+int
+tcp_ctloutput(op, so, level, optname, mp)
+ int op;
+ struct socket *so;
+ int level, optname;
+ struct mbuf **mp;
+{
+ int error = 0, s;
+ struct inpcb *inp;
+ register struct tcpcb *tp;
+ register struct mbuf *m;
+ register int i;
+
+ s = splnet();
+ inp = sotoinpcb(so);
+ if (inp == NULL) {
+ splx(s);
+ if (op == PRCO_SETOPT && *mp)
+ (void) m_free(*mp);
+ return (ECONNRESET);
+ }
+ if (level != IPPROTO_TCP) {
+ error = ip_ctloutput(op, so, level, optname, mp);
+ splx(s);
+ return (error);
+ }
+ tp = intotcpcb(inp);
+
+ switch (op) {
+
+ case PRCO_SETOPT:
+ m = *mp;
+ switch (optname) {
+
+ case TCP_NODELAY:
+ if (m == NULL || m->m_len < sizeof (int))
+ error = EINVAL;
+ else if (*mtod(m, int *))
+ tp->t_flags |= TF_NODELAY;
+ else
+ tp->t_flags &= ~TF_NODELAY;
+ break;
+
+ case TCP_MAXSEG:
+ if (m && (i = *mtod(m, int *)) > 0 && i <= tp->t_maxseg)
+ tp->t_maxseg = i;
+ else
+ error = EINVAL;
+ break;
+
+ default:
+ error = ENOPROTOOPT;
+ break;
+ }
+ if (m)
+ (void) m_free(m);
+ break;
+
+ case PRCO_GETOPT:
+ *mp = m = m_get(M_WAIT, MT_SOOPTS);
+ m->m_len = sizeof(int);
+
+ switch (optname) {
+ case TCP_NODELAY:
+ *mtod(m, int *) = tp->t_flags & TF_NODELAY;
+ break;
+ case TCP_MAXSEG:
+ *mtod(m, int *) = tp->t_maxseg;
+ break;
+ default:
+ error = ENOPROTOOPT;
+ break;
+ }
+ break;
+ }
+ splx(s);
+ return (error);
+}
+
+u_long tcp_sendspace = 1024*8;
+u_long tcp_recvspace = 1024*8;
+
+/*
+ * Attach TCP protocol to socket, allocating
+ * internet protocol control block, tcp control block,
+ * bufer space, and entering LISTEN state if to accept connections.
+ */
+int
+tcp_attach(so)
+ struct socket *so;
+{
+ register struct tcpcb *tp;
+ struct inpcb *inp;
+ int error;
+
+ if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
+ error = soreserve(so, tcp_sendspace, tcp_recvspace);
+ if (error)
+ return (error);
+ }
+ error = in_pcballoc(so, &tcb);
+ if (error)
+ return (error);
+ inp = sotoinpcb(so);
+ tp = tcp_newtcpcb(inp);
+ if (tp == 0) {
+ int nofd = so->so_state & SS_NOFDREF; /* XXX */
+
+ so->so_state &= ~SS_NOFDREF; /* don't free the socket yet */
+ in_pcbdetach(inp);
+ so->so_state |= nofd;
+ return (ENOBUFS);
+ }
+ tp->t_state = TCPS_CLOSED;
+ return (0);
+}
+
+/*
+ * Initiate (or continue) disconnect.
+ * If embryonic state, just send reset (once).
+ * If in ``let data drain'' option and linger null, just drop.
+ * Otherwise (hard), mark socket disconnecting and drop
+ * current input data; switch states based on user close, and
+ * send segment to peer (with FIN).
+ */
+struct tcpcb *
+tcp_disconnect(tp)
+ register struct tcpcb *tp;
+{
+ struct socket *so = tp->t_inpcb->inp_socket;
+
+ if (tp->t_state < TCPS_ESTABLISHED)
+ tp = tcp_close(tp);
+ else if ((so->so_options & SO_LINGER) && so->so_linger == 0)
+ tp = tcp_drop(tp, 0);
+ else {
+ soisdisconnecting(so);
+ sbflush(&so->so_rcv);
+ tp = tcp_usrclosed(tp);
+ if (tp)
+ (void) tcp_output(tp);
+ }
+ return (tp);
+}
+
+/*
+ * User issued close, and wish to trail through shutdown states:
+ * if never received SYN, just forget it. If got a SYN from peer,
+ * but haven't sent FIN, then go to FIN_WAIT_1 state to send peer a FIN.
+ * If already got a FIN from peer, then almost done; go to LAST_ACK
+ * state. In all other cases, have already sent FIN to peer (e.g.
+ * after PRU_SHUTDOWN), and just have to play tedious game waiting
+ * for peer to send FIN or not respond to keep-alives, etc.
+ * We can let the user exit from the close as soon as the FIN is acked.
+ */
+struct tcpcb *
projects / unix-history / blobdiff