[NETFILTER]: Add ipt_policy/ip6t_policy matches

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

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);