bsd/net/route.h

   1 /*
   2  * Copyright (c) 2000-2017 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) 1980, 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  *      @(#)route.h     8.3 (Berkeley) 4/19/94
  61  * $FreeBSD: src/sys/net/route.h,v 1.36.2.1 2000/08/16 06:14:23 jayanth Exp $
  62  */
  63
  64 #ifndef _NET_ROUTE_H_
  65 #define _NET_ROUTE_H_
  66 #include <sys/appleapiopts.h>
  67 #include <stdint.h>
  68 #include <sys/types.h>
  69 #include <sys/socket.h>
  70
  71 /*
  72  * These numbers are used by reliable protocols for determining
  73  * retransmission behavior and are included in the routing structure.
  74  */
  75 struct rt_metrics {
  76         u_int32_t       rmx_locks;      /* Kernel leaves these values alone */
  77         u_int32_t       rmx_mtu;        /* MTU for this path */
  78         u_int32_t       rmx_hopcount;   /* max hops expected */
  79         int32_t         rmx_expire;     /* lifetime for route, e.g. redirect */
  80         u_int32_t       rmx_recvpipe;   /* inbound delay-bandwidth product */
  81         u_int32_t       rmx_sendpipe;   /* outbound delay-bandwidth product */
  82         u_int32_t       rmx_ssthresh;   /* outbound gateway buffer limit */
  83         u_int32_t       rmx_rtt;        /* estimated round trip time */
  84         u_int32_t       rmx_rttvar;     /* estimated rtt variance */
  85         u_int32_t       rmx_pksent;     /* packets sent using this route */
  86         u_int32_t       rmx_state;      /* route state */
  87         u_int32_t       rmx_filler[3];  /* will be used for T/TCP later */
  88 };
  89
  90 /*
  91  * rmx_rtt and rmx_rttvar are stored as microseconds;
  92  */
  93 #define RTM_RTTUNIT     1000000 /* units for rtt, rttvar, as units per sec */
  94
  95 #ifdef PRIVATE
  96 struct route_old {
  97         void            *ro_rt;
  98         uint32_t        ro_flags;
  99         struct sockaddr ro_dst;
 100 };
 101 #endif /* PRIVATE */
 102
 103 #ifdef BSD_KERNEL_PRIVATE
 104 #include <kern/locks.h>
 105 #include <net/radix.h>
 106 #include <net/if_llatbl.h>
 107 #include <sys/eventhandler.h>
 108 #include <net/if_dl.h>
 109
 110 /*
 111  * Kernel resident routing tables.
 112  *
 113  * The routing tables are initialized when interface addresses
 114  * are set by making entries for all directly connected interfaces.
 115  */
 116
 117 /* forward declarations */
 118 struct ifnet_llreach_info;
 119 struct rt_reach_info;
 120
 121 /*
 122  * IP route structure
 123  *
 124  * A route consists of a destination address and a reference
 125  * to a routing entry.  These are often held by protocols
 126  * in their control blocks, e.g. inpcb.
 127  */
 128 struct route {
 129         /*
 130          * N.B: struct route must begin with ro_{rt, lle, srcia, flags}
 131          * because the code does some casts of a 'struct route_in6 *'
 132          * to a 'struct route *'.
 133          */
 134         struct rtentry  *ro_rt;
 135         struct llentry  *ro_lle;
 136
 137         struct ifaddr   *ro_srcia;
 138         uint32_t        ro_flags;       /* route flags (see below) */
 139         struct sockaddr ro_dst;
 140 };
 141
 142 #define ROF_SRCIF_SELECTED      0x0001  /* source interface was selected */
 143 #if 0
 144 /* XXX These will be used in the changes coming in later */
 145 #define        ROF_NORTREF             0x0002  /* doesn't hold reference on ro_rt */
 146 #define        ROF_L2_ME               0x0004  /* dst L2 addr is our address */
 147 #define        ROF_MAY_LOOP            0x0008  /* dst may require loop copy */
 148 #define        ROF_HAS_HEADER          0x0010  /* mbuf already have its header prepended */
 149 #define        ROF_REJECT              0x0020  /* Destination is reject */
 150 #define        ROF_BLACKHOLE           0x0040  /* Destination is blackhole */
 151 #define        ROF_HAS_GW              0x0080  /* Destination has GW  */
 152 #endif
 153 #define ROF_LLE_CACHE   0x0100  /* Cache link layer  */
 154
 155 #define ROUTE_UNUSABLE(_ro)                                             \
 156         ((_ro)->ro_rt == NULL ||                                        \
 157         ((_ro)->ro_rt->rt_flags & (RTF_UP|RTF_CONDEMNED)) != RTF_UP ||  \
 158         RT_GENID_OUTOFSYNC((_ro)->ro_rt))
 159
 160 #define _ROUTE_RELEASE_COMMON(_ro, _rnh_locked) do {                    \
 161         if ((_ro)->ro_rt != NULL) {                                     \
 162                 RT_LOCK_ASSERT_NOTHELD((_ro)->ro_rt);                   \
 163                 if (_rnh_locked)                                        \
 164                         rtfree_locked((_ro)->ro_rt);                    \
 165                 else                                                    \
 166                         rtfree((_ro)->ro_rt);                           \
 167                 (_ro)->ro_rt = NULL;                                    \
 168         }                                                               \
 169         if ((_ro)->ro_srcia != NULL) {                                  \
 170                 IFA_REMREF((_ro)->ro_srcia);                            \
 171                 (_ro)->ro_srcia = NULL;                                 \
 172                 (_ro)->ro_flags &= ~ROF_SRCIF_SELECTED;                 \
 173         }                                                               \
 174         if ((_ro)->ro_lle != NULL) {                                    \
 175                 LLE_REMREF((_ro)->ro_lle);                              \
 176                 (_ro)->ro_lle = NULL;                                   \
 177                 (_ro)->ro_flags &= ~ROF_LLE_CACHE;                      \
 178         }                                                               \
 179 } while (0)
 180
 181 #define ROUTE_RELEASE_LOCKED(_ro)       _ROUTE_RELEASE_COMMON(_ro, TRUE)
 182 #define ROUTE_RELEASE(_ro)              _ROUTE_RELEASE_COMMON(_ro, FALSE)
 183
 184 /*
 185  * We distinguish between routes to hosts and routes to networks,
 186  * preferring the former if available.  For each route we infer
 187  * the interface to use from the gateway address supplied when
 188  * the route was entered.  Routes that forward packets through
 189  * gateways are marked so that the output routines know to address the
 190  * gateway rather than the ultimate destination.
 191  */
 192
 193 #define NRTT_HIST       10
 194 /*
 195  * Kernel routing entry structure.
 196  */
 197 struct rtentry {
 198         struct  radix_node rt_nodes[2]; /* tree glue, and other values */
 199 #define rt_key(r)       (SA((r)->rt_nodes->rn_key))
 200 #define rt_mask(r)      (SA((r)->rt_nodes->rn_mask))
 201         /*
 202          * See bsd/net/route.c for synchronization notes.
 203          */
 204         decl_lck_mtx_data(, rt_lock);   /* lock for routing entry */
 205         uint32_t rt_refcnt;             /* # held references */
 206         uint32_t rt_flags;              /* up/down?, host/net */
 207         uint32_t rt_genid;              /* route generation id */
 208         struct sockaddr *rt_gateway;    /* value */
 209         struct ifnet *rt_ifp;           /* the answer: interface to use */
 210         struct ifaddr *rt_ifa;          /* the answer: interface addr to use */
 211         struct sockaddr *rt_genmask;    /* for generation of cloned routes */
 212         void *rt_llinfo;                /* pointer to link level info cache */
 213         void (*rt_llinfo_get_ri)        /* llinfo get reachability info fn */
 214             (struct rtentry *, struct rt_reach_info *);
 215         void (*rt_llinfo_get_iflri)     /* ifnet llinfo get reach. info fn */
 216             (struct rtentry *, struct ifnet_llreach_info *);
 217         void (*rt_llinfo_purge)(struct rtentry *); /* llinfo purge fn */
 218         void (*rt_llinfo_free)(void *); /* link level info free function */
 219         void (*rt_llinfo_refresh) (struct rtentry *); /* expedite llinfo refresh */
 220         struct rt_metrics rt_rmx;       /* metrics used by rx'ing protocols */
 221 #define rt_use rt_rmx.rmx_pksent
 222         struct rtentry *rt_gwroute;     /* implied entry for gatewayed routes */
 223         struct rtentry *rt_parent;      /* cloning parent of this route */
 224         struct nstat_counts *rt_stats;  /* route stats */
 225         void (*rt_if_ref_fn)(struct ifnet *, int); /* interface ref func */
 226
 227         uint32_t *rt_tree_genid;        /* ptr to per-tree route_genid */
 228         uint64_t rt_expire;             /* expiration time in uptime seconds */
 229         uint64_t base_calendartime;     /* calendar time upon entry creation */
 230         uint64_t base_uptime;           /* uptime upon entry creation */
 231         u_int32_t rtt_hist[NRTT_HIST];  /* RTT history sample by TCP connections */
 232         u_int32_t rtt_min;              /* minimum RTT computed from history */
 233         u_int32_t rtt_expire_ts;        /* RTT history expire timestamp */
 234         u_int8_t rtt_index;             /* Index into RTT history */
 235         /* Event handler context for the rtentrt */
 236         struct eventhandler_lists_ctxt rt_evhdlr_ctxt;
 237 };
 238
 239 enum {
 240         ROUTE_STATUS_UPDATE = 1,
 241         ROUTE_ENTRY_REFRESH,
 242         ROUTE_ENTRY_DELETED,
 243         ROUTE_LLENTRY_RESOLVED,
 244         ROUTE_LLENTRY_UNREACH,
 245         ROUTE_LLENTRY_CHANGED,
 246         ROUTE_LLENTRY_STALE,
 247         ROUTE_LLENTRY_TIMEDOUT,
 248         ROUTE_LLENTRY_DELETED,
 249         ROUTE_LLENTRY_EXPIRED,
 250         ROUTE_LLENTRY_PROBED,
 251         ROUTE_EVHDLR_DEREGISTER,
 252 };
 253
 254 extern const char * route_event2str(int route_event);
 255
 256 typedef void (*route_event_fn) (struct eventhandler_entry_arg,
 257     struct sockaddr *, int, struct sockaddr *, int);
 258 EVENTHANDLER_DECLARE(route_event, route_event_fn);
 259
 260 /*
 261  * Synchronize route entry's generation ID with the tree's.
 262  */
 263 #define RT_GENID_SYNC(_rt) do {                                         \
 264         if ((_rt)->rt_tree_genid != NULL)                               \
 265                 (_rt)->rt_genid = *(_rt)->rt_tree_genid;                \
 266 } while (0)
 267
 268 /*
 269  * Indicates whether or not the route entry's generation ID is stale.
 270  */
 271 #define RT_GENID_OUTOFSYNC(_rt)                                         \
 272         ((_rt)->rt_tree_genid != NULL &&                                \
 273         *(_rt)->rt_tree_genid != (_rt)->rt_genid)
 274
 275 #endif /* BSD_KERNEL_PRIVATE */
 276
 277 #define RTF_UP          0x1             /* route usable */
 278 #define RTF_GATEWAY     0x2             /* destination is a gateway */
 279 #define RTF_HOST        0x4             /* host entry (net otherwise) */
 280 #define RTF_REJECT      0x8             /* host or net unreachable */
 281 #define RTF_DYNAMIC     0x10            /* created dynamically (by redirect) */
 282 #define RTF_MODIFIED    0x20            /* modified dynamically (by redirect) */
 283 #define RTF_DONE        0x40            /* message confirmed */
 284 #define RTF_DELCLONE    0x80            /* delete cloned route */
 285 #define RTF_CLONING     0x100           /* generate new routes on use */
 286 #define RTF_XRESOLVE    0x200           /* external daemon resolves name */
 287 #define RTF_LLINFO      0x400           /* DEPRECATED - exists ONLY for backward
 288                                            compatibility */
 289 #define RTF_LLDATA      0x400           /* used by apps to add/del L2 entries */
 290 #define RTF_STATIC      0x800           /* manually added */
 291 #define RTF_BLACKHOLE   0x1000          /* just discard pkts (during updates) */
 292 #define RTF_NOIFREF     0x2000          /* not eligible for RTF_IFREF */
 293 #define RTF_PROTO2      0x4000          /* protocol specific routing flag */
 294 #define RTF_PROTO1      0x8000          /* protocol specific routing flag */
 295
 296 #define RTF_PRCLONING   0x10000         /* protocol requires cloning */
 297 #define RTF_WASCLONED   0x20000         /* route generated through cloning */
 298 #define RTF_PROTO3      0x40000         /* protocol specific routing flag */
 299                                         /* 0x80000 unused */
 300 #define RTF_PINNED      0x100000        /* future use */
 301 #define RTF_LOCAL       0x200000        /* route represents a local address */
 302 #define RTF_BROADCAST   0x400000        /* route represents a bcast address */
 303 #define RTF_MULTICAST   0x800000        /* route represents a mcast address */
 304 #define RTF_IFSCOPE     0x1000000       /* has valid interface scope */
 305 #define RTF_CONDEMNED   0x2000000       /* defunct; no longer modifiable */
 306 #define RTF_IFREF       0x4000000       /* route holds a ref to interface */
 307 #define RTF_PROXY       0x8000000       /* proxying, no interface scope */
 308 #define RTF_ROUTER      0x10000000      /* host is a router */
 309 #define RTF_DEAD        0x20000000      /* Route entry is being freed */
 310                                         /* 0x40000000 and up unassigned */
 311
 312 #define RTPRF_OURS      RTF_PROTO3      /* set on routes we manage */
 313 #define RTF_BITS \
 314         "\020\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE" \
 315         "\10DELCLONE\11CLONING\12XRESOLVE\13LLINFO\14STATIC\15BLACKHOLE" \
 316         "\16NOIFREF\17PROTO2\20PROTO1\21PRCLONING\22WASCLONED\23PROTO3" \
 317         "\25PINNED\26LOCAL\27BROADCAST\30MULTICAST\31IFSCOPE\32CONDEMNED" \
 318         "\33IFREF\34PROXY\35ROUTER"
 319
 320 #define IS_DIRECT_HOSTROUTE(rt) \
 321         (((rt)->rt_flags & (RTF_HOST | RTF_GATEWAY)) == RTF_HOST)
 322 /*
 323  * Routing statistics.
 324  */
 325 struct  rtstat {
 326         short   rts_badredirect;        /* bogus redirect calls */
 327         short   rts_dynamic;            /* routes created by redirects */
 328         short   rts_newgateway;         /* routes modified by redirects */
 329         short   rts_unreach;            /* lookups which failed */
 330         short   rts_wildcard;           /* lookups satisfied by a wildcard */
 331         short   rts_badrtgwroute;       /* route to gateway is not direct */
 332 };
 333
 334 /*
 335  * Structures for routing messages.
 336  */
 337 struct rt_msghdr {
 338         u_short rtm_msglen;     /* to skip over non-understood messages */
 339         u_char  rtm_version;    /* future binary compatibility */
 340         u_char  rtm_type;       /* message type */
 341         u_short rtm_index;      /* index for associated ifp */
 342         int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
 343         int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
 344         pid_t   rtm_pid;        /* identify sender */
 345         int     rtm_seq;        /* for sender to identify action */
 346         int     rtm_errno;      /* why failed */
 347         int     rtm_use;        /* from rtentry */
 348         u_int32_t rtm_inits;    /* which metrics we are initializing */
 349         struct rt_metrics rtm_rmx; /* metrics themselves */
 350 };
 351
 352 struct rt_msghdr2 {
 353         u_short rtm_msglen;     /* to skip over non-understood messages */
 354         u_char  rtm_version;    /* future binary compatibility */
 355         u_char  rtm_type;       /* message type */
 356         u_short rtm_index;      /* index for associated ifp */
 357         int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
 358         int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
 359         int32_t rtm_refcnt;     /* reference count */
 360         int     rtm_parentflags; /* flags of the parent route */
 361         int     rtm_reserved;   /* reserved field set to 0 */
 362         int     rtm_use;        /* from rtentry */
 363         u_int32_t rtm_inits;    /* which metrics we are initializing */
 364         struct rt_metrics rtm_rmx; /* metrics themselves */
 365 };
 366
 367 #ifdef PRIVATE
 368 struct kev_netevent_apnfallbk_data {
 369         pid_t           epid;           /* effective PID */
 370         uuid_t          euuid;          /* effective UUID */
 371 };
 372
 373 /*
 374  * Route reachability info.
 375  */
 376 struct rt_reach_info {
 377         u_int32_t       ri_refcnt;      /* reference count */
 378         u_int32_t       ri_probes;      /* total # of probes */
 379         u_int64_t       ri_snd_expire;  /* tx expiration (calendar) time */
 380         u_int64_t       ri_rcv_expire;  /* rx expiration (calendar) time */
 381         int32_t         ri_rssi;        /* received signal strength */
 382         int32_t         ri_lqm;         /* link quality metric */
 383         int32_t         ri_npm;         /* node proximity metric */
 384 };
 385
 386 /*
 387  * Extended routing message header (private).
 388  */
 389 struct rt_msghdr_ext {
 390         u_short rtm_msglen;     /* to skip over non-understood messages */
 391         u_char  rtm_version;    /* future binary compatibility */
 392         u_char  rtm_type;       /* message type */
 393         u_int32_t rtm_index;    /* index for associated ifp */
 394         u_int32_t rtm_flags;    /* flags, incl. kern & message, e.g. DONE */
 395         u_int32_t rtm_reserved; /* for future use */
 396         u_int32_t rtm_addrs;    /* bitmask identifying sockaddrs in msg */
 397         pid_t   rtm_pid;        /* identify sender */
 398         int     rtm_seq;        /* for sender to identify action */
 399         int     rtm_errno;      /* why failed */
 400         u_int32_t rtm_use;      /* from rtentry */
 401         u_int32_t rtm_inits;    /* which metrics we are initializing */
 402         struct rt_metrics rtm_rmx;      /* metrics themselves */
 403         struct rt_reach_info rtm_ri;    /* route reachability info */
 404 };
 405 #endif /* PRIVATE */
 406
 407 #define RTM_VERSION     5       /* Up the ante and ignore older versions */
 408
 409 /*
 410  * Message types.
 411  */
 412 #define RTM_ADD         0x1     /* Add Route */
 413 #define RTM_DELETE      0x2     /* Delete Route */
 414 #define RTM_CHANGE      0x3     /* Change Metrics or flags */
 415 #define RTM_GET         0x4     /* Report Metrics */
 416 #define RTM_LOSING      0x5     /* RTM_LOSING is no longer generated by xnu
 417                                    and is deprecated */
 418 #define RTM_REDIRECT    0x6     /* Told to use different route */
 419 #define RTM_MISS        0x7     /* Lookup failed on this address */
 420 #define RTM_LOCK        0x8     /* fix specified metrics */
 421 #define RTM_OLDADD      0x9     /* caused by SIOCADDRT */
 422 #define RTM_OLDDEL      0xa     /* caused by SIOCDELRT */
 423 #define RTM_RESOLVE     0xb     /* req to resolve dst to LL addr */
 424 #define RTM_NEWADDR     0xc     /* address being added to iface */
 425 #define RTM_DELADDR     0xd     /* address being removed from iface */
 426 #define RTM_IFINFO      0xe     /* iface going up/down etc. */
 427 #define RTM_NEWMADDR    0xf     /* mcast group membership being added to if */
 428 #define RTM_DELMADDR    0x10    /* mcast group membership being deleted */
 429 #ifdef PRIVATE
 430 #define RTM_GET_SILENT  0x11
 431 #endif /* PRIVATE */
 432 #define RTM_IFINFO2     0x12    /* */
 433 #define RTM_NEWMADDR2   0x13    /* */
 434 #define RTM_GET2        0x14    /* */
 435 #ifdef PRIVATE
 436 #define RTM_GET_EXT     0x15
 437 #endif /* PRIVATE */
 438
 439 /*
 440  * Bitmask values for rtm_inits and rmx_locks.
 441  */
 442 #define RTV_MTU         0x1     /* init or lock _mtu */
 443 #define RTV_HOPCOUNT    0x2     /* init or lock _hopcount */
 444 #define RTV_EXPIRE      0x4     /* init or lock _expire */
 445 #define RTV_RPIPE       0x8     /* init or lock _recvpipe */
 446 #define RTV_SPIPE       0x10    /* init or lock _sendpipe */
 447 #define RTV_SSTHRESH    0x20    /* init or lock _ssthresh */
 448 #define RTV_RTT         0x40    /* init or lock _rtt */
 449 #define RTV_RTTVAR      0x80    /* init or lock _rttvar */
 450 #ifdef PRIVATE
 451 #define RTV_REFRESH_HOST        0x100   /* init host route to expedite refresh */
 452 #endif
 453
 454 /*
 455  * Bitmask values for rtm_addrs.
 456  */
 457 #define RTA_DST         0x1     /* destination sockaddr present */
 458 #define RTA_GATEWAY     0x2     /* gateway sockaddr present */
 459 #define RTA_NETMASK     0x4     /* netmask sockaddr present */
 460 #define RTA_GENMASK     0x8     /* cloning mask sockaddr present */
 461 #define RTA_IFP         0x10    /* interface name sockaddr present */
 462 #define RTA_IFA         0x20    /* interface addr sockaddr present */
 463 #define RTA_AUTHOR      0x40    /* sockaddr for author of redirect */
 464 #define RTA_BRD         0x80    /* for NEWADDR, broadcast or p-p dest addr */
 465
 466 /*
 467  * Index offsets for sockaddr array for alternate internal encoding.
 468  */
 469 #define RTAX_DST        0       /* destination sockaddr present */
 470 #define RTAX_GATEWAY    1       /* gateway sockaddr present */
 471 #define RTAX_NETMASK    2       /* netmask sockaddr present */
 472 #define RTAX_GENMASK    3       /* cloning mask sockaddr present */
 473 #define RTAX_IFP        4       /* interface name sockaddr present */
 474 #define RTAX_IFA        5       /* interface addr sockaddr present */
 475 #define RTAX_AUTHOR     6       /* sockaddr for author of redirect */
 476 #define RTAX_BRD        7       /* for NEWADDR, broadcast or p-p dest addr */
 477 #define RTAX_MAX        8       /* size of array to allocate */
 478
 479 struct rt_addrinfo {
 480         int     rti_addrs;
 481         struct  sockaddr *rti_info[RTAX_MAX];
 482 };
 483
 484 #ifdef PRIVATE
 485 /*
 486  * For scoped routing; a zero interface scope value means nil/no scope.
 487  */
 488 #define IFSCOPE_NONE    0
 489 #endif /* PRIVATE */
 490
 491 #ifdef BSD_KERNEL_PRIVATE
 492 /*
 493  * Generic call trace used by some subsystems (e.g. route, ifaddr)
 494  */
 495 #define CTRACE_STACK_SIZE       8               /* depth of stack trace */
 496 #define CTRACE_HIST_SIZE        4               /* refcnt history size */
 497 typedef struct ctrace {
 498         void    *th;                            /* thread ptr */
 499         void    *pc[CTRACE_STACK_SIZE];         /* PC stack trace */
 500 } ctrace_t;
 501
 502 extern void ctrace_record(ctrace_t *);
 503
 504 #define RT_LOCK_ASSERT_HELD(_rt)                                        \
 505         LCK_MTX_ASSERT(&(_rt)->rt_lock, LCK_MTX_ASSERT_OWNED)
 506
 507 #define RT_LOCK_ASSERT_NOTHELD(_rt)                                     \
 508         LCK_MTX_ASSERT(&(_rt)->rt_lock, LCK_MTX_ASSERT_NOTOWNED)
 509
 510 #define RT_LOCK(_rt) do {                                               \
 511         rt_lock(_rt, FALSE);                                            \
 512 } while (0)
 513
 514 #define RT_LOCK_SPIN(_rt) do {                                          \
 515         rt_lock(_rt, TRUE);                                             \
 516 } while (0)
 517
 518 #define RT_CONVERT_LOCK(_rt) do {                                       \
 519         RT_LOCK_ASSERT_HELD(_rt);                                       \
 520         lck_mtx_convert_spin(&(_rt)->rt_lock);                          \
 521 } while (0)
 522
 523 #define RT_UNLOCK(_rt) do {                                             \
 524         rt_unlock(_rt);                                                 \
 525 } while (0)
 526
 527 #define RT_ADDREF_LOCKED(_rt) do {                                      \
 528         rtref(_rt);                                                     \
 529 } while (0)
 530
 531 /*
 532  * Spin variant mutex is used here; caller is responsible for
 533  * converting any previously-held similar lock to full mutex.
 534  */
 535 #define RT_ADDREF(_rt) do {                                             \
 536         RT_LOCK_SPIN(_rt);                                              \
 537         RT_ADDREF_LOCKED(_rt);                                          \
 538         RT_UNLOCK(_rt);                                                 \
 539 } while (0)
 540
 541 #define RT_REMREF_LOCKED(_rt) do {                                      \
 542         (void) rtunref(_rt);                                            \
 543 } while (0)
 544
 545 /*
 546  * Spin variant mutex is used here; caller is responsible for
 547  * converting any previously-held similar lock to full mutex.
 548  */
 549 #define RT_REMREF(_rt) do {                                             \
 550         RT_LOCK_SPIN(_rt);                                              \
 551         RT_REMREF_LOCKED(_rt);                                          \
 552         RT_UNLOCK(_rt);                                                 \
 553 } while (0)
 554
 555 /*
 556  * This macro calculates skew in wall clock, just in case the user changes the
 557  * system time. This skew adjustment is required because we now keep the
 558  * expiration times in uptime terms in the kernel, but the userland still
 559  * expects expiration times in terms of calendar times.  This is used when
 560  * reporting rt_expire, ln_expire, etc. values to user space.
 561  */
 562 #define NET_CALCULATE_CLOCKSKEW(cc, ic, cu, iu)                         \
 563         ((cc.tv_sec - ic) - (cu - iu))
 564
 565 extern unsigned int rt_verbose;
 566 extern struct radix_node_head *rt_tables[AF_MAX+1];
 567 extern lck_mtx_t *rnh_lock;
 568 extern uint32_t route_genid_inet;       /* INET route generation count */
 569 #if INET6
 570 extern uint32_t route_genid_inet6;      /* INET6 route generation count */
 571 #endif /* INET6 */
 572 extern int rttrash;
 573 extern unsigned int rte_debug;
 574
 575 struct ifmultiaddr;
 576 struct proc;
 577
 578 extern void route_init(void);
 579 extern void routegenid_update(void);
 580 extern void routegenid_inet_update(void);
 581 extern void routegenid_inet6_update(void);
 582 extern void rt_ifmsg(struct ifnet *);
 583 extern void rt_missmsg(int, struct rt_addrinfo *, int, int);
 584 extern void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
 585 extern void rt_newmaddrmsg(int, struct ifmultiaddr *);
 586 extern int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
 587 extern void set_primary_ifscope(int, unsigned int);
 588 extern unsigned int get_primary_ifscope(int);
 589 extern boolean_t rt_primary_default(struct rtentry *, struct sockaddr *);
 590 extern struct rtentry *rt_lookup(boolean_t, struct sockaddr *,
 591     struct sockaddr *, struct radix_node_head *, unsigned int);
 592 extern struct rtentry *rt_lookup_coarse(boolean_t, struct sockaddr *,
 593     struct sockaddr *, struct radix_node_head *);
 594 extern void rtalloc(struct route *);
 595 extern void rtalloc_scoped(struct route *, unsigned int);
 596 extern void rtalloc_ign(struct route *, uint32_t);
 597 extern void rtalloc_scoped_ign(struct route *, uint32_t, unsigned int);
 598 extern struct rtentry *rtalloc1(struct sockaddr *, int, uint32_t);
 599 extern struct rtentry *rtalloc1_scoped(struct sockaddr *, int, uint32_t,
 600     unsigned int);
 601 extern struct rtentry *rtalloc1_scoped_locked(struct sockaddr *, int,
 602     uint32_t, unsigned int);
 603 extern void rtfree_locked(struct rtentry *);
 604 extern void rtfree(struct rtentry *);
 605 extern void rtref(struct rtentry *);
 606 /*
 607  * rtunref will decrement the refcount, rtfree will decrement and free if
 608  * the refcount has reached zero and the route is not up.
 609  * Unless you have good reason to do otherwise, use rtfree.
 610  */
 611 extern int rtunref(struct rtentry *);
 612 extern void rtsetifa(struct rtentry *, struct ifaddr *);
 613 extern int rtinit(struct ifaddr *, int, int);
 614 extern int rtinit_locked(struct ifaddr *, int, int);
 615 extern int rtioctl(unsigned long, caddr_t, struct proc *);
 616 extern void rtredirect(struct ifnet *, struct sockaddr *, struct sockaddr *,
 617     struct sockaddr *, int, struct sockaddr *, struct rtentry **);
 618 extern int rtrequest(int, struct sockaddr *,
 619     struct sockaddr *, struct sockaddr *, int, struct rtentry **);
 620 extern int rtrequest_scoped(int, struct sockaddr *, struct sockaddr *,
 621     struct sockaddr *, int, struct rtentry **, unsigned int);
 622 extern int rtrequest_locked(int, struct sockaddr *,
 623     struct sockaddr *, struct sockaddr *, int, struct rtentry **);
 624 extern int rtrequest_scoped_locked(int, struct sockaddr *, struct sockaddr *,
 625     struct sockaddr *, int, struct rtentry **, unsigned int);
 626 extern void sin_set_ifscope(struct sockaddr *, unsigned int);
 627 extern unsigned int sin_get_ifscope(struct sockaddr *);
 628 extern unsigned int sin6_get_ifscope(struct sockaddr *);
 629 extern void rt_lock(struct rtentry *, boolean_t);
 630 extern void rt_unlock(struct rtentry *);
 631 extern struct sockaddr *rtm_scrub(int, int, struct sockaddr *,
 632     struct sockaddr *, void *, uint32_t, kauth_cred_t *);
 633 extern boolean_t rt_validate(struct rtentry *);
 634 extern void rt_set_proxy(struct rtentry *, boolean_t);
 635 extern void rt_set_gwroute(struct rtentry *, struct sockaddr *,
 636     struct rtentry *);
 637 extern void rt_revalidate_gwroute(struct rtentry *, struct rtentry *);
 638 extern errno_t route_to_gwroute(const struct sockaddr *, struct rtentry *,
 639     struct rtentry **);
 640 extern void rt_setexpire(struct rtentry *, uint64_t);
 641 extern void rt_str(struct rtentry *, char *, uint32_t, char *, uint32_t);
 642 extern const char *rtm2str(int);
 643 extern void route_copyin(struct route *, struct route *, size_t);
 644 extern void route_copyout(struct route *, const struct route *, size_t);
 645 extern boolean_t rt_ifa_is_dst(struct sockaddr *, struct ifaddr *);
 646 extern struct sockaddr *sa_copy(struct sockaddr *, struct sockaddr_storage *,
 647     unsigned int *);
 648
 649 /*
 650  * The following is used to enqueue work items for route events
 651  * and also used to pass route event while walking the tree
 652  */
 653 struct route_event {
 654         struct rtentry *rt;
 655         /*
 656          * There's no reference taken on gwrt.
 657          * We only use it to check whether we should
 658          * point to rt_gateway or the embedded rt_addr
 659          * structure.
 660          */
 661         struct rtentry *gwrt;
 662         union {
 663                 union sockaddr_in_4_6 _rtev_ipaddr;
 664                 struct sockaddr_dl _rtev_lladdr;
 665                 char _rtev_addr_bytes[DLIL_SDLMAXLEN];
 666         } rt_addr;
 667         uint32_t route_event_code;
 668         eventhandler_tag evtag;
 669 };
 670
 671 #define rtev_ipaddr     rt_addr._rtev_ipaddr
 672 #define rtev_lladdr     rt_addr._rtev_lladdr
 673 #define rtev_addr_bytes rt_addr._rtev_addr_bytes
 674
 675 extern void route_event_init(struct route_event *p_route_ev, struct rtentry *rt,
 676     struct rtentry *gwrt, int route_ev_code);
 677 extern int route_event_walktree(struct radix_node *rn, void *arg);
 678 extern void route_event_enqueue_nwk_wq_entry(struct rtentry *, struct rtentry *,
 679     uint32_t, eventhandler_tag, boolean_t);
 680
 681 #endif /* BSD_KERNEL_PRIVATE */
 682 #endif /* _NET_ROUTE_H_ */