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15637ed4 RG |
1 | /* |
2 | * Copyright (c) 1983 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 | ||
34 | #ifndef lint | |
35 | static char sccsid[] = "@(#)inet.c 5.8 (Berkeley) 6/1/90"; | |
36 | #endif /* not lint */ | |
37 | ||
38 | /* | |
39 | * Temporarily, copy these routines from the kernel, | |
40 | * as we need to know about subnets. | |
41 | */ | |
42 | #include "defs.h" | |
43 | ||
44 | extern struct interface *ifnet; | |
45 | ||
46 | /* | |
47 | * Formulate an Internet address from network + host. | |
48 | */ | |
49 | struct in_addr | |
50 | inet_makeaddr(net, host) | |
51 | u_long net, host; | |
52 | { | |
53 | register struct interface *ifp; | |
54 | register u_long mask; | |
55 | u_long addr; | |
56 | ||
57 | if (IN_CLASSA(net)) | |
58 | mask = IN_CLASSA_HOST; | |
59 | else if (IN_CLASSB(net)) | |
60 | mask = IN_CLASSB_HOST; | |
61 | else | |
62 | mask = IN_CLASSC_HOST; | |
63 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
64 | if ((ifp->int_netmask & net) == ifp->int_net) { | |
65 | mask = ~ifp->int_subnetmask; | |
66 | break; | |
67 | } | |
68 | addr = net | (host & mask); | |
69 | addr = htonl(addr); | |
70 | return (*(struct in_addr *)&addr); | |
71 | } | |
72 | ||
73 | /* | |
74 | * Return the network number from an internet address. | |
75 | */ | |
76 | inet_netof(in) | |
77 | struct in_addr in; | |
78 | { | |
79 | register u_long i = ntohl(in.s_addr); | |
80 | register u_long net; | |
81 | register struct interface *ifp; | |
82 | ||
83 | if (IN_CLASSA(i)) | |
84 | net = i & IN_CLASSA_NET; | |
85 | else if (IN_CLASSB(i)) | |
86 | net = i & IN_CLASSB_NET; | |
87 | else | |
88 | net = i & IN_CLASSC_NET; | |
89 | ||
90 | /* | |
91 | * Check whether network is a subnet; | |
92 | * if so, return subnet number. | |
93 | */ | |
94 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
95 | if ((ifp->int_netmask & net) == ifp->int_net) | |
96 | return (i & ifp->int_subnetmask); | |
97 | return (net); | |
98 | } | |
99 | ||
100 | /* | |
101 | * Return the host portion of an internet address. | |
102 | */ | |
103 | inet_lnaof(in) | |
104 | struct in_addr in; | |
105 | { | |
106 | register u_long i = ntohl(in.s_addr); | |
107 | register u_long net, host; | |
108 | register struct interface *ifp; | |
109 | ||
110 | if (IN_CLASSA(i)) { | |
111 | net = i & IN_CLASSA_NET; | |
112 | host = i & IN_CLASSA_HOST; | |
113 | } else if (IN_CLASSB(i)) { | |
114 | net = i & IN_CLASSB_NET; | |
115 | host = i & IN_CLASSB_HOST; | |
116 | } else { | |
117 | net = i & IN_CLASSC_NET; | |
118 | host = i & IN_CLASSC_HOST; | |
119 | } | |
120 | ||
121 | /* | |
122 | * Check whether network is a subnet; | |
123 | * if so, use the modified interpretation of `host'. | |
124 | */ | |
125 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
126 | if ((ifp->int_netmask & net) == ifp->int_net) | |
127 | return (host &~ ifp->int_subnetmask); | |
128 | return (host); | |
129 | } | |
130 | ||
131 | /* | |
132 | * Return RTF_HOST if the address is | |
133 | * for an Internet host, RTF_SUBNET for a subnet, | |
134 | * 0 for a network. | |
135 | */ | |
136 | inet_rtflags(sin) | |
137 | struct sockaddr_in *sin; | |
138 | { | |
139 | register u_long i = ntohl(sin->sin_addr.s_addr); | |
140 | register u_long net, host; | |
141 | register struct interface *ifp; | |
142 | ||
143 | if (IN_CLASSA(i)) { | |
144 | net = i & IN_CLASSA_NET; | |
145 | host = i & IN_CLASSA_HOST; | |
146 | } else if (IN_CLASSB(i)) { | |
147 | net = i & IN_CLASSB_NET; | |
148 | host = i & IN_CLASSB_HOST; | |
149 | } else { | |
150 | net = i & IN_CLASSC_NET; | |
151 | host = i & IN_CLASSC_HOST; | |
152 | } | |
153 | ||
154 | /* | |
155 | * Check whether this network is subnetted; | |
156 | * if so, check whether this is a subnet or a host. | |
157 | */ | |
158 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
159 | if (net == ifp->int_net) { | |
160 | if (host &~ ifp->int_subnetmask) | |
161 | return (RTF_HOST); | |
162 | else if (ifp->int_subnetmask != ifp->int_netmask) | |
163 | return (RTF_SUBNET); | |
164 | else | |
165 | return (0); /* network */ | |
166 | } | |
167 | if (host == 0) | |
168 | return (0); /* network */ | |
169 | else | |
170 | return (RTF_HOST); | |
171 | } | |
172 | ||
173 | /* | |
174 | * Return true if a route to subnet/host of route rt should be sent to dst. | |
175 | * Send it only if dst is on the same logical network if not "internal", | |
176 | * otherwise only if the route is the "internal" route for the logical net. | |
177 | */ | |
178 | inet_sendroute(rt, dst) | |
179 | struct rt_entry *rt; | |
180 | struct sockaddr_in *dst; | |
181 | { | |
182 | register u_long r = | |
183 | ntohl(((struct sockaddr_in *)&rt->rt_dst)->sin_addr.s_addr); | |
184 | register u_long d = ntohl(dst->sin_addr.s_addr); | |
185 | ||
186 | if (IN_CLASSA(r)) { | |
187 | if ((r & IN_CLASSA_NET) == (d & IN_CLASSA_NET)) { | |
188 | if ((r & IN_CLASSA_HOST) == 0) | |
189 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
190 | return (1); | |
191 | } | |
192 | if (r & IN_CLASSA_HOST) | |
193 | return (0); | |
194 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
195 | } else if (IN_CLASSB(r)) { | |
196 | if ((r & IN_CLASSB_NET) == (d & IN_CLASSB_NET)) { | |
197 | if ((r & IN_CLASSB_HOST) == 0) | |
198 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
199 | return (1); | |
200 | } | |
201 | if (r & IN_CLASSB_HOST) | |
202 | return (0); | |
203 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
204 | } else { | |
205 | if ((r & IN_CLASSC_NET) == (d & IN_CLASSC_NET)) { | |
206 | if ((r & IN_CLASSC_HOST) == 0) | |
207 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
208 | return (1); | |
209 | } | |
210 | if (r & IN_CLASSC_HOST) | |
211 | return (0); | |
212 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
213 | } | |
214 | } |