sys/net/route.h

   1 /*
   2  * Copyright (c) 2004, 2005 The DragonFly Project.  All rights reserved.
   3  *
   4  * This code is derived from software contributed to The DragonFly Project
   5  * by Jeffrey M. Hsu.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of The DragonFly Project nor the names of its
  16  *    contributors may be used to endorse or promote products derived
  17  *    from this software without specific, prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  21  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  22  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  23  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  24  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  25  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  26  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  27  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  28  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  29  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 /*
  34  * Copyright (c) 1980, 1986, 1993
  35  *      The Regents of the University of California.  All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  * 1. Redistributions of source code must retain the above copyright
  41  *    notice, this list of conditions and the following disclaimer.
  42  * 2. Redistributions in binary form must reproduce the above copyright
  43  *    notice, this list of conditions and the following disclaimer in the
  44  *    documentation and/or other materials provided with the distribution.
  45  * 3. Neither the name of the University nor the names of its contributors
  46  *    may be used to endorse or promote products derived from this software
  47  *    without specific prior written permission.
  48  *
  49  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  50  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  51  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  52  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  53  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  54  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  55  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  56  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  57  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  58  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  59  * SUCH DAMAGE.
  60  *
  61  *      @(#)route.h     8.4 (Berkeley) 1/9/95
  62  * $FreeBSD: src/sys/net/route.h,v 1.36.2.5 2002/02/01 11:48:01 ru Exp $
  63  * $DragonFly: src/sys/net/route.h,v 1.24 2008/09/11 11:23:29 sephe Exp $
  64  */
  65
  66 #ifndef _NET_ROUTE_H_
  67 #define _NET_ROUTE_H_
  68
  69 #ifndef _SYS_TYPES_H_
  70 #include <sys/types.h>
  71 #endif
  72 #ifndef _SYS_PARAM_H_
  73 #include <sys/param.h>
  74 #endif
  75 #ifndef _SYS_SOCKET_H_
  76 #include <sys/socket.h>
  77 #endif
  78
  79 /*
  80  * Kernel resident routing tables.
  81  *
  82  * The routing tables are initialized when interface addresses
  83  * are set by making entries for all directly connected interfaces.
  84  */
  85
  86 /*
  87  * A route consists of a destination address and a reference
  88  * to a routing entry.  These are often held by protocols
  89  * in their control blocks, e.g. inpcb.
  90  */
  91 struct route {
  92         struct  rtentry *ro_rt;
  93         struct  sockaddr ro_dst;
  94 };
  95
  96 /*
  97  * These numbers are used by reliable protocols for determining
  98  * retransmission behavior and are included in the routing structure.
  99  */
 100 struct rt_metrics {     /* grouped for locality of reference */
 101         u_long  rmx_locks;      /* Kernel must leave these values alone */
 102         u_long  rmx_mtu;        /* MTU for this path */
 103         u_long  rmx_pksent;     /* packets sent using this route */
 104         u_long  rmx_expire;     /* lifetime for route */
 105
 106         u_long  rmx_sendpipe;   /* outbound delay-bandwidth product */
 107         u_long  rmx_ssthresh;   /* outbound gateway buffer limit */
 108         u_long  rmx_rtt;        /* estimated round trip time */
 109         u_long  rmx_rttvar;     /* estimated rtt variance */
 110
 111         u_long  rmx_recvpipe;   /* inbound delay-bandwidth product */
 112         u_long  rmx_hopcount;   /* max hops expected */
 113         u_short rmx_mssopt;     /* peer's cached MSS */
 114         u_short rmx_pad;        /* explicit pad */
 115         u_long  rmx_msl;        /* maximum segment lifetime, unit: ms */
 116         u_long  rmx_iwmaxsegs;  /* IW segments max */
 117         u_long  rmx_iwcapsegs;  /* IW segments */
 118 };
 119
 120 /*
 121  * rmx_rtt and rmx_rttvar are stored as microseconds;
 122  * RTTTOPRHZ(rtt) converts to a value suitable for use
 123  * by a protocol slowtimo counter.
 124  */
 125 #define RTM_RTTUNIT     1000000 /* units for rtt, rttvar, as units per sec */
 126 #define RTTTOPRHZ(r)    ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
 127
 128 /*
 129  * XXX kernel function pointer `rt_output' is visible to applications.
 130  */
 131 struct mbuf;
 132
 133 /*
 134  * We distinguish between routes to hosts and routes to networks,
 135  * preferring the former if available.  For each route we infer
 136  * the interface to use from the gateway address supplied when
 137  * the route was entered.  Routes that forward packets through
 138  * gateways are marked so that the output routines know to address the
 139  * gateway rather than the ultimate destination.
 140  */
 141 #ifndef RNF_NORMAL
 142 #include <net/radix.h>
 143 #endif
 144
 145 struct rtentry {
 146         struct  radix_node rt_nodes[2]; /* tree glue, and other values */
 147 #define rt_key(r)       ((struct sockaddr *)((r)->rt_nodes->rn_key))
 148 #define rt_mask(r)      ((struct sockaddr *)((r)->rt_nodes->rn_mask))
 149         struct  sockaddr *rt_gateway;   /* value */
 150         long    rt_refcnt;              /* # held references */
 151         u_long  rt_flags;               /* up/down?, host/net */
 152         struct  ifnet *rt_ifp;          /* the answer: interface to use */
 153         struct  ifaddr *rt_ifa;         /* the answer: interface to use */
 154         struct  sockaddr *rt_genmask;   /* for generation of cloned routes */
 155         void    *rt_llinfo;             /* pointer to link level info cache */
 156         struct  rt_metrics rt_rmx;      /* metrics used by rx'ing protocols */
 157         struct  rtentry *rt_gwroute;    /* implied entry for gatewayed routes */
 158         int     (*rt_output) (struct ifnet *, struct mbuf *, struct sockaddr *,
 159                               struct rtentry *);
 160                                         /* output routine for this (rt,if) */
 161         struct  rtentry *rt_parent;     /* cloning parent of this route */
 162         int     rt_cpuid;               /* owner cpu */
 163         struct  sockaddr *rt_shim[3];   /* mpls label / operation array */
 164 };
 165
 166 /*
 167  * Following structure necessary for 4.3 compatibility;
 168  * We should eventually move it to a compat file.
 169  */
 170 struct ortentry {
 171         u_long  rt_hash;                /* to speed lookups */
 172         struct  sockaddr rt_dst;        /* key */
 173         struct  sockaddr rt_gateway;    /* value */
 174         short   rt_flags;               /* up/down?, host/net */
 175         short   rt_refcnt;              /* # held references */
 176         u_long  rt_use;                 /* raw # packets forwarded */
 177         struct  ifnet *rt_ifp;          /* the answer: interface to use */
 178 };
 179
 180 #define rt_use rt_rmx.rmx_pksent
 181
 182 #define RTF_UP          0x1             /* route usable */
 183 #define RTF_GATEWAY     0x2             /* destination is a gateway */
 184 #define RTF_HOST        0x4             /* host entry (net otherwise) */
 185 #define RTF_REJECT      0x8             /* host or net unreachable */
 186 #define RTF_DYNAMIC     0x10            /* created dynamically (by redirect) */
 187 #define RTF_MODIFIED    0x20            /* modified dynamically (by redirect) */
 188 #define RTF_DONE        0x40            /* message confirmed */
 189 /*                      0x80               unused, was RTF_DELCLONE */
 190 #define RTF_CLONING     0x100           /* generate new routes on use */
 191 #define RTF_XRESOLVE    0x200           /* external daemon resolves name */
 192 #define RTF_LLINFO      0x400           /* generated by link layer (e.g. ARP) */
 193 #define RTF_STATIC      0x800           /* manually added */
 194 #define RTF_BLACKHOLE   0x1000          /* just discard pkts (during updates) */
 195 #define RTF_PROTO2      0x4000          /* protocol specific routing flag */
 196 #define RTF_PROTO1      0x8000          /* protocol specific routing flag */
 197
 198 #define RTF_PRCLONING   0x10000         /* protocol requires cloning */
 199 #define RTF_WASCLONED   0x20000         /* route generated through cloning */
 200 #define RTF_PROTO3      0x40000         /* protocol specific routing flag */
 201 /*                      0x80000            unused */
 202 #define RTF_PINNED      0x100000        /* future use */
 203 #define RTF_LOCAL       0x200000        /* route represents a local address */
 204 #define RTF_BROADCAST   0x400000        /* route represents a bcast address */
 205 #define RTF_MULTICAST   0x800000        /* route represents a mcast address */
 206 #define RTF_MPLSOPS     0x1000000       /* route uses mpls label operations */
 207                                         /* 0x2000000 and up unassigned */
 208
 209 /*
 210  * Routing statistics.
 211  */
 212 struct  rtstatistics {
 213         u_long  rts_badredirect;        /* bogus redirect calls */
 214         u_long  rts_dynamic;            /* routes created by redirects */
 215         u_long  rts_newgateway;         /* routes modified by redirects */
 216         u_long  rts_unreach;            /* lookups which failed */
 217         u_long  rts_wildcard;           /* lookups satisfied by a wildcard */
 218 };
 219 /*
 220  * Structures for routing messages.
 221  */
 222 struct rt_msghdr {
 223         u_short rtm_msglen;     /* to skip over non-understood messages */
 224         u_char  rtm_version;    /* future binary compatibility */
 225         u_char  rtm_type;       /* message type */
 226         u_short rtm_index;      /* index for associated ifp */
 227         int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
 228         int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
 229         pid_t   rtm_pid;        /* identify sender */
 230         int     rtm_seq;        /* for sender to identify action */
 231         int     rtm_errno;      /* why failed */
 232         int     rtm_use;        /* from rtentry */
 233         u_long  rtm_inits;      /* which metrics we are initializing */
 234         struct  rt_metrics rtm_rmx; /* metrics themselves */
 235 };
 236
 237 #define RTM_VERSION     6       /* Up the ante and ignore older versions */
 238
 239 /*
 240  * Message types.
 241  */
 242 #define RTM_ADD         0x1     /* Add Route */
 243 #define RTM_DELETE      0x2     /* Delete Route */
 244 #define RTM_CHANGE      0x3     /* Change Metrics or flags */
 245 #define RTM_GET         0x4     /* Report Metrics */
 246 #define RTM_LOSING      0x5     /* Kernel Suspects Partitioning */
 247 #define RTM_REDIRECT    0x6     /* Told to use different route */
 248 #define RTM_MISS        0x7     /* Lookup failed on this address */
 249 #define RTM_LOCK        0x8     /* fix specified metrics */
 250 #define RTM_OLDADD      0x9     /* caused by SIOCADDRT */
 251 #define RTM_OLDDEL      0xa     /* caused by SIOCDELRT */
 252 #define RTM_RESOLVE     0xb     /* req to resolve dst to LL addr */
 253 #define RTM_NEWADDR     0xc     /* address being added to iface */
 254 #define RTM_DELADDR     0xd     /* address being removed from iface */
 255 #define RTM_IFINFO      0xe     /* iface going up/down etc. */
 256 #define RTM_NEWMADDR    0xf     /* mcast group membership being added to if */
 257 #define RTM_DELMADDR    0x10    /* mcast group membership being deleted */
 258 #define RTM_IFANNOUNCE  0x11    /* iface arrival/departure */
 259 #define RTM_IEEE80211   0x12    /* IEEE80211 wireless event */
 260
 261 /*
 262  * Bitmask values for rtm_inits and rmx_locks.
 263  */
 264 #define RTV_MTU         0x1     /* init or lock _mtu */
 265 #define RTV_HOPCOUNT    0x2     /* init or lock _hopcount */
 266 #define RTV_EXPIRE      0x4     /* init or lock _expire */
 267 #define RTV_RPIPE       0x8     /* init or lock _recvpipe */
 268 #define RTV_SPIPE       0x10    /* init or lock _sendpipe */
 269 #define RTV_SSTHRESH    0x20    /* init or lock _ssthresh */
 270 #define RTV_RTT         0x40    /* init or lock _rtt */
 271 #define RTV_RTTVAR      0x80    /* init or lock _rttvar */
 272 #define RTV_MSL         0x100   /* init or lock _msl */
 273 #define RTV_IWMAXSEGS   0x200   /* init or lock _iwmaxsegs */
 274 #define RTV_IWCAPSEGS   0x400   /* init or lock _iwcapsegs */
 275
 276 /*
 277  * Bitmask values for rtm_addrs.
 278  */
 279 #define RTA_DST         0x1     /* destination sockaddr present */
 280 #define RTA_GATEWAY     0x2     /* gateway sockaddr present */
 281 #define RTA_NETMASK     0x4     /* netmask sockaddr present */
 282 #define RTA_GENMASK     0x8     /* cloning mask sockaddr present */
 283 #define RTA_IFP         0x10    /* interface name sockaddr present */
 284 #define RTA_IFA         0x20    /* interface addr sockaddr present */
 285 #define RTA_AUTHOR      0x40    /* sockaddr for author of redirect */
 286 #define RTA_BRD         0x80    /* for NEWADDR, broadcast or p-p dest addr */
 287 #define RTA_MPLS1       0x100   /* mpls label and/or operation present */
 288 #define RTA_MPLS2       0x200   /* mpls label and/or operation present */
 289 #define RTA_MPLS3       0x400   /* mpls label and/or operation present */
 290
 291 /*
 292  * Index offsets for sockaddr array for alternate internal encoding.
 293  */
 294 #define RTAX_DST        0       /* destination sockaddr present */
 295 #define RTAX_GATEWAY    1       /* gateway sockaddr present */
 296 #define RTAX_NETMASK    2       /* netmask sockaddr present */
 297 #define RTAX_GENMASK    3       /* cloning mask sockaddr present */
 298 #define RTAX_IFP        4       /* interface name sockaddr present */
 299 #define RTAX_IFA        5       /* interface addr sockaddr present */
 300 #define RTAX_AUTHOR     6       /* sockaddr for author of redirect */
 301 #define RTAX_BRD        7       /* for NEWADDR, broadcast or p-p dest addr */
 302 #define RTAX_MPLS1      8       /* mpls label and/or operation present */
 303 #define RTAX_MPLS2      9       /* mpls label and/or operation present */
 304 #define RTAX_MPLS3      10      /* mpls label and/or operation present */
 305 #define RTAX_MAX        11      /* size of array to allocate */
 306
 307 /*
 308  * Sockaddrs passed through the routing socket are padded up to a certain
 309  * size, currently multiples of sizeof(long).  These macros used to be
 310  * replicated in various user and kernel files, but are now made available
 311  * here for convenience and consistency.
 312  *
 313  * FreeBSD uses a similar macro SA_SIZE which could be defined as
 314  * #define SA_SIZE(sa)  RT_ROUNDUP((sa)->sa_len)
 315  */
 316 #define RT_ROUNDUP2(a, n)       ((a) > 0 ? (1 + (((a) - 1) | ((n) - 1))) : (n))
 317 #define RT_ROUNDUP(a)           RT_ROUNDUP2((a), sizeof(long))
 318 #define RT_ADVANCE(x, n)        (x += RT_ROUNDUP((n)->sa_len))
 319
 320 struct rt_addrinfo {
 321         int              rti_addrs;
 322         struct sockaddr *rti_info[RTAX_MAX];
 323         int              rti_flags;
 324         struct ifaddr   *rti_ifa;
 325         struct ifnet    *rti_ifp;
 326 };
 327
 328 #ifdef _KERNEL
 329
 330 #define rti_dst         rti_info[RTAX_DST]
 331 #define rti_gateway     rti_info[RTAX_GATEWAY]
 332 #define rti_netmask     rti_info[RTAX_NETMASK]
 333 #define rti_genmask     rti_info[RTAX_GENMASK]
 334 #define rti_ifpaddr     rti_info[RTAX_IFP]
 335 #define rti_ifaaddr     rti_info[RTAX_IFA]
 336 #define rti_author      rti_info[RTAX_AUTHOR]
 337 #define rti_bcastaddr   rti_info[RTAX_BRD]
 338 #define rti_mpls1       rti_info[RTAX_MPLS1]
 339 #define rti_mpls2       rti_info[RTAX_MPLS2]
 340 #define rti_mpls3       rti_info[RTAX_MPLS3]
 341
 342 extern struct radix_node_head *rt_tables[MAXCPU][AF_MAX+1];
 343
 344 struct ifmultiaddr;
 345 struct proc;
 346 struct ucred;
 347
 348 void     route_init (void);
 349 void     rt_dstmsg(int type, struct sockaddr *dst, int error);
 350 int      rt_getifa (struct rt_addrinfo *);
 351 void     rt_ieee80211msg(struct ifnet *, int, void *, size_t);
 352 void     rt_ifannouncemsg (struct ifnet *, int);
 353 void     rt_ifmsg (struct ifnet *);
 354 int      rt_llroute (struct sockaddr *dst, struct rtentry *rt0,
 355             struct rtentry **drt);
 356 void     rt_missmsg (int, struct rt_addrinfo *, int, int);
 357 void     rt_newaddrmsg (int, struct ifaddr *, int, struct rtentry *);
 358 void     rt_newmaddrmsg (int, struct ifmultiaddr *);
 359 void     rt_rtmsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int error);
 360 int      rt_setgate (struct rtentry *,
 361             struct sockaddr *, struct sockaddr *, boolean_t);
 362 void     rtalloc (struct route *);
 363 void     rtalloc_ign (struct route *, u_long);
 364
 365 struct rtentry *
 366          _rtlookup (struct sockaddr *, __boolean_t, u_long);
 367 #define         RTL_REPORTMSG   TRUE
 368 #define         RTL_DONTREPORT  FALSE
 369
 370 /* flags to ignore */
 371 #define         RTL_DOCLONE     0UL
 372 #define         RTL_DONTCLONE   (RTF_CLONING | RTF_PRCLONING)
 373
 374 /*
 375  * Look up a route with no cloning side-effects or miss reports generated.
 376  */
 377 static __inline struct rtentry *
 378 rtpurelookup(struct sockaddr *dst)
 379 {
 380         return _rtlookup(dst, RTL_DONTREPORT, RTL_DONTCLONE);
 381 }
 382
 383 /*
 384  * Do full route lookup with cloning and reporting on misses.
 385  */
 386 static __inline struct rtentry *
 387 rtlookup(struct sockaddr *dst)
 388 {
 389         return _rtlookup(dst, RTL_REPORTMSG, RTL_DOCLONE);
 390 }
 391
 392 typedef void (*rtrequest1_callback_func_t)(int, int, struct rt_addrinfo *,
 393                                       struct rtentry *, void *);
 394 typedef int (*rtsearch_callback_func_t)(int, struct rt_addrinfo *,
 395                                         struct rtentry *, void *, int);
 396
 397 void     rtfree (struct rtentry *);
 398 int      rtinit (struct ifaddr *, int, int);
 399 int      rtchange (struct ifaddr *, struct ifaddr *);
 400 int      rtioctl (u_long, caddr_t, struct ucred *);
 401 void     rtredirect (struct sockaddr *, struct sockaddr *,
 402             struct sockaddr *, int, struct sockaddr *);
 403 int      rtredirect_oncpu (struct sockaddr *, struct sockaddr *,
 404             struct sockaddr *, int, struct sockaddr *);
 405 int      rtrequest (int, struct sockaddr *,
 406             struct sockaddr *, struct sockaddr *, int, struct rtentry **);
 407 int      rtrequest_global (int, struct sockaddr *,
 408             struct sockaddr *, struct sockaddr *, int);
 409 int      rtrequest1 (int, struct rt_addrinfo *, struct rtentry **);
 410 int      rtrequest1_global (int, struct rt_addrinfo *,
 411             rtrequest1_callback_func_t, void *, boolean_t);
 412
 413 #define RTS_EXACTMATCH          TRUE
 414 #define RTS_NOEXACTMATCH        FALSE
 415
 416 #define RTREQ_PRIO_HIGH         TRUE
 417 #define RTREQ_PRIO_NORM         FALSE
 418
 419 int      rtsearch_global(int, struct rt_addrinfo *,
 420             rtsearch_callback_func_t, void *, boolean_t, boolean_t);
 421
 422 int      rtmask_add_global(struct sockaddr *, boolean_t);
 423
 424 struct sockaddr *_rtmask_lookup(struct sockaddr *, boolean_t);
 425
 426 static __inline struct sockaddr *
 427 rtmask_lookup(struct sockaddr *_mask)
 428 {
 429         return _rtmask_lookup(_mask, FALSE);
 430 }
 431
 432 static __inline struct sockaddr *
 433 rtmask_purelookup(struct sockaddr *_mask)
 434 {
 435         return _rtmask_lookup(_mask, TRUE);
 436 }
 437
 438 void    rtfree_oncpu(struct rtentry *);
 439 void    rtfree_remote(struct rtentry *);
 440 void    rt_print(struct rt_addrinfo *, struct rtentry *);
 441 void    rt_addrinfo_print(int cmd, struct rt_addrinfo *);
 442 void    sockaddr_print(struct sockaddr *);
 443
 444 struct netmsg_base;
 445 int     rt_domsg_global(struct netmsg_base *);
 446
 447 #ifndef _SYS_GLOBALDATA_H_
 448 #include <sys/globaldata.h>
 449 #endif
 450
 451 static __inline void
 452 RTFREE(struct rtentry *rt)
 453 {
 454         if (rt->rt_cpuid == mycpuid) {
 455                 if (rt->rt_refcnt <= 1)
 456                         rtfree_oncpu(rt);
 457                 else
 458                         --rt->rt_refcnt;
 459         } else {
 460                 rtfree_remote(rt);
 461         }
 462 }
 463
 464 int     in_inithead(void **, int);
 465 #endif
 466
 467 #endif