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29 * @(#)if.c 8.3 (Berkeley) 1/4/94
30 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
31 * $DragonFly: src/sys/net/if_clone.c,v 1.1 2008/01/11 11:59:40 sephe Exp $
34 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
39 #include <net/if_var.h>
40 #include <net/if_clone.h>
42 static LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
43 static int if_cloners_count;
45 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
47 static struct if_clone *if_clone_lookup(const char *, int *);
50 * Create a clone network interface.
53 if_clone_create(char *name, int len, caddr_t params)
57 int wildcard, bytoff, bitoff;
61 ifc = if_clone_lookup(name, &unit);
66 if (ifunit(name) != NULL) {
73 wildcard = (unit < 0);
75 * Find a free unit if none was given.
78 while (bytoff < ifc->ifc_bmlen &&
79 ifc->ifc_units[bytoff] == 0xff)
81 if (bytoff >= ifc->ifc_bmlen)
83 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
85 unit = (bytoff << 3) + bitoff;
88 if (unit > ifc->ifc_maxunit)
91 err = (*ifc->ifc_create)(ifc, unit, params);
97 bitoff = unit - (bytoff << 3);
101 * Allocate the unit in the bitmap.
103 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
104 ("%s: bit is already set", __func__));
105 ifc->ifc_units[bytoff] |= (1 << bitoff);
107 /* In the wildcard case, we need to update the name. */
109 for (dp = name; *dp != '\0'; dp++);
110 if (ksnprintf(dp, len - (dp-name), "%d", unit) >
111 len - (dp-name) - 1) {
113 * This can only be a programmer error and
114 * there's no straightforward way to recover if
117 panic("if_clone_create(): interface name too long");
122 EVENTHANDLER_INVOKE(if_clone_event, ifc);
128 * Destroy a clone network interface.
131 if_clone_destroy(const char *name)
133 struct if_clone *ifc;
138 ifc = if_clone_lookup(name, &unit);
142 if (unit < ifc->ifc_minifs)
153 if (ifc->ifc_destroy == NULL) {
158 error = ifc->ifc_destroy(ifp);
167 * Compute offset in the bitmap and deallocate the unit.
170 bitoff = unit - (bytoff << 3);
171 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
172 ("%s: bit is already cleared", __func__));
173 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
178 * Register a network interface cloner.
181 if_clone_attach(struct if_clone *ifc)
187 struct if_clone *ifct;
189 /* Duplicate entries in if_cloners lead
190 to infinite loops in if_clone_create */
191 LIST_FOREACH(ifct, &if_cloners, ifc_list) {
193 panic("%s: duplicate entry %s\n",
194 __func__, ifc->ifc_name);
198 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
199 ("%s: %s requested more units then allowed (%d > %d)",
200 __func__, ifc->ifc_name, ifc->ifc_minifs,
201 ifc->ifc_maxunit + 1));
203 * Compute bitmap size and allocate it.
205 maxclone = ifc->ifc_maxunit + 1;
207 if ((len << 3) < maxclone)
209 ifc->ifc_units = kmalloc(len, M_CLONE, M_WAITOK | M_ZERO);
210 ifc->ifc_bmlen = len;
212 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
215 for (unit = 0; unit < ifc->ifc_minifs; unit++) {
216 err = (*ifc->ifc_create)(ifc, unit, NULL);
218 ("%s: failed to create required interface %s%d",
219 __func__, ifc->ifc_name, unit));
221 /* Allocate the unit in the bitmap. */
223 bitoff = unit - (bytoff << 3);
224 ifc->ifc_units[bytoff] |= (1 << bitoff);
229 * Unregister a network interface cloner.
232 if_clone_detach(struct if_clone *ifc)
235 LIST_REMOVE(ifc, ifc_list);
236 kfree(ifc->ifc_units, M_CLONE);
241 * Provide list of interface cloners to userspace.
244 if_clone_list(struct if_clonereq *ifcr)
246 char outbuf[IFNAMSIZ], *dst;
247 struct if_clone *ifc;
248 int count, error = 0;
250 ifcr->ifcr_total = if_cloners_count;
251 if ((dst = ifcr->ifcr_buffer) == NULL) {
252 /* Just asking how many there are. */
256 if (ifcr->ifcr_count < 0)
259 count = (if_cloners_count < ifcr->ifcr_count) ?
260 if_cloners_count : ifcr->ifcr_count;
262 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
263 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
264 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
265 error = copyout(outbuf, dst, IFNAMSIZ);
274 * Look up a network interface cloner.
276 static struct if_clone *
277 if_clone_lookup(const char *name, int *unitp)
279 struct if_clone *ifc;
283 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
284 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
285 if (ifc->ifc_name[i] != *cp)
290 ifc = LIST_NEXT(ifc, ifc_list);
300 for (i = 0; *cp != '\0'; cp++) {
301 if (*cp < '0' || *cp > '9') {
302 /* Bogus unit number. */
305 i = (i * 10) + (*cp - '0');