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
189
190
191
192
193
194
195
196
197
198
199
200
201
|
/*
* (C) 2009 by Pablo Neira Ayuso <pablo@netfilter.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <stdlib.h>
#include <unistd.h>
#include <net/if.h>
#include <string.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include "channel.h"
#include "network.h"
static struct channel_ops *ops[CHANNEL_MAX];
extern struct channel_ops channel_mcast;
extern struct channel_ops channel_udp;
extern struct channel_ops channel_tcp;
void channel_init(void)
{
ops[CHANNEL_MCAST] = &channel_mcast;
ops[CHANNEL_UDP] = &channel_udp;
ops[CHANNEL_TCP] = &channel_tcp;
}
struct channel_buffer {
char *data;
int size;
int len;
};
static struct channel_buffer *
channel_buffer_open(int mtu, int headersiz)
{
struct channel_buffer *b;
b = calloc(sizeof(struct channel_buffer), 1);
if (b == NULL)
return NULL;
b->size = mtu - headersiz;
b->data = malloc(b->size);
if (b->data == NULL) {
free(b);
return NULL;
}
return b;
}
static void
channel_buffer_close(struct channel_buffer *b)
{
if (b == NULL)
return;
free(b->data);
free(b);
}
struct channel *
channel_open(struct channel_conf *cfg)
{
struct channel *c;
struct ifreq ifr;
int fd;
if (cfg->channel_type >= CHANNEL_MAX)
return NULL;
if (!cfg->channel_ifname[0])
return NULL;
if (cfg->channel_flags >= CHANNEL_F_MAX)
return NULL;
c = calloc(sizeof(struct channel), 1);
if (c == NULL)
return NULL;
c->channel_type = cfg->channel_type;
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd == -1) {
free(c);
return NULL;
}
strncpy(ifr.ifr_name, cfg->channel_ifname, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFMTU, &ifr) == -1) {
free(c);
return NULL;
}
close(fd);
c->channel_ifmtu = ifr.ifr_mtu;
c->channel_ifindex = if_nametoindex(cfg->channel_ifname);
if (c->channel_ifindex == 0) {
free(c);
return NULL;
}
c->ops = ops[cfg->channel_type];
if (cfg->channel_flags & CHANNEL_F_BUFFERED) {
c->buffer = channel_buffer_open(c->channel_ifmtu,
c->ops->headersiz);
if (c->buffer == NULL) {
free(c);
return NULL;
}
}
c->channel_flags = cfg->channel_flags;
c->data = c->ops->open(&cfg->u);
if (c->data == NULL) {
channel_buffer_close(c->buffer);
free(c);
return NULL;
}
return c;
}
void
channel_close(struct channel *c)
{
c->ops->close(c->data);
if (c->channel_flags & CHANNEL_F_BUFFERED)
channel_buffer_close(c->buffer);
free(c);
}
int channel_send(struct channel *c, const struct nethdr *net)
{
int ret = 0, len = ntohs(net->len);
if (!(c->channel_flags & CHANNEL_F_BUFFERED)) {
c->ops->send(c->data, net, len);
return 1;
}
retry:
if (c->buffer->len + len < c->buffer->size) {
memcpy(c->buffer->data + c->buffer->len, net, len);
c->buffer->len += len;
} else {
c->ops->send(c->data, c->buffer->data, c->buffer->len);
ret = 1;
c->buffer->len = 0;
goto retry;
}
return ret;
}
int channel_send_flush(struct channel *c)
{
if (!(c->channel_flags & CHANNEL_F_BUFFERED) || c->buffer->len == 0)
return 0;
c->ops->send(c->data, c->buffer->data, c->buffer->len);
c->buffer->len = 0;
return 1;
}
int channel_recv(struct channel *c, char *buf, int size)
{
return c->ops->recv(c->data, buf, size);
}
int channel_get_fd(struct channel *c)
{
return c->ops->get_fd(c->data);
}
void channel_stats(struct channel *c, int fd)
{
return c->ops->stats(c, fd);
}
void channel_stats_extended(struct channel *c, int active,
struct nlif_handle *h, int fd)
{
return c->ops->stats_extended(c, active, h, fd);
}
int channel_accept_isset(struct channel *c, fd_set *readfds)
{
return c->ops->accept_isset(c, readfds);
}
int channel_isset(struct channel *c, fd_set *readfds)
{
return c->ops->isset(c, readfds);
}
int channel_accept(struct channel *c)
{
return c->ops->accept(c);
}
|
