| /* |
| * In-kernel MOUNT protocol client |
| * |
| * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/kernel.h> |
| #include <linux/errno.h> |
| #include <linux/uio.h> |
| #include <linux/net.h> |
| #include <linux/in.h> |
| #include <linux/sunrpc/clnt.h> |
| #include <linux/sunrpc/sched.h> |
| #include <linux/nfs_fs.h> |
| #include "internal.h" |
| |
| #ifdef RPC_DEBUG |
| # define NFSDBG_FACILITY NFSDBG_MOUNT |
| #endif |
| |
| /* |
| * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4 |
| */ |
| #define MNTPATHLEN (1024) |
| |
| /* |
| * XDR data type sizes |
| */ |
| #define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN)) |
| #define MNT_status_sz (1) |
| #define MNT_fhs_status_sz (1) |
| #define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE) |
| #define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE)) |
| #define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS) |
| |
| /* |
| * XDR argument and result sizes |
| */ |
| #define MNT_enc_dirpath_sz encode_dirpath_sz |
| #define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz) |
| #define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandle_sz + \ |
| MNT_authflav3_sz) |
| |
| /* |
| * Defined by RFC 1094, section A.5 |
| */ |
| enum { |
| MOUNTPROC_NULL = 0, |
| MOUNTPROC_MNT = 1, |
| MOUNTPROC_DUMP = 2, |
| MOUNTPROC_UMNT = 3, |
| MOUNTPROC_UMNTALL = 4, |
| MOUNTPROC_EXPORT = 5, |
| }; |
| |
| /* |
| * Defined by RFC 1813, section 5.2 |
| */ |
| enum { |
| MOUNTPROC3_NULL = 0, |
| MOUNTPROC3_MNT = 1, |
| MOUNTPROC3_DUMP = 2, |
| MOUNTPROC3_UMNT = 3, |
| MOUNTPROC3_UMNTALL = 4, |
| MOUNTPROC3_EXPORT = 5, |
| }; |
| |
| static struct rpc_program mnt_program; |
| |
| /* |
| * Defined by OpenGroup XNFS Version 3W, chapter 8 |
| */ |
| enum mountstat { |
| MNT_OK = 0, |
| MNT_EPERM = 1, |
| MNT_ENOENT = 2, |
| MNT_EACCES = 13, |
| MNT_EINVAL = 22, |
| }; |
| |
| static struct { |
| u32 status; |
| int errno; |
| } mnt_errtbl[] = { |
| { .status = MNT_OK, .errno = 0, }, |
| { .status = MNT_EPERM, .errno = -EPERM, }, |
| { .status = MNT_ENOENT, .errno = -ENOENT, }, |
| { .status = MNT_EACCES, .errno = -EACCES, }, |
| { .status = MNT_EINVAL, .errno = -EINVAL, }, |
| }; |
| |
| /* |
| * Defined by RFC 1813, section 5.1.5 |
| */ |
| enum mountstat3 { |
| MNT3_OK = 0, /* no error */ |
| MNT3ERR_PERM = 1, /* Not owner */ |
| MNT3ERR_NOENT = 2, /* No such file or directory */ |
| MNT3ERR_IO = 5, /* I/O error */ |
| MNT3ERR_ACCES = 13, /* Permission denied */ |
| MNT3ERR_NOTDIR = 20, /* Not a directory */ |
| MNT3ERR_INVAL = 22, /* Invalid argument */ |
| MNT3ERR_NAMETOOLONG = 63, /* Filename too long */ |
| MNT3ERR_NOTSUPP = 10004, /* Operation not supported */ |
| MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */ |
| }; |
| |
| static struct { |
| u32 status; |
| int errno; |
| } mnt3_errtbl[] = { |
| { .status = MNT3_OK, .errno = 0, }, |
| { .status = MNT3ERR_PERM, .errno = -EPERM, }, |
| { .status = MNT3ERR_NOENT, .errno = -ENOENT, }, |
| { .status = MNT3ERR_IO, .errno = -EIO, }, |
| { .status = MNT3ERR_ACCES, .errno = -EACCES, }, |
| { .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, }, |
| { .status = MNT3ERR_INVAL, .errno = -EINVAL, }, |
| { .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, }, |
| { .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, }, |
| { .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, }, |
| }; |
| |
| struct mountres { |
| int errno; |
| struct nfs_fh *fh; |
| unsigned int *auth_count; |
| rpc_authflavor_t *auth_flavors; |
| }; |
| |
| struct mnt_fhstatus { |
| u32 status; |
| struct nfs_fh *fh; |
| }; |
| |
| /** |
| * nfs_mount - Obtain an NFS file handle for the given host and path |
| * @info: pointer to mount request arguments |
| * |
| * Uses default timeout parameters specified by underlying transport. |
| */ |
| int nfs_mount(struct nfs_mount_request *info) |
| { |
| struct mountres result = { |
| .fh = info->fh, |
| .auth_count = info->auth_flav_len, |
| .auth_flavors = info->auth_flavs, |
| }; |
| struct rpc_message msg = { |
| .rpc_argp = info->dirpath, |
| .rpc_resp = &result, |
| }; |
| struct rpc_create_args args = { |
| .net = &init_net, |
| .protocol = info->protocol, |
| .address = info->sap, |
| .addrsize = info->salen, |
| .servername = info->hostname, |
| .program = &mnt_program, |
| .version = info->version, |
| .authflavor = RPC_AUTH_UNIX, |
| }; |
| struct rpc_clnt *mnt_clnt; |
| int status; |
| |
| dprintk("NFS: sending MNT request for %s:%s\n", |
| (info->hostname ? info->hostname : "server"), |
| info->dirpath); |
| |
| if (info->noresvport) |
| args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
| |
| mnt_clnt = rpc_create(&args); |
| if (IS_ERR(mnt_clnt)) |
| goto out_clnt_err; |
| |
| if (info->version == NFS_MNT3_VERSION) |
| msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; |
| else |
| msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT]; |
| |
| status = rpc_call_sync(mnt_clnt, &msg, 0); |
| rpc_shutdown_client(mnt_clnt); |
| |
| if (status < 0) |
| goto out_call_err; |
| if (result.errno != 0) |
| goto out_mnt_err; |
| |
| dprintk("NFS: MNT request succeeded\n"); |
| status = 0; |
| |
| out: |
| return status; |
| |
| out_clnt_err: |
| status = PTR_ERR(mnt_clnt); |
| dprintk("NFS: failed to create MNT RPC client, status=%d\n", status); |
| goto out; |
| |
| out_call_err: |
| dprintk("NFS: MNT request failed, status=%d\n", status); |
| goto out; |
| |
| out_mnt_err: |
| dprintk("NFS: MNT server returned result %d\n", result.errno); |
| status = result.errno; |
| goto out; |
| } |
| |
| /** |
| * nfs_umount - Notify a server that we have unmounted this export |
| * @info: pointer to umount request arguments |
| * |
| * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always |
| * use UDP. |
| */ |
| void nfs_umount(const struct nfs_mount_request *info) |
| { |
| static const struct rpc_timeout nfs_umnt_timeout = { |
| .to_initval = 1 * HZ, |
| .to_maxval = 3 * HZ, |
| .to_retries = 2, |
| }; |
| struct rpc_create_args args = { |
| .net = &init_net, |
| .protocol = IPPROTO_UDP, |
| .address = info->sap, |
| .addrsize = info->salen, |
| .timeout = &nfs_umnt_timeout, |
| .servername = info->hostname, |
| .program = &mnt_program, |
| .version = info->version, |
| .authflavor = RPC_AUTH_UNIX, |
| .flags = RPC_CLNT_CREATE_NOPING, |
| }; |
| struct rpc_message msg = { |
| .rpc_argp = info->dirpath, |
| }; |
| struct rpc_clnt *clnt; |
| int status; |
| |
| if (info->noresvport) |
| args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
| |
| clnt = rpc_create(&args); |
| if (unlikely(IS_ERR(clnt))) |
| goto out_clnt_err; |
| |
| dprintk("NFS: sending UMNT request for %s:%s\n", |
| (info->hostname ? info->hostname : "server"), info->dirpath); |
| |
| if (info->version == NFS_MNT3_VERSION) |
| msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT]; |
| else |
| msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT]; |
| |
| status = rpc_call_sync(clnt, &msg, 0); |
| rpc_shutdown_client(clnt); |
| |
| if (unlikely(status < 0)) |
| goto out_call_err; |
| |
| return; |
| |
| out_clnt_err: |
| dprintk("NFS: failed to create UMNT RPC client, status=%ld\n", |
| PTR_ERR(clnt)); |
| return; |
| |
| out_call_err: |
| dprintk("NFS: UMNT request failed, status=%d\n", status); |
| } |
| |
| /* |
| * XDR encode/decode functions for MOUNT |
| */ |
| |
| static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) |
| { |
| const u32 pathname_len = strlen(pathname); |
| __be32 *p; |
| |
| BUG_ON(pathname_len > MNTPATHLEN); |
| p = xdr_reserve_space(xdr, 4 + pathname_len); |
| xdr_encode_opaque(p, pathname, pathname_len); |
| } |
| |
| static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr, |
| const char *dirpath) |
| { |
| encode_mntdirpath(xdr, dirpath); |
| } |
| |
| /* |
| * RFC 1094: "A non-zero status indicates some sort of error. In this |
| * case, the status is a UNIX error number." This can be problematic |
| * if the server and client use different errno values for the same |
| * error. |
| * |
| * However, the OpenGroup XNFS spec provides a simple mapping that is |
| * independent of local errno values on the server and the client. |
| */ |
| static int decode_status(struct xdr_stream *xdr, struct mountres *res) |
| { |
| unsigned int i; |
| u32 status; |
| __be32 *p; |
| |
| p = xdr_inline_decode(xdr, 4); |
| if (unlikely(p == NULL)) |
| return -EIO; |
| status = be32_to_cpup(p); |
| |
| for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) { |
| if (mnt_errtbl[i].status == status) { |
| res->errno = mnt_errtbl[i].errno; |
| return 0; |
| } |
| } |
| |
| dprintk("NFS: unrecognized MNT status code: %u\n", status); |
| res->errno = -EACCES; |
| return 0; |
| } |
| |
| static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res) |
| { |
| struct nfs_fh *fh = res->fh; |
| __be32 *p; |
| |
| p = xdr_inline_decode(xdr, NFS2_FHSIZE); |
| if (unlikely(p == NULL)) |
| return -EIO; |
| |
| fh->size = NFS2_FHSIZE; |
| memcpy(fh->data, p, NFS2_FHSIZE); |
| return 0; |
| } |
| |
| static int mnt_xdr_dec_mountres(struct rpc_rqst *req, |
| struct xdr_stream *xdr, |
| struct mountres *res) |
| { |
| int status; |
| |
| status = decode_status(xdr, res); |
| if (unlikely(status != 0 || res->errno != 0)) |
| return status; |
| return decode_fhandle(xdr, res); |
| } |
| |
| static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) |
| { |
| unsigned int i; |
| u32 status; |
| __be32 *p; |
| |
| p = xdr_inline_decode(xdr, 4); |
| if (unlikely(p == NULL)) |
| return -EIO; |
| status = be32_to_cpup(p); |
| |
| for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) { |
| if (mnt3_errtbl[i].status == status) { |
| res->errno = mnt3_errtbl[i].errno; |
| return 0; |
| } |
| } |
| |
| dprintk("NFS: unrecognized MNT3 status code: %u\n", status); |
| res->errno = -EACCES; |
| return 0; |
| } |
| |
| static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res) |
| { |
| struct nfs_fh *fh = res->fh; |
| u32 size; |
| __be32 *p; |
| |
| p = xdr_inline_decode(xdr, 4); |
| if (unlikely(p == NULL)) |
| return -EIO; |
| |
| size = be32_to_cpup(p); |
| if (size > NFS3_FHSIZE || size == 0) |
| return -EIO; |
| |
| p = xdr_inline_decode(xdr, size); |
| if (unlikely(p == NULL)) |
| return -EIO; |
| |
| fh->size = size; |
| memcpy(fh->data, p, size); |
| return 0; |
| } |
| |
| static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res) |
| { |
| rpc_authflavor_t *flavors = res->auth_flavors; |
| unsigned int *count = res->auth_count; |
| u32 entries, i; |
| __be32 *p; |
| |
| if (*count == 0) |
| return 0; |
| |
| p = xdr_inline_decode(xdr, 4); |
| if (unlikely(p == NULL)) |
| return -EIO; |
| entries = be32_to_cpup(p); |
| dprintk("NFS: received %u auth flavors\n", entries); |
| if (entries > NFS_MAX_SECFLAVORS) |
| entries = NFS_MAX_SECFLAVORS; |
| |
| p = xdr_inline_decode(xdr, 4 * entries); |
| if (unlikely(p == NULL)) |
| return -EIO; |
| |
| if (entries > *count) |
| entries = *count; |
| |
| for (i = 0; i < entries; i++) { |
| flavors[i] = be32_to_cpup(p++); |
| dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]); |
| } |
| *count = i; |
| |
| return 0; |
| } |
| |
| static int mnt_xdr_dec_mountres3(struct rpc_rqst *req, |
| struct xdr_stream *xdr, |
| struct mountres *res) |
| { |
| int status; |
| |
| status = decode_fhs_status(xdr, res); |
| if (unlikely(status != 0 || res->errno != 0)) |
| return status; |
| status = decode_fhandle3(xdr, res); |
| if (unlikely(status != 0)) { |
| res->errno = -EBADHANDLE; |
| return 0; |
| } |
| return decode_auth_flavors(xdr, res); |
| } |
| |
| static struct rpc_procinfo mnt_procedures[] = { |
| [MOUNTPROC_MNT] = { |
| .p_proc = MOUNTPROC_MNT, |
| .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, |
| .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres, |
| .p_arglen = MNT_enc_dirpath_sz, |
| .p_replen = MNT_dec_mountres_sz, |
| .p_statidx = MOUNTPROC_MNT, |
| .p_name = "MOUNT", |
| }, |
| [MOUNTPROC_UMNT] = { |
| .p_proc = MOUNTPROC_UMNT, |
| .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, |
| .p_arglen = MNT_enc_dirpath_sz, |
| .p_statidx = MOUNTPROC_UMNT, |
| .p_name = "UMOUNT", |
| }, |
| }; |
| |
| static struct rpc_procinfo mnt3_procedures[] = { |
| [MOUNTPROC3_MNT] = { |
| .p_proc = MOUNTPROC3_MNT, |
| .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, |
| .p_decode = (kxdrdproc_t)mnt_xdr_dec_mountres3, |
| .p_arglen = MNT_enc_dirpath_sz, |
| .p_replen = MNT_dec_mountres3_sz, |
| .p_statidx = MOUNTPROC3_MNT, |
| .p_name = "MOUNT", |
| }, |
| [MOUNTPROC3_UMNT] = { |
| .p_proc = MOUNTPROC3_UMNT, |
| .p_encode = (kxdreproc_t)mnt_xdr_enc_dirpath, |
| .p_arglen = MNT_enc_dirpath_sz, |
| .p_statidx = MOUNTPROC3_UMNT, |
| .p_name = "UMOUNT", |
| }, |
| }; |
| |
| |
| static struct rpc_version mnt_version1 = { |
| .number = 1, |
| .nrprocs = ARRAY_SIZE(mnt_procedures), |
| .procs = mnt_procedures, |
| }; |
| |
| static struct rpc_version mnt_version3 = { |
| .number = 3, |
| .nrprocs = ARRAY_SIZE(mnt3_procedures), |
| .procs = mnt3_procedures, |
| }; |
| |
| static struct rpc_version *mnt_version[] = { |
| NULL, |
| &mnt_version1, |
| NULL, |
| &mnt_version3, |
| }; |
| |
| static struct rpc_stat mnt_stats; |
| |
| static struct rpc_program mnt_program = { |
| .name = "mount", |
| .number = NFS_MNT_PROGRAM, |
| .nrvers = ARRAY_SIZE(mnt_version), |
| .version = mnt_version, |
| .stats = &mnt_stats, |
| }; |