1 /* $NetBSD: nfs_srvsocket.c,v 1.6 2024/07/05 04:31:54 rin Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1991, 1993, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Rick Macklem at The University of Guelph. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)nfs_socket.c 8.5 (Berkeley) 3/30/95 35 */ 36 37 /* 38 * Socket operations for use by nfs 39 */ 40 41 #include <sys/cdefs.h> 42 __KERNEL_RCSID(0, "$NetBSD: nfs_srvsocket.c,v 1.6 2024/07/05 04:31:54 rin Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/evcnt.h> 47 #include <sys/callout.h> 48 #include <sys/proc.h> 49 #include <sys/mount.h> 50 #include <sys/kernel.h> 51 #include <sys/kmem.h> 52 #include <sys/mbuf.h> 53 #include <sys/vnode.h> 54 #include <sys/domain.h> 55 #include <sys/protosw.h> 56 #include <sys/socket.h> 57 #include <sys/socketvar.h> 58 #include <sys/syslog.h> 59 #include <sys/tprintf.h> 60 #include <sys/namei.h> 61 #include <sys/signal.h> 62 #include <sys/signalvar.h> 63 #include <sys/kauth.h> 64 65 #include <netinet/in.h> 66 #include <netinet/tcp.h> 67 68 #include <nfs/rpcv2.h> 69 #include <nfs/nfsproto.h> 70 #include <nfs/nfs.h> 71 #include <nfs/xdr_subs.h> 72 #include <nfs/nfsm_subs.h> 73 #include <nfs/nfsmount.h> 74 #include <nfs/nfsnode.h> 75 #include <nfs/nfsrtt.h> 76 #include <nfs/nfs_var.h> 77 78 static void nfsrv_wakenfsd_locked(struct nfssvc_sock *); 79 80 int (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *, 81 struct nfssvc_sock *, struct lwp *, 82 struct mbuf **) = { 83 nfsrv_null, 84 nfsrv_getattr, 85 nfsrv_setattr, 86 nfsrv_lookup, 87 nfsrv3_access, 88 nfsrv_readlink, 89 nfsrv_read, 90 nfsrv_write, 91 nfsrv_create, 92 nfsrv_mkdir, 93 nfsrv_symlink, 94 nfsrv_mknod, 95 nfsrv_remove, 96 nfsrv_rmdir, 97 nfsrv_rename, 98 nfsrv_link, 99 nfsrv_readdir, 100 nfsrv_readdirplus, 101 nfsrv_statfs, 102 nfsrv_fsinfo, 103 nfsrv_pathconf, 104 nfsrv_commit, 105 nfsrv_noop 106 }; 107 108 /* 109 * Socket upcall routine for the nfsd sockets. 110 * The void *arg is a pointer to the "struct nfssvc_sock". 111 */ 112 void 113 nfsrv_soupcall(struct socket *so, void *arg, int events, int waitflag) 114 { 115 struct nfssvc_sock *slp = (struct nfssvc_sock *)arg; 116 117 nfsdsock_setbits(slp, SLP_A_NEEDQ); 118 nfsrv_wakenfsd(slp); 119 } 120 121 void 122 nfsrv_rcv(struct nfssvc_sock *slp) 123 { 124 struct socket *so; 125 struct mbuf *m; 126 struct mbuf *mp, *nam; 127 struct uio auio; 128 int flags; 129 int error; 130 int setflags = 0; 131 132 error = nfsdsock_lock(slp, true); 133 if (error) { 134 setflags |= SLP_A_NEEDQ; 135 goto dorecs_unlocked; 136 } 137 138 nfsdsock_clearbits(slp, SLP_A_NEEDQ); 139 140 so = slp->ns_so; 141 if (so->so_type == SOCK_STREAM) { 142 /* 143 * Do soreceive(). 144 */ 145 auio.uio_resid = 1000000000; 146 /* not need to setup uio_vmspace */ 147 flags = MSG_DONTWAIT; 148 error = (*so->so_receive)(so, &nam, &auio, &mp, NULL, &flags); 149 if (error || mp == NULL) { 150 if (error == EWOULDBLOCK) 151 setflags |= SLP_A_NEEDQ; 152 else 153 setflags |= SLP_A_DISCONN; 154 goto dorecs; 155 } 156 m = mp; 157 m_claimm(m, &nfs_mowner); 158 if (slp->ns_rawend) { 159 slp->ns_rawend->m_next = m; 160 slp->ns_cc += 1000000000 - auio.uio_resid; 161 } else { 162 slp->ns_raw = m; 163 slp->ns_cc = 1000000000 - auio.uio_resid; 164 } 165 while (m->m_next) 166 m = m->m_next; 167 slp->ns_rawend = m; 168 169 /* 170 * Now try and parse record(s) out of the raw stream data. 171 */ 172 error = nfsrv_getstream(slp, M_WAIT); 173 if (error) { 174 if (error == EPERM) 175 setflags |= SLP_A_DISCONN; 176 else 177 setflags |= SLP_A_NEEDQ; 178 } 179 } else { 180 do { 181 auio.uio_resid = 1000000000; 182 /* not need to setup uio_vmspace */ 183 flags = MSG_DONTWAIT; 184 error = (*so->so_receive)(so, &nam, &auio, &mp, NULL, 185 &flags); 186 if (mp) { 187 if (nam) { 188 m = nam; 189 m->m_next = mp; 190 } else 191 m = mp; 192 m_claimm(m, &nfs_mowner); 193 if (slp->ns_recend) 194 slp->ns_recend->m_nextpkt = m; 195 else 196 slp->ns_rec = m; 197 slp->ns_recend = m; 198 m->m_nextpkt = (struct mbuf *)0; 199 } 200 if (error) { 201 if ((so->so_proto->pr_flags & PR_CONNREQUIRED) 202 && error != EWOULDBLOCK) { 203 setflags |= SLP_A_DISCONN; 204 goto dorecs; 205 } 206 } 207 } while (mp); 208 } 209 dorecs: 210 nfsdsock_unlock(slp); 211 212 dorecs_unlocked: 213 if (setflags) { 214 nfsdsock_setbits(slp, setflags); 215 } 216 } 217 218 int 219 nfsdsock_lock(struct nfssvc_sock *slp, bool waitok) 220 { 221 222 mutex_enter(&slp->ns_lock); 223 while ((~slp->ns_flags & (SLP_BUSY|SLP_VALID)) == 0) { 224 if (!waitok) { 225 mutex_exit(&slp->ns_lock); 226 return EWOULDBLOCK; 227 } 228 cv_wait(&slp->ns_cv, &slp->ns_lock); 229 } 230 if ((slp->ns_flags & SLP_VALID) == 0) { 231 mutex_exit(&slp->ns_lock); 232 return EINVAL; 233 } 234 KASSERT((slp->ns_flags & SLP_BUSY) == 0); 235 slp->ns_flags |= SLP_BUSY; 236 mutex_exit(&slp->ns_lock); 237 238 return 0; 239 } 240 241 void 242 nfsdsock_unlock(struct nfssvc_sock *slp) 243 { 244 245 mutex_enter(&slp->ns_lock); 246 KASSERT((slp->ns_flags & SLP_BUSY) != 0); 247 cv_broadcast(&slp->ns_cv); 248 slp->ns_flags &= ~SLP_BUSY; 249 mutex_exit(&slp->ns_lock); 250 } 251 252 int 253 nfsdsock_drain(struct nfssvc_sock *slp) 254 { 255 int error = 0; 256 257 mutex_enter(&slp->ns_lock); 258 if ((slp->ns_flags & SLP_VALID) == 0) { 259 error = EINVAL; 260 goto done; 261 } 262 slp->ns_flags &= ~SLP_VALID; 263 while ((slp->ns_flags & SLP_BUSY) != 0) { 264 cv_wait(&slp->ns_cv, &slp->ns_lock); 265 } 266 done: 267 mutex_exit(&slp->ns_lock); 268 269 return error; 270 } 271 272 /* 273 * Try and extract an RPC request from the mbuf data list received on a 274 * stream socket. The "waitflag" argument indicates whether or not it 275 * can sleep. 276 */ 277 int 278 nfsrv_getstream(struct nfssvc_sock *slp, int waitflag) 279 { 280 struct mbuf *m, **mpp; 281 struct mbuf *recm; 282 u_int32_t recmark; 283 int error = 0; 284 285 KASSERT((slp->ns_flags & SLP_BUSY) != 0); 286 for (;;) { 287 if (slp->ns_reclen == 0) { 288 if (slp->ns_cc < NFSX_UNSIGNED) { 289 break; 290 } 291 m = slp->ns_raw; 292 m_copydata(m, 0, NFSX_UNSIGNED, (void *)&recmark); 293 m_adj(m, NFSX_UNSIGNED); 294 slp->ns_cc -= NFSX_UNSIGNED; 295 recmark = ntohl(recmark); 296 slp->ns_reclen = recmark & ~0x80000000; 297 if (recmark & 0x80000000) 298 slp->ns_sflags |= SLP_S_LASTFRAG; 299 else 300 slp->ns_sflags &= ~SLP_S_LASTFRAG; 301 if (slp->ns_reclen > NFS_MAXPACKET) { 302 error = EPERM; 303 break; 304 } 305 } 306 307 /* 308 * Now get the record part. 309 * 310 * Note that slp->ns_reclen may be 0. Linux sometimes 311 * generates 0-length records. 312 */ 313 if (slp->ns_cc == slp->ns_reclen) { 314 recm = slp->ns_raw; 315 slp->ns_raw = slp->ns_rawend = (struct mbuf *)0; 316 slp->ns_cc = slp->ns_reclen = 0; 317 } else if (slp->ns_cc > slp->ns_reclen) { 318 recm = slp->ns_raw; 319 m = m_split(recm, slp->ns_reclen, waitflag); 320 if (m == NULL) { 321 error = EWOULDBLOCK; 322 break; 323 } 324 m_claimm(recm, &nfs_mowner); 325 slp->ns_raw = m; 326 while (m->m_next) 327 m = m->m_next; 328 slp->ns_rawend = m; 329 slp->ns_cc -= slp->ns_reclen; 330 slp->ns_reclen = 0; 331 } else { 332 break; 333 } 334 335 /* 336 * Accumulate the fragments into a record. 337 */ 338 mpp = &slp->ns_frag; 339 while (*mpp) 340 mpp = &((*mpp)->m_next); 341 *mpp = recm; 342 if (slp->ns_sflags & SLP_S_LASTFRAG) { 343 if (slp->ns_recend) 344 slp->ns_recend->m_nextpkt = slp->ns_frag; 345 else 346 slp->ns_rec = slp->ns_frag; 347 slp->ns_recend = slp->ns_frag; 348 slp->ns_frag = NULL; 349 } 350 } 351 352 return error; 353 } 354 355 /* 356 * Parse an RPC header. 357 */ 358 int 359 nfsrv_dorec(struct nfssvc_sock *slp, struct nfsd *nfsd, 360 struct nfsrv_descript **ndp, bool *more) 361 { 362 struct mbuf *m, *nam; 363 struct nfsrv_descript *nd; 364 int error; 365 366 *ndp = NULL; 367 *more = false; 368 369 if (nfsdsock_lock(slp, true)) { 370 return ENOBUFS; 371 } 372 m = slp->ns_rec; 373 if (m == NULL) { 374 nfsdsock_unlock(slp); 375 return ENOBUFS; 376 } 377 slp->ns_rec = m->m_nextpkt; 378 if (slp->ns_rec) { 379 m->m_nextpkt = NULL; 380 *more = true; 381 } else { 382 slp->ns_recend = NULL; 383 } 384 nfsdsock_unlock(slp); 385 386 if (m->m_type == MT_SONAME) { 387 nam = m; 388 m = m->m_next; 389 nam->m_next = NULL; 390 } else 391 nam = NULL; 392 nd = nfsdreq_alloc(); 393 nd->nd_md = nd->nd_mrep = m; 394 nd->nd_nam2 = nam; 395 nd->nd_dpos = mtod(m, void *); 396 error = nfs_getreq(nd, nfsd, true); 397 if (error) { 398 m_freem(nam); 399 nfsdreq_free(nd); 400 return (error); 401 } 402 *ndp = nd; 403 nfsd->nfsd_nd = nd; 404 return (0); 405 } 406 407 bool 408 nfsrv_timer(void) 409 { 410 struct timeval tv; 411 struct nfssvc_sock *slp; 412 u_quad_t cur_usec; 413 struct nfsrv_descript *nd; 414 bool more; 415 416 /* 417 * Scan the write gathering queues for writes that need to be 418 * completed now. 419 */ 420 getmicrotime(&tv); 421 cur_usec = (u_quad_t)tv.tv_sec * 1000000 + (u_quad_t)tv.tv_usec; 422 more = false; 423 mutex_enter(&nfsd_lock); 424 TAILQ_FOREACH(slp, &nfssvc_sockhead, ns_chain) { 425 nd = LIST_FIRST(&slp->ns_tq); 426 if (nd != NULL) { 427 if (nd->nd_time <= cur_usec) { 428 nfsrv_wakenfsd_locked(slp); 429 } 430 more = true; 431 } 432 } 433 mutex_exit(&nfsd_lock); 434 return more; 435 } 436 437 /* 438 * Search for a sleeping nfsd and wake it up. 439 * SIDE EFFECT: If none found, set NFSD_CHECKSLP flag, so that one of the 440 * running nfsds will go look for the work in the nfssvc_sock list. 441 */ 442 static void 443 nfsrv_wakenfsd_locked(struct nfssvc_sock *slp) 444 { 445 struct nfsd *nd; 446 447 KASSERT(mutex_owned(&nfsd_lock)); 448 449 if ((slp->ns_flags & SLP_VALID) == 0) 450 return; 451 if (slp->ns_gflags & SLP_G_DOREC) 452 return; 453 nd = SLIST_FIRST(&nfsd_idle_head); 454 if (nd) { 455 SLIST_REMOVE_HEAD(&nfsd_idle_head, nfsd_idle); 456 if (nd->nfsd_slp) 457 panic("nfsd wakeup"); 458 slp->ns_sref++; 459 KASSERT(slp->ns_sref > 0); 460 nd->nfsd_slp = slp; 461 cv_signal(&nd->nfsd_cv); 462 } else { 463 slp->ns_gflags |= SLP_G_DOREC; 464 nfsd_head_flag |= NFSD_CHECKSLP; 465 TAILQ_INSERT_TAIL(&nfssvc_sockpending, slp, ns_pending); 466 } 467 } 468 469 void 470 nfsrv_wakenfsd(struct nfssvc_sock *slp) 471 { 472 473 mutex_enter(&nfsd_lock); 474 nfsrv_wakenfsd_locked(slp); 475 mutex_exit(&nfsd_lock); 476 } 477 478 int 479 nfsdsock_sendreply(struct nfssvc_sock *slp, struct nfsrv_descript *nd) 480 { 481 int error; 482 483 m_freem(nd->nd_mrep); 484 nd->nd_mrep = NULL; 485 486 mutex_enter(&slp->ns_lock); 487 if ((slp->ns_flags & SLP_SENDING) != 0) { 488 SIMPLEQ_INSERT_TAIL(&slp->ns_sendq, nd, nd_sendq); 489 mutex_exit(&slp->ns_lock); 490 return 0; 491 } 492 KASSERT(SIMPLEQ_EMPTY(&slp->ns_sendq)); 493 slp->ns_flags |= SLP_SENDING; 494 mutex_exit(&slp->ns_lock); 495 496 again: 497 error = nfs_send(slp->ns_so, nd->nd_nam2, nd->nd_mreq, NULL, curlwp); 498 if (nd->nd_nam2) { 499 m_free(nd->nd_nam2); 500 } 501 nfsdreq_free(nd); 502 503 mutex_enter(&slp->ns_lock); 504 KASSERT((slp->ns_flags & SLP_SENDING) != 0); 505 nd = SIMPLEQ_FIRST(&slp->ns_sendq); 506 if (nd != NULL) { 507 SIMPLEQ_REMOVE_HEAD(&slp->ns_sendq, nd_sendq); 508 mutex_exit(&slp->ns_lock); 509 goto again; 510 } 511 slp->ns_flags &= ~SLP_SENDING; 512 mutex_exit(&slp->ns_lock); 513 514 return error; 515 } 516 517 void 518 nfsdsock_setbits(struct nfssvc_sock *slp, int bits) 519 { 520 521 mutex_enter(&slp->ns_alock); 522 slp->ns_aflags |= bits; 523 mutex_exit(&slp->ns_alock); 524 } 525 526 void 527 nfsdsock_clearbits(struct nfssvc_sock *slp, int bits) 528 { 529 530 mutex_enter(&slp->ns_alock); 531 slp->ns_aflags &= ~bits; 532 mutex_exit(&slp->ns_alock); 533 } 534 535 bool 536 nfsdsock_testbits(struct nfssvc_sock *slp, int bits) 537 { 538 539 return (slp->ns_aflags & bits); 540 } 541
Indexes created Sat Sep 20 22:09:52 GMT 2025