sys/netatalk/at_proto.c

   1 /*      $NetBSD: at_proto.c,v 1.15 2007/08/30 02:17:36 dyoung Exp $     */
   2
   3 /*
   4  * Copyright (c) 1990,1991 Regents of The University of Michigan.
   5  * All Rights Reserved.
   6  *
   7  * Permission to use, copy, modify, and distribute this software and
   8  * its documentation for any purpose and without fee is hereby granted,
   9  * provided that the above copyright notice appears in all copies and
  10  * that both that copyright notice and this permission notice appear
  11  * in supporting documentation, and that the name of The University
  12  * of Michigan not be used in advertising or publicity pertaining to
  13  * distribution of the software without specific, written prior
  14  * permission. This software is supplied as is without expressed or
  15  * implied warranties of any kind.
  16  *
  17  * This product includes software developed by the University of
  18  * California, Berkeley and its contributors.
  19  *
  20  *      Research Systems Unix Group
  21  *      The University of Michigan
  22  *      c/o Wesley Craig
  23  *      535 W. William Street
  24  *      Ann Arbor, Michigan
  25  *      +1-313-764-2278
  26  *      netatalk@umich.edu
  27  */
  28
  29 #include <sys/cdefs.h>
  30 __KERNEL_RCSID(0, "$NetBSD: at_proto.c,v 1.15 2007/08/30 02:17:36 dyoung Exp $");
  31
  32 #include <sys/param.h>
  33 #include <sys/systm.h>
  34 #include <sys/protosw.h>
  35 #include <sys/domain.h>
  36 #include <sys/socket.h>
  37
  38 #include <sys/kernel.h>
  39 #include <net/if.h>
  40 #include <net/radix.h>
  41 #include <net/if_ether.h>
  42 #include <netinet/in.h>
  43 #include <net/route.h>
  44
  45 #include <netatalk/at.h>
  46 #include <netatalk/ddp.h>
  47 #include <netatalk/at_var.h>
  48 #include <netatalk/ddp_var.h>
  49 #include <netatalk/at_extern.h>
  50
  51 DOMAIN_DEFINE(atalkdomain);     /* forward declare and add to link set */
  52
  53 PR_WRAP_USRREQ(ddp_usrreq)
  54 #define ddp_usrreq      ddp_usrreq_wrapper
  55
  56 const struct protosw atalksw[] = {
  57     {
  58         .pr_type = SOCK_DGRAM,
  59         .pr_domain = &atalkdomain,
  60         .pr_protocol = ATPROTO_DDP,
  61         .pr_flags = PR_ATOMIC|PR_ADDR,
  62         .pr_output = ddp_output,
  63         .pr_usrreq = ddp_usrreq,
  64         .pr_init = ddp_init,
  65     },
  66 };
  67
  68 struct domain atalkdomain = {
  69         .dom_family = PF_APPLETALK,
  70         .dom_name = "appletalk",
  71         .dom_init = NULL,
  72         .dom_externalize = NULL,
  73         .dom_dispose = NULL,
  74         .dom_protosw = atalksw,
  75         .dom_protoswNPROTOSW = &atalksw[__arraycount(atalksw)],
  76         .dom_rtattach = rn_inithead,
  77         .dom_rtoffset = 32,
  78         .dom_maxrtkey = sizeof(struct sockaddr_at),
  79         .dom_ifattach = NULL,
  80         .dom_ifdetach = NULL,
  81         .dom_ifqueues = { &atintrq1, &atintrq2 },
  82         .dom_link = { NULL },
  83         .dom_mowner = MOWNER_INIT("",""),
  84         .dom_sa_cmpofs = offsetof(struct sockaddr_at, sat_addr),
  85         .dom_sa_cmplen = sizeof(struct at_addr),
  86         .dom_rtcache = LIST_HEAD_INITIALIZER(atalkdomain.dom_rtcache)
  87 };
  88
  89 int
  90 sockaddr_at_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
  91 {
  92         int rc;
  93         uint_fast8_t len;
  94         const uint_fast8_t addrofs = offsetof(struct sockaddr_at, sat_addr),
  95                            addrend = addrofs + sizeof(struct at_addr);
  96         const struct sockaddr_at *sat1, *sat2;
  97
  98         sat1 = satocsat(sa1);
  99         sat2 = satocsat(sa2);
 100
 101         len = MIN(addrend, MIN(sat1->sat_len, sat2->sat_len));
 102
 103         if (len > addrofs &&
 104             (rc = memcmp(&sat1->sat_addr, &sat2->sat_addr, len - addrofs)) != 0)
 105                 return rc;
 106
 107         return sat1->sat_len - sat2->sat_len;
 108 }