The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/net/if_clone.c

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    1 /*-
    2  * Copyright (c) 1980, 1986, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    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.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   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
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)if.c        8.5 (Berkeley) 1/9/95
   30  * $FreeBSD: releng/8.0/sys/net/if_clone.c 196019 2009-08-01 19:26:27Z rwatson $
   31  */
   32 
   33 #include <sys/param.h>
   34 #include <sys/malloc.h>
   35 #include <sys/limits.h>
   36 #include <sys/lock.h>
   37 #include <sys/mutex.h>
   38 #include <sys/kernel.h>
   39 #include <sys/systm.h>
   40 #include <sys/types.h>
   41 #include <sys/socket.h>
   42 
   43 #include <net/if.h>
   44 #include <net/if_clone.h>
   45 #if 0
   46 #include <net/if_dl.h>
   47 #endif
   48 #include <net/if_types.h>
   49 #include <net/if_var.h>
   50 #include <net/radix.h>
   51 #include <net/route.h>
   52 #include <net/vnet.h>
   53 
   54 static void     if_clone_free(struct if_clone *ifc);
   55 static int      if_clone_createif(struct if_clone *ifc, char *name, size_t len,
   56                     caddr_t params);
   57 
   58 static struct mtx       if_cloners_mtx;
   59 static VNET_DEFINE(int, if_cloners_count);
   60 VNET_DEFINE(LIST_HEAD(, if_clone), if_cloners);
   61 
   62 #define V_if_cloners_count      VNET(if_cloners_count)
   63 #define V_if_cloners            VNET(if_cloners)
   64 
   65 #define IF_CLONERS_LOCK_INIT()          \
   66     mtx_init(&if_cloners_mtx, "if_cloners lock", NULL, MTX_DEF)
   67 #define IF_CLONERS_LOCK_ASSERT()        mtx_assert(&if_cloners_mtx, MA_OWNED)
   68 #define IF_CLONERS_LOCK()               mtx_lock(&if_cloners_mtx)
   69 #define IF_CLONERS_UNLOCK()             mtx_unlock(&if_cloners_mtx)
   70 
   71 #define IF_CLONE_LOCK_INIT(ifc)         \
   72     mtx_init(&(ifc)->ifc_mtx, "if_clone lock", NULL, MTX_DEF)
   73 #define IF_CLONE_LOCK_DESTROY(ifc)      mtx_destroy(&(ifc)->ifc_mtx)
   74 #define IF_CLONE_LOCK_ASSERT(ifc)       mtx_assert(&(ifc)->ifc_mtx, MA_OWNED)
   75 #define IF_CLONE_LOCK(ifc)              mtx_lock(&(ifc)->ifc_mtx)
   76 #define IF_CLONE_UNLOCK(ifc)            mtx_unlock(&(ifc)->ifc_mtx)
   77 
   78 #define IF_CLONE_ADDREF(ifc)                                            \
   79         do {                                                            \
   80                 IF_CLONE_LOCK(ifc);                                     \
   81                 IF_CLONE_ADDREF_LOCKED(ifc);                            \
   82                 IF_CLONE_UNLOCK(ifc);                                   \
   83         } while (0)
   84 #define IF_CLONE_ADDREF_LOCKED(ifc)                                     \
   85         do {                                                            \
   86                 IF_CLONE_LOCK_ASSERT(ifc);                              \
   87                 KASSERT((ifc)->ifc_refcnt >= 0,                         \
   88                     ("negative refcnt %ld", (ifc)->ifc_refcnt));        \
   89                 (ifc)->ifc_refcnt++;                                    \
   90         } while (0)
   91 #define IF_CLONE_REMREF(ifc)                                            \
   92         do {                                                            \
   93                 IF_CLONE_LOCK(ifc);                                     \
   94                 IF_CLONE_REMREF_LOCKED(ifc);                            \
   95         } while (0)
   96 #define IF_CLONE_REMREF_LOCKED(ifc)                                     \
   97         do {                                                            \
   98                 IF_CLONE_LOCK_ASSERT(ifc);                              \
   99                 KASSERT((ifc)->ifc_refcnt > 0,                          \
  100                     ("bogus refcnt %ld", (ifc)->ifc_refcnt));           \
  101                 if (--(ifc)->ifc_refcnt == 0) {                         \
  102                         IF_CLONE_UNLOCK(ifc);                           \
  103                         if_clone_free(ifc);                             \
  104                 } else {                                                \
  105                         /* silently free the lock */                    \
  106                         IF_CLONE_UNLOCK(ifc);                           \
  107                 }                                                       \
  108         } while (0)
  109 
  110 #define IFC_IFLIST_INSERT(_ifc, _ifp)                                   \
  111         LIST_INSERT_HEAD(&_ifc->ifc_iflist, _ifp, if_clones)
  112 #define IFC_IFLIST_REMOVE(_ifc, _ifp)                                   \
  113         LIST_REMOVE(_ifp, if_clones)
  114 
  115 static MALLOC_DEFINE(M_CLONE, "clone", "interface cloning framework");
  116 
  117 void
  118 vnet_if_clone_init(void)
  119 {
  120 
  121         LIST_INIT(&V_if_cloners);
  122 }
  123 
  124 void
  125 if_clone_init(void)
  126 {
  127 
  128         IF_CLONERS_LOCK_INIT();
  129 }
  130 
  131 /*
  132  * Lookup and create a clone network interface.
  133  */
  134 int
  135 if_clone_create(char *name, size_t len, caddr_t params)
  136 {
  137         struct if_clone *ifc;
  138 
  139         /* Try to find an applicable cloner for this request */
  140         IF_CLONERS_LOCK();
  141         LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
  142                 if (ifc->ifc_match(ifc, name)) {
  143                         break;
  144                 }
  145         }
  146 #ifdef VIMAGE
  147         if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
  148                 CURVNET_SET_QUIET(vnet0);
  149                 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
  150                         if (ifc->ifc_match(ifc, name))
  151                                 break;
  152                 }
  153                 CURVNET_RESTORE();
  154         }
  155 #endif
  156         IF_CLONERS_UNLOCK();
  157 
  158         if (ifc == NULL)
  159                 return (EINVAL);
  160 
  161         return (if_clone_createif(ifc, name, len, params));
  162 }
  163 
  164 /*
  165  * Create a clone network interface.
  166  */
  167 static int
  168 if_clone_createif(struct if_clone *ifc, char *name, size_t len, caddr_t params)
  169 {
  170         int err;
  171         struct ifnet *ifp;
  172 
  173         if (ifunit(name) != NULL)
  174                 return (EEXIST);
  175 
  176         err = (*ifc->ifc_create)(ifc, name, len, params);
  177         
  178         if (!err) {
  179                 ifp = ifunit(name);
  180                 if (ifp == NULL)
  181                         panic("%s: lookup failed for %s", __func__, name);
  182 
  183                 if_addgroup(ifp, ifc->ifc_name);
  184 
  185                 IF_CLONE_LOCK(ifc);
  186                 IFC_IFLIST_INSERT(ifc, ifp);
  187                 IF_CLONE_UNLOCK(ifc);
  188         }
  189 
  190         return (err);
  191 }
  192 
  193 /*
  194  * Lookup and destroy a clone network interface.
  195  */
  196 int
  197 if_clone_destroy(const char *name)
  198 {
  199         struct if_clone *ifc;
  200         struct ifnet *ifp;
  201 
  202         ifp = ifunit(name);
  203         if (ifp == NULL)
  204                 return (ENXIO);
  205 
  206         /* Find the cloner for this interface */
  207         IF_CLONERS_LOCK();
  208         LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
  209                 if (strcmp(ifc->ifc_name, ifp->if_dname) == 0) {
  210                         break;
  211                 }
  212         }
  213 #ifdef VIMAGE
  214         if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
  215                 CURVNET_SET_QUIET(vnet0);
  216                 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
  217                         if (ifc->ifc_match(ifc, name))
  218                                 break;
  219                 }
  220                 CURVNET_RESTORE();
  221         }
  222 #endif
  223         IF_CLONERS_UNLOCK();
  224         if (ifc == NULL)
  225                 return (EINVAL);
  226 
  227         return (if_clone_destroyif(ifc, ifp));
  228 }
  229 
  230 /*
  231  * Destroy a clone network interface.
  232  */
  233 int
  234 if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp)
  235 {
  236         int err;
  237 
  238         if (ifc->ifc_destroy == NULL)
  239                 return(EOPNOTSUPP);
  240 
  241         /*
  242          * Given that the cloned ifnet might be attached to a different
  243          * vnet from where its cloner was registered, we have to
  244          * switch to the vnet context of the target vnet.
  245          */
  246         CURVNET_SET_QUIET(ifp->if_vnet);
  247 
  248         IF_CLONE_LOCK(ifc);
  249         IFC_IFLIST_REMOVE(ifc, ifp);
  250         IF_CLONE_UNLOCK(ifc);
  251 
  252         if_delgroup(ifp, ifc->ifc_name);
  253 
  254         err =  (*ifc->ifc_destroy)(ifc, ifp);
  255 
  256         if (err != 0) {
  257                 if_addgroup(ifp, ifc->ifc_name);
  258 
  259                 IF_CLONE_LOCK(ifc);
  260                 IFC_IFLIST_INSERT(ifc, ifp);
  261                 IF_CLONE_UNLOCK(ifc);
  262         }
  263         CURVNET_RESTORE();
  264         return (err);
  265 }
  266 
  267 /*
  268  * Register a network interface cloner.
  269  */
  270 void
  271 if_clone_attach(struct if_clone *ifc)
  272 {
  273         int len, maxclone;
  274 
  275         /*
  276          * Compute bitmap size and allocate it.
  277          */
  278         maxclone = ifc->ifc_maxunit + 1;
  279         len = maxclone >> 3;
  280         if ((len << 3) < maxclone)
  281                 len++;
  282         ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
  283         ifc->ifc_bmlen = len;
  284         IF_CLONE_LOCK_INIT(ifc);
  285         IF_CLONE_ADDREF(ifc);
  286 
  287         IF_CLONERS_LOCK();
  288         LIST_INSERT_HEAD(&V_if_cloners, ifc, ifc_list);
  289         V_if_cloners_count++;
  290         IF_CLONERS_UNLOCK();
  291 
  292         LIST_INIT(&ifc->ifc_iflist);
  293 
  294         if (ifc->ifc_attach != NULL)
  295                 (*ifc->ifc_attach)(ifc);
  296         EVENTHANDLER_INVOKE(if_clone_event, ifc);
  297 }
  298 
  299 /*
  300  * Unregister a network interface cloner.
  301  */
  302 void
  303 if_clone_detach(struct if_clone *ifc)
  304 {
  305         struct ifc_simple_data *ifcs = ifc->ifc_data;
  306 
  307         IF_CLONERS_LOCK();
  308         LIST_REMOVE(ifc, ifc_list);
  309         V_if_cloners_count--;
  310         IF_CLONERS_UNLOCK();
  311 
  312         /* Allow all simples to be destroyed */
  313         if (ifc->ifc_attach == ifc_simple_attach)
  314                 ifcs->ifcs_minifs = 0;
  315 
  316         /* destroy all interfaces for this cloner */
  317         while (!LIST_EMPTY(&ifc->ifc_iflist))
  318                 if_clone_destroyif(ifc, LIST_FIRST(&ifc->ifc_iflist));
  319         
  320         IF_CLONE_REMREF(ifc);
  321 }
  322 
  323 static void
  324 if_clone_free(struct if_clone *ifc)
  325 {
  326         for (int bytoff = 0; bytoff < ifc->ifc_bmlen; bytoff++) {
  327                 KASSERT(ifc->ifc_units[bytoff] == 0x00,
  328                     ("ifc_units[%d] is not empty", bytoff));
  329         }
  330 
  331         KASSERT(LIST_EMPTY(&ifc->ifc_iflist),
  332             ("%s: ifc_iflist not empty", __func__));
  333 
  334         IF_CLONE_LOCK_DESTROY(ifc);
  335         free(ifc->ifc_units, M_CLONE);
  336 }
  337 
  338 /*
  339  * Provide list of interface cloners to userspace.
  340  */
  341 int
  342 if_clone_list(struct if_clonereq *ifcr)
  343 {
  344         char *buf, *dst, *outbuf = NULL;
  345         struct if_clone *ifc;
  346         int buf_count, count, err = 0;
  347 
  348         if (ifcr->ifcr_count < 0)
  349                 return (EINVAL);
  350 
  351         IF_CLONERS_LOCK();
  352         /*
  353          * Set our internal output buffer size.  We could end up not
  354          * reporting a cloner that is added between the unlock and lock
  355          * below, but that's not a major problem.  Not caping our
  356          * allocation to the number of cloners actually in the system
  357          * could be because that would let arbitrary users cause us to
  358          * allocate abritrary amounts of kernel memory.
  359          */
  360         buf_count = (V_if_cloners_count < ifcr->ifcr_count) ?
  361             V_if_cloners_count : ifcr->ifcr_count;
  362         IF_CLONERS_UNLOCK();
  363 
  364         outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO);
  365 
  366         IF_CLONERS_LOCK();
  367 
  368         ifcr->ifcr_total = V_if_cloners_count;
  369         if ((dst = ifcr->ifcr_buffer) == NULL) {
  370                 /* Just asking how many there are. */
  371                 goto done;
  372         }
  373         count = (V_if_cloners_count < buf_count) ?
  374             V_if_cloners_count : buf_count;
  375 
  376         for (ifc = LIST_FIRST(&V_if_cloners), buf = outbuf;
  377             ifc != NULL && count != 0;
  378             ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) {
  379                 strlcpy(buf, ifc->ifc_name, IFNAMSIZ);
  380         }
  381 
  382 done:
  383         IF_CLONERS_UNLOCK();
  384         if (err == 0)
  385                 err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
  386         if (outbuf != NULL)
  387                 free(outbuf, M_CLONE);
  388         return (err);
  389 }
  390 
  391 /*
  392  * A utility function to extract unit numbers from interface names of
  393  * the form name###.
  394  *
  395  * Returns 0 on success and an error on failure.
  396  */
  397 int
  398 ifc_name2unit(const char *name, int *unit)
  399 {
  400         const char      *cp;
  401         int             cutoff = INT_MAX / 10;
  402         int             cutlim = INT_MAX % 10;
  403 
  404         for (cp = name; *cp != '\0' && (*cp < '' || *cp > '9'); cp++);
  405         if (*cp == '\0') {
  406                 *unit = -1;
  407         } else if (cp[0] == '' && cp[1] != '\0') {
  408                 /* Disallow leading zeroes. */
  409                 return (EINVAL);
  410         } else {
  411                 for (*unit = 0; *cp != '\0'; cp++) {
  412                         if (*cp < '' || *cp > '9') {
  413                                 /* Bogus unit number. */
  414                                 return (EINVAL);
  415                         }
  416                         if (*unit > cutoff ||
  417                             (*unit == cutoff && *cp - '' > cutlim))
  418                                 return (EINVAL);
  419                         *unit = (*unit * 10) + (*cp - '');
  420                 }
  421         }
  422 
  423         return (0);
  424 }
  425 
  426 int
  427 ifc_alloc_unit(struct if_clone *ifc, int *unit)
  428 {
  429         int wildcard, bytoff, bitoff;
  430         int err = 0;
  431 
  432         IF_CLONE_LOCK(ifc);
  433 
  434         bytoff = bitoff = 0;
  435         wildcard = (*unit < 0);
  436         /*
  437          * Find a free unit if none was given.
  438          */
  439         if (wildcard) {
  440                 while ((bytoff < ifc->ifc_bmlen)
  441                     && (ifc->ifc_units[bytoff] == 0xff))
  442                         bytoff++;
  443                 if (bytoff >= ifc->ifc_bmlen) {
  444                         err = ENOSPC;
  445                         goto done;
  446                 }
  447                 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
  448                         bitoff++;
  449                 *unit = (bytoff << 3) + bitoff;
  450         }
  451 
  452         if (*unit > ifc->ifc_maxunit) {
  453                 err = ENOSPC;
  454                 goto done;
  455         }
  456 
  457         if (!wildcard) {
  458                 bytoff = *unit >> 3;
  459                 bitoff = *unit - (bytoff << 3);
  460         }
  461 
  462         if((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) {
  463                 err = EEXIST;
  464                 goto done;
  465         }
  466         /*
  467          * Allocate the unit in the bitmap.
  468          */
  469         KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
  470             ("%s: bit is already set", __func__));
  471         ifc->ifc_units[bytoff] |= (1 << bitoff);
  472         IF_CLONE_ADDREF_LOCKED(ifc);
  473 
  474 done:
  475         IF_CLONE_UNLOCK(ifc);
  476         return (err);
  477 }
  478 
  479 void
  480 ifc_free_unit(struct if_clone *ifc, int unit)
  481 {
  482         int bytoff, bitoff;
  483 
  484 
  485         /*
  486          * Compute offset in the bitmap and deallocate the unit.
  487          */
  488         bytoff = unit >> 3;
  489         bitoff = unit - (bytoff << 3);
  490 
  491         IF_CLONE_LOCK(ifc);
  492         KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
  493             ("%s: bit is already cleared", __func__));
  494         ifc->ifc_units[bytoff] &= ~(1 << bitoff);
  495         IF_CLONE_REMREF_LOCKED(ifc);    /* releases lock */
  496 }
  497 
  498 void
  499 ifc_simple_attach(struct if_clone *ifc)
  500 {
  501         int err;
  502         int unit;
  503         char name[IFNAMSIZ];
  504         struct ifc_simple_data *ifcs = ifc->ifc_data;
  505 
  506         KASSERT(ifcs->ifcs_minifs - 1 <= ifc->ifc_maxunit,
  507             ("%s: %s requested more units than allowed (%d > %d)",
  508             __func__, ifc->ifc_name, ifcs->ifcs_minifs,
  509             ifc->ifc_maxunit + 1));
  510 
  511         for (unit = 0; unit < ifcs->ifcs_minifs; unit++) {
  512                 snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit);
  513                 err = if_clone_createif(ifc, name, IFNAMSIZ, NULL);
  514                 KASSERT(err == 0,
  515                     ("%s: failed to create required interface %s",
  516                     __func__, name));
  517         }
  518 }
  519 
  520 int
  521 ifc_simple_match(struct if_clone *ifc, const char *name)
  522 {
  523         const char *cp;
  524         int i;
  525         
  526         /* Match the name */
  527         for (cp = name, i = 0; i < strlen(ifc->ifc_name); i++, cp++) {
  528                 if (ifc->ifc_name[i] != *cp)
  529                         return (0);
  530         }
  531 
  532         /* Make sure there's a unit number or nothing after the name */
  533         for (; *cp != '\0'; cp++) {
  534                 if (*cp < '' || *cp > '9')
  535                         return (0);
  536         }
  537 
  538         return (1);
  539 }
  540 
  541 int
  542 ifc_simple_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
  543 {
  544         char *dp;
  545         int wildcard;
  546         int unit;
  547         int err;
  548         struct ifc_simple_data *ifcs = ifc->ifc_data;
  549 
  550         err = ifc_name2unit(name, &unit);
  551         if (err != 0)
  552                 return (err);
  553 
  554         wildcard = (unit < 0);
  555 
  556         err = ifc_alloc_unit(ifc, &unit);
  557         if (err != 0)
  558                 return (err);
  559 
  560         err = ifcs->ifcs_create(ifc, unit, params);
  561         if (err != 0) {
  562                 ifc_free_unit(ifc, unit);
  563                 return (err);
  564         }
  565 
  566         /* In the wildcard case, we need to update the name. */
  567         if (wildcard) {
  568                 for (dp = name; *dp != '\0'; dp++);
  569                 if (snprintf(dp, len - (dp-name), "%d", unit) >
  570                     len - (dp-name) - 1) {
  571                         /*
  572                          * This can only be a programmer error and
  573                          * there's no straightforward way to recover if
  574                          * it happens.
  575                          */
  576                         panic("if_clone_create(): interface name too long");
  577                 }
  578 
  579         }
  580 
  581         return (0);
  582 }
  583 
  584 int
  585 ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp)
  586 {
  587         int unit;
  588         struct ifc_simple_data *ifcs = ifc->ifc_data;
  589 
  590         unit = ifp->if_dunit;
  591 
  592         if (unit < ifcs->ifcs_minifs) 
  593                 return (EINVAL);
  594 
  595         ifcs->ifcs_destroy(ifp);
  596 
  597         ifc_free_unit(ifc, unit);
  598 
  599         return (0);
  600 }

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