2007-07-02 05:10:01 +03:00
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Index: linux-2.6.21.5/include/linux/netfilter_ipv4/ipt_layer7.h
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===================================================================
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--- linux-2.6.21.5.orig/include/linux/netfilter_ipv4/ipt_layer7.h 2007-07-02 00:43:58.271086750 +0200
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+++ linux-2.6.21.5/include/linux/netfilter_ipv4/ipt_layer7.h 2007-07-02 01:36:08.914739750 +0200
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2007-01-01 06:42:50 +02:00
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@@ -21,6 +21,7 @@
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char protocol[MAX_PROTOCOL_LEN];
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char invert:1;
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char pattern[MAX_PATTERN_LEN];
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+ char pkt;
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};
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#endif /* _IPT_LAYER7_H */
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2007-07-02 05:10:01 +03:00
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Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c
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===================================================================
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--- linux-2.6.21.5.orig/net/ipv4/netfilter/ipt_layer7.c 2007-07-02 01:27:54.195821750 +0200
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+++ linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c 2007-07-02 01:37:01.990056750 +0200
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@@ -299,33 +299,34 @@
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2007-01-01 06:42:50 +02:00
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}
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}
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-/* add the new app data to the conntrack. Return number of bytes added. */
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-static int add_data(struct ip_conntrack * master_conntrack,
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- char * app_data, int appdatalen)
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+static int add_datastr(char *target, int offset, char *app_data, int len)
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{
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int length = 0, i;
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- int oldlength = master_conntrack->layer7.app_data_len;
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-
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- // This is a fix for a race condition by Deti Fliegl. However, I'm not
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- // clear on whether the race condition exists or whether this really
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- // fixes it. I might just be being dense... Anyway, if it's not really
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- // a fix, all it does is waste a very small amount of time.
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- if(!master_conntrack->layer7.app_data) return 0;
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+ if(!target) return 0;
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/* Strip nulls. Make everything lower case (our regex lib doesn't
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do case insensitivity). Add it to the end of the current data. */
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- for(i = 0; i < maxdatalen-oldlength-1 &&
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- i < appdatalen; i++) {
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+ for(i = 0; i < maxdatalen-offset-1 && i < len; i++) {
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if(app_data[i] != '\0') {
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- master_conntrack->layer7.app_data[length+oldlength] =
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+ target[length+offset] =
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/* the kernel version of tolower mungs 'upper ascii' */
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isascii(app_data[i])? tolower(app_data[i]) : app_data[i];
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length++;
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}
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}
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+ target[length+offset] = '\0';
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- master_conntrack->layer7.app_data[length+oldlength] = '\0';
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- master_conntrack->layer7.app_data_len = length + oldlength;
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+ return length;
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+}
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+
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+/* add the new app data to the conntrack. Return number of bytes added. */
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+static int add_data(struct ip_conntrack * master_conntrack,
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+ char * app_data, int appdatalen)
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+{
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+ int length;
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+
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+ length = add_datastr(master_conntrack->layer7.app_data, master_conntrack->layer7.app_data_len, app_data, appdatalen);
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+ master_conntrack->layer7.app_data_len += length;
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return length;
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}
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2007-07-02 05:10:01 +03:00
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@@ -343,7 +344,7 @@
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2007-01-01 06:42:50 +02:00
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enum ip_conntrack_info master_ctinfo, ctinfo;
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2007-07-02 05:10:01 +03:00
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struct nf_conn *master_conntrack;
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struct ip_conntrack *conntrack;
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2007-01-01 06:42:50 +02:00
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- unsigned char * app_data;
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+ unsigned char *app_data, *tmp_data;
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unsigned int pattern_result, appdatalen;
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regexp * comppattern;
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2007-07-02 05:10:01 +03:00
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@@ -365,8 +366,8 @@
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2007-01-01 06:42:50 +02:00
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master_conntrack = master_ct(master_conntrack);
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/* if we've classified it or seen too many packets */
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- if(TOTAL_PACKETS > num_packets ||
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- master_conntrack->layer7.app_proto) {
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+ if(!info->pkt && (TOTAL_PACKETS > num_packets ||
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+ master_conntrack->layer7.app_proto)) {
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pattern_result = match_no_append(conntrack, master_conntrack, ctinfo, master_ctinfo, info);
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2007-07-02 05:10:01 +03:00
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@@ -396,6 +397,23 @@
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2007-01-01 06:42:50 +02:00
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comppattern = compile_and_cache(info->pattern, info->protocol);
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spin_unlock_bh(&list_lock);
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+ if (info->pkt) {
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+ tmp_data = kmalloc(maxdatalen, GFP_ATOMIC);
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+ if(!tmp_data){
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+ if (net_ratelimit())
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+ printk(KERN_ERR "layer7: out of memory in match, bailing.\n");
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+ return info->invert;
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+ }
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+
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+ tmp_data[0] = '\0';
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+ add_datastr(tmp_data, 0, app_data, appdatalen);
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+ pattern_result = ((comppattern && regexec(comppattern, tmp_data)) ? 1 : 0);
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+ kfree(tmp_data);
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+ tmp_data = NULL;
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+
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+ return (pattern_result ^ info->invert);
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+ }
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+
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/* On the first packet of a connection, allocate space for app data */
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write_lock(&ct_lock);
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if(TOTAL_PACKETS == 1 && !skb->cb[0] && !master_conntrack->layer7.app_data) {
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