From bb23dc17f8f56be836dc50c925c04a5aeaec979c Mon Sep 17 00:00:00 2001 From: Jacob Erlbeck Date: Thu, 18 Dec 2014 12:28:21 +0100 Subject: [PATCH] gprs: Add GSUP client This commit adds the client code to get subscriber information from a remote server. It provides an IPA over TCP connection to transmit and receive GSUP messages. Sponsored-by: On-Waves ehf --- openbsc/include/openbsc/Makefile.am | 3 +- openbsc/include/openbsc/gprs_gsup_client.h | 44 +++++++ openbsc/src/gprs/Makefile.am | 2 +- openbsc/src/gprs/gprs_gsup_client.c | 132 +++++++++++++++++++++ 4 files changed, 179 insertions(+), 2 deletions(-) create mode 100644 openbsc/include/openbsc/gprs_gsup_client.h create mode 100644 openbsc/src/gprs/gprs_gsup_client.c diff --git a/openbsc/include/openbsc/Makefile.am b/openbsc/include/openbsc/Makefile.am index 92978e7ce..e792ff61e 100644 --- a/openbsc/include/openbsc/Makefile.am +++ b/openbsc/include/openbsc/Makefile.am @@ -15,7 +15,8 @@ noinst_HEADERS = abis_nm.h abis_rsl.h db.h gsm_04_08.h gsm_data.h \ bss.h gsm_data_shared.h ipaccess.h mncc_int.h \ arfcn_range_encode.h nat_rewrite_trie.h bsc_nat_callstats.h \ osmux.h mgcp_transcode.h rtp.h gprs_utils.h \ - gprs_gb_parse.h smpp.h meas_feed.h gprs_gsup_messages.h + gprs_gb_parse.h smpp.h meas_feed.h gprs_gsup_messages.h \ + gprs_gsup_client.h openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h openbscdir = $(includedir)/openbsc diff --git a/openbsc/include/openbsc/gprs_gsup_client.h b/openbsc/include/openbsc/gprs_gsup_client.h new file mode 100644 index 000000000..89034e00a --- /dev/null +++ b/openbsc/include/openbsc/gprs_gsup_client.h @@ -0,0 +1,44 @@ +/* GPRS Subscriber Update Protocol client */ + +/* (C) 2014 by Sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * Author: Jacob Erlbeck + * + * 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 . + * + */ +#pragma once + +struct msgb; +struct ipa_client_conn; +struct gprs_gsup_client; + +/* Expects message in msg->l2h */ +typedef int (*gprs_gsup_read_cb_t)(struct gprs_gsup_client *gsupc, struct msgb *msg); + +struct gprs_gsup_client { + struct ipa_client_conn *link; + gprs_gsup_read_cb_t read_cb; + void *data; +}; + +struct gprs_gsup_client *gprs_gsup_client_create(const char *ip_addr, + unsigned int tcp_port, + gprs_gsup_read_cb_t read_cb); + +void gprs_gsup_client_destroy(struct gprs_gsup_client *gsupc); +int gprs_gsup_client_send(struct gprs_gsup_client *gsupc, struct msgb *msg); +struct msgb *gprs_gsup_msgb_alloc(void); + diff --git a/openbsc/src/gprs/Makefile.am b/openbsc/src/gprs/Makefile.am index d45aaee4a..b5a61b120 100644 --- a/openbsc/src/gprs/Makefile.am +++ b/openbsc/src/gprs/Makefile.am @@ -23,7 +23,7 @@ osmo_sgsn_SOURCES = gprs_gmm.c gprs_sgsn.c gprs_sndcp.c gprs_sndcp_vty.c \ sgsn_main.c sgsn_vty.c sgsn_libgtp.c \ gprs_llc.c gprs_llc_parse.c gprs_llc_vty.c crc24.c \ sgsn_ctrl.c sgsn_auth.c gprs_subscriber.c \ - gprs_gsup_messages.c gprs_utils.c + gprs_gsup_messages.c gprs_utils.c gprs_gsup_client.c osmo_sgsn_LDADD = \ $(top_builddir)/src/libcommon/libcommon.a \ -lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) diff --git a/openbsc/src/gprs/gprs_gsup_client.c b/openbsc/src/gprs/gprs_gsup_client.c new file mode 100644 index 000000000..15988bcc8 --- /dev/null +++ b/openbsc/src/gprs/gprs_gsup_client.c @@ -0,0 +1,132 @@ +/* GPRS Subscriber Update Protocol client */ + +/* (C) 2014 by Sysmocom s.f.m.c. GmbH + * All Rights Reserved + * + * Author: Jacob Erlbeck + * + * 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 . + * + */ + +#include + +#include +#include +#include + +#include + +#include + +extern void *tall_bsc_ctx; + +static void gsup_client_updown_cb(struct ipa_client_conn *link, int up) +{ + LOGP(DGPRS, LOGL_NOTICE, "GSUP link to %s:%d %s\n", + link->addr, link->port, up ? "UP" : "DOWN"); + +} + +static int gsup_client_read_cb(struct ipa_client_conn *link, struct msgb *msg) +{ + struct ipaccess_head *hh = (struct ipaccess_head *) msg->data; + struct ipaccess_head_ext *he = (struct ipaccess_head_ext *) msgb_l2(msg); + struct gprs_gsup_client *gsupc = (struct gprs_gsup_client *)link->data; + + 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(gsupc->read_cb != NULL); + gsupc->read_cb(gsupc, msg); + + /* Not freeing msg here, because that must be done by the read_cb. */ + return 0; + +invalid: + LOGP(DGPRS, LOGL_NOTICE, + "GSUP received an invalid IPA message from %s:%d, size = %d\n", + link->addr, link->port, msgb_length(msg)); + + msgb_free(msg); + return -1; +} + +struct gprs_gsup_client *gprs_gsup_client_create(const char *ip_addr, + unsigned int tcp_port, + gprs_gsup_read_cb_t read_cb) +{ + struct gprs_gsup_client *gsupc; + int rc; + + gsupc = talloc_zero(tall_bsc_ctx, struct gprs_gsup_client); + OSMO_ASSERT(gsupc); + + gsupc->link = ipa_client_conn_create(gsupc, + /* no e1inp */ NULL, + 0, + ip_addr, tcp_port, + gsup_client_updown_cb, + gsup_client_read_cb, + /* default write_cb */ NULL, + gsupc); + if (!gsupc->link) + goto failed; + + rc = ipa_client_conn_open(gsupc->link); + + if (rc < 0 && rc != -EINPROGRESS) { + LOGP(DGPRS, LOGL_NOTICE, "GSUP failed to connect to %s:%d\n", + ip_addr, tcp_port); + goto failed; + } + + gsupc->read_cb = read_cb; + + return gsupc; + +failed: + talloc_free(gsupc); + return NULL; +} + +void gprs_gsup_client_destroy(struct gprs_gsup_client *gsupc) +{ + ipa_client_conn_destroy(gsupc->link); +} + +int gprs_gsup_client_send(struct gprs_gsup_client *gsupc, struct msgb *msg) +{ + if (!gsupc) { + msgb_free(msg); + return -ENOTCONN; + } + + ipa_prepend_header_ext(msg, IPAC_PROTO_EXT_GSUP); + ipa_msg_push_header(msg, IPAC_PROTO_OSMO); + ipa_client_conn_send(gsupc->link, msg); + + return 0; +} + +struct msgb *gprs_gsup_msgb_alloc(void) +{ + return msgb_alloc_headroom(4000, 64, __func__); +}