1 /* 2 * Copyright (c) 1980, 1986 Regents of the University of California. 3 * All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)route.h 7.12 (Berkeley) 07/26/90 8 */ 9 10 /* 11 * Kernel resident routing tables. 12 * 13 * The routing tables are initialized when interface addresses 14 * are set by making entries for all directly connected interfaces. 15 */ 16 17 /* 18 * A route consists of a destination address and a reference 19 * to a routing entry. These are often held by protocols 20 * in their control blocks, e.g. inpcb. 21 */ 22 struct route { 23 struct rtentry *ro_rt; 24 struct sockaddr ro_dst; 25 }; 26 27 /* 28 * These numbers are used by reliable protocols for determining 29 * retransmission behavior and are included in the routing structure. 30 */ 31 struct rt_metrics { 32 u_long rmx_locks; /* Kernel must leave these values alone */ 33 u_long rmx_mtu; /* MTU for this path */ 34 u_long rmx_hopcount; /* max hops expected */ 35 u_long rmx_expire; /* lifetime for route, e.g. redirect */ 36 u_long rmx_recvpipe; /* inbound delay-bandwith product */ 37 u_long rmx_sendpipe; /* outbound delay-bandwith product */ 38 u_long rmx_ssthresh; /* outbound gateway buffer limit */ 39 u_long rmx_rtt; /* estimated round trip time */ 40 u_long rmx_rttvar; /* estimated rtt variance */ 41 }; 42 43 /* 44 * rmx_rtt and rmx_rttvar are stored as microseconds; 45 * RTTTOPRHZ(rtt) converts to a value suitable for use 46 * by a protocol slowtimo counter. 47 */ 48 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */ 49 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ)) 50 51 /* 52 * We distinguish between routes to hosts and routes to networks, 53 * preferring the former if available. For each route we infer 54 * the interface to use from the gateway address supplied when 55 * the route was entered. Routes that forward packets through 56 * gateways are marked so that the output routines know to address the 57 * gateway rather than the ultimate destination. 58 */ 59 #include "radix.h" 60 struct rtentry { 61 struct radix_node rt_nodes[2]; /* tree glue, and other values */ 62 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key)) 63 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask)) 64 struct sockaddr *rt_gateway; /* value */ 65 short rt_flags; /* up/down?, host/net */ 66 short rt_refcnt; /* # held references */ 67 u_long rt_use; /* raw # packets forwarded */ 68 struct ifnet *rt_ifp; /* the answer: interface to use */ 69 struct ifaddr *rt_ifa; /* the answer: interface to use */ 70 struct sockaddr *rt_genmask; /* for generation of cloned routes */ 71 caddr_t rt_llinfo; /* pointer to link level info cache */ 72 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */ 73 short rt_idle; /* easy to tell llayer still live */ 74 }; 75 76 /* 77 * Following structure necessary for 4.3 compatibility; 78 * We should eventually move it to a compat file. 79 */ 80 struct ortentry { 81 u_long rt_hash; /* to speed lookups */ 82 struct sockaddr rt_dst; /* key */ 83 struct sockaddr rt_gateway; /* value */ 84 short rt_flags; /* up/down?, host/net */ 85 short rt_refcnt; /* # held references */ 86 u_long rt_use; /* raw # packets forwarded */ 87 struct ifnet *rt_ifp; /* the answer: interface to use */ 88 }; 89 90 #define RTF_UP 0x1 /* route useable */ 91 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 92 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 93 #define RTF_REJECT 0x8 /* host or net unreachable */ 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 #define RTF_LLINFO 0x400 /* generated by ARP or ESIS */ 101 102 103 /* 104 * Routing statistics. 105 */ 106 struct rtstat { 107 short rts_badredirect; /* bogus redirect calls */ 108 short rts_dynamic; /* routes created by redirects */ 109 short rts_newgateway; /* routes modified by redirects */ 110 short rts_unreach; /* lookups which failed */ 111 short rts_wildcard; /* lookups satisfied by a wildcard */ 112 }; 113 /* 114 * Structures for routing messages. 115 */ 116 struct rt_msghdr { 117 u_short rtm_msglen; /* to skip over non-understood messages */ 118 u_char rtm_version; /* future binary compatability */ 119 u_char rtm_type; /* message type */ 120 u_short rtm_index; /* index for associated ifp */ 121 pid_t rtm_pid; /* identify sender */ 122 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 123 int rtm_seq; /* for sender to identify action */ 124 int rtm_errno; /* why failed */ 125 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 126 int rtm_use; /* from rtentry */ 127 u_long rtm_inits; /* which metrics we are initializing */ 128 struct rt_metrics rtm_rmx; /* metrics themselves */ 129 }; 130 131 struct route_cb { 132 int ip_count; 133 int ns_count; 134 int iso_count; 135 int any_count; 136 }; 137 #define RTM_VERSION 2 /* Up the ante and ignore older versions */ 138 139 #define RTM_ADD 0x1 /* Add Route */ 140 #define RTM_DELETE 0x2 /* Delete Route */ 141 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 142 #define RTM_GET 0x4 /* Report Metrics */ 143 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 144 #define RTM_REDIRECT 0x6 /* Told to use different route */ 145 #define RTM_MISS 0x7 /* Lookup failed on this address */ 146 #define RTM_LOCK 0x8 /* fix specified metrics */ 147 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */ 148 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */ 149 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 150 151 #define RTV_MTU 0x1 /* init or lock _mtu */ 152 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 153 #define RTV_EXPIRE 0x4 /* init or lock _hopcount */ 154 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 155 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 156 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 157 #define RTV_RTT 0x40 /* init or lock _rtt */ 158 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 159 160 #define RTA_DST 0x1 /* destination sockaddr present */ 161 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 162 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 163 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 164 #define RTA_IFP 0x10 /* interface name sockaddr present */ 165 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 166 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 167 168 #ifdef KERNEL 169 struct route_cb route_cb; 170 #endif 171 172 #ifdef KERNEL 173 #define RTFREE(rt) \ 174 if ((rt)->rt_refcnt <= 1) \ 175 rtfree(rt); \ 176 else \ 177 (rt)->rt_refcnt--; 178 179 #ifdef GATEWAY 180 #define RTHASHSIZ 64 181 #else 182 #define RTHASHSIZ 8 183 #endif 184 #if (RTHASHSIZ & (RTHASHSIZ - 1)) == 0 185 #define RTHASHMOD(h) ((h) & (RTHASHSIZ - 1)) 186 #else 187 #define RTHASHMOD(h) ((h) % RTHASHSIZ) 188 #endif 189 struct mbuf *rthost[RTHASHSIZ]; 190 struct mbuf *rtnet[RTHASHSIZ]; 191 struct rtstat rtstat; 192 struct rtentry *rtalloc1(); 193 #endif 194