Commit | Line | Data |
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8ae0e4b4 | 1 | /* |
0880b18e | 2 | * Copyright (c) 1982, 1986 Regents of the University of California. |
2b6b6284 | 3 | * All rights reserved. |
8ae0e4b4 | 4 | * |
2b6b6284 | 5 | * Redistribution and use in source and binary forms are permitted |
616d42db 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. | |
2b6b6284 | 16 | * |
616d42db | 17 | * @(#)in.c 7.9 (Berkeley) %G% |
8ae0e4b4 | 18 | */ |
8473bbab | 19 | |
20666ad3 | 20 | #include "param.h" |
65b95551 | 21 | #include "ioctl.h" |
20666ad3 JB |
22 | #include "mbuf.h" |
23 | #include "protosw.h" | |
24 | #include "socket.h" | |
25 | #include "socketvar.h" | |
65b95551 MK |
26 | #include "uio.h" |
27 | #include "dir.h" | |
28 | #include "user.h" | |
20666ad3 | 29 | #include "in_systm.h" |
6187f8f4 SL |
30 | #include "../net/if.h" |
31 | #include "../net/route.h" | |
8473bbab | 32 | #include "../net/af.h" |
65b95551 MK |
33 | #include "in.h" |
34 | #include "in_var.h" | |
8473bbab SL |
35 | |
36 | #ifdef INET | |
37 | inet_hash(sin, hp) | |
38 | register struct sockaddr_in *sin; | |
39 | struct afhash *hp; | |
40 | { | |
65b95551 | 41 | register u_long n; |
a8d3bf7f | 42 | |
65b95551 MK |
43 | n = in_netof(sin->sin_addr); |
44 | if (n) | |
45 | while ((n & 0xff) == 0) | |
46 | n >>= 8; | |
47 | hp->afh_nethash = n; | |
2c48b3f8 | 48 | hp->afh_hosthash = ntohl(sin->sin_addr.s_addr); |
8473bbab SL |
49 | } |
50 | ||
51 | inet_netmatch(sin1, sin2) | |
52 | struct sockaddr_in *sin1, *sin2; | |
53 | { | |
a8d3bf7f | 54 | |
6f117122 | 55 | return (in_netof(sin1->sin_addr) == in_netof(sin2->sin_addr)); |
8473bbab SL |
56 | } |
57 | ||
58 | /* | |
65b95551 | 59 | * Formulate an Internet address from network + host. |
8473bbab SL |
60 | */ |
61 | struct in_addr | |
65b95551 MK |
62 | in_makeaddr(net, host) |
63 | u_long net, host; | |
8473bbab | 64 | { |
65b95551 MK |
65 | register struct in_ifaddr *ia; |
66 | register u_long mask; | |
8473bbab SL |
67 | u_long addr; |
68 | ||
65b95551 MK |
69 | if (IN_CLASSA(net)) |
70 | mask = IN_CLASSA_HOST; | |
71 | else if (IN_CLASSB(net)) | |
72 | mask = IN_CLASSB_HOST; | |
8473bbab | 73 | else |
65b95551 MK |
74 | mask = IN_CLASSC_HOST; |
75 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
76 | if ((ia->ia_netmask & net) == ia->ia_net) { | |
77 | mask = ~ia->ia_subnetmask; | |
78 | break; | |
79 | } | |
80 | addr = htonl(net | (host & mask)); | |
8473bbab SL |
81 | return (*(struct in_addr *)&addr); |
82 | } | |
83 | ||
84 | /* | |
a8d3bf7f | 85 | * Return the network number from an internet address. |
8473bbab | 86 | */ |
2dd77a90 | 87 | u_long |
8473bbab SL |
88 | in_netof(in) |
89 | struct in_addr in; | |
90 | { | |
2c48b3f8 | 91 | register u_long i = ntohl(in.s_addr); |
65b95551 MK |
92 | register u_long net; |
93 | register struct in_ifaddr *ia; | |
8473bbab | 94 | |
65b95551 MK |
95 | if (IN_CLASSA(i)) |
96 | net = i & IN_CLASSA_NET; | |
97 | else if (IN_CLASSB(i)) | |
98 | net = i & IN_CLASSB_NET; | |
b4f9e9c7 | 99 | else if (IN_CLASSC(i)) |
65b95551 | 100 | net = i & IN_CLASSC_NET; |
b4f9e9c7 MK |
101 | else |
102 | return (0); | |
083b2954 MK |
103 | |
104 | /* | |
65b95551 | 105 | * Check whether network is a subnet; |
083b2954 MK |
106 | * if so, return subnet number. |
107 | */ | |
65b95551 | 108 | for (ia = in_ifaddr; ia; ia = ia->ia_next) |
2dd77a90 | 109 | if (net == ia->ia_net) |
65b95551 | 110 | return (i & ia->ia_subnetmask); |
083b2954 | 111 | return (net); |
8473bbab SL |
112 | } |
113 | ||
114 | /* | |
a8d3bf7f | 115 | * Return the host portion of an internet address. |
8473bbab | 116 | */ |
8011f5df | 117 | u_long |
8473bbab SL |
118 | in_lnaof(in) |
119 | struct in_addr in; | |
120 | { | |
2c48b3f8 | 121 | register u_long i = ntohl(in.s_addr); |
65b95551 MK |
122 | register u_long net, host; |
123 | register struct in_ifaddr *ia; | |
8473bbab | 124 | |
3adde5ac | 125 | if (IN_CLASSA(i)) { |
65b95551 MK |
126 | net = i & IN_CLASSA_NET; |
127 | host = i & IN_CLASSA_HOST; | |
3adde5ac | 128 | } else if (IN_CLASSB(i)) { |
65b95551 MK |
129 | net = i & IN_CLASSB_NET; |
130 | host = i & IN_CLASSB_HOST; | |
b4f9e9c7 | 131 | } else if (IN_CLASSC(i)) { |
65b95551 MK |
132 | net = i & IN_CLASSC_NET; |
133 | host = i & IN_CLASSC_HOST; | |
b4f9e9c7 MK |
134 | } else |
135 | return (i); | |
3adde5ac | 136 | |
083b2954 | 137 | /* |
65b95551 | 138 | * Check whether network is a subnet; |
083b2954 MK |
139 | * if so, use the modified interpretation of `host'. |
140 | */ | |
65b95551 | 141 | for (ia = in_ifaddr; ia; ia = ia->ia_next) |
2dd77a90 | 142 | if (net == ia->ia_net) |
65b95551 | 143 | return (host &~ ia->ia_subnetmask); |
083b2954 | 144 | return (host); |
8473bbab SL |
145 | } |
146 | ||
8011f5df MK |
147 | #ifndef SUBNETSARELOCAL |
148 | #define SUBNETSARELOCAL 1 | |
149 | #endif | |
150 | int subnetsarelocal = SUBNETSARELOCAL; | |
99578149 | 151 | /* |
65b95551 | 152 | * Return 1 if an internet address is for a ``local'' host |
8011f5df MK |
153 | * (one to which we have a connection). If subnetsarelocal |
154 | * is true, this includes other subnets of the local net. | |
155 | * Otherwise, it includes only the directly-connected (sub)nets. | |
99578149 MK |
156 | */ |
157 | in_localaddr(in) | |
158 | struct in_addr in; | |
159 | { | |
160 | register u_long i = ntohl(in.s_addr); | |
65b95551 | 161 | register struct in_ifaddr *ia; |
99578149 | 162 | |
16cae8d5 MK |
163 | if (subnetsarelocal) { |
164 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
165 | if ((i & ia->ia_netmask) == ia->ia_net) | |
166 | return (1); | |
167 | } else { | |
168 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
169 | if ((i & ia->ia_subnetmask) == ia->ia_subnet) | |
170 | return (1); | |
171 | } | |
65b95551 MK |
172 | return (0); |
173 | } | |
174 | ||
b4f9e9c7 MK |
175 | /* |
176 | * Determine whether an IP address is in a reserved set of addresses | |
177 | * that may not be forwarded, or whether datagrams to that destination | |
178 | * may be forwarded. | |
179 | */ | |
180 | in_canforward(in) | |
181 | struct in_addr in; | |
182 | { | |
183 | register u_long i = ntohl(in.s_addr); | |
184 | register u_long net; | |
185 | ||
186 | if (IN_EXPERIMENTAL(i)) | |
187 | return (0); | |
188 | if (IN_CLASSA(i)) { | |
189 | net = i & IN_CLASSA_NET; | |
190 | if (net == 0 || net == IN_LOOPBACKNET) | |
191 | return (0); | |
192 | } | |
193 | return (1); | |
194 | } | |
195 | ||
2dd77a90 MK |
196 | int in_interfaces; /* number of external internet interfaces */ |
197 | extern struct ifnet loif; | |
198 | ||
65b95551 MK |
199 | /* |
200 | * Generic internet control operations (ioctl's). | |
201 | * Ifp is 0 if not an interface-specific ioctl. | |
202 | */ | |
2dd77a90 | 203 | /* ARGSUSED */ |
65b95551 MK |
204 | in_control(so, cmd, data, ifp) |
205 | struct socket *so; | |
206 | int cmd; | |
207 | caddr_t data; | |
208 | register struct ifnet *ifp; | |
209 | { | |
210 | register struct ifreq *ifr = (struct ifreq *)data; | |
211 | register struct in_ifaddr *ia = 0; | |
212 | struct ifaddr *ifa; | |
213 | struct mbuf *m; | |
214 | int error; | |
215 | ||
216 | /* | |
217 | * Find address for this interface, if it exists. | |
218 | */ | |
219 | if (ifp) | |
220 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
221 | if (ia->ia_ifp == ifp) | |
222 | break; | |
223 | ||
224 | switch (cmd) { | |
225 | ||
65b95551 | 226 | case SIOCSIFADDR: |
65b95551 | 227 | case SIOCSIFNETMASK: |
0977715b | 228 | case SIOCSIFDSTADDR: |
65b95551 MK |
229 | if (!suser()) |
230 | return (u.u_error); | |
231 | ||
232 | if (ifp == 0) | |
233 | panic("in_control"); | |
234 | if (ia == (struct in_ifaddr *)0) { | |
235 | m = m_getclr(M_WAIT, MT_IFADDR); | |
236 | if (m == (struct mbuf *)NULL) | |
237 | return (ENOBUFS); | |
238 | if (ia = in_ifaddr) { | |
239 | for ( ; ia->ia_next; ia = ia->ia_next) | |
240 | ; | |
241 | ia->ia_next = mtod(m, struct in_ifaddr *); | |
242 | } else | |
243 | in_ifaddr = mtod(m, struct in_ifaddr *); | |
244 | ia = mtod(m, struct in_ifaddr *); | |
245 | if (ifa = ifp->if_addrlist) { | |
246 | for ( ; ifa->ifa_next; ifa = ifa->ifa_next) | |
247 | ; | |
248 | ifa->ifa_next = (struct ifaddr *) ia; | |
249 | } else | |
250 | ifp->if_addrlist = (struct ifaddr *) ia; | |
251 | ia->ia_ifp = ifp; | |
252 | IA_SIN(ia)->sin_family = AF_INET; | |
2dd77a90 MK |
253 | if (ifp != &loif) |
254 | in_interfaces++; | |
99578149 | 255 | } |
65b95551 | 256 | break; |
b9ce6c7a MK |
257 | |
258 | case SIOCSIFBRDADDR: | |
b9ce6c7a MK |
259 | if (!suser()) |
260 | return (u.u_error); | |
261 | /* FALLTHROUGH */ | |
262 | ||
263 | default: | |
264 | if (ia == (struct in_ifaddr *)0) | |
265 | return (EADDRNOTAVAIL); | |
266 | break; | |
65b95551 MK |
267 | } |
268 | ||
269 | switch (cmd) { | |
270 | ||
271 | case SIOCGIFADDR: | |
272 | ifr->ifr_addr = ia->ia_addr; | |
273 | break; | |
274 | ||
275 | case SIOCGIFBRDADDR: | |
276 | if ((ifp->if_flags & IFF_BROADCAST) == 0) | |
277 | return (EINVAL); | |
278 | ifr->ifr_dstaddr = ia->ia_broadaddr; | |
279 | break; | |
280 | ||
281 | case SIOCGIFDSTADDR: | |
282 | if ((ifp->if_flags & IFF_POINTOPOINT) == 0) | |
283 | return (EINVAL); | |
284 | ifr->ifr_dstaddr = ia->ia_dstaddr; | |
285 | break; | |
286 | ||
287 | case SIOCGIFNETMASK: | |
288 | #define satosin(sa) ((struct sockaddr_in *)(sa)) | |
289 | satosin(&ifr->ifr_addr)->sin_family = AF_INET; | |
290 | satosin(&ifr->ifr_addr)->sin_addr.s_addr = htonl(ia->ia_subnetmask); | |
291 | break; | |
292 | ||
293 | case SIOCSIFDSTADDR: | |
2c83bd95 MK |
294 | { |
295 | struct sockaddr oldaddr; | |
296 | ||
65b95551 MK |
297 | if ((ifp->if_flags & IFF_POINTOPOINT) == 0) |
298 | return (EINVAL); | |
2c83bd95 MK |
299 | oldaddr = ia->ia_dstaddr; |
300 | ia->ia_dstaddr = ifr->ifr_dstaddr; | |
65b95551 | 301 | if (ifp->if_ioctl && |
2c83bd95 MK |
302 | (error = (*ifp->if_ioctl)(ifp, SIOCSIFDSTADDR, ia))) { |
303 | ia->ia_dstaddr = oldaddr; | |
65b95551 | 304 | return (error); |
2c83bd95 MK |
305 | } |
306 | if (ia->ia_flags & IFA_ROUTE) { | |
307 | rtinit(&oldaddr, &ia->ia_addr, (int)SIOCDELRT, | |
308 | RTF_HOST); | |
309 | rtinit(&ia->ia_dstaddr, &ia->ia_addr, (int)SIOCADDRT, | |
310 | RTF_HOST|RTF_UP); | |
311 | } | |
312 | } | |
65b95551 MK |
313 | break; |
314 | ||
315 | case SIOCSIFBRDADDR: | |
316 | if ((ifp->if_flags & IFF_BROADCAST) == 0) | |
317 | return (EINVAL); | |
318 | ia->ia_broadaddr = ifr->ifr_broadaddr; | |
319 | break; | |
320 | ||
321 | case SIOCSIFADDR: | |
9340d736 MK |
322 | return (in_ifinit(ifp, ia, |
323 | (struct sockaddr_in *) &ifr->ifr_addr)); | |
65b95551 MK |
324 | |
325 | case SIOCSIFNETMASK: | |
326 | ia->ia_subnetmask = ntohl(satosin(&ifr->ifr_addr)->sin_addr.s_addr); | |
327 | break; | |
328 | ||
329 | default: | |
330 | if (ifp == 0 || ifp->if_ioctl == 0) | |
331 | return (EOPNOTSUPP); | |
332 | return ((*ifp->if_ioctl)(ifp, cmd, data)); | |
99578149 MK |
333 | } |
334 | return (0); | |
335 | } | |
336 | ||
8473bbab | 337 | /* |
65b95551 MK |
338 | * Initialize an interface's internet address |
339 | * and routing table entry. | |
8473bbab | 340 | */ |
65b95551 | 341 | in_ifinit(ifp, ia, sin) |
8473bbab | 342 | register struct ifnet *ifp; |
65b95551 MK |
343 | register struct in_ifaddr *ia; |
344 | struct sockaddr_in *sin; | |
345 | { | |
346 | register u_long i = ntohl(sin->sin_addr.s_addr); | |
2c83bd95 MK |
347 | struct sockaddr oldaddr; |
348 | struct sockaddr_in netaddr; | |
65b95551 MK |
349 | int s = splimp(), error; |
350 | ||
2c83bd95 | 351 | oldaddr = ia->ia_addr; |
b9ce6c7a MK |
352 | ia->ia_addr = *(struct sockaddr *)sin; |
353 | ||
354 | /* | |
355 | * Give the interface a chance to initialize | |
356 | * if this is its first address, | |
357 | * and to validate the address if necessary. | |
358 | */ | |
359 | if (ifp->if_ioctl && (error = (*ifp->if_ioctl)(ifp, SIOCSIFADDR, ia))) { | |
360 | splx(s); | |
2c83bd95 | 361 | ia->ia_addr = oldaddr; |
b9ce6c7a MK |
362 | return (error); |
363 | } | |
364 | ||
65b95551 MK |
365 | /* |
366 | * Delete any previous route for an old address. | |
367 | */ | |
2c83bd95 MK |
368 | bzero((caddr_t)&netaddr, sizeof (netaddr)); |
369 | netaddr.sin_family = AF_INET; | |
65b95551 | 370 | if (ia->ia_flags & IFA_ROUTE) { |
2c83bd95 MK |
371 | if (ifp->if_flags & IFF_LOOPBACK) |
372 | rtinit(&oldaddr, &oldaddr, (int)SIOCDELRT, RTF_HOST); | |
373 | else if (ifp->if_flags & IFF_POINTOPOINT) | |
374 | rtinit(&ia->ia_dstaddr, &oldaddr, (int)SIOCDELRT, | |
375 | RTF_HOST); | |
376 | else { | |
377 | netaddr.sin_addr = in_makeaddr(ia->ia_subnet, | |
378 | INADDR_ANY); | |
379 | rtinit((struct sockaddr *)&netaddr, &oldaddr, | |
aca5d587 | 380 | (int)SIOCDELRT, 0); |
2c83bd95 | 381 | } |
65b95551 MK |
382 | ia->ia_flags &= ~IFA_ROUTE; |
383 | } | |
65b95551 MK |
384 | if (IN_CLASSA(i)) |
385 | ia->ia_netmask = IN_CLASSA_NET; | |
386 | else if (IN_CLASSB(i)) | |
387 | ia->ia_netmask = IN_CLASSB_NET; | |
388 | else | |
389 | ia->ia_netmask = IN_CLASSC_NET; | |
390 | ia->ia_net = i & ia->ia_netmask; | |
391 | /* | |
392 | * The subnet mask includes at least the standard network part, | |
393 | * but may already have been set to a larger value. | |
394 | */ | |
395 | ia->ia_subnetmask |= ia->ia_netmask; | |
396 | ia->ia_subnet = i & ia->ia_subnetmask; | |
397 | if (ifp->if_flags & IFF_BROADCAST) { | |
398 | ia->ia_broadaddr.sa_family = AF_INET; | |
399 | ((struct sockaddr_in *)(&ia->ia_broadaddr))->sin_addr = | |
400 | in_makeaddr(ia->ia_subnet, INADDR_BROADCAST); | |
4afb57fa MK |
401 | ia->ia_netbroadcast.s_addr = |
402 | htonl(ia->ia_net | (INADDR_BROADCAST &~ ia->ia_netmask)); | |
65b95551 | 403 | } |
65b95551 MK |
404 | /* |
405 | * Add route for the network. | |
406 | */ | |
2c83bd95 MK |
407 | if (ifp->if_flags & IFF_LOOPBACK) |
408 | rtinit(&ia->ia_addr, &ia->ia_addr, (int)SIOCADDRT, | |
409 | RTF_HOST|RTF_UP); | |
410 | else if (ifp->if_flags & IFF_POINTOPOINT) | |
411 | rtinit(&ia->ia_dstaddr, &ia->ia_addr, (int)SIOCADDRT, | |
412 | RTF_HOST|RTF_UP); | |
413 | else { | |
414 | netaddr.sin_addr = in_makeaddr(ia->ia_subnet, INADDR_ANY); | |
415 | rtinit((struct sockaddr *)&netaddr, &ia->ia_addr, | |
416 | (int)SIOCADDRT, RTF_UP); | |
417 | } | |
65b95551 | 418 | ia->ia_flags |= IFA_ROUTE; |
d6c52d1d | 419 | splx(s); |
773256ba | 420 | return (0); |
65b95551 MK |
421 | } |
422 | ||
423 | /* | |
424 | * Return address info for specified internet network. | |
425 | */ | |
426 | struct in_ifaddr * | |
427 | in_iaonnetof(net) | |
428 | u_long net; | |
429 | { | |
430 | register struct in_ifaddr *ia; | |
431 | ||
432 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
433 | if (ia->ia_subnet == net) | |
434 | return (ia); | |
435 | return ((struct in_ifaddr *)0); | |
436 | } | |
437 | ||
438 | /* | |
d6c52d1d | 439 | * Return 1 if the address might be a local broadcast address. |
65b95551 MK |
440 | */ |
441 | in_broadcast(in) | |
442 | struct in_addr in; | |
8473bbab | 443 | { |
65b95551 | 444 | register struct in_ifaddr *ia; |
d6c52d1d | 445 | u_long t; |
65b95551 MK |
446 | |
447 | /* | |
448 | * Look through the list of addresses for a match | |
449 | * with a broadcast address. | |
450 | */ | |
451 | for (ia = in_ifaddr; ia; ia = ia->ia_next) | |
d6c52d1d MK |
452 | if (ia->ia_ifp->if_flags & IFF_BROADCAST) { |
453 | if (satosin(&ia->ia_broadaddr)->sin_addr.s_addr == in.s_addr) | |
65b95551 | 454 | return (1); |
d6c52d1d MK |
455 | /* |
456 | * Check for old-style (host 0) broadcast. | |
457 | */ | |
458 | if ((t = ntohl(in.s_addr)) == ia->ia_subnet || t == ia->ia_net) | |
459 | return (1); | |
460 | } | |
461 | if (in.s_addr == INADDR_BROADCAST || in.s_addr == INADDR_ANY) | |
462 | return (1); | |
65b95551 | 463 | return (0); |
8473bbab SL |
464 | } |
465 | #endif |