net/wireless/pmsr.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2018 - 2021 Intel Corporation
   4  */
   5 #include <net/cfg80211.h>
   6 #include "core.h"
   7 #include "nl80211.h"
   8 #include "rdev-ops.h"
   9
  10 static int pmsr_parse_ftm(struct cfg80211_registered_device *rdev,
  11                           struct nlattr *ftmreq,
  12                           struct cfg80211_pmsr_request_peer *out,
  13                           struct genl_info *info)
  14 {
  15         const struct cfg80211_pmsr_capabilities *capa = rdev->wiphy.pmsr_capa;
  16         struct nlattr *tb[NL80211_PMSR_FTM_REQ_ATTR_MAX + 1];
  17         u32 preamble = NL80211_PREAMBLE_DMG; /* only optional in DMG */
  18
  19         /* validate existing data */
  20         if (!(rdev->wiphy.pmsr_capa->ftm.bandwidths & BIT(out->chandef.width))) {
  21                 NL_SET_ERR_MSG(info->extack, "FTM: unsupported bandwidth");
  22                 return -EINVAL;
  23         }
  24
  25         /* no validation needed - was already done via nested policy */
  26         nla_parse_nested_deprecated(tb, NL80211_PMSR_FTM_REQ_ATTR_MAX, ftmreq,
  27                                     NULL, NULL);
  28
  29         if (tb[NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE])
  30                 preamble = nla_get_u32(tb[NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE]);
  31
  32         /* set up values - struct is 0-initialized */
  33         out->ftm.requested = true;
  34
  35         switch (out->chandef.chan->band) {
  36         case NL80211_BAND_60GHZ:
  37                 /* optional */
  38                 break;
  39         default:
  40                 if (!tb[NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE]) {
  41                         NL_SET_ERR_MSG(info->extack,
  42                                        "FTM: must specify preamble");
  43                         return -EINVAL;
  44                 }
  45         }
  46
  47         if (!(capa->ftm.preambles & BIT(preamble))) {
  48                 NL_SET_ERR_MSG_ATTR(info->extack,
  49                                     tb[NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE],
  50                                     "FTM: invalid preamble");
  51                 return -EINVAL;
  52         }
  53
  54         out->ftm.preamble = preamble;
  55
  56         out->ftm.burst_period = 0;
  57         if (tb[NL80211_PMSR_FTM_REQ_ATTR_BURST_PERIOD])
  58                 out->ftm.burst_period =
  59                         nla_get_u32(tb[NL80211_PMSR_FTM_REQ_ATTR_BURST_PERIOD]);
  60
  61         out->ftm.asap = !!tb[NL80211_PMSR_FTM_REQ_ATTR_ASAP];
  62         if (out->ftm.asap && !capa->ftm.asap) {
  63                 NL_SET_ERR_MSG_ATTR(info->extack,
  64                                     tb[NL80211_PMSR_FTM_REQ_ATTR_ASAP],
  65                                     "FTM: ASAP mode not supported");
  66                 return -EINVAL;
  67         }
  68
  69         if (!out->ftm.asap && !capa->ftm.non_asap) {
  70                 NL_SET_ERR_MSG(info->extack,
  71                                "FTM: non-ASAP mode not supported");
  72                 return -EINVAL;
  73         }
  74
  75         out->ftm.num_bursts_exp = 0;
  76         if (tb[NL80211_PMSR_FTM_REQ_ATTR_NUM_BURSTS_EXP])
  77                 out->ftm.num_bursts_exp =
  78                         nla_get_u32(tb[NL80211_PMSR_FTM_REQ_ATTR_NUM_BURSTS_EXP]);
  79
  80         if (capa->ftm.max_bursts_exponent >= 0 &&
  81             out->ftm.num_bursts_exp > capa->ftm.max_bursts_exponent) {
  82                 NL_SET_ERR_MSG_ATTR(info->extack,
  83                                     tb[NL80211_PMSR_FTM_REQ_ATTR_NUM_BURSTS_EXP],
  84                                     "FTM: max NUM_BURSTS_EXP must be set lower than the device limit");
  85                 return -EINVAL;
  86         }
  87
  88         out->ftm.burst_duration = 15;
  89         if (tb[NL80211_PMSR_FTM_REQ_ATTR_BURST_DURATION])
  90                 out->ftm.burst_duration =
  91                         nla_get_u32(tb[NL80211_PMSR_FTM_REQ_ATTR_BURST_DURATION]);
  92
  93         out->ftm.ftms_per_burst = 0;
  94         if (tb[NL80211_PMSR_FTM_REQ_ATTR_FTMS_PER_BURST])
  95                 out->ftm.ftms_per_burst =
  96                         nla_get_u32(tb[NL80211_PMSR_FTM_REQ_ATTR_FTMS_PER_BURST]);
  97
  98         if (capa->ftm.max_ftms_per_burst &&
  99             (out->ftm.ftms_per_burst > capa->ftm.max_ftms_per_burst ||
 100              out->ftm.ftms_per_burst == 0)) {
 101                 NL_SET_ERR_MSG_ATTR(info->extack,
 102                                     tb[NL80211_PMSR_FTM_REQ_ATTR_FTMS_PER_BURST],
 103                                     "FTM: FTMs per burst must be set lower than the device limit but non-zero");
 104                 return -EINVAL;
 105         }
 106
 107         out->ftm.ftmr_retries = 3;
 108         if (tb[NL80211_PMSR_FTM_REQ_ATTR_NUM_FTMR_RETRIES])
 109                 out->ftm.ftmr_retries =
 110                         nla_get_u32(tb[NL80211_PMSR_FTM_REQ_ATTR_NUM_FTMR_RETRIES]);
 111
 112         out->ftm.request_lci = !!tb[NL80211_PMSR_FTM_REQ_ATTR_REQUEST_LCI];
 113         if (out->ftm.request_lci && !capa->ftm.request_lci) {
 114                 NL_SET_ERR_MSG_ATTR(info->extack,
 115                                     tb[NL80211_PMSR_FTM_REQ_ATTR_REQUEST_LCI],
 116                                     "FTM: LCI request not supported");
 117         }
 118
 119         out->ftm.request_civicloc =
 120                 !!tb[NL80211_PMSR_FTM_REQ_ATTR_REQUEST_CIVICLOC];
 121         if (out->ftm.request_civicloc && !capa->ftm.request_civicloc) {
 122                 NL_SET_ERR_MSG_ATTR(info->extack,
 123                                     tb[NL80211_PMSR_FTM_REQ_ATTR_REQUEST_CIVICLOC],
 124                             "FTM: civic location request not supported");
 125         }
 126
 127         out->ftm.trigger_based =
 128                 !!tb[NL80211_PMSR_FTM_REQ_ATTR_TRIGGER_BASED];
 129         if (out->ftm.trigger_based && !capa->ftm.trigger_based) {
 130                 NL_SET_ERR_MSG_ATTR(info->extack,
 131                                     tb[NL80211_PMSR_FTM_REQ_ATTR_TRIGGER_BASED],
 132                                     "FTM: trigger based ranging is not supported");
 133                 return -EINVAL;
 134         }
 135
 136         out->ftm.non_trigger_based =
 137                 !!tb[NL80211_PMSR_FTM_REQ_ATTR_NON_TRIGGER_BASED];
 138         if (out->ftm.non_trigger_based && !capa->ftm.non_trigger_based) {
 139                 NL_SET_ERR_MSG_ATTR(info->extack,
 140                                     tb[NL80211_PMSR_FTM_REQ_ATTR_NON_TRIGGER_BASED],
 141                                     "FTM: trigger based ranging is not supported");
 142                 return -EINVAL;
 143         }
 144
 145         if (out->ftm.trigger_based && out->ftm.non_trigger_based) {
 146                 NL_SET_ERR_MSG(info->extack,
 147                                "FTM: can't set both trigger based and non trigger based");
 148                 return -EINVAL;
 149         }
 150
 151         if ((out->ftm.trigger_based || out->ftm.non_trigger_based) &&
 152             out->ftm.preamble != NL80211_PREAMBLE_HE) {
 153                 NL_SET_ERR_MSG_ATTR(info->extack,
 154                                     tb[NL80211_PMSR_FTM_REQ_ATTR_PREAMBLE],
 155                                     "FTM: non EDCA based ranging must use HE preamble");
 156                 return -EINVAL;
 157         }
 158
 159         out->ftm.lmr_feedback =
 160                 !!tb[NL80211_PMSR_FTM_REQ_ATTR_LMR_FEEDBACK];
 161         if (!out->ftm.trigger_based && !out->ftm.non_trigger_based &&
 162             out->ftm.lmr_feedback) {
 163                 NL_SET_ERR_MSG_ATTR(info->extack,
 164                                     tb[NL80211_PMSR_FTM_REQ_ATTR_LMR_FEEDBACK],
 165                                     "FTM: LMR feedback set for EDCA based ranging");
 166                 return -EINVAL;
 167         }
 168
 169         if (tb[NL80211_PMSR_FTM_REQ_ATTR_BSS_COLOR]) {
 170                 if (!out->ftm.non_trigger_based && !out->ftm.trigger_based) {
 171                         NL_SET_ERR_MSG_ATTR(info->extack,
 172                                             tb[NL80211_PMSR_FTM_REQ_ATTR_BSS_COLOR],
 173                                             "FTM: BSS color set for EDCA based ranging");
 174                         return -EINVAL;
 175                 }
 176
 177                 out->ftm.bss_color =
 178                         nla_get_u8(tb[NL80211_PMSR_FTM_REQ_ATTR_BSS_COLOR]);
 179         }
 180
 181         return 0;
 182 }
 183
 184 static int pmsr_parse_peer(struct cfg80211_registered_device *rdev,
 185                            struct nlattr *peer,
 186                            struct cfg80211_pmsr_request_peer *out,
 187                            struct genl_info *info)
 188 {
 189         struct nlattr *tb[NL80211_PMSR_PEER_ATTR_MAX + 1];
 190         struct nlattr *req[NL80211_PMSR_REQ_ATTR_MAX + 1];
 191         struct nlattr *treq;
 192         int err, rem;
 193
 194         /* no validation needed - was already done via nested policy */
 195         nla_parse_nested_deprecated(tb, NL80211_PMSR_PEER_ATTR_MAX, peer,
 196                                     NULL, NULL);
 197
 198         if (!tb[NL80211_PMSR_PEER_ATTR_ADDR] ||
 199             !tb[NL80211_PMSR_PEER_ATTR_CHAN] ||
 200             !tb[NL80211_PMSR_PEER_ATTR_REQ]) {
 201                 NL_SET_ERR_MSG_ATTR(info->extack, peer,
 202                                     "insufficient peer data");
 203                 return -EINVAL;
 204         }
 205
 206         memcpy(out->addr, nla_data(tb[NL80211_PMSR_PEER_ATTR_ADDR]), ETH_ALEN);
 207
 208         /* reuse info->attrs */
 209         memset(info->attrs, 0, sizeof(*info->attrs) * (NL80211_ATTR_MAX + 1));
 210         err = nla_parse_nested_deprecated(info->attrs, NL80211_ATTR_MAX,
 211                                           tb[NL80211_PMSR_PEER_ATTR_CHAN],
 212                                           NULL, info->extack);
 213         if (err)
 214                 return err;
 215
 216         err = nl80211_parse_chandef(rdev, info, &out->chandef);
 217         if (err)
 218                 return err;
 219
 220         /* no validation needed - was already done via nested policy */
 221         nla_parse_nested_deprecated(req, NL80211_PMSR_REQ_ATTR_MAX,
 222                                     tb[NL80211_PMSR_PEER_ATTR_REQ], NULL,
 223                                     NULL);
 224
 225         if (!req[NL80211_PMSR_REQ_ATTR_DATA]) {
 226                 NL_SET_ERR_MSG_ATTR(info->extack,
 227                                     tb[NL80211_PMSR_PEER_ATTR_REQ],
 228                                     "missing request type/data");
 229                 return -EINVAL;
 230         }
 231
 232         if (req[NL80211_PMSR_REQ_ATTR_GET_AP_TSF])
 233                 out->report_ap_tsf = true;
 234
 235         if (out->report_ap_tsf && !rdev->wiphy.pmsr_capa->report_ap_tsf) {
 236                 NL_SET_ERR_MSG_ATTR(info->extack,
 237                                     req[NL80211_PMSR_REQ_ATTR_GET_AP_TSF],
 238                                     "reporting AP TSF is not supported");
 239                 return -EINVAL;
 240         }
 241
 242         nla_for_each_nested(treq, req[NL80211_PMSR_REQ_ATTR_DATA], rem) {
 243                 switch (nla_type(treq)) {
 244                 case NL80211_PMSR_TYPE_FTM:
 245                         err = pmsr_parse_ftm(rdev, treq, out, info);
 246                         break;
 247                 default:
 248                         NL_SET_ERR_MSG_ATTR(info->extack, treq,
 249                                             "unsupported measurement type");
 250                         err = -EINVAL;
 251                 }
 252         }
 253
 254         if (err)
 255                 return err;
 256
 257         return 0;
 258 }
 259
 260 int nl80211_pmsr_start(struct sk_buff *skb, struct genl_info *info)
 261 {
 262         struct nlattr *reqattr = info->attrs[NL80211_ATTR_PEER_MEASUREMENTS];
 263         struct cfg80211_registered_device *rdev = info->user_ptr[0];
 264         struct wireless_dev *wdev = info->user_ptr[1];
 265         struct cfg80211_pmsr_request *req;
 266         struct nlattr *peers, *peer;
 267         int count, rem, err, idx;
 268
 269         if (!rdev->wiphy.pmsr_capa)
 270                 return -EOPNOTSUPP;
 271
 272         if (!reqattr)
 273                 return -EINVAL;
 274
 275         peers = nla_find(nla_data(reqattr), nla_len(reqattr),
 276                          NL80211_PMSR_ATTR_PEERS);
 277         if (!peers)
 278                 return -EINVAL;
 279
 280         count = 0;
 281         nla_for_each_nested(peer, peers, rem) {
 282                 count++;
 283
 284                 if (count > rdev->wiphy.pmsr_capa->max_peers) {
 285                         NL_SET_ERR_MSG_ATTR(info->extack, peer,
 286                                             "Too many peers used");
 287                         return -EINVAL;
 288                 }
 289         }
 290
 291         req = kzalloc(struct_size(req, peers, count), GFP_KERNEL);
 292         if (!req)
 293                 return -ENOMEM;
 294
 295         if (info->attrs[NL80211_ATTR_TIMEOUT])
 296                 req->timeout = nla_get_u32(info->attrs[NL80211_ATTR_TIMEOUT]);
 297
 298         if (info->attrs[NL80211_ATTR_MAC]) {
 299                 if (!rdev->wiphy.pmsr_capa->randomize_mac_addr) {
 300                         NL_SET_ERR_MSG_ATTR(info->extack,
 301                                             info->attrs[NL80211_ATTR_MAC],
 302                                             "device cannot randomize MAC address");
 303                         err = -EINVAL;
 304                         goto out_err;
 305                 }
 306
 307                 err = nl80211_parse_random_mac(info->attrs, req->mac_addr,
 308                                                req->mac_addr_mask);
 309                 if (err)
 310                         goto out_err;
 311         } else {
 312                 memcpy(req->mac_addr, wdev_address(wdev), ETH_ALEN);
 313                 eth_broadcast_addr(req->mac_addr_mask);
 314         }
 315
 316         idx = 0;
 317         nla_for_each_nested(peer, peers, rem) {
 318                 /* NB: this reuses info->attrs, but we no longer need it */
 319                 err = pmsr_parse_peer(rdev, peer, &req->peers[idx], info);
 320                 if (err)
 321                         goto out_err;
 322                 idx++;
 323         }
 324
 325         req->n_peers = count;
 326         req->cookie = cfg80211_assign_cookie(rdev);
 327         req->nl_portid = info->snd_portid;
 328
 329         err = rdev_start_pmsr(rdev, wdev, req);
 330         if (err)
 331                 goto out_err;
 332
 333         list_add_tail(&req->list, &wdev->pmsr_list);
 334
 335         nl_set_extack_cookie_u64(info->extack, req->cookie);
 336         return 0;
 337 out_err:
 338         kfree(req);
 339         return err;
 340 }
 341
 342 void cfg80211_pmsr_complete(struct wireless_dev *wdev,
 343                             struct cfg80211_pmsr_request *req,
 344                             gfp_t gfp)
 345 {
 346         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 347         struct cfg80211_pmsr_request *tmp, *prev, *to_free = NULL;
 348         struct sk_buff *msg;
 349         void *hdr;
 350
 351         trace_cfg80211_pmsr_complete(wdev->wiphy, wdev, req->cookie);
 352
 353         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
 354         if (!msg)
 355                 goto free_request;
 356
 357         hdr = nl80211hdr_put(msg, 0, 0, 0,
 358                              NL80211_CMD_PEER_MEASUREMENT_COMPLETE);
 359         if (!hdr)
 360                 goto free_msg;
 361
 362         if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
 363             nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
 364                               NL80211_ATTR_PAD))
 365                 goto free_msg;
 366
 367         if (nla_put_u64_64bit(msg, NL80211_ATTR_COOKIE, req->cookie,
 368                               NL80211_ATTR_PAD))
 369                 goto free_msg;
 370
 371         genlmsg_end(msg, hdr);
 372         genlmsg_unicast(wiphy_net(wdev->wiphy), msg, req->nl_portid);
 373         goto free_request;
 374 free_msg:
 375         nlmsg_free(msg);
 376 free_request:
 377         spin_lock_bh(&wdev->pmsr_lock);
 378         /*
 379          * cfg80211_pmsr_process_abort() may have already moved this request
 380          * to the free list, and will free it later. In this case, don't free
 381          * it here.
 382          */
 383         list_for_each_entry_safe(tmp, prev, &wdev->pmsr_list, list) {
 384                 if (tmp == req) {
 385                         list_del(&req->list);
 386                         to_free = req;
 387                         break;
 388                 }
 389         }
 390         spin_unlock_bh(&wdev->pmsr_lock);
 391         kfree(to_free);
 392 }
 393 EXPORT_SYMBOL_GPL(cfg80211_pmsr_complete);
 394
 395 static int nl80211_pmsr_send_ftm_res(struct sk_buff *msg,
 396                                      struct cfg80211_pmsr_result *res)
 397 {
 398         if (res->status == NL80211_PMSR_STATUS_FAILURE) {
 399                 if (nla_put_u32(msg, NL80211_PMSR_FTM_RESP_ATTR_FAIL_REASON,
 400                                 res->ftm.failure_reason))
 401                         goto error;
 402
 403                 if (res->ftm.failure_reason ==
 404                         NL80211_PMSR_FTM_FAILURE_PEER_BUSY &&
 405                     res->ftm.busy_retry_time &&
 406                     nla_put_u32(msg, NL80211_PMSR_FTM_RESP_ATTR_BUSY_RETRY_TIME,
 407                                 res->ftm.busy_retry_time))
 408                         goto error;
 409
 410                 return 0;
 411         }
 412
 413 #define PUT(tp, attr, val)                                              \
 414         do {                                                            \
 415                 if (nla_put_##tp(msg,                                   \
 416                                  NL80211_PMSR_FTM_RESP_ATTR_##attr,     \
 417                                  res->ftm.val))                         \
 418                         goto error;                                     \
 419         } while (0)
 420
 421 #define PUTOPT(tp, attr, val)                                           \
 422         do {                                                            \
 423                 if (res->ftm.val##_valid)                               \
 424                         PUT(tp, attr, val);                             \
 425         } while (0)
 426
 427 #define PUT_U64(attr, val)                                              \
 428         do {                                                            \
 429                 if (nla_put_u64_64bit(msg,                              \
 430                                       NL80211_PMSR_FTM_RESP_ATTR_##attr,\
 431                                       res->ftm.val,                     \
 432                                       NL80211_PMSR_FTM_RESP_ATTR_PAD))  \
 433                         goto error;                                     \
 434         } while (0)
 435
 436 #define PUTOPT_U64(attr, val)                                           \
 437         do {                                                            \
 438                 if (res->ftm.val##_valid)                               \
 439                         PUT_U64(attr, val);                             \
 440         } while (0)
 441
 442         if (res->ftm.burst_index >= 0)
 443                 PUT(u32, BURST_INDEX, burst_index);
 444         PUTOPT(u32, NUM_FTMR_ATTEMPTS, num_ftmr_attempts);
 445         PUTOPT(u32, NUM_FTMR_SUCCESSES, num_ftmr_successes);
 446         PUT(u8, NUM_BURSTS_EXP, num_bursts_exp);
 447         PUT(u8, BURST_DURATION, burst_duration);
 448         PUT(u8, FTMS_PER_BURST, ftms_per_burst);
 449         PUTOPT(s32, RSSI_AVG, rssi_avg);
 450         PUTOPT(s32, RSSI_SPREAD, rssi_spread);
 451         if (res->ftm.tx_rate_valid &&
 452             !nl80211_put_sta_rate(msg, &res->ftm.tx_rate,
 453                                   NL80211_PMSR_FTM_RESP_ATTR_TX_RATE))
 454                 goto error;
 455         if (res->ftm.rx_rate_valid &&
 456             !nl80211_put_sta_rate(msg, &res->ftm.rx_rate,
 457                                   NL80211_PMSR_FTM_RESP_ATTR_RX_RATE))
 458                 goto error;
 459         PUTOPT_U64(RTT_AVG, rtt_avg);
 460         PUTOPT_U64(RTT_VARIANCE, rtt_variance);
 461         PUTOPT_U64(RTT_SPREAD, rtt_spread);
 462         PUTOPT_U64(DIST_AVG, dist_avg);
 463         PUTOPT_U64(DIST_VARIANCE, dist_variance);
 464         PUTOPT_U64(DIST_SPREAD, dist_spread);
 465         if (res->ftm.lci && res->ftm.lci_len &&
 466             nla_put(msg, NL80211_PMSR_FTM_RESP_ATTR_LCI,
 467                     res->ftm.lci_len, res->ftm.lci))
 468                 goto error;
 469         if (res->ftm.civicloc && res->ftm.civicloc_len &&
 470             nla_put(msg, NL80211_PMSR_FTM_RESP_ATTR_CIVICLOC,
 471                     res->ftm.civicloc_len, res->ftm.civicloc))
 472                 goto error;
 473 #undef PUT
 474 #undef PUTOPT
 475 #undef PUT_U64
 476 #undef PUTOPT_U64
 477
 478         return 0;
 479 error:
 480         return -ENOSPC;
 481 }
 482
 483 static int nl80211_pmsr_send_result(struct sk_buff *msg,
 484                                     struct cfg80211_pmsr_result *res)
 485 {
 486         struct nlattr *pmsr, *peers, *peer, *resp, *data, *typedata;
 487
 488         pmsr = nla_nest_start_noflag(msg, NL80211_ATTR_PEER_MEASUREMENTS);
 489         if (!pmsr)
 490                 goto error;
 491
 492         peers = nla_nest_start_noflag(msg, NL80211_PMSR_ATTR_PEERS);
 493         if (!peers)
 494                 goto error;
 495
 496         peer = nla_nest_start_noflag(msg, 1);
 497         if (!peer)
 498                 goto error;
 499
 500         if (nla_put(msg, NL80211_PMSR_PEER_ATTR_ADDR, ETH_ALEN, res->addr))
 501                 goto error;
 502
 503         resp = nla_nest_start_noflag(msg, NL80211_PMSR_PEER_ATTR_RESP);
 504         if (!resp)
 505                 goto error;
 506
 507         if (nla_put_u32(msg, NL80211_PMSR_RESP_ATTR_STATUS, res->status) ||
 508             nla_put_u64_64bit(msg, NL80211_PMSR_RESP_ATTR_HOST_TIME,
 509                               res->host_time, NL80211_PMSR_RESP_ATTR_PAD))
 510                 goto error;
 511
 512         if (res->ap_tsf_valid &&
 513             nla_put_u64_64bit(msg, NL80211_PMSR_RESP_ATTR_AP_TSF,
 514                               res->ap_tsf, NL80211_PMSR_RESP_ATTR_PAD))
 515                 goto error;
 516
 517         if (res->final && nla_put_flag(msg, NL80211_PMSR_RESP_ATTR_FINAL))
 518                 goto error;
 519
 520         data = nla_nest_start_noflag(msg, NL80211_PMSR_RESP_ATTR_DATA);
 521         if (!data)
 522                 goto error;
 523
 524         typedata = nla_nest_start_noflag(msg, res->type);
 525         if (!typedata)
 526                 goto error;
 527
 528         switch (res->type) {
 529         case NL80211_PMSR_TYPE_FTM:
 530                 if (nl80211_pmsr_send_ftm_res(msg, res))
 531                         goto error;
 532                 break;
 533         default:
 534                 WARN_ON(1);
 535         }
 536
 537         nla_nest_end(msg, typedata);
 538         nla_nest_end(msg, data);
 539         nla_nest_end(msg, resp);
 540         nla_nest_end(msg, peer);
 541         nla_nest_end(msg, peers);
 542         nla_nest_end(msg, pmsr);
 543
 544         return 0;
 545 error:
 546         return -ENOSPC;
 547 }
 548
 549 void cfg80211_pmsr_report(struct wireless_dev *wdev,
 550                           struct cfg80211_pmsr_request *req,
 551                           struct cfg80211_pmsr_result *result,
 552                           gfp_t gfp)
 553 {
 554         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 555         struct sk_buff *msg;
 556         void *hdr;
 557         int err;
 558
 559         trace_cfg80211_pmsr_report(wdev->wiphy, wdev, req->cookie,
 560                                    result->addr);
 561
 562         /*
 563          * Currently, only variable items are LCI and civic location,
 564          * both of which are reasonably short so we don't need to
 565          * worry about them here for the allocation.
 566          */
 567         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
 568         if (!msg)
 569                 return;
 570
 571         hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_PEER_MEASUREMENT_RESULT);
 572         if (!hdr)
 573                 goto free;
 574
 575         if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
 576             nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
 577                               NL80211_ATTR_PAD))
 578                 goto free;
 579
 580         if (nla_put_u64_64bit(msg, NL80211_ATTR_COOKIE, req->cookie,
 581                               NL80211_ATTR_PAD))
 582                 goto free;
 583
 584         err = nl80211_pmsr_send_result(msg, result);
 585         if (err) {
 586                 pr_err_ratelimited("peer measurement result: message didn't fit!");
 587                 goto free;
 588         }
 589
 590         genlmsg_end(msg, hdr);
 591         genlmsg_unicast(wiphy_net(wdev->wiphy), msg, req->nl_portid);
 592         return;
 593 free:
 594         nlmsg_free(msg);
 595 }
 596 EXPORT_SYMBOL_GPL(cfg80211_pmsr_report);
 597
 598 static void cfg80211_pmsr_process_abort(struct wireless_dev *wdev)
 599 {
 600         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 601         struct cfg80211_pmsr_request *req, *tmp;
 602         LIST_HEAD(free_list);
 603
 604         lockdep_assert_held(&wdev->mtx);
 605
 606         spin_lock_bh(&wdev->pmsr_lock);
 607         list_for_each_entry_safe(req, tmp, &wdev->pmsr_list, list) {
 608                 if (req->nl_portid)
 609                         continue;
 610                 list_move_tail(&req->list, &free_list);
 611         }
 612         spin_unlock_bh(&wdev->pmsr_lock);
 613
 614         list_for_each_entry_safe(req, tmp, &free_list, list) {
 615                 rdev_abort_pmsr(rdev, wdev, req);
 616
 617                 kfree(req);
 618         }
 619 }
 620
 621 void cfg80211_pmsr_free_wk(struct work_struct *work)
 622 {
 623         struct wireless_dev *wdev = container_of(work, struct wireless_dev,
 624                                                  pmsr_free_wk);
 625
 626         wdev_lock(wdev);
 627         cfg80211_pmsr_process_abort(wdev);
 628         wdev_unlock(wdev);
 629 }
 630
 631 void cfg80211_pmsr_wdev_down(struct wireless_dev *wdev)
 632 {
 633         struct cfg80211_pmsr_request *req;
 634         bool found = false;
 635
 636         spin_lock_bh(&wdev->pmsr_lock);
 637         list_for_each_entry(req, &wdev->pmsr_list, list) {
 638                 found = true;
 639                 req->nl_portid = 0;
 640         }
 641         spin_unlock_bh(&wdev->pmsr_lock);
 642
 643         if (found)
 644                 cfg80211_pmsr_process_abort(wdev);
 645
 646         WARN_ON(!list_empty(&wdev->pmsr_list));
 647 }
 648
 649 void cfg80211_release_pmsr(struct wireless_dev *wdev, u32 portid)
 650 {
 651         struct cfg80211_pmsr_request *req;
 652
 653         spin_lock_bh(&wdev->pmsr_lock);
 654         list_for_each_entry(req, &wdev->pmsr_list, list) {
 655                 if (req->nl_portid == portid) {
 656                         req->nl_portid = 0;
 657                         schedule_work(&wdev->pmsr_free_wk);
 658                 }
 659         }
 660         spin_unlock_bh(&wdev->pmsr_lock);
 661 }