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/6.0/sys/kern/uipc_domain.c 150368 2005-09-20 09:16:10Z glebius $");
34
35 #include <sys/param.h>
36 #include <sys/socket.h>
37 #include <sys/protosw.h>
38 #include <sys/domain.h>
39 #include <sys/mbuf.h>
40 #include <sys/kernel.h>
41 #include <sys/lock.h>
42 #include <sys/mutex.h>
43 #include <sys/socketvar.h>
44 #include <sys/systm.h>
45 #include <vm/uma.h>
46
47 /*
48 * System initialization
49 *
50 * Note: domain initialization takes place on a per domain basis
51 * as a result of traversing a SYSINIT linker set. Most likely,
52 * each domain would want to call DOMAIN_SET(9) itself, which
53 * would cause the domain to be added just after domaininit()
54 * is called during startup.
55 *
56 * See DOMAIN_SET(9) for details on its use.
57 */
58
59 static void domaininit(void *);
60 SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL)
61
62 static void domainfinalize(void *);
63 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
64 NULL)
65
66 static struct callout pffast_callout;
67 static struct callout pfslow_callout;
68
69 static void pffasttimo(void *);
70 static void pfslowtimo(void *);
71
72 struct domain *domains; /* registered protocol domains */
73 int domain_init_status = 0;
74 struct mtx dom_mtx; /* domain list lock */
75 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
76
77 /*
78 * Dummy protocol specific user requests function pointer array.
79 * All functions return EOPNOTSUPP.
80 */
81 struct pr_usrreqs nousrreqs = {
82 .pru_abort = pru_abort_notsupp,
83 .pru_accept = pru_accept_notsupp,
84 .pru_attach = pru_attach_notsupp,
85 .pru_bind = pru_bind_notsupp,
86 .pru_connect = pru_connect_notsupp,
87 .pru_connect2 = pru_connect2_notsupp,
88 .pru_control = pru_control_notsupp,
89 .pru_detach = pru_detach_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 .pru_sosetlabel = pru_sosetlabel_null
103 };
104
105 static void
106 protosw_init(struct protosw *pr)
107 {
108 struct pr_usrreqs *pu;
109
110 pu = pr->pr_usrreqs;
111 KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!",
112 pr->pr_domain->dom_name,
113 (int)(pr - pr->pr_domain->dom_protosw)));
114
115 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar)
116 DEFAULT(pu->pru_accept, pru_accept_notsupp);
117 DEFAULT(pu->pru_connect, pru_connect_notsupp);
118 DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
119 DEFAULT(pu->pru_control, pru_control_notsupp);
120 DEFAULT(pu->pru_listen, pru_listen_notsupp);
121 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
122 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
123 DEFAULT(pu->pru_sense, pru_sense_null);
124 DEFAULT(pu->pru_sosend, sosend);
125 DEFAULT(pu->pru_soreceive, soreceive);
126 DEFAULT(pu->pru_sopoll, sopoll);
127 DEFAULT(pu->pru_sosetlabel, pru_sosetlabel_null);
128 #undef DEFAULT
129 if (pr->pr_init)
130 (*pr->pr_init)();
131 }
132
133 /*
134 * Add a new protocol domain to the list of supported domains
135 * Note: you cant unload it again because a socket may be using it.
136 * XXX can't fail at this time.
137 */
138 static void
139 net_init_domain(struct domain *dp)
140 {
141 struct protosw *pr;
142
143 if (dp->dom_init)
144 (*dp->dom_init)();
145 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
146 protosw_init(pr);
147 /*
148 * update global information about maximums
149 */
150 max_hdr = max_linkhdr + max_protohdr;
151 max_datalen = MHLEN - max_hdr;
152 }
153
154 /*
155 * Add a new protocol domain to the list of supported domains
156 * Note: you cant unload it again because a socket may be using it.
157 * XXX can't fail at this time.
158 */
159 void
160 net_add_domain(void *data)
161 {
162 struct domain *dp;
163
164 dp = (struct domain *)data;
165 mtx_lock(&dom_mtx);
166 dp->dom_next = domains;
167 domains = dp;
168
169 KASSERT(domain_init_status >= 1,
170 ("attempt to net_add_domain(%s) before domaininit()",
171 dp->dom_name));
172 #ifndef INVARIANTS
173 if (domain_init_status < 1)
174 printf("WARNING: attempt to net_add_domain(%s) before "
175 "domaininit()\n", dp->dom_name);
176 #endif
177 #ifdef notyet
178 KASSERT(domain_init_status < 2,
179 ("attempt to net_add_domain(%s) after domainfinalize()",
180 dp->dom_name));
181 #else
182 #ifdef DIAGNOSTIC
183 if (domain_init_status >= 2)
184 printf("WARNING: attempt to net_add_domain(%s) after "
185 "domainfinalize()\n", dp->dom_name);
186 #endif
187 #endif
188 mtx_unlock(&dom_mtx);
189 net_init_domain(dp);
190 }
191
192 /* ARGSUSED*/
193 static void
194 domaininit(void *dummy)
195 {
196 /*
197 * Before we do any setup, make sure to initialize the
198 * zone allocator we get struct sockets from.
199 */
200
201 socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
202 NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
203 uma_zone_set_max(socket_zone, maxsockets);
204
205 if (max_linkhdr < 16) /* XXX */
206 max_linkhdr = 16;
207
208 if (debug_mpsafenet) {
209 callout_init(&pffast_callout, CALLOUT_MPSAFE);
210 callout_init(&pfslow_callout, CALLOUT_MPSAFE);
211 } else {
212 callout_init(&pffast_callout, 0);
213 callout_init(&pfslow_callout, 0);
214 }
215
216 mtx_lock(&dom_mtx);
217 KASSERT(domain_init_status == 0, ("domaininit called too late!"));
218 domain_init_status = 1;
219 mtx_unlock(&dom_mtx);
220 }
221
222 /* ARGSUSED*/
223 static void
224 domainfinalize(void *dummy)
225 {
226 mtx_lock(&dom_mtx);
227 KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
228 domain_init_status = 2;
229 mtx_unlock(&dom_mtx);
230
231 callout_reset(&pffast_callout, 1, pffasttimo, NULL);
232 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
233 }
234
235 struct protosw *
236 pffindtype(family, type)
237 int family;
238 int type;
239 {
240 register struct domain *dp;
241 register struct protosw *pr;
242
243 for (dp = domains; dp; dp = dp->dom_next)
244 if (dp->dom_family == family)
245 goto found;
246 return (0);
247 found:
248 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
249 if (pr->pr_type && pr->pr_type == type)
250 return (pr);
251 return (0);
252 }
253
254 struct protosw *
255 pffindproto(family, protocol, type)
256 int family;
257 int protocol;
258 int type;
259 {
260 register struct domain *dp;
261 register struct protosw *pr;
262 struct protosw *maybe = 0;
263
264 if (family == 0)
265 return (0);
266 for (dp = domains; dp; dp = dp->dom_next)
267 if (dp->dom_family == family)
268 goto found;
269 return (0);
270 found:
271 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
272 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
273 return (pr);
274
275 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
276 pr->pr_protocol == 0 && maybe == (struct protosw *)0)
277 maybe = pr;
278 }
279 return (maybe);
280 }
281
282 /*
283 * The caller must make sure that the new protocol is fully set up and ready to
284 * accept requests before it is registered.
285 */
286 int
287 pf_proto_register(family, npr)
288 int family;
289 struct protosw *npr;
290 {
291 struct domain *dp;
292 struct protosw *pr, *fpr;
293
294 /* Sanity checks. */
295 if (family == 0)
296 return (EPFNOSUPPORT);
297 if (npr->pr_type == 0)
298 return (EPROTOTYPE);
299 if (npr->pr_protocol == 0)
300 return (EPROTONOSUPPORT);
301 if (npr->pr_usrreqs == NULL)
302 return (ENXIO);
303
304 /* Try to find the specified domain based on the family. */
305 for (dp = domains; dp; dp = dp->dom_next)
306 if (dp->dom_family == family)
307 goto found;
308 return (EPFNOSUPPORT);
309
310 found:
311 /* Initialize backpointer to struct domain. */
312 npr->pr_domain = dp;
313 fpr = NULL;
314
315 /*
316 * Protect us against races when two protocol registrations for
317 * the same protocol happen at the same time.
318 */
319 mtx_lock(&Giant);
320
321 /* The new protocol must not yet exist. */
322 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
323 if ((pr->pr_type == npr->pr_type) &&
324 (pr->pr_protocol == npr->pr_protocol)) {
325 mtx_unlock(&Giant);
326 return (EEXIST); /* XXX: Check only protocol? */
327 }
328 /* While here, remember the first free spacer. */
329 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
330 fpr = pr;
331 }
332
333 /* If no free spacer is found we can't add the new protocol. */
334 if (fpr == NULL) {
335 mtx_unlock(&Giant);
336 return (ENOMEM);
337 }
338
339 /* Copy the new struct protosw over the spacer. */
340 bcopy(npr, fpr, sizeof(*fpr));
341
342 /* Job is done, no more protection required. */
343 mtx_unlock(&Giant);
344
345 /* Initialize and activate the protocol. */
346 protosw_init(fpr);
347
348 return (0);
349 }
350
351 /*
352 * The caller must make sure the protocol and its functions correctly shut down
353 * all sockets and release all locks and memory references.
354 */
355 int
356 pf_proto_unregister(family, protocol, type)
357 int family;
358 int protocol;
359 int type;
360 {
361 struct domain *dp;
362 struct protosw *pr, *dpr;
363
364 /* Sanity checks. */
365 if (family == 0)
366 return (EPFNOSUPPORT);
367 if (protocol == 0)
368 return (EPROTONOSUPPORT);
369 if (type == 0)
370 return (EPROTOTYPE);
371
372 /* Try to find the specified domain based on the family type. */
373 for (dp = domains; dp; dp = dp->dom_next)
374 if (dp->dom_family == family)
375 goto found;
376 return (EPFNOSUPPORT);
377
378 found:
379 dpr = NULL;
380
381 /* Lock out everyone else while we are manipulating the protosw. */
382 mtx_lock(&Giant);
383
384 /* The protocol must exist and only once. */
385 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
386 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) {
387 if (dpr != NULL) {
388 mtx_unlock(&Giant);
389 return (EMLINK); /* Should not happen! */
390 } else
391 dpr = pr;
392 }
393 }
394
395 /* Protocol does not exist. */
396 if (dpr == NULL) {
397 mtx_unlock(&Giant);
398 return (EPROTONOSUPPORT);
399 }
400
401 /* De-orbit the protocol and make the slot available again. */
402 dpr->pr_type = 0;
403 dpr->pr_domain = dp;
404 dpr->pr_protocol = PROTO_SPACER;
405 dpr->pr_flags = 0;
406 dpr->pr_input = NULL;
407 dpr->pr_output = NULL;
408 dpr->pr_ctlinput = NULL;
409 dpr->pr_ctloutput = NULL;
410 dpr->pr_ousrreq = NULL;
411 dpr->pr_init = NULL;
412 dpr->pr_fasttimo = NULL;
413 dpr->pr_slowtimo = NULL;
414 dpr->pr_drain = NULL;
415 dpr->pr_usrreqs = &nousrreqs;
416
417 /* Job is done, not more protection required. */
418 mtx_unlock(&Giant);
419
420 return (0);
421 }
422
423 void
424 pfctlinput(cmd, sa)
425 int cmd;
426 struct sockaddr *sa;
427 {
428 register struct domain *dp;
429 register struct protosw *pr;
430
431 for (dp = domains; dp; dp = dp->dom_next)
432 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
433 if (pr->pr_ctlinput)
434 (*pr->pr_ctlinput)(cmd, sa, (void *)0);
435 }
436
437 void
438 pfctlinput2(cmd, sa, ctlparam)
439 int cmd;
440 struct sockaddr *sa;
441 void *ctlparam;
442 {
443 struct domain *dp;
444 struct protosw *pr;
445
446 if (!sa)
447 return;
448 for (dp = domains; dp; dp = dp->dom_next) {
449 /*
450 * the check must be made by xx_ctlinput() anyways, to
451 * make sure we use data item pointed to by ctlparam in
452 * correct way. the following check is made just for safety.
453 */
454 if (dp->dom_family != sa->sa_family)
455 continue;
456
457 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
458 if (pr->pr_ctlinput)
459 (*pr->pr_ctlinput)(cmd, sa, ctlparam);
460 }
461 }
462
463 static void
464 pfslowtimo(arg)
465 void *arg;
466 {
467 register struct domain *dp;
468 register struct protosw *pr;
469
470 NET_ASSERT_GIANT();
471
472 for (dp = domains; dp; dp = dp->dom_next)
473 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
474 if (pr->pr_slowtimo)
475 (*pr->pr_slowtimo)();
476 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL);
477 }
478
479 static void
480 pffasttimo(arg)
481 void *arg;
482 {
483 register struct domain *dp;
484 register struct protosw *pr;
485
486 NET_ASSERT_GIANT();
487
488 for (dp = domains; dp; dp = dp->dom_next)
489 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
490 if (pr->pr_fasttimo)
491 (*pr->pr_fasttimo)();
492 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL);
493 }
Cache object: fd14354b313c379670e15db61bedd4a2
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