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osmo-msc/openbsc/src/input/ipaccess.c

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/* OpenBSC Abis input driver for ip.access */
/* (C) 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 <osmocore/select.h>
#include <osmocore/tlv.h>
#include <osmocore/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/ipaccess.h>
#include <osmocore/talloc.h>
/* data structure for one E1 interface with A-bis */
struct ia_e1_handle {
struct bsc_fd listen_fd;
struct bsc_fd rsl_listen_fd;
struct gsm_network *gsmnet;
};
static struct ia_e1_handle *e1h;
#define TS1_ALLOC_SIZE 300
static const u_int8_t pong[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_PONG };
static const u_int8_t id_ack[] = { 0, 1, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_ACK };
static const u_int8_t id_req[] = { 0, 17, IPAC_PROTO_IPACCESS, IPAC_MSGT_ID_GET,
0x01, IPAC_IDTAG_UNIT,
0x01, IPAC_IDTAG_MACADDR,
0x01, IPAC_IDTAG_LOCATION1,
0x01, IPAC_IDTAG_LOCATION2,
0x01, IPAC_IDTAG_EQUIPVERS,
0x01, IPAC_IDTAG_SWVERSION,
0x01, IPAC_IDTAG_UNITNAME,
0x01, IPAC_IDTAG_SERNR,
};
static const char *idtag_names[] = {
[IPAC_IDTAG_SERNR] = "Serial_Number",
[IPAC_IDTAG_UNITNAME] = "Unit_Name",
[IPAC_IDTAG_LOCATION1] = "Location_1",
[IPAC_IDTAG_LOCATION2] = "Location_2",
[IPAC_IDTAG_EQUIPVERS] = "Equipment_Version",
[IPAC_IDTAG_SWVERSION] = "Software_Version",
[IPAC_IDTAG_IPADDR] = "IP_Address",
[IPAC_IDTAG_MACADDR] = "MAC_Address",
[IPAC_IDTAG_UNIT] = "Unit_ID",
};
static const char *ipac_idtag_name(int tag)
{
if (tag >= ARRAY_SIZE(idtag_names))
return "unknown";
return idtag_names[tag];
}
int ipaccess_idtag_parse(struct tlv_parsed *dec, unsigned char *buf, int len)
{
u_int8_t t_len;
u_int8_t t_tag;
u_int8_t *cur = buf;
while (cur < buf + len) {
t_len = *cur++;
t_tag = *cur++;
DEBUGPC(DMI, "%s='%s' ", ipac_idtag_name(t_tag), cur);
dec->lv[t_tag].len = t_len;
dec->lv[t_tag].val = cur;
cur += t_len;
}
return 0;
}
struct gsm_bts *find_bts_by_unitid(struct gsm_network *net,
u_int16_t site_id, u_int16_t bts_id)
{
struct gsm_bts *bts;
llist_for_each_entry(bts, &net->bts_list, list) {
if (!is_ipaccess_bts(bts))
continue;
if (bts->ip_access.site_id == site_id &&
bts->ip_access.bts_id == bts_id)
return bts;
}
return NULL;
}
static int parse_unitid(const char *str, u_int16_t *site_id, u_int16_t *bts_id,
u_int16_t *trx_id)
{
unsigned long ul;
char *endptr;
const char *nptr;
nptr = str;
ul = strtoul(nptr, &endptr, 10);
if (endptr <= nptr)
return -EINVAL;
if (site_id)
*site_id = ul & 0xffff;
if (*endptr++ != '/')
return -EINVAL;
nptr = endptr;
ul = strtoul(nptr, &endptr, 10);
if (endptr <= nptr)
return -EINVAL;
if (bts_id)
*bts_id = ul & 0xffff;
if (*endptr++ != '/')
return -EINVAL;
nptr = endptr;
ul = strtoul(nptr, &endptr, 10);
if (endptr <= nptr)
return -EINVAL;
if (trx_id)
*trx_id = ul & 0xffff;
return 0;
}
/* send the id ack */
int ipaccess_send_id_ack(int fd)
{
return write(fd, id_ack, sizeof(id_ack));
}
int ipaccess_send_id_req(int fd)
{
return write(fd, id_req, sizeof(id_req));
}
/* base handling of the ip.access protocol */
int ipaccess_rcvmsg_base(struct msgb *msg,
struct bsc_fd *bfd)
{
u_int8_t msg_type = *(msg->l2h);
int ret = 0;
switch (msg_type) {
case IPAC_MSGT_PING:
ret = write(bfd->fd, pong, sizeof(pong));
break;
case IPAC_MSGT_PONG:
DEBUGP(DMI, "PONG!\n");
break;
case IPAC_MSGT_ID_ACK:
DEBUGP(DMI, "ID_ACK? -> ACK!\n");
ret = ipaccess_send_id_ack(bfd->fd);
break;
}
return 0;
}
static int ipaccess_rcvmsg(struct e1inp_line *line, struct msgb *msg,
struct bsc_fd *bfd)
{
struct tlv_parsed tlvp;
u_int8_t msg_type = *(msg->l2h);
u_int16_t site_id = 0, bts_id = 0, trx_id = 0;
struct gsm_bts *bts;
/* handle base messages */
ipaccess_rcvmsg_base(msg, bfd);
switch (msg_type) {
case IPAC_MSGT_ID_RESP:
DEBUGP(DMI, "ID_RESP ");
/* parse tags, search for Unit ID */
ipaccess_idtag_parse(&tlvp, (u_int8_t *)msg->l2h + 2,
msgb_l2len(msg)-2);
DEBUGP(DMI, "\n");
if (!TLVP_PRESENT(&tlvp, IPAC_IDTAG_UNIT))
break;
/* lookup BTS, create sign_link, ... */
parse_unitid((char *)TLVP_VAL(&tlvp, IPAC_IDTAG_UNIT),
&site_id, &bts_id, &trx_id);
bts = find_bts_by_unitid(e1h->gsmnet, site_id, bts_id);
if (!bts) {
LOGP(DINP, LOGL_ERROR, "Unable to find BTS configuration for "
" %u/%u/%u, disconnecting\n", site_id, bts_id,
trx_id);
return -EIO;
}
DEBUGP(DINP, "Identified BTS %u/%u/%u\n", site_id, bts_id, trx_id);
if (bfd->priv_nr == 1) {
bts->oml_link = e1inp_sign_link_create(&line->ts[1-1],
E1INP_SIGN_OML, bts->c0,
bts->oml_tei, 0);
} else if (bfd->priv_nr == 2) {
struct e1inp_ts *e1i_ts;
struct bsc_fd *newbfd;
struct gsm_bts_trx *trx = gsm_bts_trx_num(bts, trx_id);
bfd->data = line = bts->oml_link->ts->line;
e1i_ts = &line->ts[2+trx_id - 1];
newbfd = &e1i_ts->driver.ipaccess.fd;
e1inp_ts_config(e1i_ts, line, E1INP_TS_TYPE_SIGN);
trx->rsl_link = e1inp_sign_link_create(e1i_ts,
E1INP_SIGN_RSL, trx,
trx->rsl_tei, 0);
/* get rid of our old temporary bfd */
memcpy(newbfd, bfd, sizeof(*newbfd));
newbfd->priv_nr = 2+trx_id;
bsc_unregister_fd(bfd);
bsc_register_fd(newbfd);
talloc_free(bfd);
}
break;
}
return 0;
}
#define OML_UP 0x0001
#define RSL_UP 0x0002
/*
* read one ipa message from the socket
* return NULL in case of error
*/
struct msgb *ipaccess_read_msg(struct bsc_fd *bfd, int *error)
{
struct msgb *msg = msgb_alloc(TS1_ALLOC_SIZE, "Abis/IP");
struct ipaccess_head *hh;
int len, ret = 0;
if (!msg) {
*error = -ENOMEM;
return NULL;
}
/* first read our 3-byte header */
hh = (struct ipaccess_head *) msg->data;
ret = recv(bfd->fd, msg->data, 3, 0);
if (ret < 0) {
if (errno != EAGAIN)
LOGP(DINP, LOGL_ERROR, "recv error %d %s\n", ret, strerror(errno));
msgb_free(msg);
*error = ret;
return NULL;
} else if (ret == 0) {
msgb_free(msg);
*error = ret;
return NULL;
}
msgb_put(msg, ret);
/* then read te length as specified in header */
msg->l2h = msg->data + sizeof(*hh);
len = ntohs(hh->len);
ret = recv(bfd->fd, msg->l2h, len, 0);
if (ret < len) {
LOGP(DINP, LOGL_ERROR, "short read!\n");
msgb_free(msg);
*error = -EIO;
return NULL;
}
msgb_put(msg, ret);
return msg;
}
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;
struct ipaccess_head *hh;
int ret = 0, error;
msg = ipaccess_read_msg(bfd, &error);
if (!msg) {
if (error == 0) {
link = e1inp_lookup_sign_link(e1i_ts, IPAC_PROTO_OML, 0);
if (link) {
link->trx->bts->ip_access.flags = 0;
LOGP(DINP, LOGL_NOTICE, "BTS %u disappeared, dead socket\n",
link->trx->bts->nr);
} else
LOGP(DINP, LOGL_NOTICE, "unknown BTS disappeared, dead socket\n");
e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_RSL);
e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_OML);
bsc_unregister_fd(bfd);
close(bfd->fd);
bfd->fd = -1;
}
return error;
}
DEBUGP(DMI, "RX %u: %s\n", ts_nr, hexdump(msgb_l2(msg), msgb_l2len(msg)));
hh = (struct ipaccess_head *) msg->data;
if (hh->proto == IPAC_PROTO_IPACCESS) {
ret = ipaccess_rcvmsg(line, msg, bfd);
if (ret < 0) {
e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_RSL);
e1inp_event(e1i_ts, EVT_E1_TEI_DN, 0, IPAC_PROTO_OML);
bsc_unregister_fd(bfd);
close(bfd->fd);
bfd->fd = -1;
}
msgb_free(msg);
return ret;
}
/* BIG FAT WARNING: bfd might no longer exist here, since ipaccess_rcvmsg()
* might have free'd it !!! */
link = e1inp_lookup_sign_link(e1i_ts, hh->proto, 0);
if (!link) {
LOGP(DINP, LOGL_ERROR, "no matching signalling link for "
"hh->proto=0x%02x\n", hh->proto);
msgb_free(msg);
return -EIO;
}
msg->trx = link->trx;
switch (link->type) {
case E1INP_SIGN_RSL:
if (!(msg->trx->bts->ip_access.flags & (RSL_UP << msg->trx->nr))) {
e1inp_event(e1i_ts, EVT_E1_TEI_UP, link->tei, link->sapi);
msg->trx->bts->ip_access.flags |= (RSL_UP << msg->trx->nr);
}
ret = abis_rsl_rcvmsg(msg);
break;
case E1INP_SIGN_OML:
if (!(msg->trx->bts->ip_access.flags & OML_UP)) {
e1inp_event(e1i_ts, EVT_E1_TEI_UP, link->tei, link->sapi);
msg->trx->bts->ip_access.flags |= OML_UP;
}
ret = abis_nm_rcvmsg(msg);
break;
default:
LOGP(DINP, LOGL_NOTICE, "Unknown IP.access protocol proto=0x%02x\n", hh->proto);
msgb_free(msg);
break;
}
return ret;
}
void ipaccess_prepend_header(struct msgb *msg, int proto)
{
struct ipaccess_head *hh;
/* prepend the ip.access header */
hh = (struct ipaccess_head *) msgb_push(msg, sizeof(*hh));
hh->len = htons(msg->len - sizeof(*hh));
hh->proto = proto;
}
static int ts_want_write(struct e1inp_ts *e1i_ts)
{
e1i_ts->driver.ipaccess.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 proto;
int ret;
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;
}
switch (sign_link->type) {
case E1INP_SIGN_OML:
proto = IPAC_PROTO_OML;
break;
case E1INP_SIGN_RSL:
proto = IPAC_PROTO_RSL;
break;
default:
msgb_free(msg);
bfd->when |= BSC_FD_WRITE; /* come back for more msg */
return -EINVAL;
}
msg->l2h = msg->data;
ipaccess_prepend_header(msg, sign_link->tei);
DEBUGP(DMI, "TX %u: %s\n", ts_nr, hexdump(msg->l2h, msgb_l2len(msg)));
ret = send(bfd->fd, msg->data, msg->len, 0);
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, 100000);
return ret;
}
/* callback from select.c in case one of the fd's can be read/written */
static int ipaccess_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;
int rc = 0;
/* In case of early RSL we might not yet have a line */
if (line)
e1i_ts = &line->ts[idx];
if (!line || e1i_ts->type == E1INP_TS_TYPE_SIGN) {
if (what & BSC_FD_READ)
rc = handle_ts1_read(bfd);
if (what & BSC_FD_WRITE)
rc = handle_ts1_write(bfd);
} else
LOGP(DINP, LOGL_ERROR, "unknown E1 TS type %u\n", e1i_ts->type);
return rc;
}
struct e1inp_driver ipaccess_driver = {
.name = "ip.access",
.want_write = ts_want_write,
};
/* callback of the OML listening filedescriptor */
static int listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what)
{
int ret;
int idx = 0;
struct e1inp_line *line;
struct e1inp_ts *e1i_ts;
struct bsc_fd *bfd;
struct sockaddr_in sa;
socklen_t sa_len = sizeof(sa);
if (!(what & BSC_FD_READ))
return 0;
ret = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len);
if (ret < 0) {
perror("accept");
return ret;
}
LOGP(DINP, LOGL_NOTICE, "accept()ed new OML link from %s\n",
inet_ntoa(sa.sin_addr));
line = talloc_zero(tall_bsc_ctx, struct e1inp_line);
if (!line) {
close(ret);
return -ENOMEM;
}
line->driver = &ipaccess_driver;
//line->driver_data = e1h;
/* create virrtual E1 timeslots for signalling */
e1inp_ts_config(&line->ts[1-1], line, E1INP_TS_TYPE_SIGN);
e1i_ts = &line->ts[idx];
bfd = &e1i_ts->driver.ipaccess.fd;
bfd->fd = ret;
bfd->data = line;
bfd->priv_nr = 1;
bfd->cb = ipaccess_fd_cb;
bfd->when = BSC_FD_READ;
ret = bsc_register_fd(bfd);
if (ret < 0) {
LOGP(DINP, LOGL_ERROR, "could not register FD\n");
close(bfd->fd);
talloc_free(line);
return ret;
}
/* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */
ret = ipaccess_send_id_req(bfd->fd);
return ret;
//return e1inp_line_register(line);
}
static int rsl_listen_fd_cb(struct bsc_fd *listen_bfd, unsigned int what)
{
struct sockaddr_in sa;
socklen_t sa_len = sizeof(sa);
struct bsc_fd *bfd;
int ret;
if (!(what & BSC_FD_READ))
return 0;
bfd = talloc_zero(tall_bsc_ctx, struct bsc_fd);
if (!bfd)
return -ENOMEM;
/* Some BTS has connected to us, but we don't know yet which line
* (as created by the OML link) to associate it with. Thus, we
* allocate a temporary bfd until we have received ID from BTS */
bfd->fd = accept(listen_bfd->fd, (struct sockaddr *) &sa, &sa_len);
if (bfd->fd < 0) {
perror("accept");
return bfd->fd;
}
LOGP(DINP, LOGL_NOTICE, "accept()ed new RSL link from %s\n", inet_ntoa(sa.sin_addr));
bfd->priv_nr = 2;
bfd->cb = ipaccess_fd_cb;
bfd->when = BSC_FD_READ;
ret = bsc_register_fd(bfd);
if (ret < 0) {
LOGP(DINP, LOGL_ERROR, "could not register FD\n");
close(bfd->fd);
talloc_free(bfd);
return ret;
}
/* Request ID. FIXME: request LOCATION, HW/SW VErsion, Unit Name, Serno */
ret = write(bfd->fd, id_req, sizeof(id_req));
return 0;
}
static int make_sock(struct bsc_fd *bfd, u_int16_t port,
int (*cb)(struct bsc_fd *fd, unsigned int what))
{
struct sockaddr_in addr;
int ret, on = 1;
bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
bfd->cb = cb;
bfd->when = BSC_FD_READ;
//bfd->data = line;
if (bfd->fd < 0) {
LOGP(DINP, LOGL_ERROR, "could not create TCP socket.\n");
return -EIO;
}
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = INADDR_ANY;
setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
ret = bind(bfd->fd, (struct sockaddr *) &addr, sizeof(addr));
if (ret < 0) {
LOGP(DINP, LOGL_ERROR, "could not bind l2 socket %s\n",
strerror(errno));
close(bfd->fd);
return -EIO;
}
ret = listen(bfd->fd, 1);
if (ret < 0) {
perror("listen");
close(bfd->fd);
return ret;
}
ret = bsc_register_fd(bfd);
if (ret < 0) {
perror("register_listen_fd");
close(bfd->fd);
return ret;
}
return 0;
}
/* Actively connect to a BTS. Currently used by ipaccess-config.c */
int ipaccess_connect(struct e1inp_line *line, struct sockaddr_in *sa)
{
struct e1inp_ts *e1i_ts = &line->ts[0];
struct bsc_fd *bfd = &e1i_ts->driver.ipaccess.fd;
int ret, on = 1;
bfd->fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
bfd->cb = ipaccess_fd_cb;
bfd->when = BSC_FD_READ | BSC_FD_WRITE;
bfd->data = line;
bfd->priv_nr = 1;
if (bfd->fd < 0) {
LOGP(DINP, LOGL_ERROR, "could not create TCP socket.\n");
return -EIO;
}
setsockopt(bfd->fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
ret = connect(bfd->fd, (struct sockaddr *) sa, sizeof(*sa));
if (ret < 0) {
LOGP(DINP, LOGL_ERROR, "could not connect socket\n");
close(bfd->fd);
return ret;
}
ret = bsc_register_fd(bfd);
if (ret < 0) {
close(bfd->fd);
return ret;
}
line->driver = &ipaccess_driver;
return ret;
//return e1inp_line_register(line);
}
int ipaccess_setup(struct gsm_network *gsmnet)
{
int ret;
/* register the driver with the core */
/* FIXME: do this in the plugin initializer function */
ret = e1inp_driver_register(&ipaccess_driver);
if (ret)
return ret;
e1h = talloc_zero(tall_bsc_ctx, struct ia_e1_handle);
if (!e1h)
return -ENOMEM;
e1h->gsmnet = gsmnet;
/* Listen for OML connections */
ret = make_sock(&e1h->listen_fd, IPA_TCP_PORT_OML, listen_fd_cb);
if (ret < 0)
return ret;
/* Listen for RSL connections */
ret = make_sock(&e1h->rsl_listen_fd, IPA_TCP_PORT_RSL, rsl_listen_fd_cb);
return ret;
}
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