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/************************************************************************
* RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
* Copyright (C) 2001-2003 Optical Access
* Author: Alex Rozin
*
* This file is part of RSTP library.
*
* RSTP 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; version 2.1
*
* RSTP 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 RSTP library; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
**********************************************************************/
/* STP priority vectors API : 17.4.2 */
#include "base.h"
#include "stp_bpdu.h"
#include "vector.h"
#include "stp_vectors.h"
int
STP_VECT_compare_bridge_id (BRIDGE_ID* b1, BRIDGE_ID* b2)
{
if (b1->prio < b2->prio)
return -1;
if (b1->prio > b2->prio)
return 1;
return memcmp (b1->addr, b2->addr, 6);
}
void
STP_VECT_copy (OUT PRIO_VECTOR_T* t, IN PRIO_VECTOR_T* f)
{
(void) memcpy (t, f, sizeof (PRIO_VECTOR_T));
}
void
STP_VECT_create (OUT PRIO_VECTOR_T* t,
IN BRIDGE_ID* root_br,
IN unsigned long root_path_cost,
IN BRIDGE_ID* design_bridge,
IN PORT_ID design_port,
IN PORT_ID bridge_port)
{
(void) memcpy (&t->root_bridge, root_br, sizeof (BRIDGE_ID));
t->root_path_cost = root_path_cost;
(void) memcpy (&t->design_bridge, design_bridge, sizeof (BRIDGE_ID));
t->design_port = design_port;
t->bridge_port = bridge_port;
}
int
STP_VECT_compare_vector (PRIO_VECTOR_T* v1, PRIO_VECTOR_T* v2)
{
int bridcmp;
bridcmp = STP_VECT_compare_bridge_id (&v1->root_bridge, &v2->root_bridge);
if (bridcmp < 0) return bridcmp;
if (! bridcmp) {
bridcmp = v1->root_path_cost - v2->root_path_cost;
if (bridcmp < 0) return bridcmp;
if (! bridcmp) {
bridcmp = STP_VECT_compare_bridge_id (&v1->design_bridge, &v2->design_bridge);
if (bridcmp < 0) return bridcmp;
if (! bridcmp) {
bridcmp = v1->design_port - v2->design_port;
if (bridcmp < 0) return bridcmp;
if (! bridcmp)
return v1->bridge_port - v2->bridge_port;
}
}
}
return bridcmp;
}
static unsigned short
stp_vect_get_short (IN unsigned char* f)
{
/* LINTED: alignment */
return ntohs (*(unsigned short *)f);
}
static void
stp_vect_set_short (IN unsigned short f, OUT unsigned char* t)
{
/* LINTED: alignment */
*(unsigned short *)t = htons (f);
}
static void
stp_vect_get_bridge_id (IN unsigned char* c_br, OUT BRIDGE_ID* bridge_id)
{
bridge_id->prio = stp_vect_get_short (c_br);
(void) memcpy (bridge_id->addr, c_br + 2, 6);
}
static void
stp_vect_set_bridge_id (IN BRIDGE_ID* bridge_id, OUT unsigned char* c_br)
{
stp_vect_set_short (bridge_id->prio, c_br);
(void) memcpy (c_br + 2, bridge_id->addr, 6);
}
void
STP_VECT_get_vector (IN BPDU_BODY_T* b, OUT PRIO_VECTOR_T* v)
{
stp_vect_get_bridge_id (b->root_id, &v->root_bridge);
/* LINTED: alignment */
v->root_path_cost = ntohl (*((long*) b->root_path_cost));
stp_vect_get_bridge_id (b->bridge_id, &v->design_bridge);
v->design_port = stp_vect_get_short (b->port_id);
}
void
STP_VECT_set_vector (IN PRIO_VECTOR_T* v, OUT BPDU_BODY_T* b)
{
unsigned long root_path_cost;
stp_vect_set_bridge_id (&v->root_bridge, b->root_id);
root_path_cost = htonl (v->root_path_cost);
(void) memcpy (b->root_path_cost, &root_path_cost, 4);
stp_vect_set_bridge_id (&v->design_bridge, b->bridge_id);
stp_vect_set_short (v->design_port, b->port_id);
}
#ifdef STP_DBG
/*ARGSUSED*/
void
STP_VECT_br_id_print (IN char *title, IN BRIDGE_ID* br_id, IN Bool cr)
{
stp_trace ("%s=%04lX-%02x%02x%02x%02x%02x%02x",
title,
(unsigned long) br_id->prio,
(unsigned char) br_id->addr[0],
(unsigned char) br_id->addr[1],
(unsigned char) br_id->addr[2],
(unsigned char) br_id->addr[3],
(unsigned char) br_id->addr[4],
(unsigned char) br_id->addr[5]);
#ifndef __SUN__
stp_trace (cr ? "\n" : " ");
#endif
}
void
STP_VECT_print (IN char *title, IN PRIO_VECTOR_T *v)
{
stp_trace ("%s:", title);
STP_VECT_br_id_print ("rootBr", &v->root_bridge, False);
/****
stp_trace (" rpc=%ld ", (long) v->root_path_cost);
****/
STP_VECT_br_id_print ("designBr", &v->design_bridge, False);
/****/
stp_trace (" dp=%lx bp=%lx ",
(unsigned long) v->design_port,
(unsigned long) v->bridge_port);
/***********/
stp_trace ("\n");
}
#endif
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