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: releng/8.1/sys/net80211/ieee80211_hwmp.c 208851 2010-06-05 20:51:56Z rpaulo $");
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 ieee80211_node *,
72 const uint8_t [IEEE80211_ADDR_LEN],
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 ieee80211_node *,
90 const uint8_t [IEEE80211_ADDR_LEN],
91 const uint8_t [IEEE80211_ADDR_LEN],
92 struct ieee80211_meshpreq_ie *);
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 ieee80211_node *,
97 const uint8_t [IEEE80211_ADDR_LEN],
98 const uint8_t [IEEE80211_ADDR_LEN],
99 struct ieee80211_meshprep_ie *);
100 static void hwmp_recv_perr(struct ieee80211vap *, struct ieee80211_node *,
101 const struct ieee80211_frame *,
102 const struct ieee80211_meshperr_ie *);
103 static int hwmp_send_perr(struct ieee80211_node *,
104 const uint8_t [IEEE80211_ADDR_LEN],
105 const uint8_t [IEEE80211_ADDR_LEN],
106 struct ieee80211_meshperr_ie *);
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 ieee80211_node *,
111 const uint8_t [IEEE80211_ADDR_LEN],
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 /* unalligned little endian access */
123 #define LE_WRITE_2(p, v) do { \
124 ((uint8_t *)(p))[0] = (v) & 0xff; \
125 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \
126 } while (0)
127 #define LE_WRITE_4(p, v) do { \
128 ((uint8_t *)(p))[0] = (v) & 0xff; \
129 ((uint8_t *)(p))[1] = ((v) >> 8) & 0xff; \
130 ((uint8_t *)(p))[2] = ((v) >> 16) & 0xff; \
131 ((uint8_t *)(p))[3] = ((v) >> 24) & 0xff; \
132 } while (0)
133
134
135 /* NB: the Target Address set in a Proactive PREQ is the broadcast address. */
136 static const uint8_t broadcastaddr[IEEE80211_ADDR_LEN] =
137 { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
138
139 typedef uint32_t ieee80211_hwmp_seq;
140 #define HWMP_SEQ_LT(a, b) ((int32_t)((a)-(b)) < 0)
141 #define HWMP_SEQ_LEQ(a, b) ((int32_t)((a)-(b)) <= 0)
142 #define HWMP_SEQ_GT(a, b) ((int32_t)((a)-(b)) > 0)
143 #define HWMP_SEQ_GEQ(a, b) ((int32_t)((a)-(b)) >= 0)
144
145 /*
146 * Private extension of ieee80211_mesh_route.
147 */
148 struct ieee80211_hwmp_route {
149 ieee80211_hwmp_seq hr_seq; /* last HWMP seq seen from dst*/
150 ieee80211_hwmp_seq hr_preqid; /* last PREQ ID seen from dst */
151 ieee80211_hwmp_seq hr_origseq; /* seq. no. on our latest PREQ*/
152 int hr_preqretries;
153 };
154 struct ieee80211_hwmp_state {
155 ieee80211_hwmp_seq hs_seq; /* next seq to be used */
156 ieee80211_hwmp_seq hs_preqid; /* next PREQ ID to be used */
157 struct timeval hs_lastpreq; /* last time we sent a PREQ */
158 struct timeval hs_lastperr; /* last time we sent a PERR */
159 int hs_rootmode; /* proactive HWMP */
160 struct callout hs_roottimer;
161 uint8_t hs_maxhops; /* max hop count */
162 };
163
164 SYSCTL_NODE(_net_wlan, OID_AUTO, hwmp, CTLFLAG_RD, 0,
165 "IEEE 802.11s HWMP parameters");
166 static int ieee80211_hwmp_targetonly = 0;
167 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, targetonly, CTLTYPE_INT | CTLFLAG_RW,
168 &ieee80211_hwmp_targetonly, 0, "Set TO bit on generated PREQs");
169 static int ieee80211_hwmp_replyforward = 1;
170 SYSCTL_INT(_net_wlan_hwmp, OID_AUTO, replyforward, CTLTYPE_INT | CTLFLAG_RW,
171 &ieee80211_hwmp_replyforward, 0, "Set RF bit on generated PREQs");
172 static int ieee80211_hwmp_pathtimeout = -1;
173 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, pathlifetime, CTLTYPE_INT | CTLFLAG_RW,
174 &ieee80211_hwmp_pathtimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
175 "path entry lifetime (ms)");
176 static int ieee80211_hwmp_roottimeout = -1;
177 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, roottimeout, CTLTYPE_INT | CTLFLAG_RW,
178 &ieee80211_hwmp_roottimeout, 0, ieee80211_sysctl_msecs_ticks, "I",
179 "root PREQ timeout (ms)");
180 static int ieee80211_hwmp_rootint = -1;
181 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rootint, CTLTYPE_INT | CTLFLAG_RW,
182 &ieee80211_hwmp_rootint, 0, ieee80211_sysctl_msecs_ticks, "I",
183 "root interval (ms)");
184 static int ieee80211_hwmp_rannint = -1;
185 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, rannint, CTLTYPE_INT | CTLFLAG_RW,
186 &ieee80211_hwmp_rannint, 0, ieee80211_sysctl_msecs_ticks, "I",
187 "root announcement interval (ms)");
188
189 #define IEEE80211_HWMP_DEFAULT_MAXHOPS 31
190
191 static ieee80211_recv_action_func hwmp_recv_action_meshpath;
192
193 static struct ieee80211_mesh_proto_path mesh_proto_hwmp = {
194 .mpp_descr = "HWMP",
195 .mpp_ie = IEEE80211_MESHCONF_PATH_HWMP,
196 .mpp_discover = hwmp_discover,
197 .mpp_peerdown = hwmp_peerdown,
198 .mpp_vattach = hwmp_vattach,
199 .mpp_vdetach = hwmp_vdetach,
200 .mpp_newstate = hwmp_newstate,
201 .mpp_privlen = sizeof(struct ieee80211_hwmp_route),
202 };
203 SYSCTL_PROC(_net_wlan_hwmp, OID_AUTO, inact, CTLTYPE_INT | CTLFLAG_RW,
204 &mesh_proto_hwmp.mpp_inact, 0, ieee80211_sysctl_msecs_ticks, "I",
205 "mesh route inactivity timeout (ms)");
206
207
208 static void
209 ieee80211_hwmp_init(void)
210 {
211 ieee80211_hwmp_pathtimeout = msecs_to_ticks(5*1000);
212 ieee80211_hwmp_roottimeout = msecs_to_ticks(5*1000);
213 ieee80211_hwmp_rootint = msecs_to_ticks(2*1000);
214 ieee80211_hwmp_rannint = msecs_to_ticks(1*1000);
215
216 /*
217 * Register action frame handler.
218 */
219 ieee80211_recv_action_register(IEEE80211_ACTION_CAT_MESHPATH,
220 IEEE80211_ACTION_MESHPATH_SEL, hwmp_recv_action_meshpath);
221
222 /* NB: default is 5 secs per spec */
223 mesh_proto_hwmp.mpp_inact = msecs_to_ticks(5*1000);
224
225 /*
226 * Register HWMP.
227 */
228 ieee80211_mesh_register_proto_path(&mesh_proto_hwmp);
229 }
230 SYSINIT(wlan_hwmp, SI_SUB_DRIVERS, SI_ORDER_SECOND, ieee80211_hwmp_init, NULL);
231
232 void
233 hwmp_vattach(struct ieee80211vap *vap)
234 {
235 struct ieee80211_hwmp_state *hs;
236
237 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
238 ("not a mesh vap, opmode %d", vap->iv_opmode));
239
240 hs = malloc(sizeof(struct ieee80211_hwmp_state), M_80211_VAP,
241 M_NOWAIT | M_ZERO);
242 if (hs == NULL) {
243 printf("%s: couldn't alloc HWMP state\n", __func__);
244 return;
245 }
246 hs->hs_maxhops = IEEE80211_HWMP_DEFAULT_MAXHOPS;
247 callout_init(&hs->hs_roottimer, CALLOUT_MPSAFE);
248 vap->iv_hwmp = hs;
249 }
250
251 void
252 hwmp_vdetach(struct ieee80211vap *vap)
253 {
254 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
255
256 callout_drain(&hs->hs_roottimer);
257 free(vap->iv_hwmp, M_80211_VAP);
258 vap->iv_hwmp = NULL;
259 }
260
261 int
262 hwmp_newstate(struct ieee80211vap *vap, enum ieee80211_state ostate, int arg)
263 {
264 enum ieee80211_state nstate = vap->iv_state;
265 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
266
267 IEEE80211_DPRINTF(vap, IEEE80211_MSG_STATE, "%s: %s -> %s (%d)\n",
268 __func__, ieee80211_state_name[ostate],
269 ieee80211_state_name[nstate], arg);
270
271 if (nstate != IEEE80211_S_RUN && ostate == IEEE80211_S_RUN)
272 callout_drain(&hs->hs_roottimer);
273 if (nstate == IEEE80211_S_RUN)
274 hwmp_rootmode_setup(vap);
275 return 0;
276 }
277
278 static int
279 hwmp_recv_action_meshpath(struct ieee80211_node *ni,
280 const struct ieee80211_frame *wh,
281 const uint8_t *frm, const uint8_t *efrm)
282 {
283 struct ieee80211vap *vap = ni->ni_vap;
284 struct ieee80211_meshpreq_ie preq;
285 struct ieee80211_meshprep_ie prep;
286 struct ieee80211_meshperr_ie perr;
287 struct ieee80211_meshrann_ie rann;
288 const uint8_t *iefrm = frm + 2; /* action + code */
289 int found = 0;
290
291 while (efrm - iefrm > 1) {
292 IEEE80211_VERIFY_LENGTH(efrm - iefrm, iefrm[1] + 2, return 0);
293 switch (*iefrm) {
294 case IEEE80211_ELEMID_MESHPREQ:
295 {
296 const struct ieee80211_meshpreq_ie *mpreq =
297 (const struct ieee80211_meshpreq_ie *) iefrm;
298 /* XXX > 1 target */
299 if (mpreq->preq_len !=
300 sizeof(struct ieee80211_meshpreq_ie) - 2) {
301 IEEE80211_DISCARD(vap,
302 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
303 wh, NULL, "%s", "PREQ with wrong len");
304 vap->iv_stats.is_rx_mgtdiscard++;
305 break;
306 }
307 memcpy(&preq, mpreq, sizeof(preq));
308 preq.preq_id = LE_READ_4(&mpreq->preq_id);
309 preq.preq_origseq = LE_READ_4(&mpreq->preq_origseq);
310 preq.preq_lifetime = LE_READ_4(&mpreq->preq_lifetime);
311 preq.preq_metric = LE_READ_4(&mpreq->preq_metric);
312 preq.preq_targets[0].target_seq =
313 LE_READ_4(&mpreq->preq_targets[0].target_seq);
314 hwmp_recv_preq(vap, ni, wh, &preq);
315 found++;
316 break;
317 }
318 case IEEE80211_ELEMID_MESHPREP:
319 {
320 const struct ieee80211_meshprep_ie *mprep =
321 (const struct ieee80211_meshprep_ie *) iefrm;
322 if (mprep->prep_len !=
323 sizeof(struct ieee80211_meshprep_ie) - 2) {
324 IEEE80211_DISCARD(vap,
325 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
326 wh, NULL, "%s", "PREP with wrong len");
327 vap->iv_stats.is_rx_mgtdiscard++;
328 break;
329 }
330 memcpy(&prep, mprep, sizeof(prep));
331 prep.prep_targetseq = LE_READ_4(&mprep->prep_targetseq);
332 prep.prep_lifetime = LE_READ_4(&mprep->prep_lifetime);
333 prep.prep_metric = LE_READ_4(&mprep->prep_metric);
334 prep.prep_origseq = LE_READ_4(&mprep->prep_origseq);
335 hwmp_recv_prep(vap, ni, wh, &prep);
336 found++;
337 break;
338 }
339 case IEEE80211_ELEMID_MESHPERR:
340 {
341 const struct ieee80211_meshperr_ie *mperr =
342 (const struct ieee80211_meshperr_ie *) iefrm;
343 /* XXX > 1 target */
344 if (mperr->perr_len !=
345 sizeof(struct ieee80211_meshperr_ie) - 2) {
346 IEEE80211_DISCARD(vap,
347 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
348 wh, NULL, "%s", "PERR with wrong len");
349 vap->iv_stats.is_rx_mgtdiscard++;
350 break;
351 }
352 memcpy(&perr, mperr, sizeof(perr));
353 perr.perr_dests[0].dest_seq =
354 LE_READ_4(&mperr->perr_dests[0].dest_seq);
355 hwmp_recv_perr(vap, ni, wh, &perr);
356 found++;
357 break;
358 }
359 case IEEE80211_ELEMID_MESHRANN:
360 {
361 const struct ieee80211_meshrann_ie *mrann =
362 (const struct ieee80211_meshrann_ie *) iefrm;
363 if (mrann->rann_len !=
364 sizeof(struct ieee80211_meshrann_ie) - 2) {
365 IEEE80211_DISCARD(vap,
366 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
367 wh, NULL, "%s", "RAN with wrong len");
368 vap->iv_stats.is_rx_mgtdiscard++;
369 return 1;
370 }
371 memcpy(&rann, mrann, sizeof(rann));
372 rann.rann_seq = LE_READ_4(&mrann->rann_seq);
373 rann.rann_metric = LE_READ_4(&mrann->rann_metric);
374 hwmp_recv_rann(vap, ni, wh, &rann);
375 found++;
376 break;
377 }
378 }
379 iefrm += iefrm[1] + 2;
380 }
381 if (!found) {
382 IEEE80211_DISCARD(vap,
383 IEEE80211_MSG_ACTION | IEEE80211_MSG_HWMP,
384 wh, NULL, "%s", "PATH SEL action without IE");
385 vap->iv_stats.is_rx_mgtdiscard++;
386 }
387 return 0;
388 }
389
390 static int
391 hwmp_send_action(struct ieee80211_node *ni,
392 const uint8_t sa[IEEE80211_ADDR_LEN],
393 const uint8_t da[IEEE80211_ADDR_LEN],
394 uint8_t *ie, size_t len)
395 {
396 struct ieee80211vap *vap = ni->ni_vap;
397 struct ieee80211com *ic = ni->ni_ic;
398 struct ieee80211_bpf_params params;
399 struct mbuf *m;
400 uint8_t *frm;
401
402 if (vap->iv_state == IEEE80211_S_CAC) {
403 IEEE80211_NOTE(vap, IEEE80211_MSG_OUTPUT, ni,
404 "block %s frame in CAC state", "HWMP action");
405 vap->iv_stats.is_tx_badstate++;
406 return EIO; /* XXX */
407 }
408
409 KASSERT(ni != NULL, ("null node"));
410 /*
411 * Hold a reference on the node so it doesn't go away until after
412 * the xmit is complete all the way in the driver. On error we
413 * will remove our reference.
414 */
415 #ifdef IEEE80211_DEBUG_REFCNT
416 IEEE80211_DPRINTF(vap, IEEE80211_MSG_NODE,
417 "ieee80211_ref_node (%s:%u) %p<%s> refcnt %d\n",
418 __func__, __LINE__,
419 ni, ether_sprintf(ni->ni_macaddr),
420 ieee80211_node_refcnt(ni)+1);
421 #endif
422 ieee80211_ref_node(ni);
423
424 m = ieee80211_getmgtframe(&frm,
425 ic->ic_headroom + sizeof(struct ieee80211_frame),
426 sizeof(struct ieee80211_action) + len
427 );
428 if (m == NULL) {
429 ieee80211_free_node(ni);
430 vap->iv_stats.is_tx_nobuf++;
431 return ENOMEM;
432 }
433 *frm++ = IEEE80211_ACTION_CAT_MESHPATH;
434 *frm++ = IEEE80211_ACTION_MESHPATH_SEL;
435 switch (*ie) {
436 case IEEE80211_ELEMID_MESHPREQ:
437 frm = hwmp_add_meshpreq(frm,
438 (struct ieee80211_meshpreq_ie *)ie);
439 break;
440 case IEEE80211_ELEMID_MESHPREP:
441 frm = hwmp_add_meshprep(frm,
442 (struct ieee80211_meshprep_ie *)ie);
443 break;
444 case IEEE80211_ELEMID_MESHPERR:
445 frm = hwmp_add_meshperr(frm,
446 (struct ieee80211_meshperr_ie *)ie);
447 break;
448 case IEEE80211_ELEMID_MESHRANN:
449 frm = hwmp_add_meshrann(frm,
450 (struct ieee80211_meshrann_ie *)ie);
451 break;
452 }
453
454 m->m_pkthdr.len = m->m_len = frm - mtod(m, uint8_t *);
455 M_PREPEND(m, sizeof(struct ieee80211_frame), M_DONTWAIT);
456 if (m == NULL) {
457 ieee80211_free_node(ni);
458 vap->iv_stats.is_tx_nobuf++;
459 return ENOMEM;
460 }
461 ieee80211_send_setup(ni, m,
462 IEEE80211_FC0_TYPE_MGT | IEEE80211_FC0_SUBTYPE_ACTION,
463 IEEE80211_NONQOS_TID, sa, da, sa);
464
465 m->m_flags |= M_ENCAP; /* mark encapsulated */
466 IEEE80211_NODE_STAT(ni, tx_mgmt);
467
468 memset(¶ms, 0, sizeof(params));
469 params.ibp_pri = WME_AC_VO;
470 params.ibp_rate0 = ni->ni_txparms->mgmtrate;
471 if (IEEE80211_IS_MULTICAST(da))
472 params.ibp_try0 = 1;
473 else
474 params.ibp_try0 = ni->ni_txparms->maxretry;
475 params.ibp_power = ni->ni_txpower;
476 return ic->ic_raw_xmit(ni, m, ¶ms);
477 }
478
479 #define ADDSHORT(frm, v) do { \
480 frm[0] = (v) & 0xff; \
481 frm[1] = (v) >> 8; \
482 frm += 2; \
483 } while (0)
484 #define ADDWORD(frm, v) do { \
485 LE_WRITE_4(frm, v); \
486 frm += 4; \
487 } while (0)
488 /*
489 * Add a Mesh Path Request IE to a frame.
490 */
491 static uint8_t *
492 hwmp_add_meshpreq(uint8_t *frm, const struct ieee80211_meshpreq_ie *preq)
493 {
494 int i;
495
496 *frm++ = IEEE80211_ELEMID_MESHPREQ;
497 *frm++ = sizeof(struct ieee80211_meshpreq_ie) - 2 +
498 (preq->preq_tcount - 1) * sizeof(*preq->preq_targets);
499 *frm++ = preq->preq_flags;
500 *frm++ = preq->preq_hopcount;
501 *frm++ = preq->preq_ttl;
502 ADDWORD(frm, preq->preq_id);
503 IEEE80211_ADDR_COPY(frm, preq->preq_origaddr); frm += 6;
504 ADDWORD(frm, preq->preq_origseq);
505 ADDWORD(frm, preq->preq_lifetime);
506 ADDWORD(frm, preq->preq_metric);
507 *frm++ = preq->preq_tcount;
508 for (i = 0; i < preq->preq_tcount; i++) {
509 *frm++ = preq->preq_targets[i].target_flags;
510 IEEE80211_ADDR_COPY(frm, preq->preq_targets[i].target_addr);
511 frm += 6;
512 ADDWORD(frm, preq->preq_targets[i].target_seq);
513 }
514 return frm;
515 }
516
517 /*
518 * Add a Mesh Path Reply IE to a frame.
519 */
520 static uint8_t *
521 hwmp_add_meshprep(uint8_t *frm, const struct ieee80211_meshprep_ie *prep)
522 {
523 *frm++ = IEEE80211_ELEMID_MESHPREP;
524 *frm++ = sizeof(struct ieee80211_meshprep_ie) - 2;
525 *frm++ = prep->prep_flags;
526 *frm++ = prep->prep_hopcount;
527 *frm++ = prep->prep_ttl;
528 IEEE80211_ADDR_COPY(frm, prep->prep_targetaddr); frm += 6;
529 ADDWORD(frm, prep->prep_targetseq);
530 ADDWORD(frm, prep->prep_lifetime);
531 ADDWORD(frm, prep->prep_metric);
532 IEEE80211_ADDR_COPY(frm, prep->prep_origaddr); frm += 6;
533 ADDWORD(frm, prep->prep_origseq);
534 return frm;
535 }
536
537 /*
538 * Add a Mesh Path Error IE to a frame.
539 */
540 static uint8_t *
541 hwmp_add_meshperr(uint8_t *frm, const struct ieee80211_meshperr_ie *perr)
542 {
543 int i;
544
545 *frm++ = IEEE80211_ELEMID_MESHPERR;
546 *frm++ = sizeof(struct ieee80211_meshperr_ie) - 2 +
547 (perr->perr_ndests - 1) * sizeof(*perr->perr_dests);
548 *frm++ = perr->perr_ttl;
549 *frm++ = perr->perr_ndests;
550 for (i = 0; i < perr->perr_ndests; i++) {
551 *frm++ = perr->perr_dests[i].dest_flags;
552 IEEE80211_ADDR_COPY(frm, perr->perr_dests[i].dest_addr);
553 frm += 6;
554 ADDWORD(frm, perr->perr_dests[i].dest_seq);
555 ADDSHORT(frm, perr->perr_dests[i].dest_rcode);
556 }
557 return frm;
558 }
559
560 /*
561 * Add a Root Annoucement IE to a frame.
562 */
563 static uint8_t *
564 hwmp_add_meshrann(uint8_t *frm, const struct ieee80211_meshrann_ie *rann)
565 {
566 *frm++ = IEEE80211_ELEMID_MESHRANN;
567 *frm++ = sizeof(struct ieee80211_meshrann_ie) - 2;
568 *frm++ = rann->rann_flags;
569 *frm++ = rann->rann_hopcount;
570 *frm++ = rann->rann_ttl;
571 IEEE80211_ADDR_COPY(frm, rann->rann_addr); frm += 6;
572 ADDWORD(frm, rann->rann_seq);
573 ADDWORD(frm, rann->rann_metric);
574 return frm;
575 }
576
577 static void
578 hwmp_rootmode_setup(struct ieee80211vap *vap)
579 {
580 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
581
582 switch (hs->hs_rootmode) {
583 case IEEE80211_HWMP_ROOTMODE_DISABLED:
584 callout_drain(&hs->hs_roottimer);
585 break;
586 case IEEE80211_HWMP_ROOTMODE_NORMAL:
587 case IEEE80211_HWMP_ROOTMODE_PROACTIVE:
588 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rootint,
589 hwmp_rootmode_cb, vap);
590 break;
591 case IEEE80211_HWMP_ROOTMODE_RANN:
592 callout_reset(&hs->hs_roottimer, ieee80211_hwmp_rannint,
593 hwmp_rootmode_rann_cb, vap);
594 break;
595 }
596 }
597
598 /*
599 * Send a broadcast Path Request to find all nodes on the mesh. We are
600 * called when the vap is configured as a HWMP root node.
601 */
602 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
603 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
604 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
605 static void
606 hwmp_rootmode_cb(void *arg)
607 {
608 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
609 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
610 struct ieee80211_mesh_state *ms = vap->iv_mesh;
611 struct ieee80211_meshpreq_ie preq;
612
613 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
614 "%s", "send broadcast PREQ");
615
616 preq.preq_flags = IEEE80211_MESHPREQ_FLAGS_AM;
617 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
618 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PR;
619 if (hs->hs_rootmode == IEEE80211_HWMP_ROOTMODE_PROACTIVE)
620 preq.preq_flags |= IEEE80211_MESHPREQ_FLAGS_PP;
621 preq.preq_hopcount = 0;
622 preq.preq_ttl = ms->ms_ttl;
623 preq.preq_id = ++hs->hs_preqid;
624 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
625 preq.preq_origseq = ++hs->hs_seq;
626 preq.preq_lifetime = ticks_to_msecs(ieee80211_hwmp_roottimeout);
627 preq.preq_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
628 preq.preq_tcount = 1;
629 IEEE80211_ADDR_COPY(PREQ_TADDR(0), broadcastaddr);
630 PREQ_TFLAGS(0) = IEEE80211_MESHPREQ_TFLAGS_TO |
631 IEEE80211_MESHPREQ_TFLAGS_RF;
632 PREQ_TSEQ(0) = 0;
633 vap->iv_stats.is_hwmp_rootreqs++;
634 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &preq);
635 hwmp_rootmode_setup(vap);
636 }
637 #undef PREQ_TFLAGS
638 #undef PREQ_TADDR
639 #undef PREQ_TSEQ
640
641 /*
642 * Send a Root Annoucement (RANN) to find all the nodes on the mesh. We are
643 * called when the vap is configured as a HWMP RANN root node.
644 */
645 static void
646 hwmp_rootmode_rann_cb(void *arg)
647 {
648 struct ieee80211vap *vap = (struct ieee80211vap *)arg;
649 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
650 struct ieee80211_mesh_state *ms = vap->iv_mesh;
651 struct ieee80211_meshrann_ie rann;
652
653 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, vap->iv_bss,
654 "%s", "send broadcast RANN");
655
656 rann.rann_flags = 0;
657 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
658 rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR;
659 rann.rann_hopcount = 0;
660 rann.rann_ttl = ms->ms_ttl;
661 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
662 rann.rann_seq = ++hs->hs_seq;
663 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
664
665 vap->iv_stats.is_hwmp_rootrann++;
666 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann);
667 hwmp_rootmode_setup(vap);
668 }
669
670 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
671 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
672 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
673 static void
674 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
675 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
676 {
677 struct ieee80211_mesh_state *ms = vap->iv_mesh;
678 struct ieee80211_mesh_route *rt = NULL;
679 struct ieee80211_mesh_route *rtorig = NULL;
680 struct ieee80211_hwmp_route *hrorig;
681 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
682 struct ieee80211_meshprep_ie prep;
683
684 if (ni == vap->iv_bss ||
685 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
686 return;
687 /*
688 * Ignore PREQs from us. Could happen because someone forward it
689 * back to us.
690 */
691 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
692 return;
693
694 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
695 "received PREQ, source %s", ether_sprintf(preq->preq_origaddr));
696
697 /*
698 * Acceptance criteria: if the PREQ is not for us and
699 * forwarding is disabled, discard this PREQ.
700 */
701 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) &&
702 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
703 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
704 preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
705 return;
706 }
707 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
708 if (rtorig == NULL)
709 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
710 if (rtorig == NULL)
711 /* XXX stat */
712 return;
713 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
714 /*
715 * Sequence number validation.
716 */
717 if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) &&
718 HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) {
719 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
720 "discard PREQ from %s, old seq no %u <= %u",
721 ether_sprintf(preq->preq_origaddr),
722 preq->preq_origseq, hrorig->hr_seq);
723 return;
724 }
725 hrorig->hr_preqid = preq->preq_id;
726 hrorig->hr_seq = preq->preq_origseq;
727
728 /*
729 * Check if the PREQ is addressed to us.
730 */
731 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
732 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
733 "reply to %s", ether_sprintf(preq->preq_origaddr));
734 /*
735 * Build and send a PREP frame.
736 */
737 prep.prep_flags = 0;
738 prep.prep_hopcount = 0;
739 prep.prep_ttl = ms->ms_ttl;
740 IEEE80211_ADDR_COPY(prep.prep_targetaddr, vap->iv_myaddr);
741 prep.prep_targetseq = ++hs->hs_seq;
742 prep.prep_lifetime = preq->preq_lifetime;
743 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
744 IEEE80211_ADDR_COPY(prep.prep_origaddr, preq->preq_origaddr);
745 prep.prep_origseq = preq->preq_origseq;
746 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep);
747 /*
748 * Build the reverse path, if we don't have it already.
749 */
750 rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
751 if (rt == NULL)
752 hwmp_discover(vap, preq->preq_origaddr, NULL);
753 else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0)
754 hwmp_discover(vap, rt->rt_dest, NULL);
755 return;
756 }
757 /*
758 * Proactive PREQ: reply with a proactive PREP to the
759 * root STA if requested.
760 */
761 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
762 (PREQ_TFLAGS(0) &
763 ((IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF) ==
764 (IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) {
765 uint8_t rootmac[IEEE80211_ADDR_LEN];
766
767 IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr);
768 rt = ieee80211_mesh_rt_find(vap, rootmac);
769 if (rt == NULL) {
770 rt = ieee80211_mesh_rt_add(vap, rootmac);
771 if (rt == NULL) {
772 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
773 "unable to add root mesh path to %s",
774 ether_sprintf(rootmac));
775 vap->iv_stats.is_mesh_rtaddfailed++;
776 return;
777 }
778 }
779 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
780 "root mesh station @ %s", ether_sprintf(rootmac));
781
782 /*
783 * Reply with a PREP if we don't have a path to the root
784 * or if the root sent us a proactive PREQ.
785 */
786 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
787 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
788 prep.prep_flags = 0;
789 prep.prep_hopcount = 0;
790 prep.prep_ttl = ms->ms_ttl;
791 IEEE80211_ADDR_COPY(prep.prep_origaddr, rootmac);
792 prep.prep_origseq = preq->preq_origseq;
793 prep.prep_lifetime = preq->preq_lifetime;
794 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
795 IEEE80211_ADDR_COPY(prep.prep_targetaddr,
796 vap->iv_myaddr);
797 prep.prep_targetseq = ++hs->hs_seq;
798 hwmp_send_prep(vap->iv_bss, vap->iv_myaddr,
799 broadcastaddr, &prep);
800 }
801 hwmp_discover(vap, rootmac, NULL);
802 return;
803 }
804 rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
805
806 /*
807 * Forwarding and Intermediate reply for PREQs with 1 target.
808 */
809 if (preq->preq_tcount == 1) {
810 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
811
812 memcpy(&ppreq, preq, sizeof(ppreq));
813 /*
814 * We have a valid route to this node.
815 */
816 if (rt != NULL &&
817 (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
818 if (preq->preq_ttl > 1 &&
819 preq->preq_hopcount < hs->hs_maxhops) {
820 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
821 "forward PREQ from %s",
822 ether_sprintf(preq->preq_origaddr));
823 /*
824 * Propagate the original PREQ.
825 */
826 ppreq.preq_hopcount += 1;
827 ppreq.preq_ttl -= 1;
828 ppreq.preq_metric +=
829 ms->ms_pmetric->mpm_metric(ni);
830 /*
831 * Set TO and unset RF bits because we are going
832 * to send a PREP next.
833 */
834 ppreq.preq_targets[0].target_flags |=
835 IEEE80211_MESHPREQ_TFLAGS_TO;
836 ppreq.preq_targets[0].target_flags &=
837 ~IEEE80211_MESHPREQ_TFLAGS_RF;
838 hwmp_send_preq(ni, vap->iv_myaddr,
839 broadcastaddr, &ppreq);
840 }
841 /*
842 * Check if we can send an intermediate Path Reply,
843 * i.e., Target Only bit is not set.
844 */
845 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
846 struct ieee80211_meshprep_ie prep;
847
848 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
849 "intermediate reply for PREQ from %s",
850 ether_sprintf(preq->preq_origaddr));
851 prep.prep_flags = 0;
852 prep.prep_hopcount = rt->rt_nhops + 1;
853 prep.prep_ttl = ms->ms_ttl;
854 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
855 PREQ_TADDR(0));
856 prep.prep_targetseq = hrorig->hr_seq;
857 prep.prep_lifetime = preq->preq_lifetime;
858 prep.prep_metric = rt->rt_metric +
859 ms->ms_pmetric->mpm_metric(ni);
860 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
861 preq->preq_origaddr);
862 prep.prep_origseq = hrorig->hr_seq;
863 hwmp_send_prep(ni, vap->iv_myaddr,
864 broadcastaddr, &prep);
865 }
866 /*
867 * We have no information about this path,
868 * propagate the PREQ.
869 */
870 } else if (preq->preq_ttl > 1 &&
871 preq->preq_hopcount < hs->hs_maxhops) {
872 if (rt == NULL) {
873 rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0));
874 if (rt == NULL) {
875 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
876 ni, "unable to add PREQ path to %s",
877 ether_sprintf(PREQ_TADDR(0)));
878 vap->iv_stats.is_mesh_rtaddfailed++;
879 return;
880 }
881 }
882 rt->rt_metric = preq->preq_metric;
883 rt->rt_lifetime = preq->preq_lifetime;
884 hrorig = IEEE80211_MESH_ROUTE_PRIV(rt,
885 struct ieee80211_hwmp_route);
886 hrorig->hr_seq = preq->preq_origseq;
887 hrorig->hr_preqid = preq->preq_id;
888
889 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
890 "forward PREQ from %s",
891 ether_sprintf(preq->preq_origaddr));
892 ppreq.preq_hopcount += 1;
893 ppreq.preq_ttl -= 1;
894 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
895 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr,
896 &ppreq);
897 }
898 }
899
900 }
901 #undef PREQ_TFLAGS
902 #undef PREQ_TADDR
903 #undef PREQ_TSEQ
904
905 static int
906 hwmp_send_preq(struct ieee80211_node *ni,
907 const uint8_t sa[IEEE80211_ADDR_LEN],
908 const uint8_t da[IEEE80211_ADDR_LEN],
909 struct ieee80211_meshpreq_ie *preq)
910 {
911 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
912
913 /*
914 * Enforce PREQ interval.
915 */
916 if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0)
917 return EALREADY;
918 getmicrouptime(&hs->hs_lastpreq);
919
920 /*
921 * mesh preq action frame format
922 * [6] da
923 * [6] sa
924 * [6] addr3 = sa
925 * [1] action
926 * [1] category
927 * [tlv] mesh path request
928 */
929 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
930 return hwmp_send_action(ni, sa, da, (uint8_t *)preq,
931 sizeof(struct ieee80211_meshpreq_ie));
932 }
933
934 static void
935 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
936 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
937 {
938 struct ieee80211_mesh_state *ms = vap->iv_mesh;
939 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
940 struct ieee80211_mesh_route *rt = NULL;
941 struct ieee80211_hwmp_route *hr;
942 struct ieee80211com *ic = vap->iv_ic;
943 struct ifnet *ifp = vap->iv_ifp;
944 struct mbuf *m, *next;
945
946 /*
947 * Acceptance criteria: if the corresponding PREQ was not generated
948 * by us and forwarding is disabled, discard this PREP.
949 */
950 if (ni == vap->iv_bss ||
951 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
952 return;
953 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
954 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
955 return;
956
957 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
958 "received PREP from %s", ether_sprintf(prep->prep_targetaddr));
959
960 rt = ieee80211_mesh_rt_find(vap, prep->prep_targetaddr);
961 if (rt == NULL) {
962 /*
963 * If we have no entry this could be a reply to a root PREQ.
964 */
965 if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) {
966 rt = ieee80211_mesh_rt_add(vap, prep->prep_targetaddr);
967 if (rt == NULL) {
968 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
969 ni, "unable to add PREP path to %s",
970 ether_sprintf(prep->prep_targetaddr));
971 vap->iv_stats.is_mesh_rtaddfailed++;
972 return;
973 }
974 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
975 rt->rt_nhops = prep->prep_hopcount;
976 rt->rt_lifetime = prep->prep_lifetime;
977 rt->rt_metric = prep->prep_metric;
978 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
979 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
980 "add root path to %s nhops %d metric %d (PREP)",
981 ether_sprintf(prep->prep_targetaddr),
982 rt->rt_nhops, rt->rt_metric);
983 return;
984 }
985 return;
986 }
987 /*
988 * Sequence number validation.
989 */
990 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
991 if (HWMP_SEQ_LEQ(prep->prep_targetseq, hr->hr_seq)) {
992 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
993 "discard PREP from %s, old seq no %u <= %u",
994 ether_sprintf(prep->prep_targetaddr),
995 prep->prep_targetseq, hr->hr_seq);
996 return;
997 }
998 hr->hr_seq = prep->prep_targetseq;
999 /*
1000 * If it's NOT for us, propagate the PREP.
1001 */
1002 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
1003 prep->prep_ttl > 1 && prep->prep_hopcount < hs->hs_maxhops) {
1004 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1005
1006 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1007 "propagate PREP from %s",
1008 ether_sprintf(prep->prep_targetaddr));
1009
1010 memcpy(&pprep, prep, sizeof(pprep));
1011 pprep.prep_hopcount += 1;
1012 pprep.prep_ttl -= 1;
1013 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1014 IEEE80211_ADDR_COPY(pprep.prep_targetaddr, vap->iv_myaddr);
1015 hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep);
1016 }
1017 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1018 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1019 /* NB: never clobber a proxy entry */;
1020 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1021 "discard PREP for %s, route is marked PROXY",
1022 ether_sprintf(prep->prep_targetaddr));
1023 vap->iv_stats.is_hwmp_proxy++;
1024 } else if (prep->prep_origseq == hr->hr_origseq) {
1025 /*
1026 * Check if we already have a path to this node.
1027 * If we do, check if this path reply contains a
1028 * better route.
1029 */
1030 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1031 (prep->prep_hopcount < rt->rt_nhops ||
1032 prep->prep_metric < rt->rt_metric)) {
1033 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1034 "%s path to %s, hopcount %d:%d metric %d:%d",
1035 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1036 "prefer" : "update",
1037 ether_sprintf(prep->prep_origaddr),
1038 rt->rt_nhops, prep->prep_hopcount,
1039 rt->rt_metric, prep->prep_metric);
1040 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
1041 rt->rt_nhops = prep->prep_hopcount;
1042 rt->rt_lifetime = prep->prep_lifetime;
1043 rt->rt_metric = prep->prep_metric;
1044 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
1045 } else {
1046 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1047 "ignore PREP for %s, hopcount %d:%d metric %d:%d",
1048 ether_sprintf(prep->prep_targetaddr),
1049 rt->rt_nhops, prep->prep_hopcount,
1050 rt->rt_metric, prep->prep_metric);
1051 }
1052 } else {
1053 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1054 "discard PREP for %s, wrong seqno %u != %u",
1055 ether_sprintf(prep->prep_targetaddr), prep->prep_origseq,
1056 hr->hr_seq);
1057 vap->iv_stats.is_hwmp_wrongseq++;
1058 }
1059 /*
1060 * Check for frames queued awaiting path discovery.
1061 * XXX probably can tell exactly and avoid remove call
1062 * NB: hash may have false matches, if so they will get
1063 * stuck back on the stageq because there won't be
1064 * a path.
1065 */
1066 m = ieee80211_ageq_remove(&ic->ic_stageq,
1067 (struct ieee80211_node *)(uintptr_t)
1068 ieee80211_mac_hash(ic, rt->rt_dest));
1069 for (; m != NULL; m = next) {
1070 next = m->m_nextpkt;
1071 m->m_nextpkt = NULL;
1072 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1073 "flush queued frame %p len %d", m, m->m_pkthdr.len);
1074 ifp->if_transmit(ifp, m);
1075 }
1076 }
1077
1078 static int
1079 hwmp_send_prep(struct ieee80211_node *ni,
1080 const uint8_t sa[IEEE80211_ADDR_LEN],
1081 const uint8_t da[IEEE80211_ADDR_LEN],
1082 struct ieee80211_meshprep_ie *prep)
1083 {
1084 /* NB: there's no PREP minimum interval. */
1085
1086 /*
1087 * mesh prep action frame format
1088 * [6] da
1089 * [6] sa
1090 * [6] addr3 = sa
1091 * [1] action
1092 * [1] category
1093 * [tlv] mesh path reply
1094 */
1095 prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1096 return hwmp_send_action(ni, sa, da, (uint8_t *)prep,
1097 sizeof(struct ieee80211_meshprep_ie));
1098 }
1099
1100 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1101 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1102 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1103 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1104 static void
1105 hwmp_peerdown(struct ieee80211_node *ni)
1106 {
1107 struct ieee80211vap *vap = ni->ni_vap;
1108 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1109 struct ieee80211_meshperr_ie perr;
1110 struct ieee80211_mesh_route *rt;
1111 struct ieee80211_hwmp_route *hr;
1112
1113 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1114 if (rt == NULL)
1115 return;
1116 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1117 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1118 "%s", "delete route entry");
1119 perr.perr_ttl = ms->ms_ttl;
1120 perr.perr_ndests = 1;
1121 PERR_DFLAGS(0) = 0;
1122 if (hr->hr_seq == 0)
1123 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1124 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1125 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1126 PERR_DSEQ(0) = hr->hr_seq;
1127 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1128 /* NB: flush everything passing through peer */
1129 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1130 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr);
1131 }
1132 #undef PERR_DFLAGS
1133 #undef PERR_DADDR
1134 #undef PERR_DSEQ
1135 #undef PERR_DRCODE
1136
1137 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
1138 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
1139 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
1140 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode
1141 static void
1142 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1143 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1144 {
1145 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1146 struct ieee80211_mesh_route *rt = NULL;
1147 struct ieee80211_hwmp_route *hr;
1148 struct ieee80211_meshperr_ie pperr;
1149 int i, forward = 0;
1150
1151 /*
1152 * Acceptance criteria: check if we received a PERR from a
1153 * neighbor and forwarding is enabled.
1154 */
1155 if (ni == vap->iv_bss ||
1156 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
1157 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
1158 return;
1159 /*
1160 * Find all routing entries that match and delete them.
1161 */
1162 for (i = 0; i < perr->perr_ndests; i++) {
1163 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1164 if (rt == NULL)
1165 continue;
1166 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1167 if (!(PERR_DFLAGS(0) & IEEE80211_MESHPERR_DFLAGS_USN) &&
1168 HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) {
1169 ieee80211_mesh_rt_del(vap, rt->rt_dest);
1170 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest);
1171 rt = NULL;
1172 forward = 1;
1173 }
1174 }
1175 /*
1176 * Propagate the PERR if we previously found it on our routing table.
1177 * XXX handle ndest > 1
1178 */
1179 if (forward && perr->perr_ttl > 1) {
1180 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1181 "propagate PERR from %s", ether_sprintf(wh->i_addr2));
1182 memcpy(&pperr, perr, sizeof(*perr));
1183 pperr.perr_ttl--;
1184 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr,
1185 &pperr);
1186 }
1187 }
1188 #undef PEER_DADDR
1189 #undef PERR_DSEQ
1190
1191 static int
1192 hwmp_send_perr(struct ieee80211_node *ni,
1193 const uint8_t sa[IEEE80211_ADDR_LEN],
1194 const uint8_t da[IEEE80211_ADDR_LEN],
1195 struct ieee80211_meshperr_ie *perr)
1196 {
1197 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
1198
1199 /*
1200 * Enforce PERR interval.
1201 */
1202 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1203 return EALREADY;
1204 getmicrouptime(&hs->hs_lastperr);
1205
1206 /*
1207 * mesh perr action frame format
1208 * [6] da
1209 * [6] sa
1210 * [6] addr3 = sa
1211 * [1] action
1212 * [1] category
1213 * [tlv] mesh path error
1214 */
1215 perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1216 return hwmp_send_action(ni, sa, da, (uint8_t *)perr,
1217 sizeof(struct ieee80211_meshperr_ie));
1218 }
1219
1220 static void
1221 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1222 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1223 {
1224 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1225 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1226 struct ieee80211_mesh_route *rt = NULL;
1227 struct ieee80211_hwmp_route *hr;
1228 struct ieee80211_meshrann_ie prann;
1229
1230 if (ni == vap->iv_bss ||
1231 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
1232 IEEE80211_ADDR_EQ(rann->rann_addr, vap->iv_myaddr))
1233 return;
1234
1235 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1236 /*
1237 * Discover the path to the root mesh STA.
1238 * If we already know it, propagate the RANN element.
1239 */
1240 if (rt == NULL) {
1241 hwmp_discover(vap, rann->rann_addr, NULL);
1242 return;
1243 }
1244 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1245 if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq)) {
1246 hr->hr_seq = rann->rann_seq;
1247 if (rann->rann_ttl > 1 &&
1248 rann->rann_hopcount < hs->hs_maxhops &&
1249 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1250 memcpy(&prann, rann, sizeof(prann));
1251 prann.rann_hopcount += 1;
1252 prann.rann_ttl -= 1;
1253 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
1254 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr,
1255 broadcastaddr, &prann);
1256 }
1257 }
1258 }
1259
1260 static int
1261 hwmp_send_rann(struct ieee80211_node *ni,
1262 const uint8_t sa[IEEE80211_ADDR_LEN],
1263 const uint8_t da[IEEE80211_ADDR_LEN],
1264 struct ieee80211_meshrann_ie *rann)
1265 {
1266 /*
1267 * mesh rann action frame format
1268 * [6] da
1269 * [6] sa
1270 * [6] addr3 = sa
1271 * [1] action
1272 * [1] category
1273 * [tlv] root annoucement
1274 */
1275 rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
1276 return hwmp_send_action(ni, sa, da, (uint8_t *)rann,
1277 sizeof(struct ieee80211_meshrann_ie));
1278 }
1279
1280 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
1281 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
1282 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
1283 static struct ieee80211_node *
1284 hwmp_discover(struct ieee80211vap *vap,
1285 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
1286 {
1287 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1288 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1289 struct ieee80211_mesh_route *rt = NULL;
1290 struct ieee80211_hwmp_route *hr;
1291 struct ieee80211_meshpreq_ie preq;
1292 struct ieee80211_node *ni;
1293 int sendpreq = 0;
1294
1295 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1296 ("not a mesh vap, opmode %d", vap->iv_opmode));
1297
1298 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
1299 ("%s: discovering self!", __func__));
1300
1301 ni = NULL;
1302 if (!IEEE80211_IS_MULTICAST(dest)) {
1303 rt = ieee80211_mesh_rt_find(vap, dest);
1304 if (rt == NULL) {
1305 rt = ieee80211_mesh_rt_add(vap, dest);
1306 if (rt == NULL) {
1307 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
1308 ni, "unable to add discovery path to %s",
1309 ether_sprintf(dest));
1310 vap->iv_stats.is_mesh_rtaddfailed++;
1311 goto done;
1312 }
1313 }
1314 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1315 struct ieee80211_hwmp_route);
1316 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
1317 if (hr->hr_origseq == 0)
1318 hr->hr_origseq = ++hs->hs_seq;
1319 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1320 rt->rt_lifetime =
1321 ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1322 /* XXX check preq retries */
1323 sendpreq = 1;
1324 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1325 "start path discovery (src %s)",
1326 m == NULL ? "<none>" : ether_sprintf(
1327 mtod(m, struct ether_header *)->ether_shost));
1328 /*
1329 * Try to discover the path for this node.
1330 */
1331 preq.preq_flags = 0;
1332 preq.preq_hopcount = 0;
1333 preq.preq_ttl = ms->ms_ttl;
1334 preq.preq_id = ++hs->hs_preqid;
1335 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1336 preq.preq_origseq = hr->hr_origseq;
1337 preq.preq_lifetime = rt->rt_lifetime;
1338 preq.preq_metric = rt->rt_metric;
1339 preq.preq_tcount = 1;
1340 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
1341 PREQ_TFLAGS(0) = 0;
1342 if (ieee80211_hwmp_targetonly)
1343 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1344 if (ieee80211_hwmp_replyforward)
1345 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF;
1346 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1347 PREQ_TSEQ(0) = 0;
1348 /* XXX check return value */
1349 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr,
1350 broadcastaddr, &preq);
1351 }
1352 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
1353 ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
1354 } else {
1355 ni = ieee80211_find_txnode(vap, dest);
1356 /* NB: if null then we leak mbuf */
1357 KASSERT(ni != NULL, ("leak mcast frame"));
1358 return ni;
1359 }
1360 done:
1361 if (ni == NULL && m != NULL) {
1362 if (sendpreq) {
1363 struct ieee80211com *ic = vap->iv_ic;
1364 /*
1365 * Queue packet for transmit when path discovery
1366 * completes. If discovery never completes the
1367 * frame will be flushed by way of the aging timer.
1368 */
1369 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1370 "%s", "queue frame until path found");
1371 m->m_pkthdr.rcvif = (void *)(uintptr_t)
1372 ieee80211_mac_hash(ic, dest);
1373 /* XXX age chosen randomly */
1374 ieee80211_ageq_append(&ic->ic_stageq, m,
1375 IEEE80211_INACT_WAIT);
1376 } else {
1377 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
1378 dest, NULL, "%s", "no valid path to this node");
1379 m_freem(m);
1380 }
1381 }
1382 return ni;
1383 }
1384 #undef PREQ_TFLAGS
1385 #undef PREQ_TADDR
1386 #undef PREQ_TSEQ
1387
1388 static int
1389 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1390 {
1391 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1392 int error;
1393
1394 if (vap->iv_opmode != IEEE80211_M_MBSS)
1395 return ENOSYS;
1396 error = 0;
1397 switch (ireq->i_type) {
1398 case IEEE80211_IOC_HWMP_ROOTMODE:
1399 ireq->i_val = hs->hs_rootmode;
1400 break;
1401 case IEEE80211_IOC_HWMP_MAXHOPS:
1402 ireq->i_val = hs->hs_maxhops;
1403 break;
1404 default:
1405 return ENOSYS;
1406 }
1407 return error;
1408 }
1409 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
1410
1411 static int
1412 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1413 {
1414 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1415 int error;
1416
1417 if (vap->iv_opmode != IEEE80211_M_MBSS)
1418 return ENOSYS;
1419 error = 0;
1420 switch (ireq->i_type) {
1421 case IEEE80211_IOC_HWMP_ROOTMODE:
1422 if (ireq->i_val < 0 || ireq->i_val > 3)
1423 return EINVAL;
1424 hs->hs_rootmode = ireq->i_val;
1425 hwmp_rootmode_setup(vap);
1426 break;
1427 case IEEE80211_IOC_HWMP_MAXHOPS:
1428 if (ireq->i_val <= 0 || ireq->i_val > 255)
1429 return EINVAL;
1430 hs->hs_maxhops = ireq->i_val;
1431 break;
1432 default:
1433 return ENOSYS;
1434 }
1435 return error;
1436 }
1437 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);
Cache object: 7c2af4e1eae842e5a39fc180abc7428f
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