289 lines
6.8 KiB
C
289 lines
6.8 KiB
C
/* GPRS Subscriber Update Protocol client */
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/* (C) 2014 by Sysmocom s.f.m.c. GmbH
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* All Rights Reserved
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*
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* Author: Jacob Erlbeck
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include <openbsc/gprs_gsup_client.h>
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#include <osmocom/abis/ipa.h>
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#include <osmocom/gsm/protocol/ipaccess.h>
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#include <osmocom/core/msgb.h>
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#include <openbsc/debug.h>
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#include <errno.h>
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#include <string.h>
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extern void *tall_bsc_ctx;
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static void start_test_procedure(struct gprs_gsup_client *gsupc);
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static void gsup_client_send_ping(struct gprs_gsup_client *gsupc)
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{
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struct msgb *msg = gprs_gsup_msgb_alloc();
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msg->l2h = msgb_put(msg, 1);
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msg->l2h[0] = IPAC_MSGT_PING;
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ipa_msg_push_header(msg, IPAC_PROTO_IPACCESS);
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ipa_client_conn_send(gsupc->link, msg);
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}
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static int gsup_client_connect(struct gprs_gsup_client *gsupc)
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{
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int rc;
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if (gsupc->is_connected)
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return 0;
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if (osmo_timer_pending(&gsupc->connect_timer)) {
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LOGP(DLINP, LOGL_DEBUG,
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"GSUP connect: connect timer already running\n");
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osmo_timer_del(&gsupc->connect_timer);
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}
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if (osmo_timer_pending(&gsupc->ping_timer)) {
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LOGP(DLINP, LOGL_DEBUG,
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"GSUP connect: ping timer already running\n");
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osmo_timer_del(&gsupc->ping_timer);
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}
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if (ipa_client_conn_clear_queue(gsupc->link) > 0)
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LOGP(DLINP, LOGL_DEBUG, "GSUP connect: discarded stored messages\n");
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rc = ipa_client_conn_open(gsupc->link);
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if (rc >= 0) {
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LOGP(DGPRS, LOGL_INFO, "GSUP connecting to %s:%d\n",
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gsupc->link->addr, gsupc->link->port);
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return 0;
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}
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LOGP(DGPRS, LOGL_INFO, "GSUP failed to connect to %s:%d: %s\n",
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gsupc->link->addr, gsupc->link->port, strerror(-rc));
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if (rc == -EBADF || rc == -ENOTSOCK || rc == -EAFNOSUPPORT ||
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rc == -EINVAL)
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return rc;
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osmo_timer_schedule(&gsupc->connect_timer, GPRS_GSUP_RECONNECT_INTERVAL, 0);
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LOGP(DGPRS, LOGL_INFO, "Scheduled timer to retry GSUP connect to %s:%d\n",
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gsupc->link->addr, gsupc->link->port);
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return 0;
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}
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static void connect_timer_cb(void *gsupc_)
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{
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struct gprs_gsup_client *gsupc = gsupc_;
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if (gsupc->is_connected)
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return;
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gsup_client_connect(gsupc);
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}
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static void gsup_client_updown_cb(struct ipa_client_conn *link, int up)
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{
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struct gprs_gsup_client *gsupc = link->data;
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LOGP(DGPRS, LOGL_INFO, "GSUP link to %s:%d %s\n",
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link->addr, link->port, up ? "UP" : "DOWN");
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gsupc->is_connected = up;
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if (up) {
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start_test_procedure(gsupc);
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osmo_timer_del(&gsupc->connect_timer);
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} else {
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osmo_timer_del(&gsupc->ping_timer);
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osmo_timer_schedule(&gsupc->connect_timer,
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GPRS_GSUP_RECONNECT_INTERVAL, 0);
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}
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}
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static int gsup_client_read_cb(struct ipa_client_conn *link, struct msgb *msg)
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{
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struct ipaccess_head *hh = (struct ipaccess_head *) msg->data;
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struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg);
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struct gprs_gsup_client *gsupc = (struct gprs_gsup_client *)link->data;
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int rc;
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static struct ipaccess_unit ipa_dev = {
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.unit_name = "SGSN"
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};
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msg->l2h = &hh->data[0];
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rc = ipaccess_bts_handle_ccm(link, &ipa_dev, msg);
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if (rc < 0) {
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LOGP(DGPRS, LOGL_NOTICE,
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"GSUP received an invalid IPA/CCM message from %s:%d\n",
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link->addr, link->port);
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/* Link has been closed */
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gsupc->is_connected = 0;
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msgb_free(msg);
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return -1;
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}
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if (rc == 1) {
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uint8_t msg_type = *(msg->l2h);
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/* CCM message */
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if (msg_type == IPAC_MSGT_PONG) {
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LOGP(DGPRS, LOGL_DEBUG, "GSUP receiving PONG\n");
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gsupc->got_ipa_pong = 1;
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}
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msgb_free(msg);
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return 0;
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}
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if (hh->proto != IPAC_PROTO_OSMO)
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goto invalid;
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if (!he || msgb_l2len(msg) < sizeof(*he) ||
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he->proto != IPAC_PROTO_EXT_GSUP)
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goto invalid;
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msg->l2h = &he->data[0];
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OSMO_ASSERT(gsupc->read_cb != NULL);
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gsupc->read_cb(gsupc, msg);
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/* Not freeing msg here, because that must be done by the read_cb. */
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return 0;
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invalid:
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LOGP(DGPRS, LOGL_NOTICE,
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"GSUP received an invalid IPA message from %s:%d, size = %d\n",
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link->addr, link->port, msgb_length(msg));
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msgb_free(msg);
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return -1;
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}
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static void ping_timer_cb(void *gsupc_)
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{
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struct gprs_gsup_client *gsupc = gsupc_;
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LOGP(DGPRS, LOGL_INFO, "GSUP ping callback (%s, %s PONG)\n",
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gsupc->is_connected ? "connected" : "not connected",
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gsupc->got_ipa_pong ? "got" : "didn't get");
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if (gsupc->got_ipa_pong) {
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start_test_procedure(gsupc);
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return;
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}
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LOGP(DGPRS, LOGL_NOTICE, "GSUP ping timed out, reconnecting\n");
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ipa_client_conn_close(gsupc->link);
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gsupc->is_connected = 0;
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gsup_client_connect(gsupc);
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}
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static void start_test_procedure(struct gprs_gsup_client *gsupc)
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{
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gsupc->ping_timer.data = gsupc;
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gsupc->ping_timer.cb = &ping_timer_cb;
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gsupc->got_ipa_pong = 0;
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osmo_timer_schedule(&gsupc->ping_timer, GPRS_GSUP_PING_INTERVAL, 0);
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LOGP(DGPRS, LOGL_DEBUG, "GSUP sending PING\n");
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gsup_client_send_ping(gsupc);
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}
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struct gprs_gsup_client *gprs_gsup_client_create(const char *ip_addr,
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unsigned int tcp_port,
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gprs_gsup_read_cb_t read_cb)
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{
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struct gprs_gsup_client *gsupc;
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int rc;
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gsupc = talloc_zero(tall_bsc_ctx, struct gprs_gsup_client);
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OSMO_ASSERT(gsupc);
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gsupc->link = ipa_client_conn_create(gsupc,
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/* no e1inp */ NULL,
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0,
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ip_addr, tcp_port,
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gsup_client_updown_cb,
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gsup_client_read_cb,
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/* default write_cb */ NULL,
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gsupc);
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if (!gsupc->link)
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goto failed;
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gsupc->connect_timer.data = gsupc;
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gsupc->connect_timer.cb = &connect_timer_cb;
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rc = gsup_client_connect(gsupc);
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if (rc < 0)
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goto failed;
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gsupc->read_cb = read_cb;
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return gsupc;
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failed:
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gprs_gsup_client_destroy(gsupc);
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return NULL;
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}
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void gprs_gsup_client_destroy(struct gprs_gsup_client *gsupc)
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{
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osmo_timer_del(&gsupc->connect_timer);
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osmo_timer_del(&gsupc->ping_timer);
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if (gsupc->link) {
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ipa_client_conn_close(gsupc->link);
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ipa_client_conn_destroy(gsupc->link);
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gsupc->link = NULL;
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}
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talloc_free(gsupc);
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}
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int gprs_gsup_client_send(struct gprs_gsup_client *gsupc, struct msgb *msg)
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{
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if (!gsupc) {
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msgb_free(msg);
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return -ENOTCONN;
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}
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if (!gsupc->is_connected) {
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msgb_free(msg);
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return -EAGAIN;
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}
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ipa_prepend_header_ext(msg, IPAC_PROTO_EXT_GSUP);
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ipa_msg_push_header(msg, IPAC_PROTO_OSMO);
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ipa_client_conn_send(gsupc->link, msg);
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return 0;
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}
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struct msgb *gprs_gsup_msgb_alloc(void)
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{
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return msgb_alloc_headroom(4000, 64, __func__);
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}
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