| 1 | /*- |
| 2 | * Copyright (c) 1991 The Regents of the University of California. |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * %sccs.include.redist.c% |
| 6 | * |
| 7 | * @(#)clnp_timer.c 7.6 (Berkeley) %G% |
| 8 | */ |
| 9 | |
| 10 | /*********************************************************** |
| 11 | Copyright IBM Corporation 1987 |
| 12 | |
| 13 | All Rights Reserved |
| 14 | |
| 15 | Permission to use, copy, modify, and distribute this software and its |
| 16 | documentation for any purpose and without fee is hereby granted, |
| 17 | provided that the above copyright notice appear in all copies and that |
| 18 | both that copyright notice and this permission notice appear in |
| 19 | supporting documentation, and that the name of IBM not be |
| 20 | used in advertising or publicity pertaining to distribution of the |
| 21 | software without specific, written prior permission. |
| 22 | |
| 23 | IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING |
| 24 | ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL |
| 25 | IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR |
| 26 | ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, |
| 27 | WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, |
| 28 | ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS |
| 29 | SOFTWARE. |
| 30 | |
| 31 | ******************************************************************/ |
| 32 | |
| 33 | /* |
| 34 | * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison |
| 35 | */ |
| 36 | /* $Header: clnp_timer.c,v 4.2 88/06/29 14:59:05 hagens Exp $ */ |
| 37 | /* $Source: /usr/argo/sys/netiso/RCS/clnp_timer.c,v $ */ |
| 38 | |
| 39 | #include <sys/param.h> |
| 40 | #include <sys/mbuf.h> |
| 41 | #include <sys/domain.h> |
| 42 | #include <sys/protosw.h> |
| 43 | #include <sys/socket.h> |
| 44 | #include <sys/socketvar.h> |
| 45 | #include <sys/errno.h> |
| 46 | |
| 47 | #include <net/if.h> |
| 48 | #include <net/route.h> |
| 49 | |
| 50 | #include <netiso/iso.h> |
| 51 | #include <netiso/clnp.h> |
| 52 | #include <netiso/clnp_stat.h> |
| 53 | #include <netiso/argo_debug.h> |
| 54 | |
| 55 | extern struct clnp_fragl *clnp_frags; |
| 56 | |
| 57 | /* |
| 58 | * FUNCTION: clnp_freefrags |
| 59 | * |
| 60 | * PURPOSE: Free the resources associated with a fragment |
| 61 | * |
| 62 | * RETURNS: pointer to next fragment in list of fragments |
| 63 | * |
| 64 | * SIDE EFFECTS: |
| 65 | * |
| 66 | * NOTES: |
| 67 | * TODO: send ER back to source |
| 68 | */ |
| 69 | struct clnp_fragl * |
| 70 | clnp_freefrags(cfh) |
| 71 | register struct clnp_fragl *cfh; /* fragment header to delete */ |
| 72 | { |
| 73 | struct clnp_fragl *next = cfh->cfl_next; |
| 74 | struct clnp_frag *cf; |
| 75 | |
| 76 | /* free any frags hanging around */ |
| 77 | cf = cfh->cfl_frags; |
| 78 | while (cf != NULL) { |
| 79 | struct clnp_frag *cf_next = cf->cfr_next; |
| 80 | INCSTAT(cns_fragdropped); |
| 81 | m_freem(cf->cfr_data); |
| 82 | cf = cf_next; |
| 83 | } |
| 84 | |
| 85 | /* free the copy of the header */ |
| 86 | INCSTAT(cns_fragdropped); |
| 87 | m_freem(cfh->cfl_orighdr); |
| 88 | |
| 89 | if (clnp_frags == cfh) { |
| 90 | clnp_frags = cfh->cfl_next; |
| 91 | } else { |
| 92 | struct clnp_fragl *scan; |
| 93 | |
| 94 | for (scan = clnp_frags; scan != NULL; scan = scan->cfl_next) { |
| 95 | if (scan->cfl_next == cfh) { |
| 96 | scan->cfl_next = cfh->cfl_next; |
| 97 | break; |
| 98 | } |
| 99 | } |
| 100 | } |
| 101 | |
| 102 | /* free the fragment header */ |
| 103 | m_freem(dtom(cfh)); |
| 104 | |
| 105 | return(next); |
| 106 | } |
| 107 | |
| 108 | /* |
| 109 | * FUNCTION: clnp_slowtimo |
| 110 | * |
| 111 | * PURPOSE: clnp timer processing; if the ttl expires on a |
| 112 | * packet on the reassembly queue, discard it. |
| 113 | * |
| 114 | * RETURNS: none |
| 115 | * |
| 116 | * SIDE EFFECTS: |
| 117 | * |
| 118 | * NOTES: |
| 119 | */ |
| 120 | clnp_slowtimo() |
| 121 | { |
| 122 | register struct clnp_fragl *cfh = clnp_frags; |
| 123 | int s = splnet(); |
| 124 | |
| 125 | while (cfh != NULL) { |
| 126 | if (--cfh->cfl_ttl == 0) { |
| 127 | cfh = clnp_freefrags(cfh); |
| 128 | INCSTAT(cns_fragtimeout); |
| 129 | } else { |
| 130 | cfh = cfh->cfl_next; |
| 131 | } |
| 132 | } |
| 133 | splx(s); |
| 134 | } |
| 135 | |
| 136 | /* |
| 137 | * FUNCTION: clnp_drain |
| 138 | * |
| 139 | * PURPOSE: drain off all datagram fragments |
| 140 | * |
| 141 | * RETURNS: none |
| 142 | * |
| 143 | * SIDE EFFECTS: |
| 144 | * |
| 145 | * NOTES: |
| 146 | * TODO: should send back ER |
| 147 | */ |
| 148 | clnp_drain() |
| 149 | { |
| 150 | register struct clnp_fragl *cfh = clnp_frags; |
| 151 | |
| 152 | while (cfh != NULL) |
| 153 | cfh = clnp_freefrags(cfh); |
| 154 | } |