The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]

FreeBSD/Linux Kernel Cross Reference
sys/fs/nfsclient/nfs_clkrpc.c

Version: -  FREEBSD  -  FREEBSD-12-STABLE  -  FREEBSD-12-0  -  FREEBSD-11-STABLE  -  FREEBSD-11-2  -  FREEBSD-11-1  -  FREEBSD-11-0  -  FREEBSD-10-STABLE  -  FREEBSD-10-4  -  FREEBSD-10-3  -  FREEBSD-10-2  -  FREEBSD-10-1  -  FREEBSD-10-0  -  FREEBSD-9-STABLE  -  FREEBSD-9-3  -  FREEBSD-9-2  -  FREEBSD-9-1  -  FREEBSD-9-0  -  FREEBSD-8-STABLE  -  FREEBSD-8-4  -  FREEBSD-8-3  -  FREEBSD-8-2  -  FREEBSD-8-1  -  FREEBSD-8-0  -  FREEBSD-7-STABLE  -  FREEBSD-7-4  -  FREEBSD-7-3  -  FREEBSD-7-2  -  FREEBSD-7-1  -  FREEBSD-7-0  -  FREEBSD-6-STABLE  -  FREEBSD-6-4  -  FREEBSD-6-3  -  FREEBSD-6-2  -  FREEBSD-6-1  -  FREEBSD-6-0  -  FREEBSD-5-STABLE  -  FREEBSD-5-5  -  FREEBSD-5-4  -  FREEBSD-5-3  -  FREEBSD-5-2  -  FREEBSD-5-1  -  FREEBSD-5-0  -  FREEBSD-4-STABLE  -  FREEBSD-3-STABLE  -  FREEBSD22  -  linux-2.6  -  linux-2.4.22  -  MK83  -  MK84  -  PLAN9  -  DFBSD  -  NETBSD  -  NETBSD5  -  NETBSD4  -  NETBSD3  -  NETBSD20  -  OPENBSD  -  xnu-517  -  xnu-792  -  xnu-792.6.70  -  xnu-1228  -  xnu-1456.1.26  -  xnu-1699.24.8  -  xnu-2050.18.24  -  OPENSOLARIS  -  minix-3-1-1 
SearchContext: -  none  -  3  -  10 

    1 /*-
    2  * Copyright (c) 1989, 1993
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * This code is derived from software contributed to Berkeley by
    6  * Rick Macklem at The University of Guelph.
    7  *
    8  * Redistribution and use in source and binary forms, with or without
    9  * modification, are permitted provided that the following conditions
   10  * are met:
   11  * 1. Redistributions of source code must retain the above copyright
   12  *    notice, this list of conditions and the following disclaimer.
   13  * 2. Redistributions in binary form must reproduce the above copyright
   14  *    notice, this list of conditions and the following disclaimer in the
   15  *    documentation and/or other materials provided with the distribution.
   16  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  *
   32  */
   33 
   34 #include <sys/cdefs.h>
   35 __FBSDID("$FreeBSD: releng/10.4/sys/fs/nfsclient/nfs_clkrpc.c 317524 2017-04-27 21:27:20Z rmacklem $");
   36 
   37 #include "opt_kgssapi.h"
   38 
   39 #include <fs/nfs/nfsport.h>
   40 
   41 #include <rpc/rpc.h>
   42 #include <rpc/rpcsec_gss.h>
   43 #include <rpc/replay.h>
   44 
   45 
   46 NFSDLOCKMUTEX;
   47 
   48 extern SVCPOOL  *nfscbd_pool;
   49 
   50 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
   51 
   52 extern u_long sb_max_adj;
   53 extern int nfs_numnfscbd;
   54 extern int nfscl_debuglevel;
   55 
   56 /*
   57  * NFS client system calls for handling callbacks.
   58  */
   59 
   60 /*
   61  * Handles server to client callbacks.
   62  */
   63 static void
   64 nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
   65 {
   66         struct nfsrv_descript nd;
   67         int cacherep, credflavor;
   68 
   69         memset(&nd, 0, sizeof(nd));
   70         if (rqst->rq_proc != NFSPROC_NULL &&
   71             rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
   72                 svcerr_noproc(rqst);
   73                 svc_freereq(rqst);
   74                 return;
   75         }
   76         nd.nd_procnum = rqst->rq_proc;
   77         nd.nd_flag = (ND_NFSCB | ND_NFSV4);
   78 
   79         /*
   80          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
   81          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
   82          * mounts.
   83          */
   84         nd.nd_mrep = rqst->rq_args;
   85         rqst->rq_args = NULL;
   86         newnfs_realign(&nd.nd_mrep, M_WAITOK);
   87         nd.nd_md = nd.nd_mrep;
   88         nd.nd_dpos = mtod(nd.nd_md, caddr_t);
   89         nd.nd_nam = svc_getrpccaller(rqst);
   90         nd.nd_nam2 = rqst->rq_addr;
   91         nd.nd_mreq = NULL;
   92         nd.nd_cred = NULL;
   93 
   94         NFSCL_DEBUG(1, "cbproc=%d\n",nd.nd_procnum);
   95         if (nd.nd_procnum != NFSPROC_NULL) {
   96                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
   97                         svcerr_weakauth(rqst);
   98                         svc_freereq(rqst);
   99                         m_freem(nd.nd_mrep);
  100                         return;
  101                 }
  102 
  103                 /* For now, I don't care what credential flavor was used. */
  104 #ifdef notyet
  105 #ifdef MAC
  106                 mac_cred_associate_nfsd(nd.nd_cred);
  107 #endif
  108 #endif
  109                 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
  110         } else {
  111                 NFSMGET(nd.nd_mreq);
  112                 nd.nd_mreq->m_len = 0;
  113                 cacherep = RC_REPLY;
  114         }
  115         if (nd.nd_mrep != NULL)
  116                 m_freem(nd.nd_mrep);
  117 
  118         if (nd.nd_cred != NULL)
  119                 crfree(nd.nd_cred);
  120 
  121         if (cacherep == RC_DROPIT) {
  122                 if (nd.nd_mreq != NULL)
  123                         m_freem(nd.nd_mreq);
  124                 svc_freereq(rqst);
  125                 return;
  126         }
  127 
  128         if (nd.nd_mreq == NULL) {
  129                 svcerr_decode(rqst);
  130                 svc_freereq(rqst);
  131                 return;
  132         }
  133 
  134         if (nd.nd_repstat & NFSERR_AUTHERR) {
  135                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  136                 if (nd.nd_mreq != NULL)
  137                         m_freem(nd.nd_mreq);
  138         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq))
  139                 svcerr_systemerr(rqst);
  140         else
  141                 NFSCL_DEBUG(1, "cbrep sent\n");
  142         svc_freereq(rqst);
  143 }
  144 
  145 /*
  146  * Check the cache and, optionally, do the RPC.
  147  * Return the appropriate cache response.
  148  */
  149 static int
  150 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
  151 {
  152         struct thread *td = curthread;
  153         int cacherep;
  154 
  155         if (nd->nd_nam2 == NULL)
  156                 nd->nd_flag |= ND_STREAMSOCK;
  157 
  158         nfscl_docb(nd, td);
  159         if (nd->nd_repstat == NFSERR_DONTREPLY)
  160                 cacherep = RC_DROPIT;
  161         else
  162                 cacherep = RC_REPLY;
  163         return (cacherep);
  164 }
  165 
  166 /*
  167  * Adds a socket to the list for servicing by nfscbds.
  168  */
  169 int
  170 nfscbd_addsock(struct file *fp)
  171 {
  172         int siz;
  173         struct socket *so;
  174         int error;
  175         SVCXPRT *xprt;
  176 
  177         so = fp->f_data;
  178 
  179         siz = sb_max_adj;
  180         error = soreserve(so, siz, siz);
  181         if (error)
  182                 return (error);
  183 
  184         /*
  185          * Steal the socket from userland so that it doesn't close
  186          * unexpectedly.
  187          */
  188         if (so->so_type == SOCK_DGRAM)
  189                 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
  190         else
  191                 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
  192         if (xprt) {
  193                 fp->f_ops = &badfileops;
  194                 fp->f_data = NULL;
  195                 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
  196                     NULL);
  197                 SVC_RELEASE(xprt);
  198         }
  199 
  200         return (0);
  201 }
  202 
  203 /*
  204  * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
  205  * until it is killed by a signal.
  206  *
  207  * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
  208  * keytab entry with a host based entry in it on the client. (I'm not even
  209  * sure that getting Acceptor credentials for a user principal with a
  210  * credentials cache is possible, but even if it is, major changes to the
  211  * kgssapi would be required.)
  212  * I don't believe that this is a serious limitation since, as of 2009, most
  213  * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
  214  * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
  215  * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
  216  */
  217 int
  218 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
  219 {
  220         char principal[128];
  221         int error;
  222 
  223         if (args != NULL) {
  224                 error = copyinstr(args->principal, principal,
  225                     sizeof(principal), NULL);
  226                 if (error)
  227                         return (error);
  228         } else {
  229                 principal[0] = '\0';
  230         }
  231 
  232         /*
  233          * Only the first nfsd actually does any work. The RPC code
  234          * adds threads to it as needed. Any extra processes offered
  235          * by nfsd just exit. If nfsd is new enough, it will call us
  236          * once with a structure that specifies how many threads to
  237          * use.
  238          */
  239         NFSD_LOCK();
  240         if (nfs_numnfscbd == 0) {
  241                 nfs_numnfscbd++;
  242 
  243                 NFSD_UNLOCK();
  244 
  245                 if (principal[0] != '\0')
  246                         rpc_gss_set_svc_name_call(principal, "kerberosv5",
  247                             GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
  248 
  249                 nfscbd_pool->sp_minthreads = 4;
  250                 nfscbd_pool->sp_maxthreads = 4;
  251                         
  252                 svc_run(nfscbd_pool);
  253 
  254                 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
  255 
  256                 NFSD_LOCK();
  257                 nfs_numnfscbd--;
  258                 nfsrvd_cbinit(1);
  259         }
  260         NFSD_UNLOCK();
  261 
  262         return (0);
  263 }
  264 
  265 /*
  266  * Initialize the data structures for the server.
  267  * Handshake with any new nfsds starting up to avoid any chance of
  268  * corruption.
  269  */
  270 void
  271 nfsrvd_cbinit(int terminating)
  272 {
  273 
  274         NFSD_LOCK_ASSERT();
  275 
  276         if (terminating) {
  277                 /* Wait for any xprt registrations to complete. */
  278                 while (nfs_numnfscbd > 0)
  279                         msleep(&nfs_numnfscbd, NFSDLOCKMUTEXPTR, PZERO, 
  280                             "nfscbdt", 0);
  281                 if (nfscbd_pool != NULL) {
  282                         NFSD_UNLOCK();
  283                         svcpool_close(nfscbd_pool);
  284                         NFSD_LOCK();
  285                 }
  286         }
  287 
  288         if (nfscbd_pool == NULL) {
  289                 NFSD_UNLOCK();
  290                 nfscbd_pool = svcpool_create("nfscbd", NULL);
  291                 nfscbd_pool->sp_rcache = NULL;
  292                 nfscbd_pool->sp_assign = NULL;
  293                 nfscbd_pool->sp_done = NULL;
  294                 NFSD_LOCK();
  295         }
  296 }
  297 

Cache object: 248e18657b239da0185295d445570814


[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]


This page is part of the FreeBSD/Linux Linux Kernel Cross-Reference, and was automatically generated using a modified version of the LXR engine.