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Annotation of kernel/bsd/netccitt/pk_output.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
        !             3:  *
        !             4:  * @APPLE_LICENSE_HEADER_START@
        !             5:  * 
        !             6:  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
        !             7:  * Reserved.  This file contains Original Code and/or Modifications of
        !             8:  * Original Code as defined in and that are subject to the Apple Public
        !             9:  * Source License Version 1.1 (the "License").  You may not use this file
        !            10:  * except in compliance with the License.  Please obtain a copy of the
        !            11:  * License at http://www.apple.com/publicsource and read it before using
        !            12:  * this file.
        !            13:  * 
        !            14:  * The Original Code and all software distributed under the License are
        !            15:  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
        !            16:  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
        !            17:  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
        !            18:  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
        !            19:  * License for the specific language governing rights and limitations
        !            20:  * under the License.
        !            21:  * 
        !            22:  * @APPLE_LICENSE_HEADER_END@
        !            23:  */
        !            24: 
        !            25: /*
        !            26:  * Copyright (c) University of British Columbia, 1984
        !            27:  * Copyright (C) Computer Science Department IV, 
        !            28:  *              University of Erlangen-Nuremberg, Germany, 1992
        !            29:  * Copyright (c) 1991, 1992, 1993
        !            30:  *     The Regents of the University of California.  All rights reserved.
        !            31:  *
        !            32:  * This code is derived from software contributed to Berkeley by the
        !            33:  * Laboratory for Computation Vision and the Computer Science Department
        !            34:  * of the the University of British Columbia and the Computer Science
        !            35:  * Department (IV) of the University of Erlangen-Nuremberg, Germany.
        !            36:  *
        !            37:  * Redistribution and use in source and binary forms, with or without
        !            38:  * modification, are permitted provided that the following conditions
        !            39:  * are met:
        !            40:  * 1. Redistributions of source code must retain the above copyright
        !            41:  *    notice, this list of conditions and the following disclaimer.
        !            42:  * 2. Redistributions in binary form must reproduce the above copyright
        !            43:  *    notice, this list of conditions and the following disclaimer in the
        !            44:  *    documentation and/or other materials provided with the distribution.
        !            45:  * 3. All advertising materials mentioning features or use of this software
        !            46:  *    must display the following acknowledgement:
        !            47:  *     This product includes software developed by the University of
        !            48:  *     California, Berkeley and its contributors.
        !            49:  * 4. Neither the name of the University nor the names of its contributors
        !            50:  *    may be used to endorse or promote products derived from this software
        !            51:  *    without specific prior written permission.
        !            52:  *
        !            53:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            54:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            55:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            56:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            57:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            58:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            59:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            60:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            61:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            62:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            63:  * SUCH DAMAGE.
        !            64:  *
        !            65:  *     @(#)pk_output.c 8.1 (Berkeley) 6/10/93
        !            66:  */
        !            67: 
        !            68: #include <sys/param.h>
        !            69: #include <sys/systm.h>
        !            70: #include <sys/mbuf.h>
        !            71: #include <sys/socket.h>
        !            72: #include <sys/socketvar.h>
        !            73: #include <sys/protosw.h>
        !            74: #include <sys/errno.h>
        !            75: 
        !            76: #include <net/if.h>
        !            77: 
        !            78: #include <netccitt/x25.h>
        !            79: #include <netccitt/pk.h>
        !            80: #include <netccitt/pk_var.h>
        !            81: 
        !            82: struct mbuf_cache pk_output_cache = {0 }, pk_input_cache;
        !            83: struct mbuf *nextpk ();
        !            84: 
        !            85: pk_output (lcp)
        !            86: register struct pklcd *lcp;
        !            87: {
        !            88:        register struct x25_packet *xp;
        !            89:        register struct mbuf *m;
        !            90:        register struct pkcb *pkp = lcp -> lcd_pkp;
        !            91: 
        !            92:        if (lcp == 0 || pkp == 0) {
        !            93:                printf ("pk_output: zero arg\n");
        !            94:                return;
        !            95:        }
        !            96: 
        !            97:        while ((m = nextpk (lcp)) != NULL) {
        !            98:                xp = mtod (m, struct x25_packet *);
        !            99: 
        !           100:                switch (pk_decode (xp) + lcp -> lcd_state) {
        !           101:                /* 
        !           102:                 *  All the work is already done - just set the state and
        !           103:                 *  pass to peer.
        !           104:                 */
        !           105:                case CALL + READY: 
        !           106:                        lcp -> lcd_state = SENT_CALL;
        !           107:                        lcp -> lcd_timer = pk_t21;
        !           108:                        break;
        !           109: 
        !           110:                /*
        !           111:                 *  Just set the state to allow packet to flow and send the
        !           112:                 *  confirmation.
        !           113:                 */
        !           114:                case CALL_ACCEPTED + RECEIVED_CALL: 
        !           115:                        lcp -> lcd_state = DATA_TRANSFER;
        !           116:                        break;
        !           117: 
        !           118:                /* 
        !           119:                 *  Just set the state. Keep the LCD around till the clear
        !           120:                 *  confirmation is returned.
        !           121:                 */
        !           122:                case CLEAR + RECEIVED_CALL: 
        !           123:                case CLEAR + SENT_CALL: 
        !           124:                case CLEAR + DATA_TRANSFER: 
        !           125:                        lcp -> lcd_state = SENT_CLEAR;
        !           126:                        lcp -> lcd_retry = 0;
        !           127:                        /* fall through */
        !           128: 
        !           129:                case CLEAR + SENT_CLEAR:
        !           130:                        lcp -> lcd_timer = pk_t23;
        !           131:                        lcp -> lcd_retry++;
        !           132:                        break;
        !           133: 
        !           134:                case CLEAR_CONF + RECEIVED_CLEAR: 
        !           135:                case CLEAR_CONF + SENT_CLEAR: 
        !           136:                case CLEAR_CONF + READY: 
        !           137:                        lcp -> lcd_state = READY;
        !           138:                        break;
        !           139: 
        !           140:                case DATA + DATA_TRANSFER: 
        !           141:                        SPS(xp, lcp -> lcd_ssn);
        !           142:                        lcp -> lcd_input_window =
        !           143:                                (lcp -> lcd_rsn + 1) % MODULUS;
        !           144:                        SPR(xp, lcp -> lcd_input_window);
        !           145:                        lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window;
        !           146:                        lcp -> lcd_ssn = (lcp -> lcd_ssn + 1) % MODULUS;
        !           147:                        if (lcp -> lcd_ssn == ((lcp -> lcd_output_window + lcp -> lcd_windowsize) % MODULUS))
        !           148:                                lcp -> lcd_window_condition = TRUE;
        !           149:                        break;
        !           150: 
        !           151:                case INTERRUPT + DATA_TRANSFER: 
        !           152: #ifdef ancient_history
        !           153:                        xp -> packet_data = 0;
        !           154: #endif
        !           155:                        lcp -> lcd_intrconf_pending = TRUE;
        !           156:                        break;
        !           157: 
        !           158:                case INTERRUPT_CONF + DATA_TRANSFER: 
        !           159:                        break;
        !           160: 
        !           161:                case RR + DATA_TRANSFER: 
        !           162:                case RNR + DATA_TRANSFER: 
        !           163:                        lcp -> lcd_input_window =
        !           164:                                (lcp -> lcd_rsn + 1) % MODULUS;
        !           165:                        SPR(xp, lcp -> lcd_input_window);
        !           166:                        lcp -> lcd_last_transmitted_pr = lcp -> lcd_input_window;
        !           167:                        break;
        !           168: 
        !           169:                case RESET + DATA_TRANSFER: 
        !           170:                        lcp -> lcd_reset_condition = TRUE;
        !           171:                        break;
        !           172: 
        !           173:                case RESET_CONF + DATA_TRANSFER: 
        !           174:                        lcp -> lcd_reset_condition = FALSE;
        !           175:                        break;
        !           176: 
        !           177:                /* 
        !           178:                 *  A restart should be only generated internally. Therefore
        !           179:                 *  all logic for restart is in the pk_restart routine.
        !           180:                 */
        !           181:                case RESTART + READY: 
        !           182:                        lcp -> lcd_timer = pk_t20;
        !           183:                        break;
        !           184: 
        !           185:                /* 
        !           186:                 *  Restarts are all  handled internally.  Therefore all the
        !           187:                 *  logic for the incoming restart packet is handled in  the
        !           188:                 *  pk_input routine.
        !           189:                 */
        !           190:                case RESTART_CONF + READY: 
        !           191:                        break;
        !           192: 
        !           193:                default: 
        !           194:                        m_freem (m);
        !           195:                        return;
        !           196:                }
        !           197: 
        !           198:                /* Trace the packet. */
        !           199:                pk_trace (pkp -> pk_xcp, m, "P-Out");
        !           200: 
        !           201:                /* Pass the packet on down to the link layer */
        !           202:                if (pk_input_cache.mbc_size || pk_input_cache.mbc_oldsize) {
        !           203:                        m->m_flags |= 0x08;
        !           204:                        mbuf_cache(&pk_input_cache, m);
        !           205:                }
        !           206:                (*pkp -> pk_lloutput) (pkp -> pk_llnext, m, pkp -> pk_rt);
        !           207:        }
        !           208: }
        !           209: 
        !           210: /* 
        !           211:  *  This procedure returns the next packet to send or null. A
        !           212:  *  packet is composed of one or more mbufs.
        !           213:  */
        !           214: 
        !           215: struct mbuf *
        !           216: nextpk (lcp)
        !           217: struct pklcd *lcp;
        !           218: {
        !           219:        register struct mbuf *m, *n;
        !           220:        struct socket *so = lcp -> lcd_so;
        !           221:        register struct sockbuf *sb = & (so ? so -> so_snd : lcp -> lcd_sb);
        !           222: 
        !           223:        if (lcp -> lcd_template) {
        !           224:                m = lcp -> lcd_template;
        !           225:                lcp -> lcd_template = NULL;
        !           226:        } else {
        !           227:                if (lcp -> lcd_rnr_condition || lcp -> lcd_window_condition ||
        !           228:                                lcp -> lcd_reset_condition)
        !           229:                        return (NULL);
        !           230: 
        !           231:                if ((m = sb -> sb_mb) == 0)
        !           232:                        return (NULL);
        !           233: 
        !           234:                sb -> sb_mb = m -> m_nextpkt;
        !           235:                m->m_act = 0;
        !           236:                for (n = m; n; n = n -> m_next)
        !           237:                        sbfree (sb, n);
        !           238:        }
        !           239:        return (m);
        !           240: }

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