// SPDX-License-Identifier: GPL-2.0 /* * XDR support for nfsd/protocol version 3. * * Copyright (C) 1995, 1996, 1997 Olaf Kirch * * 2003-08-09 Jamie Lokier: Use htonl() for nanoseconds, not htons()! */ #include #include #include "xdr3.h" #include "auth.h" #include "netns.h" #include "vfs.h" #define NFSDDBG_FACILITY NFSDDBG_XDR /* * Force construction of an empty post-op attr */ static const struct svc_fh nfs3svc_null_fh = { .fh_no_wcc = true, }; /* * Mapping of S_IF* types to NFS file types */ static const u32 nfs3_ftypes[] = { NF3NON, NF3FIFO, NF3CHR, NF3BAD, NF3DIR, NF3BAD, NF3BLK, NF3BAD, NF3REG, NF3BAD, NF3LNK, NF3BAD, NF3SOCK, NF3BAD, NF3LNK, NF3BAD, }; /* * Basic NFSv3 data types (RFC 1813 Sections 2.5 and 2.6) */ static __be32 * encode_time3(__be32 *p, struct timespec64 *time) { *p++ = htonl((u32) time->tv_sec); *p++ = htonl(time->tv_nsec); return p; } static __be32 * encode_nfstime3(__be32 *p, const struct timespec64 *time) { *p++ = cpu_to_be32((u32)time->tv_sec); *p++ = cpu_to_be32(time->tv_nsec); return p; } static bool svcxdr_decode_nfstime3(struct xdr_stream *xdr, struct timespec64 *timep) { __be32 *p; p = xdr_inline_decode(xdr, XDR_UNIT * 2); if (!p) return false; timep->tv_sec = be32_to_cpup(p++); timep->tv_nsec = be32_to_cpup(p); return true; } /** * svcxdr_decode_nfs_fh3 - Decode an NFSv3 file handle * @xdr: XDR stream positioned at an undecoded NFSv3 FH * @fhp: OUT: filled-in server file handle * * Return values: * %false: The encoded file handle was not valid * %true: @fhp has been initialized */ bool svcxdr_decode_nfs_fh3(struct xdr_stream *xdr, struct svc_fh *fhp) { __be32 *p; u32 size; if (xdr_stream_decode_u32(xdr, &size) < 0) return false; if (size == 0 || size > NFS3_FHSIZE) return false; p = xdr_inline_decode(xdr, size); if (!p) return false; fh_init(fhp, NFS3_FHSIZE); fhp->fh_handle.fh_size = size; memcpy(&fhp->fh_handle.fh_base, p, size); return true; } static bool svcxdr_encode_nfsstat3(struct xdr_stream *xdr, __be32 status) { __be32 *p; p = xdr_reserve_space(xdr, sizeof(status)); if (!p) return false; *p = status; return true; } static bool svcxdr_encode_nfs_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp) { u32 size = fhp->fh_handle.fh_size; __be32 *p; p = xdr_reserve_space(xdr, XDR_UNIT + size); if (!p) return false; *p++ = cpu_to_be32(size); if (size) p[XDR_QUADLEN(size) - 1] = 0; memcpy(p, &fhp->fh_handle.fh_base, size); return true; } static bool svcxdr_encode_post_op_fh3(struct xdr_stream *xdr, const struct svc_fh *fhp) { if (xdr_stream_encode_item_present(xdr) < 0) return false; if (!svcxdr_encode_nfs_fh3(xdr, fhp)) return false; return true; } static __be32 * encode_fh(__be32 *p, struct svc_fh *fhp) { unsigned int size = fhp->fh_handle.fh_size; *p++ = htonl(size); if (size) p[XDR_QUADLEN(size)-1]=0; memcpy(p, &fhp->fh_handle.fh_base, size); return p + XDR_QUADLEN(size); } static bool svcxdr_encode_writeverf3(struct xdr_stream *xdr, const __be32 *verf) { __be32 *p; p = xdr_reserve_space(xdr, NFS3_WRITEVERFSIZE); if (!p) return false; memcpy(p, verf, NFS3_WRITEVERFSIZE); return true; } static bool svcxdr_decode_filename3(struct xdr_stream *xdr, char **name, unsigned int *len) { u32 size, i; __be32 *p; char *c; if (xdr_stream_decode_u32(xdr, &size) < 0) return false; if (size == 0 || size > NFS3_MAXNAMLEN) return false; p = xdr_inline_decode(xdr, size); if (!p) return false; *len = size; *name = (char *)p; for (i = 0, c = *name; i < size; i++, c++) { if (*c == '\0' || *c == '/') return false; } return true; } static bool svcxdr_decode_diropargs3(struct xdr_stream *xdr, struct svc_fh *fhp, char **name, unsigned int *len) { return svcxdr_decode_nfs_fh3(xdr, fhp) && svcxdr_decode_filename3(xdr, name, len); } static bool svcxdr_decode_sattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct iattr *iap) { u32 set_it; iap->ia_valid = 0; if (xdr_stream_decode_bool(xdr, &set_it) < 0) return false; if (set_it) { u32 mode; if (xdr_stream_decode_u32(xdr, &mode) < 0) return false; iap->ia_valid |= ATTR_MODE; iap->ia_mode = mode; } if (xdr_stream_decode_bool(xdr, &set_it) < 0) return false; if (set_it) { u32 uid; if (xdr_stream_decode_u32(xdr, &uid) < 0) return false; iap->ia_uid = make_kuid(nfsd_user_namespace(rqstp), uid); if (uid_valid(iap->ia_uid)) iap->ia_valid |= ATTR_UID; } if (xdr_stream_decode_bool(xdr, &set_it) < 0) return false; if (set_it) { u32 gid; if (xdr_stream_decode_u32(xdr, &gid) < 0) return false; iap->ia_gid = make_kgid(nfsd_user_namespace(rqstp), gid); if (gid_valid(iap->ia_gid)) iap->ia_valid |= ATTR_GID; } if (xdr_stream_decode_bool(xdr, &set_it) < 0) return false; if (set_it) { u64 newsize; if (xdr_stream_decode_u64(xdr, &newsize) < 0) return false; iap->ia_valid |= ATTR_SIZE; iap->ia_size = min_t(u64, newsize, NFS_OFFSET_MAX); } if (xdr_stream_decode_u32(xdr, &set_it) < 0) return false; switch (set_it) { case DONT_CHANGE: break; case SET_TO_SERVER_TIME: iap->ia_valid |= ATTR_ATIME; break; case SET_TO_CLIENT_TIME: if (!svcxdr_decode_nfstime3(xdr, &iap->ia_atime)) return false; iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; break; default: return false; } if (xdr_stream_decode_u32(xdr, &set_it) < 0) return false; switch (set_it) { case DONT_CHANGE: break; case SET_TO_SERVER_TIME: iap->ia_valid |= ATTR_MTIME; break; case SET_TO_CLIENT_TIME: if (!svcxdr_decode_nfstime3(xdr, &iap->ia_mtime)) return false; iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; break; default: return false; } return true; } static bool svcxdr_decode_sattrguard3(struct xdr_stream *xdr, struct nfsd3_sattrargs *args) { __be32 *p; u32 check; if (xdr_stream_decode_bool(xdr, &check) < 0) return false; if (check) { p = xdr_inline_decode(xdr, XDR_UNIT * 2); if (!p) return false; args->check_guard = 1; args->guardtime = be32_to_cpup(p); } else args->check_guard = 0; return true; } static bool svcxdr_decode_specdata3(struct xdr_stream *xdr, struct nfsd3_mknodargs *args) { __be32 *p; p = xdr_inline_decode(xdr, XDR_UNIT * 2); if (!p) return false; args->major = be32_to_cpup(p++); args->minor = be32_to_cpup(p); return true; } static bool svcxdr_decode_devicedata3(struct svc_rqst *rqstp, struct xdr_stream *xdr, struct nfsd3_mknodargs *args) { return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) && svcxdr_decode_specdata3(xdr, args); } static bool svcxdr_encode_fattr3(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct svc_fh *fhp, const struct kstat *stat) { struct user_namespace *userns = nfsd_user_namespace(rqstp); __be32 *p; u64 fsid; p = xdr_reserve_space(xdr, XDR_UNIT * 21); if (!p) return false; *p++ = cpu_to_be32(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]); *p++ = cpu_to_be32((u32)(stat->mode & S_IALLUGO)); *p++ = cpu_to_be32((u32)stat->nlink); *p++ = cpu_to_be32((u32)from_kuid_munged(userns, stat->uid)); *p++ = cpu_to_be32((u32)from_kgid_munged(userns, stat->gid)); if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) p = xdr_encode_hyper(p, (u64)NFS3_MAXPATHLEN); else p = xdr_encode_hyper(p, (u64)stat->size); /* used */ p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); /* rdev */ *p++ = cpu_to_be32((u32)MAJOR(stat->rdev)); *p++ = cpu_to_be32((u32)MINOR(stat->rdev)); switch(fsid_source(fhp)) { case FSIDSOURCE_FSID: fsid = (u64)fhp->fh_export->ex_fsid; break; case FSIDSOURCE_UUID: fsid = ((u64 *)fhp->fh_export->ex_uuid)[0]; fsid ^= ((u64 *)fhp->fh_export->ex_uuid)[1]; break; default: fsid = (u64)huge_encode_dev(fhp->fh_dentry->d_sb->s_dev); } p = xdr_encode_hyper(p, fsid); /* fileid */ p = xdr_encode_hyper(p, stat->ino); p = encode_nfstime3(p, &stat->atime); p = encode_nfstime3(p, &stat->mtime); encode_nfstime3(p, &stat->ctime); return true; } static __be32 *encode_fsid(__be32 *p, struct svc_fh *fhp) { u64 f; switch(fsid_source(fhp)) { default: case FSIDSOURCE_DEV: p = xdr_encode_hyper(p, (u64)huge_encode_dev (fhp->fh_dentry->d_sb->s_dev)); break; case FSIDSOURCE_FSID: p = xdr_encode_hyper(p, (u64) fhp->fh_export->ex_fsid); break; case FSIDSOURCE_UUID: f = ((u64*)fhp->fh_export->ex_uuid)[0]; f ^= ((u64*)fhp->fh_export->ex_uuid)[1]; p = xdr_encode_hyper(p, f); break; } return p; } static __be32 * encode_fattr3(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp, struct kstat *stat) { struct user_namespace *userns = nfsd_user_namespace(rqstp); *p++ = htonl(nfs3_ftypes[(stat->mode & S_IFMT) >> 12]); *p++ = htonl((u32) (stat->mode & S_IALLUGO)); *p++ = htonl((u32) stat->nlink); *p++ = htonl((u32) from_kuid_munged(userns, stat->uid)); *p++ = htonl((u32) from_kgid_munged(userns, stat->gid)); if (S_ISLNK(stat->mode) && stat->size > NFS3_MAXPATHLEN) { p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); } else { p = xdr_encode_hyper(p, (u64) stat->size); } p = xdr_encode_hyper(p, ((u64)stat->blocks) << 9); *p++ = htonl((u32) MAJOR(stat->rdev)); *p++ = htonl((u32) MINOR(stat->rdev)); p = encode_fsid(p, fhp); p = xdr_encode_hyper(p, stat->ino); p = encode_time3(p, &stat->atime); p = encode_time3(p, &stat->mtime); p = encode_time3(p, &stat->ctime); return p; } static __be32 * encode_saved_post_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) { /* Attributes to follow */ *p++ = xdr_one; return encode_fattr3(rqstp, p, fhp, &fhp->fh_post_attr); } static bool svcxdr_encode_wcc_attr(struct xdr_stream *xdr, const struct svc_fh *fhp) { __be32 *p; p = xdr_reserve_space(xdr, XDR_UNIT * 6); if (!p) return false; p = xdr_encode_hyper(p, (u64)fhp->fh_pre_size); p = encode_nfstime3(p, &fhp->fh_pre_mtime); encode_nfstime3(p, &fhp->fh_pre_ctime); return true; } static bool svcxdr_encode_pre_op_attr(struct xdr_stream *xdr, const struct svc_fh *fhp) { if (!fhp->fh_pre_saved) { if (xdr_stream_encode_item_absent(xdr) < 0) return false; return true; } if (xdr_stream_encode_item_present(xdr) < 0) return false; return svcxdr_encode_wcc_attr(xdr, fhp); } static bool svcxdr_encode_post_op_attr(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; struct kstat stat; /* * The inode may be NULL if the call failed because of a * stale file handle. In this case, no attributes are * returned. */ if (fhp->fh_no_wcc || !dentry || !d_really_is_positive(dentry)) goto no_post_op_attrs; if (fh_getattr(fhp, &stat) != nfs_ok) goto no_post_op_attrs; if (xdr_stream_encode_item_present(xdr) < 0) return false; lease_get_mtime(d_inode(dentry), &stat.mtime); if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &stat)) return false; return true; no_post_op_attrs: return xdr_stream_encode_item_absent(xdr) > 0; } /* * Encode post-operation attributes. * The inode may be NULL if the call failed because of a stale file * handle. In this case, no attributes are returned. */ static __be32 * encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; if (!fhp->fh_no_wcc && dentry && d_really_is_positive(dentry)) { __be32 err; struct kstat stat; err = fh_getattr(fhp, &stat); if (!err) { *p++ = xdr_one; /* attributes follow */ lease_get_mtime(d_inode(dentry), &stat.mtime); return encode_fattr3(rqstp, p, fhp, &stat); } } *p++ = xdr_zero; return p; } /* Helper for NFSv3 ACLs */ __be32 * nfs3svc_encode_post_op_attr(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) { return encode_post_op_attr(rqstp, p, fhp); } /* * Encode weak cache consistency data */ static bool svcxdr_encode_wcc_data(struct svc_rqst *rqstp, struct xdr_stream *xdr, const struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; if (!dentry || !d_really_is_positive(dentry) || !fhp->fh_post_saved) goto neither; /* before */ if (!svcxdr_encode_pre_op_attr(xdr, fhp)) return false; /* after */ if (xdr_stream_encode_item_present(xdr) < 0) return false; if (!svcxdr_encode_fattr3(rqstp, xdr, fhp, &fhp->fh_post_attr)) return false; return true; neither: if (xdr_stream_encode_item_absent(xdr) < 0) return false; if (!svcxdr_encode_post_op_attr(rqstp, xdr, fhp)) return false; return true; } /* * Enocde weak cache consistency data */ static __be32 * encode_wcc_data(struct svc_rqst *rqstp, __be32 *p, struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; if (dentry && d_really_is_positive(dentry) && fhp->fh_post_saved) { if (fhp->fh_pre_saved) { *p++ = xdr_one; p = xdr_encode_hyper(p, (u64) fhp->fh_pre_size); p = encode_time3(p, &fhp->fh_pre_mtime); p = encode_time3(p, &fhp->fh_pre_ctime); } else { *p++ = xdr_zero; } return encode_saved_post_attr(rqstp, p, fhp); } /* no pre- or post-attrs */ *p++ = xdr_zero; return encode_post_op_attr(rqstp, p, fhp); } static bool fs_supports_change_attribute(struct super_block *sb) { return sb->s_flags & SB_I_VERSION || sb->s_export_op->fetch_iversion; } /* * Fill in the pre_op attr for the wcc data */ void fill_pre_wcc(struct svc_fh *fhp) { struct inode *inode; struct kstat stat; bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE); if (fhp->fh_no_wcc || fhp->fh_pre_saved) return; inode = d_inode(fhp->fh_dentry); if (fs_supports_change_attribute(inode->i_sb) || !v4) { __be32 err = fh_getattr(fhp, &stat); if (err) { /* Grab the times from inode anyway */ stat.mtime = inode->i_mtime; stat.ctime = inode->i_ctime; stat.size = inode->i_size; } fhp->fh_pre_mtime = stat.mtime; fhp->fh_pre_ctime = stat.ctime; fhp->fh_pre_size = stat.size; } if (v4) fhp->fh_pre_change = nfsd4_change_attribute(&stat, inode); fhp->fh_pre_saved = true; } /* * Fill in the post_op attr for the wcc data */ void fill_post_wcc(struct svc_fh *fhp) { bool v4 = (fhp->fh_maxsize == NFS4_FHSIZE); struct inode *inode = d_inode(fhp->fh_dentry); if (fhp->fh_no_wcc) return; if (fhp->fh_post_saved) printk("nfsd: inode locked twice during operation.\n"); fhp->fh_post_saved = true; if (fs_supports_change_attribute(inode->i_sb) || !v4) { __be32 err = fh_getattr(fhp, &fhp->fh_post_attr); if (err) { fhp->fh_post_saved = false; fhp->fh_post_attr.ctime = inode->i_ctime; } } if (v4) fhp->fh_post_change = nfsd4_change_attribute(&fhp->fh_post_attr, inode); } /* * XDR decode functions */ int nfs3svc_decode_fhandleargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd_fhandle *args = rqstp->rq_argp; return svcxdr_decode_nfs_fh3(xdr, &args->fh); } int nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_sattrargs *args = rqstp->rq_argp; return svcxdr_decode_nfs_fh3(xdr, &args->fh) && svcxdr_decode_sattr3(rqstp, xdr, &args->attrs) && svcxdr_decode_sattrguard3(xdr, args); } int nfs3svc_decode_diropargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_diropargs *args = rqstp->rq_argp; return svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len); } int nfs3svc_decode_accessargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_accessargs *args = rqstp->rq_argp; if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) return 0; if (xdr_stream_decode_u32(xdr, &args->access) < 0) return 0; return 1; } int nfs3svc_decode_readargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_readargs *args = rqstp->rq_argp; if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) return 0; if (xdr_stream_decode_u64(xdr, &args->offset) < 0) return 0; if (xdr_stream_decode_u32(xdr, &args->count) < 0) return 0; return 1; } int nfs3svc_decode_writeargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_writeargs *args = rqstp->rq_argp; u32 max_blocksize = svc_max_payload(rqstp); struct kvec *head = rqstp->rq_arg.head; struct kvec *tail = rqstp->rq_arg.tail; size_t remaining; if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) return 0; if (xdr_stream_decode_u64(xdr, &args->offset) < 0) return 0; if (xdr_stream_decode_u32(xdr, &args->count) < 0) return 0; if (xdr_stream_decode_u32(xdr, &args->stable) < 0) return 0; /* opaque data */ if (xdr_stream_decode_u32(xdr, &args->len) < 0) return 0; /* request sanity */ if (args->count != args->len) return 0; remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len; remaining -= xdr_stream_pos(xdr); if (remaining < xdr_align_size(args->len)) return 0; if (args->count > max_blocksize) { args->count = max_blocksize; args->len = max_blocksize; } args->first.iov_base = xdr->p; args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); return 1; } int nfs3svc_decode_createargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_createargs *args = rqstp->rq_argp; if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len)) return 0; if (xdr_stream_decode_u32(xdr, &args->createmode) < 0) return 0; switch (args->createmode) { case NFS3_CREATE_UNCHECKED: case NFS3_CREATE_GUARDED: return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs); case NFS3_CREATE_EXCLUSIVE: args->verf = xdr_inline_decode(xdr, NFS3_CREATEVERFSIZE); if (!args->verf) return 0; break; default: return 0; } return 1; } int nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_createargs *args = rqstp->rq_argp; return svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len) && svcxdr_decode_sattr3(rqstp, xdr, &args->attrs); } int nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_symlinkargs *args = rqstp->rq_argp; struct kvec *head = rqstp->rq_arg.head; struct kvec *tail = rqstp->rq_arg.tail; size_t remaining; if (!svcxdr_decode_diropargs3(xdr, &args->ffh, &args->fname, &args->flen)) return 0; if (!svcxdr_decode_sattr3(rqstp, xdr, &args->attrs)) return 0; if (xdr_stream_decode_u32(xdr, &args->tlen) < 0) return 0; /* request sanity */ remaining = head->iov_len + rqstp->rq_arg.page_len + tail->iov_len; remaining -= xdr_stream_pos(xdr); if (remaining < xdr_align_size(args->tlen)) return 0; args->first.iov_base = xdr->p; args->first.iov_len = head->iov_len - xdr_stream_pos(xdr); return 1; } int nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_mknodargs *args = rqstp->rq_argp; if (!svcxdr_decode_diropargs3(xdr, &args->fh, &args->name, &args->len)) return 0; if (xdr_stream_decode_u32(xdr, &args->ftype) < 0) return 0; switch (args->ftype) { case NF3CHR: case NF3BLK: return svcxdr_decode_devicedata3(rqstp, xdr, args); case NF3SOCK: case NF3FIFO: return svcxdr_decode_sattr3(rqstp, xdr, &args->attrs); case NF3REG: case NF3DIR: case NF3LNK: /* Valid XDR but illegal file types */ break; default: return 0; } return 1; } int nfs3svc_decode_renameargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_renameargs *args = rqstp->rq_argp; return svcxdr_decode_diropargs3(xdr, &args->ffh, &args->fname, &args->flen) && svcxdr_decode_diropargs3(xdr, &args->tfh, &args->tname, &args->tlen); } int nfs3svc_decode_linkargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_linkargs *args = rqstp->rq_argp; return svcxdr_decode_nfs_fh3(xdr, &args->ffh) && svcxdr_decode_diropargs3(xdr, &args->tfh, &args->tname, &args->tlen); } int nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_readdirargs *args = rqstp->rq_argp; if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) return 0; if (xdr_stream_decode_u64(xdr, &args->cookie) < 0) return 0; args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE); if (!args->verf) return 0; if (xdr_stream_decode_u32(xdr, &args->count) < 0) return 0; return 1; } int nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_readdirargs *args = rqstp->rq_argp; u32 dircount; if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) return 0; if (xdr_stream_decode_u64(xdr, &args->cookie) < 0) return 0; args->verf = xdr_inline_decode(xdr, NFS3_COOKIEVERFSIZE); if (!args->verf) return 0; /* dircount is ignored */ if (xdr_stream_decode_u32(xdr, &dircount) < 0) return 0; if (xdr_stream_decode_u32(xdr, &args->count) < 0) return 0; return 1; } int nfs3svc_decode_commitargs(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_arg_stream; struct nfsd3_commitargs *args = rqstp->rq_argp; if (!svcxdr_decode_nfs_fh3(xdr, &args->fh)) return 0; if (xdr_stream_decode_u64(xdr, &args->offset) < 0) return 0; if (xdr_stream_decode_u32(xdr, &args->count) < 0) return 0; return 1; } /* * XDR encode functions */ /* GETATTR */ int nfs3svc_encode_getattrres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_attrstat *resp = rqstp->rq_resp; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: lease_get_mtime(d_inode(resp->fh.fh_dentry), &resp->stat.mtime); if (!svcxdr_encode_fattr3(rqstp, xdr, &resp->fh, &resp->stat)) return 0; break; } return 1; } /* SETATTR, REMOVE, RMDIR */ int nfs3svc_encode_wccstat(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_attrstat *resp = rqstp->rq_resp; return svcxdr_encode_nfsstat3(xdr, resp->status) && svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh); } /* LOOKUP */ int nfs3svc_encode_lookupres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_diropres *resp = rqstp->rq_resp; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_nfs_fh3(xdr, &resp->fh)) return 0; if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh)) return 0; break; default: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->dirfh)) return 0; } return 1; } /* ACCESS */ int nfs3svc_encode_accessres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_accessres *resp = rqstp->rq_resp; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; if (xdr_stream_encode_u32(xdr, resp->access) < 0) return 0; break; default: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; } return 1; } /* READLINK */ int nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_readlinkres *resp = rqstp->rq_resp; struct kvec *head = rqstp->rq_res.head; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; if (xdr_stream_encode_u32(xdr, resp->len) < 0) return 0; xdr_write_pages(xdr, resp->pages, 0, resp->len); if (svc_encode_result_payload(rqstp, head->iov_len, resp->len) < 0) return 0; break; default: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; } return 1; } /* READ */ int nfs3svc_encode_readres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_readres *resp = rqstp->rq_resp; struct kvec *head = rqstp->rq_res.head; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; if (xdr_stream_encode_u32(xdr, resp->count) < 0) return 0; if (xdr_stream_encode_bool(xdr, resp->eof) < 0) return 0; if (xdr_stream_encode_u32(xdr, resp->count) < 0) return 0; xdr_write_pages(xdr, resp->pages, rqstp->rq_res.page_base, resp->count); if (svc_encode_result_payload(rqstp, head->iov_len, resp->count) < 0) return 0; break; default: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; } return 1; } /* WRITE */ int nfs3svc_encode_writeres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_writeres *resp = rqstp->rq_resp; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh)) return 0; if (xdr_stream_encode_u32(xdr, resp->count) < 0) return 0; if (xdr_stream_encode_u32(xdr, resp->committed) < 0) return 0; if (!svcxdr_encode_writeverf3(xdr, resp->verf)) return 0; break; default: if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->fh)) return 0; } return 1; } /* CREATE, MKDIR, SYMLINK, MKNOD */ int nfs3svc_encode_createres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_diropres *resp = rqstp->rq_resp; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_post_op_fh3(xdr, &resp->fh)) return 0; if (!svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh)) return 0; if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh)) return 0; break; default: if (!svcxdr_encode_wcc_data(rqstp, xdr, &resp->dirfh)) return 0; } return 1; } /* RENAME */ int nfs3svc_encode_renameres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_renameres *resp = rqstp->rq_resp; return svcxdr_encode_nfsstat3(xdr, resp->status) && svcxdr_encode_wcc_data(rqstp, xdr, &resp->ffh) && svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh); } /* LINK */ int nfs3svc_encode_linkres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_linkres *resp = rqstp->rq_resp; return svcxdr_encode_nfsstat3(xdr, resp->status) && svcxdr_encode_post_op_attr(rqstp, xdr, &resp->fh) && svcxdr_encode_wcc_data(rqstp, xdr, &resp->tfh); } /* READDIR */ int nfs3svc_encode_readdirres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_readdirres *resp = rqstp->rq_resp; *p++ = resp->status; p = encode_post_op_attr(rqstp, p, &resp->fh); if (resp->status == 0) { /* stupid readdir cookie */ memcpy(p, resp->verf, 8); p += 2; xdr_ressize_check(rqstp, p); if (rqstp->rq_res.head[0].iov_len + (2<<2) > PAGE_SIZE) return 1; /*No room for trailer */ rqstp->rq_res.page_len = (resp->count) << 2; /* add the 'tail' to the end of the 'head' page - page 0. */ rqstp->rq_res.tail[0].iov_base = p; *p++ = 0; /* no more entries */ *p++ = htonl(resp->common.err == nfserr_eof); rqstp->rq_res.tail[0].iov_len = 2<<2; return 1; } else return xdr_ressize_check(rqstp, p); } static __be32 * encode_entry_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino) { *p++ = xdr_one; /* mark entry present */ p = xdr_encode_hyper(p, ino); /* file id */ p = xdr_encode_array(p, name, namlen);/* name length & name */ cd->offset = p; /* remember pointer */ p = xdr_encode_hyper(p, NFS_OFFSET_MAX);/* offset of next entry */ return p; } static __be32 compose_entry_fh(struct nfsd3_readdirres *cd, struct svc_fh *fhp, const char *name, int namlen, u64 ino) { struct svc_export *exp; struct dentry *dparent, *dchild; __be32 rv = nfserr_noent; dparent = cd->fh.fh_dentry; exp = cd->fh.fh_export; if (isdotent(name, namlen)) { if (namlen == 2) { dchild = dget_parent(dparent); /* * Don't return filehandle for ".." if we're at * the filesystem or export root: */ if (dchild == dparent) goto out; if (dparent == exp->ex_path.dentry) goto out; } else dchild = dget(dparent); } else dchild = lookup_positive_unlocked(name, dparent, namlen); if (IS_ERR(dchild)) return rv; if (d_mountpoint(dchild)) goto out; if (dchild->d_inode->i_ino != ino) goto out; rv = fh_compose(fhp, exp, dchild, &cd->fh); out: dput(dchild); return rv; } static __be32 *encode_entryplus_baggage(struct nfsd3_readdirres *cd, __be32 *p, const char *name, int namlen, u64 ino) { struct svc_fh *fh = &cd->scratch; __be32 err; fh_init(fh, NFS3_FHSIZE); err = compose_entry_fh(cd, fh, name, namlen, ino); if (err) { *p++ = 0; *p++ = 0; goto out; } p = encode_post_op_attr(cd->rqstp, p, fh); *p++ = xdr_one; /* yes, a file handle follows */ p = encode_fh(p, fh); out: fh_put(fh); return p; } /* * Encode a directory entry. This one works for both normal readdir * and readdirplus. * The normal readdir reply requires 2 (fileid) + 1 (stringlen) * + string + 2 (cookie) + 1 (next) words, i.e. 6 + strlen. * * The readdirplus baggage is 1+21 words for post_op_attr, plus the * file handle. */ #define NFS3_ENTRY_BAGGAGE (2 + 1 + 2 + 1) #define NFS3_ENTRYPLUS_BAGGAGE (1 + 21 + 1 + (NFS3_FHSIZE >> 2)) static int encode_entry(struct readdir_cd *ccd, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type, int plus) { struct nfsd3_readdirres *cd = container_of(ccd, struct nfsd3_readdirres, common); __be32 *p = cd->buffer; caddr_t curr_page_addr = NULL; struct page ** page; int slen; /* string (name) length */ int elen; /* estimated entry length in words */ int num_entry_words = 0; /* actual number of words */ if (cd->offset) { u64 offset64 = offset; if (unlikely(cd->offset1)) { /* we ended up with offset on a page boundary */ *cd->offset = htonl(offset64 >> 32); *cd->offset1 = htonl(offset64 & 0xffffffff); cd->offset1 = NULL; } else { xdr_encode_hyper(cd->offset, offset64); } cd->offset = NULL; } /* dprintk("encode_entry(%.*s @%ld%s)\n", namlen, name, (long) offset, plus? " plus" : ""); */ /* truncate filename if too long */ namlen = min(namlen, NFS3_MAXNAMLEN); slen = XDR_QUADLEN(namlen); elen = slen + NFS3_ENTRY_BAGGAGE + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); if (cd->buflen < elen) { cd->common.err = nfserr_toosmall; return -EINVAL; } /* determine which page in rq_respages[] we are currently filling */ for (page = cd->rqstp->rq_respages + 1; page < cd->rqstp->rq_next_page; page++) { curr_page_addr = page_address(*page); if (((caddr_t)cd->buffer >= curr_page_addr) && ((caddr_t)cd->buffer < curr_page_addr + PAGE_SIZE)) break; } if ((caddr_t)(cd->buffer + elen) < (curr_page_addr + PAGE_SIZE)) { /* encode entry in current page */ p = encode_entry_baggage(cd, p, name, namlen, ino); if (plus) p = encode_entryplus_baggage(cd, p, name, namlen, ino); num_entry_words = p - cd->buffer; } else if (*(page+1) != NULL) { /* temporarily encode entry into next page, then move back to * current and next page in rq_respages[] */ __be32 *p1, *tmp; int len1, len2; /* grab next page for temporary storage of entry */ p1 = tmp = page_address(*(page+1)); p1 = encode_entry_baggage(cd, p1, name, namlen, ino); if (plus) p1 = encode_entryplus_baggage(cd, p1, name, namlen, ino); /* determine entry word length and lengths to go in pages */ num_entry_words = p1 - tmp; len1 = curr_page_addr + PAGE_SIZE - (caddr_t)cd->buffer; if ((num_entry_words << 2) < len1) { /* the actual number of words in the entry is less * than elen and can still fit in the current page */ memmove(p, tmp, num_entry_words << 2); p += num_entry_words; /* update offset */ cd->offset = cd->buffer + (cd->offset - tmp); } else { unsigned int offset_r = (cd->offset - tmp) << 2; /* update pointer to offset location. * This is a 64bit quantity, so we need to * deal with 3 cases: * - entirely in first page * - entirely in second page * - 4 bytes in each page */ if (offset_r + 8 <= len1) { cd->offset = p + (cd->offset - tmp); } else if (offset_r >= len1) { cd->offset -= len1 >> 2; } else { /* sitting on the fence */ BUG_ON(offset_r != len1 - 4); cd->offset = p + (cd->offset - tmp); cd->offset1 = tmp; } len2 = (num_entry_words << 2) - len1; /* move from temp page to current and next pages */ memmove(p, tmp, len1); memmove(tmp, (caddr_t)tmp+len1, len2); p = tmp + (len2 >> 2); } } else { cd->common.err = nfserr_toosmall; return -EINVAL; } cd->buflen -= num_entry_words; cd->buffer = p; cd->common.err = nfs_ok; return 0; } int nfs3svc_encode_entry(void *cd, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) { return encode_entry(cd, name, namlen, offset, ino, d_type, 0); } int nfs3svc_encode_entry_plus(void *cd, const char *name, int namlen, loff_t offset, u64 ino, unsigned int d_type) { return encode_entry(cd, name, namlen, offset, ino, d_type, 1); } static bool svcxdr_encode_fsstat3resok(struct xdr_stream *xdr, const struct nfsd3_fsstatres *resp) { const struct kstatfs *s = &resp->stats; u64 bs = s->f_bsize; __be32 *p; p = xdr_reserve_space(xdr, XDR_UNIT * 13); if (!p) return false; p = xdr_encode_hyper(p, bs * s->f_blocks); /* total bytes */ p = xdr_encode_hyper(p, bs * s->f_bfree); /* free bytes */ p = xdr_encode_hyper(p, bs * s->f_bavail); /* user available bytes */ p = xdr_encode_hyper(p, s->f_files); /* total inodes */ p = xdr_encode_hyper(p, s->f_ffree); /* free inodes */ p = xdr_encode_hyper(p, s->f_ffree); /* user available inodes */ *p = cpu_to_be32(resp->invarsec); /* mean unchanged time */ return true; } /* FSSTAT */ int nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, __be32 *p) { struct xdr_stream *xdr = &rqstp->rq_res_stream; struct nfsd3_fsstatres *resp = rqstp->rq_resp; if (!svcxdr_encode_nfsstat3(xdr, resp->status)) return 0; switch (resp->status) { case nfs_ok: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh)) return 0; if (!svcxdr_encode_fsstat3resok(xdr, resp)) return 0; break; default: if (!svcxdr_encode_post_op_attr(rqstp, xdr, &nfs3svc_null_fh)) return 0; } return 1; } /* FSINFO */ int nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_fsinfores *resp = rqstp->rq_resp; *p++ = resp->status; *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { *p++ = htonl(resp->f_rtmax); *p++ = htonl(resp->f_rtpref); *p++ = htonl(resp->f_rtmult); *p++ = htonl(resp->f_wtmax); *p++ = htonl(resp->f_wtpref); *p++ = htonl(resp->f_wtmult); *p++ = htonl(resp->f_dtpref); p = xdr_encode_hyper(p, resp->f_maxfilesize); *p++ = xdr_one; *p++ = xdr_zero; *p++ = htonl(resp->f_properties); } return xdr_ressize_check(rqstp, p); } /* PATHCONF */ int nfs3svc_encode_pathconfres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_pathconfres *resp = rqstp->rq_resp; *p++ = resp->status; *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { *p++ = htonl(resp->p_link_max); *p++ = htonl(resp->p_name_max); *p++ = htonl(resp->p_no_trunc); *p++ = htonl(resp->p_chown_restricted); *p++ = htonl(resp->p_case_insensitive); *p++ = htonl(resp->p_case_preserving); } return xdr_ressize_check(rqstp, p); } /* COMMIT */ int nfs3svc_encode_commitres(struct svc_rqst *rqstp, __be32 *p) { struct nfsd3_commitres *resp = rqstp->rq_resp; *p++ = resp->status; p = encode_wcc_data(rqstp, p, &resp->fh); /* Write verifier */ if (resp->status == 0) { *p++ = resp->verf[0]; *p++ = resp->verf[1]; } return xdr_ressize_check(rqstp, p); } /* * XDR release functions */ void nfs3svc_release_fhandle(struct svc_rqst *rqstp) { struct nfsd3_attrstat *resp = rqstp->rq_resp; fh_put(&resp->fh); } void nfs3svc_release_fhandle2(struct svc_rqst *rqstp) { struct nfsd3_fhandle_pair *resp = rqstp->rq_resp; fh_put(&resp->fh1); fh_put(&resp->fh2); }