gprs: Implement BSSGP MCC/MNC patching

This adds a feature to patch the BSSGP MNC/MCC fields of messages going
to and coming from the SGSN. To enable this feature, the gbproxy's
VTY commands 'core-mobile-country-code' and/or
'core-mobile-network-code' must be used. All packets to the SGSN are
patched to match the configured values. Packets received from the
SGSN are patched to the corresponding values as last seen from the BSS
side.

Note that this will probably not work with a gbproxy used for several
BSS simultaneously.

Note also, that MCC/MNC contained in a LLC IE will not be patched.

Ticket: OW#1185
Sponsored-by: On-Waves ehf

1 files changed, 18 insertions, 14 deletions

diff --git a/openbsc/tests/gbproxy/gbproxy_test.ok b/openbsc/tests/gbproxy/gbproxy_test.ok
index 5f186c2e7..de19df991 100644
--- a/openbsc/tests/gbproxy/gbproxy_test.ok
+++ b/openbsc/tests/gbproxy/gbproxy_test.ok
@@ -1509,7 +1509,7 @@ CALLBACK, event 0, msg length 22, bvci 0x0000
 
 NS UNITDATA MESSAGE to SGSN, BVCI 0x0000, msg length 22 (gprs_ns_sendmsg)
 MESSAGE to SGSN at 0x05060708:32000, msg length 26
-00 00 00 00 22 04 82 10 02 07 81 08 08 88 11 22 33 40 50 60 10 00 00 00 00 00 
+00 00 00 00 22 04 82 10 02 07 81 08 08 88 21 63 54 40 50 60 10 00 00 00 00 00 
 
 result (BVC_RESET) = 26
 
@@ -1540,7 +1540,7 @@ CALLBACK, event 0, msg length 15, bvci 0x0000
 
 NS UNITDATA MESSAGE to SGSN, BVCI 0x0000, msg length 15 (gprs_ns_sendmsg)
 MESSAGE to SGSN at 0x05060708:32000, msg length 19
-00 00 00 00 0b 1f 84 cc d1 75 8b 1b 86 11 22 33 40 50 60 
+00 00 00 00 0b 1f 84 cc d1 75 8b 1b 86 21 63 54 40 50 60 
 
 result (BVC_SUSPEND) = 19
 
@@ -1550,14 +1550,15 @@ PROCESSING BVC_SUSPEND_ACK from 0x05060708:32000
 CALLBACK, event 0, msg length 18, bvci 0x0000
 00 00 00 00 0c 1f 84 cc d1 75 8b 1b 86 21 63 54 40 50 60 1d 81 01 
 
-NS UNITDATA MESSAGE to SGSN, BVCI 0x0000, msg length 24 (gprs_ns_sendmsg)
-MESSAGE to SGSN at 0x05060708:32000, msg length 28
-00 00 00 00 41 07 81 05 15 92 0c 1f 84 cc d1 75 8b 1b 86 21 63 54 40 50 60 1d 81 01 
+NS UNITDATA MESSAGE to BSS, BVCI 0x0000, msg length 18 (gprs_ns_sendmsg)
+MESSAGE to BSS at 0x01020304:1111, msg length 22
+00 00 00 00 0c 1f 84 cc d1 75 8b 1b 86 11 22 33 40 50 60 1d 81 01 
 
-result (BVC_SUSPEND_ACK) = 28
+result (BVC_SUSPEND_ACK) = 22
 
 Gbproxy global:
-    Invalid Routing Area Identifier : 1
+    RAID patched              (BSS ): 2
+    RAID patched              (SGSN): 1
 Peers:
   NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
 --- Send message from BSS 1 to SGSN, BVCI 0x1002 ---
@@ -1570,7 +1571,7 @@ CALLBACK, event 0, msg length 75, bvci 0x1002
 
 NS UNITDATA MESSAGE to SGSN, BVCI 0x1002, msg length 75 (gprs_ns_sendmsg)
 MESSAGE to SGSN at 0x05060708:32000, msg length 79
-00 00 10 02 01 bb c5 46 79 00 00 04 08 88 11 22 33 40 50 60 75 30 00 80 0e 00 34 01 c0 01 08 01 02 f5 e0 21 08 02 05 f4 fb c5 46 79 11 22 33 40 50 60 19 18 b3 43 2b 25 96 62 00 60 80 9a c2 c6 62 00 60 80 ba c8 c6 62 00 60 80 00 16 6d 01 
+00 00 10 02 01 bb c5 46 79 00 00 04 08 88 21 63 54 40 50 60 75 30 00 80 0e 00 34 01 c0 01 08 01 02 f5 e0 21 08 02 05 f4 fb c5 46 79 11 22 33 40 50 60 19 18 b3 43 2b 25 96 62 00 60 80 9a c2 c6 62 00 60 80 ba c8 c6 62 00 60 80 00 16 6d 01 
 
 result (ATTACH REQUEST) = 79
 
@@ -1594,7 +1595,7 @@ CALLBACK, event 0, msg length 85, bvci 0x1002
 
 NS UNITDATA MESSAGE to SGSN, BVCI 0x1002, msg length 85 (gprs_ns_sendmsg)
 MESSAGE to SGSN at 0x05060708:32000, msg length 89
-00 00 10 02 01 af e2 80 6e 00 00 04 08 88 11 22 33 40 50 60 70 80 00 80 0e 00 3e 01 c0 15 08 08 10 11 22 33 40 50 60 1d 19 13 42 33 57 2b f7 c8 48 02 13 48 50 c8 48 02 14 48 50 c8 48 02 17 49 10 c8 48 02 00 19 8b b2 92 17 16 27 07 04 31 02 e5 e0 32 02 20 00 96 3e 97 
+00 00 10 02 01 af e2 80 6e 00 00 04 08 88 21 63 54 40 50 60 70 80 00 80 0e 00 3e 01 c0 15 08 08 10 11 22 33 40 50 60 1d 19 13 42 33 57 2b f7 c8 48 02 13 48 50 c8 48 02 14 48 50 c8 48 02 17 49 10 c8 48 02 00 19 8b b2 92 17 16 27 07 04 31 02 e5 e0 32 02 20 00 96 3e 97 
 
 result (UPDATE REQ) = 89
 
@@ -1618,7 +1619,7 @@ CALLBACK, event 0, msg length 76, bvci 0x1002
 
 NS UNITDATA MESSAGE to SGSN, BVCI 0x1002, msg length 76 (gprs_ns_sendmsg)
 MESSAGE to SGSN at 0x05060708:32000, msg length 80
-00 00 10 02 01 ef e2 b7 00 00 00 04 08 88 11 22 33 40 50 60 75 30 00 80 0e 00 35 01 c0 0d 0a 41 05 03 0c 00 00 1f 10 00 00 00 00 00 00 00 00 02 01 21 28 03 02 61 62 27 14 80 80 21 10 01 00 00 10 81 06 00 00 00 00 83 06 00 00 00 00 5a ff 02 
+00 00 10 02 01 ef e2 b7 00 00 00 04 08 88 21 63 54 40 50 60 75 30 00 80 0e 00 35 01 c0 0d 0a 41 05 03 0c 00 00 1f 10 00 00 00 00 00 00 00 00 02 01 21 28 03 02 61 62 27 14 80 80 21 10 01 00 00 10 81 06 00 00 00 00 83 06 00 00 00 00 5a ff 02 
 
 result (ACT PDP CTX REQ (REPLACE APN)) = 80
 
@@ -1630,12 +1631,13 @@ CALLBACK, event 0, msg length 76, bvci 0x1002
 
 NS UNITDATA MESSAGE to SGSN, BVCI 0x1002, msg length 76 (gprs_ns_sendmsg)
 MESSAGE to SGSN at 0x05060708:32000, msg length 80
-00 00 10 02 01 ef e2 b7 00 00 00 04 08 88 11 22 33 40 50 60 75 30 00 80 0e 00 35 01 c0 0d 0a 41 05 03 0c 00 00 1f 10 00 00 00 00 00 00 00 00 02 01 21 28 03 02 61 62 27 14 80 80 21 10 01 00 00 10 81 06 00 00 00 00 83 06 00 00 00 00 5a ff 02 
+00 00 10 02 01 ef e2 b7 00 00 00 04 08 88 21 63 54 40 50 60 75 30 00 80 0e 00 35 01 c0 0d 0a 41 05 03 0c 00 00 1f 10 00 00 00 00 00 00 00 00 02 01 21 28 03 02 61 62 27 14 80 80 21 10 01 00 00 10 81 06 00 00 00 00 83 06 00 00 00 00 5a ff 02 
 
 result (ACT PDP CTX REQ (REMOVE APN)) = 80
 
 Gbproxy global:
-    Invalid Routing Area Identifier : 1
+    RAID patched              (BSS ): 6
+    RAID patched              (SGSN): 1
 Peers:
   NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
 --- Bad cases ---
@@ -1656,13 +1658,15 @@ CALLBACK, event 0, msg length 18, bvci 0x0000
 
 NS UNITDATA MESSAGE to SGSN, BVCI 0x0000, msg length 24 (gprs_ns_sendmsg)
 MESSAGE to SGSN at 0x05060708:32000, msg length 28
-00 00 00 00 41 07 81 05 15 92 0c 1f 84 cc d1 75 8b 1b 86 00 f1 99 00 63 60 1d 81 01 
+00 00 00 00 41 07 81 05 15 92 0c 1f 84 cc d1 75 8b 1b 86 11 22 33 00 63 60 1d 81 01 
 
 result (BVC_SUSPEND_ACK) = 28
 
 Gbproxy global:
     Invalid BVC Identifier          : 1
-    Invalid Routing Area Identifier : 2
+    Invalid Routing Area Identifier : 1
+    RAID patched              (BSS ): 6
+    RAID patched              (SGSN): 2
 Peers:
   NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
 ===== GbProxy test END