| 1 | /* $NetBSD: nfs_syscalls.c,v 1.157 2016/06/10 13:27:16 ozaki-r 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_syscalls.c,v 1.157 2016/06/10 13:27:16 ozaki-r 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 int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *, |
| 79 | struct nfssvc_sock *, |
| 80 | struct lwp *, struct mbuf **); |
| 81 | extern int nfsrvw_procrastinate; |
| 82 | extern int nuidhash_max; |
| 83 | |
| 84 | static int nfs_numnfsd = 0; |
| 85 | static struct nfsdrt nfsdrt; |
| 86 | kmutex_t nfsd_lock; |
| 87 | struct nfssvc_sockhead nfssvc_sockhead; |
| 88 | kcondvar_t nfsd_initcv; |
| 89 | struct nfssvc_sockhead nfssvc_sockpending; |
| 90 | struct nfsdhead nfsd_head; |
| 91 | struct nfsdidlehead nfsd_idle_head; |
| 92 | |
| 93 | int nfssvc_sockhead_flag; |
| 94 | int nfsd_head_flag; |
| 95 | |
| 96 | struct nfssvc_sock *nfs_udpsock; |
| 97 | struct nfssvc_sock *nfs_udp6sock; |
| 98 | |
| 99 | static struct nfssvc_sock *nfsrv_sockalloc(void); |
| 100 | static void nfsrv_sockfree(struct nfssvc_sock *); |
| 101 | static void nfsd_rt(int, struct nfsrv_descript *, int); |
| 102 | static int nfssvc_nfsd(struct nfssvc_copy_ops *, struct nfsd_srvargs *, void *, |
| 103 | struct lwp *); |
| 104 | |
| 105 | static int nfssvc_addsock_in(struct nfsd_args *, const void *); |
| 106 | static int nfssvc_setexports_in(struct mountd_exports_list *, const void *); |
| 107 | static int nfssvc_nsd_in(struct nfsd_srvargs *, const void *); |
| 108 | static int nfssvc_nsd_out(void *, const struct nfsd_srvargs *); |
| 109 | static int nfssvc_exp_in(struct export_args *, const void *, size_t); |
| 110 | |
| 111 | static int |
| 112 | nfssvc_addsock_in(struct nfsd_args *nfsdarg, const void *argp) |
| 113 | { |
| 114 | |
| 115 | return copyin(argp, nfsdarg, sizeof *nfsdarg); |
| 116 | } |
| 117 | |
| 118 | static int |
| 119 | nfssvc_setexports_in(struct mountd_exports_list *mel, const void *argp) |
| 120 | { |
| 121 | |
| 122 | return copyin(argp, mel, sizeof *mel); |
| 123 | } |
| 124 | |
| 125 | static int |
| 126 | nfssvc_nsd_in(struct nfsd_srvargs *nsd, const void *argp) |
| 127 | { |
| 128 | |
| 129 | return copyin(argp, nsd, sizeof *nsd); |
| 130 | } |
| 131 | |
| 132 | static int |
| 133 | nfssvc_nsd_out(void *argp, const struct nfsd_srvargs *nsd) |
| 134 | { |
| 135 | |
| 136 | return copyout(nsd, argp, sizeof *nsd); |
| 137 | } |
| 138 | |
| 139 | static int |
| 140 | nfssvc_exp_in(struct export_args *exp, const void *argp, size_t nexports) |
| 141 | { |
| 142 | |
| 143 | return copyin(argp, exp, sizeof(*exp) * nexports); |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * NFS server system calls |
| 148 | */ |
| 149 | |
| 150 | static struct nfssvc_copy_ops native_ops = { |
| 151 | .addsock_in = nfssvc_addsock_in, |
| 152 | .setexports_in = nfssvc_setexports_in, |
| 153 | .nsd_in = nfssvc_nsd_in, |
| 154 | .nsd_out = nfssvc_nsd_out, |
| 155 | .exp_in = nfssvc_exp_in, |
| 156 | }; |
| 157 | |
| 158 | /* |
| 159 | * Nfs server pseudo system call for the nfsd's |
| 160 | * Based on the flag value it either: |
| 161 | * - adds a socket to the selection list |
| 162 | * - remains in the kernel as an nfsd |
| 163 | * - remains in the kernel as an nfsiod |
| 164 | */ |
| 165 | |
| 166 | int |
| 167 | sys_nfssvc(struct lwp *l, const struct sys_nfssvc_args *uap, register_t *retval) |
| 168 | { |
| 169 | /* { |
| 170 | syscallarg(int) flag; |
| 171 | syscallarg(void *) argp; |
| 172 | } */ |
| 173 | int flag = SCARG(uap, flag); |
| 174 | void *argp = SCARG(uap, argp); |
| 175 | |
| 176 | return do_nfssvc(&native_ops, l, flag, argp, retval); |
| 177 | } |
| 178 | |
| 179 | int |
| 180 | do_nfssvc(struct nfssvc_copy_ops *ops, struct lwp *l, int flag, void *argp, register_t *retval) |
| 181 | { |
| 182 | int error; |
| 183 | file_t *fp; |
| 184 | struct mbuf *nam; |
| 185 | struct nfsd_args nfsdarg; |
| 186 | struct nfsd_srvargs nfsd_srvargs, *nsd = &nfsd_srvargs; |
| 187 | struct nfsd *nfsd; |
| 188 | struct nfssvc_sock *slp; |
| 189 | struct nfsuid *nuidp; |
| 190 | |
| 191 | error = kauth_authorize_network(l->l_cred, KAUTH_NETWORK_NFS, |
| 192 | KAUTH_REQ_NETWORK_NFS_SVC, NULL, NULL, NULL); |
| 193 | if (error) |
| 194 | return (error); |
| 195 | |
| 196 | mutex_enter(&nfsd_lock); |
| 197 | while (nfssvc_sockhead_flag & SLP_INIT) { |
| 198 | cv_wait(&nfsd_initcv, &nfsd_lock); |
| 199 | } |
| 200 | mutex_exit(&nfsd_lock); |
| 201 | |
| 202 | if (flag & NFSSVC_BIOD) { |
| 203 | /* Dummy implementation of nfsios for 1.4 and earlier. */ |
| 204 | error = kpause("nfsbiod" , true, 0, NULL); |
| 205 | } else if (flag & NFSSVC_MNTD) { |
| 206 | error = ENOSYS; |
| 207 | } else if (flag & NFSSVC_ADDSOCK) { |
| 208 | error = ops->addsock_in(&nfsdarg, argp); |
| 209 | if (error) |
| 210 | return (error); |
| 211 | /* getsock() will use the descriptor for us */ |
| 212 | if ((fp = fd_getfile(nfsdarg.sock)) == NULL) |
| 213 | return (EBADF); |
| 214 | if (fp->f_type != DTYPE_SOCKET) { |
| 215 | fd_putfile(nfsdarg.sock); |
| 216 | return (ENOTSOCK); |
| 217 | } |
| 218 | /* |
| 219 | * Get the client address for connected sockets. |
| 220 | */ |
| 221 | if (nfsdarg.name == NULL || nfsdarg.namelen == 0) |
| 222 | nam = (struct mbuf *)0; |
| 223 | else { |
| 224 | error = sockargs(&nam, nfsdarg.name, nfsdarg.namelen, |
| 225 | MT_SONAME); |
| 226 | if (error) { |
| 227 | fd_putfile(nfsdarg.sock); |
| 228 | return (error); |
| 229 | } |
| 230 | } |
| 231 | error = nfssvc_addsock(fp, nam); |
| 232 | fd_putfile(nfsdarg.sock); |
| 233 | } else if (flag & NFSSVC_SETEXPORTSLIST) { |
| 234 | struct export_args *args; |
| 235 | struct mountd_exports_list mel; |
| 236 | |
| 237 | error = ops->setexports_in(&mel, argp); |
| 238 | if (error != 0) |
| 239 | return error; |
| 240 | |
| 241 | args = (struct export_args *)malloc(mel.mel_nexports * |
| 242 | sizeof(struct export_args), M_TEMP, M_WAITOK); |
| 243 | error = ops->exp_in(args, mel.mel_exports, mel.mel_nexports); |
| 244 | if (error != 0) { |
| 245 | free(args, M_TEMP); |
| 246 | return error; |
| 247 | } |
| 248 | mel.mel_exports = args; |
| 249 | |
| 250 | error = mountd_set_exports_list(&mel, l, NULL); |
| 251 | |
| 252 | free(args, M_TEMP); |
| 253 | } else { |
| 254 | error = ops->nsd_in(nsd, argp); |
| 255 | if (error) |
| 256 | return (error); |
| 257 | if ((flag & NFSSVC_AUTHIN) && |
| 258 | ((nfsd = nsd->nsd_nfsd)) != NULL && |
| 259 | (nfsd->nfsd_slp->ns_flags & SLP_VALID)) { |
| 260 | slp = nfsd->nfsd_slp; |
| 261 | |
| 262 | /* |
| 263 | * First check to see if another nfsd has already |
| 264 | * added this credential. |
| 265 | */ |
| 266 | LIST_FOREACH(nuidp, NUIDHASH(slp, nsd->nsd_cr.cr_uid), |
| 267 | nu_hash) { |
| 268 | if (kauth_cred_geteuid(nuidp->nu_cr) == |
| 269 | nsd->nsd_cr.cr_uid && |
| 270 | (!nfsd->nfsd_nd->nd_nam2 || |
| 271 | netaddr_match(NU_NETFAM(nuidp), |
| 272 | &nuidp->nu_haddr, nfsd->nfsd_nd->nd_nam2))) |
| 273 | break; |
| 274 | } |
| 275 | if (nuidp) { |
| 276 | kauth_cred_hold(nuidp->nu_cr); |
| 277 | nfsd->nfsd_nd->nd_cr = nuidp->nu_cr; |
| 278 | nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; |
| 279 | } else { |
| 280 | /* |
| 281 | * Nope, so we will. |
| 282 | */ |
| 283 | if (slp->ns_numuids < nuidhash_max) { |
| 284 | slp->ns_numuids++; |
| 285 | nuidp = kmem_alloc(sizeof(*nuidp), KM_SLEEP); |
| 286 | } else |
| 287 | nuidp = (struct nfsuid *)0; |
| 288 | if ((slp->ns_flags & SLP_VALID) == 0) { |
| 289 | if (nuidp) |
| 290 | kmem_free(nuidp, sizeof(*nuidp)); |
| 291 | } else { |
| 292 | if (nuidp == (struct nfsuid *)0) { |
| 293 | nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); |
| 294 | LIST_REMOVE(nuidp, nu_hash); |
| 295 | TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, |
| 296 | nu_lru); |
| 297 | if (nuidp->nu_flag & NU_NAM) |
| 298 | m_freem(nuidp->nu_nam); |
| 299 | } |
| 300 | nuidp->nu_flag = 0; |
| 301 | kauth_uucred_to_cred(nuidp->nu_cr, |
| 302 | &nsd->nsd_cr); |
| 303 | nuidp->nu_timestamp = nsd->nsd_timestamp; |
| 304 | nuidp->nu_expire = time_second + nsd->nsd_ttl; |
| 305 | /* |
| 306 | * and save the session key in nu_key. |
| 307 | */ |
| 308 | memcpy(nuidp->nu_key, nsd->nsd_key, |
| 309 | sizeof(nsd->nsd_key)); |
| 310 | if (nfsd->nfsd_nd->nd_nam2) { |
| 311 | struct sockaddr_in *saddr; |
| 312 | |
| 313 | saddr = mtod(nfsd->nfsd_nd->nd_nam2, |
| 314 | struct sockaddr_in *); |
| 315 | switch (saddr->sin_family) { |
| 316 | case AF_INET: |
| 317 | nuidp->nu_flag |= NU_INETADDR; |
| 318 | nuidp->nu_inetaddr = |
| 319 | saddr->sin_addr.s_addr; |
| 320 | break; |
| 321 | case AF_INET6: |
| 322 | nuidp->nu_flag |= NU_NAM; |
| 323 | nuidp->nu_nam = m_copym( |
| 324 | nfsd->nfsd_nd->nd_nam2, 0, |
| 325 | M_COPYALL, M_WAIT); |
| 326 | break; |
| 327 | default: |
| 328 | return EAFNOSUPPORT; |
| 329 | }; |
| 330 | } |
| 331 | TAILQ_INSERT_TAIL(&slp->ns_uidlruhead, nuidp, |
| 332 | nu_lru); |
| 333 | LIST_INSERT_HEAD(NUIDHASH(slp, nsd->nsd_uid), |
| 334 | nuidp, nu_hash); |
| 335 | kauth_cred_hold(nuidp->nu_cr); |
| 336 | nfsd->nfsd_nd->nd_cr = nuidp->nu_cr; |
| 337 | nfsd->nfsd_nd->nd_flag |= ND_KERBFULL; |
| 338 | } |
| 339 | } |
| 340 | } |
| 341 | if ((flag & NFSSVC_AUTHINFAIL) && |
| 342 | (nfsd = nsd->nsd_nfsd)) |
| 343 | nfsd->nfsd_flag |= NFSD_AUTHFAIL; |
| 344 | error = nfssvc_nfsd(ops, nsd, argp, l); |
| 345 | } |
| 346 | if (error == EINTR || error == ERESTART) |
| 347 | error = 0; |
| 348 | return (error); |
| 349 | } |
| 350 | |
| 351 | static struct nfssvc_sock * |
| 352 | nfsrv_sockalloc(void) |
| 353 | { |
| 354 | struct nfssvc_sock *slp; |
| 355 | |
| 356 | slp = kmem_alloc(sizeof(*slp), KM_SLEEP); |
| 357 | memset(slp, 0, sizeof (struct nfssvc_sock)); |
| 358 | mutex_init(&slp->ns_lock, MUTEX_DRIVER, IPL_SOFTNET); |
| 359 | mutex_init(&slp->ns_alock, MUTEX_DRIVER, IPL_SOFTNET); |
| 360 | cv_init(&slp->ns_cv, "nfsdsock" ); |
| 361 | TAILQ_INIT(&slp->ns_uidlruhead); |
| 362 | LIST_INIT(&slp->ns_tq); |
| 363 | SIMPLEQ_INIT(&slp->ns_sendq); |
| 364 | mutex_enter(&nfsd_lock); |
| 365 | TAILQ_INSERT_TAIL(&nfssvc_sockhead, slp, ns_chain); |
| 366 | mutex_exit(&nfsd_lock); |
| 367 | |
| 368 | return slp; |
| 369 | } |
| 370 | |
| 371 | static void |
| 372 | nfsrv_sockfree(struct nfssvc_sock *slp) |
| 373 | { |
| 374 | |
| 375 | KASSERT(slp->ns_so == NULL); |
| 376 | KASSERT(slp->ns_fp == NULL); |
| 377 | KASSERT((slp->ns_flags & SLP_VALID) == 0); |
| 378 | mutex_destroy(&slp->ns_lock); |
| 379 | mutex_destroy(&slp->ns_alock); |
| 380 | cv_destroy(&slp->ns_cv); |
| 381 | kmem_free(slp, sizeof(*slp)); |
| 382 | } |
| 383 | |
| 384 | /* |
| 385 | * Adds a socket to the list for servicing by nfsds. |
| 386 | */ |
| 387 | int |
| 388 | nfssvc_addsock(file_t *fp, struct mbuf *mynam) |
| 389 | { |
| 390 | int siz; |
| 391 | struct nfssvc_sock *slp; |
| 392 | struct socket *so; |
| 393 | struct nfssvc_sock *tslp; |
| 394 | int error; |
| 395 | int val; |
| 396 | |
| 397 | so = fp->f_socket; |
| 398 | tslp = (struct nfssvc_sock *)0; |
| 399 | /* |
| 400 | * Add it to the list, as required. |
| 401 | */ |
| 402 | if (so->so_proto->pr_protocol == IPPROTO_UDP) { |
| 403 | if (so->so_proto->pr_domain->dom_family == AF_INET6) |
| 404 | tslp = nfs_udp6sock; |
| 405 | else { |
| 406 | tslp = nfs_udpsock; |
| 407 | if (tslp->ns_flags & SLP_VALID) { |
| 408 | m_freem(mynam); |
| 409 | return (EPERM); |
| 410 | } |
| 411 | } |
| 412 | } |
| 413 | if (so->so_type == SOCK_STREAM) |
| 414 | siz = NFS_MAXPACKET + sizeof (u_long); |
| 415 | else |
| 416 | siz = NFS_MAXPACKET; |
| 417 | solock(so); |
| 418 | error = soreserve(so, siz, siz); |
| 419 | sounlock(so); |
| 420 | if (error) { |
| 421 | m_freem(mynam); |
| 422 | return (error); |
| 423 | } |
| 424 | |
| 425 | /* |
| 426 | * Set protocol specific options { for now TCP only } and |
| 427 | * reserve some space. For datagram sockets, this can get called |
| 428 | * repeatedly for the same socket, but that isn't harmful. |
| 429 | */ |
| 430 | if (so->so_type == SOCK_STREAM) { |
| 431 | val = 1; |
| 432 | so_setsockopt(NULL, so, SOL_SOCKET, SO_KEEPALIVE, &val, |
| 433 | sizeof(val)); |
| 434 | } |
| 435 | if ((so->so_proto->pr_domain->dom_family == AF_INET || |
| 436 | so->so_proto->pr_domain->dom_family == AF_INET6) && |
| 437 | so->so_proto->pr_protocol == IPPROTO_TCP) { |
| 438 | val = 1; |
| 439 | so_setsockopt(NULL, so, IPPROTO_TCP, TCP_NODELAY, &val, |
| 440 | sizeof(val)); |
| 441 | } |
| 442 | solock(so); |
| 443 | so->so_rcv.sb_flags &= ~SB_NOINTR; |
| 444 | so->so_rcv.sb_timeo = 0; |
| 445 | so->so_snd.sb_flags &= ~SB_NOINTR; |
| 446 | so->so_snd.sb_timeo = 0; |
| 447 | sounlock(so); |
| 448 | if (tslp) { |
| 449 | slp = tslp; |
| 450 | } else { |
| 451 | slp = nfsrv_sockalloc(); |
| 452 | } |
| 453 | slp->ns_so = so; |
| 454 | slp->ns_nam = mynam; |
| 455 | mutex_enter(&fp->f_lock); |
| 456 | fp->f_count++; |
| 457 | mutex_exit(&fp->f_lock); |
| 458 | slp->ns_fp = fp; |
| 459 | slp->ns_flags = SLP_VALID; |
| 460 | slp->ns_aflags = SLP_A_NEEDQ; |
| 461 | slp->ns_gflags = 0; |
| 462 | slp->ns_sflags = 0; |
| 463 | solock(so); |
| 464 | so->so_upcallarg = (void *)slp; |
| 465 | so->so_upcall = nfsrv_soupcall; |
| 466 | so->so_rcv.sb_flags |= SB_UPCALL; |
| 467 | sounlock(so); |
| 468 | nfsrv_wakenfsd(slp); |
| 469 | return (0); |
| 470 | } |
| 471 | |
| 472 | /* |
| 473 | * Called by nfssvc() for nfsds. Just loops around servicing rpc requests |
| 474 | * until it is killed by a signal. |
| 475 | */ |
| 476 | static int |
| 477 | nfssvc_nfsd(struct nfssvc_copy_ops *ops, struct nfsd_srvargs *nsd, |
| 478 | void *argp, struct lwp *l) |
| 479 | { |
| 480 | struct timeval tv; |
| 481 | struct mbuf *m; |
| 482 | struct nfssvc_sock *slp; |
| 483 | struct nfsd *nfsd = nsd->nsd_nfsd; |
| 484 | struct nfsrv_descript *nd = NULL; |
| 485 | struct mbuf *mreq; |
| 486 | u_quad_t cur_usec; |
| 487 | int error = 0, cacherep, siz, sotype, writes_todo; |
| 488 | struct proc *p = l->l_proc; |
| 489 | bool doreinit; |
| 490 | |
| 491 | #ifndef nolint |
| 492 | cacherep = RC_DOIT; |
| 493 | writes_todo = 0; |
| 494 | #endif |
| 495 | if (nfsd == NULL) { |
| 496 | nsd->nsd_nfsd = nfsd = kmem_alloc(sizeof(*nfsd), KM_SLEEP); |
| 497 | memset(nfsd, 0, sizeof (struct nfsd)); |
| 498 | cv_init(&nfsd->nfsd_cv, "nfsd" ); |
| 499 | nfsd->nfsd_procp = p; |
| 500 | mutex_enter(&nfsd_lock); |
| 501 | while ((nfssvc_sockhead_flag & SLP_INIT) != 0) { |
| 502 | KASSERT(nfs_numnfsd == 0); |
| 503 | cv_wait(&nfsd_initcv, &nfsd_lock); |
| 504 | } |
| 505 | TAILQ_INSERT_TAIL(&nfsd_head, nfsd, nfsd_chain); |
| 506 | nfs_numnfsd++; |
| 507 | mutex_exit(&nfsd_lock); |
| 508 | } |
| 509 | /* |
| 510 | * Loop getting rpc requests until SIGKILL. |
| 511 | */ |
| 512 | for (;;) { |
| 513 | bool dummy; |
| 514 | |
| 515 | if ((curcpu()->ci_schedstate.spc_flags & SPCF_SHOULDYIELD) |
| 516 | != 0) { |
| 517 | preempt(); |
| 518 | } |
| 519 | if (nfsd->nfsd_slp == NULL) { |
| 520 | mutex_enter(&nfsd_lock); |
| 521 | while (nfsd->nfsd_slp == NULL && |
| 522 | (nfsd_head_flag & NFSD_CHECKSLP) == 0) { |
| 523 | SLIST_INSERT_HEAD(&nfsd_idle_head, nfsd, |
| 524 | nfsd_idle); |
| 525 | error = cv_wait_sig(&nfsd->nfsd_cv, &nfsd_lock); |
| 526 | if (error) { |
| 527 | slp = nfsd->nfsd_slp; |
| 528 | nfsd->nfsd_slp = NULL; |
| 529 | if (!slp) |
| 530 | SLIST_REMOVE(&nfsd_idle_head, |
| 531 | nfsd, nfsd, nfsd_idle); |
| 532 | mutex_exit(&nfsd_lock); |
| 533 | if (slp) { |
| 534 | nfsrv_wakenfsd(slp); |
| 535 | nfsrv_slpderef(slp); |
| 536 | } |
| 537 | goto done; |
| 538 | } |
| 539 | } |
| 540 | if (nfsd->nfsd_slp == NULL && |
| 541 | (nfsd_head_flag & NFSD_CHECKSLP) != 0) { |
| 542 | slp = TAILQ_FIRST(&nfssvc_sockpending); |
| 543 | if (slp) { |
| 544 | KASSERT((slp->ns_gflags & SLP_G_DOREC) |
| 545 | != 0); |
| 546 | TAILQ_REMOVE(&nfssvc_sockpending, slp, |
| 547 | ns_pending); |
| 548 | slp->ns_gflags &= ~SLP_G_DOREC; |
| 549 | slp->ns_sref++; |
| 550 | nfsd->nfsd_slp = slp; |
| 551 | } else |
| 552 | nfsd_head_flag &= ~NFSD_CHECKSLP; |
| 553 | } |
| 554 | KASSERT(nfsd->nfsd_slp == NULL || |
| 555 | nfsd->nfsd_slp->ns_sref > 0); |
| 556 | mutex_exit(&nfsd_lock); |
| 557 | if ((slp = nfsd->nfsd_slp) == NULL) |
| 558 | continue; |
| 559 | if (slp->ns_flags & SLP_VALID) { |
| 560 | bool more; |
| 561 | |
| 562 | if (nfsdsock_testbits(slp, SLP_A_NEEDQ)) { |
| 563 | nfsrv_rcv(slp); |
| 564 | } |
| 565 | if (nfsdsock_testbits(slp, SLP_A_DISCONN)) { |
| 566 | nfsrv_zapsock(slp); |
| 567 | } |
| 568 | error = nfsrv_dorec(slp, nfsd, &nd, &more); |
| 569 | getmicrotime(&tv); |
| 570 | cur_usec = (u_quad_t)tv.tv_sec * 1000000 + |
| 571 | (u_quad_t)tv.tv_usec; |
| 572 | writes_todo = 0; |
| 573 | if (error) { |
| 574 | struct nfsrv_descript *nd2; |
| 575 | |
| 576 | mutex_enter(&nfsd_lock); |
| 577 | nd2 = LIST_FIRST(&slp->ns_tq); |
| 578 | if (nd2 != NULL && |
| 579 | nd2->nd_time <= cur_usec) { |
| 580 | error = 0; |
| 581 | cacherep = RC_DOIT; |
| 582 | writes_todo = 1; |
| 583 | } |
| 584 | mutex_exit(&nfsd_lock); |
| 585 | } |
| 586 | if (error == 0 && more) { |
| 587 | nfsrv_wakenfsd(slp); |
| 588 | } |
| 589 | } |
| 590 | } else { |
| 591 | error = 0; |
| 592 | slp = nfsd->nfsd_slp; |
| 593 | } |
| 594 | KASSERT(slp != NULL); |
| 595 | KASSERT(nfsd->nfsd_slp == slp); |
| 596 | if (error || (slp->ns_flags & SLP_VALID) == 0) { |
| 597 | if (nd) { |
| 598 | nfsdreq_free(nd); |
| 599 | nd = NULL; |
| 600 | } |
| 601 | nfsd->nfsd_slp = NULL; |
| 602 | nfsrv_slpderef(slp); |
| 603 | continue; |
| 604 | } |
| 605 | sotype = slp->ns_so->so_type; |
| 606 | if (nd) { |
| 607 | getmicrotime(&nd->nd_starttime); |
| 608 | if (nd->nd_nam2) |
| 609 | nd->nd_nam = nd->nd_nam2; |
| 610 | else |
| 611 | nd->nd_nam = slp->ns_nam; |
| 612 | |
| 613 | /* |
| 614 | * Check to see if authorization is needed. |
| 615 | */ |
| 616 | if (nfsd->nfsd_flag & NFSD_NEEDAUTH) { |
| 617 | nfsd->nfsd_flag &= ~NFSD_NEEDAUTH; |
| 618 | nsd->nsd_haddr = mtod(nd->nd_nam, |
| 619 | struct sockaddr_in *)->sin_addr.s_addr; |
| 620 | nsd->nsd_authlen = nfsd->nfsd_authlen; |
| 621 | nsd->nsd_verflen = nfsd->nfsd_verflen; |
| 622 | if (!copyout(nfsd->nfsd_authstr, |
| 623 | nsd->nsd_authstr, nfsd->nfsd_authlen) && |
| 624 | !copyout(nfsd->nfsd_verfstr, |
| 625 | nsd->nsd_verfstr, nfsd->nfsd_verflen) && |
| 626 | !ops->nsd_out(argp, nsd)) { |
| 627 | return (ENEEDAUTH); |
| 628 | } |
| 629 | cacherep = RC_DROPIT; |
| 630 | } else |
| 631 | cacherep = nfsrv_getcache(nd, slp, &mreq); |
| 632 | |
| 633 | if (nfsd->nfsd_flag & NFSD_AUTHFAIL) { |
| 634 | nfsd->nfsd_flag &= ~NFSD_AUTHFAIL; |
| 635 | nd->nd_procnum = NFSPROC_NOOP; |
| 636 | nd->nd_repstat = |
| 637 | (NFSERR_AUTHERR | AUTH_TOOWEAK); |
| 638 | cacherep = RC_DOIT; |
| 639 | } |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Loop to get all the write rpc relies that have been |
| 644 | * gathered together. |
| 645 | */ |
| 646 | do { |
| 647 | switch (cacherep) { |
| 648 | case RC_DOIT: |
| 649 | mreq = NULL; |
| 650 | netexport_rdlock(); |
| 651 | if (writes_todo || nd == NULL || |
| 652 | (!(nd->nd_flag & ND_NFSV3) && |
| 653 | nd->nd_procnum == NFSPROC_WRITE && |
| 654 | nfsrvw_procrastinate > 0)) |
| 655 | error = nfsrv_writegather(&nd, slp, |
| 656 | l, &mreq); |
| 657 | else |
| 658 | error = |
| 659 | (*(nfsrv3_procs[nd->nd_procnum])) |
| 660 | (nd, slp, l, &mreq); |
| 661 | netexport_rdunlock(); |
| 662 | if (mreq == NULL) { |
| 663 | if (nd != NULL) { |
| 664 | if (nd->nd_nam2) |
| 665 | m_free(nd->nd_nam2); |
| 666 | } |
| 667 | break; |
| 668 | } |
| 669 | if (error) { |
| 670 | nfsstats.srv_errs++; |
| 671 | if (nd) { |
| 672 | nfsrv_updatecache(nd, false, |
| 673 | mreq); |
| 674 | if (nd->nd_nam2) |
| 675 | m_freem(nd->nd_nam2); |
| 676 | } |
| 677 | break; |
| 678 | } |
| 679 | if (nd) { |
| 680 | nfsstats.srvrpccnt[nd->nd_procnum]++; |
| 681 | nfsrv_updatecache(nd, true, mreq); |
| 682 | nd->nd_mrep = NULL; |
| 683 | } |
| 684 | case RC_REPLY: |
| 685 | m = mreq; |
| 686 | siz = 0; |
| 687 | while (m) { |
| 688 | siz += m->m_len; |
| 689 | m = m->m_next; |
| 690 | } |
| 691 | if (siz <= 0 || siz > NFS_MAXPACKET) { |
| 692 | printf("mbuf siz=%d\n" ,siz); |
| 693 | panic("Bad nfs svc reply" ); |
| 694 | } |
| 695 | m = mreq; |
| 696 | m->m_pkthdr.len = siz; |
| 697 | m_reset_rcvif(m); |
| 698 | /* |
| 699 | * For stream protocols, prepend a Sun RPC |
| 700 | * Record Mark. |
| 701 | */ |
| 702 | if (sotype == SOCK_STREAM) { |
| 703 | M_PREPEND(m, NFSX_UNSIGNED, M_WAIT); |
| 704 | *mtod(m, u_int32_t *) = |
| 705 | htonl(0x80000000 | siz); |
| 706 | } |
| 707 | if (nd) { |
| 708 | nd->nd_mreq = m; |
| 709 | if (nfsrtton) { |
| 710 | nfsd_rt(slp->ns_so->so_type, nd, |
| 711 | cacherep); |
| 712 | } |
| 713 | error = nfsdsock_sendreply(slp, nd); |
| 714 | nd = NULL; |
| 715 | } |
| 716 | if (error == EPIPE) |
| 717 | nfsrv_zapsock(slp); |
| 718 | if (error == EINTR || error == ERESTART) { |
| 719 | nfsd->nfsd_slp = NULL; |
| 720 | nfsrv_slpderef(slp); |
| 721 | goto done; |
| 722 | } |
| 723 | break; |
| 724 | case RC_DROPIT: |
| 725 | if (nd) { |
| 726 | if (nfsrtton) |
| 727 | nfsd_rt(sotype, nd, cacherep); |
| 728 | m_freem(nd->nd_mrep); |
| 729 | m_freem(nd->nd_nam2); |
| 730 | } |
| 731 | break; |
| 732 | } |
| 733 | if (nd) { |
| 734 | nfsdreq_free(nd); |
| 735 | nd = NULL; |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * Check to see if there are outstanding writes that |
| 740 | * need to be serviced. |
| 741 | */ |
| 742 | getmicrotime(&tv); |
| 743 | cur_usec = (u_quad_t)tv.tv_sec * 1000000 + |
| 744 | (u_quad_t)tv.tv_usec; |
| 745 | mutex_enter(&nfsd_lock); |
| 746 | if (LIST_FIRST(&slp->ns_tq) && |
| 747 | LIST_FIRST(&slp->ns_tq)->nd_time <= cur_usec) { |
| 748 | cacherep = RC_DOIT; |
| 749 | writes_todo = 1; |
| 750 | } else |
| 751 | writes_todo = 0; |
| 752 | mutex_exit(&nfsd_lock); |
| 753 | } while (writes_todo); |
| 754 | if (nfsrv_dorec(slp, nfsd, &nd, &dummy)) { |
| 755 | nfsd->nfsd_slp = NULL; |
| 756 | nfsrv_slpderef(slp); |
| 757 | } |
| 758 | } |
| 759 | done: |
| 760 | mutex_enter(&nfsd_lock); |
| 761 | TAILQ_REMOVE(&nfsd_head, nfsd, nfsd_chain); |
| 762 | doreinit = --nfs_numnfsd == 0; |
| 763 | if (doreinit) |
| 764 | nfssvc_sockhead_flag |= SLP_INIT; |
| 765 | mutex_exit(&nfsd_lock); |
| 766 | cv_destroy(&nfsd->nfsd_cv); |
| 767 | kmem_free(nfsd, sizeof(*nfsd)); |
| 768 | nsd->nsd_nfsd = NULL; |
| 769 | if (doreinit) |
| 770 | nfsrv_init(true); /* Reinitialize everything */ |
| 771 | return (error); |
| 772 | } |
| 773 | |
| 774 | /* |
| 775 | * Shut down a socket associated with an nfssvc_sock structure. |
| 776 | * Should be called with the send lock set, if required. |
| 777 | * The trick here is to increment the sref at the start, so that the nfsds |
| 778 | * will stop using it and clear ns_flag at the end so that it will not be |
| 779 | * reassigned during cleanup. |
| 780 | * |
| 781 | * called at splsoftnet. |
| 782 | */ |
| 783 | void |
| 784 | nfsrv_zapsock(struct nfssvc_sock *slp) |
| 785 | { |
| 786 | struct nfsuid *nuidp, *nnuidp; |
| 787 | struct nfsrv_descript *nwp; |
| 788 | struct socket *so; |
| 789 | struct mbuf *m; |
| 790 | |
| 791 | if (nfsdsock_drain(slp)) { |
| 792 | return; |
| 793 | } |
| 794 | mutex_enter(&nfsd_lock); |
| 795 | if (slp->ns_gflags & SLP_G_DOREC) { |
| 796 | TAILQ_REMOVE(&nfssvc_sockpending, slp, ns_pending); |
| 797 | slp->ns_gflags &= ~SLP_G_DOREC; |
| 798 | } |
| 799 | mutex_exit(&nfsd_lock); |
| 800 | |
| 801 | so = slp->ns_so; |
| 802 | KASSERT(so != NULL); |
| 803 | solock(so); |
| 804 | so->so_upcall = NULL; |
| 805 | so->so_upcallarg = NULL; |
| 806 | so->so_rcv.sb_flags &= ~SB_UPCALL; |
| 807 | soshutdown(so, SHUT_RDWR); |
| 808 | sounlock(so); |
| 809 | |
| 810 | m_freem(slp->ns_raw); |
| 811 | m = slp->ns_rec; |
| 812 | while (m != NULL) { |
| 813 | struct mbuf *n; |
| 814 | |
| 815 | n = m->m_nextpkt; |
| 816 | m_freem(m); |
| 817 | m = n; |
| 818 | } |
| 819 | /* XXX what about freeing ns_frag ? */ |
| 820 | for (nuidp = TAILQ_FIRST(&slp->ns_uidlruhead); nuidp != 0; |
| 821 | nuidp = nnuidp) { |
| 822 | nnuidp = TAILQ_NEXT(nuidp, nu_lru); |
| 823 | LIST_REMOVE(nuidp, nu_hash); |
| 824 | TAILQ_REMOVE(&slp->ns_uidlruhead, nuidp, nu_lru); |
| 825 | if (nuidp->nu_flag & NU_NAM) |
| 826 | m_freem(nuidp->nu_nam); |
| 827 | kmem_free(nuidp, sizeof(*nuidp)); |
| 828 | } |
| 829 | mutex_enter(&nfsd_lock); |
| 830 | while ((nwp = LIST_FIRST(&slp->ns_tq)) != NULL) { |
| 831 | LIST_REMOVE(nwp, nd_tq); |
| 832 | mutex_exit(&nfsd_lock); |
| 833 | nfsdreq_free(nwp); |
| 834 | mutex_enter(&nfsd_lock); |
| 835 | } |
| 836 | mutex_exit(&nfsd_lock); |
| 837 | } |
| 838 | |
| 839 | /* |
| 840 | * Derefence a server socket structure. If it has no more references and |
| 841 | * is no longer valid, you can throw it away. |
| 842 | */ |
| 843 | void |
| 844 | nfsrv_slpderef(struct nfssvc_sock *slp) |
| 845 | { |
| 846 | uint32_t ref; |
| 847 | |
| 848 | mutex_enter(&nfsd_lock); |
| 849 | KASSERT(slp->ns_sref > 0); |
| 850 | ref = --slp->ns_sref; |
| 851 | if (ref == 0 && (slp->ns_flags & SLP_VALID) == 0) { |
| 852 | file_t *fp; |
| 853 | |
| 854 | KASSERT((slp->ns_gflags & SLP_G_DOREC) == 0); |
| 855 | TAILQ_REMOVE(&nfssvc_sockhead, slp, ns_chain); |
| 856 | mutex_exit(&nfsd_lock); |
| 857 | |
| 858 | fp = slp->ns_fp; |
| 859 | if (fp != NULL) { |
| 860 | slp->ns_fp = NULL; |
| 861 | KASSERT(fp != NULL); |
| 862 | KASSERT(fp->f_socket == slp->ns_so); |
| 863 | KASSERT(fp->f_count > 0); |
| 864 | closef(fp); |
| 865 | slp->ns_so = NULL; |
| 866 | } |
| 867 | |
| 868 | if (slp->ns_nam) |
| 869 | m_free(slp->ns_nam); |
| 870 | nfsrv_sockfree(slp); |
| 871 | } else |
| 872 | mutex_exit(&nfsd_lock); |
| 873 | } |
| 874 | |
| 875 | /* |
| 876 | * Initialize the data structures for the server. |
| 877 | * Handshake with any new nfsds starting up to avoid any chance of |
| 878 | * corruption. |
| 879 | */ |
| 880 | void |
| 881 | nfsrv_init(int terminating) |
| 882 | { |
| 883 | struct nfssvc_sock *slp; |
| 884 | |
| 885 | if (!terminating) { |
| 886 | mutex_init(&nfsd_lock, MUTEX_DRIVER, IPL_SOFTNET); |
| 887 | cv_init(&nfsd_initcv, "nfsdinit" ); |
| 888 | } |
| 889 | |
| 890 | mutex_enter(&nfsd_lock); |
| 891 | if (!terminating && (nfssvc_sockhead_flag & SLP_INIT) != 0) |
| 892 | panic("nfsd init" ); |
| 893 | nfssvc_sockhead_flag |= SLP_INIT; |
| 894 | |
| 895 | if (terminating) { |
| 896 | KASSERT(SLIST_EMPTY(&nfsd_idle_head)); |
| 897 | KASSERT(TAILQ_EMPTY(&nfsd_head)); |
| 898 | while ((slp = TAILQ_FIRST(&nfssvc_sockhead)) != NULL) { |
| 899 | mutex_exit(&nfsd_lock); |
| 900 | KASSERT(slp->ns_sref == 0); |
| 901 | slp->ns_sref++; |
| 902 | nfsrv_zapsock(slp); |
| 903 | nfsrv_slpderef(slp); |
| 904 | mutex_enter(&nfsd_lock); |
| 905 | } |
| 906 | KASSERT(TAILQ_EMPTY(&nfssvc_sockpending)); |
| 907 | mutex_exit(&nfsd_lock); |
| 908 | nfsrv_cleancache(); /* And clear out server cache */ |
| 909 | } else { |
| 910 | mutex_exit(&nfsd_lock); |
| 911 | nfs_pub.np_valid = 0; |
| 912 | } |
| 913 | |
| 914 | TAILQ_INIT(&nfssvc_sockhead); |
| 915 | TAILQ_INIT(&nfssvc_sockpending); |
| 916 | |
| 917 | TAILQ_INIT(&nfsd_head); |
| 918 | SLIST_INIT(&nfsd_idle_head); |
| 919 | nfsd_head_flag &= ~NFSD_CHECKSLP; |
| 920 | |
| 921 | nfs_udpsock = nfsrv_sockalloc(); |
| 922 | nfs_udp6sock = nfsrv_sockalloc(); |
| 923 | |
| 924 | mutex_enter(&nfsd_lock); |
| 925 | nfssvc_sockhead_flag &= ~SLP_INIT; |
| 926 | cv_broadcast(&nfsd_initcv); |
| 927 | mutex_exit(&nfsd_lock); |
| 928 | } |
| 929 | |
| 930 | void |
| 931 | nfsrv_fini(void) |
| 932 | { |
| 933 | |
| 934 | nfsrv_init(true); |
| 935 | cv_destroy(&nfsd_initcv); |
| 936 | mutex_destroy(&nfsd_lock); |
| 937 | } |
| 938 | |
| 939 | /* |
| 940 | * Add entries to the server monitor log. |
| 941 | */ |
| 942 | static void |
| 943 | nfsd_rt(int sotype, struct nfsrv_descript *nd, int cacherep) |
| 944 | { |
| 945 | struct timeval tv; |
| 946 | struct drt *rt; |
| 947 | |
| 948 | rt = &nfsdrt.drt[nfsdrt.pos]; |
| 949 | if (cacherep == RC_DOIT) |
| 950 | rt->flag = 0; |
| 951 | else if (cacherep == RC_REPLY) |
| 952 | rt->flag = DRT_CACHEREPLY; |
| 953 | else |
| 954 | rt->flag = DRT_CACHEDROP; |
| 955 | if (sotype == SOCK_STREAM) |
| 956 | rt->flag |= DRT_TCP; |
| 957 | if (nd->nd_flag & ND_NFSV3) |
| 958 | rt->flag |= DRT_NFSV3; |
| 959 | rt->proc = nd->nd_procnum; |
| 960 | if (mtod(nd->nd_nam, struct sockaddr *)->sa_family == AF_INET) |
| 961 | rt->ipadr = mtod(nd->nd_nam, struct sockaddr_in *)->sin_addr.s_addr; |
| 962 | else |
| 963 | rt->ipadr = INADDR_ANY; |
| 964 | getmicrotime(&tv); |
| 965 | rt->resptime = ((tv.tv_sec - nd->nd_starttime.tv_sec) * 1000000) + |
| 966 | (tv.tv_usec - nd->nd_starttime.tv_usec); |
| 967 | rt->tstamp = tv; |
| 968 | nfsdrt.pos = (nfsdrt.pos + 1) % NFSRTTLOGSIZ; |
| 969 | } |
| 970 | |