29#endif
30
31/*
32 * IEEE 802.11 IBSS mode support.
33 */
34#include "opt_inet.h"
35#include "opt_wlan.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/mbuf.h>
40#include <sys/malloc.h>
41#include <sys/kernel.h>
42
43#include <sys/socket.h>
44#include <sys/sockio.h>
45#include <sys/endian.h>
46#include <sys/errno.h>
47#include <sys/proc.h>
48#include <sys/sysctl.h>
49
50#include <net/if.h>
51#include <net/if_var.h>
52#include <net/if_media.h>
53#include <net/if_llc.h>
54#include <net/ethernet.h>
55
56#include <net/bpf.h>
57
58#include <net80211/ieee80211_var.h>
59#include <net80211/ieee80211_adhoc.h>
60#include <net80211/ieee80211_input.h>
61#ifdef IEEE80211_SUPPORT_SUPERG
62#include <net80211/ieee80211_superg.h>
63#endif
64#ifdef IEEE80211_SUPPORT_TDMA
65#include <net80211/ieee80211_tdma.h>
66#endif
67#include <net80211/ieee80211_sta.h>
68
69#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
70
71static void adhoc_vattach(struct ieee80211vap *);
72static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
73static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
74static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
75 int subtype, int, int);
76static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
77 int subtype, int, int);
78static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
79
80void
81ieee80211_adhoc_attach(struct ieee80211com *ic)
82{
83 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
84 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
85}
86
87void
88ieee80211_adhoc_detach(struct ieee80211com *ic)
89{
90}
91
92static void
93adhoc_vdetach(struct ieee80211vap *vap)
94{
95}
96
97static void
98adhoc_vattach(struct ieee80211vap *vap)
99{
100 vap->iv_newstate = adhoc_newstate;
101 vap->iv_input = adhoc_input;
102 if (vap->iv_opmode == IEEE80211_M_IBSS)
103 vap->iv_recv_mgmt = adhoc_recv_mgmt;
104 else
105 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
106 vap->iv_recv_ctl = adhoc_recv_ctl;
107 vap->iv_opdetach = adhoc_vdetach;
108#ifdef IEEE80211_SUPPORT_TDMA
109 /*
110 * Throw control to tdma support. Note we do this
111 * after setting up our callbacks so it can piggyback
112 * on top of us.
113 */
114 if (vap->iv_caps & IEEE80211_C_TDMA)
115 ieee80211_tdma_vattach(vap);
116#endif
117}
118
119static void
120sta_leave(void *arg, struct ieee80211_node *ni)
121{
122 struct ieee80211vap *vap = arg;
123
124 if (ni->ni_vap == vap && ni != vap->iv_bss)
125 ieee80211_node_leave(ni);
126}
127
128/*
129 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
130 */
131static int
132adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
133{
134 struct ieee80211com *ic = vap->iv_ic;
135 struct ieee80211_node *ni;
136 enum ieee80211_state ostate;
137
138 IEEE80211_LOCK_ASSERT(vap->iv_ic);
139
140 ostate = vap->iv_state;
141 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
142 __func__, ieee80211_state_name[ostate],
143 ieee80211_state_name[nstate], arg);
144 vap->iv_state = nstate; /* state transition */
145 if (ostate != IEEE80211_S_SCAN)
146 ieee80211_cancel_scan(vap); /* background scan */
147 ni = vap->iv_bss; /* NB: no reference held */
148 switch (nstate) {
149 case IEEE80211_S_INIT:
150 switch (ostate) {
151 case IEEE80211_S_SCAN:
152 ieee80211_cancel_scan(vap);
153 break;
154 default:
155 break;
156 }
157 if (ostate != IEEE80211_S_INIT) {
158 /* NB: optimize INIT -> INIT case */
159 ieee80211_reset_bss(vap);
160 }
161 break;
162 case IEEE80211_S_SCAN:
163 switch (ostate) {
164 case IEEE80211_S_RUN: /* beacon miss */
165 /* purge station table; entries are stale */
166 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
167 /* fall thru... */
168 case IEEE80211_S_INIT:
169 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
170 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
171 /*
172 * Already have a channel; bypass the
173 * scan and startup immediately.
174 */
175 ieee80211_create_ibss(vap,
176 ieee80211_ht_adjust_channel(ic,
177 vap->iv_des_chan, vap->iv_flags_ht));
178 break;
179 }
180 /*
181 * Initiate a scan. We can come here as a result
182 * of an IEEE80211_IOC_SCAN_REQ too in which case
183 * the vap will be marked with IEEE80211_FEXT_SCANREQ
184 * and the scan request parameters will be present
185 * in iv_scanreq. Otherwise we do the default.
186 */
187 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
188 ieee80211_check_scan(vap,
189 vap->iv_scanreq_flags,
190 vap->iv_scanreq_duration,
191 vap->iv_scanreq_mindwell,
192 vap->iv_scanreq_maxdwell,
193 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
194 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
195 } else
196 ieee80211_check_scan_current(vap);
197 break;
198 case IEEE80211_S_SCAN:
199 /*
200 * This can happen because of a change in state
201 * that requires a reset. Trigger a new scan
202 * unless we're in manual roaming mode in which
203 * case an application must issue an explicit request.
204 */
205 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
206 ieee80211_check_scan_current(vap);
207 break;
208 default:
209 goto invalid;
210 }
211 break;
212 case IEEE80211_S_RUN:
213 if (vap->iv_flags & IEEE80211_F_WPA) {
214 /* XXX validate prerequisites */
215 }
216 switch (ostate) {
217 case IEEE80211_S_SCAN:
218#ifdef IEEE80211_DEBUG
219 if (ieee80211_msg_debug(vap)) {
220 ieee80211_note(vap,
221 "synchronized with %s ssid ",
222 ether_sprintf(ni->ni_bssid));
223 ieee80211_print_essid(vap->iv_bss->ni_essid,
224 ni->ni_esslen);
225 /* XXX MCS/HT */
226 printf(" channel %d start %uMb\n",
227 ieee80211_chan2ieee(ic, ic->ic_curchan),
228 IEEE80211_RATE2MBS(ni->ni_txrate));
229 }
230#endif
231 break;
232 case IEEE80211_S_RUN: /* IBSS merge */
233 break;
234 default:
235 goto invalid;
236 }
237 /*
238 * When 802.1x is not in use mark the port authorized
239 * at this point so traffic can flow.
240 */
241 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
242 ieee80211_node_authorize(ni);
243 /*
244 * Fake association when joining an existing bss.
245 */
246 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
247 ic->ic_newassoc != NULL)
248 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
249 break;
250 case IEEE80211_S_SLEEP:
251 vap->iv_sta_ps(vap, 0);
252 break;
253 default:
254 invalid:
255 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
256 "%s: unexpected state transition %s -> %s\n", __func__,
257 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
258 break;
259 }
260 return 0;
261}
262
263/*
264 * Decide if a received management frame should be
265 * printed when debugging is enabled. This filters some
266 * of the less interesting frames that come frequently
267 * (e.g. beacons).
268 */
269static __inline int
270doprint(struct ieee80211vap *vap, int subtype)
271{
272 switch (subtype) {
273 case IEEE80211_FC0_SUBTYPE_BEACON:
274 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
275 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
276 return 1;
277 }
278 return 1;
279}
280
281/*
282 * Process a received frame. The node associated with the sender
283 * should be supplied. If nothing was found in the node table then
284 * the caller is assumed to supply a reference to iv_bss instead.
285 * The RSSI and a timestamp are also supplied. The RSSI data is used
286 * during AP scanning to select a AP to associate with; it can have
287 * any units so long as values have consistent units and higher values
288 * mean ``better signal''. The receive timestamp is currently not used
289 * by the 802.11 layer.
290 */
291static int
292adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
293{
| 29#endif
30
31/*
32 * IEEE 802.11 IBSS mode support.
33 */
34#include "opt_inet.h"
35#include "opt_wlan.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/mbuf.h>
40#include <sys/malloc.h>
41#include <sys/kernel.h>
42
43#include <sys/socket.h>
44#include <sys/sockio.h>
45#include <sys/endian.h>
46#include <sys/errno.h>
47#include <sys/proc.h>
48#include <sys/sysctl.h>
49
50#include <net/if.h>
51#include <net/if_var.h>
52#include <net/if_media.h>
53#include <net/if_llc.h>
54#include <net/ethernet.h>
55
56#include <net/bpf.h>
57
58#include <net80211/ieee80211_var.h>
59#include <net80211/ieee80211_adhoc.h>
60#include <net80211/ieee80211_input.h>
61#ifdef IEEE80211_SUPPORT_SUPERG
62#include <net80211/ieee80211_superg.h>
63#endif
64#ifdef IEEE80211_SUPPORT_TDMA
65#include <net80211/ieee80211_tdma.h>
66#endif
67#include <net80211/ieee80211_sta.h>
68
69#define IEEE80211_RATE2MBS(r) (((r) & IEEE80211_RATE_VAL) / 2)
70
71static void adhoc_vattach(struct ieee80211vap *);
72static int adhoc_newstate(struct ieee80211vap *, enum ieee80211_state, int);
73static int adhoc_input(struct ieee80211_node *, struct mbuf *, int, int);
74static void adhoc_recv_mgmt(struct ieee80211_node *, struct mbuf *,
75 int subtype, int, int);
76static void ahdemo_recv_mgmt(struct ieee80211_node *, struct mbuf *,
77 int subtype, int, int);
78static void adhoc_recv_ctl(struct ieee80211_node *, struct mbuf *, int subtype);
79
80void
81ieee80211_adhoc_attach(struct ieee80211com *ic)
82{
83 ic->ic_vattach[IEEE80211_M_IBSS] = adhoc_vattach;
84 ic->ic_vattach[IEEE80211_M_AHDEMO] = adhoc_vattach;
85}
86
87void
88ieee80211_adhoc_detach(struct ieee80211com *ic)
89{
90}
91
92static void
93adhoc_vdetach(struct ieee80211vap *vap)
94{
95}
96
97static void
98adhoc_vattach(struct ieee80211vap *vap)
99{
100 vap->iv_newstate = adhoc_newstate;
101 vap->iv_input = adhoc_input;
102 if (vap->iv_opmode == IEEE80211_M_IBSS)
103 vap->iv_recv_mgmt = adhoc_recv_mgmt;
104 else
105 vap->iv_recv_mgmt = ahdemo_recv_mgmt;
106 vap->iv_recv_ctl = adhoc_recv_ctl;
107 vap->iv_opdetach = adhoc_vdetach;
108#ifdef IEEE80211_SUPPORT_TDMA
109 /*
110 * Throw control to tdma support. Note we do this
111 * after setting up our callbacks so it can piggyback
112 * on top of us.
113 */
114 if (vap->iv_caps & IEEE80211_C_TDMA)
115 ieee80211_tdma_vattach(vap);
116#endif
117}
118
119static void
120sta_leave(void *arg, struct ieee80211_node *ni)
121{
122 struct ieee80211vap *vap = arg;
123
124 if (ni->ni_vap == vap && ni != vap->iv_bss)
125 ieee80211_node_leave(ni);
126}
127
128/*
129 * IEEE80211_M_IBSS+IEEE80211_M_AHDEMO vap state machine handler.
130 */
131static int
132adhoc_newstate(struct ieee80211vap *vap, enum ieee80211_state nstate, int arg)
133{
134 struct ieee80211com *ic = vap->iv_ic;
135 struct ieee80211_node *ni;
136 enum ieee80211_state ostate;
137
138 IEEE80211_LOCK_ASSERT(vap->iv_ic);
139
140 ostate = vap->iv_state;
141 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
142 __func__, ieee80211_state_name[ostate],
143 ieee80211_state_name[nstate], arg);
144 vap->iv_state = nstate; /* state transition */
145 if (ostate != IEEE80211_S_SCAN)
146 ieee80211_cancel_scan(vap); /* background scan */
147 ni = vap->iv_bss; /* NB: no reference held */
148 switch (nstate) {
149 case IEEE80211_S_INIT:
150 switch (ostate) {
151 case IEEE80211_S_SCAN:
152 ieee80211_cancel_scan(vap);
153 break;
154 default:
155 break;
156 }
157 if (ostate != IEEE80211_S_INIT) {
158 /* NB: optimize INIT -> INIT case */
159 ieee80211_reset_bss(vap);
160 }
161 break;
162 case IEEE80211_S_SCAN:
163 switch (ostate) {
164 case IEEE80211_S_RUN: /* beacon miss */
165 /* purge station table; entries are stale */
166 ieee80211_iterate_nodes(&ic->ic_sta, sta_leave, vap);
167 /* fall thru... */
168 case IEEE80211_S_INIT:
169 if (vap->iv_des_chan != IEEE80211_CHAN_ANYC &&
170 !IEEE80211_IS_CHAN_RADAR(vap->iv_des_chan)) {
171 /*
172 * Already have a channel; bypass the
173 * scan and startup immediately.
174 */
175 ieee80211_create_ibss(vap,
176 ieee80211_ht_adjust_channel(ic,
177 vap->iv_des_chan, vap->iv_flags_ht));
178 break;
179 }
180 /*
181 * Initiate a scan. We can come here as a result
182 * of an IEEE80211_IOC_SCAN_REQ too in which case
183 * the vap will be marked with IEEE80211_FEXT_SCANREQ
184 * and the scan request parameters will be present
185 * in iv_scanreq. Otherwise we do the default.
186 */
187 if (vap->iv_flags_ext & IEEE80211_FEXT_SCANREQ) {
188 ieee80211_check_scan(vap,
189 vap->iv_scanreq_flags,
190 vap->iv_scanreq_duration,
191 vap->iv_scanreq_mindwell,
192 vap->iv_scanreq_maxdwell,
193 vap->iv_scanreq_nssid, vap->iv_scanreq_ssid);
194 vap->iv_flags_ext &= ~IEEE80211_FEXT_SCANREQ;
195 } else
196 ieee80211_check_scan_current(vap);
197 break;
198 case IEEE80211_S_SCAN:
199 /*
200 * This can happen because of a change in state
201 * that requires a reset. Trigger a new scan
202 * unless we're in manual roaming mode in which
203 * case an application must issue an explicit request.
204 */
205 if (vap->iv_roaming == IEEE80211_ROAMING_AUTO)
206 ieee80211_check_scan_current(vap);
207 break;
208 default:
209 goto invalid;
210 }
211 break;
212 case IEEE80211_S_RUN:
213 if (vap->iv_flags & IEEE80211_F_WPA) {
214 /* XXX validate prerequisites */
215 }
216 switch (ostate) {
217 case IEEE80211_S_SCAN:
218#ifdef IEEE80211_DEBUG
219 if (ieee80211_msg_debug(vap)) {
220 ieee80211_note(vap,
221 "synchronized with %s ssid ",
222 ether_sprintf(ni->ni_bssid));
223 ieee80211_print_essid(vap->iv_bss->ni_essid,
224 ni->ni_esslen);
225 /* XXX MCS/HT */
226 printf(" channel %d start %uMb\n",
227 ieee80211_chan2ieee(ic, ic->ic_curchan),
228 IEEE80211_RATE2MBS(ni->ni_txrate));
229 }
230#endif
231 break;
232 case IEEE80211_S_RUN: /* IBSS merge */
233 break;
234 default:
235 goto invalid;
236 }
237 /*
238 * When 802.1x is not in use mark the port authorized
239 * at this point so traffic can flow.
240 */
241 if (ni->ni_authmode != IEEE80211_AUTH_8021X)
242 ieee80211_node_authorize(ni);
243 /*
244 * Fake association when joining an existing bss.
245 */
246 if (!IEEE80211_ADDR_EQ(ni->ni_macaddr, vap->iv_myaddr) &&
247 ic->ic_newassoc != NULL)
248 ic->ic_newassoc(ni, ostate != IEEE80211_S_RUN);
249 break;
250 case IEEE80211_S_SLEEP:
251 vap->iv_sta_ps(vap, 0);
252 break;
253 default:
254 invalid:
255 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE,
256 "%s: unexpected state transition %s -> %s\n", __func__,
257 ieee80211_state_name[ostate], ieee80211_state_name[nstate]);
258 break;
259 }
260 return 0;
261}
262
263/*
264 * Decide if a received management frame should be
265 * printed when debugging is enabled. This filters some
266 * of the less interesting frames that come frequently
267 * (e.g. beacons).
268 */
269static __inline int
270doprint(struct ieee80211vap *vap, int subtype)
271{
272 switch (subtype) {
273 case IEEE80211_FC0_SUBTYPE_BEACON:
274 return (vap->iv_ic->ic_flags & IEEE80211_F_SCAN);
275 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
276 return 1;
277 }
278 return 1;
279}
280
281/*
282 * Process a received frame. The node associated with the sender
283 * should be supplied. If nothing was found in the node table then
284 * the caller is assumed to supply a reference to iv_bss instead.
285 * The RSSI and a timestamp are also supplied. The RSSI data is used
286 * during AP scanning to select a AP to associate with; it can have
287 * any units so long as values have consistent units and higher values
288 * mean ``better signal''. The receive timestamp is currently not used
289 * by the 802.11 layer.
290 */
291static int
292adhoc_input(struct ieee80211_node *ni, struct mbuf *m, int rssi, int nf)
293{
|
418 uint8_t tid = ieee80211_gettid(wh);
419 if (IEEE80211_QOS_HAS_SEQ(wh) &&
420 TID_TO_WME_AC(tid) >= WME_AC_VI)
421 ic->ic_wme.wme_hipri_traffic++;
422 rxseq = le16toh(*(uint16_t *)wh->i_seq);
423 if (! ieee80211_check_rxseq(ni, wh)) {
424 /* duplicate, discard */
425 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
426 bssid, "duplicate",
427 "seqno <%u,%u> fragno <%u,%u> tid %u",
428 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
429 ni->ni_rxseqs[tid] >>
430 IEEE80211_SEQ_SEQ_SHIFT,
431 rxseq & IEEE80211_SEQ_FRAG_MASK,
432 ni->ni_rxseqs[tid] &
433 IEEE80211_SEQ_FRAG_MASK,
434 tid);
435 vap->iv_stats.is_rx_dup++;
436 IEEE80211_NODE_STAT(ni, rx_dup);
437 goto out;
438 }
439 ni->ni_rxseqs[tid] = rxseq;
440 }
441 }
442
443 switch (type) {
444 case IEEE80211_FC0_TYPE_DATA:
445 hdrspace = ieee80211_hdrspace(ic, wh);
446 if (m->m_len < hdrspace &&
447 (m = m_pullup(m, hdrspace)) == NULL) {
448 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
449 ni->ni_macaddr, NULL,
450 "data too short: expecting %u", hdrspace);
451 vap->iv_stats.is_rx_tooshort++;
452 goto out; /* XXX */
453 }
454 if (dir != IEEE80211_FC1_DIR_NODS) {
455 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
456 wh, "data", "incorrect dir 0x%x", dir);
457 vap->iv_stats.is_rx_wrongdir++;
458 goto out;
459 }
460 /* XXX no power-save support */
461
462 /*
463 * Handle A-MPDU re-ordering. If the frame is to be
464 * processed directly then ieee80211_ampdu_reorder
465 * will return 0; otherwise it has consumed the mbuf
466 * and we should do nothing more with it.
467 */
468 if ((m->m_flags & M_AMPDU) &&
469 ieee80211_ampdu_reorder(ni, m) != 0) {
470 m = NULL;
471 goto out;
472 }
473 resubmit_ampdu:
474
475 /*
476 * Handle privacy requirements. Note that we
477 * must not be preempted from here until after
478 * we (potentially) call ieee80211_crypto_demic;
479 * otherwise we may violate assumptions in the
480 * crypto cipher modules used to do delayed update
481 * of replay sequence numbers.
482 */
483 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
484 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
485 /*
486 * Discard encrypted frames when privacy is off.
487 */
488 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
489 wh, "WEP", "%s", "PRIVACY off");
490 vap->iv_stats.is_rx_noprivacy++;
491 IEEE80211_NODE_STAT(ni, rx_noprivacy);
492 goto out;
493 }
494 key = ieee80211_crypto_decap(ni, m, hdrspace);
495 if (key == NULL) {
496 /* NB: stats+msgs handled in crypto_decap */
497 IEEE80211_NODE_STAT(ni, rx_wepfail);
498 goto out;
499 }
500 wh = mtod(m, struct ieee80211_frame *);
501 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
502 } else {
503 /* XXX M_WEP and IEEE80211_F_PRIVACY */
504 key = NULL;
505 }
506
507 /*
508 * Save QoS bits for use below--before we strip the header.
509 */
510 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
511 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
512 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
513 ((struct ieee80211_qosframe *)wh)->i_qos[0];
514 } else
515 qos = 0;
516
517 /*
518 * Next up, any fragmentation.
519 */
520 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
521 m = ieee80211_defrag(ni, m, hdrspace);
522 if (m == NULL) {
523 /* Fragment dropped or frame not complete yet */
524 goto out;
525 }
526 }
527 wh = NULL; /* no longer valid, catch any uses */
528
529 /*
530 * Next strip any MSDU crypto bits.
531 */
532 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
533 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
534 ni->ni_macaddr, "data", "%s", "demic error");
535 vap->iv_stats.is_rx_demicfail++;
536 IEEE80211_NODE_STAT(ni, rx_demicfail);
537 goto out;
538 }
539
540 /* copy to listener after decrypt */
541 if (ieee80211_radiotap_active_vap(vap))
542 ieee80211_radiotap_rx(vap, m);
543 need_tap = 0;
544
545 /*
546 * Finally, strip the 802.11 header.
547 */
548 m = ieee80211_decap(vap, m, hdrspace);
549 if (m == NULL) {
550 /* XXX mask bit to check for both */
551 /* don't count Null data frames as errors */
552 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
553 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
554 goto out;
555 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
556 ni->ni_macaddr, "data", "%s", "decap error");
557 vap->iv_stats.is_rx_decap++;
558 IEEE80211_NODE_STAT(ni, rx_decap);
559 goto err;
560 }
561 eh = mtod(m, struct ether_header *);
562 if (!ieee80211_node_is_authorized(ni)) {
563 /*
564 * Deny any non-PAE frames received prior to
565 * authorization. For open/shared-key
566 * authentication the port is mark authorized
567 * after authentication completes. For 802.1x
568 * the port is not marked authorized by the
569 * authenticator until the handshake has completed.
570 */
571 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
572 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
573 eh->ether_shost, "data",
574 "unauthorized port: ether type 0x%x len %u",
575 eh->ether_type, m->m_pkthdr.len);
576 vap->iv_stats.is_rx_unauth++;
577 IEEE80211_NODE_STAT(ni, rx_unauth);
578 goto err;
579 }
580 } else {
581 /*
582 * When denying unencrypted frames, discard
583 * any non-PAE frames received without encryption.
584 */
585 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
586 (key == NULL && (m->m_flags & M_WEP) == 0) &&
587 eh->ether_type != htons(ETHERTYPE_PAE)) {
588 /*
589 * Drop unencrypted frames.
590 */
591 vap->iv_stats.is_rx_unencrypted++;
592 IEEE80211_NODE_STAT(ni, rx_unencrypted);
593 goto out;
594 }
595 }
596 /* XXX require HT? */
597 if (qos & IEEE80211_QOS_AMSDU) {
598 m = ieee80211_decap_amsdu(ni, m);
599 if (m == NULL)
600 return IEEE80211_FC0_TYPE_DATA;
601 } else {
602#ifdef IEEE80211_SUPPORT_SUPERG
603 m = ieee80211_decap_fastframe(vap, ni, m);
604 if (m == NULL)
605 return IEEE80211_FC0_TYPE_DATA;
606#endif
607 }
608 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
609 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
610 else
611 ieee80211_deliver_data(vap, ni, m);
612 return IEEE80211_FC0_TYPE_DATA;
613
614 case IEEE80211_FC0_TYPE_MGT:
615 vap->iv_stats.is_rx_mgmt++;
616 IEEE80211_NODE_STAT(ni, rx_mgmt);
617 if (dir != IEEE80211_FC1_DIR_NODS) {
618 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
619 wh, "data", "incorrect dir 0x%x", dir);
620 vap->iv_stats.is_rx_wrongdir++;
621 goto err;
622 }
623 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
624 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
625 ni->ni_macaddr, "mgt", "too short: len %u",
626 m->m_pkthdr.len);
627 vap->iv_stats.is_rx_tooshort++;
628 goto out;
629 }
630#ifdef IEEE80211_DEBUG
631 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
632 ieee80211_msg_dumppkts(vap)) {
633 if_printf(ifp, "received %s from %s rssi %d\n",
634 ieee80211_mgt_subtype_name[subtype >>
635 IEEE80211_FC0_SUBTYPE_SHIFT],
636 ether_sprintf(wh->i_addr2), rssi);
637 }
638#endif
639 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
640 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
641 wh, NULL, "%s", "WEP set but not permitted");
642 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
643 goto out;
644 }
645 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
646 goto out;
647
648 case IEEE80211_FC0_TYPE_CTL:
649 vap->iv_stats.is_rx_ctl++;
650 IEEE80211_NODE_STAT(ni, rx_ctrl);
651 vap->iv_recv_ctl(ni, m, subtype);
652 goto out;
653
654 default:
655 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
656 wh, "bad", "frame type 0x%x", type);
657 /* should not come here */
658 break;
659 }
660err:
661 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
662out:
663 if (m != NULL) {
664 if (need_tap && ieee80211_radiotap_active_vap(vap))
665 ieee80211_radiotap_rx(vap, m);
666 m_freem(m);
667 }
668 return type;
669}
670
671static int
672is11bclient(const uint8_t *rates, const uint8_t *xrates)
673{
674 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
675 int i;
676
677 /* NB: the 11b clients we care about will not have xrates */
678 if (xrates != NULL || rates == NULL)
679 return 0;
680 for (i = 0; i < rates[1]; i++) {
681 int r = rates[2+i] & IEEE80211_RATE_VAL;
682 if (r > 2*11 || ((1<<r) & brates) == 0)
683 return 0;
684 }
685 return 1;
686}
687
688static void
689adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
690 int subtype, int rssi, int nf)
691{
692 struct ieee80211vap *vap = ni->ni_vap;
693 struct ieee80211com *ic = ni->ni_ic;
694 struct ieee80211_frame *wh;
695 uint8_t *frm, *efrm, *sfrm;
696 uint8_t *ssid, *rates, *xrates;
697#if 0
698 int ht_state_change = 0;
699#endif
700
701 wh = mtod(m0, struct ieee80211_frame *);
702 frm = (uint8_t *)&wh[1];
703 efrm = mtod(m0, uint8_t *) + m0->m_len;
704 switch (subtype) {
705 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
706 case IEEE80211_FC0_SUBTYPE_BEACON: {
707 struct ieee80211_scanparams scan;
708 /*
709 * We process beacon/probe response
710 * frames to discover neighbors.
711 */
712 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
713 return;
714 /*
715 * Count frame now that we know it's to be processed.
716 */
717 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
718 vap->iv_stats.is_rx_beacon++; /* XXX remove */
719 IEEE80211_NODE_STAT(ni, rx_beacons);
720 } else
721 IEEE80211_NODE_STAT(ni, rx_proberesp);
722 /*
723 * If scanning, just pass information to the scan module.
724 */
725 if (ic->ic_flags & IEEE80211_F_SCAN) {
726 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
727 /*
728 * Actively scanning a channel marked passive;
729 * send a probe request now that we know there
730 * is 802.11 traffic present.
731 *
732 * XXX check if the beacon we recv'd gives
733 * us what we need and suppress the probe req
734 */
735 ieee80211_probe_curchan(vap, 1);
736 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
737 }
738 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
739 subtype, rssi, nf);
740 return;
741 }
742 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
743 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
744 /*
745 * Create a new entry in the neighbor table.
746 */
747 ni = ieee80211_add_neighbor(vap, wh, &scan);
748 } else if (ni->ni_capinfo == 0) {
749 /*
750 * Update faked node created on transmit.
751 * Note this also updates the tsf.
752 */
753 ieee80211_init_neighbor(ni, wh, &scan);
754 } else {
755 /*
756 * Record tsf for potential resync.
757 */
758 memcpy(ni->ni_tstamp.data, scan.tstamp,
759 sizeof(ni->ni_tstamp));
760 }
761 /*
762 * This isn't enabled yet - otherwise it would
763 * update the HT parameters and channel width
764 * from any node, which could lead to lots of
765 * strange behaviour if the 11n nodes aren't
766 * exactly configured to match.
767 */
768#if 0
769 if (scan.htcap != NULL && scan.htinfo != NULL &&
770 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
771 if (ieee80211_ht_updateparams(ni,
772 scan.htcap, scan.htinfo))
773 ht_state_change = 1;
774 }
775#endif
776 if (ni != NULL) {
777 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
778 ni->ni_noise = nf;
779 }
780 /*
781 * Same here - the channel width change should
782 * be applied to the specific peer node, not
783 * to the ic. Ie, the interface configuration
784 * should stay in its current channel width;
785 * but it should change the rate control and
786 * any queued frames for the given node only.
787 *
788 * Since there's no (current) way to inform
789 * the driver that a channel width change has
790 * occured for a single node, just stub this
791 * out.
792 */
793#if 0
794 if (ht_state_change)
795 ieee80211_update_chw(ic);
796#endif
797 }
798 break;
799 }
800
801 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
802 if (vap->iv_state != IEEE80211_S_RUN) {
803 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
804 wh, NULL, "wrong state %s",
805 ieee80211_state_name[vap->iv_state]);
806 vap->iv_stats.is_rx_mgtdiscard++;
807 return;
808 }
809 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
810 /* frame must be directed */
811 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
812 wh, NULL, "%s", "not unicast");
813 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
814 return;
815 }
816
817 /*
818 * prreq frame format
819 * [tlv] ssid
820 * [tlv] supported rates
821 * [tlv] extended supported rates
822 */
823 ssid = rates = xrates = NULL;
824 sfrm = frm;
825 while (efrm - frm > 1) {
826 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
827 switch (*frm) {
828 case IEEE80211_ELEMID_SSID:
829 ssid = frm;
830 break;
831 case IEEE80211_ELEMID_RATES:
832 rates = frm;
833 break;
834 case IEEE80211_ELEMID_XRATES:
835 xrates = frm;
836 break;
837 }
838 frm += frm[1] + 2;
839 }
840 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
841 if (xrates != NULL)
842 IEEE80211_VERIFY_ELEMENT(xrates,
843 IEEE80211_RATE_MAXSIZE - rates[1], return);
844 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
845 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
846 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
847 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
848 wh, NULL,
849 "%s", "no ssid with ssid suppression enabled");
850 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
851 return;
852 }
853
854 /* XXX find a better class or define it's own */
855 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
856 "%s", "recv probe req");
857 /*
858 * Some legacy 11b clients cannot hack a complete
859 * probe response frame. When the request includes
860 * only a bare-bones rate set, communicate this to
861 * the transmit side.
862 */
863 ieee80211_send_proberesp(vap, wh->i_addr2,
864 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
865 break;
866
867 case IEEE80211_FC0_SUBTYPE_ACTION:
868 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
869 if (ni == vap->iv_bss) {
870 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
871 wh, NULL, "%s", "unknown node");
872 vap->iv_stats.is_rx_mgtdiscard++;
873 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
874 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
875 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
876 wh, NULL, "%s", "not for us");
877 vap->iv_stats.is_rx_mgtdiscard++;
878 } else if (vap->iv_state != IEEE80211_S_RUN) {
879 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
880 wh, NULL, "wrong state %s",
881 ieee80211_state_name[vap->iv_state]);
882 vap->iv_stats.is_rx_mgtdiscard++;
883 } else {
884 if (ieee80211_parse_action(ni, m0) == 0)
885 (void)ic->ic_recv_action(ni, wh, frm, efrm);
886 }
887 break;
888
889 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
890 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
891 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
892 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
893 case IEEE80211_FC0_SUBTYPE_ATIM:
894 case IEEE80211_FC0_SUBTYPE_DISASSOC:
895 case IEEE80211_FC0_SUBTYPE_AUTH:
896 case IEEE80211_FC0_SUBTYPE_DEAUTH:
897 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
898 wh, NULL, "%s", "not handled");
899 vap->iv_stats.is_rx_mgtdiscard++;
900 break;
901
902 default:
903 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
904 wh, "mgt", "subtype 0x%x not handled", subtype);
905 vap->iv_stats.is_rx_badsubtype++;
906 break;
907 }
908}
909#undef IEEE80211_VERIFY_LENGTH
910#undef IEEE80211_VERIFY_ELEMENT
911
912static void
913ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
914 int subtype, int rssi, int nf)
915{
916 struct ieee80211vap *vap = ni->ni_vap;
917 struct ieee80211com *ic = ni->ni_ic;
918 struct ieee80211_frame *wh;
919
920 /*
921 * Process management frames when scanning; useful for doing
922 * a site-survey.
923 */
924 if (ic->ic_flags & IEEE80211_F_SCAN)
925 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
926 else {
927 wh = mtod(m0, struct ieee80211_frame *);
928 switch (subtype) {
929 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
930 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
931 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
932 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
933 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
934 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
935 case IEEE80211_FC0_SUBTYPE_BEACON:
936 case IEEE80211_FC0_SUBTYPE_ATIM:
937 case IEEE80211_FC0_SUBTYPE_DISASSOC:
938 case IEEE80211_FC0_SUBTYPE_AUTH:
939 case IEEE80211_FC0_SUBTYPE_DEAUTH:
940 case IEEE80211_FC0_SUBTYPE_ACTION:
941 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
942 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
943 wh, NULL, "%s", "not handled");
944 vap->iv_stats.is_rx_mgtdiscard++;
945 break;
946 default:
947 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
948 wh, "mgt", "subtype 0x%x not handled", subtype);
949 vap->iv_stats.is_rx_badsubtype++;
950 break;
951 }
952 }
953}
954
955static void
956adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
957{
958
959 switch (subtype) {
960 case IEEE80211_FC0_SUBTYPE_BAR:
961 ieee80211_recv_bar(ni, m);
962 break;
963 }
964}
| 418 uint8_t tid = ieee80211_gettid(wh);
419 if (IEEE80211_QOS_HAS_SEQ(wh) &&
420 TID_TO_WME_AC(tid) >= WME_AC_VI)
421 ic->ic_wme.wme_hipri_traffic++;
422 rxseq = le16toh(*(uint16_t *)wh->i_seq);
423 if (! ieee80211_check_rxseq(ni, wh)) {
424 /* duplicate, discard */
425 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
426 bssid, "duplicate",
427 "seqno <%u,%u> fragno <%u,%u> tid %u",
428 rxseq >> IEEE80211_SEQ_SEQ_SHIFT,
429 ni->ni_rxseqs[tid] >>
430 IEEE80211_SEQ_SEQ_SHIFT,
431 rxseq & IEEE80211_SEQ_FRAG_MASK,
432 ni->ni_rxseqs[tid] &
433 IEEE80211_SEQ_FRAG_MASK,
434 tid);
435 vap->iv_stats.is_rx_dup++;
436 IEEE80211_NODE_STAT(ni, rx_dup);
437 goto out;
438 }
439 ni->ni_rxseqs[tid] = rxseq;
440 }
441 }
442
443 switch (type) {
444 case IEEE80211_FC0_TYPE_DATA:
445 hdrspace = ieee80211_hdrspace(ic, wh);
446 if (m->m_len < hdrspace &&
447 (m = m_pullup(m, hdrspace)) == NULL) {
448 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
449 ni->ni_macaddr, NULL,
450 "data too short: expecting %u", hdrspace);
451 vap->iv_stats.is_rx_tooshort++;
452 goto out; /* XXX */
453 }
454 if (dir != IEEE80211_FC1_DIR_NODS) {
455 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
456 wh, "data", "incorrect dir 0x%x", dir);
457 vap->iv_stats.is_rx_wrongdir++;
458 goto out;
459 }
460 /* XXX no power-save support */
461
462 /*
463 * Handle A-MPDU re-ordering. If the frame is to be
464 * processed directly then ieee80211_ampdu_reorder
465 * will return 0; otherwise it has consumed the mbuf
466 * and we should do nothing more with it.
467 */
468 if ((m->m_flags & M_AMPDU) &&
469 ieee80211_ampdu_reorder(ni, m) != 0) {
470 m = NULL;
471 goto out;
472 }
473 resubmit_ampdu:
474
475 /*
476 * Handle privacy requirements. Note that we
477 * must not be preempted from here until after
478 * we (potentially) call ieee80211_crypto_demic;
479 * otherwise we may violate assumptions in the
480 * crypto cipher modules used to do delayed update
481 * of replay sequence numbers.
482 */
483 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
484 if ((vap->iv_flags & IEEE80211_F_PRIVACY) == 0) {
485 /*
486 * Discard encrypted frames when privacy is off.
487 */
488 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
489 wh, "WEP", "%s", "PRIVACY off");
490 vap->iv_stats.is_rx_noprivacy++;
491 IEEE80211_NODE_STAT(ni, rx_noprivacy);
492 goto out;
493 }
494 key = ieee80211_crypto_decap(ni, m, hdrspace);
495 if (key == NULL) {
496 /* NB: stats+msgs handled in crypto_decap */
497 IEEE80211_NODE_STAT(ni, rx_wepfail);
498 goto out;
499 }
500 wh = mtod(m, struct ieee80211_frame *);
501 wh->i_fc[1] &= ~IEEE80211_FC1_PROTECTED;
502 } else {
503 /* XXX M_WEP and IEEE80211_F_PRIVACY */
504 key = NULL;
505 }
506
507 /*
508 * Save QoS bits for use below--before we strip the header.
509 */
510 if (subtype == IEEE80211_FC0_SUBTYPE_QOS) {
511 qos = (dir == IEEE80211_FC1_DIR_DSTODS) ?
512 ((struct ieee80211_qosframe_addr4 *)wh)->i_qos[0] :
513 ((struct ieee80211_qosframe *)wh)->i_qos[0];
514 } else
515 qos = 0;
516
517 /*
518 * Next up, any fragmentation.
519 */
520 if (!IEEE80211_IS_MULTICAST(wh->i_addr1)) {
521 m = ieee80211_defrag(ni, m, hdrspace);
522 if (m == NULL) {
523 /* Fragment dropped or frame not complete yet */
524 goto out;
525 }
526 }
527 wh = NULL; /* no longer valid, catch any uses */
528
529 /*
530 * Next strip any MSDU crypto bits.
531 */
532 if (key != NULL && !ieee80211_crypto_demic(vap, key, m, 0)) {
533 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
534 ni->ni_macaddr, "data", "%s", "demic error");
535 vap->iv_stats.is_rx_demicfail++;
536 IEEE80211_NODE_STAT(ni, rx_demicfail);
537 goto out;
538 }
539
540 /* copy to listener after decrypt */
541 if (ieee80211_radiotap_active_vap(vap))
542 ieee80211_radiotap_rx(vap, m);
543 need_tap = 0;
544
545 /*
546 * Finally, strip the 802.11 header.
547 */
548 m = ieee80211_decap(vap, m, hdrspace);
549 if (m == NULL) {
550 /* XXX mask bit to check for both */
551 /* don't count Null data frames as errors */
552 if (subtype == IEEE80211_FC0_SUBTYPE_NODATA ||
553 subtype == IEEE80211_FC0_SUBTYPE_QOS_NULL)
554 goto out;
555 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
556 ni->ni_macaddr, "data", "%s", "decap error");
557 vap->iv_stats.is_rx_decap++;
558 IEEE80211_NODE_STAT(ni, rx_decap);
559 goto err;
560 }
561 eh = mtod(m, struct ether_header *);
562 if (!ieee80211_node_is_authorized(ni)) {
563 /*
564 * Deny any non-PAE frames received prior to
565 * authorization. For open/shared-key
566 * authentication the port is mark authorized
567 * after authentication completes. For 802.1x
568 * the port is not marked authorized by the
569 * authenticator until the handshake has completed.
570 */
571 if (eh->ether_type != htons(ETHERTYPE_PAE)) {
572 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_INPUT,
573 eh->ether_shost, "data",
574 "unauthorized port: ether type 0x%x len %u",
575 eh->ether_type, m->m_pkthdr.len);
576 vap->iv_stats.is_rx_unauth++;
577 IEEE80211_NODE_STAT(ni, rx_unauth);
578 goto err;
579 }
580 } else {
581 /*
582 * When denying unencrypted frames, discard
583 * any non-PAE frames received without encryption.
584 */
585 if ((vap->iv_flags & IEEE80211_F_DROPUNENC) &&
586 (key == NULL && (m->m_flags & M_WEP) == 0) &&
587 eh->ether_type != htons(ETHERTYPE_PAE)) {
588 /*
589 * Drop unencrypted frames.
590 */
591 vap->iv_stats.is_rx_unencrypted++;
592 IEEE80211_NODE_STAT(ni, rx_unencrypted);
593 goto out;
594 }
595 }
596 /* XXX require HT? */
597 if (qos & IEEE80211_QOS_AMSDU) {
598 m = ieee80211_decap_amsdu(ni, m);
599 if (m == NULL)
600 return IEEE80211_FC0_TYPE_DATA;
601 } else {
602#ifdef IEEE80211_SUPPORT_SUPERG
603 m = ieee80211_decap_fastframe(vap, ni, m);
604 if (m == NULL)
605 return IEEE80211_FC0_TYPE_DATA;
606#endif
607 }
608 if (dir == IEEE80211_FC1_DIR_DSTODS && ni->ni_wdsvap != NULL)
609 ieee80211_deliver_data(ni->ni_wdsvap, ni, m);
610 else
611 ieee80211_deliver_data(vap, ni, m);
612 return IEEE80211_FC0_TYPE_DATA;
613
614 case IEEE80211_FC0_TYPE_MGT:
615 vap->iv_stats.is_rx_mgmt++;
616 IEEE80211_NODE_STAT(ni, rx_mgmt);
617 if (dir != IEEE80211_FC1_DIR_NODS) {
618 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
619 wh, "data", "incorrect dir 0x%x", dir);
620 vap->iv_stats.is_rx_wrongdir++;
621 goto err;
622 }
623 if (m->m_pkthdr.len < sizeof(struct ieee80211_frame)) {
624 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
625 ni->ni_macaddr, "mgt", "too short: len %u",
626 m->m_pkthdr.len);
627 vap->iv_stats.is_rx_tooshort++;
628 goto out;
629 }
630#ifdef IEEE80211_DEBUG
631 if ((ieee80211_msg_debug(vap) && doprint(vap, subtype)) ||
632 ieee80211_msg_dumppkts(vap)) {
633 if_printf(ifp, "received %s from %s rssi %d\n",
634 ieee80211_mgt_subtype_name[subtype >>
635 IEEE80211_FC0_SUBTYPE_SHIFT],
636 ether_sprintf(wh->i_addr2), rssi);
637 }
638#endif
639 if (wh->i_fc[1] & IEEE80211_FC1_PROTECTED) {
640 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
641 wh, NULL, "%s", "WEP set but not permitted");
642 vap->iv_stats.is_rx_mgtdiscard++; /* XXX */
643 goto out;
644 }
645 vap->iv_recv_mgmt(ni, m, subtype, rssi, nf);
646 goto out;
647
648 case IEEE80211_FC0_TYPE_CTL:
649 vap->iv_stats.is_rx_ctl++;
650 IEEE80211_NODE_STAT(ni, rx_ctrl);
651 vap->iv_recv_ctl(ni, m, subtype);
652 goto out;
653
654 default:
655 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
656 wh, "bad", "frame type 0x%x", type);
657 /* should not come here */
658 break;
659 }
660err:
661 if_inc_counter(ifp, IFCOUNTER_IERRORS, 1);
662out:
663 if (m != NULL) {
664 if (need_tap && ieee80211_radiotap_active_vap(vap))
665 ieee80211_radiotap_rx(vap, m);
666 m_freem(m);
667 }
668 return type;
669}
670
671static int
672is11bclient(const uint8_t *rates, const uint8_t *xrates)
673{
674 static const uint32_t brates = (1<<2*1)|(1<<2*2)|(1<<11)|(1<<2*11);
675 int i;
676
677 /* NB: the 11b clients we care about will not have xrates */
678 if (xrates != NULL || rates == NULL)
679 return 0;
680 for (i = 0; i < rates[1]; i++) {
681 int r = rates[2+i] & IEEE80211_RATE_VAL;
682 if (r > 2*11 || ((1<<r) & brates) == 0)
683 return 0;
684 }
685 return 1;
686}
687
688static void
689adhoc_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
690 int subtype, int rssi, int nf)
691{
692 struct ieee80211vap *vap = ni->ni_vap;
693 struct ieee80211com *ic = ni->ni_ic;
694 struct ieee80211_frame *wh;
695 uint8_t *frm, *efrm, *sfrm;
696 uint8_t *ssid, *rates, *xrates;
697#if 0
698 int ht_state_change = 0;
699#endif
700
701 wh = mtod(m0, struct ieee80211_frame *);
702 frm = (uint8_t *)&wh[1];
703 efrm = mtod(m0, uint8_t *) + m0->m_len;
704 switch (subtype) {
705 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
706 case IEEE80211_FC0_SUBTYPE_BEACON: {
707 struct ieee80211_scanparams scan;
708 /*
709 * We process beacon/probe response
710 * frames to discover neighbors.
711 */
712 if (ieee80211_parse_beacon(ni, m0, &scan) != 0)
713 return;
714 /*
715 * Count frame now that we know it's to be processed.
716 */
717 if (subtype == IEEE80211_FC0_SUBTYPE_BEACON) {
718 vap->iv_stats.is_rx_beacon++; /* XXX remove */
719 IEEE80211_NODE_STAT(ni, rx_beacons);
720 } else
721 IEEE80211_NODE_STAT(ni, rx_proberesp);
722 /*
723 * If scanning, just pass information to the scan module.
724 */
725 if (ic->ic_flags & IEEE80211_F_SCAN) {
726 if (ic->ic_flags_ext & IEEE80211_FEXT_PROBECHAN) {
727 /*
728 * Actively scanning a channel marked passive;
729 * send a probe request now that we know there
730 * is 802.11 traffic present.
731 *
732 * XXX check if the beacon we recv'd gives
733 * us what we need and suppress the probe req
734 */
735 ieee80211_probe_curchan(vap, 1);
736 ic->ic_flags_ext &= ~IEEE80211_FEXT_PROBECHAN;
737 }
738 ieee80211_add_scan(vap, ic->ic_curchan, &scan, wh,
739 subtype, rssi, nf);
740 return;
741 }
742 if (scan.capinfo & IEEE80211_CAPINFO_IBSS) {
743 if (!IEEE80211_ADDR_EQ(wh->i_addr2, ni->ni_macaddr)) {
744 /*
745 * Create a new entry in the neighbor table.
746 */
747 ni = ieee80211_add_neighbor(vap, wh, &scan);
748 } else if (ni->ni_capinfo == 0) {
749 /*
750 * Update faked node created on transmit.
751 * Note this also updates the tsf.
752 */
753 ieee80211_init_neighbor(ni, wh, &scan);
754 } else {
755 /*
756 * Record tsf for potential resync.
757 */
758 memcpy(ni->ni_tstamp.data, scan.tstamp,
759 sizeof(ni->ni_tstamp));
760 }
761 /*
762 * This isn't enabled yet - otherwise it would
763 * update the HT parameters and channel width
764 * from any node, which could lead to lots of
765 * strange behaviour if the 11n nodes aren't
766 * exactly configured to match.
767 */
768#if 0
769 if (scan.htcap != NULL && scan.htinfo != NULL &&
770 (vap->iv_flags_ht & IEEE80211_FHT_HT)) {
771 if (ieee80211_ht_updateparams(ni,
772 scan.htcap, scan.htinfo))
773 ht_state_change = 1;
774 }
775#endif
776 if (ni != NULL) {
777 IEEE80211_RSSI_LPF(ni->ni_avgrssi, rssi);
778 ni->ni_noise = nf;
779 }
780 /*
781 * Same here - the channel width change should
782 * be applied to the specific peer node, not
783 * to the ic. Ie, the interface configuration
784 * should stay in its current channel width;
785 * but it should change the rate control and
786 * any queued frames for the given node only.
787 *
788 * Since there's no (current) way to inform
789 * the driver that a channel width change has
790 * occured for a single node, just stub this
791 * out.
792 */
793#if 0
794 if (ht_state_change)
795 ieee80211_update_chw(ic);
796#endif
797 }
798 break;
799 }
800
801 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
802 if (vap->iv_state != IEEE80211_S_RUN) {
803 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
804 wh, NULL, "wrong state %s",
805 ieee80211_state_name[vap->iv_state]);
806 vap->iv_stats.is_rx_mgtdiscard++;
807 return;
808 }
809 if (IEEE80211_IS_MULTICAST(wh->i_addr2)) {
810 /* frame must be directed */
811 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
812 wh, NULL, "%s", "not unicast");
813 vap->iv_stats.is_rx_mgtdiscard++; /* XXX stat */
814 return;
815 }
816
817 /*
818 * prreq frame format
819 * [tlv] ssid
820 * [tlv] supported rates
821 * [tlv] extended supported rates
822 */
823 ssid = rates = xrates = NULL;
824 sfrm = frm;
825 while (efrm - frm > 1) {
826 IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
827 switch (*frm) {
828 case IEEE80211_ELEMID_SSID:
829 ssid = frm;
830 break;
831 case IEEE80211_ELEMID_RATES:
832 rates = frm;
833 break;
834 case IEEE80211_ELEMID_XRATES:
835 xrates = frm;
836 break;
837 }
838 frm += frm[1] + 2;
839 }
840 IEEE80211_VERIFY_ELEMENT(rates, IEEE80211_RATE_MAXSIZE, return);
841 if (xrates != NULL)
842 IEEE80211_VERIFY_ELEMENT(xrates,
843 IEEE80211_RATE_MAXSIZE - rates[1], return);
844 IEEE80211_VERIFY_ELEMENT(ssid, IEEE80211_NWID_LEN, return);
845 IEEE80211_VERIFY_SSID(vap->iv_bss, ssid, return);
846 if ((vap->iv_flags & IEEE80211_F_HIDESSID) && ssid[1] == 0) {
847 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
848 wh, NULL,
849 "%s", "no ssid with ssid suppression enabled");
850 vap->iv_stats.is_rx_ssidmismatch++; /*XXX*/
851 return;
852 }
853
854 /* XXX find a better class or define it's own */
855 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_INPUT, wh->i_addr2,
856 "%s", "recv probe req");
857 /*
858 * Some legacy 11b clients cannot hack a complete
859 * probe response frame. When the request includes
860 * only a bare-bones rate set, communicate this to
861 * the transmit side.
862 */
863 ieee80211_send_proberesp(vap, wh->i_addr2,
864 is11bclient(rates, xrates) ? IEEE80211_SEND_LEGACY_11B : 0);
865 break;
866
867 case IEEE80211_FC0_SUBTYPE_ACTION:
868 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
869 if (ni == vap->iv_bss) {
870 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
871 wh, NULL, "%s", "unknown node");
872 vap->iv_stats.is_rx_mgtdiscard++;
873 } else if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, wh->i_addr1) &&
874 !IEEE80211_IS_MULTICAST(wh->i_addr1)) {
875 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
876 wh, NULL, "%s", "not for us");
877 vap->iv_stats.is_rx_mgtdiscard++;
878 } else if (vap->iv_state != IEEE80211_S_RUN) {
879 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
880 wh, NULL, "wrong state %s",
881 ieee80211_state_name[vap->iv_state]);
882 vap->iv_stats.is_rx_mgtdiscard++;
883 } else {
884 if (ieee80211_parse_action(ni, m0) == 0)
885 (void)ic->ic_recv_action(ni, wh, frm, efrm);
886 }
887 break;
888
889 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
890 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
891 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
892 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
893 case IEEE80211_FC0_SUBTYPE_ATIM:
894 case IEEE80211_FC0_SUBTYPE_DISASSOC:
895 case IEEE80211_FC0_SUBTYPE_AUTH:
896 case IEEE80211_FC0_SUBTYPE_DEAUTH:
897 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
898 wh, NULL, "%s", "not handled");
899 vap->iv_stats.is_rx_mgtdiscard++;
900 break;
901
902 default:
903 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
904 wh, "mgt", "subtype 0x%x not handled", subtype);
905 vap->iv_stats.is_rx_badsubtype++;
906 break;
907 }
908}
909#undef IEEE80211_VERIFY_LENGTH
910#undef IEEE80211_VERIFY_ELEMENT
911
912static void
913ahdemo_recv_mgmt(struct ieee80211_node *ni, struct mbuf *m0,
914 int subtype, int rssi, int nf)
915{
916 struct ieee80211vap *vap = ni->ni_vap;
917 struct ieee80211com *ic = ni->ni_ic;
918 struct ieee80211_frame *wh;
919
920 /*
921 * Process management frames when scanning; useful for doing
922 * a site-survey.
923 */
924 if (ic->ic_flags & IEEE80211_F_SCAN)
925 adhoc_recv_mgmt(ni, m0, subtype, rssi, nf);
926 else {
927 wh = mtod(m0, struct ieee80211_frame *);
928 switch (subtype) {
929 case IEEE80211_FC0_SUBTYPE_ASSOC_REQ:
930 case IEEE80211_FC0_SUBTYPE_ASSOC_RESP:
931 case IEEE80211_FC0_SUBTYPE_REASSOC_REQ:
932 case IEEE80211_FC0_SUBTYPE_REASSOC_RESP:
933 case IEEE80211_FC0_SUBTYPE_PROBE_REQ:
934 case IEEE80211_FC0_SUBTYPE_PROBE_RESP:
935 case IEEE80211_FC0_SUBTYPE_BEACON:
936 case IEEE80211_FC0_SUBTYPE_ATIM:
937 case IEEE80211_FC0_SUBTYPE_DISASSOC:
938 case IEEE80211_FC0_SUBTYPE_AUTH:
939 case IEEE80211_FC0_SUBTYPE_DEAUTH:
940 case IEEE80211_FC0_SUBTYPE_ACTION:
941 case IEEE80211_FC0_SUBTYPE_ACTION_NOACK:
942 IEEE80211_DISCARD(vap, IEEE80211_MSG_INPUT,
943 wh, NULL, "%s", "not handled");
944 vap->iv_stats.is_rx_mgtdiscard++;
945 break;
946 default:
947 IEEE80211_DISCARD(vap, IEEE80211_MSG_ANY,
948 wh, "mgt", "subtype 0x%x not handled", subtype);
949 vap->iv_stats.is_rx_badsubtype++;
950 break;
951 }
952 }
953}
954
955static void
956adhoc_recv_ctl(struct ieee80211_node *ni, struct mbuf *m, int subtype)
957{
958
959 switch (subtype) {
960 case IEEE80211_FC0_SUBTYPE_BAR:
961 ieee80211_recv_bar(ni, m);
962 break;
963 }
964}
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