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
32 #ifndef _NETINET_IN_VAR_H_
33 #define _NETINET_IN_VAR_H_
34
35 /*
36 * Argument structure for SIOCAIFADDR.
37 */
38 struct in_aliasreq {
39 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
40 struct sockaddr_in ifra_addr;
41 struct sockaddr_in ifra_broadaddr;
42 #define ifra_dstaddr ifra_broadaddr
43 struct sockaddr_in ifra_mask;
44 int ifra_vhid;
45 };
46
47 #ifdef _KERNEL
48 #include <sys/queue.h>
49 #include <sys/fnv_hash.h>
50 #include <sys/tree.h>
51
52 struct igmp_ifsoftc;
53 struct in_multi;
54 struct lltable;
55 SLIST_HEAD(in_multi_head, in_multi);
56
57 /*
58 * IPv4 per-interface state.
59 */
60 struct in_ifinfo {
61 struct lltable *ii_llt; /* ARP state */
62 struct igmp_ifsoftc *ii_igmp; /* IGMP state */
63 struct in_multi *ii_allhosts; /* 224.0.0.1 membership */
64 };
65
66 /*
67 * Interface address, Internet version. One of these structures
68 * is allocated for each Internet address on an interface.
69 * The ifaddr structure contains the protocol-independent part
70 * of the structure and is assumed to be first.
71 */
72 struct in_ifaddr {
73 struct ifaddr ia_ifa; /* protocol-independent info */
74 #define ia_ifp ia_ifa.ifa_ifp
75 #define ia_flags ia_ifa.ifa_flags
76 /* ia_subnet{,mask} in host order */
77 u_long ia_subnet; /* subnet address */
78 u_long ia_subnetmask; /* mask of subnet */
79 CK_LIST_ENTRY(in_ifaddr) ia_hash; /* hash of internet addresses */
80 CK_STAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
81 struct sockaddr_in ia_addr; /* reserve space for interface name */
82 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
83 #define ia_broadaddr ia_dstaddr
84 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
85 struct callout ia_garp_timer; /* timer for retransmitting GARPs */
86 int ia_garp_count; /* count of retransmitted GARPs */
87 };
88
89 /*
90 * Given a pointer to an in_ifaddr (ifaddr),
91 * return a pointer to the addr as a sockaddr_in.
92 */
93 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
94 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
95 #define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask))
96
97 #define IN_LNAOF(in, ifa) \
98 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
99
100 #ifdef _KERNEL
101 #define IN_ARE_MASKED_ADDR_EQUAL(d, a, m) ( \
102 ((((d).s_addr ^ (a).s_addr) & (m).s_addr)) == 0 )
103 #endif
104
105 #define LLTABLE(ifp) \
106 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
107 /*
108 * Hash table for IP addresses.
109 */
110 CK_STAILQ_HEAD(in_ifaddrhead, in_ifaddr);
111 CK_LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
112
113 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
114 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
115 VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */
116
117 #define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl)
118 #define V_in_ifaddrhead VNET(in_ifaddrhead)
119 #define V_in_ifaddrhmask VNET(in_ifaddrhmask)
120
121 #define INADDR_NHASH_LOG2 9
122 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2)
123 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
124 #define INADDR_HASH(x) \
125 (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
126
127 /*
128 * Macro for finding the internet address structure (in_ifaddr)
129 * corresponding to one of our IP addresses (in_addr).
130 */
131 #define INADDR_TO_IFADDR(addr, ia) \
132 /* struct in_addr addr; */ \
133 /* struct in_ifaddr *ia; */ \
134 do { \
135 NET_EPOCH_ASSERT(); \
136 CK_LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
137 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
138 break; \
139 } while (0)
140
141 /*
142 * Macro for finding the interface (ifnet structure) corresponding to one
143 * of our IP addresses.
144 */
145 #define INADDR_TO_IFP(addr, ifp) \
146 /* struct in_addr addr; */ \
147 /* struct ifnet *ifp; */ \
148 { \
149 struct in_ifaddr *ia; \
150 \
151 INADDR_TO_IFADDR(addr, ia); \
152 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
153 }
154
155 /*
156 * Macro for finding the internet address structure (in_ifaddr) corresponding
157 * to a given interface (ifnet structure).
158 */
159 #define IFP_TO_IA(ifp, ia) \
160 /* struct ifnet *ifp; */ \
161 /* struct in_ifaddr *ia; */ \
162 do { \
163 NET_EPOCH_ASSERT(); \
164 for ((ia) = CK_STAILQ_FIRST(&V_in_ifaddrhead); \
165 (ia) != NULL && (ia)->ia_ifp != (ifp); \
166 (ia) = CK_STAILQ_NEXT((ia), ia_link)) \
167 continue; \
168 } while (0)
169
170 /*
171 * Legacy IPv4 IGMP per-link structure.
172 */
173 struct router_info {
174 struct ifnet *rti_ifp;
175 int rti_type; /* type of router which is querier on this interface */
176 int rti_time; /* # of slow timeouts since last old query */
177 SLIST_ENTRY(router_info) rti_list;
178 };
179
180 /*
181 * IPv4 multicast IGMP-layer source entry.
182 */
183 struct ip_msource {
184 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
185 in_addr_t ims_haddr; /* host byte order */
186 struct ims_st {
187 uint16_t ex; /* # of exclusive members */
188 uint16_t in; /* # of inclusive members */
189 } ims_st[2]; /* state at t0, t1 */
190 uint8_t ims_stp; /* pending query */
191 };
192
193 /*
194 * IPv4 multicast PCB-layer source entry.
195 */
196 struct in_msource {
197 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
198 in_addr_t ims_haddr; /* host byte order */
199 uint8_t imsl_st[2]; /* state before/at commit */
200 };
201
202 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */
203
204 static __inline int
ip_msource_cmp(const struct ip_msource * a,const struct ip_msource * b)205 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
206 {
207
208 if (a->ims_haddr < b->ims_haddr)
209 return (-1);
210 if (a->ims_haddr == b->ims_haddr)
211 return (0);
212 return (1);
213 }
214 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
215
216 /*
217 * IPv4 multicast PCB-layer group filter descriptor.
218 */
219 struct in_mfilter {
220 struct ip_msource_tree imf_sources; /* source list for (S,G) */
221 u_long imf_nsrc; /* # of source entries */
222 uint8_t imf_st[2]; /* state before/at commit */
223 struct in_multi *imf_inm; /* associated multicast address */
224 STAILQ_ENTRY(in_mfilter) imf_entry; /* list entry */
225 };
226
227 /*
228 * Helper types and functions for IPv4 multicast filters.
229 */
230 STAILQ_HEAD(ip_mfilter_head, in_mfilter);
231
232 struct in_mfilter *ip_mfilter_alloc(int mflags, int st0, int st1);
233 void ip_mfilter_free(struct in_mfilter *);
234
235 static inline void
ip_mfilter_init(struct ip_mfilter_head * head)236 ip_mfilter_init(struct ip_mfilter_head *head)
237 {
238
239 STAILQ_INIT(head);
240 }
241
242 static inline struct in_mfilter *
ip_mfilter_first(const struct ip_mfilter_head * head)243 ip_mfilter_first(const struct ip_mfilter_head *head)
244 {
245
246 return (STAILQ_FIRST(head));
247 }
248
249 static inline void
ip_mfilter_insert(struct ip_mfilter_head * head,struct in_mfilter * imf)250 ip_mfilter_insert(struct ip_mfilter_head *head, struct in_mfilter *imf)
251 {
252
253 STAILQ_INSERT_TAIL(head, imf, imf_entry);
254 }
255
256 static inline void
ip_mfilter_remove(struct ip_mfilter_head * head,struct in_mfilter * imf)257 ip_mfilter_remove(struct ip_mfilter_head *head, struct in_mfilter *imf)
258 {
259
260 STAILQ_REMOVE(head, imf, in_mfilter, imf_entry);
261 }
262
263 #define IP_MFILTER_FOREACH(imf, head) \
264 STAILQ_FOREACH(imf, head, imf_entry)
265
266 static inline size_t
ip_mfilter_count(struct ip_mfilter_head * head)267 ip_mfilter_count(struct ip_mfilter_head *head)
268 {
269 struct in_mfilter *imf;
270 size_t num = 0;
271
272 STAILQ_FOREACH(imf, head, imf_entry)
273 num++;
274 return (num);
275 }
276
277 /*
278 * IPv4 group descriptor.
279 *
280 * For every entry on an ifnet's if_multiaddrs list which represents
281 * an IP multicast group, there is one of these structures.
282 *
283 * If any source filters are present, then a node will exist in the RB-tree
284 * to permit fast lookup by source whenever an operation takes place.
285 * This permits pre-order traversal when we issue reports.
286 * Source filter trees are kept separately from the socket layer to
287 * greatly simplify locking.
288 *
289 * When IGMPv3 is active, inm_timer is the response to group query timer.
290 * The state-change timer inm_sctimer is separate; whenever state changes
291 * for the group the state change record is generated and transmitted,
292 * and kept if retransmissions are necessary.
293 *
294 * FUTURE: inm_link is now only used when groups are being purged
295 * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
296 * because it is at the very start of the struct, we can't do this
297 * w/o breaking the ABI for ifmcstat.
298 */
299 struct in_multi {
300 LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */
301 struct in_addr inm_addr; /* IP multicast address, convenience */
302 struct ifnet *inm_ifp; /* back pointer to ifnet */
303 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
304 u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */
305 u_int inm_state; /* state of the membership */
306 void *inm_rti; /* unused, legacy field */
307 u_int inm_refcount; /* reference count */
308
309 /* New fields for IGMPv3 follow. */
310 struct igmp_ifsoftc *inm_igi; /* IGMP info */
311 SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */
312 struct ip_msource_tree inm_srcs; /* tree of sources */
313 u_long inm_nsrc; /* # of tree entries */
314
315 struct mbufq inm_scq; /* queue of pending
316 * state-change packets */
317 struct timeval inm_lastgsrtv; /* Time of last G-S-R query */
318 uint16_t inm_sctimer; /* state-change timer */
319 uint16_t inm_scrv; /* state-change rexmit count */
320
321 /*
322 * SSM state counters which track state at T0 (the time the last
323 * state-change report's RV timer went to zero) and T1
324 * (time of pending report, i.e. now).
325 * Used for computing IGMPv3 state-change reports. Several refcounts
326 * are maintained here to optimize for common use-cases.
327 */
328 struct inm_st {
329 uint16_t iss_fmode; /* IGMP filter mode */
330 uint16_t iss_asm; /* # of ASM listeners */
331 uint16_t iss_ex; /* # of exclusive members */
332 uint16_t iss_in; /* # of inclusive members */
333 uint16_t iss_rec; /* # of recorded sources */
334 } inm_st[2]; /* state at t0, t1 */
335 };
336
337 /*
338 * Helper function to derive the filter mode on a source entry
339 * from its internal counters. Predicates are:
340 * A source is only excluded if all listeners exclude it.
341 * A source is only included if no listeners exclude it,
342 * and at least one listener includes it.
343 * May be used by ifmcstat(8).
344 */
345 static __inline uint8_t
ims_get_mode(const struct in_multi * inm,const struct ip_msource * ims,uint8_t t)346 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
347 uint8_t t)
348 {
349
350 t = !!t;
351 if (inm->inm_st[t].iss_ex > 0 &&
352 inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
353 return (MCAST_EXCLUDE);
354 else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
355 return (MCAST_INCLUDE);
356 return (MCAST_UNDEFINED);
357 }
358
359 #ifdef SYSCTL_DECL
360 SYSCTL_DECL(_net_inet);
361 SYSCTL_DECL(_net_inet_ip);
362 SYSCTL_DECL(_net_inet_raw);
363 #endif
364
365 /*
366 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes
367 * before link layer multicast locks in the lock order. In most cases,
368 * consumers of IN_*_MULTI() macros should acquire the locks before
369 * calling them; users of the in_{add,del}multi() functions should not.
370 */
371 extern struct mtx in_multi_list_mtx;
372 extern struct sx in_multi_sx;
373
374 #define IN_MULTI_LIST_LOCK() mtx_lock(&in_multi_list_mtx)
375 #define IN_MULTI_LIST_UNLOCK() mtx_unlock(&in_multi_list_mtx)
376 #define IN_MULTI_LIST_LOCK_ASSERT() mtx_assert(&in_multi_list_mtx, MA_OWNED)
377 #define IN_MULTI_LIST_UNLOCK_ASSERT() mtx_assert(&in_multi_list_mtx, MA_NOTOWNED)
378
379 #define IN_MULTI_LOCK() sx_xlock(&in_multi_sx)
380 #define IN_MULTI_UNLOCK() sx_xunlock(&in_multi_sx)
381 #define IN_MULTI_LOCK_ASSERT() sx_assert(&in_multi_sx, SA_XLOCKED)
382 #define IN_MULTI_UNLOCK_ASSERT() sx_assert(&in_multi_sx, SA_XUNLOCKED)
383
384 void inm_disconnect(struct in_multi *inm);
385
386 /*
387 * Get the in_multi pointer from a ifmultiaddr.
388 * Returns NULL if ifmultiaddr is no longer valid.
389 */
390 static __inline struct in_multi *
inm_ifmultiaddr_get_inm(struct ifmultiaddr * ifma)391 inm_ifmultiaddr_get_inm(struct ifmultiaddr *ifma)
392 {
393
394 NET_EPOCH_ASSERT();
395
396 return ((ifma->ifma_addr->sa_family != AF_INET ||
397 (ifma->ifma_flags & IFMA_F_ENQUEUED) == 0) ? NULL :
398 ifma->ifma_protospec);
399 }
400
401 /* Acquire an in_multi record. */
402 static __inline void
inm_acquire_locked(struct in_multi * inm)403 inm_acquire_locked(struct in_multi *inm)
404 {
405
406 IN_MULTI_LIST_LOCK_ASSERT();
407 ++inm->inm_refcount;
408 }
409
410 static __inline void
inm_acquire(struct in_multi * inm)411 inm_acquire(struct in_multi *inm)
412 {
413 IN_MULTI_LIST_LOCK();
414 inm_acquire_locked(inm);
415 IN_MULTI_LIST_UNLOCK();
416 }
417
418 static __inline void
inm_rele_locked(struct in_multi_head * inmh,struct in_multi * inm)419 inm_rele_locked(struct in_multi_head *inmh, struct in_multi *inm)
420 {
421 MPASS(inm->inm_refcount > 0);
422 IN_MULTI_LIST_LOCK_ASSERT();
423
424 if (--inm->inm_refcount == 0) {
425 MPASS(inmh != NULL);
426 inm_disconnect(inm);
427 inm->inm_ifma->ifma_protospec = NULL;
428 SLIST_INSERT_HEAD(inmh, inm, inm_nrele);
429 }
430 }
431
432 /*
433 * Return values for imo_multi_filter().
434 */
435 #define MCAST_PASS 0 /* Pass */
436 #define MCAST_NOTGMEMBER 1 /* This host not a member of group */
437 #define MCAST_NOTSMEMBER 2 /* This host excluded source */
438 #define MCAST_MUTED 3 /* [deprecated] */
439
440 struct rib_head;
441 struct ip_moptions;
442 struct ucred;
443
444 struct in_multi *inm_lookup_locked(struct ifnet *, const struct in_addr);
445 struct in_multi *inm_lookup(struct ifnet *, const struct in_addr);
446 int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
447 const struct sockaddr *, const struct sockaddr *);
448 void inm_commit(struct in_multi *);
449 void inm_clear_recorded(struct in_multi *);
450 void inm_print(const struct in_multi *);
451 int inm_record_source(struct in_multi *inm, const in_addr_t);
452 void inm_release_deferred(struct in_multi *);
453 void inm_release_list_deferred(struct in_multi_head *);
454 void inm_release_wait(void *);
455 int in_joingroup(struct ifnet *, const struct in_addr *,
456 /*const*/ struct in_mfilter *, struct in_multi **);
457 int in_joingroup_locked(struct ifnet *, const struct in_addr *,
458 /*const*/ struct in_mfilter *, struct in_multi **);
459 int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
460 int in_leavegroup_locked(struct in_multi *,
461 /*const*/ struct in_mfilter *);
462 int in_control(struct socket *, u_long, void *, struct ifnet *,
463 struct thread *);
464 int in_control_ioctl(u_long, void *, struct ifnet *,
465 struct ucred *);
466 int in_addprefix(struct in_ifaddr *);
467 int in_scrubprefix(struct in_ifaddr *, u_int);
468 void in_ifscrub_all(void);
469 void ip_input(struct mbuf *);
470 void ip_direct_input(struct mbuf *);
471 void in_ifadown(struct ifaddr *ifa, int);
472 struct mbuf *ip_tryforward(struct mbuf *);
473 void *in_domifattach(struct ifnet *);
474 void in_domifdetach(struct ifnet *, void *);
475 struct rib_head *in_inithead(uint32_t fibnum);
476 #ifdef VIMAGE
477 void in_detachhead(struct rib_head *rh);
478 #endif
479
480 #endif /* _KERNEL */
481
482 /* INET6 stuff */
483 #include <netinet6/in6_var.h>
484
485 #endif /* _NETINET_IN_VAR_H_ */
486