net/mac80211/eht.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * EHT handling
   4  *
   5  * Copyright(c) 2021-2023 Intel Corporation
   6  */
   7
   8 #include "ieee80211_i.h"
   9
  10 void
  11 ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data *sdata,
  12                                     struct ieee80211_supported_band *sband,
  13                                     const u8 *he_cap_ie, u8 he_cap_len,
  14                                     const struct ieee80211_eht_cap_elem *eht_cap_ie_elem,
  15                                     u8 eht_cap_len,
  16                                     struct link_sta_info *link_sta)
  17 {
  18         struct ieee80211_sta_eht_cap *eht_cap = &link_sta->pub->eht_cap;
  19         struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
  20         u8 eht_ppe_size = 0;
  21         u8 mcs_nss_size;
  22         u8 eht_total_size = sizeof(eht_cap->eht_cap_elem);
  23         u8 *pos = (u8 *)eht_cap_ie_elem;
  24
  25         memset(eht_cap, 0, sizeof(*eht_cap));
  26
  27         if (!eht_cap_ie_elem ||
  28             !ieee80211_get_eht_iftype_cap_vif(sband, &sdata->vif))
  29                 return;
  30
  31         mcs_nss_size = ieee80211_eht_mcs_nss_size(he_cap_ie_elem,
  32                                                   &eht_cap_ie_elem->fixed,
  33                                                   sdata->vif.type ==
  34                                                         NL80211_IFTYPE_STATION);
  35
  36         eht_total_size += mcs_nss_size;
  37
  38         /* Calculate the PPE thresholds length only if the header is present */
  39         if (eht_cap_ie_elem->fixed.phy_cap_info[5] &
  40                         IEEE80211_EHT_PHY_CAP5_PPE_THRESHOLD_PRESENT) {
  41                 u16 eht_ppe_hdr;
  42
  43                 if (eht_cap_len < eht_total_size + sizeof(u16))
  44                         return;
  45
  46                 eht_ppe_hdr = get_unaligned_le16(eht_cap_ie_elem->optional + mcs_nss_size);
  47                 eht_ppe_size =
  48                         ieee80211_eht_ppe_size(eht_ppe_hdr,
  49                                                eht_cap_ie_elem->fixed.phy_cap_info);
  50                 eht_total_size += eht_ppe_size;
  51
  52                 /* we calculate as if NSS > 8 are valid, but don't handle that */
  53                 if (eht_ppe_size > sizeof(eht_cap->eht_ppe_thres))
  54                         return;
  55         }
  56
  57         if (eht_cap_len < eht_total_size)
  58                 return;
  59
  60         /* Copy the static portion of the EHT capabilities */
  61         memcpy(&eht_cap->eht_cap_elem, pos, sizeof(eht_cap->eht_cap_elem));
  62         pos += sizeof(eht_cap->eht_cap_elem);
  63
  64         /* Copy MCS/NSS which depends on the peer capabilities */
  65         memset(&eht_cap->eht_mcs_nss_supp, 0,
  66                sizeof(eht_cap->eht_mcs_nss_supp));
  67         memcpy(&eht_cap->eht_mcs_nss_supp, pos, mcs_nss_size);
  68
  69         if (eht_ppe_size)
  70                 memcpy(eht_cap->eht_ppe_thres,
  71                        &eht_cap_ie_elem->optional[mcs_nss_size],
  72                        eht_ppe_size);
  73
  74         eht_cap->has_eht = true;
  75
  76         link_sta->cur_max_bandwidth = ieee80211_sta_cap_rx_bw(link_sta);
  77         link_sta->pub->bandwidth = ieee80211_sta_cur_vht_bw(link_sta);
  78 }