Adding LLC-XID encoder / decoder and unit test
The lle-xid encoder/decoder is needed to encode and decode llc xid parameter messages. We need this to exchange sndcp-parameters (SNDCP-XID) and also simple parameters such as encryption IOVs Change-Id: Ia06e4cb08bf9b48c2a4682606d1b1a91d19a9d37
This commit is contained in:
parent
d5d39ae2b6
commit
a536fc644b
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@ -81,6 +81,7 @@ tests/subscr/subscr_test
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tests/oap/oap_test
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tests/gtphub/gtphub_test
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tests/mm_auth/mm_auth_test
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tests/xid/xid_test
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tests/atconfig
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tests/atlocal
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@ -229,6 +229,7 @@ AC_OUTPUT(
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tests/oap/Makefile
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tests/gtphub/Makefile
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tests/mm_auth/Makefile
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tests/xid/Makefile
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doc/Makefile
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doc/examples/Makefile
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Makefile)
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@ -18,7 +18,7 @@ noinst_HEADERS = abis_nm.h abis_rsl.h db.h gsm_04_08.h gsm_data.h \
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gprs_gb_parse.h smpp.h meas_feed.h \
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gprs_gsup_client.h bsc_msg_filter.h \
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oap.h oap_messages.h \
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gtphub.h
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gtphub.h gprs_llc_xid.h
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openbsc_HEADERS = gsm_04_08.h meas_rep.h bsc_api.h
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openbscdir = $(includedir)/openbsc
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@ -0,0 +1,57 @@
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/* GPRS LLC XID field encoding/decoding as per 3GPP TS 44.064 */
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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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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#pragma once
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#include <stdint.h>
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#include <osmocom/core/linuxlist.h>
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/* 3GPP TS 44.064 6.4.1.6 Exchange Identification (XID)
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command/response parameter field */
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struct gprs_llc_xid_field {
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struct llist_head list;
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uint8_t type; /* See also Table 6: LLC layer parameter
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negotiation */
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uint8_t *data; /* Payload data (memory is owned by the
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* creator of the struct) */
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unsigned int data_len; /* Payload length */
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};
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/* Transform a list with XID fields into a XID message (dst) */
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int gprs_llc_compile_xid(uint8_t *dst, int dst_maxlen,
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const struct llist_head *xid_fields);
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/* Transform a XID message (dst) into a list of XID fields */
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struct llist_head *gprs_llc_parse_xid(const void *ctx, const uint8_t *src,
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int src_len);
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/* Create a duplicate of an XID-Field */
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struct gprs_llc_xid_field *gprs_llc_dup_xid_field(const void *ctx,
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const struct gprs_llc_xid_field *xid_field);
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/* Copy an llist with xid fields */
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struct llist_head *gprs_llc_copy_xid(const void *ctx,
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const struct llist_head *xid_fields);
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/* Dump a list with XID fields (Debug) */
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void gprs_llc_dump_xid_fields(const struct llist_head *xid_fields,
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unsigned int logl);
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@ -28,7 +28,7 @@ osmo_sgsn_SOURCES = gprs_gmm.c gprs_sgsn.c gprs_sndcp.c gprs_sndcp_vty.c \
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sgsn_ctrl.c sgsn_auth.c gprs_subscriber.c \
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gprs_utils.c gprs_gsup_client.c \
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sgsn_cdr.c sgsn_ares.c \
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oap.c oap_messages.c
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oap.c oap_messages.c gprs_llc_xid.c
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osmo_sgsn_LDADD = \
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$(top_builddir)/src/libcommon/libcommon.a \
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-lgtp $(OSMO_LIBS) $(LIBOSMOABIS_LIBS) $(LIBCARES_LIBS) \
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@ -0,0 +1,262 @@
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/* GPRS LLC XID field encoding/decoding as per 3GPP TS 44.064 */
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
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* All Rights Reserved
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*
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* Author: Philipp Maier
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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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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <errno.h>
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#include <osmocom/core/utils.h>
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#include <osmocom/core/linuxlist.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/msgb.h>
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#include <osmocom/core/talloc.h>
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#include <openbsc/debug.h>
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#include <openbsc/gprs_llc.h>
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#include <openbsc/sgsn.h>
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#include <openbsc/gprs_llc_xid.h>
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/* Parse XID parameter field */
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static int decode_xid_field(struct gprs_llc_xid_field *xid_field,
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const uint8_t *src, uint8_t src_len)
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{
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uint8_t xl;
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uint8_t type;
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uint8_t len;
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int src_counter = 0;
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/* Exit immediately if it is clear that no
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* parseable data is present */
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if (src_len < 1 || !src)
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return -EINVAL;
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/* Extract header info */
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xl = (*src >> 7) & 1;
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type = (*src >> 2) & 0x1F;
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/* Extract length field */
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len = (*src) & 0x3;
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src++;
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src_counter++;
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if (xl) {
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if (src_len < 2)
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return -EINVAL;
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len = (len << 6) & 0xC0;
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len |= ((*src) >> 2) & 0x3F;
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src++;
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src_counter++;
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}
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/* Fill out struct */
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xid_field->type = type;
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xid_field->data_len = len;
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if (len > 0) {
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if (src_len < src_counter + len)
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return -EINVAL;
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xid_field->data =
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talloc_memdup(xid_field,src,xid_field->data_len);
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} else
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xid_field->data = NULL;
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/* Return consumed length */
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return src_counter + len;
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}
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/* Encode XID parameter field */
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static int encode_xid_field(uint8_t *dst, int dst_maxlen,
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const struct gprs_llc_xid_field *xid_field)
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{
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int xl = 0;
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/* When the length does not fit into 2 bits,
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* we need extended length fields */
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if (xid_field->data_len > 3)
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xl = 1;
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/* Exit immediately if it is clear that no
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* encoding result can be stored */
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if (dst_maxlen < xid_field->data_len + 1 + xl)
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return -EINVAL;
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/* There are only 5 bits reserved for the type, exit on exceed */
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if (xid_field->type > 31)
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return -EINVAL;
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/* Encode header */
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memset(dst, 0, dst_maxlen);
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if (xl)
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dst[0] |= 0x80;
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dst[0] |= (((xid_field->type) & 0x1F) << 2);
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if (xl) {
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dst[0] |= (((xid_field->data_len) >> 6) & 0x03);
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dst[1] = ((xid_field->data_len) << 2) & 0xFC;
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} else
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dst[0] |= ((xid_field->data_len) & 0x03);
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/* Append payload data */
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if (xid_field->data && xid_field->data_len)
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memcpy(dst + 1 + xl, xid_field->data, xid_field->data_len);
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/* Return generated length */
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return xid_field->data_len + 1 + xl;
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}
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/* Transform a list with XID fields into a XID message (dst) */
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int gprs_llc_compile_xid(uint8_t *dst, int dst_maxlen,
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const struct llist_head *xid_fields)
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{
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struct gprs_llc_xid_field *xid_field;
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int rc;
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int byte_counter = 0;
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OSMO_ASSERT(xid_fields);
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OSMO_ASSERT(dst);
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llist_for_each_entry_reverse(xid_field, xid_fields, list) {
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/* Encode XID-Field */
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rc = encode_xid_field(dst, dst_maxlen, xid_field);
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if (rc < 0)
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return -EINVAL;
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/* Advance pointer and lower maxlen for the
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* next encoding round */
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dst += rc;
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byte_counter += rc;
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dst_maxlen -= rc;
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}
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/* Return generated length */
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return byte_counter;
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}
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/* Transform a XID message (dst) into a list of XID fields */
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struct llist_head *gprs_llc_parse_xid(const void *ctx, const uint8_t *src,
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int src_len)
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{
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struct gprs_llc_xid_field *xid_field;
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struct llist_head *xid_fields;
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int rc;
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int max_loops = src_len;
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OSMO_ASSERT(src);
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xid_fields = talloc_zero(ctx, struct llist_head);
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INIT_LLIST_HEAD(xid_fields);
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while (1) {
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/* Bail in case decode_xid_field() constantly returns zero */
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if (max_loops <= 0) {
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talloc_free(xid_fields);
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return NULL;
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}
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/* Decode XID field */
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xid_field = talloc_zero(xid_fields, struct gprs_llc_xid_field);
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rc = decode_xid_field(xid_field, src, src_len);
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/* Immediately stop on error */
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if (rc < 0) {
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talloc_free(xid_fields);
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return NULL;
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}
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/* Add parsed XID field to list */
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llist_add(&xid_field->list, xid_fields);
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/* Advance pointer and lower dst_len for the next
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* decoding round */
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src += rc;
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src_len -= rc;
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/* We are (scuccessfully) done when no further byes are left */
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if (src_len == 0)
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return xid_fields;
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max_loops--;
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}
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}
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/* Create a duplicate of an XID-Field */
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struct gprs_llc_xid_field *gprs_llc_dup_xid_field(const void *ctx, const struct
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gprs_llc_xid_field
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*xid_field)
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{
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struct gprs_llc_xid_field *dup;
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OSMO_ASSERT(xid_field);
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/* Create a copy of the XID field in memory */
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dup = talloc_memdup(ctx, xid_field, sizeof(*xid_field));
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dup->data = talloc_memdup(ctx, xid_field->data, xid_field->data_len);
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/* Unlink duplicate from source list */
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INIT_LLIST_HEAD(&dup->list);
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return dup;
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}
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/* Copy an llist with xid fields */
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struct llist_head *gprs_llc_copy_xid(const void *ctx,
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const struct llist_head *xid_fields)
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{
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struct gprs_llc_xid_field *xid_field;
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struct llist_head *xid_fields_copy;
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OSMO_ASSERT(xid_fields);
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xid_fields_copy = talloc_zero(ctx, struct llist_head);
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INIT_LLIST_HEAD(xid_fields_copy);
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/* Create duplicates and add them to the target list */
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llist_for_each_entry(xid_field, xid_fields, list) {
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llist_add(&gprs_llc_dup_xid_field(ctx, xid_field)->list,
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xid_fields_copy);
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}
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return xid_fields_copy;
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}
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/* Dump a list with XID fields (Debug) */
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void gprs_llc_dump_xid_fields(const struct llist_head *xid_fields,
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unsigned int logl)
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{
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struct gprs_llc_xid_field *xid_field;
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OSMO_ASSERT(xid_fields);
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llist_for_each_entry(xid_field, xid_fields, list) {
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if (xid_field->data_len) {
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OSMO_ASSERT(xid_field->data);
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LOGP(DLLC, logl,
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"XID: type=%d, data_len=%d, data=%s\n",
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xid_field->type, xid_field->data_len,
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osmo_hexdump_nospc(xid_field->data,
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xid_field->data_len));
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} else {
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LOGP(DLLC, logl,
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"XID: type=%d, data_len=%d, data=NULL\n",
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xid_field->type, xid_field->data_len);
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}
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}
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}
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@ -1,4 +1,4 @@
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SUBDIRS = gsm0408 db channel mgcp gprs abis gbproxy trau subscr mm_auth
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SUBDIRS = gsm0408 db channel mgcp gprs abis gbproxy trau subscr mm_auth xid
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if BUILD_NAT
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SUBDIRS += bsc-nat bsc-nat-trie
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@ -124,3 +124,8 @@ cat $abs_srcdir/mm_auth/mm_auth_test.ok > expout
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AT_CHECK([$abs_top_builddir/tests/mm_auth/mm_auth_test], [], [expout], [ignore])
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AT_CLEANUP
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AT_SETUP([xid])
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AT_KEYWORDS([xid])
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cat $abs_srcdir/xid/xid_test.ok > expout
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AT_CHECK([$abs_top_builddir/tests/xid/xid_test], [], [expout], [ignore])
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AT_CLEANUP
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|
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@ -0,0 +1,21 @@
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AM_CPPFLAGS = $(all_includes) -I$(top_srcdir)/include
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AM_CFLAGS=-Wall -ggdb3 $(LIBOSMOCORE_CFLAGS) $(LIBOSMOGSM_CFLAGS) $(LIBCARES_CFLAGS)
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EXTRA_DIST = xid_test.ok
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noinst_PROGRAMS = xid_test
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xid_test_SOURCES = xid_test.c
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xid_test_LDADD = \
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$(top_builddir)/src/gprs/gprs_llc_xid.o \
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$(top_builddir)/src/libcommon/libcommon.a \
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$(LIBOSMOABIS_LIBS) \
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$(LIBOSMOCORE_LIBS) \
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$(LIBOSMOGSM_LIBS) \
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$(LIBOSMOGB_LIBS) \
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$(LIBCARES_LIBS) \
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$(LIBCRYPTO_LIBS) \
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-lgtp -lrt -lm
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|
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@ -0,0 +1,164 @@
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/* Test LLC-XID Encoding/Decoding */
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/* (C) 2016 by sysmocom s.f.m.c. GmbH <info@sysmocom.de>
|
||||
* All Rights Reserved
|
||||
*
|
||||
* Author: Philipp Maier
|
||||
*
|
||||
* 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/>.
|
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*/
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|
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#include <openbsc/gprs_llc_xid.h>
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#include <openbsc/debug.h>
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#include <osmocom/core/talloc.h>
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#include <osmocom/core/utils.h>
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|
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#include <osmocom/core/application.h>
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#include <stdio.h>
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#include <string.h>
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/* Test XID encoding */
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static void test_xid_encode(const void *ctx)
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{
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struct gprs_llc_xid_field xid_field_1;
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struct gprs_llc_xid_field xid_field_2;
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struct gprs_llc_xid_field xid_field_3;
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struct gprs_llc_xid_field xid_field_4;
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LLIST_HEAD(xid_fields);
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uint8_t xid[255];
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uint8_t xid_expected[] =
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{ 0x10, 0x8c, 0x14, 0x43, 0x43, 0x43, 0x43, 0x43, 0x0b, 0x42, 0x42,
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0x42, 0x05, 0x41 };
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int rc;
|
||||
|
||||
printf("Testing LLC XID-Encoder\n");
|
||||
|
||||
/* Setup some simple XID data */
|
||||
xid_field_1.type = 1;
|
||||
xid_field_2.type = 2;
|
||||
xid_field_3.type = 3;
|
||||
xid_field_4.type = 4;
|
||||
|
||||
xid_field_1.data = (uint8_t *) "A";
|
||||
xid_field_2.data = (uint8_t *) "BBB";
|
||||
xid_field_3.data = (uint8_t *) "CCCCC";
|
||||
xid_field_4.data = NULL;
|
||||
|
||||
xid_field_1.data_len = 1;
|
||||
xid_field_2.data_len = 3;
|
||||
xid_field_3.data_len = 5;
|
||||
xid_field_4.data_len = 0;
|
||||
|
||||
llist_add(&xid_field_4.list, &xid_fields);
|
||||
llist_add(&xid_field_3.list, &xid_fields);
|
||||
llist_add(&xid_field_2.list, &xid_fields);
|
||||
llist_add(&xid_field_1.list, &xid_fields);
|
||||
|
||||
printf("Data to encode:\n");
|
||||
gprs_llc_dump_xid_fields(&xid_fields, DSNDCP);
|
||||
|
||||
/* Encode data */
|
||||
rc = gprs_llc_compile_xid(xid, sizeof(xid), &xid_fields);
|
||||
OSMO_ASSERT(rc == 14);
|
||||
printf("Encoded: %s (%i bytes)\n", osmo_hexdump_nospc(xid, rc), rc);
|
||||
printf("Expected: %s (%i bytes)\n",
|
||||
osmo_hexdump_nospc(xid_expected, sizeof(xid_expected)),
|
||||
(int)sizeof(xid_expected));
|
||||
|
||||
OSMO_ASSERT(memcmp(xid_expected, xid, sizeof(xid_expected)) == 0);
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
/* Test XID decoding */
|
||||
static void test_xid_decode(const void *ctx)
|
||||
{
|
||||
struct llist_head *xid_fields;
|
||||
int rc;
|
||||
|
||||
printf("Testing LLC XID-Decoder/Encoder\n");
|
||||
|
||||
/* Example of a real world LLC-XID message */
|
||||
uint8_t xid[] =
|
||||
{ 0x01, 0x00, 0x16, 0x05, 0xf0, 0x1a, 0x05, 0xf0, 0xac, 0xd8, 0x00,
|
||||
0x01, 0x00, 0x02, 0x31, 0x82, 0x02, 0x27, 0x89, 0xff, 0xe0, 0x00, 0x0f,
|
||||
0x00, 0xa8, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x00, 0x02, 0x01, 0x02,
|
||||
0x00, 0x03, 0x01, 0x03, 0x00, 0x04, 0x01, 0x04, 0x00, 0x05, 0x01, 0x05,
|
||||
0x00, 0x06, 0x00, 0x07, 0x01, 0x07, 0x00, 0x08, 0x01, 0x08, 0x80, 0x00,
|
||||
0x04, 0x12, 0x00, 0x40, 0x07 };
|
||||
|
||||
uint8_t xid_r[512];
|
||||
|
||||
/* Decode and display XID fields */
|
||||
xid_fields = gprs_llc_parse_xid(ctx, xid, sizeof(xid));
|
||||
OSMO_ASSERT(xid_fields);
|
||||
|
||||
printf("Decoded:\n");
|
||||
gprs_llc_dump_xid_fields(xid_fields, DSNDCP);
|
||||
|
||||
|
||||
/* Encode xid-fields again */
|
||||
rc = gprs_llc_compile_xid(xid_r, sizeof(xid_r), xid_fields);
|
||||
printf("Result length=%i\n",rc);
|
||||
printf("Encoded: %s\n", osmo_hexdump_nospc(xid, sizeof(xid)));
|
||||
printf("Rencoded: %s\n", osmo_hexdump_nospc(xid_r, rc));
|
||||
|
||||
OSMO_ASSERT(rc == 64);
|
||||
OSMO_ASSERT(memcmp(xid, xid_r, sizeof(xid)) == 0);
|
||||
|
||||
/* Free xid fields */
|
||||
talloc_free(xid_fields);
|
||||
|
||||
printf("\n");
|
||||
}
|
||||
|
||||
static struct log_info_cat gprs_categories[] = {
|
||||
[DSNDCP] = {
|
||||
.name = "DSNDCP",
|
||||
.description =
|
||||
"GPRS Sub-Network Dependent Control Protocol (SNDCP)",
|
||||
.enabled = 1,.loglevel = LOGL_DEBUG,
|
||||
}
|
||||
};
|
||||
|
||||
static struct log_info info = {
|
||||
.cat = gprs_categories,
|
||||
.num_cat = ARRAY_SIZE(gprs_categories),
|
||||
};
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
void *xid_ctx;
|
||||
|
||||
osmo_init_logging(&info);
|
||||
|
||||
xid_ctx = talloc_named_const(NULL, 0, "xid_ctx");
|
||||
|
||||
test_xid_decode(xid_ctx);
|
||||
test_xid_encode(xid_ctx);
|
||||
printf("Done\n");
|
||||
|
||||
talloc_report_full(xid_ctx, stderr);
|
||||
OSMO_ASSERT(talloc_total_blocks(xid_ctx) == 1);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* stubs */
|
||||
struct osmo_prim_hdr;
|
||||
int bssgp_prim_cb(struct osmo_prim_hdr *oph, void *ctx)
|
||||
{
|
||||
abort();
|
||||
}
|
|
@ -0,0 +1,12 @@
|
|||
Testing LLC XID-Decoder/Encoder
|
||||
Decoded:
|
||||
Result length=64
|
||||
Encoded: 01001605f01a05f0acd8000100023182022789ffe0000f00a8000000010101000201020003010300040104000501050006000701070008010880000412004007
|
||||
Rencoded: 01001605f01a05f0acd8000100023182022789ffe0000f00a8000000010101000201020003010300040104000501050006000701070008010880000412004007
|
||||
|
||||
Testing LLC XID-Encoder
|
||||
Data to encode:
|
||||
Encoded: 108c1443434343430b4242420541 (14 bytes)
|
||||
Expected: 108c1443434343430b4242420541 (14 bytes)
|
||||
|
||||
Done
|
Loading…
Reference in New Issue