patch-2.3.99-pre2 linux/net/ipv4/netfilter/ipt_state.c

• Lines: 62
• Date: Fri Mar 17 10:56:20 2000
• Orig file: v2.3.99-pre1/linux/net/ipv4/netfilter/ipt_state.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.99-pre1/linux/net/ipv4/netfilter/ipt_state.c linux/net/ipv4/netfilter/ipt_state.c
@@ -0,0 +1,61 @@
+/* Kernel module to match connection tracking information.
+ * GPL (C) 1999  Rusty Russell (rusty@rustcorp.com.au).
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ipt_state.h>
+EXPORT_NO_SYMBOLS;
+
+static int
+match(const struct sk_buff *skb,
+      const struct net_device *in,
+      const struct net_device *out,
+      const void *matchinfo,
+      int offset,
+      const void *hdr,
+      u_int16_t datalen,
+      int *hotdrop)
+{
+	const struct ipt_state_info *sinfo = matchinfo;
+	enum ip_conntrack_info ctinfo;
+	unsigned int statebit;
+
+	if (!ip_conntrack_get((struct sk_buff *)skb, &ctinfo))
+		statebit = IPT_STATE_INVALID;
+	else
+		statebit = IPT_STATE_BIT(ctinfo);
+
+	return (sinfo->statemask & statebit);
+}
+
+static int check(const char *tablename,
+		 const struct ipt_ip *ip,
+		 void *matchinfo,
+		 unsigned int matchsize,
+		 unsigned int hook_mask)
+{
+	if (matchsize != IPT_ALIGN(sizeof(struct ipt_state_info)))
+		return 0;
+
+	return 1;
+}
+
+static struct ipt_match state_match
+= { { NULL, NULL }, "state", &match, &check, THIS_MODULE };
+
+static int __init init(void)
+{
+	__MOD_INC_USE_COUNT(ip_conntrack_module);
+	return ipt_register_match(&state_match);
+}
+
+static void __exit fini(void)
+{
+	ipt_unregister_match(&state_match);
+	__MOD_DEC_USE_COUNT(ip_conntrack_module);
+}
+
+module_init(init);
+module_exit(fini);