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 |
97cb3618 | 8 | static char sccsid[] = "@(#)inet.c 5.4 (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 | ||
4fad5a6e MK |
127 | /* |
128 | * Check whether this network is subnetted; | |
129 | * if so, check whether this is a subnet or a host. | |
130 | */ | |
131 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
132 | if (net == ifp->int_net) { | |
97cb3618 MK |
133 | if (host &~ ifp->int_subnetmask) |
134 | return (RTF_HOST); | |
135 | else if (ifp->int_subnetmask != ifp->int_netmask) | |
4fad5a6e MK |
136 | return (RTF_SUBNET); |
137 | else | |
97cb3618 | 138 | return (0); /* network */ |
4fad5a6e | 139 | } |
97cb3618 MK |
140 | if (host == 0) |
141 | return (0); /* network */ | |
142 | else | |
143 | return (RTF_HOST); | |
4fad5a6e MK |
144 | } |
145 | ||
146 | /* | |
97cb3618 | 147 | * Return true if a route to subnet of route rt should be sent to dst. |
4fad5a6e | 148 | * Send it only if dst is on the same logical network, |
97cb3618 | 149 | * or the route is the "internal" route for the net. |
4fad5a6e | 150 | */ |
09069ad0 MK |
151 | inet_sendsubnet(rt, dst) |
152 | struct rt_entry *rt; | |
153 | struct sockaddr_in *dst; | |
4fad5a6e | 154 | { |
09069ad0 MK |
155 | register u_long r = |
156 | ntohl(((struct sockaddr_in *)&rt->rt_dst)->sin_addr.s_addr); | |
4fad5a6e MK |
157 | register u_long d = ntohl(dst->sin_addr.s_addr); |
158 | ||
09069ad0 MK |
159 | if (IN_CLASSA(r)) { |
160 | if ((r & IN_CLASSA_NET) == (d & IN_CLASSA_NET)) { | |
161 | if ((r & IN_CLASSA_HOST) == 0) | |
162 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 163 | return (1); |
09069ad0 | 164 | } |
97cb3618 MK |
165 | if (r & IN_CLASSA_HOST) |
166 | return (0); | |
167 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
09069ad0 MK |
168 | } else if (IN_CLASSB(r)) { |
169 | if ((r & IN_CLASSB_NET) == (d & IN_CLASSB_NET)) { | |
170 | if ((r & IN_CLASSB_HOST) == 0) | |
171 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 172 | return (1); |
09069ad0 | 173 | } |
97cb3618 MK |
174 | if (r & IN_CLASSB_HOST) |
175 | return (0); | |
176 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
4fad5a6e | 177 | } else { |
09069ad0 MK |
178 | if ((r & IN_CLASSC_NET) == (d & IN_CLASSC_NET)) { |
179 | if ((r & IN_CLASSC_HOST) == 0) | |
180 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 181 | return (1); |
09069ad0 | 182 | } |
97cb3618 MK |
183 | if (r & IN_CLASSC_HOST) |
184 | return (0); | |
185 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
4fad5a6e MK |
186 | } |
187 | } |