FreeBSD/Linux Kernel Cross Reference
sys/net/if_clone.c
1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 2012 Gleb Smirnoff <glebius@FreeBSD.org>
5 * Copyright (c) 1980, 1986, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 * @(#)if.c 8.5 (Berkeley) 1/9/95
33 * $FreeBSD$
34 */
35
36 #include <sys/param.h>
37 #include <sys/eventhandler.h>
38 #include <sys/malloc.h>
39 #include <sys/limits.h>
40 #include <sys/lock.h>
41 #include <sys/mutex.h>
42 #include <sys/kernel.h>
43 #include <sys/systm.h>
44 #include <sys/types.h>
45 #include <sys/socket.h>
46
47 #include <net/if.h>
48 #include <net/if_var.h>
49 #include <net/if_clone.h>
50 #include <net/radix.h>
51 #include <net/route.h>
52 #include <net/vnet.h>
53
54 /* Current IF_MAXUNIT expands maximum to 5 characters. */
55 #define IFCLOSIZ (IFNAMSIZ - 5)
56
57 /*
58 * Structure describing a `cloning' interface.
59 *
60 * List of locks
61 * (c) const until freeing
62 * (d) driver specific data, may need external protection.
63 * (e) locked by if_cloners_mtx
64 * (i) locked by ifc_mtx mtx
65 */
66 struct if_clone {
67 char ifc_name[IFCLOSIZ]; /* (c) Name of device, e.g. `gif' */
68 struct unrhdr *ifc_unrhdr; /* (c) alloc_unr(9) header */
69 int ifc_maxunit; /* (c) maximum unit number */
70 int ifc_flags;
71 long ifc_refcnt; /* (i) Reference count. */
72 LIST_HEAD(, ifnet) ifc_iflist; /* (i) List of cloned interfaces */
73 struct mtx ifc_mtx; /* Mutex to protect members. */
74
75 enum { SIMPLE, ADVANCED } ifc_type; /* (c) */
76
77 /* (c) Driver specific cloning functions. Called with no locks held. */
78 union {
79 struct { /* advanced cloner */
80 ifc_match_t *_ifc_match;
81 ifc_create_t *_ifc_create;
82 ifc_destroy_t *_ifc_destroy;
83 } A;
84 struct { /* simple cloner */
85 ifcs_create_t *_ifcs_create;
86 ifcs_destroy_t *_ifcs_destroy;
87 int _ifcs_minifs; /* minimum ifs */
88
89 } S;
90 } U;
91 #define ifc_match U.A._ifc_match
92 #define ifc_create U.A._ifc_create
93 #define ifc_destroy U.A._ifc_destroy
94 #define ifcs_create U.S._ifcs_create
95 #define ifcs_destroy U.S._ifcs_destroy
96 #define ifcs_minifs U.S._ifcs_minifs
97
98 LIST_ENTRY(if_clone) ifc_list; /* (e) On list of cloners */
99 };
100
101 static void if_clone_free(struct if_clone *ifc);
102 static int if_clone_createif(struct if_clone *ifc, char *name, size_t len,
103 caddr_t params);
104
105 static int ifc_simple_match(struct if_clone *, const char *);
106 static int ifc_simple_create(struct if_clone *, char *, size_t, caddr_t);
107 static int ifc_simple_destroy(struct if_clone *, struct ifnet *);
108
109 static struct mtx if_cloners_mtx;
110 MTX_SYSINIT(if_cloners_lock, &if_cloners_mtx, "if_cloners lock", MTX_DEF);
111 VNET_DEFINE_STATIC(int, if_cloners_count);
112 VNET_DEFINE(LIST_HEAD(, if_clone), if_cloners);
113
114 #define V_if_cloners_count VNET(if_cloners_count)
115 #define V_if_cloners VNET(if_cloners)
116
117 #define IF_CLONERS_LOCK_ASSERT() mtx_assert(&if_cloners_mtx, MA_OWNED)
118 #define IF_CLONERS_LOCK() mtx_lock(&if_cloners_mtx)
119 #define IF_CLONERS_UNLOCK() mtx_unlock(&if_cloners_mtx)
120
121 #define IF_CLONE_LOCK_INIT(ifc) \
122 mtx_init(&(ifc)->ifc_mtx, "if_clone lock", NULL, MTX_DEF)
123 #define IF_CLONE_LOCK_DESTROY(ifc) mtx_destroy(&(ifc)->ifc_mtx)
124 #define IF_CLONE_LOCK_ASSERT(ifc) mtx_assert(&(ifc)->ifc_mtx, MA_OWNED)
125 #define IF_CLONE_LOCK(ifc) mtx_lock(&(ifc)->ifc_mtx)
126 #define IF_CLONE_UNLOCK(ifc) mtx_unlock(&(ifc)->ifc_mtx)
127
128 #define IF_CLONE_ADDREF(ifc) \
129 do { \
130 IF_CLONE_LOCK(ifc); \
131 IF_CLONE_ADDREF_LOCKED(ifc); \
132 IF_CLONE_UNLOCK(ifc); \
133 } while (0)
134 #define IF_CLONE_ADDREF_LOCKED(ifc) \
135 do { \
136 IF_CLONE_LOCK_ASSERT(ifc); \
137 KASSERT((ifc)->ifc_refcnt >= 0, \
138 ("negative refcnt %ld", (ifc)->ifc_refcnt)); \
139 (ifc)->ifc_refcnt++; \
140 } while (0)
141 #define IF_CLONE_REMREF(ifc) \
142 do { \
143 IF_CLONE_LOCK(ifc); \
144 IF_CLONE_REMREF_LOCKED(ifc); \
145 } while (0)
146 #define IF_CLONE_REMREF_LOCKED(ifc) \
147 do { \
148 IF_CLONE_LOCK_ASSERT(ifc); \
149 KASSERT((ifc)->ifc_refcnt > 0, \
150 ("bogus refcnt %ld", (ifc)->ifc_refcnt)); \
151 if (--(ifc)->ifc_refcnt == 0) { \
152 IF_CLONE_UNLOCK(ifc); \
153 if_clone_free(ifc); \
154 } else { \
155 /* silently free the lock */ \
156 IF_CLONE_UNLOCK(ifc); \
157 } \
158 } while (0)
159
160 #define IFC_IFLIST_INSERT(_ifc, _ifp) \
161 LIST_INSERT_HEAD(&_ifc->ifc_iflist, _ifp, if_clones)
162 #define IFC_IFLIST_REMOVE(_ifc, _ifp) \
163 LIST_REMOVE(_ifp, if_clones)
164
165 static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
166
167 void
168 vnet_if_clone_init(void)
169 {
170
171 LIST_INIT(&V_if_cloners);
172 }
173
174 /*
175 * Lookup and create a clone network interface.
176 */
177 int
178 if_clone_create(char *name, size_t len, caddr_t params)
179 {
180 struct if_clone *ifc;
181
182 /* Try to find an applicable cloner for this request */
183 IF_CLONERS_LOCK();
184 LIST_FOREACH(ifc, &V_if_cloners, ifc_list)
185 if (ifc->ifc_type == SIMPLE) {
186 if (ifc_simple_match(ifc, name))
187 break;
188 } else {
189 if (ifc->ifc_match(ifc, name))
190 break;
191 }
192 #ifdef VIMAGE
193 if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
194 CURVNET_SET_QUIET(vnet0);
195 LIST_FOREACH(ifc, &V_if_cloners, ifc_list)
196 if (ifc->ifc_type == SIMPLE) {
197 if (ifc_simple_match(ifc, name))
198 break;
199 } else {
200 if (ifc->ifc_match(ifc, name))
201 break;
202 }
203 CURVNET_RESTORE();
204 }
205 #endif
206 IF_CLONERS_UNLOCK();
207
208 if (ifc == NULL)
209 return (EINVAL);
210
211 return (if_clone_createif(ifc, name, len, params));
212 }
213
214 void
215 if_clone_addif(struct if_clone *ifc, struct ifnet *ifp)
216 {
217
218 if ((ifc->ifc_flags & IFC_NOGROUP) == 0)
219 if_addgroup(ifp, ifc->ifc_name);
220
221 IF_CLONE_LOCK(ifc);
222 IFC_IFLIST_INSERT(ifc, ifp);
223 IF_CLONE_UNLOCK(ifc);
224 }
225
226 /*
227 * Create a clone network interface.
228 */
229 static int
230 if_clone_createif(struct if_clone *ifc, char *name, size_t len, caddr_t params)
231 {
232 int err;
233 struct ifnet *ifp;
234
235 if (ifunit(name) != NULL)
236 return (EEXIST);
237
238 if (ifc->ifc_type == SIMPLE)
239 err = ifc_simple_create(ifc, name, len, params);
240 else
241 err = (*ifc->ifc_create)(ifc, name, len, params);
242
243 if (!err) {
244 ifp = ifunit(name);
245 if (ifp == NULL)
246 panic("%s: lookup failed for %s", __func__, name);
247
248 if_clone_addif(ifc, ifp);
249 }
250
251 return (err);
252 }
253
254 /*
255 * Lookup and destroy a clone network interface.
256 */
257 int
258 if_clone_destroy(const char *name)
259 {
260 int err;
261 struct if_clone *ifc;
262 struct ifnet *ifp;
263
264 ifp = ifunit_ref(name);
265 if (ifp == NULL)
266 return (ENXIO);
267
268 /* Find the cloner for this interface */
269 IF_CLONERS_LOCK();
270 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
271 if (strcmp(ifc->ifc_name, ifp->if_dname) == 0) {
272 break;
273 }
274 }
275 #ifdef VIMAGE
276 if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
277 CURVNET_SET_QUIET(vnet0);
278 LIST_FOREACH(ifc, &V_if_cloners, ifc_list)
279 if (ifc->ifc_type == SIMPLE) {
280 if (ifc_simple_match(ifc, name))
281 break;
282 } else {
283 if (ifc->ifc_match(ifc, name))
284 break;
285 }
286 CURVNET_RESTORE();
287 }
288 #endif
289 IF_CLONERS_UNLOCK();
290 if (ifc == NULL) {
291 if_rele(ifp);
292 return (EINVAL);
293 }
294
295 err = if_clone_destroyif(ifc, ifp);
296 if_rele(ifp);
297 return err;
298 }
299
300 /*
301 * Destroy a clone network interface.
302 */
303 int
304 if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp)
305 {
306 int err;
307 struct ifnet *ifcifp;
308
309 if (ifc->ifc_type == ADVANCED && ifc->ifc_destroy == NULL)
310 return(EOPNOTSUPP);
311
312 /*
313 * Given that the cloned ifnet might be attached to a different
314 * vnet from where its cloner was registered, we have to
315 * switch to the vnet context of the target vnet.
316 */
317 CURVNET_SET_QUIET(ifp->if_vnet);
318
319 IF_CLONE_LOCK(ifc);
320 LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
321 if (ifcifp == ifp) {
322 IFC_IFLIST_REMOVE(ifc, ifp);
323 break;
324 }
325 }
326 IF_CLONE_UNLOCK(ifc);
327 if (ifcifp == NULL) {
328 CURVNET_RESTORE();
329 return (ENXIO); /* ifp is not on the list. */
330 }
331 if ((ifc->ifc_flags & IFC_NOGROUP) == 0)
332 if_delgroup(ifp, ifc->ifc_name);
333
334 if (ifc->ifc_type == SIMPLE)
335 err = ifc_simple_destroy(ifc, ifp);
336 else
337 err = (*ifc->ifc_destroy)(ifc, ifp);
338
339 if (err != 0) {
340 if ((ifc->ifc_flags & IFC_NOGROUP) == 0)
341 if_addgroup(ifp, ifc->ifc_name);
342
343 IF_CLONE_LOCK(ifc);
344 IFC_IFLIST_INSERT(ifc, ifp);
345 IF_CLONE_UNLOCK(ifc);
346 }
347 CURVNET_RESTORE();
348 return (err);
349 }
350
351 static struct if_clone *
352 if_clone_alloc(const char *name, int maxunit)
353 {
354 struct if_clone *ifc;
355
356 KASSERT(name != NULL, ("%s: no name\n", __func__));
357
358 ifc = malloc(sizeof(struct if_clone), M_CLONE, M_WAITOK | M_ZERO);
359 strncpy(ifc->ifc_name, name, IFCLOSIZ-1);
360 IF_CLONE_LOCK_INIT(ifc);
361 IF_CLONE_ADDREF(ifc);
362 ifc->ifc_maxunit = maxunit ? maxunit : IF_MAXUNIT;
363 ifc->ifc_unrhdr = new_unrhdr(0, ifc->ifc_maxunit, &ifc->ifc_mtx);
364 LIST_INIT(&ifc->ifc_iflist);
365
366 return (ifc);
367 }
368
369 static int
370 if_clone_attach(struct if_clone *ifc)
371 {
372 struct if_clone *ifc1;
373
374 IF_CLONERS_LOCK();
375 LIST_FOREACH(ifc1, &V_if_cloners, ifc_list)
376 if (strcmp(ifc->ifc_name, ifc1->ifc_name) == 0) {
377 IF_CLONERS_UNLOCK();
378 IF_CLONE_REMREF(ifc);
379 return (EEXIST);
380 }
381 LIST_INSERT_HEAD(&V_if_cloners, ifc, ifc_list);
382 V_if_cloners_count++;
383 IF_CLONERS_UNLOCK();
384
385 return (0);
386 }
387
388 struct if_clone *
389 if_clone_advanced(const char *name, u_int maxunit, ifc_match_t match,
390 ifc_create_t create, ifc_destroy_t destroy)
391 {
392 struct if_clone *ifc;
393
394 ifc = if_clone_alloc(name, maxunit);
395 ifc->ifc_type = ADVANCED;
396 ifc->ifc_match = match;
397 ifc->ifc_create = create;
398 ifc->ifc_destroy = destroy;
399
400 if (if_clone_attach(ifc) != 0)
401 return (NULL);
402
403 EVENTHANDLER_INVOKE(if_clone_event, ifc);
404
405 return (ifc);
406 }
407
408 struct if_clone *
409 if_clone_simple(const char *name, ifcs_create_t create, ifcs_destroy_t destroy,
410 u_int minifs)
411 {
412 struct if_clone *ifc;
413 u_int unit;
414
415 ifc = if_clone_alloc(name, 0);
416 ifc->ifc_type = SIMPLE;
417 ifc->ifcs_create = create;
418 ifc->ifcs_destroy = destroy;
419 ifc->ifcs_minifs = minifs;
420
421 if (if_clone_attach(ifc) != 0)
422 return (NULL);
423
424 for (unit = 0; unit < minifs; unit++) {
425 char name[IFNAMSIZ];
426 int error __unused;
427
428 snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit);
429 error = if_clone_createif(ifc, name, IFNAMSIZ, NULL);
430 KASSERT(error == 0,
431 ("%s: failed to create required interface %s",
432 __func__, name));
433 }
434
435 EVENTHANDLER_INVOKE(if_clone_event, ifc);
436
437 return (ifc);
438 }
439
440 /*
441 * Unregister a network interface cloner.
442 */
443 void
444 if_clone_detach(struct if_clone *ifc)
445 {
446
447 IF_CLONERS_LOCK();
448 LIST_REMOVE(ifc, ifc_list);
449 V_if_cloners_count--;
450 IF_CLONERS_UNLOCK();
451
452 /* Allow all simples to be destroyed */
453 if (ifc->ifc_type == SIMPLE)
454 ifc->ifcs_minifs = 0;
455
456 /* destroy all interfaces for this cloner */
457 while (!LIST_EMPTY(&ifc->ifc_iflist))
458 if_clone_destroyif(ifc, LIST_FIRST(&ifc->ifc_iflist));
459
460 IF_CLONE_REMREF(ifc);
461 }
462
463 static void
464 if_clone_free(struct if_clone *ifc)
465 {
466
467 KASSERT(LIST_EMPTY(&ifc->ifc_iflist),
468 ("%s: ifc_iflist not empty", __func__));
469
470 IF_CLONE_LOCK_DESTROY(ifc);
471 delete_unrhdr(ifc->ifc_unrhdr);
472 free(ifc, M_CLONE);
473 }
474
475 /*
476 * Provide list of interface cloners to userspace.
477 */
478 int
479 if_clone_list(struct if_clonereq *ifcr)
480 {
481 char *buf, *dst, *outbuf = NULL;
482 struct if_clone *ifc;
483 int buf_count, count, err = 0;
484
485 if (ifcr->ifcr_count < 0)
486 return (EINVAL);
487
488 IF_CLONERS_LOCK();
489 /*
490 * Set our internal output buffer size. We could end up not
491 * reporting a cloner that is added between the unlock and lock
492 * below, but that's not a major problem. Not caping our
493 * allocation to the number of cloners actually in the system
494 * could be because that would let arbitrary users cause us to
495 * allocate arbitrary amounts of kernel memory.
496 */
497 buf_count = (V_if_cloners_count < ifcr->ifcr_count) ?
498 V_if_cloners_count : ifcr->ifcr_count;
499 IF_CLONERS_UNLOCK();
500
501 outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO);
502
503 IF_CLONERS_LOCK();
504
505 ifcr->ifcr_total = V_if_cloners_count;
506 if ((dst = ifcr->ifcr_buffer) == NULL) {
507 /* Just asking how many there are. */
508 goto done;
509 }
510 count = (V_if_cloners_count < buf_count) ?
511 V_if_cloners_count : buf_count;
512
513 for (ifc = LIST_FIRST(&V_if_cloners), buf = outbuf;
514 ifc != NULL && count != 0;
515 ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) {
516 strlcpy(buf, ifc->ifc_name, IFNAMSIZ);
517 }
518
519 done:
520 IF_CLONERS_UNLOCK();
521 if (err == 0 && dst != NULL)
522 err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
523 if (outbuf != NULL)
524 free(outbuf, M_CLONE);
525 return (err);
526 }
527
528 /*
529 * if_clone_findifc() looks up ifnet from the current
530 * cloner list, and returns ifc if found. Note that ifc_refcnt
531 * is incremented.
532 */
533 struct if_clone *
534 if_clone_findifc(struct ifnet *ifp)
535 {
536 struct if_clone *ifc, *ifc0;
537 struct ifnet *ifcifp;
538
539 ifc0 = NULL;
540 IF_CLONERS_LOCK();
541 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
542 IF_CLONE_LOCK(ifc);
543 LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
544 if (ifp == ifcifp) {
545 ifc0 = ifc;
546 IF_CLONE_ADDREF_LOCKED(ifc);
547 break;
548 }
549 }
550 IF_CLONE_UNLOCK(ifc);
551 if (ifc0 != NULL)
552 break;
553 }
554 IF_CLONERS_UNLOCK();
555
556 return (ifc0);
557 }
558
559 /*
560 * if_clone_addgroup() decrements ifc_refcnt because it is called after
561 * if_clone_findifc().
562 */
563 void
564 if_clone_addgroup(struct ifnet *ifp, struct if_clone *ifc)
565 {
566 if ((ifc->ifc_flags & IFC_NOGROUP) == 0) {
567 if_addgroup(ifp, ifc->ifc_name);
568 IF_CLONE_REMREF(ifc);
569 }
570 }
571
572 /*
573 * A utility function to extract unit numbers from interface names of
574 * the form name###.
575 *
576 * Returns 0 on success and an error on failure.
577 */
578 int
579 ifc_name2unit(const char *name, int *unit)
580 {
581 const char *cp;
582 int cutoff = INT_MAX / 10;
583 int cutlim = INT_MAX % 10;
584
585 for (cp = name; *cp != '\0' && (*cp < '' || *cp > '9'); cp++);
586 if (*cp == '\0') {
587 *unit = -1;
588 } else if (cp[0] == '' && cp[1] != '\0') {
589 /* Disallow leading zeroes. */
590 return (EINVAL);
591 } else {
592 for (*unit = 0; *cp != '\0'; cp++) {
593 if (*cp < '' || *cp > '9') {
594 /* Bogus unit number. */
595 return (EINVAL);
596 }
597 if (*unit > cutoff ||
598 (*unit == cutoff && *cp - '' > cutlim))
599 return (EINVAL);
600 *unit = (*unit * 10) + (*cp - '');
601 }
602 }
603
604 return (0);
605 }
606
607 static int
608 ifc_alloc_unit_specific(struct if_clone *ifc, int *unit)
609 {
610 char name[IFNAMSIZ];
611
612 if (*unit > ifc->ifc_maxunit)
613 return (ENOSPC);
614
615 if (alloc_unr_specific(ifc->ifc_unrhdr, *unit) == -1)
616 return (EEXIST);
617
618 snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, *unit);
619 if (ifunit(name) != NULL) {
620 free_unr(ifc->ifc_unrhdr, *unit);
621 return (EEXIST);
622 }
623
624 IF_CLONE_ADDREF(ifc);
625
626 return (0);
627 }
628
629 static int
630 ifc_alloc_unit_next(struct if_clone *ifc, int *unit)
631 {
632 int error;
633
634 *unit = alloc_unr(ifc->ifc_unrhdr);
635 if (*unit == -1)
636 return (ENOSPC);
637
638 free_unr(ifc->ifc_unrhdr, *unit);
639 for (;;) {
640 error = ifc_alloc_unit_specific(ifc, unit);
641 if (error != EEXIST)
642 break;
643
644 (*unit)++;
645 }
646
647 return (error);
648 }
649
650 int
651 ifc_alloc_unit(struct if_clone *ifc, int *unit)
652 {
653 if (*unit < 0)
654 return (ifc_alloc_unit_next(ifc, unit));
655 else
656 return (ifc_alloc_unit_specific(ifc, unit));
657 }
658
659 void
660 ifc_free_unit(struct if_clone *ifc, int unit)
661 {
662
663 free_unr(ifc->ifc_unrhdr, unit);
664 IF_CLONE_REMREF(ifc);
665 }
666
667 static int
668 ifc_simple_match(struct if_clone *ifc, const char *name)
669 {
670 const char *cp;
671 int i;
672
673 /* Match the name */
674 for (cp = name, i = 0; i < strlen(ifc->ifc_name); i++, cp++) {
675 if (ifc->ifc_name[i] != *cp)
676 return (0);
677 }
678
679 /* Make sure there's a unit number or nothing after the name */
680 for (; *cp != '\0'; cp++) {
681 if (*cp < '' || *cp > '9')
682 return (0);
683 }
684
685 return (1);
686 }
687
688 static int
689 ifc_simple_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
690 {
691 char *dp;
692 int wildcard;
693 int unit;
694 int err;
695
696 err = ifc_name2unit(name, &unit);
697 if (err != 0)
698 return (err);
699
700 wildcard = (unit < 0);
701
702 err = ifc_alloc_unit(ifc, &unit);
703 if (err != 0)
704 return (err);
705
706 err = ifc->ifcs_create(ifc, unit, params);
707 if (err != 0) {
708 ifc_free_unit(ifc, unit);
709 return (err);
710 }
711
712 /* In the wildcard case, we need to update the name. */
713 if (wildcard) {
714 for (dp = name; *dp != '\0'; dp++);
715 if (snprintf(dp, len - (dp-name), "%d", unit) >
716 len - (dp-name) - 1) {
717 /*
718 * This can only be a programmer error and
719 * there's no straightforward way to recover if
720 * it happens.
721 */
722 panic("if_clone_create(): interface name too long");
723 }
724
725 }
726
727 return (0);
728 }
729
730 static int
731 ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp)
732 {
733 int unit;
734
735 unit = ifp->if_dunit;
736
737 if (unit < ifc->ifcs_minifs)
738 return (EINVAL);
739
740 ifc->ifcs_destroy(ifp);
741
742 ifc_free_unit(ifc, unit);
743
744 return (0);
745 }
746
747 const char *
748 ifc_name(struct if_clone *ifc)
749 {
750 return (ifc->ifc_name);
751 }
752
753 void
754 ifc_flags_set(struct if_clone *ifc, int flags)
755 {
756 ifc->ifc_flags = flags;
757 }
758
759 int
760 ifc_flags_get(struct if_clone *ifc)
761 {
762 return (ifc->ifc_flags);
763 }
Cache object: a6df1cd9c9f4b4fed7ad04fdb40d98f2
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