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 /* 37 * Argument structure for SIOCAIFADDR. 38 */ 39 struct in_aliasreq { 40 char ifra_name[IFNAMSIZ]; /* if name, e.g. "en0" */ 41 struct sockaddr_in ifra_addr; 42 struct sockaddr_in ifra_broadaddr; 43 #define ifra_dstaddr ifra_broadaddr 44 struct sockaddr_in ifra_mask; 45 int ifra_vhid; 46 }; 47 48 #ifdef _KERNEL 49 #include <sys/queue.h> 50 #include <sys/fnv_hash.h> 51 #include <sys/tree.h> 52 53 struct igmp_ifsoftc; 54 struct in_multi; 55 struct lltable; 56 57 /* 58 * IPv4 per-interface state. 59 */ 60 struct in_ifinfo { 61 struct lltable *ii_llt; /* ARP state */ 62 struct igmp_ifsoftc *ii_igmp; /* IGMP state */ 63 struct in_multi *ii_allhosts; /* 224.0.0.1 membership */ 64 }; 65 66 /* 67 * Interface address, Internet version. One of these structures 68 * is allocated for each Internet address on an interface. 69 * The ifaddr structure contains the protocol-independent part 70 * of the structure and is assumed to be first. 71 */ 72 struct in_ifaddr { 73 struct ifaddr ia_ifa; /* protocol-independent info */ 74 #define ia_ifp ia_ifa.ifa_ifp 75 #define ia_flags ia_ifa.ifa_flags 76 /* ia_subnet{,mask} in host order */ 77 u_long ia_subnet; /* subnet address */ 78 u_long ia_subnetmask; /* mask of subnet */ 79 LIST_ENTRY(in_ifaddr) ia_hash; /* entry in bucket of inet addresses */ 80 TAILQ_ENTRY(in_ifaddr) ia_link; /* list of internet addresses */ 81 struct sockaddr_in ia_addr; /* reserve space for interface name */ 82 struct sockaddr_in ia_dstaddr; /* reserve space for broadcast addr */ 83 #define ia_broadaddr ia_dstaddr 84 struct sockaddr_in ia_sockmask; /* reserve space for general netmask */ 85 }; 86 87 /* 88 * Given a pointer to an in_ifaddr (ifaddr), 89 * return a pointer to the addr as a sockaddr_in. 90 */ 91 #define IA_SIN(ia) (&(((struct in_ifaddr *)(ia))->ia_addr)) 92 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr)) 93 #define IA_MASKSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_sockmask)) 94 95 #define IN_LNAOF(in, ifa) \ 96 ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask)) 97 98 extern u_char inetctlerrmap[]; 99 100 #define LLTABLE(ifp) \ 101 ((struct in_ifinfo *)(ifp)->if_afdata[AF_INET])->ii_llt 102 /* 103 * Hash table for IP addresses. 104 */ 105 TAILQ_HEAD(in_ifaddrhead, in_ifaddr); 106 LIST_HEAD(in_ifaddrhashhead, in_ifaddr); 107 108 VNET_DECLARE(struct in_ifaddrhashhead *, in_ifaddrhashtbl); 109 VNET_DECLARE(struct in_ifaddrhead, in_ifaddrhead); 110 VNET_DECLARE(u_long, in_ifaddrhmask); /* mask for hash table */ 111 112 #define V_in_ifaddrhashtbl VNET(in_ifaddrhashtbl) 113 #define V_in_ifaddrhead VNET(in_ifaddrhead) 114 #define V_in_ifaddrhmask VNET(in_ifaddrhmask) 115 116 #define INADDR_NHASH_LOG2 9 117 #define INADDR_NHASH (1 << INADDR_NHASH_LOG2) 118 #define INADDR_HASHVAL(x) fnv_32_buf((&(x)), sizeof(x), FNV1_32_INIT) 119 #define INADDR_HASH(x) \ 120 (&V_in_ifaddrhashtbl[INADDR_HASHVAL(x) & V_in_ifaddrhmask]) 121 122 extern struct rwlock in_ifaddr_lock; 123 124 #define IN_IFADDR_LOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_LOCKED) 125 #define IN_IFADDR_RLOCK() rw_rlock(&in_ifaddr_lock) 126 #define IN_IFADDR_RLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_RLOCKED) 127 #define IN_IFADDR_RUNLOCK() rw_runlock(&in_ifaddr_lock) 128 #define IN_IFADDR_WLOCK() rw_wlock(&in_ifaddr_lock) 129 #define IN_IFADDR_WLOCK_ASSERT() rw_assert(&in_ifaddr_lock, RA_WLOCKED) 130 #define IN_IFADDR_WUNLOCK() rw_wunlock(&in_ifaddr_lock) 131 132 /* 133 * Macro for finding the internet address structure (in_ifaddr) 134 * corresponding to one of our IP addresses (in_addr). 135 */ 136 #define INADDR_TO_IFADDR(addr, ia) \ 137 /* struct in_addr addr; */ \ 138 /* struct in_ifaddr *ia; */ \ 139 do { \ 140 \ 141 LIST_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) \ 142 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) \ 143 break; \ 144 } while (0) 145 146 /* 147 * Macro for finding the interface (ifnet structure) corresponding to one 148 * of our IP addresses. 149 */ 150 #define INADDR_TO_IFP(addr, ifp) \ 151 /* struct in_addr addr; */ \ 152 /* struct ifnet *ifp; */ \ 153 { \ 154 struct in_ifaddr *ia; \ 155 \ 156 INADDR_TO_IFADDR(addr, ia); \ 157 (ifp) = (ia == NULL) ? NULL : ia->ia_ifp; \ 158 } 159 160 /* 161 * Macro for finding the internet address structure (in_ifaddr) corresponding 162 * to a given interface (ifnet structure). 163 */ 164 #define IFP_TO_IA(ifp, ia) \ 165 /* struct ifnet *ifp; */ \ 166 /* struct in_ifaddr *ia; */ \ 167 do { \ 168 IN_IFADDR_RLOCK(); \ 169 for ((ia) = TAILQ_FIRST(&V_in_ifaddrhead); \ 170 (ia) != NULL && (ia)->ia_ifp != (ifp); \ 171 (ia) = TAILQ_NEXT((ia), ia_link)) \ 172 continue; \ 173 if ((ia) != NULL) \ 174 ifa_ref(&(ia)->ia_ifa); \ 175 IN_IFADDR_RUNLOCK(); \ 176 } while (0) 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 * IPv4 multicast IGMP-layer source entry. 199 */ 200 struct ip_msource { 201 RB_ENTRY(ip_msource) ims_link; /* RB tree links */ 202 in_addr_t ims_haddr; /* host byte order */ 203 struct ims_st { 204 uint16_t ex; /* # of exclusive members */ 205 uint16_t in; /* # of inclusive members */ 206 } ims_st[2]; /* state at t0, t1 */ 207 uint8_t ims_stp; /* pending query */ 208 }; 209 210 /* 211 * IPv4 multicast PCB-layer source entry. 212 */ 213 struct in_msource { 214 RB_ENTRY(ip_msource) ims_link; /* RB tree links */ 215 in_addr_t ims_haddr; /* host byte order */ 216 uint8_t imsl_st[2]; /* state before/at commit */ 217 }; 218 219 RB_HEAD(ip_msource_tree, ip_msource); /* define struct ip_msource_tree */ 220 221 static __inline int 222 ip_msource_cmp(const struct ip_msource *a, const struct ip_msource *b) 223 { 224 225 if (a->ims_haddr < b->ims_haddr) 226 return (-1); 227 if (a->ims_haddr == b->ims_haddr) 228 return (0); 229 return (1); 230 } 231 RB_PROTOTYPE(ip_msource_tree, ip_msource, ims_link, ip_msource_cmp); 232 233 /* 234 * IPv4 multicast PCB-layer group filter descriptor. 235 */ 236 struct in_mfilter { 237 struct ip_msource_tree imf_sources; /* source list for (S,G) */ 238 u_long imf_nsrc; /* # of source entries */ 239 uint8_t imf_st[2]; /* state before/at commit */ 240 }; 241 242 /* 243 * IPv4 group descriptor. 244 * 245 * For every entry on an ifnet's if_multiaddrs list which represents 246 * an IP multicast group, there is one of these structures. 247 * 248 * If any source filters are present, then a node will exist in the RB-tree 249 * to permit fast lookup by source whenever an operation takes place. 250 * This permits pre-order traversal when we issue reports. 251 * Source filter trees are kept separately from the socket layer to 252 * greatly simplify locking. 253 * 254 * When IGMPv3 is active, inm_timer is the response to group query timer. 255 * The state-change timer inm_sctimer is separate; whenever state changes 256 * for the group the state change record is generated and transmitted, 257 * and kept if retransmissions are necessary. 258 * 259 * FUTURE: inm_link is now only used when groups are being purged 260 * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but 261 * because it is at the very start of the struct, we can't do this 262 * w/o breaking the ABI for ifmcstat. 263 */ 264 struct in_multi { 265 LIST_ENTRY(in_multi) inm_link; /* to-be-released by in_ifdetach */ 266 struct in_addr inm_addr; /* IP multicast address, convenience */ 267 struct ifnet *inm_ifp; /* back pointer to ifnet */ 268 struct ifmultiaddr *inm_ifma; /* back pointer to ifmultiaddr */ 269 u_int inm_timer; /* IGMPv1/v2 group / v3 query timer */ 270 u_int inm_state; /* state of the membership */ 271 void *inm_rti; /* unused, legacy field */ 272 u_int inm_refcount; /* reference count */ 273 274 /* New fields for IGMPv3 follow. */ 275 struct igmp_ifsoftc *inm_igi; /* IGMP info */ 276 SLIST_ENTRY(in_multi) inm_nrele; /* to-be-released by IGMP */ 277 struct ip_msource_tree inm_srcs; /* tree of sources */ 278 u_long inm_nsrc; /* # of tree entries */ 279 280 struct mbufq inm_scq; /* queue of pending 281 * state-change packets */ 282 struct timeval inm_lastgsrtv; /* Time of last G-S-R query */ 283 uint16_t inm_sctimer; /* state-change timer */ 284 uint16_t inm_scrv; /* state-change rexmit count */ 285 286 /* 287 * SSM state counters which track state at T0 (the time the last 288 * state-change report's RV timer went to zero) and T1 289 * (time of pending report, i.e. now). 290 * Used for computing IGMPv3 state-change reports. Several refcounts 291 * are maintained here to optimize for common use-cases. 292 */ 293 struct inm_st { 294 uint16_t iss_fmode; /* IGMP filter mode */ 295 uint16_t iss_asm; /* # of ASM listeners */ 296 uint16_t iss_ex; /* # of exclusive members */ 297 uint16_t iss_in; /* # of inclusive members */ 298 uint16_t iss_rec; /* # of recorded sources */ 299 } inm_st[2]; /* state at t0, t1 */ 300 }; 301 302 /* 303 * Helper function to derive the filter mode on a source entry 304 * from its internal counters. Predicates are: 305 * A source is only excluded if all listeners exclude it. 306 * A source is only included if no listeners exclude it, 307 * and at least one listener includes it. 308 * May be used by ifmcstat(8). 309 */ 310 static __inline uint8_t 311 ims_get_mode(const struct in_multi *inm, const struct ip_msource *ims, 312 uint8_t t) 313 { 314 315 t = !!t; 316 if (inm->inm_st[t].iss_ex > 0 && 317 inm->inm_st[t].iss_ex == ims->ims_st[t].ex) 318 return (MCAST_EXCLUDE); 319 else if (ims->ims_st[t].in > 0 && ims->ims_st[t].ex == 0) 320 return (MCAST_INCLUDE); 321 return (MCAST_UNDEFINED); 322 } 323 324 #ifdef SYSCTL_DECL 325 SYSCTL_DECL(_net_inet); 326 SYSCTL_DECL(_net_inet_ip); 327 SYSCTL_DECL(_net_inet_raw); 328 #endif 329 330 /* 331 * Lock macros for IPv4 layer multicast address lists. IPv4 lock goes 332 * before link layer multicast locks in the lock order. In most cases, 333 * consumers of IN_*_MULTI() macros should acquire the locks before 334 * calling them; users of the in_{add,del}multi() functions should not. 335 */ 336 extern struct mtx in_multi_mtx; 337 #define IN_MULTI_LOCK() mtx_lock(&in_multi_mtx) 338 #define IN_MULTI_UNLOCK() mtx_unlock(&in_multi_mtx) 339 #define IN_MULTI_LOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_OWNED) 340 #define IN_MULTI_UNLOCK_ASSERT() mtx_assert(&in_multi_mtx, MA_NOTOWNED) 341 342 /* Acquire an in_multi record. */ 343 static __inline void 344 inm_acquire_locked(struct in_multi *inm) 345 { 346 347 IN_MULTI_LOCK_ASSERT(); 348 ++inm->inm_refcount; 349 } 350 351 /* 352 * Return values for imo_multi_filter(). 353 */ 354 #define MCAST_PASS 0 /* Pass */ 355 #define MCAST_NOTGMEMBER 1 /* This host not a member of group */ 356 #define MCAST_NOTSMEMBER 2 /* This host excluded source */ 357 #define MCAST_MUTED 3 /* [deprecated] */ 358 359 struct rtentry; 360 struct route; 361 struct ip_moptions; 362 struct radix_node_head; 363 364 struct in_multi *inm_lookup_locked(struct ifnet *, const struct in_addr); 365 struct in_multi *inm_lookup(struct ifnet *, const struct in_addr); 366 int imo_multi_filter(const struct ip_moptions *, const struct ifnet *, 367 const struct sockaddr *, const struct sockaddr *); 368 void inm_commit(struct in_multi *); 369 void inm_clear_recorded(struct in_multi *); 370 void inm_print(const struct in_multi *); 371 int inm_record_source(struct in_multi *inm, const in_addr_t); 372 void inm_release(struct in_multi *); 373 void inm_release_locked(struct in_multi *); 374 struct in_multi * 375 in_addmulti(struct in_addr *, struct ifnet *); 376 void in_delmulti(struct in_multi *); 377 int in_joingroup(struct ifnet *, const struct in_addr *, 378 /*const*/ struct in_mfilter *, struct in_multi **); 379 int in_joingroup_locked(struct ifnet *, const struct in_addr *, 380 /*const*/ struct in_mfilter *, struct in_multi **); 381 int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *); 382 int in_leavegroup_locked(struct in_multi *, 383 /*const*/ struct in_mfilter *); 384 int in_control(struct socket *, u_long, caddr_t, struct ifnet *, 385 struct thread *); 386 int in_addprefix(struct in_ifaddr *, int); 387 int in_scrubprefix(struct in_ifaddr *, u_int); 388 void ip_input(struct mbuf *); 389 void ip_direct_input(struct mbuf *); 390 void in_ifadown(struct ifaddr *ifa, int); 391 struct mbuf *ip_fastforward(struct mbuf *); 392 void *in_domifattach(struct ifnet *); 393 void in_domifdetach(struct ifnet *, void *); 394 395 396 /* XXX */ 397 void in_rtalloc_ign(struct route *ro, u_long ignflags, u_int fibnum); 398 void in_rtalloc(struct route *ro, u_int fibnum); 399 struct rtentry *in_rtalloc1(struct sockaddr *, int, u_long, u_int); 400 void in_rtredirect(struct sockaddr *, struct sockaddr *, 401 struct sockaddr *, int, struct sockaddr *, u_int); 402 int in_rtrequest(int, struct sockaddr *, 403 struct sockaddr *, struct sockaddr *, int, struct rtentry **, u_int); 404 #endif /* _KERNEL */ 405 406 /* INET6 stuff */ 407 #include <netinet6/in6_var.h> 408 409 #endif /* _NETINET_IN_VAR_H_ */ 410