crossdriver/bcmwifi_channels.cc

/* Crossdriver (bcmdhd/brcmfmac) logic extracted from bcmdhd bcmwifi_channels.c.
 *
 * Copyright 1999-2016, Broadcom Corporation
 * All rights reserved,
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *    1. Redistributions of source code must retain the above copyright notice,
 *       this list of conditions and the following disclaimer.
 *    2. Redistributions in binary form must reproduce the above copyright notice,
 *       this list of conditions and the following disclaimer in the documentation
 *       and/or other materials provided with the distribution.
 *
 * This software is provided by the copyright holder "as is" and any express or
 * implied warranties, including, but not limited to, the implied warranties of
 * merchantability and fitness for a particular purpose are disclaimed. In no event
 * shall copyright holder be liable for any direct, indirect, incidental, special,
 * exemplary, or consequential damages (including, but not limited to, procurement
 * of substitute goods or services; loss of use, data, or profits; or business
 * interruption) however caused and on any theory of liability, whether in
 * contract, strict liability, or tort (including negligence or otherwise) arising
 * in any way out of the use of this software, even if advised of the possibility
 * of such damage
 */

#include "bcmwifi_channels.h"

bool chspec_malformed(chanspec_t chanspec) {
  uint16_t chspec_bw = CHSPEC_BW(chanspec);
  uint16_t chspec_ch = CHSPEC_CHANNEL(chanspec);

  /* must be 2G or 5G band */
  if (CHSPEC_IS2G(chanspec)) {
    /* must be valid bandwidth */
    if (!BW_LE40(chspec_bw)) {
      return true;
    }
  } else if (CHSPEC_IS5G(chanspec)) {
    if (chspec_bw == WL_CHANSPEC_BW_8080) {
      uint16_t ch1_id, ch2_id;

      /* channel IDs in 80+80 must be in range */
      ch1_id = CHSPEC_CHAN1(chanspec);
      ch2_id = CHSPEC_CHAN2(chanspec);
      if (ch1_id >= WF_NUM_5G_80M_CHANS || ch2_id >= WF_NUM_5G_80M_CHANS)
        return true;

    } else if (BW_LE160(chspec_bw)) {
      if (chspec_ch > MAXCHANNEL) {
        return true;
      }
    } else {
      /* invalid bandwidth */
      return true;
    }
  } else {
    /* must be 2G or 5G band */
    return true;
  }

  /* side band needs to be consistent with bandwidth */
  if (BW_LE20(chspec_bw)) {
    if (CHSPEC_CTL_SB(chanspec) != WL_CHANSPEC_CTL_SB_LLL)
      return true;
  } else if (chspec_bw == WL_CHANSPEC_BW_40) {
    if (CHSPEC_CTL_SB(chanspec) > WL_CHANSPEC_CTL_SB_LLU)
      return true;
  } else if (chspec_bw == WL_CHANSPEC_BW_80 || chspec_bw == WL_CHANSPEC_BW_8080) {
    if (CHSPEC_CTL_SB(chanspec) > WL_CHANSPEC_CTL_SB_LUU)
      return true;
  } else if (chspec_bw == WL_CHANSPEC_BW_160) {
    // This condition was originally an assertion, which is inverted here.
    // Assertion was: ASSERT(CHSPEC_CTL_SB(chanspec) <= WL_CHANSPEC_CTL_SB_UUU);
    if (CHSPEC_CTL_SB(chanspec) > WL_CHANSPEC_CTL_SB_UUU) {
      return true;
    }
  }
  return false;
}