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