Imported linux-2.6.27.39 suse/xen patches.

[ipfire-2.x.git] / src / patches / suse-2.6.27.39 / patches.suse / netfilter-ipv4options

From: Fabrice MARIE <fabrice@netfilter.org>
From: Harald Welte <laforge@netfilter.org>
Subject: netfilter ipv4options match from patch-o-matic-ng
References: bnc#131728 - FATE#182

This is a module which is used to match ipv4 options.

Updated-by: Jeff Mahoney <jeffm@suse.com>

Acked-by: Olaf Kirch <okir@suse.de>
Acked-by: Jaroslav Kysela <perex@suse.de>
---

 include/linux/netfilter_ipv4/ipt_ipv4options.h |   21 +++
 net/ipv4/netfilter/Kconfig                     |   14 ++
 net/ipv4/netfilter/Makefile                    |    1 
 net/ipv4/netfilter/ipt_ipv4options.c           |  175 +++++++++++++++++++++++++
 4 files changed, 211 insertions(+)

--- /dev/null
+++ b/include/linux/netfilter_ipv4/ipt_ipv4options.h
@@ -0,0 +1,21 @@
+#ifndef __ipt_ipv4options_h_included__
+#define __ipt_ipv4options_h_included__
+
+#define IPT_IPV4OPTION_MATCH_SSRR		0x01  /* For strict source routing */
+#define IPT_IPV4OPTION_MATCH_LSRR		0x02  /* For loose source routing */
+#define IPT_IPV4OPTION_DONT_MATCH_SRR		0x04  /* any source routing */
+#define IPT_IPV4OPTION_MATCH_RR			0x08  /* For Record route */
+#define IPT_IPV4OPTION_DONT_MATCH_RR		0x10
+#define IPT_IPV4OPTION_MATCH_TIMESTAMP		0x20  /* For timestamp request */
+#define IPT_IPV4OPTION_DONT_MATCH_TIMESTAMP	0x40
+#define IPT_IPV4OPTION_MATCH_ROUTER_ALERT	0x80  /* For router-alert */
+#define IPT_IPV4OPTION_DONT_MATCH_ROUTER_ALERT	0x100
+#define IPT_IPV4OPTION_MATCH_ANY_OPT		0x200 /* match packet with any option */
+#define IPT_IPV4OPTION_DONT_MATCH_ANY_OPT	0x400 /* match packet with no option */
+
+struct ipt_ipv4options_info {
+	u_int16_t options;
+};
+
+
+#endif /* __ipt_ipv4options_h_included__ */
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -111,6 +111,20 @@ config IP_NF_MATCH_ADDRTYPE
 	  If you want to compile it as a module, say M here and read
 	  <file:Documentation/kbuild/modules.txt>.  If unsure, say `N'.
 
+config IP_NF_MATCH_IPV4OPTIONS
+	tristate  'IPV4OPTIONS match support'
+	depends on IP_NF_IPTABLES
+	help
+	  This option adds a IPV4OPTIONS match.
+	  It allows you to filter options like source routing,
+	  record route, timestamp and router-altert.
+
+	  If you say Y here, try iptables -m ipv4options --help for more information.
+
+	  If you want to compile it as a module, say M here and read
+	  Documentation/modules.txt.  If unsure, say 'N'.
+
+
 # `filter', generic and specific targets
 config IP_NF_FILTER
 	tristate "Packet filtering"
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -50,6 +50,7 @@ obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
 obj-$(CONFIG_IP_NF_MATCH_ECN) += ipt_ecn.o
 obj-$(CONFIG_IP_NF_MATCH_RECENT) += ipt_recent.o
 obj-$(CONFIG_IP_NF_MATCH_TTL) += ipt_ttl.o
+obj-$(CONFIG_IP_NF_MATCH_IPV4OPTIONS) += ipt_ipv4options.o
 
 # targets
 obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ipv4options.c
@@ -0,0 +1,175 @@
+/*
+  This is a module which is used to match ipv4 options.
+  This file is distributed under the terms of the GNU General Public
+  License (GPL). Copies of the GPL can be obtained from:
+  ftp://prep.ai.mit.edu/pub/gnu/GPL
+
+  11-mars-2001 Fabrice MARIE <fabrice@netfilter.org> : initial development.
+  12-july-2001 Fabrice MARIE <fabrice@netfilter.org> : added router-alert otions matching. Fixed a bug with no-srr
+  12-august-2001 Imran Patel <ipatel@crosswinds.net> : optimization of the match.
+  18-november-2001 Fabrice MARIE <fabrice@netfilter.org> : added [!] 'any' option match.
+  19-february-2004 Harald Welte <laforge@netfilter.org> : merge with 2.6.x
+*/
+
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <net/ip.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_ipv4options.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Fabrice Marie <fabrice@netfilter.org>");
+
+static bool
+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 ipt_ipv4options_info *info = matchinfo;   /* match info for rule */
+	const struct iphdr *iph = ip_hdr(skb);
+	const struct ip_options *opt;
+
+	if (iph->ihl * 4 == sizeof(struct iphdr)) {
+		/* No options, so we match only the "DONTs" and the "IGNOREs" */
+
+		if (((info->options & IPT_IPV4OPTION_MATCH_ANY_OPT) == IPT_IPV4OPTION_MATCH_ANY_OPT) ||
+		    ((info->options & IPT_IPV4OPTION_MATCH_SSRR) == IPT_IPV4OPTION_MATCH_SSRR) ||
+		    ((info->options & IPT_IPV4OPTION_MATCH_LSRR) == IPT_IPV4OPTION_MATCH_LSRR) ||
+		    ((info->options & IPT_IPV4OPTION_MATCH_RR) == IPT_IPV4OPTION_MATCH_RR) ||
+		    ((info->options & IPT_IPV4OPTION_MATCH_TIMESTAMP) == IPT_IPV4OPTION_MATCH_TIMESTAMP) ||
+                    ((info->options & IPT_IPV4OPTION_MATCH_ROUTER_ALERT) == IPT_IPV4OPTION_MATCH_ROUTER_ALERT))
+			return 0;
+		return 1;
+	}
+	else {
+		if ((info->options & IPT_IPV4OPTION_MATCH_ANY_OPT) == IPT_IPV4OPTION_MATCH_ANY_OPT)
+			/* there are options, and we don't need to care which one */
+			return 1;
+		else {
+			if ((info->options & IPT_IPV4OPTION_DONT_MATCH_ANY_OPT) == IPT_IPV4OPTION_DONT_MATCH_ANY_OPT)
+				/* there are options but we don't want any ! */
+				return 0;
+		}
+	}
+
+	opt = &(IPCB(skb)->opt);
+
+	/* source routing */
+	if ((info->options & IPT_IPV4OPTION_MATCH_SSRR) == IPT_IPV4OPTION_MATCH_SSRR) {
+		if (!((opt->srr) && (opt->is_strictroute)))
+			return 0;
+	}
+	else if ((info->options & IPT_IPV4OPTION_MATCH_LSRR) == IPT_IPV4OPTION_MATCH_LSRR) {
+		if (!((opt->srr) && (!opt->is_strictroute)))
+			return 0;
+	}
+	else if ((info->options & IPT_IPV4OPTION_DONT_MATCH_SRR) == IPT_IPV4OPTION_DONT_MATCH_SRR) {
+		if (opt->srr)
+			return 0;
+	}
+	/* record route */
+	if ((info->options & IPT_IPV4OPTION_MATCH_RR) == IPT_IPV4OPTION_MATCH_RR) {
+		if (!opt->rr)
+			return 0;
+	}
+	else if ((info->options & IPT_IPV4OPTION_DONT_MATCH_RR) == IPT_IPV4OPTION_DONT_MATCH_RR) {
+		if (opt->rr)
+			return 0;
+	}
+	/* timestamp */
+	if ((info->options & IPT_IPV4OPTION_MATCH_TIMESTAMP) == IPT_IPV4OPTION_MATCH_TIMESTAMP) {
+		if (!opt->ts)
+			return 0;
+	}
+	else if ((info->options & IPT_IPV4OPTION_DONT_MATCH_TIMESTAMP) == IPT_IPV4OPTION_DONT_MATCH_TIMESTAMP) {
+		if (opt->ts)
+			return 0;
+	}
+	/* router-alert option  */
+	if ((info->options & IPT_IPV4OPTION_MATCH_ROUTER_ALERT) == IPT_IPV4OPTION_MATCH_ROUTER_ALERT) {
+		if (!opt->router_alert)
+			return 0;
+	}
+	else if ((info->options & IPT_IPV4OPTION_DONT_MATCH_ROUTER_ALERT) == IPT_IPV4OPTION_DONT_MATCH_ROUTER_ALERT) {
+		if (opt->router_alert)
+			return 0;
+	}
+
+	/* we match ! */
+	return 1;
+}
+
+static bool
+checkentry(const char *tablename,
+	   const void *ip,
+	   const struct xt_match *match,
+	   void *matchinfo,
+	   unsigned int hook_mask)
+{
+	const struct ipt_ipv4options_info *info = matchinfo;   /* match info for rule */
+	/* Check the size */
+	if (match->matchsize != IPT_ALIGN(sizeof(struct ipt_ipv4options_info)))
+		return 0;
+	/* Now check the coherence of the data ... */
+	if (((info->options & IPT_IPV4OPTION_MATCH_ANY_OPT) == IPT_IPV4OPTION_MATCH_ANY_OPT) &&
+	    (((info->options & IPT_IPV4OPTION_DONT_MATCH_SRR) == IPT_IPV4OPTION_DONT_MATCH_SRR) ||
+	     ((info->options & IPT_IPV4OPTION_DONT_MATCH_RR) == IPT_IPV4OPTION_DONT_MATCH_RR) ||
+	     ((info->options & IPT_IPV4OPTION_DONT_MATCH_TIMESTAMP) == IPT_IPV4OPTION_DONT_MATCH_TIMESTAMP) ||
+	     ((info->options & IPT_IPV4OPTION_DONT_MATCH_ROUTER_ALERT) == IPT_IPV4OPTION_DONT_MATCH_ROUTER_ALERT) ||
+	     ((info->options & IPT_IPV4OPTION_DONT_MATCH_ANY_OPT) == IPT_IPV4OPTION_DONT_MATCH_ANY_OPT)))
+		return 0; /* opposites */
+	if (((info->options & IPT_IPV4OPTION_DONT_MATCH_ANY_OPT) == IPT_IPV4OPTION_DONT_MATCH_ANY_OPT) &&
+	    (((info->options & IPT_IPV4OPTION_MATCH_LSRR) == IPT_IPV4OPTION_MATCH_LSRR) ||
+	     ((info->options & IPT_IPV4OPTION_MATCH_SSRR) == IPT_IPV4OPTION_MATCH_SSRR) ||
+	     ((info->options & IPT_IPV4OPTION_MATCH_RR) == IPT_IPV4OPTION_MATCH_RR) ||
+	     ((info->options & IPT_IPV4OPTION_MATCH_TIMESTAMP) == IPT_IPV4OPTION_MATCH_TIMESTAMP) ||
+	     ((info->options & IPT_IPV4OPTION_MATCH_ROUTER_ALERT) == IPT_IPV4OPTION_MATCH_ROUTER_ALERT) ||
+	     ((info->options & IPT_IPV4OPTION_MATCH_ANY_OPT) == IPT_IPV4OPTION_MATCH_ANY_OPT)))
+		return 0; /* opposites */
+	if (((info->options & IPT_IPV4OPTION_MATCH_SSRR) == IPT_IPV4OPTION_MATCH_SSRR) &&
+	    ((info->options & IPT_IPV4OPTION_MATCH_LSRR) == IPT_IPV4OPTION_MATCH_LSRR))
+		return 0; /* cannot match in the same time loose and strict source routing */
+	if ((((info->options & IPT_IPV4OPTION_MATCH_SSRR) == IPT_IPV4OPTION_MATCH_SSRR) ||
+	     ((info->options & IPT_IPV4OPTION_MATCH_LSRR) == IPT_IPV4OPTION_MATCH_LSRR)) &&
+	    ((info->options & IPT_IPV4OPTION_DONT_MATCH_SRR) == IPT_IPV4OPTION_DONT_MATCH_SRR))
+		return 0; /* opposites */
+	if (((info->options & IPT_IPV4OPTION_MATCH_RR) == IPT_IPV4OPTION_MATCH_RR) &&
+	    ((info->options & IPT_IPV4OPTION_DONT_MATCH_RR) == IPT_IPV4OPTION_DONT_MATCH_RR))
+		return 0; /* opposites */
+	if (((info->options & IPT_IPV4OPTION_MATCH_TIMESTAMP) == IPT_IPV4OPTION_MATCH_TIMESTAMP) &&
+	    ((info->options & IPT_IPV4OPTION_DONT_MATCH_TIMESTAMP) == IPT_IPV4OPTION_DONT_MATCH_TIMESTAMP))
+		return 0; /* opposites */
+	if (((info->options & IPT_IPV4OPTION_MATCH_ROUTER_ALERT) == IPT_IPV4OPTION_MATCH_ROUTER_ALERT) &&
+	    ((info->options & IPT_IPV4OPTION_DONT_MATCH_ROUTER_ALERT) == IPT_IPV4OPTION_DONT_MATCH_ROUTER_ALERT))
+		return 0; /* opposites */
+
+	/* everything looks ok. */
+	return 1;
+}
+
+static struct xt_match ipv4options_match = {
+	.name = "ipv4options",
+	.match = match,
+	.matchsize = sizeof(struct ipt_ipv4options_info),
+	.checkentry = checkentry,
+	.me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+	return xt_register_match(&ipv4options_match);
+}
+
+static void __exit fini(void)
+{
+	xt_unregister_match(&ipv4options_match);
+}
+
+module_init(init);
+module_exit(fini);