cregit-Linux how code gets into the kernel

Release 4.14 net/netfilter/xt_string.c

Directory: net/netfilter
/* String matching match for iptables
 *
 * (C) 2005 Pablo Neira Ayuso <pablo@eurodev.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.
 */

#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");


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; }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso4766.20%110.00%
Joonwoo Park1419.72%110.00%
Jan Engelhardt79.86%550.00%
Harald Welte11.41%110.00%
Patrick McHardy11.41%110.00%
Phil Oester11.41%110.00%
Total71100.00%10100.00%

#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; }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso6743.23%110.00%
Joonwoo Park4126.45%110.00%
Patrick McHardy2717.42%220.00%
Jan Engelhardt1912.26%550.00%
Harald Welte10.65%110.00%
Total155100.00%10100.00%


static void string_mt_destroy(const struct xt_mtdtor_param *par) { textsearch_destroy(STRING_TEXT_PRIV(par->matchinfo)->config); }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso1770.83%125.00%
Jan Engelhardt520.83%250.00%
Patrick McHardy28.33%125.00%
Total24100.00%4100.00%

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); }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso1168.75%120.00%
Jan Engelhardt425.00%360.00%
Patrick McHardy16.25%120.00%
Total16100.00%5100.00%


static void __exit string_mt_exit(void) { xt_unregister_match(&xt_string_mt_reg); }

Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso853.33%116.67%
Jan Engelhardt426.67%350.00%
Harald Welte213.33%116.67%
Patrick McHardy16.67%116.67%
Total15100.00%6100.00%

module_init(string_mt_init); module_exit(string_mt_exit);

Overall Contributors

PersonTokensPropCommitsCommitProp
Pablo Neira Ayuso20549.88%27.41%
Joonwoo Park6616.06%13.70%
Jan Engelhardt4811.68%1348.15%
Patrick McHardy4611.19%622.22%
Harald Welte307.30%13.70%
Willem de Bruijn112.68%13.70%
Tejun Heo30.73%13.70%
Phil Oester10.24%13.70%
Hideaki Yoshifuji / 吉藤英明10.24%13.70%
Total411100.00%27100.00%
Directory: net/netfilter
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