1 /************************************************************************
2 * RSTP library - Rapid Spanning Tree (802.1t, 802.1w)
3 * Copyright (C) 2001-2003 Optical Access
4 * Author: Alex Rozin
5 *
6 * This file is part of RSTP library.
7 *
8 * RSTP library is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU Lesser General Public License as published by the
10 * Free Software Foundation; version 2.1
11 *
12 * RSTP library is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser
15 * General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with RSTP library; see the file COPYING. If not, write to the Free
19 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
20 * 02111-1307, USA.
21 **********************************************************************/
22
23 /* "Times" API : bridgeTime, rootTimes, portTimes, designatedTimes, msgTimes */
24
25 #include "base.h"
26
27 int
STP_compare_times(IN TIMEVALUES_T * t1,IN TIMEVALUES_T * t2)28 STP_compare_times (IN TIMEVALUES_T *t1, IN TIMEVALUES_T *t2)
29 {
30 if (t1->MessageAge < t2->MessageAge) return -1;
31 if (t1->MessageAge > t2->MessageAge) return 1;
32
33 if (t1->MaxAge < t2->MaxAge) return -2;
34 if (t1->MaxAge > t2->MaxAge) return 2;
35
36 if (t1->ForwardDelay < t2->ForwardDelay) return -3;
37 if (t1->ForwardDelay > t2->ForwardDelay) return 3;
38
39 if (t1->HelloTime < t2->HelloTime) return -4;
40 if (t1->HelloTime > t2->HelloTime) return 4;
41
42 return 0;
43 }
44
45 void
STP_get_times(IN BPDU_BODY_T * b,OUT TIMEVALUES_T * v)46 STP_get_times (IN BPDU_BODY_T *b, OUT TIMEVALUES_T *v)
47 {
48 /* LINTED: alignment */
49 v->MessageAge = ntohs (*((unsigned short*) b->message_age)) >> 8;
50 /* LINTED: alignment */
51 v->MaxAge = ntohs (*((unsigned short*) b->max_age)) >> 8;
52 /* LINTED: alignment */
53 v->ForwardDelay = ntohs (*((unsigned short*) b->forward_delay)) >> 8;
54 /* LINTED: alignment */
55 v->HelloTime = ntohs (*((unsigned short*) b->hello_time)) >> 8;
56 }
57
58 void
STP_set_times(IN TIMEVALUES_T * v,OUT BPDU_BODY_T * b)59 STP_set_times (IN TIMEVALUES_T *v, OUT BPDU_BODY_T *b)
60 {
61 unsigned short mt;
62 #define STP_SET_TIME(f, t) \
63 mt = htons (f << 8); \
64 (void) memcpy (t, &mt, 2);
65
66 STP_SET_TIME(v->MessageAge, b->message_age);
67 STP_SET_TIME(v->MaxAge, b->max_age);
68 STP_SET_TIME(v->ForwardDelay, b->forward_delay);
69 STP_SET_TIME(v->HelloTime, b->hello_time);
70 }
71
72 void
STP_copy_times(OUT TIMEVALUES_T * t,IN TIMEVALUES_T * f)73 STP_copy_times (OUT TIMEVALUES_T *t, IN TIMEVALUES_T *f)
74 {
75 t->MessageAge = f->MessageAge;
76 t->MaxAge = f->MaxAge;
77 t->ForwardDelay = f->ForwardDelay;
78 t->HelloTime = f->HelloTime;
79 }
80
81