The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/netiso/iso_proto.c

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    1 /*      $NetBSD: iso_proto.c,v 1.28 2008/04/24 11:38:38 ad Exp $        */
    2 
    3 /*-
    4  * Copyright (c) 1991, 1993
    5  *      The Regents of the University of California.  All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)iso_proto.c 8.2 (Berkeley) 2/9/95
   32  */
   33 
   34 /***********************************************************
   35                 Copyright IBM Corporation 1987
   36 
   37                       All Rights Reserved
   38 
   39 Permission to use, copy, modify, and distribute this software and its
   40 documentation for any purpose and without fee is hereby granted,
   41 provided that the above copyright notice appear in all copies and that
   42 both that copyright notice and this permission notice appear in
   43 supporting documentation, and that the name of IBM not be
   44 used in advertising or publicity pertaining to distribution of the
   45 software without specific, written prior permission.
   46 
   47 IBM DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
   48 ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
   49 IBM BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
   50 ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
   51 WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
   52 ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
   53 SOFTWARE.
   54 
   55 ******************************************************************/
   56 
   57 /*
   58  * ARGO Project, Computer Sciences Dept., University of Wisconsin - Madison
   59  */
   60 /*
   61  * iso_proto.c : protocol switch tables in the ISO domain
   62  *
   63  * ISO protocol family includes TP, CLTP, CLNP, 8208
   64  * TP and CLNP are implemented here.
   65  */
   66 
   67 #include <sys/cdefs.h>
   68 __KERNEL_RCSID(0, "$NetBSD: iso_proto.c,v 1.28 2008/04/24 11:38:38 ad Exp $");
   69 
   70 
   71 #include <sys/param.h>
   72 #include <sys/socket.h>
   73 #include <sys/protosw.h>
   74 #include <sys/domain.h>
   75 #include <sys/mbuf.h>
   76 
   77 #include <net/radix.h>
   78 
   79 #include <netiso/iso.h>
   80 
   81 #include <netiso/clnp.h>
   82 #include <netiso/tp_param.h>
   83 #include <netiso/tp_var.h>
   84 #include <netiso/esis.h>
   85 #include <netiso/idrp_var.h>
   86 #include <netiso/iso_pcb.h>
   87 #include <netiso/cltp_var.h>
   88 
   89 const int isoctlerrmap[PRC_NCMDS] = {
   90         0,              0,              0,              0,
   91         0,              EMSGSIZE,       EHOSTDOWN,      EHOSTUNREACH,
   92         EHOSTUNREACH,   EHOSTUNREACH,   ECONNREFUSED,   ECONNREFUSED,
   93         EMSGSIZE,       EHOSTUNREACH,   0,              0,
   94         0,              0,              0,              0,
   95         ENOPROTOOPT
   96 };
   97 
   98 DOMAIN_DEFINE(isodomain);       /* forward declare and add to link set */
   99 
  100 /* Wrappers to acquire kernel_lock. */
  101 
  102 PR_WRAP_USRREQ(cltp_usrreq)
  103 PR_WRAP_USRREQ(clnp_usrreq)
  104 PR_WRAP_USRREQ(idrp_usrreq)
  105 PR_WRAP_USRREQ(tp_usrreq)
  106 PR_WRAP_USRREQ(esis_usrreq)
  107 
  108 #define cltp_usrreq     cltp_usrreq_wrapper
  109 #define clnp_usrreq     clnp_usrreq_wrapper
  110 #define idrp_usrreq     idrp_usrreq_wrapper
  111 #define tp_usrreq       tp_usrreq_wrapper
  112 #define esis_usrreq     esis_usrreq_wrapper
  113 
  114 PR_WRAP_CTLOUTPUT(rclnp_ctloutput)
  115 PR_WRAP_CTLOUTPUT(tp_ctloutput)
  116 
  117 #define rclnp_ctloutput rclnp_ctloutput_wrapper
  118 #define tp_ctloutput    tp_ctloutput_wrapper
  119 
  120 PR_WRAP_CTLINPUT(esis_ctlinput)
  121 PR_WRAP_CTLINPUT(tpclnp_ctlinput)
  122 
  123 #define esis_ctlinput   esis_ctlinput_wrapper
  124 #define tpclnp_ctlinput tpclnp_ctlinput_wrapper
  125 
  126 const struct protosw  isosw[] = {
  127         /*
  128          *  We need a datagram entry through which net mgmt programs can get
  129          *      to the iso_control procedure (iso ioctls). Thus, a minimal
  130          *      SOCK_DGRAM interface is provided here.
  131          *  THIS ONE MUST BE FIRST: Kludge city : socket() says if(!proto) call
  132          *  pffindtype, which gets the first entry that matches the type.
  133          *  sigh.
  134          */
  135         { .pr_type = SOCK_DGRAM,
  136           .pr_domain = &isodomain,
  137           .pr_protocol = ISOPROTO_CLTP,
  138           .pr_flags = PR_ATOMIC | PR_ADDR,
  139           .pr_input = 0,
  140           .pr_output = cltp_output,
  141           .pr_ctlinput = 0,
  142           .pr_ctloutput = 0,
  143           .pr_usrreq = cltp_usrreq,
  144           .pr_init = cltp_init,
  145           .pr_fasttimo = 0,
  146           .pr_slowtimo = 0,
  147           .pr_drain = 0
  148         },
  149 
  150         /*
  151          *      A datagram interface for clnp cannot co-exist with TP/CLNP
  152          *  because CLNP has no way to discriminate incoming TP packets from
  153          *  packets coming in for any other higher layer protocol.
  154          *  Old way: set it up so that pffindproto(... dgm, clnp) fails.
  155          *  New way: let pffindproto work (for x.25, thank you) but create
  156          *      a clnp_usrreq() that returns error on PRU_ATTACH.
  157          */
  158         { .pr_type = SOCK_DGRAM,
  159           .pr_domain = &isodomain,
  160           .pr_protocol = ISOPROTO_CLNP,
  161           .pr_flags = 0,
  162           .pr_input = 0,
  163           .pr_output = clnp_output,
  164           .pr_ctlinput = 0,
  165           .pr_ctloutput = 0,
  166           .pr_usrreq = clnp_usrreq,
  167           .pr_init = clnp_init,
  168           .pr_fasttimo = 0,
  169           .pr_slowtimo = clnp_slowtimo,
  170           .pr_drain =  clnp_drain,
  171         },
  172 
  173         /* raw clnp */
  174         { .pr_type = SOCK_RAW,
  175           .pr_domain = &isodomain,
  176           .pr_protocol = ISOPROTO_RAW,
  177           .pr_flags = PR_ATOMIC | PR_ADDR,
  178           .pr_input = rclnp_input,
  179           .pr_output = rclnp_output,
  180           .pr_ctlinput = 0,
  181           .pr_ctloutput = rclnp_ctloutput,
  182           .pr_usrreq = clnp_usrreq,
  183           .pr_init = 0,
  184           .pr_fasttimo = 0,
  185           .pr_slowtimo = 0,
  186           .pr_drain = 0
  187         },
  188 
  189         /* ES-IS protocol */
  190         { .pr_type = SOCK_DGRAM,
  191           .pr_domain = &isodomain,
  192           .pr_protocol = ISOPROTO_ESIS,
  193           .pr_flags = PR_ATOMIC | PR_ADDR,
  194           .pr_input = esis_input,
  195           .pr_output = 0,
  196           .pr_ctlinput = esis_ctlinput,
  197           .pr_ctloutput = 0,
  198           .pr_usrreq = esis_usrreq,
  199           .pr_init = esis_init,
  200           .pr_fasttimo = 0,
  201           .pr_slowtimo = 0,
  202           .pr_drain = 0
  203         },
  204 
  205         /* ISOPROTO_INTRAISIS */
  206         { .pr_type = SOCK_DGRAM,
  207           .pr_domain = &isodomain,
  208           .pr_protocol = ISOPROTO_INTRAISIS,
  209           .pr_flags = PR_ATOMIC | PR_ADDR,
  210           .pr_input = isis_input,
  211           .pr_output = 0,
  212           .pr_ctlinput = 0,
  213           .pr_ctloutput = 0,
  214           .pr_usrreq = esis_usrreq,
  215           .pr_init = 0,
  216           .pr_fasttimo = 0,
  217           .pr_slowtimo = 0,
  218           .pr_drain = 0
  219         },
  220 
  221         /* ISOPROTO_IDRP */
  222         { .pr_type = SOCK_DGRAM,
  223           .pr_domain = &isodomain,
  224           .pr_protocol = ISOPROTO_IDRP,
  225           .pr_flags = PR_ATOMIC | PR_ADDR,
  226           .pr_input = idrp_input,
  227           .pr_output = 0,
  228           .pr_ctlinput = 0,
  229           .pr_ctloutput = 0,
  230           .pr_usrreq = idrp_usrreq,
  231           .pr_init = idrp_init,
  232           .pr_fasttimo = 0,
  233           .pr_slowtimo = 0,
  234           .pr_drain = 0
  235         },
  236 
  237         /* ISOPROTO_TP */
  238         { .pr_type = SOCK_SEQPACKET,
  239           .pr_domain = &isodomain,
  240           .pr_protocol = ISOPROTO_TP,
  241           .pr_flags = PR_CONNREQUIRED | PR_WANTRCVD | PR_LISTEN | PR_ABRTACPTDIS,
  242           .pr_input = tpclnp_input,
  243           .pr_output = 0,
  244           .pr_ctlinput = tpclnp_ctlinput,
  245           .pr_ctloutput = tp_ctloutput,
  246           .pr_usrreq = tp_usrreq,
  247           .pr_init = tp_init,
  248           .pr_fasttimo = tp_fasttimo,
  249           .pr_slowtimo = tp_slowtimo,
  250           .pr_drain = tp_drain,
  251         },
  252 };
  253 
  254 extern struct ifqueue clnlintrq;
  255 
  256 struct domain   isodomain = {
  257         .dom_family = PF_ISO,
  258         .dom_name = "iso-domain",
  259         .dom_init = NULL,
  260         .dom_externalize = NULL,
  261         .dom_dispose = NULL,
  262         .dom_protosw = isosw,
  263         .dom_protoswNPROTOSW = &isosw[sizeof(isosw) / sizeof(isosw[0])],
  264         .dom_rtattach = rn_inithead,            /* rtattach */
  265         .dom_rtoffset = 48,                     /* rtoffset */
  266         .dom_maxrtkey = sizeof(struct sockaddr_iso),    /* maxkeylen */
  267         .dom_ifattach = NULL,
  268         .dom_ifdetach = NULL,
  269         .dom_ifqueues = { &clnlintrq, NULL },           /* ifqueues */
  270         .dom_link = { NULL },
  271         .dom_mowner = MOWNER_INIT("",""),
  272         .dom_rtcache = LIST_HEAD_INITIALIZER(isodomain.dom_rtcache),
  273         .dom_sockaddr_cmp = sockaddr_iso_cmp
  274 };
  275 
  276 int
  277 sockaddr_iso_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
  278 {
  279         int rc;
  280         uint_fast8_t len, nlen;
  281         const uint_fast8_t addrofs = offsetof(struct sockaddr_iso, siso_data);
  282         const struct sockaddr_iso *siso1, *siso2;
  283 
  284         siso1 = satocsiso(sa1);
  285         siso2 = satocsiso(sa2);
  286 
  287         len = MIN(siso1->siso_len, siso2->siso_len);
  288         /* No siso_nlen present? */ 
  289         if (len < addrofs)
  290                 return siso1->siso_len - siso2->siso_len;
  291 
  292         nlen = MIN(siso1->siso_nlen, siso2->siso_nlen);
  293         if (nlen > addrofs &&
  294             (rc = memcmp(siso1->siso_data, siso2->siso_data, nlen)) != 0)
  295                 return rc;
  296 
  297         return siso1->siso_nlen - siso2->siso_nlen;
  298 }

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