linux/net/wireless/util.c
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   1/*
   2 * Wireless utility functions
   3 *
   4 * Copyright 2007-2009  Johannes Berg <johannes@sipsolutions.net>
   5 */
   6#include <linux/export.h>
   7#include <linux/bitops.h>
   8#include <linux/etherdevice.h>
   9#include <linux/slab.h>
  10#include <net/cfg80211.h>
  11#include <net/ip.h>
  12#include <net/dsfield.h>
  13#include "core.h"
  14
  15struct ieee80211_rate *
  16ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
  17                            u32 basic_rates, int bitrate)
  18{
  19        struct ieee80211_rate *result = &sband->bitrates[0];
  20        int i;
  21
  22        for (i = 0; i < sband->n_bitrates; i++) {
  23                if (!(basic_rates & BIT(i)))
  24                        continue;
  25                if (sband->bitrates[i].bitrate > bitrate)
  26                        continue;
  27                result = &sband->bitrates[i];
  28        }
  29
  30        return result;
  31}
  32EXPORT_SYMBOL(ieee80211_get_response_rate);
  33
  34int ieee80211_channel_to_frequency(int chan, enum ieee80211_band band)
  35{
  36        /* see 802.11 17.3.8.3.2 and Annex J
  37         * there are overlapping channel numbers in 5GHz and 2GHz bands */
  38        if (chan <= 0)
  39                return 0; /* not supported */
  40        switch (band) {
  41        case IEEE80211_BAND_2GHZ:
  42                if (chan == 14)
  43                        return 2484;
  44                else if (chan < 14)
  45                        return 2407 + chan * 5;
  46                break;
  47        case IEEE80211_BAND_5GHZ:
  48                if (chan >= 182 && chan <= 196)
  49                        return 4000 + chan * 5;
  50                else
  51                        return 5000 + chan * 5;
  52                break;
  53        case IEEE80211_BAND_60GHZ:
  54                if (chan < 5)
  55                        return 56160 + chan * 2160;
  56                break;
  57        default:
  58                ;
  59        }
  60        return 0; /* not supported */
  61}
  62EXPORT_SYMBOL(ieee80211_channel_to_frequency);
  63
  64int ieee80211_frequency_to_channel(int freq)
  65{
  66        /* see 802.11 17.3.8.3.2 and Annex J */
  67        if (freq == 2484)
  68                return 14;
  69        else if (freq < 2484)
  70                return (freq - 2407) / 5;
  71        else if (freq >= 4910 && freq <= 4980)
  72                return (freq - 4000) / 5;
  73        else if (freq <= 45000) /* DMG band lower limit */
  74                return (freq - 5000) / 5;
  75        else if (freq >= 58320 && freq <= 64800)
  76                return (freq - 56160) / 2160;
  77        else
  78                return 0;
  79}
  80EXPORT_SYMBOL(ieee80211_frequency_to_channel);
  81
  82struct ieee80211_channel *__ieee80211_get_channel(struct wiphy *wiphy,
  83                                                  int freq)
  84{
  85        enum ieee80211_band band;
  86        struct ieee80211_supported_band *sband;
  87        int i;
  88
  89        for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
  90                sband = wiphy->bands[band];
  91
  92                if (!sband)
  93                        continue;
  94
  95                for (i = 0; i < sband->n_channels; i++) {
  96                        if (sband->channels[i].center_freq == freq)
  97                                return &sband->channels[i];
  98                }
  99        }
 100
 101        return NULL;
 102}
 103EXPORT_SYMBOL(__ieee80211_get_channel);
 104
 105static void set_mandatory_flags_band(struct ieee80211_supported_band *sband,
 106                                     enum ieee80211_band band)
 107{
 108        int i, want;
 109
 110        switch (band) {
 111        case IEEE80211_BAND_5GHZ:
 112                want = 3;
 113                for (i = 0; i < sband->n_bitrates; i++) {
 114                        if (sband->bitrates[i].bitrate == 60 ||
 115                            sband->bitrates[i].bitrate == 120 ||
 116                            sband->bitrates[i].bitrate == 240) {
 117                                sband->bitrates[i].flags |=
 118                                        IEEE80211_RATE_MANDATORY_A;
 119                                want--;
 120                        }
 121                }
 122                WARN_ON(want);
 123                break;
 124        case IEEE80211_BAND_2GHZ:
 125                want = 7;
 126                for (i = 0; i < sband->n_bitrates; i++) {
 127                        if (sband->bitrates[i].bitrate == 10) {
 128                                sband->bitrates[i].flags |=
 129                                        IEEE80211_RATE_MANDATORY_B |
 130                                        IEEE80211_RATE_MANDATORY_G;
 131                                want--;
 132                        }
 133
 134                        if (sband->bitrates[i].bitrate == 20 ||
 135                            sband->bitrates[i].bitrate == 55 ||
 136                            sband->bitrates[i].bitrate == 110 ||
 137                            sband->bitrates[i].bitrate == 60 ||
 138                            sband->bitrates[i].bitrate == 120 ||
 139                            sband->bitrates[i].bitrate == 240) {
 140                                sband->bitrates[i].flags |=
 141                                        IEEE80211_RATE_MANDATORY_G;
 142                                want--;
 143                        }
 144
 145                        if (sband->bitrates[i].bitrate != 10 &&
 146                            sband->bitrates[i].bitrate != 20 &&
 147                            sband->bitrates[i].bitrate != 55 &&
 148                            sband->bitrates[i].bitrate != 110)
 149                                sband->bitrates[i].flags |=
 150                                        IEEE80211_RATE_ERP_G;
 151                }
 152                WARN_ON(want != 0 && want != 3 && want != 6);
 153                break;
 154        case IEEE80211_BAND_60GHZ:
 155                /* check for mandatory HT MCS 1..4 */
 156                WARN_ON(!sband->ht_cap.ht_supported);
 157                WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
 158                break;
 159        case IEEE80211_NUM_BANDS:
 160                WARN_ON(1);
 161                break;
 162        }
 163}
 164
 165void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
 166{
 167        enum ieee80211_band band;
 168
 169        for (band = 0; band < IEEE80211_NUM_BANDS; band++)
 170                if (wiphy->bands[band])
 171                        set_mandatory_flags_band(wiphy->bands[band], band);
 172}
 173
 174bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
 175{
 176        int i;
 177        for (i = 0; i < wiphy->n_cipher_suites; i++)
 178                if (cipher == wiphy->cipher_suites[i])
 179                        return true;
 180        return false;
 181}
 182
 183int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
 184                                   struct key_params *params, int key_idx,
 185                                   bool pairwise, const u8 *mac_addr)
 186{
 187        if (key_idx > 5)
 188                return -EINVAL;
 189
 190        if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
 191                return -EINVAL;
 192
 193        if (pairwise && !mac_addr)
 194                return -EINVAL;
 195
 196        /*
 197         * Disallow pairwise keys with non-zero index unless it's WEP
 198         * or a vendor specific cipher (because current deployments use
 199         * pairwise WEP keys with non-zero indices and for vendor specific
 200         * ciphers this should be validated in the driver or hardware level
 201         * - but 802.11i clearly specifies to use zero)
 202         */
 203        if (pairwise && key_idx &&
 204            ((params->cipher == WLAN_CIPHER_SUITE_TKIP) ||
 205             (params->cipher == WLAN_CIPHER_SUITE_CCMP) ||
 206             (params->cipher == WLAN_CIPHER_SUITE_AES_CMAC)))
 207                return -EINVAL;
 208
 209        switch (params->cipher) {
 210        case WLAN_CIPHER_SUITE_WEP40:
 211                if (params->key_len != WLAN_KEY_LEN_WEP40)
 212                        return -EINVAL;
 213                break;
 214        case WLAN_CIPHER_SUITE_TKIP:
 215                if (params->key_len != WLAN_KEY_LEN_TKIP)
 216                        return -EINVAL;
 217                break;
 218        case WLAN_CIPHER_SUITE_CCMP:
 219                if (params->key_len != WLAN_KEY_LEN_CCMP)
 220                        return -EINVAL;
 221                break;
 222        case WLAN_CIPHER_SUITE_WEP104:
 223                if (params->key_len != WLAN_KEY_LEN_WEP104)
 224                        return -EINVAL;
 225                break;
 226        case WLAN_CIPHER_SUITE_AES_CMAC:
 227                if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
 228                        return -EINVAL;
 229                break;
 230        default:
 231                /*
 232                 * We don't know anything about this algorithm,
 233                 * allow using it -- but the driver must check
 234                 * all parameters! We still check below whether
 235                 * or not the driver supports this algorithm,
 236                 * of course.
 237                 */
 238                break;
 239        }
 240
 241        if (params->seq) {
 242                switch (params->cipher) {
 243                case WLAN_CIPHER_SUITE_WEP40:
 244                case WLAN_CIPHER_SUITE_WEP104:
 245                        /* These ciphers do not use key sequence */
 246                        return -EINVAL;
 247                case WLAN_CIPHER_SUITE_TKIP:
 248                case WLAN_CIPHER_SUITE_CCMP:
 249                case WLAN_CIPHER_SUITE_AES_CMAC:
 250                        if (params->seq_len != 6)
 251                                return -EINVAL;
 252                        break;
 253                }
 254        }
 255
 256        if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
 257                return -EINVAL;
 258
 259        return 0;
 260}
 261
 262unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
 263{
 264        unsigned int hdrlen = 24;
 265
 266        if (ieee80211_is_data(fc)) {
 267                if (ieee80211_has_a4(fc))
 268                        hdrlen = 30;
 269                if (ieee80211_is_data_qos(fc)) {
 270                        hdrlen += IEEE80211_QOS_CTL_LEN;
 271                        if (ieee80211_has_order(fc))
 272                                hdrlen += IEEE80211_HT_CTL_LEN;
 273                }
 274                goto out;
 275        }
 276
 277        if (ieee80211_is_ctl(fc)) {
 278                /*
 279                 * ACK and CTS are 10 bytes, all others 16. To see how
 280                 * to get this condition consider
 281                 *   subtype mask:   0b0000000011110000 (0x00F0)
 282                 *   ACK subtype:    0b0000000011010000 (0x00D0)
 283                 *   CTS subtype:    0b0000000011000000 (0x00C0)
 284                 *   bits that matter:         ^^^      (0x00E0)
 285                 *   value of those: 0b0000000011000000 (0x00C0)
 286                 */
 287                if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
 288                        hdrlen = 10;
 289                else
 290                        hdrlen = 16;
 291        }
 292out:
 293        return hdrlen;
 294}
 295EXPORT_SYMBOL(ieee80211_hdrlen);
 296
 297unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
 298{
 299        const struct ieee80211_hdr *hdr =
 300                        (const struct ieee80211_hdr *)skb->data;
 301        unsigned int hdrlen;
 302
 303        if (unlikely(skb->len < 10))
 304                return 0;
 305        hdrlen = ieee80211_hdrlen(hdr->frame_control);
 306        if (unlikely(hdrlen > skb->len))
 307                return 0;
 308        return hdrlen;
 309}
 310EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
 311
 312static int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
 313{
 314        int ae = meshhdr->flags & MESH_FLAGS_AE;
 315        /* 7.1.3.5a.2 */
 316        switch (ae) {
 317        case 0:
 318                return 6;
 319        case MESH_FLAGS_AE_A4:
 320                return 12;
 321        case MESH_FLAGS_AE_A5_A6:
 322                return 18;
 323        case (MESH_FLAGS_AE_A4 | MESH_FLAGS_AE_A5_A6):
 324                return 24;
 325        default:
 326                return 6;
 327        }
 328}
 329
 330int ieee80211_data_to_8023(struct sk_buff *skb, const u8 *addr,
 331                           enum nl80211_iftype iftype)
 332{
 333        struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 334        u16 hdrlen, ethertype;
 335        u8 *payload;
 336        u8 dst[ETH_ALEN];
 337        u8 src[ETH_ALEN] __aligned(2);
 338
 339        if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
 340                return -1;
 341
 342        hdrlen = ieee80211_hdrlen(hdr->frame_control);
 343
 344        /* convert IEEE 802.11 header + possible LLC headers into Ethernet
 345         * header
 346         * IEEE 802.11 address fields:
 347         * ToDS FromDS Addr1 Addr2 Addr3 Addr4
 348         *   0     0   DA    SA    BSSID n/a
 349         *   0     1   DA    BSSID SA    n/a
 350         *   1     0   BSSID SA    DA    n/a
 351         *   1     1   RA    TA    DA    SA
 352         */
 353        memcpy(dst, ieee80211_get_DA(hdr), ETH_ALEN);
 354        memcpy(src, ieee80211_get_SA(hdr), ETH_ALEN);
 355
 356        switch (hdr->frame_control &
 357                cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
 358        case cpu_to_le16(IEEE80211_FCTL_TODS):
 359                if (unlikely(iftype != NL80211_IFTYPE_AP &&
 360                             iftype != NL80211_IFTYPE_AP_VLAN &&
 361                             iftype != NL80211_IFTYPE_P2P_GO))
 362                        return -1;
 363                break;
 364        case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
 365                if (unlikely(iftype != NL80211_IFTYPE_WDS &&
 366                             iftype != NL80211_IFTYPE_MESH_POINT &&
 367                             iftype != NL80211_IFTYPE_AP_VLAN &&
 368                             iftype != NL80211_IFTYPE_STATION))
 369                        return -1;
 370                if (iftype == NL80211_IFTYPE_MESH_POINT) {
 371                        struct ieee80211s_hdr *meshdr =
 372                                (struct ieee80211s_hdr *) (skb->data + hdrlen);
 373                        /* make sure meshdr->flags is on the linear part */
 374                        if (!pskb_may_pull(skb, hdrlen + 1))
 375                                return -1;
 376                        if (meshdr->flags & MESH_FLAGS_AE_A5_A6) {
 377                                skb_copy_bits(skb, hdrlen +
 378                                        offsetof(struct ieee80211s_hdr, eaddr1),
 379                                        dst, ETH_ALEN);
 380                                skb_copy_bits(skb, hdrlen +
 381                                        offsetof(struct ieee80211s_hdr, eaddr2),
 382                                        src, ETH_ALEN);
 383                        }
 384                        hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 385                }
 386                break;
 387        case cpu_to_le16(IEEE80211_FCTL_FROMDS):
 388                if ((iftype != NL80211_IFTYPE_STATION &&
 389                     iftype != NL80211_IFTYPE_P2P_CLIENT &&
 390                     iftype != NL80211_IFTYPE_MESH_POINT) ||
 391                    (is_multicast_ether_addr(dst) &&
 392                     ether_addr_equal(src, addr)))
 393                        return -1;
 394                if (iftype == NL80211_IFTYPE_MESH_POINT) {
 395                        struct ieee80211s_hdr *meshdr =
 396                                (struct ieee80211s_hdr *) (skb->data + hdrlen);
 397                        /* make sure meshdr->flags is on the linear part */
 398                        if (!pskb_may_pull(skb, hdrlen + 1))
 399                                return -1;
 400                        if (meshdr->flags & MESH_FLAGS_AE_A4)
 401                                skb_copy_bits(skb, hdrlen +
 402                                        offsetof(struct ieee80211s_hdr, eaddr1),
 403                                        src, ETH_ALEN);
 404                        hdrlen += ieee80211_get_mesh_hdrlen(meshdr);
 405                }
 406                break;
 407        case cpu_to_le16(0):
 408                if (iftype != NL80211_IFTYPE_ADHOC &&
 409                    iftype != NL80211_IFTYPE_STATION)
 410                                return -1;
 411                break;
 412        }
 413
 414        if (!pskb_may_pull(skb, hdrlen + 8))
 415                return -1;
 416
 417        payload = skb->data + hdrlen;
 418        ethertype = (payload[6] << 8) | payload[7];
 419
 420        if (likely((ether_addr_equal(payload, rfc1042_header) &&
 421                    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 422                   ether_addr_equal(payload, bridge_tunnel_header))) {
 423                /* remove RFC1042 or Bridge-Tunnel encapsulation and
 424                 * replace EtherType */
 425                skb_pull(skb, hdrlen + 6);
 426                memcpy(skb_push(skb, ETH_ALEN), src, ETH_ALEN);
 427                memcpy(skb_push(skb, ETH_ALEN), dst, ETH_ALEN);
 428        } else {
 429                struct ethhdr *ehdr;
 430                __be16 len;
 431
 432                skb_pull(skb, hdrlen);
 433                len = htons(skb->len);
 434                ehdr = (struct ethhdr *) skb_push(skb, sizeof(struct ethhdr));
 435                memcpy(ehdr->h_dest, dst, ETH_ALEN);
 436                memcpy(ehdr->h_source, src, ETH_ALEN);
 437                ehdr->h_proto = len;
 438        }
 439        return 0;
 440}
 441EXPORT_SYMBOL(ieee80211_data_to_8023);
 442
 443int ieee80211_data_from_8023(struct sk_buff *skb, const u8 *addr,
 444                             enum nl80211_iftype iftype, u8 *bssid, bool qos)
 445{
 446        struct ieee80211_hdr hdr;
 447        u16 hdrlen, ethertype;
 448        __le16 fc;
 449        const u8 *encaps_data;
 450        int encaps_len, skip_header_bytes;
 451        int nh_pos, h_pos;
 452        int head_need;
 453
 454        if (unlikely(skb->len < ETH_HLEN))
 455                return -EINVAL;
 456
 457        nh_pos = skb_network_header(skb) - skb->data;
 458        h_pos = skb_transport_header(skb) - skb->data;
 459
 460        /* convert Ethernet header to proper 802.11 header (based on
 461         * operation mode) */
 462        ethertype = (skb->data[12] << 8) | skb->data[13];
 463        fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 464
 465        switch (iftype) {
 466        case NL80211_IFTYPE_AP:
 467        case NL80211_IFTYPE_AP_VLAN:
 468        case NL80211_IFTYPE_P2P_GO:
 469                fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
 470                /* DA BSSID SA */
 471                memcpy(hdr.addr1, skb->data, ETH_ALEN);
 472                memcpy(hdr.addr2, addr, ETH_ALEN);
 473                memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
 474                hdrlen = 24;
 475                break;
 476        case NL80211_IFTYPE_STATION:
 477        case NL80211_IFTYPE_P2P_CLIENT:
 478                fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
 479                /* BSSID SA DA */
 480                memcpy(hdr.addr1, bssid, ETH_ALEN);
 481                memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 482                memcpy(hdr.addr3, skb->data, ETH_ALEN);
 483                hdrlen = 24;
 484                break;
 485        case NL80211_IFTYPE_ADHOC:
 486                /* DA SA BSSID */
 487                memcpy(hdr.addr1, skb->data, ETH_ALEN);
 488                memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
 489                memcpy(hdr.addr3, bssid, ETH_ALEN);
 490                hdrlen = 24;
 491                break;
 492        default:
 493                return -EOPNOTSUPP;
 494        }
 495
 496        if (qos) {
 497                fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 498                hdrlen += 2;
 499        }
 500
 501        hdr.frame_control = fc;
 502        hdr.duration_id = 0;
 503        hdr.seq_ctrl = 0;
 504
 505        skip_header_bytes = ETH_HLEN;
 506        if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
 507                encaps_data = bridge_tunnel_header;
 508                encaps_len = sizeof(bridge_tunnel_header);
 509                skip_header_bytes -= 2;
 510        } else if (ethertype > 0x600) {
 511                encaps_data = rfc1042_header;
 512                encaps_len = sizeof(rfc1042_header);
 513                skip_header_bytes -= 2;
 514        } else {
 515                encaps_data = NULL;
 516                encaps_len = 0;
 517        }
 518
 519        skb_pull(skb, skip_header_bytes);
 520        nh_pos -= skip_header_bytes;
 521        h_pos -= skip_header_bytes;
 522
 523        head_need = hdrlen + encaps_len - skb_headroom(skb);
 524
 525        if (head_need > 0 || skb_cloned(skb)) {
 526                head_need = max(head_need, 0);
 527                if (head_need)
 528                        skb_orphan(skb);
 529
 530                if (pskb_expand_head(skb, head_need, 0, GFP_ATOMIC))
 531                        return -ENOMEM;
 532
 533                skb->truesize += head_need;
 534        }
 535
 536        if (encaps_data) {
 537                memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 538                nh_pos += encaps_len;
 539                h_pos += encaps_len;
 540        }
 541
 542        memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 543
 544        nh_pos += hdrlen;
 545        h_pos += hdrlen;
 546
 547        /* Update skb pointers to various headers since this modified frame
 548         * is going to go through Linux networking code that may potentially
 549         * need things like pointer to IP header. */
 550        skb_set_mac_header(skb, 0);
 551        skb_set_network_header(skb, nh_pos);
 552        skb_set_transport_header(skb, h_pos);
 553
 554        return 0;
 555}
 556EXPORT_SYMBOL(ieee80211_data_from_8023);
 557
 558
 559void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
 560                              const u8 *addr, enum nl80211_iftype iftype,
 561                              const unsigned int extra_headroom,
 562                              bool has_80211_header)
 563{
 564        struct sk_buff *frame = NULL;
 565        u16 ethertype;
 566        u8 *payload;
 567        const struct ethhdr *eth;
 568        int remaining, err;
 569        u8 dst[ETH_ALEN], src[ETH_ALEN];
 570
 571        if (has_80211_header) {
 572                err = ieee80211_data_to_8023(skb, addr, iftype);
 573                if (err)
 574                        goto out;
 575
 576                /* skip the wrapping header */
 577                eth = (struct ethhdr *) skb_pull(skb, sizeof(struct ethhdr));
 578                if (!eth)
 579                        goto out;
 580        } else {
 581                eth = (struct ethhdr *) skb->data;
 582        }
 583
 584        while (skb != frame) {
 585                u8 padding;
 586                __be16 len = eth->h_proto;
 587                unsigned int subframe_len = sizeof(struct ethhdr) + ntohs(len);
 588
 589                remaining = skb->len;
 590                memcpy(dst, eth->h_dest, ETH_ALEN);
 591                memcpy(src, eth->h_source, ETH_ALEN);
 592
 593                padding = (4 - subframe_len) & 0x3;
 594                /* the last MSDU has no padding */
 595                if (subframe_len > remaining)
 596                        goto purge;
 597
 598                skb_pull(skb, sizeof(struct ethhdr));
 599                /* reuse skb for the last subframe */
 600                if (remaining <= subframe_len + padding)
 601                        frame = skb;
 602                else {
 603                        unsigned int hlen = ALIGN(extra_headroom, 4);
 604                        /*
 605                         * Allocate and reserve two bytes more for payload
 606                         * alignment since sizeof(struct ethhdr) is 14.
 607                         */
 608                        frame = dev_alloc_skb(hlen + subframe_len + 2);
 609                        if (!frame)
 610                                goto purge;
 611
 612                        skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
 613                        memcpy(skb_put(frame, ntohs(len)), skb->data,
 614                                ntohs(len));
 615
 616                        eth = (struct ethhdr *)skb_pull(skb, ntohs(len) +
 617                                                        padding);
 618                        if (!eth) {
 619                                dev_kfree_skb(frame);
 620                                goto purge;
 621                        }
 622                }
 623
 624                skb_reset_network_header(frame);
 625                frame->dev = skb->dev;
 626                frame->priority = skb->priority;
 627
 628                payload = frame->data;
 629                ethertype = (payload[6] << 8) | payload[7];
 630
 631                if (likely((ether_addr_equal(payload, rfc1042_header) &&
 632                            ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
 633                           ether_addr_equal(payload, bridge_tunnel_header))) {
 634                        /* remove RFC1042 or Bridge-Tunnel
 635                         * encapsulation and replace EtherType */
 636                        skb_pull(frame, 6);
 637                        memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 638                        memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 639                } else {
 640                        memcpy(skb_push(frame, sizeof(__be16)), &len,
 641                                sizeof(__be16));
 642                        memcpy(skb_push(frame, ETH_ALEN), src, ETH_ALEN);
 643                        memcpy(skb_push(frame, ETH_ALEN), dst, ETH_ALEN);
 644                }
 645                __skb_queue_tail(list, frame);
 646        }
 647
 648        return;
 649
 650 purge:
 651        __skb_queue_purge(list);
 652 out:
 653        dev_kfree_skb(skb);
 654}
 655EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
 656
 657/* Given a data frame determine the 802.1p/1d tag to use. */
 658unsigned int cfg80211_classify8021d(struct sk_buff *skb)
 659{
 660        unsigned int dscp;
 661
 662        /* skb->priority values from 256->263 are magic values to
 663         * directly indicate a specific 802.1d priority.  This is used
 664         * to allow 802.1d priority to be passed directly in from VLAN
 665         * tags, etc.
 666         */
 667        if (skb->priority >= 256 && skb->priority <= 263)
 668                return skb->priority - 256;
 669
 670        switch (skb->protocol) {
 671        case htons(ETH_P_IP):
 672                dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
 673                break;
 674        case htons(ETH_P_IPV6):
 675                dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
 676                break;
 677        default:
 678                return 0;
 679        }
 680
 681        return dscp >> 5;
 682}
 683EXPORT_SYMBOL(cfg80211_classify8021d);
 684
 685const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
 686{
 687        u8 *end, *pos;
 688
 689        pos = bss->information_elements;
 690        if (pos == NULL)
 691                return NULL;
 692        end = pos + bss->len_information_elements;
 693
 694        while (pos + 1 < end) {
 695                if (pos + 2 + pos[1] > end)
 696                        break;
 697                if (pos[0] == ie)
 698                        return pos;
 699                pos += 2 + pos[1];
 700        }
 701
 702        return NULL;
 703}
 704EXPORT_SYMBOL(ieee80211_bss_get_ie);
 705
 706void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
 707{
 708        struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
 709        struct net_device *dev = wdev->netdev;
 710        int i;
 711
 712        if (!wdev->connect_keys)
 713                return;
 714
 715        for (i = 0; i < 6; i++) {
 716                if (!wdev->connect_keys->params[i].cipher)
 717                        continue;
 718                if (rdev->ops->add_key(wdev->wiphy, dev, i, false, NULL,
 719                                        &wdev->connect_keys->params[i])) {
 720                        netdev_err(dev, "failed to set key %d\n", i);
 721                        continue;
 722                }
 723                if (wdev->connect_keys->def == i)
 724                        if (rdev->ops->set_default_key(wdev->wiphy, dev,
 725                                                       i, true, true)) {
 726                                netdev_err(dev, "failed to set defkey %d\n", i);
 727                                continue;
 728                        }
 729                if (wdev->connect_keys->defmgmt == i)
 730                        if (rdev->ops->set_default_mgmt_key(wdev->wiphy, dev, i))
 731                                netdev_err(dev, "failed to set mgtdef %d\n", i);
 732        }
 733
 734        kfree(wdev->connect_keys);
 735        wdev->connect_keys = NULL;
 736}
 737
 738void cfg80211_process_wdev_events(struct wireless_dev *wdev)
 739{
 740        struct cfg80211_event *ev;
 741        unsigned long flags;
 742        const u8 *bssid = NULL;
 743
 744        spin_lock_irqsave(&wdev->event_lock, flags);
 745        while (!list_empty(&wdev->event_list)) {
 746                ev = list_first_entry(&wdev->event_list,
 747                                      struct cfg80211_event, list);
 748                list_del(&ev->list);
 749                spin_unlock_irqrestore(&wdev->event_lock, flags);
 750
 751                wdev_lock(wdev);
 752                switch (ev->type) {
 753                case EVENT_CONNECT_RESULT:
 754                        if (!is_zero_ether_addr(ev->cr.bssid))
 755                                bssid = ev->cr.bssid;
 756                        __cfg80211_connect_result(
 757                                wdev->netdev, bssid,
 758                                ev->cr.req_ie, ev->cr.req_ie_len,
 759                                ev->cr.resp_ie, ev->cr.resp_ie_len,
 760                                ev->cr.status,
 761                                ev->cr.status == WLAN_STATUS_SUCCESS,
 762                                NULL);
 763                        break;
 764                case EVENT_ROAMED:
 765                        __cfg80211_roamed(wdev, ev->rm.bss, ev->rm.req_ie,
 766                                          ev->rm.req_ie_len, ev->rm.resp_ie,
 767                                          ev->rm.resp_ie_len);
 768                        break;
 769                case EVENT_DISCONNECTED:
 770                        __cfg80211_disconnected(wdev->netdev,
 771                                                ev->dc.ie, ev->dc.ie_len,
 772                                                ev->dc.reason, true);
 773                        break;
 774                case EVENT_IBSS_JOINED:
 775                        __cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid);
 776                        break;
 777                }
 778                wdev_unlock(wdev);
 779
 780                kfree(ev);
 781
 782                spin_lock_irqsave(&wdev->event_lock, flags);
 783        }
 784        spin_unlock_irqrestore(&wdev->event_lock, flags);
 785}
 786
 787void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
 788{
 789        struct wireless_dev *wdev;
 790
 791        ASSERT_RTNL();
 792        ASSERT_RDEV_LOCK(rdev);
 793
 794        mutex_lock(&rdev->devlist_mtx);
 795
 796        list_for_each_entry(wdev, &rdev->wdev_list, list)
 797                cfg80211_process_wdev_events(wdev);
 798
 799        mutex_unlock(&rdev->devlist_mtx);
 800}
 801
 802int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
 803                          struct net_device *dev, enum nl80211_iftype ntype,
 804                          u32 *flags, struct vif_params *params)
 805{
 806        int err;
 807        enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
 808
 809        ASSERT_RDEV_LOCK(rdev);
 810
 811        /* don't support changing VLANs, you just re-create them */
 812        if (otype == NL80211_IFTYPE_AP_VLAN)
 813                return -EOPNOTSUPP;
 814
 815        if (!rdev->ops->change_virtual_intf ||
 816            !(rdev->wiphy.interface_modes & (1 << ntype)))
 817                return -EOPNOTSUPP;
 818
 819        /* if it's part of a bridge, reject changing type to station/ibss */
 820        if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
 821            (ntype == NL80211_IFTYPE_ADHOC ||
 822             ntype == NL80211_IFTYPE_STATION ||
 823             ntype == NL80211_IFTYPE_P2P_CLIENT))
 824                return -EBUSY;
 825
 826        if (ntype != otype && netif_running(dev)) {
 827                mutex_lock(&rdev->devlist_mtx);
 828                err = cfg80211_can_change_interface(rdev, dev->ieee80211_ptr,
 829                                                    ntype);
 830                mutex_unlock(&rdev->devlist_mtx);
 831                if (err)
 832                        return err;
 833
 834                dev->ieee80211_ptr->use_4addr = false;
 835                dev->ieee80211_ptr->mesh_id_up_len = 0;
 836
 837                switch (otype) {
 838                case NL80211_IFTYPE_AP:
 839                        cfg80211_stop_ap(rdev, dev);
 840                        break;
 841                case NL80211_IFTYPE_ADHOC:
 842                        cfg80211_leave_ibss(rdev, dev, false);
 843                        break;
 844                case NL80211_IFTYPE_STATION:
 845                case NL80211_IFTYPE_P2P_CLIENT:
 846                        cfg80211_disconnect(rdev, dev,
 847                                            WLAN_REASON_DEAUTH_LEAVING, true);
 848                        break;
 849                case NL80211_IFTYPE_MESH_POINT:
 850                        /* mesh should be handled? */
 851                        break;
 852                default:
 853                        break;
 854                }
 855
 856                cfg80211_process_rdev_events(rdev);
 857        }
 858
 859        err = rdev->ops->change_virtual_intf(&rdev->wiphy, dev,
 860                                             ntype, flags, params);
 861
 862        WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
 863
 864        if (!err && params && params->use_4addr != -1)
 865                dev->ieee80211_ptr->use_4addr = params->use_4addr;
 866
 867        if (!err) {
 868                dev->priv_flags &= ~IFF_DONT_BRIDGE;
 869                switch (ntype) {
 870                case NL80211_IFTYPE_STATION:
 871                        if (dev->ieee80211_ptr->use_4addr)
 872                                break;
 873                        /* fall through */
 874                case NL80211_IFTYPE_P2P_CLIENT:
 875                case NL80211_IFTYPE_ADHOC:
 876                        dev->priv_flags |= IFF_DONT_BRIDGE;
 877                        break;
 878                case NL80211_IFTYPE_P2P_GO:
 879                case NL80211_IFTYPE_AP:
 880                case NL80211_IFTYPE_AP_VLAN:
 881                case NL80211_IFTYPE_WDS:
 882                case NL80211_IFTYPE_MESH_POINT:
 883                        /* bridging OK */
 884                        break;
 885                case NL80211_IFTYPE_MONITOR:
 886                        /* monitor can't bridge anyway */
 887                        break;
 888                case NL80211_IFTYPE_UNSPECIFIED:
 889                case NUM_NL80211_IFTYPES:
 890                        /* not happening */
 891                        break;
 892                }
 893        }
 894
 895        if (!err && ntype != otype && netif_running(dev)) {
 896                cfg80211_update_iface_num(rdev, ntype, 1);
 897                cfg80211_update_iface_num(rdev, otype, -1);
 898        }
 899
 900        return err;
 901}
 902
 903static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
 904{
 905        static const u32 __mcs2bitrate[] = {
 906                /* control PHY */
 907                [0] =   275,
 908                /* SC PHY */
 909                [1] =  3850,
 910                [2] =  7700,
 911                [3] =  9625,
 912                [4] = 11550,
 913                [5] = 12512, /* 1251.25 mbps */
 914                [6] = 15400,
 915                [7] = 19250,
 916                [8] = 23100,
 917                [9] = 25025,
 918                [10] = 30800,
 919                [11] = 38500,
 920                [12] = 46200,
 921                /* OFDM PHY */
 922                [13] =  6930,
 923                [14] =  8662, /* 866.25 mbps */
 924                [15] = 13860,
 925                [16] = 17325,
 926                [17] = 20790,
 927                [18] = 27720,
 928                [19] = 34650,
 929                [20] = 41580,
 930                [21] = 45045,
 931                [22] = 51975,
 932                [23] = 62370,
 933                [24] = 67568, /* 6756.75 mbps */
 934                /* LP-SC PHY */
 935                [25] =  6260,
 936                [26] =  8340,
 937                [27] = 11120,
 938                [28] = 12510,
 939                [29] = 16680,
 940                [30] = 22240,
 941                [31] = 25030,
 942        };
 943
 944        if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
 945                return 0;
 946
 947        return __mcs2bitrate[rate->mcs];
 948}
 949
 950u32 cfg80211_calculate_bitrate(struct rate_info *rate)
 951{
 952        int modulation, streams, bitrate;
 953
 954        if (!(rate->flags & RATE_INFO_FLAGS_MCS))
 955                return rate->legacy;
 956        if (rate->flags & RATE_INFO_FLAGS_60G)
 957                return cfg80211_calculate_bitrate_60g(rate);
 958
 959        /* the formula below does only work for MCS values smaller than 32 */
 960        if (WARN_ON_ONCE(rate->mcs >= 32))
 961                return 0;
 962
 963        modulation = rate->mcs & 7;
 964        streams = (rate->mcs >> 3) + 1;
 965
 966        bitrate = (rate->flags & RATE_INFO_FLAGS_40_MHZ_WIDTH) ?
 967                        13500000 : 6500000;
 968
 969        if (modulation < 4)
 970                bitrate *= (modulation + 1);
 971        else if (modulation == 4)
 972                bitrate *= (modulation + 2);
 973        else
 974                bitrate *= (modulation + 3);
 975
 976        bitrate *= streams;
 977
 978        if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
 979                bitrate = (bitrate / 9) * 10;
 980
 981        /* do NOT round down here */
 982        return (bitrate + 50000) / 100000;
 983}
 984EXPORT_SYMBOL(cfg80211_calculate_bitrate);
 985
 986int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
 987                                 u32 beacon_int)
 988{
 989        struct wireless_dev *wdev;
 990        int res = 0;
 991
 992        if (!beacon_int)
 993                return -EINVAL;
 994
 995        mutex_lock(&rdev->devlist_mtx);
 996
 997        list_for_each_entry(wdev, &rdev->wdev_list, list) {
 998                if (!wdev->beacon_interval)
 999                        continue;
1000                if (wdev->beacon_interval != beacon_int) {
1001                        res = -EINVAL;
1002                        break;
1003                }
1004        }
1005
1006        mutex_unlock(&rdev->devlist_mtx);
1007
1008        return res;
1009}
1010
1011int cfg80211_can_use_iftype_chan(struct cfg80211_registered_device *rdev,
1012                                 struct wireless_dev *wdev,
1013                                 enum nl80211_iftype iftype,
1014                                 struct ieee80211_channel *chan,
1015                                 enum cfg80211_chan_mode chanmode)
1016{
1017        struct wireless_dev *wdev_iter;
1018        u32 used_iftypes = BIT(iftype);
1019        int num[NUM_NL80211_IFTYPES];
1020        struct ieee80211_channel
1021                        *used_channels[CFG80211_MAX_NUM_DIFFERENT_CHANNELS];
1022        struct ieee80211_channel *ch;
1023        enum cfg80211_chan_mode chmode;
1024        int num_different_channels = 0;
1025        int total = 1;
1026        int i, j;
1027
1028        ASSERT_RTNL();
1029        lockdep_assert_held(&rdev->devlist_mtx);
1030
1031        /* Always allow software iftypes */
1032        if (rdev->wiphy.software_iftypes & BIT(iftype))
1033                return 0;
1034
1035        memset(num, 0, sizeof(num));
1036        memset(used_channels, 0, sizeof(used_channels));
1037
1038        num[iftype] = 1;
1039
1040        switch (chanmode) {
1041        case CHAN_MODE_UNDEFINED:
1042                break;
1043        case CHAN_MODE_SHARED:
1044                WARN_ON(!chan);
1045                used_channels[0] = chan;
1046                num_different_channels++;
1047                break;
1048        case CHAN_MODE_EXCLUSIVE:
1049                num_different_channels++;
1050                break;
1051        }
1052
1053        list_for_each_entry(wdev_iter, &rdev->wdev_list, list) {
1054                if (wdev_iter == wdev)
1055                        continue;
1056                if (!netif_running(wdev_iter->netdev))
1057                        continue;
1058
1059                if (rdev->wiphy.software_iftypes & BIT(wdev_iter->iftype))
1060                        continue;
1061
1062                /*
1063                 * We may be holding the "wdev" mutex, but now need to lock
1064                 * wdev_iter. This is OK because once we get here wdev_iter
1065                 * is not wdev (tested above), but we need to use the nested
1066                 * locking for lockdep.
1067                 */
1068                mutex_lock_nested(&wdev_iter->mtx, 1);
1069                __acquire(wdev_iter->mtx);
1070                cfg80211_get_chan_state(wdev_iter, &ch, &chmode);
1071                wdev_unlock(wdev_iter);
1072
1073                switch (chmode) {
1074                case CHAN_MODE_UNDEFINED:
1075                        break;
1076                case CHAN_MODE_SHARED:
1077                        for (i = 0; i < CFG80211_MAX_NUM_DIFFERENT_CHANNELS; i++)
1078                                if (!used_channels[i] || used_channels[i] == ch)
1079                                        break;
1080
1081                        if (i == CFG80211_MAX_NUM_DIFFERENT_CHANNELS)
1082                                return -EBUSY;
1083
1084                        if (used_channels[i] == NULL) {
1085                                used_channels[i] = ch;
1086                                num_different_channels++;
1087                        }
1088                        break;
1089                case CHAN_MODE_EXCLUSIVE:
1090                        num_different_channels++;
1091                        break;
1092                }
1093
1094                num[wdev_iter->iftype]++;
1095                total++;
1096                used_iftypes |= BIT(wdev_iter->iftype);
1097        }
1098
1099        if (total == 1)
1100                return 0;
1101
1102        for (i = 0; i < rdev->wiphy.n_iface_combinations; i++) {
1103                const struct ieee80211_iface_combination *c;
1104                struct ieee80211_iface_limit *limits;
1105                u32 all_iftypes = 0;
1106
1107                c = &rdev->wiphy.iface_combinations[i];
1108
1109                if (total > c->max_interfaces)
1110                        continue;
1111                if (num_different_channels > c->num_different_channels)
1112                        continue;
1113
1114                limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
1115                                 GFP_KERNEL);
1116                if (!limits)
1117                        return -ENOMEM;
1118
1119                for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
1120                        if (rdev->wiphy.software_iftypes & BIT(iftype))
1121                                continue;
1122                        for (j = 0; j < c->n_limits; j++) {
1123                                all_iftypes |= limits[j].types;
1124                                if (!(limits[j].types & BIT(iftype)))
1125                                        continue;
1126                                if (limits[j].max < num[iftype])
1127                                        goto cont;
1128                                limits[j].max -= num[iftype];
1129                        }
1130                }
1131
1132                /*
1133                 * Finally check that all iftypes that we're currently
1134                 * using are actually part of this combination. If they
1135                 * aren't then we can't use this combination and have
1136                 * to continue to the next.
1137                 */
1138                if ((all_iftypes & used_iftypes) != used_iftypes)
1139                        goto cont;
1140
1141                /*
1142                 * This combination covered all interface types and
1143                 * supported the requested numbers, so we're good.
1144                 */
1145                kfree(limits);
1146                return 0;
1147 cont:
1148                kfree(limits);
1149        }
1150
1151        return -EBUSY;
1152}
1153
1154int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
1155                           const u8 *rates, unsigned int n_rates,
1156                           u32 *mask)
1157{
1158        int i, j;
1159
1160        if (!sband)
1161                return -EINVAL;
1162
1163        if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
1164                return -EINVAL;
1165
1166        *mask = 0;
1167
1168        for (i = 0; i < n_rates; i++) {
1169                int rate = (rates[i] & 0x7f) * 5;
1170                bool found = false;
1171
1172                for (j = 0; j < sband->n_bitrates; j++) {
1173                        if (sband->bitrates[j].bitrate == rate) {
1174                                found = true;
1175                                *mask |= BIT(j);
1176                                break;
1177                        }
1178                }
1179                if (!found)
1180                        return -EINVAL;
1181        }
1182
1183        /*
1184         * mask must have at least one bit set here since we
1185         * didn't accept a 0-length rates array nor allowed
1186         * entries in the array that didn't exist
1187         */
1188
1189        return 0;
1190}
1191
1192/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
1193/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
1194const unsigned char rfc1042_header[] __aligned(2) =
1195        { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
1196EXPORT_SYMBOL(rfc1042_header);
1197
1198/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
1199const unsigned char bridge_tunnel_header[] __aligned(2) =
1200        { 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
1201EXPORT_SYMBOL(bridge_tunnel_header);
1202
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