tap-tcp-stream.h

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#ifndef __TAP_TCP_STREAM_H__
#define __TAP_TCP_STREAM_H__
 
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

typedef enum tcp_graph_type_ {
    GRAPH_TSEQ_STEVENS,  
    GRAPH_TSEQ_TCPTRACE, 
    GRAPH_THROUGHPUT,    
    GRAPH_RTT,           
    GRAPH_WSCALE,        
    GRAPH_UNDEFINED      
} tcp_graph_type;

#define RTT_ALL  0x0001
#define RTT_SAK  0x0002
#define RTT_RTT  0x0004
#define RTT_KRN  0x0008

typedef enum rtt_sampling_method_ {
    SAMPLING_ALL,       
    SAMPLING_ALL_SACK,  
    SAMPLING_RTT,       
    SAMPLING_KARN,      
    SAMPLING_UNDEFINED  
} rtt_sampling_method;

struct segment {
    struct segment *next;       
    uint32_t        num;        
    nstime_t        rel_ts;     
 
    uint32_t th_seq;            
    uint32_t th_ack;            
    uint32_t th_rawseq;         
    uint32_t th_rawack;         
    uint16_t th_flags;          
    uint32_t th_win;            
    uint32_t th_seglen;         
    uint16_t th_sport;          
    uint16_t th_dport;          
    address  ip_src;            
    address  ip_dst;            
 
    bool    ack_karn;           
 
    uint8_t  num_sack_ranges;                        
    uint32_t sack_left_edge[MAX_TCP_SACK_RANGES];    
    uint32_t sack_right_edge[MAX_TCP_SACK_RANGES];   
};

struct tcp_graph {
    tcp_graph_type  type;          
 
    uint8_t         rtt_sampling;  
 
    /* --- Stream identity --- */
    address  src_address; 
    uint16_t src_port;    
    address  dst_address; 
    uint16_t dst_port;    
    uint32_t stream;      
 
    /* --- Segment list --- */
    struct segment *segments; 
    struct segment *last;     
};

void graph_segment_list_get(capture_file *cf, struct tcp_graph *tg);

void graph_segment_list_free(struct tcp_graph *tg);
 
/* for compare_headers() */
/* segment went the same direction as the currently selected one */
#define COMPARE_CURR_DIR    0
#define COMPARE_ANY_DIR     1

int compare_headers(address *saddr1, address *daddr1, uint16_t sport1, uint16_t dport1, const address *saddr2, const address *daddr2, uint16_t sport2, uint16_t dport2, int dir);

int get_num_dsegs(struct tcp_graph *tg);

int get_num_acks(struct tcp_graph *tg, int *num_sack_ranges);

uint32_t select_tcpip_session(capture_file *cf);

struct rtt_unack {
    struct rtt_unack *next;      
    double            time;      
    unsigned int      seqno;     
    unsigned int      end_seqno; 
};

bool rtt_is_retrans(struct rtt_unack *list, unsigned int seqno);

struct rtt_unack *rtt_get_new_unack(double time_val, unsigned int seqno, unsigned int seglen);

void rtt_put_unack_on_list(struct rtt_unack **l, struct rtt_unack *new_unack);

void rtt_delete_unack_from_list(struct rtt_unack **l, struct rtt_unack *dead);

void rtt_destroy_unack_list(struct rtt_unack **l);

static inline int
tcp_seq_eq(uint32_t s1, uint32_t s2) {
    return (int32_t)(s1 - s2) == 0;
}

static inline int
tcp_seq_before(uint32_t s1, uint32_t s2) {
    return (int32_t)(s1 - s2) < 0;
}

static inline int
tcp_seq_eq_or_after(uint32_t s1, uint32_t s2) {
    return !tcp_seq_before(s1, s2);
}

static inline int
tcp_seq_after(uint32_t s1, uint32_t s2) {
    return (int32_t)(s1 - s2) > 0;
}

static inline int
tcp_seq_before_or_eq(uint32_t s1, uint32_t s2) {
    return !tcp_seq_after(s1, s2);
}
 
#ifdef __cplusplus
}
#endif /* __cplusplus */
 
#endif /* __TAP_TCP_STREAM_H__ */