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libosmo-abis/src/e1_input.c

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/* OpenBSC Abis interface to E1 */
/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
*
* All Rights Reserved
*
* SPDX-License-Identifier: AGPL-3.0+
*
* 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 "internal.h"
#include "../config.h"
#include <stdio.h>
#include <unistd.h>
#include <inttypes.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <osmocom/abis/lapd.h>
#include <osmocom/core/linuxlist.h>
#include <osmocom/core/talloc.h>
#include <osmocom/core/rate_ctr.h>
#include <osmocom/core/logging.h>
#include <osmocom/core/signal.h>
#include <osmocom/core/endian.h>
#include <osmocom/gsm/i460_mux.h>
#include <osmocom/abis/e1_input.h>
#define NUM_E1_TS 32
static void *tall_e1inp_ctx;
/* list of all E1 drivers */
LLIST_HEAD(e1inp_driver_list);
/* list of all E1 lines */
LLIST_HEAD(e1inp_line_list);
static void *tall_sigl_ctx;
static const struct rate_ctr_desc e1inp_ctr_d[] = {
[E1I_CTR_HDLC_ABORT] = {
"hdlc:abort", "HDLC abort"
},
[E1I_CTR_HDLC_BADFCS] = {
"hdlc:bad_fcs", "HLDC Bad FCS"
},
[E1I_CTR_HDLC_OVERR] = {
"hdlc:overrun", "HDLC Overrun"
},
[E1I_CTR_ALARM] = {
"alarm", "Alarm"
},
[E1I_CTR_REMOVED] = {
"removed", "Line removed"
},
};
static const struct rate_ctr_group_desc e1inp_ctr_g_d = {
.group_name_prefix = "e1inp",
.group_description = "E1 Input subsystem",
.num_ctr = ARRAY_SIZE(e1inp_ctr_d),
.ctr_desc = e1inp_ctr_d,
};
/*
* pcap writing of the misdn load
* pcap format is from http://wiki.wireshark.org/Development/LibpcapFileFormat
*/
#define DLT_LINUX_LAPD 177
#define PCAP_INPUT 0
#define PCAP_OUTPUT 1
struct pcap_hdr {
uint32_t magic_number;
uint16_t version_major;
uint16_t version_minor;
int32_t thiszone;
uint32_t sigfigs;
uint32_t snaplen;
uint32_t network;
} __attribute__((packed));
struct pcaprec_hdr {
uint32_t ts_sec;
uint32_t ts_usec;
uint32_t incl_len;
uint32_t orig_len;
} __attribute__((packed));
struct fake_linux_lapd_header {
uint16_t pkttype;
uint16_t hatype;
uint16_t halen;
uint64_t addr;
int16_t protocol;
} __attribute__((packed));
struct lapd_header {
#if OSMO_IS_LITTLE_ENDIAN
uint8_t ea1 : 1;
uint8_t cr : 1;
uint8_t sapi : 6;
uint8_t ea2 : 1;
uint8_t tei : 7;
uint8_t control_foo; /* fake UM's ... */
#elif OSMO_IS_BIG_ENDIAN
/* auto-generated from the little endian part above (libosmocore/contrib/struct_endianess.py) */
uint8_t sapi:6, cr:1, ea1:1;
uint8_t tei:7, ea2:1;
uint8_t control_foo;
#endif
} __attribute__((packed));
osmo_static_assert(offsetof(struct fake_linux_lapd_header, hatype) == 2, hatype_offset);
osmo_static_assert(offsetof(struct fake_linux_lapd_header, halen) == 4, halen_offset);
osmo_static_assert(offsetof(struct fake_linux_lapd_header, addr) == 6, addr_offset);
osmo_static_assert(offsetof(struct fake_linux_lapd_header, protocol) == 14, proto_offset);
osmo_static_assert(sizeof(struct fake_linux_lapd_header) == 16, lapd_header_size);
int e1_set_pcap_fd2(struct e1inp_line *line, int fd)
{
static const struct pcap_hdr header = {
.magic_number = 0xa1b2c3d4,
.version_major = 2,
.version_minor = 4,
.thiszone = 0,
.sigfigs = 0,
.snaplen = 65535,
.network = DLT_LINUX_LAPD,
};
int i;
/* write header */
if (fd >= 0) {
int rc = write(fd, &header, sizeof(header));
if (rc < 0)
return rc;
}
/* Set the PCAP file descriptor for all timeslots that have
* software LAPD instances, to ensure the osmo_lapd_pcap code is
* used to write PCAP files (if requested) */
for (i = 0; i < ARRAY_SIZE(line->ts); i++) {
struct e1inp_ts *e1i_ts = &line->ts[i];
if (e1i_ts->lapd)
e1i_ts->lapd->pcap_fd = fd;
}
/* close previous and update */
if (line->pcap_fd >= 0)
close(line->pcap_fd);
line->pcap_fd = fd;
return 0;
}
static int pcap_fd = -1;
int e1_set_pcap_fd(int fd)
{
const struct pcap_hdr header = {
.magic_number = 0xa1b2c3d4,
.version_major = 2,
.version_minor = 4,
.thiszone = 0,
.sigfigs = 0,
.snaplen = 65535,
.network = DLT_LINUX_LAPD,
};
struct e1inp_line *line;
int i;
/* write header */
if (fd >= 0) {
int rc = write(fd, &header, sizeof(header));
if (rc < 0)
return rc;
}
/* update fd in all lines in our global list of e1 lines */
llist_for_each_entry(line, &e1inp_line_list, list) {
/* Set the PCAP file descriptor for all timeslots that have
* software LAPD instances, to ensure the osmo_lapd_pcap code is
* used to write PCAP files (if requested) */
for (i = 0; i < ARRAY_SIZE(line->ts); i++) {
struct e1inp_ts *e1i_ts = &line->ts[i];
if (e1i_ts->lapd)
e1i_ts->lapd->pcap_fd = fd;
}
}
/* close previous and update global */
if (pcap_fd >= 0)
close(pcap_fd);
pcap_fd = fd;
return 0;
}
/* This currently only works for the D-Channel */
static void write_pcap_packet(int direction, int sapi, int tei,
struct msgb *msg, int pcap_fd) {
if (pcap_fd < 0)
return;
time_t cur_time;
struct tm *tm;
struct fake_linux_lapd_header header = {
.pkttype = 4,
.hatype = 0,
.halen = 0,
.addr = direction == PCAP_OUTPUT ? 0x0 : 0x1,
.protocol = ntohs(48),
};
struct lapd_header lapd_header = {
.ea1 = 0,
.cr = direction == PCAP_OUTPUT ? 1 : 0,
.sapi = sapi & 0x3F,
.ea2 = 1,
.tei = tei & 0x7F,
.control_foo = 0x03 /* UI */,
};
struct pcaprec_hdr payload_header = {
.ts_sec = 0,
.ts_usec = 0,
.incl_len = msgb_l2len(msg) + sizeof(struct fake_linux_lapd_header)
+ sizeof(struct lapd_header),
.orig_len = msgb_l2len(msg) + sizeof(struct fake_linux_lapd_header)
+ sizeof(struct lapd_header),
};
cur_time = time(NULL);
tm = localtime(&cur_time);
payload_header.ts_sec = mktime(tm);
write(pcap_fd, &payload_header, sizeof(payload_header));
write(pcap_fd, &header, sizeof(header));
write(pcap_fd, &lapd_header, sizeof(lapd_header));
write(pcap_fd, msg->l2h, msgb_l2len(msg));
}
const struct value_string e1inp_sign_type_names[5] = {
{ E1INP_SIGN_NONE, "None" },
{ E1INP_SIGN_OML, "OML" },
{ E1INP_SIGN_RSL, "RSL" },
{ E1INP_SIGN_OSMO, "OSMO" },
{ 0, NULL }
};
const char *e1inp_signtype_name(enum e1inp_sign_type tp)
{
return get_value_string(e1inp_sign_type_names, tp);
}
const struct value_string e1inp_ts_type_names[] = {
{ E1INP_TS_TYPE_NONE, "None" },
{ E1INP_TS_TYPE_SIGN, "Signalling" },
{ E1INP_TS_TYPE_TRAU, "TRAU" },
{ E1INP_TS_TYPE_RAW, "RAW" },
{ E1INP_TS_TYPE_HDLC, "HDLC" },
{ E1INP_TS_TYPE_I460, "I460" },
{ 0, NULL }
};
const char *e1inp_tstype_name(enum e1inp_ts_type tp)
{
return get_value_string(e1inp_ts_type_names, tp);
}
int abis_sendmsg(struct msgb *msg)
{
struct e1inp_sign_link *sign_link = msg->dst;
struct e1inp_driver *e1inp_driver;
struct e1inp_ts *e1i_ts;
msg->l2h = msg->data;
/* don't know how to route this message. */
if (sign_link == NULL) {
LOGP(DLINP, LOGL_ERROR, "abis_sendmsg: msg->dst == NULL: %s\n",
osmo_hexdump(msg->data, msg->len));
talloc_free(msg);
return -EINVAL;
}
e1i_ts = sign_link->ts;
if (!osmo_timer_pending(&e1i_ts->sign.tx_timer)) {
/* notify the driver we have something to write */
e1inp_driver = sign_link->ts->line->driver;
e1inp_driver->want_write(e1i_ts);
}
msgb_enqueue(&sign_link->tx_list, msg);
/* we only need to write a 'Fake LAPD' packet here, if the
* underlying driver hides LAPD from us. If we use the
* libosmocore LAPD implementation, it will take care of writing
* the _actual_ LAPD packet */
if (!e1i_ts->lapd) {
write_pcap_packet(PCAP_OUTPUT, sign_link->sapi,
sign_link->tei, msg, e1i_ts->line->pcap_fd);
}
return 0;
}
int abis_rsl_sendmsg(struct msgb *msg)
{
return abis_sendmsg(msg);
}
int e1inp_ts_send_raw(struct e1inp_ts *ts, struct msgb *msg)
{
struct e1inp_driver *driver;
OSMO_ASSERT(ts->type == E1INP_TS_TYPE_RAW);
/* notify the driver we have something to write */
driver = ts->line->driver;
driver->want_write(ts);
msgb_enqueue(&ts->raw.tx_queue, msg);
return 0;
}
int e1inp_ts_send_hdlc(struct e1inp_ts *ts, struct msgb *msg)
{
struct e1inp_driver *driver;
OSMO_ASSERT(ts->type == E1INP_TS_TYPE_HDLC);
/* notify the driver we have something to write */
driver = ts->line->driver;
driver->want_write(ts);
msgb_enqueue(&ts->hdlc.tx_queue, msg);
return 0;
}
/* Timeslot */
int e1inp_ts_config_trau(struct e1inp_ts *ts, struct e1inp_line *line,
int (*trau_rcv_cb)(struct subch_demux *dmx, int ch,
const ubit_t *data, int len, void *_priv))
{
if (ts->type == E1INP_TS_TYPE_TRAU && ts->line && line)
return 0;
ts->type = E1INP_TS_TYPE_TRAU;
ts->line = line;
subchan_mux_init(&ts->trau.mux);
ts->trau.demux.out_cb = trau_rcv_cb;
ts->trau.demux.data = ts;
subch_demux_init(&ts->trau.demux);
return 0;
}
int e1inp_ts_config_i460(struct e1inp_ts *ts, struct e1inp_line *line)
{
if (ts->type == E1INP_TS_TYPE_I460 && ts->line && line)
return 0;
ts->type = E1INP_TS_TYPE_I460;
ts->line = line;
osmo_i460_ts_init(&ts->i460.i460_ts);
return 0;
}
void e1inp_ts_name(char *out, size_t out_len, const struct e1inp_ts *ts)
{
if (ts->line->name)
snprintf(out, out_len, "%s:%u", ts->line->name, ts->num);
else
snprintf(out, out_len, "%u:%u", ts->line->num, ts->num);
}
int e1inp_ts_config_sign(struct e1inp_ts *ts, struct e1inp_line *line)
{
if (ts->type == E1INP_TS_TYPE_SIGN && ts->line && line)
return 0;
ts->type = E1INP_TS_TYPE_SIGN;
ts->line = line;
if (line && line->driver)
ts->sign.delay = line->driver->default_delay;
else
ts->sign.delay = 100000;
INIT_LLIST_HEAD(&ts->sign.sign_links);
return 0;
}
int e1inp_ts_config_raw(struct e1inp_ts *ts, struct e1inp_line *line,
void (*raw_recv_cb)(struct e1inp_ts *ts,
struct msgb *msg))
{
if (ts->type == E1INP_TS_TYPE_RAW && ts->line && line)
return 0;
ts->type = E1INP_TS_TYPE_RAW;
ts->line = line;
ts->raw.recv_cb = raw_recv_cb;
INIT_LLIST_HEAD(&ts->raw.tx_queue);
return 0;
}
int e1inp_ts_config_hdlc(struct e1inp_ts *ts, struct e1inp_line *line,
void (*hdlc_recv_cb)(struct e1inp_ts *ts,
struct msgb *msg))
{
if (ts->type == E1INP_TS_TYPE_HDLC && ts->line && line)
return 0;
ts->type = E1INP_TS_TYPE_HDLC;
ts->line = line;
ts->hdlc.recv_cb = hdlc_recv_cb;
INIT_LLIST_HEAD(&ts->hdlc.tx_queue);
return 0;
}
int e1inp_ts_config_none(struct e1inp_ts *ts, struct e1inp_line *line)
{
if (ts->type == E1INP_TS_TYPE_NONE && ts->line && line)
return 0;
ts->type = E1INP_TS_TYPE_NONE;
ts->line = line;
return 0;
}
int e1inp_ts_set_sa_bits(struct e1inp_line *line, uint8_t sa_bits)
{
struct e1inp_driver *driver;
driver = line->driver;
if (!driver->set_sa_bits)
return -ENOTSUP;
return driver->set_sa_bits(line, sa_bits);
}
static int e1inp_line_use_cb(struct osmo_use_count_entry *use_count_entry, int32_t old_use_count,
const char *file, int file_line)
{
char buf[512];
struct osmo_use_count *uc = use_count_entry->use_count;
struct e1inp_line *line = uc->talloc_object;
LOGPSRC(DLINP, LOGL_INFO, file, file_line,
"E1L(%u) Line (%p) reference count %s changed %" PRId32 " -> %" PRId32 " [%s]\n",
(line)->num, line, use_count_entry->use,
old_use_count, use_count_entry->count,
osmo_use_count_name_buf(buf, sizeof(buf), uc));
if (!use_count_entry->count)
osmo_use_count_free(use_count_entry);
if (osmo_use_count_total(uc) > 0)
return 0;
/* Remove our counter group from libosmocore's global counter
* list if we are freeing the last remaining talloc context.
* Otherwise we get a use-after-free when libosmocore's timer
* ticks again and attempts to update these counters (OS#3011).
*
* Note that talloc internally counts "secondary" references
* _in addition to_ the initial allocation context, so yes,
* we must check for *zero* remaining secondary contexts here. */
if (talloc_reference_count(line->rate_ctr) == 0) {
rate_ctr_group_free(line->rate_ctr);
} else {
/* We are not freeing the last talloc context.
* Instead of calling talloc_free(), unlink this 'line' pointer
* which serves as one of several talloc contexts for the rate
* counters and driver private state. */
talloc_unlink(line, line->rate_ctr);
if (line->driver_data)
talloc_unlink(line, line->driver_data);
}
llist_del(&line->list);
talloc_free(line);
return 0;
}
struct e1inp_line *e1inp_line_find(uint8_t e1_nr)
{
struct e1inp_line *e1i_line;
/* iterate over global list of e1 lines */
llist_for_each_entry(e1i_line, &e1inp_line_list, list) {
if (e1i_line->num == e1_nr)
return e1i_line;
}
return NULL;
}
/*! Create a new e1inp line object.
* \param[in] e1_nr The line number of the new line to be created.
* \param[in] driver_name String identifying the driver (see e1inp_driver_register() for more info).
* \returns pointer to the new object created.
*
* The allocated object is returned with a count reference with name "ctor",
* which must be dropped in order to free the object [e1inp_line_put2(line, "ctor")].
*/
struct e1inp_line *
e1inp_line_create(uint8_t e1_nr, const char *driver_name)
{
struct e1inp_driver *driver;
struct e1inp_line *line;
int i;
line = e1inp_line_find(e1_nr);
if (line) {
LOGPIL(line, DLINP, LOGL_ERROR, "E1 Line %u already exists\n", e1_nr);
return NULL;
}
driver = e1inp_driver_find(driver_name);
if (!driver) {
LOGP(DLINP, LOGL_ERROR, "No such E1 driver '%s'\n",
driver_name);
return NULL;
}
line = talloc_zero(tall_e1inp_ctx, struct e1inp_line);
if (!line)
return NULL;
line->driver = driver;
line->num = e1_nr;
line->pcap_fd = -1;
line->keepalive_idle_timeout = E1INP_USE_DEFAULT;
line->keepalive_num_probes = E1INP_USE_DEFAULT;
line->keepalive_probe_interval = E1INP_USE_DEFAULT;
line->connect_timeout = 0;
line->rate_ctr = rate_ctr_group_alloc(line, &e1inp_ctr_g_d, line->num);
if (!line->rate_ctr) {
LOGPIL(line, DLINP, LOGL_ERROR, "Cannot allocate counter group\n");
talloc_free(line);
return NULL;
}
line->num_ts = NUM_E1_TS;
for (i = 0; i < line->num_ts; i++) {
line->ts[i].num = i+1;
line->ts[i].line = line;
}
line->use_count.talloc_object = line;
line->use_count.use_cb = e1inp_line_use_cb;
e1inp_line_get2(line, "ctor");
llist_add_tail(&line->list, &e1inp_line_list);
return line;
}
struct e1inp_line *
e1inp_line_clone(void *ctx, struct e1inp_line *line, const char *use)
{
struct e1inp_line *clone;
/* clone virtual E1 line for this new OML link. */
clone = talloc_zero(ctx, struct e1inp_line);
if (clone == NULL)
return NULL;
memcpy(clone, line, sizeof(struct e1inp_line));
if (line->name) {
clone->name = talloc_strdup(clone, line->name);
OSMO_ASSERT(clone->name);
}
if (line->sock_path) {
clone->sock_path = talloc_strdup(clone, line->sock_path);
OSMO_ASSERT(clone->sock_path);
}
/*
* Rate counters and driver data are shared between clones. These are pointers
* to dynamic memory so we use reference counting to avoid a double-free (see OS#3137).
*/
OSMO_ASSERT(line->rate_ctr);
clone->rate_ctr = talloc_reference(clone, line->rate_ctr);
if (line->driver_data)
clone->driver_data = talloc_reference(clone, line->driver_data);
clone->use_count = (struct osmo_use_count) {
.talloc_object = clone,
.use_cb = e1inp_line_use_cb,
.use_counts = {0},
};
/* initialize list so it can be safely deleted without affecting original line */
INIT_LLIST_HEAD(&clone->list);
e1inp_line_get2(clone, use); /* Clone is used internally for bfd */
return clone;
}
void e1inp_line_get(struct e1inp_line *line)
{
e1inp_line_get2(line, "unknown");
}
void e1inp_line_put(struct e1inp_line *line)
{
e1inp_line_put2(line, "unknown");
}
void
e1inp_line_bind_ops(struct e1inp_line *line, const struct e1inp_line_ops *ops)
{
line->ops = ops;
}
#if 0
struct e1inp_line *e1inp_line_find_create(uint8_t e1_nr)
{
struct e1inp_line *line;
int i;
line = e1inp_line_find(e1_nr);
if (line)
return line;
line = talloc_zero(tall_e1inp_ctx, struct e1inp_line);
if (!line)
return NULL;
line->num = e1_nr;
for (i = 0; i < NUM_E1_TS; i++) {
line->ts[i].num = i+1;
line->ts[i].line = line;
}
llist_add_tail(&line->list, &e1inp_line_list);
return line;
}
#endif
static struct e1inp_ts *e1inp_ts_get(uint8_t e1_nr, uint8_t ts_nr)
{
struct e1inp_line *e1i_line;
e1i_line = e1inp_line_find(e1_nr);
if (!e1i_line)
return NULL;
return &e1i_line->ts[ts_nr-1];
}
struct subch_mux *e1inp_get_mux(uint8_t e1_nr, uint8_t ts_nr)
{
struct e1inp_ts *e1i_ts = e1inp_ts_get(e1_nr, ts_nr);
if (!e1i_ts)
return NULL;
return &e1i_ts->trau.mux;
}
/* Signalling Link */
struct e1inp_sign_link *e1inp_lookup_sign_link(struct e1inp_ts *e1i,
uint8_t tei, uint8_t sapi)
{
struct e1inp_sign_link *link;
llist_for_each_entry(link, &e1i->sign.sign_links, list) {
if (link->sapi == sapi && link->tei == tei)
return link;
}
return NULL;
}
/* create a new signalling link in a E1 timeslot */
struct e1inp_sign_link *
e1inp_sign_link_create(struct e1inp_ts *ts, enum e1inp_sign_type type,
struct gsm_bts_trx *trx, uint8_t tei,
uint8_t sapi)
{
struct e1inp_sign_link *link;
if (ts->type != E1INP_TS_TYPE_SIGN)
return NULL;
link = talloc_zero(tall_sigl_ctx, struct e1inp_sign_link);
if (!link)
return NULL;
link->ts = ts;
link->type = type;
INIT_LLIST_HEAD(&link->tx_list);
link->trx = trx;
link->tei = tei;
link->sapi = sapi;
e1inp_line_get2(link->ts->line, "e1inp_sign_link");
llist_add_tail(&link->list, &ts->sign.sign_links);
return link;
}
void e1inp_sign_link_destroy(struct e1inp_sign_link *link)
{
struct msgb *msg;
llist_del(&link->list);
while (!llist_empty(&link->tx_list)) {
msg = msgb_dequeue(&link->tx_list);
msgb_free(msg);
}
if (link->ts->type == E1INP_TS_TYPE_SIGN)
osmo_timer_del(&link->ts->sign.tx_timer);
if (link->ts->line->driver->close)
link->ts->line->driver->close(link);
e1inp_line_put2(link->ts->line, "e1inp_sign_link");
talloc_free(link);
}
/* XXX */
/* the E1 driver tells us he has received something on a TS */
int e1inp_rx_ts(struct e1inp_ts *ts, struct msgb *msg,
uint8_t tei, uint8_t sapi)
{
struct e1inp_sign_link *link;
int ret = 0;
switch (ts->type) {
case E1INP_TS_TYPE_SIGN:
/* we only need to write a 'Fake LAPD' packet here, if
* the underlying driver hides LAPD from us. If we use
* the libosmocore LAPD implementation, it will take
* care of writing the _actual_ LAPD packet */
if (!ts->lapd)
write_pcap_packet(PCAP_INPUT, sapi, tei, msg, ts->line->pcap_fd);
/* consult the list of signalling links */
link = e1inp_lookup_sign_link(ts, tei, sapi);
if (!link) {
LOGPITS(ts, DLMI, LOGL_ERROR, "didn't find signalling link for "
"tei %d, sapi %d\n", tei, sapi);
msgb_free(msg);
return -EINVAL;
}
if (!ts->line->ops->sign_link) {
LOGPITS(ts, DLINP, LOGL_ERROR, "Fix your application, "
"no action set for signalling messages.\n");
msgb_free(msg);
return -ENOENT;
}
msg->dst = link;
ts->line->ops->sign_link(msg);
break;
case E1INP_TS_TYPE_TRAU:
ret = subch_demux_in(&ts->trau.demux, msg->l2h, msgb_l2len(msg));
msgb_free(msg);
break;
case E1INP_TS_TYPE_RAW:
ts->raw.recv_cb(ts, msg);
break;
case E1INP_TS_TYPE_HDLC:
ts->hdlc.recv_cb(ts, msg);
break;
case E1INP_TS_TYPE_I460:
osmo_i460_demux_in(&ts->i460.i460_ts, msg->l2h, msgb_l2len(msg));
msgb_free(msg);
break;
default:
ret = -EINVAL;
LOGPITS(ts, DLMI, LOGL_ERROR, "unknown TS type %u\n", ts->type);
msgb_free(msg);
break;
}
return ret;
}
/*! \brief Receive some data from the L1/HDLC into LAPD of a timeslot
* \param[in] e1i_ts E1 Timeslot data structure
* \param[in] msg Message buffer containing full LAPD message
*
* This is a wrapper around e1inp_rx_ts(), but feeding the incoming
* message first into our LAPD code. This allows a driver to read raw
* (HDLC decoded) data from the timeslot, instead of a LAPD stack
* present in any underlying driver.
*/
int e1inp_rx_ts_lapd(struct e1inp_ts *e1i_ts, struct msgb *msg)
{
unsigned int sapi, tei;
int ret = 0, error = 0;
sapi = msg->data[0] >> 2;
if ((msg->data[0] & 0x1))
tei = 0;
else
tei = msg->data[1] >> 1;
LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "<= len = %d, sapi(%d) tei(%d)\n", msg->len, sapi, tei);
ret = lapd_receive(e1i_ts->lapd, msg, &error);
if (ret < 0) {
switch(error) {
case LAPD_ERR_UNKNOWN_TEI:
/* We don't know about this TEI, probably the BSC
* lost local states (it crashed or it was stopped),
* notify the driver to see if it can do anything to
* recover the existing signalling links with the BTS.
*/
e1inp_event(e1i_ts, S_L_INP_TEI_UNKNOWN, tei, sapi);
return -EIO;
}
}
return 0;
}
void e1inp_dlsap_up(struct osmo_dlsap_prim *dp, uint8_t tei, uint8_t sapi,
void *rx_cbdata)
{
struct e1inp_ts *e1i_ts = rx_cbdata;
struct msgb *msg = dp->oph.msg;
switch (dp->oph.primitive) {
case PRIM_DL_EST:
LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "DL_EST: sapi(%d) tei(%d)\n", sapi, tei);
e1inp_event(e1i_ts, S_L_INP_TEI_UP, tei, sapi);
break;
case PRIM_DL_REL:
LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "DL_REL: sapi(%d) tei(%d)\n", sapi, tei);
e1inp_event(e1i_ts, S_L_INP_TEI_DN, tei, sapi);
break;
case PRIM_DL_DATA:
case PRIM_DL_UNIT_DATA:
if (dp->oph.operation == PRIM_OP_INDICATION) {
msg->l2h = msg->l3h;
LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "RX: %s sapi=%d tei=%d\n",
osmo_hexdump(msgb_l2(msg), msgb_l2len(msg)),
sapi, tei);
e1inp_rx_ts(e1i_ts, msg, tei, sapi);
return;
}
break;
case PRIM_MDL_ERROR:
LOGPITS(e1i_ts, DLMI, LOGL_DEBUG, "MDL_EERROR: cause(%d)\n", dp->u.error_ind.cause);
break;
default:
printf("ERROR: unknown prim\n");
break;
}
msgb_free(msg);
return;
}
#define TSX_ALLOC_SIZE 4096
/* called by driver if it wants to transmit on a given TS */
struct msgb *e1inp_tx_ts(struct e1inp_ts *e1i_ts,
struct e1inp_sign_link **sign_link)
{
struct e1inp_sign_link *link;
struct msgb *msg = NULL;
int len;
switch (e1i_ts->type) {
case E1INP_TS_TYPE_SIGN:
/* FIXME: implement this round robin */
llist_for_each_entry(link, &e1i_ts->sign.sign_links, list) {
msg = msgb_dequeue(&link->tx_list);
if (msg) {
if (sign_link)
*sign_link = link;
break;
}
}
break;
case E1INP_TS_TYPE_TRAU:
msg = msgb_alloc(TSX_ALLOC_SIZE, "TRAU_TX");
if (!msg)
return NULL;
len = subchan_mux_out(&e1i_ts->trau.mux, msg->data, 40);
if (len != 40) {
LOGPITS(e1i_ts, DLMI, LOGL_ERROR, "cannot transmit, failed to mux\n");
msgb_free(msg);
return NULL;
}
msgb_put(msg, 40);
break;
case E1INP_TS_TYPE_RAW:
/* Get msgb from tx_queue */
msg = msgb_dequeue(&e1i_ts->raw.tx_queue);
break;
case E1INP_TS_TYPE_HDLC:
/* Get msgb from tx_queue */
msg = msgb_dequeue(&e1i_ts->hdlc.tx_queue);
break;
case E1INP_TS_TYPE_I460:
msg = msgb_alloc(TSX_ALLOC_SIZE, "I460_TX");
if (!msg)
return NULL;
len = osmo_i460_mux_out(&e1i_ts->i460.i460_ts, msg->data, 160);
msgb_put(msg, len);
break;
default:
LOGPITS(e1i_ts, DLMI, LOGL_ERROR, "unsupported E1 TS type %u\n", e1i_ts->type);
return NULL;
}
return msg;
}
int e1inp_int_snd_event(struct e1inp_ts *ts, struct e1inp_sign_link *link, int evt)
{
struct input_signal_data isd;
isd.line = ts->line;
isd.ts_nr = ts->num;
isd.link_type = link->type;
isd.trx = link->trx;
isd.tei = link->tei;
isd.sapi = link->sapi;
/* report further upwards */
osmo_signal_dispatch(SS_L_INPUT, evt, &isd);
return 0;
}
/* called by driver in case some kind of link state event */
int e1inp_event(struct e1inp_ts *ts, int evt, uint8_t tei, uint8_t sapi)
{
struct e1inp_sign_link *link;
link = e1inp_lookup_sign_link(ts, tei, sapi);
if (!link)
return -EINVAL;
return e1inp_int_snd_event(ts, link, evt);
}
/* register a driver with the E1 core */
int e1inp_driver_register(struct e1inp_driver *drv)
{
llist_add_tail(&drv->list, &e1inp_driver_list);
return 0;
}
struct e1inp_driver *e1inp_driver_find(const char *name)
{
struct e1inp_driver *drv;
llist_for_each_entry(drv, &e1inp_driver_list, list) {
if (!strcasecmp(name, drv->name))
return drv;
}
return NULL;
}
int e1inp_line_update(struct e1inp_line *line)
{
struct input_signal_data isd;
int i, rc;
if (line->driver && line->ops && line->driver->line_update) {
rc = line->driver->line_update(line);
} else
rc = 0;
/* Set the PCAP file descriptor for all timeslots that have
* software LAPD instances, to ensure the osmo_lapd_pcap code is
* used to write PCAP files (if requested) */
for (i = 0; i < ARRAY_SIZE(line->ts); i++) {
struct e1inp_ts *e1i_ts = &line->ts[i];
if (e1i_ts->lapd)
e1i_ts->lapd->pcap_fd = line->pcap_fd;
}
/* Send a signal to anyone who is interested in new lines being
* configured */
memset(&isd, 0, sizeof(isd));
isd.line = line;
osmo_signal_dispatch(SS_L_INPUT, S_L_INP_LINE_INIT, &isd);
return rc;
}
static int e1i_sig_cb(unsigned int subsys, unsigned int signal,
void *handler_data, void *signal_data)
{
struct e1inp_line *line;
if (subsys != SS_L_GLOBAL ||
signal != S_L_GLOBAL_SHUTDOWN)
return 0;
llist_for_each_entry(line, &e1inp_line_list, list) {
if (line->pcap_fd >=0)
close(line->pcap_fd);
line->pcap_fd = -1;
}
return 0;
}
const struct value_string e1inp_signal_names[] = {
{ S_L_INP_NONE, "NONE" },
{ S_L_INP_TEI_UP, "TEI-UP" },
{ S_L_INP_TEI_DN, "TEI-DOWN" },
{ S_L_INP_TEI_UNKNOWN, "TEI-UNKNOWN" },
{ S_L_INP_LINE_INIT, "LINE-INIT" },
{ S_L_INP_LINE_ALARM, "LINE-ALARM" },
{ S_L_INP_LINE_NOALARM, "LINE-NOALARM" },
{ S_L_INP_LINE_LOS, "LINE-LOS" },
{ S_L_INP_LINE_NOLOS, "LINE-NOLOS" },
{ S_L_INP_LINE_AIS, "LINE-AIS" },
{ S_L_INP_LINE_NOAIS, "LINE-NOAIS" },
{ S_L_INP_LINE_RAI, "LINE-RAI" },
{ S_L_INP_LINE_NORAI, "LINE-NORAI" },
{ S_L_INP_LINE_SLIP_RX, "LINE-SLIP-RX" },
{ S_L_INP_LINE_SLIP_TX, "LINE-SLIP-TX" },
{ S_L_INP_LINE_SA_BITS, "LINE-SA-BITS" },
{ 0, NULL }
};
void e1inp_misdn_init(void);
void e1inp_dahdi_init(void);
void e1inp_e1d_init(void);
void e1inp_ipaccess_init(void);
void e1inp_rs232_init(void);
void e1inp_unixsocket_init(void);
void e1inp_init(void)
{
tall_e1inp_ctx = talloc_named_const(libosmo_abis_ctx, 1, "e1inp");
tall_sigl_ctx = talloc_named_const(tall_e1inp_ctx, 1,
"e1inp_sign_link");
osmo_signal_register_handler(SS_L_GLOBAL, e1i_sig_cb, NULL);
e1inp_misdn_init();
#ifdef HAVE_DAHDI_USER_H
e1inp_dahdi_init();
#endif
#ifdef HAVE_E1D
e1inp_e1d_init();
#endif
e1inp_ipaccess_init();
e1inp_rs232_init();
e1inp_unixsocket_init();
}
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