source: rtems-libbsd/freebsd/sys/fs/nfsclient/nfs_clkrpc.c @ 6e4709b

6-freebsd-12
Last change on this file since 6e4709b was 6e4709b, checked in by Sebastian Huber <sebastian.huber@…>, on 01/05/23 at 16:42:48

vfs/nfs: Revert white space changes

  • Property mode set to 100644
File size: 7.4 KB
Line 
1#include <machine/rtems-bsd-kernel-space.h>
2
3/*-
4 * SPDX-License-Identifier: BSD-3-Clause
5 *
6 * Copyright (c) 1989, 1993
7 *      The Regents of the University of California.  All rights reserved.
8 *
9 * This code is derived from software contributed to Berkeley by
10 * Rick Macklem at The University of Guelph.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 */
37
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41#include <rtems/bsd/local/opt_kgssapi.h>
42
43#include <fs/nfs/nfsport.h>
44
45#include <rpc/rpc.h>
46#include <rpc/rpcsec_gss.h>
47#include <rpc/replay.h>
48
49
50NFSDLOCKMUTEX;
51
52extern SVCPOOL  *nfscbd_pool;
53
54static int nfs_cbproc(struct nfsrv_descript *, u_int32_t);
55
56extern u_long sb_max_adj;
57extern int nfs_numnfscbd;
58extern int nfscl_debuglevel;
59
60/*
61 * NFS client system calls for handling callbacks.
62 */
63
64/*
65 * Handles server to client callbacks.
66 */
67static void
68nfscb_program(struct svc_req *rqst, SVCXPRT *xprt)
69{
70        struct nfsrv_descript nd;
71        int cacherep, credflavor;
72
73        memset(&nd, 0, sizeof(nd));
74        if (rqst->rq_proc != NFSPROC_NULL &&
75            rqst->rq_proc != NFSV4PROC_CBCOMPOUND) {
76                svcerr_noproc(rqst);
77                svc_freereq(rqst);
78                return;
79        }
80        nd.nd_procnum = rqst->rq_proc;
81        nd.nd_flag = (ND_NFSCB | ND_NFSV4);
82
83        /*
84         * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
85         * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
86         * mounts.
87         */
88        nd.nd_mrep = rqst->rq_args;
89        rqst->rq_args = NULL;
90        newnfs_realign(&nd.nd_mrep, M_WAITOK);
91        nd.nd_md = nd.nd_mrep;
92        nd.nd_dpos = mtod(nd.nd_md, caddr_t);
93        nd.nd_nam = svc_getrpccaller(rqst);
94        nd.nd_nam2 = rqst->rq_addr;
95        nd.nd_mreq = NULL;
96        nd.nd_cred = NULL;
97
98        NFSCL_DEBUG(1, "cbproc=%d\n",nd.nd_procnum);
99        if (nd.nd_procnum != NFSPROC_NULL) {
100                if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
101                        svcerr_weakauth(rqst);
102                        svc_freereq(rqst);
103                        m_freem(nd.nd_mrep);
104                        return;
105                }
106
107                /* For now, I don't care what credential flavor was used. */
108#ifdef notyet
109#ifdef MAC
110                mac_cred_associate_nfsd(nd.nd_cred);
111#endif
112#endif
113                cacherep = nfs_cbproc(&nd, rqst->rq_xid);
114        } else {
115                NFSMGET(nd.nd_mreq);
116                nd.nd_mreq->m_len = 0;
117                cacherep = RC_REPLY;
118        }
119        if (nd.nd_mrep != NULL)
120                m_freem(nd.nd_mrep);
121
122        if (nd.nd_cred != NULL)
123                crfree(nd.nd_cred);
124
125        if (cacherep == RC_DROPIT) {
126                if (nd.nd_mreq != NULL)
127                        m_freem(nd.nd_mreq);
128                svc_freereq(rqst);
129                return;
130        }
131
132        if (nd.nd_mreq == NULL) {
133                svcerr_decode(rqst);
134                svc_freereq(rqst);
135                return;
136        }
137
138        if (nd.nd_repstat & NFSERR_AUTHERR) {
139                svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
140                if (nd.nd_mreq != NULL)
141                        m_freem(nd.nd_mreq);
142        } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq))
143                svcerr_systemerr(rqst);
144        else
145                NFSCL_DEBUG(1, "cbrep sent\n");
146        svc_freereq(rqst);
147}
148
149/*
150 * Check the cache and, optionally, do the RPC.
151 * Return the appropriate cache response.
152 */
153static int
154nfs_cbproc(struct nfsrv_descript *nd, u_int32_t xid)
155{
156        struct thread *td = curthread;
157        int cacherep;
158
159        if (nd->nd_nam2 == NULL)
160                nd->nd_flag |= ND_STREAMSOCK;
161
162        nfscl_docb(nd, td);
163        if (nd->nd_repstat == NFSERR_DONTREPLY)
164                cacherep = RC_DROPIT;
165        else
166                cacherep = RC_REPLY;
167        return (cacherep);
168}
169
170/*
171 * Adds a socket to the list for servicing by nfscbds.
172 */
173int
174nfscbd_addsock(struct file *fp)
175{
176        int siz;
177        struct socket *so;
178        int error;
179        SVCXPRT *xprt;
180
181        so = fp->f_data;
182
183        siz = sb_max_adj;
184        error = soreserve(so, siz, siz);
185        if (error)
186                return (error);
187
188        /*
189         * Steal the socket from userland so that it doesn't close
190         * unexpectedly.
191         */
192        if (so->so_type == SOCK_DGRAM)
193                xprt = svc_dg_create(nfscbd_pool, so, 0, 0);
194        else
195                xprt = svc_vc_create(nfscbd_pool, so, 0, 0);
196        if (xprt) {
197                fp->f_ops = &badfileops;
198                fp->f_data = NULL;
199                svc_reg(xprt, NFS_CALLBCKPROG, NFSV4_CBVERS, nfscb_program,
200                    NULL);
201                SVC_RELEASE(xprt);
202        }
203
204        return (0);
205}
206
207/*
208 * Called by nfssvc() for nfscbds. Just loops around servicing rpc requests
209 * until it is killed by a signal.
210 *
211 * For now, only support callbacks via RPCSEC_GSS if there is a KerberosV
212 * keytab entry with a host based entry in it on the client. (I'm not even
213 * sure that getting Acceptor credentials for a user principal with a
214 * credentials cache is possible, but even if it is, major changes to the
215 * kgssapi would be required.)
216 * I don't believe that this is a serious limitation since, as of 2009, most
217 * NFSv4 servers supporting callbacks are using AUTH_SYS for callbacks even
218 * when the client is using RPCSEC_GSS. (This BSD server uses AUTH_SYS
219 * for callbacks unless nfsrv_gsscallbackson is set non-zero.)
220 */
221int
222nfscbd_nfsd(struct thread *td, struct nfsd_nfscbd_args *args)
223{
224        char principal[128];
225        int error;
226
227        if (args != NULL) {
228                error = copyinstr(args->principal, principal,
229                    sizeof(principal), NULL);
230                if (error)
231                        return (error);
232        } else {
233                principal[0] = '\0';
234        }
235
236        /*
237         * Only the first nfsd actually does any work. The RPC code
238         * adds threads to it as needed. Any extra processes offered
239         * by nfsd just exit. If nfsd is new enough, it will call us
240         * once with a structure that specifies how many threads to
241         * use.
242         */
243        NFSD_LOCK();
244        if (nfs_numnfscbd == 0) {
245                nfs_numnfscbd++;
246
247                NFSD_UNLOCK();
248
249                if (principal[0] != '\0')
250                        rpc_gss_set_svc_name_call(principal, "kerberosv5",
251                            GSS_C_INDEFINITE, NFS_CALLBCKPROG, NFSV4_CBVERS);
252
253                nfscbd_pool->sp_minthreads = 4;
254                nfscbd_pool->sp_maxthreads = 4;
255                       
256                svc_run(nfscbd_pool);
257
258                rpc_gss_clear_svc_name_call(NFS_CALLBCKPROG, NFSV4_CBVERS);
259
260                NFSD_LOCK();
261                nfs_numnfscbd--;
262                nfsrvd_cbinit(1);
263        }
264        NFSD_UNLOCK();
265
266        return (0);
267}
268
269/*
270 * Initialize the data structures for the server.
271 * Handshake with any new nfsds starting up to avoid any chance of
272 * corruption.
273 */
274void
275nfsrvd_cbinit(int terminating)
276{
277
278        NFSD_LOCK_ASSERT();
279
280        if (terminating) {
281                /* Wait for any xprt registrations to complete. */
282                while (nfs_numnfscbd > 0)
283                        msleep(&nfs_numnfscbd, NFSDLOCKMUTEXPTR, PZERO,
284                            "nfscbdt", 0);
285                if (nfscbd_pool != NULL) {
286                        NFSD_UNLOCK();
287                        svcpool_close(nfscbd_pool);
288                        NFSD_LOCK();
289                }
290        }
291
292        if (nfscbd_pool == NULL) {
293                NFSD_UNLOCK();
294                nfscbd_pool = svcpool_create("nfscbd", NULL);
295                nfscbd_pool->sp_rcache = NULL;
296                nfscbd_pool->sp_assign = NULL;
297                nfscbd_pool->sp_done = NULL;
298                NFSD_LOCK();
299        }
300}
301
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