diff options
Diffstat (limited to 'target/linux/generic-2.6/patches')
| -rw-r--r-- | target/linux/generic-2.6/patches/100-netfilter_layer7_2.17.patch (renamed from target/linux/generic-2.6/patches/100-netfilter_layer7_2.9.patch) | 685 | ||||
| -rw-r--r-- | target/linux/generic-2.6/patches/101-netfilter_layer7_pktmatch.patch | 83 | ||||
| -rw-r--r-- | target/linux/generic-2.6/patches/110-ipp2p_0.8.1rc1.patch | 41 | ||||
| -rw-r--r-- | target/linux/generic-2.6/patches/170-netfilter_chaostables.patch | 946 | ||||
| -rw-r--r-- | target/linux/generic-2.6/patches/170-netfilter_chaostables_0.8.patch | 853 | ||||
| -rw-r--r-- | target/linux/generic-2.6/patches/171-netfilter_tarpit.patch | 325 | ||||
| -rw-r--r-- | target/linux/generic-2.6/patches/999-backport_ip_hdr_and_friends.patch | 58 |
7 files changed, 1665 insertions, 1326 deletions
diff --git a/target/linux/generic-2.6/patches/100-netfilter_layer7_2.9.patch b/target/linux/generic-2.6/patches/100-netfilter_layer7_2.17.patch index 437f883e8a..52908b3076 100644 --- a/target/linux/generic-2.6/patches/100-netfilter_layer7_2.9.patch +++ b/target/linux/generic-2.6/patches/100-netfilter_layer7_2.17.patch @@ -1,80 +1,58 @@ -Index: linux-2.6.21.5/include/linux/netfilter_ipv4/ipt_layer7.h +Index: linux-2.6.21.7/net/netfilter/Kconfig =================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.21.5/include/linux/netfilter_ipv4/ipt_layer7.h 2007-07-02 00:43:58.271086750 +0200 -@@ -0,0 +1,26 @@ -+/* -+ By Matthew Strait <quadong@users.sf.net>, Dec 2003. -+ http://l7-filter.sf.net -+ -+ 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 -+*/ -+ -+#ifndef _IPT_LAYER7_H -+#define _IPT_LAYER7_H -+ -+#define MAX_PATTERN_LEN 8192 -+#define MAX_PROTOCOL_LEN 256 +--- linux-2.6.21.7.orig/net/netfilter/Kconfig ++++ linux-2.6.21.7/net/netfilter/Kconfig +@@ -640,6 +640,27 @@ config NETFILTER_XT_MATCH_STATE + + To compile it as a module, choose M here. If unsure, say N. + ++config NETFILTER_XT_MATCH_LAYER7 ++ tristate '"layer7" match support' ++ depends on NETFILTER_XTABLES ++ depends on EXPERIMENTAL && (IP_NF_CONNTRACK || NF_CONNTRACK) ++ depends on NF_CT_ACCT ++ help ++ Say Y if you want to be able to classify connections (and their ++ packets) based on regular expression matching of their application ++ layer data. This is one way to classify applications such as ++ peer-to-peer filesharing systems that do not always use the same ++ port. + -+typedef char *(*proc_ipt_search) (char *, char, char *); ++ To compile it as a module, choose M here. If unsure, say N. + -+struct ipt_layer7_info { -+ char protocol[MAX_PROTOCOL_LEN]; -+ char invert:1; -+ char pattern[MAX_PATTERN_LEN]; -+}; ++config NETFILTER_XT_MATCH_LAYER7_DEBUG ++ bool 'Layer 7 debugging output' ++ depends on NETFILTER_XT_MATCH_LAYER7 ++ help ++ Say Y to get lots of debugging output. + -+#endif /* _IPT_LAYER7_H */ -Index: linux-2.6.21.5/net/ipv4/netfilter/ip_conntrack_core.c -=================================================================== ---- linux-2.6.21.5.orig/net/ipv4/netfilter/ip_conntrack_core.c 2007-07-02 00:37:53.432285750 +0200 -+++ linux-2.6.21.5/net/ipv4/netfilter/ip_conntrack_core.c 2007-07-02 00:37:55.496414750 +0200 -@@ -332,6 +332,13 @@ - * too. */ - ip_ct_remove_expectations(ct); - -+ #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE) -+ if(ct->layer7.app_proto) -+ kfree(ct->layer7.app_proto); -+ if(ct->layer7.app_data) -+ kfree(ct->layer7.app_data); -+ #endif + - /* We overload first tuple to link into unconfirmed list. */ - if (!is_confirmed(ct)) { - BUG_ON(list_empty(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list)); -Index: linux-2.6.21.5/net/ipv4/netfilter/ip_conntrack_standalone.c + config NETFILTER_XT_MATCH_STATISTIC + tristate '"statistic" match support' + depends on NETFILTER_XTABLES +Index: linux-2.6.21.7/net/netfilter/Makefile =================================================================== ---- linux-2.6.21.5.orig/net/ipv4/netfilter/ip_conntrack_standalone.c 2007-07-02 00:37:53.440286250 +0200 -+++ linux-2.6.21.5/net/ipv4/netfilter/ip_conntrack_standalone.c 2007-07-02 00:37:55.544417750 +0200 -@@ -188,6 +188,12 @@ - return -ENOSPC; - #endif - -+#if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE) -+ if(conntrack->layer7.app_proto) -+ if (seq_printf(s, "l7proto=%s ",conntrack->layer7.app_proto)) -+ return 1; -+#endif -+ - if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use))) - return -ENOSPC; - -Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c +--- linux-2.6.21.7.orig/net/netfilter/Makefile ++++ linux-2.6.21.7/net/netfilter/Makefile +@@ -68,6 +68,7 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) + + obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o + obj-$(CONFIG_NETFILTER_XT_MATCH_SCTP) += xt_sctp.o + obj-$(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 +Index: linux-2.6.21.7/net/netfilter/xt_layer7.c =================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c 2007-07-02 01:27:54.195821750 +0200 -@@ -0,0 +1,583 @@ +--- /dev/null ++++ linux-2.6.21.7/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 + -+ By Matthew Strait and Ethan Sommer, 2003-2006. ++ (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 @@ -82,37 +60,37 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + 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> -+ and cls_layer7.c (C) 2003 Matthew Strait, Ethan Sommer, Justin Levandoski -+ -+ Jan Engelhardt, 2007-03-11: Arrange to compile with nf_conntrack ++ 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/module.h> -+#include <linux/skbuff.h> -+#include <linux/proc_fs.h> -+#include <linux/ctype.h> ++#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_nat_rule.h> -+#include <linux/spinlock.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" + -+#include <linux/netfilter_ipv4/ipt_layer7.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+ -+MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>"); +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_VERSION("2.0"); ++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_IP_NF_MATCH_LAYER7_DEBUG ++#ifdef CONFIG_NETFILTER_XT_MATCH_LAYER7_DEBUG + #define DPRINTK(format,args...) printk(format,##args) +#else + #define DPRINTK(format,args...) @@ -131,23 +109,7 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + struct pattern_cache * next; +} * first_pattern_cache = NULL; + -+/* I'm new to locking. Here are my assumptions: -+ -+- No one will write to /proc/net/layer7_numpackets over and over very fast; -+ if they did, nothing awful would happen. -+ -+- This code will never be processing the same packet twice at the same time, -+ because iptables rules are traversed in order. -+ -+- It doesn't matter if two packets from different connections are in here at -+ the same time, because they don't share any data. -+ -+- It _does_ matter if two packets from the same connection (or one from a -+ master and one from its child) are here at the same time. In this case, -+ we have to protect the conntracks and the list of compiled patterns. -+*/ -+DEFINE_RWLOCK(ct_lock); -+DEFINE_SPINLOCK(list_lock); ++DEFINE_SPINLOCK(l7_lock); + +#ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG +/* Converts an unfriendly string into a friendly one by @@ -159,7 +121,8 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + + if(!f) { + if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in friendly_print, bailing.\n"); ++ printk(KERN_ERR "layer7: out of memory in " ++ "friendly_print, bailing.\n"); + return NULL; + } + @@ -176,14 +139,14 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c +{ + switch (i) { + case 0 ... 9: -+ return (char)(i + '0'); ++ return (i + '0'); + break; + case 10 ... 15: -+ return (char)(i - 10 + 'a'); ++ return (i - 10 + 'a'); + break; + default: + if (net_ratelimit()) -+ printk("Problem in dec2hex\n"); ++ printk("layer7: Problem in dec2hex\n"); + return '\0'; + } +} @@ -195,7 +158,8 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + + if(!g) { + if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in hex_print, bailing.\n"); ++ printk(KERN_ERR "layer7: out of memory in hex_print, " ++ "bailing.\n"); + return NULL; + } + @@ -212,7 +176,8 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + +/* 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(char * regex_string, char * protocol) ++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; @@ -234,7 +199,8 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + + if(!tmp) { + if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n"); ++ printk(KERN_ERR "layer7: out of memory in " ++ "compile_and_cache, bailing.\n"); + return NULL; + } + @@ -244,7 +210,8 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + + if(!tmp->regex_string || !tmp->pattern) { + if (net_ratelimit()) -+ printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n"); ++ printk(KERN_ERR "layer7: out of memory in " ++ "compile_and_cache, bailing.\n"); + kfree(tmp->regex_string); + kfree(tmp->pattern); + kfree(tmp); @@ -262,10 +229,12 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + /* copy the string and compile the regex */ + len = strlen(regex_string); + DPRINTK("About to compile this: \"%s\"\n", regex_string); -+ node->pattern = regcomp(regex_string, &len); ++ 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); ++ 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. */ + } + @@ -275,11 +244,11 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + +static int can_handle(const struct sk_buff *skb) +{ -+ if(!skb->nh.iph) /* not IP */ ++ if(!ip_hdr(skb)) /* not IP */ + return 0; -+ if(skb->nh.iph->protocol != IPPROTO_TCP && -+ skb->nh.iph->protocol != IPPROTO_UDP && -+ skb->nh.iph->protocol != IPPROTO_ICMP) ++ if(ip_hdr(skb)->protocol != IPPROTO_TCP && ++ ip_hdr(skb)->protocol != IPPROTO_UDP && ++ ip_hdr(skb)->protocol != IPPROTO_ICMP) + return 0; + return 1; +} @@ -287,11 +256,11 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c +/* 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 skb->nh.iph ++ /* 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*skb->nh.iph->ihl; ++ int ip_hl = 4*ip_hdr(skb)->ihl; + -+ if( skb->nh.iph->protocol == IPPROTO_TCP ) { ++ 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 @@ -299,31 +268,36 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4); + + return ip_hl + tcp_hl; -+ } else if( skb->nh.iph->protocol == IPPROTO_UDP ) { ++ } else if( ip_hdr(skb)->protocol == IPPROTO_UDP ) { + return ip_hl + 8; /* UDP header is always 8 bytes */ -+ } else if( skb->nh.iph->protocol == IPPROTO_ICMP ) { ++ } 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"); ++ 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 ip_conntrack * conntrack, struct ip_conntrack * master_conntrack, -+ enum ip_conntrack_info ctinfo, enum ip_conntrack_info master_ctinfo, -+ struct ipt_layer7_info * info) ++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 */ -+ write_lock(&ct_lock); + 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", ++ 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); @@ -334,53 +308,54 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + kfree(master_conntrack->layer7.app_data); + master_conntrack->layer7.app_data = NULL; /* don't free again */ + } -+ write_unlock(&ct_lock); + + if(master_conntrack->layer7.app_proto){ -+ /* Here child connections set their .app_proto (for /proc/net/ip_conntrack) */ -+ write_lock(&ct_lock); ++ /* 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); ++ 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"); -+ write_unlock(&ct_lock); ++ 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); ++ strcpy(conntrack->layer7.app_proto, ++ master_conntrack->layer7.app_proto); + } -+ write_unlock(&ct_lock); + -+ return (!strcmp(master_conntrack->layer7.app_proto, info->protocol)); ++ 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. */ -+ write_lock(&ct_lock); -+ master_conntrack->layer7.app_proto = kmalloc(strlen("unknown")+1, GFP_ATOMIC); ++ 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"); -+ write_unlock(&ct_lock); ++ printk(KERN_ERR "layer7: out of memory in " ++ "match_no_append, bailing.\n"); + return 1; + } + strcpy(master_conntrack->layer7.app_proto, "unknown"); -+ write_unlock(&ct_lock); + return 0; + } +} + +/* add the new app data to the conntrack. Return number of bytes added. */ -+static int add_data(struct ip_conntrack * master_conntrack, -+ char * app_data, int appdatalen) ++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. ++ /* 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 @@ -388,9 +363,10 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + 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] = -+ /* the kernel version of tolower mungs 'upper ascii' */ -+ isascii(app_data[i])? tolower(app_data[i]) : app_data[i]; ++ isascii(app_data[i])? ++ tolower(app_data[i]) : app_data[i]; + length++; + } + } @@ -401,33 +377,109 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + return length; +} + -+/* Returns true on match and false otherwise. */ -+static int 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, int *hotdrop) ++/* 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 int ++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, ++ int *hotdrop) +{ + /* sidestep const without getting a compiler warning... */ + struct sk_buff * skb = (struct sk_buff *)skbin; + -+ struct ipt_layer7_info * info = (struct ipt_layer7_info *)matchinfo; ++ const struct xt_layer7_info * info = matchinfo; + enum ip_conntrack_info master_ctinfo, ctinfo; -+ struct nf_conn *master_conntrack; -+ struct ip_conntrack *conntrack; ++ 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 = ip_conntrack_get((struct sk_buff *)skb, &ctinfo)) == NULL) || -+ ((master_conntrack = ip_conntrack_get((struct sk_buff *)skb, &master_ctinfo)) == NULL)) { ++ 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; + } + @@ -439,95 +491,100 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + if(TOTAL_PACKETS > num_packets || + master_conntrack->layer7.app_proto) { + -+ pattern_result = match_no_append(conntrack, master_conntrack, ctinfo, master_ctinfo, info); ++ 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 is probably irrelevant, but consistant */ ++ /* 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"); ++ 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 - app_data; ++ appdatalen = skb_tail_pointer(skb) - app_data; + -+ spin_lock_bh(&list_lock); + /* the return value gets checked later, when we're ready to use it */ + comppattern = compile_and_cache(info->pattern, info->protocol); -+ spin_unlock_bh(&list_lock); + + /* On the first packet of a connection, allocate space for app data */ -+ write_lock(&ct_lock); -+ if(TOTAL_PACKETS == 1 && !skb->cb[0] && !master_conntrack->layer7.app_data) { -+ master_conntrack->layer7.app_data = kmalloc(maxdatalen, GFP_ATOMIC); ++ 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"); -+ write_unlock(&ct_lock); ++ 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'; + } -+ write_unlock(&ct_lock); + + /* Can be here, but unallocated, if numpackets is increased near + the beginning of a connection */ -+ if(master_conntrack->layer7.app_data == NULL) ++ if(master_conntrack->layer7.app_data == NULL){ ++ spin_unlock_bh(&l7_lock); + return (info->invert); /* unmatched */ ++ } + + if(!skb->cb[0]){ + int newbytes; -+ write_lock(&ct_lock); + newbytes = add_data(master_conntrack, app_data, appdatalen); -+ write_unlock(&ct_lock); + + 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. */ -+ read_lock(&ct_lock); + 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); ++ 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)) { ++ } else if(comppattern && ++ regexec(comppattern, master_conntrack->layer7.app_data)){ + DPRINTK("layer7: matched %s\n", info->protocol); + pattern_result = 1; + } else pattern_result = 0; -+ read_unlock(&ct_lock); + + if(pattern_result == 1) { -+ write_lock(&ct_lock); -+ master_conntrack->layer7.app_proto = kmalloc(strlen(info->protocol)+1, GFP_ATOMIC); ++ 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"); -+ write_unlock(&ct_lock); ++ 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); -+ write_unlock(&ct_lock); + } else if(pattern_result > 1) { /* cleanup from "unset" */ + pattern_result = 1; + } @@ -535,169 +592,99 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + /* mark the packet seen */ + skb->cb[0] = 1; + ++ spin_unlock_bh(&l7_lock); + return (pattern_result ^ info->invert); +} + -+static struct xt_match layer7_match = { -+ .name = "layer7", -+ .match = &match, -+ .matchsize = sizeof(struct ipt_layer7_info), -+ .family = AF_INET, -+ .me = THIS_MODULE -+}; ++static int check(const char *tablename, ++ const void *inf, ++ const struct xt_match *match, ++ void *matchinfo, ++ unsigned int hook_mask) + -+/* 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; -+ } -+ } ++ // 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; +} + -+/* write out num_packets to userland. */ -+static int layer7_read_proc(char* page, char ** start, off_t off, int count, -+ int* eof, void * data) ++static void ++destroy(const struct xt_match *match, void *matchinfo) +{ -+ 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; ++ nf_ct_l3proto_module_put(match->family); +} + -+/* Read in num_packets from userland */ -+static int layer7_write_proc(struct file* file, const char* buffer, -+ unsigned long count, void *data) ++static struct xt_match xt_layer7_match[] = { +{ -+ 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; -+ } ++ .name = "layer7", ++ .family = AF_INET, ++ .checkentry = check, ++ .match = match, ++ .destroy = destroy, ++ .matchsize = sizeof(struct xt_layer7_info), ++ .me = THIS_MODULE ++} ++}; + -+ return count; ++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 void layer7_cleanup_proc(void) -+{ -+ remove_proc_entry("layer7_numpackets", proc_net); -+} -+ -+static int __init ipt_layer7_init(void) ++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"); ++ 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"); ++ printk(KERN_WARNING "layer7: maxdatalen can't be > 65536, " ++ "using 65536\n"); + maxdatalen = 65536; + } -+ return xt_register_match(&layer7_match); ++ return xt_register_matches(xt_layer7_match, ++ ARRAY_SIZE(xt_layer7_match)); +} + -+static void __exit ipt_layer7_fini(void) ++static void __exit xt_layer7_fini(void) +{ + layer7_cleanup_proc(); -+ xt_unregister_match(&layer7_match); ++ xt_unregister_matches(xt_layer7_match, ARRAY_SIZE(xt_layer7_match)); +} + -+module_init(ipt_layer7_init); -+module_exit(ipt_layer7_fini); -Index: linux-2.6.21.5/net/ipv4/netfilter/Kconfig -=================================================================== ---- linux-2.6.21.5.orig/net/ipv4/netfilter/Kconfig 2007-07-02 00:37:53.456287250 +0200 -+++ linux-2.6.21.5/net/ipv4/netfilter/Kconfig 2007-07-02 01:21:17.231013000 +0200 -@@ -245,6 +245,24 @@ - - To compile it as a module, choose M here. If unsure, say N. - -+config IP_NF_MATCH_LAYER7 -+ tristate "Layer 7 match support (EXPERIMENTAL)" -+ depends on IP_NF_IPTABLES && NF_CT_ACCT && NF_CONNTRACK && EXPERIMENTAL -+ help -+ Say Y if you want to be able to classify connections (and their -+ packets) based on regular expression matching of their application -+ layer data. This is one way to classify applications such as -+ peer-to-peer filesharing systems that do not always use the same -+ port. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ -+config IP_NF_MATCH_LAYER7_DEBUG -+ bool "Layer 7 debugging output" -+ depends on IP_NF_MATCH_LAYER7 -+ help -+ Say Y to get lots of debugging output. -+ - config IP_NF_MATCH_TOS - tristate "TOS match support" - depends on IP_NF_IPTABLES -Index: linux-2.6.21.5/net/ipv4/netfilter/Makefile ++module_init(xt_layer7_init); ++module_exit(xt_layer7_fini); +Index: linux-2.6.21.7/net/netfilter/regexp/regexp.c =================================================================== ---- linux-2.6.21.5.orig/net/ipv4/netfilter/Makefile 2007-07-02 00:37:53.464287750 +0200 -+++ linux-2.6.21.5/net/ipv4/netfilter/Makefile 2007-07-02 00:43:58.191081750 +0200 -@@ -92,6 +92,8 @@ - obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o - obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o - -+obj-$(CONFIG_IP_NF_MATCH_LAYER7) += ipt_layer7.o -+ - # targets - obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o - obj-$(CONFIG_IP_NF_TARGET_TOS) += ipt_TOS.o -Index: linux-2.6.21.5/net/ipv4/netfilter/regexp/regexp.c -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.21.5/net/ipv4/netfilter/regexp/regexp.c 2007-07-02 00:37:55.648424250 +0200 +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/regexp/regexp.c @@ -0,0 +1,1197 @@ +/* + * regcomp and regexec -- regsub and regerror are elsewhere @@ -1896,10 +1883,10 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/regexp/regexp.c +#endif + + -Index: linux-2.6.21.5/net/ipv4/netfilter/regexp/regexp.h +Index: linux-2.6.21.7/net/netfilter/regexp/regexp.h =================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.21.5/net/ipv4/netfilter/regexp/regexp.h 2007-07-02 00:37:55.700427500 +0200 +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/regexp/regexp.h @@ -0,0 +1,41 @@ +/* + * Definitions etc. for regexp(3) routines. @@ -1942,20 +1929,20 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/regexp/regexp.h +void regerror(char *s); + +#endif -Index: linux-2.6.21.5/net/ipv4/netfilter/regexp/regmagic.h +Index: linux-2.6.21.7/net/netfilter/regexp/regmagic.h =================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.21.5/net/ipv4/netfilter/regexp/regmagic.h 2007-07-02 00:37:55.724429000 +0200 +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/regexp/regmagic.h @@ -0,0 +1,5 @@ +/* + * The first byte of the regexp internal "program" is actually this magic + * number; the start node begins in the second byte. + */ +#define MAGIC 0234 -Index: linux-2.6.21.5/net/ipv4/netfilter/regexp/regsub.c +Index: linux-2.6.21.7/net/netfilter/regexp/regsub.c =================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.21.5/net/ipv4/netfilter/regexp/regsub.c 2007-07-02 00:37:55.752430750 +0200 +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/regexp/regsub.c @@ -0,0 +1,95 @@ +/* + * regsub @@ -2052,15 +2039,53 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/regexp/regsub.c + } + *dst++ = '\0'; +} -Index: linux-2.6.21.5/include/net/netfilter/nf_conntrack.h +Index: linux-2.6.21.7/net/netfilter/nf_conntrack_core.c +=================================================================== +--- linux-2.6.21.7.orig/net/netfilter/nf_conntrack_core.c ++++ linux-2.6.21.7/net/netfilter/nf_conntrack_core.c +@@ -352,6 +352,14 @@ 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 ++ ++ + /* We overload first tuple to link into unconfirmed list. */ + if (!nf_ct_is_confirmed(ct)) { + BUG_ON(list_empty(&ct->tuplehash[IP_CT_DIR_ORIGINAL].list)); +Index: linux-2.6.21.7/net/netfilter/nf_conntrack_standalone.c +=================================================================== +--- linux-2.6.21.7.orig/net/netfilter/nf_conntrack_standalone.c ++++ linux-2.6.21.7/net/netfilter/nf_conntrack_standalone.c +@@ -195,7 +195,12 @@ static int ct_seq_show(struct seq_file * + return -ENOSPC; + #endif + +- if (seq_printf(s, "use=%u\n", atomic_read(&conntrack->ct_general.use))) ++#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) ++ if(conntrack->layer7.app_proto) ++ if(seq_printf(s, "l7proto=%s ", conntrack->layer7.app_proto)) ++ return -ENOSPC; ++#endif ++ if (seq_printf(s, "asdfuse=%u\n", atomic_read(&conntrack->ct_general.use))) + return -ENOSPC; + + return 0; +Index: linux-2.6.21.7/include/net/netfilter/nf_conntrack.h =================================================================== ---- linux-2.6.21.5.orig/include/net/netfilter/nf_conntrack.h 2007-07-02 00:49:22.815369500 +0200 -+++ linux-2.6.21.5/include/net/netfilter/nf_conntrack.h 2007-07-02 00:56:21.413530250 +0200 -@@ -128,6 +128,21 @@ +--- linux-2.6.21.7.orig/include/net/netfilter/nf_conntrack.h ++++ linux-2.6.21.7/include/net/netfilter/nf_conntrack.h +@@ -128,6 +128,22 @@ struct nf_conn u_int32_t secmark; #endif -+#if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE) ++#if defined(CONFIG_NETFILTER_XT_MATCH_LAYER7) || \ ++ defined(CONFIG_NETFILTER_XT_MATCH_LAYER7_MODULE) + struct { + /* + * e.g. "http". NULL before decision. "unknown" after decision @@ -2078,3 +2103,21 @@ Index: linux-2.6.21.5/include/net/netfilter/nf_conntrack.h /* Storage reserved for other modules: */ union nf_conntrack_proto proto; +Index: linux-2.6.21.7/include/linux/netfilter/xt_layer7.h +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/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/target/linux/generic-2.6/patches/101-netfilter_layer7_pktmatch.patch b/target/linux/generic-2.6/patches/101-netfilter_layer7_pktmatch.patch index 966353ad2f..cabffacc14 100644 --- a/target/linux/generic-2.6/patches/101-netfilter_layer7_pktmatch.patch +++ b/target/linux/generic-2.6/patches/101-netfilter_layer7_pktmatch.patch @@ -1,37 +1,37 @@ -Index: linux-2.6.21.5/include/linux/netfilter_ipv4/ipt_layer7.h +Index: linux-2.6.21.7/include/linux/netfilter/xt_layer7.h =================================================================== ---- linux-2.6.21.5.orig/include/linux/netfilter_ipv4/ipt_layer7.h 2007-07-02 00:43:58.271086750 +0200 -+++ linux-2.6.21.5/include/linux/netfilter_ipv4/ipt_layer7.h 2007-07-02 01:36:08.914739750 +0200 -@@ -21,6 +21,7 @@ +--- linux-2.6.21.7.orig/include/linux/netfilter/xt_layer7.h ++++ linux-2.6.21.7/include/linux/netfilter/xt_layer7.h +@@ -8,6 +8,7 @@ struct xt_layer7_info { char protocol[MAX_PROTOCOL_LEN]; - char invert:1; char pattern[MAX_PATTERN_LEN]; -+ char pkt; + u_int8_t invert; ++ u_int8_t pkt; }; - #endif /* _IPT_LAYER7_H */ -Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + #endif /* _XT_LAYER7_H */ +Index: linux-2.6.21.7/net/netfilter/xt_layer7.c =================================================================== ---- linux-2.6.21.5.orig/net/ipv4/netfilter/ipt_layer7.c 2007-07-02 01:27:54.195821750 +0200 -+++ linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c 2007-07-02 01:37:01.990056750 +0200 -@@ -299,33 +299,34 @@ - } +--- linux-2.6.21.7.orig/net/netfilter/xt_layer7.c ++++ linux-2.6.21.7/net/netfilter/xt_layer7.c +@@ -297,34 +297,36 @@ static int match_no_append(struct nf_con } --/* add the new app data to the conntrack. Return number of bytes added. */ --static int add_data(struct ip_conntrack * master_conntrack, -- char * app_data, int appdatalen) + /* 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) +static int add_datastr(char *target, int offset, char *app_data, int len) { 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. +- /* 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; ++ ++ if (!target) 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. */ @@ -39,54 +39,55 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c - i < appdatalen; 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] = - /* the kernel version of tolower mungs 'upper ascii' */ - isascii(app_data[i])? tolower(app_data[i]) : app_data[i]; + isascii(app_data[i])? + tolower(app_data[i]) : app_data[i]; length++; } } + target[length+offset] = '\0'; ++ ++ return length; ++} - master_conntrack->layer7.app_data[length+oldlength] = '\0'; - master_conntrack->layer7.app_data_len = length + oldlength; -+ return length; -+} -+ +/* add the new app data to the conntrack. Return number of bytes added. */ -+static int add_data(struct ip_conntrack * master_conntrack, -+ char * app_data, int appdatalen) ++static int add_data(struct nf_conn * master_conntrack, ++ char * app_data, int appdatalen) +{ + int length; -+ + + 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; } -@@ -343,7 +344,7 @@ + +@@ -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; - struct ip_conntrack *conntrack; + struct nf_conn *master_conntrack, *conntrack; - unsigned char * app_data; + unsigned char *app_data, *tmp_data; unsigned int pattern_result, appdatalen; regexp * comppattern; -@@ -365,8 +366,8 @@ +@@ -439,8 +441,8 @@ 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 || - master_conntrack->layer7.app_proto) { + if(!info->pkt && (TOTAL_PACKETS > num_packets || -+ master_conntrack->layer7.app_proto)) { - - pattern_result = match_no_append(conntrack, master_conntrack, ctinfo, master_ctinfo, info); ++ master_conntrack->layer7.app_proto)) { -@@ -396,6 +397,23 @@ + pattern_result = match_no_append(conntrack, master_conntrack, + ctinfo, master_ctinfo, info); +@@ -473,6 +475,25 @@ 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); - spin_unlock_bh(&list_lock); + if (info->pkt) { + tmp_data = kmalloc(maxdatalen, GFP_ATOMIC); @@ -99,12 +100,14 @@ Index: linux-2.6.21.5/net/ipv4/netfilter/ipt_layer7.c + tmp_data[0] = '\0'; + add_datastr(tmp_data, 0, app_data, appdatalen); + pattern_result = ((comppattern && regexec(comppattern, tmp_data)) ? 1 : 0); ++ + kfree(tmp_data); + tmp_data = NULL; ++ spin_unlock_bh(&l7_lock); + + return (pattern_result ^ info->invert); + } + /* On the first packet of a connection, allocate space for app data */ - write_lock(&ct_lock); - if(TOTAL_PACKETS == 1 && !skb->cb[0] && !master_conntrack->layer7.app_data) { + if(TOTAL_PACKETS == 1 && !skb->cb[0] && + !master_conntrack->layer7.app_data){ diff --git a/target/linux/generic-2.6/patches/110-ipp2p_0.8.1rc1.patch b/target/linux/generic-2.6/patches/110-ipp2p_0.8.1rc1.patch index 509c5eb169..5f202ca99e 100644 --- a/target/linux/generic-2.6/patches/110-ipp2p_0.8.1rc1.patch +++ b/target/linux/generic-2.6/patches/110-ipp2p_0.8.1rc1.patch @@ -1,6 +1,7 @@ -diff -urN linux-2.6.21.1.old/include/linux/netfilter_ipv4/ipt_ipp2p.h linux-2.6.21.1.dev/include/linux/netfilter_ipv4/ipt_ipp2p.h ---- linux-2.6.21.1.old/include/linux/netfilter_ipv4/ipt_ipp2p.h 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/include/linux/netfilter_ipv4/ipt_ipp2p.h 2007-05-26 20:21:54.586864296 +0200 +Index: linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_ipp2p.h +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/include/linux/netfilter_ipv4/ipt_ipp2p.h @@ -0,0 +1,31 @@ +#ifndef __IPT_IPP2P_H +#define __IPT_IPP2P_H @@ -33,9 +34,10 @@ diff -urN linux-2.6.21.1.old/include/linux/netfilter_ipv4/ipt_ipp2p.h linux-2.6. +#define IPP2P_MUTE (1 << 14) +#define IPP2P_WASTE (1 << 15) +#define IPP2P_XDCC (1 << 16) -diff -urN linux-2.6.21.1.old/net/ipv4/netfilter/ipt_ipp2p.c linux-2.6.21.1.dev/net/ipv4/netfilter/ipt_ipp2p.c ---- linux-2.6.21.1.old/net/ipv4/netfilter/ipt_ipp2p.c 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/net/ipv4/netfilter/ipt_ipp2p.c 2007-05-26 20:21:54.587864144 +0200 +Index: linux-2.6.21.7/net/ipv4/netfilter/ipt_ipp2p.c +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/net/ipv4/netfilter/ipt_ipp2p.c @@ -0,0 +1,882 @@ +#if defined(MODVERSIONS) +#include <linux/modversions.h> @@ -782,7 +784,7 @@ diff -urN linux-2.6.21.1.old/net/ipv4/netfilter/ipt_ipp2p.c linux-2.6.21.1.dev/n +{ + const struct ipt_p2p_info *info = matchinfo; + unsigned char *haystack; -+ struct iphdr *ip = skb->nh.iph; ++ struct iphdr *ip = ip_hdr(skb); + int p2p_result = 0, i = 0; +// int head_len; + int hlen = ntohs(ip->tot_len)-(ip->ihl*4); /*hlen = packet-data length*/ @@ -919,12 +921,13 @@ diff -urN linux-2.6.21.1.old/net/ipv4/netfilter/ipt_ipp2p.c linux-2.6.21.1.dev/n +module_exit(fini); + + -diff -urN linux-2.6.21.1.old/net/ipv4/netfilter/Kconfig linux-2.6.21.1.dev/net/ipv4/netfilter/Kconfig ---- linux-2.6.21.1.old/net/ipv4/netfilter/Kconfig 2007-05-26 20:17:47.626407992 +0200 -+++ linux-2.6.21.1.dev/net/ipv4/netfilter/Kconfig 2007-05-26 20:21:54.587864144 +0200 -@@ -263,6 +263,12 @@ - help - Say Y to get lots of debugging output. +Index: linux-2.6.21.7/net/ipv4/netfilter/Kconfig +=================================================================== +--- linux-2.6.21.7.orig/net/ipv4/netfilter/Kconfig ++++ linux-2.6.21.7/net/ipv4/netfilter/Kconfig +@@ -245,6 +245,12 @@ config IP_NF_MATCH_IPRANGE + + To compile it as a module, choose M here. If unsure, say N. +config IP_NF_MATCH_IPP2P + tristate "IPP2P" @@ -935,15 +938,15 @@ diff -urN linux-2.6.21.1.old/net/ipv4/netfilter/Kconfig linux-2.6.21.1.dev/net/i config IP_NF_MATCH_TOS tristate "TOS match support" depends on IP_NF_IPTABLES -diff -urN linux-2.6.21.1.old/net/ipv4/netfilter/Makefile linux-2.6.21.1.dev/net/ipv4/netfilter/Makefile ---- linux-2.6.21.1.old/net/ipv4/netfilter/Makefile 2007-05-26 20:17:47.638406168 +0200 -+++ linux-2.6.21.1.dev/net/ipv4/netfilter/Makefile 2007-05-26 20:21:54.588863992 +0200 -@@ -91,7 +91,7 @@ +Index: linux-2.6.21.7/net/ipv4/netfilter/Makefile +=================================================================== +--- linux-2.6.21.7.orig/net/ipv4/netfilter/Makefile ++++ linux-2.6.21.7/net/ipv4/netfilter/Makefile +@@ -91,6 +91,7 @@ obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o -- +obj-$(CONFIG_IP_NF_MATCH_IPP2P) += ipt_ipp2p.o - obj-$(CONFIG_IP_NF_MATCH_LAYER7) += ipt_layer7.o # targets + obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o diff --git a/target/linux/generic-2.6/patches/170-netfilter_chaostables.patch b/target/linux/generic-2.6/patches/170-netfilter_chaostables.patch deleted file mode 100644 index 2c24975f54..0000000000 --- a/target/linux/generic-2.6/patches/170-netfilter_chaostables.patch +++ /dev/null @@ -1,946 +0,0 @@ -diff -urN linux-2.6.21.1.old/include/linux/netfilter/oot_conntrack.h linux-2.6.21.1.dev/include/linux/netfilter/oot_conntrack.h ---- linux-2.6.21.1.old/include/linux/netfilter/oot_conntrack.h 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/include/linux/netfilter/oot_conntrack.h 2007-05-26 20:40:10.922195992 +0200 -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include <linux/netfilter_ipv4/ip_conntrack.h> -+#else /* linux-2.6.20+ */ -+# include <net/netfilter/nf_nat_rule.h> -+#endif -diff -urN linux-2.6.21.1.old/include/linux/netfilter/oot_trans.h linux-2.6.21.1.dev/include/linux/netfilter/oot_trans.h ---- linux-2.6.21.1.old/include/linux/netfilter/oot_trans.h 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/include/linux/netfilter/oot_trans.h 2007-05-26 20:40:10.940193256 +0200 -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include <linux/version.h> -+#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) -+# define HAVE_MATCHINFOSIZE 1 -+# define HAVE_TARGUSERINFO 1 -+# define HAVE_TARGINFOSIZE 1 -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) -+# define nfmark mark -+#endif -+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) -+# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ -+ tcp_v4_check((tcph_sz), (s), (d), (csp)) -+#endif -diff -urN linux-2.6.21.1.old/include/linux/netfilter/xt_CHAOS.h linux-2.6.21.1.dev/include/linux/netfilter/xt_CHAOS.h ---- linux-2.6.21.1.old/include/linux/netfilter/xt_CHAOS.h 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/include/linux/netfilter/xt_CHAOS.h 2007-05-26 20:40:10.940193256 +0200 -@@ -0,0 +1,14 @@ -+#ifndef _LINUX_XT_CHAOS_H -+#define _LINUX_XT_CHAOS_H 1 -+ -+enum xt_chaos_variant { -+ XTCHAOS_NORMAL, -+ XTCHAOS_TARPIT, -+ XTCHAOS_DELUDE, -+}; -+ -+struct xt_chaos_info { -+ enum xt_chaos_variant variant; -+}; -+ -+#endif /* _LINUX_XT_CHAOS_H */ -diff -urN linux-2.6.21.1.old/include/linux/netfilter/xt_portscan.h linux-2.6.21.1.dev/include/linux/netfilter/xt_portscan.h ---- linux-2.6.21.1.old/include/linux/netfilter/xt_portscan.h 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/include/linux/netfilter/xt_portscan.h 2007-05-26 20:40:10.940193256 +0200 -@@ -0,0 +1,8 @@ -+#ifndef _LINUX_XT_PORTSCAN_H -+#define _LINUX_XT_PORTSCAN_H 1 -+ -+struct xt_portscan_info { -+ unsigned int match_stealth, match_syn, match_cn, match_gr; -+}; -+ -+#endif /* _LINUX_XT_PORTSCAN_H */ -diff -urN linux-2.6.21.1.old/net/netfilter/find_match.c linux-2.6.21.1.dev/net/netfilter/find_match.c ---- linux-2.6.21.1.old/net/netfilter/find_match.c 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/net/netfilter/find_match.c 2007-05-26 20:40:10.970188696 +0200 -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> -+ 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/err.h> -+#include <linux/netfilter_arp.h> -+#include <linux/socket.h> -+#include <linux/netfilter/x_tables.h> -+ -+/* -+ * Yeah this code is sub-optimal, but the function is missing in -+ * mainline so far. -jengelh -+ */ -+static struct xt_match *xt_request_find_match_lo(int af, const char *name, -+ u8 revision) -+{ -+ static const char *const xt_prefix[] = { -+ [AF_INET] = "ip", -+ [AF_INET6] = "ip6", -+ [NF_ARP] = "arp", -+ }; -+ struct xt_match *match; -+ -+ match = try_then_request_module(xt_find_match(af, name, revision), -+ "%st_%s", xt_prefix[af], name); -+ if(IS_ERR(match) || match == NULL) -+ return NULL; -+ -+ return match; -+} -+ -+/* In case it goes into mainline, let this out-of-tree package compile */ -+#define xt_request_find_match xt_request_find_match_lo -diff -urN linux-2.6.21.1.old/net/netfilter/Kconfig linux-2.6.21.1.dev/net/netfilter/Kconfig ---- linux-2.6.21.1.old/net/netfilter/Kconfig 2007-04-27 23:49:26.000000000 +0200 -+++ linux-2.6.21.1.dev/net/netfilter/Kconfig 2007-05-26 20:40:11.003183680 +0200 -@@ -287,6 +287,14 @@ - - # alphabetically ordered list of targets - -+config NETFILTER_XT_TARGET_CHAOS -+ tristate '"CHAOS" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `CHAOS' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_CLASSIFY - tristate '"CLASSIFY" target support' - depends on NETFILTER_XTABLES -@@ -315,6 +323,14 @@ - <file:Documentation/modules.txt>. The module will be called - ipt_CONNMARK.o. If unsure, say `N'. - -+config NETFILTER_XT_TARGET_DELUDE -+ tristate '"DELUDE" target support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a `DELUDE' target. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_TARGET_DSCP - tristate '"DSCP" target support' - depends on NETFILTER_XTABLES -@@ -563,6 +579,14 @@ - - To compile it as a module, choose M here. If unsure, say N. - -+config NETFILTER_XT_MATCH_PORTSCAN -+ tristate '"portscan" match support' -+ depends on NETFILTER_XTABLES -+ help -+ This option adds a 'portscan' match support. -+ -+ To compile it as a module, choose M here. If unsure, say N. -+ - config NETFILTER_XT_MATCH_MULTIPORT - tristate "Multiple port match support" - depends on NETFILTER_XTABLES -diff -urN linux-2.6.21.1.old/net/netfilter/Makefile linux-2.6.21.1.dev/net/netfilter/Makefile ---- linux-2.6.21.1.old/net/netfilter/Makefile 2007-04-27 23:49:26.000000000 +0200 -+++ linux-2.6.21.1.dev/net/netfilter/Makefile 2007-05-26 20:40:11.003183680 +0200 -@@ -37,8 +37,10 @@ - obj-$(CONFIG_NETFILTER_XTABLES) += x_tables.o xt_tcpudp.o - - # targets -+obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CLASSIFY) += xt_CLASSIFY.o - obj-$(CONFIG_NETFILTER_XT_TARGET_CONNMARK) += xt_CONNMARK.o -+obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o - obj-$(CONFIG_NETFILTER_XT_TARGET_DSCP) += xt_DSCP.o - obj-$(CONFIG_NETFILTER_XT_TARGET_MARK) += xt_MARK.o - obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE) += xt_NFQUEUE.o -@@ -63,6 +65,7 @@ - obj-$(CONFIG_NETFILTER_XT_MATCH_MARK) += xt_mark.o - obj-$(CONFIG_NETFILTER_XT_MATCH_MULTIPORT) += xt_multiport.o - obj-$(CONFIG_NETFILTER_XT_MATCH_POLICY) += xt_policy.o -+obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o - obj-$(CONFIG_NETFILTER_XT_MATCH_PKTTYPE) += xt_pkttype.o - obj-$(CONFIG_NETFILTER_XT_MATCH_QUOTA) += xt_quota.o - obj-$(CONFIG_NETFILTER_XT_MATCH_REALM) += xt_realm.o -diff -urN linux-2.6.21.1.old/net/netfilter/xt_CHAOS.c linux-2.6.21.1.dev/net/netfilter/xt_CHAOS.c ---- linux-2.6.21.1.old/net/netfilter/xt_CHAOS.c 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/net/netfilter/xt_CHAOS.c 2007-05-26 20:40:11.004183528 +0200 -@@ -0,0 +1,204 @@ -+/* -+ CHAOS target for netfilter -+ -+ Copyright © Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 -+ 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/icmp.h> -+#include <linux/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter_ipv4/ipt_REJECT.h> -+#include <net/ip.h> -+#include <linux/netfilter/xt_CHAOS.h> -+#include "find_match.c" -+#include <linux/netfilter/oot_trans.h> -+#define PFX KBUILD_MODNAME ": " -+ -+/* Module parameters */ -+static unsigned int reject_percentage = ~0U * .01; -+static unsigned int delude_percentage = ~0U * .0101; -+module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); -+module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); -+ -+/* References to other matches/targets */ -+static struct xt_match *xm_tcp; -+static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; -+ -+static int have_delude, have_tarpit; -+ -+/* Static data for other matches/targets */ -+static const struct ipt_reject_info reject_params = { -+ .with = ICMP_HOST_UNREACH, -+}; -+ -+static const struct xt_tcp tcp_params = { -+ .spts = {0, ~0}, -+ .dpts = {0, ~0}, -+}; -+ -+/* CHAOS functions */ -+static void xt_chaos_total(const struct xt_chaos_info *info, -+ struct sk_buff **pskb, const struct net_device *in, -+ const struct net_device *out, unsigned int hooknum) -+{ -+ const int protoff = 4 * (*pskb)->nh.iph->ihl; -+ const int offset = ntohs((*pskb)->nh.iph->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ int hotdrop = 0, ret; -+ -+ ret = xm_tcp->match(*pskb, in, out, xm_tcp, &tcp_params, -+ offset, protoff, &hotdrop); -+ if(!ret || hotdrop || (unsigned int)net_random() > delude_percentage) -+ return; -+ -+ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; -+#ifdef HAVE_TARGUSERINFO -+ destiny->target(pskb, in, out, hooknum, destiny, NULL, NULL); -+#else -+ destiny->target(pskb, in, out, hooknum, destiny, NULL); -+#endif -+ return; -+} -+ -+static unsigned int xt_chaos_target(struct sk_buff **pskb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo -+#ifdef HAVE_TARGUSERINFO -+ , -+ void *userinfo -+#endif -+ ) -+{ -+ /* Equivalent to: -+ * -A chaos -m statistic --mode random --probability \ -+ * $reject_percentage -j REJECT --reject-with host-unreach; -+ * -A chaos -p tcp -m statistic --mode random --probability \ -+ * $delude_percentage -j DELUDE; -+ * -A chaos -j DROP; -+ */ -+ const struct xt_chaos_info *info = targinfo; -+ -+ if((unsigned int)net_random() <= reject_percentage) -+#ifdef HAVE_TARGUSERINFO -+ return xt_reject->target(pskb, in, out, hooknum, target, -+ &reject_params, userinfo); -+#else -+ return xt_reject->target(pskb, in, out, hooknum, target, -+ &reject_params); -+#endif -+ -+ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ -+ if((*pskb)->nh.iph->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_IP_LOCAL_OUT) -+ xt_chaos_total(info, pskb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static int xt_chaos_checkentry(const char *tablename, const void *entry, -+ const struct xt_target *target, void *targinfo, -+#ifdef HAVE_TARGINFOSIZE -+ unsigned int targinfosize, -+#endif -+ unsigned int hook_mask) -+{ -+ const struct xt_chaos_info *info = targinfo; -+ if(info->variant == XTCHAOS_DELUDE && !have_delude) { -+ printk(KERN_WARNING PFX "Error: Cannot use --delude when " -+ "DELUDE module not available\n"); -+ return 0; -+ } -+ if(info->variant == XTCHAOS_TARPIT && !have_tarpit) { -+ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " -+ "TARPIT module not available\n"); -+ return 0; -+ } -+ return 1; -+} -+ -+static struct xt_target xt_chaos_info = { -+ .name = "CHAOS", -+ .target = xt_chaos_target, -+ .checkentry = xt_chaos_checkentry, -+ .table = "filter", -+ .targetsize = sizeof(struct xt_chaos_info), -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | -+ (1 << NF_IP_LOCAL_OUT), -+ .family = AF_INET, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_chaos_init(void) -+{ -+ int ret = -EINVAL; -+ -+ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); -+ if(xm_tcp == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"tcp\" match\n"); -+ return -EINVAL; -+ } -+ -+ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); -+ if(xt_reject == NULL) { -+ printk(KERN_WARNING PFX "Error: Could not find or load " -+ "\"REJECT\" target\n"); -+ goto out2; -+ } -+ -+ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); -+ have_tarpit = xt_tarpit != NULL; -+ if(!have_tarpit) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"TARPIT\" target\n"); -+ -+ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); -+ have_delude = xt_delude != NULL; -+ if(!have_delude) -+ printk(KERN_WARNING PFX "Warning: Could not find or load " -+ "\"DELUDE\" target\n"); -+ -+ if((ret = xt_register_target(&xt_chaos_info)) != 0) { -+ printk(KERN_WARNING PFX "xt_register_target returned " -+ "error %d\n", ret); -+ goto out3; -+ } -+ -+ return 0; -+ -+ out3: -+ if(have_delude) -+ module_put(xt_delude->me); -+ if(have_tarpit) -+ module_put(xt_tarpit->me); -+ module_put(xt_reject->me); -+ out2: -+ module_put(xm_tcp->me); -+ return ret; -+} -+ -+static void __exit xt_chaos_exit(void) -+{ -+ xt_unregister_target(&xt_chaos_info); -+ module_put(xm_tcp->me); -+ module_put(xt_reject->me); -+ if(have_delude) -+ module_put(xt_delude->me); -+ if(have_tarpit) -+ module_put(xt_tarpit->me); -+ return; -+} -+ -+module_init(xt_chaos_init); -+module_exit(xt_chaos_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_DESCRIPTION("netfilter CHAOS target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); -diff -urN linux-2.6.21.1.old/net/netfilter/xt_DELUDE.c linux-2.6.21.1.dev/net/netfilter/xt_DELUDE.c ---- linux-2.6.21.1.old/net/netfilter/xt_DELUDE.c 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/net/netfilter/xt_DELUDE.c 2007-05-26 20:40:11.004183528 +0200 -@@ -0,0 +1,288 @@ -+/* -+ DELUDE target -+ Copyright © Jan Engelhardt <jengelh [at] gmx de>, 2007 -+ -+ Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: -+ (C) 1999-2001 Paul `Rusty' Russell -+ (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> -+ -+ xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. -+ -+ 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/module.h> -+#include <linux/skbuff.h> -+#include <linux/ip.h> -+#include <linux/random.h> -+#include <linux/tcp.h> -+#include <linux/udp.h> -+#include <linux/icmp.h> -+#include <net/icmp.h> -+#include <net/ip.h> -+#include <net/tcp.h> -+#include <net/route.h> -+#include <net/dst.h> -+#include <linux/netfilter_ipv4/ip_tables.h> -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include <linux/netfilter_bridge.h> -+#endif -+#include <linux/netfilter/oot_trans.h> -+#define PFX KBUILD_MODNAME ": " -+ -+static inline struct rtable *route_reverse(struct sk_buff *skb, -+ struct tcphdr *tcph, int hook) -+{ -+ struct iphdr *iph = skb->nh.iph; -+ struct dst_entry *odst; -+ struct flowi fl = {}; -+ struct rtable *rt; -+ -+ /* We don't require ip forwarding to be enabled to be able to -+ * send a RST reply for bridged traffic. */ -+ if (hook != NF_IP_FORWARD -+#ifdef CONFIG_BRIDGE_NETFILTER -+ || (skb->nf_bridge && skb->nf_bridge->mask & BRNF_BRIDGED) -+#endif -+ ) { -+ fl.nl_u.ip4_u.daddr = iph->saddr; -+ if (hook == NF_IP_LOCAL_IN) -+ fl.nl_u.ip4_u.saddr = iph->daddr; -+ fl.nl_u.ip4_u.tos = RT_TOS(iph->tos); -+ -+ if (ip_route_output_key(&rt, &fl) != 0) -+ return NULL; -+ } else { -+ /* non-local src, find valid iif to satisfy -+ * rp-filter when calling ip_route_input. */ -+ fl.nl_u.ip4_u.daddr = iph->daddr; -+ if (ip_route_output_key(&rt, &fl) != 0) -+ return NULL; -+ -+ odst = skb->dst; -+ if (ip_route_input(skb, iph->saddr, iph->daddr, -+ RT_TOS(iph->tos), rt->u.dst.dev) != 0) { -+ dst_release(&rt->u.dst); -+ return NULL; -+ } -+ dst_release(&rt->u.dst); -+ rt = (struct rtable *)skb->dst; -+ skb->dst = odst; -+ -+ fl.nl_u.ip4_u.daddr = iph->saddr; -+ fl.nl_u.ip4_u.saddr = iph->daddr; -+ fl.nl_u.ip4_u.tos = RT_TOS(iph->tos); -+ } -+ -+ if (rt->u.dst.error) { -+ dst_release(&rt->u.dst); -+ return NULL; -+ } -+ -+ fl.proto = IPPROTO_TCP; -+ fl.fl_ip_sport = tcph->dest; -+ fl.fl_ip_dport = tcph->source; -+ -+ xfrm_lookup((struct dst_entry **)&rt, &fl, NULL, 0); -+ -+ return rt; -+} -+ -+static void send_reset(struct sk_buff *oldskb, int hook) -+{ -+ struct sk_buff *nskb; -+ struct iphdr *iph = oldskb->nh.iph; -+ struct tcphdr _otcph, *oth, *tcph; -+ __be16 tmp_port; -+ __be32 tmp_addr; -+ int needs_ack; -+ unsigned int addr_type; -+ -+ /* IP header checks: fragment. */ -+ if (oldskb->nh.iph->frag_off & htons(IP_OFFSET)) -+ return; -+ -+ oth = skb_header_pointer(oldskb, oldskb->nh.iph->ihl * 4, -+ sizeof(_otcph), &_otcph); -+ if (oth == NULL) -+ return; -+ -+ /* No RST for RST. */ -+ if (oth->rst) -+ return; -+ -+ /* Check checksum */ -+ if (nf_ip_checksum(oldskb, hook, iph->ihl * 4, IPPROTO_TCP)) -+ return; -+ -+ /* We need a linear, writeable skb. We also need to expand -+ headroom in case hh_len of incoming interface < hh_len of -+ outgoing interface */ -+ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), -+ GFP_ATOMIC); -+ if (!nskb) -+ return; -+ -+ /* This packet will not be the same as the other: clear nf fields */ -+ nf_reset(nskb); -+ nskb->nfmark = 0; -+ skb_init_secmark(nskb); -+ -+ skb_shinfo(nskb)->gso_size = 0; -+ skb_shinfo(nskb)->gso_segs = 0; -+ skb_shinfo(nskb)->gso_type = 0; -+ -+ tcph = (struct tcphdr *)((u_int32_t*)nskb->nh.iph + nskb->nh.iph->ihl); -+ -+ /* Swap source and dest */ -+ tmp_addr = nskb->nh.iph->saddr; -+ nskb->nh.iph->saddr = nskb->nh.iph->daddr; -+ nskb->nh.iph->daddr = tmp_addr; -+ tmp_port = tcph->source; -+ tcph->source = tcph->dest; -+ tcph->dest = tmp_port; -+ -+ /* Truncate to length (no data) */ -+ tcph->doff = sizeof(struct tcphdr)/4; -+ skb_trim(nskb, nskb->nh.iph->ihl*4 + sizeof(struct tcphdr)); -+ nskb->nh.iph->tot_len = htons(nskb->len); -+ -+ if(oth->syn && !oth->ack && !oth->rst && !oth->fin) { -+ /* DELUDE essential part */ -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + -+ oldskb->len - oldskb->nh.iph->ihl * 4 - -+ (oth->doff << 2)); -+ tcph->seq = htonl(secure_tcp_sequence_number( -+ nskb->nh.iph->saddr, nskb->nh.iph->daddr, -+ tcph->source, tcph->dest)); -+ tcph->ack = 1; -+ } else { -+ if(!tcph->ack) { -+ needs_ack = 1; -+ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin -+ + oldskb->len - oldskb->nh.iph->ihl*4 -+ - (oth->doff<<2)); -+ tcph->seq = 0; -+ } else { -+ needs_ack = 0; -+ tcph->seq = oth->ack_seq; -+ tcph->ack_seq = 0; -+ } -+ -+ /* Reset flags */ -+ ((u_int8_t *)tcph)[13] = 0; -+ tcph->rst = 1; -+ tcph->ack = needs_ack; -+ } -+ -+ -+ tcph->window = 0; -+ tcph->urg_ptr = 0; -+ -+ /* Adjust TCP checksum */ -+ tcph->check = 0; -+ tcph->check = tcp_v4_check(tcph, sizeof(struct tcphdr), -+ nskb->nh.iph->saddr, -+ nskb->nh.iph->daddr, -+ csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ nskb->nh.iph->frag_off = htons(IP_DF); -+ nskb->nh.iph->id = 0; -+ -+ addr_type = RTN_UNSPEC; -+ if (hook != NF_IP_FORWARD -+#ifdef CONFIG_BRIDGE_NETFILTER -+ || (nskb->nf_bridge && nskb->nf_bridge->mask & BRNF_BRIDGED) -+#endif -+ ) -+ addr_type = RTN_LOCAL; -+ -+ if (ip_route_me_harder(&nskb, addr_type)) -+ goto free_nskb; -+ -+ nskb->ip_summed = CHECKSUM_NONE; -+ -+ /* Adjust IP TTL */ -+ nskb->nh.iph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ nskb->nh.iph->check = 0; -+ nskb->nh.iph->check = ip_fast_csum((unsigned char *)nskb->nh.iph, -+ nskb->nh.iph->ihl); -+ -+ /* "Never happens" */ -+ if (nskb->len > dst_mtu(nskb->dst)) -+ goto free_nskb; -+ -+ nf_ct_attach(nskb, oldskb); -+ -+ NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev, -+ dst_output); -+ return; -+ -+ free_nskb: -+ kfree_skb(nskb); -+} -+ -+static unsigned int xt_delude_target(struct sk_buff **pskb, -+ const struct net_device *in, const struct net_device *out, -+ unsigned int hooknum, const struct xt_target *target, const void *targinfo -+#ifdef HAVE_TARGUSERINFO -+ , -+ void *userinfo -+#endif -+ ) -+{ -+ /* WARNING: This code causes reentry within iptables. -+ This means that the iptables jump stack is now crap. We -+ must return an absolute verdict. --RR */ -+ send_reset(*pskb, hooknum); -+ return NF_DROP; -+} -+ -+static int xt_delude_check(const char *tablename, const void *e_void, -+ const struct xt_target *target, void *targinfo, -+#ifdef HAVE_TARGINFOSIZE -+ unsigned int targinfosize, -+#endif -+ unsigned int hook_mask) -+{ -+ if(hook_mask & ~((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD))) { -+ printk(KERN_WARNING PFX "DELUDE may not be used in chains " -+ "other than INPUT and FORWARD\n"); -+ return 0; -+ } -+ return 1; -+} -+ -+static struct xt_target xt_delude_info = { -+ .name = "DELUDE", -+ .target = xt_delude_target, -+ .checkentry = xt_delude_check, -+ .table = "filter", -+ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | -+ (1 << NF_IP_LOCAL_OUT), -+ .proto = IPPROTO_TCP, -+ .family = AF_INET, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_delude_init(void) -+{ -+ return xt_register_target(&xt_delude_info); -+} -+ -+static void __exit xt_delude_exit(void) -+{ -+ xt_unregister_target(&xt_delude_info); -+} -+ -+module_init(xt_delude_init); -+module_exit(xt_delude_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_DESCRIPTION("netfilter DELUDE target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); -diff -urN linux-2.6.21.1.old/net/netfilter/xt_portscan.c linux-2.6.21.1.dev/net/netfilter/xt_portscan.c ---- linux-2.6.21.1.old/net/netfilter/xt_portscan.c 1970-01-01 01:00:00.000000000 +0100 -+++ linux-2.6.21.1.dev/net/netfilter/xt_portscan.c 2007-05-26 20:40:11.004183528 +0200 -@@ -0,0 +1,272 @@ -+/* -+ portscan match for netfilter -+ -+ Written by Jan Engelhardt, 2006 - 2007 -+ 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/in.h> -+#include <linux/ip.h> -+#include <linux/module.h> -+#include <linux/moduleparam.h> -+#include <linux/skbuff.h> -+#include <linux/stat.h> -+#include <linux/tcp.h> -+#include <linux/types.h> -+#include <linux/version.h> -+#include <linux/netfilter/x_tables.h> -+#include <linux/netfilter/xt_tcpudp.h> -+#include <linux/netfilter/oot_conntrack.h> -+#include <linux/netfilter/xt_portscan.h> -+#include <linux/netfilter/oot_trans.h> -+#define PFX KBUILD_MODNAME ": " -+ -+enum { -+ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, -+ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, -+ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, -+}; -+ -+/* Module parameters */ -+static unsigned int -+ connmark_mask = ~0, -+ packet_mask = ~0, -+ mark_seen = 0x9, -+ mark_synrcv = 0x1, -+ mark_closed = 0x2, -+ mark_synscan = 0x3, -+ mark_estab1 = 0x4, -+ mark_estab2 = 0x5, -+ mark_cnscan = 0x6, -+ mark_grscan = 0x7, -+ mark_valid = 0x8; -+ -+module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); -+module_param(packet_mask, uint, S_IRUGO | S_IWUSR); -+module_param(mark_seen, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); -+module_param(mark_closed, uint, S_IRUGO | S_IWUSR); -+module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); -+module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); -+module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); -+module_param(mark_valid, uint, S_IRUGO | S_IWUSR); -+MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); -+MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); -+MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); -+MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); -+MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); -+MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); -+MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); -+MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); -+MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); -+MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); -+MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); -+ -+/* TCP flag functions */ -+static inline int tflg_ack4(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; -+} -+ -+static inline int tflg_ack6(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; -+} -+ -+static inline int tflg_fin(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; -+} -+ -+static inline int tflg_rst(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; -+} -+ -+static inline int tflg_rstack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_ACK | TCP_FLAG_RST); -+} -+ -+static inline int tflg_syn(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; -+} -+ -+static inline int tflg_synack(const struct tcphdr *th) -+{ -+ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == -+ (TCP_FLAG_SYN | TCP_FLAG_ACK); -+} -+ -+/* portscan functions */ -+static inline int xt_portscan_stealth(const struct tcphdr *th) -+{ -+ /* -+ * "Connection refused" replies to our own probes must not be matched. -+ */ -+ if(tflg_rstack(th)) -+ return 0; -+ -+ if(tflg_rst(th) && printk_ratelimit()) { -+ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); -+ return 0; -+ } -+ -+ /* -+ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start -+ * packets that are not associated with any connection -- this will -+ * match most scan types (NULL, XMAS, FIN) and ridiculous flag -+ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). -+ */ -+ return !tflg_syn(th); -+} -+ -+static inline int xt_portscan_full(int mark, enum ip_conntrack_info ctstate, -+ int loopback, const struct tcphdr *tcph, int payload_len) -+{ -+ if(mark == mark_estab2) { -+ /* -+ * -m connmark --mark $ESTAB2 -+ */ -+ if(tflg_ack4(tcph) && payload_len == 0) -+ return mark; /* keep mark */ -+ else if(tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_grscan; -+ else -+ return mark_valid; -+ } else if(mark == mark_estab1) { -+ /* -+ * -m connmark --mark $ESTAB1 -+ */ -+ if(tflg_rst(tcph) || tflg_fin(tcph)) -+ return mark_cnscan; -+ else if(!loopback && tflg_ack4(tcph) && payload_len == 0) -+ return mark_estab2; -+ else -+ return mark_valid; -+ } else if(mark == mark_synrcv) { -+ /* -+ * -m connmark --mark $SYN -+ */ -+ if(loopback && tflg_synack(tcph)) -+ return mark; /* keep mark */ -+ else if(loopback && tflg_rstack(tcph)) -+ return mark_closed; -+ else if(tflg_ack6(tcph)) -+ return mark_estab1; -+ else -+ return mark_synscan; -+ } else if(ctstate == IP_CT_NEW && tflg_syn(tcph)) { -+ /* -+ * -p tcp --syn --ctstate NEW -+ */ -+ return mark_synrcv; -+ } -+ return mark; -+} -+ -+static int xt_portscan_match(const struct sk_buff *skb, -+ const struct net_device *in, const struct net_device *out, -+ const struct xt_match *match, const void *matchinfo, int offset, -+ unsigned int protoff, int *hotdrop) -+{ -+ const struct xt_portscan_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ struct ip_conntrack *ctdata; -+ const struct tcphdr *tcph; -+ struct tcphdr tcph_buf; -+ -+ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); -+ if(tcph == NULL) -+ return 0; -+ -+ /* Check for invalid packets: -m conntrack --ctstate INVALID */ -+ if((ctdata = ip_conntrack_get(skb, &ctstate)) == NULL) { -+ if(info->match_stealth) -+ return xt_portscan_stealth(tcph); -+ /* -+ * If @ctdata is NULL, we cannot match the other scan -+ * types, return. -+ */ -+ return 0; -+ } -+ -+ /* -+ * If -m portscan was previously applied to this packet, the rules we -+ * simulate must not be run through again. And for speedup, do not call -+ * it either when the connection is already VALID. -+ */ -+ if((ctdata->mark & connmark_mask) == mark_valid || -+ (skb->nfmark & packet_mask) != mark_seen) -+ { -+ unsigned int n; -+ n = xt_portscan_full(ctdata->mark & connmark_mask, ctstate, -+ in == &loopback_dev, tcph, -+ skb->len - protoff - 4 * tcph->doff); -+ -+ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; -+ ((struct sk_buff *)skb)->nfmark = -+ (skb->nfmark & ~packet_mask) | mark_seen; -+ } -+ -+ return (info->match_syn && ctdata->mark == mark_synscan) || -+ (info->match_cn && ctdata->mark == mark_cnscan) || -+ (info->match_gr && ctdata->mark == mark_grscan); -+} -+ -+static int xt_portscan_checkentry(const char *tablename, const void *entry, -+ const struct xt_match *match, void *matchinfo, -+#ifdef HAVE_MATCHINFOSIZE -+ unsigned int matchinfosize, -+#endif -+ unsigned int hook_mask) -+{ -+ const struct xt_portscan_info *info = matchinfo; -+#ifdef HAVE_MATCHINFOSIZE -+ if(matchinfosize != XT_ALIGN(sizeof(struct xt_portscan_info))) { -+ printk(KERN_WARNING PFX "matchinfosize %u != %Zu\n", -+ matchinfosize, -+ XT_ALIGN(sizeof(struct xt_portscan_info))); -+ return 0; -+ } -+#endif -+ if((info->match_stealth & ~1) || (info->match_syn & ~1) || -+ (info->match_cn & ~1) || (info->match_gr & ~1)) { -+ printk(KERN_WARNING PFX "Invalid flags\n"); -+ return 0; -+ } -+ return 1; -+} -+ -+static struct xt_match xt_portscan = { -+ .name = "portscan", -+ .match = xt_portscan_match, -+ .checkentry = xt_portscan_checkentry, -+ .matchsize = sizeof(struct xt_portscan_info), -+ .proto = IPPROTO_TCP, -+ .family = AF_INET, -+ .me = THIS_MODULE, -+}; -+ -+static int __init xt_portscan_init(void) -+{ -+ return xt_register_match(&xt_portscan); -+} -+ -+static void __exit xt_portscan_exit(void) -+{ -+ xt_unregister_match(&xt_portscan); -+ return; -+} -+ -+module_init(xt_portscan_init); -+module_exit(xt_portscan_exit); -+MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); -+MODULE_DESCRIPTION("netfilter portscan match module"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); diff --git a/target/linux/generic-2.6/patches/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches/170-netfilter_chaostables_0.8.patch new file mode 100644 index 0000000000..063bcf1e64 --- /dev/null +++ b/target/linux/generic-2.6/patches/170-netfilter_chaostables_0.8.patch @@ -0,0 +1,853 @@ +Index: linux-2.6.21.7/include/linux/netfilter/oot_conntrack.h +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/include/linux/netfilter/oot_conntrack.h +@@ -0,0 +1,5 @@ ++#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) ++# include <linux/netfilter_ipv4/ip_conntrack.h> ++#else /* linux-2.6.20+ */ ++# include <net/netfilter/nf_nat_rule.h> ++#endif +Index: linux-2.6.21.7/include/linux/netfilter/oot_trans.h +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/include/linux/netfilter/oot_trans.h +@@ -0,0 +1,14 @@ ++/* Out of tree workarounds */ ++#include <linux/version.h> ++#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18) ++# define HAVE_MATCHINFOSIZE 1 ++# define HAVE_TARGUSERINFO 1 ++# define HAVE_TARGINFOSIZE 1 ++#endif ++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) ++# define nfmark mark ++#endif ++#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 21) ++# define tcp_v4_check(tcph, tcph_sz, s, d, csp) \ ++ tcp_v4_check((tcph_sz), (s), (d), (csp)) ++#endif +Index: linux-2.6.21.7/include/linux/netfilter/xt_CHAOS.h +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/include/linux/netfilter/xt_CHAOS.h +@@ -0,0 +1,14 @@ ++#ifndef _LINUX_NETFILTER_XT_CHAOS_H ++#define _LINUX_NETFILTER_XT_CHAOS_H 1 ++ ++enum xt_chaos_target_variant { ++ XTCHAOS_NORMAL, ++ XTCHAOS_TARPIT, ++ XTCHAOS_DELUDE, ++}; ++ ++struct xt_chaos_target_info { ++ uint8_t variant; ++}; ++ ++#endif /* _LINUX_NETFILTER_XT_CHAOS_H */ +Index: linux-2.6.21.7/include/linux/netfilter/xt_portscan.h +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/include/linux/netfilter/xt_portscan.h +@@ -0,0 +1,8 @@ ++#ifndef _LINUX_NETFILTER_XT_PORTSCAN_H ++#define _LINUX_NETFILTER_XT_PORTSCAN_H 1 ++ ++struct xt_portscan_match_info { ++ uint8_t match_stealth, match_syn, match_cn, match_gr; ++}; ++ ++#endif /* _LINUX_NETFILTER_XT_PORTSCAN_H */ +Index: linux-2.6.21.7/net/netfilter/find_match.c +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/find_match.c +@@ -0,0 +1,39 @@ ++/* ++ xt_request_find_match ++ by Jan Engelhardt <jengelh [at] gmx de>, 2006 - 2007 ++ ++ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: ++ Copyright (C) 2006-2006 Harald Welte <laforge@netfilter.org> ++ 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/err.h> ++#include <linux/netfilter_arp.h> ++#include <linux/socket.h> ++#include <linux/netfilter/x_tables.h> ++ ++/* ++ * Yeah this code is sub-optimal, but the function is missing in ++ * mainline so far. -jengelh ++ */ ++static struct xt_match *xt_request_find_match_lo(int af, const char *name, ++ u8 revision) ++{ ++ static const char *const xt_prefix[] = { ++ [AF_INET] = "ip", ++ [AF_INET6] = "ip6", ++ [NF_ARP] = "arp", ++ }; ++ struct xt_match *match; ++ ++ match = try_then_request_module(xt_find_match(af, name, revision), ++ "%st_%s", xt_prefix[af], name); ++ if (IS_ERR(match) || match == NULL) ++ return NULL; ++ ++ return match; ++} ++ ++/* In case it goes into mainline, let this out-of-tree package compile */ ++#define xt_request_find_match xt_request_find_match_lo +Index: linux-2.6.21.7/net/netfilter/Kconfig +=================================================================== +--- linux-2.6.21.7.orig/net/netfilter/Kconfig ++++ linux-2.6.21.7/net/netfilter/Kconfig +@@ -287,6 +287,14 @@ config NETFILTER_XTABLES + + # alphabetically ordered list of targets + ++config NETFILTER_XT_TARGET_CHAOS ++ tristate '"CHAOS" target support' ++ depends on NETFILTER_XTABLES ++ help ++ This option adds a `CHAOS' target. ++ ++ To compile it as a module, choose M here. If unsure, say N. ++ + config NETFILTER_XT_TARGET_CLASSIFY + tristate '"CLASSIFY" target support' + depends on NETFILTER_XTABLES +@@ -315,6 +323,14 @@ config NETFILTER_XT_TARGET_CONNMARK + <file:Documentation/modules.txt>. The module will be called + ipt_CONNMARK.o. If unsure, say `N'. + ++config NETFILTER_XT_TARGET_DELUDE ++ tristate '"DELUDE" target support' ++ depends on NETFILTER_XTABLES ++ help ++ This option adds a `DELUDE' target. ++ ++ To compile it as a module, choose M here. If unsure, say N. ++ + config NETFILTER_XT_TARGET_DSCP + tristate '"DSCP" target support' + depends on NETFILTER_XTABLES +@@ -563,6 +579,14 @@ config NETFILTER_XT_MATCH_POLICY + + To compile it as a module, choose M here. If unsure, say N. + ++config NETFILTER_XT_MATCH_PORTSCAN ++ tristate '"portscan" match support' ++ depends on NETFILTER_XTABLES ++ help ++ This option adds a 'portscan' match support. ++ ++ To compile it as a module, choose M here. If unsure, say N. ++ + config NETFILTER_XT_MATCH_MULTIPORT + tristate "Multiple port match support" + depends on NETFILTER_XTABLES +Index: linux-2.6.21.7/net/netfilter/Makefile +=================================================================== +--- linux-2.6.21.7.orig/net/netfilter/Makefile ++++ linux-2.6.21.7/net/netfilter/Makefile +@@ -47,6 +47,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK + obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o + obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o + obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o ++obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o ++obj-$(CONFIG_NETFILTER_XT_TARGET_DELUDE) += xt_DELUDE.o + + # matches + obj-$(CONFIG_NETFILTER_XT_MATCH_COMMENT) += xt_comment.o +@@ -74,3 +76,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_STRING) + obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) += xt_tcpmss.o + obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o + obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o ++obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o +Index: linux-2.6.21.7/net/netfilter/xt_CHAOS.c +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/xt_CHAOS.c +@@ -0,0 +1,200 @@ ++/* ++ * CHAOS target for netfilter ++ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 ++ * Contact: Jan Engelhardt <jengelh@computergmbh.de> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License; either version ++ * 2 or 3 as published by the Free Software Foundation. ++ */ ++#include <linux/icmp.h> ++#include <linux/in.h> ++#include <linux/ip.h> ++#include <linux/module.h> ++#include <linux/skbuff.h> ++#include <linux/stat.h> ++#include <linux/netfilter/x_tables.h> ++#include <linux/netfilter/xt_tcpudp.h> ++#include <linux/netfilter_ipv4/ipt_REJECT.h> ++#include <net/ip.h> ++#if defined(_LOCAL) ++# include "xt_CHAOS.h" ++# include "find_match.c" ++#elif defined(CONFIG_NETFILTER_XT_TARGET_CHAOS) || \ ++ defined(CONFIG_NETFILTER_XT_TARGET_CHAOS_MODULE) ++# include <linux/netfilter/xt_CHAOS.h> ++# include "find_match.c" ++#else ++# include "xt_CHAOS.h" ++# include "find_match.c" ++#endif ++#define PFX KBUILD_MODNAME ": " ++ ++/* Module parameters */ ++static unsigned int reject_percentage = ~0U * .01; ++static unsigned int delude_percentage = ~0U * .0101; ++module_param(reject_percentage, uint, S_IRUGO | S_IWUSR); ++module_param(delude_percentage, uint, S_IRUGO | S_IWUSR); ++ ++/* References to other matches/targets */ ++static struct xt_match *xm_tcp; ++static struct xt_target *xt_delude, *xt_reject, *xt_tarpit; ++ ++static int have_delude, have_tarpit; ++ ++/* Static data for other matches/targets */ ++static const struct ipt_reject_info reject_params = { ++ .with = ICMP_HOST_UNREACH, ++}; ++ ++static const struct xt_tcp tcp_params = { ++ .spts = {0, ~0}, ++ .dpts = {0, ~0}, ++}; ++ ++/* CHAOS functions */ ++static void xt_chaos_total(const struct xt_chaos_target_info *info, ++ struct sk_buff **pskb, const struct net_device *in, ++ const struct net_device *out, unsigned int hooknum) ++{ ++ const struct iphdr *iph = ip_hdr(*pskb); ++ const int protoff = 4 * iph->ihl; ++ const int offset = ntohs(iph->frag_off) & IP_OFFSET; ++ const struct xt_target *destiny; ++ int hotdrop = 0, ret; ++ ++ ret = xm_tcp->match(*pskb, in, out, xm_tcp, &tcp_params, ++ offset, protoff, &hotdrop); ++ if (!ret || hotdrop || (unsigned int)net_random() > delude_percentage) ++ return; ++ ++ destiny = (info->variant == XTCHAOS_TARPIT) ? xt_tarpit : xt_delude; ++ destiny->target(pskb, in, out, hooknum, destiny, NULL); ++ return; ++} ++ ++static unsigned int chaos_tg(struct sk_buff **pskb, ++ const struct net_device *in, const struct net_device *out, ++ unsigned int hooknum, const struct xt_target *target, const void *targinfo) ++{ ++ /* ++ * Equivalent to: ++ * -A chaos -m statistic --mode random --probability \ ++ * $reject_percentage -j REJECT --reject-with host-unreach; ++ * -A chaos -p tcp -m statistic --mode random --probability \ ++ * $delude_percentage -j DELUDE; ++ * -A chaos -j DROP; ++ */ ++ const struct xt_chaos_target_info *info = targinfo; ++ const struct iphdr *iph = ip_hdr(*pskb); ++ ++ if ((unsigned int)net_random() <= reject_percentage) ++ return xt_reject->target(pskb, in, out, hooknum, target, ++ &reject_params); ++ ++ /* TARPIT/DELUDE may not be called from the OUTPUT chain */ ++ if (iph->protocol == IPPROTO_TCP && ++ info->variant != XTCHAOS_NORMAL && hooknum != NF_IP_LOCAL_OUT) ++ xt_chaos_total(info, pskb, in, out, hooknum); ++ ++ return NF_DROP; ++} ++ ++static int chaos_tg_check(const char *tablename, const void *entry, ++ const struct xt_target *target, void *targinfo, unsigned int hook_mask) ++{ ++ const struct xt_chaos_target_info *info = targinfo; ++ ++ if (info->variant == XTCHAOS_DELUDE && !have_delude) { ++ printk(KERN_WARNING PFX "Error: Cannot use --delude when " ++ "DELUDE module not available\n"); ++ return false; ++ } ++ if (info->variant == XTCHAOS_TARPIT && !have_tarpit) { ++ printk(KERN_WARNING PFX "Error: Cannot use --tarpit when " ++ "TARPIT module not available\n"); ++ return false; ++ } ++ ++ return true; ++} ++ ++static struct xt_target chaos_tg_reg = { ++ .name = "CHAOS", ++ .family = AF_INET, ++ .table = "filter", ++ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD) | ++ (1 << NF_IP_LOCAL_OUT), ++ .checkentry = chaos_tg_check, ++ .target = chaos_tg, ++ .targetsize = sizeof(struct xt_chaos_target_info), ++ .me = THIS_MODULE, ++}; ++ ++static int __init chaos_tg_init(void) ++{ ++ int ret = -EINVAL; ++ ++ xm_tcp = xt_request_find_match(AF_INET, "tcp", 0); ++ if (xm_tcp == NULL) { ++ printk(KERN_WARNING PFX "Error: Could not find or load " ++ "\"tcp\" match\n"); ++ return -EINVAL; ++ } ++ ++ xt_reject = xt_request_find_target(AF_INET, "REJECT", 0); ++ if (xt_reject == NULL) { ++ printk(KERN_WARNING PFX "Error: Could not find or load " ++ "\"REJECT\" target\n"); ++ goto out2; ++ } ++ ++ xt_tarpit = xt_request_find_target(AF_INET, "TARPIT", 0); ++ have_tarpit = xt_tarpit != NULL; ++ if (!have_tarpit) ++ printk(KERN_WARNING PFX "Warning: Could not find or load " ++ "\"TARPIT\" target\n"); ++ ++ xt_delude = xt_request_find_target(AF_INET, "DELUDE", 0); ++ have_delude = xt_delude != NULL; ++ if (!have_delude) ++ printk(KERN_WARNING PFX "Warning: Could not find or load " ++ "\"DELUDE\" target\n"); ++ ++ if ((ret = xt_register_target(&chaos_tg_reg)) != 0) { ++ printk(KERN_WARNING PFX "xt_register_target returned " ++ "error %d\n", ret); ++ goto out3; ++ } ++ ++ return 0; ++ ++ out3: ++ if (have_delude) ++ module_put(xt_delude->me); ++ if (have_tarpit) ++ module_put(xt_tarpit->me); ++ module_put(xt_reject->me); ++ out2: ++ module_put(xm_tcp->me); ++ return ret; ++} ++ ++static void __exit chaos_tg_exit(void) ++{ ++ xt_unregister_target(&chaos_tg_reg); ++ module_put(xm_tcp->me); ++ module_put(xt_reject->me); ++ if (have_delude) ++ module_put(xt_delude->me); ++ if (have_tarpit) ++ module_put(xt_tarpit->me); ++ return; ++} ++ ++module_init(chaos_tg_init); ++module_exit(chaos_tg_exit); ++MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); ++MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_CHAOS"); +Index: linux-2.6.21.7/net/netfilter/xt_DELUDE.c +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/xt_DELUDE.c +@@ -0,0 +1,197 @@ ++/* ++ * DELUDE target ++ * Copyright © CC Computer Consultants GmbH, 2007 ++ * Contact: Jan Engelhardt <jengelh@computergmbh.de> ++ * ++ * Based upon linux-2.6.18.5/net/ipv4/netfilter/ipt_REJECT.c: ++ * (C) 1999-2001 Paul `Rusty' Russell ++ * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org> ++ * ++ * xt_DELUDE acts like REJECT, but does reply with SYN-ACK on SYN. ++ * ++ * 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/module.h> ++#include <linux/skbuff.h> ++#include <linux/ip.h> ++#include <linux/tcp.h> ++#include <linux/netfilter/x_tables.h> ++#ifdef CONFIG_BRIDGE_NETFILTER ++# include <linux/netfilter_bridge.h> ++#endif ++#include <net/tcp.h> ++#define PFX KBUILD_MODNAME ": " ++ ++static void delude_send_reset(struct sk_buff *oldskb, unsigned int hook) ++{ ++ struct tcphdr _otcph, *oth, *tcph; ++ unsigned int addr_type; ++ struct sk_buff *nskb; ++ u_int16_t tmp_port; ++ u_int32_t tmp_addr; ++ struct iphdr *niph; ++ bool needs_ack; ++ ++ /* IP header checks: fragment. */ ++ if (ip_hdr(oldskb)->frag_off & htons(IP_OFFSET)) ++ return; ++ ++ oth = skb_header_pointer(oldskb, ip_hdrlen(oldskb), ++ sizeof(_otcph), &_otcph); ++ if (oth == NULL) ++ return; ++ ++ /* No RST for RST. */ ++ if (oth->rst) ++ return; ++ ++ /* Check checksum */ ++ if (nf_ip_checksum(oldskb, hook, ip_hdrlen(oldskb), IPPROTO_TCP)) ++ return; ++ ++ /* We need a linear, writeable skb. We also need to expand ++ headroom in case hh_len of incoming interface < hh_len of ++ outgoing interface */ ++ nskb = skb_copy_expand(oldskb, LL_MAX_HEADER, skb_tailroom(oldskb), ++ GFP_ATOMIC); ++ if (!nskb) ++ return; ++ ++ /* This packet will not be the same as the other: clear nf fields */ ++ nf_reset(nskb); ++ nskb->mark = 0; ++ skb_init_secmark(nskb); ++ ++ skb_shinfo(nskb)->gso_size = 0; ++ skb_shinfo(nskb)->gso_segs = 0; ++ skb_shinfo(nskb)->gso_type = 0; ++ ++ tcph = (struct tcphdr *)(skb_network_header(nskb) + ip_hdrlen(nskb)); ++ ++ /* Swap source and dest */ ++ niph = ip_hdr(nskb); ++ tmp_addr = niph->saddr; ++ niph->saddr = niph->daddr; ++ niph->daddr = tmp_addr; ++ tmp_port = tcph->source; ++ tcph->source = tcph->dest; ++ tcph->dest = tmp_port; ++ ++ /* Truncate to length (no data) */ ++ tcph->doff = sizeof(struct tcphdr) / 4; ++ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); ++ niph->tot_len = htons(nskb->len); ++ ++ if (oth->syn && !oth->ack && !oth->rst && !oth->fin) { ++ /* DELUDE essential part */ ++ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + oth->fin + ++ oldskb->len - ip_hdrlen(oldskb) - ++ (oth->doff << 2)); ++ tcph->seq = false; ++ tcph->ack = true; ++ } else { ++ if (!tcph->ack) { ++ needs_ack = true; ++ tcph->ack_seq = htonl(ntohl(oth->seq) + oth->syn + ++ oth->fin + oldskb->len - ++ ip_hdrlen(oldskb) - (oth->doff<<2)); ++ tcph->seq = false; ++ } else { ++ needs_ack = false; ++ tcph->seq = oth->ack_seq; ++ tcph->ack_seq = false; ++ } ++ ++ /* Reset flags */ ++ ((u_int8_t *)tcph)[13] = 0; ++ tcph->rst = true; ++ tcph->ack = needs_ack; ++ } ++ ++ tcph->window = 0; ++ tcph->urg_ptr = 0; ++ ++ /* Adjust TCP checksum */ ++ tcph->check = 0; ++ tcph->check = tcp_v4_check(sizeof(struct tcphdr), niph->saddr, ++ niph->daddr, csum_partial((char *)tcph, ++ sizeof(struct tcphdr), 0)); ++ ++ /* Set DF, id = 0 */ ++ niph->frag_off = htons(IP_DF); ++ niph->id = 0; ++ ++ addr_type = RTN_UNSPEC; ++#ifdef CONFIG_BRIDGE_NETFILTER ++ if (hook != NF_IP_FORWARD || (nskb->nf_bridge != NULL && ++ nskb->nf_bridge->mask & BRNF_BRIDGED)) ++#else ++ if (hook != NF_IP_FORWARD) ++#endif ++ addr_type = RTN_LOCAL; ++ ++ if (ip_route_me_harder(&nskb, addr_type)) ++ goto free_nskb; ++ ++ nskb->ip_summed = CHECKSUM_NONE; ++ ++ /* Adjust IP TTL */ ++ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); ++ ++ /* Adjust IP checksum */ ++ niph->check = 0; ++ niph->check = ip_fast_csum(skb_network_header(nskb), niph->ihl); ++ ++ /* "Never happens" */ ++ if (nskb->len > dst_mtu(nskb->dst)) ++ goto free_nskb; ++ ++ nf_ct_attach(nskb, oldskb); ++ ++ NF_HOOK(PF_INET, NF_IP_LOCAL_OUT, nskb, NULL, nskb->dst->dev, ++ dst_output); ++ return; ++ ++ free_nskb: ++ kfree_skb(nskb); ++} ++ ++static unsigned int delude_tg(struct sk_buff **pskb, ++ const struct net_device *in, const struct net_device *out, ++ unsigned int hooknum, const struct xt_target *target, const void *targinfo) ++{ ++ /* WARNING: This code causes reentry within iptables. ++ This means that the iptables jump stack is now crap. We ++ must return an absolute verdict. --RR */ ++ delude_send_reset(*pskb, hooknum); ++ return NF_DROP; ++} ++ ++static struct xt_target delude_tg_reg = { ++ .name = "DELUDE", ++ .family = AF_INET, ++ .table = "filter", ++ .hooks = (1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD), ++ .target = delude_tg, ++ .proto = IPPROTO_TCP, ++ .me = THIS_MODULE, ++}; ++ ++static int __init delude_tg_init(void) ++{ ++ return xt_register_target(&delude_tg_reg); ++} ++ ++static void __exit delude_tg_exit(void) ++{ ++ xt_unregister_target(&delude_tg_reg); ++} ++ ++module_init(delude_tg_init); ++module_exit(delude_tg_exit); ++MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); ++MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_DELUDE"); +Index: linux-2.6.21.7/net/netfilter/xt_portscan.c +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/xt_portscan.c +@@ -0,0 +1,269 @@ ++/* ++ * portscan match for netfilter ++ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 ++ * Contact: Jan Engelhardt <jengelh@computergmbh.de> ++ * ++ * This program is free software; you can redistribute it and/or modify ++ * it under the terms of the GNU General Public License; either version ++ * 2 or 3 as published by the Free Software Foundation. ++ */ ++#include <linux/in.h> ++#include <linux/ip.h> ++#include <linux/module.h> ++#include <linux/moduleparam.h> ++#include <linux/skbuff.h> ++#include <linux/stat.h> ++#include <linux/tcp.h> ++#include <linux/types.h> ++#include <linux/version.h> ++#include <linux/netfilter/x_tables.h> ++#include <linux/netfilter/xt_tcpudp.h> ++#include <net/netfilter/nf_nat_rule.h> ++#if defined(_LOCAL) ++# include "xt_portscan.h" ++#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ ++ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) ++# include <linux/netfilter/xt_portscan.h> ++#else ++# include "xt_portscan.h" ++#endif ++#define PFX KBUILD_MODNAME ": " ++ ++enum { ++ TCP_FLAGS_ALL3 = TCP_FLAG_FIN | TCP_FLAG_RST | TCP_FLAG_SYN, ++ TCP_FLAGS_ALL4 = TCP_FLAGS_ALL3 | TCP_FLAG_ACK, ++ TCP_FLAGS_ALL6 = TCP_FLAGS_ALL4 | TCP_FLAG_PSH | TCP_FLAG_URG, ++}; ++ ++/* Module parameters */ ++static unsigned int ++ connmark_mask = ~0, ++ packet_mask = ~0, ++ mark_seen = 0x9, ++ mark_synrcv = 0x1, ++ mark_closed = 0x2, ++ mark_synscan = 0x3, ++ mark_estab1 = 0x4, ++ mark_estab2 = 0x5, ++ mark_cnscan = 0x6, ++ mark_grscan = 0x7, ++ mark_valid = 0x8; ++ ++module_param(connmark_mask, uint, S_IRUGO | S_IWUSR); ++module_param(packet_mask, uint, S_IRUGO | S_IWUSR); ++module_param(mark_seen, uint, S_IRUGO | S_IWUSR); ++module_param(mark_synrcv, uint, S_IRUGO | S_IWUSR); ++module_param(mark_closed, uint, S_IRUGO | S_IWUSR); ++module_param(mark_synscan, uint, S_IRUGO | S_IWUSR); ++module_param(mark_estab1, uint, S_IRUGO | S_IWUSR); ++module_param(mark_estab2, uint, S_IRUGO | S_IWUSR); ++module_param(mark_cnscan, uint, S_IRUGO | S_IWUSR); ++module_param(mark_grscan, uint, S_IRUGO | S_IWUSR); ++module_param(mark_valid, uint, S_IRUGO | S_IWUSR); ++MODULE_PARM_DESC(connmark_mask, "only set specified bits in connection mark"); ++MODULE_PARM_DESC(packet_mask, "only set specified bits in packet mark"); ++MODULE_PARM_DESC(mark_seen, "nfmark value for packet-seen state"); ++MODULE_PARM_DESC(mark_synrcv, "connmark value for SYN Received state"); ++MODULE_PARM_DESC(mark_closed, "connmark value for closed state"); ++MODULE_PARM_DESC(mark_synscan, "connmark value for SYN Scan state"); ++MODULE_PARM_DESC(mark_estab1, "connmark value for Established-1 state"); ++MODULE_PARM_DESC(mark_estab2, "connmark value for Established-2 state"); ++MODULE_PARM_DESC(mark_cnscan, "connmark value for Connect Scan state"); ++MODULE_PARM_DESC(mark_grscan, "connmark value for Grab Scan state"); ++MODULE_PARM_DESC(mark_valid, "connmark value for Valid state"); ++ ++/* TCP flag functions */ ++static inline bool tflg_ack4(const struct tcphdr *th) ++{ ++ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_ACK; ++} ++ ++static inline bool tflg_ack6(const struct tcphdr *th) ++{ ++ return (tcp_flag_word(th) & TCP_FLAGS_ALL6) == TCP_FLAG_ACK; ++} ++ ++static inline bool tflg_fin(const struct tcphdr *th) ++{ ++ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_FIN; ++} ++ ++static inline bool tflg_rst(const struct tcphdr *th) ++{ ++ return (tcp_flag_word(th) & TCP_FLAGS_ALL3) == TCP_FLAG_RST; ++} ++ ++static inline bool tflg_rstack(const struct tcphdr *th) ++{ ++ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == ++ (TCP_FLAG_ACK | TCP_FLAG_RST); ++} ++ ++static inline bool tflg_syn(const struct tcphdr *th) ++{ ++ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == TCP_FLAG_SYN; ++} ++ ++static inline bool tflg_synack(const struct tcphdr *th) ++{ ++ return (tcp_flag_word(th) & TCP_FLAGS_ALL4) == ++ (TCP_FLAG_SYN | TCP_FLAG_ACK); ++} ++ ++/* portscan functions */ ++static inline bool portscan_mt_stealth(const struct tcphdr *th) ++{ ++ /* ++ * "Connection refused" replies to our own probes must not be matched. ++ */ ++ if (tflg_rstack(th)) ++ return false; ++ ++ if (tflg_rst(th) && printk_ratelimit()) { ++ printk(KERN_WARNING PFX "Warning: Pure RST received\n"); ++ return false; ++ } ++ ++ /* ++ * -p tcp ! --syn -m conntrack --ctstate INVALID: Looking for non-start ++ * packets that are not associated with any connection -- this will ++ * match most scan types (NULL, XMAS, FIN) and ridiculous flag ++ * combinations (SYN-RST, SYN-FIN, SYN-FIN-RST, FIN-RST, etc.). ++ */ ++ return !tflg_syn(th); ++} ++ ++static inline unsigned int portscan_mt_full(int mark, ++ enum ip_conntrack_info ctstate, bool loopback, const struct tcphdr *tcph, ++ unsigned int payload_len) ++{ ++ if (mark == mark_estab2) { ++ /* ++ * -m connmark --mark $ESTAB2 ++ */ ++ if (tflg_ack4(tcph) && payload_len == 0) ++ return mark; /* keep mark */ ++ else if (tflg_rst(tcph) || tflg_fin(tcph)) ++ return mark_grscan; ++ else ++ return mark_valid; ++ } else if (mark == mark_estab1) { ++ /* ++ * -m connmark --mark $ESTAB1 ++ */ ++ if (tflg_rst(tcph) || tflg_fin(tcph)) ++ return mark_cnscan; ++ else if (!loopback && tflg_ack4(tcph) && payload_len == 0) ++ return mark_estab2; ++ else ++ return mark_valid; ++ } else if (mark == mark_synrcv) { ++ /* ++ * -m connmark --mark $SYN ++ */ ++ if (loopback && tflg_synack(tcph)) ++ return mark; /* keep mark */ ++ else if (loopback && tflg_rstack(tcph)) ++ return mark_closed; ++ else if (tflg_ack6(tcph)) ++ return mark_estab1; ++ else ++ return mark_synscan; ++ } else if (ctstate == IP_CT_NEW && tflg_syn(tcph)) { ++ /* ++ * -p tcp --syn --ctstate NEW ++ */ ++ return mark_synrcv; ++ } ++ return mark; ++} ++ ++static int portscan_mt(const struct sk_buff *skb, ++ const struct net_device *in, const struct net_device *out, ++ const struct xt_match *match, const void *matchinfo, int offset, ++ unsigned int protoff, int *hotdrop) ++{ ++ const struct xt_portscan_match_info *info = matchinfo; ++ enum ip_conntrack_info ctstate; ++ const struct tcphdr *tcph; ++ struct nf_conn *ctdata; ++ struct tcphdr tcph_buf; ++ ++ tcph = skb_header_pointer(skb, protoff, sizeof(tcph_buf), &tcph_buf); ++ if (tcph == NULL) ++ return false; ++ ++ /* Check for invalid packets: -m conntrack --ctstate INVALID */ ++ if ((ctdata = nf_ct_get(skb, &ctstate)) == NULL) { ++ if (info->match_stealth) ++ return portscan_mt_stealth(tcph); ++ /* ++ * If @ctdata is NULL, we cannot match the other scan ++ * types, return. ++ */ ++ return false; ++ } ++ ++ /* ++ * If -m portscan was previously applied to this packet, the rules we ++ * simulate must not be run through again. And for speedup, do not call ++ * it either when the connection is already VALID. ++ */ ++ if ((ctdata->mark & connmark_mask) == mark_valid || ++ (skb->mark & packet_mask) != mark_seen) { ++ unsigned int n; ++ ++ n = portscan_mt_full(ctdata->mark & connmark_mask, ctstate, ++ in == &loopback_dev, tcph, ++ skb->len - protoff - 4 * tcph->doff); ++ ++ ctdata->mark = (ctdata->mark & ~connmark_mask) | n; ++ ((struct sk_buff *)skb)->mark = ++ (skb->mark & ~packet_mask) ^ mark_seen; ++ } ++ ++ return (info->match_syn && ctdata->mark == mark_synscan) || ++ (info->match_cn && ctdata->mark == mark_cnscan) || ++ (info->match_gr && ctdata->mark == mark_grscan); ++} ++ ++static int portscan_mt_check(const char *tablename, const void *entry, ++ const struct xt_match *match, void *matchinfo, unsigned int hook_mask) ++{ ++ const struct xt_portscan_match_info *info = matchinfo; ++ ++ if ((info->match_stealth & ~1) || (info->match_syn & ~1) || ++ (info->match_cn & ~1) || (info->match_gr & ~1)) { ++ printk(KERN_WARNING PFX "Invalid flags\n"); ++ return false; ++ } ++ return true; ++} ++ ++static struct xt_match portscan_mt_reg __read_mostly = { ++ .name = "portscan", ++ .family = AF_INET, ++ .match = portscan_mt, ++ .checkentry = portscan_mt_check, ++ .matchsize = sizeof(struct xt_portscan_match_info), ++ .proto = IPPROTO_TCP, ++ .me = THIS_MODULE, ++}; ++ ++static int __init portscan_mt_init(void) ++{ ++ return xt_register_match(&portscan_mt_reg); ++} ++ ++static void __exit portscan_mt_exit(void) ++{ ++ xt_unregister_match(&portscan_mt_reg); ++ return; ++} ++ ++module_init(portscan_mt_init); ++module_exit(portscan_mt_exit); ++MODULE_AUTHOR("Jan Engelhardt <jengelh@computergmbh.de>"); ++MODULE_DESCRIPTION("netfilter \"portscan\" match"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_portscan"); diff --git a/target/linux/generic-2.6/patches/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches/171-netfilter_tarpit.patch new file mode 100644 index 0000000000..a686bd3d6f --- /dev/null +++ b/target/linux/generic-2.6/patches/171-netfilter_tarpit.patch @@ -0,0 +1,325 @@ +Index: linux-2.6.21.7/net/netfilter/Kconfig +=================================================================== +--- linux-2.6.21.7.orig/net/netfilter/Kconfig ++++ linux-2.6.21.7/net/netfilter/Kconfig +@@ -414,6 +414,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK + + To compile it as a module, choose M here. If unsure, say N. + ++config NETFILTER_XT_TARGET_TARPIT ++ tristate '"TARPIT" target support' ++ depends on NETFILTER_XTABLES ++ ---help--- ++ Adds a TARPIT target to iptables, which captures and holds ++ incoming TCP connections using no local per-connection resources. ++ Connections are accepted, but immediately switched to the persist ++ state (0 byte window), in which the remote side stops sending data ++ and asks to continue every 60-240 seconds. Attempts to close the ++ connection are ignored, forcing the remote side to time out the ++ connection in 12-24 minutes. ++ ++ This offers similar functionality to LaBrea ++ <http://www.hackbusters.net/LaBrea/>, but does not require dedicated ++ hardware or IPs. Any TCP port that you would normally DROP or REJECT ++ can instead become a tarpit. ++ + config NETFILTER_XT_TARGET_TCPMSS + tristate '"TCPMSS" target support' + depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) +Index: linux-2.6.21.7/net/netfilter/Makefile +=================================================================== +--- linux-2.6.21.7.orig/net/netfilter/Makefile ++++ linux-2.6.21.7/net/netfilter/Makefile +@@ -45,6 +45,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFQUEUE + obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) += xt_NFLOG.o + obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o + obj-$(CONFIG_NETFILTER_XT_TARGET_SECMARK) += xt_SECMARK.o ++obj-$(CONFIG_NETFILTER_XT_TARGET_TARPIT) += xt_TARPIT.o + obj-$(CONFIG_NETFILTER_XT_TARGET_TCPMSS) += xt_TCPMSS.o + obj-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o + obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o +Index: linux-2.6.21.7/net/netfilter/xt_TARPIT.c +=================================================================== +--- /dev/null ++++ linux-2.6.21.7/net/netfilter/xt_TARPIT.c +@@ -0,0 +1,280 @@ ++/* ++ * Kernel module to capture and hold incoming TCP connections using ++ * no local per-connection resources. ++ * ++ * Based on ipt_REJECT.c and offering functionality similar to ++ * LaBrea <http://www.hackbusters.net/LaBrea/>. ++ * ++ * Copyright (c) 2002 Aaron Hopkins <tools@die.net> ++ * ++ * 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. ++ * ++ * This program is distributed in the hope that it will be useful, ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ++ * GNU General Public License for more details. ++ * ++ * You should have received a copy of the GNU General Public License ++ * along with this program; if not, write to the Free Software ++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. ++ * ++ * Goal: ++ * - Allow incoming TCP connections to be established. ++ * - Passing data should result in the connection being switched to the ++ * persist state (0 byte window), in which the remote side stops sending ++ * data and asks to continue every 60 seconds. ++ * - Attempts to shut down the connection should be ignored completely, so ++ * the remote side ends up having to time it out. ++ * ++ * This means: ++ * - Reply to TCP SYN,!ACK,!RST,!FIN with SYN-ACK, window 5 bytes ++ * - Reply to TCP SYN,ACK,!RST,!FIN with RST to prevent spoofing ++ * - Reply to TCP !SYN,!RST,!FIN with ACK, window 0 bytes, rate-limited ++ */ ++ ++#include <linux/version.h> ++#include <linux/module.h> ++#include <linux/skbuff.h> ++#include <linux/ip.h> ++#include <net/ip.h> ++#include <net/tcp.h> ++#include <net/icmp.h> ++struct in_device; ++#include <net/route.h> ++#include <linux/random.h> ++#include <linux/netfilter_ipv4/ip_tables.h> ++ ++#if 0 ++#define DEBUGP printk ++#else ++#define DEBUGP(format, args...) ++#endif ++ ++/* Stolen from ip_finish_output2 */ ++static int ip_direct_send(struct sk_buff *skb) ++{ ++ struct dst_entry *dst = skb->dst; ++ ++ if (dst->hh != NULL) ++ return neigh_hh_output(dst->hh, skb); ++ else if (dst->neighbour != NULL) ++ return dst->neighbour->output(skb); ++ ++ if (net_ratelimit()) ++ printk(KERN_DEBUG "TARPIT ip_direct_send: no header cache and no neighbor!\n"); ++ ++ kfree_skb(skb); ++ return -EINVAL; ++} ++ ++ ++/* Send reply */ ++static void tarpit_tcp(const struct sk_buff *oskb, struct rtable *ort, ++ unsigned int local) ++{ ++ struct sk_buff *nskb; ++ struct rtable *nrt; ++ struct tcphdr *otcph, *ntcph; ++ struct flowi fl = {}; ++ unsigned int otcplen; ++ u_int16_t tmp; ++ ++ const struct iphdr *oiph = ip_hdr(oskb); ++ struct iphdr *niph; ++ ++ /* A truncated TCP header is not going to be useful */ ++ if (oskb->len < ip_hdrlen(oskb) + sizeof(struct tcphdr)) ++ return; ++ ++ otcph = (void *)oiph + ip_hdrlen(oskb); ++ otcplen = oskb->len - ip_hdrlen(oskb); ++ ++ /* No replies for RST or FIN */ ++ if (otcph->rst || otcph->fin) ++ return; ++ ++ /* No reply to !SYN,!ACK. Rate-limit replies to !SYN,ACKs */ ++ if (!otcph->syn && (!otcph->ack || !xrlim_allow(&ort->u.dst, 1*HZ))) ++ return; ++ ++ /* Check checksum. */ ++ if (tcp_v4_check(otcplen, oiph->saddr, oiph->daddr, ++ csum_partial((char *)otcph, otcplen, 0)) != 0) ++ return; ++ ++ /* ++ * Copy skb (even if skb is about to be dropped, we cannot just ++ * clone it because there may be other things, such as tcpdump, ++ * interested in it) ++ */ ++ nskb = skb_copy(oskb, GFP_ATOMIC); ++ if (nskb == NULL) ++ return; ++ ++ niph = ip_hdr(nskb); ++ ++ /* This packet will not be the same as the other: clear nf fields */ ++ nf_conntrack_put(nskb->nfct); ++ nskb->nfct = NULL; ++#ifdef CONFIG_NETFILTER_DEBUG ++ nskb->nf_debug = 0; ++#endif ++ ++ ntcph = (void *)niph + ip_hdrlen(nskb); ++ ++ /* Truncate to length (no data) */ ++ ntcph->doff = sizeof(struct tcphdr)/4; ++ skb_trim(nskb, ip_hdrlen(nskb) + sizeof(struct tcphdr)); ++ niph->tot_len = htons(nskb->len); ++ ++ /* Swap source and dest */ ++ niph->daddr = xchg(&niph->saddr, niph->daddr); ++ tmp = ntcph->source; ++ ntcph->source = ntcph->dest; ++ ntcph->dest = tmp; ++ ++ /* Use supplied sequence number or make a new one */ ++ ntcph->seq = otcph->ack ? otcph->ack_seq ++ : htonl(secure_tcp_sequence_number(niph->saddr, ++ niph->daddr, ++ ntcph->source, ++ ntcph->dest)); ++ ++ /* Our SYN-ACKs must have a >0 window */ ++ ntcph->window = (otcph->syn && !otcph->ack) ? htons(5) : 0; ++ ++ ntcph->urg_ptr = 0; ++ ++ /* Reset flags */ ++ ((u_int8_t *)ntcph)[13] = 0; ++ ++ if (otcph->syn && otcph->ack) { ++ ntcph->rst = 1; ++ ntcph->ack_seq = 0; ++ } else { ++ ntcph->syn = otcph->syn; ++ ntcph->ack = 1; ++ ntcph->ack_seq = htonl(ntohl(otcph->seq) + otcph->syn); ++ } ++ ++ /* Adjust TCP checksum */ ++ ntcph->check = 0; ++ ntcph->check = tcp_v4_check(sizeof(struct tcphdr), ++ niph->saddr, ++ niph->daddr, ++ csum_partial((char *)ntcph, ++ sizeof(struct tcphdr), 0)); ++ ++ fl.nl_u.ip4_u.daddr = niph->daddr; ++ fl.nl_u.ip4_u.saddr = local ? niph->saddr : 0; ++ fl.nl_u.ip4_u.tos = RT_TOS(niph->tos) | RTO_CONN; ++ fl.oif = 0; ++ ++ if (ip_route_output_key(&nrt, &fl)) ++ goto free_nskb; ++ ++ dst_release(nskb->dst); ++ nskb->dst = &nrt->u.dst; ++ ++ /* Adjust IP TTL */ ++ niph->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); ++ ++ /* Set DF, id = 0 */ ++ niph->frag_off = htons(IP_DF); ++ niph->id = 0; ++ ++ /* Adjust IP checksum */ ++ niph->check = 0; ++ niph->check = ip_fast_csum((unsigned char *)niph, niph->ihl); ++ ++ /* "Never happens" */ ++ if (nskb->len > dst_mtu(nskb->dst)) ++ goto free_nskb; ++ ++ ip_direct_send(nskb); ++ return; ++ ++ free_nskb: ++ kfree_skb(nskb); ++} ++ ++static unsigned int xt_tarpit_target(struct sk_buff **pskb, ++ const struct net_device *in, ++ const struct net_device *out, ++ unsigned int hooknum, ++ const struct xt_target *target, ++ const void *targinfo) ++{ ++ const struct sk_buff *skb = *pskb; ++ const struct iphdr *iph = ip_hdr(skb); ++ struct rtable *rt = (void *)skb->dst; ++ ++ /* Do we have an input route cache entry? */ ++ if (rt == NULL) ++ return NF_DROP; ++ ++ /* No replies to physical multicast/broadcast */ ++ if (skb->pkt_type != PACKET_HOST && skb->pkt_type != PACKET_OTHERHOST) ++ return NF_DROP; ++ ++ /* Now check at the protocol level */ ++ if (rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST)) ++ return NF_DROP; ++ ++ /* ++ * Our naive response construction does not deal with IP ++ * options, and probably should not try. ++ */ ++ if (iph->ihl * 4 != sizeof(struct iphdr)) ++ return NF_DROP; ++ ++ /* We are not interested in fragments */ ++ if (iph->frag_off & htons(IP_OFFSET)) ++ return NF_DROP; ++ ++ tarpit_tcp(skb, rt, hooknum == NF_IP_LOCAL_IN); ++ return NF_DROP; ++} ++ ++static int xt_tarpit_check(const char *tablename, const void *entry, ++ const struct xt_target *target, void *targinfo, ++ unsigned int hook_mask) ++{ ++ bool invalid; ++ ++ if (strcmp(tablename, "raw") == 0 && hook_mask == NF_IP_PRE_ROUTING) ++ return true; ++ if (strcmp(tablename, "filter") != 0) ++ return false; ++ invalid = hook_mask & ~((1 << NF_IP_LOCAL_IN) | (1 << NF_IP_FORWARD)); ++ return !invalid; ++} ++ ++static struct xt_target xt_tarpit_reg = { ++ .name = "TARPIT", ++ .family = AF_INET, ++ .proto = IPPROTO_TCP, ++ .target = xt_tarpit_target, ++ .checkentry = xt_tarpit_check, ++ .me = THIS_MODULE, ++}; ++ ++static int __init xt_tarpit_init(void) ++{ ++ return xt_register_target(&xt_tarpit_reg); ++} ++ ++static void __exit xt_tarpit_exit(void) ++{ ++ xt_unregister_target(&xt_tarpit_reg); ++} ++ ++module_init(xt_tarpit_init); ++module_exit(xt_tarpit_exit); ++MODULE_DESCRIPTION("netfilter xt_TARPIT target module"); ++MODULE_AUTHOR("Jan Engelhardt <jengelh@gmx.de>"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_TARPIT"); diff --git a/target/linux/generic-2.6/patches/999-backport_ip_hdr_and_friends.patch b/target/linux/generic-2.6/patches/999-backport_ip_hdr_and_friends.patch new file mode 100644 index 0000000000..bb8f4f3342 --- /dev/null +++ b/target/linux/generic-2.6/patches/999-backport_ip_hdr_and_friends.patch @@ -0,0 +1,58 @@ +Index: linux-2.6.21.7/include/linux/ip.h +=================================================================== +--- linux-2.6.21.7.orig/include/linux/ip.h ++++ linux-2.6.21.7/include/linux/ip.h +@@ -104,6 +104,16 @@ struct iphdr { + /*The options start here. */ + }; + ++#ifdef __KERNEL__ ++#include <linux/skbuff.h> ++ ++static inline struct iphdr *ip_hdr(const struct sk_buff *skb) ++{ ++ return (struct iphdr *)skb_network_header(skb); ++} ++ ++#endif ++ + struct ip_auth_hdr { + __u8 nexthdr; + __u8 hdrlen; /* This one is measured in 32 bit units! */ +Index: linux-2.6.21.7/include/linux/skbuff.h +=================================================================== +--- linux-2.6.21.7.orig/include/linux/skbuff.h ++++ linux-2.6.21.7/include/linux/skbuff.h +@@ -966,6 +966,16 @@ static inline void skb_reserve(struct sk + skb->tail += len; + } + ++static inline unsigned char *skb_network_header(const struct sk_buff *skb) ++{ ++ return skb->nh.raw; ++} ++ ++static inline unsigned char *skb_tail_pointer(const struct sk_buff *skb) ++{ ++ return skb->tail; ++} ++ + /* + * CPUs often take a performance hit when accessing unaligned memory + * locations. The actual performance hit varies, it can be small if the +Index: linux-2.6.21.7/include/net/ip.h +=================================================================== +--- linux-2.6.21.7.orig/include/net/ip.h ++++ linux-2.6.21.7/include/net/ip.h +@@ -43,6 +43,11 @@ struct inet_skb_parm + #define IPSKB_REROUTED 16 + }; + ++static inline unsigned int ip_hdrlen(const struct sk_buff *skb) ++{ ++ return ip_hdr(skb)->ihl * 4; ++} ++ + struct ipcm_cookie + { + __be32 addr; |