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      1 /*	$NetBSD: at_proto.c,v 1.23 2022/09/03 01:48:22 thorpej 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 (at) umich.edu
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: at_proto.c,v 1.23 2022/09/03 01:48:22 thorpej 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/if_ether.h>
     41 #include <netinet/in.h>
     42 #include <net/route.h>
     43 
     44 #include <netatalk/at.h>
     45 #include <netatalk/ddp.h>
     46 #include <netatalk/at_var.h>
     47 #include <netatalk/ddp_var.h>
     48 #include <netatalk/at_extern.h>
     49 
     50 DOMAIN_DEFINE(atalkdomain);	/* forward declare and add to link set */
     51 
     52 const struct protosw atalksw[] = {
     53     {
     54 	.pr_type = SOCK_DGRAM,
     55 	.pr_domain = &atalkdomain,
     56 	.pr_protocol = ATPROTO_DDP,
     57 	.pr_flags = PR_ATOMIC|PR_ADDR,
     58 	.pr_usrreqs = &ddp_usrreqs,
     59 	.pr_init = ddp_init,
     60     },
     61 };
     62 
     63 struct domain atalkdomain = {
     64 	.dom_family = PF_APPLETALK,
     65 	.dom_name = "appletalk",
     66 	.dom_init = NULL,
     67 	.dom_externalize = NULL,
     68 	.dom_dispose = NULL,
     69 	.dom_protosw = atalksw,
     70 	.dom_protoswNPROTOSW = &atalksw[__arraycount(atalksw)],
     71 	.dom_rtattach = rt_inithead,
     72 	.dom_rtoffset = 32,
     73 	.dom_maxrtkey = sizeof(struct sockaddr_at),
     74 	.dom_ifattach = NULL,
     75 	.dom_ifdetach = NULL,
     76 	.dom_link = { NULL },
     77 	.dom_mowner = MOWNER_INIT("",""),
     78 	.dom_sa_cmpofs = offsetof(struct sockaddr_at, sat_addr),
     79 	.dom_sa_cmplen = sizeof(struct at_addr),
     80 };
     81 
     82 int
     83 sockaddr_at_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
     84 {
     85 	int rc;
     86 	uint_fast8_t len;
     87 	const uint_fast8_t addrofs = offsetof(struct sockaddr_at, sat_addr),
     88 			   addrend = addrofs + sizeof(struct at_addr);
     89 	const struct sockaddr_at *sat1, *sat2;
     90 
     91 	sat1 = satocsat(sa1);
     92 	sat2 = satocsat(sa2);
     93 
     94 	len = MIN(addrend, MIN(sat1->sat_len, sat2->sat_len));
     95 
     96 	if (len > addrofs &&
     97 	    (rc = memcmp(&sat1->sat_addr, &sat2->sat_addr, len - addrofs)) != 0)
     98 		return rc;
     99 
    100 	return sat1->sat_len - sat2->sat_len;
    101 }
    102