Make L7-filter compile with kernel 2.6.27 (#4253)

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
---



git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13400 3c298f89-4303-0410-b956-a3cf2f4a3e73

2 files changed, 770 insertions, 722 deletions

diff --git a/target/linux/generic-2.6/patches-2.6.27/100-netfilter_layer7_2.17.patch b/target/linux/generic-2.6/patches-2.6.27/100-netfilter_layer7_2.17.patch
index 26b04e51ca..8da0d1e7b3 100644
--- a/target/linux/generic-2.6/patches-2.6.27/100-netfilter_layer7_2.17.patch
+++ b/target/linux/generic-2.6/patches-2.6.27/100-netfilter_layer7_2.17.patch
@@ -1,6 +1,54 @@
+diff --git a/include/linux/netfilter/xt_layer7.h b/include/linux/netfilter/xt_layer7.h
+new file mode 100644
+index 0000000..147cd64
+--- /dev/null
++++ b/include/linux/netfilter/xt_layer7.h
+@@ -0,0 +1,13 @@
++#ifndef _XT_LAYER7_H
++#define _XT_LAYER7_H
++
++#define MAX_PATTERN_LEN 8192
++#define MAX_PROTOCOL_LEN 256
++
++struct xt_layer7_info {
++    char protocol[MAX_PROTOCOL_LEN];
++    char pattern[MAX_PATTERN_LEN];
++    u_int8_t invert;
++};
++
++#endif /* _XT_LAYER7_H */
+diff --git a/include/net/netfilter/nf_conntrack.h b/include/net/netfilter/nf_conntrack.h
+index b76a868..2a0bb9b 100644
+--- a/include/net/netfilter/nf_conntrack.h
++++ b/include/net/netfilter/nf_conntrack.h
+@@ -118,6 +118,22 @@ struct nf_conn
+ 	u_int32_t secmark;
+ #endif
+ 
++#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || \
++    defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
++	struct {
++		/*
++		 * e.g. "http". NULL before decision. "unknown" after decision
++		 * if no match.
++		 */
++		char *app_proto;
++		/*
++		 * application layer data so far. NULL after match decision.
++		 */
++		char *app_data;
++		unsigned int app_data_len;
++	} layer7;
++#endif
++
+ 	/* Storage reserved for other modules: */
+ 	union nf_conntrack_proto proto;
+ 
+diff --git a/net/netfilter/Kconfig b/net/netfilter/Kconfig
+index 25dcef9..29fe15d 100644
 --- a/net/netfilter/Kconfig
 +++ b/net/netfilter/Kconfig
-@@ -757,6 +757,27 @@ config NETFILTER_XT_MATCH_STATE
+@@ -795,6 +795,27 @@ config NETFILTER_XT_MATCH_STATE
  
  	  To compile it as a module, choose M here.  If unsure, say N.
  
@@ -27,654 +75,58 @@
 +
  config NETFILTER_XT_MATCH_STATISTIC
  	tristate '"statistic" match support'
- 	depends on NETFILTER_XTABLES
+ 	depends on NETFILTER_ADVANCED
+diff --git a/net/netfilter/Makefile b/net/netfilter/Makefile
+index da3d909..c15b75d 100644
 --- a/net/netfilter/Makefile
 +++ b/net/netfilter/Makefile
-@@ -78,6 +78,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_RATEEST)
- obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o
+@@ -84,6 +84,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_RECENT) += xt_recent.o
  obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o
+ obj-$(CONFIG_NETFILTER_XT_MATCH_SOCKET) += xt_socket.o
  obj-$(CONFIG_NETFILTER_XT_MATCH_STATE) += xt_state.o
 +obj-$(CONFIG_NETFILTER_XT_MATCH_LAYER7) += xt_layer7.o
  obj-$(CONFIG_NETFILTER_XT_MATCH_STATISTIC) += xt_statistic.o
  obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) += xt_string.o
  obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o
---- /dev/null
-+++ b/net/netfilter/xt_layer7.c
-@@ -0,0 +1,634 @@
-+/*
-+  Kernel module to match application layer (OSI layer 7) data in connections.
-+
-+  http://l7-filter.sf.net
-+
-+  (C) 2003, 2004, 2005, 2006, 2007 Matthew Strait and Ethan Sommer.
-+
-+  This program is free software; you can redistribute it and/or
-+  modify it under the terms of the GNU General Public License
-+  as published by the Free Software Foundation; either version
-+  2 of the License, or (at your option) any later version.
-+  http://www.gnu.org/licenses/gpl.txt
-+
-+  Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>,
-+  xt_helper.c (C) 2002 Harald Welte and cls_layer7.c (C) 2003 Matthew Strait,
-+  Ethan Sommer, Justin Levandoski.
-+*/
-+
-+#include <linux/spinlock.h>
-+#include <linux/version.h>
-+#include <net/ip.h>
-+#include <net/tcp.h>
-+#include <linux/module.h>
-+#include <linux/skbuff.h>
-+#include <linux/netfilter.h>
-+#include <net/netfilter/nf_conntrack.h>
-+#include <net/netfilter/nf_conntrack_core.h>
-+#include <linux/netfilter/x_tables.h>
-+#include <linux/netfilter/xt_layer7.h>
-+#include <linux/ctype.h>
-+#include <linux/proc_fs.h>
-+
-+#include "regexp/regexp.c"
-+
-+MODULE_LICENSE("GPL");
-+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>");
-+MODULE_DESCRIPTION("iptables application layer match module");
-+MODULE_ALIAS("ipt_layer7");
-+MODULE_VERSION("2.17");
-+
-+static int maxdatalen = 2048; // this is the default
-+module_param(maxdatalen, int, 0444);
-+MODULE_PARM_DESC(maxdatalen, "maximum bytes of data looked at by l7-filter");
-+#ifdef CONFIG_NETFILTER_XT_MATCH_LAYER7_DEBUG
-+	#define DPRINTK(format,args...) printk(format,##args)
-+#else
-+	#define DPRINTK(format,args...)
-+#endif
-+
-+#define TOTAL_PACKETS master_conntrack->counters[IP_CT_DIR_ORIGINAL].packets + \
-+		      master_conntrack->counters[IP_CT_DIR_REPLY].packets
-+
-+/* Number of packets whose data we look at.
-+This can be modified through /proc/net/layer7_numpackets */
-+static int num_packets = 10;
-+
-+static struct pattern_cache {
-+	char * regex_string;
-+	regexp * pattern;
-+	struct pattern_cache * next;
-+} * first_pattern_cache = NULL;
-+
-+DEFINE_SPINLOCK(l7_lock);
-+
-+#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG
-+/* Converts an unfriendly string into a friendly one by
-+replacing unprintables with periods and all whitespace with " ". */
-+static char * friendly_print(unsigned char * s)
-+{
-+	char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC);
-+	int i;
-+
-+	if(!f) {
-+		if (net_ratelimit())
-+			printk(KERN_ERR "layer7: out of memory in "
-+					"friendly_print, bailing.\n");
-+		return NULL;
-+	}
-+
-+	for(i = 0; i < strlen(s); i++){
-+		if(isprint(s[i]) && s[i] < 128)	f[i] = s[i];
-+		else if(isspace(s[i]))		f[i] = ' ';
-+		else 				f[i] = '.';
-+	}
-+	f[i] = '\0';
-+	return f;
-+}
-+
-+static char dec2hex(int i)
-+{
-+	switch (i) {
-+		case 0 ... 9:
-+			return (i + '0');
-+			break;
-+		case 10 ... 15:
-+			return (i - 10 + 'a');
-+			break;
-+		default:
-+			if (net_ratelimit())
-+				printk("layer7: Problem in dec2hex\n");
-+			return '\0';
-+	}
-+}
-+
-+static char * hex_print(unsigned char * s)
-+{
-+	char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC);
-+	int i;
-+
-+	if(!g) {
-+	       if (net_ratelimit())
-+			printk(KERN_ERR "layer7: out of memory in hex_print, "
-+					"bailing.\n");
-+	       return NULL;
-+	}
-+
-+	for(i = 0; i < strlen(s); i++) {
-+		g[i*3    ] = dec2hex(s[i]/16);
-+		g[i*3 + 1] = dec2hex(s[i]%16);
-+		g[i*3 + 2] = ' ';
-+	}
-+	g[i*3] = '\0';
-+
-+	return g;
-+}
-+#endif // DEBUG
-+
-+/* Use instead of regcomp.  As we expect to be seeing the same regexps over and
-+over again, it make sense to cache the results. */
-+static regexp * compile_and_cache(const char * regex_string,
-+                                  const char * protocol)
-+{
-+	struct pattern_cache * node               = first_pattern_cache;
-+	struct pattern_cache * last_pattern_cache = first_pattern_cache;
-+	struct pattern_cache * tmp;
-+	unsigned int len;
-+
-+	while (node != NULL) {
-+		if (!strcmp(node->regex_string, regex_string))
-+		return node->pattern;
-+
-+		last_pattern_cache = node;/* points at the last non-NULL node */
-+		node = node->next;
-+	}
-+
-+	/* If we reach the end of the list, then we have not yet cached
-+	   the pattern for this regex. Let's do that now.
-+	   Be paranoid about running out of memory to avoid list corruption. */
-+	tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC);
-+
-+	if(!tmp) {
-+		if (net_ratelimit())
-+			printk(KERN_ERR "layer7: out of memory in "
-+					"compile_and_cache, bailing.\n");
-+		return NULL;
-+	}
-+
-+	tmp->regex_string  = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC);
-+	tmp->pattern       = kmalloc(sizeof(struct regexp),    GFP_ATOMIC);
-+	tmp->next = NULL;
-+
-+	if(!tmp->regex_string || !tmp->pattern) {
-+		if (net_ratelimit())
-+			printk(KERN_ERR "layer7: out of memory in "
-+					"compile_and_cache, bailing.\n");
-+		kfree(tmp->regex_string);
-+		kfree(tmp->pattern);
-+		kfree(tmp);
-+		return NULL;
-+	}
-+
-+	/* Ok.  The new node is all ready now. */
-+	node = tmp;
-+
-+	if(first_pattern_cache == NULL) /* list is empty */
-+		first_pattern_cache = node; /* make node the beginning */
-+	else
-+		last_pattern_cache->next = node; /* attach node to the end */
-+
-+	/* copy the string and compile the regex */
-+	len = strlen(regex_string);
-+	DPRINTK("About to compile this: \"%s\"\n", regex_string);
-+	node->pattern = regcomp((char *)regex_string, &len);
-+	if ( !node->pattern ) {
-+		if (net_ratelimit())
-+			printk(KERN_ERR "layer7: Error compiling regexp "
-+					"\"%s\" (%s)\n",
-+					regex_string, protocol);
-+		/* pattern is now cached as NULL, so we won't try again. */
-+	}
-+
-+	strcpy(node->regex_string, regex_string);
-+	return node->pattern;
-+}
-+
-+static int can_handle(const struct sk_buff *skb)
-+{
-+	if(!ip_hdr(skb)) /* not IP */
-+		return 0;
-+	if(ip_hdr(skb)->protocol != IPPROTO_TCP &&
-+	   ip_hdr(skb)->protocol != IPPROTO_UDP &&
-+	   ip_hdr(skb)->protocol != IPPROTO_ICMP)
-+		return 0;
-+	return 1;
-+}
-+
-+/* Returns offset the into the skb->data that the application data starts */
-+static int app_data_offset(const struct sk_buff *skb)
-+{
-+	/* In case we are ported somewhere (ebtables?) where ip_hdr(skb)
-+	isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */
-+	int ip_hl = 4*ip_hdr(skb)->ihl;
-+
-+	if( ip_hdr(skb)->protocol == IPPROTO_TCP ) {
-+		/* 12 == offset into TCP header for the header length field.
-+		Can't get this with skb->h.th->doff because the tcphdr
-+		struct doesn't get set when routing (this is confirmed to be
-+		true in Netfilter as well as QoS.) */
-+		int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4);
-+
-+		return ip_hl + tcp_hl;
-+	} else if( ip_hdr(skb)->protocol == IPPROTO_UDP  ) {
-+		return ip_hl + 8; /* UDP header is always 8 bytes */
-+	} else if( ip_hdr(skb)->protocol == IPPROTO_ICMP ) {
-+		return ip_hl + 8; /* ICMP header is 8 bytes */
-+	} else {
-+		if (net_ratelimit())
-+			printk(KERN_ERR "layer7: tried to handle unknown "
-+					"protocol!\n");
-+		return ip_hl + 8; /* something reasonable */
-+	}
-+}
-+
-+/* handles whether there's a match when we aren't appending data anymore */
-+static int match_no_append(struct nf_conn * conntrack,
-+                           struct nf_conn * master_conntrack,
-+                           enum ip_conntrack_info ctinfo,
-+                           enum ip_conntrack_info master_ctinfo,
-+                           const struct xt_layer7_info * info)
-+{
-+	/* If we're in here, throw the app data away */
-+	if(master_conntrack->layer7.app_data != NULL) {
-+
-+	#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG
-+		if(!master_conntrack->layer7.app_proto) {
-+			char * f =
-+			  friendly_print(master_conntrack->layer7.app_data);
-+			char * g =
-+			  hex_print(master_conntrack->layer7.app_data);
-+			DPRINTK("\nl7-filter gave up after %d bytes "
-+				"(%d packets):\n%s\n",
-+				strlen(f), TOTAL_PACKETS, f);
-+			kfree(f);
-+			DPRINTK("In hex: %s\n", g);
-+			kfree(g);
-+		}
+diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c
+index 622d7c6..32959cc 100644
+--- a/net/netfilter/nf_conntrack_core.c
++++ b/net/netfilter/nf_conntrack_core.c
+@@ -201,6 +201,14 @@ destroy_conntrack(struct nf_conntrack *nfct)
+ 	 * too. */
+ 	nf_ct_remove_expectations(ct);
+ 
++	#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
++	if(ct->layer7.app_proto)
++		kfree(ct->layer7.app_proto);
++	if(ct->layer7.app_data)
++	kfree(ct->layer7.app_data);
 +	#endif
 +
-+		kfree(master_conntrack->layer7.app_data);
-+		master_conntrack->layer7.app_data = NULL; /* don't free again */
-+	}
 +
-+	if(master_conntrack->layer7.app_proto){
-+		/* Here child connections set their .app_proto (for /proc) */
-+		if(!conntrack->layer7.app_proto) {
-+			conntrack->layer7.app_proto =
-+			  kmalloc(strlen(master_conntrack->layer7.app_proto)+1,
-+			    GFP_ATOMIC);
-+			if(!conntrack->layer7.app_proto){
-+				if (net_ratelimit())
-+					printk(KERN_ERR "layer7: out of memory "
-+							"in match_no_append, "
-+							"bailing.\n");
-+				return 1;
-+			}
-+			strcpy(conntrack->layer7.app_proto,
-+				master_conntrack->layer7.app_proto);
-+		}
-+
-+		return (!strcmp(master_conntrack->layer7.app_proto,
-+				info->protocol));
-+	}
-+	else {
-+		/* If not classified, set to "unknown" to distinguish from
-+		connections that are still being tested. */
-+		master_conntrack->layer7.app_proto =
-+			kmalloc(strlen("unknown")+1, GFP_ATOMIC);
-+		if(!master_conntrack->layer7.app_proto){
-+			if (net_ratelimit())
-+				printk(KERN_ERR "layer7: out of memory in "
-+						"match_no_append, bailing.\n");
-+			return 1;
-+		}
-+		strcpy(master_conntrack->layer7.app_proto, "unknown");
-+		return 0;
-+	}
-+}
-+
-+/* add the new app data to the conntrack.  Return number of bytes added. */
-+static int add_data(struct nf_conn * master_conntrack,
-+                    char * app_data, int appdatalen)
-+{
-+	int length = 0, i;
-+	int oldlength = master_conntrack->layer7.app_data_len;
-+
-+	/* This is a fix for a race condition by Deti Fliegl. However, I'm not
-+	   clear on whether the race condition exists or whether this really
-+	   fixes it.  I might just be being dense... Anyway, if it's not really
-+	   a fix, all it does is waste a very small amount of time. */
-+	if(!master_conntrack->layer7.app_data) return 0;
-+
-+	/* Strip nulls. Make everything lower case (our regex lib doesn't
-+	do case insensitivity).  Add it to the end of the current data. */
-+	for(i = 0; i < maxdatalen-oldlength-1 &&
-+		   i < appdatalen; i++) {
-+		if(app_data[i] != '\0') {
-+			/* the kernel version of tolower mungs 'upper ascii' */
-+			master_conntrack->layer7.app_data[length+oldlength] =
-+				isascii(app_data[i])?
-+					tolower(app_data[i]) : app_data[i];
-+			length++;
-+		}
-+	}
-+
-+	master_conntrack->layer7.app_data[length+oldlength] = '\0';
-+	master_conntrack->layer7.app_data_len = length + oldlength;
-+
-+	return length;
-+}
-+
-+/* taken from drivers/video/modedb.c */
-+static int my_atoi(const char *s)
-+{
-+	int val = 0;
-+
-+	for (;; s++) {
-+		switch (*s) {
-+			case '0'...'9':
-+			val = 10*val+(*s-'0');
-+			break;
-+		default:
-+			return val;
-+		}
-+	}
-+}
-+
-+/* write out num_packets to userland. */
-+static int layer7_read_proc(char* page, char ** start, off_t off, int count,
-+                            int* eof, void * data)
-+{
-+	if(num_packets > 99 && net_ratelimit())
-+		printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n");
-+
-+	page[0] = num_packets/10 + '0';
-+	page[1] = num_packets%10 + '0';
-+	page[2] = '\n';
-+	page[3] = '\0';
-+
-+	*eof=1;
-+
-+	return 3;
-+}
-+
-+/* Read in num_packets from userland */
-+static int layer7_write_proc(struct file* file, const char* buffer,
-+                             unsigned long count, void *data)
-+{
-+	char * foo = kmalloc(count, GFP_ATOMIC);
-+
-+	if(!foo){
-+		if (net_ratelimit())
-+			printk(KERN_ERR "layer7: out of memory, bailing. "
-+					"num_packets unchanged.\n");
-+		return count;
-+	}
-+
-+	if(copy_from_user(foo, buffer, count)) {
-+		return -EFAULT;
-+	}
-+
-+
-+	num_packets = my_atoi(foo);
-+	kfree (foo);
-+
-+	/* This has an arbitrary limit to make the math easier. I'm lazy.
-+	But anyway, 99 is a LOT! If you want more, you're doing it wrong! */
-+	if(num_packets > 99) {
-+		printk(KERN_WARNING "layer7: num_packets can't be > 99.\n");
-+		num_packets = 99;
-+	} else if(num_packets < 1) {
-+		printk(KERN_WARNING "layer7: num_packets can't be < 1.\n");
-+		num_packets = 1;
-+	}
-+
-+	return count;
-+}
-+
-+static bool
-+match(const struct sk_buff *skbin,
-+      const struct net_device *in,
-+      const struct net_device *out,
-+      const struct xt_match *match,
-+      const void *matchinfo,
-+      int offset,
-+      unsigned int protoff,
-+      bool *hotdrop)
-+{
-+	/* sidestep const without getting a compiler warning... */
-+	struct sk_buff * skb = (struct sk_buff *)skbin;
-+
-+	const struct xt_layer7_info * info = matchinfo;
-+	enum ip_conntrack_info master_ctinfo, ctinfo;
-+	struct nf_conn *master_conntrack, *conntrack;
-+	unsigned char * app_data;
-+	unsigned int pattern_result, appdatalen;
-+	regexp * comppattern;
-+
-+	/* Be paranoid/incompetent - lock the entire match function. */
-+	spin_lock_bh(&l7_lock);
-+
-+	if(!can_handle(skb)){
-+		DPRINTK("layer7: This is some protocol I can't handle.\n");
-+		spin_unlock_bh(&l7_lock);
-+		return info->invert;
-+	}
-+
-+	/* Treat parent & all its children together as one connection, except
-+	for the purpose of setting conntrack->layer7.app_proto in the actual
-+	connection. This makes /proc/net/ip_conntrack more satisfying. */
-+	if(!(conntrack = nf_ct_get(skb, &ctinfo)) ||
-+	   !(master_conntrack=nf_ct_get(skb,&master_ctinfo))){
-+		DPRINTK("layer7: couldn't get conntrack.\n");
-+		spin_unlock_bh(&l7_lock);
-+		return info->invert;
-+	}
-+
-+	/* Try to get a master conntrack (and its master etc) for FTP, etc. */
-+	while (master_ct(master_conntrack) != NULL)
-+		master_conntrack = master_ct(master_conntrack);
-+
-+	/* if we've classified it or seen too many packets */
-+	if(TOTAL_PACKETS > num_packets ||
-+	   master_conntrack->layer7.app_proto) {
-+
-+		pattern_result = match_no_append(conntrack, master_conntrack,
-+						 ctinfo, master_ctinfo, info);
-+
-+		/* skb->cb[0] == seen. Don't do things twice if there are
-+		multiple l7 rules. I'm not sure that using cb for this purpose
-+		is correct, even though it says "put your private variables
-+		there". But it doesn't look like it is being used for anything
-+		else in the skbs that make it here. */
-+		skb->cb[0] = 1; /* marking it seen here's probably irrelevant */
-+
-+		spin_unlock_bh(&l7_lock);
-+		return (pattern_result ^ info->invert);
-+	}
-+
-+	if(skb_is_nonlinear(skb)){
-+		if(skb_linearize(skb) != 0){
-+			if (net_ratelimit())
-+				printk(KERN_ERR "layer7: failed to linearize "
-+						"packet, bailing.\n");
-+			spin_unlock_bh(&l7_lock);
-+			return info->invert;
-+		}
-+	}
-+
-+	/* now that the skb is linearized, it's safe to set these. */
-+	app_data = skb->data + app_data_offset(skb);
-+	appdatalen = skb_tail_pointer(skb) - app_data;
-+
-+	/* the return value gets checked later, when we're ready to use it */
-+	comppattern = compile_and_cache(info->pattern, info->protocol);
-+
-+	/* On the first packet of a connection, allocate space for app data */
-+	if(TOTAL_PACKETS == 1 && !skb->cb[0] &&
-+	   !master_conntrack->layer7.app_data){
-+		master_conntrack->layer7.app_data =
-+			kmalloc(maxdatalen, GFP_ATOMIC);
-+		if(!master_conntrack->layer7.app_data){
-+			if (net_ratelimit())
-+				printk(KERN_ERR "layer7: out of memory in "
-+						"match, bailing.\n");
-+			spin_unlock_bh(&l7_lock);
-+			return info->invert;
-+		}
-+
-+		master_conntrack->layer7.app_data[0] = '\0';
-+	}
-+
-+	/* Can be here, but unallocated, if numpackets is increased near
-+	the beginning of a connection */
-+	if(master_conntrack->layer7.app_data == NULL){
-+		spin_unlock_bh(&l7_lock);
-+		return (info->invert); /* unmatched */
-+	}
-+
-+	if(!skb->cb[0]){
-+		int newbytes;
-+		newbytes = add_data(master_conntrack, app_data, appdatalen);
-+
-+		if(newbytes == 0) { /* didn't add any data */
-+			skb->cb[0] = 1;
-+			/* Didn't match before, not going to match now */
-+			spin_unlock_bh(&l7_lock);
-+			return info->invert;
-+		}
-+	}
-+
-+	/* If looking for "unknown", then never match.  "Unknown" means that
-+	we've given up; we're still trying with these packets. */
-+	if(!strcmp(info->protocol, "unknown")) {
-+		pattern_result = 0;
-+	/* If looking for "unset", then always match. "Unset" means that we
-+	haven't yet classified the connection. */
-+	} else if(!strcmp(info->protocol, "unset")) {
-+		pattern_result = 2;
-+		DPRINTK("layer7: matched unset: not yet classified "
-+			"(%d/%d packets)\n", TOTAL_PACKETS, num_packets);
-+	/* If the regexp failed to compile, don't bother running it */
-+	} else if(comppattern &&
-+		  regexec(comppattern, master_conntrack->layer7.app_data)){
-+		DPRINTK("layer7: matched %s\n", info->protocol);
-+		pattern_result = 1;
-+	} else pattern_result = 0;
-+
-+	if(pattern_result == 1) {
-+		master_conntrack->layer7.app_proto =
-+			kmalloc(strlen(info->protocol)+1, GFP_ATOMIC);
-+		if(!master_conntrack->layer7.app_proto){
-+			if (net_ratelimit())
-+				printk(KERN_ERR "layer7: out of memory in "
-+						"match, bailing.\n");
-+			spin_unlock_bh(&l7_lock);
-+			return (pattern_result ^ info->invert);
-+		}
-+		strcpy(master_conntrack->layer7.app_proto, info->protocol);
-+	} else if(pattern_result > 1) { /* cleanup from "unset" */
-+		pattern_result = 1;
-+	}
-+
-+	/* mark the packet seen */
-+	skb->cb[0] = 1;
-+
-+	spin_unlock_bh(&l7_lock);
-+	return (pattern_result ^ info->invert);
-+}
-+
-+static bool check(const char *tablename,
-+		 const void *inf,
-+		 const struct xt_match *match,
-+		 void *matchinfo,
-+		 unsigned int hook_mask)
-+
-+{
-+	// load nf_conntrack_ipv4
-+        if (nf_ct_l3proto_try_module_get(match->family) < 0) {
-+                printk(KERN_WARNING "can't load conntrack support for "
-+                                    "proto=%d\n", match->family);
-+                return false;
-+        }
-+	return true;
-+}
-+
-+static void
-+destroy(const struct xt_match *match, void *matchinfo)
-+{
-+	nf_ct_l3proto_module_put(match->family);
-+}
-+
-+static struct xt_match xt_layer7_match[] = {
-+{
-+	.name		= "layer7",
-+	.family		= AF_INET,
-+	.checkentry	= check,
-+	.match		= match,
-+	.destroy	= destroy,
-+	.matchsize	= sizeof(struct xt_layer7_info),
-+	.me		= THIS_MODULE
-+}
-+};
-+
-+static void layer7_cleanup_proc(void)
-+{
-+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-+	remove_proc_entry("layer7_numpackets", proc_net);
-+#else
-+	remove_proc_entry("layer7_numpackets", init_net.proc_net);
-+#endif
-+}
-+
-+/* register the proc file */
-+static void layer7_init_proc(void)
-+{
-+	struct proc_dir_entry* entry;
-+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
-+	entry = create_proc_entry("layer7_numpackets", 0644, proc_net);
-+#else
-+	entry = create_proc_entry("layer7_numpackets", 0644, init_net.proc_net);
+ 	/* We overload first tuple to link into unconfirmed list. */
+ 	if (!nf_ct_is_confirmed(ct)) {
+ 		BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode));
+diff --git a/net/netfilter/nf_conntrack_standalone.c b/net/netfilter/nf_conntrack_standalone.c
+index 98106d4..774acad 100644
+--- a/net/netfilter/nf_conntrack_standalone.c
++++ b/net/netfilter/nf_conntrack_standalone.c
+@@ -165,6 +165,12 @@ static int ct_seq_show(struct seq_file *s, void *v)
+ 		return -ENOSPC;
+ #endif
+ 
++#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
++	if(ct->layer7.app_proto &&
++           seq_printf(s, "l7proto=%s ", ct->layer7.app_proto))
++		return -ENOSPC;
 +#endif
-+	entry->read_proc = layer7_read_proc;
-+	entry->write_proc = layer7_write_proc;
-+}
 +
-+static int __init xt_layer7_init(void)
-+{
-+	need_conntrack();
-+
-+	layer7_init_proc();
-+	if(maxdatalen < 1) {
-+		printk(KERN_WARNING "layer7: maxdatalen can't be < 1, "
-+			"using 1\n");
-+		maxdatalen = 1;
-+	}
-+	/* This is not a hard limit.  It's just here to prevent people from
-+	bringing their slow machines to a grinding halt. */
-+	else if(maxdatalen > 65536) {
-+		printk(KERN_WARNING "layer7: maxdatalen can't be > 65536, "
-+			"using 65536\n");
-+		maxdatalen = 65536;
-+	}
-+	return xt_register_matches(xt_layer7_match,
-+				   ARRAY_SIZE(xt_layer7_match));
-+}
-+
-+static void __exit xt_layer7_fini(void)
-+{
-+	layer7_cleanup_proc();
-+	xt_unregister_matches(xt_layer7_match, ARRAY_SIZE(xt_layer7_match));
-+}
-+
-+module_init(xt_layer7_init);
-+module_exit(xt_layer7_fini);
+ 	if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
+ 		return -ENOSPC;
+ 
+diff --git a/net/netfilter/regexp/regexp.c b/net/netfilter/regexp/regexp.c
+new file mode 100644
+index 0000000..9006988
 --- /dev/null
 +++ b/net/netfilter/regexp/regexp.c
 @@ -0,0 +1,1197 @@
@@ -914,7 +366,7 @@
 +	register int len;
 +	int flags;
 +	struct match_globals g;
-+
++	
 +	/* commented out by ethan
 +	   extern char *malloc();
 +	*/
@@ -1041,7 +493,7 @@
 +	}
 +
 +	/* Make a closing node, and hook it on the end. */
-+	ender = regnode(g, (paren) ? CLOSE+parno : END);
++	ender = regnode(g, (paren) ? CLOSE+parno : END);	
 +	regtail(g, ret, ender);
 +
 +	/* Hook the tails of the branches to the closing node. */
@@ -1875,6 +1327,9 @@
 +#endif
 +
 +
+diff --git a/net/netfilter/regexp/regexp.h b/net/netfilter/regexp/regexp.h
+new file mode 100644
+index 0000000..a72eba7
 --- /dev/null
 +++ b/net/netfilter/regexp/regexp.h
 @@ -0,0 +1,41 @@
@@ -1919,6 +1374,9 @@
 +void regerror(char *s);
 +
 +#endif
+diff --git a/net/netfilter/regexp/regmagic.h b/net/netfilter/regexp/regmagic.h
+new file mode 100644
+index 0000000..5acf447
 --- /dev/null
 +++ b/net/netfilter/regexp/regmagic.h
 @@ -0,0 +1,5 @@
@@ -1927,6 +1385,9 @@
 + * number; the start node begins in the second byte.
 + */
 +#define	MAGIC	0234
+diff --git a/net/netfilter/regexp/regsub.c b/net/netfilter/regexp/regsub.c
+new file mode 100644
+index 0000000..339631f
 --- /dev/null
 +++ b/net/netfilter/regexp/regsub.c
 @@ -0,0 +1,95 @@
@@ -1986,7 +1447,7 @@
 +	register char c;
 +	register int no;
 +	register int len;
-+
++	
 +	/* Not necessary and gcc doesn't like it -MLS */
 +	/*extern char *strncpy();*/
 +
@@ -2025,77 +1486,660 @@
 +	}
 +	*dst++ = '\0';
 +}
---- a/net/netfilter/nf_conntrack_core.c
-+++ b/net/netfilter/nf_conntrack_core.c
-@@ -206,6 +206,14 @@ destroy_conntrack(struct nf_conntrack *n
- 	 * too. */
- 	nf_ct_remove_expectations(ct);
- 
-+	#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
-+	if(ct->layer7.app_proto)
-+		kfree(ct->layer7.app_proto);
-+	if(ct->layer7.app_data)
-+	kfree(ct->layer7.app_data);
-+	#endif
+diff --git a/net/netfilter/xt_layer7.c b/net/netfilter/xt_layer7.c
+new file mode 100644
+index 0000000..a9b88d3
+--- /dev/null
++++ b/net/netfilter/xt_layer7.c
+@@ -0,0 +1,651 @@
++/*
++  Kernel module to match application layer (OSI layer 7) data in connections.
 +
++  http://l7-filter.sf.net
 +
- 	/* We overload first tuple to link into unconfirmed list. */
- 	if (!nf_ct_is_confirmed(ct)) {
- 		BUG_ON(hlist_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnode));
---- a/net/netfilter/nf_conntrack_standalone.c
-+++ b/net/netfilter/nf_conntrack_standalone.c
-@@ -162,7 +162,12 @@ static int ct_seq_show(struct seq_file *
- 		return -ENOSPC;
- #endif
- 
--	if (seq_printf(s, "use=%u\n", atomic_read(&ct->ct_general.use)))
-+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
-+	if(ct->layer7.app_proto)
-+		if(seq_printf(s, "l7proto=%s ", ct->layer7.app_proto))
-+			return -ENOSPC;
++  (C) 2003, 2004, 2005, 2006, 2007 Matthew Strait and Ethan Sommer.
++
++  This program is free software; you can redistribute it and/or
++  modify it under the terms of the GNU General Public License
++  as published by the Free Software Foundation; either version
++  2 of the License, or (at your option) any later version.
++  http://www.gnu.org/licenses/gpl.txt
++
++  Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>,
++  xt_helper.c (C) 2002 Harald Welte and cls_layer7.c (C) 2003 Matthew Strait,
++  Ethan Sommer, Justin Levandoski.
++*/
++
++#include <linux/spinlock.h>
++#include <linux/version.h>
++#include <net/ip.h>
++#include <net/tcp.h>
++#include <linux/module.h>
++#include <linux/skbuff.h>
++#include <linux/netfilter.h>
++#include <net/netfilter/nf_conntrack.h>
++#include <net/netfilter/nf_conntrack_core.h>
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
++#include <net/netfilter/nf_conntrack_extend.h>
++#include <net/netfilter/nf_conntrack_acct.h>
 +#endif
-+	if (seq_printf(s, "asdfuse=%u\n", atomic_read(&ct->ct_general.use)))
- 		return -ENOSPC;
- 
- 	return 0;
---- a/include/net/netfilter/nf_conntrack.h
-+++ b/include/net/netfilter/nf_conntrack.h
-@@ -118,6 +118,22 @@ struct nf_conn
- 	u_int32_t secmark;
- #endif
- 
-+#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || \
-+    defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE)
-+	struct {
-+		/*
-+		 * e.g. "http". NULL before decision. "unknown" after decision
-+		 * if no match.
-+		 */
-+		char *app_proto;
-+		/*
-+		 * application layer data so far. NULL after match decision.
-+		 */
-+		char *app_data;
-+		unsigned int app_data_len;
-+	} layer7;
++#include <linux/netfilter/x_tables.h>
++#include <linux/netfilter/xt_layer7.h>
++#include <linux/ctype.h>
++#include <linux/proc_fs.h>
++
++#include "regexp/regexp.c"
++
++MODULE_LICENSE("GPL");
++MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>");
++MODULE_DESCRIPTION("iptables application layer match module");
++MODULE_ALIAS("ipt_layer7");
++MODULE_VERSION("2.19");
++
++static int maxdatalen = 2048; // this is the default
++module_param(maxdatalen, int, 0444);
++MODULE_PARM_DESC(maxdatalen, "maximum bytes of data looked at by l7-filter");
++#ifdef CONFIG_NETFILTER_XT_MATCH_LAYER7_DEBUG
++	#define DPRINTK(format,args...) printk(format,##args)
++#else
++	#define DPRINTK(format,args...)
 +#endif
 +
- 	/* Storage reserved for other modules: */
- 	union nf_conntrack_proto proto;
- 
---- /dev/null
-+++ b/include/linux/netfilter/xt_layer7.h
-@@ -0,0 +1,13 @@
-+#ifndef _XT_LAYER7_H
-+#define _XT_LAYER7_H
++/* Number of packets whose data we look at.
++This can be modified through /proc/net/layer7_numpackets */
++static int num_packets = 10;
 +
-+#define MAX_PATTERN_LEN 8192
-+#define MAX_PROTOCOL_LEN 256
++static struct pattern_cache {
++	char * regex_string;
++	regexp * pattern;
++	struct pattern_cache * next;
++} * first_pattern_cache = NULL;
 +
-+struct xt_layer7_info {
-+    char protocol[MAX_PROTOCOL_LEN];
-+    char pattern[MAX_PATTERN_LEN];
-+    u_int8_t invert;
++DEFINE_SPINLOCK(l7_lock);
++
++static int total_acct_packets(struct nf_conn *ct)
++{
++#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 26)
++	BUG_ON(ct == NULL);
++	return (ct->counters[IP_CT_DIR_ORIGINAL].packets + ct->counters[IP_CT_DIR_REPLY].packets);
++#else
++	struct nf_conn_counter *acct;
++
++	BUG_ON(ct == NULL);
++	acct = nf_conn_acct_find(ct);
++	if (!acct)
++		return 0;
++	return (acct[IP_CT_DIR_ORIGINAL].packets + acct[IP_CT_DIR_REPLY].packets);
++#endif
++}
++
++#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG
++/* Converts an unfriendly string into a friendly one by
++replacing unprintables with periods and all whitespace with " ". */
++static char * friendly_print(unsigned char * s)
++{
++	char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC);
++	int i;
++
++	if(!f) {
++		if (net_ratelimit())
++			printk(KERN_ERR "layer7: out of memory in "
++					"friendly_print, bailing.\n");
++		return NULL;
++	}
++
++	for(i = 0; i < strlen(s); i++){
++		if(isprint(s[i]) && s[i] < 128)	f[i] = s[i];
++		else if(isspace(s[i]))		f[i] = ' ';
++		else 				f[i] = '.';
++	}
++	f[i] = '\0';
++	return f;
++}
++
++static char dec2hex(int i)
++{
++	switch (i) {
++		case 0 ... 9:
++			return (i + '0');
++			break;
++		case 10 ... 15:
++			return (i - 10 + 'a');
++			break;
++		default:
++			if (net_ratelimit())
++				printk("layer7: Problem in dec2hex\n");
++			return '\0';
++	}
++}
++
++static char * hex_print(unsigned char * s)
++{
++	char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC);
++	int i;
++
++	if(!g) {
++	       if (net_ratelimit())
++			printk(KERN_ERR "layer7: out of memory in hex_print, "
++					"bailing.\n");
++	       return NULL;
++	}
++
++	for(i = 0; i < strlen(s); i++) {
++		g[i*3    ] = dec2hex(s[i]/16);
++		g[i*3 + 1] = dec2hex(s[i]%16);
++		g[i*3 + 2] = ' ';
++	}
++	g[i*3] = '\0';
++
++	return g;
++}
++#endif // DEBUG
++
++/* Use instead of regcomp.  As we expect to be seeing the same regexps over and
++over again, it make sense to cache the results. */
++static regexp * compile_and_cache(const char * regex_string, 
++                                  const char * protocol)
++{
++	struct pattern_cache * node               = first_pattern_cache;
++	struct pattern_cache * last_pattern_cache = first_pattern_cache;
++	struct pattern_cache * tmp;
++	unsigned int len;
++
++	while (node != NULL) {
++		if (!strcmp(node->regex_string, regex_string))
++		return node->pattern;
++
++		last_pattern_cache = node;/* points at the last non-NULL node */
++		node = node->next;
++	}
++
++	/* If we reach the end of the list, then we have not yet cached
++	   the pattern for this regex. Let's do that now.
++	   Be paranoid about running out of memory to avoid list corruption. */
++	tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC);
++
++	if(!tmp) {
++		if (net_ratelimit())
++			printk(KERN_ERR "layer7: out of memory in "
++					"compile_and_cache, bailing.\n");
++		return NULL;
++	}
++
++	tmp->regex_string  = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC);
++	tmp->pattern       = kmalloc(sizeof(struct regexp),    GFP_ATOMIC);
++	tmp->next = NULL;
++
++	if(!tmp->regex_string || !tmp->pattern) {
++		if (net_ratelimit())
++			printk(KERN_ERR "layer7: out of memory in "
++					"compile_and_cache, bailing.\n");
++		kfree(tmp->regex_string);
++		kfree(tmp->pattern);
++		kfree(tmp);
++		return NULL;
++	}
++
++	/* Ok.  The new node is all ready now. */
++	node = tmp;
++
++	if(first_pattern_cache == NULL) /* list is empty */
++		first_pattern_cache = node; /* make node the beginning */
++	else
++		last_pattern_cache->next = node; /* attach node to the end */
++
++	/* copy the string and compile the regex */
++	len = strlen(regex_string);
++	DPRINTK("About to compile this: \"%s\"\n", regex_string);
++	node->pattern = regcomp((char *)regex_string, &len);
++	if ( !node->pattern ) {
++		if (net_ratelimit())
++			printk(KERN_ERR "layer7: Error compiling regexp "
++					"\"%s\" (%s)\n", 
++					regex_string, protocol);
++		/* pattern is now cached as NULL, so we won't try again. */
++	}
++
++	strcpy(node->regex_string, regex_string);
++	return node->pattern;
++}
++
++static int can_handle(const struct sk_buff *skb)
++{
++	if(!ip_hdr(skb)) /* not IP */
++		return 0;
++	if(ip_hdr(skb)->protocol != IPPROTO_TCP &&
++	   ip_hdr(skb)->protocol != IPPROTO_UDP &&
++	   ip_hdr(skb)->protocol != IPPROTO_ICMP)
++		return 0;
++	return 1;
++}
++
++/* Returns offset the into the skb->data that the application data starts */
++static int app_data_offset(const struct sk_buff *skb)
++{
++	/* In case we are ported somewhere (ebtables?) where ip_hdr(skb)
++	isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */
++	int ip_hl = 4*ip_hdr(skb)->ihl;
++
++	if( ip_hdr(skb)->protocol == IPPROTO_TCP ) {
++		/* 12 == offset into TCP header for the header length field.
++		Can't get this with skb->h.th->doff because the tcphdr
++		struct doesn't get set when routing (this is confirmed to be
++		true in Netfilter as well as QoS.) */
++		int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4);
++
++		return ip_hl + tcp_hl;
++	} else if( ip_hdr(skb)->protocol == IPPROTO_UDP  ) {
++		return ip_hl + 8; /* UDP header is always 8 bytes */
++	} else if( ip_hdr(skb)->protocol == IPPROTO_ICMP ) {
++		return ip_hl + 8; /* ICMP header is 8 bytes */
++	} else {
++		if (net_ratelimit())
++			printk(KERN_ERR "layer7: tried to handle unknown "
++					"protocol!\n");
++		return ip_hl + 8; /* something reasonable */
++	}
++}
++
++/* handles whether there's a match when we aren't appending data anymore */
++static int match_no_append(struct nf_conn * conntrack, 
++                           struct nf_conn * master_conntrack, 
++                           enum ip_conntrack_info ctinfo,
++                           enum ip_conntrack_info master_ctinfo,
++                           const struct xt_layer7_info * info)
++{
++	/* If we're in here, throw the app data away */
++	if(master_conntrack->layer7.app_data != NULL) {
++
++	#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG
++		if(!master_conntrack->layer7.app_proto) {
++			char * f = 
++			  friendly_print(master_conntrack->layer7.app_data);
++			char * g = 
++			  hex_print(master_conntrack->layer7.app_data);
++			DPRINTK("\nl7-filter gave up after %d bytes "
++				"(%d packets):\n%s\n",
++				strlen(f), total_acct_packets(master_conntrack), f);
++			kfree(f);
++			DPRINTK("In hex: %s\n", g);
++			kfree(g);
++		}
++	#endif
++
++		kfree(master_conntrack->layer7.app_data);
++		master_conntrack->layer7.app_data = NULL; /* don't free again */
++	}
++
++	if(master_conntrack->layer7.app_proto){
++		/* Here child connections set their .app_proto (for /proc) */
++		if(!conntrack->layer7.app_proto) {
++			conntrack->layer7.app_proto = 
++			  kmalloc(strlen(master_conntrack->layer7.app_proto)+1, 
++			    GFP_ATOMIC);
++			if(!conntrack->layer7.app_proto){
++				if (net_ratelimit())
++					printk(KERN_ERR "layer7: out of memory "
++							"in match_no_append, "
++							"bailing.\n");
++				return 1;
++			}
++			strcpy(conntrack->layer7.app_proto, 
++				master_conntrack->layer7.app_proto);
++		}
++
++		return (!strcmp(master_conntrack->layer7.app_proto, 
++				info->protocol));
++	}
++	else {
++		/* If not classified, set to "unknown" to distinguish from
++		connections that are still being tested. */
++		master_conntrack->layer7.app_proto = 
++			kmalloc(strlen("unknown")+1, GFP_ATOMIC);
++		if(!master_conntrack->layer7.app_proto){
++			if (net_ratelimit())
++				printk(KERN_ERR "layer7: out of memory in "
++						"match_no_append, bailing.\n");
++			return 1;
++		}
++		strcpy(master_conntrack->layer7.app_proto, "unknown");
++		return 0;
++	}
++}
++
++/* add the new app data to the conntrack.  Return number of bytes added. */
++static int add_data(struct nf_conn * master_conntrack,
++                    char * app_data, int appdatalen)
++{
++	int length = 0, i;
++	int oldlength = master_conntrack->layer7.app_data_len;
++
++	/* This is a fix for a race condition by Deti Fliegl. However, I'm not 
++	   clear on whether the race condition exists or whether this really 
++	   fixes it.  I might just be being dense... Anyway, if it's not really 
++	   a fix, all it does is waste a very small amount of time. */
++	if(!master_conntrack->layer7.app_data) return 0;
++
++	/* Strip nulls. Make everything lower case (our regex lib doesn't
++	do case insensitivity).  Add it to the end of the current data. */
++	for(i = 0; i < maxdatalen-oldlength-1 &&
++		   i < appdatalen; i++) {
++		if(app_data[i] != '\0') {
++			/* the kernel version of tolower mungs 'upper ascii' */
++			master_conntrack->layer7.app_data[length+oldlength] =
++				isascii(app_data[i])? 
++					tolower(app_data[i]) : app_data[i];
++			length++;
++		}
++	}
++
++	master_conntrack->layer7.app_data[length+oldlength] = '\0';
++	master_conntrack->layer7.app_data_len = length + oldlength;
++
++	return length;
++}
++
++/* taken from drivers/video/modedb.c */
++static int my_atoi(const char *s)
++{
++	int val = 0;
++
++	for (;; s++) {
++		switch (*s) {
++			case '0'...'9':
++			val = 10*val+(*s-'0');
++			break;
++		default:
++			return val;
++		}
++	}
++}
++
++/* write out num_packets to userland. */
++static int layer7_read_proc(char* page, char ** start, off_t off, int count,
++                            int* eof, void * data)
++{
++	if(num_packets > 99 && net_ratelimit())
++		printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n");
++
++	page[0] = num_packets/10 + '0';
++	page[1] = num_packets%10 + '0';
++	page[2] = '\n';
++	page[3] = '\0';
++
++	*eof=1;
++
++	return 3;
++}
++
++/* Read in num_packets from userland */
++static int layer7_write_proc(struct file* file, const char* buffer,
++                             unsigned long count, void *data)
++{
++	char * foo = kmalloc(count, GFP_ATOMIC);
++
++	if(!foo){
++		if (net_ratelimit())
++			printk(KERN_ERR "layer7: out of memory, bailing. "
++					"num_packets unchanged.\n");
++		return count;
++	}
++
++	if(copy_from_user(foo, buffer, count)) {
++		return -EFAULT;
++	}
++
++
++	num_packets = my_atoi(foo);
++	kfree (foo);
++
++	/* This has an arbitrary limit to make the math easier. I'm lazy.
++	But anyway, 99 is a LOT! If you want more, you're doing it wrong! */
++	if(num_packets > 99) {
++		printk(KERN_WARNING "layer7: num_packets can't be > 99.\n");
++		num_packets = 99;
++	} else if(num_packets < 1) {
++		printk(KERN_WARNING "layer7: num_packets can't be < 1.\n");
++		num_packets = 1;
++	}
++
++	return count;
++}
++
++static bool
++match(const struct sk_buff *skbin,
++      const struct net_device *in,
++      const struct net_device *out,
++      const struct xt_match *match,
++      const void *matchinfo,
++      int offset,
++      unsigned int protoff,
++      bool *hotdrop)
++{
++	/* sidestep const without getting a compiler warning... */
++	struct sk_buff * skb = (struct sk_buff *)skbin; 
++
++	const struct xt_layer7_info * info = matchinfo;
++	enum ip_conntrack_info master_ctinfo, ctinfo;
++	struct nf_conn *master_conntrack, *conntrack;
++	unsigned char * app_data;
++	unsigned int pattern_result, appdatalen;
++	regexp * comppattern;
++
++	/* Be paranoid/incompetent - lock the entire match function. */
++	spin_lock_bh(&l7_lock);
++
++	if(!can_handle(skb)){
++		DPRINTK("layer7: This is some protocol I can't handle.\n");
++		spin_unlock_bh(&l7_lock);
++		return info->invert;
++	}
++
++	/* Treat parent & all its children together as one connection, except
++	for the purpose of setting conntrack->layer7.app_proto in the actual
++	connection. This makes /proc/net/ip_conntrack more satisfying. */
++	if(!(conntrack = nf_ct_get(skb, &ctinfo)) ||
++	   !(master_conntrack=nf_ct_get(skb,&master_ctinfo))){
++		DPRINTK("layer7: couldn't get conntrack.\n");
++		spin_unlock_bh(&l7_lock);
++		return info->invert;
++	}
++
++	/* Try to get a master conntrack (and its master etc) for FTP, etc. */
++	while (master_ct(master_conntrack) != NULL)
++		master_conntrack = master_ct(master_conntrack);
++
++	/* if we've classified it or seen too many packets */
++	if(total_acct_packets(master_conntrack) > num_packets ||
++	   master_conntrack->layer7.app_proto) {
++
++		pattern_result = match_no_append(conntrack, master_conntrack, 
++						 ctinfo, master_ctinfo, info);
++
++		/* skb->cb[0] == seen. Don't do things twice if there are 
++		multiple l7 rules. I'm not sure that using cb for this purpose 
++		is correct, even though it says "put your private variables 
++		there". But it doesn't look like it is being used for anything
++		else in the skbs that make it here. */
++		skb->cb[0] = 1; /* marking it seen here's probably irrelevant */
++
++		spin_unlock_bh(&l7_lock);
++		return (pattern_result ^ info->invert);
++	}
++
++	if(skb_is_nonlinear(skb)){
++		if(skb_linearize(skb) != 0){
++			if (net_ratelimit())
++				printk(KERN_ERR "layer7: failed to linearize "
++						"packet, bailing.\n");
++			spin_unlock_bh(&l7_lock);
++			return info->invert;
++		}
++	}
++
++	/* now that the skb is linearized, it's safe to set these. */
++	app_data = skb->data + app_data_offset(skb);
++	appdatalen = skb_tail_pointer(skb) - app_data;
++
++	/* the return value gets checked later, when we're ready to use it */
++	comppattern = compile_and_cache(info->pattern, info->protocol);
++
++	/* On the first packet of a connection, allocate space for app data */
++	if(total_acct_packets(master_conntrack) == 1 && !skb->cb[0] && 
++	   !master_conntrack->layer7.app_data){
++		master_conntrack->layer7.app_data = 
++			kmalloc(maxdatalen, GFP_ATOMIC);
++		if(!master_conntrack->layer7.app_data){
++			if (net_ratelimit())
++				printk(KERN_ERR "layer7: out of memory in "
++						"match, bailing.\n");
++			spin_unlock_bh(&l7_lock);
++			return info->invert;
++		}
++
++		master_conntrack->layer7.app_data[0] = '\0';
++	}
++
++	/* Can be here, but unallocated, if numpackets is increased near
++	the beginning of a connection */
++	if(master_conntrack->layer7.app_data == NULL){
++		spin_unlock_bh(&l7_lock);
++		return (info->invert); /* unmatched */
++	}
++
++	if(!skb->cb[0]){
++		int newbytes;
++		newbytes = add_data(master_conntrack, app_data, appdatalen);
++
++		if(newbytes == 0) { /* didn't add any data */
++			skb->cb[0] = 1;
++			/* Didn't match before, not going to match now */
++			spin_unlock_bh(&l7_lock);
++			return info->invert;
++		}
++	}
++
++	/* If looking for "unknown", then never match.  "Unknown" means that
++	we've given up; we're still trying with these packets. */
++	if(!strcmp(info->protocol, "unknown")) {
++		pattern_result = 0;
++	/* If looking for "unset", then always match. "Unset" means that we
++	haven't yet classified the connection. */
++	} else if(!strcmp(info->protocol, "unset")) {
++		pattern_result = 2;
++		DPRINTK("layer7: matched unset: not yet classified "
++			"(%d/%d packets)\n", total_acct_packets(master_conntrack), num_packets);
++	/* If the regexp failed to compile, don't bother running it */
++	} else if(comppattern && 
++		  regexec(comppattern, master_conntrack->layer7.app_data)){
++		DPRINTK("layer7: matched %s\n", info->protocol);
++		pattern_result = 1;
++	} else pattern_result = 0;
++
++	if(pattern_result == 1) {
++		master_conntrack->layer7.app_proto = 
++			kmalloc(strlen(info->protocol)+1, GFP_ATOMIC);
++		if(!master_conntrack->layer7.app_proto){
++			if (net_ratelimit())
++				printk(KERN_ERR "layer7: out of memory in "
++						"match, bailing.\n");
++			spin_unlock_bh(&l7_lock);
++			return (pattern_result ^ info->invert);
++		}
++		strcpy(master_conntrack->layer7.app_proto, info->protocol);
++	} else if(pattern_result > 1) { /* cleanup from "unset" */
++		pattern_result = 1;
++	}
++
++	/* mark the packet seen */
++	skb->cb[0] = 1;
++
++	spin_unlock_bh(&l7_lock);
++	return (pattern_result ^ info->invert);
++}
++
++static bool check(const char *tablename,
++		 const void *inf,
++		 const struct xt_match *match,
++		 void *matchinfo,
++		 unsigned int hook_mask)
++
++{
++	// load nf_conntrack_ipv4
++        if (nf_ct_l3proto_try_module_get(match->family) < 0) {
++                printk(KERN_WARNING "can't load conntrack support for "
++                                    "proto=%d\n", match->family);
++                return 0;
++        }
++	return 1;
++}
++
++static void
++destroy(const struct xt_match *match, void *matchinfo)
++{
++	nf_ct_l3proto_module_put(match->family);
++}
++
++static struct xt_match xt_layer7_match[] __read_mostly = {
++{
++	.name		= "layer7",
++	.family		= AF_INET,
++	.checkentry	= check,
++	.match		= match,
++	.destroy	= destroy,
++	.matchsize	= sizeof(struct xt_layer7_info),
++	.me		= THIS_MODULE
++}
 +};
 +
-+#endif /* _XT_LAYER7_H */
++static void layer7_cleanup_proc(void)
++{
++#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
++	remove_proc_entry("layer7_numpackets", proc_net);
++#else
++	remove_proc_entry("layer7_numpackets", init_net.proc_net);
++#endif
++}
++
++/* register the proc file */
++static void layer7_init_proc(void)
++{
++	struct proc_dir_entry* entry;
++#if LINUX_VERSION_CODE <= KERNEL_VERSION(2,6,23)
++	entry = create_proc_entry("layer7_numpackets", 0644, proc_net);
++#else
++	entry = create_proc_entry("layer7_numpackets", 0644, init_net.proc_net);
++#endif
++	entry->read_proc = layer7_read_proc;
++	entry->write_proc = layer7_write_proc;
++}
++
++static int __init xt_layer7_init(void)
++{
++	need_conntrack();
++
++	layer7_init_proc();
++	if(maxdatalen < 1) {
++		printk(KERN_WARNING "layer7: maxdatalen can't be < 1, "
++			"using 1\n");
++		maxdatalen = 1;
++	}
++	/* This is not a hard limit.  It's just here to prevent people from
++	bringing their slow machines to a grinding halt. */
++	else if(maxdatalen > 65536) {
++		printk(KERN_WARNING "layer7: maxdatalen can't be > 65536, "
++			"using 65536\n");
++		maxdatalen = 65536;
++	}
++	return xt_register_matches(xt_layer7_match,
++				   ARRAY_SIZE(xt_layer7_match));
++}
++
++static void __exit xt_layer7_fini(void)
++{
++	layer7_cleanup_proc();
++	xt_unregister_matches(xt_layer7_match, ARRAY_SIZE(xt_layer7_match));
++}
++
++module_init(xt_layer7_init);
++module_exit(xt_layer7_fini);
diff --git a/target/linux/generic-2.6/patches-2.6.27/101-netfilter_layer7_pktmatch.patch b/target/linux/generic-2.6/patches-2.6.27/101-netfilter_layer7_pktmatch.patch
index ad0fdb823f..0152957c21 100644
--- a/target/linux/generic-2.6/patches-2.6.27/101-netfilter_layer7_pktmatch.patch
+++ b/target/linux/generic-2.6/patches-2.6.27/101-netfilter_layer7_pktmatch.patch
@@ -1,3 +1,5 @@
+diff --git a/include/linux/netfilter/xt_layer7.h b/include/linux/netfilter/xt_layer7.h
+index 147cd64..c38d3c4 100644
 --- a/include/linux/netfilter/xt_layer7.h
 +++ b/include/linux/netfilter/xt_layer7.h
 @@ -8,6 +8,7 @@ struct xt_layer7_info {
@@ -8,9 +10,11 @@
  };
  
  #endif /* _XT_LAYER7_H */
+diff --git a/net/netfilter/xt_layer7.c b/net/netfilter/xt_layer7.c
+index a9b88d3..e0e962d 100644
 --- a/net/netfilter/xt_layer7.c
 +++ b/net/netfilter/xt_layer7.c
-@@ -297,34 +297,36 @@ static int match_no_append(struct nf_con
+@@ -314,33 +314,35 @@ static int match_no_append(struct nf_conn * conntrack,
  }
  
  /* add the new app data to the conntrack.  Return number of bytes added. */
@@ -20,10 +24,10 @@
  {
  	int length = 0, i;
 -	int oldlength = master_conntrack->layer7.app_data_len;
- 
--	/* This is a fix for a race condition by Deti Fliegl. However, I'm not
--	   clear on whether the race condition exists or whether this really
--	   fixes it.  I might just be being dense... Anyway, if it's not really
+-
+-	/* This is a fix for a race condition by Deti Fliegl. However, I'm not 
+-	   clear on whether the race condition exists or whether this really 
+-	   fixes it.  I might just be being dense... Anyway, if it's not really 
 -	   a fix, all it does is waste a very small amount of time. */
 -	if(!master_conntrack->layer7.app_data) return 0;
 +	if (!target) return 0;
@@ -32,12 +36,12 @@
  	do case insensitivity).  Add it to the end of the current data. */
 -	for(i = 0; i < maxdatalen-oldlength-1 &&
 -		   i < appdatalen; i++) {
-+	for(i = 0; i < maxdatalen-offset-1 && i < len; i++) {
++ 	for(i = 0; i < maxdatalen-offset-1 && i < len; i++) {
  		if(app_data[i] != '\0') {
  			/* the kernel version of tolower mungs 'upper ascii' */
 -			master_conntrack->layer7.app_data[length+oldlength] =
 +			target[length+offset] =
- 				isascii(app_data[i])?
+ 				isascii(app_data[i])? 
  					tolower(app_data[i]) : app_data[i];
  			length++;
  		}
@@ -46,21 +50,21 @@
 +
 +	return length;
 +}
- 
--	master_conntrack->layer7.app_data[length+oldlength] = '\0';
--	master_conntrack->layer7.app_data_len = length + oldlength;
++
 +/* add the new app data to the conntrack.  Return number of bytes added. */
 +static int add_data(struct nf_conn * master_conntrack,
 +                    char * app_data, int appdatalen)
 +{
 +	int length;
  
+-	master_conntrack->layer7.app_data[length+oldlength] = '\0';
+-	master_conntrack->layer7.app_data_len = length + oldlength;
 +	length = add_datastr(master_conntrack->layer7.app_data, master_conntrack->layer7.app_data_len, app_data, appdatalen);
 +	master_conntrack->layer7.app_data_len += length;
+ 
  	return length;
  }
- 
-@@ -411,7 +413,7 @@ match(const struct sk_buff *skbin,
+@@ -428,7 +430,7 @@ match(const struct sk_buff *skbin,
  	const struct xt_layer7_info * info = matchinfo;
  	enum ip_conntrack_info master_ctinfo, ctinfo;
  	struct nf_conn *master_conntrack, *conntrack;
@@ -69,18 +73,18 @@
  	unsigned int pattern_result, appdatalen;
  	regexp * comppattern;
  
-@@ -439,8 +441,8 @@ match(const struct sk_buff *skbin,
+@@ -456,8 +458,8 @@ match(const struct sk_buff *skbin,
  		master_conntrack = master_ct(master_conntrack);
  
  	/* if we've classified it or seen too many packets */
--	if(TOTAL_PACKETS > num_packets ||
+-	if(total_acct_packets(master_conntrack) > num_packets ||
 -	   master_conntrack->layer7.app_proto) {
-+	if(!info->pkt && (TOTAL_PACKETS > num_packets ||
++	if(!info->pkt && (total_acct_packets(master_conntrack) > num_packets ||
 +	   master_conntrack->layer7.app_proto)) {
  
- 		pattern_result = match_no_append(conntrack, master_conntrack,
+ 		pattern_result = match_no_append(conntrack, master_conntrack, 
  						 ctinfo, master_ctinfo, info);
-@@ -473,6 +475,25 @@ match(const struct sk_buff *skbin,
+@@ -490,6 +492,25 @@ match(const struct sk_buff *skbin,
  	/* the return value gets checked later, when we're ready to use it */
  	comppattern = compile_and_cache(info->pattern, info->protocol);
  
@@ -104,5 +108,5 @@
 +	}
 +
  	/* On the first packet of a connection, allocate space for app data */
- 	if(TOTAL_PACKETS == 1 && !skb->cb[0] &&
+ 	if(total_acct_packets(master_conntrack) == 1 && !skb->cb[0] && 
  	   !master_conntrack->layer7.app_data){