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Osmocom Packet control Unit (PCU): Network-side GPRS (RLC/MAC); BTS- or BSC-colocated https://osmocom.org/projects/osmopcu
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Neels Hofmeyr b78a4a6dfe fix segfault: check for NULL tbf in sched_select_ctrl_msg() 
Apparently fixes a corrupted stack looking like this on sysmobts:

  (gdb) run
  Starting program: /usr/bin/osmo-pcu -c /etc/osmocom/osmo-pcu.cfg
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib/libthread_db.so.1".
  <000b> telnet_interface.c:95 telnet at 127.0.0.1 4240
  <0001> osmobts_sock.cpp:227 Opening OsmoPCU L1 interface to OsmoBTS
  <0001> osmobts_sock.cpp:285 osmo-bts PCU socket has been connected
  <0001> pcu_l1_if.cpp:368 BTS available
  <0008> gprs_ns.c:233 NSVCI=65534 Creating NS-VC
  <0008> gprs_ns.c:233 NSVCI=100 Creating NS-VC
  <0008> gprs_ns.c:1568 NSEI=100 RESET procedure based on API request
  <0008> gprs_ns.c:393 NSEI=100 Tx NS RESET (NSVCI=100, cause=O&M intervention)
  <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=2
  <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=2
  <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=3
  <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=3
  <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=4
  <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=4
  <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=5
  <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=5
  <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=6
  <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=6
  <0001> pcu_l1_if.cpp:83 Sending activate request: trx=0 ts=7
  <0001> pcu_l1_if.cpp:495 PDCH: trx=0 ts=7
  <0001> pcu_l1_if.cpp:319 RACH request received: sapi=1 qta=0, ra=120, fn=103198
  <0009> tbf_ul.cpp:373 LLC [PCU -> SGSN] TBF(TFI=0 TLLI=0x7f2dd569 DIR=UL STATE=FLOW) len=6
  <0008> gprs_ns.c:684 All NS-VCs for NSEI 100 are either dead or blocked!

  Program received signal SIGSEGV, Segmentation fault.
  gprs_rlcmac_rcv_rts_block (bts=0x60a08, trx=trx@entry=0 '\000', ts=ts@entry=4 '\004', fn=7, fn@entry=103272,
      block_nr=block_nr@entry=0 '\000') at gprs_rlcmac_sched.cpp:349
  349	gprs_rlcmac_sched.cpp: No such file or directory.
  (gdb) bt
  #0  gprs_rlcmac_rcv_rts_block (bts=0x60a08, trx=trx@entry=0 '\000', ts=ts@entry=4 '\004', fn=7, fn@entry=103272,
      block_nr=block_nr@entry=0 '\000') at gprs_rlcmac_sched.cpp:349
  #1  0x0001151c in pcu_rx_rts_req_pdtch (trx=<optimized out>, ts=<optimized out>, fn=103272, block_nr=<optimized out>)
      at pcu_l1_if.cpp:279
  #2  0x0000bfcc in handle_ph_readytosend_ind (fl1h=0xafa40, rts_ind=0xb03f8) at osmo-bts-sysmo/sysmo_l1_if.c:142
  #3  l1if_handle_l1prim (wq=<optimized out>, fl1h=0xafa40, msg=0xb0330) at osmo-bts-sysmo/sysmo_l1_if.c:259
  #4  0x4fcd6330 in osmo_fd_disp_fds (_eset=0xbefffb68, _wset=0xbefffae8, _rset=0xbefffa68) at select.c:149
  #5  osmo_select_main (polling=<optimized out>) at select.c:189
  #6  0x0000b2a0 in main (argc=<optimized out>, argv=0x66628 <_ZStL8__ioinit>) at pcu_main.cpp:295

Fixes: coverity CID#158969
Related: https://lists.osmocom.org/pipermail/osmocom-net-gprs/2016-December/000785.html
Change-Id: I357492e558e98cfdbf5bb3438b5013029195b02b
 		2017-01-06 13:54:04 +00:00
contrib jenkins.sh: use osmo-build-dep.sh, output testlogs 2016-10-20 11:42:03 +00:00
debian debian: fix: add pcuif_proto.h to osmo-pcu.install 2016-11-30 00:37:32 +01:00
examples Revert "pcu: Improve default config" 2015-11-30 12:11:48 +01:00
include Install the pcuif_proto.h header file 2016-11-17 21:09:55 +01:00
src fix segfault: check for NULL tbf in sched_select_ctrl_msg() 2017-01-06 13:54:04 +00:00
tests Refactoring write_packet_ack_nack_desc_egprs to prepare for CRBB support 2017-01-06 10:36:07 +00:00
.gitignore Cleanup build leftovers 2016-04-22 14:41:16 +02:00
.gitreview add .gitreview 2016-05-19 06:39:45 +00:00
COPYING import GPLv2 license text to this project 2012-07-22 22:05:44 +02:00
Makefile.am Install the pcuif_proto.h header file 2016-11-17 21:09:55 +01:00
README Cleanup readme 2016-07-23 19:24:41 +00:00
TODO TODO: Update the todolist with some musings... 2014-01-16 10:11:57 +01:00
configure.ac Install the pcuif_proto.h header file 2016-11-17 21:09:55 +01:00
git-version-gen Add auto-foo (partial cleanup, master makefile/configure.ac 2012-06-14 21:05:44 +08:00
osmoappdesc.py Added conditional python-based tests for VTY/config handling 2013-04-06 11:00:20 +02:00

README 

This is an implementation of Packet Control Unit (PCU) according to TS 04.60

The PCU is part of BSS, so it connects directly to SGSN.


== Current limitations ==

 * No PFC support
 * No fixed allocation support
 * No extended dynamic allocation support
 * No unacknowledged mode operation
 * Only single slot assignment on uplink direction
 * No half-duplex class support (only semi-duplex)
 * No handover support
 * No measurement support
 * No TA loop
 * No power loop
 * No CS loop
 * No EGPRS