Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 2 | * In-kernel MOUNT protocol client |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright (C) 1997, Olaf Kirch <okir@monad.swb.de> |
| 5 | */ |
| 6 | |
| 7 | #include <linux/types.h> |
| 8 | #include <linux/socket.h> |
| 9 | #include <linux/kernel.h> |
| 10 | #include <linux/errno.h> |
| 11 | #include <linux/uio.h> |
| 12 | #include <linux/net.h> |
| 13 | #include <linux/in.h> |
| 14 | #include <linux/sunrpc/clnt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/sunrpc/sched.h> |
| 16 | #include <linux/nfs_fs.h> |
Steve Dickson | 8491945 | 2008-04-11 20:03:06 -0400 | [diff] [blame] | 17 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | |
Kinglong Mee | 39de493 | 2015-09-24 20:57:03 +0800 | [diff] [blame] | 19 | #define NFSDBG_FACILITY NFSDBG_MOUNT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | |
Chuck Lever | 2ad7809 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 21 | /* |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 22 | * Defined by RFC 1094, section A.3; and RFC 1813, section 5.1.4 |
| 23 | */ |
| 24 | #define MNTPATHLEN (1024) |
| 25 | |
| 26 | /* |
| 27 | * XDR data type sizes |
| 28 | */ |
| 29 | #define encode_dirpath_sz (1 + XDR_QUADLEN(MNTPATHLEN)) |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 30 | #define MNT_status_sz (1) |
| 31 | #define MNT_fhs_status_sz (1) |
Chuck Lever | 4fdcd99 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 32 | #define MNT_fhandle_sz XDR_QUADLEN(NFS2_FHSIZE) |
| 33 | #define MNT_fhandle3_sz (1 + XDR_QUADLEN(NFS3_FHSIZE)) |
Chuck Lever | a14017d | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 34 | #define MNT_authflav3_sz (1 + NFS_MAX_SECFLAVORS) |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 35 | |
| 36 | /* |
| 37 | * XDR argument and result sizes |
| 38 | */ |
| 39 | #define MNT_enc_dirpath_sz encode_dirpath_sz |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 40 | #define MNT_dec_mountres_sz (MNT_status_sz + MNT_fhandle_sz) |
| 41 | #define MNT_dec_mountres3_sz (MNT_status_sz + MNT_fhandle_sz + \ |
| 42 | MNT_authflav3_sz) |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 43 | |
| 44 | /* |
Chuck Lever | 2ad7809 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 45 | * Defined by RFC 1094, section A.5 |
| 46 | */ |
| 47 | enum { |
| 48 | MOUNTPROC_NULL = 0, |
| 49 | MOUNTPROC_MNT = 1, |
| 50 | MOUNTPROC_DUMP = 2, |
| 51 | MOUNTPROC_UMNT = 3, |
| 52 | MOUNTPROC_UMNTALL = 4, |
| 53 | MOUNTPROC_EXPORT = 5, |
| 54 | }; |
| 55 | |
| 56 | /* |
| 57 | * Defined by RFC 1813, section 5.2 |
| 58 | */ |
| 59 | enum { |
| 60 | MOUNTPROC3_NULL = 0, |
| 61 | MOUNTPROC3_MNT = 1, |
| 62 | MOUNTPROC3_DUMP = 2, |
| 63 | MOUNTPROC3_UMNT = 3, |
| 64 | MOUNTPROC3_UMNTALL = 4, |
| 65 | MOUNTPROC3_EXPORT = 5, |
| 66 | }; |
| 67 | |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 68 | static const struct rpc_program mnt_program; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 70 | /* |
| 71 | * Defined by OpenGroup XNFS Version 3W, chapter 8 |
| 72 | */ |
| 73 | enum mountstat { |
| 74 | MNT_OK = 0, |
| 75 | MNT_EPERM = 1, |
| 76 | MNT_ENOENT = 2, |
| 77 | MNT_EACCES = 13, |
| 78 | MNT_EINVAL = 22, |
| 79 | }; |
| 80 | |
| 81 | static struct { |
| 82 | u32 status; |
| 83 | int errno; |
| 84 | } mnt_errtbl[] = { |
| 85 | { .status = MNT_OK, .errno = 0, }, |
| 86 | { .status = MNT_EPERM, .errno = -EPERM, }, |
| 87 | { .status = MNT_ENOENT, .errno = -ENOENT, }, |
| 88 | { .status = MNT_EACCES, .errno = -EACCES, }, |
| 89 | { .status = MNT_EINVAL, .errno = -EINVAL, }, |
| 90 | }; |
| 91 | |
| 92 | /* |
| 93 | * Defined by RFC 1813, section 5.1.5 |
| 94 | */ |
| 95 | enum mountstat3 { |
| 96 | MNT3_OK = 0, /* no error */ |
| 97 | MNT3ERR_PERM = 1, /* Not owner */ |
| 98 | MNT3ERR_NOENT = 2, /* No such file or directory */ |
| 99 | MNT3ERR_IO = 5, /* I/O error */ |
| 100 | MNT3ERR_ACCES = 13, /* Permission denied */ |
| 101 | MNT3ERR_NOTDIR = 20, /* Not a directory */ |
| 102 | MNT3ERR_INVAL = 22, /* Invalid argument */ |
| 103 | MNT3ERR_NAMETOOLONG = 63, /* Filename too long */ |
| 104 | MNT3ERR_NOTSUPP = 10004, /* Operation not supported */ |
| 105 | MNT3ERR_SERVERFAULT = 10006, /* A failure on the server */ |
| 106 | }; |
| 107 | |
| 108 | static struct { |
| 109 | u32 status; |
| 110 | int errno; |
| 111 | } mnt3_errtbl[] = { |
| 112 | { .status = MNT3_OK, .errno = 0, }, |
| 113 | { .status = MNT3ERR_PERM, .errno = -EPERM, }, |
| 114 | { .status = MNT3ERR_NOENT, .errno = -ENOENT, }, |
| 115 | { .status = MNT3ERR_IO, .errno = -EIO, }, |
| 116 | { .status = MNT3ERR_ACCES, .errno = -EACCES, }, |
| 117 | { .status = MNT3ERR_NOTDIR, .errno = -ENOTDIR, }, |
| 118 | { .status = MNT3ERR_INVAL, .errno = -EINVAL, }, |
| 119 | { .status = MNT3ERR_NAMETOOLONG, .errno = -ENAMETOOLONG, }, |
| 120 | { .status = MNT3ERR_NOTSUPP, .errno = -ENOTSUPP, }, |
Trond Myklebust | fdcb457 | 2010-02-08 09:32:40 -0500 | [diff] [blame] | 121 | { .status = MNT3ERR_SERVERFAULT, .errno = -EREMOTEIO, }, |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 122 | }; |
| 123 | |
| 124 | struct mountres { |
| 125 | int errno; |
| 126 | struct nfs_fh *fh; |
Chuck Lever | a14017d | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 127 | unsigned int *auth_count; |
| 128 | rpc_authflavor_t *auth_flavors; |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 129 | }; |
| 130 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | struct mnt_fhstatus { |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 132 | u32 status; |
| 133 | struct nfs_fh *fh; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | }; |
| 135 | |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 136 | /** |
| 137 | * nfs_mount - Obtain an NFS file handle for the given host and path |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 138 | * @info: pointer to mount request arguments |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 139 | * |
Jeff Layton | fb9b02f | 2013-06-27 15:54:40 -0400 | [diff] [blame] | 140 | * Uses default timeout parameters specified by underlying transport. On |
| 141 | * successful return, the auth_flavs list and auth_flav_len will be populated |
| 142 | * with the list from the server or a faked-up list if the server didn't |
| 143 | * provide one. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | */ |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 145 | int nfs_mount(struct nfs_mount_request *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | { |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 147 | struct mountres result = { |
| 148 | .fh = info->fh, |
| 149 | .auth_count = info->auth_flav_len, |
| 150 | .auth_flavors = info->auth_flavs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | }; |
Chuck Lever | dead28d | 2006-03-20 13:44:23 -0500 | [diff] [blame] | 152 | struct rpc_message msg = { |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 153 | .rpc_argp = info->dirpath, |
Chuck Lever | dead28d | 2006-03-20 13:44:23 -0500 | [diff] [blame] | 154 | .rpc_resp = &result, |
| 155 | }; |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 156 | struct rpc_create_args args = { |
Stanislav Kinsbursky | 6d59b8d | 2012-01-10 16:12:54 +0400 | [diff] [blame] | 157 | .net = info->net, |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 158 | .protocol = info->protocol, |
| 159 | .address = info->sap, |
| 160 | .addrsize = info->salen, |
| 161 | .servername = info->hostname, |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 162 | .program = &mnt_program, |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 163 | .version = info->version, |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 164 | .authflavor = RPC_AUTH_UNIX, |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 165 | }; |
| 166 | struct rpc_clnt *mnt_clnt; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 169 | dprintk("NFS: sending MNT request for %s:%s\n", |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 170 | (info->hostname ? info->hostname : "server"), |
| 171 | info->dirpath); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
Trond Myklebust | 28d79ea | 2012-10-15 16:25:42 -0400 | [diff] [blame] | 173 | if (strlen(info->dirpath) > MNTPATHLEN) |
| 174 | return -ENAMETOOLONG; |
| 175 | |
Chuck Lever | 50a737f | 2008-12-23 15:21:37 -0500 | [diff] [blame] | 176 | if (info->noresvport) |
| 177 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
| 178 | |
Chuck Lever | 3ea9730 | 2007-07-01 12:13:27 -0400 | [diff] [blame] | 179 | mnt_clnt = rpc_create(&args); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | if (IS_ERR(mnt_clnt)) |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 181 | goto out_clnt_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | |
Chuck Lever | c5d120f | 2008-12-23 15:21:35 -0500 | [diff] [blame] | 183 | if (info->version == NFS_MNT3_VERSION) |
Chuck Lever | dead28d | 2006-03-20 13:44:23 -0500 | [diff] [blame] | 184 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC3_MNT]; |
| 185 | else |
Chuck Lever | 2ad7809 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 186 | msg.rpc_proc = &mnt_clnt->cl_procinfo[MOUNTPROC_MNT]; |
Chuck Lever | dead28d | 2006-03-20 13:44:23 -0500 | [diff] [blame] | 187 | |
Scott Mayhew | acce94e | 2012-10-16 13:22:19 -0400 | [diff] [blame] | 188 | status = rpc_call_sync(mnt_clnt, &msg, RPC_TASK_SOFT|RPC_TASK_TIMEOUT); |
Trond Myklebust | 90c5755 | 2007-06-09 19:49:36 -0400 | [diff] [blame] | 189 | rpc_shutdown_client(mnt_clnt); |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 190 | |
| 191 | if (status < 0) |
| 192 | goto out_call_err; |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 193 | if (result.errno != 0) |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 194 | goto out_mnt_err; |
| 195 | |
| 196 | dprintk("NFS: MNT request succeeded\n"); |
| 197 | status = 0; |
| 198 | |
Jeff Layton | fb9b02f | 2013-06-27 15:54:40 -0400 | [diff] [blame] | 199 | /* |
| 200 | * If the server didn't provide a flavor list, allow the |
| 201 | * client to try any flavor. |
| 202 | */ |
| 203 | if (info->version != NFS_MNT3_VERSION || *info->auth_flav_len == 0) { |
| 204 | dprintk("NFS: Faking up auth_flavs list\n"); |
| 205 | info->auth_flavs[0] = RPC_AUTH_NULL; |
| 206 | *info->auth_flav_len = 1; |
| 207 | } |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 208 | out: |
| 209 | return status; |
| 210 | |
| 211 | out_clnt_err: |
| 212 | status = PTR_ERR(mnt_clnt); |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 213 | dprintk("NFS: failed to create MNT RPC client, status=%d\n", status); |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 214 | goto out; |
| 215 | |
| 216 | out_call_err: |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 217 | dprintk("NFS: MNT request failed, status=%d\n", status); |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 218 | goto out; |
| 219 | |
| 220 | out_mnt_err: |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 221 | dprintk("NFS: MNT server returned result %d\n", result.errno); |
| 222 | status = result.errno; |
Chuck Lever | 013a8c1 | 2007-07-01 12:13:38 -0400 | [diff] [blame] | 223 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | } |
| 225 | |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 226 | /** |
| 227 | * nfs_umount - Notify a server that we have unmounted this export |
| 228 | * @info: pointer to umount request arguments |
| 229 | * |
| 230 | * MOUNTPROC_UMNT is advisory, so we set a short timeout, and always |
| 231 | * use UDP. |
| 232 | */ |
| 233 | void nfs_umount(const struct nfs_mount_request *info) |
| 234 | { |
| 235 | static const struct rpc_timeout nfs_umnt_timeout = { |
| 236 | .to_initval = 1 * HZ, |
| 237 | .to_maxval = 3 * HZ, |
| 238 | .to_retries = 2, |
| 239 | }; |
| 240 | struct rpc_create_args args = { |
Stanislav Kinsbursky | 6d59b8d | 2012-01-10 16:12:54 +0400 | [diff] [blame] | 241 | .net = info->net, |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 242 | .protocol = IPPROTO_UDP, |
| 243 | .address = info->sap, |
| 244 | .addrsize = info->salen, |
| 245 | .timeout = &nfs_umnt_timeout, |
| 246 | .servername = info->hostname, |
| 247 | .program = &mnt_program, |
| 248 | .version = info->version, |
| 249 | .authflavor = RPC_AUTH_UNIX, |
| 250 | .flags = RPC_CLNT_CREATE_NOPING, |
| 251 | }; |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 252 | struct rpc_message msg = { |
| 253 | .rpc_argp = info->dirpath, |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 254 | }; |
| 255 | struct rpc_clnt *clnt; |
| 256 | int status; |
| 257 | |
Trond Myklebust | 28d79ea | 2012-10-15 16:25:42 -0400 | [diff] [blame] | 258 | if (strlen(info->dirpath) > MNTPATHLEN) |
| 259 | return; |
| 260 | |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 261 | if (info->noresvport) |
| 262 | args.flags |= RPC_CLNT_CREATE_NONPRIVPORT; |
| 263 | |
| 264 | clnt = rpc_create(&args); |
Tobias Klauser | c8b031e | 2010-12-09 15:53:28 +0100 | [diff] [blame] | 265 | if (IS_ERR(clnt)) |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 266 | goto out_clnt_err; |
| 267 | |
| 268 | dprintk("NFS: sending UMNT request for %s:%s\n", |
| 269 | (info->hostname ? info->hostname : "server"), info->dirpath); |
| 270 | |
| 271 | if (info->version == NFS_MNT3_VERSION) |
| 272 | msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC3_UMNT]; |
| 273 | else |
| 274 | msg.rpc_proc = &clnt->cl_procinfo[MOUNTPROC_UMNT]; |
| 275 | |
| 276 | status = rpc_call_sync(clnt, &msg, 0); |
| 277 | rpc_shutdown_client(clnt); |
| 278 | |
| 279 | if (unlikely(status < 0)) |
| 280 | goto out_call_err; |
| 281 | |
| 282 | return; |
| 283 | |
| 284 | out_clnt_err: |
| 285 | dprintk("NFS: failed to create UMNT RPC client, status=%ld\n", |
| 286 | PTR_ERR(clnt)); |
| 287 | return; |
| 288 | |
| 289 | out_call_err: |
| 290 | dprintk("NFS: UMNT request failed, status=%d\n", status); |
| 291 | } |
| 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | /* |
| 294 | * XDR encode/decode functions for MOUNT |
| 295 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 297 | static void encode_mntdirpath(struct xdr_stream *xdr, const char *pathname) |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 298 | { |
| 299 | const u32 pathname_len = strlen(pathname); |
| 300 | __be32 *p; |
| 301 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 302 | p = xdr_reserve_space(xdr, 4 + pathname_len); |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 303 | xdr_encode_opaque(p, pathname, pathname_len); |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 304 | } |
| 305 | |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 306 | static void mnt_xdr_enc_dirpath(struct rpc_rqst *req, struct xdr_stream *xdr, |
Christoph Hellwig | 0096d39 | 2017-05-08 10:01:49 +0200 | [diff] [blame] | 307 | const void *dirpath) |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 308 | { |
Chuck Lever | 9f06c71 | 2010-12-14 14:59:18 +0000 | [diff] [blame] | 309 | encode_mntdirpath(xdr, dirpath); |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 310 | } |
| 311 | |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 312 | /* |
| 313 | * RFC 1094: "A non-zero status indicates some sort of error. In this |
| 314 | * case, the status is a UNIX error number." This can be problematic |
| 315 | * if the server and client use different errno values for the same |
| 316 | * error. |
| 317 | * |
| 318 | * However, the OpenGroup XNFS spec provides a simple mapping that is |
| 319 | * independent of local errno values on the server and the client. |
| 320 | */ |
| 321 | static int decode_status(struct xdr_stream *xdr, struct mountres *res) |
| 322 | { |
| 323 | unsigned int i; |
| 324 | u32 status; |
| 325 | __be32 *p; |
| 326 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 327 | p = xdr_inline_decode(xdr, 4); |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 328 | if (unlikely(p == NULL)) |
| 329 | return -EIO; |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 330 | status = be32_to_cpup(p); |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 331 | |
Roel Kluin | dd8ac1d | 2009-08-09 15:06:19 -0400 | [diff] [blame] | 332 | for (i = 0; i < ARRAY_SIZE(mnt_errtbl); i++) { |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 333 | if (mnt_errtbl[i].status == status) { |
| 334 | res->errno = mnt_errtbl[i].errno; |
| 335 | return 0; |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | dprintk("NFS: unrecognized MNT status code: %u\n", status); |
| 340 | res->errno = -EACCES; |
| 341 | return 0; |
| 342 | } |
| 343 | |
Chuck Lever | 4fdcd99 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 344 | static int decode_fhandle(struct xdr_stream *xdr, struct mountres *res) |
| 345 | { |
| 346 | struct nfs_fh *fh = res->fh; |
| 347 | __be32 *p; |
| 348 | |
| 349 | p = xdr_inline_decode(xdr, NFS2_FHSIZE); |
| 350 | if (unlikely(p == NULL)) |
| 351 | return -EIO; |
| 352 | |
| 353 | fh->size = NFS2_FHSIZE; |
| 354 | memcpy(fh->data, p, NFS2_FHSIZE); |
| 355 | return 0; |
| 356 | } |
| 357 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 358 | static int mnt_xdr_dec_mountres(struct rpc_rqst *req, |
| 359 | struct xdr_stream *xdr, |
Christoph Hellwig | 18d9cff | 2017-05-08 15:09:02 +0200 | [diff] [blame] | 360 | void *data) |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 361 | { |
Christoph Hellwig | 18d9cff | 2017-05-08 15:09:02 +0200 | [diff] [blame] | 362 | struct mountres *res = data; |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 363 | int status; |
| 364 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 365 | status = decode_status(xdr, res); |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 366 | if (unlikely(status != 0 || res->errno != 0)) |
| 367 | return status; |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 368 | return decode_fhandle(xdr, res); |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 369 | } |
| 370 | |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 371 | static int decode_fhs_status(struct xdr_stream *xdr, struct mountres *res) |
| 372 | { |
| 373 | unsigned int i; |
| 374 | u32 status; |
| 375 | __be32 *p; |
| 376 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 377 | p = xdr_inline_decode(xdr, 4); |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 378 | if (unlikely(p == NULL)) |
| 379 | return -EIO; |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 380 | status = be32_to_cpup(p); |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 381 | |
Roel Kluin | dd8ac1d | 2009-08-09 15:06:19 -0400 | [diff] [blame] | 382 | for (i = 0; i < ARRAY_SIZE(mnt3_errtbl); i++) { |
Chuck Lever | fb12529 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 383 | if (mnt3_errtbl[i].status == status) { |
| 384 | res->errno = mnt3_errtbl[i].errno; |
| 385 | return 0; |
| 386 | } |
| 387 | } |
| 388 | |
| 389 | dprintk("NFS: unrecognized MNT3 status code: %u\n", status); |
| 390 | res->errno = -EACCES; |
| 391 | return 0; |
| 392 | } |
| 393 | |
Chuck Lever | 4fdcd99 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 394 | static int decode_fhandle3(struct xdr_stream *xdr, struct mountres *res) |
| 395 | { |
| 396 | struct nfs_fh *fh = res->fh; |
| 397 | u32 size; |
| 398 | __be32 *p; |
| 399 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 400 | p = xdr_inline_decode(xdr, 4); |
Chuck Lever | 4fdcd99 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 401 | if (unlikely(p == NULL)) |
| 402 | return -EIO; |
| 403 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 404 | size = be32_to_cpup(p); |
Chuck Lever | 4fdcd99 | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 405 | if (size > NFS3_FHSIZE || size == 0) |
| 406 | return -EIO; |
| 407 | |
| 408 | p = xdr_inline_decode(xdr, size); |
| 409 | if (unlikely(p == NULL)) |
| 410 | return -EIO; |
| 411 | |
| 412 | fh->size = size; |
| 413 | memcpy(fh->data, p, size); |
| 414 | return 0; |
| 415 | } |
| 416 | |
Chuck Lever | a14017d | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 417 | static int decode_auth_flavors(struct xdr_stream *xdr, struct mountres *res) |
| 418 | { |
| 419 | rpc_authflavor_t *flavors = res->auth_flavors; |
| 420 | unsigned int *count = res->auth_count; |
| 421 | u32 entries, i; |
| 422 | __be32 *p; |
| 423 | |
| 424 | if (*count == 0) |
| 425 | return 0; |
| 426 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 427 | p = xdr_inline_decode(xdr, 4); |
Chuck Lever | a14017d | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 428 | if (unlikely(p == NULL)) |
| 429 | return -EIO; |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 430 | entries = be32_to_cpup(p); |
Chuck Lever | a14017d | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 431 | dprintk("NFS: received %u auth flavors\n", entries); |
| 432 | if (entries > NFS_MAX_SECFLAVORS) |
| 433 | entries = NFS_MAX_SECFLAVORS; |
| 434 | |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 435 | p = xdr_inline_decode(xdr, 4 * entries); |
Chuck Lever | a14017d | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 436 | if (unlikely(p == NULL)) |
| 437 | return -EIO; |
| 438 | |
| 439 | if (entries > *count) |
| 440 | entries = *count; |
| 441 | |
| 442 | for (i = 0; i < entries; i++) { |
Chuck Lever | 98eb2b4 | 2010-12-14 14:58:40 +0000 | [diff] [blame] | 443 | flavors[i] = be32_to_cpup(p++); |
Chuck Lever | ed58b29 | 2010-09-17 10:54:37 -0400 | [diff] [blame] | 444 | dprintk("NFS: auth flavor[%u]: %d\n", i, flavors[i]); |
Chuck Lever | a14017d | 2009-06-17 18:02:12 -0700 | [diff] [blame] | 445 | } |
| 446 | *count = i; |
| 447 | |
| 448 | return 0; |
| 449 | } |
| 450 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 451 | static int mnt_xdr_dec_mountres3(struct rpc_rqst *req, |
| 452 | struct xdr_stream *xdr, |
Christoph Hellwig | 18d9cff | 2017-05-08 15:09:02 +0200 | [diff] [blame] | 453 | void *data) |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 454 | { |
Christoph Hellwig | 18d9cff | 2017-05-08 15:09:02 +0200 | [diff] [blame] | 455 | struct mountres *res = data; |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 456 | int status; |
| 457 | |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 458 | status = decode_fhs_status(xdr, res); |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 459 | if (unlikely(status != 0 || res->errno != 0)) |
| 460 | return status; |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 461 | status = decode_fhandle3(xdr, res); |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 462 | if (unlikely(status != 0)) { |
| 463 | res->errno = -EBADHANDLE; |
| 464 | return 0; |
| 465 | } |
Chuck Lever | bf26955 | 2010-12-14 14:59:29 +0000 | [diff] [blame] | 466 | return decode_auth_flavors(xdr, res); |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 467 | } |
| 468 | |
Christoph Hellwig | 499b498 | 2017-05-12 15:36:49 +0200 | [diff] [blame] | 469 | static const struct rpc_procinfo mnt_procedures[] = { |
Chuck Lever | 2ad7809 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 470 | [MOUNTPROC_MNT] = { |
| 471 | .p_proc = MOUNTPROC_MNT, |
Christoph Hellwig | 0096d39 | 2017-05-08 10:01:49 +0200 | [diff] [blame] | 472 | .p_encode = mnt_xdr_enc_dirpath, |
Christoph Hellwig | 18d9cff | 2017-05-08 15:09:02 +0200 | [diff] [blame] | 473 | .p_decode = mnt_xdr_dec_mountres, |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 474 | .p_arglen = MNT_enc_dirpath_sz, |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 475 | .p_replen = MNT_dec_mountres_sz, |
Chuck Lever | 2ad7809 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 476 | .p_statidx = MOUNTPROC_MNT, |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 477 | .p_name = "MOUNT", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | }, |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 479 | [MOUNTPROC_UMNT] = { |
| 480 | .p_proc = MOUNTPROC_UMNT, |
Christoph Hellwig | 0096d39 | 2017-05-08 10:01:49 +0200 | [diff] [blame] | 481 | .p_encode = mnt_xdr_enc_dirpath, |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 482 | .p_arglen = MNT_enc_dirpath_sz, |
| 483 | .p_statidx = MOUNTPROC_UMNT, |
| 484 | .p_name = "UMOUNT", |
| 485 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | }; |
| 487 | |
Christoph Hellwig | 499b498 | 2017-05-12 15:36:49 +0200 | [diff] [blame] | 488 | static const struct rpc_procinfo mnt3_procedures[] = { |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 489 | [MOUNTPROC3_MNT] = { |
| 490 | .p_proc = MOUNTPROC3_MNT, |
Christoph Hellwig | 0096d39 | 2017-05-08 10:01:49 +0200 | [diff] [blame] | 491 | .p_encode = mnt_xdr_enc_dirpath, |
Christoph Hellwig | 18d9cff | 2017-05-08 15:09:02 +0200 | [diff] [blame] | 492 | .p_decode = mnt_xdr_dec_mountres3, |
Chuck Lever | 29a1bd6 | 2009-06-17 18:02:11 -0700 | [diff] [blame] | 493 | .p_arglen = MNT_enc_dirpath_sz, |
Chuck Lever | 8e02f6b | 2009-06-17 18:02:13 -0700 | [diff] [blame] | 494 | .p_replen = MNT_dec_mountres3_sz, |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 495 | .p_statidx = MOUNTPROC3_MNT, |
| 496 | .p_name = "MOUNT", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | }, |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 498 | [MOUNTPROC3_UMNT] = { |
| 499 | .p_proc = MOUNTPROC3_UMNT, |
Christoph Hellwig | 0096d39 | 2017-05-08 10:01:49 +0200 | [diff] [blame] | 500 | .p_encode = mnt_xdr_enc_dirpath, |
Chuck Lever | 0b52412 | 2009-08-09 15:09:30 -0400 | [diff] [blame] | 501 | .p_arglen = MNT_enc_dirpath_sz, |
| 502 | .p_statidx = MOUNTPROC3_UMNT, |
| 503 | .p_name = "UMOUNT", |
| 504 | }, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | }; |
| 506 | |
Christoph Hellwig | 1c5876d | 2017-05-08 23:27:10 +0200 | [diff] [blame] | 507 | static unsigned int mnt_counts[ARRAY_SIZE(mnt_procedures)]; |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 508 | static const struct rpc_version mnt_version1 = { |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 509 | .number = 1, |
Chuck Lever | 5b362ac | 2010-12-10 12:31:14 -0500 | [diff] [blame] | 510 | .nrprocs = ARRAY_SIZE(mnt_procedures), |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 511 | .procs = mnt_procedures, |
Christoph Hellwig | 1c5876d | 2017-05-08 23:27:10 +0200 | [diff] [blame] | 512 | .counts = mnt_counts, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | }; |
| 514 | |
Christoph Hellwig | 1c5876d | 2017-05-08 23:27:10 +0200 | [diff] [blame] | 515 | static unsigned int mnt3_counts[ARRAY_SIZE(mnt_procedures)]; |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 516 | static const struct rpc_version mnt_version3 = { |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 517 | .number = 3, |
Chuck Lever | 5b362ac | 2010-12-10 12:31:14 -0500 | [diff] [blame] | 518 | .nrprocs = ARRAY_SIZE(mnt3_procedures), |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 519 | .procs = mnt3_procedures, |
Christoph Hellwig | 1c5876d | 2017-05-08 23:27:10 +0200 | [diff] [blame] | 520 | .counts = mnt3_counts, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | }; |
| 522 | |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 523 | static const struct rpc_version *mnt_version[] = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | NULL, |
| 525 | &mnt_version1, |
| 526 | NULL, |
| 527 | &mnt_version3, |
| 528 | }; |
| 529 | |
Chuck Lever | 1920723 | 2007-07-01 12:13:33 -0400 | [diff] [blame] | 530 | static struct rpc_stat mnt_stats; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | |
Trond Myklebust | a613fa1 | 2012-01-20 13:53:56 -0500 | [diff] [blame] | 532 | static const struct rpc_program mnt_program = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | .name = "mount", |
| 534 | .number = NFS_MNT_PROGRAM, |
Tobias Klauser | e8c96f8 | 2006-03-24 03:15:34 -0800 | [diff] [blame] | 535 | .nrvers = ARRAY_SIZE(mnt_version), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | .version = mnt_version, |
| 537 | .stats = &mnt_stats, |
| 538 | }; |