bsd/netinet/in_var.h

   1 /*
   2  * Copyright (c) 2000-2013 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. The rights granted to you under the License
  10  * may not be used to create, or enable the creation or redistribution of,
  11  * unlawful or unlicensed copies of an Apple operating system, or to
  12  * circumvent, violate, or enable the circumvention or violation of, any
  13  * terms of an Apple operating system software license agreement.
  14  *
  15  * Please obtain a copy of the License at
  16  * http://www.opensource.apple.com/apsl/ and read it before using this file.
  17  *
  18  * The Original Code and all software distributed under the License are
  19  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  20  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  21  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  22  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  23  * Please see the License for the specific language governing rights and
  24  * limitations under the License.
  25  *
  26  * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
  27  */
  28 /*
  29  * Copyright (c) 1985, 1986, 1993
  30  *      The Regents of the University of California.  All rights reserved.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  *
  60  *      @(#)in_var.h    8.2 (Berkeley) 1/9/95
  61  */
  62
  63 #ifndef _NETINET_IN_VAR_H_
  64 #define _NETINET_IN_VAR_H_
  65 #include <sys/appleapiopts.h>
  66
  67 #include <sys/queue.h>
  68 #include <sys/kern_event.h>
  69
  70 #ifdef BSD_KERNEL_PRIVATE
  71 #include <net/route.h>
  72
  73 /*
  74  * Interface address, Internet version.  One of these structures
  75  * is allocated for each Internet address on an interface.
  76  * The ifaddr structure contains the protocol-independent part
  77  * of the structure and is assumed to be first.
  78  */
  79 struct in_ifaddr {
  80         struct ifaddr ia_ifa;           /* protocol-independent info */
  81 #define ia_ifp          ia_ifa.ifa_ifp
  82 #define ia_flags        ia_ifa.ifa_flags
  83                                         /* ia_{,sub}net{,mask} in host order */
  84         u_int32_t ia_net;               /* network number of interface */
  85         u_int32_t ia_netmask;           /* mask of net part */
  86         u_int32_t ia_subnet;            /* subnet number, including net */
  87         u_int32_t ia_subnetmask;        /* mask of subnet part */
  88         struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
  89         TAILQ_ENTRY(in_ifaddr) ia_link; /* tailq macro glue */
  90         struct sockaddr_in ia_addr;     /* reserve space for interface name */
  91         struct sockaddr_in ia_dstaddr;  /* reserve space for broadcast addr */
  92 #define ia_broadaddr    ia_dstaddr
  93         struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
  94         TAILQ_ENTRY(in_ifaddr) ia_hash; /* hash bucket entry */
  95 };
  96
  97 #define ifatoia(ifa)    ((struct in_ifaddr *)(void *)(ifa))
  98 #endif /* BSD_KERNEL_PRIVATE */
  99
 100 struct in_aliasreq {
 101         char ifra_name[IFNAMSIZ];       /* if name, e.g. "en0" */
 102         struct sockaddr_in ifra_addr;
 103         struct sockaddr_in ifra_broadaddr;
 104 #define ifra_dstaddr    ifra_broadaddr
 105         struct sockaddr_in ifra_mask;
 106 };
 107
 108 /*
 109  * Event data, inet style.
 110  */
 111 struct kev_in_data {
 112         struct net_event_data link_data;
 113         struct in_addr ia_addr;         /* interface address */
 114         u_int32_t ia_net;               /* network number of interface */
 115         u_int32_t ia_netmask;           /* mask of net part */
 116         u_int32_t ia_subnet;            /* subnet number, including net */
 117         u_int32_t ia_subnetmask;        /* mask of subnet part */
 118         struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
 119         struct in_addr ia_dstaddr;
 120 };
 121
 122 struct kev_in_collision {
 123         struct net_event_data link_data; /* link where ARP was received on */
 124         struct in_addr ia_ipaddr;       /* conflicting IP address */
 125         u_char hw_len;                  /* length of hardware address */
 126         u_char hw_addr[0];              /* variable length hardware address */
 127 };
 128
 129 #ifdef __APPLE_API_PRIVATE
 130 struct kev_in_portinuse {
 131         u_int16_t port;         /* conflicting port number in host order */
 132         u_int32_t req_pid;      /* PID port requestor */
 133         u_int32_t reserved[2];
 134 };
 135 #endif /* __APPLE_API_PRIVATE */
 136
 137 /*
 138  * Define inet event subclass and specific inet events.
 139  */
 140 #define KEV_INET_SUBCLASS               1 /* inet subclass identifier */
 141
 142 #define KEV_INET_NEW_ADDR               1 /* Userland configured IP address */
 143 #define KEV_INET_CHANGED_ADDR           2 /* Address changed event */
 144 #define KEV_INET_ADDR_DELETED           3 /* IPv6 address was deleted */
 145 #define KEV_INET_SIFDSTADDR             4 /* Dest. address was set */
 146 #define KEV_INET_SIFBRDADDR             5 /* Broadcast address was set */
 147 #define KEV_INET_SIFNETMASK             6 /* Netmask was set */
 148 #define KEV_INET_ARPCOLLISION           7 /* ARP collision detected */
 149 #ifdef __APPLE_API_PRIVATE
 150 #define KEV_INET_PORTINUSE              8 /* use ken_in_portinuse */
 151 #endif
 152
 153 #ifdef BSD_KERNEL_PRIVATE
 154 #include <net/if_var.h>
 155 #include <kern/locks.h>
 156 #include <sys/tree.h>
 157 /*
 158  * Given a pointer to an in_ifaddr (ifaddr),
 159  * return a pointer to the addr as a sockaddr_in.
 160  */
 161 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
 162 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
 163
 164 #define IN_LNAOF(in, ifa) \
 165         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 166
 167 /*
 168  * Hash table for IPv4 addresses.
 169  */
 170 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
 171 extern TAILQ_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
 172 extern lck_rw_t *in_ifaddr_rwlock;
 173
 174 #define INADDR_HASH(x)  (&in_ifaddrhashtbl[inaddr_hashval(x)])
 175
 176 extern  u_char  inetctlerrmap[];
 177
 178 /*
 179  * Macro for finding the interface (ifnet structure) corresponding to one
 180  * of our IP addresses.
 181  */
 182 #define INADDR_TO_IFP(addr, ifp)                                        \
 183         /* struct in_addr addr; */                                      \
 184         /* struct ifnet *ifp; */                                        \
 185 {                                                                       \
 186         struct in_ifaddr *ia;                                           \
 187                                                                         \
 188         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 189         TAILQ_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) {        \
 190                 IFA_LOCK_SPIN(&ia->ia_ifa);                             \
 191                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) {     \
 192                         IFA_UNLOCK(&ia->ia_ifa);                        \
 193                         break;                                          \
 194                 }                                                       \
 195                 IFA_UNLOCK(&ia->ia_ifa);                                \
 196         }                                                               \
 197         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp;                       \
 198         lck_rw_done(in_ifaddr_rwlock);                                  \
 199 }
 200
 201 /*
 202  * Macro for finding the internet address structure (in_ifaddr) corresponding
 203  * to a given interface (ifnet structure).  Caller is responsible for freeing
 204  * the reference.
 205  */
 206 #define IFP_TO_IA(ifp, ia)                                              \
 207         /* struct ifnet *ifp; */                                        \
 208         /* struct in_ifaddr *ia; */                                     \
 209 {                                                                       \
 210         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 211         for ((ia) = TAILQ_FIRST(&in_ifaddrhead);                        \
 212             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
 213             (ia) = TAILQ_NEXT((ia), ia_link))                           \
 214                 continue;                                               \
 215         if ((ia) != NULL)                                               \
 216                 IFA_ADDREF(&(ia)->ia_ifa);                              \
 217         lck_rw_done(in_ifaddr_rwlock);                                  \
 218 }
 219
 220 /*
 221  * This information should be part of the ifnet structure but we don't wish
 222  * to change that - as it might break a number of things
 223  */
 224
 225 /*
 226  * Legacy IPv4 IGMP per-link structure.
 227  */
 228 struct router_info {
 229         struct ifnet *rti_ifp;
 230         int    rti_type; /* type of router which is querier on this interface */
 231         int    rti_time; /* # of slow timeouts since last old query */
 232         SLIST_ENTRY(router_info) rti_list;
 233 };
 234
 235 /*
 236  * IPv4 multicast IGMP-layer source entry.
 237  */
 238 struct ip_msource {
 239         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 240         in_addr_t               ims_haddr;      /* host byte order */
 241         struct ims_st {
 242                 uint16_t        ex;             /* # of exclusive members */
 243                 uint16_t        in;             /* # of inclusive members */
 244         }                       ims_st[2];      /* state at t0, t1 */
 245         uint8_t                 ims_stp;        /* pending query */
 246 };
 247
 248 /*
 249  * IPv4 multicast PCB-layer source entry.
 250  */
 251 struct in_msource {
 252         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 253         in_addr_t               ims_haddr;      /* host byte order */
 254         uint8_t                 imsl_st[2];     /* state before/at commit */
 255 };
 256
 257 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
 258
 259 RB_PROTOTYPE_SC_PREV(__private_extern__, ip_msource_tree, ip_msource,
 260     ims_link, ip_msource_cmp);
 261
 262 /*
 263  * IPv4 multicast PCB-layer group filter descriptor.
 264  */
 265 struct in_mfilter {
 266         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
 267         u_long                  imf_nsrc;    /* # of source entries */
 268         uint8_t                 imf_st[2];   /* state before/at commit */
 269 };
 270
 271 struct igmp_ifinfo;
 272
 273 /*
 274  * IPv4 group descriptor.
 275  *
 276  * For every entry on an ifnet's if_multiaddrs list which represents
 277  * an IP multicast group, there is one of these structures.
 278  *
 279  * If any source filters are present, then a node will exist in the RB-tree
 280  * to permit fast lookup by source whenever an operation takes place.
 281  * This permits pre-order traversal when we issue reports.
 282  * Source filter trees are kept separately from the socket layer to
 283  * greatly simplify locking.
 284  *
 285  * When IGMPv3 is active, inm_timer is the response to group query timer.
 286  * The state-change timer inm_sctimer is separate; whenever state changes
 287  * for the group the state change record is generated and transmitted,
 288  * and kept if retransmissions are necessary.
 289  *
 290  * The request count here is a count of requests for this address, not a
 291  * count of pointers to this structure.
 292  *
 293  * FUTURE: inm_link is now only used when groups are being purged
 294  * on a detaching ifnet.  It could be demoted to a SLIST_ENTRY.
 295  */
 296 struct in_multi {
 297         decl_lck_mtx_data(, inm_lock);
 298         u_int32_t inm_refcount;         /* reference count */
 299         u_int32_t inm_reqcnt;           /* request count for this address */
 300         u_int32_t inm_debug;            /* see ifa_debug flags */
 301         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
 302         struct  in_addr inm_addr;       /* IP multicast address, convenience */
 303         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
 304         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
 305         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer  */
 306         u_int   inm_state;              /*  state of the membership */
 307         void *inm_rti;                  /* unused, legacy field */
 308
 309         /* New fields for IGMPv3 follow. */
 310         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
 311         SLIST_ENTRY(in_multi)    inm_dtle;      /* detached waiting for rele */
 312         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
 313         u_int32_t                inm_nrelecnt;  /* deferred release count */
 314         struct ip_msource_tree   inm_srcs;      /* tree of sources */
 315         u_long                   inm_nsrc;      /* # of tree entries */
 316
 317         struct ifqueue           inm_scq;       /* queue of pending
 318                                                  * state-change packets */
 319         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
 320         uint16_t                 inm_sctimer;   /* state-change timer */
 321         uint16_t                 inm_scrv;      /* state-change rexmit count */
 322
 323         /*
 324          * SSM state counters which track state at T0 (the time the last
 325          * state-change report's RV timer went to zero) and T1
 326          * (time of pending report, i.e. now).
 327          * Used for computing IGMPv3 state-change reports. Several refcounts
 328          * are maintained here to optimize for common use-cases.
 329          */
 330         struct inm_st {
 331                 uint16_t        iss_fmode;      /* IGMP filter mode */
 332                 uint16_t        iss_asm;        /* # of ASM listeners */
 333                 uint16_t        iss_ex;         /* # of exclusive members */
 334                 uint16_t        iss_in;         /* # of inclusive members */
 335                 uint16_t        iss_rec;        /* # of recorded sources */
 336         }                       inm_st[2];      /* state at t0, t1 */
 337
 338         void (*inm_trace)               /* callback fn for tracing refs */
 339             (struct in_multi *, int);
 340 };
 341
 342 #define INM_LOCK_ASSERT_HELD(_inm)                                      \
 343         lck_mtx_assert(&(_inm)->inm_lock, LCK_MTX_ASSERT_OWNED)
 344
 345 #define INM_LOCK_ASSERT_NOTHELD(_inm)                                   \
 346         lck_mtx_assert(&(_inm)->inm_lock, LCK_MTX_ASSERT_NOTOWNED)
 347
 348 #define INM_LOCK(_inm)                                                  \
 349         lck_mtx_lock(&(_inm)->inm_lock)
 350
 351 #define INM_LOCK_SPIN(_inm)                                             \
 352         lck_mtx_lock_spin(&(_inm)->inm_lock)
 353
 354 #define INM_CONVERT_LOCK(_inm) do {                                     \
 355         INM_LOCK_ASSERT_HELD(_inm);                                     \
 356         lck_mtx_convert_spin(&(_inm)->inm_lock);                        \
 357 } while (0)
 358
 359 #define INM_UNLOCK(_inm)                                                \
 360         lck_mtx_unlock(&(_inm)->inm_lock)
 361
 362 #define INM_ADDREF(_inm)                                                \
 363         inm_addref(_inm, 0)
 364
 365 #define INM_ADDREF_LOCKED(_inm)                                         \
 366         inm_addref(_inm, 1)
 367
 368 #define INM_REMREF(_inm)                                                \
 369         inm_remref(_inm, 0)
 370
 371 #define INM_REMREF_LOCKED(_inm)                                         \
 372         inm_remref(_inm, 1)
 373
 374 #ifdef SYSCTL_DECL
 375 SYSCTL_DECL(_net_inet_ip);
 376 SYSCTL_DECL(_net_inet_raw);
 377 #endif
 378
 379 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
 380
 381 /*
 382  * Structure used by macros below to remember position when stepping through
 383  * all of the in_multi records.
 384  */
 385 struct in_multistep {
 386         struct in_multi *i_inm;
 387 };
 388
 389 /*
 390  * Macro for looking up the in_multi record for a given IP multicast address
 391  * on a given interface.  If no matching record is found, "inm" is set null.
 392  *
 393  * We do this differently compared other BSD implementations; instead of
 394  * walking the if_multiaddrs list at the interface and returning the
 395  * ifma_protospec value of a matching entry, we search the global list
 396  * of in_multi records and find it that way.  Otherwise either the two
 397  * structures (in_multi, ifmultiaddr) need to be ref counted both ways,
 398  * which will make things too complicated, or they need to reside in the
 399  * same protected domain, which they aren't.
 400  *
 401  * Must be called with in_multihead_lock held.
 402  */
 403 #define IN_LOOKUP_MULTI(addr, ifp, inm)                                 \
 404         /* struct in_addr *addr; */                                     \
 405         /* struct ifnet *ifp; */                                        \
 406         /* struct in_multi *inm; */                                     \
 407 do {                                                                    \
 408         struct in_multistep _step;                                      \
 409         IN_FIRST_MULTI(_step, inm);                                     \
 410         while ((inm) != NULL) {                                         \
 411                 INM_LOCK_SPIN(inm);                                     \
 412                 if ((inm)->inm_ifp == (ifp) &&                          \
 413                     (inm)->inm_addr.s_addr == (addr)->s_addr) {         \
 414                         INM_ADDREF_LOCKED(inm);                         \
 415                         INM_UNLOCK(inm);                                \
 416                         break;                                          \
 417                 }                                                       \
 418                 INM_UNLOCK(inm);                                        \
 419                 IN_NEXT_MULTI(_step, inm);                              \
 420         }                                                               \
 421 } while (0)
 422
 423 /*
 424  * Macro to step through all of the in_multi records, one at a time.
 425  * The current position is remembered in "step", which the caller must
 426  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 427  * and get the first record.  Both macros return a NULL "inm" when there
 428  * are no remaining records.
 429  *
 430  * Must be called with in_multihead_lock held.
 431  */
 432 #define IN_NEXT_MULTI(step, inm)                                        \
 433         /* struct in_multistep  step; */                                \
 434         /* struct in_multi *inm; */                                     \
 435 do {                                                                    \
 436         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 437         if (((inm) = (step).i_inm) != NULL)                             \
 438                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link);       \
 439 } while (0)
 440
 441 #define IN_FIRST_MULTI(step, inm)                                       \
 442         /* struct in_multistep step; */                                 \
 443         /* struct in_multi *inm; */                                     \
 444 do {                                                                    \
 445         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 446         (step).i_inm = LIST_FIRST(&in_multihead);                       \
 447         IN_NEXT_MULTI((step), (inm));                                   \
 448 } while (0)
 449
 450 extern lck_mtx_t *inet_domain_mutex;
 451 extern struct domain *inetdomain;
 452
 453 struct ip_moptions;
 454 struct inpcb;
 455
 456 /*
 457  * Return values for imo_multi_filter().
 458  */
 459 #define MCAST_PASS              0       /* Pass */
 460 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
 461 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
 462 #define MCAST_MUTED             3       /* [deprecated] */
 463
 464 extern u_int32_t ipv4_ll_arp_aware;
 465
 466 extern void in_ifaddr_init(void);
 467 extern int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
 468     const struct sockaddr *, const struct sockaddr *);
 469 extern int imo_clone(struct inpcb *, struct inpcb *);
 470 extern void inm_commit(struct in_multi *);
 471 extern void inm_clear_recorded(struct in_multi *);
 472 extern void inm_print(const struct in_multi *);
 473 extern int inm_record_source(struct in_multi *inm, const in_addr_t);
 474 extern void inm_release(struct in_multi *);
 475 extern void in_multi_init(void);
 476 extern struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
 477 extern void in_delmulti(struct in_multi *);
 478 extern int in_leavegroup(struct in_multi *, struct in_mfilter *);
 479 extern int in_multi_detach(struct in_multi *);
 480 extern void inm_addref(struct in_multi *, int);
 481 extern void inm_remref(struct in_multi *, int);
 482 extern void inm_purge(struct in_multi *);
 483 extern uint8_t ims_get_mode(const struct in_multi *,
 484     const struct ip_msource *, uint8_t);
 485 extern int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
 486     struct proc *);
 487 extern int in_inithead(void **, int);
 488 extern void in_rtqdrain(void);
 489 extern struct radix_node *in_validate(struct radix_node *);
 490 extern void ip_input(struct mbuf *);
 491 extern int in_ifadown(struct ifaddr *ifa, int);
 492 extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
 493 extern u_int32_t inaddr_hashval(u_int32_t);
 494 extern void in_purgeaddrs(struct ifnet *);
 495 extern int in_selectaddrs(int af, struct sockaddr_list **,
 496     struct sockaddr_entry **, struct sockaddr_list **,
 497     struct sockaddr_entry **);
 498 extern void gre_input(struct mbuf *, int);
 499 extern void imf_leave(struct in_mfilter *);
 500 extern void imf_purge(struct in_mfilter *);
 501 extern int inp_join_group(struct inpcb *, struct sockopt *);
 502 extern int inp_leave_group(struct inpcb *, struct sockopt *);
 503 extern void in_multihead_lock_exclusive(void);
 504 extern void in_multihead_lock_shared(void);
 505 extern void in_multihead_lock_assert(int);
 506 extern void in_multihead_lock_done(void);
 507 #endif /* BSD_KERNEL_PRIVATE */
 508 /* INET6 stuff */
 509 #include <netinet6/in6_var.h>
 510 #endif /* _NETINET_IN_VAR_H_ */