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
186
187
188
|
/* -*- Mode:C++; c-basic-offset:8; tab-width:8; indent-tabs-mode:t -*- */
/*
* Copyright (C) 1998 by the University of Southern California
* $Id: filter.cc,v 1.8 2005/08/25 18:58:02 johnh Exp $
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* 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.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*
*
* The copyright of this module includes the following
* linking-with-specific-other-licenses addition:
*
* In addition, as a special exception, the copyright holders of
* this module give you permission to combine (via static or
* dynamic linking) this module with free software programs or
* libraries that are released under the GNU LGPL and with code
* included in the standard release of ns-2 under the Apache 2.0
* license or under otherwise-compatible licenses with advertising
* requirements (or modified versions of such code, with unchanged
* license). You may copy and distribute such a system following the
* terms of the GNU GPL for this module and the licenses of the
* other code concerned, provided that you include the source code of
* that other code when and as the GNU GPL requires distribution of
* source code.
*
* Note that people who make modified versions of this module
* are not obligated to grant this special exception for their
* modified versions; it is their choice whether to do so. The GNU
* General Public License gives permission to release a modified
* version without this exception; this exception also makes it
* possible to release a modified version which carries forward this
* exception.
*
*/
#ifndef lint
static const char rcsid[] =
"@(#) $Header: /usr/src/mash/repository/vint/ns-2/filter.cc ";
#endif
#include "packet.h"
#include "filter.h"
static class FilterClass : public TclClass {
public:
FilterClass() : TclClass("Filter") {}
TclObject* create(int, const char*const*) {
return (new Filter);
}
} class_filter;
Filter::Filter() : filter_target_(0)
{
}
Filter::filter_e Filter::filter(Packet* /*p*/)
{
return PASS; // As simple connector
}
void Filter::recv(Packet* p, Handler* h)
{
switch(filter(p)) {
case DROP :
if (h) h->handle(p);
drop(p);
break;
case DUPLIC :
if (filter_target_)
filter_target_->recv(p->copy(), h);
/* fallthrough */
case PASS :
send(p, h);
break;
case FILTER :
if (filter_target_)
filter_target_->recv(p, h);
break;
}
}
int Filter::command(int argc, const char*const* argv)
{
Tcl& tcl = Tcl::instance();
if (argc == 2) {
if (strcmp(argv[1], "filter-target") == 0) {
if (filter_target_ != 0)
tcl.result(target_->name());
return TCL_OK;
}
}
else if (argc == 3) {
if (strcmp(argv[1], "filter-target") == 0) {
filter_target_ = (NsObject*)TclObject::lookup(argv[2]);
return TCL_OK;
}
}
return Connector::command(argc, argv);
}
static class FieldFilterClass : public TclClass {
public:
FieldFilterClass() : TclClass("Filter/Field") {}
TclObject* create(int, const char*const*) {
return (new FieldFilter);
}
} class_filter_field;
FieldFilter::FieldFilter()
{
bind("offset_", &offset_);
bind("match_", &match_);
}
Filter::filter_e FieldFilter::filter(Packet *p)
{
return (*(int *)p->access(offset_) == match_) ? FILTER : PASS;
}
/* 10-5-98, Polly Huang, Filters that filter on multiple fields */
static class MultiFieldFilterClass : public TclClass {
public:
MultiFieldFilterClass() : TclClass("Filter/MultiField") {}
TclObject* create(int, const char*const*) {
return (new MultiFieldFilter);
}
} class_filter_multifield;
MultiFieldFilter::MultiFieldFilter() : field_list_(0)
{
}
void MultiFieldFilter::add_field(fieldobj *p)
{
p->next = field_list_;
field_list_ = p;
}
MultiFieldFilter::filter_e MultiFieldFilter::filter(Packet *p)
{
fieldobj* tmpfield;
tmpfield = field_list_;
while (tmpfield != 0) {
if (*(int *)p->access(tmpfield->offset) == tmpfield->match)
tmpfield = tmpfield->next;
else
return (PASS);
}
return(FILTER);
}
int MultiFieldFilter::command(int argc, const char*const* argv)
{
Tcl& tcl = Tcl::instance();
if (argc == 2) {
if (strcmp(argv[1], "filter-target") == 0) {
if (filter_target_ != 0)
tcl.result(target_->name());
return TCL_OK;
}
}
else if (argc == 3) {
if (strcmp(argv[1], "filter-target") == 0) {
filter_target_ = (NsObject*)TclObject::lookup(argv[2]);
return TCL_OK;
}
}
else if (argc == 4) {
if (strcmp(argv[1], "filter-field") == 0) {
fieldobj *tmp = new fieldobj;
tmp->offset = atoi(argv[2]);
tmp->match = atoi(argv[3]);
add_field(tmp);
return TCL_OK;
}
}
return Connector::command(argc, argv);
}
|
