1c398230bSWarner Losh /*- 2f889d2efSBrooks Davis * Copyright (c) 1980, 1986, 1993 3f889d2efSBrooks Davis * The Regents of the University of California. All rights reserved. 4f889d2efSBrooks Davis * 5f889d2efSBrooks Davis * Redistribution and use in source and binary forms, with or without 6f889d2efSBrooks Davis * modification, are permitted provided that the following conditions 7f889d2efSBrooks Davis * are met: 8f889d2efSBrooks Davis * 1. Redistributions of source code must retain the above copyright 9f889d2efSBrooks Davis * notice, this list of conditions and the following disclaimer. 10f889d2efSBrooks Davis * 2. Redistributions in binary form must reproduce the above copyright 11f889d2efSBrooks Davis * notice, this list of conditions and the following disclaimer in the 12f889d2efSBrooks Davis * documentation and/or other materials provided with the distribution. 13f889d2efSBrooks Davis * 4. Neither the name of the University nor the names of its contributors 14f889d2efSBrooks Davis * may be used to endorse or promote products derived from this software 15f889d2efSBrooks Davis * without specific prior written permission. 16f889d2efSBrooks Davis * 17f889d2efSBrooks Davis * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18f889d2efSBrooks Davis * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19f889d2efSBrooks Davis * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20f889d2efSBrooks Davis * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21f889d2efSBrooks Davis * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22f889d2efSBrooks Davis * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23f889d2efSBrooks Davis * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24f889d2efSBrooks Davis * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25f889d2efSBrooks Davis * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26f889d2efSBrooks Davis * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27f889d2efSBrooks Davis * SUCH DAMAGE. 28f889d2efSBrooks Davis * 29f889d2efSBrooks Davis * @(#)if.c 8.5 (Berkeley) 1/9/95 30f889d2efSBrooks Davis * $FreeBSD$ 31f889d2efSBrooks Davis */ 32f889d2efSBrooks Davis 33f889d2efSBrooks Davis #include <sys/param.h> 34f889d2efSBrooks Davis #include <sys/malloc.h> 35f889d2efSBrooks Davis #include <sys/lock.h> 36f889d2efSBrooks Davis #include <sys/mutex.h> 37f889d2efSBrooks Davis #include <sys/kernel.h> 38f889d2efSBrooks Davis #include <sys/systm.h> 39f889d2efSBrooks Davis #include <sys/types.h> 40f889d2efSBrooks Davis #include <sys/socket.h> 41f889d2efSBrooks Davis 42f889d2efSBrooks Davis #include <net/if.h> 43f889d2efSBrooks Davis #include <net/if_clone.h> 44f889d2efSBrooks Davis #if 0 45f889d2efSBrooks Davis #include <net/if_dl.h> 46f889d2efSBrooks Davis #endif 47f889d2efSBrooks Davis #include <net/if_types.h> 48f889d2efSBrooks Davis #include <net/if_var.h> 49f889d2efSBrooks Davis #include <net/radix.h> 50f889d2efSBrooks Davis #include <net/route.h> 51f889d2efSBrooks Davis 52f889d2efSBrooks Davis static void if_clone_free(struct if_clone *ifc); 53f889d2efSBrooks Davis 54f889d2efSBrooks Davis static struct mtx if_cloners_mtx; 55f889d2efSBrooks Davis static int if_cloners_count; 56f889d2efSBrooks Davis LIST_HEAD(, if_clone) if_cloners = LIST_HEAD_INITIALIZER(if_cloners); 57f889d2efSBrooks Davis 58f889d2efSBrooks Davis #define IF_CLONERS_LOCK_INIT() \ 59f889d2efSBrooks Davis mtx_init(&if_cloners_mtx, "if_cloners lock", NULL, MTX_DEF) 60f889d2efSBrooks Davis #define IF_CLONERS_LOCK_ASSERT() mtx_assert(&if_cloners_mtx, MA_OWNED) 61f889d2efSBrooks Davis #define IF_CLONERS_LOCK() mtx_lock(&if_cloners_mtx) 62f889d2efSBrooks Davis #define IF_CLONERS_UNLOCK() mtx_unlock(&if_cloners_mtx) 63f889d2efSBrooks Davis 64f889d2efSBrooks Davis #define IF_CLONE_LOCK_INIT(ifc) \ 65f889d2efSBrooks Davis mtx_init(&(ifc)->ifc_mtx, "if_clone lock", NULL, MTX_DEF) 66f889d2efSBrooks Davis #define IF_CLONE_LOCK_DESTROY(ifc) mtx_destroy(&(ifc)->ifc_mtx) 67f889d2efSBrooks Davis #define IF_CLONE_LOCK_ASSERT(ifc) mtx_assert(&(ifc)->ifc_mtx, MA_OWNED) 68f889d2efSBrooks Davis #define IF_CLONE_LOCK(ifc) mtx_lock(&(ifc)->ifc_mtx) 69f889d2efSBrooks Davis #define IF_CLONE_UNLOCK(ifc) mtx_unlock(&(ifc)->ifc_mtx) 70f889d2efSBrooks Davis 71f889d2efSBrooks Davis #define IF_CLONE_ADDREF(ifc) \ 72f889d2efSBrooks Davis do { \ 73f889d2efSBrooks Davis IF_CLONE_LOCK(ifc); \ 74f889d2efSBrooks Davis IF_CLONE_ADDREF_LOCKED(ifc); \ 75f889d2efSBrooks Davis IF_CLONE_UNLOCK(ifc); \ 76f889d2efSBrooks Davis } while (0) 77f889d2efSBrooks Davis #define IF_CLONE_ADDREF_LOCKED(ifc) \ 78f889d2efSBrooks Davis do { \ 79f889d2efSBrooks Davis IF_CLONE_LOCK_ASSERT(ifc); \ 80f889d2efSBrooks Davis KASSERT((ifc)->ifc_refcnt >= 0, \ 81f889d2efSBrooks Davis ("negative refcnt %ld", (ifc)->ifc_refcnt)); \ 82f889d2efSBrooks Davis (ifc)->ifc_refcnt++; \ 83f889d2efSBrooks Davis } while (0) 84f889d2efSBrooks Davis #define IF_CLONE_REMREF(ifc) \ 85f889d2efSBrooks Davis do { \ 86f889d2efSBrooks Davis IF_CLONE_LOCK(ifc); \ 87f889d2efSBrooks Davis IF_CLONE_REMREF_LOCKED(ifc); \ 88f889d2efSBrooks Davis } while (0) 89f889d2efSBrooks Davis #define IF_CLONE_REMREF_LOCKED(ifc) \ 90f889d2efSBrooks Davis do { \ 91f889d2efSBrooks Davis IF_CLONE_LOCK_ASSERT(ifc); \ 92f889d2efSBrooks Davis KASSERT((ifc)->ifc_refcnt > 0, \ 93f889d2efSBrooks Davis ("bogus refcnt %ld", (ifc)->ifc_refcnt)); \ 94f889d2efSBrooks Davis if (--(ifc)->ifc_refcnt == 0) { \ 95f889d2efSBrooks Davis IF_CLONE_UNLOCK(ifc); \ 96f889d2efSBrooks Davis if_clone_free(ifc); \ 97ca64c799SMax Laier } else { \ 98f889d2efSBrooks Davis /* silently free the lock */ \ 99f889d2efSBrooks Davis IF_CLONE_UNLOCK(ifc); \ 100ca64c799SMax Laier } \ 101f889d2efSBrooks Davis } while (0) 102f889d2efSBrooks Davis 103c711aea6SPoul-Henning Kamp static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework"); 104f889d2efSBrooks Davis 105f889d2efSBrooks Davis void 106f889d2efSBrooks Davis if_clone_init(void) 107f889d2efSBrooks Davis { 108f889d2efSBrooks Davis IF_CLONERS_LOCK_INIT(); 109f889d2efSBrooks Davis } 110f889d2efSBrooks Davis 111f889d2efSBrooks Davis /* 112f889d2efSBrooks Davis * Create a clone network interface. 113f889d2efSBrooks Davis */ 114f889d2efSBrooks Davis int 115f889d2efSBrooks Davis if_clone_create(char *name, size_t len) 116f889d2efSBrooks Davis { 117f889d2efSBrooks Davis int err; 118f889d2efSBrooks Davis struct if_clone *ifc; 119f889d2efSBrooks Davis 120f889d2efSBrooks Davis if (ifunit(name) != NULL) 121f889d2efSBrooks Davis return (EEXIST); 122f889d2efSBrooks Davis 123f889d2efSBrooks Davis /* Try to find an applicable cloner for this request */ 124f889d2efSBrooks Davis IF_CLONERS_LOCK(); 125f889d2efSBrooks Davis LIST_FOREACH(ifc, &if_cloners, ifc_list) { 126f889d2efSBrooks Davis if (ifc->ifc_match(ifc, name)) { 127f889d2efSBrooks Davis IF_CLONE_ADDREF(ifc); 128f889d2efSBrooks Davis break; 129f889d2efSBrooks Davis } 130f889d2efSBrooks Davis } 131f889d2efSBrooks Davis IF_CLONERS_UNLOCK(); 132f889d2efSBrooks Davis 133f889d2efSBrooks Davis if (ifc == NULL) 134f889d2efSBrooks Davis return (EINVAL); 135f889d2efSBrooks Davis 136f889d2efSBrooks Davis err = (*ifc->ifc_create)(ifc, name, len); 137f889d2efSBrooks Davis IF_CLONE_REMREF(ifc); 138f889d2efSBrooks Davis return (err); 139f889d2efSBrooks Davis } 140f889d2efSBrooks Davis 141f889d2efSBrooks Davis /* 142f889d2efSBrooks Davis * Destroy a clone network interface. 143f889d2efSBrooks Davis */ 144f889d2efSBrooks Davis int 145f889d2efSBrooks Davis if_clone_destroy(const char *name) 146f889d2efSBrooks Davis { 147f889d2efSBrooks Davis int err; 148f889d2efSBrooks Davis struct if_clone *ifc; 149f889d2efSBrooks Davis struct ifnet *ifp; 150f889d2efSBrooks Davis 151f889d2efSBrooks Davis ifp = ifunit(name); 152f889d2efSBrooks Davis if (ifp == NULL) 153f889d2efSBrooks Davis return (ENXIO); 154f889d2efSBrooks Davis 155f889d2efSBrooks Davis /* Find the cloner for this interface */ 156f889d2efSBrooks Davis IF_CLONERS_LOCK(); 157f889d2efSBrooks Davis LIST_FOREACH(ifc, &if_cloners, ifc_list) { 158f889d2efSBrooks Davis if (strcmp(ifc->ifc_name, ifp->if_dname) == 0) { 159f889d2efSBrooks Davis IF_CLONE_ADDREF(ifc); 160f889d2efSBrooks Davis break; 161f889d2efSBrooks Davis } 162f889d2efSBrooks Davis } 163f889d2efSBrooks Davis IF_CLONERS_UNLOCK(); 164f889d2efSBrooks Davis if (ifc == NULL) 165f889d2efSBrooks Davis return (EINVAL); 166f889d2efSBrooks Davis 167f889d2efSBrooks Davis if (ifc->ifc_destroy == NULL) { 168f889d2efSBrooks Davis err = EOPNOTSUPP; 169f889d2efSBrooks Davis goto done; 170f889d2efSBrooks Davis } 171f889d2efSBrooks Davis 172f889d2efSBrooks Davis err = (*ifc->ifc_destroy)(ifc, ifp); 173f889d2efSBrooks Davis 174f889d2efSBrooks Davis done: 175f889d2efSBrooks Davis IF_CLONE_REMREF(ifc); 176f889d2efSBrooks Davis return (err); 177f889d2efSBrooks Davis } 178f889d2efSBrooks Davis 179f889d2efSBrooks Davis /* 180f889d2efSBrooks Davis * Register a network interface cloner. 181f889d2efSBrooks Davis */ 182f889d2efSBrooks Davis void 183f889d2efSBrooks Davis if_clone_attach(struct if_clone *ifc) 184f889d2efSBrooks Davis { 185f889d2efSBrooks Davis int len, maxclone; 186f889d2efSBrooks Davis 187f889d2efSBrooks Davis /* 188f889d2efSBrooks Davis * Compute bitmap size and allocate it. 189f889d2efSBrooks Davis */ 190f889d2efSBrooks Davis maxclone = ifc->ifc_maxunit + 1; 191f889d2efSBrooks Davis len = maxclone >> 3; 192f889d2efSBrooks Davis if ((len << 3) < maxclone) 193f889d2efSBrooks Davis len++; 194f889d2efSBrooks Davis ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO); 195f889d2efSBrooks Davis ifc->ifc_bmlen = len; 196f889d2efSBrooks Davis IF_CLONE_LOCK_INIT(ifc); 197f889d2efSBrooks Davis IF_CLONE_ADDREF(ifc); 198f889d2efSBrooks Davis 199f889d2efSBrooks Davis IF_CLONERS_LOCK(); 200f889d2efSBrooks Davis LIST_INSERT_HEAD(&if_cloners, ifc, ifc_list); 201f889d2efSBrooks Davis if_cloners_count++; 202f889d2efSBrooks Davis IF_CLONERS_UNLOCK(); 203f889d2efSBrooks Davis 204f889d2efSBrooks Davis if (ifc->ifc_attach != NULL) 205f889d2efSBrooks Davis (*ifc->ifc_attach)(ifc); 206f889d2efSBrooks Davis EVENTHANDLER_INVOKE(if_clone_event, ifc); 207f889d2efSBrooks Davis } 208f889d2efSBrooks Davis 209f889d2efSBrooks Davis /* 210f889d2efSBrooks Davis * Unregister a network interface cloner. 211f889d2efSBrooks Davis */ 212f889d2efSBrooks Davis void 213f889d2efSBrooks Davis if_clone_detach(struct if_clone *ifc) 214f889d2efSBrooks Davis { 215f889d2efSBrooks Davis 216f889d2efSBrooks Davis IF_CLONERS_LOCK(); 217f889d2efSBrooks Davis LIST_REMOVE(ifc, ifc_list); 218f889d2efSBrooks Davis if_cloners_count--; 219f889d2efSBrooks Davis IF_CLONERS_UNLOCK(); 220f889d2efSBrooks Davis 221f889d2efSBrooks Davis IF_CLONE_REMREF(ifc); 222f889d2efSBrooks Davis } 223f889d2efSBrooks Davis 224f889d2efSBrooks Davis static void 225f889d2efSBrooks Davis if_clone_free(struct if_clone *ifc) 226f889d2efSBrooks Davis { 227f889d2efSBrooks Davis 228f889d2efSBrooks Davis IF_CLONE_LOCK_DESTROY(ifc); 229f889d2efSBrooks Davis free(ifc->ifc_units, M_CLONE); 230f889d2efSBrooks Davis } 231f889d2efSBrooks Davis 232f889d2efSBrooks Davis /* 233f889d2efSBrooks Davis * Provide list of interface cloners to userspace. 234f889d2efSBrooks Davis */ 235f889d2efSBrooks Davis int 236f889d2efSBrooks Davis if_clone_list(struct if_clonereq *ifcr) 237f889d2efSBrooks Davis { 238c859ef97SBrooks Davis char *buf, *dst, *outbuf = NULL; 239f889d2efSBrooks Davis struct if_clone *ifc; 240c859ef97SBrooks Davis int buf_count, count, err = 0; 241c859ef97SBrooks Davis 242a6d00835SMaxim Konovalov if (ifcr->ifcr_count < 0) 243a6d00835SMaxim Konovalov return (EINVAL); 244a6d00835SMaxim Konovalov 245c859ef97SBrooks Davis IF_CLONERS_LOCK(); 246c859ef97SBrooks Davis /* 247c859ef97SBrooks Davis * Set our internal output buffer size. We could end up not 248c859ef97SBrooks Davis * reporting a cloner that is added between the unlock and lock 249c859ef97SBrooks Davis * below, but that's not a major problem. Not caping our 250c859ef97SBrooks Davis * allocation to the number of cloners actually in the system 251c859ef97SBrooks Davis * could be because that would let arbitrary users cause us to 252c859ef97SBrooks Davis * allocate abritrary amounts of kernel memory. 253c859ef97SBrooks Davis */ 254c859ef97SBrooks Davis buf_count = (if_cloners_count < ifcr->ifcr_count) ? 255c859ef97SBrooks Davis if_cloners_count : ifcr->ifcr_count; 256c859ef97SBrooks Davis IF_CLONERS_UNLOCK(); 257c859ef97SBrooks Davis 258c859ef97SBrooks Davis outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO); 259f889d2efSBrooks Davis 260f889d2efSBrooks Davis IF_CLONERS_LOCK(); 261f889d2efSBrooks Davis 262f889d2efSBrooks Davis ifcr->ifcr_total = if_cloners_count; 263f889d2efSBrooks Davis if ((dst = ifcr->ifcr_buffer) == NULL) { 264f889d2efSBrooks Davis /* Just asking how many there are. */ 265f889d2efSBrooks Davis goto done; 266f889d2efSBrooks Davis } 267c859ef97SBrooks Davis count = (if_cloners_count < buf_count) ? 268c859ef97SBrooks Davis if_cloners_count : buf_count; 269f889d2efSBrooks Davis 270c859ef97SBrooks Davis for (ifc = LIST_FIRST(&if_cloners), buf = outbuf; 271c859ef97SBrooks Davis ifc != NULL && count != 0; 272c859ef97SBrooks Davis ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) { 273c859ef97SBrooks Davis strlcpy(buf, ifc->ifc_name, IFNAMSIZ); 274f889d2efSBrooks Davis } 275f889d2efSBrooks Davis 276f889d2efSBrooks Davis done: 277f889d2efSBrooks Davis IF_CLONERS_UNLOCK(); 278c859ef97SBrooks Davis if (err == 0) 279c859ef97SBrooks Davis err = copyout(outbuf, dst, buf_count*IFNAMSIZ); 280c859ef97SBrooks Davis if (outbuf != NULL) 281c859ef97SBrooks Davis free(outbuf, M_CLONE); 282f889d2efSBrooks Davis return (err); 283f889d2efSBrooks Davis } 284f889d2efSBrooks Davis 285f889d2efSBrooks Davis /* 286f889d2efSBrooks Davis * A utility function to extract unit numbers from interface names of 287f889d2efSBrooks Davis * the form name###. 288f889d2efSBrooks Davis * 289f889d2efSBrooks Davis * Returns 0 on success and an error on failure. 290f889d2efSBrooks Davis */ 291f889d2efSBrooks Davis int 292f889d2efSBrooks Davis ifc_name2unit(const char *name, int *unit) 293f889d2efSBrooks Davis { 294f889d2efSBrooks Davis const char *cp; 295f889d2efSBrooks Davis 296f889d2efSBrooks Davis for (cp = name; *cp != '\0' && (*cp < '0' || *cp > '9'); cp++); 297f889d2efSBrooks Davis if (*cp == '\0') { 298f889d2efSBrooks Davis *unit = -1; 299f889d2efSBrooks Davis } else { 300f889d2efSBrooks Davis for (*unit = 0; *cp != '\0'; cp++) { 301f889d2efSBrooks Davis if (*cp < '0' || *cp > '9') { 302f889d2efSBrooks Davis /* Bogus unit number. */ 303f889d2efSBrooks Davis return (EINVAL); 304f889d2efSBrooks Davis } 305f889d2efSBrooks Davis *unit = (*unit * 10) + (*cp - '0'); 306f889d2efSBrooks Davis } 307f889d2efSBrooks Davis } 308f889d2efSBrooks Davis 309f889d2efSBrooks Davis return (0); 310f889d2efSBrooks Davis } 311f889d2efSBrooks Davis 312f889d2efSBrooks Davis int 313f889d2efSBrooks Davis ifc_alloc_unit(struct if_clone *ifc, int *unit) 314f889d2efSBrooks Davis { 315f889d2efSBrooks Davis int wildcard, bytoff, bitoff; 316f889d2efSBrooks Davis int err = 0; 317f889d2efSBrooks Davis 318f889d2efSBrooks Davis IF_CLONE_LOCK(ifc); 319f889d2efSBrooks Davis 320f889d2efSBrooks Davis bytoff = bitoff = 0; 321f889d2efSBrooks Davis wildcard = (*unit < 0); 322f889d2efSBrooks Davis /* 323f889d2efSBrooks Davis * Find a free unit if none was given. 324f889d2efSBrooks Davis */ 325f889d2efSBrooks Davis if (wildcard) { 326f889d2efSBrooks Davis while ((bytoff < ifc->ifc_bmlen) 327f889d2efSBrooks Davis && (ifc->ifc_units[bytoff] == 0xff)) 328f889d2efSBrooks Davis bytoff++; 329f889d2efSBrooks Davis if (bytoff >= ifc->ifc_bmlen) { 330f889d2efSBrooks Davis err = ENOSPC; 331f889d2efSBrooks Davis goto done; 332f889d2efSBrooks Davis } 333f889d2efSBrooks Davis while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) 334f889d2efSBrooks Davis bitoff++; 335f889d2efSBrooks Davis *unit = (bytoff << 3) + bitoff; 336f889d2efSBrooks Davis } 337f889d2efSBrooks Davis 338f889d2efSBrooks Davis if (*unit > ifc->ifc_maxunit) { 339f889d2efSBrooks Davis err = ENOSPC; 340f889d2efSBrooks Davis goto done; 341f889d2efSBrooks Davis } 342f889d2efSBrooks Davis 343f889d2efSBrooks Davis if (!wildcard) { 344f889d2efSBrooks Davis bytoff = *unit >> 3; 345f889d2efSBrooks Davis bitoff = *unit - (bytoff << 3); 346f889d2efSBrooks Davis } 347f889d2efSBrooks Davis 348f889d2efSBrooks Davis if((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) { 349f889d2efSBrooks Davis err = EEXIST; 350f889d2efSBrooks Davis goto done; 351f889d2efSBrooks Davis } 352f889d2efSBrooks Davis /* 353f889d2efSBrooks Davis * Allocate the unit in the bitmap. 354f889d2efSBrooks Davis */ 355f889d2efSBrooks Davis ifc->ifc_units[bytoff] |= (1 << bitoff); 356f889d2efSBrooks Davis 357f889d2efSBrooks Davis done: 358f889d2efSBrooks Davis IF_CLONE_UNLOCK(ifc); 359f889d2efSBrooks Davis return (err); 360f889d2efSBrooks Davis } 361f889d2efSBrooks Davis 362f889d2efSBrooks Davis void 363f889d2efSBrooks Davis ifc_free_unit(struct if_clone *ifc, int unit) 364f889d2efSBrooks Davis { 365f889d2efSBrooks Davis int bytoff, bitoff; 366f889d2efSBrooks Davis 367f889d2efSBrooks Davis 368f889d2efSBrooks Davis /* 369f889d2efSBrooks Davis * Compute offset in the bitmap and deallocate the unit. 370f889d2efSBrooks Davis */ 371f889d2efSBrooks Davis bytoff = unit >> 3; 372f889d2efSBrooks Davis bitoff = unit - (bytoff << 3); 373f889d2efSBrooks Davis 374f889d2efSBrooks Davis IF_CLONE_LOCK(ifc); 375f889d2efSBrooks Davis KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0, 376f889d2efSBrooks Davis ("%s: bit is already cleared", __func__)); 377f889d2efSBrooks Davis ifc->ifc_units[bytoff] &= ~(1 << bitoff); 378f889d2efSBrooks Davis IF_CLONE_UNLOCK(ifc); 379f889d2efSBrooks Davis } 380f889d2efSBrooks Davis 381f889d2efSBrooks Davis void 382f889d2efSBrooks Davis ifc_simple_attach(struct if_clone *ifc) 383f889d2efSBrooks Davis { 384f889d2efSBrooks Davis int err; 385f889d2efSBrooks Davis int unit; 386f889d2efSBrooks Davis char name[IFNAMSIZ]; 387f889d2efSBrooks Davis struct ifc_simple_data *ifcs = ifc->ifc_data; 388f889d2efSBrooks Davis 389f889d2efSBrooks Davis KASSERT(ifcs->ifcs_minifs - 1 <= ifc->ifc_maxunit, 390f889d2efSBrooks Davis ("%s: %s requested more units then allowed (%d > %d)", 391f889d2efSBrooks Davis __func__, ifc->ifc_name, ifcs->ifcs_minifs, 392f889d2efSBrooks Davis ifc->ifc_maxunit + 1)); 393f889d2efSBrooks Davis 394f889d2efSBrooks Davis for (unit = 0; unit < ifcs->ifcs_minifs; unit++) { 395f889d2efSBrooks Davis snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit); 396f889d2efSBrooks Davis err = (*ifc->ifc_create)(ifc, name, IFNAMSIZ); 397f889d2efSBrooks Davis KASSERT(err == 0, 398f889d2efSBrooks Davis ("%s: failed to create required interface %s", 399f889d2efSBrooks Davis __func__, name)); 400f889d2efSBrooks Davis } 401f889d2efSBrooks Davis } 402f889d2efSBrooks Davis 403f889d2efSBrooks Davis int 404f889d2efSBrooks Davis ifc_simple_match(struct if_clone *ifc, const char *name) 405f889d2efSBrooks Davis { 406f889d2efSBrooks Davis const char *cp; 407f889d2efSBrooks Davis int i; 408f889d2efSBrooks Davis 409f889d2efSBrooks Davis /* Match the name */ 410f889d2efSBrooks Davis for (cp = name, i = 0; i < strlen(ifc->ifc_name); i++, cp++) { 411f889d2efSBrooks Davis if (ifc->ifc_name[i] != *cp) 412f889d2efSBrooks Davis return (0); 413f889d2efSBrooks Davis } 414f889d2efSBrooks Davis 415f889d2efSBrooks Davis /* Make sure there's a unit number or nothing after the name */ 416f889d2efSBrooks Davis for (; *cp != '\0'; cp++) { 417f889d2efSBrooks Davis if (*cp < '0' || *cp > '9') 418f889d2efSBrooks Davis return (0); 419f889d2efSBrooks Davis } 420f889d2efSBrooks Davis 421f889d2efSBrooks Davis return (1); 422f889d2efSBrooks Davis } 423f889d2efSBrooks Davis 424f889d2efSBrooks Davis int 425f889d2efSBrooks Davis ifc_simple_create(struct if_clone *ifc, char *name, size_t len) 426f889d2efSBrooks Davis { 427f889d2efSBrooks Davis char *dp; 428f889d2efSBrooks Davis int wildcard; 429f889d2efSBrooks Davis int unit; 430f889d2efSBrooks Davis int err; 431f889d2efSBrooks Davis struct ifc_simple_data *ifcs = ifc->ifc_data; 432f889d2efSBrooks Davis 433f889d2efSBrooks Davis err = ifc_name2unit(name, &unit); 434f889d2efSBrooks Davis if (err != 0) 435f889d2efSBrooks Davis return (err); 436f889d2efSBrooks Davis 437f889d2efSBrooks Davis wildcard = (unit < 0); 438f889d2efSBrooks Davis 439f889d2efSBrooks Davis err = ifc_alloc_unit(ifc, &unit); 440f889d2efSBrooks Davis if (err != 0) 441f889d2efSBrooks Davis return (err); 442f889d2efSBrooks Davis 443f889d2efSBrooks Davis err = ifcs->ifcs_create(ifc, unit); 444f889d2efSBrooks Davis if (err != 0) { 445f889d2efSBrooks Davis ifc_free_unit(ifc, unit); 446f889d2efSBrooks Davis return (err); 447f889d2efSBrooks Davis } 448f889d2efSBrooks Davis 449f889d2efSBrooks Davis /* In the wildcard case, we need to update the name. */ 450f889d2efSBrooks Davis if (wildcard) { 451f889d2efSBrooks Davis for (dp = name; *dp != '\0'; dp++); 452f889d2efSBrooks Davis if (snprintf(dp, len - (dp-name), "%d", unit) > 453f889d2efSBrooks Davis len - (dp-name) - 1) { 454f889d2efSBrooks Davis /* 455f889d2efSBrooks Davis * This can only be a programmer error and 456f889d2efSBrooks Davis * there's no straightforward way to recover if 457f889d2efSBrooks Davis * it happens. 458f889d2efSBrooks Davis */ 459f889d2efSBrooks Davis panic("if_clone_create(): interface name too long"); 460f889d2efSBrooks Davis } 461f889d2efSBrooks Davis 462f889d2efSBrooks Davis } 463f889d2efSBrooks Davis 464f889d2efSBrooks Davis return (0); 465f889d2efSBrooks Davis } 466f889d2efSBrooks Davis 467f889d2efSBrooks Davis int 468f889d2efSBrooks Davis ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp) 469f889d2efSBrooks Davis { 470f889d2efSBrooks Davis int unit; 471f889d2efSBrooks Davis struct ifc_simple_data *ifcs = ifc->ifc_data; 472f889d2efSBrooks Davis 473f889d2efSBrooks Davis unit = ifp->if_dunit; 474f889d2efSBrooks Davis 475f889d2efSBrooks Davis if (unit < ifcs->ifcs_minifs) 476f889d2efSBrooks Davis return (EINVAL); 477f889d2efSBrooks Davis 478f889d2efSBrooks Davis ifcs->ifcs_destroy(ifp); 479f889d2efSBrooks Davis 480f889d2efSBrooks Davis ifc_free_unit(ifc, unit); 481f889d2efSBrooks Davis 482f889d2efSBrooks Davis return (0); 483f889d2efSBrooks Davis } 484