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33 * @(#)if.c 8.3 (Berkeley) 1/4/94
34 * $FreeBSD: src/sys/net/if.c,v 1.185 2004/03/13 02:35:03 brooks Exp $
35 * $DragonFly: src/sys/net/if_clone.c,v 1.1 2008/01/11 11:59:40 sephe Exp $
38 #include <sys/param.h>
39 #include <sys/kernel.h>
40 #include <sys/malloc.h>
43 #include <net/if_clone.h>
45 static LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners);
46 static int if_cloners_count;
48 MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
50 static struct if_clone *if_clone_lookup(const char *, int *);
53 * Create a clone network interface.
56 if_clone_create(char *name, int len, caddr_t params)
60 int wildcard, bytoff, bitoff;
64 ifc = if_clone_lookup(name, &unit);
68 if (ifunit(name) != NULL)
72 wildcard = (unit < 0);
74 * Find a free unit if none was given.
77 while (bytoff < ifc->ifc_bmlen &&
78 ifc->ifc_units[bytoff] == 0xff)
80 if (bytoff >= ifc->ifc_bmlen)
82 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
84 unit = (bytoff << 3) + bitoff;
87 if (unit > ifc->ifc_maxunit)
90 err = (*ifc->ifc_create)(ifc, unit, params);
96 bitoff = unit - (bytoff << 3);
100 * Allocate the unit in the bitmap.
102 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
103 ("%s: bit is already set", __func__));
104 ifc->ifc_units[bytoff] |= (1 << bitoff);
106 /* In the wildcard case, we need to update the name. */
108 for (dp = name; *dp != '\0'; dp++);
109 if (ksnprintf(dp, len - (dp-name), "%d", unit) >
110 len - (dp-name) - 1) {
112 * This can only be a programmer error and
113 * there's no straightforward way to recover if
116 panic("if_clone_create(): interface name too long");
121 EVENTHANDLER_INVOKE(if_clone_event, ifc);
127 * Destroy a clone network interface.
130 if_clone_destroy(const char *name)
132 struct if_clone *ifc;
137 ifc = if_clone_lookup(name, &unit);
141 if (unit < ifc->ifc_minifs)
148 if (ifc->ifc_destroy == NULL)
151 (*ifc->ifc_destroy)(ifp);
154 * Compute offset in the bitmap and deallocate the unit.
157 bitoff = unit - (bytoff << 3);
158 KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
159 ("%s: bit is already cleared", __func__));
160 ifc->ifc_units[bytoff] &= ~(1 << bitoff);
165 * Register a network interface cloner.
168 if_clone_attach(struct if_clone *ifc)
175 KASSERT(ifc->ifc_minifs - 1 <= ifc->ifc_maxunit,
176 ("%s: %s requested more units then allowed (%d > %d)",
177 __func__, ifc->ifc_name, ifc->ifc_minifs,
178 ifc->ifc_maxunit + 1));
180 * Compute bitmap size and allocate it.
182 maxclone = ifc->ifc_maxunit + 1;
184 if ((len << 3) < maxclone)
186 ifc->ifc_units = kmalloc(len, M_CLONE, M_WAITOK | M_ZERO);
187 ifc->ifc_bmlen = len;
189 LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list);
192 for (unit = 0; unit < ifc->ifc_minifs; unit++) {
193 err = (*ifc->ifc_create)(ifc, unit, NULL);
195 ("%s: failed to create required interface %s%d",
196 __func__, ifc->ifc_name, unit));
198 /* Allocate the unit in the bitmap. */
200 bitoff = unit - (bytoff << 3);
201 ifc->ifc_units[bytoff] |= (1 << bitoff);
206 * Unregister a network interface cloner.
209 if_clone_detach(struct if_clone *ifc)
212 LIST_REMOVE(ifc, ifc_list);
213 kfree(ifc->ifc_units, M_CLONE);
218 * Provide list of interface cloners to userspace.
221 if_clone_list(struct if_clonereq *ifcr)
223 char outbuf[IFNAMSIZ], *dst;
224 struct if_clone *ifc;
225 int count, error = 0;
227 ifcr->ifcr_total = if_cloners_count;
228 if ((dst = ifcr->ifcr_buffer) == NULL) {
229 /* Just asking how many there are. */
233 if (ifcr->ifcr_count < 0)
236 count = (if_cloners_count < ifcr->ifcr_count) ?
237 if_cloners_count : ifcr->ifcr_count;
239 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL && count != 0;
240 ifc = LIST_NEXT(ifc, ifc_list), count--, dst += IFNAMSIZ) {
241 strlcpy(outbuf, ifc->ifc_name, IFNAMSIZ);
242 error = copyout(outbuf, dst, IFNAMSIZ);
251 * Look up a network interface cloner.
253 static struct if_clone *
254 if_clone_lookup(const char *name, int *unitp)
256 struct if_clone *ifc;
260 for (ifc = LIST_FIRST(&if_cloners); ifc != NULL;) {
261 for (cp = name, i = 0; i < ifc->ifc_namelen; i++, cp++) {
262 if (ifc->ifc_name[i] != *cp)
267 ifc = LIST_NEXT(ifc, ifc_list);
277 for (i = 0; *cp != '\0'; cp++) {
278 if (*cp < '0' || *cp > '9') {
279 /* Bogus unit number. */
282 i = (i * 10) + (*cp - '0');