master
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1985, 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 * @(#)in_var.h 8.2 (Berkeley) 1/9/95
32 */
33
34#ifndef _NETINET_IN_VAR_H_
35#define _NETINET_IN_VAR_H_
36
37/*
38 * Argument structure for SIOCAIFADDR.
39 */
40struct in_aliasreq {
41 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
42 struct sockaddr_in ifra_addr;
43 struct sockaddr_in ifra_broadaddr;
44#define ifra_dstaddr ifra_broadaddr
45 struct sockaddr_in ifra_mask;
46 int ifra_vhid;
47};
48
49#ifdef _KERNEL
50#include <sys/queue.h>
51#include <sys/fnv_hash.h>
52#include <sys/tree.h>
53
54struct igmp_ifsoftc;
55struct in_multi;
56struct lltable;
57SLIST_HEAD(in_multi_head, in_multi);
58
59/*
60 * IPv4 per-interface state.
61 */
62struct in_ifinfo {
63 struct lltable *ii_llt; /* ARP state */
64 struct igmp_ifsoftc *ii_igmp; /* IGMP state */
65 struct in_multi *ii_allhosts; /* 224.0.0.1 membership */
66};
67
68/*
69 * Interface address, Internet version. One of these structures
70 * is allocated for each Internet address on an interface.
71 * The ifaddr structure contains the protocol-independent part
72 * of the structure and is assumed to be first.
73 */
74struct in_ifaddr {
75 struct ifaddr ia_ifa; /* protocol-independent info */
76#define ia_ifp ia_ifa.ifa_ifp
77#define ia_flags ia_ifa.ifa_flags
78 /* ia_subnet{,mask} in host order */
79 u_long ia_subnet; /* subnet address */
80 u_long ia_subnetmask; /* mask of subnet */
81 CK_LIST_ENTRY(in_ifaddr) ia_hash; /* hash of internet addresses */
82 CK_STAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
83 struct sockaddr_in ia_addr; /* reserve space for interface name */
84 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
85#define ia_broadaddr ia_dstaddr
86 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
87 struct callout ia_garp_timer; /* timer for retransmitting GARPs */
88 int ia_garp_count; /* count of retransmitted GARPs */
89};
90
91/*
92 * Given a pointer to an in_ifaddr (ifaddr),
93 * return a pointer to the addr as a sockaddr_in.
94 */
95#define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
96#define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
97#define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask))
98
99#define IN_LNAOF(in, ifa) \
100 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
101
102#define LLTABLE(ifp) \
103 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
104/*
105 * Hash table for IP addresses.
106 */
107CK_STAILQ_HEAD(in_ifaddrhead, in_ifaddr);
108CK_LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
109
110VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
111VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
112VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */
113
114#define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl)
115#define V_in_ifaddrhead VNET(in_ifaddrhead)
116#define V_in_ifaddrhmask VNET(in_ifaddrhmask)
117
118#define INADDR_NHASH_LOG2 9
119#define INADDR_NHASH (1 << INADDR_NHASH_LOG2)
120#define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
121#define INADDR_HASH(x) \
122 (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
123
124/*
125 * Macro for finding the internet address structure (in_ifaddr)
126 * corresponding to one of our IP addresses (in_addr).
127 */
128#define INADDR_TO_IFADDR(addr, ia) \
129 /* struct in_addr addr; */ \
130 /* struct in_ifaddr *ia; */ \
131do { \
132 NET_EPOCH_ASSERT(); \
133 CK_LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
134 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
135 break; \
136} while (0)
137
138/*
139 * Macro for finding the interface (ifnet structure) corresponding to one
140 * of our IP addresses.
141 */
142#define INADDR_TO_IFP(addr, ifp) \
143 /* struct in_addr addr; */ \
144 /* struct ifnet *ifp; */ \
145{ \
146 struct in_ifaddr *ia; \
147\
148 INADDR_TO_IFADDR(addr, ia); \
149 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
150}
151
152/*
153 * Macro for finding the internet address structure (in_ifaddr) corresponding
154 * to a given interface (ifnet structure).
155 */
156#define IFP_TO_IA(ifp, ia) \
157 /* struct ifnet *ifp; */ \
158 /* struct in_ifaddr *ia; */ \
159do { \
160 NET_EPOCH_ASSERT(); \
161 for ((ia) = CK_STAILQ_FIRST(&V_in_ifaddrhead); \
162 (ia) != NULL && (ia)->ia_ifp != (ifp); \
163 (ia) = CK_STAILQ_NEXT((ia), ia_link)) \
164 continue; \
165} while (0)
166
167/*
168 * Legacy IPv4 IGMP per-link structure.
169 */
170struct router_info {
171 struct ifnet *rti_ifp;
172 int rti_type; /* type of router which is querier on this interface */
173 int rti_time; /* # of slow timeouts since last old query */
174 SLIST_ENTRY(router_info) rti_list;
175};
176
177/*
178 * IPv4 multicast IGMP-layer source entry.
179 */
180struct ip_msource {
181 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
182 in_addr_t ims_haddr; /* host byte order */
183 struct ims_st {
184 uint16_t ex; /* # of exclusive members */
185 uint16_t in; /* # of inclusive members */
186 } ims_st[2]; /* state at t0, t1 */
187 uint8_t ims_stp; /* pending query */
188};
189
190/*
191 * IPv4 multicast PCB-layer source entry.
192 */
193struct in_msource {
194 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
195 in_addr_t ims_haddr; /* host byte order */
196 uint8_t imsl_st[2]; /* state before/at commit */
197};
198
199RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */
200
201static __inline int
202ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
203{
204
205 if (a->ims_haddr < b->ims_haddr)
206 return (-1);
207 if (a->ims_haddr == b->ims_haddr)
208 return (0);
209 return (1);
210}
211RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
212
213/*
214 * IPv4 multicast PCB-layer group filter descriptor.
215 */
216struct in_mfilter {
217 struct ip_msource_tree imf_sources; /* source list for (S,G) */
218 u_long imf_nsrc; /* # of source entries */
219 uint8_t imf_st[2]; /* state before/at commit */
220 struct in_multi *imf_inm; /* associated multicast address */
221 STAILQ_ENTRY(in_mfilter) imf_entry; /* list entry */
222};
223
224/*
225 * Helper types and functions for IPv4 multicast filters.
226 */
227STAILQ_HEAD(ip_mfilter_head, in_mfilter);
228
229struct in_mfilter *ip_mfilter_alloc(int mflags, int st0, int st1);
230void ip_mfilter_free(struct in_mfilter *);
231
232static inline void
233ip_mfilter_init(struct ip_mfilter_head *head)
234{
235
236 STAILQ_INIT(head);
237}
238
239static inline struct in_mfilter *
240ip_mfilter_first(const struct ip_mfilter_head *head)
241{
242
243 return (STAILQ_FIRST(head));
244}
245
246static inline void
247ip_mfilter_insert(struct ip_mfilter_head *head, struct in_mfilter *imf)
248{
249
250 STAILQ_INSERT_TAIL(head, imf, imf_entry);
251}
252
253static inline void
254ip_mfilter_remove(struct ip_mfilter_head *head, struct in_mfilter *imf)
255{
256
257 STAILQ_REMOVE(head, imf, in_mfilter, imf_entry);
258}
259
260#define IP_MFILTER_FOREACH(imf, head) \
261 STAILQ_FOREACH(imf, head, imf_entry)
262
263static inline size_t
264ip_mfilter_count(struct ip_mfilter_head *head)
265{
266 struct in_mfilter *imf;
267 size_t num = 0;
268
269 STAILQ_FOREACH(imf, head, imf_entry)
270 num++;
271 return (num);
272}
273
274/*
275 * IPv4 group descriptor.
276 *
277 * For every entry on an ifnet's if_multiaddrs list which represents
278 * an IP multicast group, there is one of these structures.
279 *
280 * If any source filters are present, then a node will exist in the RB-tree
281 * to permit fast lookup by source whenever an operation takes place.
282 * This permits pre-order traversal when we issue reports.
283 * Source filter trees are kept separately from the socket layer to
284 * greatly simplify locking.
285 *
286 * When IGMPv3 is active, inm_timer is the response to group query timer.
287 * The state-change timer inm_sctimer is separate; whenever state changes
288 * for the group the state change record is generated and transmitted,
289 * and kept if retransmissions are necessary.
290 *
291 * FUTURE: inm_link is now only used when groups are being purged
292 * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
293 * because it is at the very start of the struct, we can't do this
294 * w/o breaking the ABI for ifmcstat.
295 */
296struct in_multi {
297 LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */
298 struct in_addr inm_addr; /* IP multicast address, convenience */
299 struct ifnet *inm_ifp; /* back pointer to ifnet */
300 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
301 u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */
302 u_int inm_state; /* state of the membership */
303 void *inm_rti; /* unused, legacy field */
304 u_int inm_refcount; /* reference count */
305
306 /* New fields for IGMPv3 follow. */
307 struct igmp_ifsoftc *inm_igi; /* IGMP info */
308 SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */
309 struct ip_msource_tree inm_srcs; /* tree of sources */
310 u_long inm_nsrc; /* # of tree entries */
311
312 struct mbufq inm_scq; /* queue of pending
313 * state-change packets */
314 struct timeval inm_lastgsrtv; /* Time of last G-S-R query */
315 uint16_t inm_sctimer; /* state-change timer */
316 uint16_t inm_scrv; /* state-change rexmit count */
317
318 /*
319 * SSM state counters which track state at T0 (the time the last
320 * state-change report's RV timer went to zero) and T1
321 * (time of pending report, i.e. now).
322 * Used for computing IGMPv3 state-change reports. Several refcounts
323 * are maintained here to optimize for common use-cases.
324 */
325 struct inm_st {
326 uint16_t iss_fmode; /* IGMP filter mode */
327 uint16_t iss_asm; /* # of ASM listeners */
328 uint16_t iss_ex; /* # of exclusive members */
329 uint16_t iss_in; /* # of inclusive members */
330 uint16_t iss_rec; /* # of recorded sources */
331 } inm_st[2]; /* state at t0, t1 */
332};
333
334/*
335 * Helper function to derive the filter mode on a source entry
336 * from its internal counters. Predicates are:
337 * A source is only excluded if all listeners exclude it.
338 * A source is only included if no listeners exclude it,
339 * and at least one listener includes it.
340 * May be used by ifmcstat(8).
341 */
342static __inline uint8_t
343ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
344 uint8_t t)
345{
346
347 t = !!t;
348 if (inm->inm_st[t].iss_ex > 0 &&
349 inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
350 return (MCAST_EXCLUDE);
351 else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
352 return (MCAST_INCLUDE);
353 return (MCAST_UNDEFINED);
354}
355
356#ifdef SYSCTL_DECL
357SYSCTL_DECL(_net_inet);
358SYSCTL_DECL(_net_inet_ip);
359SYSCTL_DECL(_net_inet_raw);
360#endif
361
362/*
363 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes
364 * before link layer multicast locks in the lock order. In most cases,
365 * consumers of IN_*_MULTI() macros should acquire the locks before
366 * calling them; users of the in_{add,del}multi() functions should not.
367 */
368extern struct mtx in_multi_list_mtx;
369extern struct sx in_multi_sx;
370
371#define IN_MULTI_LIST_LOCK() mtx_lock(&in_multi_list_mtx)
372#define IN_MULTI_LIST_UNLOCK() mtx_unlock(&in_multi_list_mtx)
373#define IN_MULTI_LIST_LOCK_ASSERT() mtx_assert(&in_multi_list_mtx, MA_OWNED)
374#define IN_MULTI_LIST_UNLOCK_ASSERT() mtx_assert(&in_multi_list_mtx, MA_NOTOWNED)
375
376#define IN_MULTI_LOCK() sx_xlock(&in_multi_sx)
377#define IN_MULTI_UNLOCK() sx_xunlock(&in_multi_sx)
378#define IN_MULTI_LOCK_ASSERT() sx_assert(&in_multi_sx, SA_XLOCKED)
379#define IN_MULTI_UNLOCK_ASSERT() sx_assert(&in_multi_sx, SA_XUNLOCKED)
380
381void inm_disconnect(struct in_multi *inm);
382
383/*
384 * Get the in_multi pointer from a ifmultiaddr.
385 * Returns NULL if ifmultiaddr is no longer valid.
386 */
387static __inline struct in_multi *
388inm_ifmultiaddr_get_inm(struct ifmultiaddr *ifma)
389{
390
391 NET_EPOCH_ASSERT();
392
393 return ((ifma->ifma_addr->sa_family != AF_INET ||
394 (ifma->ifma_flags & IFMA_F_ENQUEUED) == 0) ? NULL :
395 ifma->ifma_protospec);
396}
397
398/* Acquire an in_multi record. */
399static __inline void
400inm_acquire_locked(struct in_multi *inm)
401{
402
403 IN_MULTI_LIST_LOCK_ASSERT();
404 ++inm->inm_refcount;
405}
406
407static __inline void
408inm_acquire(struct in_multi *inm)
409{
410 IN_MULTI_LIST_LOCK();
411 inm_acquire_locked(inm);
412 IN_MULTI_LIST_UNLOCK();
413}
414
415static __inline void
416inm_rele_locked(struct in_multi_head *inmh, struct in_multi *inm)
417{
418 MPASS(inm->inm_refcount > 0);
419 IN_MULTI_LIST_LOCK_ASSERT();
420
421 if (--inm->inm_refcount == 0) {
422 MPASS(inmh != NULL);
423 inm_disconnect(inm);
424 inm->inm_ifma->ifma_protospec = NULL;
425 SLIST_INSERT_HEAD(inmh, inm, inm_nrele);
426 }
427}
428
429/*
430 * Return values for imo_multi_filter().
431 */
432#define MCAST_PASS 0 /* Pass */
433#define MCAST_NOTGMEMBER 1 /* This host not a member of group */
434#define MCAST_NOTSMEMBER 2 /* This host excluded source */
435#define MCAST_MUTED 3 /* [deprecated] */
436
437struct rib_head;
438struct ip_moptions;
439struct ucred;
440
441struct in_multi *inm_lookup_locked(struct ifnet *, const struct in_addr);
442struct in_multi *inm_lookup(struct ifnet *, const struct in_addr);
443int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
444 const struct sockaddr *, const struct sockaddr *);
445void inm_commit(struct in_multi *);
446void inm_clear_recorded(struct in_multi *);
447void inm_print(const struct in_multi *);
448int inm_record_source(struct in_multi *inm, const in_addr_t);
449void inm_release_deferred(struct in_multi *);
450void inm_release_list_deferred(struct in_multi_head *);
451void inm_release_wait(void *);
452int in_joingroup(struct ifnet *, const struct in_addr *,
453 /*const*/ struct in_mfilter *, struct in_multi **);
454int in_joingroup_locked(struct ifnet *, const struct in_addr *,
455 /*const*/ struct in_mfilter *, struct in_multi **);
456int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
457int in_leavegroup_locked(struct in_multi *,
458 /*const*/ struct in_mfilter *);
459int in_control(struct socket *, u_long, void *, struct ifnet *,
460 struct thread *);
461int in_control_ioctl(u_long, void *, struct ifnet *,
462 struct ucred *);
463int in_addprefix(struct in_ifaddr *);
464int in_scrubprefix(struct in_ifaddr *, u_int);
465void in_ifscrub_all(void);
466void ip_input(struct mbuf *);
467void ip_direct_input(struct mbuf *);
468void in_ifadown(struct ifaddr *ifa, int);
469struct mbuf *ip_tryforward(struct mbuf *);
470void *in_domifattach(struct ifnet *);
471void in_domifdetach(struct ifnet *, void *);
472struct rib_head *in_inithead(uint32_t fibnum);
473#ifdef VIMAGE
474void in_detachhead(struct rib_head *rh);
475#endif
476
477#endif /* _KERNEL */
478
479/* INET6 stuff */
480#include <netinet6/in6_var.h>
481
482#endif /* _NETINET_IN_VAR_H_ */