Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1 | /*! \file gprs_ns2_sns.c |
| 2 | * NS Sub-Network Service Protocol implementation |
| 3 | * 3GPP TS 08.16 version 8.0.1 Release 1999 / ETSI TS 101 299 V8.0.1 (2002-05) |
| 4 | * as well as its successor 3GPP TS 48.016 */ |
| 5 | |
| 6 | /* (C) 2018 by Harald Welte <laforge@gnumonks.org> |
| 7 | * (C) 2020 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de> |
| 8 | * Author: Alexander Couzens <lynxis@fe80.eu> |
| 9 | * |
| 10 | * All Rights Reserved |
| 11 | * |
| 12 | * SPDX-License-Identifier: GPL-2.0+ |
| 13 | * |
| 14 | * This program is free software; you can redistribute it and/or modify |
| 15 | * it under the terms of the GNU General Public License as published by |
| 16 | * the Free Software Foundation; either version 2 of the License, or |
| 17 | * (at your option) any later version. |
| 18 | * |
| 19 | * This program is distributed in the hope that it will be useful, |
| 20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 22 | * GNU General Public License for more details. |
| 23 | * |
| 24 | * You should have received a copy of the GNU General Public License |
| 25 | * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 26 | * |
| 27 | */ |
| 28 | |
| 29 | /* The BSS NSE only has one SGSN IP address configured, and it will use the SNS procedures |
| 30 | * to communicated its local IPs/ports as well as all the SGSN side IPs/ports and |
| 31 | * associated weights. The BSS then uses this to establish a full mesh |
| 32 | * of NSVCs between all BSS-side IPs/ports and SGSN-side IPs/ports. |
| 33 | * |
| 34 | * Known limitation/expectation/bugs: |
| 35 | * - No concurrent dual stack. It supports either IPv4 or IPv6, but not both at the same time. |
| 36 | * - SNS Add/Change/Delete: Doesn't answer on the same NSVC as received SNS ADD/CHANGE/DELETE PDUs. |
| 37 | * - SNS Add/Change/Delete: Doesn't communicated the failed IPv4/IPv6 entries on the SNS_ACK. |
| 38 | */ |
| 39 | |
| 40 | #include <errno.h> |
| 41 | |
| 42 | #include <netinet/in.h> |
| 43 | #include <arpa/inet.h> |
| 44 | #include <stdint.h> |
| 45 | |
| 46 | #include <osmocom/core/fsm.h> |
| 47 | #include <osmocom/core/msgb.h> |
| 48 | #include <osmocom/core/socket.h> |
| 49 | #include <osmocom/gsm/tlv.h> |
| 50 | #include <osmocom/gprs/gprs_msgb.h> |
| 51 | #include <osmocom/gprs/gprs_ns2.h> |
| 52 | #include <osmocom/gprs/protocol/gsm_08_16.h> |
| 53 | |
| 54 | #include "gprs_ns2_internal.h" |
| 55 | |
| 56 | #define S(x) (1 << (x)) |
| 57 | |
| 58 | enum ns2_sns_type { |
| 59 | IPv4, |
| 60 | IPv6, |
| 61 | }; |
| 62 | |
| 63 | enum gprs_sns_bss_state { |
| 64 | GPRS_SNS_ST_UNCONFIGURED, |
| 65 | GPRS_SNS_ST_SIZE, /*!< SNS-SIZE procedure ongoing */ |
| 66 | GPRS_SNS_ST_CONFIG_BSS, /*!< SNS-CONFIG procedure (BSS->SGSN) ongoing */ |
| 67 | GPRS_SNS_ST_CONFIG_SGSN, /*!< SNS-CONFIG procedure (SGSN->BSS) ongoing */ |
| 68 | GPRS_SNS_ST_CONFIGURED, |
| 69 | }; |
| 70 | |
| 71 | enum gprs_sns_event { |
| 72 | GPRS_SNS_EV_START, |
| 73 | GPRS_SNS_EV_SIZE, |
| 74 | GPRS_SNS_EV_SIZE_ACK, |
| 75 | GPRS_SNS_EV_CONFIG, |
| 76 | GPRS_SNS_EV_CONFIG_END, /*!< SNS-CONFIG with end flag received */ |
| 77 | GPRS_SNS_EV_CONFIG_ACK, |
| 78 | GPRS_SNS_EV_ADD, |
| 79 | GPRS_SNS_EV_DELETE, |
| 80 | GPRS_SNS_EV_CHANGE_WEIGHT, |
| 81 | GPRS_SNS_EV_NO_NSVC, |
| 82 | }; |
| 83 | |
| 84 | static const struct value_string gprs_sns_event_names[] = { |
| 85 | { GPRS_SNS_EV_START, "START" }, |
| 86 | { GPRS_SNS_EV_SIZE, "SIZE" }, |
| 87 | { GPRS_SNS_EV_SIZE_ACK, "SIZE_ACK" }, |
| 88 | { GPRS_SNS_EV_CONFIG, "CONFIG" }, |
| 89 | { GPRS_SNS_EV_CONFIG_END, "CONFIG_END" }, |
| 90 | { GPRS_SNS_EV_CONFIG_ACK, "CONFIG_ACK" }, |
| 91 | { GPRS_SNS_EV_ADD, "ADD" }, |
| 92 | { GPRS_SNS_EV_DELETE, "DELETE" }, |
| 93 | { GPRS_SNS_EV_CHANGE_WEIGHT, "CHANGE_WEIGHT" }, |
| 94 | { 0, NULL } |
| 95 | }; |
| 96 | |
| 97 | struct ns2_sns_state { |
| 98 | struct gprs_ns2_nse *nse; |
| 99 | |
| 100 | enum ns2_sns_type ip; |
| 101 | |
| 102 | /* initial connection. the initial connection will be terminated |
| 103 | * in configured state or moved into NSE if valid */ |
| 104 | struct osmo_sockaddr initial; |
| 105 | /* all SNS PDU will be sent over this nsvc */ |
| 106 | struct gprs_ns2_vc *sns_nsvc; |
| 107 | |
| 108 | /* local configuration to send to the remote end */ |
| 109 | struct gprs_ns_ie_ip4_elem *ip4_local; |
| 110 | size_t num_ip4_local; |
| 111 | |
| 112 | /* local configuration to send to the remote end */ |
| 113 | struct gprs_ns_ie_ip6_elem *ip6_local; |
| 114 | size_t num_ip6_local; |
| 115 | |
| 116 | /* local configuration about our capabilities in terms of connections to |
| 117 | * remote (SGSN) side */ |
| 118 | size_t num_max_nsvcs; |
| 119 | size_t num_max_ip4_remote; |
| 120 | size_t num_max_ip6_remote; |
| 121 | |
| 122 | /* remote configuration as received */ |
| 123 | struct gprs_ns_ie_ip4_elem *ip4_remote; |
| 124 | unsigned int num_ip4_remote; |
| 125 | |
| 126 | /* remote configuration as received */ |
| 127 | struct gprs_ns_ie_ip6_elem *ip6_remote; |
| 128 | unsigned int num_ip6_remote; |
| 129 | }; |
| 130 | |
| 131 | static inline struct gprs_ns2_nse *nse_inst_from_fi(struct osmo_fsm_inst *fi) |
| 132 | { |
| 133 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 134 | return gss->nse; |
| 135 | } |
| 136 | |
| 137 | /* helper function to compute the sum of all (data or signaling) weights */ |
| 138 | static int ip4_weight_sum(const struct gprs_ns_ie_ip4_elem *ip4, unsigned int num, |
| 139 | bool data_weight) |
| 140 | { |
| 141 | unsigned int i; |
| 142 | int weight_sum = 0; |
| 143 | |
| 144 | for (i = 0; i < num; i++) { |
| 145 | if (data_weight) |
| 146 | weight_sum += ip4[i].data_weight; |
| 147 | else |
| 148 | weight_sum += ip4[i].sig_weight; |
| 149 | } |
| 150 | return weight_sum; |
| 151 | } |
| 152 | #define ip4_weight_sum_data(x,y) ip4_weight_sum(x, y, true) |
| 153 | #define ip4_weight_sum_sig(x,y) ip4_weight_sum(x, y, false) |
| 154 | |
| 155 | /* helper function to compute the sum of all (data or signaling) weights */ |
| 156 | static int ip6_weight_sum(const struct gprs_ns_ie_ip6_elem *ip6, unsigned int num, |
| 157 | bool data_weight) |
| 158 | { |
| 159 | unsigned int i; |
| 160 | int weight_sum = 0; |
| 161 | |
| 162 | for (i = 0; i < num; i++) { |
| 163 | if (data_weight) |
| 164 | weight_sum += ip6[i].data_weight; |
| 165 | else |
| 166 | weight_sum += ip6[i].sig_weight; |
| 167 | } |
| 168 | return weight_sum; |
| 169 | } |
| 170 | #define ip6_weight_sum_data(x,y) ip6_weight_sum(x, y, true) |
| 171 | #define ip6_weight_sum_sig(x,y) ip6_weight_sum(x, y, false) |
| 172 | |
| 173 | static struct gprs_ns2_vc *nsvc_by_ip4_elem(struct gprs_ns2_nse *nse, |
| 174 | const struct gprs_ns_ie_ip4_elem *ip4) |
| 175 | { |
| 176 | struct osmo_sockaddr sa; |
| 177 | /* copy over. Both data structures use network byte order */ |
| 178 | sa.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| 179 | sa.u.sin.sin_port = ip4->udp_port; |
| 180 | sa.u.sin.sin_family = AF_INET; |
| 181 | |
Alexander Couzens | 38b19e8 | 2020-09-23 23:56:37 +0200 | [diff] [blame] | 182 | return gprs_ns2_nsvc_by_sockaddr_nse(nse, &sa); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | static struct gprs_ns2_vc *nsvc_by_ip6_elem(struct gprs_ns2_nse *nse, |
| 186 | const struct gprs_ns_ie_ip6_elem *ip6) |
| 187 | { |
| 188 | struct osmo_sockaddr sa; |
| 189 | /* copy over. Both data structures use network byte order */ |
| 190 | sa.u.sin6.sin6_addr = ip6->ip_addr; |
| 191 | sa.u.sin6.sin6_port = ip6->udp_port; |
| 192 | sa.u.sin6.sin6_family = AF_INET; |
| 193 | |
Alexander Couzens | 38b19e8 | 2020-09-23 23:56:37 +0200 | [diff] [blame] | 194 | return gprs_ns2_nsvc_by_sockaddr_nse(nse, &sa); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 195 | } |
| 196 | |
Alexander Couzens | 125298f | 2020-10-11 21:22:42 +0200 | [diff] [blame] | 197 | /*! Return the initial SNS remote socket address |
| 198 | * \param nse NS Entity |
| 199 | * \return address of the initial SNS connection; NULL in case of error |
| 200 | */ |
| 201 | const struct osmo_sockaddr *gprs_ns2_nse_sns_remote(struct gprs_ns2_nse *nse) |
| 202 | { |
| 203 | struct ns2_sns_state *gss; |
| 204 | |
| 205 | if (!nse->bss_sns_fi) |
| 206 | return NULL; |
| 207 | |
| 208 | gss = (struct ns2_sns_state *) nse->bss_sns_fi->priv; |
| 209 | return &gss->initial; |
| 210 | } |
| 211 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 212 | /*! called when a nsvc is beeing freed */ |
| 213 | void ns2_sns_free_nsvc(struct gprs_ns2_vc *nsvc) |
| 214 | { |
| 215 | struct gprs_ns2_nse *nse; |
| 216 | struct gprs_ns2_vc *tmp; |
| 217 | struct ns2_sns_state *gss; |
| 218 | struct osmo_fsm_inst *fi = nsvc->nse->bss_sns_fi; |
| 219 | |
| 220 | if (!fi) |
| 221 | return; |
| 222 | |
| 223 | gss = (struct ns2_sns_state *) fi->priv; |
| 224 | if (nsvc != gss->sns_nsvc) |
| 225 | return; |
| 226 | |
| 227 | nse = nsvc->nse; |
| 228 | if (nse->alive) { |
| 229 | /* choose a different sns nsvc */ |
| 230 | llist_for_each_entry(tmp, &nse->nsvc, list) { |
| 231 | if (gprs_ns2_vc_is_unblocked(tmp)) |
| 232 | gss->sns_nsvc = tmp; |
| 233 | } |
| 234 | } else { |
| 235 | LOGPFSML(fi, LOGL_ERROR, "NSE %d: no remaining NSVC. Reseting SNS FSM.", nse->nsei); |
| 236 | gss->sns_nsvc = NULL; |
| 237 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_NO_NSVC, NULL); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | static void ns2_nsvc_create_ip4(struct osmo_fsm_inst *fi, |
| 242 | struct gprs_ns2_nse *nse, |
| 243 | const struct gprs_ns_ie_ip4_elem *ip4) |
| 244 | { |
| 245 | struct gprs_ns2_inst *nsi = nse->nsi; |
| 246 | struct gprs_ns2_vc *nsvc; |
| 247 | struct gprs_ns2_vc_bind *bind; |
Alexander Couzens | c068d86 | 2020-10-12 04:11:51 +0200 | [diff] [blame] | 248 | struct osmo_sockaddr remote = { }; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 249 | /* copy over. Both data structures use network byte order */ |
| 250 | remote.u.sin.sin_family = AF_INET; |
| 251 | remote.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| 252 | remote.u.sin.sin_port = ip4->udp_port; |
| 253 | |
| 254 | /* for every bind, create a connection if bind type == IP */ |
| 255 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 256 | /* ignore failed connection */ |
| 257 | nsvc = gprs_ns2_ip_connect_inactive(bind, |
| 258 | &remote, |
| 259 | nse, 0); |
| 260 | if (!nsvc) { |
| 261 | LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG: Failed to create NSVC\n"); |
| 262 | continue; |
| 263 | } |
| 264 | |
| 265 | nsvc->sig_weight = ip4->sig_weight; |
| 266 | nsvc->data_weight = ip4->data_weight; |
| 267 | } |
| 268 | } |
| 269 | |
| 270 | static void ns2_nsvc_create_ip6(struct osmo_fsm_inst *fi, |
| 271 | struct gprs_ns2_nse *nse, |
| 272 | const struct gprs_ns_ie_ip6_elem *ip6) |
| 273 | { |
| 274 | struct gprs_ns2_inst *nsi = nse->nsi; |
| 275 | struct gprs_ns2_vc *nsvc; |
| 276 | struct gprs_ns2_vc_bind *bind; |
| 277 | struct osmo_sockaddr remote = {}; |
| 278 | /* copy over. Both data structures use network byte order */ |
| 279 | remote.u.sin6.sin6_family = AF_INET6; |
| 280 | remote.u.sin6.sin6_addr = ip6->ip_addr; |
| 281 | remote.u.sin6.sin6_port = ip6->udp_port; |
| 282 | |
| 283 | /* for every bind, create a connection if bind type == IP */ |
| 284 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 285 | /* ignore failed connection */ |
| 286 | nsvc = gprs_ns2_ip_connect_inactive(bind, |
| 287 | &remote, |
| 288 | nse, 0); |
| 289 | if (!nsvc) { |
| 290 | LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG: Failed to create NSVC\n"); |
| 291 | continue; |
| 292 | } |
| 293 | |
| 294 | nsvc->sig_weight = ip6->sig_weight; |
| 295 | nsvc->data_weight = ip6->data_weight; |
| 296 | } |
| 297 | } |
| 298 | |
| 299 | |
| 300 | static int create_missing_nsvcs(struct osmo_fsm_inst *fi) |
| 301 | { |
| 302 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 303 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 304 | struct gprs_ns2_vc *nsvc; |
| 305 | struct gprs_ns2_vc_bind *bind; |
| 306 | struct osmo_sockaddr remote = { }; |
| 307 | unsigned int i; |
| 308 | |
| 309 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 310 | const struct gprs_ns_ie_ip4_elem *ip4 = &gss->ip4_remote[i]; |
| 311 | |
| 312 | remote.u.sin.sin_family = AF_INET; |
| 313 | remote.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| 314 | remote.u.sin.sin_port = ip4->udp_port; |
| 315 | |
| 316 | llist_for_each_entry(bind, &nse->nsi->binding, list) { |
| 317 | bool found = false; |
| 318 | |
| 319 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| 320 | if (nsvc->bind != bind) |
| 321 | continue; |
| 322 | |
Alexander Couzens | c4229a4 | 2020-10-11 20:58:04 +0200 | [diff] [blame] | 323 | if (!osmo_sockaddr_cmp(&remote, gprs_ns2_ip_vc_remote(nsvc))) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 324 | found = true; |
| 325 | break; |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | if (!found) { |
| 330 | nsvc = gprs_ns2_ip_connect_inactive(bind, &remote, nse, 0); |
| 331 | if (!nsvc) { |
| 332 | /* TODO: add to a list to send back a NS-STATUS */ |
| 333 | continue; |
| 334 | } |
| 335 | } |
| 336 | |
| 337 | /* update data / signalling weight */ |
| 338 | nsvc->data_weight = ip4->data_weight; |
| 339 | nsvc->sig_weight = ip4->sig_weight; |
| 340 | nsvc->sns_only = false; |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | for (i = 0; i < gss->num_ip6_remote; i++) { |
| 345 | const struct gprs_ns_ie_ip6_elem *ip6 = &gss->ip6_remote[i]; |
| 346 | |
| 347 | remote.u.sin6.sin6_family = AF_INET6; |
| 348 | remote.u.sin6.sin6_addr = ip6->ip_addr; |
| 349 | remote.u.sin6.sin6_port = ip6->udp_port; |
| 350 | |
| 351 | llist_for_each_entry(bind, &nse->nsi->binding, list) { |
| 352 | bool found = false; |
| 353 | |
| 354 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
| 355 | if (nsvc->bind != bind) |
| 356 | continue; |
| 357 | |
Alexander Couzens | c4229a4 | 2020-10-11 20:58:04 +0200 | [diff] [blame] | 358 | if (!osmo_sockaddr_cmp(&remote, gprs_ns2_ip_vc_remote(nsvc))) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 359 | found = true; |
| 360 | break; |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | if (!found) { |
| 365 | nsvc = gprs_ns2_ip_connect_inactive(bind, &remote, nse, 0); |
| 366 | if (!nsvc) { |
| 367 | /* TODO: add to a list to send back a NS-STATUS */ |
| 368 | continue; |
| 369 | } |
| 370 | } |
| 371 | |
| 372 | /* update data / signalling weight */ |
| 373 | nsvc->data_weight = ip6->data_weight; |
| 374 | nsvc->sig_weight = ip6->sig_weight; |
| 375 | nsvc->sns_only = false; |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | |
| 380 | return 0; |
| 381 | } |
| 382 | |
| 383 | /* Add a given remote IPv4 element to gprs_sns_state */ |
| 384 | static int add_remote_ip4_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) |
| 385 | { |
| 386 | unsigned int i; |
| 387 | |
| 388 | if (gss->num_ip4_remote >= gss->num_max_ip4_remote) |
| 389 | return -NS_CAUSE_INVAL_NR_NS_VC; |
| 390 | |
| 391 | /* check for duplicates */ |
| 392 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 393 | if (memcmp(&gss->ip4_remote[i], ip4, sizeof(*ip4))) |
| 394 | continue; |
| 395 | /* TODO: log message duplicate */ |
| 396 | /* TODO: check if this is the correct cause code */ |
| 397 | return -NS_CAUSE_PROTO_ERR_UNSPEC; |
| 398 | } |
| 399 | |
| 400 | gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote, struct gprs_ns_ie_ip4_elem, |
| 401 | gss->num_ip4_remote+1); |
| 402 | gss->ip4_remote[gss->num_ip4_remote] = *ip4; |
| 403 | gss->num_ip4_remote += 1; |
| 404 | return 0; |
| 405 | } |
| 406 | |
| 407 | /* Remove a given remote IPv4 element from gprs_sns_state */ |
| 408 | static int remove_remote_ip4_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) |
| 409 | { |
| 410 | unsigned int i; |
| 411 | |
| 412 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 413 | if (memcmp(&gss->ip4_remote[i], ip4, sizeof(*ip4))) |
| 414 | continue; |
| 415 | /* all array elements < i remain as they are; all > i are shifted left by one */ |
| 416 | memmove(&gss->ip4_remote[i], &gss->ip4_remote[i+1], gss->num_ip4_remote-i-1); |
| 417 | gss->num_ip4_remote -= 1; |
| 418 | return 0; |
| 419 | } |
| 420 | return -1; |
| 421 | } |
| 422 | |
| 423 | /* update the weights for specified remote IPv4 */ |
| 424 | static int update_remote_ip4_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip4_elem *ip4) |
| 425 | { |
| 426 | unsigned int i; |
| 427 | |
| 428 | for (i = 0; i < gss->num_ip4_remote; i++) { |
| 429 | if (gss->ip4_remote[i].ip_addr != ip4->ip_addr || |
| 430 | gss->ip4_remote[i].udp_port != ip4->udp_port) |
| 431 | continue; |
| 432 | |
| 433 | gss->ip4_remote[i].sig_weight = ip4->sig_weight; |
| 434 | gss->ip4_remote[i].data_weight = ip4->data_weight; |
| 435 | return 0; |
| 436 | } |
| 437 | return -1; |
| 438 | } |
| 439 | |
| 440 | /* Add a given remote IPv6 element to gprs_sns_state */ |
| 441 | static int add_remote_ip6_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip6_elem *ip6) |
| 442 | { |
| 443 | if (gss->num_ip6_remote >= gss->num_max_ip6_remote) |
| 444 | return -NS_CAUSE_INVAL_NR_NS_VC; |
| 445 | |
| 446 | gss->ip6_remote = talloc_realloc(gss, gss->ip6_remote, struct gprs_ns_ie_ip6_elem, |
| 447 | gss->num_ip6_remote+1); |
| 448 | gss->ip6_remote[gss->num_ip6_remote] = *ip6; |
| 449 | gss->num_ip6_remote += 1; |
| 450 | return 0; |
| 451 | } |
| 452 | |
| 453 | /* Remove a given remote IPv6 element from gprs_sns_state */ |
| 454 | static int remove_remote_ip6_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip6_elem *ip6) |
| 455 | { |
| 456 | unsigned int i; |
| 457 | |
| 458 | for (i = 0; i < gss->num_ip6_remote; i++) { |
| 459 | if (memcmp(&gss->ip6_remote[i], ip6, sizeof(*ip6))) |
| 460 | continue; |
| 461 | /* all array elements < i remain as they are; all > i are shifted left by one */ |
| 462 | memmove(&gss->ip6_remote[i], &gss->ip6_remote[i+1], gss->num_ip6_remote-i-1); |
| 463 | gss->num_ip6_remote -= 1; |
| 464 | return 0; |
| 465 | } |
| 466 | return -1; |
| 467 | } |
| 468 | |
| 469 | /* update the weights for specified remote IPv6 */ |
| 470 | static int update_remote_ip6_elem(struct ns2_sns_state *gss, const struct gprs_ns_ie_ip6_elem *ip6) |
| 471 | { |
| 472 | unsigned int i; |
| 473 | |
| 474 | for (i = 0; i < gss->num_ip6_remote; i++) { |
| 475 | if (memcmp(&gss->ip6_remote[i].ip_addr, &ip6->ip_addr, sizeof(ip6->ip_addr)) || |
| 476 | gss->ip6_remote[i].udp_port != ip6->udp_port) |
| 477 | continue; |
| 478 | gss->ip6_remote[i].sig_weight = ip6->sig_weight; |
| 479 | gss->ip6_remote[i].data_weight = ip6->data_weight; |
| 480 | return 0; |
| 481 | } |
| 482 | return -1; |
| 483 | } |
| 484 | |
| 485 | static int do_sns_change_weight(struct osmo_fsm_inst *fi, const struct gprs_ns_ie_ip4_elem *ip4, const struct gprs_ns_ie_ip6_elem *ip6) |
| 486 | { |
| 487 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 488 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 489 | struct gprs_ns2_vc *nsvc; |
| 490 | struct osmo_sockaddr sa = {}; |
Alexander Couzens | 9a4cf27 | 2020-10-11 20:48:04 +0200 | [diff] [blame] | 491 | const struct osmo_sockaddr *remote; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 492 | uint8_t new_signal; |
| 493 | uint8_t new_data; |
| 494 | |
| 495 | /* TODO: Upon receiving an SNS-CHANGEWEIGHT PDU, if the resulting sum of the |
| 496 | * signalling weights of all the peer IP endpoints configured for this NSE is |
| 497 | * equal to zero or if the resulting sum of the data weights of all the peer IP |
| 498 | * endpoints configured for this NSE is equal to zero, the BSS/SGSN shall send an |
| 499 | * SNS-ACK PDU with a cause code of "Invalid weights". */ |
| 500 | |
| 501 | if (ip4) { |
| 502 | if (update_remote_ip4_elem(gss, ip4)) |
| 503 | return -NS_CAUSE_UNKN_IP_EP; |
| 504 | |
| 505 | /* copy over. Both data structures use network byte order */ |
| 506 | sa.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| 507 | sa.u.sin.sin_port = ip4->udp_port; |
| 508 | sa.u.sin.sin_family = AF_INET; |
| 509 | new_signal = ip4->sig_weight; |
| 510 | new_data = ip4->data_weight; |
| 511 | } else if (ip6) { |
| 512 | if (update_remote_ip6_elem(gss, ip6)) |
| 513 | return -NS_CAUSE_UNKN_IP_EP; |
| 514 | |
| 515 | /* copy over. Both data structures use network byte order */ |
| 516 | sa.u.sin6.sin6_addr = ip6->ip_addr; |
| 517 | sa.u.sin6.sin6_port = ip6->udp_port; |
| 518 | sa.u.sin6.sin6_family = AF_INET6; |
| 519 | new_signal = ip6->sig_weight; |
| 520 | new_data = ip6->data_weight; |
| 521 | } else { |
| 522 | OSMO_ASSERT(false); |
| 523 | } |
| 524 | |
| 525 | llist_for_each_entry(nsvc, &nse->nsvc, list) { |
Alexander Couzens | c4229a4 | 2020-10-11 20:58:04 +0200 | [diff] [blame] | 526 | remote = gprs_ns2_ip_vc_remote(nsvc); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 527 | /* all nsvc in NSE should be IP/UDP nsvc */ |
| 528 | OSMO_ASSERT(remote); |
| 529 | |
| 530 | if (osmo_sockaddr_cmp(&sa, remote)) |
| 531 | continue; |
| 532 | |
| 533 | LOGPFSML(fi, LOGL_INFO, "CHANGE-WEIGHT NS-VC %s data_weight %u->%u, sig_weight %u->%u\n", |
| 534 | gprs_ns2_ll_str(nsvc), nsvc->data_weight, new_data, |
| 535 | nsvc->sig_weight, new_signal); |
| 536 | |
| 537 | nsvc->data_weight = new_data; |
| 538 | nsvc->sig_weight = new_signal; |
| 539 | } |
| 540 | |
| 541 | return 0; |
| 542 | } |
| 543 | |
| 544 | static int do_sns_delete(struct osmo_fsm_inst *fi, |
| 545 | const struct gprs_ns_ie_ip4_elem *ip4, |
| 546 | const struct gprs_ns_ie_ip6_elem *ip6) |
| 547 | { |
| 548 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 549 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 550 | struct gprs_ns2_vc *nsvc, *tmp; |
Alexander Couzens | 9a4cf27 | 2020-10-11 20:48:04 +0200 | [diff] [blame] | 551 | const struct osmo_sockaddr *remote; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 552 | struct osmo_sockaddr sa = {}; |
| 553 | |
| 554 | if (ip4) { |
| 555 | if (remove_remote_ip4_elem(gss, ip4) < 0) |
| 556 | return -NS_CAUSE_UNKN_IP_EP; |
| 557 | /* copy over. Both data structures use network byte order */ |
| 558 | sa.u.sin.sin_addr.s_addr = ip4->ip_addr; |
| 559 | sa.u.sin.sin_port = ip4->udp_port; |
| 560 | sa.u.sin.sin_family = AF_INET; |
| 561 | } else if (ip6) { |
| 562 | if (remove_remote_ip6_elem(gss, ip6)) |
| 563 | return -NS_CAUSE_UNKN_IP_EP; |
| 564 | |
| 565 | /* copy over. Both data structures use network byte order */ |
| 566 | sa.u.sin6.sin6_addr = ip6->ip_addr; |
| 567 | sa.u.sin6.sin6_port = ip6->udp_port; |
| 568 | sa.u.sin6.sin6_family = AF_INET6; |
| 569 | } else { |
| 570 | OSMO_ASSERT(false); |
| 571 | } |
| 572 | |
| 573 | llist_for_each_entry_safe(nsvc, tmp, &nse->nsvc, list) { |
Alexander Couzens | c4229a4 | 2020-10-11 20:58:04 +0200 | [diff] [blame] | 574 | remote = gprs_ns2_ip_vc_remote(nsvc); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 575 | /* all nsvc in NSE should be IP/UDP nsvc */ |
| 576 | OSMO_ASSERT(remote); |
| 577 | if (osmo_sockaddr_cmp(&sa, remote)) |
| 578 | continue; |
| 579 | |
| 580 | LOGPFSML(fi, LOGL_INFO, "DELETE NS-VC %s\n", gprs_ns2_ll_str(nsvc)); |
| 581 | gprs_ns2_free_nsvc(nsvc); |
| 582 | } |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | static int do_sns_add(struct osmo_fsm_inst *fi, |
| 588 | const struct gprs_ns_ie_ip4_elem *ip4, |
| 589 | const struct gprs_ns_ie_ip6_elem *ip6) |
| 590 | { |
| 591 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 592 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 593 | struct gprs_ns2_vc *nsvc; |
| 594 | int rc = 0; |
| 595 | |
| 596 | /* Upon receiving an SNS-ADD PDU, if the consequent number of IPv4 endpoints |
| 597 | * exceeds the number of IPv4 endpoints supported by the NSE, the NSE shall send |
| 598 | * an SNS-ACK PDU with a cause code set to "Invalid number of IP4 Endpoints". */ |
| 599 | switch (gss->ip) { |
| 600 | case IPv4: |
| 601 | rc = add_remote_ip4_elem(gss, ip4); |
| 602 | break; |
| 603 | case IPv6: |
| 604 | rc = add_remote_ip6_elem(gss, ip6); |
| 605 | break; |
| 606 | default: |
| 607 | /* the gss->ip is initialized with the bss */ |
| 608 | OSMO_ASSERT(false); |
| 609 | } |
| 610 | |
| 611 | if (rc) |
| 612 | return rc; |
| 613 | |
| 614 | /* Upon receiving an SNS-ADD PDU containing an already configured IP endpoint the |
| 615 | * NSE shall send an SNS-ACK PDU with the cause code "Protocol error - |
| 616 | * unspecified" */ |
| 617 | switch (gss->ip) { |
| 618 | case IPv4: |
| 619 | nsvc = nsvc_by_ip4_elem(nse, ip4); |
| 620 | if (nsvc) { |
| 621 | /* the nsvc should be already in sync with the ip4 / ip6 elements */ |
| 622 | return -NS_CAUSE_PROTO_ERR_UNSPEC; |
| 623 | } |
| 624 | |
| 625 | /* TODO: failure case */ |
| 626 | ns2_nsvc_create_ip4(fi, nse, ip4); |
| 627 | break; |
| 628 | case IPv6: |
| 629 | nsvc = nsvc_by_ip6_elem(nse, ip6); |
| 630 | if (nsvc) { |
| 631 | /* the nsvc should be already in sync with the ip4 / ip6 elements */ |
| 632 | return -NS_CAUSE_PROTO_ERR_UNSPEC; |
| 633 | } |
| 634 | |
| 635 | /* TODO: failure case */ |
| 636 | ns2_nsvc_create_ip6(fi, nse, ip6); |
| 637 | break; |
| 638 | } |
| 639 | |
| 640 | gprs_ns2_start_alive_all_nsvcs(nse); |
| 641 | |
| 642 | return 0; |
| 643 | } |
| 644 | |
| 645 | |
| 646 | static void ns2_sns_st_unconfigured(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 647 | { |
| 648 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 649 | struct gprs_ns2_inst *nsi = nse->nsi; |
| 650 | |
| 651 | switch (event) { |
| 652 | case GPRS_SNS_EV_START: |
| 653 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1); |
| 654 | break; |
| 655 | default: |
| 656 | OSMO_ASSERT(0); |
| 657 | } |
| 658 | } |
| 659 | |
| 660 | static void ns2_sns_st_size(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 661 | { |
| 662 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 663 | struct gprs_ns2_inst *nsi = nse->nsi; |
| 664 | struct tlv_parsed *tp = NULL; |
| 665 | |
| 666 | switch (event) { |
| 667 | case GPRS_SNS_EV_SIZE_ACK: |
| 668 | tp = data; |
| 669 | if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { |
| 670 | LOGPFSML(fi, LOGL_ERROR, "SNS-SIZE-ACK with cause %s\n", |
| 671 | gprs_ns2_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); |
| 672 | /* TODO: What to do? */ |
| 673 | } else { |
| 674 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS, |
| 675 | nsi->timeout[NS_TOUT_TSNS_PROV], 2); |
| 676 | } |
| 677 | break; |
| 678 | default: |
| 679 | OSMO_ASSERT(0); |
| 680 | } |
| 681 | } |
| 682 | |
| 683 | static void ns2_sns_st_size_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| 684 | { |
| 685 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 686 | |
| 687 | if (old_state != GPRS_SNS_ST_UNCONFIGURED) |
Alexander Couzens | bf95f0f | 2020-10-01 22:56:03 +0200 | [diff] [blame] | 688 | ns2_prim_status_ind(gss->nse, 0, NS_AFF_CAUSE_SNS_FAILURE); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 689 | |
| 690 | if (gss->num_max_ip4_remote > 0) |
| 691 | ns2_tx_sns_size(gss->sns_nsvc, true, gss->num_max_nsvcs, gss->num_max_ip4_remote, -1); |
| 692 | else |
| 693 | ns2_tx_sns_size(gss->sns_nsvc, true, gss->num_max_nsvcs, -1, gss->num_max_ip6_remote); |
| 694 | |
| 695 | } |
| 696 | |
| 697 | static void ns2_sns_st_config_bss(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 698 | { |
| 699 | struct tlv_parsed *tp = NULL; |
| 700 | |
| 701 | switch (event) { |
| 702 | case GPRS_SNS_EV_CONFIG_ACK: |
| 703 | tp = (struct tlv_parsed *) data; |
| 704 | if (TLVP_VAL_MINLEN(tp, NS_IE_CAUSE, 1)) { |
| 705 | LOGPFSML(fi, LOGL_ERROR, "SNS-CONFIG-ACK with cause %s\n", |
| 706 | gprs_ns2_cause_str(*TLVP_VAL(tp, NS_IE_CAUSE))); |
| 707 | /* TODO: What to do? */ |
| 708 | } else { |
| 709 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_SGSN, 0, 0); |
| 710 | } |
| 711 | break; |
| 712 | default: |
| 713 | OSMO_ASSERT(0); |
| 714 | } |
| 715 | } |
| 716 | |
| 717 | static void ns2_sns_st_config_bss_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| 718 | { |
| 719 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 720 | /* Transmit SNS-CONFIG */ |
| 721 | /* TODO: ipv6 */ |
| 722 | switch (gss->ip) { |
| 723 | case IPv4: |
| 724 | ns2_tx_sns_config(gss->sns_nsvc, true, |
| 725 | gss->ip4_local, gss->num_ip4_local, |
| 726 | NULL, 0); |
| 727 | break; |
| 728 | case IPv6: |
| 729 | ns2_tx_sns_config(gss->sns_nsvc, true, |
| 730 | NULL, 0, |
| 731 | gss->ip6_local, gss->num_ip6_local); |
| 732 | break; |
| 733 | } |
| 734 | } |
| 735 | |
| 736 | |
| 737 | static void ns_sns_st_config_sgsn_ip4(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 738 | { |
| 739 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 740 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 741 | const struct gprs_ns_ie_ip4_elem *v4_list; |
| 742 | unsigned int num_v4; |
| 743 | struct tlv_parsed *tp = NULL; |
| 744 | |
| 745 | uint8_t cause; |
| 746 | |
| 747 | tp = (struct tlv_parsed *) data; |
| 748 | |
| 749 | if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 750 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 751 | ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| 752 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| 753 | return; |
| 754 | } |
| 755 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 756 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
| 757 | /* realloc to the new size */ |
| 758 | gss->ip4_remote = talloc_realloc(gss, gss->ip4_remote, |
| 759 | struct gprs_ns_ie_ip4_elem, |
| 760 | gss->num_ip4_remote+num_v4); |
| 761 | /* append the new entries to the end of the list */ |
| 762 | memcpy(&gss->ip4_remote[gss->num_ip4_remote], v4_list, num_v4*sizeof(*v4_list)); |
| 763 | gss->num_ip4_remote += num_v4; |
| 764 | |
| 765 | LOGPFSML(fi, LOGL_INFO, "Rx SNS-CONFIG: Remote IPv4 list now %u entries\n", |
| 766 | gss->num_ip4_remote); |
| 767 | if (event == GPRS_SNS_EV_CONFIG_END) { |
| 768 | /* check if sum of data / sig weights == 0 */ |
| 769 | if (ip4_weight_sum_data(gss->ip4_remote, gss->num_ip4_remote) == 0 || |
| 770 | ip4_weight_sum_sig(gss->ip4_remote, gss->num_ip4_remote) == 0) { |
| 771 | cause = NS_CAUSE_INVAL_WEIGH; |
| 772 | ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| 773 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| 774 | return; |
| 775 | } |
| 776 | create_missing_nsvcs(fi); |
| 777 | ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| 778 | /* start the test procedure on ALL NSVCs! */ |
| 779 | gprs_ns2_start_alive_all_nsvcs(nse); |
| 780 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, 0, 0); |
| 781 | } else { |
| 782 | /* just send CONFIG-ACK */ |
| 783 | ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| 784 | } |
| 785 | } |
| 786 | |
| 787 | static void ns_sns_st_config_sgsn_ip6(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 788 | { |
| 789 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 790 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 791 | const struct gprs_ns_ie_ip6_elem *v6_list; |
| 792 | unsigned int num_v6; |
| 793 | struct tlv_parsed *tp = NULL; |
| 794 | |
| 795 | uint8_t cause; |
| 796 | |
| 797 | tp = (struct tlv_parsed *) data; |
| 798 | |
| 799 | if (!TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| 800 | cause = NS_CAUSE_INVAL_NR_IPv6_EP; |
| 801 | ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| 802 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| 803 | return; |
| 804 | } |
| 805 | v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| 806 | num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
| 807 | /* realloc to the new size */ |
| 808 | gss->ip6_remote = talloc_realloc(gss, gss->ip6_remote, |
| 809 | struct gprs_ns_ie_ip6_elem, |
| 810 | gss->num_ip6_remote+num_v6); |
| 811 | /* append the new entries to the end of the list */ |
| 812 | memcpy(&gss->ip6_remote[gss->num_ip6_remote], v6_list, num_v6*sizeof(*v6_list)); |
| 813 | gss->num_ip6_remote += num_v6; |
| 814 | |
| 815 | LOGPFSML(fi, LOGL_INFO, "Rx SNS-CONFIG: Remote IPv6 list now %u entries\n", |
| 816 | gss->num_ip6_remote); |
| 817 | if (event == GPRS_SNS_EV_CONFIG_END) { |
| 818 | /* check if sum of data / sig weights == 0 */ |
| 819 | if (ip6_weight_sum_data(gss->ip6_remote, gss->num_ip6_remote) == 0 || |
| 820 | ip6_weight_sum_sig(gss->ip6_remote, gss->num_ip6_remote) == 0) { |
| 821 | cause = NS_CAUSE_INVAL_WEIGH; |
| 822 | ns2_tx_sns_config_ack(gss->sns_nsvc, &cause); |
| 823 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_UNCONFIGURED, 0, 0); |
| 824 | return; |
| 825 | } |
| 826 | create_missing_nsvcs(fi); |
| 827 | ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| 828 | /* start the test procedure on ALL NSVCs! */ |
| 829 | gprs_ns2_start_alive_all_nsvcs(nse); |
| 830 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIGURED, 0, 0); |
| 831 | } else { |
| 832 | /* just send CONFIG-ACK */ |
| 833 | ns2_tx_sns_config_ack(gss->sns_nsvc, NULL); |
| 834 | } |
| 835 | } |
| 836 | |
| 837 | static void ns2_sns_st_config_sgsn(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 838 | { |
| 839 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 840 | |
| 841 | switch (event) { |
| 842 | case GPRS_SNS_EV_CONFIG_END: |
| 843 | case GPRS_SNS_EV_CONFIG: |
| 844 | |
| 845 | #if 0 /* part of incoming SNS-SIZE (doesn't happen on BSS side */ |
| 846 | if (TLVP_PRESENT(tp, NS_IE_RESET_FLAG)) { |
| 847 | /* reset all existing config */ |
| 848 | if (gss->ip4_remote) |
| 849 | talloc_free(gss->ip4_remote); |
| 850 | gss->num_ip4_remote = 0; |
| 851 | } |
| 852 | #endif |
| 853 | /* TODO: reject IPv6 elements on IPv4 mode and vice versa */ |
| 854 | switch (gss->ip) { |
| 855 | case IPv4: |
| 856 | ns_sns_st_config_sgsn_ip4(fi, event, data); |
| 857 | break; |
| 858 | case IPv6: |
| 859 | ns_sns_st_config_sgsn_ip6(fi, event, data); |
| 860 | break; |
| 861 | default: |
| 862 | OSMO_ASSERT(0); |
| 863 | } |
| 864 | break; |
| 865 | default: |
| 866 | OSMO_ASSERT(0); |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | /* called when receiving GPRS_SNS_EV_ADD in state configure */ |
| 871 | static void ns2_sns_st_configured_add(struct osmo_fsm_inst *fi, |
| 872 | struct ns2_sns_state *gss, |
| 873 | struct tlv_parsed *tp) |
| 874 | { |
| 875 | const struct gprs_ns_ie_ip4_elem *v4_list = NULL; |
| 876 | const struct gprs_ns_ie_ip6_elem *v6_list = NULL; |
| 877 | int num_v4 = 0, num_v6 = 0; |
| 878 | uint8_t trans_id, cause = 0xff; |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 879 | unsigned int i; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 880 | int rc = 0; |
| 881 | |
| 882 | /* TODO: refactor EV_ADD/CHANGE/REMOVE by |
| 883 | * check uniqueness within the lists (no doublicate entries) |
| 884 | * check not-known-by-us and sent back a list of unknown/known values |
| 885 | * (abnormal behaviour according to 48.016) |
| 886 | */ |
| 887 | |
| 888 | trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| 889 | if (gss->ip == IPv4) { |
| 890 | if (!TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 891 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 892 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 893 | return; |
| 894 | } |
| 895 | |
| 896 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 897 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 898 | for (i = 0; i < num_v4; i++) { |
| 899 | unsigned int j; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 900 | rc = do_sns_add(fi, &v4_list[i], NULL); |
| 901 | if (rc < 0) { |
| 902 | /* rollback/undo to restore previous state */ |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 903 | for (j = 0; j < i; j++) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 904 | do_sns_delete(fi, &v4_list[j], NULL); |
| 905 | cause = -rc; |
| 906 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 907 | break; |
| 908 | } |
| 909 | } |
| 910 | } else { /* IPv6 */ |
| 911 | if (!TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| 912 | cause = NS_CAUSE_INVAL_NR_IPv6_EP; |
| 913 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 914 | return; |
| 915 | } |
| 916 | |
| 917 | v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| 918 | num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 919 | for (i = 0; i < num_v6; i++) { |
| 920 | unsigned int j; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 921 | rc = do_sns_add(fi, NULL, &v6_list[i]); |
| 922 | if (rc < 0) { |
| 923 | /* rollback/undo to restore previous state */ |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 924 | for (j = 0; j < i; j++) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 925 | do_sns_delete(fi, NULL, &v6_list[j]); |
| 926 | cause = -rc; |
| 927 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 928 | break; |
| 929 | } |
| 930 | } |
| 931 | } |
| 932 | |
| 933 | /* TODO: correct behaviour is to answer to the *same* NSVC from which the SNS_ADD was received */ |
| 934 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, NULL, v4_list, num_v4, v6_list, num_v6); |
| 935 | } |
| 936 | |
| 937 | static void ns2_sns_st_configured_delete(struct osmo_fsm_inst *fi, |
| 938 | struct ns2_sns_state *gss, |
| 939 | struct tlv_parsed *tp) |
| 940 | { |
| 941 | const struct gprs_ns_ie_ip4_elem *v4_list = NULL; |
| 942 | const struct gprs_ns_ie_ip6_elem *v6_list = NULL; |
| 943 | int num_v4 = 0, num_v6 = 0; |
| 944 | uint8_t trans_id, cause = 0xff; |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 945 | unsigned int i; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 946 | int rc = 0; |
| 947 | |
| 948 | /* TODO: split up delete into v4 + v6 |
| 949 | * TODO: check if IPv4_LIST or IP_ADDR(v4) is present on IPv6 and vice versa |
| 950 | * TODO: check if IPv4_LIST/IPv6_LIST and IP_ADDR is present at the same time |
| 951 | */ |
| 952 | trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| 953 | if (gss->ip == IPv4) { |
| 954 | if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 955 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 956 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 957 | for ( i = 0; i < num_v4; i++) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 958 | rc = do_sns_delete(fi, &v4_list[i], NULL); |
| 959 | if (rc < 0) { |
| 960 | cause = -rc; |
| 961 | /* continue to delete others */ |
| 962 | } |
| 963 | } |
| 964 | if (cause != 0xff) { |
| 965 | /* TODO: create list of not-deleted and return it */ |
| 966 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 967 | return; |
| 968 | } |
| 969 | |
| 970 | } else if (TLVP_PRESENT(tp, NS_IE_IP_ADDR) && TLVP_LEN(tp, NS_IE_IP_ADDR) == 5) { |
| 971 | /* delete all NS-VCs for given IPv4 address */ |
| 972 | const uint8_t *ie = TLVP_VAL(tp, NS_IE_IP_ADDR); |
| 973 | struct gprs_ns_ie_ip4_elem *ip4_remote; |
| 974 | uint32_t ip_addr = *(uint32_t *)(ie+1); |
| 975 | if (ie[0] != 0x01) { /* Address Type != IPv4 */ |
| 976 | cause = NS_CAUSE_UNKN_IP_ADDR; |
| 977 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 978 | return; |
| 979 | } |
| 980 | /* make a copy as do_sns_delete() will change the array underneath us */ |
| 981 | ip4_remote = talloc_memdup(fi, gss->ip4_remote, |
| 982 | gss->num_ip4_remote * sizeof(*v4_list)); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 983 | for (i = 0; i < gss->num_ip4_remote; i++) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 984 | if (ip4_remote[i].ip_addr == ip_addr) { |
| 985 | rc = do_sns_delete(fi, &ip4_remote[i], NULL); |
| 986 | if (rc < 0) { |
| 987 | cause = -rc; |
| 988 | /* continue to delete others */ |
| 989 | } |
| 990 | } |
| 991 | } |
| 992 | talloc_free(ip4_remote); |
| 993 | if (cause != 0xff) { |
| 994 | /* TODO: create list of not-deleted and return it */ |
| 995 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 996 | return; |
| 997 | } |
| 998 | } else { |
| 999 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 1000 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1001 | return; |
| 1002 | } |
| 1003 | } else { /* IPv6 */ |
| 1004 | if (TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| 1005 | v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| 1006 | num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 1007 | for (i = 0; i < num_v6; i++) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1008 | rc = do_sns_delete(fi, NULL, &v6_list[i]); |
| 1009 | if (rc < 0) { |
| 1010 | cause = -rc; |
| 1011 | /* continue to delete others */ |
| 1012 | } |
| 1013 | } |
| 1014 | if (cause != 0xff) { |
| 1015 | /* TODO: create list of not-deleted and return it */ |
| 1016 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1017 | return; |
| 1018 | } |
| 1019 | } else if (TLVP_PRES_LEN(tp, NS_IE_IP_ADDR, 17)) { |
| 1020 | /* delete all NS-VCs for given IPv4 address */ |
| 1021 | const uint8_t *ie = TLVP_VAL(tp, NS_IE_IP_ADDR); |
| 1022 | struct gprs_ns_ie_ip6_elem *ip6_remote; |
| 1023 | struct in6_addr ip6_addr; |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 1024 | unsigned int i; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1025 | if (ie[0] != 0x02) { /* Address Type != IPv6 */ |
| 1026 | cause = NS_CAUSE_UNKN_IP_ADDR; |
| 1027 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1028 | return; |
| 1029 | } |
| 1030 | memcpy(&ip6_addr, (ie+1), sizeof(struct in6_addr)); |
| 1031 | /* make a copy as do_sns_delete() will change the array underneath us */ |
| 1032 | ip6_remote = talloc_memdup(fi, gss->ip6_remote, |
| 1033 | gss->num_ip6_remote * sizeof(*v4_list)); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 1034 | for (i = 0; i < gss->num_ip6_remote; i++) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1035 | if (!memcmp(&ip6_remote[i].ip_addr, &ip6_addr, sizeof(struct in6_addr))) { |
| 1036 | rc = do_sns_delete(fi, NULL, &ip6_remote[i]); |
| 1037 | if (rc < 0) { |
| 1038 | cause = -rc; |
| 1039 | /* continue to delete others */ |
| 1040 | } |
| 1041 | } |
| 1042 | } |
| 1043 | |
| 1044 | talloc_free(ip6_remote); |
| 1045 | if (cause != 0xff) { |
| 1046 | /* TODO: create list of not-deleted and return it */ |
| 1047 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1048 | return; |
| 1049 | } |
| 1050 | } else { |
| 1051 | cause = NS_CAUSE_INVAL_NR_IPv6_EP; |
| 1052 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1053 | return; |
| 1054 | } |
| 1055 | } |
| 1056 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, NULL, v4_list, num_v4, v6_list, num_v6); |
| 1057 | } |
| 1058 | |
| 1059 | static void ns2_sns_st_configured_change(struct osmo_fsm_inst *fi, |
| 1060 | struct ns2_sns_state *gss, |
| 1061 | struct tlv_parsed *tp) |
| 1062 | { |
| 1063 | const struct gprs_ns_ie_ip4_elem *v4_list = NULL; |
| 1064 | const struct gprs_ns_ie_ip6_elem *v6_list = NULL; |
| 1065 | int num_v4 = 0, num_v6 = 0; |
| 1066 | uint8_t trans_id, cause = 0xff; |
| 1067 | int rc = 0; |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 1068 | unsigned int i; |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1069 | |
| 1070 | trans_id = *TLVP_VAL(tp, NS_IE_TRANS_ID); |
| 1071 | if (TLVP_PRESENT(tp, NS_IE_IPv4_LIST)) { |
| 1072 | v4_list = (const struct gprs_ns_ie_ip4_elem *) TLVP_VAL(tp, NS_IE_IPv4_LIST); |
| 1073 | num_v4 = TLVP_LEN(tp, NS_IE_IPv4_LIST) / sizeof(*v4_list); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 1074 | for (i = 0; i < num_v4; i++) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1075 | rc = do_sns_change_weight(fi, &v4_list[i], NULL); |
| 1076 | if (rc < 0) { |
| 1077 | cause = -rc; |
| 1078 | /* continue to others */ |
| 1079 | } |
| 1080 | } |
| 1081 | if (cause != 0xff) { |
| 1082 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1083 | return; |
| 1084 | } |
| 1085 | } else if (TLVP_PRESENT(tp, NS_IE_IPv6_LIST)) { |
| 1086 | v6_list = (const struct gprs_ns_ie_ip6_elem *) TLVP_VAL(tp, NS_IE_IPv6_LIST); |
| 1087 | num_v6 = TLVP_LEN(tp, NS_IE_IPv6_LIST) / sizeof(*v6_list); |
Harald Welte | 7da6ace | 2020-09-18 09:48:05 +0200 | [diff] [blame] | 1088 | for (i = 0; i < num_v6; i++) { |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1089 | rc = do_sns_change_weight(fi, NULL, &v6_list[i]); |
| 1090 | if (rc < 0) { |
| 1091 | cause = -rc; |
| 1092 | /* continue to others */ |
| 1093 | } |
| 1094 | } |
| 1095 | if (cause != 0xff) { |
| 1096 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1097 | return; |
| 1098 | } |
| 1099 | } else { |
| 1100 | cause = NS_CAUSE_INVAL_NR_IPv4_EP; |
| 1101 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, &cause, NULL, 0, NULL, 0); |
| 1102 | return; |
| 1103 | } |
| 1104 | ns2_tx_sns_ack(gss->sns_nsvc, trans_id, NULL, v4_list, num_v4, v6_list, num_v6); |
| 1105 | } |
| 1106 | |
| 1107 | static void ns2_sns_st_configured(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 1108 | { |
| 1109 | struct ns2_sns_state *gss = (struct ns2_sns_state *) fi->priv; |
| 1110 | struct tlv_parsed *tp = data; |
| 1111 | |
| 1112 | switch (event) { |
| 1113 | case GPRS_SNS_EV_ADD: |
| 1114 | ns2_sns_st_configured_add(fi, gss, tp); |
| 1115 | break; |
| 1116 | case GPRS_SNS_EV_DELETE: |
| 1117 | ns2_sns_st_configured_delete(fi, gss, tp); |
| 1118 | break; |
| 1119 | case GPRS_SNS_EV_CHANGE_WEIGHT: |
| 1120 | ns2_sns_st_configured_change(fi, gss, tp); |
| 1121 | break; |
| 1122 | } |
| 1123 | } |
| 1124 | |
| 1125 | static void ns2_sns_st_configured_onenter(struct osmo_fsm_inst *fi, uint32_t old_state) |
| 1126 | { |
| 1127 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
Alexander Couzens | bf95f0f | 2020-10-01 22:56:03 +0200 | [diff] [blame] | 1128 | ns2_prim_status_ind(nse, 0, NS_AFF_CAUSE_SNS_CONFIGURED); |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1129 | } |
| 1130 | |
| 1131 | static const struct osmo_fsm_state ns2_sns_bss_states[] = { |
| 1132 | [GPRS_SNS_ST_UNCONFIGURED] = { |
| 1133 | .in_event_mask = S(GPRS_SNS_EV_START), |
| 1134 | .out_state_mask = S(GPRS_SNS_ST_SIZE), |
| 1135 | .name = "UNCONFIGURED", |
| 1136 | .action = ns2_sns_st_unconfigured, |
| 1137 | }, |
| 1138 | [GPRS_SNS_ST_SIZE] = { |
| 1139 | .in_event_mask = S(GPRS_SNS_EV_SIZE_ACK), |
| 1140 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| 1141 | S(GPRS_SNS_ST_SIZE) | |
| 1142 | S(GPRS_SNS_ST_CONFIG_BSS), |
| 1143 | .name = "SIZE", |
| 1144 | .action = ns2_sns_st_size, |
| 1145 | .onenter = ns2_sns_st_size_onenter, |
| 1146 | }, |
| 1147 | [GPRS_SNS_ST_CONFIG_BSS] = { |
| 1148 | .in_event_mask = S(GPRS_SNS_EV_CONFIG_ACK), |
| 1149 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| 1150 | S(GPRS_SNS_ST_CONFIG_BSS) | |
| 1151 | S(GPRS_SNS_ST_CONFIG_SGSN) | |
| 1152 | S(GPRS_SNS_ST_SIZE), |
| 1153 | .name = "CONFIG_BSS", |
| 1154 | .action = ns2_sns_st_config_bss, |
| 1155 | .onenter = ns2_sns_st_config_bss_onenter, |
| 1156 | }, |
| 1157 | [GPRS_SNS_ST_CONFIG_SGSN] = { |
| 1158 | .in_event_mask = S(GPRS_SNS_EV_CONFIG) | |
| 1159 | S(GPRS_SNS_EV_CONFIG_END), |
| 1160 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED) | |
| 1161 | S(GPRS_SNS_ST_CONFIG_SGSN) | |
| 1162 | S(GPRS_SNS_ST_CONFIGURED) | |
| 1163 | S(GPRS_SNS_ST_SIZE), |
| 1164 | .name = "CONFIG_SGSN", |
| 1165 | .action = ns2_sns_st_config_sgsn, |
| 1166 | }, |
| 1167 | [GPRS_SNS_ST_CONFIGURED] = { |
| 1168 | .in_event_mask = S(GPRS_SNS_EV_ADD) | |
| 1169 | S(GPRS_SNS_EV_DELETE) | |
| 1170 | S(GPRS_SNS_EV_CHANGE_WEIGHT), |
| 1171 | .out_state_mask = S(GPRS_SNS_ST_UNCONFIGURED), |
| 1172 | .name = "CONFIGURED", |
| 1173 | .action = ns2_sns_st_configured, |
| 1174 | .onenter = ns2_sns_st_configured_onenter, |
| 1175 | }, |
| 1176 | }; |
| 1177 | |
| 1178 | static int ns2_sns_fsm_bss_timer_cb(struct osmo_fsm_inst *fi) |
| 1179 | { |
| 1180 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 1181 | struct gprs_ns2_inst *nsi = nse->nsi; |
| 1182 | |
| 1183 | switch (fi->T) { |
| 1184 | case 1: |
| 1185 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nsi->timeout[NS_TOUT_TSNS_PROV], 1); |
| 1186 | break; |
| 1187 | case 2: |
| 1188 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_CONFIG_BSS, nsi->timeout[NS_TOUT_TSNS_PROV], 2); |
| 1189 | break; |
| 1190 | } |
| 1191 | return 0; |
| 1192 | } |
| 1193 | |
| 1194 | static void ns2_sns_st_all_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 1195 | { |
| 1196 | struct gprs_ns2_nse *nse = nse_inst_from_fi(fi); |
| 1197 | |
| 1198 | /* reset when receiving GPRS_SNS_EV_NO_NSVC */ |
| 1199 | osmo_fsm_inst_state_chg(fi, GPRS_SNS_ST_SIZE, nse->nsi->timeout[NS_TOUT_TSNS_PROV], 3); |
| 1200 | } |
| 1201 | |
| 1202 | static struct osmo_fsm gprs_ns2_sns_bss_fsm = { |
| 1203 | .name = "GPRS-NS2-SNS-BSS", |
| 1204 | .states = ns2_sns_bss_states, |
| 1205 | .num_states = ARRAY_SIZE(ns2_sns_bss_states), |
| 1206 | .allstate_event_mask = GPRS_SNS_EV_NO_NSVC, |
| 1207 | .allstate_action = ns2_sns_st_all_action, |
| 1208 | .cleanup = NULL, |
| 1209 | .timer_cb = ns2_sns_fsm_bss_timer_cb, |
| 1210 | /* .log_subsys = DNS, "is not constant" */ |
| 1211 | .event_names = gprs_sns_event_names, |
| 1212 | .pre_term = NULL, |
| 1213 | .log_subsys = DLNS, |
| 1214 | }; |
| 1215 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1216 | /*! Allocate an IP-SNS FSM for the BSS side. |
| 1217 | * \param[in] nse NS Entity in which the FSM runs |
| 1218 | * \param[in] id string identifier |
| 1219 | * \retruns FSM instance on success; NULL on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1220 | struct osmo_fsm_inst *ns2_sns_bss_fsm_alloc(struct gprs_ns2_nse *nse, |
| 1221 | const char *id) |
| 1222 | { |
| 1223 | struct osmo_fsm_inst *fi; |
| 1224 | struct ns2_sns_state *gss; |
| 1225 | |
| 1226 | fi = osmo_fsm_inst_alloc(&gprs_ns2_sns_bss_fsm, nse, NULL, LOGL_DEBUG, id); |
| 1227 | if (!fi) |
| 1228 | return fi; |
| 1229 | |
| 1230 | gss = talloc_zero(fi, struct ns2_sns_state); |
| 1231 | if (!gss) |
| 1232 | goto err; |
| 1233 | |
| 1234 | fi->priv = gss; |
| 1235 | gss->nse = nse; |
| 1236 | |
| 1237 | return fi; |
| 1238 | err: |
| 1239 | osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL); |
| 1240 | return NULL; |
| 1241 | } |
| 1242 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1243 | /*! Start an IP-SNS FSM. |
| 1244 | * \param[in] nse NS Entity whose IP-SNS FSM shall be started |
| 1245 | * \param[in] nsvc Initial NS-VC |
| 1246 | * \param[in] remote remote (SGSN) address |
| 1247 | * \returns 0 on success; negative on error */ |
Vadim Yanitskiy | a07f25e | 2020-10-09 21:47:01 +0700 | [diff] [blame] | 1248 | int ns2_sns_bss_fsm_start(struct gprs_ns2_nse *nse, struct gprs_ns2_vc *nsvc, |
| 1249 | const struct osmo_sockaddr *remote) |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1250 | { |
| 1251 | struct osmo_fsm_inst *fi = nse->bss_sns_fi; |
| 1252 | struct ns2_sns_state *gss = (struct ns2_sns_state *) nse->bss_sns_fi->priv; |
| 1253 | struct gprs_ns_ie_ip4_elem *ip4_elems; |
| 1254 | struct gprs_ns_ie_ip6_elem *ip6_elems; |
| 1255 | struct gprs_ns2_vc_bind *bind; |
| 1256 | struct gprs_ns2_inst *nsi = nse->nsi; |
Alexander Couzens | 9a4cf27 | 2020-10-11 20:48:04 +0200 | [diff] [blame] | 1257 | const struct osmo_sockaddr *sa; |
| 1258 | struct osmo_sockaddr local; |
| 1259 | |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1260 | gss->ip = remote->u.sa.sa_family == AF_INET ? IPv4 : IPv6; |
| 1261 | |
| 1262 | gss->initial = *remote; |
| 1263 | gss->sns_nsvc = nsvc; |
| 1264 | nsvc->sns_only = true; |
| 1265 | |
| 1266 | int count = 0; |
| 1267 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 1268 | if (!gprs_ns2_is_ip_bind(bind)) |
| 1269 | continue; |
| 1270 | |
| 1271 | sa = gprs_ns2_ip_bind_sockaddr(bind); |
| 1272 | if (!sa) |
| 1273 | continue; |
| 1274 | |
| 1275 | if (sa->u.sa.sa_family == remote->u.sa.sa_family) |
| 1276 | count++; |
| 1277 | } |
| 1278 | |
| 1279 | if (count == 0) { |
| 1280 | /* TODO: logging */ |
| 1281 | goto err; |
| 1282 | } |
| 1283 | |
| 1284 | switch (gss->ip) { |
| 1285 | case IPv4: |
| 1286 | ip4_elems = talloc_zero_size(fi, sizeof(struct gprs_ns_ie_ip4_elem) * count); |
| 1287 | if (!ip4_elems) |
| 1288 | goto err; |
| 1289 | |
| 1290 | gss->ip4_local = ip4_elems; |
| 1291 | |
| 1292 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 1293 | if (!gprs_ns2_is_ip_bind(bind)) |
| 1294 | continue; |
| 1295 | |
| 1296 | sa = gprs_ns2_ip_bind_sockaddr(bind); |
| 1297 | if (!sa) |
| 1298 | continue; |
| 1299 | |
| 1300 | if (sa->u.sas.ss_family != AF_INET) |
| 1301 | continue; |
| 1302 | |
| 1303 | /* check if this is an specific bind */ |
| 1304 | if (sa->u.sin.sin_addr.s_addr == 0) { |
| 1305 | if (osmo_sockaddr_local_ip(&local, remote)) |
| 1306 | continue; |
| 1307 | |
| 1308 | ip4_elems->ip_addr = local.u.sin.sin_addr.s_addr; |
| 1309 | } else { |
| 1310 | ip4_elems->ip_addr = sa->u.sin.sin_addr.s_addr; |
| 1311 | } |
| 1312 | |
| 1313 | ip4_elems->udp_port = sa->u.sin.sin_port; |
| 1314 | ip4_elems->sig_weight = 2; |
| 1315 | ip4_elems->data_weight = 1; |
| 1316 | ip4_elems++; |
| 1317 | } |
| 1318 | |
| 1319 | gss->num_ip4_local = count; |
| 1320 | gss->num_max_ip4_remote = 4; |
| 1321 | break; |
| 1322 | case IPv6: |
| 1323 | /* IPv6 */ |
| 1324 | ip6_elems = talloc_zero_size(fi, sizeof(struct gprs_ns_ie_ip6_elem) * count); |
| 1325 | if (!ip6_elems) |
| 1326 | goto err; |
| 1327 | |
| 1328 | gss->ip6_local = ip6_elems; |
| 1329 | |
| 1330 | llist_for_each_entry(bind, &nsi->binding, list) { |
| 1331 | if (!gprs_ns2_is_ip_bind(bind)) |
| 1332 | continue; |
| 1333 | |
| 1334 | sa = gprs_ns2_ip_bind_sockaddr(bind); |
| 1335 | if (!sa) |
| 1336 | continue; |
| 1337 | |
| 1338 | if (sa->u.sas.ss_family != AF_INET6) |
| 1339 | continue; |
| 1340 | |
| 1341 | /* check if this is an specific bind */ |
| 1342 | if (IN6_IS_ADDR_UNSPECIFIED(&sa->u.sin6.sin6_addr)) { |
| 1343 | if (osmo_sockaddr_local_ip(&local, remote)) |
| 1344 | continue; |
| 1345 | |
| 1346 | ip6_elems->ip_addr = local.u.sin6.sin6_addr; |
| 1347 | } else { |
| 1348 | ip6_elems->ip_addr = sa->u.sin6.sin6_addr; |
| 1349 | } |
| 1350 | |
| 1351 | ip6_elems->udp_port = sa->u.sin.sin_port; |
| 1352 | ip6_elems->sig_weight = 2; |
| 1353 | ip6_elems->data_weight = 1; |
| 1354 | |
| 1355 | ip6_elems++; |
| 1356 | } |
| 1357 | gss->num_ip6_local = count; |
| 1358 | gss->num_max_ip6_remote = 4; |
| 1359 | break; |
| 1360 | } |
| 1361 | |
| 1362 | gss->num_max_nsvcs = 8; |
| 1363 | |
| 1364 | return osmo_fsm_inst_dispatch(nse->bss_sns_fi, GPRS_SNS_EV_START, NULL); |
| 1365 | |
| 1366 | err: |
| 1367 | return -1; |
| 1368 | } |
| 1369 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1370 | /*! main entry point for receiving SNS messages from the network. |
| 1371 | * \param[in] nsvc NS-VC on which the message was received |
| 1372 | * \param[in] msg message buffer of the IP-SNS message |
| 1373 | * \param[in] tp parsed TLV structure of message |
| 1374 | * \retruns 0 on success; negative on error */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1375 | int gprs_ns2_sns_rx(struct gprs_ns2_vc *nsvc, struct msgb *msg, struct tlv_parsed *tp) |
| 1376 | { |
| 1377 | struct gprs_ns2_nse *nse = nsvc->nse; |
| 1378 | struct gprs_ns_hdr *nsh = (struct gprs_ns_hdr *) msg->l2h; |
| 1379 | uint16_t nsei = nsvc->nse->nsei; |
| 1380 | struct osmo_fsm_inst *fi; |
| 1381 | |
| 1382 | if (!nse->bss_sns_fi) { |
| 1383 | LOGP(DLNS, LOGL_NOTICE, "NSEI=%u Rx %s for NS Instance that has no SNS!\n", |
| 1384 | nsvc->nse->nsei, get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| 1385 | return -EINVAL; |
| 1386 | } |
| 1387 | |
| 1388 | LOGP(DLNS, LOGL_DEBUG, "NSEI=%u Rx SNS PDU type %s\n", nsei, |
| 1389 | get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| 1390 | |
| 1391 | /* FIXME: how to resolve SNS FSM Instance by NSEI (SGSN)? */ |
| 1392 | fi = nse->bss_sns_fi; |
| 1393 | |
| 1394 | switch (nsh->pdu_type) { |
| 1395 | case SNS_PDUT_SIZE: |
| 1396 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE, tp); |
| 1397 | break; |
| 1398 | case SNS_PDUT_SIZE_ACK: |
| 1399 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_SIZE_ACK, tp); |
| 1400 | break; |
| 1401 | case SNS_PDUT_CONFIG: |
| 1402 | if (nsh->data[0] & 0x01) |
| 1403 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_END, tp); |
| 1404 | else |
| 1405 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG, tp); |
| 1406 | break; |
| 1407 | case SNS_PDUT_CONFIG_ACK: |
| 1408 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CONFIG_ACK, tp); |
| 1409 | break; |
| 1410 | case SNS_PDUT_ADD: |
| 1411 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_ADD, tp); |
| 1412 | break; |
| 1413 | case SNS_PDUT_DELETE: |
| 1414 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_DELETE, tp); |
| 1415 | break; |
| 1416 | case SNS_PDUT_CHANGE_WEIGHT: |
| 1417 | osmo_fsm_inst_dispatch(fi, GPRS_SNS_EV_CHANGE_WEIGHT, tp); |
| 1418 | break; |
| 1419 | case SNS_PDUT_ACK: |
| 1420 | LOGP(DLNS, LOGL_NOTICE, "NSEI=%u Rx unsupported SNS PDU type %s\n", nsei, |
| 1421 | get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| 1422 | break; |
| 1423 | default: |
| 1424 | LOGP(DLNS, LOGL_ERROR, "NSEI=%u Rx unknown SNS PDU type %s\n", nsei, |
| 1425 | get_value_string(gprs_ns_pdu_strings, nsh->pdu_type)); |
| 1426 | return -EINVAL; |
| 1427 | } |
| 1428 | |
| 1429 | return 0; |
| 1430 | } |
| 1431 | |
| 1432 | #include <osmocom/vty/vty.h> |
| 1433 | #include <osmocom/vty/misc.h> |
| 1434 | |
| 1435 | static void vty_dump_sns_ip4(struct vty *vty, const struct gprs_ns_ie_ip4_elem *ip4) |
| 1436 | { |
| 1437 | struct in_addr in = { .s_addr = ip4->ip_addr }; |
| 1438 | vty_out(vty, " %s:%u, Signalling Weight: %u, Data Weight: %u%s", |
| 1439 | inet_ntoa(in), ntohs(ip4->udp_port), ip4->sig_weight, ip4->data_weight, VTY_NEWLINE); |
| 1440 | } |
| 1441 | |
| 1442 | static void vty_dump_sns_ip6(struct vty *vty, const struct gprs_ns_ie_ip6_elem *ip6) |
| 1443 | { |
| 1444 | char ip_addr[INET6_ADDRSTRLEN] = {}; |
| 1445 | if (!inet_ntop(AF_INET6, &ip6->ip_addr, ip_addr, (INET6_ADDRSTRLEN))) |
| 1446 | strcpy(ip_addr, "Invalid IPv6"); |
| 1447 | |
| 1448 | vty_out(vty, " %s:%u, Signalling Weight: %u, Data Weight: %u%s", |
| 1449 | ip_addr, ntohs(ip6->udp_port), ip6->sig_weight, ip6->data_weight, VTY_NEWLINE); |
| 1450 | } |
| 1451 | |
Harald Welte | 5bef2cc | 2020-09-18 22:33:24 +0200 | [diff] [blame] | 1452 | /*! Dump the IP-SNS state to a vty. |
| 1453 | * \param[in] vty VTY to which the state shall be printed |
| 1454 | * \param[in] nse NS Entity whose IP-SNS state shall be printed |
| 1455 | * \param[in] stats Whether or not statistics shall also be printed */ |
Alexander Couzens | 6a16149 | 2020-07-12 13:45:50 +0200 | [diff] [blame] | 1456 | void gprs_ns2_sns_dump_vty(struct vty *vty, const struct gprs_ns2_nse *nse, bool stats) |
| 1457 | { |
| 1458 | struct ns2_sns_state *gss; |
| 1459 | unsigned int i; |
| 1460 | |
| 1461 | if (!nse->bss_sns_fi) |
| 1462 | return; |
| 1463 | |
| 1464 | vty_out_fsm_inst(vty, nse->bss_sns_fi); |
| 1465 | gss = (struct ns2_sns_state *) nse->bss_sns_fi->priv; |
| 1466 | |
| 1467 | vty_out(vty, "Maximum number of remote NS-VCs: %zu, IPv4 Endpoints: %zu, IPv6 Endpoints: %zu%s", |
| 1468 | gss->num_max_nsvcs, gss->num_max_ip4_remote, gss->num_max_ip6_remote, VTY_NEWLINE); |
| 1469 | |
| 1470 | if (gss->num_ip4_local && gss->num_ip4_remote) { |
| 1471 | vty_out(vty, "Local IPv4 Endpoints:%s", VTY_NEWLINE); |
| 1472 | for (i = 0; i < gss->num_ip4_local; i++) |
| 1473 | vty_dump_sns_ip4(vty, &gss->ip4_local[i]); |
| 1474 | |
| 1475 | vty_out(vty, "Remote IPv4 Endpoints:%s", VTY_NEWLINE); |
| 1476 | for (i = 0; i < gss->num_ip4_remote; i++) |
| 1477 | vty_dump_sns_ip4(vty, &gss->ip4_remote[i]); |
| 1478 | } |
| 1479 | |
| 1480 | if (gss->num_ip6_local && gss->num_ip6_remote) { |
| 1481 | vty_out(vty, "Local IPv6 Endpoints:%s", VTY_NEWLINE); |
| 1482 | for (i = 0; i < gss->num_ip6_local; i++) |
| 1483 | vty_dump_sns_ip6(vty, &gss->ip6_local[i]); |
| 1484 | |
| 1485 | vty_out(vty, "Remote IPv6 Endpoints:%s", VTY_NEWLINE); |
| 1486 | for (i = 0; i < gss->num_ip6_remote; i++) |
| 1487 | vty_dump_sns_ip6(vty, &gss->ip6_remote[i]); |
| 1488 | } |
| 1489 | } |
| 1490 | |
| 1491 | /* initialize osmo_ctx on main tread */ |
| 1492 | static __attribute__((constructor)) void on_dso_load_ctx(void) |
| 1493 | { |
| 1494 | OSMO_ASSERT(osmo_fsm_register(&gprs_ns2_sns_bss_fsm) == 0); |
| 1495 | } |