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 8.5.1.1 (Berkeley) 02/23/95 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_MULTICAST 0x2000 /* try joining uni/multicast routing */ 107 #define RTF_PROTO2 0x4000 /* protocol specific routing flag */ 108 #define RTF_PROTO1 0x8000 /* protocol specific routing flag */ 109 110 111 /* 112 * Routing statistics. 113 */ 114 struct rtstat { 115 short rts_badredirect; /* bogus redirect calls */ 116 short rts_dynamic; /* routes created by redirects */ 117 short rts_newgateway; /* routes modified by redirects */ 118 short rts_unreach; /* lookups which failed */ 119 short rts_wildcard; /* lookups satisfied by a wildcard */ 120 }; 121 /* 122 * Structures for routing messages. 123 */ 124 struct rt_msghdr { 125 u_short rtm_msglen; /* to skip over non-understood messages */ 126 u_char rtm_version; /* future binary compatibility */ 127 u_char rtm_type; /* message type */ 128 u_short rtm_index; /* index for associated ifp */ 129 int rtm_flags; /* flags, incl. kern & message, e.g. DONE */ 130 int rtm_addrs; /* bitmask identifying sockaddrs in msg */ 131 pid_t rtm_pid; /* identify sender */ 132 int rtm_seq; /* for sender to identify action */ 133 int rtm_errno; /* why failed */ 134 int rtm_use; /* from rtentry */ 135 u_long rtm_inits; /* which metrics we are initializing */ 136 struct rt_metrics rtm_rmx; /* metrics themselves */ 137 }; 138 139 #define RTM_VERSION 3 /* Up the ante and ignore older versions */ 140 141 #define RTM_ADD 0x1 /* Add Route */ 142 #define RTM_DELETE 0x2 /* Delete Route */ 143 #define RTM_CHANGE 0x3 /* Change Metrics or flags */ 144 #define RTM_GET 0x4 /* Report Metrics */ 145 #define RTM_LOSING 0x5 /* Kernel Suspects Partitioning */ 146 #define RTM_REDIRECT 0x6 /* Told to use different route */ 147 #define RTM_MISS 0x7 /* Lookup failed on this address */ 148 #define RTM_LOCK 0x8 /* fix specified metrics */ 149 #define RTM_OLDADD 0x9 /* caused by SIOCADDRT */ 150 #define RTM_OLDDEL 0xa /* caused by SIOCDELRT */ 151 #define RTM_RESOLVE 0xb /* req to resolve dst to LL addr */ 152 #define RTM_NEWADDR 0xc /* address being added to iface */ 153 #define RTM_DELADDR 0xd /* address being removed from iface */ 154 #define RTM_IFINFO 0xe /* iface going up/down etc. */ 155 #define RTM_ADDPKT 0xf /* Add Route based on entire packet hdr */ 156 #define RTM_DELPKT 0x10 /* Delete Route base on entire packet hdr */ 157 158 #define RTV_MTU 0x1 /* init or lock _mtu */ 159 #define RTV_HOPCOUNT 0x2 /* init or lock _hopcount */ 160 #define RTV_EXPIRE 0x4 /* init or lock _hopcount */ 161 #define RTV_RPIPE 0x8 /* init or lock _recvpipe */ 162 #define RTV_SPIPE 0x10 /* init or lock _sendpipe */ 163 #define RTV_SSTHRESH 0x20 /* init or lock _ssthresh */ 164 #define RTV_RTT 0x40 /* init or lock _rtt */ 165 #define RTV_RTTVAR 0x80 /* init or lock _rttvar */ 166 167 /* 168 * Bitmask values for rtm_addr. 169 */ 170 #define RTA_DST 0x1 /* destination sockaddr present */ 171 #define RTA_GATEWAY 0x2 /* gateway sockaddr present */ 172 #define RTA_NETMASK 0x4 /* netmask sockaddr present */ 173 #define RTA_GENMASK 0x8 /* cloning mask sockaddr present */ 174 #define RTA_IFP 0x10 /* interface name sockaddr present */ 175 #define RTA_IFA 0x20 /* interface addr sockaddr present */ 176 #define RTA_AUTHOR 0x40 /* sockaddr for author of redirect */ 177 #define RTA_BRD 0x80 /* for NEWADDR, broadcast or p-p dest addr */ 178 179 /* 180 * Index offsets for sockaddr array for alternate internal encoding. 181 */ 182 #define RTAX_DST 0 /* destination sockaddr present */ 183 #define RTAX_GATEWAY 1 /* gateway sockaddr present */ 184 #define RTAX_NETMASK 2 /* netmask sockaddr present */ 185 #define RTAX_GENMASK 3 /* cloning mask sockaddr present */ 186 #define RTAX_IFP 4 /* interface name sockaddr present */ 187 #define RTAX_IFA 5 /* interface addr sockaddr present */ 188 #define RTAX_AUTHOR 6 /* sockaddr for author of redirect */ 189 #define RTAX_BRD 7 /* for NEWADDR, broadcast or p-p dest addr */ 190 #define RTAX_MAX 8 /* size of array to allocate */ 191 192 struct rt_addrinfo { 193 int rti_addrs; 194 struct sockaddr *rti_info[RTAX_MAX]; 195 int rti_flags; 196 struct ifaddr *rti_ifa; 197 struct ifnet *rti_ifp; 198 struct rt_msghdr *rti_rtm; 199 caddr_t rti_pkthdr; 200 }; 201 202 struct route_cb { 203 int ip_count; 204 int ns_count; 205 int iso_count; 206 int any_count; 207 }; 208 209 #ifdef KERNEL 210 #define RTFREE(rt) \ 211 if ((rt)->rt_refcnt <= 1) \ 212 rtfree(rt); \ 213 else \ 214 (rt)->rt_refcnt--; 215 216 struct route_cb route_cb; 217 struct rtstat rtstat; 218 struct radix_node_head *rt_tables[AF_MAX+1]; 219 220 struct socket; 221 222 void route_init __P((void)); 223 int route_output __P((struct mbuf *, struct socket *)); 224 int route_usrreq __P((struct socket *, 225 int, struct mbuf *, struct mbuf *, struct mbuf *)); 226 void rt_ifmsg __P((struct ifnet *)); 227 void rt_maskedcopy __P((struct sockaddr *, 228 struct sockaddr *, struct sockaddr *)); 229 void rt_missmsg __P((int, struct rt_addrinfo *, int, int)); 230 void rt_newaddrmsg __P((int, struct ifaddr *, int, struct rtentry *)); 231 int rt_setgate __P((struct rtentry *, 232 struct sockaddr *, struct sockaddr *)); 233 void rt_setmetrics __P((u_long, struct rt_metrics *, struct rt_metrics *)); 234 void rtable_init __P((void **)); 235 void rtalloc __P((struct route *)); 236 struct rtentry * 237 rtalloc1 __P((struct sockaddr *, int)); 238 void rtfree __P((struct rtentry *)); 239 int rtinit __P((struct ifaddr *, int, int)); 240 int rtioctl __P((u_long, caddr_t, struct proc *)); 241 int rtredirect __P((struct sockaddr *, struct sockaddr *, 242 struct sockaddr *, int, struct sockaddr *, struct rtentry **)); 243 int rtrequest __P((int, struct sockaddr *, 244 struct sockaddr *, struct sockaddr *, int, struct rtentry **)); 245 int rtrequest1 __P((int, struct rt_addrinfo *, struct rtentry **)); 246 #endif 247