umbim: fix invalid mbim message string encoding

Strings in mbim messages have to follow these formatting rules:
 - 4 byte alignment, padded if not.
 - utf-16 little endian.

Fixes:
 - mbim connect fails with more than 1 string parameter (apn/user/pass)
   when they are not 4 byte aligned.

Signed-off-by: Daniel Danzberger <daniel@dd-wrt.com>

umbim: fix compilation with GCC 10

When building umbim with GCC 10, a bunch of these errors appear:

cli.c: In function 'mbim_device_caps_response':
cli.c:55:29: error: taking address of packed member of 'struct mbim_basic_connect_device_caps_r' may result in an unaligned pointer value [-Werror=address-of-packed-member]
   55 |  deviceid = mbim_get_string(&caps->deviceid, buffer);
      |                             ^~~~~~~~~~~~~~~

Fix them by disabling padding between fields of struct mbim_string.

Acked-by: John Crispin <john@phrozen.org>
Signed-off-by: Stijn Tintel <stijn@linux-ipv6.be>

umbim: add home provider query support

This adds support to query the home provider, mainly for debugging and
information purposes.

Signed-off-by: Ingo Feinerer <feinerer@logic.at>
Reviewed-by: Bjørn Mork <bjorn@mork.no>

Iron out all extra compiler warnings

mbim-msg.c:83:17: error: comparison between signed and unsigned integer expressions
cli.c:50:10: error: comparison between signed and unsigned integer expressions
cli.c:81:10: error: comparison between signed and unsigned integer expressions
cli.c:104:10: error: comparison between signed and unsigned integer expressions
cli.c:140:10: error: comparison between signed and unsigned integer expressions
cli.c:154:18: error: comparison between signed and unsigned integer expressions
cli.c:171:10: error: comparison between signed and unsigned integer expressions
cli.c:194:10: error: comparison between signed and unsigned integer expressions
cli.c:223:10: error: comparison between signed and unsigned integer expressions
cli.c:229:17: error: comparison between signed and unsigned integer expressions
cli.c:241:17: error: comparison between signed and unsigned integer expressions
cli.c:247:17: error: comparison between signed and unsigned integer expressions
cli.c:259:17: error: comparison between signed and unsigned integer expressions
cli.c:272:10: error: comparison between signed and unsigned integer expressions
cli.c:549:16: error: comparison between signed and unsigned integer expressions
mbim-dev.c:68:21: error: comparison between signed and unsigned integer expressions
mbim-dev.c:97:10: error: comparison between signed and unsigned integer expressions

Reviewed-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Petr Štetiar <ynezz@true.cz>

Enable extra compiler checks

Let's enforce additional automatic checks enforced by the compiler in
order to catch possible errors during compilation.

Reviewed-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: Petr Štetiar <ynezz@true.cz>

mbim-proxy support

This adds support for the libmbim-glib "mbim-proxy", allowing umbim to access
a device under ModemManager control. The feature is mostly useful for debugging
and development purposes, and is therefore disabled by default.

Signed-off-by: Bjørn Mork <bjorn@mork.no>

umbim: add registration set support

This implements the MBIM automatic registration mode to let the function
select the best provider network.

Signed-off-by: Ingo Feinerer <feinerer@logic.at>
Reviewed-by: Bjørn Mork <bjorn@mork.no>

add radio_state set/query support

Signed-off-by: Bjørn Mork <bjorn@mork.no>

update usage()

Signed-off-by: Bjørn Mork <bjorn@mork.no>

get buffer size from driver

Signed-off-by: Bjørn Mork <bjorn@mork.no>

dynamically allocate buffer

Signed-off-by: Bjørn Mork <bjorn@mork.no>

support non default ip-types

Signed-off-by: Bjørn Mork <bjorn@mork.no>

support IPv6 configuration

Signed-off-by: Bjørn Mork <bjorn@mork.no>

fix IP configuration prefix output

Signed-off-by: Bjørn Mork <bjorn@mork.no>

add command_id to verbose output

Signed-off-by: Bjørn Mork <bjorn@mork.no>

avoid parsing InformationBuffer unless status is "success"

The MBIM specification requires that the InformationBuffer
is empty unless the status field is MBIM_STATUS_SUCCESS,
except for 4 explicit combinations of status code and
command id.

Avoid calling the reply handler if the status code is
non-zero and the information buffer is empty.

Signed-off-by: Bjørn Mork <bjorn@mork.no>

add command done status to verbose output

Signed-off-by: Bjørn Mork <bjorn@mork.no>

fix subscriber response segfault

Signed-off-by: Bjørn Mork <bjorn@mork.no>

fix build for 64 bit systems

Signed-off-by: John Crispin <blogic@openwrt.org>

cleanup authprotocol handling

Signed-off-by: John Crispin <blogic@openwrt.org>

add support for authproto/username/password

Signed-off-by: John Crispin <blogic@openwrt.org>

sanitize pincode properly

Signed-off-by: John Crispin <blogic@openwrt.org>

add gpl license

Signed-off-by: John Crispin <blogic@openwrt.org>

initial import