[NETFILTER]: nf_nat: add FTP NAT helper port

Add FTP NAT helper.

Split out from Jozsef's big nf_nat patch with a few small fixes by myself.

Signed-off-by: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

2 files changed, 49 insertions, 11 deletions

diff --git a/include/linux/netfilter/nf_conntrack_ftp.h b/include/linux/netfilter/nf_conntrack_ftp.h
index ad4a41c..81453ea 100644
--- a/include/linux/netfilter/nf_conntrack_ftp.h
+++ b/include/linux/netfilter/nf_conntrack_ftp.h
@@ -3,16 +3,16 @@
 /* FTP tracking. */
 
 /* This enum is exposed to userspace */
-enum ip_ct_ftp_type
+enum nf_ct_ftp_type
 {
 	/* PORT command from client */
-	IP_CT_FTP_PORT,
+	NF_CT_FTP_PORT,
 	/* PASV response from server */
-	IP_CT_FTP_PASV,
+	NF_CT_FTP_PASV,
 	/* EPRT command from client */
-	IP_CT_FTP_EPRT,
+	NF_CT_FTP_EPRT,
 	/* EPSV response from server */
-	IP_CT_FTP_EPSV,
+	NF_CT_FTP_EPSV,
 };
 
 #ifdef __KERNEL__
@@ -21,23 +21,23 @@ enum ip_ct_ftp_type
 
 #define NUM_SEQ_TO_REMEMBER 2
 /* This structure exists only once per master */
-struct ip_ct_ftp_master {
+struct nf_ct_ftp_master {
 	/* Valid seq positions for cmd matching after newline */
 	u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
 	/* 0 means seq_match_aft_nl not set */
 	int seq_aft_nl_num[IP_CT_DIR_MAX];
 };
 
-struct ip_conntrack_expect;
+struct nf_conntrack_expect;
 
 /* For NAT to hook in when we find a packet which describes what other
  * connection we should expect. */
-extern unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
+extern unsigned int (*nf_nat_ftp_hook)(struct sk_buff **pskb,
 				       enum ip_conntrack_info ctinfo,
-				       enum ip_ct_ftp_type type,
+				       enum nf_ct_ftp_type type,
 				       unsigned int matchoff,
 				       unsigned int matchlen,
-				       struct ip_conntrack_expect *exp,
+				       struct nf_conntrack_expect *exp,
 				       u32 *seq);
 #endif /* __KERNEL__ */
 
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_ftp.h b/include/linux/netfilter_ipv4/ip_conntrack_ftp.h
index 6381193..2129fc3 100644
--- a/include/linux/netfilter_ipv4/ip_conntrack_ftp.h
+++ b/include/linux/netfilter_ipv4/ip_conntrack_ftp.h
@@ -1,6 +1,44 @@
 #ifndef _IP_CONNTRACK_FTP_H
 #define _IP_CONNTRACK_FTP_H
+/* FTP tracking. */
 
-#include <linux/netfilter/nf_conntrack_ftp.h>
+/* This enum is exposed to userspace */
+enum ip_ct_ftp_type
+{
+	/* PORT command from client */
+	IP_CT_FTP_PORT,
+	/* PASV response from server */
+	IP_CT_FTP_PASV,
+	/* EPRT command from client */
+	IP_CT_FTP_EPRT,
+	/* EPSV response from server */
+	IP_CT_FTP_EPSV,
+};
+
+#ifdef __KERNEL__
+
+#define FTP_PORT	21
+
+#define NUM_SEQ_TO_REMEMBER 2
+/* This structure exists only once per master */
+struct ip_ct_ftp_master {
+	/* Valid seq positions for cmd matching after newline */
+	u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
+	/* 0 means seq_match_aft_nl not set */
+	int seq_aft_nl_num[IP_CT_DIR_MAX];
+};
+
+struct ip_conntrack_expect;
+
+/* For NAT to hook in when we find a packet which describes what other
+ * connection we should expect. */
+extern unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
+				       enum ip_conntrack_info ctinfo,
+				       enum ip_ct_ftp_type type,
+				       unsigned int matchoff,
+				       unsigned int matchlen,
+				       struct ip_conntrack_expect *exp,
+				       u32 *seq);
+#endif /* __KERNEL__ */
 
 #endif /* _IP_CONNTRACK_FTP_H */