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 #if defined(_KERNEL) || defined(_WANT_IFADDR) 54 /* 55 * Interface address, Internet version. One of these structures 56 * is allocated for each Internet address on an interface. 57 * The ifaddr structure contains the protocol-independent part 58 * of the structure and is assumed to be first. 59 */ 60 struct in_ifaddr { 61 struct ifaddr ia_ifa; /* protocol-independent info */ 62 #define ia_ifp ia_ifa.ifa_ifp 63 #define ia_flags ia_ifa.ifa_flags 64 /* ia_subnet{,mask} in host order */ 65 u_long ia_subnet; /* subnet address */ 66 u_long ia_subnetmask; /* mask of subnet */ 67 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */ 68 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */ 69 struct sockaddr_in ia_addr; /* reserve space for interface name */ 70 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 71 #define ia_broadaddr ia_dstaddr 72 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 73 }; 74 #endif 75 76 struct in_aliasreq { 77 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 78 struct sockaddr_in ifra_addr; 79 struct sockaddr_in ifra_broadaddr; 80 #define ifra_dstaddr ifra_broadaddr 81 struct sockaddr_in ifra_mask; 82 int ifra_vhid; 83 }; 84 /* 85 * Given a pointer to an in_ifaddr (ifaddr), 86 * return a pointer to the addr as a sockaddr_in. 87 */ 88 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 89 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 90 #define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask)) 91 92 #define IN_LNAOF(in, ifa) \ 93 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 94 95 96 #ifdef _KERNEL 97 extern u_char inetctlerrmap[]; 98 99 #define LLTABLE(ifp) \ 100 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt 101 /* 102 * Hash table for IP addresses. 103 */ 104 TAILQ_HEAD(in_ifaddrhead, in_ifaddr); 105 LIST_HEAD(in_ifaddrhashhead, in_ifaddr); 106 107 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); 108 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead); 109 VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */ 110 111 #define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl) 112 #define V_in_ifaddrhead VNET(in_ifaddrhead) 113 #define V_in_ifaddrhmask VNET(in_ifaddrhmask) 114 115 #define INADDR_NHASH_LOG2 9 116 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2) 117 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT) 118 #define INADDR_HASH(x) \ 119 (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask]) 120 121 extern struct rwlock in_ifaddr_lock; 122 123 #define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED) 124 #define IN_IFADDR_RLOCK() rw_rlock(&in_ifaddr_lock) 125 #define IN_IFADDR_RLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_RLOCKED) 126 #define IN_IFADDR_RUNLOCK() rw_runlock(&in_ifaddr_lock) 127 #define IN_IFADDR_WLOCK() rw_wlock(&in_ifaddr_lock) 128 #define IN_IFADDR_WLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_WLOCKED) 129 #define IN_IFADDR_WUNLOCK() rw_wunlock(&in_ifaddr_lock) 130 131 /* 132 * Macro for finding the internet address structure (in_ifaddr) 133 * corresponding to one of our IP addresses (in_addr). 134 */ 135 #define INADDR_TO_IFADDR(addr, ia) \ 136 /* struct in_addr addr; */ \ 137 /* struct in_ifaddr *ia; */ \ 138 do { \ 139 \ 140 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \ 141 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \ 142 break; \ 143 } while (0) 144 145 /* 146 * Macro for finding the interface (ifnet structure) corresponding to one 147 * of our IP addresses. 148 */ 149 #define INADDR_TO_IFP(addr, ifp) \ 150 /* struct in_addr addr; */ \ 151 /* struct ifnet *ifp; */ \ 152 { \ 153 struct in_ifaddr *ia; \ 154 \ 155 INADDR_TO_IFADDR(addr, ia); \ 156 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 157 } 158 159 /* 160 * Macro for finding the internet address structure (in_ifaddr) corresponding 161 * to a given interface (ifnet structure). 162 */ 163 #define IFP_TO_IA(ifp, ia) \ 164 /* struct ifnet *ifp; */ \ 165 /* struct in_ifaddr *ia; */ \ 166 do { \ 167 IN_IFADDR_RLOCK(); \ 168 for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead); \ 169 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 170 (ia) = TAILQ_NEXT((ia), ia_link)) \ 171 continue; \ 172 if ((ia) != NULL) \ 173 ifa_ref(&(ia)->ia_ifa); \ 174 IN_IFADDR_RUNLOCK(); \ 175 } while (0) 176 #endif 177 178 /* 179 * IP datagram reassembly. 180 */ 181 #define IPREASS_NHASH_LOG2 6 182 #define IPREASS_NHASH (1 << IPREASS_NHASH_LOG2) 183 #define IPREASS_HMASK (IPREASS_NHASH - 1) 184 #define IPREASS_HASH(x,y) \ 185 (((((x) & 0xF) | ((((x) >> 8) & 0xF) << 4)) ^ (y)) & IPREASS_HMASK) 186 187 /* 188 * Legacy IPv4 IGMP per-link structure. 189 */ 190 struct router_info { 191 struct ifnet *rti_ifp; 192 int rti_type; /* type of router which is querier on this interface */ 193 int rti_time; /* # of slow timeouts since last old query */ 194 SLIST_ENTRY(router_info) rti_list; 195 }; 196 197 /* 198 * Per-interface IGMP router version information. 199 */ 200 struct igmp_ifinfo { 201 LIST_ENTRY(igmp_ifinfo) igi_link; 202 struct ifnet *igi_ifp; /* interface this instance belongs to */ 203 uint32_t igi_version; /* IGMPv3 Host Compatibility Mode */ 204 uint32_t igi_v1_timer; /* IGMPv1 Querier Present timer (s) */ 205 uint32_t igi_v2_timer; /* IGMPv2 Querier Present timer (s) */ 206 uint32_t igi_v3_timer; /* IGMPv3 General Query (interface) timer (s)*/ 207 uint32_t igi_flags; /* IGMP per-interface flags */ 208 uint32_t igi_rv; /* IGMPv3 Robustness Variable */ 209 uint32_t igi_qi; /* IGMPv3 Query Interval (s) */ 210 uint32_t igi_qri; /* IGMPv3 Query Response Interval (s) */ 211 uint32_t igi_uri; /* IGMPv3 Unsolicited Report Interval (s) */ 212 SLIST_HEAD(,in_multi) igi_relinmhead; /* released groups */ 213 struct ifqueue igi_gq; /* queue of general query responses */ 214 }; 215 216 #define IGIF_SILENT 0x00000001 /* Do not use IGMP on this ifp */ 217 #define IGIF_LOOPBACK 0x00000002 /* Send IGMP reports to loopback */ 218 219 /* 220 * IPv4 multicast IGMP-layer source entry. 221 */ 222 struct ip_msource { 223 RB_ENTRY(ip_msource) ims_link; /* RB tree links */ 224 in_addr_t ims_haddr; /* host byte order */ 225 struct ims_st { 226 uint16_t ex; /* # of exclusive members */ 227 uint16_t in; /* # of inclusive members */ 228 } ims_st[2]; /* state at t0, t1 */ 229 uint8_t ims_stp; /* pending query */ 230 }; 231 232 /* 233 * IPv4 multicast PCB-layer source entry. 234 */ 235 struct in_msource { 236 RB_ENTRY(ip_msource) ims_link; /* RB tree links */ 237 in_addr_t ims_haddr; /* host byte order */ 238 uint8_t imsl_st[2]; /* state before/at commit */ 239 }; 240 241 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */ 242 243 static __inline int 244 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b) 245 { 246 247 if (a->ims_haddr < b->ims_haddr) 248 return (-1); 249 if (a->ims_haddr == b->ims_haddr) 250 return (0); 251 return (1); 252 } 253 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp); 254 255 /* 256 * IPv4 multicast PCB-layer group filter descriptor. 257 */ 258 struct in_mfilter { 259 struct ip_msource_tree imf_sources; /* source list for (S,G) */ 260 u_long imf_nsrc; /* # of source entries */ 261 uint8_t imf_st[2]; /* state before/at commit */ 262 }; 263 264 /* 265 * IPv4 group descriptor. 266 * 267 * For every entry on an ifnet's if_multiaddrs list which represents 268 * an IP multicast group, there is one of these structures. 269 * 270 * If any source filters are present, then a node will exist in the RB-tree 271 * to permit fast lookup by source whenever an operation takes place. 272 * This permits pre-order traversal when we issue reports. 273 * Source filter trees are kept separately from the socket layer to 274 * greatly simplify locking. 275 * 276 * When IGMPv3 is active, inm_timer is the response to group query timer. 277 * The state-change timer inm_sctimer is separate; whenever state changes 278 * for the group the state change record is generated and transmitted, 279 * and kept if retransmissions are necessary. 280 * 281 * FUTURE: inm_link is now only used when groups are being purged 282 * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but 283 * because it is at the very start of the struct, we can't do this 284 * w/o breaking the ABI for ifmcstat. 285 */ 286 struct in_multi { 287 LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */ 288 struct in_addr inm_addr; /* IP multicast address, convenience */ 289 struct ifnet *inm_ifp; /* back pointer to ifnet */ 290 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 291 u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */ 292 u_int inm_state; /* state of the membership */ 293 void *inm_rti; /* unused, legacy field */ 294 u_int inm_refcount; /* reference count */ 295 296 /* New fields for IGMPv3 follow. */ 297 struct igmp_ifinfo *inm_igi; /* IGMP info */ 298 SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */ 299 struct ip_msource_tree inm_srcs; /* tree of sources */ 300 u_long inm_nsrc; /* # of tree entries */ 301 302 struct ifqueue inm_scq; /* queue of pending 303 * state-change packets */ 304 struct timeval inm_lastgsrtv; /* Time of last G-S-R query */ 305 uint16_t inm_sctimer; /* state-change timer */ 306 uint16_t inm_scrv; /* state-change rexmit count */ 307 308 /* 309 * SSM state counters which track state at T0 (the time the last 310 * state-change report's RV timer went to zero) and T1 311 * (time of pending report, i.e. now). 312 * Used for computing IGMPv3 state-change reports. Several refcounts 313 * are maintained here to optimize for common use-cases. 314 */ 315 struct inm_st { 316 uint16_t iss_fmode; /* IGMP filter mode */ 317 uint16_t iss_asm; /* # of ASM listeners */ 318 uint16_t iss_ex; /* # of exclusive members */ 319 uint16_t iss_in; /* # of inclusive members */ 320 uint16_t iss_rec; /* # of recorded sources */ 321 } inm_st[2]; /* state at t0, t1 */ 322 }; 323 324 /* 325 * Helper function to derive the filter mode on a source entry 326 * from its internal counters. Predicates are: 327 * A source is only excluded if all listeners exclude it. 328 * A source is only included if no listeners exclude it, 329 * and at least one listener includes it. 330 * May be used by ifmcstat(8). 331 */ 332 static __inline uint8_t 333 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims, 334 uint8_t t) 335 { 336 337 t = !!t; 338 if (inm->inm_st[t].iss_ex > 0 && 339 inm->inm_st[t].iss_ex == ims->ims_st[t].ex) 340 return (MCAST_EXCLUDE); 341 else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0) 342 return (MCAST_INCLUDE); 343 return (MCAST_UNDEFINED); 344 } 345 346 #ifdef _KERNEL 347 348 #ifdef SYSCTL_DECL 349 SYSCTL_DECL(_net_inet); 350 SYSCTL_DECL(_net_inet_ip); 351 SYSCTL_DECL(_net_inet_raw); 352 #endif 353 354 /* 355 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes 356 * before link layer multicast locks in the lock order. In most cases, 357 * consumers of IN_*_MULTI() macros should acquire the locks before 358 * calling them; users of the in_{add,del}multi() functions should not. 359 */ 360 extern struct mtx in_multi_mtx; 361 #define IN_MULTI_LOCK() mtx_lock(&in_multi_mtx) 362 #define IN_MULTI_UNLOCK() mtx_unlock(&in_multi_mtx) 363 #define IN_MULTI_LOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_OWNED) 364 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED) 365 366 /* Acquire an in_multi record. */ 367 static __inline void 368 inm_acquire_locked(struct in_multi *inm) 369 { 370 371 IN_MULTI_LOCK_ASSERT(); 372 ++inm->inm_refcount; 373 } 374 375 /* 376 * Return values for imo_multi_filter(). 377 */ 378 #define MCAST_PASS 0 /* Pass */ 379 #define MCAST_NOTGMEMBER 1 /* This host not a member of group */ 380 #define MCAST_NOTSMEMBER 2 /* This host excluded source */ 381 #define MCAST_MUTED 3 /* [deprecated] */ 382 383 struct rtentry; 384 struct route; 385 struct ip_moptions; 386 struct radix_node_head; 387 388 struct in_multi *inm_lookup_locked(struct ifnet *, const struct in_addr); 389 struct in_multi *inm_lookup(struct ifnet *, const struct in_addr); 390 int imo_multi_filter(const struct ip_moptions *, const struct ifnet *, 391 const struct sockaddr *, const struct sockaddr *); 392 void inm_commit(struct in_multi *); 393 void inm_clear_recorded(struct in_multi *); 394 void inm_print(const struct in_multi *); 395 int inm_record_source(struct in_multi *inm, const in_addr_t); 396 void inm_release(struct in_multi *); 397 void inm_release_locked(struct in_multi *); 398 struct in_multi * 399 in_addmulti(struct in_addr *, struct ifnet *); 400 void in_delmulti(struct in_multi *); 401 int in_joingroup(struct ifnet *, const struct in_addr *, 402 /*const*/ struct in_mfilter *, struct in_multi **); 403 int in_joingroup_locked(struct ifnet *, const struct in_addr *, 404 /*const*/ struct in_mfilter *, struct in_multi **); 405 int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *); 406 int in_leavegroup_locked(struct in_multi *, 407 /*const*/ struct in_mfilter *); 408 int in_control(struct socket *, u_long, caddr_t, struct ifnet *, 409 struct thread *); 410 int in_addprefix(struct in_ifaddr *, int); 411 int in_scrubprefix(struct in_ifaddr *, u_int); 412 void ip_input(struct mbuf *); 413 void ip_direct_input(struct mbuf *); 414 void in_ifadown(struct ifaddr *ifa, int); 415 struct mbuf *ip_fastforward(struct mbuf *); 416 void *in_domifattach(struct ifnet *); 417 void in_domifdetach(struct ifnet *, void *); 418 419 420 /* XXX */ 421 void in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum); 422 void in_rtalloc(struct route *ro, u_int fibnum); 423 struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int); 424 void in_rtredirect(struct sockaddr *, struct sockaddr *, 425 struct sockaddr *, int, struct sockaddr *, u_int); 426 int in_rtrequest(int, struct sockaddr *, 427 struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int); 428 429 #if 0 430 int in_rt_getifa(struct rt_addrinfo *, u_int fibnum); 431 int in_rtioctl(u_long, caddr_t, u_int); 432 int in_rtrequest1(int, struct rt_addrinfo *, struct rtentry **, u_int); 433 #endif 434 #endif /* _KERNEL */ 435 436 /* INET6 stuff */ 437 #include <netinet6/in6_var.h> 438 439 #endif /* _NETINET_IN_VAR_H_ */ 440