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Diffstat (limited to 'src/libmsc/a_iface_bssap.c')
-rw-r--r--src/libmsc/a_iface_bssap.c716
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;
-}