route.h revision 122334
1/* 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)route.h 8.4 (Berkeley) 1/9/95 34 * $FreeBSD: head/sys/net/route.h 122334 2003-11-08 23:36:32Z sam $ 35 */ 36 37#ifndef _NET_ROUTE_H_ 38#define _NET_ROUTE_H_ 39 40/* 41 * Kernel resident routing tables. 42 * 43 * The routing tables are initialized when interface addresses 44 * are set by making entries for all directly connected interfaces. 45 */ 46 47/* 48 * A route consists of a destination address and a reference 49 * to a routing entry. These are often held by protocols 50 * in their control blocks, e.g. inpcb. 51 */ 52struct route { 53 struct rtentry *ro_rt; 54 struct sockaddr ro_dst; 55}; 56 57/* 58 * These numbers are used by reliable protocols for determining 59 * retransmission behavior and are included in the routing structure. 60 */ 61struct rt_metrics { 62 u_long rmx_locks; /* Kernel must leave these values alone */ 63 u_long rmx_mtu; /* MTU for this path */ 64 u_long rmx_hopcount; /* max hops expected */ 65 u_long rmx_expire; /* lifetime for route, e.g. redirect */ 66 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 67 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 68 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 69 u_long rmx_rtt; /* estimated round trip time */ 70 u_long rmx_rttvar; /* estimated rtt variance */ 71 u_long rmx_pksent; /* packets sent using this route */ 72 u_long rmx_filler[4]; /* will be used for T/TCP later */ 73}; 74 75/* 76 * rmx_rtt and rmx_rttvar are stored as microseconds; 77 * RTTTOPRHZ(rtt) converts to a value suitable for use 78 * by a protocol slowtimo counter. 79 */ 80#define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */ 81#define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ)) 82 83/* 84 * XXX kernel function pointer `rt_output' is visible to applications. 85 */ 86struct mbuf; 87 88/* 89 * We distinguish between routes to hosts and routes to networks, 90 * preferring the former if available. For each route we infer 91 * the interface to use from the gateway address supplied when 92 * the route was entered. Routes that forward packets through 93 * gateways are marked so that the output routines know to address the 94 * gateway rather than the ultimate destination. 95 */ 96#ifndef RNF_NORMAL 97#include <net/radix.h> 98#endif 99struct rtentry { 100 struct radix_node rt_nodes[2]; /* tree glue, and other values */ 101#define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key)) 102#define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask)) 103 struct sockaddr *rt_gateway; /* value */ 104 long rt_refcnt; /* # held references */ 105 u_long rt_flags; /* up/down?, host/net */ 106 struct ifnet *rt_ifp; /* the answer: interface to use */ 107 struct ifaddr *rt_ifa; /* the answer: interface to use */ 108 struct sockaddr *rt_genmask; /* for generation of cloned routes */ 109 caddr_t rt_llinfo; /* pointer to link level info cache */ 110 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */ 111 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */ 112 int (*rt_output)(struct ifnet *, struct mbuf *, struct sockaddr *, 113 struct rtentry *); 114 /* output routine for this (rt,if) */ 115 struct rtentry *rt_parent; /* cloning parent of this route */ 116#ifdef _KERNEL 117 /* XXX ugly, user apps use this definition but don't have a mtx def */ 118 struct mtx rt_mtx; /* mutex for routing entry */ 119#endif 120}; 121 122/* 123 * Following structure necessary for 4.3 compatibility; 124 * We should eventually move it to a compat file. 125 */ 126struct ortentry { 127 u_long rt_hash; /* to speed lookups */ 128 struct sockaddr rt_dst; /* key */ 129 struct sockaddr rt_gateway; /* value */ 130 short rt_flags; /* up/down?, host/net */ 131 short rt_refcnt; /* # held references */ 132 u_long rt_use; /* raw # packets forwarded */ 133 struct ifnet *rt_ifp; /* the answer: interface to use */ 134}; 135 136#define rt_use rt_rmx.rmx_pksent 137 138#define RTF_UP 0x1 /* route usable */ 139#define RTF_GATEWAY 0x2 /* destination is a gateway */ 140#define RTF_HOST 0x4 /* host entry (net otherwise) */ 141#define RTF_REJECT 0x8 /* host or net unreachable */ 142#define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */ 143#define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */ 144#define RTF_DONE 0x40 /* message confirmed */ 145/* 0x80 unused, was RTF_DELCLONE */ 146#define RTF_CLONING 0x100 /* generate new routes on use */ 147#define RTF_XRESOLVE 0x200 /* external daemon resolves name */ 148#define RTF_LLINFO 0x400 /* generated by link layer (e.g. ARP) */ 149#define RTF_STATIC 0x800 /* manually added */ 150#define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */ 151#define RTF_PROTO2 0x4000 /* protocol specific routing flag */ 152#define RTF_PROTO1 0x8000 /* protocol specific routing flag */ 153 154#define RTF_PRCLONING 0x10000 /* protocol requires cloning */ 155#define RTF_WASCLONED 0x20000 /* route generated through cloning */ 156#define RTF_PROTO3 0x40000 /* protocol specific routing flag */ 157/* 0x80000 unused */ 158#define RTF_PINNED 0x100000 /* future use */ 159#define RTF_LOCAL 0x200000 /* route represents a local address */ 160#define RTF_BROADCAST 0x400000 /* route represents a bcast address */ 161#define RTF_MULTICAST 0x800000 /* route represents a mcast address */ 162 /* 0x1000000 and up unassigned */ 163 164/* 165 * Routing statistics. 166 */ 167struct rtstat { 168 short rts_badredirect; /* bogus redirect calls */ 169 short rts_dynamic; /* routes created by redirects */ 170 short rts_newgateway; /* routes modified by redirects */ 171 short rts_unreach; /* lookups which failed */ 172 short rts_wildcard; /* lookups satisfied by a wildcard */ 173}; 174/* 175 * Structures for routing messages. 176 */ 177struct rt_msghdr { 178 u_short rtm_msglen; /* to skip over non-understood messages */ 179 u_char rtm_version; /* future binary compatibility */ 180 u_char rtm_type; /* message type */ 181 u_short rtm_index; /* index for associated ifp */ 182 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 183 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 184 pid_t rtm_pid; /* identify sender */ 185 int rtm_seq; /* for sender to identify action */ 186 int rtm_errno; /* why failed */ 187 int rtm_use; /* from rtentry */ 188 u_long rtm_inits; /* which metrics we are initializing */ 189 struct rt_metrics rtm_rmx; /* metrics themselves */ 190}; 191 192#define RTM_VERSION 5 /* Up the ante and ignore older versions */ 193 194/* 195 * Message types. 196 */ 197#define RTM_ADD 0x1 /* Add Route */ 198#define RTM_DELETE 0x2 /* Delete Route */ 199#define RTM_CHANGE 0x3 /* Change Metrics or flags */ 200#define RTM_GET 0x4 /* Report Metrics */ 201#define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 202#define RTM_REDIRECT 0x6 /* Told to use different route */ 203#define RTM_MISS 0x7 /* Lookup failed on this address */ 204#define RTM_LOCK 0x8 /* fix specified metrics */ 205#define RTM_OLDADD 0x9 /* caused by SIOCADDRT */ 206#define RTM_OLDDEL 0xa /* caused by SIOCDELRT */ 207#define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 208#define RTM_NEWADDR 0xc /* address being added to iface */ 209#define RTM_DELADDR 0xd /* address being removed from iface */ 210#define RTM_IFINFO 0xe /* iface going up/down etc. */ 211#define RTM_NEWMADDR 0xf /* mcast group membership being added to if */ 212#define RTM_DELMADDR 0x10 /* mcast group membership being deleted */ 213#define RTM_IFANNOUNCE 0x11 /* iface arrival/departure */ 214 215/* 216 * Bitmask values for rtm_inits and rmx_locks. 217 */ 218#define RTV_MTU 0x1 /* init or lock _mtu */ 219#define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 220#define RTV_EXPIRE 0x4 /* init or lock _expire */ 221#define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 222#define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 223#define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 224#define RTV_RTT 0x40 /* init or lock _rtt */ 225#define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 226 227/* 228 * Bitmask values for rtm_addrs. 229 */ 230#define RTA_DST 0x1 /* destination sockaddr present */ 231#define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 232#define RTA_NETMASK 0x4 /* netmask sockaddr present */ 233#define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 234#define RTA_IFP 0x10 /* interface name sockaddr present */ 235#define RTA_IFA 0x20 /* interface addr sockaddr present */ 236#define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 237#define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */ 238 239/* 240 * Index offsets for sockaddr array for alternate internal encoding. 241 */ 242#define RTAX_DST 0 /* destination sockaddr present */ 243#define RTAX_GATEWAY 1 /* gateway sockaddr present */ 244#define RTAX_NETMASK 2 /* netmask sockaddr present */ 245#define RTAX_GENMASK 3 /* cloning mask sockaddr present */ 246#define RTAX_IFP 4 /* interface name sockaddr present */ 247#define RTAX_IFA 5 /* interface addr sockaddr present */ 248#define RTAX_AUTHOR 6 /* sockaddr for author of redirect */ 249#define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */ 250#define RTAX_MAX 8 /* size of array to allocate */ 251 252struct rt_addrinfo { 253 int rti_addrs; 254 struct sockaddr *rti_info[RTAX_MAX]; 255 int rti_flags; 256 struct ifaddr *rti_ifa; 257 struct ifnet *rti_ifp; 258}; 259 260#ifdef _KERNEL 261 262#define RT_LOCK_INIT(_rt) \ 263 mtx_init(&(_rt)->rt_mtx, "rtentry", NULL, MTX_DEF | MTX_DUPOK) 264#define RT_LOCK(_rt) mtx_lock(&(_rt)->rt_mtx) 265#define RT_UNLOCK(_rt) mtx_unlock(&(_rt)->rt_mtx) 266#define RT_LOCK_DESTROY(_rt) mtx_destroy(&(_rt)->rt_mtx) 267#define RT_LOCK_ASSERT(_rt) mtx_assert(&(_rt)->rt_mtx, MA_OWNED) 268 269#define RT_ADDREF(_rt) do { \ 270 RT_LOCK_ASSERT(_rt); \ 271 KASSERT((_rt)->rt_refcnt >= 0, \ 272 ("negative refcnt %ld", (_rt)->rt_refcnt)); \ 273 (_rt)->rt_refcnt++; \ 274} while (0); 275#define RT_REMREF(_rt) do { \ 276 RT_LOCK_ASSERT(_rt); \ 277 KASSERT((_rt)->rt_refcnt > 0, \ 278 ("bogus refcnt %ld", (_rt)->rt_refcnt)); \ 279 (_rt)->rt_refcnt--; \ 280} while (0); 281 282#define RTFREE_LOCKED(_rt) do { \ 283 if ((_rt)->rt_refcnt <= 1) \ 284 rtfree(_rt); \ 285 else { \ 286 RT_REMREF(_rt); \ 287 RT_UNLOCK(_rt); \ 288 } \ 289 /* guard against invalid refs */ \ 290 _rt = 0; \ 291 } while (0) 292#define RTFREE(_rt) do { \ 293 RT_LOCK(_rt); \ 294 RTFREE_LOCKED(_rt); \ 295 } while (0) 296 297extern struct radix_node_head *rt_tables[AF_MAX+1]; 298 299struct ifmultiaddr; 300 301void route_init(void); 302int rt_getifa(struct rt_addrinfo *); 303void rt_ifannouncemsg(struct ifnet *, int); 304void rt_ifmsg(struct ifnet *); 305void rt_missmsg(int, struct rt_addrinfo *, int, int); 306void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *); 307void rt_newmaddrmsg(int, struct ifmultiaddr *); 308void rtalloc(struct route *); 309int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *); 310void rtalloc_ign(struct route *, u_long); 311/* NB: the rtentry is returned locked */ 312struct rtentry *rtalloc1(struct sockaddr *, int, u_long); 313int rtexpunge(struct rtentry *); 314void rtfree(struct rtentry *); 315int rtinit(struct ifaddr *, int, int); 316int rtioctl(u_long, caddr_t); 317void rtredirect(struct sockaddr *, struct sockaddr *, 318 struct sockaddr *, int, struct sockaddr *); 319int rtrequest(int, struct sockaddr *, 320 struct sockaddr *, struct sockaddr *, int, struct rtentry **); 321int rtrequest1(int, struct rt_addrinfo *, struct rtentry **); 322int rt_check(struct rtentry **, struct rtentry **, struct sockaddr *); 323#endif 324 325#endif 326