1 /* $NetBSD: pfil.c,v 1.20 2001/11/12 23:49:46 lukem Exp $ */ 2 3 /*- 4 * SPDX-License-Identifier: BSD-3-Clause 5 * 6 * Copyright (c) 2019 Gleb Smirnoff <glebius@FreeBSD.org> 7 * Copyright (c) 1996 Matthew R. Green 8 * All rights reserved. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. The name of the author may not be used to endorse or promote products 19 * derived from this software without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 22 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 23 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 24 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 27 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #include <sys/param.h> 35 #include <sys/conf.h> 36 #include <sys/kernel.h> 37 #include <sys/epoch.h> 38 #include <sys/errno.h> 39 #include <sys/lock.h> 40 #include <sys/malloc.h> 41 #include <sys/socket.h> 42 #include <sys/socketvar.h> 43 #include <sys/systm.h> 44 #include <sys/lock.h> 45 #include <sys/mutex.h> 46 #include <sys/proc.h> 47 #include <sys/queue.h> 48 #include <sys/ucred.h> 49 #include <sys/jail.h> 50 51 #include <net/if.h> 52 #include <net/if_var.h> 53 #include <net/pfil.h> 54 55 static MALLOC_DEFINE(M_PFIL, "pfil", "pfil(9) packet filter hooks"); 56 57 static int pfil_ioctl(struct cdev *, u_long, caddr_t, int, struct thread *); 58 static struct cdevsw pfil_cdevsw = { 59 .d_ioctl = pfil_ioctl, 60 .d_name = PFILDEV, 61 .d_version = D_VERSION, 62 }; 63 static struct cdev *pfil_dev; 64 65 static struct mtx pfil_lock; 66 MTX_SYSINIT(pfil_mtxinit, &pfil_lock, "pfil(9) lock", MTX_DEF); 67 #define PFIL_LOCK() mtx_lock(&pfil_lock) 68 #define PFIL_UNLOCK() mtx_unlock(&pfil_lock) 69 #define PFIL_LOCK_ASSERT() mtx_assert(&pfil_lock, MA_OWNED) 70 71 struct pfil_hook { 72 pfil_mbuf_chk_t hook_mbuf_chk; 73 pfil_mem_chk_t hook_mem_chk; 74 void *hook_ruleset; 75 int hook_flags; 76 int hook_links; 77 enum pfil_types hook_type; 78 const char *hook_modname; 79 const char *hook_rulname; 80 LIST_ENTRY(pfil_hook) hook_list; 81 }; 82 83 struct pfil_link { 84 CK_STAILQ_ENTRY(pfil_link) link_chain; 85 pfil_mbuf_chk_t link_mbuf_chk; 86 pfil_mem_chk_t link_mem_chk; 87 void *link_ruleset; 88 int link_flags; 89 struct pfil_hook *link_hook; 90 struct epoch_context link_epoch_ctx; 91 }; 92 93 typedef CK_STAILQ_HEAD(pfil_chain, pfil_link) pfil_chain_t; 94 struct pfil_head { 95 int head_nhooksin; 96 int head_nhooksout; 97 pfil_chain_t head_in; 98 pfil_chain_t head_out; 99 int head_flags; 100 enum pfil_types head_type; 101 LIST_ENTRY(pfil_head) head_list; 102 const char *head_name; 103 }; 104 105 LIST_HEAD(pfilheadhead, pfil_head); 106 VNET_DEFINE_STATIC(struct pfilheadhead, pfil_head_list) = 107 LIST_HEAD_INITIALIZER(pfil_head_list); 108 #define V_pfil_head_list VNET(pfil_head_list) 109 110 LIST_HEAD(pfilhookhead, pfil_hook); 111 VNET_DEFINE_STATIC(struct pfilhookhead, pfil_hook_list) = 112 LIST_HEAD_INITIALIZER(pfil_hook_list); 113 #define V_pfil_hook_list VNET(pfil_hook_list) 114 115 static struct pfil_link *pfil_link_remove(pfil_chain_t *, pfil_hook_t ); 116 static void pfil_link_free(epoch_context_t); 117 118 /* 119 * To couple a filtering point that provides memory pointer with a filter that 120 * works on mbufs only. 121 */ 122 static __noinline int 123 pfil_fake_mbuf(pfil_mbuf_chk_t func, void *mem, u_int len, struct ifnet *ifp, 124 int flags, void *ruleset, struct mbuf **mp) 125 { 126 struct mbuf m; 127 pfil_return_t rv; 128 129 (void)m_init(&m, M_NOWAIT, MT_DATA, M_NOFREE | M_PKTHDR); 130 m_extadd(&m, mem, len, NULL, NULL, NULL, 0, EXT_RXRING); 131 m.m_len = m.m_pkthdr.len = len; 132 *mp = &m; 133 134 rv = func(mp, ifp, flags, ruleset, NULL); 135 if (rv == PFIL_PASS && *mp != &m) { 136 /* 137 * Firewalls that need pfil_fake_mbuf() most likely don't 138 * know they need return PFIL_REALLOCED. 139 */ 140 rv = PFIL_REALLOCED; 141 } 142 143 return (rv); 144 } 145 146 static __always_inline int 147 pfil_mem_common(pfil_chain_t *pch, void *mem, u_int len, int flags, 148 struct ifnet *ifp, struct mbuf **m) 149 { 150 struct pfil_link *link; 151 pfil_return_t rv; 152 bool realloc = false; 153 154 NET_EPOCH_ASSERT(); 155 KASSERT(flags == PFIL_IN || flags == PFIL_OUT, 156 ("%s: unsupported flags %d", __func__, flags)); 157 158 rv = PFIL_PASS; 159 CK_STAILQ_FOREACH(link, pch, link_chain) { 160 if (__predict_true(link->link_mem_chk != NULL && !realloc)) 161 rv = link->link_mem_chk(mem, len, flags, ifp, 162 link->link_ruleset, m); 163 else if (!realloc) 164 rv = pfil_fake_mbuf(link->link_mbuf_chk, mem, len, ifp, 165 flags, link->link_ruleset, m); 166 else 167 rv = link->link_mbuf_chk(m, ifp, flags, 168 link->link_ruleset, NULL); 169 170 if (rv == PFIL_DROPPED || rv == PFIL_CONSUMED) 171 break; 172 else if (rv == PFIL_REALLOCED) 173 realloc = true; 174 } 175 if (realloc && rv == PFIL_PASS) 176 rv = PFIL_REALLOCED; 177 return (rv); 178 } 179 180 int 181 pfil_mem_in(struct pfil_head *head, void *mem, u_int len, struct ifnet *ifp, 182 struct mbuf **m) 183 { 184 185 return (pfil_mem_common(&head->head_in, mem, len, PFIL_IN, ifp, m)); 186 } 187 188 int 189 pfil_mem_out(struct pfil_head *head, void *mem, u_int len, struct ifnet *ifp, 190 struct mbuf **m) 191 { 192 193 return (pfil_mem_common(&head->head_out, mem, len, PFIL_OUT, ifp, m)); 194 } 195 196 static __always_inline int 197 pfil_mbuf_common(pfil_chain_t *pch, struct mbuf **m, struct ifnet *ifp, 198 int flags, struct inpcb *inp) 199 { 200 struct pfil_link *link; 201 pfil_return_t rv; 202 203 NET_EPOCH_ASSERT(); 204 KASSERT((flags & ~(PFIL_IN|PFIL_OUT|PFIL_FWD)) == 0, 205 ("%s: unsupported flags %#x", __func__, flags)); 206 KASSERT((flags & ~PFIL_FWD) == PFIL_IN || 207 (flags & ~PFIL_FWD) == PFIL_OUT, 208 ("%s: conflicting directions %#x", __func__, flags)); 209 210 rv = PFIL_PASS; 211 CK_STAILQ_FOREACH(link, pch, link_chain) { 212 rv = link->link_mbuf_chk(m, ifp, flags, link->link_ruleset, 213 inp); 214 if (rv == PFIL_DROPPED || rv == PFIL_CONSUMED) 215 break; 216 } 217 return (rv); 218 } 219 220 int 221 pfil_mbuf_in(struct pfil_head *head, struct mbuf **m, struct ifnet *ifp, 222 struct inpcb *inp) 223 { 224 225 return (pfil_mbuf_common(&head->head_in, m, ifp, PFIL_IN, inp)); 226 } 227 228 int 229 pfil_mbuf_out(struct pfil_head *head, struct mbuf **m, struct ifnet *ifp, 230 struct inpcb *inp) 231 { 232 233 return (pfil_mbuf_common(&head->head_out, m, ifp, PFIL_OUT, inp)); 234 } 235 236 int 237 pfil_mbuf_fwd(struct pfil_head *head, struct mbuf **m, struct ifnet *ifp, 238 struct inpcb *inp) 239 { 240 241 return (pfil_mbuf_common(&head->head_out, m, ifp, PFIL_OUT | PFIL_FWD, inp)); 242 } 243 244 /* 245 * pfil_head_register() registers a pfil_head with the packet filter hook 246 * mechanism. 247 */ 248 pfil_head_t 249 pfil_head_register(struct pfil_head_args *pa) 250 { 251 struct pfil_head *head, *list; 252 253 MPASS(pa->pa_version == PFIL_VERSION); 254 255 head = malloc(sizeof(struct pfil_head), M_PFIL, M_WAITOK); 256 257 head->head_nhooksin = head->head_nhooksout = 0; 258 head->head_flags = pa->pa_flags; 259 head->head_type = pa->pa_type; 260 head->head_name = pa->pa_headname; 261 CK_STAILQ_INIT(&head->head_in); 262 CK_STAILQ_INIT(&head->head_out); 263 264 PFIL_LOCK(); 265 LIST_FOREACH(list, &V_pfil_head_list, head_list) 266 if (strcmp(pa->pa_headname, list->head_name) == 0) { 267 printf("pfil: duplicate head \"%s\"\n", 268 pa->pa_headname); 269 } 270 LIST_INSERT_HEAD(&V_pfil_head_list, head, head_list); 271 PFIL_UNLOCK(); 272 273 return (head); 274 } 275 276 /* 277 * pfil_head_unregister() removes a pfil_head from the packet filter hook 278 * mechanism. The producer of the hook promises that all outstanding 279 * invocations of the hook have completed before it unregisters the hook. 280 */ 281 void 282 pfil_head_unregister(pfil_head_t ph) 283 { 284 struct pfil_link *link, *next; 285 286 PFIL_LOCK(); 287 LIST_REMOVE(ph, head_list); 288 289 CK_STAILQ_FOREACH_SAFE(link, &ph->head_in, link_chain, next) { 290 link->link_hook->hook_links--; 291 free(link, M_PFIL); 292 } 293 CK_STAILQ_FOREACH_SAFE(link, &ph->head_out, link_chain, next) { 294 link->link_hook->hook_links--; 295 free(link, M_PFIL); 296 } 297 PFIL_UNLOCK(); 298 } 299 300 pfil_hook_t 301 pfil_add_hook(struct pfil_hook_args *pa) 302 { 303 struct pfil_hook *hook, *list; 304 305 MPASS(pa->pa_version == PFIL_VERSION); 306 307 hook = malloc(sizeof(struct pfil_hook), M_PFIL, M_WAITOK | M_ZERO); 308 hook->hook_mbuf_chk = pa->pa_mbuf_chk; 309 hook->hook_mem_chk = pa->pa_mem_chk; 310 hook->hook_ruleset = pa->pa_ruleset; 311 hook->hook_flags = pa->pa_flags; 312 hook->hook_type = pa->pa_type; 313 hook->hook_modname = pa->pa_modname; 314 hook->hook_rulname = pa->pa_rulname; 315 316 PFIL_LOCK(); 317 LIST_FOREACH(list, &V_pfil_hook_list, hook_list) 318 if (strcmp(pa->pa_modname, list->hook_modname) == 0 && 319 strcmp(pa->pa_rulname, list->hook_rulname) == 0) { 320 printf("pfil: duplicate hook \"%s:%s\"\n", 321 pa->pa_modname, pa->pa_rulname); 322 } 323 LIST_INSERT_HEAD(&V_pfil_hook_list, hook, hook_list); 324 PFIL_UNLOCK(); 325 326 return (hook); 327 } 328 329 static int 330 pfil_unlink(struct pfil_link_args *pa, pfil_head_t head, pfil_hook_t hook) 331 { 332 struct pfil_link *in, *out; 333 334 PFIL_LOCK_ASSERT(); 335 336 if (pa->pa_flags & PFIL_IN) { 337 in = pfil_link_remove(&head->head_in, hook); 338 if (in != NULL) { 339 head->head_nhooksin--; 340 hook->hook_links--; 341 } 342 } else 343 in = NULL; 344 if (pa->pa_flags & PFIL_OUT) { 345 out = pfil_link_remove(&head->head_out, hook); 346 if (out != NULL) { 347 head->head_nhooksout--; 348 hook->hook_links--; 349 } 350 } else 351 out = NULL; 352 PFIL_UNLOCK(); 353 354 if (in != NULL) 355 NET_EPOCH_CALL(pfil_link_free, &in->link_epoch_ctx); 356 if (out != NULL) 357 NET_EPOCH_CALL(pfil_link_free, &out->link_epoch_ctx); 358 359 if (in == NULL && out == NULL) 360 return (ENOENT); 361 else 362 return (0); 363 } 364 365 int 366 pfil_link(struct pfil_link_args *pa) 367 { 368 struct pfil_link *in, *out, *link; 369 struct pfil_head *head; 370 struct pfil_hook *hook; 371 int error; 372 373 MPASS(pa->pa_version == PFIL_VERSION); 374 375 if ((pa->pa_flags & (PFIL_IN | PFIL_UNLINK)) == PFIL_IN) 376 in = malloc(sizeof(*in), M_PFIL, M_WAITOK | M_ZERO); 377 else 378 in = NULL; 379 if ((pa->pa_flags & (PFIL_OUT | PFIL_UNLINK)) == PFIL_OUT) 380 out = malloc(sizeof(*out), M_PFIL, M_WAITOK | M_ZERO); 381 else 382 out = NULL; 383 384 PFIL_LOCK(); 385 if (pa->pa_flags & PFIL_HEADPTR) 386 head = pa->pa_head; 387 else 388 LIST_FOREACH(head, &V_pfil_head_list, head_list) 389 if (strcmp(pa->pa_headname, head->head_name) == 0) 390 break; 391 if (pa->pa_flags & PFIL_HOOKPTR) 392 hook = pa->pa_hook; 393 else 394 LIST_FOREACH(hook, &V_pfil_hook_list, hook_list) 395 if (strcmp(pa->pa_modname, hook->hook_modname) == 0 && 396 strcmp(pa->pa_rulname, hook->hook_rulname) == 0) 397 break; 398 if (head == NULL || hook == NULL) { 399 error = ENOENT; 400 goto fail; 401 } 402 403 if (pa->pa_flags & PFIL_UNLINK) 404 return (pfil_unlink(pa, head, hook)); 405 406 if (head->head_type != hook->hook_type || 407 ((hook->hook_flags & pa->pa_flags) & ~head->head_flags)) { 408 error = EINVAL; 409 goto fail; 410 } 411 412 if (pa->pa_flags & PFIL_IN) 413 CK_STAILQ_FOREACH(link, &head->head_in, link_chain) 414 if (link->link_hook == hook) { 415 error = EEXIST; 416 goto fail; 417 } 418 if (pa->pa_flags & PFIL_OUT) 419 CK_STAILQ_FOREACH(link, &head->head_out, link_chain) 420 if (link->link_hook == hook) { 421 error = EEXIST; 422 goto fail; 423 } 424 425 if (pa->pa_flags & PFIL_IN) { 426 in->link_hook = hook; 427 in->link_mbuf_chk = hook->hook_mbuf_chk; 428 in->link_mem_chk = hook->hook_mem_chk; 429 in->link_flags = hook->hook_flags; 430 in->link_ruleset = hook->hook_ruleset; 431 if (pa->pa_flags & PFIL_APPEND) 432 CK_STAILQ_INSERT_TAIL(&head->head_in, in, link_chain); 433 else 434 CK_STAILQ_INSERT_HEAD(&head->head_in, in, link_chain); 435 hook->hook_links++; 436 head->head_nhooksin++; 437 } 438 if (pa->pa_flags & PFIL_OUT) { 439 out->link_hook = hook; 440 out->link_mbuf_chk = hook->hook_mbuf_chk; 441 out->link_mem_chk = hook->hook_mem_chk; 442 out->link_flags = hook->hook_flags; 443 out->link_ruleset = hook->hook_ruleset; 444 if (pa->pa_flags & PFIL_APPEND) 445 CK_STAILQ_INSERT_HEAD(&head->head_out, out, link_chain); 446 else 447 CK_STAILQ_INSERT_TAIL(&head->head_out, out, link_chain); 448 hook->hook_links++; 449 head->head_nhooksout++; 450 } 451 PFIL_UNLOCK(); 452 453 return (0); 454 455 fail: 456 PFIL_UNLOCK(); 457 free(in, M_PFIL); 458 free(out, M_PFIL); 459 return (error); 460 } 461 462 static void 463 pfil_link_free(epoch_context_t ctx) 464 { 465 struct pfil_link *link; 466 467 link = __containerof(ctx, struct pfil_link, link_epoch_ctx); 468 free(link, M_PFIL); 469 } 470 471 /* 472 * pfil_remove_hook removes a filter from all filtering points. 473 */ 474 void 475 pfil_remove_hook(pfil_hook_t hook) 476 { 477 struct pfil_head *head; 478 struct pfil_link *in, *out; 479 480 PFIL_LOCK(); 481 LIST_FOREACH(head, &V_pfil_head_list, head_list) { 482 retry: 483 in = pfil_link_remove(&head->head_in, hook); 484 if (in != NULL) { 485 head->head_nhooksin--; 486 hook->hook_links--; 487 NET_EPOCH_CALL(pfil_link_free, &in->link_epoch_ctx); 488 } 489 out = pfil_link_remove(&head->head_out, hook); 490 if (out != NULL) { 491 head->head_nhooksout--; 492 hook->hook_links--; 493 NET_EPOCH_CALL(pfil_link_free, &out->link_epoch_ctx); 494 } 495 if (in != NULL || out != NULL) 496 /* What if some stupid admin put same filter twice? */ 497 goto retry; 498 } 499 LIST_REMOVE(hook, hook_list); 500 PFIL_UNLOCK(); 501 MPASS(hook->hook_links == 0); 502 free(hook, M_PFIL); 503 } 504 505 /* 506 * Internal: Remove a pfil hook from a hook chain. 507 */ 508 static struct pfil_link * 509 pfil_link_remove(pfil_chain_t *chain, pfil_hook_t hook) 510 { 511 struct pfil_link *link; 512 513 PFIL_LOCK_ASSERT(); 514 515 CK_STAILQ_FOREACH(link, chain, link_chain) 516 if (link->link_hook == hook) { 517 CK_STAILQ_REMOVE(chain, link, pfil_link, link_chain); 518 return (link); 519 } 520 521 return (NULL); 522 } 523 524 static void 525 pfil_init(const void *unused __unused) 526 { 527 struct make_dev_args args; 528 int error __diagused; 529 530 make_dev_args_init(&args); 531 args.mda_flags = MAKEDEV_WAITOK | MAKEDEV_CHECKNAME; 532 args.mda_devsw = &pfil_cdevsw; 533 args.mda_uid = UID_ROOT; 534 args.mda_gid = GID_WHEEL; 535 args.mda_mode = 0600; 536 error = make_dev_s(&args, &pfil_dev, PFILDEV); 537 KASSERT(error == 0, ("%s: failed to create dev: %d", __func__, error)); 538 } 539 /* 540 * Make sure the pfil bits are first before any possible subsystem which 541 * might piggyback on the SI_SUB_PROTO_PFIL. 542 */ 543 SYSINIT(pfil_init, SI_SUB_PROTO_PFIL, SI_ORDER_FIRST, pfil_init, NULL); 544 545 /* 546 * User control interface. 547 */ 548 static int pfilioc_listheads(struct pfilioc_list *); 549 static int pfilioc_listhooks(struct pfilioc_list *); 550 static int pfilioc_link(struct pfilioc_link *); 551 552 static int 553 pfil_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, 554 struct thread *td) 555 { 556 int error; 557 558 CURVNET_SET(TD_TO_VNET(td)); 559 error = 0; 560 switch (cmd) { 561 case PFILIOC_LISTHEADS: 562 error = pfilioc_listheads((struct pfilioc_list *)addr); 563 break; 564 case PFILIOC_LISTHOOKS: 565 error = pfilioc_listhooks((struct pfilioc_list *)addr); 566 break; 567 case PFILIOC_LINK: 568 error = pfilioc_link((struct pfilioc_link *)addr); 569 break; 570 default: 571 error = EINVAL; 572 break; 573 } 574 CURVNET_RESTORE(); 575 return (error); 576 } 577 578 static int 579 pfilioc_listheads(struct pfilioc_list *req) 580 { 581 struct pfil_head *head; 582 struct pfil_link *link; 583 struct pfilioc_head *iohead; 584 struct pfilioc_hook *iohook; 585 u_int nheads, nhooks, hd, hk; 586 int error; 587 588 PFIL_LOCK(); 589 restart: 590 nheads = nhooks = 0; 591 LIST_FOREACH(head, &V_pfil_head_list, head_list) { 592 nheads++; 593 nhooks += head->head_nhooksin + head->head_nhooksout; 594 } 595 PFIL_UNLOCK(); 596 597 if (req->pio_nheads < nheads || req->pio_nhooks < nhooks) { 598 req->pio_nheads = nheads; 599 req->pio_nhooks = nhooks; 600 return (0); 601 } 602 603 iohead = malloc(sizeof(*iohead) * nheads, M_TEMP, M_WAITOK); 604 iohook = malloc(sizeof(*iohook) * nhooks, M_TEMP, M_WAITOK); 605 606 hd = hk = 0; 607 PFIL_LOCK(); 608 LIST_FOREACH(head, &V_pfil_head_list, head_list) { 609 if (hd + 1 > nheads || 610 hk + head->head_nhooksin + head->head_nhooksout > nhooks) { 611 /* Configuration changed during malloc(). */ 612 free(iohead, M_TEMP); 613 free(iohook, M_TEMP); 614 goto restart; 615 } 616 strlcpy(iohead[hd].pio_name, head->head_name, 617 sizeof(iohead[0].pio_name)); 618 iohead[hd].pio_nhooksin = head->head_nhooksin; 619 iohead[hd].pio_nhooksout = head->head_nhooksout; 620 iohead[hd].pio_type = head->head_type; 621 CK_STAILQ_FOREACH(link, &head->head_in, link_chain) { 622 strlcpy(iohook[hk].pio_module, 623 link->link_hook->hook_modname, 624 sizeof(iohook[0].pio_module)); 625 strlcpy(iohook[hk].pio_ruleset, 626 link->link_hook->hook_rulname, 627 sizeof(iohook[0].pio_ruleset)); 628 hk++; 629 } 630 CK_STAILQ_FOREACH(link, &head->head_out, link_chain) { 631 strlcpy(iohook[hk].pio_module, 632 link->link_hook->hook_modname, 633 sizeof(iohook[0].pio_module)); 634 strlcpy(iohook[hk].pio_ruleset, 635 link->link_hook->hook_rulname, 636 sizeof(iohook[0].pio_ruleset)); 637 hk++; 638 } 639 hd++; 640 } 641 PFIL_UNLOCK(); 642 643 error = copyout(iohead, req->pio_heads, 644 sizeof(*iohead) * min(hd, req->pio_nheads)); 645 if (error == 0) 646 error = copyout(iohook, req->pio_hooks, 647 sizeof(*iohook) * min(req->pio_nhooks, hk)); 648 649 req->pio_nheads = hd; 650 req->pio_nhooks = hk; 651 652 free(iohead, M_TEMP); 653 free(iohook, M_TEMP); 654 655 return (error); 656 } 657 658 static int 659 pfilioc_listhooks(struct pfilioc_list *req) 660 { 661 struct pfil_hook *hook; 662 struct pfilioc_hook *iohook; 663 u_int nhooks, hk; 664 int error; 665 666 PFIL_LOCK(); 667 restart: 668 nhooks = 0; 669 LIST_FOREACH(hook, &V_pfil_hook_list, hook_list) 670 nhooks++; 671 PFIL_UNLOCK(); 672 673 if (req->pio_nhooks < nhooks) { 674 req->pio_nhooks = nhooks; 675 return (0); 676 } 677 678 iohook = malloc(sizeof(*iohook) * nhooks, M_TEMP, M_WAITOK); 679 680 hk = 0; 681 PFIL_LOCK(); 682 LIST_FOREACH(hook, &V_pfil_hook_list, hook_list) { 683 if (hk + 1 > nhooks) { 684 /* Configuration changed during malloc(). */ 685 free(iohook, M_TEMP); 686 goto restart; 687 } 688 strlcpy(iohook[hk].pio_module, hook->hook_modname, 689 sizeof(iohook[0].pio_module)); 690 strlcpy(iohook[hk].pio_ruleset, hook->hook_rulname, 691 sizeof(iohook[0].pio_ruleset)); 692 iohook[hk].pio_type = hook->hook_type; 693 iohook[hk].pio_flags = hook->hook_flags; 694 hk++; 695 } 696 PFIL_UNLOCK(); 697 698 error = copyout(iohook, req->pio_hooks, 699 sizeof(*iohook) * min(req->pio_nhooks, hk)); 700 req->pio_nhooks = hk; 701 free(iohook, M_TEMP); 702 703 return (error); 704 } 705 706 static int 707 pfilioc_link(struct pfilioc_link *req) 708 { 709 struct pfil_link_args args; 710 711 if (req->pio_flags & ~(PFIL_IN | PFIL_OUT | PFIL_UNLINK | PFIL_APPEND)) 712 return (EINVAL); 713 714 args.pa_version = PFIL_VERSION; 715 args.pa_flags = req->pio_flags; 716 args.pa_headname = req->pio_name; 717 args.pa_modname = req->pio_module; 718 args.pa_rulname = req->pio_ruleset; 719 720 return (pfil_link(&args)); 721 } 722