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 * $FreeBSD$
32 */
33
34 #include <sys/param.h>
35 #include <sys/eventhandler.h>
36 #include <sys/malloc.h>
37 #include <sys/limits.h>
38 #include <sys/lock.h>
39 #include <sys/mutex.h>
40 #include <sys/kernel.h>
41 #include <sys/systm.h>
42 #include <sys/types.h>
43 #include <sys/socket.h>
44
45 #include <net/if.h>
46 #include <net/if_var.h>
47 #include <net/if_clone.h>
48 #include <net/radix.h>
49 #include <net/route.h>
50 #include <net/vnet.h>
51
52 /* Current IF_MAXUNIT expands maximum to 5 characters. */
53 #define IFCLOSIZ (IFNAMSIZ - 5)
54
55 /*
56 * Structure describing a `cloning' interface.
57 *
58 * List of locks
59 * (c) const until freeing
60 * (d) driver specific data, may need external protection.
61 * (e) locked by if_cloners_mtx
62 * (i) locked by ifc_mtx mtx
63 */
64 struct if_clone {
65 char ifc_name[IFCLOSIZ]; /* (c) Name of device, e.g. `gif' */
66 struct unrhdr *ifc_unrhdr; /* (c) alloc_unr(9) header */
67 int ifc_maxunit; /* (c) maximum unit number */
68 long ifc_refcnt; /* (i) Reference count. */
69 LIST_HEAD(, ifnet) ifc_iflist; /* (i) List of cloned interfaces */
70 struct mtx ifc_mtx; /* Mutex to protect members. */
71
72 enum { SIMPLE, ADVANCED } ifc_type; /* (c) */
73
74 /* (c) Driver specific cloning functions. Called with no locks held. */
75 union {
76 struct { /* advanced cloner */
77 ifc_match_t *_ifc_match;
78 ifc_create_t *_ifc_create;
79 ifc_destroy_t *_ifc_destroy;
80 } A;
81 struct { /* simple cloner */
82 ifcs_create_t *_ifcs_create;
83 ifcs_destroy_t *_ifcs_destroy;
84 int _ifcs_minifs; /* minimum ifs */
85
86 } S;
87 } U;
88 #define ifc_match U.A._ifc_match
89 #define ifc_create U.A._ifc_create
90 #define ifc_destroy U.A._ifc_destroy
91 #define ifcs_create U.S._ifcs_create
92 #define ifcs_destroy U.S._ifcs_destroy
93 #define ifcs_minifs U.S._ifcs_minifs
94
95 LIST_ENTRY(if_clone) ifc_list; /* (e) On list of cloners */
96 };
97
98 static void if_clone_free(struct if_clone *ifc);
99 static int if_clone_createif(struct if_clone *ifc, char *name, size_t len,
100 caddr_t params);
101
102 static int ifc_simple_match(struct if_clone *, const char *);
103 static int ifc_simple_create(struct if_clone *, char *, size_t, caddr_t);
104 static int ifc_simple_destroy(struct if_clone *, struct ifnet *);
105
106 static struct mtx if_cloners_mtx;
107 MTX_SYSINIT(if_cloners_lock, &if_cloners_mtx, "if_cloners lock", MTX_DEF);
108 static VNET_DEFINE(int, if_cloners_count);
109 VNET_DEFINE(LIST_HEAD(, if_clone), if_cloners);
110
111 #define V_if_cloners_count VNET(if_cloners_count)
112 #define V_if_cloners VNET(if_cloners)
113
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
162 static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
163
164 void
vnet_if_clone_init(void)165 vnet_if_clone_init(void)
166 {
167
168 LIST_INIT(&V_if_cloners);
169 }
170
171 /*
172 * Lookup and create a clone network interface.
173 */
174 int
if_clone_create(char * name,size_t len,caddr_t params)175 if_clone_create(char *name, size_t len, caddr_t params)
176 {
177 struct if_clone *ifc;
178
179 /* Try to find an applicable cloner for this request */
180 IF_CLONERS_LOCK();
181 LIST_FOREACH(ifc, &V_if_cloners, ifc_list)
182 if (ifc->ifc_type == SIMPLE) {
183 if (ifc_simple_match(ifc, name))
184 break;
185 } else {
186 if (ifc->ifc_match(ifc, name))
187 break;
188 }
189 #ifdef VIMAGE
190 if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
191 CURVNET_SET_QUIET(vnet0);
192 LIST_FOREACH(ifc, &V_if_cloners, ifc_list)
193 if (ifc->ifc_type == SIMPLE) {
194 if (ifc_simple_match(ifc, name))
195 break;
196 } else {
197 if (ifc->ifc_match(ifc, name))
198 break;
199 }
200 CURVNET_RESTORE();
201 }
202 #endif
203 IF_CLONERS_UNLOCK();
204
205 if (ifc == NULL)
206 return (EINVAL);
207
208 return (if_clone_createif(ifc, name, len, params));
209 }
210
211 void
if_clone_addif(struct if_clone * ifc,struct ifnet * ifp)212 if_clone_addif(struct if_clone *ifc, struct ifnet *ifp)
213 {
214
215 if_addgroup(ifp, ifc->ifc_name);
216
217 IF_CLONE_LOCK(ifc);
218 IFC_IFLIST_INSERT(ifc, ifp);
219 IF_CLONE_UNLOCK(ifc);
220 }
221
222 /*
223 * Create a clone network interface.
224 */
225 static int
if_clone_createif(struct if_clone * ifc,char * name,size_t len,caddr_t params)226 if_clone_createif(struct if_clone *ifc, char *name, size_t len, caddr_t params)
227 {
228 int err;
229 struct ifnet *ifp;
230
231 if (ifunit(name) != NULL)
232 return (EEXIST);
233
234 if (ifc->ifc_type == SIMPLE)
235 err = ifc_simple_create(ifc, name, len, params);
236 else
237 err = (*ifc->ifc_create)(ifc, name, len, params);
238
239 if (!err) {
240 ifp = ifunit(name);
241 if (ifp == NULL)
242 panic("%s: lookup failed for %s", __func__, name);
243
244 if_clone_addif(ifc, ifp);
245 }
246
247 return (err);
248 }
249
250 /*
251 * Lookup and destroy a clone network interface.
252 */
253 int
if_clone_destroy(const char * name)254 if_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 */
299 int
if_clone_destroyif(struct if_clone * ifc,struct ifnet * ifp)300 if_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
346 static struct if_clone *
if_clone_alloc(const char * name,int maxunit)347 if_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
364 static int
if_clone_attach(struct if_clone * ifc)365 if_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
383 struct if_clone *
if_clone_advanced(const char * name,u_int maxunit,ifc_match_t match,ifc_create_t create,ifc_destroy_t destroy)384 if_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
405 struct if_clone *
if_clone_simple(const char * name,ifcs_create_t create,ifcs_destroy_t destroy,u_int minifs)406 if_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 */
442 void
if_clone_detach(struct if_clone * ifc)443 if_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
462 static void
if_clone_free(struct if_clone * ifc)463 if_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 */
477 int
if_clone_list(struct if_clonereq * ifcr)478 if_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 arbitrary 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
518 done:
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 */
532 struct if_clone *
if_clone_findifc(struct ifnet * ifp)533 if_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 */
562 void
if_clone_addgroup(struct ifnet * ifp,struct if_clone * ifc)563 if_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 */
576 int
ifc_name2unit(const char * name,int * unit)577 ifc_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
605 static int
ifc_alloc_unit_specific(struct if_clone * ifc,int * unit)606 ifc_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
627 static int
ifc_alloc_unit_next(struct if_clone * ifc,int * unit)628 ifc_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
648 int
ifc_alloc_unit(struct if_clone * ifc,int * unit)649 ifc_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
657 void
ifc_free_unit(struct if_clone * ifc,int unit)658 ifc_free_unit(struct if_clone *ifc, int unit)
659 {
660
661 free_unr(ifc->ifc_unrhdr, unit);
662 IF_CLONE_REMREF(ifc);
663 }
664
665 static int
ifc_simple_match(struct if_clone * ifc,const char * name)666 ifc_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
686 static int
ifc_simple_create(struct if_clone * ifc,char * name,size_t len,caddr_t params)687 ifc_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
728 static int
ifc_simple_destroy(struct if_clone * ifc,struct ifnet * ifp)729 ifc_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