1/*- 2 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org> 3 * Copyright (c) 1980, 1986, 1993 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 4. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 * 30 * @(#)if.c 8.5 (Berkeley) 1/9/95 31 * $FreeBSD: stable/10/sys/net/if_clone.c 324813 2017-10-21 10:48:06Z avos $ 32 */ 33 34#include <sys/param.h> 35#include <sys/malloc.h> 36#include <sys/limits.h> 37#include <sys/lock.h> 38#include <sys/mutex.h> 39#include <sys/kernel.h> 40#include <sys/systm.h> 41#include <sys/types.h> 42#include <sys/socket.h> 43 44#include <net/if.h> 45#include <net/if_clone.h> 46#include <net/if_var.h> 47#include <net/radix.h> 48#include <net/route.h> 49#include <net/vnet.h> 50 51/* Current IF_MAXUNIT expands maximum to 5 characters. */ 52#define IFCLOSIZ (IFNAMSIZ - 5) 53 54/* 55 * Structure describing a `cloning' interface. 56 * 57 * List of locks 58 * (c) const until freeing 59 * (d) driver specific data, may need external protection. 60 * (e) locked by if_cloners_mtx 61 * (i) locked by ifc_mtx mtx 62 */ 63struct if_clone { 64 char ifc_name[IFCLOSIZ]; /* (c) Name of device, e.g. `gif' */ 65 struct unrhdr *ifc_unrhdr; /* (c) alloc_unr(9) header */ 66 int ifc_maxunit; /* (c) maximum unit number */ 67 long ifc_refcnt; /* (i) Reference count. */ 68 LIST_HEAD(, ifnet) ifc_iflist; /* (i) List of cloned interfaces */ 69 struct mtx ifc_mtx; /* Mutex to protect members. */ 70 71 enum { SIMPLE, ADVANCED } ifc_type; /* (c) */ 72 73 /* (c) Driver specific cloning functions. Called with no locks held. */ 74 union { 75 struct { /* advanced cloner */ 76 ifc_match_t *_ifc_match; 77 ifc_create_t *_ifc_create; 78 ifc_destroy_t *_ifc_destroy; 79 } A; 80 struct { /* simple cloner */ 81 ifcs_create_t *_ifcs_create; 82 ifcs_destroy_t *_ifcs_destroy; 83 int _ifcs_minifs; /* minimum ifs */ 84 85 } S; 86 } U; 87#define ifc_match U.A._ifc_match 88#define ifc_create U.A._ifc_create 89#define ifc_destroy U.A._ifc_destroy 90#define ifcs_create U.S._ifcs_create 91#define ifcs_destroy U.S._ifcs_destroy 92#define ifcs_minifs U.S._ifcs_minifs 93 94 LIST_ENTRY(if_clone) ifc_list; /* (e) On list of cloners */ 95}; 96 97static void if_clone_free(struct if_clone *ifc); 98static int if_clone_createif(struct if_clone *ifc, char *name, size_t len, 99 caddr_t params); 100 101static int ifc_simple_match(struct if_clone *, const char *); 102static int ifc_simple_create(struct if_clone *, char *, size_t, caddr_t); 103static int ifc_simple_destroy(struct if_clone *, struct ifnet *); 104 105static struct mtx if_cloners_mtx; 106static VNET_DEFINE(int, if_cloners_count); 107VNET_DEFINE(LIST_HEAD(, if_clone), if_cloners); 108 109#define V_if_cloners_count VNET(if_cloners_count) 110#define V_if_cloners VNET(if_cloners) 111 112#define IF_CLONERS_LOCK_INIT() \ 113 mtx_init(&if_cloners_mtx, "if_cloners lock", NULL, MTX_DEF) 114#define IF_CLONERS_LOCK_ASSERT() mtx_assert(&if_cloners_mtx, MA_OWNED) 115#define IF_CLONERS_LOCK() mtx_lock(&if_cloners_mtx) 116#define IF_CLONERS_UNLOCK() mtx_unlock(&if_cloners_mtx) 117 118#define IF_CLONE_LOCK_INIT(ifc) \ 119 mtx_init(&(ifc)->ifc_mtx, "if_clone lock", NULL, MTX_DEF) 120#define IF_CLONE_LOCK_DESTROY(ifc) mtx_destroy(&(ifc)->ifc_mtx) 121#define IF_CLONE_LOCK_ASSERT(ifc) mtx_assert(&(ifc)->ifc_mtx, MA_OWNED) 122#define IF_CLONE_LOCK(ifc) mtx_lock(&(ifc)->ifc_mtx) 123#define IF_CLONE_UNLOCK(ifc) mtx_unlock(&(ifc)->ifc_mtx) 124 125#define IF_CLONE_ADDREF(ifc) \ 126 do { \ 127 IF_CLONE_LOCK(ifc); \ 128 IF_CLONE_ADDREF_LOCKED(ifc); \ 129 IF_CLONE_UNLOCK(ifc); \ 130 } while (0) 131#define IF_CLONE_ADDREF_LOCKED(ifc) \ 132 do { \ 133 IF_CLONE_LOCK_ASSERT(ifc); \ 134 KASSERT((ifc)->ifc_refcnt >= 0, \ 135 ("negative refcnt %ld", (ifc)->ifc_refcnt)); \ 136 (ifc)->ifc_refcnt++; \ 137 } while (0) 138#define IF_CLONE_REMREF(ifc) \ 139 do { \ 140 IF_CLONE_LOCK(ifc); \ 141 IF_CLONE_REMREF_LOCKED(ifc); \ 142 } while (0) 143#define IF_CLONE_REMREF_LOCKED(ifc) \ 144 do { \ 145 IF_CLONE_LOCK_ASSERT(ifc); \ 146 KASSERT((ifc)->ifc_refcnt > 0, \ 147 ("bogus refcnt %ld", (ifc)->ifc_refcnt)); \ 148 if (--(ifc)->ifc_refcnt == 0) { \ 149 IF_CLONE_UNLOCK(ifc); \ 150 if_clone_free(ifc); \ 151 } else { \ 152 /* silently free the lock */ \ 153 IF_CLONE_UNLOCK(ifc); \ 154 } \ 155 } while (0) 156 157#define IFC_IFLIST_INSERT(_ifc, _ifp) \ 158 LIST_INSERT_HEAD(&_ifc->ifc_iflist, _ifp, if_clones) 159#define IFC_IFLIST_REMOVE(_ifc, _ifp) \ 160 LIST_REMOVE(_ifp, if_clones) 161 162static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 163 164void 165vnet_if_clone_init(void) 166{ 167 168 LIST_INIT(&V_if_cloners); 169} 170 171void 172if_clone_init(void) 173{ 174 175 IF_CLONERS_LOCK_INIT(); 176} 177 178/* 179 * Lookup and create a clone network interface. 180 */ 181int 182if_clone_create(char *name, size_t len, caddr_t params) 183{ 184 struct if_clone *ifc; 185 186 /* Try to find an applicable cloner for this request */ 187 IF_CLONERS_LOCK(); 188 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) 189 if (ifc->ifc_type == SIMPLE) { 190 if (ifc_simple_match(ifc, name)) 191 break; 192 } else { 193 if (ifc->ifc_match(ifc, name)) 194 break; 195 } 196#ifdef VIMAGE 197 if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) { 198 CURVNET_SET_QUIET(vnet0); 199 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) 200 if (ifc->ifc_type == SIMPLE) { 201 if (ifc_simple_match(ifc, name)) 202 break; 203 } else { 204 if (ifc->ifc_match(ifc, name)) 205 break; 206 } 207 CURVNET_RESTORE(); 208 } 209#endif 210 IF_CLONERS_UNLOCK(); 211 212 if (ifc == NULL) 213 return (EINVAL); 214 215 return (if_clone_createif(ifc, name, len, params)); 216} 217 218/* 219 * Create a clone network interface. 220 */ 221static int 222if_clone_createif(struct if_clone *ifc, char *name, size_t len, caddr_t params) 223{ 224 int err; 225 struct ifnet *ifp; 226 227 if (ifunit(name) != NULL) 228 return (EEXIST); 229 230 if (ifc->ifc_type == SIMPLE) 231 err = ifc_simple_create(ifc, name, len, params); 232 else 233 err = (*ifc->ifc_create)(ifc, name, len, params); 234 235 if (!err) { 236 ifp = ifunit(name); 237 if (ifp == NULL) 238 panic("%s: lookup failed for %s", __func__, name); 239 240 if_addgroup(ifp, ifc->ifc_name); 241 242 IF_CLONE_LOCK(ifc); 243 IFC_IFLIST_INSERT(ifc, ifp); 244 IF_CLONE_UNLOCK(ifc); 245 } 246 247 return (err); 248} 249 250/* 251 * Lookup and destroy a clone network interface. 252 */ 253int 254if_clone_destroy(const char *name) 255{ 256 int err; 257 struct if_clone *ifc; 258 struct ifnet *ifp; 259 260 ifp = ifunit_ref(name); 261 if (ifp == NULL) 262 return (ENXIO); 263 264 /* Find the cloner for this interface */ 265 IF_CLONERS_LOCK(); 266 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) { 267 if (strcmp(ifc->ifc_name, ifp->if_dname) == 0) { 268 break; 269 } 270 } 271#ifdef VIMAGE 272 if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) { 273 CURVNET_SET_QUIET(vnet0); 274 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) 275 if (ifc->ifc_type == SIMPLE) { 276 if (ifc_simple_match(ifc, name)) 277 break; 278 } else { 279 if (ifc->ifc_match(ifc, name)) 280 break; 281 } 282 CURVNET_RESTORE(); 283 } 284#endif 285 IF_CLONERS_UNLOCK(); 286 if (ifc == NULL) { 287 if_rele(ifp); 288 return (EINVAL); 289 } 290 291 err = if_clone_destroyif(ifc, ifp); 292 if_rele(ifp); 293 return err; 294} 295 296/* 297 * Destroy a clone network interface. 298 */ 299int 300if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp) 301{ 302 int err; 303 struct ifnet *ifcifp; 304 305 if (ifc->ifc_type == ADVANCED && ifc->ifc_destroy == NULL) 306 return(EOPNOTSUPP); 307 308 /* 309 * Given that the cloned ifnet might be attached to a different 310 * vnet from where its cloner was registered, we have to 311 * switch to the vnet context of the target vnet. 312 */ 313 CURVNET_SET_QUIET(ifp->if_vnet); 314 315 IF_CLONE_LOCK(ifc); 316 LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) { 317 if (ifcifp == ifp) { 318 IFC_IFLIST_REMOVE(ifc, ifp); 319 break; 320 } 321 } 322 IF_CLONE_UNLOCK(ifc); 323 if (ifcifp == NULL) { 324 CURVNET_RESTORE(); 325 return (ENXIO); /* ifp is not on the list. */ 326 } 327 328 if_delgroup(ifp, ifc->ifc_name); 329 330 if (ifc->ifc_type == SIMPLE) 331 err = ifc_simple_destroy(ifc, ifp); 332 else 333 err = (*ifc->ifc_destroy)(ifc, ifp); 334 335 if (err != 0) { 336 if_addgroup(ifp, ifc->ifc_name); 337 338 IF_CLONE_LOCK(ifc); 339 IFC_IFLIST_INSERT(ifc, ifp); 340 IF_CLONE_UNLOCK(ifc); 341 } 342 CURVNET_RESTORE(); 343 return (err); 344} 345 346static struct if_clone * 347if_clone_alloc(const char *name, int maxunit) 348{ 349 struct if_clone *ifc; 350 351 KASSERT(name != NULL, ("%s: no name\n", __func__)); 352 353 ifc = malloc(sizeof(struct if_clone), M_CLONE, M_WAITOK | M_ZERO); 354 strncpy(ifc->ifc_name, name, IFCLOSIZ-1); 355 IF_CLONE_LOCK_INIT(ifc); 356 IF_CLONE_ADDREF(ifc); 357 ifc->ifc_maxunit = maxunit ? maxunit : IF_MAXUNIT; 358 ifc->ifc_unrhdr = new_unrhdr(0, ifc->ifc_maxunit, &ifc->ifc_mtx); 359 LIST_INIT(&ifc->ifc_iflist); 360 361 return (ifc); 362} 363 364static int 365if_clone_attach(struct if_clone *ifc) 366{ 367 struct if_clone *ifc1; 368 369 IF_CLONERS_LOCK(); 370 LIST_FOREACH(ifc1, &V_if_cloners, ifc_list) 371 if (strcmp(ifc->ifc_name, ifc1->ifc_name) == 0) { 372 IF_CLONERS_UNLOCK(); 373 IF_CLONE_REMREF(ifc); 374 return (EEXIST); 375 } 376 LIST_INSERT_HEAD(&V_if_cloners, ifc, ifc_list); 377 V_if_cloners_count++; 378 IF_CLONERS_UNLOCK(); 379 380 return (0); 381} 382 383struct if_clone * 384if_clone_advanced(const char *name, u_int maxunit, ifc_match_t match, 385 ifc_create_t create, ifc_destroy_t destroy) 386{ 387 struct if_clone *ifc; 388 389 ifc = if_clone_alloc(name, maxunit); 390 ifc->ifc_type = ADVANCED; 391 ifc->ifc_match = match; 392 ifc->ifc_create = create; 393 ifc->ifc_destroy = destroy; 394 395 if (if_clone_attach(ifc) != 0) { 396 if_clone_free(ifc); 397 return (NULL); 398 } 399 400 EVENTHANDLER_INVOKE(if_clone_event, ifc); 401 402 return (ifc); 403} 404 405struct if_clone * 406if_clone_simple(const char *name, ifcs_create_t create, ifcs_destroy_t destroy, 407 u_int minifs) 408{ 409 struct if_clone *ifc; 410 u_int unit; 411 412 ifc = if_clone_alloc(name, 0); 413 ifc->ifc_type = SIMPLE; 414 ifc->ifcs_create = create; 415 ifc->ifcs_destroy = destroy; 416 ifc->ifcs_minifs = minifs; 417 418 if (if_clone_attach(ifc) != 0) { 419 if_clone_free(ifc); 420 return (NULL); 421 } 422 423 for (unit = 0; unit < minifs; unit++) { 424 char name[IFNAMSIZ]; 425 int error; 426 427 snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit); 428 error = if_clone_createif(ifc, name, IFNAMSIZ, NULL); 429 KASSERT(error == 0, 430 ("%s: failed to create required interface %s", 431 __func__, name)); 432 } 433 434 EVENTHANDLER_INVOKE(if_clone_event, ifc); 435 436 return (ifc); 437} 438 439/* 440 * Unregister a network interface cloner. 441 */ 442void 443if_clone_detach(struct if_clone *ifc) 444{ 445 446 IF_CLONERS_LOCK(); 447 LIST_REMOVE(ifc, ifc_list); 448 V_if_cloners_count--; 449 IF_CLONERS_UNLOCK(); 450 451 /* Allow all simples to be destroyed */ 452 if (ifc->ifc_type == SIMPLE) 453 ifc->ifcs_minifs = 0; 454 455 /* destroy all interfaces for this cloner */ 456 while (!LIST_EMPTY(&ifc->ifc_iflist)) 457 if_clone_destroyif(ifc, LIST_FIRST(&ifc->ifc_iflist)); 458 459 IF_CLONE_REMREF(ifc); 460} 461 462static void 463if_clone_free(struct if_clone *ifc) 464{ 465 466 KASSERT(LIST_EMPTY(&ifc->ifc_iflist), 467 ("%s: ifc_iflist not empty", __func__)); 468 469 IF_CLONE_LOCK_DESTROY(ifc); 470 delete_unrhdr(ifc->ifc_unrhdr); 471 free(ifc, M_CLONE); 472} 473 474/* 475 * Provide list of interface cloners to userspace. 476 */ 477int 478if_clone_list(struct if_clonereq *ifcr) 479{ 480 char *buf, *dst, *outbuf = NULL; 481 struct if_clone *ifc; 482 int buf_count, count, err = 0; 483 484 if (ifcr->ifcr_count < 0) 485 return (EINVAL); 486 487 IF_CLONERS_LOCK(); 488 /* 489 * Set our internal output buffer size. We could end up not 490 * reporting a cloner that is added between the unlock and lock 491 * below, but that's not a major problem. Not caping our 492 * allocation to the number of cloners actually in the system 493 * could be because that would let arbitrary users cause us to 494 * allocate abritrary amounts of kernel memory. 495 */ 496 buf_count = (V_if_cloners_count < ifcr->ifcr_count) ? 497 V_if_cloners_count : ifcr->ifcr_count; 498 IF_CLONERS_UNLOCK(); 499 500 outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO); 501 502 IF_CLONERS_LOCK(); 503 504 ifcr->ifcr_total = V_if_cloners_count; 505 if ((dst = ifcr->ifcr_buffer) == NULL) { 506 /* Just asking how many there are. */ 507 goto done; 508 } 509 count = (V_if_cloners_count < buf_count) ? 510 V_if_cloners_count : buf_count; 511 512 for (ifc = LIST_FIRST(&V_if_cloners), buf = outbuf; 513 ifc != NULL && count != 0; 514 ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) { 515 strlcpy(buf, ifc->ifc_name, IFNAMSIZ); 516 } 517 518done: 519 IF_CLONERS_UNLOCK(); 520 if (err == 0) 521 err = copyout(outbuf, dst, buf_count*IFNAMSIZ); 522 if (outbuf != NULL) 523 free(outbuf, M_CLONE); 524 return (err); 525} 526 527/* 528 * if_clone_findifc() looks up ifnet from the current 529 * cloner list, and returns ifc if found. Note that ifc_refcnt 530 * is incremented. 531 */ 532struct if_clone * 533if_clone_findifc(struct ifnet *ifp) 534{ 535 struct if_clone *ifc, *ifc0; 536 struct ifnet *ifcifp; 537 538 ifc0 = NULL; 539 IF_CLONERS_LOCK(); 540 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) { 541 IF_CLONE_LOCK(ifc); 542 LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) { 543 if (ifp == ifcifp) { 544 ifc0 = ifc; 545 IF_CLONE_ADDREF_LOCKED(ifc); 546 break; 547 } 548 } 549 IF_CLONE_UNLOCK(ifc); 550 if (ifc0 != NULL) 551 break; 552 } 553 IF_CLONERS_UNLOCK(); 554 555 return (ifc0); 556} 557 558/* 559 * if_clone_addgroup() decrements ifc_refcnt because it is called after 560 * if_clone_findifc(). 561 */ 562void 563if_clone_addgroup(struct ifnet *ifp, struct if_clone *ifc) 564{ 565 566 if_addgroup(ifp, ifc->ifc_name); 567 IF_CLONE_REMREF(ifc); 568} 569 570/* 571 * A utility function to extract unit numbers from interface names of 572 * the form name###. 573 * 574 * Returns 0 on success and an error on failure. 575 */ 576int 577ifc_name2unit(const char *name, int *unit) 578{ 579 const char *cp; 580 int cutoff = INT_MAX / 10; 581 int cutlim = INT_MAX % 10; 582 583 for (cp = name; *cp != '\0' && (*cp < '0' || *cp > '9'); cp++); 584 if (*cp == '\0') { 585 *unit = -1; 586 } else if (cp[0] == '0' && cp[1] != '\0') { 587 /* Disallow leading zeroes. */ 588 return (EINVAL); 589 } else { 590 for (*unit = 0; *cp != '\0'; cp++) { 591 if (*cp < '0' || *cp > '9') { 592 /* Bogus unit number. */ 593 return (EINVAL); 594 } 595 if (*unit > cutoff || 596 (*unit == cutoff && *cp - '0' > cutlim)) 597 return (EINVAL); 598 *unit = (*unit * 10) + (*cp - '0'); 599 } 600 } 601 602 return (0); 603} 604 605static int 606ifc_alloc_unit_specific(struct if_clone *ifc, int *unit) 607{ 608 char name[IFNAMSIZ]; 609 610 if (*unit > ifc->ifc_maxunit) 611 return (ENOSPC); 612 613 if (alloc_unr_specific(ifc->ifc_unrhdr, *unit) == -1) 614 return (EEXIST); 615 616 snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, *unit); 617 if (ifunit(name) != NULL) { 618 free_unr(ifc->ifc_unrhdr, *unit); 619 return (EEXIST); 620 } 621 622 IF_CLONE_ADDREF(ifc); 623 624 return (0); 625} 626 627static int 628ifc_alloc_unit_next(struct if_clone *ifc, int *unit) 629{ 630 int error; 631 632 *unit = alloc_unr(ifc->ifc_unrhdr); 633 if (*unit == -1) 634 return (ENOSPC); 635 636 free_unr(ifc->ifc_unrhdr, *unit); 637 for (;;) { 638 error = ifc_alloc_unit_specific(ifc, unit); 639 if (error != EEXIST) 640 break; 641 642 (*unit)++; 643 } 644 645 return (error); 646} 647 648int 649ifc_alloc_unit(struct if_clone *ifc, int *unit) 650{ 651 if (*unit < 0) 652 return (ifc_alloc_unit_next(ifc, unit)); 653 else 654 return (ifc_alloc_unit_specific(ifc, unit)); 655} 656 657void 658ifc_free_unit(struct if_clone *ifc, int unit) 659{ 660 661 free_unr(ifc->ifc_unrhdr, unit); 662 IF_CLONE_REMREF(ifc); 663} 664 665static int 666ifc_simple_match(struct if_clone *ifc, const char *name) 667{ 668 const char *cp; 669 int i; 670 671 /* Match the name */ 672 for (cp = name, i = 0; i < strlen(ifc->ifc_name); i++, cp++) { 673 if (ifc->ifc_name[i] != *cp) 674 return (0); 675 } 676 677 /* Make sure there's a unit number or nothing after the name */ 678 for (; *cp != '\0'; cp++) { 679 if (*cp < '0' || *cp > '9') 680 return (0); 681 } 682 683 return (1); 684} 685 686static int 687ifc_simple_create(struct if_clone *ifc, char *name, size_t len, caddr_t params) 688{ 689 char *dp; 690 int wildcard; 691 int unit; 692 int err; 693 694 err = ifc_name2unit(name, &unit); 695 if (err != 0) 696 return (err); 697 698 wildcard = (unit < 0); 699 700 err = ifc_alloc_unit(ifc, &unit); 701 if (err != 0) 702 return (err); 703 704 err = ifc->ifcs_create(ifc, unit, params); 705 if (err != 0) { 706 ifc_free_unit(ifc, unit); 707 return (err); 708 } 709 710 /* In the wildcard case, we need to update the name. */ 711 if (wildcard) { 712 for (dp = name; *dp != '\0'; dp++); 713 if (snprintf(dp, len - (dp-name), "%d", unit) > 714 len - (dp-name) - 1) { 715 /* 716 * This can only be a programmer error and 717 * there's no straightforward way to recover if 718 * it happens. 719 */ 720 panic("if_clone_create(): interface name too long"); 721 } 722 723 } 724 725 return (0); 726} 727 728static int 729ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp) 730{ 731 int unit; 732 733 unit = ifp->if_dunit; 734 735 if (unit < ifc->ifcs_minifs) 736 return (EINVAL); 737 738 ifc->ifcs_destroy(ifp); 739 740 ifc_free_unit(ifc, unit); 741 742 return (0); 743} 744