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
|
/*
* OpenVPN -- An application to securely tunnel IP networks
* over a single TCP/UDP port, with support for SSL/TLS-based
* session authentication and key exchange,
* packet encryption, packet authentication, and
* packet compression.
*
* Copyright (C) 2002-2010 OpenVPN Technologies, Inc. <sales@openvpn.net>
*
* 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 (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#elif defined(_MSC_VER)
#include "config-msvc.h"
#endif
#include "syshead.h"
#if P2MP
#include "buffer.h"
#include "error.h"
#include "misc.h"
#include "mbuf.h"
#include "memdbg.h"
struct mbuf_set *
mbuf_init (unsigned int size)
{
struct mbuf_set *ret;
ALLOC_OBJ_CLEAR (ret, struct mbuf_set);
ret->capacity = adjust_power_of_2 (size);
ALLOC_ARRAY (ret->array, struct mbuf_item, ret->capacity);
return ret;
}
void
mbuf_free (struct mbuf_set *ms)
{
if (ms)
{
int i;
for (i = 0; i < (int) ms->len; ++i)
{
struct mbuf_item *item = &ms->array[MBUF_INDEX(ms->head, i, ms->capacity)];
mbuf_free_buf (item->buffer);
}
free (ms->array);
free (ms);
}
}
struct mbuf_buffer *
mbuf_alloc_buf (const struct buffer *buf)
{
struct mbuf_buffer *ret;
ALLOC_OBJ (ret, struct mbuf_buffer);
ret->buf = clone_buf (buf);
ret->refcount = 1;
ret->flags = 0;
return ret;
}
void
mbuf_free_buf (struct mbuf_buffer *mb)
{
if (mb)
{
if (--mb->refcount <= 0)
{
free_buf (&mb->buf);
free (mb);
}
}
}
void
mbuf_add_item (struct mbuf_set *ms, const struct mbuf_item *item)
{
ASSERT (ms);
if (ms->len == ms->capacity)
{
struct mbuf_item rm;
ASSERT (mbuf_extract_item (ms, &rm));
mbuf_free_buf (rm.buffer);
msg (D_MULTI_DROPPED, "MBUF: mbuf packet dropped");
}
ASSERT (ms->len < ms->capacity);
ms->array[MBUF_INDEX(ms->head, ms->len, ms->capacity)] = *item;
if (++ms->len > ms->max_queued)
ms->max_queued = ms->len;
++item->buffer->refcount;
}
bool
mbuf_extract_item (struct mbuf_set *ms, struct mbuf_item *item)
{
bool ret = false;
if (ms)
{
while (ms->len)
{
*item = ms->array[ms->head];
ms->head = MBUF_INDEX(ms->head, 1, ms->capacity);
--ms->len;
if (item->instance) /* ignore dereferenced instances */
{
ret = true;
break;
}
}
}
return ret;
}
struct multi_instance *
mbuf_peek_dowork (struct mbuf_set *ms)
{
struct multi_instance *ret = NULL;
if (ms)
{
int i;
for (i = 0; i < (int) ms->len; ++i)
{
struct mbuf_item *item = &ms->array[MBUF_INDEX(ms->head, i, ms->capacity)];
if (item->instance)
{
ret = item->instance;
break;
}
}
}
return ret;
}
void
mbuf_dereference_instance (struct mbuf_set *ms, struct multi_instance *mi)
{
if (ms)
{
int i;
for (i = 0; i < (int) ms->len; ++i)
{
struct mbuf_item *item = &ms->array[MBUF_INDEX(ms->head, i, ms->capacity)];
if (item->instance == mi)
{
mbuf_free_buf (item->buffer);
item->buffer = NULL;
item->instance = NULL;
msg (D_MBUF, "MBUF: dereferenced queued packet");
}
}
}
}
#else
static void dummy(void) {}
#endif /* P2MP */
|
