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