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cfg80211: separate get channel number from ies

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Get channel number from ies is a common logic, so separate it to a new
function, which could also be used by lower driver.

Signed-off-by: Wen Gong <wgong@codeaurora.org>
Link: https://lore.kernel.org/r/20210930081533.4898-1-wgong@codeaurora.org
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Wen Gong 2021-09-30 04:15:33 -04:00 committed by Johannes Berg
parent f2622138f9
commit 97981d89a1
2 changed files with 37 additions and 15 deletions
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11
include/net/cfg80211.h
View File

@ -6376,6 +6376,17 @@ static inline void cfg80211_gen_new_bssid(const u8 *bssid, u8 max_bssid,
u64_to_ether_addr(new_bssid_u64, new_bssid);
}
/**
* cfg80211_get_ies_channel_number - returns the channel number from ies
* @ie: IEs
* @ielen: length of IEs
* @band: enum nl80211_band of the channel
*
* Returns the channel number, or -1 if none could be determined.
*/
int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
enum nl80211_band band);
/**
* cfg80211_is_element_inherited - returns if element ID should be inherited
* @element: element to check

41
net/wireless/scan.c
View File

@ -1791,25 +1791,13 @@ cfg80211_bss_update(struct cfg80211_registered_device *rdev,
return NULL;
}
/*
* Update RX channel information based on the available frame payload
* information. This is mainly for the 2.4 GHz band where frames can be received
* from neighboring channels and the Beacon frames use the DSSS Parameter Set
* element to indicate the current (transmitting) channel, but this might also
* be needed on other bands if RX frequency does not match with the actual
* operating channel of a BSS.
*/
static struct ieee80211_channel *
cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
struct ieee80211_channel *channel,
enum nl80211_bss_scan_width scan_width)
int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
enum nl80211_band band)
{
const u8 *tmp;
u32 freq;
int channel_number = -1;
struct ieee80211_channel *alt_channel;
if (channel->band == NL80211_BAND_S1GHZ) {
if (band == NL80211_BAND_S1GHZ) {
tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen);
if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) {
struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2);
@ -1830,6 +1818,29 @@ cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
}
}
return channel_number;
}
EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
/*
* Update RX channel information based on the available frame payload
* information. This is mainly for the 2.4 GHz band where frames can be received
* from neighboring channels and the Beacon frames use the DSSS Parameter Set
* element to indicate the current (transmitting) channel, but this might also
* be needed on other bands if RX frequency does not match with the actual
* operating channel of a BSS.
*/
static struct ieee80211_channel *
cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
struct ieee80211_channel *channel,
enum nl80211_bss_scan_width scan_width)
{
u32 freq;
int channel_number;
struct ieee80211_channel *alt_channel;
channel_number = cfg80211_get_ies_channel_number(ie, ielen, channel->band);
if (channel_number < 0) {
/* No channel information in frame payload */
return channel;