1 /* $NetBSD: in_var.h,v 1.103 2022/11/19 08:00:51 yamt 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 struct in_nbrinfo {
119 char ifname[IFNAMSIZ]; /* if name, e.g. "en0" */
120 struct in_addr addr; /* IPv4 address of the neighbor */
121 long asked; /* number of queries already sent for this addr */
122 int state; /* reachability state */
123 int expire; /* lifetime for NDP state transition */
124 };
125
126 #ifdef _KERNEL
127 static __inline void
ia4_acquire(struct in_ifaddr * ia,struct psref * psref)128 ia4_acquire(struct in_ifaddr *ia, struct psref *psref)
129 {
130
131 KASSERT(ia != NULL);
132 ifa_acquire(&ia->ia_ifa, psref);
133 }
134
135 static __inline void
ia4_release(struct in_ifaddr * ia,struct psref * psref)136 ia4_release(struct in_ifaddr *ia, struct psref *psref)
137 {
138
139 if (ia == NULL)
140 return;
141 ifa_release(&ia->ia_ifa, psref);
142 }
143 #endif
144
145 struct in_aliasreq {
146 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
147 struct sockaddr_in ifra_addr;
148 struct sockaddr_in ifra_dstaddr;
149 #define ifra_broadaddr ifra_dstaddr
150 struct sockaddr_in ifra_mask;
151 };
152
153 /*
154 * Given a pointer to an in_ifaddr (ifaddr),
155 * return a pointer to the addr as a sockaddr_in.
156 */
157 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
158
159 #ifdef _KERNEL
160
161 /* Note: 61, 127, 251, 509, 1021, 2039 are good. */
162 #ifndef IN_IFADDR_HASH_SIZE
163 #define IN_IFADDR_HASH_SIZE 509
164 #endif
165
166 /*
167 * This is a bit unconventional, and wastes a little bit of space, but
168 * because we want a very even hash function we don't use & in_ifaddrhash
169 * here, but rather % the hash size, which should obviously be prime.
170 */
171
172 #define IN_IFADDR_HASH(x) in_ifaddrhashtbl[(u_long)(x) % IN_IFADDR_HASH_SIZE]
173
174 LIST_HEAD(in_ifaddrhashhead, in_ifaddr); /* Type of the hash head */
175 TAILQ_HEAD(in_ifaddrhead, in_ifaddr); /* Type of the list head */
176
177 extern u_long in_ifaddrhash; /* size of hash table - 1 */
178 extern struct in_ifaddrhashhead *in_ifaddrhashtbl; /* Hash table head */
179 extern struct in_ifaddrhead in_ifaddrhead; /* List head (in ip_input) */
180
181 extern pserialize_t in_ifaddrhash_psz;
182 extern struct pslist_head *in_ifaddrhashtbl_pslist;
183 extern u_long in_ifaddrhash_pslist;
184 extern struct pslist_head in_ifaddrhead_pslist;
185
186 #define IN_IFADDR_HASH_PSLIST(x) \
187 in_ifaddrhashtbl_pslist[(u_long)(x) % IN_IFADDR_HASH_SIZE]
188
189 #define IN_ADDRHASH_READER_FOREACH(__ia, __addr) \
190 PSLIST_READER_FOREACH((__ia), &IN_IFADDR_HASH_PSLIST(__addr), \
191 struct in_ifaddr, ia_hash_pslist_entry)
192 #define IN_ADDRHASH_WRITER_INSERT_HEAD(__ia) \
193 PSLIST_WRITER_INSERT_HEAD( \
194 &IN_IFADDR_HASH_PSLIST((__ia)->ia_addr.sin_addr.s_addr), \
195 (__ia), ia_hash_pslist_entry)
196 #define IN_ADDRHASH_WRITER_REMOVE(__ia) \
197 PSLIST_WRITER_REMOVE((__ia), ia_hash_pslist_entry)
198 #define IN_ADDRHASH_ENTRY_INIT(__ia) \
199 PSLIST_ENTRY_INIT((__ia), ia_hash_pslist_entry);
200 #define IN_ADDRHASH_ENTRY_DESTROY(__ia) \
201 PSLIST_ENTRY_DESTROY((__ia), ia_hash_pslist_entry);
202 #define IN_ADDRHASH_READER_NEXT(__ia) \
203 PSLIST_READER_NEXT((__ia), struct in_ifaddr, ia_hash_pslist_entry)
204
205 #define IN_ADDRLIST_ENTRY_INIT(__ia) \
206 PSLIST_ENTRY_INIT((__ia), ia_pslist_entry)
207 #define IN_ADDRLIST_ENTRY_DESTROY(__ia) \
208 PSLIST_ENTRY_DESTROY((__ia), ia_pslist_entry);
209 #define IN_ADDRLIST_READER_EMPTY() \
210 (PSLIST_READER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
211 ia_pslist_entry) == NULL)
212 #define IN_ADDRLIST_READER_FIRST() \
213 PSLIST_READER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
214 ia_pslist_entry)
215 #define IN_ADDRLIST_READER_NEXT(__ia) \
216 PSLIST_READER_NEXT((__ia), struct in_ifaddr, ia_pslist_entry)
217 #define IN_ADDRLIST_READER_FOREACH(__ia) \
218 PSLIST_READER_FOREACH((__ia), &in_ifaddrhead_pslist, \
219 struct in_ifaddr, ia_pslist_entry)
220 #define IN_ADDRLIST_WRITER_INSERT_HEAD(__ia) \
221 PSLIST_WRITER_INSERT_HEAD(&in_ifaddrhead_pslist, (__ia), \
222 ia_pslist_entry)
223 #define IN_ADDRLIST_WRITER_REMOVE(__ia) \
224 PSLIST_WRITER_REMOVE((__ia), ia_pslist_entry)
225 #define IN_ADDRLIST_WRITER_FOREACH(__ia) \
226 PSLIST_WRITER_FOREACH((__ia), &in_ifaddrhead_pslist, \
227 struct in_ifaddr, ia_pslist_entry)
228 #define IN_ADDRLIST_WRITER_FIRST() \
229 PSLIST_WRITER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
230 ia_pslist_entry)
231 #define IN_ADDRLIST_WRITER_NEXT(__ia) \
232 PSLIST_WRITER_NEXT((__ia), struct in_ifaddr, ia_pslist_entry)
233 #define IN_ADDRLIST_WRITER_INSERT_AFTER(__ia, __new) \
234 PSLIST_WRITER_INSERT_AFTER((__ia), (__new), ia_pslist_entry)
235 #define IN_ADDRLIST_WRITER_EMPTY() \
236 (PSLIST_WRITER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
237 ia_pslist_entry) == NULL)
238 #define IN_ADDRLIST_WRITER_INSERT_TAIL(__new) \
239 do { \
240 if (IN_ADDRLIST_WRITER_EMPTY()) { \
241 IN_ADDRLIST_WRITER_INSERT_HEAD((__new)); \
242 } else { \
243 struct in_ifaddr *__ia; \
244 IN_ADDRLIST_WRITER_FOREACH(__ia) { \
245 if (IN_ADDRLIST_WRITER_NEXT(__ia) == NULL) { \
246 IN_ADDRLIST_WRITER_INSERT_AFTER(__ia,\
247 (__new)); \
248 break; \
249 } \
250 } \
251 } \
252 } while (0)
253
254 extern const int inetctlerrmap[];
255
256 /*
257 * Find whether an internet address (in_addr) belongs to one
258 * of our interfaces (in_ifaddr). NULL if the address isn't ours.
259 */
260 static __inline struct in_ifaddr *
in_get_ia(struct in_addr addr)261 in_get_ia(struct in_addr addr)
262 {
263 struct in_ifaddr *ia;
264
265 IN_ADDRHASH_READER_FOREACH(ia, addr.s_addr) {
266 if (in_hosteq(ia->ia_addr.sin_addr, addr))
267 break;
268 }
269
270 return ia;
271 }
272
273 static __inline struct in_ifaddr *
in_get_ia_psref(struct in_addr addr,struct psref * psref)274 in_get_ia_psref(struct in_addr addr, struct psref *psref)
275 {
276 struct in_ifaddr *ia;
277 int s;
278
279 s = pserialize_read_enter();
280 ia = in_get_ia(addr);
281 if (ia != NULL)
282 ia4_acquire(ia, psref);
283 pserialize_read_exit(s);
284
285 return ia;
286 }
287
288 /*
289 * Find whether an internet address (in_addr) belongs to a specified
290 * interface. NULL if the address isn't ours.
291 */
292 static __inline struct in_ifaddr *
in_get_ia_on_iface(struct in_addr addr,struct ifnet * ifp)293 in_get_ia_on_iface(struct in_addr addr, struct ifnet *ifp)
294 {
295 struct in_ifaddr *ia;
296
297 IN_ADDRHASH_READER_FOREACH(ia, addr.s_addr) {
298 if (in_hosteq(ia->ia_addr.sin_addr, addr) &&
299 ia->ia_ifp == ifp)
300 break;
301 }
302
303 return ia;
304 }
305
306 static __inline struct in_ifaddr *
in_get_ia_on_iface_psref(struct in_addr addr,struct ifnet * ifp,struct psref * psref)307 in_get_ia_on_iface_psref(struct in_addr addr, struct ifnet *ifp, struct psref *psref)
308 {
309 struct in_ifaddr *ia;
310 int s;
311
312 s = pserialize_read_enter();
313 ia = in_get_ia_on_iface(addr, ifp);
314 if (ia != NULL)
315 ia4_acquire(ia, psref);
316 pserialize_read_exit(s);
317
318 return ia;
319 }
320
321 /*
322 * Find an internet address structure (in_ifaddr) corresponding
323 * to a given interface (ifnet structure).
324 */
325 static __inline struct in_ifaddr *
in_get_ia_from_ifp(struct ifnet * ifp)326 in_get_ia_from_ifp(struct ifnet *ifp)
327 {
328 struct ifaddr *ifa;
329
330 IFADDR_READER_FOREACH(ifa, ifp) {
331 if (ifa->ifa_addr->sa_family == AF_INET)
332 break;
333 }
334
335 return ifatoia(ifa);
336 }
337
338 static __inline struct in_ifaddr *
in_get_ia_from_ifp_psref(struct ifnet * ifp,struct psref * psref)339 in_get_ia_from_ifp_psref(struct ifnet *ifp, struct psref *psref)
340 {
341 struct in_ifaddr *ia;
342 int s;
343
344 s = pserialize_read_enter();
345 ia = in_get_ia_from_ifp(ifp);
346 if (ia != NULL)
347 ia4_acquire(ia, psref);
348 pserialize_read_exit(s);
349
350 return ia;
351 }
352
353 #include <netinet/in_selsrc.h>
354 /*
355 * IPv4 per-interface state.
356 */
357 struct in_ifinfo {
358 struct lltable *ii_llt; /* ARP state */
359 struct in_ifsysctl *ii_selsrc;
360 #ifdef MBUFTRACE
361 struct mowner ii_mowner;
362 #endif
363 };
364
365 #endif /* _KERNEL */
366
367 /*
368 * Internet multicast address structure. There is one of these for each IP
369 * multicast group to which this host belongs on a given network interface.
370 * They are kept in a linked list, rooted in the interface's in_ifaddr
371 * structure.
372 */
373 struct router_info;
374
375 struct in_multi {
376 LIST_ENTRY(in_multi) inm_list; /* list of multicast addresses */
377 struct router_info *inm_rti; /* router version info */
378 struct ifnet *inm_ifp; /* back pointer to ifnet */
379 struct in_addr inm_addr; /* IP multicast address */
380 u_int inm_refcount; /* no. membership claims by sockets */
381 u_int inm_timer; /* IGMP membership report timer */
382 u_int inm_state; /* state of membership */
383 };
384
385 #ifdef _KERNEL
386
387 #include <net/pktqueue.h>
388 #include <sys/cprng.h>
389
390 extern pktqueue_t *ip_pktq;
391
392 extern int ip_dad_count; /* Duplicate Address Detection probes */
393
394 static inline bool
ip_dad_enabled(void)395 ip_dad_enabled(void)
396 {
397 #if NARP > 0
398 return ip_dad_count > 0;
399 #else
400 return false;
401 #endif
402 }
403
404 #if defined(INET) && NARP > 0
405 extern int arp_debug;
406 #define ARPLOGADDR(a) IN_PRINT(_ipbuf, a)
407 #define ARPLOG(level, fmt, args...) \
408 do { \
409 char _ipbuf[INET_ADDRSTRLEN]; \
410 (void)_ipbuf; \
411 if (arp_debug) \
412 log(level, "%s: " fmt, __func__, ##args); \
413 } while (/*CONSTCOND*/0)
414 #else
415 #define ARPLOG(level, fmt, args...)
416 #endif
417
418 /*
419 * Structure used by functions below to remember position when stepping
420 * through all of the in_multi records.
421 */
422 struct in_multistep {
423 int i_n;
424 struct in_multi *i_inm;
425 };
426
427 bool in_multi_group(struct in_addr, struct ifnet *, int);
428 struct in_multi *in_first_multi(struct in_multistep *);
429 struct in_multi *in_next_multi(struct in_multistep *);
430 struct in_multi *in_lookup_multi(struct in_addr, struct ifnet *);
431 struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
432 void in_delmulti(struct in_multi *);
433
434 void in_multi_lock(int);
435 void in_multi_unlock(void);
436 int in_multi_lock_held(void);
437
438 struct ifaddr;
439
440 int in_ifinit(struct ifnet *, struct in_ifaddr *,
441 const struct sockaddr_in *, const struct sockaddr_in *, int);
442 void in_savemkludge(struct in_ifaddr *);
443 void in_restoremkludge(struct in_ifaddr *, struct ifnet *);
444 void in_purgemkludge(struct ifnet *);
445 void in_setmaxmtu(void);
446 int in_control(struct socket *, u_long, void *, struct ifnet *);
447 void in_purgeaddr(struct ifaddr *);
448 void in_purgeif(struct ifnet *);
449 void in_addrhash_insert(struct in_ifaddr *);
450 void in_addrhash_remove(struct in_ifaddr *);
451 int ipflow_fastforward(struct mbuf *);
452
453 extern uint16_t ip_id;
454 extern int ip_do_randomid;
455
456 static __inline uint16_t
ip_randomid(void)457 ip_randomid(void)
458 {
459
460 uint16_t id = (uint16_t)cprng_fast32();
461 return id ? id : 1;
462 }
463
464 /*
465 * ip_newid_range: "allocate" num contiguous IP IDs.
466 *
467 * => Return the first ID.
468 */
469 static __inline uint16_t
ip_newid_range(const struct in_ifaddr * ia,u_int num)470 ip_newid_range(const struct in_ifaddr *ia, u_int num)
471 {
472 uint16_t id;
473
474 if (ip_do_randomid) {
475 /* XXX ignore num */
476 return ip_randomid();
477 }
478
479 /* Never allow an IP ID of 0 (detect wrap). */
480 if ((uint16_t)(ip_id + num) < ip_id) {
481 ip_id = 1;
482 }
483 id = htons(ip_id);
484 ip_id += num;
485 return id;
486 }
487
488 static __inline uint16_t
ip_newid(const struct in_ifaddr * ia)489 ip_newid(const struct in_ifaddr *ia)
490 {
491
492 return ip_newid_range(ia, 1);
493 }
494
495 #ifdef SYSCTLFN_PROTO
496 int sysctl_inpcblist(SYSCTLFN_PROTO);
497 #endif
498
499 #define LLTABLE(ifp) \
500 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
501
502 #endif /* !_KERNEL */
503
504 /* INET6 stuff */
505 #include <netinet6/in6_var.h>
506
507 #endif /* !_NETINET_IN_VAR_H_ */
508