From a58eaf210a223672f67c03d2070fa2fefdb2595b Mon Sep 17 00:00:00 2001 From: juhosg Date: Tue, 15 Apr 2008 06:11:23 +0000 Subject: update iptables to 1.4.0 (2.6 kernels only), refresh kernel patches git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10843 3c298f89-4303-0410-b956-a3cf2f4a3e73 --- .../101-netfilter_layer7_pktmatch.patch | 113 +++ .../patches-2.6.23/170-netfilter_chaostables.patch | 970 --------------------- .../170-netfilter_chaostables_0.8.patch | 866 ++++++++++++++++++ .../patches-2.6.23/171-netfilter_tarpit.patch | 20 +- 4 files changed, 989 insertions(+), 980 deletions(-) create mode 100644 target/linux/generic-2.6/patches-2.6.23/101-netfilter_layer7_pktmatch.patch delete mode 100644 target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables.patch create mode 100644 target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables_0.8.patch (limited to 'target/linux/generic-2.6/patches-2.6.23') diff --git a/target/linux/generic-2.6/patches-2.6.23/101-netfilter_layer7_pktmatch.patch b/target/linux/generic-2.6/patches-2.6.23/101-netfilter_layer7_pktmatch.patch new file mode 100644 index 000000000..257454313 --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.23/101-netfilter_layer7_pktmatch.patch @@ -0,0 +1,113 @@ +Index: linux-2.6.23.16/include/linux/netfilter/xt_layer7.h +=================================================================== +--- linux-2.6.23.16.orig/include/linux/netfilter/xt_layer7.h ++++ linux-2.6.23.16/include/linux/netfilter/xt_layer7.h +@@ -8,6 +8,7 @@ struct xt_layer7_info { + char protocol[MAX_PROTOCOL_LEN]; + char pattern[MAX_PATTERN_LEN]; + u_int8_t invert; ++ u_int8_t pkt; + }; + + #endif /* _XT_LAYER7_H */ +Index: linux-2.6.23.16/net/netfilter/xt_layer7.c +=================================================================== +--- linux-2.6.23.16.orig/net/netfilter/xt_layer7.c ++++ linux-2.6.23.16/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 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. */ +- if(!master_conntrack->layer7.app_data) 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. */ +- for(i = 0; i < maxdatalen-oldlength-1 && +- 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] = + 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; ++/* add the new app data to the conntrack. Return number of bytes added. */ ++static int add_data(struct nf_conn * master_conntrack, ++ char * app_data, int appdatalen) ++{ ++ int length; + ++ length = add_datastr(master_conntrack->layer7.app_data, master_conntrack->layer7.app_data_len, app_data, appdatalen); ++ master_conntrack->layer7.app_data_len += length; + return length; + } + +@@ -411,7 +413,7 @@ match(const struct sk_buff *skbin, + const struct xt_layer7_info * info = matchinfo; + enum ip_conntrack_info master_ctinfo, ctinfo; + struct nf_conn *master_conntrack, *conntrack; +- unsigned char * app_data; ++ unsigned char *app_data, *tmp_data; + unsigned int pattern_result, appdatalen; + regexp * comppattern; + +@@ -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); +@@ -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); + ++ if (info->pkt) { ++ tmp_data = kmalloc(maxdatalen, GFP_ATOMIC); ++ if(!tmp_data){ ++ if (net_ratelimit()) ++ printk(KERN_ERR "layer7: out of memory in match, bailing.\n"); ++ return info->invert; ++ } ++ ++ 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 */ + if(TOTAL_PACKETS == 1 && !skb->cb[0] && + !master_conntrack->layer7.app_data){ diff --git a/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables.patch b/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables.patch deleted file mode 100644 index cfc009233..000000000 --- a/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables.patch +++ /dev/null @@ -1,970 +0,0 @@ -Index: linux-2.6.23/include/linux/netfilter/oot_conntrack.h -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/include/linux/netfilter/oot_conntrack.h 2007-10-10 13:52:59.000000000 +0800 -@@ -0,0 +1,5 @@ -+#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) -+# include -+#else /* linux-2.6.20+ */ -+# include -+#endif -Index: linux-2.6.23/include/linux/netfilter/oot_trans.h -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/include/linux/netfilter/oot_trans.h 2007-10-10 13:52:59.000000000 +0800 -@@ -0,0 +1,14 @@ -+/* Out of tree workarounds */ -+#include -+#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-2.6.23/include/linux/netfilter/xt_CHAOS.h -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/include/linux/netfilter/xt_CHAOS.h 2007-10-10 13:52:59.000000000 +0800 -@@ -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 */ -Index: linux-2.6.23/include/linux/netfilter/xt_portscan.h -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/include/linux/netfilter/xt_portscan.h 2007-10-10 13:52:59.000000000 +0800 -@@ -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 */ -Index: linux-2.6.23/net/netfilter/find_match.c -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/net/netfilter/find_match.c 2007-10-10 13:52:59.000000000 +0800 -@@ -0,0 +1,39 @@ -+/* -+ xt_request_find_match -+ by Jan Engelhardt , 2006 - 2007 -+ -+ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: -+ Copyright (C) 2006-2006 Harald Welte -+ 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 -+#include -+#include -+#include -+ -+/* -+ * 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-2.6.23/net/netfilter/Kconfig -=================================================================== ---- linux-2.6.23.orig/net/netfilter/Kconfig 2007-10-10 04:31:38.000000000 +0800 -+++ linux-2.6.23/net/netfilter/Kconfig 2007-10-10 13:53:04.000000000 +0800 -@@ -265,6 +265,14 @@ - - # 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 -@@ -292,6 +300,14 @@ - . The module will be called - ipt_CONNMARK.ko. 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 -@@ -556,6 +572,14 @@ - - 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 -Index: linux-2.6.23/net/netfilter/Makefile -=================================================================== ---- linux-2.6.23.orig/net/netfilter/Makefile 2007-10-10 04:31:38.000000000 +0800 -+++ linux-2.6.23/net/netfilter/Makefile 2007-10-10 13:52:59.000000000 +0800 -@@ -38,8 +38,10 @@ - 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 -@@ -66,6 +68,7 @@ - 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 -Index: linux-2.6.23/net/netfilter/xt_CHAOS.c -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/net/netfilter/xt_CHAOS.c 2007-10-10 13:52:59.000000000 +0800 -@@ -0,0 +1,205 @@ -+/* -+ CHAOS target for netfilter -+ -+ Copyright © 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 -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include "find_match.c" -+#include -+#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 = ip_hdrlen(*pskb); -+ const int offset = ntohs(ip_hdr(*pskb)->frag_off) & IP_OFFSET; -+ const struct xt_target *destiny; -+ bool hotdrop = false; -+ int 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(ip_hdr(*pskb)->protocol == IPPROTO_TCP && -+ info->variant != XTCHAOS_NORMAL && hooknum != NF_IP_LOCAL_OUT) -+ xt_chaos_total(info, pskb, in, out, hooknum); -+ -+ return NF_DROP; -+} -+ -+static bool 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 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 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 "); -+MODULE_DESCRIPTION("netfilter CHAOS target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_CHAOS"); -Index: linux-2.6.23/net/netfilter/xt_DELUDE.c -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/net/netfilter/xt_DELUDE.c 2007-10-10 13:52:59.000000000 +0800 -@@ -0,0 +1,288 @@ -+/* -+ DELUDE target -+ Copyright © Jan Engelhardt , 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 -+ -+ 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 -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#ifdef CONFIG_BRIDGE_NETFILTER -+# include -+#endif -+#include -+#define PFX KBUILD_MODNAME ": " -+ -+static inline struct rtable *route_reverse(struct sk_buff *skb, -+ struct tcphdr *tcph, int hook) -+{ -+ struct iphdr *iph = ip_hdr(skb); -+ 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 = ip_hdr(oldskb); -+ struct tcphdr _otcph, *oth, *tcph; -+ __be16 tmp_port; -+ __be32 tmp_addr; -+ int needs_ack; -+ unsigned int addr_type; -+ -+ /* IP header checks: fragment. */ -+ if (iph->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->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 = tcp_hdr(nskb); -+ -+ /* Swap source and dest */ -+ tmp_addr = ip_hdr(nskb)->saddr; -+ ip_hdr(nskb)->saddr = ip_hdr(nskb)->daddr; -+ ip_hdr(nskb)->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)); -+ ip_hdr(nskb)->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 = htonl(secure_tcp_sequence_number( -+ ip_hdr(nskb)->saddr, ip_hdr(nskb)->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 - ip_hdrlen(oldskb) -+ - (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), -+ ip_hdr(nskb)->saddr, -+ ip_hdr(nskb)->daddr, -+ csum_partial((char *)tcph, -+ sizeof(struct tcphdr), 0)); -+ -+ /* Set DF, id = 0 */ -+ ip_hdr(nskb)->frag_off = htons(IP_DF); -+ ip_hdr(nskb)->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 */ -+ ip_hdr(nskb)->ttl = dst_metric(nskb->dst, RTAX_HOPLIMIT); -+ -+ /* Adjust IP checksum */ -+ ip_hdr(nskb)->check = 0; -+ ip_hdr(nskb)->check = ip_fast_csum((unsigned char *)ip_hdr(nskb), -+ ip_hdr(nskb)->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 bool 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 false; -+ } -+ return true; -+} -+ -+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 "); -+MODULE_DESCRIPTION("netfilter DELUDE target"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_DELUDE"); -Index: linux-2.6.23/net/netfilter/xt_portscan.c -=================================================================== ---- /dev/null 1970-01-01 00:00:00.000000000 +0000 -+++ linux-2.6.23/net/netfilter/xt_portscan.c 2007-10-10 13:52:59.000000000 +0800 -@@ -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 -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#include -+#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 bool 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, bool *hotdrop) -+{ -+ const struct xt_portscan_info *info = matchinfo; -+ enum ip_conntrack_info ctstate; -+ struct nf_conn *ctdata; -+ const struct tcphdr *tcph; -+ 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 xt_portscan_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->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 bool 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 false; -+ } -+#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 false; -+ } -+ return true; -+} -+ -+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 "); -+MODULE_DESCRIPTION("netfilter portscan match module"); -+MODULE_LICENSE("GPL"); -+MODULE_ALIAS("ipt_portscan"); -Index: linux-2.6.23/drivers/char/random.c -=================================================================== ---- linux-2.6.23.orig/drivers/char/random.c 2007-10-10 04:31:38.000000000 +0800 -+++ linux-2.6.23/drivers/char/random.c 2007-10-10 13:52:59.000000000 +0800 -@@ -1564,6 +1564,8 @@ - return seq; - } - -+EXPORT_SYMBOL(secure_tcp_sequence_number); -+ - /* Generate secure starting point for ephemeral IPV4 transport port search */ - u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport) - { diff --git a/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables_0.8.patch b/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables_0.8.patch new file mode 100644 index 000000000..ad9e0597b --- /dev/null +++ b/target/linux/generic-2.6/patches-2.6.23/170-netfilter_chaostables_0.8.patch @@ -0,0 +1,866 @@ +Index: linux-2.6.23.16/include/linux/netfilter/oot_conntrack.h +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/include/linux/netfilter/oot_conntrack.h +@@ -0,0 +1,5 @@ ++#if defined(CONFIG_IP_NF_CONNTRACK) || defined(CONFIG_IP_NF_CONNTRACK_MODULE) ++# include ++#else /* linux-2.6.20+ */ ++# include ++#endif +Index: linux-2.6.23.16/include/linux/netfilter/oot_trans.h +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/include/linux/netfilter/oot_trans.h +@@ -0,0 +1,14 @@ ++/* Out of tree workarounds */ ++#include ++#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-2.6.23.16/include/linux/netfilter/xt_CHAOS.h +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/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-2.6.23.16/include/linux/netfilter/xt_portscan.h +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/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-2.6.23.16/net/netfilter/find_match.c +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/net/netfilter/find_match.c +@@ -0,0 +1,39 @@ ++/* ++ xt_request_find_match ++ by Jan Engelhardt , 2006 - 2007 ++ ++ Based upon linux-2.6.18.5/net/netfilter/x_tables.c: ++ Copyright (C) 2006-2006 Harald Welte ++ 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 ++#include ++#include ++#include ++ ++/* ++ * 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-2.6.23.16/net/netfilter/Kconfig +=================================================================== +--- linux-2.6.23.16.orig/net/netfilter/Kconfig ++++ linux-2.6.23.16/net/netfilter/Kconfig +@@ -265,6 +265,14 @@ 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 +@@ -292,6 +300,14 @@ config NETFILTER_XT_TARGET_CONNMARK + . The module will be called + ipt_CONNMARK.ko. 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 +@@ -556,6 +572,14 @@ 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-2.6.23.16/net/netfilter/Makefile +=================================================================== +--- linux-2.6.23.16.orig/net/netfilter/Makefile ++++ linux-2.6.23.16/net/netfilter/Makefile +@@ -49,6 +49,8 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) + 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 +@@ -78,3 +80,4 @@ obj-$(CONFIG_NETFILTER_XT_MATCH_TCPMSS) + obj-$(CONFIG_NETFILTER_XT_MATCH_PHYSDEV) += xt_physdev.o + obj-$(CONFIG_NETFILTER_XT_MATCH_U32) += xt_u32.o + obj-$(CONFIG_NETFILTER_XT_MATCH_HASHLIMIT) += xt_hashlimit.o ++obj-$(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) += xt_portscan.o +Index: linux-2.6.23.16/net/netfilter/xt_CHAOS.c +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/net/netfilter/xt_CHAOS.c +@@ -0,0 +1,200 @@ ++/* ++ * CHAOS target for netfilter ++ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 ++ * Contact: Jan Engelhardt ++ * ++ * 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 ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#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 ++# 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; ++ bool hotdrop = false, 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 bool 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 "); ++MODULE_DESCRIPTION("netfilter \"CHAOS\" target"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_CHAOS"); +Index: linux-2.6.23.16/net/netfilter/xt_DELUDE.c +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/net/netfilter/xt_DELUDE.c +@@ -0,0 +1,197 @@ ++/* ++ * DELUDE target ++ * Copyright © CC Computer Consultants GmbH, 2007 ++ * Contact: Jan Engelhardt ++ * ++ * 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 ++ * ++ * 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 ++#include ++#include ++#include ++#include ++#ifdef CONFIG_BRIDGE_NETFILTER ++# include ++#endif ++#include ++#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 "); ++MODULE_DESCRIPTION("netfilter \"DELUDE\" target"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_DELUDE"); +Index: linux-2.6.23.16/net/netfilter/xt_portscan.c +=================================================================== +--- /dev/null ++++ linux-2.6.23.16/net/netfilter/xt_portscan.c +@@ -0,0 +1,269 @@ ++/* ++ * portscan match for netfilter ++ * Copyright © CC Computer Consultants GmbH, 2006 - 2007 ++ * Contact: Jan Engelhardt ++ * ++ * 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 ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#include ++#if defined(_LOCAL) ++# include "xt_portscan.h" ++#elif defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN) || \ ++ defined(CONFIG_NETFILTER_XT_MATCH_PORTSCAN_MODULE) ++# include ++#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 bool 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, bool *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 bool 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 "); ++MODULE_DESCRIPTION("netfilter \"portscan\" match"); ++MODULE_LICENSE("GPL"); ++MODULE_ALIAS("ipt_portscan"); +Index: linux-2.6.23.16/drivers/char/random.c +=================================================================== +--- linux-2.6.23.16.orig/drivers/char/random.c ++++ linux-2.6.23.16/drivers/char/random.c +@@ -1564,6 +1564,8 @@ __u32 secure_tcp_sequence_number(__be32 + return seq; + } + ++EXPORT_SYMBOL(secure_tcp_sequence_number); ++ + /* Generate secure starting point for ephemeral IPV4 transport port search */ + u32 secure_ipv4_port_ephemeral(__be32 saddr, __be32 daddr, __be16 dport) + { diff --git a/target/linux/generic-2.6/patches-2.6.23/171-netfilter_tarpit.patch b/target/linux/generic-2.6/patches-2.6.23/171-netfilter_tarpit.patch index 058dda5c2..073951a15 100644 --- a/target/linux/generic-2.6/patches-2.6.23/171-netfilter_tarpit.patch +++ b/target/linux/generic-2.6/patches-2.6.23/171-netfilter_tarpit.patch @@ -1,7 +1,7 @@ -Index: linux-2.6.23/net/netfilter/Kconfig +Index: linux-2.6.23.16/net/netfilter/Kconfig =================================================================== ---- linux-2.6.23.orig/net/netfilter/Kconfig -+++ linux-2.6.23/net/netfilter/Kconfig +--- linux-2.6.23.16.orig/net/netfilter/Kconfig ++++ linux-2.6.23.16/net/netfilter/Kconfig @@ -401,6 +401,23 @@ config NETFILTER_XT_TARGET_CONNSECMARK To compile it as a module, choose M here. If unsure, say N. @@ -26,22 +26,22 @@ Index: linux-2.6.23/net/netfilter/Kconfig config NETFILTER_XT_TARGET_TCPMSS tristate '"TCPMSS" target support' depends on NETFILTER_XTABLES && (IPV6 || IPV6=n) -Index: linux-2.6.23/net/netfilter/Makefile +Index: linux-2.6.23.16/net/netfilter/Makefile =================================================================== ---- linux-2.6.23.orig/net/netfilter/Makefile -+++ linux-2.6.23/net/netfilter/Makefile -@@ -49,6 +49,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) +--- linux-2.6.23.16.orig/net/netfilter/Makefile ++++ linux-2.6.23.16/net/netfilter/Makefile +@@ -47,6 +47,7 @@ obj-$(CONFIG_NETFILTER_XT_TARGET_NFLOG) obj-$(CONFIG_NETFILTER_XT_TARGET_NOTRACK) += xt_NOTRACK.o obj-$(CONFIG_NETFILTER_XT_TARGET_TRACE) += xt_TRACE.o obj-$(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-$(CONFIG_NETFILTER_XT_TARGET_CONNSECMARK) += xt_CONNSECMARK.o - -Index: linux-2.6.23/net/netfilter/xt_TARPIT.c + obj-$(CONFIG_NETFILTER_XT_TARGET_CHAOS) += xt_CHAOS.o +Index: linux-2.6.23.16/net/netfilter/xt_TARPIT.c =================================================================== --- /dev/null -+++ linux-2.6.23/net/netfilter/xt_TARPIT.c ++++ linux-2.6.23.16/net/netfilter/xt_TARPIT.c @@ -0,0 +1,280 @@ +/* + * Kernel module to capture and hold incoming TCP connections using -- cgit v1.2.3