267 lines
7.4 KiB
C
267 lines
7.4 KiB
C
/*
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tcp_int.h
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Copyright 1995 Philip Homburg
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*/
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#ifndef TCP_INT_H
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#define TCP_INT_H
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#define IP_TCP_MIN_HDR_SIZE (IP_MIN_HDR_SIZE+TCP_MIN_HDR_SIZE)
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#define TCP_CONN_HASH_SHIFT 4
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#define TCP_CONN_HASH_NR (1 << TCP_CONN_HASH_SHIFT)
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typedef struct tcp_port
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{
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int tp_ipdev;
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int tp_flags;
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int tp_state;
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int tp_ipfd;
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acc_t *tp_pack;
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ipaddr_t tp_ipaddr;
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ipaddr_t tp_subnetmask;
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u16_t tp_mtu;
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struct tcp_conn *tp_snd_head;
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struct tcp_conn *tp_snd_tail;
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event_t tp_snd_event;
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struct tcp_conn *tp_conn_hash[TCP_CONN_HASH_NR][4];
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} tcp_port_t;
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#define TPF_EMPTY 0x0
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#define TPF_SUSPEND 0x1
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#define TPF_READ_IP 0x2
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#define TPF_READ_SP 0x4
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#define TPF_WRITE_IP 0x8
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#define TPF_WRITE_SP 0x10
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#define TPF_DELAY_TCP 0x40
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#define TPS_EMPTY 0
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#define TPS_SETPROTO 1
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#define TPS_GETCONF 2
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#define TPS_MAIN 3
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#define TPS_ERROR 4
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#define TFL_LISTEN_MAX 5
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typedef struct tcp_fd
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{
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unsigned long tf_flags;
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tcp_port_t *tf_port;
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int tf_srfd;
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ioreq_t tf_ioreq;
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nwio_tcpconf_t tf_tcpconf;
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nwio_tcpopt_t tf_tcpopt;
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get_userdata_t tf_get_userdata;
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put_userdata_t tf_put_userdata;
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select_res_t tf_select_res;
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struct tcp_conn *tf_conn;
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struct tcp_conn *tf_listenq[TFL_LISTEN_MAX];
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size_t tf_write_offset;
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size_t tf_write_count;
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size_t tf_read_offset;
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size_t tf_read_count;
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int tf_error; /* Error for nonblocking connect */
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tcp_cookie_t tf_cookie;
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} tcp_fd_t;
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#define TFF_EMPTY 0x0
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#define TFF_INUSE 0x1
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#define TFF_READ_IP 0x2
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#define TFF_WRITE_IP 0x4
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#define TFF_IOCTL_IP 0x8
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#define TFF_CONF_SET 0x10
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#define TFF_IOC_INIT_SP 0x20
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#define TFF_LISTENQ 0x40
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#define TFF_CONNECTING 0x80
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#define TFF_CONNECTED 0x100
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#define TFF_WR_URG 0x200
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#define TFF_PUSH_DATA 0x400
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#define TFF_RECV_URG 0x800
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#define TFF_SEL_READ 0x1000
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#define TFF_SEL_WRITE 0x2000
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#define TFF_SEL_EXCEPT 0x4000
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#define TFF_DEL_RST 0x8000
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#define TFF_COOKIE 0x10000
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typedef struct tcp_conn
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{
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int tc_flags;
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int tc_state;
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int tc_busy; /* do not steal buffer when a connection is
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* busy
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*/
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tcp_port_t *tc_port;
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tcp_fd_t *tc_fd;
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tcpport_t tc_locport;
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ipaddr_t tc_locaddr;
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tcpport_t tc_remport;
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ipaddr_t tc_remaddr;
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int tc_connInprogress;
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int tc_orglisten;
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clock_t tc_senddis;
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/* Sending side */
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u32_t tc_ISS; /* initial sequence number */
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u32_t tc_SND_UNA; /* least unacknowledged sequence number */
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u32_t tc_SND_TRM; /* next sequence number to be transmitted */
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u32_t tc_SND_NXT; /* next sequence number for new data */
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u32_t tc_SND_UP; /* urgent pointer, first sequence number not
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* urgent */
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u32_t tc_SND_PSH; /* push pointer, data should be pushed until
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* the push pointer is reached */
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u32_t tc_snd_cwnd; /* highest sequence number to be sent */
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u32_t tc_snd_cthresh; /* threshold for send window */
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u32_t tc_snd_cinc; /* increment for send window threshold */
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u16_t tc_snd_wnd; /* max send queue size */
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u16_t tc_snd_dack; /* # of duplicate ACKs */
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/* round trip calculation. */
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clock_t tc_rt_time;
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u32_t tc_rt_seq;
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u32_t tc_rt_threshold;
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clock_t tc_artt; /* Avg. retransmission time. Scaled. */
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clock_t tc_drtt; /* Diviation, also scaled. */
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clock_t tc_rtt; /* Computed retrans time */
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acc_t *tc_send_data;
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acc_t *tc_frag2send;
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struct tcp_conn *tc_send_link;
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/* Receiving side */
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u32_t tc_IRS;
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u32_t tc_RCV_LO;
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u32_t tc_RCV_NXT;
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u32_t tc_RCV_HI;
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u32_t tc_RCV_UP;
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u16_t tc_rcv_wnd;
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acc_t *tc_rcvd_data;
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acc_t *tc_adv_data;
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u32_t tc_adv_seq;
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/* Keep alive. Record SDN_NXT and RCV_NXT in tc_ka_snd and
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* tc_ka_rcv when setting the keepalive timer to detect
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* any activity that may have happend before the timer
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* expired.
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*/
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u32_t tc_ka_snd;
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u32_t tc_ka_rcv;
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clock_t tc_ka_time;
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acc_t *tc_remipopt;
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acc_t *tc_tcpopt;
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u8_t tc_tos;
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u8_t tc_ttl;
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u16_t tc_max_mtu; /* Max. negotiated (or selected) MTU */
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u16_t tc_mtu; /* discovered PMTU */
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clock_t tc_mtutim; /* Last time MTU/TCF_PMTU flag was changed */
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struct timer tc_transmit_timer;
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u32_t tc_transmit_seq;
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clock_t tc_0wnd_to;
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clock_t tc_stt; /* time of first send after last ack */
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clock_t tc_rt_dead;
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int tc_error;
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int tc_inconsistent;
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} tcp_conn_t;
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#define TCF_EMPTY 0x0
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#define TCF_INUSE 0x1
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#define TCF_FIN_RECV 0x2
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#define TCF_RCV_PUSH 0x4
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#define TCF_MORE2WRITE 0x8
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#define TCF_SEND_ACK 0x10
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#define TCF_FIN_SENT 0x20
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#define TCF_BSD_URG 0x40
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#define TCF_NO_PUSH 0x80
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#define TCF_PUSH_NOW 0x100
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#define TCF_PMTU 0x200
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#if DEBUG & 0x200
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#define TCF_DEBUG 0x1000
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#endif
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#define TCS_CLOSED 0
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#define TCS_LISTEN 1
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#define TCS_SYN_RECEIVED 2
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#define TCS_SYN_SENT 3
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#define TCS_ESTABLISHED 4
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#define TCS_CLOSING 5
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/* tcp_recv.c */
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void tcp_frag2conn ARGS(( tcp_conn_t *tcp_conn, ip_hdr_t *ip_hdr,
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tcp_hdr_t *tcp_hdr, acc_t *tcp_data, size_t data_len ));
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void tcp_fd_read ARGS(( tcp_conn_t *tcp_conn, int enq ));
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unsigned tcp_sel_read ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_rsel_read ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_bytesavailable ARGS(( tcp_fd_t *tcp_fd, int *bytesp ));
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/* tcp_send.c */
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void tcp_conn_write ARGS(( tcp_conn_t *tcp_conn, int enq ));
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void tcp_release_retrans ARGS(( tcp_conn_t *tcp_conn, u32_t seg_ack,
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U16_t new_win ));
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void tcp_fast_retrans ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_set_send_timer ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_fd_write ARGS(( tcp_conn_t *tcp_conn ));
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unsigned tcp_sel_write ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_rsel_write ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_close_connection ARGS(( tcp_conn_t *tcp_conn,
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int error ));
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void tcp_port_write ARGS(( tcp_port_t *tcp_port ));
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void tcp_shutdown ARGS(( tcp_conn_t *tcp_conn ));
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/* tcp_lib.c */
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void tcp_extract_ipopt ARGS(( tcp_conn_t *tcp_conn,
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ip_hdr_t *ip_hdr ));
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void tcp_extract_tcpopt ARGS(( tcp_conn_t *tcp_conn,
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tcp_hdr_t *tcp_hdr, size_t *mssp ));
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void tcp_get_ipopt ARGS(( tcp_conn_t *tcp_conn, ip_hdropt_t
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*ip_hdropt ));
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void tcp_get_tcpopt ARGS(( tcp_conn_t *tcp_conn, tcp_hdropt_t
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*tcp_hdropt ));
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acc_t *tcp_make_header ARGS(( tcp_conn_t *tcp_conn,
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ip_hdr_t **ref_ip_hdr, tcp_hdr_t **ref_tcp_hdr, acc_t *data ));
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u16_t tcp_pack_oneCsum ARGS(( ip_hdr_t *ip_hdr, acc_t *tcp_pack ));
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int tcp_check_conn ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_print_pack ARGS(( ip_hdr_t *ip_hdr, tcp_hdr_t *tcp_hdr ));
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void tcp_print_state ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_print_conn ARGS(( tcp_conn_t *tcp_conn ));
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int tcp_LEmod4G ARGS(( u32_t n1, u32_t n2 ));
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int tcp_Lmod4G ARGS(( u32_t n1, u32_t n2 ));
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int tcp_GEmod4G ARGS(( u32_t n1, u32_t n2 ));
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int tcp_Gmod4G ARGS(( u32_t n1, u32_t n2 ));
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/* tcp.c */
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void tcp_restart_connect ARGS(( tcp_conn_t *tcp_conn ));
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int tcp_su4listen ARGS(( tcp_fd_t *tcp_fd, tcp_conn_t *tcp_conn,
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int do_listenq ));
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void tcp_reply_ioctl ARGS(( tcp_fd_t *tcp_fd, int reply ));
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void tcp_reply_write ARGS(( tcp_fd_t *tcp_fd, size_t reply ));
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void tcp_reply_read ARGS(( tcp_fd_t *tcp_fd, size_t reply ));
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void tcp_notreach ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_mtu_exceeded ARGS(( tcp_conn_t *tcp_conn ));
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void tcp_mtu_incr ARGS(( tcp_conn_t *tcp_conn ));
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#define TCP_FD_NR (10*IP_PORT_MAX)
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#define TCP_CONN_NR (2*TCP_FD_NR)
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EXTERN tcp_port_t *tcp_port_table;
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EXTERN tcp_conn_t tcp_conn_table[TCP_CONN_NR];
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EXTERN tcp_fd_t tcp_fd_table[TCP_FD_NR];
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#define tcp_Lmod4G(n1,n2) (!!(((n1)-(n2)) & 0x80000000L))
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#define tcp_GEmod4G(n1,n2) (!(((n1)-(n2)) & 0x80000000L))
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#define tcp_Gmod4G(n1,n2) (!!(((n2)-(n1)) & 0x80000000L))
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#define tcp_LEmod4G(n1,n2) (!(((n2)-(n1)) & 0x80000000L))
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#endif /* TCP_INT_H */
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/*
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* $PchId: tcp_int.h,v 1.17 2005/06/28 14:21:08 philip Exp $
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*/
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