1 /*
2 * WPA Supplicant - Basic mesh mode routines
3 * Copyright (c) 2013-2014, cozybit, Inc. All rights reserved.
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "utils/includes.h"
10
11 #include "utils/common.h"
12 #include "utils/eloop.h"
13 #include "utils/uuid.h"
14 #include "common/ieee802_11_defs.h"
15 #include "common/wpa_ctrl.h"
16 #include "ap/sta_info.h"
17 #include "ap/hostapd.h"
18 #include "ap/ieee802_11.h"
19 #include "config_ssid.h"
20 #include "config.h"
21 #include "wpa_supplicant_i.h"
22 #include "driver_i.h"
23 #include "notify.h"
24 #include "ap.h"
25 #include "mesh_mpm.h"
26 #include "mesh_rsn.h"
27 #include "mesh.h"
28
29
wpa_supplicant_mesh_deinit(struct wpa_supplicant * wpa_s)30 static void wpa_supplicant_mesh_deinit(struct wpa_supplicant *wpa_s)
31 {
32 wpa_supplicant_mesh_iface_deinit(wpa_s, wpa_s->ifmsh);
33 wpa_s->ifmsh = NULL;
34 wpa_s->current_ssid = NULL;
35 os_free(wpa_s->mesh_rsn);
36 wpa_s->mesh_rsn = NULL;
37 /* TODO: leave mesh (stop beacon). This will happen on link down
38 * anyway, so it's not urgent */
39 }
40
41
wpa_supplicant_mesh_iface_deinit(struct wpa_supplicant * wpa_s,struct hostapd_iface * ifmsh)42 void wpa_supplicant_mesh_iface_deinit(struct wpa_supplicant *wpa_s,
43 struct hostapd_iface *ifmsh)
44 {
45 if (!ifmsh)
46 return;
47
48 if (ifmsh->mconf) {
49 mesh_mpm_deinit(wpa_s, ifmsh);
50 if (ifmsh->mconf->ies) {
51 ifmsh->mconf->ies = NULL;
52 /* We cannot free this struct
53 * because wpa_authenticator on
54 * hostapd side is also using it
55 * for now just set to NULL and
56 * let hostapd code free it.
57 */
58 }
59 os_free(ifmsh->mconf);
60 ifmsh->mconf = NULL;
61 }
62
63 /* take care of shared data */
64 hostapd_interface_deinit(ifmsh);
65 hostapd_interface_free(ifmsh);
66 }
67
68
mesh_config_create(struct wpa_ssid * ssid)69 static struct mesh_conf * mesh_config_create(struct wpa_ssid *ssid)
70 {
71 struct mesh_conf *conf;
72
73 conf = os_zalloc(sizeof(struct mesh_conf));
74 if (!conf)
75 return NULL;
76
77 os_memcpy(conf->meshid, ssid->ssid, ssid->ssid_len);
78 conf->meshid_len = ssid->ssid_len;
79
80 if (ssid->key_mgmt & WPA_KEY_MGMT_SAE)
81 conf->security |= MESH_CONF_SEC_AUTH |
82 MESH_CONF_SEC_AMPE;
83 else
84 conf->security |= MESH_CONF_SEC_NONE;
85
86 /* defaults */
87 conf->mesh_pp_id = MESH_PATH_PROTOCOL_HWMP;
88 conf->mesh_pm_id = MESH_PATH_METRIC_AIRTIME;
89 conf->mesh_cc_id = 0;
90 conf->mesh_sp_id = MESH_SYNC_METHOD_NEIGHBOR_OFFSET;
91 conf->mesh_auth_id = (conf->security & MESH_CONF_SEC_AUTH) ? 1 : 0;
92 conf->dot11MeshMaxRetries = ssid->dot11MeshMaxRetries;
93 conf->dot11MeshRetryTimeout = ssid->dot11MeshRetryTimeout;
94 conf->dot11MeshConfirmTimeout = ssid->dot11MeshConfirmTimeout;
95 conf->dot11MeshHoldingTimeout = ssid->dot11MeshHoldingTimeout;
96
97 return conf;
98 }
99
100
wpas_mesh_copy_groups(struct hostapd_data * bss,struct wpa_supplicant * wpa_s)101 static void wpas_mesh_copy_groups(struct hostapd_data *bss,
102 struct wpa_supplicant *wpa_s)
103 {
104 int num_groups;
105 size_t groups_size;
106
107 for (num_groups = 0; wpa_s->conf->sae_groups[num_groups] > 0;
108 num_groups++)
109 ;
110
111 groups_size = (num_groups + 1) * sizeof(wpa_s->conf->sae_groups[0]);
112 bss->conf->sae_groups = os_malloc(groups_size);
113 if (bss->conf->sae_groups)
114 os_memcpy(bss->conf->sae_groups, wpa_s->conf->sae_groups,
115 groups_size);
116 }
117
118
wpa_supplicant_mesh_init(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)119 static int wpa_supplicant_mesh_init(struct wpa_supplicant *wpa_s,
120 struct wpa_ssid *ssid)
121 {
122 struct hostapd_iface *ifmsh;
123 struct hostapd_data *bss;
124 struct hostapd_config *conf;
125 struct mesh_conf *mconf;
126 int basic_rates_erp[] = { 10, 20, 55, 60, 110, 120, 240, -1 };
127 static int default_groups[] = { 19, 20, 21, 25, 26, -1 };
128 size_t len;
129 int rate_len;
130
131 if (!wpa_s->conf->user_mpm) {
132 /* not much for us to do here */
133 wpa_msg(wpa_s, MSG_WARNING,
134 "user_mpm is not enabled in configuration");
135 return 0;
136 }
137
138 wpa_s->ifmsh = ifmsh = os_zalloc(sizeof(*wpa_s->ifmsh));
139 if (!ifmsh)
140 return -ENOMEM;
141
142 ifmsh->drv_flags = wpa_s->drv_flags;
143 ifmsh->num_bss = 1;
144 ifmsh->bss = os_calloc(wpa_s->ifmsh->num_bss,
145 sizeof(struct hostapd_data *));
146 if (!ifmsh->bss)
147 goto out_free;
148
149 ifmsh->bss[0] = bss = os_zalloc(sizeof(struct hostapd_data));
150 if (!bss)
151 goto out_free;
152
153 os_memcpy(bss->own_addr, wpa_s->own_addr, ETH_ALEN);
154 bss->driver = wpa_s->driver;
155 bss->drv_priv = wpa_s->drv_priv;
156 bss->iface = ifmsh;
157 bss->mesh_sta_free_cb = mesh_mpm_free_sta;
158 wpa_s->assoc_freq = ssid->frequency;
159 wpa_s->current_ssid = ssid;
160
161 /* setup an AP config for auth processing */
162 conf = hostapd_config_defaults();
163 if (!conf)
164 goto out_free;
165
166 bss->conf = *conf->bss;
167 bss->conf->start_disabled = 1;
168 bss->conf->mesh = MESH_ENABLED;
169 bss->conf->ap_max_inactivity = wpa_s->conf->mesh_max_inactivity;
170 bss->iconf = conf;
171 ifmsh->conf = conf;
172
173 ifmsh->bss[0]->max_plinks = wpa_s->conf->max_peer_links;
174 os_strlcpy(bss->conf->iface, wpa_s->ifname, sizeof(bss->conf->iface));
175
176 mconf = mesh_config_create(ssid);
177 if (!mconf)
178 goto out_free;
179 ifmsh->mconf = mconf;
180
181 /* need conf->hw_mode for supported rates. */
182 if (ssid->frequency == 0) {
183 conf->hw_mode = HOSTAPD_MODE_IEEE80211G;
184 conf->channel = 1;
185 } else {
186 conf->hw_mode = ieee80211_freq_to_chan(ssid->frequency,
187 &conf->channel);
188 }
189 if (conf->hw_mode == NUM_HOSTAPD_MODES) {
190 wpa_printf(MSG_ERROR, "Unsupported mesh mode frequency: %d MHz",
191 ssid->frequency);
192 goto out_free;
193 }
194
195 if (ssid->mesh_basic_rates == NULL) {
196 /*
197 * XXX: Hack! This is so an MPM which correctly sets the ERP
198 * mandatory rates as BSSBasicRateSet doesn't reject us. We
199 * could add a new hw_mode HOSTAPD_MODE_IEEE80211G_ERP, but
200 * this is way easier. This also makes our BSSBasicRateSet
201 * advertised in beacons match the one in peering frames, sigh.
202 */
203 if (conf->hw_mode == HOSTAPD_MODE_IEEE80211G) {
204 conf->basic_rates = os_malloc(sizeof(basic_rates_erp));
205 if (!conf->basic_rates)
206 goto out_free;
207 os_memcpy(conf->basic_rates, basic_rates_erp,
208 sizeof(basic_rates_erp));
209 }
210 } else {
211 rate_len = 0;
212 while (1) {
213 if (ssid->mesh_basic_rates[rate_len] < 1)
214 break;
215 rate_len++;
216 }
217 conf->basic_rates = os_calloc(rate_len + 1, sizeof(int));
218 if (conf->basic_rates == NULL)
219 goto out_free;
220 os_memcpy(conf->basic_rates, ssid->mesh_basic_rates,
221 rate_len * sizeof(int));
222 conf->basic_rates[rate_len] = -1;
223 }
224
225 if (hostapd_setup_interface(ifmsh)) {
226 wpa_printf(MSG_ERROR,
227 "Failed to initialize hostapd interface for mesh");
228 return -1;
229 }
230
231 if (wpa_drv_init_mesh(wpa_s)) {
232 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh in driver");
233 return -1;
234 }
235
236 if (mconf->security != MESH_CONF_SEC_NONE) {
237 if (ssid->passphrase == NULL) {
238 wpa_printf(MSG_ERROR,
239 "mesh: Passphrase for SAE not configured");
240 goto out_free;
241 }
242
243 bss->conf->wpa = ssid->proto;
244 bss->conf->wpa_key_mgmt = ssid->key_mgmt;
245
246 if (wpa_s->conf->sae_groups &&
247 wpa_s->conf->sae_groups[0] > 0) {
248 wpas_mesh_copy_groups(bss, wpa_s);
249 } else {
250 bss->conf->sae_groups =
251 os_malloc(sizeof(default_groups));
252 if (!bss->conf->sae_groups)
253 goto out_free;
254 os_memcpy(bss->conf->sae_groups, default_groups,
255 sizeof(default_groups));
256 }
257
258 len = os_strlen(ssid->passphrase);
259 bss->conf->ssid.wpa_passphrase =
260 dup_binstr(ssid->passphrase, len);
261
262 wpa_s->mesh_rsn = mesh_rsn_auth_init(wpa_s, mconf);
263 if (!wpa_s->mesh_rsn)
264 goto out_free;
265 }
266
267 wpa_supplicant_conf_ap_ht(wpa_s, ssid, conf);
268
269 return 0;
270 out_free:
271 wpa_supplicant_mesh_deinit(wpa_s);
272 return -ENOMEM;
273 }
274
275
wpa_mesh_notify_peer(struct wpa_supplicant * wpa_s,const u8 * addr,const u8 * ies,size_t ie_len)276 void wpa_mesh_notify_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
277 const u8 *ies, size_t ie_len)
278 {
279 struct ieee802_11_elems elems;
280
281 wpa_msg(wpa_s, MSG_INFO,
282 "new peer notification for " MACSTR, MAC2STR(addr));
283
284 if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
285 wpa_msg(wpa_s, MSG_INFO, "Could not parse beacon from " MACSTR,
286 MAC2STR(addr));
287 return;
288 }
289 wpa_mesh_new_mesh_peer(wpa_s, addr, &elems);
290 }
291
292
wpa_supplicant_mesh_add_scan_ie(struct wpa_supplicant * wpa_s,struct wpabuf ** extra_ie)293 void wpa_supplicant_mesh_add_scan_ie(struct wpa_supplicant *wpa_s,
294 struct wpabuf **extra_ie)
295 {
296 /* EID + 0-length (wildcard) mesh-id */
297 size_t ielen = 2;
298
299 if (wpabuf_resize(extra_ie, ielen) == 0) {
300 wpabuf_put_u8(*extra_ie, WLAN_EID_MESH_ID);
301 wpabuf_put_u8(*extra_ie, 0);
302 }
303 }
304
305
wpa_supplicant_join_mesh(struct wpa_supplicant * wpa_s,struct wpa_ssid * ssid)306 int wpa_supplicant_join_mesh(struct wpa_supplicant *wpa_s,
307 struct wpa_ssid *ssid)
308 {
309 struct wpa_driver_mesh_join_params params;
310 int ret = 0;
311
312 if (!ssid || !ssid->ssid || !ssid->ssid_len || !ssid->frequency) {
313 ret = -ENOENT;
314 goto out;
315 }
316
317 wpa_supplicant_mesh_deinit(wpa_s);
318
319 os_memset(¶ms, 0, sizeof(params));
320 params.meshid = ssid->ssid;
321 params.meshid_len = ssid->ssid_len;
322 ibss_mesh_setup_freq(wpa_s, ssid, ¶ms.freq);
323 wpa_s->mesh_ht_enabled = !!params.freq.ht_enabled;
324 if (ssid->beacon_int > 0)
325 params.beacon_int = ssid->beacon_int;
326 else if (wpa_s->conf->beacon_int > 0)
327 params.beacon_int = wpa_s->conf->beacon_int;
328 params.max_peer_links = wpa_s->conf->max_peer_links;
329
330 if (ssid->key_mgmt & WPA_KEY_MGMT_SAE) {
331 params.flags |= WPA_DRIVER_MESH_FLAG_SAE_AUTH;
332 params.flags |= WPA_DRIVER_MESH_FLAG_AMPE;
333 wpa_s->conf->user_mpm = 1;
334 }
335
336 if (wpa_s->conf->user_mpm) {
337 params.flags |= WPA_DRIVER_MESH_FLAG_USER_MPM;
338 params.conf.flags &= ~WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
339 } else {
340 params.flags |= WPA_DRIVER_MESH_FLAG_DRIVER_MPM;
341 params.conf.flags |= WPA_DRIVER_MESH_CONF_FLAG_AUTO_PLINKS;
342 }
343 params.conf.peer_link_timeout = wpa_s->conf->mesh_max_inactivity;
344
345 if (wpa_supplicant_mesh_init(wpa_s, ssid)) {
346 wpa_msg(wpa_s, MSG_ERROR, "Failed to init mesh");
347 wpa_drv_leave_mesh(wpa_s);
348 ret = -1;
349 goto out;
350 }
351
352 if (wpa_s->ifmsh) {
353 params.ies = wpa_s->ifmsh->mconf->ies;
354 params.ie_len = wpa_s->ifmsh->mconf->ie_len;
355 params.basic_rates = wpa_s->ifmsh->basic_rates;
356 }
357
358 wpa_msg(wpa_s, MSG_INFO, "joining mesh %s",
359 wpa_ssid_txt(ssid->ssid, ssid->ssid_len));
360 ret = wpa_drv_join_mesh(wpa_s, ¶ms);
361 if (ret)
362 wpa_msg(wpa_s, MSG_ERROR, "mesh join error=%d\n", ret);
363
364 /* hostapd sets the interface down until we associate */
365 wpa_drv_set_operstate(wpa_s, 1);
366
367 out:
368 return ret;
369 }
370
371
wpa_supplicant_leave_mesh(struct wpa_supplicant * wpa_s)372 int wpa_supplicant_leave_mesh(struct wpa_supplicant *wpa_s)
373 {
374 int ret = 0;
375
376 wpa_msg(wpa_s, MSG_INFO, "leaving mesh");
377
378 /* Need to send peering close messages first */
379 wpa_supplicant_mesh_deinit(wpa_s);
380
381 ret = wpa_drv_leave_mesh(wpa_s);
382 if (ret)
383 wpa_msg(wpa_s, MSG_ERROR, "mesh leave error=%d", ret);
384
385 wpa_drv_set_operstate(wpa_s, 1);
386
387 return ret;
388 }
389
390
mesh_attr_text(const u8 * ies,size_t ies_len,char * buf,char * end)391 static int mesh_attr_text(const u8 *ies, size_t ies_len, char *buf, char *end)
392 {
393 struct ieee802_11_elems elems;
394 char *mesh_id, *pos = buf;
395 u8 *bss_basic_rate_set;
396 int bss_basic_rate_set_len, ret, i;
397
398 if (ieee802_11_parse_elems(ies, ies_len, &elems, 0) == ParseFailed)
399 return -1;
400
401 if (elems.mesh_id_len < 1)
402 return 0;
403
404 mesh_id = os_malloc(elems.mesh_id_len + 1);
405 if (mesh_id == NULL)
406 return -1;
407
408 os_memcpy(mesh_id, elems.mesh_id, elems.mesh_id_len);
409 mesh_id[elems.mesh_id_len] = '\0';
410 ret = os_snprintf(pos, end - pos, "mesh_id=%s\n", mesh_id);
411 os_free(mesh_id);
412 if (os_snprintf_error(end - pos, ret))
413 return pos - buf;
414 pos += ret;
415
416 if (elems.mesh_config_len > 6) {
417 ret = os_snprintf(pos, end - pos,
418 "active_path_selection_protocol_id=0x%02x\n"
419 "active_path_selection_metric_id=0x%02x\n"
420 "congestion_control_mode_id=0x%02x\n"
421 "synchronization_method_id=0x%02x\n"
422 "authentication_protocol_id=0x%02x\n"
423 "mesh_formation_info=0x%02x\n"
424 "mesh_capability=0x%02x\n",
425 elems.mesh_config[0], elems.mesh_config[1],
426 elems.mesh_config[2], elems.mesh_config[3],
427 elems.mesh_config[4], elems.mesh_config[5],
428 elems.mesh_config[6]);
429 if (os_snprintf_error(end - pos, ret))
430 return pos - buf;
431 pos += ret;
432 }
433
434 bss_basic_rate_set = os_malloc(elems.supp_rates_len +
435 elems.ext_supp_rates_len);
436 if (bss_basic_rate_set == NULL)
437 return -1;
438
439 bss_basic_rate_set_len = 0;
440 for (i = 0; i < elems.supp_rates_len; i++) {
441 if (elems.supp_rates[i] & 0x80) {
442 bss_basic_rate_set[bss_basic_rate_set_len++] =
443 (elems.supp_rates[i] & 0x7f) * 5;
444 }
445 }
446 for (i = 0; i < elems.ext_supp_rates_len; i++) {
447 if (elems.ext_supp_rates[i] & 0x80) {
448 bss_basic_rate_set[bss_basic_rate_set_len++] =
449 (elems.ext_supp_rates[i] & 0x7f) * 5;
450 }
451 }
452 if (bss_basic_rate_set_len > 0) {
453 ret = os_snprintf(pos, end - pos, "bss_basic_rate_set=%d",
454 bss_basic_rate_set[0]);
455 if (os_snprintf_error(end - pos, ret))
456 goto fail;
457 pos += ret;
458
459 for (i = 1; i < bss_basic_rate_set_len; i++) {
460 ret = os_snprintf(pos, end - pos, " %d",
461 bss_basic_rate_set[i]);
462 if (os_snprintf_error(end - pos, ret))
463 goto fail;
464 pos += ret;
465 }
466
467 ret = os_snprintf(pos, end - pos, "\n");
468 if (os_snprintf_error(end - pos, ret))
469 goto fail;
470 pos += ret;
471 }
472 fail:
473 os_free(bss_basic_rate_set);
474
475 return pos - buf;
476 }
477
478
wpas_mesh_scan_result_text(const u8 * ies,size_t ies_len,char * buf,char * end)479 int wpas_mesh_scan_result_text(const u8 *ies, size_t ies_len, char *buf,
480 char *end)
481 {
482 return mesh_attr_text(ies, ies_len, buf, end);
483 }
484
485
wpas_mesh_get_ifname(struct wpa_supplicant * wpa_s,char * ifname,size_t len)486 static int wpas_mesh_get_ifname(struct wpa_supplicant *wpa_s, char *ifname,
487 size_t len)
488 {
489 char *ifname_ptr = wpa_s->ifname;
490 int res;
491
492 res = os_snprintf(ifname, len, "mesh-%s-%d", ifname_ptr,
493 wpa_s->mesh_if_idx);
494 if (os_snprintf_error(len, res) ||
495 (os_strlen(ifname) >= IFNAMSIZ &&
496 os_strlen(wpa_s->ifname) < IFNAMSIZ)) {
497 /* Try to avoid going over the IFNAMSIZ length limit */
498 res = os_snprintf(ifname, len, "mesh-%d", wpa_s->mesh_if_idx);
499 if (os_snprintf_error(len, res))
500 return -1;
501 }
502 wpa_s->mesh_if_idx++;
503 return 0;
504 }
505
506
wpas_mesh_add_interface(struct wpa_supplicant * wpa_s,char * ifname,size_t len)507 int wpas_mesh_add_interface(struct wpa_supplicant *wpa_s, char *ifname,
508 size_t len)
509 {
510 struct wpa_interface iface;
511 struct wpa_supplicant *mesh_wpa_s;
512 u8 addr[ETH_ALEN];
513
514 if (ifname[0] == '\0' && wpas_mesh_get_ifname(wpa_s, ifname, len) < 0)
515 return -1;
516
517 if (wpa_drv_if_add(wpa_s, WPA_IF_MESH, ifname, NULL, NULL, NULL, addr,
518 NULL) < 0) {
519 wpa_printf(MSG_ERROR,
520 "mesh: Failed to create new mesh interface");
521 return -1;
522 }
523 wpa_printf(MSG_INFO, "mesh: Created virtual interface %s addr "
524 MACSTR, ifname, MAC2STR(addr));
525
526 os_memset(&iface, 0, sizeof(iface));
527 iface.ifname = ifname;
528 iface.driver = wpa_s->driver->name;
529 iface.driver_param = wpa_s->conf->driver_param;
530 iface.ctrl_interface = wpa_s->conf->ctrl_interface;
531
532 mesh_wpa_s = wpa_supplicant_add_iface(wpa_s->global, &iface, wpa_s);
533 if (!mesh_wpa_s) {
534 wpa_printf(MSG_ERROR,
535 "mesh: Failed to create new wpa_supplicant interface");
536 wpa_supplicant_remove_iface(wpa_s->global, wpa_s, 0);
537 return -1;
538 }
539 mesh_wpa_s->mesh_if_created = 1;
540 return 0;
541 }
542