2 * Copyright (c) 1980, 1986, 1993
3 * The Regents of the University of California. All rights reserved.
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6 * modification, are permitted provided that the following conditions
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.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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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
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29 * @(#)if.c 8.5 (Berkeley) 1/9/95
33 #include <sys/param.h>
34 #include <sys/malloc.h>
36 #include <sys/mutex.h>
37 #include <sys/kernel.h>
38 #include <sys/systm.h>
39 #include <sys/types.h>
40 #include <sys/socket.h>
43 #include <net/if_clone.h>
45 #include <net/if_dl.h>
47 #include <net/if_types.h>
48 #include <net/if_var.h>
49 #include <net/radix.h>
50 #include <net/route.h>
52 static void if_clone_free(struct if_clone *ifc);
54 static struct mtx if_cloners_mtx;
55 static int if_cloners_count;
56 LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
58 #define IF_CLONERS_LOCK_INIT() \
59 mtx_init(&if_cloners_mtx, "if_cloners lock", NULL, MTX_DEF)
60 #define IF_CLONERS_LOCK_ASSERT() mtx_assert(&if_cloners_mtx, MA_OWNED)
61 #define IF_CLONERS_LOCK() mtx_lock(&if_cloners_mtx)
62 #define IF_CLONERS_UNLOCK() mtx_unlock(&if_cloners_mtx)
64 #define IF_CLONE_LOCK_INIT(ifc) \
65 mtx_init(&(ifc)->ifc_mtx, "if_clone lock", NULL, MTX_DEF)
66 #define IF_CLONE_LOCK_DESTROY(ifc) mtx_destroy(&(ifc)->ifc_mtx)
67 #define IF_CLONE_LOCK_ASSERT(ifc) mtx_assert(&(ifc)->ifc_mtx, MA_OWNED)
68 #define IF_CLONE_LOCK(ifc) mtx_lock(&(ifc)->ifc_mtx)
69 #define IF_CLONE_UNLOCK(ifc) mtx_unlock(&(ifc)->ifc_mtx)
71 #define IF_CLONE_ADDREF(ifc) \
74 IF_CLONE_ADDREF_LOCKED(ifc); \
75 IF_CLONE_UNLOCK(ifc); \
77 #define IF_CLONE_ADDREF_LOCKED(ifc) \
79 IF_CLONE_LOCK_ASSERT(ifc); \
80 KASSERT((ifc)->ifc_refcnt >= 0, \
81 ("negative refcnt %ld", (ifc)->ifc_refcnt)); \
82 (ifc)->ifc_refcnt++; \
84 #define IF_CLONE_REMREF(ifc) \
87 IF_CLONE_REMREF_LOCKED(ifc); \
89 #define IF_CLONE_REMREF_LOCKED(ifc) \
91 IF_CLONE_LOCK_ASSERT(ifc); \
92 KASSERT((ifc)->ifc_refcnt > 0, \
93 ("bogus refcnt %ld", (ifc)->ifc_refcnt)); \
94 if (--(ifc)->ifc_refcnt == 0) { \
95 IF_CLONE_UNLOCK(ifc); \
98 /* silently free the lock */ \
99 IF_CLONE_UNLOCK(ifc); \
103 static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
108 IF_CLONERS_LOCK_INIT();
112 * Create a clone network interface.
115 if_clone_create(char *name, size_t len)
118 struct if_clone *ifc;
120 if (ifunit(name) != NULL)
123 /* Try to find an applicable cloner for this request */
125 LIST_FOREACH(ifc, &if_cloners, ifc_list) {
126 if (ifc->ifc_match(ifc, name)) {
127 IF_CLONE_ADDREF(ifc);
136 err = (*ifc->ifc_create)(ifc, name, len);
137 IF_CLONE_REMREF(ifc);
142 * Destroy a clone network interface.
145 if_clone_destroy(const char *name)
148 struct if_clone *ifc;
155 /* Find the cloner for this interface */
157 LIST_FOREACH(ifc, &if_cloners, ifc_list) {
158 if (strcmp(ifc->ifc_name, ifp->if_dname) == 0) {
159 IF_CLONE_ADDREF(ifc);
167 if (ifc->ifc_destroy == NULL) {
172 err = (*ifc->ifc_destroy)(ifc, ifp);
175 IF_CLONE_REMREF(ifc);
180 * Register a network interface cloner.
183 if_clone_attach(struct if_clone *ifc)
188 * Compute bitmap size and allocate it.
190 maxclone = ifc->ifc_maxunit + 1;
192 if ((len << 3) < maxclone)
194 ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
195 ifc->ifc_bmlen = len;
196 IF_CLONE_LOCK_INIT(ifc);
197 IF_CLONE_ADDREF(ifc);
200 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
204 if (ifc->ifc_attach != NULL)
205 (*ifc->ifc_attach)(ifc);
206 EVENTHANDLER_INVOKE(if_clone_event, ifc);
210 * Unregister a network interface cloner.
213 if_clone_detach(struct if_clone *ifc)
217 LIST_REMOVE(ifc, ifc_list);
221 IF_CLONE_REMREF(ifc);
225 if_clone_free(struct if_clone *ifc)
228 IF_CLONE_LOCK_DESTROY(ifc);
229 free(ifc->ifc_units, M_CLONE);
233 * Provide list of interface cloners to userspace.
236 if_clone_list(struct if_clonereq *ifcr)
238 char *buf, *dst, *outbuf = NULL;
239 struct if_clone *ifc;
240 int buf_count, count, err = 0;
242 if (ifcr->ifcr_count < 0)
247 * Set our internal output buffer size. We could end up not
248 * reporting a cloner that is added between the unlock and lock
249 * below, but that's not a major problem. Not caping our
250 * allocation to the number of cloners actually in the system
251 * could be because that would let arbitrary users cause us to
252 * allocate abritrary amounts of kernel memory.
254 buf_count = (if_cloners_count < ifcr->ifcr_count) ?
255 if_cloners_count : ifcr->ifcr_count;
258 outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO);
262 ifcr->ifcr_total = if_cloners_count;
263 if ((dst = ifcr->ifcr_buffer) == NULL) {
264 /* Just asking how many there are. */
267 count = (if_cloners_count < buf_count) ?
268 if_cloners_count : buf_count;
270 for (ifc = LIST_FIRST(&if_cloners), buf = outbuf;
271 ifc != NULL && count != 0;
272 ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) {
273 strlcpy(buf, ifc->ifc_name, IFNAMSIZ);
279 err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
281 free(outbuf, M_CLONE);
286 * A utility function to extract unit numbers from interface names of
289 * Returns 0 on success and an error on failure.
292 ifc_name2unit(const char *name, int *unit)
296 for (cp = name; *cp != '\0' && (*cp < '0' || *cp > '9'); cp++);
300 for (*unit = 0; *cp != '\0'; cp++) {
301 if (*cp < '0' || *cp > '9') {
302 /* Bogus unit number. */
305 *unit = (*unit * 10) + (*cp - '0');
313 ifc_alloc_unit(struct if_clone *ifc, int *unit)
315 int wildcard, bytoff, bitoff;
321 wildcard = (*unit < 0);
323 * Find a free unit if none was given.
326 while ((bytoff < ifc->ifc_bmlen)
327 && (ifc->ifc_units[bytoff] == 0xff))
329 if (bytoff >= ifc->ifc_bmlen) {
333 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
335 *unit = (bytoff << 3) + bitoff;
338 if (*unit > ifc->ifc_maxunit) {
345 bitoff = *unit - (bytoff << 3);
348 if((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) {
353 * Allocate the unit in the bitmap.
355 ifc->ifc_units[bytoff] |= (1 << bitoff);
358 IF_CLONE_UNLOCK(ifc);
363 ifc_free_unit(struct if_clone *ifc, int unit)
369 * Compute offset in the bitmap and deallocate the unit.
372 bitoff = unit - (bytoff << 3);
375 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
376 ("%s: bit is already cleared", __func__));
377 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
378 IF_CLONE_UNLOCK(ifc);
382 ifc_simple_attach(struct if_clone *ifc)
387 struct ifc_simple_data *ifcs = ifc->ifc_data;
389 KASSERT(ifcs->ifcs_minifs - 1 <= ifc->ifc_maxunit,
390 ("%s: %s requested more units then allowed (%d > %d)",
391 __func__, ifc->ifc_name, ifcs->ifcs_minifs,
392 ifc->ifc_maxunit + 1));
394 for (unit = 0; unit < ifcs->ifcs_minifs; unit++) {
395 snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit);
396 err = (*ifc->ifc_create)(ifc, name, IFNAMSIZ);
398 ("%s: failed to create required interface %s",
404 ifc_simple_match(struct if_clone *ifc, const char *name)
410 for (cp = name, i = 0; i < strlen(ifc->ifc_name); i++, cp++) {
411 if (ifc->ifc_name[i] != *cp)
415 /* Make sure there's a unit number or nothing after the name */
416 for (; *cp != '\0'; cp++) {
417 if (*cp < '0' || *cp > '9')
425 ifc_simple_create(struct if_clone *ifc, char *name, size_t len)
431 struct ifc_simple_data *ifcs = ifc->ifc_data;
433 err = ifc_name2unit(name, &unit);
437 wildcard = (unit < 0);
439 err = ifc_alloc_unit(ifc, &unit);
443 err = ifcs->ifcs_create(ifc, unit);
445 ifc_free_unit(ifc, unit);
449 /* In the wildcard case, we need to update the name. */
451 for (dp = name; *dp != '\0'; dp++);
452 if (snprintf(dp, len - (dp-name), "%d", unit) >
453 len - (dp-name) - 1) {
455 * This can only be a programmer error and
456 * there's no straightforward way to recover if
459 panic("if_clone_create(): interface name too long");
468 ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp)
471 struct ifc_simple_data *ifcs = ifc->ifc_data;
473 unit = ifp->if_dunit;
475 if (unit < ifcs->ifcs_minifs)
478 ifcs->ifcs_destroy(ifp);
480 ifc_free_unit(ifc, unit);