218 lines
6.2 KiB
C
218 lines
6.2 KiB
C
/*
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* Copyright (c) University of British Columbia, 1984
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* Copyright (C) Computer Science Department IV,
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* University of Erlangen-Nuremberg, Germany, 1992
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* Copyright (c) 1991, 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by the
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* Laboratory for Computation Vision and the Computer Science Department
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* of the the University of British Columbia and the Computer Science
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* Department (IV) of the University of Erlangen-Nuremberg, Germany.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)pk_output.c 8.1 (Berkeley) 6/10/93
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* $Id: pk_output.c,v 1.2 1994/08/02 07:47:38 davidg Exp $
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/protosw.h>
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#include <sys/errno.h>
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#include <net/if.h>
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#include <netccitt/x25.h>
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#include <netccitt/pk.h>
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#include <netccitt/pk_var.h>
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struct mbuf_cache pk_output_cache = {0 }, pk_input_cache;
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struct mbuf *nextpk ();
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pk_output (lcp)
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register struct pklcd *lcp;
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{
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register struct x25_packet *xp;
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register struct mbuf *m;
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register struct pkcb *pkp = lcp -> lcd_pkp;
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if (lcp == 0 || pkp == 0) {
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printf ("pk_output: zero arg\n");
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return;
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}
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while ((m = nextpk (lcp)) != NULL) {
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xp = mtod (m, struct x25_packet *);
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switch (pk_decode (xp) + lcp -> lcd_state) {
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/*
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* All the work is already done - just set the state and
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* pass to peer.
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*/
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case CALL + READY:
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lcp -> lcd_state = SENT_CALL;
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lcp -> lcd_timer = pk_t21;
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break;
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/*
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* Just set the state to allow packet to flow and send the
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* confirmation.
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*/
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case CALL_ACCEPTED + RECEIVED_CALL:
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lcp -> lcd_state = DATA_TRANSFER;
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break;
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/*
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* Just set the state. Keep the LCD around till the clear
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* confirmation is returned.
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*/
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case CLEAR + RECEIVED_CALL:
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case CLEAR + SENT_CALL:
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case CLEAR + DATA_TRANSFER:
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lcp -> lcd_state = SENT_CLEAR;
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lcp -> lcd_retry = 0;
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/* fall through */
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case CLEAR + SENT_CLEAR:
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lcp -> lcd_timer = pk_t23;
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lcp -> lcd_retry++;
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break;
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case CLEAR_CONF + RECEIVED_CLEAR:
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case CLEAR_CONF + SENT_CLEAR:
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case CLEAR_CONF + READY:
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lcp -> lcd_state = READY;
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break;
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case DATA + DATA_TRANSFER:
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SPS(xp, lcp -> lcd_ssn);
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lcp -> lcd_input_window =
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(lcp -> lcd_rsn + 1) % MODULUS;
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SPR(xp, lcp -> lcd_input_window);
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lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window;
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lcp -> lcd_ssn = (lcp -> lcd_ssn + 1) % MODULUS;
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if (lcp -> lcd_ssn == ((lcp -> lcd_output_window + lcp -> lcd_windowsize) % MODULUS))
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lcp -> lcd_window_condition = TRUE;
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break;
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case INTERRUPT + DATA_TRANSFER:
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#ifdef ancient_history
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xp -> packet_data = 0;
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#endif
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lcp -> lcd_intrconf_pending = TRUE;
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break;
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case INTERRUPT_CONF + DATA_TRANSFER:
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break;
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case RR + DATA_TRANSFER:
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case RNR + DATA_TRANSFER:
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lcp -> lcd_input_window =
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(lcp -> lcd_rsn + 1) % MODULUS;
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SPR(xp, lcp -> lcd_input_window);
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lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window;
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break;
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case RESET + DATA_TRANSFER:
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lcp -> lcd_reset_condition = TRUE;
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break;
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case RESET_CONF + DATA_TRANSFER:
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lcp -> lcd_reset_condition = FALSE;
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break;
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/*
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* A restart should be only generated internally. Therefore
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* all logic for restart is in the pk_restart routine.
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*/
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case RESTART + READY:
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lcp -> lcd_timer = pk_t20;
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break;
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/*
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* Restarts are all handled internally. Therefore all the
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* logic for the incoming restart packet is handled in the
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* pk_input routine.
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*/
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case RESTART_CONF + READY:
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break;
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default:
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m_freem (m);
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return;
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}
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/* Trace the packet. */
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pk_trace (pkp -> pk_xcp, m, "P-Out");
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/* Pass the packet on down to the link layer */
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if (pk_input_cache.mbc_size || pk_input_cache.mbc_oldsize) {
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m->m_flags |= 0x08;
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mbuf_cache(&pk_input_cache, m);
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}
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(*pkp -> pk_lloutput) (pkp -> pk_llnext, m, pkp -> pk_rt);
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}
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}
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/*
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* This procedure returns the next packet to send or null. A
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* packet is composed of one or more mbufs.
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*/
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struct mbuf *
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nextpk (lcp)
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struct pklcd *lcp;
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{
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register struct mbuf *m, *n;
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struct socket *so = lcp -> lcd_so;
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register struct sockbuf *sb = & (so ? so -> so_snd : lcp -> lcd_sb);
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if (lcp -> lcd_template) {
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m = lcp -> lcd_template;
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lcp -> lcd_template = NULL;
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} else {
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if (lcp -> lcd_rnr_condition || lcp -> lcd_window_condition ||
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lcp -> lcd_reset_condition)
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return (NULL);
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if ((m = sb -> sb_mb) == 0)
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return (NULL);
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sb -> sb_mb = m -> m_nextpkt;
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m->m_act = 0;
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for (n = m; n; n = n -> m_next)
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sbfree (sb, n);
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}
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return (m);
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}
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