gbproxy: Patch BSSGP P-TMSI in PAGING PS messages
Currently the P-TMSI IE in PAGING_PS is not patched.
This commit adds code to patch BSSGP P-TMSI IE in
gbproxy_patch_bssgp independently from the P-TMSI patching at the LLC
layer. It also extends gbproxy_update_link_state_dl to use the IMSI
to find the link_info if the TLLI is not present in the message.
Note that the spec (GSM 08.18, 7.2) requires to use of the P-TMSI
instead of the IMSI to select the MS if that IE is available.
Nevertheless as long as the IMSI is always present in downlink BSSGP
messages and as long as the optional P-TMSI refers to the same MS
(which is the case currently), this is not an issue.
Sponsored-by: On-Waves ehf
diff --git a/openbsc/tests/gbproxy/gbproxy_test.ok b/openbsc/tests/gbproxy/gbproxy_test.ok
index 9dbcb45..c5bf0c8 100644
--- a/openbsc/tests/gbproxy/gbproxy_test.ok
+++ b/openbsc/tests/gbproxy/gbproxy_test.ok
@@ -2756,6 +2756,30 @@
TLLI cache size : 1
TLLI-Cache: 1
TLLI ead4775a -> e0543210, IMSI 12131415161718, AGE 0
+PROCESSING PAGING_PS from 0x05060708:32000
+00 00 00 00 06 0d 88 11 12 13 14 15 16 17 18 0a 82 07 04 1b 86 11 22 33 40 50 60 18 83 00 00 00 20 84 e0 54 32 10
+
+CALLBACK, event 0, msg length 34, bvci 0x0000
+00 00 00 00 06 0d 88 11 12 13 14 15 16 17 18 0a 82 07 04 1b 86 11 22 33 40 50 60 18 83 00 00 00 20 84 e0 54 32 10
+
+NS UNITDATA MESSAGE to BSS, BVCI 0x0000, msg length 34 (gprs_ns_sendmsg)
+MESSAGE to BSS at 0x01020304:1111, msg length 38
+00 00 00 00 06 0d 88 11 12 13 14 15 16 17 18 0a 82 07 04 1b 86 11 22 33 40 50 60 18 83 00 00 00 20 84 ea d4 77 5a
+
+result (PAGING_PS) = 38
+
+Peers:
+ NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
+ RAID patched (BSS ): 13
+ RAID patched (SGSN): 5
+ APN patched : 1
+ TLLI patched (BSS ): 11
+ TLLI patched (SGSN): 9
+ P-TMSI patched (SGSN): 4
+ Attach Request count : 1
+ TLLI cache size : 1
+ TLLI-Cache: 1
+ TLLI ead4775a -> e0543210, IMSI 12131415161718, AGE 0
PROCESSING LLC_DISCARDED from 0x01020304:1111
00 00 00 00 2c 1f 84 ea d4 77 5a 0f 81 01 04 82 ee e1 25 83 00 00 0c
@@ -2838,12 +2862,12 @@
Peers:
NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
RAID patched (BSS ): 14
- RAID patched (SGSN): 5
+ RAID patched (SGSN): 6
APN patched : 1
TLLI patched (BSS ): 13
TLLI patched (SGSN): 10
P-TMSI patched (BSS ): 1
- P-TMSI patched (SGSN): 3
+ P-TMSI patched (SGSN): 4
Attach Request count : 1
TLLI from SGSN unknown : 2
TLLI cache size : 1
@@ -2864,12 +2888,12 @@
Peers:
NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
RAID patched (BSS ): 14
- RAID patched (SGSN): 5
+ RAID patched (SGSN): 6
APN patched : 1
TLLI patched (BSS ): 13
TLLI patched (SGSN): 11
P-TMSI patched (BSS ): 1
- P-TMSI patched (SGSN): 3
+ P-TMSI patched (SGSN): 4
Attach Request count : 1
TLLI from SGSN unknown : 2
TLLI-Cache: 0