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pcep_session_logic_states.c
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/*
* 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>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <pthread.h>
#include <stdbool.h>
#include <stdio.h>
#include <string.h>
#include <assert.h>
#include "pcep_msg_encoding.h"
#include "pcep_session_logic.h"
#include "pcep_session_logic_internals.h"
#include "pcep_timers.h"
#include "pcep_utils_logging.h"
#include "pcep_utils_memory.h"
#define TIMER_OPEN_KEEP_ALIVE_SECONDS 1
/* Session Logic Handle managed in pcep_session_logic.c */
extern pcep_event_queue *session_logic_event_queue_;
void send_keep_alive(pcep_session *session);
void send_pcep_error_with_object(pcep_session *session,
enum pcep_error_type error_type,
enum pcep_error_value error_value,
struct pcep_object_header *object);
void reset_dead_timer(pcep_session *session);
bool verify_pcep_open_object(pcep_session *session,
struct pcep_object_open *open_object);
void send_reconciled_pcep_open(pcep_session *session,
struct pcep_message *error_msg);
bool handle_pcep_update(pcep_session *session, struct pcep_message *upd_msg);
bool handle_pcep_initiate(pcep_session *session, struct pcep_message *init_msg);
bool check_and_send_open_keep_alive(pcep_session *session);
void log_pcc_pce_connection(pcep_session *session);
bool handle_pcep_open(pcep_session *session, struct pcep_message *open_msg);
/*
* util functions called by the state handling below
*/
void send_keep_alive(pcep_session *session)
{
struct pcep_message *keep_alive_msg = pcep_msg_create_keepalive();
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] pcep_session_logic send keep_alive message for session [%d]",
__func__, time(NULL), pthread_self(), session->session_id);
session_send_message(session, keep_alive_msg);
/* The keep alive timer will be (re)set once the message
* is sent in session_logic_message_sent_handler() */
}
/* Send an error message with the corrected or offending object */
void send_pcep_error_with_object(pcep_session *session,
enum pcep_error_type error_type,
enum pcep_error_value error_value,
struct pcep_object_header *object)
{
double_linked_list *obj_list = dll_initialize();
dll_append(obj_list, object);
struct pcep_message *error_msg = pcep_msg_create_error_with_objects(
error_type, error_value, obj_list);
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] pcep_session_logic send error message with object [%d][%d] for session [%d]",
__func__, time(NULL), pthread_self(), error_type, error_value,
session->session_id);
session_send_message(session, error_msg);
}
void send_pcep_error(pcep_session *session, enum pcep_error_type error_type,
enum pcep_error_value error_value)
{
struct pcep_message *error_msg =
pcep_msg_create_error(error_type, error_value);
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] pcep_session_logic send error message [%d][%d] for session [%d]",
__func__, time(NULL), pthread_self(), error_type, error_value,
session->session_id);
session_send_message(session, error_msg);
}
void reset_dead_timer(pcep_session *session)
{
/* Default to configured dead_timer if its not set yet or set to 0 by
* the PCE */
int dead_timer_seconds =
(session->pcc_config.dead_timer_pce_negotiated_seconds == 0)
? session->pcc_config.dead_timer_seconds
: session->pcc_config.dead_timer_pce_negotiated_seconds;
if (session->timer_id_dead_timer == TIMER_ID_NOT_SET) {
session->timer_id_dead_timer =
create_timer(dead_timer_seconds, session);
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] pcep_session_logic set dead timer [%d secs] id [%d] for session [%d]",
__func__, time(NULL), pthread_self(),
dead_timer_seconds, session->timer_id_dead_timer,
session->session_id);
} else {
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] pcep_session_logic reset dead timer [%d secs] id [%d] for session [%d]",
__func__, time(NULL), pthread_self(),
dead_timer_seconds, session->timer_id_dead_timer,
session->session_id);
reset_timer(session->timer_id_dead_timer);
}
}
void enqueue_event(pcep_session *session, pcep_event_type event_type,
struct pcep_message *message)
{
if (event_type == MESSAGE_RECEIVED && message == NULL) {
pcep_log(
LOG_WARNING,
"%s: enqueue_event cannot enqueue a NULL message session [%d]",
__func__, session->session_id);
return;
}
pcep_event *event = pceplib_malloc(PCEPLIB_INFRA, sizeof(pcep_event));
memset(event, 0, sizeof(pcep_event));
event->session = session;
event->event_type = event_type;
event->event_time = time(NULL);
event->message = message;
pthread_mutex_lock(&session_logic_event_queue_->event_queue_mutex);
if (session_logic_event_queue_->event_callback != NULL) {
session_logic_event_queue_->event_callback(
session_logic_event_queue_->event_callback_data, event);
} else {
queue_enqueue(session_logic_event_queue_->event_queue, event);
}
pthread_mutex_unlock(&session_logic_event_queue_->event_queue_mutex);
}
/* Verify the received PCEP Open object parameters are acceptable. If not,
* update the unacceptable value(s) with an acceptable value so it can be sent
* back to the sender. */
bool verify_pcep_open_object(pcep_session *session,
struct pcep_object_open *open_object)
{
int retval = true;
if (open_object->open_keepalive
< session->pcc_config.min_keep_alive_seconds) {
pcep_log(
LOG_INFO,
"%s: Rejecting unsupported Open Keep Alive value [%d] min [%d]",
__func__, open_object->open_keepalive,
session->pcc_config.min_keep_alive_seconds);
open_object->open_keepalive =
session->pcc_config.min_keep_alive_seconds;
retval = false;
} else if (open_object->open_keepalive
> session->pcc_config.max_keep_alive_seconds) {
pcep_log(
LOG_INFO,
"%s: Rejecting unsupported Open Keep Alive value [%d] max [%d]",
__func__, open_object->open_keepalive,
session->pcc_config.max_keep_alive_seconds);
open_object->open_keepalive =
session->pcc_config.max_keep_alive_seconds;
retval = false;
}
if (open_object->open_deadtimer
< session->pcc_config.min_dead_timer_seconds) {
pcep_log(LOG_INFO,
"%s: Rejecting unsupported Open Dead Timer value [%d]",
__func__, open_object->open_deadtimer);
open_object->open_deadtimer =
session->pcc_config.min_dead_timer_seconds;
retval = false;
} else if (open_object->open_deadtimer
> session->pcc_config.max_dead_timer_seconds) {
pcep_log(LOG_INFO,
"%s: Rejecting unsupported Open Dead Timer value [%d]",
__func__, open_object->open_deadtimer);
open_object->open_deadtimer =
session->pcc_config.max_dead_timer_seconds;
retval = false;
}
/* Check for Open Object TLVs */
if (pcep_object_has_tlvs((struct pcep_object_header *)open_object)
== false) {
/* There are no TLVs, all done */
return retval;
}
double_linked_list_node *tlv_node = open_object->header.tlv_list->head;
while (tlv_node != NULL) {
struct pcep_object_tlv_header *tlv = tlv_node->data;
tlv_node = tlv_node->next_node;
/* Supported Open Object TLVs */
switch (tlv->type) {
case PCEP_OBJ_TLV_TYPE_LSP_DB_VERSION:
case PCEP_OBJ_TLV_TYPE_PATH_SETUP_TYPE_CAPABILITY:
case PCEP_OBJ_TLV_TYPE_SPEAKER_ENTITY_ID:
case PCEP_OBJ_TLV_TYPE_STATEFUL_PCE_CAPABILITY:
case PCEP_OBJ_TLV_TYPE_SR_PCE_CAPABILITY:
break;
case PCEP_OBJ_TLV_TYPE_NO_PATH_VECTOR:
case PCEP_OBJ_TLV_TYPE_OBJECTIVE_FUNCTION_LIST:
case PCEP_OBJ_TLV_TYPE_VENDOR_INFO:
case PCEP_OBJ_TLV_TYPE_SYMBOLIC_PATH_NAME:
case PCEP_OBJ_TLV_TYPE_IPV4_LSP_IDENTIFIERS:
case PCEP_OBJ_TLV_TYPE_IPV6_LSP_IDENTIFIERS:
case PCEP_OBJ_TLV_TYPE_LSP_ERROR_CODE:
case PCEP_OBJ_TLV_TYPE_RSVP_ERROR_SPEC:
case PCEP_OBJ_TLV_TYPE_PATH_SETUP_TYPE:
case PCEP_OBJ_TLV_TYPE_SRPOLICY_POL_ID:
case PCEP_OBJ_TLV_TYPE_SRPOLICY_POL_NAME:
case PCEP_OBJ_TLV_TYPE_SRPOLICY_CPATH_ID:
case PCEP_OBJ_TLV_TYPE_SRPOLICY_CPATH_PREFERENCE:
case PCEP_OBJ_TLV_TYPE_UNKNOWN:
case PCEP_OBJ_TYPE_CISCO_BSID:
case PCEP_OBJ_TLV_TYPE_ARBITRARY:
/* TODO how to handle unrecognized TLV ?? */
pcep_log(
LOG_INFO,
"%s: Unhandled OPEN Object TLV type: %d, length %d",
__func__, tlv->type, tlv->encoded_tlv_length);
break;
}
/* Verify the STATEFUL-PCE-CAPABILITY TLV */
if (tlv->type == PCEP_OBJ_TLV_TYPE_STATEFUL_PCE_CAPABILITY) {
struct pcep_object_tlv_stateful_pce_capability
*pce_cap_tlv =
(struct
pcep_object_tlv_stateful_pce_capability
*)tlv;
/* If the U flag is set, then the PCE is
* capable of updating LSP parameters */
if (pce_cap_tlv->flag_u_lsp_update_capability) {
if (session->pce_config
.support_stateful_pce_lsp_update
== false) {
/* Turn off the U bit, as it is not
* supported */
pcep_log(
LOG_INFO,
"%s: Rejecting unsupported Open STATEFUL-PCE-CAPABILITY TLV U flag",
__func__);
pce_cap_tlv
->flag_u_lsp_update_capability =
false;
retval = false;
} else {
session->stateful_pce = true;
pcep_log(
LOG_INFO,
"%s: Setting PCEP session [%d] STATEFUL to support LSP updates",
__func__, session->session_id);
}
}
/* TODO the rest of the flags are not implemented yet */
else if (pce_cap_tlv->flag_s_include_db_version) {
pcep_log(
LOG_INFO,
"%s: Ignoring Open STATEFUL-PCE-CAPABILITY TLV S Include DB Version flag",
__func__);
} else if (
pce_cap_tlv
->flag_i_lsp_instantiation_capability) {
pcep_log(
LOG_INFO,
"%s: Ignoring Open STATEFUL-PCE-CAPABILITY TLV I LSP Instantiation Capability flag",
__func__);
} else if (pce_cap_tlv->flag_t_triggered_resync) {
pcep_log(
LOG_INFO,
"%s: Ignoring Open STATEFUL-PCE-CAPABILITY TLV T Triggered Resync flag",
__func__);
} else if (pce_cap_tlv->flag_d_delta_lsp_sync) {
pcep_log(
LOG_INFO,
"%s: Ignoring Open STATEFUL-PCE-CAPABILITY TLV D Delta LSP Sync flag",
__func__);
} else if (pce_cap_tlv->flag_f_triggered_initial_sync) {
pcep_log(
LOG_INFO,
"%s: Ignoring Open STATEFUL-PCE-CAPABILITY TLV F Triggered Initial Sync flag",
__func__);
}
} else if (tlv->type == PCEP_OBJ_TLV_TYPE_LSP_DB_VERSION) {
if (session->pce_config.support_include_db_version
== false) {
pcep_log(
LOG_INFO,
"%s: Rejecting unsupported Open LSP DB VERSION TLV",
__func__);
/* Remove this TLV from the list */
dll_delete_node(open_object->header.tlv_list,
tlv_node);
retval = false;
}
}
}
return retval;
}
bool handle_pcep_open(pcep_session *session, struct pcep_message *open_msg)
{
/* Open Message validation and errors according to:
* https://tools.ietf.org/html/rfc5440#section-7.15 */
if (session->session_state != SESSION_STATE_PCEP_CONNECTING
&& session->session_state != SESSION_STATE_INITIALIZED) {
pcep_log(
LOG_INFO,
"%s: Received unexpected OPEN, current session state [%d, replying with error]",
__func__, session->session_state);
send_pcep_error(session,
PCEP_ERRT_ATTEMPT_TO_ESTABLISH_2ND_PCEP_SESSION,
PCEP_ERRV_RECVD_INVALID_OPEN_MSG);
return false;
}
if (session->pce_open_received == true
&& session->pce_open_rejected == false) {
pcep_log(LOG_INFO,
"%s: Received duplicate OPEN, replying with error",
__func__);
send_pcep_error(session,
PCEP_ERRT_ATTEMPT_TO_ESTABLISH_2ND_PCEP_SESSION,
PCEP_ERRV_RECVD_INVALID_OPEN_MSG);
return false;
}
struct pcep_object_open *open_object =
(struct pcep_object_open *)pcep_obj_get(open_msg->obj_list,
PCEP_OBJ_CLASS_OPEN);
if (open_object == NULL) {
pcep_log(
LOG_INFO,
"%s: Received OPEN message with no OPEN object, replying with error",
__func__);
send_pcep_error(session, PCEP_ERRT_SESSION_FAILURE,
PCEP_ERRV_RECVD_INVALID_OPEN_MSG);
return false;
}
/* Check for additional Open Msg objects */
if (open_msg->obj_list->num_entries > 1) {
pcep_log(
LOG_INFO,
"%s: Found additional unsupported objects in the Open message, replying with error",
__func__);
send_pcep_error(session, PCEP_ERRT_SESSION_FAILURE,
PCEP_ERRV_RECVD_INVALID_OPEN_MSG);
return false;
}
session->pce_open_received = true;
/* Verify the open object parameters and TLVs */
if (verify_pcep_open_object(session, open_object) == false) {
enqueue_event(session, PCC_RCVD_INVALID_OPEN, NULL);
if (session->pce_open_rejected) {
/* The Open message was already rejected once, so
* according to the spec, send an error message and
* close the TCP connection. */
pcep_log(
LOG_INFO,
"%s: Received 2 consecutive unsupported Open messages, closing the connection.",
__func__);
send_pcep_error(
session, PCEP_ERRT_SESSION_FAILURE,
PCEP_ERRV_RECVD_SECOND_OPEN_MSG_UNACCEPTABLE);
socket_comm_session_close_tcp_after_write(
session->socket_comm_session);
session->session_state = SESSION_STATE_INITIALIZED;
enqueue_event(session, PCC_CONNECTION_FAILURE, NULL);
} else {
session->pce_open_rejected = true;
/* Clone the object here, since the encapsulating
* message will be deleted in handle_socket_comm_event()
* most likely before this error message is sent */
struct pcep_object_open *cloned_open_object =
pceplib_malloc(PCEPLIB_MESSAGES,
sizeof(struct pcep_object_open));
memcpy(cloned_open_object, open_object,
sizeof(struct pcep_object_open));
open_object->header.tlv_list = NULL;
cloned_open_object->header.encoded_object = NULL;
cloned_open_object->header.encoded_object_length = 0;
send_pcep_error_with_object(
session, PCEP_ERRT_SESSION_FAILURE,
PCEP_ERRV_UNACCEPTABLE_OPEN_MSG_NEG,
&cloned_open_object->header);
}
return false;
}
/*
* Open Message accepted
* Sending the keep-alive response will be managed the function caller
*/
session->timer_id_open_keep_alive =
create_timer(TIMER_OPEN_KEEP_ALIVE_SECONDS, session);
session->pcc_config.dead_timer_pce_negotiated_seconds =
(int)open_object->open_deadtimer;
/* Cancel the timer so we can change the dead_timer value */
cancel_timer(session->timer_id_dead_timer);
session->timer_id_dead_timer = TIMER_ID_NOT_SET;
reset_dead_timer(session);
return true;
}
/* The original PCEP Open message sent to the PCE was rejected,
* try to reconcile the differences and re-send a new Open. */
void send_reconciled_pcep_open(pcep_session *session,
struct pcep_message *error_msg)
{
struct pcep_message *open_msg = create_pcep_open(session);
struct pcep_object_open *error_open_obj =
(struct pcep_object_open *)pcep_obj_get(error_msg->obj_list,
PCEP_OBJ_CLASS_OPEN);
if (error_open_obj == NULL) {
/* Nothing to reconcile, send the same Open message again */
pcep_log(
LOG_INFO,
"%s: No Open object received in Error, sending the same Open message",
__func__);
session_send_message(session, open_msg);
return;
}
struct pcep_object_open *open_obj =
(struct pcep_object_open *)pcep_obj_get(open_msg->obj_list,
PCEP_OBJ_CLASS_OPEN);
// open_msg can not have empty obj_list
assert(open_obj != NULL);
if (error_open_obj->open_deadtimer
!= session->pce_config.dead_timer_seconds) {
if (error_open_obj->open_deadtimer
>= session->pce_config.min_dead_timer_seconds
&& error_open_obj->open_deadtimer
<= session->pce_config.max_dead_timer_seconds) {
open_obj->open_deadtimer =
error_open_obj->open_deadtimer;
session->pcc_config.dead_timer_pce_negotiated_seconds =
error_open_obj->open_deadtimer;
pcep_log(
LOG_INFO,
"%s: Open deadtimer value [%d] rejected, using PCE value [%d]",
__func__,
session->pcc_config.dead_timer_seconds,
session->pcc_config
.dead_timer_pce_negotiated_seconds);
/* Reset the timer with the new value */
cancel_timer(session->timer_id_dead_timer);
session->timer_id_dead_timer = TIMER_ID_NOT_SET;
reset_dead_timer(session);
} else {
pcep_log(
LOG_INFO,
"%s: Can not reconcile Open with suggested deadtimer [%d]",
__func__, error_open_obj->open_deadtimer);
}
}
if (error_open_obj->open_keepalive
!= session->pce_config.keep_alive_seconds) {
if (error_open_obj->open_keepalive
>= session->pce_config.min_keep_alive_seconds
&& error_open_obj->open_keepalive
<= session->pce_config.max_keep_alive_seconds) {
open_obj->open_keepalive =
error_open_obj->open_keepalive;
session->pcc_config
.keep_alive_pce_negotiated_timer_seconds =
error_open_obj->open_keepalive;
pcep_log(
LOG_INFO,
"%s: Open keep alive value [%d] rejected, using PCE value [%d]",
__func__,
session->pcc_config.keep_alive_seconds,
session->pcc_config
.keep_alive_pce_negotiated_timer_seconds);
/* Cancel the timer, the timer will be set again with
* the new value when this open message is sent */
cancel_timer(session->timer_id_keep_alive);
session->timer_id_keep_alive = TIMER_ID_NOT_SET;
} else {
pcep_log(
LOG_INFO,
"%s: Can not reconcile Open with suggested keepalive [%d]",
__func__, error_open_obj->open_keepalive);
}
}
/* TODO reconcile the TLVs */
session_send_message(session, open_msg);
reset_timer(session->timer_id_open_keep_alive);
}
bool handle_pcep_update(pcep_session *session, struct pcep_message *upd_msg)
{
/* Update Message validation and errors according to:
* https://tools.ietf.org/html/rfc8231#section-6.2 */
if (upd_msg->obj_list == NULL) {
pcep_log(LOG_INFO,
"%s: Invalid PcUpd message: Message has no objects",
__func__);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_SRP_OBJECT_MISSING);
return false;
}
/* Verify the mandatory objects are present */
struct pcep_object_header *obj =
pcep_obj_get(upd_msg->obj_list, PCEP_OBJ_CLASS_SRP);
if (obj == NULL) {
pcep_log(LOG_INFO,
"%s: Invalid PcUpd message: Missing SRP object",
__func__);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_SRP_OBJECT_MISSING);
return false;
}
obj = pcep_obj_get(upd_msg->obj_list, PCEP_OBJ_CLASS_LSP);
if (obj == NULL) {
pcep_log(LOG_INFO,
"%s: Invalid PcUpd message: Missing LSP object",
__func__);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_LSP_OBJECT_MISSING);
return false;
}
obj = pcep_obj_get(upd_msg->obj_list, PCEP_OBJ_CLASS_ERO);
if (obj == NULL) {
pcep_log(LOG_INFO,
"%s: Invalid PcUpd message: Missing ERO object",
__func__);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_ERO_OBJECT_MISSING);
return false;
}
/* Verify the objects are are in the correct order */
double_linked_list_node *node = upd_msg->obj_list->head;
struct pcep_object_srp *srp_object =
(struct pcep_object_srp *)node->data;
if (srp_object->header.object_class != PCEP_OBJ_CLASS_SRP) {
pcep_log(
LOG_INFO,
"%s: Invalid PcUpd message: First object must be an SRP, found [%d]",
__func__, srp_object->header.object_class);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_SRP_OBJECT_MISSING);
return false;
}
node = node->next_node;
struct pcep_object_lsp *lsp_object =
(struct pcep_object_lsp *)node->data;
if (lsp_object->header.object_class != PCEP_OBJ_CLASS_LSP) {
pcep_log(
LOG_INFO,
"%s: Invalid PcUpd message: Second object must be an LSP, found [%d]",
__func__, lsp_object->header.object_class);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_LSP_OBJECT_MISSING);
return false;
}
node = node->next_node;
struct pcep_object_ro *ero_object = node->data;
if (ero_object->header.object_class != PCEP_OBJ_CLASS_ERO) {
pcep_log(
LOG_INFO,
"%s: Invalid PcUpd message: Third object must be an ERO, found [%d]",
__func__, ero_object->header.object_class);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_ERO_OBJECT_MISSING);
return false;
}
return true;
}
bool handle_pcep_initiate(pcep_session *session, struct pcep_message *init_msg)
{
/* Instantiate Message validation and errors according to:
* https://tools.ietf.org/html/rfc8281#section-5 */
if (init_msg->obj_list == NULL) {
pcep_log(
LOG_INFO,
"%s: Invalid PcInitiate message: Message has no objects",
__func__);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_SRP_OBJECT_MISSING);
return false;
}
/* Verify the mandatory objects are present */
struct pcep_object_header *obj =
pcep_obj_get(init_msg->obj_list, PCEP_OBJ_CLASS_SRP);
if (obj == NULL) {
pcep_log(LOG_INFO,
"%s: Invalid PcInitiate message: Missing SRP object",
__func__);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_SRP_OBJECT_MISSING);
return false;
}
obj = pcep_obj_get(init_msg->obj_list, PCEP_OBJ_CLASS_LSP);
if (obj == NULL) {
pcep_log(LOG_INFO,
"%s: Invalid PcInitiate message: Missing LSP object",
__func__);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_LSP_OBJECT_MISSING);
return false;
}
/* Verify the objects are are in the correct order */
double_linked_list_node *node = init_msg->obj_list->head;
struct pcep_object_srp *srp_object =
(struct pcep_object_srp *)node->data;
if (srp_object->header.object_class != PCEP_OBJ_CLASS_SRP) {
pcep_log(
LOG_INFO,
"%s: Invalid PcInitiate message: First object must be an SRP, found [%d]",
__func__, srp_object->header.object_class);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_SRP_OBJECT_MISSING);
return false;
}
node = node->next_node;
struct pcep_object_lsp *lsp_object =
(struct pcep_object_lsp *)node->data;
if (lsp_object->header.object_class != PCEP_OBJ_CLASS_LSP) {
pcep_log(
LOG_INFO,
"%s: Invalid PcInitiate message: Second object must be an LSP, found [%d]",
__func__, lsp_object->header.object_class);
send_pcep_error(session, PCEP_ERRT_MANDATORY_OBJECT_MISSING,
PCEP_ERRV_LSP_OBJECT_MISSING);
return false;
}
/* There may be more optional objects */
return true;
}
void increment_unknown_message(pcep_session *session)
{
/* https://tools.ietf.org/html/rfc5440#section-6.9
* If a PCC/PCE receives unrecognized messages at a rate equal or
* greater than MAX-UNKNOWN-MESSAGES unknown message requests per
* minute, the PCC/PCE MUST send a PCEP CLOSE message */
time_t *unknown_message_time =
pceplib_malloc(PCEPLIB_INFRA, sizeof(time_t));
*unknown_message_time = time(NULL);
time_t expire_time = *unknown_message_time + 60;
queue_enqueue(session->num_unknown_messages_time_queue,
unknown_message_time);
/* Purge any entries older than 1 minute. The oldest entries are at the
* queue head */
queue_node *time_node = session->num_unknown_messages_time_queue->head;
while (time_node != NULL) {
if (*((time_t *)time_node->data) > expire_time) {
pceplib_free(
PCEPLIB_INFRA,
queue_dequeue(
session->num_unknown_messages_time_queue));
time_node =
session->num_unknown_messages_time_queue->head;
} else {
time_node = NULL;
}
}
if ((int)session->num_unknown_messages_time_queue->num_entries
>= session->pcc_config.max_unknown_messages) {
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] Max unknown messages reached [%d] closing session [%d]",
__func__, time(NULL), pthread_self(),
session->pcc_config.max_unknown_messages,
session->session_id);
close_pcep_session_with_reason(session,
PCEP_CLOSE_REASON_UNREC_MSG);
enqueue_event(session, PCC_RCVD_MAX_UNKOWN_MSGS, NULL);
}
}
bool check_and_send_open_keep_alive(pcep_session *session)
{
if (session->pce_open_received == true
&& session->pce_open_rejected == false
&& session->pce_open_keep_alive_sent == false) {
/* Send the PCE Open keep-alive response if it hasnt been sent
* yet */
cancel_timer(session->timer_id_open_keep_alive);
session->timer_id_open_keep_alive = TIMER_ID_NOT_SET;
send_keep_alive(session);
session->pce_open_keep_alive_sent = true;
return true;
}
return false;
}
void log_pcc_pce_connection(pcep_session *session)
{
if (session->socket_comm_session == NULL) {
/* This only happens in UT */
return;
}
char src_ip_buf[40] = {0}, dst_ip_buf[40] = {0};
uint16_t src_port, dst_port;
if (session->socket_comm_session->is_ipv6) {
inet_ntop(AF_INET6,
&session->socket_comm_session->src_sock_addr
.src_sock_addr_ipv6.sin6_addr,
src_ip_buf, sizeof(src_ip_buf));
inet_ntop(AF_INET6,
&session->socket_comm_session->dest_sock_addr
.dest_sock_addr_ipv6.sin6_addr,
dst_ip_buf, sizeof(dst_ip_buf));
src_port = htons(session->socket_comm_session->src_sock_addr
.src_sock_addr_ipv6.sin6_port);
dst_port = htons(session->socket_comm_session->dest_sock_addr
.dest_sock_addr_ipv6.sin6_port);
} else {
inet_ntop(AF_INET,
&session->socket_comm_session->src_sock_addr
.src_sock_addr_ipv4.sin_addr,
src_ip_buf, sizeof(src_ip_buf));
inet_ntop(AF_INET,
&session->socket_comm_session->dest_sock_addr
.dest_sock_addr_ipv4.sin_addr,
dst_ip_buf, sizeof(dst_ip_buf));
src_port = htons(session->socket_comm_session->src_sock_addr
.src_sock_addr_ipv4.sin_port);
dst_port = htons(session->socket_comm_session->dest_sock_addr
.dest_sock_addr_ipv4.sin_port);
}
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] Successful PCC [%s:%d] connection to PCE [%s:%d] session [%d] fd [%d]",
__func__, time(NULL), pthread_self(), src_ip_buf, src_port,
dst_ip_buf, dst_port, session->session_id,
session->socket_comm_session->socket_fd);
}
/*
* these functions are called by session_logic_loop() from
* pcep_session_logic_loop.c these functions are executed in the
* session_logic_loop thread, and the mutex is locked before calling these
* functions, so they are thread safe.
*/
/* state machine handling for expired timers */
void handle_timer_event(pcep_session_event *event)
{
if (event == NULL) {
pcep_log(LOG_INFO, "%s: handle_timer_event NULL event",
__func__);
return;
}
pcep_session *session = event->session;
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] pcep_session_logic handle_timer_event: session [%d] event timer_id [%d] session timers [OKW, OKA, DT, KA] [%d, %d, %d, %d]",
__func__, time(NULL), pthread_self(), session->session_id,
event->expired_timer_id, session->timer_id_open_keep_wait,
session->timer_id_open_keep_alive, session->timer_id_dead_timer,
session->timer_id_keep_alive);
/*
* these timer expirations are independent of the session state
*/
if (event->expired_timer_id == session->timer_id_dead_timer) {
session->timer_id_dead_timer = TIMER_ID_NOT_SET;
increment_event_counters(session,
PCEP_EVENT_COUNTER_ID_TIMER_DEADTIMER);
close_pcep_session_with_reason(session,
PCEP_CLOSE_REASON_DEADTIMER);
enqueue_event(session, PCE_DEAD_TIMER_EXPIRED, NULL);
return;
} else if (event->expired_timer_id == session->timer_id_keep_alive) {
session->timer_id_keep_alive = TIMER_ID_NOT_SET;
increment_event_counters(session,
PCEP_EVENT_COUNTER_ID_TIMER_KEEPALIVE);
send_keep_alive(session);
return;
}
/*
* handle timers that depend on the session state
*/
switch (session->session_state) {
case SESSION_STATE_PCEP_CONNECTING:
if (event->expired_timer_id
== session->timer_id_open_keep_wait) {
/* close the TCP session */
pcep_log(
LOG_INFO,
"%s: handle_timer_event open_keep_wait timer expired for session [%d]",
__func__, session->session_id);
increment_event_counters(
session,
PCEP_EVENT_COUNTER_ID_TIMER_OPENKEEPWAIT);
socket_comm_session_close_tcp_after_write(
session->socket_comm_session);
session->session_state = SESSION_STATE_INITIALIZED;
session->timer_id_open_keep_wait = TIMER_ID_NOT_SET;
enqueue_event(session, PCE_OPEN_KEEP_WAIT_TIMER_EXPIRED,
NULL);
}
if (event->expired_timer_id
== session->timer_id_open_keep_alive) {
increment_event_counters(
session,
PCEP_EVENT_COUNTER_ID_TIMER_OPENKEEPALIVE);
session->timer_id_open_keep_alive = TIMER_ID_NOT_SET;
if (check_and_send_open_keep_alive(session) == true) {
if (session->pcc_open_accepted == true
&& session->session_state
!= SESSION_STATE_PCEP_CONNECTED) {
log_pcc_pce_connection(session);
session->session_state =
SESSION_STATE_PCEP_CONNECTED;
increment_event_counters(
session,
PCEP_EVENT_COUNTER_ID_PCE_CONNECT);
enqueue_event(session,
PCC_CONNECTED_TO_PCE,
NULL);
}
}
return;
}
break;
case SESSION_STATE_INITIALIZED:
case SESSION_STATE_PCEP_CONNECTED:
case SESSION_STATE_UNKNOWN:
pcep_log(
LOG_INFO,
"%s: handle_timer_event unrecognized state transition, timer_id [%d] state [%d] session [%d]",
__func__, event->expired_timer_id,
session->session_state, session->session_id);
break;
}
}
/* State machine handling for received messages.
* This event was created in session_logic_msg_ready_handler() in
* pcep_session_logic_loop.c */
void handle_socket_comm_event(pcep_session_event *event)
{
if (event == NULL) {
pcep_log(LOG_INFO, "%s: handle_socket_comm_event NULL event",
__func__);
return;
}
pcep_session *session = event->session;
pcep_log(
LOG_INFO,
"%s: [%ld-%ld] pcep_session_logic handle_socket_comm_event: session [%d] num messages [%d] socket_closed [%d]",
__func__, time(NULL), pthread_self(), session->session_id,
(event->received_msg_list == NULL
? -1
: (int)event->received_msg_list->num_entries),
event->socket_closed);
/*
* independent of the session state
*/
if (event->socket_closed) {
pcep_log(
LOG_INFO,
"%s: handle_socket_comm_event socket closed for session [%d]",
__func__, session->session_id);
socket_comm_session_close_tcp(session->socket_comm_session);
enqueue_event(session, PCE_CLOSED_SOCKET, NULL);
if (session->session_state == SESSION_STATE_PCEP_CONNECTING) {
enqueue_event(session, PCC_CONNECTION_FAILURE, NULL);
}
session->session_state = SESSION_STATE_INITIALIZED;
increment_event_counters(session,
PCEP_EVENT_COUNTER_ID_PCE_DISCONNECT);
return;
}
reset_dead_timer(session);
if (event->received_msg_list == NULL) {
return;
}
/* Message received on socket */
double_linked_list_node *msg_node;
for (msg_node = event->received_msg_list->head; msg_node != NULL;
msg_node = msg_node->next_node) {
bool message_enqueued = false;
struct pcep_message *msg =
(struct pcep_message *)msg_node->data;
pcep_log(LOG_INFO, "%s: \t %s message", __func__,
get_message_type_str(msg->msg_header->type));
increment_message_rx_counters(session, msg);
switch (msg->msg_header->type) {
case PCEP_TYPE_OPEN:
/* handle_pcep_open() checks session state, and for
* duplicate erroneous open messages, and replies with
* error messages as needed. It also sets
* pce_open_received. */
if (handle_pcep_open(session, msg) == true) {
/* PCE Open Message Accepted */
enqueue_event(session, MESSAGE_RECEIVED, msg);
message_enqueued = true;
session->pce_open_accepted = true;
session->pce_open_rejected = false;
if (session->pcc_open_accepted) {
/* If both the PCC and PCE Opens are
* accepted, then the session is
* connected */
check_and_send_open_keep_alive(session);
log_pcc_pce_connection(session);