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authorJozsef Kadlecsik <kadlec@blackhole.kfki.hu>2006-12-02 22:07:44 -0800
committerDavid S. Miller <davem@davemloft.net>2006-12-02 22:07:44 -0800
commit55a733247d6d2883d9bb77825fafac3dfca13fc2 (patch)
treee16357243c80ca11fe84639fc84f92e653eb3079 /include/linux/netfilter_ipv4
parent5b1158e909ecbe1a052203e0d8df15633f829930 (diff)
[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>
Diffstat (limited to 'include/linux/netfilter_ipv4')
-rw-r--r--include/linux/netfilter_ipv4/ip_conntrack_ftp.h40
1 files changed, 39 insertions, 1 deletions
diff --git a/include/linux/netfilter_ipv4/ip_conntrack_ftp.h b/include/linux/netfilter_ipv4/ip_conntrack_ftp.h
index 63811934de4..2129fc3972a 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 */