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