channel to another one (simple voice call switching)
* add a way more generic E1 input layer, abstracting out the misdn
low-level interface. This also adds infrastructure for multiple TRX
in one BTS, as well as multiple BTS on one E1 link
* add a E1 subchannel multiplexer for sending multiple 16kbit sub-channels
one one 64kBps E1 channel
* add TRAU IDLE frame generation
* terminate bsc_hack in case there is a E1 / mISDN init error
* introduce 'e1_config.c' file with static configuration of our
E1 setup (which TRX/BTS is configured for which TEI/SAPI/E1). This should
later become a config file rather than a compiled C file.
WARNING: all this compiles but is not tested yet. Expect fix-up committs over
the next hours or so
There is a 1:1 relationship between gsm_bts and the paging
operation. Move the paging state into the gsm_bts which is
simplfying the code a lot. This was hinted by LaF0rge.
(I'm not happy with the names of the structs)
- Initialize Control Channel Description of SI3
- Patch the table
- Setting ATT now is easy
- Paging can now extract all required information... to determine
the right paging group.
Wrote and test code to add and remove paging requests... This
will be using the fact that the linux list is building a circle
on each tick we can send one/x paging requests and continue round
robin...
Add the -f option to use a different channel. This is done
by patching the various tables before the OML and RSL is brought
up. It looks like it is working...
Patch by Harald, moving of the patch_tables invocation by zecke
Remove the callbacks from gsm_network for now. A set of different
callbacks will be back. E.g. when the paging is completed, when the
Q.931 like call handling is there...
Remove var's or move them into #if 0, remove unused stuff that looks
like we do not need it anytime soon or #if 0 them, move stuff around.
This might turn into a complete wire protocol with special
client software. For now it will be a simple client interface
that you can use with telnet to do certain things.
This is using flex to implement the parsing. Implementation
and more commands will follow.
When using ISDN as network type and using a fake LAPD encapsulation
wireshark should be able to recognize some bits if dump.
Append a dummy LAPD header. It is not clear to me if the Control field
of the LAPD frame is part of the msg or if we need to add it as well.
TODO:
- Do the same for the B Channel
- Write out time
- Check if more of the LAPD frame needs to be prepended. The
information from the mISDNhead comes into mind. Maybe it makes
sense to start a custom wireshark mISDN dissector.
gsm_data.h add new callbacks, add some parameters, update bsc_hack and
other call sites.
Remember that we need to ACCEPT/REJECT the LOCATION UPDATE REQUEST and
then send the ACCEPT or schedule the sending of the reject. Currently
it is possible that for a new subscriber that we do not have a !subscbr
yet, we will trigger an IDENTITY REQUEST and schedule the reject timer.
This may lead to rejecting AND accepting (a new subscriber). This issue
is triggered when allowing everyone to connect to the network.
On channel allocation the bsc_hack added a cookie to the lchan on
ack and nack we will take a look and then assume it is the channel
we have allocated. This can be easily exploited by a MS sending fake
responses to paging commands. After the channel has been acked we would
have to ask for the tmsi or find the information on the channel
allocation. For now we will guess.
Currently it is not possible to know for which tmsi the channel
is going to be allocated. The bsc_hack will guess.. in the future
it might be forced to ask for the tmsi after the channel has been
opened...
Add a callback to the gsm_network. When updating the location and
assigning a new tmsi callback into the bsc_hack.c and have a queue
of mobile stations to page, allocate a channel for and ultimately
dial.
* initialize OML and RSL based on TEI establish (ACTIVATE_IND) events
* fix abis_nm_raw_msg() to not overwrite the OML header with payload
* fix debug print statements
* fix msgb_dequeue: actually dequeue it from the list ;)
Harald Welte
Holger Freyther