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


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

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    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/9.0/sys/fs/nfsclient/nfs_clkrpc.c 223309 2011-06-19 22:08:55Z rmacklem $");
   36 
   37 #include "opt_inet6.h"
   38 #include "opt_kgssapi.h"
   39 
   40 #include <fs/nfs/nfsport.h>
   41 
   42 #include <rpc/rpc.h>
   43 #include <rpc/rpcsec_gss.h>
   44 #include <rpc/replay.h>
   45 
   46 
   47 NFSDLOCKMUTEX;
   48 
   49 SVCPOOL         *nfscbd_pool;
   50 
   51 static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
   52 
   53 extern u_long sb_max_adj;
   54 extern int nfs_numnfscbd;
   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);
   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         if (nd.nd_procnum != NFSPROC_NULL) {
   95                 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
   96                         svcerr_weakauth(rqst);
   97                         svc_freereq(rqst);
   98                         m_freem(nd.nd_mrep);
   99                         return;
  100                 }
  101 
  102                 /* For now, I don't care what credential flavor was used. */
  103 #ifdef notyet
  104 #ifdef MAC
  105                 mac_cred_associate_nfsd(nd.nd_cred);
  106 #endif
  107 #endif
  108                 cacherep = nfs_cbproc(&nd, rqst->rq_xid);
  109         } else {
  110                 NFSMGET(nd.nd_mreq);
  111                 nd.nd_mreq->m_len = 0;
  112                 cacherep = RC_REPLY;
  113         }
  114         if (nd.nd_mrep != NULL)
  115                 m_freem(nd.nd_mrep);
  116 
  117         if (nd.nd_cred != NULL)
  118                 crfree(nd.nd_cred);
  119 
  120         if (cacherep == RC_DROPIT) {
  121                 if (nd.nd_mreq != NULL)
  122                         m_freem(nd.nd_mreq);
  123                 svc_freereq(rqst);
  124                 return;
  125         }
  126 
  127         if (nd.nd_mreq == NULL) {
  128                 svcerr_decode(rqst);
  129                 svc_freereq(rqst);
  130                 return;
  131         }
  132 
  133         if (nd.nd_repstat & NFSERR_AUTHERR) {
  134                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  135                 if (nd.nd_mreq != NULL)
  136                         m_freem(nd.nd_mreq);
  137         } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
  138                 svcerr_systemerr(rqst);
  139         }
  140         svc_freereq(rqst);
  141 }
  142 
  143 /*
  144  * Check the cache and, optionally, do the RPC.
  145  * Return the appropriate cache response.
  146  */
  147 static int
  148 nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
  149 {
  150         struct thread *td = curthread;
  151         int cacherep;
  152 
  153         if (nd->nd_nam2 == NULL)
  154                 nd->nd_flag |= ND_STREAMSOCK;
  155 
  156         nfscl_docb(nd, td);
  157         if (nd->nd_repstat == NFSERR_DONTREPLY)
  158                 cacherep = RC_DROPIT;
  159         else
  160                 cacherep = RC_REPLY;
  161         return (cacherep);
  162 }
  163 
  164 /*
  165  * Adds a socket to the list for servicing by nfscbds.
  166  */
  167 int
  168 nfscbd_addsock(struct file *fp)
  169 {
  170         int siz;
  171         struct socket *so;
  172         int error;
  173         SVCXPRT *xprt;
  174 
  175         so = fp->f_data;
  176 
  177         siz = sb_max_adj;
  178         error = soreserve(so, siz, siz);
  179         if (error)
  180                 return (error);
  181 
  182         /*
  183          * Steal the socket from userland so that it doesn't close
  184          * unexpectedly.
  185          */
  186         if (so->so_type == SOCK_DGRAM)
  187                 xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
  188         else
  189                 xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
  190         if (xprt) {
  191                 fp->f_ops = &badfileops;
  192                 fp->f_data = NULL;
  193                 svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
  194                     NULL);
  195                 SVC_RELEASE(xprt);
  196         }
  197 
  198         return (0);
  199 }
  200 
  201 /*
  202  * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
  203  * until it is killed by a signal.
  204  *
  205  * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
  206  * keytab entry with a host based entry in it on the client. (I'm not even
  207  * sure that getting Acceptor credentials for a user principal with a
  208  * credentials cache is possible, but even if it is, major changes to the
  209  * kgssapi would be required.)
  210  * I don't believe that this is a serious limitation since, as of 2009, most
  211  * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
  212  * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
  213  * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
  214  */
  215 int
  216 nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
  217 {
  218         char principal[128];
  219         int error;
  220 
  221         if (args != NULL) {
  222                 error = copyinstr(args->principal, principal,
  223                     sizeof(principal), NULL);
  224                 if (error)
  225                         return (error);
  226         } else {
  227                 principal[0] = '\0';
  228         }
  229 
  230         /*
  231          * Only the first nfsd actually does any work. The RPC code
  232          * adds threads to it as needed. Any extra processes offered
  233          * by nfsd just exit. If nfsd is new enough, it will call us
  234          * once with a structure that specifies how many threads to
  235          * use.
  236          */
  237         NFSD_LOCK();
  238         if (nfs_numnfscbd == 0) {
  239                 nfs_numnfscbd++;
  240 
  241                 NFSD_UNLOCK();
  242 
  243                 if (principal[0] != '\0')
  244                         rpc_gss_set_svc_name_call(principal, "kerberosv5",
  245                             GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
  246 
  247                 nfscbd_pool->sp_minthreads = 4;
  248                 nfscbd_pool->sp_maxthreads = 4;
  249                         
  250                 svc_run(nfscbd_pool);
  251 
  252                 rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
  253 
  254                 NFSD_LOCK();
  255                 nfs_numnfscbd--;
  256                 nfsrvd_cbinit(1);
  257         }
  258         NFSD_UNLOCK();
  259 
  260         return (0);
  261 }
  262 
  263 /*
  264  * Initialize the data structures for the server.
  265  * Handshake with any new nfsds starting up to avoid any chance of
  266  * corruption.
  267  */
  268 void
  269 nfsrvd_cbinit(int terminating)
  270 {
  271 
  272         NFSD_LOCK_ASSERT();
  273 
  274         if (terminating) {
  275                 NFSD_UNLOCK();
  276                 svcpool_destroy(nfscbd_pool);
  277                 nfscbd_pool = NULL;
  278                 NFSD_LOCK();
  279         }
  280 
  281         NFSD_UNLOCK();
  282 
  283         nfscbd_pool = svcpool_create("nfscbd", NULL);
  284         nfscbd_pool->sp_rcache = NULL;
  285         nfscbd_pool->sp_assign = NULL;
  286         nfscbd_pool->sp_done = NULL;
  287 
  288         NFSD_LOCK();
  289 }
  290 

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