Harald Welte | 3dcdd20 | 2019-03-09 13:06:46 +0100 | [diff] [blame] | 1 | /* (C) 2018-2019 by Harald Welte <laforge@gnumonks.org> |
| 2 | * |
| 3 | * All Rights Reserved |
| 4 | * |
| 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License along |
| 18 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 19 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | */ |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 22 | #include <stdint.h> |
| 23 | #include <string.h> |
| 24 | #include <errno.h> |
| 25 | |
| 26 | #include <talloc.h> |
| 27 | |
| 28 | #include <osmocom/core/logging.h> |
| 29 | #include <osmocom/core/utils.h> |
| 30 | #include <osmocom/core/msgb.h> |
| 31 | #include <osmocom/core/fsm.h> |
| 32 | |
| 33 | #include <osmocom/abis/ipa.h> |
| 34 | #include <osmocom/gsm/protocol/ipaccess.h> |
| 35 | |
| 36 | #include "client.h" |
| 37 | #include "rspro_util.h" |
| 38 | |
| 39 | #define S(x) (1 << (x)) |
| 40 | |
| 41 | static void bankd_updown_cb(struct ipa_client_conn *conn, int up) |
| 42 | { |
| 43 | struct bankd_client *bc = conn->data; |
| 44 | |
| 45 | printf("RSPRO link to %s:%d %s\n", conn->addr, conn->port, up ? "UP" : "DOWN"); |
| 46 | |
| 47 | osmo_fsm_inst_dispatch(bc->bankd_fi, up ? BDC_E_TCP_UP: BDC_E_TCP_DOWN, 0); |
| 48 | } |
| 49 | |
Harald Welte | 2f89b96 | 2019-03-30 08:58:40 +0100 | [diff] [blame] | 50 | /* internal function, bypassing FSM state */ |
| 51 | static int _bankd_conn_send_rspro(struct bankd_client *bc, RsproPDU_t *rspro) |
Harald Welte | a844bb0 | 2019-03-09 13:38:50 +0100 | [diff] [blame] | 52 | { |
| 53 | return ipa_client_conn_send_rspro(bc->bankd_conn, rspro); |
| 54 | } |
| 55 | |
Harald Welte | 2f89b96 | 2019-03-30 08:58:40 +0100 | [diff] [blame] | 56 | int bankd_conn_send_rspro(struct bankd_client *bc, RsproPDU_t *rspro) |
| 57 | { |
| 58 | if (osmo_fsm_inst_dispatch(bc->bankd_fi, BDC_E_RSPRO_TX, rspro) < 0) { |
| 59 | ASN_STRUCT_FREE(asn_DEF_RsproPDU, rspro); |
| 60 | return -1; |
| 61 | } |
| 62 | return 0; |
| 63 | } |
| 64 | |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 65 | /*********************************************************************** |
Harald Welte | 0a68497 | 2019-12-02 20:10:59 +0100 | [diff] [blame] | 66 | * client-side FSM for RSPRO connection to remsim-bankd |
| 67 | * |
| 68 | * This is part of remsim-client and manages the connection to remsim-bankd, |
| 69 | * over which actual TPDU exchanges happen. |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 70 | ***********************************************************************/ |
| 71 | |
| 72 | enum bankd_conn_fsm_state { |
Harald Welte | 0a68497 | 2019-12-02 20:10:59 +0100 | [diff] [blame] | 73 | /* waiting for initial connection to remsim-bankd */ |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 74 | BDC_ST_INIT, |
| 75 | /* bankd connection established, waiting for ClientConnectRes */ |
| 76 | BDC_ST_ESTABLISHED, |
Harald Welte | 0a68497 | 2019-12-02 20:10:59 +0100 | [diff] [blame] | 77 | /* bankd connection established, ClientConnect succeeded */ |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 78 | BDC_ST_CONNECTED, |
| 79 | /* connection lost, we're waiting for a re-establish */ |
| 80 | BDC_ST_REESTABLISH, |
| 81 | }; |
| 82 | |
| 83 | static const struct value_string remsim_client_bankd_fsm_event_names[] = { |
| 84 | OSMO_VALUE_STRING(BDC_E_ESTABLISH), |
| 85 | OSMO_VALUE_STRING(BDC_E_TCP_UP), |
| 86 | OSMO_VALUE_STRING(BDC_E_TCP_DOWN), |
| 87 | OSMO_VALUE_STRING(BDC_E_CLIENT_CONN_RES), |
Harald Welte | 2f89b96 | 2019-03-30 08:58:40 +0100 | [diff] [blame] | 88 | OSMO_VALUE_STRING(BDC_E_RSPRO_TX), |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 89 | { 0, NULL } |
| 90 | }; |
| 91 | |
| 92 | #define T1_WAIT_CLIENT_CONN_RES 10 |
| 93 | #define T2_RECONNECT 10 |
| 94 | |
| 95 | |
| 96 | static void bdc_st_init(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 97 | { |
| 98 | switch (event) { |
| 99 | case BDC_E_ESTABLISH: |
| 100 | osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 101 | break; |
| 102 | default: |
| 103 | OSMO_ASSERT(0); |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | static void bdc_st_established_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 108 | { |
| 109 | struct bankd_client *bc = (struct bankd_client *) fi->priv; |
| 110 | RsproPDU_t *pdu; |
| 111 | |
Harald Welte | f511667 | 2019-04-02 20:55:06 +0200 | [diff] [blame] | 112 | /* Send ClientConnReq */ |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 113 | pdu = rspro_gen_ConnectClientReq(&bc->srv_conn.own_comp_id, bc->srv_conn.clslot); |
Harald Welte | 2f89b96 | 2019-03-30 08:58:40 +0100 | [diff] [blame] | 114 | _bankd_conn_send_rspro(bc, pdu); |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | static void bdc_st_established(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 118 | { |
| 119 | switch (event) { |
| 120 | case BDC_E_TCP_DOWN: |
| 121 | osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 122 | break; |
| 123 | case BDC_E_CLIENT_CONN_RES: |
| 124 | /* somehow notify the main code? */ |
| 125 | osmo_fsm_inst_state_chg(fi, BDC_ST_CONNECTED, 0, 0); |
| 126 | break; |
| 127 | default: |
| 128 | OSMO_ASSERT(0); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | static void bdc_st_connected(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 133 | { |
Harald Welte | 2f89b96 | 2019-03-30 08:58:40 +0100 | [diff] [blame] | 134 | struct bankd_client *bc = (struct bankd_client *) fi->priv; |
| 135 | RsproPDU_t *pdu = NULL; |
| 136 | |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 137 | switch (event) { |
| 138 | case BDC_E_TCP_DOWN: |
| 139 | osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 140 | break; |
Harald Welte | 2f89b96 | 2019-03-30 08:58:40 +0100 | [diff] [blame] | 141 | case BDC_E_RSPRO_TX: |
| 142 | pdu = data; |
| 143 | _bankd_conn_send_rspro(bc, pdu); |
| 144 | break; |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 145 | default: |
| 146 | OSMO_ASSERT(0); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | static void bdc_st_reestablish_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 151 | { |
| 152 | struct bankd_client *bc = (struct bankd_client *) fi->priv; |
| 153 | int rc; |
| 154 | |
| 155 | /* re-create bankd_conn */ |
| 156 | if (bc->bankd_conn) { |
| 157 | LOGPFSML(fi, LOGL_INFO, "Destroying existing connection to bankd\n"); |
Harald Welte | 13ebf43 | 2019-11-07 13:00:39 +0100 | [diff] [blame] | 158 | ipa_client_conn_close(bc->bankd_conn); |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 159 | ipa_client_conn_destroy(bc->bankd_conn); |
| 160 | bc->bankd_conn = NULL; |
| 161 | } |
| 162 | LOGPFSML(fi, LOGL_INFO, "Creating TCP connection to bankd at %s:%u\n", |
| 163 | bc->bankd_host, bc->bankd_port); |
| 164 | bc->bankd_conn = ipa_client_conn_create(bc, NULL, 0, bc->bankd_host, bc->bankd_port, |
| 165 | bankd_updown_cb, bankd_read_cb, NULL, bc); |
| 166 | if (!bc->bankd_conn) { |
| 167 | fprintf(stderr, "Unable to create socket: %s\n", strerror(errno)); |
| 168 | exit(1); |
| 169 | } |
| 170 | |
| 171 | /* Attempt to connect TCP socket */ |
| 172 | rc = ipa_client_conn_open(bc->bankd_conn); |
| 173 | if (rc < 0) { |
| 174 | fprintf(stderr, "Unable to connect RSPRO to %s:%d - %s\n", |
| 175 | bc->bankd_conn->addr, bc->bankd_conn->port, strerror(errno)); |
| 176 | /* FIXME: retry? Timer? Abort? */ |
| 177 | OSMO_ASSERT(0); |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | static void bdc_st_reestablish(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 182 | { |
| 183 | switch (event) { |
| 184 | case BDC_E_TCP_UP: |
| 185 | osmo_fsm_inst_state_chg(fi, BDC_ST_ESTABLISHED, T1_WAIT_CLIENT_CONN_RES, 1); |
| 186 | break; |
| 187 | case BDC_E_TCP_DOWN: |
| 188 | /* wait for normal T2 timeout */ |
| 189 | break; |
| 190 | default: |
| 191 | OSMO_ASSERT(0); |
| 192 | } |
| 193 | } |
| 194 | |
| 195 | static void bdc_allstate_action(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 196 | { |
| 197 | switch (event) { |
Harald Welte | 75f5603 | 2019-03-17 09:35:41 +0100 | [diff] [blame] | 198 | case BDC_E_ESTABLISH: |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 199 | osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 200 | break; |
| 201 | default: |
| 202 | OSMO_ASSERT(0); |
| 203 | } |
| 204 | } |
| 205 | |
| 206 | static int remsim_client_bankd_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| 207 | { |
| 208 | switch (fi->T) { |
| 209 | case 2: |
| 210 | /* TCP reconnect failed: retry */ |
| 211 | osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 212 | break; |
| 213 | case 1: |
| 214 | /* no ClientConnectRes received: disconnect + reconnect */ |
| 215 | osmo_fsm_inst_state_chg(fi, BDC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 216 | break; |
| 217 | default: |
| 218 | OSMO_ASSERT(0); |
| 219 | } |
| 220 | return 0; |
| 221 | } |
| 222 | |
| 223 | static const struct osmo_fsm_state bankd_conn_fsm_states[] = { |
| 224 | [BDC_ST_INIT] = { |
| 225 | .name = "INIT", |
| 226 | .in_event_mask = 0, /* S(BDC_E_ESTABLISH) via allstate */ |
| 227 | .out_state_mask = S(BDC_ST_REESTABLISH), |
| 228 | .action = bdc_st_init, |
| 229 | }, |
| 230 | [BDC_ST_ESTABLISHED] = { |
| 231 | .name = "ESTABLISHED", |
| 232 | .in_event_mask = S(BDC_E_TCP_DOWN) | S(BDC_E_CLIENT_CONN_RES), |
| 233 | .out_state_mask = S(BDC_ST_CONNECTED) | S(BDC_ST_REESTABLISH), |
| 234 | .action = bdc_st_established, |
| 235 | .onenter = bdc_st_established_onenter, |
| 236 | }, |
| 237 | [BDC_ST_CONNECTED] = { |
| 238 | .name = "CONNECTED", |
Harald Welte | 2f89b96 | 2019-03-30 08:58:40 +0100 | [diff] [blame] | 239 | .in_event_mask = S(BDC_E_TCP_DOWN) | S(BDC_E_RSPRO_TX), |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 240 | .out_state_mask = S(BDC_ST_REESTABLISH), |
| 241 | .action = bdc_st_connected, |
| 242 | }, |
| 243 | [BDC_ST_REESTABLISH] = { |
| 244 | .name = "REESTABLISH", |
| 245 | .in_event_mask = S(BDC_E_TCP_UP) | S(BDC_E_TCP_DOWN), |
| 246 | .out_state_mask = S(BDC_ST_ESTABLISHED) | S(BDC_ST_REESTABLISH), |
| 247 | .action = bdc_st_reestablish, |
| 248 | .onenter = bdc_st_reestablish_onenter, |
| 249 | }, |
| 250 | }; |
| 251 | |
| 252 | struct osmo_fsm remsim_client_bankd_fsm = { |
| 253 | .name = "BANKD_CONN", |
| 254 | .states = bankd_conn_fsm_states, |
| 255 | .num_states = ARRAY_SIZE(bankd_conn_fsm_states), |
| 256 | .allstate_event_mask = S(BDC_E_ESTABLISH), |
| 257 | .allstate_action = bdc_allstate_action, |
| 258 | .timer_cb = remsim_client_bankd_fsm_timer_cb, |
| 259 | .log_subsys = DMAIN, |
| 260 | .event_names = remsim_client_bankd_fsm_event_names, |
| 261 | }; |
| 262 | |
| 263 | int bankd_conn_fsm_alloc(struct bankd_client *bc) |
| 264 | { |
| 265 | struct osmo_fsm_inst *fi; |
| 266 | |
| 267 | fi = osmo_fsm_inst_alloc(&remsim_client_bankd_fsm, bc, bc, LOGL_DEBUG, "bankd"); |
| 268 | if (!fi) |
| 269 | return -1; |
| 270 | |
| 271 | bc->bankd_fi = fi; |
| 272 | return 0; |
| 273 | } |
| 274 | |
| 275 | static __attribute__((constructor)) void on_dso_load(void) |
| 276 | { |
Harald Welte | 4ccd2fc | 2019-12-01 13:32:54 +0100 | [diff] [blame] | 277 | OSMO_ASSERT(osmo_fsm_register(&remsim_client_bankd_fsm) == 0); |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame] | 278 | } |