route.h revision 1.1
1 /* 2 * Copyright (c) 1980, 1986 Regents of the University of California. 3 * 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 7.13 (Berkeley) 4/25/91 34 */ 35 36 /* 37 * Kernel resident routing tables. 38 * 39 * The routing tables are initialized when interface addresses 40 * are set by making entries for all directly connected interfaces. 41 */ 42 43 /* 44 * A route consists of a destination address and a reference 45 * to a routing entry. These are often held by protocols 46 * in their control blocks, e.g. inpcb. 47 */ 48 struct route { 49 struct rtentry *ro_rt; 50 struct sockaddr ro_dst; 51 }; 52 53 /* 54 * These numbers are used by reliable protocols for determining 55 * retransmission behavior and are included in the routing structure. 56 */ 57 struct rt_metrics { 58 u_long rmx_locks; /* Kernel must leave these values alone */ 59 u_long rmx_mtu; /* MTU for this path */ 60 u_long rmx_hopcount; /* max hops expected */ 61 u_long rmx_expire; /* lifetime for route, e.g. redirect */ 62 u_long rmx_recvpipe; /* inbound delay-bandwith product */ 63 u_long rmx_sendpipe; /* outbound delay-bandwith product */ 64 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 65 u_long rmx_rtt; /* estimated round trip time */ 66 u_long rmx_rttvar; /* estimated rtt variance */ 67 }; 68 69 /* 70 * rmx_rtt and rmx_rttvar are stored as microseconds; 71 * RTTTOPRHZ(rtt) converts to a value suitable for use 72 * by a protocol slowtimo counter. 73 */ 74 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */ 75 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ)) 76 77 /* 78 * We distinguish between routes to hosts and routes to networks, 79 * preferring the former if available. For each route we infer 80 * the interface to use from the gateway address supplied when 81 * the route was entered. Routes that forward packets through 82 * gateways are marked so that the output routines know to address the 83 * gateway rather than the ultimate destination. 84 */ 85 #ifndef RNF_NORMAL 86 #include "radix.h" 87 #endif 88 struct rtentry { 89 struct radix_node rt_nodes[2]; /* tree glue, and other values */ 90 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key)) 91 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask)) 92 struct sockaddr *rt_gateway; /* value */ 93 short rt_flags; /* up/down?, host/net */ 94 short rt_refcnt; /* # held references */ 95 u_long rt_use; /* raw # packets forwarded */ 96 struct ifnet *rt_ifp; /* the answer: interface to use */ 97 struct ifaddr *rt_ifa; /* the answer: interface to use */ 98 struct sockaddr *rt_genmask; /* for generation of cloned routes */ 99 caddr_t rt_llinfo; /* pointer to link level info cache */ 100 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */ 101 short rt_idle; /* easy to tell llayer still live */ 102 }; 103 104 /* 105 * Following structure necessary for 4.3 compatibility; 106 * We should eventually move it to a compat file. 107 */ 108 struct ortentry { 109 u_long rt_hash; /* to speed lookups */ 110 struct sockaddr rt_dst; /* key */ 111 struct sockaddr rt_gateway; /* value */ 112 short rt_flags; /* up/down?, host/net */ 113 short rt_refcnt; /* # held references */ 114 u_long rt_use; /* raw # packets forwarded */ 115 struct ifnet *rt_ifp; /* the answer: interface to use */ 116 }; 117 118 #define RTF_UP 0x1 /* route useable */ 119 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 120 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 121 #define RTF_REJECT 0x8 /* host or net unreachable */ 122 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */ 123 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */ 124 #define RTF_DONE 0x40 /* message confirmed */ 125 #define RTF_MASK 0x80 /* subnet mask present */ 126 #define RTF_CLONING 0x100 /* generate new routes on use */ 127 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */ 128 #define RTF_LLINFO 0x400 /* generated by ARP or ESIS */ 129 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */ 130 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */ 131 132 133 /* 134 * Routing statistics. 135 */ 136 struct rtstat { 137 short rts_badredirect; /* bogus redirect calls */ 138 short rts_dynamic; /* routes created by redirects */ 139 short rts_newgateway; /* routes modified by redirects */ 140 short rts_unreach; /* lookups which failed */ 141 short rts_wildcard; /* lookups satisfied by a wildcard */ 142 }; 143 /* 144 * Structures for routing messages. 145 */ 146 struct rt_msghdr { 147 u_short rtm_msglen; /* to skip over non-understood messages */ 148 u_char rtm_version; /* future binary compatability */ 149 u_char rtm_type; /* message type */ 150 u_short rtm_index; /* index for associated ifp */ 151 pid_t rtm_pid; /* identify sender */ 152 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 153 int rtm_seq; /* for sender to identify action */ 154 int rtm_errno; /* why failed */ 155 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 156 int rtm_use; /* from rtentry */ 157 u_long rtm_inits; /* which metrics we are initializing */ 158 struct rt_metrics rtm_rmx; /* metrics themselves */ 159 }; 160 161 struct route_cb { 162 int ip_count; 163 int ns_count; 164 int iso_count; 165 int any_count; 166 }; 167 #define RTM_VERSION 2 /* Up the ante and ignore older versions */ 168 169 #define RTM_ADD 0x1 /* Add Route */ 170 #define RTM_DELETE 0x2 /* Delete Route */ 171 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 172 #define RTM_GET 0x4 /* Report Metrics */ 173 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 174 #define RTM_REDIRECT 0x6 /* Told to use different route */ 175 #define RTM_MISS 0x7 /* Lookup failed on this address */ 176 #define RTM_LOCK 0x8 /* fix specified metrics */ 177 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */ 178 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */ 179 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 180 181 #define RTV_MTU 0x1 /* init or lock _mtu */ 182 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 183 #define RTV_EXPIRE 0x4 /* init or lock _hopcount */ 184 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 185 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 186 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 187 #define RTV_RTT 0x40 /* init or lock _rtt */ 188 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 189 190 #define RTA_DST 0x1 /* destination sockaddr present */ 191 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 192 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 193 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 194 #define RTA_IFP 0x10 /* interface name sockaddr present */ 195 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 196 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 197 198 #ifdef KERNEL 199 struct route_cb route_cb; 200 #endif 201 202 #ifdef KERNEL 203 #define RTFREE(rt) \ 204 if ((rt)->rt_refcnt <= 1) \ 205 rtfree(rt); \ 206 else \ 207 (rt)->rt_refcnt--; 208 209 #ifdef GATEWAY 210 #define RTHASHSIZ 64 211 #else 212 #define RTHASHSIZ 8 213 #endif 214 #if (RTHASHSIZ & (RTHASHSIZ - 1)) == 0 215 #define RTHASHMOD(h) ((h) & (RTHASHSIZ - 1)) 216 #else 217 #define RTHASHMOD(h) ((h) % RTHASHSIZ) 218 #endif 219 struct mbuf *rthost[RTHASHSIZ]; 220 struct mbuf *rtnet[RTHASHSIZ]; 221 struct rtstat rtstat; 222 struct rtentry *rtalloc1(); 223 #endif 224
Indexes created Tue Sep 23 23:09:58 GMT 2025