+++ /dev/null
-/*
- * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License"). You may not use this file except in compliance with the
- * License. Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
- *
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT. Please see the
- * License for the specific language governing rights and limitations
- * under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-/*
- * 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.
- *
- * @(#)spp_usrreq.c 8.1 (Berkeley) 6/10/93
- */
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/malloc.h>
-#include <sys/mbuf.h>
-#include <sys/protosw.h>
-#include <sys/socket.h>
-#include <sys/socketvar.h>
-#include <sys/errno.h>
-#include <sys/ev.h>
-
-#include <net/if.h>
-#include <net/route.h>
-#include <netinet/tcp_fsm.h>
-
-#include <netns/ns.h>
-#include <netns/ns_pcb.h>
-#include <netns/idp.h>
-#include <netns/idp_var.h>
-#include <netns/ns_error.h>
-#include <netns/sp.h>
-#include <netns/spidp.h>
-#include <netns/spp_timer.h>
-#include <netns/spp_var.h>
-#include <netns/spp_debug.h>
-
-/*
- * SP protocol implementation.
- */
-spp_init()
-{
-
- spp_iss = 1; /* WRONG !! should fish it out of TODR */
-}
-struct spidp spp_savesi;
-int traceallspps = 0;
-extern int sppconsdebug;
-int spp_hardnosed;
-int spp_use_delack = 0;
-u_short spp_newchecks[50];
-
-/*ARGSUSED*/
-spp_input(m, nsp)
- register struct mbuf *m;
- register struct nspcb *nsp;
-{
- register struct sppcb *cb;
- register struct spidp *si = mtod(m, struct spidp *);
- register struct socket *so;
- short ostate;
- int dropsocket = 0;
-
-
- sppstat.spps_rcvtotal++;
- if (nsp == 0) {
- panic("No nspcb in spp_input\n");
- return;
- }
-
- cb = nstosppcb(nsp);
- if (cb == 0) goto bad;
-
- if (m->m_len < sizeof(*si)) {
- if ((m = m_pullup(m, sizeof(*si))) == 0) {
- sppstat.spps_rcvshort++;
- return;
- }
- si = mtod(m, struct spidp *);
- }
- si->si_seq = ntohs(si->si_seq);
- si->si_ack = ntohs(si->si_ack);
- si->si_alo = ntohs(si->si_alo);
-
- so = nsp->nsp_socket;
- if (so->so_options & SO_DEBUG || traceallspps) {
- ostate = cb->s_state;
- spp_savesi = *si;
- }
- if (so->so_options & SO_ACCEPTCONN) {
- struct sppcb *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++;
- nsp = (struct nspcb *)so->so_pcb;
- nsp->nsp_laddr = si->si_dna;
- cb = nstosppcb(nsp);
- 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[SPPT_KEEP] = SPPTV_KEEP;
-
- switch (cb->s_state) {
-
- case TCPS_LISTEN:{
- struct mbuf *am;
- register struct sockaddr_ns *sns;
- struct ns_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 (spp_hardnosed && (si->si_did != 0 || si->si_seq != 0)) {
- spp_istat.gonawy++;
- goto dropwithreset;
- }
- am = m_get(M_DONTWAIT, MT_SONAME);
- if (am == NULL)
- goto drop;
- am->m_len = sizeof (struct sockaddr_ns);
- sns = mtod(am, struct sockaddr_ns *);
- sns->sns_len = sizeof(*sns);
- sns->sns_family = AF_NS;
- sns->sns_addr = si->si_sna;
- laddr = nsp->nsp_laddr;
- if (ns_nullhost(laddr))
- nsp->nsp_laddr = si->si_dna;
- if (ns_pcbconnect(nsp, am)) {
- nsp->nsp_laddr = laddr;
- (void) m_free(am);
- spp_istat.noconn++;
- goto drop;
- }
- (void) m_free(am);
- spp_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 + SPPT_KEEP;
- sppstat.spps_accepts++;
- cb->s_timer[SPPT_KEEP] = SPPTV_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) {
- spp_istat.wrncon++;
- goto drop;
- }
-#endif
- nsp->nsp_fport = si->si_sport;
- cb->s_timer[SPPT_REXMT] = 0;
- cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
- soisconnected(so);
- cb->s_state = TCPS_ESTABLISHED;
- sppstat.spps_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) {
- spp_istat.notme++;
- goto drop;
- }
- sppstat.spps_connects++;
- cb->s_did = si->si_sid;
- cb->s_rack = si->si_ack;
- cb->s_ralo = si->si_alo;
- cb->s_dport = nsp->nsp_fport = si->si_sport;
- cb->s_timer[SPPT_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;
- SPPT_RANGESET(cb->s_rxtcur,
- ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
- SPPTV_MIN, SPPTV_REXMTMAX);
- cb->s_rtt = 0;
- }
- }
- if (so->so_options & SO_DEBUG || traceallspps)
- spp_trace(SA_INPUT, (u_char)ostate, cb, &spp_savesi, 0);
-
- m->m_len -= sizeof (struct idp);
- m->m_pkthdr.len -= sizeof (struct idp);
- m->m_data += sizeof (struct idp);
-
- if (spp_reass(cb, si)) {
- (void) m_freem(m);
- }
- if (cb->s_force || (cb->s_flags & (SF_ACKNOW|SF_WIN|SF_RXT)))
- (void) spp_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);
- ns_error(dtom(si), NS_ERR_NOSOCK, 0);
- if (cb->s_nspcb->nsp_socket->so_options & SO_DEBUG || traceallspps)
- spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0);
- return;
-
-drop:
-bad:
- if (cb == 0 || cb->s_nspcb->nsp_socket->so_options & SO_DEBUG ||
- traceallspps)
- spp_trace(SA_DROP, (u_char)ostate, cb, &spp_savesi, 0);
- m_freem(m);
-}
-
-int spprexmtthresh = 3;
-
-/*
- * This is structurally similar to the tcp reassembly routine
- * but its function is somewhat different: It merely queues
- * packets up, and suppresses duplicates.
- */
-spp_reass(cb, si)
-register struct sppcb *cb;
-register struct spidp *si;
-{
- register struct spidp_q *q;
- register struct mbuf *m;
- register struct socket *so = cb->s_nspcb->nsp_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 & SP_SA)
- cb->s_flags |= (spp_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 & SP_SP) && cb->s_rack != (cb->s_smax + 1)) {
- sppstat.spps_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 == spprexmtthresh) {
- 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 + SPPT_REXMT;
- (void) spp_output(cb, (struct mbuf *)0);
- cb->s_timer[SPPT_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))) {
- sppstat.spps_rcvacktoomuch++;
- si->si_ack = cb->s_smax + 1;
- }
- sppstat.spps_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)) {
- sppstat.spps_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;
- SPPT_RANGESET(cb->s_rxtcur,
- ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1,
- SPPTV_MIN, SPPTV_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[SPPT_REXMT] = 0;
- cb->s_flags |= SF_RXT;
- } else if (cb->s_timer[SPPT_PERSIST] == 0)
- cb->s_timer[SPPT_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 spidp *))->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 & SP_SP) && cb->s_swl2 == si->si_ack
- && SSEQ_LT(cb->s_ralo, si->si_alo)) {
- sppstat.spps_rcvwinupd++;
- sppstat.spps_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 & SP_SP) {
- sppstat.spps_rcvwinprobe++;
- return (1);
- } else
- sppstat.spps_rcvpackafterwin++;
- if (si->si_cc & SP_OB) {
- if (SSEQ_GT(si->si_seq, cb->s_alo + 60)) {
- ns_error(dtom(si), NS_ERR_FULLUP, 0);
- return (0);
- } /* else queue this packet; */
- } else {
- /*register struct socket *so = cb->s_nspcb->nsp_socket;
- if (so->so_state && SS_NOFDREF) {
- ns_error(dtom(si), NS_ERR_NOSOCK, 0);
- (void)spp_close(cb);
- } else
- would crash system*/
- spp_istat.notyet++;
- ns_error(dtom(si), NS_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 & SP_SP) {
- return (1);
- }
- /*
- * We have already seen this packet, so drop.
- */
- if (SSEQ_LT(si->si_seq, cb->s_ack)) {
- spp_istat.bdreas++;
- sppstat.spps_rcvduppack++;
- if (si->si_seq == cb->s_ack - 1)
- spp_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) {
- sppstat.spps_rcvduppack++;
- return (1);
- }
- if (SSEQ_LT(si->si_seq, SI(q)->si_seq)) {
- sppstat.spps_rcvoopack++;
- break;
- }
- }
- insque(si, q->si_prev);
- /*
- * If this packet is urgent, inform process
- */
- if (si->si_cc & SP_OB) {
- cb->s_iobc = ((char *)si)[1 + sizeof(*si)];
- sohasoutofband(so);
- cb->s_oobflags |= SF_IOOB;
- }
-present:
-#define SPINC sizeof(struct sphdr)
- /*
- * 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 & SP_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;
- postevent(so, 0, EV_OOB);
- }
- q = q->si_prev;
- remque(q->si_next);
- wakeup = 1;
- sppstat.spps_rcvpack++;
-#ifdef SF_NEWCALL
- if (cb->s_flags2 & SF_NEWCALL) {
- struct sphdr *sp = mtod(m, struct sphdr *);
- u_char dt = sp->sp_dt;
- spp_newchecks[4]++;
- if (dt != cb->s_rhdr.sp_dt) {
- struct mbuf *mm =
- m_getclr(M_DONTWAIT, MT_CONTROL);
- spp_newchecks[0]++;
- if (mm != NULL) {
- u_short *s =
- mtod(mm, u_short *);
- cb->s_rhdr.sp_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->sp_cc & SP_OB) {
- MCHTYPE(m, MT_OOBDATA);
- spp_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->sp_cc & SP_EM) || packetp) {
- sbappendrecord(&so->so_rcv, m);
- spp_newchecks[9]++;
- } else
- sbappend(&so->so_rcv, m);
- } else
-#endif
- if (packetp) {
- sbappendrecord(&so->so_rcv, m);
- } else {
- cb->s_rhdr = *mtod(m, struct sphdr *);
- 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);
-}
-
-spp_ctlinput(cmd, arg)
- int cmd;
- caddr_t arg;
-{
- struct ns_addr *na;
- extern u_char nsctlerrmap[];
- extern spp_abort(), spp_quench();
- extern struct nspcb *idp_drop();
- struct ns_errp *errp;
- struct nspcb *nsp;
- struct sockaddr_ns *sns;
- int type;
-
- if (cmd < 0 || cmd > PRC_NCMDS)
- return;
- type = NS_ERR_UNREACH_HOST;
-
- switch (cmd) {
-
- case PRC_ROUTEDEAD:
- return;
-
- case PRC_IFDOWN:
- case PRC_HOSTDEAD:
- case PRC_HOSTUNREACH:
- sns = (struct sockaddr_ns *)arg;
- if (sns->sns_family != AF_NS)
- return;
- na = &sns->sns_addr;
- break;
-
- default:
- errp = (struct ns_errp *)arg;
- na = &errp->ns_err_idp.idp_dna;
- type = errp->ns_err_num;
- type = ntohs((u_short)type);
- }
- switch (type) {
-
- case NS_ERR_UNREACH_HOST:
- ns_pcbnotify(na, (int)nsctlerrmap[cmd], spp_abort, (long) 0);
- break;
-
- case NS_ERR_TOO_BIG:
- case NS_ERR_NOSOCK:
- nsp = ns_pcblookup(na, errp->ns_err_idp.idp_sna.x_port,
- NS_WILDCARD);
- if (nsp) {
- if(nsp->nsp_pcb)
- (void) spp_drop((struct sppcb *)nsp->nsp_pcb,
- (int)nsctlerrmap[cmd]);
- else
- (void) idp_drop(nsp, (int)nsctlerrmap[cmd]);
- }
- break;
-
- case NS_ERR_FULLUP:
- ns_pcbnotify(na, 0, spp_quench, (long) 0);
- }
-}
-/*
- * When a source quench is received, close congestion window
- * to one packet. We will gradually open it again as we proceed.
- */
-spp_quench(nsp)
- struct nspcb *nsp;
-{
- struct sppcb *cb = nstosppcb(nsp);
-
- if (cb)
- cb->s_cwnd = CUNIT;
-}
-
-#ifdef notdef
-int
-spp_fixmtu(nsp)
-register struct nspcb *nsp;
-{
- register struct sppcb *cb = (struct sppcb *)(nsp->nsp_pcb);
- register struct mbuf *m;
- register struct spidp *si;
- struct ns_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 ns_errp *)nsp->nsp_notify_param;
- sb = &nsp->nsp_socket->so_snd;
- cb->s_mtu = ep->ns_err_param;
- badseq = SI(&ep->ns_err_idp)->si_seq;
- for (m = sb->sb_mb; m; m = m->m_act) {
- si = mtod(m, struct spidp *);
- 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
-
-spp_output(cb, m0)
- register struct sppcb *cb;
- struct mbuf *m0;
-{
- struct socket *so = cb->s_nspcb->nsp_socket;
- register struct mbuf *m;
- register struct spidp *si = (struct spidp *) 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;
- extern int idpcksum;
-
- 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 sphdr) : len;
- if (datalen > mtu) {
- if (cb->s_flags & SF_PI) {
- m_freem(m0);
- return (EMSGSIZE);
- } else {
- int oldEM = cb->s_cc & SP_EM;
-
- cb->s_cc &= ~SP_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;
- spp_newchecks[7]++;
- while (mm) {
- mm->m_flags &= ~M_EOR;
- mm = mm->m_next;
- }
- }
- error = spp_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 spidp));
- m->m_len = sizeof (struct spidp);
- m->m_next = m0;
- si = mtod(m, struct spidp *);
- si->si_i = *cb->s_idp;
- si->si_s = cb->s_shdr;
- if ((cb->s_flags & SF_PI) && (cb->s_flags & SF_HO)) {
- register struct sphdr *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 sphdr *);
- si->si_dt = sh->sp_dt;
- si->si_cc |= sh->sp_cc & SP_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 |= SP_EM;
- spp_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 |= SP_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 + SPPT_PERSIST) {
- if (win != 0) {
- cb->s_timer[SPPT_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[SPPT_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;
- sppstat.spps_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 spp.
- * 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)) {
- sppstat.spps_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[SPPT_REXMT] == 0 &&
- cb->s_timer[SPPT_PERSIST] == 0) {
- cb->s_rxtshift = 0;
- spp_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 spidp *);
- if (SSEQ_LEQ(cb->s_snxt, si->si_seq))
- break;
- }
- found:
- if (si) {
- if (si->si_seq == cb->s_snxt)
- cb->s_snxt++;
- else
- sppstat.spps_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
- * idp_output to monkey with
- */
- m = m_copy(dtom(si), 0, (int)M_COPYALL);
- if (m == NULL) {
- return (ENOBUFS);
- }
- si = mtod(m, struct spidp *);
- if (SSEQ_LT(si->si_seq, cb->s_smax))
- sppstat.spps_sndrexmitpack++;
- else
- sppstat.spps_sndpack++;
- } else if (cb->s_force || cb->s_flags & SF_ACKNOW) {
- /*
- * Must send an acknowledgement or a probe
- */
- if (cb->s_force)
- sppstat.spps_sndprobe++;
- if (cb->s_flags & SF_ACKNOW)
- sppstat.spps_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 spidp));
- m->m_len = sizeof (*si);
- m->m_pkthdr.len = sizeof (*si);
- si = mtod(m, struct spidp *);
- si->si_i = *cb->s_idp;
- si->si_s = cb->s_shdr;
- si->si_seq = cb->s_smax + 1;
- si->si_len = htons(sizeof (*si));
- si->si_cc |= SP_SP;
- } else {
- cb->s_outx = 3;
- if (so->so_options & SO_DEBUG || traceallspps)
- spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
- return (0);
- }
- /*
- * Stuff checksum and output datagram.
- */
- if ((si->si_cc & SP_SP) == 0) {
- if (cb->s_force != (1 + SPPT_PERSIST) ||
- cb->s_timer[SPPT_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) {
- sppstat.spps_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[SPPT_REXMT] == 0 &&
- cb->s_snxt != cb->s_rack) {
- cb->s_timer[SPPT_REXMT] = cb->s_rxtcur;
- if (cb->s_timer[SPPT_PERSIST]) {
- cb->s_timer[SPPT_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[SPPT_REXMT] == 0)
- cb->s_timer[SPPT_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 & SP_SP) == 0) || cb->s_force)
- si->si_cc |= SP_SA;
- si->si_seq = htons(si->si_seq);
- si->si_alo = htons(alo);
- si->si_ack = htons(cb->s_ack);
-
- if (idpcksum) {
- si->si_sum = 0;
- len = ntohs(si->si_len);
- if (len & 1)
- len++;
- si->si_sum = ns_cksum(m, len);
- } else
- si->si_sum = 0xffff;
-
- cb->s_outx = 4;
- if (so->so_options & SO_DEBUG || traceallspps)
- spp_trace(SA_OUTPUT, cb->s_state, cb, si, 0);
-
- if (so->so_options & SO_DONTROUTE)
- error = ns_output(m, (struct route *)0, NS_ROUTETOIF);
- else
- error = ns_output(m, &cb->s_nspcb->nsp_route, 0);
- }
- if (error) {
- return (error);
- }
- sppstat.spps_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 spp_do_persist_panics = 0;
-
-spp_setpersist(cb)
- register struct sppcb *cb;
-{
- register t = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
- extern int spp_backoff[];
-
- if (cb->s_timer[SPPT_REXMT] && spp_do_persist_panics)
- panic("spp_output REXMT");
- /*
- * Start/restart persistance timer.
- */
- SPPT_RANGESET(cb->s_timer[SPPT_PERSIST],
- t*spp_backoff[cb->s_rxtshift],
- SPPTV_PERSMIN, SPPTV_PERSMAX);
- if (cb->s_rxtshift < SPP_MAXRXTSHIFT)
- cb->s_rxtshift++;
-}
-/*ARGSUSED*/
-spp_ctloutput(req, so, level, name, value)
- int req;
- struct socket *so;
- int name;
- struct mbuf **value;
-{
- register struct mbuf *m;
- struct nspcb *nsp = sotonspcb(so);
- register struct sppcb *cb;
- int mask, error = 0;
-
- if (level != NSPROTO_SPP) {
- /* This will have to be changed when we do more general
- stacking of protocols */
- return (idp_ctloutput(req, so, level, name, value));
- }
- if (nsp == NULL) {
- error = EINVAL;
- goto release;
- } else
- cb = nstosppcb(nsp);
-
- 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 sphdr);
- *mtod(m, struct sphdr *) = cb->s_rhdr;
- break;
-
- case SO_DEFAULT_HEADERS:
- m->m_len = sizeof(struct spidp);
- *mtod(m, struct sphdr *) = 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;
- spp_newchecks[5]++;
- } else {
- cb->s_flags2 &= ~SF_NEWCALL;
- spp_newchecks[6]++;
- }
- break;
-#endif
-
- case SO_DEFAULT_HEADERS:
- {
- register struct sphdr *sp
- = mtod(*value, struct sphdr *);
- cb->s_dt = sp->sp_dt;
- cb->s_cc = sp->sp_cc & SP_EM;
- }
- break;
-
- default:
- error = EINVAL;
- }
- m_freem(*value);
- break;
- }
- release:
- return (error);
-}
-
-/*ARGSUSED*/
-spp_usrreq(so, req, m, nam, controlp)
- struct socket *so;
- int req;
- struct mbuf *m, *nam, *controlp;
-{
- struct nspcb *nsp = sotonspcb(so);
- register struct sppcb *cb;
- int s = splnet();
- int error = 0, ostate;
- struct mbuf *mm;
- register struct sockbuf *sb;
-
- if (req == PRU_CONTROL)
- return (ns_control(so, (int)m, (caddr_t)nam,
- (struct ifnet *)controlp));
- if (nsp == NULL) {
- if (req != PRU_ATTACH) {
- error = EINVAL;
- goto release;
- }
- } else
- cb = nstosppcb(nsp);
-
- ostate = cb ? cb->s_state : 0;
-
- switch (req) {
-
- case PRU_ATTACH:
- if (nsp != NULL) {
- error = EISCONN;
- break;
- }
- error = ns_pcballoc(so, &nspcb);
- 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;
- }
- nsp = sotonspcb(so);
-
- mm = m_getclr(M_DONTWAIT, MT_PCB);
- sb = &so->so_snd;
-
- if (mm == NULL) {
- error = ENOBUFS;
- break;
- }
- cb = mtod(mm, struct sppcb *);
- mm = m_getclr(M_DONTWAIT, MT_HEADER);
- if (mm == NULL) {
- (void) m_free(dtom(m));
- error = ENOBUFS;
- break;
- }
- cb->s_idp = mtod(mm, struct idp *);
- 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_nspcb = nsp;
- cb->s_mtu = 576 - sizeof (struct spidp);
- cb->s_cwnd = sbspace(sb) * CUNIT / cb->s_mtu;
- cb->s_ssthresh = cb->s_cwnd;
- cb->s_cwmx = sbspace(sb) * CUNIT /
- (2 * sizeof (struct spidp));
- /* Above is recomputed when connecting to account
- for changed buffering or mtu's */
- cb->s_rtt = SPPTV_SRTTBASE;
- cb->s_rttvar = SPPTV_SRTTDFLT << 2;
- SPPT_RANGESET(cb->s_rxtcur,
- ((SPPTV_SRTTBASE >> 2) + (SPPTV_SRTTDFLT << 2)) >> 1,
- SPPTV_MIN, SPPTV_REXMTMAX);
- nsp->nsp_pcb = (caddr_t) cb;
- break;
-
- case PRU_DETACH:
- if (nsp == NULL) {
- error = ENOTCONN;
- break;
- }
- if (cb->s_state > TCPS_LISTEN)
- cb = spp_disconnect(cb);
- else
- cb = spp_close(cb);
- break;
-
- case PRU_BIND:
- error = ns_pcbbind(nsp, nam);
- break;
-
- case PRU_LISTEN:
- if (nsp->nsp_lport == 0)
- error = ns_pcbbind(nsp, (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 (nsp->nsp_lport == 0) {
- error = ns_pcbbind(nsp, (struct mbuf *)0);
- if (error)
- break;
- }
- error = ns_pcbconnect(nsp, nam);
- if (error)
- break;
- soisconnecting(so);
- sppstat.spps_connattempt++;
- cb->s_state = TCPS_SYN_SENT;
- cb->s_did = 0;
- spp_template(cb);
- cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
- cb->s_force = 1 + SPPTV_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.
- */
- nsp->nsp_fport = 0;
- error = spp_output(cb, (struct mbuf *) 0);
- break;
-
- case PRU_CONNECT2:
- error = EOPNOTSUPP;
- break;
-
- /*
- * We may decide later to implement connection closing
- * handshaking at the spp level optionally.
- * here is the hook to do it:
- */
- case PRU_DISCONNECT:
- cb = spp_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_ns *sns = mtod(nam, struct sockaddr_ns *);
-
- nam->m_len = sizeof (struct sockaddr_ns);
- sns->sns_family = AF_NS;
- sns->sns_addr = nsp->nsp_faddr;
- break;
- }
-
- case PRU_SHUTDOWN:
- socantsendmore(so);
- cb = spp_usrclosed(cb);
- if (cb)
- error = spp_output(cb, (struct mbuf *) 0);
- break;
-
- /*
- * After a receive, possibly send acknowledgment
- * updating allocation.
- */
- case PRU_RCVD:
- cb->s_flags |= SF_RVD;
- (void) spp_output(cb, (struct mbuf *) 0);
- cb->s_flags &= ~SF_RVD;
- break;
-
- case PRU_ABORT:
- (void) spp_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 *);
- spp_newchecks[2]++;
- if ((p[0] == 5) && p[1] == 1) { /* XXXX, for testing */
- cb->s_shdr.sp_dt = *(u_char *)(&p[2]);
- spp_newchecks[3]++;
- }
- m_freem(controlp);
- }
- controlp = NULL;
- error = spp_output(cb, m);
- m = NULL;
- break;
-
- case PRU_SOCKADDR:
- ns_setsockaddr(nsp, nam);
- break;
-
- case PRU_PEERADDR:
- ns_setpeeraddr(nsp, nam);
- break;
-
- case PRU_SLOWTIMO:
- cb = spp_timers(cb, (int)nam);
- req |= ((int)nam) << 8;
- break;
-
- case PRU_FASTTIMO:
- case PRU_PROTORCV:
- case PRU_PROTOSEND:
- error = EOPNOTSUPP;
- break;
-
- default:
- panic("sp_usrreq");
- }
- if (cb && (so->so_options & SO_DEBUG || traceallspps))
- spp_trace(SA_USER, (u_char)ostate, cb, (struct spidp *)0, req);
-release:
- if (controlp != NULL)
- m_freem(controlp);
- if (m != NULL)
- m_freem(m);
- splx(s);
- return (error);
-}
-
-spp_usrreq_sp(so, req, m, nam, controlp)
- struct socket *so;
- int req;
- struct mbuf *m, *nam, *controlp;
-{
- int error = spp_usrreq(so, req, m, nam, controlp);
-
- if (req == PRU_ATTACH && error == 0) {
- struct nspcb *nsp = sotonspcb(so);
- ((struct sppcb *)nsp->nsp_pcb)->s_flags |=
- (SF_HI | SF_HO | SF_PI);
- }
- return (error);
-}
-
-/*
- * Create template to be used to send spp packets on a connection.
- * Called after host entry created, fills
- * in a skeletal spp header (choosing connection id),
- * minimizing the amount of work necessary when the connection is used.
- */
-spp_template(cb)
- register struct sppcb *cb;
-{
- register struct nspcb *nsp = cb->s_nspcb;
- register struct idp *idp = cb->s_idp;
- register struct sockbuf *sb = &(nsp->nsp_socket->so_snd);
-
- idp->idp_pt = NSPROTO_SPP;
- idp->idp_sna = nsp->nsp_laddr;
- idp->idp_dna = nsp->nsp_faddr;
- cb->s_sid = htons(spp_iss);
- spp_iss += SPP_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 spidp));
- 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 spp control block itself
- * discard ns protocol control block
- * wake up any sleepers
- */
-struct sppcb *
-spp_close(cb)
- register struct sppcb *cb;
-{
- register struct spidp_q *s;
- struct nspcb *nsp = cb->s_nspcb;
- struct socket *so = nsp->nsp_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_idp));
- (void) m_free(dtom(cb));
- nsp->nsp_pcb = 0;
- soisdisconnected(so);
- ns_pcbdetach(nsp);
- sppstat.spps_closed++;
- return ((struct sppcb *)0);
-}
-/*
- * Someday we may do level 3 handshaking
- * to close a connection or send a xerox style error.
- * For now, just close.
- */
-struct sppcb *
-spp_usrclosed(cb)
- register struct sppcb *cb;
-{
- return (spp_close(cb));
-}
-struct sppcb *
-spp_disconnect(cb)
- register struct sppcb *cb;
-{
- return (spp_close(cb));
-}
-/*
- * Drop connection, reporting
- * the specified error.
- */
-struct sppcb *
-spp_drop(cb, errno)
- register struct sppcb *cb;
- int errno;
-{
- struct socket *so = cb->s_nspcb->nsp_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)) {
- sppstat.spps_drops++;
- cb->s_state = TCPS_CLOSED;
- /*(void) tcp_output(cb);*/
- } else
- sppstat.spps_conndrops++;
- so->so_error = errno;
- return (spp_close(cb));
-}
-
-spp_abort(nsp)
- struct nspcb *nsp;
-{
-
- (void) spp_close((struct sppcb *)nsp->nsp_pcb);
-}
-
-int spp_backoff[SPP_MAXRXTSHIFT+1] =
- { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 };
-/*
- * Fast timeout routine for processing delayed acks
- */
-spp_fasttimo()
-{
- register struct nspcb *nsp;
- register struct sppcb *cb;
- int s = splnet();
-
- nsp = nspcb.nsp_next;
- if (nsp)
- for (; nsp != &nspcb; nsp = nsp->nsp_next)
- if ((cb = (struct sppcb *)nsp->nsp_pcb) &&
- (cb->s_flags & SF_DELACK)) {
- cb->s_flags &= ~SF_DELACK;
- cb->s_flags |= SF_ACKNOW;
- sppstat.spps_delack++;
- (void) spp_output(cb, (struct mbuf *) 0);
- }
- splx(s);
-}
-
-/*
- * spp protocol timeout routine called every 500 ms.
- * Updates the timers in all active pcb's and
- * causes finite state machine actions if timers expire.
- */
-spp_slowtimo()
-{
- register struct nspcb *ip, *ipnxt;
- register struct sppcb *cb;
- int s = splnet();
- register int i;
-
- /*
- * Search through tcb's and update active timers.
- */
- ip = nspcb.nsp_next;
- if (ip == 0) {
- splx(s);
- return;
- }
- while (ip != &nspcb) {
- cb = nstosppcb(ip);
- ipnxt = ip->nsp_next;
- if (cb == 0)
- goto tpgone;
- for (i = 0; i < SPPT_NTIMERS; i++) {
- if (cb->s_timer[i] && --cb->s_timer[i] == 0) {
- (void) spp_usrreq(cb->s_nspcb->nsp_socket,
- PRU_SLOWTIMO, (struct mbuf *)0,
- (struct mbuf *)i, (struct mbuf *)0,
- (struct mbuf *)0);
- if (ipnxt->nsp_prev != ip)
- goto tpgone;
- }
- }
- cb->s_idle++;
- if (cb->s_rtt)
- cb->s_rtt++;
-tpgone:
- ip = ipnxt;
- }
- spp_iss += SPP_ISSINCR/PR_SLOWHZ; /* increment iss */
- splx(s);
-}
-/*
- * SPP timer processing.
- */
-struct sppcb *
-spp_timers(cb, timer)
- register struct sppcb *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 SPPT_2MSL:
- printf("spp: SPPT_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 SPPT_REXMT:
- if (++cb->s_rxtshift > SPP_MAXRXTSHIFT) {
- cb->s_rxtshift = SPP_MAXRXTSHIFT;
- sppstat.spps_timeoutdrop++;
- cb = spp_drop(cb, ETIMEDOUT);
- break;
- }
- sppstat.spps_rexmttimeo++;
- rexmt = ((cb->s_srtt >> 2) + cb->s_rttvar) >> 1;
- rexmt *= spp_backoff[cb->s_rxtshift];
- SPPT_RANGESET(cb->s_rxtcur, rexmt, SPPTV_MIN, SPPTV_REXMTMAX);
- cb->s_timer[SPPT_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 > SPP_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) spp_output(cb, (struct mbuf *) 0);
- break;
-
- /*
- * Persistance timer into zero window.
- * Force a probe to be sent.
- */
- case SPPT_PERSIST:
- sppstat.spps_persisttimeo++;
- spp_setpersist(cb);
- (void) spp_output(cb, (struct mbuf *) 0);
- break;
-
- /*
- * Keep-alive timer went off; send something
- * or drop connection if idle for too long.
- */
- case SPPT_KEEP:
- sppstat.spps_keeptimeo++;
- if (cb->s_state < TCPS_ESTABLISHED)
- goto dropit;
- if (cb->s_nspcb->nsp_socket->so_options & SO_KEEPALIVE) {
- if (cb->s_idle >= SPPTV_MAXIDLE)
- goto dropit;
- sppstat.spps_keepprobe++;
- (void) spp_output(cb, (struct mbuf *) 0);
- } else
- cb->s_idle = 0;
- cb->s_timer[SPPT_KEEP] = SPPTV_KEEP;
- break;
- dropit:
- sppstat.spps_keepdrops++;
- cb = spp_drop(cb, ETIMEDOUT);
- break;
- }
- return (cb);
-}
-#ifndef lint
-int SppcbSize = sizeof (struct sppcb);
-int NspcbSize = sizeof (struct nspcb);
-#endif /* lint */
projects / apple / xnu.git / blobdiff