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

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

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
+-	/* 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
+-	   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
+-	   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;
  }
- 
+@@ -428,7 +430,7 @@ match(const struct sk_buff *skbin,
-@@ -411,7 +413,7 @@ 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){