smb_dev.c

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    1 /*-
    2  * Copyright (c) 2000-2001 Boris Popov
    3  * 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  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  */
   26 
   27 #include <sys/cdefs.h>
   28 __FBSDID("$FreeBSD: releng/11.2/sys/netsmb/smb_dev.c 263233 2014-03-16 10:55:57Z rwatson $");
   29 
   30 #include <sys/param.h>
   31 #include <sys/kernel.h>
   32 #include <sys/capsicum.h>
   33 #include <sys/module.h>
   34 #include <sys/systm.h>
   35 #include <sys/conf.h>
   36 #include <sys/fcntl.h>
   37 #include <sys/ioccom.h>
   38 #include <sys/lock.h>
   39 #include <sys/malloc.h>
   40 #include <sys/file.h>           /* Must come after sys/malloc.h */
   41 #include <sys/filedesc.h>
   42 #include <sys/mbuf.h>
   43 #include <sys/poll.h>
   44 #include <sys/proc.h>
   45 #include <sys/select.h>
   46 #include <sys/socket.h>
   47 #include <sys/socketvar.h>
   48 #include <sys/sysctl.h>
   49 #include <sys/uio.h>
   50 #include <sys/vnode.h>
   51 
   52 #include <net/if.h>
   53 
   54 #include <netsmb/smb.h>
   55 #include <netsmb/smb_conn.h>
   56 #include <netsmb/smb_subr.h>
   57 #include <netsmb/smb_dev.h>
   58 
   59 static struct cdev *nsmb_dev;
   60 
   61 static d_open_t  nsmb_dev_open;
   62 static d_ioctl_t nsmb_dev_ioctl;
   63 
   64 MODULE_DEPEND(netsmb, libiconv, 1, 1, 2);
   65 MODULE_VERSION(netsmb, NSMB_VERSION);
   66 
   67 static int smb_version = NSMB_VERSION;
   68 struct sx smb_lock;
   69 
   70 
   71 SYSCTL_DECL(_net_smb);
   72 SYSCTL_INT(_net_smb, OID_AUTO, version, CTLFLAG_RD, &smb_version, 0, "");
   73 
   74 static MALLOC_DEFINE(M_NSMBDEV, "NETSMBDEV", "NET/SMB device");
   75 
   76 static struct cdevsw nsmb_cdevsw = {
   77         .d_version =    D_VERSION,
   78         .d_open =       nsmb_dev_open,
   79         .d_ioctl =      nsmb_dev_ioctl,
   80         .d_name =       NSMB_NAME
   81 };
   82 
   83 static int
   84 nsmb_dev_init(void)
   85 {
   86 
   87         nsmb_dev = make_dev(&nsmb_cdevsw, 0, UID_ROOT, GID_OPERATOR,
   88             0600, "nsmb");
   89         if (nsmb_dev == NULL)
   90                 return (ENOMEM);  
   91         return (0);
   92 }
   93 
   94 static void 
   95 nsmb_dev_destroy(void)
   96 {
   97 
   98         MPASS(nsmb_dev != NULL);
   99         destroy_dev(nsmb_dev);
  100         nsmb_dev = NULL;
  101 }
  102 
  103 static struct smb_dev *
  104 smbdev_alloc(struct cdev *dev)
  105 {
  106         struct smb_dev *sdp;
  107 
  108         sdp = malloc(sizeof(struct smb_dev), M_NSMBDEV, M_WAITOK | M_ZERO);
  109         sdp->dev = dev; 
  110         sdp->sd_level = -1;
  111         sdp->sd_flags |= NSMBFL_OPEN;
  112         sdp->refcount = 1;
  113         return (sdp);   
  114 } 
  115 
  116 void
  117 sdp_dtor(void *arg)
  118 {
  119         struct smb_dev *dev;
  120 
  121         dev = (struct smb_dev *)arg;    
  122         SMB_LOCK();
  123         sdp_trydestroy(dev);
  124         SMB_UNLOCK();
  125 }
  126 
  127 static int
  128 nsmb_dev_open(struct cdev *dev, int oflags, int devtype, struct thread *td)
  129 {
  130         struct smb_dev *sdp;
  131         int error;
  132 
  133         sdp = smbdev_alloc(dev);
  134         error = devfs_set_cdevpriv(sdp, sdp_dtor);
  135         if (error) {
  136                 free(sdp, M_NSMBDEV);   
  137                 return (error);
  138         }
  139         return (0);
  140 }
  141 
  142 void
  143 sdp_trydestroy(struct smb_dev *sdp)
  144 {
  145         struct smb_vc *vcp;
  146         struct smb_share *ssp;
  147         struct smb_cred *scred;
  148 
  149         SMB_LOCKASSERT();
  150         if (!sdp)
  151                 panic("No smb_dev upon device close");
  152         MPASS(sdp->refcount > 0);
  153         sdp->refcount--;
  154         if (sdp->refcount) 
  155                 return;
  156         scred = malloc(sizeof(struct smb_cred), M_NSMBDEV, M_WAITOK);
  157         smb_makescred(scred, curthread, NULL);
  158         ssp = sdp->sd_share;
  159         if (ssp != NULL) {
  160                 smb_share_lock(ssp);
  161                 smb_share_rele(ssp, scred);
  162         }
  163         vcp = sdp->sd_vc;
  164         if (vcp != NULL) {
  165                 smb_vc_lock(vcp);
  166                 smb_vc_rele(vcp, scred);
  167         }
  168         free(scred, M_NSMBDEV);
  169         free(sdp, M_NSMBDEV);
  170         return;
  171 }
  172 
  173 
  174 static int
  175 nsmb_dev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int flag, struct thread *td)
  176 {
  177         struct smb_dev *sdp;
  178         struct smb_vc *vcp;
  179         struct smb_share *ssp;
  180         struct smb_cred *scred;
  181         int error = 0;
  182 
  183         error = devfs_get_cdevpriv((void **)&sdp);
  184         if (error)
  185                 return (error);
  186         scred = malloc(sizeof(struct smb_cred), M_NSMBDEV, M_WAITOK);
  187         SMB_LOCK();
  188         smb_makescred(scred, td, NULL);
  189         switch (cmd) {
  190             case SMBIOC_OPENSESSION:
  191                 if (sdp->sd_vc) {
  192                         error = EISCONN;
  193                         goto out;
  194                 }
  195                 error = smb_usr_opensession((struct smbioc_ossn*)data,
  196                     scred, &vcp);
  197                 if (error)
  198                         break;
  199                 sdp->sd_vc = vcp;
  200                 smb_vc_unlock(vcp);
  201                 sdp->sd_level = SMBL_VC;
  202                 break;
  203             case SMBIOC_OPENSHARE:
  204                 if (sdp->sd_share) {
  205                         error = EISCONN;
  206                         goto out;
  207                 }
  208                 if (sdp->sd_vc == NULL) {
  209                         error = ENOTCONN;
  210                         goto out;
  211                 }
  212                 error = smb_usr_openshare(sdp->sd_vc,
  213                     (struct smbioc_oshare*)data, scred, &ssp);
  214                 if (error)
  215                         break;
  216                 sdp->sd_share = ssp;
  217                 smb_share_unlock(ssp);
  218                 sdp->sd_level = SMBL_SHARE;
  219                 break;
  220             case SMBIOC_REQUEST:
  221                 if (sdp->sd_share == NULL) {
  222                         error = ENOTCONN;
  223                         goto out;
  224                 }
  225                 error = smb_usr_simplerequest(sdp->sd_share,
  226                     (struct smbioc_rq*)data, scred);
  227                 break;
  228             case SMBIOC_T2RQ:
  229                 if (sdp->sd_share == NULL) {
  230                         error = ENOTCONN;
  231                         goto out;
  232                 }
  233                 error = smb_usr_t2request(sdp->sd_share,
  234                     (struct smbioc_t2rq*)data, scred);
  235                 break;
  236             case SMBIOC_SETFLAGS: {
  237                 struct smbioc_flags *fl = (struct smbioc_flags*)data;
  238                 int on;
  239         
  240                 if (fl->ioc_level == SMBL_VC) {
  241                         if (fl->ioc_mask & SMBV_PERMANENT) {
  242                                 on = fl->ioc_flags & SMBV_PERMANENT;
  243                                 if ((vcp = sdp->sd_vc) == NULL) {
  244                                         error = ENOTCONN;
  245                                         goto out;
  246                                 }
  247                                 error = smb_vc_get(vcp, scred);
  248                                 if (error)
  249                                         break;
  250                                 if (on && (vcp->obj.co_flags & SMBV_PERMANENT) == 0) {
  251                                         vcp->obj.co_flags |= SMBV_PERMANENT;
  252                                         smb_vc_ref(vcp);
  253                                 } else if (!on && (vcp->obj.co_flags & SMBV_PERMANENT)) {
  254                                         vcp->obj.co_flags &= ~SMBV_PERMANENT;
  255                                         smb_vc_rele(vcp, scred);
  256                                 }
  257                                 smb_vc_put(vcp, scred);
  258                         } else
  259                                 error = EINVAL;
  260                 } else if (fl->ioc_level == SMBL_SHARE) {
  261                         if (fl->ioc_mask & SMBS_PERMANENT) {
  262                                 on = fl->ioc_flags & SMBS_PERMANENT;
  263                                 if ((ssp = sdp->sd_share) == NULL) {
  264                                         error = ENOTCONN;
  265                                         goto out;
  266                                 }
  267                                 error = smb_share_get(ssp, scred);
  268                                 if (error)
  269                                         break;
  270                                 if (on && (ssp->obj.co_flags & SMBS_PERMANENT) == 0) {
  271                                         ssp->obj.co_flags |= SMBS_PERMANENT;
  272                                         smb_share_ref(ssp);
  273                                 } else if (!on && (ssp->obj.co_flags & SMBS_PERMANENT)) {
  274                                         ssp->obj.co_flags &= ~SMBS_PERMANENT;
  275                                         smb_share_rele(ssp, scred);
  276                                 }
  277                                 smb_share_put(ssp, scred);
  278                         } else
  279                                 error = EINVAL;
  280                         break;
  281                 } else
  282                         error = EINVAL;
  283                 break;
  284             }
  285             case SMBIOC_LOOKUP:
  286                 if (sdp->sd_vc || sdp->sd_share) {
  287                         error = EISCONN;
  288                         goto out;
  289                 }
  290                 vcp = NULL;
  291                 ssp = NULL;
  292                 error = smb_usr_lookup((struct smbioc_lookup*)data, scred, &vcp, &ssp);
  293                 if (error)
  294                         break;
  295                 if (vcp) {
  296                         sdp->sd_vc = vcp;
  297                         smb_vc_unlock(vcp);
  298                         sdp->sd_level = SMBL_VC;
  299                 }
  300                 if (ssp) {
  301                         sdp->sd_share = ssp;
  302                         smb_share_unlock(ssp);
  303                         sdp->sd_level = SMBL_SHARE;
  304                 }
  305                 break;
  306             case SMBIOC_READ: case SMBIOC_WRITE: {
  307                 struct smbioc_rw *rwrq = (struct smbioc_rw*)data;
  308                 struct uio auio;
  309                 struct iovec iov;
  310         
  311                 if ((ssp = sdp->sd_share) == NULL) {
  312                         error = ENOTCONN;
  313                         goto out;
  314                 }
  315                 iov.iov_base = rwrq->ioc_base;
  316                 iov.iov_len = rwrq->ioc_cnt;
  317                 auio.uio_iov = &iov;
  318                 auio.uio_iovcnt = 1;
  319                 auio.uio_offset = rwrq->ioc_offset;
  320                 auio.uio_resid = rwrq->ioc_cnt;
  321                 auio.uio_segflg = UIO_USERSPACE;
  322                 auio.uio_rw = (cmd == SMBIOC_READ) ? UIO_READ : UIO_WRITE;
  323                 auio.uio_td = td;
  324                 if (cmd == SMBIOC_READ)
  325                         error = smb_read(ssp, rwrq->ioc_fh, &auio, scred);
  326                 else
  327                         error = smb_write(ssp, rwrq->ioc_fh, &auio, scred);
  328                 rwrq->ioc_cnt -= auio.uio_resid;
  329                 break;
  330             }
  331             default:
  332                 error = ENODEV;
  333         }
  334 out:
  335         free(scred, M_NSMBDEV);
  336         SMB_UNLOCK();
  337         return error;
  338 }
  339 
  340 static int
  341 nsmb_dev_load(module_t mod, int cmd, void *arg)
  342 {
  343         int error = 0;
  344 
  345         switch (cmd) {
  346             case MOD_LOAD:
  347                 error = smb_sm_init();
  348                 if (error)
  349                         break;
  350                 error = smb_iod_init();
  351                 if (error) {
  352                         smb_sm_done();
  353                         break;
  354                 }
  355                 error = nsmb_dev_init();
  356                 if (error)
  357                         break;
  358                 sx_init(&smb_lock, "samba device lock");
  359                 break;
  360             case MOD_UNLOAD:
  361                 smb_iod_done();
  362                 error = smb_sm_done();
  363                 if (error)
  364                         break;
  365                 nsmb_dev_destroy();
  366                 sx_destroy(&smb_lock);
  367                 break;
  368             default:
  369                 error = EINVAL;
  370                 break;
  371         }
  372         return error;
  373 }
  374 
  375 DEV_MODULE (dev_netsmb, nsmb_dev_load, 0);
  376 
  377 int
  378 smb_dev2share(int fd, int mode, struct smb_cred *scred,
  379         struct smb_share **sspp, struct smb_dev **ssdp)
  380 {
  381         cap_rights_t rights;
  382         struct file *fp, *fptmp;
  383         struct smb_dev *sdp;
  384         struct smb_share *ssp;
  385         struct thread *td;
  386         int error;
  387 
  388         td = curthread;
  389         error = fget(td, fd, cap_rights_init(&rights, CAP_READ), &fp);
  390         if (error)
  391                 return (error);
  392         fptmp = td->td_fpop;
  393         td->td_fpop = fp;
  394         error = devfs_get_cdevpriv((void **)&sdp);
  395         td->td_fpop = fptmp;
  396         fdrop(fp, td);
  397         if (error || sdp == NULL)
  398                 return (error);
  399         SMB_LOCK();
  400         *ssdp = sdp;
  401         ssp = sdp->sd_share;
  402         if (ssp == NULL) {
  403                 SMB_UNLOCK();
  404                 return (ENOTCONN);
  405         }
  406         error = smb_share_get(ssp, scred);
  407         if (error == 0) {
  408                 sdp->refcount++;
  409                 *sspp = ssp;
  410         }
  411         SMB_UNLOCK();
  412         return error;
  413 }
  414
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FreeBSD/Linux Kernel Cross Reference sys/netsmb/smb_dev.c

FreeBSD/Linux Kernel Cross Reference
sys/netsmb/smb_dev.c
