1 /*-
2 * Copyright (c) 1982, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * @(#)uipc_domain.c 8.2 (Berkeley) 10/18/93
30 */
31
32 #include <sys/cdefs.h>
33 __FBSDID("$FreeBSD: releng/11.0/sys/kern/uipc_domain.c 301114 2016-06-01 10:14:04Z bz $");
34
35 #include <sys/param.h>
36 #include <sys/socket.h>
37 #include <sys/protosw.h>
38 #include <sys/domain.h>
39 #include <sys/eventhandler.h>
40 #include <sys/mbuf.h>
41 #include <sys/kernel.h>
42 #include <sys/lock.h>
43 #include <sys/mutex.h>
44 #include <sys/socketvar.h>
45 #include <sys/systm.h>
46
47 #include <net/vnet.h>
48
49 /*
50 * System initialization
51 *
52 * Note: domain initialization takes place on a per domain basis
53 * as a result of traversing a SYSINIT linker set. Most likely,
54 * each domain would want to call DOMAIN_SET(9) itself, which
55 * would cause the domain to be added just after domaininit()
56 * is called during startup.
57 *
58 * See DOMAIN_SET(9) for details on its use.
59 */
60
61 static void domaininit(void *);
62 SYSINIT(domain, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, domaininit, NULL);
63
64 static void domainfinalize(void *);
65 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
66 NULL);
67
68 static struct callout pffast_callout;
69 static struct callout pfslow_callout;
70
71 static void pffasttimo(void *);
72 static void pfslowtimo(void *);
73
74 struct domain *domains; /* registered protocol domains */
75 int domain_init_status = 0;
76 static struct mtx dom_mtx; /* domain list lock */
77 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
78
79 /*
80 * Dummy protocol specific user requests function pointer array.
81 * All functions return EOPNOTSUPP.
82 */
83 struct pr_usrreqs nousrreqs = {
84 .pru_accept = pru_accept_notsupp,
85 .pru_attach = pru_attach_notsupp,
86 .pru_bind = pru_bind_notsupp,
87 .pru_connect = pru_connect_notsupp,
88 .pru_connect2 = pru_connect2_notsupp,
89 .pru_control = pru_control_notsupp,
90 .pru_disconnect = pru_disconnect_notsupp,
91 .pru_listen = pru_listen_notsupp,
92 .pru_peeraddr = pru_peeraddr_notsupp,
93 .pru_rcvd = pru_rcvd_notsupp,
94 .pru_rcvoob = pru_rcvoob_notsupp,
95 .pru_send = pru_send_notsupp,
96 .pru_sense = pru_sense_null,
97 .pru_shutdown = pru_shutdown_notsupp,
98 .pru_sockaddr = pru_sockaddr_notsupp,
99 .pru_sosend = pru_sosend_notsupp,
100 .pru_soreceive = pru_soreceive_notsupp,
101 .pru_sopoll = pru_sopoll_notsupp,
102 };
103
104 static void
105 protosw_init(struct protosw *pr)
106 {
107 struct pr_usrreqs *pu;
108
109 pu = pr->pr_usrreqs;
110 KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!",
111 pr->pr_domain->dom_name,
112 (int)(pr - pr->pr_domain->dom_protosw)));
113
114 /*
115 * Protocol switch methods fall into three categories: mandatory,
116 * mandatory but protosw_init() provides a default, and optional.
117 *
118 * For true protocols (i.e., pru_attach != NULL), KASSERT truly
119 * mandatory methods with no defaults, and initialize defaults for
120 * other mandatory methods if the protocol hasn't defined an
121 * implementation (NULL function pointer).
122 */
123 #if 0
124 if (pu->pru_attach != NULL) {
125 KASSERT(pu->pru_abort != NULL,
126 ("protosw_init: %ssw[%d] pru_abort NULL",
127 pr->pr_domain->dom_name,
128 (int)(pr - pr->pr_domain->dom_protosw)));
129 KASSERT(pu->pru_send != NULL,
130 ("protosw_init: %ssw[%d] pru_send NULL",
131 pr->pr_domain->dom_name,
132 (int)(pr - pr->pr_domain->dom_protosw)));
133 }
134 #endif
135
136 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar)
137 DEFAULT(pu->pru_accept, pru_accept_notsupp);
138 DEFAULT(pu->pru_aio_queue, pru_aio_queue_notsupp);
139 DEFAULT(pu->pru_bind, pru_bind_notsupp);
140 DEFAULT(pu->pru_bindat, pru_bindat_notsupp);
141 DEFAULT(pu->pru_connect, pru_connect_notsupp);
142 DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
143 DEFAULT(pu->pru_connectat, pru_connectat_notsupp);
144 DEFAULT(pu->pru_control, pru_control_notsupp);
145 DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp);
146 DEFAULT(pu->pru_listen, pru_listen_notsupp);
147 DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp);
148 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
149 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
150 DEFAULT(pu->pru_sense, pru_sense_null);
151 DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp);
152 DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp);
153 DEFAULT(pu->pru_sosend, sosend_generic);
154 DEFAULT(pu->pru_soreceive, soreceive_generic);
155 DEFAULT(pu->pru_sopoll, sopoll_generic);
156 DEFAULT(pu->pru_ready, pru_ready_notsupp);
157 #undef DEFAULT
158 if (pr->pr_init)
159 (*pr->pr_init)();
160 }
161
162 /*
163 * Add a new protocol domain to the list of supported domains
164 * Note: you cant unload it again because a socket may be using it.
165 * XXX can't fail at this time.
166 */
167 void
168 domain_init(void *arg)
169 {
170 struct domain *dp = arg;
171 struct protosw *pr;
172
173 if (dp->dom_init)
174 (*dp->dom_init)();
175 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
176 protosw_init(pr);
177 /*
178 * update global information about maximums
179 */
180 max_hdr = max_linkhdr + max_protohdr;
181 max_datalen = MHLEN - max_hdr;
182 if (max_datalen < 1)
183 panic("%s: max_datalen < 1", __func__);
184 }
185
186 #ifdef VIMAGE
187 void
188 vnet_domain_init(void *arg)
189 {
190
191 /* Virtualized case is no different -- call init functions. */
192 domain_init(arg);
193 }
194
195 void
196 vnet_domain_uninit(void *arg)
197 {
198 struct domain *dp = arg;
199
200 if (dp->dom_destroy)
201 (*dp->dom_destroy)();
202 }
203 #endif
204
205 /*
206 * Add a new protocol domain to the list of supported domains
207 * Note: you cant unload it again because a socket may be using it.
208 * XXX can't fail at this time.
209 */
210 void
211 domain_add(void *data)
212 {
213 struct domain *dp;
214
215 dp = (struct domain *)data;
216 mtx_lock(&dom_mtx);
217 dp->dom_next = domains;
218 domains = dp;
219
220 KASSERT(domain_init_status >= 1,
221 ("attempt to domain_add(%s) before domaininit()",
222 dp->dom_name));
223 #ifndef INVARIANTS
224 if (domain_init_status < 1)
225 printf("WARNING: attempt to domain_add(%s) before "
226 "domaininit()\n", dp->dom_name);
227 #endif
228 #ifdef notyet
229 KASSERT(domain_init_status < 2,
230 ("attempt to domain_add(%s) after domainfinalize()",
231 dp->dom_name));
232 #else
233 if (domain_init_status >= 2)
234 printf("WARNING: attempt to domain_add(%s) after "
235 "domainfinalize()\n", dp->dom_name);
236 #endif
237 mtx_unlock(&dom_mtx);
238 }
239
240 /* ARGSUSED*/
241 static void
242 domaininit(void *dummy)
243 {
244
245 if (max_linkhdr < 16) /* XXX */
246 max_linkhdr = 16;
247
248 callout_init(&pffast_callout, 1);
249 callout_init(&pfslow_callout, 1);
250
251 mtx_lock(&dom_mtx);
252 KASSERT(domain_init_status == 0, ("domaininit called too late!"));
253 domain_init_status = 1;
254 mtx_unlock(&dom_mtx);
255 }
256
257 /* ARGSUSED*/
258 static void
259 domainfinalize(void *dummy)
260 {
261
262 mtx_lock(&dom_mtx);
263 KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
264 domain_init_status = 2;
265 mtx_unlock(&dom_mtx);
266
267 callout_reset(&pffast_callout, 1, pffasttimo, NULL);
268 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
269 }
270
271 struct domain *
272 pffinddomain(int family)
273 {
274 struct domain *dp;
275
276 for (dp = domains; dp != NULL; dp = dp->dom_next)
277 if (dp->dom_family == family)
278 return (dp);
279 return (NULL);
280 }
281
282 struct protosw *
283 pffindtype(int family, int type)
284 {
285 struct domain *dp;
286 struct protosw *pr;
287
288 dp = pffinddomain(family);
289 if (dp == NULL)
290 return (NULL);
291
292 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
293 if (pr->pr_type && pr->pr_type == type)
294 return (pr);
295 return (NULL);
296 }
297
298 struct protosw *
299 pffindproto(int family, int protocol, int type)
300 {
301 struct domain *dp;
302 struct protosw *pr;
303 struct protosw *maybe;
304
305 maybe = NULL;
306 if (family == 0)
307 return (NULL);
308
309 dp = pffinddomain(family);
310 if (dp == NULL)
311 return (NULL);
312
313 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
314 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
315 return (pr);
316
317 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
318 pr->pr_protocol == 0 && maybe == NULL)
319 maybe = pr;
320 }
321 return (maybe);
322 }
323
324 /*
325 * The caller must make sure that the new protocol is fully set up and ready to
326 * accept requests before it is registered.
327 */
328 int
329 pf_proto_register(int family, struct protosw *npr)
330 {
331 VNET_ITERATOR_DECL(vnet_iter);
332 struct domain *dp;
333 struct protosw *pr, *fpr;
334
335 /* Sanity checks. */
336 if (family == 0)
337 return (EPFNOSUPPORT);
338 if (npr->pr_type == 0)
339 return (EPROTOTYPE);
340 if (npr->pr_protocol == 0)
341 return (EPROTONOSUPPORT);
342 if (npr->pr_usrreqs == NULL)
343 return (ENXIO);
344
345 /* Try to find the specified domain based on the family. */
346 dp = pffinddomain(family);
347 if (dp == NULL)
348 return (EPFNOSUPPORT);
349
350 /* Initialize backpointer to struct domain. */
351 npr->pr_domain = dp;
352 fpr = NULL;
353
354 /*
355 * Protect us against races when two protocol registrations for
356 * the same protocol happen at the same time.
357 */
358 mtx_lock(&dom_mtx);
359
360 /* The new protocol must not yet exist. */
361 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
362 if ((pr->pr_type == npr->pr_type) &&
363 (pr->pr_protocol == npr->pr_protocol)) {
364 mtx_unlock(&dom_mtx);
365 return (EEXIST); /* XXX: Check only protocol? */
366 }
367 /* While here, remember the first free spacer. */
368 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
369 fpr = pr;
370 }
371
372 /* If no free spacer is found we can't add the new protocol. */
373 if (fpr == NULL) {
374 mtx_unlock(&dom_mtx);
375 return (ENOMEM);
376 }
377
378 /* Copy the new struct protosw over the spacer. */
379 bcopy(npr, fpr, sizeof(*fpr));
380
381 /* Job is done, no more protection required. */
382 mtx_unlock(&dom_mtx);
383
384 /* Initialize and activate the protocol. */
385 VNET_LIST_RLOCK();
386 VNET_FOREACH(vnet_iter) {
387 CURVNET_SET_QUIET(vnet_iter);
388 protosw_init(fpr);
389 CURVNET_RESTORE();
390 }
391 VNET_LIST_RUNLOCK();
392
393 return (0);
394 }
395
396 /*
397 * The caller must make sure the protocol and its functions correctly shut down
398 * all sockets and release all locks and memory references.
399 */
400 int
401 pf_proto_unregister(int family, int protocol, int type)
402 {
403 struct domain *dp;
404 struct protosw *pr, *dpr;
405
406 /* Sanity checks. */
407 if (family == 0)
408 return (EPFNOSUPPORT);
409 if (protocol == 0)
410 return (EPROTONOSUPPORT);
411 if (type == 0)
412 return (EPROTOTYPE);
413
414 /* Try to find the specified domain based on the family type. */
415 dp = pffinddomain(family);
416 if (dp == NULL)
417 return (EPFNOSUPPORT);
418
419 dpr = NULL;
420
421 /* Lock out everyone else while we are manipulating the protosw. */
422 mtx_lock(&dom_mtx);
423
424 /* The protocol must exist and only once. */
425 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
426 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) {
427 if (dpr != NULL) {
428 mtx_unlock(&dom_mtx);
429 return (EMLINK); /* Should not happen! */
430 } else
431 dpr = pr;
432 }
433 }
434
435 /* Protocol does not exist. */
436 if (dpr == NULL) {
437 mtx_unlock(&dom_mtx);
438 return (EPROTONOSUPPORT);
439 }
440
441 /* De-orbit the protocol and make the slot available again. */
442 dpr->pr_type = 0;
443 dpr->pr_domain = dp;
444 dpr->pr_protocol = PROTO_SPACER;
445 dpr->pr_flags = 0;
446 dpr->pr_input = NULL;
447 dpr->pr_output = NULL;
448 dpr->pr_ctlinput = NULL;
449 dpr->pr_ctloutput = NULL;
450 dpr->pr_init = NULL;
451 dpr->pr_fasttimo = NULL;
452 dpr->pr_slowtimo = NULL;
453 dpr->pr_drain = NULL;
454 dpr->pr_usrreqs = &nousrreqs;
455
456 /* Job is done, not more protection required. */
457 mtx_unlock(&dom_mtx);
458
459 return (0);
460 }
461
462 void
463 pfctlinput(int cmd, struct sockaddr *sa)
464 {
465 struct domain *dp;
466 struct protosw *pr;
467
468 for (dp = domains; dp; dp = dp->dom_next)
469 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
470 if (pr->pr_ctlinput)
471 (*pr->pr_ctlinput)(cmd, sa, (void *)0);
472 }
473
474 void
475 pfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
476 {
477 struct domain *dp;
478 struct protosw *pr;
479
480 if (!sa)
481 return;
482 for (dp = domains; dp; dp = dp->dom_next) {
483 /*
484 * the check must be made by xx_ctlinput() anyways, to
485 * make sure we use data item pointed to by ctlparam in
486 * correct way. the following check is made just for safety.
487 */
488 if (dp->dom_family != sa->sa_family)
489 continue;
490
491 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
492 if (pr->pr_ctlinput)
493 (*pr->pr_ctlinput)(cmd, sa, ctlparam);
494 }
495 }
496
497 static void
498 pfslowtimo(void *arg)
499 {
500 struct domain *dp;
501 struct protosw *pr;
502
503 for (dp = domains; dp; dp = dp->dom_next)
504 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
505 if (pr->pr_slowtimo)
506 (*pr->pr_slowtimo)();
507 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL);
508 }
509
510 static void
511 pffasttimo(void *arg)
512 {
513 struct domain *dp;
514 struct protosw *pr;
515
516 for (dp = domains; dp; dp = dp->dom_next)
517 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
518 if (pr->pr_fasttimo)
519 (*pr->pr_fasttimo)();
520 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL);
521 }
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