Commit | Line | Data |
---|---|---|
5ff67f98 | 1 | /* |
b2d6cd51 KB |
2 | * Copyright (c) 1983, 1993 |
3 | * The Regents of the University of California. All rights reserved. | |
0eb85d71 | 4 | * |
d60d530a | 5 | * %sccs.include.redist.c% |
5ff67f98 DF |
6 | */ |
7 | ||
76a2200d | 8 | #ifndef lint |
b2d6cd51 | 9 | static char sccsid[] = "@(#)inet.c 8.1 (Berkeley) %G%"; |
0eb85d71 | 10 | #endif /* not lint */ |
5ff67f98 | 11 | |
76a2200d MK |
12 | /* |
13 | * Temporarily, copy these routines from the kernel, | |
14 | * as we need to know about subnets. | |
15 | */ | |
16 | #include "defs.h" | |
17 | ||
d002aa8c MK |
18 | extern struct interface *ifnet; |
19 | ||
76a2200d | 20 | /* |
d002aa8c | 21 | * Formulate an Internet address from network + host. |
76a2200d MK |
22 | */ |
23 | struct in_addr | |
d002aa8c MK |
24 | inet_makeaddr(net, host) |
25 | u_long net, host; | |
76a2200d | 26 | { |
d002aa8c MK |
27 | register struct interface *ifp; |
28 | register u_long mask; | |
76a2200d MK |
29 | u_long addr; |
30 | ||
d002aa8c MK |
31 | if (IN_CLASSA(net)) |
32 | mask = IN_CLASSA_HOST; | |
33 | else if (IN_CLASSB(net)) | |
34 | mask = IN_CLASSB_HOST; | |
76a2200d | 35 | else |
d002aa8c MK |
36 | mask = IN_CLASSC_HOST; |
37 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
38 | if ((ifp->int_netmask & net) == ifp->int_net) { | |
39 | mask = ~ifp->int_subnetmask; | |
40 | break; | |
41 | } | |
42 | addr = net | (host & mask); | |
76a2200d MK |
43 | addr = htonl(addr); |
44 | return (*(struct in_addr *)&addr); | |
45 | } | |
46 | ||
47 | /* | |
48 | * Return the network number from an internet address. | |
49 | */ | |
50 | inet_netof(in) | |
51 | struct in_addr in; | |
52 | { | |
53 | register u_long i = ntohl(in.s_addr); | |
d002aa8c | 54 | register u_long net; |
e1fe8748 | 55 | register struct interface *ifp; |
76a2200d | 56 | |
d002aa8c MK |
57 | if (IN_CLASSA(i)) |
58 | net = i & IN_CLASSA_NET; | |
59 | else if (IN_CLASSB(i)) | |
60 | net = i & IN_CLASSB_NET; | |
61 | else | |
62 | net = i & IN_CLASSC_NET; | |
e1fe8748 MK |
63 | |
64 | /* | |
d002aa8c | 65 | * Check whether network is a subnet; |
e1fe8748 MK |
66 | * if so, return subnet number. |
67 | */ | |
d002aa8c MK |
68 | for (ifp = ifnet; ifp; ifp = ifp->int_next) |
69 | if ((ifp->int_netmask & net) == ifp->int_net) | |
70 | return (i & ifp->int_subnetmask); | |
e1fe8748 | 71 | return (net); |
76a2200d MK |
72 | } |
73 | ||
74 | /* | |
75 | * Return the host portion of an internet address. | |
76 | */ | |
77 | inet_lnaof(in) | |
78 | struct in_addr in; | |
79 | { | |
80 | register u_long i = ntohl(in.s_addr); | |
d002aa8c | 81 | register u_long net, host; |
e1fe8748 | 82 | register struct interface *ifp; |
76a2200d MK |
83 | |
84 | if (IN_CLASSA(i)) { | |
d002aa8c MK |
85 | net = i & IN_CLASSA_NET; |
86 | host = i & IN_CLASSA_HOST; | |
76a2200d | 87 | } else if (IN_CLASSB(i)) { |
d002aa8c MK |
88 | net = i & IN_CLASSB_NET; |
89 | host = i & IN_CLASSB_HOST; | |
76a2200d | 90 | } else { |
d002aa8c MK |
91 | net = i & IN_CLASSC_NET; |
92 | host = i & IN_CLASSC_HOST; | |
76a2200d | 93 | } |
76a2200d | 94 | |
e1fe8748 | 95 | /* |
d002aa8c | 96 | * Check whether network is a subnet; |
e1fe8748 MK |
97 | * if so, use the modified interpretation of `host'. |
98 | */ | |
d002aa8c MK |
99 | for (ifp = ifnet; ifp; ifp = ifp->int_next) |
100 | if ((ifp->int_netmask & net) == ifp->int_net) | |
101 | return (host &~ ifp->int_subnetmask); | |
e1fe8748 | 102 | return (host); |
76a2200d | 103 | } |
4fad5a6e | 104 | |
ad76aa05 KS |
105 | /* |
106 | * Return the netmask pertaining to an internet address. | |
107 | */ | |
108 | inet_maskof(in) | |
109 | struct in_addr in; | |
110 | { | |
111 | register u_long i = ntohl(in.s_addr); | |
112 | register u_long mask; | |
113 | register struct interface *ifp; | |
114 | ||
f9a25ff6 KS |
115 | if (i == 0) { |
116 | mask = 0; | |
117 | } else if (IN_CLASSA(i)) { | |
ad76aa05 KS |
118 | mask = IN_CLASSA_NET; |
119 | } else if (IN_CLASSB(i)) { | |
120 | mask = i & IN_CLASSB_NET; | |
121 | } else | |
122 | mask = i & IN_CLASSC_NET; | |
123 | ||
124 | /* | |
125 | * Check whether network is a subnet; | |
126 | * if so, use the modified interpretation of `host'. | |
127 | */ | |
128 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
129 | if ((ifp->int_netmask & i) == ifp->int_net) | |
130 | mask = ifp->int_subnetmask; | |
131 | return (htonl(mask)); | |
132 | } | |
133 | ||
4fad5a6e MK |
134 | /* |
135 | * Return RTF_HOST if the address is | |
136 | * for an Internet host, RTF_SUBNET for a subnet, | |
137 | * 0 for a network. | |
138 | */ | |
139 | inet_rtflags(sin) | |
140 | struct sockaddr_in *sin; | |
141 | { | |
142 | register u_long i = ntohl(sin->sin_addr.s_addr); | |
143 | register u_long net, host; | |
144 | register struct interface *ifp; | |
145 | ||
146 | if (IN_CLASSA(i)) { | |
147 | net = i & IN_CLASSA_NET; | |
148 | host = i & IN_CLASSA_HOST; | |
149 | } else if (IN_CLASSB(i)) { | |
150 | net = i & IN_CLASSB_NET; | |
151 | host = i & IN_CLASSB_HOST; | |
152 | } else { | |
153 | net = i & IN_CLASSC_NET; | |
154 | host = i & IN_CLASSC_HOST; | |
155 | } | |
156 | ||
4fad5a6e MK |
157 | /* |
158 | * Check whether this network is subnetted; | |
159 | * if so, check whether this is a subnet or a host. | |
160 | */ | |
161 | for (ifp = ifnet; ifp; ifp = ifp->int_next) | |
162 | if (net == ifp->int_net) { | |
97cb3618 MK |
163 | if (host &~ ifp->int_subnetmask) |
164 | return (RTF_HOST); | |
165 | else if (ifp->int_subnetmask != ifp->int_netmask) | |
4fad5a6e MK |
166 | return (RTF_SUBNET); |
167 | else | |
97cb3618 | 168 | return (0); /* network */ |
4fad5a6e | 169 | } |
97cb3618 MK |
170 | if (host == 0) |
171 | return (0); /* network */ | |
172 | else | |
173 | return (RTF_HOST); | |
4fad5a6e MK |
174 | } |
175 | ||
176 | /* | |
7892134c MK |
177 | * Return true if a route to subnet/host of route rt should be sent to dst. |
178 | * Send it only if dst is on the same logical network if not "internal", | |
179 | * otherwise only if the route is the "internal" route for the logical net. | |
4fad5a6e | 180 | */ |
7892134c | 181 | inet_sendroute(rt, dst) |
09069ad0 MK |
182 | struct rt_entry *rt; |
183 | struct sockaddr_in *dst; | |
4fad5a6e | 184 | { |
09069ad0 MK |
185 | register u_long r = |
186 | ntohl(((struct sockaddr_in *)&rt->rt_dst)->sin_addr.s_addr); | |
4fad5a6e MK |
187 | register u_long d = ntohl(dst->sin_addr.s_addr); |
188 | ||
09069ad0 MK |
189 | if (IN_CLASSA(r)) { |
190 | if ((r & IN_CLASSA_NET) == (d & IN_CLASSA_NET)) { | |
191 | if ((r & IN_CLASSA_HOST) == 0) | |
192 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 193 | return (1); |
09069ad0 | 194 | } |
97cb3618 MK |
195 | if (r & IN_CLASSA_HOST) |
196 | return (0); | |
197 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
09069ad0 MK |
198 | } else if (IN_CLASSB(r)) { |
199 | if ((r & IN_CLASSB_NET) == (d & IN_CLASSB_NET)) { | |
200 | if ((r & IN_CLASSB_HOST) == 0) | |
201 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 202 | return (1); |
09069ad0 | 203 | } |
97cb3618 MK |
204 | if (r & IN_CLASSB_HOST) |
205 | return (0); | |
206 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
4fad5a6e | 207 | } else { |
09069ad0 MK |
208 | if ((r & IN_CLASSC_NET) == (d & IN_CLASSC_NET)) { |
209 | if ((r & IN_CLASSC_HOST) == 0) | |
210 | return ((rt->rt_state & RTS_INTERNAL) == 0); | |
4fad5a6e | 211 | return (1); |
09069ad0 | 212 | } |
97cb3618 MK |
213 | if (r & IN_CLASSC_HOST) |
214 | return (0); | |
215 | return ((rt->rt_state & RTS_INTERNAL) != 0); | |
4fad5a6e MK |
216 | } |
217 | } |