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/8.0/sys/net80211/ieee80211_hwmp.c 198188 2009-10-17 13:42:23Z 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_targetseq; /* 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 if (ms->ms_flags & IEEE80211_MESHFLAGS_PORTAL)
657 rann.rann_flags |= IEEE80211_MESHRANN_FLAGS_PR;
658 rann.rann_hopcount = 0;
659 rann.rann_ttl = ms->ms_ttl;
660 IEEE80211_ADDR_COPY(rann.rann_addr, vap->iv_myaddr);
661 rann.rann_seq = ++hs->hs_seq;
662 rann.rann_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
663
664 vap->iv_stats.is_hwmp_rootrann++;
665 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &rann);
666 hwmp_rootmode_setup(vap);
667 }
668
669 #define PREQ_TFLAGS(n) preq->preq_targets[n].target_flags
670 #define PREQ_TADDR(n) preq->preq_targets[n].target_addr
671 #define PREQ_TSEQ(n) preq->preq_targets[n].target_seq
672 static void
673 hwmp_recv_preq(struct ieee80211vap *vap, struct ieee80211_node *ni,
674 const struct ieee80211_frame *wh, const struct ieee80211_meshpreq_ie *preq)
675 {
676 struct ieee80211_mesh_state *ms = vap->iv_mesh;
677 struct ieee80211_mesh_route *rt = NULL;
678 struct ieee80211_mesh_route *rtorig = NULL;
679 struct ieee80211_hwmp_route *hrorig;
680 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
681 struct ieee80211_meshprep_ie prep;
682
683 if (ni == vap->iv_bss ||
684 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
685 return;
686 /*
687 * Ignore PREQs from us. Could happen because someone forward it
688 * back to us.
689 */
690 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, preq->preq_origaddr))
691 return;
692
693 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
694 "received PREQ, source %s", ether_sprintf(preq->preq_origaddr));
695
696 /*
697 * Acceptance criteria: if the PREQ is not for us and
698 * forwarding is disabled, discard this PREQ.
699 */
700 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0)) &&
701 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
702 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
703 preq->preq_origaddr, NULL, "%s", "not accepting PREQ");
704 return;
705 }
706 rtorig = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
707 if (rtorig == NULL)
708 rtorig = ieee80211_mesh_rt_add(vap, preq->preq_origaddr);
709 hrorig = IEEE80211_MESH_ROUTE_PRIV(rtorig, struct ieee80211_hwmp_route);
710 /*
711 * Sequence number validation.
712 */
713 if (HWMP_SEQ_LEQ(preq->preq_id, hrorig->hr_preqid) &&
714 HWMP_SEQ_LEQ(preq->preq_origseq, hrorig->hr_seq)) {
715 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
716 "discard PREQ from %s, old seq no %u <= %u",
717 ether_sprintf(preq->preq_origaddr),
718 preq->preq_origseq, hrorig->hr_seq);
719 return;
720 }
721 hrorig->hr_preqid = preq->preq_id;
722 hrorig->hr_seq = preq->preq_origseq;
723
724 /*
725 * Check if the PREQ is addressed to us.
726 */
727 if (IEEE80211_ADDR_EQ(vap->iv_myaddr, PREQ_TADDR(0))) {
728 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
729 "reply to %s", ether_sprintf(preq->preq_origaddr));
730 /*
731 * Build and send a PREP frame.
732 */
733 prep.prep_flags = 0;
734 prep.prep_hopcount = 0;
735 prep.prep_ttl = ms->ms_ttl;
736 IEEE80211_ADDR_COPY(prep.prep_targetaddr, preq->preq_origaddr);
737 prep.prep_targetseq = preq->preq_origseq;
738 prep.prep_lifetime = preq->preq_lifetime;
739 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
740 IEEE80211_ADDR_COPY(prep.prep_origaddr, vap->iv_myaddr);
741 prep.prep_origseq = ++hs->hs_seq;
742 hwmp_send_prep(ni, vap->iv_myaddr, wh->i_addr2, &prep);
743 /*
744 * Build the reverse path, if we don't have it already.
745 */
746 rt = ieee80211_mesh_rt_find(vap, preq->preq_origaddr);
747 if (rt == NULL)
748 hwmp_discover(vap, preq->preq_origaddr, NULL);
749 else if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0)
750 hwmp_discover(vap, rt->rt_dest, NULL);
751 return;
752 }
753 /*
754 * Proactive PREQ: reply with a proactive PREP to the
755 * root STA if requested.
756 */
757 if (IEEE80211_ADDR_EQ(PREQ_TADDR(0), broadcastaddr) &&
758 (PREQ_TFLAGS(0) &
759 ((IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF) ==
760 (IEEE80211_MESHPREQ_TFLAGS_TO|IEEE80211_MESHPREQ_TFLAGS_RF)))) {
761 uint8_t rootmac[IEEE80211_ADDR_LEN];
762
763 IEEE80211_ADDR_COPY(rootmac, preq->preq_origaddr);
764 rt = ieee80211_mesh_rt_find(vap, rootmac);
765 if (rt == NULL) {
766 rt = ieee80211_mesh_rt_add(vap, rootmac);
767 if (rt == NULL) {
768 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
769 "unable to add root mesh path to %s",
770 ether_sprintf(rootmac));
771 vap->iv_stats.is_mesh_rtaddfailed++;
772 return;
773 }
774 }
775 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
776 "root mesh station @ %s", ether_sprintf(rootmac));
777
778 /*
779 * Reply with a PREP if we don't have a path to the root
780 * or if the root sent us a proactive PREQ.
781 */
782 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
783 (preq->preq_flags & IEEE80211_MESHPREQ_FLAGS_PP)) {
784 prep.prep_flags = 0;
785 prep.prep_hopcount = 0;
786 prep.prep_ttl = ms->ms_ttl;
787 IEEE80211_ADDR_COPY(prep.prep_origaddr, vap->iv_myaddr);
788 prep.prep_origseq = preq->preq_origseq;
789 prep.prep_targetseq = ++hs->hs_seq;
790 prep.prep_lifetime = preq->preq_lifetime;
791 prep.prep_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
792 IEEE80211_ADDR_COPY(prep.prep_targetaddr, rootmac);
793 prep.prep_targetseq = PREQ_TSEQ(0);
794 hwmp_send_prep(vap->iv_bss, vap->iv_myaddr,
795 broadcastaddr, &prep);
796 }
797 hwmp_discover(vap, rootmac, NULL);
798 return;
799 }
800 rt = ieee80211_mesh_rt_find(vap, PREQ_TADDR(0));
801
802 /*
803 * Forwarding and Intermediate reply for PREQs with 1 target.
804 */
805 if (preq->preq_tcount == 1) {
806 struct ieee80211_meshpreq_ie ppreq; /* propagated PREQ */
807
808 memcpy(&ppreq, preq, sizeof(ppreq));
809 /*
810 * We have a valid route to this node.
811 */
812 if (rt != NULL &&
813 (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)) {
814 if (preq->preq_ttl > 1 &&
815 preq->preq_hopcount < hs->hs_maxhops) {
816 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
817 "forward PREQ from %s",
818 ether_sprintf(preq->preq_origaddr));
819 /*
820 * Propagate the original PREQ.
821 */
822 ppreq.preq_hopcount += 1;
823 ppreq.preq_ttl -= 1;
824 ppreq.preq_metric +=
825 ms->ms_pmetric->mpm_metric(ni);
826 /*
827 * Set TO and unset RF bits because we are going
828 * to send a PREP next.
829 */
830 ppreq.preq_targets[0].target_flags |=
831 IEEE80211_MESHPREQ_TFLAGS_TO;
832 ppreq.preq_targets[0].target_flags &=
833 ~IEEE80211_MESHPREQ_TFLAGS_RF;
834 hwmp_send_preq(ni, vap->iv_myaddr,
835 broadcastaddr, &ppreq);
836 }
837 /*
838 * Check if we can send an intermediate Path Reply,
839 * i.e., Target Only bit is not set.
840 */
841 if (!(PREQ_TFLAGS(0) & IEEE80211_MESHPREQ_TFLAGS_TO)) {
842 struct ieee80211_meshprep_ie prep;
843
844 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
845 "intermediate reply for PREQ from %s",
846 ether_sprintf(preq->preq_origaddr));
847 prep.prep_flags = 0;
848 prep.prep_hopcount = rt->rt_nhops + 1;
849 prep.prep_ttl = ms->ms_ttl;
850 IEEE80211_ADDR_COPY(&prep.prep_targetaddr,
851 preq->preq_origaddr);
852 prep.prep_targetseq = hrorig->hr_seq;
853 prep.prep_lifetime = preq->preq_lifetime;
854 prep.prep_metric = rt->rt_metric +
855 ms->ms_pmetric->mpm_metric(ni);
856 IEEE80211_ADDR_COPY(&prep.prep_origaddr,
857 PREQ_TADDR(0));
858 prep.prep_origseq = hrorig->hr_seq;
859 hwmp_send_prep(ni, vap->iv_myaddr,
860 broadcastaddr, &prep);
861 }
862 /*
863 * We have no information about this path,
864 * propagate the PREQ.
865 */
866 } else if (preq->preq_ttl > 1 &&
867 preq->preq_hopcount < hs->hs_maxhops) {
868 if (rt == NULL) {
869 rt = ieee80211_mesh_rt_add(vap, PREQ_TADDR(0));
870 if (rt == NULL) {
871 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
872 ni, "unable to add PREQ path to %s",
873 ether_sprintf(PREQ_TADDR(0)));
874 vap->iv_stats.is_mesh_rtaddfailed++;
875 return;
876 }
877 }
878 rt->rt_metric = preq->preq_metric;
879 rt->rt_lifetime = preq->preq_lifetime;
880 hrorig = IEEE80211_MESH_ROUTE_PRIV(rt,
881 struct ieee80211_hwmp_route);
882 hrorig->hr_seq = preq->preq_origseq;
883 hrorig->hr_preqid = preq->preq_id;
884
885 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
886 "forward PREQ from %s",
887 ether_sprintf(preq->preq_origaddr));
888 ppreq.preq_hopcount += 1;
889 ppreq.preq_ttl -= 1;
890 ppreq.preq_metric += ms->ms_pmetric->mpm_metric(ni);
891 hwmp_send_preq(ni, vap->iv_myaddr, broadcastaddr,
892 &ppreq);
893 }
894 }
895
896 }
897 #undef PREQ_TFLAGS
898 #undef PREQ_TADDR
899 #undef PREQ_TSEQ
900
901 static int
902 hwmp_send_preq(struct ieee80211_node *ni,
903 const uint8_t sa[IEEE80211_ADDR_LEN],
904 const uint8_t da[IEEE80211_ADDR_LEN],
905 struct ieee80211_meshpreq_ie *preq)
906 {
907 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
908
909 /*
910 * Enforce PREQ interval.
911 */
912 if (ratecheck(&hs->hs_lastpreq, &ieee80211_hwmp_preqminint) == 0)
913 return EALREADY;
914 getmicrouptime(&hs->hs_lastpreq);
915
916 /*
917 * mesh preq action frame format
918 * [6] da
919 * [6] sa
920 * [6] addr3 = sa
921 * [1] action
922 * [1] category
923 * [tlv] mesh path request
924 */
925 preq->preq_ie = IEEE80211_ELEMID_MESHPREQ;
926 return hwmp_send_action(ni, sa, da, (uint8_t *)preq,
927 sizeof(struct ieee80211_meshpreq_ie));
928 }
929
930 static void
931 hwmp_recv_prep(struct ieee80211vap *vap, struct ieee80211_node *ni,
932 const struct ieee80211_frame *wh, const struct ieee80211_meshprep_ie *prep)
933 {
934 struct ieee80211_mesh_state *ms = vap->iv_mesh;
935 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
936 struct ieee80211_mesh_route *rt = NULL;
937 struct ieee80211_hwmp_route *hr;
938 struct ieee80211com *ic = vap->iv_ic;
939 struct ifnet *ifp = vap->iv_ifp;
940 struct mbuf *m, *next;
941
942 /*
943 * Acceptance criteria: if the corresponding PREQ was not generated
944 * by us and forwarding is disabled, discard this PREP.
945 */
946 if (ni == vap->iv_bss ||
947 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
948 return;
949 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_origaddr) &&
950 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
951 return;
952
953 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
954 "received PREP from %s", ether_sprintf(prep->prep_origaddr));
955
956 rt = ieee80211_mesh_rt_find(vap, prep->prep_origaddr);
957 if (rt == NULL) {
958 /*
959 * If we have no entry this could be a reply to a root PREQ.
960 */
961 if (hs->hs_rootmode != IEEE80211_HWMP_ROOTMODE_DISABLED) {
962 rt = ieee80211_mesh_rt_add(vap, prep->prep_origaddr);
963 if (rt == NULL) {
964 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
965 ni, "unable to add PREP path to %s",
966 ether_sprintf(prep->prep_origaddr));
967 vap->iv_stats.is_mesh_rtaddfailed++;
968 return;
969 }
970 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
971 rt->rt_nhops = prep->prep_hopcount;
972 rt->rt_lifetime = prep->prep_lifetime;
973 rt->rt_metric = prep->prep_metric;
974 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
975 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
976 "add root path to %s nhops %d metric %d (PREP)",
977 ether_sprintf(prep->prep_origaddr),
978 rt->rt_nhops, rt->rt_metric);
979 return;
980 }
981 return;
982 }
983 /*
984 * Sequence number validation.
985 */
986 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
987 if (HWMP_SEQ_LEQ(prep->prep_origseq, hr->hr_seq)) {
988 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
989 "discard PREP from %s, old seq no %u <= %u",
990 ether_sprintf(prep->prep_origaddr),
991 prep->prep_origseq, hr->hr_seq);
992 return;
993 }
994 hr->hr_seq = prep->prep_origseq;
995 /*
996 * If it's NOT for us, propagate the PREP.
997 */
998 if (!IEEE80211_ADDR_EQ(vap->iv_myaddr, prep->prep_targetaddr) &&
999 prep->prep_ttl > 1 && prep->prep_hopcount < hs->hs_maxhops) {
1000 struct ieee80211_meshprep_ie pprep; /* propagated PREP */
1001
1002 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1003 "propagate PREP from %s",
1004 ether_sprintf(prep->prep_origaddr));
1005
1006 memcpy(&pprep, prep, sizeof(pprep));
1007 pprep.prep_hopcount += 1;
1008 pprep.prep_ttl -= 1;
1009 pprep.prep_metric += ms->ms_pmetric->mpm_metric(ni);
1010 IEEE80211_ADDR_COPY(pprep.prep_origaddr, vap->iv_myaddr);
1011 hwmp_send_prep(ni, vap->iv_myaddr, broadcastaddr, &pprep);
1012 }
1013 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1014 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_PROXY) {
1015 /* NB: never clobber a proxy entry */;
1016 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1017 "discard PREP for %s, route is marked PROXY",
1018 ether_sprintf(prep->prep_origaddr));
1019 vap->iv_stats.is_hwmp_proxy++;
1020 } else if (prep->prep_targetseq == hr->hr_targetseq) {
1021 /*
1022 * Check if we already have a path to this node.
1023 * If we do, check if this path reply contains a
1024 * better route.
1025 */
1026 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0 ||
1027 (prep->prep_hopcount < rt->rt_nhops ||
1028 prep->prep_metric < rt->rt_metric)) {
1029 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1030 "%s path to %s, hopcount %d:%d metric %d:%d",
1031 rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID ?
1032 "prefer" : "update",
1033 ether_sprintf(prep->prep_origaddr),
1034 rt->rt_nhops, prep->prep_hopcount,
1035 rt->rt_metric, prep->prep_metric);
1036 IEEE80211_ADDR_COPY(rt->rt_nexthop, wh->i_addr2);
1037 rt->rt_nhops = prep->prep_hopcount;
1038 rt->rt_lifetime = prep->prep_lifetime;
1039 rt->rt_metric = prep->prep_metric;
1040 rt->rt_flags |= IEEE80211_MESHRT_FLAGS_VALID;
1041 } else {
1042 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1043 "ignore PREP for %s, hopcount %d:%d metric %d:%d",
1044 ether_sprintf(prep->prep_origaddr),
1045 rt->rt_nhops, prep->prep_hopcount,
1046 rt->rt_metric, prep->prep_metric);
1047 }
1048 } else {
1049 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1050 "discard PREP for %s, wrong seqno %u != %u",
1051 ether_sprintf(prep->prep_origaddr), prep->prep_targetseq,
1052 hr->hr_seq);
1053 vap->iv_stats.is_hwmp_wrongseq++;
1054 }
1055 /*
1056 * Check for frames queued awaiting path discovery.
1057 * XXX probably can tell exactly and avoid remove call
1058 * NB: hash may have false matches, if so they will get
1059 * stuck back on the stageq because there won't be
1060 * a path.
1061 */
1062 m = ieee80211_ageq_remove(&ic->ic_stageq,
1063 (struct ieee80211_node *)(uintptr_t)
1064 ieee80211_mac_hash(ic, rt->rt_dest));
1065 for (; m != NULL; m = next) {
1066 next = m->m_nextpkt;
1067 m->m_nextpkt = NULL;
1068 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1069 "flush queued frame %p len %d", m, m->m_pkthdr.len);
1070 ifp->if_transmit(ifp, m);
1071 }
1072 }
1073
1074 static int
1075 hwmp_send_prep(struct ieee80211_node *ni,
1076 const uint8_t sa[IEEE80211_ADDR_LEN],
1077 const uint8_t da[IEEE80211_ADDR_LEN],
1078 struct ieee80211_meshprep_ie *prep)
1079 {
1080 /* NB: there's no PREP minimum interval. */
1081
1082 /*
1083 * mesh prep action frame format
1084 * [6] da
1085 * [6] sa
1086 * [6] addr3 = sa
1087 * [1] action
1088 * [1] category
1089 * [tlv] mesh path reply
1090 */
1091 prep->prep_ie = IEEE80211_ELEMID_MESHPREP;
1092 return hwmp_send_action(ni, sa, da, (uint8_t *)prep,
1093 sizeof(struct ieee80211_meshprep_ie));
1094 }
1095
1096 #define PERR_DFLAGS(n) perr.perr_dests[n].dest_flags
1097 #define PERR_DADDR(n) perr.perr_dests[n].dest_addr
1098 #define PERR_DSEQ(n) perr.perr_dests[n].dest_seq
1099 #define PERR_DRCODE(n) perr.perr_dests[n].dest_rcode
1100 static void
1101 hwmp_peerdown(struct ieee80211_node *ni)
1102 {
1103 struct ieee80211vap *vap = ni->ni_vap;
1104 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1105 struct ieee80211_meshperr_ie perr;
1106 struct ieee80211_mesh_route *rt;
1107 struct ieee80211_hwmp_route *hr;
1108
1109 rt = ieee80211_mesh_rt_find(vap, ni->ni_macaddr);
1110 if (rt == NULL)
1111 return;
1112 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1113 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1114 "%s", "delete route entry");
1115 perr.perr_ttl = ms->ms_ttl;
1116 perr.perr_ndests = 1;
1117 if (hr->hr_seq == 0)
1118 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_USN;
1119 PERR_DFLAGS(0) |= IEEE80211_MESHPERR_DFLAGS_RC;
1120 IEEE80211_ADDR_COPY(PERR_DADDR(0), rt->rt_dest);
1121 PERR_DSEQ(0) = hr->hr_seq;
1122 PERR_DRCODE(0) = IEEE80211_REASON_MESH_PERR_DEST_UNREACH;
1123 /* NB: flush everything passing through peer */
1124 ieee80211_mesh_rt_flush_peer(vap, ni->ni_macaddr);
1125 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr, &perr);
1126 }
1127 #undef PERR_DFLAGS
1128 #undef PERR_DADDR
1129 #undef PERR_DSEQ
1130 #undef PERR_DRCODE
1131
1132 #define PERR_DFLAGS(n) perr->perr_dests[n].dest_flags
1133 #define PERR_DADDR(n) perr->perr_dests[n].dest_addr
1134 #define PERR_DSEQ(n) perr->perr_dests[n].dest_seq
1135 #define PERR_DRCODE(n) perr->perr_dests[n].dest_rcode
1136 static void
1137 hwmp_recv_perr(struct ieee80211vap *vap, struct ieee80211_node *ni,
1138 const struct ieee80211_frame *wh, const struct ieee80211_meshperr_ie *perr)
1139 {
1140 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1141 struct ieee80211_mesh_route *rt = NULL;
1142 struct ieee80211_hwmp_route *hr;
1143 struct ieee80211_meshperr_ie pperr;
1144 int i, forward = 0;
1145
1146 /*
1147 * Acceptance criteria: check if we received a PERR from a
1148 * neighbor and forwarding is enabled.
1149 */
1150 if (ni == vap->iv_bss ||
1151 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED ||
1152 !(ms->ms_flags & IEEE80211_MESHFLAGS_FWD))
1153 return;
1154 /*
1155 * Find all routing entries that match and delete them.
1156 */
1157 for (i = 0; i < perr->perr_ndests; i++) {
1158 rt = ieee80211_mesh_rt_find(vap, PERR_DADDR(i));
1159 if (rt == NULL)
1160 continue;
1161 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1162 if (!(PERR_DFLAGS(0) & IEEE80211_MESHPERR_DFLAGS_USN) &&
1163 HWMP_SEQ_GEQ(PERR_DSEQ(i), hr->hr_seq)) {
1164 ieee80211_mesh_rt_del(vap, rt->rt_dest);
1165 ieee80211_mesh_rt_flush_peer(vap, rt->rt_dest);
1166 rt = NULL;
1167 forward = 1;
1168 }
1169 }
1170 /*
1171 * Propagate the PERR if we previously found it on our routing table.
1172 * XXX handle ndest > 1
1173 */
1174 if (forward && perr->perr_ttl > 1) {
1175 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP, ni,
1176 "propagate PERR from %s", ether_sprintf(wh->i_addr2));
1177 memcpy(&pperr, perr, sizeof(*perr));
1178 pperr.perr_ttl--;
1179 hwmp_send_perr(vap->iv_bss, vap->iv_myaddr, broadcastaddr,
1180 &pperr);
1181 }
1182 }
1183 #undef PEER_DADDR
1184 #undef PERR_DSEQ
1185
1186 static int
1187 hwmp_send_perr(struct ieee80211_node *ni,
1188 const uint8_t sa[IEEE80211_ADDR_LEN],
1189 const uint8_t da[IEEE80211_ADDR_LEN],
1190 struct ieee80211_meshperr_ie *perr)
1191 {
1192 struct ieee80211_hwmp_state *hs = ni->ni_vap->iv_hwmp;
1193
1194 /*
1195 * Enforce PERR interval.
1196 */
1197 if (ratecheck(&hs->hs_lastperr, &ieee80211_hwmp_perrminint) == 0)
1198 return EALREADY;
1199 getmicrouptime(&hs->hs_lastperr);
1200
1201 /*
1202 * mesh perr action frame format
1203 * [6] da
1204 * [6] sa
1205 * [6] addr3 = sa
1206 * [1] action
1207 * [1] category
1208 * [tlv] mesh path error
1209 */
1210 perr->perr_ie = IEEE80211_ELEMID_MESHPERR;
1211 return hwmp_send_action(ni, sa, da, (uint8_t *)perr,
1212 sizeof(struct ieee80211_meshperr_ie));
1213 }
1214
1215 static void
1216 hwmp_recv_rann(struct ieee80211vap *vap, struct ieee80211_node *ni,
1217 const struct ieee80211_frame *wh, const struct ieee80211_meshrann_ie *rann)
1218 {
1219 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1220 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1221 struct ieee80211_mesh_route *rt = NULL;
1222 struct ieee80211_hwmp_route *hr;
1223 struct ieee80211_meshrann_ie prann;
1224
1225 if (ni == vap->iv_bss ||
1226 ni->ni_mlstate != IEEE80211_NODE_MESH_ESTABLISHED)
1227 return;
1228
1229 rt = ieee80211_mesh_rt_find(vap, rann->rann_addr);
1230 /*
1231 * Discover the path to the root mesh STA.
1232 * If we already know it, propagate the RANN element.
1233 */
1234 if (rt == NULL) {
1235 hwmp_discover(vap, rann->rann_addr, NULL);
1236 return;
1237 }
1238 hr = IEEE80211_MESH_ROUTE_PRIV(rt, struct ieee80211_hwmp_route);
1239 if (HWMP_SEQ_GT(rann->rann_seq, hr->hr_seq) && rann->rann_ttl > 1 &&
1240 rann->rann_hopcount < hs->hs_maxhops &&
1241 (ms->ms_flags & IEEE80211_MESHFLAGS_FWD)) {
1242 memcpy(&prann, rann, sizeof(prann));
1243 prann.rann_hopcount += 1;
1244 prann.rann_ttl -= 1;
1245 prann.rann_metric += ms->ms_pmetric->mpm_metric(ni);
1246 hwmp_send_rann(vap->iv_bss, vap->iv_myaddr, broadcastaddr,
1247 &prann);
1248 }
1249 }
1250
1251 static int
1252 hwmp_send_rann(struct ieee80211_node *ni,
1253 const uint8_t sa[IEEE80211_ADDR_LEN],
1254 const uint8_t da[IEEE80211_ADDR_LEN],
1255 struct ieee80211_meshrann_ie *rann)
1256 {
1257 /*
1258 * mesh rann action frame format
1259 * [6] da
1260 * [6] sa
1261 * [6] addr3 = sa
1262 * [1] action
1263 * [1] category
1264 * [tlv] root annoucement
1265 */
1266 rann->rann_ie = IEEE80211_ELEMID_MESHRANN;
1267 return hwmp_send_action(ni, sa, da, (uint8_t *)rann,
1268 sizeof(struct ieee80211_meshrann_ie));
1269 }
1270
1271 #define PREQ_TFLAGS(n) preq.preq_targets[n].target_flags
1272 #define PREQ_TADDR(n) preq.preq_targets[n].target_addr
1273 #define PREQ_TSEQ(n) preq.preq_targets[n].target_seq
1274 static struct ieee80211_node *
1275 hwmp_discover(struct ieee80211vap *vap,
1276 const uint8_t dest[IEEE80211_ADDR_LEN], struct mbuf *m)
1277 {
1278 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1279 struct ieee80211_mesh_state *ms = vap->iv_mesh;
1280 struct ieee80211_mesh_route *rt = NULL;
1281 struct ieee80211_hwmp_route *hr;
1282 struct ieee80211_meshpreq_ie preq;
1283 struct ieee80211_node *ni;
1284 int sendpreq = 0;
1285
1286 KASSERT(vap->iv_opmode == IEEE80211_M_MBSS,
1287 ("not a mesh vap, opmode %d", vap->iv_opmode));
1288
1289 KASSERT(!IEEE80211_ADDR_EQ(vap->iv_myaddr, dest),
1290 ("%s: discovering self!", __func__));
1291
1292 ni = NULL;
1293 if (!IEEE80211_IS_MULTICAST(dest)) {
1294 rt = ieee80211_mesh_rt_find(vap, dest);
1295 if (rt == NULL) {
1296 rt = ieee80211_mesh_rt_add(vap, dest);
1297 if (rt == NULL) {
1298 IEEE80211_NOTE(vap, IEEE80211_MSG_HWMP,
1299 ni, "unable to add discovery path to %s",
1300 ether_sprintf(dest));
1301 vap->iv_stats.is_mesh_rtaddfailed++;
1302 goto done;
1303 }
1304 }
1305 hr = IEEE80211_MESH_ROUTE_PRIV(rt,
1306 struct ieee80211_hwmp_route);
1307 if ((rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID) == 0) {
1308 if (hr->hr_targetseq == 0)
1309 hr->hr_targetseq = ++hs->hs_seq;
1310 rt->rt_metric = IEEE80211_MESHLMETRIC_INITIALVAL;
1311 rt->rt_lifetime =
1312 ticks_to_msecs(ieee80211_hwmp_pathtimeout);
1313 /* XXX check preq retries */
1314 sendpreq = 1;
1315 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1316 "start path discovery (src %s)",
1317 m == NULL ? "<none>" : ether_sprintf(
1318 mtod(m, struct ether_header *)->ether_shost));
1319 /*
1320 * Try to discover the path for this node.
1321 */
1322 preq.preq_flags = 0;
1323 preq.preq_hopcount = 0;
1324 preq.preq_ttl = ms->ms_ttl;
1325 preq.preq_id = ++hs->hs_preqid;
1326 IEEE80211_ADDR_COPY(preq.preq_origaddr, vap->iv_myaddr);
1327 preq.preq_origseq = hr->hr_targetseq;
1328 preq.preq_lifetime = rt->rt_lifetime;
1329 preq.preq_metric = rt->rt_metric;
1330 preq.preq_tcount = 1;
1331 IEEE80211_ADDR_COPY(PREQ_TADDR(0), dest);
1332 PREQ_TFLAGS(0) = 0;
1333 if (ieee80211_hwmp_targetonly)
1334 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_TO;
1335 if (ieee80211_hwmp_replyforward)
1336 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_RF;
1337 PREQ_TFLAGS(0) |= IEEE80211_MESHPREQ_TFLAGS_USN;
1338 PREQ_TSEQ(0) = 0;
1339 /* XXX check return value */
1340 hwmp_send_preq(vap->iv_bss, vap->iv_myaddr,
1341 broadcastaddr, &preq);
1342 }
1343 if (rt->rt_flags & IEEE80211_MESHRT_FLAGS_VALID)
1344 ni = ieee80211_find_txnode(vap, rt->rt_nexthop);
1345 } else {
1346 ni = ieee80211_find_txnode(vap, dest);
1347 /* NB: if null then we leak mbuf */
1348 KASSERT(ni != NULL, ("leak mcast frame"));
1349 return ni;
1350 }
1351 done:
1352 if (ni == NULL && m != NULL) {
1353 if (sendpreq) {
1354 struct ieee80211com *ic = vap->iv_ic;
1355 /*
1356 * Queue packet for transmit when path discovery
1357 * completes. If discovery never completes the
1358 * frame will be flushed by way of the aging timer.
1359 */
1360 IEEE80211_NOTE_MAC(vap, IEEE80211_MSG_HWMP, dest,
1361 "%s", "queue frame until path found");
1362 m->m_pkthdr.rcvif = (void *)(uintptr_t)
1363 ieee80211_mac_hash(ic, dest);
1364 /* XXX age chosen randomly */
1365 ieee80211_ageq_append(&ic->ic_stageq, m,
1366 IEEE80211_INACT_WAIT);
1367 } else {
1368 IEEE80211_DISCARD_MAC(vap, IEEE80211_MSG_HWMP,
1369 dest, NULL, "%s", "no valid path to this node");
1370 m_freem(m);
1371 }
1372 }
1373 return ni;
1374 }
1375 #undef PREQ_TFLAGS
1376 #undef PREQ_TADDR
1377 #undef PREQ_TSEQ
1378
1379 static int
1380 hwmp_ioctl_get80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1381 {
1382 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1383 int error;
1384
1385 if (vap->iv_opmode != IEEE80211_M_MBSS)
1386 return ENOSYS;
1387 error = 0;
1388 switch (ireq->i_type) {
1389 case IEEE80211_IOC_HWMP_ROOTMODE:
1390 ireq->i_val = hs->hs_rootmode;
1391 break;
1392 case IEEE80211_IOC_HWMP_MAXHOPS:
1393 ireq->i_val = hs->hs_maxhops;
1394 break;
1395 default:
1396 return ENOSYS;
1397 }
1398 return error;
1399 }
1400 IEEE80211_IOCTL_GET(hwmp, hwmp_ioctl_get80211);
1401
1402 static int
1403 hwmp_ioctl_set80211(struct ieee80211vap *vap, struct ieee80211req *ireq)
1404 {
1405 struct ieee80211_hwmp_state *hs = vap->iv_hwmp;
1406 int error;
1407
1408 if (vap->iv_opmode != IEEE80211_M_MBSS)
1409 return ENOSYS;
1410 error = 0;
1411 switch (ireq->i_type) {
1412 case IEEE80211_IOC_HWMP_ROOTMODE:
1413 if (ireq->i_val < 0 || ireq->i_val > 3)
1414 return EINVAL;
1415 hs->hs_rootmode = ireq->i_val;
1416 hwmp_rootmode_setup(vap);
1417 break;
1418 case IEEE80211_IOC_HWMP_MAXHOPS:
1419 if (ireq->i_val <= 0 || ireq->i_val > 255)
1420 return EINVAL;
1421 hs->hs_maxhops = ireq->i_val;
1422 break;
1423 default:
1424 return ENOSYS;
1425 }
1426 return error;
1427 }
1428 IEEE80211_IOCTL_SET(hwmp, hwmp_ioctl_set80211);
Cache object: e8a9a1a3215d250692a9cde28fdafd58
|