Harald Welte | 047f387 | 2018-07-01 21:04:45 +0200 | [diff] [blame] | 1 | /* Implementation of 3GPP TS 48.016 NS IP Sub-Network Service */ |
| 2 | /* (C) 2018 by Harald Welte <laforge@gnumonks.org> */ |
| 3 | |
| 4 | /* The BSS NSE only has one SGSN IP address configured, and it will use the SNS procedures |
| 5 | * to communicated its local IPs/ports as well as all the SGSN side IPs/ports and |
| 6 | * associated weights. In theory, the BSS then uses this to establish a full mesh |
| 7 | * of NSVCs between all BSS-side IPs/ports and SGSN-side IPs/ports */ |
| 8 | |
| 9 | #include <errno.h> |
| 10 | |
| 11 | #include <netinet/in.h> |
| 12 | #include <arpa/inet.h> |
| 13 | |
| 14 | #include <osmocom/core/fsm.h> |
| 15 | #include <osmocom/core/msgb.h> |
| 16 | #include <osmocom/core/signal.h> |
| 17 | #include <osmocom/core/socket.h> |
| 18 | #include <osmocom/gsm/tlv.h> |
| 19 | #include <osmocom/gprs/gprs_msgb.h> |
| 20 | #include <osmocom/gprs/gprs_ns.h> |
| 21 | |
| 22 | #include "common_vty.h" |
| 23 | #include "gb_internal.h" |
| 24 | |
| 25 | #define S(x) (1 << (x)) |
| 26 | |
| 27 | struct gprs_sns_state { |
| 28 | struct gprs_ns_inst *nsi; |
| 29 | struct gprs_nsvc *nsvc_hack; |
| 30 | |
| 31 | /* local configuration to send to the remote end */ |
| 32 | struct gprs_ns_ie_ip4_elem *ip4_local; |
| 33 | size_t num_ip4_local; |
| 34 | |
| 35 | /* local configuration about our capabilities in terms of connections to |
| 36 | * remote (SGSN) side */ |
| 37 | size_t num_max_nsvcs; |
| 38 | size_t num_max_ip4_remote; |
| 39 | |
| 40 | /* remote configuration as received */ |
| 41 | struct gprs_ns_ie_ip4_elem *ip4_remote; |
| 42 | unsigned int num_ip4_remote; |
| 43 | |
| 44 | /* IP-SNS based Gb doesn't have a NSVCI. However, our existing Gb stack |
| 45 | * requires a unique NSVCI per NS-VC. Let's simply allocate them dynamically from |
| 46 | * the maximum (65533), counting downwards */ |
| 47 | uint16_t next_nsvci; |
| 48 | }; |
| 49 | |
| 50 | static inline struct gprs_ns_inst *ns_inst_from_fi(struct osmo_fsm_inst *fi) |
| 51 | { |
| 52 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 53 | return gss->nsi; |
| 54 | } |
| 55 | |
| 56 | /* helper function to compute the sum of all (data or signaling) weights */ |
| 57 | static int ip4_weight_sum(const struct gprs_ns_ie_ip4_elem *ip4, unsigned int num, |
| 58 | bool data_weight) |
| 59 | { |
| 60 | unsigned int i; |
| 61 | int weight_sum = 0; |
| 62 | |
| 63 | for (i = 0; i < num; i++) { |
| 64 | if (data_weight) |
| 65 | weight_sum += ip4[i].data_weight; |
| 66 | else |
| 67 | weight_sum += ip4[i].sig_weight; |
| 68 | } |
| 69 | return weight_sum; |
| 70 | } |
| 71 | #define ip4_weight_sum_data(x,y) ip4_weight_sum(x, y, true) |
| 72 | #define ip4_weight_sum_sig(x,y) ip4_weight_sum(x, y, false) |
| 73 | |
| 74 | static struct gprs_nsvc *nsvc_by_ip4_elem(struct gprs_ns_inst *nsi, |
| 75 | const struct gprs_ns_ie_ip4_elem *ip4) |
| 76 | { |
| 77 | struct sockaddr_in sin; |
| 78 | /* copy over. Both data structures use network byte order */ |
| 79 | sin.sin_addr.s_addr = ip4->ip_addr; |
| 80 | sin.sin_port = ip4->udp_port; |
| 81 | return gprs_nsvc_by_rem_addr(nsi, &sin); |
| 82 | } |
| 83 | |
| 84 | static struct gprs_nsvc *gprs_nsvc_create_ip4(struct gprs_ns_inst *nsi, |
| 85 | const struct gprs_ns_ie_ip4_elem *ip4) |
| 86 | { |
| 87 | struct gprs_sns_state *gss = (struct gprs_sns_state *) nsi->bss_sns_fi->priv; |
| 88 | struct gprs_nsvc *nsvc; |
| 89 | struct sockaddr_in sin; |
| 90 | /* copy over. Both data structures use network byte order */ |
Harald Welte | fa90cfd | 2019-03-20 08:30:29 +0100 | [diff] [blame] | 91 | memset(&sin, 0, sizeof(sin)); |
| 92 | sin.sin_family = AF_INET; |
Harald Welte | 047f387 | 2018-07-01 21:04:45 +0200 | [diff] [blame] | 93 | sin.sin_addr.s_addr = ip4->ip_addr; |
| 94 | sin.sin_port = ip4->udp_port; |
| 95 | |
| 96 | nsvc = gprs_nsvc_create2(nsi, gss->next_nsvci--, ip4->sig_weight, ip4->data_weight); |
| 97 | if (!nsvc) |
| 98 | return NULL; |
| 99 | |
| 100 | /* NSEI is the same across all NS-VCs */ |
| 101 | nsvc->nsei = gss->nsvc_hack->nsei; |
| 102 | nsvc->nsvci_is_valid = 0; |
| 103 | nsvc->ip.bts_addr = sin; |
| 104 | |
| 105 | return nsvc; |
| 106 | } |
| 107 | |
| 108 | static int create_missing_nsvcs(struct osmo_fsm_inst *fi) |
| 109 | { |
| 110 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 111 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 112 | unsigned int i; |
| 113 | |
| 114 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 115 | const struct gprs_ns_ie_ip4_elem *ip4 = &gss->ip4_remote[i]; |
| 116 | struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4); |
| 117 | if (!nsvc) { |
| 118 | /* create, if it doesn't exist */ |
| 119 | nsvc = gprs_nsvc_create_ip4(nsi, ip4); |
| 120 | if (!nsvc) { |
| 121 | LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG: Failed to create NSVC\n"); |
| 122 | continue; |
| 123 | } |
| 124 | } else { |
| 125 | /* update data / signalling weight */ |
| 126 | nsvc->data_weight = ip4->data_weight; |
| 127 | nsvc->sig_weight = ip4->sig_weight; |
| 128 | } |
| 129 | LOGPFSML(fi, LOGL_INFO, "NS-VC %s data_weight=%u, sig_weight=%u\n", |
| 130 | gprs_ns_ll_str(nsvc), nsvc->data_weight, nsvc->sig_weight); |
| 131 | } |
| 132 | |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | /* Add a given remote IPv4 element to gprs_sns_state */ |
| 137 | static int add_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) |
| 138 | { |
| 139 | if (gss->num_ip4_remote >= gss->num_max_ip4_remote) |
| 140 | return -E2BIG; |
| 141 | |
| 142 | gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote, struct gprs_ns_ie_ip4_elem, |
| 143 | gss->num_ip4_remote+1); |
| 144 | gss->ip4_remote[gss->num_ip4_remote] = *ip4; |
| 145 | gss->num_ip4_remote += 1; |
| 146 | return 0; |
| 147 | } |
| 148 | |
| 149 | /* Remove a given remote IPv4 element from gprs_sns_state */ |
| 150 | static int remove_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) |
| 151 | { |
| 152 | unsigned int i; |
| 153 | |
| 154 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 155 | if (memcmp(&gss->ip4_remote[i], ip4, sizeof(*ip4))) |
| 156 | continue; |
| 157 | /* all array elements < i remain as they are; all > i are shifted left by one */ |
| 158 | memmove(&gss->ip4_remote[i], &gss->ip4_remote[i+1], gss->num_ip4_remote-i-1); |
| 159 | gss->num_ip4_remote -= 1; |
| 160 | return 0; |
| 161 | } |
| 162 | return -1; |
| 163 | } |
| 164 | |
| 165 | /* update the weights for specified remote IPv4 */ |
| 166 | static int update_remote_ip4_elem(struct gprs_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) |
| 167 | { |
| 168 | unsigned int i; |
| 169 | |
| 170 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 171 | if (gss->ip4_remote[i].ip_addr != ip4->ip_addr || |
| 172 | gss->ip4_remote[i].udp_port != ip4->udp_port) |
| 173 | continue; |
| 174 | gss->ip4_remote[i].sig_weight = ip4->sig_weight; |
| 175 | gss->ip4_remote[i].data_weight = ip4->data_weight; |
| 176 | return 0; |
| 177 | } |
| 178 | return -1; |
| 179 | } |
| 180 | |
| 181 | |
| 182 | static int do_sns_change_weight(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4) |
| 183 | { |
| 184 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 185 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 186 | struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4); |
| 187 | |
| 188 | /* TODO: Upon receiving an SNS-CHANGEWEIGHT PDU, if the resulting sum of the |
| 189 | * signalling weights of all the peer IP endpoints configured for this NSE is |
| 190 | * equal to zero or if the resulting sum of the data weights of all the peer IP |
| 191 | * endpoints configured for this NSE is equal to zero, the BSS/SGSN shall send an |
| 192 | * SNS-ACK PDU with a cause code of "Invalid weights". */ |
| 193 | |
| 194 | update_remote_ip4_elem(gss, ip4); |
| 195 | |
| 196 | if (!nsvc) { |
| 197 | LOGPFSML(fi, LOGL_NOTICE, "Couldn't find NS-VC for SNS-CHANGE_WEIGHT\n"); |
| 198 | return -NS_CAUSE_NSVC_UNKNOWN; |
| 199 | } |
| 200 | |
| 201 | LOGPFSML(fi, LOGL_INFO, "CHANGE-WEIGHT NS-VC %s data_weight %u->%u, sig_weight %u->%u\n", |
| 202 | gprs_ns_ll_str(nsvc), nsvc->data_weight, ip4->data_weight, |
| 203 | nsvc->sig_weight, ip4->sig_weight); |
| 204 | |
| 205 | nsvc->data_weight = ip4->data_weight; |
| 206 | nsvc->sig_weight = ip4->sig_weight; |
| 207 | |
| 208 | return 0; |
| 209 | } |
| 210 | |
| 211 | static int do_sns_delete(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4) |
| 212 | { |
| 213 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 214 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 215 | struct gprs_nsvc *nsvc = nsvc_by_ip4_elem(nsi, ip4); |
| 216 | |
| 217 | if (remove_remote_ip4_elem(gss, ip4) < 0) |
| 218 | return -NS_CAUSE_UNKN_IP_EP; |
| 219 | |
| 220 | if (!nsvc) { |
| 221 | LOGPFSML(fi, LOGL_NOTICE, "Couldn't find NS-VC for SNS-DELETE\n"); |
| 222 | return -NS_CAUSE_NSVC_UNKNOWN; |
| 223 | } |
| 224 | LOGPFSML(fi, LOGL_INFO, "DELETE NS-VC %s\n", gprs_ns_ll_str(nsvc)); |
| 225 | gprs_nsvc_delete(nsvc); |
| 226 | |
| 227 | return 0; |
| 228 | } |
| 229 | |
| 230 | static int do_sns_add(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4) |
| 231 | { |
| 232 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 233 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 234 | struct gprs_nsvc *nsvc; |
| 235 | |
| 236 | /* Upon receiving an SNS-ADD PDU, if the consequent number of IPv4 endpoints |
| 237 | * exceeds the number of IPv4 endpoints supported by the NSE, the NSE shall send |
| 238 | * an SNS-ACK PDU with a cause code set to "Invalid number of IP4 Endpoints". */ |
| 239 | if (add_remote_ip4_elem(gss, ip4) < 0) |
| 240 | return -NS_CAUSE_INVAL_NR_NS_VC; |
| 241 | |
| 242 | /* Upon receiving an SNS-ADD PDU containing an already configured IP endpoint the |
| 243 | * NSE shall send an SNS-ACK PDU with the cause code "Protocol error - |
| 244 | * unspecified" */ |
| 245 | nsvc = nsvc_by_ip4_elem(nsi, ip4); |
| 246 | if (nsvc) |
| 247 | return -NS_CAUSE_PROTO_ERR_UNSPEC; |
| 248 | |
| 249 | nsvc = gprs_nsvc_create_ip4(nsi, ip4); |
| 250 | if (!nsvc) { |
| 251 | LOGPFSML(fi, LOGL_ERROR, "SNS-ADD: Failed to create NSVC\n"); |
| 252 | remove_remote_ip4_elem(gss, ip4); |
| 253 | return -NS_CAUSE_EQUIP_FAIL; |
| 254 | } |
| 255 | LOGPFSML(fi, LOGL_INFO, "ADD NS-VC %s data_weight=%u, sig_weight=%u\n", |
| 256 | gprs_ns_ll_str(nsvc), nsvc->data_weight, nsvc->sig_weight); |
| 257 | /* Start the test procedure for this new NS-VC */ |
| 258 | gprs_nsvc_start_test(nsvc); |
| 259 | return 0; |
| 260 | } |
| 261 | |
| 262 | |
| 263 | |
| 264 | /*********************************************************************** |
| 265 | * BSS-side FSM for IP Sub-Network Service |
| 266 | ***********************************************************************/ |
| 267 | |
| 268 | enum gprs_sns_bss_state { |
| 269 | GPRS_SNS_ST_UNCONFIGURED, |
| 270 | GPRS_SNS_ST_SIZE, /*!< SNS-SIZE procedure ongoing */ |
| 271 | GPRS_SNS_ST_CONFIG_BSS, /*!< SNS-CONFIG procedure (BSS->SGSN) ongoing */ |
| 272 | GPRS_SNS_ST_CONFIG_SGSN, /*!< SNS-CONFIG procedure (SGSN->BSS) ongoing */ |
| 273 | GPRS_SNS_ST_CONFIGURED, |
| 274 | }; |
| 275 | |
| 276 | enum gprs_sns_event { |
| 277 | GPRS_SNS_EV_START, |
| 278 | GPRS_SNS_EV_SIZE, |
| 279 | GPRS_SNS_EV_SIZE_ACK, |
| 280 | GPRS_SNS_EV_CONFIG, |
| 281 | GPRS_SNS_EV_CONFIG_END, /*!< SNS-CONFIG with end flag received */ |
| 282 | GPRS_SNS_EV_CONFIG_ACK, |
| 283 | GPRS_SNS_EV_ADD, |
| 284 | GPRS_SNS_EV_DELETE, |
| 285 | GPRS_SNS_EV_CHANGE_WEIGHT, |
| 286 | }; |
| 287 | |
| 288 | static const struct value_string gprs_sns_event_names[] = { |
| 289 | { GPRS_SNS_EV_START, "START" }, |
| 290 | { GPRS_SNS_EV_SIZE, "SIZE" }, |
| 291 | { GPRS_SNS_EV_SIZE_ACK, "SIZE_ACK" }, |
| 292 | { GPRS_SNS_EV_CONFIG, "CONFIG" }, |
| 293 | { GPRS_SNS_EV_CONFIG_END, "CONFIG_END" }, |
| 294 | { GPRS_SNS_EV_CONFIG_ACK, "CONFIG_ACK" }, |
| 295 | { GPRS_SNS_EV_ADD, "ADD" }, |
| 296 | { GPRS_SNS_EV_DELETE, "DELETE" }, |
| 297 | { GPRS_SNS_EV_CHANGE_WEIGHT, "CHANGE_WEIGHT" }, |
| 298 | { 0, NULL } |
| 299 | }; |
| 300 | |
| 301 | static void gprs_sns_st_unconfigured(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 302 | { |
| 303 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 304 | switch (event) { |
| 305 | case GPRS_SNS_EV_START: |
| 306 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1); |
| 307 | break; |
| 308 | default: |
| 309 | OSMO_ASSERT(0); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | static void gprs_sns_st_size(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 314 | { |
| 315 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 316 | struct tlv_parsed *tp = NULL; |
| 317 | |
| 318 | switch (event) { |
| 319 | case GPRS_SNS_EV_SIZE_ACK: |
| 320 | tp = data; |
| 321 | if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { |
| 322 | LOGPFSML(fi, LOGL_ERROR, "SNS-SIZE-ACK with cause %s\n", |
| 323 | gprs_ns_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); |
| 324 | /* FIXME: What to do? */ |
| 325 | } else { |
| 326 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS, |
| 327 | nsi->timeout[NS_TOUT_TSNS_PROV], 2); |
| 328 | } |
| 329 | break; |
| 330 | default: |
| 331 | OSMO_ASSERT(0); |
| 332 | } |
| 333 | } |
| 334 | static void gprs_sns_st_size_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| 335 | { |
| 336 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 337 | uint16_t num_max_ip4_remote = gss->num_max_ip4_remote; |
| 338 | |
| 339 | gprs_ns_tx_sns_size(gss->nsvc_hack, true, gss->num_max_nsvcs, &num_max_ip4_remote, NULL); |
| 340 | } |
| 341 | |
| 342 | |
| 343 | static void gprs_sns_st_config_bss(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 344 | { |
| 345 | //struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 346 | //struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 347 | struct tlv_parsed *tp = NULL; |
| 348 | |
| 349 | switch (event) { |
| 350 | case GPRS_SNS_EV_CONFIG_ACK: |
| 351 | tp = data; |
| 352 | if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { |
| 353 | LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG-ACK with cause %s\n", |
| 354 | gprs_ns_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); |
| 355 | /* FIXME: What to do? */ |
| 356 | } else { |
| 357 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_SGSN, 0, 0); |
| 358 | } |
| 359 | break; |
| 360 | default: |
| 361 | OSMO_ASSERT(0); |
| 362 | } |
| 363 | } |
| 364 | static void gprs_sns_st_config_bss_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| 365 | { |
| 366 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 367 | /* Transmit SNS-CONFIG */ |
| 368 | gprs_ns_tx_sns_config(gss->nsvc_hack, true, gss->ip4_local, gss->num_ip4_local); |
| 369 | } |
| 370 | |
| 371 | static void gprs_sns_st_config_sgsn(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 372 | { |
| 373 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 374 | struct tlv_parsed *tp = NULL; |
| 375 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 376 | const struct gprs_ns_ie_ip4_elem *v4_list; |
| 377 | unsigned int num_v4; |
| 378 | uint8_t cause; |
| 379 | |
| 380 | switch (event) { |
| 381 | case GPRS_SNS_EV_CONFIG_END: |
| 382 | case GPRS_SNS_EV_CONFIG: |
| 383 | tp = data; |
| 384 | #if 0 /* part of incoming SNS-SIZE (doesn't happen on BSS side */ |
| 385 | if (TLVP_PRESENT(tp, NS_IE_RESET_FLAG)) { |
| 386 | /* reset all existing config */ |
| 387 | if (gss->ip4_remote) |
| 388 | talloc_free(gss->ip4_remote); |
| 389 | gss->num_ip4_remote = 0; |
| 390 | } |
| 391 | #endif |
| 392 | if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 393 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 394 | gprs_ns_tx_sns_config_ack(gss->nsvc_hack, &cause); |
| 395 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| 396 | break; |
| 397 | } |
| 398 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 399 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
| 400 | /* realloc to the new size */ |
| 401 | gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote, |
| 402 | struct gprs_ns_ie_ip4_elem, |
| 403 | gss->num_ip4_remote+num_v4); |
| 404 | /* append the new entries to the end of the list */ |
| 405 | memcpy(&gss->ip4_remote[gss->num_ip4_remote], v4_list, num_v4*sizeof(*v4_list)); |
| 406 | gss->num_ip4_remote += num_v4; |
| 407 | |
| 408 | LOGPFSML(fi, LOGL_INFO, "Rx SNS-CONFIG: Remote IPv4 list now %u entries\n", |
| 409 | gss->num_ip4_remote); |
| 410 | if (event == GPRS_SNS_EV_CONFIG_END) { |
| 411 | /* check if sum of data / sig weights == 0 */ |
| 412 | if (ip4_weight_sum_data(gss->ip4_remote, gss->num_ip4_remote) == 0 || |
| 413 | ip4_weight_sum_sig(gss->ip4_remote, gss->num_ip4_remote) == 0) { |
| 414 | cause = NS_CAUSE_INVAL_WEIGH; |
| 415 | gprs_ns_tx_sns_config_ack(gss->nsvc_hack, &cause); |
| 416 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| 417 | break; |
| 418 | } |
| 419 | create_missing_nsvcs(fi); |
| 420 | gprs_ns_tx_sns_config_ack(gss->nsvc_hack, NULL); |
| 421 | /* start the test procedure on ALL NSVCs! */ |
| 422 | gprs_start_alive_all_nsvcs(nsi); |
| 423 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, 0, 0); |
| 424 | } else { |
| 425 | /* just send CONFIG-ACK */ |
| 426 | gprs_ns_tx_sns_config_ack(gss->nsvc_hack, NULL); |
| 427 | } |
| 428 | break; |
| 429 | default: |
| 430 | OSMO_ASSERT(0); |
| 431 | } |
| 432 | } |
| 433 | |
| 434 | static void gprs_sns_st_configured(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 435 | { |
| 436 | struct gprs_sns_state *gss = (struct gprs_sns_state *) fi->priv; |
| 437 | struct tlv_parsed *tp = NULL; |
| 438 | const struct gprs_ns_ie_ip4_elem *v4_list = NULL; |
| 439 | unsigned int num_v4 = 0; |
| 440 | uint8_t trans_id; |
| 441 | uint8_t cause = 0xff; |
| 442 | unsigned int i; |
| 443 | int rc; |
| 444 | |
| 445 | switch (event) { |
| 446 | case GPRS_SNS_EV_ADD: |
| 447 | tp = data; |
| 448 | trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| 449 | if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 450 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 451 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
| 452 | for (i = 0; i < num_v4; i++) { |
| 453 | rc = do_sns_add(fi, &v4_list[i]); |
| 454 | if (rc < 0) { |
| 455 | unsigned int j; |
| 456 | /* rollback/undo to restore previous state */ |
| 457 | for (j = 0; j < i; j++) |
| 458 | do_sns_delete(fi, &v4_list[j]); |
| 459 | cause = -rc; |
| 460 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 461 | break; |
| 462 | } |
| 463 | } |
| 464 | } else { |
| 465 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 466 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 467 | break; |
| 468 | } |
| 469 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4); |
| 470 | break; |
| 471 | case GPRS_SNS_EV_DELETE: |
| 472 | tp = data; |
| 473 | trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| 474 | if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 475 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 476 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
| 477 | for (i = 0; i < num_v4; i++) { |
| 478 | rc = do_sns_delete(fi, &v4_list[i]); |
| 479 | if (rc < 0) { |
| 480 | cause = -rc; |
| 481 | /* continue to delete others */ |
| 482 | } |
| 483 | } |
| 484 | if (cause != 0xff) { |
| 485 | /* TODO: create list of not-deleted and return it */ |
| 486 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 487 | break; |
| 488 | } |
| 489 | } else if (TLVP_PRES_LEN(tp, NS_IE_IP_ADDR, 5)) { |
| 490 | /* delete all NS-VCs for given IP address */ |
| 491 | const uint8_t *ie = TLVP_VAL(tp, NS_IE_IP_ADDR); |
| 492 | struct gprs_ns_ie_ip4_elem *ip4_remote; |
| 493 | uint32_t ip_addr = *(uint32_t *)(ie+1); |
| 494 | if (ie[0] != 0x01) { /* Address Type != IPv4 */ |
| 495 | cause = NS_CAUSE_UNKN_IP_ADDR; |
| 496 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 497 | break; |
| 498 | } |
| 499 | /* make a copy as do_sns_delete() will change the array underneath us */ |
| 500 | ip4_remote = talloc_memdup(fi, gss->ip4_remote, |
| 501 | gss->num_ip4_remote*sizeof(v4_list)); |
| 502 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 503 | if (ip4_remote[i].ip_addr == ip_addr) { |
| 504 | rc = do_sns_delete(fi, &ip4_remote[i]); |
| 505 | if (rc < 0) { |
| 506 | cause = -rc; |
| 507 | /* continue to delete others */ |
| 508 | } |
| 509 | } |
| 510 | } |
| 511 | talloc_free(ip4_remote); |
| 512 | if (cause != 0xff) { |
| 513 | /* TODO: create list of not-deleted and return it */ |
| 514 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 515 | break; |
| 516 | } |
| 517 | } else { |
| 518 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 519 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 520 | break; |
| 521 | } |
| 522 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4); |
| 523 | break; |
| 524 | case GPRS_SNS_EV_CHANGE_WEIGHT: |
| 525 | tp = data; |
| 526 | trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| 527 | if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 528 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 529 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
| 530 | for (i = 0; i < num_v4; i++) { |
| 531 | rc = do_sns_change_weight(fi, &v4_list[i]); |
| 532 | if (rc < 0) { |
| 533 | cause = -rc; |
| 534 | /* continue to others */ |
| 535 | } |
| 536 | } |
| 537 | if (cause != 0xff) { |
| 538 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 539 | break; |
| 540 | } |
| 541 | } else { |
| 542 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 543 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, &cause, NULL, 0); |
| 544 | break; |
| 545 | } |
| 546 | gprs_ns_tx_sns_ack(gss->nsvc_hack, trans_id, NULL, v4_list, num_v4); |
| 547 | break; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | static void gprs_sns_st_configured_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| 552 | { |
| 553 | struct ns_signal_data nssd = {0}; |
| 554 | osmo_signal_dispatch(SS_L_NS, S_SNS_CONFIGURED, &nssd); |
| 555 | } |
| 556 | |
| 557 | static const struct osmo_fsm_state gprs_sns_bss_states[] = { |
| 558 | [GPRS_SNS_ST_UNCONFIGURED] = { |
| 559 | .in_event_mask = S(GPRS_SNS_EV_START), |
| 560 | .out_state_mask = S(GPRS_SNS_ST_SIZE), |
| 561 | .name = "UNCONFIGURED", |
| 562 | .action = gprs_sns_st_unconfigured, |
| 563 | }, |
| 564 | [GPRS_SNS_ST_SIZE] = { |
| 565 | .in_event_mask = S(GPRS_SNS_EV_SIZE_ACK), |
| 566 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| 567 | S(GPRS_SNS_ST_SIZE) | |
| 568 | S(GPRS_SNS_ST_CONFIG_BSS), |
| 569 | .name = "SIZE", |
| 570 | .action = gprs_sns_st_size, |
| 571 | .onenter = gprs_sns_st_size_onenter, |
| 572 | }, |
| 573 | [GPRS_SNS_ST_CONFIG_BSS] = { |
| 574 | .in_event_mask = S(GPRS_SNS_EV_CONFIG_ACK), |
| 575 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| 576 | S(GPRS_SNS_ST_CONFIG_BSS) | |
| 577 | S(GPRS_SNS_ST_CONFIG_SGSN), |
| 578 | .name = "CONFIG_BSS", |
| 579 | .action = gprs_sns_st_config_bss, |
| 580 | .onenter = gprs_sns_st_config_bss_onenter, |
| 581 | }, |
| 582 | [GPRS_SNS_ST_CONFIG_SGSN] = { |
| 583 | .in_event_mask = S(GPRS_SNS_EV_CONFIG) | |
| 584 | S(GPRS_SNS_EV_CONFIG_END), |
| 585 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| 586 | S(GPRS_SNS_ST_CONFIG_SGSN) | |
| 587 | S(GPRS_SNS_ST_CONFIGURED), |
| 588 | .name = "CONFIG_SGSN", |
| 589 | .action = gprs_sns_st_config_sgsn, |
| 590 | }, |
| 591 | [GPRS_SNS_ST_CONFIGURED] = { |
| 592 | .in_event_mask = S(GPRS_SNS_EV_ADD) | |
| 593 | S(GPRS_SNS_EV_DELETE) | |
| 594 | S(GPRS_SNS_EV_CHANGE_WEIGHT), |
| 595 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED), |
| 596 | .name = "CONFIGURED", |
| 597 | .action = gprs_sns_st_configured, |
| 598 | .onenter = gprs_sns_st_configured_onenter, |
| 599 | }, |
| 600 | }; |
| 601 | |
| 602 | static int gprs_sns_fsm_bss_timer_cb(struct osmo_fsm_inst *fi) |
| 603 | { |
| 604 | struct gprs_ns_inst *nsi = ns_inst_from_fi(fi); |
| 605 | |
| 606 | switch (fi->T) { |
| 607 | case 1: |
| 608 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1); |
| 609 | break; |
| 610 | case 2: |
| 611 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS, nsi->timeout[NS_TOUT_TSNS_PROV], 2); |
| 612 | break; |
| 613 | } |
| 614 | return 0; |
| 615 | } |
| 616 | |
| 617 | static struct osmo_fsm gprs_sns_bss_fsm = { |
| 618 | .name = "GPRS-SNS-BSS", |
| 619 | .states = gprs_sns_bss_states, |
| 620 | .num_states = ARRAY_SIZE(gprs_sns_bss_states), |
| 621 | .allstate_event_mask = 0, |
| 622 | .allstate_action = NULL, |
| 623 | .cleanup = NULL, |
| 624 | .timer_cb = gprs_sns_fsm_bss_timer_cb, |
| 625 | /* .log_subsys = DNS, "is not constant" */ |
| 626 | .event_names = gprs_sns_event_names, |
| 627 | .pre_term = NULL, |
| 628 | }; |
| 629 | |
| 630 | struct osmo_fsm_inst *gprs_sns_bss_fsm_alloc(void *ctx, struct gprs_nsvc *nsvc, |
| 631 | const char *id) |
| 632 | { |
| 633 | struct osmo_fsm_inst *fi; |
| 634 | struct gprs_sns_state *gss; |
| 635 | struct gprs_ns_ie_ip4_elem *ip4; |
| 636 | struct gprs_ns_inst *nsi = nsvc->nsi; |
| 637 | |
| 638 | fi = osmo_fsm_inst_alloc(&gprs_sns_bss_fsm, ctx, NULL, LOGL_DEBUG, id); |
| 639 | if (!fi) |
| 640 | return fi; |
| 641 | |
| 642 | gss = talloc_zero(fi, struct gprs_sns_state); |
| 643 | if (!gss) |
| 644 | goto err; |
| 645 | |
| 646 | fi->priv = gss; |
| 647 | gss->nsi = nsi; |
| 648 | /* FIXME: we shouldn't use 'nsvc' here but only gprs_ns_inst */ |
| 649 | gss->nsvc_hack = nsvc; |
| 650 | gss->next_nsvci = 65533; /* 65534 + 65535 are already used internally */ |
| 651 | |
| 652 | /* create IPv4 list from the one IP/port the NS instance has */ |
| 653 | ip4 = talloc_zero(gss, struct gprs_ns_ie_ip4_elem); |
| 654 | if (!ip4) |
| 655 | goto err; |
| 656 | if (nsi->nsip.local_ip) |
| 657 | ip4->ip_addr = htonl(nsi->nsip.local_ip); |
| 658 | else { |
| 659 | /* unspecified local address. Figure out which address the kernel would use if we |
| 660 | * wanted to send a packet to the remote_ip */ |
| 661 | char local_ip[32]; |
Harald Welte | 24e67f8 | 2019-03-16 18:06:22 +0100 | [diff] [blame] | 662 | struct sockaddr_in *daddr = &nsvc->ip.bts_addr; |
| 663 | osmo_sock_local_ip(local_ip, inet_ntoa(daddr->sin_addr)); |
Harald Welte | 047f387 | 2018-07-01 21:04:45 +0200 | [diff] [blame] | 664 | ip4->ip_addr = inet_addr(local_ip); |
| 665 | } |
| 666 | ip4->udp_port = htons(gss->nsi->nsip.local_port); |
| 667 | ip4->sig_weight = 2; |
| 668 | ip4->data_weight = 1; |
| 669 | gss->ip4_local = ip4; |
| 670 | gss->num_ip4_local = 1; |
| 671 | gss->num_max_nsvcs = 8; |
| 672 | gss->num_max_ip4_remote = 4; |
| 673 | |
| 674 | return fi; |
| 675 | err: |
| 676 | osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL); |
| 677 | return NULL; |
| 678 | } |
| 679 | |
| 680 | int gprs_sns_bss_fsm_start(struct gprs_ns_inst *nsi) |
| 681 | { |
| 682 | return osmo_fsm_inst_dispatch(nsi->bss_sns_fi, GPRS_SNS_EV_START, NULL); |
| 683 | } |
| 684 | |
| 685 | /* main entry point for receiving SNS messages from the network */ |
| 686 | int gprs_ns_rx_sns(struct gprs_ns_inst *nsi, struct msgb *msg, struct tlv_parsed *tp) |
| 687 | { |
| 688 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 689 | uint16_t nsei = msgb_nsei(msg); |
| 690 | struct osmo_fsm_inst *fi; |
| 691 | |
| 692 | LOGP(DNS, LOGL_DEBUG, "NSEI=%u Rx SNS PDU type %s\n", nsei, |
| 693 | get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| 694 | |
| 695 | /* FIXME: how to resolve SNS FSM Instance by NSEI (SGSN)? */ |
| 696 | fi = nsi->bss_sns_fi; |
| 697 | |
| 698 | switch (nsh->pdu_type) { |
| 699 | case SNS_PDUT_SIZE: |
| 700 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE, tp); |
| 701 | break; |
| 702 | case SNS_PDUT_SIZE_ACK: |
| 703 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE_ACK, tp); |
| 704 | break; |
| 705 | case SNS_PDUT_CONFIG: |
| 706 | if (nsh->data[0] & 0x01) |
| 707 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_END, tp); |
| 708 | else |
| 709 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG, tp); |
| 710 | break; |
| 711 | case SNS_PDUT_CONFIG_ACK: |
| 712 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_ACK, tp); |
| 713 | break; |
| 714 | case SNS_PDUT_ADD: |
| 715 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_ADD, tp); |
| 716 | break; |
| 717 | case SNS_PDUT_DELETE: |
| 718 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_DELETE, tp); |
| 719 | break; |
| 720 | case SNS_PDUT_CHANGE_WEIGHT: |
| 721 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CHANGE_WEIGHT, tp); |
| 722 | break; |
| 723 | case SNS_PDUT_ACK: |
| 724 | LOGP(DNS, LOGL_NOTICE, "NSEI=%u Rx unsupported SNS PDU type %s\n", nsei, |
| 725 | get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| 726 | break; |
| 727 | default: |
| 728 | LOGP(DNS, LOGL_ERROR, "NSEI=%u Rx unknown SNS PDU type %s\n", nsei, |
| 729 | get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| 730 | return -EINVAL; |
| 731 | } |
| 732 | |
| 733 | return 0; |
| 734 | } |
| 735 | |
| 736 | int gprs_sns_init(void) |
| 737 | { |
| 738 | /* "DNS" is not a constant/#define, but an integer variable set by the client app */ |
| 739 | gprs_sns_bss_fsm.log_subsys = DNS; |
| 740 | return osmo_fsm_register(&gprs_sns_bss_fsm); |
| 741 | } |
| 742 | |
| 743 | #include <osmocom/vty/vty.h> |
| 744 | #include <osmocom/vty/misc.h> |
| 745 | |
| 746 | static void vty_dump_sns_ip4(struct vty *vty, const struct gprs_ns_ie_ip4_elem *ip4) |
| 747 | { |
| 748 | struct in_addr in = { .s_addr = ip4->ip_addr }; |
| 749 | vty_out(vty, " %s:%u, Signalling Weight: %u, Data Weight: %u%s", |
| 750 | inet_ntoa(in), ntohs(ip4->udp_port), ip4->sig_weight, ip4->data_weight, VTY_NEWLINE); |
| 751 | } |
| 752 | |
| 753 | void gprs_sns_dump_vty(struct vty *vty, const struct gprs_ns_inst *nsi, bool stats) |
| 754 | { |
| 755 | struct gprs_sns_state *gss; |
| 756 | unsigned int i; |
| 757 | |
| 758 | if (!nsi->bss_sns_fi) |
| 759 | return; |
| 760 | |
| 761 | vty_out_fsm_inst(vty, nsi->bss_sns_fi); |
| 762 | gss = (struct gprs_sns_state *) nsi->bss_sns_fi->priv; |
| 763 | |
| 764 | vty_out(vty, "Maximum number of remote NS-VCs: %zu, IPv4 Endpoints: %zu%s", |
| 765 | gss->num_max_nsvcs, gss->num_max_ip4_remote, VTY_NEWLINE); |
| 766 | |
| 767 | vty_out(vty, "Local IPv4 Endpoints:%s", VTY_NEWLINE); |
| 768 | for (i = 0; i < gss->num_ip4_local; i++) |
| 769 | vty_dump_sns_ip4(vty, &gss->ip4_local[i]); |
| 770 | |
| 771 | vty_out(vty, "Remote IPv4 Endpoints:%s", VTY_NEWLINE); |
| 772 | for (i = 0; i < gss->num_ip4_remote; i++) |
| 773 | vty_dump_sns_ip4(vty, &gss->ip4_remote[i]); |
| 774 | } |