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28b2aee58f
the former use a three-clause BSD license (per UCB authorization letter), whereas he uses a four-clause BSD license. MFC after: 3 days
2104 lines
50 KiB
C
2104 lines
50 KiB
C
/*-
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* Copyright (c) 1984, 1985, 1986, 1987, 1993
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* The Regents of the University of California.
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* Copyright (c) 2004-2006 Robert N. M. Watson
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* 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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* 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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* Copyright (c) 1995, Mike Mitchell
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* 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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* @(#)spx_usrreq.h
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/protosw.h>
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#include <sys/signalvar.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/sx.h>
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#include <sys/systm.h>
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#include <net/route.h>
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#include <netinet/tcp_fsm.h>
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#include <netipx/ipx.h>
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#include <netipx/ipx_pcb.h>
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#include <netipx/ipx_var.h>
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#include <netipx/spx.h>
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#include <netipx/spx_debug.h>
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#include <netipx/spx_timer.h>
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#include <netipx/spx_var.h>
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/*
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* SPX protocol implementation.
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*/
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static struct mtx spx_mtx; /* Protects only spx_iss. */
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static u_short spx_iss;
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static u_short spx_newchecks[50];
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static int spx_hardnosed;
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static int spx_use_delack = 0;
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static int traceallspxs = 0;
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static struct spx_istat spx_istat;
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static int spxrexmtthresh = 3;
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#define SPX_LOCK_INIT() mtx_init(&spx_mtx, "spx_mtx", NULL, MTX_DEF)
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#define SPX_LOCK() mtx_lock(&spx_mtx)
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#define SPX_UNLOCK() mtx_unlock(&spx_mtx)
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/* Following was struct spxstat spxstat; */
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#ifndef spxstat
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#define spxstat spx_istat.newstats
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#endif
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static const int spx_backoff[SPX_MAXRXTSHIFT+1] =
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{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
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static void spx_close(struct spxpcb *cb);
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static void spx_disconnect(struct spxpcb *cb);
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static void spx_drop(struct spxpcb *cb, int errno);
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static int spx_output(struct spxpcb *cb, struct mbuf *m0);
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static int spx_reass(struct spxpcb *cb, struct spx *si);
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static void spx_setpersist(struct spxpcb *cb);
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static void spx_template(struct spxpcb *cb);
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static void spx_timers(struct spxpcb *cb, int timer);
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static void spx_usrclosed(struct spxpcb *cb);
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static void spx_usr_abort(struct socket *so);
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static int spx_accept(struct socket *so, struct sockaddr **nam);
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static int spx_attach(struct socket *so, int proto, struct thread *td);
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static int spx_bind(struct socket *so, struct sockaddr *nam, struct thread *td);
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static void spx_usr_close(struct socket *so);
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static int spx_connect(struct socket *so, struct sockaddr *nam,
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struct thread *td);
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static void spx_detach(struct socket *so);
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static void spx_pcbdetach(struct ipxpcb *ipxp);
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static int spx_usr_disconnect(struct socket *so);
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static int spx_listen(struct socket *so, int backlog, struct thread *td);
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static int spx_rcvd(struct socket *so, int flags);
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static int spx_rcvoob(struct socket *so, struct mbuf *m, int flags);
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static int spx_send(struct socket *so, int flags, struct mbuf *m,
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struct sockaddr *addr, struct mbuf *control,
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struct thread *td);
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static int spx_shutdown(struct socket *so);
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static int spx_sp_attach(struct socket *so, int proto, struct thread *td);
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struct pr_usrreqs spx_usrreqs = {
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.pru_abort = spx_usr_abort,
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.pru_accept = spx_accept,
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.pru_attach = spx_attach,
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.pru_bind = spx_bind,
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.pru_connect = spx_connect,
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.pru_control = ipx_control,
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.pru_detach = spx_detach,
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.pru_disconnect = spx_usr_disconnect,
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.pru_listen = spx_listen,
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.pru_peeraddr = ipx_peeraddr,
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.pru_rcvd = spx_rcvd,
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.pru_rcvoob = spx_rcvoob,
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.pru_send = spx_send,
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.pru_shutdown = spx_shutdown,
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.pru_sockaddr = ipx_sockaddr,
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.pru_close = spx_usr_close,
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};
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struct pr_usrreqs spx_usrreq_sps = {
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.pru_abort = spx_usr_abort,
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.pru_accept = spx_accept,
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.pru_attach = spx_sp_attach,
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.pru_bind = spx_bind,
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.pru_connect = spx_connect,
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.pru_control = ipx_control,
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.pru_detach = spx_detach,
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.pru_disconnect = spx_usr_disconnect,
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.pru_listen = spx_listen,
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.pru_peeraddr = ipx_peeraddr,
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.pru_rcvd = spx_rcvd,
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.pru_rcvoob = spx_rcvoob,
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.pru_send = spx_send,
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.pru_shutdown = spx_shutdown,
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.pru_sockaddr = ipx_sockaddr,
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.pru_close = spx_usr_close,
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};
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void
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spx_init(void)
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{
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SPX_LOCK_INIT();
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spx_iss = 1; /* WRONG !! should fish it out of TODR */
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}
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void
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spx_input(struct mbuf *m, struct ipxpcb *ipxp)
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{
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struct spxpcb *cb;
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struct spx *si = mtod(m, struct spx *);
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struct socket *so;
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struct spx spx_savesi;
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int dropsocket = 0;
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short ostate = 0;
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spxstat.spxs_rcvtotal++;
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KASSERT(ipxp != NULL, ("spx_input: ipxpcb == NULL"));
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/*
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* spx_input() assumes that the caller will hold both the pcb list
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* lock and also the ipxp lock. spx_input() will release both before
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* returning, and may in fact trade in the ipxp lock for another pcb
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* lock following sonewconn().
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*/
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IPX_LIST_LOCK_ASSERT();
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IPX_LOCK_ASSERT(ipxp);
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cb = ipxtospxpcb(ipxp);
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KASSERT(cb != NULL, ("spx_input: cb == NULL"));
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if (ipxp->ipxp_flags & IPXP_DROPPED)
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goto drop;
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if (m->m_len < sizeof(*si)) {
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if ((m = m_pullup(m, sizeof(*si))) == NULL) {
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IPX_UNLOCK(ipxp);
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IPX_LIST_UNLOCK();
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spxstat.spxs_rcvshort++;
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return;
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}
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si = mtod(m, struct spx *);
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}
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si->si_seq = ntohs(si->si_seq);
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si->si_ack = ntohs(si->si_ack);
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si->si_alo = ntohs(si->si_alo);
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so = ipxp->ipxp_socket;
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KASSERT(so != NULL, ("spx_input: so == NULL"));
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if (so->so_options & SO_DEBUG || traceallspxs) {
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ostate = cb->s_state;
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spx_savesi = *si;
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}
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if (so->so_options & SO_ACCEPTCONN) {
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struct spxpcb *ocb = cb;
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so = sonewconn(so, 0);
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if (so == NULL)
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goto drop;
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/*
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* This is ugly, but ....
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*
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* Mark socket as temporary until we're committed to keeping
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* it. The code at ``drop'' and ``dropwithreset'' check the
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* flag dropsocket to see if the temporary socket created
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* here should be discarded. We mark the socket as
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* discardable until we're committed to it below in
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* TCPS_LISTEN.
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*
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* XXXRW: In the new world order of real kernel parallelism,
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* temporarily allocating the socket when we're "not sure"
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* seems like a bad idea, as we might race to remove it if
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* the listen socket is closed...?
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*
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* We drop the lock of the listen socket ipxp, and acquire
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* the lock of the new socket ippx.
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*/
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dropsocket++;
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IPX_UNLOCK(ipxp);
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ipxp = (struct ipxpcb *)so->so_pcb;
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IPX_LOCK(ipxp);
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ipxp->ipxp_laddr = si->si_dna;
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cb = ipxtospxpcb(ipxp);
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cb->s_mtu = ocb->s_mtu; /* preserve sockopts */
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cb->s_flags = ocb->s_flags; /* preserve sockopts */
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cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */
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cb->s_state = TCPS_LISTEN;
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}
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IPX_LOCK_ASSERT(ipxp);
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/*
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* Packet received on connection. Reset idle time and keep-alive
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* timer.
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*/
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cb->s_idle = 0;
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cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
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switch (cb->s_state) {
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case TCPS_LISTEN:{
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struct sockaddr_ipx *sipx, ssipx;
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struct ipx_addr laddr;
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/*
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* If somebody here was carying on a conversation and went
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* away, and his pen pal thinks he can still talk, we get the
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* misdirected packet.
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*/
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if (spx_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
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spx_istat.gonawy++;
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goto dropwithreset;
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}
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sipx = &ssipx;
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bzero(sipx, sizeof *sipx);
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sipx->sipx_len = sizeof(*sipx);
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sipx->sipx_family = AF_IPX;
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sipx->sipx_addr = si->si_sna;
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laddr = ipxp->ipxp_laddr;
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if (ipx_nullhost(laddr))
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ipxp->ipxp_laddr = si->si_dna;
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if (ipx_pcbconnect(ipxp, (struct sockaddr *)sipx, &thread0)) {
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ipxp->ipxp_laddr = laddr;
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spx_istat.noconn++;
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goto drop;
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}
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spx_template(cb);
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dropsocket = 0; /* committed to socket */
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cb->s_did = si->si_sid;
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cb->s_rack = si->si_ack;
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cb->s_ralo = si->si_alo;
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#define THREEWAYSHAKE
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#ifdef THREEWAYSHAKE
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cb->s_state = TCPS_SYN_RECEIVED;
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cb->s_force = 1 + SPXT_KEEP;
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spxstat.spxs_accepts++;
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cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
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}
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break;
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case TCPS_SYN_RECEIVED: {
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/*
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* This state means that we have heard a response to our
|
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* acceptance of their connection. It is probably logically
|
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* unnecessary in this implementation.
|
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*/
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if (si->si_did != cb->s_sid) {
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spx_istat.wrncon++;
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goto drop;
|
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}
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#endif
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ipxp->ipxp_fport = si->si_sport;
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cb->s_timer[SPXT_REXMT] = 0;
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cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
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soisconnected(so);
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cb->s_state = TCPS_ESTABLISHED;
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spxstat.spxs_accepts++;
|
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}
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break;
|
|
|
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case TCPS_SYN_SENT:
|
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/*
|
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* This state means that we have gotten a response to our
|
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* attempt to establish a connection. We fill in the data
|
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* from the other side, telling us which port to respond to,
|
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* instead of the well-known one we might have sent to in the
|
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* first place. We also require that this is a response to
|
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* our connection id.
|
|
*/
|
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if (si->si_did != cb->s_sid) {
|
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spx_istat.notme++;
|
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goto drop;
|
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}
|
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spxstat.spxs_connects++;
|
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cb->s_did = si->si_sid;
|
|
cb->s_rack = si->si_ack;
|
|
cb->s_ralo = si->si_alo;
|
|
cb->s_dport = ipxp->ipxp_fport = si->si_sport;
|
|
cb->s_timer[SPXT_REXMT] = 0;
|
|
cb->s_flags |= SF_ACKNOW;
|
|
soisconnected(so);
|
|
cb->s_state = TCPS_ESTABLISHED;
|
|
/*
|
|
* Use roundtrip time of connection request for initial rtt.
|
|
*/
|
|
if (cb->s_rtt) {
|
|
cb->s_srtt = cb->s_rtt << 3;
|
|
cb->s_rttvar = cb->s_rtt << 1;
|
|
SPXT_RANGESET(cb->s_rxtcur,
|
|
((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
|
|
SPXTV_MIN, SPXTV_REXMTMAX);
|
|
cb->s_rtt = 0;
|
|
}
|
|
}
|
|
|
|
if (so->so_options & SO_DEBUG || traceallspxs)
|
|
spx_trace(SA_INPUT, (u_char)ostate, cb, &spx_savesi, 0);
|
|
|
|
m->m_len -= sizeof(struct ipx);
|
|
m->m_pkthdr.len -= sizeof(struct ipx);
|
|
m->m_data += sizeof(struct ipx);
|
|
|
|
if (spx_reass(cb, si))
|
|
m_freem(m);
|
|
if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT)))
|
|
spx_output(cb, NULL);
|
|
cb->s_flags &= ~(SF_WIN|SF_RXT);
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
return;
|
|
|
|
dropwithreset:
|
|
IPX_LOCK_ASSERT(ipxp);
|
|
if (cb == NULL || (cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG ||
|
|
traceallspxs))
|
|
spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
|
|
IPX_UNLOCK(ipxp);
|
|
if (dropsocket) {
|
|
struct socket *head;
|
|
ACCEPT_LOCK();
|
|
KASSERT((so->so_qstate & SQ_INCOMP) != 0,
|
|
("spx_input: nascent socket not SQ_INCOMP on soabort()"));
|
|
head = so->so_head;
|
|
TAILQ_REMOVE(&head->so_incomp, so, so_list);
|
|
head->so_incqlen--;
|
|
so->so_qstate &= ~SQ_INCOMP;
|
|
so->so_head = NULL;
|
|
ACCEPT_UNLOCK();
|
|
soabort(so);
|
|
}
|
|
IPX_LIST_UNLOCK();
|
|
m_freem(dtom(si));
|
|
return;
|
|
|
|
drop:
|
|
IPX_LOCK_ASSERT(ipxp);
|
|
if (cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || traceallspxs)
|
|
spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
m_freem(m);
|
|
}
|
|
|
|
/*
|
|
* This is structurally similar to the tcp reassembly routine but its
|
|
* function is somewhat different: It merely queues packets up, and
|
|
* suppresses duplicates.
|
|
*/
|
|
static int
|
|
spx_reass(struct spxpcb *cb, struct spx *si)
|
|
{
|
|
struct spx_q *q;
|
|
struct mbuf *m;
|
|
struct socket *so = cb->s_ipxpcb->ipxp_socket;
|
|
char packetp = cb->s_flags & SF_HI;
|
|
int incr;
|
|
char wakeup = 0;
|
|
|
|
IPX_LOCK_ASSERT(cb->s_ipxpcb);
|
|
|
|
if (si == SI(0))
|
|
goto present;
|
|
/*
|
|
* Update our news from them.
|
|
*/
|
|
if (si->si_cc & SPX_SA)
|
|
cb->s_flags |= (spx_use_delack ? SF_DELACK : SF_ACKNOW);
|
|
if (SSEQ_GT(si->si_alo, cb->s_ralo))
|
|
cb->s_flags |= SF_WIN;
|
|
if (SSEQ_LEQ(si->si_ack, cb->s_rack)) {
|
|
if ((si->si_cc & SPX_SP) && cb->s_rack != (cb->s_smax + 1)) {
|
|
spxstat.spxs_rcvdupack++;
|
|
/*
|
|
* If this is a completely duplicate ack and other
|
|
* conditions hold, we assume a packet has been
|
|
* dropped and retransmit it exactly as in
|
|
* tcp_input().
|
|
*/
|
|
if (si->si_ack != cb->s_rack ||
|
|
si->si_alo != cb->s_ralo)
|
|
cb->s_dupacks = 0;
|
|
else if (++cb->s_dupacks == spxrexmtthresh) {
|
|
u_short onxt = cb->s_snxt;
|
|
int cwnd = cb->s_cwnd;
|
|
|
|
cb->s_snxt = si->si_ack;
|
|
cb->s_cwnd = CUNIT;
|
|
cb->s_force = 1 + SPXT_REXMT;
|
|
spx_output(cb, NULL);
|
|
cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
|
|
cb->s_rtt = 0;
|
|
if (cwnd >= 4 * CUNIT)
|
|
cb->s_cwnd = cwnd / 2;
|
|
if (SSEQ_GT(onxt, cb->s_snxt))
|
|
cb->s_snxt = onxt;
|
|
return (1);
|
|
}
|
|
} else
|
|
cb->s_dupacks = 0;
|
|
goto update_window;
|
|
}
|
|
cb->s_dupacks = 0;
|
|
|
|
/*
|
|
* If our correspondent acknowledges data we haven't sent TCP would
|
|
* drop the packet after acking. We'll be a little more permissive.
|
|
*/
|
|
if (SSEQ_GT(si->si_ack, (cb->s_smax + 1))) {
|
|
spxstat.spxs_rcvacktoomuch++;
|
|
si->si_ack = cb->s_smax + 1;
|
|
}
|
|
spxstat.spxs_rcvackpack++;
|
|
|
|
/*
|
|
* If transmit timer is running and timed sequence number was acked,
|
|
* update smoothed round trip time. See discussion of algorithm in
|
|
* tcp_input.c
|
|
*/
|
|
if (cb->s_rtt && SSEQ_GT(si->si_ack, cb->s_rtseq)) {
|
|
spxstat.spxs_rttupdated++;
|
|
if (cb->s_srtt != 0) {
|
|
short delta;
|
|
delta = cb->s_rtt - (cb->s_srtt >> 3);
|
|
if ((cb->s_srtt += delta) <= 0)
|
|
cb->s_srtt = 1;
|
|
if (delta < 0)
|
|
delta = -delta;
|
|
delta -= (cb->s_rttvar >> 2);
|
|
if ((cb->s_rttvar += delta) <= 0)
|
|
cb->s_rttvar = 1;
|
|
} else {
|
|
/*
|
|
* No rtt measurement yet.
|
|
*/
|
|
cb->s_srtt = cb->s_rtt << 3;
|
|
cb->s_rttvar = cb->s_rtt << 1;
|
|
}
|
|
cb->s_rtt = 0;
|
|
cb->s_rxtshift = 0;
|
|
SPXT_RANGESET(cb->s_rxtcur,
|
|
((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
|
|
SPXTV_MIN, SPXTV_REXMTMAX);
|
|
}
|
|
|
|
/*
|
|
* If all outstanding data is acked, stop retransmit timer and
|
|
* remember to restart (more output or persist). If there is more
|
|
* data to be acked, restart retransmit timer, using current
|
|
* (possibly backed-off) value;
|
|
*/
|
|
if (si->si_ack == cb->s_smax + 1) {
|
|
cb->s_timer[SPXT_REXMT] = 0;
|
|
cb->s_flags |= SF_RXT;
|
|
} else if (cb->s_timer[SPXT_PERSIST] == 0)
|
|
cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
|
|
|
|
/*
|
|
* When new data is acked, open the congestion window. If the window
|
|
* gives us less than ssthresh packets in flight, open exponentially
|
|
* (maxseg at a time). Otherwise open linearly (maxseg^2 / cwnd at a
|
|
* time).
|
|
*/
|
|
incr = CUNIT;
|
|
if (cb->s_cwnd > cb->s_ssthresh)
|
|
incr = max(incr * incr / cb->s_cwnd, 1);
|
|
cb->s_cwnd = min(cb->s_cwnd + incr, cb->s_cwmx);
|
|
|
|
/*
|
|
* Trim Acked data from output queue.
|
|
*/
|
|
SOCKBUF_LOCK(&so->so_snd);
|
|
while ((m = so->so_snd.sb_mb) != NULL) {
|
|
if (SSEQ_LT((mtod(m, struct spx *))->si_seq, si->si_ack))
|
|
sbdroprecord_locked(&so->so_snd);
|
|
else
|
|
break;
|
|
}
|
|
sowwakeup_locked(so);
|
|
cb->s_rack = si->si_ack;
|
|
update_window:
|
|
if (SSEQ_LT(cb->s_snxt, cb->s_rack))
|
|
cb->s_snxt = cb->s_rack;
|
|
if (SSEQ_LT(cb->s_swl1, si->si_seq) || ((cb->s_swl1 == si->si_seq &&
|
|
(SSEQ_LT(cb->s_swl2, si->si_ack))) ||
|
|
(cb->s_swl2 == si->si_ack && SSEQ_LT(cb->s_ralo, si->si_alo)))) {
|
|
/* keep track of pure window updates */
|
|
if ((si->si_cc & SPX_SP) && cb->s_swl2 == si->si_ack
|
|
&& SSEQ_LT(cb->s_ralo, si->si_alo)) {
|
|
spxstat.spxs_rcvwinupd++;
|
|
spxstat.spxs_rcvdupack--;
|
|
}
|
|
cb->s_ralo = si->si_alo;
|
|
cb->s_swl1 = si->si_seq;
|
|
cb->s_swl2 = si->si_ack;
|
|
cb->s_swnd = (1 + si->si_alo - si->si_ack);
|
|
if (cb->s_swnd > cb->s_smxw)
|
|
cb->s_smxw = cb->s_swnd;
|
|
cb->s_flags |= SF_WIN;
|
|
}
|
|
|
|
/*
|
|
* If this packet number is higher than that which we have allocated
|
|
* refuse it, unless urgent.
|
|
*/
|
|
if (SSEQ_GT(si->si_seq, cb->s_alo)) {
|
|
if (si->si_cc & SPX_SP) {
|
|
spxstat.spxs_rcvwinprobe++;
|
|
return (1);
|
|
} else
|
|
spxstat.spxs_rcvpackafterwin++;
|
|
if (si->si_cc & SPX_OB) {
|
|
if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) {
|
|
m_freem(dtom(si));
|
|
return (0);
|
|
} /* else queue this packet; */
|
|
} else {
|
|
#ifdef BROKEN
|
|
/*
|
|
* XXXRW: This is broken on at least one count:
|
|
* spx_close() will free the ipxp and related parts,
|
|
* which are then touched by spx_input() after the
|
|
* return from spx_reass().
|
|
*/
|
|
/*struct socket *so = cb->s_ipxpcb->ipxp_socket;
|
|
if (so->so_state && SS_NOFDREF) {
|
|
spx_close(cb);
|
|
} else
|
|
would crash system*/
|
|
#endif
|
|
spx_istat.notyet++;
|
|
m_freem(dtom(si));
|
|
return (0);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If this is a system packet, we don't need to queue it up, and
|
|
* won't update acknowledge #.
|
|
*/
|
|
if (si->si_cc & SPX_SP)
|
|
return (1);
|
|
|
|
/*
|
|
* We have already seen this packet, so drop.
|
|
*/
|
|
if (SSEQ_LT(si->si_seq, cb->s_ack)) {
|
|
spx_istat.bdreas++;
|
|
spxstat.spxs_rcvduppack++;
|
|
if (si->si_seq == cb->s_ack - 1)
|
|
spx_istat.lstdup++;
|
|
return (1);
|
|
}
|
|
|
|
/*
|
|
* Loop through all packets queued up to insert in appropriate
|
|
* sequence.
|
|
*/
|
|
for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) {
|
|
if (si->si_seq == SI(q)->si_seq) {
|
|
spxstat.spxs_rcvduppack++;
|
|
return (1);
|
|
}
|
|
if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) {
|
|
spxstat.spxs_rcvoopack++;
|
|
break;
|
|
}
|
|
}
|
|
insque(si, q->si_prev);
|
|
/*
|
|
* If this packet is urgent, inform process
|
|
*/
|
|
if (si->si_cc & SPX_OB) {
|
|
cb->s_iobc = ((char *)si)[1 + sizeof(*si)];
|
|
sohasoutofband(so);
|
|
cb->s_oobflags |= SF_IOOB;
|
|
}
|
|
present:
|
|
#define SPINC sizeof(struct spxhdr)
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
|
|
/*
|
|
* Loop through all packets queued up to update acknowledge number,
|
|
* and present all acknowledged data to user; if in packet interface
|
|
* mode, show packet headers.
|
|
*/
|
|
for (q = cb->s_q.si_next; q != &cb->s_q; q = q->si_next) {
|
|
if (SI(q)->si_seq == cb->s_ack) {
|
|
cb->s_ack++;
|
|
m = dtom(q);
|
|
if (SI(q)->si_cc & SPX_OB) {
|
|
cb->s_oobflags &= ~SF_IOOB;
|
|
if (so->so_rcv.sb_cc)
|
|
so->so_oobmark = so->so_rcv.sb_cc;
|
|
else
|
|
so->so_rcv.sb_state |= SBS_RCVATMARK;
|
|
}
|
|
q = q->si_prev;
|
|
remque(q->si_next);
|
|
wakeup = 1;
|
|
spxstat.spxs_rcvpack++;
|
|
#ifdef SF_NEWCALL
|
|
if (cb->s_flags2 & SF_NEWCALL) {
|
|
struct spxhdr *sp = mtod(m, struct spxhdr *);
|
|
u_char dt = sp->spx_dt;
|
|
spx_newchecks[4]++;
|
|
if (dt != cb->s_rhdr.spx_dt) {
|
|
struct mbuf *mm =
|
|
m_getclr(M_DONTWAIT, MT_CONTROL);
|
|
spx_newchecks[0]++;
|
|
if (mm != NULL) {
|
|
u_short *s =
|
|
mtod(mm, u_short *);
|
|
cb->s_rhdr.spx_dt = dt;
|
|
mm->m_len = 5; /*XXX*/
|
|
s[0] = 5;
|
|
s[1] = 1;
|
|
*(u_char *)(&s[2]) = dt;
|
|
sbappend_locked(&so->so_rcv, mm);
|
|
}
|
|
}
|
|
if (sp->spx_cc & SPX_OB) {
|
|
MCHTYPE(m, MT_OOBDATA);
|
|
spx_newchecks[1]++;
|
|
so->so_oobmark = 0;
|
|
so->so_rcv.sb_state &= ~SBS_RCVATMARK;
|
|
}
|
|
if (packetp == 0) {
|
|
m->m_data += SPINC;
|
|
m->m_len -= SPINC;
|
|
m->m_pkthdr.len -= SPINC;
|
|
}
|
|
if ((sp->spx_cc & SPX_EM) || packetp) {
|
|
sbappendrecord_locked(&so->so_rcv, m);
|
|
spx_newchecks[9]++;
|
|
} else
|
|
sbappend_locked(&so->so_rcv, m);
|
|
} else
|
|
#endif
|
|
if (packetp)
|
|
sbappendrecord_locked(&so->so_rcv, m);
|
|
else {
|
|
cb->s_rhdr = *mtod(m, struct spxhdr *);
|
|
m->m_data += SPINC;
|
|
m->m_len -= SPINC;
|
|
m->m_pkthdr.len -= SPINC;
|
|
sbappend_locked(&so->so_rcv, m);
|
|
}
|
|
} else
|
|
break;
|
|
}
|
|
if (wakeup)
|
|
sorwakeup_locked(so);
|
|
else
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
spx_ctlinput(int cmd, struct sockaddr *arg_as_sa, void *dummy)
|
|
{
|
|
|
|
/* Currently, nothing. */
|
|
}
|
|
|
|
static int
|
|
spx_output(struct spxpcb *cb, struct mbuf *m0)
|
|
{
|
|
struct socket *so = cb->s_ipxpcb->ipxp_socket;
|
|
struct mbuf *m;
|
|
struct spx *si = NULL;
|
|
struct sockbuf *sb = &so->so_snd;
|
|
int len = 0, win, rcv_win;
|
|
short span, off, recordp = 0;
|
|
u_short alo;
|
|
int error = 0, sendalot;
|
|
#ifdef notdef
|
|
int idle;
|
|
#endif
|
|
struct mbuf *mprev;
|
|
|
|
IPX_LOCK_ASSERT(cb->s_ipxpcb);
|
|
|
|
if (m0 != NULL) {
|
|
int mtu = cb->s_mtu;
|
|
int datalen;
|
|
|
|
/*
|
|
* Make sure that packet isn't too big.
|
|
*/
|
|
for (m = m0; m != NULL; m = m->m_next) {
|
|
mprev = m;
|
|
len += m->m_len;
|
|
if (m->m_flags & M_EOR)
|
|
recordp = 1;
|
|
}
|
|
datalen = (cb->s_flags & SF_HO) ?
|
|
len - sizeof(struct spxhdr) : len;
|
|
if (datalen > mtu) {
|
|
if (cb->s_flags & SF_PI) {
|
|
m_freem(m0);
|
|
return (EMSGSIZE);
|
|
} else {
|
|
int oldEM = cb->s_cc & SPX_EM;
|
|
|
|
cb->s_cc &= ~SPX_EM;
|
|
while (len > mtu) {
|
|
m = m_copym(m0, 0, mtu, M_DONTWAIT);
|
|
if (m == NULL) {
|
|
cb->s_cc |= oldEM;
|
|
m_freem(m0);
|
|
return (ENOBUFS);
|
|
}
|
|
if (cb->s_flags & SF_NEWCALL) {
|
|
struct mbuf *mm = m;
|
|
spx_newchecks[7]++;
|
|
while (mm != NULL) {
|
|
mm->m_flags &= ~M_EOR;
|
|
mm = mm->m_next;
|
|
}
|
|
}
|
|
error = spx_output(cb, m);
|
|
if (error) {
|
|
cb->s_cc |= oldEM;
|
|
m_freem(m0);
|
|
return (error);
|
|
}
|
|
m_adj(m0, mtu);
|
|
len -= mtu;
|
|
}
|
|
cb->s_cc |= oldEM;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Force length even, by adding a "garbage byte" if
|
|
* necessary.
|
|
*/
|
|
if (len & 1) {
|
|
m = mprev;
|
|
if (M_TRAILINGSPACE(m) >= 1)
|
|
m->m_len++;
|
|
else {
|
|
struct mbuf *m1 = m_get(M_DONTWAIT, MT_DATA);
|
|
|
|
if (m1 == NULL) {
|
|
m_freem(m0);
|
|
return (ENOBUFS);
|
|
}
|
|
m1->m_len = 1;
|
|
*(mtod(m1, u_char *)) = 0;
|
|
m->m_next = m1;
|
|
}
|
|
}
|
|
m = m_gethdr(M_DONTWAIT, MT_DATA);
|
|
if (m == NULL) {
|
|
m_freem(m0);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
/*
|
|
* Fill in mbuf with extended SP header and addresses and
|
|
* length put into network format.
|
|
*/
|
|
MH_ALIGN(m, sizeof(struct spx));
|
|
m->m_len = sizeof(struct spx);
|
|
m->m_next = m0;
|
|
si = mtod(m, struct spx *);
|
|
si->si_i = *cb->s_ipx;
|
|
si->si_s = cb->s_shdr;
|
|
if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) {
|
|
struct spxhdr *sh;
|
|
if (m0->m_len < sizeof(*sh)) {
|
|
if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) {
|
|
m_free(m);
|
|
m_freem(m0);
|
|
return (EINVAL);
|
|
}
|
|
m->m_next = m0;
|
|
}
|
|
sh = mtod(m0, struct spxhdr *);
|
|
si->si_dt = sh->spx_dt;
|
|
si->si_cc |= sh->spx_cc & SPX_EM;
|
|
m0->m_len -= sizeof(*sh);
|
|
m0->m_data += sizeof(*sh);
|
|
len -= sizeof(*sh);
|
|
}
|
|
len += sizeof(*si);
|
|
if ((cb->s_flags2 & SF_NEWCALL) && recordp) {
|
|
si->si_cc |= SPX_EM;
|
|
spx_newchecks[8]++;
|
|
}
|
|
if (cb->s_oobflags & SF_SOOB) {
|
|
/*
|
|
* Per jqj@cornell: Make sure OB packets convey
|
|
* exactly 1 byte. If the packet is 1 byte or
|
|
* larger, we have already guaranted there to be at
|
|
* least one garbage byte for the checksum, and extra
|
|
* bytes shouldn't hurt!
|
|
*/
|
|
if (len > sizeof(*si)) {
|
|
si->si_cc |= SPX_OB;
|
|
len = (1 + sizeof(*si));
|
|
}
|
|
}
|
|
si->si_len = htons((u_short)len);
|
|
m->m_pkthdr.len = ((len - 1) | 1) + 1;
|
|
|
|
/*
|
|
* Queue stuff up for output.
|
|
*/
|
|
sbappendrecord(sb, m);
|
|
cb->s_seq++;
|
|
}
|
|
#ifdef notdef
|
|
idle = (cb->s_smax == (cb->s_rack - 1));
|
|
#endif
|
|
again:
|
|
sendalot = 0;
|
|
off = cb->s_snxt - cb->s_rack;
|
|
win = min(cb->s_swnd, (cb->s_cwnd / CUNIT));
|
|
|
|
/*
|
|
* If in persist timeout with window of 0, send a probe. Otherwise,
|
|
* if window is small but nonzero and timer expired, send what we can
|
|
* and go into transmit state.
|
|
*/
|
|
if (cb->s_force == 1 + SPXT_PERSIST) {
|
|
if (win != 0) {
|
|
cb->s_timer[SPXT_PERSIST] = 0;
|
|
cb->s_rxtshift = 0;
|
|
}
|
|
}
|
|
span = cb->s_seq - cb->s_rack;
|
|
len = min(span, win) - off;
|
|
|
|
if (len < 0) {
|
|
/*
|
|
* Window shrank after we went into it. If window shrank to
|
|
* 0, cancel pending restransmission and pull s_snxt back to
|
|
* (closed) window. We will enter persist state below. If
|
|
* the widndow didn't close completely, just wait for an ACK.
|
|
*/
|
|
len = 0;
|
|
if (win == 0) {
|
|
cb->s_timer[SPXT_REXMT] = 0;
|
|
cb->s_snxt = cb->s_rack;
|
|
}
|
|
}
|
|
if (len > 1)
|
|
sendalot = 1;
|
|
rcv_win = sbspace(&so->so_rcv);
|
|
|
|
/*
|
|
* Send if we owe peer an ACK.
|
|
*/
|
|
if (cb->s_oobflags & SF_SOOB) {
|
|
/*
|
|
* Must transmit this out of band packet.
|
|
*/
|
|
cb->s_oobflags &= ~ SF_SOOB;
|
|
sendalot = 1;
|
|
spxstat.spxs_sndurg++;
|
|
goto found;
|
|
}
|
|
if (cb->s_flags & SF_ACKNOW)
|
|
goto send;
|
|
if (cb->s_state < TCPS_ESTABLISHED)
|
|
goto send;
|
|
|
|
/*
|
|
* Silly window can't happen in spx. Code from TCP deleted.
|
|
*/
|
|
if (len)
|
|
goto send;
|
|
|
|
/*
|
|
* Compare available window to amount of window known to peer (as
|
|
* advertised window less next expected input.) If the difference is
|
|
* at least two packets or at least 35% of the mximum possible
|
|
* window, then want to send a window update to peer.
|
|
*/
|
|
if (rcv_win > 0) {
|
|
u_short delta = 1 + cb->s_alo - cb->s_ack;
|
|
int adv = rcv_win - (delta * cb->s_mtu);
|
|
|
|
if ((so->so_rcv.sb_cc == 0 && adv >= (2 * cb->s_mtu)) ||
|
|
(100 * adv / so->so_rcv.sb_hiwat >= 35)) {
|
|
spxstat.spxs_sndwinup++;
|
|
cb->s_flags |= SF_ACKNOW;
|
|
goto send;
|
|
}
|
|
|
|
}
|
|
|
|
/*
|
|
* Many comments from tcp_output.c are appropriate here including ...
|
|
* If send window is too small, there is data to transmit, and no
|
|
* retransmit or persist is pending, then go to persist state. If
|
|
* nothing happens soon, send when timer expires: if window is
|
|
* nonzero, transmit what we can, otherwise send a probe.
|
|
*/
|
|
if (so->so_snd.sb_cc && cb->s_timer[SPXT_REXMT] == 0 &&
|
|
cb->s_timer[SPXT_PERSIST] == 0) {
|
|
cb->s_rxtshift = 0;
|
|
spx_setpersist(cb);
|
|
}
|
|
|
|
/*
|
|
* No reason to send a packet, just return.
|
|
*/
|
|
cb->s_outx = 1;
|
|
return (0);
|
|
|
|
send:
|
|
/*
|
|
* Find requested packet.
|
|
*/
|
|
si = 0;
|
|
if (len > 0) {
|
|
cb->s_want = cb->s_snxt;
|
|
for (m = sb->sb_mb; m != NULL; m = m->m_act) {
|
|
si = mtod(m, struct spx *);
|
|
if (SSEQ_LEQ(cb->s_snxt, si->si_seq))
|
|
break;
|
|
}
|
|
found:
|
|
if (si != NULL) {
|
|
if (si->si_seq == cb->s_snxt)
|
|
cb->s_snxt++;
|
|
else
|
|
spxstat.spxs_sndvoid++, si = 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Update window.
|
|
*/
|
|
if (rcv_win < 0)
|
|
rcv_win = 0;
|
|
alo = cb->s_ack - 1 + (rcv_win / ((short)cb->s_mtu));
|
|
if (SSEQ_LT(alo, cb->s_alo))
|
|
alo = cb->s_alo;
|
|
|
|
if (si != NULL) {
|
|
/*
|
|
* Must make a copy of this packet for ipx_output to monkey
|
|
* with.
|
|
*/
|
|
m = m_copy(dtom(si), 0, (int)M_COPYALL);
|
|
if (m == NULL)
|
|
return (ENOBUFS);
|
|
si = mtod(m, struct spx *);
|
|
if (SSEQ_LT(si->si_seq, cb->s_smax))
|
|
spxstat.spxs_sndrexmitpack++;
|
|
else
|
|
spxstat.spxs_sndpack++;
|
|
} else if (cb->s_force || cb->s_flags & SF_ACKNOW) {
|
|
/*
|
|
* Must send an acknowledgement or a probe.
|
|
*/
|
|
if (cb->s_force)
|
|
spxstat.spxs_sndprobe++;
|
|
if (cb->s_flags & SF_ACKNOW)
|
|
spxstat.spxs_sndacks++;
|
|
m = m_gethdr(M_DONTWAIT, MT_DATA);
|
|
if (m == NULL)
|
|
return (ENOBUFS);
|
|
|
|
/*
|
|
* Fill in mbuf with extended SP header and addresses and
|
|
* length put into network format.
|
|
*/
|
|
MH_ALIGN(m, sizeof(struct spx));
|
|
m->m_len = sizeof(*si);
|
|
m->m_pkthdr.len = sizeof(*si);
|
|
si = mtod(m, struct spx *);
|
|
si->si_i = *cb->s_ipx;
|
|
si->si_s = cb->s_shdr;
|
|
si->si_seq = cb->s_smax + 1;
|
|
si->si_len = htons(sizeof(*si));
|
|
si->si_cc |= SPX_SP;
|
|
} else {
|
|
cb->s_outx = 3;
|
|
if (so->so_options & SO_DEBUG || traceallspxs)
|
|
spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
|
|
return (0);
|
|
}
|
|
/*
|
|
* Stuff checksum and output datagram.
|
|
*/
|
|
if ((si->si_cc & SPX_SP) == 0) {
|
|
if (cb->s_force != (1 + SPXT_PERSIST) ||
|
|
cb->s_timer[SPXT_PERSIST] == 0) {
|
|
/*
|
|
* If this is a new packet and we are not currently
|
|
* timing anything, time this one.
|
|
*/
|
|
if (SSEQ_LT(cb->s_smax, si->si_seq)) {
|
|
cb->s_smax = si->si_seq;
|
|
if (cb->s_rtt == 0) {
|
|
spxstat.spxs_segstimed++;
|
|
cb->s_rtseq = si->si_seq;
|
|
cb->s_rtt = 1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Set rexmt timer if not currently set, initial
|
|
* value for retransmit timer is smoothed round-trip
|
|
* time + 2 * round-trip time variance. Initialize
|
|
* shift counter which is used for backoff of
|
|
* retransmit time.
|
|
*/
|
|
if (cb->s_timer[SPXT_REXMT] == 0 &&
|
|
cb->s_snxt != cb->s_rack) {
|
|
cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
|
|
if (cb->s_timer[SPXT_PERSIST]) {
|
|
cb->s_timer[SPXT_PERSIST] = 0;
|
|
cb->s_rxtshift = 0;
|
|
}
|
|
}
|
|
} else if (SSEQ_LT(cb->s_smax, si->si_seq))
|
|
cb->s_smax = si->si_seq;
|
|
} else if (cb->s_state < TCPS_ESTABLISHED) {
|
|
if (cb->s_rtt == 0)
|
|
cb->s_rtt = 1; /* Time initial handshake */
|
|
if (cb->s_timer[SPXT_REXMT] == 0)
|
|
cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
|
|
}
|
|
|
|
/*
|
|
* Do not request acks when we ack their data packets or when we do a
|
|
* gratuitous window update.
|
|
*/
|
|
if (((si->si_cc & SPX_SP) == 0) || cb->s_force)
|
|
si->si_cc |= SPX_SA;
|
|
si->si_seq = htons(si->si_seq);
|
|
si->si_alo = htons(alo);
|
|
si->si_ack = htons(cb->s_ack);
|
|
|
|
if (ipxcksum)
|
|
si->si_sum = ipx_cksum(m, ntohs(si->si_len));
|
|
else
|
|
si->si_sum = 0xffff;
|
|
|
|
cb->s_outx = 4;
|
|
if (so->so_options & SO_DEBUG || traceallspxs)
|
|
spx_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
|
|
|
|
if (so->so_options & SO_DONTROUTE)
|
|
error = ipx_outputfl(m, NULL, IPX_ROUTETOIF);
|
|
else
|
|
error = ipx_outputfl(m, &cb->s_ipxpcb->ipxp_route, 0);
|
|
if (error)
|
|
return (error);
|
|
spxstat.spxs_sndtotal++;
|
|
|
|
/*
|
|
* Data sent (as far as we can tell). If this advertises a larger
|
|
* window than any other segment, then remember the size of the
|
|
* advertized window. Any pending ACK has now been sent.
|
|
*/
|
|
cb->s_force = 0;
|
|
cb->s_flags &= ~(SF_ACKNOW|SF_DELACK);
|
|
if (SSEQ_GT(alo, cb->s_alo))
|
|
cb->s_alo = alo;
|
|
if (sendalot)
|
|
goto again;
|
|
cb->s_outx = 5;
|
|
return (0);
|
|
}
|
|
|
|
static int spx_do_persist_panics = 0;
|
|
|
|
static void
|
|
spx_setpersist(struct spxpcb *cb)
|
|
{
|
|
int t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
|
|
|
|
IPX_LOCK_ASSERT(cb->s_ipxpcb);
|
|
|
|
if (cb->s_timer[SPXT_REXMT] && spx_do_persist_panics)
|
|
panic("spx_output REXMT");
|
|
|
|
/*
|
|
* Start/restart persistance timer.
|
|
*/
|
|
SPXT_RANGESET(cb->s_timer[SPXT_PERSIST],
|
|
t*spx_backoff[cb->s_rxtshift],
|
|
SPXTV_PERSMIN, SPXTV_PERSMAX);
|
|
if (cb->s_rxtshift < SPX_MAXRXTSHIFT)
|
|
cb->s_rxtshift++;
|
|
}
|
|
|
|
int
|
|
spx_ctloutput(struct socket *so, struct sockopt *sopt)
|
|
{
|
|
struct spxhdr spxhdr;
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int mask, error;
|
|
short soptval;
|
|
u_short usoptval;
|
|
int optval;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_ctloutput: ipxp == NULL"));
|
|
|
|
/*
|
|
* This will have to be changed when we do more general stacking of
|
|
* protocols.
|
|
*/
|
|
if (sopt->sopt_level != IPXPROTO_SPX)
|
|
return (ipx_ctloutput(so, sopt));
|
|
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
IPX_UNLOCK(ipxp);
|
|
return (ECONNRESET);
|
|
}
|
|
|
|
IPX_LOCK(ipxp);
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_ctloutput: cb == NULL"));
|
|
|
|
error = 0;
|
|
switch (sopt->sopt_dir) {
|
|
case SOPT_GET:
|
|
switch (sopt->sopt_name) {
|
|
case SO_HEADERS_ON_INPUT:
|
|
mask = SF_HI;
|
|
goto get_flags;
|
|
|
|
case SO_HEADERS_ON_OUTPUT:
|
|
mask = SF_HO;
|
|
get_flags:
|
|
soptval = cb->s_flags & mask;
|
|
IPX_UNLOCK(ipxp);
|
|
error = sooptcopyout(sopt, &soptval,
|
|
sizeof(soptval));
|
|
break;
|
|
|
|
case SO_MTU:
|
|
usoptval = cb->s_mtu;
|
|
IPX_UNLOCK(ipxp);
|
|
error = sooptcopyout(sopt, &usoptval,
|
|
sizeof(usoptval));
|
|
break;
|
|
|
|
case SO_LAST_HEADER:
|
|
spxhdr = cb->s_rhdr;
|
|
IPX_UNLOCK(ipxp);
|
|
error = sooptcopyout(sopt, &spxhdr, sizeof(spxhdr));
|
|
break;
|
|
|
|
case SO_DEFAULT_HEADERS:
|
|
spxhdr = cb->s_shdr;
|
|
IPX_UNLOCK(ipxp);
|
|
error = sooptcopyout(sopt, &spxhdr, sizeof(spxhdr));
|
|
break;
|
|
|
|
default:
|
|
IPX_UNLOCK(ipxp);
|
|
error = ENOPROTOOPT;
|
|
}
|
|
break;
|
|
|
|
case SOPT_SET:
|
|
/*
|
|
* XXX Why are these shorts on get and ints on set? That
|
|
* doesn't make any sense...
|
|
*
|
|
* XXXRW: Note, when we re-acquire the ipxp lock, we should
|
|
* re-check that it's not dropped.
|
|
*/
|
|
IPX_UNLOCK(ipxp);
|
|
switch (sopt->sopt_name) {
|
|
case SO_HEADERS_ON_INPUT:
|
|
mask = SF_HI;
|
|
goto set_head;
|
|
|
|
case SO_HEADERS_ON_OUTPUT:
|
|
mask = SF_HO;
|
|
set_head:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
|
|
IPX_LOCK(ipxp);
|
|
if (cb->s_flags & SF_PI) {
|
|
if (optval)
|
|
cb->s_flags |= mask;
|
|
else
|
|
cb->s_flags &= ~mask;
|
|
} else error = EINVAL;
|
|
IPX_UNLOCK(ipxp);
|
|
break;
|
|
|
|
case SO_MTU:
|
|
error = sooptcopyin(sopt, &usoptval, sizeof usoptval,
|
|
sizeof usoptval);
|
|
if (error)
|
|
break;
|
|
/* Unlocked write. */
|
|
cb->s_mtu = usoptval;
|
|
break;
|
|
|
|
#ifdef SF_NEWCALL
|
|
case SO_NEWCALL:
|
|
error = sooptcopyin(sopt, &optval, sizeof optval,
|
|
sizeof optval);
|
|
if (error)
|
|
break;
|
|
IPX_LOCK(ipxp);
|
|
if (optval) {
|
|
cb->s_flags2 |= SF_NEWCALL;
|
|
spx_newchecks[5]++;
|
|
} else {
|
|
cb->s_flags2 &= ~SF_NEWCALL;
|
|
spx_newchecks[6]++;
|
|
}
|
|
IPX_UNLOCK(ipxp);
|
|
break;
|
|
#endif
|
|
|
|
case SO_DEFAULT_HEADERS:
|
|
{
|
|
struct spxhdr sp;
|
|
|
|
error = sooptcopyin(sopt, &sp, sizeof sp,
|
|
sizeof sp);
|
|
if (error)
|
|
break;
|
|
IPX_LOCK(ipxp);
|
|
cb->s_dt = sp.spx_dt;
|
|
cb->s_cc = sp.spx_cc & SPX_EM;
|
|
IPX_UNLOCK(ipxp);
|
|
}
|
|
break;
|
|
|
|
default:
|
|
error = ENOPROTOOPT;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
panic("spx_ctloutput: bad socket option direction");
|
|
}
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
spx_usr_abort(struct socket *so)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_usr_abort: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_usr_abort: cb == NULL"));
|
|
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
spx_drop(cb, ECONNABORTED);
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Accept a connection. Essentially all the work is done at higher levels;
|
|
* just return the address of the peer, storing through addr.
|
|
*/
|
|
static int
|
|
spx_accept(struct socket *so, struct sockaddr **nam)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct sockaddr_ipx *sipx, ssipx;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_accept: ipxp == NULL"));
|
|
|
|
sipx = &ssipx;
|
|
bzero(sipx, sizeof *sipx);
|
|
sipx->sipx_len = sizeof *sipx;
|
|
sipx->sipx_family = AF_IPX;
|
|
IPX_LOCK(ipxp);
|
|
sipx->sipx_addr = ipxp->ipxp_faddr;
|
|
IPX_UNLOCK(ipxp);
|
|
*nam = sodupsockaddr((struct sockaddr *)sipx, M_WAITOK);
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
spx_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
struct mbuf *mm;
|
|
struct sockbuf *sb;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp == NULL, ("spx_attach: ipxp != NULL"));
|
|
|
|
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
|
|
error = soreserve(so, (u_long) 3072, (u_long) 3072);
|
|
if (error)
|
|
return (error);
|
|
}
|
|
|
|
MALLOC(cb, struct spxpcb *, sizeof *cb, M_PCB, M_NOWAIT | M_ZERO);
|
|
if (cb == NULL)
|
|
return (ENOBUFS);
|
|
mm = m_getclr(M_DONTWAIT, MT_DATA);
|
|
if (mm == NULL) {
|
|
FREE(cb, M_PCB);
|
|
return (ENOBUFS);
|
|
}
|
|
|
|
IPX_LIST_LOCK();
|
|
error = ipx_pcballoc(so, &ipxpcb_list, td);
|
|
if (error) {
|
|
IPX_LIST_UNLOCK();
|
|
m_free(mm);
|
|
FREE(cb, M_PCB);
|
|
return (error);
|
|
}
|
|
ipxp = sotoipxpcb(so);
|
|
ipxp->ipxp_flags |= IPXP_SPX;
|
|
|
|
cb->s_ipx = mtod(mm, struct ipx *);
|
|
cb->s_state = TCPS_LISTEN;
|
|
cb->s_smax = -1;
|
|
cb->s_swl1 = -1;
|
|
cb->s_q.si_next = cb->s_q.si_prev = &cb->s_q;
|
|
cb->s_ipxpcb = ipxp;
|
|
cb->s_mtu = 576 - sizeof(struct spx);
|
|
sb = &so->so_snd;
|
|
cb->s_cwnd = sbspace(sb) * CUNIT / cb->s_mtu;
|
|
cb->s_ssthresh = cb->s_cwnd;
|
|
cb->s_cwmx = sbspace(sb) * CUNIT / (2 * sizeof(struct spx));
|
|
/*
|
|
* Above is recomputed when connecting to account for changed
|
|
* buffering or mtu's.
|
|
*/
|
|
cb->s_rtt = SPXTV_SRTTBASE;
|
|
cb->s_rttvar = SPXTV_SRTTDFLT << 2;
|
|
SPXT_RANGESET(cb->s_rxtcur,
|
|
((SPXTV_SRTTBASE >> 2) + (SPXTV_SRTTDFLT << 2)) >> 1,
|
|
SPXTV_MIN, SPXTV_REXMTMAX);
|
|
ipxp->ipxp_pcb = (caddr_t)cb;
|
|
IPX_LIST_UNLOCK();
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
spx_pcbdetach(struct ipxpcb *ipxp)
|
|
{
|
|
struct spxpcb *cb;
|
|
struct spx_q *s;
|
|
struct mbuf *m;
|
|
|
|
IPX_LOCK_ASSERT(ipxp);
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_pcbdetach: cb == NULL"));
|
|
|
|
s = cb->s_q.si_next;
|
|
while (s != &(cb->s_q)) {
|
|
s = s->si_next;
|
|
remque(s);
|
|
m = dtom(s);
|
|
m_freem(m);
|
|
}
|
|
m_free(dtom(cb->s_ipx));
|
|
FREE(cb, M_PCB);
|
|
ipxp->ipxp_pcb = NULL;
|
|
}
|
|
|
|
static int
|
|
spx_bind(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_bind: ipxp == NULL"));
|
|
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
error = ipx_pcbbind(ipxp, nam, td);
|
|
out:
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
spx_usr_close(struct socket *so)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_usr_close: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_usr_close: cb == NULL"));
|
|
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
if (cb->s_state > TCPS_LISTEN)
|
|
spx_disconnect(cb);
|
|
else
|
|
spx_close(cb);
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* Initiate connection to peer. Enter SYN_SENT state, and mark socket as
|
|
* connecting. Start keep-alive timer, setup prototype header, send initial
|
|
* system packet requesting connection.
|
|
*/
|
|
static int
|
|
spx_connect(struct socket *so, struct sockaddr *nam, struct thread *td)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_connect: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_connect: cb == NULL"));
|
|
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = EINVAL;
|
|
goto spx_connect_end;
|
|
}
|
|
if (ipxp->ipxp_lport == 0) {
|
|
error = ipx_pcbbind(ipxp, NULL, td);
|
|
if (error)
|
|
goto spx_connect_end;
|
|
}
|
|
error = ipx_pcbconnect(ipxp, nam, td);
|
|
if (error)
|
|
goto spx_connect_end;
|
|
soisconnecting(so);
|
|
spxstat.spxs_connattempt++;
|
|
cb->s_state = TCPS_SYN_SENT;
|
|
cb->s_did = 0;
|
|
spx_template(cb);
|
|
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
|
|
cb->s_force = 1 + SPXTV_KEEP;
|
|
/*
|
|
* Other party is required to respond to the port I send from, but he
|
|
* is not required to answer from where I am sending to, so allow
|
|
* wildcarding. Original port I am sending to is still saved in
|
|
* cb->s_dport.
|
|
*/
|
|
ipxp->ipxp_fport = 0;
|
|
error = spx_output(cb, NULL);
|
|
spx_connect_end:
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
spx_detach(struct socket *so)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
|
|
/*
|
|
* XXXRW: Should assert appropriately detached.
|
|
*/
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_detach: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_detach: cb == NULL"));
|
|
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
spx_pcbdetach(ipxp);
|
|
ipx_pcbfree(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* We may decide later to implement connection closing handshaking at the spx
|
|
* level optionally. Here is the hook to do it:
|
|
*/
|
|
static int
|
|
spx_usr_disconnect(struct socket *so)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_usr_disconnect: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_usr_disconnect: cb == NULL"));
|
|
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
spx_disconnect(cb);
|
|
error = 0;
|
|
out:
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
spx_listen(struct socket *so, int backlog, struct thread *td)
|
|
{
|
|
int error;
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
|
|
error = 0;
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_listen: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_listen: cb == NULL"));
|
|
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
SOCK_LOCK(so);
|
|
error = solisten_proto_check(so);
|
|
if (error == 0 && ipxp->ipxp_lport == 0)
|
|
error = ipx_pcbbind(ipxp, NULL, td);
|
|
if (error == 0) {
|
|
cb->s_state = TCPS_LISTEN;
|
|
solisten_proto(so, backlog);
|
|
}
|
|
SOCK_UNLOCK(so);
|
|
out:
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
/*
|
|
* After a receive, possibly send acknowledgment updating allocation.
|
|
*/
|
|
static int
|
|
spx_rcvd(struct socket *so, int flags)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_rcvd: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_rcvd: cb == NULL"));
|
|
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
cb->s_flags |= SF_RVD;
|
|
spx_output(cb, NULL);
|
|
cb->s_flags &= ~SF_RVD;
|
|
error = 0;
|
|
out:
|
|
IPX_UNLOCK(ipxp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
spx_rcvoob(struct socket *so, struct mbuf *m, int flags)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_rcvoob: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_rcvoob: cb == NULL"));
|
|
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
SOCKBUF_LOCK(&so->so_rcv);
|
|
if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark ||
|
|
(so->so_rcv.sb_state & SBS_RCVATMARK)) {
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
m->m_len = 1;
|
|
*mtod(m, caddr_t) = cb->s_iobc;
|
|
error = 0;
|
|
goto out;
|
|
}
|
|
SOCKBUF_UNLOCK(&so->so_rcv);
|
|
error = EINVAL;
|
|
out:
|
|
IPX_UNLOCK(ipxp);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
spx_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
|
|
struct mbuf *controlp, struct thread *td)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_send: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_send: cb == NULL"));
|
|
|
|
error = 0;
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = ECONNRESET;
|
|
goto spx_send_end;
|
|
}
|
|
if (flags & PRUS_OOB) {
|
|
if (sbspace(&so->so_snd) < -512) {
|
|
error = ENOBUFS;
|
|
goto spx_send_end;
|
|
}
|
|
cb->s_oobflags |= SF_SOOB;
|
|
}
|
|
if (controlp != NULL) {
|
|
u_short *p = mtod(controlp, u_short *);
|
|
spx_newchecks[2]++;
|
|
if ((p[0] == 5) && (p[1] == 1)) { /* XXXX, for testing */
|
|
cb->s_shdr.spx_dt = *(u_char *)(&p[2]);
|
|
spx_newchecks[3]++;
|
|
}
|
|
m_freem(controlp);
|
|
}
|
|
controlp = NULL;
|
|
error = spx_output(cb, m);
|
|
m = NULL;
|
|
spx_send_end:
|
|
IPX_UNLOCK(ipxp);
|
|
if (controlp != NULL)
|
|
m_freem(controlp);
|
|
if (m != NULL)
|
|
m_freem(m);
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
spx_shutdown(struct socket *so)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int error;
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_shutdown: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_shutdown: cb == NULL"));
|
|
|
|
socantsendmore(so);
|
|
IPX_LIST_LOCK();
|
|
IPX_LOCK(ipxp);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED) {
|
|
error = EINVAL;
|
|
goto out;
|
|
}
|
|
spx_usrclosed(cb);
|
|
error = 0;
|
|
out:
|
|
IPX_UNLOCK(ipxp);
|
|
IPX_LIST_UNLOCK();
|
|
return (error);
|
|
}
|
|
|
|
static int
|
|
spx_sp_attach(struct socket *so, int proto, struct thread *td)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int error;
|
|
|
|
KASSERT(so->so_pcb == NULL, ("spx_sp_attach: so_pcb != NULL"));
|
|
|
|
error = spx_attach(so, proto, td);
|
|
if (error)
|
|
return (error);
|
|
|
|
ipxp = sotoipxpcb(so);
|
|
KASSERT(ipxp != NULL, ("spx_sp_attach: ipxp == NULL"));
|
|
|
|
cb = ipxtospxpcb(ipxp);
|
|
KASSERT(cb != NULL, ("spx_sp_attach: cb == NULL"));
|
|
|
|
IPX_LOCK(ipxp);
|
|
cb->s_flags |= (SF_HI | SF_HO | SF_PI);
|
|
IPX_UNLOCK(ipxp);
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Create template to be used to send spx packets on a connection. Called
|
|
* after host entry created, fills in a skeletal spx header (choosing
|
|
* connection id), minimizing the amount of work necessary when the
|
|
* connection is used.
|
|
*/
|
|
static void
|
|
spx_template(struct spxpcb *cb)
|
|
{
|
|
struct ipxpcb *ipxp = cb->s_ipxpcb;
|
|
struct ipx *ipx = cb->s_ipx;
|
|
struct sockbuf *sb = &(ipxp->ipxp_socket->so_snd);
|
|
|
|
IPX_LOCK_ASSERT(ipxp);
|
|
|
|
ipx->ipx_pt = IPXPROTO_SPX;
|
|
ipx->ipx_sna = ipxp->ipxp_laddr;
|
|
ipx->ipx_dna = ipxp->ipxp_faddr;
|
|
SPX_LOCK();
|
|
cb->s_sid = htons(spx_iss);
|
|
spx_iss += SPX_ISSINCR/2;
|
|
SPX_UNLOCK();
|
|
cb->s_alo = 1;
|
|
cb->s_cwnd = (sbspace(sb) * CUNIT) / cb->s_mtu;
|
|
/* Try to expand fast to full complement of large packets. */
|
|
cb->s_ssthresh = cb->s_cwnd;
|
|
cb->s_cwmx = (sbspace(sb) * CUNIT) / (2 * sizeof(struct spx));
|
|
/* But allow for lots of little packets as well. */
|
|
cb->s_cwmx = max(cb->s_cwmx, cb->s_cwnd);
|
|
}
|
|
|
|
/*
|
|
* Close a SPIP control block. Wake up any sleepers. We used to free any
|
|
* queued packets and cb->s_ipx here, but now we defer that until the pcb is
|
|
* discarded.
|
|
*/
|
|
void
|
|
spx_close(struct spxpcb *cb)
|
|
{
|
|
struct ipxpcb *ipxp = cb->s_ipxpcb;
|
|
struct socket *so = ipxp->ipxp_socket;
|
|
|
|
KASSERT(ipxp != NULL, ("spx_close: ipxp == NULL"));
|
|
IPX_LIST_LOCK_ASSERT();
|
|
IPX_LOCK_ASSERT(ipxp);
|
|
|
|
ipxp->ipxp_flags |= IPXP_DROPPED;
|
|
soisdisconnected(so);
|
|
spxstat.spxs_closed++;
|
|
}
|
|
|
|
/*
|
|
* Someday we may do level 3 handshaking to close a connection or send a
|
|
* xerox style error. For now, just close. cb will always be invalid after
|
|
* this call.
|
|
*/
|
|
static void
|
|
spx_usrclosed(struct spxpcb *cb)
|
|
{
|
|
|
|
IPX_LIST_LOCK_ASSERT();
|
|
IPX_LOCK_ASSERT(cb->s_ipxpcb);
|
|
|
|
spx_close(cb);
|
|
}
|
|
|
|
/*
|
|
* cb will always be invalid after this call.
|
|
*/
|
|
static void
|
|
spx_disconnect(struct spxpcb *cb)
|
|
{
|
|
|
|
IPX_LIST_LOCK_ASSERT();
|
|
IPX_LOCK_ASSERT(cb->s_ipxpcb);
|
|
|
|
spx_close(cb);
|
|
}
|
|
|
|
/*
|
|
* Drop connection, reporting the specified error. cb will always be invalid
|
|
* after this call.
|
|
*/
|
|
static void
|
|
spx_drop(struct spxpcb *cb, int errno)
|
|
{
|
|
struct socket *so = cb->s_ipxpcb->ipxp_socket;
|
|
|
|
IPX_LIST_LOCK_ASSERT();
|
|
IPX_LOCK_ASSERT(cb->s_ipxpcb);
|
|
|
|
/*
|
|
* Someday, in the xerox world we will generate error protocol
|
|
* packets announcing that the socket has gone away.
|
|
*/
|
|
if (TCPS_HAVERCVDSYN(cb->s_state)) {
|
|
spxstat.spxs_drops++;
|
|
cb->s_state = TCPS_CLOSED;
|
|
/*tcp_output(cb);*/
|
|
} else
|
|
spxstat.spxs_conndrops++;
|
|
so->so_error = errno;
|
|
spx_close(cb);
|
|
}
|
|
|
|
/*
|
|
* Fast timeout routine for processing delayed acks.
|
|
*/
|
|
void
|
|
spx_fasttimo(void)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
|
|
IPX_LIST_LOCK();
|
|
LIST_FOREACH(ipxp, &ipxpcb_list, ipxp_list) {
|
|
IPX_LOCK(ipxp);
|
|
if (!(ipxp->ipxp_flags & IPXP_SPX) ||
|
|
(ipxp->ipxp_flags & IPXP_DROPPED)) {
|
|
IPX_UNLOCK(ipxp);
|
|
continue;
|
|
}
|
|
cb = ipxtospxpcb(ipxp);
|
|
if (cb->s_flags & SF_DELACK) {
|
|
cb->s_flags &= ~SF_DELACK;
|
|
cb->s_flags |= SF_ACKNOW;
|
|
spxstat.spxs_delack++;
|
|
spx_output(cb, NULL);
|
|
}
|
|
IPX_UNLOCK(ipxp);
|
|
}
|
|
IPX_LIST_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* spx protocol timeout routine called every 500 ms. Updates the timers in
|
|
* all active pcb's and causes finite state machine actions if timers expire.
|
|
*/
|
|
void
|
|
spx_slowtimo(void)
|
|
{
|
|
struct ipxpcb *ipxp;
|
|
struct spxpcb *cb;
|
|
int i;
|
|
|
|
/*
|
|
* Search through tcb's and update active timers. Once, timers could
|
|
* free ipxp's, but now we do that only when detaching a socket.
|
|
*/
|
|
IPX_LIST_LOCK();
|
|
LIST_FOREACH(ipxp, &ipxpcb_list, ipxp_list) {
|
|
IPX_LOCK(ipxp);
|
|
if (!(ipxp->ipxp_flags & IPXP_SPX) ||
|
|
(ipxp->ipxp_flags & IPXP_DROPPED)) {
|
|
IPX_UNLOCK(ipxp);
|
|
continue;
|
|
}
|
|
|
|
cb = (struct spxpcb *)ipxp->ipxp_pcb;
|
|
KASSERT(cb != NULL, ("spx_slowtimo: cb == NULL"));
|
|
for (i = 0; i < SPXT_NTIMERS; i++) {
|
|
if (cb->s_timer[i] && --cb->s_timer[i] == 0) {
|
|
spx_timers(cb, i);
|
|
if (ipxp->ipxp_flags & IPXP_DROPPED)
|
|
break;
|
|
}
|
|
}
|
|
if (!(ipxp->ipxp_flags & IPXP_DROPPED)) {
|
|
cb->s_idle++;
|
|
if (cb->s_rtt)
|
|
cb->s_rtt++;
|
|
}
|
|
IPX_UNLOCK(ipxp);
|
|
}
|
|
IPX_LIST_UNLOCK();
|
|
SPX_LOCK();
|
|
spx_iss += SPX_ISSINCR/PR_SLOWHZ; /* increment iss */
|
|
SPX_UNLOCK();
|
|
}
|
|
|
|
/*
|
|
* SPX timer processing.
|
|
*/
|
|
static void
|
|
spx_timers(struct spxpcb *cb, int timer)
|
|
{
|
|
long rexmt;
|
|
int win;
|
|
|
|
IPX_LIST_LOCK_ASSERT();
|
|
IPX_LOCK_ASSERT(cb->s_ipxpcb);
|
|
|
|
cb->s_force = 1 + timer;
|
|
switch (timer) {
|
|
case SPXT_2MSL:
|
|
/*
|
|
* 2 MSL timeout in shutdown went off. TCP deletes
|
|
* connection control block.
|
|
*/
|
|
printf("spx: SPXT_2MSL went off for no reason\n");
|
|
cb->s_timer[timer] = 0;
|
|
break;
|
|
|
|
case SPXT_REXMT:
|
|
/*
|
|
* Retransmission timer went off. Message has not been acked
|
|
* within retransmit interval. Back off to a longer
|
|
* retransmit interval and retransmit one packet.
|
|
*/
|
|
if (++cb->s_rxtshift > SPX_MAXRXTSHIFT) {
|
|
cb->s_rxtshift = SPX_MAXRXTSHIFT;
|
|
spxstat.spxs_timeoutdrop++;
|
|
spx_drop(cb, ETIMEDOUT);
|
|
break;
|
|
}
|
|
spxstat.spxs_rexmttimeo++;
|
|
rexmt = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
|
|
rexmt *= spx_backoff[cb->s_rxtshift];
|
|
SPXT_RANGESET(cb->s_rxtcur, rexmt, SPXTV_MIN, SPXTV_REXMTMAX);
|
|
cb->s_timer[SPXT_REXMT] = cb->s_rxtcur;
|
|
|
|
/*
|
|
* If we have backed off fairly far, our srtt estimate is
|
|
* probably bogus. Clobber it so we'll take the next rtt
|
|
* measurement as our srtt; move the current srtt into rttvar
|
|
* to keep the current retransmit times until then.
|
|
*/
|
|
if (cb->s_rxtshift > SPX_MAXRXTSHIFT / 4 ) {
|
|
cb->s_rttvar += (cb->s_srtt >> 2);
|
|
cb->s_srtt = 0;
|
|
}
|
|
cb->s_snxt = cb->s_rack;
|
|
|
|
/*
|
|
* If timing a packet, stop the timer.
|
|
*/
|
|
cb->s_rtt = 0;
|
|
|
|
/*
|
|
* See very long discussion in tcp_timer.c about congestion
|
|
* window and sstrhesh.
|
|
*/
|
|
win = min(cb->s_swnd, (cb->s_cwnd/CUNIT)) / 2;
|
|
if (win < 2)
|
|
win = 2;
|
|
cb->s_cwnd = CUNIT;
|
|
cb->s_ssthresh = win * CUNIT;
|
|
spx_output(cb, NULL);
|
|
break;
|
|
|
|
case SPXT_PERSIST:
|
|
/*
|
|
* Persistance timer into zero window. Force a probe to be
|
|
* sent.
|
|
*/
|
|
spxstat.spxs_persisttimeo++;
|
|
spx_setpersist(cb);
|
|
spx_output(cb, NULL);
|
|
break;
|
|
|
|
case SPXT_KEEP:
|
|
/*
|
|
* Keep-alive timer went off; send something or drop
|
|
* connection if idle for too long.
|
|
*/
|
|
spxstat.spxs_keeptimeo++;
|
|
if (cb->s_state < TCPS_ESTABLISHED)
|
|
goto dropit;
|
|
if (cb->s_ipxpcb->ipxp_socket->so_options & SO_KEEPALIVE) {
|
|
if (cb->s_idle >= SPXTV_MAXIDLE)
|
|
goto dropit;
|
|
spxstat.spxs_keepprobe++;
|
|
spx_output(cb, NULL);
|
|
} else
|
|
cb->s_idle = 0;
|
|
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
|
|
break;
|
|
|
|
dropit:
|
|
spxstat.spxs_keepdrops++;
|
|
spx_drop(cb, ETIMEDOUT);
|
|
break;
|
|
|
|
default:
|
|
panic("spx_timers: unknown timer %d", timer);
|
|
}
|
|
}
|