[NETFILTER]: nf_conntrack/nf_nat: add TFTP helper port

Add IPv4 and IPv6 capable nf_conntrack port of the TFTP conntrack/NAT helper.

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

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/netfilter/nf_conntrack_tftp.h b/include/linux/netfilter/nf_conntrack_tftp.h
new file mode 100644
index 000000000000..0d79b7ae051f
--- /dev/null
+++ b/include/linux/netfilter/nf_conntrack_tftp.h
@@ -0,0 +1,20 @@
+#ifndef _NF_CONNTRACK_TFTP_H
+#define _NF_CONNTRACK_TFTP_H
+
+#define TFTP_PORT 69
+
+struct tftphdr {
+        __be16 opcode;
+};
+
+#define TFTP_OPCODE_READ        1
+#define TFTP_OPCODE_WRITE       2
+#define TFTP_OPCODE_DATA        3
+#define TFTP_OPCODE_ACK         4
+#define TFTP_OPCODE_ERROR       5
+
+extern unsigned int (*nf_nat_tftp_hook)(struct sk_buff **pskb,
+                                        enum ip_conntrack_info ctinfo,
+                                        struct nf_conntrack_expect *exp);
+
+#endif /* _NF_CONNTRACK_TFTP_H */