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 are permitted 6 * provided that the above copyright notice and this paragraph are 7 * duplicated in all such forms and that any documentation, 8 * advertising materials, and other materials related to such 9 * distribution and use acknowledge that the software was developed 10 * by the University of California, Berkeley. The name of the 11 * University may not be used to endorse or promote products derived 12 * from this software without specific prior written permission. 13 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR 14 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED 15 * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. 16 * 17 * @(#)route.h 7.8 (Berkeley) 04/05/90 18 */ 19 20 /* 21 * Kernel resident routing tables. 22 * 23 * The routing tables are initialized when interface addresses 24 * are set by making entries for all directly connected interfaces. 25 */ 26 27 /* 28 * A route consists of a destination address and a reference 29 * to a routing entry. These are often held by protocols 30 * in their control blocks, e.g. inpcb. 31 */ 32 struct route { 33 struct rtentry *ro_rt; 34 struct sockaddr ro_dst; 35 }; 36 37 /* 38 * These numbers are used by reliable protocols for determining 39 * retransmission behavior and are included in the routing structure. 40 */ 41 struct rt_metrics { 42 u_long rmx_locks; /* Kernel must leave these values alone */ 43 u_long rmx_mtu; /* MTU for this path */ 44 u_long rmx_hopcount; /* max hops expected */ 45 u_long rmx_expire; /* lifetime for route, e.g. redirect */ 46 u_long rmx_recvpipe; /* inbound delay-bandwith product */ 47 u_long rmx_sendpipe; /* outbound delay-bandwith product */ 48 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 49 u_long rmx_rtt; /* estimated round trip time */ 50 u_long rmx_rttvar; /* estimated rtt variance */ 51 }; 52 53 /* 54 * We distinguish between routes to hosts and routes to networks, 55 * preferring the former if available. For each route we infer 56 * the interface to use from the gateway address supplied when 57 * the route was entered. Routes that forward packets through 58 * gateways are marked so that the output routines know to address the 59 * gateway rather than the ultimate destination. 60 */ 61 #include "radix.h" 62 struct rtentry { 63 struct radix_node rt_nodes[2]; /* tree glue, and other values */ 64 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key)) 65 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask)) 66 struct sockaddr *rt_gateway; /* value */ 67 short rt_flags; /* up/down?, host/net */ 68 short rt_refcnt; /* # held references */ 69 u_long rt_use; /* raw # packets forwarded */ 70 struct ifnet *rt_ifp; /* the answer: interface to use */ 71 struct ifaddr *rt_ifa; /* the answer: interface to use */ 72 struct sockaddr *rt_genmask; /* for generation of cloned routes */ 73 caddr_t rt_llinfo; /* pointer to link level info cache */ 74 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */ 75 }; 76 77 /* 78 * Following structure necessary for 4.3 compatibility; 79 * We should eventually move it to a compat file. 80 */ 81 struct ortentry { 82 u_long rt_hash; /* to speed lookups */ 83 struct sockaddr rt_dst; /* key */ 84 struct sockaddr rt_gateway; /* value */ 85 short rt_flags; /* up/down?, host/net */ 86 short rt_refcnt; /* # held references */ 87 u_long rt_use; /* raw # packets forwarded */ 88 struct ifnet *rt_ifp; /* the answer: interface to use */ 89 }; 90 91 #define RTF_UP 0x1 /* route useable */ 92 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 93 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 94 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */ 95 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */ 96 #define RTF_DONE 0x40 /* message confirmed */ 97 #define RTF_MASK 0x80 /* subnet mask present */ 98 #define RTF_CLONING 0x100 /* generate new routes on use */ 99 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */ 100 101 102 /* 103 * Routing statistics. 104 */ 105 struct rtstat { 106 short rts_badredirect; /* bogus redirect calls */ 107 short rts_dynamic; /* routes created by redirects */ 108 short rts_newgateway; /* routes modified by redirects */ 109 short rts_unreach; /* lookups which failed */ 110 short rts_wildcard; /* lookups satisfied by a wildcard */ 111 }; 112 /* 113 * Structures for routing messages. 114 */ 115 struct rt_msghdr { 116 u_short rtm_msglen; /* to skip over non-understood messages */ 117 u_char rtm_version; /* future binary compatability */ 118 u_char rtm_type; /* message type */ 119 u_short rtm_index; /* index for associated ifp */ 120 pid_t rtm_pid; /* identify sender */ 121 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 122 int rtm_seq; /* for sender to identify action */ 123 int rtm_errno; /* why failed */ 124 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 125 int rtm_use; /* from rtentry */ 126 u_long rtm_inits; /* which metrics we are initializing */ 127 struct rt_metrics rtm_rmx; /* metrics themselves */ 128 }; 129 130 struct route_cb { 131 int ip_count; 132 int ns_count; 133 int iso_count; 134 int any_count; 135 }; 136 #define RTM_VERSION 2 /* Up the ante and ignore older versions */ 137 138 #define RTM_ADD 0x1 /* Add Route */ 139 #define RTM_DELETE 0x2 /* Delete Route */ 140 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 141 #define RTM_GET 0x4 /* Report Metrics */ 142 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 143 #define RTM_REDIRECT 0x6 /* Told to use different route */ 144 #define RTM_MISS 0x7 /* Lookup failed on this address */ 145 #define RTM_LOCK 0x8 /* fix specified metrics */ 146 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */ 147 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */ 148 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 149 150 #define RTV_MTU 0x1 /* init or lock _mtu */ 151 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 152 #define RTV_EXPIRE 0x4 /* init or lock _hopcount */ 153 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 154 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 155 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 156 #define RTV_RTT 0x40 /* init or lock _rtt */ 157 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 158 159 #define RTA_DST 0x1 /* destination sockaddr present */ 160 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 161 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 162 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 163 #define RTA_IFP 0x10 /* interface name sockaddr present */ 164 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 165 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 166 167 #ifdef KERNEL 168 struct route_cb route_cb; 169 #endif 170 171 #ifdef KERNEL 172 #define RTFREE(rt) \ 173 if ((rt)->rt_refcnt <= 1) \ 174 rtfree(rt); \ 175 else \ 176 (rt)->rt_refcnt--; 177 178 #ifdef GATEWAY 179 #define RTHASHSIZ 64 180 #else 181 #define RTHASHSIZ 8 182 #endif 183 #if (RTHASHSIZ & (RTHASHSIZ - 1)) == 0 184 #define RTHASHMOD(h) ((h) & (RTHASHSIZ - 1)) 185 #else 186 #define RTHASHMOD(h) ((h) % RTHASHSIZ) 187 #endif 188 struct mbuf *rthost[RTHASHSIZ]; 189 struct mbuf *rtnet[RTHASHSIZ]; 190 struct rtstat rtstat; 191 struct rtentry *rtalloc1(); 192 #endif 193