pk_output.c

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    1 /*      $NetBSD: pk_output.c,v 1.19 2003/08/07 16:33:04 agc Exp $       */
    2 
    3 /*
    4  * Copyright (c) 1991, 1992, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * This code is derived from software contributed to Berkeley by the
    8  * Laboratory for Computation Vision and the Computer Science Department
    9  * of the University of British Columbia and the Computer Science
   10  * Department (IV) of the University of Erlangen-Nuremberg, Germany.
   11  *
   12  * Redistribution and use in source and binary forms, with or without
   13  * modification, are permitted provided that the following conditions
   14  * are met:
   15  * 1. Redistributions of source code must retain the above copyright
   16  *    notice, this list of conditions and the following disclaimer.
   17  * 2. Redistributions in binary form must reproduce the above copyright
   18  *    notice, this list of conditions and the following disclaimer in the
   19  *    documentation and/or other materials provided with the distribution.
   20  * 3. Neither the name of the University nor the names of its contributors
   21  *    may be used to endorse or promote products derived from this software
   22  *    without specific prior written permission.
   23  *
   24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   34  * SUCH DAMAGE.
   35  *
   36  *      @(#)pk_output.c 8.2(Berkeley) 9/22/94
   37  */
   38 
   39 /*
   40  * Copyright (c) 1984 University of British Columbia.
   41  * Copyright (c) 1992 Computer Science Department IV,
   42  *              University of Erlangen-Nuremberg, Germany.
   43  *
   44  * This code is derived from software contributed to Berkeley by the
   45  * Laboratory for Computation Vision and the Computer Science Department
   46  * of the University of British Columbia and the Computer Science
   47  * Department (IV) of the University of Erlangen-Nuremberg, Germany.
   48  *
   49  * Redistribution and use in source and binary forms, with or without
   50  * modification, are permitted provided that the following conditions
   51  * are met:
   52  * 1. Redistributions of source code must retain the above copyright
   53  *    notice, this list of conditions and the following disclaimer.
   54  * 2. Redistributions in binary form must reproduce the above copyright
   55  *    notice, this list of conditions and the following disclaimer in the
   56  *    documentation and/or other materials provided with the distribution.
   57  * 3. All advertising materials mentioning features or use of this software
   58  *    must display the following acknowledgement:
   59  *      This product includes software developed by the University of
   60  *      California, Berkeley and its contributors.
   61  * 4. Neither the name of the University nor the names of its contributors
   62  *    may be used to endorse or promote products derived from this software
   63  *    without specific prior written permission.
   64  *
   65  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   66  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   67  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   68  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   69  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   70  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   71  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   72  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   73  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   74  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   75  * SUCH DAMAGE.
   76  *
   77  *      @(#)pk_output.c 8.2(Berkeley) 9/22/94
   78  */
   79 
   80 #include <sys/cdefs.h>
   81 __KERNEL_RCSID(0, "$NetBSD: pk_output.c,v 1.19 2003/08/07 16:33:04 agc Exp $");
   82 
   83 #include <sys/param.h>
   84 #include <sys/systm.h>
   85 #include <sys/mbuf.h>
   86 #include <sys/socket.h>
   87 #include <sys/socketvar.h>
   88 #include <sys/protosw.h>
   89 #include <sys/errno.h>
   90 
   91 #include <net/if.h>
   92 
   93 #include <netccitt/x25.h>
   94 #include <netccitt/pk.h>
   95 #include <netccitt/pk_var.h>
   96 #include <netccitt/pk_extern.h>
   97 
   98 struct mbuf_cache pk_output_cache = {0};
   99 
  100 void
  101 pk_output(lcp)
  102         struct pklcd *lcp;
  103 {
  104         struct x25_packet *xp;
  105         struct mbuf *m;
  106         struct pkcb *pkp = lcp->lcd_pkp;
  107 
  108         if (lcp == 0 || pkp == 0) {
  109                 printf("pk_output: zero arg\n");
  110                 return;
  111         }
  112         while ((m = nextpk(lcp)) != NULL) {
  113                 xp = mtod(m, struct x25_packet *);
  114 
  115                 switch (pk_decode(xp) + lcp->lcd_state) {
  116                         /*
  117                          * All the work is already done - just set the state
  118                          * and pass to peer.
  119                          */
  120                 case PK_CALL + READY:
  121                         lcp->lcd_state = SENT_CALL;
  122                         lcp->lcd_timer = pk_t21;
  123                         break;
  124 
  125                         /*
  126                          *  Just set the state to allow packet to flow and send the
  127                          *  confirmation.
  128                          */
  129                 case PK_CALL_ACCEPTED + RECEIVED_CALL:
  130                         lcp->lcd_state = DATA_TRANSFER;
  131                         break;
  132 
  133                         /*
  134                          * Just set the state. Keep the LCD around till the
  135                          * clear confirmation is returned.
  136                          */
  137                 case PK_CLEAR + RECEIVED_CALL:
  138                 case PK_CLEAR + SENT_CALL:
  139                 case PK_CLEAR + DATA_TRANSFER:
  140                         lcp->lcd_state = SENT_CLEAR;
  141                         lcp->lcd_retry = 0;
  142                         /* fall through */
  143 
  144                 case PK_CLEAR + SENT_CLEAR:
  145                         lcp->lcd_timer = pk_t23;
  146                         lcp->lcd_retry++;
  147                         break;
  148 
  149                 case PK_CLEAR_CONF + RECEIVED_CLEAR:
  150                 case PK_CLEAR_CONF + SENT_CLEAR:
  151                 case PK_CLEAR_CONF + READY:
  152                         lcp->lcd_state = READY;
  153                         break;
  154 
  155                 case PK_DATA + DATA_TRANSFER:
  156                         SPS(xp, lcp->lcd_ssn);
  157                         lcp->lcd_input_window =
  158                                 (lcp->lcd_rsn + 1) % MODULUS;
  159                         SPR(xp, lcp->lcd_input_window);
  160                         lcp->lcd_last_transmitted_pr = lcp->lcd_input_window;
  161                         lcp->lcd_ssn = (lcp->lcd_ssn + 1) % MODULUS;
  162                         if (lcp->lcd_ssn == ((lcp->lcd_output_window + lcp->lcd_windowsize) % MODULUS))
  163                                 lcp->lcd_window_condition = TRUE;
  164                         break;
  165 
  166                 case PK_INTERRUPT + DATA_TRANSFER:
  167 #ifdef ancient_history
  168                         xp->packet_data = 0;
  169 #endif
  170                         lcp->lcd_intrconf_pending = TRUE;
  171                         break;
  172 
  173                 case PK_INTERRUPT_CONF + DATA_TRANSFER:
  174                         break;
  175 
  176                 case PK_RR + DATA_TRANSFER:
  177                 case PK_RNR + DATA_TRANSFER:
  178                         lcp->lcd_input_window =
  179                                 (lcp->lcd_rsn + 1) % MODULUS;
  180                         SPR(xp, lcp->lcd_input_window);
  181                         lcp->lcd_last_transmitted_pr = lcp->lcd_input_window;
  182                         break;
  183 
  184                 case PK_RESET + DATA_TRANSFER:
  185                         lcp->lcd_reset_condition = TRUE;
  186                         break;
  187 
  188                 case PK_RESET_CONF + DATA_TRANSFER:
  189                         lcp->lcd_reset_condition = FALSE;
  190                         break;
  191 
  192                         /*
  193                          * A restart should be only generated internally.
  194                          * Therefore all logic for restart is in the
  195                          * pk_restart routine.
  196                          */
  197                 case PK_RESTART + READY:
  198                         lcp->lcd_timer = pk_t20;
  199                         break;
  200 
  201                         /*
  202                          * Restarts are all  handled internally.  Therefore
  203                          * all the logic for the incoming restart packet is
  204                          * handled in  the pk_input routine.
  205                          */
  206                 case PK_RESTART_CONF + READY:
  207                         break;
  208 
  209                 default:
  210                         m_freem(m);
  211                         return;
  212                 }
  213 
  214                 /* Trace the packet. */
  215                 pk_trace(pkp->pk_xcp, m, "P-Out");
  216 
  217                 /* Pass the packet on down to the link layer */
  218                 if (pk_input_cache.mbc_size || pk_input_cache.mbc_oldsize) {
  219                         m->m_flags |= 0x08;
  220                         mbuf_cache(&pk_input_cache, m);
  221                 }
  222                 (*pkp->pk_lloutput) (m, pkp->pk_llnext, pkp->pk_rt);
  223         }
  224 }
  225 
  226 /*
  227  * This procedure returns the next packet to send or null. A packet is
  228  * composed of one or more mbufs.
  229  */
  230 
  231 struct mbuf *
  232 nextpk(lcp)
  233         struct pklcd   *lcp;
  234 {
  235         struct mbuf *m, *n;
  236         struct socket  *so = lcp->lcd_so;
  237         struct sockbuf *sb = (so ? &so->so_snd : &lcp->lcd_sb);
  238 
  239         if (lcp->lcd_template) {
  240                 m = lcp->lcd_template;
  241                 lcp->lcd_template = NULL;
  242         } else {
  243                 if (lcp->lcd_rnr_condition || lcp->lcd_window_condition ||
  244                     lcp->lcd_reset_condition)
  245                         return (NULL);
  246 
  247                 if ((m = sb->sb_mb) == 0)
  248                         return (NULL);
  249 
  250                 sb->sb_mb = m->m_nextpkt;
  251                 SB_EMPTY_FIXUP(sb);
  252                 m->m_nextpkt = 0;
  253                 for (n = m; n; n = n->m_next)
  254                         sbfree(sb, n);
  255         }
  256         return (m);
  257 }
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FreeBSD/Linux Kernel Cross Reference sys/netccitt/pk_output.c

FreeBSD/Linux Kernel Cross Reference
sys/netccitt/pk_output.c
