/* Implementation of 3GPP TS 48.016 NS IP Sub-Network Service */ /* (C) 2018 by Harald Welte */ /* 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 #include #include #include #include #include #include #include #include #include #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 */ memset(&sin, 0, sizeof(sin)); sin.sin_family = AF_INET; 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(*v4_list); for (i = 0; i < num_v4; i++) { rc = do_sns_add(fi, &v4_list[i]); if (rc < 0) { unsigned int j; /* rollback/undo to restore previous state */ for (j = 0; j < i; j++) do_sns_delete(fi, &v4_list[j]); cause = -rc; gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } } } else { cause = NS_CAUSE_INVAL_NR_IPv4_EP; gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4); break; case GPRS_SNS_EV_DELETE: 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(*v4_list); for (i = 0; i < num_v4; i++) { rc = do_sns_delete(fi, &v4_list[i]); if (rc < 0) { cause = -rc; /* continue to delete others */ } } if (cause != 0xff) { /* TODO: create list of not-deleted and return it */ gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } } else if (TLVP_PRES_LEN(tp, NS_IE_IP_ADDR, 5)) { /* delete all NS-VCs for given IP address */ const uint8_t *ie = TLVP_VAL(tp, NS_IE_IP_ADDR); struct gprs_ns_ie_ip4_elem *ip4_remote; uint32_t ip_addr = *(uint32_t *)(ie+1); if (ie[0] != 0x01) { /* Address Type != IPv4 */ cause = NS_CAUSE_UNKN_IP_ADDR; gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } /* make a copy as do_sns_delete() will change the array underneath us */ ip4_remote = talloc_memdup(fi, gss->ip4_remote, gss->num_ip4_remote*sizeof(*v4_list)); for (i = 0; i < gss->num_ip4_remote; i++) { if (ip4_remote[i].ip_addr == ip_addr) { rc = do_sns_delete(fi, &ip4_remote[i]); if (rc < 0) { cause = -rc; /* continue to delete others */ } } } talloc_free(ip4_remote); if (cause != 0xff) { /* TODO: create list of not-deleted and return it */ gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } } else { cause = NS_CAUSE_INVAL_NR_IPv4_EP; gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4); break; case GPRS_SNS_EV_CHANGE_WEIGHT: 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(*v4_list); for (i = 0; i < num_v4; i++) { rc = do_sns_change_weight(fi, &v4_list[i]); if (rc < 0) { cause = -rc; /* continue to others */ } } if (cause != 0xff) { gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } } else { cause = NS_CAUSE_INVAL_NR_IPv4_EP; gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); break; } gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4); break; } } static void gprs_sns_st_configured_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) { struct ns_signal_data nssd = {0}; osmo_signal_dispatch(SS_L_NS, S_SNS_CONFIGURED, &nssd); } static const struct osmo_fsm_state gprs_sns_bss_states[] = { [GPRS_SNS_ST_UNCONFIGURED] = { .in_event_mask = S(GPRS_SNS_EV_START), .out_state_mask = S(GPRS_SNS_ST_SIZE), .name = "UNCONFIGURED", .action = gprs_sns_st_unconfigured, }, [GPRS_SNS_ST_SIZE] = { .in_event_mask = S(GPRS_SNS_EV_SIZE_ACK), .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | S(GPRS_SNS_ST_SIZE) | S(GPRS_SNS_ST_CONFIG_BSS), .name = "SIZE", .action = gprs_sns_st_size, .onenter = gprs_sns_st_size_onenter, }, [GPRS_SNS_ST_CONFIG_BSS] = { .in_event_mask = S(GPRS_SNS_EV_CONFIG_ACK), .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | S(GPRS_SNS_ST_CONFIG_BSS) | S(GPRS_SNS_ST_CONFIG_SGSN), .name = "CONFIG_BSS", .action = gprs_sns_st_config_bss, .onenter = gprs_sns_st_config_bss_onenter, }, [GPRS_SNS_ST_CONFIG_SGSN] = { .in_event_mask = S(GPRS_SNS_EV_CONFIG) | S(GPRS_SNS_EV_CONFIG_END), .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | S(GPRS_SNS_ST_CONFIG_SGSN) | S(GPRS_SNS_ST_CONFIGURED), .name = "CONFIG_SGSN", .action = gprs_sns_st_config_sgsn, }, [GPRS_SNS_ST_CONFIGURED] = { .in_event_mask = S(GPRS_SNS_EV_ADD) | S(GPRS_SNS_EV_DELETE) | S(GPRS_SNS_EV_CHANGE_WEIGHT), .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED), .name = "CONFIGURED", .action = gprs_sns_st_configured, .onenter = gprs_sns_st_configured_onenter, }, }; static int gprs_sns_fsm_bss_timer_cb(struct osmo_fsm_inst *fi) { struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); switch (fi->T) { case 1: osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1); break; case 2: osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS, nsi->timeout[NS_TOUT_TSNS_PROV], 2); break; } return 0; } static struct osmo_fsm gprs_sns_bss_fsm = { .name = "GPRS-SNS-BSS", .states = gprs_sns_bss_states, .num_states = ARRAY_SIZE(gprs_sns_bss_states), .allstate_event_mask = 0, .allstate_action = NULL, .cleanup = NULL, .timer_cb = gprs_sns_fsm_bss_timer_cb, /* .log_subsys = DNS, "is not constant" */ .event_names = gprs_sns_event_names, .pre_term = NULL, }; struct osmo_fsm_inst *gprs_sns_bss_fsm_alloc(void *ctx, struct gprs_nsvc *nsvc, const char *id) { struct osmo_fsm_inst *fi; struct gprs_sns_state *gss; struct gprs_ns_ie_ip4_elem *ip4; struct gprs_ns_inst *nsi = nsvc->nsi; fi = osmo_fsm_inst_alloc(&gprs_sns_bss_fsm, ctx, NULL, LOGL_DEBUG, id); if (!fi) return fi; gss = talloc_zero(fi, struct gprs_sns_state); if (!gss) goto err; fi->priv = gss; gss->nsi = nsi; /* FIXME: we shouldn't use 'nsvc' here but only gprs_ns_inst */ gss->nsvc_hack = nsvc; gss->next_nsvci = 65533; /* 65534 + 65535 are already used internally */ /* create IPv4 list from the one IP/port the NS instance has */ ip4 = talloc_zero(gss, struct gprs_ns_ie_ip4_elem); if (!ip4) goto err; if (nsi->nsip.local_ip) ip4->ip_addr = htonl(nsi->nsip.local_ip); else { /* unspecified local address. Figure out which address the kernel would use if we * wanted to send a packet to the remote_ip */ char local_ip[32]; struct sockaddr_in *daddr = &nsvc->ip.bts_addr; osmo_sock_local_ip(local_ip, inet_ntoa(daddr->sin_addr)); ip4->ip_addr = inet_addr(local_ip); } ip4->udp_port = htons(gss->nsi->nsip.local_port); ip4->sig_weight = 2; ip4->data_weight = 1; gss->ip4_local = ip4; gss->num_ip4_local = 1; gss->num_max_nsvcs = 8; gss->num_max_ip4_remote = 4; return fi; err: osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL); return NULL; } int gprs_sns_bss_fsm_start(struct gprs_ns_inst *nsi) { return osmo_fsm_inst_dispatch(nsi->bss_sns_fi, GPRS_SNS_EV_START, NULL); } /* main entry point for receiving SNS messages from the network */ int gprs_ns_rx_sns(struct gprs_ns_inst *nsi, struct msgb *msg, struct tlv_parsed *tp) { struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; uint16_t nsei = msgb_nsei(msg); struct osmo_fsm_inst *fi; LOGP(DNS, LOGL_DEBUG, "NSEI=%u Rx SNS PDU type %s\n", nsei, get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); /* FIXME: how to resolve SNS FSM Instance by NSEI (SGSN)? */ fi = nsi->bss_sns_fi; switch (nsh->pdu_type) { case SNS_PDUT_SIZE: osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE, tp); break; case SNS_PDUT_SIZE_ACK: osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE_ACK, tp); break; case SNS_PDUT_CONFIG: if (nsh->data[0] & 0x01) osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_END, tp); else osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG, tp); break; case SNS_PDUT_CONFIG_ACK: osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_ACK, tp); break; case SNS_PDUT_ADD: osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_ADD, tp); break; case SNS_PDUT_DELETE: osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_DELETE, tp); break; case SNS_PDUT_CHANGE_WEIGHT: osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CHANGE_WEIGHT, tp); break; case SNS_PDUT_ACK: LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx unsupported SNS PDU type %s\n", nsei, get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); break; default: LOGP(DNS, LOGL_ERROR, "NSEI=%u Rx unknown SNS PDU type %s\n", nsei, get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); return -EINVAL; } return 0; } int gprs_sns_init(void) { /* "DNS" is not a constant/#define, but an integer variable set by the client app */ gprs_sns_bss_fsm.log_subsys = DNS; return osmo_fsm_register(&gprs_sns_bss_fsm); } #include #include static void vty_dump_sns_ip4(struct vty *vty, const struct gprs_ns_ie_ip4_elem *ip4) { struct in_addr in = { .s_addr = ip4->ip_addr }; vty_out(vty, " %s:%u, Signalling Weight: %u, Data Weight: %u%s", inet_ntoa(in), ntohs(ip4->udp_port), ip4->sig_weight, ip4->data_weight, VTY_NEWLINE); } void gprs_sns_dump_vty(struct vty *vty, const struct gprs_ns_inst *nsi, bool stats) { struct gprs_sns_state *gss; unsigned int i; if (!nsi->bss_sns_fi) return; vty_out_fsm_inst(vty, nsi->bss_sns_fi); gss = (struct gprs_sns_state *) nsi->bss_sns_fi->priv; vty_out(vty, "Maximum number of remote NS-VCs: %zu, IPv4 Endpoints: %zu%s", gss->num_max_nsvcs, gss->num_max_ip4_remote, VTY_NEWLINE); vty_out(vty, "Local IPv4 Endpoints:%s", VTY_NEWLINE); for (i = 0; i < gss->num_ip4_local; i++) vty_dump_sns_ip4(vty, &gss->ip4_local[i]); vty_out(vty, "Remote IPv4 Endpoints:%s", VTY_NEWLINE); for (i = 0; i < gss->num_ip4_remote; i++) vty_dump_sns_ip4(vty, &gss->ip4_remote[i]); }