Contributors: 10
| Author |
Tokens |
Token Proportion |
Commits |
Commit Proportion |
| Pablo Neira Ayuso |
216 |
51.80% |
2 |
7.14% |
| Joonwoo Park |
60 |
14.39% |
1 |
3.57% |
| Jan Engelhardt |
48 |
11.51% |
13 |
46.43% |
| Patrick McHardy |
40 |
9.59% |
6 |
21.43% |
| Harald Welte |
31 |
7.43% |
1 |
3.57% |
| Willem de Bruijn |
11 |
2.64% |
1 |
3.57% |
| Bernie Harris |
5 |
1.20% |
1 |
3.57% |
| Avi Kivity |
3 |
0.72% |
1 |
3.57% |
| Thomas Gleixner |
2 |
0.48% |
1 |
3.57% |
| Phil Oester |
1 |
0.24% |
1 |
3.57% |
| Total |
417 |
|
28 |
|
// SPDX-License-Identifier: GPL-2.0-only
/* String matching match for iptables
*
* (C) 2005 Pablo Neira Ayuso <pablo@eurodev.net>
*/
#include <linux/gfp.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/skbuff.h>
#include <linux/netfilter/x_tables.h>
#include <linux/netfilter/xt_string.h>
#include <linux/textsearch.h>
MODULE_AUTHOR("Pablo Neira Ayuso <pablo@eurodev.net>");
MODULE_DESCRIPTION("Xtables: string-based matching");
MODULE_LICENSE("GPL");
MODULE_ALIAS("ipt_string");
MODULE_ALIAS("ip6t_string");
MODULE_ALIAS("ebt_string");
static bool
string_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
const struct xt_string_info *conf = par->matchinfo;
bool invert;
invert = conf->u.v1.flags & XT_STRING_FLAG_INVERT;
return (skb_find_text((struct sk_buff *)skb, conf->from_offset,
conf->to_offset, conf->config)
!= UINT_MAX) ^ invert;
}
#define STRING_TEXT_PRIV(m) ((struct xt_string_info *)(m))
static int string_mt_check(const struct xt_mtchk_param *par)
{
struct xt_string_info *conf = par->matchinfo;
struct ts_config *ts_conf;
int flags = TS_AUTOLOAD;
/* Damn, can't handle this case properly with iptables... */
if (conf->from_offset > conf->to_offset)
return -EINVAL;
if (conf->algo[XT_STRING_MAX_ALGO_NAME_SIZE - 1] != '\0')
return -EINVAL;
if (conf->patlen > XT_STRING_MAX_PATTERN_SIZE)
return -EINVAL;
if (conf->u.v1.flags &
~(XT_STRING_FLAG_IGNORECASE | XT_STRING_FLAG_INVERT))
return -EINVAL;
if (conf->u.v1.flags & XT_STRING_FLAG_IGNORECASE)
flags |= TS_IGNORECASE;
ts_conf = textsearch_prepare(conf->algo, conf->pattern, conf->patlen,
GFP_KERNEL, flags);
if (IS_ERR(ts_conf))
return PTR_ERR(ts_conf);
conf->config = ts_conf;
return 0;
}
static void string_mt_destroy(const struct xt_mtdtor_param *par)
{
textsearch_destroy(STRING_TEXT_PRIV(par->matchinfo)->config);
}
static struct xt_match xt_string_mt_reg __read_mostly = {
.name = "string",
.revision = 1,
.family = NFPROTO_UNSPEC,
.checkentry = string_mt_check,
.match = string_mt,
.destroy = string_mt_destroy,
.matchsize = sizeof(struct xt_string_info),
.usersize = offsetof(struct xt_string_info, config),
.me = THIS_MODULE,
};
static int __init string_mt_init(void)
{
return xt_register_match(&xt_string_mt_reg);
}
static void __exit string_mt_exit(void)
{
xt_unregister_match(&xt_string_mt_reg);
}
module_init(string_mt_init);
module_exit(string_mt_exit);