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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626364656667686970717273747576777879808182838485868788899091929394// 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 boolstring_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_ACCOUNT, 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);