Annotation of sys/net80211/ieee80211_node.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: ieee80211_node.c,v 1.28 2007/07/06 18:18:43 damien Exp $ */
2: /* $NetBSD: ieee80211_node.c,v 1.14 2004/05/09 09:18:47 dyoung Exp $ */
3:
4: /*-
5: * Copyright (c) 2001 Atsushi Onoe
6: * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting
7: * All rights reserved.
8: *
9: * Redistribution and use in source and binary forms, with or without
10: * modification, are permitted provided that the following conditions
11: * are met:
12: * 1. Redistributions of source code must retain the above copyright
13: * notice, this list of conditions and the following disclaimer.
14: * 2. Redistributions in binary form must reproduce the above copyright
15: * notice, this list of conditions and the following disclaimer in the
16: * documentation and/or other materials provided with the distribution.
17: * 3. The name of the author may not be used to endorse or promote products
18: * derived from this software without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
21: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
22: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
23: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
24: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
29: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30: */
31:
32: #include "bpfilter.h"
33: #include "bridge.h"
34:
35: #include <sys/param.h>
36: #include <sys/systm.h>
37: #include <sys/mbuf.h>
38: #include <sys/malloc.h>
39: #include <sys/kernel.h>
40: #include <sys/socket.h>
41: #include <sys/sockio.h>
42: #include <sys/endian.h>
43: #include <sys/errno.h>
44: #include <sys/proc.h>
45: #include <sys/sysctl.h>
46: #include <sys/tree.h>
47:
48: #include <net/if.h>
49: #include <net/if_dl.h>
50: #include <net/if_media.h>
51: #include <net/if_arp.h>
52: #include <net/if_llc.h>
53:
54: #if NBPFILTER > 0
55: #include <net/bpf.h>
56: #endif
57:
58: #ifdef INET
59: #include <netinet/in.h>
60: #include <netinet/if_ether.h>
61: #endif
62:
63: #if NBRIDGE > 0
64: #include <net/if_bridge.h>
65: #endif
66:
67: #include <net80211/ieee80211_var.h>
68:
69: #include <dev/rndvar.h>
70:
71: struct ieee80211_node *ieee80211_node_alloc(struct ieee80211com *);
72: void ieee80211_node_free(struct ieee80211com *, struct ieee80211_node *);
73: void ieee80211_node_copy(struct ieee80211com *, struct ieee80211_node *,
74: const struct ieee80211_node *);
75: u_int8_t ieee80211_node_getrssi(struct ieee80211com *,
76: const struct ieee80211_node *);
77: void ieee80211_setup_node(struct ieee80211com *, struct ieee80211_node *,
78: const u_int8_t *);
79: void ieee80211_free_node(struct ieee80211com *, struct ieee80211_node *);
80: struct ieee80211_node *ieee80211_alloc_node_helper(struct ieee80211com *);
81: void ieee80211_node_cleanup(struct ieee80211com *, struct ieee80211_node *);
82: void ieee80211_node_join_11g(struct ieee80211com *, struct ieee80211_node *);
83: void ieee80211_node_leave_11g(struct ieee80211com *, struct ieee80211_node *);
84: void ieee80211_set_tim(struct ieee80211com *, int, int);
85:
86: #define M_80211_NODE M_DEVBUF
87:
88: void
89: ieee80211_node_attach(struct ifnet *ifp)
90: {
91: struct ieee80211com *ic = (void *)ifp;
92: int size;
93:
94: RB_INIT(&ic->ic_tree);
95: ic->ic_node_alloc = ieee80211_node_alloc;
96: ic->ic_node_free = ieee80211_node_free;
97: ic->ic_node_copy = ieee80211_node_copy;
98: ic->ic_node_getrssi = ieee80211_node_getrssi;
99: ic->ic_scangen = 1;
100: ic->ic_max_nnodes = ieee80211_cache_size;
101:
102: if (ic->ic_max_aid == 0)
103: ic->ic_max_aid = IEEE80211_AID_DEF;
104: else if (ic->ic_max_aid > IEEE80211_AID_MAX)
105: ic->ic_max_aid = IEEE80211_AID_MAX;
106: size = howmany(ic->ic_max_aid, 32) * sizeof(u_int32_t);
107: MALLOC(ic->ic_aid_bitmap, u_int32_t *, size, M_DEVBUF, M_NOWAIT);
108: if (ic->ic_aid_bitmap == NULL) {
109: /* XXX no way to recover */
110: printf("%s: no memory for AID bitmap!\n", __func__);
111: ic->ic_max_aid = 0;
112: } else
113: memset(ic->ic_aid_bitmap, 0, size);
114:
115: if (ic->ic_caps & (IEEE80211_C_HOSTAP | IEEE80211_C_IBSS)) {
116: ic->ic_tim_len = howmany(ic->ic_max_aid, 8);
117: MALLOC(ic->ic_tim_bitmap, u_int8_t *, ic->ic_tim_len, M_DEVBUF,
118: M_NOWAIT);
119: if (ic->ic_tim_bitmap == NULL) {
120: printf("%s: no memory for TIM bitmap!\n", __func__);
121: ic->ic_tim_len = 0;
122: } else {
123: memset(ic->ic_tim_bitmap, 0, ic->ic_tim_len);
124: ic->ic_set_tim = ieee80211_set_tim;
125: }
126: }
127: }
128:
129: struct ieee80211_node *
130: ieee80211_alloc_node_helper(struct ieee80211com *ic)
131: {
132: struct ieee80211_node *ni;
133: if (ic->ic_nnodes >= ic->ic_max_nnodes)
134: ieee80211_clean_nodes(ic);
135: if (ic->ic_nnodes >= ic->ic_max_nnodes)
136: return NULL;
137: ni = (*ic->ic_node_alloc)(ic);
138: if (ni != NULL)
139: ic->ic_nnodes++;
140: return ni;
141: }
142:
143: void
144: ieee80211_node_lateattach(struct ifnet *ifp)
145: {
146: struct ieee80211com *ic = (void *)ifp;
147: struct ieee80211_node *ni;
148:
149: ni = ieee80211_alloc_node_helper(ic);
150: if (ni == NULL)
151: panic("unable to setup inital BSS node");
152: ni->ni_chan = IEEE80211_CHAN_ANYC;
153: ic->ic_bss = ieee80211_ref_node(ni);
154: ic->ic_txpower = IEEE80211_TXPOWER_MAX;
155: }
156:
157: void
158: ieee80211_node_detach(struct ifnet *ifp)
159: {
160: struct ieee80211com *ic = (void *)ifp;
161:
162: if (ic->ic_bss != NULL) {
163: (*ic->ic_node_free)(ic, ic->ic_bss);
164: ic->ic_bss = NULL;
165: }
166: ieee80211_free_allnodes(ic);
167: if (ic->ic_aid_bitmap != NULL)
168: FREE(ic->ic_aid_bitmap, M_DEVBUF);
169: if (ic->ic_tim_bitmap != NULL)
170: FREE(ic->ic_tim_bitmap, M_DEVBUF);
171: }
172:
173: /*
174: * AP scanning support.
175: */
176:
177: /*
178: * Initialize the active channel set based on the set
179: * of available channels and the current PHY mode.
180: */
181: void
182: ieee80211_reset_scan(struct ifnet *ifp)
183: {
184: struct ieee80211com *ic = (void *)ifp;
185:
186: memcpy(ic->ic_chan_scan, ic->ic_chan_active,
187: sizeof(ic->ic_chan_active));
188: /* NB: hack, setup so next_scan starts with the first channel */
189: if (ic->ic_bss != NULL && ic->ic_bss->ni_chan == IEEE80211_CHAN_ANYC)
190: ic->ic_bss->ni_chan = &ic->ic_channels[IEEE80211_CHAN_MAX];
191: }
192:
193: /*
194: * Begin an active scan.
195: */
196: void
197: ieee80211_begin_scan(struct ifnet *ifp)
198: {
199: struct ieee80211com *ic = (void *)ifp;
200:
201: if (ic->ic_scan_lock & IEEE80211_SCAN_LOCKED)
202: return;
203: ic->ic_scan_lock |= IEEE80211_SCAN_LOCKED;
204:
205: /*
206: * In all but hostap mode scanning starts off in
207: * an active mode before switching to passive.
208: */
209: if (ic->ic_opmode != IEEE80211_M_HOSTAP) {
210: ic->ic_flags |= IEEE80211_F_ASCAN;
211: ic->ic_stats.is_scan_active++;
212: } else
213: ic->ic_stats.is_scan_passive++;
214: if (ifp->if_flags & IFF_DEBUG)
215: printf("%s: begin %s scan\n", ifp->if_xname,
216: (ic->ic_flags & IEEE80211_F_ASCAN) ?
217: "active" : "passive");
218:
219: /*
220: * Flush any previously seen AP's. Note that the latter
221: * assumes we don't act as both an AP and a station,
222: * otherwise we'll potentially flush state of stations
223: * associated with us.
224: */
225: ieee80211_free_allnodes(ic);
226:
227: /*
228: * Reset the current mode. Setting the current mode will also
229: * reset scan state.
230: */
231: if (IFM_MODE(ic->ic_media.ifm_cur->ifm_media) == IFM_AUTO)
232: ic->ic_curmode = IEEE80211_MODE_AUTO;
233: ieee80211_setmode(ic, ic->ic_curmode);
234:
235: ic->ic_scan_count = 0;
236:
237: /* Scan the next channel. */
238: ieee80211_next_scan(ifp);
239: }
240:
241: /*
242: * Switch to the next channel marked for scanning.
243: */
244: void
245: ieee80211_next_scan(struct ifnet *ifp)
246: {
247: struct ieee80211com *ic = (void *)ifp;
248: struct ieee80211_channel *chan;
249:
250: chan = ic->ic_bss->ni_chan;
251: for (;;) {
252: if (++chan > &ic->ic_channels[IEEE80211_CHAN_MAX])
253: chan = &ic->ic_channels[0];
254: if (isset(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan))) {
255: /*
256: * Ignore channels marked passive-only
257: * during an active scan.
258: */
259: if ((ic->ic_flags & IEEE80211_F_ASCAN) == 0 ||
260: (chan->ic_flags & IEEE80211_CHAN_PASSIVE) == 0)
261: break;
262: }
263: if (chan == ic->ic_bss->ni_chan) {
264: ieee80211_end_scan(ifp);
265: return;
266: }
267: }
268: clrbit(ic->ic_chan_scan, ieee80211_chan2ieee(ic, chan));
269: IEEE80211_DPRINTF(("%s: chan %d->%d\n", __func__,
270: ieee80211_chan2ieee(ic, ic->ic_bss->ni_chan),
271: ieee80211_chan2ieee(ic, chan)));
272: ic->ic_bss->ni_chan = chan;
273: ieee80211_new_state(ic, IEEE80211_S_SCAN, -1);
274: }
275:
276: void
277: ieee80211_create_ibss(struct ieee80211com* ic, struct ieee80211_channel *chan)
278: {
279: struct ieee80211_node *ni;
280: struct ifnet *ifp = &ic->ic_if;
281:
282: ni = ic->ic_bss;
283: if (ifp->if_flags & IFF_DEBUG)
284: printf("%s: creating ibss\n", ifp->if_xname);
285: ic->ic_flags |= IEEE80211_F_SIBSS;
286: ni->ni_chan = chan;
287: ni->ni_rates = ic->ic_sup_rates[ieee80211_chan2mode(ic, ni->ni_chan)];
288: IEEE80211_ADDR_COPY(ni->ni_macaddr, ic->ic_myaddr);
289: IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_myaddr);
290: if (ic->ic_opmode == IEEE80211_M_IBSS) {
291: if ((ic->ic_flags & IEEE80211_F_DESBSSID) != 0)
292: IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_des_bssid);
293: else
294: ni->ni_bssid[0] |= 0x02; /* local bit for IBSS */
295: }
296: ni->ni_esslen = ic->ic_des_esslen;
297: memcpy(ni->ni_essid, ic->ic_des_essid, ni->ni_esslen);
298: ni->ni_rssi = 0;
299: ni->ni_rstamp = 0;
300: memset(ni->ni_tstamp, 0, sizeof(ni->ni_tstamp));
301: ni->ni_intval = ic->ic_lintval;
302: ni->ni_capinfo = IEEE80211_CAPINFO_IBSS;
303: if (ic->ic_flags & IEEE80211_F_WEPON)
304: ni->ni_capinfo |= IEEE80211_CAPINFO_PRIVACY;
305: if (ic->ic_phytype == IEEE80211_T_FH) {
306: ni->ni_fhdwell = 200; /* XXX */
307: ni->ni_fhindex = 1;
308: }
309: ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
310: }
311:
312: int
313: ieee80211_match_bss(struct ieee80211com *ic, struct ieee80211_node *ni)
314: {
315: u_int8_t rate;
316: int fail;
317:
318: fail = 0;
319: if (isclr(ic->ic_chan_active, ieee80211_chan2ieee(ic, ni->ni_chan)))
320: fail |= 0x01;
321: if (ic->ic_des_chan != IEEE80211_CHAN_ANYC &&
322: ni->ni_chan != ic->ic_des_chan)
323: fail |= 0x01;
324: if (ic->ic_opmode == IEEE80211_M_IBSS) {
325: if ((ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) == 0)
326: fail |= 0x02;
327: } else {
328: if ((ni->ni_capinfo & IEEE80211_CAPINFO_ESS) == 0)
329: fail |= 0x02;
330: }
331: if (ic->ic_flags & IEEE80211_F_WEPON) {
332: if ((ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) == 0)
333: fail |= 0x04;
334: } else {
335: /* XXX does this mean privacy is supported or required? */
336: if (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY)
337: fail |= 0x04;
338: }
339: rate = ieee80211_fix_rate(ic, ni, IEEE80211_F_DONEGO);
340: if (rate & IEEE80211_RATE_BASIC)
341: fail |= 0x08;
342: if (ic->ic_des_esslen != 0 &&
343: (ni->ni_esslen != ic->ic_des_esslen ||
344: memcmp(ni->ni_essid, ic->ic_des_essid, ic->ic_des_esslen) != 0))
345: fail |= 0x10;
346: if ((ic->ic_flags & IEEE80211_F_DESBSSID) &&
347: !IEEE80211_ADDR_EQ(ic->ic_des_bssid, ni->ni_bssid))
348: fail |= 0x20;
349: #ifdef IEEE80211_DEBUG
350: if (ic->ic_if.if_flags & IFF_DEBUG) {
351: printf(" %c %s", fail ? '-' : '+',
352: ether_sprintf(ni->ni_macaddr));
353: printf(" %s%c", ether_sprintf(ni->ni_bssid),
354: fail & 0x20 ? '!' : ' ');
355: printf(" %3d%c", ieee80211_chan2ieee(ic, ni->ni_chan),
356: fail & 0x01 ? '!' : ' ');
357: printf(" %+4d", ni->ni_rssi);
358: printf(" %2dM%c", (rate & IEEE80211_RATE_VAL) / 2,
359: fail & 0x08 ? '!' : ' ');
360: printf(" %4s%c",
361: (ni->ni_capinfo & IEEE80211_CAPINFO_ESS) ? "ess" :
362: (ni->ni_capinfo & IEEE80211_CAPINFO_IBSS) ? "ibss" :
363: "????",
364: fail & 0x02 ? '!' : ' ');
365: printf(" %3s%c ",
366: (ni->ni_capinfo & IEEE80211_CAPINFO_PRIVACY) ?
367: "wep" : "no",
368: fail & 0x04 ? '!' : ' ');
369: ieee80211_print_essid(ni->ni_essid, ni->ni_esslen);
370: printf("%s\n", fail & 0x10 ? "!" : "");
371: }
372: #endif
373: return fail;
374: }
375:
376: /*
377: * Complete a scan of potential channels.
378: */
379: void
380: ieee80211_end_scan(struct ifnet *ifp)
381: {
382: struct ieee80211com *ic = (void *)ifp;
383: struct ieee80211_node *ni, *nextbs, *selbs;
384: int i, fail;
385:
386: if (ifp->if_flags & IFF_DEBUG)
387: printf("%s: end %s scan\n", ifp->if_xname,
388: (ic->ic_flags & IEEE80211_F_ASCAN) ?
389: "active" : "passive");
390:
391: if (ic->ic_scan_count)
392: ic->ic_flags &= ~IEEE80211_F_ASCAN;
393:
394: ni = RB_MIN(ieee80211_tree, &ic->ic_tree);
395:
396: if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
397: /* XXX off stack? */
398: u_char occupied[howmany(IEEE80211_CHAN_MAX, NBBY)];
399: /*
400: * The passive scan to look for existing AP's completed,
401: * select a channel to camp on. Identify the channels
402: * that already have one or more AP's and try to locate
403: * an unnoccupied one. If that fails, pick a random
404: * channel from the active set.
405: */
406: RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree)
407: setbit(occupied, ieee80211_chan2ieee(ic, ni->ni_chan));
408: for (i = 0; i < IEEE80211_CHAN_MAX; i++)
409: if (isset(ic->ic_chan_active, i) && isclr(occupied, i))
410: break;
411: if (i == IEEE80211_CHAN_MAX) {
412: fail = arc4random() & 3; /* random 0-3 */
413: for (i = 0; i < IEEE80211_CHAN_MAX; i++)
414: if (isset(ic->ic_chan_active, i) && fail-- == 0)
415: break;
416: }
417: ieee80211_create_ibss(ic, &ic->ic_channels[i]);
418: goto wakeup;
419: }
420: if (ni == NULL) {
421: IEEE80211_DPRINTF(("%s: no scan candidate\n", __func__));
422: notfound:
423: if (ic->ic_opmode == IEEE80211_M_IBSS &&
424: (ic->ic_flags & IEEE80211_F_IBSSON) &&
425: ic->ic_des_esslen != 0) {
426: ieee80211_create_ibss(ic, ic->ic_ibss_chan);
427: goto wakeup;
428: }
429:
430: /*
431: * Scan the next mode if nothing has been found. This
432: * is necessary if the device supports different
433: * incompatible modes in the same channel range, like
434: * like 11b and "pure" 11G mode. This will loop
435: * forever except for user-initiated scans.
436: */
437: if (ieee80211_next_mode(ifp) == IEEE80211_MODE_AUTO) {
438: if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST &&
439: ic->ic_scan_lock & IEEE80211_SCAN_RESUME) {
440: ic->ic_scan_lock = IEEE80211_SCAN_LOCKED;
441: /* Return from an user-initiated scan */
442: wakeup(&ic->ic_scan_lock);
443: } else if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST)
444: goto wakeup;
445: ic->ic_scan_count++;
446: }
447:
448: /*
449: * Reset the list of channels to scan and start again.
450: */
451: ieee80211_next_scan(ifp);
452: return;
453: }
454: selbs = NULL;
455:
456: for (; ni != NULL; ni = nextbs) {
457: nextbs = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni);
458: if (ni->ni_fails) {
459: /*
460: * The configuration of the access points may change
461: * during my scan. So delete the entry for the AP
462: * and retry to associate if there is another beacon.
463: */
464: if (ni->ni_fails++ > 2)
465: ieee80211_free_node(ic, ni);
466: continue;
467: }
468: if (ieee80211_match_bss(ic, ni) == 0) {
469: if (selbs == NULL)
470: selbs = ni;
471: else if (ni->ni_rssi > selbs->ni_rssi)
472: selbs = ni;
473: }
474: }
475: if (selbs == NULL)
476: goto notfound;
477: (*ic->ic_node_copy)(ic, ic->ic_bss, selbs);
478:
479: /*
480: * Set the erp state (mostly the slot time) to deal with
481: * the auto-select case; this should be redundant if the
482: * mode is locked.
483: */
484: ic->ic_curmode = ieee80211_chan2mode(ic, selbs->ni_chan);
485: ieee80211_reset_erp(ic);
486:
487: ieee80211_node_newstate(selbs, IEEE80211_STA_BSS);
488: if (ic->ic_opmode == IEEE80211_M_IBSS) {
489: ieee80211_fix_rate(ic, ic->ic_bss, IEEE80211_F_DOFRATE |
490: IEEE80211_F_DONEGO | IEEE80211_F_DODEL);
491: if (ic->ic_bss->ni_rates.rs_nrates == 0)
492: goto notfound;
493: ieee80211_new_state(ic, IEEE80211_S_RUN, -1);
494: } else {
495: ieee80211_new_state(ic, IEEE80211_S_AUTH, -1);
496: }
497:
498: wakeup:
499: if (ic->ic_scan_lock & IEEE80211_SCAN_REQUEST) {
500: /* Return from an user-initiated scan */
501: wakeup(&ic->ic_scan_lock);
502: }
503:
504: ic->ic_scan_lock = IEEE80211_SCAN_UNLOCKED;
505: }
506:
507: int
508: ieee80211_get_rate(struct ieee80211com *ic)
509: {
510: u_int8_t (*rates)[IEEE80211_RATE_MAXSIZE];
511: int rate;
512:
513: rates = &ic->ic_bss->ni_rates.rs_rates;
514:
515: if (ic->ic_fixed_rate != -1)
516: rate = (*rates)[ic->ic_fixed_rate];
517: else if (ic->ic_state == IEEE80211_S_RUN)
518: rate = (*rates)[ic->ic_bss->ni_txrate];
519: else
520: rate = 0;
521:
522: return rate & IEEE80211_RATE_VAL;
523: }
524:
525: struct ieee80211_node *
526: ieee80211_node_alloc(struct ieee80211com *ic)
527: {
528: struct ieee80211_node *ni;
529: MALLOC(ni, struct ieee80211_node *, sizeof(struct ieee80211_node),
530: M_80211_NODE, M_NOWAIT);
531: if (ni != NULL)
532: memset(ni, 0, sizeof(struct ieee80211_node));
533: return ni;
534: }
535:
536: void
537: ieee80211_node_cleanup(struct ieee80211com *ic, struct ieee80211_node *ni)
538: {
539: }
540:
541: void
542: ieee80211_node_free(struct ieee80211com *ic, struct ieee80211_node *ni)
543: {
544: ieee80211_node_cleanup(ic, ni);
545: FREE(ni, M_80211_NODE);
546: }
547:
548: void
549: ieee80211_node_copy(struct ieee80211com *ic,
550: struct ieee80211_node *dst, const struct ieee80211_node *src)
551: {
552: ieee80211_node_cleanup(ic, dst);
553: *dst = *src;
554: }
555:
556: u_int8_t
557: ieee80211_node_getrssi(struct ieee80211com *ic,
558: const struct ieee80211_node *ni)
559: {
560: return ni->ni_rssi;
561: }
562:
563: void
564: ieee80211_setup_node(struct ieee80211com *ic,
565: struct ieee80211_node *ni, const u_int8_t *macaddr)
566: {
567: int s;
568:
569: IEEE80211_DPRINTF(("%s %s\n", __func__,
570: ether_sprintf((u_int8_t *)macaddr)));
571: IEEE80211_ADDR_COPY(ni->ni_macaddr, macaddr);
572: ieee80211_node_newstate(ni, IEEE80211_STA_CACHE);
573:
574: /*
575: * Note we don't enable the inactive timer when acting
576: * as a station. Nodes created in this mode represent
577: * AP's identified while scanning. If we time them out
578: * then several things happen: we can't return the data
579: * to users to show the list of AP's we encountered, and
580: * more importantly, we'll incorrectly deauthenticate
581: * ourself because the inactivity timer will kick us off.
582: */
583: s = splnet();
584: if (ic->ic_opmode != IEEE80211_M_STA &&
585: RB_EMPTY(&ic->ic_tree))
586: ic->ic_inact_timer = IEEE80211_INACT_WAIT;
587: RB_INSERT(ieee80211_tree, &ic->ic_tree, ni);
588: splx(s);
589: }
590:
591: struct ieee80211_node *
592: ieee80211_alloc_node(struct ieee80211com *ic, const u_int8_t *macaddr)
593: {
594: struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic);
595: if (ni != NULL)
596: ieee80211_setup_node(ic, ni, macaddr);
597: else
598: ic->ic_stats.is_rx_nodealloc++;
599: return ni;
600: }
601:
602: struct ieee80211_node *
603: ieee80211_dup_bss(struct ieee80211com *ic, const u_int8_t *macaddr)
604: {
605: struct ieee80211_node *ni = ieee80211_alloc_node_helper(ic);
606: if (ni != NULL) {
607: ieee80211_setup_node(ic, ni, macaddr);
608: /*
609: * Inherit from ic_bss.
610: */
611: IEEE80211_ADDR_COPY(ni->ni_bssid, ic->ic_bss->ni_bssid);
612: ni->ni_chan = ic->ic_bss->ni_chan;
613: } else
614: ic->ic_stats.is_rx_nodealloc++;
615: return ni;
616: }
617:
618: struct ieee80211_node *
619: ieee80211_find_node(struct ieee80211com *ic, const u_int8_t *macaddr)
620: {
621: struct ieee80211_node ni;
622:
623: IEEE80211_ADDR_COPY(ni.ni_macaddr, macaddr);
624: return (RB_FIND(ieee80211_tree, &ic->ic_tree, &ni));
625: }
626:
627: /*
628: * Return a reference to the appropriate node for sending
629: * a data frame. This handles node discovery in adhoc networks.
630: *
631: * Drivers will call this, so increase the reference count before
632: * returning the node.
633: */
634: struct ieee80211_node *
635: ieee80211_find_txnode(struct ieee80211com *ic, const u_int8_t *macaddr)
636: {
637: struct ieee80211_node *ni;
638: int s;
639:
640: /*
641: * The destination address should be in the node table
642: * unless we are operating in station mode or this is a
643: * multicast/broadcast frame.
644: */
645: if (ic->ic_opmode == IEEE80211_M_STA || IEEE80211_IS_MULTICAST(macaddr))
646: return ieee80211_ref_node(ic->ic_bss);
647:
648: s = splnet();
649: ni = ieee80211_find_node(ic, macaddr);
650: splx(s);
651: if (ni == NULL) {
652: if (ic->ic_opmode != IEEE80211_M_IBSS &&
653: ic->ic_opmode != IEEE80211_M_AHDEMO)
654: return NULL;
655:
656: /*
657: * Fake up a node; this handles node discovery in
658: * adhoc mode. Note that for the driver's benefit
659: * we we treat this like an association so the driver
660: * has an opportunity to setup its private state.
661: *
662: * XXX need better way to handle this; issue probe
663: * request so we can deduce rate set, etc.
664: */
665: if ((ni = ieee80211_dup_bss(ic, macaddr)) == NULL)
666: return NULL;
667: /* XXX no rate negotiation; just dup */
668: ni->ni_rates = ic->ic_bss->ni_rates;
669: if (ic->ic_newassoc)
670: (*ic->ic_newassoc)(ic, ni, 1);
671: }
672: return ieee80211_ref_node(ni);
673: }
674:
675: /*
676: * It is usually desirable to process a Rx packet using its sender's
677: * node-record instead of the BSS record.
678: *
679: * - AP mode: keep a node-record for every authenticated/associated
680: * station *in the BSS*. For future use, we also track neighboring
681: * APs, since they might belong to the same ESS. APs in the same
682: * ESS may bridge packets to each other, forming a Wireless
683: * Distribution System (WDS).
684: *
685: * - IBSS mode: keep a node-record for every station *in the BSS*.
686: * Also track neighboring stations by their beacons/probe responses.
687: *
688: * - monitor mode: keep a node-record for every sender, regardless
689: * of BSS.
690: *
691: * - STA mode: the only available node-record is the BSS record,
692: * ic->ic_bss.
693: *
694: * Of all the 802.11 Control packets, only the node-records for
695: * RTS packets node-record can be looked up.
696: *
697: * Return non-zero if the packet's node-record is kept, zero
698: * otherwise.
699: */
700: static __inline int
701: ieee80211_needs_rxnode(struct ieee80211com *ic,
702: const struct ieee80211_frame *wh, const u_int8_t **bssid)
703: {
704: struct ieee80211_node *bss = ic->ic_bss;
705: int monitor, rc = 0;
706:
707: monitor = (ic->ic_opmode == IEEE80211_M_MONITOR);
708:
709: *bssid = NULL;
710:
711: switch (wh->i_fc[0] & IEEE80211_FC0_TYPE_MASK) {
712: case IEEE80211_FC0_TYPE_CTL:
713: if (!monitor)
714: break;
715: return (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) ==
716: IEEE80211_FC0_SUBTYPE_RTS;
717: case IEEE80211_FC0_TYPE_MGT:
718: *bssid = wh->i_addr3;
719: switch (wh->i_fc[0] & IEEE80211_FC0_SUBTYPE_MASK) {
720: case IEEE80211_FC0_SUBTYPE_BEACON:
721: case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
722: rc = 1;
723: break;
724: default:
725: if (ic->ic_opmode == IEEE80211_M_STA)
726: break;
727: rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid) ||
728: IEEE80211_ADDR_EQ(*bssid, etherbroadcastaddr);
729: break;
730: }
731: break;
732: case IEEE80211_FC0_TYPE_DATA:
733: switch (wh->i_fc[1] & IEEE80211_FC1_DIR_MASK) {
734: case IEEE80211_FC1_DIR_NODS:
735: *bssid = wh->i_addr3;
736: if (ic->ic_opmode == IEEE80211_M_IBSS ||
737: ic->ic_opmode == IEEE80211_M_AHDEMO)
738: rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid);
739: break;
740: case IEEE80211_FC1_DIR_TODS:
741: *bssid = wh->i_addr1;
742: if (ic->ic_opmode == IEEE80211_M_HOSTAP)
743: rc = IEEE80211_ADDR_EQ(*bssid, bss->ni_bssid);
744: break;
745: case IEEE80211_FC1_DIR_FROMDS:
746: case IEEE80211_FC1_DIR_DSTODS:
747: *bssid = wh->i_addr2;
748: rc = (ic->ic_opmode == IEEE80211_M_HOSTAP);
749: break;
750: }
751: break;
752: }
753: return monitor || rc;
754: }
755:
756: /*
757: * Drivers call this, so increase the reference count before returning
758: * the node.
759: */
760: struct ieee80211_node *
761: ieee80211_find_rxnode(struct ieee80211com *ic,
762: const struct ieee80211_frame *wh)
763: {
764: static const u_int8_t zero[] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
765: struct ieee80211_node *ni;
766: const u_int8_t *bssid;
767: int s;
768:
769: if (!ieee80211_needs_rxnode(ic, wh, &bssid))
770: return ieee80211_ref_node(ic->ic_bss);
771:
772: s = splnet();
773: ni = ieee80211_find_node(ic, wh->i_addr2);
774: splx(s);
775:
776: if (ni != NULL)
777: return ieee80211_ref_node(ni);
778: if (ic->ic_opmode == IEEE80211_M_HOSTAP)
779: return ieee80211_ref_node(ic->ic_bss);
780:
781: /* XXX see remarks in ieee80211_find_txnode */
782: /* XXX no rate negotiation; just dup */
783: if ((ni = ieee80211_dup_bss(ic, wh->i_addr2)) == NULL)
784: return ieee80211_ref_node(ic->ic_bss);
785:
786: IEEE80211_ADDR_COPY(ni->ni_bssid, (bssid != NULL) ? bssid : zero);
787:
788: ni->ni_rates = ic->ic_bss->ni_rates;
789: if (ic->ic_newassoc)
790: (*ic->ic_newassoc)(ic, ni, 1);
791:
792: IEEE80211_DPRINTF(("%s: faked-up node %p for %s\n", __func__, ni,
793: ether_sprintf((u_int8_t *)wh->i_addr2)));
794:
795: return ieee80211_ref_node(ni);
796: }
797:
798: struct ieee80211_node *
799: ieee80211_find_node_for_beacon(struct ieee80211com *ic,
800: const u_int8_t *macaddr, const struct ieee80211_channel *chan,
801: const char *ssid, u_int8_t rssi)
802: {
803: struct ieee80211_node *ni, *keep = NULL;
804: int s, score = 0;
805:
806: if ((ni = ieee80211_find_node(ic, macaddr)) != NULL) {
807: s = splnet();
808:
809: if (ni->ni_chan != chan && ni->ni_rssi >= rssi)
810: score++;
811: if (ssid[1] == 0 && ni->ni_esslen != 0)
812: score++;
813: if (score > 0)
814: keep = ni;
815:
816: splx(s);
817: }
818:
819: return (keep);
820: }
821:
822: void
823: ieee80211_free_node(struct ieee80211com *ic, struct ieee80211_node *ni)
824: {
825: if (ni == ic->ic_bss)
826: panic("freeing bss node");
827:
828: IEEE80211_DPRINTF(("%s %s\n", __func__, ether_sprintf(ni->ni_macaddr)));
829: IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
830: RB_REMOVE(ieee80211_tree, &ic->ic_tree, ni);
831: ic->ic_nnodes--;
832: if (!IF_IS_EMPTY(&ni->ni_savedq)) {
833: IF_PURGE(&ni->ni_savedq);
834: if (ic->ic_set_tim != NULL)
835: (*ic->ic_set_tim)(ic, ni->ni_associd, 0);
836: }
837: if (RB_EMPTY(&ic->ic_tree))
838: ic->ic_inact_timer = 0;
839: (*ic->ic_node_free)(ic, ni);
840: /* TBD indicate to drivers that a new node can be allocated */
841: }
842:
843: void
844: ieee80211_release_node(struct ieee80211com *ic, struct ieee80211_node *ni)
845: {
846: int s;
847:
848: IEEE80211_DPRINTF(("%s %s refcnt %d\n", __func__,
849: ether_sprintf(ni->ni_macaddr), ni->ni_refcnt));
850: if (ieee80211_node_decref(ni) == 0 &&
851: ni->ni_state == IEEE80211_STA_COLLECT) {
852: s = splnet();
853: ieee80211_free_node(ic, ni);
854: splx(s);
855: }
856: }
857:
858: void
859: ieee80211_free_allnodes(struct ieee80211com *ic)
860: {
861: struct ieee80211_node *ni;
862: int s;
863:
864: IEEE80211_DPRINTF(("%s\n", __func__));
865: s = splnet();
866: while ((ni = RB_MIN(ieee80211_tree, &ic->ic_tree)) != NULL)
867: ieee80211_free_node(ic, ni);
868: splx(s);
869:
870: if (ic->ic_bss != NULL)
871: ieee80211_node_cleanup(ic, ic->ic_bss); /* for station mode */
872: }
873:
874: /*
875: * Timeout inactive nodes.
876: */
877: void
878: ieee80211_clean_nodes(struct ieee80211com *ic)
879: {
880: struct ieee80211_node *ni, *next_ni;
881: u_int gen = ic->ic_scangen++; /* NB: ok 'cuz single-threaded*/
882: int s;
883:
884: s = splnet();
885: for (ni = RB_MIN(ieee80211_tree, &ic->ic_tree);
886: ni != NULL; ni = next_ni) {
887: next_ni = RB_NEXT(ieee80211_tree, &ic->ic_tree, ni);
888: if (ic->ic_nnodes <= ic->ic_max_nnodes)
889: break;
890: if (ni->ni_scangen == gen) /* previously handled */
891: continue;
892: ni->ni_scangen = gen;
893: if (ni->ni_refcnt > 0)
894: continue;
895: IEEE80211_DPRINTF(("station %s purged from LRU cache\n",
896: ether_sprintf(ni->ni_macaddr)));
897: /*
898: * Send a deauthenticate frame.
899: */
900: if (ic->ic_opmode == IEEE80211_M_HOSTAP) {
901: splx(s);
902: IEEE80211_SEND_MGMT(ic, ni,
903: IEEE80211_FC0_SUBTYPE_DEAUTH,
904: IEEE80211_REASON_AUTH_EXPIRE);
905: s = splnet();
906: ieee80211_node_leave(ic, ni);
907: } else
908: ieee80211_free_node(ic, ni);
909: ic->ic_stats.is_node_timeout++;
910: }
911: splx(s);
912: }
913:
914: void
915: ieee80211_iterate_nodes(struct ieee80211com *ic, ieee80211_iter_func *f,
916: void *arg)
917: {
918: struct ieee80211_node *ni;
919: int s;
920:
921: s = splnet();
922: RB_FOREACH(ni, ieee80211_tree, &ic->ic_tree)
923: (*f)(arg, ni);
924: splx(s);
925: }
926:
927: /*
928: * Check if the specified node supports ERP.
929: */
930: int
931: ieee80211_iserp_sta(const struct ieee80211_node *ni)
932: {
933: #define N(a) (sizeof (a) / sizeof (a)[0])
934: static const u_int8_t rates[] = { 2, 4, 11, 22, 12, 24, 48 };
935: const struct ieee80211_rateset *rs = &ni->ni_rates;
936: int i, j;
937:
938: /*
939: * A STA supports ERP operation if it includes all the Clause 19
940: * mandatory rates in its supported rate set.
941: */
942: for (i = 0; i < N(rates); i++) {
943: for (j = 0; j < rs->rs_nrates; j++) {
944: if ((rs->rs_rates[j] & IEEE80211_RATE_VAL) == rates[i])
945: break;
946: }
947: if (j == rs->rs_nrates)
948: return 0;
949: }
950: return 1;
951: #undef N
952: }
953:
954: /*
955: * Handle a station joining an 11g network.
956: */
957: void
958: ieee80211_node_join_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
959: {
960: if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
961: /*
962: * Joining STA doesn't support short slot time. We must
963: * disable the use of short slot time for all other associated
964: * STAs and give the driver a chance to reconfigure the
965: * hardware.
966: */
967: if (++ic->ic_longslotsta == 1) {
968: if (ic->ic_caps & IEEE80211_C_SHSLOT)
969: ieee80211_set_shortslottime(ic, 0);
970: }
971: IEEE80211_DPRINTF(("[%s] station needs long slot time, "
972: "count %d\n", ether_sprintf(ni->ni_macaddr),
973: ic->ic_longslotsta));
974: }
975:
976: if (!ieee80211_iserp_sta(ni)) {
977: /*
978: * Joining STA is non-ERP.
979: */
980: ic->ic_nonerpsta++;
981:
982: IEEE80211_DPRINTF(("[%s] station is non-ERP, %d non-ERP "
983: "stations associated\n", ether_sprintf(ni->ni_macaddr),
984: ic->ic_nonerpsta));
985:
986: /* must enable the use of protection */
987: if (ic->ic_protmode != IEEE80211_PROT_NONE) {
988: IEEE80211_DPRINTF(("%s: enable use of protection\n",
989: __func__));
990: ic->ic_flags |= IEEE80211_F_USEPROT;
991: }
992:
993: if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_PREAMBLE))
994: ic->ic_flags &= ~IEEE80211_F_SHPREAMBLE;
995: } else
996: ni->ni_flags |= IEEE80211_NODE_ERP;
997: }
998:
999: void
1000: ieee80211_node_join(struct ieee80211com *ic, struct ieee80211_node *ni,
1001: int resp)
1002: {
1003: int newassoc;
1004:
1005: if (ni->ni_associd == 0) {
1006: u_int16_t aid;
1007:
1008: /*
1009: * It would be clever to search the bitmap
1010: * more efficiently, but this will do for now.
1011: */
1012: for (aid = 1; aid < ic->ic_max_aid; aid++) {
1013: if (!IEEE80211_AID_ISSET(aid,
1014: ic->ic_aid_bitmap))
1015: break;
1016: }
1017: if (aid >= ic->ic_max_aid) {
1018: IEEE80211_SEND_MGMT(ic, ni, resp,
1019: IEEE80211_REASON_ASSOC_TOOMANY);
1020: ieee80211_node_leave(ic, ni);
1021: return;
1022: }
1023: ni->ni_associd = aid | 0xc000;
1024: IEEE80211_AID_SET(ni->ni_associd, ic->ic_aid_bitmap);
1025: newassoc = 1;
1026: if (ic->ic_curmode == IEEE80211_MODE_11G)
1027: ieee80211_node_join_11g(ic, ni);
1028: } else
1029: newassoc = 0;
1030:
1031: IEEE80211_DPRINTF(("station %s %s associated at aid %d\n",
1032: ether_sprintf(ni->ni_macaddr),
1033: (newassoc ? "newly" : "already"),
1034: ni->ni_associd & ~0xc000));
1035:
1036: /* give driver a chance to setup state like ni_txrate */
1037: if (ic->ic_newassoc)
1038: (*ic->ic_newassoc)(ic, ni, newassoc);
1039: IEEE80211_SEND_MGMT(ic, ni, resp, IEEE80211_STATUS_SUCCESS);
1040: ieee80211_node_newstate(ni, IEEE80211_STA_ASSOC);
1041:
1042: #if NBRIDGE > 0
1043: /*
1044: * If the parent interface belongs to a bridge, learn
1045: * the node's address dynamically on this interface.
1046: */
1047: if (ic->ic_if.if_bridge != NULL)
1048: bridge_update(&ic->ic_if,
1049: (struct ether_addr *)ni->ni_macaddr, 0);
1050: #endif
1051: }
1052:
1053: /*
1054: * Handle a station leaving an 11g network.
1055: */
1056: void
1057: ieee80211_node_leave_11g(struct ieee80211com *ic, struct ieee80211_node *ni)
1058: {
1059: if (!(ni->ni_capinfo & IEEE80211_CAPINFO_SHORT_SLOTTIME)) {
1060: #ifdef DIAGNOSTIC
1061: if (ic->ic_longslotsta == 0) {
1062: panic("bogus long slot station count %d",
1063: ic->ic_longslotsta);
1064: }
1065: #endif
1066: /* leaving STA did not support short slot time */
1067: if (--ic->ic_longslotsta == 0) {
1068: /*
1069: * All associated STAs now support short slot time, so
1070: * enable this feature and give the driver a chance to
1071: * reconfigure the hardware. Notice that IBSS always
1072: * use a long slot time.
1073: */
1074: if ((ic->ic_caps & IEEE80211_C_SHSLOT) &&
1075: ic->ic_opmode != IEEE80211_M_IBSS)
1076: ieee80211_set_shortslottime(ic, 1);
1077: }
1078: IEEE80211_DPRINTF(("[%s] long slot time station leaves, "
1079: "count now %d\n", ether_sprintf(ni->ni_macaddr),
1080: ic->ic_longslotsta));
1081: }
1082:
1083: if (!(ni->ni_flags & IEEE80211_NODE_ERP)) {
1084: #ifdef DIAGNOSTIC
1085: if (ic->ic_nonerpsta == 0) {
1086: panic("bogus non-ERP station count %d\n",
1087: ic->ic_nonerpsta);
1088: }
1089: #endif
1090: /* leaving STA was non-ERP */
1091: if (--ic->ic_nonerpsta == 0) {
1092: /*
1093: * All associated STAs are now ERP capable, disable use
1094: * of protection and re-enable short preamble support.
1095: */
1096: ic->ic_flags &= ~IEEE80211_F_USEPROT;
1097: if (ic->ic_caps & IEEE80211_C_SHPREAMBLE)
1098: ic->ic_flags |= IEEE80211_F_SHPREAMBLE;
1099: }
1100: IEEE80211_DPRINTF(("[%s] non-ERP station leaves, "
1101: "count now %d\n", ether_sprintf(ni->ni_macaddr),
1102: ic->ic_nonerpsta));
1103: }
1104: }
1105:
1106: /*
1107: * Handle bookkeeping for station deauthentication/disassociation
1108: * when operating as an ap.
1109: */
1110: void
1111: ieee80211_node_leave(struct ieee80211com *ic, struct ieee80211_node *ni)
1112: {
1113: if (ic->ic_opmode != IEEE80211_M_HOSTAP)
1114: panic("not in ap mode, mode %u", ic->ic_opmode);
1115: /*
1116: * If node wasn't previously associated all
1117: * we need to do is reclaim the reference.
1118: */
1119: if (ni->ni_associd == 0)
1120: return;
1121: IEEE80211_AID_CLR(ni->ni_associd, ic->ic_aid_bitmap);
1122: ni->ni_associd = 0;
1123:
1124: if (ic->ic_curmode == IEEE80211_MODE_11G)
1125: ieee80211_node_leave_11g(ic, ni);
1126:
1127: ieee80211_node_newstate(ni, IEEE80211_STA_COLLECT);
1128:
1129: #if NBRIDGE > 0
1130: /*
1131: * If the parent interface belongs to a bridge, delete
1132: * any dynamically learned address for this node.
1133: */
1134: if (ic->ic_if.if_bridge != NULL)
1135: bridge_update(&ic->ic_if,
1136: (struct ether_addr *)ni->ni_macaddr, 1);
1137: #endif
1138: }
1139:
1140: void
1141: ieee80211_set_tim(struct ieee80211com *ic, int aid, int set)
1142: {
1143: if (set)
1144: setbit(ic->ic_tim_bitmap, aid & ~0xc000);
1145: else
1146: clrbit(ic->ic_tim_bitmap, aid & ~0xc000);
1147: }
1148:
1149: /*
1150: * Compare nodes in the tree by lladdr
1151: */
1152: int
1153: ieee80211_node_cmp(const struct ieee80211_node *b1,
1154: const struct ieee80211_node *b2)
1155: {
1156: return (memcmp(b1->ni_macaddr, b2->ni_macaddr, IEEE80211_ADDR_LEN));
1157: }
1158:
1159: /*
1160: * Generate red-black tree function logic
1161: */
1162: RB_GENERATE(ieee80211_tree, ieee80211_node, ni_node, ieee80211_node_cmp);
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