AM_CFLAGS = -Wall $(LIBOSMOCORE_CFLAGS)
LDADD = ../common/liblayer23.a $(LIBOSMOCORE_LIBS)
-bin_PROGRAMS = bcch_scan layer23 echo_test cell_log cbch_sniff
+bin_PROGRAMS = bcch_scan ccch_scan echo_test cell_log cbch_sniff
bcch_scan_SOURCES = ../common/main.c app_bcch_scan.c bcch_scan.c
-layer23_SOURCES = ../common/main.c app_phone.c layer3.c rslms.c
+ccch_scan_SOURCES = ../common/main.c app_phone.c app_ccch_scan.c rslms.c
echo_test_SOURCES = ../common/main.c app_echo_test.c
cell_log_LDADD = $(LDADD) -lm
cell_log_SOURCES = ../common/main.c app_cell_log.c cell_log.c \
--- /dev/null
+#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/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>
+
+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 §6.3.1.3 Mapping of BCCH data */
+ switch (si_hdr->system_information) {
+ case GSM48_MT_RR_SYSINFO_1:
+ fprintf(stderr, "\tSI1");
+#ifdef BCCH_TC_CHECK
+ if (tc != 0)
+ fprintf(stderr, " on wrong 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;
+ }
+ break;
+ case GSM48_MT_RR_SYSINFO_2:
+ fprintf(stderr, "\tSI2");
+#ifdef BCCH_TC_CHECK
+ if (tc != 1)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_3:
+ fprintf(stderr, "\tSI3");
+#ifdef BCCH_TC_CHECK
+ if (tc != 2 && tc != 6)
+ fprintf(stderr, " on wrong 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:
+ fprintf(stderr, "\tSI4");
+#ifdef BCCH_TC_CHECK
+ if (tc != 3 && tc != 7)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_5:
+ fprintf(stderr, "\tSI5");
+ break;
+ case GSM48_MT_RR_SYSINFO_6:
+ fprintf(stderr, "\tSI6");
+ break;
+ case GSM48_MT_RR_SYSINFO_7:
+ fprintf(stderr, "\tSI7");
+#ifdef BCCH_TC_CHECK
+ if (tc != 7)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_8:
+ fprintf(stderr, "\tSI8");
+#ifdef BCCH_TC_CHECK
+ if (tc != 3)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_9:
+ fprintf(stderr, "\tSI9");
+#ifdef BCCH_TC_CHECK
+ if (tc != 4)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_13:
+ fprintf(stderr, "\tSI13");
+#ifdef BCCH_TC_CHECK
+ if (tc != 4 && tc != 0)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_16:
+ fprintf(stderr, "\tSI16");
+#ifdef BCCH_TC_CHECK
+ if (tc != 6)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_17:
+ fprintf(stderr, "\tSI17");
+#ifdef BCCH_TC_CHECK
+ if (tc != 2)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_2bis:
+ fprintf(stderr, "\tSI2bis");
+#ifdef BCCH_TC_CHECK
+ if (tc != 5)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_2ter:
+ fprintf(stderr, "\tSI2ter");
+#ifdef BCCH_TC_CHECK
+ if (tc != 5 && tc != 4)
+ fprintf(stderr, " on wrong TC");
+#endif
+ break;
+ case GSM48_MT_RR_SYSINFO_5bis:
+ fprintf(stderr, "\tSI5bis");
+ break;
+ case GSM48_MT_RR_SYSINFO_5ter:
+ fprintf(stderr, "\tSI5ter");
+ break;
+ default:
+ fprintf(stderr, "\tUnknown SI");
+ break;
+ };
+
+ fprintf(stderr, "\n");
+}
+
+
+/* send location updating request * (as part of RSLms EST IND /
+ LAPDm SABME) */
+static int gsm48_tx_loc_upd_req(struct osmocom_ms *ms, uint8_t chan_nr)
+{
+ struct msgb *msg = msgb_alloc_headroom(256, 16, "loc_upd_req");
+ struct gsm48_hdr *gh;
+ struct gsm48_loc_upd_req *lu_r;
+
+ DEBUGP(DMM, "chan_nr=%u\n", chan_nr);
+
+ msg->l3h = msgb_put(msg, sizeof(*gh));
+ gh = (struct gsm48_hdr *) msg->l3h;
+ gh->proto_discr = GSM48_PDISC_MM;
+ gh->msg_type = GSM48_MT_MM_LOC_UPD_REQUEST;
+ lu_r = (struct gsm48_loc_upd_req *) msgb_put(msg, sizeof(*lu_r));
+ lu_r->type = GSM48_LUPD_IMSI_ATT;
+ lu_r->key_seq = 0;
+ /* FIXME: set LAI and CM1 */
+ /* FIXME: set MI */
+ lu_r->mi_len = 0;
+
+ return rslms_tx_rll_req_l3(ms, RSL_MT_EST_REQ, chan_nr, 0, msg);
+}
+
+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;
+ int rv;
+
+ /* 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);
+
+ DEBUGP(DRR, "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);
+
+ /* request L1 to go to dedicated mode on assigned channel */
+ rv = l1ctl_tx_dm_est_req_h0(ms,
+ arfcn, ia->chan_desc.chan_nr, ia->chan_desc.h0.tsc,
+ GSM48_CMODE_SIGN);
+ } 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);
+
+ DEBUGP(DRR, "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++;
+ }
+ }
+
+ /* request L1 to go to dedicated mode on assigned channel */
+ rv = l1ctl_tx_dm_est_req_h1(ms,
+ maio, hsn, ma, ma_len,
+ ia->chan_desc.chan_nr, ia->chan_desc.h1.tsc,
+ GSM48_CMODE_SIGN);
+ }
+
+ DEBUGPC(DRR, "\n");
+
+ rv = gsm48_tx_loc_upd_req(ms, ia->chan_desc.chan_nr);
+
+ return rv;
+}
+
+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:
+ case GSM48_MT_RR_PAG_REQ_2:
+ case GSM48_MT_RR_PAG_REQ_3:
+ /* FIXME: implement decoding of paging request */
+ break;
+ case GSM48_MT_RR_IMM_ASS:
+ rc = gsm48_rx_imm_ass(msg, ms);
+ 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));
+}
+++ /dev/null
-#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/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>
-
-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 §6.3.1.3 Mapping of BCCH data */
- switch (si_hdr->system_information) {
- case GSM48_MT_RR_SYSINFO_1:
- fprintf(stderr, "\tSI1");
-#ifdef BCCH_TC_CHECK
- if (tc != 0)
- fprintf(stderr, " on wrong 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;
- }
- break;
- case GSM48_MT_RR_SYSINFO_2:
- fprintf(stderr, "\tSI2");
-#ifdef BCCH_TC_CHECK
- if (tc != 1)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_3:
- fprintf(stderr, "\tSI3");
-#ifdef BCCH_TC_CHECK
- if (tc != 2 && tc != 6)
- fprintf(stderr, " on wrong 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:
- fprintf(stderr, "\tSI4");
-#ifdef BCCH_TC_CHECK
- if (tc != 3 && tc != 7)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_5:
- fprintf(stderr, "\tSI5");
- break;
- case GSM48_MT_RR_SYSINFO_6:
- fprintf(stderr, "\tSI6");
- break;
- case GSM48_MT_RR_SYSINFO_7:
- fprintf(stderr, "\tSI7");
-#ifdef BCCH_TC_CHECK
- if (tc != 7)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_8:
- fprintf(stderr, "\tSI8");
-#ifdef BCCH_TC_CHECK
- if (tc != 3)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_9:
- fprintf(stderr, "\tSI9");
-#ifdef BCCH_TC_CHECK
- if (tc != 4)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_13:
- fprintf(stderr, "\tSI13");
-#ifdef BCCH_TC_CHECK
- if (tc != 4 && tc != 0)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_16:
- fprintf(stderr, "\tSI16");
-#ifdef BCCH_TC_CHECK
- if (tc != 6)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_17:
- fprintf(stderr, "\tSI17");
-#ifdef BCCH_TC_CHECK
- if (tc != 2)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_2bis:
- fprintf(stderr, "\tSI2bis");
-#ifdef BCCH_TC_CHECK
- if (tc != 5)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_2ter:
- fprintf(stderr, "\tSI2ter");
-#ifdef BCCH_TC_CHECK
- if (tc != 5 && tc != 4)
- fprintf(stderr, " on wrong TC");
-#endif
- break;
- case GSM48_MT_RR_SYSINFO_5bis:
- fprintf(stderr, "\tSI5bis");
- break;
- case GSM48_MT_RR_SYSINFO_5ter:
- fprintf(stderr, "\tSI5ter");
- break;
- default:
- fprintf(stderr, "\tUnknown SI");
- break;
- };
-
- fprintf(stderr, "\n");
-}
-
-
-/* send location updating request * (as part of RSLms EST IND /
- LAPDm SABME) */
-static int gsm48_tx_loc_upd_req(struct osmocom_ms *ms, uint8_t chan_nr)
-{
- struct msgb *msg = msgb_alloc_headroom(256, 16, "loc_upd_req");
- struct gsm48_hdr *gh;
- struct gsm48_loc_upd_req *lu_r;
-
- DEBUGP(DMM, "chan_nr=%u\n", chan_nr);
-
- msg->l3h = msgb_put(msg, sizeof(*gh));
- gh = (struct gsm48_hdr *) msg->l3h;
- gh->proto_discr = GSM48_PDISC_MM;
- gh->msg_type = GSM48_MT_MM_LOC_UPD_REQUEST;
- lu_r = (struct gsm48_loc_upd_req *) msgb_put(msg, sizeof(*lu_r));
- lu_r->type = GSM48_LUPD_IMSI_ATT;
- lu_r->key_seq = 0;
- /* FIXME: set LAI and CM1 */
- /* FIXME: set MI */
- lu_r->mi_len = 0;
-
- return rslms_tx_rll_req_l3(ms, RSL_MT_EST_REQ, chan_nr, 0, msg);
-}
-
-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;
- int rv;
-
- /* 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);
-
- DEBUGP(DRR, "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);
-
- /* request L1 to go to dedicated mode on assigned channel */
- rv = l1ctl_tx_dm_est_req_h0(ms,
- arfcn, ia->chan_desc.chan_nr, ia->chan_desc.h0.tsc,
- GSM48_CMODE_SIGN);
- } 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);
-
- DEBUGP(DRR, "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++;
- }
- }
-
- /* request L1 to go to dedicated mode on assigned channel */
- rv = l1ctl_tx_dm_est_req_h1(ms,
- maio, hsn, ma, ma_len,
- ia->chan_desc.chan_nr, ia->chan_desc.h1.tsc,
- GSM48_CMODE_SIGN);
- }
-
- DEBUGPC(DRR, "\n");
-
- rv = gsm48_tx_loc_upd_req(ms, ia->chan_desc.chan_nr);
-
- return rv;
-}
-
-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:
- case GSM48_MT_RR_PAG_REQ_2:
- case GSM48_MT_RR_PAG_REQ_3:
- /* FIXME: implement decoding of paging request */
- break;
- case GSM48_MT_RR_IMM_ASS:
- rc = gsm48_rx_imm_ass(msg, ms);
- 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));
-}
-
projects / osmocom-bb.git / commitdiff