570 lines
13 KiB
C
570 lines
13 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* XDR support for nfsd
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*
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* Copyright (C) 1995, 1996 Olaf Kirch <okir@monad.swb.de>
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*/
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#include "vfs.h"
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#include "xdr.h"
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#include "auth.h"
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#define NFSDDBG_FACILITY NFSDDBG_XDR
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/*
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* Mapping of S_IF* types to NFS file types
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*/
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static u32 nfs_ftypes[] = {
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NFNON, NFCHR, NFCHR, NFBAD,
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NFDIR, NFBAD, NFBLK, NFBAD,
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NFREG, NFBAD, NFLNK, NFBAD,
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NFSOCK, NFBAD, NFLNK, NFBAD,
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};
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/*
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* XDR functions for basic NFS types
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*/
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static __be32 *
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decode_fh(__be32 *p, struct svc_fh *fhp)
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{
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fh_init(fhp, NFS_FHSIZE);
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memcpy(&fhp->fh_handle.fh_base, p, NFS_FHSIZE);
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fhp->fh_handle.fh_size = NFS_FHSIZE;
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/* FIXME: Look up export pointer here and verify
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* Sun Secure RPC if requested */
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return p + (NFS_FHSIZE >> 2);
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}
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/* Helper function for NFSv2 ACL code */
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__be32 *nfs2svc_decode_fh(__be32 *p, struct svc_fh *fhp)
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{
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return decode_fh(p, fhp);
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}
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static __be32 *
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encode_fh(__be32 *p, struct svc_fh *fhp)
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{
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memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE);
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return p + (NFS_FHSIZE>> 2);
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}
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/*
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* Decode a file name and make sure that the path contains
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* no slashes or null bytes.
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*/
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static __be32 *
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decode_filename(__be32 *p, char **namp, unsigned int *lenp)
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{
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char *name;
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unsigned int i;
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if ((p = xdr_decode_string_inplace(p, namp, lenp, NFS_MAXNAMLEN)) != NULL) {
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for (i = 0, name = *namp; i < *lenp; i++, name++) {
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if (*name == '\0' || *name == '/')
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return NULL;
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}
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}
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return p;
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}
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static __be32 *
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decode_sattr(__be32 *p, struct iattr *iap)
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{
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u32 tmp, tmp1;
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iap->ia_valid = 0;
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/* Sun client bug compatibility check: some sun clients seem to
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* put 0xffff in the mode field when they mean 0xffffffff.
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* Quoting the 4.4BSD nfs server code: Nah nah nah nah na nah.
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*/
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if ((tmp = ntohl(*p++)) != (u32)-1 && tmp != 0xffff) {
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iap->ia_valid |= ATTR_MODE;
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iap->ia_mode = tmp;
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}
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if ((tmp = ntohl(*p++)) != (u32)-1) {
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iap->ia_uid = make_kuid(&init_user_ns, tmp);
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if (uid_valid(iap->ia_uid))
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iap->ia_valid |= ATTR_UID;
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}
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if ((tmp = ntohl(*p++)) != (u32)-1) {
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iap->ia_gid = make_kgid(&init_user_ns, tmp);
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if (gid_valid(iap->ia_gid))
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iap->ia_valid |= ATTR_GID;
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}
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if ((tmp = ntohl(*p++)) != (u32)-1) {
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iap->ia_valid |= ATTR_SIZE;
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iap->ia_size = tmp;
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}
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tmp = ntohl(*p++); tmp1 = ntohl(*p++);
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if (tmp != (u32)-1 && tmp1 != (u32)-1) {
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iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET;
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iap->ia_atime.tv_sec = tmp;
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iap->ia_atime.tv_nsec = tmp1 * 1000;
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}
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tmp = ntohl(*p++); tmp1 = ntohl(*p++);
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if (tmp != (u32)-1 && tmp1 != (u32)-1) {
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iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET;
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iap->ia_mtime.tv_sec = tmp;
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iap->ia_mtime.tv_nsec = tmp1 * 1000;
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/*
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* Passing the invalid value useconds=1000000 for mtime
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* is a Sun convention for "set both mtime and atime to
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* current server time". It's needed to make permissions
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* checks for the "touch" program across v2 mounts to
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* Solaris and Irix boxes work correctly. See description of
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* sattr in section 6.1 of "NFS Illustrated" by
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* Brent Callaghan, Addison-Wesley, ISBN 0-201-32750-5
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*/
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if (tmp1 == 1000000)
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iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET);
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}
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return p;
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}
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static __be32 *
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encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp,
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struct kstat *stat)
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{
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struct dentry *dentry = fhp->fh_dentry;
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int type;
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struct timespec64 time;
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u32 f;
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type = (stat->mode & S_IFMT);
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*p++ = htonl(nfs_ftypes[type >> 12]);
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*p++ = htonl((u32) stat->mode);
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*p++ = htonl((u32) stat->nlink);
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*p++ = htonl((u32) from_kuid(&init_user_ns, stat->uid));
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*p++ = htonl((u32) from_kgid(&init_user_ns, stat->gid));
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if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) {
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*p++ = htonl(NFS_MAXPATHLEN);
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} else {
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*p++ = htonl((u32) stat->size);
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}
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*p++ = htonl((u32) stat->blksize);
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if (S_ISCHR(type) || S_ISBLK(type))
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*p++ = htonl(new_encode_dev(stat->rdev));
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else
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*p++ = htonl(0xffffffff);
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*p++ = htonl((u32) stat->blocks);
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switch (fsid_source(fhp)) {
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default:
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case FSIDSOURCE_DEV:
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*p++ = htonl(new_encode_dev(stat->dev));
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break;
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case FSIDSOURCE_FSID:
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*p++ = htonl((u32) fhp->fh_export->ex_fsid);
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break;
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case FSIDSOURCE_UUID:
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f = ((u32*)fhp->fh_export->ex_uuid)[0];
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f ^= ((u32*)fhp->fh_export->ex_uuid)[1];
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f ^= ((u32*)fhp->fh_export->ex_uuid)[2];
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f ^= ((u32*)fhp->fh_export->ex_uuid)[3];
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*p++ = htonl(f);
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break;
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}
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*p++ = htonl((u32) stat->ino);
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*p++ = htonl((u32) stat->atime.tv_sec);
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*p++ = htonl(stat->atime.tv_nsec ? stat->atime.tv_nsec / 1000 : 0);
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time = stat->mtime;
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lease_get_mtime(d_inode(dentry), &time);
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*p++ = htonl((u32) time.tv_sec);
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*p++ = htonl(time.tv_nsec ? time.tv_nsec / 1000 : 0);
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*p++ = htonl((u32) stat->ctime.tv_sec);
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*p++ = htonl(stat->ctime.tv_nsec ? stat->ctime.tv_nsec / 1000 : 0);
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return p;
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}
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/* Helper function for NFSv2 ACL code */
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__be32 *nfs2svc_encode_fattr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat)
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{
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return encode_fattr(rqstp, p, fhp, stat);
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}
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/*
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* XDR decode functions
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*/
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int
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nfssvc_decode_void(struct svc_rqst *rqstp, __be32 *p)
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{
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_fhandle(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_fhandle *args = rqstp->rq_argp;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_sattrargs *args = rqstp->rq_argp;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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p = decode_sattr(p, &args->attrs);
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_diropargs *args = rqstp->rq_argp;
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if (!(p = decode_fh(p, &args->fh))
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|| !(p = decode_filename(p, &args->name, &args->len)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_readargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_readargs *args = rqstp->rq_argp;
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unsigned int len;
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int v;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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args->offset = ntohl(*p++);
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len = args->count = ntohl(*p++);
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p++; /* totalcount - unused */
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len = min_t(unsigned int, len, NFSSVC_MAXBLKSIZE_V2);
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/* set up somewhere to store response.
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* We take pages, put them on reslist and include in iovec
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*/
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v=0;
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while (len > 0) {
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struct page *p = *(rqstp->rq_next_page++);
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rqstp->rq_vec[v].iov_base = page_address(p);
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rqstp->rq_vec[v].iov_len = min_t(unsigned int, len, PAGE_SIZE);
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len -= rqstp->rq_vec[v].iov_len;
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v++;
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}
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args->vlen = v;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_writeargs *args = rqstp->rq_argp;
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unsigned int len, hdr, dlen;
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struct kvec *head = rqstp->rq_arg.head;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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p++; /* beginoffset */
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args->offset = ntohl(*p++); /* offset */
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p++; /* totalcount */
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len = args->len = ntohl(*p++);
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/*
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* The protocol specifies a maximum of 8192 bytes.
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*/
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if (len > NFSSVC_MAXBLKSIZE_V2)
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return 0;
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/*
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* Check to make sure that we got the right number of
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* bytes.
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*/
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hdr = (void*)p - head->iov_base;
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if (hdr > head->iov_len)
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return 0;
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dlen = head->iov_len + rqstp->rq_arg.page_len - hdr;
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/*
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* Round the length of the data which was specified up to
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* the next multiple of XDR units and then compare that
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* against the length which was actually received.
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* Note that when RPCSEC/GSS (for example) is used, the
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* data buffer can be padded so dlen might be larger
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* than required. It must never be smaller.
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*/
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if (dlen < XDR_QUADLEN(len)*4)
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return 0;
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args->first.iov_base = (void *)p;
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args->first.iov_len = head->iov_len - hdr;
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return 1;
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}
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int
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nfssvc_decode_createargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_createargs *args = rqstp->rq_argp;
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if ( !(p = decode_fh(p, &args->fh))
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|| !(p = decode_filename(p, &args->name, &args->len)))
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return 0;
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p = decode_sattr(p, &args->attrs);
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_renameargs *args = rqstp->rq_argp;
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if (!(p = decode_fh(p, &args->ffh))
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|| !(p = decode_filename(p, &args->fname, &args->flen))
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|| !(p = decode_fh(p, &args->tfh))
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|| !(p = decode_filename(p, &args->tname, &args->tlen)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_readlinkargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_readlinkargs *args = rqstp->rq_argp;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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args->buffer = page_address(*(rqstp->rq_next_page++));
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_linkargs *args = rqstp->rq_argp;
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if (!(p = decode_fh(p, &args->ffh))
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|| !(p = decode_fh(p, &args->tfh))
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|| !(p = decode_filename(p, &args->tname, &args->tlen)))
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return 0;
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return xdr_argsize_check(rqstp, p);
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}
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int
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nfssvc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_symlinkargs *args = rqstp->rq_argp;
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char *base = (char *)p;
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size_t xdrlen;
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if ( !(p = decode_fh(p, &args->ffh))
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|| !(p = decode_filename(p, &args->fname, &args->flen)))
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return 0;
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args->tlen = ntohl(*p++);
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if (args->tlen == 0)
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return 0;
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args->first.iov_base = p;
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args->first.iov_len = rqstp->rq_arg.head[0].iov_len;
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args->first.iov_len -= (char *)p - base;
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/* This request is never larger than a page. Therefore,
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* transport will deliver either:
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* 1. pathname in the pagelist -> sattr is in the tail.
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* 2. everything in the head buffer -> sattr is in the head.
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*/
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if (rqstp->rq_arg.page_len) {
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if (args->tlen != rqstp->rq_arg.page_len)
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return 0;
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p = rqstp->rq_arg.tail[0].iov_base;
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} else {
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xdrlen = XDR_QUADLEN(args->tlen);
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if (xdrlen > args->first.iov_len - (8 * sizeof(__be32)))
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return 0;
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p += xdrlen;
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}
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decode_sattr(p, &args->attrs);
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return 1;
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}
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int
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nfssvc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_readdirargs *args = rqstp->rq_argp;
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p = decode_fh(p, &args->fh);
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if (!p)
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return 0;
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args->cookie = ntohl(*p++);
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args->count = ntohl(*p++);
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args->count = min_t(u32, args->count, PAGE_SIZE);
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args->buffer = page_address(*(rqstp->rq_next_page++));
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return xdr_argsize_check(rqstp, p);
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}
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/*
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* XDR encode functions
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*/
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int
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nfssvc_encode_void(struct svc_rqst *rqstp, __be32 *p)
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{
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return xdr_ressize_check(rqstp, p);
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}
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int
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nfssvc_encode_attrstat(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_attrstat *resp = rqstp->rq_resp;
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p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
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return xdr_ressize_check(rqstp, p);
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}
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int
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nfssvc_encode_diropres(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_diropres *resp = rqstp->rq_resp;
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p = encode_fh(p, &resp->fh);
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p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
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return xdr_ressize_check(rqstp, p);
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}
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int
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nfssvc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_readlinkres *resp = rqstp->rq_resp;
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*p++ = htonl(resp->len);
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xdr_ressize_check(rqstp, p);
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rqstp->rq_res.page_len = resp->len;
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if (resp->len & 3) {
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/* need to pad the tail */
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rqstp->rq_res.tail[0].iov_base = p;
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*p = 0;
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rqstp->rq_res.tail[0].iov_len = 4 - (resp->len&3);
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}
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return 1;
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}
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int
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nfssvc_encode_readres(struct svc_rqst *rqstp, __be32 *p)
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{
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struct nfsd_readres *resp = rqstp->rq_resp;
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p = encode_fattr(rqstp, p, &resp->fh, &resp->stat);
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*p++ = htonl(resp->count);
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xdr_ressize_check(rqstp, p);
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/* now update rqstp->rq_res to reflect data as well */
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rqstp->rq_res.page_len = resp->count;
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if (resp->count & 3) {
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/* need to pad the tail */
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rqstp->rq_res.tail[0].iov_base = p;
|
|
*p = 0;
|
|
rqstp->rq_res.tail[0].iov_len = 4 - (resp->count&3);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
nfssvc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd_readdirres *resp = rqstp->rq_resp;
|
|
|
|
xdr_ressize_check(rqstp, p);
|
|
p = resp->buffer;
|
|
*p++ = 0; /* no more entries */
|
|
*p++ = htonl((resp->common.err == nfserr_eof));
|
|
rqstp->rq_res.page_len = (((unsigned long)p-1) & ~PAGE_MASK)+1;
|
|
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p)
|
|
{
|
|
struct nfsd_statfsres *resp = rqstp->rq_resp;
|
|
struct kstatfs *stat = &resp->stats;
|
|
|
|
*p++ = htonl(NFSSVC_MAXBLKSIZE_V2); /* max transfer size */
|
|
*p++ = htonl(stat->f_bsize);
|
|
*p++ = htonl(stat->f_blocks);
|
|
*p++ = htonl(stat->f_bfree);
|
|
*p++ = htonl(stat->f_bavail);
|
|
return xdr_ressize_check(rqstp, p);
|
|
}
|
|
|
|
int
|
|
nfssvc_encode_entry(void *ccdv, const char *name,
|
|
int namlen, loff_t offset, u64 ino, unsigned int d_type)
|
|
{
|
|
struct readdir_cd *ccd = ccdv;
|
|
struct nfsd_readdirres *cd = container_of(ccd, struct nfsd_readdirres, common);
|
|
__be32 *p = cd->buffer;
|
|
int buflen, slen;
|
|
|
|
/*
|
|
dprintk("nfsd: entry(%.*s off %ld ino %ld)\n",
|
|
namlen, name, offset, ino);
|
|
*/
|
|
|
|
if (offset > ~((u32) 0)) {
|
|
cd->common.err = nfserr_fbig;
|
|
return -EINVAL;
|
|
}
|
|
if (cd->offset)
|
|
*cd->offset = htonl(offset);
|
|
|
|
/* truncate filename */
|
|
namlen = min(namlen, NFS2_MAXNAMLEN);
|
|
slen = XDR_QUADLEN(namlen);
|
|
|
|
if ((buflen = cd->buflen - slen - 4) < 0) {
|
|
cd->common.err = nfserr_toosmall;
|
|
return -EINVAL;
|
|
}
|
|
if (ino > ~((u32) 0)) {
|
|
cd->common.err = nfserr_fbig;
|
|
return -EINVAL;
|
|
}
|
|
*p++ = xdr_one; /* mark entry present */
|
|
*p++ = htonl((u32) ino); /* file id */
|
|
p = xdr_encode_array(p, name, namlen);/* name length & name */
|
|
cd->offset = p; /* remember pointer */
|
|
*p++ = htonl(~0U); /* offset of next entry */
|
|
|
|
cd->buflen = buflen;
|
|
cd->buffer = p;
|
|
cd->common.err = nfs_ok;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* XDR release functions
|
|
*/
|
|
void
|
|
nfssvc_release_fhandle(struct svc_rqst *rqstp)
|
|
{
|
|
struct nfsd_fhandle *resp = rqstp->rq_resp;
|
|
|
|
fh_put(&resp->fh);
|
|
}
|