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