| 1 | /* $NetBSD: nfs_iod.c,v 1.7 2015/07/15 03:28:55 manu Exp $ */ |
| 2 | |
| 3 | /* |
| 4 | * Copyright (c) 1989, 1993 |
| 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_syscalls.c 8.5 (Berkeley) 3/30/95 |
| 35 | */ |
| 36 | |
| 37 | #include <sys/cdefs.h> |
| 38 | __KERNEL_RCSID(0, "$NetBSD: nfs_iod.c,v 1.7 2015/07/15 03:28:55 manu Exp $" ); |
| 39 | |
| 40 | #include <sys/param.h> |
| 41 | #include <sys/systm.h> |
| 42 | #include <sys/kernel.h> |
| 43 | #include <sys/file.h> |
| 44 | #include <sys/stat.h> |
| 45 | #include <sys/vnode.h> |
| 46 | #include <sys/mount.h> |
| 47 | #include <sys/proc.h> |
| 48 | #include <sys/uio.h> |
| 49 | #include <sys/malloc.h> |
| 50 | #include <sys/kmem.h> |
| 51 | #include <sys/buf.h> |
| 52 | #include <sys/mbuf.h> |
| 53 | #include <sys/socket.h> |
| 54 | #include <sys/socketvar.h> |
| 55 | #include <sys/signalvar.h> |
| 56 | #include <sys/domain.h> |
| 57 | #include <sys/protosw.h> |
| 58 | #include <sys/namei.h> |
| 59 | #include <sys/syslog.h> |
| 60 | #include <sys/filedesc.h> |
| 61 | #include <sys/kthread.h> |
| 62 | #include <sys/kauth.h> |
| 63 | #include <sys/syscallargs.h> |
| 64 | |
| 65 | #include <netinet/in.h> |
| 66 | #include <netinet/tcp.h> |
| 67 | #include <nfs/xdr_subs.h> |
| 68 | #include <nfs/rpcv2.h> |
| 69 | #include <nfs/nfsproto.h> |
| 70 | #include <nfs/nfs.h> |
| 71 | #include <nfs/nfsm_subs.h> |
| 72 | #include <nfs/nfsrvcache.h> |
| 73 | #include <nfs/nfsmount.h> |
| 74 | #include <nfs/nfsnode.h> |
| 75 | #include <nfs/nfsrtt.h> |
| 76 | #include <nfs/nfs_var.h> |
| 77 | |
| 78 | extern int nuidhash_max; |
| 79 | |
| 80 | /* |
| 81 | * locking order: |
| 82 | * nfs_iodlist_lock -> nid_lock -> nm_lock |
| 83 | */ |
| 84 | kmutex_t nfs_iodlist_lock; |
| 85 | struct nfs_iodlist nfs_iodlist_idle; |
| 86 | struct nfs_iodlist nfs_iodlist_all; |
| 87 | int nfs_niothreads = -1; /* == "0, and has never been set" */ |
| 88 | int nfs_defect = 0; |
| 89 | |
| 90 | /* |
| 91 | * Asynchronous I/O threads for client nfs. |
| 92 | * They do read-ahead and write-behind operations on the block I/O cache. |
| 93 | * Never returns unless it fails or gets killed. |
| 94 | */ |
| 95 | |
| 96 | static void |
| 97 | nfssvc_iod(void *arg) |
| 98 | { |
| 99 | struct buf *bp; |
| 100 | struct nfs_iod *myiod; |
| 101 | struct nfsmount *nmp; |
| 102 | |
| 103 | myiod = kmem_alloc(sizeof(*myiod), KM_SLEEP); |
| 104 | mutex_init(&myiod->nid_lock, MUTEX_DEFAULT, IPL_NONE); |
| 105 | cv_init(&myiod->nid_cv, "nfsiod" ); |
| 106 | myiod->nid_exiting = false; |
| 107 | myiod->nid_mount = NULL; |
| 108 | mutex_enter(&nfs_iodlist_lock); |
| 109 | LIST_INSERT_HEAD(&nfs_iodlist_all, myiod, nid_all); |
| 110 | mutex_exit(&nfs_iodlist_lock); |
| 111 | |
| 112 | for (;;) { |
| 113 | mutex_enter(&nfs_iodlist_lock); |
| 114 | LIST_INSERT_HEAD(&nfs_iodlist_idle, myiod, nid_idle); |
| 115 | mutex_exit(&nfs_iodlist_lock); |
| 116 | |
| 117 | mutex_enter(&myiod->nid_lock); |
| 118 | while (/*CONSTCOND*/ true) { |
| 119 | nmp = myiod->nid_mount; |
| 120 | if (nmp) { |
| 121 | myiod->nid_mount = NULL; |
| 122 | break; |
| 123 | } |
| 124 | if (__predict_false(myiod->nid_exiting)) { |
| 125 | /* |
| 126 | * drop nid_lock to preserve locking order. |
| 127 | */ |
| 128 | mutex_exit(&myiod->nid_lock); |
| 129 | mutex_enter(&nfs_iodlist_lock); |
| 130 | mutex_enter(&myiod->nid_lock); |
| 131 | /* |
| 132 | * recheck nid_mount because nfs_asyncio can |
| 133 | * pick us in the meantime as we are still on |
| 134 | * nfs_iodlist_lock. |
| 135 | */ |
| 136 | if (myiod->nid_mount != NULL) { |
| 137 | mutex_exit(&nfs_iodlist_lock); |
| 138 | continue; |
| 139 | } |
| 140 | LIST_REMOVE(myiod, nid_idle); |
| 141 | mutex_exit(&nfs_iodlist_lock); |
| 142 | goto quit; |
| 143 | } |
| 144 | cv_wait(&myiod->nid_cv, &myiod->nid_lock); |
| 145 | } |
| 146 | mutex_exit(&myiod->nid_lock); |
| 147 | |
| 148 | mutex_enter(&nmp->nm_lock); |
| 149 | while ((bp = TAILQ_FIRST(&nmp->nm_bufq)) != NULL) { |
| 150 | /* Take one off the front of the list */ |
| 151 | TAILQ_REMOVE(&nmp->nm_bufq, bp, b_freelist); |
| 152 | nmp->nm_bufqlen--; |
| 153 | if (nmp->nm_bufqlen < 2 * nmp->nm_bufqiods) { |
| 154 | cv_broadcast(&nmp->nm_aiocv); |
| 155 | } |
| 156 | mutex_exit(&nmp->nm_lock); |
| 157 | KERNEL_LOCK(1, curlwp); |
| 158 | (void)nfs_doio(bp); |
| 159 | KERNEL_UNLOCK_LAST(curlwp); |
| 160 | mutex_enter(&nmp->nm_lock); |
| 161 | /* |
| 162 | * If there are more than one iod on this mount, |
| 163 | * then defect so that the iods can be shared out |
| 164 | * fairly between the mounts |
| 165 | */ |
| 166 | if (nfs_defect && nmp->nm_bufqiods > 1) { |
| 167 | break; |
| 168 | } |
| 169 | } |
| 170 | KASSERT(nmp->nm_bufqiods > 0); |
| 171 | nmp->nm_bufqiods--; |
| 172 | mutex_exit(&nmp->nm_lock); |
| 173 | } |
| 174 | quit: |
| 175 | KASSERT(myiod->nid_mount == NULL); |
| 176 | mutex_exit(&myiod->nid_lock); |
| 177 | |
| 178 | cv_destroy(&myiod->nid_cv); |
| 179 | mutex_destroy(&myiod->nid_lock); |
| 180 | kmem_free(myiod, sizeof(*myiod)); |
| 181 | |
| 182 | kthread_exit(0); |
| 183 | } |
| 184 | |
| 185 | void |
| 186 | nfs_iodinit(void) |
| 187 | { |
| 188 | |
| 189 | mutex_init(&nfs_iodlist_lock, MUTEX_DEFAULT, IPL_NONE); |
| 190 | LIST_INIT(&nfs_iodlist_all); |
| 191 | LIST_INIT(&nfs_iodlist_idle); |
| 192 | } |
| 193 | |
| 194 | void |
| 195 | nfs_iodfini(void) |
| 196 | { |
| 197 | int error __diagused; |
| 198 | |
| 199 | error = nfs_set_niothreads(0); |
| 200 | KASSERT(error == 0); |
| 201 | mutex_destroy(&nfs_iodlist_lock); |
| 202 | } |
| 203 | |
| 204 | int |
| 205 | nfs_iodbusy(struct nfsmount *nmp) |
| 206 | { |
| 207 | struct nfs_iod *iod; |
| 208 | int ret = 0; |
| 209 | |
| 210 | mutex_enter(&nfs_iodlist_lock); |
| 211 | LIST_FOREACH(iod, &nfs_iodlist_all, nid_all) { |
| 212 | if (iod->nid_mount == nmp) |
| 213 | ret++; |
| 214 | } |
| 215 | mutex_exit(&nfs_iodlist_lock); |
| 216 | |
| 217 | return ret; |
| 218 | } |
| 219 | |
| 220 | int |
| 221 | nfs_set_niothreads(int newval) |
| 222 | { |
| 223 | struct nfs_iod *nid; |
| 224 | int error = 0; |
| 225 | int hold_count; |
| 226 | |
| 227 | KERNEL_UNLOCK_ALL(curlwp, &hold_count); |
| 228 | |
| 229 | mutex_enter(&nfs_iodlist_lock); |
| 230 | /* clamp to sane range */ |
| 231 | nfs_niothreads = max(0, min(newval, NFS_MAXASYNCDAEMON)); |
| 232 | |
| 233 | while (nfs_numasync != nfs_niothreads && error == 0) { |
| 234 | while (nfs_numasync < nfs_niothreads) { |
| 235 | |
| 236 | /* |
| 237 | * kthread_create can wait for pagedaemon and |
| 238 | * pagedaemon can wait for nfsiod which needs to acquire |
| 239 | * nfs_iodlist_lock. |
| 240 | */ |
| 241 | |
| 242 | mutex_exit(&nfs_iodlist_lock); |
| 243 | error = kthread_create(PRI_NONE, KTHREAD_MPSAFE, NULL, |
| 244 | nfssvc_iod, NULL, NULL, "nfsio" ); |
| 245 | mutex_enter(&nfs_iodlist_lock); |
| 246 | if (error) { |
| 247 | /* give up */ |
| 248 | nfs_niothreads = nfs_numasync; |
| 249 | break; |
| 250 | } |
| 251 | nfs_numasync++; |
| 252 | } |
| 253 | while (nfs_numasync > nfs_niothreads) { |
| 254 | nid = LIST_FIRST(&nfs_iodlist_all); |
| 255 | if (nid == NULL) { |
| 256 | /* iod has not started yet. */ |
| 257 | kpause("nfsiorm" , false, hz, &nfs_iodlist_lock); |
| 258 | continue; |
| 259 | } |
| 260 | LIST_REMOVE(nid, nid_all); |
| 261 | mutex_enter(&nid->nid_lock); |
| 262 | KASSERT(!nid->nid_exiting); |
| 263 | nid->nid_exiting = true; |
| 264 | cv_signal(&nid->nid_cv); |
| 265 | mutex_exit(&nid->nid_lock); |
| 266 | nfs_numasync--; |
| 267 | } |
| 268 | } |
| 269 | mutex_exit(&nfs_iodlist_lock); |
| 270 | |
| 271 | KERNEL_LOCK(hold_count, curlwp); |
| 272 | return error; |
| 273 | } |
| 274 | |
| 275 | /* |
| 276 | * Get an authorization string for the uid by having the mount_nfs sitting |
| 277 | * on this mount point porpous out of the kernel and do it. |
| 278 | */ |
| 279 | int |
| 280 | nfs_getauth(struct nfsmount *nmp, struct nfsreq *rep, kauth_cred_t cred, char **auth_str, int *auth_len, char *verf_str, int *verf_len, NFSKERBKEY_T key) |
| 281 | /* key: return session key */ |
| 282 | { |
| 283 | int error = 0; |
| 284 | |
| 285 | while ((nmp->nm_iflag & NFSMNT_WAITAUTH) == 0) { |
| 286 | nmp->nm_iflag |= NFSMNT_WANTAUTH; |
| 287 | (void) tsleep((void *)&nmp->nm_authtype, PSOCK, |
| 288 | "nfsauth1" , 2 * hz); |
| 289 | error = nfs_sigintr(nmp, rep, rep->r_lwp); |
| 290 | if (error) { |
| 291 | nmp->nm_iflag &= ~NFSMNT_WANTAUTH; |
| 292 | return (error); |
| 293 | } |
| 294 | } |
| 295 | nmp->nm_iflag &= ~(NFSMNT_WAITAUTH | NFSMNT_WANTAUTH); |
| 296 | nmp->nm_authstr = *auth_str = (char *)malloc(RPCAUTH_MAXSIZ, M_TEMP, M_WAITOK); |
| 297 | nmp->nm_authlen = RPCAUTH_MAXSIZ; |
| 298 | nmp->nm_verfstr = verf_str; |
| 299 | nmp->nm_verflen = *verf_len; |
| 300 | nmp->nm_authuid = kauth_cred_geteuid(cred); |
| 301 | wakeup((void *)&nmp->nm_authstr); |
| 302 | |
| 303 | /* |
| 304 | * And wait for mount_nfs to do its stuff. |
| 305 | */ |
| 306 | while ((nmp->nm_iflag & NFSMNT_HASAUTH) == 0 && error == 0) { |
| 307 | (void) tsleep((void *)&nmp->nm_authlen, PSOCK, |
| 308 | "nfsauth2" , 2 * hz); |
| 309 | error = nfs_sigintr(nmp, rep, rep->r_lwp); |
| 310 | } |
| 311 | if (nmp->nm_iflag & NFSMNT_AUTHERR) { |
| 312 | nmp->nm_iflag &= ~NFSMNT_AUTHERR; |
| 313 | error = EAUTH; |
| 314 | } |
| 315 | if (error) |
| 316 | free((void *)*auth_str, M_TEMP); |
| 317 | else { |
| 318 | *auth_len = nmp->nm_authlen; |
| 319 | *verf_len = nmp->nm_verflen; |
| 320 | memcpy(key, nmp->nm_key, sizeof (NFSKERBKEY_T)); |
| 321 | } |
| 322 | nmp->nm_iflag &= ~NFSMNT_HASAUTH; |
| 323 | nmp->nm_iflag |= NFSMNT_WAITAUTH; |
| 324 | if (nmp->nm_iflag & NFSMNT_WANTAUTH) { |
| 325 | nmp->nm_iflag &= ~NFSMNT_WANTAUTH; |
| 326 | wakeup((void *)&nmp->nm_authtype); |
| 327 | } |
| 328 | return (error); |
| 329 | } |
| 330 | |
| 331 | /* |
| 332 | * Get a nickname authenticator and verifier. |
| 333 | */ |
| 334 | int |
| 335 | nfs_getnickauth(struct nfsmount *nmp, kauth_cred_t cred, char **auth_str, |
| 336 | int *auth_len, char *verf_str, int verf_len) |
| 337 | { |
| 338 | #ifdef NFSKERB |
| 339 | struct timeval ktvin; |
| 340 | #endif |
| 341 | struct timeval ktvout, tv; |
| 342 | struct nfsuid *nuidp; |
| 343 | u_int32_t *nickp, *verfp; |
| 344 | |
| 345 | memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ |
| 346 | |
| 347 | #ifdef DIAGNOSTIC |
| 348 | if (verf_len < (4 * NFSX_UNSIGNED)) |
| 349 | panic("nfs_getnickauth verf too small" ); |
| 350 | #endif |
| 351 | LIST_FOREACH(nuidp, NMUIDHASH(nmp, kauth_cred_geteuid(cred)), nu_hash) { |
| 352 | if (kauth_cred_geteuid(nuidp->nu_cr) == kauth_cred_geteuid(cred)) |
| 353 | break; |
| 354 | } |
| 355 | if (!nuidp || nuidp->nu_expire < time_second) |
| 356 | return (EACCES); |
| 357 | |
| 358 | /* |
| 359 | * Move to the end of the lru list (end of lru == most recently used). |
| 360 | */ |
| 361 | TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, nu_lru); |
| 362 | TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, nu_lru); |
| 363 | |
| 364 | nickp = (u_int32_t *)malloc(2 * NFSX_UNSIGNED, M_TEMP, M_WAITOK); |
| 365 | *nickp++ = txdr_unsigned(RPCAKN_NICKNAME); |
| 366 | *nickp = txdr_unsigned(nuidp->nu_nickname); |
| 367 | *auth_str = (char *)nickp; |
| 368 | *auth_len = 2 * NFSX_UNSIGNED; |
| 369 | |
| 370 | /* |
| 371 | * Now we must encrypt the verifier and package it up. |
| 372 | */ |
| 373 | verfp = (u_int32_t *)verf_str; |
| 374 | *verfp++ = txdr_unsigned(RPCAKN_NICKNAME); |
| 375 | getmicrotime(&tv); |
| 376 | if (tv.tv_sec > nuidp->nu_timestamp.tv_sec || |
| 377 | (tv.tv_sec == nuidp->nu_timestamp.tv_sec && |
| 378 | tv.tv_usec > nuidp->nu_timestamp.tv_usec)) |
| 379 | nuidp->nu_timestamp = tv; |
| 380 | else |
| 381 | nuidp->nu_timestamp.tv_usec++; |
| 382 | #ifdef NFSKERB |
| 383 | ktvin.tv_sec = txdr_unsigned(nuidp->nu_timestamp.tv_sec); |
| 384 | ktvin.tv_usec = txdr_unsigned(nuidp->nu_timestamp.tv_usec); |
| 385 | |
| 386 | /* |
| 387 | * Now encrypt the timestamp verifier in ecb mode using the session |
| 388 | * key. |
| 389 | */ |
| 390 | XXX |
| 391 | #endif |
| 392 | |
| 393 | *verfp++ = ktvout.tv_sec; |
| 394 | *verfp++ = ktvout.tv_usec; |
| 395 | *verfp = 0; |
| 396 | return (0); |
| 397 | } |
| 398 | |
| 399 | /* |
| 400 | * Save the current nickname in a hash list entry on the mount point. |
| 401 | */ |
| 402 | int |
| 403 | nfs_savenickauth(struct nfsmount *nmp, kauth_cred_t cred, int len, NFSKERBKEY_T key, struct mbuf **mdp, char **dposp, struct mbuf *mrep) |
| 404 | { |
| 405 | struct nfsuid *nuidp; |
| 406 | u_int32_t *tl; |
| 407 | int32_t t1; |
| 408 | struct mbuf *md = *mdp; |
| 409 | struct timeval ktvin, ktvout; |
| 410 | u_int32_t nick; |
| 411 | char *dpos = *dposp, *cp2; |
| 412 | int deltasec, error = 0; |
| 413 | |
| 414 | memset(&ktvout, 0, sizeof ktvout); /* XXX gcc */ |
| 415 | |
| 416 | if (len == (3 * NFSX_UNSIGNED)) { |
| 417 | nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); |
| 418 | ktvin.tv_sec = *tl++; |
| 419 | ktvin.tv_usec = *tl++; |
| 420 | nick = fxdr_unsigned(u_int32_t, *tl); |
| 421 | |
| 422 | /* |
| 423 | * Decrypt the timestamp in ecb mode. |
| 424 | */ |
| 425 | #ifdef NFSKERB |
| 426 | XXX |
| 427 | #else |
| 428 | (void)ktvin.tv_sec; |
| 429 | #endif |
| 430 | ktvout.tv_sec = fxdr_unsigned(long, ktvout.tv_sec); |
| 431 | ktvout.tv_usec = fxdr_unsigned(long, ktvout.tv_usec); |
| 432 | deltasec = time_second - ktvout.tv_sec; |
| 433 | if (deltasec < 0) |
| 434 | deltasec = -deltasec; |
| 435 | /* |
| 436 | * If ok, add it to the hash list for the mount point. |
| 437 | */ |
| 438 | if (deltasec <= NFS_KERBCLOCKSKEW) { |
| 439 | if (nmp->nm_numuids < nuidhash_max) { |
| 440 | nmp->nm_numuids++; |
| 441 | nuidp = kmem_alloc(sizeof(*nuidp), KM_SLEEP); |
| 442 | } else { |
| 443 | nuidp = TAILQ_FIRST(&nmp->nm_uidlruhead); |
| 444 | LIST_REMOVE(nuidp, nu_hash); |
| 445 | TAILQ_REMOVE(&nmp->nm_uidlruhead, nuidp, |
| 446 | nu_lru); |
| 447 | } |
| 448 | nuidp->nu_flag = 0; |
| 449 | kauth_cred_seteuid(nuidp->nu_cr, kauth_cred_geteuid(cred)); |
| 450 | nuidp->nu_expire = time_second + NFS_KERBTTL; |
| 451 | nuidp->nu_timestamp = ktvout; |
| 452 | nuidp->nu_nickname = nick; |
| 453 | memcpy(nuidp->nu_key, key, sizeof (NFSKERBKEY_T)); |
| 454 | TAILQ_INSERT_TAIL(&nmp->nm_uidlruhead, nuidp, |
| 455 | nu_lru); |
| 456 | LIST_INSERT_HEAD(NMUIDHASH(nmp, kauth_cred_geteuid(cred)), |
| 457 | nuidp, nu_hash); |
| 458 | } |
| 459 | } else |
| 460 | nfsm_adv(nfsm_rndup(len)); |
| 461 | nfsmout: |
| 462 | *mdp = md; |
| 463 | *dposp = dpos; |
| 464 | return (error); |
| 465 | } |
| 466 | |