Commit | Line | Data |
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5ff67f98 DF |
1 | /* |
2 | * Copyright (c) 1983 Regents of the University of California. | |
3 | * All rights reserved. The Berkeley software License Agreement | |
4 | * specifies the terms and conditions for redistribution. | |
5 | */ | |
6 | ||
76a2200d | 7 | #ifndef lint |
4fad5a6e | 8 | static char sccsid[] = "@(#)inet.c 5.2 (Berkeley) %G%"; |
5ff67f98 DF |
9 | #endif not lint |
10 | ||
76a2200d MK |
11 | /* |
12 | * Temporarily, copy these routines from the kernel, | |
13 | * as we need to know about subnets. | |
14 | */ | |
15 | #include "defs.h" | |
16 | ||
d002aa8c MK |
17 | extern struct interface *ifnet; |
18 | ||
76a2200d | 19 | /* |
d002aa8c | 20 | * Formulate an Internet address from network + host. |
76a2200d MK |
21 | */ |
22 | struct in_addr | |
d002aa8c MK |
23 | inet_makeaddr(net, host) |
24 | u_long net, host; | |
76a2200d | 25 | { |
d002aa8c MK |
26 | register struct interface *ifp; |
27 | register u_long mask; | |
76a2200d MK |
28 | u_long addr; |
29 | ||
d002aa8c MK |
30 | if (IN_CLASSA(net)) |
31 | mask = IN_CLASSA_HOST; | |
32 | else if (IN_CLASSB(net)) | |
33 | mask = IN_CLASSB_HOST; | |
76a2200d | 34 | else |
d002aa8c MK |
35 | mask = IN_CLASSC_HOST; |
36 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
37 | if ((ifp->int_netmask & net) == ifp->int_net) { | |
38 | mask = ~ifp->int_subnetmask; | |
39 | break; | |
40 | } | |
41 | addr = net | (host & mask); | |
76a2200d MK |
42 | addr = htonl(addr); |
43 | return (*(struct in_addr *)&addr); | |
44 | } | |
45 | ||
46 | /* | |
47 | * Return the network number from an internet address. | |
48 | */ | |
49 | inet_netof(in) | |
50 | struct in_addr in; | |
51 | { | |
52 | register u_long i = ntohl(in.s_addr); | |
d002aa8c | 53 | register u_long net; |
e1fe8748 | 54 | register struct interface *ifp; |
76a2200d | 55 | |
d002aa8c MK |
56 | if (IN_CLASSA(i)) |
57 | net = i & IN_CLASSA_NET; | |
58 | else if (IN_CLASSB(i)) | |
59 | net = i & IN_CLASSB_NET; | |
60 | else | |
61 | net = i & IN_CLASSC_NET; | |
e1fe8748 MK |
62 | |
63 | /* | |
d002aa8c | 64 | * Check whether network is a subnet; |
e1fe8748 MK |
65 | * if so, return subnet number. |
66 | */ | |
d002aa8c MK |
67 | for (ifp = ifnet; ifp; ifp = ifp->int_next) |
68 | if ((ifp->int_netmask & net) == ifp->int_net) | |
69 | return (i & ifp->int_subnetmask); | |
e1fe8748 | 70 | return (net); |
76a2200d MK |
71 | } |
72 | ||
73 | /* | |
74 | * Return the host portion of an internet address. | |
75 | */ | |
76 | inet_lnaof(in) | |
77 | struct in_addr in; | |
78 | { | |
79 | register u_long i = ntohl(in.s_addr); | |
d002aa8c | 80 | register u_long net, host; |
e1fe8748 | 81 | register struct interface *ifp; |
76a2200d MK |
82 | |
83 | if (IN_CLASSA(i)) { | |
d002aa8c MK |
84 | net = i & IN_CLASSA_NET; |
85 | host = i & IN_CLASSA_HOST; | |
76a2200d | 86 | } else if (IN_CLASSB(i)) { |
d002aa8c MK |
87 | net = i & IN_CLASSB_NET; |
88 | host = i & IN_CLASSB_HOST; | |
76a2200d | 89 | } else { |
d002aa8c MK |
90 | net = i & IN_CLASSC_NET; |
91 | host = i & IN_CLASSC_HOST; | |
76a2200d | 92 | } |
76a2200d | 93 | |
e1fe8748 | 94 | /* |
d002aa8c | 95 | * Check whether network is a subnet; |
e1fe8748 MK |
96 | * if so, use the modified interpretation of `host'. |
97 | */ | |
d002aa8c MK |
98 | for (ifp = ifnet; ifp; ifp = ifp->int_next) |
99 | if ((ifp->int_netmask & net) == ifp->int_net) | |
100 | return (host &~ ifp->int_subnetmask); | |
e1fe8748 | 101 | return (host); |
76a2200d | 102 | } |
4fad5a6e MK |
103 | |
104 | /* | |
105 | * Return RTF_HOST if the address is | |
106 | * for an Internet host, RTF_SUBNET for a subnet, | |
107 | * 0 for a network. | |
108 | */ | |
109 | inet_rtflags(sin) | |
110 | struct sockaddr_in *sin; | |
111 | { | |
112 | register u_long i = ntohl(sin->sin_addr.s_addr); | |
113 | register u_long net, host; | |
114 | register struct interface *ifp; | |
115 | ||
116 | if (IN_CLASSA(i)) { | |
117 | net = i & IN_CLASSA_NET; | |
118 | host = i & IN_CLASSA_HOST; | |
119 | } else if (IN_CLASSB(i)) { | |
120 | net = i & IN_CLASSB_NET; | |
121 | host = i & IN_CLASSB_HOST; | |
122 | } else { | |
123 | net = i & IN_CLASSC_NET; | |
124 | host = i & IN_CLASSC_HOST; | |
125 | } | |
126 | ||
127 | if (host == 0) | |
128 | return (0); /* network */ | |
129 | /* | |
130 | * Check whether this network is subnetted; | |
131 | * if so, check whether this is a subnet or a host. | |
132 | */ | |
133 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
134 | if (net == ifp->int_net) { | |
135 | if ((host &~ ifp->int_subnetmask) == 0) | |
136 | return (RTF_SUBNET); | |
137 | else | |
138 | return (RTF_HOST); | |
139 | } | |
140 | return (RTF_HOST); | |
141 | } | |
142 | ||
143 | /* | |
144 | * Return true if a route to subnet rtsin should be sent to dst. | |
145 | * Send it only if dst is on the same logical network, | |
146 | * or the route turns out to be for the net (aka subnet 0). | |
147 | */ | |
148 | inet_sendsubnet(rtsin, dst) | |
149 | struct sockaddr_in *rtsin, *dst; | |
150 | { | |
151 | register u_long rt = ntohl(rtsin->sin_addr.s_addr); | |
152 | register u_long d = ntohl(dst->sin_addr.s_addr); | |
153 | ||
154 | if (IN_CLASSA(rt)) { | |
155 | if ((rt & IN_CLASSA_HOST) == 0) | |
156 | return (1); | |
157 | return ((rt & IN_CLASSA_NET) == (d & IN_CLASSA_NET)); | |
158 | } else if (IN_CLASSB(rt)) { | |
159 | if ((rt & IN_CLASSB_HOST) == 0) | |
160 | return (1); | |
161 | return ((rt & IN_CLASSB_NET) == (d & IN_CLASSB_NET)); | |
162 | } else { | |
163 | if ((rt & IN_CLASSC_HOST) == 0) | |
164 | return (1); | |
165 | return ((rt & IN_CLASSC_NET) == (d & IN_CLASSC_NET)); | |
166 | } | |
167 | } |