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544 lines
13 KiB
544 lines
13 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* In-kernel MOUNT protocol client |
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* |
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* Copyright (C) 1997, Olaf Kirch <[email protected]> |
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*/ |
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#include <linux/types.h> |
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#include <linux/socket.h> |
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#include <linux/kernel.h> |
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#include <linux/errno.h> |
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#include <linux/uio.h> |
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#include <linux/net.h> |
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#include <linux/in.h> |
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#include <linux/sunrpc/clnt.h> |
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#include <linux/sunrpc/sched.h> |
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#include <linux/nfs_fs.h> |
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#include "internal.h" |
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#define NFSDBG_FACILITY NFSDBG_MOUNT |
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/* |
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* Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4 |
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*/ |
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#define MNTPATHLEN (1024) |
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|
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/* |
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* XDR data type sizes |
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*/ |
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#define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN)) |
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#define MNT_status_sz (1) |
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#define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE) |
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#define MNT_fhandlev3_sz XDR_QUADLEN(NFS3_FHSIZE) |
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#define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS) |
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/* |
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* XDR argument and result sizes |
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*/ |
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#define MNT_enc_dirpath_sz encode_dirpath_sz |
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#define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz) |
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#define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandlev3_sz + \ |
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MNT_authflav3_sz) |
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/* |
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* Defined by RFC 1094, section A.5 |
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*/ |
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enum { |
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MOUNTPROC_NULL = 0, |
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MOUNTPROC_MNT = 1, |
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MOUNTPROC_DUMP = 2, |
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MOUNTPROC_UMNT = 3, |
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MOUNTPROC_UMNTALL = 4, |
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MOUNTPROC_EXPORT = 5, |
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}; |
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/* |
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* Defined by RFC 1813, section 5.2 |
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*/ |
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enum { |
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MOUNTPROC3_NULL = 0, |
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MOUNTPROC3_MNT = 1, |
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MOUNTPROC3_DUMP = 2, |
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MOUNTPROC3_UMNT = 3, |
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MOUNTPROC3_UMNTALL = 4, |
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MOUNTPROC3_EXPORT = 5, |
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}; |
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static const struct rpc_program mnt_program; |
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/* |
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* Defined by OpenGroup XNFS Version 3W, chapter 8 |
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*/ |
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enum mountstat { |
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MNT_OK = 0, |
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MNT_EPERM = 1, |
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MNT_ENOENT = 2, |
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MNT_EACCES = 13, |
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MNT_EINVAL = 22, |
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}; |
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static struct { |
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u32 status; |
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int errno; |
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} mnt_errtbl[] = { |
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{ .status = MNT_OK, .errno = 0, }, |
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{ .status = MNT_EPERM, .errno = -EPERM, }, |
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{ .status = MNT_ENOENT, .errno = -ENOENT, }, |
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{ .status = MNT_EACCES, .errno = -EACCES, }, |
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{ .status = MNT_EINVAL, .errno = -EINVAL, }, |
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}; |
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/* |
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* Defined by RFC 1813, section 5.1.5 |
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*/ |
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enum mountstat3 { |
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MNT3_OK = 0, /* no error */ |
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MNT3ERR_PERM = 1, /* Not owner */ |
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MNT3ERR_NOENT = 2, /* No such file or directory */ |
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MNT3ERR_IO = 5, /* I/O error */ |
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MNT3ERR_ACCES = 13, /* Permission denied */ |
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MNT3ERR_NOTDIR = 20, /* Not a directory */ |
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MNT3ERR_INVAL = 22, /* Invalid argument */ |
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MNT3ERR_NAMETOOLONG = 63, /* Filename too long */ |
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MNT3ERR_NOTSUPP = 10004, /* Operation not supported */ |
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MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */ |
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}; |
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static struct { |
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u32 status; |
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int errno; |
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} mnt3_errtbl[] = { |
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{ .status = MNT3_OK, .errno = 0, }, |
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{ .status = MNT3ERR_PERM, .errno = -EPERM, }, |
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{ .status = MNT3ERR_NOENT, .errno = -ENOENT, }, |
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{ .status = MNT3ERR_IO, .errno = -EIO, }, |
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{ .status = MNT3ERR_ACCES, .errno = -EACCES, }, |
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{ .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, }, |
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{ .status = MNT3ERR_INVAL, .errno = -EINVAL, }, |
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{ .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, }, |
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{ .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, }, |
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{ .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, }, |
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}; |
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struct mountres { |
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int errno; |
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struct nfs_fh *fh; |
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unsigned int *auth_count; |
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rpc_authflavor_t *auth_flavors; |
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}; |
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struct mnt_fhstatus { |
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u32 status; |
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struct nfs_fh *fh; |
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}; |
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/** |
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* nfs_mount - Obtain an NFS file handle for the given host and path |
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* @info: pointer to mount request arguments |
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* @timeo: deciseconds the mount waits for a response before it retries |
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* @retrans: number of times the mount retries a request |
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* |
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* Uses timeout parameters specified by caller. On successful return, the |
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* auth_flavs list and auth_flav_len will be populated with the list from the |
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* server or a faked-up list if the server didn't provide one. |
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*/ |
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int nfs_mount(struct nfs_mount_request *info, int timeo, int retrans) |
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{ |
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struct rpc_timeout mnt_timeout; |
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struct mountres result = { |
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.fh = info->fh, |
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.auth_count = info->auth_flav_len, |
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.auth_flavors = info->auth_flavs, |
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}; |
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struct rpc_message msg = { |
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.rpc_argp = info->dirpath, |
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.rpc_resp = &result, |
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}; |
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struct rpc_create_args args = { |
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.net = info->net, |
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.protocol = info->protocol, |
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.address = info->sap, |
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.addrsize = info->salen, |
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.timeout = &mnt_timeout, |
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.servername = info->hostname, |
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.program = &mnt_program, |
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.version = info->version, |
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.authflavor = RPC_AUTH_UNIX, |
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.cred = current_cred(), |
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}; |
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struct rpc_clnt *mnt_clnt; |
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int status; |
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dprintk("NFS: sending MNT request for %s:%s\n", |
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(info->hostname ? info->hostname : "server"), |
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info->dirpath); |
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if (strlen(info->dirpath) > MNTPATHLEN) |
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return -ENAMETOOLONG; |
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if (info->noresvport) |
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args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
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nfs_init_timeout_values(&mnt_timeout, info->protocol, timeo, retrans); |
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mnt_clnt = rpc_create(&args); |
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if (IS_ERR(mnt_clnt)) |
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goto out_clnt_err; |
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if (info->version == NFS_MNT3_VERSION) |
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msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; |
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else |
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msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT]; |
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status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT); |
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rpc_shutdown_client(mnt_clnt); |
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if (status < 0) |
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goto out_call_err; |
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if (result.errno != 0) |
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goto out_mnt_err; |
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dprintk("NFS: MNT request succeeded\n"); |
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status = 0; |
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/* |
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* If the server didn't provide a flavor list, allow the |
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* client to try any flavor. |
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*/ |
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if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) { |
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dprintk("NFS: Faking up auth_flavs list\n"); |
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info->auth_flavs[0] = RPC_AUTH_NULL; |
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*info->auth_flav_len = 1; |
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} |
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out: |
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return status; |
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out_clnt_err: |
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status = PTR_ERR(mnt_clnt); |
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dprintk("NFS: failed to create MNT RPC client, status=%d\n", status); |
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goto out; |
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out_call_err: |
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dprintk("NFS: MNT request failed, status=%d\n", status); |
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goto out; |
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out_mnt_err: |
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dprintk("NFS: MNT server returned result %d\n", result.errno); |
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status = result.errno; |
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goto out; |
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} |
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/** |
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* nfs_umount - Notify a server that we have unmounted this export |
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* @info: pointer to umount request arguments |
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* |
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* MOUNTPROC_UMNT is advisory, so we set a short timeout, and always |
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* use UDP. |
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*/ |
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void nfs_umount(const struct nfs_mount_request *info) |
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{ |
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static const struct rpc_timeout nfs_umnt_timeout = { |
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.to_initval = 1 * HZ, |
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.to_maxval = 3 * HZ, |
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.to_retries = 2, |
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}; |
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struct rpc_create_args args = { |
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.net = info->net, |
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.protocol = IPPROTO_UDP, |
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.address = info->sap, |
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.addrsize = info->salen, |
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.timeout = &nfs_umnt_timeout, |
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.servername = info->hostname, |
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.program = &mnt_program, |
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.version = info->version, |
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.authflavor = RPC_AUTH_UNIX, |
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.flags = RPC_CLNT_CREATE_NOPING, |
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.cred = current_cred(), |
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}; |
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struct rpc_message msg = { |
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.rpc_argp = info->dirpath, |
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}; |
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struct rpc_clnt *clnt; |
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int status; |
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if (strlen(info->dirpath) > MNTPATHLEN) |
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return; |
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if (info->noresvport) |
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args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
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clnt = rpc_create(&args); |
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if (IS_ERR(clnt)) |
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goto out_clnt_err; |
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dprintk("NFS: sending UMNT request for %s:%s\n", |
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(info->hostname ? info->hostname : "server"), info->dirpath); |
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if (info->version == NFS_MNT3_VERSION) |
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msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT]; |
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else |
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msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT]; |
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status = rpc_call_sync(clnt, &msg, 0); |
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rpc_shutdown_client(clnt); |
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if (unlikely(status < 0)) |
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goto out_call_err; |
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return; |
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out_clnt_err: |
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dprintk("NFS: failed to create UMNT RPC client, status=%ld\n", |
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PTR_ERR(clnt)); |
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return; |
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out_call_err: |
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dprintk("NFS: UMNT request failed, status=%d\n", status); |
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} |
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/* |
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* XDR encode/decode functions for MOUNT |
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*/ |
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static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) |
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{ |
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const u32 pathname_len = strlen(pathname); |
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__be32 *p; |
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p = xdr_reserve_space(xdr, 4 + pathname_len); |
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xdr_encode_opaque(p, pathname, pathname_len); |
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} |
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static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr, |
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const void *dirpath) |
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{ |
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encode_mntdirpath(xdr, dirpath); |
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} |
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/* |
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* RFC 1094: "A non-zero status indicates some sort of error. In this |
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* case, the status is a UNIX error number." This can be problematic |
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* if the server and client use different errno values for the same |
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* error. |
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* |
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* However, the OpenGroup XNFS spec provides a simple mapping that is |
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* independent of local errno values on the server and the client. |
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*/ |
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static int decode_status(struct xdr_stream *xdr, struct mountres *res) |
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{ |
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unsigned int i; |
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u32 status; |
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__be32 *p; |
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p = xdr_inline_decode(xdr, 4); |
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if (unlikely(p == NULL)) |
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return -EIO; |
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status = be32_to_cpup(p); |
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for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) { |
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if (mnt_errtbl[i].status == status) { |
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res->errno = mnt_errtbl[i].errno; |
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return 0; |
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} |
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} |
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dprintk("NFS: unrecognized MNT status code: %u\n", status); |
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res->errno = -EACCES; |
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return 0; |
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} |
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static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res) |
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{ |
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struct nfs_fh *fh = res->fh; |
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__be32 *p; |
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p = xdr_inline_decode(xdr, NFS2_FHSIZE); |
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if (unlikely(p == NULL)) |
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return -EIO; |
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fh->size = NFS2_FHSIZE; |
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memcpy(fh->data, p, NFS2_FHSIZE); |
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return 0; |
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} |
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static int mnt_xdr_dec_mountres(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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void *data) |
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{ |
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struct mountres *res = data; |
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int status; |
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status = decode_status(xdr, res); |
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if (unlikely(status != 0 || res->errno != 0)) |
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return status; |
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return decode_fhandle(xdr, res); |
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} |
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static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) |
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{ |
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unsigned int i; |
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u32 status; |
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__be32 *p; |
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p = xdr_inline_decode(xdr, 4); |
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if (unlikely(p == NULL)) |
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return -EIO; |
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status = be32_to_cpup(p); |
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for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) { |
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if (mnt3_errtbl[i].status == status) { |
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res->errno = mnt3_errtbl[i].errno; |
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return 0; |
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} |
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} |
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dprintk("NFS: unrecognized MNT3 status code: %u\n", status); |
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res->errno = -EACCES; |
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return 0; |
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} |
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static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res) |
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{ |
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struct nfs_fh *fh = res->fh; |
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u32 size; |
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__be32 *p; |
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p = xdr_inline_decode(xdr, 4); |
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if (unlikely(p == NULL)) |
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return -EIO; |
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size = be32_to_cpup(p); |
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if (size > NFS3_FHSIZE || size == 0) |
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return -EIO; |
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p = xdr_inline_decode(xdr, size); |
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if (unlikely(p == NULL)) |
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return -EIO; |
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fh->size = size; |
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memcpy(fh->data, p, size); |
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return 0; |
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} |
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static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res) |
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{ |
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rpc_authflavor_t *flavors = res->auth_flavors; |
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unsigned int *count = res->auth_count; |
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u32 entries, i; |
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__be32 *p; |
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if (*count == 0) |
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return 0; |
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p = xdr_inline_decode(xdr, 4); |
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if (unlikely(p == NULL)) |
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return -EIO; |
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entries = be32_to_cpup(p); |
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dprintk("NFS: received %u auth flavors\n", entries); |
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if (entries > NFS_MAX_SECFLAVORS) |
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entries = NFS_MAX_SECFLAVORS; |
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p = xdr_inline_decode(xdr, 4 * entries); |
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if (unlikely(p == NULL)) |
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return -EIO; |
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if (entries > *count) |
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entries = *count; |
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for (i = 0; i < entries; i++) { |
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flavors[i] = be32_to_cpup(p++); |
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dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]); |
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} |
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*count = i; |
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return 0; |
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} |
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static int mnt_xdr_dec_mountres3(struct rpc_rqst *req, |
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struct xdr_stream *xdr, |
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void *data) |
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{ |
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struct mountres *res = data; |
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int status; |
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status = decode_fhs_status(xdr, res); |
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if (unlikely(status != 0 || res->errno != 0)) |
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return status; |
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status = decode_fhandle3(xdr, res); |
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if (unlikely(status != 0)) { |
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res->errno = -EBADHANDLE; |
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return 0; |
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} |
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return decode_auth_flavors(xdr, res); |
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} |
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static const struct rpc_procinfo mnt_procedures[] = { |
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[MOUNTPROC_MNT] = { |
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.p_proc = MOUNTPROC_MNT, |
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.p_encode = mnt_xdr_enc_dirpath, |
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.p_decode = mnt_xdr_dec_mountres, |
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.p_arglen = MNT_enc_dirpath_sz, |
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.p_replen = MNT_dec_mountres_sz, |
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.p_statidx = MOUNTPROC_MNT, |
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.p_name = "MOUNT", |
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}, |
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[MOUNTPROC_UMNT] = { |
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.p_proc = MOUNTPROC_UMNT, |
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.p_encode = mnt_xdr_enc_dirpath, |
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.p_arglen = MNT_enc_dirpath_sz, |
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.p_statidx = MOUNTPROC_UMNT, |
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.p_name = "UMOUNT", |
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}, |
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}; |
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static const struct rpc_procinfo mnt3_procedures[] = { |
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[MOUNTPROC3_MNT] = { |
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.p_proc = MOUNTPROC3_MNT, |
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.p_encode = mnt_xdr_enc_dirpath, |
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.p_decode = mnt_xdr_dec_mountres3, |
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.p_arglen = MNT_enc_dirpath_sz, |
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.p_replen = MNT_dec_mountres3_sz, |
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.p_statidx = MOUNTPROC3_MNT, |
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.p_name = "MOUNT", |
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}, |
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[MOUNTPROC3_UMNT] = { |
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.p_proc = MOUNTPROC3_UMNT, |
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.p_encode = mnt_xdr_enc_dirpath, |
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.p_arglen = MNT_enc_dirpath_sz, |
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.p_statidx = MOUNTPROC3_UMNT, |
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.p_name = "UMOUNT", |
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}, |
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}; |
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static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)]; |
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static const struct rpc_version mnt_version1 = { |
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.number = 1, |
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.nrprocs = ARRAY_SIZE(mnt_procedures), |
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.procs = mnt_procedures, |
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.counts = mnt_counts, |
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}; |
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static unsigned int mnt3_counts[ARRAY_SIZE(mnt3_procedures)]; |
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static const struct rpc_version mnt_version3 = { |
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.number = 3, |
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.nrprocs = ARRAY_SIZE(mnt3_procedures), |
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.procs = mnt3_procedures, |
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.counts = mnt3_counts, |
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}; |
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static const struct rpc_version *mnt_version[] = { |
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NULL, |
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&mnt_version1, |
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NULL, |
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&mnt_version3, |
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}; |
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static struct rpc_stat mnt_stats; |
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static const struct rpc_program mnt_program = { |
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.name = "mount", |
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.number = NFS_MNT_PROGRAM, |
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.nrvers = ARRAY_SIZE(mnt_version), |
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.version = mnt_version, |
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.stats = &mnt_stats, |
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};
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