314 lines
8.8 KiB
C
314 lines
8.8 KiB
C
/*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)tuba_usrreq.c 8.1 (Berkeley) 6/10/93
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* $Id: tuba_usrreq.c,v 1.2 1994/08/02 07:51:38 davidg Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <sys/stat.h>
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#include <net/if.h>
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#include <net/route.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/in_pcb.h>
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#include <netinet/ip_var.h>
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#include <netinet/tcp.h>
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#include <netinet/tcp_fsm.h>
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#include <netinet/tcp_seq.h>
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#include <netinet/tcp_timer.h>
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#include <netinet/tcp_var.h>
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#include <netinet/tcpip.h>
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#include <netinet/tcp_debug.h>
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#include <netiso/argo_debug.h>
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#include <netiso/iso.h>
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#include <netiso/clnp.h>
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#include <netiso/iso_pcb.h>
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#include <netiso/iso_var.h>
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#include <netiso/tuba_table.h>
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/*
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* TCP protocol interface to socket abstraction.
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*/
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extern char *tcpstates[];
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extern struct inpcb tuba_inpcb;
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extern struct isopcb tuba_isopcb;
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/*
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* Process a TCP user request for TCP tb. If this is a send request
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* then m is the mbuf chain of send data. If this is a timer expiration
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* (called from the software clock routine), then timertype tells which timer.
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*/
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/*ARGSUSED*/
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tuba_usrreq(so, req, m, nam, control)
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struct socket *so;
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int req;
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struct mbuf *m, *nam, *control;
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{
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register struct inpcb *inp;
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register struct isopcb *isop;
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register struct tcpcb *tp;
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int s;
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int error = 0;
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int ostate;
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struct sockaddr_iso *siso;
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if (req == PRU_CONTROL)
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return (iso_control(so, (int)m, (caddr_t)nam,
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(struct ifnet *)control));
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s = splnet();
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inp = sotoinpcb(so);
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/*
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* When a TCP is attached to a socket, then there will be
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* a (struct inpcb) pointed at by the socket, and this
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* structure will point at a subsidary (struct tcpcb).
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*/
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if (inp == 0 && req != PRU_ATTACH) {
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splx(s);
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return (EINVAL); /* XXX */
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}
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if (inp) {
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tp = intotcpcb(inp);
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if (tp == 0)
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panic("tuba_usrreq");
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ostate = tp->t_state;
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isop = (struct isopcb *)tp->t_tuba_pcb;
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if (isop == 0)
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panic("tuba_usrreq 2");
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} else
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ostate = 0;
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switch (req) {
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/*
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* TCP attaches to socket via PRU_ATTACH, reserving space,
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* and an internet control block. We also need to
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* allocate an isopcb and separate the control block from
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* tcp/ip ones.
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*/
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case PRU_ATTACH:
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if (error = iso_pcballoc(so, &tuba_isopcb))
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break;
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isop = (struct isopcb *)so->so_pcb;
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so->so_pcb = 0;
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if (error = tcp_usrreq(so, req, m, nam, control)) {
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isop->isop_socket = 0;
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iso_pcbdetach(isop);
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} else {
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inp = sotoinpcb(so);
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remque(inp);
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insque(inp, &tuba_inpcb);
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inp->inp_head = &tuba_inpcb;
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tp = intotcpcb(inp);
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if (tp == 0)
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panic("tuba_usrreq 3");
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tp->t_tuba_pcb = (caddr_t) isop;
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}
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goto notrace;
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/*
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* PRU_DETACH detaches the TCP protocol from the socket.
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* If the protocol state is non-embryonic, then can't
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* do this directly: have to initiate a PRU_DISCONNECT,
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* which may finish later; embryonic TCB's can just
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* be discarded here.
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*/
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case PRU_DETACH:
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if (tp->t_state > TCPS_LISTEN)
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tp = tcp_disconnect(tp);
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else
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tp = tcp_close(tp);
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if (tp == 0)
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tuba_pcbdetach(isop);
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break;
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/*
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* Give the socket an address.
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*/
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case PRU_BIND:
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siso = mtod(nam, struct sockaddr_iso *);
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if (siso->siso_tlen && siso->siso_tlen != 2) {
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error = EINVAL;
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break;
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}
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if ((error = iso_pcbbind(isop, nam)) ||
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(siso = isop->isop_laddr) == 0)
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break;
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bcopy(TSEL(siso), &inp->inp_lport, 2);
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if (siso->siso_nlen &&
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!(inp->inp_laddr.s_addr = tuba_lookup(siso, M_WAITOK)))
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error = ENOBUFS;
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break;
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/*
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* Prepare to accept connections.
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*/
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case PRU_CONNECT:
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case PRU_LISTEN:
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if (inp->inp_lport == 0 &&
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(error = iso_pcbbind(isop, (struct mbuf *)0)))
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break;
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bcopy(TSEL(isop->isop_laddr), &inp->inp_lport, 2);
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if (req == PRU_LISTEN) {
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tp->t_state = TCPS_LISTEN;
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break;
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}
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/*FALLTHROUGH*/
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/*
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* Initiate connection to peer.
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* Create a template for use in transmissions on this connection.
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* Enter SYN_SENT state, and mark socket as connecting.
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* Start keep-alive timer, and seed output sequence space.
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* Send initial segment on connection.
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*/
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/* case PRU_CONNECT: */
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if (error = iso_pcbconnect(isop, nam))
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break;
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if ((siso = isop->isop_laddr) && siso->siso_nlen > 1)
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siso->siso_data[siso->siso_nlen - 1] = ISOPROTO_TCP;
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else
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panic("tuba_usrreq: connect");
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siso = mtod(nam, struct sockaddr_iso *);
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if (!(inp->inp_faddr.s_addr = tuba_lookup(siso, M_WAITOK))) {
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unconnect:
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iso_pcbdisconnect(isop);
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error = ENOBUFS;
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break;
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}
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bcopy(TSEL(isop->isop_faddr), &inp->inp_fport, 2);
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if (inp->inp_laddr.s_addr == 0 &&
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(inp->inp_laddr.s_addr =
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tuba_lookup(isop->isop_laddr, M_WAITOK)) == 0)
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goto unconnect;
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if ((tp->t_template = tcp_template(tp)) == 0)
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goto unconnect;
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soisconnecting(so);
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tcpstat.tcps_connattempt++;
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tp->t_state = TCPS_SYN_SENT;
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tp->t_timer[TCPT_KEEP] = TCPTV_KEEP_INIT;
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tp->iss = tcp_iss; tcp_iss += TCP_ISSINCR/2;
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tcp_sendseqinit(tp);
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error = tcp_output(tp);
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tuba_refcnt(isop, 1);
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break;
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/*
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* Initiate disconnect from peer.
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* If connection never passed embryonic stage, just drop;
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* else if don't need to let data drain, then can just drop anyways,
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* else have to begin TCP shutdown process: mark socket disconnecting,
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* drain unread data, state switch to reflect user close, and
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* send segment (e.g. FIN) to peer. Socket will be really disconnected
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* when peer sends FIN and acks ours.
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*
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* SHOULD IMPLEMENT LATER PRU_CONNECT VIA REALLOC TCPCB.
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*/
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case PRU_DISCONNECT:
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if ((tp = tcp_disconnect(tp)) == 0)
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tuba_pcbdetach(isop);
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break;
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/*
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* Accept a connection. Essentially all the work is
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* done at higher levels; just return the address
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* of the peer, storing through addr.
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*/
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case PRU_ACCEPT:
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bcopy((caddr_t)isop->isop_faddr, mtod(nam, caddr_t),
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nam->m_len = isop->isop_faddr->siso_len);
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break;
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/*
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* Mark the connection as being incapable of further output.
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*/
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case PRU_SHUTDOWN:
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socantsendmore(so);
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tp = tcp_usrclosed(tp);
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if (tp)
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error = tcp_output(tp);
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else
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tuba_pcbdetach(isop);
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break;
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/*
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* Abort the TCP.
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*/
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case PRU_ABORT:
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if ((tp = tcp_drop(tp, ECONNABORTED)) == 0)
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tuba_pcbdetach(isop);
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break;
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case PRU_SOCKADDR:
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if (isop->isop_laddr)
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bcopy((caddr_t)isop->isop_laddr, mtod(nam, caddr_t),
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nam->m_len = isop->isop_laddr->siso_len);
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break;
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case PRU_PEERADDR:
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if (isop->isop_faddr)
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bcopy((caddr_t)isop->isop_faddr, mtod(nam, caddr_t),
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nam->m_len = isop->isop_faddr->siso_len);
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break;
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default:
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error = tcp_usrreq(so, req, m, nam, control);
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goto notrace;
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}
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if (tp && (so->so_options & SO_DEBUG))
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tcp_trace(TA_USER, ostate, tp, (struct tcpiphdr *)0, req);
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notrace:
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splx(s);
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return(error);
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}
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tuba_ctloutput(op, so, level, optname, mp)
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int op;
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struct socket *so;
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int level, optname;
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struct mbuf **mp;
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{
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int clnp_ctloutput(), tcp_ctloutput();
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return ((level != IPPROTO_TCP ? clnp_ctloutput : tcp_ctloutput)
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(op, so, level, optname, mp));
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}
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