Public bug reported:
There are situations where I have multiple APs (living on separate
networks) in range simultaneously and I need to be able to manually
choose between them (to manually move between those separate networks).
To handle this, I have multiple wpa_supplicant config files for each of the
APs, and I use logical interfaces in /etc/network/interfaces to select the
appropriate config file. For example:
iface public inet manual
wpa-conf /etc/wpa_supplicant/public.conf
iface private inet manual
wpa-conf /etc/wpa_supplicant/private.conf
To select the appropriate AP, I simply run `ifup wlan0=public` or `ifup
wlan0=private`. This part works fine.
However, I would like to change the "wpa-conf" lines in the above
example to use "wpa-roam" instead, so I can also handle roaming in
conjunction with multiple wpa_supplicant config files. Unfortunately
this doesn't work. When the "master" interface is already using a
logical interface in /etc/network/interfaces, wpa-roam fails to load the
logical interface specified by id_str.
The problem is that the ifup() function in functions.sh runs `grep -q
"^$WPA_IFACE=$WPA_IFACE" "$IFSTATE_FILE"` to determine if the interface
is already up, then runs /sbin/ifup either with or without '--force'
depending on whether the interface is "up". If the "master" interface
is defined in /etc/network/interfaces as a logical interface rather than
a physical interface, then grep will not match, '--force' will not be
used, and /sbin/ifup will fail because the interface is already
configured and '--force' was not used.
The attached patch fixes this issue by running `ifquery` to determine
whether the physical interface is currently up and configured as a
wpasupplicant "master" interface, and will run /sbin/ifup with '--force'
even if the "master" interface is a logical interface in
/etc/network/interfaces. If the physical interface is already up but is
not configured as a "master" interface, then it is likely we received
two "CONNECT" events without a "DISCONNECT" between them, so `ifdown` is
run on the old logical interface before `ifup` is run on the new one.
** Affects: wpa (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "patch"
https://bugs.launchpad.net/bugs/1545363/+attachment/4571280/+files/patch
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https://bugs.launchpad.net/bugs/1545363
Title:
wpa-roam does not support logical "master" interfaces
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