linuxptp/tlv.c

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/**
* @file tlv.c
* @note Copyright (C) 2012 Richard Cochran <richardcochran@gmail.com>
*
* 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, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <arpa/inet.h>
#include <string.h>
#include "tlv.h"
uint8_t ieee8021_id[3] = { IEEE_802_1_COMMITTEE };
static void scaled_ns_n2h(ScaledNs *sns)
{
sns->nanoseconds_msb = ntohs(sns->nanoseconds_msb);
sns->nanoseconds_lsb = net2host64(sns->nanoseconds_msb);
sns->fractional_nanoseconds = ntohs(sns->fractional_nanoseconds);
}
static void scaled_ns_h2n(ScaledNs *sns)
{
sns->nanoseconds_msb = htons(sns->nanoseconds_msb);
sns->nanoseconds_lsb = host2net64(sns->nanoseconds_msb);
sns->fractional_nanoseconds = htons(sns->fractional_nanoseconds);
}
static void mgt_post_recv(struct management_tlv *m)
{
struct currentDS *cds;
switch (m->id) {
case CURRENT_DATA_SET:
cds = (struct currentDS *) m->data;
cds->stepsRemoved = ntohs(cds->stepsRemoved);
cds->offsetFromMaster = net2host64(cds->offsetFromMaster);
cds->meanPathDelay = net2host64(cds->meanPathDelay);
break;
}
}
static void mgt_pre_send(struct management_tlv *m)
{
struct currentDS *cds;
switch (m->id) {
case CURRENT_DATA_SET:
cds = (struct currentDS *) m->data;
cds->stepsRemoved = htons(cds->stepsRemoved);
cds->offsetFromMaster = host2net64(cds->offsetFromMaster);
cds->meanPathDelay = host2net64(cds->meanPathDelay);
break;
}
}
static void org_post_recv(struct organization_tlv *org)
{
struct follow_up_info_tlv *f;
if (0 == memcmp(org->id, ieee8021_id, sizeof(ieee8021_id))) {
if (org->subtype[0] || org->subtype[1]) {
return;
}
switch (org->subtype[2]) {
case 1:
f = (struct follow_up_info_tlv *) org;
f->cumulativeScaledRateOffset = ntohl(f->cumulativeScaledRateOffset);
f->gmTimeBaseIndicator = ntohs(f->gmTimeBaseIndicator);
scaled_ns_n2h(&f->lastGmPhaseChange);
f->scaledLastGmPhaseChange = ntohl(f->scaledLastGmPhaseChange);
break;
}
}
}
static void org_pre_send(struct organization_tlv *org)
{
struct follow_up_info_tlv *f;
if (0 == memcmp(org->id, ieee8021_id, sizeof(ieee8021_id))) {
if (org->subtype[0] || org->subtype[1]) {
return;
}
switch (org->subtype[2]) {
case 1:
f = (struct follow_up_info_tlv *) org;
f->cumulativeScaledRateOffset = htonl(f->cumulativeScaledRateOffset);
f->gmTimeBaseIndicator = htons(f->gmTimeBaseIndicator);
scaled_ns_h2n(&f->lastGmPhaseChange);
f->scaledLastGmPhaseChange = htonl(f->scaledLastGmPhaseChange);
break;
}
}
}
void tlv_post_recv(struct TLV *tlv)
{
struct management_tlv *mgt;
struct management_error_status *mes;
struct path_trace_tlv *ptt;
switch (tlv->type) {
case TLV_MANAGEMENT:
mgt = (struct management_tlv *) tlv;
mgt->id = ntohs(mgt->id);
mgt_post_recv(mgt);
break;
case TLV_MANAGEMENT_ERROR_STATUS:
mes = (struct management_error_status *) tlv;
mes->error = ntohs(mes->error);
mes->id = ntohs(mes->id);
break;
case TLV_ORGANIZATION_EXTENSION:
org_post_recv((struct organization_tlv *) tlv);
break;
case TLV_REQUEST_UNICAST_TRANSMISSION:
case TLV_GRANT_UNICAST_TRANSMISSION:
case TLV_CANCEL_UNICAST_TRANSMISSION:
case TLV_ACKNOWLEDGE_CANCEL_UNICAST_TRANSMISSION:
break;
case TLV_PATH_TRACE:
ptt = (struct path_trace_tlv *) tlv;
if (path_length(ptt) > PATH_TRACE_MAX) {
ptt->length = PATH_TRACE_MAX * sizeof(struct ClockIdentity);
}
break;
case TLV_ALTERNATE_TIME_OFFSET_INDICATOR:
case TLV_AUTHENTICATION:
case TLV_AUTHENTICATION_CHALLENGE:
case TLV_SECURITY_ASSOCIATION_UPDATE:
case TLV_CUM_FREQ_SCALE_FACTOR_OFFSET:
default:
break;
}
}
void tlv_pre_send(struct TLV *tlv)
{
struct management_tlv *mgt;
struct management_error_status *mes;
switch (tlv->type) {
case TLV_MANAGEMENT:
mgt = (struct management_tlv *) tlv;
mgt_pre_send(mgt);
mgt->id = htons(mgt->id);
break;
case TLV_MANAGEMENT_ERROR_STATUS:
mes = (struct management_error_status *) tlv;
mes->error = htons(mes->error);
mes->id = htons(mes->id);
break;
case TLV_ORGANIZATION_EXTENSION:
org_pre_send((struct organization_tlv *) tlv);
break;
case TLV_REQUEST_UNICAST_TRANSMISSION:
case TLV_GRANT_UNICAST_TRANSMISSION:
case TLV_CANCEL_UNICAST_TRANSMISSION:
case TLV_ACKNOWLEDGE_CANCEL_UNICAST_TRANSMISSION:
case TLV_PATH_TRACE:
case TLV_ALTERNATE_TIME_OFFSET_INDICATOR:
case TLV_AUTHENTICATION:
case TLV_AUTHENTICATION_CHALLENGE:
case TLV_SECURITY_ASSOCIATION_UPDATE:
case TLV_CUM_FREQ_SCALE_FACTOR_OFFSET:
default:
break;
}
}