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freebsd-dev/sys/netipx/spx_usrreq.c
Bruce Evans bc9eb1f2fe Eliminated sloppy common-style declarations. Now there are no duplicated 
common labels for LINT.  There are still some common declarations for the
!KERNEL case in tcp_debug.h and spx_debug.h.  trpt depends on the ones in
tcp_debug.h.
1996-04-13 12:53:53 +00:00

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/*
* Copyright (c) 1995, Mike Mitchell
* Copyright (c) 1984, 1985, 1986, 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)spx_usrreq.h
*
* $Id: spx_usrreq.c,v 1.7 1995/12/16 02:14:35 bde Exp $
*/
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/queue.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/errno.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/tcp_fsm.h>
#include <netipx/ipx.h>
#include <netipx/ipx_pcb.h>
#include <netipx/ipx_var.h>
#include <netipx/ipx_error.h>
#include <netipx/spx.h>
#include <netipx/spx_timer.h>
#include <netipx/spx_var.h>
#include <netipx/spx_debug.h>
/*
* SPX protocol implementation.
*/
struct spx spx_savesi;
int traceallspxs = 0;
int spx_hardnosed;
int spx_use_delack = 0;
u_short spx_newchecks[50];
struct spx_istat spx_istat;
u_short spx_iss;
void
spx_init()
{
spx_iss = 1; /* WRONG !! should fish it out of TODR */
}
/*ARGSUSED*/
void
spx_input(m, ipxp)
register struct mbuf *m;
register struct ipxpcb *ipxp;
{
register struct spxpcb *cb;
register struct spx *si = mtod(m, struct spx *);
register struct socket *so;
int dropsocket = 0;
short ostate = 0;
spxstat.spxs_rcvtotal++;
if (ipxp == 0) {
panic("No ipxpcb in spx_input\n");
return;
}
cb = ipxtospxpcb(ipxp);
if (cb == 0) goto bad;
if (m->m_len < sizeof(*si)) {
if ((m = m_pullup(m, sizeof(*si))) == 0) {
spxstat.spxs_rcvshort++;
return;
}
si = mtod(m, struct spx *);
}
si->si_seq = ntohs(si->si_seq);
si->si_ack = ntohs(si->si_ack);
si->si_alo = ntohs(si->si_alo);
so = ipxp->ipxp_socket;
if (so->so_options & SO_DEBUG || traceallspxs) {
ostate = cb->s_state;
spx_savesi = *si;
}
if (so->so_options & SO_ACCEPTCONN) {
struct spxpcb *ocb = cb;
so = sonewconn(so, 0);
if (so == 0) {
goto drop;
}
/*
* This is ugly, but ....
*
* Mark socket as temporary until we're
* committed to keeping it. The code at
* ``drop'' and ``dropwithreset'' check the
* flag dropsocket to see if the temporary
* socket created here should be discarded.
* We mark the socket as discardable until
* we're committed to it below in TCPS_LISTEN.
*/
dropsocket++;
ipxp = (struct ipxpcb *)so->so_pcb;
ipxp->ipxp_laddr = si->si_dna;
cb = ipxtospxpcb(ipxp);
cb->s_mtu = ocb->s_mtu; /* preserve sockopts */
cb->s_flags = ocb->s_flags; /* preserve sockopts */
cb->s_flags2 = ocb->s_flags2; /* preserve sockopts */
cb->s_state = TCPS_LISTEN;
}
/*
* Packet received on connection.
* reset idle time and keep-alive timer;
*/
cb->s_idle = 0;
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
switch (cb->s_state) {
case TCPS_LISTEN:{
struct mbuf *am;
register struct sockaddr_ipx *sipx;
struct ipx_addr laddr;
/*
* If somebody here was carying on a conversation
* and went away, and his pen pal thinks he can
* still talk, we get the misdirected packet.
*/
if (spx_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
spx_istat.gonawy++;
goto dropwithreset;
}
am = m_get(M_DONTWAIT, MT_SONAME);
if (am == NULL)
goto drop;
am->m_len = sizeof (struct sockaddr_ipx);
sipx = mtod(am, struct sockaddr_ipx *);
sipx->sipx_len = sizeof(*sipx);
sipx->sipx_family = AF_IPX;
sipx->sipx_addr = si->si_sna;
laddr = ipxp->ipxp_laddr;
if (ipx_nullhost(laddr))
ipxp->ipxp_laddr = si->si_dna;
if (ipx_pcbconnect(ipxp, am)) {
ipxp->ipxp_laddr = laddr;
(void) m_free(am);
spx_istat.noconn++;
goto drop;
}
(void) m_free(am);
spx_template(cb);
dropsocket = 0; /* committed to socket */
cb->s_did = si->si_sid;
cb->s_rack = si->si_ack;
cb->s_ralo = si->si_alo;
#define THREEWAYSHAKE
#ifdef THREEWAYSHAKE
cb->s_state = TCPS_SYN_RECEIVED;
cb->s_force = 1 + SPXT_KEEP;
spxstat.spxs_accepts++;
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
}
break;
/*
* This state means that we have heard a response
* to our acceptance of their connection
* It is probably logically unnecessary in this
* implementation.
*/
case TCPS_SYN_RECEIVED: {
if (si->si_did!=cb->s_sid) {
spx_istat.wrncon++;
goto drop;
}
#endif
ipxp->ipxp_fport = si->si_sport;
cb->s_timer[SPXT_REXMT] = 0;
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
soisconnected(so);
cb->s_state = TCPS_ESTABLISHED;
spxstat.spxs_accepts++;
}
break;
/*
* This state means that we have gotten a response
* to our attempt to establish a connection.
* We fill in the data from the other side,
* telling us which port to respond to, instead of the well-
* known one we might have sent to in the first place.
* We also require that this is a response to our
* connection id.
*/
case TCPS_SYN_SENT:
if (si->si_did!=cb->s_sid) {
spx_istat.notme++;
goto drop;
}
spxstat.spxs_connects++;
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)) {
(void) m_freem(m);
}
if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT)))
(void) spx_output(cb, (struct mbuf *)0);
cb->s_flags &= ~(SF_WIN|SF_RXT);
return;
dropwithreset:
if (dropsocket)
(void) soabort(so);
si->si_seq = ntohs(si->si_seq);
si->si_ack = ntohs(si->si_ack);
si->si_alo = ntohs(si->si_alo);
ipx_error(dtom(si), IPX_ERR_NOSOCK, 0);
if (cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG || traceallspxs)
spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
return;
drop:
bad:
if (cb == 0 || cb->s_ipxpcb->ipxp_socket->so_options & SO_DEBUG ||
traceallspxs)
spx_trace(SA_DROP, (u_char)ostate, cb, &spx_savesi, 0);
m_freem(m);
}
int spxrexmtthresh = 3;
/*
* This is structurally similar to the tcp reassembly routine
* but its function is somewhat different: It merely queues
* packets up, and suppresses duplicates.
*/
int
spx_reass(cb, si)
register struct spxpcb *cb;
register struct spx *si;
{
register struct spx_q *q;
register struct mbuf *m;
register struct socket *so = cb->s_ipxpcb->ipxp_socket;
char packetp = cb->s_flags & SF_HI;
int incr;
char wakeup = 0;
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;
(void) spx_output(cb, (struct mbuf *)0);
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) {
register 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.
*/
while ((m = so->so_snd.sb_mb) != NULL) {
if (SSEQ_LT((mtod(m, struct spx *))->si_seq, si->si_ack))
sbdroprecord(&so->so_snd);
else
break;
}
sowwakeup(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)) {
ipx_error(dtom(si), IPX_ERR_FULLUP, 0);
return (0);
} /* else queue this packet; */
} else {
/*register struct socket *so = cb->s_ipxpcb->ipxp_socket;
if (so->so_state && SS_NOFDREF) {
ipx_error(dtom(si), IPX_ERR_NOSOCK, 0);
(void)spx_close(cb);
} else
would crash system*/
spx_istat.notyet++;
ipx_error(dtom(si), IPX_ERR_FULLUP, 0);
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)
/*
* 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_state |= SS_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(&so->so_rcv, mm);
}
}
if (sp->spx_cc & SPX_OB) {
MCHTYPE(m, MT_OOBDATA);
spx_newchecks[1]++;
so->so_oobmark = 0;
so->so_state &= ~SS_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(&so->so_rcv, m);
spx_newchecks[9]++;
} else
sbappend(&so->so_rcv, m);
} else
#endif
if (packetp) {
sbappendrecord(&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(&so->so_rcv, m);
}
} else
break;
}
if (wakeup) sorwakeup(so);
return (0);
}
void
spx_ctlinput(cmd, arg_as_sa, dummy)
int cmd;
struct sockaddr *arg_as_sa; /* XXX should be swapped with dummy */
void *dummy;
{
caddr_t arg = (/* XXX */ caddr_t)arg_as_sa;
struct ipx_addr *na;
struct ipx_errp *errp = (struct ipx_errp *)arg;
struct ipxpcb *ipxp;
struct sockaddr_ipx *sipx;
int type;
if (cmd < 0 || cmd > PRC_NCMDS)
return;
type = IPX_ERR_UNREACH_HOST;
switch (cmd) {
case PRC_ROUTEDEAD:
return;
case PRC_IFDOWN:
case PRC_HOSTDEAD:
case PRC_HOSTUNREACH:
sipx = (struct sockaddr_ipx *)arg;
if (sipx->sipx_family != AF_IPX)
return;
na = &sipx->sipx_addr;
break;
default:
errp = (struct ipx_errp *)arg;
na = &errp->ipx_err_ipx.ipx_dna;
type = errp->ipx_err_num;
type = ntohs((u_short)type);
break;
}
switch (type) {
case IPX_ERR_UNREACH_HOST:
ipx_pcbnotify(na, (int)ipxctlerrmap[cmd], spx_abort, (long)0);
break;
case IPX_ERR_TOO_BIG:
case IPX_ERR_NOSOCK:
ipxp = ipx_pcblookup(na, errp->ipx_err_ipx.ipx_sna.x_port,
IPX_WILDCARD);
if (ipxp) {
if(ipxp->ipxp_pcb)
(void) spx_drop((struct spxpcb *)ipxp->ipxp_pcb,
(int)ipxctlerrmap[cmd]);
else
(void) ipx_drop(ipxp, (int)ipxctlerrmap[cmd]);
}
break;
case IPX_ERR_FULLUP:
ipx_pcbnotify(na, 0, spx_quench, (long)0);
break;
}
}
/*
* When a source quench is received, close congestion window
* to one packet. We will gradually open it again as we proceed.
*/
void
spx_quench(ipxp)
struct ipxpcb *ipxp;
{
struct spxpcb *cb = ipxtospxpcb(ipxp);
if (cb)
cb->s_cwnd = CUNIT;
}
#ifdef notdef
int
spx_fixmtu(ipxp)
register struct ipxpcb *ipxp;
{
register struct spxpcb *cb = (struct spxpcb *)(ipxp->ipxp_pcb);
register struct mbuf *m;
register struct spx *si;
struct ipx_errp *ep;
struct sockbuf *sb;
int badseq, len;
struct mbuf *firstbad, *m0;
if (cb) {
/*
* The notification that we have sent
* too much is bad news -- we will
* have to go through queued up so far
* splitting ones which are too big and
* reassigning sequence numbers and checksums.
* we should then retransmit all packets from
* one above the offending packet to the last one
* we had sent (or our allocation)
* then the offending one so that the any queued
* data at our destination will be discarded.
*/
ep = (struct ipx_errp *)ipxp->ipxp_notify_param;
sb = &ipxp->ipxp_socket->so_snd;
cb->s_mtu = ep->ipx_err_param;
badseq = SI(&ep->ipx_err_ipx)->si_seq;
for (m = sb->sb_mb; m; m = m->m_act) {
si = mtod(m, struct spx *);
if (si->si_seq == badseq)
break;
}
if (m == 0) return;
firstbad = m;
/*for (;;) {*/
/* calculate length */
for (m0 = m, len = 0; m ; m = m->m_next)
len += m->m_len;
if (len > cb->s_mtu) {
}
/* FINISH THIS
} */
}
}
#endif
int
spx_output(cb, m0)
register struct spxpcb *cb;
struct mbuf *m0;
{
struct socket *so = cb->s_ipxpcb->ipxp_socket;
register struct mbuf *m;
register struct spx *si = (struct spx *) 0;
register 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;
if (m0) {
int mtu = cb->s_mtu;
int datalen;
/*
* Make sure that packet isn't too big.
*/
for (m = m0; m ; 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) {
/*
* Here we are only being called
* from usrreq(), so it is OK to
* block.
*/
m = m_copym(m0, 0, mtu, M_WAIT);
if (cb->s_flags & SF_NEWCALL) {
struct mbuf *mm = m;
spx_newchecks[7]++;
while (mm) {
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 == 0) {
m_freem(m0);
return (ENOBUFS);
}
m1->m_len = 1;
*(mtod(m1, u_char *)) = 0;
m->m_next = m1;
}
}
m = m_gethdr(M_DONTWAIT, MT_HEADER);
if (m == 0) {
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)) {
register struct spxhdr *sh;
if (m0->m_len < sizeof (*sh)) {
if((m0 = m_pullup(m0, sizeof(*sh))) == NULL) {
(void) 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; m = m->m_act) {
si = mtod(m, struct spx *);
if (SSEQ_LEQ(cb->s_snxt, si->si_seq))
break;
}
found:
if (si) {
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) {
/*
* 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_HEADER);
if (m == 0)
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 = 0;
len = ntohs(si->si_len);
if (len & 1)
len++;
si->si_sum = ipx_cksum(m, 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, (struct route *)0, 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);
}
int spx_do_persist_panics = 0;
void
spx_setpersist(cb)
register struct spxpcb *cb;
{
register t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
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++;
}
/*ARGSUSED*/
int
spx_ctloutput(req, so, level, name, value)
int req;
struct socket *so;
int level, name;
struct mbuf **value;
{
register struct mbuf *m;
struct ipxpcb *ipxp = sotoipxpcb(so);
register struct spxpcb *cb;
int mask, error = 0;
if (level != IPXPROTO_SPX) {
/* This will have to be changed when we do more general
stacking of protocols */
return (ipx_ctloutput(req, so, level, name, value));
}
if (ipxp == NULL) {
error = EINVAL;
goto release;
} else
cb = ipxtospxpcb(ipxp);
switch (req) {
case PRCO_GETOPT:
if (value == NULL)
return (EINVAL);
m = m_get(M_DONTWAIT, MT_DATA);
if (m == NULL)
return (ENOBUFS);
switch (name) {
case SO_HEADERS_ON_INPUT:
mask = SF_HI;
goto get_flags;
case SO_HEADERS_ON_OUTPUT:
mask = SF_HO;
get_flags:
m->m_len = sizeof(short);
*mtod(m, short *) = cb->s_flags & mask;
break;
case SO_MTU:
m->m_len = sizeof(u_short);
*mtod(m, short *) = cb->s_mtu;
break;
case SO_LAST_HEADER:
m->m_len = sizeof(struct spxhdr);
*mtod(m, struct spxhdr *) = cb->s_rhdr;
break;
case SO_DEFAULT_HEADERS:
m->m_len = sizeof(struct spx);
*mtod(m, struct spxhdr *) = cb->s_shdr;
break;
default:
error = EINVAL;
}
*value = m;
break;
case PRCO_SETOPT:
if (value == 0 || *value == 0) {
error = EINVAL;
break;
}
switch (name) {
int *ok;
case SO_HEADERS_ON_INPUT:
mask = SF_HI;
goto set_head;
case SO_HEADERS_ON_OUTPUT:
mask = SF_HO;
set_head:
if (cb->s_flags & SF_PI) {
ok = mtod(*value, int *);
if (*ok)
cb->s_flags |= mask;
else
cb->s_flags &= ~mask;
} else error = EINVAL;
break;
case SO_MTU:
cb->s_mtu = *(mtod(*value, u_short *));
break;
#ifdef SF_NEWCALL
case SO_NEWCALL:
ok = mtod(*value, int *);
if (*ok) {
cb->s_flags2 |= SF_NEWCALL;
spx_newchecks[5]++;
} else {
cb->s_flags2 &= ~SF_NEWCALL;
spx_newchecks[6]++;
}
break;
#endif
case SO_DEFAULT_HEADERS:
{
register struct spxhdr *sp
= mtod(*value, struct spxhdr *);
cb->s_dt = sp->spx_dt;
cb->s_cc = sp->spx_cc & SPX_EM;
}
break;
default:
error = EINVAL;
}
m_freem(*value);
break;
}
release:
return (error);
}
/*ARGSUSED*/
int
spx_usrreq(so, req, m, nam, controlp)
struct socket *so;
int req;
struct mbuf *m, *nam, *controlp;
{
struct ipxpcb *ipxp = sotoipxpcb(so);
register struct spxpcb *cb = NULL;
int s = splnet();
int error = 0, ostate;
struct mbuf *mm;
register struct sockbuf *sb;
if (req == PRU_CONTROL)
return (ipx_control(so, (int)m, (caddr_t)nam,
(struct ifnet *)controlp));
if (ipxp == NULL) {
if (req != PRU_ATTACH) {
error = EINVAL;
goto release;
}
} else
cb = ipxtospxpcb(ipxp);
ostate = cb ? cb->s_state : 0;
switch (req) {
case PRU_ATTACH:
if (ipxp != NULL) {
error = EISCONN;
break;
}
error = ipx_pcballoc(so, &ipxpcb);
if (error)
break;
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
error = soreserve(so, (u_long) 3072, (u_long) 3072);
if (error)
break;
}
ipxp = sotoipxpcb(so);
mm = m_getclr(M_DONTWAIT, MT_PCB);
sb = &so->so_snd;
if (mm == NULL) {
error = ENOBUFS;
break;
}
cb = mtod(mm, struct spxpcb *);
mm = m_getclr(M_DONTWAIT, MT_HEADER);
if (mm == NULL) {
(void) m_free(dtom(m));
error = ENOBUFS;
break;
}
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);
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;
break;
case PRU_DETACH:
if (ipxp == NULL) {
error = ENOTCONN;
break;
}
if (cb->s_state > TCPS_LISTEN)
cb = spx_disconnect(cb);
else
cb = spx_close(cb);
break;
case PRU_BIND:
error = ipx_pcbbind(ipxp, nam);
break;
case PRU_LISTEN:
if (ipxp->ipxp_lport == 0)
error = ipx_pcbbind(ipxp, (struct mbuf *)0);
if (error == 0)
cb->s_state = TCPS_LISTEN;
break;
/*
* 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.
*/
case PRU_CONNECT:
if (ipxp->ipxp_lport == 0) {
error = ipx_pcbbind(ipxp, (struct mbuf *)0);
if (error)
break;
}
error = ipx_pcbconnect(ipxp, nam);
if (error)
break;
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, (struct mbuf *) 0);
break;
case PRU_CONNECT2:
error = EOPNOTSUPP;
break;
/*
* We may decide later to implement connection closing
* handshaking at the spx level optionally.
* here is the hook to do it:
*/
case PRU_DISCONNECT:
cb = spx_disconnect(cb);
break;
/*
* Accept a connection. Essentially all the work is
* done at higher levels; just return the address
* of the peer, storing through addr.
*/
case PRU_ACCEPT: {
struct sockaddr_ipx *sipx = mtod(nam, struct sockaddr_ipx *);
nam->m_len = sizeof (struct sockaddr_ipx);
sipx->sipx_family = AF_IPX;
sipx->sipx_addr = ipxp->ipxp_faddr;
break;
}
case PRU_SHUTDOWN:
socantsendmore(so);
cb = spx_usrclosed(cb);
if (cb)
error = spx_output(cb, (struct mbuf *) 0);
break;
/*
* After a receive, possibly send acknowledgment
* updating allocation.
*/
case PRU_RCVD:
cb->s_flags |= SF_RVD;
(void) spx_output(cb, (struct mbuf *) 0);
cb->s_flags &= ~SF_RVD;
break;
case PRU_ABORT:
(void) spx_drop(cb, ECONNABORTED);
break;
case PRU_SENSE:
case PRU_CONTROL:
m = NULL;
error = EOPNOTSUPP;
break;
case PRU_RCVOOB:
if ((cb->s_oobflags & SF_IOOB) || so->so_oobmark ||
(so->so_state & SS_RCVATMARK)) {
m->m_len = 1;
*mtod(m, caddr_t) = cb->s_iobc;
break;
}
error = EINVAL;
break;
case PRU_SENDOOB:
if (sbspace(&so->so_snd) < -512) {
error = ENOBUFS;
break;
}
cb->s_oobflags |= SF_SOOB;
/* fall into */
case PRU_SEND:
if (controlp) {
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;
break;
case PRU_SOCKADDR:
ipx_setsockaddr(ipxp, nam);
break;
case PRU_PEERADDR:
ipx_setpeeraddr(ipxp, nam);
break;
case PRU_SLOWTIMO:
cb = spx_timers(cb, (int)nam);
req |= ((int)nam) << 8;
break;
case PRU_FASTTIMO:
case PRU_PROTORCV:
case PRU_PROTOSEND:
error = EOPNOTSUPP;
break;
default:
panic("spx_usrreq");
}
if (cb && (so->so_options & SO_DEBUG || traceallspxs))
spx_trace(SA_USER, (u_char)ostate, cb, (struct spx *)0, req);
release:
if (controlp != NULL)
m_freem(controlp);
if (m != NULL)
m_freem(m);
splx(s);
return (error);
}
int
spx_usrreq_sp(so, req, m, nam, controlp)
struct socket *so;
int req;
struct mbuf *m, *nam, *controlp;
{
int error = spx_usrreq(so, req, m, nam, controlp);
if (req == PRU_ATTACH && error == 0) {
struct ipxpcb *ipxp = sotoipxpcb(so);
((struct spxpcb *)ipxp->ipxp_pcb)->s_flags |=
(SF_HI | SF_HO | SF_PI);
}
return (error);
}
/*
* 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.
*/
void
spx_template(cb)
register struct spxpcb *cb;
{
register struct ipxpcb *ipxp = cb->s_ipxpcb;
register struct ipx *ipx = cb->s_ipx;
register struct sockbuf *sb = &(ipxp->ipxp_socket->so_snd);
ipx->ipx_pt = IPXPROTO_SPX;
ipx->ipx_sna = ipxp->ipxp_laddr;
ipx->ipx_dna = ipxp->ipxp_faddr;
cb->s_sid = htons(spx_iss);
spx_iss += SPX_ISSINCR/2;
cb->s_alo = 1;
cb->s_cwnd = (sbspace(sb) * CUNIT) / cb->s_mtu;
cb->s_ssthresh = cb->s_cwnd; /* Try to expand fast to full complement
of large packets */
cb->s_cwmx = (sbspace(sb) * CUNIT) / (2 * sizeof(struct spx));
cb->s_cwmx = max(cb->s_cwmx, cb->s_cwnd);
/* But allow for lots of little packets as well */
}
/*
* Close a SPIP control block:
* discard spx control block itself
* discard ipx protocol control block
* wake up any sleepers
*/
struct spxpcb *
spx_close(cb)
register struct spxpcb *cb;
{
register struct spx_q *s;
struct ipxpcb *ipxp = cb->s_ipxpcb;
struct socket *so = ipxp->ipxp_socket;
register struct mbuf *m;
s = cb->s_q.si_next;
while (s != &(cb->s_q)) {
s = s->si_next;
m = dtom(s->si_prev);
remque(s->si_prev);
m_freem(m);
}
(void) m_free(dtom(cb->s_ipx));
(void) m_free(dtom(cb));
ipxp->ipxp_pcb = 0;
soisdisconnected(so);
ipx_pcbdetach(ipxp);
spxstat.spxs_closed++;
return ((struct spxpcb *)0);
}
/*
* Someday we may do level 3 handshaking
* to close a connection or send a xerox style error.
* For now, just close.
*/
struct spxpcb *
spx_usrclosed(cb)
register struct spxpcb *cb;
{
return (spx_close(cb));
}
struct spxpcb *
spx_disconnect(cb)
register struct spxpcb *cb;
{
return (spx_close(cb));
}
/*
* Drop connection, reporting
* the specified error.
*/
struct spxpcb *
spx_drop(cb, errno)
register struct spxpcb *cb;
int errno;
{
struct socket *so = cb->s_ipxpcb->ipxp_socket;
/*
* 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;
/*(void) tcp_output(cb);*/
} else
spxstat.spxs_conndrops++;
so->so_error = errno;
return (spx_close(cb));
}
void
spx_abort(ipxp)
struct ipxpcb *ipxp;
{
(void) spx_close((struct spxpcb *)ipxp->ipxp_pcb);
}
int spx_backoff[SPX_MAXRXTSHIFT+1] =
{ 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
/*
* Fast timeout routine for processing delayed acks
*/
void
spx_fasttimo()
{
register struct ipxpcb *ipxp;
register struct spxpcb *cb;
int s = splnet();
ipxp = ipxpcb.ipxp_next;
if (ipxp)
for (; ipxp != &ipxpcb; ipxp = ipxp->ipxp_next)
if ((cb = (struct spxpcb *)ipxp->ipxp_pcb) &&
(cb->s_flags & SF_DELACK)) {
cb->s_flags &= ~SF_DELACK;
cb->s_flags |= SF_ACKNOW;
spxstat.spxs_delack++;
(void) spx_output(cb, (struct mbuf *) 0);
}
splx(s);
}
/*
* 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()
{
register struct ipxpcb *ip, *ipnxt;
register struct spxpcb *cb;
int s = splnet();
register int i;
/*
* Search through tcb's and update active timers.
*/
ip = ipxpcb.ipxp_next;
if (ip == 0) {
splx(s);
return;
}
while (ip != &ipxpcb) {
cb = ipxtospxpcb(ip);
ipnxt = ip->ipxp_next;
if (cb == 0)
goto tpgone;
for (i = 0; i < SPXT_NTIMERS; i++) {
if (cb->s_timer[i] && --cb->s_timer[i] == 0) {
(void) spx_usrreq(cb->s_ipxpcb->ipxp_socket,
PRU_SLOWTIMO, (struct mbuf *)0,
(struct mbuf *)i, (struct mbuf *)0);
if (ipnxt->ipxp_prev != ip)
goto tpgone;
}
}
cb->s_idle++;
if (cb->s_rtt)
cb->s_rtt++;
tpgone:
ip = ipnxt;
}
spx_iss += SPX_ISSINCR/PR_SLOWHZ; /* increment iss */
splx(s);
}
/*
* SPX timer processing.
*/
struct spxpcb *
spx_timers(cb, timer)
register struct spxpcb *cb;
int timer;
{
long rexmt;
int win;
cb->s_force = 1 + timer;
switch (timer) {
/*
* 2 MSL timeout in shutdown went off. TCP deletes connection
* control block.
*/
case SPXT_2MSL:
printf("spx: SPXT_2MSL went off for no reason\n");
cb->s_timer[timer] = 0;
break;
/*
* Retransmission timer went off. Message has not
* been acked within retransmit interval. Back off
* to a longer retransmit interval and retransmit one packet.
*/
case SPXT_REXMT:
if (++cb->s_rxtshift > SPX_MAXRXTSHIFT) {
cb->s_rxtshift = SPX_MAXRXTSHIFT;
spxstat.spxs_timeoutdrop++;
cb = 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;
(void) spx_output(cb, (struct mbuf *) 0);
break;
/*
* Persistance timer into zero window.
* Force a probe to be sent.
*/
case SPXT_PERSIST:
spxstat.spxs_persisttimeo++;
spx_setpersist(cb);
(void) spx_output(cb, (struct mbuf *) 0);
break;
/*
* Keep-alive timer went off; send something
* or drop connection if idle for too long.
*/
case SPXT_KEEP:
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++;
(void) spx_output(cb, (struct mbuf *) 0);
} else
cb->s_idle = 0;
cb->s_timer[SPXT_KEEP] = SPXTV_KEEP;
break;
dropit:
spxstat.spxs_keepdrops++;
cb = spx_drop(cb, ETIMEDOUT);
break;
}
return (cb);
}
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