From 7b656884cfadfd8c56355e8a6c690721827b5b30 Mon Sep 17 00:00:00 2001 From: Neels Hofmeyr Date: Sun, 9 Jul 2017 22:09:18 +0200 Subject: split off osmo-bsc: remove files, apply build Change-Id: I64d84c52f6e38e98144eb9be8f0ab82e0e1f6cca --- src/gprs/gprs_llc_xid.c | 281 ------------------------------------------------ 1 file changed, 281 deletions(-) delete mode 100644 src/gprs/gprs_llc_xid.c (limited to 'src/gprs/gprs_llc_xid.c') diff --git a/src/gprs/gprs_llc_xid.c b/src/gprs/gprs_llc_xid.c deleted file mode 100644 index fe631715a..000000000 --- a/src/gprs/gprs_llc_xid.c +++ /dev/null @@ -1,281 +0,0 @@ -/* GPRS LLC XID field encoding/decoding as per 3GPP TS 44.064 */ - -/* (C) 2016 by sysmocom s.f.m.c. GmbH - * 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 . - */ - -#include -#include -#include -#include - -#include -#include -#include -#include -#include - -#include -#include -#include -#include - -const struct value_string gprs_llc_xid_type_names[] = { - { GPRS_LLC_XID_T_VERSION, "VERSION"}, - { GPRS_LLC_XID_T_IOV_UI, "IOV_UI"}, - { GPRS_LLC_XID_T_IOV_I, "IOV_I"}, - { GPRS_LLC_XID_T_T200, "T200"}, - { GPRS_LLC_XID_T_N200, "N200"}, - { GPRS_LLC_XID_T_N201_U, "N201_"}, - { GPRS_LLC_XID_T_N201_I, "N201_I"}, - { GPRS_LLC_XID_T_mD, "mD"}, - { GPRS_LLC_XID_T_mU, "mU"}, - { GPRS_LLC_XID_T_kD, "kD"}, - { GPRS_LLC_XID_T_kU, "kU"}, - { GPRS_LLC_XID_T_L3_PAR, "L3_PAR"}, - { GPRS_LLC_XID_T_RESET, "RESET"}, - { 0, NULL }, -}; - -/* Parse XID parameter field */ -static int decode_xid_field(struct gprs_llc_xid_field *xid_field, - const uint8_t *src, uint8_t src_len) -{ - uint8_t xl; - uint8_t type; - uint8_t len; - int src_counter = 0; - - /* Exit immediately if it is clear that no - * parseable data is present */ - if (src_len < 1 || !src) - return -EINVAL; - - /* Extract header info */ - xl = (*src >> 7) & 1; - type = (*src >> 2) & 0x1F; - - /* Extract length field */ - len = (*src) & 0x3; - src++; - src_counter++; - if (xl) { - if (src_len < 2) - return -EINVAL; - len = (len << 6) & 0xC0; - len |= ((*src) >> 2) & 0x3F; - src++; - src_counter++; - } - - /* Fill out struct */ - xid_field->type = type; - xid_field->data_len = len; - if (len > 0) { - if (src_len < src_counter + len) - return -EINVAL; - xid_field->data = - talloc_memdup(xid_field,src,xid_field->data_len); - } else - xid_field->data = NULL; - - /* Return consumed length */ - return src_counter + len; -} - -/* Encode XID parameter field */ -static int encode_xid_field(uint8_t *dst, int dst_maxlen, - const struct gprs_llc_xid_field *xid_field) -{ - int xl = 0; - - /* When the length does not fit into 2 bits, - * we need extended length fields */ - if (xid_field->data_len > 3) - xl = 1; - - /* Exit immediately if it is clear that no - * encoding result can be stored */ - if (dst_maxlen < xid_field->data_len + 1 + xl) - return -EINVAL; - - /* There are only 5 bits reserved for the type, exit on exceed */ - if (xid_field->type > 31) - return -EINVAL; - - /* Encode header */ - memset(dst, 0, dst_maxlen); - if (xl) - dst[0] |= 0x80; - dst[0] |= (((xid_field->type) & 0x1F) << 2); - - if (xl) { - dst[0] |= (((xid_field->data_len) >> 6) & 0x03); - dst[1] = ((xid_field->data_len) << 2) & 0xFC; - } else - dst[0] |= ((xid_field->data_len) & 0x03); - - /* Append payload data */ - if (xid_field->data && xid_field->data_len) - memcpy(dst + 1 + xl, xid_field->data, xid_field->data_len); - - /* Return generated length */ - return xid_field->data_len + 1 + xl; -} - -/* Transform a list with XID fields into a XID message (dst) */ -int gprs_llc_compile_xid(uint8_t *dst, int dst_maxlen, - const struct llist_head *xid_fields) -{ - struct gprs_llc_xid_field *xid_field; - int rc; - int byte_counter = 0; - - OSMO_ASSERT(xid_fields); - OSMO_ASSERT(dst); - - llist_for_each_entry_reverse(xid_field, xid_fields, list) { - /* Encode XID-Field */ - rc = encode_xid_field(dst, dst_maxlen, xid_field); - if (rc < 0) - return -EINVAL; - - /* Advance pointer and lower maxlen for the - * next encoding round */ - dst += rc; - byte_counter += rc; - dst_maxlen -= rc; - } - - /* Return generated length */ - return byte_counter; -} - -/* Transform a XID message (dst) into a list of XID fields */ -struct llist_head *gprs_llc_parse_xid(const void *ctx, const uint8_t *src, - int src_len) -{ - struct gprs_llc_xid_field *xid_field; - struct llist_head *xid_fields; - - int rc; - int max_loops = src_len; - - OSMO_ASSERT(src); - - xid_fields = talloc_zero(ctx, struct llist_head); - INIT_LLIST_HEAD(xid_fields); - - while (1) { - /* Bail in case decode_xid_field() constantly returns zero */ - if (max_loops <= 0) { - talloc_free(xid_fields); - return NULL; - } - - /* Decode XID field */ - xid_field = talloc_zero(xid_fields, struct gprs_llc_xid_field); - rc = decode_xid_field(xid_field, src, src_len); - - /* Immediately stop on error */ - if (rc < 0) { - talloc_free(xid_fields); - return NULL; - } - - /* Add parsed XID field to list */ - llist_add(&xid_field->list, xid_fields); - - /* Advance pointer and lower dst_len for the next - * decoding round */ - src += rc; - src_len -= rc; - - /* We are (scuccessfully) done when no further byes are left */ - if (src_len == 0) - return xid_fields; - - max_loops--; - } -} - -/* Create a duplicate of an XID-Field */ -struct gprs_llc_xid_field *gprs_llc_dup_xid_field(const void *ctx, const struct - gprs_llc_xid_field - *xid_field) -{ - struct gprs_llc_xid_field *dup; - - OSMO_ASSERT(xid_field); - - /* Create a copy of the XID field in memory */ - dup = talloc_memdup(ctx, xid_field, sizeof(*xid_field)); - dup->data = talloc_memdup(ctx, xid_field->data, xid_field->data_len); - - /* Unlink duplicate from source list */ - INIT_LLIST_HEAD(&dup->list); - - return dup; -} - -/* Copy an llist with xid fields */ -struct llist_head *gprs_llc_copy_xid(const void *ctx, - const struct llist_head *xid_fields) -{ - struct gprs_llc_xid_field *xid_field; - struct llist_head *xid_fields_copy; - - OSMO_ASSERT(xid_fields); - - xid_fields_copy = talloc_zero(ctx, struct llist_head); - INIT_LLIST_HEAD(xid_fields_copy); - - /* Create duplicates and add them to the target list */ - llist_for_each_entry(xid_field, xid_fields, list) { - llist_add(&gprs_llc_dup_xid_field(ctx, xid_field)->list, - xid_fields_copy); - } - - return xid_fields_copy; -} - -/* Dump a list with XID fields (Debug) */ -void gprs_llc_dump_xid_fields(const struct llist_head *xid_fields, - unsigned int logl) -{ - struct gprs_llc_xid_field *xid_field; - - OSMO_ASSERT(xid_fields); - - llist_for_each_entry(xid_field, xid_fields, list) { - if (xid_field->data_len) { - OSMO_ASSERT(xid_field->data); - LOGP(DLLC, logl, - "XID: type %s, data_len=%d, data=%s\n", - get_value_string(gprs_llc_xid_type_names, - xid_field->type), - xid_field->data_len, - osmo_hexdump_nospc(xid_field->data, - xid_field->data_len)); - } else { - LOGP(DLLC, logl, - "XID: type=%d, data_len=%d, data=NULL\n", - xid_field->type, xid_field->data_len); - } - } -} -- cgit v1.2.3