cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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eht.c (2268B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * EHT handling
      4 *
      5 * Copyright(c) 2021-2022 Intel Corporation
      6 */
      7
      8#include "ieee80211_i.h"
      9
     10void
     11ieee80211_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, struct sta_info *sta)
     16{
     17	struct ieee80211_sta_eht_cap *eht_cap = &sta->sta.deflink.eht_cap;
     18	struct ieee80211_he_cap_elem *he_cap_ie_elem = (void *)he_cap_ie;
     19	u8 eht_ppe_size = 0;
     20	u8 mcs_nss_size;
     21	u8 eht_total_size = sizeof(eht_cap->eht_cap_elem);
     22	u8 *pos = (u8 *)eht_cap_ie_elem;
     23
     24	memset(eht_cap, 0, sizeof(*eht_cap));
     25
     26	if (!eht_cap_ie_elem ||
     27	    !ieee80211_get_eht_iftype_cap(sband,
     28					 ieee80211_vif_type_p2p(&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
     34	eht_total_size += mcs_nss_size;
     35
     36	/* Calculate the PPE thresholds length only if the header is present */
     37	if (eht_cap_ie_elem->fixed.phy_cap_info[5] &
     38			IEEE80211_EHT_PHY_CAP5_PPE_THRESHOLD_PRESENT) {
     39		u16 eht_ppe_hdr;
     40
     41		if (eht_cap_len < eht_total_size + sizeof(u16))
     42			return;
     43
     44		eht_ppe_hdr = get_unaligned_le16(eht_cap_ie_elem->optional + mcs_nss_size);
     45		eht_ppe_size =
     46			ieee80211_eht_ppe_size(eht_ppe_hdr,
     47					       eht_cap_ie_elem->fixed.phy_cap_info);
     48		eht_total_size += eht_ppe_size;
     49
     50		/* we calculate as if NSS > 8 are valid, but don't handle that */
     51		if (eht_ppe_size > sizeof(eht_cap->eht_ppe_thres))
     52			return;
     53	}
     54
     55	if (eht_cap_len < eht_total_size)
     56		return;
     57
     58	/* Copy the static portion of the EHT capabilities */
     59	memcpy(&eht_cap->eht_cap_elem, pos, sizeof(eht_cap->eht_cap_elem));
     60	pos += sizeof(eht_cap->eht_cap_elem);
     61
     62	/* Copy MCS/NSS which depends on the peer capabilities */
     63	memset(&eht_cap->eht_mcs_nss_supp, 0,
     64	       sizeof(eht_cap->eht_mcs_nss_supp));
     65	memcpy(&eht_cap->eht_mcs_nss_supp, pos, mcs_nss_size);
     66
     67	if (eht_ppe_size)
     68		memcpy(eht_cap->eht_ppe_thres,
     69		       &eht_cap_ie_elem->optional[mcs_nss_size],
     70		       eht_ppe_size);
     71
     72	eht_cap->has_eht = true;
     73
     74	sta->deflink.cur_max_bandwidth = ieee80211_sta_cap_rx_bw(sta);
     75	sta->sta.deflink.bandwidth = ieee80211_sta_cur_vht_bw(sta);
     76}