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
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
|
/*
* Copyright (C) 2009 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* 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. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#include "ha_kernel.h"
typedef u_int32_t u32;
typedef u_int8_t u8;
#include <linux/jhash.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#define CLUSTERIP_DIR "/proc/net/ipt_CLUSTERIP"
typedef struct private_ha_kernel_t private_ha_kernel_t;
/**
* Private data of an ha_kernel_t object.
*/
struct private_ha_kernel_t {
/**
* Public ha_kernel_t interface.
*/
ha_kernel_t public;
/**
* Init value for jhash
*/
u_int initval;
/**
* Total number of ClusterIP segments
*/
u_int count;
};
/**
* Implementation of ha_kernel_t.in_segment
*/
static bool in_segment(private_ha_kernel_t *this, host_t *host, u_int segment)
{
if (host->get_family(host) == AF_INET)
{
unsigned long hash;
u_int32_t addr;
addr = *(u_int32_t*)host->get_address(host).ptr;
hash = jhash_1word(ntohl(addr), this->initval);
if ((((u_int64_t)hash * this->count) >> 32) + 1 == segment)
{
return TRUE;
}
}
return FALSE;
}
/**
* Activate/Deactivate a segment for a given clusterip file
*/
static void enable_disable(private_ha_kernel_t *this, u_int segment,
char *file, bool enable)
{
char cmd[8];
int fd;
snprintf(cmd, sizeof(cmd), "%c%d\n", enable ? '+' : '-', segment);
fd = open(file, O_WRONLY);
if (fd == -1)
{
DBG1(DBG_CFG, "opening CLUSTERIP file '%s' failed: %s",
file, strerror(errno));
return;
}
if (write(fd, cmd, strlen(cmd) == -1))
{
DBG1(DBG_CFG, "writing to CLUSTERIP file '%s' failed: %s",
file, strerror(errno));
}
close(fd);
}
/**
* Get the currenlty active segments in the kernel for a clusterip file
*/
static segment_mask_t get_active(private_ha_kernel_t *this, char *file)
{
char buf[256];
segment_mask_t mask = 0;
ssize_t len;
int fd;
fd = open(file, O_RDONLY);
if (fd == -1)
{
DBG1(DBG_CFG, "opening CLUSTERIP file '%s' failed: %s",
file, strerror(errno));
return 0;
}
len = read(fd, buf, sizeof(buf)-1);
if (len == -1)
{
DBG1(DBG_CFG, "reading from CLUSTERIP file '%s' failed: %s",
file, strerror(errno));
}
else
{
enumerator_t *enumerator;
u_int segment;
char *token;
buf[len] = '\0';
enumerator = enumerator_create_token(buf, ",", " ");
while (enumerator->enumerate(enumerator, &token))
{
segment = atoi(token);
if (segment)
{
mask |= SEGMENTS_BIT(segment);
}
}
enumerator->destroy(enumerator);
}
return mask;
}
/**
* Implementation of ha_kernel_t.activate
*/
static void activate(private_ha_kernel_t *this, u_int segment)
{
enumerator_t *enumerator;
char *file;
enumerator = enumerator_create_directory(CLUSTERIP_DIR);
while (enumerator->enumerate(enumerator, NULL, &file, NULL))
{
enable_disable(this, segment, file, TRUE);
}
enumerator->destroy(enumerator);
}
/**
* Implementation of ha_kernel_t.deactivate
*/
static void deactivate(private_ha_kernel_t *this, u_int segment)
{
enumerator_t *enumerator;
char *file;
enumerator = enumerator_create_directory(CLUSTERIP_DIR);
while (enumerator->enumerate(enumerator, NULL, &file, NULL))
{
enable_disable(this, segment, file, FALSE);
}
enumerator->destroy(enumerator);
}
/**
* Disable all not-yet disabled segments on all clusterip addresses
*/
static void disable_all(private_ha_kernel_t *this)
{
enumerator_t *enumerator;
segment_mask_t active;
char *file;
int i;
enumerator = enumerator_create_directory(CLUSTERIP_DIR);
while (enumerator->enumerate(enumerator, NULL, &file, NULL))
{
active = get_active(this, file);
for (i = 1; i <= this->count; i++)
{
if (active & SEGMENTS_BIT(i))
{
enable_disable(this, i, file, FALSE);
}
}
}
enumerator->destroy(enumerator);
}
/**
* Implementation of ha_kernel_t.destroy.
*/
static void destroy(private_ha_kernel_t *this)
{
free(this);
}
/**
* See header
*/
ha_kernel_t *ha_kernel_create(u_int count)
{
private_ha_kernel_t *this = malloc_thing(private_ha_kernel_t);
this->public.in_segment = (bool(*)(ha_kernel_t*, host_t *host, u_int segment))in_segment;
this->public.activate = (void(*)(ha_kernel_t*, u_int segment))activate;
this->public.deactivate = (void(*)(ha_kernel_t*, u_int segment))deactivate;
this->public.destroy = (void(*)(ha_kernel_t*))destroy;
this->initval = 0;
this->count = count;
disable_all(this);
return &this->public;
}
|
