1*5092Swnj /* tcp_var.h 4.9 81/11/26 */ 24808Swnj 34808Swnj /* 44808Swnj * Kernel variables for tcp. 54808Swnj */ 64808Swnj 74808Swnj /* 84808Swnj * Tcp control block. 94808Swnj */ 104881Swnj struct tcpcb { 115076Swnj struct tcpiphdr *seg_next; /* sequencing queue */ 125076Swnj struct tcpiphdr *seg_prev; 135076Swnj int t_state; /* state of this connection */ 14*5092Swnj int t_seqcnt; /* count of chars in seq queue */ 15*5092Swnj short t_timer[TCPT_NTIMERS]; /* tcp timers */ 16*5092Swnj struct mbuf *t_tcpopt; /* tcp options */ 17*5092Swnj struct mbuf *t_ipopt; /* ip options */ 18*5092Swnj short t_maxseg; /* maximum segment size */ 195067Swnj u_char t_flags; 20*5092Swnj #define TF_ACKNOW 0x01 /* ack peer immediately */ 21*5092Swnj #define TF_DELACK 0x02 /* ack, but try to delay it */ 22*5092Swnj #define TF_PUSH 0x04 /* push mode */ 23*5092Swnj #define TF_URG 0x08 /* urgent mode */ 24*5092Swnj #define TF_KEEP 0x10 /* use keep-alives */ 254881Swnj struct tcpiphdr *t_template; /* skeletal packet for transmit */ 265067Swnj struct inpcb *t_inpcb; /* back pointer to internet pcb */ 274808Swnj /* 285067Swnj * The following fields are used as in the protocol specification. 295067Swnj * See RFC783, Dec. 1981, page 21. 304808Swnj */ 315067Swnj /* send sequence variables */ 325067Swnj tcp_seq snd_una; /* send unacknowledged */ 335067Swnj tcp_seq snd_nxt; /* send next */ 345067Swnj u_short snd_wnd; /* send window */ 355067Swnj tcp_seq snd_up; /* send urgent pointer */ 365067Swnj tcp_seq snd_wl1; /* window update seg seq number */ 375067Swnj tcp_seq snd_wl2; /* window update seg ack number */ 385067Swnj tcp_seq iss; /* initial send sequence number */ 395067Swnj /* receive sequence variables */ 405067Swnj tcp_seq rcv_nxt; /* receive next */ 415067Swnj u_short rcv_wnd; /* receive window */ 425067Swnj tcp_seq rcv_up; /* receive urgent pointer */ 435067Swnj tcp_seq irs; /* initial receive sequence number */ 445067Swnj /* 455067Swnj * Additional variables for this implementation. 465067Swnj */ 475076Swnj /* receive variables */ 485076Swnj tcp_seq rcv_adv; /* advertised window */ 495067Swnj /* retransmit variables */ 50*5092Swnj tcp_seq snd_max; /* highest sequence number sent 515076Swnj used to recognize retransmits */ 52*5092Swnj tcp_seq rxt_seq; 53*5092Swnj short rxt_time; 54*5092Swnj short rxt_cnt; 555067Swnj }; 564808Swnj 57*5092Swnj #define tcp_finisacked(tp) 0 /* XXX */ 58*5092Swnj 594881Swnj #define intotcpcb(ip) ((struct tcpcb *)(ip)->inp_ppcb) 604881Swnj #define sototcpcb(so) (intotcpcb(sotoinpcb(so))) 614881Swnj 62*5092Swnj #define TCP_ISSINCR 128 /* increment for iss each second */ 634808Swnj 644926Swnj struct tcpstat { 654926Swnj int tcps_badsum; 664926Swnj int tcps_badoff; 674926Swnj int tcps_hdrops; 684926Swnj int tcps_badsegs; 694926Swnj int tcps_unack; 704926Swnj }; 714926Swnj 724808Swnj #ifdef KERNEL 735067Swnj struct inpcb tcb; /* head of queue of active tcpcb's */ 745067Swnj struct tcpstat tcpstat; /* tcp statistics */ 754881Swnj struct tcpiphdr *tcp_template(); 764808Swnj #endif 77