Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 1 | #include <stdint.h> |
| 2 | #include <string.h> |
| 3 | #include <errno.h> |
| 4 | |
| 5 | #include <talloc.h> |
| 6 | |
| 7 | #include <osmocom/core/logging.h> |
| 8 | #include <osmocom/core/utils.h> |
| 9 | #include <osmocom/core/msgb.h> |
| 10 | #include <osmocom/core/fsm.h> |
| 11 | |
| 12 | #include <osmocom/abis/ipa.h> |
| 13 | #include <osmocom/gsm/protocol/ipaccess.h> |
| 14 | |
| 15 | #include "client.h" |
| 16 | #include "rspro_util.h" |
| 17 | |
| 18 | #define S(x) (1 << (x)) |
| 19 | |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame^] | 20 | #define T1_WAIT_CLIENT_CONN_RES 10 |
| 21 | #define T2_RECONNECT 10 |
| 22 | |
| 23 | /*********************************************************************** |
| 24 | * server connection FSM: remsim-{client,bankd} to remsim-server |
| 25 | ***********************************************************************/ |
| 26 | |
Harald Welte | 7f0e82f | 2018-10-14 20:07:59 +0200 | [diff] [blame] | 27 | static void push_and_send(struct ipa_client_conn *ipa, struct msgb *msg_tx) |
| 28 | { |
| 29 | ipa_prepend_header_ext(msg_tx, IPAC_PROTO_EXT_RSPRO); |
| 30 | ipa_msg_push_header(msg_tx, IPAC_PROTO_OSMO); |
| 31 | ipa_client_conn_send(ipa, msg_tx); |
| 32 | /* msg_tx is now queued and will be freed. */ |
| 33 | } |
| 34 | |
| 35 | void ipa_client_conn_send_rspro(struct ipa_client_conn *ipa, RsproPDU_t *rspro) |
| 36 | { |
| 37 | struct msgb *msg = rspro_enc_msg(rspro); |
| 38 | OSMO_ASSERT(msg); |
| 39 | push_and_send(ipa, msg); |
| 40 | } |
| 41 | |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 42 | enum server_conn_fsm_state { |
| 43 | /* waiting for initial connectiong to remsim-server */ |
| 44 | SRVC_ST_INIT, |
| 45 | /* server connection established, waiting for ClientConnectRes */ |
| 46 | SRVC_ST_ESTABLISHED, |
| 47 | /* server connection etsablished, ClientConnect succeeded */ |
| 48 | SRVC_ST_CONNECTED, |
| 49 | /* connection lost, we're waiting for a re-establish */ |
| 50 | SRVC_ST_REESTABLISH, |
| 51 | }; |
| 52 | |
| 53 | static const struct value_string server_conn_fsm_event_names[] = { |
| 54 | OSMO_VALUE_STRING(SRVC_E_TCP_UP), |
| 55 | OSMO_VALUE_STRING(SRVC_E_TCP_DOWN), |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 56 | OSMO_VALUE_STRING(SRVC_E_KA_TIMEOUT), |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 57 | OSMO_VALUE_STRING(SRVC_E_CLIENT_CONN_RES), |
| 58 | { 0, NULL } |
| 59 | }; |
| 60 | |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 61 | static void srvc_updown_cb(struct ipa_client_conn *conn, int up) |
| 62 | { |
| 63 | struct rspro_server_conn *srvc = conn->data; |
| 64 | |
| 65 | printf("RSPRO link to %s:%d %s\n", conn->addr, conn->port, up ? "UP" : "DOWN"); |
| 66 | |
| 67 | osmo_fsm_inst_dispatch(srvc->fi, up ? SRVC_E_TCP_UP: SRVC_E_TCP_DOWN, 0); |
| 68 | } |
| 69 | |
| 70 | static int srvc_read_cb(struct ipa_client_conn *conn, struct msgb *msg) |
| 71 | { |
| 72 | struct ipaccess_head *hh = (struct ipaccess_head *) msg->data; |
| 73 | struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg); |
| 74 | struct rspro_server_conn *srvc = conn->data; |
Harald Welte | f9995a3 | 2018-10-14 20:40:05 +0200 | [diff] [blame] | 75 | RsproPDU_t *pdu; |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 76 | int rc; |
| 77 | |
| 78 | if (msgb_length(msg) < sizeof(*hh)) |
| 79 | goto invalid; |
| 80 | msg->l2h = &hh->data[0]; |
Harald Welte | 1a17104 | 2019-03-08 19:18:52 +0100 | [diff] [blame] | 81 | switch (hh->proto) { |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 82 | case IPAC_PROTO_IPACCESS: |
| 83 | rc = ipaccess_bts_handle_ccm(srvc->conn, &srvc->ipa_dev, msg); |
| 84 | if (rc < 0) |
| 85 | break; |
| 86 | switch (hh->data[0]) { |
| 87 | case IPAC_MSGT_PONG: |
| 88 | ipa_keepalive_fsm_pong_received(srvc->keepalive_fi); |
| 89 | rc = 0; |
| 90 | break; |
| 91 | default: |
| 92 | break; |
| 93 | } |
| 94 | break; |
Harald Welte | 1a17104 | 2019-03-08 19:18:52 +0100 | [diff] [blame] | 95 | case IPAC_PROTO_OSMO: |
| 96 | if (!he || msgb_l2len(msg) < sizeof(*he)) |
| 97 | goto invalid; |
| 98 | msg->l2h = &he->data[0]; |
| 99 | switch (he->proto) { |
| 100 | case IPAC_PROTO_EXT_RSPRO: |
| 101 | printf("Received RSPRO %s\n", msgb_hexdump(msg)); |
| 102 | pdu = rspro_dec_msg(msg); |
| 103 | if (!pdu) |
| 104 | goto invalid; |
| 105 | rc = srvc->handle_rx(srvc, pdu); |
| 106 | ASN_STRUCT_FREE(asn_DEF_RsproPDU, pdu); |
| 107 | break; |
| 108 | default: |
| 109 | goto invalid; |
| 110 | } |
| 111 | break; |
| 112 | default: |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 113 | goto invalid; |
Harald Welte | 1a17104 | 2019-03-08 19:18:52 +0100 | [diff] [blame] | 114 | } |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 115 | |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 116 | return rc; |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 117 | |
| 118 | invalid: |
| 119 | msgb_free(msg); |
| 120 | return -1; |
| 121 | } |
| 122 | |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 123 | static const struct ipa_keepalive_params ka_params = { |
| 124 | .interval = 30, |
| 125 | .wait_for_resp = 10, |
| 126 | }; |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 127 | |
| 128 | static void srvc_st_init_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 129 | { |
| 130 | struct rspro_server_conn *srvc = (struct rspro_server_conn *) fi->priv; |
| 131 | int rc; |
| 132 | |
Harald Welte | 098ef87 | 2018-10-14 20:08:50 +0200 | [diff] [blame] | 133 | srvc->conn = ipa_client_conn_create(fi, NULL, 0, srvc->server_host, srvc->server_port, |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 134 | srvc_updown_cb, srvc_read_cb, NULL, srvc); |
| 135 | if (!srvc->conn) { |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 136 | LOGPFSM(fi, "Unable to create socket: %s\n", strerror(errno)); |
| 137 | goto out_fi; |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 138 | } |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 139 | |
| 140 | srvc->keepalive_fi = ipa_client_conn_alloc_keepalive_fsm(srvc->conn, &ka_params, fi->id); |
| 141 | if (!srvc->keepalive_fi) { |
| 142 | LOGPFSM(fi, "Unable to create keepalive FSM\n"); |
| 143 | goto out_conn; |
| 144 | } |
| 145 | /* ensure parent is notified once keepalive FSM instance is dying */ |
| 146 | osmo_fsm_inst_change_parent(srvc->keepalive_fi, srvc->fi, SRVC_E_KA_TIMEOUT); |
| 147 | |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 148 | /* Attempt to connect TCP socket */ |
| 149 | rc = ipa_client_conn_open(srvc->conn); |
| 150 | if (rc < 0) { |
| 151 | fprintf(stderr, "Unable to connect: %s\n", strerror(errno)); |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 152 | goto out_ka; |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 153 | } |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 154 | |
| 155 | return; |
| 156 | |
| 157 | out_ka: |
| 158 | osmo_fsm_inst_term(srvc->keepalive_fi, OSMO_FSM_TERM_ERROR, NULL); |
| 159 | out_conn: |
| 160 | ipa_client_conn_destroy(srvc->conn); |
| 161 | out_fi: |
| 162 | osmo_fsm_inst_term(fi, OSMO_FSM_TERM_ERROR, NULL); |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 163 | } |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 164 | |
| 165 | static void srvc_st_init(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 166 | { |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 167 | switch (event) { |
| 168 | case SRVC_E_TCP_UP: |
| 169 | osmo_fsm_inst_state_chg(fi, SRVC_ST_ESTABLISHED, T1_WAIT_CLIENT_CONN_RES, 1); |
| 170 | break; |
Harald Welte | 52cc7db | 2018-09-24 11:51:51 +0200 | [diff] [blame] | 171 | case SRVC_E_TCP_DOWN: |
| 172 | osmo_fsm_inst_state_chg(fi, SRVC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 173 | break; |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 174 | default: |
| 175 | OSMO_ASSERT(0); |
| 176 | } |
| 177 | } |
| 178 | |
| 179 | static void srvc_st_established_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 180 | { |
| 181 | struct rspro_server_conn *srvc = (struct rspro_server_conn *) fi->priv; |
| 182 | RsproPDU_t *pdu; |
| 183 | |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 184 | ipa_keepalive_fsm_start(srvc->keepalive_fi); |
| 185 | |
Harald Welte | 707c85a | 2019-03-09 12:56:35 +0100 | [diff] [blame^] | 186 | if (srvc->own_comp_id.type == ComponentType_remsimClient) |
| 187 | pdu = rspro_gen_ConnectClientReq(&srvc->own_comp_id, srvc->clslot); |
| 188 | else |
| 189 | pdu = rspro_gen_ConnectBankReq(&srvc->own_comp_id, 1, 8 /* FIXME */); |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 190 | ipa_client_conn_send_rspro(srvc->conn, pdu); |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 191 | } |
| 192 | |
| 193 | static void srvc_st_established(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 194 | { |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 195 | switch (event) { |
| 196 | case SRVC_E_TCP_DOWN: |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 197 | case SRVC_E_KA_TIMEOUT: |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 198 | osmo_fsm_inst_state_chg(fi, SRVC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 199 | break; |
| 200 | case SRVC_E_CLIENT_CONN_RES: |
| 201 | /* somehow notify the main code? */ |
| 202 | osmo_fsm_inst_state_chg(fi, SRVC_ST_CONNECTED, 0, 0); |
| 203 | break; |
| 204 | default: |
| 205 | OSMO_ASSERT(0); |
| 206 | } |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static void srvc_st_connected(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 210 | { |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 211 | switch (event) { |
| 212 | case SRVC_E_TCP_DOWN: |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 213 | case SRVC_E_KA_TIMEOUT: |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 214 | osmo_fsm_inst_state_chg(fi, SRVC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 215 | break; |
| 216 | default: |
| 217 | OSMO_ASSERT(0); |
| 218 | } |
| 219 | } |
| 220 | |
| 221 | static void srvc_st_reestablish_onenter(struct osmo_fsm_inst *fi, uint32_t prev_state) |
| 222 | { |
| 223 | struct rspro_server_conn *srvc = (struct rspro_server_conn *) fi->priv; |
| 224 | int rc; |
| 225 | |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 226 | ipa_keepalive_fsm_stop(srvc->keepalive_fi); |
| 227 | |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 228 | /* Attempt to connect TCP socket */ |
| 229 | rc = ipa_client_conn_open(srvc->conn); |
| 230 | if (rc < 0) { |
| 231 | fprintf(stderr, "Unable to connect RSPRO to %s:%d - %s\n", |
| 232 | srvc->server_host, srvc->server_port, strerror(errno)); |
| 233 | /* FIXME: retry? Timer? Abort? */ |
| 234 | OSMO_ASSERT(0); |
| 235 | } |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 236 | } |
| 237 | |
| 238 | static void srvc_st_reestablish(struct osmo_fsm_inst *fi, uint32_t event, void *data) |
| 239 | { |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 240 | switch (event) { |
Harald Welte | 52cc7db | 2018-09-24 11:51:51 +0200 | [diff] [blame] | 241 | case SRVC_E_TCP_UP: |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 242 | osmo_fsm_inst_state_chg(fi, SRVC_ST_ESTABLISHED, T1_WAIT_CLIENT_CONN_RES, 1); |
| 243 | break; |
Harald Welte | 52cc7db | 2018-09-24 11:51:51 +0200 | [diff] [blame] | 244 | case SRVC_E_TCP_DOWN: |
| 245 | /* wait for normal T2 call-back */ |
| 246 | break; |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 247 | default: |
| 248 | OSMO_ASSERT(0); |
| 249 | } |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | static int server_conn_fsm_timer_cb(struct osmo_fsm_inst *fi) |
| 253 | { |
Harald Welte | 52cc7db | 2018-09-24 11:51:51 +0200 | [diff] [blame] | 254 | switch (fi->T) { |
| 255 | case 2: |
| 256 | osmo_fsm_inst_state_chg(fi, SRVC_ST_REESTABLISH, T2_RECONNECT, 2); |
| 257 | break; |
| 258 | case 1: |
| 259 | /* FIXME: close connection and re-start connection attempt */ |
| 260 | break; |
| 261 | default: |
| 262 | OSMO_ASSERT(0); |
| 263 | } |
| 264 | |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 265 | return 0; |
| 266 | } |
| 267 | |
| 268 | static const struct osmo_fsm_state server_conn_fsm_states[] = { |
| 269 | [SRVC_ST_INIT] = { |
| 270 | .name = "INIT", |
Harald Welte | 52cc7db | 2018-09-24 11:51:51 +0200 | [diff] [blame] | 271 | .in_event_mask = S(SRVC_E_TCP_UP) | S(SRVC_E_TCP_DOWN), |
| 272 | .out_state_mask = S(SRVC_ST_ESTABLISHED) | S(SRVC_ST_REESTABLISH), |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 273 | .action = srvc_st_init, |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 274 | .onenter = srvc_st_init_onenter, |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 275 | }, |
| 276 | [SRVC_ST_ESTABLISHED] = { |
| 277 | .name = "ESTABLISHED", |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 278 | .in_event_mask = S(SRVC_E_TCP_DOWN) | S(SRVC_E_KA_TIMEOUT) | S(SRVC_E_CLIENT_CONN_RES), |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 279 | .out_state_mask = S(SRVC_ST_CONNECTED) | S(SRVC_ST_REESTABLISH), |
| 280 | .action = srvc_st_established, |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 281 | .onenter = srvc_st_established_onenter, |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 282 | }, |
| 283 | [SRVC_ST_CONNECTED] = { |
| 284 | .name = "CONNECTED", |
Harald Welte | 03b2411 | 2019-03-08 19:43:02 +0100 | [diff] [blame] | 285 | .in_event_mask = S(SRVC_E_TCP_DOWN) | S(SRVC_E_KA_TIMEOUT), |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 286 | .out_state_mask = S(SRVC_ST_REESTABLISH), |
| 287 | .action = srvc_st_connected, |
| 288 | }, |
| 289 | [SRVC_ST_REESTABLISH] = { |
| 290 | .name = "REESTABLISH", |
Harald Welte | 52cc7db | 2018-09-24 11:51:51 +0200 | [diff] [blame] | 291 | .in_event_mask = S(SRVC_E_TCP_UP) | S(SRVC_E_TCP_DOWN), |
| 292 | .out_state_mask = S(SRVC_ST_ESTABLISHED) | S(SRVC_ST_REESTABLISH), |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 293 | .action = srvc_st_reestablish, |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 294 | .onenter = srvc_st_reestablish_onenter, |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 295 | }, |
| 296 | }; |
| 297 | |
| 298 | struct osmo_fsm remsim_client_server_fsm = { |
| 299 | .name = "SERVER_CONN", |
| 300 | .states = server_conn_fsm_states, |
| 301 | .num_states = ARRAY_SIZE(server_conn_fsm_states), |
| 302 | .timer_cb = server_conn_fsm_timer_cb, |
| 303 | .log_subsys = DMAIN, |
| 304 | .event_names = server_conn_fsm_event_names, |
| 305 | }; |
| 306 | |
Harald Welte | 098ef87 | 2018-10-14 20:08:50 +0200 | [diff] [blame] | 307 | int server_conn_fsm_alloc(void *ctx, struct rspro_server_conn *srvc) |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 308 | { |
| 309 | struct osmo_fsm_inst *fi; |
| 310 | |
Harald Welte | 098ef87 | 2018-10-14 20:08:50 +0200 | [diff] [blame] | 311 | fi = osmo_fsm_inst_alloc(&remsim_client_server_fsm, ctx, srvc, LOGL_DEBUG, "server"); |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 312 | if (!fi) |
| 313 | return -1; |
| 314 | |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 315 | srvc->fi = fi; |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 316 | /* onenter of the initial state is not automatically executed by osmo_fsm :( */ |
Harald Welte | 84ba234 | 2018-08-24 22:20:20 +0200 | [diff] [blame] | 317 | srvc_st_init_onenter(fi, 0); |
Harald Welte | 24173fb | 2018-08-24 20:37:28 +0200 | [diff] [blame] | 318 | return 0; |
| 319 | } |
Harald Welte | 7fc64bc | 2019-03-02 12:55:59 +0100 | [diff] [blame] | 320 | |
| 321 | static __attribute__((constructor)) void on_dso_load(void) |
| 322 | { |
Harald Welte | 7fc64bc | 2019-03-02 12:55:59 +0100 | [diff] [blame] | 323 | osmo_fsm_register(&remsim_client_server_fsm); |
| 324 | } |