cellular-infrastructure
/
osmo-msc
mirror of https://gerrit.osmocom.org/osmo-msc
9
0
Fork 0
Code Issues Releases Wiki Activity

gbproxy: Handle old and new P-TMSI/TLLI 

Don't replace the current TLLI immediately, store it in an additional
'assigned_tlli' field and discard the old TLLI when both sides have
used the new one (see GSM 04.08, 4.7.1.5).

Add an Attach Complete message to test and check, whether the related
field of the corresponding tlli_info struct are set as expected
during the local TLLI validation cycle.

Sponsored-by: On-Waves ehf
This commit is contained in:
Jacob Erlbeck 2014-08-11 17:26:21 +02:00 committed by Holger Hans Peter Freyther
parent 3c5b40fb75
commit 59748e653b
4 changed files with 124 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
openbsc/include/openbsc/gb_proxy.h
View File

@ -85,6 +85,9 @@ struct gbproxy_tlli_info {
struct llist_head list;
uint32_t tlli;
uint32_t assigned_tlli;
int bss_validated;
int net_validated;
time_t timestamp;
uint8_t *mi_data;
size_t mi_data_len;
@ -124,6 +127,8 @@ int gbprox_cleanup_peers(struct gbproxy_config *cfg, uint16_t nsei, uint16_t bvc
struct gbproxy_peer *gbprox_peer_by_nsei(struct gbproxy_config *cfg, uint16_t nsei);
struct gbproxy_tlli_info *gbprox_find_tlli(struct gbproxy_peer *peer,
uint32_t tlli);
struct gbproxy_tlli_info *gbprox_find_tlli_by_mi(struct gbproxy_peer *peer,
const uint8_t *mi_data,
size_t mi_data_len);

57
openbsc/src/gprs/gb_proxy.c
View File

@ -420,14 +420,14 @@ struct gbproxy_parse_context {
int pdu_type;
};
static struct gbproxy_tlli_info *gbprox_find_tlli(struct gbproxy_peer *peer,
uint32_t tlli)
struct gbproxy_tlli_info *gbprox_find_tlli(struct gbproxy_peer *peer,
uint32_t tlli)
{
struct gbproxy_tlli_info *tlli_info;
struct gbproxy_patch_state *state = &peer->patch_state;
llist_for_each_entry(tlli_info, &state->enabled_tllis, list)
if (tlli_info->tlli == tlli)
if (tlli_info->tlli == tlli || tlli_info->assigned_tlli == tlli)
return tlli_info;
return NULL;
@ -659,8 +659,41 @@ void gbprox_reassign_tlli(struct gbproxy_tlli_info *tlli_info,
"The TLLI has been reassigned from %08x to %08x\n",
tlli_info->tlli, new_tlli);
/* TODO: Save old TLLI */
tlli_info->tlli = new_tlli;
/* Remember assigned TLLI */
tlli_info->assigned_tlli = new_tlli;
tlli_info->bss_validated = 0;
tlli_info->net_validated = 0;
}
static void gbprox_validate_tlli(struct gbproxy_tlli_info *tlli_info,
uint32_t tlli, int to_bss)
{
LOGP(DGPRS, LOGL_DEBUG,
"%s({tlli = %08x, assigned_tlli = %08x, net_vld = %d, bss_vld = %d}, %08x)\n",
__func__, tlli_info->tlli, tlli_info->assigned_tlli,
tlli_info->net_validated, tlli_info->bss_validated, tlli);
if (!tlli_info->assigned_tlli || tlli_info->assigned_tlli != tlli)
return;
if (gprs_tlli_type(tlli) != TLLI_LOCAL)
return;
/* See GSM 04.08, 4.7.1.5 */
if (to_bss)
tlli_info->net_validated = 1;
else
tlli_info->bss_validated = 1;
if (!tlli_info->bss_validated || !tlli_info->net_validated)
return;
LOGP(DGPRS, LOGL_INFO,
"The TLLI %08x has been validated (was %08x)\n",
tlli_info->assigned_tlli, tlli_info->tlli);
tlli_info->tlli = tlli;
tlli_info->assigned_tlli = 0;
}
void gbprox_touch_tlli(struct gbproxy_peer *peer,
@ -1429,10 +1462,16 @@ static struct gbproxy_tlli_info *gbprox_update_state(
parse_ctx->imsi_len, now);
}
} else if (parse_ctx->tlli_enc && parse_ctx->llc) {
tlli_info =
gbprox_register_tlli(peer, parse_ctx->tlli,
parse_ctx->imsi,
parse_ctx->imsi_len, now);
if (!tlli_info) {
tlli_info =
gbprox_register_tlli(peer, parse_ctx->tlli,
parse_ctx->imsi,
parse_ctx->imsi_len, now);
} else {
gbprox_validate_tlli(tlli_info, parse_ctx->tlli,
parse_ctx->to_bss);
gbprox_touch_tlli(peer, tlli_info, now);
}
} else if (tlli_info) {
gbprox_touch_tlli(peer, tlli_info, now);
}

57
openbsc/tests/gbproxy/gbproxy_test.c
View File

@ -25,6 +25,7 @@
#include <osmocom/core/signal.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/gsm/tlv.h>
#include <osmocom/gsm/gsm_utils.h>
#include <osmocom/gprs/gprs_msgb.h>
#include <osmocom/gprs/gprs_ns.h>
#include <osmocom/gprs/gprs_bssgp.h>
@ -124,10 +125,12 @@ static int dump_peers(FILE *stream, int indent, time_t now,
} else {
snprintf(mi_buf, sizeof(mi_buf), "(none)");
}
rc = fprintf(stream,
"%*s TLLI %08x, IMSI %s, AGE %d\n",
indent, "",
tlli_info->tlli, mi_buf, (int)age);
fprintf(stream, "%*s TLLI %08x",
indent, "", tlli_info->tlli);
if (tlli_info->assigned_tlli)
fprintf(stream, "/%08x", tlli_info->assigned_tlli);
rc = fprintf(stream, ", IMSI %s, AGE %d\n",
mi_buf, (int)age);
if (rc < 0)
return rc;
}
@ -181,6 +184,14 @@ static const unsigned char bssgp_attach_acc[88] = {
0xf4, 0xef, 0xe2, 0xb7, 0x00, 0x42, 0x67, 0x9a
};
/* Base Station Subsystem GPRS Protocol: GSM A-I/F DTAP - Attach Complete */
static const unsigned char bssgp_attach_complete[] = {
0x01, 0xef, 0xe2, 0xb7, 0x00, 0x00, 0x00, 0x04,
0x08, 0x88, 0x11, 0x22, 0x33, 0x40, 0x50, 0x60,
0x75, 0x30, 0x00, 0x80, 0x0e, 0x00, 0x08, 0x01,
0xc0, 0x11, 0x08, 0x03, 0xff, 0xff, 0xff
};
/* Base Station Subsystem GPRS Protocol: GSM A-I/F DTAP - GMM Information */
static const unsigned char bssgp_gmm_information[66] = {
0x00, 0xef, 0xe2, 0xb7, 0x00, 0x00, 0x50, 0x20,
@ -970,6 +981,12 @@ static void test_gbproxy_ra_patching()
struct gprs_ra_id rai_unknown =
{.mcc = 1, .mnc = 99, .lac = 99, .rac = 96};
const char *err_msg = NULL;
const uint32_t ptmsi = 0xefe2b700;
const uint32_t local_tlli = 0xefe2b700;
struct gbproxy_tlli_info *tlli_info;
struct gbproxy_peer *peer;
OSMO_ASSERT(local_tlli == gprs_tmsi2tlli(ptmsi, TLLI_LOCAL));
bssgp_nsi = nsi;
gbcfg.nsi = bssgp_nsi;
@ -1003,6 +1020,9 @@ static void test_gbproxy_ra_patching()
gprs_dump_nsi(nsi);
dump_peers(stdout, 0, 0, &gbcfg);
peer = gbprox_peer_by_nsei(&gbcfg, 0x1000);
OSMO_ASSERT(peer != NULL);
send_bssgp_reset_ack(nsi, &sgsn_peer, 0x1002);
send_bssgp_suspend(nsi, &bss_peer[0], &rai_bss);
@ -1025,14 +1045,43 @@ static void test_gbproxy_ra_patching()
send_ns_unitdata(nsi, "ATTACH ACCEPT", &sgsn_peer, 0x1002,
bssgp_attach_acc, sizeof(bssgp_attach_acc));
tlli_info = gbprox_find_tlli(peer, local_tlli);
OSMO_ASSERT(tlli_info);
OSMO_ASSERT(tlli_info->assigned_tlli == local_tlli);
OSMO_ASSERT(tlli_info->tlli != local_tlli);
OSMO_ASSERT(!tlli_info->bss_validated);
OSMO_ASSERT(!tlli_info->net_validated);
send_ns_unitdata(nsi, "ATTACH COMPLETE", &bss_peer[0], 0x1002,
bssgp_attach_complete, sizeof(bssgp_attach_complete));
tlli_info = gbprox_find_tlli(peer, local_tlli);
OSMO_ASSERT(tlli_info);
OSMO_ASSERT(tlli_info->assigned_tlli == local_tlli);
OSMO_ASSERT(tlli_info->tlli != local_tlli);
OSMO_ASSERT(tlli_info->bss_validated);
OSMO_ASSERT(!tlli_info->net_validated);
/* Replace APN (1) */
send_ns_unitdata(nsi, "ACT PDP CTX REQ (REPLACE APN)",
&bss_peer[0], 0x1002,
bssgp_act_pdp_ctx_req, sizeof(bssgp_act_pdp_ctx_req));
tlli_info = gbprox_find_tlli(peer, local_tlli);
OSMO_ASSERT(tlli_info);
OSMO_ASSERT(tlli_info->assigned_tlli == local_tlli);
OSMO_ASSERT(tlli_info->tlli != local_tlli);
OSMO_ASSERT(tlli_info->bss_validated);
OSMO_ASSERT(!tlli_info->net_validated);
send_ns_unitdata(nsi, "GMM INFO", &sgsn_peer, 0x1002,
bssgp_gmm_information, sizeof(bssgp_gmm_information));
tlli_info = gbprox_find_tlli(peer, local_tlli);
OSMO_ASSERT(tlli_info);
OSMO_ASSERT(tlli_info->assigned_tlli == 0);
OSMO_ASSERT(tlli_info->tlli == local_tlli);
/* Replace APN (2) */
send_ns_unitdata(nsi, "ACT PDP CTX REQ (REPLACE APN)",
&bss_peer[0], 0x1002,

24
openbsc/tests/gbproxy/gbproxy_test.ok
View File

@ -1677,6 +1677,18 @@ MESSAGE to BSS at 0x01020304:1111, msg length 92
result (ATTACH ACCEPT) = 92
PROCESSING ATTACH COMPLETE from 0x01020304:1111
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 08 01 c0 11 08 03 ff ff ff
CALLBACK, event 0, msg length 31, bvci 0x1002
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 08 01 c0 11 08 03 ff ff ff
NS UNITDATA MESSAGE to SGSN, BVCI 0x1002, msg length 31 (gprs_ns_sendmsg)
MESSAGE to SGSN at 0x05060708:32000, msg length 35
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 08 01 c0 11 08 03 ff ff ff
result (ATTACH COMPLETE) = 35
PROCESSING ACT PDP CTX REQ (REPLACE APN) from 0x01020304:1111
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
@ -1727,7 +1739,7 @@ result (ACT PDP CTX REQ (REMOVE APN)) = 75
Peers:
NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
RAID patched (BSS ): 8
RAID patched (BSS ): 9
RAID patched (SGSN): 2
APN patched : 3
Attach Request count : 1
@ -1760,7 +1772,7 @@ result (DETACH ACC) = 71
Peers:
NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
RAID patched (BSS ): 9
RAID patched (BSS ): 10
RAID patched (SGSN): 2
APN patched : 3
Attach Request count : 1
@ -1805,13 +1817,13 @@ result (ACT PDP CTX REQ (REMOVE APN)) = 75
Peers:
NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
RAID patched (BSS ): 12
RAID patched (BSS ): 13
RAID patched (SGSN): 3
APN patched : 4
Attach Request count : 1
TLLI cache size : 1
TLLI-Cache: 1
TLLI efe2b700, IMSI 12131415161718, AGE 0
TLLI bbc54679/efe2b700, IMSI 12131415161718, AGE 0
PROCESSING DETACH REQ (PWR OFF) from 0x01020304:1111
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 15 01 c0 19 08 05 09 18 05 f4 ef e2 b7 00 19 03 b9 97 cb 84 0c eb
@ -1827,7 +1839,7 @@ result (DETACH REQ (PWR OFF)) = 48
Gbproxy global:
Peers:
NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
RAID patched (BSS ): 13
RAID patched (BSS ): 14
RAID patched (SGSN): 3
APN patched : 4
Attach Request count : 1
@ -1865,7 +1877,7 @@ Gbproxy global:
Patch error: no peer : 1
Peers:
NSEI 4096, BVCI 4098, not blocked, RAI 112-332-16464-96
RAID patched (BSS ): 14
RAID patched (BSS ): 15
RAID patched (SGSN): 3
APN patched : 4
Attach Request count : 1