1 /* tcp_usrreq.c 1.37 81/11/29 */ 2 3 #include "../h/param.h" 4 #include "../h/systm.h" 5 #include "../h/mbuf.h" 6 #include "../h/socket.h" 7 #include "../h/socketvar.h" 8 #include "../h/protosw.h" 9 #include "../net/in.h" 10 #include "../net/in_pcb.h" 11 #include "../net/in_systm.h" 12 #include "../net/if.h" 13 #include "../net/ip.h" 14 #include "../net/ip_var.h" 15 #include "../net/tcp.h" 16 #include "../net/tcp_fsm.h" 17 #include "../net/tcp_seq.h" 18 #include "../net/tcp_timer.h" 19 #include "../net/tcp_var.h" 20 #include "../net/tcpip.h" 21 #include "../errno.h" 22 23 struct tcpcb *tcp_newtcpcb(); 24 /* 25 * Process a TCP user request for tcp tb. If this is a send request 26 * then m is the mbuf chain of send data. If this is a timer expiration 27 * (called from the software clock routine), then timertype tells which timer. 28 */ 29 tcp_usrreq(so, req, m, addr) 30 struct socket *so; 31 int req; 32 struct mbuf *m; 33 caddr_t addr; 34 { 35 register struct inpcb *inp = sotoinpcb(so); 36 register struct tcpcb *tp; 37 int s = splnet(); 38 int error = 0; 39 COUNT(TCP_USRREQ); 40 41 /* 42 * Make sure attached. If not, 43 * only PRU_ATTACH is valid. 44 */ 45 if (inp == 0 && req != PRU_ATTACH) { 46 splx(s); 47 return (EINVAL); 48 } 49 if (inp) { 50 tp = intotcpcb(inp); 51 #ifdef KPROF 52 tcp_acounts[tp->t_state][req]++; 53 #endif 54 } 55 switch (req) { 56 57 case PRU_ATTACH: 58 if (inp) { 59 error = EISCONN; 60 break; 61 } 62 error = in_pcballoc(so, &tcb, 2048, 2048, (struct sockaddr_in *)addr); 63 if (error) 64 break; 65 inp = (struct inpcb *)so->so_pcb; 66 if (so->so_options & SO_ACCEPTCONN) { 67 tp = tcp_newtcpcb(inp); 68 if (tp == 0) { 69 in_pcbfree(inp); 70 error = ENOBUFS; 71 break; 72 } 73 tp->t_state = TCPS_LISTEN; 74 } else 75 tp->t_state = TCPS_CLOSED; 76 break; 77 78 case PRU_DETACH: 79 break; 80 81 case PRU_CONNECT: 82 error = in_pcbsetpeer(inp, (struct sockaddr_in *)addr); 83 if (error) 84 break; 85 tp = tcp_newtcpcb(inp); 86 if (tp == 0) { 87 inp->inp_faddr.s_addr = 0; 88 error = ENOBUFS; 89 break; 90 } 91 tp->t_inpcb = inp; 92 inp->inp_ppcb = (caddr_t)tp; 93 soisconnecting(so); 94 tp->t_state = TCPS_SYN_SENT; 95 (void) tcp_output(tp); 96 break; 97 98 case PRU_ACCEPT: 99 soisconnected(so); 100 break; 101 102 case PRU_DISCONNECT: 103 if (tp->t_state < TCPS_ESTABLISHED) 104 tcp_close(tp); 105 else { 106 soisdisconnecting(so); 107 (void) tcp_output(tp); 108 } 109 break; 110 111 case PRU_SHUTDOWN: 112 socantsendmore(so); 113 switch (tp->t_state) { 114 115 case TCPS_LISTEN: 116 case TCPS_SYN_SENT: 117 tp->t_state = TCPS_CLOSED; 118 break; 119 120 case TCPS_SYN_RECEIVED: 121 case TCPS_ESTABLISHED: 122 tp->t_state = TCPS_FIN_WAIT_1; 123 (void) tcp_output(tp); 124 break; 125 126 case TCPS_CLOSE_WAIT: 127 tp->t_state = TCPS_LAST_ACK; 128 (void) tcp_output(tp); 129 break; 130 } 131 break; 132 133 case PRU_RCVD: 134 (void) tcp_output(tp); 135 break; 136 137 case PRU_SEND: 138 sbappend(&so->so_snd, m); 139 /* 140 if (tp->t_flags & TF_PUSH) 141 tp->snd_end = tp->snd_una + so->so_snd.sb_cc; 142 */ 143 if (tp->t_flags & TF_URG) 144 tp->snd_up = tp->snd_una + so->so_snd.sb_cc + 1; 145 (void) tcp_output(tp); 146 break; 147 148 case PRU_ABORT: 149 tcp_drop(tp, ECONNABORTED); 150 break; 151 152 case PRU_CONTROL: 153 error = EOPNOTSUPP; 154 break; 155 156 case PRU_SENSE: 157 error = EOPNOTSUPP; 158 break; 159 160 case PRU_RCVOOB: 161 error = EOPNOTSUPP; 162 break; 163 164 case PRU_SENDOOB: 165 error = EOPNOTSUPP; 166 break; 167 168 case PRU_SLOWTIMO: 169 tcp_timers(tp, (int)addr); 170 break; 171 172 default: 173 panic("tcp_usrreq"); 174 } 175 splx(s); 176 return (error); 177 } 178