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 struct kev_in_arpfailure {
 130         struct net_event_data link_data; /* link where ARP is being sent */
 131 };
 132
 133 struct kev_in_arpalive {
 134         struct net_event_data link_data; /* link where ARP was received */
 135 };
 136
 137
 138 #ifdef __APPLE_API_PRIVATE
 139 struct kev_in_portinuse {
 140         u_int16_t port;         /* conflicting port number in host order */
 141         u_int32_t req_pid;      /* PID port requestor */
 142         u_int32_t reserved[2];
 143 };
 144 #endif /* __APPLE_API_PRIVATE */
 145
 146 /*
 147  * Define inet event subclass and specific inet events.
 148  */
 149 #define KEV_INET_SUBCLASS               1 /* inet subclass identifier */
 150
 151 #define KEV_INET_NEW_ADDR               1 /* Userland configured IP address */
 152 #define KEV_INET_CHANGED_ADDR           2 /* Address changed event */
 153 #define KEV_INET_ADDR_DELETED           3 /* IPv6 address was deleted */
 154 #define KEV_INET_SIFDSTADDR             4 /* Dest. address was set */
 155 #define KEV_INET_SIFBRDADDR             5 /* Broadcast address was set */
 156 #define KEV_INET_SIFNETMASK             6 /* Netmask was set */
 157 #define KEV_INET_ARPCOLLISION           7 /* ARP collision detected */
 158 #ifdef __APPLE_API_PRIVATE
 159 #define KEV_INET_PORTINUSE              8 /* use ken_in_portinuse */
 160 #endif
 161 #define KEV_INET_ARPRTRFAILURE          9 /* ARP resolution failed for router */
 162 #define KEV_INET_ARPRTRALIVE            10 /* ARP resolution succeeded for
 163                                               router */
 164
 165 #ifdef BSD_KERNEL_PRIVATE
 166 #include <net/if_var.h>
 167 #include <kern/locks.h>
 168 #include <sys/tree.h>
 169 /*
 170  * Given a pointer to an in_ifaddr (ifaddr),
 171  * return a pointer to the addr as a sockaddr_in.
 172  */
 173 #define IA_SIN(ia)    (&(((struct in_ifaddr *)(ia))->ia_addr))
 174 #define IA_DSTSIN(ia) (&(((struct in_ifaddr *)(ia))->ia_dstaddr))
 175
 176 #define IN_LNAOF(in, ifa) \
 177         ((ntohl((in).s_addr) & ~((struct in_ifaddr *)(ifa)->ia_subnetmask))
 178
 179 /*
 180  * Hash table for IPv4 addresses.
 181  */
 182 extern TAILQ_HEAD(in_ifaddrhead, in_ifaddr) in_ifaddrhead;
 183 extern TAILQ_HEAD(in_ifaddrhashhead, in_ifaddr) *in_ifaddrhashtbl;
 184 extern lck_rw_t *in_ifaddr_rwlock;
 185
 186 #define INADDR_HASH(x)  (&in_ifaddrhashtbl[inaddr_hashval(x)])
 187
 188 extern  u_char  inetctlerrmap[];
 189
 190 /*
 191  * Macro for finding the interface (ifnet structure) corresponding to one
 192  * of our IP addresses.
 193  */
 194 #define INADDR_TO_IFP(addr, ifp)                                        \
 195         /* struct in_addr addr; */                                      \
 196         /* struct ifnet *ifp; */                                        \
 197 {                                                                       \
 198         struct in_ifaddr *ia;                                           \
 199                                                                         \
 200         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 201         TAILQ_FOREACH(ia, INADDR_HASH((addr).s_addr), ia_hash) {        \
 202                 IFA_LOCK_SPIN(&ia->ia_ifa);                             \
 203                 if (IA_SIN(ia)->sin_addr.s_addr == (addr).s_addr) {     \
 204                         IFA_UNLOCK(&ia->ia_ifa);                        \
 205                         break;                                          \
 206                 }                                                       \
 207                 IFA_UNLOCK(&ia->ia_ifa);                                \
 208         }                                                               \
 209         (ifp) = (ia == NULL) ? NULL : ia->ia_ifp;                       \
 210         lck_rw_done(in_ifaddr_rwlock);                                  \
 211 }
 212
 213 /*
 214  * Macro for finding the internet address structure (in_ifaddr) corresponding
 215  * to a given interface (ifnet structure).  Caller is responsible for freeing
 216  * the reference.
 217  */
 218 #define IFP_TO_IA(ifp, ia)                                              \
 219         /* struct ifnet *ifp; */                                        \
 220         /* struct in_ifaddr *ia; */                                     \
 221 {                                                                       \
 222         lck_rw_lock_shared(in_ifaddr_rwlock);                           \
 223         for ((ia) = TAILQ_FIRST(&in_ifaddrhead);                        \
 224             (ia) != NULL && (ia)->ia_ifp != (ifp);                      \
 225             (ia) = TAILQ_NEXT((ia), ia_link))                           \
 226                 continue;                                               \
 227         if ((ia) != NULL)                                               \
 228                 IFA_ADDREF(&(ia)->ia_ifa);                              \
 229         lck_rw_done(in_ifaddr_rwlock);                                  \
 230 }
 231
 232 /*
 233  * This information should be part of the ifnet structure but we don't wish
 234  * to change that - as it might break a number of things
 235  */
 236
 237 /*
 238  * Legacy IPv4 IGMP per-link structure.
 239  */
 240 struct router_info {
 241         struct ifnet *rti_ifp;
 242         int    rti_type; /* type of router which is querier on this interface */
 243         int    rti_time; /* # of slow timeouts since last old query */
 244         SLIST_ENTRY(router_info) rti_list;
 245 };
 246
 247 /*
 248  * IPv4 multicast IGMP-layer source entry.
 249  */
 250 struct ip_msource {
 251         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 252         in_addr_t               ims_haddr;      /* host byte order */
 253         struct ims_st {
 254                 uint16_t        ex;             /* # of exclusive members */
 255                 uint16_t        in;             /* # of inclusive members */
 256         }                       ims_st[2];      /* state at t0, t1 */
 257         uint8_t                 ims_stp;        /* pending query */
 258 };
 259
 260 /*
 261  * IPv4 multicast PCB-layer source entry.
 262  */
 263 struct in_msource {
 264         RB_ENTRY(ip_msource)    ims_link;       /* RB tree links */
 265         in_addr_t               ims_haddr;      /* host byte order */
 266         uint8_t                 imsl_st[2];     /* state before/at commit */
 267 };
 268
 269 RB_HEAD(ip_msource_tree, ip_msource);   /* define struct ip_msource_tree */
 270
 271 RB_PROTOTYPE_SC_PREV(__private_extern__, ip_msource_tree, ip_msource,
 272     ims_link, ip_msource_cmp);
 273
 274 /*
 275  * IPv4 multicast PCB-layer group filter descriptor.
 276  */
 277 struct in_mfilter {
 278         struct ip_msource_tree  imf_sources; /* source list for (S,G) */
 279         u_long                  imf_nsrc;    /* # of source entries */
 280         uint8_t                 imf_st[2];   /* state before/at commit */
 281 };
 282
 283 struct igmp_ifinfo;
 284
 285 /*
 286  * IPv4 group descriptor.
 287  *
 288  * For every entry on an ifnet's if_multiaddrs list which represents
 289  * an IP multicast group, there is one of these structures.
 290  *
 291  * If any source filters are present, then a node will exist in the RB-tree
 292  * to permit fast lookup by source whenever an operation takes place.
 293  * This permits pre-order traversal when we issue reports.
 294  * Source filter trees are kept separately from the socket layer to
 295  * greatly simplify locking.
 296  *
 297  * When IGMPv3 is active, inm_timer is the response to group query timer.
 298  * The state-change timer inm_sctimer is separate; whenever state changes
 299  * for the group the state change record is generated and transmitted,
 300  * and kept if retransmissions are necessary.
 301  *
 302  * The request count here is a count of requests for this address, not a
 303  * count of pointers to this structure.
 304  *
 305  * FUTURE: inm_link is now only used when groups are being purged
 306  * on a detaching ifnet.  It could be demoted to a SLIST_ENTRY.
 307  */
 308 struct in_multi {
 309         decl_lck_mtx_data(, inm_lock);
 310         u_int32_t inm_refcount;         /* reference count */
 311         u_int32_t inm_reqcnt;           /* request count for this address */
 312         u_int32_t inm_debug;            /* see ifa_debug flags */
 313         LIST_ENTRY(in_multi) inm_link;  /* queue macro glue */
 314         struct  in_addr inm_addr;       /* IP multicast address, convenience */
 315         struct  ifnet *inm_ifp;         /* back pointer to ifnet */
 316         struct  ifmultiaddr *inm_ifma;  /* back pointer to ifmultiaddr */
 317         u_int   inm_timer;              /* IGMPv1/v2 group / v3 query timer  */
 318         u_int   inm_state;              /*  state of the membership */
 319         void *inm_rti;                  /* unused, legacy field */
 320
 321         /* New fields for IGMPv3 follow. */
 322         struct igmp_ifinfo      *inm_igi;       /* IGMP info */
 323         SLIST_ENTRY(in_multi)    inm_dtle;      /* detached waiting for rele */
 324         SLIST_ENTRY(in_multi)    inm_nrele;     /* to-be-released by IGMP */
 325         u_int32_t                inm_nrelecnt;  /* deferred release count */
 326         struct ip_msource_tree   inm_srcs;      /* tree of sources */
 327         u_long                   inm_nsrc;      /* # of tree entries */
 328
 329         struct ifqueue           inm_scq;       /* queue of pending
 330                                                  * state-change packets */
 331         struct timeval           inm_lastgsrtv; /* Time of last G-S-R query */
 332         uint16_t                 inm_sctimer;   /* state-change timer */
 333         uint16_t                 inm_scrv;      /* state-change rexmit count */
 334
 335         /*
 336          * SSM state counters which track state at T0 (the time the last
 337          * state-change report's RV timer went to zero) and T1
 338          * (time of pending report, i.e. now).
 339          * Used for computing IGMPv3 state-change reports. Several refcounts
 340          * are maintained here to optimize for common use-cases.
 341          */
 342         struct inm_st {
 343                 uint16_t        iss_fmode;      /* IGMP filter mode */
 344                 uint16_t        iss_asm;        /* # of ASM listeners */
 345                 uint16_t        iss_ex;         /* # of exclusive members */
 346                 uint16_t        iss_in;         /* # of inclusive members */
 347                 uint16_t        iss_rec;        /* # of recorded sources */
 348         }                       inm_st[2];      /* state at t0, t1 */
 349
 350         void (*inm_trace)               /* callback fn for tracing refs */
 351             (struct in_multi *, int);
 352 };
 353
 354 #define INM_LOCK_ASSERT_HELD(_inm)                                      \
 355         lck_mtx_assert(&(_inm)->inm_lock, LCK_MTX_ASSERT_OWNED)
 356
 357 #define INM_LOCK_ASSERT_NOTHELD(_inm)                                   \
 358         lck_mtx_assert(&(_inm)->inm_lock, LCK_MTX_ASSERT_NOTOWNED)
 359
 360 #define INM_LOCK(_inm)                                                  \
 361         lck_mtx_lock(&(_inm)->inm_lock)
 362
 363 #define INM_LOCK_SPIN(_inm)                                             \
 364         lck_mtx_lock_spin(&(_inm)->inm_lock)
 365
 366 #define INM_CONVERT_LOCK(_inm) do {                                     \
 367         INM_LOCK_ASSERT_HELD(_inm);                                     \
 368         lck_mtx_convert_spin(&(_inm)->inm_lock);                        \
 369 } while (0)
 370
 371 #define INM_UNLOCK(_inm)                                                \
 372         lck_mtx_unlock(&(_inm)->inm_lock)
 373
 374 #define INM_ADDREF(_inm)                                                \
 375         inm_addref(_inm, 0)
 376
 377 #define INM_ADDREF_LOCKED(_inm)                                         \
 378         inm_addref(_inm, 1)
 379
 380 #define INM_REMREF(_inm)                                                \
 381         inm_remref(_inm, 0)
 382
 383 #define INM_REMREF_LOCKED(_inm)                                         \
 384         inm_remref(_inm, 1)
 385
 386 #ifdef SYSCTL_DECL
 387 SYSCTL_DECL(_net_inet_ip);
 388 SYSCTL_DECL(_net_inet_raw);
 389 #endif
 390
 391 extern LIST_HEAD(in_multihead, in_multi) in_multihead;
 392
 393 /*
 394  * Structure used by macros below to remember position when stepping through
 395  * all of the in_multi records.
 396  */
 397 struct in_multistep {
 398         struct in_multi *i_inm;
 399 };
 400
 401 /*
 402  * Macro for looking up the in_multi record for a given IP multicast address
 403  * on a given interface.  If no matching record is found, "inm" is set null.
 404  *
 405  * We do this differently compared other BSD implementations; instead of
 406  * walking the if_multiaddrs list at the interface and returning the
 407  * ifma_protospec value of a matching entry, we search the global list
 408  * of in_multi records and find it that way.  Otherwise either the two
 409  * structures (in_multi, ifmultiaddr) need to be ref counted both ways,
 410  * which will make things too complicated, or they need to reside in the
 411  * same protected domain, which they aren't.
 412  *
 413  * Must be called with in_multihead_lock held.
 414  */
 415 #define IN_LOOKUP_MULTI(addr, ifp, inm)                                 \
 416         /* struct in_addr *addr; */                                     \
 417         /* struct ifnet *ifp; */                                        \
 418         /* struct in_multi *inm; */                                     \
 419 do {                                                                    \
 420         struct in_multistep _step;                                      \
 421         IN_FIRST_MULTI(_step, inm);                                     \
 422         while ((inm) != NULL) {                                         \
 423                 INM_LOCK_SPIN(inm);                                     \
 424                 if ((inm)->inm_ifp == (ifp) &&                          \
 425                     (inm)->inm_addr.s_addr == (addr)->s_addr) {         \
 426                         INM_ADDREF_LOCKED(inm);                         \
 427                         INM_UNLOCK(inm);                                \
 428                         break;                                          \
 429                 }                                                       \
 430                 INM_UNLOCK(inm);                                        \
 431                 IN_NEXT_MULTI(_step, inm);                              \
 432         }                                                               \
 433 } while (0)
 434
 435 /*
 436  * Macro to step through all of the in_multi records, one at a time.
 437  * The current position is remembered in "step", which the caller must
 438  * provide.  IN_FIRST_MULTI(), below, must be called to initialize "step"
 439  * and get the first record.  Both macros return a NULL "inm" when there
 440  * are no remaining records.
 441  *
 442  * Must be called with in_multihead_lock held.
 443  */
 444 #define IN_NEXT_MULTI(step, inm)                                        \
 445         /* struct in_multistep  step; */                                \
 446         /* struct in_multi *inm; */                                     \
 447 do {                                                                    \
 448         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 449         if (((inm) = (step).i_inm) != NULL)                             \
 450                 (step).i_inm = LIST_NEXT((step).i_inm, inm_link);       \
 451 } while (0)
 452
 453 #define IN_FIRST_MULTI(step, inm)                                       \
 454         /* struct in_multistep step; */                                 \
 455         /* struct in_multi *inm; */                                     \
 456 do {                                                                    \
 457         in_multihead_lock_assert(LCK_RW_ASSERT_HELD);                   \
 458         (step).i_inm = LIST_FIRST(&in_multihead);                       \
 459         IN_NEXT_MULTI((step), (inm));                                   \
 460 } while (0)
 461
 462 extern lck_mtx_t *inet_domain_mutex;
 463 extern struct domain *inetdomain;
 464
 465 struct ip_moptions;
 466 struct inpcb;
 467
 468 /*
 469  * Return values for imo_multi_filter().
 470  */
 471 #define MCAST_PASS              0       /* Pass */
 472 #define MCAST_NOTGMEMBER        1       /* This host not a member of group */
 473 #define MCAST_NOTSMEMBER        2       /* This host excluded source */
 474 #define MCAST_MUTED             3       /* [deprecated] */
 475
 476 extern u_int32_t ipv4_ll_arp_aware;
 477
 478 extern void in_ifaddr_init(void);
 479 extern int imo_multi_filter(const struct ip_moptions *, const struct ifnet *,
 480     const struct sockaddr *, const struct sockaddr *);
 481 extern int imo_clone(struct inpcb *, struct inpcb *);
 482 extern void inm_commit(struct in_multi *);
 483 extern void inm_clear_recorded(struct in_multi *);
 484 extern void inm_print(const struct in_multi *);
 485 extern int inm_record_source(struct in_multi *inm, const in_addr_t);
 486 extern void inm_release(struct in_multi *);
 487 extern void in_multi_init(void);
 488 extern struct in_multi *in_addmulti(struct in_addr *, struct ifnet *);
 489 extern void in_delmulti(struct in_multi *);
 490 extern int in_leavegroup(struct in_multi *, struct in_mfilter *);
 491 extern int in_multi_detach(struct in_multi *);
 492 extern void inm_addref(struct in_multi *, int);
 493 extern void inm_remref(struct in_multi *, int);
 494 extern void inm_purge(struct in_multi *);
 495 extern uint8_t ims_get_mode(const struct in_multi *,
 496     const struct ip_msource *, uint8_t);
 497 extern int in_control(struct socket *, u_long, caddr_t, struct ifnet *,
 498     struct proc *);
 499 extern int in_inithead(void **, int);
 500 extern void in_rtqdrain(void);
 501 extern struct radix_node *in_validate(struct radix_node *);
 502 extern void ip_input(struct mbuf *);
 503 extern int in_ifadown(struct ifaddr *ifa, int);
 504 extern void in_ifscrub(struct ifnet *, struct in_ifaddr *, int);
 505 extern u_int32_t inaddr_hashval(u_int32_t);
 506 extern void in_purgeaddrs(struct ifnet *);
 507 extern int in_selectaddrs(int af, struct sockaddr_list **,
 508     struct sockaddr_entry **, struct sockaddr_list **,
 509     struct sockaddr_entry **);
 510 extern void gre_input(struct mbuf *, int);
 511 extern void imf_leave(struct in_mfilter *);
 512 extern void imf_purge(struct in_mfilter *);
 513 extern int inp_join_group(struct inpcb *, struct sockopt *);
 514 extern int inp_leave_group(struct inpcb *, struct sockopt *);
 515 extern void in_multihead_lock_exclusive(void);
 516 extern void in_multihead_lock_shared(void);
 517 extern void in_multihead_lock_assert(int);
 518 extern void in_multihead_lock_done(void);
 519 #endif /* BSD_KERNEL_PRIVATE */
 520 /* INET6 stuff */
 521 #include <netinet6/in6_var.h>
 522 #endif /* _NETINET_IN_VAR_H_ */