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fix one of the iptables 1.3.4 compile errors on 2.4, backport of ipt_string from 2.6, need runtime testing

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git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@2699 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
wbx 2005-12-16 13:38:40 +00:00
parent 5a4c6e5f7d
commit a8b38a53a7
1 changed files with 319 additions and 236 deletions
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553
target/linux/linux-2.4/patches/generic/609-netfilter_string.patch
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@ -1,265 +1,348 @@
--- 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.
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
+ *
+ * Copyright (C) 2000 Emmanuel Roger <winfield@freegates.be>
+ * (C) 2005 Pablo Neira Ayuso <pablo@eurodev.net>
+ *
+ * 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.
+ * 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;
+
+ memset(&state, 0, sizeof(struct ts_state));
+
+ 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 checkentry(const char *tablename,
+ const struct ipt_ip *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ struct ipt_string_info *conf = matchinfo;
+ struct ts_config *ts_conf;
+
+ 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;
+
+ conf->config = ts_conf;
+
+ return 1;
+}
+
+static void destroy(void *matchinfo, unsigned int matchsize)
+{
+ textsearch_destroy(STRING_TEXT_PRIV(matchinfo)->config);
+}
+
+static struct ipt_match string_match = {
+ .name = "string",
+ .match = match,
+ .checkentry = checkentry,
+ .destroy = destroy,
+ .me = THIS_MODULE
+};
+
+struct string_per_cpu *bm_string_data=NULL;
+
+/* 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;
+}
+
+
+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)
+{
+ 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);
+}
+
+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;
+
+ return 1;
+}
+
+void string_freeup_data(void)
+{
+ 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);
+ }
+}
+
+static struct ipt_match string_match
+= { { NULL, NULL }, "string", &match, &checkentry, NULL, 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