sys/kern/uipc_domain.c

   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("$FreeBSD$");
  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 #include <vm/uma.h>
  47
  48 /*
  49  * System initialization
  50  *
  51  * Note: domain initialization takes place on a per domain basis
  52  * as a result of traversing a SYSINIT linker set.  Most likely,
  53  * each domain would want to call DOMAIN_SET(9) itself, which
  54  * would cause the domain to be added just after domaininit()
  55  * is called during startup.
  56  *
  57  * See DOMAIN_SET(9) for details on its use.
  58  */
  59
  60 static void domaininit(void *);
  61 SYSINIT(domain, SI_SUB_PROTO_DOMAIN, SI_ORDER_FIRST, domaininit, NULL);
  62
  63 static void domainfinalize(void *);
  64 SYSINIT(domainfin, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_FIRST, domainfinalize,
  65     NULL);
  66
  67 static struct callout pffast_callout;
  68 static struct callout pfslow_callout;
  69
  70 static void     pffasttimo(void *);
  71 static void     pfslowtimo(void *);
  72
  73 struct domain *domains;         /* registered protocol domains */
  74 int domain_init_status = 0;
  75 struct mtx dom_mtx;             /* domain list lock */
  76 MTX_SYSINIT(domain, &dom_mtx, "domain list", MTX_DEF);
  77
  78 /*
  79  * Dummy protocol specific user requests function pointer array.
  80  * All functions return EOPNOTSUPP.
  81  */
  82 struct pr_usrreqs nousrreqs = {
  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_disconnect =       pru_disconnect_notsupp,
  90         .pru_listen =           pru_listen_notsupp,
  91         .pru_peeraddr =         pru_peeraddr_notsupp,
  92         .pru_rcvd =             pru_rcvd_notsupp,
  93         .pru_rcvoob =           pru_rcvoob_notsupp,
  94         .pru_send =             pru_send_notsupp,
  95         .pru_sense =            pru_sense_null,
  96         .pru_shutdown =         pru_shutdown_notsupp,
  97         .pru_sockaddr =         pru_sockaddr_notsupp,
  98         .pru_sosend =           pru_sosend_notsupp,
  99         .pru_soreceive =        pru_soreceive_notsupp,
 100         .pru_sopoll =           pru_sopoll_notsupp,
 101 };
 102
 103 static void
 104 protosw_init(struct protosw *pr)
 105 {
 106         struct pr_usrreqs *pu;
 107
 108         pu = pr->pr_usrreqs;
 109         KASSERT(pu != NULL, ("protosw_init: %ssw[%d] has no usrreqs!",
 110             pr->pr_domain->dom_name,
 111             (int)(pr - pr->pr_domain->dom_protosw)));
 112
 113 #define DEFAULT(foo, bar)       if ((foo) == NULL)  (foo) = (bar)
 114         DEFAULT(pu->pru_accept, pru_accept_notsupp);
 115         DEFAULT(pu->pru_connect, pru_connect_notsupp);
 116         DEFAULT(pu->pru_connect2, pru_connect2_notsupp);
 117         DEFAULT(pu->pru_control, pru_control_notsupp);
 118         DEFAULT(pu->pru_listen, pru_listen_notsupp);
 119         DEFAULT(pu->pru_rcvd, pru_rcvd_notsupp);
 120         DEFAULT(pu->pru_rcvoob, pru_rcvoob_notsupp);
 121         DEFAULT(pu->pru_sense, pru_sense_null);
 122         DEFAULT(pu->pru_sosend, sosend_generic);
 123         DEFAULT(pu->pru_soreceive, soreceive_generic);
 124         DEFAULT(pu->pru_sopoll, sopoll_generic);
 125 #undef DEFAULT
 126         if (pr->pr_init)
 127                 (*pr->pr_init)();
 128 }
 129
 130 /*
 131  * Add a new protocol domain to the list of supported domains
 132  * Note: you cant unload it again because a socket may be using it.
 133  * XXX can't fail at this time.
 134  */
 135 static void
 136 net_init_domain(struct domain *dp)
 137 {
 138         struct protosw *pr;
 139
 140         if (dp->dom_init)
 141                 (*dp->dom_init)();
 142         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 143                 protosw_init(pr);
 144         /*
 145          * update global information about maximums
 146          */
 147         max_hdr = max_linkhdr + max_protohdr;
 148         max_datalen = MHLEN - max_hdr;
 149         if (max_datalen < 1)
 150                 panic("%s: max_datalen < 1", __func__);
 151 }
 152
 153 /*
 154  * Add a new protocol domain to the list of supported domains
 155  * Note: you cant unload it again because a socket may be using it.
 156  * XXX can't fail at this time.
 157  */
 158 void
 159 net_add_domain(void *data)
 160 {
 161         struct domain *dp;
 162
 163         dp = (struct domain *)data;
 164         mtx_lock(&dom_mtx);
 165         dp->dom_next = domains;
 166         domains = dp;
 167
 168         KASSERT(domain_init_status >= 1,
 169             ("attempt to net_add_domain(%s) before domaininit()",
 170             dp->dom_name));
 171 #ifndef INVARIANTS
 172         if (domain_init_status < 1)
 173                 printf("WARNING: attempt to net_add_domain(%s) before "
 174                     "domaininit()\n", dp->dom_name);
 175 #endif
 176 #ifdef notyet
 177         KASSERT(domain_init_status < 2,
 178             ("attempt to net_add_domain(%s) after domainfinalize()",
 179             dp->dom_name));
 180 #else
 181         if (domain_init_status >= 2)
 182                 printf("WARNING: attempt to net_add_domain(%s) after "
 183                     "domainfinalize()\n", dp->dom_name);
 184 #endif
 185         mtx_unlock(&dom_mtx);
 186         net_init_domain(dp);
 187 }
 188
 189 static void
 190 socket_zone_change(void *tag)
 191 {
 192
 193         uma_zone_set_max(socket_zone, maxsockets);
 194 }
 195
 196 /* ARGSUSED*/
 197 static void
 198 domaininit(void *dummy)
 199 {
 200
 201         /*
 202          * Before we do any setup, make sure to initialize the
 203          * zone allocator we get struct sockets from.
 204          */
 205         socket_zone = uma_zcreate("socket", sizeof(struct socket), NULL, NULL,
 206             NULL, NULL, UMA_ALIGN_PTR, UMA_ZONE_NOFREE);
 207         uma_zone_set_max(socket_zone, maxsockets);
 208         EVENTHANDLER_REGISTER(maxsockets_change, socket_zone_change, NULL,
 209                 EVENTHANDLER_PRI_FIRST);
 210
 211         if (max_linkhdr < 16)           /* XXX */
 212                 max_linkhdr = 16;
 213
 214         callout_init(&pffast_callout, CALLOUT_MPSAFE);
 215         callout_init(&pfslow_callout, CALLOUT_MPSAFE);
 216
 217         mtx_lock(&dom_mtx);
 218         KASSERT(domain_init_status == 0, ("domaininit called too late!"));
 219         domain_init_status = 1;
 220         mtx_unlock(&dom_mtx);
 221 }
 222
 223 /* ARGSUSED*/
 224 static void
 225 domainfinalize(void *dummy)
 226 {
 227
 228         mtx_lock(&dom_mtx);
 229         KASSERT(domain_init_status == 1, ("domainfinalize called too late!"));
 230         domain_init_status = 2;
 231         mtx_unlock(&dom_mtx);
 232
 233         callout_reset(&pffast_callout, 1, pffasttimo, NULL);
 234         callout_reset(&pfslow_callout, 1, pfslowtimo, NULL);
 235 }
 236
 237 struct protosw *
 238 pffindtype(int family, int type)
 239 {
 240         struct domain *dp;
 241         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(int family, int protocol, int type)
 256 {
 257         struct domain *dp;
 258         struct protosw *pr;
 259         struct protosw *maybe = 0;
 260
 261         if (family == 0)
 262                 return (0);
 263         for (dp = domains; dp; dp = dp->dom_next)
 264                 if (dp->dom_family == family)
 265                         goto found;
 266         return (0);
 267 found:
 268         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
 269                 if ((pr->pr_protocol == protocol) && (pr->pr_type == type))
 270                         return (pr);
 271
 272                 if (type == SOCK_RAW && pr->pr_type == SOCK_RAW &&
 273                     pr->pr_protocol == 0 && maybe == (struct protosw *)0)
 274                         maybe = pr;
 275         }
 276         return (maybe);
 277 }
 278
 279 /*
 280  * The caller must make sure that the new protocol is fully set up and ready to
 281  * accept requests before it is registered.
 282  */
 283 int
 284 pf_proto_register(int family, struct protosw *npr)
 285 {
 286         struct domain *dp;
 287         struct protosw *pr, *fpr;
 288
 289         /* Sanity checks. */
 290         if (family == 0)
 291                 return (EPFNOSUPPORT);
 292         if (npr->pr_type == 0)
 293                 return (EPROTOTYPE);
 294         if (npr->pr_protocol == 0)
 295                 return (EPROTONOSUPPORT);
 296         if (npr->pr_usrreqs == NULL)
 297                 return (ENXIO);
 298
 299         /* Try to find the specified domain based on the family. */
 300         for (dp = domains; dp; dp = dp->dom_next)
 301                 if (dp->dom_family == family)
 302                         goto found;
 303         return (EPFNOSUPPORT);
 304
 305 found:
 306         /* Initialize backpointer to struct domain. */
 307         npr->pr_domain = dp;
 308         fpr = NULL;
 309
 310         /*
 311          * Protect us against races when two protocol registrations for
 312          * the same protocol happen at the same time.
 313          */
 314         mtx_lock(&Giant);
 315
 316         /* The new protocol must not yet exist. */
 317         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
 318                 if ((pr->pr_type == npr->pr_type) &&
 319                     (pr->pr_protocol == npr->pr_protocol)) {
 320                         mtx_unlock(&Giant);
 321                         return (EEXIST);        /* XXX: Check only protocol? */
 322                 }
 323                 /* While here, remember the first free spacer. */
 324                 if ((fpr == NULL) && (pr->pr_protocol == PROTO_SPACER))
 325                         fpr = pr;
 326         }
 327
 328         /* If no free spacer is found we can't add the new protocol. */
 329         if (fpr == NULL) {
 330                 mtx_unlock(&Giant);
 331                 return (ENOMEM);
 332         }
 333
 334         /* Copy the new struct protosw over the spacer. */
 335         bcopy(npr, fpr, sizeof(*fpr));
 336
 337         /* Job is done, no more protection required. */
 338         mtx_unlock(&Giant);
 339
 340         /* Initialize and activate the protocol. */
 341         protosw_init(fpr);
 342
 343         return (0);
 344 }
 345
 346 /*
 347  * The caller must make sure the protocol and its functions correctly shut down
 348  * all sockets and release all locks and memory references.
 349  */
 350 int
 351 pf_proto_unregister(int family, int protocol, int type)
 352 {
 353         struct domain *dp;
 354         struct protosw *pr, *dpr;
 355
 356         /* Sanity checks. */
 357         if (family == 0)
 358                 return (EPFNOSUPPORT);
 359         if (protocol == 0)
 360                 return (EPROTONOSUPPORT);
 361         if (type == 0)
 362                 return (EPROTOTYPE);
 363
 364         /* Try to find the specified domain based on the family type. */
 365         for (dp = domains; dp; dp = dp->dom_next)
 366                 if (dp->dom_family == family)
 367                         goto found;
 368         return (EPFNOSUPPORT);
 369
 370 found:
 371         dpr = NULL;
 372
 373         /* Lock out everyone else while we are manipulating the protosw. */
 374         mtx_lock(&Giant);
 375
 376         /* The protocol must exist and only once. */
 377         for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++) {
 378                 if ((pr->pr_type == type) && (pr->pr_protocol == protocol)) {
 379                         if (dpr != NULL) {
 380                                 mtx_unlock(&Giant);
 381                                 return (EMLINK);   /* Should not happen! */
 382                         } else
 383                                 dpr = pr;
 384                 }
 385         }
 386
 387         /* Protocol does not exist. */
 388         if (dpr == NULL) {
 389                 mtx_unlock(&Giant);
 390                 return (EPROTONOSUPPORT);
 391         }
 392
 393         /* De-orbit the protocol and make the slot available again. */
 394         dpr->pr_type = 0;
 395         dpr->pr_domain = dp;
 396         dpr->pr_protocol = PROTO_SPACER;
 397         dpr->pr_flags = 0;
 398         dpr->pr_input = NULL;
 399         dpr->pr_output = NULL;
 400         dpr->pr_ctlinput = NULL;
 401         dpr->pr_ctloutput = NULL;
 402         dpr->pr_ousrreq = NULL;
 403         dpr->pr_init = NULL;
 404         dpr->pr_fasttimo = NULL;
 405         dpr->pr_slowtimo = NULL;
 406         dpr->pr_drain = NULL;
 407         dpr->pr_usrreqs = &nousrreqs;
 408
 409         /* Job is done, not more protection required. */
 410         mtx_unlock(&Giant);
 411
 412         return (0);
 413 }
 414
 415 void
 416 pfctlinput(int cmd, struct sockaddr *sa)
 417 {
 418         struct domain *dp;
 419         struct protosw *pr;
 420
 421         for (dp = domains; dp; dp = dp->dom_next)
 422                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 423                         if (pr->pr_ctlinput)
 424                                 (*pr->pr_ctlinput)(cmd, sa, (void *)0);
 425 }
 426
 427 void
 428 pfctlinput2(int cmd, struct sockaddr *sa, void *ctlparam)
 429 {
 430         struct domain *dp;
 431         struct protosw *pr;
 432
 433         if (!sa)
 434                 return;
 435         for (dp = domains; dp; dp = dp->dom_next) {
 436                 /*
 437                  * the check must be made by xx_ctlinput() anyways, to
 438                  * make sure we use data item pointed to by ctlparam in
 439                  * correct way.  the following check is made just for safety.
 440                  */
 441                 if (dp->dom_family != sa->sa_family)
 442                         continue;
 443
 444                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 445                         if (pr->pr_ctlinput)
 446                                 (*pr->pr_ctlinput)(cmd, sa, ctlparam);
 447         }
 448 }
 449
 450 static void
 451 pfslowtimo(void *arg)
 452 {
 453         struct domain *dp;
 454         struct protosw *pr;
 455
 456         for (dp = domains; dp; dp = dp->dom_next)
 457                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 458                         if (pr->pr_slowtimo)
 459                                 (*pr->pr_slowtimo)();
 460         callout_reset(&pfslow_callout, hz/2, pfslowtimo, NULL);
 461 }
 462
 463 static void
 464 pffasttimo(void *arg)
 465 {
 466         struct domain *dp;
 467         struct protosw *pr;
 468
 469         for (dp = domains; dp; dp = dp->dom_next)
 470                 for (pr = dp->dom_protosw; pr < dp->dom_protoswNPROTOSW; pr++)
 471                         if (pr->pr_fasttimo)
 472                                 (*pr->pr_fasttimo)();
 473         callout_reset(&pffast_callout, hz/5, pffasttimo, NULL);
 474 }