link_proto.c revision 1.1
1 /* $NetBSD: link_proto.c,v 1.1 2007/07/19 20:48:52 dyoung Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 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 * @(#)uipc_proto.c 8.2 (Berkeley) 2/14/95 32 */ 33 34 #include <sys/cdefs.h> 35 __KERNEL_RCSID(0, "$NetBSD: link_proto.c,v 1.1 2007/07/19 20:48:52 dyoung Exp $"); 36 37 #include <sys/param.h> 38 #include <sys/socket.h> 39 #include <sys/protosw.h> 40 #include <sys/domain.h> 41 #include <sys/mbuf.h> 42 #include <sys/un.h> 43 #include <sys/socketvar.h> 44 45 #include <net/if.h> 46 #include <net/if_dl.h> 47 #include <net/raw_cb.h> 48 49 static int sockaddr_dl_cmp(const struct sockaddr *, const struct sockaddr *); 50 51 /* 52 * Definitions of protocols supported in the link-layer domain. 53 */ 54 55 DOMAIN_DEFINE(linkdomain); /* forward define and add to link set */ 56 57 POOL_INIT(sockaddr_dl_pool, sizeof(struct sockaddr_dl), 0, 0, 0, 58 "sockaddr_dl_pool", NULL, IPL_NET); 59 60 struct domain linkdomain = { 61 .dom_family = AF_LINK, 62 .dom_name = "link", 63 .dom_externalize = NULL, 64 .dom_dispose = NULL, 65 .dom_protosw = NULL, 66 .dom_protoswNPROTOSW = NULL, 67 .dom_sa_pool = &sockaddr_dl_pool, 68 .dom_sa_len = sizeof(struct sockaddr_dl), 69 .dom_sockaddr_cmp = sockaddr_dl_cmp 70 }; 71 72 #define satocsdl(__sa) ((const struct sockaddr_dl *)(__sa)) 73 74 /* Compare the field at byte offsets [fieldstart, fieldend) in 75 * two memory regions, [l, l + llen) and [r, r + llen). 76 */ 77 static inline int 78 submemcmp(const void *l, const void *r, 79 const uint_fast8_t llen, const uint_fast8_t rlen, 80 const uint_fast8_t fieldstart, const uint_fast8_t fieldend) 81 { 82 uint_fast8_t cmpend, minlen; 83 const uint8_t *lb = l, *rb = r; 84 int rc; 85 86 minlen = MIN(llen, rlen); 87 88 /* The field is missing from one region. The shorter region is the 89 * lesser region. 90 */ 91 if (fieldstart >= minlen) 92 return llen - rlen; 93 94 /* Two empty, present fields are always equal. */ 95 if (fieldstart > fieldend) 96 return 0; 97 98 cmpend = MIN(fieldend, minlen); 99 100 rc = memcmp(&lb[fieldstart], &rb[fieldstart], cmpend - fieldstart); 101 102 if (rc != 0) 103 return rc; 104 /* If one or both fields are truncated, then the shorter is the lesser 105 * field. 106 */ 107 if (minlen < fieldend) 108 return llen - rlen; 109 /* Fields are full-length and equal. The fields are equal. */ 110 return 0; 111 } 112 113 static int 114 sockaddr_dl_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2) 115 { 116 int rc; 117 const uint_fast8_t indexofs = offsetof(struct sockaddr_dl, sdl_index); 118 const uint_fast8_t nlenofs = offsetof(struct sockaddr_dl, sdl_nlen); 119 uint_fast8_t dataofs = offsetof(struct sockaddr_dl, sdl_data[0]); 120 const struct sockaddr_dl *sdl1, *sdl2; 121 122 sdl1 = satocsdl(sa1); 123 sdl2 = satocsdl(sa2); 124 125 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 126 indexofs, nlenofs); 127 128 if (rc != 0) 129 return rc; 130 131 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 132 dataofs, dataofs + MIN(sdl1->sdl_nlen, sdl2->sdl_nlen)); 133 134 if (rc != 0) 135 return rc; 136 137 if (sdl1->sdl_nlen != sdl2->sdl_nlen) 138 return sdl1->sdl_nlen - sdl2->sdl_nlen; 139 140 dataofs += sdl1->sdl_nlen; 141 142 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 143 dataofs, dataofs + MIN(sdl1->sdl_alen, sdl2->sdl_alen)); 144 145 if (rc != 0) 146 return rc; 147 148 if (sdl1->sdl_alen != sdl2->sdl_alen) 149 return sdl1->sdl_alen - sdl2->sdl_alen; 150 151 dataofs += sdl1->sdl_alen; 152 153 rc = submemcmp(sdl1, sdl2, sdl1->sdl_len, sdl2->sdl_len, 154 dataofs, dataofs + MIN(sdl1->sdl_slen, sdl2->sdl_slen)); 155 156 if (sdl1->sdl_slen != sdl2->sdl_slen) 157 return sdl1->sdl_slen - sdl2->sdl_slen; 158 159 return sdl1->sdl_len - sdl2->sdl_len; 160 } 161
Indexes created Thu Sep 25 15:09:46 GMT 2025