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