->iv_myaddr, ni->ni_macaddr, ni->ni_bssid);
747 }
748 if (vap->iv_opmode != IEEE80211_M_WDS) {
749 /* NB: power management bit is never sent by an AP */
750 if ((ni->ni_flags & IEEE80211_NODE_PWR_MGT) &&
751 vap->iv_opmode != IEEE80211_M_HOSTAP)
752 wh->i_fc[1] |= IEEE80211_FC1_PWR_MGT;
753 }
754 m->m_len = m->m_pkthdr.len = hdrlen;
755 m->m_flags |= M_ENCAP; /* mark encapsulated */
756
757 M_WME_SETAC(m, WME_AC_BE);
758
759 IEEE80211_NODE_STAT(ni, tx_data);
760
761 IEEE80211_NOTE(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS, ni,
762 "send %snull data frame on channel %u, pwr mgt %s",
763 ni->ni_flags & IEEE80211_NODE_QOS ? "QoS " : "",
764 ieee80211_chan2ieee(ic, ic->ic_curchan),
765 wh->i_fc[1] & IEEE80211_FC1_PWR_MGT ? "ena" : "dis");
766
767 return ic->ic_raw_xmit(ni, m, NULL);
768 }
769
770 /*
771 * Assign priority to a frame based on any vlan tag assigned
772 * to the station and/or any Diffserv setting in an IP header.
773 * Finally, if an ACM policy is setup (in station mode) it's
774 * applied.
775 */
776 int
777 ieee80211_classify(struct ieee80211_node *ni, struct mbuf *m)
778 {
779 const struct ether_header *eh = mtod(m, struct ether_header *);
780 int v_wme_ac, d_wme_ac, ac;
781
782 /*
783 * Always promote PAE/EAPOL frames to high priority.
784 */
785 if (eh->ether_type == htons(ETHERTYPE_PAE)) {
786 /* NB: mark so others don't need to check header */
787 m->m_flags |= M_EAPOL;
788 ac = WME_AC_VO;
789 goto done;
790 }
791 /*
792 * Non-qos traffic goes to BE.
793 */
794 if ((ni->ni_flags & IEEE80211_NODE_QOS) == 0) {
795 ac = WME_AC_BE;
796 goto done;
797 }
798
799 /*
800 * If node has a vlan tag then all traffic
801 * to it must have a matching tag.
802 */
803 v_wme_ac = 0;
804 if (ni->ni_vlan != 0) {
805 if ((m->m_flags & M_VLANTAG) == 0) {
806 IEEE80211_NODE_STAT(ni, tx_novlantag);
807 return 1;
808 }
809 if (EVL_VLANOFTAG(m->m_pkthdr.ether_vtag) !=
810 EVL_VLANOFTAG(ni->ni_vlan)) {
811 IEEE80211_NODE_STAT(ni, tx_vlanmismatch);
812 return 1;
813 }
814 /* map vlan priority to AC */
815 v_wme_ac = TID_TO_WME_AC(EVL_PRIOFTAG(ni->ni_vlan));
816 }
817
818 /* XXX m_copydata may be too slow for fast path */
819 #ifdef INET
820 if (eh->ether_type == htons(ETHERTYPE_IP)) {
821 uint8_t tos;
822 /*
823 * IP frame, map the DSCP bits from the TOS field.
824 */
825 /* NB: ip header may not be in first mbuf */
826 m_copydata(m, sizeof(struct ether_header) +
827 offsetof(struct ip, ip_tos), sizeof(tos), &tos);
828 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
829 d_wme_ac = TID_TO_WME_AC(tos);
830 } else {
831 #endif /* INET */
832 #ifdef INET6
833 if (eh->ether_type == htons(ETHERTYPE_IPV6)) {
834 uint32_t flow;
835 uint8_t tos;
836 /*
837 * IPv6 frame, map the DSCP bits from the traffic class field.
838 */
839 m_copydata(m, sizeof(struct ether_header) +
840 offsetof(struct ip6_hdr, ip6_flow), sizeof(flow),
841 (caddr_t) &flow);
842 tos = (uint8_t)(ntohl(flow) >> 20);
843 tos >>= 5; /* NB: ECN + low 3 bits of DSCP */
844 d_wme_ac = TID_TO_WME_AC(tos);
845 } else {
846 #endif /* INET6 */
847 d_wme_ac = WME_AC_BE;
848 #ifdef INET6
849 }
850 #endif
851 #ifdef INET
852 }
853 #endif
854 /*
855 * Use highest priority AC.
856 */
857 if (v_wme_ac > d_wme_ac)
858 ac = v_wme_ac;
859 else
860 ac = d_wme_ac;
861
862 /*
863 * Apply ACM policy.
864 */
865 if (ni->ni_vap->iv_opmode == IEEE80211_M_STA) {
866 static const int acmap[4] = {
867 WME_AC_BK, /* WME_AC_BE */
868 WME_AC_BK, /* WME_AC_BK */
869 WME_AC_BE, /* WME_AC_VI */
870 WME_AC_VI, /* WME_AC_VO */
871 };
872 struct ieee80211com *ic = ni->ni_ic;
873
874 while (ac != WME_AC_BK &&
875 ic->ic_wme.wme_wmeBssChanParams.cap_wmeParams[ac].wmep_acm)
876 ac = acmap[ac];
877 }
878 done:
879 M_WME_SETAC(m, ac);
880 return 0;
881 }
882
883 /*
884 * Insure there is sufficient contiguous space to encapsulate the
885 * 802.11 data frame. If room isn't already there, arrange for it.
886 * Drivers and cipher modules assume we have done the necessary work
887 * and fail rudely if they don't find the space they need.
888 */
889 struct mbuf *
890 ieee80211_mbuf_adjust(struct ieee80211vap *vap, int hdrsize,
891 struct ieee80211_key *key, struct mbuf *m)
892 {
893 #define TO_BE_RECLAIMED (sizeof(struct ether_header) - sizeof(struct llc))
894 int needed_space = vap->iv_ic->ic_headroom + hdrsize;
895
896 if (key != NULL) {
897 /* XXX belongs in crypto code? */
898 needed_space += key->wk_cipher->ic_header;
899 /* XXX frags */
900 /*
901 * When crypto is being done in the host we must insure
902 * the data are writable for the cipher routines; clone
903 * a writable mbuf chain.
904 * XXX handle SWMIC specially
905 */
906 if (key->wk_flags & (IEEE80211_KEY_SWENCRYPT|IEEE80211_KEY_SWENMIC)) {
907 m = m_unshare(m, M_NOWAIT);
908 if (m == NULL) {
909 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
910 "%s: cannot get writable mbuf\n", __func__);
911 vap->iv_stats.is_tx_nobuf++; /* XXX new stat */
912 return NULL;
913 }
914 }
915 }
916 /*
917 * We know we are called just before stripping an Ethernet
918 * header and prepending an LLC header. This means we know
919 * there will be
920 * sizeof(struct ether_header) - sizeof(struct llc)
921 * bytes recovered to which we need additional space for the
922 * 802.11 header and any crypto header.
923 */
924 /* XXX check trailing space and copy instead? */
925 if (M_LEADINGSPACE(m) < needed_space - TO_BE_RECLAIMED) {
926 struct mbuf *n = m_gethdr(M_NOWAIT, m->m_type);
927 if (n == NULL) {
928 IEEE80211_DPRINTF(vap, IEEE80211_MSG_OUTPUT,
929 "%s: cannot expand storage\n", __func__);
930 vap->iv_stats.is_tx_nobuf++;
931 m_freem(m);
932 return NULL;
933 }
934 KASSERT(needed_space <= MHLEN,
935 ("not enough room, need %u got %zu\n", needed_space, MHLEN));
936 /*
937 * Setup new mbuf to have leading space to prepend the
938 * 802.11 header and any crypto header bits that are
939 * required (the latter are added when the driver calls
940 * back to ieee80211_crypto_encap to do crypto encapsulation).
941 */
942 /* NB: must be first 'cuz it clobbers m_data */
943 m_move_pkthdr(n, m);
944 n->m_len = 0; /* NB: m_gethdr does not set */
945 n->m_data += needed_space;
946 /*
947 * Pull up Ethernet header to create the expected layout.
948 * We could use m_pullup but that's overkill (i.e. we don't
949 * need the actual data) and it cannot fail so do it inline
950 * for speed.
951 */
952 /* NB: struct ether_header is known to be contiguous */
953 n->m_len += sizeof(struct ether_header);
954 m->m_len -= sizeof(struct ether_header);
955 m->m_data += sizeof(struct ether_header);
956 /*
957 * Replace the head of the chain.
958 */
959 n->m_next = m;
960 m = n;
961 }
962 return m;
963 #undef TO_BE_RECLAIMED
964 }
965
966 /*
967 * Return the transmit key to use in sending a unicast frame.
968 * If a unicast key is set we use that. When no unicast key is set
969 * we fall back to the default transmit key.
970 */
971 static __inline struct ieee80211_key *
972 ieee80211_crypto_getucastkey(struct ieee80211vap *vap,
973 struct ieee80211_node *ni)
974 {
975 if (IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)) {
976 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
977 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
978 return NULL;
979 return &vap->iv_nw_keys[vap->iv_def_txkey];
980 } else {
981 return &ni->ni_ucastkey;
982 }
983 }
984
985 /*
986 * Return the transmit key to use in sending a multicast frame.
987 * Multicast traffic always uses the group key which is installed as
988 * the default tx key.
989 */
990 static __inline struct ieee80211_key *
991 ieee80211_crypto_getmcastkey(struct ieee80211vap *vap,
992 struct ieee80211_node *ni)
993 {
994 if (vap->iv_def_txkey == IEEE80211_KEYIX_NONE ||
995 IEEE80211_KEY_UNDEFINED(&vap->iv_nw_keys[vap->iv_def_txkey]))
996 return NULL;
997 return &vap->iv_nw_keys[vap->iv_def_txkey];
998 }
999
1000 /*
1001 * Encapsulate an outbound data frame. The mbuf chain is updated.
1002 * If an error is encountered NULL is returned. The caller is required
1003 * to provide a node reference and pullup the ethernet header in the
1004 * first mbuf.
1005 *
1006 * NB: Packet is assumed to be processed by ieee80211_classify which
1007 * marked EAPOL frames w/ M_EAPOL.
1008 */
1009 struct mbuf *
1010 ieee80211_encap(struct ieee80211vap *vap, struct ieee80211_node *ni,
1011 struct mbuf *m)
1012 {
1013 #define WH4(wh) ((struct ieee80211_frame_addr4 *)(wh))
1014 struct ieee80211com *ic = ni->ni_ic;
1015 #ifdef IEEE80211_SUPPORT_MESH
1016 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1017 struct ieee80211_meshcntl_ae10 *mc;
1018 #endif
1019 struct ether_header eh;
1020 struct ieee80211_frame *wh;
1021 struct ieee80211_key *key;
1022 struct llc *llc;
1023 int hdrsize, hdrspace, datalen, addqos, txfrag, is4addr;
1024 ieee80211_seq seqno;
1025 int meshhdrsize, meshae;
1026 uint8_t *qos;
1027
1028 /*
1029 * Copy existing Ethernet header to a safe place. The
1030 * rest of the code assumes it's ok to strip it when
1031 * reorganizing state for the final encapsulation.
1032 */
1033 KASSERT(m->m_len >= sizeof(eh), ("no ethernet header!"));
1034 ETHER_HEADER_COPY(&eh, mtod(m, caddr_t));
1035
1036 /*
1037 * Insure space for additional headers. First identify
1038 * transmit key to use in calculating any buffer adjustments
1039 * required. This is also used below to do privacy
1040 * encapsulation work. Then calculate the 802.11 header
1041 * size and any padding required by the driver.
1042 *
1043 * Note key may be NULL if we fall back to the default
1044 * transmit key and that is not set. In that case the
1045 * buffer may not be expanded as needed by the cipher
1046 * routines, but they will/should discard it.
1047 */
1048 if (vap->iv_flags & IEEE80211_F_PRIVACY) {
1049 if (vap->iv_opmode == IEEE80211_M_STA ||
1050 !IEEE80211_IS_MULTICAST(eh.ether_dhost) ||
1051 (vap->iv_opmode == IEEE80211_M_WDS &&
1052 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY)))
1053 key = ieee80211_crypto_getucastkey(vap, ni);
1054 else
1055 key = ieee80211_crypto_getmcastkey(vap, ni);
1056 if (key == NULL && (m->m_flags & M_EAPOL) == 0) {
1057 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_CRYPTO,
1058 eh.ether_dhost,
1059 "no default transmit key (%s) deftxkey %u",
1060 __func__, vap->iv_def_txkey);
1061 vap->iv_stats.is_tx_nodefkey++;
1062 goto bad;
1063 }
1064 } else
1065 key = NULL;
1066 /*
1067 * XXX Some ap's don't handle QoS-encapsulated EAPOL
1068 * frames so suppress use. This may be an issue if other
1069 * ap's require all data frames to be QoS-encapsulated
1070 * once negotiated in which case we'll need to make this
1071 * configurable.
1072 */
1073 addqos = (ni->ni_flags & (IEEE80211_NODE_QOS|IEEE80211_NODE_HT)) &&
1074 (m->m_flags & M_EAPOL) == 0;
1075 if (addqos)
1076 hdrsize = sizeof(struct ieee80211_qosframe);
1077 else
1078 hdrsize = sizeof(struct ieee80211_frame);
1079 #ifdef IEEE80211_SUPPORT_MESH
1080 if (vap->iv_opmode == IEEE80211_M_MBSS) {
1081 /*
1082 * Mesh data frames are encapsulated according to the
1083 * rules of Section 11B.8.5 (p.139 of D3.0 spec).
1084 * o Group Addressed data (aka multicast) originating
1085 * at the local sta are sent w/ 3-address format and
1086 * address extension mode 00
1087 * o Individually Addressed data (aka unicast) originating
1088 * at the local sta are sent w/ 4-address format and
1089 * address extension mode 00
1090 * o Group Addressed data forwarded from a non-mesh sta are
1091 * sent w/ 3-address format and address extension mode 01
1092 * o Individually Address data from another sta are sent
1093 * w/ 4-address format and address extension mode 10
1094 */
1095 is4addr = 0; /* NB: don't use, disable */
1096 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost))
1097 hdrsize += IEEE80211_ADDR_LEN; /* unicast are 4-addr */
1098 meshhdrsize = sizeof(struct ieee80211_meshcntl);
1099 /* XXX defines for AE modes */
1100 if (IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr)) {
1101 if (!IEEE80211_IS_MULTICAST(eh.ether_dhost))
1102 meshae = 0;
1103 else
1104 meshae = 4; /* NB: pseudo */
1105 } else if (IEEE80211_IS_MULTICAST(eh.ether_dhost)) {
1106 meshae = 1;
1107 meshhdrsize += 1*IEEE80211_ADDR_LEN;
1108 } else {
1109 meshae = 2;
1110 meshhdrsize += 2*IEEE80211_ADDR_LEN;
1111 }
1112 } else {
1113 #endif
1114 /*
1115 * 4-address frames need to be generated for:
1116 * o packets sent through a WDS vap (IEEE80211_M_WDS)
1117 * o packets sent through a vap marked for relaying
1118 * (e.g. a station operating with dynamic WDS)
1119 */
1120 is4addr = vap->iv_opmode == IEEE80211_M_WDS ||
1121 ((vap->iv_flags_ext & IEEE80211_FEXT_4ADDR) &&
1122 !IEEE80211_ADDR_EQ(eh.ether_shost, vap->iv_myaddr));
1123 if (is4addr)
1124 hdrsize += IEEE80211_ADDR_LEN;
1125 meshhdrsize = meshae = 0;
1126 #ifdef IEEE80211_SUPPORT_MESH
1127 }
1128 #endif
1129 /*
1130 * Honor driver DATAPAD requirement.
1131 */
1132 if (ic->ic_flags & IEEE80211_F_DATAPAD)
1133 hdrspace = roundup(hdrsize, sizeof(uint32_t));
1134 else
1135 hdrspace = hdrsize;
1136
1137 if (__predict_true((m->m_flags & M_FF) == 0)) {
1138 /*
1139 * Normal frame.
1140 */
1141 m = ieee80211_mbuf_adjust(vap, hdrspace + meshhdrsize, key, m);
1142 if (m == NULL) {
1143 /* NB: ieee80211_mbuf_adjust handles msgs+statistics */
1144 goto bad;
1145 }
1146 /* NB: this could be optimized 'cuz of ieee80211_mbuf_adjust */
1147 m_adj(m, sizeof(struct ether_header) - sizeof(struct llc));
1148 llc = mtod(m, struct llc *);
1149 llc->llc_dsap = llc->llc_ssap = LLC_SNAP_LSAP;
1150 llc->llc_control = LLC_UI;
1151 llc->llc_snap.org_code[0] = 0;
1152 llc->llc_snap.org_code[1] = 0;
1153 llc->llc_snap.org_code[2] = 0;
1154 llc->llc_snap.ether_type = eh.ether_type;
1155 } else {
1156 #ifdef IEEE80211_SUPPORT_SUPERG
1157 /*
1158 * Aggregated frame.
1159 */
1160 m = ieee80211_ff_encap(vap, m, hdrspace + meshhdrsize, key);
1161 if (m == NULL)
1162 #endif
1163 goto bad;
1164 }
1165 datalen = m->m_pkthdr.len; /* NB: w/o 802.11 header */
1166
1167 M_PREPEND(m, hdrspace + meshhdrsize, M_DONTWAIT);
1168 if (m == NULL) {
1169 vap->iv_stats.is_tx_nobuf++;
1170 goto bad;
1171 }
1172 wh = mtod(m, struct ieee80211_frame *);
1173 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_DATA;
1174 *(uint16_t *)wh->i_dur = 0;
1175 qos = NULL; /* NB: quiet compiler */
1176 if (is4addr) {
1177 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1178 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1179 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1180 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1181 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
1182 } else switch (vap->iv_opmode) {
1183 case IEEE80211_M_STA:
1184 wh->i_fc[1] = IEEE80211_FC1_DIR_TODS;
1185 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_bssid);
1186 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1187 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1188 break;
1189 case IEEE80211_M_IBSS:
1190 case IEEE80211_M_AHDEMO:
1191 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
1192 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1193 IEEE80211_ADDR_COPY(wh->i_addr2, eh.ether_shost);
1194 /*
1195 * NB: always use the bssid from iv_bss as the
1196 * neighbor's may be stale after an ibss merge
1197 */
1198 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_bss->ni_bssid);
1199 break;
1200 case IEEE80211_M_HOSTAP:
1201 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1202 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1203 IEEE80211_ADDR_COPY(wh->i_addr2, ni->ni_bssid);
1204 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
1205 break;
1206 #ifdef IEEE80211_SUPPORT_MESH
1207 case IEEE80211_M_MBSS:
1208 /* NB: offset by hdrspace to deal with DATAPAD */
1209 mc = (struct ieee80211_meshcntl_ae10 *)
1210 (mtod(m, uint8_t *) + hdrspace);
1211 switch (meshae) {
1212 case 0: /* ucast, no proxy */
1213 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1214 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1215 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1216 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1217 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, eh.ether_shost);
1218 mc->mc_flags = 0;
1219 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1220 break;
1221 case 4: /* mcast, no proxy */
1222 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1223 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1224 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1225 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_shost);
1226 mc->mc_flags = 0; /* NB: AE is really 0 */
1227 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1228 break;
1229 case 1: /* mcast, proxy */
1230 wh->i_fc[1] = IEEE80211_FC1_DIR_FROMDS;
1231 IEEE80211_ADDR_COPY(wh->i_addr1, eh.ether_dhost);
1232 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1233 IEEE80211_ADDR_COPY(wh->i_addr3, vap->iv_myaddr);
1234 mc->mc_flags = 1;
1235 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_shost);
1236 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1237 break;
1238 case 2: /* ucast, proxy */
1239 wh->i_fc[1] = IEEE80211_FC1_DIR_DSTODS;
1240 IEEE80211_ADDR_COPY(wh->i_addr1, ni->ni_macaddr);
1241 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
1242 /* XXX not right, need MeshDA */
1243 IEEE80211_ADDR_COPY(wh->i_addr3, eh.ether_dhost);
1244 /* XXX assume are MeshSA */
1245 IEEE80211_ADDR_COPY(WH4(wh)->i_addr4, vap->iv_myaddr);
1246 mc->mc_flags = 2;
1247 IEEE80211_ADDR_COPY(mc->mc_addr4, eh.ether_dhost);
1248 IEEE80211_ADDR_COPY(mc->mc_addr5, eh.ether_shost);
1249 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1250 break;
1251 default:
1252 KASSERT(0, ("meshae %d", meshae));
1253 break;
1254 }
1255 mc->mc_ttl = ms->ms_ttl;
1256 ms->ms_seq++;
1257 LE_WRITE_4(mc->mc_seq, ms->ms_seq);
1258 break;
1259 #endif
1260 case IEEE80211_M_WDS: /* NB: is4addr should always be true */
1261 default:
1262 goto bad;
1263 }
1264 if (m->m_flags & M_MORE_DATA)
1265 wh->i_fc[1] |= IEEE80211_FC1_MORE_DATA;
1266 if (addqos) {
1267 int ac, tid;
1268
1269 if (is4addr) {
1270 qos = ((struct ieee80211_qosframe_addr4 *) wh)->i_qos;
1271 /* NB: mesh case handled earlier */
1272 } else if (vap->iv_opmode != IEEE80211_M_MBSS)
1273 qos = ((struct ieee80211_qosframe *) wh)->i_qos;
1274 ac = M_WME_GETAC(m);
1275 /* map from access class/queue to 11e header priorty value */
1276 tid = WME_AC_TO_TID(ac);
1277 qos[0] = tid & IEEE80211_QOS_TID;
1278 if (ic->ic_wme.wme_wmeChanParams.cap_wmeParams[ac].wmep_noackPolicy)
1279 qos[0] |= IEEE80211_QOS_ACKPOLICY_NOACK;
1280 qos[1] = 0;
1281 wh->i_fc[0] |= IEEE80211_FC0_SUBTYPE_QOS;
1282
1283 if ((m->m_flags & M_AMPDU_MPDU) == 0) {
1284 /*
1285 * NB: don't assign a sequence # to potential
1286 * aggregates; we expect this happens at the
1287 * point the frame comes off any aggregation q
1288 * as otherwise we may introduce holes in the
1289 * BA sequence space and/or make window accouting
1290 * more difficult.
1291 *
1292 * XXX may want to control this with a driver
1293 * capability; this may also change when we pull
1294 * aggregation up into net80211
1295 */
1296 seqno = ni->ni_txseqs[tid]++;
1297 *(uint16_t *)wh->i_seq =
1298 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1299 M_SEQNO_SET(m, seqno);
1300 }
1301 } else {
1302 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
1303 *(uint16_t *)wh->i_seq =
1304 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
1305 M_SEQNO_SET(m, seqno);
1306 }
1307
1308
1309 /* check if xmit fragmentation is required */
1310 txfrag = (m->m_pkthdr.len > vap->iv_fragthreshold &&
1311 !IEEE80211_IS_MULTICAST(wh->i_addr1) &&
1312 (vap->iv_caps & IEEE80211_C_TXFRAG) &&
1313 (m->m_flags & (M_FF | M_AMPDU_MPDU)) == 0);
1314 if (key != NULL) {
1315 /*
1316 * IEEE 802.1X: send EAPOL frames always in the clear.
1317 * WPA/WPA2: encrypt EAPOL keys when pairwise keys are set.
1318 */
1319 if ((m->m_flags & M_EAPOL) == 0 ||
1320 ((vap->iv_flags & IEEE80211_F_WPA) &&
1321 (vap->iv_opmode == IEEE80211_M_STA ?
1322 !IEEE80211_KEY_UNDEFINED(key) :
1323 !IEEE80211_KEY_UNDEFINED(&ni->ni_ucastkey)))) {
1324 wh->i_fc[1] |= IEEE80211_FC1_WEP;
1325 if (!ieee80211_crypto_enmic(vap, key, m, txfrag)) {
1326 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_OUTPUT,
1327 eh.ether_dhost,
1328 "%s", "enmic failed, discard frame");
1329 vap->iv_stats.is_crypto_enmicfail++;
1330 goto bad;
1331 }
1332 }
1333 }
1334 if (txfrag && !ieee80211_fragment(vap, m, hdrsize,
1335 key != NULL ? key->wk_cipher->ic_header : 0, vap->iv_fragthreshold))
1336 goto bad;
1337
1338 m->m_flags |= M_ENCAP; /* mark encapsulated */
1339
1340 IEEE80211_NODE_STAT(ni, tx_data);
1341 if (IEEE80211_IS_MULTICAST(wh->i_addr1)) {
1342 IEEE80211_NODE_STAT(ni, tx_mcast);
1343 m->m_flags |= M_MCAST;
1344 } else
1345 IEEE80211_NODE_STAT(ni, tx_ucast);
1346 IEEE80211_NODE_STAT_ADD(ni, tx_bytes, datalen);
1347
1348 return m;
1349 bad:
1350 if (m != NULL)
1351 m_freem(m);
1352 return NULL;
1353 #undef WH4
1354 }
1355
1356 /*
1357 * Fragment the frame according to the specified mtu.
1358 * The size of the 802.11 header (w/o padding) is provided
1359 * so we don't need to recalculate it. We create a new
1360 * mbuf for each fragment and chain it through m_nextpkt;
1361 * we might be able to optimize this by reusing the original
1362 * packet's mbufs but that is significantly more complicated.
1363 */
1364 static int
1365 ieee80211_fragment(struct ieee80211vap *vap, struct mbuf *m0,
1366 u_int hdrsize, u_int ciphdrsize, u_int mtu)
1367 {
1368 struct ieee80211_frame *wh, *whf;
1369 struct mbuf *m, *prev, *next;
1370 u_int totalhdrsize, fragno, fragsize, off, remainder, payload;
1371
1372 KASSERT(m0->m_nextpkt == NULL, ("mbuf already chained?"));
1373 KASSERT(m0->m_pkthdr.len > mtu,
1374 ("pktlen %u mtu %u", m0->m_pkthdr.len, mtu));
1375
1376 wh = mtod(m0, struct ieee80211_frame *);
1377 /* NB: mark the first frag; it will be propagated below */
1378 wh->i_fc[1] |= IEEE80211_FC1_MORE_FRAG;
1379 totalhdrsize = hdrsize + ciphdrsize;
1380 fragno = 1;
1381 off = mtu - ciphdrsize;
1382 remainder = m0->m_pkthdr.len - off;
1383 prev = m0;
1384 do {
1385 fragsize = totalhdrsize + remainder;
1386 if (fragsize > mtu)
1387 fragsize = mtu;
1388 /* XXX fragsize can be >2048! */
1389 KASSERT(fragsize < MCLBYTES,
1390 ("fragment size %u too big!", fragsize));
1391 if (fragsize > MHLEN)
1392 m = m_getcl(M_DONTWAIT, MT_DATA, M_PKTHDR);
1393 else
1394 m = m_gethdr(M_DONTWAIT, MT_DATA);
1395 if (m == NULL)
1396 goto bad;
1397 /* leave room to prepend any cipher header */
1398 m_align(m, fragsize - ciphdrsize);
1399
1400 /*
1401 * Form the header in the fragment. Note that since
1402 * we mark the first fragment with the MORE_FRAG bit
1403 * it automatically is propagated to each fragment; we
1404 * need only clear it on the last fragment (done below).
1405 */
1406 whf = mtod(m, struct ieee80211_frame *);
1407 memcpy(whf, wh, hdrsize);
1408 *(uint16_t *)&whf->i_seq[0] |= htole16(
1409 (fragno & IEEE80211_SEQ_FRAG_MASK) <<
1410 IEEE80211_SEQ_FRAG_SHIFT);
1411 fragno++;
1412
1413 payload = fragsize - totalhdrsize;
1414 /* NB: destination is known to be contiguous */
1415 m_copydata(m0, off, payload, mtod(m, uint8_t *) + hdrsize);
1416 m->m_len = hdrsize + payload;
1417 m->m_pkthdr.len = hdrsize + payload;
1418 m->m_flags |= M_FRAG;
1419
1420 /* chain up the fragment */
1421 prev->m_nextpkt = m;
1422 prev = m;
1423
1424 /* deduct fragment just formed */
1425 remainder -= payload;
1426 off += payload;
1427 } while (remainder != 0);
1428
1429 /* set the last fragment */
1430 m->m_flags |= M_LASTFRAG;
1431 whf->i_fc[1] &= ~IEEE80211_FC1_MORE_FRAG;
1432
1433 /* strip first mbuf now that everything has been copied */
1434 m_adj(m0, -(m0->m_pkthdr.len - (mtu - ciphdrsize)));
1435 m0->m_flags |= M_FIRSTFRAG | M_FRAG;
1436
1437 vap->iv_stats.is_tx_fragframes++;
1438 vap->iv_stats.is_tx_frags += fragno-1;
1439
1440 return 1;
1441 bad:
1442 /* reclaim fragments but leave original frame for caller to free */
1443 for (m = m0->m_nextpkt; m != NULL; m = next) {
1444 next = m->m_nextpkt;
1445 m->m_nextpkt = NULL; /* XXX paranoid */
1446 m_freem(m);
1447 }
1448 m0->m_nextpkt = NULL;
1449 return 0;
1450 }
1451
1452 /*
1453 * Add a supported rates element id to a frame.
1454 */
1455 uint8_t *
1456 ieee80211_add_rates(uint8_t *frm, const struct ieee80211_rateset *rs)
1457 {
1458 int nrates;
1459
1460 *frm++ = IEEE80211_ELEMID_RATES;
1461 nrates = rs->rs_nrates;
1462 if (nrates > IEEE80211_RATE_SIZE)
1463 nrates = IEEE80211_RATE_SIZE;
1464 *frm++ = nrates;
1465 memcpy(frm, rs->rs_rates, nrates);
1466 return frm + nrates;
1467 }
1468
1469 /*
1470 * Add an extended supported rates element id to a frame.
1471 */
1472 uint8_t *
1473 ieee80211_add_xrates(uint8_t *frm, const struct ieee80211_rateset *rs)
1474 {
1475 /*
1476 * Add an extended supported rates element if operating in 11g mode.
1477 */
1478 if (rs->rs_nrates > IEEE80211_RATE_SIZE) {
1479 int nrates = rs->rs_nrates - IEEE80211_RATE_SIZE;
1480 *frm++ = IEEE80211_ELEMID_XRATES;
1481 *frm++ = nrates;
1482 memcpy(frm, rs->rs_rates + IEEE80211_RATE_SIZE, nrates);
1483 frm += nrates;
1484 }
1485 return frm;
1486 }
1487
1488 /*
1489 * Add an ssid element to a frame.
1490 */
1491 static uint8_t *
1492 ieee80211_add_ssid(uint8_t *frm, const uint8_t *ssid, u_int len)
1493 {
1494 *frm++ = IEEE80211_ELEMID_SSID;
1495 *frm++ = len;
1496 memcpy(frm, ssid, len);
1497 return frm + len;
1498 }
1499
1500 /*
1501 * Add an erp element to a frame.
1502 */
1503 static uint8_t *
1504 ieee80211_add_erp(uint8_t *frm, struct ieee80211com *ic)
1505 {
1506 uint8_t erp;
1507
1508 *frm++ = IEEE80211_ELEMID_ERP;
1509 *frm++ = 1;
1510 erp = 0;
1511 if (ic->ic_nonerpsta != 0)
1512 erp |= IEEE80211_ERP_NON_ERP_PRESENT;
1513 if (ic->ic_flags & IEEE80211_F_USEPROT)
1514 erp |= IEEE80211_ERP_USE_PROTECTION;
1515 if (ic->ic_flags & IEEE80211_F_USEBARKER)
1516 erp |= IEEE80211_ERP_LONG_PREAMBLE;
1517 *frm++ = erp;
1518 return frm;
1519 }
1520
1521 /*
1522 * Add a CFParams element to a frame.
1523 */
1524 static uint8_t *
1525 ieee80211_add_cfparms(uint8_t *frm, struct ieee80211com *ic)
1526 {
1527 #define ADDSHORT(frm, v) do { \
1528 LE_WRITE_2(frm, v); \
1529 frm += 2; \
1530 } while (0)
1531 *frm++ = IEEE80211_ELEMID_CFPARMS;
1532 *frm++ = 6;
1533 *frm++ = 0; /* CFP count */
1534 *frm++ = 2; /* CFP period */
1535 ADDSHORT(frm, 0); /* CFP MaxDuration (TU) */
1536 ADDSHORT(frm, 0); /* CFP CurRemaining (TU) */
1537 return frm;
1538 #undef ADDSHORT
1539 }
1540
1541 static __inline uint8_t *
1542 add_appie(uint8_t *frm, const struct ieee80211_appie *ie)
1543 {
1544 memcpy(frm, ie->ie_data, ie->ie_len);
1545 return frm + ie->ie_len;
1546 }
1547
1548 static __inline uint8_t *
1549 add_ie(uint8_t *frm, const uint8_t *ie)
1550 {
1551 memcpy(frm, ie, 2 + ie[1]);
1552 return frm + 2 + ie[1];
1553 }
1554
1555 #define WME_OUI_BYTES 0x00, 0x50, 0xf2
1556 /*
1557 * Add a WME information element to a frame.
1558 */
1559 static uint8_t *
1560 ieee80211_add_wme_info(uint8_t *frm, struct ieee80211_wme_state *wme)
1561 {
1562 static const struct ieee80211_wme_info info = {
1563 .wme_id = IEEE80211_ELEMID_VENDOR,
1564 .wme_len = sizeof(struct ieee80211_wme_info) - 2,
1565 .wme_oui = { WME_OUI_BYTES },
1566 .wme_type = WME_OUI_TYPE,
1567 .wme_subtype = WME_INFO_OUI_SUBTYPE,
1568 .wme_version = WME_VERSION,
1569 .wme_info = 0,
1570 };
1571 memcpy(frm, &info, sizeof(info));
1572 return frm + sizeof(info);
1573 }
1574
1575 /*
1576 * Add a WME parameters element to a frame.
1577 */
1578 static uint8_t *
1579 ieee80211_add_wme_param(uint8_t *frm, struct ieee80211_wme_state *wme)
1580 {
1581 #define SM(_v, _f) (((_v) << _f##_S) & _f)
1582 #define ADDSHORT(frm, v) do { \
1583 LE_WRITE_2(frm, v); \
1584 frm += 2; \
1585 } while (0)
1586 /* NB: this works 'cuz a param has an info at the front */
1587 static const struct ieee80211_wme_info param = {
1588 .wme_id = IEEE80211_ELEMID_VENDOR,
1589 .wme_len = sizeof(struct ieee80211_wme_param) - 2,
1590 .wme_oui = { WME_OUI_BYTES },
1591 .wme_type = WME_OUI_TYPE,
1592 .wme_subtype = WME_PARAM_OUI_SUBTYPE,
1593 .wme_version = WME_VERSION,
1594 };
1595 int i;
1596
1597 memcpy(frm, ¶m, sizeof(param));
1598 frm += __offsetof(struct ieee80211_wme_info, wme_info);
1599 *frm++ = wme->wme_bssChanParams.cap_info; /* AC info */
1600 *frm++ = 0; /* reserved field */
1601 for (i = 0; i < WME_NUM_AC; i++) {
1602 const struct wmeParams *ac =
1603 &wme->wme_bssChanParams.cap_wmeParams[i];
1604 *frm++ = SM(i, WME_PARAM_ACI)
1605 | SM(ac->wmep_acm, WME_PARAM_ACM)
1606 | SM(ac->wmep_aifsn, WME_PARAM_AIFSN)
1607 ;
1608 *frm++ = SM(ac->wmep_logcwmax, WME_PARAM_LOGCWMAX)
1609 | SM(ac->wmep_logcwmin, WME_PARAM_LOGCWMIN)
1610 ;
1611 ADDSHORT(frm, ac->wmep_txopLimit);
1612 }
1613 return frm;
1614 #undef SM
1615 #undef ADDSHORT
1616 }
1617 #undef WME_OUI_BYTES
1618
1619 /*
1620 * Add an 11h Power Constraint element to a frame.
1621 */
1622 static uint8_t *
1623 ieee80211_add_powerconstraint(uint8_t *frm, struct ieee80211vap *vap)
1624 {
1625 const struct ieee80211_channel *c = vap->iv_bss->ni_chan;
1626 /* XXX per-vap tx power limit? */
1627 int8_t limit = vap->iv_ic->ic_txpowlimit / 2;
1628
1629 frm[0] = IEEE80211_ELEMID_PWRCNSTR;
1630 frm[1] = 1;
1631 frm[2] = c->ic_maxregpower > limit ? c->ic_maxregpower - limit : 0;
1632 return frm + 3;
1633 }
1634
1635 /*
1636 * Add an 11h Power Capability element to a frame.
1637 */
1638 static uint8_t *
1639 ieee80211_add_powercapability(uint8_t *frm, const struct ieee80211_channel *c)
1640 {
1641 frm[0] = IEEE80211_ELEMID_PWRCAP;
1642 frm[1] = 2;
1643 frm[2] = c->ic_minpower;
1644 frm[3] = c->ic_maxpower;
1645 return frm + 4;
1646 }
1647
1648 /*
1649 * Add an 11h Supported Channels element to a frame.
1650 */
1651 static uint8_t *
1652 ieee80211_add_supportedchannels(uint8_t *frm, struct ieee80211com *ic)
1653 {
1654 static const int ielen = 26;
1655
1656 frm[0] = IEEE80211_ELEMID_SUPPCHAN;
1657 frm[1] = ielen;
1658 /* XXX not correct */
1659 memcpy(frm+2, ic->ic_chan_avail, ielen);
1660 return frm + 2 + ielen;
1661 }
1662
1663 /*
1664 * Add an 11h Channel Switch Announcement element to a frame.
1665 * Note that we use the per-vap CSA count to adjust the global
1666 * counter so we can use this routine to form probe response
1667 * frames and get the current count.
1668 */
1669 static uint8_t *
1670 ieee80211_add_csa(uint8_t *frm, struct ieee80211vap *vap)
1671 {
1672 struct ieee80211com *ic = vap->iv_ic;
1673 struct ieee80211_csa_ie *csa = (struct ieee80211_csa_ie *) frm;
1674
1675 csa->csa_ie = IEEE80211_ELEMID_CSA;
1676 csa->csa_len = 3;
1677 csa->csa_mode = 1; /* XXX force quiet on channel */
1678 csa->csa_newchan = ieee80211_chan2ieee(ic, ic->ic_csa_newchan);
1679 csa->csa_count = ic->ic_csa_count - vap->iv_csa_count;
1680 return frm + sizeof(*csa);
1681 }
1682
1683 /*
1684 * Add an 11h country information element to a frame.
1685 */
1686 static uint8_t *
1687 ieee80211_add_countryie(uint8_t *frm, struct ieee80211com *ic)
1688 {
1689
1690 if (ic->ic_countryie == NULL ||
1691 ic->ic_countryie_chan != ic->ic_bsschan) {
1692 /*
1693 * Handle lazy construction of ie. This is done on
1694 * first use and after a channel change that requires
1695 * re-calculation.
1696 */
1697 if (ic->ic_countryie != NULL)
1698 free(ic->ic_countryie, M_80211_NODE_IE);
1699 ic->ic_countryie = ieee80211_alloc_countryie(ic);
1700 if (ic->ic_countryie == NULL)
1701 return frm;
1702 ic->ic_countryie_chan = ic->ic_bsschan;
1703 }
1704 return add_appie(frm, ic->ic_countryie);
1705 }
1706
1707 uint8_t *
1708 ieee80211_add_wpa(uint8_t *frm, const struct ieee80211vap *vap)
1709 {
1710 if (vap->iv_flags & IEEE80211_F_WPA1 && vap->iv_wpa_ie != NULL)
1711 return (add_ie(frm, vap->iv_wpa_ie));
1712 else {
1713 /* XXX else complain? */
1714 return (frm);
1715 }
1716 }
1717
1718 uint8_t *
1719 ieee80211_add_rsn(uint8_t *frm, const struct ieee80211vap *vap)
1720 {
1721 if (vap->iv_flags & IEEE80211_F_WPA2 && vap->iv_rsn_ie != NULL)
1722 return (add_ie(frm, vap->iv_rsn_ie));
1723 else {
1724 /* XXX else complain? */
1725 return (frm);
1726 }
1727 }
1728
1729 uint8_t *
1730 ieee80211_add_qos(uint8_t *frm, const struct ieee80211_node *ni)
1731 {
1732 if (ni->ni_flags & IEEE80211_NODE_QOS) {
1733 *frm++ = IEEE80211_ELEMID_QOS;
1734 *frm++ = 1;
1735 *frm++ = 0;
1736 }
1737
1738 return (frm);
1739 }
1740
1741 /*
1742 * Send a probe request frame with the specified ssid
1743 * and any optional information element data.
1744 */
1745 int
1746 ieee80211_send_probereq(struct ieee80211_node *ni,
1747 const uint8_t sa[IEEE80211_ADDR_LEN],
1748 const uint8_t da[IEEE80211_ADDR_LEN],
1749 const uint8_t bssid[IEEE80211_ADDR_LEN],
1750 const uint8_t *ssid, size_t ssidlen)
1751 {
1752 struct ieee80211vap *vap = ni->ni_vap;
1753 struct ieee80211com *ic = ni->ni_ic;
1754 const struct ieee80211_txparam *tp;
1755 struct ieee80211_bpf_params params;
1756 struct ieee80211_frame *wh;
1757 const struct ieee80211_rateset *rs;
1758 struct mbuf *m;
1759 uint8_t *frm;
1760
1761 if (vap->iv_state == IEEE80211_S_CAC) {
1762 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
1763 "block %s frame in CAC state", "probe request");
1764 vap->iv_stats.is_tx_badstate++;
1765 return EIO; /* XXX */
1766 }
1767
1768 /*
1769 * Hold a reference on the node so it doesn't go away until after
1770 * the xmit is complete all the way in the driver. On error we
1771 * will remove our reference.
1772 */
1773 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1774 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
1775 __func__, __LINE__,
1776 ni, ether_sprintf(ni->ni_macaddr),
1777 ieee80211_node_refcnt(ni)+1);
1778 ieee80211_ref_node(ni);
1779
1780 /*
1781 * prreq frame format
1782 * [tlv] ssid
1783 * [tlv] supported rates
1784 * [tlv] RSN (optional)
1785 * [tlv] extended supported rates
1786 * [tlv] WPA (optional)
1787 * [tlv] user-specified ie's
1788 */
1789 m = ieee80211_getmgtframe(&frm,
1790 ic->ic_headroom + sizeof(struct ieee80211_frame),
1791 2 + IEEE80211_NWID_LEN
1792 + 2 + IEEE80211_RATE_SIZE
1793 + sizeof(struct ieee80211_ie_wpa)
1794 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
1795 + sizeof(struct ieee80211_ie_wpa)
1796 + (vap->iv_appie_probereq != NULL ?
1797 vap->iv_appie_probereq->ie_len : 0)
1798 );
1799 if (m == NULL) {
1800 vap->iv_stats.is_tx_nobuf++;
1801 ieee80211_free_node(ni);
1802 return ENOMEM;
1803 }
1804
1805 frm = ieee80211_add_ssid(frm, ssid, ssidlen);
1806 rs = ieee80211_get_suprates(ic, ic->ic_curchan);
1807 frm = ieee80211_add_rates(frm, rs);
1808 frm = ieee80211_add_rsn(frm, vap);
1809 frm = ieee80211_add_xrates(frm, rs);
1810 frm = ieee80211_add_wpa(frm, vap);
1811 if (vap->iv_appie_probereq != NULL)
1812 frm = add_appie(frm, vap->iv_appie_probereq);
1813 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
1814
1815 KASSERT(M_LEADINGSPACE(m) >= sizeof(struct ieee80211_frame),
1816 ("leading space %zd", M_LEADINGSPACE(m)));
1817 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
1818 if (m == NULL) {
1819 /* NB: cannot happen */
1820 ieee80211_free_node(ni);
1821 return ENOMEM;
1822 }
1823
1824 wh = mtod(m, struct ieee80211_frame *);
1825 ieee80211_send_setup(ni, m,
1826 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_REQ,
1827 IEEE80211_NONQOS_TID, sa, da, bssid);
1828 /* XXX power management? */
1829 m->m_flags |= M_ENCAP; /* mark encapsulated */
1830
1831 M_WME_SETAC(m, WME_AC_BE);
1832
1833 IEEE80211_NODE_STAT(ni, tx_probereq);
1834 IEEE80211_NODE_STAT(ni, tx_mgmt);
1835
1836 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
1837 "send probe req on channel %u bssid %s ssid \"%.*s\"\n",
1838 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(bssid),
1839 ssidlen, ssid);
1840
1841 memset(¶ms, 0, sizeof(params));
1842 params.ibp_pri = M_WME_GETAC(m);
1843 tp = &vap->iv_txparms[ieee80211_chan2mode(ic->ic_curchan)];
1844 params.ibp_rate0 = tp->mgmtrate;
1845 if (IEEE80211_IS_MULTICAST(da)) {
1846 params.ibp_flags |= IEEE80211_BPF_NOACK;
1847 params.ibp_try0 = 1;
1848 } else
1849 params.ibp_try0 = tp->maxretry;
1850 params.ibp_power = ni->ni_txpower;
1851 return ic->ic_raw_xmit(ni, m, ¶ms);
1852 }
1853
1854 /*
1855 * Calculate capability information for mgt frames.
1856 */
1857 uint16_t
1858 ieee80211_getcapinfo(struct ieee80211vap *vap, struct ieee80211_channel *chan)
1859 {
1860 struct ieee80211com *ic = vap->iv_ic;
1861 uint16_t capinfo;
1862
1863 KASSERT(vap->iv_opmode != IEEE80211_M_STA, ("station mode"));
1864
1865 if (vap->iv_opmode == IEEE80211_M_HOSTAP)
1866 capinfo = IEEE80211_CAPINFO_ESS;
1867 else if (vap->iv_opmode == IEEE80211_M_IBSS)
1868 capinfo = IEEE80211_CAPINFO_IBSS;
1869 else
1870 capinfo = 0;
1871 if (vap->iv_flags & IEEE80211_F_PRIVACY)
1872 capinfo |= IEEE80211_CAPINFO_PRIVACY;
1873 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
1874 IEEE80211_IS_CHAN_2GHZ(chan))
1875 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
1876 if (ic->ic_flags & IEEE80211_F_SHSLOT)
1877 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
1878 if (IEEE80211_IS_CHAN_5GHZ(chan) && (vap->iv_flags & IEEE80211_F_DOTH))
1879 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
1880 return capinfo;
1881 }
1882
1883 /*
1884 * Send a management frame. The node is for the destination (or ic_bss
1885 * when in station mode). Nodes other than ic_bss have their reference
1886 * count bumped to reflect our use for an indeterminant time.
1887 */
1888 int
1889 ieee80211_send_mgmt(struct ieee80211_node *ni, int type, int arg)
1890 {
1891 #define HTFLAGS (IEEE80211_NODE_HT | IEEE80211_NODE_HTCOMPAT)
1892 #define senderr(_x, _v) do { vap->iv_stats._v++; ret = _x; goto bad; } while (0)
1893 struct ieee80211vap *vap = ni->ni_vap;
1894 struct ieee80211com *ic = ni->ni_ic;
1895 struct ieee80211_node *bss = vap->iv_bss;
1896 struct ieee80211_bpf_params params;
1897 struct mbuf *m;
1898 uint8_t *frm;
1899 uint16_t capinfo;
1900 int has_challenge, is_shared_key, ret, status;
1901
1902 KASSERT(ni != NULL, ("null node"));
1903
1904 /*
1905 * Hold a reference on the node so it doesn't go away until after
1906 * the xmit is complete all the way in the driver. On error we
1907 * will remove our reference.
1908 */
1909 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
1910 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
1911 __func__, __LINE__,
1912 ni, ether_sprintf(ni->ni_macaddr),
1913 ieee80211_node_refcnt(ni)+1);
1914 ieee80211_ref_node(ni);
1915
1916 memset(¶ms, 0, sizeof(params));
1917 switch (type) {
1918
1919 case IEEE80211_FC0_SUBTYPE_AUTH:
1920 status = arg >> 16;
1921 arg &= 0xffff;
1922 has_challenge = ((arg == IEEE80211_AUTH_SHARED_CHALLENGE ||
1923 arg == IEEE80211_AUTH_SHARED_RESPONSE) &&
1924 ni->ni_challenge != NULL);
1925
1926 /*
1927 * Deduce whether we're doing open authentication or
1928 * shared key authentication. We do the latter if
1929 * we're in the middle of a shared key authentication
1930 * handshake or if we're initiating an authentication
1931 * request and configured to use shared key.
1932 */
1933 is_shared_key = has_challenge ||
1934 arg >= IEEE80211_AUTH_SHARED_RESPONSE ||
1935 (arg == IEEE80211_AUTH_SHARED_REQUEST &&
1936 bss->ni_authmode == IEEE80211_AUTH_SHARED);
1937
1938 m = ieee80211_getmgtframe(&frm,
1939 ic->ic_headroom + sizeof(struct ieee80211_frame),
1940 3 * sizeof(uint16_t)
1941 + (has_challenge && status == IEEE80211_STATUS_SUCCESS ?
1942 sizeof(uint16_t)+IEEE80211_CHALLENGE_LEN : 0)
1943 );
1944 if (m == NULL)
1945 senderr(ENOMEM, is_tx_nobuf);
1946
1947 ((uint16_t *)frm)[0] =
1948 (is_shared_key) ? htole16(IEEE80211_AUTH_ALG_SHARED)
1949 : htole16(IEEE80211_AUTH_ALG_OPEN);
1950 ((uint16_t *)frm)[1] = htole16(arg); /* sequence number */
1951 ((uint16_t *)frm)[2] = htole16(status);/* status */
1952
1953 if (has_challenge && status == IEEE80211_STATUS_SUCCESS) {
1954 ((uint16_t *)frm)[3] =
1955 htole16((IEEE80211_CHALLENGE_LEN << 8) |
1956 IEEE80211_ELEMID_CHALLENGE);
1957 memcpy(&((uint16_t *)frm)[4], ni->ni_challenge,
1958 IEEE80211_CHALLENGE_LEN);
1959 m->m_pkthdr.len = m->m_len =
1960 4 * sizeof(uint16_t) + IEEE80211_CHALLENGE_LEN;
1961 if (arg == IEEE80211_AUTH_SHARED_RESPONSE) {
1962 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1963 "request encrypt frame (%s)", __func__);
1964 /* mark frame for encryption */
1965 params.ibp_flags |= IEEE80211_BPF_CRYPTO;
1966 }
1967 } else
1968 m->m_pkthdr.len = m->m_len = 3 * sizeof(uint16_t);
1969
1970 /* XXX not right for shared key */
1971 if (status == IEEE80211_STATUS_SUCCESS)
1972 IEEE80211_NODE_STAT(ni, tx_auth);
1973 else
1974 IEEE80211_NODE_STAT(ni, tx_auth_fail);
1975
1976 if (vap->iv_opmode == IEEE80211_M_STA)
1977 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
1978 (void *) vap->iv_state);
1979 break;
1980
1981 case IEEE80211_FC0_SUBTYPE_DEAUTH:
1982 IEEE80211_NOTE(vap, IEEE80211_MSG_AUTH, ni,
1983 "send station deauthenticate (reason %d)", arg);
1984 m = ieee80211_getmgtframe(&frm,
1985 ic->ic_headroom + sizeof(struct ieee80211_frame),
1986 sizeof(uint16_t));
1987 if (m == NULL)
1988 senderr(ENOMEM, is_tx_nobuf);
1989 *(uint16_t *)frm = htole16(arg); /* reason */
1990 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
1991
1992 IEEE80211_NODE_STAT(ni, tx_deauth);
1993 IEEE80211_NODE_STAT_SET(ni, tx_deauth_code, arg);
1994
1995 ieee80211_node_unauthorize(ni); /* port closed */
1996 break;
1997
1998 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
1999 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
2000 /*
2001 * asreq frame format
2002 * [2] capability information
2003 * [2] listen interval
2004 * [6*] current AP address (reassoc only)
2005 * [tlv] ssid
2006 * [tlv] supported rates
2007 * [tlv] extended supported rates
2008 * [4] power capability (optional)
2009 * [28] supported channels (optional)
2010 * [tlv] HT capabilities
2011 * [tlv] WME (optional)
2012 * [tlv] Vendor OUI HT capabilities (optional)
2013 * [tlv] Atheros capabilities (if negotiated)
2014 * [tlv] AppIE's (optional)
2015 */
2016 m = ieee80211_getmgtframe(&frm,
2017 ic->ic_headroom + sizeof(struct ieee80211_frame),
2018 sizeof(uint16_t)
2019 + sizeof(uint16_t)
2020 + IEEE80211_ADDR_LEN
2021 + 2 + IEEE80211_NWID_LEN
2022 + 2 + IEEE80211_RATE_SIZE
2023 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2024 + 4
2025 + 2 + 26
2026 + sizeof(struct ieee80211_wme_info)
2027 + sizeof(struct ieee80211_ie_htcap)
2028 + 4 + sizeof(struct ieee80211_ie_htcap)
2029 #ifdef IEEE80211_SUPPORT_SUPERG
2030 + sizeof(struct ieee80211_ath_ie)
2031 #endif
2032 + (vap->iv_appie_wpa != NULL ?
2033 vap->iv_appie_wpa->ie_len : 0)
2034 + (vap->iv_appie_assocreq != NULL ?
2035 vap->iv_appie_assocreq->ie_len : 0)
2036 );
2037 if (m == NULL)
2038 senderr(ENOMEM, is_tx_nobuf);
2039
2040 KASSERT(vap->iv_opmode == IEEE80211_M_STA,
2041 ("wrong mode %u", vap->iv_opmode));
2042 capinfo = IEEE80211_CAPINFO_ESS;
2043 if (vap->iv_flags & IEEE80211_F_PRIVACY)
2044 capinfo |= IEEE80211_CAPINFO_PRIVACY;
2045 /*
2046 * NB: Some 11a AP's reject the request when
2047 * short premable is set.
2048 */
2049 if ((ic->ic_flags & IEEE80211_F_SHPREAMBLE) &&
2050 IEEE80211_IS_CHAN_2GHZ(ic->ic_curchan))
2051 capinfo |= IEEE80211_CAPINFO_SHORT_PREAMBLE;
2052 if (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
2053 (ic->ic_caps & IEEE80211_C_SHSLOT))
2054 capinfo |= IEEE80211_CAPINFO_SHORT_SLOTTIME;
2055 if ((ni->ni_capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) &&
2056 (vap->iv_flags & IEEE80211_F_DOTH))
2057 capinfo |= IEEE80211_CAPINFO_SPECTRUM_MGMT;
2058 *(uint16_t *)frm = htole16(capinfo);
2059 frm += 2;
2060
2061 KASSERT(bss->ni_intval != 0, ("beacon interval is zero!"));
2062 *(uint16_t *)frm = htole16(howmany(ic->ic_lintval,
2063 bss->ni_intval));
2064 frm += 2;
2065
2066 if (type == IEEE80211_FC0_SUBTYPE_REASSOC_REQ) {
2067 IEEE80211_ADDR_COPY(frm, bss->ni_bssid);
2068 frm += IEEE80211_ADDR_LEN;
2069 }
2070
2071 frm = ieee80211_add_ssid(frm, ni->ni_essid, ni->ni_esslen);
2072 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2073 frm = ieee80211_add_rsn(frm, vap);
2074 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2075 if (capinfo & IEEE80211_CAPINFO_SPECTRUM_MGMT) {
2076 frm = ieee80211_add_powercapability(frm,
2077 ic->ic_curchan);
2078 frm = ieee80211_add_supportedchannels(frm, ic);
2079 }
2080 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2081 ni->ni_ies.htcap_ie != NULL &&
2082 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_HTCAP)
2083 frm = ieee80211_add_htcap(frm, ni);
2084 frm = ieee80211_add_wpa(frm, vap);
2085 if ((ic->ic_flags & IEEE80211_F_WME) &&
2086 ni->ni_ies.wme_ie != NULL)
2087 frm = ieee80211_add_wme_info(frm, &ic->ic_wme);
2088 if ((vap->iv_flags_ht & IEEE80211_FHT_HT) &&
2089 ni->ni_ies.htcap_ie != NULL &&
2090 ni->ni_ies.htcap_ie[0] == IEEE80211_ELEMID_VENDOR)
2091 frm = ieee80211_add_htcap_vendor(frm, ni);
2092 #ifdef IEEE80211_SUPPORT_SUPERG
2093 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS)) {
2094 frm = ieee80211_add_ath(frm,
2095 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
2096 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
2097 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
2098 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
2099 }
2100 #endif /* IEEE80211_SUPPORT_SUPERG */
2101 if (vap->iv_appie_assocreq != NULL)
2102 frm = add_appie(frm, vap->iv_appie_assocreq);
2103 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2104
2105 ieee80211_add_callback(m, ieee80211_tx_mgt_cb,
2106 (void *) vap->iv_state);
2107 break;
2108
2109 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
2110 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
2111 /*
2112 * asresp frame format
2113 * [2] capability information
2114 * [2] status
2115 * [2] association ID
2116 * [tlv] supported rates
2117 * [tlv] extended supported rates
2118 * [tlv] HT capabilities (standard, if STA enabled)
2119 * [tlv] HT information (standard, if STA enabled)
2120 * [tlv] WME (if configured and STA enabled)
2121 * [tlv] HT capabilities (vendor OUI, if STA enabled)
2122 * [tlv] HT information (vendor OUI, if STA enabled)
2123 * [tlv] Atheros capabilities (if STA enabled)
2124 * [tlv] AppIE's (optional)
2125 */
2126 m = ieee80211_getmgtframe(&frm,
2127 ic->ic_headroom + sizeof(struct ieee80211_frame),
2128 sizeof(uint16_t)
2129 + sizeof(uint16_t)
2130 + sizeof(uint16_t)
2131 + 2 + IEEE80211_RATE_SIZE
2132 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2133 + sizeof(struct ieee80211_ie_htcap) + 4
2134 + sizeof(struct ieee80211_ie_htinfo) + 4
2135 + sizeof(struct ieee80211_wme_param)
2136 #ifdef IEEE80211_SUPPORT_SUPERG
2137 + sizeof(struct ieee80211_ath_ie)
2138 #endif
2139 + (vap->iv_appie_assocresp != NULL ?
2140 vap->iv_appie_assocresp->ie_len : 0)
2141 );
2142 if (m == NULL)
2143 senderr(ENOMEM, is_tx_nobuf);
2144
2145 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
2146 *(uint16_t *)frm = htole16(capinfo);
2147 frm += 2;
2148
2149 *(uint16_t *)frm = htole16(arg); /* status */
2150 frm += 2;
2151
2152 if (arg == IEEE80211_STATUS_SUCCESS) {
2153 *(uint16_t *)frm = htole16(ni->ni_associd);
2154 IEEE80211_NODE_STAT(ni, tx_assoc);
2155 } else
2156 IEEE80211_NODE_STAT(ni, tx_assoc_fail);
2157 frm += 2;
2158
2159 frm = ieee80211_add_rates(frm, &ni->ni_rates);
2160 frm = ieee80211_add_xrates(frm, &ni->ni_rates);
2161 /* NB: respond according to what we received */
2162 if ((ni->ni_flags & HTFLAGS) == IEEE80211_NODE_HT) {
2163 frm = ieee80211_add_htcap(frm, ni);
2164 frm = ieee80211_add_htinfo(frm, ni);
2165 }
2166 if ((vap->iv_flags & IEEE80211_F_WME) &&
2167 ni->ni_ies.wme_ie != NULL)
2168 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
2169 if ((ni->ni_flags & HTFLAGS) == HTFLAGS) {
2170 frm = ieee80211_add_htcap_vendor(frm, ni);
2171 frm = ieee80211_add_htinfo_vendor(frm, ni);
2172 }
2173 #ifdef IEEE80211_SUPPORT_SUPERG
2174 if (IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS))
2175 frm = ieee80211_add_ath(frm,
2176 IEEE80211_ATH_CAP(vap, ni, IEEE80211_F_ATHEROS),
2177 ((vap->iv_flags & IEEE80211_F_WPA) == 0 &&
2178 ni->ni_authmode != IEEE80211_AUTH_8021X) ?
2179 vap->iv_def_txkey : IEEE80211_KEYIX_NONE);
2180 #endif /* IEEE80211_SUPPORT_SUPERG */
2181 if (vap->iv_appie_assocresp != NULL)
2182 frm = add_appie(frm, vap->iv_appie_assocresp);
2183 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2184 break;
2185
2186 case IEEE80211_FC0_SUBTYPE_DISASSOC:
2187 IEEE80211_NOTE(vap, IEEE80211_MSG_ASSOC, ni,
2188 "send station disassociate (reason %d)", arg);
2189 m = ieee80211_getmgtframe(&frm,
2190 ic->ic_headroom + sizeof(struct ieee80211_frame),
2191 sizeof(uint16_t));
2192 if (m == NULL)
2193 senderr(ENOMEM, is_tx_nobuf);
2194 *(uint16_t *)frm = htole16(arg); /* reason */
2195 m->m_pkthdr.len = m->m_len = sizeof(uint16_t);
2196
2197 IEEE80211_NODE_STAT(ni, tx_disassoc);
2198 IEEE80211_NODE_STAT_SET(ni, tx_disassoc_code, arg);
2199 break;
2200
2201 default:
2202 IEEE80211_NOTE(vap, IEEE80211_MSG_ANY, ni,
2203 "invalid mgmt frame type %u", type);
2204 senderr(EINVAL, is_tx_unknownmgt);
2205 /* NOTREACHED */
2206 }
2207
2208 /* NB: force non-ProbeResp frames to the highest queue */
2209 params.ibp_pri = WME_AC_VO;
2210 params.ibp_rate0 = bss->ni_txparms->mgmtrate;
2211 /* NB: we know all frames are unicast */
2212 params.ibp_try0 = bss->ni_txparms->maxretry;
2213 params.ibp_power = bss->ni_txpower;
2214 return ieee80211_mgmt_output(ni, m, type, ¶ms);
2215 bad:
2216 ieee80211_free_node(ni);
2217 return ret;
2218 #undef senderr
2219 #undef HTFLAGS
2220 }
2221
2222 /*
2223 * Return an mbuf with a probe response frame in it.
2224 * Space is left to prepend and 802.11 header at the
2225 * front but it's left to the caller to fill in.
2226 */
2227 struct mbuf *
2228 ieee80211_alloc_proberesp(struct ieee80211_node *bss, int legacy)
2229 {
2230 struct ieee80211vap *vap = bss->ni_vap;
2231 struct ieee80211com *ic = bss->ni_ic;
2232 const struct ieee80211_rateset *rs;
2233 struct mbuf *m;
2234 uint16_t capinfo;
2235 uint8_t *frm;
2236
2237 /*
2238 * probe response frame format
2239 * [8] time stamp
2240 * [2] beacon interval
2241 * [2] cabability information
2242 * [tlv] ssid
2243 * [tlv] supported rates
2244 * [tlv] parameter set (FH/DS)
2245 * [tlv] parameter set (IBSS)
2246 * [tlv] country (optional)
2247 * [3] power control (optional)
2248 * [5] channel switch announcement (CSA) (optional)
2249 * [tlv] extended rate phy (ERP)
2250 * [tlv] extended supported rates
2251 * [tlv] RSN (optional)
2252 * [tlv] HT capabilities
2253 * [tlv] HT information
2254 * [tlv] WPA (optional)
2255 * [tlv] WME (optional)
2256 * [tlv] Vendor OUI HT capabilities (optional)
2257 * [tlv] Vendor OUI HT information (optional)
2258 * [tlv] Atheros capabilities
2259 * [tlv] AppIE's (optional)
2260 * [tlv] Mesh ID (MBSS)
2261 * [tlv] Mesh Conf (MBSS)
2262 */
2263 m = ieee80211_getmgtframe(&frm,
2264 ic->ic_headroom + sizeof(struct ieee80211_frame),
2265 8
2266 + sizeof(uint16_t)
2267 + sizeof(uint16_t)
2268 + 2 + IEEE80211_NWID_LEN
2269 + 2 + IEEE80211_RATE_SIZE
2270 + 7 /* max(7,3) */
2271 + IEEE80211_COUNTRY_MAX_SIZE
2272 + 3
2273 + sizeof(struct ieee80211_csa_ie)
2274 + 3
2275 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2276 + sizeof(struct ieee80211_ie_wpa)
2277 + sizeof(struct ieee80211_ie_htcap)
2278 + sizeof(struct ieee80211_ie_htinfo)
2279 + sizeof(struct ieee80211_ie_wpa)
2280 + sizeof(struct ieee80211_wme_param)
2281 + 4 + sizeof(struct ieee80211_ie_htcap)
2282 + 4 + sizeof(struct ieee80211_ie_htinfo)
2283 #ifdef IEEE80211_SUPPORT_SUPERG
2284 + sizeof(struct ieee80211_ath_ie)
2285 #endif
2286 #ifdef IEEE80211_SUPPORT_MESH
2287 + 2 + IEEE80211_MESHID_LEN
2288 + sizeof(struct ieee80211_meshconf_ie)
2289 #endif
2290 + (vap->iv_appie_proberesp != NULL ?
2291 vap->iv_appie_proberesp->ie_len : 0)
2292 );
2293 if (m == NULL) {
2294 vap->iv_stats.is_tx_nobuf++;
2295 return NULL;
2296 }
2297
2298 memset(frm, 0, 8); /* timestamp should be filled later */
2299 frm += 8;
2300 *(uint16_t *)frm = htole16(bss->ni_intval);
2301 frm += 2;
2302 capinfo = ieee80211_getcapinfo(vap, bss->ni_chan);
2303 *(uint16_t *)frm = htole16(capinfo);
2304 frm += 2;
2305
2306 frm = ieee80211_add_ssid(frm, bss->ni_essid, bss->ni_esslen);
2307 rs = ieee80211_get_suprates(ic, bss->ni_chan);
2308 frm = ieee80211_add_rates(frm, rs);
2309
2310 if (IEEE80211_IS_CHAN_FHSS(bss->ni_chan)) {
2311 *frm++ = IEEE80211_ELEMID_FHPARMS;
2312 *frm++ = 5;
2313 *frm++ = bss->ni_fhdwell & 0x00ff;
2314 *frm++ = (bss->ni_fhdwell >> 8) & 0x00ff;
2315 *frm++ = IEEE80211_FH_CHANSET(
2316 ieee80211_chan2ieee(ic, bss->ni_chan));
2317 *frm++ = IEEE80211_FH_CHANPAT(
2318 ieee80211_chan2ieee(ic, bss->ni_chan));
2319 *frm++ = bss->ni_fhindex;
2320 } else {
2321 *frm++ = IEEE80211_ELEMID_DSPARMS;
2322 *frm++ = 1;
2323 *frm++ = ieee80211_chan2ieee(ic, bss->ni_chan);
2324 }
2325
2326 if (vap->iv_opmode == IEEE80211_M_IBSS) {
2327 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
2328 *frm++ = 2;
2329 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
2330 }
2331 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
2332 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
2333 frm = ieee80211_add_countryie(frm, ic);
2334 if (vap->iv_flags & IEEE80211_F_DOTH) {
2335 if (IEEE80211_IS_CHAN_5GHZ(bss->ni_chan))
2336 frm = ieee80211_add_powerconstraint(frm, vap);
2337 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
2338 frm = ieee80211_add_csa(frm, vap);
2339 }
2340 if (IEEE80211_IS_CHAN_ANYG(bss->ni_chan))
2341 frm = ieee80211_add_erp(frm, ic);
2342 frm = ieee80211_add_xrates(frm, rs);
2343 frm = ieee80211_add_rsn(frm, vap);
2344 /*
2345 * NB: legacy 11b clients do not get certain ie's.
2346 * The caller identifies such clients by passing
2347 * a token in legacy to us. Could expand this to be
2348 * any legacy client for stuff like HT ie's.
2349 */
2350 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
2351 legacy != IEEE80211_SEND_LEGACY_11B) {
2352 frm = ieee80211_add_htcap(frm, bss);
2353 frm = ieee80211_add_htinfo(frm, bss);
2354 }
2355 frm = ieee80211_add_wpa(frm, vap);
2356 if (vap->iv_flags & IEEE80211_F_WME)
2357 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
2358 if (IEEE80211_IS_CHAN_HT(bss->ni_chan) &&
2359 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT) &&
2360 legacy != IEEE80211_SEND_LEGACY_11B) {
2361 frm = ieee80211_add_htcap_vendor(frm, bss);
2362 frm = ieee80211_add_htinfo_vendor(frm, bss);
2363 }
2364 #ifdef IEEE80211_SUPPORT_SUPERG
2365 if ((vap->iv_flags & IEEE80211_F_ATHEROS) &&
2366 legacy != IEEE80211_SEND_LEGACY_11B)
2367 frm = ieee80211_add_athcaps(frm, bss);
2368 #endif
2369 if (vap->iv_appie_proberesp != NULL)
2370 frm = add_appie(frm, vap->iv_appie_proberesp);
2371 #ifdef IEEE80211_SUPPORT_MESH
2372 if (vap->iv_opmode == IEEE80211_M_MBSS) {
2373 frm = ieee80211_add_meshid(frm, vap);
2374 frm = ieee80211_add_meshconf(frm, vap);
2375 }
2376 #endif
2377 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2378
2379 return m;
2380 }
2381
2382 /*
2383 * Send a probe response frame to the specified mac address.
2384 * This does not go through the normal mgt frame api so we
2385 * can specify the destination address and re-use the bss node
2386 * for the sta reference.
2387 */
2388 int
2389 ieee80211_send_proberesp(struct ieee80211vap *vap,
2390 const uint8_t da[IEEE80211_ADDR_LEN], int legacy)
2391 {
2392 struct ieee80211_node *bss = vap->iv_bss;
2393 struct ieee80211com *ic = vap->iv_ic;
2394 struct ieee80211_frame *wh;
2395 struct mbuf *m;
2396
2397 if (vap->iv_state == IEEE80211_S_CAC) {
2398 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, bss,
2399 "block %s frame in CAC state", "probe response");
2400 vap->iv_stats.is_tx_badstate++;
2401 return EIO; /* XXX */
2402 }
2403
2404 /*
2405 * Hold a reference on the node so it doesn't go away until after
2406 * the xmit is complete all the way in the driver. On error we
2407 * will remove our reference.
2408 */
2409 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
2410 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
2411 __func__, __LINE__, bss, ether_sprintf(bss->ni_macaddr),
2412 ieee80211_node_refcnt(bss)+1);
2413 ieee80211_ref_node(bss);
2414
2415 m = ieee80211_alloc_proberesp(bss, legacy);
2416 if (m == NULL) {
2417 ieee80211_free_node(bss);
2418 return ENOMEM;
2419 }
2420
2421 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
2422 KASSERT(m != NULL, ("no room for header"));
2423
2424 wh = mtod(m, struct ieee80211_frame *);
2425 ieee80211_send_setup(bss, m,
2426 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_PROBE_RESP,
2427 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, bss->ni_bssid);
2428 /* XXX power management? */
2429 m->m_flags |= M_ENCAP; /* mark encapsulated */
2430
2431 M_WME_SETAC(m, WME_AC_BE);
2432
2433 IEEE80211_DPRINTF(vap, IEEE80211_MSG_DEBUG | IEEE80211_MSG_DUMPPKTS,
2434 "send probe resp on channel %u to %s%s\n",
2435 ieee80211_chan2ieee(ic, ic->ic_curchan), ether_sprintf(da),
2436 legacy ? " <legacy>" : "");
2437 IEEE80211_NODE_STAT(bss, tx_mgmt);
2438
2439 return ic->ic_raw_xmit(bss, m, NULL);
2440 }
2441
2442 /*
2443 * Allocate and build a RTS (Request To Send) control frame.
2444 */
2445 struct mbuf *
2446 ieee80211_alloc_rts(struct ieee80211com *ic,
2447 const uint8_t ra[IEEE80211_ADDR_LEN],
2448 const uint8_t ta[IEEE80211_ADDR_LEN],
2449 uint16_t dur)
2450 {
2451 struct ieee80211_frame_rts *rts;
2452 struct mbuf *m;
2453
2454 /* XXX honor ic_headroom */
2455 m = m_gethdr(M_DONTWAIT, MT_DATA);
2456 if (m != NULL) {
2457 rts = mtod(m, struct ieee80211_frame_rts *);
2458 rts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2459 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_RTS;
2460 rts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2461 *(u_int16_t *)rts->i_dur = htole16(dur);
2462 IEEE80211_ADDR_COPY(rts->i_ra, ra);
2463 IEEE80211_ADDR_COPY(rts->i_ta, ta);
2464
2465 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_rts);
2466 }
2467 return m;
2468 }
2469
2470 /*
2471 * Allocate and build a CTS (Clear To Send) control frame.
2472 */
2473 struct mbuf *
2474 ieee80211_alloc_cts(struct ieee80211com *ic,
2475 const uint8_t ra[IEEE80211_ADDR_LEN], uint16_t dur)
2476 {
2477 struct ieee80211_frame_cts *cts;
2478 struct mbuf *m;
2479
2480 /* XXX honor ic_headroom */
2481 m = m_gethdr(M_DONTWAIT, MT_DATA);
2482 if (m != NULL) {
2483 cts = mtod(m, struct ieee80211_frame_cts *);
2484 cts->i_fc[0] = IEEE80211_FC0_VERSION_0 |
2485 IEEE80211_FC0_TYPE_CTL | IEEE80211_FC0_SUBTYPE_CTS;
2486 cts->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2487 *(u_int16_t *)cts->i_dur = htole16(dur);
2488 IEEE80211_ADDR_COPY(cts->i_ra, ra);
2489
2490 m->m_pkthdr.len = m->m_len = sizeof(struct ieee80211_frame_cts);
2491 }
2492 return m;
2493 }
2494
2495 static void
2496 ieee80211_tx_mgt_timeout(void *arg)
2497 {
2498 struct ieee80211_node *ni = arg;
2499 struct ieee80211vap *vap = ni->ni_vap;
2500
2501 if (vap->iv_state != IEEE80211_S_INIT &&
2502 (vap->iv_ic->ic_flags & IEEE80211_F_SCAN) == 0) {
2503 /*
2504 * NB: it's safe to specify a timeout as the reason here;
2505 * it'll only be used in the right state.
2506 */
2507 ieee80211_new_state(vap, IEEE80211_S_SCAN,
2508 IEEE80211_SCAN_FAIL_TIMEOUT);
2509 }
2510 }
2511
2512 static void
2513 ieee80211_tx_mgt_cb(struct ieee80211_node *ni, void *arg, int status)
2514 {
2515 struct ieee80211vap *vap = ni->ni_vap;
2516 enum ieee80211_state ostate = (enum ieee80211_state) arg;
2517
2518 /*
2519 * Frame transmit completed; arrange timer callback. If
2520 * transmit was successfuly we wait for response. Otherwise
2521 * we arrange an immediate callback instead of doing the
2522 * callback directly since we don't know what state the driver
2523 * is in (e.g. what locks it is holding). This work should
2524 * not be too time-critical and not happen too often so the
2525 * added overhead is acceptable.
2526 *
2527 * XXX what happens if !acked but response shows up before callback?
2528 */
2529 if (vap->iv_state == ostate)
2530 callout_reset(&vap->iv_mgtsend,
2531 status == 0 ? IEEE80211_TRANS_WAIT*hz : 0,
2532 ieee80211_tx_mgt_timeout, ni);
2533 }
2534
2535 static void
2536 ieee80211_beacon_construct(struct mbuf *m, uint8_t *frm,
2537 struct ieee80211_beacon_offsets *bo, struct ieee80211_node *ni)
2538 {
2539 struct ieee80211vap *vap = ni->ni_vap;
2540 struct ieee80211com *ic = ni->ni_ic;
2541 struct ieee80211_rateset *rs = &ni->ni_rates;
2542 uint16_t capinfo;
2543
2544 /*
2545 * beacon frame format
2546 * [8] time stamp
2547 * [2] beacon interval
2548 * [2] cabability information
2549 * [tlv] ssid
2550 * [tlv] supported rates
2551 * [3] parameter set (DS)
2552 * [8] CF parameter set (optional)
2553 * [tlv] parameter set (IBSS/TIM)
2554 * [tlv] country (optional)
2555 * [3] power control (optional)
2556 * [5] channel switch announcement (CSA) (optional)
2557 * [tlv] extended rate phy (ERP)
2558 * [tlv] extended supported rates
2559 * [tlv] RSN parameters
2560 * [tlv] HT capabilities
2561 * [tlv] HT information
2562 * XXX Vendor-specific OIDs (e.g. Atheros)
2563 * [tlv] WPA parameters
2564 * [tlv] WME parameters
2565 * [tlv] Vendor OUI HT capabilities (optional)
2566 * [tlv] Vendor OUI HT information (optional)
2567 * [tlv] Atheros capabilities (optional)
2568 * [tlv] TDMA parameters (optional)
2569 * [tlv] Mesh ID (MBSS)
2570 * [tlv] Mesh Conf (MBSS)
2571 * [tlv] application data (optional)
2572 */
2573
2574 memset(bo, 0, sizeof(*bo));
2575
2576 memset(frm, 0, 8); /* XXX timestamp is set by hardware/driver */
2577 frm += 8;
2578 *(uint16_t *)frm = htole16(ni->ni_intval);
2579 frm += 2;
2580 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
2581 bo->bo_caps = (uint16_t *)frm;
2582 *(uint16_t *)frm = htole16(capinfo);
2583 frm += 2;
2584 *frm++ = IEEE80211_ELEMID_SSID;
2585 if ((vap->iv_flags & IEEE80211_F_HIDESSID) == 0) {
2586 *frm++ = ni->ni_esslen;
2587 memcpy(frm, ni->ni_essid, ni->ni_esslen);
2588 frm += ni->ni_esslen;
2589 } else
2590 *frm++ = 0;
2591 frm = ieee80211_add_rates(frm, rs);
2592 if (!IEEE80211_IS_CHAN_FHSS(ni->ni_chan)) {
2593 *frm++ = IEEE80211_ELEMID_DSPARMS;
2594 *frm++ = 1;
2595 *frm++ = ieee80211_chan2ieee(ic, ni->ni_chan);
2596 }
2597 if (ic->ic_flags & IEEE80211_F_PCF) {
2598 bo->bo_cfp = frm;
2599 frm = ieee80211_add_cfparms(frm, ic);
2600 }
2601 bo->bo_tim = frm;
2602 if (vap->iv_opmode == IEEE80211_M_IBSS) {
2603 *frm++ = IEEE80211_ELEMID_IBSSPARMS;
2604 *frm++ = 2;
2605 *frm++ = 0; *frm++ = 0; /* TODO: ATIM window */
2606 bo->bo_tim_len = 0;
2607 } else if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
2608 vap->iv_opmode == IEEE80211_M_MBSS) {
2609 /* TIM IE is the same for Mesh and Hostap */
2610 struct ieee80211_tim_ie *tie = (struct ieee80211_tim_ie *) frm;
2611
2612 tie->tim_ie = IEEE80211_ELEMID_TIM;
2613 tie->tim_len = 4; /* length */
2614 tie->tim_count = 0; /* DTIM count */
2615 tie->tim_period = vap->iv_dtim_period; /* DTIM period */
2616 tie->tim_bitctl = 0; /* bitmap control */
2617 tie->tim_bitmap[0] = 0; /* Partial Virtual Bitmap */
2618 frm += sizeof(struct ieee80211_tim_ie);
2619 bo->bo_tim_len = 1;
2620 }
2621 bo->bo_tim_trailer = frm;
2622 if ((vap->iv_flags & IEEE80211_F_DOTH) ||
2623 (vap->iv_flags_ext & IEEE80211_FEXT_DOTD))
2624 frm = ieee80211_add_countryie(frm, ic);
2625 if (vap->iv_flags & IEEE80211_F_DOTH) {
2626 if (IEEE80211_IS_CHAN_5GHZ(ni->ni_chan))
2627 frm = ieee80211_add_powerconstraint(frm, vap);
2628 bo->bo_csa = frm;
2629 if (ic->ic_flags & IEEE80211_F_CSAPENDING)
2630 frm = ieee80211_add_csa(frm, vap);
2631 } else
2632 bo->bo_csa = frm;
2633 if (IEEE80211_IS_CHAN_ANYG(ni->ni_chan)) {
2634 bo->bo_erp = frm;
2635 frm = ieee80211_add_erp(frm, ic);
2636 }
2637 frm = ieee80211_add_xrates(frm, rs);
2638 frm = ieee80211_add_rsn(frm, vap);
2639 if (IEEE80211_IS_CHAN_HT(ni->ni_chan)) {
2640 frm = ieee80211_add_htcap(frm, ni);
2641 bo->bo_htinfo = frm;
2642 frm = ieee80211_add_htinfo(frm, ni);
2643 }
2644 frm = ieee80211_add_wpa(frm, vap);
2645 if (vap->iv_flags & IEEE80211_F_WME) {
2646 bo->bo_wme = frm;
2647 frm = ieee80211_add_wme_param(frm, &ic->ic_wme);
2648 }
2649 if (IEEE80211_IS_CHAN_HT(ni->ni_chan) &&
2650 (vap->iv_flags_ht & IEEE80211_FHT_HTCOMPAT)) {
2651 frm = ieee80211_add_htcap_vendor(frm, ni);
2652 frm = ieee80211_add_htinfo_vendor(frm, ni);
2653 }
2654 #ifdef IEEE80211_SUPPORT_SUPERG
2655 if (vap->iv_flags & IEEE80211_F_ATHEROS) {
2656 bo->bo_ath = frm;
2657 frm = ieee80211_add_athcaps(frm, ni);
2658 }
2659 #endif
2660 #ifdef IEEE80211_SUPPORT_TDMA
2661 if (vap->iv_caps & IEEE80211_C_TDMA) {
2662 bo->bo_tdma = frm;
2663 frm = ieee80211_add_tdma(frm, vap);
2664 }
2665 #endif
2666 if (vap->iv_appie_beacon != NULL) {
2667 bo->bo_appie = frm;
2668 bo->bo_appie_len = vap->iv_appie_beacon->ie_len;
2669 frm = add_appie(frm, vap->iv_appie_beacon);
2670 }
2671 #ifdef IEEE80211_SUPPORT_MESH
2672 if (vap->iv_opmode == IEEE80211_M_MBSS) {
2673 frm = ieee80211_add_meshid(frm, vap);
2674 bo->bo_meshconf = frm;
2675 frm = ieee80211_add_meshconf(frm, vap);
2676 }
2677 #endif
2678 bo->bo_tim_trailer_len = frm - bo->bo_tim_trailer;
2679 bo->bo_csa_trailer_len = frm - bo->bo_csa;
2680 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
2681 }
2682
2683 /*
2684 * Allocate a beacon frame and fillin the appropriate bits.
2685 */
2686 struct mbuf *
2687 ieee80211_beacon_alloc(struct ieee80211_node *ni,
2688 struct ieee80211_beacon_offsets *bo)
2689 {
2690 struct ieee80211vap *vap = ni->ni_vap;
2691 struct ieee80211com *ic = ni->ni_ic;
2692 struct ifnet *ifp = vap->iv_ifp;
2693 struct ieee80211_frame *wh;
2694 struct mbuf *m;
2695 int pktlen;
2696 uint8_t *frm;
2697
2698 /*
2699 * beacon frame format
2700 * [8] time stamp
2701 * [2] beacon interval
2702 * [2] cabability information
2703 * [tlv] ssid
2704 * [tlv] supported rates
2705 * [3] parameter set (DS)
2706 * [8] CF parameter set (optional)
2707 * [tlv] parameter set (IBSS/TIM)
2708 * [tlv] country (optional)
2709 * [3] power control (optional)
2710 * [5] channel switch announcement (CSA) (optional)
2711 * [tlv] extended rate phy (ERP)
2712 * [tlv] extended supported rates
2713 * [tlv] RSN parameters
2714 * [tlv] HT capabilities
2715 * [tlv] HT information
2716 * [tlv] Vendor OUI HT capabilities (optional)
2717 * [tlv] Vendor OUI HT information (optional)
2718 * XXX Vendor-specific OIDs (e.g. Atheros)
2719 * [tlv] WPA parameters
2720 * [tlv] WME parameters
2721 * [tlv] TDMA parameters (optional)
2722 * [tlv] Mesh ID (MBSS)
2723 * [tlv] Mesh Conf (MBSS)
2724 * [tlv] application data (optional)
2725 * NB: we allocate the max space required for the TIM bitmap.
2726 * XXX how big is this?
2727 */
2728 pktlen = 8 /* time stamp */
2729 + sizeof(uint16_t) /* beacon interval */
2730 + sizeof(uint16_t) /* capabilities */
2731 + 2 + ni->ni_esslen /* ssid */
2732 + 2 + IEEE80211_RATE_SIZE /* supported rates */
2733 + 2 + 1 /* DS parameters */
2734 + 2 + 6 /* CF parameters */
2735 + 2 + 4 + vap->iv_tim_len /* DTIM/IBSSPARMS */
2736 + IEEE80211_COUNTRY_MAX_SIZE /* country */
2737 + 2 + 1 /* power control */
2738 + sizeof(struct ieee80211_csa_ie) /* CSA */
2739 + 2 + 1 /* ERP */
2740 + 2 + (IEEE80211_RATE_MAXSIZE - IEEE80211_RATE_SIZE)
2741 + (vap->iv_caps & IEEE80211_C_WPA ? /* WPA 1+2 */
2742 2*sizeof(struct ieee80211_ie_wpa) : 0)
2743 /* XXX conditional? */
2744 + 4+2*sizeof(struct ieee80211_ie_htcap)/* HT caps */
2745 + 4+2*sizeof(struct ieee80211_ie_htinfo)/* HT info */
2746 + (vap->iv_caps & IEEE80211_C_WME ? /* WME */
2747 sizeof(struct ieee80211_wme_param) : 0)
2748 #ifdef IEEE80211_SUPPORT_SUPERG
2749 + sizeof(struct ieee80211_ath_ie) /* ATH */
2750 #endif
2751 #ifdef IEEE80211_SUPPORT_TDMA
2752 + (vap->iv_caps & IEEE80211_C_TDMA ? /* TDMA */
2753 sizeof(struct ieee80211_tdma_param) : 0)
2754 #endif
2755 #ifdef IEEE80211_SUPPORT_MESH
2756 + 2 + ni->ni_meshidlen
2757 + sizeof(struct ieee80211_meshconf_ie)
2758 #endif
2759 + IEEE80211_MAX_APPIE
2760 ;
2761 m = ieee80211_getmgtframe(&frm,
2762 ic->ic_headroom + sizeof(struct ieee80211_frame), pktlen);
2763 if (m == NULL) {
2764 IEEE80211_DPRINTF(vap, IEEE80211_MSG_ANY,
2765 "%s: cannot get buf; size %u\n", __func__, pktlen);
2766 vap->iv_stats.is_tx_nobuf++;
2767 return NULL;
2768 }
2769 ieee80211_beacon_construct(m, frm, bo, ni);
2770
2771 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
2772 KASSERT(m != NULL, ("no space for 802.11 header?"));
2773 wh = mtod(m, struct ieee80211_frame *);
2774 wh->i_fc[0] = IEEE80211_FC0_VERSION_0 | IEEE80211_FC0_TYPE_MGT |
2775 IEEE80211_FC0_SUBTYPE_BEACON;
2776 wh->i_fc[1] = IEEE80211_FC1_DIR_NODS;
2777 *(uint16_t *)wh->i_dur = 0;
2778 IEEE80211_ADDR_COPY(wh->i_addr1, ifp->if_broadcastaddr);
2779 IEEE80211_ADDR_COPY(wh->i_addr2, vap->iv_myaddr);
2780 IEEE80211_ADDR_COPY(wh->i_addr3, ni->ni_bssid);
2781 *(uint16_t *)wh->i_seq = 0;
2782
2783 return m;
2784 }
2785
2786 /*
2787 * Update the dynamic parts of a beacon frame based on the current state.
2788 */
2789 int
2790 ieee80211_beacon_update(struct ieee80211_node *ni,
2791 struct ieee80211_beacon_offsets *bo, struct mbuf *m, int mcast)
2792 {
2793 struct ieee80211vap *vap = ni->ni_vap;
2794 struct ieee80211com *ic = ni->ni_ic;
2795 int len_changed = 0;
2796 uint16_t capinfo;
2797 struct ieee80211_frame *wh;
2798 ieee80211_seq seqno;
2799
2800 IEEE80211_LOCK(ic);
2801 /*
2802 * Handle 11h channel change when we've reached the count.
2803 * We must recalculate the beacon frame contents to account
2804 * for the new channel. Note we do this only for the first
2805 * vap that reaches this point; subsequent vaps just update
2806 * their beacon state to reflect the recalculated channel.
2807 */
2808 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA) &&
2809 vap->iv_csa_count == ic->ic_csa_count) {
2810 vap->iv_csa_count = 0;
2811 /*
2812 * Effect channel change before reconstructing the beacon
2813 * frame contents as many places reference ni_chan.
2814 */
2815 if (ic->ic_csa_newchan != NULL)
2816 ieee80211_csa_completeswitch(ic);
2817 /*
2818 * NB: ieee80211_beacon_construct clears all pending
2819 * updates in bo_flags so we don't need to explicitly
2820 * clear IEEE80211_BEACON_CSA.
2821 */
2822 ieee80211_beacon_construct(m,
2823 mtod(m, uint8_t*) + sizeof(struct ieee80211_frame), bo, ni);
2824
2825 /* XXX do WME aggressive mode processing? */
2826 IEEE80211_UNLOCK(ic);
2827 return 1; /* just assume length changed */
2828 }
2829
2830 wh = mtod(m, struct ieee80211_frame *);
2831 seqno = ni->ni_txseqs[IEEE80211_NONQOS_TID]++;
2832 *(uint16_t *)&wh->i_seq[0] =
2833 htole16(seqno << IEEE80211_SEQ_SEQ_SHIFT);
2834 M_SEQNO_SET(m, seqno);
2835
2836 /* XXX faster to recalculate entirely or just changes? */
2837 capinfo = ieee80211_getcapinfo(vap, ni->ni_chan);
2838 *bo->bo_caps = htole16(capinfo);
2839
2840 if (vap->iv_flags & IEEE80211_F_WME) {
2841 struct ieee80211_wme_state *wme = &ic->ic_wme;
2842
2843 /*
2844 * Check for agressive mode change. When there is
2845 * significant high priority traffic in the BSS
2846 * throttle back BE traffic by using conservative
2847 * parameters. Otherwise BE uses agressive params
2848 * to optimize performance of legacy/non-QoS traffic.
2849 */
2850 if (wme->wme_flags & WME_F_AGGRMODE) {
2851 if (wme->wme_hipri_traffic >
2852 wme->wme_hipri_switch_thresh) {
2853 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
2854 "%s: traffic %u, disable aggressive mode\n",
2855 __func__, wme->wme_hipri_traffic);
2856 wme->wme_flags &= ~WME_F_AGGRMODE;
2857 ieee80211_wme_updateparams_locked(vap);
2858 wme->wme_hipri_traffic =
2859 wme->wme_hipri_switch_hysteresis;
2860 } else
2861 wme->wme_hipri_traffic = 0;
2862 } else {
2863 if (wme->wme_hipri_traffic <=
2864 wme->wme_hipri_switch_thresh) {
2865 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
2866 "%s: traffic %u, enable aggressive mode\n",
2867 __func__, wme->wme_hipri_traffic);
2868 wme->wme_flags |= WME_F_AGGRMODE;
2869 ieee80211_wme_updateparams_locked(vap);
2870 wme->wme_hipri_traffic = 0;
2871 } else
2872 wme->wme_hipri_traffic =
2873 wme->wme_hipri_switch_hysteresis;
2874 }
2875 if (isset(bo->bo_flags, IEEE80211_BEACON_WME)) {
2876 (void) ieee80211_add_wme_param(bo->bo_wme, wme);
2877 clrbit(bo->bo_flags, IEEE80211_BEACON_WME);
2878 }
2879 }
2880
2881 if (isset(bo->bo_flags, IEEE80211_BEACON_HTINFO)) {
2882 ieee80211_ht_update_beacon(vap, bo);
2883 clrbit(bo->bo_flags, IEEE80211_BEACON_HTINFO);
2884 }
2885 #ifdef IEEE80211_SUPPORT_TDMA
2886 if (vap->iv_caps & IEEE80211_C_TDMA) {
2887 /*
2888 * NB: the beacon is potentially updated every TBTT.
2889 */
2890 ieee80211_tdma_update_beacon(vap, bo);
2891 }
2892 #endif
2893 #ifdef IEEE80211_SUPPORT_MESH
2894 if (vap->iv_opmode == IEEE80211_M_MBSS)
2895 ieee80211_mesh_update_beacon(vap, bo);
2896 #endif
2897
2898 if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
2899 vap->iv_opmode == IEEE80211_M_MBSS) { /* NB: no IBSS support*/
2900 struct ieee80211_tim_ie *tie =
2901 (struct ieee80211_tim_ie *) bo->bo_tim;
2902 if (isset(bo->bo_flags, IEEE80211_BEACON_TIM)) {
2903 u_int timlen, timoff, i;
2904 /*
2905 * ATIM/DTIM needs updating. If it fits in the
2906 * current space allocated then just copy in the
2907 * new bits. Otherwise we need to move any trailing
2908 * data to make room. Note that we know there is
2909 * contiguous space because ieee80211_beacon_allocate
2910 * insures there is space in the mbuf to write a
2911 * maximal-size virtual bitmap (based on iv_max_aid).
2912 */
2913 /*
2914 * Calculate the bitmap size and offset, copy any
2915 * trailer out of the way, and then copy in the
2916 * new bitmap and update the information element.
2917 * Note that the tim bitmap must contain at least
2918 * one byte and any offset must be even.
2919 */
2920 if (vap->iv_ps_pending != 0) {
2921 timoff = 128; /* impossibly large */
2922 for (i = 0; i < vap->iv_tim_len; i++)
2923 if (vap->iv_tim_bitmap[i]) {
2924 timoff = i &~ 1;
2925 break;
2926 }
2927 KASSERT(timoff != 128, ("tim bitmap empty!"));
2928 for (i = vap->iv_tim_len-1; i >= timoff; i--)
2929 if (vap->iv_tim_bitmap[i])
2930 break;
2931 timlen = 1 + (i - timoff);
2932 } else {
2933 timoff = 0;
2934 timlen = 1;
2935 }
2936 if (timlen != bo->bo_tim_len) {
2937 /* copy up/down trailer */
2938 int adjust = tie->tim_bitmap+timlen
2939 - bo->bo_tim_trailer;
2940 ovbcopy(bo->bo_tim_trailer,
2941 bo->bo_tim_trailer+adjust,
2942 bo->bo_tim_trailer_len);
2943 bo->bo_tim_trailer += adjust;
2944 bo->bo_erp += adjust;
2945 bo->bo_htinfo += adjust;
2946 #ifdef IEEE80211_SUPPORT_SUPERG
2947 bo->bo_ath += adjust;
2948 #endif
2949 #ifdef IEEE80211_SUPPORT_TDMA
2950 bo->bo_tdma += adjust;
2951 #endif
2952 #ifdef IEEE80211_SUPPORT_MESH
2953 bo->bo_meshconf += adjust;
2954 #endif
2955 bo->bo_appie += adjust;
2956 bo->bo_wme += adjust;
2957 bo->bo_csa += adjust;
2958 bo->bo_tim_len = timlen;
2959
2960 /* update information element */
2961 tie->tim_len = 3 + timlen;
2962 tie->tim_bitctl = timoff;
2963 len_changed = 1;
2964 }
2965 memcpy(tie->tim_bitmap, vap->iv_tim_bitmap + timoff,
2966 bo->bo_tim_len);
2967
2968 clrbit(bo->bo_flags, IEEE80211_BEACON_TIM);
2969
2970 IEEE80211_DPRINTF(vap, IEEE80211_MSG_POWER,
2971 "%s: TIM updated, pending %u, off %u, len %u\n",
2972 __func__, vap->iv_ps_pending, timoff, timlen);
2973 }
2974 /* count down DTIM period */
2975 if (tie->tim_count == 0)
2976 tie->tim_count = tie->tim_period - 1;
2977 else
2978 tie->tim_count--;
2979 /* update state for buffered multicast frames on DTIM */
2980 if (mcast && tie->tim_count == 0)
2981 tie->tim_bitctl |= 1;
2982 else
2983 tie->tim_bitctl &= ~1;
2984 if (isset(bo->bo_flags, IEEE80211_BEACON_CSA)) {
2985 struct ieee80211_csa_ie *csa =
2986 (struct ieee80211_csa_ie *) bo->bo_csa;
2987
2988 /*
2989 * Insert or update CSA ie. If we're just starting
2990 * to count down to the channel switch then we need
2991 * to insert the CSA ie. Otherwise we just need to
2992 * drop the count. The actual change happens above
2993 * when the vap's count reaches the target count.
2994 */
2995 if (vap->iv_csa_count == 0) {
2996 memmove(&csa[1], csa, bo->bo_csa_trailer_len);
2997 bo->bo_erp += sizeof(*csa);
2998 bo->bo_htinfo += sizeof(*csa);
2999 bo->bo_wme += sizeof(*csa);
3000 #ifdef IEEE80211_SUPPORT_SUPERG
3001 bo->bo_ath += sizeof(*csa);
3002 #endif
3003 #ifdef IEEE80211_SUPPORT_TDMA
3004 bo->bo_tdma += sizeof(*csa);
3005 #endif
3006 #ifdef IEEE80211_SUPPORT_MESH
3007 bo->bo_meshconf += sizeof(*csa);
3008 #endif
3009 bo->bo_appie += sizeof(*csa);
3010 bo->bo_csa_trailer_len += sizeof(*csa);
3011 bo->bo_tim_trailer_len += sizeof(*csa);
3012 m->m_len += sizeof(*csa);
3013 m->m_pkthdr.len += sizeof(*csa);
3014
3015 ieee80211_add_csa(bo->bo_csa, vap);
3016 } else
3017 csa->csa_count--;
3018 vap->iv_csa_count++;
3019 /* NB: don't clear IEEE80211_BEACON_CSA */
3020 }
3021 if (isset(bo->bo_flags, IEEE80211_BEACON_ERP)) {
3022 /*
3023 * ERP element needs updating.
3024 */
3025 (void) ieee80211_add_erp(bo->bo_erp, ic);
3026 clrbit(bo->bo_flags, IEEE80211_BEACON_ERP);
3027 }
3028 #ifdef IEEE80211_SUPPORT_SUPERG
3029 if (isset(bo->bo_flags, IEEE80211_BEACON_ATH)) {
3030 ieee80211_add_athcaps(bo->bo_ath, ni);
3031 clrbit(bo->bo_flags, IEEE80211_BEACON_ATH);
3032 }
3033 #endif
3034 }
3035 if (isset(bo->bo_flags, IEEE80211_BEACON_APPIE)) {
3036 const struct ieee80211_appie *aie = vap->iv_appie_beacon;
3037 int aielen;
3038 uint8_t *frm;
3039
3040 aielen = 0;
3041 if (aie != NULL)
3042 aielen += aie->ie_len;
3043 if (aielen != bo->bo_appie_len) {
3044 /* copy up/down trailer */
3045 int adjust = aielen - bo->bo_appie_len;
3046 ovbcopy(bo->bo_tim_trailer, bo->bo_tim_trailer+adjust,
3047 bo->bo_tim_trailer_len);
3048 bo->bo_tim_trailer += adjust;
3049 bo->bo_appie += adjust;
3050 bo->bo_appie_len = aielen;
3051
3052 len_changed = 1;
3053 }
3054 frm = bo->bo_appie;
3055 if (aie != NULL)
3056 frm = add_appie(frm, aie);
3057 clrbit(bo->bo_flags, IEEE80211_BEACON_APPIE);
3058 }
3059 IEEE80211_UNLOCK(ic);
3060
3061 return len_changed;
3062 }
Cache object: a0f877bd109177a9ee41d5b46cfc2bf4
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