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/* GSM Subscriber Update Protocol server */
/* (C) 2015 by Ivan Klyuchnikov <kluchnikovi@gmail.com>
*
* 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 <osmocom/abis/ipa.h>
#include <osmocom/gsm/protocol/ipaccess.h>
#include <osmocom/core/msgb.h>
#include <osmocom/core/utils.h>
#include <openbsc/debug.h>
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include <openbsc/sup_server.h>
#include <openbsc/reg_proxy.h>
static int ipa_sock_server_cb(struct ipa_server_conn *conn, struct msgb *msg)
{
struct gsm_sup_server *sup_server = conn->data;
struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg);
int ret;
msg->l2h = &hh->data[0]; /* Handle IPA PING, PONG and ID_ACK messages. */
ret = ipa_ccm_rcvmsg_base(msg, &conn->ofd);
switch(ret) {
case -1:
/* error in IPA control message handling */
goto invalid;
case 1:
/* this is an IPA control message, skip further processing */
return 0;
case 0:
/* this is not an IPA control message, continue */
break;
default:
LOGP(DSUP, LOGL_ERROR, "Unexpected return from "
"ipa_ccm_rcvmsg_base "
"(ret=%d)\n", ret);
goto invalid;
}
if (hh->proto != IPAC_PROTO_OSMO)
goto invalid;
if (!he || msgb_l2len(msg) < sizeof(*he) ||
he->proto != IPAC_PROTO_EXT_GSUP)
goto invalid;
msg->l2h = &he->data[0];
OSMO_ASSERT(sup_server->read_cb != NULL);
sup_server->read_cb(sup_server, msg);
/* Not freeing msg here, because that must be done by the read_cb. */
return 0;
invalid:
LOGP(DSUP, LOGL_NOTICE,
"SUP received an invalid IPA message from %s:%d, size = %d\n",
sup_server->link->addr, sup_server->link->port, msgb_length(msg));
msgb_free(msg);
return -1;
}
static int sup_accept_cb(struct ipa_server_link *link, int fd)
{
struct gsm_sup_server *sup_server = link->data;
struct ipa_server_conn *server_conn;
server_conn = talloc_zero(tall_reg_ctx, struct ipa_server_conn);
if (server_conn == NULL) {
LOGP(DSUP, LOGL_ERROR, "cannot allocate memory for "
"origin IPA\n");
close(fd);
return -ENOMEM;
}
server_conn = ipa_server_conn_create(tall_reg_ctx, link, fd,
ipa_sock_server_cb, NULL, sup_server);
if (server_conn == NULL) {
LOGP(DSUP, LOGL_ERROR, "could not create server peer: %s\n",
strerror(errno));
return -ENOMEM;
}
sup_server->server_conn = server_conn;
return 0;
}
struct gsm_sup_server *sup_server_create(const char *ip_addr,
unsigned int tcp_port,
sup_read_cb_t read_cb,
void *app)
{
struct gsm_sup_server *sup_server;
sup_server = talloc_zero(tall_reg_ctx, struct gsm_sup_server);
OSMO_ASSERT(sup_server);
sup_server->app = app;
sup_server->read_cb = read_cb;
sup_server->link = ipa_server_link_create(tall_reg_ctx, NULL,
ip_addr, tcp_port,
sup_accept_cb, sup_server);
if (sup_server->link == NULL) {
LOGP(DSUP, LOGL_ERROR, "cannot create OML "
"BSC link: %s\n", strerror(errno));
return NULL;
}
if (ipa_server_link_open(sup_server->link) < 0) {
LOGP(DSUP, LOGL_ERROR, "cannot open OML BSC link: %s\n",
strerror(errno));
ipa_server_link_destroy(sup_server->link);
return NULL;
}
return sup_server;
}
int sup_server_send(struct gsm_sup_server *sup_server, struct msgb *msg)
{
if (!sup_server) {
msgb_free(msg);
return -ENOTCONN;
}
if (!sup_server->link) {
msgb_free(msg);
return -EAGAIN;
}
ipa_prepend_header_ext(msg, IPAC_PROTO_EXT_GSUP);
ipa_msg_push_header(msg, IPAC_PROTO_OSMO);
ipa_server_conn_send(sup_server->server_conn, msg);
return 0;
}
struct msgb *sup_msgb_alloc(void)
{
return msgb_alloc_headroom(4000, 64, __func__);
}
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