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-rw-r--r--src/host/layer23/src/misc/app_ccch_scan.c481
1 files changed, 481 insertions, 0 deletions
diff --git a/src/host/layer23/src/misc/app_ccch_scan.c b/src/host/layer23/src/misc/app_ccch_scan.c
new file mode 100644
index 00000000..4e45a427
--- /dev/null
+++ b/src/host/layer23/src/misc/app_ccch_scan.c
@@ -0,0 +1,481 @@
+/* CCCH passive sniffer */
+/* (C) 2010-2011 by Holger Hans Peter Freyther
+ * (C) 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 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 <stdint.h>
+#include <errno.h>
+#include <stdio.h>
+
+#include <osmocore/msgb.h>
+#include <osmocore/rsl.h>
+#include <osmocore/tlv.h>
+#include <osmocore/gsm48_ie.h>
+#include <osmocore/gsm48.h>
+#include <osmocore/signal.h>
+#include <osmocore/protocol/gsm_04_08.h>
+
+#include <osmocom/bb/common/logging.h>
+#include <osmocom/bb/common/lapdm.h>
+#include <osmocom/bb/misc/rslms.h>
+#include <osmocom/bb/misc/layer3.h>
+#include <osmocom/bb/common/osmocom_data.h>
+#include <osmocom/bb/common/l1ctl.h>
+#include <osmocom/bb/common/l23_app.h>
+
+static struct {
+ int has_si1;
+ int ccch_mode;
+ int ccch_enabled;
+ int rach_count;
+ struct gsm_sysinfo_freq cell_arfcns[1024];
+} app_state;
+
+
+static void dump_bcch(struct osmocom_ms *ms, uint8_t tc, const uint8_t *data)
+{
+ struct gsm48_system_information_type_header *si_hdr;
+ si_hdr = (struct gsm48_system_information_type_header *) data;
+
+ /* GSM 05.02 ยง6.3.1.3 Mapping of BCCH data */
+ switch (si_hdr->system_information) {
+ case GSM48_MT_RR_SYSINFO_1:
+#ifdef BCCH_TC_CHECK
+ if (tc != 0)
+ LOGP(DRR, LOGL_ERROR, "SI1 on the wrong TC: %d\n", tc);
+#endif
+ if (!app_state.has_si1) {
+ struct gsm48_system_information_type_1 *si1 =
+ (struct gsm48_system_information_type_1 *)data;
+
+ gsm48_decode_freq_list(app_state.cell_arfcns,
+ si1->cell_channel_description,
+ sizeof(si1->cell_channel_description),
+ 0xff, 0x01);
+
+ app_state.has_si1 = 1;
+ LOGP(DRR, LOGL_ERROR, "SI1 received.\n");
+ }
+ break;
+ case GSM48_MT_RR_SYSINFO_2:
+#ifdef BCCH_TC_CHECK
+ if (tc != 1)
+ LOGP(DRR, LOGL_ERROR, "SI2 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_3:
+#ifdef BCCH_TC_CHECK
+ if (tc != 2 && tc != 6)
+ LOGP(DRR, LOGL_ERROR, "SI3 on the wrong TC: %d\n", tc);
+#endif
+ if (app_state.ccch_mode == CCCH_MODE_NONE) {
+ struct gsm48_system_information_type_3 *si3 =
+ (struct gsm48_system_information_type_3 *)data;
+
+ if (si3->control_channel_desc.ccch_conf == RSL_BCCH_CCCH_CONF_1_C)
+ app_state.ccch_mode = CCCH_MODE_COMBINED;
+ else
+ app_state.ccch_mode = CCCH_MODE_NON_COMBINED;
+
+ l1ctl_tx_ccch_mode_req(ms, app_state.ccch_mode);
+ }
+ break;
+ case GSM48_MT_RR_SYSINFO_4:
+#ifdef BCCH_TC_CHECK
+ if (tc != 3 && tc != 7)
+ LOGP(DRR, LOGL_ERROR, "SI4 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_5:
+ break;
+ case GSM48_MT_RR_SYSINFO_6:
+ break;
+ case GSM48_MT_RR_SYSINFO_7:
+#ifdef BCCH_TC_CHECK
+ if (tc != 7)
+ LOGP(DRR, LOGL_ERROR, "SI7 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_8:
+#ifdef BCCH_TC_CHECK
+ if (tc != 3)
+ LOGP(DRR, LOGL_ERROR, "SI8 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_9:
+#ifdef BCCH_TC_CHECK
+ if (tc != 4)
+ LOGP(DRR, LOGL_ERROR, "SI9 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_13:
+#ifdef BCCH_TC_CHECK
+ if (tc != 4 && tc != 0)
+ LOGP(DRR, LOGL_ERROR, "SI13 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_16:
+#ifdef BCCH_TC_CHECK
+ if (tc != 6)
+ LOGP(DRR, LOGL_ERROR, "SI16 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_17:
+#ifdef BCCH_TC_CHECK
+ if (tc != 2)
+ LOGP(DRR, LOGL_ERROR, "SI17 on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_2bis:
+#ifdef BCCH_TC_CHECK
+ if (tc != 5)
+ LOGP(DRR, LOGL_ERROR, "SI2bis on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_2ter:
+#ifdef BCCH_TC_CHECK
+ if (tc != 5 && tc != 4)
+ LOGP(DRR, LOGL_ERROR, "SI2ter on the wrong TC: %d\n", tc);
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_5bis:
+ break;
+ case GSM48_MT_RR_SYSINFO_5ter:
+ break;
+ default:
+ fprintf(stderr, "\tUnknown SI");
+ break;
+ };
+}
+
+
+/**
+ * This method used to send a l1ctl_tx_dm_est_req_h0 or
+ * a l1ctl_tx_dm_est_req_h1 to the layer1 to follow this
+ * assignment. The code has been removed.
+ */
+static int gsm48_rx_imm_ass(struct msgb *msg, struct osmocom_ms *ms)
+{
+ struct gsm48_imm_ass *ia = msgb_l3(msg);
+ uint8_t ch_type, ch_subch, ch_ts;
+
+ /* Discard packet TBF assignement */
+ if (ia->page_mode & 0xf0)
+ return 0;
+
+ /* FIXME: compare RA and GSM time with when we sent RACH req */
+
+ rsl_dec_chan_nr(ia->chan_desc.chan_nr, &ch_type, &ch_subch, &ch_ts);
+
+ if (!ia->chan_desc.h0.h) {
+ /* Non-hopping */
+ uint16_t arfcn;
+
+ arfcn = ia->chan_desc.h0.arfcn_low | (ia->chan_desc.h0.arfcn_high << 8);
+
+ LOGP(DRR, LOGL_NOTICE, "GSM48 IMM ASS (ra=0x%02x, chan_nr=0x%02x, "
+ "ARFCN=%u, TS=%u, SS=%u, TSC=%u) ", ia->req_ref.ra,
+ ia->chan_desc.chan_nr, arfcn, ch_ts, ch_subch,
+ ia->chan_desc.h0.tsc);
+
+ } else {
+ /* Hopping */
+ uint8_t maio, hsn, ma_len;
+ uint16_t ma[64], arfcn;
+ int i, j, k;
+
+ hsn = ia->chan_desc.h1.hsn;
+ maio = ia->chan_desc.h1.maio_low | (ia->chan_desc.h1.maio_high << 2);
+
+ LOGP(DRR, LOGL_NOTICE, "GSM48 IMM ASS (ra=0x%02x, chan_nr=0x%02x, "
+ "HSN=%u, MAIO=%u, TS=%u, SS=%u, TSC=%u) ", ia->req_ref.ra,
+ ia->chan_desc.chan_nr, hsn, maio, ch_ts, ch_subch,
+ ia->chan_desc.h1.tsc);
+
+ /* decode mobile allocation */
+ ma_len = 0;
+ for (i=1, j=0; i<=1024; i++) {
+ arfcn = i & 1023;
+ if (app_state.cell_arfcns[arfcn].mask & 0x01) {
+ k = ia->mob_alloc_len - (j>>3) - 1;
+ if (ia->mob_alloc[k] & (1 << (j&7))) {
+ ma[ma_len++] = arfcn;
+ }
+ j++;
+ }
+ }
+ }
+
+ LOGPC(DRR, LOGL_NOTICE, "\n");
+ return 0;
+}
+
+static const char *pag_print_mode(int mode)
+{
+ switch (mode) {
+ case 0:
+ return "Normal paging";
+ case 1:
+ return "Extended paging";
+ case 2:
+ return "Paging reorganization";
+ case 3:
+ return "Same as before";
+ default:
+ return "invalid";
+ }
+}
+
+static char *chan_need(int need)
+{
+ switch (need) {
+ case 0:
+ return "any";
+ case 1:
+ return "sdch";
+ case 2:
+ return "tch/f";
+ case 3:
+ return "tch/h";
+ default:
+ return "invalid";
+ }
+}
+
+static char *mi_type_to_string(int type)
+{
+ switch (type) {
+ case GSM_MI_TYPE_NONE:
+ return "none";
+ case GSM_MI_TYPE_IMSI:
+ return "imsi";
+ case GSM_MI_TYPE_IMEI:
+ return "imei";
+ case GSM_MI_TYPE_IMEISV:
+ return "imeisv";
+ case GSM_MI_TYPE_TMSI:
+ return "tmsi";
+ default:
+ return "invalid";
+ }
+}
+
+/**
+ * This can contain two MIs. The size checking is a bit of a mess.
+ */
+static int gsm48_rx_paging_p1(struct msgb *msg, struct osmocom_ms *ms)
+{
+ struct gsm48_paging1 *pag;
+ int len1, len2, mi_type, tag;
+ char mi_string[GSM48_MI_SIZE];
+
+ /* is there enough room for the header + LV? */
+ if (msgb_l3len(msg) < sizeof(*pag) + 2) {
+ LOGP(DRR, LOGL_ERROR, "PagingRequest is too short.\n");
+ return -1;
+ }
+
+ pag = msgb_l3(msg);
+ len1 = pag->data[0];
+ mi_type = pag->data[1] & GSM_MI_TYPE_MASK;
+
+ if (msgb_l3len(msg) < sizeof(*pag) + 2 + len1) {
+ LOGP(DRR, LOGL_ERROR, "PagingRequest with wrong MI\n");
+ return -1;
+ }
+
+ if (mi_type != GSM_MI_TYPE_NONE) {
+ gsm48_mi_to_string(mi_string, sizeof(mi_string), &pag->data[1], len1);
+ LOGP(DRR, LOGL_NOTICE, "Paging1: %s chan %s to %s M(%s) \n",
+ pag_print_mode(pag->pag_mode),
+ chan_need(pag->cneed1),
+ mi_type_to_string(mi_type),
+ mi_string);
+ }
+
+ /* check if we have a MI type in here */
+ if (msgb_l3len(msg) < sizeof(*pag) + 2 + len1 + 3)
+ return 0;
+
+ tag = pag->data[2 + len1 + 0];
+ len2 = pag->data[2 + len1 + 1];
+ mi_type = pag->data[2 + len1 + 2] & GSM_MI_TYPE_MASK;
+ if (tag == GSM48_IE_MOBILE_ID && mi_type != GSM_MI_TYPE_NONE) {
+ if (msgb_l3len(msg) < sizeof(*pag) + 2 + len1 + 3 + len2) {
+ LOGP(DRR, LOGL_ERROR, "Optional MI does not fit here.\n");
+ return -1;
+ }
+
+ gsm48_mi_to_string(mi_string, sizeof(mi_string), &pag->data[2 + len1 + 2], len2);
+ LOGP(DRR, LOGL_NOTICE, "Paging2: %s chan %s to %s M(%s) \n",
+ pag_print_mode(pag->pag_mode),
+ chan_need(pag->cneed2),
+ mi_type_to_string(mi_type),
+ mi_string);
+ }
+ return 0;
+}
+
+static int gsm48_rx_paging_p2(struct msgb *msg, struct osmocom_ms *ms)
+{
+ struct gsm48_paging2 *pag;
+ int tag, len, mi_type;
+ char mi_string[GSM48_MI_SIZE];
+
+ if (msgb_l3len(msg) < sizeof(*pag)) {
+ LOGP(DRR, LOGL_ERROR, "Paging2 message is too small.\n");
+ return -1;
+ }
+
+ pag = msgb_l3(msg);
+ LOGP(DRR, LOGL_NOTICE, "Paging1: %s chan %s to TMSI M(0x%x) \n",
+ pag_print_mode(pag->pag_mode),
+ chan_need(pag->cneed1), pag->tmsi1);
+ LOGP(DRR, LOGL_NOTICE, "Paging2: %s chan %s to TMSI M(0x%x) \n",
+ pag_print_mode(pag->pag_mode),
+ chan_need(pag->cneed1), pag->tmsi2);
+
+ /* no optional element */
+ if (msgb_l3len(msg) < sizeof(*pag) + 3)
+ return 0;
+
+ tag = pag->data[0];
+ len = pag->data[1];
+ mi_type = pag->data[2] & GSM_MI_TYPE_MASK;
+
+ if (tag != GSM48_IE_MOBILE_ID)
+ return 0;
+
+ if (msgb_l3len(msg) < sizeof(*pag) + 3 + len) {
+ LOGP(DRR, LOGL_ERROR, "Optional MI does not fit in here\n");
+ return -1;
+ }
+
+ gsm48_mi_to_string(mi_string, sizeof(mi_string), &pag->data[2], len);
+ LOGP(DRR, LOGL_NOTICE, "Paging3: %s chan %s to %s M(%s) \n",
+ pag_print_mode(pag->pag_mode),
+ "n/a ",
+ mi_type_to_string(mi_type),
+ mi_string);
+
+ return 0;
+}
+
+int gsm48_rx_ccch(struct msgb *msg, struct osmocom_ms *ms)
+{
+ struct gsm48_system_information_type_header *sih = msgb_l3(msg);
+ int rc = 0;
+
+ if (sih->rr_protocol_discriminator != GSM48_PDISC_RR)
+ LOGP(DRR, LOGL_ERROR, "PCH pdisc != RR\n");
+
+ switch (sih->system_information) {
+ case GSM48_MT_RR_PAG_REQ_1:
+ gsm48_rx_paging_p1(msg, ms);
+ break;
+ case GSM48_MT_RR_PAG_REQ_2:
+ gsm48_rx_paging_p2(msg, ms);
+ break;
+ case GSM48_MT_RR_PAG_REQ_3:
+ LOGP(DRR, LOGL_ERROR, "PAGING of type 3 is not implemented.\n");
+ break;
+ case GSM48_MT_RR_IMM_ASS:
+ gsm48_rx_imm_ass(msg, ms);
+ break;
+ case GSM48_MT_RR_NOTIF_NCH:
+ /* notification for voice call groups and such */
+ break;
+ case 0x07:
+ /* wireshark know that this is SI2 quater and for 3G interop */
+ break;
+ default:
+ LOGP(DRR, LOGL_NOTICE, "unknown PCH/AGCH type 0x%02x\n",
+ sih->system_information);
+ rc = -EINVAL;
+ }
+
+ return rc;
+}
+
+int gsm48_rx_bcch(struct msgb *msg, struct osmocom_ms *ms)
+{
+ /* FIXME: we have lost the gsm frame time until here, need to store it
+ * in some msgb context */
+ //dump_bcch(dl->time.tc, ccch->data);
+ dump_bcch(ms, 0, msg->l3h);
+
+ /* Req channel logic */
+ if (app_state.ccch_enabled && (app_state.rach_count < 2)) {
+ l1ctl_tx_rach_req(ms, app_state.rach_count, 0,
+ app_state.ccch_mode == CCCH_MODE_COMBINED);
+ app_state.rach_count++;
+ }
+
+ return 0;
+}
+
+void layer3_app_reset(void)
+{
+ /* Reset state */
+ app_state.has_si1 = 0;
+ app_state.ccch_mode = CCCH_MODE_NONE;
+ app_state.ccch_enabled = 0;
+ app_state.rach_count = 0;
+
+ memset(&app_state.cell_arfcns, 0x00, sizeof(app_state.cell_arfcns));
+}
+
+static int signal_cb(unsigned int subsys, unsigned int signal,
+ void *handler_data, void *signal_data)
+{
+ struct osmocom_ms *ms;
+
+ if (subsys != SS_L1CTL)
+ return 0;
+
+ switch (signal) {
+ case S_L1CTL_RESET:
+ ms = signal_data;
+ layer3_app_reset();
+ return l1ctl_tx_fbsb_req(ms, ms->test_arfcn,
+ L1CTL_FBSB_F_FB01SB, 100, 0,
+ CCCH_MODE_NONE);
+ break;
+ }
+ return 0;
+}
+
+
+int l23_app_init(struct osmocom_ms *ms)
+{
+ register_signal_handler(SS_L1CTL, &signal_cb, NULL);
+ l1ctl_tx_reset_req(ms, L1CTL_RES_T_FULL);
+ return layer3_init(ms);
+}
+
+static struct l23_app_info info = {
+ .copyright = "Copyright (C) 2010 Harald Welte <laforge@gnumonks.org>\n",
+ .contribution = "Contributions by Holger Hans Peter Freyther\n",
+};
+
+struct l23_app_info *l23_app_info()
+{
+ return &info;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-29 07:30:28 +0000