1/* $NetBSD: in_var.h,v 1.97 2018/11/29 09:51:20 ozaki-r 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 */
87struct 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
119static __inline void
120ia4_acquire(struct in_ifaddr *ia, struct psref *psref)
121{
122
123 KASSERT(ia != NULL);
124 ifa_acquire(&ia->ia_ifa, psref);
125}
126
127static __inline void
128ia4_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
137struct 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#ifdef _KERNEL
152
153/* Note: 61, 127, 251, 509, 1021, 2039 are good. */
154#ifndef IN_IFADDR_HASH_SIZE
155#define IN_IFADDR_HASH_SIZE 509
156#endif
157
158/*
159 * This is a bit unconventional, and wastes a little bit of space, but
160 * because we want a very even hash function we don't use & in_ifaddrhash
161 * here, but rather % the hash size, which should obviously be prime.
162 */
163
164#define IN_IFADDR_HASH(x) in_ifaddrhashtbl[(u_long)(x) % IN_IFADDR_HASH_SIZE]
165
166LIST_HEAD(in_ifaddrhashhead, in_ifaddr); /* Type of the hash head */
167TAILQ_HEAD(in_ifaddrhead, in_ifaddr); /* Type of the list head */
168
169extern u_long in_ifaddrhash; /* size of hash table - 1 */
170extern struct in_ifaddrhashhead *in_ifaddrhashtbl; /* Hash table head */
171extern struct in_ifaddrhead in_ifaddrhead; /* List head (in ip_input) */
172
173extern pserialize_t in_ifaddrhash_psz;
174extern struct pslist_head *in_ifaddrhashtbl_pslist;
175extern u_long in_ifaddrhash_pslist;
176extern struct pslist_head in_ifaddrhead_pslist;
177
178#define IN_IFADDR_HASH_PSLIST(x) \
179 in_ifaddrhashtbl_pslist[(u_long)(x) % IN_IFADDR_HASH_SIZE]
180
181#define IN_ADDRHASH_READER_FOREACH(__ia, __addr) \
182 PSLIST_READER_FOREACH((__ia), &IN_IFADDR_HASH_PSLIST(__addr), \
183 struct in_ifaddr, ia_hash_pslist_entry)
184#define IN_ADDRHASH_WRITER_INSERT_HEAD(__ia) \
185 PSLIST_WRITER_INSERT_HEAD( \
186 &IN_IFADDR_HASH_PSLIST((__ia)->ia_addr.sin_addr.s_addr), \
187 (__ia), ia_hash_pslist_entry)
188#define IN_ADDRHASH_WRITER_REMOVE(__ia) \
189 PSLIST_WRITER_REMOVE((__ia), ia_hash_pslist_entry)
190#define IN_ADDRHASH_ENTRY_INIT(__ia) \
191 PSLIST_ENTRY_INIT((__ia), ia_hash_pslist_entry);
192#define IN_ADDRHASH_ENTRY_DESTROY(__ia) \
193 PSLIST_ENTRY_DESTROY((__ia), ia_hash_pslist_entry);
194#define IN_ADDRHASH_READER_NEXT(__ia) \
195 PSLIST_READER_NEXT((__ia), struct in_ifaddr, ia_hash_pslist_entry)
196
197#define IN_ADDRLIST_ENTRY_INIT(__ia) \
198 PSLIST_ENTRY_INIT((__ia), ia_pslist_entry)
199#define IN_ADDRLIST_ENTRY_DESTROY(__ia) \
200 PSLIST_ENTRY_DESTROY((__ia), ia_pslist_entry);
201#define IN_ADDRLIST_READER_EMPTY() \
202 (PSLIST_READER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
203 ia_pslist_entry) == NULL)
204#define IN_ADDRLIST_READER_FIRST() \
205 PSLIST_READER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
206 ia_pslist_entry)
207#define IN_ADDRLIST_READER_NEXT(__ia) \
208 PSLIST_READER_NEXT((__ia), struct in_ifaddr, ia_pslist_entry)
209#define IN_ADDRLIST_READER_FOREACH(__ia) \
210 PSLIST_READER_FOREACH((__ia), &in_ifaddrhead_pslist, \
211 struct in_ifaddr, ia_pslist_entry)
212#define IN_ADDRLIST_WRITER_INSERT_HEAD(__ia) \
213 PSLIST_WRITER_INSERT_HEAD(&in_ifaddrhead_pslist, (__ia), \
214 ia_pslist_entry)
215#define IN_ADDRLIST_WRITER_REMOVE(__ia) \
216 PSLIST_WRITER_REMOVE((__ia), ia_pslist_entry)
217#define IN_ADDRLIST_WRITER_FOREACH(__ia) \
218 PSLIST_WRITER_FOREACH((__ia), &in_ifaddrhead_pslist, \
219 struct in_ifaddr, ia_pslist_entry)
220#define IN_ADDRLIST_WRITER_FIRST() \
221 PSLIST_WRITER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
222 ia_pslist_entry)
223#define IN_ADDRLIST_WRITER_NEXT(__ia) \
224 PSLIST_WRITER_NEXT((__ia), struct in_ifaddr, ia_pslist_entry)
225#define IN_ADDRLIST_WRITER_INSERT_AFTER(__ia, __new) \
226 PSLIST_WRITER_INSERT_AFTER((__ia), (__new), ia_pslist_entry)
227#define IN_ADDRLIST_WRITER_EMPTY() \
228 (PSLIST_WRITER_FIRST(&in_ifaddrhead_pslist, struct in_ifaddr, \
229 ia_pslist_entry) == NULL)
230#define IN_ADDRLIST_WRITER_INSERT_TAIL(__new) \
231 do { \
232 if (IN_ADDRLIST_WRITER_EMPTY()) { \
233 IN_ADDRLIST_WRITER_INSERT_HEAD((__new)); \
234 } else { \
235 struct in_ifaddr *__ia; \
236 IN_ADDRLIST_WRITER_FOREACH(__ia) { \
237 if (IN_ADDRLIST_WRITER_NEXT(__ia) == NULL) { \
238 IN_ADDRLIST_WRITER_INSERT_AFTER(__ia,\
239 (__new)); \
240 break; \
241 } \
242 } \
243 } \
244 } while (0)
245
246extern const int inetctlerrmap[];
247
248/*
249 * Find whether an internet address (in_addr) belongs to one
250 * of our interfaces (in_ifaddr). NULL if the address isn't ours.
251 */
252static __inline struct in_ifaddr *
253in_get_ia(struct in_addr addr)
254{
255 struct in_ifaddr *ia;
256
257 IN_ADDRHASH_READER_FOREACH(ia, addr.s_addr) {
258 if (in_hosteq(ia->ia_addr.sin_addr, addr))
259 break;
260 }
261
262 return ia;
263}
264
265static __inline struct in_ifaddr *
266in_get_ia_psref(struct in_addr addr, struct psref *psref)
267{
268 struct in_ifaddr *ia;
269 int s;
270
271 s = pserialize_read_enter();
272 ia = in_get_ia(addr);
273 if (ia != NULL)
274 ia4_acquire(ia, psref);
275 pserialize_read_exit(s);
276
277 return ia;
278}
279
280/*
281 * Find whether an internet address (in_addr) belongs to a specified
282 * interface. NULL if the address isn't ours.
283 */
284static __inline struct in_ifaddr *
285in_get_ia_on_iface(struct in_addr addr, struct ifnet *ifp)
286{
287 struct in_ifaddr *ia;
288
289 IN_ADDRHASH_READER_FOREACH(ia, addr.s_addr) {
290 if (in_hosteq(ia->ia_addr.sin_addr, addr) &&
291 ia->ia_ifp == ifp)
292 break;
293 }
294
295 return ia;
296}
297
298static __inline struct in_ifaddr *
299in_get_ia_on_iface_psref(struct in_addr addr, struct ifnet *ifp, struct psref *psref)
300{
301 struct in_ifaddr *ia;
302 int s;
303
304 s = pserialize_read_enter();
305 ia = in_get_ia_on_iface(addr, ifp);
306 if (ia != NULL)
307 ia4_acquire(ia, psref);
308 pserialize_read_exit(s);
309
310 return ia;
311}
312
313/*
314 * Find an internet address structure (in_ifaddr) corresponding
315 * to a given interface (ifnet structure).
316 */
317static __inline struct in_ifaddr *
318in_get_ia_from_ifp(struct ifnet *ifp)
319{
320 struct ifaddr *ifa;
321
322 IFADDR_READER_FOREACH(ifa, ifp) {
323 if (ifa->ifa_addr->sa_family == AF_INET)
324 break;
325 }
326
327 return ifatoia(ifa);
328}
329
330static __inline struct in_ifaddr *
331in_get_ia_from_ifp_psref(struct ifnet *ifp, struct psref *psref)
332{
333 struct in_ifaddr *ia;
334 int s;
335
336 s = pserialize_read_enter();
337 ia = in_get_ia_from_ifp(ifp);
338 if (ia != NULL)
339 ia4_acquire(ia, psref);
340 pserialize_read_exit(s);
341
342 return ia;
343}
344
345#include <netinet/in_selsrc.h>
346/*
347 * IPv4 per-interface state.
348 */
349struct in_ifinfo {
350 struct lltable *ii_llt; /* ARP state */
351 struct in_ifsysctl *ii_selsrc;
352};
353
354#endif /* _KERNEL */
355
356/*
357 * Internet multicast address structure. There is one of these for each IP
358 * multicast group to which this host belongs on a given network interface.
359 * They are kept in a linked list, rooted in the interface's in_ifaddr
360 * structure.
361 */
362struct router_info;
363
364struct in_multi {
365 LIST_ENTRY(in_multi) inm_list; /* list of multicast addresses */
366 struct router_info *inm_rti; /* router version info */
367 struct ifnet *inm_ifp; /* back pointer to ifnet */
368 struct in_addr inm_addr; /* IP multicast address */
369 u_int inm_refcount; /* no. membership claims by sockets */
370 u_int inm_timer; /* IGMP membership report timer */
371 u_int inm_state; /* state of membership */
372};
373
374#ifdef _KERNEL
375
376#include <net/pktqueue.h>
377
378extern pktqueue_t *ip_pktq;
379
380extern int ip_dad_count; /* Duplicate Address Detection probes */
381
382static inline bool
383ip_dad_enabled(void)
384{
385#if NARP > 0
386 return ip_dad_count > 0;
387#else
388 return false;
389#endif
390}
391
392#if defined(INET) && NARP > 0
393extern int arp_debug;
394#define ARPLOGADDR(a) IN_PRINT(_ipbuf, a)
395#define ARPLOG(level, fmt, args...) \
396 do { \
397 char _ipbuf[INET_ADDRSTRLEN]; \
398 (void)_ipbuf; \
399 if (arp_debug) \
400 log(level, "%s: " fmt, __func__, ##args); \
401 } while (/*CONSTCOND*/0)
402#else
403#define ARPLOG(level, fmt, args...)
404#endif
405
406/*
407 * Structure used by functions below to remember position when stepping
408 * through all of the in_multi records.
409 */
410struct in_multistep {
411 int i_n;
412 struct in_multi *i_inm;
413};
414
415bool in_multi_group(struct in_addr, struct ifnet *, int);
416struct in_multi *in_first_multi(struct in_multistep *);
417struct in_multi *in_next_multi(struct in_multistep *);
418struct in_multi *in_lookup_multi(struct in_addr, struct ifnet *);
419struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
420void in_delmulti(struct in_multi *);
421
422void in_multi_lock(int);
423void in_multi_unlock(void);
424int in_multi_lock_held(void);
425
426struct ifaddr;
427
428int in_ifinit(struct ifnet *, struct in_ifaddr *,
429 const struct sockaddr_in *, const struct sockaddr_in *, int);
430void in_savemkludge(struct in_ifaddr *);
431void in_restoremkludge(struct in_ifaddr *, struct ifnet *);
432void in_purgemkludge(struct ifnet *);
433void in_setmaxmtu(void);
434int in_control(struct socket *, u_long, void *, struct ifnet *);
435void in_purgeaddr(struct ifaddr *);
436void in_purgeif(struct ifnet *);
437void in_addrhash_insert(struct in_ifaddr *);
438void in_addrhash_remove(struct in_ifaddr *);
439int ipflow_fastforward(struct mbuf *);
440
441struct ipid_state;
442typedef struct ipid_state ipid_state_t;
443
444ipid_state_t * ip_id_init(void);
445void ip_id_fini(ipid_state_t *);
446uint16_t ip_randomid(ipid_state_t *, uint16_t);
447
448extern ipid_state_t * ip_ids;
449extern uint16_t ip_id;
450extern int ip_do_randomid;
451
452/*
453 * ip_newid_range: "allocate" num contiguous IP IDs.
454 *
455 * => Return the first ID.
456 */
457static __inline uint16_t
458ip_newid_range(const struct in_ifaddr *ia, u_int num)
459{
460 uint16_t id;
461
462 if (ip_do_randomid) {
463 /* XXX ignore num */
464 return ip_randomid(ip_ids, ia ? ia->ia_idsalt : 0);
465 }
466
467 /* Never allow an IP ID of 0 (detect wrap). */
468 if ((uint16_t)(ip_id + num) < ip_id) {
469 ip_id = 1;
470 }
471 id = htons(ip_id);
472 ip_id += num;
473 return id;
474}
475
476static __inline uint16_t
477ip_newid(const struct in_ifaddr *ia)
478{
479
480 return ip_newid_range(ia, 1);
481}
482
483#ifdef SYSCTLFN_PROTO
484int sysctl_inpcblist(SYSCTLFN_PROTO);
485#endif
486
487#define LLTABLE(ifp) \
488 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
489
490#endif /* !_KERNEL */
491
492/* INET6 stuff */
493#include <netinet6/in6_var.h>
494
495#endif /* !_NETINET_IN_VAR_H_ */
496