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Linux/include/linux/netfilter/nf_conntrack_ftp.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _NF_CONNTRACK_FTP_H
  3 #define _NF_CONNTRACK_FTP_H
  4 
  5 #include <linux/netfilter.h>
  6 #include <linux/skbuff.h>
  7 #include <linux/types.h>
  8 #include <net/netfilter/nf_conntrack_expect.h>
  9 #include <uapi/linux/netfilter/nf_conntrack_ftp.h>
 10 #include <uapi/linux/netfilter/nf_conntrack_tuple_common.h>
 11 
 12 #define FTP_PORT        21
 13 
 14 #define NF_CT_FTP_SEQ_PICKUP    (1 << 0)
 15 
 16 #define NUM_SEQ_TO_REMEMBER 2
 17 /* This structure exists only once per master */
 18 struct nf_ct_ftp_master {
 19         /* Valid seq positions for cmd matching after newline */
 20         u_int32_t seq_aft_nl[IP_CT_DIR_MAX][NUM_SEQ_TO_REMEMBER];
 21         /* 0 means seq_match_aft_nl not set */
 22         u_int16_t seq_aft_nl_num[IP_CT_DIR_MAX];
 23         /* pickup sequence tracking, useful for conntrackd */
 24         u_int16_t flags[IP_CT_DIR_MAX];
 25 };
 26 
 27 /* For NAT to hook in when we find a packet which describes what other
 28  * connection we should expect. */
 29 extern unsigned int (*nf_nat_ftp_hook)(struct sk_buff *skb,
 30                                        enum ip_conntrack_info ctinfo,
 31                                        enum nf_ct_ftp_type type,
 32                                        unsigned int protoff,
 33                                        unsigned int matchoff,
 34                                        unsigned int matchlen,
 35                                        struct nf_conntrack_expect *exp);
 36 #endif /* _NF_CONNTRACK_FTP_H */
 37 

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