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module/network: resurrect SSID

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Recent kernels, or possibly updated wireless drivers, no longer
provide the SSID in `NL80211_CMD_NEW_STATION` responses.

For yambar, this meant the SSID was always missing.

This patch fixes this, by also issuing a NL80211_CMD_GET_SCAN
command. The response to this (NL80211_CMD_SCAN_RESULTS) _may_ return
many access points. Pick out the one that we’re associated with, and
inspect its BSS_INFORMATION_ELEMENTS. This is a raw data structure
containing, among other things, the SSID.

I haven’t been able to find any documentation of the format, but could
glean enough from
https://git.kernel.org/pub/scm/linux/kernel/git/jberg/iw.git/tree/scan.c#n2313
to be able to parse out the SSID.

Note that we get a “device or resource busy” error if we try to issue
both the NL80211_CMD_GET_STATION and the NL80211_CMD_GET_SCAN commands
at the same time. Therefore, we issue the GET_SCAN command after
completing the GET_STATION command.

Closes #226
This commit is contained in:
Daniel Eklöf 2022-09-10 13:46:34 +02:00
parent d1a8029e6c
commit 4143099e94
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2 changed files with 147 additions and 3 deletions
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@ -110,6 +110,9 @@
* string: crash when failing to convert string to UTF-32.
* script: only first transaction processed when receiving multiple
transactions in a single batch ([#221][221]).
* network: missing SSID (recent kernels, or possibly wireless drivers,
no longer provide the SSID in the `NL80211_CMD_NEW_STATION`
response) ([#226][226]).
[169]: https://codeberg.org/dnkl/yambar/issues/169
[172]: https://codeberg.org/dnkl/yambar/issues/172
@ -117,6 +120,7 @@
[177]: https://codeberg.org/dnkl/yambar/issues/177
[198]: https://codeberg.org/dnkl/yambar/issues/198
[221]: https://codeberg.org/dnkl/yambar/issues/221
[226]: https://codeberg.org/dnkl/yambar/issues/226
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