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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv4/netfilter/ipt_NOTRACK.c
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'net/ipv4/netfilter/ipt_NOTRACK.c')
-rw-r--r--net/ipv4/netfilter/ipt_NOTRACK.c76
1 files changed, 76 insertions, 0 deletions
diff --git a/net/ipv4/netfilter/ipt_NOTRACK.c b/net/ipv4/netfilter/ipt_NOTRACK.c
new file mode 100644
index 00000000000..a4bb9b3bc29
--- /dev/null
+++ b/net/ipv4/netfilter/ipt_NOTRACK.c
@@ -0,0 +1,76 @@
+/* This is a module which is used for setting up fake conntracks
+ * on packets so that they are not seen by the conntrack/NAT code.
+ */
+#include <linux/module.h>
+#include <linux/skbuff.h>
+
+#include <linux/netfilter_ipv4/ip_tables.h>
+#include <linux/netfilter_ipv4/ip_conntrack.h>
+
+static unsigned int
+target(struct sk_buff **pskb,
+ const struct net_device *in,
+ const struct net_device *out,
+ unsigned int hooknum,
+ const void *targinfo,
+ void *userinfo)
+{
+ /* Previously seen (loopback)? Ignore. */
+ if ((*pskb)->nfct != NULL)
+ return IPT_CONTINUE;
+
+ /* Attach fake conntrack entry.
+ If there is a real ct entry correspondig to this packet,
+ it'll hang aroun till timing out. We don't deal with it
+ for performance reasons. JK */
+ (*pskb)->nfct = &ip_conntrack_untracked.ct_general;
+ (*pskb)->nfctinfo = IP_CT_NEW;
+ nf_conntrack_get((*pskb)->nfct);
+
+ return IPT_CONTINUE;
+}
+
+static int
+checkentry(const char *tablename,
+ const struct ipt_entry *e,
+ void *targinfo,
+ unsigned int targinfosize,
+ unsigned int hook_mask)
+{
+ if (targinfosize != 0) {
+ printk(KERN_WARNING "NOTRACK: targinfosize %u != 0\n",
+ targinfosize);
+ return 0;
+ }
+
+ if (strcmp(tablename, "raw") != 0) {
+ printk(KERN_WARNING "NOTRACK: can only be called from \"raw\" table, not \"%s\"\n", tablename);
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct ipt_target ipt_notrack_reg = {
+ .name = "NOTRACK",
+ .target = target,
+ .checkentry = checkentry,
+ .me = THIS_MODULE
+};
+
+static int __init init(void)
+{
+ if (ipt_register_target(&ipt_notrack_reg))
+ return -EINVAL;
+
+ return 0;
+}
+
+static void __exit fini(void)
+{
+ ipt_unregister_target(&ipt_notrack_reg);
+}
+
+module_init(init);
+module_exit(fini);
+MODULE_LICENSE("GPL");