| 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 |