45452edc37
in sys/nfs/nfs_nfssvc.c by registering with it using the nfsd_call_nfsserver function pointer. Also, add the build glue for nfs_nfssvc.c optionally based on "nfsserver" and also as a loadable module. Submitted by: rmacklem Reviewed by: kib Approved by: kib (mentor)
606 lines
14 KiB
C
606 lines
14 KiB
C
/*-
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* Copyright (c) 1989, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Rick Macklem at The University of Guelph.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)nfs_syscalls.c 8.5 (Berkeley) 3/30/95
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "opt_inet6.h"
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#include "opt_kgssapi.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/sysproto.h>
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#include <sys/kernel.h>
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#include <sys/sysctl.h>
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#include <sys/file.h>
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#include <sys/filedesc.h>
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#include <sys/vnode.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/priv.h>
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#include <sys/proc.h>
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#include <sys/bio.h>
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#include <sys/buf.h>
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#include <sys/mbuf.h>
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#include <sys/socket.h>
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#include <sys/socketvar.h>
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#include <sys/domain.h>
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#include <sys/protosw.h>
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#include <sys/namei.h>
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#include <sys/fcntl.h>
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#include <sys/lockf.h>
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#include <sys/eventhandler.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#ifdef INET6
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#include <net/if.h>
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#include <netinet6/in6_var.h>
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#endif
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#include <rpc/rpc.h>
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#include <rpc/rpcsec_gss.h>
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#include <rpc/replay.h>
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#include <nfs/xdr_subs.h>
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#include <nfs/rpcv2.h>
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#include <nfs/nfsproto.h>
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#include <nfsserver/nfs.h>
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#include <nfsserver/nfsm_subs.h>
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#include <nfsserver/nfsrvcache.h>
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#include <nfsserver/nfs_fha.h>
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#ifndef NFS_LEGACYRPC
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static MALLOC_DEFINE(M_NFSSVC, "nfss_srvsock", "Nfs server structure");
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MALLOC_DEFINE(M_NFSRVDESC, "nfss_srvdesc", "NFS server socket descriptor");
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MALLOC_DEFINE(M_NFSD, "nfss_daemon", "Nfs server daemon structure");
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#define TRUE 1
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#define FALSE 0
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SYSCTL_DECL(_vfs_nfsrv);
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SVCPOOL *nfsrv_pool;
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int nfsd_waiting = 0;
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int nfsrv_numnfsd = 0;
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static int nfs_realign_test;
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static int nfs_realign_count;
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struct callout nfsrv_callout;
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static eventhandler_tag nfsrv_nmbclusters_tag;
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static int nfs_privport = 0;
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SYSCTL_INT(_vfs_nfsrv, NFS_NFSPRIVPORT, nfs_privport, CTLFLAG_RW,
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&nfs_privport, 0,
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"Only allow clients using a privileged port");
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SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay, CTLFLAG_RW,
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&nfsrvw_procrastinate, 0,
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"Delay value for write gathering");
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SYSCTL_INT(_vfs_nfsrv, OID_AUTO, gatherdelay_v3, CTLFLAG_RW,
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&nfsrvw_procrastinate_v3, 0,
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"Delay in seconds for NFSv3 write gathering");
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SYSCTL_INT(_vfs_nfsrv, OID_AUTO, realign_test, CTLFLAG_RW,
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&nfs_realign_test, 0, "");
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SYSCTL_INT(_vfs_nfsrv, OID_AUTO, realign_count, CTLFLAG_RW,
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&nfs_realign_count, 0, "");
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static int nfssvc_addsock(struct file *, struct thread *);
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static int nfssvc_nfsd(struct thread *, struct nfsd_nfsd_args *);
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extern u_long sb_max_adj;
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int32_t (*nfsrv3_procs[NFS_NPROCS])(struct nfsrv_descript *nd,
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struct nfssvc_sock *slp, struct mbuf **mreqp) = {
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nfsrv_null,
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nfsrv_getattr,
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nfsrv_setattr,
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nfsrv_lookup,
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nfsrv3_access,
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nfsrv_readlink,
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nfsrv_read,
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nfsrv_write,
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nfsrv_create,
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nfsrv_mkdir,
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nfsrv_symlink,
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nfsrv_mknod,
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nfsrv_remove,
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nfsrv_rmdir,
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nfsrv_rename,
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nfsrv_link,
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nfsrv_readdir,
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nfsrv_readdirplus,
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nfsrv_statfs,
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nfsrv_fsinfo,
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nfsrv_pathconf,
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nfsrv_commit,
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nfsrv_noop
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};
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/*
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* NFS server system calls
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*/
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/*
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* This is now called from nfssvc() in nfs/nfs_nfssvc.c.
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*/
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/*
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* Nfs server psuedo system call for the nfsd's
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* Based on the flag value it either:
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* - adds a socket to the selection list
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* - remains in the kernel as an nfsd
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* - remains in the kernel as an nfsiod
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* For INET6 we suppose that nfsd provides only IN6P_IPV6_V6ONLY sockets
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* and that mountd provides
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* - sockaddr with no IPv4-mapped addresses
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* - mask for both INET and INET6 families if there is IPv4-mapped overlap
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*/
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int
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nfssvc_nfsserver(struct thread *td, struct nfssvc_args *uap)
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{
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struct file *fp;
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struct nfsd_addsock_args addsockarg;
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struct nfsd_nfsd_args nfsdarg;
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int error;
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if (uap->flag & NFSSVC_ADDSOCK) {
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error = copyin(uap->argp, (caddr_t)&addsockarg,
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sizeof(addsockarg));
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if (error)
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return (error);
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if ((error = fget(td, addsockarg.sock, &fp)) != 0)
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return (error);
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if (fp->f_type != DTYPE_SOCKET) {
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fdrop(fp, td);
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return (error); /* XXXRW: Should be EINVAL? */
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}
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error = nfssvc_addsock(fp, td);
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fdrop(fp, td);
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} else if (uap->flag & NFSSVC_OLDNFSD) {
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error = nfssvc_nfsd(td, NULL);
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} else if (uap->flag & NFSSVC_NFSD) {
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if (!uap->argp)
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return (EINVAL);
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error = copyin(uap->argp, (caddr_t)&nfsdarg,
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sizeof(nfsdarg));
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if (error)
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return (error);
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error = nfssvc_nfsd(td, &nfsdarg);
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} else {
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error = ENXIO;
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}
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return (error);
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}
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/*
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* Generate the rpc reply header
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* siz arg. is used to decide if adding a cluster is worthwhile
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*/
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struct mbuf *
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nfs_rephead(int siz, struct nfsrv_descript *nd, int err,
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struct mbuf **mbp, caddr_t *bposp)
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{
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u_int32_t *tl;
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struct mbuf *mreq;
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caddr_t bpos;
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struct mbuf *mb;
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if (err == EBADRPC)
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return (NULL);
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nd->nd_repstat = err;
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if (err && (nd->nd_flag & ND_NFSV3) == 0) /* XXX recheck */
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siz = 0;
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MGET(mreq, M_WAIT, MT_DATA);
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/*
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* If this is a big reply, use a cluster
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*/
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mreq->m_len = 0;
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if (siz >= MINCLSIZE) {
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MCLGET(mreq, M_WAIT);
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}
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mb = mreq;
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bpos = mtod(mb, caddr_t);
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if (err != NFSERR_RETVOID) {
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tl = nfsm_build(u_int32_t *, NFSX_UNSIGNED);
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if (err)
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*tl = txdr_unsigned(nfsrv_errmap(nd, err));
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else
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*tl = 0;
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}
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*mbp = mb;
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*bposp = bpos;
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if (err != 0 && err != NFSERR_RETVOID)
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nfsrvstats.srvrpc_errs++;
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return (mreq);
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}
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/*
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* nfs_realign:
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*
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* Check for badly aligned mbuf data and realign by copying the unaligned
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* portion of the data into a new mbuf chain and freeing the portions
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* of the old chain that were replaced.
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*
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* We cannot simply realign the data within the existing mbuf chain
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* because the underlying buffers may contain other rpc commands and
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* we cannot afford to overwrite them.
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*
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* We would prefer to avoid this situation entirely. The situation does
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* not occur with NFS/UDP and is supposed to only occassionally occur
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* with TCP. Use vfs.nfs.realign_count and realign_test to check this.
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*/
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static void
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nfs_realign(struct mbuf **pm) /* XXX COMMON */
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{
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struct mbuf *m;
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struct mbuf *n = NULL;
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int off = 0;
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++nfs_realign_test;
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while ((m = *pm) != NULL) {
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if ((m->m_len & 0x3) || (mtod(m, intptr_t) & 0x3)) {
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MGET(n, M_WAIT, MT_DATA);
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if (m->m_len >= MINCLSIZE) {
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MCLGET(n, M_WAIT);
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}
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n->m_len = 0;
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break;
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}
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pm = &m->m_next;
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}
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/*
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* If n is non-NULL, loop on m copying data, then replace the
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* portion of the chain that had to be realigned.
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*/
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if (n != NULL) {
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++nfs_realign_count;
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while (m) {
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m_copyback(n, off, m->m_len, mtod(m, caddr_t));
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off += m->m_len;
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m = m->m_next;
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}
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m_freem(*pm);
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*pm = n;
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}
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}
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static void
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nfssvc_program(struct svc_req *rqst, SVCXPRT *xprt)
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{
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rpcproc_t procnum;
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int32_t (*proc)(struct nfsrv_descript *nd, struct nfssvc_sock *slp,
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struct mbuf **mreqp);
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int flag;
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struct nfsrv_descript nd;
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struct mbuf *mreq, *mrep;
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int error;
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if (rqst->rq_vers == NFS_VER2) {
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if (rqst->rq_proc > NFSV2PROC_STATFS) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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return;
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}
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procnum = nfsrv_nfsv3_procid[rqst->rq_proc];
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flag = 0;
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} else {
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if (rqst->rq_proc >= NFS_NPROCS) {
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svcerr_noproc(rqst);
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svc_freereq(rqst);
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return;
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}
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procnum = rqst->rq_proc;
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flag = ND_NFSV3;
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}
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proc = nfsrv3_procs[procnum];
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mreq = mrep = NULL;
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mreq = rqst->rq_args;
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rqst->rq_args = NULL;
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nfs_realign(&mreq);
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/*
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* Note: we want rq_addr, not svc_getrpccaller for nd_nam2 -
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* NFS_SRVMAXDATA uses a NULL value for nd_nam2 to detect TCP
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* mounts.
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*/
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memset(&nd, 0, sizeof(nd));
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nd.nd_md = nd.nd_mrep = mreq;
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nd.nd_dpos = mtod(mreq, caddr_t);
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nd.nd_nam = svc_getrpccaller(rqst);
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nd.nd_nam2 = rqst->rq_addr;
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nd.nd_procnum = procnum;
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nd.nd_cr = NULL;
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nd.nd_flag = flag;
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if (nfs_privport) {
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/* Check if source port is privileged */
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u_short port;
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struct sockaddr *nam = nd.nd_nam;
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struct sockaddr_in *sin;
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sin = (struct sockaddr_in *)nam;
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/*
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* INET/INET6 - same code:
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* sin_port and sin6_port are at same offset
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*/
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port = ntohs(sin->sin_port);
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if (port >= IPPORT_RESERVED &&
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nd.nd_procnum != NFSPROC_NULL) {
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#ifdef INET6
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char b6[INET6_ADDRSTRLEN];
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#if defined(KLD_MODULE)
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/* Do not use ip6_sprintf: the nfs module should work without INET6. */
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#define ip6_sprintf(buf, a) \
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(sprintf((buf), "%x:%x:%x:%x:%x:%x:%x:%x", \
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(a)->s6_addr16[0], (a)->s6_addr16[1], \
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(a)->s6_addr16[2], (a)->s6_addr16[3], \
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(a)->s6_addr16[4], (a)->s6_addr16[5], \
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(a)->s6_addr16[6], (a)->s6_addr16[7]), \
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(buf))
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#endif
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#endif
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printf("NFS request from unprivileged port (%s:%d)\n",
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#ifdef INET6
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sin->sin_family == AF_INET6 ?
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ip6_sprintf(b6, &satosin6(sin)->sin6_addr) :
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#if defined(KLD_MODULE)
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#undef ip6_sprintf
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#endif
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#endif
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inet_ntoa(sin->sin_addr), port);
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m_freem(mreq);
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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return;
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}
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}
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if (proc != nfsrv_null) {
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if (!svc_getcred(rqst, &nd.nd_cr, &nd.nd_credflavor)) {
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m_freem(mreq);
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svcerr_weakauth(rqst);
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svc_freereq(rqst);
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return;
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}
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#ifdef MAC
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mac_cred_associate_nfsd(nd.nd_cr);
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#endif
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}
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nfsrvstats.srvrpccnt[nd.nd_procnum]++;
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error = proc(&nd, NULL, &mrep);
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if (nd.nd_cr)
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crfree(nd.nd_cr);
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if (mrep == NULL) {
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svcerr_decode(rqst);
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svc_freereq(rqst);
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return;
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}
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if (error && error != NFSERR_RETVOID) {
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svcerr_systemerr(rqst);
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svc_freereq(rqst);
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return;
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}
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if (nd.nd_repstat & NFSERR_AUTHERR) {
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svcerr_auth(rqst, nd.nd_repstat & ~NFSERR_AUTHERR);
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m_freem(mrep);
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} else {
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if (!svc_sendreply_mbuf(rqst, mrep))
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svcerr_systemerr(rqst);
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}
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svc_freereq(rqst);
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}
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/*
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* Adds a socket to the list for servicing by nfsds.
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*/
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static int
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nfssvc_addsock(struct file *fp, struct thread *td)
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{
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int siz;
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struct socket *so;
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int error;
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SVCXPRT *xprt;
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so = fp->f_data;
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siz = sb_max_adj;
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error = soreserve(so, siz, siz);
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if (error) {
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return (error);
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}
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/*
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* Steal the socket from userland so that it doesn't close
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* unexpectedly.
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*/
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if (so->so_type == SOCK_DGRAM)
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xprt = svc_dg_create(nfsrv_pool, so, 0, 0);
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else
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xprt = svc_vc_create(nfsrv_pool, so, 0, 0);
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if (xprt) {
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fp->f_ops = &badfileops;
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fp->f_data = NULL;
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svc_reg(xprt, NFS_PROG, NFS_VER2, nfssvc_program, NULL);
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svc_reg(xprt, NFS_PROG, NFS_VER3, nfssvc_program, NULL);
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}
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return (0);
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}
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/*
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* Called by nfssvc() for nfsds. Just loops around servicing rpc requests
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* until it is killed by a signal.
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*/
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static int
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nfssvc_nfsd(struct thread *td, struct nfsd_nfsd_args *args)
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{
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#ifdef KGSSAPI
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char principal[128];
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int error;
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#endif
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#ifdef KGSSAPI
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if (args) {
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error = copyinstr(args->principal, principal,
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sizeof(principal), NULL);
|
|
if (error)
|
|
return (error);
|
|
} else {
|
|
snprintf(principal, sizeof(principal), "nfs@%s", hostname);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* Only the first nfsd actually does any work. The RPC code
|
|
* adds threads to it as needed. Any extra processes offered
|
|
* by nfsd just exit. If nfsd is new enough, it will call us
|
|
* once with a structure that specifies how many threads to
|
|
* use.
|
|
*/
|
|
NFSD_LOCK();
|
|
if (nfsrv_numnfsd == 0) {
|
|
nfsrv_numnfsd++;
|
|
|
|
NFSD_UNLOCK();
|
|
|
|
#ifdef KGSSAPI
|
|
rpc_gss_set_svc_name(principal, "kerberosv5",
|
|
GSS_C_INDEFINITE, NFS_PROG, NFS_VER2);
|
|
rpc_gss_set_svc_name(principal, "kerberosv5",
|
|
GSS_C_INDEFINITE, NFS_PROG, NFS_VER3);
|
|
#endif
|
|
|
|
if (args) {
|
|
nfsrv_pool->sp_minthreads = args->minthreads;
|
|
nfsrv_pool->sp_maxthreads = args->maxthreads;
|
|
} else {
|
|
nfsrv_pool->sp_minthreads = 4;
|
|
nfsrv_pool->sp_maxthreads = 4;
|
|
}
|
|
|
|
svc_run(nfsrv_pool);
|
|
|
|
#ifdef KGSSAPI
|
|
rpc_gss_clear_svc_name(NFS_PROG, NFS_VER2);
|
|
rpc_gss_clear_svc_name(NFS_PROG, NFS_VER3);
|
|
#endif
|
|
|
|
NFSD_LOCK();
|
|
nfsrv_numnfsd--;
|
|
nfsrv_init(TRUE);
|
|
}
|
|
NFSD_UNLOCK();
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Size the NFS server's duplicate request cache at 1/2 the
|
|
* nmbclusters, floating within a (64, 2048) range. This is to
|
|
* prevent all mbuf clusters being tied up in the NFS dupreq
|
|
* cache for small values of nmbclusters.
|
|
*/
|
|
static size_t
|
|
nfsrv_replay_size(void)
|
|
{
|
|
size_t replaysiz;
|
|
|
|
replaysiz = nmbclusters / 2;
|
|
if (replaysiz > NFSRVCACHE_MAX_SIZE)
|
|
replaysiz = NFSRVCACHE_MAX_SIZE;
|
|
if (replaysiz < NFSRVCACHE_MIN_SIZE)
|
|
replaysiz = NFSRVCACHE_MIN_SIZE;
|
|
replaysiz *= MCLBYTES;
|
|
|
|
return (replaysiz);
|
|
}
|
|
|
|
/*
|
|
* Called when nmbclusters changes - we resize the replay cache
|
|
* accordingly.
|
|
*/
|
|
static void
|
|
nfsrv_nmbclusters_change(void *tag)
|
|
{
|
|
|
|
if (nfsrv_pool)
|
|
replay_setsize(nfsrv_pool->sp_rcache, nfsrv_replay_size());
|
|
}
|
|
|
|
/*
|
|
* Initialize the data structures for the server.
|
|
* Handshake with any new nfsds starting up to avoid any chance of
|
|
* corruption.
|
|
*/
|
|
void
|
|
nfsrv_init(int terminating)
|
|
{
|
|
|
|
NFSD_LOCK_ASSERT();
|
|
|
|
if (terminating) {
|
|
NFSD_UNLOCK();
|
|
EVENTHANDLER_DEREGISTER(nmbclusters_change,
|
|
nfsrv_nmbclusters_tag);
|
|
svcpool_destroy(nfsrv_pool);
|
|
nfsrv_pool = NULL;
|
|
NFSD_LOCK();
|
|
} else
|
|
nfs_pub.np_valid = 0;
|
|
|
|
NFSD_UNLOCK();
|
|
|
|
nfsrv_pool = svcpool_create("nfsd", SYSCTL_STATIC_CHILDREN(_vfs_nfsrv));
|
|
nfsrv_pool->sp_rcache = replay_newcache(nfsrv_replay_size());
|
|
nfsrv_pool->sp_assign = fha_assign;
|
|
nfsrv_pool->sp_done = fha_nd_complete;
|
|
nfsrv_nmbclusters_tag = EVENTHANDLER_REGISTER(nmbclusters_change,
|
|
nfsrv_nmbclusters_change, NULL, EVENTHANDLER_PRI_FIRST);
|
|
|
|
NFSD_LOCK();
|
|
}
|
|
|
|
#endif /* !NFS_LEGACYRPC */
|