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Annotation of Net2/netiso/clnp_timer.c, revision 1.1

1.1     ! root        1: /*-
        !             2:  * Copyright (c) 1991 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  *
        !            33:  *     @(#)clnp_timer.c        7.5 (Berkeley) 5/6/91
        !            34:  */
        !            35: 
        !            36: /***********************************************************
        !            37:                Copyright IBM Corporation 1987
        !            38: 
        !            39:                       All Rights Reserved
        !            40: 
        !            41: Permission to use, copy, modify, and distribute this software and its 
        !            42: documentation for any purpose and without fee is hereby granted, 
        !            43: provided that the above copyright notice appear in all copies and that
        !            44: both that copyright notice and this permission notice appear in 
        !            45: supporting documentation, and that the name of IBM not be
        !            46: used in advertising or publicity pertaining to distribution of the
        !            47: software without specific, written prior permission.  
        !            48: 
        !            49: IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
        !            50: ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
        !            51: IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
        !            52: ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
        !            53: WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
        !            54: ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
        !            55: SOFTWARE.
        !            56: 
        !            57: ******************************************************************/
        !            58: 
        !            59: /*
        !            60:  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
        !            61:  */
        !            62: /* $Header: clnp_timer.c,v 4.2 88/06/29 14:59:05 hagens Exp $ */
        !            63: /* $Source: /usr/argo/sys/netiso/RCS/clnp_timer.c,v $ */
        !            64: 
        !            65: #include "param.h"
        !            66: #include "mbuf.h"
        !            67: #include "domain.h"
        !            68: #include "protosw.h"
        !            69: #include "socket.h"
        !            70: #include "socketvar.h"
        !            71: #include "errno.h"
        !            72: 
        !            73: #include "../net/if.h"
        !            74: #include "../net/route.h"
        !            75: 
        !            76: #include "iso.h"
        !            77: #include "clnp.h"
        !            78: #include "clnp_stat.h"
        !            79: #include "argo_debug.h"
        !            80: 
        !            81: extern struct clnp_fragl *clnp_frags;
        !            82: 
        !            83: /*
        !            84:  * FUNCTION:           clnp_freefrags
        !            85:  *
        !            86:  * PURPOSE:                    Free the resources associated with a fragment
        !            87:  *
        !            88:  * RETURNS:                    pointer to next fragment in list of fragments
        !            89:  *
        !            90:  * SIDE EFFECTS:       
        !            91:  *
        !            92:  * NOTES:                      
        !            93:  *                     TODO: send ER back to source
        !            94:  */
        !            95: struct clnp_fragl *
        !            96: clnp_freefrags(cfh)
        !            97: register struct clnp_fragl     *cfh;   /* fragment header to delete */
        !            98: {
        !            99:        struct clnp_fragl       *next = cfh->cfl_next;
        !           100:        struct clnp_frag        *cf;
        !           101: 
        !           102:        /* free any frags hanging around */
        !           103:        cf = cfh->cfl_frags;
        !           104:        while (cf != NULL) {
        !           105:                struct clnp_frag        *cf_next = cf->cfr_next;
        !           106:                INCSTAT(cns_fragdropped);
        !           107:                m_freem(cf->cfr_data);
        !           108:                cf = cf_next;
        !           109:        }
        !           110: 
        !           111:        /* free the copy of the header */
        !           112:        INCSTAT(cns_fragdropped);
        !           113:        m_freem(cfh->cfl_orighdr);
        !           114: 
        !           115:        if (clnp_frags == cfh) {
        !           116:                clnp_frags = cfh->cfl_next;
        !           117:        } else {
        !           118:                struct clnp_fragl       *scan;
        !           119: 
        !           120:                for (scan = clnp_frags; scan != NULL; scan = scan->cfl_next) {
        !           121:                        if (scan->cfl_next == cfh) {
        !           122:                                scan->cfl_next = cfh->cfl_next;
        !           123:                                break;
        !           124:                        }
        !           125:                }
        !           126:        }
        !           127: 
        !           128:        /* free the fragment header */
        !           129:        m_freem(dtom(cfh));
        !           130: 
        !           131:        return(next);
        !           132: }
        !           133: 
        !           134: /*
        !           135:  * FUNCTION:           clnp_slowtimo
        !           136:  *
        !           137:  * PURPOSE:                    clnp timer processing; if the ttl expires on a 
        !           138:  *                                     packet on the reassembly queue, discard it.
        !           139:  *
        !           140:  * RETURNS:                    none
        !           141:  *
        !           142:  * SIDE EFFECTS:       
        !           143:  *
        !           144:  * NOTES:                      
        !           145:  */
        !           146: clnp_slowtimo()
        !           147: {
        !           148:        register struct clnp_fragl      *cfh = clnp_frags;
        !           149:        int s = splnet();
        !           150: 
        !           151:        while (cfh != NULL) {
        !           152:                if (--cfh->cfl_ttl == 0) {
        !           153:                        cfh = clnp_freefrags(cfh);
        !           154:                        INCSTAT(cns_fragtimeout);
        !           155:                } else {
        !           156:                        cfh = cfh->cfl_next;
        !           157:                }
        !           158:        }
        !           159:        splx(s);
        !           160: }
        !           161: 
        !           162: /*
        !           163:  * FUNCTION:           clnp_drain
        !           164:  *
        !           165:  * PURPOSE:                    drain off all datagram fragments
        !           166:  *
        !           167:  * RETURNS:                    none
        !           168:  *
        !           169:  * SIDE EFFECTS:       
        !           170:  *
        !           171:  * NOTES:                      
        !           172:  *     TODO: should send back ER
        !           173:  */
        !           174: clnp_drain()
        !           175: {
        !           176:        register struct clnp_fragl      *cfh = clnp_frags;
        !           177: 
        !           178:        while (cfh != NULL)
        !           179:                cfh = clnp_freefrags(cfh);
        !           180: }

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