This patch moves the GSM-specific functions to the new library

libosmogsm which is provided by libosmocore.

I have also moved generate_backtrace() to backtrace.c instead
of gsm_utils.c, otherwise the timer and msgfile tests depend on
libosmogsm.

Signed-off-by: Pablo Neira Ayuso <pablo@gnumonks.org>

1 files changed, 369 insertions, 0 deletions

diff --git a/src/gsm/gsm0808.c b/src/gsm/gsm0808.c
new file mode 100644
index 00000000..dc450cc4
--- /dev/null
+++ b/src/gsm/gsm0808.c
@@ -0,0 +1,369 @@
+/* (C) 2009,2010 by Holger Hans Peter Freyther <zecke@selfish.org>
+ * (C) 2009,2010 by On-Waves
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+
+#include <osmocore/gsm0808.h>
+#include <osmocore/protocol/gsm_08_08.h>
+#include <osmocore/gsm48.h>
+
+#include <arpa/inet.h>
+
+#define BSSMAP_MSG_SIZE 512
+#define BSSMAP_MSG_HEADROOM 128
+
+static void put_data_16(uint8_t *data, const uint16_t val)
+{
+	memcpy(data, &val, sizeof(val));
+}
+
+struct msgb *gsm0808_create_layer3(struct msgb *msg_l3, uint16_t nc, uint16_t cc, int lac, uint16_t _ci)
+{
+	uint8_t *data;
+	uint8_t *ci;
+	struct msgb* msg;
+	struct gsm48_loc_area_id *lai;
+
+	msg  = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+				   "bssmap cmpl l3");
+	if (!msg)
+		return NULL;
+
+	/* create the bssmap header */
+	msg->l3h = msgb_put(msg, 2);
+	msg->l3h[0] = 0x0;
+
+	/* create layer 3 header */
+	data = msgb_put(msg, 1);
+	data[0] = BSS_MAP_MSG_COMPLETE_LAYER_3;
+
+	/* create the cell header */
+	data = msgb_put(msg, 3);
+	data[0] = GSM0808_IE_CELL_IDENTIFIER;
+	data[1] = 1 + sizeof(*lai) + 2;
+	data[2] = CELL_IDENT_WHOLE_GLOBAL;
+
+	lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai));
+	gsm48_generate_lai(lai, cc, nc, lac);
+
+	ci = msgb_put(msg, 2);
+	put_data_16(ci, htons(_ci));
+
+	/* copy the layer3 data */
+	data = msgb_put(msg, msgb_l3len(msg_l3) + 2);
+	data[0] = GSM0808_IE_LAYER_3_INFORMATION;
+	data[1] = msgb_l3len(msg_l3);
+	memcpy(&data[2], msg_l3->l3h, data[1]);
+
+	/* update the size */
+	msg->l3h[1] = msgb_l3len(msg) - 2;
+
+	return msg;
+}
+
+struct msgb *gsm0808_create_reset(void)
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "bssmap: reset");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 6);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 0x04;
+	msg->l3h[2] = 0x30;
+	msg->l3h[3] = 0x04;
+	msg->l3h[4] = 0x01;
+	msg->l3h[5] = 0x20;
+	return msg;
+}
+
+struct msgb *gsm0808_create_clear_complete(void)
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "bssmap: clear complete");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 3);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 1;
+	msg->l3h[2] = BSS_MAP_MSG_CLEAR_COMPLETE;
+
+	return msg;
+}
+
+struct msgb *gsm0808_create_clear_command(uint8_t reason)
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "bssmap: clear command");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_tv_put(msg, BSSAP_MSG_BSS_MANAGEMENT, 4);
+	msgb_v_put(msg, BSS_MAP_MSG_CLEAR_CMD);
+	msgb_tlv_put(msg, GSM0808_IE_CAUSE, 1, &reason);
+	return msg;
+}
+
+struct msgb *gsm0808_create_cipher_complete(struct msgb *layer3, uint8_t alg_id)
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "cipher-complete");
+	if (!msg)
+		return NULL;
+
+        /* send response with BSS override for A5/1... cheating */
+	msg->l3h = msgb_put(msg, 3);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 0xff;
+	msg->l3h[2] = BSS_MAP_MSG_CIPHER_MODE_COMPLETE;
+
+	/* include layer3 in case we have at least two octets */
+	if (layer3 && msgb_l3len(layer3) > 2) {
+		msg->l4h = msgb_put(msg, msgb_l3len(layer3) + 2);
+		msg->l4h[0] = GSM0808_IE_LAYER_3_MESSAGE_CONTENTS;
+		msg->l4h[1] = msgb_l3len(layer3);
+		memcpy(&msg->l4h[2], layer3->l3h, msgb_l3len(layer3));
+	}
+
+	/* and the optional BSS message */
+	msg->l4h = msgb_put(msg, 2);
+	msg->l4h[0] = GSM0808_IE_CHOSEN_ENCR_ALG;
+	msg->l4h[1] = alg_id;
+
+	/* update the size */
+	msg->l3h[1] = msgb_l3len(msg) - 2;
+	return msg;
+}
+
+struct msgb *gsm0808_create_cipher_reject(uint8_t cause)
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "bssmap: clear complete");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 3);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 2;
+	msg->l3h[2] = BSS_MAP_MSG_CIPHER_MODE_REJECT;
+	msg->l3h[3] = cause;
+
+	return msg;
+}
+
+struct msgb *gsm0808_create_classmark_update(const uint8_t *classmark_data, uint8_t length)
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "classmark-update");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 3);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 0xff;
+	msg->l3h[2] = BSS_MAP_MSG_CLASSMARK_UPDATE;
+
+	msg->l4h = msgb_put(msg, length);
+	memcpy(msg->l4h, classmark_data, length);
+
+	/* update the size */
+	msg->l3h[1] = msgb_l3len(msg) - 2;
+	return msg;
+}
+
+struct msgb *gsm0808_create_sapi_reject(uint8_t link_id)
+{
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "bssmap: sapi 'n' reject");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 5);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 3;
+	msg->l3h[2] = BSS_MAP_MSG_SAPI_N_REJECT;
+	msg->l3h[3] = link_id;
+	msg->l3h[4] = GSM0808_CAUSE_BSS_NOT_EQUIPPED;
+
+	return msg;
+}
+
+struct msgb *gsm0808_create_assignment_completed(uint8_t rr_cause,
+						 uint8_t chosen_channel, uint8_t encr_alg_id,
+						 uint8_t speech_mode)
+{
+	uint8_t *data;
+
+	struct msgb *msg = msgb_alloc(35, "bssmap: ass compl");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 3);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 0xff;
+	msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_COMPLETE;
+
+	/* write 3.2.2.22 */
+	data = msgb_put(msg, 2);
+	data[0] = GSM0808_IE_RR_CAUSE;
+	data[1] = rr_cause;
+
+	/* write cirtcuit identity  code 3.2.2.2 */
+	/* write cell identifier 3.2.2.17 */
+	/* write chosen channel 3.2.2.33 when BTS picked it */
+	data = msgb_put(msg, 2);
+	data[0] = GSM0808_IE_CHOSEN_CHANNEL;
+	data[1] = chosen_channel;
+
+	/* write chosen encryption algorithm 3.2.2.44 */
+	data = msgb_put(msg, 2);
+	data[0] = GSM0808_IE_CHOSEN_ENCR_ALG;
+	data[1] = encr_alg_id;
+
+	/* write circuit pool 3.2.2.45 */
+	/* write speech version chosen: 3.2.2.51 when BTS picked it */
+	if (speech_mode != 0) {
+		data = msgb_put(msg, 2);
+		data[0] = GSM0808_IE_SPEECH_VERSION;
+		data[1] = speech_mode;
+	}
+
+	/* write LSA identifier 3.2.2.15 */
+
+
+	/* update the size */
+	msg->l3h[1] = msgb_l3len(msg) - 2;
+	return msg;
+}
+
+struct msgb *gsm0808_create_assignment_failure(uint8_t cause, uint8_t *rr_cause)
+{
+	uint8_t *data;
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "bssmap: ass fail");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 6);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 0xff;
+	msg->l3h[2] = BSS_MAP_MSG_ASSIGMENT_FAILURE;
+	msg->l3h[3] = GSM0808_IE_CAUSE;
+	msg->l3h[4] = 1;
+	msg->l3h[5] = cause;
+
+	/* RR cause 3.2.2.22 */
+	if (rr_cause) {
+		data = msgb_put(msg, 2);
+		data[0] = GSM0808_IE_RR_CAUSE;
+		data[1] = *rr_cause;
+	}
+
+	/* Circuit pool 3.22.45 */
+	/* Circuit pool list 3.2.2.46 */
+
+	/* update the size */
+	msg->l3h[1] = msgb_l3len(msg) - 2;
+	return msg;
+}
+
+struct msgb *gsm0808_create_clear_rqst(uint8_t cause)
+{
+	struct msgb *msg;
+
+	msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+				  "bssmap: clear rqst");
+	if (!msg)
+		return NULL;
+
+	msg->l3h = msgb_put(msg, 2 + 4);
+	msg->l3h[0] = BSSAP_MSG_BSS_MANAGEMENT;
+	msg->l3h[1] = 4;
+
+	msg->l3h[2] = BSS_MAP_MSG_CLEAR_RQST;
+	msg->l3h[3] = GSM0808_IE_CAUSE;
+	msg->l3h[4] = 1;
+	msg->l3h[5] = cause;
+	return msg;
+}
+
+void gsm0808_prepend_dtap_header(struct msgb *msg, uint8_t link_id)
+{
+	uint8_t *hh = msgb_push(msg, 3);
+	hh[0] = BSSAP_MSG_DTAP;
+	hh[1] = link_id;
+	hh[2] = msg->len - 3;
+}
+
+struct msgb *gsm0808_create_dtap(struct msgb *msg_l3, uint8_t link_id)
+{
+	struct dtap_header *header;
+	uint8_t *data;
+	struct msgb *msg = msgb_alloc_headroom(BSSMAP_MSG_SIZE, BSSMAP_MSG_HEADROOM,
+					       "dtap");
+	if (!msg)
+		return NULL;
+
+	/* DTAP header */
+	msg->l3h = msgb_put(msg, sizeof(*header));
+	header = (struct dtap_header *) &msg->l3h[0];
+	header->type = BSSAP_MSG_DTAP;
+	header->link_id = link_id;
+	header->length = msgb_l3len(msg_l3);
+
+	/* Payload */
+	data = msgb_put(msg, header->length);
+	memcpy(data, msg_l3->l3h, header->length);
+
+	return msg;
+}
+
+static const struct tlv_definition bss_att_tlvdef = {
+	.def = {
+		[GSM0808_IE_IMSI]		    = { TLV_TYPE_TLV },
+		[GSM0808_IE_TMSI]		    = { TLV_TYPE_TLV },
+		[GSM0808_IE_CELL_IDENTIFIER_LIST]   = { TLV_TYPE_TLV },
+		[GSM0808_IE_CHANNEL_NEEDED]	    = { TLV_TYPE_TV },
+		[GSM0808_IE_EMLPP_PRIORITY]	    = { TLV_TYPE_TV },
+		[GSM0808_IE_CHANNEL_TYPE]	    = { TLV_TYPE_TLV },
+		[GSM0808_IE_PRIORITY]		    = { TLV_TYPE_TLV },
+		[GSM0808_IE_CIRCUIT_IDENTITY_CODE]  = { TLV_TYPE_FIXED, 2 },
+		[GSM0808_IE_DOWNLINK_DTX_FLAG]	    = { TLV_TYPE_TV },
+		[GSM0808_IE_INTERFERENCE_BAND_TO_USE] = { TLV_TYPE_TV },
+		[GSM0808_IE_CLASSMARK_INFORMATION_T2] = { TLV_TYPE_TLV },
+		[GSM0808_IE_GROUP_CALL_REFERENCE]   = { TLV_TYPE_TLV },
+		[GSM0808_IE_TALKER_FLAG]	    = { TLV_TYPE_T },
+		[GSM0808_IE_CONFIG_EVO_INDI]	    = { TLV_TYPE_TV },
+		[GSM0808_IE_LSA_ACCESS_CTRL_SUPPR]  = { TLV_TYPE_TV },
+		[GSM0808_IE_SERVICE_HANDOVER]	    = { TLV_TYPE_TLV },
+		[GSM0808_IE_ENCRYPTION_INFORMATION] = { TLV_TYPE_TLV },
+		[GSM0808_IE_CIPHER_RESPONSE_MODE]   = { TLV_TYPE_TV },
+		[GSM0808_IE_CELL_IDENTIFIER]	    = { TLV_TYPE_TLV },
+		[GSM0808_IE_CHOSEN_CHANNEL]	    = { TLV_TYPE_TV },
+		[GSM0808_IE_LAYER_3_INFORMATION]    = { TLV_TYPE_TLV },
+		[GSM0808_IE_SPEECH_VERSION]         = { TLV_TYPE_TV },
+		[GSM0808_IE_CHOSEN_ENCR_ALG]        = { TLV_TYPE_TV },
+	},
+};
+
+const struct tlv_definition *gsm0808_att_tlvdef()
+{
+	return &bss_att_tlvdef;
+}