2 * Copyright (c) 1985, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
29 * @(#)in_var.h 8.2 (Berkeley) 1/9/95
33 #ifndef _NETINET_IN_VAR_H_
34 #define _NETINET_IN_VAR_H_
36 #include <sys/queue.h>
37 #include <sys/fnv_hash.h>
45 * IPv4 per-interface state.
48 struct lltable *ii_llt; /* ARP state */
49 struct igmp_ifinfo *ii_igmp; /* IGMP state */
50 struct in_multi *ii_allhosts; /* 224.0.0.1 membership */
54 * Interface address, Internet version. One of these structures
55 * is allocated for each Internet address on an interface.
56 * The ifaddr structure contains the protocol-independent part
57 * of the structure and is assumed to be first.
60 struct ifaddr ia_ifa; /* protocol-independent info */
61 #define ia_ifp ia_ifa.ifa_ifp
62 #define ia_flags ia_ifa.ifa_flags
63 /* ia_{,sub}net{,mask} in host order */
64 u_long ia_net; /* network number of interface */
65 u_long ia_netmask; /* mask of net part */
66 u_long ia_subnet; /* subnet number, including net */
67 u_long ia_subnetmask; /* mask of subnet part */
68 struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
69 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */
70 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */
71 struct sockaddr_in ia_addr; /* reserve space for interface name */
72 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */
73 #define ia_broadaddr ia_dstaddr
74 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
78 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */
79 struct sockaddr_in ifra_addr;
80 struct sockaddr_in ifra_broadaddr;
81 #define ifra_dstaddr ifra_broadaddr
82 struct sockaddr_in ifra_mask;
85 * Given a pointer to an in_ifaddr (ifaddr),
86 * return a pointer to the addr as a sockaddr_in.
88 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr))
89 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
91 #define IN_LNAOF(in, ifa) \
92 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
96 extern u_char inetctlerrmap[];
98 #define LLTABLE(ifp) \
99 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
101 * Hash table for IP addresses.
103 TAILQ_HEAD(in_ifaddrhead, in_ifaddr);
104 LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
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 */
110 #define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl)
111 #define V_in_ifaddrhead VNET(in_ifaddrhead)
112 #define V_in_ifaddrhmask VNET(in_ifaddrhmask)
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])
120 extern struct rwlock in_ifaddr_lock;
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)
131 * Macro for finding the internet address structure (in_ifaddr)
132 * corresponding to one of our IP addresses (in_addr).
134 #define INADDR_TO_IFADDR(addr, ia) \
135 /* struct in_addr addr; */ \
136 /* struct in_ifaddr *ia; */ \
139 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \
140 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \
145 * Macro for finding the interface (ifnet structure) corresponding to one
146 * of our IP addresses.
148 #define INADDR_TO_IFP(addr, ifp) \
149 /* struct in_addr addr; */ \
150 /* struct ifnet *ifp; */ \
152 struct in_ifaddr *ia; \
154 INADDR_TO_IFADDR(addr, ia); \
155 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
159 * Macro for finding the internet address structure (in_ifaddr) corresponding
160 * to a given interface (ifnet structure).
162 #define IFP_TO_IA(ifp, ia) \
163 /* struct ifnet *ifp; */ \
164 /* struct in_ifaddr *ia; */ \
166 for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead); \
167 (ia) != NULL && (ia)->ia_ifp != (ifp); \
168 (ia) = TAILQ_NEXT((ia), ia_link)) \
171 ifa_ref(&(ia)->ia_ifa); \
176 * IP datagram reassembly.
178 #define IPREASS_NHASH_LOG2 6
179 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2)
180 #define IPREASS_HMASK (IPREASS_NHASH - 1)
181 #define IPREASS_HASH(x,y) \
182 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK)
185 * Legacy IPv4 IGMP per-link structure.
188 struct ifnet *rti_ifp;
189 int rti_type; /* type of router which is querier on this interface */
190 int rti_time; /* # of slow timeouts since last old query */
191 SLIST_ENTRY(router_info) rti_list;
195 * Per-interface IGMP router version information.
198 LIST_ENTRY(igmp_ifinfo) igi_link;
199 struct ifnet *igi_ifp; /* interface this instance belongs to */
200 uint32_t igi_version; /* IGMPv3 Host Compatibility Mode */
201 uint32_t igi_v1_timer; /* IGMPv1 Querier Present timer (s) */
202 uint32_t igi_v2_timer; /* IGMPv2 Querier Present timer (s) */
203 uint32_t igi_v3_timer; /* IGMPv3 General Query (interface) timer (s)*/
204 uint32_t igi_flags; /* IGMP per-interface flags */
205 uint32_t igi_rv; /* IGMPv3 Robustness Variable */
206 uint32_t igi_qi; /* IGMPv3 Query Interval (s) */
207 uint32_t igi_qri; /* IGMPv3 Query Response Interval (s) */
208 uint32_t igi_uri; /* IGMPv3 Unsolicited Report Interval (s) */
209 SLIST_HEAD(,in_multi) igi_relinmhead; /* released groups */
210 struct ifqueue igi_gq; /* queue of general query responses */
213 #define IGIF_SILENT 0x00000001 /* Do not use IGMP on this ifp */
214 #define IGIF_LOOPBACK 0x00000002 /* Send IGMP reports to loopback */
217 * IPv4 multicast IGMP-layer source entry.
220 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
221 in_addr_t ims_haddr; /* host byte order */
223 uint16_t ex; /* # of exclusive members */
224 uint16_t in; /* # of inclusive members */
225 } ims_st[2]; /* state at t0, t1 */
226 uint8_t ims_stp; /* pending query */
230 * IPv4 multicast PCB-layer source entry.
233 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
234 in_addr_t ims_haddr; /* host byte order */
235 uint8_t imsl_st[2]; /* state before/at commit */
238 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */
241 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
244 if (a->ims_haddr < b->ims_haddr)
246 if (a->ims_haddr == b->ims_haddr)
250 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
253 * IPv4 multicast PCB-layer group filter descriptor.
256 struct ip_msource_tree imf_sources; /* source list for (S,G) */
257 u_long imf_nsrc; /* # of source entries */
258 uint8_t imf_st[2]; /* state before/at commit */
262 * IPv4 group descriptor.
264 * For every entry on an ifnet's if_multiaddrs list which represents
265 * an IP multicast group, there is one of these structures.
267 * If any source filters are present, then a node will exist in the RB-tree
268 * to permit fast lookup by source whenever an operation takes place.
269 * This permits pre-order traversal when we issue reports.
270 * Source filter trees are kept separately from the socket layer to
271 * greatly simplify locking.
273 * When IGMPv3 is active, inm_timer is the response to group query timer.
274 * The state-change timer inm_sctimer is separate; whenever state changes
275 * for the group the state change record is generated and transmitted,
276 * and kept if retransmissions are necessary.
278 * FUTURE: inm_link is now only used when groups are being purged
279 * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
280 * because it is at the very start of the struct, we can't do this
281 * w/o breaking the ABI for ifmcstat.
284 LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */
285 struct in_addr inm_addr; /* IP multicast address, convenience */
286 struct ifnet *inm_ifp; /* back pointer to ifnet */
287 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */
288 u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */
289 u_int inm_state; /* state of the membership */
290 void *inm_rti; /* unused, legacy field */
291 u_int inm_refcount; /* reference count */
293 /* New fields for IGMPv3 follow. */
294 struct igmp_ifinfo *inm_igi; /* IGMP info */
295 SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */
296 struct ip_msource_tree inm_srcs; /* tree of sources */
297 u_long inm_nsrc; /* # of tree entries */
299 struct ifqueue inm_scq; /* queue of pending
300 * state-change packets */
301 struct timeval inm_lastgsrtv; /* Time of last G-S-R query */
302 uint16_t inm_sctimer; /* state-change timer */
303 uint16_t inm_scrv; /* state-change rexmit count */
306 * SSM state counters which track state at T0 (the time the last
307 * state-change report's RV timer went to zero) and T1
308 * (time of pending report, i.e. now).
309 * Used for computing IGMPv3 state-change reports. Several refcounts
310 * are maintained here to optimize for common use-cases.
313 uint16_t iss_fmode; /* IGMP filter mode */
314 uint16_t iss_asm; /* # of ASM listeners */
315 uint16_t iss_ex; /* # of exclusive members */
316 uint16_t iss_in; /* # of inclusive members */
317 uint16_t iss_rec; /* # of recorded sources */
318 } inm_st[2]; /* state at t0, t1 */
322 * Helper function to derive the filter mode on a source entry
323 * from its internal counters. Predicates are:
324 * A source is only excluded if all listeners exclude it.
325 * A source is only included if no listeners exclude it,
326 * and at least one listener includes it.
327 * May be used by ifmcstat(8).
329 static __inline uint8_t
330 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
335 if (inm->inm_st[t].iss_ex > 0 &&
336 inm->inm_st[t].iss_ex == ims->ims_st[t].ex)
337 return (MCAST_EXCLUDE);
338 else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0)
339 return (MCAST_INCLUDE);
340 return (MCAST_UNDEFINED);
346 SYSCTL_DECL(_net_inet);
347 SYSCTL_DECL(_net_inet_ip);
348 SYSCTL_DECL(_net_inet_raw);
352 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes
353 * before link layer multicast locks in the lock order. In most cases,
354 * consumers of IN_*_MULTI() macros should acquire the locks before
355 * calling them; users of the in_{add,del}multi() functions should not.
357 extern struct mtx in_multi_mtx;
358 #define IN_MULTI_LOCK() mtx_lock(&in_multi_mtx)
359 #define IN_MULTI_UNLOCK() mtx_unlock(&in_multi_mtx)
360 #define IN_MULTI_LOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_OWNED)
361 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED)
364 * Function for looking up an in_multi record for an IPv4 multicast address
365 * on a given interface. ifp must be valid. If no record found, return NULL.
366 * The IN_MULTI_LOCK and IF_ADDR_LOCK on ifp must be held.
368 static __inline struct in_multi *
369 inm_lookup_locked(struct ifnet *ifp, const struct in_addr ina)
371 struct ifmultiaddr *ifma;
372 struct in_multi *inm;
374 IN_MULTI_LOCK_ASSERT();
375 IF_ADDR_LOCK_ASSERT(ifp);
378 TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) {
379 if (ifma->ifma_addr->sa_family == AF_INET) {
380 inm = (struct in_multi *)ifma->ifma_protospec;
381 if (inm->inm_addr.s_addr == ina.s_addr)
390 * Wrapper for inm_lookup_locked().
391 * The IF_ADDR_LOCK will be taken on ifp and released on return.
393 static __inline struct in_multi *
394 inm_lookup(struct ifnet *ifp, const struct in_addr ina)
396 struct in_multi *inm;
398 IN_MULTI_LOCK_ASSERT();
400 inm = inm_lookup_locked(ifp, ina);
401 IF_ADDR_RUNLOCK(ifp);
406 /* Acquire an in_multi record. */
408 inm_acquire_locked(struct in_multi *inm)
411 IN_MULTI_LOCK_ASSERT();
416 * Return values for imo_multi_filter().
418 #define MCAST_PASS 0 /* Pass */
419 #define MCAST_NOTGMEMBER 1 /* This host not a member of group */
420 #define MCAST_NOTSMEMBER 2 /* This host excluded source */
421 #define MCAST_MUTED 3 /* [deprecated] */
426 struct radix_node_head;
428 int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
429 const struct sockaddr *, const struct sockaddr *);
430 void inm_commit(struct in_multi *);
431 void inm_clear_recorded(struct in_multi *);
432 void inm_print(const struct in_multi *);
433 int inm_record_source(struct in_multi *inm, const in_addr_t);
434 void inm_release(struct in_multi *);
435 void inm_release_locked(struct in_multi *);
437 in_addmulti(struct in_addr *, struct ifnet *);
438 void in_delmulti(struct in_multi *);
439 int in_joingroup(struct ifnet *, const struct in_addr *,
440 /*const*/ struct in_mfilter *, struct in_multi **);
441 int in_joingroup_locked(struct ifnet *, const struct in_addr *,
442 /*const*/ struct in_mfilter *, struct in_multi **);
443 int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
444 int in_leavegroup_locked(struct in_multi *,
445 /*const*/ struct in_mfilter *);
446 int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
448 void in_rtqdrain(void);
449 void ip_input(struct mbuf *);
450 int in_ifadown(struct ifaddr *ifa, int);
451 void in_ifscrub(struct ifnet *, struct in_ifaddr *, u_int);
452 struct mbuf *ip_fastforward(struct mbuf *);
453 void *in_domifattach(struct ifnet *);
454 void in_domifdetach(struct ifnet *, void *);
458 void in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum);
459 void in_rtalloc(struct route *ro, u_int fibnum);
460 struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int);
461 void in_rtredirect(struct sockaddr *, struct sockaddr *,
462 struct sockaddr *, int, struct sockaddr *, u_int);
463 int in_rtrequest(int, struct sockaddr *,
464 struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int);
465 void in_setmatchfunc(struct radix_node_head *, int);
468 int in_rt_getifa(struct rt_addrinfo *, u_int fibnum);
469 int in_rtioctl(u_long, caddr_t, u_int);
470 int in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int);
475 #include <netinet6/in6_var.h>
477 #endif /* _NETINET_IN_VAR_H_ */