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freebsd-skq/sys/nfsclient/nfs_vfsops.c
archie 982e80577d Examine all occurrences of sprintf(), strcat(), and str[n]cpy() 
for possible buffer overflow problems. Replaced most sprintf()'s
with snprintf(); for others cases, added terminating NUL bytes where
appropriate, replaced constants like "16" with sizeof(), etc.

These changes include several bug fixes, but most changes are for
maintainability's sake. Any instance where it wasn't "immediately
obvious" that a buffer overflow could not occur was made safer.

Reviewed by:	Bruce Evans <bde@zeta.org.au>
Reviewed by:	Matthew Dillon <dillon@apollo.backplane.com>
Reviewed by:	Mike Spengler <mks@networkcs.com>
1998-12-04 22:54:57 +00:00

1156 lines
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/*
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rick Macklem at The University of Guelph.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)nfs_vfsops.c 8.12 (Berkeley) 5/20/95
* $Id: nfs_vfsops.c,v 1.78 1998/10/31 15:31:26 peter Exp $
*/
#include <sys/param.h>
#include <sys/sockio.h>
#include <sys/proc.h>
#include <sys/vnode.h>
#include <sys/kernel.h>
#include <sys/sysctl.h>
#include <sys/malloc.h>
#include <sys/mount.h>
#include <sys/mbuf.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_zone.h>
#include <net/if.h>
#include <net/route.h>
#include <netinet/in.h>
#include <nfs/rpcv2.h>
#include <nfs/nfsproto.h>
#include <nfs/nfs.h>
#include <nfs/nfsnode.h>
#include <nfs/nfsmount.h>
#include <nfs/xdr_subs.h>
#include <nfs/nfsm_subs.h>
#include <nfs/nfsdiskless.h>
#include <nfs/nqnfs.h>
extern int nfs_mountroot __P((struct mount *mp));
extern int nfs_ticks;
MALLOC_DEFINE(M_NFSREQ, "NFS req", "NFS request header");
MALLOC_DEFINE(M_NFSBIGFH, "NFSV3 bigfh", "NFS version 3 file handle");
MALLOC_DEFINE(M_NFSD, "NFS daemon", "Nfs server daemon structure");
MALLOC_DEFINE(M_NFSDIROFF, "NFSV3 diroff", "NFS directory offset data");
MALLOC_DEFINE(M_NFSRVDESC, "NFSV3 srvdesc", "NFS server socket descriptor");
MALLOC_DEFINE(M_NFSUID, "NFS uid", "Nfs uid mapping structure");
MALLOC_DEFINE(M_NQLEASE, "NQNFS Lease", "Nqnfs lease");
MALLOC_DEFINE(M_NFSHASH, "NFS hash", "NFS hash tables");
vm_zone_t nfsmount_zone;
struct nfsstats nfsstats;
SYSCTL_NODE(_vfs, OID_AUTO, nfs, CTLFLAG_RW, 0, "NFS filesystem");
SYSCTL_STRUCT(_vfs_nfs, NFS_NFSSTATS, nfsstats, CTLFLAG_RD,
&nfsstats, nfsstats, "");
#ifdef NFS_DEBUG
int nfs_debug;
SYSCTL_INT(_vfs_nfs, OID_AUTO, debug, CTLFLAG_RW, &nfs_debug, 0, "");
#endif
static int nfs_iosize __P((struct nfsmount *nmp));
static void nfs_decode_args __P((struct nfsmount *nmp,
struct nfs_args *argp));
static int mountnfs __P((struct nfs_args *,struct mount *,
struct sockaddr *,char *,char *,struct vnode **));
static int nfs_mount __P(( struct mount *mp, char *path, caddr_t data,
struct nameidata *ndp, struct proc *p));
static int nfs_start __P(( struct mount *mp, int flags,
struct proc *p));
static int nfs_unmount __P(( struct mount *mp, int mntflags,
struct proc *p));
static int nfs_root __P(( struct mount *mp, struct vnode **vpp));
static int nfs_quotactl __P(( struct mount *mp, int cmds, uid_t uid,
caddr_t arg, struct proc *p));
static int nfs_statfs __P(( struct mount *mp, struct statfs *sbp,
struct proc *p));
static int nfs_sync __P(( struct mount *mp, int waitfor,
struct ucred *cred, struct proc *p));
static int nfs_vptofh __P(( struct vnode *vp, struct fid *fhp));
static int nfs_fhtovp __P((struct mount *mp, struct fid *fhp,
struct sockaddr *nam, struct vnode **vpp,
int *exflagsp, struct ucred **credanonp));
static int nfs_vget __P((struct mount *, ino_t, struct vnode **));
/*
* nfs vfs operations.
*/
static struct vfsops nfs_vfsops = {
nfs_mount,
nfs_start,
nfs_unmount,
nfs_root,
nfs_quotactl,
nfs_statfs,
nfs_sync,
nfs_vget,
nfs_fhtovp,
nfs_vptofh,
nfs_init,
nfs_uninit,
&sysctl___vfs_nfs
};
VFS_SET(nfs_vfsops, nfs, VFCF_NETWORK);
/*
* This structure must be filled in by a primary bootstrap or bootstrap
* server for a diskless/dataless machine. It is initialized below just
* to ensure that it is allocated to initialized data (.data not .bss).
*/
struct nfs_diskless nfs_diskless = { 0 };
struct nfsv3_diskless nfsv3_diskless = { 0 };
int nfs_diskless_valid = 0;
SYSCTL_INT(_vfs_nfs, OID_AUTO, diskless_valid, CTLFLAG_RD,
&nfs_diskless_valid, 0, "");
SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_rootpath, CTLFLAG_RD,
nfsv3_diskless.root_hostnam, 0, "");
SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_rootaddr, CTLFLAG_RD,
&nfsv3_diskless.root_saddr, sizeof nfsv3_diskless.root_saddr,
"%Ssockaddr_in", "");
SYSCTL_STRING(_vfs_nfs, OID_AUTO, diskless_swappath, CTLFLAG_RD,
nfsv3_diskless.swap_hostnam, 0, "");
SYSCTL_OPAQUE(_vfs_nfs, OID_AUTO, diskless_swapaddr, CTLFLAG_RD,
&nfsv3_diskless.swap_saddr, sizeof nfsv3_diskless.swap_saddr,
"%Ssockaddr_in","");
void nfsargs_ntoh __P((struct nfs_args *));
static int nfs_mountdiskless __P((char *, char *, int,
struct sockaddr_in *, struct nfs_args *,
struct proc *, struct vnode **,
struct mount **));
static void nfs_convert_diskless __P((void));
static void nfs_convert_oargs __P((struct nfs_args *args,
struct onfs_args *oargs));
static int
nfs_iosize(nmp)
struct nfsmount* nmp;
{
int iosize;
/*
* Calculate the size used for io buffers. Use the larger
* of the two sizes to minimise nfs requests but make sure
* that it is at least one VM page to avoid wasting buffer
* space.
*/
iosize = max(nmp->nm_rsize, nmp->nm_wsize);
if (iosize < PAGE_SIZE) iosize = PAGE_SIZE;
return iosize;
}
static void
nfs_convert_oargs(args, oargs)
struct nfs_args *args;
struct onfs_args *oargs;
{
args->version = NFS_ARGSVERSION;
args->addr = oargs->addr;
args->addrlen = oargs->addrlen;
args->sotype = oargs->sotype;
args->proto = oargs->proto;
args->fh = oargs->fh;
args->fhsize = oargs->fhsize;
args->flags = oargs->flags;
args->wsize = oargs->wsize;
args->rsize = oargs->rsize;
args->readdirsize = oargs->readdirsize;
args->timeo = oargs->timeo;
args->retrans = oargs->retrans;
args->maxgrouplist = oargs->maxgrouplist;
args->readahead = oargs->readahead;
args->leaseterm = oargs->leaseterm;
args->deadthresh = oargs->deadthresh;
args->hostname = oargs->hostname;
}
static void
nfs_convert_diskless()
{
bcopy(&nfs_diskless.myif, &nfsv3_diskless.myif,
sizeof(struct ifaliasreq));
bcopy(&nfs_diskless.mygateway, &nfsv3_diskless.mygateway,
sizeof(struct sockaddr_in));
nfs_convert_oargs(&nfsv3_diskless.swap_args,&nfs_diskless.swap_args);
nfsv3_diskless.swap_fhsize = NFSX_V2FH;
bcopy(nfs_diskless.swap_fh,nfsv3_diskless.swap_fh,NFSX_V2FH);
bcopy(&nfs_diskless.swap_saddr,&nfsv3_diskless.swap_saddr,
sizeof(struct sockaddr_in));
bcopy(nfs_diskless.swap_hostnam,nfsv3_diskless.swap_hostnam, MNAMELEN);
nfsv3_diskless.swap_nblks = nfs_diskless.swap_nblks;
bcopy(&nfs_diskless.swap_ucred, &nfsv3_diskless.swap_ucred,
sizeof(struct ucred));
nfs_convert_oargs(&nfsv3_diskless.root_args,&nfs_diskless.root_args);
nfsv3_diskless.root_fhsize = NFSX_V2FH;
bcopy(nfs_diskless.root_fh,nfsv3_diskless.root_fh,NFSX_V2FH);
bcopy(&nfs_diskless.root_saddr,&nfsv3_diskless.root_saddr,
sizeof(struct sockaddr_in));
bcopy(nfs_diskless.root_hostnam,nfsv3_diskless.root_hostnam, MNAMELEN);
nfsv3_diskless.root_time = nfs_diskless.root_time;
bcopy(nfs_diskless.my_hostnam,nfsv3_diskless.my_hostnam,
MAXHOSTNAMELEN);
nfs_diskless_valid = 3;
}
/*
* nfs statfs call
*/
int
nfs_statfs(mp, sbp, p)
struct mount *mp;
register struct statfs *sbp;
struct proc *p;
{
register struct vnode *vp;
register struct nfs_statfs *sfp;
register caddr_t cp;
register u_int32_t *tl;
register int32_t t1, t2;
caddr_t bpos, dpos, cp2;
struct nfsmount *nmp = VFSTONFS(mp);
int error = 0, v3 = (nmp->nm_flag & NFSMNT_NFSV3), retattr;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
struct ucred *cred;
struct nfsnode *np;
u_quad_t tquad;
#ifndef nolint
sfp = (struct nfs_statfs *)0;
#endif
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
return (error);
vp = NFSTOV(np);
cred = crget();
cred->cr_ngroups = 1;
if (v3 && (nmp->nm_state & NFSSTA_GOTFSINFO) == 0)
(void)nfs_fsinfo(nmp, vp, cred, p);
nfsstats.rpccnt[NFSPROC_FSSTAT]++;
nfsm_reqhead(vp, NFSPROC_FSSTAT, NFSX_FH(v3));
nfsm_fhtom(vp, v3);
nfsm_request(vp, NFSPROC_FSSTAT, p, cred);
if (v3)
nfsm_postop_attr(vp, retattr);
if (error) {
if (mrep != NULL)
m_free(mrep);
goto nfsmout;
}
nfsm_dissect(sfp, struct nfs_statfs *, NFSX_STATFS(v3));
sbp->f_flags = nmp->nm_flag;
sbp->f_iosize = nfs_iosize(nmp);
if (v3) {
sbp->f_bsize = NFS_FABLKSIZE;
fxdr_hyper(&sfp->sf_tbytes, &tquad);
sbp->f_blocks = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
fxdr_hyper(&sfp->sf_fbytes, &tquad);
sbp->f_bfree = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
fxdr_hyper(&sfp->sf_abytes, &tquad);
sbp->f_bavail = (long)(tquad / ((u_quad_t)NFS_FABLKSIZE));
sbp->f_files = (fxdr_unsigned(int32_t,
sfp->sf_tfiles.nfsuquad[1]) & 0x7fffffff);
sbp->f_ffree = (fxdr_unsigned(int32_t,
sfp->sf_ffiles.nfsuquad[1]) & 0x7fffffff);
} else {
sbp->f_bsize = fxdr_unsigned(int32_t, sfp->sf_bsize);
sbp->f_blocks = fxdr_unsigned(int32_t, sfp->sf_blocks);
sbp->f_bfree = fxdr_unsigned(int32_t, sfp->sf_bfree);
sbp->f_bavail = fxdr_unsigned(int32_t, sfp->sf_bavail);
sbp->f_files = 0;
sbp->f_ffree = 0;
}
if (sbp != &mp->mnt_stat) {
sbp->f_type = mp->mnt_vfc->vfc_typenum;
bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
}
nfsm_reqdone;
vput(vp);
crfree(cred);
return (error);
}
/*
* nfs version 3 fsinfo rpc call
*/
int
nfs_fsinfo(nmp, vp, cred, p)
register struct nfsmount *nmp;
register struct vnode *vp;
struct ucred *cred;
struct proc *p;
{
register struct nfsv3_fsinfo *fsp;
register caddr_t cp;
register int32_t t1, t2;
register u_int32_t *tl, pref, max;
caddr_t bpos, dpos, cp2;
int error = 0, retattr;
struct mbuf *mreq, *mrep, *md, *mb, *mb2;
u_int64_t maxfsize;
nfsstats.rpccnt[NFSPROC_FSINFO]++;
nfsm_reqhead(vp, NFSPROC_FSINFO, NFSX_FH(1));
nfsm_fhtom(vp, 1);
nfsm_request(vp, NFSPROC_FSINFO, p, cred);
nfsm_postop_attr(vp, retattr);
if (!error) {
nfsm_dissect(fsp, struct nfsv3_fsinfo *, NFSX_V3FSINFO);
pref = fxdr_unsigned(u_int32_t, fsp->fs_wtpref);
if (pref < nmp->nm_wsize && pref >= NFS_FABLKSIZE)
nmp->nm_wsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_wtmax);
if (max < nmp->nm_wsize && max > 0) {
nmp->nm_wsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize == 0)
nmp->nm_wsize = max;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_rtpref);
if (pref < nmp->nm_rsize && pref >= NFS_FABLKSIZE)
nmp->nm_rsize = (pref + NFS_FABLKSIZE - 1) &
~(NFS_FABLKSIZE - 1);
max = fxdr_unsigned(u_int32_t, fsp->fs_rtmax);
if (max < nmp->nm_rsize && max > 0) {
nmp->nm_rsize = max & ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize == 0)
nmp->nm_rsize = max;
}
pref = fxdr_unsigned(u_int32_t, fsp->fs_dtpref);
if (pref < nmp->nm_readdirsize && pref >= NFS_DIRBLKSIZ)
nmp->nm_readdirsize = (pref + NFS_DIRBLKSIZ - 1) &
~(NFS_DIRBLKSIZ - 1);
if (max < nmp->nm_readdirsize && max > 0) {
nmp->nm_readdirsize = max & ~(NFS_DIRBLKSIZ - 1);
if (nmp->nm_readdirsize == 0)
nmp->nm_readdirsize = max;
}
fxdr_hyper(&fsp->fs_maxfilesize, &maxfsize);
if (maxfsize > 0 && maxfsize < nmp->nm_maxfilesize)
nmp->nm_maxfilesize = maxfsize;
nmp->nm_state |= NFSSTA_GOTFSINFO;
}
nfsm_reqdone;
return (error);
}
/*
* Mount a remote root fs via. nfs. This depends on the info in the
* nfs_diskless structure that has been filled in properly by some primary
* bootstrap.
* It goes something like this:
* - do enough of "ifconfig" by calling ifioctl() so that the system
* can talk to the server
* - If nfs_diskless.mygateway is filled in, use that address as
* a default gateway.
* - build the rootfs mount point and call mountnfs() to do the rest.
*/
int
nfs_mountroot(mp)
struct mount *mp;
{
struct mount *swap_mp;
struct nfsv3_diskless *nd = &nfsv3_diskless;
struct socket *so;
struct vnode *vp;
struct proc *p = curproc; /* XXX */
int error, i;
u_long l;
char buf[128];
/*
* XXX time must be non-zero when we init the interface or else
* the arp code will wedge...
*/
while (time_second == 0)
tsleep(&time_second, PZERO+8, "arpkludge", 10);
if (nfs_diskless_valid==1)
nfs_convert_diskless();
/*
* XXX splnet, so networks will receive...
*/
splnet();
#ifdef notyet
/* Set up swap credentials. */
proc0.p_ucred->cr_uid = ntohl(nd->swap_ucred.cr_uid);
proc0.p_ucred->cr_gid = ntohl(nd->swap_ucred.cr_gid);
if ((proc0.p_ucred->cr_ngroups = ntohs(nd->swap_ucred.cr_ngroups)) >
NGROUPS)
proc0.p_ucred->cr_ngroups = NGROUPS;
for (i = 0; i < proc0.p_ucred->cr_ngroups; i++)
proc0.p_ucred->cr_groups[i] = ntohl(nd->swap_ucred.cr_groups[i]);
#endif
/*
* Do enough of ifconfig(8) so that the critical net interface can
* talk to the server.
*/
error = socreate(nd->myif.ifra_addr.sa_family, &so, SOCK_DGRAM, 0, p);
if (error)
panic("nfs_mountroot: socreate(%04x): %d",
nd->myif.ifra_addr.sa_family, error);
/*
* We might not have been told the right interface, so we pass
* over the first ten interfaces of the same kind, until we get
* one of them configured.
*/
for (i = strlen(nd->myif.ifra_name) - 1;
nd->myif.ifra_name[i] >= '0' &&
nd->myif.ifra_name[i] <= '9';
nd->myif.ifra_name[i] ++) {
error = ifioctl(so, SIOCAIFADDR, (caddr_t)&nd->myif, p);
if(!error)
break;
}
if (error)
panic("nfs_mountroot: SIOCAIFADDR: %d", error);
soclose(so);
/*
* If the gateway field is filled in, set it as the default route.
*/
if (nd->mygateway.sin_len != 0) {
struct sockaddr_in mask, sin;
bzero((caddr_t)&mask, sizeof(mask));
sin = mask;
sin.sin_family = AF_INET;
sin.sin_len = sizeof(sin);
error = rtrequest(RTM_ADD, (struct sockaddr *)&sin,
(struct sockaddr *)&nd->mygateway,
(struct sockaddr *)&mask,
RTF_UP | RTF_GATEWAY, (struct rtentry **)0);
if (error)
panic("nfs_mountroot: RTM_ADD: %d", error);
}
/*
* Create the rootfs mount point.
*/
nd->root_args.fh = nd->root_fh;
nd->root_args.fhsize = nd->root_fhsize;
l = ntohl(nd->root_saddr.sin_addr.s_addr);
snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
(l >> 24) & 0xff, (l >> 16) & 0xff,
(l >> 8) & 0xff, (l >> 0) & 0xff,nd->root_hostnam);
printf("NFS ROOT: %s\n",buf);
if (error = nfs_mountdiskless(buf, "/", MNT_RDONLY,
&nd->root_saddr, &nd->root_args, p, &vp, &mp)) {
if (swap_mp) {
mp->mnt_vfc->vfc_refcount--;
free(swap_mp, M_MOUNT);
}
return (error);
}
swap_mp = NULL;
if (nd->swap_nblks) {
/* Convert to DEV_BSIZE instead of Kilobyte */
nd->swap_nblks *= 2;
/*
* Create a fake mount point just for the swap vnode so that the
* swap file can be on a different server from the rootfs.
*/
nd->swap_args.fh = nd->swap_fh;
nd->swap_args.fhsize = nd->swap_fhsize;
l = ntohl(nd->swap_saddr.sin_addr.s_addr);
snprintf(buf, sizeof(buf), "%ld.%ld.%ld.%ld:%s",
(l >> 24) & 0xff, (l >> 16) & 0xff,
(l >> 8) & 0xff, (l >> 0) & 0xff,nd->swap_hostnam);
printf("NFS SWAP: %s\n",buf);
if (error = nfs_mountdiskless(buf, "/swap", 0,
&nd->swap_saddr, &nd->swap_args, p, &vp, &swap_mp))
return (error);
vfs_unbusy(swap_mp, p);
VTONFS(vp)->n_size = VTONFS(vp)->n_vattr.va_size =
nd->swap_nblks * DEV_BSIZE ;
/*
* Since the swap file is not the root dir of a file system,
* hack it to a regular file.
*/
vp->v_type = VREG;
vp->v_flag = 0;
VREF(vp);
swaponvp(p, vp, NODEV, nd->swap_nblks);
}
mp->mnt_flag |= MNT_ROOTFS;
mp->mnt_vnodecovered = NULLVP;
rootvp = vp;
vfs_unbusy(mp, p);
/*
* This is not really an nfs issue, but it is much easier to
* set hostname here and then let the "/etc/rc.xxx" files
* mount the right /var based upon its preset value.
*/
bcopy(nd->my_hostnam, hostname, MAXHOSTNAMELEN);
hostname[MAXHOSTNAMELEN - 1] = '\0';
for (i = 0; i < MAXHOSTNAMELEN; i++)
if (hostname[i] == '\0')
break;
inittodr(ntohl(nd->root_time));
return (0);
}
/*
* Internal version of mount system call for diskless setup.
*/
static int
nfs_mountdiskless(path, which, mountflag, sin, args, p, vpp, mpp)
char *path;
char *which;
int mountflag;
struct sockaddr_in *sin;
struct nfs_args *args;
struct proc *p;
struct vnode **vpp;
struct mount **mpp;
{
struct mount *mp;
struct sockaddr *nam;
int error;
mp = *mpp;
if (!mp && (error = vfs_rootmountalloc("nfs", path, &mp))) {
printf("nfs_mountroot: NFS not configured");
return (error);
}
mp->mnt_kern_flag = 0;
mp->mnt_flag = mountflag;
nam = dup_sockaddr((struct sockaddr *)sin, 1);
if (error = mountnfs(args, mp, nam, which, path, vpp)) {
printf("nfs_mountroot: mount %s on %s: %d", path, which, error);
mp->mnt_vfc->vfc_refcount--;
vfs_unbusy(mp, p);
free(mp, M_MOUNT);
FREE(nam, M_SONAME);
return (error);
}
(void) copystr(which, mp->mnt_stat.f_mntonname, MNAMELEN - 1, 0);
*mpp = mp;
return (0);
}
static void
nfs_decode_args(nmp, argp)
struct nfsmount *nmp;
struct nfs_args *argp;
{
int s;
int adjsock;
int maxio;
s = splnet();
/*
* Silently clear NFSMNT_NOCONN if it's a TCP mount, it makes
* no sense in that context.
*/
if (argp->sotype == SOCK_STREAM)
nmp->nm_flag &= ~NFSMNT_NOCONN;
/* Also clear RDIRPLUS if not NFSv3, it crashes some servers */
if ((argp->flags & NFSMNT_NFSV3) == 0)
nmp->nm_flag &= ~NFSMNT_RDIRPLUS;
/* Re-bind if rsrvd port requested and wasn't on one */
adjsock = !(nmp->nm_flag & NFSMNT_RESVPORT)
&& (argp->flags & NFSMNT_RESVPORT);
/* Also re-bind if we're switching to/from a connected UDP socket */
adjsock |= ((nmp->nm_flag & NFSMNT_NOCONN) !=
(argp->flags & NFSMNT_NOCONN));
/* Update flags atomically. Don't change the lock bits. */
nmp->nm_flag = argp->flags | nmp->nm_flag;
splx(s);
if ((argp->flags & NFSMNT_TIMEO) && argp->timeo > 0) {
nmp->nm_timeo = (argp->timeo * NFS_HZ + 5) / 10;
if (nmp->nm_timeo < NFS_MINTIMEO)
nmp->nm_timeo = NFS_MINTIMEO;
else if (nmp->nm_timeo > NFS_MAXTIMEO)
nmp->nm_timeo = NFS_MAXTIMEO;
}
if ((argp->flags & NFSMNT_RETRANS) && argp->retrans > 1) {
nmp->nm_retry = argp->retrans;
if (nmp->nm_retry > NFS_MAXREXMIT)
nmp->nm_retry = NFS_MAXREXMIT;
}
if (argp->flags & NFSMNT_NFSV3) {
if (argp->sotype == SOCK_DGRAM)
maxio = NFS_MAXDGRAMDATA;
else
maxio = NFS_MAXDATA;
} else
maxio = NFS_V2MAXDATA;
if ((argp->flags & NFSMNT_WSIZE) && argp->wsize > 0) {
nmp->nm_wsize = argp->wsize;
/* Round down to multiple of blocksize */
nmp->nm_wsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_wsize <= 0)
nmp->nm_wsize = NFS_FABLKSIZE;
}
if (nmp->nm_wsize > maxio)
nmp->nm_wsize = maxio;
if (nmp->nm_wsize > MAXBSIZE)
nmp->nm_wsize = MAXBSIZE;
if ((argp->flags & NFSMNT_RSIZE) && argp->rsize > 0) {
nmp->nm_rsize = argp->rsize;
/* Round down to multiple of blocksize */
nmp->nm_rsize &= ~(NFS_FABLKSIZE - 1);
if (nmp->nm_rsize <= 0)
nmp->nm_rsize = NFS_FABLKSIZE;
}
if (nmp->nm_rsize > maxio)
nmp->nm_rsize = maxio;
if (nmp->nm_rsize > MAXBSIZE)
nmp->nm_rsize = MAXBSIZE;
if ((argp->flags & NFSMNT_READDIRSIZE) && argp->readdirsize > 0) {
nmp->nm_readdirsize = argp->readdirsize;
}
if (nmp->nm_readdirsize > maxio)
nmp->nm_readdirsize = maxio;
if (nmp->nm_readdirsize > nmp->nm_rsize)
nmp->nm_readdirsize = nmp->nm_rsize;
if ((argp->flags & NFSMNT_ACREGMIN) && argp->acregmin >= 0)
nmp->nm_acregmin = argp->acregmin;
else
nmp->nm_acregmin = NFS_MINATTRTIMO;
if ((argp->flags & NFSMNT_ACREGMAX) && argp->acregmax >= 0)
nmp->nm_acregmax = argp->acregmax;
else
nmp->nm_acregmax = NFS_MAXATTRTIMO;
if ((argp->flags & NFSMNT_ACDIRMIN) && argp->acdirmin >= 0)
nmp->nm_acdirmin = argp->acdirmin;
else
nmp->nm_acdirmin = NFS_MINDIRATTRTIMO;
if ((argp->flags & NFSMNT_ACDIRMAX) && argp->acdirmax >= 0)
nmp->nm_acdirmax = argp->acdirmax;
else
nmp->nm_acdirmax = NFS_MAXDIRATTRTIMO;
if (nmp->nm_acdirmin > nmp->nm_acdirmax)
nmp->nm_acdirmin = nmp->nm_acdirmax;
if (nmp->nm_acregmin > nmp->nm_acregmax)
nmp->nm_acregmin = nmp->nm_acregmax;
if ((argp->flags & NFSMNT_MAXGRPS) && argp->maxgrouplist >= 0 &&
argp->maxgrouplist <= NFS_MAXGRPS)
nmp->nm_numgrps = argp->maxgrouplist;
if ((argp->flags & NFSMNT_READAHEAD) && argp->readahead >= 0 &&
argp->readahead <= NFS_MAXRAHEAD)
nmp->nm_readahead = argp->readahead;
if ((argp->flags & NFSMNT_LEASETERM) && argp->leaseterm >= 2 &&
argp->leaseterm <= NQ_MAXLEASE)
nmp->nm_leaseterm = argp->leaseterm;
if ((argp->flags & NFSMNT_DEADTHRESH) && argp->deadthresh >= 1 &&
argp->deadthresh <= NQ_NEVERDEAD)
nmp->nm_deadthresh = argp->deadthresh;
adjsock |= ((nmp->nm_sotype != argp->sotype) ||
(nmp->nm_soproto != argp->proto));
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
if (nmp->nm_so && adjsock) {
nfs_safedisconnect(nmp);
if (nmp->nm_sotype == SOCK_DGRAM)
while (nfs_connect(nmp, (struct nfsreq *)0)) {
printf("nfs_args: retrying connect\n");
(void) tsleep((caddr_t)&lbolt,
PSOCK, "nfscon", 0);
}
}
}
/*
* VFS Operations.
*
* mount system call
* It seems a bit dumb to copyinstr() the host and path here and then
* bcopy() them in mountnfs(), but I wanted to detect errors before
* doing the sockargs() call because sockargs() allocates an mbuf and
* an error after that means that I have to release the mbuf.
*/
/* ARGSUSED */
static int
nfs_mount(mp, path, data, ndp, p)
struct mount *mp;
char *path;
caddr_t data;
struct nameidata *ndp;
struct proc *p;
{
int error;
struct nfs_args args;
struct sockaddr *nam;
struct vnode *vp;
char pth[MNAMELEN], hst[MNAMELEN];
size_t len;
u_char nfh[NFSX_V3FHMAX];
if (path == NULL) {
nfs_mountroot(mp);
return (0);
}
error = copyin(data, (caddr_t)&args, sizeof (struct nfs_args));
if (error)
return (error);
if (args.version != NFS_ARGSVERSION) {
#ifdef COMPAT_PRELITE2
/*
* If the argument version is unknown, then assume the
* caller is a pre-lite2 4.4BSD client and convert its
* arguments.
*/
struct onfs_args oargs;
error = copyin(data, (caddr_t)&oargs, sizeof (struct onfs_args));
if (error)
return (error);
nfs_convert_oargs(&args,&oargs);
#else /* !COMPAT_PRELITE2 */
return (EPROGMISMATCH);
#endif /* COMPAT_PRELITE2 */
}
if (mp->mnt_flag & MNT_UPDATE) {
register struct nfsmount *nmp = VFSTONFS(mp);
if (nmp == NULL)
return (EIO);
/*
* When doing an update, we can't change from or to
* v3 and/or nqnfs, or change cookie translation
*/
args.flags = (args.flags &
~(NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/)) |
(nmp->nm_flag &
(NFSMNT_NFSV3|NFSMNT_NQNFS /*|NFSMNT_XLATECOOKIE*/));
nfs_decode_args(nmp, &args);
return (0);
}
error = copyin((caddr_t)args.fh, (caddr_t)nfh, args.fhsize);
if (error)
return (error);
error = copyinstr(path, pth, MNAMELEN-1, &len);
if (error)
return (error);
bzero(&pth[len], MNAMELEN - len);
error = copyinstr(args.hostname, hst, MNAMELEN-1, &len);
if (error)
return (error);
bzero(&hst[len], MNAMELEN - len);
/* sockargs() call must be after above copyin() calls */
error = getsockaddr(&nam, (caddr_t)args.addr, args.addrlen);
if (error)
return (error);
args.fh = nfh;
error = mountnfs(&args, mp, nam, pth, hst, &vp);
return (error);
}
/*
* Common code for mount and mountroot
*/
static int
mountnfs(argp, mp, nam, pth, hst, vpp)
register struct nfs_args *argp;
register struct mount *mp;
struct sockaddr *nam;
char *pth, *hst;
struct vnode **vpp;
{
register struct nfsmount *nmp;
struct nfsnode *np;
int error;
struct vattr attrs;
if (mp->mnt_flag & MNT_UPDATE) {
nmp = VFSTONFS(mp);
/* update paths, file handles, etc, here XXX */
FREE(nam, M_SONAME);
return (0);
} else {
nmp = zalloc(nfsmount_zone);
bzero((caddr_t)nmp, sizeof (struct nfsmount));
TAILQ_INIT(&nmp->nm_uidlruhead);
TAILQ_INIT(&nmp->nm_bufq);
mp->mnt_data = (qaddr_t)nmp;
}
vfs_getnewfsid(mp);
nmp->nm_mountp = mp;
if (argp->flags & NFSMNT_NQNFS)
/*
* We have to set mnt_maxsymlink to a non-zero value so
* that COMPAT_43 routines will know that we are setting
* the d_type field in directories (and can zero it for
* unsuspecting binaries).
*/
mp->mnt_maxsymlinklen = 1;
/*
* V2 can only handle 32 bit filesizes. A 4GB-1 limit may be too
* high, depending on whether we end up with negative offsets in
* the client or server somewhere. 2GB-1 may be safer.
*
* For V3, nfs_fsinfo will adjust this as necessary. Assume maximum
* that we can handle until we find out otherwise.
* XXX Our "safe" limit on the client is what we can store in our
* buffer cache using signed(!) block numbers.
*/
if ((argp->flags & NFSMNT_NFSV3) == 0)
nmp->nm_maxfilesize = 0xffffffffLL;
else
nmp->nm_maxfilesize = (u_int64_t)0x80000000 * DEV_BSIZE - 1;
nmp->nm_timeo = NFS_TIMEO;
nmp->nm_retry = NFS_RETRANS;
nmp->nm_wsize = NFS_WSIZE;
nmp->nm_rsize = NFS_RSIZE;
nmp->nm_readdirsize = NFS_READDIRSIZE;
nmp->nm_numgrps = NFS_MAXGRPS;
nmp->nm_readahead = NFS_DEFRAHEAD;
nmp->nm_leaseterm = NQ_DEFLEASE;
nmp->nm_deadthresh = NQ_DEADTHRESH;
CIRCLEQ_INIT(&nmp->nm_timerhead);
nmp->nm_inprog = NULLVP;
nmp->nm_fhsize = argp->fhsize;
bcopy((caddr_t)argp->fh, (caddr_t)nmp->nm_fh, argp->fhsize);
bcopy(hst, mp->mnt_stat.f_mntfromname, MNAMELEN);
bcopy(pth, mp->mnt_stat.f_mntonname, MNAMELEN);
nmp->nm_nam = nam;
/* Set up the sockets and per-host congestion */
nmp->nm_sotype = argp->sotype;
nmp->nm_soproto = argp->proto;
nfs_decode_args(nmp, argp);
/*
* For Connection based sockets (TCP,...) defer the connect until
* the first request, in case the server is not responding.
*/
if (nmp->nm_sotype == SOCK_DGRAM &&
(error = nfs_connect(nmp, (struct nfsreq *)0)))
goto bad;
/*
* This is silly, but it has to be set so that vinifod() works.
* We do not want to do an nfs_statfs() here since we can get
* stuck on a dead server and we are holding a lock on the mount
* point.
*/
mp->mnt_stat.f_iosize = nfs_iosize(nmp);
/*
* A reference count is needed on the nfsnode representing the
* remote root. If this object is not persistent, then backward
* traversals of the mount point (i.e. "..") will not work if
* the nfsnode gets flushed out of the cache. Ufs does not have
* this problem, because one can identify root inodes by their
* number == ROOTINO (2).
*/
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
goto bad;
*vpp = NFSTOV(np);
/*
* Get file attributes for the mountpoint. This has the side
* effect of filling in (*vpp)->v_type with the correct value.
*/
VOP_GETATTR(*vpp, &attrs, curproc->p_ucred, curproc);
/*
* Lose the lock but keep the ref.
*/
VOP_UNLOCK(*vpp, 0, curproc);
return (0);
bad:
nfs_disconnect(nmp);
zfree(nfsmount_zone, nmp);
FREE(nam, M_SONAME);
return (error);
}
/*
* unmount system call
*/
static int
nfs_unmount(mp, mntflags, p)
struct mount *mp;
int mntflags;
struct proc *p;
{
register struct nfsmount *nmp;
struct nfsnode *np;
struct vnode *vp;
int error, flags = 0;
if (mntflags & MNT_FORCE)
flags |= FORCECLOSE;
nmp = VFSTONFS(mp);
/*
* Goes something like this..
* - Check for activity on the root vnode (other than ourselves).
* - Call vflush() to clear out vnodes for this file system,
* except for the root vnode.
* - Decrement reference on the vnode representing remote root.
* - Close the socket
* - Free up the data structures
*/
/*
* We need to decrement the ref. count on the nfsnode representing
* the remote root. See comment in mountnfs(). The VFS unmount()
* has done vput on this vnode, otherwise we would get deadlock!
*/
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
return(error);
vp = NFSTOV(np);
if (vp->v_usecount > 2) {
vput(vp);
return (EBUSY);
}
/*
* Must handshake with nqnfs_clientd() if it is active.
*/
nmp->nm_state |= NFSSTA_DISMINPROG;
while (nmp->nm_inprog != NULLVP)
(void) tsleep((caddr_t)&lbolt, PSOCK, "nfsdism", 0);
error = vflush(mp, vp, flags);
if (error) {
vput(vp);
nmp->nm_state &= ~NFSSTA_DISMINPROG;
return (error);
}
/*
* We are now committed to the unmount.
* For NQNFS, let the server daemon free the nfsmount structure.
*/
if (nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB))
nmp->nm_state |= NFSSTA_DISMNT;
/*
* There are two reference counts and one lock to get rid of here.
*/
vput(vp);
vrele(vp);
vgone(vp);
nfs_disconnect(nmp);
FREE(nmp->nm_nam, M_SONAME);
if ((nmp->nm_flag & (NFSMNT_NQNFS | NFSMNT_KERB)) == 0)
zfree(nfsmount_zone, nmp);
return (0);
}
/*
* Return root of a filesystem
*/
static int
nfs_root(mp, vpp)
struct mount *mp;
struct vnode **vpp;
{
register struct vnode *vp;
struct nfsmount *nmp;
struct nfsnode *np;
int error;
nmp = VFSTONFS(mp);
error = nfs_nget(mp, (nfsfh_t *)nmp->nm_fh, nmp->nm_fhsize, &np);
if (error)
return (error);
vp = NFSTOV(np);
if (vp->v_type == VNON)
vp->v_type = VDIR;
vp->v_flag = VROOT;
*vpp = vp;
return (0);
}
extern int syncprt;
/*
* Flush out the buffer cache
*/
/* ARGSUSED */
static int
nfs_sync(mp, waitfor, cred, p)
struct mount *mp;
int waitfor;
struct ucred *cred;
struct proc *p;
{
register struct vnode *vp;
int error, allerror = 0;
/*
* Force stale buffer cache information to be flushed.
*/
loop:
for (vp = mp->mnt_vnodelist.lh_first;
vp != NULL;
vp = vp->v_mntvnodes.le_next) {
/*
* If the vnode that we are about to sync is no longer
* associated with this mount point, start over.
*/
if (vp->v_mount != mp)
goto loop;
if (VOP_ISLOCKED(vp) || TAILQ_EMPTY(&vp->v_dirtyblkhd) ||
waitfor == MNT_LAZY)
continue;
if (vget(vp, LK_EXCLUSIVE, p))
goto loop;
error = VOP_FSYNC(vp, cred, waitfor, p);
if (error)
allerror = error;
vput(vp);
}
return (allerror);
}
/*
* NFS flat namespace lookup.
* Currently unsupported.
*/
/* ARGSUSED */
static int
nfs_vget(mp, ino, vpp)
struct mount *mp;
ino_t ino;
struct vnode **vpp;
{
return (EOPNOTSUPP);
}
/*
* At this point, this should never happen
*/
/* ARGSUSED */
static int
nfs_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
register struct mount *mp;
struct fid *fhp;
struct sockaddr *nam;
struct vnode **vpp;
int *exflagsp;
struct ucred **credanonp;
{
return (EINVAL);
}
/*
* Vnode pointer to File handle, should never happen either
*/
/* ARGSUSED */
static int
nfs_vptofh(vp, fhp)
struct vnode *vp;
struct fid *fhp;
{
return (EINVAL);
}
/*
* Vfs start routine, a no-op.
*/
/* ARGSUSED */
static int
nfs_start(mp, flags, p)
struct mount *mp;
int flags;
struct proc *p;
{
return (0);
}
/*
* Do operations associated with quotas, not supported
*/
/* ARGSUSED */
static int
nfs_quotactl(mp, cmd, uid, arg, p)
struct mount *mp;
int cmd;
uid_t uid;
caddr_t arg;
struct proc *p;
{
return (EOPNOTSUPP);
}
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