wpa_supplicant/mesh_mpm.c

   1 /*
   2  * WPA Supplicant - Basic mesh peer management
   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 "common/ieee802_11_defs.h"
  14 #include "ap/hostapd.h"
  15 #include "ap/sta_info.h"
  16 #include "ap/ieee802_11.h"
  17 #include "wpa_supplicant_i.h"
  18 #include "driver_i.h"
  19 #include "mesh_mpm.h"
  20 #include "mesh_rsn.h"
  21
  22 struct mesh_peer_mgmt_ie {
  23         const u8 *proto_id;
  24         const u8 *llid;
  25         const u8 *plid;
  26         const u8 *reason;
  27         const u8 *pmk;
  28 };
  29
  30 static void plink_timer(void *eloop_ctx, void *user_data);
  31
  32
  33 enum plink_event {
  34         PLINK_UNDEFINED,
  35         OPN_ACPT,
  36         OPN_RJCT,
  37         OPN_IGNR,
  38         CNF_ACPT,
  39         CNF_RJCT,
  40         CNF_IGNR,
  41         CLS_ACPT,
  42         CLS_IGNR
  43 };
  44
  45 static const char * const mplstate[] = {
  46         [PLINK_LISTEN] = "LISTEN",
  47         [PLINK_OPEN_SENT] = "OPEN_SENT",
  48         [PLINK_OPEN_RCVD] = "OPEN_RCVD",
  49         [PLINK_CNF_RCVD] = "CNF_RCVD",
  50         [PLINK_ESTAB] = "ESTAB",
  51         [PLINK_HOLDING] = "HOLDING",
  52         [PLINK_BLOCKED] = "BLOCKED"
  53 };
  54
  55 static const char * const mplevent[] = {
  56         [PLINK_UNDEFINED] = "UNDEFINED",
  57         [OPN_ACPT] = "OPN_ACPT",
  58         [OPN_RJCT] = "OPN_RJCT",
  59         [OPN_IGNR] = "OPN_IGNR",
  60         [CNF_ACPT] = "CNF_ACPT",
  61         [CNF_RJCT] = "CNF_RJCT",
  62         [CNF_IGNR] = "CNF_IGNR",
  63         [CLS_ACPT] = "CLS_ACPT",
  64         [CLS_IGNR] = "CLS_IGNR"
  65 };
  66
  67
  68 static int mesh_mpm_parse_peer_mgmt(struct wpa_supplicant *wpa_s,
  69                                     u8 action_field,
  70                                     const u8 *ie, size_t len,
  71                                     struct mesh_peer_mgmt_ie *mpm_ie)
  72 {
  73         os_memset(mpm_ie, 0, sizeof(*mpm_ie));
  74
  75         /* remove optional PMK at end */
  76         if (len >= 16) {
  77                 len -= 16;
  78                 mpm_ie->pmk = ie + len - 16;
  79         }
  80
  81         if ((action_field == PLINK_OPEN && len != 4) ||
  82             (action_field == PLINK_CONFIRM && len != 6) ||
  83             (action_field == PLINK_CLOSE && len != 6 && len != 8)) {
  84                 wpa_msg(wpa_s, MSG_DEBUG, "MPM: Invalid peer mgmt ie");
  85                 return -1;
  86         }
  87
  88         /* required fields */
  89         if (len < 4)
  90                 return -1;
  91         mpm_ie->proto_id = ie;
  92         mpm_ie->llid = ie + 2;
  93         ie += 4;
  94         len -= 4;
  95
  96         /* close reason is always present at end for close */
  97         if (action_field == PLINK_CLOSE) {
  98                 if (len < 2)
  99                         return -1;
 100                 mpm_ie->reason = ie + len - 2;
 101                 len -= 2;
 102         }
 103
 104         /* plid, present for confirm, and possibly close */
 105         if (len)
 106                 mpm_ie->plid = ie;
 107
 108         return 0;
 109 }
 110
 111
 112 static int plink_free_count(struct hostapd_data *hapd)
 113 {
 114         if (hapd->max_plinks > hapd->num_plinks)
 115                 return hapd->max_plinks - hapd->num_plinks;
 116         return 0;
 117 }
 118
 119
 120 static u16 copy_supp_rates(struct wpa_supplicant *wpa_s,
 121                            struct sta_info *sta,
 122                            struct ieee802_11_elems *elems)
 123 {
 124         if (!elems->supp_rates) {
 125                 wpa_msg(wpa_s, MSG_ERROR, "no supported rates from " MACSTR,
 126                         MAC2STR(sta->addr));
 127                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 128         }
 129
 130         if (elems->supp_rates_len + elems->ext_supp_rates_len >
 131             sizeof(sta->supported_rates)) {
 132                 wpa_msg(wpa_s, MSG_ERROR,
 133                         "Invalid supported rates element length " MACSTR
 134                         " %d+%d", MAC2STR(sta->addr), elems->supp_rates_len,
 135                         elems->ext_supp_rates_len);
 136                 return WLAN_STATUS_UNSPECIFIED_FAILURE;
 137         }
 138
 139         sta->supported_rates_len = merge_byte_arrays(
 140                 sta->supported_rates, sizeof(sta->supported_rates),
 141                 elems->supp_rates, elems->supp_rates_len,
 142                 elems->ext_supp_rates, elems->ext_supp_rates_len);
 143
 144         return WLAN_STATUS_SUCCESS;
 145 }
 146
 147
 148 /* return true if elems from a neighbor match this MBSS */
 149 static Boolean matches_local(struct wpa_supplicant *wpa_s,
 150                              struct ieee802_11_elems *elems)
 151 {
 152         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 153
 154         if (elems->mesh_config_len < 5)
 155                 return FALSE;
 156
 157         return (mconf->meshid_len == elems->mesh_id_len &&
 158                 os_memcmp(mconf->meshid, elems->mesh_id,
 159                           elems->mesh_id_len) == 0 &&
 160                 mconf->mesh_pp_id == elems->mesh_config[0] &&
 161                 mconf->mesh_pm_id == elems->mesh_config[1] &&
 162                 mconf->mesh_cc_id == elems->mesh_config[2] &&
 163                 mconf->mesh_sp_id == elems->mesh_config[3] &&
 164                 mconf->mesh_auth_id == elems->mesh_config[4]);
 165 }
 166
 167
 168 /* check if local link id is already used with another peer */
 169 static Boolean llid_in_use(struct wpa_supplicant *wpa_s, u16 llid)
 170 {
 171         struct sta_info *sta;
 172         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 173
 174         for (sta = hapd->sta_list; sta; sta = sta->next) {
 175                 if (sta->my_lid == llid)
 176                         return TRUE;
 177         }
 178
 179         return FALSE;
 180 }
 181
 182
 183 /* generate an llid for a link and set to initial state */
 184 static void mesh_mpm_init_link(struct wpa_supplicant *wpa_s,
 185                                struct sta_info *sta)
 186 {
 187         u16 llid;
 188
 189         do {
 190                 if (os_get_random((u8 *) &llid, sizeof(llid)) < 0)
 191                         continue;
 192         } while (!llid || llid_in_use(wpa_s, llid));
 193
 194         sta->my_lid = llid;
 195         sta->peer_lid = 0;
 196
 197         /*
 198          * We do not use wpa_mesh_set_plink_state() here because there is no
 199          * entry in kernel yet.
 200          */
 201         sta->plink_state = PLINK_LISTEN;
 202 }
 203
 204
 205 static void mesh_mpm_send_plink_action(struct wpa_supplicant *wpa_s,
 206                                        struct sta_info *sta,
 207                                        enum plink_action_field type,
 208                                        u16 close_reason)
 209 {
 210         struct wpabuf *buf;
 211         struct hostapd_iface *ifmsh = wpa_s->ifmsh;
 212         struct hostapd_data *bss = ifmsh->bss[0];
 213         struct mesh_conf *conf = ifmsh->mconf;
 214         u8 supp_rates[2 + 2 + 32];
 215 #ifdef CONFIG_IEEE80211N
 216         u8 ht_capa_oper[2 + 26 + 2 + 22];
 217 #endif /* CONFIG_IEEE80211N */
 218         u8 *pos, *cat;
 219         u8 ie_len, add_plid = 0;
 220         int ret;
 221         int ampe = conf->security & MESH_CONF_SEC_AMPE;
 222         size_t buf_len;
 223
 224         if (!sta)
 225                 return;
 226
 227         buf_len = 2 +      /* capability info */
 228                   2 +      /* AID */
 229                   2 + 8 +  /* supported rates */
 230                   2 + (32 - 8) +
 231                   2 + 32 + /* mesh ID */
 232                   2 + 7 +  /* mesh config */
 233                   2 + 23 + /* peering management */
 234                   2 + 96 + /* AMPE */
 235                   2 + 16;  /* MIC */
 236 #ifdef CONFIG_IEEE80211N
 237         if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
 238                 buf_len += 2 + 26 + /* HT capabilities */
 239                            2 + 22;  /* HT operation */
 240         }
 241 #endif /* CONFIG_IEEE80211N */
 242         if (type != PLINK_CLOSE)
 243                 buf_len += conf->rsn_ie_len; /* RSN IE */
 244
 245         buf = wpabuf_alloc(buf_len);
 246         if (!buf)
 247                 return;
 248
 249         cat = wpabuf_mhead_u8(buf);
 250         wpabuf_put_u8(buf, WLAN_ACTION_SELF_PROTECTED);
 251         wpabuf_put_u8(buf, type);
 252
 253         if (type != PLINK_CLOSE) {
 254                 u8 info;
 255
 256                 /* capability info */
 257                 wpabuf_put_le16(buf, ampe ? IEEE80211_CAP_PRIVACY : 0);
 258
 259                 /* aid */
 260                 if (type == PLINK_CONFIRM)
 261                         wpabuf_put_le16(buf, sta->aid);
 262
 263                 /* IE: supp + ext. supp rates */
 264                 pos = hostapd_eid_supp_rates(bss, supp_rates);
 265                 pos = hostapd_eid_ext_supp_rates(bss, pos);
 266                 wpabuf_put_data(buf, supp_rates, pos - supp_rates);
 267
 268                 /* IE: RSN IE */
 269                 wpabuf_put_data(buf, conf->rsn_ie, conf->rsn_ie_len);
 270
 271                 /* IE: Mesh ID */
 272                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 273                 wpabuf_put_u8(buf, conf->meshid_len);
 274                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 275
 276                 /* IE: mesh conf */
 277                 wpabuf_put_u8(buf, WLAN_EID_MESH_CONFIG);
 278                 wpabuf_put_u8(buf, 7);
 279                 wpabuf_put_u8(buf, conf->mesh_pp_id);
 280                 wpabuf_put_u8(buf, conf->mesh_pm_id);
 281                 wpabuf_put_u8(buf, conf->mesh_cc_id);
 282                 wpabuf_put_u8(buf, conf->mesh_sp_id);
 283                 wpabuf_put_u8(buf, conf->mesh_auth_id);
 284                 info = (bss->num_plinks > 63 ? 63 : bss->num_plinks) << 1;
 285                 /* TODO: Add Connected to Mesh Gate/AS subfields */
 286                 wpabuf_put_u8(buf, info);
 287                 /* always forwarding & accepting plinks for now */
 288                 wpabuf_put_u8(buf, 0x1 | 0x8);
 289         } else {        /* Peer closing frame */
 290                 /* IE: Mesh ID */
 291                 wpabuf_put_u8(buf, WLAN_EID_MESH_ID);
 292                 wpabuf_put_u8(buf, conf->meshid_len);
 293                 wpabuf_put_data(buf, conf->meshid, conf->meshid_len);
 294         }
 295
 296         /* IE: Mesh Peering Management element */
 297         ie_len = 4;
 298         if (ampe)
 299                 ie_len += PMKID_LEN;
 300         switch (type) {
 301         case PLINK_OPEN:
 302                 break;
 303         case PLINK_CONFIRM:
 304                 ie_len += 2;
 305                 add_plid = 1;
 306                 break;
 307         case PLINK_CLOSE:
 308                 ie_len += 2;
 309                 add_plid = 1;
 310                 ie_len += 2; /* reason code */
 311                 break;
 312         }
 313
 314         wpabuf_put_u8(buf, WLAN_EID_PEER_MGMT);
 315         wpabuf_put_u8(buf, ie_len);
 316         /* peering protocol */
 317         if (ampe)
 318                 wpabuf_put_le16(buf, 1);
 319         else
 320                 wpabuf_put_le16(buf, 0);
 321         wpabuf_put_le16(buf, sta->my_lid);
 322         if (add_plid)
 323                 wpabuf_put_le16(buf, sta->peer_lid);
 324         if (type == PLINK_CLOSE)
 325                 wpabuf_put_le16(buf, close_reason);
 326         if (ampe) {
 327                 if (sta->sae == NULL) {
 328                         wpa_msg(wpa_s, MSG_INFO, "Mesh MPM: no SAE session");
 329                         goto fail;
 330                 }
 331                 mesh_rsn_get_pmkid(wpa_s->mesh_rsn, sta,
 332                                    wpabuf_put(buf, PMKID_LEN));
 333         }
 334
 335 #ifdef CONFIG_IEEE80211N
 336         if (type != PLINK_CLOSE && wpa_s->mesh_ht_enabled) {
 337                 pos = hostapd_eid_ht_capabilities(bss, ht_capa_oper);
 338                 pos = hostapd_eid_ht_operation(bss, pos);
 339                 wpabuf_put_data(buf, ht_capa_oper, pos - ht_capa_oper);
 340         }
 341 #endif /* CONFIG_IEEE80211N */
 342
 343         if (ampe && mesh_rsn_protect_frame(wpa_s->mesh_rsn, sta, cat, buf)) {
 344                 wpa_msg(wpa_s, MSG_INFO,
 345                         "Mesh MPM: failed to add AMPE and MIC IE");
 346                 goto fail;
 347         }
 348
 349         ret = wpa_drv_send_action(wpa_s, wpa_s->assoc_freq, 0,
 350                                   sta->addr, wpa_s->own_addr, wpa_s->own_addr,
 351                                   wpabuf_head(buf), wpabuf_len(buf), 0);
 352         if (ret < 0)
 353                 wpa_msg(wpa_s, MSG_INFO,
 354                         "Mesh MPM: failed to send peering frame");
 355
 356 fail:
 357         wpabuf_free(buf);
 358 }
 359
 360
 361 /* configure peering state in ours and driver's station entry */
 362 void wpa_mesh_set_plink_state(struct wpa_supplicant *wpa_s,
 363                               struct sta_info *sta,
 364                               enum mesh_plink_state state)
 365 {
 366         struct hostapd_sta_add_params params;
 367         int ret;
 368
 369         sta->plink_state = state;
 370
 371         os_memset(&params, 0, sizeof(params));
 372         params.addr = sta->addr;
 373         params.plink_state = state;
 374         params.set = 1;
 375
 376         wpa_msg(wpa_s, MSG_DEBUG, "MPM set " MACSTR " into %s",
 377                 MAC2STR(sta->addr), mplstate[state]);
 378         ret = wpa_drv_sta_add(wpa_s, &params);
 379         if (ret) {
 380                 wpa_msg(wpa_s, MSG_ERROR, "Driver failed to set " MACSTR
 381                         ": %d", MAC2STR(sta->addr), ret);
 382         }
 383 }
 384
 385
 386 static void mesh_mpm_fsm_restart(struct wpa_supplicant *wpa_s,
 387                                  struct sta_info *sta)
 388 {
 389         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 390
 391         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 392
 393         ap_free_sta(hapd, sta);
 394 }
 395
 396
 397 static void plink_timer(void *eloop_ctx, void *user_data)
 398 {
 399         struct wpa_supplicant *wpa_s = eloop_ctx;
 400         struct sta_info *sta = user_data;
 401         u16 reason = 0;
 402         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 403
 404         switch (sta->plink_state) {
 405         case PLINK_OPEN_RCVD:
 406         case PLINK_OPEN_SENT:
 407                 /* retry timer */
 408                 if (sta->mpm_retries < conf->dot11MeshMaxRetries) {
 409                         eloop_register_timeout(
 410                                 conf->dot11MeshRetryTimeout / 1000,
 411                                 (conf->dot11MeshRetryTimeout % 1000) * 1000,
 412                                 plink_timer, wpa_s, sta);
 413                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 414                         sta->mpm_retries++;
 415                         break;
 416                 }
 417                 reason = WLAN_REASON_MESH_MAX_RETRIES;
 418                 /* fall through on else */
 419
 420         case PLINK_CNF_RCVD:
 421                 /* confirm timer */
 422                 if (!reason)
 423                         reason = WLAN_REASON_MESH_CONFIRM_TIMEOUT;
 424                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 425                 eloop_register_timeout(conf->dot11MeshHoldingTimeout / 1000,
 426                         (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 427                         plink_timer, wpa_s, sta);
 428                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 429                 break;
 430         case PLINK_HOLDING:
 431                 /* holding timer */
 432                 mesh_mpm_fsm_restart(wpa_s, sta);
 433                 break;
 434         default:
 435                 break;
 436         }
 437 }
 438
 439
 440 /* initiate peering with station */
 441 static void
 442 mesh_mpm_plink_open(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 443                     enum mesh_plink_state next_state)
 444 {
 445         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 446
 447         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 448         eloop_register_timeout(conf->dot11MeshRetryTimeout / 1000,
 449                                (conf->dot11MeshRetryTimeout % 1000) * 1000,
 450                                plink_timer, wpa_s, sta);
 451         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_OPEN, 0);
 452         wpa_mesh_set_plink_state(wpa_s, sta, next_state);
 453 }
 454
 455
 456 int mesh_mpm_plink_close(struct hostapd_data *hapd,
 457                          struct sta_info *sta, void *ctx)
 458 {
 459         struct wpa_supplicant *wpa_s = ctx;
 460         int reason = WLAN_REASON_MESH_PEERING_CANCELLED;
 461
 462         if (sta) {
 463                 wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 464                 mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CLOSE, reason);
 465                 wpa_printf(MSG_DEBUG, "MPM closing plink sta=" MACSTR,
 466                            MAC2STR(sta->addr));
 467                 eloop_cancel_timeout(plink_timer, wpa_s, sta);
 468                 return 0;
 469         }
 470
 471         return 1;
 472 }
 473
 474
 475 void mesh_mpm_deinit(struct wpa_supplicant *wpa_s, struct hostapd_iface *ifmsh)
 476 {
 477         struct hostapd_data *hapd = ifmsh->bss[0];
 478
 479         /* notify peers we're leaving */
 480         ap_for_each_sta(hapd, mesh_mpm_plink_close, wpa_s);
 481
 482         hapd->num_plinks = 0;
 483         hostapd_free_stas(hapd);
 484 }
 485
 486
 487 /* for mesh_rsn to indicate this peer has completed authentication, and we're
 488  * ready to start AMPE */
 489 void mesh_mpm_auth_peer(struct wpa_supplicant *wpa_s, const u8 *addr)
 490 {
 491         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 492         struct hostapd_sta_add_params params;
 493         struct sta_info *sta;
 494         int ret;
 495
 496         sta = ap_get_sta(data, addr);
 497         if (!sta) {
 498                 wpa_msg(wpa_s, MSG_DEBUG, "no such mesh peer");
 499                 return;
 500         }
 501
 502         /* TODO: Should do nothing if this STA is already authenticated, but
 503          * the AP code already sets this flag. */
 504         sta->flags |= WLAN_STA_AUTH;
 505
 506         mesh_rsn_init_ampe_sta(wpa_s, sta);
 507
 508         os_memset(&params, 0, sizeof(params));
 509         params.addr = sta->addr;
 510         params.flags = WPA_STA_AUTHENTICATED | WPA_STA_AUTHORIZED;
 511         params.set = 1;
 512
 513         wpa_msg(wpa_s, MSG_DEBUG, "MPM authenticating " MACSTR,
 514                 MAC2STR(sta->addr));
 515         ret = wpa_drv_sta_add(wpa_s, &params);
 516         if (ret) {
 517                 wpa_msg(wpa_s, MSG_ERROR,
 518                         "Driver failed to set " MACSTR ": %d",
 519                         MAC2STR(sta->addr), ret);
 520         }
 521
 522         if (!sta->my_lid)
 523                 mesh_mpm_init_link(wpa_s, sta);
 524
 525         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 526 }
 527
 528 /*
 529  * Initialize a sta_info structure for a peer and upload it into the driver
 530  * in preparation for beginning authentication or peering. This is done when a
 531  * Beacon (secure or open mesh) or a peering open frame (for open mesh) is
 532  * received from the peer for the first time.
 533  */
 534 static struct sta_info * mesh_mpm_add_peer(struct wpa_supplicant *wpa_s,
 535                                            const u8 *addr,
 536                                            struct ieee802_11_elems *elems)
 537 {
 538         struct hostapd_sta_add_params params;
 539         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 540         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 541         struct sta_info *sta;
 542         int ret;
 543
 544         sta = ap_get_sta(data, addr);
 545         if (!sta) {
 546                 sta = ap_sta_add(data, addr);
 547                 if (!sta)
 548                         return NULL;
 549         }
 550
 551         /* Set WMM by default since Mesh STAs are QoS STAs */
 552         sta->flags |= WLAN_STA_WMM;
 553
 554         /* initialize sta */
 555         if (copy_supp_rates(wpa_s, sta, elems)) {
 556                 ap_free_sta(data, sta);
 557                 return NULL;
 558         }
 559
 560         mesh_mpm_init_link(wpa_s, sta);
 561
 562 #ifdef CONFIG_IEEE80211N
 563         copy_sta_ht_capab(data, sta, elems->ht_capabilities);
 564         update_ht_state(data, sta);
 565 #endif /* CONFIG_IEEE80211N */
 566
 567         if (hostapd_get_aid(data, sta) < 0) {
 568                 wpa_msg(wpa_s, MSG_ERROR, "No AIDs available");
 569                 ap_free_sta(data, sta);
 570                 return NULL;
 571         }
 572
 573         /* insert into driver */
 574         os_memset(&params, 0, sizeof(params));
 575         params.supp_rates = sta->supported_rates;
 576         params.supp_rates_len = sta->supported_rates_len;
 577         params.addr = addr;
 578         params.plink_state = sta->plink_state;
 579         params.aid = sta->aid;
 580         params.listen_interval = 100;
 581         params.ht_capabilities = sta->ht_capabilities;
 582         params.flags |= WPA_STA_WMM;
 583         params.flags_mask |= WPA_STA_AUTHENTICATED;
 584         if (conf->security == MESH_CONF_SEC_NONE) {
 585                 params.flags |= WPA_STA_AUTHORIZED;
 586                 params.flags |= WPA_STA_AUTHENTICATED;
 587         } else {
 588                 sta->flags |= WLAN_STA_MFP;
 589                 params.flags |= WPA_STA_MFP;
 590         }
 591
 592         ret = wpa_drv_sta_add(wpa_s, &params);
 593         if (ret) {
 594                 wpa_msg(wpa_s, MSG_ERROR,
 595                         "Driver failed to insert " MACSTR ": %d",
 596                         MAC2STR(addr), ret);
 597                 ap_free_sta(data, sta);
 598                 return NULL;
 599         }
 600
 601         return sta;
 602 }
 603
 604
 605 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 606                             struct ieee802_11_elems *elems)
 607 {
 608         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 609         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 610         struct sta_info *sta;
 611         struct wpa_ssid *ssid = wpa_s->current_ssid;
 612
 613         sta = mesh_mpm_add_peer(wpa_s, addr, elems);
 614         if (!sta)
 615                 return;
 616
 617         if (ssid && ssid->no_auto_peer) {
 618                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 619                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 620                 if (data->mesh_pending_auth) {
 621                         struct os_reltime age;
 622                         const struct ieee80211_mgmt *mgmt;
 623                         struct hostapd_frame_info fi;
 624
 625                         mgmt = wpabuf_head(data->mesh_pending_auth);
 626                         os_reltime_age(&data->mesh_pending_auth_time, &age);
 627                         if (age.sec < 2 &&
 628                             os_memcmp(mgmt->sa, addr, ETH_ALEN) == 0) {
 629                                 wpa_printf(MSG_DEBUG,
 630                                            "mesh: Process pending Authentication frame from %u.%06u seconds ago",
 631                                            (unsigned int) age.sec,
 632                                            (unsigned int) age.usec);
 633                                 os_memset(&fi, 0, sizeof(fi));
 634                                 ieee802_11_mgmt(
 635                                         data,
 636                                         wpabuf_head(data->mesh_pending_auth),
 637                                         wpabuf_len(data->mesh_pending_auth),
 638                                         &fi);
 639                         }
 640                         wpabuf_free(data->mesh_pending_auth);
 641                         data->mesh_pending_auth = NULL;
 642                 }
 643                 return;
 644         }
 645
 646         if (conf->security == MESH_CONF_SEC_NONE)
 647                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 648         else
 649                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 650 }
 651
 652
 653 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 654 {
 655         struct hostapd_frame_info fi;
 656
 657         os_memset(&fi, 0, sizeof(fi));
 658         fi.datarate = rx_mgmt->datarate;
 659         fi.ssi_signal = rx_mgmt->ssi_signal;
 660         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 661                         rx_mgmt->frame_len, &fi);
 662 }
 663
 664
 665 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 666                                  struct sta_info *sta)
 667 {
 668         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 669         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 670         u8 seq[6] = {};
 671
 672         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 673                 MAC2STR(sta->addr));
 674
 675         if (conf->security & MESH_CONF_SEC_AMPE) {
 676                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 677                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 678                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 679                                 seq, sizeof(seq),
 680                                 sta->mgtk, sizeof(sta->mgtk));
 681                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 682                                 seq, sizeof(seq),
 683                                 sta->mgtk, sizeof(sta->mgtk));
 684
 685                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 686                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 687                                 sta->mgtk, sizeof(sta->mgtk));
 688         }
 689
 690         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 691         hapd->num_plinks++;
 692
 693         sta->flags |= WLAN_STA_ASSOC;
 694
 695         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 696
 697         /* Send ctrl event */
 698         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 699                      MAC2STR(sta->addr));
 700 }
 701
 702
 703 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 704                          enum plink_event event)
 705 {
 706         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 707         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 708         u16 reason = 0;
 709
 710         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 711                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 712                 mplevent[event]);
 713
 714         switch (sta->plink_state) {
 715         case PLINK_LISTEN:
 716                 switch (event) {
 717                 case CLS_ACPT:
 718                         mesh_mpm_fsm_restart(wpa_s, sta);
 719                         break;
 720                 case OPN_ACPT:
 721                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 722                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 723                                                    0);
 724                         break;
 725                 default:
 726                         break;
 727                 }
 728                 break;
 729         case PLINK_OPEN_SENT:
 730                 switch (event) {
 731                 case OPN_RJCT:
 732                 case CNF_RJCT:
 733                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 734                         /* fall-through */
 735                 case CLS_ACPT:
 736                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 737                         if (!reason)
 738                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 739                         eloop_register_timeout(
 740                                 conf->dot11MeshHoldingTimeout / 1000,
 741                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 742                                 plink_timer, wpa_s, sta);
 743                         mesh_mpm_send_plink_action(wpa_s, sta,
 744                                                    PLINK_CLOSE, reason);
 745                         break;
 746                 case OPN_ACPT:
 747                         /* retry timer is left untouched */
 748                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 749                         mesh_mpm_send_plink_action(wpa_s, sta,
 750                                                    PLINK_CONFIRM, 0);
 751                         break;
 752                 case CNF_ACPT:
 753                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 754                         eloop_register_timeout(
 755                                 conf->dot11MeshConfirmTimeout / 1000,
 756                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 757                                 plink_timer, wpa_s, sta);
 758                         break;
 759                 default:
 760                         break;
 761                 }
 762                 break;
 763         case PLINK_OPEN_RCVD:
 764                 switch (event) {
 765                 case OPN_RJCT:
 766                 case CNF_RJCT:
 767                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 768                         /* fall-through */
 769                 case CLS_ACPT:
 770                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 771                         if (!reason)
 772                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 773                         eloop_register_timeout(
 774                                 conf->dot11MeshHoldingTimeout / 1000,
 775                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 776                                 plink_timer, wpa_s, sta);
 777                         sta->mpm_close_reason = reason;
 778                         mesh_mpm_send_plink_action(wpa_s, sta,
 779                                                    PLINK_CLOSE, reason);
 780                         break;
 781                 case OPN_ACPT:
 782                         mesh_mpm_send_plink_action(wpa_s, sta,
 783                                                    PLINK_CONFIRM, 0);
 784                         break;
 785                 case CNF_ACPT:
 786                         if (conf->security & MESH_CONF_SEC_AMPE)
 787                                 mesh_rsn_derive_mtk(wpa_s, sta);
 788                         mesh_mpm_plink_estab(wpa_s, sta);
 789                         break;
 790                 default:
 791                         break;
 792                 }
 793                 break;
 794         case PLINK_CNF_RCVD:
 795                 switch (event) {
 796                 case OPN_RJCT:
 797                 case CNF_RJCT:
 798                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 799                         /* fall-through */
 800                 case CLS_ACPT:
 801                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 802                         if (!reason)
 803                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 804                         eloop_register_timeout(
 805                                 conf->dot11MeshHoldingTimeout / 1000,
 806                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 807                                 plink_timer, wpa_s, sta);
 808                         sta->mpm_close_reason = reason;
 809                         mesh_mpm_send_plink_action(wpa_s, sta,
 810                                                    PLINK_CLOSE, reason);
 811                         break;
 812                 case OPN_ACPT:
 813                         mesh_mpm_plink_estab(wpa_s, sta);
 814                         mesh_mpm_send_plink_action(wpa_s, sta,
 815                                                    PLINK_CONFIRM, 0);
 816                         break;
 817                 default:
 818                         break;
 819                 }
 820                 break;
 821         case PLINK_ESTAB:
 822                 switch (event) {
 823                 case CLS_ACPT:
 824                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 825                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 826
 827                         eloop_register_timeout(
 828                                 conf->dot11MeshHoldingTimeout / 1000,
 829                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 830                                 plink_timer, wpa_s, sta);
 831                         sta->mpm_close_reason = reason;
 832
 833                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 834                                 " closed with reason %d",
 835                                 MAC2STR(sta->addr), reason);
 836
 837                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 838                                      MESH_PEER_DISCONNECTED MACSTR,
 839                                      MAC2STR(sta->addr));
 840
 841                         hapd->num_plinks--;
 842
 843                         mesh_mpm_send_plink_action(wpa_s, sta,
 844                                                    PLINK_CLOSE, reason);
 845                         break;
 846                 case OPN_ACPT:
 847                         mesh_mpm_send_plink_action(wpa_s, sta,
 848                                                    PLINK_CONFIRM, 0);
 849                         break;
 850                 default:
 851                         break;
 852                 }
 853                 break;
 854         case PLINK_HOLDING:
 855                 switch (event) {
 856                 case CLS_ACPT:
 857                         mesh_mpm_fsm_restart(wpa_s, sta);
 858                         break;
 859                 case OPN_ACPT:
 860                 case CNF_ACPT:
 861                 case OPN_RJCT:
 862                 case CNF_RJCT:
 863                         reason = sta->mpm_close_reason;
 864                         mesh_mpm_send_plink_action(wpa_s, sta,
 865                                                    PLINK_CLOSE, reason);
 866                         break;
 867                 default:
 868                         break;
 869                 }
 870                 break;
 871         default:
 872                 wpa_msg(wpa_s, MSG_DEBUG,
 873                         "Unsupported MPM event %s for state %s",
 874                         mplevent[event], mplstate[sta->plink_state]);
 875                 break;
 876         }
 877 }
 878
 879
 880 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 881                         const struct ieee80211_mgmt *mgmt, size_t len)
 882 {
 883         u8 action_field;
 884         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 885         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 886         struct sta_info *sta;
 887         u16 plid = 0, llid = 0;
 888         enum plink_event event;
 889         struct ieee802_11_elems elems;
 890         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 891         const u8 *ies;
 892         size_t ie_len;
 893         int ret;
 894
 895         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 896                 return;
 897
 898         action_field = mgmt->u.action.u.slf_prot_action.action;
 899         if (action_field != PLINK_OPEN &&
 900             action_field != PLINK_CONFIRM &&
 901             action_field != PLINK_CLOSE)
 902                 return;
 903
 904         ies = mgmt->u.action.u.slf_prot_action.variable;
 905         ie_len = (const u8 *) mgmt + len -
 906                 mgmt->u.action.u.slf_prot_action.variable;
 907
 908         /* at least expect mesh id and peering mgmt */
 909         if (ie_len < 2 + 2) {
 910                 wpa_printf(MSG_DEBUG,
 911                            "MPM: Ignore too short action frame %u ie_len %u",
 912                            action_field, (unsigned int) ie_len);
 913                 return;
 914         }
 915         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
 916
 917         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 918                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
 919                            WPA_GET_LE16(ies));
 920                 ies += 2;       /* capability */
 921                 ie_len -= 2;
 922         }
 923         if (action_field == PLINK_CONFIRM) {
 924                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
 925                 ies += 2;       /* aid */
 926                 ie_len -= 2;
 927         }
 928
 929         /* check for mesh peering, mesh id and mesh config IEs */
 930         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 931                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
 932                 return;
 933         }
 934         if (!elems.peer_mgmt) {
 935                 wpa_printf(MSG_DEBUG,
 936                            "MPM: No Mesh Peering Management element");
 937                 return;
 938         }
 939         if (action_field != PLINK_CLOSE) {
 940                 if (!elems.mesh_id || !elems.mesh_config) {
 941                         wpa_printf(MSG_DEBUG,
 942                                    "MPM: No Mesh ID or Mesh Configuration element");
 943                         return;
 944                 }
 945
 946                 if (!matches_local(wpa_s, &elems)) {
 947                         wpa_printf(MSG_DEBUG,
 948                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
 949                         return;
 950                 }
 951         }
 952
 953         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 954                                        elems.peer_mgmt,
 955                                        elems.peer_mgmt_len,
 956                                        &peer_mgmt_ie);
 957         if (ret) {
 958                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
 959                 return;
 960         }
 961
 962         /* the sender's llid is our plid and vice-versa */
 963         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 964         if (peer_mgmt_ie.plid)
 965                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 966         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
 967
 968         sta = ap_get_sta(hapd, mgmt->sa);
 969
 970         /*
 971          * If this is an open frame from an unknown STA, and this is an
 972          * open mesh, then go ahead and add the peer before proceeding.
 973          */
 974         if (!sta && action_field == PLINK_OPEN &&
 975             !(mconf->security & MESH_CONF_SEC_AMPE))
 976                 sta = mesh_mpm_add_peer(wpa_s, mgmt->sa, &elems);
 977
 978         if (!sta) {
 979                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
 980                 return;
 981         }
 982
 983 #ifdef CONFIG_SAE
 984         /* peer is in sae_accepted? */
 985         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
 986                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
 987                 return;
 988         }
 989 #endif /* CONFIG_SAE */
 990
 991         if (!sta->my_lid)
 992                 mesh_mpm_init_link(wpa_s, sta);
 993
 994         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
 995             mesh_rsn_process_ampe(wpa_s, sta, &elems,
 996                                   &mgmt->u.action.category,
 997                                   ies, ie_len)) {
 998                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
 999                 return;
1000         }
1001
1002         if (sta->plink_state == PLINK_BLOCKED) {
1003                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
1004                 return;
1005         }
1006
1007         /* Now we will figure out the appropriate event... */
1008         switch (action_field) {
1009         case PLINK_OPEN:
1010                 if (plink_free_count(hapd) == 0) {
1011                         event = OPN_IGNR;
1012                         wpa_printf(MSG_INFO,
1013                                    "MPM: Peer link num over quota(%d)",
1014                                    hapd->max_plinks);
1015                 } else if (sta->peer_lid && sta->peer_lid != plid) {
1016                         event = OPN_IGNR;
1017                 } else {
1018                         sta->peer_lid = plid;
1019                         event = OPN_ACPT;
1020                 }
1021                 break;
1022         case PLINK_CONFIRM:
1023                 if (plink_free_count(hapd) == 0) {
1024                         event = CNF_IGNR;
1025                         wpa_printf(MSG_INFO,
1026                                    "MPM: Peer link num over quota(%d)",
1027                                    hapd->max_plinks);
1028                 } else if (sta->my_lid != llid ||
1029                            (sta->peer_lid && sta->peer_lid != plid)) {
1030                         event = CNF_IGNR;
1031                 } else {
1032                         if (!sta->peer_lid)
1033                                 sta->peer_lid = plid;
1034                         event = CNF_ACPT;
1035                 }
1036                 break;
1037         case PLINK_CLOSE:
1038                 if (sta->plink_state == PLINK_ESTAB)
1039                         /* Do not check for llid or plid. This does not
1040                          * follow the standard but since multiple plinks
1041                          * per cand are not supported, it is necessary in
1042                          * order to avoid a livelock when MP A sees an
1043                          * establish peer link to MP B but MP B does not
1044                          * see it. This can be caused by a timeout in
1045                          * B's peer link establishment or B being
1046                          * restarted.
1047                          */
1048                         event = CLS_ACPT;
1049                 else if (sta->peer_lid != plid)
1050                         event = CLS_IGNR;
1051                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
1052                         event = CLS_IGNR;
1053                 else
1054                         event = CLS_ACPT;
1055                 break;
1056         default:
1057                 /*
1058                  * This cannot be hit due to the action_field check above, but
1059                  * compilers may not be able to figure that out and can warn
1060                  * about uninitialized event below.
1061                  */
1062                 return;
1063         }
1064         mesh_mpm_fsm(wpa_s, sta, event);
1065 }
1066
1067
1068 /* called by ap_free_sta */
1069 void mesh_mpm_free_sta(struct sta_info *sta)
1070 {
1071         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1072         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1073 }