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31 * @(#)in_var.h 8.2 (Berkeley) 1/9/95
35 #ifndef _NETINET_IN_VAR_H_
36 #define _NETINET_IN_VAR_H_
39 * Argument structure for SIOCAIFADDR.
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;
51 #include <sys/queue.h>
52 #include <sys/fnv_hash.h>
58 SLIST_HEAD(in_multi_head, in_multi);
61 * IPv4 per-interface state.
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 */
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.
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 */
93 * Given a pointer to an in_ifaddr (ifaddr),
94 * return a pointer to the addr as a sockaddr_in.
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))
100 #define IN_LNAOF(in, ifa) \
101 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
103 extern u_char inetctlerrmap[];
105 #define LLTABLE(ifp) \
106 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt
108 * Hash table for IP addresses.
110 CK_STAILQ_HEAD(in_ifaddrhead, in_ifaddr);
111 CK_LIST_HEAD(in_ifaddrhashhead, in_ifaddr);
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 */
117 #define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl)
118 #define V_in_ifaddrhead VNET(in_ifaddrhead)
119 #define V_in_ifaddrhmask VNET(in_ifaddrhmask)
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])
128 * Macro for finding the internet address structure (in_ifaddr)
129 * corresponding to one of our IP addresses (in_addr).
131 #define INADDR_TO_IFADDR(addr, ia) \
132 /* struct in_addr addr; */ \
133 /* struct in_ifaddr *ia; */ \
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) \
142 * Macro for finding the interface (ifnet structure) corresponding to one
143 * of our IP addresses.
145 #define INADDR_TO_IFP(addr, ifp) \
146 /* struct in_addr addr; */ \
147 /* struct ifnet *ifp; */ \
149 struct in_ifaddr *ia; \
151 INADDR_TO_IFADDR(addr, ia); \
152 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \
156 * Macro for finding the internet address structure (in_ifaddr) corresponding
157 * to a given interface (ifnet structure).
159 #define IFP_TO_IA(ifp, ia) \
160 /* struct ifnet *ifp; */ \
161 /* struct in_ifaddr *ia; */ \
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)) \
171 * Legacy IPv4 IGMP per-link structure.
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;
181 * IPv4 multicast IGMP-layer source entry.
184 RB_ENTRY(ip_msource) ims_link; /* RB tree links */
185 in_addr_t ims_haddr; /* host byte order */
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 */
194 * IPv4 multicast PCB-layer source entry.
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 */
202 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */
205 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b)
208 if (a->ims_haddr < b->ims_haddr)
210 if (a->ims_haddr == b->ims_haddr)
214 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp);
217 * IPv4 multicast PCB-layer group filter descriptor.
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 */
228 * Helper types and functions for IPv4 multicast filters.
230 STAILQ_HEAD(ip_mfilter_head, in_mfilter);
232 struct in_mfilter *ip_mfilter_alloc(int mflags, int st0, int st1);
233 void ip_mfilter_free(struct in_mfilter *);
236 ip_mfilter_init(struct ip_mfilter_head *head)
242 static inline struct in_mfilter *
243 ip_mfilter_first(const struct ip_mfilter_head *head)
246 return (STAILQ_FIRST(head));
250 ip_mfilter_insert(struct ip_mfilter_head *head, struct in_mfilter *imf)
253 STAILQ_INSERT_TAIL(head, imf, imf_entry);
257 ip_mfilter_remove(struct ip_mfilter_head *head, struct in_mfilter *imf)
260 STAILQ_REMOVE(head, imf, in_mfilter, imf_entry);
263 #define IP_MFILTER_FOREACH(imf, head) \
264 STAILQ_FOREACH(imf, head, imf_entry)
267 ip_mfilter_count(struct ip_mfilter_head *head)
269 struct in_mfilter *imf;
272 STAILQ_FOREACH(imf, head, imf_entry)
278 * IPv4 group descriptor.
280 * For every entry on an ifnet's if_multiaddrs list which represents
281 * an IP multicast group, there is one of these structures.
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.
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.
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.
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 */
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 */
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 */
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.
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 */
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).
345 static __inline uint8_t
346 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims,
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);
360 SYSCTL_DECL(_net_inet);
361 SYSCTL_DECL(_net_inet_ip);
362 SYSCTL_DECL(_net_inet_raw);
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.
371 extern struct mtx in_multi_list_mtx;
372 extern struct sx in_multi_sx;
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)
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)
384 void inm_disconnect(struct in_multi *inm);
385 extern int ifma_restart;
387 /* Acquire an in_multi record. */
389 inm_acquire_locked(struct in_multi *inm)
392 IN_MULTI_LIST_LOCK_ASSERT();
397 inm_acquire(struct in_multi *inm)
399 IN_MULTI_LIST_LOCK();
400 inm_acquire_locked(inm);
401 IN_MULTI_LIST_UNLOCK();
405 inm_rele_locked(struct in_multi_head *inmh, struct in_multi *inm)
407 MPASS(inm->inm_refcount > 0);
408 IN_MULTI_LIST_LOCK_ASSERT();
410 if (--inm->inm_refcount == 0) {
413 inm->inm_ifma->ifma_protospec = NULL;
414 SLIST_INSERT_HEAD(inmh, inm, inm_nrele);
419 * Return values for imo_multi_filter().
421 #define MCAST_PASS 0 /* Pass */
422 #define MCAST_NOTGMEMBER 1 /* This host not a member of group */
423 #define MCAST_NOTSMEMBER 2 /* This host excluded source */
424 #define MCAST_MUTED 3 /* [deprecated] */
429 struct in_multi *inm_lookup_locked(struct ifnet *, const struct in_addr);
430 struct in_multi *inm_lookup(struct ifnet *, const struct in_addr);
431 int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
432 const struct sockaddr *, const struct sockaddr *);
433 void inm_commit(struct in_multi *);
434 void inm_clear_recorded(struct in_multi *);
435 void inm_print(const struct in_multi *);
436 int inm_record_source(struct in_multi *inm, const in_addr_t);
437 void inm_release_deferred(struct in_multi *);
438 void inm_release_list_deferred(struct in_multi_head *);
439 void inm_release_wait(void *);
440 int in_joingroup(struct ifnet *, const struct in_addr *,
441 /*const*/ struct in_mfilter *, struct in_multi **);
442 int in_joingroup_locked(struct ifnet *, const struct in_addr *,
443 /*const*/ struct in_mfilter *, struct in_multi **);
444 int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
445 int in_leavegroup_locked(struct in_multi *,
446 /*const*/ struct in_mfilter *);
447 int in_control(struct socket *, u_long, void *, struct ifnet *,
449 int in_addprefix(struct in_ifaddr *);
450 int in_scrubprefix(struct in_ifaddr *, u_int);
451 void in_ifscrub_all(void);
452 void ip_input(struct mbuf *);
453 void ip_direct_input(struct mbuf *);
454 void in_ifadown(struct ifaddr *ifa, int);
455 struct mbuf *ip_tryforward(struct mbuf *);
456 void *in_domifattach(struct ifnet *);
457 void in_domifdetach(struct ifnet *, void *);
458 struct rib_head *in_inithead(uint32_t fibnum);
460 void in_detachhead(struct rib_head *rh);
466 #include <netinet6/in6_var.h>
468 #endif /* _NETINET_IN_VAR_H_ */