2 * SPDX-License-Identifier: BSD-3-Clause
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31 * @(#)uipc_domain.c 8.2 (Berkeley) 10/18/93
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include <sys/param.h>
38 #include <sys/socket.h>
39 #include <sys/protosw.h>
40 #include <sys/domain.h>
41 #include <sys/eventhandler.h>
42 #include <sys/epoch.h>
44 #include <sys/kernel.h>
46 #include <sys/mutex.h>
47 #include <sys/rmlock.h>
48 #include <sys/socketvar.h>
49 #include <sys/systm.h>
54 * System initialization
56 * Note: domain initialization takes place on a per domain basis
57 * as a result of traversing a SYSINIT linker set. Most likely,
58 * each domain would want to call DOMAIN_SET(9) itself, which
59 * would cause the domain to be added just after domaininit()
60 * is called during startup.
62 * See DOMAIN_SET(9) for details on its use.
65 static void domaininit(void *);
66 SYSINIT(domain, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, domaininit, NULL);
68 static void domainfinalize(void *);
69 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
72 static struct callout pffast_callout;
73 static struct callout pfslow_callout;
75 static void pffasttimo(void *);
76 static void pfslowtimo(void *);
78 static struct rmlock pftimo_lock;
79 RM_SYSINIT(pftimo_lock, &pftimo_lock, "pftimo");
81 static LIST_HEAD(, protosw) pffast_list =
82 LIST_HEAD_INITIALIZER(pffast_list);
83 static LIST_HEAD(, protosw) pfslow_list =
84 LIST_HEAD_INITIALIZER(pfslow_list);
86 struct domain *domains; /* registered protocol domains */
87 int domain_init_status = 0;
88 static struct mtx dom_mtx; /* domain list lock */
89 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
92 * Dummy protocol specific user requests function pointer array.
93 * All functions return EOPNOTSUPP.
95 struct pr_usrreqs nousrreqs = {
96 .pru_accept = pru_accept_notsupp,
97 .pru_attach = pru_attach_notsupp,
98 .pru_bind = pru_bind_notsupp,
99 .pru_connect = pru_connect_notsupp,
100 .pru_connect2 = pru_connect2_notsupp,
101 .pru_control = pru_control_notsupp,
102 .pru_disconnect = pru_disconnect_notsupp,
103 .pru_listen = pru_listen_notsupp,
104 .pru_peeraddr = pru_peeraddr_notsupp,
105 .pru_rcvd = pru_rcvd_notsupp,
106 .pru_rcvoob = pru_rcvoob_notsupp,
107 .pru_send = pru_send_notsupp,
108 .pru_sense = pru_sense_null,
109 .pru_shutdown = pru_shutdown_notsupp,
110 .pru_sockaddr = pru_sockaddr_notsupp,
111 .pru_sosend = pru_sosend_notsupp,
112 .pru_soreceive = pru_soreceive_notsupp,
113 .pru_sopoll = pru_sopoll_notsupp,
117 protosw_init(struct protosw *pr)
119 struct pr_usrreqs *pu;
122 KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!",
123 pr->pr_domain->dom_name,
124 (int)(pr - pr->pr_domain->dom_protosw)));
127 * Protocol switch methods fall into three categories: mandatory,
128 * mandatory but protosw_init() provides a default, and optional.
130 * For true protocols (i.e., pru_attach != NULL), KASSERT truly
131 * mandatory methods with no defaults, and initialize defaults for
132 * other mandatory methods if the protocol hasn't defined an
133 * implementation (NULL function pointer).
136 if (pu->pru_attach != NULL) {
137 KASSERT(pu->pru_abort != NULL,
138 ("protosw_init: %ssw[%d] pru_abort NULL",
139 pr->pr_domain->dom_name,
140 (int)(pr - pr->pr_domain->dom_protosw)));
141 KASSERT(pu->pru_send != NULL,
142 ("protosw_init: %ssw[%d] pru_send NULL",
143 pr->pr_domain->dom_name,
144 (int)(pr - pr->pr_domain->dom_protosw)));
148 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar)
149 DEFAULT(pu->pru_accept, pru_accept_notsupp);
150 DEFAULT(pu->pru_aio_queue, pru_aio_queue_notsupp);
151 DEFAULT(pu->pru_bind, pru_bind_notsupp);
152 DEFAULT(pu->pru_bindat, pru_bindat_notsupp);
153 DEFAULT(pu->pru_connect, pru_connect_notsupp);
154 DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
155 DEFAULT(pu->pru_connectat, pru_connectat_notsupp);
156 DEFAULT(pu->pru_control, pru_control_notsupp);
157 DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp);
158 DEFAULT(pu->pru_listen, pru_listen_notsupp);
159 DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp);
160 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
161 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
162 DEFAULT(pu->pru_sense, pru_sense_null);
163 DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp);
164 DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp);
165 DEFAULT(pu->pru_sosend, sosend_generic);
166 DEFAULT(pu->pru_soreceive, soreceive_generic);
167 DEFAULT(pu->pru_sopoll, sopoll_generic);
168 DEFAULT(pu->pru_ready, pru_ready_notsupp);
175 * Add a new protocol domain to the list of supported domains
176 * Note: you cant unload it again because a socket may be using it.
177 * XXX can't fail at this time.
180 domain_init(void *arg)
182 struct domain *dp = arg;
187 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
191 * Note that with VIMAGE enabled, domain_init() will be
192 * re-invoked for each new vnet that's created. The below lists
193 * are intended to be system-wide, so avoid altering global
194 * state for non-default vnets.
196 if (IS_DEFAULT_VNET(curvnet)) {
197 rm_wlock(&pftimo_lock);
198 if (pr->pr_fasttimo != NULL)
199 LIST_INSERT_HEAD(&pffast_list, pr,
201 if (pr->pr_slowtimo != NULL)
202 LIST_INSERT_HEAD(&pfslow_list, pr,
204 rm_wunlock(&pftimo_lock);
209 * update global information about maximums
211 max_hdr = max_linkhdr + max_protohdr;
212 max_datalen = MHLEN - max_hdr;
214 panic("%s: max_datalen < 1", __func__);
219 vnet_domain_init(void *arg)
222 /* Virtualized case is no different -- call init functions. */
227 vnet_domain_uninit(void *arg)
229 struct domain *dp = arg;
232 (*dp->dom_destroy)();
237 * Add a new protocol domain to the list of supported domains
238 * Note: you cant unload it again because a socket may be using it.
239 * XXX can't fail at this time.
242 domain_add(void *data)
246 dp = (struct domain *)data;
248 dp->dom_next = domains;
251 KASSERT(domain_init_status >= 1,
252 ("attempt to domain_add(%s) before domaininit()",
255 if (domain_init_status < 1)
256 printf("WARNING: attempt to domain_add(%s) before "
257 "domaininit()\n", dp->dom_name);
260 KASSERT(domain_init_status < 2,
261 ("attempt to domain_add(%s) after domainfinalize()",
264 if (domain_init_status >= 2)
265 printf("WARNING: attempt to domain_add(%s) after "
266 "domainfinalize()\n", dp->dom_name);
268 mtx_unlock(&dom_mtx);
272 domain_remove(void *data)
274 struct domain *dp = (struct domain *)data;
276 if (dp->dom_family != PF_NETLINK)
281 domains = dp->dom_next;
284 for (curr = domains; curr != NULL; curr = curr->dom_next) {
285 if (curr->dom_next == dp) {
286 curr->dom_next = dp->dom_next;
291 mtx_unlock(&dom_mtx);
296 domaininit(void *dummy)
299 if (max_linkhdr < 16) /* XXX */
302 callout_init(&pffast_callout, 1);
303 callout_init(&pfslow_callout, 1);
306 KASSERT(domain_init_status == 0, ("domaininit called too late!"));
307 domain_init_status = 1;
308 mtx_unlock(&dom_mtx);
313 domainfinalize(void *dummy)
317 KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
318 domain_init_status = 2;
319 mtx_unlock(&dom_mtx);
321 callout_reset(&pffast_callout, 1, pffasttimo, NULL);
322 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
326 pffinddomain(int family)
330 for (dp = domains; dp != NULL; dp = dp->dom_next)
331 if (dp->dom_family == family)
337 pffindtype(int family, int type)
342 dp = pffinddomain(family);
346 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
347 if (pr->pr_type && pr->pr_type == type)
353 pffindproto(int family, int protocol, int type)
357 struct protosw *maybe;
363 dp = pffinddomain(family);
367 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
368 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
371 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
372 pr->pr_protocol == 0 && maybe == NULL)
379 * The caller must make sure that the new protocol is fully set up and ready to
380 * accept requests before it is registered.
383 pf_proto_register(int family, struct protosw *npr)
385 VNET_ITERATOR_DECL(vnet_iter);
387 struct protosw *pr, *fpr;
391 return (EPFNOSUPPORT);
392 if (npr->pr_type == 0)
394 if (npr->pr_protocol == 0)
395 return (EPROTONOSUPPORT);
396 if (npr->pr_usrreqs == NULL)
399 /* Try to find the specified domain based on the family. */
400 dp = pffinddomain(family);
402 return (EPFNOSUPPORT);
404 /* Initialize backpointer to struct domain. */
409 * Protect us against races when two protocol registrations for
410 * the same protocol happen at the same time.
414 /* The new protocol must not yet exist. */
415 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
416 if ((pr->pr_type == npr->pr_type) &&
417 (pr->pr_protocol == npr->pr_protocol)) {
418 mtx_unlock(&dom_mtx);
419 return (EEXIST); /* XXX: Check only protocol? */
421 /* While here, remember the first free spacer. */
422 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
426 /* If no free spacer is found we can't add the new protocol. */
428 mtx_unlock(&dom_mtx);
432 /* Copy the new struct protosw over the spacer. */
433 bcopy(npr, fpr, sizeof(*fpr));
435 rm_wlock(&pftimo_lock);
436 if (fpr->pr_fasttimo != NULL)
437 LIST_INSERT_HEAD(&pffast_list, fpr, pr_fasttimos);
438 if (fpr->pr_slowtimo != NULL)
439 LIST_INSERT_HEAD(&pfslow_list, fpr, pr_slowtimos);
440 rm_wunlock(&pftimo_lock);
442 /* Job is done, no more protection required. */
443 mtx_unlock(&dom_mtx);
445 /* Initialize and activate the protocol. */
447 VNET_FOREACH(vnet_iter) {
448 CURVNET_SET_QUIET(vnet_iter);
458 * The caller must make sure the protocol and its functions correctly shut down
459 * all sockets and release all locks and memory references.
462 pf_proto_unregister(int family, int protocol, int type)
465 struct protosw *pr, *dpr;
469 return (EPFNOSUPPORT);
471 return (EPROTONOSUPPORT);
475 /* Try to find the specified domain based on the family type. */
476 dp = pffinddomain(family);
478 return (EPFNOSUPPORT);
482 /* Lock out everyone else while we are manipulating the protosw. */
485 /* The protocol must exist and only once. */
486 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
487 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) {
489 mtx_unlock(&dom_mtx);
490 return (EMLINK); /* Should not happen! */
496 /* Protocol does not exist. */
498 mtx_unlock(&dom_mtx);
499 return (EPROTONOSUPPORT);
502 rm_wlock(&pftimo_lock);
503 if (dpr->pr_fasttimo != NULL)
504 LIST_REMOVE(dpr, pr_fasttimos);
505 if (dpr->pr_slowtimo != NULL)
506 LIST_REMOVE(dpr, pr_slowtimos);
507 rm_wunlock(&pftimo_lock);
509 /* De-orbit the protocol and make the slot available again. */
512 dpr->pr_protocol = PROTO_SPACER;
514 dpr->pr_input = NULL;
515 dpr->pr_output = NULL;
516 dpr->pr_ctlinput = NULL;
517 dpr->pr_ctloutput = NULL;
519 dpr->pr_fasttimo = NULL;
520 dpr->pr_slowtimo = NULL;
521 dpr->pr_drain = NULL;
522 dpr->pr_usrreqs = &nousrreqs;
524 /* Job is done, not more protection required. */
525 mtx_unlock(&dom_mtx);
531 pfctlinput(int cmd, struct sockaddr *sa)
538 for (dp = domains; dp; dp = dp->dom_next)
539 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
541 (*pr->pr_ctlinput)(cmd, sa, (void *)0);
545 pfslowtimo(void *arg)
547 struct rm_priotracker tracker;
548 struct epoch_tracker et;
551 rm_rlock(&pftimo_lock, &tracker);
553 LIST_FOREACH(pr, &pfslow_list, pr_slowtimos) {
554 (*pr->pr_slowtimo)();
557 rm_runlock(&pftimo_lock, &tracker);
558 callout_reset(&pfslow_callout, hz / PR_SLOWHZ, pfslowtimo, NULL);
562 pffasttimo(void *arg)
564 struct rm_priotracker tracker;
565 struct epoch_tracker et;
568 rm_rlock(&pftimo_lock, &tracker);
570 LIST_FOREACH(pr, &pffast_list, pr_fasttimos) {
571 (*pr->pr_fasttimo)();
574 rm_runlock(&pftimo_lock, &tracker);
575 callout_reset(&pffast_callout, hz / PR_FASTHZ, pffasttimo, NULL);