initial import of NetBSD tree

1 files changed, 218 insertions, 0 deletions

diff --git a/sys/netccitt/pk_output.c b/sys/netccitt/pk_output.c
new file mode 100644
index 00000000000..9bc91325fec
--- /dev/null
+++ b/sys/netccitt/pk_output.c
@@ -0,0 +1,218 @@
+/*	$NetBSD: pk_output.c,v 1.6 1994/09/20 06:41:04 cgd Exp $	*/
+
+/*
+ * 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_output.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/socketvar.h>
+#include <sys/protosw.h>
+#include <sys/errno.h>
+
+#include <net/if.h>
+
+#include <netccitt/x25.h>
+#include <netccitt/pk.h>
+#include <netccitt/pk_var.h>
+
+struct mbuf_cache pk_output_cache = {0 }, pk_input_cache;
+struct	mbuf *nextpk ();
+
+pk_output (lcp)
+register struct pklcd *lcp;
+{
+	register struct x25_packet *xp;
+	register struct mbuf *m;
+	register struct pkcb *pkp = lcp -> lcd_pkp;
+
+	if (lcp == 0 || pkp == 0) {
+		printf ("pk_output: zero arg\n");
+		return;
+	}
+
+	while ((m = nextpk (lcp)) != NULL) {
+		xp = mtod (m, struct x25_packet *);
+
+		switch (pk_decode (xp) + lcp -> lcd_state) {
+		/* 
+		 *  All the work is already done - just set the state and
+		 *  pass to peer.
+		 */
+		case CALL + READY: 
+			lcp -> lcd_state = SENT_CALL;
+			lcp -> lcd_timer = pk_t21;
+			break;
+
+		/*
+		 *  Just set the state to allow packet to flow and send the
+		 *  confirmation.
+		 */
+		case CALL_ACCEPTED + RECEIVED_CALL: 
+			lcp -> lcd_state = DATA_TRANSFER;
+			break;
+
+		/* 
+		 *  Just set the state. Keep the LCD around till the clear
+		 *  confirmation is returned.
+		 */
+		case CLEAR + RECEIVED_CALL: 
+		case CLEAR + SENT_CALL: 
+		case CLEAR + DATA_TRANSFER: 
+			lcp -> lcd_state = SENT_CLEAR;
+			lcp -> lcd_retry = 0;
+			/* fall through */
+
+		case CLEAR + SENT_CLEAR:
+			lcp -> lcd_timer = pk_t23;
+			lcp -> lcd_retry++;
+			break;
+
+		case CLEAR_CONF + RECEIVED_CLEAR: 
+		case CLEAR_CONF + SENT_CLEAR: 
+		case CLEAR_CONF + READY: 
+			lcp -> lcd_state = READY;
+			break;
+
+		case DATA + DATA_TRANSFER: 
+			SPS(xp, lcp -> lcd_ssn);
+			lcp -> lcd_input_window =
+				(lcp -> lcd_rsn + 1) % MODULUS;
+			SPR(xp, lcp -> lcd_input_window);
+			lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window;
+			lcp -> lcd_ssn = (lcp -> lcd_ssn + 1) % MODULUS;
+			if (lcp -> lcd_ssn == ((lcp -> lcd_output_window + lcp -> lcd_windowsize) % MODULUS))
+				lcp -> lcd_window_condition = TRUE;
+			break;
+
+		case INTERRUPT + DATA_TRANSFER: 
+#ifdef ancient_history
+			xp -> packet_data = 0;
+#endif
+			lcp -> lcd_intrconf_pending = TRUE;
+			break;
+
+		case INTERRUPT_CONF + DATA_TRANSFER: 
+			break;
+
+		case RR + DATA_TRANSFER: 
+		case RNR + DATA_TRANSFER: 
+			lcp -> lcd_input_window =
+				(lcp -> lcd_rsn + 1) % MODULUS;
+			SPR(xp, lcp -> lcd_input_window);
+			lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window;
+			break;
+
+		case RESET + DATA_TRANSFER: 
+			lcp -> lcd_reset_condition = TRUE;
+			break;
+
+		case RESET_CONF + DATA_TRANSFER: 
+			lcp -> lcd_reset_condition = FALSE;
+			break;
+
+		/* 
+		 *  A restart should be only generated internally. Therefore
+		 *  all logic for restart is in the pk_restart routine.
+		 */
+		case RESTART + READY: 
+			lcp -> lcd_timer = pk_t20;
+			break;
+
+		/* 
+		 *  Restarts are all  handled internally.  Therefore all the
+		 *  logic for the incoming restart packet is handled in  the
+		 *  pk_input routine.
+		 */
+		case RESTART_CONF + READY: 
+			break;
+
+		default: 
+			m_freem (m);
+			return;
+		}
+
+		/* Trace the packet. */
+		pk_trace (pkp -> pk_xcp, m, "P-Out");
+
+		/* Pass the packet on down to the link layer */
+		if (pk_input_cache.mbc_size || pk_input_cache.mbc_oldsize) {
+			m->m_flags |= 0x08;
+			mbuf_cache(&pk_input_cache, m);
+		}
+		(*pkp -> pk_lloutput) (pkp -> pk_llnext, m, pkp -> pk_rt);
+	}
+}
+
+/* 
+ *  This procedure returns the next packet to send or null. A
+ *  packet is composed of one or more mbufs.
+ */
+
+struct mbuf *
+nextpk (lcp)
+struct pklcd *lcp;
+{
+	register struct mbuf *m, *n;
+	struct socket *so = lcp -> lcd_so;
+	register struct sockbuf *sb = (so ? &so->so_snd : &lcp->lcd_sb);
+
+	if (lcp -> lcd_template) {
+		m = lcp -> lcd_template;
+		lcp -> lcd_template = NULL;
+	} else {
+		if (lcp -> lcd_rnr_condition || lcp -> lcd_window_condition ||
+				lcp -> lcd_reset_condition)
+			return (NULL);
+
+		if ((m = sb -> sb_mb) == 0)
+			return (NULL);
+
+ 		sb -> sb_mb = m -> m_nextpkt;
+ 		m->m_act = 0;
+		for (n = m; n; n = n -> m_next)
+			sbfree (sb, n);
+	}
+	return (m);
+}