nfs_srvkrpc.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  *      @(#)nfs_syscalls.c      8.5 (Berkeley) 3/30/95
   33  */
   34 
   35 #include <sys/cdefs.h>
   36 __FBSDID("$FreeBSD$");
   37 
   38 #include "opt_inet6.h"
   39 #include "opt_kgssapi.h"
   40 
   41 #include <sys/param.h>
   42 #include <sys/capability.h>
   43 #include <sys/systm.h>
   44 #include <sys/sysproto.h>
   45 #include <sys/kernel.h>
   46 #include <sys/sysctl.h>
   47 #include <sys/file.h>
   48 #include <sys/filedesc.h>
   49 #include <sys/jail.h>
   50 #include <sys/vnode.h>
   51 #include <sys/malloc.h>
   52 #include <sys/mount.h>
   53 #include <sys/priv.h>
   54 #include <sys/proc.h>
   55 #include <sys/bio.h>
   56 #include <sys/buf.h>
   57 #include <sys/mbuf.h>
   58 #include <sys/socket.h>
   59 #include <sys/socketvar.h>
   60 #include <sys/domain.h>
   61 #include <sys/protosw.h>
   62 #include <sys/namei.h>
   63 #include <sys/fcntl.h>
   64 #include <sys/lockf.h>
   65 #include <sys/eventhandler.h>
   66 
   67 #include <netinet/in.h>
   68 #include <netinet/tcp.h>
   69 #ifdef INET6
   70 #include <net/if.h>
   71 #include <netinet6/in6_var.h>
   72 #endif
   73 
   74 #include <rpc/rpc.h>
   75 #include <rpc/rpcsec_gss.h>
   76 #include <rpc/replay.h>
   77 
   78 #include <nfs/xdr_subs.h>
   79 #include <nfs/nfsproto.h>
   80 #include <nfs/nfs_fha.h>
   81 #include <nfsserver/nfs.h>
   82 #include <nfsserver/nfsm_subs.h>
   83 #include <nfsserver/nfsrvcache.h>
   84 #include <nfsserver/nfs_fha_old.h>
   85 
   86 #include <security/mac/mac_framework.h>
   87 
   88 static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure");
   89 
   90 MALLOC_DEFINE(M_NFSRVDESC, "nfss_srvdesc", "NFS server socket descriptor");
   91 MALLOC_DEFINE(M_NFSD, "nfss_daemon", "Nfs server daemon structure");
   92 
   93 #define TRUE    1
   94 #define FALSE   0
   95 
   96 SYSCTL_DECL(_vfs_nfsrv);
   97 
   98 SVCPOOL         *nfsrv_pool;
   99 int             nfsd_waiting = 0;
  100 int             nfsrv_numnfsd = 0;
  101 struct callout  nfsrv_callout;
  102 static eventhandler_tag nfsrv_nmbclusters_tag;
  103 
  104 static int      nfs_privport = 0;
  105 SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
  106     &nfs_privport, 0,
  107     "Only allow clients using a privileged port");
  108 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
  109     &nfsrvw_procrastinate, 0,
  110     "Delay value for write gathering");
  111 SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
  112     &nfsrvw_procrastinate_v3, 0,
  113     "Delay in seconds for NFSv3 write gathering");
  114 
  115 static int      nfssvc_addsock(struct file *, struct thread *);
  116 static int      nfssvc_nfsd(struct thread *, struct nfsd_nfsd_args *);
  117 
  118 extern u_long sb_max_adj;
  119 
  120 int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
  121     struct nfssvc_sock *slp, struct mbuf **mreqp) = {
  122         nfsrv_null,
  123         nfsrv_getattr,
  124         nfsrv_setattr,
  125         nfsrv_lookup,
  126         nfsrv3_access,
  127         nfsrv_readlink,
  128         nfsrv_read,
  129         nfsrv_write,
  130         nfsrv_create,
  131         nfsrv_mkdir,
  132         nfsrv_symlink,
  133         nfsrv_mknod,
  134         nfsrv_remove,
  135         nfsrv_rmdir,
  136         nfsrv_rename,
  137         nfsrv_link,
  138         nfsrv_readdir,
  139         nfsrv_readdirplus,
  140         nfsrv_statfs,
  141         nfsrv_fsinfo,
  142         nfsrv_pathconf,
  143         nfsrv_commit,
  144         nfsrv_noop
  145 };
  146 
  147 /*
  148  * NFS server system calls
  149  */
  150 /*
  151  * This is now called from nfssvc() in nfs/nfs_nfssvc.c.
  152  */
  153 
  154 /*
  155  * Nfs server psuedo system call for the nfsd's
  156  * Based on the flag value it either:
  157  * - adds a socket to the selection list
  158  * - remains in the kernel as an nfsd
  159  * - remains in the kernel as an nfsiod
  160  * For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
  161  * and that mountd provides
  162  *  - sockaddr with no IPv4-mapped addresses
  163  *  - mask for both INET and INET6 families if there is IPv4-mapped overlap
  164  */
  165 int
  166 nfssvc_nfsserver(struct thread *td, struct nfssvc_args *uap)
  167 {
  168         struct file *fp;
  169         struct nfsd_addsock_args addsockarg;
  170         struct nfsd_nfsd_args nfsdarg;
  171         int error;
  172 
  173         if (uap->flag & NFSSVC_ADDSOCK) {
  174                 error = copyin(uap->argp, (caddr_t)&addsockarg,
  175                     sizeof(addsockarg));
  176                 if (error)
  177                         return (error);
  178                 if ((error = fget(td, addsockarg.sock, CAP_SOCK_ALL, &fp)) != 0)
  179                         return (error);
  180                 if (fp->f_type != DTYPE_SOCKET) {
  181                         fdrop(fp, td);
  182                         return (error); /* XXXRW: Should be EINVAL? */
  183                 }
  184                 error = nfssvc_addsock(fp, td);
  185                 fdrop(fp, td);
  186         } else if (uap->flag & NFSSVC_OLDNFSD)
  187                 error = nfssvc_nfsd(td, NULL);
  188         else if (uap->flag & NFSSVC_NFSD) {
  189                 if (!uap->argp)
  190                         return (EINVAL);
  191                 error = copyin(uap->argp, (caddr_t)&nfsdarg,
  192                     sizeof(nfsdarg));
  193                 if (error)
  194                         return (error);
  195                 error = nfssvc_nfsd(td, &nfsdarg);
  196         } else
  197                 error = ENXIO;
  198         return (error);
  199 }
  200 
  201 /*
  202  * Generate the rpc reply header
  203  * siz arg. is used to decide if adding a cluster is worthwhile
  204  */
  205 struct mbuf *
  206 nfs_rephead(int siz, struct nfsrv_descript *nd, int err,
  207     struct mbuf **mbp, caddr_t *bposp)
  208 {
  209         u_int32_t *tl;
  210         struct mbuf *mreq;
  211         caddr_t bpos;
  212         struct mbuf *mb;
  213 
  214         if (err == EBADRPC)
  215                 return (NULL);
  216 
  217         nd->nd_repstat = err;
  218         if (err && (nd->nd_flag & ND_NFSV3) == 0)       /* XXX recheck */
  219                 siz = 0;
  220 
  221         MGET(mreq, M_WAIT, MT_DATA);
  222 
  223         /*
  224          * If this is a big reply, use a cluster
  225          */
  226         mreq->m_len = 0;
  227         if (siz >= MINCLSIZE) {
  228                 MCLGET(mreq, M_WAIT);
  229         }
  230         mb = mreq;
  231         bpos = mtod(mb, caddr_t);
  232 
  233         if (err != NFSERR_RETVOID) {
  234                 tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
  235                 if (err)
  236                         *tl = txdr_unsigned(nfsrv_errmap(nd, err));
  237                 else
  238                         *tl = 0;
  239         }
  240 
  241         *mbp = mb;
  242         *bposp = bpos;
  243         if (err != 0 && err != NFSERR_RETVOID)
  244                 nfsrvstats.srvrpc_errs++;
  245 
  246         return (mreq);
  247 }
  248 
  249 static void
  250 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
  251 {
  252         rpcproc_t procnum;
  253         int32_t (*proc)(struct nfsrv_descript *nd, struct nfssvc_sock *slp,
  254             struct mbuf **mreqp);
  255         int flag;
  256         struct nfsrv_descript nd;
  257         struct mbuf *mreq, *mrep;
  258         int error;
  259 
  260         if (rqst->rq_vers == NFS_VER2) {
  261                 if (rqst->rq_proc > NFSV2PROC_STATFS) {
  262                         svcerr_noproc(rqst);
  263                         svc_freereq(rqst);
  264                         return;
  265                 }
  266                 procnum = nfsrv_nfsv3_procid[rqst->rq_proc];
  267                 flag = 0;
  268         } else {
  269                 if (rqst->rq_proc >= NFS_NPROCS) {
  270                         svcerr_noproc(rqst);
  271                         svc_freereq(rqst);
  272                         return;
  273                 }
  274                 procnum = rqst->rq_proc;
  275                 flag = ND_NFSV3;
  276         }
  277         proc = nfsrv3_procs[procnum];
  278 
  279         mreq = mrep = NULL;
  280         mreq = rqst->rq_args;
  281         rqst->rq_args = NULL;
  282         (void)nfs_realign(&mreq, M_WAIT);
  283 
  284         /*
  285          * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
  286          * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
  287          * mounts.
  288          */
  289         memset(&nd, 0, sizeof(nd));
  290         nd.nd_md = nd.nd_mrep = mreq;
  291         nd.nd_dpos = mtod(mreq, caddr_t);
  292         nd.nd_nam = svc_getrpccaller(rqst);
  293         nd.nd_nam2 = rqst->rq_addr;
  294         nd.nd_procnum = procnum;
  295         nd.nd_cr = NULL;
  296         nd.nd_flag = flag;
  297 
  298         if (nfs_privport) {
  299                 /* Check if source port is privileged */
  300                 u_short port;
  301                 struct sockaddr *nam = nd.nd_nam;
  302                 struct sockaddr_in *sin;
  303 
  304                 sin = (struct sockaddr_in *)nam;
  305                 /*
  306                  * INET/INET6 - same code:
  307                  *    sin_port and sin6_port are at same offset
  308                  */
  309                 port = ntohs(sin->sin_port);
  310                 if (port >= IPPORT_RESERVED &&
  311                     nd.nd_procnum != NFSPROC_NULL) {
  312 #ifdef INET6
  313                         char b6[INET6_ADDRSTRLEN];
  314 #if defined(KLD_MODULE)
  315                         /* Do not use ip6_sprintf: the nfs module should work without INET6. */
  316 #define ip6_sprintf(buf, a)                                             \
  317                         (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x",      \
  318                             (a)->s6_addr16[0], (a)->s6_addr16[1],       \
  319                             (a)->s6_addr16[2], (a)->s6_addr16[3],       \
  320                             (a)->s6_addr16[4], (a)->s6_addr16[5],       \
  321                             (a)->s6_addr16[6], (a)->s6_addr16[7]),      \
  322                             (buf))
  323 #endif
  324 #endif
  325                         printf("NFS request from unprivileged port (%s:%d)\n",
  326 #ifdef INET6
  327                             sin->sin_family == AF_INET6 ?
  328                             ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
  329 #if defined(KLD_MODULE)
  330 #undef ip6_sprintf
  331 #endif
  332 #endif
  333                             inet_ntoa(sin->sin_addr), port);
  334                         m_freem(mreq);
  335                         svcerr_weakauth(rqst);
  336                         svc_freereq(rqst);
  337                         return;
  338                 }
  339         }
  340 
  341         if (proc != nfsrv_null) {
  342                 if (!svc_getcred(rqst, &nd.nd_cr, &nd.nd_credflavor)) {
  343                         m_freem(mreq);
  344                         svcerr_weakauth(rqst);
  345                         svc_freereq(rqst);
  346                         return;
  347                 }
  348 #ifdef MAC
  349                 mac_cred_associate_nfsd(nd.nd_cr);
  350 #endif
  351         }
  352         nfsrvstats.srvrpccnt[nd.nd_procnum]++;
  353 
  354         error = proc(&nd, NULL, &mrep);
  355 
  356         if (nd.nd_cr)
  357                 crfree(nd.nd_cr);
  358 
  359         if (mrep == NULL) {
  360                 svcerr_decode(rqst);
  361                 svc_freereq(rqst);
  362                 return;
  363         }
  364         if (error && error != NFSERR_RETVOID) {
  365                 svcerr_systemerr(rqst);
  366                 svc_freereq(rqst);
  367                 return;
  368         }
  369         if (nd.nd_repstat & NFSERR_AUTHERR) {
  370                 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
  371                 m_freem(mrep);
  372         } else {
  373                 if (!svc_sendreply_mbuf(rqst, mrep))
  374                         svcerr_systemerr(rqst);
  375         }
  376         svc_freereq(rqst);
  377 }
  378 
  379 /*
  380  * Adds a socket to the list for servicing by nfsds.
  381  */
  382 static int
  383 nfssvc_addsock(struct file *fp, struct thread *td)
  384 {
  385         int siz;
  386         struct socket *so;
  387         int error;
  388         SVCXPRT *xprt;
  389 
  390         so = fp->f_data;
  391 
  392         siz = sb_max_adj;
  393         error = soreserve(so, siz, siz);
  394         if (error)
  395                 return (error);
  396 
  397         /*
  398          * Steal the socket from userland so that it doesn't close
  399          * unexpectedly.
  400          */
  401         if (so->so_type == SOCK_DGRAM)
  402                 xprt = svc_dg_create(nfsrv_pool, so, 0, 0);
  403         else
  404                 xprt = svc_vc_create(nfsrv_pool, so, 0, 0);
  405         if (xprt) {
  406                 fp->f_ops = &badfileops;
  407                 fp->f_data = NULL;
  408                 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, NULL);
  409                 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, NULL);
  410                 SVC_RELEASE(xprt);
  411         }
  412 
  413         return (0);
  414 }
  415 
  416 /*
  417  * Called by nfssvc() for nfsds.  Just loops around servicing rpc requests
  418  * until it is killed by a signal.
  419  */
  420 static int
  421 nfssvc_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
  422 {
  423         char principal[128];
  424         int error;
  425 
  426         if (args) {
  427                 error = copyinstr(args->principal, principal,
  428                     sizeof(principal), NULL);
  429                 if (error)
  430                         return (error);
  431         } else {
  432                 memcpy(principal, "nfs@", 4);
  433                 getcredhostname(td->td_ucred, principal + 4,
  434                     sizeof(principal) - 4);
  435         }
  436 
  437         /*
  438          * Only the first nfsd actually does any work.  The RPC code
  439          * adds threads to it as needed.  Any extra processes offered
  440          * by nfsd just exit.  If nfsd is new enough, it will call us
  441          * once with a structure that specifies how many threads to
  442          * use.
  443          */
  444         NFSD_LOCK();
  445         if (nfsrv_numnfsd == 0) {
  446                 nfsrv_numnfsd++;
  447 
  448                 NFSD_UNLOCK();
  449 
  450                 rpc_gss_set_svc_name_call(principal, "kerberosv5",
  451                     GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
  452                 rpc_gss_set_svc_name_call(principal, "kerberosv5",
  453                     GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
  454 
  455                 if (args) {
  456                         nfsrv_pool->sp_minthreads = args->minthreads;
  457                         nfsrv_pool->sp_maxthreads = args->maxthreads;
  458                 } else {
  459                         nfsrv_pool->sp_minthreads = 4;
  460                         nfsrv_pool->sp_maxthreads = 4;
  461                 }
  462 
  463                 svc_run(nfsrv_pool);
  464 
  465                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
  466                 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
  467 
  468                 NFSD_LOCK();
  469                 nfsrv_numnfsd--;
  470                 nfsrv_init(TRUE);
  471         }
  472         NFSD_UNLOCK();
  473 
  474         return (0);
  475 }
  476 
  477 /*
  478  * Size the NFS server's duplicate request cache at 1/2 the
  479  * nmbclusters, floating within a (64, 2048) range.  This is to
  480  * prevent all mbuf clusters being tied up in the NFS dupreq
  481  * cache for small values of nmbclusters.
  482  */
  483 static size_t
  484 nfsrv_replay_size(void)
  485 {
  486         size_t replaysiz;
  487 
  488         replaysiz = nmbclusters / 2;
  489         if (replaysiz > NFSRVCACHE_MAX_SIZE)
  490                 replaysiz = NFSRVCACHE_MAX_SIZE;
  491         if (replaysiz < NFSRVCACHE_MIN_SIZE)
  492                 replaysiz = NFSRVCACHE_MIN_SIZE;
  493         replaysiz *= MCLBYTES;
  494 
  495         return (replaysiz);
  496 }
  497 
  498 /*
  499  * Called when nmbclusters changes - we resize the replay cache
  500  * accordingly.
  501  */
  502 static void
  503 nfsrv_nmbclusters_change(void *tag)
  504 {
  505 
  506         if (nfsrv_pool)
  507                 replay_setsize(nfsrv_pool->sp_rcache, nfsrv_replay_size());
  508 }
  509 
  510 /*
  511  * Initialize the data structures for the server.
  512  * Handshake with any new nfsds starting up to avoid any chance of
  513  * corruption.
  514  */
  515 void
  516 nfsrv_init(int terminating)
  517 {
  518 
  519         NFSD_LOCK_ASSERT();
  520 
  521         if (terminating) {
  522                 NFSD_UNLOCK();
  523                 EVENTHANDLER_DEREGISTER(nmbclusters_change,
  524                     nfsrv_nmbclusters_tag);
  525                 svcpool_destroy(nfsrv_pool);
  526                 nfsrv_pool = NULL;
  527                 NFSD_LOCK();
  528         } else
  529                 nfs_pub.np_valid = 0;
  530 
  531         NFSD_UNLOCK();
  532 
  533         nfsrv_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsrv));
  534         nfsrv_pool->sp_rcache = replay_newcache(nfsrv_replay_size());
  535         nfsrv_pool->sp_assign = fhaold_assign;
  536         nfsrv_pool->sp_done = fha_nd_complete;
  537         nfsrv_nmbclusters_tag = EVENTHANDLER_REGISTER(nmbclusters_change,
  538             nfsrv_nmbclusters_change, NULL, EVENTHANDLER_PRI_FIRST);
  539 
  540         NFSD_LOCK();
  541 }
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FreeBSD/Linux Kernel Cross Reference sys/nfsserver/nfs_srvkrpc.c

FreeBSD/Linux Kernel Cross Reference
sys/nfsserver/nfs_srvkrpc.c
