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                         elems->ht_capabilities_len);
 556         update_ht_state(data, sta);
 557 #endif /* CONFIG_IEEE80211N */
 558
 559         /* insert into driver */
 560         os_memset(&params, 0, sizeof(params));
 561         params.supp_rates = sta->supported_rates;
 562         params.supp_rates_len = sta->supported_rates_len;
 563         params.addr = addr;
 564         params.plink_state = sta->plink_state;
 565         params.aid = sta->peer_lid;
 566         params.listen_interval = 100;
 567         params.ht_capabilities = sta->ht_capabilities;
 568         params.flags |= WPA_STA_WMM;
 569         params.flags_mask |= WPA_STA_AUTHENTICATED;
 570         if (conf->security == MESH_CONF_SEC_NONE) {
 571                 params.flags |= WPA_STA_AUTHORIZED;
 572                 params.flags |= WPA_STA_AUTHENTICATED;
 573         } else {
 574                 sta->flags |= WLAN_STA_MFP;
 575                 params.flags |= WPA_STA_MFP;
 576         }
 577
 578         ret = wpa_drv_sta_add(wpa_s, &params);
 579         if (ret) {
 580                 wpa_msg(wpa_s, MSG_ERROR,
 581                         "Driver failed to insert " MACSTR ": %d",
 582                         MAC2STR(addr), ret);
 583                 ap_free_sta(data, sta);
 584                 return NULL;
 585         }
 586
 587         return sta;
 588 }
 589
 590
 591 void wpa_mesh_new_mesh_peer(struct wpa_supplicant *wpa_s, const u8 *addr,
 592                             struct ieee802_11_elems *elems)
 593 {
 594         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 595         struct hostapd_data *data = wpa_s->ifmsh->bss[0];
 596         struct sta_info *sta;
 597         struct wpa_ssid *ssid = wpa_s->current_ssid;
 598
 599         sta = mesh_mpm_add_peer(wpa_s, addr, elems);
 600         if (!sta)
 601                 return;
 602
 603         if (ssid && ssid->no_auto_peer) {
 604                 wpa_msg(wpa_s, MSG_INFO, "will not initiate new peer link with "
 605                         MACSTR " because of no_auto_peer", MAC2STR(addr));
 606                 if (data->mesh_pending_auth) {
 607                         struct os_reltime age;
 608                         const struct ieee80211_mgmt *mgmt;
 609                         struct hostapd_frame_info fi;
 610
 611                         mgmt = wpabuf_head(data->mesh_pending_auth);
 612                         os_reltime_age(&data->mesh_pending_auth_time, &age);
 613                         if (age.sec < 2 &&
 614                             os_memcmp(mgmt->sa, addr, ETH_ALEN) == 0) {
 615                                 wpa_printf(MSG_DEBUG,
 616                                            "mesh: Process pending Authentication frame from %u.%06u seconds ago",
 617                                            (unsigned int) age.sec,
 618                                            (unsigned int) age.usec);
 619                                 os_memset(&fi, 0, sizeof(fi));
 620                                 ieee802_11_mgmt(
 621                                         data,
 622                                         wpabuf_head(data->mesh_pending_auth),
 623                                         wpabuf_len(data->mesh_pending_auth),
 624                                         &fi);
 625                         }
 626                         wpabuf_free(data->mesh_pending_auth);
 627                         data->mesh_pending_auth = NULL;
 628                 }
 629                 return;
 630         }
 631
 632         if (conf->security == MESH_CONF_SEC_NONE)
 633                 mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_SENT);
 634         else
 635                 mesh_rsn_auth_sae_sta(wpa_s, sta);
 636 }
 637
 638
 639 void mesh_mpm_mgmt_rx(struct wpa_supplicant *wpa_s, struct rx_mgmt *rx_mgmt)
 640 {
 641         struct hostapd_frame_info fi;
 642
 643         os_memset(&fi, 0, sizeof(fi));
 644         fi.datarate = rx_mgmt->datarate;
 645         fi.ssi_signal = rx_mgmt->ssi_signal;
 646         ieee802_11_mgmt(wpa_s->ifmsh->bss[0], rx_mgmt->frame,
 647                         rx_mgmt->frame_len, &fi);
 648 }
 649
 650
 651 static void mesh_mpm_plink_estab(struct wpa_supplicant *wpa_s,
 652                                  struct sta_info *sta)
 653 {
 654         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 655         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 656         u8 seq[6] = {};
 657
 658         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR " established",
 659                 MAC2STR(sta->addr));
 660
 661         if (conf->security & MESH_CONF_SEC_AMPE) {
 662                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 0, 0,
 663                                 seq, sizeof(seq), sta->mtk, sizeof(sta->mtk));
 664                 wpa_drv_set_key(wpa_s, WPA_ALG_CCMP, sta->addr, 1, 0,
 665                                 seq, sizeof(seq),
 666                                 sta->mgtk, sizeof(sta->mgtk));
 667                 wpa_drv_set_key(wpa_s, WPA_ALG_IGTK, sta->addr, 4, 0,
 668                                 seq, sizeof(seq),
 669                                 sta->mgtk, sizeof(sta->mgtk));
 670
 671                 wpa_hexdump_key(MSG_DEBUG, "mtk:", sta->mtk, sizeof(sta->mtk));
 672                 wpa_hexdump_key(MSG_DEBUG, "mgtk:",
 673                                 sta->mgtk, sizeof(sta->mgtk));
 674         }
 675
 676         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_ESTAB);
 677         hapd->num_plinks++;
 678
 679         sta->flags |= WLAN_STA_ASSOC;
 680
 681         eloop_cancel_timeout(plink_timer, wpa_s, sta);
 682
 683         /* Send ctrl event */
 684         wpa_msg_ctrl(wpa_s, MSG_INFO, MESH_PEER_CONNECTED MACSTR,
 685                      MAC2STR(sta->addr));
 686 }
 687
 688
 689 static void mesh_mpm_fsm(struct wpa_supplicant *wpa_s, struct sta_info *sta,
 690                          enum plink_event event)
 691 {
 692         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 693         struct mesh_conf *conf = wpa_s->ifmsh->mconf;
 694         u16 reason = 0;
 695
 696         wpa_msg(wpa_s, MSG_DEBUG, "MPM " MACSTR " state %s event %s",
 697                 MAC2STR(sta->addr), mplstate[sta->plink_state],
 698                 mplevent[event]);
 699
 700         switch (sta->plink_state) {
 701         case PLINK_LISTEN:
 702                 switch (event) {
 703                 case CLS_ACPT:
 704                         mesh_mpm_fsm_restart(wpa_s, sta);
 705                         break;
 706                 case OPN_ACPT:
 707                         mesh_mpm_plink_open(wpa_s, sta, PLINK_OPEN_RCVD);
 708                         mesh_mpm_send_plink_action(wpa_s, sta, PLINK_CONFIRM,
 709                                                    0);
 710                         break;
 711                 default:
 712                         break;
 713                 }
 714                 break;
 715         case PLINK_OPEN_SENT:
 716                 switch (event) {
 717                 case OPN_RJCT:
 718                 case CNF_RJCT:
 719                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 720                         /* fall-through */
 721                 case CLS_ACPT:
 722                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 723                         if (!reason)
 724                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 725                         eloop_register_timeout(
 726                                 conf->dot11MeshHoldingTimeout / 1000,
 727                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 728                                 plink_timer, wpa_s, sta);
 729                         mesh_mpm_send_plink_action(wpa_s, sta,
 730                                                    PLINK_CLOSE, reason);
 731                         break;
 732                 case OPN_ACPT:
 733                         /* retry timer is left untouched */
 734                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_OPEN_RCVD);
 735                         mesh_mpm_send_plink_action(wpa_s, sta,
 736                                                    PLINK_CONFIRM, 0);
 737                         break;
 738                 case CNF_ACPT:
 739                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_CNF_RCVD);
 740                         eloop_register_timeout(
 741                                 conf->dot11MeshConfirmTimeout / 1000,
 742                                 (conf->dot11MeshConfirmTimeout % 1000) * 1000,
 743                                 plink_timer, wpa_s, sta);
 744                         break;
 745                 default:
 746                         break;
 747                 }
 748                 break;
 749         case PLINK_OPEN_RCVD:
 750                 switch (event) {
 751                 case OPN_RJCT:
 752                 case CNF_RJCT:
 753                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 754                         /* fall-through */
 755                 case CLS_ACPT:
 756                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 757                         if (!reason)
 758                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 759                         eloop_register_timeout(
 760                                 conf->dot11MeshHoldingTimeout / 1000,
 761                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 762                                 plink_timer, wpa_s, sta);
 763                         sta->mpm_close_reason = reason;
 764                         mesh_mpm_send_plink_action(wpa_s, sta,
 765                                                    PLINK_CLOSE, reason);
 766                         break;
 767                 case OPN_ACPT:
 768                         mesh_mpm_send_plink_action(wpa_s, sta,
 769                                                    PLINK_CONFIRM, 0);
 770                         break;
 771                 case CNF_ACPT:
 772                         if (conf->security & MESH_CONF_SEC_AMPE)
 773                                 mesh_rsn_derive_mtk(wpa_s, sta);
 774                         mesh_mpm_plink_estab(wpa_s, sta);
 775                         break;
 776                 default:
 777                         break;
 778                 }
 779                 break;
 780         case PLINK_CNF_RCVD:
 781                 switch (event) {
 782                 case OPN_RJCT:
 783                 case CNF_RJCT:
 784                         reason = WLAN_REASON_MESH_CONFIG_POLICY_VIOLATION;
 785                         /* fall-through */
 786                 case CLS_ACPT:
 787                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 788                         if (!reason)
 789                                 reason = WLAN_REASON_MESH_CLOSE_RCVD;
 790                         eloop_register_timeout(
 791                                 conf->dot11MeshHoldingTimeout / 1000,
 792                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 793                                 plink_timer, wpa_s, sta);
 794                         sta->mpm_close_reason = reason;
 795                         mesh_mpm_send_plink_action(wpa_s, sta,
 796                                                    PLINK_CLOSE, reason);
 797                         break;
 798                 case OPN_ACPT:
 799                         mesh_mpm_plink_estab(wpa_s, sta);
 800                         mesh_mpm_send_plink_action(wpa_s, sta,
 801                                                    PLINK_CONFIRM, 0);
 802                         break;
 803                 default:
 804                         break;
 805                 }
 806                 break;
 807         case PLINK_ESTAB:
 808                 switch (event) {
 809                 case CLS_ACPT:
 810                         wpa_mesh_set_plink_state(wpa_s, sta, PLINK_HOLDING);
 811                         reason = WLAN_REASON_MESH_CLOSE_RCVD;
 812
 813                         eloop_register_timeout(
 814                                 conf->dot11MeshHoldingTimeout / 1000,
 815                                 (conf->dot11MeshHoldingTimeout % 1000) * 1000,
 816                                 plink_timer, wpa_s, sta);
 817                         sta->mpm_close_reason = reason;
 818
 819                         wpa_msg(wpa_s, MSG_INFO, "mesh plink with " MACSTR
 820                                 " closed with reason %d",
 821                                 MAC2STR(sta->addr), reason);
 822
 823                         wpa_msg_ctrl(wpa_s, MSG_INFO,
 824                                      MESH_PEER_DISCONNECTED MACSTR,
 825                                      MAC2STR(sta->addr));
 826
 827                         hapd->num_plinks--;
 828
 829                         mesh_mpm_send_plink_action(wpa_s, sta,
 830                                                    PLINK_CLOSE, reason);
 831                         break;
 832                 case OPN_ACPT:
 833                         mesh_mpm_send_plink_action(wpa_s, sta,
 834                                                    PLINK_CONFIRM, 0);
 835                         break;
 836                 default:
 837                         break;
 838                 }
 839                 break;
 840         case PLINK_HOLDING:
 841                 switch (event) {
 842                 case CLS_ACPT:
 843                         mesh_mpm_fsm_restart(wpa_s, sta);
 844                         break;
 845                 case OPN_ACPT:
 846                 case CNF_ACPT:
 847                 case OPN_RJCT:
 848                 case CNF_RJCT:
 849                         reason = sta->mpm_close_reason;
 850                         mesh_mpm_send_plink_action(wpa_s, sta,
 851                                                    PLINK_CLOSE, reason);
 852                         break;
 853                 default:
 854                         break;
 855                 }
 856                 break;
 857         default:
 858                 wpa_msg(wpa_s, MSG_DEBUG,
 859                         "Unsupported MPM event %s for state %s",
 860                         mplevent[event], mplstate[sta->plink_state]);
 861                 break;
 862         }
 863 }
 864
 865
 866 void mesh_mpm_action_rx(struct wpa_supplicant *wpa_s,
 867                         const struct ieee80211_mgmt *mgmt, size_t len)
 868 {
 869         u8 action_field;
 870         struct hostapd_data *hapd = wpa_s->ifmsh->bss[0];
 871         struct mesh_conf *mconf = wpa_s->ifmsh->mconf;
 872         struct sta_info *sta;
 873         u16 plid = 0, llid = 0;
 874         enum plink_event event;
 875         struct ieee802_11_elems elems;
 876         struct mesh_peer_mgmt_ie peer_mgmt_ie;
 877         const u8 *ies;
 878         size_t ie_len;
 879         int ret;
 880
 881         if (mgmt->u.action.category != WLAN_ACTION_SELF_PROTECTED)
 882                 return;
 883
 884         action_field = mgmt->u.action.u.slf_prot_action.action;
 885         if (action_field != PLINK_OPEN &&
 886             action_field != PLINK_CONFIRM &&
 887             action_field != PLINK_CLOSE)
 888                 return;
 889
 890         ies = mgmt->u.action.u.slf_prot_action.variable;
 891         ie_len = (const u8 *) mgmt + len -
 892                 mgmt->u.action.u.slf_prot_action.variable;
 893
 894         /* at least expect mesh id and peering mgmt */
 895         if (ie_len < 2 + 2) {
 896                 wpa_printf(MSG_DEBUG,
 897                            "MPM: Ignore too short action frame %u ie_len %u",
 898                            action_field, (unsigned int) ie_len);
 899                 return;
 900         }
 901         wpa_printf(MSG_DEBUG, "MPM: Received PLINK action %u", action_field);
 902
 903         if (action_field == PLINK_OPEN || action_field == PLINK_CONFIRM) {
 904                 wpa_printf(MSG_DEBUG, "MPM: Capability 0x%x",
 905                            WPA_GET_LE16(ies));
 906                 ies += 2;       /* capability */
 907                 ie_len -= 2;
 908         }
 909         if (action_field == PLINK_CONFIRM) {
 910                 wpa_printf(MSG_DEBUG, "MPM: AID 0x%x", WPA_GET_LE16(ies));
 911                 ies += 2;       /* aid */
 912                 ie_len -= 2;
 913         }
 914
 915         /* check for mesh peering, mesh id and mesh config IEs */
 916         if (ieee802_11_parse_elems(ies, ie_len, &elems, 0) == ParseFailed) {
 917                 wpa_printf(MSG_DEBUG, "MPM: Failed to parse PLINK IEs");
 918                 return;
 919         }
 920         if (!elems.peer_mgmt) {
 921                 wpa_printf(MSG_DEBUG,
 922                            "MPM: No Mesh Peering Management element");
 923                 return;
 924         }
 925         if (action_field != PLINK_CLOSE) {
 926                 if (!elems.mesh_id || !elems.mesh_config) {
 927                         wpa_printf(MSG_DEBUG,
 928                                    "MPM: No Mesh ID or Mesh Configuration element");
 929                         return;
 930                 }
 931
 932                 if (!matches_local(wpa_s, &elems)) {
 933                         wpa_printf(MSG_DEBUG,
 934                                    "MPM: Mesh ID or Mesh Configuration element do not match local MBSS");
 935                         return;
 936                 }
 937         }
 938
 939         ret = mesh_mpm_parse_peer_mgmt(wpa_s, action_field,
 940                                        elems.peer_mgmt,
 941                                        elems.peer_mgmt_len,
 942                                        &peer_mgmt_ie);
 943         if (ret) {
 944                 wpa_printf(MSG_DEBUG, "MPM: Mesh parsing rejected frame");
 945                 return;
 946         }
 947
 948         /* the sender's llid is our plid and vice-versa */
 949         plid = WPA_GET_LE16(peer_mgmt_ie.llid);
 950         if (peer_mgmt_ie.plid)
 951                 llid = WPA_GET_LE16(peer_mgmt_ie.plid);
 952         wpa_printf(MSG_DEBUG, "MPM: plid=0x%x llid=0x%x", plid, llid);
 953
 954         sta = ap_get_sta(hapd, mgmt->sa);
 955
 956         /*
 957          * If this is an open frame from an unknown STA, and this is an
 958          * open mesh, then go ahead and add the peer before proceeding.
 959          */
 960         if (!sta && action_field == PLINK_OPEN &&
 961             !(mconf->security & MESH_CONF_SEC_AMPE))
 962                 sta = mesh_mpm_add_peer(wpa_s, mgmt->sa, &elems);
 963
 964         if (!sta) {
 965                 wpa_printf(MSG_DEBUG, "MPM: No STA entry for peer");
 966                 return;
 967         }
 968
 969 #ifdef CONFIG_SAE
 970         /* peer is in sae_accepted? */
 971         if (sta->sae && sta->sae->state != SAE_ACCEPTED) {
 972                 wpa_printf(MSG_DEBUG, "MPM: SAE not yet accepted for peer");
 973                 return;
 974         }
 975 #endif /* CONFIG_SAE */
 976
 977         if (!sta->my_lid)
 978                 mesh_mpm_init_link(wpa_s, sta);
 979
 980         if ((mconf->security & MESH_CONF_SEC_AMPE) &&
 981             mesh_rsn_process_ampe(wpa_s, sta, &elems,
 982                                   &mgmt->u.action.category,
 983                                   ies, ie_len)) {
 984                 wpa_printf(MSG_DEBUG, "MPM: RSN process rejected frame");
 985                 return;
 986         }
 987
 988         if (sta->plink_state == PLINK_BLOCKED) {
 989                 wpa_printf(MSG_DEBUG, "MPM: PLINK_BLOCKED");
 990                 return;
 991         }
 992
 993         /* Now we will figure out the appropriate event... */
 994         switch (action_field) {
 995         case PLINK_OPEN:
 996                 if (plink_free_count(hapd) == 0) {
 997                         event = OPN_IGNR;
 998                         wpa_printf(MSG_INFO,
 999                                    "MPM: Peer link num over quota(%d)",
1000                                    hapd->max_plinks);
1001                 } else if (sta->peer_lid && sta->peer_lid != plid) {
1002                         event = OPN_IGNR;
1003                 } else {
1004                         sta->peer_lid = plid;
1005                         event = OPN_ACPT;
1006                 }
1007                 break;
1008         case PLINK_CONFIRM:
1009                 if (plink_free_count(hapd) == 0) {
1010                         event = CNF_IGNR;
1011                         wpa_printf(MSG_INFO,
1012                                    "MPM: Peer link num over quota(%d)",
1013                                    hapd->max_plinks);
1014                 } else if (sta->my_lid != llid ||
1015                            (sta->peer_lid && sta->peer_lid != plid)) {
1016                         event = CNF_IGNR;
1017                 } else {
1018                         if (!sta->peer_lid)
1019                                 sta->peer_lid = plid;
1020                         event = CNF_ACPT;
1021                 }
1022                 break;
1023         case PLINK_CLOSE:
1024                 if (sta->plink_state == PLINK_ESTAB)
1025                         /* Do not check for llid or plid. This does not
1026                          * follow the standard but since multiple plinks
1027                          * per cand are not supported, it is necessary in
1028                          * order to avoid a livelock when MP A sees an
1029                          * establish peer link to MP B but MP B does not
1030                          * see it. This can be caused by a timeout in
1031                          * B's peer link establishment or B being
1032                          * restarted.
1033                          */
1034                         event = CLS_ACPT;
1035                 else if (sta->peer_lid != plid)
1036                         event = CLS_IGNR;
1037                 else if (peer_mgmt_ie.plid && sta->my_lid != llid)
1038                         event = CLS_IGNR;
1039                 else
1040                         event = CLS_ACPT;
1041                 break;
1042         default:
1043                 /*
1044                  * This cannot be hit due to the action_field check above, but
1045                  * compilers may not be able to figure that out and can warn
1046                  * about uninitialized event below.
1047                  */
1048                 return;
1049         }
1050         mesh_mpm_fsm(wpa_s, sta, event);
1051 }
1052
1053
1054 /* called by ap_free_sta */
1055 void mesh_mpm_free_sta(struct sta_info *sta)
1056 {
1057         eloop_cancel_timeout(plink_timer, ELOOP_ALL_CTX, sta);
1058         eloop_cancel_timeout(mesh_auth_timer, ELOOP_ALL_CTX, sta);
1059 }