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Update frequency parsing for iw 6.7 compatibility

Browse Source 
Since iw 6.7, which adds 802.11ah support, iw may print fractional
frequencies (e.g. 917.4 MHz). The change in the formatting code can
also affect frequencies in the 2.4 and 5 GHz bands, so a frequency
that used to be shown as "2412 MHz" may now be shown as "2412.0 MHz".

This breaks the parsing logic in `can_transmit_to_channel`,
`ieee80211_frequency_to_channel` and `is_5ghz_frequency`.
The problem in `can_transmit_to_channel` causes an error when creating
an AP, due the frequency not being detected as supported ("ERROR:
Your adapter can not transmit to channel 1, frequency band 2.4GHz.").

Fix this by changing the parsing logic to accept a trailing ".0"
(or even ".00", etc.) suffix for the existing 2.4 and 5 GHz bands.

See also: https://git.kernel.org/pub/scm/linux/kernel/git/jberg/iw.git/commit/?id=f2d9f5b52677f5414dc194be94b5916d2b080eab
          https://git.kernel.org/pub/scm/linux/kernel/git/jberg/iw.git/commit/?id=e2224c729840cc33c6ea89ba5e91b69f79c88e85
          https://git.kernel.org/pub/scm/linux/kernel/git/jberg/iw.git/commit/?id=1bc6ab0abbb6f26f35d826d166d06bc28ae47b6b
This commit is contained in:
Joan Bruguera Micó 2023-12-23 20:00:34 +00:00
parent 805d157851
commit 50cf12cbb5
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/scripts/create_ap
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@ -321,9 +321,9 @@ can_transmit_to_channel() {
if [[ $USE_IWCONFIG -eq 0 ]]; then
if [[ $FREQ_BAND == 2.4 ]]; then
CHANNEL_INFO=$(get_adapter_info ${IFACE} | grep " 24[0-9][0-9] MHz \[${CHANNEL_NUM}\]")
CHANNEL_INFO=$(get_adapter_info ${IFACE} | grep " 24[0-9][0-9]\(\.0\+\)\? MHz \[${CHANNEL_NUM}\]")
else
CHANNEL_INFO=$(get_adapter_info ${IFACE} | grep " \(49[0-9][0-9]\|5[0-9]\{3\}\) MHz \[${CHANNEL_NUM}\]")
CHANNEL_INFO=$(get_adapter_info ${IFACE} | grep " \(49[0-9][0-9]\|5[0-9]\{3\}\)\(\.0\+\)\? MHz \[${CHANNEL_NUM}\]")
fi
[[ -z "${CHANNEL_INFO}" ]] && return 1
[[ "${CHANNEL_INFO}" == *no\ IR* ]] && return 1
@ -339,7 +339,9 @@ can_transmit_to_channel() {
# taken from iw/util.c
ieee80211_frequency_to_channel() {
local FREQ=$1
local FREQ_MAYBE_FRACTIONAL=$1
local FREQ=${FREQ_MAYBE_FRACTIONAL%.*}
if [[ $FREQ -eq 2484 ]]; then
echo 14
elif [[ $FREQ -lt 2484 ]]; then
@ -356,7 +358,7 @@ ieee80211_frequency_to_channel() {
}
is_5ghz_frequency() {
[[ $1 =~ ^(49[0-9]{2})|(5[0-9]{3})$ ]]
[[ $1 =~ ^(49[0-9]{2})|(5[0-9]{3})(\.0+)?$ ]]
}
is_wifi_connected() {