diff options
Diffstat (limited to 'src/gb')
| -rw-r--r-- | src/gb/Makefile.am | 2 | ||||
| -rw-r--r-- | src/gb/gb_internal.h | 13 | ||||
| -rw-r--r-- | src/gb/gprs_ns.c | 253 | ||||
| -rw-r--r-- | src/gb/gprs_ns_sns.c | 772 | ||||
| -rw-r--r-- | src/gb/gprs_ns_vty.c | 10 | ||||
| -rw-r--r-- | src/gb/libosmogb.map | 1 |
6 files changed, 1034 insertions, 17 deletions
diff --git a/src/gb/Makefile.am b/src/gb/Makefile.am index d074092e..3180f9c1 100644 --- a/src/gb/Makefile.am +++ b/src/gb/Makefile.am @@ -17,7 +17,7 @@ libosmogb_la_LIBADD = $(TALLOC_LIBS) \ $(top_builddir)/src/vty/libosmovty.la \ $(top_builddir)/src/gsm/libosmogsm.la -libosmogb_la_SOURCES = gprs_ns.c gprs_ns_frgre.c gprs_ns_vty.c \ +libosmogb_la_SOURCES = gprs_ns.c gprs_ns_frgre.c gprs_ns_vty.c gprs_ns_sns.c \ gprs_bssgp.c gprs_bssgp_util.c gprs_bssgp_vty.c \ gprs_bssgp_bss.c common_vty.c endif diff --git a/src/gb/gb_internal.h b/src/gb/gb_internal.h index 72d940f5..cc7222e8 100644 --- a/src/gb/gb_internal.h +++ b/src/gb/gb_internal.h @@ -4,7 +4,17 @@ #include <osmocom/gsm/tlv.h> #include <osmocom/gprs/gprs_ns.h> +/* gprs_ns_sns.c */ +int gprs_ns_rx_sns(struct gprs_ns_inst *nsi, struct msgb *msg, struct tlv_parsed *tp); + +struct osmo_fsm_inst *gprs_sns_bss_fsm_alloc(void *ctx, struct gprs_nsvc *nsvc, const char *id); +int gprs_sns_bss_fsm_start(struct gprs_ns_inst *nsi); + +int gprs_sns_init(void); + +/* gprs_ns.c */ void gprs_nsvc_start_test(struct gprs_nsvc *nsvc); +void gprs_start_alive_all_nsvcs(struct gprs_ns_inst *nsi); int gprs_ns_tx_sns_ack(struct gprs_nsvc *nsvc, uint8_t trans_id, uint8_t *cause, const struct gprs_ns_ie_ip4_elem *ip4_elems,unsigned int num_ip4_elems); @@ -18,3 +28,6 @@ int gprs_ns_tx_sns_size(struct gprs_nsvc *nsvc, bool reset_flag, uint16_t max_nr uint16_t *ip4_ep_nr, uint16_t *ip6_ep_nr); int gprs_ns_tx_sns_size_ack(struct gprs_nsvc *nsvc, uint8_t *cause); + +struct vty; +void gprs_sns_dump_vty(struct vty *vty, const struct gprs_ns_inst *nsi, bool stats); diff --git a/src/gb/gprs_ns.c b/src/gb/gprs_ns.c index ad68bc99..33de2c1a 100644 --- a/src/gb/gprs_ns.c +++ b/src/gb/gprs_ns.c @@ -72,6 +72,7 @@ #include <sys/socket.h> #include <arpa/inet.h> +#include <osmocom/core/fsm.h> #include <osmocom/core/msgb.h> #include <osmocom/core/byteswap.h> #include <osmocom/gsm/tlv.h> @@ -93,6 +94,18 @@ #define ns_set_remote_state(ns_, st_) ns_set_state_with_log(ns_, st_, true, __FILE__, __LINE__) #define ns_mark_blocked(ns_) ns_set_state(ns_, (ns_)->state | NSE_S_BLOCKED) #define ns_mark_unblocked(ns_) ns_set_state(ns_, (ns_)->state & (~NSE_S_BLOCKED)); +#define ns_mark_alive(ns_) ns_set_state(ns_, (ns_)->state | NSE_S_ALIVE) +#define ns_mark_dead(ns_) ns_set_state(ns_, (ns_)->state & (~NSE_S_ALIVE)); + +#define ERR_IF_NSVC_USES_SNS(nsvc, reason) \ + do { \ + if ((nsvc)->nsi->bss_sns_fi) { \ + LOGP(DNS, LOGL_ERROR, "NSEI=%u Asked to %s. Rejected on IP-SNS\n", \ + nsvc->nsei, reason); \ + osmo_log_backtrace(DNS, LOGL_ERROR); \ + return -EIO; \ + } \ + } while (0) static const struct tlv_definition ns_att_tlvdef = { .def = { @@ -107,6 +120,9 @@ static const struct tlv_definition ns_att_tlvdef = { [NS_IE_IPv4_EP_NR] = { TLV_TYPE_FIXED, 2 }, [NS_IE_IPv6_EP_NR] = { TLV_TYPE_FIXED, 2 }, [NS_IE_RESET_FLAG] = { TLV_TYPE_TV, 0 }, + /* TODO: IP_ADDR can be 5 or 17 bytes long, depending on first byte. This + * cannot be expressed in our TLV parser. However, we don't do IPv6 anyway */ + [NS_IE_IP_ADDR] = { TLV_TYPE_FIXED, 5 }, }, }; @@ -171,6 +187,7 @@ const struct value_string gprs_ns_signal_ns_names[] = { { S_NS_ALIVE_EXP, "NS-ALIVE expired" }, { S_NS_REPLACED, "NSVC replaced" }, { S_NS_MISMATCH, "Unexpected IE" }, + { S_SNS_CONFIGURED, "SNS Configured" }, { 0, NULL } }; @@ -237,11 +254,20 @@ struct gprs_nsvc *gprs_nsvc_by_nsei(struct gprs_ns_inst *nsi, uint16_t nsei) return NULL; } +/*! Determine active NS-VC for given NSEI + BVCI. + * Use this function to determine which of the NS-VCs inside the NS Instance + * shall be used to transmit data for given NSEI + BVCI */ static struct gprs_nsvc *gprs_active_nsvc_by_nsei(struct gprs_ns_inst *nsi, - uint16_t nsei) + uint16_t nsei, uint16_t bvci) { struct gprs_nsvc *nsvc; llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { + /* if signalling BVCI, skip any NSVC with signalling weight == 0 */ + if (bvci == 0 && nsvc->sig_weight == 0) + continue; + /* if point-to-point BVCI, skip any NSVC with data weight == 0 */ + if (bvci != 0 && nsvc->data_weight == 0) + continue; if (nsvc->nsei == nsei) { if (!(nsvc->state & NSE_S_BLOCKED) && nsvc->state & NSE_S_ALIVE) @@ -251,9 +277,11 @@ static struct gprs_nsvc *gprs_active_nsvc_by_nsei(struct gprs_ns_inst *nsi, return NULL; } -/* Lookup struct gprs_nsvc based on remote peer socket addr */ -static struct gprs_nsvc *nsvc_by_rem_addr(struct gprs_ns_inst *nsi, - struct sockaddr_in *sin) +/*! Lookup NS-VC based on specified remote peer socket addr. + * \param[in] nsi NS Instance within which we shall look up the NS-VC + * \param[in] sin Remote peer Socket Address (IP + UDP Port) + * \returns NS-VC matching the given peer; NULL in case of none */ +struct gprs_nsvc *gprs_nsvc_by_rem_addr(struct gprs_ns_inst *nsi, const struct sockaddr_in *sin) { struct gprs_nsvc *nsvc; llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { @@ -267,27 +295,52 @@ static struct gprs_nsvc *nsvc_by_rem_addr(struct gprs_ns_inst *nsi, static void gprs_ns_timer_cb(void *data); -struct gprs_nsvc *gprs_nsvc_create(struct gprs_ns_inst *nsi, uint16_t nsvci) +/*! Create a new NS-VC (Virtual Circuit) within given instance + * \param[in] nsi NS Instance in which to create the NSVC + * \param[in] nsvci] NS Virtual Connection Identifier for this NSVC + * \param[in] sig_weight Signalling Weight of this NS-VC. Use "0" for no signalling + * \param[in] data_weight Data WEight of this NS-VC. Use "0" for no data + * \returns newly-created gprs_nsvc within nsi. NULL on error. */ +struct gprs_nsvc *gprs_nsvc_create2(struct gprs_ns_inst *nsi, uint16_t nsvci, + uint8_t sig_weight, uint8_t data_weight) { struct gprs_nsvc *nsvc; + if (gprs_nsvc_by_nsvci(nsi, nsvci)) { + LOGP(DNS, LOGL_ERROR, "Cannot create NS-VC for already-existing NSVCI=%u\n", nsvci); + return NULL; + } + LOGP(DNS, LOGL_INFO, "NSVCI=%u Creating NS-VC\n", nsvci); nsvc = talloc_zero(nsi, struct gprs_nsvc); + if (!nsvc) + return NULL; nsvc->nsvci = nsvci; nsvc->nsvci_is_valid = 1; /* before RESET procedure: BLOCKED and DEAD */ - ns_set_state(nsvc, NSE_S_BLOCKED); + if (nsi->bss_sns_fi) + ns_set_state(nsvc, 0); + else + ns_set_state(nsvc, NSE_S_BLOCKED); nsvc->nsi = nsi; osmo_timer_setup(&nsvc->timer, gprs_ns_timer_cb, nsvc); nsvc->ctrg = rate_ctr_group_alloc(nsvc, &nsvc_ctrg_desc, nsvci); nsvc->statg = osmo_stat_item_group_alloc(nsvc, &nsvc_statg_desc, nsvci); + nsvc->sig_weight = sig_weight; + nsvc->data_weight = data_weight; llist_add(&nsvc->list, &nsi->gprs_nsvcs); return nsvc; } +/*! Old API for creating a NS-VC. Uses gprs_nsvc_create2 with fixed weights. */ +struct gprs_nsvc *gprs_nsvc_create(struct gprs_ns_inst *nsi, uint16_t nsvci) +{ + return gprs_nsvc_create2(nsi, nsvci, 1, 1); +} + /*! Delete given NS-VC * \param[in] nsvc gprs_nsvc to be deleted */ @@ -450,13 +503,16 @@ static int gprs_ns_tx_simple(struct gprs_nsvc *nsvc, uint8_t pdu_type) */ int gprs_ns_tx_reset(struct gprs_nsvc *nsvc, uint8_t cause) { - struct msgb *msg = gprs_ns_msgb_alloc(); + struct msgb *msg; struct gprs_ns_hdr *nsh; uint16_t nsvci = osmo_htons(nsvc->nsvci); uint16_t nsei = osmo_htons(nsvc->nsei); log_set_context(LOG_CTX_GB_NSVC, nsvc); + ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET"); + + msg = gprs_ns_msgb_alloc(); if (!msg) return -ENOMEM; @@ -536,12 +592,15 @@ int gprs_ns_tx_status(struct gprs_nsvc *nsvc, uint8_t cause, */ int gprs_ns_tx_block(struct gprs_nsvc *nsvc, uint8_t cause) { - struct msgb *msg = gprs_ns_msgb_alloc(); + struct msgb *msg; struct gprs_ns_hdr *nsh; uint16_t nsvci = osmo_htons(nsvc->nsvci); log_set_context(LOG_CTX_GB_NSVC, nsvc); + ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK"); + + msg = gprs_ns_msgb_alloc(); if (!msg) return -ENOMEM; @@ -574,6 +633,8 @@ static int gprs_ns_tx_block_ack(struct gprs_nsvc *nsvc) log_set_context(LOG_CTX_GB_NSVC, nsvc); + ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS BLOCK ACK"); + msg = gprs_ns_msgb_alloc(); if (!msg) return -ENOMEM; @@ -597,6 +658,9 @@ static int gprs_ns_tx_block_ack(struct gprs_nsvc *nsvc) int gprs_ns_tx_unblock(struct gprs_nsvc *nsvc) { log_set_context(LOG_CTX_GB_NSVC, nsvc); + + ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS UNBLOCK"); + LOGP(DNS, LOGL_INFO, "NSEI=%u Tx NS UNBLOCK (NSVCI=%u)\n", nsvc->nsei, nsvc->nsvci); @@ -687,16 +751,21 @@ static void gprs_ns_timer_cb(void *data) nsvc->alive_retries++; if (nsvc->alive_retries > nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]) { - /* mark as dead and blocked */ - ns_set_state(nsvc, NSE_S_BLOCKED); - rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]); + /* mark as dead (and blocked unless IP-SNS) */ rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_DEAD]); + if (!nsvc->nsi->bss_sns_fi) { + ns_set_state(nsvc, NSE_S_BLOCKED); + rate_ctr_inc(&nsvc->ctrg->ctr[NS_CTR_BLOCKED]); + } else + ns_set_state(nsvc, 0); LOGP(DNS, LOGL_NOTICE, "NSEI=%u Tns-alive expired more then " "%u times, blocking NS-VC\n", nsvc->nsei, nsvc->nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES]); ns_osmo_signal_dispatch(nsvc, S_NS_ALIVE_EXP, 0); - ns_osmo_signal_dispatch(nsvc, S_NS_BLOCK, NS_CAUSE_NSVC_BLOCKED); + /* FIXME: should we send this signal in case of SNS? */ + if (!nsvc->nsi->bss_sns_fi) + ns_osmo_signal_dispatch(nsvc, S_NS_BLOCK, NS_CAUSE_NSVC_BLOCKED); return; } /* Tns-test case: send NS-ALIVE PDU */ @@ -733,11 +802,15 @@ static void gprs_ns_timer_cb(void *data) /* Section 9.2.6 */ static int gprs_ns_tx_reset_ack(struct gprs_nsvc *nsvc) { - struct msgb *msg = gprs_ns_msgb_alloc(); + struct msgb *msg; struct gprs_ns_hdr *nsh; uint16_t nsvci, nsei; log_set_context(LOG_CTX_GB_NSVC, nsvc); + + ERR_IF_NSVC_USES_SNS(nsvc, "transmit NS RESET ACK"); + + msg = gprs_ns_msgb_alloc(); if (!msg) return -ENOMEM; @@ -777,6 +850,13 @@ int gprs_ns_tx_sns_ack(struct gprs_nsvc *nsvc, uint8_t trans_id, uint8_t *cause, if (!msg) return -ENOMEM; + if (!nsvc->nsi->bss_sns_fi) { + LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", + nsvc->nsei); + msgb_free(msg); + return -EIO; + } + nsei = osmo_htons(nsvc->nsei); msg->l2h = msgb_put(msg, sizeof(*nsh)); @@ -815,6 +895,13 @@ int gprs_ns_tx_sns_config(struct gprs_nsvc *nsvc, bool end_flag, if (!msg) return -ENOMEM; + if (!nsvc->nsi->bss_sns_fi) { + LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", + nsvc->nsei); + msgb_free(msg); + return -EIO; + } + nsei = osmo_htons(nsvc->nsei); msg->l2h = msgb_put(msg, sizeof(*nsh)); @@ -847,6 +934,13 @@ int gprs_ns_tx_sns_config_ack(struct gprs_nsvc *nsvc, uint8_t *cause) if (!msg) return -ENOMEM; + if (!nsvc->nsi->bss_sns_fi) { + LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", + nsvc->nsei); + msgb_free(msg); + return -EIO; + } + nsei = osmo_htons(nsvc->nsei); msg->l2h = msgb_put(msg, sizeof(*nsh)); @@ -880,6 +974,13 @@ int gprs_ns_tx_sns_size(struct gprs_nsvc *nsvc, bool reset_flag, uint16_t max_nr if (!msg) return -ENOMEM; + if (!nsvc->nsi->bss_sns_fi) { + LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", + nsvc->nsei); + msgb_free(msg); + return -EIO; + } + nsei = osmo_htons(nsvc->nsei); msg->l2h = msgb_put(msg, sizeof(*nsh)); @@ -912,6 +1013,13 @@ int gprs_ns_tx_sns_size_ack(struct gprs_nsvc *nsvc, uint8_t *cause) if (!msg) return -ENOMEM; + if (!nsvc->nsi->bss_sns_fi) { + LOGP(DNS, LOGL_ERROR, "NSEI=%u Cannot transmit SNS on NSVC without SNS active\n", + nsvc->nsei); + msgb_free(msg); + return -EIO; + } + nsei = osmo_htons(nsvc->nsei); msg->l2h = msgb_put(msg, sizeof(*nsh)); @@ -942,7 +1050,7 @@ int gprs_ns_sendmsg(struct gprs_ns_inst *nsi, struct msgb *msg) struct gprs_ns_hdr *nsh; uint16_t bvci = msgb_bvci(msg); - nsvc = gprs_active_nsvc_by_nsei(nsi, msgb_nsei(msg)); + nsvc = gprs_active_nsvc_by_nsei(nsi, msgb_nsei(msg), msgb_bvci(msg)); if (!nsvc) { int rc; if (gprs_nsvc_by_nsei(nsi, msgb_nsei(msg))) { @@ -1358,7 +1466,7 @@ int gprs_ns_rcvmsg(struct gprs_ns_inst *nsi, struct msgb *msg, int rc = 0; /* look up the NSVC based on source address */ - nsvc = nsvc_by_rem_addr(nsi, saddr); + nsvc = gprs_nsvc_by_rem_addr(nsi, saddr); if (!nsvc) { struct gprs_nsvc *fallback_nsvc; @@ -1572,6 +1680,7 @@ int gprs_ns_process_msg(struct gprs_ns_inst *nsi, struct msgb *msg, struct gprs_nsvc **nsvc) { struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; + struct tlv_parsed tp; int rc = 0; msgb_nsei(msg) = (*nsvc)->nsei; @@ -1594,6 +1703,7 @@ int gprs_ns_process_msg(struct gprs_ns_inst *nsi, struct msgb *msg, rc = gprs_ns_tx_alive_ack(*nsvc); break; case NS_PDUT_ALIVE_ACK: + ns_mark_alive(*nsvc); if ((*nsvc)->timer_mode == NSVC_TIMER_TNS_ALIVE) osmo_stat_item_set((*nsvc)->statg->items[NS_STAT_ALIVE_DELAY], nsvc_timer_elapsed_ms(*nsvc)); @@ -1648,15 +1758,68 @@ int gprs_ns_process_msg(struct gprs_ns_inst *nsi, struct msgb *msg, /* mark remote NS-VC as blocked + active */ ns_set_remote_state(*nsvc, NSE_S_BLOCKED | NSE_S_ALIVE); break; + case SNS_PDUT_CONFIG: + if (!nsi->bss_sns_fi) + goto unexpected_sns; + /* one additional byte ('end flag') before the TLV part starts */ + rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data+1, + msgb_l2len(msg) - sizeof(*nsh)-1, 0, 0); + if (rc < 0) { + LOGPC(DNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); + return rc; + } + /* All sub-network service related message types */ + rc = gprs_ns_rx_sns(nsi, msg, &tp); + break; + case SNS_PDUT_ACK: + case SNS_PDUT_ADD: + case SNS_PDUT_CHANGE_WEIGHT: + case SNS_PDUT_DELETE: + if (!nsi->bss_sns_fi) + goto unexpected_sns; + /* weird layout: NSEI TLV, then value-only transaction IE, then TLV again */ + rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data+5, + msgb_l2len(msg) - sizeof(*nsh)-5, 0, 0); + if (rc < 0) { + LOGPC(DNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); + return rc; + } + tp.lv[NS_IE_NSEI].val = nsh->data+2; + tp.lv[NS_IE_NSEI].len = 2; + tp.lv[NS_IE_TRANS_ID].val = nsh->data+4; + tp.lv[NS_IE_TRANS_ID].len = 1; + rc = gprs_ns_rx_sns(nsi, msg, &tp); + break; + case SNS_PDUT_CONFIG_ACK: + case SNS_PDUT_SIZE: + case SNS_PDUT_SIZE_ACK: + if (!nsi->bss_sns_fi) + goto unexpected_sns; + rc = tlv_parse(&tp, &ns_att_tlvdef, nsh->data, + msgb_l2len(msg) - sizeof(*nsh), 0, 0); + if (rc < 0) { + LOGPC(DNS, LOGL_NOTICE, "Error during TLV Parse in %s\n", msgb_hexdump(msg)); + return rc; + } + /* All sub-network service related message types */ + rc = gprs_ns_rx_sns(nsi, msg, &tp); + break; default: LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx Unknown NS PDU type 0x%02x\n", (*nsvc)->nsei, nsh->pdu_type); rc = -EINVAL; break; +unexpected_sns: + LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx %s for NS Instance that has no SNS!\n", + (*nsvc)->nsei, get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); + rc = -EINVAL; + break; } return rc; } +static bool gprs_sns_fsm_registered = false; + /*! Create a new GPRS NS instance * \param[in] cb Call-back function for incoming BSSGP data * \returns dynamically allocated gprs_ns_inst @@ -1665,6 +1828,11 @@ struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb, void *ctx) { struct gprs_ns_inst *nsi = talloc_zero(ctx, struct gprs_ns_inst); + if (!gprs_sns_fsm_registered) { + gprs_sns_init(); + gprs_sns_fsm_registered = true; + } + nsi->cb = cb; INIT_LLIST_HEAD(&nsi->gprs_nsvcs); nsi->timeout[NS_TOUT_TNS_BLOCK] = 3; @@ -1674,6 +1842,7 @@ struct gprs_ns_inst *gprs_ns_instantiate(gprs_ns_cb_t *cb, void *ctx) nsi->timeout[NS_TOUT_TNS_TEST] = 30; nsi->timeout[NS_TOUT_TNS_ALIVE] = 3; nsi->timeout[NS_TOUT_TNS_ALIVE_RETRIES] = 10; + nsi->timeout[NS_TOUT_TSNS_PROV] = 3; /* 1..10 */ /* Create the dummy NSVC that we use for sending * messages to non-existant/unknown NS-VC's */ @@ -1875,6 +2044,8 @@ int gprs_nsvc_reset(struct gprs_nsvc *nsvc, uint8_t cause) { int rc; + ERR_IF_NSVC_USES_SNS(nsvc, "RESET procedure based on API request"); + LOGP(DNS, LOGL_INFO, "NSEI=%u RESET procedure based on API request\n", nsvc->nsei); @@ -1909,7 +2080,7 @@ struct gprs_nsvc *gprs_ns_nsip_connect(struct gprs_ns_inst *nsi, { struct gprs_nsvc *nsvc; - nsvc = nsvc_by_rem_addr(nsi, dest); + nsvc = gprs_nsvc_by_rem_addr(nsi, dest); if (!nsvc) nsvc = gprs_nsvc_create(nsi, nsvci); nsvc->ip.bts_addr = *dest; @@ -1920,6 +2091,47 @@ struct gprs_nsvc *gprs_ns_nsip_connect(struct gprs_ns_inst *nsi, return nsvc; } +/*! Establish a NS connection (from the BSS) to the SGSN using SNS auto-configuration + * \param nsi NS-instance + * \param[in] dest Destination IP/Port + * \param[in] nsei NSEI of the to-be-established NS-VC + * \param[in] nsvci NSVCI of the to-be-established NS-VC + * \returns struct gprs_nsvc representing the new NS-VC + * + * This function will establish a single NS/UDP/IP connection in uplink + * (BSS to SGSN) direction. It will start with the SNS-SIZE procedure, + * followed by BSS-originated SNS-CONFIG, then SGSN-originated SNS-CONFIG. + * + * Once configuration completes, the user will be notified by the S_SNS_CONFIGURED signal, + * at which point he typically would want to initiate NS-RESET by means of gprs_nsvc_reset(). + */ +struct gprs_nsvc *gprs_ns_nsip_connect_sns(struct gprs_ns_inst *nsi, + struct sockaddr_in *dest, uint16_t nsei, + uint16_t nsvci) +{ + struct gprs_nsvc *nsvc; + + /* FIXME: We are getting the order wrong here. Normally, one would want + * to start the SNS FSM *before* creating any NS-VC and then create the NS-VC + * after the SNS layer has established the IP/port/etc. However, this would + * require some massive code and API changes compared to existing libosmogb, + * so let's keep the old logic. */ + nsvc = gprs_nsvc_by_rem_addr(nsi, dest); + if (!nsvc) + nsvc = gprs_nsvc_create(nsi, nsvci); + nsvc->ip.bts_addr = *dest; + nsvc->nsei = nsei; + nsvc->remote_end_is_sgsn = 1; + /* NSVCs are always UNBLOCKED in IP-SNS */ + ns_set_state(nsvc, 0); + + if (nsi->bss_sns_fi) + osmo_fsm_inst_term(nsi->bss_sns_fi, OSMO_FSM_TERM_REQUEST, NULL); + nsi->bss_sns_fi = gprs_sns_bss_fsm_alloc(nsi, nsvc, "NSIP"); + gprs_sns_bss_fsm_start(nsi); + return nsvc; +} + void gprs_ns_set_log_ss(int ss) { DNS = ss; @@ -1954,4 +2166,13 @@ void gprs_nsvc_start_test(struct gprs_nsvc *nsvc) nsvc_start_timer(nsvc, NSVC_TIMER_TNS_TEST); } +void gprs_start_alive_all_nsvcs(struct gprs_ns_inst *nsi) +{ + struct gprs_nsvc *nsvc; + llist_for_each_entry(nsvc, &nsi->gprs_nsvcs, list) { + /* start the test procedure */ + gprs_nsvc_start_test(nsvc); + } +} + /*! @} */ diff --git a/src/gb/gprs_ns_sns.c b/src/gb/gprs_ns_sns.c new file mode 100644 index 00000000..b0ee5d79 --- /dev/null +++ b/src/gb/gprs_ns_sns.c @@ -0,0 +1,772 @@ +/* Implementation of 3GPP TS 48.016 NS IP Sub-Network Service */ +/* (C) 2018 by Harald Welte <laforge@gnumonks.org> */ + +/* The BSS NSE only has one SGSN IP address configured, and it will use the SNS procedures + * to communicated its local IPs/ports as well as all the SGSN side IPs/ports and + * associated weights. In theory, the BSS then uses this to establish a full mesh + * of NSVCs between all BSS-side IPs/ports and SGSN-side IPs/ports */ + +#include <errno.h> + +#include <netinet/in.h> +#include <arpa/inet.h> + +#include <osmocom/core/fsm.h> +#include <osmocom/core/msgb.h> +#include <osmocom/core/signal.h> +#include <osmocom/core/socket.h> +#include <osmocom/gsm/tlv.h> +#include <osmocom/gprs/gprs_msgb.h> +#include <osmocom/gprs/gprs_ns.h> + +#include "common_vty.h" +#include "gb_internal.h" + +#define S(x) (1 << (x)) + +struct gprs_sns_state { + struct gprs_ns_inst *nsi; + struct gprs_nsvc *nsvc_hack; + + /* local configuration to send to the remote end */ + struct gprs_ns_ie_ip4_elem *ip4_local; + size_t num_ip4_local; + + /* local configuration about our capabilities in terms of connections to + * remote (SGSN) side */ + size_t num_max_nsvcs; + size_t num_max_ip4_remote; + + /* remote configuration as received */ + struct gprs_ns_ie_ip4_elem *ip4_remote; + unsigned int num_ip4_remote; + + /* IP-SNS based Gb doesn't have a NSVCI. However, our existing Gb stack + * requires a unique NSVCI per NS-VC. Let's simply allocate them dynamically from + * the maximum (65533), counting downwards */ + uint16_t next_nsvci; +}; + +static inline struct gprs_ns_inst *ns_inst_from_fi(struct osmo_fsm_inst *fi) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + return gss->nsi; +} + +/* helper function to compute the sum of all (data or signaling) weights */ +static int ip4_weight_sum(const struct gprs_ns_ie_ip4_elem *ip4, unsigned int num, + bool data_weight) +{ + unsigned int i; + int weight_sum = 0; + + for (i = 0; i < num; i++) { + if (data_weight) + weight_sum += ip4[i].data_weight; + else + weight_sum += ip4[i].sig_weight; + } + return weight_sum; +} +#define ip4_weight_sum_data(x,y) ip4_weight_sum(x, y, true) +#define ip4_weight_sum_sig(x,y) ip4_weight_sum(x, y, false) + +static struct gprs_nsvc *nsvc_by_ip4_elem(struct gprs_ns_inst *nsi, + const struct gprs_ns_ie_ip4_elem *ip4) +{ + struct sockaddr_in sin; + /* copy over. Both data structures use network byte order */ + sin.sin_addr.s_addr = ip4->ip_addr; + sin.sin_port = ip4->udp_port; + return gprs_nsvc_by_rem_addr(nsi, &sin); +} + +static struct gprs_nsvc *gprs_nsvc_create_ip4(struct gprs_ns_inst *nsi, + const struct gprs_ns_ie_ip4_elem *ip4) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) nsi->bss_sns_fi->priv; + struct gprs_nsvc *nsvc; + struct sockaddr_in sin; + /* copy over. Both data structures use network byte order */ + sin.sin_addr.s_addr = ip4->ip_addr; + sin.sin_port = ip4->udp_port; + + nsvc = gprs_nsvc_create2(nsi, gss->next_nsvci--, ip4->sig_weight, ip4->data_weight); + if (!nsvc) + return NULL; + + /* NSEI is the same across all NS-VCs */ + nsvc->nsei = gss->nsvc_hack->nsei; + nsvc->nsvci_is_valid = 0; + nsvc->ip.bts_addr = sin; + + return nsvc; +} + +static int create_missing_nsvcs(struct osmo_fsm_inst *fi) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + unsigned int i; + + for (i = 0; i < gss->num_ip4_remote; i++) { + const struct gprs_ns_ie_ip4_elem *ip4 = &gss->ip4_remote[i]; + struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4); + if (!nsvc) { + /* create, if it doesn't exist */ + nsvc = gprs_nsvc_create_ip4(nsi, ip4); + if (!nsvc) { + LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG: Failed to create NSVC\n"); + continue; + } + } else { + /* update data / signalling weight */ + nsvc->data_weight = ip4->data_weight; + nsvc->sig_weight = ip4->sig_weight; + } + LOGPFSML(fi, LOGL_INFO, "NS-VC %s data_weight=%u, sig_weight=%u\n", + gprs_ns_ll_str(nsvc), nsvc->data_weight, nsvc->sig_weight); + } + + return 0; +} + +/* Add a given remote IPv4 element to gprs_sns_state */ +static int add_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) +{ + if (gss->num_ip4_remote >= gss->num_max_ip4_remote) + return -E2BIG; + + gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote, struct gprs_ns_ie_ip4_elem, + gss->num_ip4_remote+1); + gss->ip4_remote[gss->num_ip4_remote] = *ip4; + gss->num_ip4_remote += 1; + return 0; +} + +/* Remove a given remote IPv4 element from gprs_sns_state */ +static int remove_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) +{ + unsigned int i; + + for (i = 0; i < gss->num_ip4_remote; i++) { + if (memcmp(&gss->ip4_remote[i], ip4, sizeof(*ip4))) + continue; + /* all array elements < i remain as they are; all > i are shifted left by one */ + memmove(&gss->ip4_remote[i], &gss->ip4_remote[i+1], gss->num_ip4_remote-i-1); + gss->num_ip4_remote -= 1; + return 0; + } + return -1; +} + +/* update the weights for specified remote IPv4 */ +static int update_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) +{ + unsigned int i; + + for (i = 0; i < gss->num_ip4_remote; i++) { + if (gss->ip4_remote[i].ip_addr != ip4->ip_addr || + gss->ip4_remote[i].udp_port != ip4->udp_port) + continue; + gss->ip4_remote[i].sig_weight = ip4->sig_weight; + gss->ip4_remote[i].data_weight = ip4->data_weight; + return 0; + } + return -1; +} + + +static int do_sns_change_weight(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4); + + /* TODO: Upon receiving an SNS-CHANGEWEIGHT PDU, if the resulting sum of the + * signalling weights of all the peer IP endpoints configured for this NSE is + * equal to zero or if the resulting sum of the data weights of all the peer IP + * endpoints configured for this NSE is equal to zero, the BSS/SGSN shall send an + * SNS-ACK PDU with a cause code of "Invalid weights". */ + + update_remote_ip4_elem(gss, ip4); + + if (!nsvc) { + LOGPFSML(fi, LOGL_NOTICE, "Couldn't find NS-VC for SNS-CHANGE_WEIGHT\n"); + return -NS_CAUSE_NSVC_UNKNOWN; + } + + LOGPFSML(fi, LOGL_INFO, "CHANGE-WEIGHT NS-VC %s data_weight %u->%u, sig_weight %u->%u\n", + gprs_ns_ll_str(nsvc), nsvc->data_weight, ip4->data_weight, + nsvc->sig_weight, ip4->sig_weight); + + nsvc->data_weight = ip4->data_weight; + nsvc->sig_weight = ip4->sig_weight; + + return 0; +} + +static int do_sns_delete(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4); + + if (remove_remote_ip4_elem(gss, ip4) < 0) + return -NS_CAUSE_UNKN_IP_EP; + + if (!nsvc) { + LOGPFSML(fi, LOGL_NOTICE, "Couldn't find NS-VC for SNS-DELETE\n"); + return -NS_CAUSE_NSVC_UNKNOWN; + } + LOGPFSML(fi, LOGL_INFO, "DELETE NS-VC %s\n", gprs_ns_ll_str(nsvc)); + gprs_nsvc_delete(nsvc); + + return 0; +} + +static int do_sns_add(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + struct gprs_nsvc *nsvc; + + /* Upon receiving an SNS-ADD PDU, if the consequent number of IPv4 endpoints + * exceeds the number of IPv4 endpoints supported by the NSE, the NSE shall send + * an SNS-ACK PDU with a cause code set to "Invalid number of IP4 Endpoints". */ + if (add_remote_ip4_elem(gss, ip4) < 0) + return -NS_CAUSE_INVAL_NR_NS_VC; + + /* Upon receiving an SNS-ADD PDU containing an already configured IP endpoint the + * NSE shall send an SNS-ACK PDU with the cause code "Protocol error - + * unspecified" */ + nsvc = nsvc_by_ip4_elem(nsi, ip4); + if (nsvc) + return -NS_CAUSE_PROTO_ERR_UNSPEC; + + nsvc = gprs_nsvc_create_ip4(nsi, ip4); + if (!nsvc) { + LOGPFSML(fi, LOGL_ERROR, "SNS-ADD: Failed to create NSVC\n"); + remove_remote_ip4_elem(gss, ip4); + return -NS_CAUSE_EQUIP_FAIL; + } + LOGPFSML(fi, LOGL_INFO, "ADD NS-VC %s data_weight=%u, sig_weight=%u\n", + gprs_ns_ll_str(nsvc), nsvc->data_weight, nsvc->sig_weight); + /* Start the test procedure for this new NS-VC */ + gprs_nsvc_start_test(nsvc); + return 0; +} + + + +/*********************************************************************** + * BSS-side FSM for IP Sub-Network Service + ***********************************************************************/ + +enum gprs_sns_bss_state { + GPRS_SNS_ST_UNCONFIGURED, + GPRS_SNS_ST_SIZE, /*!< SNS-SIZE procedure ongoing */ + GPRS_SNS_ST_CONFIG_BSS, /*!< SNS-CONFIG procedure (BSS->SGSN) ongoing */ + GPRS_SNS_ST_CONFIG_SGSN, /*!< SNS-CONFIG procedure (SGSN->BSS) ongoing */ + GPRS_SNS_ST_CONFIGURED, +}; + +enum gprs_sns_event { + GPRS_SNS_EV_START, + GPRS_SNS_EV_SIZE, + GPRS_SNS_EV_SIZE_ACK, + GPRS_SNS_EV_CONFIG, + GPRS_SNS_EV_CONFIG_END, /*!< SNS-CONFIG with end flag received */ + GPRS_SNS_EV_CONFIG_ACK, + GPRS_SNS_EV_ADD, + GPRS_SNS_EV_DELETE, + GPRS_SNS_EV_CHANGE_WEIGHT, +}; + +static const struct value_string gprs_sns_event_names[] = { + { GPRS_SNS_EV_START, "START" }, + { GPRS_SNS_EV_SIZE, "SIZE" }, + { GPRS_SNS_EV_SIZE_ACK, "SIZE_ACK" }, + { GPRS_SNS_EV_CONFIG, "CONFIG" }, + { GPRS_SNS_EV_CONFIG_END, "CONFIG_END" }, + { GPRS_SNS_EV_CONFIG_ACK, "CONFIG_ACK" }, + { GPRS_SNS_EV_ADD, "ADD" }, + { GPRS_SNS_EV_DELETE, "DELETE" }, + { GPRS_SNS_EV_CHANGE_WEIGHT, "CHANGE_WEIGHT" }, + { 0, NULL } +}; + +static void gprs_sns_st_unconfigured(struct osmo_fsm_inst *fi, uint32_t event, void *data) +{ + struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + switch (event) { + case GPRS_SNS_EV_START: + osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1); + break; + default: + OSMO_ASSERT(0); + } +} + +static void gprs_sns_st_size(struct osmo_fsm_inst *fi, uint32_t event, void *data) +{ + struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + struct tlv_parsed *tp = NULL; + + switch (event) { + case GPRS_SNS_EV_SIZE_ACK: + tp = data; + if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { + LOGPFSML(fi, LOGL_ERROR, "SNS-SIZE-ACK with cause %s\n", + gprs_ns_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); + /* FIXME: What to do? */ + } else { + osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS, + nsi->timeout[NS_TOUT_TSNS_PROV], 2); + } + break; + default: + OSMO_ASSERT(0); + } +} +static void gprs_sns_st_size_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + uint16_t num_max_ip4_remote = gss->num_max_ip4_remote; + + gprs_ns_tx_sns_size(gss->nsvc_hack, true, gss->num_max_nsvcs, &num_max_ip4_remote, NULL); +} + + +static void gprs_sns_st_config_bss(struct osmo_fsm_inst *fi, uint32_t event, void *data) +{ + //struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + //struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + struct tlv_parsed *tp = NULL; + + switch (event) { + case GPRS_SNS_EV_CONFIG_ACK: + tp = data; + if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { + LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG-ACK with cause %s\n", + gprs_ns_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); + /* FIXME: What to do? */ + } else { + osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_SGSN, 0, 0); + } + break; + default: + OSMO_ASSERT(0); + } +} +static void gprs_sns_st_config_bss_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + /* Transmit SNS-CONFIG */ + gprs_ns_tx_sns_config(gss->nsvc_hack, true, gss->ip4_local, gss->num_ip4_local); +} + +static void gprs_sns_st_config_sgsn(struct osmo_fsm_inst *fi, uint32_t event, void *data) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + struct tlv_parsed *tp = NULL; + struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); + const struct gprs_ns_ie_ip4_elem *v4_list; + unsigned int num_v4; + uint8_t cause; + + switch (event) { + case GPRS_SNS_EV_CONFIG_END: + case GPRS_SNS_EV_CONFIG: + tp = data; +#if 0 /* part of incoming SNS-SIZE (doesn't happen on BSS side */ + if (TLVP_PRESENT(tp, NS_IE_RESET_FLAG)) { + /* reset all existing config */ + if (gss->ip4_remote) + talloc_free(gss->ip4_remote); + gss->num_ip4_remote = 0; + } +#endif + if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { + cause = NS_CAUSE_INVAL_NR_IPv4_EP; + gprs_ns_tx_sns_config_ack(gss->nsvc_hack, &cause); + osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); + break; + } + v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); + num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); + /* realloc to the new size */ + gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote, + struct gprs_ns_ie_ip4_elem, + gss->num_ip4_remote+num_v4); + /* append the new entries to the end of the list */ + memcpy(&gss->ip4_remote[gss->num_ip4_remote], v4_list, num_v4*sizeof(*v4_list)); + gss->num_ip4_remote += num_v4; + + LOGPFSML(fi, LOGL_INFO, "Rx SNS-CONFIG: Remote IPv4 list now %u entries\n", + gss->num_ip4_remote); + if (event == GPRS_SNS_EV_CONFIG_END) { + /* check if sum of data / sig weights == 0 */ + if (ip4_weight_sum_data(gss->ip4_remote, gss->num_ip4_remote) == 0 || + ip4_weight_sum_sig(gss->ip4_remote, gss->num_ip4_remote) == 0) { + cause = NS_CAUSE_INVAL_WEIGH; + gprs_ns_tx_sns_config_ack(gss->nsvc_hack, &cause); + osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); + break; + } + create_missing_nsvcs(fi); + gprs_ns_tx_sns_config_ack(gss->nsvc_hack, NULL); + /* start the test procedure on ALL NSVCs! */ + gprs_start_alive_all_nsvcs(nsi); + osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, 0, 0); + } else { + /* just send CONFIG-ACK */ + gprs_ns_tx_sns_config_ack(gss->nsvc_hack, NULL); + } + break; + default: + OSMO_ASSERT(0); + } +} + +static void gprs_sns_st_configured(struct osmo_fsm_inst *fi, uint32_t event, void *data) +{ + struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; + struct tlv_parsed *tp = NULL; + const struct gprs_ns_ie_ip4_elem *v4_list = NULL; + unsigned int num_v4 = 0; + uint8_t trans_id; + uint8_t cause = 0xff; + unsigned int i; + int rc; + + switch (event) { + case GPRS_SNS_EV_ADD: + tp = data; + trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); + if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { + v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); + num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(* |