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ieee80211: add code to obtain and parse 6 GHz operation field 

Add some code to obtain and parse the 6 GHz operation field
inside the HE operation element.

While at it, fix the required length using sizeof() the new
struct, which is 5 instead of 4 now.

Link: https://lore.kernel.org/r/20200528213443.42ca72c45ca9.Id74bc1b03da9ea6574f9bc70deeb60dfc1634359@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2020-05-28 21:34:27 +02:00
parent 372b38ea59
commit 821273a5a5
1 changed files with 51 additions and 1 deletions
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52
include/linux/ieee80211.h
View File

@ -2209,6 +2209,28 @@ ieee80211_he_ppe_size(u8 ppe_thres_hdr, const u8 *phy_cap_info)
#define IEEE80211_HE_OPERATION_PARTIAL_BSS_COLOR 0x40000000
#define IEEE80211_HE_OPERATION_BSS_COLOR_DISABLED 0x80000000
/**
* ieee80211_he_6ghz_oper - HE 6 GHz operation Information field
* @primary: primary channel
* @control: control flags
* @ccfs0: channel center frequency segment 0
* @ccfs1: channel center frequency segment 1
* @minrate: minimum rate (in 1 Mbps units)
*/
struct ieee80211_he_6ghz_oper {
u8 primary;
#define IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH 0x3
#define IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_20MHZ 0
#define IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_40MHZ 1
#define IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_80MHZ 2
#define IEEE80211_HE_6GHZ_OPER_CTRL_CHANWIDTH_160MHZ 3
#define IEEE80211_HE_6GHZ_OPER_CTRL_DUP_BEACON 0x4
u8 control;
u8 ccfs0;
u8 ccfs1;
u8 minrate;
} __packed;
/*
* ieee80211_he_oper_size - calculate 802.11ax HE Operations IE size
* @he_oper_ie: byte data of the He Operations IE, stating from the byte
@ -2235,7 +2257,7 @@ ieee80211_he_oper_size(const u8 *he_oper_ie)
if (he_oper_params & IEEE80211_HE_OPERATION_CO_HOSTED_BSS)
oper_len++;
if (he_oper_params & IEEE80211_HE_OPERATION_6GHZ_OP_INFO)
oper_len += 4;
oper_len += sizeof(struct ieee80211_he_6ghz_oper);
/* Add the first byte (extension ID) to the total length */
oper_len++;
@ -2243,6 +2265,34 @@ ieee80211_he_oper_size(const u8 *he_oper_ie)
return oper_len;
}
/**
* ieee80211_he_6ghz_oper - obtain 6 GHz operation field
* @he_oper: HE operation element (must be pre-validated for size)
* but may be %NULL
*
* Return: a pointer to the 6 GHz operation field, or %NULL
*/
static inline const struct ieee80211_he_6ghz_oper *
ieee80211_he_6ghz_oper(const struct ieee80211_he_operation *he_oper)
{
const u8 *ret = (void *)&he_oper->optional;
u32 he_oper_params;
if (!he_oper)
return NULL;
he_oper_params = le32_to_cpu(he_oper->he_oper_params);
if (!(he_oper_params & IEEE80211_HE_OPERATION_6GHZ_OP_INFO))
return NULL;
if (he_oper_params & IEEE80211_HE_OPERATION_VHT_OPER_INFO)
ret += 3;
if (he_oper_params & IEEE80211_HE_OPERATION_CO_HOSTED_BSS)
ret++;
return (void *)ret;
}
/* HE Spatial Reuse defines */
#define IEEE80211_HE_SPR_NON_SRG_OFFSET_PRESENT 0x4
#define IEEE80211_HE_SPR_SRG_INFORMATION_PRESENT 0x8