[mirror_frr.git] / pceplib / pcep_msg_messages_encoding.c

/*
 * This file is part of the PCEPlib, a PCEP protocol library.
 *
 * Copyright (C) 2020 Volta Networks https://voltanet.io/
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Author : Brady Johnson <brady@voltanet.io>
 *
 */


/*
 * Encoding and decoding for PCEP messages.
 */

#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "pcep_msg_encoding.h"
#include "pcep_msg_messages.h"
#include "pcep_msg_objects.h"
#include "pcep_msg_tools.h"
#include "pcep_utils_logging.h"
#include "pcep_utils_memory.h"

#define ANY_OBJECT 0
#define NO_OBJECT -1
#define NUM_CHECKED_OBJECTS 4
/* It wont compile with this definition:
   static const int
   MANDATORY_MESSAGE_OBJECT_CLASSES[PCEP_TYPE_INITIATE+1][NUM_CHECKED_OBJECTS]
 */
static const enum pcep_object_classes MANDATORY_MESSAGE_OBJECT_CLASSES[13][4] =
	{
		{NO_OBJECT, NO_OBJECT, NO_OBJECT,
		 NO_OBJECT}, /* unsupported message ID = 0 */
		{PCEP_OBJ_CLASS_OPEN, NO_OBJECT, NO_OBJECT,
		 NO_OBJECT}, /* PCEP_TYPE_OPEN = 1 */
		{NO_OBJECT, NO_OBJECT, NO_OBJECT,
		 NO_OBJECT}, /* PCEP_TYPE_KEEPALIVE = 2 */
		{PCEP_OBJ_CLASS_RP, PCEP_OBJ_CLASS_ENDPOINTS, ANY_OBJECT,
		 ANY_OBJECT}, /* PCEP_TYPE_PCREQ = 3 */
		{PCEP_OBJ_CLASS_RP, ANY_OBJECT, ANY_OBJECT,
		 ANY_OBJECT}, /* PCEP_TYPE_PCREP = 4 */
		{PCEP_OBJ_CLASS_NOTF, ANY_OBJECT, ANY_OBJECT,
		 ANY_OBJECT}, /* PCEP_TYPE_PCNOTF = 5 */
		{PCEP_OBJ_CLASS_ERROR, ANY_OBJECT, ANY_OBJECT,
		 ANY_OBJECT}, /* PCEP_TYPE_ERROR = 6 */
		{PCEP_OBJ_CLASS_CLOSE, NO_OBJECT, NO_OBJECT,
		 NO_OBJECT}, /* PCEP_TYPE_CLOSE = 7 */
		{NO_OBJECT, NO_OBJECT, NO_OBJECT,
		 NO_OBJECT}, /* unsupported message ID = 8 */
		{NO_OBJECT, NO_OBJECT, NO_OBJECT,
		 NO_OBJECT}, /* unsupported message ID = 9 */
		{PCEP_OBJ_CLASS_SRP, PCEP_OBJ_CLASS_LSP, ANY_OBJECT,
		 ANY_OBJECT}, /* PCEP_TYPE_REPORT = 10 */
		{PCEP_OBJ_CLASS_SRP, PCEP_OBJ_CLASS_LSP, ANY_OBJECT,
		 ANY_OBJECT}, /* PCEP_TYPE_UPDATE = 11 */
		{PCEP_OBJ_CLASS_SRP, PCEP_OBJ_CLASS_LSP, ANY_OBJECT,
		 ANY_OBJECT}, /* PCEP_TYPE_INITIATE = 12 */
};

/* PCEP Message Common Header, According to RFC 5440
 *
 *   0                   1                   2                   3
 *   0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *  | Ver |  Flags  |  Message-Type |       Message-Length          |
 *  +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 *
 * Ver (Version - 3 bits):  PCEP version number. Current version is version 1.
 *
 * Flags (5 bits):  No flags are currently defined. Unassigned bits are
 *    considered as reserved.  They MUST be set to zero on transmission
 *    and MUST be ignored on receipt.
 */
void pcep_encode_message(struct pcep_message *message,
			 struct pcep_versioning *versioning)
{
	if (message == NULL) {
		return;
	}

	if (message->msg_header == NULL) {
		return;
	}

	/* Internal buffer used for the entire message. Later, once the entire
	 * length is known, memory will be allocated and this buffer will be
	 * copied. */
	uint8_t message_buffer[PCEP_MESSAGE_LENGTH] = {0};

	/* Write the message header. The message header length will be
	 * written when the entire length is known. */
	uint32_t message_length = MESSAGE_HEADER_LENGTH;
	uint16_t net_order_length = 0;
	message_buffer[0] = (message->msg_header->pcep_version << 5) & 0xf0;
	message_buffer[1] = message->msg_header->type;

	if (message->obj_list == NULL) {
		net_order_length = htons(message_length);
		memcpy(message_buffer + 2, &net_order_length,
		       sizeof(net_order_length));
		message->encoded_message =
			pceplib_malloc(PCEPLIB_MESSAGES, message_length);
		memcpy(message->encoded_message, message_buffer,
		       message_length);
		message->encoded_message_length = message_length;

		return;
	}

	/* Encode each of the objects */
	double_linked_list_node *node = message->obj_list->head;
	for (; node != NULL; node = node->next_node) {
		message_length +=
			pcep_encode_object(node->data, versioning,
					   message_buffer + message_length);
		if (message_length > PCEP_MESSAGE_LENGTH) {
			message->encoded_message = NULL;
			message->encoded_message_length = 0;
			return;
		}
	}

	net_order_length = htons(message_length);
	memcpy(message_buffer + 2, &net_order_length, sizeof(net_order_length));
	message->encoded_message =
		pceplib_malloc(PCEPLIB_MESSAGES, message_length);
	memcpy(message->encoded_message, message_buffer, message_length);
	message->encoded_message_length = message_length;
}

/*
 * Decoding functions
 */

/* Expecting Host byte ordered header */
static bool validate_msg_header(uint8_t msg_version, uint8_t msg_flags,
				uint8_t msg_type, uint16_t msg_length)
{
	/* Invalid message if the length is less than the header
	 * size or if its not a multiple of 4 */
	if (msg_length < MESSAGE_HEADER_LENGTH || (msg_length % 4) != 0) {
		pcep_log(LOG_INFO,
			 "%s: Invalid PCEP message header length [%d]",
			 __func__, msg_length);
		return false;
	}

	if (msg_version != PCEP_MESSAGE_HEADER_VERSION) {
		pcep_log(
			LOG_INFO,
			"%s: Invalid PCEP message header version [0x%x] expected version [0x%x]",
			__func__, msg_version, PCEP_MESSAGE_HEADER_VERSION);
		return false;
	}

	if (msg_flags != 0) {
		pcep_log(LOG_INFO,
			 "%s: Invalid PCEP message header flags [0x%x]",
			 __func__, msg_flags);
		return false;
	}

	switch (msg_type) {
	/* Supported message types */
	case PCEP_TYPE_OPEN:
	case PCEP_TYPE_KEEPALIVE:
	case PCEP_TYPE_PCREQ:
	case PCEP_TYPE_PCREP:
	case PCEP_TYPE_PCNOTF:
	case PCEP_TYPE_ERROR:
	case PCEP_TYPE_CLOSE:
	case PCEP_TYPE_REPORT:
	case PCEP_TYPE_UPDATE:
	case PCEP_TYPE_INITIATE:
		break;
	default:
		pcep_log(LOG_INFO, "%s: Invalid PCEP message header type [%d]",
			 __func__, msg_type);
		return false;
		break;
	}

	return true;
}

/* Internal util function */
static uint16_t pcep_decode_msg_header(const uint8_t *msg_buf,
				       uint8_t *msg_version, uint8_t *msg_flags,
				       uint8_t *msg_type)
{
	// Check RFC 5440 for version and flags position.
	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
	//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	//| Ver | Flags   | Message-Type  |  Message-Length               |
	//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
	*msg_version = (msg_buf[0] >> 5) & 0x07;
	*msg_flags = (msg_buf[0] & 0x1f);
	*msg_type = msg_buf[1];
	uint16_t host_order_length;
	memcpy(&host_order_length, msg_buf + 2, sizeof(host_order_length));
	return ntohs(host_order_length);
}

/* Decode the message header and return the message length */
int32_t pcep_decode_validate_msg_header(const uint8_t *msg_buf)
{
	uint8_t msg_version;
	uint8_t msg_flags;
	uint8_t msg_type;
	uint32_t msg_length;

	msg_length = pcep_decode_msg_header(msg_buf, &msg_version, &msg_flags,
					    &msg_type);

	return ((validate_msg_header(msg_version, msg_flags, msg_type,
				     msg_length)
		 == false)
			? -1
			: (int32_t)msg_length);
}

bool validate_message_objects(struct pcep_message *msg)
{
	if (msg->msg_header->type >= PCEP_TYPE_START_TLS) {
		pcep_log(
			LOG_INFO,
			"%s: Rejecting received message: Unknown message type [%d]",
			__func__, msg->msg_header->type);
		return false;
	}

	const enum pcep_object_classes *object_classes =
		MANDATORY_MESSAGE_OBJECT_CLASSES[msg->msg_header->type];
	double_linked_list_node *node;
	int index;
	for (node = (msg->obj_list == NULL ? NULL : msg->obj_list->head),
	    index = 0;
	     index < NUM_CHECKED_OBJECTS;
	     index++, (node = (node == NULL ? NULL : node->next_node))) {
		struct pcep_object_header *obj =
			((node == NULL)
				 ? NULL
				 : (struct pcep_object_header *)node->data);

		if ((int)object_classes[index] == NO_OBJECT) {
			if (node != NULL) {
				pcep_log(
					LOG_INFO,
					"%s: Rejecting received message: Unexpected object [%d] present",
					__func__, obj->object_class);
				return false;
			}
		} else if (object_classes[index] != ANY_OBJECT) {
			if (node == NULL) {
				pcep_log(
					LOG_INFO,
					"%s: Rejecting received message: Expecting object in position [%d], but none received",
					__func__, index);
				return false;
			} else if (object_classes[index] != obj->object_class) {
				pcep_log(
					LOG_INFO,
					"%s: Rejecting received message: Unexpected Object Class received [%d]",
					__func__, object_classes[index]);
				return false;
			}
		}
	}

	return true;
}

struct pcep_message *pcep_decode_message(const uint8_t *msg_buf)
{
	uint8_t msg_version;
	uint8_t msg_flags;
	uint8_t msg_type;
	uint16_t msg_length;

	msg_length = pcep_decode_msg_header(msg_buf, &msg_version, &msg_flags,
					    &msg_type);

	struct pcep_message *msg =
		pceplib_calloc(PCEPLIB_MESSAGES, sizeof(struct pcep_message));

	msg->msg_header = pceplib_malloc(PCEPLIB_MESSAGES,
					 sizeof(struct pcep_message_header));
	msg->msg_header->pcep_version = msg_version;
	msg->msg_header->type = msg_type;

	msg->obj_list = dll_initialize();
	msg->encoded_message = pceplib_malloc(PCEPLIB_MESSAGES, msg_length);
	memcpy(msg->encoded_message, msg_buf, msg_length);
	msg->encoded_message_length = msg_length;

	uint16_t bytes_read = MESSAGE_HEADER_LENGTH;
	while ((msg_length - bytes_read) >= OBJECT_HEADER_LENGTH) {
		struct pcep_object_header *obj_hdr =
			pcep_decode_object(msg_buf + bytes_read);

		if (obj_hdr == NULL) {
			pcep_log(LOG_INFO, "%s: Discarding invalid message",
				 __func__);
			pcep_msg_free_message(msg);

			return NULL;
		}

		dll_append(msg->obj_list, obj_hdr);
		bytes_read += obj_hdr->encoded_object_length;
	}

	if (validate_message_objects(msg) == false) {
		pcep_log(LOG_INFO, "%s: Discarding invalid message", __func__);
		pcep_msg_free_message(msg);

		return NULL;
	}

	return msg;
}

struct pcep_versioning *create_default_pcep_versioning()
{
	struct pcep_versioning *versioning =
		pceplib_malloc(PCEPLIB_INFRA, sizeof(struct pcep_versioning));
	memset(versioning, 0, sizeof(struct pcep_versioning));

	return versioning;
}

void destroy_pcep_versioning(struct pcep_versioning *versioning)
{
	pceplib_free(PCEPLIB_INFRA, versioning);
}
Commit	Line	Data
74971473 JG	1	/*
	2	* This file is part of the PCEPlib, a PCEP protocol library.
	3	*
	4	* Copyright (C) 2020 Volta Networks https://voltanet.io/
	5	*
	6	* This library is free software; you can redistribute it and/or
	7	* modify it under the terms of the GNU Lesser General Public
	8	* License as published by the Free Software Foundation; either
	9	* version 2 of the License, or (at your option) any later version.
	10	*
	11	* This library is distributed in the hope that it will be useful,
	12	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	13	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	14	* Lesser General Public License for more details.
	15	*
	16	* You should have received a copy of the GNU Lesser General Public License
	17	* along with this program. If not, see <https://www.gnu.org/licenses/>.
	18	*
	19	* Author : Brady Johnson <brady@voltanet.io>
	20	*
	21	*/
	22
	23
	24	/*
	25	* Encoding and decoding for PCEP messages.
	26	*/
	27
	28	#include <stdlib.h>
	29	#include <string.h>
	30	#include <unistd.h>
	31
	32	#include "pcep_msg_encoding.h"
	33	#include "pcep_msg_messages.h"
	34	#include "pcep_msg_objects.h"
	35	#include "pcep_msg_tools.h"
	36	#include "pcep_utils_logging.h"
	37	#include "pcep_utils_memory.h"
	38
	39	#define ANY_OBJECT 0
	40	#define NO_OBJECT -1
	41	#define NUM_CHECKED_OBJECTS 4
	42	/* It wont compile with this definition:
	43	static const int
	44	MANDATORY_MESSAGE_OBJECT_CLASSES[PCEP_TYPE_INITIATE+1][NUM_CHECKED_OBJECTS]
	45	*/
	46	static const enum pcep_object_classes MANDATORY_MESSAGE_OBJECT_CLASSES[13][4] =
	47	{
	48	{NO_OBJECT, NO_OBJECT, NO_OBJECT,
	49	NO_OBJECT}, /* unsupported message ID = 0 */
	50	{PCEP_OBJ_CLASS_OPEN, NO_OBJECT, NO_OBJECT,
	51	NO_OBJECT}, /* PCEP_TYPE_OPEN = 1 */
	52	{NO_OBJECT, NO_OBJECT, NO_OBJECT,
	53	NO_OBJECT}, /* PCEP_TYPE_KEEPALIVE = 2 */
	54	{PCEP_OBJ_CLASS_RP, PCEP_OBJ_CLASS_ENDPOINTS, ANY_OBJECT,
	55	ANY_OBJECT}, /* PCEP_TYPE_PCREQ = 3 */
	56	{PCEP_OBJ_CLASS_RP, ANY_OBJECT, ANY_OBJECT,
	57	ANY_OBJECT}, /* PCEP_TYPE_PCREP = 4 */
	58	{PCEP_OBJ_CLASS_NOTF, ANY_OBJECT, ANY_OBJECT,
	59	ANY_OBJECT}, /* PCEP_TYPE_PCNOTF = 5 */
	60	{PCEP_OBJ_CLASS_ERROR, ANY_OBJECT, ANY_OBJECT,
	61	ANY_OBJECT}, /* PCEP_TYPE_ERROR = 6 */
	62	{PCEP_OBJ_CLASS_CLOSE, NO_OBJECT, NO_OBJECT,
	63	NO_OBJECT}, /* PCEP_TYPE_CLOSE = 7 */
	64	{NO_OBJECT, NO_OBJECT, NO_OBJECT,
65	NO_OBJECT}, /* unsupported message ID = 8 */
66	{NO_OBJECT, NO_OBJECT, NO_OBJECT,
67	NO_OBJECT}, /* unsupported message ID = 9 */
68	{PCEP_OBJ_CLASS_SRP, PCEP_OBJ_CLASS_LSP, ANY_OBJECT,
69	ANY_OBJECT}, /* PCEP_TYPE_REPORT = 10 */
70	{PCEP_OBJ_CLASS_SRP, PCEP_OBJ_CLASS_LSP, ANY_OBJECT,
71	ANY_OBJECT}, /* PCEP_TYPE_UPDATE = 11 */
72	{PCEP_OBJ_CLASS_SRP, PCEP_OBJ_CLASS_LSP, ANY_OBJECT,
73	ANY_OBJECT}, /* PCEP_TYPE_INITIATE = 12 */
74	};
75
76	/* PCEP Message Common Header, According to RFC 5440
77	*
78	* 0 1 2 3
79	* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
80	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
81	* \| Ver \| Flags \| Message-Type \| Message-Length \|
82	* +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
83	*
84	* Ver (Version - 3 bits): PCEP version number. Current version is version 1.
85	*
86	* Flags (5 bits): No flags are currently defined. Unassigned bits are
87	* considered as reserved. They MUST be set to zero on transmission
88	* and MUST be ignored on receipt.
89	*/
90	void pcep_encode_message(struct pcep_message *message,
91	struct pcep_versioning *versioning)
92	{
93	if (message == NULL) {
94	return;
95	}
96
97	if (message->msg_header == NULL) {
98	return;
99	}
100
101	/* Internal buffer used for the entire message. Later, once the entire
102	* length is known, memory will be allocated and this buffer will be
103	* copied. */
104	uint8_t message_buffer[PCEP_MESSAGE_LENGTH] = {0};
105
106	/* Write the message header. The message header length will be
107	* written when the entire length is known. */
108	uint32_t message_length = MESSAGE_HEADER_LENGTH;
109	uint16_t net_order_length = 0;
110	message_buffer[0] = (message->msg_header->pcep_version << 5) & 0xf0;
111	message_buffer[1] = message->msg_header->type;
112
113	if (message->obj_list == NULL) {
114	net_order_length = htons(message_length);
115	memcpy(message_buffer + 2, &net_order_length,
116	sizeof(net_order_length));
117	message->encoded_message =
118	pceplib_malloc(PCEPLIB_MESSAGES, message_length);
119	memcpy(message->encoded_message, message_buffer,
120	message_length);
121	message->encoded_message_length = message_length;
122
123	return;
124	}
125
126	/* Encode each of the objects */
127	double_linked_list_node *node = message->obj_list->head;
128	for (; node != NULL; node = node->next_node) {
129	message_length +=
130	pcep_encode_object(node->data, versioning,
131	message_buffer + message_length);
132	if (message_length > PCEP_MESSAGE_LENGTH) {
133	message->encoded_message = NULL;
134	message->encoded_message_length = 0;
135	return;
136	}
137	}
138
139	net_order_length = htons(message_length);
140	memcpy(message_buffer + 2, &net_order_length, sizeof(net_order_length));
141	message->encoded_message =
142	pceplib_malloc(PCEPLIB_MESSAGES, message_length);
143	memcpy(message->encoded_message, message_buffer, message_length);
144	message->encoded_message_length = message_length;
145	}
146
147	/*
148	* Decoding functions
149	*/
150
151	/* Expecting Host byte ordered header */
152	static bool validate_msg_header(uint8_t msg_version, uint8_t msg_flags,
153	uint8_t msg_type, uint16_t msg_length)
154	{
155	/* Invalid message if the length is less than the header
156	* size or if its not a multiple of 4 */
157	if (msg_length < MESSAGE_HEADER_LENGTH \|\| (msg_length % 4) != 0) {
158	pcep_log(LOG_INFO,
159	"%s: Invalid PCEP message header length [%d]",
160	__func__, msg_length);
161	return false;
162	}
163
164	if (msg_version != PCEP_MESSAGE_HEADER_VERSION) {
165	pcep_log(
166	LOG_INFO,
167	"%s: Invalid PCEP message header version [0x%x] expected version [0x%x]",
168	__func__, msg_version, PCEP_MESSAGE_HEADER_VERSION);
169	return false;
170	}
171
172	if (msg_flags != 0) {
173	pcep_log(LOG_INFO,
174	"%s: Invalid PCEP message header flags [0x%x]",
175	__func__, msg_flags);
176	return false;
177	}
178
179	switch (msg_type) {
180	/* Supported message types */
181	case PCEP_TYPE_OPEN:
182	case PCEP_TYPE_KEEPALIVE:
183	case PCEP_TYPE_PCREQ:
184	case PCEP_TYPE_PCREP:
185	case PCEP_TYPE_PCNOTF:
186	case PCEP_TYPE_ERROR:
187	case PCEP_TYPE_CLOSE:
188	case PCEP_TYPE_REPORT:
189	case PCEP_TYPE_UPDATE:
190	case PCEP_TYPE_INITIATE:
191	break;
192	default:
193	pcep_log(LOG_INFO, "%s: Invalid PCEP message header type [%d]",
194	__func__, msg_type);
195	return false;
196	break;
197	}
198
199	return true;
200	}
201
202	/* Internal util function */
203	static uint16_t pcep_decode_msg_header(const uint8_t *msg_buf,
204	uint8_t msg_version, uint8_t msg_flags,
205	uint8_t *msg_type)
206	{
207	// Check RFC 5440 for version and flags position.
208	// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
209	//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
210	//\| Ver \| Flags \| Message-Type \| Message-Length \|
211	//+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
212	*msg_version = (msg_buf[0] >> 5) & 0x07;
213	*msg_flags = (msg_buf[0] & 0x1f);
214	*msg_type = msg_buf[1];
215	uint16_t host_order_length;
216	memcpy(&host_order_length, msg_buf + 2, sizeof(host_order_length));
217	return ntohs(host_order_length);
218	}
219
220	/* Decode the message header and return the message length */
221	int32_t pcep_decode_validate_msg_header(const uint8_t *msg_buf)
222	{
223	uint8_t msg_version;
224	uint8_t msg_flags;
225	uint8_t msg_type;
226	uint32_t msg_length;
227
228	msg_length = pcep_decode_msg_header(msg_buf, &msg_version, &msg_flags,
229	&msg_type);
230
231	return ((validate_msg_header(msg_version, msg_flags, msg_type,
232	msg_length)
233	== false)
234	? -1
235	: (int32_t)msg_length);
236	}
237
238	bool validate_message_objects(struct pcep_message *msg)
239	{
240	if (msg->msg_header->type >= PCEP_TYPE_START_TLS) {
241	pcep_log(
242	LOG_INFO,
243	"%s: Rejecting received message: Unknown message type [%d]",
244	__func__, msg->msg_header->type);
245	return false;
246	}
247
248	const enum pcep_object_classes *object_classes =
249	MANDATORY_MESSAGE_OBJECT_CLASSES[msg->msg_header->type];
250	double_linked_list_node *node;
251	int index;
252	for (node = (msg->obj_list == NULL ? NULL : msg->obj_list->head),
253	index = 0;
254	index < NUM_CHECKED_OBJECTS;
255	index++, (node = (node == NULL ? NULL : node->next_node))) {
256	struct pcep_object_header *obj =
257	((node == NULL)
258	? NULL
259	: (struct pcep_object_header *)node->data);
260
261	if ((int)object_classes[index] == NO_OBJECT) {
262	if (node != NULL) {
263	pcep_log(
264	LOG_INFO,
265	"%s: Rejecting received message: Unexpected object [%d] present",
266	__func__, obj->object_class);
267	return false;
268	}
269	} else if (object_classes[index] != ANY_OBJECT) {
270	if (node == NULL) {
271	pcep_log(
272	LOG_INFO,
273	"%s: Rejecting received message: Expecting object in position [%d], but none received",
274	__func__, index);
275	return false;
276	} else if (object_classes[index] != obj->object_class) {
277	pcep_log(
278	LOG_INFO,
279	"%s: Rejecting received message: Unexpected Object Class received [%d]",
280	__func__, object_classes[index]);
281	return false;
282	}
283	}
284	}
285
286	return true;
287	}
288
289	struct pcep_message pcep_decode_message(const uint8_t msg_buf)
290	{
291	uint8_t msg_version;
292	uint8_t msg_flags;
293	uint8_t msg_type;
294	uint16_t msg_length;
295
296	msg_length = pcep_decode_msg_header(msg_buf, &msg_version, &msg_flags,
297	&msg_type);
298
299	struct pcep_message *msg =
300	pceplib_calloc(PCEPLIB_MESSAGES, sizeof(struct pcep_message));
301
302	msg->msg_header = pceplib_malloc(PCEPLIB_MESSAGES,
303	sizeof(struct pcep_message_header));
304	msg->msg_header->pcep_version = msg_version;
305	msg->msg_header->type = msg_type;
306
307	msg->obj_list = dll_initialize();
308	msg->encoded_message = pceplib_malloc(PCEPLIB_MESSAGES, msg_length);
309	memcpy(msg->encoded_message, msg_buf, msg_length);
310	msg->encoded_message_length = msg_length;
311
312	uint16_t bytes_read = MESSAGE_HEADER_LENGTH;
313	while ((msg_length - bytes_read) >= OBJECT_HEADER_LENGTH) {
314	struct pcep_object_header *obj_hdr =
315	pcep_decode_object(msg_buf + bytes_read);
316
317	if (obj_hdr == NULL) {
318	pcep_log(LOG_INFO, "%s: Discarding invalid message",
319	__func__);
320	pcep_msg_free_message(msg);
321
322	return NULL;
323	}
324
325	dll_append(msg->obj_list, obj_hdr);
326	bytes_read += obj_hdr->encoded_object_length;
327	}
328
329	if (validate_message_objects(msg) == false) {
330	pcep_log(LOG_INFO, "%s: Discarding invalid message", __func__);
331	pcep_msg_free_message(msg);
332
333	return NULL;
334	}
335
336	return msg;
337	}
338
339	struct pcep_versioning *create_default_pcep_versioning()
340	{
341	struct pcep_versioning *versioning =
342	pceplib_malloc(PCEPLIB_INFRA, sizeof(struct pcep_versioning));
343	memset(versioning, 0, sizeof(struct pcep_versioning));
344
345	return versioning;
346	}
347
348	void destroy_pcep_versioning(struct pcep_versioning *versioning)
349	{
350	pceplib_free(PCEPLIB_INFRA, versioning);
351	}