move openbsc into its own subdirectory
diff --git a/openbsc/src/gsm_04_08.c b/openbsc/src/gsm_04_08.c
new file mode 100644
index 0000000..274d3b6
--- /dev/null
+++ b/openbsc/src/gsm_04_08.c
@@ -0,0 +1,1723 @@
+/* GSM Mobile Radio Interface Layer 3 messages on the A-bis interface
+ * 3GPP TS 04.08 version 7.21.0 Release 1998 / ETSI TS 100 940 V7.21.0 */
+
+/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
+ * (C) 2008, 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
+ *
+ * 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 <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <netinet/in.h>
+
+#include <openbsc/db.h>
+#include <openbsc/msgb.h>
+#include <openbsc/tlv.h>
+#include <openbsc/debug.h>
+#include <openbsc/gsm_data.h>
+#include <openbsc/gsm_subscriber.h>
+#include <openbsc/gsm_04_11.h>
+#include <openbsc/gsm_04_08.h>
+#include <openbsc/abis_rsl.h>
+#include <openbsc/chan_alloc.h>
+#include <openbsc/paging.h>
+#include <openbsc/signal.h>
+#include <openbsc/trau_frame.h>
+#include <openbsc/trau_mux.h>
+
+#define GSM48_ALLOC_SIZE 1024
+#define GSM48_ALLOC_HEADROOM 128
+
+static const struct tlv_definition rsl_att_tlvdef = {
+ .def = {
+ [GSM48_IE_MOBILE_ID] = { TLV_TYPE_TLV },
+ [GSM48_IE_NAME_LONG] = { TLV_TYPE_TLV },
+ [GSM48_IE_NAME_SHORT] = { TLV_TYPE_TLV },
+ [GSM48_IE_UTC] = { TLV_TYPE_TV },
+ [GSM48_IE_NET_TIME_TZ] = { TLV_TYPE_FIXED, 7 },
+ [GSM48_IE_LSA_IDENT] = { TLV_TYPE_TLV },
+
+ [GSM48_IE_BEARER_CAP] = { TLV_TYPE_TLV },
+ [GSM48_IE_CAUSE] = { TLV_TYPE_TLV },
+ [GSM48_IE_CC_CAP] = { TLV_TYPE_TLV },
+ [GSM48_IE_ALERT] = { TLV_TYPE_TLV },
+ [GSM48_IE_FACILITY] = { TLV_TYPE_TLV },
+ [GSM48_IE_PROGR_IND] = { TLV_TYPE_TLV },
+ [GSM48_IE_AUX_STATUS] = { TLV_TYPE_TLV },
+ [GSM48_IE_KPD_FACILITY] = { TLV_TYPE_TV },
+ [GSM48_IE_SIGNAL] = { TLV_TYPE_TV },
+ [GSM48_IE_CONN_NUM] = { TLV_TYPE_TLV },
+ [GSM48_IE_CONN_SUBADDR] = { TLV_TYPE_TLV },
+ [GSM48_IE_CALLING_BCD] = { TLV_TYPE_TLV },
+ [GSM48_IE_CALLING_SUB] = { TLV_TYPE_TLV },
+ [GSM48_IE_CALLED_BCD] = { TLV_TYPE_TLV },
+ [GSM48_IE_CALLED_SUB] = { TLV_TYPE_TLV },
+ [GSM48_IE_REDIR_BCD] = { TLV_TYPE_TLV },
+ [GSM48_IE_REDIR_SUB] = { TLV_TYPE_TLV },
+ [GSM48_IE_LOWL_COMPAT] = { TLV_TYPE_TLV },
+ [GSM48_IE_HIGHL_COMPAT] = { TLV_TYPE_TLV },
+ [GSM48_IE_USER_USER] = { TLV_TYPE_TLV },
+ [GSM48_IE_SS_VERS] = { TLV_TYPE_TLV },
+ [GSM48_IE_MORE_DATA] = { TLV_TYPE_T },
+ [GSM48_IE_CLIR_SUPP] = { TLV_TYPE_T },
+ [GSM48_IE_CLIR_INVOC] = { TLV_TYPE_T },
+ [GSM48_IE_REV_C_SETUP] = { TLV_TYPE_T },
+ /* FIXME: more elements */
+ },
+};
+
+static const char *rr_cause_names[] = {
+ [GSM48_RR_CAUSE_NORMAL] = "Normal event",
+ [GSM48_RR_CAUSE_ABNORMAL_UNSPEC] = "Abnormal release, unspecified",
+ [GSM48_RR_CAUSE_ABNORMAL_UNACCT] = "Abnormal release, channel unacceptable",
+ [GSM48_RR_CAUSE_ABNORMAL_TIMER] = "Abnormal release, timer expired",
+ [GSM48_RR_CAUSE_ABNORMAL_NOACT] = "Abnormal release, no activity on radio path",
+ [GSM48_RR_CAUSE_PREMPTIVE_REL] = "Preemptive release",
+ [GSM48_RR_CAUSE_HNDOVER_IMP] = "Handover impossible, timing advance out of range",
+ [GSM48_RR_CAUSE_CHAN_MODE_UNACCT] = "Channel mode unacceptable",
+ [GSM48_RR_CAUSE_FREQ_NOT_IMPL] = "Frequency not implemented",
+ [GSM48_RR_CAUSE_CALL_CLEARED] = "Call already cleared",
+ [GSM48_RR_CAUSE_SEMANT_INCORR] = "Semantically incorrect message",
+ [GSM48_RR_CAUSE_INVALID_MAND_INF] = "Invalid mandatory information",
+ [GSM48_RR_CAUSE_MSG_TYPE_N] = "Message type non-existant or not implemented",
+ [GSM48_RR_CAUSE_MSG_TYPE_N_COMPAT] = "Message type not compatible with protocol state",
+ [GSM48_RR_CAUSE_COND_IE_ERROR] = "Conditional IE error",
+ [GSM48_RR_CAUSE_NO_CELL_ALLOC_A] = "No cell allocation available",
+ [GSM48_RR_CAUSE_PROT_ERROR_UNSPC] = "Protocol error unspecified",
+};
+
+static char strbuf[64];
+
+static const char *rr_cause_name(u_int8_t cause)
+{
+ if (cause < ARRAY_SIZE(rr_cause_names) &&
+ rr_cause_names[cause])
+ return rr_cause_names[cause];
+
+ snprintf(strbuf, sizeof(strbuf), "0x%02x", cause);
+ return strbuf;
+}
+
+static void parse_meas_rep(struct gsm_meas_rep *rep, const u_int8_t *data,
+ int len)
+{
+ memset(rep, 0, sizeof(*rep));
+
+ if (data[0] & 0x80)
+ rep->flags |= MEAS_REP_F_BA1;
+ if (data[0] & 0x40)
+ rep->flags |= MEAS_REP_F_DTX;
+ if (data[1] & 0x40)
+ rep->flags |= MEAS_REP_F_VALID;
+
+ rep->rxlev_full = data[0] & 0x3f;
+ rep->rxlev_sub = data[1] & 0x3f;
+ rep->rxqual_full = (data[3] >> 4) & 0x7;
+ rep->rxqual_sub = (data[3] >> 1) & 0x7;
+ rep->num_cell = data[4] >> 6 | ((data[3] & 0x01) << 2);
+ if (rep->num_cell < 1)
+ return;
+
+ /* an encoding nightmare in perfection */
+
+ rep->cell[0].rxlev = data[4] & 0x3f;
+ rep->cell[0].bcch_freq = data[5] >> 2;
+ rep->cell[0].bsic = ((data[5] & 0x03) << 3) | (data[6] >> 5);
+ if (rep->num_cell < 2)
+ return;
+
+ rep->cell[1].rxlev = ((data[6] & 0x1f) << 1) | (data[7] >> 7);
+ rep->cell[1].bcch_freq = (data[7] >> 2) & 0x1f;
+ rep->cell[1].bsic = ((data[7] & 0x03) << 4) | (data[8] >> 4);
+ if (rep->num_cell < 3)
+ return;
+
+ rep->cell[2].rxlev = ((data[8] & 0x0f) << 2) | (data[9] >> 6);
+ rep->cell[2].bcch_freq = (data[9] >> 1) & 0x1f;
+ rep->cell[2].bsic = ((data[9] & 0x01) << 6) | (data[10] >> 3);
+ if (rep->num_cell < 4)
+ return;
+
+ rep->cell[3].rxlev = ((data[10] & 0x07) << 3) | (data[11] >> 5);
+ rep->cell[3].bcch_freq = data[11] & 0x1f;
+ rep->cell[3].bsic = data[12] >> 2;
+ if (rep->num_cell < 5)
+ return;
+
+ rep->cell[4].rxlev = ((data[12] & 0x03) << 4) | (data[13] >> 4);
+ rep->cell[4].bcch_freq = ((data[13] & 0xf) << 1) | (data[14] >> 7);
+ rep->cell[4].bsic = (data[14] >> 1) & 0x3f;
+ if (rep->num_cell < 6)
+ return;
+
+ rep->cell[5].rxlev = ((data[14] & 0x01) << 5) | (data[15] >> 3);
+ rep->cell[5].bcch_freq = ((data[15] & 0x07) << 2) | (data[16] >> 6);
+ rep->cell[5].bsic = data[16] & 0x3f;
+}
+
+int gsm0408_loc_upd_acc(struct gsm_lchan *lchan, u_int32_t tmsi);
+static int gsm48_tx_simple(struct gsm_lchan *lchan,
+ u_int8_t pdisc, u_int8_t msg_type);
+static void schedule_reject(struct gsm_lchan *lchan);
+
+struct gsm_lai {
+ u_int16_t mcc;
+ u_int16_t mnc;
+ u_int16_t lac;
+};
+
+static int authorize_everonye = 0;
+void gsm0408_allow_everyone(int everyone)
+{
+ printf("Allowing everyone?\n");
+ authorize_everonye = everyone;
+}
+
+static int reject_cause = 0;
+void gsm0408_set_reject_cause(int cause)
+{
+ reject_cause = cause;
+}
+
+static int authorize_subscriber(struct gsm_loc_updating_operation *loc,
+ struct gsm_subscriber *subscriber)
+{
+ if (!subscriber)
+ return 0;
+
+ /*
+ * Do not send accept yet as more information should arrive. Some
+ * phones will not send us the information and we will have to check
+ * what we want to do with that.
+ */
+ if (loc && (loc->waiting_for_imsi || loc->waiting_for_imei))
+ return 0;
+
+ if (authorize_everonye)
+ return 1;
+
+ return subscriber->authorized;
+}
+
+static void release_loc_updating_req(struct gsm_lchan *lchan)
+{
+ if (!lchan->loc_operation)
+ return;
+
+ bsc_del_timer(&lchan->loc_operation->updating_timer);
+ free(lchan->loc_operation);
+ lchan->loc_operation = 0;
+ put_lchan(lchan);
+}
+
+static void allocate_loc_updating_req(struct gsm_lchan *lchan)
+{
+ use_lchan(lchan);
+ release_loc_updating_req(lchan);
+
+ lchan->loc_operation = (struct gsm_loc_updating_operation *)
+ malloc(sizeof(*lchan->loc_operation));
+ memset(lchan->loc_operation, 0, sizeof(*lchan->loc_operation));
+}
+
+static int gsm0408_authorize(struct gsm_lchan *lchan, struct msgb *msg)
+{
+ u_int32_t tmsi;
+
+ if (authorize_subscriber(lchan->loc_operation, lchan->subscr)) {
+ db_subscriber_alloc_tmsi(lchan->subscr);
+ subscr_update(lchan->subscr, msg->trx->bts, GSM_SUBSCRIBER_UPDATE_ATTACHED);
+ tmsi = strtoul(lchan->subscr->tmsi, NULL, 10);
+ release_loc_updating_req(lchan);
+ return gsm0408_loc_upd_acc(msg->lchan, tmsi);
+ }
+
+ return 0;
+}
+
+static int gsm0408_handle_lchan_signal(unsigned int subsys, unsigned int signal,
+ void *handler_data, void *signal_data)
+{
+ if (subsys != SS_LCHAN || signal != S_LCHAN_UNEXPECTED_RELEASE)
+ return 0;
+
+ /*
+ * Cancel any outstanding location updating request
+ * operation taking place on the lchan.
+ */
+ struct gsm_lchan *lchan = (struct gsm_lchan *)handler_data;
+ release_loc_updating_req(lchan);
+
+ return 0;
+}
+
+/*
+ * This will be ran by the linker when loading the DSO. We use it to
+ * do system initialization, e.g. registration of signal handlers.
+ */
+static __attribute__((constructor)) void on_dso_load_0408(void)
+{
+ register_signal_handler(SS_LCHAN, gsm0408_handle_lchan_signal, NULL);
+}
+
+static void to_bcd(u_int8_t *bcd, u_int16_t val)
+{
+ bcd[2] = val % 10;
+ val = val / 10;
+ bcd[1] = val % 10;
+ val = val / 10;
+ bcd[0] = val % 10;
+ val = val / 10;
+}
+
+void gsm0408_generate_lai(struct gsm48_loc_area_id *lai48, u_int16_t mcc,
+ u_int16_t mnc, u_int16_t lac)
+{
+ u_int8_t bcd[3];
+
+ to_bcd(bcd, mcc);
+ lai48->digits[0] = bcd[0] | (bcd[1] << 4);
+ lai48->digits[1] = bcd[2];
+
+ to_bcd(bcd, mnc);
+ /* FIXME: do we need three-digit MNC? See Table 10.5.3 */
+#if 0
+ lai48->digits[1] |= bcd[2] << 4;
+ lai48->digits[2] = bcd[0] | (bcd[1] << 4);
+#else
+ lai48->digits[1] |= 0xf << 4;
+ lai48->digits[2] = bcd[1] | (bcd[2] << 4);
+#endif
+
+ lai48->lac = htons(lac);
+}
+
+#define TMSI_LEN 5
+#define MID_TMSI_LEN (TMSI_LEN + 2)
+
+int generate_mid_from_tmsi(u_int8_t *buf, u_int32_t tmsi)
+{
+ u_int32_t *tptr = (u_int32_t *) &buf[3];
+
+ buf[0] = GSM48_IE_MOBILE_ID;
+ buf[1] = TMSI_LEN;
+ buf[2] = 0xf0 | GSM_MI_TYPE_TMSI;
+ *tptr = htonl(tmsi);
+
+ return 7;
+}
+
+static const char bcd_num_digits[] = {
+ '0', '1', '2', '3', '4', '5', '6', '7',
+ '8', '9', '*', '#', 'a', 'b', 'c', '\0'
+};
+
+/* decode a 'called party BCD number' as in 10.5.4.7 */
+u_int8_t decode_bcd_number(char *output, int output_len, const u_int8_t *bcd_lv)
+{
+ u_int8_t in_len = bcd_lv[0];
+ int i;
+
+ if (in_len < 1)
+ return 0;
+
+ for (i = 2; i <= in_len; i++) {
+ /* lower nibble */
+ output_len--;
+ if (output_len <= 1)
+ break;
+ *output++ = bcd_num_digits[bcd_lv[i] & 0xf];
+
+ /* higher nibble */
+ output_len--;
+ if (output_len <= 1)
+ break;
+ *output++ = bcd_num_digits[bcd_lv[i] >> 4];
+ }
+ if (output_len >= 1)
+ *output++ = '\0';
+
+ /* return number type / calling plan */
+ return bcd_lv[1] & 0x3f;
+}
+
+/* convert a single ASCII character to call-control BCD */
+static int asc_to_bcd(const char asc)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(bcd_num_digits); i++) {
+ if (bcd_num_digits[i] == asc)
+ return i;
+ }
+ return -EINVAL;
+}
+
+/* convert a ASCII phone number to 'called party BCD number' */
+int encode_bcd_number(u_int8_t *bcd_lv, u_int8_t max_len,
+ u_int8_t type, const char *input)
+{
+ int in_len = strlen(input);
+ int i;
+ u_int8_t *bcd_cur = bcd_lv + 2;
+
+ if (in_len/2 + 1 > max_len)
+ return -EIO;
+
+ /* two digits per byte, plus type byte */
+ bcd_lv[0] = in_len/2 + 1;
+ if (in_len % 2)
+ bcd_lv[0]++;
+
+ /* if the caller wants to create a valid 'calling party BCD
+ * number', then the extension bit MUST NOT be set. For the
+ * 'called party BCD number' it MUST be set. *sigh */
+ bcd_lv[1] = type;
+
+ for (i = 0; i < in_len; i++) {
+ int rc = asc_to_bcd(input[i]);
+ if (rc < 0)
+ return rc;
+ if (i % 2 == 0)
+ *bcd_cur = rc;
+ else
+ *bcd_cur++ |= (rc << 4);
+ }
+ /* append padding nibble in case of odd length */
+ if (i % 2)
+ *bcd_cur++ |= 0xf0;
+
+ /* return how many bytes we used */
+ return (bcd_cur - bcd_lv);
+}
+
+struct msgb *gsm48_msgb_alloc(void)
+{
+ return msgb_alloc_headroom(GSM48_ALLOC_SIZE, GSM48_ALLOC_HEADROOM);
+}
+
+int gsm48_sendmsg(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msg->data;
+
+ if (msg->lchan) {
+ msg->trx = msg->lchan->ts->trx;
+
+ if ((gh->proto_discr & GSM48_PDISC_MASK) == GSM48_PDISC_CC) {
+ /* Send a 04.08 call control message, add transaction
+ * ID and TI flag */
+ gh->proto_discr |= msg->lchan->call.transaction_id;
+
+ /* GSM 04.07 Section 11.2.3.1.3 */
+ switch (msg->lchan->call.type) {
+ case GSM_CT_MO:
+ gh->proto_discr |= 0x80;
+ break;
+ case GSM_CT_MT:
+ break;
+ case GSM_CT_NONE:
+ break;
+ }
+ }
+ }
+
+ msg->l3h = msg->data;
+
+ return rsl_data_request(msg, 0);
+}
+
+
+/* Chapter 9.2.14 : Send LOCATION UPDATING REJECT */
+int gsm0408_loc_upd_rej(struct gsm_lchan *lchan, u_int8_t cause)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+
+ msg->lchan = lchan;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_LOC_UPD_REJECT;
+ gh->data[0] = cause;
+
+ DEBUGP(DMM, "-> LOCATION UPDATING REJECT on channel: %d\n", lchan->nr);
+
+ return gsm48_sendmsg(msg);
+}
+
+/* Chapter 9.2.13 : Send LOCATION UPDATE ACCEPT */
+int gsm0408_loc_upd_acc(struct gsm_lchan *lchan, u_int32_t tmsi)
+{
+ struct gsm_bts *bts = lchan->ts->trx->bts;
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+ struct gsm48_loc_area_id *lai;
+ u_int8_t *mid;
+ int ret;
+
+ msg->lchan = lchan;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_LOC_UPD_ACCEPT;
+
+ lai = (struct gsm48_loc_area_id *) msgb_put(msg, sizeof(*lai));
+ gsm0408_generate_lai(lai, bts->network->country_code,
+ bts->network->network_code, bts->location_area_code);
+
+ mid = msgb_put(msg, MID_TMSI_LEN);
+ generate_mid_from_tmsi(mid, tmsi);
+
+ DEBUGP(DMM, "-> LOCATION UPDATE ACCEPT\n");
+
+ ret = gsm48_sendmsg(msg);
+
+ ret = gsm48_tx_mm_info(lchan);
+
+ return ret;
+}
+
+static char bcd2char(u_int8_t bcd)
+{
+ if (bcd < 0xa)
+ return '0' + bcd;
+ else
+ return 'A' + (bcd - 0xa);
+}
+
+/* Convert Mobile Identity (10.5.1.4) to string */
+static int mi_to_string(char *string, int str_len, u_int8_t *mi, int mi_len)
+{
+ int i;
+ u_int8_t mi_type;
+ char *str_cur = string;
+ u_int32_t tmsi;
+
+ mi_type = mi[0] & GSM_MI_TYPE_MASK;
+
+ switch (mi_type) {
+ case GSM_MI_TYPE_NONE:
+ break;
+ case GSM_MI_TYPE_TMSI:
+ /* Table 10.5.4.3, reverse generate_mid_from_tmsi */
+ if (mi_len == TMSI_LEN && mi[0] == (0xf0 | GSM_MI_TYPE_TMSI)) {
+ memcpy(&tmsi, &mi[1], 4);
+ tmsi = ntohl(tmsi);
+ return snprintf(string, str_len, "%u", tmsi);
+ }
+ break;
+ case GSM_MI_TYPE_IMSI:
+ case GSM_MI_TYPE_IMEI:
+ case GSM_MI_TYPE_IMEISV:
+ *str_cur++ = bcd2char(mi[0] >> 4);
+
+ for (i = 1; i < mi_len; i++) {
+ if (str_cur + 2 >= string + str_len)
+ return str_cur - string;
+ *str_cur++ = bcd2char(mi[i] & 0xf);
+ /* skip last nibble in last input byte when GSM_EVEN */
+ if( (i != mi_len-1) || (mi[0] & GSM_MI_ODD))
+ *str_cur++ = bcd2char(mi[i] >> 4);
+ }
+ break;
+ default:
+ break;
+ }
+ *str_cur++ = '\0';
+
+ return str_cur - string;
+}
+
+/* Transmit Chapter 9.2.10 Identity Request */
+static int mm_tx_identity_req(struct gsm_lchan *lchan, u_int8_t id_type)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+
+ msg->lchan = lchan;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_ID_REQ;
+ gh->data[0] = id_type;
+
+ return gsm48_sendmsg(msg);
+}
+
+#define MI_SIZE 32
+
+/* Parse Chapter 9.2.11 Identity Response */
+static int mm_rx_id_resp(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ struct gsm_lchan *lchan = msg->lchan;
+ u_int8_t mi_type = gh->data[1] & GSM_MI_TYPE_MASK;
+ char mi_string[MI_SIZE];
+
+ mi_to_string(mi_string, sizeof(mi_string), &gh->data[1], gh->data[0]);
+ DEBUGP(DMM, "IDENTITY RESPONSE: mi_type=0x%02x MI(%s)\n",
+ mi_type, mi_string);
+
+ /*
+ * Rogue messages could trick us but so is life
+ */
+ put_lchan(lchan);
+
+ switch (mi_type) {
+ case GSM_MI_TYPE_IMSI:
+ if (!lchan->subscr)
+ lchan->subscr = db_create_subscriber(mi_string);
+ if (lchan->loc_operation)
+ lchan->loc_operation->waiting_for_imsi = 0;
+ break;
+ case GSM_MI_TYPE_IMEI:
+ case GSM_MI_TYPE_IMEISV:
+ /* update subscribe <-> IMEI mapping */
+ if (lchan->subscr)
+ db_subscriber_assoc_imei(lchan->subscr, mi_string);
+ if (lchan->loc_operation)
+ lchan->loc_operation->waiting_for_imei = 0;
+ break;
+ }
+
+ /* Check if we can let the mobile station enter */
+ return gsm0408_authorize(lchan, msg);
+}
+
+
+static void loc_upd_rej_cb(void *data)
+{
+ struct gsm_lchan *lchan = data;
+
+ release_loc_updating_req(lchan);
+ gsm0408_loc_upd_rej(lchan, reject_cause);
+ lchan_auto_release(lchan);
+}
+
+static void schedule_reject(struct gsm_lchan *lchan)
+{
+ lchan->loc_operation->updating_timer.cb = loc_upd_rej_cb;
+ lchan->loc_operation->updating_timer.data = lchan;
+ bsc_schedule_timer(&lchan->loc_operation->updating_timer, 5, 0);
+}
+
+static const char *lupd_name(u_int8_t type)
+{
+ switch (type) {
+ case GSM48_LUPD_NORMAL:
+ return "NORMAL";
+ case GSM48_LUPD_PERIODIC:
+ return "PEROIDOC";
+ case GSM48_LUPD_IMSI_ATT:
+ return "IMSI ATTACH";
+ default:
+ return "UNKNOWN";
+ }
+}
+
+#define MI_SIZE 32
+/* Chapter 9.2.15: Receive Location Updating Request */
+static int mm_rx_loc_upd_req(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ struct gsm48_loc_upd_req *lu;
+ struct gsm_subscriber *subscr;
+ struct gsm_lchan *lchan = msg->lchan;
+ u_int8_t mi_type;
+ char mi_string[MI_SIZE];
+ int rc;
+
+ lu = (struct gsm48_loc_upd_req *) gh->data;
+
+ mi_type = lu->mi[0] & GSM_MI_TYPE_MASK;
+
+ mi_to_string(mi_string, sizeof(mi_string), lu->mi, lu->mi_len);
+
+ DEBUGP(DMM, "LUPDREQ: mi_type=0x%02x MI(%s) type=%s\n", mi_type, mi_string,
+ lupd_name(lu->type));
+
+ /*
+ * Pseudo Spoof detection: Just drop a second/concurrent
+ * location updating request.
+ */
+ if (lchan->loc_operation) {
+ DEBUGP(DMM, "LUPDREQ: ignoring request due an existing one: %p.\n",
+ lchan->loc_operation);
+ gsm0408_loc_upd_rej(lchan, GSM48_REJECT_PROTOCOL_ERROR);
+ return 0;
+ }
+
+ allocate_loc_updating_req(lchan);
+
+ switch (mi_type) {
+ case GSM_MI_TYPE_IMSI:
+ /* we always want the IMEI, too */
+ use_lchan(lchan);
+ rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEI);
+ lchan->loc_operation->waiting_for_imei = 1;
+
+ /* look up subscriber based on IMSI */
+ subscr = db_create_subscriber(mi_string);
+ break;
+ case GSM_MI_TYPE_TMSI:
+ /* we always want the IMEI, too */
+ use_lchan(lchan);
+ rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMEI);
+ lchan->loc_operation->waiting_for_imei = 1;
+
+ /* look up the subscriber based on TMSI, request IMSI if it fails */
+ subscr = subscr_get_by_tmsi(mi_string);
+ if (!subscr) {
+ /* send IDENTITY REQUEST message to get IMSI */
+ use_lchan(lchan);
+ rc = mm_tx_identity_req(lchan, GSM_MI_TYPE_IMSI);
+ lchan->loc_operation->waiting_for_imsi = 1;
+ }
+ break;
+ case GSM_MI_TYPE_IMEI:
+ case GSM_MI_TYPE_IMEISV:
+ /* no sim card... FIXME: what to do ? */
+ DEBUGP(DMM, "unimplemented mobile identity type\n");
+ break;
+ default:
+ DEBUGP(DMM, "unknown mobile identity type\n");
+ break;
+ }
+
+ lchan->subscr = subscr;
+
+ /*
+ * Schedule the reject timer and check if we can let the
+ * subscriber into our network immediately or if we need to wait
+ * for identity responses.
+ */
+ schedule_reject(lchan);
+ return gsm0408_authorize(lchan, msg);
+}
+
+/* 9.1.5 Channel mode modify */
+int gsm48_tx_chan_mode_modify(struct gsm_lchan *lchan, u_int8_t mode)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ struct gsm48_chan_mode_modify *cmm =
+ (struct gsm48_chan_mode_modify *) msgb_put(msg, sizeof(*cmm));
+ u_int16_t arfcn = lchan->ts->trx->arfcn & 0x3ff;
+
+ DEBUGP(DRR, "-> CHANNEL MODE MODIFY mode=0x%02x\n", mode);
+
+ lchan->tch_mode = mode;
+ msg->lchan = lchan;
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_CHAN_MODE_MODIF;
+
+ /* fill the channel information element, this code
+ * should probably be shared with rsl_rx_chan_rqd() */
+ cmm->chan_desc.chan_nr = lchan2chan_nr(lchan);
+ cmm->chan_desc.h0.tsc = lchan->ts->trx->bts->tsc;
+ cmm->chan_desc.h0.h = 0;
+ cmm->chan_desc.h0.arfcn_high = arfcn >> 8;
+ cmm->chan_desc.h0.arfcn_low = arfcn & 0xff;
+ cmm->mode = mode;
+
+ return gsm48_sendmsg(msg);
+}
+
+/* Section 9.2.15a */
+int gsm48_tx_mm_info(struct gsm_lchan *lchan)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+ struct gsm_network *net = lchan->ts->trx->bts->network;
+ u_int8_t *ptr8;
+ u_int16_t *ptr16;
+ int name_len;
+ int i;
+
+ msg->lchan = lchan;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_INFO;
+
+ if (net->name_long) {
+ name_len = strlen(net->name_long);
+ /* 10.5.3.5a */
+ ptr8 = msgb_put(msg, 3);
+ ptr8[0] = GSM48_IE_NAME_LONG;
+ ptr8[1] = name_len*2 +1;
+ ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */
+
+ ptr16 = (u_int16_t *) msgb_put(msg, name_len*2);
+ for (i = 0; i < name_len; i++)
+ ptr16[i] = htons(net->name_long[i]);
+
+ /* FIXME: Use Cell Broadcast, not UCS-2, since
+ * UCS-2 is only supported by later revisions of the spec */
+ }
+
+ if (net->name_short) {
+ name_len = strlen(net->name_short);
+ /* 10.5.3.5a */
+ ptr8 = (u_int8_t *) msgb_put(msg, 3);
+ ptr8[0] = GSM48_IE_NAME_LONG;
+ ptr8[1] = name_len*2 + 1;
+ ptr8[2] = 0x90; /* UCS2, no spare bits, no CI */
+
+ ptr16 = (u_int16_t *) msgb_put(msg, name_len*2);
+ for (i = 0; i < name_len; i++)
+ ptr16[i] = htons(net->name_short[i]);
+ }
+
+#if 0
+ /* move back to the top */
+ time_t cur_t;
+ struct tm* cur_time;
+ int tz15min;
+ /* Section 10.5.3.9 */
+ cur_t = time(NULL);
+ cur_time = gmtime(cur_t);
+ ptr8 = msgb_put(msg, 8);
+ ptr8[0] = GSM48_IE_NET_TIME_TZ;
+ ptr8[1] = to_bcd8(cur_time->tm_year % 100);
+ ptr8[2] = to_bcd8(cur_time->tm_mon);
+ ptr8[3] = to_bcd8(cur_time->tm_mday);
+ ptr8[4] = to_bcd8(cur_time->tm_hour);
+ ptr8[5] = to_bcd8(cur_time->tm_min);
+ ptr8[6] = to_bcd8(cur_time->tm_sec);
+ /* 02.42: coded as BCD encoded signed value in units of 15 minutes */
+ tz15min = (cur_time->tm_gmtoff)/(60*15);
+ ptr8[6] = to_bcd8(tz15min);
+ if (tz15min < 0)
+ ptr8[6] |= 0x80;
+#endif
+
+ return gsm48_sendmsg(msg);
+}
+
+static int gsm48_tx_mm_serv_ack(struct gsm_lchan *lchan)
+{
+ DEBUGP(DMM, "-> CM SERVICE ACK\n");
+ return gsm48_tx_simple(lchan, GSM48_PDISC_MM, GSM48_MT_MM_CM_SERV_ACC);
+}
+
+/* 9.2.6 CM service reject */
+static int gsm48_tx_mm_serv_rej(struct gsm_lchan *lchan,
+ enum gsm48_reject_value value)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh) + 1);
+
+ msg->lchan = lchan;
+ use_lchan(lchan);
+
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_CM_SERV_REJ;
+ gh->data[0] = value;
+ DEBUGP(DMM, "-> CM SERVICE Reject cause: %d\n", value);
+
+ return gsm48_sendmsg(msg);
+}
+
+
+/*
+ * Handle CM Service Requests
+ * a) Verify that the packet is long enough to contain the information
+ * we require otherwsie reject with INCORRECT_MESSAGE
+ * b) Try to parse the TMSI. If we do not have one reject
+ * c) Check that we know the subscriber with the TMSI otherwise reject
+ * with a HLR cause
+ * d) Set the subscriber on the gsm_lchan and accept
+ */
+static int gsm48_rx_mm_serv_req(struct msgb *msg)
+{
+ u_int8_t mi_type;
+ char mi_string[MI_SIZE];
+
+ struct gsm_subscriber *subscr;
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ struct gsm48_service_request *req =
+ (struct gsm48_service_request *)gh->data;
+ /* unfortunately in Phase1 the classmar2 length is variable */
+ u_int8_t classmark2_len = gh->data[1];
+ u_int8_t *classmark2 = gh->data+2;
+ u_int8_t mi_len = *(classmark2 + classmark2_len);
+ u_int8_t *mi = (classmark2 + classmark2_len + 1);
+
+ DEBUGP(DMM, "<- CM SERVICE REQUEST ");
+ if (msg->data_len < sizeof(struct gsm48_service_request*)) {
+ DEBUGPC(DMM, "wrong sized message\n");
+ return gsm48_tx_mm_serv_rej(msg->lchan,
+ GSM48_REJECT_INCORRECT_MESSAGE);
+ }
+
+ if (msg->data_len < req->mi_len + 6) {
+ DEBUGPC(DMM, "does not fit in packet\n");
+ return gsm48_tx_mm_serv_rej(msg->lchan,
+ GSM48_REJECT_INCORRECT_MESSAGE);
+ }
+
+ mi_type = mi[0] & GSM_MI_TYPE_MASK;
+ if (mi_type != GSM_MI_TYPE_TMSI) {
+ DEBUGPC(DMM, "mi_type is not TMSI: %d\n", mi_type);
+ return gsm48_tx_mm_serv_rej(msg->lchan,
+ GSM48_REJECT_INCORRECT_MESSAGE);
+ }
+
+ mi_to_string(mi_string, sizeof(mi_string), mi, mi_len);
+ DEBUGPC(DMM, "serv_type=0x%02x mi_type=0x%02x M(%s)\n",
+ req->cm_service_type, mi_type, mi_string);
+
+ subscr = subscr_get_by_tmsi(mi_string);
+
+ /* FIXME: if we don't know the TMSI, inquire abit IMSI and allocate new TMSI */
+ if (!subscr)
+ return gsm48_tx_mm_serv_rej(msg->lchan,
+ GSM48_REJECT_IMSI_UNKNOWN_IN_HLR);
+
+ if (!msg->lchan->subscr)
+ msg->lchan->subscr = subscr;
+ else if (msg->lchan->subscr != subscr) {
+ DEBUGP(DMM, "<- CM Channel already owned by someone else?\n");
+ subscr_put(subscr);
+ }
+
+ subscr->classmark2_len = classmark2_len;
+ memcpy(subscr->classmark2, classmark2, classmark2_len);
+
+ return gsm48_tx_mm_serv_ack(msg->lchan);
+}
+
+static int gsm48_rx_mm_imsi_detach_ind(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ struct gsm48_imsi_detach_ind *idi =
+ (struct gsm48_imsi_detach_ind *) gh->data;
+ u_int8_t mi_type = idi->mi[0] & GSM_MI_TYPE_MASK;
+ char mi_string[MI_SIZE];
+ struct gsm_subscriber *subscr;
+
+ mi_to_string(mi_string, sizeof(mi_string), idi->mi, idi->mi_len);
+ DEBUGP(DMM, "IMSI DETACH INDICATION: mi_type=0x%02x MI(%s): ",
+ mi_type, mi_string);
+
+ switch (mi_type) {
+ case GSM_MI_TYPE_TMSI:
+ subscr = subscr_get_by_tmsi(mi_string);
+ break;
+ case GSM_MI_TYPE_IMSI:
+ subscr = subscr_get_by_imsi(mi_string);
+ break;
+ case GSM_MI_TYPE_IMEI:
+ case GSM_MI_TYPE_IMEISV:
+ /* no sim card... FIXME: what to do ? */
+ DEBUGPC(DMM, "unimplemented mobile identity type\n");
+ break;
+ default:
+ DEBUGPC(DMM, "unknown mobile identity type\n");
+ break;
+ }
+
+ if (subscr) {
+ subscr_update(subscr, msg->trx->bts,
+ GSM_SUBSCRIBER_UPDATE_DETACHED);
+ DEBUGP(DMM, "Subscriber: %s\n",
+ subscr->name ? subscr->name : subscr->imsi);
+ subscr_put(subscr);
+ } else
+ DEBUGP(DMM, "Unknown Subscriber ?!?\n");
+
+ put_lchan(msg->lchan);
+
+ return 0;
+}
+
+static int gsm48_rx_mm_status(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+
+ DEBUGP(DMM, "MM STATUS (reject cause 0x%02x)\n", gh->data[0]);
+
+ return 0;
+}
+
+/* Receive a GSM 04.08 Mobility Management (MM) message */
+static int gsm0408_rcv_mm(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ int rc;
+
+ switch (gh->msg_type & 0xbf) {
+ case GSM48_MT_MM_LOC_UPD_REQUEST:
+ DEBUGP(DMM, "LOCATION UPDATING REQUEST\n");
+ rc = mm_rx_loc_upd_req(msg);
+ break;
+ case GSM48_MT_MM_ID_RESP:
+ rc = mm_rx_id_resp(msg);
+ break;
+ case GSM48_MT_MM_CM_SERV_REQ:
+ rc = gsm48_rx_mm_serv_req(msg);
+ break;
+ case GSM48_MT_MM_STATUS:
+ rc = gsm48_rx_mm_status(msg);
+ break;
+ case GSM48_MT_MM_TMSI_REALL_COMPL:
+ DEBUGP(DMM, "TMSI Reallocation Completed. Subscriber: %s\n",
+ msg->lchan->subscr ?
+ msg->lchan->subscr->imsi :
+ "unknown subscriber");
+ break;
+ case GSM48_MT_MM_IMSI_DETACH_IND:
+ rc = gsm48_rx_mm_imsi_detach_ind(msg);
+ break;
+ case GSM48_MT_MM_CM_REEST_REQ:
+ DEBUGP(DMM, "CM REESTABLISH REQUEST: Not implemented\n");
+ break;
+ case GSM48_MT_MM_AUTH_RESP:
+ DEBUGP(DMM, "AUTHENTICATION RESPONSE: Not implemented\n");
+ break;
+ default:
+ fprintf(stderr, "Unknown GSM 04.08 MM msg type 0x%02x\n",
+ gh->msg_type);
+ break;
+ }
+
+ return rc;
+}
+
+/* Receive a PAGING RESPONSE message from the MS */
+static int gsm48_rr_rx_pag_resp(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ u_int8_t *classmark2_lv = gh->data + 1;
+ u_int8_t *mi_lv = gh->data + 2 + *classmark2_lv;
+ u_int8_t mi_type = mi_lv[1] & GSM_MI_TYPE_MASK;
+ char mi_string[MI_SIZE];
+ struct gsm_subscriber *subscr;
+ struct paging_signal_data sig_data;
+ int rc = 0;
+
+ mi_to_string(mi_string, sizeof(mi_string), mi_lv+1, *mi_lv);
+ DEBUGP(DRR, "PAGING RESPONSE: mi_type=0x%02x MI(%s)\n",
+ mi_type, mi_string);
+ switch (mi_type) {
+ case GSM_MI_TYPE_TMSI:
+ subscr = subscr_get_by_tmsi(mi_string);
+ break;
+ case GSM_MI_TYPE_IMSI:
+ subscr = subscr_get_by_imsi(mi_string);
+ break;
+ }
+
+ if (!subscr) {
+ DEBUGP(DRR, "<- Can't find any subscriber for this ID\n");
+ /* FIXME: request id? close channel? */
+ return -EINVAL;
+ }
+ DEBUGP(DRR, "<- Channel was requested by %s\n",
+ subscr->name ? subscr->name : subscr->imsi);
+
+ subscr->classmark2_len = *classmark2_lv;
+ memcpy(subscr->classmark2, classmark2_lv+1, *classmark2_lv);
+
+ if (!msg->lchan->subscr) {
+ msg->lchan->subscr = subscr;
+ } else if (msg->lchan->subscr != subscr) {
+ DEBUGP(DRR, "<- Channel already owned by someone else?\n");
+ subscr_put(subscr);
+ return -EINVAL;
+ } else {
+ DEBUGP(DRR, "<- Channel already owned by us\n");
+ subscr_put(subscr);
+ subscr = msg->lchan->subscr;
+ }
+
+ sig_data.subscr = subscr;
+ sig_data.bts = msg->lchan->ts->trx->bts;
+ sig_data.lchan = msg->lchan;
+
+ dispatch_signal(SS_PAGING, S_PAGING_COMPLETED, &sig_data);
+ paging_request_stop(msg->trx->bts, subscr, msg->lchan);
+
+ /* FIXME: somehow signal the completion of the PAGING to
+ * the entity that requested the paging */
+
+ return rc;
+}
+
+static int gsm48_rx_rr_classmark(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ struct gsm_subscriber *subscr = msg->lchan->subscr;
+ unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
+ u_int8_t cm2_len, cm3_len = 0;
+ u_int8_t *cm2, *cm3 = NULL;
+
+ DEBUGP(DRR, "CLASSMARK CHANGE ");
+
+ /* classmark 2 */
+ cm2_len = gh->data[0];
+ cm2 = &gh->data[1];
+ DEBUGPC(DRR, "CM2(len=%u) ", cm2_len);
+
+ if (payload_len > cm2_len + 1) {
+ /* we must have a classmark3 */
+ if (gh->data[cm2_len+1] != 0x20) {
+ DEBUGPC(DRR, "ERR CM3 TAG\n");
+ return -EINVAL;
+ }
+ if (cm2_len > 3) {
+ DEBUGPC(DRR, "CM2 too long!\n");
+ return -EINVAL;
+ }
+
+ cm3_len = gh->data[cm2_len+2];
+ cm3 = &gh->data[cm2_len+3];
+ if (cm3_len > 14) {
+ DEBUGPC(DRR, "CM3 len %u too long!\n", cm3_len);
+ return -EINVAL;
+ }
+ DEBUGPC(DRR, "CM3(len=%u)\n", cm3_len);
+ }
+ if (subscr) {
+ subscr->classmark2_len = cm2_len;
+ memcpy(subscr->classmark2, cm2, cm2_len);
+ if (cm3) {
+ subscr->classmark3_len = cm3_len;
+ memcpy(subscr->classmark3, cm3, cm3_len);
+ }
+ }
+
+ /* FIXME: store the classmark2/3 values with the equipment register */
+
+ return 0;
+}
+
+static int gsm48_rx_rr_status(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+
+ DEBUGP(DRR, "STATUS rr_cause = %s\n",
+ rr_cause_name(gh->data[0]));
+
+ return 0;
+}
+
+static int gsm48_rx_rr_meas_rep(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
+ static struct gsm_meas_rep meas_rep;
+
+ DEBUGP(DRR, "MEASUREMENT REPORT ");
+ parse_meas_rep(&meas_rep, gh->data, payload_len);
+ if (meas_rep.flags & MEAS_REP_F_DTX)
+ DEBUGPC(DRR, "DTX ");
+ if (meas_rep.flags & MEAS_REP_F_BA1)
+ DEBUGPC(DRR, "BA1 ");
+ if (!(meas_rep.flags & MEAS_REP_F_VALID))
+ DEBUGPC(DRR, "NOT VALID ");
+ else
+ DEBUGPC(DRR, "FULL(lev=%u, qual=%u) SUB(lev=%u, qual=%u) ",
+ meas_rep.rxlev_full, meas_rep.rxqual_full, meas_rep.rxlev_sub,
+ meas_rep.rxqual_sub);
+
+ DEBUGPC(DRR, "NUM_NEIGH=%u\n", meas_rep.num_cell);
+
+ /* FIXME: put the results somwhere */
+
+ return 0;
+}
+
+/* Receive a GSM 04.08 Radio Resource (RR) message */
+static int gsm0408_rcv_rr(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ int rc = 0;
+
+ switch (gh->msg_type) {
+ case GSM48_MT_RR_CLSM_CHG:
+ rc = gsm48_rx_rr_classmark(msg);
+ break;
+ case GSM48_MT_RR_GPRS_SUSP_REQ:
+ DEBUGP(DRR, "GRPS SUSPEND REQUEST\n");
+ break;
+ case GSM48_MT_RR_PAG_RESP:
+ rc = gsm48_rr_rx_pag_resp(msg);
+ break;
+ case GSM48_MT_RR_CHAN_MODE_MODIF_ACK:
+ DEBUGP(DRR, "CHANNEL MODE MODIFY ACK\n");
+ rc = rsl_chan_mode_modify_req(msg->lchan);
+ break;
+ case GSM48_MT_RR_STATUS:
+ rc = gsm48_rx_rr_status(msg);
+ break;
+ case GSM48_MT_RR_MEAS_REP:
+ rc = gsm48_rx_rr_meas_rep(msg);
+ break;
+ default:
+ fprintf(stderr, "Unimplemented GSM 04.08 RR msg type 0x%02x\n",
+ gh->msg_type);
+ break;
+ }
+
+ return rc;
+}
+
+/* 7.1.7 and 9.1.7 Channel release*/
+int gsm48_send_rr_release(struct gsm_lchan *lchan)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ u_int8_t *cause;
+
+ msg->lchan = lchan;
+ gh->proto_discr = GSM48_PDISC_RR;
+ gh->msg_type = GSM48_MT_RR_CHAN_REL;
+
+ cause = msgb_put(msg, 1);
+ cause[0] = GSM48_RR_CAUSE_NORMAL;
+
+ DEBUGP(DRR, "Sending Channel Release: Chan: Number: %d Type: %d\n",
+ lchan->nr, lchan->type);
+
+ return gsm48_sendmsg(msg);
+}
+
+/* Call Control */
+
+/* The entire call control code is written in accordance with Figure 7.10c
+ * for 'very early assignment', i.e. we allocate a TCH/F during IMMEDIATE
+ * ASSIGN, then first use that TCH/F for signalling and later MODE MODIFY
+ * it for voice */
+
+static int gsm48_cc_tx_status(struct gsm_lchan *lchan)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+ u_int8_t *cause, *call_state;
+
+ gh->proto_discr = GSM48_PDISC_CC;
+
+ msg->lchan = lchan;
+
+ gh->msg_type = GSM48_MT_CC_STATUS;
+
+ cause = msgb_put(msg, 3);
+ cause[0] = 2;
+ cause[1] = GSM48_CAUSE_CS_GSM | GSM48_CAUSE_LOC_USER;
+ cause[2] = 0x80 | 30; /* response to status inquiry */
+
+ call_state = msgb_put(msg, 1);
+ call_state[0] = 0xc0 | 0x00;
+
+ return gsm48_sendmsg(msg);
+}
+
+static int gsm48_tx_simple(struct gsm_lchan *lchan,
+ u_int8_t pdisc, u_int8_t msg_type)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+
+ msg->lchan = lchan;
+
+ gh->proto_discr = pdisc;
+ gh->msg_type = msg_type;
+
+ return gsm48_sendmsg(msg);
+}
+
+/* call-back from paging the B-end of the connection */
+static int setup_trig_pag_evt(unsigned int hooknum, unsigned int event,
+ struct msgb *msg, void *_lchan, void *param)
+{
+ struct gsm_lchan *lchan = _lchan;
+ struct gsm_call *remote_call = param;
+ struct gsm_call *call = &lchan->call;
+ int rc = 0;
+
+ if (hooknum != GSM_HOOK_RR_PAGING)
+ return -EINVAL;
+
+ switch (event) {
+ case GSM_PAGING_SUCCEEDED:
+ DEBUGP(DCC, "paging succeeded!\n");
+ remote_call->remote_lchan = lchan;
+ call->remote_lchan = remote_call->local_lchan;
+ /* send SETUP request to called party */
+ rc = gsm48_cc_tx_setup(lchan, call->remote_lchan->subscr);
+ if (is_ipaccess_bts(lchan->ts->trx->bts))
+ rsl_ipacc_bind(lchan);
+ break;
+ case GSM_PAGING_EXPIRED:
+ DEBUGP(DCC, "paging expired!\n");
+ /* notify caller that we cannot reach called party */
+ /* FIXME: correct cause, etc */
+ rc = gsm48_tx_simple(remote_call->local_lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_RELEASE_COMPL);
+ break;
+ }
+ return rc;
+}
+
+static int gsm48_cc_rx_status_enq(struct msgb *msg)
+{
+ DEBUGP(DCC, "-> STATUS ENQ\n");
+ return gsm48_cc_tx_status(msg->lchan);
+}
+
+static int gsm48_cc_rx_setup(struct msgb *msg)
+{
+ struct gsm_call *call = &msg->lchan->call;
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ unsigned int payload_len = msgb_l3len(msg) - sizeof(*gh);
+ struct gsm_subscriber *called_subscr;
+ char called_number[(43-2)*2 + 1] = "\0";
+ struct tlv_parsed tp;
+ u_int8_t num_type;
+ int ret;
+
+ if (call->state == GSM_CSTATE_NULL ||
+ call->state == GSM_CSTATE_RELEASE_REQ)
+ use_lchan(msg->lchan);
+
+ call->type = GSM_CT_MO;
+ call->state = GSM_CSTATE_INITIATED;
+ call->local_lchan = msg->lchan;
+ call->transaction_id = gh->proto_discr & 0xf0;
+
+ tlv_parse(&tp, &rsl_att_tlvdef, gh->data, payload_len, 0, 0);
+ if (!TLVP_PRESENT(&tp, GSM48_IE_CALLED_BCD))
+ goto err;
+
+ /* Parse the number that was dialed and lookup subscriber */
+ num_type = decode_bcd_number(called_number, sizeof(called_number),
+ TLVP_VAL(&tp, GSM48_IE_CALLED_BCD)-1);
+
+ DEBUGP(DCC, "A -> SETUP(tid=0x%02x,number='%s')\n", call->transaction_id,
+ called_number);
+
+ called_subscr = subscr_get_by_extension(called_number);
+ if (!called_subscr) {
+ DEBUGP(DCC, "could not find subscriber, RELEASE\n");
+ put_lchan(msg->lchan);
+ return gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_RELEASE_COMPL);
+ }
+ if (called_subscr == msg->lchan->subscr) {
+ DEBUGP(DCC, "subscriber calling himself ?!?\n");
+ put_lchan(msg->lchan);
+ subscr_put(called_subscr);
+ return gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_RELEASE_COMPL);
+ }
+
+ subscr_get(msg->lchan->subscr);
+ call->called_subscr = called_subscr;
+
+ /* start paging of the receiving end of the call */
+ /* FIXME: we're assuming that the receiver is at the same BTS
+ * than we are, which is obviously a wrong assumption in multi-BTS
+ * case */
+ paging_request(msg->trx->bts, called_subscr, RSL_CHANNEED_TCH_F,
+ setup_trig_pag_evt, call);
+
+ /* send a CALL PROCEEDING message to the MO */
+ ret = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_CALL_PROC);
+
+ if (is_ipaccess_bts(msg->trx->bts))
+ rsl_ipacc_bind(msg->lchan);
+
+ /* change TCH/F mode to voice */
+ return gsm48_tx_chan_mode_modify(msg->lchan, GSM48_CMODE_SPEECH_EFR);
+
+err:
+ /* FIXME: send some kind of RELEASE */
+ return 0;
+}
+
+static int gsm48_cc_rx_alerting(struct msgb *msg)
+{
+ struct gsm_call *call = &msg->lchan->call;
+
+ DEBUGP(DCC, "A -> ALERTING\n");
+
+ /* forward ALERTING to other party */
+ if (!call->remote_lchan)
+ return -EIO;
+
+ DEBUGP(DCC, "B <- ALERTING\n");
+ return gsm48_tx_simple(call->remote_lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_ALERTING);
+}
+
+/* map two ipaccess RTP streams onto each other */
+static int tch_map(struct gsm_lchan *lchan, struct gsm_lchan *remote_lchan)
+{
+ struct gsm_bts *bts = lchan->ts->trx->bts;
+ struct gsm_bts *remote_bts = remote_lchan->ts->trx->bts;
+ struct gsm_bts_trx_ts *ts;
+
+ DEBUGP(DCC, "Setting up TCH map between (bts=%u,trx=%u,ts=%u) and (bts=%u,trx=%u,ts=%u)\n",
+ bts->nr, lchan->ts->trx->nr, lchan->ts->nr,
+ remote_bts->nr, remote_lchan->ts->trx->nr, remote_lchan->ts->nr);
+
+ if (bts->type != remote_bts->type) {
+ DEBUGP(DCC, "Cannot switch calls between different BTS types yet\n");
+ return -EINVAL;
+ }
+
+ switch (bts->type) {
+ case GSM_BTS_TYPE_NANOBTS_900:
+ case GSM_BTS_TYPE_NANOBTS_1800:
+ ts = remote_lchan->ts;
+ rsl_ipacc_connect(lchan, ts->abis_ip.bound_ip, ts->abis_ip.bound_port,
+ lchan->ts->abis_ip.attr_f8, ts->abis_ip.attr_fc);
+
+ ts = lchan->ts;
+ rsl_ipacc_connect(remote_lchan, ts->abis_ip.bound_ip, ts->abis_ip.bound_port,
+ remote_lchan->ts->abis_ip.attr_f8, ts->abis_ip.attr_fc);
+ break;
+ case GSM_BTS_TYPE_BS11:
+ trau_mux_map_lchan(lchan, remote_lchan);
+ break;
+ default:
+ DEBUGP(DCC, "Unknown BTS type %u\n", bts->type);
+ break;
+ }
+
+ return 0;
+}
+
+static int gsm48_cc_rx_connect(struct msgb *msg)
+{
+ struct gsm_call *call = &msg->lchan->call;
+ int rc;
+
+ DEBUGP(DCC, "A -> CONNECT\n");
+
+ rc = tch_map(msg->lchan, call->remote_lchan);
+ if (rc)
+ return -EIO;
+
+ if (!call->remote_lchan)
+ return -EIO;
+
+ DEBUGP(DCC, "A <- CONNECT ACK\n");
+ /* MT+MO: need to respond with CONNECT_ACK and pass on */
+ rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_CONNECT_ACK);
+
+
+ /* forward CONNECT to other party */
+ DEBUGP(DCC, "B <- CONNECT\n");
+ return gsm48_tx_simple(call->remote_lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_CONNECT);
+}
+
+static int gsm48_cc_rx_disconnect(struct msgb *msg)
+{
+ struct gsm_call *call = &msg->lchan->call;
+ int rc;
+
+
+ /* Section 5.4.3.2 */
+ DEBUGP(DCC, "A -> DISCONNECT (state->RELEASE_REQ)\n");
+ call->state = GSM_CSTATE_RELEASE_REQ;
+ /* FIXME: clear the network connection */
+ DEBUGP(DCC, "A <- RELEASE\n");
+ rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_RELEASE);
+
+ /*
+ * FIXME: This looks wrong! We should have a single
+ * place to do MMCC-REL-CNF/-REQ/-IND and then switch
+ * to the NULL state and relase the call
+ */
+ subscr_put_channel(msg->lchan);
+
+ /* forward DISCONNECT to other party */
+ if (!call->remote_lchan)
+ return -EIO;
+
+ DEBUGP(DCC, "B <- DISCONNECT\n");
+ return gsm48_tx_simple(call->remote_lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_DISCONNECT);
+}
+
+static const u_int8_t calling_bcd[] = { 0xb9, 0x32, 0x24 };
+
+int gsm48_cc_tx_setup(struct gsm_lchan *lchan,
+ struct gsm_subscriber *calling_subscr)
+{
+ struct msgb *msg = gsm48_msgb_alloc();
+ struct gsm48_hdr *gh;
+ struct gsm_call *call = &lchan->call;
+ u_int8_t bcd_lv[19];
+
+ gh = (struct gsm48_hdr *) msgb_put(msg, sizeof(*gh));
+
+ call->type = GSM_CT_MT;
+
+ call->local_lchan = msg->lchan = lchan;
+ use_lchan(lchan);
+
+ gh->proto_discr = GSM48_PDISC_CC;
+ gh->msg_type = GSM48_MT_CC_SETUP;
+
+ msgb_tv_put(msg, GSM48_IE_SIGNAL, GSM48_SIGNAL_DIALTONE);
+ if (calling_subscr) {
+ encode_bcd_number(bcd_lv, sizeof(bcd_lv), 0xb9,
+ calling_subscr->extension);
+ msgb_tlv_put(msg, GSM48_IE_CALLING_BCD,
+ bcd_lv[0], bcd_lv+1);
+ }
+ if (lchan->subscr) {
+ encode_bcd_number(bcd_lv, sizeof(bcd_lv), 0xb9,
+ lchan->subscr->extension);
+ msgb_tlv_put(msg, GSM48_IE_CALLED_BCD,
+ bcd_lv[0], bcd_lv+1);
+ }
+
+ DEBUGP(DCC, "B <- SETUP\n");
+
+ return gsm48_sendmsg(msg);
+}
+
+static int gsm0408_rcv_cc(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ u_int8_t msg_type = gh->msg_type & 0xbf;
+ struct gsm_call *call = &msg->lchan->call;
+ int rc = 0;
+
+ switch (msg_type) {
+ case GSM48_MT_CC_CALL_CONF:
+ /* Response to SETUP */
+ DEBUGP(DCC, "-> CALL CONFIRM\n");
+ /* we now need to MODIFY the channel */
+ rc = gsm48_tx_chan_mode_modify(msg->lchan, GSM48_CMODE_SPEECH_EFR);
+ break;
+ case GSM48_MT_CC_RELEASE_COMPL:
+ /* Answer from MS to RELEASE */
+ DEBUGP(DCC, "-> RELEASE COMPLETE (state->NULL)\n");
+ call->state = GSM_CSTATE_NULL;
+ break;
+ case GSM48_MT_CC_ALERTING:
+ rc = gsm48_cc_rx_alerting(msg);
+ break;
+ case GSM48_MT_CC_CONNECT:
+ rc = gsm48_cc_rx_connect(msg);
+ break;
+ case GSM48_MT_CC_CONNECT_ACK:
+ /* MO: Answer to CONNECT */
+ call->state = GSM_CSTATE_ACTIVE;
+ DEBUGP(DCC, "-> CONNECT_ACK (state->ACTIVE)\n");
+ break;
+ case GSM48_MT_CC_RELEASE:
+ DEBUGP(DCC, "-> RELEASE\n");
+ DEBUGP(DCC, "<- RELEASE_COMPLETE\n");
+ /* need to respond with RELEASE_COMPLETE */
+ rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_RELEASE_COMPL);
+ subscr_put_channel(msg->lchan);
+ call->state = GSM_CSTATE_NULL;
+ break;
+ case GSM48_MT_CC_STATUS_ENQ:
+ rc = gsm48_cc_rx_status_enq(msg);
+ break;
+ case GSM48_MT_CC_DISCONNECT:
+ rc = gsm48_cc_rx_disconnect(msg);
+ break;
+ case GSM48_MT_CC_SETUP:
+ /* MO: wants to establish a call */
+ rc = gsm48_cc_rx_setup(msg);
+ break;
+ case GSM48_MT_CC_EMERG_SETUP:
+ DEBUGP(DCC, "-> EMERGENCY SETUP\n");
+ /* FIXME: continue with CALL_PROCEEDING, ALERTING, CONNECT, RELEASE_COMPLETE */
+ break;
+ case GSM48_MT_CC_HOLD:
+ DEBUGP(DCC, "-> HOLD (rejecting)\n");
+ rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_HOLD_REJ);
+ break;
+ case GSM48_MT_CC_RETR:
+ DEBUGP(DCC, "-> RETR (rejecting)\n");
+ rc = gsm48_tx_simple(msg->lchan, GSM48_PDISC_CC,
+ GSM48_MT_CC_RETR_REJ);
+ break;
+ default:
+ fprintf(stderr, "Unimplemented GSM 04.08 CC msg type 0x%02x\n",
+ msg_type);
+ break;
+ }
+
+ return rc;
+}
+
+/* here we pass in a msgb from the RSL->RLL. We expect the l3 pointer to be set */
+int gsm0408_rcvmsg(struct msgb *msg)
+{
+ struct gsm48_hdr *gh = msgb_l3(msg);
+ u_int8_t pdisc = gh->proto_discr & 0x0f;
+ int rc = 0;
+
+ switch (pdisc) {
+ case GSM48_PDISC_CC:
+ rc = gsm0408_rcv_cc(msg);
+ break;
+ case GSM48_PDISC_MM:
+ rc = gsm0408_rcv_mm(msg);
+ break;
+ case GSM48_PDISC_RR:
+ rc = gsm0408_rcv_rr(msg);
+ break;
+ case GSM48_PDISC_SMS:
+ rc = gsm0411_rcv_sms(msg);
+ break;
+ case GSM48_PDISC_MM_GPRS:
+ case GSM48_PDISC_SM_GPRS:
+ fprintf(stderr, "Unimplemented GSM 04.08 discriminator 0x%02d\n",
+ pdisc);
+ break;
+ default:
+ fprintf(stderr, "Unknown GSM 04.08 discriminator 0x%02d\n",
+ pdisc);
+ break;
+ }
+
+ return rc;
+}
+
+enum chreq_type {
+ CHREQ_T_EMERG_CALL,
+ CHREQ_T_CALL_REEST_TCH_F,
+ CHREQ_T_CALL_REEST_TCH_H,
+ CHREQ_T_CALL_REEST_TCH_H_DBL,
+ CHREQ_T_SDCCH,
+ CHREQ_T_TCH_F,
+ CHREQ_T_VOICE_CALL_TCH_H,
+ CHREQ_T_DATA_CALL_TCH_H,
+ CHREQ_T_LOCATION_UPD,
+ CHREQ_T_PAG_R_ANY,
+ CHREQ_T_PAG_R_TCH_F,
+ CHREQ_T_PAG_R_TCH_FH,
+};
+
+/* Section 9.1.8 / Table 9.9 */
+struct chreq {
+ u_int8_t val;
+ u_int8_t mask;
+ enum chreq_type type;
+};
+
+/* If SYSTEM INFORMATION TYPE 4 NECI bit == 1 */
+static const struct chreq chreq_type_neci1[] = {
+ { 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
+ { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_F },
+ { 0x68, 0xfc, CHREQ_T_CALL_REEST_TCH_H },
+ { 0x6c, 0xfc, CHREQ_T_CALL_REEST_TCH_H_DBL },
+ { 0xe0, 0xe0, CHREQ_T_SDCCH },
+ { 0x40, 0xf0, CHREQ_T_VOICE_CALL_TCH_H },
+ { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
+ { 0x00, 0xf0, CHREQ_T_LOCATION_UPD },
+ { 0x10, 0xf0, CHREQ_T_SDCCH },
+ { 0x80, 0xe0, CHREQ_T_PAG_R_ANY },
+ { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
+ { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
+};
+
+/* If SYSTEM INFORMATION TYPE 4 NECI bit == 0 */
+static const struct chreq chreq_type_neci0[] = {
+ { 0xa0, 0xe0, CHREQ_T_EMERG_CALL },
+ { 0xc0, 0xe0, CHREQ_T_CALL_REEST_TCH_H },
+ { 0xe0, 0xe0, CHREQ_T_TCH_F },
+ { 0x50, 0xf0, CHREQ_T_DATA_CALL_TCH_H },
+ { 0x00, 0xe0, CHREQ_T_LOCATION_UPD },
+ { 0x80, 0xe0, CHREQ_T_PAG_R_ANY },
+ { 0x20, 0xf0, CHREQ_T_PAG_R_TCH_F },
+ { 0x30, 0xf0, CHREQ_T_PAG_R_TCH_FH },
+};
+
+static const enum gsm_chan_t ctype_by_chreq[] = {
+ [CHREQ_T_EMERG_CALL] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_CALL_REEST_TCH_F] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_CALL_REEST_TCH_H] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_SDCCH] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_TCH_F] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_VOICE_CALL_TCH_H] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_DATA_CALL_TCH_H] = GSM_LCHAN_TCH_H,
+ [CHREQ_T_LOCATION_UPD] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_PAG_R_ANY] = GSM_LCHAN_SDCCH,
+ [CHREQ_T_PAG_R_TCH_F] = GSM_LCHAN_TCH_F,
+ [CHREQ_T_PAG_R_TCH_FH] = GSM_LCHAN_TCH_F,
+};
+
+static const enum gsm_chreq_reason_t reason_by_chreq[] = {
+ [CHREQ_T_EMERG_CALL] = GSM_CHREQ_REASON_EMERG,
+ [CHREQ_T_CALL_REEST_TCH_F] = GSM_CHREQ_REASON_CALL,
+ [CHREQ_T_CALL_REEST_TCH_H] = GSM_CHREQ_REASON_CALL,
+ [CHREQ_T_CALL_REEST_TCH_H_DBL] = GSM_CHREQ_REASON_CALL,
+ [CHREQ_T_SDCCH] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_TCH_F] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_VOICE_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_DATA_CALL_TCH_H] = GSM_CHREQ_REASON_OTHER,
+ [CHREQ_T_LOCATION_UPD] = GSM_CHREQ_REASON_LOCATION_UPD,
+ [CHREQ_T_PAG_R_ANY] = GSM_CHREQ_REASON_PAG,
+ [CHREQ_T_PAG_R_TCH_F] = GSM_CHREQ_REASON_PAG,
+ [CHREQ_T_PAG_R_TCH_FH] = GSM_CHREQ_REASON_PAG,
+};
+
+enum gsm_chan_t get_ctype_by_chreq(struct gsm_bts *bts, u_int8_t ra)
+{
+ int i;
+ /* FIXME: determine if we set NECI = 0 in the BTS SI4 */
+
+ for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) {
+ const struct chreq *chr = &chreq_type_neci0[i];
+ if ((ra & chr->mask) == chr->val)
+ return ctype_by_chreq[chr->type];
+ }
+ fprintf(stderr, "Unknown CHANNEL REQUEST RQD 0x%02x\n", ra);
+ return GSM_LCHAN_SDCCH;
+}
+
+enum gsm_chreq_reason_t get_reason_by_chreq(struct gsm_bts *bts, u_int8_t ra)
+{
+ int i;
+ /* FIXME: determine if we set NECI = 0 in the BTS SI4 */
+
+ for (i = 0; i < ARRAY_SIZE(chreq_type_neci0); i++) {
+ const struct chreq *chr = &chreq_type_neci0[i];
+ if ((ra & chr->mask) == chr->val)
+ return reason_by_chreq[chr->type];
+ }
+ fprintf(stderr, "Unknown CHANNEL REQUEST REASON 0x%02x\n", ra);
+ return GSM_CHREQ_REASON_OTHER;
+}