forked from acouzens/open5gs
208 lines
8.2 KiB
C
208 lines
8.2 KiB
C
/*********************************************************************************************************
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* Software License Agreement (BSD License) *
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* Author: Sebastien Decugis <sdecugis@freediameter.net> *
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* *
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* Copyright (c) 2013, WIDE Project and NICT *
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* All rights reserved. *
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* *
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* Redistribution and use of this software in source and binary forms, with or without modification, are *
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* permitted provided that the following conditions are met: *
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* *
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* * Redistributions of source code must retain the above *
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* copyright notice, this list of conditions and the *
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* following disclaimer. *
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* *
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* * Redistributions in binary form must reproduce the above *
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* copyright notice, this list of conditions and the *
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* following disclaimer in the documentation and/or other *
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* materials provided with the distribution. *
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* *
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* * Neither the name of the WIDE Project or NICT nor the *
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* names of its contributors may be used to endorse or *
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* promote products derived from this software without *
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* specific prior written permission of WIDE Project and *
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* NICT. *
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* *
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED *
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A *
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR *
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT *
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS *
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR *
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* TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF *
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* ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. *
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*********************************************************************************************************/
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#include "fdcore-internal.h"
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/* This file contains code to handle Disconnect Peer messages (DPR and DPA) */
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/* Delay to use before next reconnect attempt */
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int fd_p_dp_newdelay(struct fd_peer * peer)
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{
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int delay = peer->p_hdr.info.config.pic_tctimer ?: fd_g_config->cnf_timer_tc;
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switch (peer->p_hdr.info.runtime.pir_lastDC) {
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case ACV_DC_REBOOTING:
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default:
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/* We use TcTimer to attempt reconnection */
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break;
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case ACV_DC_BUSY:
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/* No need to hammer the overloaded peer */
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delay *= 10;
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break;
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case ACV_DC_NOT_FRIEND:
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/* He does not want to speak to us... let's retry a *lot* later maybe */
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delay *= 200;
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break;
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}
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return delay;
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}
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/* Handle a received message */
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int fd_p_dp_handle(struct msg ** msg, int req, struct fd_peer * peer)
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{
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long to_receive, to_send;
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TRACE_ENTRY("%p %d %p", msg, req, peer);
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if (req) {
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/* We received a DPR, save the Disconnect-Cause and go to CLOSING_GRACE or terminate the connection */
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struct avp * dc;
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CHECK_FCT( fd_msg_search_avp ( *msg, fd_dict_avp_DC, &dc ));
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if (dc) {
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struct avp_hdr * hdr;
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CHECK_FCT( fd_msg_avp_hdr( dc, &hdr ) );
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if (hdr->avp_value == NULL) {
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/* This is a sanity check */
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LOG_F("BUG: Unset value in Disconnect-Cause in DPR");
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ASSERT(0); /* To check if this really happens, and understand why... */
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}
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/* save the cause */
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peer->p_hdr.info.runtime.pir_lastDC = hdr->avp_value->u32;
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}
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if (TRACE_BOOL(INFO)) {
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if (dc) {
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struct dict_object * dictobj;
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struct dict_enumval_request er;
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memset(&er, 0, sizeof(er));
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/* prepare the request */
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CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_TYPE, TYPE_OF_AVP, fd_dict_avp_DC, &er.type_obj, ENOENT ) );
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er.search.enum_value.u32 = peer->p_hdr.info.runtime.pir_lastDC;
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/* Search the enum value */
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CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_ENUMVAL, ENUMVAL_BY_STRUCT, &er, &dictobj, 0 ) );
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if (dictobj) {
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CHECK_FCT( fd_dict_getval( dictobj, &er.search ) );
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TRACE_DEBUG(INFO, "Peer '%s' sent a DPR with cause: %s", peer->p_hdr.info.pi_diamid, er.search.enum_name);
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} else {
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TRACE_DEBUG(INFO, "Peer '%s' sent a DPR with unknown cause: %u", peer->p_hdr.info.pi_diamid, peer->p_hdr.info.runtime.pir_lastDC);
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}
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} else {
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TRACE_DEBUG(INFO, "Peer '%s' sent a DPR without Disconnect-Cause AVP", peer->p_hdr.info.pi_diamid);
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}
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}
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/* Now reply with a DPA */
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CHECK_FCT( fd_msg_new_answer_from_req ( fd_g_config->cnf_dict, msg, 0 ) );
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CHECK_FCT( fd_msg_rescode_set( *msg, "DIAMETER_SUCCESS", NULL, NULL, 1 ) );
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/* Do we have pending exchanges with this peer? */
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CHECK_FCT( fd_peer_get_load_pending(&peer->p_hdr, &to_receive, &to_send) );
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if ((to_receive == 0) && (to_send == 0)) {
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/* No pending exchange, move to CLOSING directly */
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CHECK_FCT( fd_psm_change_state(peer, STATE_CLOSING) );
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/* Now send the DPA */
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CHECK_FCT( fd_out_send( msg, NULL, peer, 0) );
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/* and move to CLOSED */
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fd_psm_cleanup(peer, 0);
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/* Reset the timer for next connection attempt -- we'll retry sooner or later depending on the disconnection cause */
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fd_psm_next_timeout(peer, 1, fd_p_dp_newdelay(peer));
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} else {
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/* We have pending exchanges, we move to CLOSING_GRACE which allows exchanges of answers but
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not new requests */
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CHECK_FCT( fd_psm_change_state(peer, STATE_CLOSING_GRACE) );
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fd_psm_next_timeout(peer, 0, GRACE_TIMEOUT);
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/* Now send the DPA */
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CHECK_FCT( fd_out_send( msg, NULL, peer, 0) );
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}
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} else {
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/* We received a DPA */
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int curstate = fd_peer_getstate(peer);
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if (curstate != STATE_CLOSING_GRACE) {
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TRACE_DEBUG(INFO, "Ignoring DPA received in state %s", STATE_STR(curstate));
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}
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/* In theory, we should control the Result-Code AVP. But since we will not go back to OPEN state here anyway, let's skip it */
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/* TODO("Control Result-Code in the DPA") */
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CHECK_FCT_DO( fd_msg_free( *msg ), /* continue */ );
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*msg = NULL;
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/* Do we still have pending exchanges with this peer? */
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CHECK_FCT( fd_peer_get_load_pending(&peer->p_hdr, &to_receive, &to_send) );
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if ((to_receive != 0) || (to_send != 0)) {
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TRACE_DEBUG(INFO, "Received DPA but pending load: [%ld, %ld], giving grace delay before closing", to_receive, to_send);
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fd_psm_next_timeout(peer, 0, GRACE_TIMEOUT);
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peer->p_flags.pf_localterm = 1;
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} else {
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/* otherwise, go to CLOSING state, the psm will handle terminating the connection */
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CHECK_FCT( fd_psm_change_state(peer, STATE_CLOSING) );
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}
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}
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return 0;
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}
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/* Start disconnection of a peer: send DPR */
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int fd_p_dp_initiate(struct fd_peer * peer, char * reason)
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{
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struct msg * msg = NULL;
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struct dict_object * dictobj = NULL;
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struct avp * avp = NULL;
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struct dict_enumval_request er;
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union avp_value val;
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TRACE_ENTRY("%p %p", peer, reason);
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/* Create a new DWR instance */
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CHECK_FCT( fd_msg_new ( fd_dict_cmd_DPR, MSGFL_ALLOC_ETEID, &msg ) );
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/* Add the Origin information */
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CHECK_FCT( fd_msg_add_origin ( msg, 0 ) );
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/* Add the Disconnect-Cause */
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CHECK_FCT( fd_msg_avp_new ( fd_dict_avp_DC, 0, &avp ) );
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/* Search the value in the dictionary */
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memset(&er, 0, sizeof(er));
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CHECK_FCT( fd_dict_search( fd_g_config->cnf_dict, DICT_TYPE, TYPE_OF_AVP, fd_dict_avp_DC, &er.type_obj, ENOENT ) );
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er.search.enum_name = reason ?: "REBOOTING";
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CHECK_FCT_DO( fd_dict_search( fd_g_config->cnf_dict, DICT_ENUMVAL, ENUMVAL_BY_STRUCT, &er, &dictobj, ENOENT ), { ASSERT(0); /* internal error: unknown reason */ } );
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CHECK_FCT( fd_dict_getval( dictobj, &er.search ) );
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/* Set the value in the AVP */
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val.u32 = er.search.enum_value.u32;
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CHECK_FCT( fd_msg_avp_setvalue( avp, &val ) );
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CHECK_FCT( fd_msg_avp_add( msg, MSG_BRW_LAST_CHILD, avp ) );
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/* Save the value also in the peer */
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peer->p_hdr.info.runtime.pir_lastDC = val.u32;
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/* Update the peer state and timer */
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CHECK_FCT( fd_psm_change_state(peer, STATE_CLOSING_GRACE) );
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fd_psm_next_timeout(peer, 0, DPR_TIMEOUT);
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/* Now send the DPR message */
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CHECK_FCT_DO( fd_out_send(&msg, NULL, peer, 0), /* ignore since we are on timeout anyway */ );
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return 0;
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}
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