diff options
Diffstat (limited to 'plugins/vcgn-plugin/vcgn/cnat_v4_ftp_alg.h')
| -rw-r--r-- | plugins/vcgn-plugin/vcgn/cnat_v4_ftp_alg.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/plugins/vcgn-plugin/vcgn/cnat_v4_ftp_alg.h b/plugins/vcgn-plugin/vcgn/cnat_v4_ftp_alg.h new file mode 100644 index 00000000000..df3dfcb0797 --- /dev/null +++ b/plugins/vcgn-plugin/vcgn/cnat_v4_ftp_alg.h @@ -0,0 +1,133 @@ +/* + *------------------------------------------------------------------ + * 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__ */ |