net/wireless/pmsr.c

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