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osmo-bsc/openbsc/src/input/dahdi.c

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/* OpenBSC Abis input driver for DAHDI */
/* (C) 2008-2009 by Harald Welte <laforge@gnumonks.org>
* (C) 2009 by Holger Hans Peter Freyther <zecke@selfish.org>
* (C) 2010 by Digium and Matthew Fredrickson <creslin@digium.com>
*
* 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 <openbsc/select.h>
#include <openbsc/msgb.h>
#include <openbsc/debug.h>
#include <openbsc/gsm_data.h>
#include <openbsc/abis_nm.h>
#include <openbsc/abis_rsl.h>
#include <openbsc/subchan_demux.h>
#include <openbsc/e1_input.h>
#include <openbsc/talloc.h>
#include "lapd.h"
#define TS1_ALLOC_SIZE 300
struct prim_name {
unsigned int prim;
const char *name;
};
const struct prim_name prim_names[] = {
{ PH_CONTROL_IND, "PH_CONTROL_IND" },
{ PH_DATA_IND, "PH_DATA_IND" },
{ PH_DATA_CNF, "PH_DATA_CNF" },
{ PH_ACTIVATE_IND, "PH_ACTIVATE_IND" },
{ DL_ESTABLISH_IND, "DL_ESTABLISH_IND" },
{ DL_ESTABLISH_CNF, "DL_ESTABLISH_CNF" },
{ DL_RELEASE_IND, "DL_RELEASE_IND" },
{ DL_RELEASE_CNF, "DL_RELEASE_CNF" },
{ DL_DATA_IND, "DL_DATA_IND" },
{ DL_UNITDATA_IND, "DL_UNITDATA_IND" },
{ DL_INFORMATION_IND, "DL_INFORMATION_IND" },
{ MPH_ACTIVATE_IND, "MPH_ACTIVATE_IND" },
{ MPH_DEACTIVATE_IND, "MPH_DEACTIVATE_IND" },
};
const char *get_prim_name(unsigned int prim)
{
int i;
for (i = 0; i < ARRAY_SIZE(prim_names); i++) {
if (prim_names[i].prim == prim)
return prim_names[i].name;
}
return "UNKNOWN";
}
static int handle_ts1_read(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
struct e1inp_sign_link *link;
struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "DAHDI TS1");
struct sockaddr_mISDN l2addr;
struct mISDNhead ah;
struct mISDNhead *hh = &ah;
int ret;
if (!msg)
return -ENOMEM;
hh = (struct mISDNhead *) msg->data;
ret = read(bfd->fd, &msg->data, TS1_ALLOC_SIZE - 16);
if (ret < 0) {
perror("read ");
}
msgb_put(msg, ret);
if (ret <= 3) {
perror("read ");
}
DEBUGP(DMI, "<= len = %d, prim(0x%x) id(0x%x): %s\n",
ret, hh->prim, hh->id, get_prim_name(hh->prim));
int ilen;
lapd_mph_type prim;
uint8_t *idata = lapd_receive(msg->data, msg->len, &ilen, &prim, bfd);
switch (prim) {
case 0: break;
case LAPD_MPH_ACTIVATE_IND: hh->prim = MPH_ACTIVATE_IND; break;
case LAPD_MPH_DEACTIVATE_IND: hh->prim = MPH_DEACTIVATE_IND; break;
case LAPD_DL_DATA_IND: hh->prim = DL_DATA_IND; break;
default: printf("ERROR: unknown prim\n");
};
int pass_on = (prim != 0);
if (!pass_on) {
return 0;
};
l2addr.sapi = msg->data[0] >> 2;
l2addr.tei = msg->data[1] >> 1;
msgb_pull(msg, 2);
#if 0
switch (hh->prim) {
case DL_INFORMATION_IND:
DEBUGP(DMI, "got DL_INFORMATION_IND\n");
struct sockaddr_mISDN *sa = NULL;
char *lstr = "UNKN";
switch (l2addr.tei) {
case TEI_OML:
sa = &e1h->omladdr;
lstr = "OML";
break;
case TEI_RSL:
sa = &e1h->l2addr;
lstr = "RSL";
break;
default:
break;
}
if (sa) {
DEBUGP(DMI, "%s use channel(%d) sapi(%d) tei(%d) for now\n",
lstr, l2addr.channel, l2addr.sapi, l2addr.tei);
memcpy(sa, &l2addr, sizeof(l2addr));
}
break;
case DL_ESTABLISH_IND:
DEBUGP(DMI, "got DL_ESTABLISH_IND\n");
break;
case DL_ESTABLISH_CNF:
DEBUGP(DMI, "got DL_ESTABLISH_CNF\n");
break;
case DL_RELEASE_IND:
DEBUGP(DMI, "got DL_RELEASE_IND: E1 Layer 1 disappeared?\n");
break;
#if 0
case MPH_ACTIVATE_IND:
DEBUGP(DMI, "got MPH_ACTIVATE_IND\n");
printf("tei %d, sapi %d\n", l2addr.tei, l2addr.sapi);
if (l2addr.tei == TEI_OML && l2addr.sapi == SAPI_OML)
e1h->cb(EVT_E1_OML_UP, e1h->bts);
else if (l2addr.tei == TEI_RSL && l2addr.sapi == SAPI_RSL)
e1h->cb(EVT_E1_RSL_UP, e1h->bts);
break;
case MPH_DEACTIVATE_IND:
DEBUGP(DMI, "got MPH_DEACTIVATE_IND: TEI link closed?\n");
if (l2addr.tei == TEI_OML && l2addr.sapi == SAPI_OML)
e1h->cb(EVT_E1_OML_DN, e1h->bts);
else if (l2addr.tei == TEI_RSL && l2addr.sapi == SAPI_RSL)
e1h->cb(EVT_E1_RSL_DN, e1h->bts);
break;
#endif
case DL_DATA_IND:
DEBUGP(DMI, "got DL_DATA_IND\n");
ret = msg->len;
msg->l2h = msg->data + 2;// + MISDN_HEADER_LEN;
#if 0
if (debug_mask & DMI) {
fprintf(stdout, "RX: ");
hexdump(msgb_l2(msg), ret - (msg->l2h - msg->data));// - MISDN_HEADER_LEN);
}
#endif
switch (l2addr.tei) {
case TEI_OML:
ret = abis_nm_rcvmsg(msg);
break;
case TEI_RSL:
ret = abis_rsl_rcvmsg(msg);
break;
default:
fprintf(stderr, "DATA_IND for unknown TEI\n");
break;
}
break;
default:
DEBUGP(DMI, "got unexpected 0x%x prim\n", hh->prim);
break;
}
#endif
#if 1
switch (hh->prim) {
case DL_INFORMATION_IND:
/* mISDN tells us which channel number is allocated for this
* tuple of (SAPI, TEI). */
DEBUGP(DMI, "DL_INFORMATION_IND: use channel(%d) sapi(%d) tei(%d) for now\n",
l2addr.channel, l2addr.sapi, l2addr.tei);
link = e1inp_lookup_sign_link(e1i_ts, l2addr.tei, l2addr.sapi);
if (!link) {
DEBUGPC(DMI, "mISDN message for unknown sign_link\n");
msgb_free(msg);
return -EINVAL;
}
/* save the channel number in the driver private struct */
link->driver.misdn.channel = l2addr.channel;
break;
case DL_ESTABLISH_IND:
DEBUGP(DMI, "DL_ESTABLISH_IND: channel(%d) sapi(%d) tei(%d)\n",
l2addr.channel, l2addr.sapi, l2addr.tei);
ret = e1inp_event(e1i_ts, EVT_E1_TEI_UP, l2addr.tei, l2addr.sapi);
break;
case DL_RELEASE_IND:
DEBUGP(DMI, "DL_RELEASE_IND: channel(%d) sapi(%d) tei(%d)\n",
l2addr.channel, l2addr.sapi, l2addr.tei);
ret = e1inp_event(e1i_ts, EVT_E1_TEI_DN, l2addr.tei, l2addr.sapi);
break;
case DL_DATA_IND:
case DL_UNITDATA_IND:
msg->l2h = msg->data + MISDN_HEADER_LEN;
DEBUGP(DMI, "RX: %s\n", hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN));
ret = e1inp_rx_ts(e1i_ts, msg, l2addr.tei, l2addr.sapi);
break;
case PH_ACTIVATE_IND:
DEBUGP(DMI, "PH_ACTIVATE_IND: channel(%d) sapi(%d) tei(%d)\n",
l2addr.channel, l2addr.sapi, l2addr.tei);
break;
case PH_DEACTIVATE_IND:
DEBUGP(DMI, "PH_DEACTIVATE_IND: channel(%d) sapi(%d) tei(%d)\n",
l2addr.channel, l2addr.sapi, l2addr.tei);
break;
default:
break;
}
#endif
return ret;
}
static int ts_want_write(struct e1inp_ts *e1i_ts)
{
/* We never include the mISDN B-Channel FD into the
* writeset, since it doesn't support poll() based
* write flow control */
if (e1i_ts->type == E1INP_TS_TYPE_TRAU)
return 0;
e1i_ts->driver.misdn.fd.when |= BSC_FD_WRITE;
return 0;
}
static void timeout_ts1_write(void *data)
{
struct e1inp_ts *e1i_ts = (struct e1inp_ts *)data;
/* trigger write of ts1, due to tx delay timer */
ts_want_write(e1i_ts);
}
static int handle_ts1_write(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
struct e1inp_sign_link *sign_link;
struct msgb *msg;
//u_int8_t *l2_data;
int ret;
//int no_oml = 0;
bfd->when &= ~BSC_FD_WRITE;
/* get the next msg for this timeslot */
msg = e1inp_tx_ts(e1i_ts, &sign_link);
if (!msg) {
/* no message after tx delay timer */
return 0;
}
#if 0
DEBUGP(DMI, "TX TEI(%d) SAPI(%d): %s\n", sign_link->tei,
sign_link->sapi, hexdump(l2_data, msg->len - MISDN_HEADER_LEN));
#endif
lapd_transmit(sign_link->tei, msg->data, msg->len, bfd);
ret = write(bfd->fd, msg->data, msg->len + 2);
if (ret < 0)
fprintf(stderr, "%s write failed %d\n", __func__, ret);
msgb_free(msg);
/* set tx delay timer for next event */
e1i_ts->sign.tx_timer.cb = timeout_ts1_write;
e1i_ts->sign.tx_timer.data = e1i_ts;
bsc_schedule_timer(&e1i_ts->sign.tx_timer, 0, 50000);
return ret;
}
#define BCHAN_TX_GRAN 160
/* write to a B channel TS */
static int handle_tsX_write(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
struct mISDNhead *hh;
u_int8_t tx_buf[BCHAN_TX_GRAN + sizeof(*hh)];
struct subch_mux *mx = &e1i_ts->trau.mux;
int ret;
hh = (struct mISDNhead *) tx_buf;
hh->prim = PH_DATA_REQ;
subchan_mux_out(mx, tx_buf+sizeof(*hh), BCHAN_TX_GRAN);
DEBUGP(DMIB, "BCHAN TX: %s\n",
hexdump(tx_buf+sizeof(*hh), BCHAN_TX_GRAN));
ret = send(bfd->fd, tx_buf, sizeof(*hh) + BCHAN_TX_GRAN, 0);
if (ret < sizeof(*hh) + BCHAN_TX_GRAN)
DEBUGP(DMIB, "send returns %d instead of %lu\n", ret,
sizeof(*hh) + BCHAN_TX_GRAN);
return ret;
}
#define TSX_ALLOC_SIZE 4096
/* FIXME: read from a B channel TS */
static int handle_tsX_read(struct bsc_fd *bfd)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
struct e1inp_ts *e1i_ts = &line->ts[ts_nr-1];
struct msgb *msg = msgb_alloc(TSX_ALLOC_SIZE, "DAHDI TSx");
struct mISDNhead ah;
struct mISDNhead *hh = &ah;
int ret;
if (!msg)
return -ENOMEM;
hh = (struct mISDNhead *) msg->data;
ret = read(bfd->fd, msg->data, TSX_ALLOC_SIZE);
if (ret < 0) {
fprintf(stderr, "read error %s\n", strerror(errno));
return ret;
}
msgb_put(msg, ret - 2);
if (hh->prim != PH_CONTROL_IND)
DEBUGP(DMIB, "<= BCHAN len = %d, prim(0x%x) id(0x%x): %s\n",
ret, hh->prim, hh->id, get_prim_name(hh->prim));
switch (hh->prim) {
case PH_DATA_IND:
msg->l2h = msg->data + MISDN_HEADER_LEN;
DEBUGP(DMIB, "BCHAN RX: %s\n",
hexdump(msgb_l2(msg), ret - MISDN_HEADER_LEN));
ret = e1inp_rx_ts(e1i_ts, msg, 0, 0);
break;
case PH_ACTIVATE_IND:
case PH_DATA_CNF:
/* physical layer indicates that data has been sent,
* we thus can send some more data */
ret = handle_tsX_write(bfd);
default:
break;
}
/* FIXME: why do we free signalling msgs in the caller, and trau not? */
msgb_free(msg);
return ret;
}
/* callback from select.c in case one of the fd's can be read/written */
static int dahdi_fd_cb(struct bsc_fd *bfd, unsigned int what)
{
struct e1inp_line *line = bfd->data;
unsigned int ts_nr = bfd->priv_nr;
unsigned int idx = ts_nr-1;
struct e1inp_ts *e1i_ts = &line->ts[idx];
int rc = 0;
switch (e1i_ts->type) {
case E1INP_TS_TYPE_SIGN:
if (what & BSC_FD_READ)
rc = handle_ts1_read(bfd);
if (what & BSC_FD_WRITE)
rc = handle_ts1_write(bfd);
break;
case E1INP_TS_TYPE_TRAU:
if (what & BSC_FD_READ)
rc = handle_tsX_read(bfd);
/* We never include the mISDN B-Channel FD into the
* writeset, since it doesn't support poll() based
* write flow control */
break;
default:
fprintf(stderr, "unknown E1 TS type %u\n", e1i_ts->type);
break;
}
return rc;
}
#if 0
static int activate_bchan(struct e1inp_line *line, int ts, int act)
{
struct mISDNhead hh;
int ret;
unsigned int idx = ts-1;
struct e1inp_ts *e1i_ts = &line->ts[idx];
struct bsc_fd *bfd = &e1i_ts->driver.misdn.fd;
fprintf(stdout, "activate bchan\n");
if (act)
hh.prim = PH_ACTIVATE_REQ;
else
hh.prim = PH_DEACTIVATE_REQ;
hh.id = MISDN_ID_ANY;
ret = sendto(bfd->fd, &hh, sizeof(hh), 0, NULL, 0);
if (ret < 0) {
fprintf(stdout, "could not send ACTIVATE_RQ %s\n",
strerror(errno));
}
return ret;
}
#endif
struct e1inp_driver dahdi_driver = {
.name = "DAHDI",
.want_write = ts_want_write,
};
static int mi_e1_setup(struct e1inp_line *line, int release_l2)
{
int ts, ret;
/* TS0 is CRC4, don't need any fd for it */
for (ts = 1; ts < NUM_E1_TS; ts++) {
unsigned int idx = ts-1;
char openstr[128];
struct e1inp_ts *e1i_ts = &line->ts[idx];
struct bsc_fd *bfd = &e1i_ts->driver.misdn.fd;
bfd->data = line;
bfd->priv_nr = ts;
bfd->cb = dahdi_fd_cb;
snprintf(openstr, sizeof(openstr), "/dev/dahdi/%d", ts);
switch (e1i_ts->type) {
case E1INP_TS_TYPE_NONE:
continue;
break;
case E1INP_TS_TYPE_SIGN:
bfd->fd = open(openstr, O_RDWR);
bfd->when = BSC_FD_READ;
break;
case E1INP_TS_TYPE_TRAU:
bfd->fd = open(openstr, O_RDWR);
/* We never include the mISDN B-Channel FD into the
* writeset, since it doesn't support poll() based
* write flow control */
bfd->when = BSC_FD_READ;
break;
}
if (bfd->fd < 0) {
fprintf(stderr, "%s could not open %s %s\n",
__func__, openstr, strerror(errno));
return bfd->fd;
}
ret = bsc_register_fd(bfd);
if (ret < 0) {
fprintf(stderr, "could not register FD: %s\n",
strerror(ret));
return ret;
}
}
return 0;
}
int mi_e1_line_update(struct e1inp_line *line)
{
struct mISDN_devinfo devinfo;
//int sk, ret, cnt;
int ret;
if (!line->driver) {
/* this must be the first update */
line->driver = &dahdi_driver;
} else {
/* this is a subsequent update */
/* FIXME: first close all sockets */
fprintf(stderr, "incremental line updates not supported yet\n");
return 0;
}
if (line->driver != &dahdi_driver)
return -EINVAL;
#if 0
/* open the ISDN card device */
sk = socket(PF_ISDN, SOCK_RAW, ISDN_P_BASE);
if (sk < 0) {
fprintf(stderr, "%s could not open socket %s\n",
__func__, strerror(errno));
return sk;
}
ret = ioctl(sk, IMGETCOUNT, &cnt);
if (ret) {
fprintf(stderr, "%s error getting interf count: %s\n",
__func__, strerror(errno));
close(sk);
return -ENODEV;
}
//DEBUGP(DMI,"%d device%s found\n", cnt, (cnt==1)?"":"s");
printf("%d device%s found\n", cnt, (cnt==1)?"":"s");
#if 1
devinfo.id = line->num;
ret = ioctl(sk, IMGETDEVINFO, &devinfo);
if (ret < 0) {
fprintf(stdout, "error getting info for device %d: %s\n",
line->num, strerror(errno));
return -ENODEV;
}
fprintf(stdout, " id: %d\n", devinfo.id);
fprintf(stdout, " Dprotocols: %08x\n", devinfo.Dprotocols);
fprintf(stdout, " Bprotocols: %08x\n", devinfo.Bprotocols);
fprintf(stdout, " protocol: %d\n", devinfo.protocol);
fprintf(stdout, " nrbchan: %d\n", devinfo.nrbchan);
fprintf(stdout, " name: %s\n", devinfo.name);
#endif
if (!(devinfo.Dprotocols & (1 << ISDN_P_NT_E1))) {
fprintf(stderr, "error: card is not of type E1 (NT-mode)\n");
return -EINVAL;
}
#endif
ret = mi_e1_setup(line, 1);
if (ret)
return ret;
return 0;
}
static __attribute__((constructor)) void on_dso_load_sms(void)
{
/* register the driver with the core */
e1inp_driver_register(&dahdi_driver);
}
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