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at_proto.c revision 1.17 
      1 /*	$NetBSD: at_proto.c,v 1.17 2011/03/31 19:40:52 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 (at) umich.edu
     27  */
     28 
     29 #include <sys/cdefs.h>
     30 __KERNEL_RCSID(0, "$NetBSD: at_proto.c,v 1.17 2011/03/31 19:40:52 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 = rt_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 }
    109