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. All advertising materials mentioning features or use of this software
  46  *    must display the following acknowledgement:
  47  *      This product includes software developed by the University of
  48  *      California, Berkeley and its contributors.
  49  * 4. Neither the name of the University nor the names of its contributors
  50  *    may be used to endorse or promote products derived from this software
  51  *    without specific prior written permission.
  52  *
  53  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  54  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  55  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  56  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  57  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  58  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  59  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  60  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  61  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  62  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  63  * SUCH DAMAGE.
  64  *
  65  *      @(#)route.h     8.4 (Berkeley) 1/9/95
  66  * $FreeBSD: src/sys/net/route.h,v 1.36.2.5 2002/02/01 11:48:01 ru Exp $
  67  * $DragonFly: src/sys/net/route.h,v 1.21 2007/03/04 18:51:59 swildner Exp $
  68  */
  69
  70 #ifndef _NET_ROUTE_H_
  71 #define _NET_ROUTE_H_
  72
  73 #ifndef _SYS_TYPES_H_
  74 #include <sys/types.h>
  75 #endif
  76 #ifndef _SYS_PARAM_H_
  77 #include <sys/param.h>
  78 #endif
  79 #ifndef _SYS_SOCKET_H_
  80 #include <sys/socket.h>
  81 #endif
  82
  83
  84 /*
  85  * Kernel resident routing tables.
  86  *
  87  * The routing tables are initialized when interface addresses
  88  * are set by making entries for all directly connected interfaces.
  89  */
  90
  91 /*
  92  * A route consists of a destination address and a reference
  93  * to a routing entry.  These are often held by protocols
  94  * in their control blocks, e.g. inpcb.
  95  */
  96 struct route {
  97         struct  rtentry *ro_rt;
  98         struct  sockaddr ro_dst;
  99 };
 100
 101 /*
 102  * These numbers are used by reliable protocols for determining
 103  * retransmission behavior and are included in the routing structure.
 104  */
 105 struct rt_metrics {     /* grouped for locality of reference */
 106         u_long  rmx_locks;      /* Kernel must leave these values alone */
 107         u_long  rmx_mtu;        /* MTU for this path */
 108         u_long  rmx_pksent;     /* packets sent using this route */
 109         u_long  rmx_expire;     /* lifetime for route */
 110
 111         u_long  rmx_sendpipe;   /* outbound delay-bandwidth product */
 112         u_long  rmx_ssthresh;   /* outbound gateway buffer limit */
 113         u_long  rmx_rtt;        /* estimated round trip time */
 114         u_long  rmx_rttvar;     /* estimated rtt variance */
 115
 116         u_long  rmx_recvpipe;   /* inbound delay-bandwidth product */
 117         u_long  rmx_hopcount;   /* max hops expected */
 118         u_long  rmx_filler[4];  /* will be used for T/TCP later */
 119 };
 120
 121 /*
 122  * rmx_rtt and rmx_rttvar are stored as microseconds;
 123  * RTTTOPRHZ(rtt) converts to a value suitable for use
 124  * by a protocol slowtimo counter.
 125  */
 126 #define RTM_RTTUNIT     1000000 /* units for rtt, rttvar, as units per sec */
 127 #define RTTTOPRHZ(r)    ((r) / (RTM_RTTUNIT / PR_SLOWHZ))
 128
 129 /*
 130  * XXX kernel function pointer `rt_output' is visible to applications.
 131  */
 132 struct mbuf;
 133
 134 /*
 135  * We distinguish between routes to hosts and routes to networks,
 136  * preferring the former if available.  For each route we infer
 137  * the interface to use from the gateway address supplied when
 138  * the route was entered.  Routes that forward packets through
 139  * gateways are marked so that the output routines know to address the
 140  * gateway rather than the ultimate destination.
 141  */
 142 #ifndef RNF_NORMAL
 143 #include <net/radix.h>
 144 #endif
 145
 146 struct rtentry {
 147         struct  radix_node rt_nodes[2]; /* tree glue, and other values */
 148 #define rt_key(r)       ((struct sockaddr *)((r)->rt_nodes->rn_key))
 149 #define rt_mask(r)      ((struct sockaddr *)((r)->rt_nodes->rn_mask))
 150         struct  sockaddr *rt_gateway;   /* value */
 151         long    rt_refcnt;              /* # held references */
 152         u_long  rt_flags;               /* up/down?, host/net */
 153         struct  ifnet *rt_ifp;          /* the answer: interface to use */
 154         struct  ifaddr *rt_ifa;         /* the answer: interface to use */
 155         struct  sockaddr *rt_genmask;   /* for generation of cloned routes */
 156         void    *rt_llinfo;             /* pointer to link level info cache */
 157         struct  rt_metrics rt_rmx;      /* metrics used by rx'ing protocols */
 158         struct  rtentry *rt_gwroute;    /* implied entry for gatewayed routes */
 159         int     (*rt_output) (struct ifnet *, struct mbuf *, struct sockaddr *,
 160                               struct rtentry *);
 161                                         /* output routine for this (rt,if) */
 162         struct  rtentry *rt_parent;     /* cloning parent of this route */
 163         void    *rt_filler2;            /* more filler */
 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                                         /* 0x1000000 and up unassigned */
 207
 208 /*
 209  * Routing statistics.
 210  */
 211 struct  rtstatistics {
 212         u_long  rts_badredirect;        /* bogus redirect calls */
 213         u_long  rts_dynamic;            /* routes created by redirects */
 214         u_long  rts_newgateway;         /* routes modified by redirects */
 215         u_long  rts_unreach;            /* lookups which failed */
 216         u_long  rts_wildcard;           /* lookups satisfied by a wildcard */
 217 };
 218 /*
 219  * Structures for routing messages.
 220  */
 221 struct rt_msghdr {
 222         u_short rtm_msglen;     /* to skip over non-understood messages */
 223         u_char  rtm_version;    /* future binary compatibility */
 224         u_char  rtm_type;       /* message type */
 225         u_short rtm_index;      /* index for associated ifp */
 226         int     rtm_flags;      /* flags, incl. kern & message, e.g. DONE */
 227         int     rtm_addrs;      /* bitmask identifying sockaddrs in msg */
 228         pid_t   rtm_pid;        /* identify sender */
 229         int     rtm_seq;        /* for sender to identify action */
 230         int     rtm_errno;      /* why failed */
 231         int     rtm_use;        /* from rtentry */
 232         u_long  rtm_inits;      /* which metrics we are initializing */
 233         struct  rt_metrics rtm_rmx; /* metrics themselves */
 234 };
 235
 236 #define RTM_VERSION     5       /* Up the ante and ignore older versions */
 237
 238 /*
 239  * Message types.
 240  */
 241 #define RTM_ADD         0x1     /* Add Route */
 242 #define RTM_DELETE      0x2     /* Delete Route */
 243 #define RTM_CHANGE      0x3     /* Change Metrics or flags */
 244 #define RTM_GET         0x4     /* Report Metrics */
 245 #define RTM_LOSING      0x5     /* Kernel Suspects Partitioning */
 246 #define RTM_REDIRECT    0x6     /* Told to use different route */
 247 #define RTM_MISS        0x7     /* Lookup failed on this address */
 248 #define RTM_LOCK        0x8     /* fix specified metrics */
 249 #define RTM_OLDADD      0x9     /* caused by SIOCADDRT */
 250 #define RTM_OLDDEL      0xa     /* caused by SIOCDELRT */
 251 #define RTM_RESOLVE     0xb     /* req to resolve dst to LL addr */
 252 #define RTM_NEWADDR     0xc     /* address being added to iface */
 253 #define RTM_DELADDR     0xd     /* address being removed from iface */
 254 #define RTM_IFINFO      0xe     /* iface going up/down etc. */
 255 #define RTM_NEWMADDR    0xf     /* mcast group membership being added to if */
 256 #define RTM_DELMADDR    0x10    /* mcast group membership being deleted */
 257 #define RTM_IFANNOUNCE  0x11    /* iface arrival/departure */
 258 #define RTM_IEEE80211   0x12    /* IEEE80211 wireless event */
 259
 260 /*
 261  * Bitmask values for rtm_inits and rmx_locks.
 262  */
 263 #define RTV_MTU         0x1     /* init or lock _mtu */
 264 #define RTV_HOPCOUNT    0x2     /* init or lock _hopcount */
 265 #define RTV_EXPIRE      0x4     /* init or lock _expire */
 266 #define RTV_RPIPE       0x8     /* init or lock _recvpipe */
 267 #define RTV_SPIPE       0x10    /* init or lock _sendpipe */
 268 #define RTV_SSTHRESH    0x20    /* init or lock _ssthresh */
 269 #define RTV_RTT         0x40    /* init or lock _rtt */
 270 #define RTV_RTTVAR      0x80    /* init or lock _rttvar */
 271
 272 /*
 273  * Bitmask values for rtm_addrs.
 274  */
 275 #define RTA_DST         0x1     /* destination sockaddr present */
 276 #define RTA_GATEWAY     0x2     /* gateway sockaddr present */
 277 #define RTA_NETMASK     0x4     /* netmask sockaddr present */
 278 #define RTA_GENMASK     0x8     /* cloning mask sockaddr present */
 279 #define RTA_IFP         0x10    /* interface name sockaddr present */
 280 #define RTA_IFA         0x20    /* interface addr sockaddr present */
 281 #define RTA_AUTHOR      0x40    /* sockaddr for author of redirect */
 282 #define RTA_BRD         0x80    /* for NEWADDR, broadcast or p-p dest addr */
 283
 284 /*
 285  * Index offsets for sockaddr array for alternate internal encoding.
 286  */
 287 #define RTAX_DST        0       /* destination sockaddr present */
 288 #define RTAX_GATEWAY    1       /* gateway sockaddr present */
 289 #define RTAX_NETMASK    2       /* netmask sockaddr present */
 290 #define RTAX_GENMASK    3       /* cloning mask sockaddr present */
 291 #define RTAX_IFP        4       /* interface name sockaddr present */
 292 #define RTAX_IFA        5       /* interface addr sockaddr present */
 293 #define RTAX_AUTHOR     6       /* sockaddr for author of redirect */
 294 #define RTAX_BRD        7       /* for NEWADDR, broadcast or p-p dest addr */
 295 #define RTAX_MAX        8       /* size of array to allocate */
 296
 297 struct rt_addrinfo {
 298         int              rti_addrs;
 299         struct sockaddr *rti_info[RTAX_MAX];
 300         int              rti_flags;
 301         struct ifaddr   *rti_ifa;
 302         struct ifnet    *rti_ifp;
 303 };
 304
 305 #ifdef _KERNEL
 306
 307 #define rti_dst         rti_info[RTAX_DST]
 308 #define rti_gateway     rti_info[RTAX_GATEWAY]
 309 #define rti_netmask     rti_info[RTAX_NETMASK]
 310 #define rti_genmask     rti_info[RTAX_GENMASK]
 311 #define rti_ifpaddr     rti_info[RTAX_IFP]
 312 #define rti_ifaaddr     rti_info[RTAX_IFA]
 313 #define rti_author      rti_info[RTAX_AUTHOR]
 314 #define rti_bcastaddr   rti_info[RTAX_BRD]
 315
 316 extern struct radix_node_head *rt_tables[MAXCPU][AF_MAX+1];
 317 extern struct lwkt_port *rt_ports[MAXCPU];
 318
 319 struct ifmultiaddr;
 320 struct proc;
 321 struct ucred;
 322
 323 void     route_init (void);
 324 void     rt_dstmsg(int type, struct sockaddr *dst, int error);
 325 int      rt_getifa (struct rt_addrinfo *);
 326 void     rt_ieee80211msg(struct ifnet *, int, void *, size_t);
 327 void     rt_ifannouncemsg (struct ifnet *, int);
 328 void     rt_ifmsg (struct ifnet *);
 329 int      rt_llroute (struct sockaddr *dst, struct rtentry *rt0,
 330             struct rtentry **drt);
 331 void     rt_missmsg (int, struct rt_addrinfo *, int, int);
 332 void     rt_newaddrmsg (int, struct ifaddr *, int, struct rtentry *);
 333 void     rt_newmaddrmsg (int, struct ifmultiaddr *);
 334 void     rt_rtmsg(int cmd, struct rtentry *rt, struct ifnet *ifp, int error);
 335 int      rt_setgate (struct rtentry *,
 336             struct sockaddr *, struct sockaddr *);
 337 void     rtalloc (struct route *);
 338 void     rtalloc_ign (struct route *, u_long);
 339
 340 struct rtentry *
 341          _rtlookup (struct sockaddr *, __boolean_t, u_long);
 342 #define         RTL_REPORTMSG   TRUE
 343 #define         RTL_DONTREPORT  FALSE
 344
 345 /* flags to ignore */
 346 #define         RTL_DOCLONE     0UL
 347 #define         RTL_DONTCLONE   (RTF_CLONING | RTF_PRCLONING)
 348
 349 /*
 350  * Look up a route with no cloning side-effects or miss reports generated.
 351  */
 352 static __inline struct rtentry *
 353 rtpurelookup(struct sockaddr *dst)
 354 {
 355         return _rtlookup(dst, RTL_DONTREPORT, RTL_DONTCLONE);
 356 }
 357
 358 /*
 359  * Do full route lookup with cloning and reporting on misses.
 360  */
 361 static __inline struct rtentry *
 362 rtlookup(struct sockaddr *dst)
 363 {
 364         return _rtlookup(dst, RTL_REPORTMSG, RTL_DOCLONE);
 365 }
 366
 367 typedef void (*rtrequest1_callback_func_t)(int, int, struct rt_addrinfo *,
 368                                       struct rtentry *, void *);
 369
 370 void     rtfree (struct rtentry *);
 371 int      rtinit (struct ifaddr *, int, int);
 372 int      rtioctl (u_long, caddr_t, struct ucred *);
 373 void     rtredirect (struct sockaddr *, struct sockaddr *,
 374             struct sockaddr *, int, struct sockaddr *);
 375 int      rtrequest (int, struct sockaddr *,
 376             struct sockaddr *, struct sockaddr *, int, struct rtentry **);
 377 int      rtrequest_global (int, struct sockaddr *,
 378             struct sockaddr *, struct sockaddr *, int);
 379 int      rtrequest1 (int, struct rt_addrinfo *, struct rtentry **);
 380 int      rtrequest1_global (int, struct rt_addrinfo *, rtrequest1_callback_func_t, void *);
 381
 382 void    rt_print(struct rt_addrinfo *, struct rtentry *);
 383 void    rt_addrinfo_print(int cmd, struct rt_addrinfo *);
 384 void    sockaddr_print(struct sockaddr *);
 385
 386 static __inline void
 387 RTFREE(struct rtentry *rt)
 388 {
 389         if (rt->rt_refcnt <= 1)
 390                 rtfree(rt);
 391         else
 392                 --rt->rt_refcnt;
 393 }
 394
 395 static __inline
 396 struct lwkt_port *
 397 rtable_portfn(int cpu)
 398 {
 399         return (rt_ports[cpu]);
 400 }
 401
 402 int     in_inithead(void **, int);
 403 #endif
 404
 405 #endif