mirror of https://gerrit.osmocom.org/libosmocore
ns: Force a defined state when sending NS RESET
Currently the state is assumed to remain the same while the reset procedure is active. While this works correctly in general, a single unexpected BLOCK_ACK or UNBLOCK_ACK can change the state but will not stop the reset procedure. The leads to repeated RESET messages, where the corresponding RESET_ACK is ignored. This is a stable state which can only be left by manual intervention or by reception of a RESET message from the peer. This commit changes the RESET timeout handler to set the state to BLOCKED/RESET when sending the new NS RESET message. Note that this should ensure a clean restart even if the state has been screwed up. It does not fix the handling of BLOCK_ACK or UNBLOCK_ACK in abnormal cases. Addresses: gprs_ns.c:349 NSEI=8895 Tx NS RESET (NSVCI=8895, cause=O&M intervention) gprs_ns.c:878 NSVCI=8895 Rx NS RESET ACK (NSEI=8895, NSVCI=8895) gprs_ns.c:887 NS RESET ACK Discarding unexpected message for NS-VCI 8895 from SGSN NSEI=8895 Ticket: OW#1551 Sponsored-by: On-Waves ehf
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@ -559,6 +559,12 @@ static void gprs_ns_timer_cb(void *data)
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nsvc_start_timer(nsvc, NSVC_TIMER_TNS_ALIVE);
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break;
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case NSVC_TIMER_TNS_RESET:
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if (!(nsvc->state & NSE_S_RESET))
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LOGP(DNS, LOGL_NOTICE,
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"NSEI=%u Reset timed out but RESET flag is not set\n",
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nsvc->nsei);
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/* Mark NS-VC locally as blocked and dead */
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nsvc->state = NSE_S_BLOCKED | NSE_S_RESET;
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/* Chapter 7.3: Re-send the RESET */
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gprs_ns_tx_reset(nsvc, NS_CAUSE_OM_INTERVENTION);
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/* Re-start Tns-reset timer */
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@ -710,6 +710,24 @@ static void test_bss_reset_ack()
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send_ns_reset_ack(nsi, nse[0], 0xf001, 0x1000);
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gprs_dump_nsi(nsi);
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/* Test crossing RESET and UNBLOCK_ACK */
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printf("--- RESET (BSS -> SGSN) crossing an UNBLOCK_ACK (SGSN -> BSS) ---\n\n");
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setup_ns(nsi, nse[0], 0x1001, 0x1000);
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nsvc = gprs_nsvc_by_nsvci(nsi, 0x1001);
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gprs_nsvc_reset(nsvc, NS_CAUSE_OM_INTERVENTION);
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OSMO_ASSERT(nsvc->state & NSE_S_BLOCKED);
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OSMO_ASSERT(nsvc->state & NSE_S_RESET);
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send_ns_unblock_ack(nsi, nse[0]);
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gprs_dump_nsi(nsi);
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send_ns_reset_ack(nsi, nse[0], 0x1001, 0x1000);
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expire_nsvc_timer(nsvc);
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OSMO_ASSERT(nsvc->state & NSE_S_BLOCKED);
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OSMO_ASSERT(nsvc->state & NSE_S_RESET);
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send_ns_reset_ack(nsi, nse[0], 0x1001, 0x1000);
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gprs_dump_nsi(nsi);
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gprs_ns_destroy(nsi);
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nsi = NULL;
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}
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@ -569,6 +569,90 @@ Current NS-VCIs:
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NS-VC replaced other count: 2
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NS-VC changed NSEI count : 3
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--- RESET (BSS -> SGSN) crossing an UNBLOCK_ACK (SGSN -> BSS) ---
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Setup NS-VC: remote 0x01020304:2222, NSVCI 0x1001(4097), NSEI 0x1000(4096)
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PROCESSING RESET from 0x01020304:2222
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02 00 81 01 01 82 10 01 04 82 10 00
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==> got signal NS_REPLACED: 0x1001/0.0.0.0:0 -> 0xf001/1.2.3.4:2222
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==> got signal NS_RESET, NS-VC 0x1001/1.2.3.4:2222
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MESSAGE to BSS, msg length 9
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03 01 82 10 01 04 82 10 00
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MESSAGE to BSS, msg length 1
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0a
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result (RESET) = 9
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PROCESSING ALIVE from 0x01020304:2222
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0a
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MESSAGE to BSS, msg length 1
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0b
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result (ALIVE) = 1
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PROCESSING UNBLOCK from 0x01020304:2222
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06
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==> got signal NS_UNBLOCK, NS-VC 0x1001/1.2.3.4:2222
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MESSAGE to BSS, msg length 1
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07
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result (UNBLOCK) = 1
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PROCESSING ALIVE_ACK from 0x01020304:2222
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0b
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result (ALIVE_ACK) = 0
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MESSAGE to BSS, msg length 12
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02 00 81 01 01 82 10 01 04 82 10 00
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PROCESSING UNBLOCK_ACK from 0x01020304:2222
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07
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==> got signal NS_UNBLOCK, NS-VC 0x1001/1.2.3.4:2222
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result (UNBLOCK_ACK) = 0
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Current NS-VCIs:
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VCI 0xf001, NSEI 0x1000, peer 0x00000000:0, blocked
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NS-VC Block count : 1
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NS-VC replaced other count: 2
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VCI 0x2001, NSEI 0x2000, peer 0x01020304:1111
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VCI 0x1001, NSEI 0x1000, peer 0x01020304:2222
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NS-VC Block count : 4
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NS-VC replaced other count: 3
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NS-VC changed NSEI count : 4
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PROCESSING RESET_ACK from 0x01020304:2222
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03 01 82 10 01 04 82 10 00
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result (RESET_ACK) = 0
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MESSAGE to BSS, msg length 12
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02 00 81 01 01 82 10 01 04 82 10 00
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PROCESSING RESET_ACK from 0x01020304:2222
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03 01 82 10 01 04 82 10 00
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MESSAGE to BSS, msg length 1
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0a
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result (RESET_ACK) = 1
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Current NS-VCIs:
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VCI 0xf001, NSEI 0x1000, peer 0x00000000:0, blocked
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NS-VC Block count : 1
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NS-VC replaced other count: 2
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VCI 0x2001, NSEI 0x2000, peer 0x01020304:1111
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VCI 0x1001, NSEI 0x1000, peer 0x01020304:2222, blocked
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NS-VC Block count : 5
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NS-VC replaced other count: 3
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NS-VC changed NSEI count : 4
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Current NS-VCIs:
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--- Setup SGSN connection, BSS -> SGSN ---
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