usr/src/sys/netiso/tuba_usrreq.c

/*
 * Copyright (c) 1992 Regents of the University of California.
 * All rights reserved.
 *
 * %sccs.include.redist.c%
 *
 *      @(#)tuba_usrreq.c       7.4 (Berkeley) %G%
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/protosw.h>
#include <sys/errno.h>
#include <sys/stat.h>

#include <net/if.h>
#include <net/route.h>

#include <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/ip_var.h>
#include <netinet/tcp.h>
#include <netinet/tcp_fsm.h>
#include <netinet/tcp_seq.h>
#include <netinet/tcp_timer.h>
#include <netinet/tcp_var.h>
#include <netinet/tcpip.h>
#include <netinet/tcp_debug.h>

#include <netiso/argo_debug.h>
#include <netiso/iso.h>
#include <netiso/clnp.h>
#include <netiso/iso_pcb.h>
#include <netiso/iso_var.h>
#include <netiso/tuba_table.h>
/*
 * TCP protocol interface to socket abstraction.
 */
extern  char *tcpstates[];
extern  struct inpcb tcb;
struct  isopcb tuba_isopcb;

/*
 * Process a TCP user request for TCP tb.  If this is a send request
 * then m is the mbuf chain of send data.  If this is a timer expiration
 * (called from the software clock routine), then timertype tells which timer.
 */
/*ARGSUSED*/
tuba_usrreq(so, req, m, nam, control)
        struct socket *so;
        int req;
        struct mbuf *m, *nam, *control;
{
        register struct inpcb *inp;
        register struct isopcb *isop;
        register struct tcpcb *tp;
        int s;
        int error = 0;
        int ostate;
        struct sockaddr_iso *siso;

        if (req == PRU_CONTROL)
                return (iso_control(so, (int)m, (caddr_t)nam,
                        (struct ifnet *)control));

        s = splnet();
        inp = sotoinpcb(so);
        /*
         * When a TCP is attached to a socket, then there will be
         * a (struct inpcb) pointed at by the socket, and this
         * structure will point at a subsidary (struct tcpcb).
         */
        if (inp == 0  && req != PRU_ATTACH) {
                splx(s);
                return (EINVAL);                /* XXX */
        }
        if (inp) {
                tp = intotcpcb(inp);
                if (tp == 0)
                        panic("tuba_usrreq");
                ostate = tp->t_state;
                isop = (struct isopcb *)tp->t_tuba_pcb;
                if (isop == 0)
                        panic("tuba_usrreq 2");
        } else
                ostate = 0;
        switch (req) {

        /*
         * TCP attaches to socket via PRU_ATTACH, reserving space,
         * and an internet control block.  We also need to
         * allocate an isopcb and separate the control block from
         * tcp/ip ones.
         */
        case PRU_ATTACH:
                if (error = iso_pcballoc(so, &tuba_isopcb))
                        break;
                isop = (struct isopcb *)so->so_pcb;
                so->so_pcb = 0;
                if (error = tcp_usrreq(so, req, m, nam, control)) {
                        isop->isop_socket = 0;
                        iso_pcbdetach(isop);
                } else {
                        inp = sotoinpcb(so);
                        tp = intotcpcb(inp);
                        if (tp == 0)
                                panic("tuba_usrreq 3");
                        tp->t_tuba_pcb = (caddr_t) isop;
                }
                goto notrace;

        /*
         * PRU_DETACH detaches the TCP protocol from the socket.
         * If the protocol state is non-embryonic, then can't
         * do this directly: have to initiate a PRU_DISCONNECT,
         * which may finish later; embryonic TCB's can just
         * be discarded here.
         */
        case PRU_DETACH:
                if (tp->t_state > TCPS_LISTEN)
                        tp = tcp_disconnect(tp);
                else
                        tp = tcp_close(tp);
                if (tp == 0)
                        tuba_pcbdetach(isop);
                break;

        /*
         * Give the socket an address.
         */
        case PRU_BIND:
                siso = mtod(nam, struct sockaddr_iso *);
                if (siso->siso_tlen && siso->siso_tlen != 2) {
                        error = EINVAL;
                        break;
                }
                if ((error = iso_pcbbind(isop, nam)) ||
                    (siso = isop->isop_laddr) == 0)
                        break;
                bcopy(TSEL(siso), &inp->inp_lport, 2);
                if (siso->siso_nlen &&
                    !(inp->inp_laddr.s_addr = tuba_lookup(&siso->siso_addr, M_WAITOK)))
                        error = ENOBUFS;
                break;

        /*
         * Prepare to accept connections.
         */
        case PRU_CONNECT:
        case PRU_LISTEN:
                if (inp->inp_lport == 0 &&
                    (error = iso_pcbbind(isop, (struct mbuf *)0)))
                        break;
                bcopy(TSEL(isop->isop_laddr), &inp->inp_lport, 2);
                if (req == PRU_LISTEN) {
                        tp->t_state = TCPS_LISTEN;
                        break;
                }
        /*FALLTHROUGH*/
        /*
         * Initiate connection to peer.
         * Create a template for use in transmissions on this connection.
         * Enter SYN_SENT state, and mark socket as connecting.
         * Start keep-alive timer, and seed output sequence space.
         * Send initial segment on connection.
         */
        /* case PRU_CONNECT: */
                if (error = iso_pcbconnect(isop, nam))
                        break;
                siso = mtod(nam, struct sockaddr_iso *);
                if (!(inp->inp_faddr.s_addr = tuba_lookup(&siso->siso_addr, M_WAITOK))) {
                unconnect:
                        iso_pcbdisconnect(isop);
                        error = ENOBUFS;
                        break;
                }
                bcopy(TSEL(isop->isop_faddr), &inp->inp_fport, 2);
                if (inp->inp_laddr.s_addr == 0 &&
                     (inp->inp_laddr.s_addr =
                            tuba_lookup(&isop->isop_laddr->siso_addr, M_WAITOK)) == 0)
                        goto unconnect;
                if ((tp->t_template = tcp_template(tp)) == 0)
                        goto unconnect;
                soisconnecting(so);
                tcpstat.tcps_connattempt++;
                tp->t_state = TCPS_SYN_SENT;
                tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
                tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2;
                tcp_sendseqinit(tp);
                error = tcp_output(tp);
                tuba_refcnt(isop, 1);
                break;

        /*
         * Initiate disconnect from peer.
         * If connection never passed embryonic stage, just drop;
         * else if don't need to let data drain, then can just drop anyways,
         * else have to begin TCP shutdown process: mark socket disconnecting,
         * drain unread data, state switch to reflect user close, and
         * send segment (e.g. FIN) to peer.  Socket will be really disconnected
         * when peer sends FIN and acks ours.
         *
         * SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
         */
        case PRU_DISCONNECT:
                if ((tp = tcp_disconnect(tp)) == 0)
                        tuba_pcbdetach(isop);
                break;

        /*
         * Accept a connection.  Essentially all the work is
         * done at higher levels; just return the address
         * of the peer, storing through addr.
         */
        case PRU_ACCEPT:
                bcopy((caddr_t)isop->isop_faddr, mtod(m, caddr_t),
                        nam->m_len = isop->isop_faddr->siso_len);
                break;

        /*
         * Mark the connection as being incapable of further output.
         */
        case PRU_SHUTDOWN:
                socantsendmore(so);
                tp = tcp_usrclosed(tp);
                if (tp)
                        error = tcp_output(tp);
                else
                        tuba_pcbdetach(isop);
                break;
        /*
         * Abort the TCP.
         */
        case PRU_ABORT:
                if ((tp = tcp_drop(tp, ECONNABORTED)) == 0)
                        tuba_pcbdetach(isop);
                break;


        case PRU_SOCKADDR:
                if (isop->isop_laddr)
                        bcopy((caddr_t)isop->isop_laddr, mtod(m, caddr_t),
                                nam->m_len = isop->isop_laddr->siso_len);
                break;

        case PRU_PEERADDR:
                if (isop->isop_faddr)
                        bcopy((caddr_t)isop->isop_faddr, mtod(m, caddr_t),
                                nam->m_len = isop->isop_faddr->siso_len);
                break;

        default:
                error = tcp_usrreq(so, req, m, nam, control);
                goto notrace;
        }
        if (tp && (so->so_options & SO_DEBUG))
                tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req);
notrace:
        splx(s);
        return(error);
}

tuba_ctloutput(op, so, level, optname, mp)
        int op;
        struct socket *so;
        int level, optname;
        struct mbuf **mp;
{
        int clnp_ctloutput(), tcp_ctloutput();

        return ((level != IPPROTO_TCP ? clnp_ctloutput : tcp_ctloutput)
                (clnp_ctloutput(op, so, level, optname, mp)));
}