diff options
author | Neels Hofmeyr <neels@hofmeyr.de> | 2017-07-09 22:09:18 +0200 |
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committer | Neels Hofmeyr <neels@hofmeyr.de> | 2017-08-30 14:11:25 +0200 |
commit | 7b656884cfadfd8c56355e8a6c690721827b5b30 (patch) | |
tree | 7f3357a94992d953021a28ec20336c4578f23052 /src/libmsc/a_iface_bssap.c | |
parent | 31a11aa75b5aad8887213bcd88cddc1b79b5954f (diff) |
split off osmo-bsc: remove files, apply build
Change-Id: I64d84c52f6e38e98144eb9be8f0ab82e0e1f6cca
Diffstat (limited to 'src/libmsc/a_iface_bssap.c')
-rw-r--r-- | src/libmsc/a_iface_bssap.c | 716 |
1 files changed, 0 insertions, 716 deletions
diff --git a/src/libmsc/a_iface_bssap.c b/src/libmsc/a_iface_bssap.c deleted file mode 100644 index e8a229374..000000000 --- a/src/libmsc/a_iface_bssap.c +++ /dev/null @@ -1,716 +0,0 @@ -/* (C) 2017 by Sysmocom s.f.m.c. GmbH - * All Rights Reserved - * - * Author: Philipp Maier - * - * 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 <http://www.gnu.org/licenses/>. - * - */ - -#include <osmocom/core/utils.h> -#include <osmocom/core/msgb.h> -#include <osmocom/core/logging.h> -#include <osmocom/sigtran/sccp_helpers.h> -#include <osmocom/sccp/sccp_types.h> -#include <osmocom/gsm/gsm0808.h> -#include <osmocom/gsm/gsm0808_utils.h> -#include <openbsc/debug.h> -#include <openbsc/gsm_data.h> -#include <openbsc/a_iface_bssap.h> -#include <openbsc/a_iface.h> -#include <openbsc/osmo_msc.h> -#include <osmocom/core/byteswap.h> -#include <openbsc/a_reset.h> - -#define IP_V4_ADDR_LEN 4 - -/* - * Helper functions to lookup and allocate subscribers - */ - -/* Allocate a new subscriber connection */ -static struct gsm_subscriber_connection *subscr_conn_allocate_a(const struct a_conn_info *a_conn_info, - struct gsm_network *network, - uint16_t lac, struct osmo_sccp_user *scu, int conn_id) -{ - struct gsm_subscriber_connection *conn; - - LOGP(DMSC, LOGL_NOTICE, "Allocating A-Interface subscriber conn: lac %i, conn_id %i\n", lac, conn_id); - - conn = talloc_zero(network, struct gsm_subscriber_connection); - if (!conn) - return NULL; - - conn->network = network; - conn->via_ran = RAN_GERAN_A; - conn->lac = lac; - - conn->a.conn_id = conn_id; - conn->a.scu = scu; - - /* Also backup the calling address of the BSC, this allows us to - * identify later which BSC is responsible for this subscriber connection */ - memcpy(&conn->a.bsc_addr, a_conn_info->bsc_addr, sizeof(conn->a.bsc_addr)); - - llist_add_tail(&conn->entry, &network->subscr_conns); - LOGP(DMSC, LOGL_NOTICE, "A-Interface subscriber connection successfully allocated!\n"); - return conn; -} - -/* Return an existing A subscriber connection record for the given - * connection IDs, or return NULL if not found. */ -static struct gsm_subscriber_connection *subscr_conn_lookup_a(const struct gsm_network *network, int conn_id) -{ - struct gsm_subscriber_connection *conn; - - OSMO_ASSERT(network); - - DEBUGP(DMSC, "Looking for A subscriber: conn_id %i\n", conn_id); - - /* FIXME: log_subscribers() is defined in iucs.c as static inline, if - * maybe this function should be public to reach it from here? */ - /* log_subscribers(network); */ - - llist_for_each_entry(conn, &network->subscr_conns, entry) { - if (conn->via_ran == RAN_GERAN_A && conn->a.conn_id == conn_id) { - DEBUGP(DIUCS, "Found A subscriber for conn_id %i\n", conn_id); - return conn; - } - } - DEBUGP(DMSC, "No A subscriber found for conn_id %i\n", conn_id); - return NULL; -} - -/* - * BSSMAP handling for UNITDATA - */ - -/* Endpoint to handle BSSMAP reset */ -static void bssmap_rx_reset(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct osmo_ss7_instance *ss7; - - ss7 = osmo_ss7_instance_find(network->a.cs7_instance); - OSMO_ASSERT(ss7); - - LOGP(DMSC, LOGL_NOTICE, "Rx RESET from BSC %s, sending RESET ACK\n", - osmo_sccp_addr_name(ss7, a_conn_info->bsc_addr)); - osmo_sccp_tx_unitdata_msg(scu, a_conn_info->msc_addr, a_conn_info->bsc_addr, gsm0808_create_reset_ack()); - - /* Make sure all orphand subscriber connections will be cleard */ - a_clear_all(scu, a_conn_info->bsc_addr); - - msgb_free(msg); -} - -/* Endpoint to handle BSSMAP reset acknowlegement */ -static void bssmap_rx_reset_ack(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, - struct msgb *msg) -{ - - struct gsm_network *network = a_conn_info->network; - struct osmo_ss7_instance *ss7; - - ss7 = osmo_ss7_instance_find(network->a.cs7_instance); - OSMO_ASSERT(ss7); - - if (a_conn_info->reset == NULL) { - LOGP(DMSC, LOGL_ERROR, "Received RESET ACK from an unknown BSC %s, ignoring...\n", - osmo_sccp_addr_name(ss7, a_conn_info->bsc_addr)); - goto fail; - } - - LOGP(DMSC, LOGL_NOTICE, "Received RESET ACK from BSC %s\n", osmo_sccp_addr_name(ss7, a_conn_info->bsc_addr)); - - /* Confirm that we managed to get the reset ack message - * towards the connection reset logic */ - a_reset_ack_confirm(a_conn_info->reset); - -fail: - msgb_free(msg); -} - -/* Handle UNITDATA BSSMAP messages */ -static void bssmap_rcvmsg_udt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - /* Note: When in the MSC role, RESET ACK is the only valid message that - * can be received via UNITDATA */ - - if (msgb_l3len(msg) < 1) { - LOGP(DMSC, LOGL_NOTICE, "Error: No data received -- discarding message!\n"); - return; - } - - LOGP(DMSC, LOGL_NOTICE, "Rx BSC UDT BSSMAP %s\n", gsm0808_bssmap_name(msg->l3h[0])); - - switch (msg->l3h[0]) { - case BSS_MAP_MSG_RESET: - bssmap_rx_reset(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_RESET_ACKNOWLEDGE: - bssmap_rx_reset_ack(scu, a_conn_info, msg); - break; - default: - LOGP(DMSC, LOGL_NOTICE, "Unimplemented message format: %s -- message discarded!\n", - gsm0808_bssmap_name(msg->l3h[0])); - msgb_free(msg); - } -} - -/* Receive incoming connection less data messages via sccp */ -void sccp_rx_udt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - /* Note: The only valid message type that can be received - * via UNITDATA are BSS Management messages */ - struct bssmap_header *bs; - - OSMO_ASSERT(scu); - OSMO_ASSERT(a_conn_info); - OSMO_ASSERT(msg); - - LOGP(DMSC, LOGL_NOTICE, "Rx BSC UDT: %s\n", osmo_hexdump(msgb_l2(msg), msgb_l2len(msg))); - - if (msgb_l2len(msg) < sizeof(*bs)) { - LOGP(DMSC, LOGL_ERROR, "Error: Header is too short -- discarding message!\n"); - msgb_free(msg); - return; - } - - bs = (struct bssmap_header *)msgb_l2(msg); - if (bs->length < msgb_l2len(msg) - sizeof(*bs)) { - LOGP(DMSC, LOGL_ERROR, "Error: Message is too short -- discarding message!\n"); - msgb_free(msg); - return; - } - - switch (bs->type) { - case BSSAP_MSG_BSS_MANAGEMENT: - msg->l3h = &msg->l2h[sizeof(struct bssmap_header)]; - bssmap_rcvmsg_udt(scu, a_conn_info, msg); - break; - default: - LOGP(DMSC, LOGL_ERROR, - "Error: Unimplemented message type: %s -- message discarded!\n", gsm0808_bssmap_name(bs->type)); - msgb_free(msg); - } -} - -/* - * BSSMAP handling for connection oriented data - */ - -/* Endpoint to handle BSSMAP clear request */ -static int bssmap_rx_clear_rqst(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct tlv_parsed tp; - int rc; - struct msgb *msg_resp; - uint8_t cause; - struct gsm_subscriber_connection *conn; - - LOGP(DMSC, LOGL_NOTICE, "BSC requested to clear connection (conn_id=%i)\n", a_conn_info->conn_id); - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - if (!TLVP_PRESENT(&tp, GSM0808_IE_CAUSE)) { - LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); - goto fail; - } - cause = TLVP_VAL(&tp, GSM0808_IE_CAUSE)[0]; - - /* Respond with clear command */ - msg_resp = gsm0808_create_clear_command(GSM0808_CAUSE_CALL_CONTROL); - rc = osmo_sccp_tx_data_msg(scu, a_conn_info->conn_id, msg_resp); - - /* If possible, inform the MSC about the clear request */ - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) - goto fail; - msc_clear_request(conn, cause); - - msgb_free(msg); - return rc; - -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Endpoint to handle BSSMAP clear complete */ -static int bssmap_rx_clear_complete(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - int rc; - - LOGP(DMSC, LOGL_NOTICE, "Releasing connection (conn_id=%i)\n", a_conn_info->conn_id); - rc = osmo_sccp_tx_disconn(scu, a_conn_info->conn_id, - a_conn_info->msc_addr, SCCP_RELEASE_CAUSE_END_USER_ORIGINATED); - - /* Remove the record from the list with active connections. */ - a_delete_bsc_con(a_conn_info->conn_id); - - msgb_free(msg); - return rc; -} - -/* Endpoint to handle layer 3 complete messages */ -static int bssmap_rx_l3_compl(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - struct tlv_parsed tp; - struct { - uint8_t ident; - struct gsm48_loc_area_id lai; - uint16_t ci; - } __attribute__ ((packed)) lai_ci; - uint16_t mcc; - uint16_t mnc; - uint16_t lac; - uint8_t data_length; - const uint8_t *data; - int rc; - - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - - LOGP(DMSC, LOGL_NOTICE, "BSC has completed layer 3 connection (conn_id=%i)\n", a_conn_info->conn_id); - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - if (!TLVP_PRESENT(&tp, GSM0808_IE_CELL_IDENTIFIER)) { - LOGP(DMSC, LOGL_ERROR, "Mandatory CELL IDENTIFIER not present -- discarding message!\n"); - goto fail; - } - if (!TLVP_PRESENT(&tp, GSM0808_IE_LAYER_3_INFORMATION)) { - LOGP(DMSC, LOGL_ERROR, "Mandatory LAYER 3 INFORMATION not present -- discarding message!\n"); - goto fail; - } - - /* Parse Cell ID element */ - /* FIXME: Encapsulate this in a parser/generator function inside - * libosmocore, add support for all specified cell identification - * discriminators (see 3GPP ts 3.2.2.17 Cell Identifier) */ - data_length = TLVP_LEN(&tp, GSM0808_IE_CELL_IDENTIFIER); - data = TLVP_VAL(&tp, GSM0808_IE_CELL_IDENTIFIER); - if (sizeof(lai_ci) != data_length) { - LOGP(DMSC, LOGL_ERROR, - "Unable to parse element CELL IDENTIFIER (wrong field length) -- discarding message!\n"); - goto fail; - } - memcpy(&lai_ci, data, sizeof(lai_ci)); - if (lai_ci.ident != CELL_IDENT_WHOLE_GLOBAL) { - LOGP(DMSC, LOGL_ERROR, - "Unable to parse element CELL IDENTIFIER (wrong cell identification discriminator) -- discarding message!\n"); - goto fail; - } - if (gsm48_decode_lai(&lai_ci.lai, &mcc, &mnc, &lac) != 0) { - LOGP(DMSC, LOGL_ERROR, - "Unable to parse element CELL IDENTIFIER (lai decoding failed) -- discarding message!\n"); - goto fail; - } - - /* Parse Layer 3 Information element */ - /* FIXME: This is probably to hackish, compiler also complains "assignment discards ‘const’ qualifier..." */ - msg->l3h = TLVP_VAL(&tp, GSM0808_IE_LAYER_3_INFORMATION); - msg->tail = msg->l3h + TLVP_LEN(&tp, GSM0808_IE_LAYER_3_INFORMATION); - - /* Create new subscriber context */ - conn = subscr_conn_allocate_a(a_conn_info, network, lac, scu, a_conn_info->conn_id); - - /* Handover location update to the MSC code */ - /* msc_compl_l3() takes ownership of dtap_msg - * message buffer */ - rc = msc_compl_l3(conn, msg, 0); - if (rc == MSC_CONN_ACCEPT) { - LOGP(DMSC, LOGL_NOTICE, "User has been accepted by MSC.\n"); - return 0; - } else if (rc == MSC_CONN_REJECT) - LOGP(DMSC, LOGL_NOTICE, "User has been rejected by MSC.\n"); - else - LOGP(DMSC, LOGL_NOTICE, "User has been rejected by MSC (unknown error)\n"); - - return -EINVAL; - -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Endpoint to handle BSSMAP classmark update */ -static int bssmap_rx_classmark_upd(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - struct tlv_parsed tp; - const uint8_t *cm2 = NULL; - const uint8_t *cm3 = NULL; - uint8_t cm2_len = 0; - uint8_t cm3_len = 0; - - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) - goto fail; - - LOGP(DMSC, LOGL_NOTICE, "BSC sends clasmark update (conn_id=%i)\n", conn->a.conn_id); - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - if (!TLVP_PRESENT(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T2)) { - LOGP(DMSC, LOGL_ERROR, "Mandatory Classmark Information Type 2 not present -- discarding message!\n"); - goto fail; - } - - cm2 = TLVP_VAL(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T2); - cm2_len = TLVP_LEN(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T2); - - if (TLVP_PRESENT(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T3)) { - cm3 = TLVP_VAL(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T3); - cm3_len = TLVP_LEN(&tp, GSM0808_IE_CLASSMARK_INFORMATION_T3); - } - - /* Inform MSC about the classmark change */ - msc_classmark_chg(conn, cm2, cm2_len, cm3, cm3_len); - - msgb_free(msg); - return 0; - -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Endpoint to handle BSSMAP cipher mode complete */ -static int bssmap_rx_ciph_compl(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, - struct msgb *msg) -{ - /* FIXME: The field GSM0808_IE_LAYER_3_MESSAGE_CONTENTS is optional by - * means of the specification. So there can be messages without L3 info. - * In this case, the code will crash becrause msc_cipher_mode_compl() - * is not able to deal with msg = NULL and apperently - * msc_cipher_mode_compl() was never meant to be used without L3 data. - * This needs to be discussed further! */ - - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - struct tlv_parsed tp; - uint8_t alg_id = 1; - - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) - goto fail; - - LOGP(DMSC, LOGL_NOTICE, "BSC sends cipher mode complete (conn_id=%i)\n", conn->a.conn_id); - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - - if (TLVP_PRESENT(&tp, GSM0808_IE_CHOSEN_ENCR_ALG)) { - alg_id = TLVP_VAL(&tp, GSM0808_IE_CHOSEN_ENCR_ALG)[0] - 1; - } - - if (TLVP_PRESENT(&tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS)) { - msg->l3h = TLVP_VAL(&tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS); - msg->tail = msg->l3h + TLVP_LEN(&tp, GSM0808_IE_LAYER_3_MESSAGE_CONTENTS); - } else { - msgb_free(msg); - msg = NULL; - } - - /* Hand over cipher mode complete message to the MSC, - * msc_cipher_mode_compl() takes ownership for msg */ - msc_cipher_mode_compl(conn, msg, alg_id); - - return 0; -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Endpoint to handle BSSMAP cipher mode reject */ -static int bssmap_rx_ciph_rej(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - struct tlv_parsed tp; - uint8_t cause; - - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) - goto fail; - - LOGP(DMSC, LOGL_NOTICE, "BSC sends cipher mode reject (conn_id=%i)\n", conn->a.conn_id); - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - if (!TLVP_PRESENT(&tp, BSS_MAP_MSG_CIPHER_MODE_REJECT)) { - LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); - goto fail; - } - - cause = TLVP_VAL(&tp, BSS_MAP_MSG_CIPHER_MODE_REJECT)[0]; - LOGP(DMSC, LOGL_NOTICE, "Cipher mode rejection cause: %i\n", cause); - - /* FIXME: Can we do something meaningful here? e.g. report to the - * msc code somehow that the cipher mode command has failed. */ - - msgb_free(msg); - return 0; -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Endpoint to handle BSSMAP assignment failure */ -static int bssmap_rx_ass_fail(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - struct tlv_parsed tp; - uint8_t cause; - uint8_t *rr_cause_ptr = NULL; - uint8_t rr_cause; - - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) - goto fail; - - LOGP(DMSC, LOGL_NOTICE, "BSC sends assignment failure message (conn_id=%i)\n", conn->a.conn_id); - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - if (!TLVP_PRESENT(&tp, GSM0808_IE_CAUSE)) { - LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); - goto fail; - } - cause = TLVP_VAL(&tp, GSM0808_IE_CAUSE)[0]; - - if (TLVP_PRESENT(&tp, GSM0808_IE_RR_CAUSE)) { - rr_cause = TLVP_VAL(&tp, GSM0808_IE_RR_CAUSE)[0]; - rr_cause_ptr = &rr_cause; - } - - /* FIXME: In AoIP, the Assignment failure will carry also an optional - * Codec List (BSS Supported) element. It has to be discussed if we - * can ignore this element. If not, The msc_assign_fail() function - * call has to change. However msc_assign_fail() does nothing in the - * end. So probably we can just leave it as it is. Even for AoIP */ - - /* Inform the MSC about the assignment failure event */ - msc_assign_fail(conn, cause, rr_cause_ptr); - - msgb_free(msg); - return 0; -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Endpoint to handle sapi "n" reject */ -static int bssmap_rx_sapi_n_rej(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, - struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - struct tlv_parsed tp; - uint8_t dlci; - - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) - goto fail; - - LOGP(DMSC, LOGL_NOTICE, "BSC sends sapi \"n\" reject message (conn_id=%i)\n", conn->a.conn_id); - - /* Note: The MSC code seems not to care about the cause code, but by - * the specification it is mandatory, so we check its presence. See - * also 3GPP TS 48.008 3.2.1.34 SAPI "n" REJECT */ - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - if (!TLVP_PRESENT(&tp, GSM0808_IE_CAUSE)) { - LOGP(DMSC, LOGL_ERROR, "Cause code is missing -- discarding message!\n"); - goto fail; - } - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - if (!TLVP_PRESENT(&tp, GSM0808_IE_DLCI)) { - LOGP(DMSC, LOGL_ERROR, "DLCI is missing -- discarding message!\n"); - goto fail; - } - dlci = TLVP_VAL(&tp, GSM0808_IE_DLCI)[0]; - - /* Inform the MSC about the sapi "n" reject event */ - msc_sapi_n_reject(conn, dlci); - - msgb_free(msg); - return 0; -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Endpoint to handle assignment complete */ -static int bssmap_rx_ass_compl(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, - struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - struct mgcpgw_client *mgcp; - struct tlv_parsed tp; - struct sockaddr_storage rtp_addr; - struct sockaddr_in *rtp_addr_in; - int rc; - - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) - goto fail; - - mgcp = conn->network->mgcpgw.client; - OSMO_ASSERT(mgcp); - - LOGP(DMSC, LOGL_NOTICE, "BSC sends assignment complete message (conn_id=%i)\n", conn->a.conn_id); - - tlv_parse(&tp, gsm0808_att_tlvdef(), msg->l3h + 1, msgb_l3len(msg) - 1, 0, 0); - - if (!TLVP_PRESENT(&tp, GSM0808_IE_AOIP_TRASP_ADDR)) { - LOGP(DMSC, LOGL_ERROR, "AoIP transport identifier missing -- discarding message!\n"); - goto fail; - } - - /* Decode AoIP transport address element */ - rc = gsm0808_dec_aoip_trasp_addr(&rtp_addr, TLVP_VAL(&tp, GSM0808_IE_AOIP_TRASP_ADDR), - TLVP_LEN(&tp, GSM0808_IE_AOIP_TRASP_ADDR)); - if (rc < 0) { - LOGP(DMSC, LOGL_ERROR, "Unable to decode aoip transport address.\n"); - goto fail; - } - - /* use address / port supplied with the AoIP - * transport address element */ - if (rtp_addr.ss_family == AF_INET) { - rtp_addr_in = (struct sockaddr_in *)&rtp_addr; - conn->rtp.port_subscr = osmo_ntohs(rtp_addr_in->sin_port); - /* FIXME: We also get the IP-Address of the remote (e.g. BTS) - * end with the response. Currently we just ignore that address. - * Instead we expect that our local MGCP gateway and the code - * controlling it, magically knows the IP of the remote end. */ - } else { - LOGP(DMSC, LOGL_ERROR, "Unsopported addressing scheme. (supports only IPV4)\n"); - goto fail; - } - - /* FIXME: Seems to be related to authentication or, - encryption. Is this really in the right place? */ - msc_rx_sec_mode_compl(conn); - - msgb_free(msg); - return 0; -fail: - msgb_free(msg); - return -EINVAL; -} - -/* Handle incoming connection oriented BSSMAP messages */ -static int rx_bssmap(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - if (msgb_l3len(msg) < 1) { - LOGP(DMSC, LOGL_NOTICE, "Error: No data received -- discarding message!\n"); - msgb_free(msg); - return -1; - } - - LOGP(DMSC, LOGL_NOTICE, "Rx MSC DT1 BSSMAP %s\n", gsm0808_bssmap_name(msg->l3h[0])); - - switch (msg->l3h[0]) { - case BSS_MAP_MSG_CLEAR_RQST: - return bssmap_rx_clear_rqst(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_CLEAR_COMPLETE: - return bssmap_rx_clear_complete(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_COMPLETE_LAYER_3: - return bssmap_rx_l3_compl(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_CLASSMARK_UPDATE: - return bssmap_rx_classmark_upd(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_CIPHER_MODE_COMPLETE: - return bssmap_rx_ciph_compl(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_CIPHER_MODE_REJECT: - return bssmap_rx_ciph_rej(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_ASSIGMENT_FAILURE: - return bssmap_rx_ass_fail(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_SAPI_N_REJECT: - return bssmap_rx_sapi_n_rej(scu, a_conn_info, msg); - break; - case BSS_MAP_MSG_ASSIGMENT_COMPLETE: - return bssmap_rx_ass_compl(scu, a_conn_info, msg); - break; - default: - LOGP(DMSC, LOGL_ERROR, "Unimplemented msg type: %s\n", gsm0808_bssmap_name(msg->l3h[0])); - msgb_free(msg); - return -EINVAL; - } - - return -EINVAL; -} - -/* Endpoint to handle regular BSSAP DTAP messages */ -static int rx_dtap(const struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - struct gsm_network *network = a_conn_info->network; - struct gsm_subscriber_connection *conn; - - conn = subscr_conn_lookup_a(network, a_conn_info->conn_id); - if (!conn) { - msgb_free(msg); - return -EINVAL; - } - - LOGP(DMSC, LOGL_NOTICE, "BSC sends layer 3 dtap (conn_id=%i)\n", conn->a.conn_id); - - /* msc_dtap expects the dtap payload in l3h */ - msg->l3h = msg->l2h + 3; - - /* Forward dtap payload into the msc, - * msc_dtap() takes ownership for msg */ - msc_dtap(conn, conn->a.conn_id, msg); - - return 0; -} - -/* Handle incoming connection oriented messages */ -int sccp_rx_dt(struct osmo_sccp_user *scu, const struct a_conn_info *a_conn_info, struct msgb *msg) -{ - OSMO_ASSERT(scu); - OSMO_ASSERT(a_conn_info); - OSMO_ASSERT(msg); - - LOGP(DMSC, LOGL_NOTICE, "Rx BSC DT: %s\n", osmo_hexdump(msgb_l2(msg), msgb_l2len(msg))); - - if (msgb_l2len(msg) < sizeof(struct bssmap_header)) { - LOGP(DMSC, LOGL_NOTICE, "The header is too short -- discarding message!\n"); - msgb_free(msg); - } - - switch (msg->l2h[0]) { - case BSSAP_MSG_BSS_MANAGEMENT: - msg->l3h = &msg->l2h[sizeof(struct bssmap_header)]; - return rx_bssmap(scu, a_conn_info, msg); - break; - case BSSAP_MSG_DTAP: - return rx_dtap(scu, a_conn_info, msg); - break; - default: - LOGP(DMSC, LOGL_ERROR, "Unimplemented BSSAP msg type: %s\n", gsm0808_bssap_name(msg->l2h[0])); - msgb_free(msg); - return -EINVAL; - } - - return -EINVAL; -} |