2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software contributed to Berkeley by
6 * Rick Macklem at The University of Guelph.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
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.
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
34 #include <sys/cdefs.h>
35 __FBSDID("$FreeBSD$");
37 #include "opt_inet6.h"
38 #include "opt_kgssapi.h"
40 #include <fs/nfs/nfsport.h>
43 #include <rpc/rpcsec_gss.h>
45 #include <nfs/nfs_fha.h>
46 #include <fs/nfsserver/nfs_fha_new.h>
48 #include <security/mac/mac_framework.h>
52 struct nfsv4lock nfsd_suspend_lock;
55 * Mapping of old NFS Version 2 RPC numbers to generic numbers.
57 int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
83 SYSCTL_DECL(_vfs_nfsd);
87 static int nfs_privport = 0;
88 SYSCTL_INT(_vfs_nfsd, OID_AUTO, nfs_privport, CTLFLAG_RW,
90 "Only allow clients using a privileged port for NFSv2 and 3");
92 static int nfs_minvers = NFS_VER2;
93 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_min_nfsvers, CTLFLAG_RW,
94 &nfs_minvers, 0, "The lowest version of NFS handled by the server");
96 static int nfs_maxvers = NFS_VER4;
97 SYSCTL_INT(_vfs_nfsd, OID_AUTO, server_max_nfsvers, CTLFLAG_RW,
98 &nfs_maxvers, 0, "The highest version of NFS handled by the server");
100 static int nfs_proc(struct nfsrv_descript *, u_int32_t, SVCXPRT *xprt,
101 struct nfsrvcache **);
103 extern u_long sb_max_adj;
104 extern int newnfs_numnfsd;
105 extern struct proc *nfsd_master_proc;
108 * NFS server system calls
112 nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
114 struct nfsrv_descript nd;
115 struct nfsrvcache *rp = NULL;
116 int cacherep, credflavor;
118 memset(&nd, 0, sizeof(nd));
119 if (rqst->rq_vers == NFS_VER2) {
120 if (rqst->rq_proc > NFSV2PROC_STATFS) {
125 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
126 nd.nd_flag = ND_NFSV2;
127 } else if (rqst->rq_vers == NFS_VER3) {
128 if (rqst->rq_proc >= NFS_V3NPROCS) {
133 nd.nd_procnum = rqst->rq_proc;
134 nd.nd_flag = ND_NFSV3;
136 if (rqst->rq_proc != NFSPROC_NULL &&
137 rqst->rq_proc != NFSV4PROC_COMPOUND) {
142 nd.nd_procnum = rqst->rq_proc;
143 nd.nd_flag = ND_NFSV4;
147 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
148 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
151 nd.nd_mrep = rqst->rq_args;
152 rqst->rq_args = NULL;
153 newnfs_realign(&nd.nd_mrep, M_WAITOK);
154 nd.nd_md = nd.nd_mrep;
155 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
156 nd.nd_nam = svc_getrpccaller(rqst);
157 nd.nd_nam2 = rqst->rq_addr;
161 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
162 /* Check if source port is privileged */
164 struct sockaddr *nam = nd.nd_nam;
165 struct sockaddr_in *sin;
167 sin = (struct sockaddr_in *)nam;
169 * INET/INET6 - same code:
170 * sin_port and sin6_port are at same offset
172 port = ntohs(sin->sin_port);
173 if (port >= IPPORT_RESERVED &&
174 nd.nd_procnum != NFSPROC_NULL) {
176 char b6[INET6_ADDRSTRLEN];
177 #if defined(KLD_MODULE)
178 /* Do not use ip6_sprintf: the nfs module should work without INET6. */
179 #define ip6_sprintf(buf, a) \
180 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
181 (a)->s6_addr16[0], (a)->s6_addr16[1], \
182 (a)->s6_addr16[2], (a)->s6_addr16[3], \
183 (a)->s6_addr16[4], (a)->s6_addr16[5], \
184 (a)->s6_addr16[6], (a)->s6_addr16[7]), \
188 printf("NFS request from unprivileged port (%s:%d)\n",
190 sin->sin_family == AF_INET6 ?
191 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
192 #if defined(KLD_MODULE)
196 inet_ntoa(sin->sin_addr), port);
197 svcerr_weakauth(rqst);
204 if (nd.nd_procnum != NFSPROC_NULL) {
205 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
206 svcerr_weakauth(rqst);
212 /* Set the flag based on credflavor */
213 if (credflavor == RPCSEC_GSS_KRB5) {
214 nd.nd_flag |= ND_GSS;
215 } else if (credflavor == RPCSEC_GSS_KRB5I) {
216 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
217 } else if (credflavor == RPCSEC_GSS_KRB5P) {
218 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
219 } else if (credflavor != AUTH_SYS) {
220 svcerr_weakauth(rqst);
227 mac_cred_associate_nfsd(nd.nd_cred);
230 * Get a refcnt (shared lock) on nfsd_suspend_lock.
231 * NFSSVC_SUSPENDNFSD will take an exclusive lock on
232 * nfsd_suspend_lock to suspend these threads.
233 * This must be done here, before the check of
234 * nfsv4root exports by nfsvno_v4rootexport().
236 NFSLOCKV4ROOTMUTEX();
237 nfsv4_getref(&nfsd_suspend_lock, NULL, NFSV4ROOTLOCKMUTEXPTR,
239 NFSUNLOCKV4ROOTMUTEX();
241 if ((nd.nd_flag & ND_NFSV4) != 0) {
242 nd.nd_repstat = nfsvno_v4rootexport(&nd);
243 if (nd.nd_repstat != 0) {
244 NFSLOCKV4ROOTMUTEX();
245 nfsv4_relref(&nfsd_suspend_lock);
246 NFSUNLOCKV4ROOTMUTEX();
247 svcerr_weakauth(rqst);
254 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt, &rp);
255 NFSLOCKV4ROOTMUTEX();
256 nfsv4_relref(&nfsd_suspend_lock);
257 NFSUNLOCKV4ROOTMUTEX();
260 nd.nd_mreq->m_len = 0;
263 if (nd.nd_mrep != NULL)
266 if (nd.nd_cred != NULL)
269 if (cacherep == RC_DROPIT) {
270 if (nd.nd_mreq != NULL)
276 if (nd.nd_mreq == NULL) {
282 if (nd.nd_repstat & NFSERR_AUTHERR) {
283 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
284 if (nd.nd_mreq != NULL)
286 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
287 svcerr_systemerr(rqst);
290 nfsrvd_sentcache(rp, (rqst->rq_reply_seq != 0 ||
291 SVC_ACK(xprt, NULL)), rqst->rq_reply_seq);
300 * Check the cache and, optionally, do the RPC.
301 * Return the appropriate cache response.
304 nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, SVCXPRT *xprt,
305 struct nfsrvcache **rpp)
307 struct thread *td = curthread;
308 int cacherep = RC_DOIT, isdgram;
312 if (nd->nd_nam2 == NULL) {
313 nd->nd_flag |= ND_STREAMSOCK;
321 * 1 - For NFSv2 over UDP, if we are near our malloc/mget
322 * limit, just drop the request. There is no
323 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
324 * client will timeout/retry over UDP in a little while.
325 * 2 - nd_repstat == 0 && nd_mreq == NULL, which
326 * means a normal nfs rpc, so check the cache
328 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
329 nfsrv_mallocmget_limit()) {
330 cacherep = RC_DROPIT;
333 * For NFSv3, play it safe and assume that the client is
334 * doing retries on the same TCP connection.
336 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
338 nd->nd_flag |= ND_SAMETCPCONN;
340 nd->nd_tcpconntime = NFSD_MONOSEC;
341 nd->nd_sockref = xprt->xp_sockref;
342 cacherep = nfsrvd_getcache(nd);
345 nfsrc_trimcache(xprt->xp_sockref, ack, 0);
349 * Handle the request. There are three cases.
350 * RC_DOIT - do the RPC
351 * RC_REPLY - return the reply already created
352 * RC_DROPIT - just throw the request away
354 if (cacherep == RC_DOIT) {
355 nfsrvd_dorpc(nd, isdgram, td);
356 if (nd->nd_repstat == NFSERR_DONTREPLY)
357 cacherep = RC_DROPIT;
360 *rpp = nfsrvd_updatecache(nd);
368 nfssvc_loss(SVCXPRT *xprt)
374 nfsrc_trimcache(xprt->xp_sockref, ack, 1);
378 * Adds a socket to the list for servicing by nfsds.
381 nfsrvd_addsock(struct file *fp)
387 static u_int64_t sockref = 0;
392 error = soreserve(so, siz, siz);
397 * Steal the socket from userland so that it doesn't close
400 if (so->so_type == SOCK_DGRAM)
401 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
403 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
405 fp->f_ops = &badfileops;
407 xprt->xp_sockref = ++sockref;
408 if (nfs_minvers == NFS_VER2)
409 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
411 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
412 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
414 if (nfs_maxvers >= NFS_VER4)
415 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
417 if (so->so_type == SOCK_STREAM)
418 svc_loss_reg(xprt, nfssvc_loss);
428 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
429 * until it is killed by a signal.
432 nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
434 char principal[MAXHOSTNAMELEN + 5];
436 bool_t ret2, ret3, ret4;
438 error = copyinstr(args->principal, principal, sizeof (principal),
444 * Only the first nfsd actually does any work. The RPC code
445 * adds threads to it as needed. Any extra processes offered
446 * by nfsd just exit. If nfsd is new enough, it will call us
447 * once with a structure that specifies how many threads to
451 if (newnfs_numnfsd == 0) {
456 /* An empty string implies AUTH_SYS only. */
457 if (principal[0] != '\0') {
458 ret2 = rpc_gss_set_svc_name_call(principal,
459 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
460 ret3 = rpc_gss_set_svc_name_call(principal,
461 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
462 ret4 = rpc_gss_set_svc_name_call(principal,
463 "kerberosv5", GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
465 if (!ret2 || !ret3 || !ret4)
466 printf("nfsd: can't register svc name\n");
469 nfsrvd_pool->sp_minthreads = args->minthreads;
470 nfsrvd_pool->sp_maxthreads = args->maxthreads;
472 svc_run(nfsrvd_pool);
474 if (principal[0] != '\0') {
475 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER2);
476 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER3);
477 rpc_gss_clear_svc_name_call(NFS_PROG, NFS_VER4);
492 * Initialize the data structures for the server.
493 * Handshake with any new nfsds starting up to avoid any chance of
497 nfsrvd_init(int terminating)
503 nfsd_master_proc = NULL;
505 svcpool_destroy(nfsrvd_pool);
512 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsd));
513 nfsrvd_pool->sp_rcache = NULL;
514 nfsrvd_pool->sp_assign = fhanew_assign;
515 nfsrvd_pool->sp_done = fha_nd_complete;