net/wireless/pmsr.c

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Copyright (C) 2018 - 2019 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         return 0;
 162 }
 163
 164 static int pmsr_parse_peer(struct cfg80211_registered_device *rdev,
 165                            struct nlattr *peer,
 166                            struct cfg80211_pmsr_request_peer *out,
 167                            struct genl_info *info)
 168 {
 169         struct nlattr *tb[NL80211_PMSR_PEER_ATTR_MAX + 1];
 170         struct nlattr *req[NL80211_PMSR_REQ_ATTR_MAX + 1];
 171         struct nlattr *treq;
 172         int err, rem;
 173
 174         /* no validation needed - was already done via nested policy */
 175         nla_parse_nested_deprecated(tb, NL80211_PMSR_PEER_ATTR_MAX, peer,
 176                                     NULL, NULL);
 177
 178         if (!tb[NL80211_PMSR_PEER_ATTR_ADDR] ||
 179             !tb[NL80211_PMSR_PEER_ATTR_CHAN] ||
 180             !tb[NL80211_PMSR_PEER_ATTR_REQ]) {
 181                 NL_SET_ERR_MSG_ATTR(info->extack, peer,
 182                                     "insufficient peer data");
 183                 return -EINVAL;
 184         }
 185
 186         memcpy(out->addr, nla_data(tb[NL80211_PMSR_PEER_ATTR_ADDR]), ETH_ALEN);
 187
 188         /* reuse info->attrs */
 189         memset(info->attrs, 0, sizeof(*info->attrs) * (NL80211_ATTR_MAX + 1));
 190         /* need to validate here, we don't want to have validation recursion */
 191         err = nla_parse_nested_deprecated(info->attrs, NL80211_ATTR_MAX,
 192                                           tb[NL80211_PMSR_PEER_ATTR_CHAN],
 193                                           nl80211_policy, info->extack);
 194         if (err)
 195                 return err;
 196
 197         err = nl80211_parse_chandef(rdev, info, &out->chandef);
 198         if (err)
 199                 return err;
 200
 201         /* no validation needed - was already done via nested policy */
 202         nla_parse_nested_deprecated(req, NL80211_PMSR_REQ_ATTR_MAX,
 203                                     tb[NL80211_PMSR_PEER_ATTR_REQ], NULL,
 204                                     NULL);
 205
 206         if (!req[NL80211_PMSR_REQ_ATTR_DATA]) {
 207                 NL_SET_ERR_MSG_ATTR(info->extack,
 208                                     tb[NL80211_PMSR_PEER_ATTR_REQ],
 209                                     "missing request type/data");
 210                 return -EINVAL;
 211         }
 212
 213         if (req[NL80211_PMSR_REQ_ATTR_GET_AP_TSF])
 214                 out->report_ap_tsf = true;
 215
 216         if (out->report_ap_tsf && !rdev->wiphy.pmsr_capa->report_ap_tsf) {
 217                 NL_SET_ERR_MSG_ATTR(info->extack,
 218                                     req[NL80211_PMSR_REQ_ATTR_GET_AP_TSF],
 219                                     "reporting AP TSF is not supported");
 220                 return -EINVAL;
 221         }
 222
 223         nla_for_each_nested(treq, req[NL80211_PMSR_REQ_ATTR_DATA], rem) {
 224                 switch (nla_type(treq)) {
 225                 case NL80211_PMSR_TYPE_FTM:
 226                         err = pmsr_parse_ftm(rdev, treq, out, info);
 227                         break;
 228                 default:
 229                         NL_SET_ERR_MSG_ATTR(info->extack, treq,
 230                                             "unsupported measurement type");
 231                         err = -EINVAL;
 232                 }
 233         }
 234
 235         if (err)
 236                 return err;
 237
 238         return 0;
 239 }
 240
 241 int nl80211_pmsr_start(struct sk_buff *skb, struct genl_info *info)
 242 {
 243         struct nlattr *reqattr = info->attrs[NL80211_ATTR_PEER_MEASUREMENTS];
 244         struct cfg80211_registered_device *rdev = info->user_ptr[0];
 245         struct wireless_dev *wdev = info->user_ptr[1];
 246         struct cfg80211_pmsr_request *req;
 247         struct nlattr *peers, *peer;
 248         int count, rem, err, idx;
 249
 250         if (!rdev->wiphy.pmsr_capa)
 251                 return -EOPNOTSUPP;
 252
 253         if (!reqattr)
 254                 return -EINVAL;
 255
 256         peers = nla_find(nla_data(reqattr), nla_len(reqattr),
 257                          NL80211_PMSR_ATTR_PEERS);
 258         if (!peers)
 259                 return -EINVAL;
 260
 261         count = 0;
 262         nla_for_each_nested(peer, peers, rem) {
 263                 count++;
 264
 265                 if (count > rdev->wiphy.pmsr_capa->max_peers) {
 266                         NL_SET_ERR_MSG_ATTR(info->extack, peer,
 267                                             "Too many peers used");
 268                         return -EINVAL;
 269                 }
 270         }
 271
 272         req = kzalloc(struct_size(req, peers, count), GFP_KERNEL);
 273         if (!req)
 274                 return -ENOMEM;
 275
 276         if (info->attrs[NL80211_ATTR_TIMEOUT])
 277                 req->timeout = nla_get_u32(info->attrs[NL80211_ATTR_TIMEOUT]);
 278
 279         if (info->attrs[NL80211_ATTR_MAC]) {
 280                 if (!rdev->wiphy.pmsr_capa->randomize_mac_addr) {
 281                         NL_SET_ERR_MSG_ATTR(info->extack,
 282                                             info->attrs[NL80211_ATTR_MAC],
 283                                             "device cannot randomize MAC address");
 284                         err = -EINVAL;
 285                         goto out_err;
 286                 }
 287
 288                 err = nl80211_parse_random_mac(info->attrs, req->mac_addr,
 289                                                req->mac_addr_mask);
 290                 if (err)
 291                         goto out_err;
 292         } else {
 293                 memcpy(req->mac_addr, wdev_address(wdev), ETH_ALEN);
 294                 eth_broadcast_addr(req->mac_addr_mask);
 295         }
 296
 297         idx = 0;
 298         nla_for_each_nested(peer, peers, rem) {
 299                 /* NB: this reuses info->attrs, but we no longer need it */
 300                 err = pmsr_parse_peer(rdev, peer, &req->peers[idx], info);
 301                 if (err)
 302                         goto out_err;
 303                 idx++;
 304         }
 305
 306         req->n_peers = count;
 307         req->cookie = cfg80211_assign_cookie(rdev);
 308         req->nl_portid = info->snd_portid;
 309
 310         err = rdev_start_pmsr(rdev, wdev, req);
 311         if (err)
 312                 goto out_err;
 313
 314         list_add_tail(&req->list, &wdev->pmsr_list);
 315
 316         nl_set_extack_cookie_u64(info->extack, req->cookie);
 317         return 0;
 318 out_err:
 319         kfree(req);
 320         return err;
 321 }
 322
 323 void cfg80211_pmsr_complete(struct wireless_dev *wdev,
 324                             struct cfg80211_pmsr_request *req,
 325                             gfp_t gfp)
 326 {
 327         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 328         struct sk_buff *msg;
 329         void *hdr;
 330
 331         trace_cfg80211_pmsr_complete(wdev->wiphy, wdev, req->cookie);
 332
 333         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
 334         if (!msg)
 335                 goto free_request;
 336
 337         hdr = nl80211hdr_put(msg, 0, 0, 0,
 338                              NL80211_CMD_PEER_MEASUREMENT_COMPLETE);
 339         if (!hdr)
 340                 goto free_msg;
 341
 342         if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
 343             nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
 344                               NL80211_ATTR_PAD))
 345                 goto free_msg;
 346
 347         if (nla_put_u64_64bit(msg, NL80211_ATTR_COOKIE, req->cookie,
 348                               NL80211_ATTR_PAD))
 349                 goto free_msg;
 350
 351         genlmsg_end(msg, hdr);
 352         genlmsg_unicast(wiphy_net(wdev->wiphy), msg, req->nl_portid);
 353         goto free_request;
 354 free_msg:
 355         nlmsg_free(msg);
 356 free_request:
 357         spin_lock_bh(&wdev->pmsr_lock);
 358         list_del(&req->list);
 359         spin_unlock_bh(&wdev->pmsr_lock);
 360         kfree(req);
 361 }
 362 EXPORT_SYMBOL_GPL(cfg80211_pmsr_complete);
 363
 364 static int nl80211_pmsr_send_ftm_res(struct sk_buff *msg,
 365                                      struct cfg80211_pmsr_result *res)
 366 {
 367         if (res->status == NL80211_PMSR_STATUS_FAILURE) {
 368                 if (nla_put_u32(msg, NL80211_PMSR_FTM_RESP_ATTR_FAIL_REASON,
 369                                 res->ftm.failure_reason))
 370                         goto error;
 371
 372                 if (res->ftm.failure_reason ==
 373                         NL80211_PMSR_FTM_FAILURE_PEER_BUSY &&
 374                     res->ftm.busy_retry_time &&
 375                     nla_put_u32(msg, NL80211_PMSR_FTM_RESP_ATTR_BUSY_RETRY_TIME,
 376                                 res->ftm.busy_retry_time))
 377                         goto error;
 378
 379                 return 0;
 380         }
 381
 382 #define PUT(tp, attr, val)                                              \
 383         do {                                                            \
 384                 if (nla_put_##tp(msg,                                   \
 385                                  NL80211_PMSR_FTM_RESP_ATTR_##attr,     \
 386                                  res->ftm.val))                         \
 387                         goto error;                                     \
 388         } while (0)
 389
 390 #define PUTOPT(tp, attr, val)                                           \
 391         do {                                                            \
 392                 if (res->ftm.val##_valid)                               \
 393                         PUT(tp, attr, val);                             \
 394         } while (0)
 395
 396 #define PUT_U64(attr, val)                                              \
 397         do {                                                            \
 398                 if (nla_put_u64_64bit(msg,                              \
 399                                       NL80211_PMSR_FTM_RESP_ATTR_##attr,\
 400                                       res->ftm.val,                     \
 401                                       NL80211_PMSR_FTM_RESP_ATTR_PAD))  \
 402                         goto error;                                     \
 403         } while (0)
 404
 405 #define PUTOPT_U64(attr, val)                                           \
 406         do {                                                            \
 407                 if (res->ftm.val##_valid)                               \
 408                         PUT_U64(attr, val);                             \
 409         } while (0)
 410
 411         if (res->ftm.burst_index >= 0)
 412                 PUT(u32, BURST_INDEX, burst_index);
 413         PUTOPT(u32, NUM_FTMR_ATTEMPTS, num_ftmr_attempts);
 414         PUTOPT(u32, NUM_FTMR_SUCCESSES, num_ftmr_successes);
 415         PUT(u8, NUM_BURSTS_EXP, num_bursts_exp);
 416         PUT(u8, BURST_DURATION, burst_duration);
 417         PUT(u8, FTMS_PER_BURST, ftms_per_burst);
 418         PUTOPT(s32, RSSI_AVG, rssi_avg);
 419         PUTOPT(s32, RSSI_SPREAD, rssi_spread);
 420         if (res->ftm.tx_rate_valid &&
 421             !nl80211_put_sta_rate(msg, &res->ftm.tx_rate,
 422                                   NL80211_PMSR_FTM_RESP_ATTR_TX_RATE))
 423                 goto error;
 424         if (res->ftm.rx_rate_valid &&
 425             !nl80211_put_sta_rate(msg, &res->ftm.rx_rate,
 426                                   NL80211_PMSR_FTM_RESP_ATTR_RX_RATE))
 427                 goto error;
 428         PUTOPT_U64(RTT_AVG, rtt_avg);
 429         PUTOPT_U64(RTT_VARIANCE, rtt_variance);
 430         PUTOPT_U64(RTT_SPREAD, rtt_spread);
 431         PUTOPT_U64(DIST_AVG, dist_avg);
 432         PUTOPT_U64(DIST_VARIANCE, dist_variance);
 433         PUTOPT_U64(DIST_SPREAD, dist_spread);
 434         if (res->ftm.lci && res->ftm.lci_len &&
 435             nla_put(msg, NL80211_PMSR_FTM_RESP_ATTR_LCI,
 436                     res->ftm.lci_len, res->ftm.lci))
 437                 goto error;
 438         if (res->ftm.civicloc && res->ftm.civicloc_len &&
 439             nla_put(msg, NL80211_PMSR_FTM_RESP_ATTR_CIVICLOC,
 440                     res->ftm.civicloc_len, res->ftm.civicloc))
 441                 goto error;
 442 #undef PUT
 443 #undef PUTOPT
 444 #undef PUT_U64
 445 #undef PUTOPT_U64
 446
 447         return 0;
 448 error:
 449         return -ENOSPC;
 450 }
 451
 452 static int nl80211_pmsr_send_result(struct sk_buff *msg,
 453                                     struct cfg80211_pmsr_result *res)
 454 {
 455         struct nlattr *pmsr, *peers, *peer, *resp, *data, *typedata;
 456
 457         pmsr = nla_nest_start_noflag(msg, NL80211_ATTR_PEER_MEASUREMENTS);
 458         if (!pmsr)
 459                 goto error;
 460
 461         peers = nla_nest_start_noflag(msg, NL80211_PMSR_ATTR_PEERS);
 462         if (!peers)
 463                 goto error;
 464
 465         peer = nla_nest_start_noflag(msg, 1);
 466         if (!peer)
 467                 goto error;
 468
 469         if (nla_put(msg, NL80211_PMSR_PEER_ATTR_ADDR, ETH_ALEN, res->addr))
 470                 goto error;
 471
 472         resp = nla_nest_start_noflag(msg, NL80211_PMSR_PEER_ATTR_RESP);
 473         if (!resp)
 474                 goto error;
 475
 476         if (nla_put_u32(msg, NL80211_PMSR_RESP_ATTR_STATUS, res->status) ||
 477             nla_put_u64_64bit(msg, NL80211_PMSR_RESP_ATTR_HOST_TIME,
 478                               res->host_time, NL80211_PMSR_RESP_ATTR_PAD))
 479                 goto error;
 480
 481         if (res->ap_tsf_valid &&
 482             nla_put_u64_64bit(msg, NL80211_PMSR_RESP_ATTR_AP_TSF,
 483                               res->ap_tsf, NL80211_PMSR_RESP_ATTR_PAD))
 484                 goto error;
 485
 486         if (res->final && nla_put_flag(msg, NL80211_PMSR_RESP_ATTR_FINAL))
 487                 goto error;
 488
 489         data = nla_nest_start_noflag(msg, NL80211_PMSR_RESP_ATTR_DATA);
 490         if (!data)
 491                 goto error;
 492
 493         typedata = nla_nest_start_noflag(msg, res->type);
 494         if (!typedata)
 495                 goto error;
 496
 497         switch (res->type) {
 498         case NL80211_PMSR_TYPE_FTM:
 499                 if (nl80211_pmsr_send_ftm_res(msg, res))
 500                         goto error;
 501                 break;
 502         default:
 503                 WARN_ON(1);
 504         }
 505
 506         nla_nest_end(msg, typedata);
 507         nla_nest_end(msg, data);
 508         nla_nest_end(msg, resp);
 509         nla_nest_end(msg, peer);
 510         nla_nest_end(msg, peers);
 511         nla_nest_end(msg, pmsr);
 512
 513         return 0;
 514 error:
 515         return -ENOSPC;
 516 }
 517
 518 void cfg80211_pmsr_report(struct wireless_dev *wdev,
 519                           struct cfg80211_pmsr_request *req,
 520                           struct cfg80211_pmsr_result *result,
 521                           gfp_t gfp)
 522 {
 523         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 524         struct sk_buff *msg;
 525         void *hdr;
 526         int err;
 527
 528         trace_cfg80211_pmsr_report(wdev->wiphy, wdev, req->cookie,
 529                                    result->addr);
 530
 531         /*
 532          * Currently, only variable items are LCI and civic location,
 533          * both of which are reasonably short so we don't need to
 534          * worry about them here for the allocation.
 535          */
 536         msg = nlmsg_new(NLMSG_DEFAULT_SIZE, gfp);
 537         if (!msg)
 538                 return;
 539
 540         hdr = nl80211hdr_put(msg, 0, 0, 0, NL80211_CMD_PEER_MEASUREMENT_RESULT);
 541         if (!hdr)
 542                 goto free;
 543
 544         if (nla_put_u32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx) ||
 545             nla_put_u64_64bit(msg, NL80211_ATTR_WDEV, wdev_id(wdev),
 546                               NL80211_ATTR_PAD))
 547                 goto free;
 548
 549         if (nla_put_u64_64bit(msg, NL80211_ATTR_COOKIE, req->cookie,
 550                               NL80211_ATTR_PAD))
 551                 goto free;
 552
 553         err = nl80211_pmsr_send_result(msg, result);
 554         if (err) {
 555                 pr_err_ratelimited("peer measurement result: message didn't fit!");
 556                 goto free;
 557         }
 558
 559         genlmsg_end(msg, hdr);
 560         genlmsg_unicast(wiphy_net(wdev->wiphy), msg, req->nl_portid);
 561         return;
 562 free:
 563         nlmsg_free(msg);
 564 }
 565 EXPORT_SYMBOL_GPL(cfg80211_pmsr_report);
 566
 567 static void cfg80211_pmsr_process_abort(struct wireless_dev *wdev)
 568 {
 569         struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
 570         struct cfg80211_pmsr_request *req, *tmp;
 571         LIST_HEAD(free_list);
 572
 573         lockdep_assert_held(&wdev->mtx);
 574
 575         spin_lock_bh(&wdev->pmsr_lock);
 576         list_for_each_entry_safe(req, tmp, &wdev->pmsr_list, list) {
 577                 if (req->nl_portid)
 578                         continue;
 579                 list_move_tail(&req->list, &free_list);
 580         }
 581         spin_unlock_bh(&wdev->pmsr_lock);
 582
 583         list_for_each_entry_safe(req, tmp, &free_list, list) {
 584                 rdev_abort_pmsr(rdev, wdev, req);
 585
 586                 kfree(req);
 587         }
 588 }
 589
 590 void cfg80211_pmsr_free_wk(struct work_struct *work)
 591 {
 592         struct wireless_dev *wdev = container_of(work, struct wireless_dev,
 593                                                  pmsr_free_wk);
 594
 595         wdev_lock(wdev);
 596         cfg80211_pmsr_process_abort(wdev);
 597         wdev_unlock(wdev);
 598 }
 599
 600 void cfg80211_pmsr_wdev_down(struct wireless_dev *wdev)
 601 {
 602         struct cfg80211_pmsr_request *req;
 603         bool found = false;
 604
 605         spin_lock_bh(&wdev->pmsr_lock);
 606         list_for_each_entry(req, &wdev->pmsr_list, list) {
 607                 found = true;
 608                 req->nl_portid = 0;
 609         }
 610         spin_unlock_bh(&wdev->pmsr_lock);
 611
 612         if (found)
 613                 cfg80211_pmsr_process_abort(wdev);
 614
 615         WARN_ON(!list_empty(&wdev->pmsr_list));
 616 }
 617
 618 void cfg80211_release_pmsr(struct wireless_dev *wdev, u32 portid)
 619 {
 620         struct cfg80211_pmsr_request *req;
 621
 622         spin_lock_bh(&wdev->pmsr_lock);
 623         list_for_each_entry(req, &wdev->pmsr_list, list) {
 624                 if (req->nl_portid == portid) {
 625                         req->nl_portid = 0;
 626                         schedule_work(&wdev->pmsr_free_wk);
 627                 }
 628         }
 629         spin_unlock_bh(&wdev->pmsr_lock);
 630 }
 631
 632 #endif /* __PMSR_H */