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 extern 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 */ 110 CK_STAILQ_HEAD(in_ifaddrhead, in_ifaddr); 111 CK_LIST_HEAD(in_ifaddrhashhead, in_ifaddr); 112 113 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 */ 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]) 126 127 /* 128 * Macro for finding the internet address structure (in_ifaddr) 129 * corresponding to one of our IP addresses (in_addr). 130 */ 131 #define INADDR_TO_IFADDR(addr, ia) \ 132 /* struct in_addr addr; */ \ 133 /* struct in_ifaddr *ia; */ \ 134 do { \ 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) \ 138 break; \ 139 } while (0) 140 141 /* 142 * Macro for finding the interface (ifnet structure) corresponding to one 143 * of our IP addresses. 144 */ 145 #define INADDR_TO_IFP(addr, ifp) \ 146 /* struct in_addr addr; */ \ 147 /* struct ifnet *ifp; */ \ 148 { \ 149 struct in_ifaddr *ia; \ 150 \ 151 INADDR_TO_IFADDR(addr, ia); \ 152 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 153 } 154 155 /* 156 * Macro for finding the internet address structure (in_ifaddr) corresponding 157 * to a given interface (ifnet structure). 158 */ 159 #define IFP_TO_IA(ifp, ia) \ 160 /* struct ifnet *ifp; */ \ 161 /* struct in_ifaddr *ia; */ \ 162 do { \ 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)) \ 167 continue; \ 168 } while (0) 169 170 /* 171 * Legacy IPv4 IGMP per-link structure. 172 */ 173 struct router_info { 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; 178 }; 179 180 /* 181 * IPv4 multicast IGMP-layer source entry. 182 */ 183 struct ip_msource { 184 RB_ENTRY(ip_msource) ims_link; /* RB tree links */ 185 in_addr_t ims_haddr; /* host byte order */ 186 struct ims_st { 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 */ 191 }; 192 193 /* 194 * IPv4 multicast PCB-layer source entry. 195 */ 196 struct in_msource { 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 */ 200 }; 201 202 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */ 203 204 static __inline int 205 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b) 206 { 207 208 if (a->ims_haddr < b->ims_haddr) 209 return (-1); 210 if (a->ims_haddr == b->ims_haddr) 211 return (0); 212 return (1); 213 } 214 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp); 215 216 /* 217 * IPv4 multicast PCB-layer group filter descriptor. 218 */ 219 struct in_mfilter { 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 */ 225 }; 226 227 /* 228 * Helper types and functions for IPv4 multicast filters. 229 */ 230 STAILQ_HEAD(ip_mfilter_head, in_mfilter); 231 232 struct in_mfilter *ip_mfilter_alloc(int mflags, int st0, int st1); 233 void ip_mfilter_free(struct in_mfilter *); 234 235 static inline void 236 ip_mfilter_init(struct ip_mfilter_head *head) 237 { 238 239 STAILQ_INIT(head); 240 } 241 242 static inline struct in_mfilter * 243 ip_mfilter_first(const struct ip_mfilter_head *head) 244 { 245 246 return (STAILQ_FIRST(head)); 247 } 248 249 static inline void 250 ip_mfilter_insert(struct ip_mfilter_head *head, struct in_mfilter *imf) 251 { 252 253 STAILQ_INSERT_TAIL(head, imf, imf_entry); 254 } 255 256 static inline void 257 ip_mfilter_remove(struct ip_mfilter_head *head, struct in_mfilter *imf) 258 { 259 260 STAILQ_REMOVE(head, imf, in_mfilter, imf_entry); 261 } 262 263 #define IP_MFILTER_FOREACH(imf, head) \ 264 STAILQ_FOREACH(imf, head, imf_entry) 265 266 static inline size_t 267 ip_mfilter_count(struct ip_mfilter_head *head) 268 { 269 struct in_mfilter *imf; 270 size_t num = 0; 271 272 STAILQ_FOREACH(imf, head, imf_entry) 273 num++; 274 return (num); 275 } 276 277 /* 278 * IPv4 group descriptor. 279 * 280 * For every entry on an ifnet's if_multiaddrs list which represents 281 * an IP multicast group, there is one of these structures. 282 * 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. 288 * 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. 293 * 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. 298 */ 299 struct in_multi { 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 */ 308 309 /* 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 */ 314 315 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 */ 320 321 /* 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. 327 */ 328 struct inm_st { 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 */ 335 }; 336 337 /* 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). 344 */ 345 static __inline uint8_t 346 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims, 347 uint8_t t) 348 { 349 350 t = !!t; 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); 357 } 358 359 #ifdef SYSCTL_DECL 360 SYSCTL_DECL(_net_inet); 361 SYSCTL_DECL(_net_inet_ip); 362 SYSCTL_DECL(_net_inet_raw); 363 #endif 364 365 /* 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. 370 */ 371 extern struct mtx in_multi_list_mtx; 372 extern struct sx in_multi_sx; 373 374 #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) 378 379 #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) 383 384 void inm_disconnect(struct in_multi *inm); 385 extern int ifma_restart; 386 387 /* Acquire an in_multi record. */ 388 static __inline void 389 inm_acquire_locked(struct in_multi *inm) 390 { 391 392 IN_MULTI_LIST_LOCK_ASSERT(); 393 ++inm->inm_refcount; 394 } 395 396 static __inline void 397 inm_acquire(struct in_multi *inm) 398 { 399 IN_MULTI_LIST_LOCK(); 400 inm_acquire_locked(inm); 401 IN_MULTI_LIST_UNLOCK(); 402 } 403 404 static __inline void 405 inm_rele_locked(struct in_multi_head *inmh, struct in_multi *inm) 406 { 407 MPASS(inm->inm_refcount > 0); 408 IN_MULTI_LIST_LOCK_ASSERT(); 409 410 if (--inm->inm_refcount == 0) { 411 MPASS(inmh != NULL); 412 inm_disconnect(inm); 413 inm->inm_ifma->ifma_protospec = NULL; 414 SLIST_INSERT_HEAD(inmh, inm, inm_nrele); 415 } 416 } 417 418 /* 419 * Return values for imo_multi_filter(). 420 */ 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] */ 425 426 struct rib_head; 427 struct ip_moptions; 428 429 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, caddr_t, struct ifnet *, 448 struct thread *); 449 int in_addprefix(struct in_ifaddr *); 450 int in_scrubprefix(struct in_ifaddr *, u_int); 451 void in_ifscrub_all(void); 452 int in_handle_ifaddr_route(int, struct in_ifaddr *); 453 void ip_input(struct mbuf *); 454 void ip_direct_input(struct mbuf *); 455 void in_ifadown(struct ifaddr *ifa, int); 456 struct mbuf *ip_tryforward(struct mbuf *); 457 void *in_domifattach(struct ifnet *); 458 void in_domifdetach(struct ifnet *, void *); 459 struct rib_head *in_inithead(uint32_t fibnum); 460 #ifdef VIMAGE 461 void in_detachhead(struct rib_head *rh); 462 #endif 463 464 #endif /* _KERNEL */ 465 466 /* INET6 stuff */ 467 #include <netinet6/in6_var.h> 468 469 #endif /* _NETINET_IN_VAR_H_ */ 470