1 /*-
2 * Copyright (c) 2001 Atsushi Onoe
3 * Copyright (c) 2002-2008 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 /*
31 * IEEE 802.11 protocol support.
32 */
33
34 #include "opt_inet.h"
35 #include "opt_wlan.h"
36
37 #include <sys/param.h>
38 #include <sys/kernel.h>
39 #include <sys/systm.h>
40
41 #include <sys/socket.h>
42 #include <sys/sockio.h>
43
44 #include <net/if.h>
45 #include <net/if_media.h>
46 #include <net/ethernet.h> /* XXX for ether_sprintf */
47
48 #include <net80211/ieee80211_var.h>
49 #include <net80211/ieee80211_adhoc.h>
50 #include <net80211/ieee80211_sta.h>
51 #include <net80211/ieee80211_hostap.h>
52 #include <net80211/ieee80211_wds.h>
53 #ifdef IEEE80211_SUPPORT_MESH
54 #include <net80211/ieee80211_mesh.h>
55 #endif
56 #include <net80211/ieee80211_monitor.h>
57 #include <net80211/ieee80211_input.h>
58
59 /* XXX tunables */
60 #define AGGRESSIVE_MODE_SWITCH_HYSTERESIS 3 /* pkts / 100ms */
61 #define HIGH_PRI_SWITCH_THRESH 10 /* pkts / 100ms */
62
63 const char *ieee80211_mgt_subtype_name[] = {
64 "assoc_req", "assoc_resp", "reassoc_req", "reassoc_resp",
65 "probe_req", "probe_resp", "reserved#6", "reserved#7",
66 "beacon", "atim", "disassoc", "auth",
67 "deauth", "action", "action_noack", "reserved#15"
68 };
69 const char *ieee80211_ctl_subtype_name[] = {
70 "reserved#0", "reserved#1", "reserved#2", "reserved#3",
71 "reserved#3", "reserved#5", "reserved#6", "reserved#7",
72 "reserved#8", "reserved#9", "ps_poll", "rts",
73 "cts", "ack", "cf_end", "cf_end_ack"
74 };
75 const char *ieee80211_opmode_name[IEEE80211_OPMODE_MAX] = {
76 "IBSS", /* IEEE80211_M_IBSS */
77 "STA", /* IEEE80211_M_STA */
78 "WDS", /* IEEE80211_M_WDS */
79 "AHDEMO", /* IEEE80211_M_AHDEMO */
80 "HOSTAP", /* IEEE80211_M_HOSTAP */
81 "MONITOR", /* IEEE80211_M_MONITOR */
82 "MBSS" /* IEEE80211_M_MBSS */
83 };
84 const char *ieee80211_state_name[IEEE80211_S_MAX] = {
85 "INIT", /* IEEE80211_S_INIT */
86 "SCAN", /* IEEE80211_S_SCAN */
87 "AUTH", /* IEEE80211_S_AUTH */
88 "ASSOC", /* IEEE80211_S_ASSOC */
89 "CAC", /* IEEE80211_S_CAC */
90 "RUN", /* IEEE80211_S_RUN */
91 "CSA", /* IEEE80211_S_CSA */
92 "SLEEP", /* IEEE80211_S_SLEEP */
93 };
94 const char *ieee80211_wme_acnames[] = {
95 "WME_AC_BE",
96 "WME_AC_BK",
97 "WME_AC_VI",
98 "WME_AC_VO",
99 "WME_UPSD",
100 };
101
102 static void beacon_miss(void *, int);
103 static void beacon_swmiss(void *, int);
104 static void parent_updown(void *, int);
105 static void update_mcast(void *, int);
106 static void update_promisc(void *, int);
107 static void update_channel(void *, int);
108 static void update_chw(void *, int);
109 static void ieee80211_newstate_cb(void *, int);
110
111 static int
null_raw_xmit(struct ieee80211_node * ni,struct mbuf * m,const struct ieee80211_bpf_params * params)112 null_raw_xmit(struct ieee80211_node *ni, struct mbuf *m,
113 const struct ieee80211_bpf_params *params)
114 {
115 struct ifnet *ifp = ni->ni_ic->ic_ifp;
116
117 if_printf(ifp, "missing ic_raw_xmit callback, drop frame\n");
118 m_freem(m);
119 return ENETDOWN;
120 }
121
122 void
ieee80211_proto_attach(struct ieee80211com * ic)123 ieee80211_proto_attach(struct ieee80211com *ic)
124 {
125 struct ifnet *ifp = ic->ic_ifp;
126
127 /* override the 802.3 setting */
128 ifp->if_hdrlen = ic->ic_headroom
129 + sizeof(struct ieee80211_qosframe_addr4)
130 + IEEE80211_WEP_IVLEN + IEEE80211_WEP_KIDLEN
131 + IEEE80211_WEP_EXTIVLEN;
132 /* XXX no way to recalculate on ifdetach */
133 if (ALIGN(ifp->if_hdrlen) > max_linkhdr) {
134 /* XXX sanity check... */
135 max_linkhdr = ALIGN(ifp->if_hdrlen);
136 max_hdr = max_linkhdr + max_protohdr;
137 max_datalen = MHLEN - max_hdr;
138 }
139 ic->ic_protmode = IEEE80211_PROT_CTSONLY;
140
141 TASK_INIT(&ic->ic_parent_task, 0, parent_updown, ifp);
142 TASK_INIT(&ic->ic_mcast_task, 0, update_mcast, ic);
143 TASK_INIT(&ic->ic_promisc_task, 0, update_promisc, ic);
144 TASK_INIT(&ic->ic_chan_task, 0, update_channel, ic);
145 TASK_INIT(&ic->ic_bmiss_task, 0, beacon_miss, ic);
146 TASK_INIT(&ic->ic_chw_task, 0, update_chw, ic);
147
148 ic->ic_wme.wme_hipri_switch_hysteresis =
149 AGGRESSIVE_MODE_SWITCH_HYSTERESIS;
150
151 /* initialize management frame handlers */
152 ic->ic_send_mgmt = ieee80211_send_mgmt;
153 ic->ic_raw_xmit = null_raw_xmit;
154
155 ieee80211_adhoc_attach(ic);
156 ieee80211_sta_attach(ic);
157 ieee80211_wds_attach(ic);
158 ieee80211_hostap_attach(ic);
159 #ifdef IEEE80211_SUPPORT_MESH
160 ieee80211_mesh_attach(ic);
161 #endif
162 ieee80211_monitor_attach(ic);
163 }
164
165 void
ieee80211_proto_detach(struct ieee80211com * ic)166 ieee80211_proto_detach(struct ieee80211com *ic)
167 {
168 ieee80211_monitor_detach(ic);
169 #ifdef IEEE80211_SUPPORT_MESH
170 ieee80211_mesh_detach(ic);
171 #endif
172 ieee80211_hostap_detach(ic);
173 ieee80211_wds_detach(ic);
174 ieee80211_adhoc_detach(ic);
175 ieee80211_sta_detach(ic);
176 }
177
178 static void
null_update_beacon(struct ieee80211vap * vap,int item)179 null_update_beacon(struct ieee80211vap *vap, int item)
180 {
181 }
182
183 void
ieee80211_proto_vattach(struct ieee80211vap * vap)184 ieee80211_proto_vattach(struct ieee80211vap *vap)
185 {
186 struct ieee80211com *ic = vap->iv_ic;
187 struct ifnet *ifp = vap->iv_ifp;
188 int i;
189
190 /* override the 802.3 setting */
191 ifp->if_hdrlen = ic->ic_ifp->if_hdrlen;
192
193 vap->iv_rtsthreshold = IEEE80211_RTS_DEFAULT;
194 vap->iv_fragthreshold = IEEE80211_FRAG_DEFAULT;
195 vap->iv_bmiss_max = IEEE80211_BMISS_MAX;
196 callout_init_mtx(&vap->iv_swbmiss, IEEE80211_LOCK_OBJ(ic), 0);
197 callout_init(&vap->iv_mgtsend, CALLOUT_MPSAFE);
198 TASK_INIT(&vap->iv_nstate_task, 0, ieee80211_newstate_cb, vap);
199 TASK_INIT(&vap->iv_swbmiss_task, 0, beacon_swmiss, vap);
200 /*
201 * Install default tx rate handling: no fixed rate, lowest
202 * supported rate for mgmt and multicast frames. Default
203 * max retry count. These settings can be changed by the
204 * driver and/or user applications.
205 */
206 for (i = IEEE80211_MODE_11A; i < IEEE80211_MODE_MAX; i++) {
207 const struct ieee80211_rateset *rs = &ic->ic_sup_rates[i];
208
209 vap->iv_txparms[i].ucastrate = IEEE80211_FIXED_RATE_NONE;
210
211 /*
212 * Setting the management rate to MCS 0 assumes that the
213 * BSS Basic rate set is empty and the BSS Basic MCS set
214 * is not.
215 *
216 * Since we're not checking this, default to the lowest
217 * defined rate for this mode.
218 *
219 * At least one 11n AP (DLINK DIR-825) is reported to drop
220 * some MCS management traffic (eg BA response frames.)
221 *
222 * See also: 9.6.0 of the 802.11n-2009 specification.
223 */
224 #ifdef NOTYET
225 if (i == IEEE80211_MODE_11NA || i == IEEE80211_MODE_11NG) {
226 vap->iv_txparms[i].mgmtrate = 0 | IEEE80211_RATE_MCS;
227 vap->iv_txparms[i].mcastrate = 0 | IEEE80211_RATE_MCS;
228 } else {
229 vap->iv_txparms[i].mgmtrate =
230 rs->rs_rates[0] & IEEE80211_RATE_VAL;
231 vap->iv_txparms[i].mcastrate =
232 rs->rs_rates[0] & IEEE80211_RATE_VAL;
233 }
234 #endif
235 vap->iv_txparms[i].mgmtrate = rs->rs_rates[0] & IEEE80211_RATE_VAL;
236 vap->iv_txparms[i].mcastrate = rs->rs_rates[0] & IEEE80211_RATE_VAL;
237 vap->iv_txparms[i].maxretry = IEEE80211_TXMAX_DEFAULT;
238 }
239 vap->iv_roaming = IEEE80211_ROAMING_AUTO;
240
241 vap->iv_update_beacon = null_update_beacon;
242 vap->iv_deliver_data = ieee80211_deliver_data;
243
244 /* attach support for operating mode */
245 ic->ic_vattach[vap->iv_opmode](vap);
246 }
247
248 void
ieee80211_proto_vdetach(struct ieee80211vap * vap)249 ieee80211_proto_vdetach(struct ieee80211vap *vap)
250 {
251 #define FREEAPPIE(ie) do { \
252 if (ie != NULL) \
253 free(ie, M_80211_NODE_IE); \
254 } while (0)
255 /*
256 * Detach operating mode module.
257 */
258 if (vap->iv_opdetach != NULL)
259 vap->iv_opdetach(vap);
260 /*
261 * This should not be needed as we detach when reseting
262 * the state but be conservative here since the
263 * authenticator may do things like spawn kernel threads.
264 */
265 if (vap->iv_auth->ia_detach != NULL)
266 vap->iv_auth->ia_detach(vap);
267 /*
268 * Detach any ACL'ator.
269 */
270 if (vap->iv_acl != NULL)
271 vap->iv_acl->iac_detach(vap);
272
273 FREEAPPIE(vap->iv_appie_beacon);
274 FREEAPPIE(vap->iv_appie_probereq);
275 FREEAPPIE(vap->iv_appie_proberesp);
276 FREEAPPIE(vap->iv_appie_assocreq);
277 FREEAPPIE(vap->iv_appie_assocresp);
278 FREEAPPIE(vap->iv_appie_wpa);
279 #undef FREEAPPIE
280 }
281
282 /*
283 * Simple-minded authenticator module support.
284 */
285
286 #define IEEE80211_AUTH_MAX (IEEE80211_AUTH_WPA+1)
287 /* XXX well-known names */
288 static const char *auth_modnames[IEEE80211_AUTH_MAX] = {
289 "wlan_internal", /* IEEE80211_AUTH_NONE */
290 "wlan_internal", /* IEEE80211_AUTH_OPEN */
291 "wlan_internal", /* IEEE80211_AUTH_SHARED */
292 "wlan_xauth", /* IEEE80211_AUTH_8021X */
293 "wlan_internal", /* IEEE80211_AUTH_AUTO */
294 "wlan_xauth", /* IEEE80211_AUTH_WPA */
295 };
296 static const struct ieee80211_authenticator *authenticators[IEEE80211_AUTH_MAX];
297
298 static const struct ieee80211_authenticator auth_internal = {
299 .ia_name = "wlan_internal",
300 .ia_attach = NULL,
301 .ia_detach = NULL,
302 .ia_node_join = NULL,
303 .ia_node_leave = NULL,
304 };
305
306 /*
307 * Setup internal authenticators once; they are never unregistered.
308 */
309 static void
ieee80211_auth_setup(void)310 ieee80211_auth_setup(void)
311 {
312 ieee80211_authenticator_register(IEEE80211_AUTH_OPEN, &auth_internal);
313 ieee80211_authenticator_register(IEEE80211_AUTH_SHARED, &auth_internal);
314 ieee80211_authenticator_register(IEEE80211_AUTH_AUTO, &auth_internal);
315 }
316 SYSINIT(wlan_auth, SI_SUB_DRIVERS, SI_ORDER_FIRST, ieee80211_auth_setup, NULL);
317
318 const struct ieee80211_authenticator *
ieee80211_authenticator_get(int auth)319 ieee80211_authenticator_get(int auth)
320 {
321 if (auth >= IEEE80211_AUTH_MAX)
322 return NULL;
323 if (authenticators[auth] == NULL)
324 ieee80211_load_module(auth_modnames[auth]);
325 return authenticators[auth];
326 }
327
328 void
ieee80211_authenticator_register(int type,const struct ieee80211_authenticator * auth)329 ieee80211_authenticator_register(int type,
330 const struct ieee80211_authenticator *auth)
331 {
332 if (type >= IEEE80211_AUTH_MAX)
333 return;
334 authenticators[type] = auth;
335 }
336
337 void
ieee80211_authenticator_unregister(int type)338 ieee80211_authenticator_unregister(int type)
339 {
340
341 if (type >= IEEE80211_AUTH_MAX)
342 return;
343 authenticators[type] = NULL;
344 }
345
346 /*
347 * Very simple-minded ACL module support.
348 */
349 /* XXX just one for now */
350 static const struct ieee80211_aclator *acl = NULL;
351
352 void
ieee80211_aclator_register(const struct ieee80211_aclator * iac)353 ieee80211_aclator_register(const struct ieee80211_aclator *iac)
354 {
355 printf("wlan: %s acl policy registered\n", iac->iac_name);
356 acl = iac;
357 }
358
359 void
ieee80211_aclator_unregister(const struct ieee80211_aclator * iac)360 ieee80211_aclator_unregister(const struct ieee80211_aclator *iac)
361 {
362 if (acl == iac)
363 acl = NULL;
364 printf("wlan: %s acl policy unregistered\n", iac->iac_name);
365 }
366
367 const struct ieee80211_aclator *
ieee80211_aclator_get(const char * name)368 ieee80211_aclator_get(const char *name)
369 {
370 if (acl == NULL)
371 ieee80211_load_module("wlan_acl");
372 return acl != NULL && strcmp(acl->iac_name, name) == 0 ? acl : NULL;
373 }
374
375 void
ieee80211_print_essid(const uint8_t * essid,int len)376 ieee80211_print_essid(const uint8_t *essid, int len)
377 {
378 const uint8_t *p;
379 int i;
380
381 if (len > IEEE80211_NWID_LEN)
382 len = IEEE80211_NWID_LEN;
383 /* determine printable or not */
384 for (i = 0, p = essid; i < len; i++, p++) {
385 if (*p < ' ' || *p > 0x7e)
386 break;
387 }
388 if (i == len) {
389 printf("\"");
390 for (i = 0, p = essid; i < len; i++, p++)
391 printf("%c", *p);
392 printf("\"");
393 } else {
394 printf("0x");
395 for (i = 0, p = essid; i < len; i++, p++)
396 printf("%02x", *p);
397 }
398 }
399
400 void
ieee80211_dump_pkt(struct ieee80211com * ic,const uint8_t * buf,int len,int rate,int rssi)401 ieee80211_dump_pkt(struct ieee80211com *ic,
402 const uint8_t *buf, int len, int rate, int rssi)
403 {
404 const struct ieee80211_frame *wh;
405 int i;
406
407 wh = (const struct ieee80211_frame *)buf;
408 switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
409 case IEEE80211_FC1_DIR_NODS:
410 printf("NODS %s", ether_sprintf(wh->i_addr2));
411 printf("->%s", ether_sprintf(wh->i_addr1));
412 printf("(%s)", ether_sprintf(wh->i_addr3));
413 break;
414 case IEEE80211_FC1_DIR_TODS:
415 printf("TODS %s", ether_sprintf(wh->i_addr2));
416 printf("->%s", ether_sprintf(wh->i_addr3));
417 printf("(%s)", ether_sprintf(wh->i_addr1));
418 break;
419 case IEEE80211_FC1_DIR_FROMDS:
420 printf("FRDS %s", ether_sprintf(wh->i_addr3));
421 printf("->%s", ether_sprintf(wh->i_addr1));
422 printf("(%s)", ether_sprintf(wh->i_addr2));
423 break;
424 case IEEE80211_FC1_DIR_DSTODS:
425 printf("DSDS %s", ether_sprintf((const uint8_t *)&wh[1]));
426 printf("->%s", ether_sprintf(wh->i_addr3));
427 printf("(%s", ether_sprintf(wh->i_addr2));
428 printf("->%s)", ether_sprintf(wh->i_addr1));
429 break;
430 }
431 switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
432 case IEEE80211_FC0_TYPE_DATA:
433 printf(" data");
434 break;
435 case IEEE80211_FC0_TYPE_MGT:
436 printf(" %s", ieee80211_mgt_subtype_name[
437 (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK)
438 >> IEEE80211_FC0_SUBTYPE_SHIFT]);
439 break;
440 default:
441 printf(" type#%d", wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK);
442 break;
443 }
444 if (IEEE80211_QOS_HAS_SEQ(wh)) {
445 const struct ieee80211_qosframe *qwh =
446 (const struct ieee80211_qosframe *)buf;
447 printf(" QoS [TID %u%s]", qwh->i_qos[0] & IEEE80211_QOS_TID,
448 qwh->i_qos[0] & IEEE80211_QOS_ACKPOLICY ? " ACM" : "");
449 }
450 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
451 int off;
452
453 off = ieee80211_anyhdrspace(ic, wh);
454 printf(" WEP [IV %.02x %.02x %.02x",
455 buf[off+0], buf[off+1], buf[off+2]);
456 if (buf[off+IEEE80211_WEP_IVLEN] & IEEE80211_WEP_EXTIV)
457 printf(" %.02x %.02x %.02x",
458 buf[off+4], buf[off+5], buf[off+6]);
459 printf(" KID %u]", buf[off+IEEE80211_WEP_IVLEN] >> 6);
460 }
461 if (rate >= 0)
462 printf(" %dM", rate / 2);
463 if (rssi >= 0)
464 printf(" +%d", rssi);
465 printf("\n");
466 if (len > 0) {
467 for (i = 0; i < len; i++) {
468 if ((i & 1) == 0)
469 printf(" ");
470 printf("%02x", buf[i]);
471 }
472 printf("\n");
473 }
474 }
475
476 static __inline int
findrix(const struct ieee80211_rateset * rs,int r)477 findrix(const struct ieee80211_rateset *rs, int r)
478 {
479 int i;
480
481 for (i = 0; i < rs->rs_nrates; i++)
482 if ((rs->rs_rates[i] & IEEE80211_RATE_VAL) == r)
483 return i;
484 return -1;
485 }
486
487 int
ieee80211_fix_rate(struct ieee80211_node * ni,struct ieee80211_rateset * nrs,int flags)488 ieee80211_fix_rate(struct ieee80211_node *ni,
489 struct ieee80211_rateset *nrs, int flags)
490 {
491 #define RV(v) ((v) & IEEE80211_RATE_VAL)
492 struct ieee80211vap *vap = ni->ni_vap;
493 struct ieee80211com *ic = ni->ni_ic;
494 int i, j, rix, error;
495 int okrate, badrate, fixedrate, ucastrate;
496 const struct ieee80211_rateset *srs;
497 uint8_t r;
498
499 error = 0;
500 okrate = badrate = 0;
501 ucastrate = vap->iv_txparms[ieee80211_chan2mode(ni->ni_chan)].ucastrate;
502 if (ucastrate != IEEE80211_FIXED_RATE_NONE) {
503 /*
504 * Workaround awkwardness with fixed rate. We are called
505 * to check both the legacy rate set and the HT rate set
506 * but we must apply any legacy fixed rate check only to the
507 * legacy rate set and vice versa. We cannot tell what type
508 * of rate set we've been given (legacy or HT) but we can
509 * distinguish the fixed rate type (MCS have 0x80 set).
510 * So to deal with this the caller communicates whether to
511 * check MCS or legacy rate using the flags and we use the
512 * type of any fixed rate to avoid applying an MCS to a
513 * legacy rate and vice versa.
514 */
515 if (ucastrate & 0x80) {
516 if (flags & IEEE80211_F_DOFRATE)
517 flags &= ~IEEE80211_F_DOFRATE;
518 } else if ((ucastrate & 0x80) == 0) {
519 if (flags & IEEE80211_F_DOFMCS)
520 flags &= ~IEEE80211_F_DOFMCS;
521 }
522 /* NB: required to make MCS match below work */
523 ucastrate &= IEEE80211_RATE_VAL;
524 }
525 fixedrate = IEEE80211_FIXED_RATE_NONE;
526 /*
527 * XXX we are called to process both MCS and legacy rates;
528 * we must use the appropriate basic rate set or chaos will
529 * ensue; for now callers that want MCS must supply
530 * IEEE80211_F_DOBRS; at some point we'll need to split this
531 * function so there are two variants, one for MCS and one
532 * for legacy rates.
533 */
534 if (flags & IEEE80211_F_DOBRS)
535 srs = (const struct ieee80211_rateset *)
536 ieee80211_get_suphtrates(ic, ni->ni_chan);
537 else
538 srs = ieee80211_get_suprates(ic, ni->ni_chan);
539 for (i = 0; i < nrs->rs_nrates; ) {
540 if (flags & IEEE80211_F_DOSORT) {
541 /*
542 * Sort rates.
543 */
544 for (j = i + 1; j < nrs->rs_nrates; j++) {
545 if (RV(nrs->rs_rates[i]) > RV(nrs->rs_rates[j])) {
546 r = nrs->rs_rates[i];
547 nrs->rs_rates[i] = nrs->rs_rates[j];
548 nrs->rs_rates[j] = r;
549 }
550 }
551 }
552 r = nrs->rs_rates[i] & IEEE80211_RATE_VAL;
553 badrate = r;
554 /*
555 * Check for fixed rate.
556 */
557 if (r == ucastrate)
558 fixedrate = r;
559 /*
560 * Check against supported rates.
561 */
562 rix = findrix(srs, r);
563 if (flags & IEEE80211_F_DONEGO) {
564 if (rix < 0) {
565 /*
566 * A rate in the node's rate set is not
567 * supported. If this is a basic rate and we
568 * are operating as a STA then this is an error.
569 * Otherwise we just discard/ignore the rate.
570 */
571 if ((flags & IEEE80211_F_JOIN) &&
572 (nrs->rs_rates[i] & IEEE80211_RATE_BASIC))
573 error++;
574 } else if ((flags & IEEE80211_F_JOIN) == 0) {
575 /*
576 * Overwrite with the supported rate
577 * value so any basic rate bit is set.
578 */
579 nrs->rs_rates[i] = srs->rs_rates[rix];
580 }
581 }
582 if ((flags & IEEE80211_F_DODEL) && rix < 0) {
583 /*
584 * Delete unacceptable rates.
585 */
586 nrs->rs_nrates--;
587 for (j = i; j < nrs->rs_nrates; j++)
588 nrs->rs_rates[j] = nrs->rs_rates[j + 1];
589 nrs->rs_rates[j] = 0;
590 continue;
591 }
592 if (rix >= 0)
593 okrate = nrs->rs_rates[i];
594 i++;
595 }
596 if (okrate == 0 || error != 0 ||
597 ((flags & (IEEE80211_F_DOFRATE|IEEE80211_F_DOFMCS)) &&
598 fixedrate != ucastrate)) {
599 IEEE80211_NOTE(vap, IEEE80211_MSG_XRATE | IEEE80211_MSG_11N, ni,
600 "%s: flags 0x%x okrate %d error %d fixedrate 0x%x "
601 "ucastrate %x\n", __func__, fixedrate, ucastrate, flags);
602 return badrate | IEEE80211_RATE_BASIC;
603 } else
604 return RV(okrate);
605 #undef RV
606 }
607
608 /*
609 * Reset 11g-related state.
610 */
611 void
ieee80211_reset_erp(struct ieee80211com * ic)612 ieee80211_reset_erp(struct ieee80211com *ic)
613 {
614 ic->ic_flags &= ~IEEE80211_F_USEPROT;
615 ic->ic_nonerpsta = 0;
616 ic->ic_longslotsta = 0;
617 /*
618 * Short slot time is enabled only when operating in 11g
619 * and not in an IBSS. We must also honor whether or not
620 * the driver is capable of doing it.
621 */
622 ieee80211_set_shortslottime(ic,
623 IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
624 IEEE80211_IS_CHAN_HT(ic->ic_curchan) ||
625 (IEEE80211_IS_CHAN_ANYG(ic->ic_curchan) &&
626 ic->ic_opmode == IEEE80211_M_HOSTAP &&
627 (ic->ic_caps & IEEE80211_C_SHSLOT)));
628 /*
629 * Set short preamble and ERP barker-preamble flags.
630 */
631 if (IEEE80211_IS_CHAN_A(ic->ic_curchan) ||
632 (ic->ic_caps & IEEE80211_C_SHPREAMBLE)) {
633 ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
634 ic->ic_flags &= ~IEEE80211_F_USEBARKER;
635 } else {
636 ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
637 ic->ic_flags |= IEEE80211_F_USEBARKER;
638 }
639 }
640
641 /*
642 * Set the short slot time state and notify the driver.
643 */
644 void
ieee80211_set_shortslottime(struct ieee80211com * ic,int onoff)645 ieee80211_set_shortslottime(struct ieee80211com *ic, int onoff)
646 {
647 if (onoff)
648 ic->ic_flags |= IEEE80211_F_SHSLOT;
649 else
650 ic->ic_flags &= ~IEEE80211_F_SHSLOT;
651 /* notify driver */
652 if (ic->ic_updateslot != NULL)
653 ic->ic_updateslot(ic->ic_ifp);
654 }
655
656 /*
657 * Check if the specified rate set supports ERP.
658 * NB: the rate set is assumed to be sorted.
659 */
660 int
ieee80211_iserp_rateset(const struct ieee80211_rateset * rs)661 ieee80211_iserp_rateset(const struct ieee80211_rateset *rs)
662 {
663 static const int rates[] = { 2, 4, 11, 22, 12, 24, 48 };
664 int i, j;
665
666 if (rs->rs_nrates < nitems(rates))
667 return 0;
668 for (i = 0; i < nitems(rates); i++) {
669 for (j = 0; j < rs->rs_nrates; j++) {
670 int r = rs->rs_rates[j] & IEEE80211_RATE_VAL;
671 if (rates[i] == r)
672 goto next;
673 if (r > rates[i])
674 return 0;
675 }
676 return 0;
677 next:
678 ;
679 }
680 return 1;
681 }
682
683 /*
684 * Mark the basic rates for the rate table based on the
685 * operating mode. For real 11g we mark all the 11b rates
686 * and 6, 12, and 24 OFDM. For 11b compatibility we mark only
687 * 11b rates. There's also a pseudo 11a-mode used to mark only
688 * the basic OFDM rates.
689 */
690 static void
setbasicrates(struct ieee80211_rateset * rs,enum ieee80211_phymode mode,int add)691 setbasicrates(struct ieee80211_rateset *rs,
692 enum ieee80211_phymode mode, int add)
693 {
694 static const struct ieee80211_rateset basic[IEEE80211_MODE_MAX] = {
695 [IEEE80211_MODE_11A] = { 3, { 12, 24, 48 } },
696 [IEEE80211_MODE_11B] = { 2, { 2, 4 } },
697 /* NB: mixed b/g */
698 [IEEE80211_MODE_11G] = { 4, { 2, 4, 11, 22 } },
699 [IEEE80211_MODE_TURBO_A] = { 3, { 12, 24, 48 } },
700 [IEEE80211_MODE_TURBO_G] = { 4, { 2, 4, 11, 22 } },
701 [IEEE80211_MODE_STURBO_A] = { 3, { 12, 24, 48 } },
702 [IEEE80211_MODE_HALF] = { 3, { 6, 12, 24 } },
703 [IEEE80211_MODE_QUARTER] = { 3, { 3, 6, 12 } },
704 [IEEE80211_MODE_11NA] = { 3, { 12, 24, 48 } },
705 /* NB: mixed b/g */
706 [IEEE80211_MODE_11NG] = { 4, { 2, 4, 11, 22 } },
707 };
708 int i, j;
709
710 for (i = 0; i < rs->rs_nrates; i++) {
711 if (!add)
712 rs->rs_rates[i] &= IEEE80211_RATE_VAL;
713 for (j = 0; j < basic[mode].rs_nrates; j++)
714 if (basic[mode].rs_rates[j] == rs->rs_rates[i]) {
715 rs->rs_rates[i] |= IEEE80211_RATE_BASIC;
716 break;
717 }
718 }
719 }
720
721 /*
722 * Set the basic rates in a rate set.
723 */
724 void
ieee80211_setbasicrates(struct ieee80211_rateset * rs,enum ieee80211_phymode mode)725 ieee80211_setbasicrates(struct ieee80211_rateset *rs,
726 enum ieee80211_phymode mode)
727 {
728 setbasicrates(rs, mode, 0);
729 }
730
731 /*
732 * Add basic rates to a rate set.
733 */
734 void
ieee80211_addbasicrates(struct ieee80211_rateset * rs,enum ieee80211_phymode mode)735 ieee80211_addbasicrates(struct ieee80211_rateset *rs,
736 enum ieee80211_phymode mode)
737 {
738 setbasicrates(rs, mode, 1);
739 }
740
741 /*
742 * WME protocol support.
743 *
744 * The default 11a/b/g/n parameters come from the WiFi Alliance WMM
745 * System Interopability Test Plan (v1.4, Appendix F) and the 802.11n
746 * Draft 2.0 Test Plan (Appendix D).
747 *
748 * Static/Dynamic Turbo mode settings come from Atheros.
749 */
750 typedef struct phyParamType {
751 uint8_t aifsn;
752 uint8_t logcwmin;
753 uint8_t logcwmax;
754 uint16_t txopLimit;
755 uint8_t acm;
756 } paramType;
757
758 static const struct phyParamType phyParamForAC_BE[IEEE80211_MODE_MAX] = {
759 [IEEE80211_MODE_AUTO] = { 3, 4, 6, 0, 0 },
760 [IEEE80211_MODE_11A] = { 3, 4, 6, 0, 0 },
761 [IEEE80211_MODE_11B] = { 3, 4, 6, 0, 0 },
762 [IEEE80211_MODE_11G] = { 3, 4, 6, 0, 0 },
763 [IEEE80211_MODE_FH] = { 3, 4, 6, 0, 0 },
764 [IEEE80211_MODE_TURBO_A]= { 2, 3, 5, 0, 0 },
765 [IEEE80211_MODE_TURBO_G]= { 2, 3, 5, 0, 0 },
766 [IEEE80211_MODE_STURBO_A]={ 2, 3, 5, 0, 0 },
767 [IEEE80211_MODE_HALF] = { 3, 4, 6, 0, 0 },
768 [IEEE80211_MODE_QUARTER]= { 3, 4, 6, 0, 0 },
769 [IEEE80211_MODE_11NA] = { 3, 4, 6, 0, 0 },
770 [IEEE80211_MODE_11NG] = { 3, 4, 6, 0, 0 },
771 };
772 static const struct phyParamType phyParamForAC_BK[IEEE80211_MODE_MAX] = {
773 [IEEE80211_MODE_AUTO] = { 7, 4, 10, 0, 0 },
774 [IEEE80211_MODE_11A] = { 7, 4, 10, 0, 0 },
775 [IEEE80211_MODE_11B] = { 7, 4, 10, 0, 0 },
776 [IEEE80211_MODE_11G] = { 7, 4, 10, 0, 0 },
777 [IEEE80211_MODE_FH] = { 7, 4, 10, 0, 0 },
778 [IEEE80211_MODE_TURBO_A]= { 7, 3, 10, 0, 0 },
779 [IEEE80211_MODE_TURBO_G]= { 7, 3, 10, 0, 0 },
780 [IEEE80211_MODE_STURBO_A]={ 7, 3, 10, 0, 0 },
781 [IEEE80211_MODE_HALF] = { 7, 4, 10, 0, 0 },
782 [IEEE80211_MODE_QUARTER]= { 7, 4, 10, 0, 0 },
783 [IEEE80211_MODE_11NA] = { 7, 4, 10, 0, 0 },
784 [IEEE80211_MODE_11NG] = { 7, 4, 10, 0, 0 },
785 };
786 static const struct phyParamType phyParamForAC_VI[IEEE80211_MODE_MAX] = {
787 [IEEE80211_MODE_AUTO] = { 1, 3, 4, 94, 0 },
788 [IEEE80211_MODE_11A] = { 1, 3, 4, 94, 0 },
789 [IEEE80211_MODE_11B] = { 1, 3, 4, 188, 0 },
790 [IEEE80211_MODE_11G] = { 1, 3, 4, 94, 0 },
791 [IEEE80211_MODE_FH] = { 1, 3, 4, 188, 0 },
792 [IEEE80211_MODE_TURBO_A]= { 1, 2, 3, 94, 0 },
793 [IEEE80211_MODE_TURBO_G]= { 1, 2, 3, 94, 0 },
794 [IEEE80211_MODE_STURBO_A]={ 1, 2, 3, 94, 0 },
795 [IEEE80211_MODE_HALF] = { 1, 3, 4, 94, 0 },
796 [IEEE80211_MODE_QUARTER]= { 1, 3, 4, 94, 0 },
797 [IEEE80211_MODE_11NA] = { 1, 3, 4, 94, 0 },
798 [IEEE80211_MODE_11NG] = { 1, 3, 4, 94, 0 },
799 };
800 static const struct phyParamType phyParamForAC_VO[IEEE80211_MODE_MAX] = {
801 [IEEE80211_MODE_AUTO] = { 1, 2, 3, 47, 0 },
802 [IEEE80211_MODE_11A] = { 1, 2, 3, 47, 0 },
803 [IEEE80211_MODE_11B] = { 1, 2, 3, 102, 0 },
804 [IEEE80211_MODE_11G] = { 1, 2, 3, 47, 0 },
805 [IEEE80211_MODE_FH] = { 1, 2, 3, 102, 0 },
806 [IEEE80211_MODE_TURBO_A]= { 1, 2, 2, 47, 0 },
807 [IEEE80211_MODE_TURBO_G]= { 1, 2, 2, 47, 0 },
808 [IEEE80211_MODE_STURBO_A]={ 1, 2, 2, 47, 0 },
809 [IEEE80211_MODE_HALF] = { 1, 2, 3, 47, 0 },
810 [IEEE80211_MODE_QUARTER]= { 1, 2, 3, 47, 0 },
811 [IEEE80211_MODE_11NA] = { 1, 2, 3, 47, 0 },
812 [IEEE80211_MODE_11NG] = { 1, 2, 3, 47, 0 },
813 };
814
815 static const struct phyParamType bssPhyParamForAC_BE[IEEE80211_MODE_MAX] = {
816 [IEEE80211_MODE_AUTO] = { 3, 4, 10, 0, 0 },
817 [IEEE80211_MODE_11A] = { 3, 4, 10, 0, 0 },
818 [IEEE80211_MODE_11B] = { 3, 4, 10, 0, 0 },
819 [IEEE80211_MODE_11G] = { 3, 4, 10, 0, 0 },
820 [IEEE80211_MODE_FH] = { 3, 4, 10, 0, 0 },
821 [IEEE80211_MODE_TURBO_A]= { 2, 3, 10, 0, 0 },
822 [IEEE80211_MODE_TURBO_G]= { 2, 3, 10, 0, 0 },
823 [IEEE80211_MODE_STURBO_A]={ 2, 3, 10, 0, 0 },
824 [IEEE80211_MODE_HALF] = { 3, 4, 10, 0, 0 },
825 [IEEE80211_MODE_QUARTER]= { 3, 4, 10, 0, 0 },
826 [IEEE80211_MODE_11NA] = { 3, 4, 10, 0, 0 },
827 [IEEE80211_MODE_11NG] = { 3, 4, 10, 0, 0 },
828 };
829 static const struct phyParamType bssPhyParamForAC_VI[IEEE80211_MODE_MAX] = {
830 [IEEE80211_MODE_AUTO] = { 2, 3, 4, 94, 0 },
831 [IEEE80211_MODE_11A] = { 2, 3, 4, 94, 0 },
832 [IEEE80211_MODE_11B] = { 2, 3, 4, 188, 0 },
833 [IEEE80211_MODE_11G] = { 2, 3, 4, 94, 0 },
834 [IEEE80211_MODE_FH] = { 2, 3, 4, 188, 0 },
835 [IEEE80211_MODE_TURBO_A]= { 2, 2, 3, 94, 0 },
836 [IEEE80211_MODE_TURBO_G]= { 2, 2, 3, 94, 0 },
837 [IEEE80211_MODE_STURBO_A]={ 2, 2, 3, 94, 0 },
838 [IEEE80211_MODE_HALF] = { 2, 3, 4, 94, 0 },
839 [IEEE80211_MODE_QUARTER]= { 2, 3, 4, 94, 0 },
840 [IEEE80211_MODE_11NA] = { 2, 3, 4, 94, 0 },
841 [IEEE80211_MODE_11NG] = { 2, 3, 4, 94, 0 },
842 };
843 static const struct phyParamType bssPhyParamForAC_VO[IEEE80211_MODE_MAX] = {
844 [IEEE80211_MODE_AUTO] = { 2, 2, 3, 47, 0 },
845 [IEEE80211_MODE_11A] = { 2, 2, 3, 47, 0 },
846 [IEEE80211_MODE_11B] = { 2, 2, 3, 102, 0 },
847 [IEEE80211_MODE_11G] = { 2, 2, 3, 47, 0 },
848 [IEEE80211_MODE_FH] = { 2, 2, 3, 102, 0 },
849 [IEEE80211_MODE_TURBO_A]= { 1, 2, 2, 47, 0 },
850 [IEEE80211_MODE_TURBO_G]= { 1, 2, 2, 47, 0 },
851 [IEEE80211_MODE_STURBO_A]={ 1, 2, 2, 47, 0 },
852 [IEEE80211_MODE_HALF] = { 2, 2, 3, 47, 0 },
853 [IEEE80211_MODE_QUARTER]= { 2, 2, 3, 47, 0 },
854 [IEEE80211_MODE_11NA] = { 2, 2, 3, 47, 0 },
855 [IEEE80211_MODE_11NG] = { 2, 2, 3, 47, 0 },
856 };
857
858 static void
_setifsparams(struct wmeParams * wmep,const paramType * phy)859 _setifsparams(struct wmeParams *wmep, const paramType *phy)
860 {
861 wmep->wmep_aifsn = phy->aifsn;
862 wmep->wmep_logcwmin = phy->logcwmin;
863 wmep->wmep_logcwmax = phy->logcwmax;
864 wmep->wmep_txopLimit = phy->txopLimit;
865 }
866
867 static void
setwmeparams(struct ieee80211vap * vap,const char * type,int ac,struct wmeParams * wmep,const paramType * phy)868 setwmeparams(struct ieee80211vap *vap, const char *type, int ac,
869 struct wmeParams *wmep, const paramType *phy)
870 {
871 wmep->wmep_acm = phy->acm;
872 _setifsparams(wmep, phy);
873
874 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
875 "set %s (%s) [acm %u aifsn %u logcwmin %u logcwmax %u txop %u]\n",
876 ieee80211_wme_acnames[ac], type,
877 wmep->wmep_acm, wmep->wmep_aifsn, wmep->wmep_logcwmin,
878 wmep->wmep_logcwmax, wmep->wmep_txopLimit);
879 }
880
881 static void
ieee80211_wme_initparams_locked(struct ieee80211vap * vap)882 ieee80211_wme_initparams_locked(struct ieee80211vap *vap)
883 {
884 struct ieee80211com *ic = vap->iv_ic;
885 struct ieee80211_wme_state *wme = &ic->ic_wme;
886 const paramType *pPhyParam, *pBssPhyParam;
887 struct wmeParams *wmep;
888 enum ieee80211_phymode mode;
889 int i;
890
891 IEEE80211_LOCK_ASSERT(ic);
892
893 if ((ic->ic_caps & IEEE80211_C_WME) == 0 || ic->ic_nrunning > 1)
894 return;
895
896 /*
897 * Clear the wme cap_info field so a qoscount from a previous
898 * vap doesn't confuse later code which only parses the beacon
899 * field and updates hardware when said field changes.
900 * Otherwise the hardware is programmed with defaults, not what
901 * the beacon actually announces.
902 */
903 wme->wme_wmeChanParams.cap_info = 0;
904
905 /*
906 * Select mode; we can be called early in which case we
907 * always use auto mode. We know we'll be called when
908 * entering the RUN state with bsschan setup properly
909 * so state will eventually get set correctly
910 */
911 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
912 mode = ieee80211_chan2mode(ic->ic_bsschan);
913 else
914 mode = IEEE80211_MODE_AUTO;
915 for (i = 0; i < WME_NUM_AC; i++) {
916 switch (i) {
917 case WME_AC_BK:
918 pPhyParam = &phyParamForAC_BK[mode];
919 pBssPhyParam = &phyParamForAC_BK[mode];
920 break;
921 case WME_AC_VI:
922 pPhyParam = &phyParamForAC_VI[mode];
923 pBssPhyParam = &bssPhyParamForAC_VI[mode];
924 break;
925 case WME_AC_VO:
926 pPhyParam = &phyParamForAC_VO[mode];
927 pBssPhyParam = &bssPhyParamForAC_VO[mode];
928 break;
929 case WME_AC_BE:
930 default:
931 pPhyParam = &phyParamForAC_BE[mode];
932 pBssPhyParam = &bssPhyParamForAC_BE[mode];
933 break;
934 }
935 wmep = &wme->wme_wmeChanParams.cap_wmeParams[i];
936 if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
937 setwmeparams(vap, "chan", i, wmep, pPhyParam);
938 } else {
939 setwmeparams(vap, "chan", i, wmep, pBssPhyParam);
940 }
941 wmep = &wme->wme_wmeBssChanParams.cap_wmeParams[i];
942 setwmeparams(vap, "bss ", i, wmep, pBssPhyParam);
943 }
944 /* NB: check ic_bss to avoid NULL deref on initial attach */
945 if (vap->iv_bss != NULL) {
946 /*
947 * Calculate agressive mode switching threshold based
948 * on beacon interval. This doesn't need locking since
949 * we're only called before entering the RUN state at
950 * which point we start sending beacon frames.
951 */
952 wme->wme_hipri_switch_thresh =
953 (HIGH_PRI_SWITCH_THRESH * vap->iv_bss->ni_intval) / 100;
954 wme->wme_flags &= ~WME_F_AGGRMODE;
955 ieee80211_wme_updateparams(vap);
956 }
957 }
958
959 void
ieee80211_wme_initparams(struct ieee80211vap * vap)960 ieee80211_wme_initparams(struct ieee80211vap *vap)
961 {
962 struct ieee80211com *ic = vap->iv_ic;
963
964 IEEE80211_LOCK(ic);
965 ieee80211_wme_initparams_locked(vap);
966 IEEE80211_UNLOCK(ic);
967 }
968
969 /*
970 * Update WME parameters for ourself and the BSS.
971 */
972 void
ieee80211_wme_updateparams_locked(struct ieee80211vap * vap)973 ieee80211_wme_updateparams_locked(struct ieee80211vap *vap)
974 {
975 static const paramType aggrParam[IEEE80211_MODE_MAX] = {
976 [IEEE80211_MODE_AUTO] = { 2, 4, 10, 64, 0 },
977 [IEEE80211_MODE_11A] = { 2, 4, 10, 64, 0 },
978 [IEEE80211_MODE_11B] = { 2, 5, 10, 64, 0 },
979 [IEEE80211_MODE_11G] = { 2, 4, 10, 64, 0 },
980 [IEEE80211_MODE_FH] = { 2, 5, 10, 64, 0 },
981 [IEEE80211_MODE_TURBO_A] = { 1, 3, 10, 64, 0 },
982 [IEEE80211_MODE_TURBO_G] = { 1, 3, 10, 64, 0 },
983 [IEEE80211_MODE_STURBO_A] = { 1, 3, 10, 64, 0 },
984 [IEEE80211_MODE_HALF] = { 2, 4, 10, 64, 0 },
985 [IEEE80211_MODE_QUARTER] = { 2, 4, 10, 64, 0 },
986 [IEEE80211_MODE_11NA] = { 2, 4, 10, 64, 0 }, /* XXXcheck*/
987 [IEEE80211_MODE_11NG] = { 2, 4, 10, 64, 0 }, /* XXXcheck*/
988 };
989 struct ieee80211com *ic = vap->iv_ic;
990 struct ieee80211_wme_state *wme = &ic->ic_wme;
991 const struct wmeParams *wmep;
992 struct wmeParams *chanp, *bssp;
993 enum ieee80211_phymode mode;
994 int i;
995 int do_aggrmode = 0;
996
997 /*
998 * Set up the channel access parameters for the physical
999 * device. First populate the configured settings.
1000 */
1001 for (i = 0; i < WME_NUM_AC; i++) {
1002 chanp = &wme->wme_chanParams.cap_wmeParams[i];
1003 wmep = &wme->wme_wmeChanParams.cap_wmeParams[i];
1004 chanp->wmep_aifsn = wmep->wmep_aifsn;
1005 chanp->wmep_logcwmin = wmep->wmep_logcwmin;
1006 chanp->wmep_logcwmax = wmep->wmep_logcwmax;
1007 chanp->wmep_txopLimit = wmep->wmep_txopLimit;
1008
1009 chanp = &wme->wme_bssChanParams.cap_wmeParams[i];
1010 wmep = &wme->wme_wmeBssChanParams.cap_wmeParams[i];
1011 chanp->wmep_aifsn = wmep->wmep_aifsn;
1012 chanp->wmep_logcwmin = wmep->wmep_logcwmin;
1013 chanp->wmep_logcwmax = wmep->wmep_logcwmax;
1014 chanp->wmep_txopLimit = wmep->wmep_txopLimit;
1015 }
1016
1017 /*
1018 * Select mode; we can be called early in which case we
1019 * always use auto mode. We know we'll be called when
1020 * entering the RUN state with bsschan setup properly
1021 * so state will eventually get set correctly
1022 */
1023 if (ic->ic_bsschan != IEEE80211_CHAN_ANYC)
1024 mode = ieee80211_chan2mode(ic->ic_bsschan);
1025 else
1026 mode = IEEE80211_MODE_AUTO;
1027
1028 /*
1029 * This implements agressive mode as found in certain
1030 * vendors' AP's. When there is significant high
1031 * priority (VI/VO) traffic in the BSS throttle back BE
1032 * traffic by using conservative parameters. Otherwise
1033 * BE uses agressive params to optimize performance of
1034 * legacy/non-QoS traffic.
1035 */
1036
1037 /* Hostap? Only if aggressive mode is enabled */
1038 if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
1039 (wme->wme_flags & WME_F_AGGRMODE) != 0)
1040 do_aggrmode = 1;
1041
1042 /*
1043 * Station? Only if we're in a non-QoS BSS.
1044 */
1045 else if ((vap->iv_opmode == IEEE80211_M_STA &&
1046 (vap->iv_bss->ni_flags & IEEE80211_NODE_QOS) == 0))
1047 do_aggrmode = 1;
1048
1049 /*
1050 * IBSS? Only if we we have WME enabled.
1051 */
1052 else if ((vap->iv_opmode == IEEE80211_M_IBSS) &&
1053 (vap->iv_flags & IEEE80211_F_WME))
1054 do_aggrmode = 1;
1055
1056 /*
1057 * If WME is disabled on this VAP, default to aggressive mode
1058 * regardless of the configuration.
1059 */
1060 if ((vap->iv_flags & IEEE80211_F_WME) == 0)
1061 do_aggrmode = 1;
1062
1063 /* XXX WDS? */
1064
1065 /* XXX MBSS? */
1066
1067 if (do_aggrmode) {
1068 chanp = &wme->wme_chanParams.cap_wmeParams[WME_AC_BE];
1069 bssp = &wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE];
1070
1071 chanp->wmep_aifsn = bssp->wmep_aifsn = aggrParam[mode].aifsn;
1072 chanp->wmep_logcwmin = bssp->wmep_logcwmin =
1073 aggrParam[mode].logcwmin;
1074 chanp->wmep_logcwmax = bssp->wmep_logcwmax =
1075 aggrParam[mode].logcwmax;
1076 chanp->wmep_txopLimit = bssp->wmep_txopLimit =
1077 (vap->iv_flags & IEEE80211_F_BURST) ?
1078 aggrParam[mode].txopLimit : 0;
1079 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
1080 "update %s (chan+bss) [acm %u aifsn %u logcwmin %u "
1081 "logcwmax %u txop %u]\n", ieee80211_wme_acnames[WME_AC_BE],
1082 chanp->wmep_acm, chanp->wmep_aifsn, chanp->wmep_logcwmin,
1083 chanp->wmep_logcwmax, chanp->wmep_txopLimit);
1084 }
1085
1086
1087 /*
1088 * Change the contention window based on the number of associated
1089 * stations. If the number of associated stations is 1 and
1090 * aggressive mode is enabled, lower the contention window even
1091 * further.
1092 */
1093 if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
1094 ic->ic_sta_assoc < 2 && (wme->wme_flags & WME_F_AGGRMODE) != 0) {
1095 static const uint8_t logCwMin[IEEE80211_MODE_MAX] = {
1096 [IEEE80211_MODE_AUTO] = 3,
1097 [IEEE80211_MODE_11A] = 3,
1098 [IEEE80211_MODE_11B] = 4,
1099 [IEEE80211_MODE_11G] = 3,
1100 [IEEE80211_MODE_FH] = 4,
1101 [IEEE80211_MODE_TURBO_A] = 3,
1102 [IEEE80211_MODE_TURBO_G] = 3,
1103 [IEEE80211_MODE_STURBO_A] = 3,
1104 [IEEE80211_MODE_HALF] = 3,
1105 [IEEE80211_MODE_QUARTER] = 3,
1106 [IEEE80211_MODE_11NA] = 3,
1107 [IEEE80211_MODE_11NG] = 3,
1108 };
1109 chanp = &wme->wme_chanParams.cap_wmeParams[WME_AC_BE];
1110 bssp = &wme->wme_bssChanParams.cap_wmeParams[WME_AC_BE];
1111
1112 chanp->wmep_logcwmin = bssp->wmep_logcwmin = logCwMin[mode];
1113 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
1114 "update %s (chan+bss) logcwmin %u\n",
1115 ieee80211_wme_acnames[WME_AC_BE], chanp->wmep_logcwmin);
1116 }
1117
1118 /*
1119 * Arrange for the beacon update.
1120 *
1121 * XXX what about MBSS, WDS?
1122 */
1123 if (vap->iv_opmode == IEEE80211_M_HOSTAP
1124 || vap->iv_opmode == IEEE80211_M_IBSS) {
1125 /*
1126 * Arrange for a beacon update and bump the parameter
1127 * set number so associated stations load the new values.
1128 */
1129 wme->wme_bssChanParams.cap_info =
1130 (wme->wme_bssChanParams.cap_info+1) & WME_QOSINFO_COUNT;
1131 ieee80211_beacon_notify(vap, IEEE80211_BEACON_WME);
1132 }
1133
1134 wme->wme_update(ic);
1135
1136 IEEE80211_DPRINTF(vap, IEEE80211_MSG_WME,
1137 "%s: WME params updated, cap_info 0x%x\n", __func__,
1138 vap->iv_opmode == IEEE80211_M_STA ?
1139 wme->wme_wmeChanParams.cap_info :
1140 wme->wme_bssChanParams.cap_info);
1141 }
1142
1143 void
ieee80211_wme_updateparams(struct ieee80211vap * vap)1144 ieee80211_wme_updateparams(struct ieee80211vap *vap)
1145 {
1146 struct ieee80211com *ic = vap->iv_ic;
1147
1148 if (ic->ic_caps & IEEE80211_C_WME) {
1149 IEEE80211_LOCK(ic);
1150 ieee80211_wme_updateparams_locked(vap);
1151 IEEE80211_UNLOCK(ic);
1152 }
1153 }
1154
1155 static void
parent_updown(void * arg,int npending)1156 parent_updown(void *arg, int npending)
1157 {
1158 struct ifnet *parent = arg;
1159
1160 parent->if_ioctl(parent, SIOCSIFFLAGS, NULL);
1161 }
1162
1163 static void
update_mcast(void * arg,int npending)1164 update_mcast(void *arg, int npending)
1165 {
1166 struct ieee80211com *ic = arg;
1167 struct ifnet *parent = ic->ic_ifp;
1168
1169 ic->ic_update_mcast(parent);
1170 }
1171
1172 static void
update_promisc(void * arg,int npending)1173 update_promisc(void *arg, int npending)
1174 {
1175 struct ieee80211com *ic = arg;
1176 struct ifnet *parent = ic->ic_ifp;
1177
1178 ic->ic_update_promisc(parent);
1179 }
1180
1181 static void
update_channel(void * arg,int npending)1182 update_channel(void *arg, int npending)
1183 {
1184 struct ieee80211com *ic = arg;
1185
1186 ic->ic_set_channel(ic);
1187 ieee80211_radiotap_chan_change(ic);
1188 }
1189
1190 static void
update_chw(void * arg,int npending)1191 update_chw(void *arg, int npending)
1192 {
1193 struct ieee80211com *ic = arg;
1194
1195 /*
1196 * XXX should we defer the channel width _config_ update until now?
1197 */
1198 ic->ic_update_chw(ic);
1199 }
1200
1201 /*
1202 * Block until the parent is in a known state. This is
1203 * used after any operations that dispatch a task (e.g.
1204 * to auto-configure the parent device up/down).
1205 */
1206 void
ieee80211_waitfor_parent(struct ieee80211com * ic)1207 ieee80211_waitfor_parent(struct ieee80211com *ic)
1208 {
1209 taskqueue_block(ic->ic_tq);
1210 ieee80211_draintask(ic, &ic->ic_parent_task);
1211 ieee80211_draintask(ic, &ic->ic_mcast_task);
1212 ieee80211_draintask(ic, &ic->ic_promisc_task);
1213 ieee80211_draintask(ic, &ic->ic_chan_task);
1214 ieee80211_draintask(ic, &ic->ic_bmiss_task);
1215 ieee80211_draintask(ic, &ic->ic_chw_task);
1216 taskqueue_unblock(ic->ic_tq);
1217 }
1218
1219 /*
1220 * Start a vap running. If this is the first vap to be
1221 * set running on the underlying device then we
1222 * automatically bring the device up.
1223 */
1224 void
ieee80211_start_locked(struct ieee80211vap * vap)1225 ieee80211_start_locked(struct ieee80211vap *vap)
1226 {
1227 struct ifnet *ifp = vap->iv_ifp;
1228 struct ieee80211com *ic = vap->iv_ic;
1229 struct ifnet *parent = ic->ic_ifp;
1230
1231 IEEE80211_LOCK_ASSERT(ic);
1232
1233 IEEE80211_DPRINTF(vap,
1234 IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
1235 "start running, %d vaps running\n", ic->ic_nrunning);
1236
1237 if ((ifp->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1238 /*
1239 * Mark us running. Note that it's ok to do this first;
1240 * if we need to bring the parent device up we defer that
1241 * to avoid dropping the com lock. We expect the device
1242 * to respond to being marked up by calling back into us
1243 * through ieee80211_start_all at which point we'll come
1244 * back in here and complete the work.
1245 */
1246 ifp->if_drv_flags |= IFF_DRV_RUNNING;
1247 /*
1248 * We are not running; if this we are the first vap
1249 * to be brought up auto-up the parent if necessary.
1250 */
1251 if (ic->ic_nrunning++ == 0 &&
1252 (parent->if_drv_flags & IFF_DRV_RUNNING) == 0) {
1253 IEEE80211_DPRINTF(vap,
1254 IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
1255 "%s: up parent %s\n", __func__, parent->if_xname);
1256 parent->if_flags |= IFF_UP;
1257 ieee80211_runtask(ic, &ic->ic_parent_task);
1258 return;
1259 }
1260 }
1261 /*
1262 * If the parent is up and running, then kick the
1263 * 802.11 state machine as appropriate.
1264 */
1265 if ((parent->if_drv_flags & IFF_DRV_RUNNING) &&
1266 vap->iv_roaming != IEEE80211_ROAMING_MANUAL) {
1267 if (vap->iv_opmode == IEEE80211_M_STA) {
1268 #if 0
1269 /* XXX bypasses scan too easily; disable for now */
1270 /*
1271 * Try to be intelligent about clocking the state
1272 * machine. If we're currently in RUN state then
1273 * we should be able to apply any new state/parameters
1274 * simply by re-associating. Otherwise we need to
1275 * re-scan to select an appropriate ap.
1276 */
1277 if (vap->iv_state >= IEEE80211_S_RUN)
1278 ieee80211_new_state_locked(vap,
1279 IEEE80211_S_ASSOC, 1);
1280 else
1281 #endif
1282 ieee80211_new_state_locked(vap,
1283 IEEE80211_S_SCAN, 0);
1284 } else {
1285 /*
1286 * For monitor+wds mode there's nothing to do but
1287 * start running. Otherwise if this is the first
1288 * vap to be brought up, start a scan which may be
1289 * preempted if the station is locked to a particular
1290 * channel.
1291 */
1292 vap->iv_flags_ext |= IEEE80211_FEXT_REINIT;
1293 if (vap->iv_opmode == IEEE80211_M_MONITOR ||
1294 vap->iv_opmode == IEEE80211_M_WDS)
1295 ieee80211_new_state_locked(vap,
1296 IEEE80211_S_RUN, -1);
1297 else
1298 ieee80211_new_state_locked(vap,
1299 IEEE80211_S_SCAN, 0);
1300 }
1301 }
1302 }
1303
1304 /*
1305 * Start a single vap.
1306 */
1307 void
ieee80211_init(void * arg)1308 ieee80211_init(void *arg)
1309 {
1310 struct ieee80211vap *vap = arg;
1311
1312 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
1313 "%s\n", __func__);
1314
1315 IEEE80211_LOCK(vap->iv_ic);
1316 ieee80211_start_locked(vap);
1317 IEEE80211_UNLOCK(vap->iv_ic);
1318 }
1319
1320 /*
1321 * Start all runnable vap's on a device.
1322 */
1323 void
ieee80211_start_all(struct ieee80211com * ic)1324 ieee80211_start_all(struct ieee80211com *ic)
1325 {
1326 struct ieee80211vap *vap;
1327
1328 IEEE80211_LOCK(ic);
1329 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1330 struct ifnet *ifp = vap->iv_ifp;
1331 if (IFNET_IS_UP_RUNNING(ifp)) /* NB: avoid recursion */
1332 ieee80211_start_locked(vap);
1333 }
1334 IEEE80211_UNLOCK(ic);
1335 }
1336
1337 /*
1338 * Stop a vap. We force it down using the state machine
1339 * then mark it's ifnet not running. If this is the last
1340 * vap running on the underlying device then we close it
1341 * too to insure it will be properly initialized when the
1342 * next vap is brought up.
1343 */
1344 void
ieee80211_stop_locked(struct ieee80211vap * vap)1345 ieee80211_stop_locked(struct ieee80211vap *vap)
1346 {
1347 struct ieee80211com *ic = vap->iv_ic;
1348 struct ifnet *ifp = vap->iv_ifp;
1349 struct ifnet *parent = ic->ic_ifp;
1350
1351 IEEE80211_LOCK_ASSERT(ic);
1352
1353 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
1354 "stop running, %d vaps running\n", ic->ic_nrunning);
1355
1356 ieee80211_new_state_locked(vap, IEEE80211_S_INIT, -1);
1357 if (ifp->if_drv_flags & IFF_DRV_RUNNING) {
1358 ifp->if_drv_flags &= ~IFF_DRV_RUNNING; /* mark us stopped */
1359 if (--ic->ic_nrunning == 0 &&
1360 (parent->if_drv_flags & IFF_DRV_RUNNING)) {
1361 IEEE80211_DPRINTF(vap,
1362 IEEE80211_MSG_STATE | IEEE80211_MSG_DEBUG,
1363 "down parent %s\n", parent->if_xname);
1364 parent->if_flags &= ~IFF_UP;
1365 ieee80211_runtask(ic, &ic->ic_parent_task);
1366 }
1367 }
1368 }
1369
1370 void
ieee80211_stop(struct ieee80211vap * vap)1371 ieee80211_stop(struct ieee80211vap *vap)
1372 {
1373 struct ieee80211com *ic = vap->iv_ic;
1374
1375 IEEE80211_LOCK(ic);
1376 ieee80211_stop_locked(vap);
1377 IEEE80211_UNLOCK(ic);
1378 }
1379
1380 /*
1381 * Stop all vap's running on a device.
1382 */
1383 void
ieee80211_stop_all(struct ieee80211com * ic)1384 ieee80211_stop_all(struct ieee80211com *ic)
1385 {
1386 struct ieee80211vap *vap;
1387
1388 IEEE80211_LOCK(ic);
1389 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1390 struct ifnet *ifp = vap->iv_ifp;
1391 if (IFNET_IS_UP_RUNNING(ifp)) /* NB: avoid recursion */
1392 ieee80211_stop_locked(vap);
1393 }
1394 IEEE80211_UNLOCK(ic);
1395
1396 ieee80211_waitfor_parent(ic);
1397 }
1398
1399 /*
1400 * Stop all vap's running on a device and arrange
1401 * for those that were running to be resumed.
1402 */
1403 void
ieee80211_suspend_all(struct ieee80211com * ic)1404 ieee80211_suspend_all(struct ieee80211com *ic)
1405 {
1406 struct ieee80211vap *vap;
1407
1408 IEEE80211_LOCK(ic);
1409 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1410 struct ifnet *ifp = vap->iv_ifp;
1411 if (IFNET_IS_UP_RUNNING(ifp)) { /* NB: avoid recursion */
1412 vap->iv_flags_ext |= IEEE80211_FEXT_RESUME;
1413 ieee80211_stop_locked(vap);
1414 }
1415 }
1416 IEEE80211_UNLOCK(ic);
1417
1418 ieee80211_waitfor_parent(ic);
1419 }
1420
1421 /*
1422 * Start all vap's marked for resume.
1423 */
1424 void
ieee80211_resume_all(struct ieee80211com * ic)1425 ieee80211_resume_all(struct ieee80211com *ic)
1426 {
1427 struct ieee80211vap *vap;
1428
1429 IEEE80211_LOCK(ic);
1430 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1431 struct ifnet *ifp = vap->iv_ifp;
1432 if (!IFNET_IS_UP_RUNNING(ifp) &&
1433 (vap->iv_flags_ext & IEEE80211_FEXT_RESUME)) {
1434 vap->iv_flags_ext &= ~IEEE80211_FEXT_RESUME;
1435 ieee80211_start_locked(vap);
1436 }
1437 }
1438 IEEE80211_UNLOCK(ic);
1439 }
1440
1441 void
ieee80211_beacon_miss(struct ieee80211com * ic)1442 ieee80211_beacon_miss(struct ieee80211com *ic)
1443 {
1444 IEEE80211_LOCK(ic);
1445 if ((ic->ic_flags & IEEE80211_F_SCAN) == 0) {
1446 /* Process in a taskq, the handler may reenter the driver */
1447 ieee80211_runtask(ic, &ic->ic_bmiss_task);
1448 }
1449 IEEE80211_UNLOCK(ic);
1450 }
1451
1452 static void
beacon_miss(void * arg,int npending)1453 beacon_miss(void *arg, int npending)
1454 {
1455 struct ieee80211com *ic = arg;
1456 struct ieee80211vap *vap;
1457
1458 IEEE80211_LOCK(ic);
1459 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1460 /*
1461 * We only pass events through for sta vap's in RUN state;
1462 * may be too restrictive but for now this saves all the
1463 * handlers duplicating these checks.
1464 */
1465 if (vap->iv_opmode == IEEE80211_M_STA &&
1466 vap->iv_state >= IEEE80211_S_RUN &&
1467 vap->iv_bmiss != NULL)
1468 vap->iv_bmiss(vap);
1469 }
1470 IEEE80211_UNLOCK(ic);
1471 }
1472
1473 static void
beacon_swmiss(void * arg,int npending)1474 beacon_swmiss(void *arg, int npending)
1475 {
1476 struct ieee80211vap *vap = arg;
1477 struct ieee80211com *ic = vap->iv_ic;
1478
1479 IEEE80211_LOCK(ic);
1480 if (vap->iv_state == IEEE80211_S_RUN) {
1481 /* XXX Call multiple times if npending > zero? */
1482 vap->iv_bmiss(vap);
1483 }
1484 IEEE80211_UNLOCK(ic);
1485 }
1486
1487 /*
1488 * Software beacon miss handling. Check if any beacons
1489 * were received in the last period. If not post a
1490 * beacon miss; otherwise reset the counter.
1491 */
1492 void
ieee80211_swbmiss(void * arg)1493 ieee80211_swbmiss(void *arg)
1494 {
1495 struct ieee80211vap *vap = arg;
1496 struct ieee80211com *ic = vap->iv_ic;
1497
1498 IEEE80211_LOCK_ASSERT(ic);
1499
1500 /* XXX sleep state? */
1501 KASSERT(vap->iv_state == IEEE80211_S_RUN,
1502 ("wrong state %d", vap->iv_state));
1503
1504 if (ic->ic_flags & IEEE80211_F_SCAN) {
1505 /*
1506 * If scanning just ignore and reset state. If we get a
1507 * bmiss after coming out of scan because we haven't had
1508 * time to receive a beacon then we should probe the AP
1509 * before posting a real bmiss (unless iv_bmiss_max has
1510 * been artifiically lowered). A cleaner solution might
1511 * be to disable the timer on scan start/end but to handle
1512 * case of multiple sta vap's we'd need to disable the
1513 * timers of all affected vap's.
1514 */
1515 vap->iv_swbmiss_count = 0;
1516 } else if (vap->iv_swbmiss_count == 0) {
1517 if (vap->iv_bmiss != NULL)
1518 ieee80211_runtask(ic, &vap->iv_swbmiss_task);
1519 } else
1520 vap->iv_swbmiss_count = 0;
1521 callout_reset(&vap->iv_swbmiss, vap->iv_swbmiss_period,
1522 ieee80211_swbmiss, vap);
1523 }
1524
1525 /*
1526 * Start an 802.11h channel switch. We record the parameters,
1527 * mark the operation pending, notify each vap through the
1528 * beacon update mechanism so it can update the beacon frame
1529 * contents, and then switch vap's to CSA state to block outbound
1530 * traffic. Devices that handle CSA directly can use the state
1531 * switch to do the right thing so long as they call
1532 * ieee80211_csa_completeswitch when it's time to complete the
1533 * channel change. Devices that depend on the net80211 layer can
1534 * use ieee80211_beacon_update to handle the countdown and the
1535 * channel switch.
1536 */
1537 void
ieee80211_csa_startswitch(struct ieee80211com * ic,struct ieee80211_channel * c,int mode,int count)1538 ieee80211_csa_startswitch(struct ieee80211com *ic,
1539 struct ieee80211_channel *c, int mode, int count)
1540 {
1541 struct ieee80211vap *vap;
1542
1543 IEEE80211_LOCK_ASSERT(ic);
1544
1545 ic->ic_csa_newchan = c;
1546 ic->ic_csa_mode = mode;
1547 ic->ic_csa_count = count;
1548 ic->ic_flags |= IEEE80211_F_CSAPENDING;
1549 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1550 if (vap->iv_opmode == IEEE80211_M_HOSTAP ||
1551 vap->iv_opmode == IEEE80211_M_IBSS ||
1552 vap->iv_opmode == IEEE80211_M_MBSS)
1553 ieee80211_beacon_notify(vap, IEEE80211_BEACON_CSA);
1554 /* switch to CSA state to block outbound traffic */
1555 if (vap->iv_state == IEEE80211_S_RUN)
1556 ieee80211_new_state_locked(vap, IEEE80211_S_CSA, 0);
1557 }
1558 ieee80211_notify_csa(ic, c, mode, count);
1559 }
1560
1561 /*
1562 * Complete the channel switch by transitioning all CSA VAPs to RUN.
1563 * This is called by both the completion and cancellation functions
1564 * so each VAP is placed back in the RUN state and can thus transmit.
1565 */
1566 static void
csa_completeswitch(struct ieee80211com * ic)1567 csa_completeswitch(struct ieee80211com *ic)
1568 {
1569 struct ieee80211vap *vap;
1570
1571 ic->ic_csa_newchan = NULL;
1572 ic->ic_flags &= ~IEEE80211_F_CSAPENDING;
1573
1574 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
1575 if (vap->iv_state == IEEE80211_S_CSA)
1576 ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
1577 }
1578
1579 /*
1580 * Complete an 802.11h channel switch started by ieee80211_csa_startswitch.
1581 * We clear state and move all vap's in CSA state to RUN state
1582 * so they can again transmit.
1583 *
1584 * Although this may not be completely correct, update the BSS channel
1585 * for each VAP to the newly configured channel. The setcurchan sets
1586 * the current operating channel for the interface (so the radio does
1587 * switch over) but the VAP BSS isn't updated, leading to incorrectly
1588 * reported information via ioctl.
1589 */
1590 void
ieee80211_csa_completeswitch(struct ieee80211com * ic)1591 ieee80211_csa_completeswitch(struct ieee80211com *ic)
1592 {
1593 struct ieee80211vap *vap;
1594
1595 IEEE80211_LOCK_ASSERT(ic);
1596
1597 KASSERT(ic->ic_flags & IEEE80211_F_CSAPENDING, ("csa not pending"));
1598
1599 ieee80211_setcurchan(ic, ic->ic_csa_newchan);
1600 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
1601 if (vap->iv_state == IEEE80211_S_CSA)
1602 vap->iv_bss->ni_chan = ic->ic_curchan;
1603
1604 csa_completeswitch(ic);
1605 }
1606
1607 /*
1608 * Cancel an 802.11h channel switch started by ieee80211_csa_startswitch.
1609 * We clear state and move all vap's in CSA state to RUN state
1610 * so they can again transmit.
1611 */
1612 void
ieee80211_csa_cancelswitch(struct ieee80211com * ic)1613 ieee80211_csa_cancelswitch(struct ieee80211com *ic)
1614 {
1615 IEEE80211_LOCK_ASSERT(ic);
1616
1617 csa_completeswitch(ic);
1618 }
1619
1620 /*
1621 * Complete a DFS CAC started by ieee80211_dfs_cac_start.
1622 * We clear state and move all vap's in CAC state to RUN state.
1623 */
1624 void
ieee80211_cac_completeswitch(struct ieee80211vap * vap0)1625 ieee80211_cac_completeswitch(struct ieee80211vap *vap0)
1626 {
1627 struct ieee80211com *ic = vap0->iv_ic;
1628 struct ieee80211vap *vap;
1629
1630 IEEE80211_LOCK(ic);
1631 /*
1632 * Complete CAC state change for lead vap first; then
1633 * clock all the other vap's waiting.
1634 */
1635 KASSERT(vap0->iv_state == IEEE80211_S_CAC,
1636 ("wrong state %d", vap0->iv_state));
1637 ieee80211_new_state_locked(vap0, IEEE80211_S_RUN, 0);
1638
1639 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next)
1640 if (vap->iv_state == IEEE80211_S_CAC)
1641 ieee80211_new_state_locked(vap, IEEE80211_S_RUN, 0);
1642 IEEE80211_UNLOCK(ic);
1643 }
1644
1645 /*
1646 * Force all vap's other than the specified vap to the INIT state
1647 * and mark them as waiting for a scan to complete. These vaps
1648 * will be brought up when the scan completes and the scanning vap
1649 * reaches RUN state by wakeupwaiting.
1650 */
1651 static void
markwaiting(struct ieee80211vap * vap0)1652 markwaiting(struct ieee80211vap *vap0)
1653 {
1654 struct ieee80211com *ic = vap0->iv_ic;
1655 struct ieee80211vap *vap;
1656
1657 IEEE80211_LOCK_ASSERT(ic);
1658
1659 /*
1660 * A vap list entry can not disappear since we are running on the
1661 * taskqueue and a vap destroy will queue and drain another state
1662 * change task.
1663 */
1664 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1665 if (vap == vap0)
1666 continue;
1667 if (vap->iv_state != IEEE80211_S_INIT) {
1668 /* NB: iv_newstate may drop the lock */
1669 vap->iv_newstate(vap, IEEE80211_S_INIT, 0);
1670 IEEE80211_LOCK_ASSERT(ic);
1671 vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
1672 }
1673 }
1674 }
1675
1676 /*
1677 * Wakeup all vap's waiting for a scan to complete. This is the
1678 * companion to markwaiting (above) and is used to coordinate
1679 * multiple vaps scanning.
1680 * This is called from the state taskqueue.
1681 */
1682 static void
wakeupwaiting(struct ieee80211vap * vap0)1683 wakeupwaiting(struct ieee80211vap *vap0)
1684 {
1685 struct ieee80211com *ic = vap0->iv_ic;
1686 struct ieee80211vap *vap;
1687
1688 IEEE80211_LOCK_ASSERT(ic);
1689
1690 /*
1691 * A vap list entry can not disappear since we are running on the
1692 * taskqueue and a vap destroy will queue and drain another state
1693 * change task.
1694 */
1695 TAILQ_FOREACH(vap, &ic->ic_vaps, iv_next) {
1696 if (vap == vap0)
1697 continue;
1698 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANWAIT) {
1699 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANWAIT;
1700 /* NB: sta's cannot go INIT->RUN */
1701 /* NB: iv_newstate may drop the lock */
1702 vap->iv_newstate(vap,
1703 vap->iv_opmode == IEEE80211_M_STA ?
1704 IEEE80211_S_SCAN : IEEE80211_S_RUN, 0);
1705 IEEE80211_LOCK_ASSERT(ic);
1706 }
1707 }
1708 }
1709
1710 /*
1711 * Handle post state change work common to all operating modes.
1712 */
1713 static void
ieee80211_newstate_cb(void * xvap,int npending)1714 ieee80211_newstate_cb(void *xvap, int npending)
1715 {
1716 struct ieee80211vap *vap = xvap;
1717 struct ieee80211com *ic = vap->iv_ic;
1718 enum ieee80211_state nstate, ostate;
1719 int arg, rc;
1720
1721 IEEE80211_LOCK(ic);
1722 nstate = vap->iv_nstate;
1723 arg = vap->iv_nstate_arg;
1724
1725 if (vap->iv_flags_ext & IEEE80211_FEXT_REINIT) {
1726 /*
1727 * We have been requested to drop back to the INIT before
1728 * proceeding to the new state.
1729 */
1730 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1731 "%s: %s -> %s arg %d\n", __func__,
1732 ieee80211_state_name[vap->iv_state],
1733 ieee80211_state_name[IEEE80211_S_INIT], arg);
1734 vap->iv_newstate(vap, IEEE80211_S_INIT, arg);
1735 IEEE80211_LOCK_ASSERT(ic);
1736 vap->iv_flags_ext &= ~IEEE80211_FEXT_REINIT;
1737 }
1738
1739 ostate = vap->iv_state;
1740 if (nstate == IEEE80211_S_SCAN && ostate != IEEE80211_S_INIT) {
1741 /*
1742 * SCAN was forced; e.g. on beacon miss. Force other running
1743 * vap's to INIT state and mark them as waiting for the scan to
1744 * complete. This insures they don't interfere with our
1745 * scanning. Since we are single threaded the vaps can not
1746 * transition again while we are executing.
1747 *
1748 * XXX not always right, assumes ap follows sta
1749 */
1750 markwaiting(vap);
1751 }
1752 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1753 "%s: %s -> %s arg %d\n", __func__,
1754 ieee80211_state_name[ostate], ieee80211_state_name[nstate], arg);
1755
1756 rc = vap->iv_newstate(vap, nstate, arg);
1757 IEEE80211_LOCK_ASSERT(ic);
1758 vap->iv_flags_ext &= ~IEEE80211_FEXT_STATEWAIT;
1759 if (rc != 0) {
1760 /* State transition failed */
1761 KASSERT(rc != EINPROGRESS, ("iv_newstate was deferred"));
1762 KASSERT(nstate != IEEE80211_S_INIT,
1763 ("INIT state change failed"));
1764 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1765 "%s: %s returned error %d\n", __func__,
1766 ieee80211_state_name[nstate], rc);
1767 goto done;
1768 }
1769
1770 /* No actual transition, skip post processing */
1771 if (ostate == nstate)
1772 goto done;
1773
1774 if (nstate == IEEE80211_S_RUN) {
1775 /*
1776 * OACTIVE may be set on the vap if the upper layer
1777 * tried to transmit (e.g. IPv6 NDP) before we reach
1778 * RUN state. Clear it and restart xmit.
1779 *
1780 * Note this can also happen as a result of SLEEP->RUN
1781 * (i.e. coming out of power save mode).
1782 */
1783 vap->iv_ifp->if_drv_flags &= ~IFF_DRV_OACTIVE;
1784
1785 /*
1786 * XXX TODO Kick-start a VAP queue - this should be a method!
1787 */
1788
1789 /* bring up any vaps waiting on us */
1790 wakeupwaiting(vap);
1791 } else if (nstate == IEEE80211_S_INIT) {
1792 /*
1793 * Flush the scan cache if we did the last scan (XXX?)
1794 * and flush any frames on send queues from this vap.
1795 * Note the mgt q is used only for legacy drivers and
1796 * will go away shortly.
1797 */
1798 ieee80211_scan_flush(vap);
1799
1800 /*
1801 * XXX TODO: ic/vap queue flush
1802 */
1803 }
1804 done:
1805 IEEE80211_UNLOCK(ic);
1806 }
1807
1808 /*
1809 * Public interface for initiating a state machine change.
1810 * This routine single-threads the request and coordinates
1811 * the scheduling of multiple vaps for the purpose of selecting
1812 * an operating channel. Specifically the following scenarios
1813 * are handled:
1814 * o only one vap can be selecting a channel so on transition to
1815 * SCAN state if another vap is already scanning then
1816 * mark the caller for later processing and return without
1817 * doing anything (XXX? expectations by caller of synchronous operation)
1818 * o only one vap can be doing CAC of a channel so on transition to
1819 * CAC state if another vap is already scanning for radar then
1820 * mark the caller for later processing and return without
1821 * doing anything (XXX? expectations by caller of synchronous operation)
1822 * o if another vap is already running when a request is made
1823 * to SCAN then an operating channel has been chosen; bypass
1824 * the scan and just join the channel
1825 *
1826 * Note that the state change call is done through the iv_newstate
1827 * method pointer so any driver routine gets invoked. The driver
1828 * will normally call back into operating mode-specific
1829 * ieee80211_newstate routines (below) unless it needs to completely
1830 * bypass the state machine (e.g. because the firmware has it's
1831 * own idea how things should work). Bypassing the net80211 layer
1832 * is usually a mistake and indicates lack of proper integration
1833 * with the net80211 layer.
1834 */
1835 int
ieee80211_new_state_locked(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)1836 ieee80211_new_state_locked(struct ieee80211vap *vap,
1837 enum ieee80211_state nstate, int arg)
1838 {
1839 struct ieee80211com *ic = vap->iv_ic;
1840 struct ieee80211vap *vp;
1841 enum ieee80211_state ostate;
1842 int nrunning, nscanning;
1843
1844 IEEE80211_LOCK_ASSERT(ic);
1845
1846 if (vap->iv_flags_ext & IEEE80211_FEXT_STATEWAIT) {
1847 if (vap->iv_nstate == IEEE80211_S_INIT) {
1848 /*
1849 * XXX The vap is being stopped, do no allow any other
1850 * state changes until this is completed.
1851 */
1852 return -1;
1853 } else if (vap->iv_state != vap->iv_nstate) {
1854 #if 0
1855 /* Warn if the previous state hasn't completed. */
1856 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1857 "%s: pending %s -> %s transition lost\n", __func__,
1858 ieee80211_state_name[vap->iv_state],
1859 ieee80211_state_name[vap->iv_nstate]);
1860 #else
1861 /* XXX temporarily enable to identify issues */
1862 if_printf(vap->iv_ifp,
1863 "%s: pending %s -> %s transition lost\n",
1864 __func__, ieee80211_state_name[vap->iv_state],
1865 ieee80211_state_name[vap->iv_nstate]);
1866 #endif
1867 }
1868 }
1869
1870 nrunning = nscanning = 0;
1871 /* XXX can track this state instead of calculating */
1872 TAILQ_FOREACH(vp, &ic->ic_vaps, iv_next) {
1873 if (vp != vap) {
1874 if (vp->iv_state >= IEEE80211_S_RUN)
1875 nrunning++;
1876 /* XXX doesn't handle bg scan */
1877 /* NB: CAC+AUTH+ASSOC treated like SCAN */
1878 else if (vp->iv_state > IEEE80211_S_INIT)
1879 nscanning++;
1880 }
1881 }
1882 ostate = vap->iv_state;
1883 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1884 "%s: %s -> %s (nrunning %d nscanning %d)\n", __func__,
1885 ieee80211_state_name[ostate], ieee80211_state_name[nstate],
1886 nrunning, nscanning);
1887 switch (nstate) {
1888 case IEEE80211_S_SCAN:
1889 if (ostate == IEEE80211_S_INIT) {
1890 /*
1891 * INIT -> SCAN happens on initial bringup.
1892 */
1893 KASSERT(!(nscanning && nrunning),
1894 ("%d scanning and %d running", nscanning, nrunning));
1895 if (nscanning) {
1896 /*
1897 * Someone is scanning, defer our state
1898 * change until the work has completed.
1899 */
1900 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1901 "%s: defer %s -> %s\n",
1902 __func__, ieee80211_state_name[ostate],
1903 ieee80211_state_name[nstate]);
1904 vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
1905 return 0;
1906 }
1907 if (nrunning) {
1908 /*
1909 * Someone is operating; just join the channel
1910 * they have chosen.
1911 */
1912 /* XXX kill arg? */
1913 /* XXX check each opmode, adhoc? */
1914 if (vap->iv_opmode == IEEE80211_M_STA)
1915 nstate = IEEE80211_S_SCAN;
1916 else
1917 nstate = IEEE80211_S_RUN;
1918 #ifdef IEEE80211_DEBUG
1919 if (nstate != IEEE80211_S_SCAN) {
1920 IEEE80211_DPRINTF(vap,
1921 IEEE80211_MSG_STATE,
1922 "%s: override, now %s -> %s\n",
1923 __func__,
1924 ieee80211_state_name[ostate],
1925 ieee80211_state_name[nstate]);
1926 }
1927 #endif
1928 }
1929 }
1930 break;
1931 case IEEE80211_S_RUN:
1932 if (vap->iv_opmode == IEEE80211_M_WDS &&
1933 (vap->iv_flags_ext & IEEE80211_FEXT_WDSLEGACY) &&
1934 nscanning) {
1935 /*
1936 * Legacy WDS with someone else scanning; don't
1937 * go online until that completes as we should
1938 * follow the other vap to the channel they choose.
1939 */
1940 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1941 "%s: defer %s -> %s (legacy WDS)\n", __func__,
1942 ieee80211_state_name[ostate],
1943 ieee80211_state_name[nstate]);
1944 vap->iv_flags_ext |= IEEE80211_FEXT_SCANWAIT;
1945 return 0;
1946 }
1947 if (vap->iv_opmode == IEEE80211_M_HOSTAP &&
1948 IEEE80211_IS_CHAN_DFS(ic->ic_bsschan) &&
1949 (vap->iv_flags_ext & IEEE80211_FEXT_DFS) &&
1950 !IEEE80211_IS_CHAN_CACDONE(ic->ic_bsschan)) {
1951 /*
1952 * This is a DFS channel, transition to CAC state
1953 * instead of RUN. This allows us to initiate
1954 * Channel Availability Check (CAC) as specified
1955 * by 11h/DFS.
1956 */
1957 nstate = IEEE80211_S_CAC;
1958 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
1959 "%s: override %s -> %s (DFS)\n", __func__,
1960 ieee80211_state_name[ostate],
1961 ieee80211_state_name[nstate]);
1962 }
1963 break;
1964 case IEEE80211_S_INIT:
1965 /* cancel any scan in progress */
1966 ieee80211_cancel_scan(vap);
1967 if (ostate == IEEE80211_S_INIT ) {
1968 /* XXX don't believe this */
1969 /* INIT -> INIT. nothing to do */
1970 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANWAIT;
1971 }
1972 /* fall thru... */
1973 default:
1974 break;
1975 }
1976 /* defer the state change to a thread */
1977 vap->iv_nstate = nstate;
1978 vap->iv_nstate_arg = arg;
1979 vap->iv_flags_ext |= IEEE80211_FEXT_STATEWAIT;
1980 ieee80211_runtask(ic, &vap->iv_nstate_task);
1981 return EINPROGRESS;
1982 }
1983
1984 int
ieee80211_new_state(struct ieee80211vap * vap,enum ieee80211_state nstate,int arg)1985 ieee80211_new_state(struct ieee80211vap *vap,
1986 enum ieee80211_state nstate, int arg)
1987 {
1988 struct ieee80211com *ic = vap->iv_ic;
1989 int rc;
1990
1991 IEEE80211_LOCK(ic);
1992 rc = ieee80211_new_state_locked(vap, nstate, arg);
1993 IEEE80211_UNLOCK(ic);
1994 return rc;
1995 }
1996