Open networks do not contain a RSN element, so storing a 256 byte buffer
was too expensive.
This patch also has the side-effect of fixing detection of Open
Networks. Prior to this, if the scan results did not contain an RSN IE,
the 'rsne' variable would be set to all zeros. scan_get_ssid_security
would then be called, but instead of a NULL struct ie_rsn_info, a
non-null, but zerod out ie_rsn_info would be passed in. This caused the
code to work, but for the wrong reasons.
Instead of mallocing the ssid buffer, use a static array. This removes an
extra couple of malloc/free operations and should result in less memory
utilization on average.
Authenticate event on wiphy mlme notification does not provide
enough information on which network/bss authentication command
was sent. BSS and network information is required to send associate
command to AP. So cache bss pointer in netdev struct and retrieve
on wiphy mlme notifications.
Instead of storing multiple copies of the same BSS (one hanging off the
netdev object and one hanging off the network object), we instead store
the BSS list only on the netdev object.
The network object gets a pointer to the BSS structure on the netdev
list. As a side effect, the BSS list is always sorted properly.
Instead of always mallocing space for the ssid array, and then freeing
it in most circumstances, do the opposite. Only allocate the array once
it is actually needed. This has the side effect of removing an unneeded
variable and making the code simpler.
The idea here is that network object will contain a list of BSS
that have the same SSID and security setting. From user point of view,
we will connect to a certain SSID instead of connecting directly to
a BSS. We pick the best BSS automatically from the BSS list when
connecting to a SSID.
MLME notify function prints error if wiphy or netdev is missing.
The error text in this case talks about scan notification instead
of more proper MLME notification.
Make sure to print some errors if attributes cannot be appended
to a message. It is dangerous to ignore the return code from
l_genl_msg_append_attr() because the kernel might act weirdly
if some attribute is missing.
Add rudimentary support for mac80211 scheduled scan feature.
This is done so that kernel support for task called "Bind
NL80211_CMD_START_SCHED_SCAN to netlink socket" from TODO
file can be tested. The current scan interval is set to 60
seconds which is probably too fast for the final version.
Because none of the attributes are assigned until after the DeviceAdded
signal is emitted, the signal appears with invalid properties. For now,
move the netdev structure fill-out into the if statement.
If the netdev attributes can change, then these need to be handled
separately and appropriate signals to be sent.
