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libosmo-pfcp/src/libosmo-gtlv/gtlv_dec_enc.c

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/*
* (C) 2021-2022 by sysmocom - s.f.m.c. GmbH <info@sysmocom.de>
* All Rights Reserved.
*
* Author: Neels Janosch Hofmeyr <nhofmeyr@sysmocom.de>
*
* SPDX-License-Identifier: GPL-2.0+
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <errno.h>
#include <string.h>
#include <osmocom/core/utils.h>
#include <osmocom/gtlv/gtlv_dec_enc.h>
#define RETURN_ERROR(RC, TAG_INST, FMT, ARGS...) \
do {\
if (err_cb) { \
if ((TAG_INST).instance_present) \
err_cb(err_cb_data, (void *)decoded_struct, __FILE__, __LINE__, \
"tag 0x%x = %s instance %u: " FMT " (%d: %s)\n", \
(TAG_INST).tag, get_value_string(iei_strs, (TAG_INST).tag), \
(TAG_INST).instance, ##ARGS, \
RC, strerror((RC) > 0 ? (RC) : -(RC))); \
else \
err_cb(err_cb_data, (void *)decoded_struct, __FILE__, __LINE__, \
"tag 0x%x = %s: " FMT " (%d: %s)\n", \
(TAG_INST).tag, get_value_string(iei_strs, (TAG_INST).tag), ##ARGS, \
RC, strerror((RC) > 0 ? (RC) : -(RC))); \
} \
return RC; \
} while (0)
/* Reverse offsetof(): return the address of the struct member for a given parent struct and member offset value.
* \param parent Pointer to the parent struct, e.g. decoded_struct as passed to osmo_gtlvs_decode().
* \param parent_size sizeof(*parent), for memory bounds checking, e.g. decoded_struct_size.
* \param memb_ofs byte offset to reach a member (e.g. osmo_gtlv_coding.memb_ofs, .presence_flag_ofs, ...). */
static const void *membof_const(const void *parent, size_t parent_size, unsigned int memb_ofs)
{
const uint8_t *p = parent;
const uint8_t *end = p + parent_size;
const uint8_t *memb = p + memb_ofs;
OSMO_ASSERT(memb < end);
OSMO_ASSERT(memb >= p);
return memb;
}
static void *membof(void *parent, size_t parent_size, unsigned int memb_ofs)
{
return (void *)membof_const((const void *)parent, parent_size, memb_ofs);
}
/*! Decode a TLV structure from raw data to a decoded struct, for unordered TLV IEs.
* How to decode IE values and where to place them in the decoded struct, is defined by ie_coding, an array terminated
* by a '{}' entry.
* The IEs may appear in any ordering in the TLV data.
* For unordered decoding, only IEs with has_presence_flag == true or has_count == true may repeat. Other IE definitions
* cause the last read TLV to overwrite all previous decodings, all into the first occurrence in ie_coding.
* \param[out] decoded_struct Pointer to the struct to write parsed IE data to.
* \param[in] obj_ofs Pass as zero. Used for nested IEs: offset added to decoded_struct to get to a sub-struct.
* \param[in] gtlv TLV data to parse, as given in gtlv->msg.*. Must be ready for osmo_gtlv_load_start().
* \param[in] ie_coding A list of permitted/expected IEI tags and instructions for decoding.
* \param[in] err_cb Function to call to report an error message, or NULL.
* \param[in] err_cb_data Caller supplied context to pass to the err_cb as 'data' argument.
* \param[in] iei_strs value_string array to give IEI names in error messages passed to err_cb(), or NULL.
* \return 0 on success, negative on error.
*/
static int osmo_gtlvs_decode_unordered(void *decoded_struct, size_t decoded_struct_size,
unsigned int obj_ofs, struct osmo_gtlv_load *gtlv,
const struct osmo_gtlv_coding *ie_coding,
osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)
{
void *obj = membof(decoded_struct, decoded_struct_size, obj_ofs);
size_t obj_maxlen = decoded_struct_size - obj_ofs;
const struct osmo_gtlv_coding *iec;
unsigned int *multi_count_p = NULL;
/* To check for presence of mandatory IEs, need to keep a flag stack of seen ie_coding entries. This array has
* to have at least the nr of entries that the ie_coding array has. Let's allow up to this many ie_coding
* entries to avoid dynamic allocation. Seems like enough. */
bool seen_ie_coding_entries[4096] = {};
bool *seen_p;
#define CHECK_SEEN(IEC) do { \
unsigned int ie_coding_idx = (IEC) - ie_coding; \
if (ie_coding_idx >= ARRAY_SIZE(seen_ie_coding_entries)) \
RETURN_ERROR(-ENOTSUP, gtlv->ti, \
"Too many IE definitions for decoding an unordered TLV structure"); \
seen_p = &seen_ie_coding_entries[ie_coding_idx]; \
} while (0)
osmo_gtlv_load_start(gtlv);
/* IEs are allowed to come in any order. So traverse the TLV structure once, and find an IE parser for each (if
* any). */
for (;;) {
int rc;
bool *presence_flag_p;
unsigned int memb_next_array_idx;
unsigned int memb_ofs;
unsigned int ie_max_allowed_count;
rc = osmo_gtlv_load_next(gtlv);
if (rc)
RETURN_ERROR(rc, gtlv->ti, "Decoding IEs failed on or after this tag");
if (!gtlv->val) {
/* End of the TLV structure */
break;
}
/* ie_max_allowed_count counts how often the same IEI may appear in a message until all struct members
* that can store them are filled up. */
ie_max_allowed_count = 0;
do {
/* Find the IE coding for this tag */
for (iec = ie_coding;
!osmo_gtlv_coding_end(iec) && osmo_gtlv_tag_inst_cmp(&iec->ti, &gtlv->ti);
iec++);
/* No such IE coding found. */
if (osmo_gtlv_coding_end(iec))
break;
/* Keep track how often this tag can occur */
ie_max_allowed_count += iec->has_count ? iec->count_max : 1;
/* Was this iec instance already decoded? Then skip to the next one, if any. */
presence_flag_p = iec->has_presence_flag ?
membof(obj, obj_maxlen, iec->presence_flag_ofs) : NULL;
multi_count_p = iec->has_count ?
membof(obj, obj_maxlen, iec->count_ofs) : NULL;
if ((presence_flag_p && *presence_flag_p)
|| (multi_count_p && *multi_count_p >= iec->count_max))
continue;
/* For IEs with a presence flag or a multi count, the decoded struct provides the information
* whether the IE has already been decoded. Do the same for mandatory IEs, using local state in
* seen_ie_coding_entries[]. */
CHECK_SEEN(iec);
if (*seen_p)
continue;
} while (0);
if (osmo_gtlv_coding_end(iec)) {
if (ie_max_allowed_count) {
/* There have been IE definitions for this IEI, but all slots to decode it are already
* filled. */
RETURN_ERROR(-ENOTSUP, gtlv->ti, "Only %u instances of this IE are supported per message",
ie_max_allowed_count);
}
/* No such IE defined in ie_coding, just skip the TLV. */
continue;
}
/* If this is a repeated IE, decode into the correct array index memb[idx],
* next idx == (*multi_count_p). We've already guaranteed above that *multi_count_p < count_max. */
memb_next_array_idx = multi_count_p ? *multi_count_p : 0;
memb_ofs = iec->memb_ofs + memb_next_array_idx * iec->memb_array_pitch;
/* Decode IE value part */
if (iec->nested_ies) {
/* A nested IE: the value part of this TLV is in turn a TLV structure. Decode the inner
* IEs. */
struct osmo_gtlv_load inner_tlv = {
.cfg = iec->nested_ies_cfg ? : gtlv->cfg,
.src = {
.data = gtlv->val,
.len = gtlv->len,
}
};
bool ordered;
switch (iec->nested_ies_ordered) {
case OSMO_GTLV_NESTED_IES_ORDERED:
ordered = true;
break;
case OSMO_GTLV_NESTED_IES_ORDERING_SAME:
case OSMO_GTLV_NESTED_IES_UNORDERED:
ordered = false;
break;
default:
OSMO_ASSERT(0);
}
rc = osmo_gtlvs_decode(decoded_struct, decoded_struct_size,
obj_ofs + memb_ofs, &inner_tlv, ordered, iec->nested_ies,
err_cb, err_cb_data, iei_strs);
if (rc)
RETURN_ERROR(rc, gtlv->ti, "Error while decoding TLV structure nested inside this IE");
} else {
/* Normal IE, decode the specific IE data. */
if (!iec->dec_func)
RETURN_ERROR(-EIO, gtlv->ti, "IE definition lacks a dec_func()");
rc = iec->dec_func(decoded_struct, membof(obj, obj_maxlen, memb_ofs), gtlv);
if (rc)
RETURN_ERROR(rc, gtlv->ti, "Error while decoding this IE");
}
if (multi_count_p) {
/* A repeated IE, record that we've added one entry. This increments the foo_count value in the
* decoded osmo_gtlv_msg.ies.*.
* For example, multi_count_p points at osmo_gtlv_msg_session_est_req.create_pdr_count,
* and memb_ofs points at osmo_gtlv_msg_session_est_req.create_pdr. */
(*multi_count_p)++;
}
if (presence_flag_p) {
*presence_flag_p = true;
}
CHECK_SEEN(iec);
*seen_p = true;
}
/* Check presence of mandatory IEs */
for (iec = ie_coding; !osmo_gtlv_coding_end(iec); iec++) {
if (iec->has_presence_flag)
continue;
multi_count_p = iec->has_count ? membof(obj, obj_maxlen, iec->count_ofs) : NULL;
if (multi_count_p) {
if (*multi_count_p < iec->count_mandatory)
RETURN_ERROR(-EINVAL, iec->ti, "%u instances of this IE are mandatory, got %u",
iec->count_mandatory, *multi_count_p);
continue;
}
/* Neither an optional nor a multi member, hence it must be mandatory. */
CHECK_SEEN(iec);
if (!*seen_p)
RETURN_ERROR(-EINVAL, iec->ti, "Missing mandatory IE");
}
return 0;
}
/*! Decode a TLV structure from raw data to a decoded struct, for ordered TLV IEs.
* How to decode IE values and where to place them in the decoded struct, is defined by ie_coding, an array terminated
* by a '{}' entry.
* The IEs in the TLV structure must appear in the same order as they are defined in ie_coding.
* cause the last read TLV to overwrite all previous decodings, all into the first occurrence in ie_coding.
* \param[out] decoded_struct Pointer to the struct to write parsed IE data to.
* \param[in] obj_ofs Pass as zero. Used for nested IEs: offset added to decoded_struct to get to a sub-struct.
* \param[in] gtlv TLV data to parse, as given in gtlv->msg.*. Must be ready for osmo_gtlv_load_start().
* \param[in] ie_coding A list of permitted/expected IEI tags and instructions for decoding.
* \param[in] err_cb Function to call to report an error message, or NULL.
* \param[in] err_cb_data Caller supplied context to pass to the err_cb as 'data' argument.
* \param[in] iei_strs value_string array to give IEI names in error messages passed to err_cb(), or NULL.
* \return 0 on success, negative on error.
*/
static int osmo_gtlvs_decode_ordered(void *decoded_struct, size_t decoded_struct_size,
unsigned int obj_ofs, struct osmo_gtlv_load *gtlv,
const struct osmo_gtlv_coding *ie_coding,
osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)
{
void *obj = membof(decoded_struct, decoded_struct_size, obj_ofs);
size_t obj_maxlen = decoded_struct_size - obj_ofs;
osmo_gtlv_load_start(gtlv);
for (; !osmo_gtlv_coding_end(ie_coding); ie_coding++) {
int rc;
bool *presence_flag = ie_coding->has_presence_flag ?
membof(obj, obj_maxlen, ie_coding->presence_flag_ofs) : NULL;
unsigned int *multi_count = ie_coding->has_count ?
membof(obj, obj_maxlen, ie_coding->count_ofs) : NULL;
struct osmo_gtlv_tag_inst peek_ti;
rc = osmo_gtlv_load_next_by_tag_inst(gtlv, &ie_coding->ti);
switch (rc) {
case 0:
break;
case -ENOENT:
if (!presence_flag && (!multi_count || *multi_count < ie_coding->count_mandatory))
RETURN_ERROR(rc, ie_coding->ti, "Missing mandatory IE");
if (presence_flag)
*presence_flag = false;
continue;
default:
RETURN_ERROR(rc, ie_coding->ti, "Error in TLV structure");
}
for (;;) {
/* If this is a repeated IE, decode into the correct array index memb[idx],
* next idx == (*multi_count) */
unsigned int memb_next_array_idx = multi_count ? *multi_count : 0;
unsigned int memb_ofs = ie_coding->memb_ofs + memb_next_array_idx * ie_coding->memb_array_pitch;
if (multi_count && memb_next_array_idx >= ie_coding->count_max)
RETURN_ERROR(-ENOTSUP, ie_coding->ti, "Only %u instances of this IE are supported per message",
ie_coding->count_max);
/* Decode IE value part */
if (ie_coding->nested_ies) {
/* A nested IE: the value part of this TLV is in turn a TLV structure. Decode the inner
* IEs. */
struct osmo_gtlv_load inner_tlv = {
.cfg = ie_coding->nested_ies_cfg ? : gtlv->cfg,
.src = {
.data = gtlv->val,
.len = gtlv->len,
}
};
bool ordered;
switch (ie_coding->nested_ies_ordered) {
case OSMO_GTLV_NESTED_IES_ORDERING_SAME:
case OSMO_GTLV_NESTED_IES_ORDERED:
ordered = true;
break;
case OSMO_GTLV_NESTED_IES_UNORDERED:
ordered = false;
break;
default:
OSMO_ASSERT(0);
}
rc = osmo_gtlvs_decode(decoded_struct, decoded_struct_size,
obj_ofs + memb_ofs, &inner_tlv, ordered, ie_coding->nested_ies,
err_cb, err_cb_data, iei_strs);
if (rc)
RETURN_ERROR(rc, ie_coding->ti,
"Error while decoding TLV structure nested inside this IE");
} else {
/* Normal IE, decode the specific IE data. */
if (!ie_coding->dec_func)
RETURN_ERROR(-EIO, ie_coding->ti, "IE definition lacks a dec_func()");
rc = ie_coding->dec_func(decoded_struct, membof(obj, obj_maxlen, memb_ofs), gtlv);
if (rc)
RETURN_ERROR(rc, ie_coding->ti, "Error while decoding this IE");
}
if (presence_flag)
*presence_flag = true;
if (!multi_count) {
/* Not a repeated IE. */
break;
}
/* A repeated IE, record that we've added one entry. This increments the foo_count value in the
* decoded osmo_pfcp_msg.ies.*.
* For example, multi_count points at osmo_pfcp_msg_session_est_req.create_pdr_count,
* and memb_ofs points at osmo_pfcp_msg_session_est_req.create_pdr. */
(*multi_count)++;
/* Does another one of these IEs follow? */
if (osmo_gtlv_load_peek_tag(gtlv, &peek_ti)
|| osmo_gtlv_tag_inst_cmp(&peek_ti, &gtlv->ti)) {
/* Next tag is a different IE, end the repetition. */
break;
}
/* continue, parsing the next repetition of this tag. */
rc = osmo_gtlv_load_next(gtlv);
if (rc)
return rc;
}
/* continue parsing the next tag. */
}
return 0;
}
/*! Decode an entire TLV message from raw data to decoded struct.
* How to decode IE values and where to put them in the decoded struct is defined by ie_coding, an array terminated by
* a '{}' entry.
* \param[out] decoded_struct Pointer to the struct to write parsed IE data to.
* \param[in] obj_ofs Pass as zero. Used for nested IEs: offset added to decoded_struct to get to a sub-struct.
* \param[in] gtlv TLV data to parse, as given in gtlv->msg.*. Must be ready for osmo_gtlv_load_start().
* \param[in] ie_coding A list of permitted/expected IEI tags and instructions for decoding.
* \param[in] err_cb Function to call to report an error message, or NULL.
* \param[in] err_cb_data Caller supplied context to pass to the err_cb as 'data' argument.
* \param[in] iei_strs value_string array to give IEI names in error messages passed to err_cb(), or NULL.
* \return 0 on success, negative on error.
*/
int osmo_gtlvs_decode(void *decoded_struct, size_t decoded_struct_size,
unsigned int obj_ofs, struct osmo_gtlv_load *gtlv, bool tlv_ordered,
const struct osmo_gtlv_coding *ie_coding,
osmo_gtlv_err_cb err_cb, void *err_cb_data, const struct value_string *iei_strs)
{
if (!ie_coding)
return -ENOTSUP;
if (tlv_ordered)
return osmo_gtlvs_decode_ordered(decoded_struct, decoded_struct_size, obj_ofs, gtlv, ie_coding,
err_cb, err_cb_data, iei_strs);
else
return osmo_gtlvs_decode_unordered(decoded_struct, decoded_struct_size, obj_ofs, gtlv, ie_coding,
err_cb, err_cb_data, iei_strs);
}
/*! Encode a TLV structure from decoded struct to raw data.
* How to encode IE values and where to read them in the decoded struct is defined by ie_coding, an array terminated by
* a '{}' entry.
* The IEs will be encoded in the order they appear in ie_coding.
* \param[out] gtlv Write data using this TLV definition to gtlv->dst.
* \param[in] decoded_struct C struct data to encode.
* \param[in] obj_ofs Nesting offset, pass as 0.
* \param[in] ie_coding A {} terminated list of IEI tags to encode (if present) and instructions for encoding.
* \param[in] err_cb Function to call to report an error message, or NULL.
* \param[in] err_cb_data Caller supplied context to pass to the err_cb as 'data' argument.
* \param[in] iei_strs value_string array to give IEI names in error messages passed to err_cb(), or NULL.
* \return 0 on success, negative on error.
*/
int osmo_gtlvs_encode(struct osmo_gtlv_put *gtlv, const void *decoded_struct, size_t decoded_struct_size,
unsigned int obj_ofs, const struct osmo_gtlv_coding *ie_coding, osmo_gtlv_err_cb err_cb,
void *err_cb_data, const struct value_string *iei_strs)
{
const void *obj = membof_const(decoded_struct, decoded_struct_size, obj_ofs);
size_t obj_maxlen = decoded_struct_size - obj_ofs;
if (!ie_coding)
return -ENOTSUP;
for (; !osmo_gtlv_coding_end(ie_coding); ie_coding++) {
int rc;
const bool *presence_flag_p = ie_coding->has_presence_flag ?
membof_const(obj, obj_maxlen, ie_coding->presence_flag_ofs) : NULL;
const unsigned int *multi_count_p = ie_coding->has_count ?
membof_const(obj, obj_maxlen, ie_coding->count_ofs) : NULL;
unsigned int n;
unsigned int i;
if (presence_flag_p && !*presence_flag_p)
continue;
if (multi_count_p) {
n = *multi_count_p;
if (!ie_coding->memb_array_pitch)
RETURN_ERROR(-EFAULT, ie_coding->ti,
"Error in protocol definition: The ie_coding lacks a memb_array_pitch"
" value, cannot be used as multi-IE\n");
} else {
n = 1;
}
for (i = 0; i < n; i++) {
unsigned int memb_ofs;
osmo_gtlv_put_tli(gtlv, &ie_coding->ti, 0);
/* If this is a repeated IE, encode from the correct array index */
if (multi_count_p && i >= ie_coding->count_max)
RETURN_ERROR(-ENOTSUP, ie_coding->ti,
"Only %u instances of this IE are supported per message", ie_coding->count_max);
memb_ofs = ie_coding->memb_ofs + i * ie_coding->memb_array_pitch;
if (ie_coding->nested_ies) {
struct osmo_gtlv_put nested_tlv = {
.cfg = ie_coding->nested_ies_cfg ? : gtlv->cfg,
.dst = gtlv->dst,
};
rc = osmo_gtlvs_encode(&nested_tlv, decoded_struct, decoded_struct_size,
obj_ofs + memb_ofs, ie_coding->nested_ies,
err_cb, err_cb_data, iei_strs);
if (rc)
RETURN_ERROR(rc, ie_coding->ti,
"Error while encoding TLV structure nested inside this IE");
} else {
rc = ie_coding->enc_func(gtlv, decoded_struct, membof_const(obj, obj_maxlen, memb_ofs));
if (rc)
RETURN_ERROR(rc, ie_coding->ti, "Error while encoding this IE");
}
osmo_gtlv_put_update_tl(gtlv);
}
}
return 0;
}
/*! Compose a human readable string describing a decoded struct.
* How to encode IE values and where to read them in the decoded struct is defined by ie_coding, an array terminated by
* a '{}' entry.
* The IEs will be encoded in the order they appear in ie_coding.
* \param[out] buf Return the string in this buffer.
* \param[in] buflen Size of buf.
* \param[in] decoded_struct C struct data to encode.
* \param[in] obj_ofs Nesting offset, pass as 0.
* \param[in] ie_coding A {} terminated list of IEI tags to encode (if present) and instructions for encoding.
* \param[in] iei_strs value_string array to give IEI names in tag headers, or NULL.
* \return number of characters that would be written if the buffer is large enough, like snprintf().
*/
int osmo_gtlvs_encode_to_str_buf(char *buf, size_t buflen,
const void *decoded_struct, size_t decoded_struct_size, unsigned int obj_ofs,
const struct osmo_gtlv_coding *ie_coding, const struct value_string *iei_strs)
{
struct osmo_strbuf sb = { .buf = buf, .len = buflen };
const void *obj = membof_const(decoded_struct, decoded_struct_size, obj_ofs);
size_t obj_maxlen = decoded_struct_size - obj_ofs;
if (!ie_coding)
return -ENOTSUP;
for (; !osmo_gtlv_coding_end(ie_coding); ie_coding++) {
const bool *presence_flag_p = ie_coding->has_presence_flag ?
membof_const(obj, obj_maxlen, ie_coding->presence_flag_ofs) : NULL;
const unsigned int *multi_count_p = ie_coding->has_count ?
membof_const(obj, obj_maxlen, ie_coding->count_ofs) : NULL;
unsigned int n;
unsigned int i;
if (presence_flag_p && !*presence_flag_p)
continue;
if (multi_count_p) {
n = *multi_count_p;
} else {
n = 1;
}
if (!n)
continue;
OSMO_STRBUF_PRINTF(sb, " '%s'=", get_value_string(iei_strs, ie_coding->ti.tag));
if (multi_count_p)
OSMO_STRBUF_PRINTF(sb, "{ ");
for (i = 0; i < n; i++) {
unsigned int memb_ofs;
/* If this is a repeated IE, encode from the correct array index */
if (multi_count_p && i >= ie_coding->count_max)
return -ENOTSUP;
if (i > 0)
OSMO_STRBUF_PRINTF(sb, ", ");
memb_ofs = ie_coding->memb_ofs + i * ie_coding->memb_array_pitch;
if (ie_coding->nested_ies) {
OSMO_STRBUF_PRINTF(sb, "{");
OSMO_STRBUF_APPEND(sb, osmo_gtlvs_encode_to_str_buf,
decoded_struct, decoded_struct_size, obj_ofs + memb_ofs,
ie_coding->nested_ies, iei_strs);
OSMO_STRBUF_PRINTF(sb, " }");
} else {
if (ie_coding->enc_to_str_func)
OSMO_STRBUF_APPEND(sb, ie_coding->enc_to_str_func,
membof_const(obj, obj_maxlen, memb_ofs));
else
OSMO_STRBUF_PRINTF(sb, "(enc_to_str_func==NULL)");
}
}
if (multi_count_p)
OSMO_STRBUF_PRINTF(sb, " }");
}
return sb.chars_needed;
}
/*! Compose a human readable string describing a decoded struct.
* Like osmo_gtlvs_encode_to_str_buf() but returns a talloc allocated string.
* \param[in] ctx talloc context to allocate from, e.g. OTC_SELECT.
* \param[in] decoded_struct C struct data to encode.
* \param[in] obj_ofs Nesting offset, pass as 0.
* \param[in] ie_coding A {} terminated list of IEI tags to encode (if present) and instructions for encoding.
* \param[in] iei_strs value_string array to give IEI names in tag headers, or NULL.
* \return human readable string.
*/
char *osmo_gtlvs_encode_to_str_c(void *ctx,
const void *decoded_struct, size_t decoded_struct_size, unsigned int obj_ofs,
const struct osmo_gtlv_coding *ie_coding, const struct value_string *iei_strs)
{
OSMO_NAME_C_IMPL(ctx, 256, "ERROR", osmo_gtlvs_encode_to_str_buf, decoded_struct, decoded_struct_size,
obj_ofs, ie_coding, iei_strs)
}
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