1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2009 The FreeBSD Foundation
5 * All rights reserved.
6 *
7 * This software was developed by Rui Paulo under sponsorship from the
8 * FreeBSD Foundation.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31 #include <sys/cdefs.h>
32 #ifdef __FreeBSD__
33 __FBSDID("$FreeBSD$");
34 #endif
35
36 /*
37 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP.
38 *
39 * Based on March 2009, D3.0 802.11s draft spec.
40 */
41 #include "opt_inet.h"
42 #include "opt_wlan.h"
43
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/mbuf.h>
47 #include <sys/malloc.h>
48 #include <sys/kernel.h>
49
50 #include <sys/socket.h>
51 #include <sys/sockio.h>
52 #include <sys/endian.h>
53 #include <sys/errno.h>
54 #include <sys/proc.h>
55 #include <sys/sysctl.h>
56
57 #include <net/if.h>
58 #include <net/if_media.h>
59 #include <net/if_llc.h>
60 #include <net/ethernet.h>
61
62 #include <net/bpf.h>
63
64 #include <net80211/ieee80211_var.h>
65 #include <net80211/ieee80211_action.h>
66 #include <net80211/ieee80211_input.h>
67 #include <net80211/ieee80211_mesh.h>
68
69 static void hwmp_vattach(struct ieee80211vap *);
70 static void hwmp_vdetach(struct ieee80211vap *);
71 static int hwmp_newstate(struct ieee80211vap *,
72 enum ieee80211_state, int);
73 static int hwmp_send_action(struct ieee80211vap *,
74 const uint8_t [IEEE80211_ADDR_LEN],
75 uint8_t *, size_t);
76 static uint8_t * hwmp_add_meshpreq(uint8_t *,
77 const struct ieee80211_meshpreq_ie *);
78 static uint8_t * hwmp_add_meshprep(uint8_t *,
79 const struct ieee80211_meshprep_ie *);
80 static uint8_t * hwmp_add_meshperr(uint8_t *,
81 const struct ieee80211_meshperr_ie *);
82 static uint8_t * hwmp_add_meshrann(uint8_t *,
83 const struct ieee80211_meshrann_ie *);
84 static void hwmp_rootmode_setup(struct ieee80211vap *);
85 static void hwmp_rootmode_cb(void *);
86 static void hwmp_rootmode_rann_cb(void *);
87 static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
88 const struct ieee80211_frame *,
89 const struct ieee80211_meshpreq_ie *);
90 static int hwmp_send_preq(struct ieee80211vap *,
91 const uint8_t [IEEE80211_ADDR_LEN],
92 struct ieee80211_meshpreq_ie *,
93 struct timeval *, struct timeval *);
94 static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
95 const struct ieee80211_frame *,
96 const struct ieee80211_meshprep_ie *);
97 static int hwmp_send_prep(struct ieee80211vap *,
98 const uint8_t [IEEE80211_ADDR_LEN],
99 struct ieee80211_meshprep_ie *);
100 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
101 const struct ieee80211_frame *,
102 const struct ieee80211_meshperr_ie *);
103 static int hwmp_send_perr(struct ieee80211vap *,
104 const uint8_t [IEEE80211_ADDR_LEN],
105 struct ieee80211_meshperr_ie *);
106 static void hwmp_senderror(struct ieee80211vap *,
107 const uint8_t [IEEE80211_ADDR_LEN],
108 struct ieee80211_mesh_route *, int);
109 static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
110 const struct ieee80211_frame *,
111 const struct ieee80211_meshrann_ie *);
112 static int hwmp_send_rann(struct ieee80211vap *,
113 const uint8_t [IEEE80211_ADDR_LEN],
114 struct ieee80211_meshrann_ie *);
115 static struct ieee80211_node *
116 hwmp_discover(struct ieee80211vap *,
117 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
118 static void hwmp_peerdown(struct ieee80211_node *);
119
120 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
121 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
122
123
124 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
125 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] =
126 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
127
128 typedef uint32_t ieee80211_hwmp_seq;
129 #define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0)
130 #define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0)
131 #define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0)
132 #define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0)
133
134 #define HWMP_SEQ_MAX(a, b) (a > b ? a : b)
135
136 /*
137 * Private extension of ieee80211_mesh_route.
138 */
139 struct ieee80211_hwmp_route {
140 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/
141 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */
142 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/
143 struct timeval hr_lastpreq; /* last time we sent a PREQ */
144 struct timeval hr_lastrootconf; /* last sent PREQ root conf */
145 int hr_preqretries; /* number of discoveries */
146 int hr_lastdiscovery; /* last discovery in ticks */
147 };
148 struct ieee80211_hwmp_state {
149 ieee80211_hwmp_seq hs_seq; /* next seq to be used */
150 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */
151 int hs_rootmode; /* proactive HWMP */
152 struct timeval hs_lastperr; /* last time we sent a PERR */
153 struct callout hs_roottimer;
154 uint8_t hs_maxhops; /* max hop count */
155 };
156
157 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
158 "IEEE 802.11s HWMP parameters");
159 static int ieee80211_hwmp_targetonly = 0;
160 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW,
161 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
162 static int ieee80211_hwmp_pathtimeout = -1;
163 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
164 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
165 "path entry lifetime (ms)");
166 static int ieee80211_hwmp_maxpreq_retries = -1;
167 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW,
168 &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I",
169 "maximum number of preq retries");
170 static int ieee80211_hwmp_net_diameter_traversaltime = -1;
171 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time,
172 CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0,
173 ieee80211_sysctl_msecs_ticks, "I",
174 "estimate traversal time across the MBSS (ms)");
175 static int ieee80211_hwmp_roottimeout = -1;
176 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
177 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
178 "root PREQ timeout (ms)");
179 static int ieee80211_hwmp_rootint = -1;
180 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
181 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
182 "root interval (ms)");
183 static int ieee80211_hwmp_rannint = -1;
184 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
185 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
186 "root announcement interval (ms)");
187 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 };
188 static int ieee80211_hwmp_rootconfint_internal = -1;
189 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD,
190 &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I",
191 "root confirmation interval (ms) (read-only)");
192
193 #define IEEE80211_HWMP_DEFAULT_MAXHOPS 31
194
195 static ieee80211_recv_action_func hwmp_recv_action_meshpath;
196
197 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
198 .mpp_descr = "HWMP",
199 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP,
200 .mpp_discover = hwmp_discover,
201 .mpp_peerdown = hwmp_peerdown,
202 .mpp_senderror = hwmp_senderror,
203 .mpp_vattach = hwmp_vattach,
204 .mpp_vdetach = hwmp_vdetach,
205 .mpp_newstate = hwmp_newstate,
206 .mpp_privlen = sizeof(struct ieee80211_hwmp_route),
207 };
208 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
209 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
210 "mesh route inactivity timeout (ms)");
211
212
213 static void
214 ieee80211_hwmp_init(void)
215 {
216 /* Default values as per amendment */
217 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
218 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
219 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
220 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
221 ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000);
222 ieee80211_hwmp_maxpreq_retries = 3;
223 /*
224 * (TU): A measurement of time equal to 1024 μs,
225 * 500 TU is 512 ms.
226 */
227 ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512);
228
229 /*
230 * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks
231 * and return a struct timeval...
232 */
233 ieee80211_hwmp_rootconfint.tv_usec =
234 ieee80211_hwmp_rootconfint_internal * 1000;
235
236 /*
237 * Register action frame handler.
238 */
239 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH,
240 IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath);
241
242 /* NB: default is 5 secs per spec */
243 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
244
245 /*
246 * Register HWMP.
247 */
248 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
249 }
250 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
251
252 static void
253 hwmp_vattach(struct ieee80211vap *vap)
254 {
255 struct ieee80211_hwmp_state *hs;
256
257 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
258 ("not a mesh vap, opmode %d", vap->iv_opmode));
259
260 hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
261 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
262 if (hs == NULL) {
263 printf("%s: couldn't alloc HWMP state\n", __func__);
264 return;
265 }
266 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
267 callout_init(&hs->hs_roottimer, 1);
268 vap->iv_hwmp = hs;
269 }
270
271 static void
272 hwmp_vdetach(struct ieee80211vap *vap)
273 {
274 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
275
276 callout_drain(&hs->hs_roottimer);
277 IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP);
278 vap->iv_hwmp = NULL;
279 }
280
281 static int
282 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
283 {
284 enum ieee80211_state nstate = vap->iv_state;
285 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
286
287 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
288 __func__, ieee80211_state_name[ostate],
289 ieee80211_state_name[nstate], arg);
290
291 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
292 callout_drain(&hs->hs_roottimer);
293 if (nstate == IEEE80211_S_RUN)
294 hwmp_rootmode_setup(vap);
295 return 0;
296 }
297
298 /*
299 * Verify the length of an HWMP PREQ and return the number
300 * of destinations >= 1, if verification fails -1 is returned.
301 */
302 static int
303 verify_mesh_preq_len(struct ieee80211vap *vap,
304 const struct ieee80211_frame *wh, const uint8_t *iefrm)
305 {
306 int alloc_sz = -1;
307 int ndest = -1;
308 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
309 /* Originator External Address present */
310 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE;
311 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
312 } else {
313 /* w/o Originator External Address */
314 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ;
315 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
316 }
317 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
318
319 if(iefrm[1] != (alloc_sz)) {
320 IEEE80211_DISCARD(vap,
321 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
322 wh, NULL, "PREQ (AE=%s) with wrong len",
323 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "");
324 return (-1);
325 }
326 return ndest;
327 }
328
329 /*
330 * Verify the length of an HWMP PREP and returns 1 on success,
331 * otherwise -1.
332 */
333 static int
334 verify_mesh_prep_len(struct ieee80211vap *vap,
335 const struct ieee80211_frame *wh, const uint8_t *iefrm)
336 {
337 int alloc_sz = -1;
338 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
339 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
340 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
341 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
342 alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
343 if(alloc_sz < 0) {
344 IEEE80211_DISCARD(vap,
345 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
346 wh, NULL, "PREP (AE=%s) with wrong len",
347 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "");
348 return (-1);
349 }
350 return (1);
351 }
352
353 /*
354 * Verify the length of an HWMP PERR and return the number
355 * of destinations >= 1, if verification fails -1 is returned.
356 */
357 static int
358 verify_mesh_perr_len(struct ieee80211vap *vap,
359 const struct ieee80211_frame *wh, const uint8_t *iefrm)
360 {
361 int alloc_sz = -1;
362 const uint8_t *iefrm_t = iefrm;
363 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
364 int i;
365
366 if(ndest > IEEE80211_MESHPERR_MAXDEST) {
367 IEEE80211_DISCARD(vap,
368 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
369 wh, NULL, "PERR with wrong number of destionat (>19), %u",
370 ndest);
371 return (-1);
372 }
373
374 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
375 /* We need to check each destination flag to know size */
376 for(i = 0; i<ndest; i++) {
377 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
378 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
379 else
380 iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
381 }
382
383 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
384 if(alloc_sz != iefrm[1]) {
385 IEEE80211_DISCARD(vap,
386 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
387 wh, NULL, "%s", "PERR with wrong len");
388 return (-1);
389 }
390 return ndest;
391 }
392
393 static int
394 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
395 const struct ieee80211_frame *wh,
396 const uint8_t *frm, const uint8_t *efrm)
397 {
398 struct ieee80211vap *vap = ni->ni_vap;
399 struct ieee80211_meshpreq_ie *preq;
400 struct ieee80211_meshprep_ie *prep;
401 struct ieee80211_meshperr_ie *perr;
402 struct ieee80211_meshrann_ie rann;
403 const uint8_t *iefrm = frm + 2; /* action + code */
404 const uint8_t *iefrm_t = iefrm; /* temporary pointer */
405 int ndest = -1;
406 int found = 0;
407
408 while (efrm - iefrm > 1) {
409 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
410 switch (*iefrm) {
411 case IEEE80211_ELEMID_MESHPREQ:
412 {
413 int i = 0;
414
415 iefrm_t = iefrm;
416 ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
417 if (ndest < 0) {
418 vap->iv_stats.is_rx_mgtdiscard++;
419 break;
420 }
421 preq = IEEE80211_MALLOC(sizeof(*preq) +
422 (ndest - 1) * sizeof(*preq->preq_targets),
423 M_80211_MESH_PREQ,
424 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
425 KASSERT(preq != NULL, ("preq == NULL"));
426
427 preq->preq_ie = *iefrm_t++;
428 preq->preq_len = *iefrm_t++;
429 preq->preq_flags = *iefrm_t++;
430 preq->preq_hopcount = *iefrm_t++;
431 preq->preq_ttl = *iefrm_t++;
432 preq->preq_id = le32dec(iefrm_t); iefrm_t += 4;
433 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
434 iefrm_t += 6;
435 preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4;
436 /* NB: may have Originator Proxied Address */
437 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
438 IEEE80211_ADDR_COPY(
439 preq->preq_orig_ext_addr, iefrm_t);
440 iefrm_t += 6;
441 }
442 preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4;
443 preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4;
444 preq->preq_tcount = *iefrm_t++;
445
446 for (i = 0; i < preq->preq_tcount; i++) {
447 preq->preq_targets[i].target_flags = *iefrm_t++;
448 IEEE80211_ADDR_COPY(
449 preq->preq_targets[i].target_addr, iefrm_t);
450 iefrm_t += 6;
451 preq->preq_targets[i].target_seq =
452 le32dec(iefrm_t);
453 iefrm_t += 4;
454 }
455
456 hwmp_recv_preq(vap, ni, wh, preq);
457 IEEE80211_FREE(preq, M_80211_MESH_PREQ);
458 found++;
459 break;
460 }
461 case IEEE80211_ELEMID_MESHPREP:
462 {
463 iefrm_t = iefrm;
464 ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
465 if (ndest < 0) {
466 vap->iv_stats.is_rx_mgtdiscard++;
467 break;
468 }
469 prep = IEEE80211_MALLOC(sizeof(*prep),
470 M_80211_MESH_PREP,
471 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
472 KASSERT(prep != NULL, ("prep == NULL"));
473
474 prep->prep_ie = *iefrm_t++;
475 prep->prep_len = *iefrm_t++;
476 prep->prep_flags = *iefrm_t++;
477 prep->prep_hopcount = *iefrm_t++;
478 prep->prep_ttl = *iefrm_t++;
479 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
480 iefrm_t += 6;
481 prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4;
482 /* NB: May have Target Proxied Address */
483 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
484 IEEE80211_ADDR_COPY(
485 prep->prep_target_ext_addr, iefrm_t);
486 iefrm_t += 6;
487 }
488 prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4;
489 prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4;
490 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
491 iefrm_t += 6;
492 prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4;
493
494 hwmp_recv_prep(vap, ni, wh, prep);
495 IEEE80211_FREE(prep, M_80211_MESH_PREP);
496 found++;
497 break;
498 }
499 case IEEE80211_ELEMID_MESHPERR:
500 {
501 int i = 0;
502
503 iefrm_t = iefrm;
504 ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
505 if (ndest < 0) {
506 vap->iv_stats.is_rx_mgtdiscard++;
507 break;
508 }
509 perr = IEEE80211_MALLOC(sizeof(*perr) +
510 (ndest - 1) * sizeof(*perr->perr_dests),
511 M_80211_MESH_PERR,
512 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
513 KASSERT(perr != NULL, ("perr == NULL"));
514
515 perr->perr_ie = *iefrm_t++;
516 perr->perr_len = *iefrm_t++;
517 perr->perr_ttl = *iefrm_t++;
518 perr->perr_ndests = *iefrm_t++;
519
520 for (i = 0; i<perr->perr_ndests; i++) {
521 perr->perr_dests[i].dest_flags = *iefrm_t++;
522 IEEE80211_ADDR_COPY(
523 perr->perr_dests[i].dest_addr, iefrm_t);
524 iefrm_t += 6;
525 perr->perr_dests[i].dest_seq = le32dec(iefrm_t);
526 iefrm_t += 4;
527 /* NB: May have Target Proxied Address */
528 if (perr->perr_dests[i].dest_flags &
529 IEEE80211_MESHPERR_FLAGS_AE) {
530 IEEE80211_ADDR_COPY(
531 perr->perr_dests[i].dest_ext_addr,
532 iefrm_t);
533 iefrm_t += 6;
534 }
535 perr->perr_dests[i].dest_rcode =
536 le16dec(iefrm_t);
537 iefrm_t += 2;
538 }
539
540 hwmp_recv_perr(vap, ni, wh, perr);
541 IEEE80211_FREE(perr, M_80211_MESH_PERR);
542 found++;
543 break;
544 }
545 case IEEE80211_ELEMID_MESHRANN:
546 {
547 const struct ieee80211_meshrann_ie *mrann =
548 (const struct ieee80211_meshrann_ie *) iefrm;
549 if (mrann->rann_len !=
550 sizeof(struct ieee80211_meshrann_ie) - 2) {
551 IEEE80211_DISCARD(vap,
552 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
553 wh, NULL, "%s", "RAN with wrong len");
554 vap->iv_stats.is_rx_mgtdiscard++;
555 return 1;
556 }
557 memcpy(&rann, mrann, sizeof(rann));
558 rann.rann_seq = le32dec(&mrann->rann_seq);
559 rann.rann_interval = le32dec(&mrann->rann_interval);
560 rann.rann_metric = le32dec(&mrann->rann_metric);
561 hwmp_recv_rann(vap, ni, wh, &rann);
562 found++;
563 break;
564 }
565 }
566 iefrm += iefrm[1] + 2;
567 }
568 if (!found) {
569 IEEE80211_DISCARD(vap,
570 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
571 wh, NULL, "%s", "PATH SEL action without IE");
572 vap->iv_stats.is_rx_mgtdiscard++;
573 }
574 return 0;
575 }
576
577 static int
578 hwmp_send_action(struct ieee80211vap *vap,
579 const uint8_t da[IEEE80211_ADDR_LEN],
580 uint8_t *ie, size_t len)
581 {
582 struct ieee80211_node *ni;
583 struct ieee80211com *ic;
584 struct ieee80211_bpf_params params;
585 struct mbuf *m;
586 uint8_t *frm;
587 int ret;
588
589 if (IEEE80211_IS_MULTICAST(da)) {
590 ni = ieee80211_ref_node(vap->iv_bss);
591 #ifdef IEEE80211_DEBUG_REFCNT
592 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
593 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
594 __func__, __LINE__,
595 ni, ether_sprintf(ni->ni_macaddr),
596 ieee80211_node_refcnt(ni)+1);
597 #endif
598 ieee80211_ref_node(ni);
599 }
600 else
601 ni = ieee80211_mesh_find_txnode(vap, da);
602
603 if (vap->iv_state == IEEE80211_S_CAC) {
604 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
605 "block %s frame in CAC state", "HWMP action");
606 vap->iv_stats.is_tx_badstate++;
607 return EIO; /* XXX */
608 }
609
610 KASSERT(ni != NULL, ("null node"));
611 ic = ni->ni_ic;
612
613 m = ieee80211_getmgtframe(&frm,
614 ic->ic_headroom + sizeof(struct ieee80211_frame),
615 sizeof(struct ieee80211_action) + len
616 );
617 if (m == NULL) {
618 ieee80211_free_node(ni);
619 vap->iv_stats.is_tx_nobuf++;
620 return ENOMEM;
621 }
622 *frm++ = IEEE80211_ACTION_CAT_MESH;
623 *frm++ = IEEE80211_ACTION_MESH_HWMP;
624 switch (*ie) {
625 case IEEE80211_ELEMID_MESHPREQ:
626 frm = hwmp_add_meshpreq(frm,
627 (struct ieee80211_meshpreq_ie *)ie);
628 break;
629 case IEEE80211_ELEMID_MESHPREP:
630 frm = hwmp_add_meshprep(frm,
631 (struct ieee80211_meshprep_ie *)ie);
632 break;
633 case IEEE80211_ELEMID_MESHPERR:
634 frm = hwmp_add_meshperr(frm,
635 (struct ieee80211_meshperr_ie *)ie);
636 break;
637 case IEEE80211_ELEMID_MESHRANN:
638 frm = hwmp_add_meshrann(frm,
639 (struct ieee80211_meshrann_ie *)ie);
640 break;
641 }
642
643 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
644 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
645 if (m == NULL) {
646 ieee80211_free_node(ni);
647 vap->iv_stats.is_tx_nobuf++;
648 return ENOMEM;
649 }
650
651 IEEE80211_TX_LOCK(ic);
652
653 ieee80211_send_setup(ni, m,
654 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
655 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr);
656
657 m->m_flags |= M_ENCAP; /* mark encapsulated */
658 IEEE80211_NODE_STAT(ni, tx_mgmt);
659
660 memset(¶ms, 0, sizeof(params));
661 params.ibp_pri = WME_AC_VO;
662 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
663 if (IEEE80211_IS_MULTICAST(da))
664 params.ibp_try0 = 1;
665 else
666 params.ibp_try0 = ni->ni_txparms->maxretry;
667 params.ibp_power = ni->ni_txpower;
668 ret = ieee80211_raw_output(vap, ni, m, ¶ms);
669 IEEE80211_TX_UNLOCK(ic);
670 return (ret);
671 }
672
673 #define ADDSHORT(frm, v) do { \
674 le16enc(frm, v); \
675 frm += 2; \
676 } while (0)
677 #define ADDWORD(frm, v) do { \
678 le32enc(frm, v); \
679 frm += 4; \
680 } while (0)
681 /*
682 * Add a Mesh Path Request IE to a frame.
683 */
684 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
685 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
686 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
687 static uint8_t *
688 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
689 {
690 int i;
691
692 *frm++ = IEEE80211_ELEMID_MESHPREQ;
693 *frm++ = preq->preq_len; /* len already calculated */
694 *frm++ = preq->preq_flags;
695 *frm++ = preq->preq_hopcount;
696 *frm++ = preq->preq_ttl;
697 ADDWORD(frm, preq->preq_id);
698 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
699 ADDWORD(frm, preq->preq_origseq);
700 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
701 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
702 frm += 6;
703 }
704 ADDWORD(frm, preq->preq_lifetime);
705 ADDWORD(frm, preq->preq_metric);
706 *frm++ = preq->preq_tcount;
707 for (i = 0; i < preq->preq_tcount; i++) {
708 *frm++ = PREQ_TFLAGS(i);
709 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
710 frm += 6;
711 ADDWORD(frm, PREQ_TSEQ(i));
712 }
713 return frm;
714 }
715 #undef PREQ_TFLAGS
716 #undef PREQ_TADDR
717 #undef PREQ_TSEQ
718
719 /*
720 * Add a Mesh Path Reply IE to a frame.
721 */
722 static uint8_t *
723 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
724 {
725 *frm++ = IEEE80211_ELEMID_MESHPREP;
726 *frm++ = prep->prep_len; /* len already calculated */
727 *frm++ = prep->prep_flags;
728 *frm++ = prep->prep_hopcount;
729 *frm++ = prep->prep_ttl;
730 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
731 ADDWORD(frm, prep->prep_targetseq);
732 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
733 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
734 frm += 6;
735 }
736 ADDWORD(frm, prep->prep_lifetime);
737 ADDWORD(frm, prep->prep_metric);
738 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
739 ADDWORD(frm, prep->prep_origseq);
740 return frm;
741 }
742
743 /*
744 * Add a Mesh Path Error IE to a frame.
745 */
746 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
747 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
748 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
749 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
750 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode
751 static uint8_t *
752 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
753 {
754 int i;
755
756 *frm++ = IEEE80211_ELEMID_MESHPERR;
757 *frm++ = perr->perr_len; /* len already calculated */
758 *frm++ = perr->perr_ttl;
759 *frm++ = perr->perr_ndests;
760 for (i = 0; i < perr->perr_ndests; i++) {
761 *frm++ = PERR_DFLAGS(i);
762 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
763 frm += 6;
764 ADDWORD(frm, PERR_DSEQ(i));
765 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
766 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
767 frm += 6;
768 }
769 ADDSHORT(frm, PERR_DRCODE(i));
770 }
771 return frm;
772 }
773 #undef PERR_DFLAGS
774 #undef PERR_DADDR
775 #undef PERR_DSEQ
776 #undef PERR_EXTADDR
777 #undef PERR_DRCODE
778
779 /*
780 * Add a Root Annoucement IE to a frame.
781 */
782 static uint8_t *
783 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
784 {
785 *frm++ = IEEE80211_ELEMID_MESHRANN;
786 *frm++ = rann->rann_len;
787 *frm++ = rann->rann_flags;
788 *frm++ = rann->rann_hopcount;
789 *frm++ = rann->rann_ttl;
790 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
791 ADDWORD(frm, rann->rann_seq);
792 ADDWORD(frm, rann->rann_interval);
793 ADDWORD(frm, rann->rann_metric);
794 return frm;
795 }
796
797 static void
798 hwmp_rootmode_setup(struct ieee80211vap *vap)
799 {
800 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
801 struct ieee80211_mesh_state *ms = vap->iv_mesh;
802
803 switch (hs->hs_rootmode) {
804 case IEEE80211_HWMP_ROOTMODE_DISABLED:
805 callout_drain(&hs->hs_roottimer);
806 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT;
807 break;
808 case IEEE80211_HWMP_ROOTMODE_NORMAL:
809 case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
810 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
811 hwmp_rootmode_cb, vap);
812 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
813 break;
814 case IEEE80211_HWMP_ROOTMODE_RANN:
815 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
816 hwmp_rootmode_rann_cb, vap);
817 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
818 break;
819 }
820 }
821
822 /*
823 * Send a broadcast Path Request to find all nodes on the mesh. We are
824 * called when the vap is configured as a HWMP root node.
825 */
826 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
827 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
828 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
829 static void
830 hwmp_rootmode_cb(void *arg)
831 {
832 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
833 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
834 struct ieee80211_mesh_state *ms = vap->iv_mesh;
835 struct ieee80211_meshpreq_ie preq;
836
837 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
838 "%s", "send broadcast PREQ");
839
840 preq.preq_flags = 0;
841 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
842 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
843 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
844 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
845 preq.preq_hopcount = 0;
846 preq.preq_ttl = ms->ms_ttl;
847 preq.preq_id = ++hs->hs_preqid;
848 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
849 preq.preq_origseq = ++hs->hs_seq;
850 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
851 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
852 preq.preq_tcount = 1;
853 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
854 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
855 IEEE80211_MESHPREQ_TFLAGS_USN;
856 PREQ_TSEQ(0) = 0;
857 vap->iv_stats.is_hwmp_rootreqs++;
858 /* NB: we enforce rate check ourself */
859 hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL);
860 hwmp_rootmode_setup(vap);
861 }
862 #undef PREQ_TFLAGS
863 #undef PREQ_TADDR
864 #undef PREQ_TSEQ
865
866 /*
867 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
868 * called when the vap is configured as a HWMP RANN root node.
869 */
870 static void
871 hwmp_rootmode_rann_cb(void *arg)
872 {
873 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
874 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
875 struct ieee80211_mesh_state *ms = vap->iv_mesh;
876 struct ieee80211_meshrann_ie rann;
877
878 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
879 "%s", "send broadcast RANN");
880
881 rann.rann_flags = 0;
882 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
883 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
884 rann.rann_hopcount = 0;
885 rann.rann_ttl = ms->ms_ttl;
886 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
887 rann.rann_seq = ++hs->hs_seq;
888 rann.rann_interval = ieee80211_hwmp_rannint;
889 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
890
891 vap->iv_stats.is_hwmp_rootrann++;
892 hwmp_send_rann(vap, broadcastaddr, &rann);
893 hwmp_rootmode_setup(vap);
894 }
895
896 /*
897 * Update forwarding information to TA if metric improves.
898 */
899 static void
900 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni,
901 const char *hwmp_frame)
902 {
903 struct ieee80211_mesh_state *ms = vap->iv_mesh;
904 struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */
905 int metric = 0;
906
907 rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
908 if (rttran == NULL) {
909 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr);
910 if (rttran == NULL) {
911 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
912 "unable to add path to transmitter %6D of %s",
913 ni->ni_macaddr, ":", hwmp_frame);
914 vap->iv_stats.is_mesh_rtaddfailed++;
915 return;
916 }
917 }
918 metric = ms->ms_pmetric->mpm_metric(ni);
919 if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) ||
920 rttran->rt_metric > metric)
921 {
922 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
923 "%s path to transmitter %6D of %s, metric %d:%d",
924 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
925 "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame,
926 rttran->rt_metric, metric);
927 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr);
928 rttran->rt_metric = metric;
929 rttran->rt_nhops = 1;
930 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact);
931 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
932 }
933 }
934
935 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
936 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
937 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
938 static void
939 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
940 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
941 {
942 struct ieee80211_mesh_state *ms = vap->iv_mesh;
943 struct ieee80211_mesh_route *rtorig = NULL;
944 struct ieee80211_mesh_route *rtorig_ext = NULL;
945 struct ieee80211_mesh_route *rttarg = NULL;
946 struct ieee80211_hwmp_route *hrorig = NULL;
947 struct ieee80211_hwmp_route *hrtarg = NULL;
948 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
949 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */
950 uint32_t metric = 0;
951
952 /*
953 * Ignore PREQs from us. Could happen because someone forward it
954 * back to us.
955 */
956 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
957 return;
958
959 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
960 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
961 PREQ_TADDR(0), ":");
962
963 /*
964 * Acceptance criteria: (if the PREQ is not for us or not broadcast,
965 * or an external mac address not proxied by us),
966 * AND forwarding is disabled, discard this PREQ.
967 */
968 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
969 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
970 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
971 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
972 (rttarg != NULL &&
973 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
974 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
975 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
976 preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
977 return;
978 }
979 /*
980 * Acceptance criteria: if unicast addressed
981 * AND no valid forwarding for Target of PREQ, discard this PREQ.
982 */
983 if(rttarg != NULL)
984 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
985 struct ieee80211_hwmp_route);
986 /* Address mode: ucast */
987 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
988 rttarg == NULL &&
989 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
990 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
991 preq->preq_origaddr, NULL,
992 "unicast addressed PREQ of unknown target %6D",
993 PREQ_TADDR(0), ":");
994 return;
995 }
996
997 /* PREQ ACCEPTED */
998
999 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
1000 if (rtorig == NULL) {
1001 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
1002 if (rtorig == NULL) {
1003 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1004 "unable to add orig path to %6D",
1005 preq->preq_origaddr, ":");
1006 vap->iv_stats.is_mesh_rtaddfailed++;
1007 return;
1008 }
1009 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1010 "adding originator %6D", preq->preq_origaddr, ":");
1011 }
1012 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
1013
1014 /* record last seen preqid */
1015 preqid = hrorig->hr_preqid;
1016 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
1017
1018 /* Data creation and update of forwarding information
1019 * according to Table 11C-8 for originator mesh STA.
1020 */
1021 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
1022 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
1023 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
1024 metric < rtorig->rt_metric)) {
1025 hrorig->hr_seq = preq->preq_origseq;
1026 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
1027 rtorig->rt_metric = metric;
1028 rtorig->rt_nhops = preq->preq_hopcount + 1;
1029 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
1030 /* Path to orig is valid now.
1031 * NB: we know it can't be Proxy, and if it is GATE
1032 * it will be marked below.
1033 */
1034 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
1035 } else if ((hrtarg != NULL &&
1036 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
1037 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1038 preqid >= preq->preq_id)) {
1039 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1040 "discard PREQ from %6D, old seqno %u <= %u,"
1041 " or old preqid %u < %u",
1042 preq->preq_origaddr, ":",
1043 preq->preq_origseq, hrorig->hr_seq,
1044 preq->preq_id, preqid);
1045 return;
1046 }
1047
1048 /* Update forwarding information to TA if metric improves. */
1049 hwmp_update_transmitter(vap, ni, "PREQ");
1050
1051 /*
1052 * Check if the PREQ is addressed to us.
1053 * or a Proxy currently gated by us.
1054 */
1055 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
1056 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE &&
1057 rttarg != NULL &&
1058 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) &&
1059 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
1060 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1061 struct ieee80211_meshprep_ie prep;
1062
1063 /*
1064 * When we are the target we shall update our own HWMP seq
1065 * number with max of (current and preq->seq) + 1
1066 */
1067 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
1068
1069 prep.prep_flags = 0;
1070 prep.prep_hopcount = 0;
1071 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1072 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
1073 if (rttarg != NULL && /* if NULL it means we are the target */
1074 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1075 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1076 "reply for proxy %6D", rttarg->rt_dest, ":");
1077 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
1078 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
1079 rttarg->rt_dest);
1080 /* update proxy seqno to HWMP seqno */
1081 rttarg->rt_ext_seq = hs->hs_seq;
1082 prep.prep_hopcount = rttarg->rt_nhops;
1083 prep.prep_metric = rttarg->rt_metric;
1084 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
1085 }
1086 /*
1087 * Build and send a PREP frame.
1088 */
1089 prep.prep_ttl = ms->ms_ttl;
1090 prep.prep_targetseq = hs->hs_seq;
1091 prep.prep_lifetime = preq->preq_lifetime;
1092 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
1093 prep.prep_origseq = preq->preq_origseq;
1094
1095 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1096 "reply to %6D", preq->preq_origaddr, ":");
1097 hwmp_send_prep(vap, wh->i_addr2, &prep);
1098 return;
1099 }
1100 /* we may update our proxy information for the orig external */
1101 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
1102 rtorig_ext =
1103 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
1104 if (rtorig_ext == NULL) {
1105 rtorig_ext = ieee80211_mesh_rt_add(vap,
1106 preq->preq_orig_ext_addr);
1107 if (rtorig_ext == NULL) {
1108 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1109 "unable to add orig ext proxy to %6D",
1110 preq->preq_orig_ext_addr, ":");
1111 vap->iv_stats.is_mesh_rtaddfailed++;
1112 return;
1113 }
1114 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
1115 preq->preq_origaddr);
1116 }
1117 rtorig_ext->rt_ext_seq = preq->preq_origseq;
1118 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
1119 }
1120 /*
1121 * Proactive PREQ: reply with a proactive PREP to the
1122 * root STA if requested.
1123 */
1124 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
1125 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
1126 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1127 "root mesh station @ %6D", preq->preq_origaddr, ":");
1128
1129 /* Check if root is a mesh gate, mark it */
1130 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) {
1131 struct ieee80211_mesh_gate_route *gr;
1132
1133 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1134 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr,
1135 rtorig);
1136 gr->gr_lastseq = 0; /* NOT GANN */
1137 }
1138
1139 /*
1140 * Reply with a PREP if we don't have a path to the root
1141 * or if the root sent us a proactive PREQ.
1142 */
1143 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1144 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
1145 struct ieee80211_meshprep_ie prep;
1146
1147 prep.prep_flags = 0;
1148 prep.prep_hopcount = 0;
1149 prep.prep_ttl = ms->ms_ttl;
1150 IEEE80211_ADDR_COPY(prep.prep_origaddr,
1151 preq->preq_origaddr);
1152 prep.prep_origseq = preq->preq_origseq;
1153 prep.prep_lifetime = preq->preq_lifetime;
1154 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1155 IEEE80211_ADDR_COPY(prep.prep_targetaddr,
1156 vap->iv_myaddr);
1157 prep.prep_targetseq = ++hs->hs_seq;
1158 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1159 }
1160 }
1161
1162 /*
1163 * Forwarding and Intermediate reply for PREQs with 1 target.
1164 */
1165 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
1166 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1167 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
1168
1169 memcpy(&ppreq, preq, sizeof(ppreq));
1170
1171 /*
1172 * We have a valid route to this node.
1173 * NB: if target is proxy dont reply.
1174 */
1175 if (rttarg != NULL &&
1176 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1177 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
1178 /*
1179 * Check if we can send an intermediate Path Reply,
1180 * i.e., Target Only bit is not set and target is not
1181 * the MAC broadcast address.
1182 */
1183 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
1184 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
1185 struct ieee80211_meshprep_ie prep;
1186
1187 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1188 "intermediate reply for PREQ from %6D",
1189 preq->preq_origaddr, ":");
1190 prep.prep_flags = 0;
1191 prep.prep_hopcount = rttarg->rt_nhops;
1192 prep.prep_ttl = ms->ms_ttl;
1193 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
1194 PREQ_TADDR(0));
1195 prep.prep_targetseq = hrtarg->hr_seq;
1196 prep.prep_lifetime = preq->preq_lifetime;
1197 prep.prep_metric =rttarg->rt_metric;
1198 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
1199 preq->preq_origaddr);
1200 prep.prep_origseq = hrorig->hr_seq;
1201 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1202
1203 /*
1204 * Set TO and unset RF bits because we have
1205 * sent a PREP.
1206 */
1207 ppreq.preq_targets[0].target_flags |=
1208 IEEE80211_MESHPREQ_TFLAGS_TO;
1209 }
1210 }
1211
1212 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1213 "forward PREQ from %6D",
1214 preq->preq_origaddr, ":");
1215 ppreq.preq_hopcount += 1;
1216 ppreq.preq_ttl -= 1;
1217 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
1218
1219 /* don't do PREQ ratecheck when we propagate */
1220 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL);
1221 }
1222 }
1223 #undef PREQ_TFLAGS
1224 #undef PREQ_TADDR
1225 #undef PREQ_TSEQ
1226
1227 static int
1228 hwmp_send_preq(struct ieee80211vap *vap,
1229 const uint8_t da[IEEE80211_ADDR_LEN],
1230 struct ieee80211_meshpreq_ie *preq,
1231 struct timeval *last, struct timeval *minint)
1232 {
1233
1234 /*
1235 * Enforce PREQ interval.
1236 * NB: Proactive ROOT PREQs rate is handled by cb task.
1237 */
1238 if (last != NULL && minint != NULL) {
1239 if (ratecheck(last, minint) == 0)
1240 return EALREADY; /* XXX: we should postpone */
1241 getmicrouptime(last);
1242 }
1243
1244 /*
1245 * mesh preq action frame format
1246 * [6] da
1247 * [6] sa
1248 * [6] addr3 = sa
1249 * [1] action
1250 * [1] category
1251 * [tlv] mesh path request
1252 */
1253 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
1254 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
1255 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
1256 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
1257 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2);
1258 }
1259
1260 static void
1261 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
1262 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
1263 {
1264 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
1265 #define PROXIED_BY_US(rt) \
1266 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
1267 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1268 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1269 struct ieee80211_mesh_route *rt = NULL;
1270 struct ieee80211_mesh_route *rtorig = NULL;
1271 struct ieee80211_mesh_route *rtext = NULL;
1272 struct ieee80211_hwmp_route *hr;
1273 struct ieee80211com *ic = vap->iv_ic;
1274 struct mbuf *m, *next;
1275 uint32_t metric = 0;
1276 const uint8_t *addr;
1277
1278 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1279 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
1280 prep->prep_targetaddr, ":");
1281
1282 /*
1283 * Acceptance criteria: (If the corresponding PREP was not generated
1284 * by us OR not generated by an external mac that is not proxied by us)
1285 * AND forwarding is disabled, discard this PREP.
1286 */
1287 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
1288 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
1289 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
1290 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
1291 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1292 "discard PREP, orig(%6D) not proxied or generated by us",
1293 prep->prep_origaddr, ":");
1294 return;
1295 }
1296
1297 /* PREP ACCEPTED */
1298
1299 /*
1300 * If accepted shall create or update the active forwarding information
1301 * it maintains for the target mesh STA of the PREP (according to the
1302 * rules defined in 13.10.8.4). If the conditions for creating or
1303 * updating the forwarding information have not been met in those
1304 * rules, no further steps are applied to the PREP.
1305 */
1306 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
1307 if (rt == NULL) {
1308 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
1309 if (rt == NULL) {
1310 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1311 "unable to add PREP path to %6D",
1312 prep->prep_targetaddr, ":");
1313 vap->iv_stats.is_mesh_rtaddfailed++;
1314 return;
1315 }
1316 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1317 "adding target %6D", prep->prep_targetaddr, ":");
1318 }
1319 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1320 /* update path metric */
1321 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
1322 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1323 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
1324 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1325 "discard PREP from %6D, old seq no %u < %u",
1326 prep->prep_targetaddr, ":",
1327 prep->prep_targetseq, hr->hr_seq);
1328 return;
1329 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
1330 metric > rt->rt_metric) {
1331 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1332 "discard PREP from %6D, new metric %u > %u",
1333 prep->prep_targetaddr, ":",
1334 metric, rt->rt_metric);
1335 return;
1336 }
1337 }
1338
1339 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1340 "%s path to %6D, hopcount %d:%d metric %d:%d",
1341 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1342 "prefer" : "update",
1343 prep->prep_targetaddr, ":",
1344 rt->rt_nhops, prep->prep_hopcount + 1,
1345 rt->rt_metric, metric);
1346
1347 hr->hr_seq = prep->prep_targetseq;
1348 hr->hr_preqretries = 0;
1349 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
1350 rt->rt_metric = metric;
1351 rt->rt_nhops = prep->prep_hopcount + 1;
1352 ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
1353 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1354 /* discovery complete */
1355 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
1356 }
1357 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
1358
1359 /* Update forwarding information to TA if metric improves */
1360 hwmp_update_transmitter(vap, ni, "PREP");
1361
1362 /*
1363 * If it's NOT for us, propagate the PREP
1364 */
1365 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
1366 prep->prep_ttl > 1 &&
1367 prep->prep_hopcount < hs->hs_maxhops) {
1368 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1369 /*
1370 * NB: We should already have setup the path to orig
1371 * mesh STA when we propagated PREQ to target mesh STA,
1372 * no PREP is generated without a corresponding PREQ.
1373 * XXX: for now just ignore.
1374 */
1375 if (rtorig == NULL) {
1376 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1377 "received PREP for an unknown orig(%6D)",
1378 prep->prep_origaddr, ":");
1379 return;
1380 }
1381
1382 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1383 "propagate PREP from %6D",
1384 prep->prep_targetaddr, ":");
1385
1386 memcpy(&pprep, prep, sizeof(pprep));
1387 pprep.prep_hopcount += 1;
1388 pprep.prep_ttl -= 1;
1389 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1390 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep);
1391
1392 /* precursor list for the Target Mesh STA Address is updated */
1393 }
1394
1395 /*
1396 * Check if we received a PREP w/ AE and store target external address.
1397 * We may store target external address if recevied PREP w/ AE
1398 * and we are not final destination
1399 */
1400 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
1401 rtext = ieee80211_mesh_rt_find(vap,
1402 prep->prep_target_ext_addr);
1403 if (rtext == NULL) {
1404 rtext = ieee80211_mesh_rt_add(vap,
1405 prep->prep_target_ext_addr);
1406 if (rtext == NULL) {
1407 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1408 "unable to add PREP path to proxy %6D",
1409 prep->prep_targetaddr, ":");
1410 vap->iv_stats.is_mesh_rtaddfailed++;
1411 return;
1412 }
1413 }
1414 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1415 "%s path to %6D, hopcount %d:%d metric %d:%d",
1416 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1417 "prefer" : "update",
1418 prep->prep_target_ext_addr, ":",
1419 rtext->rt_nhops, prep->prep_hopcount + 1,
1420 rtext->rt_metric, metric);
1421
1422 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
1423 IEEE80211_MESHRT_FLAGS_VALID;
1424 IEEE80211_ADDR_COPY(rtext->rt_dest,
1425 prep->prep_target_ext_addr);
1426 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
1427 prep->prep_targetaddr);
1428 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
1429 rtext->rt_metric = metric;
1430 rtext->rt_lifetime = prep->prep_lifetime;
1431 rtext->rt_nhops = prep->prep_hopcount + 1;
1432 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
1433 /*
1434 * XXX: proxy entries have no HWMP priv data,
1435 * nullify them to be sure?
1436 */
1437 }
1438 /*
1439 * Check for frames queued awaiting path discovery.
1440 * XXX probably can tell exactly and avoid remove call
1441 * NB: hash may have false matches, if so they will get
1442 * stuck back on the stageq because there won't be
1443 * a path.
1444 */
1445 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1446 prep->prep_target_ext_addr : prep->prep_targetaddr;
1447 m = ieee80211_ageq_remove(&ic->ic_stageq,
1448 (struct ieee80211_node *)(uintptr_t)
1449 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
1450
1451 /*
1452 * All frames in the stageq here should be non-M_ENCAP; or things
1453 * will get very unhappy.
1454 */
1455 for (; m != NULL; m = next) {
1456 next = m->m_nextpkt;
1457 m->m_nextpkt = NULL;
1458 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1459 "flush queued frame %p len %d", m, m->m_pkthdr.len);
1460 /*
1461 * If the mbuf has M_ENCAP set, ensure we free it.
1462 * Note that after if_transmit() is called, m is invalid.
1463 */
1464 (void) ieee80211_vap_xmitpkt(vap, m);
1465 }
1466 #undef IS_PROXY
1467 #undef PROXIED_BY_US
1468 }
1469
1470 static int
1471 hwmp_send_prep(struct ieee80211vap *vap,
1472 const uint8_t da[IEEE80211_ADDR_LEN],
1473 struct ieee80211_meshprep_ie *prep)
1474 {
1475 /* NB: there's no PREP minimum interval. */
1476
1477 /*
1478 * mesh prep action frame format
1479 * [6] da
1480 * [6] sa
1481 * [6] addr3 = sa
1482 * [1] action
1483 * [1] category
1484 * [tlv] mesh path reply
1485 */
1486 prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1487 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1488 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
1489 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2);
1490 }
1491
1492 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1493 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1494 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1495 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1496 static void
1497 hwmp_peerdown(struct ieee80211_node *ni)
1498 {
1499 struct ieee80211vap *vap = ni->ni_vap;
1500 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1501 struct ieee80211_meshperr_ie perr;
1502 struct ieee80211_mesh_route *rt;
1503 struct ieee80211_hwmp_route *hr;
1504
1505 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1506 if (rt == NULL)
1507 return;
1508 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1509 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1510 "%s", "delete route entry");
1511 perr.perr_ttl = ms->ms_ttl;
1512 perr.perr_ndests = 1;
1513 PERR_DFLAGS(0) = 0;
1514 if (hr->hr_seq == 0)
1515 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1516 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1517 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1518 PERR_DSEQ(0) = ++hr->hr_seq;
1519 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1520 /* NB: flush everything passing through peer */
1521 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1522 hwmp_send_perr(vap, broadcastaddr, &perr);
1523 }
1524 #undef PERR_DFLAGS
1525 #undef PERR_DADDR
1526 #undef PERR_DSEQ
1527 #undef PERR_DRCODE
1528
1529 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
1530 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
1531 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
1532 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr
1533 static void
1534 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1535 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1536 {
1537 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1538 struct ieee80211_mesh_route *rt = NULL;
1539 struct ieee80211_mesh_route *rt_ext = NULL;
1540 struct ieee80211_hwmp_route *hr;
1541 struct ieee80211_meshperr_ie *pperr = NULL;
1542 int i, j = 0, forward = 0;
1543
1544 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1545 "received PERR from %6D", wh->i_addr2, ":");
1546
1547 /*
1548 * if forwarding is true, prepare pperr
1549 */
1550 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1551 forward = 1;
1552 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
1553 M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */
1554 }
1555
1556 /*
1557 * Acceptance criteria: check if we have forwarding information
1558 * stored about destination, and that nexthop == TA of this PERR.
1559 * NB: we also build a new PERR to propagate in case we should forward.
1560 */
1561 for (i = 0; i < perr->perr_ndests; i++) {
1562 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1563 if (rt == NULL)
1564 continue;
1565 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
1566 continue;
1567
1568 /* found and accepted a PERR ndest element, process it... */
1569 if (forward)
1570 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
1571 sizeof(*perr->perr_dests));
1572 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1573 switch(PERR_DFLAGS(i)) {
1574 case (IEEE80211_REASON_MESH_PERR_NO_FI):
1575 if (PERR_DSEQ(i) == 0) {
1576 hr->hr_seq++;
1577 if (forward) {
1578 pperr->perr_dests[j].dest_seq =
1579 hr->hr_seq;
1580 }
1581 } else {
1582 hr->hr_seq = PERR_DSEQ(i);
1583 }
1584 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1585 j++;
1586 break;
1587 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
1588 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
1589 hr->hr_seq = PERR_DSEQ(i);
1590 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1591 j++;
1592 }
1593 break;
1594 case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
1595 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
1596 if (rt_ext != NULL) {
1597 rt_ext->rt_flags &=
1598 ~IEEE80211_MESHRT_FLAGS_VALID;
1599 j++;
1600 }
1601 break;
1602 default:
1603 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1604 "PERR, unknown reason code %u\n", PERR_DFLAGS(i));
1605 goto done; /* XXX: stats?? */
1606 }
1607 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i));
1608 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
1609 }
1610 if (j == 0) {
1611 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
1612 "PERR not accepted");
1613 goto done; /* XXX: stats?? */
1614 }
1615
1616 /*
1617 * Propagate the PERR if we previously found it on our routing table.
1618 */
1619 if (forward && perr->perr_ttl > 1) {
1620 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1621 "propagate PERR from %6D", wh->i_addr2, ":");
1622 pperr->perr_ndests = j;
1623 pperr->perr_ttl--;
1624 hwmp_send_perr(vap, broadcastaddr, pperr);
1625 }
1626 done:
1627 if (pperr != NULL)
1628 IEEE80211_FREE(pperr, M_80211_MESH_PERR);
1629 }
1630 #undef PERR_DFLAGS
1631 #undef PERR_DADDR
1632 #undef PERR_DSEQ
1633 #undef PERR_DEXTADDR
1634
1635 static int
1636 hwmp_send_perr(struct ieee80211vap *vap,
1637 const uint8_t da[IEEE80211_ADDR_LEN],
1638 struct ieee80211_meshperr_ie *perr)
1639 {
1640 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1641 int i;
1642 uint8_t length = 0;
1643
1644 /*
1645 * Enforce PERR interval.
1646 */
1647 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1648 return EALREADY;
1649 getmicrouptime(&hs->hs_lastperr);
1650
1651 /*
1652 * mesh perr action frame format
1653 * [6] da
1654 * [6] sa
1655 * [6] addr3 = sa
1656 * [1] action
1657 * [1] category
1658 * [tlv] mesh path error
1659 */
1660 perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1661 length = IEEE80211_MESHPERR_BASE_SZ;
1662 for (i = 0; i<perr->perr_ndests; i++) {
1663 if (perr->perr_dests[i].dest_flags &
1664 IEEE80211_MESHPERR_FLAGS_AE) {
1665 length += IEEE80211_MESHPERR_DEST_SZ_AE;
1666 continue ;
1667 }
1668 length += IEEE80211_MESHPERR_DEST_SZ;
1669 }
1670 perr->perr_len =length;
1671 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2);
1672 }
1673
1674 /*
1675 * Called from the rest of the net80211 code (mesh code for example).
1676 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
1677 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
1678 */
1679 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1680 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1681 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1682 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr
1683 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1684 static void
1685 hwmp_senderror(struct ieee80211vap *vap,
1686 const uint8_t addr[IEEE80211_ADDR_LEN],
1687 struct ieee80211_mesh_route *rt, int rcode)
1688 {
1689 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1690 struct ieee80211_hwmp_route *hr = NULL;
1691 struct ieee80211_meshperr_ie perr;
1692
1693 if (rt != NULL)
1694 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1695 struct ieee80211_hwmp_route);
1696
1697 perr.perr_ndests = 1;
1698 perr.perr_ttl = ms->ms_ttl;
1699 PERR_DFLAGS(0) = 0;
1700 PERR_DRCODE(0) = rcode;
1701
1702 switch (rcode) {
1703 case IEEE80211_REASON_MESH_PERR_NO_FI:
1704 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1705 PERR_DSEQ(0) = 0; /* reserved */
1706 break;
1707 case IEEE80211_REASON_MESH_PERR_NO_PROXY:
1708 KASSERT(rt != NULL, ("no proxy info for sending PERR"));
1709 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
1710 ("route is not marked proxy"));
1711 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
1712 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
1713 PERR_DSEQ(0) = rt->rt_ext_seq;
1714 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
1715 break;
1716 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
1717 KASSERT(rt != NULL, ("no route info for sending PERR"));
1718 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1719 PERR_DSEQ(0) = hr->hr_seq;
1720 break;
1721 default:
1722 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
1723 }
1724 hwmp_send_perr(vap, broadcastaddr, &perr);
1725 }
1726 #undef PERR_DFLAGS
1727 #undef PEER_DADDR
1728 #undef PERR_DSEQ
1729 #undef PERR_DEXTADDR
1730 #undef PERR_DRCODE
1731
1732 static void
1733 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1734 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1735 {
1736 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1737 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1738 struct ieee80211_mesh_route *rt = NULL;
1739 struct ieee80211_hwmp_route *hr;
1740 struct ieee80211_meshpreq_ie preq;
1741 struct ieee80211_meshrann_ie prann;
1742
1743 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
1744 return;
1745
1746 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1747 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
1748 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1749
1750 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
1751 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
1752 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1753 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
1754 return;
1755 }
1756
1757 /* Acceptance criteria: if RANN.seq == stored seq AND
1758 * RANN.metric > stored metric, discard RANN */
1759 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
1760 rann->rann_metric > rt->rt_metric) {
1761 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1762 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
1763 return;
1764 }
1765 }
1766
1767 /* RANN ACCEPTED */
1768
1769 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
1770
1771 if (rt == NULL) {
1772 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
1773 if (rt == NULL) {
1774 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1775 "unable to add mac for RANN root %6D",
1776 rann->rann_addr, ":");
1777 vap->iv_stats.is_mesh_rtaddfailed++;
1778 return;
1779 }
1780 }
1781 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1782 /* Check if root is a mesh gate, mark it */
1783 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) {
1784 struct ieee80211_mesh_gate_route *gr;
1785
1786 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1787 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr,
1788 rt);
1789 gr->gr_lastseq = 0; /* NOT GANN */
1790 }
1791 /* discovery timeout */
1792 ieee80211_mesh_rt_update(rt,
1793 ticks_to_msecs(ieee80211_hwmp_roottimeout));
1794
1795 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
1796 preq.preq_hopcount = 0;
1797 preq.preq_ttl = ms->ms_ttl;
1798 preq.preq_id = 0; /* reserved */
1799 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1800 preq.preq_origseq = ++hs->hs_seq;
1801 preq.preq_lifetime = ieee80211_hwmp_roottimeout;
1802 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1803 preq.preq_tcount = 1;
1804 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
1805 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
1806 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
1807 preq.preq_targets[0].target_seq = rann->rann_seq;
1808 /* XXX: if rootconfint have not passed, we built this preq in vain */
1809 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf,
1810 &ieee80211_hwmp_rootconfint);
1811
1812 /* propagate a RANN */
1813 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1814 rann->rann_ttl > 1 &&
1815 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1816 hr->hr_seq = rann->rann_seq;
1817 memcpy(&prann, rann, sizeof(prann));
1818 prann.rann_hopcount += 1;
1819 prann.rann_ttl -= 1;
1820 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
1821 hwmp_send_rann(vap, broadcastaddr, &prann);
1822 }
1823 }
1824
1825 static int
1826 hwmp_send_rann(struct ieee80211vap *vap,
1827 const uint8_t da[IEEE80211_ADDR_LEN],
1828 struct ieee80211_meshrann_ie *rann)
1829 {
1830 /*
1831 * mesh rann action frame format
1832 * [6] da
1833 * [6] sa
1834 * [6] addr3 = sa
1835 * [1] action
1836 * [1] category
1837 * [tlv] root annoucement
1838 */
1839 rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
1840 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
1841 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2);
1842 }
1843
1844 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
1845 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
1846 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
1847 static void
1848 hwmp_rediscover_cb(void *arg)
1849 {
1850 struct ieee80211_mesh_route *rt = arg;
1851 struct ieee80211vap *vap = rt->rt_vap;
1852 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1853 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1854 struct ieee80211_hwmp_route *hr;
1855 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
1856
1857 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
1858 return ; /* nothing to do */
1859
1860 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1861 if (hr->hr_preqretries >=
1862 ieee80211_hwmp_maxpreq_retries) {
1863 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY,
1864 rt->rt_dest, "%s",
1865 "max number of discovery, send queued frames to GATE");
1866 ieee80211_mesh_forward_to_gates(vap, rt);
1867 vap->iv_stats.is_mesh_fwd_nopath++;
1868 return ; /* XXX: flush queue? */
1869 }
1870
1871 hr->hr_preqretries++;
1872
1873
1874 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
1875 "start path rediscovery , target seq %u", hr->hr_seq);
1876 /*
1877 * Try to discover the path for this node.
1878 * Group addressed PREQ Case A
1879 */
1880 preq.preq_flags = 0;
1881 preq.preq_hopcount = 0;
1882 preq.preq_ttl = ms->ms_ttl;
1883 preq.preq_id = ++hs->hs_preqid;
1884 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1885 preq.preq_origseq = hr->hr_origseq;
1886 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1887 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1888 preq.preq_tcount = 1;
1889 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
1890 PREQ_TFLAGS(0) = 0;
1891 if (ieee80211_hwmp_targetonly)
1892 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1893 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1894 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1895 /* XXX check return value */
1896 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq,
1897 &ieee80211_hwmp_preqminint);
1898 callout_reset(&rt->rt_discovery,
1899 ieee80211_hwmp_net_diameter_traversaltime * 2,
1900 hwmp_rediscover_cb, rt);
1901 }
1902
1903 static struct ieee80211_node *
1904 hwmp_discover(struct ieee80211vap *vap,
1905 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
1906 {
1907 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1908 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1909 struct ieee80211_mesh_route *rt = NULL;
1910 struct ieee80211_hwmp_route *hr;
1911 struct ieee80211_meshpreq_ie preq;
1912 struct ieee80211_node *ni;
1913 int sendpreq = 0;
1914
1915 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1916 ("not a mesh vap, opmode %d", vap->iv_opmode));
1917
1918 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
1919 ("%s: discovering self!", __func__));
1920
1921 ni = NULL;
1922 if (!IEEE80211_IS_MULTICAST(dest)) {
1923 rt = ieee80211_mesh_rt_find(vap, dest);
1924 if (rt == NULL) {
1925 rt = ieee80211_mesh_rt_add(vap, dest);
1926 if (rt == NULL) {
1927 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
1928 ni, "unable to add discovery path to %6D",
1929 dest, ":");
1930 vap->iv_stats.is_mesh_rtaddfailed++;
1931 goto done;
1932 }
1933 }
1934 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1935 struct ieee80211_hwmp_route);
1936 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1937 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1938 "%s", "already discovering queue frame until path found");
1939 sendpreq = 1;
1940 goto done;
1941 }
1942 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
1943 if (hr->hr_lastdiscovery != 0 &&
1944 (ticks - hr->hr_lastdiscovery <
1945 (ieee80211_hwmp_net_diameter_traversaltime * 2))) {
1946 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1947 dest, NULL, "%s",
1948 "too frequent discovery requeust");
1949 sendpreq = 1;
1950 goto done;
1951 }
1952 hr->hr_lastdiscovery = ticks;
1953 if (hr->hr_preqretries >=
1954 ieee80211_hwmp_maxpreq_retries) {
1955 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1956 dest, NULL, "%s",
1957 "no valid path , max number of discovery");
1958 vap->iv_stats.is_mesh_fwd_nopath++;
1959 goto done;
1960 }
1961 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
1962 hr->hr_preqretries++;
1963 if (hr->hr_origseq == 0)
1964 hr->hr_origseq = ++hs->hs_seq;
1965 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1966 sendpreq = 1;
1967 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1968 "start path discovery (src %s), target seq %u",
1969 m == NULL ? "<none>" : ether_sprintf(
1970 mtod(m, struct ether_header *)->ether_shost),
1971 hr->hr_seq);
1972 /*
1973 * Try to discover the path for this node.
1974 * Group addressed PREQ Case A
1975 */
1976 preq.preq_flags = 0;
1977 preq.preq_hopcount = 0;
1978 preq.preq_ttl = ms->ms_ttl;
1979 preq.preq_id = ++hs->hs_preqid;
1980 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1981 preq.preq_origseq = hr->hr_origseq;
1982 preq.preq_lifetime =
1983 ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1984 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1985 preq.preq_tcount = 1;
1986 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
1987 PREQ_TFLAGS(0) = 0;
1988 if (ieee80211_hwmp_targetonly)
1989 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1990 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1991 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1992 /* XXX check return value */
1993 hwmp_send_preq(vap, broadcastaddr, &preq,
1994 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint);
1995 callout_reset(&rt->rt_discovery,
1996 ieee80211_hwmp_net_diameter_traversaltime * 2,
1997 hwmp_rediscover_cb, rt);
1998 }
1999 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
2000 ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
2001 } else {
2002 ni = ieee80211_find_txnode(vap, dest);
2003 /* NB: if null then we leak mbuf */
2004 KASSERT(ni != NULL, ("leak mcast frame"));
2005 return ni;
2006 }
2007 done:
2008 if (ni == NULL && m != NULL) {
2009 if (sendpreq) {
2010 struct ieee80211com *ic = vap->iv_ic;
2011 /*
2012 * Queue packet for transmit when path discovery
2013 * completes. If discovery never completes the
2014 * frame will be flushed by way of the aging timer.
2015 */
2016 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
2017 "%s", "queue frame until path found");
2018 m->m_pkthdr.rcvif = (void *)(uintptr_t)
2019 ieee80211_mac_hash(ic, dest);
2020 /* XXX age chosen randomly */
2021 ieee80211_ageq_append(&ic->ic_stageq, m,
2022 IEEE80211_INACT_WAIT);
2023 } else {
2024 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
2025 dest, NULL, "%s", "no valid path to this node");
2026 m_freem(m);
2027 }
2028 }
2029 return ni;
2030 }
2031 #undef PREQ_TFLAGS
2032 #undef PREQ_TADDR
2033 #undef PREQ_TSEQ
2034
2035 static int
2036 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2037 {
2038 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2039 int error;
2040
2041 if (vap->iv_opmode != IEEE80211_M_MBSS)
2042 return ENOSYS;
2043 error = 0;
2044 switch (ireq->i_type) {
2045 case IEEE80211_IOC_HWMP_ROOTMODE:
2046 ireq->i_val = hs->hs_rootmode;
2047 break;
2048 case IEEE80211_IOC_HWMP_MAXHOPS:
2049 ireq->i_val = hs->hs_maxhops;
2050 break;
2051 default:
2052 return ENOSYS;
2053 }
2054 return error;
2055 }
2056 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
2057
2058 static int
2059 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2060 {
2061 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2062 int error;
2063
2064 if (vap->iv_opmode != IEEE80211_M_MBSS)
2065 return ENOSYS;
2066 error = 0;
2067 switch (ireq->i_type) {
2068 case IEEE80211_IOC_HWMP_ROOTMODE:
2069 if (ireq->i_val < 0 || ireq->i_val > 3)
2070 return EINVAL;
2071 hs->hs_rootmode = ireq->i_val;
2072 hwmp_rootmode_setup(vap);
2073 break;
2074 case IEEE80211_IOC_HWMP_MAXHOPS:
2075 if (ireq->i_val <= 0 || ireq->i_val > 255)
2076 return EINVAL;
2077 hs->hs_maxhops = ireq->i_val;
2078 break;
2079 default:
2080 return ENOSYS;
2081 }
2082 return error;
2083 }
2084 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);
Cache object: e8cf33371129dd25dc70fce44abf8168
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