/*- * Copyright (c) 1984, 1985, 1986, 1987, 1993 * The Regents of the University of California. * Copyright (c) 2004-2009 Robert N. M. Watson * 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. * 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. * * Copyright (c) 1995, Mike Mitchell * 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 */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * SPX protocol implementation. */ static struct mtx spx_mtx; /* Protects only spx_iss. */ static u_short spx_iss; u_short spx_newchecks[50]; static int spx_hardnosed; static int traceallspxs = 0; struct spx_istat spx_istat; #define SPX_LOCK_INIT() mtx_init(&spx_mtx, "spx_mtx", NULL, MTX_DEF) #define SPX_LOCK() mtx_lock(&spx_mtx) #define SPX_UNLOCK() mtx_unlock(&spx_mtx) static const int spx_backoff[SPX_MAXRXTSHIFT+1] = { 1, 2, 4, 8, 16, 32, 64, 64, 64, 64, 64, 64, 64 }; static void spx_close(struct spxpcb *cb); static void spx_disconnect(struct spxpcb *cb); static void spx_drop(struct spxpcb *cb, int errno); static void spx_setpersist(struct spxpcb *cb); static void spx_template(struct spxpcb *cb); static void spx_timers(struct spxpcb *cb, int timer); static void spx_usrclosed(struct spxpcb *cb); static void spx_usr_abort(struct socket *so); static int spx_accept(struct socket *so, struct sockaddr **nam); static int spx_attach(struct socket *so, int proto, struct thread *td); static int spx_bind(struct socket *so, struct sockaddr *nam, struct thread *td); static void spx_usr_close(struct socket *so); static int spx_connect(struct socket *so, struct sockaddr *nam, struct thread *td); static void spx_detach(struct socket *so); static void spx_pcbdetach(struct ipxpcb *ipxp); static int spx_usr_disconnect(struct socket *so); static int spx_listen(struct socket *so, int backlog, struct thread *td); static int spx_rcvd(struct socket *so, int flags); static int spx_rcvoob(struct socket *so, struct mbuf *m, int flags); static int spx_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, struct mbuf *control, struct thread *td); static int spx_shutdown(struct socket *so); static int spx_sp_attach(struct socket *so, int proto, struct thread *td); struct pr_usrreqs spx_usrreqs = { .pru_abort = spx_usr_abort, .pru_accept = spx_accept, .pru_attach = spx_attach, .pru_bind = spx_bind, .pru_connect = spx_connect, .pru_control = ipx_control, .pru_detach = spx_detach, .pru_disconnect = spx_usr_disconnect, .pru_listen = spx_listen, .pru_peeraddr = ipx_peeraddr, .pru_rcvd = spx_rcvd, .pru_rcvoob = spx_rcvoob, .pru_send = spx_send, .pru_shutdown = spx_shutdown, .pru_sockaddr = ipx_sockaddr, .pru_close = spx_usr_close, }; struct pr_usrreqs spx_usrreq_sps = { .pru_abort = spx_usr_abort, .pru_accept = spx_accept, .pru_attach = spx_sp_attach, .pru_bind = spx_bind, .pru_connect = spx_connect, .pru_control = ipx_control, .pru_detach = spx_detach, .pru_disconnect = spx_usr_disconnect, .pru_listen = spx_listen, .pru_peeraddr = ipx_peeraddr, .pru_rcvd = spx_rcvd, .pru_rcvoob = spx_rcvoob, .pru_send = spx_send, .pru_shutdown = spx_shutdown, .pru_sockaddr = ipx_sockaddr, .pru_close = spx_usr_close, }; void spx_init(void) { SPX_LOCK_INIT(); spx_iss = 1; /* WRONG !! should fish it out of TODR */ } void spx_input(struct mbuf *m, struct ipxpcb *ipxp) { struct spxpcb *cb; struct spx *si = mtod(m, struct spx *); struct socket *so; struct spx spx_savesi; int dropsocket = 0; short ostate = 0; spxstat.spxs_rcvtotal++; KASSERT(ipxp != NULL, ("spx_input: ipxpcb == NULL")); /* * spx_input() assumes that the caller will hold both the pcb list * lock and also the ipxp lock. spx_input() will release both before * returning, and may in fact trade in the ipxp lock for another pcb * lock following sonewconn(). */ IPX_LIST_LOCK_ASSERT(); IPX_LOCK_ASSERT(ipxp); cb = ipxtospxpcb(ipxp); KASSERT(cb != NULL, ("spx_input: cb == NULL")); if (ipxp->ipxp_flags & IPXP_DROPPED) goto drop; if (m->m_len < sizeof(*si)) { if ((m = m_pullup(m, sizeof(*si))) == NULL) { IPX_UNLOCK(ipxp); IPX_LIST_UNLOCK(); 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; KASSERT(so != NULL, ("spx_input: so == NULL")); #ifdef MAC if (mac_socket_check_deliver(so, m) != 0) goto drop; #endif 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 == NULL) 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. * * XXXRW: In the new world order of real kernel parallelism, * temporarily allocating the socket when we're "not sure" * seems like a bad idea, as we might race to remove it if * the listen socket is closed...? * * We drop the lock of the listen socket ipxp, and acquire * the lock of the new socket ippx. */ dropsocket++; IPX_UNLOCK(ipxp); ipxp = (struct ipxpcb *)so->so_pcb; IPX_LOCK(ipxp); 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; } IPX_LOCK_ASSERT(ipxp); /* * 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 sockaddr_ipx *sipx, ssipx; 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; } sipx = &ssipx; bzero(sipx, sizeof *sipx); 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, (struct sockaddr *)sipx, &thread0)) { ipxp->ipxp_laddr = laddr; spx_istat.noconn++; goto drop; } 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; case TCPS_SYN_RECEIVED: { /* * This state means that we have heard a response to our * acceptance of their connection. It is probably logically * unnecessary in this implementation. */ 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; case TCPS_SYN_SENT: /* * 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. */ 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, m, 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(m); 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); } void spx_ctlinput(int cmd, struct sockaddr *arg_as_sa, void *dummy) { /* Currently, nothing. */ } int spx_output(struct spxpcb *cb, struct mbuf *m0) { struct socket *so = cb->s_ipxpcb->ipxp_socket; struct mbuf *m = NULL; 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_NOWAIT); 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_NOWAIT, 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_NOWAIT, 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 non-zero 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 * non-zero, 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 = NULL; m = NULL; if (len > 0) { cb->s_want = cb->s_snxt; for (m = sb->sb_mb; m != NULL; m = m->m_nextpkt) { 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) { spxstat.spxs_sndvoid++; si = NULL; m = NULL; } else cb->s_snxt++; } } /* * 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 (m != NULL) { /* * Must make a copy of this packet for ipx_output to monkey * with. */ m = m_copy(m, 0, 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_NOWAIT, 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); #ifdef MAC mac_socket_create_mbuf(so, m); #endif 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); } cb = malloc(sizeof *cb, M_PCB, M_NOWAIT | M_ZERO); if (cb == NULL) return (ENOBUFS); mm = m_getclr(M_NOWAIT, 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_state = TCPS_LISTEN; cb->s_smax = -1; cb->s_swl1 = -1; spx_reass_init(cb); 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; IPX_LOCK_ASSERT(ipxp); cb = ipxtospxpcb(ipxp); KASSERT(cb != NULL, ("spx_pcbdetach: cb == NULL")); spx_reass_flush(cb); 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_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 sockbuf *sb = &(ipxp->ipxp_socket->so_snd); IPX_LOCK_ASSERT(ipxp); cb->s_ipx.ipx_pt = IPXPROTO_SPX; cb->s_ipx.ipx_sna = ipxp->ipxp_laddr; cb->s_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, 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); } }