| /* 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 */ |
| 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 <osmocom/vty/vty.h> |
| #include <osmocom/vty/misc.h> |
| |
| 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]); |
| } |