| 1 | /* $NetBSD: nfs_clntsocket.c,v 1.5 2016/06/17 14:28:29 christos 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_clntsocket.c,v 1.5 2016/06/17 14:28:29 christos Exp $" ); |
| 43 | |
| 44 | #ifdef _KERNEL_OPT |
| 45 | #include "opt_nfs.h" |
| 46 | #include "opt_mbuftrace.h" |
| 47 | #endif |
| 48 | |
| 49 | #include <sys/param.h> |
| 50 | #include <sys/systm.h> |
| 51 | #include <sys/evcnt.h> |
| 52 | #include <sys/callout.h> |
| 53 | #include <sys/proc.h> |
| 54 | #include <sys/mount.h> |
| 55 | #include <sys/kernel.h> |
| 56 | #include <sys/kmem.h> |
| 57 | #include <sys/mbuf.h> |
| 58 | #include <sys/vnode.h> |
| 59 | #include <sys/domain.h> |
| 60 | #include <sys/protosw.h> |
| 61 | #include <sys/socket.h> |
| 62 | #include <sys/socketvar.h> |
| 63 | #include <sys/syslog.h> |
| 64 | #include <sys/tprintf.h> |
| 65 | #include <sys/namei.h> |
| 66 | #include <sys/signal.h> |
| 67 | #include <sys/signalvar.h> |
| 68 | #include <sys/kauth.h> |
| 69 | |
| 70 | #include <netinet/in.h> |
| 71 | #include <netinet/tcp.h> |
| 72 | |
| 73 | #include <nfs/rpcv2.h> |
| 74 | #include <nfs/nfsproto.h> |
| 75 | #include <nfs/nfs.h> |
| 76 | #include <nfs/xdr_subs.h> |
| 77 | #include <nfs/nfsm_subs.h> |
| 78 | #include <nfs/nfsmount.h> |
| 79 | #include <nfs/nfsnode.h> |
| 80 | #include <nfs/nfsrtt.h> |
| 81 | #include <nfs/nfs_var.h> |
| 82 | |
| 83 | static int nfs_sndlock(struct nfsmount *, struct nfsreq *); |
| 84 | static void nfs_sndunlock(struct nfsmount *); |
| 85 | |
| 86 | /* |
| 87 | * Receive a Sun RPC Request/Reply. For SOCK_DGRAM, the work is all |
| 88 | * done by soreceive(), but for SOCK_STREAM we must deal with the Record |
| 89 | * Mark and consolidate the data into a new mbuf list. |
| 90 | * nb: Sometimes TCP passes the data up to soreceive() in long lists of |
| 91 | * small mbufs. |
| 92 | * For SOCK_STREAM we must be very careful to read an entire record once |
| 93 | * we have read any of it, even if the system call has been interrupted. |
| 94 | */ |
| 95 | static int |
| 96 | nfs_receive(struct nfsreq *rep, struct mbuf **aname, struct mbuf **mp, |
| 97 | struct lwp *l) |
| 98 | { |
| 99 | struct socket *so; |
| 100 | struct uio auio; |
| 101 | struct iovec aio; |
| 102 | struct mbuf *m; |
| 103 | struct mbuf *control; |
| 104 | u_int32_t len; |
| 105 | struct mbuf **getnam; |
| 106 | int error, sotype, rcvflg; |
| 107 | |
| 108 | /* |
| 109 | * Set up arguments for soreceive() |
| 110 | */ |
| 111 | *mp = NULL; |
| 112 | *aname = NULL; |
| 113 | sotype = rep->r_nmp->nm_sotype; |
| 114 | |
| 115 | /* |
| 116 | * For reliable protocols, lock against other senders/receivers |
| 117 | * in case a reconnect is necessary. |
| 118 | * For SOCK_STREAM, first get the Record Mark to find out how much |
| 119 | * more there is to get. |
| 120 | * We must lock the socket against other receivers |
| 121 | * until we have an entire rpc request/reply. |
| 122 | */ |
| 123 | if (sotype != SOCK_DGRAM) { |
| 124 | error = nfs_sndlock(rep->r_nmp, rep); |
| 125 | if (error) |
| 126 | return (error); |
| 127 | tryagain: |
| 128 | /* |
| 129 | * Check for fatal errors and resending request. |
| 130 | */ |
| 131 | /* |
| 132 | * Ugh: If a reconnect attempt just happened, nm_so |
| 133 | * would have changed. NULL indicates a failed |
| 134 | * attempt that has essentially shut down this |
| 135 | * mount point. |
| 136 | */ |
| 137 | if (rep->r_mrep || (rep->r_flags & R_SOFTTERM)) { |
| 138 | nfs_sndunlock(rep->r_nmp); |
| 139 | return (EINTR); |
| 140 | } |
| 141 | so = rep->r_nmp->nm_so; |
| 142 | if (!so) { |
| 143 | error = nfs_reconnect(rep); |
| 144 | if (error) { |
| 145 | nfs_sndunlock(rep->r_nmp); |
| 146 | return (error); |
| 147 | } |
| 148 | goto tryagain; |
| 149 | } |
| 150 | while (rep->r_flags & R_MUSTRESEND) { |
| 151 | m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); |
| 152 | nfsstats.rpcretries++; |
| 153 | rep->r_rtt = 0; |
| 154 | rep->r_flags &= ~R_TIMING; |
| 155 | error = nfs_send(so, rep->r_nmp->nm_nam, m, rep, l); |
| 156 | if (error) { |
| 157 | if (error == EINTR || error == ERESTART || |
| 158 | (error = nfs_reconnect(rep)) != 0) { |
| 159 | nfs_sndunlock(rep->r_nmp); |
| 160 | return (error); |
| 161 | } |
| 162 | goto tryagain; |
| 163 | } |
| 164 | } |
| 165 | nfs_sndunlock(rep->r_nmp); |
| 166 | if (sotype == SOCK_STREAM) { |
| 167 | aio.iov_base = (void *) &len; |
| 168 | aio.iov_len = sizeof(u_int32_t); |
| 169 | auio.uio_iov = &aio; |
| 170 | auio.uio_iovcnt = 1; |
| 171 | auio.uio_rw = UIO_READ; |
| 172 | auio.uio_offset = 0; |
| 173 | auio.uio_resid = sizeof(u_int32_t); |
| 174 | UIO_SETUP_SYSSPACE(&auio); |
| 175 | do { |
| 176 | rcvflg = MSG_WAITALL; |
| 177 | error = (*so->so_receive)(so, NULL, &auio, |
| 178 | NULL, NULL, &rcvflg); |
| 179 | if (error == EWOULDBLOCK && rep) { |
| 180 | if (rep->r_flags & R_SOFTTERM) |
| 181 | return (EINTR); |
| 182 | /* |
| 183 | * if it seems that the server died after it |
| 184 | * received our request, set EPIPE so that |
| 185 | * we'll reconnect and retransmit requests. |
| 186 | */ |
| 187 | if (rep->r_rexmit >= rep->r_nmp->nm_retry) { |
| 188 | nfsstats.rpctimeouts++; |
| 189 | error = EPIPE; |
| 190 | } |
| 191 | } |
| 192 | } while (error == EWOULDBLOCK); |
| 193 | if (!error && auio.uio_resid > 0) { |
| 194 | /* |
| 195 | * Don't log a 0 byte receive; it means |
| 196 | * that the socket has been closed, and |
| 197 | * can happen during normal operation |
| 198 | * (forcible unmount or Solaris server). |
| 199 | */ |
| 200 | if (auio.uio_resid != sizeof (u_int32_t)) |
| 201 | log(LOG_INFO, |
| 202 | "short receive (%lu/%lu) from nfs server %s\n" , |
| 203 | (u_long)sizeof(u_int32_t) - auio.uio_resid, |
| 204 | (u_long)sizeof(u_int32_t), |
| 205 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); |
| 206 | error = EPIPE; |
| 207 | } |
| 208 | if (error) |
| 209 | goto errout; |
| 210 | len = ntohl(len) & ~0x80000000; |
| 211 | /* |
| 212 | * This is SERIOUS! We are out of sync with the sender |
| 213 | * and forcing a disconnect/reconnect is all I can do. |
| 214 | */ |
| 215 | if (len > NFS_MAXPACKET) { |
| 216 | log(LOG_ERR, "%s (%d) from nfs server %s\n" , |
| 217 | "impossible packet length" , |
| 218 | len, |
| 219 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); |
| 220 | error = EFBIG; |
| 221 | goto errout; |
| 222 | } |
| 223 | auio.uio_resid = len; |
| 224 | do { |
| 225 | rcvflg = MSG_WAITALL; |
| 226 | error = (*so->so_receive)(so, NULL, |
| 227 | &auio, mp, NULL, &rcvflg); |
| 228 | } while (error == EWOULDBLOCK || error == EINTR || |
| 229 | error == ERESTART); |
| 230 | if (!error && auio.uio_resid > 0) { |
| 231 | if (len != auio.uio_resid) |
| 232 | log(LOG_INFO, |
| 233 | "short receive (%lu/%d) from nfs server %s\n" , |
| 234 | (u_long)len - auio.uio_resid, len, |
| 235 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); |
| 236 | error = EPIPE; |
| 237 | } |
| 238 | } else { |
| 239 | /* |
| 240 | * NB: Since uio_resid is big, MSG_WAITALL is ignored |
| 241 | * and soreceive() will return when it has either a |
| 242 | * control msg or a data msg. |
| 243 | * We have no use for control msg., but must grab them |
| 244 | * and then throw them away so we know what is going |
| 245 | * on. |
| 246 | */ |
| 247 | auio.uio_resid = len = 100000000; /* Anything Big */ |
| 248 | /* not need to setup uio_vmspace */ |
| 249 | do { |
| 250 | rcvflg = 0; |
| 251 | error = (*so->so_receive)(so, NULL, |
| 252 | &auio, mp, &control, &rcvflg); |
| 253 | if (control) |
| 254 | m_freem(control); |
| 255 | if (error == EWOULDBLOCK && rep) { |
| 256 | if (rep->r_flags & R_SOFTTERM) |
| 257 | return (EINTR); |
| 258 | } |
| 259 | } while (error == EWOULDBLOCK || |
| 260 | (!error && *mp == NULL && control)); |
| 261 | if ((rcvflg & MSG_EOR) == 0) |
| 262 | printf("Egad!!\n" ); |
| 263 | if (!error && *mp == NULL) |
| 264 | error = EPIPE; |
| 265 | len -= auio.uio_resid; |
| 266 | } |
| 267 | errout: |
| 268 | if (error && error != EINTR && error != ERESTART) { |
| 269 | m_freem(*mp); |
| 270 | *mp = NULL; |
| 271 | if (error != EPIPE) |
| 272 | log(LOG_INFO, |
| 273 | "receive error %d from nfs server %s\n" , |
| 274 | error, |
| 275 | rep->r_nmp->nm_mountp->mnt_stat.f_mntfromname); |
| 276 | error = nfs_sndlock(rep->r_nmp, rep); |
| 277 | if (!error) |
| 278 | error = nfs_reconnect(rep); |
| 279 | if (!error) |
| 280 | goto tryagain; |
| 281 | else |
| 282 | nfs_sndunlock(rep->r_nmp); |
| 283 | } |
| 284 | } else { |
| 285 | if ((so = rep->r_nmp->nm_so) == NULL) |
| 286 | return (EACCES); |
| 287 | if (so->so_state & SS_ISCONNECTED) |
| 288 | getnam = NULL; |
| 289 | else |
| 290 | getnam = aname; |
| 291 | auio.uio_resid = len = 1000000; |
| 292 | /* not need to setup uio_vmspace */ |
| 293 | do { |
| 294 | rcvflg = 0; |
| 295 | error = (*so->so_receive)(so, getnam, &auio, mp, |
| 296 | NULL, &rcvflg); |
| 297 | if (error == EWOULDBLOCK && |
| 298 | (rep->r_flags & R_SOFTTERM)) |
| 299 | return (EINTR); |
| 300 | } while (error == EWOULDBLOCK); |
| 301 | len -= auio.uio_resid; |
| 302 | if (!error && *mp == NULL) |
| 303 | error = EPIPE; |
| 304 | } |
| 305 | if (error) { |
| 306 | m_freem(*mp); |
| 307 | *mp = NULL; |
| 308 | } |
| 309 | return (error); |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * Implement receipt of reply on a socket. |
| 314 | * We must search through the list of received datagrams matching them |
| 315 | * with outstanding requests using the xid, until ours is found. |
| 316 | */ |
| 317 | /* ARGSUSED */ |
| 318 | static int |
| 319 | nfs_reply(struct nfsreq *myrep, struct lwp *lwp) |
| 320 | { |
| 321 | struct nfsreq *rep; |
| 322 | struct nfsmount *nmp = myrep->r_nmp; |
| 323 | int32_t t1; |
| 324 | struct mbuf *mrep, *nam, *md; |
| 325 | u_int32_t rxid, *tl; |
| 326 | char *dpos, *cp2; |
| 327 | int error, s; |
| 328 | |
| 329 | /* |
| 330 | * Loop around until we get our own reply |
| 331 | */ |
| 332 | for (;;) { |
| 333 | /* |
| 334 | * Lock against other receivers so that I don't get stuck in |
| 335 | * sbwait() after someone else has received my reply for me. |
| 336 | * Also necessary for connection based protocols to avoid |
| 337 | * race conditions during a reconnect. |
| 338 | */ |
| 339 | error = nfs_rcvlock(nmp, myrep); |
| 340 | if (error == EALREADY) |
| 341 | return (0); |
| 342 | if (error) |
| 343 | return (error); |
| 344 | /* |
| 345 | * Get the next Rpc reply off the socket |
| 346 | */ |
| 347 | |
| 348 | mutex_enter(&nmp->nm_lock); |
| 349 | nmp->nm_waiters++; |
| 350 | mutex_exit(&nmp->nm_lock); |
| 351 | |
| 352 | error = nfs_receive(myrep, &nam, &mrep, lwp); |
| 353 | |
| 354 | mutex_enter(&nmp->nm_lock); |
| 355 | nmp->nm_waiters--; |
| 356 | cv_signal(&nmp->nm_disconcv); |
| 357 | mutex_exit(&nmp->nm_lock); |
| 358 | |
| 359 | if (error) { |
| 360 | nfs_rcvunlock(nmp); |
| 361 | |
| 362 | if (nmp->nm_iflag & NFSMNT_DISMNT) { |
| 363 | /* |
| 364 | * Oops, we're going away now.. |
| 365 | */ |
| 366 | return error; |
| 367 | } |
| 368 | /* |
| 369 | * Ignore routing errors on connectionless protocols? ? |
| 370 | */ |
| 371 | if (NFSIGNORE_SOERROR(nmp->nm_soflags, error)) { |
| 372 | nmp->nm_so->so_error = 0; |
| 373 | #ifdef DEBUG |
| 374 | if (ratecheck(&nfs_reply_last_err_time, |
| 375 | &nfs_err_interval)) |
| 376 | printf("%s: ignoring error %d\n" , |
| 377 | __func__, error); |
| 378 | #endif |
| 379 | continue; |
| 380 | } |
| 381 | return (error); |
| 382 | } |
| 383 | if (nam) |
| 384 | m_freem(nam); |
| 385 | |
| 386 | /* |
| 387 | * Get the xid and check that it is an rpc reply |
| 388 | */ |
| 389 | md = mrep; |
| 390 | dpos = mtod(md, void *); |
| 391 | nfsm_dissect(tl, u_int32_t *, 2*NFSX_UNSIGNED); |
| 392 | rxid = *tl++; |
| 393 | if (*tl != rpc_reply) { |
| 394 | nfsstats.rpcinvalid++; |
| 395 | m_freem(mrep); |
| 396 | nfsmout: |
| 397 | nfs_rcvunlock(nmp); |
| 398 | continue; |
| 399 | } |
| 400 | |
| 401 | /* |
| 402 | * Loop through the request list to match up the reply |
| 403 | * Iff no match, just drop the datagram |
| 404 | */ |
| 405 | s = splsoftnet(); |
| 406 | TAILQ_FOREACH(rep, &nfs_reqq, r_chain) { |
| 407 | if (rep->r_mrep != NULL || rxid != rep->r_xid) |
| 408 | continue; |
| 409 | |
| 410 | /* Found it.. */ |
| 411 | rep->r_mrep = mrep; |
| 412 | rep->r_md = md; |
| 413 | rep->r_dpos = dpos; |
| 414 | if (nfsrtton) { |
| 415 | struct rttl *rt; |
| 416 | int proct = nfs_proct[rep->r_procnum]; |
| 417 | |
| 418 | rt = &nfsrtt.rttl[nfsrtt.pos]; |
| 419 | rt->proc = rep->r_procnum; |
| 420 | rt->rto = NFS_RTO(nmp, proct); |
| 421 | rt->sent = nmp->nm_sent; |
| 422 | rt->cwnd = nmp->nm_cwnd; |
| 423 | rt->srtt = nmp->nm_srtt[proct - 1]; |
| 424 | rt->sdrtt = nmp->nm_sdrtt[proct - 1]; |
| 425 | rt->fsid = nmp->nm_mountp->mnt_stat.f_fsidx; |
| 426 | getmicrotime(&rt->tstamp); |
| 427 | if (rep->r_flags & R_TIMING) |
| 428 | rt->rtt = rep->r_rtt; |
| 429 | else |
| 430 | rt->rtt = 1000000; |
| 431 | nfsrtt.pos = (nfsrtt.pos + 1) % NFSRTTLOGSIZ; |
| 432 | } |
| 433 | /* |
| 434 | * Update congestion window. |
| 435 | * Do the additive increase of |
| 436 | * one rpc/rtt. |
| 437 | */ |
| 438 | if (nmp->nm_cwnd <= nmp->nm_sent) { |
| 439 | nmp->nm_cwnd += |
| 440 | (NFS_CWNDSCALE * NFS_CWNDSCALE + |
| 441 | (nmp->nm_cwnd >> 1)) / nmp->nm_cwnd; |
| 442 | if (nmp->nm_cwnd > NFS_MAXCWND) |
| 443 | nmp->nm_cwnd = NFS_MAXCWND; |
| 444 | } |
| 445 | rep->r_flags &= ~R_SENT; |
| 446 | nmp->nm_sent -= NFS_CWNDSCALE; |
| 447 | /* |
| 448 | * Update rtt using a gain of 0.125 on the mean |
| 449 | * and a gain of 0.25 on the deviation. |
| 450 | */ |
| 451 | if (rep->r_flags & R_TIMING) { |
| 452 | /* |
| 453 | * Since the timer resolution of |
| 454 | * NFS_HZ is so course, it can often |
| 455 | * result in r_rtt == 0. Since |
| 456 | * r_rtt == N means that the actual |
| 457 | * rtt is between N+dt and N+2-dt ticks, |
| 458 | * add 1. |
| 459 | */ |
| 460 | t1 = rep->r_rtt + 1; |
| 461 | t1 -= (NFS_SRTT(rep) >> 3); |
| 462 | NFS_SRTT(rep) += t1; |
| 463 | if (t1 < 0) |
| 464 | t1 = -t1; |
| 465 | t1 -= (NFS_SDRTT(rep) >> 2); |
| 466 | NFS_SDRTT(rep) += t1; |
| 467 | } |
| 468 | nmp->nm_timeouts = 0; |
| 469 | break; |
| 470 | } |
| 471 | splx(s); |
| 472 | nfs_rcvunlock(nmp); |
| 473 | /* |
| 474 | * If not matched to a request, drop it. |
| 475 | * If it's mine, get out. |
| 476 | */ |
| 477 | if (rep == 0) { |
| 478 | nfsstats.rpcunexpected++; |
| 479 | m_freem(mrep); |
| 480 | } else if (rep == myrep) { |
| 481 | if (rep->r_mrep == NULL) |
| 482 | panic("nfsreply nil" ); |
| 483 | return (0); |
| 484 | } |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | /* |
| 489 | * nfs_request - goes something like this |
| 490 | * - fill in request struct |
| 491 | * - links it into list |
| 492 | * - calls nfs_send() for first transmit |
| 493 | * - calls nfs_receive() to get reply |
| 494 | * - break down rpc header and return with nfs reply pointed to |
| 495 | * by mrep or error |
| 496 | * nb: always frees up mreq mbuf list |
| 497 | */ |
| 498 | int |
| 499 | nfs_request(struct nfsnode *np, struct mbuf *mrest, int procnum, struct lwp *lwp, kauth_cred_t cred, struct mbuf **mrp, struct mbuf **mdp, char **dposp, int *rexmitp) |
| 500 | { |
| 501 | struct mbuf *m, *mrep; |
| 502 | struct nfsreq *rep; |
| 503 | u_int32_t *tl; |
| 504 | int i; |
| 505 | struct nfsmount *nmp = VFSTONFS(np->n_vnode->v_mount); |
| 506 | struct mbuf *md, *mheadend; |
| 507 | char nickv[RPCX_NICKVERF]; |
| 508 | time_t waituntil; |
| 509 | char *dpos, *cp2; |
| 510 | int t1, s, error = 0, mrest_len, auth_len, auth_type; |
| 511 | int trylater_delay = NFS_TRYLATERDEL, failed_auth = 0; |
| 512 | int verf_len, verf_type; |
| 513 | u_int32_t xid; |
| 514 | char *auth_str, *verf_str; |
| 515 | NFSKERBKEY_T key; /* save session key */ |
| 516 | kauth_cred_t acred; |
| 517 | struct mbuf *mrest_backup = NULL; |
| 518 | kauth_cred_t origcred = NULL; /* XXX: gcc */ |
| 519 | bool retry_cred = true; |
| 520 | bool use_opencred = (np->n_flag & NUSEOPENCRED) != 0; |
| 521 | |
| 522 | if (rexmitp != NULL) |
| 523 | *rexmitp = 0; |
| 524 | |
| 525 | acred = kauth_cred_alloc(); |
| 526 | |
| 527 | tryagain_cred: |
| 528 | KASSERT(cred != NULL); |
| 529 | rep = kmem_alloc(sizeof(*rep), KM_SLEEP); |
| 530 | rep->r_nmp = nmp; |
| 531 | KASSERT(lwp == NULL || lwp == curlwp); |
| 532 | rep->r_lwp = lwp; |
| 533 | rep->r_procnum = procnum; |
| 534 | i = 0; |
| 535 | m = mrest; |
| 536 | while (m) { |
| 537 | i += m->m_len; |
| 538 | m = m->m_next; |
| 539 | } |
| 540 | mrest_len = i; |
| 541 | |
| 542 | /* |
| 543 | * Get the RPC header with authorization. |
| 544 | */ |
| 545 | kerbauth: |
| 546 | verf_str = auth_str = NULL; |
| 547 | if (nmp->nm_flag & NFSMNT_KERB) { |
| 548 | verf_str = nickv; |
| 549 | verf_len = sizeof (nickv); |
| 550 | auth_type = RPCAUTH_KERB4; |
| 551 | memset((void *)key, 0, sizeof (key)); |
| 552 | if (failed_auth || nfs_getnickauth(nmp, cred, &auth_str, |
| 553 | &auth_len, verf_str, verf_len)) { |
| 554 | error = nfs_getauth(nmp, rep, cred, &auth_str, |
| 555 | &auth_len, verf_str, &verf_len, key); |
| 556 | if (error) { |
| 557 | kmem_free(rep, sizeof(*rep)); |
| 558 | m_freem(mrest); |
| 559 | KASSERT(kauth_cred_getrefcnt(acred) == 1); |
| 560 | kauth_cred_free(acred); |
| 561 | return (error); |
| 562 | } |
| 563 | } |
| 564 | retry_cred = false; |
| 565 | } else { |
| 566 | /* AUTH_UNIX */ |
| 567 | uid_t uid; |
| 568 | gid_t gid; |
| 569 | |
| 570 | /* |
| 571 | * on the most unix filesystems, permission checks are |
| 572 | * done when the file is open(2)'ed. |
| 573 | * ie. once a file is successfully open'ed, |
| 574 | * following i/o operations never fail with EACCES. |
| 575 | * we try to follow the semantics as far as possible. |
| 576 | * |
| 577 | * note that we expect that the nfs server always grant |
| 578 | * accesses by the file's owner. |
| 579 | */ |
| 580 | origcred = cred; |
| 581 | switch (procnum) { |
| 582 | case NFSPROC_READ: |
| 583 | case NFSPROC_WRITE: |
| 584 | case NFSPROC_COMMIT: |
| 585 | uid = np->n_vattr->va_uid; |
| 586 | gid = np->n_vattr->va_gid; |
| 587 | if (kauth_cred_geteuid(cred) == uid && |
| 588 | kauth_cred_getegid(cred) == gid) { |
| 589 | retry_cred = false; |
| 590 | break; |
| 591 | } |
| 592 | if (use_opencred) |
| 593 | break; |
| 594 | kauth_cred_setuid(acred, uid); |
| 595 | kauth_cred_seteuid(acred, uid); |
| 596 | kauth_cred_setsvuid(acred, uid); |
| 597 | kauth_cred_setgid(acred, gid); |
| 598 | kauth_cred_setegid(acred, gid); |
| 599 | kauth_cred_setsvgid(acred, gid); |
| 600 | cred = acred; |
| 601 | break; |
| 602 | default: |
| 603 | retry_cred = false; |
| 604 | break; |
| 605 | } |
| 606 | /* |
| 607 | * backup mbuf chain if we can need it later to retry. |
| 608 | * |
| 609 | * XXX maybe we can keep a direct reference to |
| 610 | * mrest without doing m_copym, but it's ...ugly. |
| 611 | */ |
| 612 | if (retry_cred) |
| 613 | mrest_backup = m_copym(mrest, 0, M_COPYALL, M_WAIT); |
| 614 | auth_type = RPCAUTH_UNIX; |
| 615 | /* XXX elad - ngroups */ |
| 616 | auth_len = (((kauth_cred_ngroups(cred) > nmp->nm_numgrps) ? |
| 617 | nmp->nm_numgrps : kauth_cred_ngroups(cred)) << 2) + |
| 618 | 5 * NFSX_UNSIGNED; |
| 619 | } |
| 620 | m = nfsm_rpchead(cred, nmp->nm_flag, procnum, auth_type, auth_len, |
| 621 | auth_str, verf_len, verf_str, mrest, mrest_len, &mheadend, &xid); |
| 622 | if (auth_str) |
| 623 | free(auth_str, M_TEMP); |
| 624 | |
| 625 | /* |
| 626 | * For stream protocols, insert a Sun RPC Record Mark. |
| 627 | */ |
| 628 | if (nmp->nm_sotype == SOCK_STREAM) { |
| 629 | M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); |
| 630 | *mtod(m, u_int32_t *) = htonl(0x80000000 | |
| 631 | (m->m_pkthdr.len - NFSX_UNSIGNED)); |
| 632 | } |
| 633 | rep->r_mreq = m; |
| 634 | rep->r_xid = xid; |
| 635 | tryagain: |
| 636 | if (nmp->nm_flag & NFSMNT_SOFT) |
| 637 | rep->r_retry = nmp->nm_retry; |
| 638 | else |
| 639 | rep->r_retry = NFS_MAXREXMIT + 1; /* past clip limit */ |
| 640 | rep->r_rtt = rep->r_rexmit = 0; |
| 641 | if (nfs_proct[procnum] > 0) |
| 642 | rep->r_flags = R_TIMING; |
| 643 | else |
| 644 | rep->r_flags = 0; |
| 645 | rep->r_mrep = NULL; |
| 646 | |
| 647 | /* |
| 648 | * Do the client side RPC. |
| 649 | */ |
| 650 | nfsstats.rpcrequests++; |
| 651 | /* |
| 652 | * Chain request into list of outstanding requests. Be sure |
| 653 | * to put it LAST so timer finds oldest requests first. |
| 654 | */ |
| 655 | s = splsoftnet(); |
| 656 | TAILQ_INSERT_TAIL(&nfs_reqq, rep, r_chain); |
| 657 | nfs_timer_start(); |
| 658 | |
| 659 | /* |
| 660 | * If backing off another request or avoiding congestion, don't |
| 661 | * send this one now but let timer do it. If not timing a request, |
| 662 | * do it now. |
| 663 | */ |
| 664 | if (nmp->nm_so && (nmp->nm_sotype != SOCK_DGRAM || |
| 665 | (nmp->nm_flag & NFSMNT_DUMBTIMR) || nmp->nm_sent < nmp->nm_cwnd)) { |
| 666 | splx(s); |
| 667 | if (nmp->nm_soflags & PR_CONNREQUIRED) |
| 668 | error = nfs_sndlock(nmp, rep); |
| 669 | if (!error) { |
| 670 | m = m_copym(rep->r_mreq, 0, M_COPYALL, M_WAIT); |
| 671 | error = nfs_send(nmp->nm_so, nmp->nm_nam, m, rep, lwp); |
| 672 | if (nmp->nm_soflags & PR_CONNREQUIRED) |
| 673 | nfs_sndunlock(nmp); |
| 674 | } |
| 675 | s = splsoftnet(); |
| 676 | if (!error && (rep->r_flags & R_MUSTRESEND) == 0) { |
| 677 | if ((rep->r_flags & R_SENT) == 0) { |
| 678 | nmp->nm_sent += NFS_CWNDSCALE; |
| 679 | rep->r_flags |= R_SENT; |
| 680 | } |
| 681 | } |
| 682 | splx(s); |
| 683 | } else { |
| 684 | splx(s); |
| 685 | rep->r_rtt = -1; |
| 686 | } |
| 687 | |
| 688 | /* |
| 689 | * Wait for the reply from our send or the timer's. |
| 690 | */ |
| 691 | if (!error || error == EPIPE || error == EWOULDBLOCK) |
| 692 | error = nfs_reply(rep, lwp); |
| 693 | |
| 694 | /* |
| 695 | * RPC done, unlink the request. |
| 696 | */ |
| 697 | s = splsoftnet(); |
| 698 | TAILQ_REMOVE(&nfs_reqq, rep, r_chain); |
| 699 | |
| 700 | /* |
| 701 | * Decrement the outstanding request count. |
| 702 | */ |
| 703 | if (rep->r_flags & R_SENT) { |
| 704 | rep->r_flags &= ~R_SENT; /* paranoia */ |
| 705 | nmp->nm_sent -= NFS_CWNDSCALE; |
| 706 | } |
| 707 | splx(s); |
| 708 | |
| 709 | if (rexmitp != NULL) { |
| 710 | int rexmit; |
| 711 | |
| 712 | if (nmp->nm_sotype != SOCK_DGRAM) |
| 713 | rexmit = (rep->r_flags & R_REXMITTED) != 0; |
| 714 | else |
| 715 | rexmit = rep->r_rexmit; |
| 716 | *rexmitp = rexmit; |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * If there was a successful reply and a tprintf msg. |
| 721 | * tprintf a response. |
| 722 | */ |
| 723 | if (!error && (rep->r_flags & R_TPRINTFMSG)) |
| 724 | nfs_msg(rep->r_lwp, nmp->nm_mountp->mnt_stat.f_mntfromname, |
| 725 | "is alive again" ); |
| 726 | mrep = rep->r_mrep; |
| 727 | md = rep->r_md; |
| 728 | dpos = rep->r_dpos; |
| 729 | if (error) |
| 730 | goto nfsmout; |
| 731 | |
| 732 | /* |
| 733 | * break down the rpc header and check if ok |
| 734 | */ |
| 735 | nfsm_dissect(tl, u_int32_t *, 3 * NFSX_UNSIGNED); |
| 736 | if (*tl++ == rpc_msgdenied) { |
| 737 | if (*tl == rpc_mismatch) |
| 738 | error = EOPNOTSUPP; |
| 739 | else if ((nmp->nm_flag & NFSMNT_KERB) && *tl++ == rpc_autherr) { |
| 740 | if (!failed_auth) { |
| 741 | failed_auth++; |
| 742 | mheadend->m_next = NULL; |
| 743 | m_freem(mrep); |
| 744 | m_freem(rep->r_mreq); |
| 745 | goto kerbauth; |
| 746 | } else |
| 747 | error = EAUTH; |
| 748 | } else |
| 749 | error = EACCES; |
| 750 | m_freem(mrep); |
| 751 | goto nfsmout; |
| 752 | } |
| 753 | |
| 754 | /* |
| 755 | * Grab any Kerberos verifier, otherwise just throw it away. |
| 756 | */ |
| 757 | verf_type = fxdr_unsigned(int, *tl++); |
| 758 | i = fxdr_unsigned(int32_t, *tl); |
| 759 | if ((nmp->nm_flag & NFSMNT_KERB) && verf_type == RPCAUTH_KERB4) { |
| 760 | error = nfs_savenickauth(nmp, cred, i, key, &md, &dpos, mrep); |
| 761 | if (error) |
| 762 | goto nfsmout; |
| 763 | } else if (i > 0) |
| 764 | nfsm_adv(nfsm_rndup(i)); |
| 765 | nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); |
| 766 | /* 0 == ok */ |
| 767 | if (*tl == 0) { |
| 768 | nfsm_dissect(tl, u_int32_t *, NFSX_UNSIGNED); |
| 769 | if (*tl != 0) { |
| 770 | error = fxdr_unsigned(int, *tl); |
| 771 | switch (error) { |
| 772 | case NFSERR_PERM: |
| 773 | error = EPERM; |
| 774 | break; |
| 775 | |
| 776 | case NFSERR_NOENT: |
| 777 | error = ENOENT; |
| 778 | break; |
| 779 | |
| 780 | case NFSERR_IO: |
| 781 | error = EIO; |
| 782 | break; |
| 783 | |
| 784 | case NFSERR_NXIO: |
| 785 | error = ENXIO; |
| 786 | break; |
| 787 | |
| 788 | case NFSERR_ACCES: |
| 789 | error = EACCES; |
| 790 | if (!retry_cred) |
| 791 | break; |
| 792 | m_freem(mrep); |
| 793 | m_freem(rep->r_mreq); |
| 794 | kmem_free(rep, sizeof(*rep)); |
| 795 | use_opencred = !use_opencred; |
| 796 | if (mrest_backup == NULL) { |
| 797 | /* m_copym failure */ |
| 798 | KASSERT( |
| 799 | kauth_cred_getrefcnt(acred) == 1); |
| 800 | kauth_cred_free(acred); |
| 801 | return ENOMEM; |
| 802 | } |
| 803 | mrest = mrest_backup; |
| 804 | mrest_backup = NULL; |
| 805 | cred = origcred; |
| 806 | error = 0; |
| 807 | retry_cred = false; |
| 808 | goto tryagain_cred; |
| 809 | |
| 810 | case NFSERR_EXIST: |
| 811 | error = EEXIST; |
| 812 | break; |
| 813 | |
| 814 | case NFSERR_XDEV: |
| 815 | error = EXDEV; |
| 816 | break; |
| 817 | |
| 818 | case NFSERR_NODEV: |
| 819 | error = ENODEV; |
| 820 | break; |
| 821 | |
| 822 | case NFSERR_NOTDIR: |
| 823 | error = ENOTDIR; |
| 824 | break; |
| 825 | |
| 826 | case NFSERR_ISDIR: |
| 827 | error = EISDIR; |
| 828 | break; |
| 829 | |
| 830 | case NFSERR_INVAL: |
| 831 | error = EINVAL; |
| 832 | break; |
| 833 | |
| 834 | case NFSERR_FBIG: |
| 835 | error = EFBIG; |
| 836 | break; |
| 837 | |
| 838 | case NFSERR_NOSPC: |
| 839 | error = ENOSPC; |
| 840 | break; |
| 841 | |
| 842 | case NFSERR_ROFS: |
| 843 | error = EROFS; |
| 844 | break; |
| 845 | |
| 846 | case NFSERR_MLINK: |
| 847 | error = EMLINK; |
| 848 | break; |
| 849 | |
| 850 | case NFSERR_TIMEDOUT: |
| 851 | error = ETIMEDOUT; |
| 852 | break; |
| 853 | |
| 854 | case NFSERR_NAMETOL: |
| 855 | error = ENAMETOOLONG; |
| 856 | break; |
| 857 | |
| 858 | case NFSERR_NOTEMPTY: |
| 859 | error = ENOTEMPTY; |
| 860 | break; |
| 861 | |
| 862 | case NFSERR_DQUOT: |
| 863 | error = EDQUOT; |
| 864 | break; |
| 865 | |
| 866 | case NFSERR_STALE: |
| 867 | /* |
| 868 | * If the File Handle was stale, invalidate the |
| 869 | * lookup cache, just in case. |
| 870 | */ |
| 871 | error = ESTALE; |
| 872 | cache_purge(NFSTOV(np)); |
| 873 | break; |
| 874 | |
| 875 | case NFSERR_REMOTE: |
| 876 | error = EREMOTE; |
| 877 | break; |
| 878 | |
| 879 | case NFSERR_WFLUSH: |
| 880 | case NFSERR_BADHANDLE: |
| 881 | case NFSERR_NOT_SYNC: |
| 882 | case NFSERR_BAD_COOKIE: |
| 883 | error = EINVAL; |
| 884 | break; |
| 885 | |
| 886 | case NFSERR_NOTSUPP: |
| 887 | error = ENOTSUP; |
| 888 | break; |
| 889 | |
| 890 | case NFSERR_TOOSMALL: |
| 891 | case NFSERR_SERVERFAULT: |
| 892 | case NFSERR_BADTYPE: |
| 893 | error = EINVAL; |
| 894 | break; |
| 895 | |
| 896 | case NFSERR_TRYLATER: |
| 897 | if ((nmp->nm_flag & NFSMNT_NFSV3) == 0) |
| 898 | break; |
| 899 | m_freem(mrep); |
| 900 | error = 0; |
| 901 | waituntil = time_second + trylater_delay; |
| 902 | while (time_second < waituntil) { |
| 903 | kpause("nfstrylater" , false, hz, NULL); |
| 904 | } |
| 905 | trylater_delay *= NFS_TRYLATERDELMUL; |
| 906 | if (trylater_delay > NFS_TRYLATERDELMAX) |
| 907 | trylater_delay = NFS_TRYLATERDELMAX; |
| 908 | /* |
| 909 | * RFC1813: |
| 910 | * The client should wait and then try |
| 911 | * the request with a new RPC transaction ID. |
| 912 | */ |
| 913 | nfs_renewxid(rep); |
| 914 | goto tryagain; |
| 915 | |
| 916 | default: |
| 917 | #ifdef DIAGNOSTIC |
| 918 | printf("Invalid rpc error code %d\n" , error); |
| 919 | #endif |
| 920 | error = EINVAL; |
| 921 | break; |
| 922 | } |
| 923 | |
| 924 | if (nmp->nm_flag & NFSMNT_NFSV3) { |
| 925 | *mrp = mrep; |
| 926 | *mdp = md; |
| 927 | *dposp = dpos; |
| 928 | error |= NFSERR_RETERR; |
| 929 | } else |
| 930 | m_freem(mrep); |
| 931 | goto nfsmout; |
| 932 | } |
| 933 | |
| 934 | /* |
| 935 | * note which credential worked to minimize number of retries. |
| 936 | */ |
| 937 | if (use_opencred) |
| 938 | np->n_flag |= NUSEOPENCRED; |
| 939 | else |
| 940 | np->n_flag &= ~NUSEOPENCRED; |
| 941 | |
| 942 | *mrp = mrep; |
| 943 | *mdp = md; |
| 944 | *dposp = dpos; |
| 945 | |
| 946 | KASSERT(error == 0); |
| 947 | goto nfsmout; |
| 948 | } |
| 949 | m_freem(mrep); |
| 950 | error = EPROTONOSUPPORT; |
| 951 | nfsmout: |
| 952 | KASSERT(kauth_cred_getrefcnt(acred) == 1); |
| 953 | kauth_cred_free(acred); |
| 954 | m_freem(rep->r_mreq); |
| 955 | kmem_free(rep, sizeof(*rep)); |
| 956 | m_freem(mrest_backup); |
| 957 | return (error); |
| 958 | } |
| 959 | |
| 960 | /* |
| 961 | * Lock a socket against others. |
| 962 | * Necessary for STREAM sockets to ensure you get an entire rpc request/reply |
| 963 | * and also to avoid race conditions between the processes with nfs requests |
| 964 | * in progress when a reconnect is necessary. |
| 965 | */ |
| 966 | static int |
| 967 | nfs_sndlock(struct nfsmount *nmp, struct nfsreq *rep) |
| 968 | { |
| 969 | struct lwp *l; |
| 970 | int timeo = 0; |
| 971 | bool catch_p = false; |
| 972 | int error = 0; |
| 973 | |
| 974 | if (nmp->nm_flag & NFSMNT_SOFT) |
| 975 | timeo = nmp->nm_retry * nmp->nm_timeo; |
| 976 | |
| 977 | if (nmp->nm_iflag & NFSMNT_DISMNTFORCE) |
| 978 | timeo = hz; |
| 979 | |
| 980 | if (rep) { |
| 981 | l = rep->r_lwp; |
| 982 | if (rep->r_nmp->nm_flag & NFSMNT_INT) |
| 983 | catch_p = true; |
| 984 | } else |
| 985 | l = NULL; |
| 986 | mutex_enter(&nmp->nm_lock); |
| 987 | while ((nmp->nm_iflag & NFSMNT_SNDLOCK) != 0) { |
| 988 | if (rep && nfs_sigintr(rep->r_nmp, rep, l)) { |
| 989 | error = EINTR; |
| 990 | goto quit; |
| 991 | } |
| 992 | if (catch_p) { |
| 993 | error = cv_timedwait_sig(&nmp->nm_sndcv, |
| 994 | &nmp->nm_lock, timeo); |
| 995 | } else { |
| 996 | error = cv_timedwait(&nmp->nm_sndcv, |
| 997 | &nmp->nm_lock, timeo); |
| 998 | } |
| 999 | |
| 1000 | if (error) { |
| 1001 | if ((error == EWOULDBLOCK) && |
| 1002 | (nmp->nm_flag & NFSMNT_SOFT)) { |
| 1003 | error = EIO; |
| 1004 | goto quit; |
| 1005 | } |
| 1006 | error = 0; |
| 1007 | } |
| 1008 | if (catch_p) { |
| 1009 | catch_p = false; |
| 1010 | timeo = 2 * hz; |
| 1011 | } |
| 1012 | } |
| 1013 | nmp->nm_iflag |= NFSMNT_SNDLOCK; |
| 1014 | quit: |
| 1015 | mutex_exit(&nmp->nm_lock); |
| 1016 | return error; |
| 1017 | } |
| 1018 | |
| 1019 | /* |
| 1020 | * Unlock the stream socket for others. |
| 1021 | */ |
| 1022 | static void |
| 1023 | nfs_sndunlock(struct nfsmount *nmp) |
| 1024 | { |
| 1025 | |
| 1026 | mutex_enter(&nmp->nm_lock); |
| 1027 | if ((nmp->nm_iflag & NFSMNT_SNDLOCK) == 0) |
| 1028 | panic("nfs sndunlock" ); |
| 1029 | nmp->nm_iflag &= ~NFSMNT_SNDLOCK; |
| 1030 | cv_signal(&nmp->nm_sndcv); |
| 1031 | mutex_exit(&nmp->nm_lock); |
| 1032 | } |
| 1033 | |