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-rw-r--r--sys/netccitt/pk_input.c1119
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diff --git a/sys/netccitt/pk_input.c b/sys/netccitt/pk_input.c
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+++ b/sys/netccitt/pk_input.c
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+/*
+ * Copyright (c) University of British Columbia, 1984
+ * Copyright (C) Computer Science Department IV,
+ * University of Erlangen-Nuremberg, Germany, 1992
+ * Copyright (c) 1991, 1992, 1993
+ * The Regents of the University of California. All rights reserved.
+ *
+ * This code is derived from software contributed to Berkeley by the
+ * Laboratory for Computation Vision and the Computer Science Department
+ * of the the University of British Columbia and the Computer Science
+ * Department (IV) of the University of Erlangen-Nuremberg, Germany.
+ *
+ * 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.
+ *
+ * @(#)pk_input.c 8.1 (Berkeley) 6/10/93
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/mbuf.h>
+#include <sys/socket.h>
+#include <sys/protosw.h>
+#include <sys/socketvar.h>
+#include <sys/errno.h>
+
+#include <net/if.h>
+#include <net/if_dl.h>
+#include <net/if_llc.h>
+#include <net/route.h>
+
+#include <netccitt/dll.h>
+#include <netccitt/x25.h>
+#include <netccitt/pk.h>
+#include <netccitt/pk_var.h>
+#include <netccitt/llc_var.h>
+
+struct pkcb_q pkcb_q = {&pkcb_q, &pkcb_q};
+
+/*
+ * ccittintr() is the generic interrupt handler for HDLC, LLC2, and X.25. This
+ * allows to have kernel running X.25 but no HDLC or LLC2 or both (in case we
+ * employ boards that do all the stuff themselves, e.g. ADAX X.25 or TPS ISDN.)
+ */
+void
+ccittintr ()
+{
+ extern struct ifqueue pkintrq;
+ extern struct ifqueue hdintrq;
+ extern struct ifqueue llcintrq;
+
+#ifdef HDLC
+ if (hdintrq.ifq_len)
+ hdintr ();
+#endif
+#ifdef LLC
+ if (llcintrq.ifq_len)
+ llcintr ();
+#endif
+ if (pkintrq.ifq_len)
+ pkintr ();
+}
+
+struct pkcb *
+pk_newlink (ia, llnext)
+struct x25_ifaddr *ia;
+caddr_t llnext;
+{
+ register struct x25config *xcp = &ia -> ia_xc;
+ register struct pkcb *pkp;
+ register struct pklcd *lcp;
+ register struct protosw *pp;
+ unsigned size;
+
+ pp = pffindproto (AF_CCITT, (int) xcp -> xc_lproto, 0);
+ if (pp == 0 || pp -> pr_output == 0) {
+ pk_message (0, xcp, "link level protosw error");
+ return ((struct pkcb *)0);
+ }
+ /*
+ * Allocate a network control block structure
+ */
+ size = sizeof (struct pkcb);
+ pkp = (struct pkcb *) malloc (size, M_PCB, M_WAITOK);
+ if (pkp == 0)
+ return ((struct pkcb *)0);
+ bzero ((caddr_t) pkp, size);
+ pkp -> pk_lloutput = pp -> pr_output;
+ pkp -> pk_llctlinput = (caddr_t (*)()) pp -> pr_ctlinput;
+ pkp -> pk_xcp = xcp;
+ pkp -> pk_ia = ia;
+ pkp -> pk_state = DTE_WAITING;
+ pkp -> pk_llnext = llnext;
+ insque (pkp, &pkcb_q);
+
+ /*
+ * set defaults
+ */
+
+ if (xcp -> xc_pwsize == 0)
+ xcp -> xc_pwsize = DEFAULT_WINDOW_SIZE;
+ if (xcp -> xc_psize == 0)
+ xcp -> xc_psize = X25_PS128;
+ /*
+ * Allocate logical channel descriptor vector
+ */
+
+ (void) pk_resize (pkp);
+ return (pkp);
+}
+
+
+pk_dellink (pkp)
+register struct pkcb *pkp;
+{
+ register int i;
+ register struct protosw *pp;
+
+ /*
+ * Essentially we have the choice to
+ * (a) go ahead and let the route be deleted and
+ * leave the pkcb associated with that route
+ * as it is, i.e. the connections stay open
+ * (b) do a pk_disconnect() on all channels associated
+ * with the route via the pkcb and then proceed.
+ *
+ * For the time being we stick with (b)
+ */
+
+ for (i = 1; i < pkp -> pk_maxlcn; ++i)
+ if (pkp -> pk_chan[i])
+ pk_disconnect (pkp -> pk_chan[i]);
+
+ /*
+ * Free the pkcb
+ */
+
+ /*
+ * First find the protoswitch to get hold of the link level
+ * protocol to be notified that the packet level entity is
+ * dissolving ...
+ */
+ pp = pffindproto (AF_CCITT, (int) pkp -> pk_xcp -> xc_lproto, 0);
+ if (pp == 0 || pp -> pr_output == 0) {
+ pk_message (0, pkp -> pk_xcp, "link level protosw error");
+ return (EPROTONOSUPPORT);
+ }
+
+ pkp -> pk_refcount--;
+ if (!pkp -> pk_refcount) {
+ struct dll_ctlinfo ctlinfo;
+
+ remque (pkp);
+ if (pkp -> pk_rt -> rt_llinfo == (caddr_t) pkp)
+ pkp -> pk_rt -> rt_llinfo = (caddr_t) NULL;
+
+ /*
+ * Tell the link level that the pkcb is dissolving
+ */
+ if (pp -> pr_ctlinput && pkp -> pk_llnext) {
+ ctlinfo.dlcti_pcb = pkp -> pk_llnext;
+ ctlinfo.dlcti_rt = pkp -> pk_rt;
+ (pp -> pr_ctlinput)(PRC_DISCONNECT_REQUEST,
+ pkp -> pk_xcp, &ctlinfo);
+ }
+ free ((caddr_t) pkp -> pk_chan, M_IFADDR);
+ free ((caddr_t) pkp, M_PCB);
+ }
+
+ return (0);
+}
+
+
+pk_resize (pkp)
+register struct pkcb *pkp;
+{
+ struct pklcd *dev_lcp = 0;
+ struct x25config *xcp = pkp -> pk_xcp;
+ if (pkp -> pk_chan &&
+ (pkp -> pk_maxlcn != xcp -> xc_maxlcn)) {
+ pk_restart (pkp, X25_RESTART_NETWORK_CONGESTION);
+ dev_lcp = pkp -> pk_chan[0];
+ free ((caddr_t) pkp -> pk_chan, M_IFADDR);
+ pkp -> pk_chan = 0;
+ }
+ if (pkp -> pk_chan == 0) {
+ unsigned size;
+ pkp -> pk_maxlcn = xcp -> xc_maxlcn;
+ size = (pkp -> pk_maxlcn + 1) * sizeof (struct pklcd *);
+ pkp -> pk_chan =
+ (struct pklcd **) malloc (size, M_IFADDR, M_WAITOK);
+ if (pkp -> pk_chan) {
+ bzero ((caddr_t) pkp -> pk_chan, size);
+ /*
+ * Allocate a logical channel descriptor for lcn 0
+ */
+ if (dev_lcp == 0 &&
+ (dev_lcp = pk_attach ((struct socket *)0)) == 0)
+ return (ENOBUFS);
+ dev_lcp -> lcd_state = READY;
+ dev_lcp -> lcd_pkp = pkp;
+ pkp -> pk_chan[0] = dev_lcp;
+ } else {
+ if (dev_lcp)
+ pk_close (dev_lcp);
+ return (ENOBUFS);
+ }
+ }
+ return 0;
+}
+
+/*
+ * This procedure is called by the link level whenever the link
+ * becomes operational, is reset, or when the link goes down.
+ */
+/*VARARGS*/
+caddr_t
+pk_ctlinput (code, src, addr)
+ struct sockaddr *src;
+ caddr_t addr;
+{
+ register struct pkcb *pkp = (struct pkcb *) addr;
+
+ switch (code) {
+ case PRC_LINKUP:
+ if (pkp -> pk_state == DTE_WAITING)
+ pk_restart (pkp, X25_RESTART_NETWORK_CONGESTION);
+ break;
+
+ case PRC_LINKDOWN:
+ pk_restart (pkp, -1); /* Clear all active circuits */
+ pkp -> pk_state = DTE_WAITING;
+ break;
+
+ case PRC_LINKRESET:
+ pk_restart (pkp, X25_RESTART_NETWORK_CONGESTION);
+ break;
+
+ case PRC_CONNECT_INDICATION: {
+ struct rtentry *llrt;
+
+ if ((llrt = rtalloc1(src, 0)) == 0)
+ return 0;
+ else llrt -> rt_refcnt--;
+
+ pkp = (((struct npaidbentry *) llrt -> rt_llinfo) -> np_rt) ?
+ (struct pkcb *)(((struct npaidbentry *) llrt -> rt_llinfo) -> np_rt -> rt_llinfo) : (struct pkcb *) 0;
+ if (pkp == (struct pkcb *) 0)
+ return 0;
+ pkp -> pk_llnext = addr;
+
+ return ((caddr_t) pkp);
+ }
+ case PRC_DISCONNECT_INDICATION:
+ pk_restart (pkp, -1) ; /* Clear all active circuits */
+ pkp -> pk_state = DTE_WAITING;
+ pkp -> pk_llnext = (caddr_t) 0;
+ }
+ return (0);
+}
+struct ifqueue pkintrq;
+/*
+ * This routine is called if there are semi-smart devices that do HDLC
+ * in hardware and want to queue the packet and call level 3 directly
+ */
+pkintr ()
+{
+ register struct mbuf *m;
+ register struct ifaddr *ifa;
+ register struct ifnet *ifp;
+ register int s;
+
+ for (;;) {
+ s = splimp ();
+ IF_DEQUEUE (&pkintrq, m);
+ splx (s);
+ if (m == 0)
+ break;
+ if (m -> m_len < PKHEADERLN) {
+ printf ("pkintr: packet too short (len=%d)\n",
+ m -> m_len);
+ m_freem (m);
+ continue;
+ }
+ pk_input (m);
+ }
+}
+struct mbuf *pk_bad_packet;
+struct mbuf_cache pk_input_cache = {0 };
+/*
+ * X.25 PACKET INPUT
+ *
+ * This procedure is called by a link level procedure whenever
+ * an information frame is received. It decodes the packet and
+ * demultiplexes based on the logical channel number.
+ *
+ * We change the original conventions of the UBC code here --
+ * since there may be multiple pkcb's for a given interface
+ * of type 802.2 class 2, we retrieve which one it is from
+ * m_pkthdr.rcvif (which has been overwritten by lower layers);
+ * That field is then restored for the benefit of upper layers which
+ * may make use of it, such as CLNP.
+ *
+ */
+
+#define RESTART_DTE_ORIGINATED(xp) (((xp) -> packet_cause == X25_RESTART_DTE_ORIGINATED) || \
+ ((xp) -> packet_cause >= X25_RESTART_DTE_ORIGINATED2))
+
+pk_input (m)
+register struct mbuf *m;
+{
+ register struct x25_packet *xp;
+ register struct pklcd *lcp;
+ register struct socket *so = 0;
+ register struct pkcb *pkp;
+ int ptype, lcn, lcdstate = LISTEN;
+
+ if (pk_input_cache.mbc_size || pk_input_cache.mbc_oldsize)
+ mbuf_cache (&pk_input_cache, m);
+ if ((m -> m_flags & M_PKTHDR) == 0)
+ panic ("pkintr");
+
+ if ((pkp = (struct pkcb *) m -> m_pkthdr.rcvif) == 0)
+ return;
+ xp = mtod (m, struct x25_packet *);
+ ptype = pk_decode (xp);
+ lcn = LCN(xp);
+ lcp = pkp -> pk_chan[lcn];
+
+ /*
+ * If the DTE is in Restart state, then it will ignore data,
+ * interrupt, call setup and clearing, flow control and reset
+ * packets.
+ */
+ if (lcn < 0 || lcn > pkp -> pk_maxlcn) {
+ pk_message (lcn, pkp -> pk_xcp, "illegal lcn");
+ m_freem (m);
+ return;
+ }
+
+ pk_trace (pkp -> pk_xcp, m, "P-In");
+
+ if (pkp -> pk_state != DTE_READY && ptype != RESTART && ptype != RESTART_CONF) {
+ m_freem (m);
+ return;
+ }
+ if (lcp) {
+ so = lcp -> lcd_so;
+ lcdstate = lcp -> lcd_state;
+ } else {
+ if (ptype == CLEAR) { /* idle line probe (Datapac specific) */
+ /* send response on lcd 0's output queue */
+ lcp = pkp -> pk_chan[0];
+ lcp -> lcd_template = pk_template (lcn, X25_CLEAR_CONFIRM);
+ pk_output (lcp);
+ m_freem (m);
+ return;
+ }
+ if (ptype != CALL)
+ ptype = INVALID_PACKET;
+ }
+
+ if (lcn == 0 && ptype != RESTART && ptype != RESTART_CONF) {
+ pk_message (0, pkp -> pk_xcp, "illegal ptype (%d, %s) on lcn 0",
+ ptype, pk_name[ptype / MAXSTATES]);
+ if (pk_bad_packet)
+ m_freem (pk_bad_packet);
+ pk_bad_packet = m;
+ return;
+ }
+
+ m -> m_pkthdr.rcvif = pkp -> pk_ia -> ia_ifp;
+
+ switch (ptype + lcdstate) {
+ /*
+ * Incoming Call packet received.
+ */
+ case CALL + LISTEN:
+ pk_incoming_call (pkp, m);
+ break;
+
+ /*
+ * Call collision: Just throw this "incoming call" away since
+ * the DCE will ignore it anyway.
+ */
+ case CALL + SENT_CALL:
+ pk_message ((int) lcn, pkp -> pk_xcp,
+ "incoming call collision");
+ break;
+
+ /*
+ * Call confirmation packet received. This usually means our
+ * previous connect request is now complete.
+ */
+ case CALL_ACCEPTED + SENT_CALL:
+ MCHTYPE(m, MT_CONTROL);
+ pk_call_accepted (lcp, m);
+ break;
+
+ /*
+ * This condition can only happen if the previous state was
+ * SENT_CALL. Just ignore the packet, eventually a clear
+ * confirmation should arrive.
+ */
+ case CALL_ACCEPTED + SENT_CLEAR:
+ break;
+
+ /*
+ * Clear packet received. This requires a complete tear down
+ * of the virtual circuit. Free buffers and control blocks.
+ * and send a clear confirmation.
+ */
+ case CLEAR + READY:
+ case CLEAR + RECEIVED_CALL:
+ case CLEAR + SENT_CALL:
+ case CLEAR + DATA_TRANSFER:
+ lcp -> lcd_state = RECEIVED_CLEAR;
+ lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_CLEAR_CONFIRM);
+ pk_output (lcp);
+ pk_clearcause (pkp, xp);
+ if (lcp -> lcd_upper) {
+ MCHTYPE(m, MT_CONTROL);
+ lcp -> lcd_upper (lcp, m);
+ }
+ pk_close (lcp);
+ lcp = 0;
+ break;
+
+ /*
+ * Clear collision: Treat this clear packet as a confirmation.
+ */
+ case CLEAR + SENT_CLEAR:
+ pk_close (lcp);
+ break;
+
+ /*
+ * Clear confirmation received. This usually means the virtual
+ * circuit is now completely removed.
+ */
+ case CLEAR_CONF + SENT_CLEAR:
+ pk_close (lcp);
+ break;
+
+ /*
+ * A clear confirmation on an unassigned logical channel - just
+ * ignore it. Note: All other packets on an unassigned channel
+ * results in a clear.
+ */
+ case CLEAR_CONF + READY:
+ case CLEAR_CONF + LISTEN:
+ break;
+
+ /*
+ * Data packet received. Pass on to next level. Move the Q and M
+ * bits into the data portion for the next level.
+ */
+ case DATA + DATA_TRANSFER:
+ if (lcp -> lcd_reset_condition) {
+ ptype = DELETE_PACKET;
+ break;
+ }
+
+ /*
+ * Process the P(S) flow control information in this Data packet.
+ * Check that the packets arrive in the correct sequence and that
+ * they are within the "lcd_input_window". Input window rotation is
+ * initiated by the receive interface.
+ */
+
+ if (PS(xp) != ((lcp -> lcd_rsn + 1) % MODULUS) ||
+ PS(xp) == ((lcp -> lcd_input_window + lcp -> lcd_windowsize) % MODULUS)) {
+ m_freem (m);
+ pk_procerror (RESET, lcp, "p(s) flow control error", 1);
+ break;
+ }
+ lcp -> lcd_rsn = PS(xp);
+
+ if (pk_ack (lcp, PR(xp)) != PACKET_OK) {
+ m_freem (m);
+ break;
+ }
+ m -> m_data += PKHEADERLN;
+ m -> m_len -= PKHEADERLN;
+ m -> m_pkthdr.len -= PKHEADERLN;
+
+ lcp -> lcd_rxcnt++;
+ if (lcp -> lcd_flags & X25_MBS_HOLD) {
+ register struct mbuf *n = lcp -> lcd_cps;
+ int mbit = MBIT(xp);
+ octet q_and_d_bits;
+
+ if (n) {
+ n -> m_pkthdr.len += m -> m_pkthdr.len;
+ while (n -> m_next)
+ n = n -> m_next;
+ n -> m_next = m;
+ m = lcp -> lcd_cps;
+
+ if (lcp -> lcd_cpsmax &&
+ n -> m_pkthdr.len > lcp -> lcd_cpsmax) {
+ pk_procerror (RESET, lcp,
+ "C.P.S. overflow", 128);
+ return;
+ }
+ q_and_d_bits = 0xc0 & *(octet *) xp;
+ xp = (struct x25_packet *)
+ (mtod (m, octet *) - PKHEADERLN);
+ *(octet *) xp |= q_and_d_bits;
+ }
+ if (mbit) {
+ lcp -> lcd_cps = m;
+ pk_flowcontrol (lcp, 0, 1);
+ return;
+ }
+ lcp -> lcd_cps = 0;
+ }
+ if (so == 0)
+ break;
+ if (lcp -> lcd_flags & X25_MQBIT) {
+ octet t = (X25GBITS(xp -> bits, q_bit)) ? t = 0x80 : 0;
+
+ if (MBIT(xp))
+ t |= 0x40;
+ m -> m_data -= 1;
+ m -> m_len += 1;
+ m -> m_pkthdr.len += 1;
+ *mtod (m, octet *) = t;
+ }
+
+ /*
+ * Discard Q-BIT packets if the application
+ * doesn't want to be informed of M and Q bit status
+ */
+ if (X25GBITS(xp -> bits, q_bit)
+ && (lcp -> lcd_flags & X25_MQBIT) == 0) {
+ m_freem (m);
+ /*
+ * NB. This is dangerous: sending a RR here can
+ * cause sequence number errors if a previous data
+ * packet has not yet been passed up to the application
+ * (RR's are normally generated via PRU_RCVD).
+ */
+ pk_flowcontrol (lcp, 0, 1);
+ } else {
+ sbappendrecord (&so -> so_rcv, m);
+ sorwakeup (so);
+ }
+ break;
+
+ /*
+ * Interrupt packet received.
+ */
+ case INTERRUPT + DATA_TRANSFER:
+ if (lcp -> lcd_reset_condition)
+ break;
+ lcp -> lcd_intrdata = xp -> packet_data;
+ lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_INTERRUPT_CONFIRM);
+ pk_output (lcp);
+ m -> m_data += PKHEADERLN;
+ m -> m_len -= PKHEADERLN;
+ m -> m_pkthdr.len -= PKHEADERLN;
+ MCHTYPE(m, MT_OOBDATA);
+ if (so) {
+ if (so -> so_options & SO_OOBINLINE)
+ sbinsertoob (&so -> so_rcv, m);
+ else
+ m_freem (m);
+ sohasoutofband (so);
+ }
+ break;
+
+ /*
+ * Interrupt confirmation packet received.
+ */
+ case INTERRUPT_CONF + DATA_TRANSFER:
+ if (lcp -> lcd_reset_condition)
+ break;
+ if (lcp -> lcd_intrconf_pending == TRUE)
+ lcp -> lcd_intrconf_pending = FALSE;
+ else
+ pk_procerror (RESET, lcp, "unexpected packet", 43);
+ break;
+
+ /*
+ * Receiver ready received. Rotate the output window and output
+ * any data packets waiting transmission.
+ */
+ case RR + DATA_TRANSFER:
+ if (lcp -> lcd_reset_condition ||
+ pk_ack (lcp, PR(xp)) != PACKET_OK) {
+ ptype = DELETE_PACKET;
+ break;
+ }
+ if (lcp -> lcd_rnr_condition == TRUE)
+ lcp -> lcd_rnr_condition = FALSE;
+ pk_output (lcp);
+ break;
+
+ /*
+ * Receiver Not Ready received. Packets up to the P(R) can be
+ * be sent. Condition is cleared with a RR.
+ */
+ case RNR + DATA_TRANSFER:
+ if (lcp -> lcd_reset_condition ||
+ pk_ack (lcp, PR(xp)) != PACKET_OK) {
+ ptype = DELETE_PACKET;
+ break;
+ }
+ lcp -> lcd_rnr_condition = TRUE;
+ break;
+
+ /*
+ * Reset packet received. Set state to FLOW_OPEN. The Input and
+ * Output window edges ar set to zero. Both the send and receive
+ * numbers are reset. A confirmation is returned.
+ */
+ case RESET + DATA_TRANSFER:
+ if (lcp -> lcd_reset_condition)
+ /* Reset collision. Just ignore packet. */
+ break;
+
+ pk_resetcause (pkp, xp);
+ lcp -> lcd_window_condition = lcp -> lcd_rnr_condition =
+ lcp -> lcd_intrconf_pending = FALSE;
+ lcp -> lcd_output_window = lcp -> lcd_input_window =
+ lcp -> lcd_last_transmitted_pr = 0;
+ lcp -> lcd_ssn = 0;
+ lcp -> lcd_rsn = MODULUS - 1;
+
+ lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_RESET_CONFIRM);
+ pk_output (lcp);
+
+ pk_flush (lcp);
+ if (so == 0)
+ break;
+ wakeup ((caddr_t) & so -> so_timeo);
+ sorwakeup (so);
+ sowwakeup (so);
+ break;
+
+ /*
+ * Reset confirmation received.
+ */
+ case RESET_CONF + DATA_TRANSFER:
+ if (lcp -> lcd_reset_condition) {
+ lcp -> lcd_reset_condition = FALSE;
+ pk_output (lcp);
+ }
+ else
+ pk_procerror (RESET, lcp, "unexpected packet", 32);
+ break;
+
+ case DATA + SENT_CLEAR:
+ ptype = DELETE_PACKET;
+ case RR + SENT_CLEAR:
+ case RNR + SENT_CLEAR:
+ case INTERRUPT + SENT_CLEAR:
+ case INTERRUPT_CONF + SENT_CLEAR:
+ case RESET + SENT_CLEAR:
+ case RESET_CONF + SENT_CLEAR:
+ /* Just ignore p if we have sent a CLEAR already.
+ */
+ break;
+
+ /*
+ * Restart sets all the permanent virtual circuits to the "Data
+ * Transfer" stae and all the switched virtual circuits to the
+ * "Ready" state.
+ */
+ case RESTART + READY:
+ switch (pkp -> pk_state) {
+ case DTE_SENT_RESTART:
+ /*
+ * Restart collision.
+ * If case the restart cause is "DTE originated" we
+ * have a DTE-DTE situation and are trying to resolve
+ * who is going to play DTE/DCE [ISO 8208:4.2-4.5]
+ */
+ if (RESTART_DTE_ORIGINATED(xp)) {
+ pk_restart (pkp, X25_RESTART_DTE_ORIGINATED);
+ pk_message (0, pkp -> pk_xcp,
+ "RESTART collision");
+ if ((pkp -> pk_restartcolls++) > MAXRESTARTCOLLISIONS) {
+ pk_message (0, pkp -> pk_xcp,
+ "excessive RESTART collisions");
+ pkp -> pk_restartcolls = 0;
+ }
+ break;
+ }
+ pkp -> pk_state = DTE_READY;
+ pkp -> pk_dxerole |= DTE_PLAYDTE;
+ pkp -> pk_dxerole &= ~DTE_PLAYDCE;
+ pk_message (0, pkp -> pk_xcp,
+ "Packet level operational");
+ pk_message (0, pkp -> pk_xcp,
+ "Assuming DTE role");
+ if (pkp -> pk_dxerole & DTE_CONNECTPENDING)
+ pk_callcomplete (pkp);
+ break;
+
+ default:
+ pk_restart (pkp, -1);
+ pk_restartcause (pkp, xp);
+ pkp -> pk_chan[0] -> lcd_template = pk_template (0,
+ X25_RESTART_CONFIRM);
+ pk_output (pkp -> pk_chan[0]);
+ pkp -> pk_state = DTE_READY;
+ pkp -> pk_dxerole |= RESTART_DTE_ORIGINATED(xp) ? DTE_PLAYDCE :
+ DTE_PLAYDTE;
+ if (pkp -> pk_dxerole & DTE_PLAYDTE) {
+ pkp -> pk_dxerole &= ~DTE_PLAYDCE;
+ pk_message (0, pkp -> pk_xcp,
+ "Assuming DTE role");
+ } else {
+ pkp -> pk_dxerole &= ~DTE_PLAYDTE;
+ pk_message (0, pkp -> pk_xcp,
+ "Assuming DCE role");
+ }
+ if (pkp -> pk_dxerole & DTE_CONNECTPENDING)
+ pk_callcomplete (pkp);
+ }
+ break;
+
+ /*
+ * Restart confirmation received. All logical channels are set
+ * to READY.
+ */
+ case RESTART_CONF + READY:
+ switch (pkp -> pk_state) {
+ case DTE_SENT_RESTART:
+ pkp -> pk_state = DTE_READY;
+ pkp -> pk_dxerole |= DTE_PLAYDTE;
+ pkp -> pk_dxerole &= ~DTE_PLAYDCE;
+ pk_message (0, pkp -> pk_xcp,
+ "Packet level operational");
+ pk_message (0, pkp -> pk_xcp,
+ "Assuming DTE role");
+ if (pkp -> pk_dxerole & DTE_CONNECTPENDING)
+ pk_callcomplete (pkp);
+ break;
+
+ default:
+ /* Restart local procedure error. */
+ pk_restart (pkp, X25_RESTART_LOCAL_PROCEDURE_ERROR);
+ pkp -> pk_state = DTE_SENT_RESTART;
+ pkp -> pk_dxerole &= ~(DTE_PLAYDTE | DTE_PLAYDCE);
+ }
+ break;
+
+ default:
+ if (lcp) {
+ pk_procerror (CLEAR, lcp, "unknown packet error", 33);
+ pk_message (lcn, pkp -> pk_xcp,
+ "\"%s\" unexpected in \"%s\" state",
+ pk_name[ptype/MAXSTATES], pk_state[lcdstate]);
+ } else
+ pk_message (lcn, pkp -> pk_xcp,
+ "packet arrived on unassigned lcn");
+ break;
+ }
+ if (so == 0 && lcp && lcp -> lcd_upper && lcdstate == DATA_TRANSFER) {
+ if (ptype != DATA && ptype != INTERRUPT)
+ MCHTYPE(m, MT_CONTROL);
+ lcp -> lcd_upper (lcp, m);
+ } else if (ptype != DATA && ptype != INTERRUPT)
+ m_freem (m);
+}
+
+static
+prune_dnic (from, to, dnicname, xcp)
+char *from, *to, *dnicname;
+register struct x25config *xcp;
+{
+ register char *cp1 = from, *cp2 = from;
+ if (xcp -> xc_prepnd0 && *cp1 == '0') {
+ from = ++cp1;
+ goto copyrest;
+ }
+ if (xcp -> xc_nodnic) {
+ for (cp1 = dnicname; *cp2 = *cp1++;)
+ cp2++;
+ cp1 = from;
+ }
+copyrest:
+ for (cp1 = dnicname; *cp2 = *cp1++;)
+ cp2++;
+}
+/* static */
+pk_simple_bsd (from, to, lower, len)
+register octet *from, *to;
+register len, lower;
+{
+ register int c;
+ while (--len >= 0) {
+ c = *from;
+ if (lower & 0x01)
+ *from++;
+ else
+ c >>= 4;
+ c &= 0x0f; c |= 0x30; *to++ = c; lower++;
+ }
+ *to = 0;
+}
+
+/*static octet * */
+pk_from_bcd (a, iscalling, sa, xcp)
+register struct x25_calladdr *a;
+register struct sockaddr_x25 *sa;
+register struct x25config *xcp;
+{
+ octet buf[MAXADDRLN+1];
+ octet *cp;
+ unsigned count;
+
+ bzero ((caddr_t) sa, sizeof (*sa));
+ sa -> x25_len = sizeof (*sa);
+ sa -> x25_family = AF_CCITT;
+ if (iscalling) {
+ cp = a -> address_field + (X25GBITS(a -> addrlens, called_addrlen) / 2);
+ count = X25GBITS(a -> addrlens, calling_addrlen);
+ pk_simple_bsd (cp, buf, X25GBITS(a -> addrlens, called_addrlen), count);
+ } else {
+ count = X25GBITS(a -> addrlens, called_addrlen);
+ pk_simple_bsd (a -> address_field, buf, 0, count);
+ }
+ if (xcp -> xc_addr.x25_net && (xcp -> xc_nodnic || xcp -> xc_prepnd0)) {
+ octet dnicname[sizeof (long) * NBBY/3 + 2];
+
+ sprintf ((char *) dnicname, "%d", xcp -> xc_addr.x25_net);
+ prune_dnic ((char *) buf, sa -> x25_addr, dnicname, xcp);
+ } else
+ bcopy ((caddr_t) buf, (caddr_t) sa -> x25_addr, count + 1);
+}
+
+static
+save_extra (m0, fp, so)
+struct mbuf *m0;
+octet *fp;
+struct socket *so;
+{
+ register struct mbuf *m;
+ struct cmsghdr cmsghdr;
+ if (m = m_copy (m, 0, (int)M_COPYALL)) {
+ int off = fp - mtod (m0, octet *);
+ int len = m -> m_pkthdr.len - off + sizeof (cmsghdr);
+ cmsghdr.cmsg_len = len;
+ cmsghdr.cmsg_level = AF_CCITT;
+ cmsghdr.cmsg_type = PK_FACILITIES;
+ m_adj (m, off);
+ M_PREPEND (m, sizeof (cmsghdr), M_DONTWAIT);
+ if (m == 0)
+ return;
+ bcopy ((caddr_t)&cmsghdr, mtod (m, caddr_t), sizeof (cmsghdr));
+ MCHTYPE(m, MT_CONTROL);
+ sbappendrecord (&so -> so_rcv, m);
+ }
+}
+
+/*
+ * This routine handles incoming call packets. It matches the protocol
+ * field on the Call User Data field (usually the first four bytes) with
+ * sockets awaiting connections.
+ */
+
+pk_incoming_call (pkp, m0)
+struct mbuf *m0;
+struct pkcb *pkp;
+{
+ register struct pklcd *lcp = 0, *l;
+ register struct sockaddr_x25 *sa;
+ register struct x25_calladdr *a;
+ register struct socket *so = 0;
+ struct x25_packet *xp = mtod (m0, struct x25_packet *);
+ struct mbuf *m;
+ struct x25config *xcp = pkp -> pk_xcp;
+ int len = m0 -> m_pkthdr.len;
+ unsigned udlen;
+ char *errstr = "server unavailable";
+ octet *u, *facp;
+ int lcn = LCN(xp);
+
+ /* First, copy the data from the incoming call packet to a X25 address
+ descriptor. It is to be regretted that you have
+ to parse the facilities into a sockaddr to determine
+ if reverse charging is being requested */
+ if ((m = m_get (M_DONTWAIT, MT_SONAME)) == 0)
+ return;
+ sa = mtod (m, struct sockaddr_x25 *);
+ a = (struct x25_calladdr *) &xp -> packet_data;
+ facp = u = (octet *) (a -> address_field +
+ ((X25GBITS(a -> addrlens, called_addrlen) + X25GBITS(a -> addrlens, calling_addrlen) + 1) / 2));
+ u += *u + 1;
+ udlen = min (16, ((octet *) xp) + len - u);
+ if (udlen < 0)
+ udlen = 0;
+ pk_from_bcd (a, 1, sa, pkp -> pk_xcp); /* get calling address */
+ pk_parse_facilities (facp, sa);
+ bcopy ((caddr_t) u, sa -> x25_udata, udlen);
+ sa -> x25_udlen = udlen;
+
+ /*
+ * Now, loop through the listen sockets looking for a match on the
+ * PID. That is the first few octets of the user data field.
+ * This is the closest thing to a port number for X.25 packets.
+ * It does provide a way of multiplexing services at the user level.
+ */
+
+ for (l = pk_listenhead; l; l = l -> lcd_listen) {
+ struct sockaddr_x25 *sxp = l -> lcd_ceaddr;
+
+ if (bcmp (sxp -> x25_udata, u, sxp -> x25_udlen))
+ continue;
+ if (sxp -> x25_net &&
+ sxp -> x25_net != xcp -> xc_addr.x25_net)
+ continue;
+ /*
+ * don't accept incoming calls with the D-Bit on
+ * unless the server agrees
+ */
+ if (X25GBITS(xp -> bits, d_bit) && !(sxp -> x25_opts.op_flags & X25_DBIT)) {
+ errstr = "incoming D-Bit mismatch";
+ break;
+ }
+ /*
+ * don't accept incoming collect calls unless
+ * the server sets the reverse charging option.
+ */
+ if ((sxp -> x25_opts.op_flags & (X25_OLDSOCKADDR|X25_REVERSE_CHARGE)) == 0 &&
+ sa -> x25_opts.op_flags & X25_REVERSE_CHARGE) {
+ errstr = "incoming collect call refused";
+ break;
+ }
+ if (l -> lcd_so) {
+ if (so = sonewconn (l -> lcd_so, SS_ISCONNECTED))
+ lcp = (struct pklcd *) so -> so_pcb;
+ } else
+ lcp = pk_attach ((struct socket *) 0);
+ if (lcp == 0) {
+ /*
+ * Insufficient space or too many unaccepted
+ * connections. Just throw the call away.
+ */
+ errstr = "server malfunction";
+ break;
+ }
+ lcp -> lcd_upper = l -> lcd_upper;
+ lcp -> lcd_upnext = l -> lcd_upnext;
+ lcp -> lcd_lcn = lcn;
+ lcp -> lcd_state = RECEIVED_CALL;
+ sa -> x25_opts.op_flags |= (sxp -> x25_opts.op_flags &
+ ~X25_REVERSE_CHARGE) | l -> lcd_flags;
+ pk_assoc (pkp, lcp, sa);
+ lcp -> lcd_faddr = *sa;
+ lcp -> lcd_laddr.x25_udlen = sxp -> x25_udlen;
+ lcp -> lcd_craddr = &lcp -> lcd_faddr;
+ lcp -> lcd_template = pk_template (lcp -> lcd_lcn, X25_CALL_ACCEPTED);
+ if (lcp -> lcd_flags & X25_DBIT) {
+ if (X25GBITS(xp -> bits, d_bit))
+ X25SBITS(mtod (lcp -> lcd_template,
+ struct x25_packet *) -> bits, d_bit, 1);
+ else
+ lcp -> lcd_flags &= ~X25_DBIT;
+ }
+ if (so) {
+ pk_output (lcp);
+ soisconnected (so);
+ if (so -> so_options & SO_OOBINLINE)
+ save_extra (m0, facp, so);
+ } else if (lcp -> lcd_upper) {
+ (*lcp -> lcd_upper) (lcp, m0);
+ }
+ (void) m_free (m);
+ return;
+ }
+
+ /*
+ * If the call fails for whatever reason, we still need to build a
+ * skeleton LCD in order to be able to properly receive the CLEAR
+ * CONFIRMATION.
+ */
+#ifdef WATERLOO /* be explicit */
+ if (l == 0 && bcmp (sa -> x25_udata, "ean", 3) == 0)
+ pk_message (lcn, pkp -> pk_xcp, "host=%s ean%c: %s",
+ sa -> x25_addr, sa -> x25_udata[3] & 0xff, errstr);
+ else if (l == 0 && bcmp (sa -> x25_udata, "\1\0\0\0", 4) == 0)
+ pk_message (lcn, pkp -> pk_xcp, "host=%s x29d: %s",
+ sa -> x25_addr, errstr);
+ else
+#endif
+ pk_message (lcn, pkp -> pk_xcp, "host=%s pid=%x %x %x %x: %s",
+ sa -> x25_addr, sa -> x25_udata[0] & 0xff,
+ sa -> x25_udata[1] & 0xff, sa -> x25_udata[2] & 0xff,
+ sa -> x25_udata[3] & 0xff, errstr);
+ if ((lcp = pk_attach ((struct socket *)0)) == 0) {
+ (void) m_free (m);
+ return;
+ }
+ lcp -> lcd_lcn = lcn;
+ lcp -> lcd_state = RECEIVED_CALL;
+ pk_assoc (pkp, lcp, sa);
+ (void) m_free (m);
+ pk_clear (lcp, 0, 1);
+}
+
+pk_call_accepted (lcp, m)
+struct pklcd *lcp;
+struct mbuf *m;
+{
+ register struct x25_calladdr *ap;
+ register octet *fcp;
+ struct x25_packet *xp = mtod (m, struct x25_packet *);
+ int len = m -> m_len;
+
+ lcp -> lcd_state = DATA_TRANSFER;
+ if (lcp -> lcd_so)
+ soisconnected (lcp -> lcd_so);
+ if ((lcp -> lcd_flags & X25_DBIT) && (X25GBITS(xp -> bits, d_bit) == 0))
+ lcp -> lcd_flags &= ~X25_DBIT;
+ if (len > 3) {
+ ap = (struct x25_calladdr *) &xp -> packet_data;
+ fcp = (octet *) ap -> address_field + (X25GBITS(ap -> addrlens, calling_addrlen) +
+ X25GBITS(ap -> addrlens, called_addrlen) + 1) / 2;
+ if (fcp + *fcp <= ((octet *) xp) + len)
+ pk_parse_facilities (fcp, lcp -> lcd_ceaddr);
+ }
+ pk_assoc (lcp -> lcd_pkp, lcp, lcp -> lcd_ceaddr);
+ if (lcp -> lcd_so == 0 && lcp -> lcd_upper)
+ lcp -> lcd_upper (lcp, m);
+}
+
+pk_parse_facilities (fcp, sa)
+register octet *fcp;
+register struct sockaddr_x25 *sa;
+{
+ register octet *maxfcp;
+
+ maxfcp = fcp + *fcp;
+ fcp++;
+ while (fcp < maxfcp) {
+ /*
+ * Ignore national DCE or DTE facilities
+ */
+ if (*fcp == 0 || *fcp == 0xff)
+ break;
+ switch (*fcp) {
+ case FACILITIES_WINDOWSIZE:
+ sa -> x25_opts.op_wsize = fcp[1];
+ fcp += 3;
+ break;
+
+ case FACILITIES_PACKETSIZE:
+ sa -> x25_opts.op_psize = fcp[1];
+ fcp += 3;
+ break;
+
+ case FACILITIES_THROUGHPUT:
+ sa -> x25_opts.op_speed = fcp[1];
+ fcp += 2;
+ break;
+
+ case FACILITIES_REVERSE_CHARGE:
+ if (fcp[1] & 01)
+ sa -> x25_opts.op_flags |= X25_REVERSE_CHARGE;
+ /*
+ * Datapac specific: for a X.25(1976) DTE, bit 2
+ * indicates a "hi priority" (eg. international) call.
+ */
+ if (fcp[1] & 02 && sa -> x25_opts.op_psize == 0)
+ sa -> x25_opts.op_psize = X25_PS128;
+ fcp += 2;
+ break;
+
+ default:
+/*printf("unknown facility %x, class=%d\n", *fcp, (*fcp & 0xc0) >> 6);*/
+ switch ((*fcp & 0xc0) >> 6) {
+ case 0: /* class A */
+ fcp += 2;
+ break;
+
+ case 1:
+ fcp += 3;
+ break;
+
+ case 2:
+ fcp += 4;
+ break;
+
+ case 3:
+ fcp++;
+ fcp += *fcp;
+ }
+ }
+ }
+}