1 files changed, 117 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_ah.c b/net/ipv4/netfilter/ipt_ah.c
new file mode 100644
index 00000000000..a0fea847cb7
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_ah.c
@@ -0,0 +1,117 @@
+/* Kernel module to match AH parameters. */
+/* (C) 1999-2000 Yon Uriarte <yon@astaro.de>
+ *
+ * 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/netfilter_ipv4/ipt_ah.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Yon Uriarte <yon@astaro.de>");
+MODULE_DESCRIPTION("iptables AH SPI match module");
+
+#ifdef DEBUG_CONNTRACK
+#define duprintf(format, args...) printk(format , ## args)
+#else
+#define duprintf(format, args...)
+#endif
+
+/* Returns 1 if the spi is matched by the range, 0 otherwise */
+static inline int
+spi_match(u_int32_t min, u_int32_t max, u_int32_t spi, int invert)
+{
+	int r=0;
+        duprintf("ah spi_match:%c 0x%x <= 0x%x <= 0x%x",invert? '!':' ',
+        	min,spi,max);
+	r=(spi >= min && spi <= max) ^ invert;
+	duprintf(" result %s\n",r? "PASS" : "FAILED");
+	return r;
+}
+
+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)
+{
+	struct ip_auth_hdr _ahdr, *ah;
+	const struct ipt_ah *ahinfo = matchinfo;
+
+	/* Must not be a fragment. */
+	if (offset)
+		return 0;
+
+	ah = skb_header_pointer(skb, skb->nh.iph->ihl * 4,
+				sizeof(_ahdr), &_ahdr);
+	if (ah == NULL) {
+		/* We've been asked to examine this packet, and we
+		 * can't.  Hence, no choice but to drop.
+		 */
+		duprintf("Dropping evil AH tinygram.\n");
+		*hotdrop = 1;
+		return 0;
+	}
+
+	return spi_match(ahinfo->spis[0], ahinfo->spis[1],
+			 ntohl(ah->spi),
+			 !!(ahinfo->invflags & IPT_AH_INV_SPI));
+}
+
+/* Called when user tries to insert an entry of this type. */
+static int
+checkentry(const char *tablename,
+	   const struct ipt_ip *ip,
+	   void *matchinfo,
+	   unsigned int matchinfosize,
+	   unsigned int hook_mask)
+{
+	const struct ipt_ah *ahinfo = matchinfo;
+
+	/* Must specify proto == AH, and no unknown invflags */
+	if (ip->proto != IPPROTO_AH || (ip->invflags & IPT_INV_PROTO)) {
+		duprintf("ipt_ah: Protocol %u != %u\n", ip->proto,
+			 IPPROTO_AH);
+		return 0;
+	}
+	if (matchinfosize != IPT_ALIGN(sizeof(struct ipt_ah))) {
+		duprintf("ipt_ah: matchsize %u != %u\n",
+			 matchinfosize, IPT_ALIGN(sizeof(struct ipt_ah)));
+		return 0;
+	}
+	if (ahinfo->invflags & ~IPT_AH_INV_MASK) {
+		duprintf("ipt_ah: unknown flags %X\n",
+			 ahinfo->invflags);
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct ipt_match ah_match = {
+	.name		= "ah",
+	.match		= &match,
+	.checkentry	= &checkentry,
+	.me		= THIS_MODULE,
+};
+
+static int __init init(void)
+{
+	return ipt_register_match(&ah_match);
+}
+
+static void __exit cleanup(void)
+{
+	ipt_unregister_match(&ah_match);
+}
+
+module_init(init);
+module_exit(cleanup);