1 /*- 2 * Copyright (c) 1985, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 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. 16 * 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 27 * SUCH DAMAGE. 28 * 29 * @(#)in_var.h 8.2 (Berkeley) 1/9/95 30 * $FreeBSD$ 31 */ 32 33 #ifndef _NETINET_IN_VAR_H_ 34 #define _NETINET_IN_VAR_H_ 35 36 #include <sys/queue.h> 37 #include <sys/fnv_hash.h> 38 #include <sys/tree.h> 39 40 struct igmp_ifinfo; 41 struct in_multi; 42 struct lltable; 43 44 /* 45 * IPv4 per-interface state. 46 */ 47 struct in_ifinfo { 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 */ 51 }; 52 53 /* 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. 58 */ 59 struct in_ifaddr { 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_subnet{,mask} in host order */ 64 u_long ia_subnet; /* subnet address */ 65 u_long ia_subnetmask; /* mask of subnet */ 66 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */ 67 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */ 68 struct sockaddr_in ia_addr; /* reserve space for interface name */ 69 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 70 #define ia_broadaddr ia_dstaddr 71 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 72 }; 73 74 struct in_aliasreq { 75 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 76 struct sockaddr_in ifra_addr; 77 struct sockaddr_in ifra_broadaddr; 78 #define ifra_dstaddr ifra_broadaddr 79 struct sockaddr_in ifra_mask; 80 int ifra_vhid; 81 }; 82 /* 83 * Given a pointer to an in_ifaddr (ifaddr), 84 * return a pointer to the addr as a sockaddr_in. 85 */ 86 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 87 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 88 #define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask)) 89 90 #define IN_LNAOF(in, ifa) \ 91 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 92 93 94 #ifdef _KERNEL 95 extern u_char inetctlerrmap[]; 96 97 #define LLTABLE(ifp) \ 98 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt 99 /* 100 * Hash table for IP addresses. 101 */ 102 TAILQ_HEAD(in_ifaddrhead, in_ifaddr); 103 LIST_HEAD(in_ifaddrhashhead, in_ifaddr); 104 105 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); 106 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead); 107 VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */ 108 109 #define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl) 110 #define V_in_ifaddrhead VNET(in_ifaddrhead) 111 #define V_in_ifaddrhmask VNET(in_ifaddrhmask) 112 113 #define INADDR_NHASH_LOG2 9 114 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2) 115 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT) 116 #define INADDR_HASH(x) \ 117 (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask]) 118 119 extern struct rwlock_padalign in_ifaddr_lock; 120 121 #define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED) 122 #define IN_IFADDR_RLOCK() rw_rlock(&in_ifaddr_lock) 123 #define IN_IFADDR_RLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_RLOCKED) 124 #define IN_IFADDR_RUNLOCK() rw_runlock(&in_ifaddr_lock) 125 #define IN_IFADDR_WLOCK() rw_wlock(&in_ifaddr_lock) 126 #define IN_IFADDR_WLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_WLOCKED) 127 #define IN_IFADDR_WUNLOCK() rw_wunlock(&in_ifaddr_lock) 128 129 /* 130 * Macro for finding the internet address structure (in_ifaddr) 131 * corresponding to one of our IP addresses (in_addr). 132 */ 133 #define INADDR_TO_IFADDR(addr, ia) \ 134 /* struct in_addr addr; */ \ 135 /* struct in_ifaddr *ia; */ \ 136 do { \ 137 \ 138 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \ 139 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \ 140 break; \ 141 } while (0) 142 143 /* 144 * Macro for finding the interface (ifnet structure) corresponding to one 145 * of our IP addresses. 146 */ 147 #define INADDR_TO_IFP(addr, ifp) \ 148 /* struct in_addr addr; */ \ 149 /* struct ifnet *ifp; */ \ 150 { \ 151 struct in_ifaddr *ia; \ 152 \ 153 INADDR_TO_IFADDR(addr, ia); \ 154 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 155 } 156 157 /* 158 * Macro for finding the internet address structure (in_ifaddr) corresponding 159 * to a given interface (ifnet structure). 160 */ 161 #define IFP_TO_IA(ifp, ia) \ 162 /* struct ifnet *ifp; */ \ 163 /* struct in_ifaddr *ia; */ \ 164 do { \ 165 IN_IFADDR_RLOCK(); \ 166 for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead); \ 167 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 168 (ia) = TAILQ_NEXT((ia), ia_link)) \ 169 continue; \ 170 if ((ia) != NULL) \ 171 ifa_ref(&(ia)->ia_ifa); \ 172 IN_IFADDR_RUNLOCK(); \ 173 } while (0) 174 #endif 175 176 /* 177 * IP datagram reassembly. 178 */ 179 #define IPREASS_NHASH_LOG2 6 180 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2) 181 #define IPREASS_HMASK (IPREASS_NHASH - 1) 182 #define IPREASS_HASH(x,y) \ 183 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK) 184 185 /* 186 * Legacy IPv4 IGMP per-link structure. 187 */ 188 struct router_info { 189 struct ifnet *rti_ifp; 190 int rti_type; /* type of router which is querier on this interface */ 191 int rti_time; /* # of slow timeouts since last old query */ 192 SLIST_ENTRY(router_info) rti_list; 193 }; 194 195 /* 196 * Per-interface IGMP router version information. 197 */ 198 struct igmp_ifinfo { 199 LIST_ENTRY(igmp_ifinfo) igi_link; 200 struct ifnet *igi_ifp; /* interface this instance belongs to */ 201 uint32_t igi_version; /* IGMPv3 Host Compatibility Mode */ 202 uint32_t igi_v1_timer; /* IGMPv1 Querier Present timer (s) */ 203 uint32_t igi_v2_timer; /* IGMPv2 Querier Present timer (s) */ 204 uint32_t igi_v3_timer; /* IGMPv3 General Query (interface) timer (s)*/ 205 uint32_t igi_flags; /* IGMP per-interface flags */ 206 uint32_t igi_rv; /* IGMPv3 Robustness Variable */ 207 uint32_t igi_qi; /* IGMPv3 Query Interval (s) */ 208 uint32_t igi_qri; /* IGMPv3 Query Response Interval (s) */ 209 uint32_t igi_uri; /* IGMPv3 Unsolicited Report Interval (s) */ 210 SLIST_HEAD(,in_multi) igi_relinmhead; /* released groups */ 211 struct ifqueue igi_gq; /* queue of general query responses */ 212 }; 213 214 #define IGIF_SILENT 0x00000001 /* Do not use IGMP on this ifp */ 215 #define IGIF_LOOPBACK 0x00000002 /* Send IGMP reports to loopback */ 216 217 /* 218 * IPv4 multicast IGMP-layer source entry. 219 */ 220 struct ip_msource { 221 RB_ENTRY(ip_msource) ims_link; /* RB tree links */ 222 in_addr_t ims_haddr; /* host byte order */ 223 struct ims_st { 224 uint16_t ex; /* # of exclusive members */ 225 uint16_t in; /* # of inclusive members */ 226 } ims_st[2]; /* state at t0, t1 */ 227 uint8_t ims_stp; /* pending query */ 228 }; 229 230 /* 231 * IPv4 multicast PCB-layer source entry. 232 */ 233 struct in_msource { 234 RB_ENTRY(ip_msource) ims_link; /* RB tree links */ 235 in_addr_t ims_haddr; /* host byte order */ 236 uint8_t imsl_st[2]; /* state before/at commit */ 237 }; 238 239 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */ 240 241 static __inline int 242 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b) 243 { 244 245 if (a->ims_haddr < b->ims_haddr) 246 return (-1); 247 if (a->ims_haddr == b->ims_haddr) 248 return (0); 249 return (1); 250 } 251 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp); 252 253 /* 254 * IPv4 multicast PCB-layer group filter descriptor. 255 */ 256 struct in_mfilter { 257 struct ip_msource_tree imf_sources; /* source list for (S,G) */ 258 u_long imf_nsrc; /* # of source entries */ 259 uint8_t imf_st[2]; /* state before/at commit */ 260 }; 261 262 /* 263 * IPv4 group descriptor. 264 * 265 * For every entry on an ifnet's if_multiaddrs list which represents 266 * an IP multicast group, there is one of these structures. 267 * 268 * If any source filters are present, then a node will exist in the RB-tree 269 * to permit fast lookup by source whenever an operation takes place. 270 * This permits pre-order traversal when we issue reports. 271 * Source filter trees are kept separately from the socket layer to 272 * greatly simplify locking. 273 * 274 * When IGMPv3 is active, inm_timer is the response to group query timer. 275 * The state-change timer inm_sctimer is separate; whenever state changes 276 * for the group the state change record is generated and transmitted, 277 * and kept if retransmissions are necessary. 278 * 279 * FUTURE: inm_link is now only used when groups are being purged 280 * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but 281 * because it is at the very start of the struct, we can't do this 282 * w/o breaking the ABI for ifmcstat. 283 */ 284 struct in_multi { 285 LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */ 286 struct in_addr inm_addr; /* IP multicast address, convenience */ 287 struct ifnet *inm_ifp; /* back pointer to ifnet */ 288 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 289 u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */ 290 u_int inm_state; /* state of the membership */ 291 void *inm_rti; /* unused, legacy field */ 292 u_int inm_refcount; /* reference count */ 293 294 /* New fields for IGMPv3 follow. */ 295 struct igmp_ifinfo *inm_igi; /* IGMP info */ 296 SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */ 297 struct ip_msource_tree inm_srcs; /* tree of sources */ 298 u_long inm_nsrc; /* # of tree entries */ 299 300 struct ifqueue inm_scq; /* queue of pending 301 * state-change packets */ 302 struct timeval inm_lastgsrtv; /* Time of last G-S-R query */ 303 uint16_t inm_sctimer; /* state-change timer */ 304 uint16_t inm_scrv; /* state-change rexmit count */ 305 306 /* 307 * SSM state counters which track state at T0 (the time the last 308 * state-change report's RV timer went to zero) and T1 309 * (time of pending report, i.e. now). 310 * Used for computing IGMPv3 state-change reports. Several refcounts 311 * are maintained here to optimize for common use-cases. 312 */ 313 struct inm_st { 314 uint16_t iss_fmode; /* IGMP filter mode */ 315 uint16_t iss_asm; /* # of ASM listeners */ 316 uint16_t iss_ex; /* # of exclusive members */ 317 uint16_t iss_in; /* # of inclusive members */ 318 uint16_t iss_rec; /* # of recorded sources */ 319 } inm_st[2]; /* state at t0, t1 */ 320 }; 321 322 /* 323 * Helper function to derive the filter mode on a source entry 324 * from its internal counters. Predicates are: 325 * A source is only excluded if all listeners exclude it. 326 * A source is only included if no listeners exclude it, 327 * and at least one listener includes it. 328 * May be used by ifmcstat(8). 329 */ 330 static __inline uint8_t 331 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims, 332 uint8_t t) 333 { 334 335 t = !!t; 336 if (inm->inm_st[t].iss_ex > 0 && 337 inm->inm_st[t].iss_ex == ims->ims_st[t].ex) 338 return (MCAST_EXCLUDE); 339 else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0) 340 return (MCAST_INCLUDE); 341 return (MCAST_UNDEFINED); 342 } 343 344 #ifdef _KERNEL 345 346 #ifdef SYSCTL_DECL 347 SYSCTL_DECL(_net_inet); 348 SYSCTL_DECL(_net_inet_ip); 349 SYSCTL_DECL(_net_inet_raw); 350 #endif 351 352 /* 353 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes 354 * before link layer multicast locks in the lock order. In most cases, 355 * consumers of IN_*_MULTI() macros should acquire the locks before 356 * calling them; users of the in_{add,del}multi() functions should not. 357 */ 358 extern struct mtx in_multi_mtx; 359 #define IN_MULTI_LOCK() mtx_lock(&in_multi_mtx) 360 #define IN_MULTI_UNLOCK() mtx_unlock(&in_multi_mtx) 361 #define IN_MULTI_LOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_OWNED) 362 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED) 363 364 /* 365 * Function for looking up an in_multi record for an IPv4 multicast address 366 * on a given interface. ifp must be valid. If no record found, return NULL. 367 * The IN_MULTI_LOCK and IF_ADDR_LOCK on ifp must be held. 368 */ 369 static __inline struct in_multi * 370 inm_lookup_locked(struct ifnet *ifp, const struct in_addr ina) 371 { 372 struct ifmultiaddr *ifma; 373 struct in_multi *inm; 374 375 IN_MULTI_LOCK_ASSERT(); 376 IF_ADDR_LOCK_ASSERT(ifp); 377 378 inm = NULL; 379 TAILQ_FOREACH(ifma, &((ifp)->if_multiaddrs), ifma_link) { 380 if (ifma->ifma_addr->sa_family == AF_INET) { 381 inm = (struct in_multi *)ifma->ifma_protospec; 382 if (inm->inm_addr.s_addr == ina.s_addr) 383 break; 384 inm = NULL; 385 } 386 } 387 return (inm); 388 } 389 390 /* 391 * Wrapper for inm_lookup_locked(). 392 * The IF_ADDR_LOCK will be taken on ifp and released on return. 393 */ 394 static __inline struct in_multi * 395 inm_lookup(struct ifnet *ifp, const struct in_addr ina) 396 { 397 struct in_multi *inm; 398 399 IN_MULTI_LOCK_ASSERT(); 400 IF_ADDR_RLOCK(ifp); 401 inm = inm_lookup_locked(ifp, ina); 402 IF_ADDR_RUNLOCK(ifp); 403 404 return (inm); 405 } 406 407 /* Acquire an in_multi record. */ 408 static __inline void 409 inm_acquire_locked(struct in_multi *inm) 410 { 411 412 IN_MULTI_LOCK_ASSERT(); 413 ++inm->inm_refcount; 414 } 415 416 /* 417 * Return values for imo_multi_filter(). 418 */ 419 #define MCAST_PASS 0 /* Pass */ 420 #define MCAST_NOTGMEMBER 1 /* This host not a member of group */ 421 #define MCAST_NOTSMEMBER 2 /* This host excluded source */ 422 #define MCAST_MUTED 3 /* [deprecated] */ 423 424 struct rtentry; 425 struct route; 426 struct ip_moptions; 427 struct radix_node_head; 428 429 int imo_multi_filter(const struct ip_moptions *, const struct ifnet *, 430 const struct sockaddr *, const struct sockaddr *); 431 void inm_commit(struct in_multi *); 432 void inm_clear_recorded(struct in_multi *); 433 void inm_print(const struct in_multi *); 434 int inm_record_source(struct in_multi *inm, const in_addr_t); 435 void inm_release(struct in_multi *); 436 void inm_release_locked(struct in_multi *); 437 struct in_multi * 438 in_addmulti(struct in_addr *, struct ifnet *); 439 void in_delmulti(struct in_multi *); 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 void in_rtqdrain(void); 450 int in_addprefix(struct in_ifaddr *, int); 451 int in_scrubprefix(struct in_ifaddr *, u_int); 452 void ip_input(struct mbuf *); 453 int in_ifadown(struct ifaddr *ifa, int); 454 void in_ifscrub(struct ifnet *, struct in_ifaddr *, u_int); 455 struct mbuf *ip_fastforward(struct mbuf *); 456 void *in_domifattach(struct ifnet *); 457 void in_domifdetach(struct ifnet *, void *); 458 459 460 /* XXX */ 461 void in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum); 462 void in_rtalloc(struct route *ro, u_int fibnum); 463 struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int); 464 void in_rtredirect(struct sockaddr *, struct sockaddr *, 465 struct sockaddr *, int, struct sockaddr *, u_int); 466 int in_rtrequest(int, struct sockaddr *, 467 struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int); 468 void in_setmatchfunc(struct radix_node_head *, int); 469 470 #if 0 471 int in_rt_getifa(struct rt_addrinfo *, u_int fibnum); 472 int in_rtioctl(u_long, caddr_t, u_int); 473 int in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int); 474 #endif 475 #endif /* _KERNEL */ 476 477 /* INET6 stuff */ 478 #include <netinet6/in6_var.h> 479 480 #endif /* _NETINET_IN_VAR_H_ */ 481