1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
|
/*
*------------------------------------------------------------------
* cnat_v4_ftp_alg.h
*
* Copyright (c) 2012-2013 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*------------------------------------------------------------------
*/
#ifndef __CNAT_V4_FTP_ALG_H__
#define __CNAT_V4_FTP_ALG_H__
#include <vlib/vlib.h>
#include <vnet/vnet.h>
#include "tcp_header_definitions.h"
#include "dslite_defs.h"
#include "dslite_db.h"
/* shorter form of byte order functions */
#define net2host16(x) clib_net_to_host_u16( x)
#define net2host32(x) clib_net_to_host_u32( x)
#define net2host64(x) clib_net_to_host_u64( x)
#define host2net16(x) clib_host_to_net_u16(x)
#define host2net32(x) clib_host_to_net_u32(x)
#define host2net64(x) clib_host_to_net_u64(x)
//#define BIGENDIAN
typedef struct iphdrtype_ {
u8 v_ihl; /* version and IP header length */
u8 tos; /* type of service */
u16 tl; /* total length */
u16 id; /* identifier */
u16 ipreserved: 1;
u16 dontfragment: 1;
u16 morefragments: 1;
u16 fo: 13; /* fragment offset */
u8 ttl; /* time to live */
u8 prot; /* protocol type */
u16 checksum; /* checksum */
u32 srcadr; /* IP source address */
u32 dstadr; /* IP destination address */
} iphdrtype;
typedef struct tcptype_ {
u16 sourceport;
u16 destinationport;
u32 sequencenumber;
u32 acknowledgementnumber;
u8 dataoffset;
u8 flags;
#if 0
/* bypass the ENDIAN part */
#ifdef BIGENDIAN
u8 reserved: 2;
u8 urg: 1;
u8 ack: 1;
u8 psh: 1;
u8 rst: 1;
u8 syn: 1;
u8 fin: 1;
#else
u8 fin: 1;
u8 syn: 1;
u8 rst: 1;
u8 psh: 1;
u8 ack: 1;
u8 urg: 1;
u8 reserved2: 2;
#endif
#endif
u16 window;
u16 checksum;
u16 urgentpointer;
u8 data[0];
} tcptype ;
int watch_ftp_port_cmd (iphdrtype *ip,
tcptype *tcp,
u32 * ip_addr,
u16 * port);
u8 * ftp_test_pkt_gen (u32 ip_addr, u16 port);
int update_ftp_port(u8 * pkt, u32 new_ip, u16 new_port, i8 * delta,
cnat_main_db_entry_t *db_tcp_control,
dslite_table_entry_t *dslite_entry_ptr,
ipv6_header_t *ipv6_hdr);
/*
* caller needs to check if it's a ftp packet
* this function returns 1
* if packet being updated for PORT
* otherwise return 0.
* Assume IP header DOES NOT have option fields
*/
int cnat_ftp_alg ( u8* pkt, i8 * delta, cnat_main_db_entry_t *db,
dslite_table_entry_t *dslite_entry_ptr,
ipv6_header_t *ipv6_hdr);
#define FTP_ALG_DEBUG_PRINTF_ENABLED 1
#ifdef FTP_ALG_DEBUG_PRINTF_ENABLED
#define FTP_ALG_DEBUG_PRINTF(...) { \
if (global_debug_flag & CNAT_DEBUG_FTP_ALG) { \
printf(__VA_ARGS__); \
} }
#else
#define FTP_ALG_DEBUG_PRINTF(...)
#endif
#endif /* __CNAT_V4_FTP_ALG_H__ */
|
