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 #define rt_use rt_rmx.rmx_pksent
 167
 168 #define RTF_UP          0x1             /* route usable */
 169 #define RTF_GATEWAY     0x2             /* destination is a gateway */
 170 #define RTF_HOST        0x4             /* host entry (net otherwise) */
 171 #define RTF_REJECT      0x8             /* host or net unreachable */
 172 #define RTF_DYNAMIC     0x10            /* created dynamically (by redirect) */
 173 #define RTF_MODIFIED    0x20            /* modified dynamically (by redirect) */
 174 #define RTF_DONE        0x40            /* message confirmed */
 175 /*                      0x80               unused, was RTF_DELCLONE */
 176 #define RTF_CLONING     0x100           /* generate new routes on use */
 177 #define RTF_XRESOLVE    0x200           /* external daemon resolves name */
 178 #define RTF_LLINFO      0x400           /* generated by link layer (e.g. ARP) */
 179 #define RTF_STATIC      0x800           /* manually added */
 180 #define RTF_BLACKHOLE   0x1000          /* just discard pkts (during updates) */
 181 /*                      0x2000             unused */
 182 #define RTF_PROTO2      0x4000          /* protocol specific routing flag */
 183 #define RTF_PROTO1      0x8000          /* protocol specific routing flag */
 184
 185 #define RTF_PRCLONING   0x10000         /* protocol requires cloning */
 186 #define RTF_WASCLONED   0x20000         /* route generated through cloning */
 187 #define RTF_PROTO3      0x40000         /* protocol specific routing flag */
 188 /*                      0x80000            unused */
 189 #define RTF_PINNED      0x100000        /* future use */
 190 #define RTF_LOCAL       0x200000        /* route represents a local address */
 191 #define RTF_BROADCAST   0x400000        /* route represents a bcast address */
 192 #define RTF_MULTICAST   0x800000        /* route represents a mcast address */
 193 #define RTF_MPLSOPS     0x1000000       /* route uses mpls label operations */
 194                                         /* 0x2000000 and up unassigned */
 195
 196 /*
 197  * Routing statistics.
 198  */
 199 struct rtstatistics {
 200         u_long  rts_badredirect;        /* bogus redirect calls */
 201         u_long  rts_dynamic;            /* routes created by redirects */
 202         u_long  rts_newgateway;         /* routes modified by redirects */
 203         u_long  rts_unreach;            /* lookups which failed */
 204         u_long  rts_wildcard;           /* lookups satisfied by a wildcard */
 205         u_long  rts_pad[3];             /* pad to cache line size (64B) */
 206 };
 207 #ifdef _KERNEL
 208 CTASSERT((sizeof(struct rtstatistics) & __VM_CACHELINE_MASK) == 0);
 209 #endif
 210
 211 /*
 212  * Structures for routing messages.
 213  */
 214 struct rt_msghdr {
 215         u_short rtm_msglen;     /* to skip over non-understood messages */
 216         u_char  rtm_version;    /* future binary compatibility */
 217         u_char  rtm_type;       /* message type */
 218         u_short rtm_index;      /* index for associated ifp */
 219         int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
 220         int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
 221         pid_t   rtm_pid;        /* identify sender */
 222         int     rtm_seq;        /* for sender to identify action */
 223         int     rtm_errno;      /* why failed */
 224         int     rtm_use;        /* from rtentry */
 225         u_long  rtm_inits;      /* which metrics we are initializing */
 226         struct  rt_metrics rtm_rmx; /* metrics themselves */
 227 };
 228
 229 #define RTM_VERSION     6       /* Up the ante and ignore older versions */
 230
 231 /*
 232  * Message types.
 233  */
 234 #define RTM_ADD         0x1     /* Add Route */
 235 #define RTM_DELETE      0x2     /* Delete Route */
 236 #define RTM_CHANGE      0x3     /* Change Metrics or flags */
 237 #define RTM_GET         0x4     /* Report Metrics */
 238 #define RTM_LOSING      0x5     /* Kernel Suspects Partitioning */
 239 #define RTM_REDIRECT    0x6     /* Told to use different route */
 240 #define RTM_MISS        0x7     /* Lookup failed on this address */
 241 #define RTM_LOCK        0x8     /* fix specified metrics */
 242 /*                      0x9        unused, was RTM_OLDADD */
 243 /*                      0xa        unused, was RTM_OLDDEL */
 244 #define RTM_RESOLVE     0xb     /* req to resolve dst to LL addr */
 245 #define RTM_NEWADDR     0xc     /* address being added to iface */
 246 #define RTM_DELADDR     0xd     /* address being removed from iface */
 247 #define RTM_IFINFO      0xe     /* iface going up/down etc. */
 248 #define RTM_NEWMADDR    0xf     /* mcast group membership being added to if */
 249 #define RTM_DELMADDR    0x10    /* mcast group membership being deleted */
 250 #define RTM_IFANNOUNCE  0x11    /* iface arrival/departure */
 251 #define RTM_IEEE80211   0x12    /* IEEE80211 wireless event */
 252
 253 /*
 254  * Bitmask values for rtm_inits and rmx_locks.
 255  */
 256 #define RTV_MTU         0x1     /* init or lock _mtu */
 257 #define RTV_HOPCOUNT    0x2     /* init or lock _hopcount */
 258 #define RTV_EXPIRE      0x4     /* init or lock _expire */
 259 #define RTV_RPIPE       0x8     /* init or lock _recvpipe */
 260 #define RTV_SPIPE       0x10    /* init or lock _sendpipe */
 261 #define RTV_SSTHRESH    0x20    /* init or lock _ssthresh */
 262 #define RTV_RTT         0x40    /* init or lock _rtt */
 263 #define RTV_RTTVAR      0x80    /* init or lock _rttvar */
 264 #define RTV_MSL         0x100   /* init or lock _msl */
 265 #define RTV_IWMAXSEGS   0x200   /* init or lock _iwmaxsegs */
 266 #define RTV_IWCAPSEGS   0x400   /* init or lock _iwcapsegs */
 267
 268 /*
 269  * Bitmask values for rtm_addrs.
 270  */
 271 #define RTA_DST         0x1     /* destination sockaddr present */
 272 #define RTA_GATEWAY     0x2     /* gateway sockaddr present */
 273 #define RTA_NETMASK     0x4     /* netmask sockaddr present */
 274 #define RTA_GENMASK     0x8     /* cloning mask sockaddr present */
 275 #define RTA_IFP         0x10    /* interface name sockaddr present */
 276 #define RTA_IFA         0x20    /* interface addr sockaddr present */
 277 #define RTA_AUTHOR      0x40    /* sockaddr for author of redirect */
 278 #define RTA_BRD         0x80    /* for NEWADDR, broadcast or p-p dest addr */
 279 #define RTA_MPLS1       0x100   /* mpls label and/or operation present */
 280 #define RTA_MPLS2       0x200   /* mpls label and/or operation present */
 281 #define RTA_MPLS3       0x400   /* mpls label and/or operation present */
 282
 283 /*
 284  * Index offsets for sockaddr array for alternate internal encoding.
 285  */
 286 #define RTAX_DST        0       /* destination sockaddr present */
 287 #define RTAX_GATEWAY    1       /* gateway sockaddr present */
 288 #define RTAX_NETMASK    2       /* netmask sockaddr present */
 289 #define RTAX_GENMASK    3       /* cloning mask sockaddr present */
 290 #define RTAX_IFP        4       /* interface name sockaddr present */
 291 #define RTAX_IFA        5       /* interface addr sockaddr present */
 292 #define RTAX_AUTHOR     6       /* sockaddr for author of redirect */
 293 #define RTAX_BRD        7       /* for NEWADDR, broadcast or p-p dest addr */
 294 #define RTAX_MPLS1      8       /* mpls label and/or operation present */
 295 #define RTAX_MPLS2      9       /* mpls label and/or operation present */
 296 #define RTAX_MPLS3      10      /* mpls label and/or operation present */
 297 #define RTAX_MAX        11      /* size of array to allocate */
 298
 299 /*
 300  * Sockaddrs passed through the routing socket are padded up to a certain
 301  * size, currently multiples of sizeof(long).  These macros used to be
 302  * replicated in various user and kernel files, but are now made available
 303  * here for convenience and consistency.
 304  *
 305  * FreeBSD uses a similar macro SA_SIZE which could be defined as
 306  * #define SA_SIZE(sa)  RT_ROUNDUP((sa)->sa_len)
 307  */
 308 #define RT_ROUNDUP2(a, n)       ((a) > 0 ? (1 + (((a) - 1) | ((n) - 1))) : (n))
 309 #define RT_ROUNDUP(a)           RT_ROUNDUP2((a), sizeof(long))
 310 #define RT_ADVANCE(x, n)        (x += RT_ROUNDUP((n)->sa_len))
 311
 312 struct rt_addrinfo {
 313         int              rti_addrs;
 314         struct sockaddr *rti_info[RTAX_MAX];
 315         int              rti_flags;
 316         struct ifaddr   *rti_ifa;
 317         struct ifnet    *rti_ifp;
 318 };
 319
 320 #ifdef _KERNEL
 321
 322 #define rti_dst         rti_info[RTAX_DST]
 323 #define rti_gateway     rti_info[RTAX_GATEWAY]
 324 #define rti_netmask     rti_info[RTAX_NETMASK]
 325 #define rti_genmask     rti_info[RTAX_GENMASK]
 326 #define rti_ifpaddr     rti_info[RTAX_IFP]
 327 #define rti_ifaaddr     rti_info[RTAX_IFA]
 328 #define rti_author      rti_info[RTAX_AUTHOR]
 329 #define rti_bcastaddr   rti_info[RTAX_BRD]
 330 #define rti_mpls1       rti_info[RTAX_MPLS1]
 331 #define rti_mpls2       rti_info[RTAX_MPLS2]
 332 #define rti_mpls3       rti_info[RTAX_MPLS3]
 333
 334 extern struct radix_node_head *rt_tables[MAXCPU][AF_MAX+1];
 335
 336 struct ifmultiaddr;
 337 struct proc;
 338 struct ucred;
 339
 340 void     route_init (void);
 341 void     rt_dstmsg(int type, struct sockaddr *dst, int error);
 342 int      rt_getifa (struct rt_addrinfo *);
 343 void     rt_ieee80211msg(struct ifnet *, int, void *, size_t);
 344 void     rt_ifannouncemsg (struct ifnet *, int);
 345 void     rt_ifmsg (struct ifnet *);
 346 int      rt_llroute (struct sockaddr *dst, struct rtentry *rt0,
 347             struct rtentry **drt);
 348 void     rt_missmsg (int, struct rt_addrinfo *, int, int);
 349 void     rt_newaddrmsg (int, struct ifaddr *, int, struct rtentry *);
 350 void     rt_newmaddrmsg (int, struct ifmultiaddr *);
 351 void     rt_rtmsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int error);
 352 int      rt_setgate (struct rtentry *,
 353             struct sockaddr *, struct sockaddr *, boolean_t);
 354 void     rtalloc (struct route *);
 355 void     rtalloc_ign (struct route *, u_long);
 356
 357 struct rtentry *
 358          _rtlookup (struct sockaddr *, __boolean_t, u_long);
 359 #define         RTL_REPORTMSG   TRUE
 360 #define         RTL_DONTREPORT  FALSE
 361
 362 /* flags to ignore */
 363 #define         RTL_DOCLONE     0UL
 364 #define         RTL_DONTCLONE   (RTF_CLONING | RTF_PRCLONING)
 365
 366 /*
 367  * Look up a route with no cloning side-effects or miss reports generated.
 368  */
 369 static __inline struct rtentry *
 370 rtpurelookup(struct sockaddr *dst)
 371 {
 372         return _rtlookup(dst, RTL_DONTREPORT, RTL_DONTCLONE);
 373 }
 374
 375 /*
 376  * Do full route lookup with cloning and reporting on misses.
 377  */
 378 static __inline struct rtentry *
 379 rtlookup(struct sockaddr *dst)
 380 {
 381         return _rtlookup(dst, RTL_REPORTMSG, RTL_DOCLONE);
 382 }
 383
 384 typedef void (*rtrequest1_callback_func_t)(int, int, struct rt_addrinfo *,
 385                                       struct rtentry *, void *);
 386 typedef int (*rtsearch_callback_func_t)(int, struct rt_addrinfo *,
 387                                         struct rtentry *, void *, int);
 388
 389 void     rtfree (struct rtentry *);
 390 void     rtfree_async (struct rtentry *);
 391 int      rtinit (struct ifaddr *, int, int);
 392 int      rtchange (struct ifaddr *, struct ifaddr *);
 393 int      rtioctl (u_long, caddr_t, struct ucred *);
 394 void     rtredirect (struct sockaddr *, struct sockaddr *,
 395             struct sockaddr *, int, struct sockaddr *);
 396 int      rtredirect_oncpu (struct sockaddr *, struct sockaddr *,
 397             struct sockaddr *, int, struct sockaddr *);
 398 int      rtrequest (int, struct sockaddr *,
 399             struct sockaddr *, struct sockaddr *, int, struct rtentry **);
 400 int      rtrequest_global (int, struct sockaddr *,
 401             struct sockaddr *, struct sockaddr *, int);
 402 int      rtrequest1 (int, struct rt_addrinfo *, struct rtentry **);
 403 int      rtrequest1_global (int, struct rt_addrinfo *,
 404             rtrequest1_callback_func_t, void *, boolean_t);
 405
 406 #define RTS_EXACTMATCH          TRUE
 407 #define RTS_NOEXACTMATCH        FALSE
 408
 409 #define RTREQ_PRIO_HIGH         TRUE
 410 #define RTREQ_PRIO_NORM         FALSE
 411
 412 int      rtsearch_global(int, struct rt_addrinfo *,
 413             rtsearch_callback_func_t, void *, boolean_t, boolean_t);
 414
 415 int      rtmask_add_global(struct sockaddr *, boolean_t);
 416
 417 struct sockaddr *_rtmask_lookup(struct sockaddr *, boolean_t);
 418
 419 static __inline struct sockaddr *
 420 rtmask_lookup(struct sockaddr *_mask)
 421 {
 422         return _rtmask_lookup(_mask, FALSE);
 423 }
 424
 425 static __inline struct sockaddr *
 426 rtmask_purelookup(struct sockaddr *_mask)
 427 {
 428         return _rtmask_lookup(_mask, TRUE);
 429 }
 430
 431 void    rt_print(struct rt_addrinfo *, struct rtentry *);
 432 void    rt_addrinfo_print(int cmd, struct rt_addrinfo *);
 433 void    sockaddr_print(struct sockaddr *);
 434
 435 #ifndef _SYS_GLOBALDATA_H_
 436 #include <sys/globaldata.h>
 437 #endif
 438 #ifndef _NET_NETISR2_H_
 439 #include <net/netisr2.h>
 440 #endif
 441
 442 static __inline void
 443 RTFREE(struct rtentry *rt)
 444 {
 445
 446         ASSERT_NETISR_NCPUS(rt->rt_cpuid);
 447         if (rt->rt_refcnt <= 1)
 448                 rtfree(rt);
 449         else
 450                 --rt->rt_refcnt;
 451 }
 452
 453 int     in_inithead(void **, int);
 454
 455 #endif  /* _KERNEL */
 456
 457 #endif  /* !_NET_ROUTE_H_ */