1 /*-
2 * Copyright (c) 1985, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)in_var.h 8.2 (Berkeley) 1/9/95
30 * $FreeBSD$
31 */
32
33 #ifndef _NETINET_IN_VAR_H_
34 #define _NETINET_IN_VAR_H_
35
36 #include <sys/queue.h>
37 #include <sys/fnv_hash.h>
38 #include <sys/tree.h>
39 #include <sys/kern_event.h>
40
41 struct igmp_ifinfo;
42 struct in_multi;
43 struct lltable;
44
45 /*
46 * IPv4 per-interface state.
47 */
48 struct in_ifinfo {
49 struct lltable *ii_llt; /* ARP state */
50 struct igmp_ifinfo *ii_igmp; /* IGMP state */
51 struct in_multi *ii_allhosts; /* 224.0.0.1 membership */
52 };
53
54 /*
55 * Interface address, Internet version. One of these structures
56 * is allocated for each Internet address on an interface.
57 * The ifaddr structure contains the protocol-independent part
58 * of the structure and is assumed to be first.
59 */
60 struct in_ifaddr {
61 struct ifaddr ia_ifa; /* protocol-independent info */
62 #define ia_ifp ia_ifa.ifa_ifp
63 #define ia_flags ia_ifa.ifa_flags
64 /* ia_subnet{,mask} in host order */
65 u_long ia_subnet; /* subnet address */
66 u_long ia_subnetmask; /* mask of subnet */
67 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */
68 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
69 struct sockaddr_in ia_addr; /* reserve space for interface name */
70 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
71 #define ia_broadaddr ia_dstaddr
72 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
73 };
74
75 struct in_aliasreq {
76 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
77 struct sockaddr_in ifra_addr;
78 struct sockaddr_in ifra_broadaddr;
79 #define ifra_dstaddr ifra_broadaddr
80 struct sockaddr_in ifra_mask;
81 int ifra_vhid;
82 };
83 /*
84 * Given a pointer to an in_ifaddr (ifaddr),
85 * return a pointer to the addr as a sockaddr_in.
86 */
87 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
88 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
89 #define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask))
90
91 #define IN_LNAOF(in, ifa) \
92 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
93
94
95 #ifdef _KERNEL
96 extern u_char inetctlerrmap[];
97
98 #define LLTABLE(ifp) \
99 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
100 /*
101 * Hash table for IP addresses.
102 */
103 TAILQ_HEAD(in_ifaddrhead, in_ifaddr);
104 LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
105
106 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl);
107 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead);
108 VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */
109
110 #define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl)
111 #define V_in_ifaddrhead VNET(in_ifaddrhead)
112 #define V_in_ifaddrhmask VNET(in_ifaddrhmask)
113
114 #define INADDR_NHASH_LOG2 9
115 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2)
116 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT)
117 #define INADDR_HASH(x) \
118 (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask])
119
120 extern struct rwlock in_ifaddr_lock;
121
122 #define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED)
123 #define IN_IFADDR_RLOCK() rw_rlock(&in_ifaddr_lock)
124 #define IN_IFADDR_RLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_RLOCKED)
125 #define IN_IFADDR_RUNLOCK() rw_runlock(&in_ifaddr_lock)
126 #define IN_IFADDR_WLOCK() rw_wlock(&in_ifaddr_lock)
127 #define IN_IFADDR_WLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_WLOCKED)
128 #define IN_IFADDR_WUNLOCK() rw_wunlock(&in_ifaddr_lock)
129
130 /*
131 * Macro for finding the internet address structure (in_ifaddr)
132 * corresponding to one of our IP addresses (in_addr).
133 */
134 #define INADDR_TO_IFADDR(addr, ia) \
135 /* struct in_addr addr; */ \
136 /* struct in_ifaddr *ia; */ \
137 do { \
138 \
139 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
140 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
141 break; \
142 } while (0)
143
144 /*
145 * Macro for finding the interface (ifnet structure) corresponding to one
146 * of our IP addresses.
147 */
148 #define INADDR_TO_IFP(addr, ifp) \
149 /* struct in_addr addr; */ \
150 /* struct ifnet *ifp; */ \
151 { \
152 struct in_ifaddr *ia; \
153 \
154 INADDR_TO_IFADDR(addr, ia); \
155 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
156 }
157
158 /*
159 * Macro for finding the internet address structure (in_ifaddr) corresponding
160 * to a given interface (ifnet structure).
161 */
162 #define IFP_TO_IA(ifp, ia) \
163 /* struct ifnet *ifp; */ \
164 /* struct in_ifaddr *ia; */ \
165 do { \
166 IN_IFADDR_RLOCK(); \
167 for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead); \
168 (ia) != NULL && (ia)->ia_ifp != (ifp); \
169 (ia) = TAILQ_NEXT((ia), ia_link)) \
170 continue; \
171 if ((ia) != NULL) \
172 ifa_ref(&(ia)->ia_ifa); \
173 IN_IFADDR_RUNLOCK(); \
174 } while (0)
175 #endif
176
177 /*
178 * IP datagram reassembly.
179 */
180 #define IPREASS_NHASH_LOG2 6
181 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
182 #define IPREASS_HMASK (IPREASS_NHASH - 1)
183 #define IPREASS_HASH(x,y) \
184 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
185
186 /*
187 * Legacy IPv4 IGMP per-link structure.
188 */
189 struct router_info {
190 struct ifnet *rti_ifp;
191 int rti_type; /* type of router which is querier on this interface */
192 int rti_time; /* # of slow timeouts since last old query */
193 SLIST_ENTRY(router_info) rti_list;
194 };
195
196 /*
197 * Per-interface IGMP router version information.
198 */
199 struct igmp_ifinfo {
200 LIST_ENTRY(igmp_ifinfo) igi_link;
201 struct ifnet *igi_ifp; /* interface this instance belongs to */
202 uint32_t igi_version; /* IGMPv3 Host Compatibility Mode */
203 uint32_t igi_v1_timer; /* IGMPv1 Querier Present timer (s) */
204 uint32_t igi_v2_timer; /* IGMPv2 Querier Present timer (s) */
205 uint32_t igi_v3_timer; /* IGMPv3 General Query (interface) timer (s)*/
206 uint32_t igi_flags; /* IGMP per-interface flags */
207 uint32_t igi_rv; /* IGMPv3 Robustness Variable */
208 uint32_t igi_qi; /* IGMPv3 Query Interval (s) */
209 uint32_t igi_qri; /* IGMPv3 Query Response Interval (s) */
210 uint32_t igi_uri; /* IGMPv3 Unsolicited Report Interval (s) */
211 SLIST_HEAD(,in_multi) igi_relinmhead; /* released groups */
212 struct ifqueue igi_gq; /* queue of general query responses */
213 };
214
215 #define IGIF_SILENT 0x00000001 /* Do not use IGMP on this ifp */
216 #define IGIF_LOOPBACK 0x00000002 /* Send IGMP reports to loopback */
217
218 /*
219 * IPv4 multicast IGMP-layer source entry.
220 */
221 struct ip_msource {
222 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
223 in_addr_t ims_haddr; /* host byte order */
224 struct ims_st {
225 uint16_t ex; /* # of exclusive members */
226 uint16_t in; /* # of inclusive members */
227 } ims_st[2]; /* state at t0, t1 */
228 uint8_t ims_stp; /* pending query */
229 };
230
231 /*
232 * IPv4 multicast PCB-layer source entry.
233 */
234 struct in_msource {
235 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
236 in_addr_t ims_haddr; /* host byte order */
237 uint8_t imsl_st[2]; /* state before/at commit */
238 };
239
240 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */
241
242 static __inline int
ip_msource_cmp(const struct ip_msource * a,const struct ip_msource * b)243 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
244 {
245
246 if (a->ims_haddr < b->ims_haddr)
247 return (-1);
248 if (a->ims_haddr == b->ims_haddr)
249 return (0);
250 return (1);
251 }
252 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
253
254 /*
255 * IPv4 multicast PCB-layer group filter descriptor.
256 */
257 struct in_mfilter {
258 struct ip_msource_tree imf_sources; /* source list for (S,G) */
259 u_long imf_nsrc; /* # of source entries */
260 uint8_t imf_st[2]; /* state before/at commit */
261 };
262
263 /*
264 * IPv4 group descriptor.
265 *
266 * For every entry on an ifnet's if_multiaddrs list which represents
267 * an IP multicast group, there is one of these structures.
268 *
269 * If any source filters are present, then a node will exist in the RB-tree
270 * to permit fast lookup by source whenever an operation takes place.
271 * This permits pre-order traversal when we issue reports.
272 * Source filter trees are kept separately from the socket layer to
273 * greatly simplify locking.
274 *
275 * When IGMPv3 is active, inm_timer is the response to group query timer.
276 * The state-change timer inm_sctimer is separate; whenever state changes
277 * for the group the state change record is generated and transmitted,
278 * and kept if retransmissions are necessary.
279 *
280 * FUTURE: inm_link is now only used when groups are being purged
281 * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
282 * because it is at the very start of the struct, we can't do this
283 * w/o breaking the ABI for ifmcstat.
284 */
285 struct in_multi {
286 LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */
287 struct in_addr inm_addr; /* IP multicast address, convenience */
288 struct ifnet *inm_ifp; /* back pointer to ifnet */
289 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
290 u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */
291 u_int inm_state; /* state of the membership */
292 void *inm_rti; /* unused, legacy field */
293 u_int inm_refcount; /* reference count */
294
295 /* New fields for IGMPv3 follow. */
296 struct igmp_ifinfo *inm_igi; /* IGMP info */
297 SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */
298 struct ip_msource_tree inm_srcs; /* tree of sources */
299 u_long inm_nsrc; /* # of tree entries */
300
301 struct ifqueue inm_scq; /* queue of pending
302 * state-change packets */
303 struct timeval inm_lastgsrtv; /* Time of last G-S-R query */
304 uint16_t inm_sctimer; /* state-change timer */
305 uint16_t inm_scrv; /* state-change rexmit count */
306
307 /*
308 * SSM state counters which track state at T0 (the time the last
309 * state-change report's RV timer went to zero) and T1
310 * (time of pending report, i.e. now).
311 * Used for computing IGMPv3 state-change reports. Several refcounts
312 * are maintained here to optimize for common use-cases.
313 */
314 struct inm_st {
315 uint16_t iss_fmode; /* IGMP filter mode */
316 uint16_t iss_asm; /* # of ASM listeners */
317 uint16_t iss_ex; /* # of exclusive members */
318 uint16_t iss_in; /* # of inclusive members */
319 uint16_t iss_rec; /* # of recorded sources */
320 } inm_st[2]; /* state at t0, t1 */
321 };
322
323 /*
324 * Helper function to derive the filter mode on a source entry
325 * from its internal counters. Predicates are:
326 * A source is only excluded if all listeners exclude it.
327 * A source is only included if no listeners exclude it,
328 * and at least one listener includes it.
329 * May be used by ifmcstat(8).
330 */
331 static __inline uint8_t
ims_get_mode(const struct in_multi * inm,const struct ip_msource * ims,uint8_t t)332 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
333 uint8_t t)
334 {
335
336 t = !!t;
337 if (inm->inm_st[t].iss_ex > 0 &&
338 inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
339 return (MCAST_EXCLUDE);
340 else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
341 return (MCAST_INCLUDE);
342 return (MCAST_UNDEFINED);
343 }
344
345 #ifdef _KERNEL
346
347 #ifdef SYSCTL_DECL
348 SYSCTL_DECL(_net_inet);
349 SYSCTL_DECL(_net_inet_ip);
350 SYSCTL_DECL(_net_inet_raw);
351 #endif
352
353 /*
354 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes
355 * before link layer multicast locks in the lock order. In most cases,
356 * consumers of IN_*_MULTI() macros should acquire the locks before
357 * calling them; users of the in_{add,del}multi() functions should not.
358 */
359 extern struct mtx in_multi_mtx;
360 #define IN_MULTI_LOCK() mtx_lock(&in_multi_mtx)
361 #define IN_MULTI_UNLOCK() mtx_unlock(&in_multi_mtx)
362 #define IN_MULTI_LOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_OWNED)
363 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED)
364
365 /*
366 * Function for looking up an in_multi record for an IPv4 multicast address
367 * on a given interface. ifp must be valid. If no record found, return NULL.
368 * The IN_MULTI_LOCK and IF_ADDR_LOCK on ifp must be held.
369 */
370 static __inline struct in_multi *
inm_lookup_locked(struct ifnet * ifp,const struct in_addr ina)371 inm_lookup_locked(struct ifnet *ifp, const struct in_addr ina)
372 {
373 struct ifmultiaddr *ifma;
374 struct in_multi *inm;
375
376 IN_MULTI_LOCK_ASSERT();
377 IF_ADDR_LOCK_ASSERT(ifp);
378
379 inm = NULL;
380 TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) {
381 if (ifma->ifma_addr->sa_family == AF_INET) {
382 inm = (struct in_multi *)ifma->ifma_protospec;
383 if (inm->inm_addr.s_addr == ina.s_addr)
384 break;
385 inm = NULL;
386 }
387 }
388 return (inm);
389 }
390
391 /*
392 * Wrapper for inm_lookup_locked().
393 * The IF_ADDR_LOCK will be taken on ifp and released on return.
394 */
395 static __inline struct in_multi *
inm_lookup(struct ifnet * ifp,const struct in_addr ina)396 inm_lookup(struct ifnet *ifp, const struct in_addr ina)
397 {
398 struct in_multi *inm;
399
400 IN_MULTI_LOCK_ASSERT();
401 IF_ADDR_RLOCK(ifp);
402 inm = inm_lookup_locked(ifp, ina);
403 IF_ADDR_RUNLOCK(ifp);
404
405 return (inm);
406 }
407
408 /* Acquire an in_multi record. */
409 static __inline void
inm_acquire_locked(struct in_multi * inm)410 inm_acquire_locked(struct in_multi *inm)
411 {
412
413 IN_MULTI_LOCK_ASSERT();
414 ++inm->inm_refcount;
415 }
416
417 /*
418 * Return values for imo_multi_filter().
419 */
420 #define MCAST_PASS 0 /* Pass */
421 #define MCAST_NOTGMEMBER 1 /* This host not a member of group */
422 #define MCAST_NOTSMEMBER 2 /* This host excluded source */
423 #define MCAST_MUTED 3 /* [deprecated] */
424
425 struct rtentry;
426 struct route;
427 struct ip_moptions;
428 struct radix_node_head;
429
430 int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
431 const struct sockaddr *, const struct sockaddr *);
432 void inm_commit(struct in_multi *);
433 void inm_clear_recorded(struct in_multi *);
434 void inm_print(const struct in_multi *);
435 int inm_record_source(struct in_multi *inm, const in_addr_t);
436 void inm_release(struct in_multi *);
437 void inm_release_locked(struct in_multi *);
438 struct in_multi *
439 in_addmulti(struct in_addr *, struct ifnet *);
440 void in_delmulti(struct in_multi *);
441 int in_joingroup(struct ifnet *, const struct in_addr *,
442 /*const*/ struct in_mfilter *, struct in_multi **);
443 int in_joingroup_locked(struct ifnet *, const struct in_addr *,
444 /*const*/ struct in_mfilter *, struct in_multi **);
445 int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
446 int in_leavegroup_locked(struct in_multi *,
447 /*const*/ struct in_mfilter *);
448 int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
449 struct thread *);
450 void in_rtqdrain(void);
451 int in_addprefix(struct in_ifaddr *, int);
452 int in_scrubprefix(struct in_ifaddr *, u_int);
453 void ip_input(struct mbuf *);
454 int in_ifadown(struct ifaddr *ifa, int);
455 void in_ifscrub(struct ifnet *, struct in_ifaddr *, u_int);
456 struct mbuf *ip_fastforward(struct mbuf *);
457 void *in_domifattach(struct ifnet *);
458 void in_domifdetach(struct ifnet *, void *);
459
460
461 /* XXX */
462 void in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum);
463 void in_rtalloc(struct route *ro, u_int fibnum);
464 struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int);
465 void in_rtredirect(struct sockaddr *, struct sockaddr *,
466 struct sockaddr *, int, struct sockaddr *, u_int);
467 int in_rtrequest(int, struct sockaddr *,
468 struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
469 void in_setmatchfunc(struct radix_node_head *, int);
470
471 #if 0
472 int in_rt_getifa(struct rt_addrinfo *, u_int fibnum);
473 int in_rtioctl(u_long, caddr_t, u_int);
474 int in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int);
475 #endif
476 #endif /* _KERNEL */
477
478 /* INET6 stuff */
479 #include <netinet6/in6_var.h>
480
481 #endif /* _NETINET_IN_VAR_H_ */
482