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-rw-r--r--src/libbsc/abis_rsl.c1971
1 files changed, 1971 insertions, 0 deletions
diff --git a/src/libbsc/abis_rsl.c b/src/libbsc/abis_rsl.c
new file mode 100644
index 00000000..9a4dc5b4
--- /dev/null
+++ b/src/libbsc/abis_rsl.c
@@ -0,0 +1,1971 @@
+/* GSM Radio Signalling Link messages on the A-bis interface
+ * 3GPP TS 08.58 version 8.6.0 Release 1999 / ETSI TS 100 596 V8.6.0 */
+
+/* (C) 2008-2010 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include <openbsc/gsm_data.h>
+#include <openbsc/gsm_04_08.h>
+#include <osmocore/gsm_utils.h>
+#include <openbsc/abis_rsl.h>
+#include <openbsc/chan_alloc.h>
+#include <openbsc/bsc_rll.h>
+#include <openbsc/debug.h>
+#include <osmocore/tlv.h>
+#include <openbsc/paging.h>
+#include <openbsc/signal.h>
+#include <openbsc/meas_rep.h>
+#include <openbsc/rtp_proxy.h>
+#include <osmocore/rsl.h>
+
+#include <osmocore/talloc.h>
+
+#define RSL_ALLOC_SIZE 1024
+#define RSL_ALLOC_HEADROOM 128
+
+#define MAX(a, b) (a) >= (b) ? (a) : (b)
+
+static int rsl_send_imm_assignment(struct gsm_lchan *lchan);
+
+static void send_lchan_signal(int sig_no, struct gsm_lchan *lchan,
+ struct gsm_meas_rep *resp)
+{
+ struct lchan_signal_data sig;
+ sig.lchan = lchan;
+ sig.mr = resp;
+ dispatch_signal(SS_LCHAN, sig_no, &sig);
+}
+
+static u_int8_t mdisc_by_msgtype(u_int8_t msg_type)
+{
+ /* mask off the transparent bit ? */
+ msg_type &= 0xfe;
+
+ if ((msg_type & 0xf0) == 0x00)
+ return ABIS_RSL_MDISC_RLL;
+ if ((msg_type & 0xf0) == 0x10) {
+ if (msg_type >= 0x19 && msg_type <= 0x22)
+ return ABIS_RSL_MDISC_TRX;
+ else
+ return ABIS_RSL_MDISC_COM_CHAN;
+ }
+ if ((msg_type & 0xe0) == 0x20)
+ return ABIS_RSL_MDISC_DED_CHAN;
+
+ return ABIS_RSL_MDISC_LOC;
+}
+
+static inline void init_dchan_hdr(struct abis_rsl_dchan_hdr *dh,
+ u_int8_t msg_type)
+{
+ dh->c.msg_discr = mdisc_by_msgtype(msg_type);
+ dh->c.msg_type = msg_type;
+ dh->ie_chan = RSL_IE_CHAN_NR;
+}
+
+/* determine logical channel based on TRX and channel number IE */
+struct gsm_lchan *lchan_lookup(struct gsm_bts_trx *trx, u_int8_t chan_nr)
+{
+ struct gsm_lchan *lchan;
+ u_int8_t ts_nr = chan_nr & 0x07;
+ u_int8_t cbits = chan_nr >> 3;
+ u_int8_t lch_idx;
+ struct gsm_bts_trx_ts *ts = &trx->ts[ts_nr];
+
+ if (cbits == 0x01) {
+ lch_idx = 0; /* TCH/F */
+ if (ts->pchan != GSM_PCHAN_TCH_F &&
+ ts->pchan != GSM_PCHAN_PDCH &&
+ ts->pchan != GSM_PCHAN_TCH_F_PDCH)
+ LOGP(DRSL, LOGL_ERROR, "chan_nr=0x%02x but pchan=%u\n",
+ chan_nr, ts->pchan);
+ } else if ((cbits & 0x1e) == 0x02) {
+ lch_idx = cbits & 0x1; /* TCH/H */
+ if (ts->pchan != GSM_PCHAN_TCH_H)
+ LOGP(DRSL, LOGL_ERROR, "chan_nr=0x%02x but pchan=%u\n",
+ chan_nr, ts->pchan);
+ } else if ((cbits & 0x1c) == 0x04) {
+ lch_idx = cbits & 0x3; /* SDCCH/4 */
+ if (ts->pchan != GSM_PCHAN_CCCH_SDCCH4)
+ LOGP(DRSL, LOGL_ERROR, "chan_nr=0x%02x but pchan=%u\n",
+ chan_nr, ts->pchan);
+ } else if ((cbits & 0x18) == 0x08) {
+ lch_idx = cbits & 0x7; /* SDCCH/8 */
+ if (ts->pchan != GSM_PCHAN_SDCCH8_SACCH8C)
+ LOGP(DRSL, LOGL_ERROR, "chan_nr=0x%02x but pchan=%u\n",
+ chan_nr, ts->pchan);
+ } else if (cbits == 0x10 || cbits == 0x11 || cbits == 0x12) {
+ lch_idx = 0;
+ if (ts->pchan != GSM_PCHAN_CCCH &&
+ ts->pchan != GSM_PCHAN_CCCH_SDCCH4)
+ LOGP(DRSL, LOGL_ERROR, "chan_nr=0x%02x but pchan=%u\n",
+ chan_nr, ts->pchan);
+ /* FIXME: we should not return first sdcch4 !!! */
+ } else {
+ LOGP(DRSL, LOGL_ERROR, "unknown chan_nr=0x%02x\n", chan_nr);
+ return NULL;
+ }
+
+ lchan = &ts->lchan[lch_idx];
+ log_set_context(BSC_CTX_LCHAN, lchan);
+ if (lchan->conn)
+ log_set_context(BSC_CTX_SUBSCR, lchan->conn->subscr);
+
+ return lchan;
+}
+
+/* See Table 10.5.25 of GSM04.08 */
+static u_int8_t ts2chan_nr(const struct gsm_bts_trx_ts *ts, uint8_t lchan_nr)
+{
+ u_int8_t cbits, chan_nr;
+
+ switch (ts->pchan) {
+ case GSM_PCHAN_TCH_F:
+ case GSM_PCHAN_PDCH:
+ case GSM_PCHAN_TCH_F_PDCH:
+ cbits = 0x01;
+ break;
+ case GSM_PCHAN_TCH_H:
+ cbits = 0x02;
+ cbits += lchan_nr;
+ break;
+ case GSM_PCHAN_CCCH_SDCCH4:
+ cbits = 0x04;
+ cbits += lchan_nr;
+ break;
+ case GSM_PCHAN_SDCCH8_SACCH8C:
+ cbits = 0x08;
+ cbits += lchan_nr;
+ break;
+ default:
+ case GSM_PCHAN_CCCH:
+ cbits = 0x10;
+ break;
+ }
+
+ chan_nr = (cbits << 3) | (ts->nr & 0x7);
+
+ return chan_nr;
+}
+
+u_int8_t lchan2chan_nr(const struct gsm_lchan *lchan)
+{
+ return ts2chan_nr(lchan->ts, lchan->nr);
+}
+
+/* As per TS 03.03 Section 2.2, the IMSI has 'not more than 15 digits' */
+u_int64_t str_to_imsi(const char *imsi_str)
+{
+ u_int64_t ret;
+
+ ret = strtoull(imsi_str, NULL, 10);
+
+ return ret;
+}
+
+/* Table 5 Clause 7 TS 05.02 */
+unsigned int n_pag_blocks(int bs_ccch_sdcch_comb, unsigned int bs_ag_blks_res)
+{
+ if (!bs_ccch_sdcch_comb)
+ return 9 - bs_ag_blks_res;
+ else
+ return 3 - bs_ag_blks_res;
+}
+
+/* Chapter 6.5.2 of TS 05.02 */
+unsigned int get_ccch_group(u_int64_t imsi, unsigned int bs_cc_chans,
+ unsigned int n_pag_blocks)
+{
+ return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) / n_pag_blocks;
+}
+
+/* Chapter 6.5.2 of TS 05.02 */
+unsigned int get_paging_group(u_int64_t imsi, unsigned int bs_cc_chans,
+ int n_pag_blocks)
+{
+ return (imsi % 1000) % (bs_cc_chans * n_pag_blocks) % n_pag_blocks;
+}
+
+static struct msgb *rsl_msgb_alloc(void)
+{
+ return msgb_alloc_headroom(RSL_ALLOC_SIZE, RSL_ALLOC_HEADROOM,
+ "RSL");
+}
+
+#define MACBLOCK_SIZE 23
+static void pad_macblock(u_int8_t *out, const u_int8_t *in, int len)
+{
+ memcpy(out, in, len);
+
+ if (len < MACBLOCK_SIZE)
+ memset(out+len, 0x2b, MACBLOCK_SIZE-len);
+}
+
+/* Chapter 9.3.7: Encryption Information */
+static int build_encr_info(u_int8_t *out, struct gsm_lchan *lchan)
+{
+ *out++ = lchan->encr.alg_id & 0xff;
+ if (lchan->encr.key_len)
+ memcpy(out, lchan->encr.key, lchan->encr.key_len);
+ return lchan->encr.key_len + 1;
+}
+
+static void print_rsl_cause(int lvl, const u_int8_t *cause_v, u_int8_t cause_len)
+{
+ int i;
+
+ LOGPC(DRSL, lvl, "CAUSE=0x%02x(%s) ",
+ cause_v[0], rsl_err_name(cause_v[0]));
+ for (i = 1; i < cause_len-1; i++)
+ LOGPC(DRSL, lvl, "%02x ", cause_v[i]);
+}
+
+/* Send a BCCH_INFO message as per Chapter 8.5.1 */
+int rsl_bcch_info(struct gsm_bts_trx *trx, u_int8_t type,
+ const u_int8_t *data, int len)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg = rsl_msgb_alloc();
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof*dh);
+ init_dchan_hdr(dh, RSL_MT_BCCH_INFO);
+ dh->chan_nr = RSL_CHAN_BCCH;
+
+ msgb_tv_put(msg, RSL_IE_SYSINFO_TYPE, type);
+ msgb_tlv_put(msg, RSL_IE_FULL_BCCH_INFO, len, data);
+
+ msg->trx = trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+int rsl_sacch_filling(struct gsm_bts_trx *trx, u_int8_t type,
+ const u_int8_t *data, int len)
+{
+ struct abis_rsl_common_hdr *ch;
+ struct msgb *msg = rsl_msgb_alloc();
+
+ ch = (struct abis_rsl_common_hdr *) msgb_put(msg, sizeof(*ch));
+ ch->msg_discr = ABIS_RSL_MDISC_TRX;
+ ch->msg_type = RSL_MT_SACCH_FILL;
+
+ msgb_tv_put(msg, RSL_IE_SYSINFO_TYPE, type);
+ msgb_tl16v_put(msg, RSL_IE_L3_INFO, len, data);
+
+ msg->trx = trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+int rsl_sacch_info_modify(struct gsm_lchan *lchan, u_int8_t type,
+ const u_int8_t *data, int len)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg = rsl_msgb_alloc();
+ u_int8_t chan_nr = lchan2chan_nr(lchan);
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_SACCH_INFO_MODIFY);
+ dh->chan_nr = chan_nr;
+
+ msgb_tv_put(msg, RSL_IE_SYSINFO_TYPE, type);
+ msgb_tl16v_put(msg, RSL_IE_L3_INFO, len, data);
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+int rsl_chan_bs_power_ctrl(struct gsm_lchan *lchan, unsigned int fpc, int db)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg;
+ u_int8_t chan_nr = lchan2chan_nr(lchan);
+
+ db = abs(db);
+ if (db > 30)
+ return -EINVAL;
+
+ msg = rsl_msgb_alloc();
+
+ lchan->bs_power = db/2;
+ if (fpc)
+ lchan->bs_power |= 0x10;
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_BS_POWER_CONTROL);
+ dh->chan_nr = chan_nr;
+
+ msgb_tv_put(msg, RSL_IE_BS_POWER, lchan->bs_power);
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+int rsl_chan_ms_power_ctrl(struct gsm_lchan *lchan, unsigned int fpc, int dbm)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg;
+ u_int8_t chan_nr = lchan2chan_nr(lchan);
+ int ctl_lvl;
+
+ ctl_lvl = ms_pwr_ctl_lvl(lchan->ts->trx->bts->band, dbm);
+ if (ctl_lvl < 0)
+ return ctl_lvl;
+
+ msg = rsl_msgb_alloc();
+
+ lchan->ms_power = ctl_lvl;
+
+ if (fpc)
+ lchan->ms_power |= 0x20;
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_MS_POWER_CONTROL);
+ dh->chan_nr = chan_nr;
+
+ msgb_tv_put(msg, RSL_IE_MS_POWER, lchan->ms_power);
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+static int channel_mode_from_lchan(struct rsl_ie_chan_mode *cm,
+ struct gsm_lchan *lchan)
+{
+ memset(cm, 0, sizeof(cm));
+
+ /* FIXME: what to do with data calls ? */
+ if (lchan->ts->trx->bts->network->dtx_enabled)
+ cm->dtx_dtu = 0x03;
+ else
+ cm->dtx_dtu = 0x00;
+
+ /* set TCH Speech/Data */
+ cm->spd_ind = lchan->rsl_cmode;
+
+ if (lchan->rsl_cmode == RSL_CMOD_SPD_SIGN &&
+ lchan->tch_mode != GSM48_CMODE_SIGN)
+ LOGP(DRSL, LOGL_ERROR, "unsupported: rsl_mode == signalling, "
+ "but tch_mode != signalling\n");
+
+ switch (lchan->type) {
+ case GSM_LCHAN_SDCCH:
+ cm->chan_rt = RSL_CMOD_CRT_SDCCH;
+ break;
+ case GSM_LCHAN_TCH_F:
+ cm->chan_rt = RSL_CMOD_CRT_TCH_Bm;
+ break;
+ case GSM_LCHAN_TCH_H:
+ cm->chan_rt = RSL_CMOD_CRT_TCH_Lm;
+ break;
+ case GSM_LCHAN_NONE:
+ case GSM_LCHAN_UNKNOWN:
+ default:
+ return -EINVAL;
+ }
+
+ switch (lchan->tch_mode) {
+ case GSM48_CMODE_SIGN:
+ cm->chan_rate = 0;
+ break;
+ case GSM48_CMODE_SPEECH_V1:
+ cm->chan_rate = RSL_CMOD_SP_GSM1;
+ break;
+ case GSM48_CMODE_SPEECH_EFR:
+ cm->chan_rate = RSL_CMOD_SP_GSM2;
+ break;
+ case GSM48_CMODE_SPEECH_AMR:
+ cm->chan_rate = RSL_CMOD_SP_GSM3;
+ break;
+ case GSM48_CMODE_DATA_14k5:
+ cm->chan_rate = RSL_CMOD_SP_NT_14k5;
+ break;
+ case GSM48_CMODE_DATA_12k0:
+ cm->chan_rate = RSL_CMOD_SP_NT_12k0;
+ break;
+ case GSM48_CMODE_DATA_6k0:
+ cm->chan_rate = RSL_CMOD_SP_NT_6k0;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+/* Chapter 8.4.1 */
+#if 0
+int rsl_chan_activate(struct gsm_bts_trx *trx, u_int8_t chan_nr,
+ u_int8_t act_type,
+ struct rsl_ie_chan_mode *chan_mode,
+ struct rsl_ie_chan_ident *chan_ident,
+ u_int8_t bs_power, u_int8_t ms_power,
+ u_int8_t ta)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg = rsl_msgb_alloc();
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_CHAN_ACTIV);
+ dh->chan_nr = chan_nr;
+
+ msgb_tv_put(msg, RSL_IE_ACT_TYPE, act_type);
+ /* For compatibility with Phase 1 */
+ msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(*chan_mode),
+ (u_int8_t *) chan_mode);
+ msgb_tlv_put(msg, RSL_IE_CHAN_IDENT, 4,
+ (u_int8_t *) chan_ident);
+#if 0
+ msgb_tlv_put(msg, RSL_IE_ENCR_INFO, 1,
+ (u_int8_t *) &encr_info);
+#endif
+ msgb_tv_put(msg, RSL_IE_BS_POWER, bs_power);
+ msgb_tv_put(msg, RSL_IE_MS_POWER, ms_power);
+ msgb_tv_put(msg, RSL_IE_TIMING_ADVANCE, ta);
+
+ msg->trx = trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+#endif
+
+int rsl_chan_activate_lchan(struct gsm_lchan *lchan, u_int8_t act_type,
+ u_int8_t ta, u_int8_t ho_ref)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg;
+ int rc;
+ uint8_t *len;
+
+ u_int8_t chan_nr = lchan2chan_nr(lchan);
+ struct rsl_ie_chan_mode cm;
+ struct gsm48_chan_desc cd;
+
+ rc = channel_mode_from_lchan(&cm, lchan);
+ if (rc < 0)
+ return rc;
+
+ memset(&cd, 0, sizeof(cd));
+ gsm48_lchan2chan_desc(&cd, lchan);
+
+ msg = rsl_msgb_alloc();
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_CHAN_ACTIV);
+ dh->chan_nr = chan_nr;
+
+ msgb_tv_put(msg, RSL_IE_ACT_TYPE, act_type);
+ msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(cm),
+ (u_int8_t *) &cm);
+
+ /*
+ * The Channel Identification is needed for Phase1 phones
+ * and it contains the GSM48 Channel Description and the
+ * Mobile Allocation. The GSM 08.58 asks for the Mobile
+ * Allocation to have a length of zero. We are using the
+ * msgb_l3len to calculate the length of both messages.
+ */
+ msgb_v_put(msg, RSL_IE_CHAN_IDENT);
+ len = msgb_put(msg, 1);
+ msgb_tlv_put(msg, GSM48_IE_CHANDESC_2, sizeof(cd), (const uint8_t *) &cd);
+
+ if (lchan->ts->hopping.enabled)
+ msgb_tlv_put(msg, GSM48_IE_MA_AFTER, lchan->ts->hopping.ma_len,
+ lchan->ts->hopping.ma_data);
+ else
+ msgb_tlv_put(msg, GSM48_IE_MA_AFTER, 0, NULL);
+
+ /* update the calculated size */
+ msg->l3h = len + 1;
+ *len = msgb_l3len(msg);
+
+ if (lchan->encr.alg_id > RSL_ENC_ALG_A5(0)) {
+ u_int8_t encr_info[MAX_A5_KEY_LEN+2];
+ rc = build_encr_info(encr_info, lchan);
+ if (rc > 0)
+ msgb_tlv_put(msg, RSL_IE_ENCR_INFO, rc, encr_info);
+ }
+
+ switch (act_type) {
+ case RSL_ACT_INTER_ASYNC:
+ case RSL_ACT_INTER_SYNC:
+ msgb_tv_put(msg, RSL_IE_HANDO_REF, ho_ref);
+ break;
+ default:
+ break;
+ }
+
+ msgb_tv_put(msg, RSL_IE_BS_POWER, lchan->bs_power);
+ msgb_tv_put(msg, RSL_IE_MS_POWER, lchan->ms_power);
+ msgb_tv_put(msg, RSL_IE_TIMING_ADVANCE, ta);
+
+ if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR)
+ msgb_tlv_put(msg, RSL_IE_MR_CONFIG, sizeof(lchan->mr_conf),
+ (u_int8_t *) &lchan->mr_conf);
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+/* Chapter 8.4.9: Modify channel mode on BTS side */
+int rsl_chan_mode_modify_req(struct gsm_lchan *lchan)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg;
+ int rc;
+
+ u_int8_t chan_nr = lchan2chan_nr(lchan);
+ struct rsl_ie_chan_mode cm;
+
+ rc = channel_mode_from_lchan(&cm, lchan);
+ if (rc < 0)
+ return rc;
+
+ msg = rsl_msgb_alloc();
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_MODE_MODIFY_REQ);
+ dh->chan_nr = chan_nr;
+
+ msgb_tlv_put(msg, RSL_IE_CHAN_MODE, sizeof(cm),
+ (u_int8_t *) &cm);
+
+ if (lchan->encr.alg_id > RSL_ENC_ALG_A5(0)) {
+ u_int8_t encr_info[MAX_A5_KEY_LEN+2];
+ rc = build_encr_info(encr_info, lchan);
+ if (rc > 0)
+ msgb_tlv_put(msg, RSL_IE_ENCR_INFO, rc, encr_info);
+ }
+
+ if (lchan->tch_mode == GSM48_CMODE_SPEECH_AMR) {
+ msgb_tlv_put(msg, RSL_IE_MR_CONFIG, sizeof(lchan->mr_conf),
+ (u_int8_t *) &lchan->mr_conf);
+ }
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+/* Chapter 8.4.6: Send the encryption command with given L3 info */
+int rsl_encryption_cmd(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct gsm_lchan *lchan = msg->lchan;
+ u_int8_t chan_nr = lchan2chan_nr(lchan);
+ u_int8_t encr_info[MAX_A5_KEY_LEN+2];
+ u_int8_t l3_len = msg->len;
+ int rc;
+
+ /* First push the L3 IE tag and length */
+ msgb_tv16_push(msg, RSL_IE_L3_INFO, l3_len);
+
+ /* then the link identifier (SAPI0, main sign link) */
+ msgb_tv_push(msg, RSL_IE_LINK_IDENT, 0);
+
+ /* then encryption information */
+ rc = build_encr_info(encr_info, lchan);
+ if (rc <= 0)
+ return rc;
+ msgb_tlv_push(msg, RSL_IE_ENCR_INFO, rc, encr_info);
+
+ /* and finally the DCHAN header */
+ dh = (struct abis_rsl_dchan_hdr *) msgb_push(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_ENCR_CMD);
+ dh->chan_nr = chan_nr;
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+/* Chapter 8.4.5 / 4.6: Deactivate the SACCH after 04.08 RR CHAN RELEASE */
+int rsl_deact_sacch(struct gsm_lchan *lchan)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg = rsl_msgb_alloc();
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_DEACTIVATE_SACCH);
+ dh->chan_nr = lchan2chan_nr(lchan);
+
+ msg->lchan = lchan;
+ msg->trx = lchan->ts->trx;
+
+ DEBUGP(DRSL, "%s DEACTivate SACCH CMD\n", gsm_lchan_name(lchan));
+
+ return abis_rsl_sendmsg(msg);
+}
+
+static void error_timeout_cb(void *data)
+{
+ struct gsm_lchan *lchan = data;
+ if (lchan->state != LCHAN_S_REL_ERR) {
+ LOGP(DRSL, LOGL_ERROR, "%s error timeout but not in error state: %d\n",
+ gsm_lchan_name(lchan), lchan->state);
+ return;
+ }
+
+ /* go back to the none state */
+ LOGP(DRSL, LOGL_NOTICE, "%s is back in operation.\n", gsm_lchan_name(lchan));
+ rsl_lchan_set_state(lchan, LCHAN_S_NONE);
+}
+
+static int rsl_rx_rf_chan_rel_ack(struct gsm_lchan *lchan);
+
+/* Chapter 8.4.14 / 4.7: Tell BTS to release the radio channel */
+static int rsl_rf_chan_release(struct gsm_lchan *lchan, int error)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg;
+ int rc;
+
+ if (lchan->state == LCHAN_S_REL_ERR) {
+ LOGP(DRSL, LOGL_NOTICE, "%s is in error state not sending release.\n",
+ gsm_lchan_name(lchan));
+ return -1;
+ }
+
+ msg = rsl_msgb_alloc();
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_RF_CHAN_REL);
+ dh->chan_nr = lchan2chan_nr(lchan);
+
+ msg->lchan = lchan;
+ msg->trx = lchan->ts->trx;
+
+ DEBUGP(DRSL, "%s RF Channel Release CMD due error %d\n", gsm_lchan_name(lchan), error);
+
+ if (error) {
+ /*
+ * the nanoBTS sends RLL release indications after the channel release. This can
+ * be a problem when we have reassigned the channel to someone else and then can
+ * not figure out who used this channel.
+ */
+ rsl_lchan_set_state(lchan, LCHAN_S_REL_ERR);
+ lchan->error_timer.data = lchan;
+ lchan->error_timer.cb = error_timeout_cb;
+ bsc_schedule_timer(&lchan->error_timer,
+ msg->trx->bts->network->T3111 + 2, 0);
+ }
+
+ rc = abis_rsl_sendmsg(msg);
+
+ /* BTS will respond by RF CHAN REL ACK */
+#ifdef HSL_SR_1_0
+ /* The HSL Femto seems to 'forget' sending a REL ACK for TS1...TS7 */
+ if (lchan->ts->trx->bts->type == GSM_BTS_TYPE_HSL_FEMTO && lchan->ts->nr != 0)
+ rc = rsl_rx_rf_chan_rel_ack(lchan);
+#endif
+
+ return rc;
+}
+
+static int rsl_rx_rf_chan_rel_ack(struct gsm_lchan *lchan)
+{
+
+ DEBUGP(DRSL, "%s RF CHANNEL RELEASE ACK\n", gsm_lchan_name(lchan));
+
+ if (lchan->state != LCHAN_S_REL_REQ && lchan->state != LCHAN_S_REL_ERR)
+ LOGP(DRSL, LOGL_NOTICE, "%s CHAN REL ACK but state %s\n",
+ gsm_lchan_name(lchan),
+ gsm_lchans_name(lchan->state));
+ bsc_del_timer(&lchan->T3111);
+ /* we have an error timer pending to release that */
+ if (lchan->state != LCHAN_S_REL_ERR)
+ rsl_lchan_set_state(lchan, LCHAN_S_NONE);
+ lchan_free(lchan);
+
+ return 0;
+}
+
+int rsl_paging_cmd(struct gsm_bts *bts, u_int8_t paging_group, u_int8_t len,
+ u_int8_t *ms_ident, u_int8_t chan_needed)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *msg = rsl_msgb_alloc();
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_PAGING_CMD);
+ dh->chan_nr = RSL_CHAN_PCH_AGCH;
+
+ msgb_tv_put(msg, RSL_IE_PAGING_GROUP, paging_group);
+ msgb_tlv_put(msg, RSL_IE_MS_IDENTITY, len-2, ms_ident+2);
+ msgb_tv_put(msg, RSL_IE_CHAN_NEEDED, chan_needed);
+
+ msg->trx = bts->c0;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+int imsi_str2bcd(u_int8_t *bcd_out, const char *str_in)
+{
+ int i, len = strlen(str_in);
+
+ for (i = 0; i < len; i++) {
+ int num = str_in[i] - 0x30;
+ if (num < 0 || num > 9)
+ return -1;
+ if (i % 2 == 0)
+ bcd_out[i/2] = num;
+ else
+ bcd_out[i/2] |= (num << 4);
+ }
+
+ return 0;
+}
+
+/* Chapter 8.5.6 */
+int rsl_imm_assign_cmd(struct gsm_bts *bts, u_int8_t len, u_int8_t *val)
+{
+ struct msgb *msg = rsl_msgb_alloc();
+ struct abis_rsl_dchan_hdr *dh;
+ u_int8_t buf[MACBLOCK_SIZE];
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_IMMEDIATE_ASSIGN_CMD);
+ dh->chan_nr = RSL_CHAN_PCH_AGCH;
+
+ switch (bts->type) {
+ case GSM_BTS_TYPE_BS11:
+ msgb_tlv_put(msg, RSL_IE_IMM_ASS_INFO, len, val);
+ break;
+ default:
+ /* If phase 2, construct a FULL_IMM_ASS_INFO */
+ pad_macblock(buf, val, len);
+ msgb_tlv_put(msg, RSL_IE_FULL_IMM_ASS_INFO, MACBLOCK_SIZE, buf);
+ break;
+ }
+
+ msg->trx = bts->c0;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+/* Send Siemens specific MS RF Power Capability Indication */
+int rsl_siemens_mrpci(struct gsm_lchan *lchan, struct rsl_mrpci *mrpci)
+{
+ struct msgb *msg = rsl_msgb_alloc();
+ struct abis_rsl_dchan_hdr *dh;
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_SIEMENS_MRPCI);
+ dh->c.msg_discr = ABIS_RSL_MDISC_DED_CHAN;
+ dh->chan_nr = lchan2chan_nr(lchan);
+ msgb_tv_put(msg, RSL_IE_SIEMENS_MRPCI, *(u_int8_t *)mrpci);
+
+ DEBUGP(DRSL, "%s TX Siemens MRPCI 0x%02x\n",
+ gsm_lchan_name(lchan), *(u_int8_t *)mrpci);
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+
+/* Send "DATA REQUEST" message with given L3 Info payload */
+/* Chapter 8.3.1 */
+int rsl_data_request(struct msgb *msg, u_int8_t link_id)
+{
+ if (msg->lchan == NULL) {
+ LOGP(DRSL, LOGL_ERROR, "cannot send DATA REQUEST to unknown lchan\n");
+ return -EINVAL;
+ }
+
+ rsl_rll_push_l3(msg, RSL_MT_DATA_REQ, lchan2chan_nr(msg->lchan),
+ link_id, 1);
+
+ msg->trx = msg->lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+/* Send "ESTABLISH REQUEST" message with given L3 Info payload */
+/* Chapter 8.3.1 */
+int rsl_establish_request(struct gsm_lchan *lchan, u_int8_t link_id)
+{
+ struct msgb *msg;
+
+ msg = rsl_rll_simple(RSL_MT_EST_REQ, lchan2chan_nr(lchan),
+ link_id, 0);
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+/* Chapter 8.3.7 Request the release of multiframe mode of RLL connection.
+ This is what higher layers should call. The BTS then responds with
+ RELEASE CONFIRM, which we in turn use to trigger RSL CHANNEL RELEASE,
+ which in turn is acknowledged by RSL CHANNEL RELEASE ACK, which calls
+ lchan_free() */
+int rsl_release_request(struct gsm_lchan *lchan, u_int8_t link_id, u_int8_t reason)
+{
+
+ struct msgb *msg;
+
+ msg = rsl_rll_simple(RSL_MT_REL_REQ, lchan2chan_nr(lchan),
+ link_id, 0);
+ /* 0 is normal release, 1 is local end */
+ msgb_tv_put(msg, RSL_IE_RELEASE_MODE, reason);
+
+ /* FIXME: start some timer in case we don't receive a REL ACK ? */
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+int rsl_lchan_set_state(struct gsm_lchan *lchan, int state)
+{
+ lchan->state = state;
+ return 0;
+}
+
+/* Chapter 8.4.2: Channel Activate Acknowledge */
+static int rsl_rx_chan_act_ack(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg);
+
+ /* BTS has confirmed channel activation, we now need
+ * to assign the activated channel to the MS */
+ if (rslh->ie_chan != RSL_IE_CHAN_NR)
+ return -EINVAL;
+
+ if (msg->lchan->state != LCHAN_S_ACT_REQ)
+ LOGP(DRSL, LOGL_NOTICE, "%s CHAN ACT ACK, but state %s\n",
+ gsm_lchan_name(msg->lchan),
+ gsm_lchans_name(msg->lchan->state));
+ rsl_lchan_set_state(msg->lchan, LCHAN_S_ACTIVE);
+
+ if (msg->lchan->rqd_ref) {
+ rsl_send_imm_assignment(msg->lchan);
+ talloc_free(msg->lchan->rqd_ref);
+ msg->lchan->rqd_ref = NULL;
+ msg->lchan->rqd_ta = 0;
+ }
+
+ send_lchan_signal(S_LCHAN_ACTIVATE_ACK, msg->lchan, NULL);
+
+ return 0;
+}
+
+/* Chapter 8.4.3: Channel Activate NACK */
+static int rsl_rx_chan_act_nack(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
+ struct tlv_parsed tp;
+
+ LOGP(DRSL, LOGL_ERROR, "%s CHANNEL ACTIVATE NACK",
+ gsm_lchan_name(msg->lchan));
+
+ /* BTS has rejected channel activation ?!? */
+ if (dh->ie_chan != RSL_IE_CHAN_NR)
+ return -EINVAL;
+
+ rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh));
+ if (TLVP_PRESENT(&tp, RSL_IE_CAUSE)) {
+ const u_int8_t *cause = TLVP_VAL(&tp, RSL_IE_CAUSE);
+ print_rsl_cause(LOGL_ERROR, cause,
+ TLVP_LEN(&tp, RSL_IE_CAUSE));
+ if (*cause != RSL_ERR_RCH_ALR_ACTV_ALLOC)
+ rsl_lchan_set_state(msg->lchan, LCHAN_S_NONE);
+ } else
+ rsl_lchan_set_state(msg->lchan, LCHAN_S_NONE);
+
+ LOGPC(DRSL, LOGL_ERROR, "\n");
+
+ send_lchan_signal(S_LCHAN_ACTIVATE_NACK, msg->lchan, NULL);
+
+ lchan_free(msg->lchan);
+ return 0;
+}
+
+/* Chapter 8.4.4: Connection Failure Indication */
+static int rsl_rx_conn_fail(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
+ struct tlv_parsed tp;
+
+ /* FIXME: print which channel */
+ LOGP(DRSL, LOGL_NOTICE, "%s CONNECTION FAIL: RELEASING ",
+ gsm_lchan_name(msg->lchan));
+
+ rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh));
+
+ if (TLVP_PRESENT(&tp, RSL_IE_CAUSE))
+ print_rsl_cause(LOGL_NOTICE, TLVP_VAL(&tp, RSL_IE_CAUSE),
+ TLVP_LEN(&tp, RSL_IE_CAUSE));
+
+ LOGPC(DRSL, LOGL_NOTICE, "\n");
+ /* FIXME: only free it after channel release ACK */
+ counter_inc(msg->lchan->ts->trx->bts->network->stats.chan.rf_fail);
+ return rsl_rf_chan_release(msg->lchan, 1);
+}
+
+static void print_meas_rep_uni(struct gsm_meas_rep_unidir *mru,
+ const char *prefix)
+{
+ DEBUGPC(DMEAS, "RXL-FULL-%s=%3ddBm RXL-SUB-%s=%3ddBm ",
+ prefix, rxlev2dbm(mru->full.rx_lev),
+ prefix, rxlev2dbm(mru->sub.rx_lev));
+ DEBUGPC(DMEAS, "RXQ-FULL-%s=%d RXQ-SUB-%s=%d ",
+ prefix, mru->full.rx_qual, prefix, mru->sub.rx_qual);
+}
+
+static void print_meas_rep(struct gsm_meas_rep *mr)
+{
+ int i;
+
+ DEBUGP(DMEAS, "MEASUREMENT RESULT NR=%d ", mr->nr);
+
+ if (mr->flags & MEAS_REP_F_DL_DTX)
+ DEBUGPC(DMEAS, "DTXd ");
+
+ print_meas_rep_uni(&mr->ul, "ul");
+ DEBUGPC(DMEAS, "BS_POWER=%d ", mr->bs_power);
+ if (mr->flags & MEAS_REP_F_MS_TO)
+ DEBUGPC(DMEAS, "MS_TO=%d ", mr->ms_timing_offset);
+
+ if (mr->flags & MEAS_REP_F_MS_L1) {
+ DEBUGPC(DMEAS, "L1_MS_PWR=%3ddBm ", mr->ms_l1.pwr);
+ DEBUGPC(DMEAS, "L1_FPC=%u ",
+ mr->flags & MEAS_REP_F_FPC ? 1 : 0);
+ DEBUGPC(DMEAS, "L1_TA=%u ", mr->ms_l1.ta);
+ }
+
+ if (mr->flags & MEAS_REP_F_UL_DTX)
+ DEBUGPC(DMEAS, "DTXu ");
+ if (mr->flags & MEAS_REP_F_BA1)
+ DEBUGPC(DMEAS, "BA1 ");
+ if (!(mr->flags & MEAS_REP_F_DL_VALID))
+ DEBUGPC(DMEAS, "NOT VALID ");
+ else
+ print_meas_rep_uni(&mr->dl, "dl");
+
+ DEBUGPC(DMEAS, "NUM_NEIGH=%u\n", mr->num_cell);
+ if (mr->num_cell == 7)
+ return;
+ for (i = 0; i < mr->num_cell; i++) {
+ struct gsm_meas_rep_cell *mrc = &mr->cell[i];
+ DEBUGP(DMEAS, "IDX=%u ARFCN=%u BSIC=%u => %d dBm\n",
+ mrc->neigh_idx, mrc->arfcn, mrc->bsic, rxlev2dbm(mrc->rxlev));
+ }
+}
+
+static int rsl_rx_meas_res(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
+ struct tlv_parsed tp;
+ struct gsm_meas_rep *mr = lchan_next_meas_rep(msg->lchan);
+ u_int8_t len;
+ const u_int8_t *val;
+ int rc;
+
+ /* check if this channel is actually active */
+ /* FIXME: maybe this check should be way more generic/centralized */
+ if (msg->lchan->state != LCHAN_S_ACTIVE) {
+ LOGP(DRSL, LOGL_DEBUG, "%s: MEAS RES for inactive channel\n",
+ gsm_lchan_name(msg->lchan));
+ return 0;
+ }
+
+ memset(mr, 0, sizeof(*mr));
+ mr->lchan = msg->lchan;
+
+ rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh));
+
+ if (!TLVP_PRESENT(&tp, RSL_IE_MEAS_RES_NR) ||
+ !TLVP_PRESENT(&tp, RSL_IE_UPLINK_MEAS) ||
+ !TLVP_PRESENT(&tp, RSL_IE_BS_POWER))
+ return -EIO;
+
+ /* Mandatory Parts */
+ mr->nr = *TLVP_VAL(&tp, RSL_IE_MEAS_RES_NR);
+
+ len = TLVP_LEN(&tp, RSL_IE_UPLINK_MEAS);
+ val = TLVP_VAL(&tp, RSL_IE_UPLINK_MEAS);
+ if (len >= 3) {
+ if (val[0] & 0x40)
+ mr->flags |= MEAS_REP_F_DL_DTX;
+ mr->ul.full.rx_lev = val[0] & 0x3f;
+ mr->ul.sub.rx_lev = val[1] & 0x3f;
+ mr->ul.full.rx_qual = val[2]>>3 & 0x7;
+ mr->ul.sub.rx_qual = val[2] & 0x7;
+ }
+
+ mr->bs_power = *TLVP_VAL(&tp, RSL_IE_BS_POWER);
+
+ /* Optional Parts */
+ if (TLVP_PRESENT(&tp, RSL_IE_MS_TIMING_OFFSET))
+ mr->ms_timing_offset =
+ *TLVP_VAL(&tp, RSL_IE_MS_TIMING_OFFSET);
+
+ if (TLVP_PRESENT(&tp, RSL_IE_L1_INFO)) {
+ val = TLVP_VAL(&tp, RSL_IE_L1_INFO);
+ mr->flags |= MEAS_REP_F_MS_L1;
+ mr->ms_l1.pwr = ms_pwr_dbm(msg->trx->bts->band, val[0] >> 3);
+ if (val[0] & 0x04)
+ mr->flags |= MEAS_REP_F_FPC;
+ mr->ms_l1.ta = val[1];
+ }
+ if (TLVP_PRESENT(&tp, RSL_IE_L3_INFO)) {
+ msg->l3h = (u_int8_t *) TLVP_VAL(&tp, RSL_IE_L3_INFO);
+ rc = gsm48_parse_meas_rep(mr, msg);
+ if (rc < 0)
+ return rc;
+ }
+
+ print_meas_rep(mr);
+
+ send_lchan_signal(S_LCHAN_MEAS_REP, msg->lchan, mr);
+
+ return 0;
+}
+
+/* Chapter 8.4.7 */
+static int rsl_rx_hando_det(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
+ struct tlv_parsed tp;
+
+ DEBUGP(DRSL, "%s HANDOVER DETECT ", gsm_lchan_name(msg->lchan));
+
+ rsl_tlv_parse(&tp, dh->data, msgb_l2len(msg)-sizeof(*dh));
+
+ if (TLVP_PRESENT(&tp, RSL_IE_ACCESS_DELAY))
+ DEBUGPC(DRSL, "access delay = %u\n",
+ *TLVP_VAL(&tp, RSL_IE_ACCESS_DELAY));
+ else
+ DEBUGPC(DRSL, "\n");
+
+ send_lchan_signal(S_LCHAN_HANDOVER_DETECT, msg->lchan, NULL);
+
+ return 0;
+}
+
+static int abis_rsl_rx_dchan(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg);
+ int rc = 0;
+ char *ts_name;
+
+ msg->lchan = lchan_lookup(msg->trx, rslh->chan_nr);
+ ts_name = gsm_lchan_name(msg->lchan);
+
+ switch (rslh->c.msg_type) {
+ case RSL_MT_CHAN_ACTIV_ACK:
+ DEBUGP(DRSL, "%s CHANNEL ACTIVATE ACK\n", ts_name);
+ rc = rsl_rx_chan_act_ack(msg);
+ break;
+ case RSL_MT_CHAN_ACTIV_NACK:
+ rc = rsl_rx_chan_act_nack(msg);
+ break;
+ case RSL_MT_CONN_FAIL:
+ rc = rsl_rx_conn_fail(msg);
+ break;
+ case RSL_MT_MEAS_RES:
+ rc = rsl_rx_meas_res(msg);
+ break;
+ case RSL_MT_HANDO_DET:
+ rc = rsl_rx_hando_det(msg);
+ break;
+ case RSL_MT_RF_CHAN_REL_ACK:
+ rc = rsl_rx_rf_chan_rel_ack(msg->lchan);
+ break;
+ case RSL_MT_MODE_MODIFY_ACK:
+ DEBUGP(DRSL, "%s CHANNEL MODE MODIFY ACK\n", ts_name);
+ break;
+ case RSL_MT_MODE_MODIFY_NACK:
+ LOGP(DRSL, LOGL_ERROR, "%s CHANNEL MODE MODIFY NACK\n", ts_name);
+ break;
+ case RSL_MT_IPAC_PDCH_ACT_ACK:
+ DEBUGPC(DRSL, "%s IPAC PDCH ACT ACK\n", ts_name);
+ msg->lchan->ts->flags |= TS_F_PDCH_MODE;
+ break;
+ case RSL_MT_IPAC_PDCH_ACT_NACK:
+ LOGP(DRSL, LOGL_ERROR, "%s IPAC PDCH ACT NACK\n", ts_name);
+ break;
+ case RSL_MT_IPAC_PDCH_DEACT_ACK:
+ DEBUGP(DRSL, "%s IPAC PDCH DEACT ACK\n", ts_name);
+ msg->lchan->ts->flags &= ~TS_F_PDCH_MODE;
+ break;
+ case RSL_MT_IPAC_PDCH_DEACT_NACK:
+ LOGP(DRSL, LOGL_ERROR, "%s IPAC PDCH DEACT NACK\n", ts_name);
+ break;
+ case RSL_MT_PHY_CONTEXT_CONF:
+ case RSL_MT_PREPROC_MEAS_RES:
+ case RSL_MT_TALKER_DET:
+ case RSL_MT_LISTENER_DET:
+ case RSL_MT_REMOTE_CODEC_CONF_REP:
+ case RSL_MT_MR_CODEC_MOD_ACK:
+ case RSL_MT_MR_CODEC_MOD_NACK:
+ case RSL_MT_MR_CODEC_MOD_PER:
+ LOGP(DRSL, LOGL_NOTICE, "%s Unimplemented Abis RSL DChan "
+ "msg 0x%02x\n", ts_name, rslh->c.msg_type);
+ break;
+ default:
+ LOGP(DRSL, LOGL_NOTICE, "%s unknown Abis RSL DChan msg 0x%02x\n",
+ ts_name, rslh->c.msg_type);
+ return -EINVAL;
+ }
+
+ return rc;
+}
+
+static int rsl_rx_error_rep(struct msgb *msg)
+{
+ struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
+ struct tlv_parsed tp;
+
+ LOGP(DRSL, LOGL_ERROR, "%s ERROR REPORT ", gsm_trx_name(msg->trx));
+
+ rsl_tlv_parse(&tp, rslh->data, msgb_l2len(msg)-sizeof(*rslh));
+
+ if (TLVP_PRESENT(&tp, RSL_IE_CAUSE))
+ print_rsl_cause(LOGL_ERROR, TLVP_VAL(&tp, RSL_IE_CAUSE),
+ TLVP_LEN(&tp, RSL_IE_CAUSE));
+
+ LOGPC(DRSL, LOGL_ERROR, "\n");
+
+ return 0;
+}
+
+static int abis_rsl_rx_trx(struct msgb *msg)
+{
+ struct abis_rsl_common_hdr *rslh = msgb_l2(msg);
+ int rc = 0;
+
+ switch (rslh->msg_type) {
+ case RSL_MT_ERROR_REPORT:
+ rc = rsl_rx_error_rep(msg);
+ break;
+ case RSL_MT_RF_RES_IND:
+ /* interference on idle channels of TRX */
+ //DEBUGP(DRSL, "%s RF Resource Indication\n", gsm_trx_name(msg->trx));
+ break;
+ case RSL_MT_OVERLOAD:
+ /* indicate CCCH / ACCH / processor overload */
+ LOGP(DRSL, LOGL_ERROR, "%s CCCH/ACCH/CPU Overload\n",
+ gsm_trx_name(msg->trx));
+ break;
+ default:
+ LOGP(DRSL, LOGL_NOTICE, "%s Unknown Abis RSL TRX message "
+ "type 0x%02x\n", gsm_trx_name(msg->trx), rslh->msg_type);
+ return -EINVAL;
+ }
+ return rc;
+}
+
+/* If T3101 expires, we never received a response to IMMEDIATE ASSIGN */
+static void t3101_expired(void *data)
+{
+ struct gsm_lchan *lchan = data;
+
+ rsl_rf_chan_release(lchan, 1);
+}
+
+/* If T3111 expires, we will send the RF Channel Request */
+static void t3111_expired(void *data)
+{
+ struct gsm_lchan *lchan = data;
+
+ rsl_rf_chan_release(lchan, 0);
+}
+
+#define GSM48_LEN2PLEN(a) (((a) << 2) | 1)
+
+/* Format an IMM ASS REJ according to 04.08 Chapter 9.1.20 */
+static int rsl_send_imm_ass_rej(struct gsm_bts *bts,
+ unsigned int num_req_refs,
+ struct gsm48_req_ref *rqd_refs,
+ uint8_t wait_ind)
+{
+ uint8_t buf[GSM_MACBLOCK_LEN];
+ struct gsm48_imm_ass_rej *iar = (struct gsm48_imm_ass_rej *)buf;
+
+ /* create IMMEDIATE ASSIGN REJECT 04.08 message */
+ memset(iar, 0, sizeof(*iar));
+ iar->proto_discr = GSM48_PDISC_RR;
+ iar->msg_type = GSM48_MT_RR_IMM_ASS;
+ iar->page_mode = GSM48_PM_SAME;
+
+ memcpy(&iar->req_ref1, &rqd_refs[0], sizeof(iar->req_ref1));
+ iar->wait_ind1 = wait_ind;
+
+ if (num_req_refs >= 2)
+ memcpy(&iar->req_ref2, &rqd_refs[1], sizeof(iar->req_ref2));
+ else
+ memcpy(&iar->req_ref2, &rqd_refs[0], sizeof(iar->req_ref2));
+ iar->wait_ind2 = wait_ind;
+
+ if (num_req_refs >= 3)
+ memcpy(&iar->req_ref3, &rqd_refs[2], sizeof(iar->req_ref3));
+ else
+ memcpy(&iar->req_ref3, &rqd_refs[0], sizeof(iar->req_ref3));
+ iar->wait_ind3 = wait_ind;
+
+ if (num_req_refs >= 4)
+ memcpy(&iar->req_ref4, &rqd_refs[3], sizeof(iar->req_ref4));
+ else
+ memcpy(&iar->req_ref4, &rqd_refs[0], sizeof(iar->req_ref4));
+ iar->wait_ind4 = wait_ind;
+
+ return rsl_imm_assign_cmd(bts, sizeof(iar), (uint8_t *) iar);
+}
+
+/* MS has requested a channel on the RACH */
+static int rsl_rx_chan_rqd(struct msgb *msg)
+{
+ struct gsm_bts *bts = msg->trx->bts;
+ struct abis_rsl_dchan_hdr *rqd_hdr = msgb_l2(msg);
+ struct gsm48_req_ref *rqd_ref;
+ enum gsm_chan_t lctype;
+ enum gsm_chreq_reason_t chreq_reason;
+ struct gsm_lchan *lchan;
+ u_int8_t rqd_ta;
+ int is_lu;
+
+ u_int16_t arfcn;
+ u_int8_t ts_number, subch;
+
+ /* parse request reference to be used in immediate assign */
+ if (rqd_hdr->data[0] != RSL_IE_REQ_REFERENCE)
+ return -EINVAL;
+
+ rqd_ref = (struct gsm48_req_ref *) &rqd_hdr->data[1];
+
+ /* parse access delay and use as TA */
+ if (rqd_hdr->data[sizeof(struct gsm48_req_ref)+1] != RSL_IE_ACCESS_DELAY)
+ return -EINVAL;
+ rqd_ta = rqd_hdr->data[sizeof(struct gsm48_req_ref)+2];
+
+ /* determine channel type (SDCCH/TCH_F/TCH_H) based on
+ * request reference RA */
+ lctype = get_ctype_by_chreq(bts->network, rqd_ref->ra);
+ chreq_reason = get_reason_by_chreq(rqd_ref->ra, bts->network->neci);
+
+ counter_inc(bts->network->stats.chreq.total);
+
+ /*
+ * We want LOCATION UPDATES to succeed and will assign a TCH
+ * if we have no SDCCH available.
+ */
+ is_lu = !!(chreq_reason == GSM_CHREQ_REASON_LOCATION_UPD);
+
+ /* check availability / allocate channel */
+ lchan = lchan_alloc(bts, lctype, is_lu);
+ if (!lchan) {
+ LOGP(DRSL, LOGL_NOTICE, "BTS %d CHAN RQD: no resources for %s 0x%x\n",
+ msg->lchan->ts->trx->bts->nr, gsm_lchant_name(lctype), rqd_ref->ra);
+ counter_inc(bts->network->stats.chreq.no_channel);
+ /* FIXME gather multiple CHAN RQD and reject up to 4 at the same time */
+ if (bts->network->T3122)
+ rsl_send_imm_ass_rej(bts, 1, rqd_ref, bts->network->T3122 & 0xff);
+ return -ENOMEM;
+ }
+
+ if (lchan->state != LCHAN_S_NONE)
+ LOGP(DRSL, LOGL_NOTICE, "%s lchan_alloc() returned channel "
+ "in state %s\n", gsm_lchan_name(lchan),
+ gsm_lchans_name(lchan->state));
+ rsl_lchan_set_state(lchan, LCHAN_S_ACT_REQ);
+
+ /* save the RACH data as we need it after the CHAN ACT ACK */
+ lchan->rqd_ref = talloc_zero(bts, struct gsm48_req_ref);
+ if (!lchan->rqd_ref) {
+ LOGP(DRSL, LOGL_ERROR, "Failed to allocate gsm48_req_ref.\n");
+ lchan_free(lchan);
+ return -ENOMEM;
+ }
+
+ memcpy(lchan->rqd_ref, rqd_ref, sizeof(*rqd_ref));
+ lchan->rqd_ta = rqd_ta;
+
+ ts_number = lchan->ts->nr;
+ arfcn = lchan->ts->trx->arfcn;
+ subch = lchan->nr;
+
+ lchan->encr.alg_id = RSL_ENC_ALG_A5(0); /* no encryption */
+ lchan->ms_power = ms_pwr_ctl_lvl(bts->band, bts->ms_max_power);
+ lchan->bs_power = 0; /* 0dB reduction, output power = Pn */
+ lchan->rsl_cmode = RSL_CMOD_SPD_SIGN;
+ lchan->tch_mode = GSM48_CMODE_SIGN;
+
+ /* FIXME: Start another timer or assume the BTS sends a ACK/NACK? */
+ rsl_chan_activate_lchan(lchan, 0x00, rqd_ta, 0);
+
+ DEBUGP(DRSL, "%s Activating ARFCN(%u) SS(%u) lctype %s "
+ "r=%s ra=0x%02x\n", gsm_lchan_name(lchan), arfcn, subch,
+ gsm_lchant_name(lchan->type), gsm_chreq_name(chreq_reason),
+ rqd_ref->ra);
+ return 0;
+}
+
+static int rsl_send_imm_assignment(struct gsm_lchan *lchan)
+{
+ struct gsm_bts *bts = lchan->ts->trx->bts;
+ u_int8_t buf[GSM_MACBLOCK_LEN];
+ struct gsm48_imm_ass *ia = (struct gsm48_imm_ass *) buf;
+
+ /* create IMMEDIATE ASSIGN 04.08 messge */
+ memset(ia, 0, sizeof(*ia));
+ /* we set ia->l2_plen once we know the length of the MA below */
+ ia->proto_discr = GSM48_PDISC_RR;
+ ia->msg_type = GSM48_MT_RR_IMM_ASS;
+ ia->page_mode = GSM48_PM_SAME;
+ gsm48_lchan2chan_desc(&ia->chan_desc, lchan);
+
+ /* use request reference extracted from CHAN_RQD */
+ memcpy(&ia->req_ref, lchan->rqd_ref, sizeof(ia->req_ref));
+ ia->timing_advance = lchan->rqd_ta;
+ if (!lchan->ts->hopping.enabled) {
+ ia->mob_alloc_len = 0;
+ } else {
+ ia->mob_alloc_len = lchan->ts->hopping.ma_len;
+ memcpy(ia->mob_alloc, lchan->ts->hopping.ma_data, ia->mob_alloc_len);
+ }
+ /* we need to subtract 1 byte from sizeof(*ia) since ia includes the l2_plen field */
+ ia->l2_plen = GSM48_LEN2PLEN((sizeof(*ia)-1) + ia->mob_alloc_len);
+
+ /* Start timer T3101 to wait for GSM48_MT_RR_PAG_RESP */
+ lchan->T3101.cb = t3101_expired;
+ lchan->T3101.data = lchan;
+ bsc_schedule_timer(&lchan->T3101, bts->network->T3101, 0);
+
+ /* send IMMEDIATE ASSIGN CMD on RSL to BTS (to send on CCCH to MS) */
+ return rsl_imm_assign_cmd(bts, sizeof(*ia)+ia->mob_alloc_len, (u_int8_t *) ia);
+}
+
+/* MS has requested a channel on the RACH */
+static int rsl_rx_ccch_load(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg);
+ u_int16_t pg_buf_space;
+ u_int16_t rach_slot_count = -1;
+ u_int16_t rach_busy_count = -1;
+ u_int16_t rach_access_count = -1;
+
+ switch (rslh->data[0]) {
+ case RSL_IE_PAGING_LOAD:
+ pg_buf_space = rslh->data[1] << 8 | rslh->data[2];
+ if (is_ipaccess_bts(msg->trx->bts) && pg_buf_space == 0xffff) {
+ /* paging load below configured threshold, use 50 as default */
+ pg_buf_space = 50;
+ }
+ paging_update_buffer_space(msg->trx->bts, pg_buf_space);
+ break;
+ case RSL_IE_RACH_LOAD:
+ if (msg->data_len >= 7) {
+ rach_slot_count = rslh->data[2] << 8 | rslh->data[3];
+ rach_busy_count = rslh->data[4] << 8 | rslh->data[5];
+ rach_access_count = rslh->data[6] << 8 | rslh->data[7];
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int abis_rsl_rx_cchan(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *rslh = msgb_l2(msg);
+ int rc = 0;
+
+ msg->lchan = lchan_lookup(msg->trx, rslh->chan_nr);
+
+ switch (rslh->c.msg_type) {
+ case RSL_MT_CHAN_RQD:
+ /* MS has requested a channel on the RACH */
+ rc = rsl_rx_chan_rqd(msg);
+ break;
+ case RSL_MT_CCCH_LOAD_IND:
+ /* current load on the CCCH */
+ rc = rsl_rx_ccch_load(msg);
+ break;
+ case RSL_MT_DELETE_IND:
+ /* CCCH overloaded, IMM_ASSIGN was dropped */
+ case RSL_MT_CBCH_LOAD_IND:
+ /* current load on the CBCH */
+ LOGP(DRSL, LOGL_NOTICE, "Unimplemented Abis RSL TRX message "
+ "type 0x%02x\n", rslh->c.msg_type);
+ break;
+ default:
+ LOGP(DRSL, LOGL_NOTICE, "Unknown Abis RSL TRX message type "
+ "0x%02x\n", rslh->c.msg_type);
+ return -EINVAL;
+ }
+
+ return rc;
+}
+
+static int rsl_rx_rll_err_ind(struct msgb *msg)
+{
+ struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
+ u_int8_t *rlm_cause = rllh->data;
+
+ LOGP(DRLL, LOGL_ERROR, "%s ERROR INDICATION cause=%s\n",
+ gsm_lchan_name(msg->lchan),
+ rsl_rlm_cause_name(rlm_cause[1]));
+
+ rll_indication(msg->lchan, rllh->link_id, BSC_RLLR_IND_ERR_IND);
+
+ if (rlm_cause[1] == RLL_CAUSE_T200_EXPIRED) {
+ counter_inc(msg->lchan->ts->trx->bts->network->stats.chan.rll_err);
+ return rsl_rf_chan_release(msg->lchan, 1);
+ }
+
+ return 0;
+}
+
+static void rsl_handle_release(struct gsm_lchan *lchan)
+{
+ int sapi;
+ struct gsm_bts *bts;
+
+ /* maybe we have only brought down one RLL */
+ if (lchan->state != LCHAN_S_REL_REQ)
+ return;
+
+ for (sapi = 0; sapi < ARRAY_SIZE(lchan->sapis); ++sapi) {
+ if (lchan->sapis[sapi] == LCHAN_SAPI_UNUSED)
+ continue;
+ LOGP(DRSL, LOGL_DEBUG, "%s waiting for SAPI=%d to be released.\n",
+ gsm_lchan_name(lchan), sapi);
+ return;
+ }
+
+
+
+ /* wait a bit to send the RF Channel Release */
+ lchan->T3111.cb = t3111_expired;
+ lchan->T3111.data = lchan;
+ bts = lchan->ts->trx->bts;
+ bsc_schedule_timer(&lchan->T3111, bts->network->T3111, 0);
+}
+
+/* ESTABLISH INDICATION, LOCATION AREA UPDATE REQUEST
+ 0x02, 0x06,
+ 0x01, 0x20,
+ 0x02, 0x00,
+ 0x0b, 0x00, 0x0f, 0x05, 0x08, ... */
+
+static int abis_rsl_rx_rll(struct msgb *msg)
+{
+ struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
+ int rc = 0;
+ char *ts_name;
+ u_int8_t sapi = rllh->link_id & 7;
+
+ msg->lchan = lchan_lookup(msg->trx, rllh->chan_nr);
+ ts_name = gsm_lchan_name(msg->lchan);
+ DEBUGP(DRLL, "%s SAPI=%u ", ts_name, sapi);
+
+ switch (rllh->c.msg_type) {
+ case RSL_MT_DATA_IND:
+ DEBUGPC(DRLL, "DATA INDICATION\n");
+ if (msgb_l2len(msg) >
+ sizeof(struct abis_rsl_common_hdr) + sizeof(*rllh) &&
+ rllh->data[0] == RSL_IE_L3_INFO) {
+ msg->l3h = &rllh->data[3];
+ return gsm0408_rcvmsg(msg, rllh->link_id);
+ }
+ break;
+ case RSL_MT_EST_IND:
+ DEBUGPC(DRLL, "ESTABLISH INDICATION\n");
+ /* lchan is established, stop T3101 */
+ msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_MS;
+ bsc_del_timer(&msg->lchan->T3101);
+ if (msgb_l2len(msg) >
+ sizeof(struct abis_rsl_common_hdr) + sizeof(*rllh) &&
+ rllh->data[0] == RSL_IE_L3_INFO) {
+ msg->l3h = &rllh->data[3];
+ return gsm0408_rcvmsg(msg, rllh->link_id);
+ }
+ break;
+ case RSL_MT_EST_CONF:
+ DEBUGPC(DRLL, "ESTABLISH CONFIRM\n");
+ msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_NET;
+ rll_indication(msg->lchan, rllh->link_id,
+ BSC_RLLR_IND_EST_CONF);
+ break;
+ case RSL_MT_REL_IND:
+ /* BTS informs us of having received DISC from MS */
+ DEBUGPC(DRLL, "RELEASE INDICATION\n");
+ msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_UNUSED;
+ rll_indication(msg->lchan, rllh->link_id,
+ BSC_RLLR_IND_REL_IND);
+ rsl_handle_release(msg->lchan);
+ rsl_lchan_rll_release(msg->lchan, rllh->link_id);
+ break;
+ case RSL_MT_REL_CONF:
+ /* BTS informs us of having received UA from MS,
+ * in response to DISC that we've sent earlier */
+ DEBUGPC(DRLL, "RELEASE CONFIRMATION\n");
+ msg->lchan->sapis[rllh->link_id & 0x7] = LCHAN_SAPI_UNUSED;
+ rsl_handle_release(msg->lchan);
+ rsl_lchan_rll_release(msg->lchan, rllh->link_id);
+ break;
+ case RSL_MT_ERROR_IND:
+ rc = rsl_rx_rll_err_ind(msg);
+ break;
+ case RSL_MT_UNIT_DATA_IND:
+ LOGP(DRLL, LOGL_NOTICE, "unimplemented Abis RLL message "
+ "type 0x%02x\n", rllh->c.msg_type);
+ break;
+ default:
+ LOGP(DRLL, LOGL_NOTICE, "unknown Abis RLL message "
+ "type 0x%02x\n", rllh->c.msg_type);
+ }
+ return rc;
+}
+
+static u_int8_t ipa_smod_s_for_lchan(struct gsm_lchan *lchan)
+{
+ switch (lchan->tch_mode) {
+ case GSM48_CMODE_SPEECH_V1:
+ switch (lchan->type) {
+ case GSM_LCHAN_TCH_F:
+ return 0x00;
+ case GSM_LCHAN_TCH_H:
+ return 0x03;
+ default:
+ break;
+ }
+ case GSM48_CMODE_SPEECH_EFR:
+ switch (lchan->type) {
+ case GSM_LCHAN_TCH_F:
+ return 0x01;
+ /* there's no half-rate EFR */
+ default:
+ break;
+ }
+ case GSM48_CMODE_SPEECH_AMR:
+ switch (lchan->type) {
+ case GSM_LCHAN_TCH_F:
+ return 0x02;
+ case GSM_LCHAN_TCH_H:
+ return 0x05;
+ default:
+ break;
+ }
+ default:
+ break;
+ }
+ LOGP(DRSL, LOGL_ERROR, "Cannot determine ip.access speech mode for "
+ "tch_mode == 0x%02x\n", lchan->tch_mode);
+ return 0;
+}
+
+static u_int8_t ipa_rtp_pt_for_lchan(struct gsm_lchan *lchan)
+{
+ struct gsm_network *net = lchan->ts->trx->bts->network;
+
+ /* allow to hardcode the rtp payload */
+ if (net->hardcoded_rtp_payload != 0)
+ return net->hardcoded_rtp_payload;
+
+ switch (lchan->tch_mode) {
+ case GSM48_CMODE_SPEECH_V1:
+ switch (lchan->type) {
+ case GSM_LCHAN_TCH_F:
+ return RTP_PT_GSM_FULL;
+ case GSM_LCHAN_TCH_H:
+ return RTP_PT_GSM_HALF;
+ default:
+ break;
+ }
+ case GSM48_CMODE_SPEECH_EFR:
+ switch (lchan->type) {
+ case GSM_LCHAN_TCH_F:
+ return RTP_PT_GSM_EFR;
+ /* there's no half-rate EFR */
+ default:
+ break;
+ }
+ case GSM48_CMODE_SPEECH_AMR:
+ switch (lchan->type) {
+ case GSM_LCHAN_TCH_F:
+ return RTP_PT_AMR_FULL;
+ case GSM_LCHAN_TCH_H:
+ return RTP_PT_AMR_HALF;
+ default:
+ break;
+ }
+ default:
+ break;
+ }
+ LOGP(DRSL, LOGL_ERROR, "Cannot determine ip.access rtp payload type for "
+ "tch_mode == 0x%02x\n & lchan_type == %d",
+ lchan->tch_mode, lchan->type);
+ return 0;
+}
+
+/* ip.access specific RSL extensions */
+static void ipac_parse_rtp(struct gsm_lchan *lchan, struct tlv_parsed *tv)
+{
+ struct in_addr ip;
+ u_int16_t port, conn_id;
+
+ if (TLVP_PRESENT(tv, RSL_IE_IPAC_LOCAL_IP)) {
+ ip.s_addr = *((u_int32_t *) TLVP_VAL(tv, RSL_IE_IPAC_LOCAL_IP));
+ DEBUGPC(DRSL, "LOCAL_IP=%s ", inet_ntoa(ip));
+ lchan->abis_ip.bound_ip = ntohl(ip.s_addr);
+ }
+
+ if (TLVP_PRESENT(tv, RSL_IE_IPAC_LOCAL_PORT)) {
+ port = *((u_int16_t *) TLVP_VAL(tv, RSL_IE_IPAC_LOCAL_PORT));
+ port = ntohs(port);
+ DEBUGPC(DRSL, "LOCAL_PORT=%u ", port);
+ lchan->abis_ip.bound_port = port;
+ }
+
+ if (TLVP_PRESENT(tv, RSL_IE_IPAC_CONN_ID)) {
+ conn_id = *((u_int16_t *) TLVP_VAL(tv, RSL_IE_IPAC_CONN_ID));
+ conn_id = ntohs(conn_id);
+ DEBUGPC(DRSL, "CON_ID=%u ", conn_id);
+ lchan->abis_ip.conn_id = conn_id;
+ }
+
+ if (TLVP_PRESENT(tv, RSL_IE_IPAC_RTP_PAYLOAD2)) {
+ lchan->abis_ip.rtp_payload2 =
+ *TLVP_VAL(tv, RSL_IE_IPAC_RTP_PAYLOAD2);
+ DEBUGPC(DRSL, "RTP_PAYLOAD2=0x%02x ",
+ lchan->abis_ip.rtp_payload2);
+ }
+
+ if (TLVP_PRESENT(tv, RSL_IE_IPAC_SPEECH_MODE)) {
+ lchan->abis_ip.speech_mode =
+ *TLVP_VAL(tv, RSL_IE_IPAC_SPEECH_MODE);
+ DEBUGPC(DRSL, "speech_mode=0x%02x ",
+ lchan->abis_ip.speech_mode);
+ }
+
+ if (TLVP_PRESENT(tv, RSL_IE_IPAC_REMOTE_IP)) {
+ ip.s_addr = *((u_int32_t *) TLVP_VAL(tv, RSL_IE_IPAC_REMOTE_IP));
+ DEBUGPC(DRSL, "REMOTE_IP=%s ", inet_ntoa(ip));
+ lchan->abis_ip.connect_ip = ntohl(ip.s_addr);
+ }
+
+ if (TLVP_PRESENT(tv, RSL_IE_IPAC_REMOTE_PORT)) {
+ port = *((u_int16_t *) TLVP_VAL(tv, RSL_IE_IPAC_REMOTE_PORT));
+ port = ntohs(port);
+ DEBUGPC(DRSL, "REMOTE_PORT=%u ", port);
+ lchan->abis_ip.connect_port = port;
+ }
+}
+
+int rsl_ipacc_crcx(struct gsm_lchan *lchan)
+{
+ struct msgb *msg = rsl_msgb_alloc();
+ struct abis_rsl_dchan_hdr *dh;
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_IPAC_CRCX);
+ dh->c.msg_discr = ABIS_RSL_MDISC_IPACCESS;
+ dh->chan_nr = lchan2chan_nr(lchan);
+
+ /* 0x1- == receive-only, 0x-1 == EFR codec */
+ lchan->abis_ip.speech_mode = 0x10 | ipa_smod_s_for_lchan(lchan);
+ lchan->abis_ip.rtp_payload = ipa_rtp_pt_for_lchan(lchan);
+ msgb_tv_put(msg, RSL_IE_IPAC_SPEECH_MODE, lchan->abis_ip.speech_mode);
+ msgb_tv_put(msg, RSL_IE_IPAC_RTP_PAYLOAD, lchan->abis_ip.rtp_payload);
+
+ DEBUGP(DRSL, "%s IPAC_BIND speech_mode=0x%02x RTP_PAYLOAD=%d\n",
+ gsm_lchan_name(lchan), lchan->abis_ip.speech_mode,
+ lchan->abis_ip.rtp_payload);
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+int rsl_ipacc_mdcx(struct gsm_lchan *lchan, u_int32_t ip, u_int16_t port,
+ u_int8_t rtp_payload2)
+{
+ struct msgb *msg = rsl_msgb_alloc();
+ struct abis_rsl_dchan_hdr *dh;
+ u_int32_t *att_ip;
+ struct in_addr ia;
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, RSL_MT_IPAC_MDCX);
+ dh->c.msg_discr = ABIS_RSL_MDISC_IPACCESS;
+ dh->chan_nr = lchan2chan_nr(lchan);
+
+ /* we need to store these now as MDCX_ACK does not return them :( */
+ lchan->abis_ip.rtp_payload2 = rtp_payload2;
+ lchan->abis_ip.connect_port = port;
+ lchan->abis_ip.connect_ip = ip;
+
+ /* 0x0- == both directions, 0x-1 == EFR codec */
+ lchan->abis_ip.speech_mode = 0x00 | ipa_smod_s_for_lchan(lchan);
+ lchan->abis_ip.rtp_payload = ipa_rtp_pt_for_lchan(lchan);
+
+ ia.s_addr = htonl(ip);
+ DEBUGP(DRSL, "%s IPAC_MDCX IP=%s PORT=%d RTP_PAYLOAD=%d RTP_PAYLOAD2=%d "
+ "CONN_ID=%d speech_mode=0x%02x\n", gsm_lchan_name(lchan),
+ inet_ntoa(ia), port, lchan->abis_ip.rtp_payload, rtp_payload2,
+ lchan->abis_ip.conn_id, lchan->abis_ip.speech_mode);
+
+ msgb_tv16_put(msg, RSL_IE_IPAC_CONN_ID, lchan->abis_ip.conn_id);
+ msgb_v_put(msg, RSL_IE_IPAC_REMOTE_IP);
+ att_ip = (u_int32_t *) msgb_put(msg, sizeof(ip));
+ *att_ip = ia.s_addr;
+ msgb_tv16_put(msg, RSL_IE_IPAC_REMOTE_PORT, port);
+ msgb_tv_put(msg, RSL_IE_IPAC_SPEECH_MODE, lchan->abis_ip.speech_mode);
+ msgb_tv_put(msg, RSL_IE_IPAC_RTP_PAYLOAD, lchan->abis_ip.rtp_payload);
+ if (rtp_payload2)
+ msgb_tv_put(msg, RSL_IE_IPAC_RTP_PAYLOAD2, rtp_payload2);
+
+ msg->trx = lchan->ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+/* tell BTS to connect RTP stream to our local RTP socket */
+int rsl_ipacc_mdcx_to_rtpsock(struct gsm_lchan *lchan)
+{
+ struct rtp_socket *rs = lchan->abis_ip.rtp_socket;
+ int rc;
+
+ rc = rsl_ipacc_mdcx(lchan, ntohl(rs->rtp.sin_local.sin_addr.s_addr),
+ ntohs(rs->rtp.sin_local.sin_port),
+ /* FIXME: use RTP payload of bound socket, not BTS*/
+ lchan->abis_ip.rtp_payload2);
+
+ return rc;
+}
+
+int rsl_ipacc_pdch_activate(struct gsm_bts_trx_ts *ts, int act)
+{
+ struct msgb *msg = rsl_msgb_alloc();
+ struct abis_rsl_dchan_hdr *dh;
+ u_int8_t msg_type;
+
+ if (act)
+ msg_type = RSL_MT_IPAC_PDCH_ACT;
+ else
+ msg_type = RSL_MT_IPAC_PDCH_DEACT;
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(msg, sizeof(*dh));
+ init_dchan_hdr(dh, msg_type);
+ dh->c.msg_discr = ABIS_RSL_MDISC_DED_CHAN;
+ dh->chan_nr = ts2chan_nr(ts, 0);
+
+ DEBUGP(DRSL, "%s IPAC_PDCH_%sACT\n", gsm_ts_name(ts),
+ act ? "" : "DE");
+
+ msg->trx = ts->trx;
+
+ return abis_rsl_sendmsg(msg);
+}
+
+static int abis_rsl_rx_ipacc_crcx_ack(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
+ struct tlv_parsed tv;
+ struct gsm_lchan *lchan = msg->lchan;
+
+ /* the BTS has acknowledged a local bind, it now tells us the IP
+ * address and port number to which it has bound the given logical
+ * channel */
+
+ rsl_tlv_parse(&tv, dh->data, msgb_l2len(msg)-sizeof(*dh));
+ if (!TLVP_PRESENT(&tv, RSL_IE_IPAC_LOCAL_PORT) ||
+ !TLVP_PRESENT(&tv, RSL_IE_IPAC_LOCAL_IP) ||
+ !TLVP_PRESENT(&tv, RSL_IE_IPAC_CONN_ID)) {
+ LOGP(DRSL, LOGL_NOTICE, "mandatory IE missing");
+ return -EINVAL;
+ }
+
+ ipac_parse_rtp(lchan, &tv);
+
+ dispatch_signal(SS_ABISIP, S_ABISIP_CRCX_ACK, msg->lchan);
+
+ return 0;
+}
+
+static int abis_rsl_rx_ipacc_mdcx_ack(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
+ struct tlv_parsed tv;
+ struct gsm_lchan *lchan = msg->lchan;
+
+ /* the BTS has acknowledged a remote connect request and
+ * it now tells us the IP address and port number to which it has
+ * connected the given logical channel */
+
+ rsl_tlv_parse(&tv, dh->data, msgb_l2len(msg)-sizeof(*dh));
+ ipac_parse_rtp(lchan, &tv);
+ dispatch_signal(SS_ABISIP, S_ABISIP_MDCX_ACK, msg->lchan);
+
+ return 0;
+}
+
+static int abis_rsl_rx_ipacc_dlcx_ind(struct msgb *msg)
+{
+ struct abis_rsl_dchan_hdr *dh = msgb_l2(msg);
+ struct tlv_parsed tv;
+
+ rsl_tlv_parse(&tv, dh->data, msgb_l2len(msg)-sizeof(*dh));
+
+ if (TLVP_PRESENT(&tv, RSL_IE_CAUSE))
+ print_rsl_cause(LOGL_DEBUG, TLVP_VAL(&tv, RSL_IE_CAUSE),
+ TLVP_LEN(&tv, RSL_IE_CAUSE));
+
+ dispatch_signal(SS_ABISIP, S_ABISIP_DLCX_IND, msg->lchan);
+
+ return 0;
+}
+
+static int abis_rsl_rx_ipacc(struct msgb *msg)
+{
+ struct abis_rsl_rll_hdr *rllh = msgb_l2(msg);
+ char *ts_name;
+ int rc = 0;
+
+ msg->lchan = lchan_lookup(msg->trx, rllh->chan_nr);
+ ts_name = gsm_lchan_name(msg->lchan);
+
+ switch (rllh->c.msg_type) {
+ case RSL_MT_IPAC_CRCX_ACK:
+ DEBUGP(DRSL, "%s IPAC_CRCX_ACK ", ts_name);
+ rc = abis_rsl_rx_ipacc_crcx_ack(msg);
+ break;
+ case RSL_MT_IPAC_CRCX_NACK:
+ /* somehow the BTS was unable to bind the lchan to its local
+ * port?!? */
+ LOGP(DRSL, LOGL_ERROR, "%s IPAC_CRCX_NACK\n", ts_name);
+ break;
+ case RSL_MT_IPAC_MDCX_ACK:
+ /* the BTS tells us that a connect operation was successful */
+ DEBUGP(DRSL, "%s IPAC_MDCX_ACK ", ts_name);
+ rc = abis_rsl_rx_ipacc_mdcx_ack(msg);
+ break;
+ case RSL_MT_IPAC_MDCX_NACK:
+ /* somehow the BTS was unable to connect the lchan to a remote
+ * port */
+ LOGP(DRSL, LOGL_ERROR, "%s IPAC_MDCX_NACK\n", ts_name);
+ break;
+ case RSL_MT_IPAC_DLCX_IND:
+ DEBUGP(DRSL, "%s IPAC_DLCX_IND ", ts_name);
+ rc = abis_rsl_rx_ipacc_dlcx_ind(msg);
+ break;
+ default:
+ LOGP(DRSL, LOGL_NOTICE, "Unknown ip.access msg_type 0x%02x\n",
+ rllh->c.msg_type);
+ break;
+ }
+ DEBUGPC(DRSL, "\n");
+
+ return rc;
+}
+
+
+/* Entry-point where L2 RSL from BTS enters */
+int abis_rsl_rcvmsg(struct msgb *msg)
+{
+ struct abis_rsl_common_hdr *rslh;
+ int rc = 0;
+
+ if (!msg) {
+ DEBUGP(DRSL, "Empty RSL msg?..\n");
+ return -1;
+ }
+
+ if (msgb_l2len(msg) < sizeof(*rslh)) {
+ DEBUGP(DRSL, "Truncated RSL message with l2len: %u\n", msgb_l2len(msg));
+ return -1;
+ }
+
+ rslh = msgb_l2(msg);
+
+ switch (rslh->msg_discr & 0xfe) {
+ case ABIS_RSL_MDISC_RLL:
+ rc = abis_rsl_rx_rll(msg);
+ break;
+ case ABIS_RSL_MDISC_DED_CHAN:
+ rc = abis_rsl_rx_dchan(msg);
+ break;
+ case ABIS_RSL_MDISC_COM_CHAN:
+ rc = abis_rsl_rx_cchan(msg);
+ break;
+ case ABIS_RSL_MDISC_TRX:
+ rc = abis_rsl_rx_trx(msg);
+ break;
+ case ABIS_RSL_MDISC_LOC:
+ LOGP(DRSL, LOGL_NOTICE, "unimplemented RSL msg disc 0x%02x\n",
+ rslh->msg_discr);
+ break;
+ case ABIS_RSL_MDISC_IPACCESS:
+ rc = abis_rsl_rx_ipacc(msg);
+ break;
+ default:
+ LOGP(DRSL, LOGL_NOTICE, "unknown RSL message discriminator "
+ "0x%02x\n", rslh->msg_discr);
+ return -EINVAL;
+ }
+ msgb_free(msg);
+ return rc;
+}
+
+/* From Table 10.5.33 of GSM 04.08 */
+int rsl_number_of_paging_subchannels(struct gsm_bts *bts)
+{
+ if (bts->si_common.chan_desc.ccch_conf == RSL_BCCH_CCCH_CONF_1_C) {
+ return MAX(1, (3 - bts->si_common.chan_desc.bs_ag_blks_res))
+ * (bts->si_common.chan_desc.bs_pa_mfrms + 2);
+ } else {
+ return (9 - bts->si_common.chan_desc.bs_ag_blks_res)
+ * (bts->si_common.chan_desc.bs_pa_mfrms + 2);
+ }
+}
+
+int rsl_sms_cb_command(struct gsm_bts *bts, uint8_t chan_number,
+ uint8_t cb_command, const uint8_t *data, int len)
+{
+ struct abis_rsl_dchan_hdr *dh;
+ struct msgb *cb_cmd;
+
+ cb_cmd = rsl_msgb_alloc();
+ if (!cb_cmd)
+ return -1;
+
+ dh = (struct abis_rsl_dchan_hdr *) msgb_put(cb_cmd, sizeof*dh);
+ init_dchan_hdr(dh, RSL_MT_SMS_BC_CMD);
+ dh->chan_nr = RSL_CHAN_SDCCH4_ACCH; /* TODO: check the chan config */
+
+ msgb_tv_put(cb_cmd, RSL_IE_CB_CMD_TYPE, cb_command);
+ msgb_tlv_put(cb_cmd, RSL_IE_SMSCB_MSG, len, data);
+
+ cb_cmd->trx = bts->c0;
+
+ return abis_rsl_sendmsg(cb_cmd);
+}