1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
|
#include <assert.h>
#include <rtqueue.h>
#include <cmu-trace.h>
#define CURRENT_TIME Scheduler::instance().clock()
#define DEBUG
/* ======================================================================
Packet Queue used by TORA and AODV.
===================================================================== */
rtqueue::rtqueue()
{
head_ = tail_ = 0;
len_ = 0;
limit_ = RTQ_MAX_LEN;
timeout_ = RTQ_TIMEOUT;
}
void
rtqueue::enque(Packet *p)
{
struct hdr_cmn *ch = HDR_CMN(p);
p->next_ = 0;
ch->ts_ = CURRENT_TIME + timeout_;
if (len_ == limit_) {
Packet *p0 = remove_head(); // decrements len_
assert(p0);
if(HDR_CMN(p0)->ts_ > CURRENT_TIME) {
drop(p0, DROP_RTR_QFULL);
}
else {
drop(p0, DROP_RTR_QTIMEOUT);
}
}
if(head_ == 0) {
head_ = tail_ = p;
}
else {
tail_->next_ = p;
tail_ = p;
}
len_++;
#ifdef DEBUG
verifyQueue();
#endif
}
Packet*
rtqueue::deque()
{
Packet *p;
/*
* Purge any packets that have timed out.
*/
purge();
p = remove_head();
#ifdef DEBUG
verifyQueue();
#endif
return p;
}
Packet*
rtqueue::deque(nsaddr_t dst)
{
Packet *p, *prev;
/*
* Purge any packets that have timed out.
*/
purge();
findPacketWithDst(dst, p, prev);
assert(p == 0 || (p == head_ && prev == 0) || (prev->next_ == p));
if(p == 0) return 0;
if (p == head_) {
p = remove_head();
}
else if (p == tail_) {
prev->next_ = 0;
tail_ = prev;
len_--;
}
else {
prev->next_ = p->next_;
len_--;
}
#ifdef DEBUG
verifyQueue();
#endif
return p;
}
char
rtqueue::find(nsaddr_t dst)
{
Packet *p, *prev;
findPacketWithDst(dst, p, prev);
if (0 == p)
return 0;
else
return 1;
}
/* ======================================================================
Private Routines
====================================================================== */
Packet*
rtqueue::remove_head()
{
Packet *p = head_;
if(head_ == tail_) {
head_ = tail_ = 0;
}
else {
head_ = head_->next_;
}
if(p) len_--;
return p;
}
void
rtqueue::purge()
{
Packet *p;
while((p = head_) && HDR_CMN(p)->ts_ < CURRENT_TIME) {
Packet *temp;
temp = remove_head();
assert(p == temp);
drop(p, DROP_RTR_QTIMEOUT);
}
}
void
rtqueue::findPacketWithDst(nsaddr_t dst, Packet*& p, Packet*& prev)
{
p = prev = 0;
for(p = head_; p; p = p->next_) {
// if(HDR_IP(p)->dst() == dst) {
if(HDR_IP(p)->daddr() == dst) {
return;
}
prev = p;
}
if(p == 0) prev = 0; // not found
}
void
rtqueue::verifyQueue()
{
Packet *p, *prev = 0;
int cnt = 0;
for(p = head_; p; p = p->next_) {
cnt++;
prev = p;
}
assert(cnt == len_);
assert(prev == tail_);
}
|
