bsd/netinet/in_var.h

   1 /*
   2  * Copyright (c) 2000-2011 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  * $FreeBSD: src/sys/netinet/in_var.h,v 1.33.2.2 2001/07/17 10:50:01 ru Exp $
  62  */
  63
  64 #ifndef _NETINET_IN_VAR_H_
  65 #define _NETINET_IN_VAR_H_
  66 #include <sys/appleapiopts.h>
  67
  68 #include <sys/queue.h>
  69 #ifdef __APPLE__
  70 #include <sys/kern_event.h>
  71 #endif
  72
  73 #ifdef XNU_KERNEL_PRIVATE
  74 #include <net/route.h>
  75
  76 /*
  77  * Interface address, Internet version.  One of these structures
  78  * is allocated for each Internet address on an interface.
  79  * The ifaddr structure contains the protocol-independent part
  80  * of the structure and is assumed to be first.
  81  */
  82 struct in_ifaddr {
  83         struct ifaddr           ia_ifa;         /* protocol-independent info */
  84 #define ia_ifp                  ia_ifa.ifa_ifp
  85 #define ia_flags                ia_ifa.ifa_flags
  86                                                 /* ia_{,sub}net{,mask} in host order */
  87         u_int32_t               ia_net;         /* network number of interface */
  88         u_int32_t               ia_netmask;     /* mask of net part */
  89         u_int32_t               ia_subnet;      /* subnet number, including net */
  90         u_int32_t               ia_subnetmask;  /* mask of subnet part */
  91         struct in_addr          ia_netbroadcast; /* to recognize net broadcasts */
  92         TAILQ_ENTRY(in_ifaddr)  ia_link;        /* tailq macro glue */
  93         struct sockaddr_in      ia_addr;        /* reserve space for interface name */
  94         struct sockaddr_in      ia_dstaddr;     /* reserve space for broadcast addr */
  95 #define ia_broadaddr            ia_dstaddr
  96         struct sockaddr_in      ia_sockmask;    /* reserve space for general netmask */
  97         TAILQ_ENTRY(in_ifaddr)  ia_hash;        /* hash bucket entry */
  98 };
  99 #endif /* XNU_KERNEL_PRIVATE */
 100
 101 struct  in_aliasreq {
 102         char                    ifra_name[IFNAMSIZ];    /* if name, e.g. "en0" */
 103         struct sockaddr_in      ifra_addr;
 104         struct sockaddr_in      ifra_broadaddr;
 105 #define ifra_dstaddr            ifra_broadaddr
 106         struct sockaddr_in      ifra_mask;
 107         u_int32_t               ifra_unused;    /* not used: used to be 'dlt' */
 108 };
 109
 110 /*
 111  * Event data, internet style.
 112  */
 113 struct kev_in_data {
 114         struct net_event_data   link_data;
 115         struct in_addr          ia_addr;
 116         u_int32_t               ia_net;         /* network number of interface */
 117         u_int32_t               ia_netmask;     /* mask of net part */
 118         u_int32_t               ia_subnet;      /* subnet number, including net */
 119         u_int32_t               ia_subnetmask;  /* mask of subnet part */
 120         struct in_addr          ia_netbroadcast;/* to recognize net broadcasts */
 121         struct in_addr          ia_dstaddr;
 122 };
 123
 124 struct kev_in_collision {
 125         struct net_event_data   link_data;      /* link colliding arp was received on */
 126         struct in_addr          ia_ipaddr;      /* IP address we and another node are using */
 127         u_char                  hw_len;         /* length of hardware address */
 128         u_char                  hw_addr[0];     /* variable length hardware address */
 129 };
 130
 131 #ifdef __APPLE_API_PRIVATE
 132 struct kev_in_portinuse {
 133         u_int16_t               port;           /* conflicting port number in host order */
 134         u_int32_t               req_pid;        /* PID port requestor */
 135         u_int32_t               reserved[2];
 136 };
 137 #endif
 138
 139
 140 /*
 141  * Define inet event subclass and specific inet events.
 142  */
 143
 144 #define KEV_INET_SUBCLASS 1
 145
 146 #define KEV_INET_NEW_ADDR     1
 147 #define KEV_INET_CHANGED_ADDR 2
 148 #define KEV_INET_ADDR_DELETED 3
 149 #define KEV_INET_SIFDSTADDR   4
 150 #define KEV_INET_SIFBRDADDR   5
 151 #define KEV_INET_SIFNETMASK   6
 152 #define KEV_INET_ARPCOLLISION 7 /* use kev_in_collision */
 153
 154 #ifdef __APPLE_API_PRIVATE
 155 #define KEV_INET_PORTINUSE    8 /* use ken_in_portinuse */
 156 #endif
 157
 158 #ifdef XNU_KERNEL_PRIVATE
 159 #include <net/if_var.h>
 160 #include <kern/locks.h>
 161 #include <sys/tree.h>
 162 /*
 163  * Given a pointer to an in_ifaddr (ifaddr),
 164  * return a pointer to the addr as a sockaddr_in.
 165  */
 166 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
 167 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
 168
 169 #define IN_LNAOF(in, ifa) \
 170         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 171
 172 /*
 173  * Hash table for IPv4 addresses.
 174  */
 175 __private_extern__ TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
 176 __private_extern__ TAILQ_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
 177 __private_extern__ lck_rw_t *in_ifaddr_rwlock;
 178
 179 #define INADDR_HASH(x)  (&in_ifaddrhashtbl[inaddr_hashval(x)])
 180
 181 extern  struct  ifqueue ipintrq;                /* ip packet input queue */
 182 extern  struct  in_addr zeroin_addr;
 183 extern  u_char  inetctlerrmap[];
 184
 185 extern int apple_hwcksum_tx;
 186 extern int apple_hwcksum_rx;
 187
 188 /*
 189  * Macro for finding the interface (ifnet structure) corresponding to one
 190  * of our IP addresses.
 191  */
 192 #define INADDR_TO_IFP(addr, ifp)                                        \
 193         /* struct in_addr addr; */                                      \
 194         /* struct ifnet *ifp; */                                        \
 195 {                                                                       \
 196         struct in_ifaddr *ia;                                           \
 197                                                                         \
 198         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 199         TAILQ_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) {        \
 200                 IFA_LOCK_SPIN(&ia->ia_ifa);                             \
 201                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) {     \
 202                         IFA_UNLOCK(&ia->ia_ifa);                        \
 203                         break;                                          \
 204                 }                                                       \
 205                 IFA_UNLOCK(&ia->ia_ifa);                                \
 206         }                                                               \
 207         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp;                       \
 208         lck_rw_done(in_ifaddr_rwlock);                                  \
 209 }
 210
 211 /*
 212  * Macro for finding the internet address structure (in_ifaddr) corresponding
 213  * to a given interface (ifnet structure).  Caller is responsible for freeing
 214  * the reference.
 215  */
 216 #define IFP_TO_IA(ifp, ia)                                              \
 217         /* struct ifnet *ifp; */                                        \
 218         /* struct in_ifaddr *ia; */                                     \
 219 {                                                                       \
 220         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 221         for ((ia) = TAILQ_FIRST(&in_ifaddrhead);                        \
 222             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
 223             (ia) = TAILQ_NEXT((ia), ia_link))                           \
 224                 continue;                                               \
 225         if ((ia) != NULL)                                               \
 226                 IFA_ADDREF(&(ia)->ia_ifa);                              \
 227         lck_rw_done(in_ifaddr_rwlock);                                  \
 228 }
 229
 230 /*
 231  * This information should be part of the ifnet structure but we don't wish
 232  * to change that - as it might break a number of things
 233  */
 234
 235 /*
 236  * Legacy IPv4 IGMP per-link structure.
 237  */
 238 struct router_info {
 239         struct ifnet *rti_ifp;
 240         int    rti_type; /* type of router which is querier on this interface */
 241         int    rti_time; /* # of slow timeouts since last old query */
 242         SLIST_ENTRY(router_info) rti_list;
 243 };
 244
 245 /*
 246  * IPv4 multicast IGMP-layer source entry.
 247  */
 248 struct ip_msource {
 249         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 250         in_addr_t               ims_haddr;      /* host byte order */
 251         struct ims_st {
 252                 uint16_t        ex;             /* # of exclusive members */
 253                 uint16_t        in;             /* # of inclusive members */
 254         }                       ims_st[2];      /* state at t0, t1 */
 255         uint8_t                 ims_stp;        /* pending query */
 256 };
 257
 258 /*
 259  * IPv4 multicast PCB-layer source entry.
 260  */
 261 struct in_msource {
 262         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 263         in_addr_t               ims_haddr;      /* host byte order */
 264         uint8_t                 imsl_st[2];     /* state before/at commit */
 265 };
 266
 267 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
 268
 269 RB_PROTOTYPE_SC_PREV(__private_extern__, ip_msource_tree, ip_msource,
 270     ims_link, ip_msource_cmp);
 271
 272 /*
 273  * IPv4 multicast PCB-layer group filter descriptor.
 274  */
 275 struct in_mfilter {
 276         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
 277         u_long                  imf_nsrc;    /* # of source entries */
 278         uint8_t                 imf_st[2];   /* state before/at commit */
 279 };
 280
 281 struct igmp_ifinfo;
 282
 283 /*
 284  * IPv4 group descriptor.
 285  *
 286  * For every entry on an ifnet's if_multiaddrs list which represents
 287  * an IP multicast group, there is one of these structures.
 288  *
 289  * If any source filters are present, then a node will exist in the RB-tree
 290  * to permit fast lookup by source whenever an operation takes place.
 291  * This permits pre-order traversal when we issue reports.
 292  * Source filter trees are kept separately from the socket layer to
 293  * greatly simplify locking.
 294  *
 295  * When IGMPv3 is active, inm_timer is the response to group query timer.
 296  * The state-change timer inm_sctimer is separate; whenever state changes
 297  * for the group the state change record is generated and transmitted,
 298  * and kept if retransmissions are necessary.
 299  *
 300  * FUTURE: inm_link is now only used when groups are being purged
 301  * on a detaching ifnet. It could be demoted to a SLIST_ENTRY, but
 302  * because it is at the very start of the struct, we can't do this
 303  * w/o breaking the ABI for ifmcstat.
 304  */
 305 struct in_multi {
 306         decl_lck_mtx_data(, inm_lock);
 307         u_int32_t inm_refcount;         /* reference count */
 308         u_int32_t inm_reqcnt;           /* request count for this address */
 309         u_int32_t inm_debug;            /* see ifa_debug flags */
 310         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
 311         struct  in_addr inm_addr;       /* IP multicast address, convenience */
 312         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
 313         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
 314         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer  */
 315         u_int   inm_state;              /*  state of the membership */
 316         void *inm_rti;                  /* unused, legacy field */
 317
 318         /* New fields for IGMPv3 follow. */
 319         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
 320         SLIST_ENTRY(in_multi)    inm_dtle;      /* detached waiting for rele */
 321         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
 322         u_int32_t                inm_nrelecnt;  /* deferred release count */
 323         struct ip_msource_tree   inm_srcs;      /* tree of sources */
 324         u_long                   inm_nsrc;      /* # of tree entries */
 325
 326         struct ifqueue           inm_scq;       /* queue of pending
 327                                                  * state-change packets */
 328         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
 329         uint16_t                 inm_sctimer;   /* state-change timer */
 330         uint16_t                 inm_scrv;      /* state-change rexmit count */
 331
 332         /*
 333          * SSM state counters which track state at T0 (the time the last
 334          * state-change report's RV timer went to zero) and T1
 335          * (time of pending report, i.e. now).
 336          * Used for computing IGMPv3 state-change reports. Several refcounts
 337          * are maintained here to optimize for common use-cases.
 338          */
 339         struct inm_st {
 340                 uint16_t        iss_fmode;      /* IGMP filter mode */
 341                 uint16_t        iss_asm;        /* # of ASM listeners */
 342                 uint16_t        iss_ex;         /* # of exclusive members */
 343                 uint16_t        iss_in;         /* # of inclusive members */
 344                 uint16_t        iss_rec;        /* # of recorded sources */
 345         }                       inm_st[2];      /* state at t0, t1 */
 346
 347         void (*inm_trace)               /* callback fn for tracing refs */
 348             (struct in_multi *, int);
 349 };
 350
 351 #define INM_LOCK_ASSERT_HELD(_inm)                                      \
 352         lck_mtx_assert(&(_inm)->inm_lock, LCK_MTX_ASSERT_OWNED)
 353
 354 #define INM_LOCK_ASSERT_NOTHELD(_inm)                                   \
 355         lck_mtx_assert(&(_inm)->inm_lock, LCK_MTX_ASSERT_NOTOWNED)
 356
 357 #define INM_LOCK(_inm)                                                  \
 358         lck_mtx_lock(&(_inm)->inm_lock)
 359
 360 #define INM_LOCK_SPIN(_inm)                                             \
 361         lck_mtx_lock_spin(&(_inm)->inm_lock)
 362
 363 #define INM_CONVERT_LOCK(_inm) do {                                     \
 364         INM_LOCK_ASSERT_HELD(_inm);                                     \
 365         lck_mtx_convert_spin(&(_inm)->inm_lock);                        \
 366 } while (0)
 367
 368 #define INM_UNLOCK(_inm)                                                \
 369         lck_mtx_unlock(&(_inm)->inm_lock)
 370
 371 #define INM_ADDREF(_inm)                                                \
 372         inm_addref(_inm, 0)
 373
 374 #define INM_ADDREF_LOCKED(_inm)                                         \
 375         inm_addref(_inm, 1)
 376
 377 #define INM_REMREF(_inm)                                                \
 378         inm_remref(_inm, 0)
 379
 380 #define INM_REMREF_LOCKED(_inm)                                         \
 381         inm_remref(_inm, 1)
 382
 383 #ifdef SYSCTL_DECL
 384 SYSCTL_DECL(_net_inet_ip);
 385 SYSCTL_DECL(_net_inet_raw);
 386 #endif
 387
 388 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
 389
 390 /*
 391  * Structure used by macros below to remember position when stepping through
 392  * all of the in_multi records.
 393  */
 394 struct in_multistep {
 395         struct in_multi *i_inm;
 396 };
 397
 398 /*
 399  * Macro for looking up the in_multi record for a given IP multicast address
 400  * on a given interface.  If no matching record is found, "inm" is set null.
 401  *
 402  * We do this differently compared other BSD implementations; instead of
 403  * walking the if_multiaddrs list at the interface and returning the
 404  * ifma_protospec value of a matching entry, we search the global list
 405  * of in_multi records and find it that way.  Otherwise either the two
 406  * structures (in_multi, ifmultiaddr) need to be ref counted both ways,
 407  * which will make things too complicated, or they need to reside in the
 408  * same protected domain, which they aren't.
 409  *
 410  * Must be called with in_multihead_lock held.
 411  */
 412 #define IN_LOOKUP_MULTI(addr, ifp, inm)                                 \
 413         /* struct in_addr *addr; */                                     \
 414         /* struct ifnet *ifp; */                                        \
 415         /* struct in_multi *inm; */                                     \
 416 do {                                                                    \
 417         struct in_multistep _step;                                      \
 418         IN_FIRST_MULTI(_step, inm);                                     \
 419         while ((inm) != NULL) {                                         \
 420                 INM_LOCK_SPIN(inm);                                     \
 421                 if ((inm)->inm_ifp == (ifp) &&                          \
 422                     (inm)->inm_addr.s_addr == (addr)->s_addr) {         \
 423                         INM_ADDREF_LOCKED(inm);                         \
 424                         INM_UNLOCK(inm);                                \
 425                         break;                                          \
 426                 }                                                       \
 427                 INM_UNLOCK(inm);                                        \
 428                 IN_NEXT_MULTI(_step, inm);                              \
 429         }                                                               \
 430 } while (0)
 431
 432 /*
 433  * Macro to step through all of the in_multi records, one at a time.
 434  * The current position is remembered in "step", which the caller must
 435  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 436  * and get the first record.  Both macros return a NULL "inm" when there
 437  * are no remaining records.
 438  *
 439  * Must be called with in_multihead_lock held.
 440  */
 441 #define IN_NEXT_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         if (((inm) = (step).i_inm) != NULL)                             \
 447                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link);       \
 448 } while (0)
 449
 450 #define IN_FIRST_MULTI(step, inm)                                       \
 451         /* struct in_multistep step; */                                 \
 452         /* struct in_multi *inm; */                                     \
 453 do {                                                                    \
 454         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 455         (step).i_inm = LIST_FIRST(&in_multihead);                       \
 456         IN_NEXT_MULTI((step), (inm));                                   \
 457 } while (0)
 458
 459 struct  route;
 460 struct  ip_moptions;
 461
 462 /*
 463  * Return values for imo_multi_filter().
 464  */
 465 #define MCAST_PASS              0       /* Pass */
 466 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
 467 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
 468 #define MCAST_MUTED             3       /* [deprecated] */
 469
 470 extern void in_ifaddr_init(void);
 471 extern int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
 472     const struct sockaddr *, const struct sockaddr *);
 473 extern int imo_clone(struct ip_moptions *, struct ip_moptions *);
 474 extern void inm_commit(struct in_multi *);
 475 extern void inm_clear_recorded(struct in_multi *);
 476 extern void inm_print(const struct in_multi *);
 477 extern int inm_record_source(struct in_multi *inm, const in_addr_t);
 478 extern void inm_release(struct in_multi *);
 479 extern void in_multi_init(void);
 480 extern struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
 481 extern void in_delmulti(struct in_multi *);
 482 extern int in_leavegroup(struct in_multi *, /*const*/ struct in_mfilter *);
 483 extern int in_multi_detach(struct in_multi *);
 484 extern void inm_addref(struct in_multi *, int);
 485 extern void inm_remref(struct in_multi *, int);
 486 extern void inm_purge(struct in_multi *);
 487 extern uint8_t ims_get_mode(const struct in_multi *,
 488     const struct ip_msource *, uint8_t);
 489 extern int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
 490     struct proc *);
 491 extern void in_rtqdrain(void);
 492 extern struct radix_node *in_validate(struct radix_node *);
 493 extern void ip_input(struct mbuf *);
 494 extern int in_ifadown(struct ifaddr *ifa, int);
 495 extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
 496 extern u_int32_t inaddr_hashval(u_int32_t);
 497 extern void in_purgeaddrs(struct ifnet *);
 498 extern void     imf_leave(struct in_mfilter *);
 499 extern void     imf_purge(struct in_mfilter *);
 500
 501 struct inpcb;
 502
 503 __private_extern__ int inp_join_group(struct inpcb *, struct sockopt *);
 504 __private_extern__ int inp_leave_group(struct inpcb *, struct sockopt *);
 505 __private_extern__ void in_multihead_lock_exclusive(void);
 506 __private_extern__ void in_multihead_lock_shared(void);
 507 __private_extern__ void in_multihead_lock_assert(int);
 508 __private_extern__ void in_multihead_lock_done(void);
 509 #endif /* XNU_KERNEL_PRIVATE */
 510
 511 /* INET6 stuff */
 512 #include <netinet6/in6_var.h>
 513
 514 #endif /* _NETINET_IN_VAR_H_ */