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685 lines
16 KiB
685 lines
16 KiB
// 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 <[email protected]> |
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*/ |
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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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|
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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 const 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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* Basic NFSv2 data types (RFC 1094 Section 2.3) |
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*/ |
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/** |
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* svcxdr_encode_stat - Encode an NFSv2 status code |
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* @xdr: XDR stream |
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* @status: status value to encode |
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* |
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* Return values: |
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* %false: Send buffer space was exhausted |
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* %true: Success |
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*/ |
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bool |
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svcxdr_encode_stat(struct xdr_stream *xdr, __be32 status) |
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{ |
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__be32 *p; |
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p = xdr_reserve_space(xdr, sizeof(status)); |
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if (!p) |
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return false; |
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*p = status; |
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return true; |
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} |
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/** |
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* svcxdr_decode_fhandle - Decode an NFSv2 file handle |
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* @xdr: XDR stream positioned at an encoded NFSv2 FH |
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* @fhp: OUT: filled-in server file handle |
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* |
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* Return values: |
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* %false: The encoded file handle was not valid |
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* %true: @fhp has been initialized |
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*/ |
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bool |
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svcxdr_decode_fhandle(struct xdr_stream *xdr, struct svc_fh *fhp) |
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{ |
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__be32 *p; |
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p = xdr_inline_decode(xdr, NFS_FHSIZE); |
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if (!p) |
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return false; |
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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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return true; |
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} |
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static bool |
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svcxdr_encode_fhandle(struct xdr_stream *xdr, const struct svc_fh *fhp) |
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{ |
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__be32 *p; |
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p = xdr_reserve_space(xdr, NFS_FHSIZE); |
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if (!p) |
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return false; |
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memcpy(p, &fhp->fh_handle.fh_base, NFS_FHSIZE); |
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return true; |
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} |
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static __be32 * |
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encode_timeval(__be32 *p, const struct timespec64 *time) |
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{ |
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*p++ = cpu_to_be32((u32)time->tv_sec); |
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if (time->tv_nsec) |
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*p++ = cpu_to_be32(time->tv_nsec / NSEC_PER_USEC); |
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else |
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*p++ = xdr_zero; |
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return p; |
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} |
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static bool |
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svcxdr_decode_filename(struct xdr_stream *xdr, char **name, unsigned int *len) |
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{ |
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u32 size, i; |
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__be32 *p; |
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char *c; |
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if (xdr_stream_decode_u32(xdr, &size) < 0) |
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return false; |
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if (size == 0 || size > NFS_MAXNAMLEN) |
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return false; |
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p = xdr_inline_decode(xdr, size); |
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if (!p) |
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return false; |
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*len = size; |
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*name = (char *)p; |
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for (i = 0, c = *name; i < size; i++, c++) |
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if (*c == '\0' || *c == '/') |
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return false; |
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return true; |
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} |
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static bool |
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svcxdr_decode_diropargs(struct xdr_stream *xdr, struct svc_fh *fhp, |
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char **name, unsigned int *len) |
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{ |
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return svcxdr_decode_fhandle(xdr, fhp) && |
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svcxdr_decode_filename(xdr, name, len); |
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} |
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static bool |
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svcxdr_decode_sattr(struct svc_rqst *rqstp, struct xdr_stream *xdr, |
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struct iattr *iap) |
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{ |
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u32 tmp1, tmp2; |
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__be32 *p; |
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p = xdr_inline_decode(xdr, XDR_UNIT * 8); |
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if (!p) |
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return false; |
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iap->ia_valid = 0; |
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/* |
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* Some Sun clients put 0xffff in the mode field when they |
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* mean 0xffffffff. |
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*/ |
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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1 && tmp1 != 0xffff) { |
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iap->ia_valid |= ATTR_MODE; |
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iap->ia_mode = tmp1; |
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} |
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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1) { |
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iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), tmp1); |
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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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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1) { |
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iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), tmp1); |
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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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tmp1 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1) { |
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iap->ia_valid |= ATTR_SIZE; |
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iap->ia_size = tmp1; |
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} |
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tmp1 = be32_to_cpup(p++); |
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tmp2 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1 && tmp2 != (u32)-1) { |
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iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; |
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iap->ia_atime.tv_sec = tmp1; |
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iap->ia_atime.tv_nsec = tmp2 * NSEC_PER_USEC; |
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} |
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tmp1 = be32_to_cpup(p++); |
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tmp2 = be32_to_cpup(p++); |
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if (tmp1 != (u32)-1 && tmp2 != (u32)-1) { |
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iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; |
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iap->ia_mtime.tv_sec = tmp1; |
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iap->ia_mtime.tv_nsec = tmp2 * NSEC_PER_USEC; |
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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 (tmp2 == 1000000) |
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iap->ia_valid &= ~(ATTR_ATIME_SET|ATTR_MTIME_SET); |
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} |
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return true; |
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} |
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/** |
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* svcxdr_encode_fattr - Encode NFSv2 file attributes |
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* @rqstp: Context of a completed RPC transaction |
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* @xdr: XDR stream |
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* @fhp: File handle to encode |
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* @stat: Attributes to encode |
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* |
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* Return values: |
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* %false: Send buffer space was exhausted |
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* %true: Success |
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*/ |
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bool |
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svcxdr_encode_fattr(struct svc_rqst *rqstp, struct xdr_stream *xdr, |
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const struct svc_fh *fhp, const struct kstat *stat) |
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{ |
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struct user_namespace *userns = nfsd_user_namespace(rqstp); |
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struct dentry *dentry = fhp->fh_dentry; |
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int type = stat->mode & S_IFMT; |
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struct timespec64 time; |
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__be32 *p; |
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u32 fsid; |
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p = xdr_reserve_space(xdr, XDR_UNIT * 17); |
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if (!p) |
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return false; |
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*p++ = cpu_to_be32(nfs_ftypes[type >> 12]); |
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*p++ = cpu_to_be32((u32)stat->mode); |
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*p++ = cpu_to_be32((u32)stat->nlink); |
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*p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid)); |
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*p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid)); |
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if (S_ISLNK(type) && stat->size > NFS_MAXPATHLEN) |
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*p++ = cpu_to_be32(NFS_MAXPATHLEN); |
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else |
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*p++ = cpu_to_be32((u32) stat->size); |
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*p++ = cpu_to_be32((u32) stat->blksize); |
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if (S_ISCHR(type) || S_ISBLK(type)) |
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*p++ = cpu_to_be32(new_encode_dev(stat->rdev)); |
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else |
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*p++ = cpu_to_be32(0xffffffff); |
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*p++ = cpu_to_be32((u32)stat->blocks); |
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switch (fsid_source(fhp)) { |
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case FSIDSOURCE_FSID: |
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fsid = (u32)fhp->fh_export->ex_fsid; |
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break; |
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case FSIDSOURCE_UUID: |
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fsid = ((u32 *)fhp->fh_export->ex_uuid)[0]; |
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fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[1]; |
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fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[2]; |
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fsid ^= ((u32 *)fhp->fh_export->ex_uuid)[3]; |
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break; |
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default: |
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fsid = new_encode_dev(stat->dev); |
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break; |
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} |
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*p++ = cpu_to_be32(fsid); |
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*p++ = cpu_to_be32((u32)stat->ino); |
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p = encode_timeval(p, &stat->atime); |
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time = stat->mtime; |
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lease_get_mtime(d_inode(dentry), &time); |
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p = encode_timeval(p, &time); |
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encode_timeval(p, &stat->ctime); |
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return true; |
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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_fhandleargs(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_fhandle *args = rqstp->rq_argp; |
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return svcxdr_decode_fhandle(xdr, &args->fh); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_sattrargs *args = rqstp->rq_argp; |
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return svcxdr_decode_fhandle(xdr, &args->fh) && |
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svcxdr_decode_sattr(rqstp, xdr, &args->attrs); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_diropargs *args = rqstp->rq_argp; |
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return svcxdr_decode_diropargs(xdr, &args->fh, &args->name, &args->len); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_readargs *args = rqstp->rq_argp; |
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u32 totalcount; |
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if (!svcxdr_decode_fhandle(xdr, &args->fh)) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->offset) < 0) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->count) < 0) |
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return 0; |
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/* totalcount is ignored */ |
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if (xdr_stream_decode_u32(xdr, &totalcount) < 0) |
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return 0; |
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return 1; |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_writeargs *args = rqstp->rq_argp; |
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struct kvec *head = rqstp->rq_arg.head; |
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struct kvec *tail = rqstp->rq_arg.tail; |
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u32 beginoffset, totalcount; |
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size_t remaining; |
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if (!svcxdr_decode_fhandle(xdr, &args->fh)) |
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return 0; |
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/* beginoffset is ignored */ |
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if (xdr_stream_decode_u32(xdr, &beginoffset) < 0) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->offset) < 0) |
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return 0; |
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/* totalcount is ignored */ |
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if (xdr_stream_decode_u32(xdr, &totalcount) < 0) |
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return 0; |
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/* opaque data */ |
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if (xdr_stream_decode_u32(xdr, &args->len) < 0) |
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return 0; |
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if (args->len > NFSSVC_MAXBLKSIZE_V2) |
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return 0; |
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remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len; |
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remaining -= xdr_stream_pos(xdr); |
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if (remaining < xdr_align_size(args->len)) |
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return 0; |
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args->first.iov_base = xdr->p; |
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args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_createargs *args = rqstp->rq_argp; |
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return svcxdr_decode_diropargs(xdr, &args->fh, |
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&args->name, &args->len) && |
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svcxdr_decode_sattr(rqstp, xdr, &args->attrs); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_renameargs *args = rqstp->rq_argp; |
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return svcxdr_decode_diropargs(xdr, &args->ffh, |
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&args->fname, &args->flen) && |
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svcxdr_decode_diropargs(xdr, &args->tfh, |
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&args->tname, &args->tlen); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_linkargs *args = rqstp->rq_argp; |
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return svcxdr_decode_fhandle(xdr, &args->ffh) && |
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svcxdr_decode_diropargs(xdr, &args->tfh, |
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&args->tname, &args->tlen); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_symlinkargs *args = rqstp->rq_argp; |
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struct kvec *head = rqstp->rq_arg.head; |
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if (!svcxdr_decode_diropargs(xdr, &args->ffh, &args->fname, &args->flen)) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->tlen) < 0) |
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return 0; |
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if (args->tlen == 0) |
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return 0; |
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args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); |
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args->first.iov_base = xdr_inline_decode(xdr, args->tlen); |
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if (!args->first.iov_base) |
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return 0; |
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return svcxdr_decode_sattr(rqstp, xdr, &args->attrs); |
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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 xdr_stream *xdr = &rqstp->rq_arg_stream; |
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struct nfsd_readdirargs *args = rqstp->rq_argp; |
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if (!svcxdr_decode_fhandle(xdr, &args->fh)) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->cookie) < 0) |
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return 0; |
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if (xdr_stream_decode_u32(xdr, &args->count) < 0) |
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return 0; |
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return 1; |
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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_statres(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_res_stream; |
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struct nfsd_stat *resp = rqstp->rq_resp; |
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return svcxdr_encode_stat(xdr, resp->status); |
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} |
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int |
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nfssvc_encode_attrstatres(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_res_stream; |
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struct nfsd_attrstat *resp = rqstp->rq_resp; |
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if (!svcxdr_encode_stat(xdr, resp->status)) |
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return 0; |
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switch (resp->status) { |
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case nfs_ok: |
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if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) |
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return 0; |
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break; |
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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_diropres(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_res_stream; |
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struct nfsd_diropres *resp = rqstp->rq_resp; |
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if (!svcxdr_encode_stat(xdr, resp->status)) |
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return 0; |
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switch (resp->status) { |
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case nfs_ok: |
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if (!svcxdr_encode_fhandle(xdr, &resp->fh)) |
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return 0; |
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if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) |
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return 0; |
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break; |
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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_readlinkres(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_res_stream; |
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struct nfsd_readlinkres *resp = rqstp->rq_resp; |
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struct kvec *head = rqstp->rq_res.head; |
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if (!svcxdr_encode_stat(xdr, resp->status)) |
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return 0; |
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switch (resp->status) { |
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case nfs_ok: |
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if (xdr_stream_encode_u32(xdr, resp->len) < 0) |
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return 0; |
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xdr_write_pages(xdr, &resp->page, 0, resp->len); |
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if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0) |
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return 0; |
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break; |
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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 xdr_stream *xdr = &rqstp->rq_res_stream; |
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struct nfsd_readres *resp = rqstp->rq_resp; |
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struct kvec *head = rqstp->rq_res.head; |
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if (!svcxdr_encode_stat(xdr, resp->status)) |
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return 0; |
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switch (resp->status) { |
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case nfs_ok: |
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if (!svcxdr_encode_fattr(rqstp, xdr, &resp->fh, &resp->stat)) |
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return 0; |
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if (xdr_stream_encode_u32(xdr, resp->count) < 0) |
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return 0; |
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xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base, |
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resp->count); |
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if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0) |
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return 0; |
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break; |
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} |
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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_readdirres(struct svc_rqst *rqstp, __be32 *p) |
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{ |
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struct xdr_stream *xdr = &rqstp->rq_res_stream; |
|
struct nfsd_readdirres *resp = rqstp->rq_resp; |
|
struct xdr_buf *dirlist = &resp->dirlist; |
|
|
|
if (!svcxdr_encode_stat(xdr, resp->status)) |
|
return 0; |
|
switch (resp->status) { |
|
case nfs_ok: |
|
xdr_write_pages(xdr, dirlist->pages, 0, dirlist->len); |
|
/* no more entries */ |
|
if (xdr_stream_encode_item_absent(xdr) < 0) |
|
return 0; |
|
if (xdr_stream_encode_bool(xdr, resp->common.err == nfserr_eof) < 0) |
|
return 0; |
|
break; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
int |
|
nfssvc_encode_statfsres(struct svc_rqst *rqstp, __be32 *p) |
|
{ |
|
struct xdr_stream *xdr = &rqstp->rq_res_stream; |
|
struct nfsd_statfsres *resp = rqstp->rq_resp; |
|
struct kstatfs *stat = &resp->stats; |
|
|
|
if (!svcxdr_encode_stat(xdr, resp->status)) |
|
return 0; |
|
switch (resp->status) { |
|
case nfs_ok: |
|
p = xdr_reserve_space(xdr, XDR_UNIT * 5); |
|
if (!p) |
|
return 0; |
|
*p++ = cpu_to_be32(NFSSVC_MAXBLKSIZE_V2); |
|
*p++ = cpu_to_be32(stat->f_bsize); |
|
*p++ = cpu_to_be32(stat->f_blocks); |
|
*p++ = cpu_to_be32(stat->f_bfree); |
|
*p = cpu_to_be32(stat->f_bavail); |
|
break; |
|
} |
|
|
|
return 1; |
|
} |
|
|
|
/** |
|
* nfssvc_encode_nfscookie - Encode a directory offset cookie |
|
* @resp: readdir result context |
|
* @offset: offset cookie to encode |
|
* |
|
* The buffer space for the offset cookie has already been reserved |
|
* by svcxdr_encode_entry_common(). |
|
*/ |
|
void nfssvc_encode_nfscookie(struct nfsd_readdirres *resp, u32 offset) |
|
{ |
|
__be32 cookie = cpu_to_be32(offset); |
|
|
|
if (!resp->cookie_offset) |
|
return; |
|
|
|
write_bytes_to_xdr_buf(&resp->dirlist, resp->cookie_offset, &cookie, |
|
sizeof(cookie)); |
|
resp->cookie_offset = 0; |
|
} |
|
|
|
static bool |
|
svcxdr_encode_entry_common(struct nfsd_readdirres *resp, const char *name, |
|
int namlen, loff_t offset, u64 ino) |
|
{ |
|
struct xdr_buf *dirlist = &resp->dirlist; |
|
struct xdr_stream *xdr = &resp->xdr; |
|
|
|
if (xdr_stream_encode_item_present(xdr) < 0) |
|
return false; |
|
/* fileid */ |
|
if (xdr_stream_encode_u32(xdr, (u32)ino) < 0) |
|
return false; |
|
/* name */ |
|
if (xdr_stream_encode_opaque(xdr, name, min(namlen, NFS2_MAXNAMLEN)) < 0) |
|
return false; |
|
/* cookie */ |
|
resp->cookie_offset = dirlist->len; |
|
if (xdr_stream_encode_u32(xdr, ~0U) < 0) |
|
return false; |
|
|
|
return true; |
|
} |
|
|
|
/** |
|
* nfssvc_encode_entry - encode one NFSv2 READDIR entry |
|
* @data: directory context |
|
* @name: name of the object to be encoded |
|
* @namlen: length of that name, in bytes |
|
* @offset: the offset of the previous entry |
|
* @ino: the fileid of this entry |
|
* @d_type: unused |
|
* |
|
* Return values: |
|
* %0: Entry was successfully encoded. |
|
* %-EINVAL: An encoding problem occured, secondary status code in resp->common.err |
|
* |
|
* On exit, the following fields are updated: |
|
* - resp->xdr |
|
* - resp->common.err |
|
* - resp->cookie_offset |
|
*/ |
|
int nfssvc_encode_entry(void *data, const char *name, int namlen, |
|
loff_t offset, u64 ino, unsigned int d_type) |
|
{ |
|
struct readdir_cd *ccd = data; |
|
struct nfsd_readdirres *resp = container_of(ccd, |
|
struct nfsd_readdirres, |
|
common); |
|
unsigned int starting_length = resp->dirlist.len; |
|
|
|
/* The offset cookie for the previous entry */ |
|
nfssvc_encode_nfscookie(resp, offset); |
|
|
|
if (!svcxdr_encode_entry_common(resp, name, namlen, offset, ino)) |
|
goto out_toosmall; |
|
|
|
xdr_commit_encode(&resp->xdr); |
|
resp->common.err = nfs_ok; |
|
return 0; |
|
|
|
out_toosmall: |
|
resp->cookie_offset = 0; |
|
resp->common.err = nfserr_toosmall; |
|
resp->dirlist.len = starting_length; |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* XDR release functions |
|
*/ |
|
void nfssvc_release_attrstat(struct svc_rqst *rqstp) |
|
{ |
|
struct nfsd_attrstat *resp = rqstp->rq_resp; |
|
|
|
fh_put(&resp->fh); |
|
} |
|
|
|
void nfssvc_release_diropres(struct svc_rqst *rqstp) |
|
{ |
|
struct nfsd_diropres *resp = rqstp->rq_resp; |
|
|
|
fh_put(&resp->fh); |
|
} |
|
|
|
void nfssvc_release_readres(struct svc_rqst *rqstp) |
|
{ |
|
struct nfsd_readres *resp = rqstp->rq_resp; |
|
|
|
fh_put(&resp->fh); |
|
}
|
|
|