1 /******************************************************************************
2 Utility to convert a DCCP flow to a TCP flow for DCCP analysis via
5 Copyright (C) 2012 Samuel Jero <sj323707@ohio.edu>
7 This program is free software: you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation, either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 Author: Samuel Jero <sj323707@ohio.edu>
25 2)DCCP MUST use 48 bit sequence numbers
26 3)Checksums are not computed (they are zeroed)
27 4)DCCP DATA packets are not implemented (Linux doesn't use them)
28 5)DCCP Ack packets show up as TCP packets containing one byte
29 ******************************************************************************/
38 #include <sys/types.h>
42 #include <sys/socket.h>
44 #include <netinet/in.h>
45 #include <netinet/in_systm.h>
46 #include <arpa/inet.h>
47 #include <netinet/if_ether.h>
48 #include <netinet/ip.h>
49 #include <netinet/tcp.h>
50 #include <netinet/tcp.h>
51 #include <netinet/udp.h>
55 #include <linux/dccp.h>
58 #define MAX_PACKET 1600 /*Maximum size of TCP packet */
59 #define TBL_SZ 40000 /*Size of Sequence Number Table*/
66 struct pcap_pkthdr *h; /*libpcap header*/
67 u_char *data; /*Packet Data*/
68 int length; /*Packet length*/
69 int id_len; /*Length of IDs*/
70 u_char *src_id; /*Source ID of packet*/
71 u_char *dest_id;/*Destination ID of packet*/
74 /*Constant Packet structure*/
76 const struct pcap_pkthdr *h; /*libpcap header*/
77 const u_char *data; /*Packet Data*/
78 int length; /*Packet length*/
79 int id_len; /*Length of IDs*/
80 u_char *src_id; /*Source ID of packet*/
81 u_char *dest_id;/*Destination ID of packet*/
91 /*Connection Types (i.e. CCID)*/
98 /*Host---half of a connection*/
100 int id_len; /*Length of ID*/
101 u_char *id; /*Host ID*/
102 __be16 port; /*Host DCCP port*/
103 struct tbl *table; /*Host Sequence Number Table*/
104 int size; /*Size of Sequence Number Table*/
105 int cur; /*Current TCP Sequence Number*/
106 enum con_state state; /*Connection state*/
107 enum con_type type; /*Connection type*/
110 /*Connection structure*/
112 struct connection *next; /*List pointer*/
113 struct host A; /*Host A*/
114 struct host B; /*Host B*/
117 /*sequence number table structure */
119 __be32 old; /*DCCP sequence number */
120 u_int32_t new; /*TCP sequence number */
121 int size; /*packet size*/
122 enum dccp_pkt_type type; /*packet type*/
126 extern int debug; /*set to 1 to turn on debugging information*/
127 extern int yellow; /*tcptrace yellow line as currently acked packet*/
128 extern int green; /*tcptrace green line as currently acked packet*/
129 extern int sack; /*add TCP SACKS*/
131 extern struct connection *chead;/*connection list*/
135 * 0) Always print even if debug isn't specified
136 * 1) Errors and warnings... Don't overload the screen with too much output
137 * 2) Notes and per-packet processing info... as verbose as needed
139 void dbgprintf(int level, const char *fmt, ...);
141 /*Function to parse encapsulation*/
142 int do_encap(int link, struct packet *new, const struct const_packet *old);
144 /*Connection functions*/
145 int get_host(u_char *src_id, u_char* dest_id, int id_len, int src_port, int dest_port,
146 struct host **fwd, struct host **rev);
147 struct connection *add_connection(u_char *src_id, u_char* dest_id, int id_len,
148 int src_port, int dest_port);
149 int update_state(struct host* hst, enum con_state st);
150 void cleanup_connections();
152 /*Per-CCID convert functions*/
153 int ccid2_convert_packet(struct packet *new, const struct const_packet* old);