1 /*-
2 * Copyright (c) 2009 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Rui Paulo under sponsorship from the
6 * FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29 #include <sys/cdefs.h>
30 #ifdef __FreeBSD__
31 __FBSDID("$FreeBSD$");
32 #endif
33
34 /*
35 * IEEE 802.11s Hybrid Wireless Mesh Protocol, HWMP.
36 *
37 * Based on March 2009, D3.0 802.11s draft spec.
38 */
39 #include "opt_inet.h"
40 #include "opt_wlan.h"
41
42 #include <sys/param.h>
43 #include <sys/systm.h>
44 #include <sys/mbuf.h>
45 #include <sys/malloc.h>
46 #include <sys/kernel.h>
47
48 #include <sys/socket.h>
49 #include <sys/sockio.h>
50 #include <sys/endian.h>
51 #include <sys/errno.h>
52 #include <sys/proc.h>
53 #include <sys/sysctl.h>
54
55 #include <net/if.h>
56 #include <net/if_media.h>
57 #include <net/if_llc.h>
58 #include <net/ethernet.h>
59
60 #include <net/bpf.h>
61
62 #include <net80211/ieee80211_var.h>
63 #include <net80211/ieee80211_action.h>
64 #include <net80211/ieee80211_input.h>
65 #include <net80211/ieee80211_mesh.h>
66
67 static void hwmp_vattach(struct ieee80211vap *);
68 static void hwmp_vdetach(struct ieee80211vap *);
69 static int hwmp_newstate(struct ieee80211vap *,
70 enum ieee80211_state, int);
71 static int hwmp_send_action(struct ieee80211vap *,
72 const uint8_t [IEEE80211_ADDR_LEN],
73 uint8_t *, size_t);
74 static uint8_t * hwmp_add_meshpreq(uint8_t *,
75 const struct ieee80211_meshpreq_ie *);
76 static uint8_t * hwmp_add_meshprep(uint8_t *,
77 const struct ieee80211_meshprep_ie *);
78 static uint8_t * hwmp_add_meshperr(uint8_t *,
79 const struct ieee80211_meshperr_ie *);
80 static uint8_t * hwmp_add_meshrann(uint8_t *,
81 const struct ieee80211_meshrann_ie *);
82 static void hwmp_rootmode_setup(struct ieee80211vap *);
83 static void hwmp_rootmode_cb(void *);
84 static void hwmp_rootmode_rann_cb(void *);
85 static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
86 const struct ieee80211_frame *,
87 const struct ieee80211_meshpreq_ie *);
88 static int hwmp_send_preq(struct ieee80211vap *,
89 const uint8_t [IEEE80211_ADDR_LEN],
90 struct ieee80211_meshpreq_ie *,
91 struct timeval *, struct timeval *);
92 static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
93 const struct ieee80211_frame *,
94 const struct ieee80211_meshprep_ie *);
95 static int hwmp_send_prep(struct ieee80211vap *,
96 const uint8_t [IEEE80211_ADDR_LEN],
97 struct ieee80211_meshprep_ie *);
98 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
99 const struct ieee80211_frame *,
100 const struct ieee80211_meshperr_ie *);
101 static int hwmp_send_perr(struct ieee80211vap *,
102 const uint8_t [IEEE80211_ADDR_LEN],
103 struct ieee80211_meshperr_ie *);
104 static void hwmp_senderror(struct ieee80211vap *,
105 const uint8_t [IEEE80211_ADDR_LEN],
106 struct ieee80211_mesh_route *, int);
107 static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
108 const struct ieee80211_frame *,
109 const struct ieee80211_meshrann_ie *);
110 static int hwmp_send_rann(struct ieee80211vap *,
111 const uint8_t [IEEE80211_ADDR_LEN],
112 struct ieee80211_meshrann_ie *);
113 static struct ieee80211_node *
114 hwmp_discover(struct ieee80211vap *,
115 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
116 static void hwmp_peerdown(struct ieee80211_node *);
117
118 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
119 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
120
121
122 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
123 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] =
124 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
125
126 typedef uint32_t ieee80211_hwmp_seq;
127 #define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0)
128 #define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0)
129 #define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0)
130 #define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0)
131
132 #define HWMP_SEQ_MAX(a, b) (a > b ? a : b)
133
134 /*
135 * Private extension of ieee80211_mesh_route.
136 */
137 struct ieee80211_hwmp_route {
138 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/
139 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */
140 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/
141 struct timeval hr_lastpreq; /* last time we sent a PREQ */
142 struct timeval hr_lastrootconf; /* last sent PREQ root conf */
143 int hr_preqretries; /* number of discoveries */
144 int hr_lastdiscovery; /* last discovery in ticks */
145 };
146 struct ieee80211_hwmp_state {
147 ieee80211_hwmp_seq hs_seq; /* next seq to be used */
148 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */
149 int hs_rootmode; /* proactive HWMP */
150 struct timeval hs_lastperr; /* last time we sent a PERR */
151 struct callout hs_roottimer;
152 uint8_t hs_maxhops; /* max hop count */
153 };
154
155 static SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
156 "IEEE 802.11s HWMP parameters");
157 static int ieee80211_hwmp_targetonly = 0;
158 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLFLAG_RW,
159 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
160 static int ieee80211_hwmp_pathtimeout = -1;
161 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
162 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
163 "path entry lifetime (ms)");
164 static int ieee80211_hwmp_maxpreq_retries = -1;
165 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, maxpreq_retries, CTLTYPE_INT | CTLFLAG_RW,
166 &ieee80211_hwmp_maxpreq_retries, 0, ieee80211_sysctl_msecs_ticks, "I",
167 "maximum number of preq retries");
168 static int ieee80211_hwmp_net_diameter_traversaltime = -1;
169 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, net_diameter_traversal_time,
170 CTLTYPE_INT | CTLFLAG_RW, &ieee80211_hwmp_net_diameter_traversaltime, 0,
171 ieee80211_sysctl_msecs_ticks, "I",
172 "estimate travelse time across the MBSS (ms)");
173 static int ieee80211_hwmp_roottimeout = -1;
174 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
175 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
176 "root PREQ timeout (ms)");
177 static int ieee80211_hwmp_rootint = -1;
178 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
179 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
180 "root interval (ms)");
181 static int ieee80211_hwmp_rannint = -1;
182 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
183 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
184 "root announcement interval (ms)");
185 static struct timeval ieee80211_hwmp_rootconfint = { 0, 0 };
186 static int ieee80211_hwmp_rootconfint_internal = -1;
187 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootconfint, CTLTYPE_INT | CTLFLAG_RD,
188 &ieee80211_hwmp_rootconfint_internal, 0, ieee80211_sysctl_msecs_ticks, "I",
189 "root confirmation interval (ms) (read-only)");
190
191 #define IEEE80211_HWMP_DEFAULT_MAXHOPS 31
192
193 static ieee80211_recv_action_func hwmp_recv_action_meshpath;
194
195 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
196 .mpp_descr = "HWMP",
197 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP,
198 .mpp_discover = hwmp_discover,
199 .mpp_peerdown = hwmp_peerdown,
200 .mpp_senderror = hwmp_senderror,
201 .mpp_vattach = hwmp_vattach,
202 .mpp_vdetach = hwmp_vdetach,
203 .mpp_newstate = hwmp_newstate,
204 .mpp_privlen = sizeof(struct ieee80211_hwmp_route),
205 };
206 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
207 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
208 "mesh route inactivity timeout (ms)");
209
210
211 static void
212 ieee80211_hwmp_init(void)
213 {
214 /* Default values as per amendment */
215 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
216 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
217 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
218 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
219 ieee80211_hwmp_rootconfint_internal = msecs_to_ticks(2*1000);
220 ieee80211_hwmp_maxpreq_retries = 3;
221 /*
222 * (TU): A measurement of time equal to 1024 μs,
223 * 500 TU is 512 ms.
224 */
225 ieee80211_hwmp_net_diameter_traversaltime = msecs_to_ticks(512);
226
227 /*
228 * NB: I dont know how to make SYSCTL_PROC that calls ms to ticks
229 * and return a struct timeval...
230 */
231 ieee80211_hwmp_rootconfint.tv_usec =
232 ieee80211_hwmp_rootconfint_internal * 1000;
233
234 /*
235 * Register action frame handler.
236 */
237 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESH,
238 IEEE80211_ACTION_MESH_HWMP, hwmp_recv_action_meshpath);
239
240 /* NB: default is 5 secs per spec */
241 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
242
243 /*
244 * Register HWMP.
245 */
246 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
247 }
248 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
249
250 static void
251 hwmp_vattach(struct ieee80211vap *vap)
252 {
253 struct ieee80211_hwmp_state *hs;
254
255 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
256 ("not a mesh vap, opmode %d", vap->iv_opmode));
257
258 hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
259 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
260 if (hs == NULL) {
261 printf("%s: couldn't alloc HWMP state\n", __func__);
262 return;
263 }
264 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
265 callout_init(&hs->hs_roottimer, 1);
266 vap->iv_hwmp = hs;
267 }
268
269 static void
270 hwmp_vdetach(struct ieee80211vap *vap)
271 {
272 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
273
274 callout_drain(&hs->hs_roottimer);
275 IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP);
276 vap->iv_hwmp = NULL;
277 }
278
279 static int
280 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
281 {
282 enum ieee80211_state nstate = vap->iv_state;
283 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
284
285 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
286 __func__, ieee80211_state_name[ostate],
287 ieee80211_state_name[nstate], arg);
288
289 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
290 callout_drain(&hs->hs_roottimer);
291 if (nstate == IEEE80211_S_RUN)
292 hwmp_rootmode_setup(vap);
293 return 0;
294 }
295
296 /*
297 * Verify the length of an HWMP PREQ and return the number
298 * of destinations >= 1, if verification fails -1 is returned.
299 */
300 static int
301 verify_mesh_preq_len(struct ieee80211vap *vap,
302 const struct ieee80211_frame *wh, const uint8_t *iefrm)
303 {
304 int alloc_sz = -1;
305 int ndest = -1;
306 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
307 /* Originator External Address present */
308 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE;
309 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
310 } else {
311 /* w/o Originator External Address */
312 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ;
313 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
314 }
315 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
316
317 if(iefrm[1] != (alloc_sz)) {
318 IEEE80211_DISCARD(vap,
319 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
320 wh, NULL, "PREQ (AE=%s) with wrong len",
321 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "");
322 return (-1);
323 }
324 return ndest;
325 }
326
327 /*
328 * Verify the length of an HWMP PREP and returns 1 on success,
329 * otherwise -1.
330 */
331 static int
332 verify_mesh_prep_len(struct ieee80211vap *vap,
333 const struct ieee80211_frame *wh, const uint8_t *iefrm)
334 {
335 int alloc_sz = -1;
336 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
337 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
338 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
339 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
340 alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
341 if(alloc_sz < 0) {
342 IEEE80211_DISCARD(vap,
343 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
344 wh, NULL, "PREP (AE=%s) with wrong len",
345 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "");
346 return (-1);
347 }
348 return (1);
349 }
350
351 /*
352 * Verify the length of an HWMP PERR and return the number
353 * of destinations >= 1, if verification fails -1 is returned.
354 */
355 static int
356 verify_mesh_perr_len(struct ieee80211vap *vap,
357 const struct ieee80211_frame *wh, const uint8_t *iefrm)
358 {
359 int alloc_sz = -1;
360 const uint8_t *iefrm_t = iefrm;
361 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
362 int i;
363
364 if(ndest > IEEE80211_MESHPERR_MAXDEST) {
365 IEEE80211_DISCARD(vap,
366 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
367 wh, NULL, "PERR with wrong number of destionat (>19), %u",
368 ndest);
369 return (-1);
370 }
371
372 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
373 /* We need to check each destionation flag to know size */
374 for(i = 0; i<ndest; i++) {
375 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
376 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
377 else
378 iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
379 }
380
381 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
382 if(alloc_sz != iefrm[1]) {
383 IEEE80211_DISCARD(vap,
384 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
385 wh, NULL, "%s", "PERR with wrong len");
386 return (-1);
387 }
388 return ndest;
389 }
390
391 static int
392 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
393 const struct ieee80211_frame *wh,
394 const uint8_t *frm, const uint8_t *efrm)
395 {
396 struct ieee80211vap *vap = ni->ni_vap;
397 struct ieee80211_meshpreq_ie *preq;
398 struct ieee80211_meshprep_ie *prep;
399 struct ieee80211_meshperr_ie *perr;
400 struct ieee80211_meshrann_ie rann;
401 const uint8_t *iefrm = frm + 2; /* action + code */
402 const uint8_t *iefrm_t = iefrm; /* temporary pointer */
403 int ndest = -1;
404 int found = 0;
405
406 while (efrm - iefrm > 1) {
407 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
408 switch (*iefrm) {
409 case IEEE80211_ELEMID_MESHPREQ:
410 {
411 int i = 0;
412
413 iefrm_t = iefrm;
414 ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
415 if (ndest < 0) {
416 vap->iv_stats.is_rx_mgtdiscard++;
417 break;
418 }
419 preq = IEEE80211_MALLOC(sizeof(*preq) +
420 (ndest - 1) * sizeof(*preq->preq_targets),
421 M_80211_MESH_PREQ,
422 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
423 KASSERT(preq != NULL, ("preq == NULL"));
424
425 preq->preq_ie = *iefrm_t++;
426 preq->preq_len = *iefrm_t++;
427 preq->preq_flags = *iefrm_t++;
428 preq->preq_hopcount = *iefrm_t++;
429 preq->preq_ttl = *iefrm_t++;
430 preq->preq_id = le32dec(iefrm_t); iefrm_t += 4;
431 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
432 iefrm_t += 6;
433 preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4;
434 /* NB: may have Originator Proxied Address */
435 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
436 IEEE80211_ADDR_COPY(
437 preq->preq_orig_ext_addr, iefrm_t);
438 iefrm_t += 6;
439 }
440 preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4;
441 preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4;
442 preq->preq_tcount = *iefrm_t++;
443
444 for (i = 0; i < preq->preq_tcount; i++) {
445 preq->preq_targets[i].target_flags = *iefrm_t++;
446 IEEE80211_ADDR_COPY(
447 preq->preq_targets[i].target_addr, iefrm_t);
448 iefrm_t += 6;
449 preq->preq_targets[i].target_seq =
450 le32dec(iefrm_t);
451 iefrm_t += 4;
452 }
453
454 hwmp_recv_preq(vap, ni, wh, preq);
455 IEEE80211_FREE(preq, M_80211_MESH_PREQ);
456 found++;
457 break;
458 }
459 case IEEE80211_ELEMID_MESHPREP:
460 {
461 iefrm_t = iefrm;
462 ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
463 if (ndest < 0) {
464 vap->iv_stats.is_rx_mgtdiscard++;
465 break;
466 }
467 prep = IEEE80211_MALLOC(sizeof(*prep),
468 M_80211_MESH_PREP,
469 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
470 KASSERT(prep != NULL, ("prep == NULL"));
471
472 prep->prep_ie = *iefrm_t++;
473 prep->prep_len = *iefrm_t++;
474 prep->prep_flags = *iefrm_t++;
475 prep->prep_hopcount = *iefrm_t++;
476 prep->prep_ttl = *iefrm_t++;
477 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
478 iefrm_t += 6;
479 prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4;
480 /* NB: May have Target Proxied Address */
481 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
482 IEEE80211_ADDR_COPY(
483 prep->prep_target_ext_addr, iefrm_t);
484 iefrm_t += 6;
485 }
486 prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4;
487 prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4;
488 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
489 iefrm_t += 6;
490 prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4;
491
492 hwmp_recv_prep(vap, ni, wh, prep);
493 IEEE80211_FREE(prep, M_80211_MESH_PREP);
494 found++;
495 break;
496 }
497 case IEEE80211_ELEMID_MESHPERR:
498 {
499 int i = 0;
500
501 iefrm_t = iefrm;
502 ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
503 if (ndest < 0) {
504 vap->iv_stats.is_rx_mgtdiscard++;
505 break;
506 }
507 perr = IEEE80211_MALLOC(sizeof(*perr) +
508 (ndest - 1) * sizeof(*perr->perr_dests),
509 M_80211_MESH_PERR,
510 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
511 KASSERT(perr != NULL, ("perr == NULL"));
512
513 perr->perr_ie = *iefrm_t++;
514 perr->perr_len = *iefrm_t++;
515 perr->perr_ttl = *iefrm_t++;
516 perr->perr_ndests = *iefrm_t++;
517
518 for (i = 0; i<perr->perr_ndests; i++) {
519 perr->perr_dests[i].dest_flags = *iefrm_t++;
520 IEEE80211_ADDR_COPY(
521 perr->perr_dests[i].dest_addr, iefrm_t);
522 iefrm_t += 6;
523 perr->perr_dests[i].dest_seq = le32dec(iefrm_t);
524 iefrm_t += 4;
525 /* NB: May have Target Proxied Address */
526 if (perr->perr_dests[i].dest_flags &
527 IEEE80211_MESHPERR_FLAGS_AE) {
528 IEEE80211_ADDR_COPY(
529 perr->perr_dests[i].dest_ext_addr,
530 iefrm_t);
531 iefrm_t += 6;
532 }
533 perr->perr_dests[i].dest_rcode =
534 le16dec(iefrm_t);
535 iefrm_t += 2;
536 }
537
538 hwmp_recv_perr(vap, ni, wh, perr);
539 IEEE80211_FREE(perr, M_80211_MESH_PERR);
540 found++;
541 break;
542 }
543 case IEEE80211_ELEMID_MESHRANN:
544 {
545 const struct ieee80211_meshrann_ie *mrann =
546 (const struct ieee80211_meshrann_ie *) iefrm;
547 if (mrann->rann_len !=
548 sizeof(struct ieee80211_meshrann_ie) - 2) {
549 IEEE80211_DISCARD(vap,
550 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
551 wh, NULL, "%s", "RAN with wrong len");
552 vap->iv_stats.is_rx_mgtdiscard++;
553 return 1;
554 }
555 memcpy(&rann, mrann, sizeof(rann));
556 rann.rann_seq = le32dec(&mrann->rann_seq);
557 rann.rann_interval = le32dec(&mrann->rann_interval);
558 rann.rann_metric = le32dec(&mrann->rann_metric);
559 hwmp_recv_rann(vap, ni, wh, &rann);
560 found++;
561 break;
562 }
563 }
564 iefrm += iefrm[1] + 2;
565 }
566 if (!found) {
567 IEEE80211_DISCARD(vap,
568 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
569 wh, NULL, "%s", "PATH SEL action without IE");
570 vap->iv_stats.is_rx_mgtdiscard++;
571 }
572 return 0;
573 }
574
575 static int
576 hwmp_send_action(struct ieee80211vap *vap,
577 const uint8_t da[IEEE80211_ADDR_LEN],
578 uint8_t *ie, size_t len)
579 {
580 struct ieee80211_node *ni;
581 struct ieee80211com *ic;
582 struct ieee80211_bpf_params params;
583 struct mbuf *m;
584 uint8_t *frm;
585 int ret;
586
587 if (IEEE80211_IS_MULTICAST(da)) {
588 ni = ieee80211_ref_node(vap->iv_bss);
589 #ifdef IEEE80211_DEBUG_REFCNT
590 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
591 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
592 __func__, __LINE__,
593 ni, ether_sprintf(ni->ni_macaddr),
594 ieee80211_node_refcnt(ni)+1);
595 #endif
596 ieee80211_ref_node(ni);
597 }
598 else
599 ni = ieee80211_mesh_find_txnode(vap, da);
600
601 if (vap->iv_state == IEEE80211_S_CAC) {
602 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
603 "block %s frame in CAC state", "HWMP action");
604 vap->iv_stats.is_tx_badstate++;
605 return EIO; /* XXX */
606 }
607
608 KASSERT(ni != NULL, ("null node"));
609 ic = ni->ni_ic;
610
611 m = ieee80211_getmgtframe(&frm,
612 ic->ic_headroom + sizeof(struct ieee80211_frame),
613 sizeof(struct ieee80211_action) + len
614 );
615 if (m == NULL) {
616 ieee80211_free_node(ni);
617 vap->iv_stats.is_tx_nobuf++;
618 return ENOMEM;
619 }
620 *frm++ = IEEE80211_ACTION_CAT_MESH;
621 *frm++ = IEEE80211_ACTION_MESH_HWMP;
622 switch (*ie) {
623 case IEEE80211_ELEMID_MESHPREQ:
624 frm = hwmp_add_meshpreq(frm,
625 (struct ieee80211_meshpreq_ie *)ie);
626 break;
627 case IEEE80211_ELEMID_MESHPREP:
628 frm = hwmp_add_meshprep(frm,
629 (struct ieee80211_meshprep_ie *)ie);
630 break;
631 case IEEE80211_ELEMID_MESHPERR:
632 frm = hwmp_add_meshperr(frm,
633 (struct ieee80211_meshperr_ie *)ie);
634 break;
635 case IEEE80211_ELEMID_MESHRANN:
636 frm = hwmp_add_meshrann(frm,
637 (struct ieee80211_meshrann_ie *)ie);
638 break;
639 }
640
641 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
642 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
643 if (m == NULL) {
644 ieee80211_free_node(ni);
645 vap->iv_stats.is_tx_nobuf++;
646 return ENOMEM;
647 }
648
649 IEEE80211_TX_LOCK(ic);
650
651 ieee80211_send_setup(ni, m,
652 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
653 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr);
654
655 m->m_flags |= M_ENCAP; /* mark encapsulated */
656 IEEE80211_NODE_STAT(ni, tx_mgmt);
657
658 memset(¶ms, 0, sizeof(params));
659 params.ibp_pri = WME_AC_VO;
660 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
661 if (IEEE80211_IS_MULTICAST(da))
662 params.ibp_try0 = 1;
663 else
664 params.ibp_try0 = ni->ni_txparms->maxretry;
665 params.ibp_power = ni->ni_txpower;
666 ret = ieee80211_raw_output(vap, ni, m, ¶ms);
667 IEEE80211_TX_UNLOCK(ic);
668 return (ret);
669 }
670
671 #define ADDSHORT(frm, v) do { \
672 le16enc(frm, v); \
673 frm += 2; \
674 } while (0)
675 #define ADDWORD(frm, v) do { \
676 le32enc(frm, v); \
677 frm += 4; \
678 } while (0)
679 /*
680 * Add a Mesh Path Request IE to a frame.
681 */
682 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
683 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
684 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
685 static uint8_t *
686 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
687 {
688 int i;
689
690 *frm++ = IEEE80211_ELEMID_MESHPREQ;
691 *frm++ = preq->preq_len; /* len already calculated */
692 *frm++ = preq->preq_flags;
693 *frm++ = preq->preq_hopcount;
694 *frm++ = preq->preq_ttl;
695 ADDWORD(frm, preq->preq_id);
696 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
697 ADDWORD(frm, preq->preq_origseq);
698 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
699 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
700 frm += 6;
701 }
702 ADDWORD(frm, preq->preq_lifetime);
703 ADDWORD(frm, preq->preq_metric);
704 *frm++ = preq->preq_tcount;
705 for (i = 0; i < preq->preq_tcount; i++) {
706 *frm++ = PREQ_TFLAGS(i);
707 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
708 frm += 6;
709 ADDWORD(frm, PREQ_TSEQ(i));
710 }
711 return frm;
712 }
713 #undef PREQ_TFLAGS
714 #undef PREQ_TADDR
715 #undef PREQ_TSEQ
716
717 /*
718 * Add a Mesh Path Reply IE to a frame.
719 */
720 static uint8_t *
721 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
722 {
723 *frm++ = IEEE80211_ELEMID_MESHPREP;
724 *frm++ = prep->prep_len; /* len already calculated */
725 *frm++ = prep->prep_flags;
726 *frm++ = prep->prep_hopcount;
727 *frm++ = prep->prep_ttl;
728 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
729 ADDWORD(frm, prep->prep_targetseq);
730 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
731 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
732 frm += 6;
733 }
734 ADDWORD(frm, prep->prep_lifetime);
735 ADDWORD(frm, prep->prep_metric);
736 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
737 ADDWORD(frm, prep->prep_origseq);
738 return frm;
739 }
740
741 /*
742 * Add a Mesh Path Error IE to a frame.
743 */
744 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
745 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
746 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
747 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
748 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode
749 static uint8_t *
750 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
751 {
752 int i;
753
754 *frm++ = IEEE80211_ELEMID_MESHPERR;
755 *frm++ = perr->perr_len; /* len already calculated */
756 *frm++ = perr->perr_ttl;
757 *frm++ = perr->perr_ndests;
758 for (i = 0; i < perr->perr_ndests; i++) {
759 *frm++ = PERR_DFLAGS(i);
760 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
761 frm += 6;
762 ADDWORD(frm, PERR_DSEQ(i));
763 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
764 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
765 frm += 6;
766 }
767 ADDSHORT(frm, PERR_DRCODE(i));
768 }
769 return frm;
770 }
771 #undef PERR_DFLAGS
772 #undef PERR_DADDR
773 #undef PERR_DSEQ
774 #undef PERR_EXTADDR
775 #undef PERR_DRCODE
776
777 /*
778 * Add a Root Annoucement IE to a frame.
779 */
780 static uint8_t *
781 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
782 {
783 *frm++ = IEEE80211_ELEMID_MESHRANN;
784 *frm++ = rann->rann_len;
785 *frm++ = rann->rann_flags;
786 *frm++ = rann->rann_hopcount;
787 *frm++ = rann->rann_ttl;
788 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
789 ADDWORD(frm, rann->rann_seq);
790 ADDWORD(frm, rann->rann_interval);
791 ADDWORD(frm, rann->rann_metric);
792 return frm;
793 }
794
795 static void
796 hwmp_rootmode_setup(struct ieee80211vap *vap)
797 {
798 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
799 struct ieee80211_mesh_state *ms = vap->iv_mesh;
800
801 switch (hs->hs_rootmode) {
802 case IEEE80211_HWMP_ROOTMODE_DISABLED:
803 callout_drain(&hs->hs_roottimer);
804 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT;
805 break;
806 case IEEE80211_HWMP_ROOTMODE_NORMAL:
807 case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
808 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
809 hwmp_rootmode_cb, vap);
810 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
811 break;
812 case IEEE80211_HWMP_ROOTMODE_RANN:
813 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
814 hwmp_rootmode_rann_cb, vap);
815 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
816 break;
817 }
818 }
819
820 /*
821 * Send a broadcast Path Request to find all nodes on the mesh. We are
822 * called when the vap is configured as a HWMP root node.
823 */
824 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
825 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
826 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
827 static void
828 hwmp_rootmode_cb(void *arg)
829 {
830 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
831 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
832 struct ieee80211_mesh_state *ms = vap->iv_mesh;
833 struct ieee80211_meshpreq_ie preq;
834
835 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
836 "%s", "send broadcast PREQ");
837
838 preq.preq_flags = 0;
839 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
840 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
841 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
842 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
843 preq.preq_hopcount = 0;
844 preq.preq_ttl = ms->ms_ttl;
845 preq.preq_id = ++hs->hs_preqid;
846 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
847 preq.preq_origseq = ++hs->hs_seq;
848 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
849 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
850 preq.preq_tcount = 1;
851 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
852 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
853 IEEE80211_MESHPREQ_TFLAGS_USN;
854 PREQ_TSEQ(0) = 0;
855 vap->iv_stats.is_hwmp_rootreqs++;
856 /* NB: we enforce rate check ourself */
857 hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL);
858 hwmp_rootmode_setup(vap);
859 }
860 #undef PREQ_TFLAGS
861 #undef PREQ_TADDR
862 #undef PREQ_TSEQ
863
864 /*
865 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
866 * called when the vap is configured as a HWMP RANN root node.
867 */
868 static void
869 hwmp_rootmode_rann_cb(void *arg)
870 {
871 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
872 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
873 struct ieee80211_mesh_state *ms = vap->iv_mesh;
874 struct ieee80211_meshrann_ie rann;
875
876 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
877 "%s", "send broadcast RANN");
878
879 rann.rann_flags = 0;
880 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
881 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
882 rann.rann_hopcount = 0;
883 rann.rann_ttl = ms->ms_ttl;
884 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
885 rann.rann_seq = ++hs->hs_seq;
886 rann.rann_interval = ieee80211_hwmp_rannint;
887 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
888
889 vap->iv_stats.is_hwmp_rootrann++;
890 hwmp_send_rann(vap, broadcastaddr, &rann);
891 hwmp_rootmode_setup(vap);
892 }
893
894 /*
895 * Update forwarding information to TA if metric improves.
896 */
897 static void
898 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni,
899 const char *hwmp_frame)
900 {
901 struct ieee80211_mesh_state *ms = vap->iv_mesh;
902 struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */
903 int metric = 0;
904
905 rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
906 if (rttran == NULL) {
907 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr);
908 if (rttran == NULL) {
909 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
910 "unable to add path to transmitter %6D of %s",
911 ni->ni_macaddr, ":", hwmp_frame);
912 vap->iv_stats.is_mesh_rtaddfailed++;
913 return;
914 }
915 }
916 metric = ms->ms_pmetric->mpm_metric(ni);
917 if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) ||
918 rttran->rt_metric > metric)
919 {
920 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
921 "%s path to transmiter %6D of %s, metric %d:%d",
922 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
923 "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame,
924 rttran->rt_metric, metric);
925 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr);
926 rttran->rt_metric = metric;
927 rttran->rt_nhops = 1;
928 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact);
929 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
930 }
931 }
932
933 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
934 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
935 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
936 static void
937 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
938 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
939 {
940 struct ieee80211_mesh_state *ms = vap->iv_mesh;
941 struct ieee80211_mesh_route *rtorig = NULL;
942 struct ieee80211_mesh_route *rtorig_ext = NULL;
943 struct ieee80211_mesh_route *rttarg = NULL;
944 struct ieee80211_hwmp_route *hrorig = NULL;
945 struct ieee80211_hwmp_route *hrtarg = NULL;
946 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
947 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */
948 uint32_t metric = 0;
949
950 /*
951 * Ignore PREQs from us. Could happen because someone forward it
952 * back to us.
953 */
954 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
955 return;
956
957 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
958 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
959 PREQ_TADDR(0), ":");
960
961 /*
962 * Acceptance criteria: (if the PREQ is not for us or not broadcast,
963 * or an external mac address not proxied by us),
964 * AND forwarding is disabled, discard this PREQ.
965 */
966 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
967 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
968 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
969 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
970 (rttarg != NULL &&
971 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
972 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
973 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
974 preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
975 return;
976 }
977 /*
978 * Acceptance criteria: if unicast addressed
979 * AND no valid forwarding for Target of PREQ, discard this PREQ.
980 */
981 if(rttarg != NULL)
982 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
983 struct ieee80211_hwmp_route);
984 /* Address mode: ucast */
985 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
986 rttarg == NULL &&
987 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
988 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
989 preq->preq_origaddr, NULL,
990 "unicast addressed PREQ of unknown target %6D",
991 PREQ_TADDR(0), ":");
992 return;
993 }
994
995 /* PREQ ACCEPTED */
996
997 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
998 if (rtorig == NULL) {
999 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
1000 if (rtorig == NULL) {
1001 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1002 "unable to add orig path to %6D",
1003 preq->preq_origaddr, ":");
1004 vap->iv_stats.is_mesh_rtaddfailed++;
1005 return;
1006 }
1007 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1008 "adding originator %6D", preq->preq_origaddr, ":");
1009 }
1010 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
1011
1012 /* record last seen preqid */
1013 preqid = hrorig->hr_preqid;
1014 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
1015
1016 /* Data creation and update of forwarding information
1017 * according to Table 11C-8 for originator mesh STA.
1018 */
1019 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
1020 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
1021 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
1022 metric < rtorig->rt_metric)) {
1023 hrorig->hr_seq = preq->preq_origseq;
1024 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
1025 rtorig->rt_metric = metric;
1026 rtorig->rt_nhops = preq->preq_hopcount + 1;
1027 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
1028 /* Path to orig is valid now.
1029 * NB: we know it can't be Proxy, and if it is GATE
1030 * it will be marked below.
1031 */
1032 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
1033 } else if ((hrtarg != NULL &&
1034 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
1035 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1036 preqid >= preq->preq_id)) {
1037 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1038 "discard PREQ from %6D, old seqno %u <= %u,"
1039 " or old preqid %u < %u",
1040 preq->preq_origaddr, ":",
1041 preq->preq_origseq, hrorig->hr_seq,
1042 preq->preq_id, preqid);
1043 return;
1044 }
1045
1046 /* Update forwarding information to TA if metric improves. */
1047 hwmp_update_transmitter(vap, ni, "PREQ");
1048
1049 /*
1050 * Check if the PREQ is addressed to us.
1051 * or a Proxy currently gated by us.
1052 */
1053 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
1054 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE &&
1055 rttarg != NULL &&
1056 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) &&
1057 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
1058 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1059 struct ieee80211_meshprep_ie prep;
1060
1061 /*
1062 * When we are the target we shall update our own HWMP seq
1063 * number with max of (current and preq->seq) + 1
1064 */
1065 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
1066
1067 prep.prep_flags = 0;
1068 prep.prep_hopcount = 0;
1069 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1070 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
1071 if (rttarg != NULL && /* if NULL it means we are the target */
1072 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1073 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1074 "reply for proxy %6D", rttarg->rt_dest, ":");
1075 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
1076 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
1077 rttarg->rt_dest);
1078 /* update proxy seqno to HWMP seqno */
1079 rttarg->rt_ext_seq = hs->hs_seq;
1080 prep.prep_hopcount = rttarg->rt_nhops;
1081 prep.prep_metric = rttarg->rt_metric;
1082 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
1083 }
1084 /*
1085 * Build and send a PREP frame.
1086 */
1087 prep.prep_ttl = ms->ms_ttl;
1088 prep.prep_targetseq = hs->hs_seq;
1089 prep.prep_lifetime = preq->preq_lifetime;
1090 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
1091 prep.prep_origseq = preq->preq_origseq;
1092
1093 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1094 "reply to %6D", preq->preq_origaddr, ":");
1095 hwmp_send_prep(vap, wh->i_addr2, &prep);
1096 return;
1097 }
1098 /* we may update our proxy information for the orig external */
1099 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
1100 rtorig_ext =
1101 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
1102 if (rtorig_ext == NULL) {
1103 rtorig_ext = ieee80211_mesh_rt_add(vap,
1104 preq->preq_orig_ext_addr);
1105 if (rtorig_ext == NULL) {
1106 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1107 "unable to add orig ext proxy to %6D",
1108 preq->preq_orig_ext_addr, ":");
1109 vap->iv_stats.is_mesh_rtaddfailed++;
1110 return;
1111 }
1112 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
1113 preq->preq_origaddr);
1114 }
1115 rtorig_ext->rt_ext_seq = preq->preq_origseq;
1116 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
1117 }
1118 /*
1119 * Proactive PREQ: reply with a proactive PREP to the
1120 * root STA if requested.
1121 */
1122 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
1123 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
1124 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1125 "root mesh station @ %6D", preq->preq_origaddr, ":");
1126
1127 /* Check if root is a mesh gate, mark it */
1128 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) {
1129 struct ieee80211_mesh_gate_route *gr;
1130
1131 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1132 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr,
1133 rtorig);
1134 gr->gr_lastseq = 0; /* NOT GANN */
1135 }
1136
1137 /*
1138 * Reply with a PREP if we don't have a path to the root
1139 * or if the root sent us a proactive PREQ.
1140 */
1141 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1142 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
1143 struct ieee80211_meshprep_ie prep;
1144
1145 prep.prep_flags = 0;
1146 prep.prep_hopcount = 0;
1147 prep.prep_ttl = ms->ms_ttl;
1148 IEEE80211_ADDR_COPY(prep.prep_origaddr,
1149 preq->preq_origaddr);
1150 prep.prep_origseq = preq->preq_origseq;
1151 prep.prep_lifetime = preq->preq_lifetime;
1152 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1153 IEEE80211_ADDR_COPY(prep.prep_targetaddr,
1154 vap->iv_myaddr);
1155 prep.prep_targetseq = ++hs->hs_seq;
1156 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1157 }
1158 }
1159
1160 /*
1161 * Forwarding and Intermediate reply for PREQs with 1 target.
1162 */
1163 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
1164 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1165 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
1166
1167 memcpy(&ppreq, preq, sizeof(ppreq));
1168
1169 /*
1170 * We have a valid route to this node.
1171 * NB: if target is proxy dont reply.
1172 */
1173 if (rttarg != NULL &&
1174 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1175 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
1176 /*
1177 * Check if we can send an intermediate Path Reply,
1178 * i.e., Target Only bit is not set and target is not
1179 * the MAC broadcast address.
1180 */
1181 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
1182 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
1183 struct ieee80211_meshprep_ie prep;
1184
1185 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1186 "intermediate reply for PREQ from %6D",
1187 preq->preq_origaddr, ":");
1188 prep.prep_flags = 0;
1189 prep.prep_hopcount = rttarg->rt_nhops;
1190 prep.prep_ttl = ms->ms_ttl;
1191 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
1192 PREQ_TADDR(0));
1193 prep.prep_targetseq = hrtarg->hr_seq;
1194 prep.prep_lifetime = preq->preq_lifetime;
1195 prep.prep_metric =rttarg->rt_metric;
1196 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
1197 preq->preq_origaddr);
1198 prep.prep_origseq = hrorig->hr_seq;
1199 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1200
1201 /*
1202 * Set TO and unset RF bits because we have
1203 * sent a PREP.
1204 */
1205 ppreq.preq_targets[0].target_flags |=
1206 IEEE80211_MESHPREQ_TFLAGS_TO;
1207 }
1208 }
1209
1210 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1211 "forward PREQ from %6D",
1212 preq->preq_origaddr, ":");
1213 ppreq.preq_hopcount += 1;
1214 ppreq.preq_ttl -= 1;
1215 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
1216
1217 /* don't do PREQ ratecheck when we propagate */
1218 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL);
1219 }
1220 }
1221 #undef PREQ_TFLAGS
1222 #undef PREQ_TADDR
1223 #undef PREQ_TSEQ
1224
1225 static int
1226 hwmp_send_preq(struct ieee80211vap *vap,
1227 const uint8_t da[IEEE80211_ADDR_LEN],
1228 struct ieee80211_meshpreq_ie *preq,
1229 struct timeval *last, struct timeval *minint)
1230 {
1231
1232 /*
1233 * Enforce PREQ interval.
1234 * NB: Proactive ROOT PREQs rate is handled by cb task.
1235 */
1236 if (last != NULL && minint != NULL) {
1237 if (ratecheck(last, minint) == 0)
1238 return EALREADY; /* XXX: we should postpone */
1239 getmicrouptime(last);
1240 }
1241
1242 /*
1243 * mesh preq action frame format
1244 * [6] da
1245 * [6] sa
1246 * [6] addr3 = sa
1247 * [1] action
1248 * [1] category
1249 * [tlv] mesh path request
1250 */
1251 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
1252 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
1253 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
1254 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
1255 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2);
1256 }
1257
1258 static void
1259 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
1260 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
1261 {
1262 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
1263 #define PROXIED_BY_US(rt) \
1264 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
1265 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1266 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1267 struct ieee80211_mesh_route *rt = NULL;
1268 struct ieee80211_mesh_route *rtorig = NULL;
1269 struct ieee80211_mesh_route *rtext = NULL;
1270 struct ieee80211_hwmp_route *hr;
1271 struct ieee80211com *ic = vap->iv_ic;
1272 struct mbuf *m, *next;
1273 uint32_t metric = 0;
1274 const uint8_t *addr;
1275
1276 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1277 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
1278 prep->prep_targetaddr, ":");
1279
1280 /*
1281 * Acceptance criteria: (If the corresponding PREP was not generated
1282 * by us OR not generated by an external mac that is not proxied by us)
1283 * AND forwarding is disabled, discard this PREP.
1284 */
1285 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
1286 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
1287 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
1288 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
1289 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1290 "discard PREP, orig(%6D) not proxied or generated by us",
1291 prep->prep_origaddr, ":");
1292 return;
1293 }
1294
1295 /* PREP ACCEPTED */
1296
1297 /*
1298 * If accepted shall create or update the active forwarding information
1299 * it maintains for the target mesh STA of the PREP (according to the
1300 * rules defined in 13.10.8.4). If the conditions for creating or
1301 * updating the forwarding information have not been met in those
1302 * rules, no further steps are applied to the PREP.
1303 */
1304 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
1305 if (rt == NULL) {
1306 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
1307 if (rt == NULL) {
1308 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1309 "unable to add PREP path to %6D",
1310 prep->prep_targetaddr, ":");
1311 vap->iv_stats.is_mesh_rtaddfailed++;
1312 return;
1313 }
1314 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1315 "adding target %6D", prep->prep_targetaddr, ":");
1316 }
1317 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1318 /* update path metric */
1319 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
1320 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1321 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
1322 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1323 "discard PREP from %6D, old seq no %u < %u",
1324 prep->prep_targetaddr, ":",
1325 prep->prep_targetseq, hr->hr_seq);
1326 return;
1327 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
1328 metric > rt->rt_metric) {
1329 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1330 "discard PREP from %6D, new metric %u > %u",
1331 prep->prep_targetaddr, ":",
1332 metric, rt->rt_metric);
1333 return;
1334 }
1335 }
1336
1337 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1338 "%s path to %6D, hopcount %d:%d metric %d:%d",
1339 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1340 "prefer" : "update",
1341 prep->prep_targetaddr, ":",
1342 rt->rt_nhops, prep->prep_hopcount + 1,
1343 rt->rt_metric, metric);
1344
1345 hr->hr_seq = prep->prep_targetseq;
1346 hr->hr_preqretries = 0;
1347 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
1348 rt->rt_metric = metric;
1349 rt->rt_nhops = prep->prep_hopcount + 1;
1350 ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
1351 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1352 /* discovery complete */
1353 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
1354 }
1355 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
1356
1357 /* Update forwarding information to TA if metric improves */
1358 hwmp_update_transmitter(vap, ni, "PREP");
1359
1360 /*
1361 * If it's NOT for us, propagate the PREP
1362 */
1363 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
1364 prep->prep_ttl > 1 &&
1365 prep->prep_hopcount < hs->hs_maxhops) {
1366 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1367 /*
1368 * NB: We should already have setup the path to orig
1369 * mesh STA when we propagated PREQ to target mesh STA,
1370 * no PREP is generated without a corresponding PREQ.
1371 * XXX: for now just ignore.
1372 */
1373 if (rtorig == NULL) {
1374 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1375 "received PREP for an unknown orig(%6D)",
1376 prep->prep_origaddr, ":");
1377 return;
1378 }
1379
1380 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1381 "propagate PREP from %6D",
1382 prep->prep_targetaddr, ":");
1383
1384 memcpy(&pprep, prep, sizeof(pprep));
1385 pprep.prep_hopcount += 1;
1386 pprep.prep_ttl -= 1;
1387 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1388 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep);
1389
1390 /* precursor list for the Target Mesh STA Address is updated */
1391 }
1392
1393 /*
1394 * Check if we received a PREP w/ AE and store target external address.
1395 * We may store target external address if recevied PREP w/ AE
1396 * and we are not final destination
1397 */
1398 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
1399 rtext = ieee80211_mesh_rt_find(vap,
1400 prep->prep_target_ext_addr);
1401 if (rtext == NULL) {
1402 rtext = ieee80211_mesh_rt_add(vap,
1403 prep->prep_target_ext_addr);
1404 if (rtext == NULL) {
1405 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1406 "unable to add PREP path to proxy %6D",
1407 prep->prep_targetaddr, ":");
1408 vap->iv_stats.is_mesh_rtaddfailed++;
1409 return;
1410 }
1411 }
1412 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1413 "%s path to %6D, hopcount %d:%d metric %d:%d",
1414 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1415 "prefer" : "update",
1416 prep->prep_target_ext_addr, ":",
1417 rtext->rt_nhops, prep->prep_hopcount + 1,
1418 rtext->rt_metric, metric);
1419
1420 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
1421 IEEE80211_MESHRT_FLAGS_VALID;
1422 IEEE80211_ADDR_COPY(rtext->rt_dest,
1423 prep->prep_target_ext_addr);
1424 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
1425 prep->prep_targetaddr);
1426 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
1427 rtext->rt_metric = metric;
1428 rtext->rt_lifetime = prep->prep_lifetime;
1429 rtext->rt_nhops = prep->prep_hopcount + 1;
1430 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
1431 /*
1432 * XXX: proxy entries have no HWMP priv data,
1433 * nullify them to be sure?
1434 */
1435 }
1436 /*
1437 * Check for frames queued awaiting path discovery.
1438 * XXX probably can tell exactly and avoid remove call
1439 * NB: hash may have false matches, if so they will get
1440 * stuck back on the stageq because there won't be
1441 * a path.
1442 */
1443 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1444 prep->prep_target_ext_addr : prep->prep_targetaddr;
1445 m = ieee80211_ageq_remove(&ic->ic_stageq,
1446 (struct ieee80211_node *)(uintptr_t)
1447 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
1448
1449 /*
1450 * All frames in the stageq here should be non-M_ENCAP; or things
1451 * will get very unhappy.
1452 */
1453 for (; m != NULL; m = next) {
1454 next = m->m_nextpkt;
1455 m->m_nextpkt = NULL;
1456 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1457 "flush queued frame %p len %d", m, m->m_pkthdr.len);
1458 /*
1459 * If the mbuf has M_ENCAP set, ensure we free it.
1460 * Note that after if_transmit() is called, m is invalid.
1461 */
1462 (void) ieee80211_vap_xmitpkt(vap, m);
1463 }
1464 #undef IS_PROXY
1465 #undef PROXIED_BY_US
1466 }
1467
1468 static int
1469 hwmp_send_prep(struct ieee80211vap *vap,
1470 const uint8_t da[IEEE80211_ADDR_LEN],
1471 struct ieee80211_meshprep_ie *prep)
1472 {
1473 /* NB: there's no PREP minimum interval. */
1474
1475 /*
1476 * mesh prep action frame format
1477 * [6] da
1478 * [6] sa
1479 * [6] addr3 = sa
1480 * [1] action
1481 * [1] category
1482 * [tlv] mesh path reply
1483 */
1484 prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1485 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1486 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
1487 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2);
1488 }
1489
1490 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1491 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1492 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1493 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1494 static void
1495 hwmp_peerdown(struct ieee80211_node *ni)
1496 {
1497 struct ieee80211vap *vap = ni->ni_vap;
1498 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1499 struct ieee80211_meshperr_ie perr;
1500 struct ieee80211_mesh_route *rt;
1501 struct ieee80211_hwmp_route *hr;
1502
1503 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1504 if (rt == NULL)
1505 return;
1506 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1507 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1508 "%s", "delete route entry");
1509 perr.perr_ttl = ms->ms_ttl;
1510 perr.perr_ndests = 1;
1511 PERR_DFLAGS(0) = 0;
1512 if (hr->hr_seq == 0)
1513 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1514 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1515 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1516 PERR_DSEQ(0) = ++hr->hr_seq;
1517 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1518 /* NB: flush everything passing through peer */
1519 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1520 hwmp_send_perr(vap, broadcastaddr, &perr);
1521 }
1522 #undef PERR_DFLAGS
1523 #undef PERR_DADDR
1524 #undef PERR_DSEQ
1525 #undef PERR_DRCODE
1526
1527 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
1528 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
1529 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
1530 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr
1531 static void
1532 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1533 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1534 {
1535 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1536 struct ieee80211_mesh_route *rt = NULL;
1537 struct ieee80211_mesh_route *rt_ext = NULL;
1538 struct ieee80211_hwmp_route *hr;
1539 struct ieee80211_meshperr_ie *pperr = NULL;
1540 int i, j = 0, forward = 0;
1541
1542 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1543 "received PERR from %6D", wh->i_addr2, ":");
1544
1545 /*
1546 * if forwarding is true, prepare pperr
1547 */
1548 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1549 forward = 1;
1550 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
1551 M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */
1552 }
1553
1554 /*
1555 * Acceptance criteria: check if we have forwarding information
1556 * stored about destination, and that nexthop == TA of this PERR.
1557 * NB: we also build a new PERR to propagate in case we should forward.
1558 */
1559 for (i = 0; i < perr->perr_ndests; i++) {
1560 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1561 if (rt == NULL)
1562 continue;
1563 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
1564 continue;
1565
1566 /* found and accepted a PERR ndest element, process it... */
1567 if (forward)
1568 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
1569 sizeof(*perr->perr_dests));
1570 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1571 switch(PERR_DFLAGS(i)) {
1572 case (IEEE80211_REASON_MESH_PERR_NO_FI):
1573 if (PERR_DSEQ(i) == 0) {
1574 hr->hr_seq++;
1575 if (forward) {
1576 pperr->perr_dests[j].dest_seq =
1577 hr->hr_seq;
1578 }
1579 } else {
1580 hr->hr_seq = PERR_DSEQ(i);
1581 }
1582 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1583 j++;
1584 break;
1585 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
1586 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
1587 hr->hr_seq = PERR_DSEQ(i);
1588 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1589 j++;
1590 }
1591 break;
1592 case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
1593 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
1594 if (rt_ext != NULL) {
1595 rt_ext->rt_flags &=
1596 ~IEEE80211_MESHRT_FLAGS_VALID;
1597 j++;
1598 }
1599 break;
1600 default:
1601 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1602 "PERR, unknown reason code %u\n", PERR_DFLAGS(i));
1603 goto done; /* XXX: stats?? */
1604 }
1605 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i));
1606 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
1607 }
1608 if (j == 0) {
1609 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
1610 "PERR not accepted");
1611 goto done; /* XXX: stats?? */
1612 }
1613
1614 /*
1615 * Propagate the PERR if we previously found it on our routing table.
1616 */
1617 if (forward && perr->perr_ttl > 1) {
1618 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1619 "propagate PERR from %6D", wh->i_addr2, ":");
1620 pperr->perr_ndests = j;
1621 pperr->perr_ttl--;
1622 hwmp_send_perr(vap, broadcastaddr, pperr);
1623 }
1624 done:
1625 if (pperr != NULL)
1626 IEEE80211_FREE(pperr, M_80211_MESH_PERR);
1627 }
1628 #undef PERR_DFLAGS
1629 #undef PERR_DADDR
1630 #undef PERR_DSEQ
1631 #undef PERR_DEXTADDR
1632
1633 static int
1634 hwmp_send_perr(struct ieee80211vap *vap,
1635 const uint8_t da[IEEE80211_ADDR_LEN],
1636 struct ieee80211_meshperr_ie *perr)
1637 {
1638 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1639 int i;
1640 uint8_t length = 0;
1641
1642 /*
1643 * Enforce PERR interval.
1644 */
1645 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1646 return EALREADY;
1647 getmicrouptime(&hs->hs_lastperr);
1648
1649 /*
1650 * mesh perr action frame format
1651 * [6] da
1652 * [6] sa
1653 * [6] addr3 = sa
1654 * [1] action
1655 * [1] category
1656 * [tlv] mesh path error
1657 */
1658 perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1659 length = IEEE80211_MESHPERR_BASE_SZ;
1660 for (i = 0; i<perr->perr_ndests; i++) {
1661 if (perr->perr_dests[i].dest_flags &
1662 IEEE80211_MESHPERR_FLAGS_AE) {
1663 length += IEEE80211_MESHPERR_DEST_SZ_AE;
1664 continue ;
1665 }
1666 length += IEEE80211_MESHPERR_DEST_SZ;
1667 }
1668 perr->perr_len =length;
1669 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2);
1670 }
1671
1672 /*
1673 * Called from the rest of the net80211 code (mesh code for example).
1674 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
1675 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
1676 */
1677 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1678 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1679 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1680 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr
1681 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1682 static void
1683 hwmp_senderror(struct ieee80211vap *vap,
1684 const uint8_t addr[IEEE80211_ADDR_LEN],
1685 struct ieee80211_mesh_route *rt, int rcode)
1686 {
1687 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1688 struct ieee80211_hwmp_route *hr = NULL;
1689 struct ieee80211_meshperr_ie perr;
1690
1691 if (rt != NULL)
1692 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1693 struct ieee80211_hwmp_route);
1694
1695 perr.perr_ndests = 1;
1696 perr.perr_ttl = ms->ms_ttl;
1697 PERR_DFLAGS(0) = 0;
1698 PERR_DRCODE(0) = rcode;
1699
1700 switch (rcode) {
1701 case IEEE80211_REASON_MESH_PERR_NO_FI:
1702 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1703 PERR_DSEQ(0) = 0; /* reserved */
1704 break;
1705 case IEEE80211_REASON_MESH_PERR_NO_PROXY:
1706 KASSERT(rt != NULL, ("no proxy info for sending PERR"));
1707 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
1708 ("route is not marked proxy"));
1709 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
1710 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
1711 PERR_DSEQ(0) = rt->rt_ext_seq;
1712 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
1713 break;
1714 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
1715 KASSERT(rt != NULL, ("no route info for sending PERR"));
1716 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1717 PERR_DSEQ(0) = hr->hr_seq;
1718 break;
1719 default:
1720 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
1721 }
1722 hwmp_send_perr(vap, broadcastaddr, &perr);
1723 }
1724 #undef PERR_DFLAGS
1725 #undef PEER_DADDR
1726 #undef PERR_DSEQ
1727 #undef PERR_DEXTADDR
1728 #undef PERR_DRCODE
1729
1730 static void
1731 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1732 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1733 {
1734 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1735 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1736 struct ieee80211_mesh_route *rt = NULL;
1737 struct ieee80211_hwmp_route *hr;
1738 struct ieee80211_meshpreq_ie preq;
1739 struct ieee80211_meshrann_ie prann;
1740
1741 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
1742 return;
1743
1744 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1745 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
1746 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1747
1748 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
1749 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
1750 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1751 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
1752 return;
1753 }
1754
1755 /* Acceptance criteria: if RANN.seq == stored seq AND
1756 * RANN.metric > stored metric, discard RANN */
1757 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
1758 rann->rann_metric > rt->rt_metric) {
1759 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1760 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
1761 return;
1762 }
1763 }
1764
1765 /* RANN ACCEPTED */
1766
1767 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
1768
1769 if (rt == NULL) {
1770 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
1771 if (rt == NULL) {
1772 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1773 "unable to add mac for RANN root %6D",
1774 rann->rann_addr, ":");
1775 vap->iv_stats.is_mesh_rtaddfailed++;
1776 return;
1777 }
1778 }
1779 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1780 /* Check if root is a mesh gate, mark it */
1781 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) {
1782 struct ieee80211_mesh_gate_route *gr;
1783
1784 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1785 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr,
1786 rt);
1787 gr->gr_lastseq = 0; /* NOT GANN */
1788 }
1789 /* discovery timeout */
1790 ieee80211_mesh_rt_update(rt,
1791 ticks_to_msecs(ieee80211_hwmp_roottimeout));
1792
1793 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
1794 preq.preq_hopcount = 0;
1795 preq.preq_ttl = ms->ms_ttl;
1796 preq.preq_id = 0; /* reserved */
1797 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1798 preq.preq_origseq = ++hs->hs_seq;
1799 preq.preq_lifetime = ieee80211_hwmp_roottimeout;
1800 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1801 preq.preq_tcount = 1;
1802 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
1803 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
1804 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
1805 preq.preq_targets[0].target_seq = rann->rann_seq;
1806 /* XXX: if rootconfint have not passed, we built this preq in vain */
1807 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf,
1808 &ieee80211_hwmp_rootconfint);
1809
1810 /* propagate a RANN */
1811 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1812 rann->rann_ttl > 1 &&
1813 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1814 hr->hr_seq = rann->rann_seq;
1815 memcpy(&prann, rann, sizeof(prann));
1816 prann.rann_hopcount += 1;
1817 prann.rann_ttl -= 1;
1818 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
1819 hwmp_send_rann(vap, broadcastaddr, &prann);
1820 }
1821 }
1822
1823 static int
1824 hwmp_send_rann(struct ieee80211vap *vap,
1825 const uint8_t da[IEEE80211_ADDR_LEN],
1826 struct ieee80211_meshrann_ie *rann)
1827 {
1828 /*
1829 * mesh rann action frame format
1830 * [6] da
1831 * [6] sa
1832 * [6] addr3 = sa
1833 * [1] action
1834 * [1] category
1835 * [tlv] root annoucement
1836 */
1837 rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
1838 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
1839 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2);
1840 }
1841
1842 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
1843 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
1844 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
1845 static void
1846 hwmp_rediscover_cb(void *arg)
1847 {
1848 struct ieee80211_mesh_route *rt = arg;
1849 struct ieee80211vap *vap = rt->rt_vap;
1850 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1851 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1852 struct ieee80211_hwmp_route *hr;
1853 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
1854
1855 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
1856 return ; /* nothing to do */
1857
1858 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1859 if (hr->hr_preqretries >=
1860 ieee80211_hwmp_maxpreq_retries) {
1861 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY,
1862 rt->rt_dest, "%s",
1863 "max number of discovery, send queued frames to GATE");
1864 ieee80211_mesh_forward_to_gates(vap, rt);
1865 vap->iv_stats.is_mesh_fwd_nopath++;
1866 return ; /* XXX: flush queue? */
1867 }
1868
1869 hr->hr_preqretries++;
1870
1871
1872 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
1873 "start path rediscovery , target seq %u", hr->hr_seq);
1874 /*
1875 * Try to discover the path for this node.
1876 * Group addressed PREQ Case A
1877 */
1878 preq.preq_flags = 0;
1879 preq.preq_hopcount = 0;
1880 preq.preq_ttl = ms->ms_ttl;
1881 preq.preq_id = ++hs->hs_preqid;
1882 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1883 preq.preq_origseq = hr->hr_origseq;
1884 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1885 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1886 preq.preq_tcount = 1;
1887 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
1888 PREQ_TFLAGS(0) = 0;
1889 if (ieee80211_hwmp_targetonly)
1890 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1891 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1892 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1893 /* XXX check return value */
1894 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq,
1895 &ieee80211_hwmp_preqminint);
1896 callout_reset(&rt->rt_discovery,
1897 ieee80211_hwmp_net_diameter_traversaltime * 2,
1898 hwmp_rediscover_cb, rt);
1899 }
1900
1901 static struct ieee80211_node *
1902 hwmp_discover(struct ieee80211vap *vap,
1903 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
1904 {
1905 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1906 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1907 struct ieee80211_mesh_route *rt = NULL;
1908 struct ieee80211_hwmp_route *hr;
1909 struct ieee80211_meshpreq_ie preq;
1910 struct ieee80211_node *ni;
1911 int sendpreq = 0;
1912
1913 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1914 ("not a mesh vap, opmode %d", vap->iv_opmode));
1915
1916 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
1917 ("%s: discovering self!", __func__));
1918
1919 ni = NULL;
1920 if (!IEEE80211_IS_MULTICAST(dest)) {
1921 rt = ieee80211_mesh_rt_find(vap, dest);
1922 if (rt == NULL) {
1923 rt = ieee80211_mesh_rt_add(vap, dest);
1924 if (rt == NULL) {
1925 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
1926 ni, "unable to add discovery path to %6D",
1927 dest, ":");
1928 vap->iv_stats.is_mesh_rtaddfailed++;
1929 goto done;
1930 }
1931 }
1932 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1933 struct ieee80211_hwmp_route);
1934 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1935 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1936 "%s", "already discovering queue frame until path found");
1937 sendpreq = 1;
1938 goto done;
1939 }
1940 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
1941 if (hr->hr_lastdiscovery != 0 &&
1942 (ticks - hr->hr_lastdiscovery <
1943 (ieee80211_hwmp_net_diameter_traversaltime * 2))) {
1944 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1945 dest, NULL, "%s",
1946 "too frequent discovery requeust");
1947 sendpreq = 1;
1948 goto done;
1949 }
1950 hr->hr_lastdiscovery = ticks;
1951 if (hr->hr_preqretries >=
1952 ieee80211_hwmp_maxpreq_retries) {
1953 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
1954 dest, NULL, "%s",
1955 "no valid path , max number of discovery");
1956 vap->iv_stats.is_mesh_fwd_nopath++;
1957 goto done;
1958 }
1959 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
1960 hr->hr_preqretries++;
1961 if (hr->hr_origseq == 0)
1962 hr->hr_origseq = ++hs->hs_seq;
1963 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1964 sendpreq = 1;
1965 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1966 "start path discovery (src %s), target seq %u",
1967 m == NULL ? "<none>" : ether_sprintf(
1968 mtod(m, struct ether_header *)->ether_shost),
1969 hr->hr_seq);
1970 /*
1971 * Try to discover the path for this node.
1972 * Group addressed PREQ Case A
1973 */
1974 preq.preq_flags = 0;
1975 preq.preq_hopcount = 0;
1976 preq.preq_ttl = ms->ms_ttl;
1977 preq.preq_id = ++hs->hs_preqid;
1978 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1979 preq.preq_origseq = hr->hr_origseq;
1980 preq.preq_lifetime =
1981 ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1982 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1983 preq.preq_tcount = 1;
1984 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
1985 PREQ_TFLAGS(0) = 0;
1986 if (ieee80211_hwmp_targetonly)
1987 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1988 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1989 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
1990 /* XXX check return value */
1991 hwmp_send_preq(vap, broadcastaddr, &preq,
1992 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint);
1993 callout_reset(&rt->rt_discovery,
1994 ieee80211_hwmp_net_diameter_traversaltime * 2,
1995 hwmp_rediscover_cb, rt);
1996 }
1997 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
1998 ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
1999 } else {
2000 ni = ieee80211_find_txnode(vap, dest);
2001 /* NB: if null then we leak mbuf */
2002 KASSERT(ni != NULL, ("leak mcast frame"));
2003 return ni;
2004 }
2005 done:
2006 if (ni == NULL && m != NULL) {
2007 if (sendpreq) {
2008 struct ieee80211com *ic = vap->iv_ic;
2009 /*
2010 * Queue packet for transmit when path discovery
2011 * completes. If discovery never completes the
2012 * frame will be flushed by way of the aging timer.
2013 */
2014 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
2015 "%s", "queue frame until path found");
2016 m->m_pkthdr.rcvif = (void *)(uintptr_t)
2017 ieee80211_mac_hash(ic, dest);
2018 /* XXX age chosen randomly */
2019 ieee80211_ageq_append(&ic->ic_stageq, m,
2020 IEEE80211_INACT_WAIT);
2021 } else {
2022 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
2023 dest, NULL, "%s", "no valid path to this node");
2024 m_freem(m);
2025 }
2026 }
2027 return ni;
2028 }
2029 #undef PREQ_TFLAGS
2030 #undef PREQ_TADDR
2031 #undef PREQ_TSEQ
2032
2033 static int
2034 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2035 {
2036 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2037 int error;
2038
2039 if (vap->iv_opmode != IEEE80211_M_MBSS)
2040 return ENOSYS;
2041 error = 0;
2042 switch (ireq->i_type) {
2043 case IEEE80211_IOC_HWMP_ROOTMODE:
2044 ireq->i_val = hs->hs_rootmode;
2045 break;
2046 case IEEE80211_IOC_HWMP_MAXHOPS:
2047 ireq->i_val = hs->hs_maxhops;
2048 break;
2049 default:
2050 return ENOSYS;
2051 }
2052 return error;
2053 }
2054 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
2055
2056 static int
2057 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2058 {
2059 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2060 int error;
2061
2062 if (vap->iv_opmode != IEEE80211_M_MBSS)
2063 return ENOSYS;
2064 error = 0;
2065 switch (ireq->i_type) {
2066 case IEEE80211_IOC_HWMP_ROOTMODE:
2067 if (ireq->i_val < 0 || ireq->i_val > 3)
2068 return EINVAL;
2069 hs->hs_rootmode = ireq->i_val;
2070 hwmp_rootmode_setup(vap);
2071 break;
2072 case IEEE80211_IOC_HWMP_MAXHOPS:
2073 if (ireq->i_val <= 0 || ireq->i_val > 255)
2074 return EINVAL;
2075 hs->hs_maxhops = ireq->i_val;
2076 break;
2077 default:
2078 return ENOSYS;
2079 }
2080 return error;
2081 }
2082 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);
Cache object: 31eff46caada0c5b9dcde8d8e1fe3fd0
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