Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / netfilter / xt_string.c

diff --git a/kernel/net/netfilter/xt_string.c b/kernel/net/netfilter/xt_string.c
new file mode 100644 (file)
index 0000000..0bc3460
--- /dev/null
+++ b/kernel/net/netfilter/xt_string.c
@@ -0,0 +1,94 @@
+/* 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;
+}
+
+#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),
+       .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);