---- linux/net/ipv4/netfilter/Config.in.org 2005-11-08 23:11:47.011929664 +0100
-+++ linux/net/ipv4/netfilter/Config.in 2005-11-08 23:10:33.329131152 +0100
-@@ -50,6 +50,7 @@
+diff -Nur linux-2.4.32/include/linux/netfilter_ipv4/ipt_string.h linux-2.4.32.patch/include/linux/netfilter_ipv4/ipt_string.h
+--- linux-2.4.32/include/linux/netfilter_ipv4/ipt_string.h 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.4.32.patch/include/linux/netfilter_ipv4/ipt_string.h 2005-12-16 00:40:19.082509250 +0100
+@@ -0,0 +1,18 @@
++#ifndef _IPT_STRING_H
++#define _IPT_STRING_H
++
++#define IPT_STRING_MAX_PATTERN_SIZE 128
++#define IPT_STRING_MAX_ALGO_NAME_SIZE 16
++
++struct ipt_string_info
++{
++ u_int16_t from_offset;
++ u_int16_t to_offset;
++ char algo[IPT_STRING_MAX_ALGO_NAME_SIZE];
++ char pattern[IPT_STRING_MAX_PATTERN_SIZE];
++ u_int8_t patlen;
++ u_int8_t invert;
++ struct ts_config __attribute__((aligned(8))) *config;
++};
++
++#endif /*_IPT_STRING_H*/
+diff -Nur linux-2.4.32/include/linux/textsearch.h linux-2.4.32.patch/include/linux/textsearch.h
+--- linux-2.4.32/include/linux/textsearch.h 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.4.32.patch/include/linux/textsearch.h 2005-12-16 11:15:34.838073000 +0100
+@@ -0,0 +1,205 @@
++#ifndef __LINUX_TEXTSEARCH_H
++#define __LINUX_TEXTSEARCH_H
++
++#ifdef __KERNEL__
++
++#include <linux/types.h>
++#include <linux/list.h>
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/slab.h>
++
++#ifdef __CHECKER__
++#define __bitwise__ __attribute__((bitwise))
++#else
++#define __bitwise__
++#endif
++#ifdef __CHECK_ENDIAN__
++#define __bitwise __bitwise__
++#else
++#define __bitwise
++#endif
++
++typedef __u16 __bitwise __le16;
++typedef __u16 __bitwise __be16;
++typedef __u32 __bitwise __le32;
++typedef __u32 __bitwise __be32;
++#if defined(__GNUC__) && !defined(__STRICT_ANSI__)
++typedef __u64 __bitwise __le64;
++typedef __u64 __bitwise __be64;
++#endif
++
++#ifdef __KERNEL__
++typedef unsigned __bitwise__ gfp_t;
++#endif
++
++struct ts_config;
++
++/**
++ * TS_AUTOLOAD - Automatically load textsearch modules when needed
++ */
++#define TS_AUTOLOAD 1
++
++/**
++ * struct ts_state - search state
++ * @offset: offset for next match
++ * @cb: control buffer, for persistant variables of get_next_block()
++ */
++struct ts_state
++{
++ unsigned int offset;
++ char cb[40];
++};
++
++/**
++ * struct ts_ops - search module operations
++ * @name: name of search algorithm
++ * @init: initialization function to prepare a search
++ * @find: find the next occurrence of the pattern
++ * @destroy: destroy algorithm specific parts of a search configuration
++ * @get_pattern: return head of pattern
++ * @get_pattern_len: return length of pattern
++ * @owner: module reference to algorithm
++ */
++struct ts_ops
++{
++ const char *name;
++ struct ts_config * (*init)(const void *, unsigned int, gfp_t);
++ unsigned int (*find)(struct ts_config *,
++ struct ts_state *);
++ void (*destroy)(struct ts_config *);
++ void * (*get_pattern)(struct ts_config *);
++ unsigned int (*get_pattern_len)(struct ts_config *);
++ struct module *owner;
++ struct list_head list;
++};
++
++/**
++ * struct ts_config - search configuration
++ * @ops: operations of chosen algorithm
++ * @get_next_block: callback to fetch the next block to search in
++ * @finish: callback to finalize a search
++ */
++struct ts_config
++{
++ struct ts_ops *ops;
++
++ /**
++ * get_next_block - fetch next block of data
++ * @consumed: number of bytes consumed by the caller
++ * @dst: destination buffer
++ * @conf: search configuration
++ * @state: search state
++ *
++ * Called repeatedly until 0 is returned. Must assign the
++ * head of the next block of data to &*dst and return the length
++ * of the block or 0 if at the end. consumed == 0 indicates
++ * a new search. May store/read persistant values in state->cb.
++ */
++ unsigned int (*get_next_block)(unsigned int consumed,
++ const u8 **dst,
++ struct ts_config *conf,
++ struct ts_state *state);
++
++ /**
++ * finish - finalize/clean a series of get_next_block() calls
++ * @conf: search configuration
++ * @state: search state
++ *
++ * Called after the last use of get_next_block(), may be used
++ * to cleanup any leftovers.
++ */
++ void (*finish)(struct ts_config *conf,
++ struct ts_state *state);
++};
++
++/**
++ * textsearch_next - continue searching for a pattern
++ * @conf: search configuration
++ * @state: search state
++ *
++ * Continues a search looking for more occurrences of the pattern.
++ * textsearch_find() must be called to find the first occurrence
++ * in order to reset the state.
++ *
++ * Returns the position of the next occurrence of the pattern or
++ * UINT_MAX if not match was found.
++ */
++static inline unsigned int textsearch_next(struct ts_config *conf,
++ struct ts_state *state)
++{
++ unsigned int ret = conf->ops->find(conf, state);
++
++ if (conf->finish)
++ conf->finish(conf, state);
++
++ return ret;
++}
++
++/**
++ * textsearch_find - start searching for a pattern
++ * @conf: search configuration
++ * @state: search state
++ *
++ * Returns the position of first occurrence of the pattern or
++ * UINT_MAX if no match was found.
++ */
++static inline unsigned int textsearch_find(struct ts_config *conf,
++ struct ts_state *state)
++{
++ state->offset = 0;
++ return textsearch_next(conf, state);
++}
++
++/**
++ * textsearch_get_pattern - return head of the pattern
++ * @conf: search configuration
++ */
++static inline void *textsearch_get_pattern(struct ts_config *conf)
++{
++ return conf->ops->get_pattern(conf);
++}
++
++/**
++ * textsearch_get_pattern_len - return length of the pattern
++ * @conf: search configuration
++ */
++static inline unsigned int textsearch_get_pattern_len(struct ts_config *conf)
++{
++ return conf->ops->get_pattern_len(conf);
++}
++
++extern int textsearch_register(struct ts_ops *);
++extern int textsearch_unregister(struct ts_ops *);
++extern struct ts_config *textsearch_prepare(const char *, const void *,
++ unsigned int, gfp_t, int);
++extern void textsearch_destroy(struct ts_config *conf);
++extern unsigned int textsearch_find_continuous(struct ts_config *,
++ struct ts_state *,
++ const void *, unsigned int);
++
++
++#define TS_PRIV_ALIGNTO 8
++#define TS_PRIV_ALIGN(len) (((len) + TS_PRIV_ALIGNTO-1) & ~(TS_PRIV_ALIGNTO-1))
++
++static inline struct ts_config *alloc_ts_config(size_t payload,
++ gfp_t gfp_mask)
++{
++ struct ts_config *conf;
++
++ conf = kmalloc(TS_PRIV_ALIGN(sizeof(*conf)) + payload, gfp_mask);
++ if (conf == NULL)
++ return -ENOMEM;
++
++ memset(conf, 0, TS_PRIV_ALIGN(sizeof(*conf)) + payload);
++ return conf;
++}
++
++static inline void *ts_config_priv(struct ts_config *conf)
++{
++ return ((u8 *) conf + TS_PRIV_ALIGN(sizeof(struct ts_config)));
++}
++
++#endif /* __KERNEL__ */
++
++#endif
+diff -Nur linux-2.4.32/net/ipv4/netfilter/Config.in linux-2.4.32.patch/net/ipv4/netfilter/Config.in
+--- linux-2.4.32/net/ipv4/netfilter/Config.in 2005-01-19 15:10:13.000000000 +0100
++++ linux-2.4.32.patch/net/ipv4/netfilter/Config.in 2005-12-16 00:41:43.023755250 +0100
+@@ -42,6 +42,7 @@
fi
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
dep_tristate ' Unclean match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_UNCLEAN $CONFIG_IP_NF_IPTABLES
+ dep_tristate ' String match support (EXPERIMENTAL) ' CONFIG_IP_NF_MATCH_STRING $CONFIG_IP_NF_IPTABLES
dep_tristate ' Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES
- dep_tristate ' Layer 7 match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7 $CONFIG_IP_NF_CONNTRACK
- dep_mbool ' Layer 7 debugging output (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7_DEBUG $CONFIG_IP_NF_MATCH_LAYER7
---- linux/net/ipv4/netfilter/Makefile.org 2005-11-08 23:11:57.214378656 +0100
-+++ linux/net/ipv4/netfilter/Makefile 2005-11-08 23:11:20.980886984 +0100
-@@ -97,6 +97,7 @@
- obj-$(CONFIG_IP_NF_MATCH_CONNBYTES) += ipt_connbytes.o
- obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += ipt_conntrack.o
- obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o
-+obj-$(CONFIG_IP_NF_MATCH_STRING) += ipt_string.o
- obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
-
- obj-$(CONFIG_IP_NF_MATCH_LAYER7) += ipt_layer7.o
---- linux/net/ipv4/netfilter/ipt_string.c 1970-01-01 01:00:00.000000000 +0100
-+++ linux/net/ipv4/netfilter/ipt_string.c 2005-11-08 23:08:51.531606728 +0100
-@@ -0,0 +1,218 @@
-+/* Kernel module to match a string into a packet.
-+ *
-+ * Copyright (C) 2000 Emmanuel Roger <winfield@freegates.be>
+ fi
+ # The targets
+diff -Nur linux-2.4.32/net/ipv4/netfilter/ipt_string.c linux-2.4.32.patch/net/ipv4/netfilter/ipt_string.c
+--- linux-2.4.32/net/ipv4/netfilter/ipt_string.c 1970-01-01 01:00:00.000000000 +0100
++++ linux-2.4.32.patch/net/ipv4/netfilter/ipt_string.c 2005-12-16 00:40:48.436343750 +0100
+@@ -0,0 +1,91 @@
++/* String matching match for iptables
+ *
-+ * ChangeLog
-+ * 19.02.2002: Gianni Tedesco <gianni@ecsc.co.uk>
-+ * Fixed SMP re-entrancy problem using per-cpu data areas
-+ * for the skip/shift tables.
-+ * 02.05.2001: Gianni Tedesco <gianni@ecsc.co.uk>
-+ * Fixed kernel panic, due to overrunning boyer moore string
-+ * tables. Also slightly tweaked heuristic for deciding what
-+ * search algo to use.
-+ * 27.01.2001: Gianni Tedesco <gianni@ecsc.co.uk>
-+ * Implemented Boyer Moore Sublinear search algorithm
-+ * alongside the existing linear search based on memcmp().
-+ * Also a quick check to decide which method to use on a per
-+ * packet basis.
++ * (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/smp.h>
++#include <linux/init.h>
+#include <linux/module.h>
++#include <linux/kernel.h>
+#include <linux/skbuff.h>
-+#include <linux/file.h>
-+#include <net/sock.h>
-+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_string.h>
++#include <linux/textsearch.h>
+
++MODULE_AUTHOR("Pablo Neira Ayuso <pablo@eurodev.net>");
++MODULE_DESCRIPTION("IP tables string match module");
+MODULE_LICENSE("GPL");
+
-+struct string_per_cpu {
-+ int *skip;
-+ int *shift;
-+ int *len;
-+};
++static int match(const struct sk_buff *skb,
++ const struct net_device *in,
++ const struct net_device *out,
++ const void *matchinfo,
++ int offset,
++ int *hotdrop)
++{
++ struct ts_state state;
++ struct ipt_string_info *conf = (struct ipt_string_info *) matchinfo;
+
-+struct string_per_cpu *bm_string_data=NULL;
++ memset(&state, 0, sizeof(struct ts_state));
+
-+/* Boyer Moore Sublinear string search - VERY FAST */
-+char *search_sublinear (char *needle, char *haystack, int needle_len, int haystack_len)
-+{
-+ int M1, right_end, sk, sh;
-+ int ended, j, i;
-+
-+ int *skip, *shift, *len;
-+
-+ /* use data suitable for this CPU */
-+ shift=bm_string_data[smp_processor_id()].shift;
-+ skip=bm_string_data[smp_processor_id()].skip;
-+ len=bm_string_data[smp_processor_id()].len;
-+
-+ /* Setup skip/shift tables */
-+ M1 = right_end = needle_len-1;
-+ for (i = 0; i < BM_MAX_HLEN; i++) skip[i] = needle_len;
-+ for (i = 0; needle[i]; i++) skip[needle[i]] = M1 - i;
-+
-+ for (i = 1; i < needle_len; i++) {
-+ for (j = 0; j < needle_len && needle[M1 - j] == needle[M1 - i - j]; j++);
-+ len[i] = j;
-+ }
-+
-+ shift[0] = 1;
-+ for (i = 1; i < needle_len; i++) shift[i] = needle_len;
-+ for (i = M1; i > 0; i--) shift[len[i]] = i;
-+ ended = 0;
-+
-+ for (i = 0; i < needle_len; i++) {
-+ if (len[i] == M1 - i) ended = i;
-+ if (ended) shift[i] = ended;
-+ }
-+
-+ /* Do the search*/
-+ while (right_end < haystack_len)
-+ {
-+ for (i = 0; i < needle_len && haystack[right_end - i] == needle[M1 - i]; i++);
-+ if (i == needle_len) {
-+ return haystack+(right_end - M1);
-+ }
-+
-+ sk = skip[haystack[right_end - i]];
-+ sh = shift[i];
-+ right_end = max(right_end - i + sk, right_end + sh);
-+ }
-+
-+ return NULL;
-+}
-+
-+/* Linear string search based on memcmp() */
-+char *search_linear (char *needle, char *haystack, int needle_len, int haystack_len)
-+{
-+ char *k = haystack + (haystack_len-needle_len);
-+ char *t = haystack;
-+
-+ while ( t <= k ) {
-+ if (memcmp(t, needle, needle_len) == 0)
-+ return t;
-+ t++;
-+ }
-+
-+ return NULL;
++ return (skb_find_text((struct sk_buff *)skb, conf->from_offset,
++ conf->to_offset, conf->config, &state)
++ != UINT_MAX) && !conf->invert;
+}
+
++#define STRING_TEXT_PRIV(m) ((struct ipt_string_info *) m)
+
-+static int
-+match(const struct sk_buff *skb,
-+ const struct net_device *in,
-+ const struct net_device *out,
-+ const void *matchinfo,
-+ int offset,
-+ const void *hdr,
-+ u_int16_t datalen,
-+ int *hotdrop)
++static int checkentry(const char *tablename,
++ const struct ipt_ip *ip,
++ void *matchinfo,
++ unsigned int matchsize,
++ unsigned int hook_mask)
+{
-+ const struct ipt_string_info *info = matchinfo;
-+ struct iphdr *ip = skb->nh.iph;
-+ int hlen, nlen;
-+ char *needle, *haystack;
-+ proc_ipt_search search=search_linear;
-+
-+ if ( !ip ) return 0;
-+
-+ /* get lenghts, and validate them */
-+ nlen=info->len;
-+ hlen=ntohs(ip->tot_len)-(ip->ihl*4);
-+ if ( nlen > hlen ) return 0;
-+
-+ needle=(char *)&info->string;
-+ haystack=(char *)ip+(ip->ihl*4);
-+
-+ /* The sublinear search comes in to its own
-+ * on the larger packets */
-+ if ( (hlen>IPT_STRING_HAYSTACK_THRESH) &&
-+ (nlen>IPT_STRING_NEEDLE_THRESH) ) {
-+ if ( hlen < BM_MAX_HLEN ) {
-+ search=search_sublinear;
-+ }else{
-+ if (net_ratelimit())
-+ printk(KERN_INFO "ipt_string: Packet too big "
-+ "to attempt sublinear string search "
-+ "(%d bytes)\n", hlen );
-+ }
-+ }
-+
-+ return ((search(needle, haystack, nlen, hlen)!=NULL) ^ info->invert);
-+}
++ struct ipt_string_info *conf = matchinfo;
++ struct ts_config *ts_conf;
+
-+static int
-+checkentry(const char *tablename,
-+ const struct ipt_ip *ip,
-+ void *matchinfo,
-+ unsigned int matchsize,
-+ unsigned int hook_mask)
-+{
++ if (matchsize != IPT_ALIGN(sizeof(struct ipt_string_info)))
++ return 0;
++
++ /* Damn, can't handle this case properly with iptables... */
++ if (conf->from_offset > conf->to_offset)
++ return 0;
++
++ ts_conf = textsearch_prepare(conf->algo, conf->pattern, conf->patlen,
++ GFP_KERNEL, TS_AUTOLOAD);
++ if (IS_ERR(ts_conf))
++ return 0;
+
-+ if (matchsize != IPT_ALIGN(sizeof(struct ipt_string_info)))
-+ return 0;
++ conf->config = ts_conf;
+
-+ return 1;
++ return 1;
+}
+
-+void string_freeup_data(void)
++static void destroy(void *matchinfo, unsigned int matchsize)
+{
-+ int c;
-+
-+ if ( bm_string_data ) {
-+ for(c=0; c<smp_num_cpus; c++) {
-+ if ( bm_string_data[c].shift ) kfree(bm_string_data[c].shift);
-+ if ( bm_string_data[c].skip ) kfree(bm_string_data[c].skip);
-+ if ( bm_string_data[c].len ) kfree(bm_string_data[c].len);
-+ }
-+ kfree(bm_string_data);
-+ }
++ textsearch_destroy(STRING_TEXT_PRIV(matchinfo)->config);
+}
+
-+static struct ipt_match string_match
-+= { { NULL, NULL }, "string", &match, &checkentry, NULL, THIS_MODULE };
++static struct ipt_match string_match = {
++ .name = "string",
++ .match = match,
++ .checkentry = checkentry,
++ .destroy = destroy,
++ .me = THIS_MODULE
++};
+
+static int __init init(void)
+{
-+ int c;
-+ size_t tlen;
-+ size_t alen;
-+
-+ tlen=sizeof(struct string_per_cpu)*smp_num_cpus;
-+ alen=sizeof(int)*BM_MAX_HLEN;
-+
-+ /* allocate array of structures */
-+ if ( !(bm_string_data=kmalloc(tlen,GFP_KERNEL)) ) {
-+ return 0;
-+ }
-+
-+ memset(bm_string_data, 0, tlen);
-+
-+ /* allocate our skip/shift tables */
-+ for(c=0; c<smp_num_cpus; c++) {
-+ if ( !(bm_string_data[c].shift=kmalloc(alen, GFP_KERNEL)) )
-+ goto alloc_fail;
-+ if ( !(bm_string_data[c].skip=kmalloc(alen, GFP_KERNEL)) )
-+ goto alloc_fail;
-+ if ( !(bm_string_data[c].len=kmalloc(alen, GFP_KERNEL)) )
-+ goto alloc_fail;
-+ }
-+
+ return ipt_register_match(&string_match);
-+
-+alloc_fail:
-+ string_freeup_data();
-+ return 0;
+}
+
+static void __exit fini(void)
+{
+ ipt_unregister_match(&string_match);
-+ string_freeup_data();
+}
+
+module_init(init);
+module_exit(fini);
---- linux/include/linux/netfilter_ipv4/ipt_string.h 1970-01-01 01:00:00.000000000 +0100
-+++ linux/include/linux/netfilter_ipv4/ipt_string.h 2005-11-08 23:09:45.219444936 +0100
-@@ -0,0 +1,21 @@
-+#ifndef _IPT_STRING_H
-+#define _IPT_STRING_H
-+
-+/* *** PERFORMANCE TWEAK ***
-+ * Packet size and search string threshold,
-+ * above which sublinear searches is used. */
-+#define IPT_STRING_HAYSTACK_THRESH 100
-+#define IPT_STRING_NEEDLE_THRESH 20
-+
-+#define BM_MAX_NLEN 256
-+#define BM_MAX_HLEN 1024
-+
-+typedef char *(*proc_ipt_search) (char *, char *, int, int);
-+
-+struct ipt_string_info {
-+ char string[BM_MAX_NLEN];
-+ u_int16_t invert;
-+ u_int16_t len;
-+};
-+
-+#endif /* _IPT_STRING_H */
+diff -Nur linux-2.4.32/net/ipv4/netfilter/Makefile linux-2.4.32.patch/net/ipv4/netfilter/Makefile
+--- linux-2.4.32/net/ipv4/netfilter/Makefile 2003-08-25 13:44:44.000000000 +0200
++++ linux-2.4.32.patch/net/ipv4/netfilter/Makefile 2005-12-16 00:42:10.929499250 +0100
+@@ -85,6 +85,7 @@
+ obj-$(CONFIG_IP_NF_MATCH_STATE) += ipt_state.o
+ obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += ipt_conntrack.o
+ obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o
++obj-$(CONFIG_IP_NF_MATCH_STRING) += ipt_string.o
+ obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
+
+ # targets
projects / openwrt.git / commitdiff