bsd/netinet/in_var.h

   1 /*
   2  * Copyright (c) 2000-2016 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 #include <net/net_kev.h>
  70
  71 #ifdef BSD_KERNEL_PRIVATE
  72 #include <net/route.h>
  73
  74 /*
  75  * Interface address, Internet version.  One of these structures
  76  * is allocated for each Internet address on an interface.
  77  * The ifaddr structure contains the protocol-independent part
  78  * of the structure and is assumed to be first.
  79  */
  80 struct in_ifaddr {
  81         struct ifaddr ia_ifa;           /* protocol-independent info */
  82 #define ia_ifp          ia_ifa.ifa_ifp
  83 #define ia_flags        ia_ifa.ifa_flags
  84                                         /* ia_{,sub}net{,mask} in host order */
  85         u_int32_t ia_net;               /* network number of interface */
  86         u_int32_t ia_netmask;           /* mask of net part */
  87         u_int32_t ia_subnet;            /* subnet number, including net */
  88         u_int32_t ia_subnetmask;        /* mask of subnet part */
  89         struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
  90         TAILQ_ENTRY(in_ifaddr) ia_link; /* tailq macro glue */
  91         struct sockaddr_in ia_addr;     /* reserve space for interface name */
  92         struct sockaddr_in ia_dstaddr;  /* reserve space for broadcast addr */
  93 #define ia_broadaddr    ia_dstaddr
  94         struct sockaddr_in ia_sockmask; /* reserve space for general netmask */
  95         TAILQ_ENTRY(in_ifaddr) ia_hash; /* hash bucket entry */
  96 };
  97
  98 #define ifatoia(ifa)    ((struct in_ifaddr *)(void *)(ifa))
  99 #endif /* BSD_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 };
 108
 109 /*
 110  * Event data, inet style.
 111  */
 112 struct kev_in_data {
 113         struct net_event_data link_data;
 114         struct in_addr ia_addr;         /* interface address */
 115         u_int32_t ia_net;               /* network number of interface */
 116         u_int32_t ia_netmask;           /* mask of net part */
 117         u_int32_t ia_subnet;            /* subnet number, including net */
 118         u_int32_t ia_subnetmask;        /* mask of subnet part */
 119         struct in_addr ia_netbroadcast; /* to recognize net broadcasts */
 120         struct in_addr ia_dstaddr;
 121 };
 122
 123 struct kev_in_collision {
 124         struct net_event_data link_data; /* link where ARP was received on */
 125         struct in_addr ia_ipaddr;       /* conflicting IP address */
 126         u_char hw_len;                  /* length of hardware address */
 127         u_char hw_addr[0];              /* variable length hardware address */
 128 };
 129
 130 struct kev_in_arpfailure {
 131         struct net_event_data link_data; /* link where ARP is being sent */
 132 };
 133
 134 struct kev_in_arpalive {
 135         struct net_event_data link_data; /* link where ARP was received */
 136 };
 137
 138
 139 #ifdef __APPLE_API_PRIVATE
 140 struct kev_in_portinuse {
 141         u_int16_t port;         /* conflicting port number in host order */
 142         u_int32_t req_pid;      /* PID port requestor */
 143         u_int32_t reserved[2];
 144 };
 145 #endif /* __APPLE_API_PRIVATE */
 146
 147 #ifdef BSD_KERNEL_PRIVATE
 148 #include <net/if.h>
 149 #include <net/if_var.h>
 150 #include <net/if_llatbl.h>
 151 #include <kern/locks.h>
 152 #include <sys/tree.h>
 153 /*
 154  * Given a pointer to an in_ifaddr (ifaddr),
 155  * return a pointer to the addr as a sockaddr_in.
 156  */
 157 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
 158 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
 159
 160 #define IN_LNAOF(in, ifa) \
 161         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 162
 163 /*
 164  * Hash table for IPv4 addresses.
 165  */
 166 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
 167 extern TAILQ_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
 168 extern lck_rw_t *in_ifaddr_rwlock;
 169
 170 #define INADDR_HASH(x)  (&in_ifaddrhashtbl[inaddr_hashval(x)])
 171
 172 extern  u_char  inetctlerrmap[];
 173
 174 /*
 175  * Macro for finding the interface (ifnet structure) corresponding to one
 176  * of our IP addresses.
 177  */
 178 #define INADDR_TO_IFP(addr, ifp)                                        \
 179         /* struct in_addr addr; */                                      \
 180         /* struct ifnet *ifp; */                                        \
 181 {                                                                       \
 182         struct in_ifaddr *ia;                                           \
 183                                                                         \
 184         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 185         TAILQ_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) {        \
 186                 IFA_LOCK_SPIN(&ia->ia_ifa);                             \
 187                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) {     \
 188                         IFA_UNLOCK(&ia->ia_ifa);                        \
 189                         break;                                          \
 190                 }                                                       \
 191                 IFA_UNLOCK(&ia->ia_ifa);                                \
 192         }                                                               \
 193         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp;                       \
 194         lck_rw_done(in_ifaddr_rwlock);                                  \
 195 }
 196
 197 /*
 198  * Macro for finding the internet address structure (in_ifaddr) corresponding
 199  * to a given interface (ifnet structure).  Caller is responsible for freeing
 200  * the reference.
 201  */
 202 #define IFP_TO_IA(ifp, ia)                                              \
 203         /* struct ifnet *ifp; */                                        \
 204         /* struct in_ifaddr *ia; */                                     \
 205 {                                                                       \
 206         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 207         for ((ia) = TAILQ_FIRST(&in_ifaddrhead);                        \
 208             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
 209             (ia) = TAILQ_NEXT((ia), ia_link))                           \
 210                 continue;                                               \
 211         if ((ia) != NULL)                                               \
 212                 IFA_ADDREF(&(ia)->ia_ifa);                              \
 213         lck_rw_done(in_ifaddr_rwlock);                                  \
 214 }
 215
 216 /*
 217  * This information should be part of the ifnet structure but we don't wish
 218  * to change that - as it might break a number of things
 219  */
 220
 221 /*
 222  * Legacy IPv4 IGMP per-link structure.
 223  */
 224 struct router_info {
 225         struct ifnet *rti_ifp;
 226         int    rti_type; /* type of router which is querier on this interface */
 227         int    rti_time; /* # of slow timeouts since last old query */
 228         SLIST_ENTRY(router_info) rti_list;
 229 };
 230
 231 /*
 232  * IPv4 multicast IGMP-layer source entry.
 233  */
 234 struct ip_msource {
 235         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 236         in_addr_t               ims_haddr;      /* host byte order */
 237         struct ims_st {
 238                 uint16_t        ex;             /* # of exclusive members */
 239                 uint16_t        in;             /* # of inclusive members */
 240         }                       ims_st[2];      /* state at t0, t1 */
 241         uint8_t                 ims_stp;        /* pending query */
 242 };
 243
 244 /*
 245  * IPv4 multicast PCB-layer source entry.
 246  */
 247 struct in_msource {
 248         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 249         in_addr_t               ims_haddr;      /* host byte order */
 250         uint8_t                 imsl_st[2];     /* state before/at commit */
 251 };
 252
 253 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
 254
 255 RB_PROTOTYPE_SC_PREV(__private_extern__, ip_msource_tree, ip_msource,
 256     ims_link, ip_msource_cmp);
 257
 258 /*
 259  * IPv4 multicast PCB-layer group filter descriptor.
 260  */
 261 struct in_mfilter {
 262         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
 263         u_long                  imf_nsrc;    /* # of source entries */
 264         uint8_t                 imf_st[2];   /* state before/at commit */
 265 };
 266
 267 struct igmp_ifinfo;
 268
 269 /*
 270  * IPv4 group descriptor.
 271  *
 272  * For every entry on an ifnet's if_multiaddrs list which represents
 273  * an IP multicast group, there is one of these structures.
 274  *
 275  * If any source filters are present, then a node will exist in the RB-tree
 276  * to permit fast lookup by source whenever an operation takes place.
 277  * This permits pre-order traversal when we issue reports.
 278  * Source filter trees are kept separately from the socket layer to
 279  * greatly simplify locking.
 280  *
 281  * When IGMPv3 is active, inm_timer is the response to group query timer.
 282  * The state-change timer inm_sctimer is separate; whenever state changes
 283  * for the group the state change record is generated and transmitted,
 284  * and kept if retransmissions are necessary.
 285  *
 286  * The request count here is a count of requests for this address, not a
 287  * count of pointers to this structure.
 288  *
 289  * FUTURE: inm_link is now only used when groups are being purged
 290  * on a detaching ifnet.  It could be demoted to a SLIST_ENTRY.
 291  */
 292 struct in_multi {
 293         decl_lck_mtx_data(, inm_lock);
 294         u_int32_t inm_refcount;         /* reference count */
 295         u_int32_t inm_reqcnt;           /* request count for this address */
 296         u_int32_t inm_debug;            /* see ifa_debug flags */
 297         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
 298         struct  in_addr inm_addr;       /* IP multicast address, convenience */
 299         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
 300         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
 301         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer  */
 302         u_int   inm_state;              /*  state of the membership */
 303         void *inm_rti;                  /* unused, legacy field */
 304
 305         /* New fields for IGMPv3 follow. */
 306         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
 307         SLIST_ENTRY(in_multi)    inm_dtle;      /* detached waiting for rele */
 308         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
 309         u_int32_t                inm_nrelecnt;  /* deferred release count */
 310         struct ip_msource_tree   inm_srcs;      /* tree of sources */
 311         u_long                   inm_nsrc;      /* # of tree entries */
 312
 313         struct ifqueue           inm_scq;       /* queue of pending
 314                                                  * state-change packets */
 315         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
 316         uint16_t                 inm_sctimer;   /* state-change timer */
 317         uint16_t                 inm_scrv;      /* state-change rexmit count */
 318
 319         /*
 320          * SSM state counters which track state at T0 (the time the last
 321          * state-change report's RV timer went to zero) and T1
 322          * (time of pending report, i.e. now).
 323          * Used for computing IGMPv3 state-change reports. Several refcounts
 324          * are maintained here to optimize for common use-cases.
 325          */
 326         struct inm_st {
 327                 uint16_t        iss_fmode;      /* IGMP filter mode */
 328                 uint16_t        iss_asm;        /* # of ASM listeners */
 329                 uint16_t        iss_ex;         /* # of exclusive members */
 330                 uint16_t        iss_in;         /* # of inclusive members */
 331                 uint16_t        iss_rec;        /* # of recorded sources */
 332         }                       inm_st[2];      /* state at t0, t1 */
 333
 334         void (*inm_trace)               /* callback fn for tracing refs */
 335             (struct in_multi *, int);
 336 };
 337
 338 #define INM_LOCK_ASSERT_HELD(_inm)                                      \
 339         LCK_MTX_ASSERT(&(_inm)->inm_lock, LCK_MTX_ASSERT_OWNED)
 340
 341 #define INM_LOCK_ASSERT_NOTHELD(_inm)                                   \
 342         LCK_MTX_ASSERT(&(_inm)->inm_lock, LCK_MTX_ASSERT_NOTOWNED)
 343
 344 #define INM_LOCK(_inm)                                                  \
 345         lck_mtx_lock(&(_inm)->inm_lock)
 346
 347 #define INM_LOCK_SPIN(_inm)                                             \
 348         lck_mtx_lock_spin(&(_inm)->inm_lock)
 349
 350 #define INM_CONVERT_LOCK(_inm) do {                                     \
 351         INM_LOCK_ASSERT_HELD(_inm);                                     \
 352         lck_mtx_convert_spin(&(_inm)->inm_lock);                        \
 353 } while (0)
 354
 355 #define INM_UNLOCK(_inm)                                                \
 356         lck_mtx_unlock(&(_inm)->inm_lock)
 357
 358 #define INM_ADDREF(_inm)                                                \
 359         inm_addref(_inm, 0)
 360
 361 #define INM_ADDREF_LOCKED(_inm)                                         \
 362         inm_addref(_inm, 1)
 363
 364 #define INM_REMREF(_inm)                                                \
 365         inm_remref(_inm, 0)
 366
 367 #define INM_REMREF_LOCKED(_inm)                                         \
 368         inm_remref(_inm, 1)
 369
 370 #ifdef SYSCTL_DECL
 371 SYSCTL_DECL(_net_inet_ip);
 372 SYSCTL_DECL(_net_inet_raw);
 373 #endif
 374
 375 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
 376
 377 /*
 378  * Structure used by macros below to remember position when stepping through
 379  * all of the in_multi records.
 380  */
 381 struct in_multistep {
 382         struct in_multi *i_inm;
 383 };
 384
 385 /*
 386  * Macro for looking up the in_multi record for a given IP multicast address
 387  * on a given interface.  If no matching record is found, "inm" is set null.
 388  *
 389  * We do this differently compared other BSD implementations; instead of
 390  * walking the if_multiaddrs list at the interface and returning the
 391  * ifma_protospec value of a matching entry, we search the global list
 392  * of in_multi records and find it that way.  Otherwise either the two
 393  * structures (in_multi, ifmultiaddr) need to be ref counted both ways,
 394  * which will make things too complicated, or they need to reside in the
 395  * same protected domain, which they aren't.
 396  *
 397  * Must be called with in_multihead_lock held.
 398  */
 399 #define IN_LOOKUP_MULTI(addr, ifp, inm)                                 \
 400         /* struct in_addr *addr; */                                     \
 401         /* struct ifnet *ifp; */                                        \
 402         /* struct in_multi *inm; */                                     \
 403 do {                                                                    \
 404         struct in_multistep _step;                                      \
 405         IN_FIRST_MULTI(_step, inm);                                     \
 406         while ((inm) != NULL) {                                         \
 407                 INM_LOCK_SPIN(inm);                                     \
 408                 if ((inm)->inm_ifp == (ifp) &&                          \
 409                     (inm)->inm_addr.s_addr == (addr)->s_addr) {         \
 410                         INM_ADDREF_LOCKED(inm);                         \
 411                         INM_UNLOCK(inm);                                \
 412                         break;                                          \
 413                 }                                                       \
 414                 INM_UNLOCK(inm);                                        \
 415                 IN_NEXT_MULTI(_step, inm);                              \
 416         }                                                               \
 417 } while (0)
 418
 419 /*
 420  * Macro to step through all of the in_multi records, one at a time.
 421  * The current position is remembered in "step", which the caller must
 422  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 423  * and get the first record.  Both macros return a NULL "inm" when there
 424  * are no remaining records.
 425  *
 426  * Must be called with in_multihead_lock held.
 427  */
 428 #define IN_NEXT_MULTI(step, inm)                                        \
 429         /* struct in_multistep  step; */                                \
 430         /* struct in_multi *inm; */                                     \
 431 do {                                                                    \
 432         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 433         if (((inm) = (step).i_inm) != NULL)                             \
 434                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link);       \
 435 } while (0)
 436
 437 #define IN_FIRST_MULTI(step, inm)                                       \
 438         /* struct in_multistep step; */                                 \
 439         /* struct in_multi *inm; */                                     \
 440 do {                                                                    \
 441         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 442         (step).i_inm = LIST_FIRST(&in_multihead);                       \
 443         IN_NEXT_MULTI((step), (inm));                                   \
 444 } while (0)
 445
 446 extern lck_mtx_t *inet_domain_mutex;
 447 extern struct domain *inetdomain;
 448
 449 struct ip_moptions;
 450 struct inpcb;
 451
 452 /*
 453  * Return values for imo_multi_filter().
 454  */
 455 #define MCAST_PASS              0       /* Pass */
 456 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
 457 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
 458 #define MCAST_MUTED             3       /* [deprecated] */
 459
 460 /*
 461  * Per-interface IPv4 structures.
 462  */
 463 struct in_ifextra {
 464         uint32_t                netsig_len;
 465         u_int8_t                netsig[IFNET_SIGNATURELEN];
 466         struct lltable          *ii_llt;        /* ARP state */
 467 };
 468 #define IN_IFEXTRA(_ifp)        ((struct in_ifextra *)(_ifp->if_inetdata))
 469 #define LLTABLE(ifp)            ((IN_IFEXTRA(ifp) == NULL) ? NULL : IN_IFEXTRA(ifp)->ii_llt)
 470
 471 extern u_int32_t ipv4_ll_arp_aware;
 472
 473 extern void in_ifaddr_init(void);
 474 extern int imo_multi_filter(const struct ip_moptions *,
 475     const struct ifnet *, const struct sockaddr_in *,
 476     const struct sockaddr_in *);
 477 extern int imo_clone(struct inpcb *, struct inpcb *);
 478 extern void inm_commit(struct in_multi *);
 479 extern void inm_clear_recorded(struct in_multi *);
 480 extern void inm_print(const struct in_multi *);
 481 extern int inm_record_source(struct in_multi *inm, const in_addr_t);
 482 extern void inm_release(struct in_multi *);
 483 extern void in_multi_init(void);
 484 extern struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
 485 extern void in_delmulti(struct in_multi *);
 486 extern int in_leavegroup(struct in_multi *, struct in_mfilter *);
 487 extern int in_multi_detach(struct in_multi *);
 488 extern void inm_addref(struct in_multi *, int);
 489 extern void inm_remref(struct in_multi *, int);
 490 extern void inm_purge(struct in_multi *);
 491 extern uint8_t ims_get_mode(const struct in_multi *,
 492     const struct ip_msource *, uint8_t);
 493 extern int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
 494     struct proc *);
 495 extern int in_inithead(void **, int);
 496 extern void in_rtqdrain(void);
 497 extern struct radix_node *in_validate(struct radix_node *);
 498 extern void ip_input(struct mbuf *);
 499 extern void ip_input_process_list(struct mbuf *);
 500 extern int in_ifadown(struct ifaddr *ifa, int);
 501 extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
 502 extern u_int32_t inaddr_hashval(u_int32_t);
 503 extern void in_purgeaddrs(struct ifnet *);
 504 extern void gre_input(struct mbuf *, int);
 505 extern void imf_leave(struct in_mfilter *);
 506 extern void imf_purge(struct in_mfilter *);
 507 extern int inp_join_group(struct inpcb *, struct sockopt *);
 508 extern int inp_leave_group(struct inpcb *, struct sockopt *);
 509 extern void in_multihead_lock_exclusive(void);
 510 extern void in_multihead_lock_shared(void);
 511 extern void in_multihead_lock_assert(int);
 512 extern void in_multihead_lock_done(void);
 513 #endif /* BSD_KERNEL_PRIVATE */
 514 /* INET6 stuff */
 515 #include <netinet6/in6_var.h>
 516 #endif /* _NETINET_IN_VAR_H_ */