| 1 | /* |
| 2 | * fs/cifs/connect.c |
| 3 | * |
| 4 | * Copyright (C) International Business Machines Corp., 2002,2011 |
| 5 | * Author(s): Steve French (sfrench@us.ibm.com) |
| 6 | * |
| 7 | * This library is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU Lesser General Public License as published |
| 9 | * by the Free Software Foundation; either version 2.1 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This library is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 15 | * the GNU Lesser General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU Lesser General Public License |
| 18 | * along with this library; if not, write to the Free Software |
| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 20 | */ |
| 21 | #include <linux/fs.h> |
| 22 | #include <linux/net.h> |
| 23 | #include <linux/string.h> |
| 24 | #include <linux/list.h> |
| 25 | #include <linux/wait.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/pagemap.h> |
| 28 | #include <linux/ctype.h> |
| 29 | #include <linux/utsname.h> |
| 30 | #include <linux/mempool.h> |
| 31 | #include <linux/delay.h> |
| 32 | #include <linux/completion.h> |
| 33 | #include <linux/kthread.h> |
| 34 | #include <linux/pagevec.h> |
| 35 | #include <linux/freezer.h> |
| 36 | #include <linux/namei.h> |
| 37 | #include <asm/uaccess.h> |
| 38 | #include <asm/processor.h> |
| 39 | #include <linux/inet.h> |
| 40 | #include <linux/module.h> |
| 41 | #include <keys/user-type.h> |
| 42 | #include <net/ipv6.h> |
| 43 | #include <linux/parser.h> |
| 44 | |
| 45 | #include "cifspdu.h" |
| 46 | #include "cifsglob.h" |
| 47 | #include "cifsproto.h" |
| 48 | #include "cifs_unicode.h" |
| 49 | #include "cifs_debug.h" |
| 50 | #include "cifs_fs_sb.h" |
| 51 | #include "ntlmssp.h" |
| 52 | #include "nterr.h" |
| 53 | #include "rfc1002pdu.h" |
| 54 | #include "fscache.h" |
| 55 | |
| 56 | #define CIFS_PORT 445 |
| 57 | #define RFC1001_PORT 139 |
| 58 | |
| 59 | extern mempool_t *cifs_req_poolp; |
| 60 | |
| 61 | /* FIXME: should these be tunable? */ |
| 62 | #define TLINK_ERROR_EXPIRE (1 * HZ) |
| 63 | #define TLINK_IDLE_EXPIRE (600 * HZ) |
| 64 | |
| 65 | enum { |
| 66 | |
| 67 | /* Mount options that take no arguments */ |
| 68 | Opt_user_xattr, Opt_nouser_xattr, |
| 69 | Opt_forceuid, Opt_noforceuid, |
| 70 | Opt_forcegid, Opt_noforcegid, |
| 71 | Opt_noblocksend, Opt_noautotune, |
| 72 | Opt_hard, Opt_soft, Opt_perm, Opt_noperm, |
| 73 | Opt_mapchars, Opt_nomapchars, Opt_sfu, |
| 74 | Opt_nosfu, Opt_nodfs, Opt_posixpaths, |
| 75 | Opt_noposixpaths, Opt_nounix, |
| 76 | Opt_nocase, |
| 77 | Opt_brl, Opt_nobrl, |
| 78 | Opt_forcemandatorylock, Opt_setuids, |
| 79 | Opt_nosetuids, Opt_dynperm, Opt_nodynperm, |
| 80 | Opt_nohard, Opt_nosoft, |
| 81 | Opt_nointr, Opt_intr, |
| 82 | Opt_nostrictsync, Opt_strictsync, |
| 83 | Opt_serverino, Opt_noserverino, |
| 84 | Opt_rwpidforward, Opt_cifsacl, Opt_nocifsacl, |
| 85 | Opt_acl, Opt_noacl, Opt_locallease, |
| 86 | Opt_sign, Opt_seal, Opt_noac, |
| 87 | Opt_fsc, Opt_mfsymlinks, |
| 88 | Opt_multiuser, Opt_sloppy, |
| 89 | |
| 90 | /* Mount options which take numeric value */ |
| 91 | Opt_backupuid, Opt_backupgid, Opt_uid, |
| 92 | Opt_cruid, Opt_gid, Opt_file_mode, |
| 93 | Opt_dirmode, Opt_port, |
| 94 | Opt_rsize, Opt_wsize, Opt_actimeo, |
| 95 | |
| 96 | /* Mount options which take string value */ |
| 97 | Opt_user, Opt_pass, Opt_ip, |
| 98 | Opt_domain, Opt_srcaddr, Opt_iocharset, |
| 99 | Opt_netbiosname, Opt_servern, |
| 100 | Opt_ver, Opt_vers, Opt_sec, Opt_cache, |
| 101 | |
| 102 | /* Mount options to be ignored */ |
| 103 | Opt_ignore, |
| 104 | |
| 105 | /* Options which could be blank */ |
| 106 | Opt_blank_pass, |
| 107 | Opt_blank_user, |
| 108 | Opt_blank_ip, |
| 109 | |
| 110 | Opt_err |
| 111 | }; |
| 112 | |
| 113 | static const match_table_t cifs_mount_option_tokens = { |
| 114 | |
| 115 | { Opt_user_xattr, "user_xattr" }, |
| 116 | { Opt_nouser_xattr, "nouser_xattr" }, |
| 117 | { Opt_forceuid, "forceuid" }, |
| 118 | { Opt_noforceuid, "noforceuid" }, |
| 119 | { Opt_forcegid, "forcegid" }, |
| 120 | { Opt_noforcegid, "noforcegid" }, |
| 121 | { Opt_noblocksend, "noblocksend" }, |
| 122 | { Opt_noautotune, "noautotune" }, |
| 123 | { Opt_hard, "hard" }, |
| 124 | { Opt_soft, "soft" }, |
| 125 | { Opt_perm, "perm" }, |
| 126 | { Opt_noperm, "noperm" }, |
| 127 | { Opt_mapchars, "mapchars" }, |
| 128 | { Opt_nomapchars, "nomapchars" }, |
| 129 | { Opt_sfu, "sfu" }, |
| 130 | { Opt_nosfu, "nosfu" }, |
| 131 | { Opt_nodfs, "nodfs" }, |
| 132 | { Opt_posixpaths, "posixpaths" }, |
| 133 | { Opt_noposixpaths, "noposixpaths" }, |
| 134 | { Opt_nounix, "nounix" }, |
| 135 | { Opt_nounix, "nolinux" }, |
| 136 | { Opt_nocase, "nocase" }, |
| 137 | { Opt_nocase, "ignorecase" }, |
| 138 | { Opt_brl, "brl" }, |
| 139 | { Opt_nobrl, "nobrl" }, |
| 140 | { Opt_nobrl, "nolock" }, |
| 141 | { Opt_forcemandatorylock, "forcemandatorylock" }, |
| 142 | { Opt_forcemandatorylock, "forcemand" }, |
| 143 | { Opt_setuids, "setuids" }, |
| 144 | { Opt_nosetuids, "nosetuids" }, |
| 145 | { Opt_dynperm, "dynperm" }, |
| 146 | { Opt_nodynperm, "nodynperm" }, |
| 147 | { Opt_nohard, "nohard" }, |
| 148 | { Opt_nosoft, "nosoft" }, |
| 149 | { Opt_nointr, "nointr" }, |
| 150 | { Opt_intr, "intr" }, |
| 151 | { Opt_nostrictsync, "nostrictsync" }, |
| 152 | { Opt_strictsync, "strictsync" }, |
| 153 | { Opt_serverino, "serverino" }, |
| 154 | { Opt_noserverino, "noserverino" }, |
| 155 | { Opt_rwpidforward, "rwpidforward" }, |
| 156 | { Opt_cifsacl, "cifsacl" }, |
| 157 | { Opt_nocifsacl, "nocifsacl" }, |
| 158 | { Opt_acl, "acl" }, |
| 159 | { Opt_noacl, "noacl" }, |
| 160 | { Opt_locallease, "locallease" }, |
| 161 | { Opt_sign, "sign" }, |
| 162 | { Opt_seal, "seal" }, |
| 163 | { Opt_noac, "noac" }, |
| 164 | { Opt_fsc, "fsc" }, |
| 165 | { Opt_mfsymlinks, "mfsymlinks" }, |
| 166 | { Opt_multiuser, "multiuser" }, |
| 167 | { Opt_sloppy, "sloppy" }, |
| 168 | |
| 169 | { Opt_backupuid, "backupuid=%s" }, |
| 170 | { Opt_backupgid, "backupgid=%s" }, |
| 171 | { Opt_uid, "uid=%s" }, |
| 172 | { Opt_cruid, "cruid=%s" }, |
| 173 | { Opt_gid, "gid=%s" }, |
| 174 | { Opt_file_mode, "file_mode=%s" }, |
| 175 | { Opt_dirmode, "dirmode=%s" }, |
| 176 | { Opt_dirmode, "dir_mode=%s" }, |
| 177 | { Opt_port, "port=%s" }, |
| 178 | { Opt_rsize, "rsize=%s" }, |
| 179 | { Opt_wsize, "wsize=%s" }, |
| 180 | { Opt_actimeo, "actimeo=%s" }, |
| 181 | |
| 182 | { Opt_blank_user, "user=" }, |
| 183 | { Opt_blank_user, "username=" }, |
| 184 | { Opt_user, "user=%s" }, |
| 185 | { Opt_user, "username=%s" }, |
| 186 | { Opt_blank_pass, "pass=" }, |
| 187 | { Opt_blank_pass, "password=" }, |
| 188 | { Opt_pass, "pass=%s" }, |
| 189 | { Opt_pass, "password=%s" }, |
| 190 | { Opt_blank_ip, "ip=" }, |
| 191 | { Opt_blank_ip, "addr=" }, |
| 192 | { Opt_ip, "ip=%s" }, |
| 193 | { Opt_ip, "addr=%s" }, |
| 194 | { Opt_ignore, "unc=%s" }, |
| 195 | { Opt_ignore, "target=%s" }, |
| 196 | { Opt_ignore, "path=%s" }, |
| 197 | { Opt_domain, "dom=%s" }, |
| 198 | { Opt_domain, "domain=%s" }, |
| 199 | { Opt_domain, "workgroup=%s" }, |
| 200 | { Opt_srcaddr, "srcaddr=%s" }, |
| 201 | { Opt_ignore, "prefixpath=%s" }, |
| 202 | { Opt_iocharset, "iocharset=%s" }, |
| 203 | { Opt_netbiosname, "netbiosname=%s" }, |
| 204 | { Opt_servern, "servern=%s" }, |
| 205 | { Opt_ver, "ver=%s" }, |
| 206 | { Opt_vers, "vers=%s" }, |
| 207 | { Opt_sec, "sec=%s" }, |
| 208 | { Opt_cache, "cache=%s" }, |
| 209 | |
| 210 | { Opt_ignore, "cred" }, |
| 211 | { Opt_ignore, "credentials" }, |
| 212 | { Opt_ignore, "cred=%s" }, |
| 213 | { Opt_ignore, "credentials=%s" }, |
| 214 | { Opt_ignore, "guest" }, |
| 215 | { Opt_ignore, "rw" }, |
| 216 | { Opt_ignore, "ro" }, |
| 217 | { Opt_ignore, "suid" }, |
| 218 | { Opt_ignore, "nosuid" }, |
| 219 | { Opt_ignore, "exec" }, |
| 220 | { Opt_ignore, "noexec" }, |
| 221 | { Opt_ignore, "nodev" }, |
| 222 | { Opt_ignore, "noauto" }, |
| 223 | { Opt_ignore, "dev" }, |
| 224 | { Opt_ignore, "mand" }, |
| 225 | { Opt_ignore, "nomand" }, |
| 226 | { Opt_ignore, "_netdev" }, |
| 227 | |
| 228 | { Opt_err, NULL } |
| 229 | }; |
| 230 | |
| 231 | enum { |
| 232 | Opt_sec_krb5, Opt_sec_krb5i, Opt_sec_krb5p, |
| 233 | Opt_sec_ntlmsspi, Opt_sec_ntlmssp, |
| 234 | Opt_ntlm, Opt_sec_ntlmi, Opt_sec_ntlmv2, |
| 235 | Opt_sec_ntlmv2i, Opt_sec_lanman, |
| 236 | Opt_sec_none, |
| 237 | |
| 238 | Opt_sec_err |
| 239 | }; |
| 240 | |
| 241 | static const match_table_t cifs_secflavor_tokens = { |
| 242 | { Opt_sec_krb5, "krb5" }, |
| 243 | { Opt_sec_krb5i, "krb5i" }, |
| 244 | { Opt_sec_krb5p, "krb5p" }, |
| 245 | { Opt_sec_ntlmsspi, "ntlmsspi" }, |
| 246 | { Opt_sec_ntlmssp, "ntlmssp" }, |
| 247 | { Opt_ntlm, "ntlm" }, |
| 248 | { Opt_sec_ntlmi, "ntlmi" }, |
| 249 | { Opt_sec_ntlmv2, "nontlm" }, |
| 250 | { Opt_sec_ntlmv2, "ntlmv2" }, |
| 251 | { Opt_sec_ntlmv2i, "ntlmv2i" }, |
| 252 | { Opt_sec_lanman, "lanman" }, |
| 253 | { Opt_sec_none, "none" }, |
| 254 | |
| 255 | { Opt_sec_err, NULL } |
| 256 | }; |
| 257 | |
| 258 | /* cache flavors */ |
| 259 | enum { |
| 260 | Opt_cache_loose, |
| 261 | Opt_cache_strict, |
| 262 | Opt_cache_none, |
| 263 | Opt_cache_err |
| 264 | }; |
| 265 | |
| 266 | static const match_table_t cifs_cacheflavor_tokens = { |
| 267 | { Opt_cache_loose, "loose" }, |
| 268 | { Opt_cache_strict, "strict" }, |
| 269 | { Opt_cache_none, "none" }, |
| 270 | { Opt_cache_err, NULL } |
| 271 | }; |
| 272 | |
| 273 | static const match_table_t cifs_smb_version_tokens = { |
| 274 | { Smb_1, SMB1_VERSION_STRING }, |
| 275 | { Smb_20, SMB20_VERSION_STRING}, |
| 276 | { Smb_21, SMB21_VERSION_STRING }, |
| 277 | { Smb_30, SMB30_VERSION_STRING }, |
| 278 | }; |
| 279 | |
| 280 | static int ip_connect(struct TCP_Server_Info *server); |
| 281 | static int generic_ip_connect(struct TCP_Server_Info *server); |
| 282 | static void tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink); |
| 283 | static void cifs_prune_tlinks(struct work_struct *work); |
| 284 | static int cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data, |
| 285 | const char *devname); |
| 286 | |
| 287 | /* |
| 288 | * cifs tcp session reconnection |
| 289 | * |
| 290 | * mark tcp session as reconnecting so temporarily locked |
| 291 | * mark all smb sessions as reconnecting for tcp session |
| 292 | * reconnect tcp session |
| 293 | * wake up waiters on reconnection? - (not needed currently) |
| 294 | */ |
| 295 | int |
| 296 | cifs_reconnect(struct TCP_Server_Info *server) |
| 297 | { |
| 298 | int rc = 0; |
| 299 | struct list_head *tmp, *tmp2; |
| 300 | struct cifs_ses *ses; |
| 301 | struct cifs_tcon *tcon; |
| 302 | struct mid_q_entry *mid_entry; |
| 303 | struct list_head retry_list; |
| 304 | |
| 305 | spin_lock(&GlobalMid_Lock); |
| 306 | if (server->tcpStatus == CifsExiting) { |
| 307 | /* the demux thread will exit normally |
| 308 | next time through the loop */ |
| 309 | spin_unlock(&GlobalMid_Lock); |
| 310 | return rc; |
| 311 | } else |
| 312 | server->tcpStatus = CifsNeedReconnect; |
| 313 | spin_unlock(&GlobalMid_Lock); |
| 314 | server->maxBuf = 0; |
| 315 | #ifdef CONFIG_CIFS_SMB2 |
| 316 | server->max_read = 0; |
| 317 | #endif |
| 318 | |
| 319 | cifs_dbg(FYI, "Reconnecting tcp session\n"); |
| 320 | |
| 321 | /* before reconnecting the tcp session, mark the smb session (uid) |
| 322 | and the tid bad so they are not used until reconnected */ |
| 323 | cifs_dbg(FYI, "%s: marking sessions and tcons for reconnect\n", |
| 324 | __func__); |
| 325 | spin_lock(&cifs_tcp_ses_lock); |
| 326 | list_for_each(tmp, &server->smb_ses_list) { |
| 327 | ses = list_entry(tmp, struct cifs_ses, smb_ses_list); |
| 328 | ses->need_reconnect = true; |
| 329 | ses->ipc_tid = 0; |
| 330 | list_for_each(tmp2, &ses->tcon_list) { |
| 331 | tcon = list_entry(tmp2, struct cifs_tcon, tcon_list); |
| 332 | tcon->need_reconnect = true; |
| 333 | } |
| 334 | } |
| 335 | spin_unlock(&cifs_tcp_ses_lock); |
| 336 | |
| 337 | /* do not want to be sending data on a socket we are freeing */ |
| 338 | cifs_dbg(FYI, "%s: tearing down socket\n", __func__); |
| 339 | mutex_lock(&server->srv_mutex); |
| 340 | if (server->ssocket) { |
| 341 | cifs_dbg(FYI, "State: 0x%x Flags: 0x%lx\n", |
| 342 | server->ssocket->state, server->ssocket->flags); |
| 343 | kernel_sock_shutdown(server->ssocket, SHUT_WR); |
| 344 | cifs_dbg(FYI, "Post shutdown state: 0x%x Flags: 0x%lx\n", |
| 345 | server->ssocket->state, server->ssocket->flags); |
| 346 | sock_release(server->ssocket); |
| 347 | server->ssocket = NULL; |
| 348 | } |
| 349 | server->sequence_number = 0; |
| 350 | server->session_estab = false; |
| 351 | kfree(server->session_key.response); |
| 352 | server->session_key.response = NULL; |
| 353 | server->session_key.len = 0; |
| 354 | server->lstrp = jiffies; |
| 355 | mutex_unlock(&server->srv_mutex); |
| 356 | |
| 357 | /* mark submitted MIDs for retry and issue callback */ |
| 358 | INIT_LIST_HEAD(&retry_list); |
| 359 | cifs_dbg(FYI, "%s: moving mids to private list\n", __func__); |
| 360 | spin_lock(&GlobalMid_Lock); |
| 361 | list_for_each_safe(tmp, tmp2, &server->pending_mid_q) { |
| 362 | mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| 363 | if (mid_entry->mid_state == MID_REQUEST_SUBMITTED) |
| 364 | mid_entry->mid_state = MID_RETRY_NEEDED; |
| 365 | list_move(&mid_entry->qhead, &retry_list); |
| 366 | } |
| 367 | spin_unlock(&GlobalMid_Lock); |
| 368 | |
| 369 | cifs_dbg(FYI, "%s: issuing mid callbacks\n", __func__); |
| 370 | list_for_each_safe(tmp, tmp2, &retry_list) { |
| 371 | mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| 372 | list_del_init(&mid_entry->qhead); |
| 373 | mid_entry->callback(mid_entry); |
| 374 | } |
| 375 | |
| 376 | do { |
| 377 | try_to_freeze(); |
| 378 | |
| 379 | /* we should try only the port we connected to before */ |
| 380 | rc = generic_ip_connect(server); |
| 381 | if (rc) { |
| 382 | cifs_dbg(FYI, "reconnect error %d\n", rc); |
| 383 | msleep(3000); |
| 384 | } else { |
| 385 | atomic_inc(&tcpSesReconnectCount); |
| 386 | spin_lock(&GlobalMid_Lock); |
| 387 | if (server->tcpStatus != CifsExiting) |
| 388 | server->tcpStatus = CifsNeedNegotiate; |
| 389 | spin_unlock(&GlobalMid_Lock); |
| 390 | } |
| 391 | } while (server->tcpStatus == CifsNeedReconnect); |
| 392 | |
| 393 | return rc; |
| 394 | } |
| 395 | |
| 396 | static void |
| 397 | cifs_echo_request(struct work_struct *work) |
| 398 | { |
| 399 | int rc; |
| 400 | struct TCP_Server_Info *server = container_of(work, |
| 401 | struct TCP_Server_Info, echo.work); |
| 402 | |
| 403 | /* |
| 404 | * We cannot send an echo if it is disabled or until the |
| 405 | * NEGOTIATE_PROTOCOL request is done, which is indicated by |
| 406 | * server->ops->need_neg() == true. Also, no need to ping if |
| 407 | * we got a response recently. |
| 408 | */ |
| 409 | if (!server->ops->need_neg || server->ops->need_neg(server) || |
| 410 | (server->ops->can_echo && !server->ops->can_echo(server)) || |
| 411 | time_before(jiffies, server->lstrp + SMB_ECHO_INTERVAL - HZ)) |
| 412 | goto requeue_echo; |
| 413 | |
| 414 | rc = server->ops->echo ? server->ops->echo(server) : -ENOSYS; |
| 415 | if (rc) |
| 416 | cifs_dbg(FYI, "Unable to send echo request to server: %s\n", |
| 417 | server->hostname); |
| 418 | |
| 419 | requeue_echo: |
| 420 | queue_delayed_work(cifsiod_wq, &server->echo, SMB_ECHO_INTERVAL); |
| 421 | } |
| 422 | |
| 423 | static bool |
| 424 | allocate_buffers(struct TCP_Server_Info *server) |
| 425 | { |
| 426 | if (!server->bigbuf) { |
| 427 | server->bigbuf = (char *)cifs_buf_get(); |
| 428 | if (!server->bigbuf) { |
| 429 | cifs_dbg(VFS, "No memory for large SMB response\n"); |
| 430 | msleep(3000); |
| 431 | /* retry will check if exiting */ |
| 432 | return false; |
| 433 | } |
| 434 | } else if (server->large_buf) { |
| 435 | /* we are reusing a dirty large buf, clear its start */ |
| 436 | memset(server->bigbuf, 0, HEADER_SIZE(server)); |
| 437 | } |
| 438 | |
| 439 | if (!server->smallbuf) { |
| 440 | server->smallbuf = (char *)cifs_small_buf_get(); |
| 441 | if (!server->smallbuf) { |
| 442 | cifs_dbg(VFS, "No memory for SMB response\n"); |
| 443 | msleep(1000); |
| 444 | /* retry will check if exiting */ |
| 445 | return false; |
| 446 | } |
| 447 | /* beginning of smb buffer is cleared in our buf_get */ |
| 448 | } else { |
| 449 | /* if existing small buf clear beginning */ |
| 450 | memset(server->smallbuf, 0, HEADER_SIZE(server)); |
| 451 | } |
| 452 | |
| 453 | return true; |
| 454 | } |
| 455 | |
| 456 | static bool |
| 457 | server_unresponsive(struct TCP_Server_Info *server) |
| 458 | { |
| 459 | /* |
| 460 | * We need to wait 2 echo intervals to make sure we handle such |
| 461 | * situations right: |
| 462 | * 1s client sends a normal SMB request |
| 463 | * 2s client gets a response |
| 464 | * 30s echo workqueue job pops, and decides we got a response recently |
| 465 | * and don't need to send another |
| 466 | * ... |
| 467 | * 65s kernel_recvmsg times out, and we see that we haven't gotten |
| 468 | * a response in >60s. |
| 469 | */ |
| 470 | if (server->tcpStatus == CifsGood && |
| 471 | time_after(jiffies, server->lstrp + 2 * SMB_ECHO_INTERVAL)) { |
| 472 | cifs_dbg(VFS, "Server %s has not responded in %d seconds. Reconnecting...\n", |
| 473 | server->hostname, (2 * SMB_ECHO_INTERVAL) / HZ); |
| 474 | cifs_reconnect(server); |
| 475 | wake_up(&server->response_q); |
| 476 | return true; |
| 477 | } |
| 478 | |
| 479 | return false; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * kvec_array_init - clone a kvec array, and advance into it |
| 484 | * @new: pointer to memory for cloned array |
| 485 | * @iov: pointer to original array |
| 486 | * @nr_segs: number of members in original array |
| 487 | * @bytes: number of bytes to advance into the cloned array |
| 488 | * |
| 489 | * This function will copy the array provided in iov to a section of memory |
| 490 | * and advance the specified number of bytes into the new array. It returns |
| 491 | * the number of segments in the new array. "new" must be at least as big as |
| 492 | * the original iov array. |
| 493 | */ |
| 494 | static unsigned int |
| 495 | kvec_array_init(struct kvec *new, struct kvec *iov, unsigned int nr_segs, |
| 496 | size_t bytes) |
| 497 | { |
| 498 | size_t base = 0; |
| 499 | |
| 500 | while (bytes || !iov->iov_len) { |
| 501 | int copy = min(bytes, iov->iov_len); |
| 502 | |
| 503 | bytes -= copy; |
| 504 | base += copy; |
| 505 | if (iov->iov_len == base) { |
| 506 | iov++; |
| 507 | nr_segs--; |
| 508 | base = 0; |
| 509 | } |
| 510 | } |
| 511 | memcpy(new, iov, sizeof(*iov) * nr_segs); |
| 512 | new->iov_base += base; |
| 513 | new->iov_len -= base; |
| 514 | return nr_segs; |
| 515 | } |
| 516 | |
| 517 | static struct kvec * |
| 518 | get_server_iovec(struct TCP_Server_Info *server, unsigned int nr_segs) |
| 519 | { |
| 520 | struct kvec *new_iov; |
| 521 | |
| 522 | if (server->iov && nr_segs <= server->nr_iov) |
| 523 | return server->iov; |
| 524 | |
| 525 | /* not big enough -- allocate a new one and release the old */ |
| 526 | new_iov = kmalloc(sizeof(*new_iov) * nr_segs, GFP_NOFS); |
| 527 | if (new_iov) { |
| 528 | kfree(server->iov); |
| 529 | server->iov = new_iov; |
| 530 | server->nr_iov = nr_segs; |
| 531 | } |
| 532 | return new_iov; |
| 533 | } |
| 534 | |
| 535 | int |
| 536 | cifs_readv_from_socket(struct TCP_Server_Info *server, struct kvec *iov_orig, |
| 537 | unsigned int nr_segs, unsigned int to_read) |
| 538 | { |
| 539 | int length = 0; |
| 540 | int total_read; |
| 541 | unsigned int segs; |
| 542 | struct msghdr smb_msg; |
| 543 | struct kvec *iov; |
| 544 | |
| 545 | iov = get_server_iovec(server, nr_segs); |
| 546 | if (!iov) |
| 547 | return -ENOMEM; |
| 548 | |
| 549 | smb_msg.msg_control = NULL; |
| 550 | smb_msg.msg_controllen = 0; |
| 551 | |
| 552 | for (total_read = 0; to_read; total_read += length, to_read -= length) { |
| 553 | try_to_freeze(); |
| 554 | |
| 555 | if (server_unresponsive(server)) { |
| 556 | total_read = -EAGAIN; |
| 557 | break; |
| 558 | } |
| 559 | |
| 560 | segs = kvec_array_init(iov, iov_orig, nr_segs, total_read); |
| 561 | |
| 562 | length = kernel_recvmsg(server->ssocket, &smb_msg, |
| 563 | iov, segs, to_read, 0); |
| 564 | |
| 565 | if (server->tcpStatus == CifsExiting) { |
| 566 | total_read = -ESHUTDOWN; |
| 567 | break; |
| 568 | } else if (server->tcpStatus == CifsNeedReconnect) { |
| 569 | cifs_reconnect(server); |
| 570 | total_read = -EAGAIN; |
| 571 | break; |
| 572 | } else if (length == -ERESTARTSYS || |
| 573 | length == -EAGAIN || |
| 574 | length == -EINTR) { |
| 575 | /* |
| 576 | * Minimum sleep to prevent looping, allowing socket |
| 577 | * to clear and app threads to set tcpStatus |
| 578 | * CifsNeedReconnect if server hung. |
| 579 | */ |
| 580 | usleep_range(1000, 2000); |
| 581 | length = 0; |
| 582 | continue; |
| 583 | } else if (length <= 0) { |
| 584 | cifs_dbg(FYI, "Received no data or error: expecting %d\n" |
| 585 | "got %d", to_read, length); |
| 586 | cifs_reconnect(server); |
| 587 | total_read = -EAGAIN; |
| 588 | break; |
| 589 | } |
| 590 | } |
| 591 | return total_read; |
| 592 | } |
| 593 | |
| 594 | int |
| 595 | cifs_read_from_socket(struct TCP_Server_Info *server, char *buf, |
| 596 | unsigned int to_read) |
| 597 | { |
| 598 | struct kvec iov; |
| 599 | |
| 600 | iov.iov_base = buf; |
| 601 | iov.iov_len = to_read; |
| 602 | |
| 603 | return cifs_readv_from_socket(server, &iov, 1, to_read); |
| 604 | } |
| 605 | |
| 606 | static bool |
| 607 | is_smb_response(struct TCP_Server_Info *server, unsigned char type) |
| 608 | { |
| 609 | /* |
| 610 | * The first byte big endian of the length field, |
| 611 | * is actually not part of the length but the type |
| 612 | * with the most common, zero, as regular data. |
| 613 | */ |
| 614 | switch (type) { |
| 615 | case RFC1002_SESSION_MESSAGE: |
| 616 | /* Regular SMB response */ |
| 617 | return true; |
| 618 | case RFC1002_SESSION_KEEP_ALIVE: |
| 619 | cifs_dbg(FYI, "RFC 1002 session keep alive\n"); |
| 620 | break; |
| 621 | case RFC1002_POSITIVE_SESSION_RESPONSE: |
| 622 | cifs_dbg(FYI, "RFC 1002 positive session response\n"); |
| 623 | break; |
| 624 | case RFC1002_NEGATIVE_SESSION_RESPONSE: |
| 625 | /* |
| 626 | * We get this from Windows 98 instead of an error on |
| 627 | * SMB negprot response. |
| 628 | */ |
| 629 | cifs_dbg(FYI, "RFC 1002 negative session response\n"); |
| 630 | /* give server a second to clean up */ |
| 631 | msleep(1000); |
| 632 | /* |
| 633 | * Always try 445 first on reconnect since we get NACK |
| 634 | * on some if we ever connected to port 139 (the NACK |
| 635 | * is since we do not begin with RFC1001 session |
| 636 | * initialize frame). |
| 637 | */ |
| 638 | cifs_set_port((struct sockaddr *)&server->dstaddr, CIFS_PORT); |
| 639 | cifs_reconnect(server); |
| 640 | wake_up(&server->response_q); |
| 641 | break; |
| 642 | default: |
| 643 | cifs_dbg(VFS, "RFC 1002 unknown response type 0x%x\n", type); |
| 644 | cifs_reconnect(server); |
| 645 | } |
| 646 | |
| 647 | return false; |
| 648 | } |
| 649 | |
| 650 | void |
| 651 | dequeue_mid(struct mid_q_entry *mid, bool malformed) |
| 652 | { |
| 653 | #ifdef CONFIG_CIFS_STATS2 |
| 654 | mid->when_received = jiffies; |
| 655 | #endif |
| 656 | spin_lock(&GlobalMid_Lock); |
| 657 | if (!malformed) |
| 658 | mid->mid_state = MID_RESPONSE_RECEIVED; |
| 659 | else |
| 660 | mid->mid_state = MID_RESPONSE_MALFORMED; |
| 661 | list_del_init(&mid->qhead); |
| 662 | spin_unlock(&GlobalMid_Lock); |
| 663 | } |
| 664 | |
| 665 | static void |
| 666 | handle_mid(struct mid_q_entry *mid, struct TCP_Server_Info *server, |
| 667 | char *buf, int malformed) |
| 668 | { |
| 669 | if (server->ops->check_trans2 && |
| 670 | server->ops->check_trans2(mid, server, buf, malformed)) |
| 671 | return; |
| 672 | mid->resp_buf = buf; |
| 673 | mid->large_buf = server->large_buf; |
| 674 | /* Was previous buf put in mpx struct for multi-rsp? */ |
| 675 | if (!mid->multiRsp) { |
| 676 | /* smb buffer will be freed by user thread */ |
| 677 | if (server->large_buf) |
| 678 | server->bigbuf = NULL; |
| 679 | else |
| 680 | server->smallbuf = NULL; |
| 681 | } |
| 682 | dequeue_mid(mid, malformed); |
| 683 | } |
| 684 | |
| 685 | static void clean_demultiplex_info(struct TCP_Server_Info *server) |
| 686 | { |
| 687 | int length; |
| 688 | |
| 689 | /* take it off the list, if it's not already */ |
| 690 | spin_lock(&cifs_tcp_ses_lock); |
| 691 | list_del_init(&server->tcp_ses_list); |
| 692 | spin_unlock(&cifs_tcp_ses_lock); |
| 693 | |
| 694 | spin_lock(&GlobalMid_Lock); |
| 695 | server->tcpStatus = CifsExiting; |
| 696 | spin_unlock(&GlobalMid_Lock); |
| 697 | wake_up_all(&server->response_q); |
| 698 | |
| 699 | /* check if we have blocked requests that need to free */ |
| 700 | spin_lock(&server->req_lock); |
| 701 | if (server->credits <= 0) |
| 702 | server->credits = 1; |
| 703 | spin_unlock(&server->req_lock); |
| 704 | /* |
| 705 | * Although there should not be any requests blocked on this queue it |
| 706 | * can not hurt to be paranoid and try to wake up requests that may |
| 707 | * haven been blocked when more than 50 at time were on the wire to the |
| 708 | * same server - they now will see the session is in exit state and get |
| 709 | * out of SendReceive. |
| 710 | */ |
| 711 | wake_up_all(&server->request_q); |
| 712 | /* give those requests time to exit */ |
| 713 | msleep(125); |
| 714 | |
| 715 | if (server->ssocket) { |
| 716 | sock_release(server->ssocket); |
| 717 | server->ssocket = NULL; |
| 718 | } |
| 719 | |
| 720 | if (!list_empty(&server->pending_mid_q)) { |
| 721 | struct list_head dispose_list; |
| 722 | struct mid_q_entry *mid_entry; |
| 723 | struct list_head *tmp, *tmp2; |
| 724 | |
| 725 | INIT_LIST_HEAD(&dispose_list); |
| 726 | spin_lock(&GlobalMid_Lock); |
| 727 | list_for_each_safe(tmp, tmp2, &server->pending_mid_q) { |
| 728 | mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| 729 | cifs_dbg(FYI, "Clearing mid 0x%llx\n", mid_entry->mid); |
| 730 | mid_entry->mid_state = MID_SHUTDOWN; |
| 731 | list_move(&mid_entry->qhead, &dispose_list); |
| 732 | } |
| 733 | spin_unlock(&GlobalMid_Lock); |
| 734 | |
| 735 | /* now walk dispose list and issue callbacks */ |
| 736 | list_for_each_safe(tmp, tmp2, &dispose_list) { |
| 737 | mid_entry = list_entry(tmp, struct mid_q_entry, qhead); |
| 738 | cifs_dbg(FYI, "Callback mid 0x%llx\n", mid_entry->mid); |
| 739 | list_del_init(&mid_entry->qhead); |
| 740 | mid_entry->callback(mid_entry); |
| 741 | } |
| 742 | /* 1/8th of sec is more than enough time for them to exit */ |
| 743 | msleep(125); |
| 744 | } |
| 745 | |
| 746 | if (!list_empty(&server->pending_mid_q)) { |
| 747 | /* |
| 748 | * mpx threads have not exited yet give them at least the smb |
| 749 | * send timeout time for long ops. |
| 750 | * |
| 751 | * Due to delays on oplock break requests, we need to wait at |
| 752 | * least 45 seconds before giving up on a request getting a |
| 753 | * response and going ahead and killing cifsd. |
| 754 | */ |
| 755 | cifs_dbg(FYI, "Wait for exit from demultiplex thread\n"); |
| 756 | msleep(46000); |
| 757 | /* |
| 758 | * If threads still have not exited they are probably never |
| 759 | * coming home not much else we can do but free the memory. |
| 760 | */ |
| 761 | } |
| 762 | |
| 763 | kfree(server->hostname); |
| 764 | kfree(server->iov); |
| 765 | kfree(server); |
| 766 | |
| 767 | length = atomic_dec_return(&tcpSesAllocCount); |
| 768 | if (length > 0) |
| 769 | mempool_resize(cifs_req_poolp, length + cifs_min_rcv, |
| 770 | GFP_KERNEL); |
| 771 | } |
| 772 | |
| 773 | static int |
| 774 | standard_receive3(struct TCP_Server_Info *server, struct mid_q_entry *mid) |
| 775 | { |
| 776 | int length; |
| 777 | char *buf = server->smallbuf; |
| 778 | unsigned int pdu_length = get_rfc1002_length(buf); |
| 779 | |
| 780 | /* make sure this will fit in a large buffer */ |
| 781 | if (pdu_length > CIFSMaxBufSize + MAX_HEADER_SIZE(server) - 4) { |
| 782 | cifs_dbg(VFS, "SMB response too long (%u bytes)\n", pdu_length); |
| 783 | cifs_reconnect(server); |
| 784 | wake_up(&server->response_q); |
| 785 | return -EAGAIN; |
| 786 | } |
| 787 | |
| 788 | /* switch to large buffer if too big for a small one */ |
| 789 | if (pdu_length > MAX_CIFS_SMALL_BUFFER_SIZE - 4) { |
| 790 | server->large_buf = true; |
| 791 | memcpy(server->bigbuf, buf, server->total_read); |
| 792 | buf = server->bigbuf; |
| 793 | } |
| 794 | |
| 795 | /* now read the rest */ |
| 796 | length = cifs_read_from_socket(server, buf + HEADER_SIZE(server) - 1, |
| 797 | pdu_length - HEADER_SIZE(server) + 1 + 4); |
| 798 | if (length < 0) |
| 799 | return length; |
| 800 | server->total_read += length; |
| 801 | |
| 802 | dump_smb(buf, server->total_read); |
| 803 | |
| 804 | /* |
| 805 | * We know that we received enough to get to the MID as we |
| 806 | * checked the pdu_length earlier. Now check to see |
| 807 | * if the rest of the header is OK. We borrow the length |
| 808 | * var for the rest of the loop to avoid a new stack var. |
| 809 | * |
| 810 | * 48 bytes is enough to display the header and a little bit |
| 811 | * into the payload for debugging purposes. |
| 812 | */ |
| 813 | length = server->ops->check_message(buf, server->total_read); |
| 814 | if (length != 0) |
| 815 | cifs_dump_mem("Bad SMB: ", buf, |
| 816 | min_t(unsigned int, server->total_read, 48)); |
| 817 | |
| 818 | if (server->ops->is_status_pending && |
| 819 | server->ops->is_status_pending(buf, server, length)) |
| 820 | return -1; |
| 821 | |
| 822 | if (!mid) |
| 823 | return length; |
| 824 | |
| 825 | handle_mid(mid, server, buf, length); |
| 826 | return 0; |
| 827 | } |
| 828 | |
| 829 | static int |
| 830 | cifs_demultiplex_thread(void *p) |
| 831 | { |
| 832 | int length; |
| 833 | struct TCP_Server_Info *server = p; |
| 834 | unsigned int pdu_length; |
| 835 | char *buf = NULL; |
| 836 | struct task_struct *task_to_wake = NULL; |
| 837 | struct mid_q_entry *mid_entry; |
| 838 | |
| 839 | current->flags |= PF_MEMALLOC; |
| 840 | cifs_dbg(FYI, "Demultiplex PID: %d\n", task_pid_nr(current)); |
| 841 | |
| 842 | length = atomic_inc_return(&tcpSesAllocCount); |
| 843 | if (length > 1) |
| 844 | mempool_resize(cifs_req_poolp, length + cifs_min_rcv, |
| 845 | GFP_KERNEL); |
| 846 | |
| 847 | set_freezable(); |
| 848 | while (server->tcpStatus != CifsExiting) { |
| 849 | if (try_to_freeze()) |
| 850 | continue; |
| 851 | |
| 852 | if (!allocate_buffers(server)) |
| 853 | continue; |
| 854 | |
| 855 | server->large_buf = false; |
| 856 | buf = server->smallbuf; |
| 857 | pdu_length = 4; /* enough to get RFC1001 header */ |
| 858 | |
| 859 | length = cifs_read_from_socket(server, buf, pdu_length); |
| 860 | if (length < 0) |
| 861 | continue; |
| 862 | server->total_read = length; |
| 863 | |
| 864 | /* |
| 865 | * The right amount was read from socket - 4 bytes, |
| 866 | * so we can now interpret the length field. |
| 867 | */ |
| 868 | pdu_length = get_rfc1002_length(buf); |
| 869 | |
| 870 | cifs_dbg(FYI, "RFC1002 header 0x%x\n", pdu_length); |
| 871 | if (!is_smb_response(server, buf[0])) |
| 872 | continue; |
| 873 | |
| 874 | /* make sure we have enough to get to the MID */ |
| 875 | if (pdu_length < HEADER_SIZE(server) - 1 - 4) { |
| 876 | cifs_dbg(VFS, "SMB response too short (%u bytes)\n", |
| 877 | pdu_length); |
| 878 | cifs_reconnect(server); |
| 879 | wake_up(&server->response_q); |
| 880 | continue; |
| 881 | } |
| 882 | |
| 883 | /* read down to the MID */ |
| 884 | length = cifs_read_from_socket(server, buf + 4, |
| 885 | HEADER_SIZE(server) - 1 - 4); |
| 886 | if (length < 0) |
| 887 | continue; |
| 888 | server->total_read += length; |
| 889 | |
| 890 | mid_entry = server->ops->find_mid(server, buf); |
| 891 | |
| 892 | if (!mid_entry || !mid_entry->receive) |
| 893 | length = standard_receive3(server, mid_entry); |
| 894 | else |
| 895 | length = mid_entry->receive(server, mid_entry); |
| 896 | |
| 897 | if (length < 0) |
| 898 | continue; |
| 899 | |
| 900 | if (server->large_buf) |
| 901 | buf = server->bigbuf; |
| 902 | |
| 903 | server->lstrp = jiffies; |
| 904 | if (mid_entry != NULL) { |
| 905 | if (!mid_entry->multiRsp || mid_entry->multiEnd) |
| 906 | mid_entry->callback(mid_entry); |
| 907 | } else if (!server->ops->is_oplock_break || |
| 908 | !server->ops->is_oplock_break(buf, server)) { |
| 909 | cifs_dbg(VFS, "No task to wake, unknown frame received! NumMids %d\n", |
| 910 | atomic_read(&midCount)); |
| 911 | cifs_dump_mem("Received Data is: ", buf, |
| 912 | HEADER_SIZE(server)); |
| 913 | #ifdef CONFIG_CIFS_DEBUG2 |
| 914 | if (server->ops->dump_detail) |
| 915 | server->ops->dump_detail(buf); |
| 916 | cifs_dump_mids(server); |
| 917 | #endif /* CIFS_DEBUG2 */ |
| 918 | |
| 919 | } |
| 920 | } /* end while !EXITING */ |
| 921 | |
| 922 | /* buffer usually freed in free_mid - need to free it here on exit */ |
| 923 | cifs_buf_release(server->bigbuf); |
| 924 | if (server->smallbuf) /* no sense logging a debug message if NULL */ |
| 925 | cifs_small_buf_release(server->smallbuf); |
| 926 | |
| 927 | task_to_wake = xchg(&server->tsk, NULL); |
| 928 | clean_demultiplex_info(server); |
| 929 | |
| 930 | /* if server->tsk was NULL then wait for a signal before exiting */ |
| 931 | if (!task_to_wake) { |
| 932 | set_current_state(TASK_INTERRUPTIBLE); |
| 933 | while (!signal_pending(current)) { |
| 934 | schedule(); |
| 935 | set_current_state(TASK_INTERRUPTIBLE); |
| 936 | } |
| 937 | set_current_state(TASK_RUNNING); |
| 938 | } |
| 939 | |
| 940 | module_put_and_exit(0); |
| 941 | } |
| 942 | |
| 943 | /* extract the host portion of the UNC string */ |
| 944 | static char * |
| 945 | extract_hostname(const char *unc) |
| 946 | { |
| 947 | const char *src; |
| 948 | char *dst, *delim; |
| 949 | unsigned int len; |
| 950 | |
| 951 | /* skip double chars at beginning of string */ |
| 952 | /* BB: check validity of these bytes? */ |
| 953 | src = unc + 2; |
| 954 | |
| 955 | /* delimiter between hostname and sharename is always '\\' now */ |
| 956 | delim = strchr(src, '\\'); |
| 957 | if (!delim) |
| 958 | return ERR_PTR(-EINVAL); |
| 959 | |
| 960 | len = delim - src; |
| 961 | dst = kmalloc((len + 1), GFP_KERNEL); |
| 962 | if (dst == NULL) |
| 963 | return ERR_PTR(-ENOMEM); |
| 964 | |
| 965 | memcpy(dst, src, len); |
| 966 | dst[len] = '\0'; |
| 967 | |
| 968 | return dst; |
| 969 | } |
| 970 | |
| 971 | static int get_option_ul(substring_t args[], unsigned long *option) |
| 972 | { |
| 973 | int rc; |
| 974 | char *string; |
| 975 | |
| 976 | string = match_strdup(args); |
| 977 | if (string == NULL) |
| 978 | return -ENOMEM; |
| 979 | rc = kstrtoul(string, 0, option); |
| 980 | kfree(string); |
| 981 | |
| 982 | return rc; |
| 983 | } |
| 984 | |
| 985 | static int get_option_uid(substring_t args[], kuid_t *result) |
| 986 | { |
| 987 | unsigned long value; |
| 988 | kuid_t uid; |
| 989 | int rc; |
| 990 | |
| 991 | rc = get_option_ul(args, &value); |
| 992 | if (rc) |
| 993 | return rc; |
| 994 | |
| 995 | uid = make_kuid(current_user_ns(), value); |
| 996 | if (!uid_valid(uid)) |
| 997 | return -EINVAL; |
| 998 | |
| 999 | *result = uid; |
| 1000 | return 0; |
| 1001 | } |
| 1002 | |
| 1003 | static int get_option_gid(substring_t args[], kgid_t *result) |
| 1004 | { |
| 1005 | unsigned long value; |
| 1006 | kgid_t gid; |
| 1007 | int rc; |
| 1008 | |
| 1009 | rc = get_option_ul(args, &value); |
| 1010 | if (rc) |
| 1011 | return rc; |
| 1012 | |
| 1013 | gid = make_kgid(current_user_ns(), value); |
| 1014 | if (!gid_valid(gid)) |
| 1015 | return -EINVAL; |
| 1016 | |
| 1017 | *result = gid; |
| 1018 | return 0; |
| 1019 | } |
| 1020 | |
| 1021 | static int cifs_parse_security_flavors(char *value, |
| 1022 | struct smb_vol *vol) |
| 1023 | { |
| 1024 | |
| 1025 | substring_t args[MAX_OPT_ARGS]; |
| 1026 | |
| 1027 | switch (match_token(value, cifs_secflavor_tokens, args)) { |
| 1028 | case Opt_sec_krb5: |
| 1029 | vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MAY_SIGN; |
| 1030 | break; |
| 1031 | case Opt_sec_krb5i: |
| 1032 | vol->secFlg |= CIFSSEC_MAY_KRB5 | CIFSSEC_MUST_SIGN; |
| 1033 | break; |
| 1034 | case Opt_sec_krb5p: |
| 1035 | /* vol->secFlg |= CIFSSEC_MUST_SEAL | CIFSSEC_MAY_KRB5; */ |
| 1036 | cifs_dbg(VFS, "Krb5 cifs privacy not supported\n"); |
| 1037 | break; |
| 1038 | case Opt_sec_ntlmssp: |
| 1039 | vol->secFlg |= CIFSSEC_MAY_NTLMSSP; |
| 1040 | break; |
| 1041 | case Opt_sec_ntlmsspi: |
| 1042 | vol->secFlg |= CIFSSEC_MAY_NTLMSSP | CIFSSEC_MUST_SIGN; |
| 1043 | break; |
| 1044 | case Opt_ntlm: |
| 1045 | /* ntlm is default so can be turned off too */ |
| 1046 | vol->secFlg |= CIFSSEC_MAY_NTLM; |
| 1047 | break; |
| 1048 | case Opt_sec_ntlmi: |
| 1049 | vol->secFlg |= CIFSSEC_MAY_NTLM | CIFSSEC_MUST_SIGN; |
| 1050 | break; |
| 1051 | case Opt_sec_ntlmv2: |
| 1052 | vol->secFlg |= CIFSSEC_MAY_NTLMV2; |
| 1053 | break; |
| 1054 | case Opt_sec_ntlmv2i: |
| 1055 | vol->secFlg |= CIFSSEC_MAY_NTLMV2 | CIFSSEC_MUST_SIGN; |
| 1056 | break; |
| 1057 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| 1058 | case Opt_sec_lanman: |
| 1059 | vol->secFlg |= CIFSSEC_MAY_LANMAN; |
| 1060 | break; |
| 1061 | #endif |
| 1062 | case Opt_sec_none: |
| 1063 | vol->nullauth = 1; |
| 1064 | break; |
| 1065 | default: |
| 1066 | cifs_dbg(VFS, "bad security option: %s\n", value); |
| 1067 | return 1; |
| 1068 | } |
| 1069 | |
| 1070 | return 0; |
| 1071 | } |
| 1072 | |
| 1073 | static int |
| 1074 | cifs_parse_cache_flavor(char *value, struct smb_vol *vol) |
| 1075 | { |
| 1076 | substring_t args[MAX_OPT_ARGS]; |
| 1077 | |
| 1078 | switch (match_token(value, cifs_cacheflavor_tokens, args)) { |
| 1079 | case Opt_cache_loose: |
| 1080 | vol->direct_io = false; |
| 1081 | vol->strict_io = false; |
| 1082 | break; |
| 1083 | case Opt_cache_strict: |
| 1084 | vol->direct_io = false; |
| 1085 | vol->strict_io = true; |
| 1086 | break; |
| 1087 | case Opt_cache_none: |
| 1088 | vol->direct_io = true; |
| 1089 | vol->strict_io = false; |
| 1090 | break; |
| 1091 | default: |
| 1092 | cifs_dbg(VFS, "bad cache= option: %s\n", value); |
| 1093 | return 1; |
| 1094 | } |
| 1095 | return 0; |
| 1096 | } |
| 1097 | |
| 1098 | static int |
| 1099 | cifs_parse_smb_version(char *value, struct smb_vol *vol) |
| 1100 | { |
| 1101 | substring_t args[MAX_OPT_ARGS]; |
| 1102 | |
| 1103 | switch (match_token(value, cifs_smb_version_tokens, args)) { |
| 1104 | case Smb_1: |
| 1105 | vol->ops = &smb1_operations; |
| 1106 | vol->vals = &smb1_values; |
| 1107 | break; |
| 1108 | #ifdef CONFIG_CIFS_SMB2 |
| 1109 | case Smb_20: |
| 1110 | vol->ops = &smb21_operations; /* currently identical with 2.1 */ |
| 1111 | vol->vals = &smb20_values; |
| 1112 | break; |
| 1113 | case Smb_21: |
| 1114 | vol->ops = &smb21_operations; |
| 1115 | vol->vals = &smb21_values; |
| 1116 | break; |
| 1117 | case Smb_30: |
| 1118 | vol->ops = &smb30_operations; |
| 1119 | vol->vals = &smb30_values; |
| 1120 | break; |
| 1121 | #endif |
| 1122 | default: |
| 1123 | cifs_dbg(VFS, "Unknown vers= option specified: %s\n", value); |
| 1124 | return 1; |
| 1125 | } |
| 1126 | return 0; |
| 1127 | } |
| 1128 | |
| 1129 | /* |
| 1130 | * Parse a devname into substrings and populate the vol->UNC and vol->prepath |
| 1131 | * fields with the result. Returns 0 on success and an error otherwise. |
| 1132 | */ |
| 1133 | static int |
| 1134 | cifs_parse_devname(const char *devname, struct smb_vol *vol) |
| 1135 | { |
| 1136 | char *pos; |
| 1137 | const char *delims = "/\\"; |
| 1138 | size_t len; |
| 1139 | |
| 1140 | /* make sure we have a valid UNC double delimiter prefix */ |
| 1141 | len = strspn(devname, delims); |
| 1142 | if (len != 2) |
| 1143 | return -EINVAL; |
| 1144 | |
| 1145 | /* find delimiter between host and sharename */ |
| 1146 | pos = strpbrk(devname + 2, delims); |
| 1147 | if (!pos) |
| 1148 | return -EINVAL; |
| 1149 | |
| 1150 | /* skip past delimiter */ |
| 1151 | ++pos; |
| 1152 | |
| 1153 | /* now go until next delimiter or end of string */ |
| 1154 | len = strcspn(pos, delims); |
| 1155 | |
| 1156 | /* move "pos" up to delimiter or NULL */ |
| 1157 | pos += len; |
| 1158 | vol->UNC = kstrndup(devname, pos - devname, GFP_KERNEL); |
| 1159 | if (!vol->UNC) |
| 1160 | return -ENOMEM; |
| 1161 | |
| 1162 | convert_delimiter(vol->UNC, '\\'); |
| 1163 | |
| 1164 | /* If pos is NULL, or is a bogus trailing delimiter then no prepath */ |
| 1165 | if (!*pos++ || !*pos) |
| 1166 | return 0; |
| 1167 | |
| 1168 | vol->prepath = kstrdup(pos, GFP_KERNEL); |
| 1169 | if (!vol->prepath) |
| 1170 | return -ENOMEM; |
| 1171 | |
| 1172 | return 0; |
| 1173 | } |
| 1174 | |
| 1175 | static int |
| 1176 | cifs_parse_mount_options(const char *mountdata, const char *devname, |
| 1177 | struct smb_vol *vol) |
| 1178 | { |
| 1179 | char *data, *end; |
| 1180 | char *mountdata_copy = NULL, *options; |
| 1181 | unsigned int temp_len, i, j; |
| 1182 | char separator[2]; |
| 1183 | short int override_uid = -1; |
| 1184 | short int override_gid = -1; |
| 1185 | bool uid_specified = false; |
| 1186 | bool gid_specified = false; |
| 1187 | bool sloppy = false; |
| 1188 | char *invalid = NULL; |
| 1189 | char *nodename = utsname()->nodename; |
| 1190 | char *string = NULL; |
| 1191 | char *tmp_end, *value; |
| 1192 | char delim; |
| 1193 | bool got_ip = false; |
| 1194 | unsigned short port = 0; |
| 1195 | struct sockaddr *dstaddr = (struct sockaddr *)&vol->dstaddr; |
| 1196 | |
| 1197 | separator[0] = ','; |
| 1198 | separator[1] = 0; |
| 1199 | delim = separator[0]; |
| 1200 | |
| 1201 | /* ensure we always start with zeroed-out smb_vol */ |
| 1202 | memset(vol, 0, sizeof(*vol)); |
| 1203 | |
| 1204 | /* |
| 1205 | * does not have to be perfect mapping since field is |
| 1206 | * informational, only used for servers that do not support |
| 1207 | * port 445 and it can be overridden at mount time |
| 1208 | */ |
| 1209 | memset(vol->source_rfc1001_name, 0x20, RFC1001_NAME_LEN); |
| 1210 | for (i = 0; i < strnlen(nodename, RFC1001_NAME_LEN); i++) |
| 1211 | vol->source_rfc1001_name[i] = toupper(nodename[i]); |
| 1212 | |
| 1213 | vol->source_rfc1001_name[RFC1001_NAME_LEN] = 0; |
| 1214 | /* null target name indicates to use *SMBSERVR default called name |
| 1215 | if we end up sending RFC1001 session initialize */ |
| 1216 | vol->target_rfc1001_name[0] = 0; |
| 1217 | vol->cred_uid = current_uid(); |
| 1218 | vol->linux_uid = current_uid(); |
| 1219 | vol->linux_gid = current_gid(); |
| 1220 | |
| 1221 | /* default to only allowing write access to owner of the mount */ |
| 1222 | vol->dir_mode = vol->file_mode = S_IRUGO | S_IXUGO | S_IWUSR; |
| 1223 | |
| 1224 | /* vol->retry default is 0 (i.e. "soft" limited retry not hard retry) */ |
| 1225 | /* default is always to request posix paths. */ |
| 1226 | vol->posix_paths = 1; |
| 1227 | /* default to using server inode numbers where available */ |
| 1228 | vol->server_ino = 1; |
| 1229 | |
| 1230 | /* default is to use strict cifs caching semantics */ |
| 1231 | vol->strict_io = true; |
| 1232 | |
| 1233 | vol->actimeo = CIFS_DEF_ACTIMEO; |
| 1234 | |
| 1235 | /* FIXME: add autonegotiation -- for now, SMB1 is default */ |
| 1236 | vol->ops = &smb1_operations; |
| 1237 | vol->vals = &smb1_values; |
| 1238 | |
| 1239 | if (!mountdata) |
| 1240 | goto cifs_parse_mount_err; |
| 1241 | |
| 1242 | mountdata_copy = kstrndup(mountdata, PAGE_SIZE, GFP_KERNEL); |
| 1243 | if (!mountdata_copy) |
| 1244 | goto cifs_parse_mount_err; |
| 1245 | |
| 1246 | options = mountdata_copy; |
| 1247 | end = options + strlen(options); |
| 1248 | |
| 1249 | if (strncmp(options, "sep=", 4) == 0) { |
| 1250 | if (options[4] != 0) { |
| 1251 | separator[0] = options[4]; |
| 1252 | options += 5; |
| 1253 | } else { |
| 1254 | cifs_dbg(FYI, "Null separator not allowed\n"); |
| 1255 | } |
| 1256 | } |
| 1257 | vol->backupuid_specified = false; /* no backup intent for a user */ |
| 1258 | vol->backupgid_specified = false; /* no backup intent for a group */ |
| 1259 | |
| 1260 | /* |
| 1261 | * For now, we ignore -EINVAL errors under the assumption that the |
| 1262 | * unc= and prefixpath= options will be usable. |
| 1263 | */ |
| 1264 | if (cifs_parse_devname(devname, vol) == -ENOMEM) { |
| 1265 | printk(KERN_ERR "CIFS: Unable to allocate memory to parse " |
| 1266 | "device string.\n"); |
| 1267 | goto out_nomem; |
| 1268 | } |
| 1269 | |
| 1270 | while ((data = strsep(&options, separator)) != NULL) { |
| 1271 | substring_t args[MAX_OPT_ARGS]; |
| 1272 | unsigned long option; |
| 1273 | int token; |
| 1274 | |
| 1275 | if (!*data) |
| 1276 | continue; |
| 1277 | |
| 1278 | token = match_token(data, cifs_mount_option_tokens, args); |
| 1279 | |
| 1280 | switch (token) { |
| 1281 | |
| 1282 | /* Ingnore the following */ |
| 1283 | case Opt_ignore: |
| 1284 | break; |
| 1285 | |
| 1286 | /* Boolean values */ |
| 1287 | case Opt_user_xattr: |
| 1288 | vol->no_xattr = 0; |
| 1289 | break; |
| 1290 | case Opt_nouser_xattr: |
| 1291 | vol->no_xattr = 1; |
| 1292 | break; |
| 1293 | case Opt_forceuid: |
| 1294 | override_uid = 1; |
| 1295 | break; |
| 1296 | case Opt_noforceuid: |
| 1297 | override_uid = 0; |
| 1298 | break; |
| 1299 | case Opt_forcegid: |
| 1300 | override_gid = 1; |
| 1301 | break; |
| 1302 | case Opt_noforcegid: |
| 1303 | override_gid = 0; |
| 1304 | break; |
| 1305 | case Opt_noblocksend: |
| 1306 | vol->noblocksnd = 1; |
| 1307 | break; |
| 1308 | case Opt_noautotune: |
| 1309 | vol->noautotune = 1; |
| 1310 | break; |
| 1311 | case Opt_hard: |
| 1312 | vol->retry = 1; |
| 1313 | break; |
| 1314 | case Opt_soft: |
| 1315 | vol->retry = 0; |
| 1316 | break; |
| 1317 | case Opt_perm: |
| 1318 | vol->noperm = 0; |
| 1319 | break; |
| 1320 | case Opt_noperm: |
| 1321 | vol->noperm = 1; |
| 1322 | break; |
| 1323 | case Opt_mapchars: |
| 1324 | vol->remap = 1; |
| 1325 | break; |
| 1326 | case Opt_nomapchars: |
| 1327 | vol->remap = 0; |
| 1328 | break; |
| 1329 | case Opt_sfu: |
| 1330 | vol->sfu_emul = 1; |
| 1331 | break; |
| 1332 | case Opt_nosfu: |
| 1333 | vol->sfu_emul = 0; |
| 1334 | break; |
| 1335 | case Opt_nodfs: |
| 1336 | vol->nodfs = 1; |
| 1337 | break; |
| 1338 | case Opt_posixpaths: |
| 1339 | vol->posix_paths = 1; |
| 1340 | break; |
| 1341 | case Opt_noposixpaths: |
| 1342 | vol->posix_paths = 0; |
| 1343 | break; |
| 1344 | case Opt_nounix: |
| 1345 | vol->no_linux_ext = 1; |
| 1346 | break; |
| 1347 | case Opt_nocase: |
| 1348 | vol->nocase = 1; |
| 1349 | break; |
| 1350 | case Opt_brl: |
| 1351 | vol->nobrl = 0; |
| 1352 | break; |
| 1353 | case Opt_nobrl: |
| 1354 | vol->nobrl = 1; |
| 1355 | /* |
| 1356 | * turn off mandatory locking in mode |
| 1357 | * if remote locking is turned off since the |
| 1358 | * local vfs will do advisory |
| 1359 | */ |
| 1360 | if (vol->file_mode == |
| 1361 | (S_IALLUGO & ~(S_ISUID | S_IXGRP))) |
| 1362 | vol->file_mode = S_IALLUGO; |
| 1363 | break; |
| 1364 | case Opt_forcemandatorylock: |
| 1365 | vol->mand_lock = 1; |
| 1366 | break; |
| 1367 | case Opt_setuids: |
| 1368 | vol->setuids = 1; |
| 1369 | break; |
| 1370 | case Opt_nosetuids: |
| 1371 | vol->setuids = 0; |
| 1372 | break; |
| 1373 | case Opt_dynperm: |
| 1374 | vol->dynperm = true; |
| 1375 | break; |
| 1376 | case Opt_nodynperm: |
| 1377 | vol->dynperm = false; |
| 1378 | break; |
| 1379 | case Opt_nohard: |
| 1380 | vol->retry = 0; |
| 1381 | break; |
| 1382 | case Opt_nosoft: |
| 1383 | vol->retry = 1; |
| 1384 | break; |
| 1385 | case Opt_nointr: |
| 1386 | vol->intr = 0; |
| 1387 | break; |
| 1388 | case Opt_intr: |
| 1389 | vol->intr = 1; |
| 1390 | break; |
| 1391 | case Opt_nostrictsync: |
| 1392 | vol->nostrictsync = 1; |
| 1393 | break; |
| 1394 | case Opt_strictsync: |
| 1395 | vol->nostrictsync = 0; |
| 1396 | break; |
| 1397 | case Opt_serverino: |
| 1398 | vol->server_ino = 1; |
| 1399 | break; |
| 1400 | case Opt_noserverino: |
| 1401 | vol->server_ino = 0; |
| 1402 | break; |
| 1403 | case Opt_rwpidforward: |
| 1404 | vol->rwpidforward = 1; |
| 1405 | break; |
| 1406 | case Opt_cifsacl: |
| 1407 | vol->cifs_acl = 1; |
| 1408 | break; |
| 1409 | case Opt_nocifsacl: |
| 1410 | vol->cifs_acl = 0; |
| 1411 | break; |
| 1412 | case Opt_acl: |
| 1413 | vol->no_psx_acl = 0; |
| 1414 | break; |
| 1415 | case Opt_noacl: |
| 1416 | vol->no_psx_acl = 1; |
| 1417 | break; |
| 1418 | case Opt_locallease: |
| 1419 | vol->local_lease = 1; |
| 1420 | break; |
| 1421 | case Opt_sign: |
| 1422 | vol->secFlg |= CIFSSEC_MUST_SIGN; |
| 1423 | break; |
| 1424 | case Opt_seal: |
| 1425 | /* we do not do the following in secFlags because seal |
| 1426 | * is a per tree connection (mount) not a per socket |
| 1427 | * or per-smb connection option in the protocol |
| 1428 | * vol->secFlg |= CIFSSEC_MUST_SEAL; |
| 1429 | */ |
| 1430 | vol->seal = 1; |
| 1431 | break; |
| 1432 | case Opt_noac: |
| 1433 | printk(KERN_WARNING "CIFS: Mount option noac not " |
| 1434 | "supported. Instead set " |
| 1435 | "/proc/fs/cifs/LookupCacheEnabled to 0\n"); |
| 1436 | break; |
| 1437 | case Opt_fsc: |
| 1438 | #ifndef CONFIG_CIFS_FSCACHE |
| 1439 | cifs_dbg(VFS, "FS-Cache support needs CONFIG_CIFS_FSCACHE kernel config option set\n"); |
| 1440 | goto cifs_parse_mount_err; |
| 1441 | #endif |
| 1442 | vol->fsc = true; |
| 1443 | break; |
| 1444 | case Opt_mfsymlinks: |
| 1445 | vol->mfsymlinks = true; |
| 1446 | break; |
| 1447 | case Opt_multiuser: |
| 1448 | vol->multiuser = true; |
| 1449 | break; |
| 1450 | case Opt_sloppy: |
| 1451 | sloppy = true; |
| 1452 | break; |
| 1453 | |
| 1454 | /* Numeric Values */ |
| 1455 | case Opt_backupuid: |
| 1456 | if (get_option_uid(args, &vol->backupuid)) { |
| 1457 | cifs_dbg(VFS, "%s: Invalid backupuid value\n", |
| 1458 | __func__); |
| 1459 | goto cifs_parse_mount_err; |
| 1460 | } |
| 1461 | vol->backupuid_specified = true; |
| 1462 | break; |
| 1463 | case Opt_backupgid: |
| 1464 | if (get_option_gid(args, &vol->backupgid)) { |
| 1465 | cifs_dbg(VFS, "%s: Invalid backupgid value\n", |
| 1466 | __func__); |
| 1467 | goto cifs_parse_mount_err; |
| 1468 | } |
| 1469 | vol->backupgid_specified = true; |
| 1470 | break; |
| 1471 | case Opt_uid: |
| 1472 | if (get_option_uid(args, &vol->linux_uid)) { |
| 1473 | cifs_dbg(VFS, "%s: Invalid uid value\n", |
| 1474 | __func__); |
| 1475 | goto cifs_parse_mount_err; |
| 1476 | } |
| 1477 | uid_specified = true; |
| 1478 | break; |
| 1479 | case Opt_cruid: |
| 1480 | if (get_option_uid(args, &vol->cred_uid)) { |
| 1481 | cifs_dbg(VFS, "%s: Invalid cruid value\n", |
| 1482 | __func__); |
| 1483 | goto cifs_parse_mount_err; |
| 1484 | } |
| 1485 | break; |
| 1486 | case Opt_gid: |
| 1487 | if (get_option_gid(args, &vol->linux_gid)) { |
| 1488 | cifs_dbg(VFS, "%s: Invalid gid value\n", |
| 1489 | __func__); |
| 1490 | goto cifs_parse_mount_err; |
| 1491 | } |
| 1492 | gid_specified = true; |
| 1493 | break; |
| 1494 | case Opt_file_mode: |
| 1495 | if (get_option_ul(args, &option)) { |
| 1496 | cifs_dbg(VFS, "%s: Invalid file_mode value\n", |
| 1497 | __func__); |
| 1498 | goto cifs_parse_mount_err; |
| 1499 | } |
| 1500 | vol->file_mode = option; |
| 1501 | break; |
| 1502 | case Opt_dirmode: |
| 1503 | if (get_option_ul(args, &option)) { |
| 1504 | cifs_dbg(VFS, "%s: Invalid dir_mode value\n", |
| 1505 | __func__); |
| 1506 | goto cifs_parse_mount_err; |
| 1507 | } |
| 1508 | vol->dir_mode = option; |
| 1509 | break; |
| 1510 | case Opt_port: |
| 1511 | if (get_option_ul(args, &option) || |
| 1512 | option > USHRT_MAX) { |
| 1513 | cifs_dbg(VFS, "%s: Invalid port value\n", |
| 1514 | __func__); |
| 1515 | goto cifs_parse_mount_err; |
| 1516 | } |
| 1517 | port = (unsigned short)option; |
| 1518 | break; |
| 1519 | case Opt_rsize: |
| 1520 | if (get_option_ul(args, &option)) { |
| 1521 | cifs_dbg(VFS, "%s: Invalid rsize value\n", |
| 1522 | __func__); |
| 1523 | goto cifs_parse_mount_err; |
| 1524 | } |
| 1525 | vol->rsize = option; |
| 1526 | break; |
| 1527 | case Opt_wsize: |
| 1528 | if (get_option_ul(args, &option)) { |
| 1529 | cifs_dbg(VFS, "%s: Invalid wsize value\n", |
| 1530 | __func__); |
| 1531 | goto cifs_parse_mount_err; |
| 1532 | } |
| 1533 | vol->wsize = option; |
| 1534 | break; |
| 1535 | case Opt_actimeo: |
| 1536 | if (get_option_ul(args, &option)) { |
| 1537 | cifs_dbg(VFS, "%s: Invalid actimeo value\n", |
| 1538 | __func__); |
| 1539 | goto cifs_parse_mount_err; |
| 1540 | } |
| 1541 | vol->actimeo = HZ * option; |
| 1542 | if (vol->actimeo > CIFS_MAX_ACTIMEO) { |
| 1543 | cifs_dbg(VFS, "attribute cache timeout too large\n"); |
| 1544 | goto cifs_parse_mount_err; |
| 1545 | } |
| 1546 | break; |
| 1547 | |
| 1548 | /* String Arguments */ |
| 1549 | |
| 1550 | case Opt_blank_user: |
| 1551 | /* null user, ie. anonymous authentication */ |
| 1552 | vol->nullauth = 1; |
| 1553 | vol->username = NULL; |
| 1554 | break; |
| 1555 | case Opt_user: |
| 1556 | string = match_strdup(args); |
| 1557 | if (string == NULL) |
| 1558 | goto out_nomem; |
| 1559 | |
| 1560 | if (strnlen(string, MAX_USERNAME_SIZE) > |
| 1561 | MAX_USERNAME_SIZE) { |
| 1562 | printk(KERN_WARNING "CIFS: username too long\n"); |
| 1563 | goto cifs_parse_mount_err; |
| 1564 | } |
| 1565 | vol->username = kstrdup(string, GFP_KERNEL); |
| 1566 | if (!vol->username) |
| 1567 | goto cifs_parse_mount_err; |
| 1568 | break; |
| 1569 | case Opt_blank_pass: |
| 1570 | /* passwords have to be handled differently |
| 1571 | * to allow the character used for deliminator |
| 1572 | * to be passed within them |
| 1573 | */ |
| 1574 | |
| 1575 | /* |
| 1576 | * Check if this is a case where the password |
| 1577 | * starts with a delimiter |
| 1578 | */ |
| 1579 | tmp_end = strchr(data, '='); |
| 1580 | tmp_end++; |
| 1581 | if (!(tmp_end < end && tmp_end[1] == delim)) { |
| 1582 | /* No it is not. Set the password to NULL */ |
| 1583 | vol->password = NULL; |
| 1584 | break; |
| 1585 | } |
| 1586 | /* Yes it is. Drop down to Opt_pass below.*/ |
| 1587 | case Opt_pass: |
| 1588 | /* Obtain the value string */ |
| 1589 | value = strchr(data, '='); |
| 1590 | value++; |
| 1591 | |
| 1592 | /* Set tmp_end to end of the string */ |
| 1593 | tmp_end = (char *) value + strlen(value); |
| 1594 | |
| 1595 | /* Check if following character is the deliminator |
| 1596 | * If yes, we have encountered a double deliminator |
| 1597 | * reset the NULL character to the deliminator |
| 1598 | */ |
| 1599 | if (tmp_end < end && tmp_end[1] == delim) { |
| 1600 | tmp_end[0] = delim; |
| 1601 | |
| 1602 | /* Keep iterating until we get to a single |
| 1603 | * deliminator OR the end |
| 1604 | */ |
| 1605 | while ((tmp_end = strchr(tmp_end, delim)) |
| 1606 | != NULL && (tmp_end[1] == delim)) { |
| 1607 | tmp_end = (char *) &tmp_end[2]; |
| 1608 | } |
| 1609 | |
| 1610 | /* Reset var options to point to next element */ |
| 1611 | if (tmp_end) { |
| 1612 | tmp_end[0] = '\0'; |
| 1613 | options = (char *) &tmp_end[1]; |
| 1614 | } else |
| 1615 | /* Reached the end of the mount option |
| 1616 | * string */ |
| 1617 | options = end; |
| 1618 | } |
| 1619 | |
| 1620 | /* Now build new password string */ |
| 1621 | temp_len = strlen(value); |
| 1622 | vol->password = kzalloc(temp_len+1, GFP_KERNEL); |
| 1623 | if (vol->password == NULL) { |
| 1624 | printk(KERN_WARNING "CIFS: no memory " |
| 1625 | "for password\n"); |
| 1626 | goto cifs_parse_mount_err; |
| 1627 | } |
| 1628 | |
| 1629 | for (i = 0, j = 0; i < temp_len; i++, j++) { |
| 1630 | vol->password[j] = value[i]; |
| 1631 | if ((value[i] == delim) && |
| 1632 | value[i+1] == delim) |
| 1633 | /* skip the second deliminator */ |
| 1634 | i++; |
| 1635 | } |
| 1636 | vol->password[j] = '\0'; |
| 1637 | break; |
| 1638 | case Opt_blank_ip: |
| 1639 | /* FIXME: should this be an error instead? */ |
| 1640 | got_ip = false; |
| 1641 | break; |
| 1642 | case Opt_ip: |
| 1643 | string = match_strdup(args); |
| 1644 | if (string == NULL) |
| 1645 | goto out_nomem; |
| 1646 | |
| 1647 | if (!cifs_convert_address(dstaddr, string, |
| 1648 | strlen(string))) { |
| 1649 | printk(KERN_ERR "CIFS: bad ip= option (%s).\n", |
| 1650 | string); |
| 1651 | goto cifs_parse_mount_err; |
| 1652 | } |
| 1653 | got_ip = true; |
| 1654 | break; |
| 1655 | case Opt_domain: |
| 1656 | string = match_strdup(args); |
| 1657 | if (string == NULL) |
| 1658 | goto out_nomem; |
| 1659 | |
| 1660 | if (strnlen(string, 256) == 256) { |
| 1661 | printk(KERN_WARNING "CIFS: domain name too" |
| 1662 | " long\n"); |
| 1663 | goto cifs_parse_mount_err; |
| 1664 | } |
| 1665 | |
| 1666 | vol->domainname = kstrdup(string, GFP_KERNEL); |
| 1667 | if (!vol->domainname) { |
| 1668 | printk(KERN_WARNING "CIFS: no memory " |
| 1669 | "for domainname\n"); |
| 1670 | goto cifs_parse_mount_err; |
| 1671 | } |
| 1672 | cifs_dbg(FYI, "Domain name set\n"); |
| 1673 | break; |
| 1674 | case Opt_srcaddr: |
| 1675 | string = match_strdup(args); |
| 1676 | if (string == NULL) |
| 1677 | goto out_nomem; |
| 1678 | |
| 1679 | if (!cifs_convert_address( |
| 1680 | (struct sockaddr *)&vol->srcaddr, |
| 1681 | string, strlen(string))) { |
| 1682 | printk(KERN_WARNING "CIFS: Could not parse" |
| 1683 | " srcaddr: %s\n", string); |
| 1684 | goto cifs_parse_mount_err; |
| 1685 | } |
| 1686 | break; |
| 1687 | case Opt_iocharset: |
| 1688 | string = match_strdup(args); |
| 1689 | if (string == NULL) |
| 1690 | goto out_nomem; |
| 1691 | |
| 1692 | if (strnlen(string, 1024) >= 65) { |
| 1693 | printk(KERN_WARNING "CIFS: iocharset name " |
| 1694 | "too long.\n"); |
| 1695 | goto cifs_parse_mount_err; |
| 1696 | } |
| 1697 | |
| 1698 | if (strnicmp(string, "default", 7) != 0) { |
| 1699 | vol->iocharset = kstrdup(string, |
| 1700 | GFP_KERNEL); |
| 1701 | if (!vol->iocharset) { |
| 1702 | printk(KERN_WARNING "CIFS: no memory" |
| 1703 | "for charset\n"); |
| 1704 | goto cifs_parse_mount_err; |
| 1705 | } |
| 1706 | } |
| 1707 | /* if iocharset not set then load_nls_default |
| 1708 | * is used by caller |
| 1709 | */ |
| 1710 | cifs_dbg(FYI, "iocharset set to %s\n", string); |
| 1711 | break; |
| 1712 | case Opt_netbiosname: |
| 1713 | string = match_strdup(args); |
| 1714 | if (string == NULL) |
| 1715 | goto out_nomem; |
| 1716 | |
| 1717 | memset(vol->source_rfc1001_name, 0x20, |
| 1718 | RFC1001_NAME_LEN); |
| 1719 | /* |
| 1720 | * FIXME: are there cases in which a comma can |
| 1721 | * be valid in workstation netbios name (and |
| 1722 | * need special handling)? |
| 1723 | */ |
| 1724 | for (i = 0; i < RFC1001_NAME_LEN; i++) { |
| 1725 | /* don't ucase netbiosname for user */ |
| 1726 | if (string[i] == 0) |
| 1727 | break; |
| 1728 | vol->source_rfc1001_name[i] = string[i]; |
| 1729 | } |
| 1730 | /* The string has 16th byte zero still from |
| 1731 | * set at top of the function |
| 1732 | */ |
| 1733 | if (i == RFC1001_NAME_LEN && string[i] != 0) |
| 1734 | printk(KERN_WARNING "CIFS: netbiosname" |
| 1735 | " longer than 15 truncated.\n"); |
| 1736 | |
| 1737 | break; |
| 1738 | case Opt_servern: |
| 1739 | /* servernetbiosname specified override *SMBSERVER */ |
| 1740 | string = match_strdup(args); |
| 1741 | if (string == NULL) |
| 1742 | goto out_nomem; |
| 1743 | |
| 1744 | /* last byte, type, is 0x20 for servr type */ |
| 1745 | memset(vol->target_rfc1001_name, 0x20, |
| 1746 | RFC1001_NAME_LEN_WITH_NULL); |
| 1747 | |
| 1748 | /* BB are there cases in which a comma can be |
| 1749 | valid in this workstation netbios name |
| 1750 | (and need special handling)? */ |
| 1751 | |
| 1752 | /* user or mount helper must uppercase the |
| 1753 | netbios name */ |
| 1754 | for (i = 0; i < 15; i++) { |
| 1755 | if (string[i] == 0) |
| 1756 | break; |
| 1757 | vol->target_rfc1001_name[i] = string[i]; |
| 1758 | } |
| 1759 | /* The string has 16th byte zero still from |
| 1760 | set at top of the function */ |
| 1761 | if (i == RFC1001_NAME_LEN && string[i] != 0) |
| 1762 | printk(KERN_WARNING "CIFS: server net" |
| 1763 | "biosname longer than 15 truncated.\n"); |
| 1764 | break; |
| 1765 | case Opt_ver: |
| 1766 | string = match_strdup(args); |
| 1767 | if (string == NULL) |
| 1768 | goto out_nomem; |
| 1769 | |
| 1770 | if (strnicmp(string, "1", 1) == 0) { |
| 1771 | /* This is the default */ |
| 1772 | break; |
| 1773 | } |
| 1774 | /* For all other value, error */ |
| 1775 | printk(KERN_WARNING "CIFS: Invalid version" |
| 1776 | " specified\n"); |
| 1777 | goto cifs_parse_mount_err; |
| 1778 | case Opt_vers: |
| 1779 | string = match_strdup(args); |
| 1780 | if (string == NULL) |
| 1781 | goto out_nomem; |
| 1782 | |
| 1783 | if (cifs_parse_smb_version(string, vol) != 0) |
| 1784 | goto cifs_parse_mount_err; |
| 1785 | break; |
| 1786 | case Opt_sec: |
| 1787 | string = match_strdup(args); |
| 1788 | if (string == NULL) |
| 1789 | goto out_nomem; |
| 1790 | |
| 1791 | if (cifs_parse_security_flavors(string, vol) != 0) |
| 1792 | goto cifs_parse_mount_err; |
| 1793 | break; |
| 1794 | case Opt_cache: |
| 1795 | string = match_strdup(args); |
| 1796 | if (string == NULL) |
| 1797 | goto out_nomem; |
| 1798 | |
| 1799 | if (cifs_parse_cache_flavor(string, vol) != 0) |
| 1800 | goto cifs_parse_mount_err; |
| 1801 | break; |
| 1802 | default: |
| 1803 | /* |
| 1804 | * An option we don't recognize. Save it off for later |
| 1805 | * if we haven't already found one |
| 1806 | */ |
| 1807 | if (!invalid) |
| 1808 | invalid = data; |
| 1809 | break; |
| 1810 | } |
| 1811 | /* Free up any allocated string */ |
| 1812 | kfree(string); |
| 1813 | string = NULL; |
| 1814 | } |
| 1815 | |
| 1816 | if (!sloppy && invalid) { |
| 1817 | printk(KERN_ERR "CIFS: Unknown mount option \"%s\"\n", invalid); |
| 1818 | goto cifs_parse_mount_err; |
| 1819 | } |
| 1820 | |
| 1821 | #ifndef CONFIG_KEYS |
| 1822 | /* Muliuser mounts require CONFIG_KEYS support */ |
| 1823 | if (vol->multiuser) { |
| 1824 | cifs_dbg(VFS, "Multiuser mounts require kernels with CONFIG_KEYS enabled\n"); |
| 1825 | goto cifs_parse_mount_err; |
| 1826 | } |
| 1827 | #endif |
| 1828 | if (!vol->UNC) { |
| 1829 | cifs_dbg(VFS, "CIFS mount error: No usable UNC path provided in device string or in unc= option!\n"); |
| 1830 | goto cifs_parse_mount_err; |
| 1831 | } |
| 1832 | |
| 1833 | /* make sure UNC has a share name */ |
| 1834 | if (!strchr(vol->UNC + 3, '\\')) { |
| 1835 | cifs_dbg(VFS, "Malformed UNC. Unable to find share name.\n"); |
| 1836 | goto cifs_parse_mount_err; |
| 1837 | } |
| 1838 | |
| 1839 | if (!got_ip) { |
| 1840 | /* No ip= option specified? Try to get it from UNC */ |
| 1841 | if (!cifs_convert_address(dstaddr, &vol->UNC[2], |
| 1842 | strlen(&vol->UNC[2]))) { |
| 1843 | printk(KERN_ERR "Unable to determine destination " |
| 1844 | "address.\n"); |
| 1845 | goto cifs_parse_mount_err; |
| 1846 | } |
| 1847 | } |
| 1848 | |
| 1849 | /* set the port that we got earlier */ |
| 1850 | cifs_set_port(dstaddr, port); |
| 1851 | |
| 1852 | if (uid_specified) |
| 1853 | vol->override_uid = override_uid; |
| 1854 | else if (override_uid == 1) |
| 1855 | printk(KERN_NOTICE "CIFS: ignoring forceuid mount option " |
| 1856 | "specified with no uid= option.\n"); |
| 1857 | |
| 1858 | if (gid_specified) |
| 1859 | vol->override_gid = override_gid; |
| 1860 | else if (override_gid == 1) |
| 1861 | printk(KERN_NOTICE "CIFS: ignoring forcegid mount option " |
| 1862 | "specified with no gid= option.\n"); |
| 1863 | |
| 1864 | kfree(mountdata_copy); |
| 1865 | return 0; |
| 1866 | |
| 1867 | out_nomem: |
| 1868 | printk(KERN_WARNING "Could not allocate temporary buffer\n"); |
| 1869 | cifs_parse_mount_err: |
| 1870 | kfree(string); |
| 1871 | kfree(mountdata_copy); |
| 1872 | return 1; |
| 1873 | } |
| 1874 | |
| 1875 | /** Returns true if srcaddr isn't specified and rhs isn't |
| 1876 | * specified, or if srcaddr is specified and |
| 1877 | * matches the IP address of the rhs argument. |
| 1878 | */ |
| 1879 | static bool |
| 1880 | srcip_matches(struct sockaddr *srcaddr, struct sockaddr *rhs) |
| 1881 | { |
| 1882 | switch (srcaddr->sa_family) { |
| 1883 | case AF_UNSPEC: |
| 1884 | return (rhs->sa_family == AF_UNSPEC); |
| 1885 | case AF_INET: { |
| 1886 | struct sockaddr_in *saddr4 = (struct sockaddr_in *)srcaddr; |
| 1887 | struct sockaddr_in *vaddr4 = (struct sockaddr_in *)rhs; |
| 1888 | return (saddr4->sin_addr.s_addr == vaddr4->sin_addr.s_addr); |
| 1889 | } |
| 1890 | case AF_INET6: { |
| 1891 | struct sockaddr_in6 *saddr6 = (struct sockaddr_in6 *)srcaddr; |
| 1892 | struct sockaddr_in6 *vaddr6 = (struct sockaddr_in6 *)rhs; |
| 1893 | return ipv6_addr_equal(&saddr6->sin6_addr, &vaddr6->sin6_addr); |
| 1894 | } |
| 1895 | default: |
| 1896 | WARN_ON(1); |
| 1897 | return false; /* don't expect to be here */ |
| 1898 | } |
| 1899 | } |
| 1900 | |
| 1901 | /* |
| 1902 | * If no port is specified in addr structure, we try to match with 445 port |
| 1903 | * and if it fails - with 139 ports. It should be called only if address |
| 1904 | * families of server and addr are equal. |
| 1905 | */ |
| 1906 | static bool |
| 1907 | match_port(struct TCP_Server_Info *server, struct sockaddr *addr) |
| 1908 | { |
| 1909 | __be16 port, *sport; |
| 1910 | |
| 1911 | switch (addr->sa_family) { |
| 1912 | case AF_INET: |
| 1913 | sport = &((struct sockaddr_in *) &server->dstaddr)->sin_port; |
| 1914 | port = ((struct sockaddr_in *) addr)->sin_port; |
| 1915 | break; |
| 1916 | case AF_INET6: |
| 1917 | sport = &((struct sockaddr_in6 *) &server->dstaddr)->sin6_port; |
| 1918 | port = ((struct sockaddr_in6 *) addr)->sin6_port; |
| 1919 | break; |
| 1920 | default: |
| 1921 | WARN_ON(1); |
| 1922 | return false; |
| 1923 | } |
| 1924 | |
| 1925 | if (!port) { |
| 1926 | port = htons(CIFS_PORT); |
| 1927 | if (port == *sport) |
| 1928 | return true; |
| 1929 | |
| 1930 | port = htons(RFC1001_PORT); |
| 1931 | } |
| 1932 | |
| 1933 | return port == *sport; |
| 1934 | } |
| 1935 | |
| 1936 | static bool |
| 1937 | match_address(struct TCP_Server_Info *server, struct sockaddr *addr, |
| 1938 | struct sockaddr *srcaddr) |
| 1939 | { |
| 1940 | switch (addr->sa_family) { |
| 1941 | case AF_INET: { |
| 1942 | struct sockaddr_in *addr4 = (struct sockaddr_in *)addr; |
| 1943 | struct sockaddr_in *srv_addr4 = |
| 1944 | (struct sockaddr_in *)&server->dstaddr; |
| 1945 | |
| 1946 | if (addr4->sin_addr.s_addr != srv_addr4->sin_addr.s_addr) |
| 1947 | return false; |
| 1948 | break; |
| 1949 | } |
| 1950 | case AF_INET6: { |
| 1951 | struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)addr; |
| 1952 | struct sockaddr_in6 *srv_addr6 = |
| 1953 | (struct sockaddr_in6 *)&server->dstaddr; |
| 1954 | |
| 1955 | if (!ipv6_addr_equal(&addr6->sin6_addr, |
| 1956 | &srv_addr6->sin6_addr)) |
| 1957 | return false; |
| 1958 | if (addr6->sin6_scope_id != srv_addr6->sin6_scope_id) |
| 1959 | return false; |
| 1960 | break; |
| 1961 | } |
| 1962 | default: |
| 1963 | WARN_ON(1); |
| 1964 | return false; /* don't expect to be here */ |
| 1965 | } |
| 1966 | |
| 1967 | if (!srcip_matches(srcaddr, (struct sockaddr *)&server->srcaddr)) |
| 1968 | return false; |
| 1969 | |
| 1970 | return true; |
| 1971 | } |
| 1972 | |
| 1973 | static bool |
| 1974 | match_security(struct TCP_Server_Info *server, struct smb_vol *vol) |
| 1975 | { |
| 1976 | unsigned int secFlags; |
| 1977 | |
| 1978 | if (vol->secFlg & (~(CIFSSEC_MUST_SIGN | CIFSSEC_MUST_SEAL))) |
| 1979 | secFlags = vol->secFlg; |
| 1980 | else |
| 1981 | secFlags = global_secflags | vol->secFlg; |
| 1982 | |
| 1983 | switch (server->secType) { |
| 1984 | case LANMAN: |
| 1985 | if (!(secFlags & (CIFSSEC_MAY_LANMAN|CIFSSEC_MAY_PLNTXT))) |
| 1986 | return false; |
| 1987 | break; |
| 1988 | case NTLMv2: |
| 1989 | if (!(secFlags & CIFSSEC_MAY_NTLMV2)) |
| 1990 | return false; |
| 1991 | break; |
| 1992 | case NTLM: |
| 1993 | if (!(secFlags & CIFSSEC_MAY_NTLM)) |
| 1994 | return false; |
| 1995 | break; |
| 1996 | case Kerberos: |
| 1997 | if (!(secFlags & CIFSSEC_MAY_KRB5)) |
| 1998 | return false; |
| 1999 | break; |
| 2000 | case RawNTLMSSP: |
| 2001 | if (!(secFlags & CIFSSEC_MAY_NTLMSSP)) |
| 2002 | return false; |
| 2003 | break; |
| 2004 | default: |
| 2005 | /* shouldn't happen */ |
| 2006 | return false; |
| 2007 | } |
| 2008 | |
| 2009 | /* now check if signing mode is acceptable */ |
| 2010 | if ((secFlags & CIFSSEC_MAY_SIGN) == 0 && |
| 2011 | (server->sec_mode & SECMODE_SIGN_REQUIRED)) |
| 2012 | return false; |
| 2013 | else if (((secFlags & CIFSSEC_MUST_SIGN) == CIFSSEC_MUST_SIGN) && |
| 2014 | (server->sec_mode & |
| 2015 | (SECMODE_SIGN_ENABLED|SECMODE_SIGN_REQUIRED)) == 0) |
| 2016 | return false; |
| 2017 | |
| 2018 | return true; |
| 2019 | } |
| 2020 | |
| 2021 | static int match_server(struct TCP_Server_Info *server, struct smb_vol *vol) |
| 2022 | { |
| 2023 | struct sockaddr *addr = (struct sockaddr *)&vol->dstaddr; |
| 2024 | |
| 2025 | if ((server->vals != vol->vals) || (server->ops != vol->ops)) |
| 2026 | return 0; |
| 2027 | |
| 2028 | if (!net_eq(cifs_net_ns(server), current->nsproxy->net_ns)) |
| 2029 | return 0; |
| 2030 | |
| 2031 | if (!match_address(server, addr, |
| 2032 | (struct sockaddr *)&vol->srcaddr)) |
| 2033 | return 0; |
| 2034 | |
| 2035 | if (!match_port(server, addr)) |
| 2036 | return 0; |
| 2037 | |
| 2038 | if (!match_security(server, vol)) |
| 2039 | return 0; |
| 2040 | |
| 2041 | return 1; |
| 2042 | } |
| 2043 | |
| 2044 | static struct TCP_Server_Info * |
| 2045 | cifs_find_tcp_session(struct smb_vol *vol) |
| 2046 | { |
| 2047 | struct TCP_Server_Info *server; |
| 2048 | |
| 2049 | spin_lock(&cifs_tcp_ses_lock); |
| 2050 | list_for_each_entry(server, &cifs_tcp_ses_list, tcp_ses_list) { |
| 2051 | if (!match_server(server, vol)) |
| 2052 | continue; |
| 2053 | |
| 2054 | ++server->srv_count; |
| 2055 | spin_unlock(&cifs_tcp_ses_lock); |
| 2056 | cifs_dbg(FYI, "Existing tcp session with server found\n"); |
| 2057 | return server; |
| 2058 | } |
| 2059 | spin_unlock(&cifs_tcp_ses_lock); |
| 2060 | return NULL; |
| 2061 | } |
| 2062 | |
| 2063 | static void |
| 2064 | cifs_put_tcp_session(struct TCP_Server_Info *server) |
| 2065 | { |
| 2066 | struct task_struct *task; |
| 2067 | |
| 2068 | spin_lock(&cifs_tcp_ses_lock); |
| 2069 | if (--server->srv_count > 0) { |
| 2070 | spin_unlock(&cifs_tcp_ses_lock); |
| 2071 | return; |
| 2072 | } |
| 2073 | |
| 2074 | put_net(cifs_net_ns(server)); |
| 2075 | |
| 2076 | list_del_init(&server->tcp_ses_list); |
| 2077 | spin_unlock(&cifs_tcp_ses_lock); |
| 2078 | |
| 2079 | cancel_delayed_work_sync(&server->echo); |
| 2080 | |
| 2081 | spin_lock(&GlobalMid_Lock); |
| 2082 | server->tcpStatus = CifsExiting; |
| 2083 | spin_unlock(&GlobalMid_Lock); |
| 2084 | |
| 2085 | cifs_crypto_shash_release(server); |
| 2086 | cifs_fscache_release_client_cookie(server); |
| 2087 | |
| 2088 | kfree(server->session_key.response); |
| 2089 | server->session_key.response = NULL; |
| 2090 | server->session_key.len = 0; |
| 2091 | |
| 2092 | task = xchg(&server->tsk, NULL); |
| 2093 | if (task) |
| 2094 | force_sig(SIGKILL, task); |
| 2095 | } |
| 2096 | |
| 2097 | static struct TCP_Server_Info * |
| 2098 | cifs_get_tcp_session(struct smb_vol *volume_info) |
| 2099 | { |
| 2100 | struct TCP_Server_Info *tcp_ses = NULL; |
| 2101 | int rc; |
| 2102 | |
| 2103 | cifs_dbg(FYI, "UNC: %s\n", volume_info->UNC); |
| 2104 | |
| 2105 | /* see if we already have a matching tcp_ses */ |
| 2106 | tcp_ses = cifs_find_tcp_session(volume_info); |
| 2107 | if (tcp_ses) |
| 2108 | return tcp_ses; |
| 2109 | |
| 2110 | tcp_ses = kzalloc(sizeof(struct TCP_Server_Info), GFP_KERNEL); |
| 2111 | if (!tcp_ses) { |
| 2112 | rc = -ENOMEM; |
| 2113 | goto out_err; |
| 2114 | } |
| 2115 | |
| 2116 | rc = cifs_crypto_shash_allocate(tcp_ses); |
| 2117 | if (rc) { |
| 2118 | cifs_dbg(VFS, "could not setup hash structures rc %d\n", rc); |
| 2119 | goto out_err; |
| 2120 | } |
| 2121 | |
| 2122 | tcp_ses->ops = volume_info->ops; |
| 2123 | tcp_ses->vals = volume_info->vals; |
| 2124 | cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns)); |
| 2125 | tcp_ses->hostname = extract_hostname(volume_info->UNC); |
| 2126 | if (IS_ERR(tcp_ses->hostname)) { |
| 2127 | rc = PTR_ERR(tcp_ses->hostname); |
| 2128 | goto out_err_crypto_release; |
| 2129 | } |
| 2130 | |
| 2131 | tcp_ses->noblocksnd = volume_info->noblocksnd; |
| 2132 | tcp_ses->noautotune = volume_info->noautotune; |
| 2133 | tcp_ses->tcp_nodelay = volume_info->sockopt_tcp_nodelay; |
| 2134 | tcp_ses->in_flight = 0; |
| 2135 | tcp_ses->credits = 1; |
| 2136 | init_waitqueue_head(&tcp_ses->response_q); |
| 2137 | init_waitqueue_head(&tcp_ses->request_q); |
| 2138 | INIT_LIST_HEAD(&tcp_ses->pending_mid_q); |
| 2139 | mutex_init(&tcp_ses->srv_mutex); |
| 2140 | memcpy(tcp_ses->workstation_RFC1001_name, |
| 2141 | volume_info->source_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); |
| 2142 | memcpy(tcp_ses->server_RFC1001_name, |
| 2143 | volume_info->target_rfc1001_name, RFC1001_NAME_LEN_WITH_NULL); |
| 2144 | tcp_ses->session_estab = false; |
| 2145 | tcp_ses->sequence_number = 0; |
| 2146 | tcp_ses->lstrp = jiffies; |
| 2147 | spin_lock_init(&tcp_ses->req_lock); |
| 2148 | INIT_LIST_HEAD(&tcp_ses->tcp_ses_list); |
| 2149 | INIT_LIST_HEAD(&tcp_ses->smb_ses_list); |
| 2150 | INIT_DELAYED_WORK(&tcp_ses->echo, cifs_echo_request); |
| 2151 | memcpy(&tcp_ses->srcaddr, &volume_info->srcaddr, |
| 2152 | sizeof(tcp_ses->srcaddr)); |
| 2153 | memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr, |
| 2154 | sizeof(tcp_ses->dstaddr)); |
| 2155 | /* |
| 2156 | * at this point we are the only ones with the pointer |
| 2157 | * to the struct since the kernel thread not created yet |
| 2158 | * no need to spinlock this init of tcpStatus or srv_count |
| 2159 | */ |
| 2160 | tcp_ses->tcpStatus = CifsNew; |
| 2161 | ++tcp_ses->srv_count; |
| 2162 | |
| 2163 | rc = ip_connect(tcp_ses); |
| 2164 | if (rc < 0) { |
| 2165 | cifs_dbg(VFS, "Error connecting to socket. Aborting operation.\n"); |
| 2166 | goto out_err_crypto_release; |
| 2167 | } |
| 2168 | |
| 2169 | /* |
| 2170 | * since we're in a cifs function already, we know that |
| 2171 | * this will succeed. No need for try_module_get(). |
| 2172 | */ |
| 2173 | __module_get(THIS_MODULE); |
| 2174 | tcp_ses->tsk = kthread_run(cifs_demultiplex_thread, |
| 2175 | tcp_ses, "cifsd"); |
| 2176 | if (IS_ERR(tcp_ses->tsk)) { |
| 2177 | rc = PTR_ERR(tcp_ses->tsk); |
| 2178 | cifs_dbg(VFS, "error %d create cifsd thread\n", rc); |
| 2179 | module_put(THIS_MODULE); |
| 2180 | goto out_err_crypto_release; |
| 2181 | } |
| 2182 | tcp_ses->tcpStatus = CifsNeedNegotiate; |
| 2183 | |
| 2184 | /* thread spawned, put it on the list */ |
| 2185 | spin_lock(&cifs_tcp_ses_lock); |
| 2186 | list_add(&tcp_ses->tcp_ses_list, &cifs_tcp_ses_list); |
| 2187 | spin_unlock(&cifs_tcp_ses_lock); |
| 2188 | |
| 2189 | cifs_fscache_get_client_cookie(tcp_ses); |
| 2190 | |
| 2191 | /* queue echo request delayed work */ |
| 2192 | queue_delayed_work(cifsiod_wq, &tcp_ses->echo, SMB_ECHO_INTERVAL); |
| 2193 | |
| 2194 | return tcp_ses; |
| 2195 | |
| 2196 | out_err_crypto_release: |
| 2197 | cifs_crypto_shash_release(tcp_ses); |
| 2198 | |
| 2199 | put_net(cifs_net_ns(tcp_ses)); |
| 2200 | |
| 2201 | out_err: |
| 2202 | if (tcp_ses) { |
| 2203 | if (!IS_ERR(tcp_ses->hostname)) |
| 2204 | kfree(tcp_ses->hostname); |
| 2205 | if (tcp_ses->ssocket) |
| 2206 | sock_release(tcp_ses->ssocket); |
| 2207 | kfree(tcp_ses); |
| 2208 | } |
| 2209 | return ERR_PTR(rc); |
| 2210 | } |
| 2211 | |
| 2212 | static int match_session(struct cifs_ses *ses, struct smb_vol *vol) |
| 2213 | { |
| 2214 | switch (ses->server->secType) { |
| 2215 | case Kerberos: |
| 2216 | if (!uid_eq(vol->cred_uid, ses->cred_uid)) |
| 2217 | return 0; |
| 2218 | break; |
| 2219 | default: |
| 2220 | /* NULL username means anonymous session */ |
| 2221 | if (ses->user_name == NULL) { |
| 2222 | if (!vol->nullauth) |
| 2223 | return 0; |
| 2224 | break; |
| 2225 | } |
| 2226 | |
| 2227 | /* anything else takes username/password */ |
| 2228 | if (strncmp(ses->user_name, |
| 2229 | vol->username ? vol->username : "", |
| 2230 | MAX_USERNAME_SIZE)) |
| 2231 | return 0; |
| 2232 | if (strlen(vol->username) != 0 && |
| 2233 | ses->password != NULL && |
| 2234 | strncmp(ses->password, |
| 2235 | vol->password ? vol->password : "", |
| 2236 | MAX_PASSWORD_SIZE)) |
| 2237 | return 0; |
| 2238 | } |
| 2239 | return 1; |
| 2240 | } |
| 2241 | |
| 2242 | static struct cifs_ses * |
| 2243 | cifs_find_smb_ses(struct TCP_Server_Info *server, struct smb_vol *vol) |
| 2244 | { |
| 2245 | struct cifs_ses *ses; |
| 2246 | |
| 2247 | spin_lock(&cifs_tcp_ses_lock); |
| 2248 | list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) { |
| 2249 | if (!match_session(ses, vol)) |
| 2250 | continue; |
| 2251 | ++ses->ses_count; |
| 2252 | spin_unlock(&cifs_tcp_ses_lock); |
| 2253 | return ses; |
| 2254 | } |
| 2255 | spin_unlock(&cifs_tcp_ses_lock); |
| 2256 | return NULL; |
| 2257 | } |
| 2258 | |
| 2259 | static void |
| 2260 | cifs_put_smb_ses(struct cifs_ses *ses) |
| 2261 | { |
| 2262 | unsigned int xid; |
| 2263 | struct TCP_Server_Info *server = ses->server; |
| 2264 | |
| 2265 | cifs_dbg(FYI, "%s: ses_count=%d\n", __func__, ses->ses_count); |
| 2266 | spin_lock(&cifs_tcp_ses_lock); |
| 2267 | if (--ses->ses_count > 0) { |
| 2268 | spin_unlock(&cifs_tcp_ses_lock); |
| 2269 | return; |
| 2270 | } |
| 2271 | |
| 2272 | list_del_init(&ses->smb_ses_list); |
| 2273 | spin_unlock(&cifs_tcp_ses_lock); |
| 2274 | |
| 2275 | if (ses->status == CifsGood && server->ops->logoff) { |
| 2276 | xid = get_xid(); |
| 2277 | server->ops->logoff(xid, ses); |
| 2278 | _free_xid(xid); |
| 2279 | } |
| 2280 | sesInfoFree(ses); |
| 2281 | cifs_put_tcp_session(server); |
| 2282 | } |
| 2283 | |
| 2284 | #ifdef CONFIG_KEYS |
| 2285 | |
| 2286 | /* strlen("cifs:a:") + INET6_ADDRSTRLEN + 1 */ |
| 2287 | #define CIFSCREDS_DESC_SIZE (7 + INET6_ADDRSTRLEN + 1) |
| 2288 | |
| 2289 | /* Populate username and pw fields from keyring if possible */ |
| 2290 | static int |
| 2291 | cifs_set_cifscreds(struct smb_vol *vol, struct cifs_ses *ses) |
| 2292 | { |
| 2293 | int rc = 0; |
| 2294 | char *desc, *delim, *payload; |
| 2295 | ssize_t len; |
| 2296 | struct key *key; |
| 2297 | struct TCP_Server_Info *server = ses->server; |
| 2298 | struct sockaddr_in *sa; |
| 2299 | struct sockaddr_in6 *sa6; |
| 2300 | struct user_key_payload *upayload; |
| 2301 | |
| 2302 | desc = kmalloc(CIFSCREDS_DESC_SIZE, GFP_KERNEL); |
| 2303 | if (!desc) |
| 2304 | return -ENOMEM; |
| 2305 | |
| 2306 | /* try to find an address key first */ |
| 2307 | switch (server->dstaddr.ss_family) { |
| 2308 | case AF_INET: |
| 2309 | sa = (struct sockaddr_in *)&server->dstaddr; |
| 2310 | sprintf(desc, "cifs:a:%pI4", &sa->sin_addr.s_addr); |
| 2311 | break; |
| 2312 | case AF_INET6: |
| 2313 | sa6 = (struct sockaddr_in6 *)&server->dstaddr; |
| 2314 | sprintf(desc, "cifs:a:%pI6c", &sa6->sin6_addr.s6_addr); |
| 2315 | break; |
| 2316 | default: |
| 2317 | cifs_dbg(FYI, "Bad ss_family (%hu)\n", |
| 2318 | server->dstaddr.ss_family); |
| 2319 | rc = -EINVAL; |
| 2320 | goto out_err; |
| 2321 | } |
| 2322 | |
| 2323 | cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc); |
| 2324 | key = request_key(&key_type_logon, desc, ""); |
| 2325 | if (IS_ERR(key)) { |
| 2326 | if (!ses->domainName) { |
| 2327 | cifs_dbg(FYI, "domainName is NULL\n"); |
| 2328 | rc = PTR_ERR(key); |
| 2329 | goto out_err; |
| 2330 | } |
| 2331 | |
| 2332 | /* didn't work, try to find a domain key */ |
| 2333 | sprintf(desc, "cifs:d:%s", ses->domainName); |
| 2334 | cifs_dbg(FYI, "%s: desc=%s\n", __func__, desc); |
| 2335 | key = request_key(&key_type_logon, desc, ""); |
| 2336 | if (IS_ERR(key)) { |
| 2337 | rc = PTR_ERR(key); |
| 2338 | goto out_err; |
| 2339 | } |
| 2340 | } |
| 2341 | |
| 2342 | down_read(&key->sem); |
| 2343 | upayload = key->payload.data; |
| 2344 | if (IS_ERR_OR_NULL(upayload)) { |
| 2345 | rc = upayload ? PTR_ERR(upayload) : -EINVAL; |
| 2346 | goto out_key_put; |
| 2347 | } |
| 2348 | |
| 2349 | /* find first : in payload */ |
| 2350 | payload = (char *)upayload->data; |
| 2351 | delim = strnchr(payload, upayload->datalen, ':'); |
| 2352 | cifs_dbg(FYI, "payload=%s\n", payload); |
| 2353 | if (!delim) { |
| 2354 | cifs_dbg(FYI, "Unable to find ':' in payload (datalen=%d)\n", |
| 2355 | upayload->datalen); |
| 2356 | rc = -EINVAL; |
| 2357 | goto out_key_put; |
| 2358 | } |
| 2359 | |
| 2360 | len = delim - payload; |
| 2361 | if (len > MAX_USERNAME_SIZE || len <= 0) { |
| 2362 | cifs_dbg(FYI, "Bad value from username search (len=%zd)\n", |
| 2363 | len); |
| 2364 | rc = -EINVAL; |
| 2365 | goto out_key_put; |
| 2366 | } |
| 2367 | |
| 2368 | vol->username = kstrndup(payload, len, GFP_KERNEL); |
| 2369 | if (!vol->username) { |
| 2370 | cifs_dbg(FYI, "Unable to allocate %zd bytes for username\n", |
| 2371 | len); |
| 2372 | rc = -ENOMEM; |
| 2373 | goto out_key_put; |
| 2374 | } |
| 2375 | cifs_dbg(FYI, "%s: username=%s\n", __func__, vol->username); |
| 2376 | |
| 2377 | len = key->datalen - (len + 1); |
| 2378 | if (len > MAX_PASSWORD_SIZE || len <= 0) { |
| 2379 | cifs_dbg(FYI, "Bad len for password search (len=%zd)\n", len); |
| 2380 | rc = -EINVAL; |
| 2381 | kfree(vol->username); |
| 2382 | vol->username = NULL; |
| 2383 | goto out_key_put; |
| 2384 | } |
| 2385 | |
| 2386 | ++delim; |
| 2387 | vol->password = kstrndup(delim, len, GFP_KERNEL); |
| 2388 | if (!vol->password) { |
| 2389 | cifs_dbg(FYI, "Unable to allocate %zd bytes for password\n", |
| 2390 | len); |
| 2391 | rc = -ENOMEM; |
| 2392 | kfree(vol->username); |
| 2393 | vol->username = NULL; |
| 2394 | goto out_key_put; |
| 2395 | } |
| 2396 | |
| 2397 | out_key_put: |
| 2398 | up_read(&key->sem); |
| 2399 | key_put(key); |
| 2400 | out_err: |
| 2401 | kfree(desc); |
| 2402 | cifs_dbg(FYI, "%s: returning %d\n", __func__, rc); |
| 2403 | return rc; |
| 2404 | } |
| 2405 | #else /* ! CONFIG_KEYS */ |
| 2406 | static inline int |
| 2407 | cifs_set_cifscreds(struct smb_vol *vol __attribute__((unused)), |
| 2408 | struct cifs_ses *ses __attribute__((unused))) |
| 2409 | { |
| 2410 | return -ENOSYS; |
| 2411 | } |
| 2412 | #endif /* CONFIG_KEYS */ |
| 2413 | |
| 2414 | static struct cifs_ses * |
| 2415 | cifs_get_smb_ses(struct TCP_Server_Info *server, struct smb_vol *volume_info) |
| 2416 | { |
| 2417 | int rc = -ENOMEM; |
| 2418 | unsigned int xid; |
| 2419 | struct cifs_ses *ses; |
| 2420 | struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; |
| 2421 | struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; |
| 2422 | |
| 2423 | xid = get_xid(); |
| 2424 | |
| 2425 | ses = cifs_find_smb_ses(server, volume_info); |
| 2426 | if (ses) { |
| 2427 | cifs_dbg(FYI, "Existing smb sess found (status=%d)\n", |
| 2428 | ses->status); |
| 2429 | |
| 2430 | mutex_lock(&ses->session_mutex); |
| 2431 | rc = cifs_negotiate_protocol(xid, ses); |
| 2432 | if (rc) { |
| 2433 | mutex_unlock(&ses->session_mutex); |
| 2434 | /* problem -- put our ses reference */ |
| 2435 | cifs_put_smb_ses(ses); |
| 2436 | free_xid(xid); |
| 2437 | return ERR_PTR(rc); |
| 2438 | } |
| 2439 | if (ses->need_reconnect) { |
| 2440 | cifs_dbg(FYI, "Session needs reconnect\n"); |
| 2441 | rc = cifs_setup_session(xid, ses, |
| 2442 | volume_info->local_nls); |
| 2443 | if (rc) { |
| 2444 | mutex_unlock(&ses->session_mutex); |
| 2445 | /* problem -- put our reference */ |
| 2446 | cifs_put_smb_ses(ses); |
| 2447 | free_xid(xid); |
| 2448 | return ERR_PTR(rc); |
| 2449 | } |
| 2450 | } |
| 2451 | mutex_unlock(&ses->session_mutex); |
| 2452 | |
| 2453 | /* existing SMB ses has a server reference already */ |
| 2454 | cifs_put_tcp_session(server); |
| 2455 | free_xid(xid); |
| 2456 | return ses; |
| 2457 | } |
| 2458 | |
| 2459 | cifs_dbg(FYI, "Existing smb sess not found\n"); |
| 2460 | ses = sesInfoAlloc(); |
| 2461 | if (ses == NULL) |
| 2462 | goto get_ses_fail; |
| 2463 | |
| 2464 | /* new SMB session uses our server ref */ |
| 2465 | ses->server = server; |
| 2466 | if (server->dstaddr.ss_family == AF_INET6) |
| 2467 | sprintf(ses->serverName, "%pI6", &addr6->sin6_addr); |
| 2468 | else |
| 2469 | sprintf(ses->serverName, "%pI4", &addr->sin_addr); |
| 2470 | |
| 2471 | if (volume_info->username) { |
| 2472 | ses->user_name = kstrdup(volume_info->username, GFP_KERNEL); |
| 2473 | if (!ses->user_name) |
| 2474 | goto get_ses_fail; |
| 2475 | } |
| 2476 | |
| 2477 | /* volume_info->password freed at unmount */ |
| 2478 | if (volume_info->password) { |
| 2479 | ses->password = kstrdup(volume_info->password, GFP_KERNEL); |
| 2480 | if (!ses->password) |
| 2481 | goto get_ses_fail; |
| 2482 | } |
| 2483 | if (volume_info->domainname) { |
| 2484 | ses->domainName = kstrdup(volume_info->domainname, GFP_KERNEL); |
| 2485 | if (!ses->domainName) |
| 2486 | goto get_ses_fail; |
| 2487 | } |
| 2488 | ses->cred_uid = volume_info->cred_uid; |
| 2489 | ses->linux_uid = volume_info->linux_uid; |
| 2490 | |
| 2491 | ses->overrideSecFlg = volume_info->secFlg; |
| 2492 | |
| 2493 | mutex_lock(&ses->session_mutex); |
| 2494 | rc = cifs_negotiate_protocol(xid, ses); |
| 2495 | if (!rc) |
| 2496 | rc = cifs_setup_session(xid, ses, volume_info->local_nls); |
| 2497 | mutex_unlock(&ses->session_mutex); |
| 2498 | if (rc) |
| 2499 | goto get_ses_fail; |
| 2500 | |
| 2501 | /* success, put it on the list */ |
| 2502 | spin_lock(&cifs_tcp_ses_lock); |
| 2503 | list_add(&ses->smb_ses_list, &server->smb_ses_list); |
| 2504 | spin_unlock(&cifs_tcp_ses_lock); |
| 2505 | |
| 2506 | free_xid(xid); |
| 2507 | return ses; |
| 2508 | |
| 2509 | get_ses_fail: |
| 2510 | sesInfoFree(ses); |
| 2511 | free_xid(xid); |
| 2512 | return ERR_PTR(rc); |
| 2513 | } |
| 2514 | |
| 2515 | static int match_tcon(struct cifs_tcon *tcon, const char *unc) |
| 2516 | { |
| 2517 | if (tcon->tidStatus == CifsExiting) |
| 2518 | return 0; |
| 2519 | if (strncmp(tcon->treeName, unc, MAX_TREE_SIZE)) |
| 2520 | return 0; |
| 2521 | return 1; |
| 2522 | } |
| 2523 | |
| 2524 | static struct cifs_tcon * |
| 2525 | cifs_find_tcon(struct cifs_ses *ses, const char *unc) |
| 2526 | { |
| 2527 | struct list_head *tmp; |
| 2528 | struct cifs_tcon *tcon; |
| 2529 | |
| 2530 | spin_lock(&cifs_tcp_ses_lock); |
| 2531 | list_for_each(tmp, &ses->tcon_list) { |
| 2532 | tcon = list_entry(tmp, struct cifs_tcon, tcon_list); |
| 2533 | if (!match_tcon(tcon, unc)) |
| 2534 | continue; |
| 2535 | ++tcon->tc_count; |
| 2536 | spin_unlock(&cifs_tcp_ses_lock); |
| 2537 | return tcon; |
| 2538 | } |
| 2539 | spin_unlock(&cifs_tcp_ses_lock); |
| 2540 | return NULL; |
| 2541 | } |
| 2542 | |
| 2543 | static void |
| 2544 | cifs_put_tcon(struct cifs_tcon *tcon) |
| 2545 | { |
| 2546 | unsigned int xid; |
| 2547 | struct cifs_ses *ses = tcon->ses; |
| 2548 | |
| 2549 | cifs_dbg(FYI, "%s: tc_count=%d\n", __func__, tcon->tc_count); |
| 2550 | spin_lock(&cifs_tcp_ses_lock); |
| 2551 | if (--tcon->tc_count > 0) { |
| 2552 | spin_unlock(&cifs_tcp_ses_lock); |
| 2553 | return; |
| 2554 | } |
| 2555 | |
| 2556 | list_del_init(&tcon->tcon_list); |
| 2557 | spin_unlock(&cifs_tcp_ses_lock); |
| 2558 | |
| 2559 | xid = get_xid(); |
| 2560 | if (ses->server->ops->tree_disconnect) |
| 2561 | ses->server->ops->tree_disconnect(xid, tcon); |
| 2562 | _free_xid(xid); |
| 2563 | |
| 2564 | cifs_fscache_release_super_cookie(tcon); |
| 2565 | tconInfoFree(tcon); |
| 2566 | cifs_put_smb_ses(ses); |
| 2567 | } |
| 2568 | |
| 2569 | static struct cifs_tcon * |
| 2570 | cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info) |
| 2571 | { |
| 2572 | int rc, xid; |
| 2573 | struct cifs_tcon *tcon; |
| 2574 | |
| 2575 | tcon = cifs_find_tcon(ses, volume_info->UNC); |
| 2576 | if (tcon) { |
| 2577 | cifs_dbg(FYI, "Found match on UNC path\n"); |
| 2578 | /* existing tcon already has a reference */ |
| 2579 | cifs_put_smb_ses(ses); |
| 2580 | if (tcon->seal != volume_info->seal) |
| 2581 | cifs_dbg(VFS, "transport encryption setting conflicts with existing tid\n"); |
| 2582 | return tcon; |
| 2583 | } |
| 2584 | |
| 2585 | if (!ses->server->ops->tree_connect) { |
| 2586 | rc = -ENOSYS; |
| 2587 | goto out_fail; |
| 2588 | } |
| 2589 | |
| 2590 | tcon = tconInfoAlloc(); |
| 2591 | if (tcon == NULL) { |
| 2592 | rc = -ENOMEM; |
| 2593 | goto out_fail; |
| 2594 | } |
| 2595 | |
| 2596 | tcon->ses = ses; |
| 2597 | if (volume_info->password) { |
| 2598 | tcon->password = kstrdup(volume_info->password, GFP_KERNEL); |
| 2599 | if (!tcon->password) { |
| 2600 | rc = -ENOMEM; |
| 2601 | goto out_fail; |
| 2602 | } |
| 2603 | } |
| 2604 | |
| 2605 | /* |
| 2606 | * BB Do we need to wrap session_mutex around this TCon call and Unix |
| 2607 | * SetFS as we do on SessSetup and reconnect? |
| 2608 | */ |
| 2609 | xid = get_xid(); |
| 2610 | rc = ses->server->ops->tree_connect(xid, ses, volume_info->UNC, tcon, |
| 2611 | volume_info->local_nls); |
| 2612 | free_xid(xid); |
| 2613 | cifs_dbg(FYI, "Tcon rc = %d\n", rc); |
| 2614 | if (rc) |
| 2615 | goto out_fail; |
| 2616 | |
| 2617 | if (volume_info->nodfs) { |
| 2618 | tcon->Flags &= ~SMB_SHARE_IS_IN_DFS; |
| 2619 | cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags); |
| 2620 | } |
| 2621 | tcon->seal = volume_info->seal; |
| 2622 | /* |
| 2623 | * We can have only one retry value for a connection to a share so for |
| 2624 | * resources mounted more than once to the same server share the last |
| 2625 | * value passed in for the retry flag is used. |
| 2626 | */ |
| 2627 | tcon->retry = volume_info->retry; |
| 2628 | tcon->nocase = volume_info->nocase; |
| 2629 | tcon->local_lease = volume_info->local_lease; |
| 2630 | INIT_LIST_HEAD(&tcon->pending_opens); |
| 2631 | |
| 2632 | spin_lock(&cifs_tcp_ses_lock); |
| 2633 | list_add(&tcon->tcon_list, &ses->tcon_list); |
| 2634 | spin_unlock(&cifs_tcp_ses_lock); |
| 2635 | |
| 2636 | cifs_fscache_get_super_cookie(tcon); |
| 2637 | |
| 2638 | return tcon; |
| 2639 | |
| 2640 | out_fail: |
| 2641 | tconInfoFree(tcon); |
| 2642 | return ERR_PTR(rc); |
| 2643 | } |
| 2644 | |
| 2645 | void |
| 2646 | cifs_put_tlink(struct tcon_link *tlink) |
| 2647 | { |
| 2648 | if (!tlink || IS_ERR(tlink)) |
| 2649 | return; |
| 2650 | |
| 2651 | if (!atomic_dec_and_test(&tlink->tl_count) || |
| 2652 | test_bit(TCON_LINK_IN_TREE, &tlink->tl_flags)) { |
| 2653 | tlink->tl_time = jiffies; |
| 2654 | return; |
| 2655 | } |
| 2656 | |
| 2657 | if (!IS_ERR(tlink_tcon(tlink))) |
| 2658 | cifs_put_tcon(tlink_tcon(tlink)); |
| 2659 | kfree(tlink); |
| 2660 | return; |
| 2661 | } |
| 2662 | |
| 2663 | static inline struct tcon_link * |
| 2664 | cifs_sb_master_tlink(struct cifs_sb_info *cifs_sb) |
| 2665 | { |
| 2666 | return cifs_sb->master_tlink; |
| 2667 | } |
| 2668 | |
| 2669 | static int |
| 2670 | compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data) |
| 2671 | { |
| 2672 | struct cifs_sb_info *old = CIFS_SB(sb); |
| 2673 | struct cifs_sb_info *new = mnt_data->cifs_sb; |
| 2674 | |
| 2675 | if ((sb->s_flags & CIFS_MS_MASK) != (mnt_data->flags & CIFS_MS_MASK)) |
| 2676 | return 0; |
| 2677 | |
| 2678 | if ((old->mnt_cifs_flags & CIFS_MOUNT_MASK) != |
| 2679 | (new->mnt_cifs_flags & CIFS_MOUNT_MASK)) |
| 2680 | return 0; |
| 2681 | |
| 2682 | /* |
| 2683 | * We want to share sb only if we don't specify an r/wsize or |
| 2684 | * specified r/wsize is greater than or equal to existing one. |
| 2685 | */ |
| 2686 | if (new->wsize && new->wsize < old->wsize) |
| 2687 | return 0; |
| 2688 | |
| 2689 | if (new->rsize && new->rsize < old->rsize) |
| 2690 | return 0; |
| 2691 | |
| 2692 | if (!uid_eq(old->mnt_uid, new->mnt_uid) || !gid_eq(old->mnt_gid, new->mnt_gid)) |
| 2693 | return 0; |
| 2694 | |
| 2695 | if (old->mnt_file_mode != new->mnt_file_mode || |
| 2696 | old->mnt_dir_mode != new->mnt_dir_mode) |
| 2697 | return 0; |
| 2698 | |
| 2699 | if (strcmp(old->local_nls->charset, new->local_nls->charset)) |
| 2700 | return 0; |
| 2701 | |
| 2702 | if (old->actimeo != new->actimeo) |
| 2703 | return 0; |
| 2704 | |
| 2705 | return 1; |
| 2706 | } |
| 2707 | |
| 2708 | int |
| 2709 | cifs_match_super(struct super_block *sb, void *data) |
| 2710 | { |
| 2711 | struct cifs_mnt_data *mnt_data = (struct cifs_mnt_data *)data; |
| 2712 | struct smb_vol *volume_info; |
| 2713 | struct cifs_sb_info *cifs_sb; |
| 2714 | struct TCP_Server_Info *tcp_srv; |
| 2715 | struct cifs_ses *ses; |
| 2716 | struct cifs_tcon *tcon; |
| 2717 | struct tcon_link *tlink; |
| 2718 | int rc = 0; |
| 2719 | |
| 2720 | spin_lock(&cifs_tcp_ses_lock); |
| 2721 | cifs_sb = CIFS_SB(sb); |
| 2722 | tlink = cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); |
| 2723 | if (IS_ERR(tlink)) { |
| 2724 | spin_unlock(&cifs_tcp_ses_lock); |
| 2725 | return rc; |
| 2726 | } |
| 2727 | tcon = tlink_tcon(tlink); |
| 2728 | ses = tcon->ses; |
| 2729 | tcp_srv = ses->server; |
| 2730 | |
| 2731 | volume_info = mnt_data->vol; |
| 2732 | |
| 2733 | if (!match_server(tcp_srv, volume_info) || |
| 2734 | !match_session(ses, volume_info) || |
| 2735 | !match_tcon(tcon, volume_info->UNC)) { |
| 2736 | rc = 0; |
| 2737 | goto out; |
| 2738 | } |
| 2739 | |
| 2740 | rc = compare_mount_options(sb, mnt_data); |
| 2741 | out: |
| 2742 | spin_unlock(&cifs_tcp_ses_lock); |
| 2743 | cifs_put_tlink(tlink); |
| 2744 | return rc; |
| 2745 | } |
| 2746 | |
| 2747 | int |
| 2748 | get_dfs_path(const unsigned int xid, struct cifs_ses *ses, const char *old_path, |
| 2749 | const struct nls_table *nls_codepage, unsigned int *num_referrals, |
| 2750 | struct dfs_info3_param **referrals, int remap) |
| 2751 | { |
| 2752 | char *temp_unc; |
| 2753 | int rc = 0; |
| 2754 | |
| 2755 | if (!ses->server->ops->tree_connect || !ses->server->ops->get_dfs_refer) |
| 2756 | return -ENOSYS; |
| 2757 | |
| 2758 | *num_referrals = 0; |
| 2759 | *referrals = NULL; |
| 2760 | |
| 2761 | if (ses->ipc_tid == 0) { |
| 2762 | temp_unc = kmalloc(2 /* for slashes */ + |
| 2763 | strnlen(ses->serverName, SERVER_NAME_LEN_WITH_NULL * 2) |
| 2764 | + 1 + 4 /* slash IPC$ */ + 2, GFP_KERNEL); |
| 2765 | if (temp_unc == NULL) |
| 2766 | return -ENOMEM; |
| 2767 | temp_unc[0] = '\\'; |
| 2768 | temp_unc[1] = '\\'; |
| 2769 | strcpy(temp_unc + 2, ses->serverName); |
| 2770 | strcpy(temp_unc + 2 + strlen(ses->serverName), "\\IPC$"); |
| 2771 | rc = ses->server->ops->tree_connect(xid, ses, temp_unc, NULL, |
| 2772 | nls_codepage); |
| 2773 | cifs_dbg(FYI, "Tcon rc = %d ipc_tid = %d\n", rc, ses->ipc_tid); |
| 2774 | kfree(temp_unc); |
| 2775 | } |
| 2776 | if (rc == 0) |
| 2777 | rc = ses->server->ops->get_dfs_refer(xid, ses, old_path, |
| 2778 | referrals, num_referrals, |
| 2779 | nls_codepage, remap); |
| 2780 | /* |
| 2781 | * BB - map targetUNCs to dfs_info3 structures, here or in |
| 2782 | * ses->server->ops->get_dfs_refer. |
| 2783 | */ |
| 2784 | |
| 2785 | return rc; |
| 2786 | } |
| 2787 | |
| 2788 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
| 2789 | static struct lock_class_key cifs_key[2]; |
| 2790 | static struct lock_class_key cifs_slock_key[2]; |
| 2791 | |
| 2792 | static inline void |
| 2793 | cifs_reclassify_socket4(struct socket *sock) |
| 2794 | { |
| 2795 | struct sock *sk = sock->sk; |
| 2796 | BUG_ON(sock_owned_by_user(sk)); |
| 2797 | sock_lock_init_class_and_name(sk, "slock-AF_INET-CIFS", |
| 2798 | &cifs_slock_key[0], "sk_lock-AF_INET-CIFS", &cifs_key[0]); |
| 2799 | } |
| 2800 | |
| 2801 | static inline void |
| 2802 | cifs_reclassify_socket6(struct socket *sock) |
| 2803 | { |
| 2804 | struct sock *sk = sock->sk; |
| 2805 | BUG_ON(sock_owned_by_user(sk)); |
| 2806 | sock_lock_init_class_and_name(sk, "slock-AF_INET6-CIFS", |
| 2807 | &cifs_slock_key[1], "sk_lock-AF_INET6-CIFS", &cifs_key[1]); |
| 2808 | } |
| 2809 | #else |
| 2810 | static inline void |
| 2811 | cifs_reclassify_socket4(struct socket *sock) |
| 2812 | { |
| 2813 | } |
| 2814 | |
| 2815 | static inline void |
| 2816 | cifs_reclassify_socket6(struct socket *sock) |
| 2817 | { |
| 2818 | } |
| 2819 | #endif |
| 2820 | |
| 2821 | /* See RFC1001 section 14 on representation of Netbios names */ |
| 2822 | static void rfc1002mangle(char *target, char *source, unsigned int length) |
| 2823 | { |
| 2824 | unsigned int i, j; |
| 2825 | |
| 2826 | for (i = 0, j = 0; i < (length); i++) { |
| 2827 | /* mask a nibble at a time and encode */ |
| 2828 | target[j] = 'A' + (0x0F & (source[i] >> 4)); |
| 2829 | target[j+1] = 'A' + (0x0F & source[i]); |
| 2830 | j += 2; |
| 2831 | } |
| 2832 | |
| 2833 | } |
| 2834 | |
| 2835 | static int |
| 2836 | bind_socket(struct TCP_Server_Info *server) |
| 2837 | { |
| 2838 | int rc = 0; |
| 2839 | if (server->srcaddr.ss_family != AF_UNSPEC) { |
| 2840 | /* Bind to the specified local IP address */ |
| 2841 | struct socket *socket = server->ssocket; |
| 2842 | rc = socket->ops->bind(socket, |
| 2843 | (struct sockaddr *) &server->srcaddr, |
| 2844 | sizeof(server->srcaddr)); |
| 2845 | if (rc < 0) { |
| 2846 | struct sockaddr_in *saddr4; |
| 2847 | struct sockaddr_in6 *saddr6; |
| 2848 | saddr4 = (struct sockaddr_in *)&server->srcaddr; |
| 2849 | saddr6 = (struct sockaddr_in6 *)&server->srcaddr; |
| 2850 | if (saddr6->sin6_family == AF_INET6) |
| 2851 | cifs_dbg(VFS, "Failed to bind to: %pI6c, error: %d\n", |
| 2852 | &saddr6->sin6_addr, rc); |
| 2853 | else |
| 2854 | cifs_dbg(VFS, "Failed to bind to: %pI4, error: %d\n", |
| 2855 | &saddr4->sin_addr.s_addr, rc); |
| 2856 | } |
| 2857 | } |
| 2858 | return rc; |
| 2859 | } |
| 2860 | |
| 2861 | static int |
| 2862 | ip_rfc1001_connect(struct TCP_Server_Info *server) |
| 2863 | { |
| 2864 | int rc = 0; |
| 2865 | /* |
| 2866 | * some servers require RFC1001 sessinit before sending |
| 2867 | * negprot - BB check reconnection in case where second |
| 2868 | * sessinit is sent but no second negprot |
| 2869 | */ |
| 2870 | struct rfc1002_session_packet *ses_init_buf; |
| 2871 | struct smb_hdr *smb_buf; |
| 2872 | ses_init_buf = kzalloc(sizeof(struct rfc1002_session_packet), |
| 2873 | GFP_KERNEL); |
| 2874 | if (ses_init_buf) { |
| 2875 | ses_init_buf->trailer.session_req.called_len = 32; |
| 2876 | |
| 2877 | if (server->server_RFC1001_name && |
| 2878 | server->server_RFC1001_name[0] != 0) |
| 2879 | rfc1002mangle(ses_init_buf->trailer. |
| 2880 | session_req.called_name, |
| 2881 | server->server_RFC1001_name, |
| 2882 | RFC1001_NAME_LEN_WITH_NULL); |
| 2883 | else |
| 2884 | rfc1002mangle(ses_init_buf->trailer. |
| 2885 | session_req.called_name, |
| 2886 | DEFAULT_CIFS_CALLED_NAME, |
| 2887 | RFC1001_NAME_LEN_WITH_NULL); |
| 2888 | |
| 2889 | ses_init_buf->trailer.session_req.calling_len = 32; |
| 2890 | |
| 2891 | /* |
| 2892 | * calling name ends in null (byte 16) from old smb |
| 2893 | * convention. |
| 2894 | */ |
| 2895 | if (server->workstation_RFC1001_name && |
| 2896 | server->workstation_RFC1001_name[0] != 0) |
| 2897 | rfc1002mangle(ses_init_buf->trailer. |
| 2898 | session_req.calling_name, |
| 2899 | server->workstation_RFC1001_name, |
| 2900 | RFC1001_NAME_LEN_WITH_NULL); |
| 2901 | else |
| 2902 | rfc1002mangle(ses_init_buf->trailer. |
| 2903 | session_req.calling_name, |
| 2904 | "LINUX_CIFS_CLNT", |
| 2905 | RFC1001_NAME_LEN_WITH_NULL); |
| 2906 | |
| 2907 | ses_init_buf->trailer.session_req.scope1 = 0; |
| 2908 | ses_init_buf->trailer.session_req.scope2 = 0; |
| 2909 | smb_buf = (struct smb_hdr *)ses_init_buf; |
| 2910 | |
| 2911 | /* sizeof RFC1002_SESSION_REQUEST with no scope */ |
| 2912 | smb_buf->smb_buf_length = cpu_to_be32(0x81000044); |
| 2913 | rc = smb_send(server, smb_buf, 0x44); |
| 2914 | kfree(ses_init_buf); |
| 2915 | /* |
| 2916 | * RFC1001 layer in at least one server |
| 2917 | * requires very short break before negprot |
| 2918 | * presumably because not expecting negprot |
| 2919 | * to follow so fast. This is a simple |
| 2920 | * solution that works without |
| 2921 | * complicating the code and causes no |
| 2922 | * significant slowing down on mount |
| 2923 | * for everyone else |
| 2924 | */ |
| 2925 | usleep_range(1000, 2000); |
| 2926 | } |
| 2927 | /* |
| 2928 | * else the negprot may still work without this |
| 2929 | * even though malloc failed |
| 2930 | */ |
| 2931 | |
| 2932 | return rc; |
| 2933 | } |
| 2934 | |
| 2935 | static int |
| 2936 | generic_ip_connect(struct TCP_Server_Info *server) |
| 2937 | { |
| 2938 | int rc = 0; |
| 2939 | __be16 sport; |
| 2940 | int slen, sfamily; |
| 2941 | struct socket *socket = server->ssocket; |
| 2942 | struct sockaddr *saddr; |
| 2943 | |
| 2944 | saddr = (struct sockaddr *) &server->dstaddr; |
| 2945 | |
| 2946 | if (server->dstaddr.ss_family == AF_INET6) { |
| 2947 | sport = ((struct sockaddr_in6 *) saddr)->sin6_port; |
| 2948 | slen = sizeof(struct sockaddr_in6); |
| 2949 | sfamily = AF_INET6; |
| 2950 | } else { |
| 2951 | sport = ((struct sockaddr_in *) saddr)->sin_port; |
| 2952 | slen = sizeof(struct sockaddr_in); |
| 2953 | sfamily = AF_INET; |
| 2954 | } |
| 2955 | |
| 2956 | if (socket == NULL) { |
| 2957 | rc = __sock_create(cifs_net_ns(server), sfamily, SOCK_STREAM, |
| 2958 | IPPROTO_TCP, &socket, 1); |
| 2959 | if (rc < 0) { |
| 2960 | cifs_dbg(VFS, "Error %d creating socket\n", rc); |
| 2961 | server->ssocket = NULL; |
| 2962 | return rc; |
| 2963 | } |
| 2964 | |
| 2965 | /* BB other socket options to set KEEPALIVE, NODELAY? */ |
| 2966 | cifs_dbg(FYI, "Socket created\n"); |
| 2967 | server->ssocket = socket; |
| 2968 | socket->sk->sk_allocation = GFP_NOFS; |
| 2969 | if (sfamily == AF_INET6) |
| 2970 | cifs_reclassify_socket6(socket); |
| 2971 | else |
| 2972 | cifs_reclassify_socket4(socket); |
| 2973 | } |
| 2974 | |
| 2975 | rc = bind_socket(server); |
| 2976 | if (rc < 0) |
| 2977 | return rc; |
| 2978 | |
| 2979 | /* |
| 2980 | * Eventually check for other socket options to change from |
| 2981 | * the default. sock_setsockopt not used because it expects |
| 2982 | * user space buffer |
| 2983 | */ |
| 2984 | socket->sk->sk_rcvtimeo = 7 * HZ; |
| 2985 | socket->sk->sk_sndtimeo = 5 * HZ; |
| 2986 | |
| 2987 | /* make the bufsizes depend on wsize/rsize and max requests */ |
| 2988 | if (server->noautotune) { |
| 2989 | if (socket->sk->sk_sndbuf < (200 * 1024)) |
| 2990 | socket->sk->sk_sndbuf = 200 * 1024; |
| 2991 | if (socket->sk->sk_rcvbuf < (140 * 1024)) |
| 2992 | socket->sk->sk_rcvbuf = 140 * 1024; |
| 2993 | } |
| 2994 | |
| 2995 | if (server->tcp_nodelay) { |
| 2996 | int val = 1; |
| 2997 | rc = kernel_setsockopt(socket, SOL_TCP, TCP_NODELAY, |
| 2998 | (char *)&val, sizeof(val)); |
| 2999 | if (rc) |
| 3000 | cifs_dbg(FYI, "set TCP_NODELAY socket option error %d\n", |
| 3001 | rc); |
| 3002 | } |
| 3003 | |
| 3004 | cifs_dbg(FYI, "sndbuf %d rcvbuf %d rcvtimeo 0x%lx\n", |
| 3005 | socket->sk->sk_sndbuf, |
| 3006 | socket->sk->sk_rcvbuf, socket->sk->sk_rcvtimeo); |
| 3007 | |
| 3008 | rc = socket->ops->connect(socket, saddr, slen, 0); |
| 3009 | if (rc < 0) { |
| 3010 | cifs_dbg(FYI, "Error %d connecting to server\n", rc); |
| 3011 | sock_release(socket); |
| 3012 | server->ssocket = NULL; |
| 3013 | return rc; |
| 3014 | } |
| 3015 | |
| 3016 | if (sport == htons(RFC1001_PORT)) |
| 3017 | rc = ip_rfc1001_connect(server); |
| 3018 | |
| 3019 | return rc; |
| 3020 | } |
| 3021 | |
| 3022 | static int |
| 3023 | ip_connect(struct TCP_Server_Info *server) |
| 3024 | { |
| 3025 | __be16 *sport; |
| 3026 | struct sockaddr_in6 *addr6 = (struct sockaddr_in6 *)&server->dstaddr; |
| 3027 | struct sockaddr_in *addr = (struct sockaddr_in *)&server->dstaddr; |
| 3028 | |
| 3029 | if (server->dstaddr.ss_family == AF_INET6) |
| 3030 | sport = &addr6->sin6_port; |
| 3031 | else |
| 3032 | sport = &addr->sin_port; |
| 3033 | |
| 3034 | if (*sport == 0) { |
| 3035 | int rc; |
| 3036 | |
| 3037 | /* try with 445 port at first */ |
| 3038 | *sport = htons(CIFS_PORT); |
| 3039 | |
| 3040 | rc = generic_ip_connect(server); |
| 3041 | if (rc >= 0) |
| 3042 | return rc; |
| 3043 | |
| 3044 | /* if it failed, try with 139 port */ |
| 3045 | *sport = htons(RFC1001_PORT); |
| 3046 | } |
| 3047 | |
| 3048 | return generic_ip_connect(server); |
| 3049 | } |
| 3050 | |
| 3051 | void reset_cifs_unix_caps(unsigned int xid, struct cifs_tcon *tcon, |
| 3052 | struct cifs_sb_info *cifs_sb, struct smb_vol *vol_info) |
| 3053 | { |
| 3054 | /* if we are reconnecting then should we check to see if |
| 3055 | * any requested capabilities changed locally e.g. via |
| 3056 | * remount but we can not do much about it here |
| 3057 | * if they have (even if we could detect it by the following) |
| 3058 | * Perhaps we could add a backpointer to array of sb from tcon |
| 3059 | * or if we change to make all sb to same share the same |
| 3060 | * sb as NFS - then we only have one backpointer to sb. |
| 3061 | * What if we wanted to mount the server share twice once with |
| 3062 | * and once without posixacls or posix paths? */ |
| 3063 | __u64 saved_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); |
| 3064 | |
| 3065 | if (vol_info && vol_info->no_linux_ext) { |
| 3066 | tcon->fsUnixInfo.Capability = 0; |
| 3067 | tcon->unix_ext = 0; /* Unix Extensions disabled */ |
| 3068 | cifs_dbg(FYI, "Linux protocol extensions disabled\n"); |
| 3069 | return; |
| 3070 | } else if (vol_info) |
| 3071 | tcon->unix_ext = 1; /* Unix Extensions supported */ |
| 3072 | |
| 3073 | if (tcon->unix_ext == 0) { |
| 3074 | cifs_dbg(FYI, "Unix extensions disabled so not set on reconnect\n"); |
| 3075 | return; |
| 3076 | } |
| 3077 | |
| 3078 | if (!CIFSSMBQFSUnixInfo(xid, tcon)) { |
| 3079 | __u64 cap = le64_to_cpu(tcon->fsUnixInfo.Capability); |
| 3080 | cifs_dbg(FYI, "unix caps which server supports %lld\n", cap); |
| 3081 | /* check for reconnect case in which we do not |
| 3082 | want to change the mount behavior if we can avoid it */ |
| 3083 | if (vol_info == NULL) { |
| 3084 | /* turn off POSIX ACL and PATHNAMES if not set |
| 3085 | originally at mount time */ |
| 3086 | if ((saved_cap & CIFS_UNIX_POSIX_ACL_CAP) == 0) |
| 3087 | cap &= ~CIFS_UNIX_POSIX_ACL_CAP; |
| 3088 | if ((saved_cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { |
| 3089 | if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) |
| 3090 | cifs_dbg(VFS, "POSIXPATH support change\n"); |
| 3091 | cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; |
| 3092 | } else if ((cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) == 0) { |
| 3093 | cifs_dbg(VFS, "possible reconnect error\n"); |
| 3094 | cifs_dbg(VFS, "server disabled POSIX path support\n"); |
| 3095 | } |
| 3096 | } |
| 3097 | |
| 3098 | if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) |
| 3099 | cifs_dbg(VFS, "per-share encryption not supported yet\n"); |
| 3100 | |
| 3101 | cap &= CIFS_UNIX_CAP_MASK; |
| 3102 | if (vol_info && vol_info->no_psx_acl) |
| 3103 | cap &= ~CIFS_UNIX_POSIX_ACL_CAP; |
| 3104 | else if (CIFS_UNIX_POSIX_ACL_CAP & cap) { |
| 3105 | cifs_dbg(FYI, "negotiated posix acl support\n"); |
| 3106 | if (cifs_sb) |
| 3107 | cifs_sb->mnt_cifs_flags |= |
| 3108 | CIFS_MOUNT_POSIXACL; |
| 3109 | } |
| 3110 | |
| 3111 | if (vol_info && vol_info->posix_paths == 0) |
| 3112 | cap &= ~CIFS_UNIX_POSIX_PATHNAMES_CAP; |
| 3113 | else if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) { |
| 3114 | cifs_dbg(FYI, "negotiate posix pathnames\n"); |
| 3115 | if (cifs_sb) |
| 3116 | cifs_sb->mnt_cifs_flags |= |
| 3117 | CIFS_MOUNT_POSIX_PATHS; |
| 3118 | } |
| 3119 | |
| 3120 | cifs_dbg(FYI, "Negotiate caps 0x%x\n", (int)cap); |
| 3121 | #ifdef CONFIG_CIFS_DEBUG2 |
| 3122 | if (cap & CIFS_UNIX_FCNTL_CAP) |
| 3123 | cifs_dbg(FYI, "FCNTL cap\n"); |
| 3124 | if (cap & CIFS_UNIX_EXTATTR_CAP) |
| 3125 | cifs_dbg(FYI, "EXTATTR cap\n"); |
| 3126 | if (cap & CIFS_UNIX_POSIX_PATHNAMES_CAP) |
| 3127 | cifs_dbg(FYI, "POSIX path cap\n"); |
| 3128 | if (cap & CIFS_UNIX_XATTR_CAP) |
| 3129 | cifs_dbg(FYI, "XATTR cap\n"); |
| 3130 | if (cap & CIFS_UNIX_POSIX_ACL_CAP) |
| 3131 | cifs_dbg(FYI, "POSIX ACL cap\n"); |
| 3132 | if (cap & CIFS_UNIX_LARGE_READ_CAP) |
| 3133 | cifs_dbg(FYI, "very large read cap\n"); |
| 3134 | if (cap & CIFS_UNIX_LARGE_WRITE_CAP) |
| 3135 | cifs_dbg(FYI, "very large write cap\n"); |
| 3136 | if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_CAP) |
| 3137 | cifs_dbg(FYI, "transport encryption cap\n"); |
| 3138 | if (cap & CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP) |
| 3139 | cifs_dbg(FYI, "mandatory transport encryption cap\n"); |
| 3140 | #endif /* CIFS_DEBUG2 */ |
| 3141 | if (CIFSSMBSetFSUnixInfo(xid, tcon, cap)) { |
| 3142 | if (vol_info == NULL) { |
| 3143 | cifs_dbg(FYI, "resetting capabilities failed\n"); |
| 3144 | } else |
| 3145 | cifs_dbg(VFS, "Negotiating Unix capabilities with the server failed. Consider mounting with the Unix Extensions disabled if problems are found by specifying the nounix mount option.\n"); |
| 3146 | |
| 3147 | } |
| 3148 | } |
| 3149 | } |
| 3150 | |
| 3151 | void cifs_setup_cifs_sb(struct smb_vol *pvolume_info, |
| 3152 | struct cifs_sb_info *cifs_sb) |
| 3153 | { |
| 3154 | INIT_DELAYED_WORK(&cifs_sb->prune_tlinks, cifs_prune_tlinks); |
| 3155 | |
| 3156 | spin_lock_init(&cifs_sb->tlink_tree_lock); |
| 3157 | cifs_sb->tlink_tree = RB_ROOT; |
| 3158 | |
| 3159 | /* |
| 3160 | * Temporarily set r/wsize for matching superblock. If we end up using |
| 3161 | * new sb then client will later negotiate it downward if needed. |
| 3162 | */ |
| 3163 | cifs_sb->rsize = pvolume_info->rsize; |
| 3164 | cifs_sb->wsize = pvolume_info->wsize; |
| 3165 | |
| 3166 | cifs_sb->mnt_uid = pvolume_info->linux_uid; |
| 3167 | cifs_sb->mnt_gid = pvolume_info->linux_gid; |
| 3168 | cifs_sb->mnt_file_mode = pvolume_info->file_mode; |
| 3169 | cifs_sb->mnt_dir_mode = pvolume_info->dir_mode; |
| 3170 | cifs_dbg(FYI, "file mode: 0x%hx dir mode: 0x%hx\n", |
| 3171 | cifs_sb->mnt_file_mode, cifs_sb->mnt_dir_mode); |
| 3172 | |
| 3173 | cifs_sb->actimeo = pvolume_info->actimeo; |
| 3174 | cifs_sb->local_nls = pvolume_info->local_nls; |
| 3175 | |
| 3176 | if (pvolume_info->noperm) |
| 3177 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_PERM; |
| 3178 | if (pvolume_info->setuids) |
| 3179 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SET_UID; |
| 3180 | if (pvolume_info->server_ino) |
| 3181 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_SERVER_INUM; |
| 3182 | if (pvolume_info->remap) |
| 3183 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MAP_SPECIAL_CHR; |
| 3184 | if (pvolume_info->no_xattr) |
| 3185 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_XATTR; |
| 3186 | if (pvolume_info->sfu_emul) |
| 3187 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_UNX_EMUL; |
| 3188 | if (pvolume_info->nobrl) |
| 3189 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NO_BRL; |
| 3190 | if (pvolume_info->nostrictsync) |
| 3191 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOSSYNC; |
| 3192 | if (pvolume_info->mand_lock) |
| 3193 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_NOPOSIXBRL; |
| 3194 | if (pvolume_info->rwpidforward) |
| 3195 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_RWPIDFORWARD; |
| 3196 | if (pvolume_info->cifs_acl) |
| 3197 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_ACL; |
| 3198 | if (pvolume_info->backupuid_specified) { |
| 3199 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPUID; |
| 3200 | cifs_sb->mnt_backupuid = pvolume_info->backupuid; |
| 3201 | } |
| 3202 | if (pvolume_info->backupgid_specified) { |
| 3203 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_CIFS_BACKUPGID; |
| 3204 | cifs_sb->mnt_backupgid = pvolume_info->backupgid; |
| 3205 | } |
| 3206 | if (pvolume_info->override_uid) |
| 3207 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_UID; |
| 3208 | if (pvolume_info->override_gid) |
| 3209 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_OVERR_GID; |
| 3210 | if (pvolume_info->dynperm) |
| 3211 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DYNPERM; |
| 3212 | if (pvolume_info->fsc) |
| 3213 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_FSCACHE; |
| 3214 | if (pvolume_info->multiuser) |
| 3215 | cifs_sb->mnt_cifs_flags |= (CIFS_MOUNT_MULTIUSER | |
| 3216 | CIFS_MOUNT_NO_PERM); |
| 3217 | if (pvolume_info->strict_io) |
| 3218 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_STRICT_IO; |
| 3219 | if (pvolume_info->direct_io) { |
| 3220 | cifs_dbg(FYI, "mounting share using direct i/o\n"); |
| 3221 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_DIRECT_IO; |
| 3222 | } |
| 3223 | if (pvolume_info->mfsymlinks) { |
| 3224 | if (pvolume_info->sfu_emul) { |
| 3225 | cifs_dbg(VFS, "mount option mfsymlinks ignored if sfu mount option is used\n"); |
| 3226 | } else { |
| 3227 | cifs_sb->mnt_cifs_flags |= CIFS_MOUNT_MF_SYMLINKS; |
| 3228 | } |
| 3229 | } |
| 3230 | |
| 3231 | if ((pvolume_info->cifs_acl) && (pvolume_info->dynperm)) |
| 3232 | cifs_dbg(VFS, "mount option dynperm ignored if cifsacl mount option supported\n"); |
| 3233 | } |
| 3234 | |
| 3235 | static void |
| 3236 | cleanup_volume_info_contents(struct smb_vol *volume_info) |
| 3237 | { |
| 3238 | kfree(volume_info->username); |
| 3239 | kzfree(volume_info->password); |
| 3240 | kfree(volume_info->UNC); |
| 3241 | kfree(volume_info->domainname); |
| 3242 | kfree(volume_info->iocharset); |
| 3243 | kfree(volume_info->prepath); |
| 3244 | } |
| 3245 | |
| 3246 | void |
| 3247 | cifs_cleanup_volume_info(struct smb_vol *volume_info) |
| 3248 | { |
| 3249 | if (!volume_info) |
| 3250 | return; |
| 3251 | cleanup_volume_info_contents(volume_info); |
| 3252 | kfree(volume_info); |
| 3253 | } |
| 3254 | |
| 3255 | |
| 3256 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 3257 | /* |
| 3258 | * cifs_build_path_to_root returns full path to root when we do not have an |
| 3259 | * exiting connection (tcon) |
| 3260 | */ |
| 3261 | static char * |
| 3262 | build_unc_path_to_root(const struct smb_vol *vol, |
| 3263 | const struct cifs_sb_info *cifs_sb) |
| 3264 | { |
| 3265 | char *full_path, *pos; |
| 3266 | unsigned int pplen = vol->prepath ? strlen(vol->prepath) + 1 : 0; |
| 3267 | unsigned int unc_len = strnlen(vol->UNC, MAX_TREE_SIZE + 1); |
| 3268 | |
| 3269 | full_path = kmalloc(unc_len + pplen + 1, GFP_KERNEL); |
| 3270 | if (full_path == NULL) |
| 3271 | return ERR_PTR(-ENOMEM); |
| 3272 | |
| 3273 | strncpy(full_path, vol->UNC, unc_len); |
| 3274 | pos = full_path + unc_len; |
| 3275 | |
| 3276 | if (pplen) { |
| 3277 | *pos++ = CIFS_DIR_SEP(cifs_sb); |
| 3278 | strncpy(pos, vol->prepath, pplen); |
| 3279 | pos += pplen; |
| 3280 | } |
| 3281 | |
| 3282 | *pos = '\0'; /* add trailing null */ |
| 3283 | convert_delimiter(full_path, CIFS_DIR_SEP(cifs_sb)); |
| 3284 | cifs_dbg(FYI, "%s: full_path=%s\n", __func__, full_path); |
| 3285 | return full_path; |
| 3286 | } |
| 3287 | |
| 3288 | /* |
| 3289 | * Perform a dfs referral query for a share and (optionally) prefix |
| 3290 | * |
| 3291 | * If a referral is found, cifs_sb->mountdata will be (re-)allocated |
| 3292 | * to a string containing updated options for the submount. Otherwise it |
| 3293 | * will be left untouched. |
| 3294 | * |
| 3295 | * Returns the rc from get_dfs_path to the caller, which can be used to |
| 3296 | * determine whether there were referrals. |
| 3297 | */ |
| 3298 | static int |
| 3299 | expand_dfs_referral(const unsigned int xid, struct cifs_ses *ses, |
| 3300 | struct smb_vol *volume_info, struct cifs_sb_info *cifs_sb, |
| 3301 | int check_prefix) |
| 3302 | { |
| 3303 | int rc; |
| 3304 | unsigned int num_referrals = 0; |
| 3305 | struct dfs_info3_param *referrals = NULL; |
| 3306 | char *full_path = NULL, *ref_path = NULL, *mdata = NULL; |
| 3307 | |
| 3308 | full_path = build_unc_path_to_root(volume_info, cifs_sb); |
| 3309 | if (IS_ERR(full_path)) |
| 3310 | return PTR_ERR(full_path); |
| 3311 | |
| 3312 | /* For DFS paths, skip the first '\' of the UNC */ |
| 3313 | ref_path = check_prefix ? full_path + 1 : volume_info->UNC + 1; |
| 3314 | |
| 3315 | rc = get_dfs_path(xid, ses, ref_path, cifs_sb->local_nls, |
| 3316 | &num_referrals, &referrals, |
| 3317 | cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR); |
| 3318 | |
| 3319 | if (!rc && num_referrals > 0) { |
| 3320 | char *fake_devname = NULL; |
| 3321 | |
| 3322 | mdata = cifs_compose_mount_options(cifs_sb->mountdata, |
| 3323 | full_path + 1, referrals, |
| 3324 | &fake_devname); |
| 3325 | |
| 3326 | free_dfs_info_array(referrals, num_referrals); |
| 3327 | |
| 3328 | if (IS_ERR(mdata)) { |
| 3329 | rc = PTR_ERR(mdata); |
| 3330 | mdata = NULL; |
| 3331 | } else { |
| 3332 | cleanup_volume_info_contents(volume_info); |
| 3333 | rc = cifs_setup_volume_info(volume_info, mdata, |
| 3334 | fake_devname); |
| 3335 | } |
| 3336 | kfree(fake_devname); |
| 3337 | kfree(cifs_sb->mountdata); |
| 3338 | cifs_sb->mountdata = mdata; |
| 3339 | } |
| 3340 | kfree(full_path); |
| 3341 | return rc; |
| 3342 | } |
| 3343 | #endif |
| 3344 | |
| 3345 | static int |
| 3346 | cifs_setup_volume_info(struct smb_vol *volume_info, char *mount_data, |
| 3347 | const char *devname) |
| 3348 | { |
| 3349 | int rc = 0; |
| 3350 | |
| 3351 | if (cifs_parse_mount_options(mount_data, devname, volume_info)) |
| 3352 | return -EINVAL; |
| 3353 | |
| 3354 | if (volume_info->nullauth) { |
| 3355 | cifs_dbg(FYI, "Anonymous login\n"); |
| 3356 | kfree(volume_info->username); |
| 3357 | volume_info->username = NULL; |
| 3358 | } else if (volume_info->username) { |
| 3359 | /* BB fixme parse for domain name here */ |
| 3360 | cifs_dbg(FYI, "Username: %s\n", volume_info->username); |
| 3361 | } else { |
| 3362 | cifs_dbg(VFS, "No username specified\n"); |
| 3363 | /* In userspace mount helper we can get user name from alternate |
| 3364 | locations such as env variables and files on disk */ |
| 3365 | return -EINVAL; |
| 3366 | } |
| 3367 | |
| 3368 | /* this is needed for ASCII cp to Unicode converts */ |
| 3369 | if (volume_info->iocharset == NULL) { |
| 3370 | /* load_nls_default cannot return null */ |
| 3371 | volume_info->local_nls = load_nls_default(); |
| 3372 | } else { |
| 3373 | volume_info->local_nls = load_nls(volume_info->iocharset); |
| 3374 | if (volume_info->local_nls == NULL) { |
| 3375 | cifs_dbg(VFS, "CIFS mount error: iocharset %s not found\n", |
| 3376 | volume_info->iocharset); |
| 3377 | return -ELIBACC; |
| 3378 | } |
| 3379 | } |
| 3380 | |
| 3381 | return rc; |
| 3382 | } |
| 3383 | |
| 3384 | struct smb_vol * |
| 3385 | cifs_get_volume_info(char *mount_data, const char *devname) |
| 3386 | { |
| 3387 | int rc; |
| 3388 | struct smb_vol *volume_info; |
| 3389 | |
| 3390 | volume_info = kmalloc(sizeof(struct smb_vol), GFP_KERNEL); |
| 3391 | if (!volume_info) |
| 3392 | return ERR_PTR(-ENOMEM); |
| 3393 | |
| 3394 | rc = cifs_setup_volume_info(volume_info, mount_data, devname); |
| 3395 | if (rc) { |
| 3396 | cifs_cleanup_volume_info(volume_info); |
| 3397 | volume_info = ERR_PTR(rc); |
| 3398 | } |
| 3399 | |
| 3400 | return volume_info; |
| 3401 | } |
| 3402 | |
| 3403 | int |
| 3404 | cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info) |
| 3405 | { |
| 3406 | int rc; |
| 3407 | unsigned int xid; |
| 3408 | struct cifs_ses *ses; |
| 3409 | struct cifs_tcon *tcon; |
| 3410 | struct TCP_Server_Info *server; |
| 3411 | char *full_path; |
| 3412 | struct tcon_link *tlink; |
| 3413 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 3414 | int referral_walks_count = 0; |
| 3415 | #endif |
| 3416 | |
| 3417 | rc = bdi_setup_and_register(&cifs_sb->bdi, "cifs", BDI_CAP_MAP_COPY); |
| 3418 | if (rc) |
| 3419 | return rc; |
| 3420 | |
| 3421 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 3422 | try_mount_again: |
| 3423 | /* cleanup activities if we're chasing a referral */ |
| 3424 | if (referral_walks_count) { |
| 3425 | if (tcon) |
| 3426 | cifs_put_tcon(tcon); |
| 3427 | else if (ses) |
| 3428 | cifs_put_smb_ses(ses); |
| 3429 | |
| 3430 | free_xid(xid); |
| 3431 | } |
| 3432 | #endif |
| 3433 | rc = 0; |
| 3434 | tcon = NULL; |
| 3435 | ses = NULL; |
| 3436 | server = NULL; |
| 3437 | full_path = NULL; |
| 3438 | tlink = NULL; |
| 3439 | |
| 3440 | xid = get_xid(); |
| 3441 | |
| 3442 | /* get a reference to a tcp session */ |
| 3443 | server = cifs_get_tcp_session(volume_info); |
| 3444 | if (IS_ERR(server)) { |
| 3445 | rc = PTR_ERR(server); |
| 3446 | bdi_destroy(&cifs_sb->bdi); |
| 3447 | goto out; |
| 3448 | } |
| 3449 | |
| 3450 | /* get a reference to a SMB session */ |
| 3451 | ses = cifs_get_smb_ses(server, volume_info); |
| 3452 | if (IS_ERR(ses)) { |
| 3453 | rc = PTR_ERR(ses); |
| 3454 | ses = NULL; |
| 3455 | goto mount_fail_check; |
| 3456 | } |
| 3457 | |
| 3458 | /* search for existing tcon to this server share */ |
| 3459 | tcon = cifs_get_tcon(ses, volume_info); |
| 3460 | if (IS_ERR(tcon)) { |
| 3461 | rc = PTR_ERR(tcon); |
| 3462 | tcon = NULL; |
| 3463 | goto remote_path_check; |
| 3464 | } |
| 3465 | |
| 3466 | /* tell server which Unix caps we support */ |
| 3467 | if (cap_unix(tcon->ses)) { |
| 3468 | /* reset of caps checks mount to see if unix extensions |
| 3469 | disabled for just this mount */ |
| 3470 | reset_cifs_unix_caps(xid, tcon, cifs_sb, volume_info); |
| 3471 | if ((tcon->ses->server->tcpStatus == CifsNeedReconnect) && |
| 3472 | (le64_to_cpu(tcon->fsUnixInfo.Capability) & |
| 3473 | CIFS_UNIX_TRANSPORT_ENCRYPTION_MANDATORY_CAP)) { |
| 3474 | rc = -EACCES; |
| 3475 | goto mount_fail_check; |
| 3476 | } |
| 3477 | } else |
| 3478 | tcon->unix_ext = 0; /* server does not support them */ |
| 3479 | |
| 3480 | /* do not care if a following call succeed - informational */ |
| 3481 | if (!tcon->ipc && server->ops->qfs_tcon) |
| 3482 | server->ops->qfs_tcon(xid, tcon); |
| 3483 | |
| 3484 | cifs_sb->wsize = server->ops->negotiate_wsize(tcon, volume_info); |
| 3485 | cifs_sb->rsize = server->ops->negotiate_rsize(tcon, volume_info); |
| 3486 | |
| 3487 | /* tune readahead according to rsize */ |
| 3488 | cifs_sb->bdi.ra_pages = cifs_sb->rsize / PAGE_CACHE_SIZE; |
| 3489 | |
| 3490 | remote_path_check: |
| 3491 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 3492 | /* |
| 3493 | * Perform an unconditional check for whether there are DFS |
| 3494 | * referrals for this path without prefix, to provide support |
| 3495 | * for DFS referrals from w2k8 servers which don't seem to respond |
| 3496 | * with PATH_NOT_COVERED to requests that include the prefix. |
| 3497 | * Chase the referral if found, otherwise continue normally. |
| 3498 | */ |
| 3499 | if (referral_walks_count == 0) { |
| 3500 | int refrc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, |
| 3501 | false); |
| 3502 | if (!refrc) { |
| 3503 | referral_walks_count++; |
| 3504 | goto try_mount_again; |
| 3505 | } |
| 3506 | } |
| 3507 | #endif |
| 3508 | |
| 3509 | /* check if a whole path is not remote */ |
| 3510 | if (!rc && tcon) { |
| 3511 | if (!server->ops->is_path_accessible) { |
| 3512 | rc = -ENOSYS; |
| 3513 | goto mount_fail_check; |
| 3514 | } |
| 3515 | /* |
| 3516 | * cifs_build_path_to_root works only when we have a valid tcon |
| 3517 | */ |
| 3518 | full_path = cifs_build_path_to_root(volume_info, cifs_sb, tcon); |
| 3519 | if (full_path == NULL) { |
| 3520 | rc = -ENOMEM; |
| 3521 | goto mount_fail_check; |
| 3522 | } |
| 3523 | rc = server->ops->is_path_accessible(xid, tcon, cifs_sb, |
| 3524 | full_path); |
| 3525 | if (rc != 0 && rc != -EREMOTE) { |
| 3526 | kfree(full_path); |
| 3527 | goto mount_fail_check; |
| 3528 | } |
| 3529 | kfree(full_path); |
| 3530 | } |
| 3531 | |
| 3532 | /* get referral if needed */ |
| 3533 | if (rc == -EREMOTE) { |
| 3534 | #ifdef CONFIG_CIFS_DFS_UPCALL |
| 3535 | if (referral_walks_count > MAX_NESTED_LINKS) { |
| 3536 | /* |
| 3537 | * BB: when we implement proper loop detection, |
| 3538 | * we will remove this check. But now we need it |
| 3539 | * to prevent an indefinite loop if 'DFS tree' is |
| 3540 | * misconfigured (i.e. has loops). |
| 3541 | */ |
| 3542 | rc = -ELOOP; |
| 3543 | goto mount_fail_check; |
| 3544 | } |
| 3545 | |
| 3546 | rc = expand_dfs_referral(xid, ses, volume_info, cifs_sb, true); |
| 3547 | |
| 3548 | if (!rc) { |
| 3549 | referral_walks_count++; |
| 3550 | goto try_mount_again; |
| 3551 | } |
| 3552 | goto mount_fail_check; |
| 3553 | #else /* No DFS support, return error on mount */ |
| 3554 | rc = -EOPNOTSUPP; |
| 3555 | #endif |
| 3556 | } |
| 3557 | |
| 3558 | if (rc) |
| 3559 | goto mount_fail_check; |
| 3560 | |
| 3561 | /* now, hang the tcon off of the superblock */ |
| 3562 | tlink = kzalloc(sizeof *tlink, GFP_KERNEL); |
| 3563 | if (tlink == NULL) { |
| 3564 | rc = -ENOMEM; |
| 3565 | goto mount_fail_check; |
| 3566 | } |
| 3567 | |
| 3568 | tlink->tl_uid = ses->linux_uid; |
| 3569 | tlink->tl_tcon = tcon; |
| 3570 | tlink->tl_time = jiffies; |
| 3571 | set_bit(TCON_LINK_MASTER, &tlink->tl_flags); |
| 3572 | set_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); |
| 3573 | |
| 3574 | cifs_sb->master_tlink = tlink; |
| 3575 | spin_lock(&cifs_sb->tlink_tree_lock); |
| 3576 | tlink_rb_insert(&cifs_sb->tlink_tree, tlink); |
| 3577 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 3578 | |
| 3579 | queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks, |
| 3580 | TLINK_IDLE_EXPIRE); |
| 3581 | |
| 3582 | mount_fail_check: |
| 3583 | /* on error free sesinfo and tcon struct if needed */ |
| 3584 | if (rc) { |
| 3585 | /* If find_unc succeeded then rc == 0 so we can not end */ |
| 3586 | /* up accidentally freeing someone elses tcon struct */ |
| 3587 | if (tcon) |
| 3588 | cifs_put_tcon(tcon); |
| 3589 | else if (ses) |
| 3590 | cifs_put_smb_ses(ses); |
| 3591 | else |
| 3592 | cifs_put_tcp_session(server); |
| 3593 | bdi_destroy(&cifs_sb->bdi); |
| 3594 | } |
| 3595 | |
| 3596 | out: |
| 3597 | free_xid(xid); |
| 3598 | return rc; |
| 3599 | } |
| 3600 | |
| 3601 | /* |
| 3602 | * Issue a TREE_CONNECT request. Note that for IPC$ shares, that the tcon |
| 3603 | * pointer may be NULL. |
| 3604 | */ |
| 3605 | int |
| 3606 | CIFSTCon(const unsigned int xid, struct cifs_ses *ses, |
| 3607 | const char *tree, struct cifs_tcon *tcon, |
| 3608 | const struct nls_table *nls_codepage) |
| 3609 | { |
| 3610 | struct smb_hdr *smb_buffer; |
| 3611 | struct smb_hdr *smb_buffer_response; |
| 3612 | TCONX_REQ *pSMB; |
| 3613 | TCONX_RSP *pSMBr; |
| 3614 | unsigned char *bcc_ptr; |
| 3615 | int rc = 0; |
| 3616 | int length; |
| 3617 | __u16 bytes_left, count; |
| 3618 | |
| 3619 | if (ses == NULL) |
| 3620 | return -EIO; |
| 3621 | |
| 3622 | smb_buffer = cifs_buf_get(); |
| 3623 | if (smb_buffer == NULL) |
| 3624 | return -ENOMEM; |
| 3625 | |
| 3626 | smb_buffer_response = smb_buffer; |
| 3627 | |
| 3628 | header_assemble(smb_buffer, SMB_COM_TREE_CONNECT_ANDX, |
| 3629 | NULL /*no tid */ , 4 /*wct */ ); |
| 3630 | |
| 3631 | smb_buffer->Mid = get_next_mid(ses->server); |
| 3632 | smb_buffer->Uid = ses->Suid; |
| 3633 | pSMB = (TCONX_REQ *) smb_buffer; |
| 3634 | pSMBr = (TCONX_RSP *) smb_buffer_response; |
| 3635 | |
| 3636 | pSMB->AndXCommand = 0xFF; |
| 3637 | pSMB->Flags = cpu_to_le16(TCON_EXTENDED_SECINFO); |
| 3638 | bcc_ptr = &pSMB->Password[0]; |
| 3639 | if (!tcon || (ses->server->sec_mode & SECMODE_USER)) { |
| 3640 | pSMB->PasswordLength = cpu_to_le16(1); /* minimum */ |
| 3641 | *bcc_ptr = 0; /* password is null byte */ |
| 3642 | bcc_ptr++; /* skip password */ |
| 3643 | /* already aligned so no need to do it below */ |
| 3644 | } else { |
| 3645 | pSMB->PasswordLength = cpu_to_le16(CIFS_AUTH_RESP_SIZE); |
| 3646 | /* BB FIXME add code to fail this if NTLMv2 or Kerberos |
| 3647 | specified as required (when that support is added to |
| 3648 | the vfs in the future) as only NTLM or the much |
| 3649 | weaker LANMAN (which we do not send by default) is accepted |
| 3650 | by Samba (not sure whether other servers allow |
| 3651 | NTLMv2 password here) */ |
| 3652 | #ifdef CONFIG_CIFS_WEAK_PW_HASH |
| 3653 | if ((global_secflags & CIFSSEC_MAY_LANMAN) && |
| 3654 | (ses->server->secType == LANMAN)) |
| 3655 | calc_lanman_hash(tcon->password, ses->server->cryptkey, |
| 3656 | ses->server->sec_mode & |
| 3657 | SECMODE_PW_ENCRYPT ? true : false, |
| 3658 | bcc_ptr); |
| 3659 | else |
| 3660 | #endif /* CIFS_WEAK_PW_HASH */ |
| 3661 | rc = SMBNTencrypt(tcon->password, ses->server->cryptkey, |
| 3662 | bcc_ptr, nls_codepage); |
| 3663 | |
| 3664 | bcc_ptr += CIFS_AUTH_RESP_SIZE; |
| 3665 | if (ses->capabilities & CAP_UNICODE) { |
| 3666 | /* must align unicode strings */ |
| 3667 | *bcc_ptr = 0; /* null byte password */ |
| 3668 | bcc_ptr++; |
| 3669 | } |
| 3670 | } |
| 3671 | |
| 3672 | if (ses->server->sec_mode & |
| 3673 | (SECMODE_SIGN_REQUIRED | SECMODE_SIGN_ENABLED)) |
| 3674 | smb_buffer->Flags2 |= SMBFLG2_SECURITY_SIGNATURE; |
| 3675 | |
| 3676 | if (ses->capabilities & CAP_STATUS32) { |
| 3677 | smb_buffer->Flags2 |= SMBFLG2_ERR_STATUS; |
| 3678 | } |
| 3679 | if (ses->capabilities & CAP_DFS) { |
| 3680 | smb_buffer->Flags2 |= SMBFLG2_DFS; |
| 3681 | } |
| 3682 | if (ses->capabilities & CAP_UNICODE) { |
| 3683 | smb_buffer->Flags2 |= SMBFLG2_UNICODE; |
| 3684 | length = |
| 3685 | cifs_strtoUTF16((__le16 *) bcc_ptr, tree, |
| 3686 | 6 /* max utf8 char length in bytes */ * |
| 3687 | (/* server len*/ + 256 /* share len */), nls_codepage); |
| 3688 | bcc_ptr += 2 * length; /* convert num 16 bit words to bytes */ |
| 3689 | bcc_ptr += 2; /* skip trailing null */ |
| 3690 | } else { /* ASCII */ |
| 3691 | strcpy(bcc_ptr, tree); |
| 3692 | bcc_ptr += strlen(tree) + 1; |
| 3693 | } |
| 3694 | strcpy(bcc_ptr, "?????"); |
| 3695 | bcc_ptr += strlen("?????"); |
| 3696 | bcc_ptr += 1; |
| 3697 | count = bcc_ptr - &pSMB->Password[0]; |
| 3698 | pSMB->hdr.smb_buf_length = cpu_to_be32(be32_to_cpu( |
| 3699 | pSMB->hdr.smb_buf_length) + count); |
| 3700 | pSMB->ByteCount = cpu_to_le16(count); |
| 3701 | |
| 3702 | rc = SendReceive(xid, ses, smb_buffer, smb_buffer_response, &length, |
| 3703 | 0); |
| 3704 | |
| 3705 | /* above now done in SendReceive */ |
| 3706 | if ((rc == 0) && (tcon != NULL)) { |
| 3707 | bool is_unicode; |
| 3708 | |
| 3709 | tcon->tidStatus = CifsGood; |
| 3710 | tcon->need_reconnect = false; |
| 3711 | tcon->tid = smb_buffer_response->Tid; |
| 3712 | bcc_ptr = pByteArea(smb_buffer_response); |
| 3713 | bytes_left = get_bcc(smb_buffer_response); |
| 3714 | length = strnlen(bcc_ptr, bytes_left - 2); |
| 3715 | if (smb_buffer->Flags2 & SMBFLG2_UNICODE) |
| 3716 | is_unicode = true; |
| 3717 | else |
| 3718 | is_unicode = false; |
| 3719 | |
| 3720 | |
| 3721 | /* skip service field (NB: this field is always ASCII) */ |
| 3722 | if (length == 3) { |
| 3723 | if ((bcc_ptr[0] == 'I') && (bcc_ptr[1] == 'P') && |
| 3724 | (bcc_ptr[2] == 'C')) { |
| 3725 | cifs_dbg(FYI, "IPC connection\n"); |
| 3726 | tcon->ipc = 1; |
| 3727 | } |
| 3728 | } else if (length == 2) { |
| 3729 | if ((bcc_ptr[0] == 'A') && (bcc_ptr[1] == ':')) { |
| 3730 | /* the most common case */ |
| 3731 | cifs_dbg(FYI, "disk share connection\n"); |
| 3732 | } |
| 3733 | } |
| 3734 | bcc_ptr += length + 1; |
| 3735 | bytes_left -= (length + 1); |
| 3736 | strncpy(tcon->treeName, tree, MAX_TREE_SIZE); |
| 3737 | |
| 3738 | /* mostly informational -- no need to fail on error here */ |
| 3739 | kfree(tcon->nativeFileSystem); |
| 3740 | tcon->nativeFileSystem = cifs_strndup_from_utf16(bcc_ptr, |
| 3741 | bytes_left, is_unicode, |
| 3742 | nls_codepage); |
| 3743 | |
| 3744 | cifs_dbg(FYI, "nativeFileSystem=%s\n", tcon->nativeFileSystem); |
| 3745 | |
| 3746 | if ((smb_buffer_response->WordCount == 3) || |
| 3747 | (smb_buffer_response->WordCount == 7)) |
| 3748 | /* field is in same location */ |
| 3749 | tcon->Flags = le16_to_cpu(pSMBr->OptionalSupport); |
| 3750 | else |
| 3751 | tcon->Flags = 0; |
| 3752 | cifs_dbg(FYI, "Tcon flags: 0x%x\n", tcon->Flags); |
| 3753 | } else if ((rc == 0) && tcon == NULL) { |
| 3754 | /* all we need to save for IPC$ connection */ |
| 3755 | ses->ipc_tid = smb_buffer_response->Tid; |
| 3756 | } |
| 3757 | |
| 3758 | cifs_buf_release(smb_buffer); |
| 3759 | return rc; |
| 3760 | } |
| 3761 | |
| 3762 | void |
| 3763 | cifs_umount(struct cifs_sb_info *cifs_sb) |
| 3764 | { |
| 3765 | struct rb_root *root = &cifs_sb->tlink_tree; |
| 3766 | struct rb_node *node; |
| 3767 | struct tcon_link *tlink; |
| 3768 | |
| 3769 | cancel_delayed_work_sync(&cifs_sb->prune_tlinks); |
| 3770 | |
| 3771 | spin_lock(&cifs_sb->tlink_tree_lock); |
| 3772 | while ((node = rb_first(root))) { |
| 3773 | tlink = rb_entry(node, struct tcon_link, tl_rbnode); |
| 3774 | cifs_get_tlink(tlink); |
| 3775 | clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); |
| 3776 | rb_erase(node, root); |
| 3777 | |
| 3778 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 3779 | cifs_put_tlink(tlink); |
| 3780 | spin_lock(&cifs_sb->tlink_tree_lock); |
| 3781 | } |
| 3782 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 3783 | |
| 3784 | bdi_destroy(&cifs_sb->bdi); |
| 3785 | kfree(cifs_sb->mountdata); |
| 3786 | unload_nls(cifs_sb->local_nls); |
| 3787 | kfree(cifs_sb); |
| 3788 | } |
| 3789 | |
| 3790 | int |
| 3791 | cifs_negotiate_protocol(const unsigned int xid, struct cifs_ses *ses) |
| 3792 | { |
| 3793 | int rc = 0; |
| 3794 | struct TCP_Server_Info *server = ses->server; |
| 3795 | |
| 3796 | if (!server->ops->need_neg || !server->ops->negotiate) |
| 3797 | return -ENOSYS; |
| 3798 | |
| 3799 | /* only send once per connect */ |
| 3800 | if (!server->ops->need_neg(server)) |
| 3801 | return 0; |
| 3802 | |
| 3803 | set_credits(server, 1); |
| 3804 | |
| 3805 | rc = server->ops->negotiate(xid, ses); |
| 3806 | if (rc == 0) { |
| 3807 | spin_lock(&GlobalMid_Lock); |
| 3808 | if (server->tcpStatus == CifsNeedNegotiate) |
| 3809 | server->tcpStatus = CifsGood; |
| 3810 | else |
| 3811 | rc = -EHOSTDOWN; |
| 3812 | spin_unlock(&GlobalMid_Lock); |
| 3813 | } |
| 3814 | |
| 3815 | return rc; |
| 3816 | } |
| 3817 | |
| 3818 | int |
| 3819 | cifs_setup_session(const unsigned int xid, struct cifs_ses *ses, |
| 3820 | struct nls_table *nls_info) |
| 3821 | { |
| 3822 | int rc = -ENOSYS; |
| 3823 | struct TCP_Server_Info *server = ses->server; |
| 3824 | |
| 3825 | ses->flags = 0; |
| 3826 | ses->capabilities = server->capabilities; |
| 3827 | if (linuxExtEnabled == 0) |
| 3828 | ses->capabilities &= (~server->vals->cap_unix); |
| 3829 | |
| 3830 | cifs_dbg(FYI, "Security Mode: 0x%x Capabilities: 0x%x TimeAdjust: %d\n", |
| 3831 | server->sec_mode, server->capabilities, server->timeAdj); |
| 3832 | |
| 3833 | if (server->ops->sess_setup) |
| 3834 | rc = server->ops->sess_setup(xid, ses, nls_info); |
| 3835 | |
| 3836 | if (rc) { |
| 3837 | cifs_dbg(VFS, "Send error in SessSetup = %d\n", rc); |
| 3838 | } else { |
| 3839 | mutex_lock(&server->srv_mutex); |
| 3840 | if (!server->session_estab) { |
| 3841 | server->session_key.response = ses->auth_key.response; |
| 3842 | server->session_key.len = ses->auth_key.len; |
| 3843 | server->sequence_number = 0x2; |
| 3844 | server->session_estab = true; |
| 3845 | ses->auth_key.response = NULL; |
| 3846 | } |
| 3847 | mutex_unlock(&server->srv_mutex); |
| 3848 | |
| 3849 | cifs_dbg(FYI, "CIFS Session Established successfully\n"); |
| 3850 | spin_lock(&GlobalMid_Lock); |
| 3851 | ses->status = CifsGood; |
| 3852 | ses->need_reconnect = false; |
| 3853 | spin_unlock(&GlobalMid_Lock); |
| 3854 | } |
| 3855 | |
| 3856 | kfree(ses->auth_key.response); |
| 3857 | ses->auth_key.response = NULL; |
| 3858 | ses->auth_key.len = 0; |
| 3859 | kfree(ses->ntlmssp); |
| 3860 | ses->ntlmssp = NULL; |
| 3861 | |
| 3862 | return rc; |
| 3863 | } |
| 3864 | |
| 3865 | static int |
| 3866 | cifs_set_vol_auth(struct smb_vol *vol, struct cifs_ses *ses) |
| 3867 | { |
| 3868 | switch (ses->server->secType) { |
| 3869 | case Kerberos: |
| 3870 | vol->secFlg = CIFSSEC_MUST_KRB5; |
| 3871 | return 0; |
| 3872 | case NTLMv2: |
| 3873 | vol->secFlg = CIFSSEC_MUST_NTLMV2; |
| 3874 | break; |
| 3875 | case NTLM: |
| 3876 | vol->secFlg = CIFSSEC_MUST_NTLM; |
| 3877 | break; |
| 3878 | case RawNTLMSSP: |
| 3879 | vol->secFlg = CIFSSEC_MUST_NTLMSSP; |
| 3880 | break; |
| 3881 | case LANMAN: |
| 3882 | vol->secFlg = CIFSSEC_MUST_LANMAN; |
| 3883 | break; |
| 3884 | } |
| 3885 | |
| 3886 | return cifs_set_cifscreds(vol, ses); |
| 3887 | } |
| 3888 | |
| 3889 | static struct cifs_tcon * |
| 3890 | cifs_construct_tcon(struct cifs_sb_info *cifs_sb, kuid_t fsuid) |
| 3891 | { |
| 3892 | int rc; |
| 3893 | struct cifs_tcon *master_tcon = cifs_sb_master_tcon(cifs_sb); |
| 3894 | struct cifs_ses *ses; |
| 3895 | struct cifs_tcon *tcon = NULL; |
| 3896 | struct smb_vol *vol_info; |
| 3897 | |
| 3898 | vol_info = kzalloc(sizeof(*vol_info), GFP_KERNEL); |
| 3899 | if (vol_info == NULL) |
| 3900 | return ERR_PTR(-ENOMEM); |
| 3901 | |
| 3902 | vol_info->local_nls = cifs_sb->local_nls; |
| 3903 | vol_info->linux_uid = fsuid; |
| 3904 | vol_info->cred_uid = fsuid; |
| 3905 | vol_info->UNC = master_tcon->treeName; |
| 3906 | vol_info->retry = master_tcon->retry; |
| 3907 | vol_info->nocase = master_tcon->nocase; |
| 3908 | vol_info->local_lease = master_tcon->local_lease; |
| 3909 | vol_info->no_linux_ext = !master_tcon->unix_ext; |
| 3910 | |
| 3911 | rc = cifs_set_vol_auth(vol_info, master_tcon->ses); |
| 3912 | if (rc) { |
| 3913 | tcon = ERR_PTR(rc); |
| 3914 | goto out; |
| 3915 | } |
| 3916 | |
| 3917 | /* get a reference for the same TCP session */ |
| 3918 | spin_lock(&cifs_tcp_ses_lock); |
| 3919 | ++master_tcon->ses->server->srv_count; |
| 3920 | spin_unlock(&cifs_tcp_ses_lock); |
| 3921 | |
| 3922 | ses = cifs_get_smb_ses(master_tcon->ses->server, vol_info); |
| 3923 | if (IS_ERR(ses)) { |
| 3924 | tcon = (struct cifs_tcon *)ses; |
| 3925 | cifs_put_tcp_session(master_tcon->ses->server); |
| 3926 | goto out; |
| 3927 | } |
| 3928 | |
| 3929 | tcon = cifs_get_tcon(ses, vol_info); |
| 3930 | if (IS_ERR(tcon)) { |
| 3931 | cifs_put_smb_ses(ses); |
| 3932 | goto out; |
| 3933 | } |
| 3934 | |
| 3935 | if (cap_unix(ses)) |
| 3936 | reset_cifs_unix_caps(0, tcon, NULL, vol_info); |
| 3937 | out: |
| 3938 | kfree(vol_info->username); |
| 3939 | kfree(vol_info->password); |
| 3940 | kfree(vol_info); |
| 3941 | |
| 3942 | return tcon; |
| 3943 | } |
| 3944 | |
| 3945 | struct cifs_tcon * |
| 3946 | cifs_sb_master_tcon(struct cifs_sb_info *cifs_sb) |
| 3947 | { |
| 3948 | return tlink_tcon(cifs_sb_master_tlink(cifs_sb)); |
| 3949 | } |
| 3950 | |
| 3951 | static int |
| 3952 | cifs_sb_tcon_pending_wait(void *unused) |
| 3953 | { |
| 3954 | schedule(); |
| 3955 | return signal_pending(current) ? -ERESTARTSYS : 0; |
| 3956 | } |
| 3957 | |
| 3958 | /* find and return a tlink with given uid */ |
| 3959 | static struct tcon_link * |
| 3960 | tlink_rb_search(struct rb_root *root, kuid_t uid) |
| 3961 | { |
| 3962 | struct rb_node *node = root->rb_node; |
| 3963 | struct tcon_link *tlink; |
| 3964 | |
| 3965 | while (node) { |
| 3966 | tlink = rb_entry(node, struct tcon_link, tl_rbnode); |
| 3967 | |
| 3968 | if (uid_gt(tlink->tl_uid, uid)) |
| 3969 | node = node->rb_left; |
| 3970 | else if (uid_lt(tlink->tl_uid, uid)) |
| 3971 | node = node->rb_right; |
| 3972 | else |
| 3973 | return tlink; |
| 3974 | } |
| 3975 | return NULL; |
| 3976 | } |
| 3977 | |
| 3978 | /* insert a tcon_link into the tree */ |
| 3979 | static void |
| 3980 | tlink_rb_insert(struct rb_root *root, struct tcon_link *new_tlink) |
| 3981 | { |
| 3982 | struct rb_node **new = &(root->rb_node), *parent = NULL; |
| 3983 | struct tcon_link *tlink; |
| 3984 | |
| 3985 | while (*new) { |
| 3986 | tlink = rb_entry(*new, struct tcon_link, tl_rbnode); |
| 3987 | parent = *new; |
| 3988 | |
| 3989 | if (uid_gt(tlink->tl_uid, new_tlink->tl_uid)) |
| 3990 | new = &((*new)->rb_left); |
| 3991 | else |
| 3992 | new = &((*new)->rb_right); |
| 3993 | } |
| 3994 | |
| 3995 | rb_link_node(&new_tlink->tl_rbnode, parent, new); |
| 3996 | rb_insert_color(&new_tlink->tl_rbnode, root); |
| 3997 | } |
| 3998 | |
| 3999 | /* |
| 4000 | * Find or construct an appropriate tcon given a cifs_sb and the fsuid of the |
| 4001 | * current task. |
| 4002 | * |
| 4003 | * If the superblock doesn't refer to a multiuser mount, then just return |
| 4004 | * the master tcon for the mount. |
| 4005 | * |
| 4006 | * First, search the rbtree for an existing tcon for this fsuid. If one |
| 4007 | * exists, then check to see if it's pending construction. If it is then wait |
| 4008 | * for construction to complete. Once it's no longer pending, check to see if |
| 4009 | * it failed and either return an error or retry construction, depending on |
| 4010 | * the timeout. |
| 4011 | * |
| 4012 | * If one doesn't exist then insert a new tcon_link struct into the tree and |
| 4013 | * try to construct a new one. |
| 4014 | */ |
| 4015 | struct tcon_link * |
| 4016 | cifs_sb_tlink(struct cifs_sb_info *cifs_sb) |
| 4017 | { |
| 4018 | int ret; |
| 4019 | kuid_t fsuid = current_fsuid(); |
| 4020 | struct tcon_link *tlink, *newtlink; |
| 4021 | |
| 4022 | if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MULTIUSER)) |
| 4023 | return cifs_get_tlink(cifs_sb_master_tlink(cifs_sb)); |
| 4024 | |
| 4025 | spin_lock(&cifs_sb->tlink_tree_lock); |
| 4026 | tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid); |
| 4027 | if (tlink) |
| 4028 | cifs_get_tlink(tlink); |
| 4029 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 4030 | |
| 4031 | if (tlink == NULL) { |
| 4032 | newtlink = kzalloc(sizeof(*tlink), GFP_KERNEL); |
| 4033 | if (newtlink == NULL) |
| 4034 | return ERR_PTR(-ENOMEM); |
| 4035 | newtlink->tl_uid = fsuid; |
| 4036 | newtlink->tl_tcon = ERR_PTR(-EACCES); |
| 4037 | set_bit(TCON_LINK_PENDING, &newtlink->tl_flags); |
| 4038 | set_bit(TCON_LINK_IN_TREE, &newtlink->tl_flags); |
| 4039 | cifs_get_tlink(newtlink); |
| 4040 | |
| 4041 | spin_lock(&cifs_sb->tlink_tree_lock); |
| 4042 | /* was one inserted after previous search? */ |
| 4043 | tlink = tlink_rb_search(&cifs_sb->tlink_tree, fsuid); |
| 4044 | if (tlink) { |
| 4045 | cifs_get_tlink(tlink); |
| 4046 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 4047 | kfree(newtlink); |
| 4048 | goto wait_for_construction; |
| 4049 | } |
| 4050 | tlink = newtlink; |
| 4051 | tlink_rb_insert(&cifs_sb->tlink_tree, tlink); |
| 4052 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 4053 | } else { |
| 4054 | wait_for_construction: |
| 4055 | ret = wait_on_bit(&tlink->tl_flags, TCON_LINK_PENDING, |
| 4056 | cifs_sb_tcon_pending_wait, |
| 4057 | TASK_INTERRUPTIBLE); |
| 4058 | if (ret) { |
| 4059 | cifs_put_tlink(tlink); |
| 4060 | return ERR_PTR(ret); |
| 4061 | } |
| 4062 | |
| 4063 | /* if it's good, return it */ |
| 4064 | if (!IS_ERR(tlink->tl_tcon)) |
| 4065 | return tlink; |
| 4066 | |
| 4067 | /* return error if we tried this already recently */ |
| 4068 | if (time_before(jiffies, tlink->tl_time + TLINK_ERROR_EXPIRE)) { |
| 4069 | cifs_put_tlink(tlink); |
| 4070 | return ERR_PTR(-EACCES); |
| 4071 | } |
| 4072 | |
| 4073 | if (test_and_set_bit(TCON_LINK_PENDING, &tlink->tl_flags)) |
| 4074 | goto wait_for_construction; |
| 4075 | } |
| 4076 | |
| 4077 | tlink->tl_tcon = cifs_construct_tcon(cifs_sb, fsuid); |
| 4078 | clear_bit(TCON_LINK_PENDING, &tlink->tl_flags); |
| 4079 | wake_up_bit(&tlink->tl_flags, TCON_LINK_PENDING); |
| 4080 | |
| 4081 | if (IS_ERR(tlink->tl_tcon)) { |
| 4082 | cifs_put_tlink(tlink); |
| 4083 | return ERR_PTR(-EACCES); |
| 4084 | } |
| 4085 | |
| 4086 | return tlink; |
| 4087 | } |
| 4088 | |
| 4089 | /* |
| 4090 | * periodic workqueue job that scans tcon_tree for a superblock and closes |
| 4091 | * out tcons. |
| 4092 | */ |
| 4093 | static void |
| 4094 | cifs_prune_tlinks(struct work_struct *work) |
| 4095 | { |
| 4096 | struct cifs_sb_info *cifs_sb = container_of(work, struct cifs_sb_info, |
| 4097 | prune_tlinks.work); |
| 4098 | struct rb_root *root = &cifs_sb->tlink_tree; |
| 4099 | struct rb_node *node = rb_first(root); |
| 4100 | struct rb_node *tmp; |
| 4101 | struct tcon_link *tlink; |
| 4102 | |
| 4103 | /* |
| 4104 | * Because we drop the spinlock in the loop in order to put the tlink |
| 4105 | * it's not guarded against removal of links from the tree. The only |
| 4106 | * places that remove entries from the tree are this function and |
| 4107 | * umounts. Because this function is non-reentrant and is canceled |
| 4108 | * before umount can proceed, this is safe. |
| 4109 | */ |
| 4110 | spin_lock(&cifs_sb->tlink_tree_lock); |
| 4111 | node = rb_first(root); |
| 4112 | while (node != NULL) { |
| 4113 | tmp = node; |
| 4114 | node = rb_next(tmp); |
| 4115 | tlink = rb_entry(tmp, struct tcon_link, tl_rbnode); |
| 4116 | |
| 4117 | if (test_bit(TCON_LINK_MASTER, &tlink->tl_flags) || |
| 4118 | atomic_read(&tlink->tl_count) != 0 || |
| 4119 | time_after(tlink->tl_time + TLINK_IDLE_EXPIRE, jiffies)) |
| 4120 | continue; |
| 4121 | |
| 4122 | cifs_get_tlink(tlink); |
| 4123 | clear_bit(TCON_LINK_IN_TREE, &tlink->tl_flags); |
| 4124 | rb_erase(tmp, root); |
| 4125 | |
| 4126 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 4127 | cifs_put_tlink(tlink); |
| 4128 | spin_lock(&cifs_sb->tlink_tree_lock); |
| 4129 | } |
| 4130 | spin_unlock(&cifs_sb->tlink_tree_lock); |
| 4131 | |
| 4132 | queue_delayed_work(cifsiod_wq, &cifs_sb->prune_tlinks, |
| 4133 | TLINK_IDLE_EXPIRE); |
| 4134 | } |