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/* * XDR functions for basic NFS types */ static inline u32 * encode_time3(u32 *p, time_t secs) { *p++ = htonl((u32) secs); *p++ = 0; return p; } static inline u32 * decode_time3(u32 *p, time_t *secp) { *secp = ntohl(*p++); return p + 1; } static inline u32 * decode_fh(u32 *p, struct svc_fh *fhp) { int size; fh_init(fhp, NFS3_FHSIZE); size = ntohl(*p++); if (size > NFS3_FHSIZE) return NULL; memcpy(&fhp->fh_handle.fh_base, p, size); fhp->fh_handle.fh_size = size; return p + XDR_QUADLEN(size); } static inline u32 * encode_fh(u32 *p, struct svc_fh *fhp) { 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); } /* * Decode a file name and make sure that the path contains * no slashes or null bytes. */ static inline u32 * decode_filename(u32 *p, char **namp, int *lenp) { char *name; int i; if ((p = xdr_decode_string(p, namp, lenp, NFS3_MAXNAMLEN)) != NULL) { for (i = 0, name = *namp; i < *lenp; i++, name++) { if (*name == '\0' || *name == '/') return NULL; } *name = '\0'; } return p; } static inline u32 * decode_pathname(u32 *p, char **namp, int *lenp) { char *name; int i; if ((p = xdr_decode_string(p, namp, lenp, NFS3_MAXPATHLEN)) != NULL) { for (i = 0, name = *namp; i < *lenp; i++, name++) { if (*name == '\0') return NULL; } *name = '\0'; } return p; } static inline u32 * decode_sattr3(u32 *p, struct iattr *iap) { u32 tmp; iap->ia_valid = 0; if (*p++) { iap->ia_valid |= ATTR_MODE; iap->ia_mode = ntohl(*p++); } if (*p++) { iap->ia_valid |= ATTR_UID; iap->ia_uid = ntohl(*p++); } if (*p++) { iap->ia_valid |= ATTR_GID; iap->ia_gid = ntohl(*p++); } if (*p++) { u64 newsize; iap->ia_valid |= ATTR_SIZE; p = xdr_decode_hyper(p, &newsize); if (newsize <= NFS_OFFSET_MAX) iap->ia_size = newsize; else iap->ia_size = NFS_OFFSET_MAX; } if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ iap->ia_valid |= ATTR_ATIME; } else if (tmp == 2) { /* set to client time */ iap->ia_valid |= ATTR_ATIME | ATTR_ATIME_SET; iap->ia_atime = ntohl(*p++), p++; } if ((tmp = ntohl(*p++)) == 1) { /* set to server time */ iap->ia_valid |= ATTR_MTIME; } else if (tmp == 2) { /* set to client time */ iap->ia_valid |= ATTR_MTIME | ATTR_MTIME_SET; iap->ia_mtime = ntohl(*p++), p++; } return p; } static inline u32 * encode_fattr3(struct svc_rqst *rqstp, u32 *p, struct dentry *dentry) { struct inode *inode = dentry->d_inode; if (!inode) { printk("nfsd: NULL inode in %s:%d", __FILE__, __LINE__); return NULL; } *p++ = htonl(nfs3_ftypes[(inode->i_mode & S_IFMT) >> 12]); *p++ = htonl((u32) inode->i_mode); *p++ = htonl((u32) inode->i_nlink); *p++ = htonl((u32) nfsd_ruid(rqstp, inode->i_uid)); *p++ = htonl((u32) nfsd_rgid(rqstp, inode->i_gid)); if (S_ISLNK(inode->i_mode) && inode->i_size > NFS3_MAXPATHLEN) { p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); } else { p = xdr_encode_hyper(p, (u64) inode->i_size); } if (inode->i_blksize == 0 && inode->i_blocks == 0) /* Minix file system(?) i_size is (hopefully) close enough */ p = xdr_encode_hyper(p, (u64)(inode->i_size +511)& ~511); else p = xdr_encode_hyper(p, ((u64)inode->i_blocks) << 9); *p++ = htonl((u32) MAJOR(inode->i_rdev)); *p++ = htonl((u32) MINOR(inode->i_rdev)); p = xdr_encode_hyper(p, (u64) inode->i_dev); p = xdr_encode_hyper(p, (u64) inode->i_ino); p = encode_time3(p, inode->i_atime); p = encode_time3(p, lease_get_mtime(inode)); p = encode_time3(p, inode->i_ctime); return p; } static inline u32 * encode_saved_post_attr(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { struct inode *inode = fhp->fh_dentry->d_inode; /* Attributes to follow */ *p++ = xdr_one; *p++ = htonl(nfs3_ftypes[(fhp->fh_post_mode & S_IFMT) >> 12]); *p++ = htonl((u32) fhp->fh_post_mode); *p++ = htonl((u32) fhp->fh_post_nlink); *p++ = htonl((u32) nfsd_ruid(rqstp, fhp->fh_post_uid)); *p++ = htonl((u32) nfsd_rgid(rqstp, fhp->fh_post_gid)); if (S_ISLNK(fhp->fh_post_mode) && fhp->fh_post_size > NFS3_MAXPATHLEN) { p = xdr_encode_hyper(p, (u64) NFS3_MAXPATHLEN); } else { p = xdr_encode_hyper(p, (u64) fhp->fh_post_size); } p = xdr_encode_hyper(p, ((u64)fhp->fh_post_blocks) << 9); *p++ = htonl((u32) MAJOR(fhp->fh_post_rdev)); *p++ = htonl((u32) MINOR(fhp->fh_post_rdev)); p = xdr_encode_hyper(p, (u64) inode->i_dev); p = xdr_encode_hyper(p, (u64) inode->i_ino); p = encode_time3(p, fhp->fh_post_atime); p = encode_time3(p, fhp->fh_post_mtime); p = encode_time3(p, fhp->fh_post_ctime); return p; } /* * 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 u32 * encode_post_op_attr(struct svc_rqst *rqstp, u32 *p, struct dentry *dentry) { if (dentry && dentry->d_inode != NULL) { *p++ = xdr_one; /* attributes follow */ return encode_fattr3(rqstp, p, dentry); } *p++ = xdr_zero; return p; } /* * Enocde weak cache consistency data */ static u32 * encode_wcc_data(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { struct dentry *dentry = fhp->fh_dentry; if (dentry && dentry->d_inode && 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, dentry); } /* * Check buffer bounds after decoding arguments */ static inline int xdr_argsize_check(struct svc_rqst *rqstp, u32 *p) { struct svc_buf *buf = &rqstp->rq_argbuf; return p - buf->base <= buf->buflen; } static inline int xdr_ressize_check(struct svc_rqst *rqstp, u32 *p) { struct svc_buf *buf = &rqstp->rq_resbuf; buf->len = p - buf->base; dprintk("nfsd: ressize_check p %p base %p len %d\n", p, buf->base, buf->buflen); return (buf->len <= buf->buflen); } /* * XDR decode functions */ int nfs3svc_decode_fhandle(struct svc_rqst *rqstp, u32 *p, struct svc_fh *fhp) { if (!(p = decode_fh(p, fhp))) return 0; return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_sattrargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_sattrargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_sattr3(p, &args->attrs))) return 0; if ((args->check_guard = ntohl(*p++)) != 0) p = decode_time3(p, &args->guardtime); return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_diropargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_diropargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len))) return 0; return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_accessargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_accessargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; args->access = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_readargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = xdr_decode_hyper(p, &args->offset))) return 0; args->count = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_writeargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_writeargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = xdr_decode_hyper(p, &args->offset))) return 0; args->count = ntohl(*p++); args->stable = ntohl(*p++); args->len = ntohl(*p++); args->data = (char *) p; p += XDR_QUADLEN(args->len); return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_createargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_createargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len))) return 0; switch (args->createmode = ntohl(*p++)) { case NFS3_CREATE_UNCHECKED: case NFS3_CREATE_GUARDED: if (!(p = decode_sattr3(p, &args->attrs))) return 0; break; case NFS3_CREATE_EXCLUSIVE: args->verf = p; p += 2; break; default: return 0; } return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_mkdirargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_createargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len)) || !(p = decode_sattr3(p, &args->attrs))) return 0; return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_symlinkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_symlinkargs *args) { if (!(p = decode_fh(p, &args->ffh)) || !(p = decode_filename(p, &args->fname, &args->flen)) || !(p = decode_sattr3(p, &args->attrs)) || !(p = decode_pathname(p, &args->tname, &args->tlen))) return 0; return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_mknodargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_mknodargs *args) { if (!(p = decode_fh(p, &args->fh)) || !(p = decode_filename(p, &args->name, &args->len))) return 0; args->ftype = ntohl(*p++); if (args->ftype == NF3BLK || args->ftype == NF3CHR || args->ftype == NF3SOCK || args->ftype == NF3FIFO) { if (!(p = decode_sattr3(p, &args->attrs))) return 0; } if (args->ftype == NF3BLK || args->ftype == NF3CHR) { args->major = ntohl(*p++); args->minor = ntohl(*p++); } return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_renameargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_renameargs *args) { if (!(p = decode_fh(p, &args->ffh)) || !(p = decode_filename(p, &args->fname, &args->flen)) || !(p = decode_fh(p, &args->tfh)) || !(p = decode_filename(p, &args->tname, &args->tlen))) return 0; return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_linkargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_linkargs *args) { if (!(p = decode_fh(p, &args->ffh)) || !(p = decode_fh(p, &args->tfh)) || !(p = decode_filename(p, &args->tname, &args->tlen))) return 0; return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_readdirargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readdirargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; p = xdr_decode_hyper(p, &args->cookie); args->verf = p; p += 2; args->dircount = ~0; args->count = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_readdirplusargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readdirargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; p = xdr_decode_hyper(p, &args->cookie); args->verf = p; p += 2; args->dircount = ntohl(*p++); args->count = ntohl(*p++); return xdr_argsize_check(rqstp, p); } int nfs3svc_decode_commitargs(struct svc_rqst *rqstp, u32 *p, struct nfsd3_commitargs *args) { if (!(p = decode_fh(p, &args->fh))) return 0; p = xdr_decode_hyper(p, &args->offset); args->count = ntohl(*p++); return xdr_argsize_check(rqstp, p); } /* * XDR encode functions */ /* * There must be an encoding function for void results so svc_process * will work properly. */ int nfs3svc_encode_voidres(struct svc_rqst *rqstp, u32 *p, void *dummy) { return xdr_ressize_check(rqstp, p); } /* GETATTR */ int nfs3svc_encode_attrstat(struct svc_rqst *rqstp, u32 *p, struct nfsd3_attrstat *resp) { if (resp->status == 0 && !(p = encode_fattr3(rqstp, p, resp->fh.fh_dentry))) return 0; return xdr_ressize_check(rqstp, p); } /* SETATTR, REMOVE, RMDIR */ int nfs3svc_encode_wccstat(struct svc_rqst *rqstp, u32 *p, struct nfsd3_attrstat *resp) { if (!(p = encode_wcc_data(rqstp, p, &resp->fh))) return 0; return xdr_ressize_check(rqstp, p); } /* LOOKUP */ int nfs3svc_encode_diropres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_diropres *resp) { if (resp->status == 0) { p = encode_fh(p, &resp->fh); p = encode_post_op_attr(rqstp, p, resp->fh.fh_dentry); } p = encode_post_op_attr(rqstp, p, resp->dirfh.fh_dentry); return xdr_ressize_check(rqstp, p); } /* ACCESS */ int nfs3svc_encode_accessres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_accessres *resp) { p = encode_post_op_attr(rqstp, p, resp->fh.fh_dentry); if (resp->status == 0) *p++ = htonl(resp->access); return xdr_ressize_check(rqstp, p); } /* READLINK */ int nfs3svc_encode_readlinkres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readlinkres *resp) { p = encode_post_op_attr(rqstp, p, resp->fh.fh_dentry); if (resp->status == 0) { *p++ = htonl(resp->len); p += XDR_QUADLEN(resp->len); } return xdr_ressize_check(rqstp, p); } /* READ */ int nfs3svc_encode_readres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readres *resp) { p = encode_post_op_attr(rqstp, p, resp->fh.fh_dentry); if (resp->status == 0) { *p++ = htonl(resp->count); *p++ = htonl(resp->eof); *p++ = htonl(resp->count); /* xdr opaque count */ p += XDR_QUADLEN(resp->count); } return xdr_ressize_check(rqstp, p); } /* WRITE */ int nfs3svc_encode_writeres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_writeres *resp) { p = encode_wcc_data(rqstp, p, &resp->fh); if (resp->status == 0) { *p++ = htonl(resp->count); *p++ = htonl(resp->committed); *p++ = htonl(nfssvc_boot.tv_sec); *p++ = htonl(nfssvc_boot.tv_usec); } return xdr_ressize_check(rqstp, p); } /* CREATE, MKDIR, SYMLINK, MKNOD */ int nfs3svc_encode_createres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_diropres *resp) { if (resp->status == 0) { *p++ = xdr_one; p = encode_fh(p, &resp->fh); p = encode_post_op_attr(rqstp, p, resp->fh.fh_dentry); } p = encode_wcc_data(rqstp, p, &resp->dirfh); return xdr_ressize_check(rqstp, p); } /* RENAME */ int nfs3svc_encode_renameres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_renameres *resp) { p = encode_wcc_data(rqstp, p, &resp->ffh); p = encode_wcc_data(rqstp, p, &resp->tfh); return xdr_ressize_check(rqstp, p); } /* LINK */ int nfs3svc_encode_linkres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_linkres *resp) { p = encode_post_op_attr(rqstp, p, resp->fh.fh_dentry); p = encode_wcc_data(rqstp, p, &resp->tfh); return xdr_ressize_check(rqstp, p); } /* READDIR */ int nfs3svc_encode_readdirres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_readdirres *resp) { p = encode_post_op_attr(rqstp, p, resp->fh.fh_dentry); if (resp->status == 0) { /* stupid readdir cookie */ memcpy(p, resp->verf, 8); p += 2; p += XDR_QUADLEN(resp->count); } return xdr_ressize_check(rqstp, 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 *cd, const char *name, int namlen, off_t offset, ino_t ino, unsigned int d_type, int plus) { u32 *p = cd->buffer; int buflen, slen, elen; if (cd->offset) xdr_encode_hyper(cd->offset, (u64) offset); /* nfsd_readdir calls us with name == 0 when it wants us to * set the last offset entry. */ if (name == 0) return 0; /* dprintk("encode_entry(%.*s @%ld%s)\n", namlen, name, (long) offset, plus? " plus" : ""); */ /* truncate filename if too long */ if (namlen > NFS3_MAXNAMLEN) namlen = NFS3_MAXNAMLEN; slen = XDR_QUADLEN(namlen); elen = slen + NFS3_ENTRY_BAGGAGE + (plus? NFS3_ENTRYPLUS_BAGGAGE : 0); if ((buflen = cd->buflen - elen) < 0) { cd->eob = 1; return -EINVAL; } *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 */ /* throw in readdirplus baggage */ if (plus) { struct svc_fh fh; struct svc_export *exp; struct dentry *dparent, *dchild; dparent = cd->dirfh->fh_dentry; exp = cd->dirfh->fh_export; fh_init(&fh, NFS3_FHSIZE); if (isdotent(name, namlen)) { dchild = dparent; if (namlen == 2) dchild = dchild->d_parent; dchild = dget(dchild); } else dchild = lookup_one_len(name, dparent,namlen); if (IS_ERR(dchild)) goto noexec; if (fh_compose(&fh, exp, dchild, cd->dirfh) != 0 || !dchild->d_inode) goto noexec; p = encode_post_op_attr(cd->rqstp, p, fh.fh_dentry); *p++ = xdr_one; /* yes, a file handle follows */ p = encode_fh(p, &fh); fh_put(&fh); } out: cd->buflen = buflen; cd->buffer = p; return 0; noexec: *p++ = 0; *p++ = 0; goto out; } int nfs3svc_encode_entry(struct readdir_cd *cd, const char *name, int namlen, off_t offset, ino_t ino, unsigned int d_type) { return encode_entry(cd, name, namlen, offset, ino, d_type, 0); } int nfs3svc_encode_entry_plus(struct readdir_cd *cd, const char *name, int namlen, off_t offset, ino_t ino, unsigned int d_type) { return encode_entry(cd, name, namlen, offset, ino, d_type, 1); } /* FSSTAT */ int nfs3svc_encode_fsstatres(struct svc_rqst *rqstp, u32 *p, struct nfsd3_fsstatres *resp) { struct statfs *s = &resp->stats; u64 bs = s->f_bsize; *p++ = xdr_zero; /* no post_op_attr */ if (resp->status == 0) { 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++ = htonl(resp->invarsec); /* mean unchanged time */ } return xdr_ressize_check(rqstp, p); } /* FSINFO */ int nfs3svc_encode_fsinfores(struct svc_rqst *rqstp, u32 *p, struct nfsd3_fsinfores *resp) { *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, u32 *p, struct nfsd3_pathconfres *resp) { *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, u32 *p, struct nfsd3_commitres *resp) { p = encode_wcc_data(rqstp, p, &resp->fh); /* Write verifier */ if (resp->status == 0) { *p++ = htonl(nfssvc_boot.tv_sec); *p++ = htonl(nfssvc_boot.tv_usec); } return xdr_ressize_check(rqstp, p); } /* * XDR release functions */ int nfs3svc_release_fhandle(struct svc_rqst *rqstp, u32 *p, struct nfsd3_attrstat *resp) { fh_put(&resp->fh); return 1; } int nfs3svc_release_fhandle2(struct svc_rqst *rqstp, u32 *p, struct nfsd3_fhandle_pair *resp) { fh_put(&resp->fh1); fh_put(&resp->fh2); return 1; } |