xref: /openbmc/linux/net/mac80211/eht.c (revision 1ec7291e)
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
ieee80211_eht_cap_ie_to_sta_eht_cap(struct ieee80211_sub_if_data * sdata,struct ieee80211_supported_band * sband,const u8 * he_cap_ie,u8 he_cap_len,const struct ieee80211_eht_cap_elem * eht_cap_ie_elem,u8 eht_cap_len,struct link_sta_info * link_sta)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 }
79