1 /* $FreeBSD: src/sys/netinet6/scope6.c,v 1.1.2.3 2002/04/01 15:29:04 ume Exp $ */ 2 /* $DragonFly: src/sys/netinet6/scope6.c,v 1.4 2005/02/01 16:09:37 hrs Exp $ */ 3 /* $KAME: scope6.c,v 1.10 2000/07/24 13:29:31 itojun Exp $ */ 4 5 /* 6 * Copyright (C) 2000 WIDE Project. 7 * All rights reserved. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 3. Neither the name of the project nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/malloc.h> 36 #include <sys/mbuf.h> 37 #include <sys/socket.h> 38 #include <sys/systm.h> 39 #include <sys/queue.h> 40 41 #include <net/route.h> 42 #include <net/if.h> 43 44 #include <netinet/in.h> 45 46 #include <netinet6/in6_var.h> 47 #include <netinet6/scope6_var.h> 48 49 static struct scope6_id sid_default; 50 #define SID(ifp) \ 51 (((struct in6_ifextra *)(ifp)->if_afdata[AF_INET6])->scope6_id) 52 53 void 54 scope6_init() 55 { 56 bzero(&sid_default, sizeof(sid_default)); 57 } 58 59 struct scope6_id * 60 scope6_ifattach(struct ifnet *ifp) 61 { 62 int s = splnet(); 63 struct scope6_id *sid; 64 65 sid = (struct scope6_id *)malloc(sizeof(*sid), M_IFADDR, M_WAITOK); 66 bzero(sid, sizeof(*sid)); 67 68 /* 69 * XXX: IPV6_ADDR_SCOPE_xxx macros are not standard. 70 * Should we rather hardcode here? 71 */ 72 sid->s6id_list[IPV6_ADDR_SCOPE_NODELOCAL] = ifp->if_index; 73 sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = ifp->if_index; 74 #ifdef MULTI_SCOPE 75 /* by default, we don't care about scope boundary for these scopes. */ 76 sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL] = 1; 77 sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL] = 1; 78 #endif 79 80 splx(s); 81 return sid; 82 } 83 84 void 85 scope6_ifdetach(struct scope6_id *sid) 86 { 87 free(sid, M_IFADDR); 88 } 89 90 int 91 scope6_set(struct ifnet *ifp, struct scope6_id *idlist) 92 { 93 int i, s; 94 int error = 0; 95 struct scope6_id *sid = SID(ifp); 96 97 if (!sid) /* paranoid? */ 98 return(EINVAL); 99 100 /* 101 * XXX: We need more consistency checks of the relationship among 102 * scopes (e.g. an organization should be larger than a site). 103 */ 104 105 /* 106 * TODO(XXX): after setting, we should reflect the changes to 107 * interface addresses, routing table entries, PCB entries... 108 */ 109 110 s = splnet(); 111 112 for (i = 0; i < 16; i++) { 113 if (idlist->s6id_list[i] && 114 idlist->s6id_list[i] != sid->s6id_list[i]) { 115 if (i == IPV6_ADDR_SCOPE_LINKLOCAL && 116 idlist->s6id_list[i] > if_index) { 117 /* 118 * XXX: theoretically, there should be no 119 * relationship between link IDs and interface 120 * IDs, but we check the consistency for 121 * safety in later use. 122 */ 123 splx(s); 124 return(EINVAL); 125 } 126 127 /* 128 * XXX: we must need lots of work in this case, 129 * but we simply set the new value in this initial 130 * implementation. 131 */ 132 sid->s6id_list[i] = idlist->s6id_list[i]; 133 } 134 } 135 splx(s); 136 137 return(error); 138 } 139 140 int 141 scope6_get(struct ifnet *ifp, struct scope6_id *idlist) 142 { 143 struct scope6_id *sid = SID(ifp); 144 145 if (sid == NULL) /* paranoid? */ 146 return(EINVAL); 147 148 *idlist = *sid; 149 150 return(0); 151 } 152 153 154 /* 155 * Get a scope of the address. Node-local, link-local, site-local or global. 156 */ 157 int 158 in6_addrscope(struct in6_addr *addr) 159 { 160 int scope; 161 162 if (addr->s6_addr8[0] == 0xfe) { 163 scope = addr->s6_addr8[1] & 0xc0; 164 165 switch (scope) { 166 case 0x80: 167 return IPV6_ADDR_SCOPE_LINKLOCAL; 168 break; 169 case 0xc0: 170 return IPV6_ADDR_SCOPE_SITELOCAL; 171 break; 172 default: 173 return IPV6_ADDR_SCOPE_GLOBAL; /* just in case */ 174 break; 175 } 176 } 177 178 179 if (addr->s6_addr8[0] == 0xff) { 180 scope = addr->s6_addr8[1] & 0x0f; 181 182 /* 183 * due to other scope such as reserved, 184 * return scope doesn't work. 185 */ 186 switch (scope) { 187 case IPV6_ADDR_SCOPE_NODELOCAL: 188 return IPV6_ADDR_SCOPE_NODELOCAL; 189 break; 190 case IPV6_ADDR_SCOPE_LINKLOCAL: 191 return IPV6_ADDR_SCOPE_LINKLOCAL; 192 break; 193 case IPV6_ADDR_SCOPE_SITELOCAL: 194 return IPV6_ADDR_SCOPE_SITELOCAL; 195 break; 196 default: 197 return IPV6_ADDR_SCOPE_GLOBAL; 198 break; 199 } 200 } 201 202 if (bcmp(&in6addr_loopback, addr, sizeof(*addr) - 1) == 0) { 203 if (addr->s6_addr8[15] == 1) /* loopback */ 204 return IPV6_ADDR_SCOPE_NODELOCAL; 205 if (addr->s6_addr8[15] == 0) /* unspecified */ 206 return IPV6_ADDR_SCOPE_LINKLOCAL; 207 } 208 209 return IPV6_ADDR_SCOPE_GLOBAL; 210 } 211 212 int 213 in6_addr2scopeid(struct ifnet *ifp, /* must not be NULL */ 214 struct in6_addr *addr) /* must not be NULL */ 215 { 216 int scope; 217 struct scope6_id *sid = SID(ifp); 218 219 #ifdef DIAGNOSTIC 220 if (sid == NULL) { /* should not happen */ 221 panic("in6_addr2zoneid: scope array is NULL"); 222 /* NOTREACHED */ 223 } 224 #endif 225 226 /* 227 * special case: the loopback address can only belong to a loopback 228 * interface. 229 */ 230 if (IN6_IS_ADDR_LOOPBACK(addr)) { 231 if (!(ifp->if_flags & IFF_LOOPBACK)) 232 return (-1); 233 else 234 return (0); /* there's no ambiguity */ 235 } 236 237 scope = in6_addrscope(addr); 238 239 switch(scope) { 240 case IPV6_ADDR_SCOPE_NODELOCAL: 241 return(-1); /* XXX: is this an appropriate value? */ 242 243 case IPV6_ADDR_SCOPE_LINKLOCAL: 244 return (sid->s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL]); 245 246 case IPV6_ADDR_SCOPE_SITELOCAL: 247 return (sid->s6id_list[IPV6_ADDR_SCOPE_SITELOCAL]); 248 249 case IPV6_ADDR_SCOPE_ORGLOCAL: 250 return (sid->s6id_list[IPV6_ADDR_SCOPE_ORGLOCAL]); 251 252 default: 253 return(0); /* XXX: treat as global. */ 254 } 255 } 256 257 void 258 scope6_setdefault(struct ifnet *ifp) /* note that this might be NULL */ 259 { 260 /* 261 * Currently, this function just set the default "interfaces" 262 * and "links" according to the given interface. 263 * We might eventually have to separate the notion of "link" from 264 * "interface" and provide a user interface to set the default. 265 */ 266 if (ifp) { 267 sid_default.s6id_list[IPV6_ADDR_SCOPE_NODELOCAL] = 268 ifp->if_index; 269 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 270 ifp->if_index; 271 } else { 272 sid_default.s6id_list[IPV6_ADDR_SCOPE_NODELOCAL] = 0; 273 sid_default.s6id_list[IPV6_ADDR_SCOPE_LINKLOCAL] = 0; 274 } 275 } 276 277 int 278 scope6_get_default(struct scope6_id *idlist) 279 { 280 *idlist = sid_default; 281 282 return(0); 283 } 284 285 u_int32_t 286 scope6_addr2default(struct in6_addr *addr) 287 { 288 /* 289 * special case: The loopback address should be considered as 290 * link-local, but there's no ambiguity in the syntax. 291 */ 292 if (IN6_IS_ADDR_LOOPBACK(addr)) 293 return (0); 294 295 return (sid_default.s6id_list[in6_addrscope(addr)]); 296 } 297