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