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
|
/*
* (C) 2006-2007 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.
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "jhash.h"
#include "hash.h"
#include "conntrackd.h"
#include "ignore.h"
#include "log.h"
#include <libnetfilter_conntrack/libnetfilter_conntrack.h>
#include <stdlib.h>
/* XXX: These should be configurable */
#define IGNORE_POOL_SIZE 128
#define IGNORE_POOL_LIMIT INT_MAX
static uint32_t hash(const void *data, struct hashtable *table)
{
const uint32_t *ip = data;
return jhash_1word(*ip, 0) % table->hashsize;
}
static uint32_t hash6(const void *data, struct hashtable *table)
{
return jhash(data, sizeof(uint32_t)*4, 0) % table->hashsize;
}
static int compare(const void *data1, const void *data2)
{
const uint32_t *ip1 = data1;
const uint32_t *ip2 = data2;
return *ip1 == *ip2;
}
static int compare6(const void *data1, const void *data2)
{
return memcmp(data1, data2, sizeof(uint32_t)*4) == 0;
}
struct ignore_pool *ignore_pool_create(uint8_t proto)
{
struct ignore_pool *ip;
ip = malloc(sizeof(struct ignore_pool));
if (!ip)
return NULL;
memset(ip, 0, sizeof(struct ignore_pool));
switch(proto) {
case AF_INET:
ip->h = hashtable_create(IGNORE_POOL_SIZE,
IGNORE_POOL_LIMIT,
sizeof(uint32_t),
hash,
compare);
break;
case AF_INET6:
ip->h = hashtable_create(IGNORE_POOL_SIZE,
IGNORE_POOL_LIMIT,
sizeof(uint32_t)*4,
hash6,
compare6);
break;
}
if (!ip->h) {
free(ip);
return NULL;
}
return ip;
}
void ignore_pool_destroy(struct ignore_pool *ip)
{
hashtable_destroy(ip->h);
free(ip);
}
int ignore_pool_add(struct ignore_pool *ip, void *data)
{
if (!hashtable_add(ip->h, data))
return 0;
return 1;
}
static int
__ignore_pool_test_ipv4(struct ignore_pool *ip, struct nf_conntrack *ct)
{
return (hashtable_test(ip->h, nfct_get_attr(ct, ATTR_ORIG_IPV4_SRC)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_ORIG_IPV4_DST)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_REPL_IPV4_SRC)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_REPL_IPV4_DST)));
}
static int
__ignore_pool_test_ipv6(struct ignore_pool *ip, struct nf_conntrack *ct)
{
return (hashtable_test(ip->h, nfct_get_attr(ct, ATTR_ORIG_IPV6_SRC)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_ORIG_IPV6_DST)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_REPL_IPV6_SRC)) ||
hashtable_test(ip->h, nfct_get_attr(ct, ATTR_REPL_IPV6_DST)));
}
int ignore_pool_test(struct ignore_pool *ip, struct nf_conntrack *ct)
{
int ret = 0;
switch(nfct_get_attr_u8(ct, ATTR_ORIG_L3PROTO)) {
case AF_INET:
ret = __ignore_pool_test_ipv4(ip, ct);
break;
case AF_INET6:
ret = __ignore_pool_test_ipv6(ip, ct);
break;
default:
dlog(STATE(log), LOG_WARNING, "unknown layer 3 protocol?");
break;
}
return ret;
}
|
