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/8.1/sys/net/if_clone.c 207015 2010-04-21 20:00:13Z bz $
   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         int err;
  200         struct if_clone *ifc;
  201         struct ifnet *ifp;
  202 
  203         ifp = ifunit_ref(name);
  204         if (ifp == NULL)
  205                 return (ENXIO);
  206 
  207         /* Find the cloner for this interface */
  208         IF_CLONERS_LOCK();
  209         LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
  210                 if (strcmp(ifc->ifc_name, ifp->if_dname) == 0) {
  211                         break;
  212                 }
  213         }
  214 #ifdef VIMAGE
  215         if (ifc == NULL && !IS_DEFAULT_VNET(curvnet)) {
  216                 CURVNET_SET_QUIET(vnet0);
  217                 LIST_FOREACH(ifc, &V_if_cloners, ifc_list) {
  218                         if (ifc->ifc_match(ifc, name))
  219                                 break;
  220                 }
  221                 CURVNET_RESTORE();
  222         }
  223 #endif
  224         IF_CLONERS_UNLOCK();
  225         if (ifc == NULL) {
  226                 if_rele(ifp);
  227                 return (EINVAL);
  228         }
  229 
  230         err = if_clone_destroyif(ifc, ifp);
  231         if_rele(ifp);
  232         return err;
  233 }
  234 
  235 /*
  236  * Destroy a clone network interface.
  237  */
  238 int
  239 if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp)
  240 {
  241         int err;
  242         struct ifnet *ifcifp;
  243 
  244         if (ifc->ifc_destroy == NULL)
  245                 return(EOPNOTSUPP);
  246 
  247         /*
  248          * Given that the cloned ifnet might be attached to a different
  249          * vnet from where its cloner was registered, we have to
  250          * switch to the vnet context of the target vnet.
  251          */
  252         CURVNET_SET_QUIET(ifp->if_vnet);
  253 
  254         IF_CLONE_LOCK(ifc);
  255         LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
  256                 if (ifcifp == ifp) {
  257                         IFC_IFLIST_REMOVE(ifc, ifp);
  258                         break;
  259                 }
  260         }
  261         IF_CLONE_UNLOCK(ifc);
  262         if (ifcifp == NULL) {
  263                 CURVNET_RESTORE();
  264                 return (ENXIO);         /* ifp is not on the list. */
  265         }
  266 
  267         if_delgroup(ifp, ifc->ifc_name);
  268 
  269         err =  (*ifc->ifc_destroy)(ifc, ifp);
  270 
  271         if (err != 0) {
  272                 if_addgroup(ifp, ifc->ifc_name);
  273 
  274                 IF_CLONE_LOCK(ifc);
  275                 IFC_IFLIST_INSERT(ifc, ifp);
  276                 IF_CLONE_UNLOCK(ifc);
  277         }
  278         CURVNET_RESTORE();
  279         return (err);
  280 }
  281 
  282 /*
  283  * Register a network interface cloner.
  284  */
  285 void
  286 if_clone_attach(struct if_clone *ifc)
  287 {
  288         int len, maxclone;
  289 
  290         /*
  291          * Compute bitmap size and allocate it.
  292          */
  293         maxclone = ifc->ifc_maxunit + 1;
  294         len = maxclone >> 3;
  295         if ((len << 3) < maxclone)
  296                 len++;
  297         ifc->ifc_units = malloc(len, M_CLONE, M_WAITOK | M_ZERO);
  298         ifc->ifc_bmlen = len;
  299         IF_CLONE_LOCK_INIT(ifc);
  300         IF_CLONE_ADDREF(ifc);
  301 
  302         IF_CLONERS_LOCK();
  303         LIST_INSERT_HEAD(&V_if_cloners, ifc, ifc_list);
  304         V_if_cloners_count++;
  305         IF_CLONERS_UNLOCK();
  306 
  307         LIST_INIT(&ifc->ifc_iflist);
  308 
  309         if (ifc->ifc_attach != NULL)
  310                 (*ifc->ifc_attach)(ifc);
  311         EVENTHANDLER_INVOKE(if_clone_event, ifc);
  312 }
  313 
  314 /*
  315  * Unregister a network interface cloner.
  316  */
  317 void
  318 if_clone_detach(struct if_clone *ifc)
  319 {
  320         struct ifc_simple_data *ifcs = ifc->ifc_data;
  321 
  322         IF_CLONERS_LOCK();
  323         LIST_REMOVE(ifc, ifc_list);
  324         V_if_cloners_count--;
  325         IF_CLONERS_UNLOCK();
  326 
  327         /* Allow all simples to be destroyed */
  328         if (ifc->ifc_attach == ifc_simple_attach)
  329                 ifcs->ifcs_minifs = 0;
  330 
  331         /* destroy all interfaces for this cloner */
  332         while (!LIST_EMPTY(&ifc->ifc_iflist))
  333                 if_clone_destroyif(ifc, LIST_FIRST(&ifc->ifc_iflist));
  334         
  335         IF_CLONE_REMREF(ifc);
  336 }
  337 
  338 static void
  339 if_clone_free(struct if_clone *ifc)
  340 {
  341         for (int bytoff = 0; bytoff < ifc->ifc_bmlen; bytoff++) {
  342                 KASSERT(ifc->ifc_units[bytoff] == 0x00,
  343                     ("ifc_units[%d] is not empty", bytoff));
  344         }
  345 
  346         KASSERT(LIST_EMPTY(&ifc->ifc_iflist),
  347             ("%s: ifc_iflist not empty", __func__));
  348 
  349         IF_CLONE_LOCK_DESTROY(ifc);
  350         free(ifc->ifc_units, M_CLONE);
  351 }
  352 
  353 /*
  354  * Provide list of interface cloners to userspace.
  355  */
  356 int
  357 if_clone_list(struct if_clonereq *ifcr)
  358 {
  359         char *buf, *dst, *outbuf = NULL;
  360         struct if_clone *ifc;
  361         int buf_count, count, err = 0;
  362 
  363         if (ifcr->ifcr_count < 0)
  364                 return (EINVAL);
  365 
  366         IF_CLONERS_LOCK();
  367         /*
  368          * Set our internal output buffer size.  We could end up not
  369          * reporting a cloner that is added between the unlock and lock
  370          * below, but that's not a major problem.  Not caping our
  371          * allocation to the number of cloners actually in the system
  372          * could be because that would let arbitrary users cause us to
  373          * allocate abritrary amounts of kernel memory.
  374          */
  375         buf_count = (V_if_cloners_count < ifcr->ifcr_count) ?
  376             V_if_cloners_count : ifcr->ifcr_count;
  377         IF_CLONERS_UNLOCK();
  378 
  379         outbuf = malloc(IFNAMSIZ*buf_count, M_CLONE, M_WAITOK | M_ZERO);
  380 
  381         IF_CLONERS_LOCK();
  382 
  383         ifcr->ifcr_total = V_if_cloners_count;
  384         if ((dst = ifcr->ifcr_buffer) == NULL) {
  385                 /* Just asking how many there are. */
  386                 goto done;
  387         }
  388         count = (V_if_cloners_count < buf_count) ?
  389             V_if_cloners_count : buf_count;
  390 
  391         for (ifc = LIST_FIRST(&V_if_cloners), buf = outbuf;
  392             ifc != NULL && count != 0;
  393             ifc = LIST_NEXT(ifc, ifc_list), count--, buf += IFNAMSIZ) {
  394                 strlcpy(buf, ifc->ifc_name, IFNAMSIZ);
  395         }
  396 
  397 done:
  398         IF_CLONERS_UNLOCK();
  399         if (err == 0)
  400                 err = copyout(outbuf, dst, buf_count*IFNAMSIZ);
  401         if (outbuf != NULL)
  402                 free(outbuf, M_CLONE);
  403         return (err);
  404 }
  405 
  406 /*
  407  * A utility function to extract unit numbers from interface names of
  408  * the form name###.
  409  *
  410  * Returns 0 on success and an error on failure.
  411  */
  412 int
  413 ifc_name2unit(const char *name, int *unit)
  414 {
  415         const char      *cp;
  416         int             cutoff = INT_MAX / 10;
  417         int             cutlim = INT_MAX % 10;
  418 
  419         for (cp = name; *cp != '\0' && (*cp < '' || *cp > '9'); cp++);
  420         if (*cp == '\0') {
  421                 *unit = -1;
  422         } else if (cp[0] == '' && cp[1] != '\0') {
  423                 /* Disallow leading zeroes. */
  424                 return (EINVAL);
  425         } else {
  426                 for (*unit = 0; *cp != '\0'; cp++) {
  427                         if (*cp < '' || *cp > '9') {
  428                                 /* Bogus unit number. */
  429                                 return (EINVAL);
  430                         }
  431                         if (*unit > cutoff ||
  432                             (*unit == cutoff && *cp - '' > cutlim))
  433                                 return (EINVAL);
  434                         *unit = (*unit * 10) + (*cp - '');
  435                 }
  436         }
  437 
  438         return (0);
  439 }
  440 
  441 int
  442 ifc_alloc_unit(struct if_clone *ifc, int *unit)
  443 {
  444         int wildcard, bytoff, bitoff;
  445         int err = 0;
  446 
  447         IF_CLONE_LOCK(ifc);
  448 
  449         bytoff = bitoff = 0;
  450         wildcard = (*unit < 0);
  451         /*
  452          * Find a free unit if none was given.
  453          */
  454         if (wildcard) {
  455                 while ((bytoff < ifc->ifc_bmlen)
  456                     && (ifc->ifc_units[bytoff] == 0xff))
  457                         bytoff++;
  458                 if (bytoff >= ifc->ifc_bmlen) {
  459                         err = ENOSPC;
  460                         goto done;
  461                 }
  462                 while ((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0)
  463                         bitoff++;
  464                 *unit = (bytoff << 3) + bitoff;
  465         }
  466 
  467         if (*unit > ifc->ifc_maxunit) {
  468                 err = ENOSPC;
  469                 goto done;
  470         }
  471 
  472         if (!wildcard) {
  473                 bytoff = *unit >> 3;
  474                 bitoff = *unit - (bytoff << 3);
  475         }
  476 
  477         if((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0) {
  478                 err = EEXIST;
  479                 goto done;
  480         }
  481         /*
  482          * Allocate the unit in the bitmap.
  483          */
  484         KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) == 0,
  485             ("%s: bit is already set", __func__));
  486         ifc->ifc_units[bytoff] |= (1 << bitoff);
  487         IF_CLONE_ADDREF_LOCKED(ifc);
  488 
  489 done:
  490         IF_CLONE_UNLOCK(ifc);
  491         return (err);
  492 }
  493 
  494 void
  495 ifc_free_unit(struct if_clone *ifc, int unit)
  496 {
  497         int bytoff, bitoff;
  498 
  499 
  500         /*
  501          * Compute offset in the bitmap and deallocate the unit.
  502          */
  503         bytoff = unit >> 3;
  504         bitoff = unit - (bytoff << 3);
  505 
  506         IF_CLONE_LOCK(ifc);
  507         KASSERT((ifc->ifc_units[bytoff] & (1 << bitoff)) != 0,
  508             ("%s: bit is already cleared", __func__));
  509         ifc->ifc_units[bytoff] &= ~(1 << bitoff);
  510         IF_CLONE_REMREF_LOCKED(ifc);    /* releases lock */
  511 }
  512 
  513 void
  514 ifc_simple_attach(struct if_clone *ifc)
  515 {
  516         int err;
  517         int unit;
  518         char name[IFNAMSIZ];
  519         struct ifc_simple_data *ifcs = ifc->ifc_data;
  520 
  521         KASSERT(ifcs->ifcs_minifs - 1 <= ifc->ifc_maxunit,
  522             ("%s: %s requested more units than allowed (%d > %d)",
  523             __func__, ifc->ifc_name, ifcs->ifcs_minifs,
  524             ifc->ifc_maxunit + 1));
  525 
  526         for (unit = 0; unit < ifcs->ifcs_minifs; unit++) {
  527                 snprintf(name, IFNAMSIZ, "%s%d", ifc->ifc_name, unit);
  528                 err = if_clone_createif(ifc, name, IFNAMSIZ, NULL);
  529                 KASSERT(err == 0,
  530                     ("%s: failed to create required interface %s",
  531                     __func__, name));
  532         }
  533 }
  534 
  535 int
  536 ifc_simple_match(struct if_clone *ifc, const char *name)
  537 {
  538         const char *cp;
  539         int i;
  540         
  541         /* Match the name */
  542         for (cp = name, i = 0; i < strlen(ifc->ifc_name); i++, cp++) {
  543                 if (ifc->ifc_name[i] != *cp)
  544                         return (0);
  545         }
  546 
  547         /* Make sure there's a unit number or nothing after the name */
  548         for (; *cp != '\0'; cp++) {
  549                 if (*cp < '' || *cp > '9')
  550                         return (0);
  551         }
  552 
  553         return (1);
  554 }
  555 
  556 int
  557 ifc_simple_create(struct if_clone *ifc, char *name, size_t len, caddr_t params)
  558 {
  559         char *dp;
  560         int wildcard;
  561         int unit;
  562         int err;
  563         struct ifc_simple_data *ifcs = ifc->ifc_data;
  564 
  565         err = ifc_name2unit(name, &unit);
  566         if (err != 0)
  567                 return (err);
  568 
  569         wildcard = (unit < 0);
  570 
  571         err = ifc_alloc_unit(ifc, &unit);
  572         if (err != 0)
  573                 return (err);
  574 
  575         err = ifcs->ifcs_create(ifc, unit, params);
  576         if (err != 0) {
  577                 ifc_free_unit(ifc, unit);
  578                 return (err);
  579         }
  580 
  581         /* In the wildcard case, we need to update the name. */
  582         if (wildcard) {
  583                 for (dp = name; *dp != '\0'; dp++);
  584                 if (snprintf(dp, len - (dp-name), "%d", unit) >
  585                     len - (dp-name) - 1) {
  586                         /*
  587                          * This can only be a programmer error and
  588                          * there's no straightforward way to recover if
  589                          * it happens.
  590                          */
  591                         panic("if_clone_create(): interface name too long");
  592                 }
  593 
  594         }
  595 
  596         return (0);
  597 }
  598 
  599 int
  600 ifc_simple_destroy(struct if_clone *ifc, struct ifnet *ifp)
  601 {
  602         int unit;
  603         struct ifc_simple_data *ifcs = ifc->ifc_data;
  604 
  605         unit = ifp->if_dunit;
  606 
  607         if (unit < ifcs->ifcs_minifs) 
  608                 return (EINVAL);
  609 
  610         ifcs->ifcs_destroy(ifp);
  611 
  612         ifc_free_unit(ifc, unit);
  613 
  614         return (0);
  615 }

Cache object: b074a8207b3c3a1457ee38cead53dd4f


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