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 8.3 (Berkeley) 4/19/94 34 * $Id: route.h,v 1.1.1.1 2006/05/30 06:12:46 hhzhou Exp $ 35 */ 36 37 #ifndef _NET_ROUTE_H_ 38 #define _NET_ROUTE_H_ 39 40 #define __P(protos) protos /* full-blown ANSI C */ 41 42 43 /* 44 * Kernel resident routing tables. 45 * 46 * The routing tables are initialized when interface addresses 47 * are set by making entries for all directly connected interfaces. 48 */ 49 50 /* 51 * A route consists of a destination address and a reference 52 * to a routing entry. These are often held by protocols 53 * in their control blocks, e.g. inpcb. 54 */ 55 struct route { 56 struct rtentry *ro_rt; 57 struct sockaddr ro_dst; 58 }; 59 60 /* 61 * These numbers are used by reliable protocols for determining 62 * retransmission behavior and are included in the routing structure. 63 */ 64 struct rt_metrics { 65 u_long rmx_locks; /* Kernel must leave these values alone */ 66 u_long rmx_mtu; /* MTU for this path */ 67 u_long rmx_hopcount; /* max hops expected */ 68 u_long rmx_expire; /* lifetime for route, e.g. redirect */ 69 u_long rmx_recvpipe; /* inbound delay-bandwidth product */ 70 u_long rmx_sendpipe; /* outbound delay-bandwidth product */ 71 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 72 u_long rmx_rtt; /* estimated round trip time */ 73 u_long rmx_rttvar; /* estimated rtt variance */ 74 u_long rmx_pksent; /* packets sent using this route */ 75 u_long rmx_filler[4]; /* will be used for T/TCP later */ 76 }; 77 78 /* 79 * rmx_rtt and rmx_rttvar are stored as microseconds; 80 * RTTTOPRHZ(rtt) converts to a value suitable for use 81 * by a protocol slowtimo counter. 82 */ 83 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */ 84 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ)) 85 86 /* 87 * XXX kernel function pointer `rt_output' is visible to applications. 88 */ 89 struct mbuf; 90 91 /* 92 * We distinguish between routes to hosts and routes to networks, 93 * preferring the former if available. For each route we infer 94 * the interface to use from the gateway address supplied when 95 * the route was entered. Routes that forward packets through 96 * gateways are marked so that the output routines know to address the 97 * gateway rather than the ultimate destination. 98 */ 99 #ifndef RNF_NORMAL 100 #include <net/radix.h> 101 #endif 102 struct rtentry { 103 struct radix_node rt_nodes[2]; /* tree glue, and other values */ 104 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key)) 105 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask)) 106 struct sockaddr *rt_gateway; /* value */ 107 short rt_filler; /* was short flags field */ 108 short rt_refcnt; /* # held references */ 109 u_long rt_flags; /* up/down?, host/net */ 110 struct ifnet *rt_ifp; /* the answer: interface to use */ 111 struct ifaddr *rt_ifa; /* the answer: interface to use */ 112 struct sockaddr *rt_genmask; /* for generation of cloned routes */ 113 caddr_t rt_llinfo; /* pointer to link level info cache */ 114 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */ 115 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */ 116 int (*rt_output) __P((struct ifnet *, struct mbuf *, 117 struct sockaddr *, struct rtentry *)); 118 /* output routine for this (rt,if) */ 119 struct rtentry *rt_parent; /* cloning parent of this route */ 120 void *rt_filler2; /* more filler */ 121 }; 122 123 /* 124 * Following structure necessary for 4.3 compatibility; 125 * We should eventually move it to a compat file. 126 */ 127 struct ortentry { 128 u_long rt_hash; /* to speed lookups */ 129 struct sockaddr rt_dst; /* key */ 130 struct sockaddr rt_gateway; /* value */ 131 short rt_flags; /* up/down?, host/net */ 132 short rt_refcnt; /* # held references */ 133 u_long rt_use; /* raw # packets forwarded */ 134 struct ifnet *rt_ifp; /* the answer: interface to use */ 135 }; 136 137 #define rt_use rt_rmx.rmx_pksent 138 139 #define RTF_UP 0x1 /* route usable */ 140 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 141 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 142 #define RTF_REJECT 0x8 /* host or net unreachable */ 143 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */ 144 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */ 145 #define RTF_DONE 0x40 /* message confirmed */ 146 /* 0x80 unused */ 147 #define RTF_CLONING 0x100 /* generate new routes on use */ 148 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */ 149 #define RTF_LLINFO 0x400 /* generated by link layer (e.g. ARP) */ 150 #define RTF_STATIC 0x800 /* manually added */ 151 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */ 152 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */ 153 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */ 154 155 #define RTF_PRCLONING 0x10000 /* protocol requires cloning */ 156 #define RTF_WASCLONED 0x20000 /* route generated through cloning */ 157 #define RTF_PROTO3 0x40000 /* protocol specific routing flag */ 158 /* 0x80000 unused */ 159 #define RTF_PINNED 0x100000 /* future use */ 160 #define RTF_LOCAL 0x200000 /* route represents a local address */ 161 #define RTF_BROADCAST 0x400000 /* route represents a bcast address */ 162 #define RTF_MULTICAST 0x800000 /* route represents a mcast address */ 163 /* 0x1000000 and up unassigned */ 164 165 /* 166 * Routing statistics. 167 */ 168 struct rtstat { 169 short rts_badredirect; /* bogus redirect calls */ 170 short rts_dynamic; /* routes created by redirects */ 171 short rts_newgateway; /* routes modified by redirects */ 172 short rts_unreach; /* lookups which failed */ 173 short rts_wildcard; /* lookups satisfied by a wildcard */ 174 }; 175 /* 176 * Structures for routing messages. 177 */ 178 struct rt_msghdr { 179 u_short rtm_msglen; /* to skip over non-understood messages */ 180 u_char rtm_version; /* future binary compatibility */ 181 u_char rtm_type; /* message type */ 182 u_short rtm_index; /* index for associated ifp */ 183 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 184 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 185 pid_t rtm_pid; /* identify sender */ 186 int rtm_seq; /* for sender to identify action */ 187 int rtm_errno; /* why failed */ 188 int rtm_use; /* from rtentry */ 189 u_long rtm_inits; /* which metrics we are initializing */ 190 struct rt_metrics rtm_rmx; /* metrics themselves */ 191 }; 192 193 #define RTM_VERSION 5 /* Up the ante and ignore older versions */ 194 195 #define RTM_ADD 0x1 /* Add Route */ 196 #define RTM_DELETE 0x2 /* Delete Route */ 197 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 198 #define RTM_GET 0x4 /* Report Metrics */ 199 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 200 #define RTM_REDIRECT 0x6 /* Told to use different route */ 201 #define RTM_MISS 0x7 /* Lookup failed on this address */ 202 #define RTM_LOCK 0x8 /* fix specified metrics */ 203 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */ 204 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */ 205 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 206 #define RTM_NEWADDR 0xc /* address being added to iface */ 207 #define RTM_DELADDR 0xd /* address being removed from iface */ 208 #define RTM_IFINFO 0xe /* iface going up/down etc. */ 209 #define RTM_NEWMADDR 0xf /* mcast group membership being added to if */ 210 #define RTM_DELMADDR 0x10 /* mcast group membership being deleted */ 211 212 #define RTV_MTU 0x1 /* init or lock _mtu */ 213 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 214 #define RTV_EXPIRE 0x4 /* init or lock _hopcount */ 215 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 216 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 217 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 218 #define RTV_RTT 0x40 /* init or lock _rtt */ 219 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 220 221 /* 222 * Bitmask values for rtm_addr. 223 */ 224 #define RTA_DST 0x1 /* destination sockaddr present */ 225 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 226 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 227 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 228 #define RTA_IFP 0x10 /* interface name sockaddr present */ 229 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 230 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 231 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */ 232 233 /* 234 * Index offsets for sockaddr array for alternate internal encoding. 235 */ 236 #define RTAX_DST 0 /* destination sockaddr present */ 237 #define RTAX_GATEWAY 1 /* gateway sockaddr present */ 238 #define RTAX_NETMASK 2 /* netmask sockaddr present */ 239 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */ 240 #define RTAX_IFP 4 /* interface name sockaddr present */ 241 #define RTAX_IFA 5 /* interface addr sockaddr present */ 242 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */ 243 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */ 244 #define RTAX_MAX 8 /* size of array to allocate */ 245 246 struct rt_addrinfo { 247 int rti_addrs; 248 struct sockaddr *rti_info[RTAX_MAX]; 249 }; 250 251 struct route_cb { 252 int ip_count; 253 int ipx_count; 254 int ns_count; 255 int iso_count; 256 int any_count; 257 }; 258 259 #ifdef KERNEL 260 #define RTFREE(rt) \ 261 if ((rt)->rt_refcnt <= 1) \ 262 rtfree(rt); \ 263 else \ 264 (rt)->rt_refcnt--; 265 266 extern struct route_cb route_cb; 267 extern struct radix_node_head *rt_tables[AF_MAX+1]; 268 269 struct ifmultiaddr; 270 struct proc; 271 272 void route_init __P((void)); 273 void rt_ifmsg __P((struct ifnet *)); 274 void rt_missmsg __P((int, struct rt_addrinfo *, int, int)); 275 void rt_newaddrmsg __P((int, struct ifaddr *, int, struct rtentry *)); 276 void rt_newmaddrmsg __P((int, struct ifmultiaddr *)); 277 int rt_setgate __P((struct rtentry *, 278 struct sockaddr *, struct sockaddr *)); 279 void rtalloc __P((struct route *)); 280 void rtalloc_ign __P((struct route *, unsigned long)); 281 struct rtentry * 282 rtalloc1 __P((struct sockaddr *, int, unsigned long)); 283 void rtfree __P((struct rtentry *)); 284 int rtinit __P((struct ifaddr *, int, int)); 285 int rtioctl __P((int, caddr_t, struct proc *)); 286 void rtredirect __P((struct sockaddr *, struct sockaddr *, 287 struct sockaddr *, int, struct sockaddr *, struct rtentry **)); 288 int rtrequest __P((int, struct sockaddr *, 289 struct sockaddr *, struct sockaddr *, int, struct rtentry **)); 290 #endif 291 292 #endif 293