in_var.h revision 1.88
1 /* $NetBSD: in_var.h,v 1.88 2016/10/11 13:59:30 roy Exp $ */ 2 3 /*- 4 * Copyright (c) 1998 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Public Access Networks Corporation ("Panix"). It was developed under 9 * contract to Panix by Eric Haszlakiewicz and Thor Lancelot Simon. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33 /* 34 * Copyright (c) 1985, 1986, 1993 35 * The Regents of the University of California. All rights reserved. 36 * 37 * Redistribution and use in source and binary forms, with or without 38 * modification, are permitted provided that the following conditions 39 * are met: 40 * 1. Redistributions of source code must retain the above copyright 41 * notice, this list of conditions and the following disclaimer. 42 * 2. Redistributions in binary form must reproduce the above copyright 43 * notice, this list of conditions and the following disclaimer in the 44 * documentation and/or other materials provided with the distribution. 45 * 3. Neither the name of the University nor the names of its contributors 46 * may be used to endorse or promote products derived from this software 47 * without specific prior written permission. 48 * 49 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 50 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 51 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 52 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 53 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 54 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 55 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 56 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 57 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 58 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 59 * SUCH DAMAGE. 60 * 61 * @(#)in_var.h 8.2 (Berkeley) 1/9/95 62 */ 63 64 #ifndef _NETINET_IN_VAR_H_ 65 #define _NETINET_IN_VAR_H_ 66 67 #include <sys/queue.h> 68 69 #define IN_IFF_TENTATIVE 0x01 /* tentative address */ 70 #define IN_IFF_DUPLICATED 0x02 /* DAD detected duplicate */ 71 #define IN_IFF_DETACHED 0x04 /* may be detached from the link */ 72 #define IN_IFF_TRYTENTATIVE 0x08 /* intent to try DAD */ 73 74 #define IN_IFFBITS \ 75 "\020\1TENTATIVE\2DUPLICATED\3DETACHED\4TRYTENTATIVE" 76 77 /* do not input/output */ 78 #define IN_IFF_NOTREADY \ 79 (IN_IFF_TRYTENTATIVE | IN_IFF_TENTATIVE | IN_IFF_DUPLICATED) 80 81 /* 82 * Interface address, Internet version. One of these structures 83 * is allocated for each interface with an Internet address. 84 * The ifaddr structure contains the protocol-independent part 85 * of the structure and is assumed to be first. 86 */ 87 struct in_ifaddr { 88 struct ifaddr ia_ifa; /* protocol-independent info */ 89 #define ia_ifp ia_ifa.ifa_ifp 90 #define ia_flags ia_ifa.ifa_flags 91 /* ia_{,sub}net{,mask} in host order */ 92 u_int32_t ia_net; /* network number of interface */ 93 u_int32_t ia_netmask; /* mask of net part */ 94 u_int32_t ia_subnet; /* subnet number, including net */ 95 u_int32_t ia_subnetmask; /* mask of subnet part */ 96 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */ 97 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */ 98 TAILQ_ENTRY(in_ifaddr) ia_list; /* list of internet addresses */ 99 struct sockaddr_in ia_addr; /* reserve space for interface name */ 100 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 101 #define ia_broadaddr ia_dstaddr 102 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 103 LIST_HEAD(, in_multi) ia_multiaddrs; /* list of multicast addresses */ 104 struct in_multi *ia_allhosts; /* multicast address record for 105 the allhosts multicast group */ 106 uint16_t ia_idsalt; /* ip_id salt for this ia */ 107 int ia4_flags; /* address flags */ 108 void (*ia_dad_start) (struct ifaddr *); /* DAD start function */ 109 void (*ia_dad_stop) (struct ifaddr *); /* DAD stop function */ 110 time_t ia_dad_defended; /* last time of DAD defence */ 111 112 #ifdef _KERNEL 113 struct pslist_entry ia_hash_pslist_entry; 114 struct pslist_entry ia_pslist_entry; 115 #endif 116 }; 117 118 #ifdef _KERNEL 119 static inline void 120 ia4_acquire(struct in_ifaddr *ia, struct psref *psref) 121 { 122 123 KASSERT(ia != NULL); 124 ifa_acquire(&ia->ia_ifa, psref); 125 } 126 127 static inline void 128 ia4_release(struct in_ifaddr *ia, struct psref *psref) 129 { 130 131 if (ia == NULL) 132 return; 133 ifa_release(&ia->ia_ifa, psref); 134 } 135 #endif 136 137 struct in_aliasreq { 138 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 139 struct sockaddr_in ifra_addr; 140 struct sockaddr_in ifra_dstaddr; 141 #define ifra_broadaddr ifra_dstaddr 142 struct sockaddr_in ifra_mask; 143 }; 144 145 /* 146 * Given a pointer to an in_ifaddr (ifaddr), 147 * return a pointer to the addr as a sockaddr_in. 148 */ 149 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 150 151 #define iatoifa(ia) (struct ifaddr *)(ia) 152 153 #ifdef _KERNEL 154 155 /* Note: 61, 127, 251, 509, 1021, 2039 are good. */ 156 #ifndef IN_IFADDR_HASH_SIZE 157 #define IN_IFADDR_HASH_SIZE 509 158 #endif 159 160 /* 161 * This is a bit unconventional, and wastes a little bit of space, but 162 * because we want a very even hash function we don't use & in_ifaddrhash 163 * here, but rather % the hash size, which should obviously be prime. 164 */ 165 166 #define IN_IFADDR_HASH(x) in_ifaddrhashtbl[(u_long)(x) % IN_IFADDR_HASH_SIZE] 167 168 LIST_HEAD(in_ifaddrhashhead, in_ifaddr); /* Type of the hash head */ 169 TAILQ_HEAD(in_ifaddrhead, in_ifaddr); /* Type of the list head */ 170 171 extern u_long in_ifaddrhash; /* size of hash table - 1 */ 172 extern struct in_ifaddrhashhead *in_ifaddrhashtbl; /* Hash table head */ 173 extern struct in_ifaddrhead in_ifaddrhead; /* List head (in ip_input) */ 174 175 extern struct pslist_head *in_ifaddrhashtbl_pslist; 176 extern u_long in_ifaddrhash_pslist; 177 extern struct pslist_head in_ifaddrhead_pslist; 178 179 #define IN_IFADDR_HASH_PSLIST(x) \ 180 in_ifaddrhashtbl_pslist[(u_long)(x) % IN_IFADDR_HASH_SIZE] 181 182 #define IN_ADDRHASH_READER_FOREACH(__ia, __addr) \ 183 PSLIST_READER_FOREACH((__ia), &IN_IFADDR_HASH_PSLIST(__addr), \ 184 struct in_ifaddr, ia_hash_pslist_entry) 185 #define IN_ADDRHASH_WRITER_INSERT_HEAD(__ia) \ 186 PSLIST_WRITER_INSERT_HEAD( \ 187 &IN_IFADDR_HASH_PSLIST((__ia)->ia_addr.sin_addr.s_addr), \ 188 (__ia), ia_hash_pslist_entry) 189 #define IN_ADDRHASH_WRITER_REMOVE(__ia) \ 190 PSLIST_WRITER_REMOVE((__ia), ia_hash_pslist_entry) 191 #define IN_ADDRHASH_ENTRY_INIT(__ia) \ 192 PSLIST_ENTRY_INIT((__ia), ia_hash_pslist_entry); 193 #define IN_ADDRHASH_ENTRY_DESTROY(__ia) \ 194 PSLIST_ENTRY_DESTROY((__ia), ia_hash_pslist_entry); 195 #define IN_ADDRHASH_READER_NEXT(__ia) \ 196 PSLIST_READER_NEXT((__ia), struct in_ifaddr, ia_hash_pslist_entry) 197 198 #define IN_ADDRLIST_ENTRY_INIT(__ia) \ 199 PSLIST_ENTRY_INIT((__ia), ia_pslist_entry) 200 #define IN_ADDRLIST_ENTRY_DESTROY(__ia) \ 201 PSLIST_ENTRY_DESTROY((__ia), ia_pslist_entry); 202 #define IN_ADDRLIST_READER_EMPTY() \ 203 (PSLIST_READER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \ 204 ia_pslist_entry) == NULL) 205 #define IN_ADDRLIST_READER_FIRST() \ 206 PSLIST_READER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \ 207 ia_pslist_entry) 208 #define IN_ADDRLIST_READER_NEXT(__ia) \ 209 PSLIST_READER_NEXT((__ia), struct in_ifaddr, ia_pslist_entry) 210 #define IN_ADDRLIST_READER_FOREACH(__ia) \ 211 PSLIST_READER_FOREACH((__ia), &in_ifaddrhead_pslist, \ 212 struct in_ifaddr, ia_pslist_entry) 213 #define IN_ADDRLIST_WRITER_INSERT_HEAD(__ia) \ 214 PSLIST_WRITER_INSERT_HEAD(&in_ifaddrhead_pslist, (__ia), \ 215 ia_pslist_entry) 216 #define IN_ADDRLIST_WRITER_REMOVE(__ia) \ 217 PSLIST_WRITER_REMOVE((__ia), ia_pslist_entry) 218 #define IN_ADDRLIST_WRITER_FOREACH(__ia) \ 219 PSLIST_WRITER_FOREACH((__ia), &in_ifaddrhead_pslist, \ 220 struct in_ifaddr, ia_pslist_entry) 221 #define IN_ADDRLIST_WRITER_FIRST() \ 222 PSLIST_WRITER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \ 223 ia_pslist_entry) 224 #define IN_ADDRLIST_WRITER_NEXT(__ia) \ 225 PSLIST_WRITER_NEXT((__ia), struct in_ifaddr, ia_pslist_entry) 226 #define IN_ADDRLIST_WRITER_INSERT_AFTER(__ia, __new) \ 227 PSLIST_WRITER_INSERT_AFTER((__ia), (__new), ia_pslist_entry) 228 #define IN_ADDRLIST_WRITER_EMPTY() \ 229 (PSLIST_WRITER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \ 230 ia_pslist_entry) == NULL) 231 #define IN_ADDRLIST_WRITER_INSERT_TAIL(__new) \ 232 do { \ 233 if (IN_ADDRLIST_WRITER_EMPTY()) { \ 234 IN_ADDRLIST_WRITER_INSERT_HEAD((__new)); \ 235 } else { \ 236 struct in_ifaddr *__ia; \ 237 IN_ADDRLIST_WRITER_FOREACH(__ia) { \ 238 if (IN_ADDRLIST_WRITER_NEXT(__ia) == NULL) { \ 239 IN_ADDRLIST_WRITER_INSERT_AFTER(__ia,\ 240 (__new)); \ 241 break; \ 242 } \ 243 } \ 244 } \ 245 } while (0) 246 247 extern const int inetctlerrmap[]; 248 249 /* 250 * Find whether an internet address (in_addr) belongs to one 251 * of our interfaces (in_ifaddr). NULL if the address isn't ours. 252 */ 253 static inline struct in_ifaddr * 254 in_get_ia(struct in_addr addr) 255 { 256 struct in_ifaddr *ia; 257 258 IN_ADDRHASH_READER_FOREACH(ia, addr.s_addr) { 259 if (in_hosteq(ia->ia_addr.sin_addr, addr)) 260 break; 261 } 262 263 return ia; 264 } 265 266 static inline struct in_ifaddr * 267 in_get_ia_psref(struct in_addr addr, struct psref *psref) 268 { 269 struct in_ifaddr *ia; 270 int s; 271 272 s = pserialize_read_enter(); 273 ia = in_get_ia(addr); 274 if (ia != NULL) 275 ia4_acquire(ia, psref); 276 pserialize_read_exit(s); 277 278 return ia; 279 } 280 281 /* 282 * Find whether an internet address (in_addr) belongs to a specified 283 * interface. NULL if the address isn't ours. 284 */ 285 static inline struct in_ifaddr * 286 in_get_ia_on_iface(struct in_addr addr, struct ifnet *ifp) 287 { 288 struct in_ifaddr *ia; 289 290 IN_ADDRHASH_READER_FOREACH(ia, addr.s_addr) { 291 if (in_hosteq(ia->ia_addr.sin_addr, addr) && 292 ia->ia_ifp == ifp) 293 break; 294 } 295 296 return ia; 297 } 298 299 static inline struct in_ifaddr * 300 in_get_ia_on_iface_psref(struct in_addr addr, struct ifnet *ifp, struct psref *psref) 301 { 302 struct in_ifaddr *ia; 303 int s; 304 305 s = pserialize_read_enter(); 306 ia = in_get_ia_on_iface(addr, ifp); 307 if (ia != NULL) 308 ia4_acquire(ia, psref); 309 pserialize_read_exit(s); 310 311 return ia; 312 } 313 314 /* 315 * Find an internet address structure (in_ifaddr) corresponding 316 * to a given interface (ifnet structure). 317 */ 318 static inline struct in_ifaddr * 319 in_get_ia_from_ifp(struct ifnet *ifp) 320 { 321 struct ifaddr *ifa; 322 323 IFADDR_READER_FOREACH(ifa, ifp) { 324 if (ifa->ifa_addr->sa_family == AF_INET) 325 break; 326 } 327 328 return ifatoia(ifa); 329 } 330 331 static inline struct in_ifaddr * 332 in_get_ia_from_ifp_psref(struct ifnet *ifp, struct psref *psref) 333 { 334 struct in_ifaddr *ia; 335 int s; 336 337 s = pserialize_read_enter(); 338 ia = in_get_ia_from_ifp(ifp); 339 if (ia != NULL) 340 ia4_acquire(ia, psref); 341 pserialize_read_exit(s); 342 343 return ia; 344 } 345 346 #include <netinet/in_selsrc.h> 347 /* 348 * IPv4 per-interface state. 349 */ 350 struct in_ifinfo { 351 struct lltable *ii_llt; /* ARP state */ 352 struct in_ifsysctl *ii_selsrc; 353 }; 354 355 #endif /* _KERNEL */ 356 357 /* 358 * Internet multicast address structure. There is one of these for each IP 359 * multicast group to which this host belongs on a given network interface. 360 * They are kept in a linked list, rooted in the interface's in_ifaddr 361 * structure. 362 */ 363 struct router_info; 364 365 struct in_multi { 366 LIST_ENTRY(in_multi) inm_list; /* list of multicast addresses */ 367 struct router_info *inm_rti; /* router version info */ 368 struct ifnet *inm_ifp; /* back pointer to ifnet */ 369 struct in_addr inm_addr; /* IP multicast address */ 370 u_int inm_refcount; /* no. membership claims by sockets */ 371 u_int inm_timer; /* IGMP membership report timer */ 372 u_int inm_state; /* state of membership */ 373 }; 374 375 #ifdef _KERNEL 376 377 #include <net/pktqueue.h> 378 379 extern pktqueue_t *ip_pktq; 380 381 extern int ip_dad_count; /* Duplicate Address Detection probes */ 382 #if defined(INET) && NARP > 0 383 extern int arp_debug; 384 #define arplog(level, fmt, args...) \ 385 do { if (arp_debug) log(level, "%s: " fmt, __func__, ##args);} while (0) 386 #else 387 #define arplog(level, fmt, args...) 388 #endif 389 390 /* 391 * Structure used by functions below to remember position when stepping 392 * through all of the in_multi records. 393 */ 394 struct in_multistep { 395 int i_n; 396 struct in_multi *i_inm; 397 }; 398 399 bool in_multi_group(struct in_addr, struct ifnet *, int); 400 struct in_multi *in_first_multi(struct in_multistep *); 401 struct in_multi *in_next_multi(struct in_multistep *); 402 struct in_multi *in_lookup_multi(struct in_addr, struct ifnet *); 403 struct in_multi *in_addmulti(struct in_addr *, struct ifnet *); 404 void in_delmulti(struct in_multi *); 405 406 void in_multi_lock(int); 407 void in_multi_unlock(void); 408 int in_multi_lock_held(void); 409 410 struct ifaddr; 411 412 int in_ifinit(struct ifnet *, struct in_ifaddr *, 413 const struct sockaddr_in *, const struct sockaddr_in *, int); 414 void in_savemkludge(struct in_ifaddr *); 415 void in_restoremkludge(struct in_ifaddr *, struct ifnet *); 416 void in_purgemkludge(struct ifnet *); 417 void in_setmaxmtu(void); 418 const char *in_fmtaddr(struct in_addr); 419 int in_control(struct socket *, u_long, void *, struct ifnet *); 420 void in_purgeaddr(struct ifaddr *); 421 void in_purgeif(struct ifnet *); 422 int ipflow_fastforward(struct mbuf *); 423 424 struct ipid_state; 425 typedef struct ipid_state ipid_state_t; 426 427 ipid_state_t * ip_id_init(void); 428 void ip_id_fini(ipid_state_t *); 429 uint16_t ip_randomid(ipid_state_t *, uint16_t); 430 431 extern ipid_state_t * ip_ids; 432 extern uint16_t ip_id; 433 extern int ip_do_randomid; 434 435 /* 436 * ip_newid_range: "allocate" num contiguous IP IDs. 437 * 438 * => Return the first ID. 439 */ 440 static __inline uint16_t 441 ip_newid_range(const struct in_ifaddr *ia, u_int num) 442 { 443 uint16_t id; 444 445 if (ip_do_randomid) { 446 /* XXX ignore num */ 447 return ip_randomid(ip_ids, ia ? ia->ia_idsalt : 0); 448 } 449 450 /* Never allow an IP ID of 0 (detect wrap). */ 451 if ((uint16_t)(ip_id + num) < ip_id) { 452 ip_id = 1; 453 } 454 id = htons(ip_id); 455 ip_id += num; 456 return id; 457 } 458 459 static __inline uint16_t 460 ip_newid(const struct in_ifaddr *ia) 461 { 462 463 return ip_newid_range(ia, 1); 464 } 465 466 #ifdef SYSCTLFN_PROTO 467 int sysctl_inpcblist(SYSCTLFN_PROTO); 468 #endif 469 470 #define LLTABLE(ifp) \ 471 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt 472 473 #endif /* !_KERNEL */ 474 475 /* INET6 stuff */ 476 #include <netinet6/in6_var.h> 477 478 #endif /* !_NETINET_IN_VAR_H_ */ 479
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