45NFSDLOCKMUTEX;
46
47/*
48 * Mapping of old NFS Version 2 RPC numbers to generic numbers.
49 */
50static int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
51 NFSPROC_NULL,
52 NFSPROC_GETATTR,
53 NFSPROC_SETATTR,
54 NFSPROC_NOOP,
55 NFSPROC_LOOKUP,
56 NFSPROC_READLINK,
57 NFSPROC_READ,
58 NFSPROC_NOOP,
59 NFSPROC_WRITE,
60 NFSPROC_CREATE,
61 NFSPROC_REMOVE,
62 NFSPROC_RENAME,
63 NFSPROC_LINK,
64 NFSPROC_SYMLINK,
65 NFSPROC_MKDIR,
66 NFSPROC_RMDIR,
67 NFSPROC_READDIR,
68 NFSPROC_FSSTAT,
69 NFSPROC_NOOP,
70 NFSPROC_NOOP,
71 NFSPROC_NOOP,
72 NFSPROC_NOOP,
73};
74
75
76SYSCTL_DECL(_vfs_newnfs);
77
78SVCPOOL *nfsrvd_pool;
79
80static int nfs_privport = 0;
81SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_privport, CTLFLAG_RW,
82 &nfs_privport, 0,
83 "Only allow clients using a privileged port for NFSv2 and 3");
84
85static int nfs_minvers = NFS_VER2;
86SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_min_nfsvers, CTLFLAG_RW,
87 &nfs_minvers, 0, "The lowest version of NFS handled by the server");
88
89static int nfs_maxvers = NFS_VER4;
90SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_max_nfsvers, CTLFLAG_RW,
91 &nfs_maxvers, 0, "The highest version of NFS handled by the server");
92
93static int nfs_proc(struct nfsrv_descript *, u_int32_t, struct socket *,
94 u_int64_t, struct nfsrvcache **);
95
96extern u_long sb_max_adj;
97extern int newnfs_numnfsd;
98
99/*
100 * NFS server system calls
101 */
102
103static void
104nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
105{
106 struct nfsrv_descript nd;
107 struct nfsrvcache *rp = NULL;
108 int cacherep, credflavor;
109
110 memset(&nd, 0, sizeof(nd));
111 if (rqst->rq_vers == NFS_VER2) {
112 if (rqst->rq_proc > NFSV2PROC_STATFS) {
113 svcerr_noproc(rqst);
114 svc_freereq(rqst);
115 return;
116 }
117 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
118 nd.nd_flag = ND_NFSV2;
119 } else if (rqst->rq_vers == NFS_VER3) {
120 if (rqst->rq_proc >= NFS_V3NPROCS) {
121 svcerr_noproc(rqst);
122 svc_freereq(rqst);
123 return;
124 }
125 nd.nd_procnum = rqst->rq_proc;
126 nd.nd_flag = ND_NFSV3;
127 } else {
128 if (rqst->rq_proc != NFSPROC_NULL &&
129 rqst->rq_proc != NFSV4PROC_COMPOUND) {
130 svcerr_noproc(rqst);
131 svc_freereq(rqst);
132 return;
133 }
134 nd.nd_procnum = rqst->rq_proc;
135 nd.nd_flag = ND_NFSV4;
136 }
137
138 /*
139 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
140 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
141 * mounts.
142 */
143 nd.nd_mrep = rqst->rq_args;
144 rqst->rq_args = NULL;
145 newnfs_realign(&nd.nd_mrep);
146 nd.nd_md = nd.nd_mrep;
147 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
148 nd.nd_nam = svc_getrpccaller(rqst);
149 nd.nd_nam2 = rqst->rq_addr;
150 nd.nd_mreq = NULL;
151 nd.nd_cred = NULL;
152
153 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
154 /* Check if source port is privileged */
155 u_short port;
156 struct sockaddr *nam = nd.nd_nam;
157 struct sockaddr_in *sin;
158
159 sin = (struct sockaddr_in *)nam;
160 /*
161 * INET/INET6 - same code:
162 * sin_port and sin6_port are at same offset
163 */
164 port = ntohs(sin->sin_port);
165 if (port >= IPPORT_RESERVED &&
166 nd.nd_procnum != NFSPROC_NULL) {
167#ifdef INET6
168 char b6[INET6_ADDRSTRLEN];
169#if defined(KLD_MODULE)
170 /* Do not use ip6_sprintf: the nfs module should work without INET6. */
171#define ip6_sprintf(buf, a) \
172 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
173 (a)->s6_addr16[0], (a)->s6_addr16[1], \
174 (a)->s6_addr16[2], (a)->s6_addr16[3], \
175 (a)->s6_addr16[4], (a)->s6_addr16[5], \
176 (a)->s6_addr16[6], (a)->s6_addr16[7]), \
177 (buf))
178#endif
179#endif
180 printf("NFS request from unprivileged port (%s:%d)\n",
181#ifdef INET6
182 sin->sin_family == AF_INET6 ?
183 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
184#if defined(KLD_MODULE)
185#undef ip6_sprintf
186#endif
187#endif
188 inet_ntoa(sin->sin_addr), port);
189 svcerr_weakauth(rqst);
190 svc_freereq(rqst);
191 m_freem(nd.nd_mrep);
192 return;
193 }
194 }
195
196 if (nd.nd_procnum != NFSPROC_NULL) {
197 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
198 svcerr_weakauth(rqst);
199 svc_freereq(rqst);
200 m_freem(nd.nd_mrep);
201 return;
202 }
203
204 /* Set the flag based on credflavor */
205 if (credflavor == RPCSEC_GSS_KRB5) {
206 nd.nd_flag |= ND_GSS;
207 } else if (credflavor == RPCSEC_GSS_KRB5I) {
208 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
209 } else if (credflavor == RPCSEC_GSS_KRB5P) {
210 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
211 } else if (credflavor != AUTH_SYS) {
212 svcerr_weakauth(rqst);
213 svc_freereq(rqst);
214 m_freem(nd.nd_mrep);
215 return;
216 }
217
218#ifdef MAC
219 mac_cred_associate_nfsd(nd.nd_cred);
220#endif
221 if ((nd.nd_flag & ND_NFSV4) != 0) {
222 nd.nd_repstat = nfsvno_v4rootexport(&nd);
223 if (nd.nd_repstat != 0) {
224 svcerr_weakauth(rqst);
225 svc_freereq(rqst);
226 m_freem(nd.nd_mrep);
227 return;
228 }
229 }
230
231 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt->xp_socket,
232 xprt->xp_sockref, &rp);
233 } else {
234 NFSMGET(nd.nd_mreq);
235 nd.nd_mreq->m_len = 0;
236 cacherep = RC_REPLY;
237 }
238 if (nd.nd_mrep != NULL)
239 m_freem(nd.nd_mrep);
240
241 if (nd.nd_cred != NULL)
242 crfree(nd.nd_cred);
243
244 if (cacherep == RC_DROPIT) {
245 if (nd.nd_mreq != NULL)
246 m_freem(nd.nd_mreq);
247 svc_freereq(rqst);
248 return;
249 }
250
251 if (nd.nd_mreq == NULL) {
252 svcerr_decode(rqst);
253 svc_freereq(rqst);
254 return;
255 }
256
257 if (nd.nd_repstat & NFSERR_AUTHERR) {
258 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
259 if (nd.nd_mreq != NULL)
260 m_freem(nd.nd_mreq);
261 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
262 svcerr_systemerr(rqst);
263 }
264 if (rp != NULL)
265 nfsrvd_sentcache(rp, xprt->xp_socket, 0);
266 svc_freereq(rqst);
267}
268
269/*
270 * Check the cache and, optionally, do the RPC.
271 * Return the appropriate cache response.
272 */
273static int
274nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, struct socket *so,
275 u_int64_t sockref, struct nfsrvcache **rpp)
276{
277 struct thread *td = curthread;
278 int cacherep = RC_DOIT, isdgram;
279
280 *rpp = NULL;
281 if (nd->nd_nam2 == NULL) {
282 nd->nd_flag |= ND_STREAMSOCK;
283 isdgram = 0;
284 } else {
285 isdgram = 1;
286 }
287 NFSGETTIME(&nd->nd_starttime);
288
289 /*
290 * Two cases:
291 * 1 - For NFSv2 over UDP, if we are near our malloc/mget
292 * limit, just drop the request. There is no
293 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
294 * client will timeout/retry over UDP in a little while.
295 * 2 - nd_repstat == 0 && nd_mreq == NULL, which
296 * means a normal nfs rpc, so check the cache
297 */
298 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
299 nfsrv_mallocmget_limit()) {
300 cacherep = RC_DROPIT;
301 } else {
302 /*
303 * For NFSv3, play it safe and assume that the client is
304 * doing retries on the same TCP connection.
305 */
306 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
307 ND_STREAMSOCK)
308 nd->nd_flag |= ND_SAMETCPCONN;
309 nd->nd_retxid = xid;
310 nd->nd_tcpconntime = NFSD_MONOSEC;
311 nd->nd_sockref = sockref;
312 cacherep = nfsrvd_getcache(nd, so);
313 }
314
315 /*
316 * Handle the request. There are three cases.
317 * RC_DOIT - do the RPC
318 * RC_REPLY - return the reply already created
319 * RC_DROPIT - just throw the request away
320 */
321 if (cacherep == RC_DOIT) {
322 nfsrvd_dorpc(nd, isdgram, td);
323 if (nd->nd_repstat == NFSERR_DONTREPLY)
324 cacherep = RC_DROPIT;
325 else
326 cacherep = RC_REPLY;
327 *rpp = nfsrvd_updatecache(nd, so);
328 }
329 return (cacherep);
330}
331
332/*
333 * Adds a socket to the list for servicing by nfsds.
334 */
335int
336nfsrvd_addsock(struct file *fp)
337{
338 int siz;
339 struct socket *so;
340 int error;
341 SVCXPRT *xprt;
342 static u_int64_t sockref = 0;
343
344 so = fp->f_data;
345
346 siz = sb_max_adj;
347 error = soreserve(so, siz, siz);
348 if (error) {
349 return (error);
350 }
351
352 /*
353 * Steal the socket from userland so that it doesn't close
354 * unexpectedly.
355 */
356 if (so->so_type == SOCK_DGRAM)
357 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
358 else
359 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
360 if (xprt) {
361 fp->f_ops = &badfileops;
362 fp->f_data = NULL;
363 xprt->xp_sockref = ++sockref;
364 if (nfs_minvers == NFS_VER2)
365 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
366 NULL);
367 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
368 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
369 NULL);
370 if (nfs_maxvers >= NFS_VER4)
371 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
372 NULL);
373 }
374
375 return (0);
376}
377
378/*
379 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
380 * until it is killed by a signal.
381 */
382int
383nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
384{
385#ifdef KGSSAPI
386 char principal[MAXHOSTNAMELEN + 5];
387 int error;
388 bool_t ret2, ret3, ret4;
389#endif
390
391#ifdef KGSSAPI
392 error = copyinstr(args->principal, principal, sizeof (principal),
393 NULL);
394 if (error)
395 return (error);
396#endif
397
398 /*
399 * Only the first nfsd actually does any work. The RPC code
400 * adds threads to it as needed. Any extra processes offered
401 * by nfsd just exit. If nfsd is new enough, it will call us
402 * once with a structure that specifies how many threads to
403 * use.
404 */
405 NFSD_LOCK();
406 if (newnfs_numnfsd == 0) {
407 newnfs_numnfsd++;
408
409 NFSD_UNLOCK();
410
411#ifdef KGSSAPI
412 /* An empty string implies AUTH_SYS only. */
413 if (principal[0] != '\0') {
414 ret2 = rpc_gss_set_svc_name(principal, "kerberosv5",
415 GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
416 ret3 = rpc_gss_set_svc_name(principal, "kerberosv5",
417 GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
418 ret4 = rpc_gss_set_svc_name(principal, "kerberosv5",
419 GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
420
421 if (!ret2 || !ret3 || !ret4) {
422 NFSD_LOCK();
423 newnfs_numnfsd--;
424 nfsrvd_init(1);
425 NFSD_UNLOCK();
426 return (EAUTH);
427 }
428 }
429#endif
430
431 nfsrvd_pool->sp_minthreads = args->minthreads;
432 nfsrvd_pool->sp_maxthreads = args->maxthreads;
433
434 svc_run(nfsrvd_pool);
435
436#ifdef KGSSAPI
437 if (principal[0] != '\0') {
438 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER2);
439 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER3);
440 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER4);
441 }
442#endif
443
444 NFSD_LOCK();
445 newnfs_numnfsd--;
446 nfsrvd_init(1);
447 }
448 NFSD_UNLOCK();
449
450 return (0);
451}
452
453/*
454 * Initialize the data structures for the server.
455 * Handshake with any new nfsds starting up to avoid any chance of
456 * corruption.
457 */
458void
459nfsrvd_init(int terminating)
460{
461
462 NFSD_LOCK_ASSERT();
463
464 if (terminating) {
465 NFSD_UNLOCK();
466 svcpool_destroy(nfsrvd_pool);
467 nfsrvd_pool = NULL;
468 NFSD_LOCK();
469 }
470
471 NFSD_UNLOCK();
472
473 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_newnfs));
474 nfsrvd_pool->sp_rcache = NULL;
475 nfsrvd_pool->sp_assign = NULL;
476 nfsrvd_pool->sp_done = NULL;
477
478 NFSD_LOCK();
479}
480
| 47NFSDLOCKMUTEX;
48
49/*
50 * Mapping of old NFS Version 2 RPC numbers to generic numbers.
51 */
52static int newnfs_nfsv3_procid[NFS_V3NPROCS] = {
53 NFSPROC_NULL,
54 NFSPROC_GETATTR,
55 NFSPROC_SETATTR,
56 NFSPROC_NOOP,
57 NFSPROC_LOOKUP,
58 NFSPROC_READLINK,
59 NFSPROC_READ,
60 NFSPROC_NOOP,
61 NFSPROC_WRITE,
62 NFSPROC_CREATE,
63 NFSPROC_REMOVE,
64 NFSPROC_RENAME,
65 NFSPROC_LINK,
66 NFSPROC_SYMLINK,
67 NFSPROC_MKDIR,
68 NFSPROC_RMDIR,
69 NFSPROC_READDIR,
70 NFSPROC_FSSTAT,
71 NFSPROC_NOOP,
72 NFSPROC_NOOP,
73 NFSPROC_NOOP,
74 NFSPROC_NOOP,
75};
76
77
78SYSCTL_DECL(_vfs_newnfs);
79
80SVCPOOL *nfsrvd_pool;
81
82static int nfs_privport = 0;
83SYSCTL_INT(_vfs_newnfs, OID_AUTO, nfs_privport, CTLFLAG_RW,
84 &nfs_privport, 0,
85 "Only allow clients using a privileged port for NFSv2 and 3");
86
87static int nfs_minvers = NFS_VER2;
88SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_min_nfsvers, CTLFLAG_RW,
89 &nfs_minvers, 0, "The lowest version of NFS handled by the server");
90
91static int nfs_maxvers = NFS_VER4;
92SYSCTL_INT(_vfs_newnfs, OID_AUTO, server_max_nfsvers, CTLFLAG_RW,
93 &nfs_maxvers, 0, "The highest version of NFS handled by the server");
94
95static int nfs_proc(struct nfsrv_descript *, u_int32_t, struct socket *,
96 u_int64_t, struct nfsrvcache **);
97
98extern u_long sb_max_adj;
99extern int newnfs_numnfsd;
100
101/*
102 * NFS server system calls
103 */
104
105static void
106nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
107{
108 struct nfsrv_descript nd;
109 struct nfsrvcache *rp = NULL;
110 int cacherep, credflavor;
111
112 memset(&nd, 0, sizeof(nd));
113 if (rqst->rq_vers == NFS_VER2) {
114 if (rqst->rq_proc > NFSV2PROC_STATFS) {
115 svcerr_noproc(rqst);
116 svc_freereq(rqst);
117 return;
118 }
119 nd.nd_procnum = newnfs_nfsv3_procid[rqst->rq_proc];
120 nd.nd_flag = ND_NFSV2;
121 } else if (rqst->rq_vers == NFS_VER3) {
122 if (rqst->rq_proc >= NFS_V3NPROCS) {
123 svcerr_noproc(rqst);
124 svc_freereq(rqst);
125 return;
126 }
127 nd.nd_procnum = rqst->rq_proc;
128 nd.nd_flag = ND_NFSV3;
129 } else {
130 if (rqst->rq_proc != NFSPROC_NULL &&
131 rqst->rq_proc != NFSV4PROC_COMPOUND) {
132 svcerr_noproc(rqst);
133 svc_freereq(rqst);
134 return;
135 }
136 nd.nd_procnum = rqst->rq_proc;
137 nd.nd_flag = ND_NFSV4;
138 }
139
140 /*
141 * Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
142 * NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
143 * mounts.
144 */
145 nd.nd_mrep = rqst->rq_args;
146 rqst->rq_args = NULL;
147 newnfs_realign(&nd.nd_mrep);
148 nd.nd_md = nd.nd_mrep;
149 nd.nd_dpos = mtod(nd.nd_md, caddr_t);
150 nd.nd_nam = svc_getrpccaller(rqst);
151 nd.nd_nam2 = rqst->rq_addr;
152 nd.nd_mreq = NULL;
153 nd.nd_cred = NULL;
154
155 if (nfs_privport && (nd.nd_flag & ND_NFSV4) == 0) {
156 /* Check if source port is privileged */
157 u_short port;
158 struct sockaddr *nam = nd.nd_nam;
159 struct sockaddr_in *sin;
160
161 sin = (struct sockaddr_in *)nam;
162 /*
163 * INET/INET6 - same code:
164 * sin_port and sin6_port are at same offset
165 */
166 port = ntohs(sin->sin_port);
167 if (port >= IPPORT_RESERVED &&
168 nd.nd_procnum != NFSPROC_NULL) {
169#ifdef INET6
170 char b6[INET6_ADDRSTRLEN];
171#if defined(KLD_MODULE)
172 /* Do not use ip6_sprintf: the nfs module should work without INET6. */
173#define ip6_sprintf(buf, a) \
174 (sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
175 (a)->s6_addr16[0], (a)->s6_addr16[1], \
176 (a)->s6_addr16[2], (a)->s6_addr16[3], \
177 (a)->s6_addr16[4], (a)->s6_addr16[5], \
178 (a)->s6_addr16[6], (a)->s6_addr16[7]), \
179 (buf))
180#endif
181#endif
182 printf("NFS request from unprivileged port (%s:%d)\n",
183#ifdef INET6
184 sin->sin_family == AF_INET6 ?
185 ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
186#if defined(KLD_MODULE)
187#undef ip6_sprintf
188#endif
189#endif
190 inet_ntoa(sin->sin_addr), port);
191 svcerr_weakauth(rqst);
192 svc_freereq(rqst);
193 m_freem(nd.nd_mrep);
194 return;
195 }
196 }
197
198 if (nd.nd_procnum != NFSPROC_NULL) {
199 if (!svc_getcred(rqst, &nd.nd_cred, &credflavor)) {
200 svcerr_weakauth(rqst);
201 svc_freereq(rqst);
202 m_freem(nd.nd_mrep);
203 return;
204 }
205
206 /* Set the flag based on credflavor */
207 if (credflavor == RPCSEC_GSS_KRB5) {
208 nd.nd_flag |= ND_GSS;
209 } else if (credflavor == RPCSEC_GSS_KRB5I) {
210 nd.nd_flag |= (ND_GSS | ND_GSSINTEGRITY);
211 } else if (credflavor == RPCSEC_GSS_KRB5P) {
212 nd.nd_flag |= (ND_GSS | ND_GSSPRIVACY);
213 } else if (credflavor != AUTH_SYS) {
214 svcerr_weakauth(rqst);
215 svc_freereq(rqst);
216 m_freem(nd.nd_mrep);
217 return;
218 }
219
220#ifdef MAC
221 mac_cred_associate_nfsd(nd.nd_cred);
222#endif
223 if ((nd.nd_flag & ND_NFSV4) != 0) {
224 nd.nd_repstat = nfsvno_v4rootexport(&nd);
225 if (nd.nd_repstat != 0) {
226 svcerr_weakauth(rqst);
227 svc_freereq(rqst);
228 m_freem(nd.nd_mrep);
229 return;
230 }
231 }
232
233 cacherep = nfs_proc(&nd, rqst->rq_xid, xprt->xp_socket,
234 xprt->xp_sockref, &rp);
235 } else {
236 NFSMGET(nd.nd_mreq);
237 nd.nd_mreq->m_len = 0;
238 cacherep = RC_REPLY;
239 }
240 if (nd.nd_mrep != NULL)
241 m_freem(nd.nd_mrep);
242
243 if (nd.nd_cred != NULL)
244 crfree(nd.nd_cred);
245
246 if (cacherep == RC_DROPIT) {
247 if (nd.nd_mreq != NULL)
248 m_freem(nd.nd_mreq);
249 svc_freereq(rqst);
250 return;
251 }
252
253 if (nd.nd_mreq == NULL) {
254 svcerr_decode(rqst);
255 svc_freereq(rqst);
256 return;
257 }
258
259 if (nd.nd_repstat & NFSERR_AUTHERR) {
260 svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
261 if (nd.nd_mreq != NULL)
262 m_freem(nd.nd_mreq);
263 } else if (!svc_sendreply_mbuf(rqst, nd.nd_mreq)) {
264 svcerr_systemerr(rqst);
265 }
266 if (rp != NULL)
267 nfsrvd_sentcache(rp, xprt->xp_socket, 0);
268 svc_freereq(rqst);
269}
270
271/*
272 * Check the cache and, optionally, do the RPC.
273 * Return the appropriate cache response.
274 */
275static int
276nfs_proc(struct nfsrv_descript *nd, u_int32_t xid, struct socket *so,
277 u_int64_t sockref, struct nfsrvcache **rpp)
278{
279 struct thread *td = curthread;
280 int cacherep = RC_DOIT, isdgram;
281
282 *rpp = NULL;
283 if (nd->nd_nam2 == NULL) {
284 nd->nd_flag |= ND_STREAMSOCK;
285 isdgram = 0;
286 } else {
287 isdgram = 1;
288 }
289 NFSGETTIME(&nd->nd_starttime);
290
291 /*
292 * Two cases:
293 * 1 - For NFSv2 over UDP, if we are near our malloc/mget
294 * limit, just drop the request. There is no
295 * NFSERR_RESOURCE or NFSERR_DELAY for NFSv2 and the
296 * client will timeout/retry over UDP in a little while.
297 * 2 - nd_repstat == 0 && nd_mreq == NULL, which
298 * means a normal nfs rpc, so check the cache
299 */
300 if ((nd->nd_flag & ND_NFSV2) && nd->nd_nam2 != NULL &&
301 nfsrv_mallocmget_limit()) {
302 cacherep = RC_DROPIT;
303 } else {
304 /*
305 * For NFSv3, play it safe and assume that the client is
306 * doing retries on the same TCP connection.
307 */
308 if ((nd->nd_flag & (ND_NFSV4 | ND_STREAMSOCK)) ==
309 ND_STREAMSOCK)
310 nd->nd_flag |= ND_SAMETCPCONN;
311 nd->nd_retxid = xid;
312 nd->nd_tcpconntime = NFSD_MONOSEC;
313 nd->nd_sockref = sockref;
314 cacherep = nfsrvd_getcache(nd, so);
315 }
316
317 /*
318 * Handle the request. There are three cases.
319 * RC_DOIT - do the RPC
320 * RC_REPLY - return the reply already created
321 * RC_DROPIT - just throw the request away
322 */
323 if (cacherep == RC_DOIT) {
324 nfsrvd_dorpc(nd, isdgram, td);
325 if (nd->nd_repstat == NFSERR_DONTREPLY)
326 cacherep = RC_DROPIT;
327 else
328 cacherep = RC_REPLY;
329 *rpp = nfsrvd_updatecache(nd, so);
330 }
331 return (cacherep);
332}
333
334/*
335 * Adds a socket to the list for servicing by nfsds.
336 */
337int
338nfsrvd_addsock(struct file *fp)
339{
340 int siz;
341 struct socket *so;
342 int error;
343 SVCXPRT *xprt;
344 static u_int64_t sockref = 0;
345
346 so = fp->f_data;
347
348 siz = sb_max_adj;
349 error = soreserve(so, siz, siz);
350 if (error) {
351 return (error);
352 }
353
354 /*
355 * Steal the socket from userland so that it doesn't close
356 * unexpectedly.
357 */
358 if (so->so_type == SOCK_DGRAM)
359 xprt = svc_dg_create(nfsrvd_pool, so, 0, 0);
360 else
361 xprt = svc_vc_create(nfsrvd_pool, so, 0, 0);
362 if (xprt) {
363 fp->f_ops = &badfileops;
364 fp->f_data = NULL;
365 xprt->xp_sockref = ++sockref;
366 if (nfs_minvers == NFS_VER2)
367 svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program,
368 NULL);
369 if (nfs_minvers <= NFS_VER3 && nfs_maxvers >= NFS_VER3)
370 svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program,
371 NULL);
372 if (nfs_maxvers >= NFS_VER4)
373 svc_reg(xprt, NFS_PROG, NFS_VER4, nfssvc_program,
374 NULL);
375 }
376
377 return (0);
378}
379
380/*
381 * Called by nfssvc() for nfsds. Just loops around servicing rpc requests
382 * until it is killed by a signal.
383 */
384int
385nfsrvd_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
386{
387#ifdef KGSSAPI
388 char principal[MAXHOSTNAMELEN + 5];
389 int error;
390 bool_t ret2, ret3, ret4;
391#endif
392
393#ifdef KGSSAPI
394 error = copyinstr(args->principal, principal, sizeof (principal),
395 NULL);
396 if (error)
397 return (error);
398#endif
399
400 /*
401 * Only the first nfsd actually does any work. The RPC code
402 * adds threads to it as needed. Any extra processes offered
403 * by nfsd just exit. If nfsd is new enough, it will call us
404 * once with a structure that specifies how many threads to
405 * use.
406 */
407 NFSD_LOCK();
408 if (newnfs_numnfsd == 0) {
409 newnfs_numnfsd++;
410
411 NFSD_UNLOCK();
412
413#ifdef KGSSAPI
414 /* An empty string implies AUTH_SYS only. */
415 if (principal[0] != '\0') {
416 ret2 = rpc_gss_set_svc_name(principal, "kerberosv5",
417 GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
418 ret3 = rpc_gss_set_svc_name(principal, "kerberosv5",
419 GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
420 ret4 = rpc_gss_set_svc_name(principal, "kerberosv5",
421 GSS_C_INDEFINITE, NFS_PROG, NFS_VER4);
422
423 if (!ret2 || !ret3 || !ret4) {
424 NFSD_LOCK();
425 newnfs_numnfsd--;
426 nfsrvd_init(1);
427 NFSD_UNLOCK();
428 return (EAUTH);
429 }
430 }
431#endif
432
433 nfsrvd_pool->sp_minthreads = args->minthreads;
434 nfsrvd_pool->sp_maxthreads = args->maxthreads;
435
436 svc_run(nfsrvd_pool);
437
438#ifdef KGSSAPI
439 if (principal[0] != '\0') {
440 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER2);
441 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER3);
442 rpc_gss_clear_svc_name(NFS_PROG, NFS_VER4);
443 }
444#endif
445
446 NFSD_LOCK();
447 newnfs_numnfsd--;
448 nfsrvd_init(1);
449 }
450 NFSD_UNLOCK();
451
452 return (0);
453}
454
455/*
456 * Initialize the data structures for the server.
457 * Handshake with any new nfsds starting up to avoid any chance of
458 * corruption.
459 */
460void
461nfsrvd_init(int terminating)
462{
463
464 NFSD_LOCK_ASSERT();
465
466 if (terminating) {
467 NFSD_UNLOCK();
468 svcpool_destroy(nfsrvd_pool);
469 nfsrvd_pool = NULL;
470 NFSD_LOCK();
471 }
472
473 NFSD_UNLOCK();
474
475 nfsrvd_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_newnfs));
476 nfsrvd_pool->sp_rcache = NULL;
477 nfsrvd_pool->sp_assign = NULL;
478 nfsrvd_pool->sp_done = NULL;
479
480 NFSD_LOCK();
481}
482
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