bsd/netinet/in_var.h

   1 /*
   2  * Copyright (c) 2000-2019 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 #ifdef PRIVATE
 139 /*
 140  * Common structure for KEV_SOCKET_SUBCLASS
 141  * Have to place here to avoid declaration dependencies.
 142  */
 143 struct kev_socket_event_data {
 144         union sockaddr_in_4_6 kev_sockname;
 145         union sockaddr_in_4_6 kev_peername;
 146 };
 147
 148 struct kev_socket_closed {
 149         struct kev_socket_event_data ev_data;
 150 };
 151 #endif /* PRIVATE */
 152
 153 #ifdef __APPLE_API_PRIVATE
 154 struct kev_in_portinuse {
 155         u_int16_t port;         /* conflicting port number in host order */
 156         u_int32_t req_pid;      /* PID port requestor */
 157         u_int32_t reserved[2];
 158 };
 159 #endif /* __APPLE_API_PRIVATE */
 160
 161 #ifdef BSD_KERNEL_PRIVATE
 162 extern void socket_post_kev_msg(uint32_t, struct kev_socket_event_data *,
 163     uint32_t);
 164 extern void socket_post_kev_msg_closed(struct socket *);
 165
 166 #include <net/if.h>
 167 #include <net/if_var.h>
 168 #include <net/if_llatbl.h>
 169 #include <kern/locks.h>
 170 #include <sys/tree.h>
 171 /*
 172  * Given a pointer to an in_ifaddr (ifaddr),
 173  * return a pointer to the addr as a sockaddr_in.
 174  */
 175 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
 176 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
 177
 178 #define IN_LNAOF(in, ifa) \
 179         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 180
 181 /*
 182  * Hash table for IPv4 addresses.
 183  */
 184 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
 185 extern TAILQ_HEAD(in_ifaddrhashhead, in_ifaddr) * in_ifaddrhashtbl;
 186 extern lck_rw_t *in_ifaddr_rwlock;
 187
 188 #define INADDR_HASH(x)  (&in_ifaddrhashtbl[inaddr_hashval(x)])
 189
 190 extern  u_char  inetctlerrmap[];
 191
 192 /*
 193  * Macro for finding the interface (ifnet structure) corresponding to one
 194  * of our IP addresses.
 195  */
 196 #define INADDR_TO_IFP(addr, ifp)                                        \
 197         /* struct in_addr addr; */                                      \
 198         /* struct ifnet *ifp; */                                        \
 199 {                                                                       \
 200         struct in_ifaddr *ia;                                           \
 201                                                                         \
 202         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 203         TAILQ_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) {        \
 204                 IFA_LOCK_SPIN(&ia->ia_ifa);                             \
 205                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) {     \
 206                         IFA_UNLOCK(&ia->ia_ifa);                        \
 207                         break;                                          \
 208                 }                                                       \
 209                 IFA_UNLOCK(&ia->ia_ifa);                                \
 210         }                                                               \
 211         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp;                       \
 212         lck_rw_done(in_ifaddr_rwlock);                                  \
 213 }
 214
 215 /*
 216  * Macro for finding the internet address structure (in_ifaddr) corresponding
 217  * to a given interface (ifnet structure).  Caller is responsible for freeing
 218  * the reference.
 219  */
 220 #define IFP_TO_IA(ifp, ia)                                              \
 221         /* struct ifnet *ifp; */                                        \
 222         /* struct in_ifaddr *ia; */                                     \
 223 {                                                                       \
 224         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 225         for ((ia) = TAILQ_FIRST(&in_ifaddrhead);                        \
 226             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
 227             (ia) = TAILQ_NEXT((ia), ia_link))                           \
 228                 continue;                                               \
 229         if ((ia) != NULL)                                               \
 230                 IFA_ADDREF(&(ia)->ia_ifa);                              \
 231         lck_rw_done(in_ifaddr_rwlock);                                  \
 232 }
 233
 234 /*
 235  * This information should be part of the ifnet structure but we don't wish
 236  * to change that - as it might break a number of things
 237  */
 238
 239 /*
 240  * Legacy IPv4 IGMP per-link structure.
 241  */
 242 struct router_info {
 243         struct ifnet *rti_ifp;
 244         int    rti_type; /* type of router which is querier on this interface */
 245         int    rti_time; /* # of slow timeouts since last old query */
 246         SLIST_ENTRY(router_info) rti_list;
 247 };
 248
 249 /*
 250  * IPv4 multicast IGMP-layer source entry.
 251  */
 252 struct ip_msource {
 253         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 254         in_addr_t               ims_haddr;      /* host byte order */
 255         struct ims_st {
 256                 uint16_t        ex;             /* # of exclusive members */
 257                 uint16_t        in;             /* # of inclusive members */
 258         }                       ims_st[2];      /* state at t0, t1 */
 259         uint8_t                 ims_stp;        /* pending query */
 260 };
 261
 262 /*
 263  * IPv4 multicast PCB-layer source entry.
 264  */
 265 struct in_msource {
 266         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 267         in_addr_t               ims_haddr;      /* host byte order */
 268         uint8_t                 imsl_st[2];     /* state before/at commit */
 269 };
 270
 271 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
 272
 273 RB_PROTOTYPE_SC_PREV(__private_extern__, ip_msource_tree, ip_msource,
 274     ims_link, ip_msource_cmp);
 275
 276 /*
 277  * IPv4 multicast PCB-layer group filter descriptor.
 278  */
 279 struct in_mfilter {
 280         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
 281         u_long                  imf_nsrc;    /* # of source entries */
 282         uint8_t                 imf_st[2];   /* state before/at commit */
 283 };
 284
 285 struct igmp_ifinfo;
 286
 287 /*
 288  * IPv4 group descriptor.
 289  *
 290  * For every entry on an ifnet's if_multiaddrs list which represents
 291  * an IP multicast group, there is one of these structures.
 292  *
 293  * If any source filters are present, then a node will exist in the RB-tree
 294  * to permit fast lookup by source whenever an operation takes place.
 295  * This permits pre-order traversal when we issue reports.
 296  * Source filter trees are kept separately from the socket layer to
 297  * greatly simplify locking.
 298  *
 299  * When IGMPv3 is active, inm_timer is the response to group query timer.
 300  * The state-change timer inm_sctimer is separate; whenever state changes
 301  * for the group the state change record is generated and transmitted,
 302  * and kept if retransmissions are necessary.
 303  *
 304  * The request count here is a count of requests for this address, not a
 305  * count of pointers to this structure.
 306  *
 307  * FUTURE: inm_link is now only used when groups are being purged
 308  * on a detaching ifnet.  It could be demoted to a SLIST_ENTRY.
 309  */
 310 struct in_multi {
 311         decl_lck_mtx_data(, inm_lock);
 312         u_int32_t inm_refcount;         /* reference count */
 313         u_int32_t inm_reqcnt;           /* request count for this address */
 314         u_int32_t inm_debug;            /* see ifa_debug flags */
 315         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
 316         struct  in_addr inm_addr;       /* IP multicast address, convenience */
 317         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
 318         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
 319         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer  */
 320         u_int   inm_state;              /*  state of the membership */
 321         void *inm_rti;                  /* unused, legacy field */
 322
 323         /* New fields for IGMPv3 follow. */
 324         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
 325         SLIST_ENTRY(in_multi)    inm_dtle;      /* detached waiting for rele */
 326         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
 327         u_int32_t                inm_nrelecnt;  /* deferred release count */
 328         struct ip_msource_tree   inm_srcs;      /* tree of sources */
 329         u_long                   inm_nsrc;      /* # of tree entries */
 330
 331         struct ifqueue           inm_scq;       /* queue of pending
 332                                                  * state-change packets */
 333         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
 334         uint16_t                 inm_sctimer;   /* state-change timer */
 335         uint16_t                 inm_scrv;      /* state-change rexmit count */
 336
 337         /*
 338          * SSM state counters which track state at T0 (the time the last
 339          * state-change report's RV timer went to zero) and T1
 340          * (time of pending report, i.e. now).
 341          * Used for computing IGMPv3 state-change reports. Several refcounts
 342          * are maintained here to optimize for common use-cases.
 343          */
 344         struct inm_st {
 345                 uint16_t        iss_fmode;      /* IGMP filter mode */
 346                 uint16_t        iss_asm;        /* # of ASM listeners */
 347                 uint16_t        iss_ex;         /* # of exclusive members */
 348                 uint16_t        iss_in;         /* # of inclusive members */
 349                 uint16_t        iss_rec;        /* # of recorded sources */
 350         }                       inm_st[2];      /* state at t0, t1 */
 351
 352         void (*inm_trace)               /* callback fn for tracing refs */
 353         (struct in_multi *, int);
 354 };
 355
 356 #define INM_LOCK_ASSERT_HELD(_inm)                                      \
 357         LCK_MTX_ASSERT(&(_inm)->inm_lock, LCK_MTX_ASSERT_OWNED)
 358
 359 #define INM_LOCK_ASSERT_NOTHELD(_inm)                                   \
 360         LCK_MTX_ASSERT(&(_inm)->inm_lock, LCK_MTX_ASSERT_NOTOWNED)
 361
 362 #define INM_LOCK(_inm)                                                  \
 363         lck_mtx_lock(&(_inm)->inm_lock)
 364
 365 #define INM_LOCK_SPIN(_inm)                                             \
 366         lck_mtx_lock_spin(&(_inm)->inm_lock)
 367
 368 #define INM_CONVERT_LOCK(_inm) do {                                     \
 369         INM_LOCK_ASSERT_HELD(_inm);                                     \
 370         lck_mtx_convert_spin(&(_inm)->inm_lock);                        \
 371 } while (0)
 372
 373 #define INM_UNLOCK(_inm)                                                \
 374         lck_mtx_unlock(&(_inm)->inm_lock)
 375
 376 #define INM_ADDREF(_inm)                                                \
 377         inm_addref(_inm, 0)
 378
 379 #define INM_ADDREF_LOCKED(_inm)                                         \
 380         inm_addref(_inm, 1)
 381
 382 #define INM_REMREF(_inm)                                                \
 383         inm_remref(_inm, 0)
 384
 385 #define INM_REMREF_LOCKED(_inm)                                         \
 386         inm_remref(_inm, 1)
 387
 388 #ifdef SYSCTL_DECL
 389 SYSCTL_DECL(_net_inet_ip);
 390 SYSCTL_DECL(_net_inet_raw);
 391 #endif
 392
 393 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
 394
 395 /*
 396  * Structure used by macros below to remember position when stepping through
 397  * all of the in_multi records.
 398  */
 399 struct in_multistep {
 400         struct in_multi *i_inm;
 401 };
 402
 403 /*
 404  * Macro for looking up the in_multi record for a given IP multicast address
 405  * on a given interface.  If no matching record is found, "inm" is set null.
 406  *
 407  * We do this differently compared other BSD implementations; instead of
 408  * walking the if_multiaddrs list at the interface and returning the
 409  * ifma_protospec value of a matching entry, we search the global list
 410  * of in_multi records and find it that way.  Otherwise either the two
 411  * structures (in_multi, ifmultiaddr) need to be ref counted both ways,
 412  * which will make things too complicated, or they need to reside in the
 413  * same protected domain, which they aren't.
 414  *
 415  * Must be called with in_multihead_lock held.
 416  */
 417 #define IN_LOOKUP_MULTI(addr, ifp, inm)                                 \
 418         /* struct in_addr *addr; */                                     \
 419         /* struct ifnet *ifp; */                                        \
 420         /* struct in_multi *inm; */                                     \
 421 do {                                                                    \
 422         struct in_multistep _step;                                      \
 423         IN_FIRST_MULTI(_step, inm);                                     \
 424         while ((inm) != NULL) {                                         \
 425                 INM_LOCK_SPIN(inm);                                     \
 426                 if ((inm)->inm_ifp == (ifp) &&                          \
 427                     (inm)->inm_addr.s_addr == (addr)->s_addr) {         \
 428                         INM_ADDREF_LOCKED(inm);                         \
 429                         INM_UNLOCK(inm);                                \
 430                         break;                                          \
 431                 }                                                       \
 432                 INM_UNLOCK(inm);                                        \
 433                 IN_NEXT_MULTI(_step, inm);                              \
 434         }                                                               \
 435 } while (0)
 436
 437 /*
 438  * Macro to step through all of the in_multi records, one at a time.
 439  * The current position is remembered in "step", which the caller must
 440  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 441  * and get the first record.  Both macros return a NULL "inm" when there
 442  * are no remaining records.
 443  *
 444  * Must be called with in_multihead_lock held.
 445  */
 446 #define IN_NEXT_MULTI(step, inm)                                        \
 447         /* struct in_multistep  step; */                                \
 448         /* struct in_multi *inm; */                                     \
 449 do {                                                                    \
 450         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 451         if (((inm) = (step).i_inm) != NULL)                             \
 452                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link);       \
 453 } while (0)
 454
 455 #define IN_FIRST_MULTI(step, inm)                                       \
 456         /* struct in_multistep step; */                                 \
 457         /* struct in_multi *inm; */                                     \
 458 do {                                                                    \
 459         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 460         (step).i_inm = LIST_FIRST(&in_multihead);                       \
 461         IN_NEXT_MULTI((step), (inm));                                   \
 462 } while (0)
 463
 464 extern lck_mtx_t *inet_domain_mutex;
 465 extern struct domain *inetdomain;
 466
 467 struct ip_moptions;
 468 struct inpcb;
 469
 470 /*
 471  * Return values for imo_multi_filter().
 472  */
 473 #define MCAST_PASS              0       /* Pass */
 474 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
 475 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
 476 #define MCAST_MUTED             3       /* [deprecated] */
 477
 478 /*
 479  * Per-interface IPv4 structures.
 480  */
 481 struct in_ifextra {
 482         uint32_t                netsig_len;
 483         u_int8_t                netsig[IFNET_SIGNATURELEN];
 484         struct lltable          *ii_llt;        /* ARP state */
 485 };
 486 #define IN_IFEXTRA(_ifp)        ((struct in_ifextra *)(_ifp->if_inetdata))
 487 #define LLTABLE(ifp)            ((IN_IFEXTRA(ifp) == NULL) ? NULL : IN_IFEXTRA(ifp)->ii_llt)
 488
 489 extern u_int32_t ipv4_ll_arp_aware;
 490
 491 extern void in_ifaddr_init(void);
 492 extern int imo_multi_filter(const struct ip_moptions *,
 493     const struct ifnet *, const struct sockaddr_in *,
 494     const struct sockaddr_in *);
 495 extern int imo_clone(struct inpcb *, struct inpcb *);
 496 extern void inm_commit(struct in_multi *);
 497 extern void inm_clear_recorded(struct in_multi *);
 498 extern void inm_print(const struct in_multi *);
 499 extern int inm_record_source(struct in_multi *inm, const in_addr_t);
 500 extern void inm_release(struct in_multi *);
 501 extern void in_multi_init(void);
 502 extern struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
 503 extern void in_delmulti(struct in_multi *);
 504 extern int in_leavegroup(struct in_multi *, struct in_mfilter *);
 505 extern int in_multi_detach(struct in_multi *);
 506 extern void inm_addref(struct in_multi *, int);
 507 extern void inm_remref(struct in_multi *, int);
 508 extern void inm_purge(struct in_multi *);
 509 extern uint8_t ims_get_mode(const struct in_multi *,
 510     const struct ip_msource *, uint8_t);
 511 extern int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
 512     struct proc *);
 513 extern int in_inithead(void **, int);
 514 extern void in_rtqdrain(void);
 515 extern struct radix_node *in_validate(struct radix_node *);
 516 extern void ip_input(struct mbuf *);
 517 extern void ip_input_process_list(struct mbuf *);
 518 extern int in_ifadown(struct ifaddr *ifa, int);
 519 extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
 520 extern u_int32_t inaddr_hashval(u_int32_t);
 521 extern void in_purgeaddrs(struct ifnet *);
 522 extern void gre_input(struct mbuf *, int);
 523 extern void imf_leave(struct in_mfilter *);
 524 extern void imf_purge(struct in_mfilter *);
 525 extern int inp_join_group(struct inpcb *, struct sockopt *);
 526 extern int inp_leave_group(struct inpcb *, struct sockopt *);
 527 extern void in_multihead_lock_exclusive(void);
 528 extern void in_multihead_lock_shared(void);
 529 extern void in_multihead_lock_assert(int);
 530 extern void in_multihead_lock_done(void);
 531 #endif /* BSD_KERNEL_PRIVATE */
 532 /* INET6 stuff */
 533 #include <netinet6/in6_var.h>
 534 #endif /* _NETINET_IN_VAR_H_ */