1 /* 2 * Copyright (c) 1980, 1986, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * %sccs.include.redist.c% 6 * 7 * @(#)route.h 8.3 (Berkeley) 04/19/94 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 u_long rmx_pksent; /* packets sent using this route */ 42 }; 43 44 /* 45 * rmx_rtt and rmx_rttvar are stored as microseconds; 46 * RTTTOPRHZ(rtt) converts to a value suitable for use 47 * by a protocol slowtimo counter. 48 */ 49 #define RTM_RTTUNIT 1000000 /* units for rtt, rttvar, as units per sec */ 50 #define RTTTOPRHZ(r) ((r) / (RTM_RTTUNIT / PR_SLOWHZ)) 51 52 /* 53 * We distinguish between routes to hosts and routes to networks, 54 * preferring the former if available. For each route we infer 55 * the interface to use from the gateway address supplied when 56 * the route was entered. Routes that forward packets through 57 * gateways are marked so that the output routines know to address the 58 * gateway rather than the ultimate destination. 59 */ 60 #ifndef RNF_NORMAL 61 #include <net/radix.h> 62 #endif 63 struct rtentry { 64 struct radix_node rt_nodes[2]; /* tree glue, and other values */ 65 #define rt_key(r) ((struct sockaddr *)((r)->rt_nodes->rn_key)) 66 #define rt_mask(r) ((struct sockaddr *)((r)->rt_nodes->rn_mask)) 67 struct sockaddr *rt_gateway; /* value */ 68 short rt_flags; /* up/down?, host/net */ 69 short rt_refcnt; /* # held references */ 70 u_long rt_use; /* raw # packets forwarded */ 71 struct ifnet *rt_ifp; /* the answer: interface to use */ 72 struct ifaddr *rt_ifa; /* the answer: interface to use */ 73 struct sockaddr *rt_genmask; /* for generation of cloned routes */ 74 caddr_t rt_llinfo; /* pointer to link level info cache */ 75 struct rt_metrics rt_rmx; /* metrics used by rx'ing protocols */ 76 struct rtentry *rt_gwroute; /* implied entry for gatewayed routes */ 77 }; 78 79 /* 80 * Following structure necessary for 4.3 compatibility; 81 * We should eventually move it to a compat file. 82 */ 83 struct ortentry { 84 u_long rt_hash; /* to speed lookups */ 85 struct sockaddr rt_dst; /* key */ 86 struct sockaddr rt_gateway; /* value */ 87 short rt_flags; /* up/down?, host/net */ 88 short rt_refcnt; /* # held references */ 89 u_long rt_use; /* raw # packets forwarded */ 90 struct ifnet *rt_ifp; /* the answer: interface to use */ 91 }; 92 93 #define RTF_UP 0x1 /* route usable */ 94 #define RTF_GATEWAY 0x2 /* destination is a gateway */ 95 #define RTF_HOST 0x4 /* host entry (net otherwise) */ 96 #define RTF_REJECT 0x8 /* host or net unreachable */ 97 #define RTF_DYNAMIC 0x10 /* created dynamically (by redirect) */ 98 #define RTF_MODIFIED 0x20 /* modified dynamically (by redirect) */ 99 #define RTF_DONE 0x40 /* message confirmed */ 100 #define RTF_MASK 0x80 /* subnet mask present */ 101 #define RTF_CLONING 0x100 /* generate new routes on use */ 102 #define RTF_XRESOLVE 0x200 /* external daemon resolves name */ 103 #define RTF_LLINFO 0x400 /* generated by ARP or ESIS */ 104 #define RTF_STATIC 0x800 /* manually added */ 105 #define RTF_BLACKHOLE 0x1000 /* just discard pkts (during updates) */ 106 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */ 107 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */ 108 109 110 /* 111 * Routing statistics. 112 */ 113 struct rtstat { 114 short rts_badredirect; /* bogus redirect calls */ 115 short rts_dynamic; /* routes created by redirects */ 116 short rts_newgateway; /* routes modified by redirects */ 117 short rts_unreach; /* lookups which failed */ 118 short rts_wildcard; /* lookups satisfied by a wildcard */ 119 }; 120 /* 121 * Structures for routing messages. 122 */ 123 struct rt_msghdr { 124 u_short rtm_msglen; /* to skip over non-understood messages */ 125 u_char rtm_version; /* future binary compatibility */ 126 u_char rtm_type; /* message type */ 127 u_short rtm_index; /* index for associated ifp */ 128 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 129 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 130 pid_t rtm_pid; /* identify sender */ 131 int rtm_seq; /* for sender to identify action */ 132 int rtm_errno; /* why failed */ 133 int rtm_use; /* from rtentry */ 134 u_long rtm_inits; /* which metrics we are initializing */ 135 struct rt_metrics rtm_rmx; /* metrics themselves */ 136 }; 137 138 #define RTM_VERSION 3 /* Up the ante and ignore older versions */ 139 140 #define RTM_ADD 0x1 /* Add Route */ 141 #define RTM_DELETE 0x2 /* Delete Route */ 142 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 143 #define RTM_GET 0x4 /* Report Metrics */ 144 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 145 #define RTM_REDIRECT 0x6 /* Told to use different route */ 146 #define RTM_MISS 0x7 /* Lookup failed on this address */ 147 #define RTM_LOCK 0x8 /* fix specified metrics */ 148 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */ 149 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */ 150 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 151 #define RTM_NEWADDR 0xc /* address being added to iface */ 152 #define RTM_DELADDR 0xd /* address being removed from iface */ 153 #define RTM_IFINFO 0xe /* iface going up/down etc. */ 154 155 #define RTV_MTU 0x1 /* init or lock _mtu */ 156 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 157 #define RTV_EXPIRE 0x4 /* init or lock _hopcount */ 158 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 159 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 160 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 161 #define RTV_RTT 0x40 /* init or lock _rtt */ 162 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 163 164 /* 165 * Bitmask values for rtm_addr. 166 */ 167 #define RTA_DST 0x1 /* destination sockaddr present */ 168 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 169 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 170 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 171 #define RTA_IFP 0x10 /* interface name sockaddr present */ 172 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 173 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 174 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */ 175 176 /* 177 * Index offsets for sockaddr array for alternate internal encoding. 178 */ 179 #define RTAX_DST 0 /* destination sockaddr present */ 180 #define RTAX_GATEWAY 1 /* gateway sockaddr present */ 181 #define RTAX_NETMASK 2 /* netmask sockaddr present */ 182 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */ 183 #define RTAX_IFP 4 /* interface name sockaddr present */ 184 #define RTAX_IFA 5 /* interface addr sockaddr present */ 185 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */ 186 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */ 187 #define RTAX_MAX 8 /* size of array to allocate */ 188 189 struct rt_addrinfo { 190 int rti_addrs; 191 struct sockaddr *rti_info[RTAX_MAX]; 192 }; 193 194 struct route_cb { 195 int ip_count; 196 int ns_count; 197 int iso_count; 198 int any_count; 199 }; 200 201 #ifdef KERNEL 202 #define RTFREE(rt) \ 203 if ((rt)->rt_refcnt <= 1) \ 204 rtfree(rt); \ 205 else \ 206 (rt)->rt_refcnt--; 207 208 struct route_cb route_cb; 209 struct rtstat rtstat; 210 struct radix_node_head *rt_tables[AF_MAX+1]; 211 212 void route_init __P((void)); 213 int route_output __P((struct mbuf *, struct socket *)); 214 int route_usrreq __P((struct socket *, 215 int, struct mbuf *, struct mbuf *, struct mbuf *)); 216 void rt_ifmsg __P((struct ifnet *)); 217 void rt_maskedcopy __P((struct sockaddr *, 218 struct sockaddr *, struct sockaddr *)); 219 void rt_missmsg __P((int, struct rt_addrinfo *, int, int)); 220 void rt_newaddrmsg __P((int, struct ifaddr *, int, struct rtentry *)); 221 int rt_setgate __P((struct rtentry *, 222 struct sockaddr *, struct sockaddr *)); 223 void rt_setmetrics __P((u_long, struct rt_metrics *, struct rt_metrics *)); 224 void rtable_init __P((void **)); 225 void rtalloc __P((struct route *)); 226 struct rtentry * 227 rtalloc1 __P((struct sockaddr *, int)); 228 void rtfree __P((struct rtentry *)); 229 int rtinit __P((struct ifaddr *, int, int)); 230 int rtioctl __P((int, caddr_t, struct proc *)); 231 int rtredirect __P((struct sockaddr *, struct sockaddr *, 232 struct sockaddr *, int, struct sockaddr *, struct rtentry **)); 233 int rtrequest __P((int, struct sockaddr *, 234 struct sockaddr *, struct sockaddr *, int, struct rtentry **)); 235 #endif 236