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authorPatrick McHardy <kaber@trash.net>2006-01-06 23:06:48 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2006-01-07 12:57:38 -0800
commite16a8f0b8c53312beb1d8b52e463aae79aa809c7 (patch)
tree2f8e8747261db640e3cc4a5ededb2bcd6a47dedf /net/ipv4
parenteb9c7ebe6980c41cf6ae889e301c3b49f473ee9f (diff)
[NETFILTER]: Add ipt_policy/ip6t_policy matches
Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/Kconfig10
-rw-r--r--net/ipv4/netfilter/Makefile1
-rw-r--r--net/ipv4/netfilter/ipt_policy.c170
3 files changed, 181 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/Kconfig b/net/ipv4/netfilter/Kconfig
index 88a60650e6b8..a9893ec03e02 100644
--- a/net/ipv4/netfilter/Kconfig
+++ b/net/ipv4/netfilter/Kconfig
@@ -487,6 +487,16 @@ config IP_NF_MATCH_STRING
To compile it as a module, choose M here. If unsure, say N.
+config IP_NF_MATCH_POLICY
+ tristate "IPsec policy match support"
+ depends on IP_NF_IPTABLES && XFRM
+ help
+ Policy matching allows you to match packets based on the
+ IPsec policy that was used during decapsulation/will
+ be used during encapsulation.
+
+ To compile it as a module, choose M here. If unsure, say N.
+
# `filter', generic and specific targets
config IP_NF_FILTER
tristate "Packet filtering"
diff --git a/net/ipv4/netfilter/Makefile b/net/ipv4/netfilter/Makefile
index d0a447e520a2..549b01a648b3 100644
--- a/net/ipv4/netfilter/Makefile
+++ b/net/ipv4/netfilter/Makefile
@@ -72,6 +72,7 @@ obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
obj-$(CONFIG_IP_NF_MATCH_REALM) += ipt_realm.o
obj-$(CONFIG_IP_NF_MATCH_ADDRTYPE) += ipt_addrtype.o
obj-$(CONFIG_IP_NF_MATCH_PHYSDEV) += ipt_physdev.o
+obj-$(CONFIG_IP_NF_MATCH_POLICY) += ipt_policy.o
obj-$(CONFIG_IP_NF_MATCH_COMMENT) += ipt_comment.o
obj-$(CONFIG_IP_NF_MATCH_STRING) += ipt_string.o
diff --git a/net/ipv4/netfilter/ipt_policy.c b/net/ipv4/netfilter/ipt_policy.c
new file mode 100644
index 000000000000..709debcc69c9
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_policy.c
@@ -0,0 +1,170 @@
+/* IP tables module for matching IPsec policy
+ *
+ * Copyright (c) 2004,2005 Patrick McHardy, <kaber@trash.net>
+ *
+ * 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/kernel.h>
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/init.h>
+#include <net/xfrm.h>
+
+#include <linux/netfilter_ipv4.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_policy.h>
+
+MODULE_AUTHOR("Patrick McHardy <kaber@trash.net>");
+MODULE_DESCRIPTION("IPtables IPsec policy matching module");
+MODULE_LICENSE("GPL");
+
+
+static inline int
+match_xfrm_state(struct xfrm_state *x, const struct ipt_policy_elem *e)
+{
+#define MATCH(x,y) (!e->match.x || ((e->x == (y)) ^ e->invert.x))
+
+ return MATCH(saddr, x->props.saddr.a4 & e->smask) &&
+ MATCH(daddr, x->id.daddr.a4 & e->dmask) &&
+ MATCH(proto, x->id.proto) &&
+ MATCH(mode, x->props.mode) &&
+ MATCH(spi, x->id.spi) &&
+ MATCH(reqid, x->props.reqid);
+}
+
+static int
+match_policy_in(const struct sk_buff *skb, const struct ipt_policy_info *info)
+{
+ const struct ipt_policy_elem *e;
+ struct sec_path *sp = skb->sp;
+ int strict = info->flags & IPT_POLICY_MATCH_STRICT;
+ int i, pos;
+
+ if (sp == NULL)
+ return -1;
+ if (strict && info->len != sp->len)
+ return 0;
+
+ for (i = sp->len - 1; i >= 0; i--) {
+ pos = strict ? i - sp->len + 1 : 0;
+ if (pos >= info->len)
+ return 0;
+ e = &info->pol[pos];
+
+ if (match_xfrm_state(sp->x[i].xvec, e)) {
+ if (!strict)
+ return 1;
+ } else if (strict)
+ return 0;
+ }
+
+ return strict ? 1 : 0;
+}
+
+static int
+match_policy_out(const struct sk_buff *skb, const struct ipt_policy_info *info)
+{
+ const struct ipt_policy_elem *e;
+ struct dst_entry *dst = skb->dst;
+ int strict = info->flags & IPT_POLICY_MATCH_STRICT;
+ int i, pos;
+
+ if (dst->xfrm == NULL)
+ return -1;
+
+ for (i = 0; dst && dst->xfrm; dst = dst->child, i++) {
+ pos = strict ? i : 0;
+ if (pos >= info->len)
+ return 0;
+ e = &info->pol[pos];
+
+ if (match_xfrm_state(dst->xfrm, e)) {
+ if (!strict)
+ return 1;
+ } else if (strict)
+ return 0;
+ }
+
+ return strict ? 1 : 0;
+}
+
+static int match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo, int offset, int *hotdrop)
+{
+ const struct ipt_policy_info *info = matchinfo;
+ int ret;
+
+ if (info->flags & IPT_POLICY_MATCH_IN)
+ ret = match_policy_in(skb, info);
+ else
+ ret = match_policy_out(skb, info);
+
+ if (ret < 0)
+ ret = info->flags & IPT_POLICY_MATCH_NONE ? 1 : 0;
+ else if (info->flags & IPT_POLICY_MATCH_NONE)
+ ret = 0;
+
+ return ret;
+}
+
+static int checkentry(const char *tablename, const struct ipt_ip *ip,
+ void *matchinfo, unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ struct ipt_policy_info *info = matchinfo;
+
+ if (matchsize != IPT_ALIGN(sizeof(*info))) {
+ printk(KERN_ERR "ipt_policy: matchsize %u != %zu\n",
+ matchsize, IPT_ALIGN(sizeof(*info)));
+ return 0;
+ }
+ if (!(info->flags & (IPT_POLICY_MATCH_IN|IPT_POLICY_MATCH_OUT))) {
+ printk(KERN_ERR "ipt_policy: neither incoming nor "
+ "outgoing policy selected\n");
+ return 0;
+ }
+ if (hook_mask & (1 << NF_IP_PRE_ROUTING | 1 << NF_IP_LOCAL_IN)
+ && info->flags & IPT_POLICY_MATCH_OUT) {
+ printk(KERN_ERR "ipt_policy: output policy not valid in "
+ "PRE_ROUTING and INPUT\n");
+ return 0;
+ }
+ if (hook_mask & (1 << NF_IP_POST_ROUTING | 1 << NF_IP_LOCAL_OUT)
+ && info->flags & IPT_POLICY_MATCH_IN) {
+ printk(KERN_ERR "ipt_policy: input policy not valid in "
+ "POST_ROUTING and OUTPUT\n");
+ return 0;
+ }
+ if (info->len > IPT_POLICY_MAX_ELEM) {
+ printk(KERN_ERR "ipt_policy: too many policy elements\n");
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_match policy_match = {
+ .name = "policy",
+ .match = match,
+ .checkentry = checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ return ipt_register_match(&policy_match);
+}
+
+static void __exit fini(void)
+{
+ ipt_unregister_match(&policy_match);
+}
+
+module_init(init);
+module_exit(fini);