/* * (C) 2018 by Vadim Yanitskiy * * All Rights Reserved * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License as published by * the Free Software Foundation; either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see . * */ #include #include #include #include #include #include #include #include #include #include #include /* Common helper for preparing to be encoded GSUP message */ static void gsup_sm_msg_init(struct osmo_gsup_message *gsup_msg, enum osmo_gsup_message_type msg_type, const char *imsi, uint8_t *sm_rp_mr) { /* Init a mew GSUP message */ memset(gsup_msg, 0x00, sizeof(*gsup_msg)); gsup_msg->message_type = msg_type; /* SM-RP-MR (Message Reference) */ gsup_msg->sm_rp_mr = sm_rp_mr; /* Fill in subscriber's IMSI */ OSMO_STRLCPY_ARRAY(gsup_msg->imsi, imsi); } int gsm411_gsup_mo_fwd_sm_req(struct gsm_trans *trans, struct msgb *msg, uint8_t sm_rp_mr, uint8_t *sm_rp_da, uint8_t sm_rp_da_len) { uint8_t bcd_buf[GSM48_MI_SIZE] = { 0 }; struct osmo_gsup_message gsup_msg; size_t bcd_len; /* Associate logging messages with this subscriber */ log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub); LOGP(DLSMS, LOGL_DEBUG, "TX GSUP MO-forwardSM-Req\n"); /* Assign SM-RP-MR to transaction state */ trans->sms.sm_rp_mr = sm_rp_mr; /* Encode subscriber's MSISDN */ bcd_len = gsm48_encode_bcd_number(bcd_buf, sizeof(bcd_buf), 0, trans->vsub->msisdn); if (bcd_len <= 0 || bcd_len > sizeof(bcd_buf)) { LOGP(DLSMS, LOGL_ERROR, "Failed to encode subscriber's MSISDN\n"); return -EINVAL; } /* Initialize a new GSUP message */ gsup_sm_msg_init(&gsup_msg, OSMO_GSUP_MSGT_MO_FORWARD_SM_REQUEST, trans->vsub->imsi, &sm_rp_mr); /* According to 12.2.3, the MSISDN from VLR is inserted here */ gsup_msg.sm_rp_oa_type = OSMO_GSUP_SMS_SM_RP_ODA_MSISDN; gsup_msg.sm_rp_oa_len = bcd_len; gsup_msg.sm_rp_oa = bcd_buf; /* SM-RP-DA should (already) contain SMSC address */ gsup_msg.sm_rp_da_type = OSMO_GSUP_SMS_SM_RP_ODA_SMSC_ADDR; gsup_msg.sm_rp_da_len = sm_rp_da_len; gsup_msg.sm_rp_da = sm_rp_da; /* SM-RP-UI (TPDU) is pointed by msgb->l4h */ gsup_msg.sm_rp_ui_len = msgb_l4len(msg); gsup_msg.sm_rp_ui = (uint8_t *) msgb_sms(msg); return osmo_gsup_client_enc_send(trans->net->vlr->gsup_client, &gsup_msg); } int gsm411_gsup_mo_ready_for_sm_req(struct gsm_trans *trans, uint8_t sm_rp_mr) { struct osmo_gsup_message gsup_msg; /* Associate logging messages with this subscriber */ log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub); LOGP(DLSMS, LOGL_DEBUG, "TX GSUP READY-FOR-SM Req\n"); /* Assign SM-RP-MR to transaction state */ trans->sms.sm_rp_mr = sm_rp_mr; /* Initialize a new GSUP message */ gsup_sm_msg_init(&gsup_msg, OSMO_GSUP_MSGT_READY_FOR_SM_REQUEST, trans->vsub->imsi, &sm_rp_mr); /* Indicate SMMA as the Alert Reason */ gsup_msg.sm_alert_rsn = OSMO_GSUP_SMS_SM_ALERT_RSN_MEM_AVAIL; return osmo_gsup_client_enc_send(trans->net->vlr->gsup_client, &gsup_msg); } /* Triggers either RP-ACK or RP-ERROR on response from SMSC */ int gsm411_gsup_mo_handler(struct vlr_subscr *vsub, struct osmo_gsup_message *gsup_msg) { struct vlr_instance *vlr; struct gsm_network *net; struct gsm_trans *trans; const char *msg_name; bool msg_is_err; /* Obtain required pointers */ vlr = vsub->vlr; net = (struct gsm_network *) vlr->user_ctx; /* Associate logging messages with this subscriber */ log_set_context(LOG_CTX_VLR_SUBSCR, vsub); /* Determine the message type and name */ msg_is_err = OSMO_GSUP_IS_MSGT_ERROR(gsup_msg->message_type); switch (gsup_msg->message_type) { case OSMO_GSUP_MSGT_MO_FORWARD_SM_ERROR: case OSMO_GSUP_MSGT_MO_FORWARD_SM_RESULT: msg_name = "MO-forwardSM"; break; case OSMO_GSUP_MSGT_READY_FOR_SM_ERROR: case OSMO_GSUP_MSGT_READY_FOR_SM_RESULT: msg_name = "MO-ReadyForSM"; break; default: /* Shall not happen */ OSMO_ASSERT(0); } LOGP(DLSMS, LOGL_DEBUG, "RX %s-%s\n", msg_name, msg_is_err ? "Err" : "Res"); /* Make sure that 'SMS over GSUP' is expected */ if (!net->sms_over_gsup) { /* TODO: notify sender about that? */ LOGP(DLSMS, LOGL_NOTICE, "Unexpected MO SMS over GSUP, " "ignoring message...\n"); return -EIO; } /* Verify GSUP message */ if (!gsup_msg->sm_rp_mr) goto msg_error; if (msg_is_err && !gsup_msg->sm_rp_cause) goto msg_error; /* Attempt to find DTAP-transaction */ trans = trans_find_by_sm_rp_mr(net, vsub, *(gsup_msg->sm_rp_mr)); if (!trans) { LOGP(DLSMS, LOGL_NOTICE, "No transaction found for %s, " "ignoring %s-%s message...\n", vlr_subscr_name(vsub), msg_name, msg_is_err ? "Err" : "Res"); return -EIO; /* TODO: notify sender about that? */ } /* Send either RP-ERROR, or RP-ACK */ if (msg_is_err) { /* TODO: handle optional SM-RP-UI payload (requires API change) */ gsm411_send_rp_error(trans, *(gsup_msg->sm_rp_mr), *(gsup_msg->sm_rp_cause)); } else { gsm411_send_rp_ack(trans, *(gsup_msg->sm_rp_mr)); } return 0; msg_error: /* TODO: notify sender about that? */ LOGP(DLSMS, LOGL_NOTICE, "RX malformed %s-%s\n", msg_name, msg_is_err ? "Err" : "Res"); return -EINVAL; } int gsm411_gsup_mt_fwd_sm_res(struct gsm_trans *trans, uint8_t sm_rp_mr) { struct osmo_gsup_message gsup_msg; /* Associate logging messages with this subscriber */ log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub); LOGP(DLSMS, LOGL_DEBUG, "TX MT-forwardSM-Res\n"); /* Initialize a new GSUP message */ gsup_sm_msg_init(&gsup_msg, OSMO_GSUP_MSGT_MT_FORWARD_SM_RESULT, trans->vsub->imsi, &sm_rp_mr); return osmo_gsup_client_enc_send(trans->net->vlr->gsup_client, &gsup_msg); } int gsm411_gsup_mt_fwd_sm_err(struct gsm_trans *trans, uint8_t sm_rp_mr, uint8_t cause) { struct osmo_gsup_message gsup_msg; /* Associate logging messages with this subscriber */ log_set_context(LOG_CTX_VLR_SUBSCR, trans->vsub); LOGP(DLSMS, LOGL_DEBUG, "TX MT-forwardSM-Err\n"); /* Initialize a new GSUP message */ gsup_sm_msg_init(&gsup_msg, OSMO_GSUP_MSGT_MT_FORWARD_SM_ERROR, trans->vsub->imsi, &sm_rp_mr); /* SM-RP-Cause value */ gsup_msg.sm_rp_cause = &cause; /* TODO: include optional SM-RP-UI field if present */ return osmo_gsup_client_enc_send(trans->net->vlr->gsup_client, &gsup_msg); } /* Handles MT SMS (and triggers Paging Request if required) */ int gsm411_gsup_mt_handler(struct vlr_subscr *vsub, struct osmo_gsup_message *gsup_msg) { struct vlr_instance *vlr; struct gsm_network *net; int rc; /* Obtain required pointers */ vlr = vsub->vlr; net = (struct gsm_network *) vlr->user_ctx; /* Associate logging messages with this subscriber */ log_set_context(LOG_CTX_VLR_SUBSCR, vsub); LOGP(DLSMS, LOGL_DEBUG, "RX MT-forwardSM-Req\n"); /* Make sure that 'SMS over GSUP' is expected */ if (!net->sms_over_gsup) { LOGP(DLSMS, LOGL_NOTICE, "Unexpected MT SMS over GSUP, " "ignoring message...\n"); /* TODO: notify sender about that? */ return -EIO; } /** * Verify GSUP message * * FIXME: SM-RP-MR is not known yet (to be assigned by MSC) * NOTE: SM-RP-DA is out of our interest */ if (!gsup_msg->sm_rp_mr) goto msg_error; if (!gsup_msg->sm_rp_ui) goto msg_error; /* SM-RP-OA shall contain SMSC address */ if (gsup_msg->sm_rp_oa_type != OSMO_GSUP_SMS_SM_RP_ODA_SMSC_ADDR) goto msg_error; /* Send RP-DATA */ rc = gsm411_send_rp_data(net, vsub, gsup_msg->sm_rp_oa_len, gsup_msg->sm_rp_oa, gsup_msg->sm_rp_ui_len, gsup_msg->sm_rp_ui); if (rc) { LOGP(DLSMS, LOGL_NOTICE, "Failed to send MT SMS, " "ignoring MT-forwardSM-Req message...\n"); /* TODO: notify sender about that? */ return rc; } return 0; msg_error: /* TODO: notify sender about that? */ LOGP(DLSMS, LOGL_NOTICE, "RX malformed MT-forwardSM-Req\n"); return -EINVAL; }