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usr.sbin/makefs/ffs: Remove m_buf::b_is_hammer2
[dragonfly.git] / sys / netproto / 802_11 / wlan / ieee80211_hwmp.c
blob0b78370b12e3dba828f2e25bb9a3c3a2b89f2cd1
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_var.h>
57 #include <net/if_media.h>
58 #include <net/if_llc.h>
59 #include <net/ethernet.h>
60
61 #include <net/bpf.h>
62
63 #include <netproto/802_11/ieee80211_var.h>
64 #include <netproto/802_11/ieee80211_action.h>
65 #include <netproto/802_11/ieee80211_input.h>
66 #include <netproto/802_11/ieee80211_mesh.h>
67
68 static void hwmp_vattach(struct ieee80211vap *);
69 static void hwmp_vdetach(struct ieee80211vap *);
70 static int hwmp_newstate(struct ieee80211vap *,
71 enum ieee80211_state, int);
72 static int hwmp_send_action(struct ieee80211vap *,
73 const uint8_t [IEEE80211_ADDR_LEN],
74 uint8_t *, size_t);
75 static uint8_t * hwmp_add_meshpreq(uint8_t *,
76 const struct ieee80211_meshpreq_ie *);
77 static uint8_t * hwmp_add_meshprep(uint8_t *,
78 const struct ieee80211_meshprep_ie *);
79 static uint8_t * hwmp_add_meshperr(uint8_t *,
80 const struct ieee80211_meshperr_ie *);
81 static uint8_t * hwmp_add_meshrann(uint8_t *,
82 const struct ieee80211_meshrann_ie *);
83 static void hwmp_rootmode_setup(struct ieee80211vap *);
84 static void hwmp_rootmode_cb(void *);
85 static void hwmp_rootmode_rann_cb(void *);
86 static void hwmp_recv_preq(struct ieee80211vap *, struct ieee80211_node *,
87 const struct ieee80211_frame *,
88 const struct ieee80211_meshpreq_ie *);
89 static int hwmp_send_preq(struct ieee80211vap *,
90 const uint8_t [IEEE80211_ADDR_LEN],
91 struct ieee80211_meshpreq_ie *,
92 struct timeval *, struct timeval *);
93 static void hwmp_recv_prep(struct ieee80211vap *, struct ieee80211_node *,
94 const struct ieee80211_frame *,
95 const struct ieee80211_meshprep_ie *);
96 static int hwmp_send_prep(struct ieee80211vap *,
97 const uint8_t [IEEE80211_ADDR_LEN],
98 struct ieee80211_meshprep_ie *);
99 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
100 const struct ieee80211_frame *,
101 const struct ieee80211_meshperr_ie *);
102 static int hwmp_send_perr(struct ieee80211vap *,
103 const uint8_t [IEEE80211_ADDR_LEN],
104 struct ieee80211_meshperr_ie *);
105 static void hwmp_senderror(struct ieee80211vap *,
106 const uint8_t [IEEE80211_ADDR_LEN],
107 struct ieee80211_mesh_route *, int);
108 static void hwmp_recv_rann(struct ieee80211vap *, struct ieee80211_node *,
109 const struct ieee80211_frame *,
110 const struct ieee80211_meshrann_ie *);
111 static int hwmp_send_rann(struct ieee80211vap *,
112 const uint8_t [IEEE80211_ADDR_LEN],
113 struct ieee80211_meshrann_ie *);
114 static struct ieee80211_node *
115 hwmp_discover(struct ieee80211vap *,
116 const uint8_t [IEEE80211_ADDR_LEN], struct mbuf *);
117 static void hwmp_peerdown(struct ieee80211_node *);
118
119 static struct timeval ieee80211_hwmp_preqminint = { 0, 100000 };
120 static struct timeval ieee80211_hwmp_perrminint = { 0, 100000 };
121
122
123 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
124 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] =
125 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
126
127 typedef uint32_t ieee80211_hwmp_seq;
128 #define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0)
129 #define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0)
130 #define HWMP_SEQ_EQ(a, b) ((int32_t)((a)-(b)) == 0)
131 #define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0)
132 #define HWMP_SEQ_GEQ(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 travelse 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 #if defined(__DragonFly__)
261 hs = kmalloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
262 M_INTWAIT | M_ZERO);
263 #else
264 hs = IEEE80211_MALLOC(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
265 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
266 #endif
267 if (hs == NULL) {
268 kprintf("%s: couldn't alloc HWMP state\n", __func__);
269 return;
270 }
271 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
272 #if defined(__DragonFly__)
273 callout_init_mp(&hs->hs_roottimer);
274 #else
275 callout_init(&hs->hs_roottimer, 1);
276 #endif
277 vap->iv_hwmp = hs;
278 }
279
280 static void
281 hwmp_vdetach(struct ieee80211vap *vap)
282 {
283 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
284
285 callout_drain(&hs->hs_roottimer);
286 IEEE80211_FREE(vap->iv_hwmp, M_80211_VAP);
287 vap->iv_hwmp = NULL;
288 }
289
290 static int
291 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
292 {
293 enum ieee80211_state nstate = vap->iv_state;
294 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
295
296 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
297 __func__, ieee80211_state_name[ostate],
298 ieee80211_state_name[nstate], arg);
299
300 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
301 callout_drain(&hs->hs_roottimer);
302 if (nstate == IEEE80211_S_RUN)
303 hwmp_rootmode_setup(vap);
304 return 0;
305 }
306
307 /*
308 * Verify the length of an HWMP PREQ and return the number
309 * of destinations >= 1, if verification fails -1 is returned.
310 */
311 static int
312 verify_mesh_preq_len(struct ieee80211vap *vap,
313 const struct ieee80211_frame *wh, const uint8_t *iefrm)
314 {
315 int alloc_sz = -1;
316 int ndest = -1;
317 if (iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE) {
318 /* Originator External Address present */
319 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ_AE;
320 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET_AE];
321 } else {
322 /* w/o Originator External Address */
323 alloc_sz = IEEE80211_MESHPREQ_BASE_SZ;
324 ndest = iefrm[IEEE80211_MESHPREQ_TCNT_OFFSET];
325 }
326 alloc_sz += ndest * IEEE80211_MESHPREQ_TRGT_SZ;
327
328 if(iefrm[1] != (alloc_sz)) {
329 IEEE80211_DISCARD(vap,
330 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
331 wh, NULL, "PREQ (AE=%s) with wrong len",
332 iefrm[2] & IEEE80211_MESHPREQ_FLAGS_AE ? "1" : "0");
333 return (-1);
334 }
335 return ndest;
336 }
337
338 /*
339 * Verify the length of an HWMP PREP and returns 1 on success,
340 * otherwise -1.
341 */
342 static int
343 verify_mesh_prep_len(struct ieee80211vap *vap,
344 const struct ieee80211_frame *wh, const uint8_t *iefrm)
345 {
346 int alloc_sz = -1;
347 if (iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE) {
348 if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ_AE)
349 alloc_sz = IEEE80211_MESHPREP_BASE_SZ_AE;
350 } else if (iefrm[1] == IEEE80211_MESHPREP_BASE_SZ)
351 alloc_sz = IEEE80211_MESHPREP_BASE_SZ;
352 if(alloc_sz < 0) {
353 IEEE80211_DISCARD(vap,
354 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
355 wh, NULL, "PREP (AE=%s) with wrong len",
356 iefrm[2] & IEEE80211_MESHPREP_FLAGS_AE ? "1" : "0");
357 return (-1);
358 }
359 return (1);
360 }
361
362 /*
363 * Verify the length of an HWMP PERR and return the number
364 * of destinations >= 1, if verification fails -1 is returned.
365 */
366 static int
367 verify_mesh_perr_len(struct ieee80211vap *vap,
368 const struct ieee80211_frame *wh, const uint8_t *iefrm)
369 {
370 int alloc_sz = -1;
371 const uint8_t *iefrm_t = iefrm;
372 uint8_t ndest = iefrm_t[IEEE80211_MESHPERR_NDEST_OFFSET];
373 int i;
374
375 if(ndest > IEEE80211_MESHPERR_MAXDEST) {
376 IEEE80211_DISCARD(vap,
377 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
378 wh, NULL, "PERR with wrong number of destionat (>19), %u",
379 ndest);
380 return (-1);
381 }
382
383 iefrm_t += IEEE80211_MESHPERR_NDEST_OFFSET + 1; /* flag is next field */
384 /* We need to check each destionation flag to know size */
385 for(i = 0; i<ndest; i++) {
386 if ((*iefrm_t) & IEEE80211_MESHPERR_FLAGS_AE)
387 iefrm_t += IEEE80211_MESHPERR_DEST_SZ_AE;
388 else
389 iefrm_t += IEEE80211_MESHPERR_DEST_SZ;
390 }
391
392 alloc_sz = (iefrm_t - iefrm) - 2; /* action + code */
393 if(alloc_sz != iefrm[1]) {
394 IEEE80211_DISCARD(vap,
395 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
396 wh, NULL, "%s", "PERR with wrong len");
397 return (-1);
398 }
399 return ndest;
400 }
401
402 static int
403 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
404 const struct ieee80211_frame *wh,
405 const uint8_t *frm, const uint8_t *efrm)
406 {
407 struct ieee80211vap *vap = ni->ni_vap;
408 struct ieee80211_meshpreq_ie *preq;
409 struct ieee80211_meshprep_ie *prep;
410 struct ieee80211_meshperr_ie *perr;
411 struct ieee80211_meshrann_ie rann;
412 const uint8_t *iefrm = frm + 2; /* action + code */
413 const uint8_t *iefrm_t = iefrm; /* temporary pointer */
414 int ndest = -1;
415 int found = 0;
416
417 while (efrm - iefrm > 1) {
418 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
419 switch (*iefrm) {
420 case IEEE80211_ELEMID_MESHPREQ:
421 {
422 int i = 0;
423
424 iefrm_t = iefrm;
425 ndest = verify_mesh_preq_len(vap, wh, iefrm_t);
426 if (ndest < 0) {
427 vap->iv_stats.is_rx_mgtdiscard++;
428 break;
429 }
430 #if defined(__DragonFly__)
431 preq = kmalloc(sizeof(*preq) +
432 (ndest - 1) * sizeof(*preq->preq_targets),
433 M_80211_MESH_PREQ, M_INTWAIT | M_ZERO);
434 #else
435 preq = IEEE80211_MALLOC(sizeof(*preq) +
436 (ndest - 1) * sizeof(*preq->preq_targets),
437 M_80211_MESH_PREQ,
438 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
439 #endif
440 KASSERT(preq != NULL, ("preq == NULL"));
441
442 preq->preq_ie = *iefrm_t++;
443 preq->preq_len = *iefrm_t++;
444 preq->preq_flags = *iefrm_t++;
445 preq->preq_hopcount = *iefrm_t++;
446 preq->preq_ttl = *iefrm_t++;
447 preq->preq_id = le32dec(iefrm_t); iefrm_t += 4;
448 IEEE80211_ADDR_COPY(preq->preq_origaddr, iefrm_t);
449 iefrm_t += 6;
450 preq->preq_origseq = le32dec(iefrm_t); iefrm_t += 4;
451 /* NB: may have Originator Proxied Address */
452 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
453 IEEE80211_ADDR_COPY(
454 preq->preq_orig_ext_addr, iefrm_t);
455 iefrm_t += 6;
456 }
457 preq->preq_lifetime = le32dec(iefrm_t); iefrm_t += 4;
458 preq->preq_metric = le32dec(iefrm_t); iefrm_t += 4;
459 preq->preq_tcount = *iefrm_t++;
460
461 for (i = 0; i < preq->preq_tcount; i++) {
462 preq->preq_targets[i].target_flags = *iefrm_t++;
463 IEEE80211_ADDR_COPY(
464 preq->preq_targets[i].target_addr, iefrm_t);
465 iefrm_t += 6;
466 preq->preq_targets[i].target_seq =
467 le32dec(iefrm_t);
468 iefrm_t += 4;
469 }
470
471 hwmp_recv_preq(vap, ni, wh, preq);
472 IEEE80211_FREE(preq, M_80211_MESH_PREQ);
473 found++;
474 break;
475 }
476 case IEEE80211_ELEMID_MESHPREP:
477 {
478 iefrm_t = iefrm;
479 ndest = verify_mesh_prep_len(vap, wh, iefrm_t);
480 if (ndest < 0) {
481 vap->iv_stats.is_rx_mgtdiscard++;
482 break;
483 }
484 #if defined(__DragonFly__)
485 prep = kmalloc(sizeof(*prep),
486 M_80211_MESH_PREP, M_INTWAIT | M_ZERO);
487 #else
488 prep = IEEE80211_MALLOC(sizeof(*prep),
489 M_80211_MESH_PREP,
490 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
491 #endif
492 KASSERT(prep != NULL, ("prep == NULL"));
493
494 prep->prep_ie = *iefrm_t++;
495 prep->prep_len = *iefrm_t++;
496 prep->prep_flags = *iefrm_t++;
497 prep->prep_hopcount = *iefrm_t++;
498 prep->prep_ttl = *iefrm_t++;
499 IEEE80211_ADDR_COPY(prep->prep_targetaddr, iefrm_t);
500 iefrm_t += 6;
501 prep->prep_targetseq = le32dec(iefrm_t); iefrm_t += 4;
502 /* NB: May have Target Proxied Address */
503 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
504 IEEE80211_ADDR_COPY(
505 prep->prep_target_ext_addr, iefrm_t);
506 iefrm_t += 6;
507 }
508 prep->prep_lifetime = le32dec(iefrm_t); iefrm_t += 4;
509 prep->prep_metric = le32dec(iefrm_t); iefrm_t += 4;
510 IEEE80211_ADDR_COPY(prep->prep_origaddr, iefrm_t);
511 iefrm_t += 6;
512 prep->prep_origseq = le32dec(iefrm_t); iefrm_t += 4;
513
514 hwmp_recv_prep(vap, ni, wh, prep);
515 IEEE80211_FREE(prep, M_80211_MESH_PREP);
516 found++;
517 break;
518 }
519 case IEEE80211_ELEMID_MESHPERR:
520 {
521 int i = 0;
522
523 iefrm_t = iefrm;
524 ndest = verify_mesh_perr_len(vap, wh, iefrm_t);
525 if (ndest < 0) {
526 vap->iv_stats.is_rx_mgtdiscard++;
527 break;
528 }
529 #if defined(__DragonFly__)
530 perr = kmalloc(sizeof(*perr) +
531 (ndest - 1) * sizeof(*perr->perr_dests),
532 M_80211_MESH_PERR, M_INTWAIT | M_ZERO);
533 #else
534 perr = IEEE80211_MALLOC(sizeof(*perr) +
535 (ndest - 1) * sizeof(*perr->perr_dests),
536 M_80211_MESH_PERR,
537 IEEE80211_M_NOWAIT | IEEE80211_M_ZERO);
538 #endif
539 KASSERT(perr != NULL, ("perr == NULL"));
540
541 perr->perr_ie = *iefrm_t++;
542 perr->perr_len = *iefrm_t++;
543 perr->perr_ttl = *iefrm_t++;
544 perr->perr_ndests = *iefrm_t++;
545
546 for (i = 0; i<perr->perr_ndests; i++) {
547 perr->perr_dests[i].dest_flags = *iefrm_t++;
548 IEEE80211_ADDR_COPY(
549 perr->perr_dests[i].dest_addr, iefrm_t);
550 iefrm_t += 6;
551 perr->perr_dests[i].dest_seq = le32dec(iefrm_t);
552 iefrm_t += 4;
553 /* NB: May have Target Proxied Address */
554 if (perr->perr_dests[i].dest_flags &
555 IEEE80211_MESHPERR_FLAGS_AE) {
556 IEEE80211_ADDR_COPY(
557 perr->perr_dests[i].dest_ext_addr,
558 iefrm_t);
559 iefrm_t += 6;
560 }
561 perr->perr_dests[i].dest_rcode =
562 le16dec(iefrm_t);
563 iefrm_t += 2;
564 }
565
566 hwmp_recv_perr(vap, ni, wh, perr);
567 IEEE80211_FREE(perr, M_80211_MESH_PERR);
568 found++;
569 break;
570 }
571 case IEEE80211_ELEMID_MESHRANN:
572 {
573 const struct ieee80211_meshrann_ie *mrann =
574 (const struct ieee80211_meshrann_ie *) iefrm;
575 if (mrann->rann_len !=
576 sizeof(struct ieee80211_meshrann_ie) - 2) {
577 IEEE80211_DISCARD(vap,
578 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
579 wh, NULL, "%s", "RAN with wrong len");
580 vap->iv_stats.is_rx_mgtdiscard++;
581 return 1;
582 }
583 memcpy(&rann, mrann, sizeof(rann));
584 rann.rann_seq = le32dec(&mrann->rann_seq);
585 rann.rann_interval = le32dec(&mrann->rann_interval);
586 rann.rann_metric = le32dec(&mrann->rann_metric);
587 hwmp_recv_rann(vap, ni, wh, &rann);
588 found++;
589 break;
590 }
591 }
592 iefrm += iefrm[1] + 2;
593 }
594 if (!found) {
595 IEEE80211_DISCARD(vap,
596 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
597 wh, NULL, "%s", "PATH SEL action without IE");
598 vap->iv_stats.is_rx_mgtdiscard++;
599 }
600 return 0;
601 }
602
603 static int
604 hwmp_send_action(struct ieee80211vap *vap,
605 const uint8_t da[IEEE80211_ADDR_LEN],
606 uint8_t *ie, size_t len)
607 {
608 struct ieee80211_node *ni;
609 struct ieee80211com *ic;
610 struct ieee80211_bpf_params params;
611 struct mbuf *m;
612 uint8_t *frm;
613 int ret;
614
615 if (IEEE80211_IS_MULTICAST(da)) {
616 ni = ieee80211_ref_node(vap->iv_bss);
617 #ifdef IEEE80211_DEBUG_REFCNT
618 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
619 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
620 __func__, __LINE__,
621 ni, ether_sprintf(ni->ni_macaddr),
622 ieee80211_node_refcnt(ni)+1);
623 #endif
624 ieee80211_ref_node(ni);
625 }
626 else
627 ni = ieee80211_mesh_find_txnode(vap, da);
628
629 if (vap->iv_state == IEEE80211_S_CAC) {
630 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
631 "block %s frame in CAC state", "HWMP action");
632 vap->iv_stats.is_tx_badstate++;
633 return EIO; /* XXX */
634 }
635
636 KASSERT(ni != NULL, ("null node"));
637 ic = ni->ni_ic;
638
639 m = ieee80211_getmgtframe(&frm,
640 ic->ic_headroom + sizeof(struct ieee80211_frame),
641 sizeof(struct ieee80211_action) + len
642 );
643 if (m == NULL) {
644 ieee80211_free_node(ni);
645 vap->iv_stats.is_tx_nobuf++;
646 return ENOMEM;
647 }
648 *frm++ = IEEE80211_ACTION_CAT_MESH;
649 *frm++ = IEEE80211_ACTION_MESH_HWMP;
650 switch (*ie) {
651 case IEEE80211_ELEMID_MESHPREQ:
652 frm = hwmp_add_meshpreq(frm,
653 (struct ieee80211_meshpreq_ie *)ie);
654 break;
655 case IEEE80211_ELEMID_MESHPREP:
656 frm = hwmp_add_meshprep(frm,
657 (struct ieee80211_meshprep_ie *)ie);
658 break;
659 case IEEE80211_ELEMID_MESHPERR:
660 frm = hwmp_add_meshperr(frm,
661 (struct ieee80211_meshperr_ie *)ie);
662 break;
663 case IEEE80211_ELEMID_MESHRANN:
664 frm = hwmp_add_meshrann(frm,
665 (struct ieee80211_meshrann_ie *)ie);
666 break;
667 }
668
669 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
670 M_PREPEND(m, sizeof(struct ieee80211_frame), M_NOWAIT);
671 if (m == NULL) {
672 ieee80211_free_node(ni);
673 vap->iv_stats.is_tx_nobuf++;
674 return ENOMEM;
675 }
676
677 IEEE80211_TX_LOCK(ic);
678
679 ieee80211_send_setup(ni, m,
680 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
681 IEEE80211_NONQOS_TID, vap->iv_myaddr, da, vap->iv_myaddr);
682
683 m->m_flags |= M_ENCAP; /* mark encapsulated */
684 IEEE80211_NODE_STAT(ni, tx_mgmt);
685
686 memset(&params, 0, sizeof(params));
687 params.ibp_pri = WME_AC_VO;
688 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
689 if (IEEE80211_IS_MULTICAST(da))
690 params.ibp_try0 = 1;
691 else
692 params.ibp_try0 = ni->ni_txparms->maxretry;
693 params.ibp_power = ni->ni_txpower;
694 ret = ieee80211_raw_output(vap, ni, m, &params);
695 IEEE80211_TX_UNLOCK(ic);
696 return (ret);
697 }
698
699 #define ADDSHORT(frm, v) do { \
700 le16enc(frm, v); \
701 frm += 2; \
702 } while (0)
703 #define ADDWORD(frm, v) do { \
704 le32enc(frm, v); \
705 frm += 4; \
706 } while (0)
707 /*
708 * Add a Mesh Path Request IE to a frame.
709 */
710 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
711 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
712 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
713 static uint8_t *
714 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
715 {
716 int i;
717
718 *frm++ = IEEE80211_ELEMID_MESHPREQ;
719 *frm++ = preq->preq_len; /* len already calculated */
720 *frm++ = preq->preq_flags;
721 *frm++ = preq->preq_hopcount;
722 *frm++ = preq->preq_ttl;
723 ADDWORD(frm, preq->preq_id);
724 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
725 ADDWORD(frm, preq->preq_origseq);
726 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
727 IEEE80211_ADDR_COPY(frm, preq->preq_orig_ext_addr);
728 frm += 6;
729 }
730 ADDWORD(frm, preq->preq_lifetime);
731 ADDWORD(frm, preq->preq_metric);
732 *frm++ = preq->preq_tcount;
733 for (i = 0; i < preq->preq_tcount; i++) {
734 *frm++ = PREQ_TFLAGS(i);
735 IEEE80211_ADDR_COPY(frm, PREQ_TADDR(i));
736 frm += 6;
737 ADDWORD(frm, PREQ_TSEQ(i));
738 }
739 return frm;
740 }
741 #undef PREQ_TFLAGS
742 #undef PREQ_TADDR
743 #undef PREQ_TSEQ
744
745 /*
746 * Add a Mesh Path Reply IE to a frame.
747 */
748 static uint8_t *
749 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
750 {
751 *frm++ = IEEE80211_ELEMID_MESHPREP;
752 *frm++ = prep->prep_len; /* len already calculated */
753 *frm++ = prep->prep_flags;
754 *frm++ = prep->prep_hopcount;
755 *frm++ = prep->prep_ttl;
756 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
757 ADDWORD(frm, prep->prep_targetseq);
758 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
759 IEEE80211_ADDR_COPY(frm, prep->prep_target_ext_addr);
760 frm += 6;
761 }
762 ADDWORD(frm, prep->prep_lifetime);
763 ADDWORD(frm, prep->prep_metric);
764 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
765 ADDWORD(frm, prep->prep_origseq);
766 return frm;
767 }
768
769 /*
770 * Add a Mesh Path Error IE to a frame.
771 */
772 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
773 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
774 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
775 #define PERR_EXTADDR(n) perr->perr_dests[n].dest_ext_addr
776 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode
777 static uint8_t *
778 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
779 {
780 int i;
781
782 *frm++ = IEEE80211_ELEMID_MESHPERR;
783 *frm++ = perr->perr_len; /* len already calculated */
784 *frm++ = perr->perr_ttl;
785 *frm++ = perr->perr_ndests;
786 for (i = 0; i < perr->perr_ndests; i++) {
787 *frm++ = PERR_DFLAGS(i);
788 IEEE80211_ADDR_COPY(frm, PERR_DADDR(i));
789 frm += 6;
790 ADDWORD(frm, PERR_DSEQ(i));
791 if (PERR_DFLAGS(i) & IEEE80211_MESHPERR_FLAGS_AE) {
792 IEEE80211_ADDR_COPY(frm, PERR_EXTADDR(i));
793 frm += 6;
794 }
795 ADDSHORT(frm, PERR_DRCODE(i));
796 }
797 return frm;
798 }
799 #undef PERR_DFLAGS
800 #undef PERR_DADDR
801 #undef PERR_DSEQ
802 #undef PERR_EXTADDR
803 #undef PERR_DRCODE
804
805 /*
806 * Add a Root Annoucement IE to a frame.
807 */
808 static uint8_t *
809 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
810 {
811 *frm++ = IEEE80211_ELEMID_MESHRANN;
812 *frm++ = rann->rann_len;
813 *frm++ = rann->rann_flags;
814 *frm++ = rann->rann_hopcount;
815 *frm++ = rann->rann_ttl;
816 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
817 ADDWORD(frm, rann->rann_seq);
818 ADDWORD(frm, rann->rann_interval);
819 ADDWORD(frm, rann->rann_metric);
820 return frm;
821 }
822
823 static void
824 hwmp_rootmode_setup(struct ieee80211vap *vap)
825 {
826 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
827 struct ieee80211_mesh_state *ms = vap->iv_mesh;
828
829 switch (hs->hs_rootmode) {
830 case IEEE80211_HWMP_ROOTMODE_DISABLED:
831 callout_drain(&hs->hs_roottimer);
832 ms->ms_flags &= ~IEEE80211_MESHFLAGS_ROOT;
833 break;
834 case IEEE80211_HWMP_ROOTMODE_NORMAL:
835 case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
836 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
837 hwmp_rootmode_cb, vap);
838 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
839 break;
840 case IEEE80211_HWMP_ROOTMODE_RANN:
841 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
842 hwmp_rootmode_rann_cb, vap);
843 ms->ms_flags |= IEEE80211_MESHFLAGS_ROOT;
844 break;
845 }
846 }
847
848 /*
849 * Send a broadcast Path Request to find all nodes on the mesh. We are
850 * called when the vap is configured as a HWMP root node.
851 */
852 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
853 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
854 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
855 static void
856 hwmp_rootmode_cb(void *arg)
857 {
858 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
859 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
860 struct ieee80211_mesh_state *ms = vap->iv_mesh;
861 struct ieee80211_meshpreq_ie preq;
862
863 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
864 "%s", "send broadcast PREQ");
865
866 preq.preq_flags = 0;
867 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
868 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_GATE;
869 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
870 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
871 preq.preq_hopcount = 0;
872 preq.preq_ttl = ms->ms_ttl;
873 preq.preq_id = ++hs->hs_preqid;
874 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
875 preq.preq_origseq = ++hs->hs_seq;
876 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
877 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
878 preq.preq_tcount = 1;
879 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
880 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
881 IEEE80211_MESHPREQ_TFLAGS_USN;
882 PREQ_TSEQ(0) = 0;
883 vap->iv_stats.is_hwmp_rootreqs++;
884 /* NB: we enforce rate check ourself */
885 hwmp_send_preq(vap, broadcastaddr, &preq, NULL, NULL);
886 hwmp_rootmode_setup(vap);
887 }
888 #undef PREQ_TFLAGS
889 #undef PREQ_TADDR
890 #undef PREQ_TSEQ
891
892 /*
893 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
894 * called when the vap is configured as a HWMP RANN root node.
895 */
896 static void
897 hwmp_rootmode_rann_cb(void *arg)
898 {
899 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
900 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
901 struct ieee80211_mesh_state *ms = vap->iv_mesh;
902 struct ieee80211_meshrann_ie rann;
903
904 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
905 "%s", "send broadcast RANN");
906
907 rann.rann_flags = 0;
908 if (ms->ms_flags & IEEE80211_MESHFLAGS_GATE)
909 rann.rann_flags |= IEEE80211_MESHFLAGS_GATE;
910 rann.rann_hopcount = 0;
911 rann.rann_ttl = ms->ms_ttl;
912 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
913 rann.rann_seq = ++hs->hs_seq;
914 rann.rann_interval = ieee80211_hwmp_rannint;
915 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
916
917 vap->iv_stats.is_hwmp_rootrann++;
918 hwmp_send_rann(vap, broadcastaddr, &rann);
919 hwmp_rootmode_setup(vap);
920 }
921
922 /*
923 * Update forwarding information to TA if metric improves.
924 */
925 static void
926 hwmp_update_transmitter(struct ieee80211vap *vap, struct ieee80211_node *ni,
927 const char *hwmp_frame)
928 {
929 struct ieee80211_mesh_state *ms = vap->iv_mesh;
930 struct ieee80211_mesh_route *rttran = NULL; /* Transmitter */
931 int metric = 0;
932
933 rttran = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
934 if (rttran == NULL) {
935 rttran = ieee80211_mesh_rt_add(vap, ni->ni_macaddr);
936 if (rttran == NULL) {
937 #if defined(__DragonFly__)
938 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
939 "unable to add path to transmitter %s of %s",
940 ether_sprintf(ni->ni_macaddr), hwmp_frame);
941 #else
942 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
943 "unable to add path to transmitter %6D of %s",
944 ni->ni_macaddr, ":", hwmp_frame);
945 #endif
946 vap->iv_stats.is_mesh_rtaddfailed++;
947 return;
948 }
949 }
950 metric = ms->ms_pmetric->mpm_metric(ni);
951 if (!(rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) ||
952 rttran->rt_metric > metric)
953 {
954 #if defined(__DragonFly__)
955 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
956 "%s path to transmitter %s of %s, metric %d:%d",
957 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
958 "prefer" : "update", ether_sprintf(ni->ni_macaddr),
959 hwmp_frame,
960 rttran->rt_metric, metric);
961 #else
962 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
963 "%s path to transmiter %6D of %s, metric %d:%d",
964 rttran->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
965 "prefer" : "update", ni->ni_macaddr, ":", hwmp_frame,
966 rttran->rt_metric, metric);
967 #endif
968 IEEE80211_ADDR_COPY(rttran->rt_nexthop, ni->ni_macaddr);
969 rttran->rt_metric = metric;
970 rttran->rt_nhops = 1;
971 ieee80211_mesh_rt_update(rttran, ms->ms_ppath->mpp_inact);
972 rttran->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
973 }
974 }
975
976 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
977 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
978 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
979 static void
980 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
981 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
982 {
983 struct ieee80211_mesh_state *ms = vap->iv_mesh;
984 struct ieee80211_mesh_route *rtorig = NULL;
985 struct ieee80211_mesh_route *rtorig_ext = NULL;
986 struct ieee80211_mesh_route *rttarg = NULL;
987 struct ieee80211_hwmp_route *hrorig = NULL;
988 struct ieee80211_hwmp_route *hrtarg = NULL;
989 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
990 struct ieee80211_meshprep_ie prep;
991 ieee80211_hwmp_seq preqid; /* last seen preqid for orig */
992 uint32_t metric = 0;
993
994 /*
995 * Ignore PREQs from us. Could happen because someone forward it
996 * back to us.
997 */
998 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
999 return;
1000
1001 #if defined(__DragonFly__)
1002 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1003 "received PREQ, orig %s, targ(0) %s",
1004 ether_sprintf(preq->preq_origaddr),
1005 ether_sprintf(PREQ_TADDR(0)));
1006 #else
1007 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1008 "received PREQ, orig %6D, targ(0) %6D", preq->preq_origaddr, ":",
1009 PREQ_TADDR(0), ":");
1010 #endif
1011
1012 /*
1013 * Acceptance criteria: (if the PREQ is not for us or not broadcast,
1014 * or an external mac address not proxied by us),
1015 * AND forwarding is disabled, discard this PREQ.
1016 */
1017 rttarg = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
1018 if (!(ms->ms_flags & IEEE80211_MESHFLAGS_FWD) &&
1019 (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
1020 !IEEE80211_IS_MULTICAST(PREQ_TADDR(0)) ||
1021 (rttarg != NULL &&
1022 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
1023 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate)))) {
1024 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
1025 preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
1026 return;
1027 }
1028 /*
1029 * Acceptance criteria: if unicast addressed
1030 * AND no valid forwarding for Target of PREQ, discard this PREQ.
1031 */
1032 if(rttarg != NULL)
1033 hrtarg = IEEE80211_MESH_ROUTE_PRIV(rttarg,
1034 struct ieee80211_hwmp_route);
1035 /* Address mode: ucast */
1036 if(preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AM &&
1037 rttarg == NULL &&
1038 !IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
1039 #if defined(__DragonFly__)
1040 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
1041 preq->preq_origaddr, NULL,
1042 "unicast addressed PREQ of unknown target %s",
1043 ether_sprintf(PREQ_TADDR(0)));
1044 #else
1045 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
1046 preq->preq_origaddr, NULL,
1047 "unicast addressed PREQ of unknown target %6D",
1048 PREQ_TADDR(0), ":");
1049 #endif
1050 return;
1051 }
1052
1053 /* PREQ ACCEPTED */
1054
1055 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
1056 if (rtorig == NULL) {
1057 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
1058 if (rtorig == NULL) {
1059 #if defined(__DragonFly__)
1060 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1061 "unable to add orig path to %s",
1062 ether_sprintf(preq->preq_origaddr));
1063 #else
1064 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1065 "unable to add orig path to %6D",
1066 preq->preq_origaddr, ":");
1067 #endif
1068 vap->iv_stats.is_mesh_rtaddfailed++;
1069 return;
1070 }
1071 #if defined(__DragonFly__)
1072 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1073 "adding originator %s",
1074 ether_sprintf(preq->preq_origaddr));
1075 #else
1076 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1077 "adding originator %6D", preq->preq_origaddr, ":");
1078 #endif
1079 }
1080 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
1081
1082 /* record last seen preqid */
1083 preqid = hrorig->hr_preqid;
1084 hrorig->hr_preqid = HWMP_SEQ_MAX(hrorig->hr_preqid, preq->preq_id);
1085
1086 /* Data creation and update of forwarding information
1087 * according to Table 11C-8 for originator mesh STA.
1088 */
1089 metric = preq->preq_metric + ms->ms_pmetric->mpm_metric(ni);
1090 if (HWMP_SEQ_GT(preq->preq_origseq, hrorig->hr_seq) ||
1091 (HWMP_SEQ_EQ(preq->preq_origseq, hrorig->hr_seq) &&
1092 metric < rtorig->rt_metric)) {
1093 hrorig->hr_seq = preq->preq_origseq;
1094 IEEE80211_ADDR_COPY(rtorig->rt_nexthop, wh->i_addr2);
1095 rtorig->rt_metric = metric;
1096 rtorig->rt_nhops = preq->preq_hopcount + 1;
1097 ieee80211_mesh_rt_update(rtorig, preq->preq_lifetime);
1098 /* Path to orig is valid now.
1099 * NB: we know it can't be Proxy, and if it is GATE
1100 * it will be marked below.
1101 */
1102 rtorig->rt_flags = IEEE80211_MESHRT_FLAGS_VALID;
1103 } else if ((hrtarg != NULL &&
1104 !HWMP_SEQ_EQ(hrtarg->hr_seq, PREQ_TSEQ(0))) ||
1105 (rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1106 preqid >= preq->preq_id)) {
1107 #if defined(__DragonFly__)
1108 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1109 "discard PREQ from %s, old seqno %u <= %u,"
1110 " or old preqid %u < %u",
1111 ether_sprintf(preq->preq_origaddr),
1112 preq->preq_origseq, hrorig->hr_seq,
1113 preq->preq_id, preqid);
1114 #else
1115 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1116 "discard PREQ from %6D, old seqno %u <= %u,"
1117 " or old preqid %u < %u",
1118 preq->preq_origaddr, ":",
1119 preq->preq_origseq, hrorig->hr_seq,
1120 preq->preq_id, preqid);
1121 #endif
1122 return;
1123 }
1124
1125 /* Update forwarding information to TA if metric improves. */
1126 hwmp_update_transmitter(vap, ni, "PREQ");
1127
1128 /*
1129 * Check if the PREQ is addressed to us.
1130 * or a Proxy currently gated by us.
1131 */
1132 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) ||
1133 (ms->ms_flags & IEEE80211_MESHFLAGS_GATE &&
1134 rttarg != NULL &&
1135 IEEE80211_ADDR_EQ(vap->iv_myaddr, rttarg->rt_mesh_gate) &&
1136 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY &&
1137 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1138 /*
1139 * When we are the target we shall update our own HWMP seq
1140 * number with max of (current and preq->seq) + 1
1141 */
1142 hs->hs_seq = HWMP_SEQ_MAX(hs->hs_seq, PREQ_TSEQ(0)) + 1;
1143
1144 prep.prep_flags = 0;
1145 prep.prep_hopcount = 0;
1146 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1147 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
1148 if (rttarg != NULL && /* if NULL it means we are the target */
1149 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1150 #if defined(__DragonFly__)
1151 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1152 "reply for proxy %s",
1153 ether_sprintf(rttarg->rt_dest));
1154 #else
1155 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1156 "reply for proxy %6D", rttarg->rt_dest, ":");
1157 #endif
1158 prep.prep_flags |= IEEE80211_MESHPREP_FLAGS_AE;
1159 IEEE80211_ADDR_COPY(prep.prep_target_ext_addr,
1160 rttarg->rt_dest);
1161 /* update proxy seqno to HWMP seqno */
1162 rttarg->rt_ext_seq = hs->hs_seq;
1163 prep.prep_hopcount = rttarg->rt_nhops;
1164 prep.prep_metric = rttarg->rt_metric;
1165 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rttarg->rt_mesh_gate);
1166 }
1167 /*
1168 * Build and send a PREP frame.
1169 */
1170 prep.prep_ttl = ms->ms_ttl;
1171 prep.prep_targetseq = hs->hs_seq;
1172 prep.prep_lifetime = preq->preq_lifetime;
1173 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
1174 prep.prep_origseq = preq->preq_origseq;
1175
1176 #if defined(__DragonFly__)
1177 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1178 "reply to %s", ether_sprintf(preq->preq_origaddr));
1179 #else
1180 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1181 "reply to %6D", preq->preq_origaddr, ":");
1182 #endif
1183 hwmp_send_prep(vap, wh->i_addr2, &prep);
1184 return;
1185 }
1186 /* we may update our proxy information for the orig external */
1187 else if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE) {
1188 rtorig_ext =
1189 ieee80211_mesh_rt_find(vap, preq->preq_orig_ext_addr);
1190 if (rtorig_ext == NULL) {
1191 rtorig_ext = ieee80211_mesh_rt_add(vap,
1192 preq->preq_orig_ext_addr);
1193 if (rtorig_ext == NULL) {
1194 #if defined(__DragonFly__)
1195 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1196 "unable to add orig ext proxy to %s",
1197 ether_sprintf(preq->preq_orig_ext_addr));
1198 #else
1199 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1200 "unable to add orig ext proxy to %6D",
1201 preq->preq_orig_ext_addr, ":");
1202 #endif
1203 vap->iv_stats.is_mesh_rtaddfailed++;
1204 return;
1205 }
1206 IEEE80211_ADDR_COPY(rtorig_ext->rt_mesh_gate,
1207 preq->preq_origaddr);
1208 }
1209 rtorig_ext->rt_ext_seq = preq->preq_origseq;
1210 ieee80211_mesh_rt_update(rtorig_ext, preq->preq_lifetime);
1211 }
1212 /*
1213 * Proactive PREQ: reply with a proactive PREP to the
1214 * root STA if requested.
1215 */
1216 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
1217 (PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
1218 #if defined(__DragonFly__)
1219 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1220 "root mesh station @ %s",
1221 ether_sprintf(preq->preq_origaddr));
1222 #else
1223 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1224 "root mesh station @ %6D", preq->preq_origaddr, ":");
1225 #endif
1226
1227 /* Check if root is a mesh gate, mark it */
1228 if (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_GATE) {
1229 struct ieee80211_mesh_gate_route *gr;
1230
1231 rtorig->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1232 gr = ieee80211_mesh_mark_gate(vap, preq->preq_origaddr,
1233 rtorig);
1234 gr->gr_lastseq = 0; /* NOT GANN */
1235 }
1236
1237 /*
1238 * Reply with a PREP if we don't have a path to the root
1239 * or if the root sent us a proactive PREQ.
1240 */
1241 if ((rtorig->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1242 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
1243 prep.prep_flags = 0;
1244 prep.prep_hopcount = 0;
1245 prep.prep_ttl = ms->ms_ttl;
1246 IEEE80211_ADDR_COPY(prep.prep_origaddr,
1247 preq->preq_origaddr);
1248 prep.prep_origseq = preq->preq_origseq;
1249 prep.prep_lifetime = preq->preq_lifetime;
1250 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1251 IEEE80211_ADDR_COPY(prep.prep_targetaddr,
1252 vap->iv_myaddr);
1253 prep.prep_targetseq = ++hs->hs_seq;
1254 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1255 }
1256 }
1257
1258 /*
1259 * Forwarding and Intermediate reply for PREQs with 1 target.
1260 */
1261 if ((preq->preq_tcount == 1) && (preq->preq_ttl > 1) &&
1262 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1263 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
1264
1265 memcpy(&ppreq, preq, sizeof(ppreq));
1266
1267 /*
1268 * We have a valid route to this node.
1269 * NB: if target is proxy dont reply.
1270 */
1271 if (rttarg != NULL &&
1272 rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
1273 !(rttarg->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)) {
1274 /*
1275 * Check if we can send an intermediate Path Reply,
1276 * i.e., Target Only bit is not set and target is not
1277 * the MAC broadcast address.
1278 */
1279 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO) &&
1280 !IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr)) {
1281 struct ieee80211_meshprep_ie prep;
1282
1283 #if defined(__DragonFly__)
1284 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1285 "intermediate reply for PREQ from %s",
1286 ether_sprintf(preq->preq_origaddr));
1287 #else
1288 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1289 "intermediate reply for PREQ from %6D",
1290 preq->preq_origaddr, ":");
1291 #endif
1292 prep.prep_flags = 0;
1293 prep.prep_hopcount = rttarg->rt_nhops;
1294 prep.prep_ttl = ms->ms_ttl;
1295 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
1296 PREQ_TADDR(0));
1297 prep.prep_targetseq = hrtarg->hr_seq;
1298 prep.prep_lifetime = preq->preq_lifetime;
1299 prep.prep_metric =rttarg->rt_metric;
1300 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
1301 preq->preq_origaddr);
1302 prep.prep_origseq = hrorig->hr_seq;
1303 hwmp_send_prep(vap, rtorig->rt_nexthop, &prep);
1304
1305 /*
1306 * Set TO and unset RF bits because we have
1307 * sent a PREP.
1308 */
1309 ppreq.preq_targets[0].target_flags |=
1310 IEEE80211_MESHPREQ_TFLAGS_TO;
1311 }
1312 }
1313
1314 #if defined(__DragonFly__)
1315 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1316 "forward PREQ from %s",
1317 ether_sprintf(preq->preq_origaddr));
1318 #else
1319 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1320 "forward PREQ from %6D",
1321 preq->preq_origaddr, ":");
1322 #endif
1323 ppreq.preq_hopcount += 1;
1324 ppreq.preq_ttl -= 1;
1325 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
1326
1327 /* don't do PREQ ratecheck when we propagate */
1328 hwmp_send_preq(vap, broadcastaddr, &ppreq, NULL, NULL);
1329 }
1330 }
1331 #undef PREQ_TFLAGS
1332 #undef PREQ_TADDR
1333 #undef PREQ_TSEQ
1334
1335 static int
1336 hwmp_send_preq(struct ieee80211vap *vap,
1337 const uint8_t da[IEEE80211_ADDR_LEN],
1338 struct ieee80211_meshpreq_ie *preq,
1339 struct timeval *last, struct timeval *minint)
1340 {
1341
1342 /*
1343 * Enforce PREQ interval.
1344 * NB: Proactive ROOT PREQs rate is handled by cb task.
1345 */
1346 if (last != NULL && minint != NULL) {
1347 if (ratecheck(last, minint) == 0)
1348 return EALREADY; /* XXX: we should postpone */
1349 getmicrouptime(last);
1350 }
1351
1352 /*
1353 * mesh preq action frame format
1354 * [6] da
1355 * [6] sa
1356 * [6] addr3 = sa
1357 * [1] action
1358 * [1] category
1359 * [tlv] mesh path request
1360 */
1361 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
1362 preq->preq_len = (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_AE ?
1363 IEEE80211_MESHPREQ_BASE_SZ_AE : IEEE80211_MESHPREQ_BASE_SZ) +
1364 preq->preq_tcount * IEEE80211_MESHPREQ_TRGT_SZ;
1365 return hwmp_send_action(vap, da, (uint8_t *)preq, preq->preq_len+2);
1366 }
1367
1368 static void
1369 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
1370 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
1371 {
1372 #define IS_PROXY(rt) (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY)
1373 #define PROXIED_BY_US(rt) \
1374 (IEEE80211_ADDR_EQ(vap->iv_myaddr, rt->rt_mesh_gate))
1375 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1376 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1377 struct ieee80211_mesh_route *rt = NULL;
1378 struct ieee80211_mesh_route *rtorig = NULL;
1379 struct ieee80211_mesh_route *rtext = NULL;
1380 struct ieee80211_hwmp_route *hr;
1381 struct ieee80211com *ic = vap->iv_ic;
1382 struct mbuf *m, *next;
1383 uint32_t metric = 0;
1384 const uint8_t *addr;
1385
1386 #if defined(__DragonFly__)
1387 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1388 "received PREP, orig %s, targ %s",
1389 ether_sprintf(prep->prep_origaddr),
1390 ether_sprintf(prep->prep_targetaddr));
1391 #else
1392 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1393 "received PREP, orig %6D, targ %6D", prep->prep_origaddr, ":",
1394 prep->prep_targetaddr, ":");
1395 #endif
1396
1397 /*
1398 * Acceptance criteria: (If the corresponding PREP was not generated
1399 * by us OR not generated by an external mac that is not proxied by us)
1400 * AND forwarding is disabled, discard this PREP.
1401 */
1402 rtorig = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
1403 if ((!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) ||
1404 (rtorig != NULL && IS_PROXY(rtorig) && !PROXIED_BY_US(rtorig))) &&
1405 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)){
1406 #if defined(__DragonFly__)
1407 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1408 "discard PREP, orig(%s) not proxied or generated by us",
1409 ether_sprintf(prep->prep_origaddr));
1410 #else
1411 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1412 "discard PREP, orig(%6D) not proxied or generated by us",
1413 prep->prep_origaddr, ":");
1414 #endif
1415 return;
1416 }
1417
1418 /* PREP ACCEPTED */
1419
1420 /*
1421 * If accepted shall create or update the active forwarding information
1422 * it maintains for the target mesh STA of the PREP (according to the
1423 * rules defined in 13.10.8.4). If the conditions for creating or
1424 * updating the forwarding information have not been met in those
1425 * rules, no further steps are applied to the PREP.
1426 */
1427 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
1428 if (rt == NULL) {
1429 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
1430 if (rt == NULL) {
1431 #if defined(__DragonFly__)
1432 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1433 "unable to add PREP path to %s",
1434 ether_sprintf(prep->prep_targetaddr));
1435 #else
1436 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1437 "unable to add PREP path to %6D",
1438 prep->prep_targetaddr, ":");
1439 #endif
1440 vap->iv_stats.is_mesh_rtaddfailed++;
1441 return;
1442 }
1443 #if defined(__DragonFly__)
1444 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1445 "adding target %s", ether_sprintf(prep->prep_targetaddr));
1446 #else
1447 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1448 "adding target %6D", prep->prep_targetaddr, ":");
1449 #endif
1450 }
1451 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1452 /* update path metric */
1453 metric = prep->prep_metric + ms->ms_pmetric->mpm_metric(ni);
1454 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
1455 if (HWMP_SEQ_LT(prep->prep_targetseq, hr->hr_seq)) {
1456 #if defined(__DragonFly__)
1457 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1458 "discard PREP from %s, old seq no %u < %u",
1459 ether_sprintf(prep->prep_targetaddr),
1460 prep->prep_targetseq, hr->hr_seq);
1461 #else
1462 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1463 "discard PREP from %6D, old seq no %u < %u",
1464 prep->prep_targetaddr, ":",
1465 prep->prep_targetseq, hr->hr_seq);
1466 #endif
1467 return;
1468 } else if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq) &&
1469 metric > rt->rt_metric) {
1470 #if defined(__DragonFly__)
1471 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1472 "discard PREP from %s, new metric %u > %u",
1473 ether_sprintf(prep->prep_targetaddr),
1474 metric, rt->rt_metric);
1475 #else
1476 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1477 "discard PREP from %6D, new metric %u > %u",
1478 prep->prep_targetaddr, ":",
1479 metric, rt->rt_metric);
1480 #endif
1481 return;
1482 }
1483 }
1484
1485 #if defined(__DragonFly__)
1486 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1487 "%s path to %s, hopcount %d:%d metric %d:%d",
1488 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1489 "prefer" : "update",
1490 ether_sprintf(prep->prep_targetaddr),
1491 rt->rt_nhops, prep->prep_hopcount + 1,
1492 rt->rt_metric, metric);
1493 #else
1494 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1495 "%s path to %6D, hopcount %d:%d metric %d:%d",
1496 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1497 "prefer" : "update",
1498 prep->prep_targetaddr, ":",
1499 rt->rt_nhops, prep->prep_hopcount + 1,
1500 rt->rt_metric, metric);
1501 #endif
1502
1503 hr->hr_seq = prep->prep_targetseq;
1504 hr->hr_preqretries = 0;
1505 IEEE80211_ADDR_COPY(rt->rt_nexthop, ni->ni_macaddr);
1506 rt->rt_metric = metric;
1507 rt->rt_nhops = prep->prep_hopcount + 1;
1508 ieee80211_mesh_rt_update(rt, prep->prep_lifetime);
1509 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
1510 /* discovery complete */
1511 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_DISCOVER;
1512 }
1513 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID; /* mark valid */
1514
1515 /* Update forwarding information to TA if metric improves */
1516 hwmp_update_transmitter(vap, ni, "PREP");
1517
1518 /*
1519 * If it's NOT for us, propagate the PREP
1520 */
1521 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
1522 prep->prep_ttl > 1 &&
1523 prep->prep_hopcount < hs->hs_maxhops) {
1524 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1525 /*
1526 * NB: We should already have setup the path to orig
1527 * mesh STA when we propagated PREQ to target mesh STA,
1528 * no PREP is generated without a corresponding PREQ.
1529 * XXX: for now just ignore.
1530 */
1531 if (rtorig == NULL) {
1532 #if defined(__DragonFly__)
1533 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1534 "received PREP for an unknown orig(%s)",
1535 ether_sprintf(prep->prep_origaddr));
1536 #else
1537 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1538 "received PREP for an unknown orig(%6D)",
1539 prep->prep_origaddr, ":");
1540 #endif
1541 return;
1542 }
1543
1544 #if defined(__DragonFly__)
1545 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1546 "propagate PREP from %s",
1547 ether_sprintf(prep->prep_targetaddr));
1548 #else
1549 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1550 "propagate PREP from %6D",
1551 prep->prep_targetaddr, ":");
1552 #endif
1553
1554 memcpy(&pprep, prep, sizeof(pprep));
1555 pprep.prep_hopcount += 1;
1556 pprep.prep_ttl -= 1;
1557 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1558 hwmp_send_prep(vap, rtorig->rt_nexthop, &pprep);
1559
1560 /* precursor list for the Target Mesh STA Address is updated */
1561 }
1562
1563 /*
1564 * Check if we received a PREP w/ AE and store target external address.
1565 * We may store target external address if recevied PREP w/ AE
1566 * and we are not final destination
1567 */
1568 if (prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE) {
1569 rtext = ieee80211_mesh_rt_find(vap,
1570 prep->prep_target_ext_addr);
1571 if (rtext == NULL) {
1572 rtext = ieee80211_mesh_rt_add(vap,
1573 prep->prep_target_ext_addr);
1574 if (rtext == NULL) {
1575 #if defined(__DragonFly__)
1576 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1577 "unable to add PREP path to proxy %s",
1578 ether_sprintf(prep->prep_targetaddr));
1579 #else
1580 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1581 "unable to add PREP path to proxy %6D",
1582 prep->prep_targetaddr, ":");
1583 #endif
1584 vap->iv_stats.is_mesh_rtaddfailed++;
1585 return;
1586 }
1587 }
1588 #if defined(__DragonFly__)
1589 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1590 "%s path to %s, hopcount %d:%d metric %d:%d",
1591 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1592 "prefer" : "update",
1593 ether_sprintf(prep->prep_target_ext_addr),
1594 rtext->rt_nhops, prep->prep_hopcount + 1,
1595 rtext->rt_metric, metric);
1596 #else
1597 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1598 "%s path to %6D, hopcount %d:%d metric %d:%d",
1599 rtext->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1600 "prefer" : "update",
1601 prep->prep_target_ext_addr, ":",
1602 rtext->rt_nhops, prep->prep_hopcount + 1,
1603 rtext->rt_metric, metric);
1604 #endif
1605
1606 rtext->rt_flags = IEEE80211_MESHRT_FLAGS_PROXY |
1607 IEEE80211_MESHRT_FLAGS_VALID;
1608 IEEE80211_ADDR_COPY(rtext->rt_dest,
1609 prep->prep_target_ext_addr);
1610 IEEE80211_ADDR_COPY(rtext->rt_mesh_gate,
1611 prep->prep_targetaddr);
1612 IEEE80211_ADDR_COPY(rtext->rt_nexthop, wh->i_addr2);
1613 rtext->rt_metric = metric;
1614 rtext->rt_lifetime = prep->prep_lifetime;
1615 rtext->rt_nhops = prep->prep_hopcount + 1;
1616 rtext->rt_ext_seq = prep->prep_origseq; /* new proxy seq */
1617 /*
1618 * XXX: proxy entries have no HWMP priv data,
1619 * nullify them to be sure?
1620 */
1621 }
1622 /*
1623 * Check for frames queued awaiting path discovery.
1624 * XXX probably can tell exactly and avoid remove call
1625 * NB: hash may have false matches, if so they will get
1626 * stuck back on the stageq because there won't be
1627 * a path.
1628 */
1629 addr = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1630 prep->prep_target_ext_addr : prep->prep_targetaddr;
1631 m = ieee80211_ageq_remove(&ic->ic_stageq,
1632 (struct ieee80211_node *)(uintptr_t)
1633 ieee80211_mac_hash(ic, addr)); /* either dest or ext_dest */
1634
1635 /*
1636 * All frames in the stageq here should be non-M_ENCAP; or things
1637 * will get very unhappy.
1638 */
1639 for (; m != NULL; m = next) {
1640 next = m->m_nextpkt;
1641 m->m_nextpkt = NULL;
1642 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1643 "flush queued frame %p len %d", m, m->m_pkthdr.len);
1644 /*
1645 * If the mbuf has M_ENCAP set, ensure we free it.
1646 * Note that after if_transmit() is called, m is invalid.
1647 */
1648 (void) ieee80211_vap_xmitpkt(vap, m);
1649 }
1650 #undef IS_PROXY
1651 #undef PROXIED_BY_US
1652 }
1653
1654 static int
1655 hwmp_send_prep(struct ieee80211vap *vap,
1656 const uint8_t da[IEEE80211_ADDR_LEN],
1657 struct ieee80211_meshprep_ie *prep)
1658 {
1659 /* NB: there's no PREP minimum interval. */
1660
1661 /*
1662 * mesh prep action frame format
1663 * [6] da
1664 * [6] sa
1665 * [6] addr3 = sa
1666 * [1] action
1667 * [1] category
1668 * [tlv] mesh path reply
1669 */
1670 prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1671 prep->prep_len = prep->prep_flags & IEEE80211_MESHPREP_FLAGS_AE ?
1672 IEEE80211_MESHPREP_BASE_SZ_AE : IEEE80211_MESHPREP_BASE_SZ;
1673 return hwmp_send_action(vap, da, (uint8_t *)prep, prep->prep_len + 2);
1674 }
1675
1676 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1677 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1678 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1679 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1680 static void
1681 hwmp_peerdown(struct ieee80211_node *ni)
1682 {
1683 struct ieee80211vap *vap = ni->ni_vap;
1684 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1685 struct ieee80211_meshperr_ie perr;
1686 struct ieee80211_mesh_route *rt;
1687 struct ieee80211_hwmp_route *hr;
1688
1689 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1690 if (rt == NULL)
1691 return;
1692 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1693 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1694 "%s", "delete route entry");
1695 perr.perr_ttl = ms->ms_ttl;
1696 perr.perr_ndests = 1;
1697 PERR_DFLAGS(0) = 0;
1698 if (hr->hr_seq == 0)
1699 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1700 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1701 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1702 PERR_DSEQ(0) = ++hr->hr_seq;
1703 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1704 /* NB: flush everything passing through peer */
1705 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1706 hwmp_send_perr(vap, broadcastaddr, &perr);
1707 }
1708 #undef PERR_DFLAGS
1709 #undef PERR_DADDR
1710 #undef PERR_DSEQ
1711 #undef PERR_DRCODE
1712
1713 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
1714 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
1715 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
1716 #define PERR_DEXTADDR(n) perr->perr_dests[n].dest_ext_addr
1717 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode
1718 static void
1719 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1720 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1721 {
1722 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1723 struct ieee80211_mesh_route *rt = NULL;
1724 struct ieee80211_mesh_route *rt_ext = NULL;
1725 struct ieee80211_hwmp_route *hr;
1726 struct ieee80211_meshperr_ie *pperr = NULL;
1727 int i, j = 0, forward = 0;
1728
1729 #if defined(__DragonFly__)
1730 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1731 "received PERR from %s", ether_sprintf(wh->i_addr2));
1732 #else
1733 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1734 "received PERR from %6D", wh->i_addr2, ":");
1735 #endif
1736
1737 /*
1738 * if forwarding is true, prepare pperr
1739 */
1740 if (ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
1741 forward = 1;
1742 #if defined(__DragonFly__)
1743 pperr = kmalloc(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
1744 M_80211_MESH_PERR, M_INTWAIT); /* XXX: magic number, 32 err dests */
1745 #else
1746 pperr = IEEE80211_MALLOC(sizeof(*perr) + 31*sizeof(*perr->perr_dests),
1747 M_80211_MESH_PERR, IEEE80211_M_NOWAIT); /* XXX: magic number, 32 err dests */
1748 #endif
1749 }
1750
1751 /*
1752 * Acceptance criteria: check if we have forwarding information
1753 * stored about destination, and that nexthop == TA of this PERR.
1754 * NB: we also build a new PERR to propagate in case we should forward.
1755 */
1756 for (i = 0; i < perr->perr_ndests; i++) {
1757 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1758 if (rt == NULL)
1759 continue;
1760 if (!IEEE80211_ADDR_EQ(rt->rt_nexthop, wh->i_addr2))
1761 continue;
1762
1763 /* found and accepted a PERR ndest element, process it... */
1764 if (forward)
1765 memcpy(&pperr->perr_dests[j], &perr->perr_dests[i],
1766 sizeof(*perr->perr_dests));
1767 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1768 switch(PERR_DFLAGS(i)) {
1769 case (IEEE80211_REASON_MESH_PERR_NO_FI):
1770 if (PERR_DSEQ(i) == 0) {
1771 hr->hr_seq++;
1772 if (forward) {
1773 pperr->perr_dests[j].dest_seq =
1774 hr->hr_seq;
1775 }
1776 } else {
1777 hr->hr_seq = PERR_DSEQ(i);
1778 }
1779 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1780 j++;
1781 break;
1782 case (IEEE80211_REASON_MESH_PERR_DEST_UNREACH):
1783 if(HWMP_SEQ_GT(PERR_DSEQ(i), hr->hr_seq)) {
1784 hr->hr_seq = PERR_DSEQ(i);
1785 rt->rt_flags &= ~IEEE80211_MESHRT_FLAGS_VALID;
1786 j++;
1787 }
1788 break;
1789 case (IEEE80211_REASON_MESH_PERR_NO_PROXY):
1790 rt_ext = ieee80211_mesh_rt_find(vap, PERR_DEXTADDR(i));
1791 if (rt_ext != NULL) {
1792 rt_ext->rt_flags &=
1793 ~IEEE80211_MESHRT_FLAGS_VALID;
1794 j++;
1795 }
1796 break;
1797 default:
1798 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1799 "PERR, unknown reason code %u\n", PERR_DFLAGS(i));
1800 goto done; /* XXX: stats?? */
1801 }
1802 ieee80211_mesh_rt_flush_peer(vap, PERR_DADDR(i));
1803 KASSERT(j < 32, ("PERR, error ndest >= 32 (%u)", j));
1804 }
1805 if (j == 0) {
1806 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL, "%s",
1807 "PERR not accepted");
1808 goto done; /* XXX: stats?? */
1809 }
1810
1811 /*
1812 * Propagate the PERR if we previously found it on our routing table.
1813 */
1814 if (forward && perr->perr_ttl > 1) {
1815 #if defined(__DragonFly__)
1816 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1817 "propagate PERR from %s", ether_sprintf(wh->i_addr2));
1818 #else
1819 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1820 "propagate PERR from %6D", wh->i_addr2, ":");
1821 #endif
1822 pperr->perr_ndests = j;
1823 pperr->perr_ttl--;
1824 hwmp_send_perr(vap, broadcastaddr, pperr);
1825 }
1826 done:
1827 if (pperr != NULL)
1828 IEEE80211_FREE(pperr, M_80211_MESH_PERR);
1829 }
1830 #undef PERR_DFLAGS
1831 #undef PERR_DADDR
1832 #undef PERR_DSEQ
1833 #undef PERR_DEXTADDR
1834 #undef PERR_DRCODE
1835
1836 static int
1837 hwmp_send_perr(struct ieee80211vap *vap,
1838 const uint8_t da[IEEE80211_ADDR_LEN],
1839 struct ieee80211_meshperr_ie *perr)
1840 {
1841 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1842 int i;
1843 uint8_t length = 0;
1844
1845 /*
1846 * Enforce PERR interval.
1847 */
1848 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1849 return EALREADY;
1850 getmicrouptime(&hs->hs_lastperr);
1851
1852 /*
1853 * mesh perr action frame format
1854 * [6] da
1855 * [6] sa
1856 * [6] addr3 = sa
1857 * [1] action
1858 * [1] category
1859 * [tlv] mesh path error
1860 */
1861 perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1862 length = IEEE80211_MESHPERR_BASE_SZ;
1863 for (i = 0; i<perr->perr_ndests; i++) {
1864 if (perr->perr_dests[i].dest_flags &
1865 IEEE80211_MESHPERR_FLAGS_AE) {
1866 length += IEEE80211_MESHPERR_DEST_SZ_AE;
1867 continue ;
1868 }
1869 length += IEEE80211_MESHPERR_DEST_SZ;
1870 }
1871 perr->perr_len =length;
1872 return hwmp_send_action(vap, da, (uint8_t *)perr, perr->perr_len+2);
1873 }
1874
1875 /*
1876 * Called from the rest of the net80211 code (mesh code for example).
1877 * NB: IEEE80211_REASON_MESH_PERR_DEST_UNREACH can be trigger by the fact that
1878 * a mesh STA is unable to forward an MSDU/MMPDU to a next-hop mesh STA.
1879 */
1880 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1881 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1882 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1883 #define PERR_DEXTADDR(n) perr.perr_dests[n].dest_ext_addr
1884 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1885 static void
1886 hwmp_senderror(struct ieee80211vap *vap,
1887 const uint8_t addr[IEEE80211_ADDR_LEN],
1888 struct ieee80211_mesh_route *rt, int rcode)
1889 {
1890 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1891 struct ieee80211_hwmp_route *hr = NULL;
1892 struct ieee80211_meshperr_ie perr;
1893
1894 if (rt != NULL)
1895 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1896 struct ieee80211_hwmp_route);
1897
1898 perr.perr_ndests = 1;
1899 perr.perr_ttl = ms->ms_ttl;
1900 PERR_DFLAGS(0) = 0;
1901 PERR_DRCODE(0) = rcode;
1902
1903 switch (rcode) {
1904 case IEEE80211_REASON_MESH_PERR_NO_FI:
1905 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1906 PERR_DSEQ(0) = 0; /* reserved */
1907 break;
1908 case IEEE80211_REASON_MESH_PERR_NO_PROXY:
1909 KASSERT(rt != NULL, ("no proxy info for sending PERR"));
1910 KASSERT(rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY,
1911 ("route is not marked proxy"));
1912 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_FLAGS_AE;
1913 IEEE80211_ADDR_COPY(PERR_DADDR(0), vap->iv_myaddr);
1914 PERR_DSEQ(0) = rt->rt_ext_seq;
1915 IEEE80211_ADDR_COPY(PERR_DEXTADDR(0), addr);
1916 break;
1917 case IEEE80211_REASON_MESH_PERR_DEST_UNREACH:
1918 KASSERT(rt != NULL, ("no route info for sending PERR"));
1919 IEEE80211_ADDR_COPY(PERR_DADDR(0), addr);
1920 PERR_DSEQ(0) = hr->hr_seq;
1921 break;
1922 default:
1923 KASSERT(0, ("unknown reason code for HWMP PERR (%u)", rcode));
1924 }
1925 hwmp_send_perr(vap, broadcastaddr, &perr);
1926 }
1927 #undef PERR_DFLAGS
1928 #undef PEER_DADDR
1929 #undef PERR_DSEQ
1930 #undef PERR_DEXTADDR
1931 #undef PERR_DRCODE
1932
1933 static void
1934 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1935 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1936 {
1937 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1938 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1939 struct ieee80211_mesh_route *rt = NULL;
1940 struct ieee80211_hwmp_route *hr;
1941 struct ieee80211_meshpreq_ie preq;
1942 struct ieee80211_meshrann_ie prann;
1943 uint32_t metric = 0;
1944
1945 if (IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
1946 return;
1947
1948 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1949 if (rt != NULL && rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) {
1950 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1951
1952 /* Acceptance criteria: if RANN.seq < stored seq, discard RANN */
1953 if (HWMP_SEQ_LT(rann->rann_seq, hr->hr_seq)) {
1954 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1955 "RANN seq %u < %u", rann->rann_seq, hr->hr_seq);
1956 return;
1957 }
1958
1959 /* Acceptance criteria: if RANN.seq == stored seq AND
1960 * RANN.metric > stored metric, discard RANN */
1961 if (HWMP_SEQ_EQ(rann->rann_seq, hr->hr_seq) &&
1962 rann->rann_metric > rt->rt_metric) {
1963 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1964 "RANN metric %u > %u", rann->rann_metric, rt->rt_metric);
1965 return;
1966 }
1967 }
1968
1969 /* RANN ACCEPTED */
1970
1971 ieee80211_hwmp_rannint = rann->rann_interval; /* XXX: mtx lock? */
1972 metric = rann->rann_metric + ms->ms_pmetric->mpm_metric(ni);
1973
1974 if (rt == NULL) {
1975 rt = ieee80211_mesh_rt_add(vap, rann->rann_addr);
1976 if (rt == NULL) {
1977 #if defined(__DragonFly__)
1978 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1979 "unable to add mac for RANN root %s",
1980 ether_sprintf(rann->rann_addr));
1981 #else
1982 IEEE80211_DISCARD(vap, IEEE80211_MSG_HWMP, wh, NULL,
1983 "unable to add mac for RANN root %6D",
1984 rann->rann_addr, ":");
1985 #endif
1986 vap->iv_stats.is_mesh_rtaddfailed++;
1987 return;
1988 }
1989 }
1990 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1991 /* Check if root is a mesh gate, mark it */
1992 if (rann->rann_flags & IEEE80211_MESHRANN_FLAGS_GATE) {
1993 struct ieee80211_mesh_gate_route *gr;
1994
1995 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_GATE;
1996 gr = ieee80211_mesh_mark_gate(vap, rann->rann_addr,
1997 rt);
1998 gr->gr_lastseq = 0; /* NOT GANN */
1999 }
2000 /* discovery timeout */
2001 ieee80211_mesh_rt_update(rt,
2002 ticks_to_msecs(ieee80211_hwmp_roottimeout));
2003
2004 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
2005 preq.preq_hopcount = 0;
2006 preq.preq_ttl = ms->ms_ttl;
2007 preq.preq_id = 0; /* reserved */
2008 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
2009 preq.preq_origseq = ++hs->hs_seq;
2010 preq.preq_lifetime = ieee80211_hwmp_roottimeout;
2011 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
2012 preq.preq_tcount = 1;
2013 preq.preq_targets[0].target_flags = IEEE80211_MESHPREQ_TFLAGS_TO;
2014 /* NB: IEEE80211_MESHPREQ_TFLAGS_USN = 0 implicitly implied */
2015 IEEE80211_ADDR_COPY(preq.preq_targets[0].target_addr, rann->rann_addr);
2016 preq.preq_targets[0].target_seq = rann->rann_seq;
2017 /* XXX: if rootconfint have not passed, we built this preq in vain */
2018 hwmp_send_preq(vap, wh->i_addr2, &preq, &hr->hr_lastrootconf,
2019 &ieee80211_hwmp_rootconfint);
2020
2021 /* propagate a RANN */
2022 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID &&
2023 rann->rann_ttl > 1 &&
2024 ms->ms_flags & IEEE80211_MESHFLAGS_FWD) {
2025 hr->hr_seq = rann->rann_seq;
2026 memcpy(&prann, rann, sizeof(prann));
2027 prann.rann_hopcount += 1;
2028 prann.rann_ttl -= 1;
2029 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
2030 hwmp_send_rann(vap, broadcastaddr, &prann);
2031 }
2032 }
2033
2034 static int
2035 hwmp_send_rann(struct ieee80211vap *vap,
2036 const uint8_t da[IEEE80211_ADDR_LEN],
2037 struct ieee80211_meshrann_ie *rann)
2038 {
2039 /*
2040 * mesh rann action frame format
2041 * [6] da
2042 * [6] sa
2043 * [6] addr3 = sa
2044 * [1] action
2045 * [1] category
2046 * [tlv] root annoucement
2047 */
2048 rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
2049 rann->rann_len = IEEE80211_MESHRANN_BASE_SZ;
2050 return hwmp_send_action(vap, da, (uint8_t *)rann, rann->rann_len + 2);
2051 }
2052
2053 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
2054 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
2055 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
2056 static void
2057 hwmp_rediscover_cb(void *arg)
2058 {
2059 struct ieee80211_mesh_route *rt = arg;
2060 struct ieee80211vap *vap = rt->rt_vap;
2061 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2062 struct ieee80211_mesh_state *ms = vap->iv_mesh;
2063 struct ieee80211_hwmp_route *hr;
2064 struct ieee80211_meshpreq_ie preq; /* Optimize: storing first preq? */
2065
2066 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID))
2067 return ; /* nothing to do */
2068
2069 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
2070 if (hr->hr_preqretries >=
2071 ieee80211_hwmp_maxpreq_retries) {
2072 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_ANY,
2073 rt->rt_dest, "%s",
2074 "max number of discovery, send queued frames to GATE");
2075 ieee80211_mesh_forward_to_gates(vap, rt);
2076 vap->iv_stats.is_mesh_fwd_nopath++;
2077 return ; /* XXX: flush queue? */
2078 }
2079
2080 hr->hr_preqretries++;
2081
2082
2083 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, rt->rt_dest,
2084 "start path rediscovery , target seq %u", hr->hr_seq);
2085 /*
2086 * Try to discover the path for this node.
2087 * Group addressed PREQ Case A
2088 */
2089 preq.preq_flags = 0;
2090 preq.preq_hopcount = 0;
2091 preq.preq_ttl = ms->ms_ttl;
2092 preq.preq_id = ++hs->hs_preqid;
2093 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
2094 preq.preq_origseq = hr->hr_origseq;
2095 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_pathtimeout);
2096 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
2097 preq.preq_tcount = 1;
2098 IEEE80211_ADDR_COPY(PREQ_TADDR(0), rt->rt_dest);
2099 PREQ_TFLAGS(0) = 0;
2100 if (ieee80211_hwmp_targetonly)
2101 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
2102 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
2103 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
2104 /* XXX check return value */
2105 hwmp_send_preq(vap, broadcastaddr, &preq, &hr->hr_lastpreq,
2106 &ieee80211_hwmp_preqminint);
2107 callout_reset(&rt->rt_discovery,
2108 ieee80211_hwmp_net_diameter_traversaltime * 2,
2109 hwmp_rediscover_cb, rt);
2110 }
2111
2112 static struct ieee80211_node *
2113 hwmp_discover(struct ieee80211vap *vap,
2114 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
2115 {
2116 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2117 struct ieee80211_mesh_state *ms = vap->iv_mesh;
2118 struct ieee80211_mesh_route *rt = NULL;
2119 struct ieee80211_hwmp_route *hr;
2120 struct ieee80211_meshpreq_ie preq;
2121 struct ieee80211_node *ni;
2122 int sendpreq = 0;
2123
2124 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
2125 ("not a mesh vap, opmode %d", vap->iv_opmode));
2126
2127 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
2128 ("%s: discovering self!", __func__));
2129
2130 ni = NULL;
2131 if (!IEEE80211_IS_MULTICAST(dest)) {
2132 rt = ieee80211_mesh_rt_find(vap, dest);
2133 if (rt == NULL) {
2134 rt = ieee80211_mesh_rt_add(vap, dest);
2135 if (rt == NULL) {
2136 #if defined(__DragonFly__)
2137 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
2138 ni, "unable to add discovery path to %s",
2139 ether_sprintf(dest));
2140 #else
2141 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
2142 ni, "unable to add discovery path to %6D",
2143 dest, ":");
2144 #endif
2145 vap->iv_stats.is_mesh_rtaddfailed++;
2146 goto done;
2147 }
2148 }
2149 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
2150 struct ieee80211_hwmp_route);
2151 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_DISCOVER) {
2152 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
2153 "%s", "already discovering queue frame until path found");
2154 sendpreq = 1;
2155 goto done;
2156 }
2157 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
2158 if (hr->hr_lastdiscovery != 0 &&
2159 (ticks - hr->hr_lastdiscovery <
2160 (ieee80211_hwmp_net_diameter_traversaltime * 2))) {
2161 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
2162 dest, NULL, "%s",
2163 "too frequent discovery requeust");
2164 sendpreq = 1;
2165 goto done;
2166 }
2167 hr->hr_lastdiscovery = ticks;
2168 if (hr->hr_preqretries >=
2169 ieee80211_hwmp_maxpreq_retries) {
2170 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_ANY,
2171 dest, NULL, "%s",
2172 "no valid path , max number of discovery");
2173 vap->iv_stats.is_mesh_fwd_nopath++;
2174 goto done;
2175 }
2176 rt->rt_flags = IEEE80211_MESHRT_FLAGS_DISCOVER;
2177 hr->hr_preqretries++;
2178 if (hr->hr_origseq == 0)
2179 hr->hr_origseq = ++hs->hs_seq;
2180 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
2181 sendpreq = 1;
2182 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
2183 "start path discovery (src %s), target seq %u",
2184 m == NULL ? "<none>" : ether_sprintf(
2185 mtod(m, struct ether_header *)->ether_shost),
2186 hr->hr_seq);
2187 /*
2188 * Try to discover the path for this node.
2189 * Group addressed PREQ Case A
2190 */
2191 preq.preq_flags = 0;
2192 preq.preq_hopcount = 0;
2193 preq.preq_ttl = ms->ms_ttl;
2194 preq.preq_id = ++hs->hs_preqid;
2195 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
2196 preq.preq_origseq = hr->hr_origseq;
2197 preq.preq_lifetime =
2198 ticks_to_msecs(ieee80211_hwmp_pathtimeout);
2199 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
2200 preq.preq_tcount = 1;
2201 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
2202 PREQ_TFLAGS(0) = 0;
2203 if (ieee80211_hwmp_targetonly)
2204 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
2205 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
2206 PREQ_TSEQ(0) = 0; /* RESERVED when USN flag is set */
2207 /* XXX check return value */
2208 hwmp_send_preq(vap, broadcastaddr, &preq,
2209 &hr->hr_lastpreq, &ieee80211_hwmp_preqminint);
2210 callout_reset(&rt->rt_discovery,
2211 ieee80211_hwmp_net_diameter_traversaltime * 2,
2212 hwmp_rediscover_cb, rt);
2213 }
2214 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
2215 ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
2216 } else {
2217 ni = ieee80211_find_txnode(vap, dest);
2218 /* NB: if null then we leak mbuf */
2219 KASSERT(ni != NULL, ("leak mcast frame"));
2220 return ni;
2221 }
2222 done:
2223 if (ni == NULL && m != NULL) {
2224 if (sendpreq) {
2225 struct ieee80211com *ic = vap->iv_ic;
2226 /*
2227 * Queue packet for transmit when path discovery
2228 * completes. If discovery never completes the
2229 * frame will be flushed by way of the aging timer.
2230 */
2231 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
2232 "%s", "queue frame until path found");
2233 m->m_pkthdr.rcvif = (void *)(uintptr_t)
2234 ieee80211_mac_hash(ic, dest);
2235 /* XXX age chosen randomly */
2236 ieee80211_ageq_append(&ic->ic_stageq, m,
2237 IEEE80211_INACT_WAIT);
2238 } else {
2239 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
2240 dest, NULL, "%s", "no valid path to this node");
2241 m_freem(m);
2242 }
2243 }
2244 return ni;
2245 }
2246 #undef PREQ_TFLAGS
2247 #undef PREQ_TADDR
2248 #undef PREQ_TSEQ
2249
2250 static int
2251 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2252 {
2253 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2254 int error;
2255
2256 if (vap->iv_opmode != IEEE80211_M_MBSS)
2257 return ENOSYS;
2258 error = 0;
2259 switch (ireq->i_type) {
2260 case IEEE80211_IOC_HWMP_ROOTMODE:
2261 ireq->i_val = hs->hs_rootmode;
2262 break;
2263 case IEEE80211_IOC_HWMP_MAXHOPS:
2264 ireq->i_val = hs->hs_maxhops;
2265 break;
2266 default:
2267 return ENOSYS;
2268 }
2269 return error;
2270 }
2271 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
2272
2273 static int
2274 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
2275 {
2276 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
2277 int error;
2278
2279 if (vap->iv_opmode != IEEE80211_M_MBSS)
2280 return ENOSYS;
2281 error = 0;
2282 switch (ireq->i_type) {
2283 case IEEE80211_IOC_HWMP_ROOTMODE:
2284 if (ireq->i_val < 0 || ireq->i_val > 3)
2285 return EINVAL;
2286 hs->hs_rootmode = ireq->i_val;
2287 hwmp_rootmode_setup(vap);
2288 break;
2289 case IEEE80211_IOC_HWMP_MAXHOPS:
2290 if (ireq->i_val <= 0 || ireq->i_val > 255)
2291 return EINVAL;
2292 hs->hs_maxhops = ireq->i_val;
2293 break;
2294 default:
2295 return ENOSYS;
2296 }
2297 return error;
2298 }
2299 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);
DragonFly BSD