/******************************************************************************
Author: Samuel Jero
-Date: 2/2011
+Date: 7/2011
Description: Header file for program to convert a DCCP flow to a TCP flow for DCCP
analysis via tcptrace.
Notes:
- 1)Supports only a single DCCP contection per capture
- 2)Source Port!=Destination Port
- 3)DCCP MUST use 48 bit sequence numbers
- 4)Checksums are not computed (they are zeroed)
- 5)Only implements those packet types normally used in a session
- 6)DCCP Ack packets show up as TCP packets containing one byte
- 7)Very little error checking of packet headers
+ 1)CCID2 ONLY
+ 2)DCCP MUST use 48 bit sequence numbers
+ 3)Checksums are not computed (they are zeroed)
+ 4)Only implements those packet types normally used in a session
+ 5)DCCP Ack packets show up as TCP packets containing one byte
+ 6)Very little error checking of packet headers
******************************************************************************/
#ifndef _DCCP2TCP_H
#define _DCCP2TCP_H
#define MAX_PACKET 1600 /*Maximum size of TCP packet */
-#define TBL_SZ 10000 /*Size of Sequence Number Table*/
+#define TBL_SZ 40000 /*Size of Sequence Number Table*/
-/*sequence number structure--one per side of the connection */
-struct seq_num{
- int cur; /*current sequence number */
- __be16 addr; /*connection half id---source port */
- struct tbl *table; /*sequence number table */
- int size; /*sequence number table size */
+
+/*Packet structure*/
+struct packet{
+ struct pcap_pkthdr *h; /*libpcap header*/
+ u_char *data; /*Packet Data*/
+ int length; /*Packet length*/
+ uint32_t src_id; /*Source ID of packet*/
+ uint32_t dest_id; /*Destination ID of packet*/
+};
+
+/*Constant Packet structure*/
+struct const_packet{
+ const struct pcap_pkthdr *h; /*libpcap header*/
+ const u_char *data; /*Packet Data*/
+ int length; /*Packet length*/
+ uint32_t src_id; /*Source ID of packet*/
+ uint32_t dest_id;/*Destination ID of packet*/
+};
+
+/*Connection states*/
+enum con_state{
+ INIT,
+ OPEN,
+ CLOSE,
+};
+
+/*Host---half of a connection*/
+struct host{
+ uint32_t id; /*Host ID*/
+ __be16 port; /*Host DCCP port*/
+ struct tbl *table; /*Host Sequence Number Table*/
+ int size; /*Size of Sequence Number Table*/
+ int cur; /*Current TCP Sequence Number*/
+ enum con_state state; /*Connection state*/
+};
+
+/*Connection structure*/
+struct connection{
+ struct connection *next; /*List pointer*/
+ struct host A; /*Host A*/
+ struct host B; /*Host B*/
};
/*sequence number table structure */
struct tbl{
- __be32 old; /*DCCP sequence number */
- u_int32_t new; /*TCP sequence number */
- int size; /*packet size*/
- enum dccp_pkt_type type; /*packet type*/
+ __be32 old; /*DCCP sequence number */
+ u_int32_t new; /*TCP sequence number */
+ int size; /*packet size*/
+ enum dccp_pkt_type type; /*packet type*/
};
/*Option flags*/
extern int debug; /*set to 1 to turn on debugging information*/
-extern int yellow; /*tcptrace yellow line as currently acked packet*/
+extern int yellow; /*tcptrace yellow line as currently acked packet*/
extern int green; /*tcptrace green line as currently acked packet*/
extern int sack; /*add TCP SACKS*/
-/*Half Connection Structures*/
-extern struct seq_num *s1; /*sequence number structure for side one of connection*/
-extern struct seq_num *s2; /*sequence number structure for side two of connection*/
+extern struct connection *chead;/*connection list*/
/*debug printf
*/
void dbgprintf(int level, const char *fmt, ...);
+/*Function to parse encapsulation*/
+int do_encap(int link, struct packet *new, const struct const_packet *old);
+
+/*Connection functions*/
+int get_host(uint32_t src_id, uint32_t dest_id, int src_port, int dest_port, struct host **fwd, struct host **rev);
+struct connection *add_connection(uint32_t src_id, uint32_t dest_id, int src_port, int dest_port);
+int update_state(struct host* hst, enum con_state st);
+void cleanup_connections();
#endif