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b688fc87 WJ |
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 |