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authorHarald Welte <laforge@osmocom.org>2020-12-18 17:13:35 +0100
committerHarald Welte <laforge@osmocom.org>2021-01-05 23:46:05 +0100
commit1e30f0dab7f1afb61666030aab75206aa71ded65 (patch)
treeea06bf33a50bf985f9d8e1453387558690bbbd69
parent31ac0bea552f4999d9b7268a8f7afde573637f6c (diff)
Add new "osmo-e1gen" program.HEADmaster
osmo-e1gen is a program that re-uses large parts of osmo-e1d, but whose main purpose is to generate a variety of error conditions in order to test a remote E1 implementation. Instead of using the automatisms of the icE1usb transmit IP core, it switches it to transparent mode and uses a host-software based E1 framer "osmo_e1f", over which we have more control than the firmware. Change-Id: I53a86d6730eb76a9cff9eb3f4786139015c91230
-rw-r--r--src/Makefile.am20
-rw-r--r--src/e1d.h2
-rw-r--r--src/e1gen/crc4itu.c56
-rw-r--r--src/e1gen/crc4itu.h106
-rw-r--r--src/e1gen/osmo_e1f.c704
-rw-r--r--src/e1gen/osmo_e1f.h123
-rw-r--r--src/osmo-e1gen.c438
7 files changed, 1449 insertions, 0 deletions
diff --git a/src/Makefile.am b/src/Makefile.am
index fd61f5a..d245bc6 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -24,6 +24,8 @@ noinst_HEADERS = \
ice1usb_proto.h \
log.h \
usb.h \
+ e1gen/crc4itu.h \
+ e1gen/osmo_e1f.h \
$(NULL)
@@ -32,6 +34,10 @@ bin_PROGRAMS = \
osmo-e1d-pipe \
$(NULL)
+noinst_PROGRAMS = \
+ osmo-e1gen \
+ $(NULL)
+
osmo_e1d_SOURCES = \
ctl.c \
intf_line.c \
@@ -51,3 +57,17 @@ osmo_e1d_pipe_SOURCES = \
$(NULL)
osmo_e1d_pipe_LDADD = $(LIBOSMOCORE_LIBS) libosmo-e1d.la
+
+
+osmo_e1gen_LDADD = $(LIBOSMOCORE_LIBS) $(LIBOSMOVTY_LIBS) \
+ $(LIBOSMOUSB_LIBS) $(LIBUSB_LIBS)
+
+osmo_e1gen_SOURCES = \
+ intf_line.c \
+ log.c \
+ e1gen/crc4itu.c \
+ e1gen/osmo_e1f.c \
+ osmo-e1gen.c \
+ usb.c \
+ vty.c \
+ $(NULL)
diff --git a/src/e1d.h b/src/e1d.h
index 7cb5335..70bca38 100644
--- a/src/e1d.h
+++ b/src/e1d.h
@@ -120,6 +120,8 @@ struct e1_line {
/*! timer to re-set the rx_crc4_err and rx_alarm above */
struct osmo_timer_list timer;
} ts0;
+
+ void *e1gen_priv;
};
enum e1_driver {
diff --git a/src/e1gen/crc4itu.c b/src/e1gen/crc4itu.c
new file mode 100644
index 0000000..f13895a
--- /dev/null
+++ b/src/e1gen/crc4itu.c
@@ -0,0 +1,56 @@
+/**
+ * \file
+ * Functions and types for CRC checks.
+ *
+ * Generated on Sat May 12 09:39:22 2018
+ * by pycrc v0.9.1, https://pycrc.org
+ * using the configuration:
+ * - Width = 4
+ * - Poly = 0x3
+ * - XorIn = 0x0
+ * - ReflectIn = False
+ * - XorOut = 0x0
+ * - ReflectOut = False
+ * - Algorithm = table-driven
+ */
+#include "crc4itu.h" /* include the header file generated with pycrc */
+#include <stdlib.h>
+#include <stdint.h>
+
+
+
+/**
+ * Static table used for the table_driven implementation.
+ */
+static const crc_t crc_table[256] = {
+ 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09, 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02,
+ 0x05, 0x06, 0x03, 0x00, 0x09, 0x0a, 0x0f, 0x0c, 0x0e, 0x0d, 0x08, 0x0b, 0x02, 0x01, 0x04, 0x07,
+ 0x0a, 0x09, 0x0c, 0x0f, 0x06, 0x05, 0x00, 0x03, 0x01, 0x02, 0x07, 0x04, 0x0d, 0x0e, 0x0b, 0x08,
+ 0x0f, 0x0c, 0x09, 0x0a, 0x03, 0x00, 0x05, 0x06, 0x04, 0x07, 0x02, 0x01, 0x08, 0x0b, 0x0e, 0x0d,
+ 0x07, 0x04, 0x01, 0x02, 0x0b, 0x08, 0x0d, 0x0e, 0x0c, 0x0f, 0x0a, 0x09, 0x00, 0x03, 0x06, 0x05,
+ 0x02, 0x01, 0x04, 0x07, 0x0e, 0x0d, 0x08, 0x0b, 0x09, 0x0a, 0x0f, 0x0c, 0x05, 0x06, 0x03, 0x00,
+ 0x0d, 0x0e, 0x0b, 0x08, 0x01, 0x02, 0x07, 0x04, 0x06, 0x05, 0x00, 0x03, 0x0a, 0x09, 0x0c, 0x0f,
+ 0x08, 0x0b, 0x0e, 0x0d, 0x04, 0x07, 0x02, 0x01, 0x03, 0x00, 0x05, 0x06, 0x0f, 0x0c, 0x09, 0x0a,
+ 0x0e, 0x0d, 0x08, 0x0b, 0x02, 0x01, 0x04, 0x07, 0x05, 0x06, 0x03, 0x00, 0x09, 0x0a, 0x0f, 0x0c,
+ 0x0b, 0x08, 0x0d, 0x0e, 0x07, 0x04, 0x01, 0x02, 0x00, 0x03, 0x06, 0x05, 0x0c, 0x0f, 0x0a, 0x09,
+ 0x04, 0x07, 0x02, 0x01, 0x08, 0x0b, 0x0e, 0x0d, 0x0f, 0x0c, 0x09, 0x0a, 0x03, 0x00, 0x05, 0x06,
+ 0x01, 0x02, 0x07, 0x04, 0x0d, 0x0e, 0x0b, 0x08, 0x0a, 0x09, 0x0c, 0x0f, 0x06, 0x05, 0x00, 0x03,
+ 0x09, 0x0a, 0x0f, 0x0c, 0x05, 0x06, 0x03, 0x00, 0x02, 0x01, 0x04, 0x07, 0x0e, 0x0d, 0x08, 0x0b,
+ 0x0c, 0x0f, 0x0a, 0x09, 0x00, 0x03, 0x06, 0x05, 0x07, 0x04, 0x01, 0x02, 0x0b, 0x08, 0x0d, 0x0e,
+ 0x03, 0x00, 0x05, 0x06, 0x0f, 0x0c, 0x09, 0x0a, 0x08, 0x0b, 0x0e, 0x0d, 0x04, 0x07, 0x02, 0x01,
+ 0x06, 0x05, 0x00, 0x03, 0x0a, 0x09, 0x0c, 0x0f, 0x0d, 0x0e, 0x0b, 0x08, 0x01, 0x02, 0x07, 0x04
+};
+
+
+crc_t crc4itu_update(crc_t crc, const void *data, size_t data_len)
+{
+ const unsigned char *d = (const unsigned char *)data;
+ unsigned int tbl_idx;
+
+ while (data_len--) {
+ tbl_idx = (crc << 4) ^ *d;
+ crc = crc_table[tbl_idx] & 0xf;
+ d++;
+ }
+ return crc & 0xf;
+}
diff --git a/src/e1gen/crc4itu.h b/src/e1gen/crc4itu.h
new file mode 100644
index 0000000..220b50f
--- /dev/null
+++ b/src/e1gen/crc4itu.h
@@ -0,0 +1,106 @@
+/**
+ * \file
+ * Functions and types for CRC checks.
+ *
+ * Generated on Sat May 12 09:41:12 2018
+ * by pycrc v0.9.1, https://pycrc.org
+ * using the configuration:
+ * - Width = 4
+ * - Poly = 0x3
+ * - XorIn = 0x0
+ * - ReflectIn = False
+ * - XorOut = 0x0
+ * - ReflectOut = False
+ * - Algorithm = table-driven
+ *
+ * This file defines the functions crc4itu_init(), crc4itu_update() and crc_finalize().
+ *
+ * The crc4itu_init() function returns the inital \c crc value and must be called
+ * before the first call to crc4itu_update().
+ * Similarly, the crc_finalize() function must be called after the last call
+ * to crc4itu_update(), before the \c crc is being used.
+ * is being used.
+ *
+ * The crc4itu_update() function can be called any number of times (including zero
+ * times) in between the crc4itu_init() and crc_finalize() calls.
+ *
+ * This pseudo-code shows an example usage of the API:
+ * \code{.c}
+ * crc_t crc;
+ * unsigned char data[MAX_DATA_LEN];
+ * size_t data_len;
+ *
+ * crc = crc4itu_init();
+ * while ((data_len = read_data(data, MAX_DATA_LEN)) > 0) {
+ * crc = crc4itu_update(crc, data, data_len);
+ * }
+ * crc = crc_finalize(crc);
+ * \endcode
+ */
+#ifndef CRC4ITU_H
+#define CRC4ITU_H
+
+#include <stdlib.h>
+#include <stdint.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/**
+ * The definition of the used algorithm.
+ *
+ * This is not used anywhere in the generated code, but it may be used by the
+ * application code to call algorithm-specific code, if desired.
+ */
+#define CRC_ALGO_TABLE_DRIVEN 1
+
+
+/**
+ * The type of the CRC values.
+ *
+ * This type must be big enough to contain at least 4 bits.
+ */
+typedef uint_fast8_t crc_t;
+
+
+/**
+ * Calculate the initial crc value.
+ *
+ * \return The initial crc value.
+ */
+static inline crc_t crc4itu_init(void)
+{
+ return 0x0;
+}
+
+
+/**
+ * Update the crc value with new data.
+ *
+ * \param[in] crc The current crc value.
+ * \param[in] data Pointer to a buffer of \a data_len bytes.
+ * \param[in] data_len Number of bytes in the \a data buffer.
+ * \return The updated crc value.
+ */
+crc_t crc4itu_update(crc_t crc, const void *data, size_t data_len);
+
+
+/**
+ * Calculate the final crc value.
+ *
+ * \param[in] crc The current crc value.
+ * \return The final crc value.
+ */
+static inline crc_t crc_finalize(crc_t crc)
+{
+ return crc;
+}
+
+
+#ifdef __cplusplus
+} /* closing brace for extern "C" */
+#endif
+
+#endif /* CRC4ITU_H */
diff --git a/src/e1gen/osmo_e1f.c b/src/e1gen/osmo_e1f.c
new file mode 100644
index 0000000..fa64e17
--- /dev/null
+++ b/src/e1gen/osmo_e1f.c
@@ -0,0 +1,704 @@
+/* Osmocom Software Defined E1
+ *
+ * (C) 2018 by Harald Welte <laforge@gnumonks.org>
+ *
+ * Implements ITU-T Rec. G.704 Section 2.3
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/logging.h>
+#include <osmocom/core/fsm.h>
+
+#include "crc4itu.h"
+#include "osmo_e1f.h"
+
+#define S(x) (1 << (x))
+
+/* Frame Alignment Signal (BIT1 may be overwritten with CRC-4) */
+#define G704_E1_FAS 0x1B
+
+static inline bool is_correct_fas(uint8_t bt) {
+ if ((bt & 0x7F) == G704_E1_FAS)
+ return true;
+ else
+ return false;
+}
+
+/* are we in SMF II (true) or I (false) */
+static inline bool is_smf_II(const struct osmo_e1f_tx_state *tx) {
+ if (tx->frame_nr >= 8)
+ return true;
+ return false;
+}
+
+static struct osmo_fsm e1_align_fsm;
+static void align_fsm_reset(struct osmo_e1f_instance *e1i);
+
+static void notify_user(struct osmo_e1f_instance *e1i, enum osmo_e1f_notify_event evt,
+ bool present, void *priv)
+{
+ if (!e1i->notify_cb)
+ return;
+ e1i->notify_cb(e1i, evt, present, priv);
+}
+
+/*! Initialize a (caller-allocated) Osmocom E1 Instance
+ * \param[inout] e1i E1 Instance to be initialized
+ * \returns 0 on success, negative on error */
+int osmo_e1f_instance_init(struct osmo_e1f_instance *e1i, const char *name, e1_notify_cb cb,
+ bool crc4_enabled, void *priv)
+{
+ int i;
+
+ e1i->crc4_enabled = crc4_enabled;
+ e1i->notify_cb = cb;
+ e1i->tx.sa4_sa8 = 0x1f;
+
+ e1i->priv = priv;
+
+ for (i = 1; i < ARRAY_SIZE(e1i->ts); i++) {
+ struct osmo_e1f_instance_ts *e1t = &e1i->ts[i];
+ e1t->ts_nr = i;
+ e1t->inst = e1i;
+ INIT_LLIST_HEAD(&e1t->tx.queue);
+
+ e1t->rx.granularity = 256;
+ }
+
+ e1i->rx.fi = osmo_fsm_inst_alloc(&e1_align_fsm, NULL, e1i, LOGL_DEBUG, name);
+ if (!e1i->rx.fi)
+ return -1;
+
+ osmo_e1f_instance_reset(e1i);
+
+ return 0;
+}
+
+/*! stop E1 timeslot; release any pending rx/tx buffers
+ * \param[in] e1t Timeslot which we are to stop, disable and release buffers */
+void osmo_e1f_ts_reset(struct osmo_e1f_instance_ts *e1t)
+{
+ e1t->tx.underruns = 0;
+ msgb_queue_free(&e1t->tx.queue);
+
+ e1t->rx.enabled = false;
+ msgb_free(e1t->rx.msg);
+ e1t->rx.msg = NULL;
+
+ osmo_isdnhdlc_rcv_init(&e1t->rx.hdlc, OSMO_HDLC_F_BITREVERSE);
+ //osmo_isdnhdlc_rcv_init(&e1t->rx.hdlc, 0);
+ osmo_isdnhdlc_out_init(&e1t->tx.hdlc, 0);
+}
+
+/*! stop E1 instance; stops all timeslots and releases any pending rx/tx buffers
+ * \param[in] e1t E1 instance which we are to stop */
+void osmo_e1f_instance_reset(struct osmo_e1f_instance *e1i)
+{
+ int i;
+
+ align_fsm_reset(e1i);
+
+ e1i->tx.remote_alarm = false;
+ e1i->tx.crc4_error = false;
+ e1i->tx.frame_nr = 0;
+ e1i->tx.crc4_last_smf = 0;
+ e1i->tx.crc4 = crc4itu_init();
+
+ e1i->rx.frame_nr = 0;
+ memset(&e1i->rx.ts0_history, 0, sizeof(e1i->rx.ts0_history));
+ e1i->rx.ts0_hist_len = 0;
+ e1i->rx.remote_alarm = false;
+ e1i->rx.remote_crc4_error = false;
+ e1i->rx.num_ts0_in_mframe_search = 0;
+
+ for (i = 1; i < ARRAY_SIZE(e1i->ts); i++) {
+ struct osmo_e1f_instance_ts *e1t = &e1i->ts[i];
+ osmo_e1f_ts_reset(e1t);
+ }
+}
+
+/*! obtain pointer to TS given by instance + timeslot number
+ * \param[in] e1i E1 intance on which we work
+ * \param[in] ts_nr E1 timeslot number (1..31)
+ * \returns pointer to timeslot; NULL on error */
+struct osmo_e1f_instance_ts *osmo_e1f_instance_ts(struct osmo_e1f_instance *e1i, uint8_t ts_nr)
+{
+ if (ts_nr == 0 || ts_nr >= ARRAY_SIZE(e1i->ts))
+ return NULL;
+
+ return &e1i->ts[ts_nr];
+}
+
+/*! configure an E1 timeslot
+ * \param[in] e1t Timeslot which we are to configure
+ * \param[in] granularity granularity (buffer size) to use on Rx
+ * \param[in] enable enable (true) or disalble (false) receiving on this TS
+ * \param[in] mode the mode for this timeslot (raw or hdlc)
+ * \return 0 on success; negative on error */
+int osmo_e1f_ts_config(struct osmo_e1f_instance_ts *e1t, e1_data_cb cb, unsigned int granularity,
+ bool enable, enum osmo_e1f_ts_mode mode)
+{
+ e1t->rx.data_cb = cb;
+ e1t->rx.enabled = enable;
+ e1t->rx.granularity = granularity;
+ e1t->mode = mode;
+
+ return 0;
+}
+
+const struct value_string osmo_e1f_notifv_evt_names[] = {
+ { E1_NTFY_EVT_ALIGN_FRAME, "Aligned to Frame" },
+ { E1_NTFY_EVT_ALIGN_CRC_MFRAME, "Aligned to CRC4-Multiframe" },
+ { E1_NTFY_EVT_CRC_ERROR, "CRC Error detected (local)" },
+ { E1_NTFY_EVT_REMOTE_CRC_ERROR, "CRC Error reported (remote)" },
+ { E1_NTFY_EVT_REMOTE_ALARM, "Remote Alarm condition repoorted" },
+ { 0, NULL }
+};
+
+/***********************************************************************
+ * Transmit Side
+ ***********************************************************************/
+
+/*! Enqueue a message buffer of to-be-transmitted data for a timeslot
+ * \param[in] e1i E1 instance for which to enqueue
+ * \param[in] ts_nr Timeslot number on which data is to be transmitted
+ * \param[in] msg Message buffer storing the to-be-transmitted data
+ * \returns 0 on success; negative in case of error.
+ *
+ * Ownership of \a msg is transferred from caller into this function, but only
+ * in case of successful execution (return 0)!
+ */
+void osmo_e1f_ts_enqueue(struct osmo_e1f_instance_ts *e1t, struct msgb *msg)
+{
+ msgb_enqueue(&e1t->tx.queue, msg);
+}
+
+/* obtain a CRC4 bit for the current frame number */
+static uint8_t e1_pull_crc4_bit(struct osmo_e1f_instance *e1i)
+{
+ /* If CRC-4 is disabled, all CRC bits shall be '1' */
+ if (e1i->crc4_enabled == 0) {
+ return 0x01;
+ } else {
+ /* CRC is transmitted MSB first */
+ switch (e1i->tx.frame_nr % 8) {
+ case 0:
+ return (e1i->tx.crc4_last_smf >> 3) & 1;
+ case 2:
+ return (e1i->tx.crc4_last_smf >> 2) & 1;
+ case 4:
+ return (e1i->tx.crc4_last_smf >> 1) & 1;
+ case 6:
+ return (e1i->tx.crc4_last_smf >> 0) & 1;
+ default:
+ OSMO_ASSERT(0);
+ }
+ }
+}
+
+/* pull a single to-be-transmitted byte for TS0 */
+static uint8_t e1_pull_ts0(struct osmo_e1f_instance *e1i)
+{
+ uint8_t ret = 0;
+
+ /* re-set CRC4 at start of sub-multiframe */
+ if (e1i->tx.frame_nr == 0 || e1i->tx.frame_nr == 8) {
+ e1i->tx.crc4_last_smf = e1i->tx.crc4;
+ e1i->tx.crc4 = 0;
+ }
+
+ /* according to Table 5B/G.704 - CRC-4 multiframe structure */
+ if ((e1i->tx.frame_nr % 2) == 0) {
+ /* FAS */
+ ret = G704_E1_FAS | (e1_pull_crc4_bit(e1i) << 7);
+ } else {
+ switch (e1i->tx.frame_nr) {
+ case 1:
+ case 3:
+ case 7:
+ ret = 0x40;
+ break;
+ case 5:
+ case 9:
+ case 11:
+ ret = 0xC0;
+ break;
+ case 13:
+ case 15:
+ ret = 0x40;
+ if (!e1i->tx.crc4_error)
+ ret |= 0x80;
+ break;
+ }
+ ret |= e1i->tx.sa4_sa8;
+ if (e1i->tx.remote_alarm)
+ ret |= 0x20;
+ }
+
+ /* increment frame number modulo 16 */
+ e1i->tx.frame_nr = (e1i->tx.frame_nr + 1) % 16;
+
+ return ret;
+}
+
+/* pull a single to-be-transmitted byte for TS1..31 */
+static uint8_t e1_pull_tsN(struct osmo_e1f_instance_ts *e1t)
+{
+ struct msgb *msg = llist_first_entry_or_null(&e1t->tx.queue, struct msgb, list);
+ uint8_t *cur;
+
+retry:
+ /* if there's no message to transmit */
+ if (!msg) {
+ e1t->tx.underruns++;
+ return 0xFF;
+ }
+ if (msgb_length(msg) <= 0) {
+ llist_del(&msg->list);
+ msgb_free(msg);
+ msg = llist_first_entry_or_null(&e1t->tx.queue, struct msgb, list);
+ goto retry;
+ }
+ cur = msgb_pull(msg, 1);
+ return *cur;
+}
+
+/* update the current in-progress CRC4 value with data from \a out_frame */
+static void e1_tx_update_crc4(struct osmo_e1f_instance *e1i, const uint8_t *out_frame)
+{
+ uint8_t ts0;
+
+ ts0 = out_frame[0];
+ /* mask off the C bits */
+ if (is_correct_fas(ts0))
+ ts0 &= 0x7F;
+ e1i->tx.crc4 = crc4itu_update(e1i->tx.crc4, &ts0, 1);
+ /* add the remaining bytes/bits */
+ e1i->tx.crc4 = crc4itu_update(e1i->tx.crc4, out_frame+1, ARRAY_SIZE(e1i->ts)-1);
+}
+
+/*! Pull one to-be-transmitted E1 frame (256bits) from the E1 instance
+ * \param e1i E1 instance for which the frame shall be generated
+ * \param[out] out_frame callee-allocated buffer to which function stores 32 bytes
+ * \returns 0 on success, negative on error */
+int osmo_e1f_pull_tx_frame(struct osmo_e1f_instance *e1i, uint8_t *out_frame)
+{
+ int i;
+
+ if (e1i->tx.ais) {
+ memset(out_frame, 0xff, 32);
+ return 0;
+ }
+
+ /* generate TS0 */
+ out_frame[0] = e1_pull_ts0(e1i);
+
+ /* generate TS1..31 */
+ for (i = 1; i < ARRAY_SIZE(e1i->ts); i++) {
+ struct osmo_e1f_instance_ts *e1t = &e1i->ts[i];
+ /* get next to-be-transmitted byte from the TS */
+ out_frame[i] = e1_pull_tsN(e1t);
+ }
+ /* update our CRC4 computation */
+ e1_tx_update_crc4(e1i, out_frame);
+
+ return 0;
+}
+
+/***********************************************************************
+ * Receiver Side
+ ***********************************************************************/
+
+/* According to Figure 2 / ITU-T G.706 */
+enum e1_align_state {
+ /* Frame Alignment Search */
+ E1_AS_SEARCH_FRAME,
+ /* CRC multiframe alignment search */
+ E1_AS_SEARCH_CRC_MFRAME,
+ /* monitoring for incorrect frame alignment and error performance using CRC */
+ E1_AS_ALIGNED_CRC_MFRAME,
+ /* no CRC: just frame alignment loss check */
+ E1_AS_ALIGNED_BASIC,
+};
+
+enum e1_align_event {
+ /* received a TS0 octet */
+ E1_AE_RX_TS0,
+ E1_AE_RESET
+};
+
+static const struct value_string e1_align_evt_names[] = {
+ { E1_AE_RX_TS0, "E1_AE_RX_TS0" },
+ { E1_AE_RESET, "E1_AE_RESET" },
+ { 0, NULL }
+};
+
+/* get a TS0 byte from the history. delta 0 == current, delte 1 == previous, ... */
+static uint8_t get_ts0_hist(struct osmo_e1f_instance *e1i, uint8_t delta)
+{
+ return e1i->rx.ts0_history[((e1i->rx.frame_nr + 16)-delta) % 16];
+}
+
+/* ITU-T G.706 Section 4.1.1 */
+static bool frame_alignment_lost(struct osmo_e1f_instance *e1i)
+{
+ if (e1i->rx.frame_nr % 2)
+ return false;
+
+ /* Frame alignment will be assumed to have been lost when three consecutive incorrect
+ * frame alignment signals have been received. */
+ if (!is_correct_fas(get_ts0_hist(e1i, 0)) &&
+ !is_correct_fas(get_ts0_hist(e1i, 2)) &&
+ !is_correct_fas(get_ts0_hist(e1i, 4)))
+ return true;
+ else
+ return false;
+}
+
+/* ITU-T G.706 Section 4.1.2 */
+static bool frame_alignment_recovered(struct osmo_e1f_instance *e1i)
+{
+ /* two consecutive FAS with one non-FAS interspersed */
+ if (is_correct_fas(get_ts0_hist(e1i, 0)) &&
+ !is_correct_fas(get_ts0_hist(e1i, 1)) &&
+ is_correct_fas(get_ts0_hist(e1i, 2)))
+ return true;
+ else
+ return false;
+}
+
+/* ITU-T G.706 Section 4.2 */
+static bool crc_mframe_alignment_achieved(struct osmo_e1f_instance *e1i)
+{
+ /* if current TS0 byte is FAS, we cannot detect alignment */
+ if (is_correct_fas(get_ts0_hist(e1i, 0)))
+ return false;
+ if ((get_ts0_hist(e1i, 0) >> 7) == 1 &&
+ (get_ts0_hist(e1i, 2) >> 7) == 1 &&
+ (get_ts0_hist(e1i, 4) >> 7) == 0 &&
+ (get_ts0_hist(e1i, 6) >> 7) == 1 &&
+ (get_ts0_hist(e1i, 8) >> 7) == 0 &&
+ (get_ts0_hist(e1i, 10) >> 7) == 0)
+ return true;
+ else
+ return false;
+}
+
+/* Get the CRC4 that was received from our Rx TS0 history */
+static uint8_t crc4_from_ts0_hist(struct osmo_e1f_instance *e1i, bool smf2)
+{
+ uint8_t crc = 0;
+ uint8_t offset = 0;
+
+ if (smf2)
+ offset = 8;
+
+ crc |= (e1i->rx.ts0_history[0+offset] >> 7) << 3;
+ crc |= (e1i->rx.ts0_history[2+offset] >> 7) << 2;
+ crc |= (e1i->rx.ts0_history[4+offset] >> 7) << 1;
+ crc |= (e1i->rx.ts0_history[6+offset] >> 7) << 0;
+
+ return crc;
+}
+
+/* update the current in-progress CRC4 value with data from \a rx_frame */
+static void e1_rx_update_crc4(struct osmo_e1f_instance *e1i, const uint8_t *rx_frame)
+{
+ uint8_t ts0;
+
+ ts0 = rx_frame[0];
+ /* mask off the C bits */
+ if (is_correct_fas(ts0))
+ ts0 &= 0x7F;
+ e1i->rx.crc4 = crc4itu_update(e1i->rx.crc4, &ts0, 1);
+ /* add the remaining bytes/bits */
+ e1i->rx.crc4 = crc4itu_update(e1i->rx.crc4, rx_frame+1, ARRAY_SIZE(e1i->ts)-1);
+}
+
+/* FSM State handler */
+static void e1_align_search_frame(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+ struct osmo_e1f_instance *e1i = (struct osmo_e1f_instance *) fi->priv;
+
+ if (frame_alignment_recovered(e1i)) {
+ /* if we detected the 2nd FAS, we must be in FN 2 (or at least FN%2=0 */
+ e1i->rx.frame_nr = 2;
+ notify_user(e1i, E1_NTFY_EVT_ALIGN_FRAME, true, NULL);
+ osmo_fsm_inst_state_chg(fi, E1_AS_SEARCH_CRC_MFRAME, 0, 0);
+ }
+}
+
+/* FSM State handler */
+static void e1_align_search_crc_mframe(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+ struct osmo_e1f_instance *e1i = (struct osmo_e1f_instance *) fi->priv;
+
+ if (crc_mframe_alignment_achieved(e1i)) {
+ /* if we detected the 6-bit CRC multiframe signal, we must be in FN 11 */
+ e1i->rx.frame_nr = 11;
+ /* FIXME: "at least two valid CRC multiframe alignment signals can be located within
+ * 8 ms, the time separating two CRC multiframe alignment signals being 2 ms or a
+ * multiple of 2 ms" */
+ notify_user(e1i, E1_NTFY_EVT_ALIGN_CRC_MFRAME, true, NULL);
+ osmo_fsm_inst_state_chg(fi, E1_AS_ALIGNED_CRC_MFRAME, 0, 0);
+ } else {
+ /* if no mframe alignment is established within 8ms (64 frames), fall back */
+ if (e1i->rx.num_ts0_in_mframe_search >= 64) {
+ e1i->rx.num_ts0_in_mframe_search = 0;
+ osmo_fsm_inst_state_chg(fi, E1_AS_SEARCH_FRAME, 0, 0);
+ }
+ e1i->rx.num_ts0_in_mframe_search++;
+ }
+}
+
+static void e1_aligned_common(struct osmo_e1f_instance *e1i)
+{
+ uint8_t inb = get_ts0_hist(e1i, 0);
+
+ /* All non-FAS frames contain "A" bit in TS0 */
+ if (!is_correct_fas(inb & 0x7F)) {
+ bool old_alarm = e1i->rx.remote_alarm;
+ /* frame not containing the frame alignment signal */
+ if (inb & 0x20)
+ e1i->rx.remote_alarm = true;
+ else
+ e1i->rx.remote_alarm = false;
+ if (old_alarm != e1i->rx.remote_alarm)
+ notify_user(e1i, E1_NTFY_EVT_REMOTE_ALARM, e1i->rx.remote_alarm, NULL);
+ }
+}
+
+/* FSM State handler */
+static void e1_aligned_crc_mframe(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+ struct osmo_e1f_instance *e1i = (struct osmo_e1f_instance *) fi->priv;
+
+ if (frame_alignment_lost(e1i)) {
+ osmo_fsm_inst_state_chg(fi, E1_AS_SEARCH_FRAME, 0, 0);
+ return;
+ }
+
+ if (e1i->crc4_enabled) {
+ uint8_t crc_rx;
+ bool crc4_error;
+
+ /* check if we just received a complete CRC4 */
+ switch (e1i->rx.frame_nr) {
+ case 7:
+ case 15:
+ crc_rx = crc4_from_ts0_hist(e1i, e1i->rx.frame_nr == 15 ? true : false);
+ if (crc_rx != e1i->rx.crc4_last_smf)
+ crc4_error = true;
+ else
+ crc4_error = false;
+ if (crc4_error != e1i->tx.crc4_error) {
+ notify_user(e1i, E1_NTFY_EVT_CRC_ERROR, crc4_error, NULL);
+ e1i->tx.crc4_error = crc4_error;
+ }
+ /* rotate computed CRC4 one further */
+ e1i->rx.crc4_last_smf = e1i->rx.crc4;
+ e1i->rx.crc4 = crc4itu_init();
+ break;
+ default:
+ break;
+ }
+
+ /* check if the remote side reports any CRC errors */
+ switch (e1i->rx.frame_nr) {
+ case 13:
+ case 15:
+ crc4_error = false;
+ if ((get_ts0_hist(e1i, 0) >> 7) == 0)
+ crc4_error = true;
+ if (crc4_error != e1i->rx.remote_crc4_error) {
+ notify_user(e1i, E1_NTFY_EVT_REMOTE_CRC_ERROR, crc4_error, NULL);
+ e1i->rx.remote_crc4_error = crc4_error;
+ }
+ break;
+ }
+ }
+
+ e1_aligned_common(e1i);
+}
+
+/* FSM State handler */
+static void e1_aligned_basic(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+ struct osmo_e1f_instance *e1i = (struct osmo_e1f_instance *) fi->priv;
+
+ if (frame_alignment_lost(e1i)) {
+ osmo_fsm_inst_state_chg(fi, E1_AS_SEARCH_FRAME, 0, 0);
+ return;
+ }
+
+ e1_aligned_common(e1i);
+}
+
+static const struct osmo_fsm_state e1_align_states[] = {
+ [E1_AS_SEARCH_FRAME] = {
+ .name = "SEARCH_FRAME",
+ .in_event_mask = S(E1_AE_RX_TS0),
+ .out_state_mask = S(E1_AS_SEARCH_FRAME) |
+ S(E1_AS_SEARCH_CRC_MFRAME) |
+ S(E1_AS_ALIGNED_BASIC),
+ .action = e1_align_search_frame,
+ },
+ [E1_AS_SEARCH_CRC_MFRAME] = {
+ .name = "SEARCH_CRC_MFRAME",
+ .in_event_mask = S(E1_AE_RX_TS0),
+ .out_state_mask = S(E1_AS_SEARCH_FRAME) |
+ S(E1_AS_SEARCH_CRC_MFRAME) |
+ S(E1_AS_ALIGNED_CRC_MFRAME),
+ .action = e1_align_search_crc_mframe,
+ },
+ [E1_AS_ALIGNED_CRC_MFRAME] = {
+ .name = "ALIGNED_CRC_MFRAME",
+ .in_event_mask = S(E1_AE_RX_TS0),
+ .out_state_mask = S(E1_AS_SEARCH_FRAME) |
+ S(E1_AS_SEARCH_CRC_MFRAME) |
+ S(E1_AS_ALIGNED_CRC_MFRAME),
+ .action = e1_aligned_crc_mframe,
+ },
+ [E1_AS_ALIGNED_BASIC] = {
+ .name = "ALIGNED_BASIC",
+ .in_event_mask = S(E1_AE_RX_TS0),
+ .out_state_mask = S(E1_AS_SEARCH_FRAME),
+ .action = e1_aligned_basic,
+ },
+};
+
+static void e1_allstate(struct osmo_fsm_inst *fi, uint32_t event, void *data)
+{
+ struct osmo_e1f_instance *e1i = (struct osmo_e1f_instance *) fi->priv;
+
+ switch (event) {
+ case E1_AE_RESET:
+ e1i->rx.num_ts0_in_mframe_search = 0;
+ osmo_fsm_inst_state_chg(fi, E1_AS_SEARCH_FRAME, 0, 0);
+ break;
+ }
+}
+
+static struct osmo_fsm e1_align_fsm = {
+ .name = "e1-align",
+ .states = e1_align_states,
+ .num_states = ARRAY_SIZE(e1_align_states),
+ .allstate_event_mask = S(E1_AE_RESET),
+ .allstate_action = e1_allstate,
+ .log_subsys = DLGLOBAL,
+ .event_names = e1_align_evt_names,
+};
+
+static void align_fsm_reset(struct osmo_e1f_instance *e1i)
+{
+ osmo_fsm_inst_dispatch(e1i->rx.fi, E1_AE_RESET, NULL);
+}
+
+static void e1_rx_hist_add(struct osmo_e1f_instance *e1i, uint8_t inb)
+{
+ e1i->rx.ts0_history[e1i->rx.frame_nr] = inb;
+ if (e1i->rx.ts0_hist_len < 16)
+ e1i->rx.ts0_hist_len++;
+}
+
+static void e1_rx_ts0(struct osmo_e1f_instance *e1i, uint8_t inb)
+{
+ /* append just-received byte to the TS0 receive history buffer */
+ e1_rx_hist_add(e1i, inb);
+
+ /* notify the FSM that a new TS0 byte was received */
+ osmo_fsm_inst_dispatch(e1i->rx.fi, E1_AE_RX_TS0, NULL);
+
+ e1i->rx.frame_nr = (e1i->rx.frame_nr + 1) % 16;
+}
+
+static void e1_rx_tsN(struct osmo_e1f_instance_ts *e1t, uint8_t inb)
+{
+ struct msgb *msg;
+ int count, rc;
+
+ if (!e1t->rx.enabled)
+ return;
+
+ if (!e1t->rx.msg)
+ e1t->rx.msg = msgb_alloc(e1t->rx.granularity, "E1 Rx");
+ msg = e1t->rx.msg;
+ OSMO_ASSERT(msg);
+
+ switch (e1t->mode) {
+ case OSMO_E1F_TS_RAW:
+ /* append byte at end of msgb */
+ msgb_put_u8(msg, inb);
+ /* flush msgb, if full */
+ if (msgb_tailroom(msg) <= 0) {
+ goto flush;
+ }
+ break;
+ case OSMO_E1F_TS_HDLC_CRC:
+ rc = osmo_isdnhdlc_decode(&e1t->rx.hdlc, &inb, 1, &count,
+ msgb_data(msg), msgb_tailroom(msg));
+ switch (rc) {
+ case -OSMO_HDLC_FRAMING_ERROR:
+ fprintf(stdout, "Framing Error\n");
+ break;
+ case -OSMO_HDLC_CRC_ERROR:
+ fprintf(stdout, "CRC Error\n");
+ break;
+ case -OSMO_HDLC_LENGTH_ERROR:
+ fprintf(stdout, "Length Error\n");
+ break;
+ case 0:
+ /* no output yet */
+ break;
+ default:
+ msgb_put(msg, rc);
+ goto flush;
+ }
+ break;
+ }
+
+ return;
+flush:
+
+ if (!e1t->rx.data_cb)
+ msgb_free(msg);
+ else
+ e1t->rx.data_cb(e1t, msg);
+ e1t->rx.msg = NULL;
+}
+
+/*! Receive a single E1 frame of 32x8 (=256) bits
+ * \param e1i E1 instance for which the frame was received
+ * \param[in] in_frame caller-provided buffer of 32 octets
+ *
+ * The idea is that whoever calls us will already have done the bit-alignment,
+ * i.e. the first bit of TS0 of the frame will be octet-aligned and hence the
+ * entire 256bit buffer is provided as octet-aligned 32bytes in \a in_frame.
+ */
+int osmo_e1f_rx_frame(struct osmo_e1f_instance *e1i, const uint8_t *in_frame)
+{
+ int i;
+
+ e1_rx_update_crc4(e1i, in_frame);
+
+ e1_rx_ts0(e1i, in_frame[0]);
+
+ for (i = 1; i < ARRAY_SIZE(e1i->ts); i++) {
+ struct osmo_e1f_instance_ts *e1t = &e1i->ts[i];
+ e1_rx_tsN(e1t, in_frame[i]);
+ }
+
+ return 0;
+}
+
+int osmo_e1f_init(void)
+{
+ return osmo_fsm_register(&e1_align_fsm);
+}
diff --git a/src/e1gen/osmo_e1f.h b/src/e1gen/osmo_e1f.h
new file mode 100644
index 0000000..0b423d9
--- /dev/null
+++ b/src/e1gen/osmo_e1f.h
@@ -0,0 +1,123 @@
+#pragma once
+
+#include <stdint.h>
+#include <stdbool.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/linuxlist.h>
+#include <osmocom/core/fsm.h>
+#include <osmocom/core/isdnhdlc.h>
+
+struct osmo_e1f_tx_state {
+ bool remote_alarm;
+ bool crc4_error;
+ bool ais;
+ /* lower 5 bits: Sa4..Sa8 */
+ uint8_t sa4_sa8;
+ /* frame number 0..15 */
+ uint8_t frame_nr;
+ uint8_t crc4_last_smf;
+ uint8_t crc4;
+};
+
+struct osmo_e1f_rx_state {
+ uint8_t frame_nr;
+ /* history of rceived TS0 octets */
+ uint8_t ts0_history[16];
+ uint8_t ts0_hist_len;
+ /* was a remote alarm received? */
+ bool remote_alarm;
+ bool remote_crc4_error;
+ /* number of TS0 bytes received since entering CRC mframe search */
+ uint8_t num_ts0_in_mframe_search;
+ struct osmo_fsm_inst *fi;
+ /* computed CRC4 */
+ uint8_t crc4_last_smf;
+ uint8_t crc4;
+};
+
+enum osmo_e1f_notify_event {
+ E1_NTFY_EVT_ALIGN_FRAME,
+ E1_NTFY_EVT_ALIGN_CRC_MFRAME,
+ E1_NTFY_EVT_CRC_ERROR,
+ E1_NTFY_EVT_REMOTE_CRC_ERROR,
+ E1_NTFY_EVT_REMOTE_ALARM,
+};
+
+enum osmo_e1f_ts_mode {
+ OSMO_E1F_TS_RAW,
+ OSMO_E1F_TS_HDLC_CRC,
+};
+
+struct osmo_e1f_instance_ts;
+struct osmo_e1f_instance;
+typedef void (*e1_data_cb)(struct osmo_e1f_instance_ts *ts, struct msgb *msg);
+typedef void (*e1_notify_cb)(struct osmo_e1f_instance *e1i, enum osmo_e1f_notify_event evt,
+ bool present, void *data);
+
+struct osmo_e1f_instance_ts {
+ /* timeslot number */
+ uint8_t ts_nr;
+ /* mode in which we operate (RAW/HDLC) */
+ enum osmo_e1f_ts_mode mode;
+ /* back-pointer to e1 instance */
+ struct osmo_e1f_instance *inst;
+ struct {
+ /* optional HDLC encoder state */
+ struct osmo_isdnhdlc_vars hdlc;
+ /* queue of pending to-be-transmitted messages */
+ struct llist_head queue;
+ unsigned long underruns;
+ } tx;
+ struct {
+ /* optional HDLC decoder state */
+ struct osmo_isdnhdlc_vars hdlc;
+ bool enabled;
+ /* how many bytes to buffer before calling call-back */
+ unsigned int granularity;
+ /* current receive buffer */
+ struct msgb *msg;
+ e1_data_cb data_cb;
+ /* private data, relevant to user */
+ void *priv;
+ } rx;
+};
+
+struct osmo_e1f_instance {
+ /* list; currently not used yet */
+ struct llist_head list;
+
+ /* is CRC4 generation + parsing enabled? */
+ bool crc4_enabled;
+ /* notification call-back function */
+ e1_notify_cb notify_cb;
+
+ /* Rx + Tx related state */
+ struct osmo_e1f_tx_state tx;
+ struct osmo_e1f_rx_state rx;
+
+ /* our 32 timeslots (only 1..32 are used) */
+ struct osmo_e1f_instance_ts ts[32];
+
+ /* private data, relevant to user */
+ void *priv;
+};
+
+extern const struct value_string osmo_e1f_notifv_evt_names[];
+
+static inline const char *osmo_e1f_notify_event_name(enum osmo_e1f_notify_event evt) {
+ return get_value_string(osmo_e1f_notifv_evt_names, evt);
+}
+
+int osmo_e1f_init(void);
+struct osmo_e1f_instance_ts *osmo_e1f_instance_ts(struct osmo_e1f_instance *e1i, uint8_t ts_nr);
+int osmo_e1f_instance_init(struct osmo_e1f_instance *e1i, const char *name, e1_notify_cb cb,
+ bool crc4_enabled, void *priv);
+void osmo_e1f_instance_reset(struct osmo_e1f_instance *e1i);
+int osmo_e1f_ts_config(struct osmo_e1f_instance_ts *e1t, e1_data_cb cb, unsigned int granularity,
+ bool enable, enum osmo_e1f_ts_mode mode);
+void osmo_e1f_ts_reset(struct osmo_e1f_instance_ts *e1t);
+
+
+void osmo_e1f_ts_enqueue(struct osmo_e1f_instance_ts *e1t, struct msgb *msg);
+int osmo_e1f_pull_tx_frame(struct osmo_e1f_instance *e1i, uint8_t *out_frame);
+int osmo_e1f_rx_frame(struct osmo_e1f_instance *e1i, const uint8_t *in_frame);
diff --git a/src/osmo-e1gen.c b/src/osmo-e1gen.c
new file mode 100644
index 0000000..15d677a
--- /dev/null
+++ b/src/osmo-e1gen.c
@@ -0,0 +1,438 @@
+/*
+ * osmo-e1gen.c
+ *
+ * (C) 2020 by Harald Welte <laforge@gnumonks.org>
+ *
+ * All Rights Reserved
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ *
+ * 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 <errno.h>
+#include <sched.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+
+#define _GNU_SOURCE
+#include <getopt.h>
+
+#include <talloc.h>
+
+#include <osmocom/core/application.h>
+#include <osmocom/core/msgb.h>
+#include <osmocom/core/select.h>
+#include <osmocom/vty/telnet_interface.h>
+#include <osmocom/vty/logging.h>
+#include <osmocom/vty/vty.h>
+#include <osmocom/vty/command.h>
+
+#include "e1d.h"
+#include "usb.h"
+#include "log.h"
+
+#include "e1gen/osmo_e1f.h"
+
+#ifndef OSMO_VTY_PORT_E1D
+#define OSMO_VTY_PORT_E1D 4269
+#endif
+
+/***********************************************************************
+ * global variables
+ ***********************************************************************/
+
+extern struct e1_daemon *vty_e1d;
+static const char *g_config_file = "osmo-e1d.cfg";
+static void *g_e1d_ctx = NULL;
+static int g_shutdown = 0;
+
+/***********************************************************************
+ * stubs for external linkage of normal osmo-e1d
+ ***********************************************************************/
+
+void e1_ts_stop(struct e1_ts *ts) {}
+int e1d_vpair_create(struct e1_daemon *e1d, unsigned int num_lines) { return -1; }
+struct e1_intf *e1d_vpair_intf_peer(struct e1_intf *intf) { return NULL; }
+
+
+
+struct e1gen_line_data {
+ struct ice1usb_tx_config tx_config;
+ struct ice1usb_rx_config rx_config;
+ struct osmo_e1f_instance e1f;
+};
+
+static void e1f_notify_cb(struct osmo_e1f_instance *e1f, enum osmo_e1f_notify_event evt,
+ bool present, void *data)
+{
+ struct e1_line *line = e1f->priv;
+ LOGPLI(line, DE1D, LOGL_NOTICE, "NOTIFY: %s %s\n",
+ osmo_e1f_notify_event_name(evt), present ? "PRESENT" : "ABSENT");
+}
+
+static const struct e1gen_line_data default_ld = {
+ .tx_config = {
+ .mode = ICE1USB_TX_MODE_TRANSP,
+ .timing = ICE1USB_TX_TIME_SRC_LOCAL,
+ .ext_loopback = ICE1USB_TX_EXT_LOOPBACK_OFF,
+ .alarm = 0,
+ },
+ .rx_config = {
+ .mode = ICE1USB_RX_MODE_MULTIFRAME,
+ //.mode = ICE1USB_RX_MODE_TRANSP,
+ },
+};
+
+struct e1gen_line_data *ensure_gld(struct e1_line *line)
+{
+ struct e1gen_line_data *gld = (struct e1gen_line_data *) line->e1gen_priv;
+
+ if (gld)
+ return gld;
+
+ LOGPLI(line, DE1D, LOGL_INFO, "Creating e1gen structures\n");
+
+ line->e1gen_priv = gld = talloc_zero(line, struct e1gen_line_data);
+ gld->tx_config = default_ld.tx_config;
+ gld->rx_config = default_ld.rx_config;
+ osmo_e1f_instance_init(&gld->e1f, "LINE", e1f_notify_cb, true, line);
+
+ /* set the default configuration */
+ e1_usb_ctrl_set_tx_cfg(line, gld->tx_config.mode, gld->tx_config.timing,
+ gld->tx_config.ext_loopback, gld->tx_config.alarm);
+ e1_usb_ctrl_set_rx_cfg(line, gld->rx_config.mode);
+
+ return gld;
+}
+
+/*! process (demultiplex) input data for the specified e1_line.
+ * \param[in] line E1 line for which to genrate output data
+ * \param[in] buf input buffer of multiplexed data received on line
+ * \param[in] size size of buf in octets */
+int e1_line_demux_in(struct e1_line *line, const uint8_t *buf, int size, int frame_base)
+{
+ struct e1gen_line_data *gld = ensure_gld(line);
+ int offs;
+
+ for (offs = 0; offs + 32 <= size; offs += 32) {
+ //printf("Rx "OSMO_BIT_SPEC"\n", OSMO_BIT_PRINT(buf[offs]));
+ //printf("Rx %s\n", osmo_hexdump(buf + offs, 32));
+ osmo_e1f_rx_frame(&gld->e1f, buf + offs);
+ }
+ return 0;
+}
+
+/*! generate (multiplex) output data for the specified e1_line
+ * \param[in] line E1 line for which to genrate output data
+ * \param[in] buf caller-allocated output buffer for multiplexed data
+ * \param[in] fts number of E1 frames (32 bytes each) to generate
+ * \return number of bytes written to buf */
+int e1_line_mux_out(struct e1_line *line, uint8_t *buf, int fts)
+{
+ struct e1gen_line_data *gld = ensure_gld(line);
+ int f;
+
+ //printf("FRAME:\n");
+ for (f = 0; f < fts; f++) {
+ osmo_e1f_pull_tx_frame(&gld->e1f, buf + f*32);
+ //printf("Tx "OSMO_BIT_SPEC"\n", OSMO_BIT_PRINT(buf[f*32]));
+ //printf("Tx %s\n", osmo_hexdump(buf + f*32, 32));
+ }
+
+ return 32*fts;
+}
+
+static struct cmd_node line_node = {
+ (enum node_type) LINE_NODE,
+ "%s(line)# ",
+ 1,
+};
+
+#define TX_STR "Transmitter\n"
+#define OFF_ON_STR "Off\n" "On\n"
+
+DEFUN(line_tx_alarm, line_tx_alarm_cmd,
+ "tx report-alarm (0|1)",
+ TX_STR "Report Alarm (A-Bits)\n" OFF_ON_STR)
+{
+ struct e1_line *line = vty->index;
+ struct e1gen_line_data *gld = ensure_gld(line);
+ int on = atoi(argv[0]);
+
+ gld->e1f.tx.remote_alarm = on ? true : false;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(line_tx_crc4, line_tx_crc4_cmd,
+ "tx generate-crc4 (0|1)",
+ TX_STR "Generate CRC4\n" OFF_ON_STR)
+{
+ struct e1_line *line = vty->index;
+ struct e1gen_line_data *gld = ensure_gld(line);
+ int on = atoi(argv[0]);
+
+ gld->e1f.crc4_enabled = on ? true : false;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(line_tx_report_crc4, line_tx_report_crc4_cmd,
+ "tx report-crc4-error (0|1)",
+ TX_STR "Report a CRC4 Error\n" OFF_ON_STR)
+{
+ struct e1_line *line = vty->index;
+ struct e1gen_line_data *gld = ensure_gld(line);
+ int on = atoi(argv[0]);
+
+ gld->e1f.tx.crc4_error = on ? true : false;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(line_tx_sa48, line_tx_sa48_cmd,
+ "tx sa4 <0-31>",
+ TX_STR "Set the SA4..SA8 bit content\n")
+{
+ struct e1_line *line = vty->index;
+ struct e1gen_line_data *gld = ensure_gld(line);
+
+ gld->e1f.tx.sa4_sa8 = atoi(argv[0]);
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(line_tx_ais, line_tx_ais_cmd,
+ "tx ais (0|1)",
+ TX_STR "Transmit AIS (All-1)\n" OFF_ON_STR)
+{
+ struct e1_line *line = vty->index;
+ struct e1gen_line_data *gld = ensure_gld(line);
+ int on = atoi(argv[0]);
+
+ gld->e1f.tx.ais = on ? true : false;
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(line_show, line_show_cmd,
+ "show", "Show Line status\n")
+{
+ struct e1_line *line = vty->index;
+ struct e1gen_line_data *gld = ensure_gld(line);
+ struct osmo_e1f_instance *e1f = &gld->e1f;
+
+ vty_out(vty, "Rx RemoteAlarm=%u, RemoteCrcErr=%u%s",
+ e1f->rx.remote_alarm, e1f->rx.remote_crc4_error, VTY_NEWLINE);
+ vty_out(vty, "Tx RemoteAlarm=%u, CrcErr=%u%s",
+ e1f->tx.remote_alarm, e1f->tx.crc4_error, VTY_NEWLINE);
+
+ return CMD_SUCCESS;
+}
+
+DEFUN(line, line_cmd,
+ "interface <0-255> line <0-225>",
+ "E1 Interface\n" "E1 Interface\n"
+ "E1 Line number\n" "E1 Line number\n")
+{
+ struct e1_intf *intf;
+ struct e1_line *line;
+
+ intf = e1d_find_intf(vty_e1d, atoi(argv[0]));
+ if (!intf) {
+ vty_out(vty, "No such interface %s%s", argv[0], VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ line = e1_intf_find_line(intf, atoi(argv[1]));
+ if (!line) {
+ vty_out(vty, "No such line %s in interface %s%s", argv[1], argv[0], VTY_NEWLINE);
+ return CMD_WARNING;
+ }
+
+ vty->node = LINE_NODE;
+ vty->index = line;
+
+ return CMD_SUCCESS;
+}
+
+static void e1gen_init(void)
+{
+ install_element(ENABLE_NODE, &line_cmd);
+ install_node(&line_node, NULL);
+ install_element(LINE_NODE, &line_tx_alarm_cmd);
+ install_element(LINE_NODE, &line_tx_crc4_cmd);
+ install_element(LINE_NODE, &line_tx_report_crc4_cmd);
+ install_element(LINE_NODE, &line_tx_sa48_cmd);
+ install_element(LINE_NODE, &line_tx_ais_cmd);
+ install_element(LINE_NODE, &line_show_cmd);
+}
+
+/***********************************************************************
+ * initialization (mostly shared with osmo-e1d.c
+ ***********************************************************************/
+
+static struct vty_app_info vty_info = {
+ .name = "osmo-e1gen",
+ .version = PACKAGE_VERSION,
+ .copyright =
+ "(C) 2019-2020 by Sylvain Munaut and Harald Welte\r\n",
+ "License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl-2.0.html>\r\n"
+ "This is free software: you are free to change and redistribute it.\r\n"
+ "There is NO WARRANTY, to the extent permitted by law.\r\n",
+};
+
+static void sig_handler(int signo)
+{
+ fprintf(stdout, "signal %d received\n", signo);
+ switch (signo) {
+ case SIGINT:
+ case SIGTERM:
+ fprintf(stdout, "shutting down\n");
+ g_shutdown = 1;
+ break;
+ case SIGABRT:
+ case SIGUSR1:
+ talloc_report(g_e1d_ctx, stderr);
+ talloc_report_full(g_e1d_ctx, stderr);
+ break;
+ case SIGUSR2:
+ talloc_report_full(g_e1d_ctx, stderr);
+ break;
+ default:
+ break;
+ }
+}
+
+static void print_help(void)
+{
+ printf(" Some useful help...\n");
+ printf(" -h --help This text.\n");
+ printf(" -d --debug option --debug=DE1D:DXFR enable debugging.\n");
+ printf(" -c --config-file filename The config file to use.\n");
+}
+
+static void handle_options(int argc, char **argv)
+{
+ while (1) {
+ int option_index = 0, c;
+ static const struct option long_options[] = {
+ {"help", 0, 0, 'h'},
+ {"debug", 1, 0, 'd'},
+ {"config-file", 1, 0, 'c'},
+ {0, 0, 0, 0}
+ };
+
+ c = getopt_long(argc, argv, "hd:c:", long_options, &option_index);
+ if (c == -1)
+ break;
+
+ switch (c) {
+ case 'h':
+ print_help();
+ exit(0);
+ break;
+ case 'd':
+ log_parse_category_mask(osmo_stderr_target, optarg);
+ break;
+ case 'c':
+ g_config_file = optarg;
+ break;
+ default:
+ fprintf(stderr, "Error in command line options. Exiting.\n");
+ exit(-1);
+ }
+ }
+
+ if (argc > optind) {
+ fprintf(stderr, "Unsupported positional arguments on command line\n");
+ exit(2);
+ }
+}
+
+int main(int argc, char **argv)
+{
+ struct e1_daemon *e1d = NULL;
+ struct sched_param sp;
+ int rv;
+
+ /* talloc init */
+ g_e1d_ctx = talloc_named_const(NULL, 0, "osmo-e1d");
+ msgb_talloc_ctx_init(g_e1d_ctx, 0);
+
+ /* logging init */
+ osmo_init_logging2(g_e1d_ctx, &log_info);
+
+ /* signals init */
+ signal(SIGINT, &sig_handler);
+ signal(SIGTERM, &sig_handler);
+ signal(SIGABRT, &sig_handler);
+ signal(SIGUSR1, &sig_handler);
+ signal(SIGUSR2, &sig_handler);
+ osmo_init_ignore_signals();
+
+ /* rt prio */
+ memset(&sp, 0x00, sizeof(sp));
+ sp.sched_priority = 50;
+ rv = sched_setscheduler(0, SCHED_RR, &sp);
+ if (rv != 0) {
+ LOGP(DE1D, LOGL_ERROR, "Failed to set Real-Time priority. USB comms might be unstable.\n");
+ perror("sched_setscheduler");
+ }
+
+ /* main state */
+ e1d = talloc_zero(g_e1d_ctx, struct e1_daemon);
+ OSMO_ASSERT(e1d);
+
+ INIT_LLIST_HEAD(&e1d->interfaces);
+ vty_init(&vty_info);
+ logging_vty_add_cmds();
+ e1d_vty_init(e1d);
+
+ handle_options(argc, argv);
+
+ rv = vty_read_config_file(g_config_file, NULL);
+ if (rv < 0) {
+ LOGP(DE1D, LOGL_FATAL, "Failed to parse the config file '%s'\n", g_config_file);
+ exit(2);
+ }
+
+ rv = telnet_init_dynif(g_e1d_ctx, e1d, vty_get_bind_addr(), OSMO_VTY_PORT_E1D);
+ if (rv != 0) {
+ LOGP(DE1D, LOGL_FATAL, "Failed to bind VTY interface to %s:%u\n",
+ vty_get_bind_addr(), OSMO_VTY_PORT_E1D);
+ exit(1);
+ }
+
+ osmo_e1f_init();
+ e1gen_init();
+
+ /* probe devices */
+ rv = e1_usb_probe(e1d);
+ if (rv != 0) {
+ LOGP(DE1D, LOGL_ERROR, "Failed to prove usb devices\n");
+ }
+
+ /* main loop */
+ while (!g_shutdown) {
+ osmo_select_main(0);
+ }
+
+ talloc_free(e1d);
+
+ return 0;
+}