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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>
51 #include <machine/atomic.h>
56 * System initialization
58 * Note: domain initialization takes place on a per domain basis
59 * as a result of traversing a SYSINIT linker set. Most likely,
60 * each domain would want to call DOMAIN_SET(9) itself, which
61 * would cause the domain to be added just after domaininit()
62 * is called during startup.
64 * See DOMAIN_SET(9) for details on its use.
67 static void domaininit(void *);
68 SYSINIT(domain, SI_SUB_PROTO_DOMAININIT, SI_ORDER_ANY, domaininit, NULL);
70 static void domainfinalize(void *);
71 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
74 static struct callout pffast_callout;
75 static struct callout pfslow_callout;
77 static void pffasttimo(void *);
78 static void pfslowtimo(void *);
80 static struct rmlock pftimo_lock;
81 RM_SYSINIT(pftimo_lock, &pftimo_lock, "pftimo");
83 static LIST_HEAD(, protosw) pffast_list =
84 LIST_HEAD_INITIALIZER(pffast_list);
85 static LIST_HEAD(, protosw) pfslow_list =
86 LIST_HEAD_INITIALIZER(pfslow_list);
88 struct domain *domains; /* registered protocol domains */
89 int domain_init_status = 0;
90 static struct mtx dom_mtx; /* domain list lock */
91 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
94 * Dummy protocol specific user requests function pointer array.
95 * All functions return EOPNOTSUPP.
97 struct pr_usrreqs nousrreqs = {
98 .pru_accept = pru_accept_notsupp,
99 .pru_attach = pru_attach_notsupp,
100 .pru_bind = pru_bind_notsupp,
101 .pru_connect = pru_connect_notsupp,
102 .pru_connect2 = pru_connect2_notsupp,
103 .pru_control = pru_control_notsupp,
104 .pru_disconnect = pru_disconnect_notsupp,
105 .pru_listen = pru_listen_notsupp,
106 .pru_peeraddr = pru_peeraddr_notsupp,
107 .pru_rcvd = pru_rcvd_notsupp,
108 .pru_rcvoob = pru_rcvoob_notsupp,
109 .pru_send = pru_send_notsupp,
110 .pru_sense = pru_sense_null,
111 .pru_shutdown = pru_shutdown_notsupp,
112 .pru_sockaddr = pru_sockaddr_notsupp,
113 .pru_sosend = pru_sosend_notsupp,
114 .pru_soreceive = pru_soreceive_notsupp,
115 .pru_sopoll = pru_sopoll_notsupp,
119 pr_usrreqs_init(struct protosw *pr)
121 struct pr_usrreqs *pu;
124 KASSERT(pu != NULL, ("%s: %ssw[%d] has no usrreqs!", __func__,
125 pr->pr_domain->dom_name,
126 (int)(pr - pr->pr_domain->dom_protosw)));
129 * Protocol switch methods fall into three categories: mandatory,
130 * mandatory but protosw_init() provides a default, and optional.
132 * For true protocols (i.e., pru_attach != NULL), KASSERT truly
133 * mandatory methods with no defaults, and initialize defaults for
134 * other mandatory methods if the protocol hasn't defined an
135 * implementation (NULL function pointer).
138 if (pu->pru_attach != NULL) {
139 KASSERT(pu->pru_abort != NULL,
140 ("protosw_init: %ssw[%d] pru_abort NULL",
141 pr->pr_domain->dom_name,
142 (int)(pr - pr->pr_domain->dom_protosw)));
143 KASSERT(pu->pru_send != NULL,
144 ("protosw_init: %ssw[%d] pru_send NULL",
145 pr->pr_domain->dom_name,
146 (int)(pr - pr->pr_domain->dom_protosw)));
150 #define DEFAULT(foo, bar) if ((foo) == NULL) (foo) = (bar)
151 DEFAULT(pu->pru_accept, pru_accept_notsupp);
152 DEFAULT(pu->pru_aio_queue, pru_aio_queue_notsupp);
153 DEFAULT(pu->pru_bind, pru_bind_notsupp);
154 DEFAULT(pu->pru_bindat, pru_bindat_notsupp);
155 DEFAULT(pu->pru_connect, pru_connect_notsupp);
156 DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
157 DEFAULT(pu->pru_connectat, pru_connectat_notsupp);
158 DEFAULT(pu->pru_control, pru_control_notsupp);
159 DEFAULT(pu->pru_disconnect, pru_disconnect_notsupp);
160 DEFAULT(pu->pru_listen, pru_listen_notsupp);
161 DEFAULT(pu->pru_peeraddr, pru_peeraddr_notsupp);
162 DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
163 DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
164 DEFAULT(pu->pru_sense, pru_sense_null);
165 DEFAULT(pu->pru_shutdown, pru_shutdown_notsupp);
166 DEFAULT(pu->pru_sockaddr, pru_sockaddr_notsupp);
167 DEFAULT(pu->pru_sosend, sosend_generic);
168 DEFAULT(pu->pru_soreceive, soreceive_generic);
169 DEFAULT(pu->pru_sopoll, sopoll_generic);
170 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;
186 MPASS(IS_DEFAULT_VNET(curvnet));
188 flags = atomic_load_acq_int(&dp->dom_flags);
189 if ((flags & DOMF_SUPPORTED) == 0)
191 MPASS((flags & DOMF_INITED) == 0);
193 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
195 rm_wlock(&pftimo_lock);
196 if (pr->pr_fasttimo != NULL)
197 LIST_INSERT_HEAD(&pffast_list, pr, pr_fasttimos);
198 if (pr->pr_slowtimo != NULL)
199 LIST_INSERT_HEAD(&pfslow_list, pr, pr_slowtimos);
200 rm_wunlock(&pftimo_lock);
204 * update global information about maximums
206 max_hdr = max_linkhdr + max_protohdr;
207 max_datalen = MHLEN - max_hdr;
209 panic("%s: max_datalen < 1", __func__);
210 atomic_set_rel_int(&dp->dom_flags, DOMF_INITED);
214 * Add a new protocol domain to the list of supported domains
215 * Note: you cant unload it again because a socket may be using it.
216 * XXX can't fail at this time.
219 domain_add(void *data)
223 dp = (struct domain *)data;
224 if (dp->dom_probe != NULL && (*dp->dom_probe)() != 0)
226 atomic_set_rel_int(&dp->dom_flags, DOMF_SUPPORTED);
228 dp->dom_next = domains;
231 KASSERT(domain_init_status >= 1,
232 ("attempt to domain_add(%s) before domaininit()",
235 if (domain_init_status < 1)
236 printf("WARNING: attempt to domain_add(%s) before "
237 "domaininit()\n", dp->dom_name);
239 mtx_unlock(&dom_mtx);
244 domaininit(void *dummy)
247 if (max_linkhdr < 16) /* XXX */
250 callout_init(&pffast_callout, 1);
251 callout_init(&pfslow_callout, 1);
254 KASSERT(domain_init_status == 0, ("domaininit called too late!"));
255 domain_init_status = 1;
256 mtx_unlock(&dom_mtx);
261 domainfinalize(void *dummy)
265 KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
266 domain_init_status = 2;
267 mtx_unlock(&dom_mtx);
269 callout_reset(&pffast_callout, 1, pffasttimo, NULL);
270 callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
274 pffinddomain(int family)
278 for (dp = domains; dp != NULL; dp = dp->dom_next)
279 if (dp->dom_family == family)
285 pffindtype(int family, int type)
290 dp = pffinddomain(family);
294 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
295 if (pr->pr_type && pr->pr_type == type)
301 pffindproto(int family, int protocol, int type)
305 struct protosw *maybe;
311 dp = pffinddomain(family);
315 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
316 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
319 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
320 pr->pr_protocol == 0 && maybe == NULL)
327 * The caller must make sure that the new protocol is fully set up and ready to
328 * accept requests before it is registered.
331 pf_proto_register(int family, struct protosw *npr)
334 struct protosw *pr, *fpr;
338 return (EPFNOSUPPORT);
339 if (npr->pr_type == 0)
341 if (npr->pr_protocol == 0)
342 return (EPROTONOSUPPORT);
343 if (npr->pr_usrreqs == NULL)
346 /* Try to find the specified domain based on the family. */
347 dp = pffinddomain(family);
349 return (EPFNOSUPPORT);
351 /* Initialize backpointer to struct domain. */
356 * Protect us against races when two protocol registrations for
357 * the same protocol happen at the same time.
361 /* The new protocol must not yet exist. */
362 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
363 if ((pr->pr_type == npr->pr_type) &&
364 (pr->pr_protocol == npr->pr_protocol)) {
365 mtx_unlock(&dom_mtx);
366 return (EEXIST); /* XXX: Check only protocol? */
368 /* While here, remember the first free spacer. */
369 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
373 /* If no free spacer is found we can't add the new protocol. */
375 mtx_unlock(&dom_mtx);
379 /* Copy the new struct protosw over the spacer. */
380 bcopy(npr, fpr, sizeof(*fpr));
382 pr_usrreqs_init(fpr);
383 rm_wlock(&pftimo_lock);
384 if (fpr->pr_fasttimo != NULL)
385 LIST_INSERT_HEAD(&pffast_list, fpr, pr_fasttimos);
386 if (fpr->pr_slowtimo != NULL)
387 LIST_INSERT_HEAD(&pfslow_list, fpr, pr_slowtimos);
388 rm_wunlock(&pftimo_lock);
390 /* Job is done, no more protection required. */
391 mtx_unlock(&dom_mtx);
397 * The caller must make sure the protocol and its functions correctly shut down
398 * all sockets and release all locks and memory references.
401 pf_proto_unregister(int family, int protocol, int type)
404 struct protosw *pr, *dpr;
408 return (EPFNOSUPPORT);
410 return (EPROTONOSUPPORT);
414 /* Try to find the specified domain based on the family type. */
415 dp = pffinddomain(family);
417 return (EPFNOSUPPORT);
421 /* Lock out everyone else while we are manipulating the protosw. */
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)) {
428 mtx_unlock(&dom_mtx);
429 return (EMLINK); /* Should not happen! */
435 /* Protocol does not exist. */
437 mtx_unlock(&dom_mtx);
438 return (EPROTONOSUPPORT);
441 rm_wlock(&pftimo_lock);
442 if (dpr->pr_fasttimo != NULL)
443 LIST_REMOVE(dpr, pr_fasttimos);
444 if (dpr->pr_slowtimo != NULL)
445 LIST_REMOVE(dpr, pr_slowtimos);
446 rm_wunlock(&pftimo_lock);
448 /* De-orbit the protocol and make the slot available again. */
451 dpr->pr_protocol = PROTO_SPACER;
453 dpr->pr_input = NULL;
454 dpr->pr_output = NULL;
455 dpr->pr_ctlinput = NULL;
456 dpr->pr_ctloutput = NULL;
457 dpr->pr_fasttimo = NULL;
458 dpr->pr_slowtimo = NULL;
459 dpr->pr_drain = NULL;
460 dpr->pr_usrreqs = &nousrreqs;
462 /* Job is done, not more protection required. */
463 mtx_unlock(&dom_mtx);
469 pfctlinput(int cmd, struct sockaddr *sa)
476 for (dp = domains; dp; dp = dp->dom_next)
477 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
479 (*pr->pr_ctlinput)(cmd, sa, (void *)0);
483 pfslowtimo(void *arg)
485 struct rm_priotracker tracker;
486 struct epoch_tracker et;
489 rm_rlock(&pftimo_lock, &tracker);
491 LIST_FOREACH(pr, &pfslow_list, pr_slowtimos) {
492 (*pr->pr_slowtimo)();
495 rm_runlock(&pftimo_lock, &tracker);
496 callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL);
500 pffasttimo(void *arg)
502 struct rm_priotracker tracker;
503 struct epoch_tracker et;
506 rm_rlock(&pftimo_lock, &tracker);
508 LIST_FOREACH(pr, &pffast_list, pr_fasttimos) {
509 (*pr->pr_fasttimo)();
512 rm_runlock(&pftimo_lock, &tracker);
513 callout_reset(&pffast_callout, hz/5, pffasttimo, NULL);