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