1 /* $NetBSD: in_proto.c,v 1.94 2008/04/24 11:38:37 ad Exp $ */
2
3 /*
4 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the project nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 /*
33 * Copyright (c) 1982, 1986, 1993
34 * The Regents of the University of California. All rights reserved.
35 *
36 * Redistribution and use in source and binary forms, with or without
37 * modification, are permitted provided that the following conditions
38 * are met:
39 * 1. Redistributions of source code must retain the above copyright
40 * notice, this list of conditions and the following disclaimer.
41 * 2. Redistributions in binary form must reproduce the above copyright
42 * notice, this list of conditions and the following disclaimer in the
43 * documentation and/or other materials provided with the distribution.
44 * 3. Neither the name of the University nor the names of its contributors
45 * may be used to endorse or promote products derived from this software
46 * without specific prior written permission.
47 *
48 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
49 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
51 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
52 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
53 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
54 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
55 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
56 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
57 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
58 * SUCH DAMAGE.
59 *
60 * @(#)in_proto.c 8.2 (Berkeley) 2/9/95
61 */
62
63 #include <sys/cdefs.h>
64 __KERNEL_RCSID(0, "$NetBSD: in_proto.c,v 1.94 2008/04/24 11:38:37 ad Exp $");
65
66 #include "opt_mrouting.h"
67 #include "opt_eon.h" /* ISO CLNL over IP */
68 #include "opt_iso.h" /* ISO TP tunneled over IP */
69 #include "opt_inet.h"
70 #include "opt_ipsec.h"
71 #include "opt_pim.h"
72
73 #include <sys/param.h>
74 #include <sys/socket.h>
75 #include <sys/protosw.h>
76 #include <sys/domain.h>
77 #include <sys/mbuf.h>
78
79 #include <net/if.h>
80 #include <net/radix.h>
81 #include <net/route.h>
82
83 #include <netinet/in.h>
84 #include <netinet/in_systm.h>
85 #include <netinet/ip.h>
86 #include <netinet/ip_var.h>
87 #include <netinet/ip_icmp.h>
88 #include <netinet/in_ifattach.h>
89 #include <netinet/in_pcb.h>
90 #include <netinet/in_proto.h>
91
92 #ifdef INET6
93 #ifndef INET
94 #include <netinet/in.h>
95 #endif
96 #include <netinet/ip6.h>
97 #endif
98
99 #include <netinet/igmp_var.h>
100 #ifdef PIM
101 #include <netinet/pim_var.h>
102 #endif
103 #include <netinet/tcp.h>
104 #include <netinet/tcp_fsm.h>
105 #include <netinet/tcp_seq.h>
106 #include <netinet/tcp_timer.h>
107 #include <netinet/tcp_var.h>
108 #include <netinet/tcpip.h>
109 #include <netinet/tcp_debug.h>
110 #include <netinet/udp.h>
111 #include <netinet/udp_var.h>
112 #include <netinet/ip_encap.h>
113
114 /*
115 * TCP/IP protocol family: IP, ICMP, UDP, TCP.
116 */
117
118 #ifdef IPSEC
119 #include <netinet6/ipsec.h>
120 #include <netinet6/ah.h>
121 #ifdef IPSEC_ESP
122 #include <netinet6/esp.h>
123 #endif
124 #include <netinet6/ipcomp.h>
125 #endif /* IPSEC */
126
127 #ifdef FAST_IPSEC
128 #include <netipsec/ipsec.h>
129 #include <netipsec/key.h>
130 #endif /* FAST_IPSEC */
131
132 #ifdef TPIP
133 #include <netiso/tp_param.h>
134 #include <netiso/tp_var.h>
135 #endif /* TPIP */
136
137 #ifdef EON
138 #include <netiso/eonvar.h>
139 #endif /* EON */
140
141 #include "carp.h"
142 #if NCARP > 0
143 #include <netinet/ip_carp.h>
144 #endif
145
146 #include "etherip.h"
147 #if NETHERIP > 0
148 #include <netinet/ip_etherip.h>
149 #endif
150
151 DOMAIN_DEFINE(inetdomain); /* forward declare and add to link set */
152
153 /* Wrappers to acquire kernel_lock. */
154
155 PR_WRAP_USRREQ(rip_usrreq)
156 PR_WRAP_USRREQ(udp_usrreq)
157 PR_WRAP_USRREQ(tcp_usrreq)
158
159 #define rip_usrreq rip_usrreq_wrapper
160 #define udp_usrreq udp_usrreq_wrapper
161 #define tcp_usrreq tcp_usrreq_wrapper
162
163 PR_WRAP_CTLINPUT(rip_ctlinput)
164 PR_WRAP_CTLINPUT(udp_ctlinput)
165 PR_WRAP_CTLINPUT(tcp_ctlinput)
166
167 #define rip_ctlinput rip_ctlinput_wrapper
168 #define udp_ctlinput udp_ctlinput_wrapper
169 #define tcp_ctlinput tcp_ctlinput_wrapper
170
171 PR_WRAP_CTLOUTPUT(rip_ctloutput)
172 PR_WRAP_CTLOUTPUT(udp_ctloutput)
173 PR_WRAP_CTLOUTPUT(tcp_ctloutput)
174
175 #define rip_ctloutput rip_ctloutput_wrapper
176 #define udp_ctloutput udp_ctloutput_wrapper
177 #define tcp_ctloutput tcp_ctloutput_wrapper
178
179 #if defined(IPSEC) || defined(FAST_IPSEC)
180 PR_WRAP_CTLINPUT(ah4_ctlinput)
181
182 #define ah4_ctlinput ah4_ctlinput_wrapper
183 #endif
184
185 #if defined(IPSEC_ESP) || defined(FAST_IPSEC)
186 PR_WRAP_CTLINPUT(esp4_ctlinput)
187
188 #define esp4_ctlinput esp4_ctlinput_wrapper
189 #endif
190
191 #ifdef TPIP
192 PR_WRAP_CTLOUTPUT(tp_ctloutput)
193
194 #define tp_ctloutput tp_ctloutput_wrapper
195
196 PR_WRAP_CTLINPUT(tpip_ctlinput)
197
198 #define tpip_ctlinput tpip_ctlinput_wrapper
199 #endif
200
201 #ifdef EON
202 PR_WRAP_CTLINPUT(eonctlinput)
203
204 #define eonctlinput eonctlinput_wrapper
205 #endif
206
207 const struct protosw inetsw[] = {
208 { .pr_domain = &inetdomain,
209 .pr_init = ip_init,
210 .pr_output = ip_output,
211 .pr_slowtimo = ip_slowtimo,
212 .pr_drain = ip_drain,
213 },
214 { .pr_type = SOCK_DGRAM,
215 .pr_domain = &inetdomain,
216 .pr_protocol = IPPROTO_UDP,
217 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
218 .pr_input = udp_input,
219 .pr_ctlinput = udp_ctlinput,
220 .pr_ctloutput = udp_ctloutput,
221 .pr_usrreq = udp_usrreq,
222 .pr_init = udp_init,
223 },
224 { .pr_type = SOCK_STREAM,
225 .pr_domain = &inetdomain,
226 .pr_protocol = IPPROTO_TCP,
227 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_ABRTACPTDIS|PR_PURGEIF,
228 .pr_input = tcp_input,
229 .pr_ctlinput = tcp_ctlinput,
230 .pr_ctloutput = tcp_ctloutput,
231 .pr_usrreq = tcp_usrreq,
232 .pr_init = tcp_init,
233 .pr_slowtimo = tcp_slowtimo,
234 .pr_drain = tcp_drain,
235 },
236 { .pr_type = SOCK_RAW,
237 .pr_domain = &inetdomain,
238 .pr_protocol = IPPROTO_RAW,
239 .pr_flags = PR_ATOMIC|PR_ADDR|PR_PURGEIF,
240 .pr_input = rip_input,
241 .pr_output = rip_output,
242 .pr_ctlinput = rip_ctlinput,
243 .pr_ctloutput = rip_ctloutput,
244 .pr_usrreq = rip_usrreq,
245 },
246 { .pr_type = SOCK_RAW,
247 .pr_domain = &inetdomain,
248 .pr_protocol = IPPROTO_ICMP,
249 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
250 .pr_input = icmp_input,
251 .pr_output = rip_output,
252 .pr_ctlinput = rip_ctlinput,
253 .pr_ctloutput = rip_ctloutput,
254 .pr_usrreq = rip_usrreq,
255 .pr_init = icmp_init,
256 },
257 #ifdef GATEWAY
258 { .pr_domain = &inetdomain,
259 .pr_protocol = IPPROTO_IP,
260 .pr_slowtimo = ipflow_slowtimo,
261 },
262 #endif /* GATEWAY */
263 #ifdef IPSEC
264 { .pr_type = SOCK_RAW,
265 .pr_domain = &inetdomain,
266 .pr_protocol = IPPROTO_AH,
267 .pr_flags = PR_ATOMIC|PR_ADDR,
268 .pr_input = ah4_input,
269 .pr_ctlinput = ah4_ctlinput,
270 .pr_init = ah4_init,
271 },
272 #ifdef IPSEC_ESP
273 { .pr_type = SOCK_RAW,
274 .pr_domain = &inetdomain,
275 .pr_protocol = IPPROTO_ESP,
276 .pr_flags = PR_ATOMIC|PR_ADDR,
277 .pr_input = esp4_input,
278 .pr_ctlinput = esp4_ctlinput,
279 .pr_init = esp4_init,
280 },
281 #endif /* IPSEC_ESP */
282 { .pr_type = SOCK_RAW,
283 .pr_domain = &inetdomain,
284 .pr_protocol = IPPROTO_IPCOMP,
285 .pr_flags = PR_ATOMIC|PR_ADDR,
286 .pr_input = ipcomp4_input,
287 .pr_init = ipcomp4_init,
288 },
289 #endif /* IPSEC */
290 #ifdef FAST_IPSEC
291 { .pr_type = SOCK_RAW,
292 .pr_domain = &inetdomain,
293 .pr_protocol = IPPROTO_AH,
294 .pr_flags = PR_ATOMIC|PR_ADDR,
295 .pr_input = ipsec4_common_input,
296 .pr_ctlinput = ah4_ctlinput,
297 },
298 { .pr_type = SOCK_RAW,
299 .pr_domain = &inetdomain,
300 .pr_protocol = IPPROTO_ESP,
301 .pr_flags = PR_ATOMIC|PR_ADDR,
302 .pr_input = ipsec4_common_input,
303 .pr_ctlinput = esp4_ctlinput,
304 },
305 { .pr_type = SOCK_RAW,
306 .pr_domain = &inetdomain,
307 .pr_protocol = IPPROTO_IPCOMP,
308 .pr_flags = PR_ATOMIC|PR_ADDR,
309 .pr_input = ipsec4_common_input,
310 },
311 #endif /* FAST_IPSEC */
312 { .pr_type = SOCK_RAW,
313 .pr_domain = &inetdomain,
314 .pr_protocol = IPPROTO_IPV4,
315 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
316 .pr_input = encap4_input,
317 .pr_output = rip_output,
318 .pr_ctlinput = rip_ctlinput,
319 .pr_ctloutput = rip_ctloutput,
320 .pr_usrreq = rip_usrreq,
321 .pr_init = encap_init,
322 },
323 #ifdef INET6
324 { .pr_type = SOCK_RAW,
325 .pr_domain = &inetdomain,
326 .pr_protocol = IPPROTO_IPV6,
327 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
328 .pr_input = encap4_input,
329 .pr_output = rip_output,
330 .pr_ctlinput = rip_ctlinput,
331 .pr_ctloutput = rip_ctloutput,
332 .pr_usrreq = rip_usrreq,
333 .pr_init = encap_init,
334 },
335 #endif /* INET6 */
336 #if NETHERIP > 0
337 { .pr_type = SOCK_RAW,
338 .pr_domain = &inetdomain,
339 .pr_protocol = IPPROTO_ETHERIP,
340 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
341 .pr_input = ip_etherip_input,
342 .pr_output = rip_output,
343 .pr_ctlinput = rip_ctlinput,
344 .pr_ctloutput = rip_ctloutput,
345 .pr_usrreq = rip_usrreq,
346 },
347 #endif /* NETHERIP > 0 */
348 #if NCARP > 0
349 { .pr_type = SOCK_RAW,
350 .pr_domain = &inetdomain,
351 .pr_protocol = IPPROTO_CARP,
352 .pr_flags = PR_ATOMIC|PR_ADDR,
353 .pr_input = carp_proto_input,
354 .pr_output = rip_output,
355 .pr_ctloutput = rip_ctloutput,
356 .pr_usrreq = rip_usrreq,
357 },
358 #endif /* NCARP > 0 */
359 { .pr_type = SOCK_RAW,
360 .pr_domain = &inetdomain,
361 .pr_protocol = IPPROTO_IGMP,
362 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
363 .pr_input = igmp_input,
364 .pr_output = rip_output,
365 .pr_ctloutput = rip_ctloutput,
366 .pr_ctlinput = rip_ctlinput,
367 .pr_usrreq = rip_usrreq,
368 .pr_fasttimo = igmp_fasttimo,
369 .pr_slowtimo = igmp_slowtimo,
370 .pr_init = igmp_init,
371 },
372 #ifdef PIM
373 { .pr_type = SOCK_RAW,
374 .pr_domain = &inetdomain,
375 .pr_protocol = IPPROTO_PIM,
376 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
377 .pr_input = pim_input,
378 .pr_output = rip_output,
379 .pr_ctloutput = rip_ctloutput,
380 .pr_ctlinput = rip_ctlinput,
381 .pr_usrreq = rip_usrreq,
382 },
383 #endif /* PIM */
384 #ifdef TPIP
385 { .pr_type = SOCK_SEQPACKET,
386 .pr_domain = &inetdomain,
387 .pr_protocol = IPPROTO_TP,
388 .pr_flags = PR_CONNREQUIRED|PR_WANTRCVD|PR_LISTEN|PR_LASTHDR|PR_ABRTACPTDIS,
389 .pr_input = tpip_input,
390 .pr_ctloutput = tp_ctloutput,
391 .pr_ctlinput = tpip_ctlinput,
392 .pr_usrreq = tp_usrreq,
393 .pr_init = tp_init,
394 .pr_slowtimo = tp_slowtimo,
395 .pr_drain = tp_drain,
396 },
397 #endif /* TPIP */
398 #ifdef ISO
399 /* EON (ISO CLNL over IP) */
400 #ifdef EON
401 { .pr_type = SOCK_RAW,
402 .pr_domain = &inetdomain,
403 .pr_protocol = IPPROTO_EON,
404 .pr_flags = PR_LASTHDR,
405 .pr_input = eoninput,
406 .pr_ctlinput = eonctlinput,
407 .pr_init = eonprotoinit,
408 },
409 #else
410 { .pr_type = SOCK_RAW,
411 .pr_domain = &inetdomain,
412 .pr_protocol = IPPROTO_EON,
413 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
414 .pr_input = encap4_input,
415 .pr_output = rip_output,
416 .pr_ctloutput = rip_ctloutput,
417 .pr_ctlinput = rip_ctlinput,
418 .pr_usrreq = rip_usrreq,
419 .pr_init = encap_init,
420 },
421 #endif /* EON */
422 #endif /* ISO */
423 /* raw wildcard */
424 { .pr_type = SOCK_RAW,
425 .pr_domain = &inetdomain,
426 .pr_flags = PR_ATOMIC|PR_ADDR|PR_LASTHDR,
427 .pr_input = rip_input,
428 .pr_output = rip_output,
429 .pr_ctloutput = rip_ctloutput,
430 .pr_ctlinput = rip_ctlinput,
431 .pr_usrreq = rip_usrreq,
432 .pr_init = rip_init,
433 },
434 };
435
436 extern struct ifqueue ipintrq;
437
438 const struct sockaddr_in in_any = {
439 .sin_len = sizeof(struct sockaddr_in)
440 , .sin_family = AF_INET
441 , .sin_port = 0
442 , .sin_addr = {.s_addr = 0 /* INADDR_ANY */}
443 };
444
445 struct domain inetdomain = {
446 .dom_family = PF_INET, .dom_name = "internet", .dom_init = NULL,
447 .dom_externalize = NULL, .dom_dispose = NULL,
448 .dom_protosw = inetsw,
449 .dom_protoswNPROTOSW = &inetsw[__arraycount(inetsw)],
450 .dom_rtattach = rn_inithead,
451 .dom_rtoffset = 32, .dom_maxrtkey = sizeof(struct sockaddr_in),
452 #ifdef IPSELSRC
453 .dom_ifattach = in_domifattach,
454 .dom_ifdetach = in_domifdetach,
455 #else
456 .dom_ifattach = NULL,
457 .dom_ifdetach = NULL,
458 #endif
459 .dom_ifqueues = { &ipintrq, NULL },
460 .dom_link = { NULL },
461 .dom_mowner = MOWNER_INIT("",""),
462 .dom_sa_cmpofs = offsetof(struct sockaddr_in, sin_addr),
463 .dom_sa_cmplen = sizeof(struct in_addr),
464 .dom_sa_any = (const struct sockaddr *)&in_any,
465 .dom_sockaddr_const_addr = sockaddr_in_const_addr,
466 .dom_sockaddr_addr = sockaddr_in_addr,
467 .dom_rtcache = LIST_HEAD_INITIALIZER(inetdomain.dom_rtcache)
468 };
469
470 u_char ip_protox[IPPROTO_MAX];
471
472 int icmperrppslim = 100; /* 100pps */
473
474 static void
475 sockaddr_in_addrlen(const struct sockaddr *sa, socklen_t *slenp)
476 {
477 socklen_t slen;
478
479 if (slenp == NULL)
480 return;
481
482 slen = sockaddr_getlen(sa);
483 *slenp = (socklen_t)MIN(sizeof(struct in_addr),
484 slen - MIN(slen, offsetof(struct sockaddr_in, sin_addr)));
485 }
486
487 const void *
488 sockaddr_in_const_addr(const struct sockaddr *sa, socklen_t *slenp)
489 {
490 const struct sockaddr_in *sin;
491
492 sockaddr_in_addrlen(sa, slenp);
493 sin = (const struct sockaddr_in *)sa;
494 return &sin->sin_addr;
495 }
496
497 void *
498 sockaddr_in_addr(struct sockaddr *sa, socklen_t *slenp)
499 {
500 struct sockaddr_in *sin;
501
502 sockaddr_in_addrlen(sa, slenp);
503 sin = (struct sockaddr_in *)sa;
504 return &sin->sin_addr;
505 }
506
507 int
508 sockaddr_in_cmp(const struct sockaddr *sa1, const struct sockaddr *sa2)
509 {
510 uint_fast8_t len;
511 const uint_fast8_t addrofs = offsetof(struct sockaddr_in, sin_addr),
512 addrend = addrofs + sizeof(struct in_addr);
513 int rc;
514 const struct sockaddr_in *sin1, *sin2;
515
516 sin1 = satocsin(sa1);
517 sin2 = satocsin(sa2);
518
519 len = MIN(addrend, MIN(sin1->sin_len, sin2->sin_len));
520
521 if (len > addrofs &&
522 (rc = memcmp(&sin1->sin_addr, &sin2->sin_addr,
523 len - addrofs)) != 0)
524 return rc;
525
526 return sin1->sin_len - sin2->sin_len;
527 }
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