root/include/linux/netfilter/nf_conntrack_ftp.h

INCLUDED FROM

   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 */