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osmo-bsc/openbsc/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
*
* 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 <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <time.h>
#include <sys/fcntl.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <arpa/inet.h>
#include <mISDNif.h>
//#define AF_COMPATIBILITY_FUNC
//#include <compat_af_isdn.h>
#ifndef AF_ISDN
#define AF_ISDN 34
#define PF_ISDN AF_ISDN
#endif
#include <osmocore/select.h>
#include <osmocore/msgb.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/e1_input.h>
#include <openbsc/abis_nm.h>
#include <openbsc/abis_rsl.h>
#include <osmocore/linuxlist.h>
#include <openbsc/subchan_demux.h>
#include <openbsc/trau_frame.h>
#include <openbsc/trau_mux.h>
#include <osmocore/talloc.h>
#include <openbsc/signal.h>
#include <openbsc/misdn.h>
#define NUM_E1_TS 32
/* 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;
/* to be implemented, e.g. by bsc_hack.c */
void input_event(int event, enum e1inp_sign_type type, struct gsm_bts_trx *trx);
/*
* 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 {
u_int32_t magic_number;
u_int16_t version_major;
u_int16_t version_minor;
int32_t thiszone;
u_int32_t sigfigs;
u_int32_t snaplen;
u_int32_t network;
} __attribute__((packed));
struct pcaprec_hdr {
u_int32_t ts_sec;
u_int32_t ts_usec;
u_int32_t incl_len;
u_int32_t orig_len;
} __attribute__((packed));
struct fake_linux_lapd_header {
u_int16_t pkttype;
u_int16_t hatype;
u_int16_t halen;
u_int64_t addr;
int16_t protocol;
} __attribute__((packed));
struct lapd_header {
u_int8_t ea1 : 1;
u_int8_t cr : 1;
u_int8_t sapi : 6;
u_int8_t ea2 : 1;
u_int8_t tei : 7;
u_int8_t control_foo; /* fake UM's ... */
} __attribute__((packed));
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->hatype == 2, hatype_offset);
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->halen == 4, halen_offset);
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->addr == 6, addr_offset);
static_assert((int)&((struct fake_linux_lapd_header*)NULL)->protocol == 14, proto_offset);
static_assert(sizeof(struct fake_linux_lapd_header) == 16, lapd_header_size);
static int pcap_fd = -1;
void e1_set_pcap_fd(int fd)
{
int ret;
struct pcap_hdr header = {
.magic_number = 0xa1b2c3d4,
.version_major = 2,
.version_minor = 4,
.thiszone = 0,
.sigfigs = 0,
.snaplen = 65535,
.network = DLT_LINUX_LAPD,
};
pcap_fd = fd;
ret = write(pcap_fd, &header, sizeof(header));
}
/* This currently only works for the D-Channel */
static void write_pcap_packet(int direction, int sapi, int tei,
struct msgb *msg) {
if (pcap_fd < 0)
return;
int ret;
time_t cur_time;
struct tm *tm;
int mi_head = (direction==PCAP_INPUT) ? MISDN_HEADER_LEN : 0;
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 = msg->len + sizeof(struct fake_linux_lapd_header)
+ sizeof(struct lapd_header)
- mi_head,
.orig_len = msg->len + sizeof(struct fake_linux_lapd_header)
+ sizeof(struct lapd_header)
- mi_head,
};
cur_time = time(NULL);
tm = localtime(&cur_time);
payload_header.ts_sec = mktime(tm);
ret = write(pcap_fd, &payload_header, sizeof(payload_header));
ret = write(pcap_fd, &header, sizeof(header));
ret = write(pcap_fd, &lapd_header, sizeof(lapd_header));
ret = write(pcap_fd, msg->data + mi_head,
msg->len - mi_head);
}
static const char *sign_types[] = {
[E1INP_SIGN_NONE] = "None",
[E1INP_SIGN_OML] = "OML",
[E1INP_SIGN_RSL] = "RSL",
};
const char *e1inp_signtype_name(enum e1inp_sign_type tp)
{
if (tp >= ARRAY_SIZE(sign_types))
return "undefined";
return sign_types[tp];
}
static const char *ts_types[] = {
[E1INP_TS_TYPE_NONE] = "None",
[E1INP_TS_TYPE_SIGN] = "Signalling",
[E1INP_TS_TYPE_TRAU] = "TRAU",
};
const char *e1inp_tstype_name(enum e1inp_ts_type tp)
{
if (tp >= ARRAY_SIZE(ts_types))
return "undefined";
return ts_types[tp];
}
/* callback when a TRAU frame was received */
static int subch_cb(struct subch_demux *dmx, int ch, u_int8_t *data, int len,
void *_priv)
{
struct e1inp_ts *e1i_ts = _priv;
struct gsm_e1_subslot src_ss;
src_ss.e1_nr = e1i_ts->line->num;
src_ss.e1_ts = e1i_ts->num;
src_ss.e1_ts_ss = ch;
return trau_mux_input(&src_ss, data, len);
}
int abis_rsl_sendmsg(struct msgb *msg)
{
struct e1inp_sign_link *sign_link;
struct e1inp_driver *e1inp_driver;
struct e1inp_ts *e1i_ts;
msg->l2h = msg->data;
if (!msg->trx) {
LOGP(DRSL, LOGL_ERROR, "rsl_sendmsg: msg->trx == NULL: %s\n",
hexdump(msg->data, msg->len));
talloc_free(msg);
return -EINVAL;
} else if (!msg->trx->rsl_link) {
LOGP(DRSL, LOGL_ERROR, "rsl_sendmsg: msg->trx->rsl_link == NULL: %s\n",
hexdump(msg->data, msg->len));
talloc_free(msg);
return -EIO;
}
sign_link = msg->trx->rsl_link;
e1i_ts = sign_link->ts;
if (!bsc_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);
/* dump it */
write_pcap_packet(PCAP_OUTPUT, sign_link->sapi, sign_link->tei, msg);
return 0;
}
int _abis_nm_sendmsg(struct msgb *msg)
{
struct e1inp_sign_link *sign_link;
struct e1inp_driver *e1inp_driver;
struct e1inp_ts *e1i_ts;
msg->l2h = msg->data;
if (!msg->trx || !msg->trx->bts || !msg->trx->bts->oml_link) {
LOGP(DRSL, LOGL_ERROR, "nm_sendmsg: msg->trx == NULL\n");
return -EINVAL;
}
sign_link = msg->trx->bts->oml_link;
e1i_ts = sign_link->ts;
if (!bsc_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);
/* dump it */
write_pcap_packet(PCAP_OUTPUT, sign_link->sapi, sign_link->tei, msg);
return 0;
}
/* Timeslot */
/* configure and initialize one e1inp_ts */
int e1inp_ts_config(struct e1inp_ts *ts, struct e1inp_line *line,
enum e1inp_ts_type type)
{
if (ts->type == type && ts->line && line)
return 0;
ts->type = type;
ts->line = line;
switch (type) {
case E1INP_TS_TYPE_SIGN:
INIT_LLIST_HEAD(&ts->sign.sign_links);
break;
case E1INP_TS_TYPE_TRAU:
subchan_mux_init(&ts->trau.mux);
ts->trau.demux.out_cb = subch_cb;
ts->trau.demux.data = ts;
subch_demux_init(&ts->trau.demux);
break;
default:
LOGP(DMI, LOGL_ERROR, "unsupported E1 timeslot type %u\n",
ts->type);
return -EINVAL;
}
return 0;
}
static struct e1inp_line *e1inp_line_get(u_int8_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;
}
struct e1inp_line *e1inp_line_get_create(u_int8_t e1_nr)
{
struct e1inp_line *line;
int i;
line = e1inp_line_get(e1_nr);
if (line)
return line;
line = talloc_zero(tall_bsc_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;
}
static struct e1inp_ts *e1inp_ts_get(u_int8_t e1_nr, u_int8_t ts_nr)
{
struct e1inp_line *e1i_line;
e1i_line = e1inp_line_get(e1_nr);
if (!e1i_line)
return NULL;
return &e1i_line->ts[ts_nr-1];
}
struct subch_mux *e1inp_get_mux(u_int8_t e1_nr, u_int8_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,
u_int8_t tei, u_int8_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, u_int8_t tei,
u_int8_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;
llist_add_tail(&link->list, &ts->sign.sign_links);
return link;
}
void e1inp_sign_link_destroy(struct e1inp_sign_link *link)
{
llist_del(&link->list);
talloc_free(link);
}
/* the E1 driver tells us he has received something on a TS */
int e1inp_rx_ts(struct e1inp_ts *ts, struct msgb *msg,
u_int8_t tei, u_int8_t sapi)
{
struct e1inp_sign_link *link;
int ret;
switch (ts->type) {
case E1INP_TS_TYPE_SIGN:
/* consult the list of signalling links */
write_pcap_packet(PCAP_INPUT, sapi, tei, msg);
link = e1inp_lookup_sign_link(ts, tei, sapi);
if (!link) {
LOGP(DMI, LOGL_ERROR, "didn't find signalling link for "
"tei %d, sapi %d\n", tei, sapi);
return -EINVAL;
}
debug_set_context(BSC_CTX_BTS, link->trx->bts);
switch (link->type) {
case E1INP_SIGN_OML:
msg->trx = link->trx;
ret = abis_nm_rcvmsg(msg);
break;
case E1INP_SIGN_RSL:
msg->trx = link->trx;
ret = abis_rsl_rcvmsg(msg);
break;
default:
ret = -EINVAL;
LOGP(DMI, LOGL_ERROR, "unknown link type %u\n", link->type);
break;
}
break;
case E1INP_TS_TYPE_TRAU:
ret = subch_demux_in(&ts->trau.demux, msg->l2h, msgb_l2len(msg));
break;
default:
ret = -EINVAL;
LOGP(DMI, LOGL_ERROR, "unknown TS type %u\n", ts->type);
break;
}
return ret;
}
#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);
msgb_put(msg, 40);
break;
default:
LOGP(DMI, LOGL_ERROR, "unsupported E1 TS type %u\n", e1i_ts->type);
return NULL;
}
return msg;
}
/* called by driver in case some kind of link state event */
int e1inp_event(struct e1inp_ts *ts, int evt, u_int8_t tei, u_int8_t sapi)
{
struct e1inp_sign_link *link;
link = e1inp_lookup_sign_link(ts, tei, sapi);
if (!link)
return -EINVAL;
/* FIXME: report further upwards */
input_event(evt, link->type, link->trx);
return 0;
}
/* 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;
}
int e1inp_line_update(struct e1inp_line *line)
{
return mi_e1_line_update(line);
}
static int e1i_sig_cb(unsigned int subsys, unsigned int signal,
void *handler_data, void *signal_data)
{
if (subsys != SS_GLOBAL ||
signal != S_GLOBAL_SHUTDOWN)
return 0;
if (pcap_fd) {
close(pcap_fd);
pcap_fd = -1;
}
return 0;
}
static __attribute__((constructor)) void on_dso_load_e1_inp(void)
{
tall_sigl_ctx = talloc_named_const(tall_bsc_ctx, 1,
"e1inp_sign_link");
register_signal_handler(SS_GLOBAL, e1i_sig_cb, NULL);
}
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