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5ff67f98 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
0eb85d71 KB |
3 | * All rights reserved. |
4 | * | |
5 | * Redistribution and use in source and binary forms are permitted | |
b8c620d6 KB |
6 | * provided that the above copyright notice and this paragraph are |
7 | * duplicated in all such forms and that any documentation, | |
8 | * advertising materials, and other materials related to such | |
9 | * distribution and use acknowledge that the software was developed | |
10 | * by the University of California, Berkeley. The name of the | |
11 | * University may not be used to endorse or promote products derived | |
12 | * from this software without specific prior written permission. | |
13 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR | |
14 | * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED | |
15 | * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE. | |
5ff67f98 DF |
16 | */ |
17 | ||
76a2200d | 18 | #ifndef lint |
b8c620d6 | 19 | static char sccsid[] = "@(#)inet.c 5.7 (Berkeley) %G%"; |
0eb85d71 | 20 | #endif /* not lint */ |
5ff67f98 | 21 | |
76a2200d MK |
22 | /* |
23 | * Temporarily, copy these routines from the kernel, | |
24 | * as we need to know about subnets. | |
25 | */ | |
26 | #include "defs.h" | |
27 | ||
d002aa8c MK |
28 | extern struct interface *ifnet; |
29 | ||
76a2200d | 30 | /* |
d002aa8c | 31 | * Formulate an Internet address from network + host. |
76a2200d MK |
32 | */ |
33 | struct in_addr | |
d002aa8c MK |
34 | inet_makeaddr(net, host) |
35 | u_long net, host; | |
76a2200d | 36 | { |
d002aa8c MK |
37 | register struct interface *ifp; |
38 | register u_long mask; | |
76a2200d MK |
39 | u_long addr; |
40 | ||
d002aa8c MK |
41 | if (IN_CLASSA(net)) |
42 | mask = IN_CLASSA_HOST; | |
43 | else if (IN_CLASSB(net)) | |
44 | mask = IN_CLASSB_HOST; | |
76a2200d | 45 | else |
d002aa8c MK |
46 | mask = IN_CLASSC_HOST; |
47 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
48 | if ((ifp->int_netmask & net) == ifp->int_net) { | |
49 | mask = ~ifp->int_subnetmask; | |
50 | break; | |
51 | } | |
52 | addr = net | (host & mask); | |
76a2200d MK |
53 | addr = htonl(addr); |
54 | return (*(struct in_addr *)&addr); | |
55 | } | |
56 | ||
57 | /* | |
58 | * Return the network number from an internet address. | |
59 | */ | |
60 | inet_netof(in) | |
61 | struct in_addr in; | |
62 | { | |
63 | register u_long i = ntohl(in.s_addr); | |
d002aa8c | 64 | register u_long net; |
e1fe8748 | 65 | register struct interface *ifp; |
76a2200d | 66 | |
d002aa8c MK |
67 | if (IN_CLASSA(i)) |
68 | net = i & IN_CLASSA_NET; | |
69 | else if (IN_CLASSB(i)) | |
70 | net = i & IN_CLASSB_NET; | |
71 | else | |
72 | net = i & IN_CLASSC_NET; | |
e1fe8748 MK |
73 | |
74 | /* | |
d002aa8c | 75 | * Check whether network is a subnet; |
e1fe8748 MK |
76 | * if so, return subnet number. |
77 | */ | |
d002aa8c MK |
78 | for (ifp = ifnet; ifp; ifp = ifp->int_next) |
79 | if ((ifp->int_netmask & net) == ifp->int_net) | |
80 | return (i & ifp->int_subnetmask); | |
e1fe8748 | 81 | return (net); |
76a2200d MK |
82 | } |
83 | ||
84 | /* | |
85 | * Return the host portion of an internet address. | |
86 | */ | |
87 | inet_lnaof(in) | |
88 | struct in_addr in; | |
89 | { | |
90 | register u_long i = ntohl(in.s_addr); | |
d002aa8c | 91 | register u_long net, host; |
e1fe8748 | 92 | register struct interface *ifp; |
76a2200d MK |
93 | |
94 | if (IN_CLASSA(i)) { | |
d002aa8c MK |
95 | net = i & IN_CLASSA_NET; |
96 | host = i & IN_CLASSA_HOST; | |
76a2200d | 97 | } else if (IN_CLASSB(i)) { |
d002aa8c MK |
98 | net = i & IN_CLASSB_NET; |
99 | host = i & IN_CLASSB_HOST; | |
76a2200d | 100 | } else { |
d002aa8c MK |
101 | net = i & IN_CLASSC_NET; |
102 | host = i & IN_CLASSC_HOST; | |
76a2200d | 103 | } |
76a2200d | 104 | |
e1fe8748 | 105 | /* |
d002aa8c | 106 | * Check whether network is a subnet; |
e1fe8748 MK |
107 | * if so, use the modified interpretation of `host'. |
108 | */ | |
d002aa8c MK |
109 | for (ifp = ifnet; ifp; ifp = ifp->int_next) |
110 | if ((ifp->int_netmask & net) == ifp->int_net) | |
111 | return (host &~ ifp->int_subnetmask); | |
e1fe8748 | 112 | return (host); |
76a2200d | 113 | } |
4fad5a6e MK |
114 | |
115 | /* | |
116 | * Return RTF_HOST if the address is | |
117 | * for an Internet host, RTF_SUBNET for a subnet, | |
118 | * 0 for a network. | |
119 | */ | |
120 | inet_rtflags(sin) | |
121 | struct sockaddr_in *sin; | |
122 | { | |
123 | register u_long i = ntohl(sin->sin_addr.s_addr); | |
124 | register u_long net, host; | |
125 | register struct interface *ifp; | |
126 | ||
127 | if (IN_CLASSA(i)) { | |
128 | net = i & IN_CLASSA_NET; | |
129 | host = i & IN_CLASSA_HOST; | |
130 | } else if (IN_CLASSB(i)) { | |
131 | net = i & IN_CLASSB_NET; | |
132 | host = i & IN_CLASSB_HOST; | |
133 | } else { | |
134 | net = i & IN_CLASSC_NET; | |
135 | host = i & IN_CLASSC_HOST; | |
136 | } | |
137 | ||
4fad5a6e MK |
138 | /* |
139 | * Check whether this network is subnetted; | |
140 | * if so, check whether this is a subnet or a host. | |
141 | */ | |
142 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
143 | if (net == ifp->int_net) { | |
97cb3618 MK |
144 | if (host &~ ifp->int_subnetmask) |
145 | return (RTF_HOST); | |
146 | else if (ifp->int_subnetmask != ifp->int_netmask) | |
4fad5a6e MK |
147 | return (RTF_SUBNET); |
148 | else | |
97cb3618 | 149 | return (0); /* network */ |
4fad5a6e | 150 | } |
97cb3618 MK |
151 | if (host == 0) |
152 | return (0); /* network */ | |
153 | else | |
154 | return (RTF_HOST); | |
4fad5a6e MK |
155 | } |
156 | ||
157 | /* | |
7892134c MK |
158 | * Return true if a route to subnet/host of route rt should be sent to dst. |
159 | * Send it only if dst is on the same logical network if not "internal", | |
160 | * otherwise only if the route is the "internal" route for the logical net. | |
4fad5a6e | 161 | */ |
7892134c | 162 | inet_sendroute(rt, dst) |
09069ad0 MK |
163 | struct rt_entry *rt; |
164 | struct sockaddr_in *dst; | |
4fad5a6e | 165 | { |
09069ad0 MK |
166 | register u_long r = |
167 | ntohl(((struct sockaddr_in *)&rt->rt_dst)->sin_addr.s_addr); | |
4fad5a6e MK |
168 | register u_long d = ntohl(dst->sin_addr.s_addr); |
169 | ||
09069ad0 MK |
170 | if (IN_CLASSA(r)) { |
171 | if ((r & IN_CLASSA_NET) == (d & IN_CLASSA_NET)) { | |
172 | if ((r & IN_CLASSA_HOST) == 0) | |
173 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 174 | return (1); |
09069ad0 | 175 | } |
97cb3618 MK |
176 | if (r & IN_CLASSA_HOST) |
177 | return (0); | |
178 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
09069ad0 MK |
179 | } else if (IN_CLASSB(r)) { |
180 | if ((r & IN_CLASSB_NET) == (d & IN_CLASSB_NET)) { | |
181 | if ((r & IN_CLASSB_HOST) == 0) | |
182 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 183 | return (1); |
09069ad0 | 184 | } |
97cb3618 MK |
185 | if (r & IN_CLASSB_HOST) |
186 | return (0); | |
187 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
4fad5a6e | 188 | } else { |
09069ad0 MK |
189 | if ((r & IN_CLASSC_NET) == (d & IN_CLASSC_NET)) { |
190 | if ((r & IN_CLASSC_HOST) == 0) | |
191 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 192 | return (1); |
09069ad0 | 193 | } |
97cb3618 MK |
194 | if (r & IN_CLASSC_HOST) |
195 | return (0); | |
196 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
4fad5a6e MK |
197 | } |
198 | } |