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1// SPDX-License-Identifier: GPL-2.0-only2/*3 * SMB1 (CIFS) version specific operations4 *5 * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com>6 */7 8#include <linux/pagemap.h>9#include <linux/vfs.h>10#include <uapi/linux/magic.h>11#include "cifsglob.h"12#include "cifsproto.h"13#include "cifs_debug.h"14#include "cifspdu.h"15#include "cifs_unicode.h"16#include "fs_context.h"17 18/*19 * An NT cancel request header looks just like the original request except:20 *21 * The Command is SMB_COM_NT_CANCEL22 * The WordCount is zeroed out23 * The ByteCount is zeroed out24 *25 * This function mangles an existing request buffer into a26 * SMB_COM_NT_CANCEL request and then sends it.27 */28static int29send_nt_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst,30 struct mid_q_entry *mid)31{32 int rc = 0;33 struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base;34 35 /* -4 for RFC1001 length and +2 for BCC field */36 in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2);37 in_buf->Command = SMB_COM_NT_CANCEL;38 in_buf->WordCount = 0;39 put_bcc(0, in_buf);40 41 cifs_server_lock(server);42 rc = cifs_sign_smb(in_buf, server, &mid->sequence_number);43 if (rc) {44 cifs_server_unlock(server);45 return rc;46 }47 48 /*49 * The response to this call was already factored into the sequence50 * number when the call went out, so we must adjust it back downward51 * after signing here.52 */53 --server->sequence_number;54 rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length));55 if (rc < 0)56 server->sequence_number--;57 58 cifs_server_unlock(server);59 60 cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n",61 get_mid(in_buf), rc);62 63 return rc;64}65 66static bool67cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2)68{69 return ob1->fid.netfid == ob2->fid.netfid;70}71 72static unsigned int73cifs_read_data_offset(char *buf)74{75 READ_RSP *rsp = (READ_RSP *)buf;76 return le16_to_cpu(rsp->DataOffset);77}78 79static unsigned int80cifs_read_data_length(char *buf, bool in_remaining)81{82 READ_RSP *rsp = (READ_RSP *)buf;83 /* It's a bug reading remaining data for SMB1 packets */84 WARN_ON(in_remaining);85 return (le16_to_cpu(rsp->DataLengthHigh) << 16) +86 le16_to_cpu(rsp->DataLength);87}88 89static struct mid_q_entry *90cifs_find_mid(struct TCP_Server_Info *server, char *buffer)91{92 struct smb_hdr *buf = (struct smb_hdr *)buffer;93 struct mid_q_entry *mid;94 95 spin_lock(&server->mid_lock);96 list_for_each_entry(mid, &server->pending_mid_q, qhead) {97 if (compare_mid(mid->mid, buf) &&98 mid->mid_state == MID_REQUEST_SUBMITTED &&99 le16_to_cpu(mid->command) == buf->Command) {100 kref_get(&mid->refcount);101 spin_unlock(&server->mid_lock);102 return mid;103 }104 }105 spin_unlock(&server->mid_lock);106 return NULL;107}108 109static void110cifs_add_credits(struct TCP_Server_Info *server,111 struct cifs_credits *credits, const int optype)112{113 spin_lock(&server->req_lock);114 server->credits += credits->value;115 server->in_flight--;116 spin_unlock(&server->req_lock);117 wake_up(&server->request_q);118}119 120static void121cifs_set_credits(struct TCP_Server_Info *server, const int val)122{123 spin_lock(&server->req_lock);124 server->credits = val;125 server->oplocks = val > 1 ? enable_oplocks : false;126 spin_unlock(&server->req_lock);127}128 129static int *130cifs_get_credits_field(struct TCP_Server_Info *server, const int optype)131{132 return &server->credits;133}134 135static unsigned int136cifs_get_credits(struct mid_q_entry *mid)137{138 return 1;139}140 141/*142 * Find a free multiplex id (SMB mid). Otherwise there could be143 * mid collisions which might cause problems, demultiplexing the144 * wrong response to this request. Multiplex ids could collide if145 * one of a series requests takes much longer than the others, or146 * if a very large number of long lived requests (byte range147 * locks or FindNotify requests) are pending. No more than148 * 64K-1 requests can be outstanding at one time. If no149 * mids are available, return zero. A future optimization150 * could make the combination of mids and uid the key we use151 * to demultiplex on (rather than mid alone).152 * In addition to the above check, the cifs demultiplex153 * code already used the command code as a secondary154 * check of the frame and if signing is negotiated the155 * response would be discarded if the mid were the same156 * but the signature was wrong. Since the mid is not put in the157 * pending queue until later (when it is about to be dispatched)158 * we do have to limit the number of outstanding requests159 * to somewhat less than 64K-1 although it is hard to imagine160 * so many threads being in the vfs at one time.161 */162static __u64163cifs_get_next_mid(struct TCP_Server_Info *server)164{165 __u64 mid = 0;166 __u16 last_mid, cur_mid;167 bool collision, reconnect = false;168 169 spin_lock(&server->mid_lock);170 171 /* mid is 16 bit only for CIFS/SMB */172 cur_mid = (__u16)((server->CurrentMid) & 0xffff);173 /* we do not want to loop forever */174 last_mid = cur_mid;175 cur_mid++;176 /* avoid 0xFFFF MID */177 if (cur_mid == 0xffff)178 cur_mid++;179 180 /*181 * This nested loop looks more expensive than it is.182 * In practice the list of pending requests is short,183 * fewer than 50, and the mids are likely to be unique184 * on the first pass through the loop unless some request185 * takes longer than the 64 thousand requests before it186 * (and it would also have to have been a request that187 * did not time out).188 */189 while (cur_mid != last_mid) {190 struct mid_q_entry *mid_entry;191 unsigned int num_mids;192 193 collision = false;194 if (cur_mid == 0)195 cur_mid++;196 197 num_mids = 0;198 list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) {199 ++num_mids;200 if (mid_entry->mid == cur_mid &&201 mid_entry->mid_state == MID_REQUEST_SUBMITTED) {202 /* This mid is in use, try a different one */203 collision = true;204 break;205 }206 }207 208 /*209 * if we have more than 32k mids in the list, then something210 * is very wrong. Possibly a local user is trying to DoS the211 * box by issuing long-running calls and SIGKILL'ing them. If212 * we get to 2^16 mids then we're in big trouble as this213 * function could loop forever.214 *215 * Go ahead and assign out the mid in this situation, but force216 * an eventual reconnect to clean out the pending_mid_q.217 */218 if (num_mids > 32768)219 reconnect = true;220 221 if (!collision) {222 mid = (__u64)cur_mid;223 server->CurrentMid = mid;224 break;225 }226 cur_mid++;227 }228 spin_unlock(&server->mid_lock);229 230 if (reconnect) {231 cifs_signal_cifsd_for_reconnect(server, false);232 }233 234 return mid;235}236 237/*238 return codes:239 0 not a transact2, or all data present240 >0 transact2 with that much data missing241 -EINVAL invalid transact2242 */243static int244check2ndT2(char *buf)245{246 struct smb_hdr *pSMB = (struct smb_hdr *)buf;247 struct smb_t2_rsp *pSMBt;248 int remaining;249 __u16 total_data_size, data_in_this_rsp;250 251 if (pSMB->Command != SMB_COM_TRANSACTION2)252 return 0;253 254 /* check for plausible wct, bcc and t2 data and parm sizes */255 /* check for parm and data offset going beyond end of smb */256 if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */257 cifs_dbg(FYI, "Invalid transact2 word count\n");258 return -EINVAL;259 }260 261 pSMBt = (struct smb_t2_rsp *)pSMB;262 263 total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);264 data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);265 266 if (total_data_size == data_in_this_rsp)267 return 0;268 else if (total_data_size < data_in_this_rsp) {269 cifs_dbg(FYI, "total data %d smaller than data in frame %d\n",270 total_data_size, data_in_this_rsp);271 return -EINVAL;272 }273 274 remaining = total_data_size - data_in_this_rsp;275 276 cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n",277 remaining);278 if (total_data_size > CIFSMaxBufSize) {279 cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n",280 total_data_size, CIFSMaxBufSize);281 return -EINVAL;282 }283 return remaining;284}285 286static int287coalesce_t2(char *second_buf, struct smb_hdr *target_hdr)288{289 struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf;290 struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr;291 char *data_area_of_tgt;292 char *data_area_of_src;293 int remaining;294 unsigned int byte_count, total_in_tgt;295 __u16 tgt_total_cnt, src_total_cnt, total_in_src;296 297 src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount);298 tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount);299 300 if (tgt_total_cnt != src_total_cnt)301 cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n",302 src_total_cnt, tgt_total_cnt);303 304 total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount);305 306 remaining = tgt_total_cnt - total_in_tgt;307 308 if (remaining < 0) {309 cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n",310 tgt_total_cnt, total_in_tgt);311 return -EPROTO;312 }313 314 if (remaining == 0) {315 /* nothing to do, ignore */316 cifs_dbg(FYI, "no more data remains\n");317 return 0;318 }319 320 total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount);321 if (remaining < total_in_src)322 cifs_dbg(FYI, "transact2 2nd response contains too much data\n");323 324 /* find end of first SMB data area */325 data_area_of_tgt = (char *)&pSMBt->hdr.Protocol +326 get_unaligned_le16(&pSMBt->t2_rsp.DataOffset);327 328 /* validate target area */329 data_area_of_src = (char *)&pSMBs->hdr.Protocol +330 get_unaligned_le16(&pSMBs->t2_rsp.DataOffset);331 332 data_area_of_tgt += total_in_tgt;333 334 total_in_tgt += total_in_src;335 /* is the result too big for the field? */336 if (total_in_tgt > USHRT_MAX) {337 cifs_dbg(FYI, "coalesced DataCount too large (%u)\n",338 total_in_tgt);339 return -EPROTO;340 }341 put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount);342 343 /* fix up the BCC */344 byte_count = get_bcc(target_hdr);345 byte_count += total_in_src;346 /* is the result too big for the field? */347 if (byte_count > USHRT_MAX) {348 cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count);349 return -EPROTO;350 }351 put_bcc(byte_count, target_hdr);352 353 byte_count = be32_to_cpu(target_hdr->smb_buf_length);354 byte_count += total_in_src;355 /* don't allow buffer to overflow */356 if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) {357 cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n",358 byte_count);359 return -ENOBUFS;360 }361 target_hdr->smb_buf_length = cpu_to_be32(byte_count);362 363 /* copy second buffer into end of first buffer */364 memcpy(data_area_of_tgt, data_area_of_src, total_in_src);365 366 if (remaining != total_in_src) {367 /* more responses to go */368 cifs_dbg(FYI, "waiting for more secondary responses\n");369 return 1;370 }371 372 /* we are done */373 cifs_dbg(FYI, "found the last secondary response\n");374 return 0;375}376 377static void378cifs_downgrade_oplock(struct TCP_Server_Info *server,379 struct cifsInodeInfo *cinode, __u32 oplock,380 unsigned int epoch, bool *purge_cache)381{382 cifs_set_oplock_level(cinode, oplock);383}384 385static bool386cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server,387 char *buf, int malformed)388{389 if (malformed)390 return false;391 if (check2ndT2(buf) <= 0)392 return false;393 mid->multiRsp = true;394 if (mid->resp_buf) {395 /* merge response - fix up 1st*/396 malformed = coalesce_t2(buf, mid->resp_buf);397 if (malformed > 0)398 return true;399 /* All parts received or packet is malformed. */400 mid->multiEnd = true;401 dequeue_mid(mid, malformed);402 return true;403 }404 if (!server->large_buf) {405 /*FIXME: switch to already allocated largebuf?*/406 cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n");407 } else {408 /* Have first buffer */409 mid->resp_buf = buf;410 mid->large_buf = true;411 server->bigbuf = NULL;412 }413 return true;414}415 416static bool417cifs_need_neg(struct TCP_Server_Info *server)418{419 return server->maxBuf == 0;420}421 422static int423cifs_negotiate(const unsigned int xid,424 struct cifs_ses *ses,425 struct TCP_Server_Info *server)426{427 int rc;428 rc = CIFSSMBNegotiate(xid, ses, server);429 if (rc == -EAGAIN) {430 /* retry only once on 1st time connection */431 set_credits(server, 1);432 rc = CIFSSMBNegotiate(xid, ses, server);433 if (rc == -EAGAIN)434 rc = -EHOSTDOWN;435 }436 return rc;437}438 439static unsigned int440cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)441{442 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);443 struct TCP_Server_Info *server = tcon->ses->server;444 unsigned int wsize;445 446 /* start with specified wsize, or default */447 if (ctx->wsize)448 wsize = ctx->wsize;449 else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))450 wsize = CIFS_DEFAULT_IOSIZE;451 else452 wsize = CIFS_DEFAULT_NON_POSIX_WSIZE;453 454 /* can server support 24-bit write sizes? (via UNIX extensions) */455 if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP))456 wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE);457 458 /*459 * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set?460 * Limit it to max buffer offered by the server, minus the size of the461 * WRITEX header, not including the 4 byte RFC1001 length.462 */463 if (!(server->capabilities & CAP_LARGE_WRITE_X) ||464 (!(server->capabilities & CAP_UNIX) && server->sign))465 wsize = min_t(unsigned int, wsize,466 server->maxBuf - sizeof(WRITE_REQ) + 4);467 468 /* hard limit of CIFS_MAX_WSIZE */469 wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE);470 471 return wsize;472}473 474static unsigned int475cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx)476{477 __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability);478 struct TCP_Server_Info *server = tcon->ses->server;479 unsigned int rsize, defsize;480 481 /*482 * Set default value...483 *484 * HACK alert! Ancient servers have very small buffers. Even though485 * MS-CIFS indicates that servers are only limited by the client's486 * bufsize for reads, testing against win98se shows that it throws487 * INVALID_PARAMETER errors if you try to request too large a read.488 * OS/2 just sends back short reads.489 *490 * If the server doesn't advertise CAP_LARGE_READ_X, then assume that491 * it can't handle a read request larger than its MaxBufferSize either.492 */493 if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP))494 defsize = CIFS_DEFAULT_IOSIZE;495 else if (server->capabilities & CAP_LARGE_READ_X)496 defsize = CIFS_DEFAULT_NON_POSIX_RSIZE;497 else498 defsize = server->maxBuf - sizeof(READ_RSP);499 500 rsize = ctx->rsize ? ctx->rsize : defsize;501 502 /*503 * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to504 * the client's MaxBufferSize.505 */506 if (!(server->capabilities & CAP_LARGE_READ_X))507 rsize = min_t(unsigned int, CIFSMaxBufSize, rsize);508 509 /* hard limit of CIFS_MAX_RSIZE */510 rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE);511 512 return rsize;513}514 515static void516cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon,517 struct cifs_sb_info *cifs_sb)518{519 CIFSSMBQFSDeviceInfo(xid, tcon);520 CIFSSMBQFSAttributeInfo(xid, tcon);521}522 523static int524cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon,525 struct cifs_sb_info *cifs_sb, const char *full_path)526{527 int rc;528 FILE_ALL_INFO *file_info;529 530 file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL);531 if (file_info == NULL)532 return -ENOMEM;533 534 rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info,535 0 /* not legacy */, cifs_sb->local_nls,536 cifs_remap(cifs_sb));537 538 if (rc == -EOPNOTSUPP || rc == -EINVAL)539 rc = SMBQueryInformation(xid, tcon, full_path, file_info,540 cifs_sb->local_nls, cifs_remap(cifs_sb));541 kfree(file_info);542 return rc;543}544 545static int cifs_query_path_info(const unsigned int xid,546 struct cifs_tcon *tcon,547 struct cifs_sb_info *cifs_sb,548 const char *full_path,549 struct cifs_open_info_data *data)550{551 int rc;552 FILE_ALL_INFO fi = {};553 554 data->symlink = false;555 data->adjust_tz = false;556 557 /* could do find first instead but this returns more info */558 rc = CIFSSMBQPathInfo(xid, tcon, full_path, &fi, 0 /* not legacy */, cifs_sb->local_nls,559 cifs_remap(cifs_sb));560 /*561 * BB optimize code so we do not make the above call when server claims562 * no NT SMB support and the above call failed at least once - set flag563 * in tcon or mount.564 */565 if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) {566 rc = SMBQueryInformation(xid, tcon, full_path, &fi, cifs_sb->local_nls,567 cifs_remap(cifs_sb));568 data->adjust_tz = true;569 }570 571 if (!rc) {572 int tmprc;573 int oplock = 0;574 struct cifs_fid fid;575 struct cifs_open_parms oparms;576 577 move_cifs_info_to_smb2(&data->fi, &fi);578 579 if (!(le32_to_cpu(fi.Attributes) & ATTR_REPARSE))580 return 0;581 582 oparms = (struct cifs_open_parms) {583 .tcon = tcon,584 .cifs_sb = cifs_sb,585 .desired_access = FILE_READ_ATTRIBUTES,586 .create_options = cifs_create_options(cifs_sb, 0),587 .disposition = FILE_OPEN,588 .path = full_path,589 .fid = &fid,590 };591 592 /* Need to check if this is a symbolic link or not */593 tmprc = CIFS_open(xid, &oparms, &oplock, NULL);594 if (tmprc == -EOPNOTSUPP)595 data->symlink = true;596 else if (tmprc == 0)597 CIFSSMBClose(xid, tcon, fid.netfid);598 }599 600 return rc;601}602 603static int cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon,604 struct cifs_sb_info *cifs_sb, const char *full_path,605 u64 *uniqueid, struct cifs_open_info_data *unused)606{607 /*608 * We can not use the IndexNumber field by default from Windows or609 * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA610 * CIFS spec claims that this value is unique within the scope of a611 * share, and the windows docs hint that it's actually unique612 * per-machine.613 *614 * There may be higher info levels that work but are there Windows615 * server or network appliances for which IndexNumber field is not616 * guaranteed unique?617 */618 return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid,619 cifs_sb->local_nls,620 cifs_remap(cifs_sb));621}622 623static int cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon,624 struct cifsFileInfo *cfile, struct cifs_open_info_data *data)625{626 int rc;627 FILE_ALL_INFO fi = {};628 629 if (cfile->symlink_target) {630 data->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL);631 if (!data->symlink_target)632 return -ENOMEM;633 }634 635 rc = CIFSSMBQFileInfo(xid, tcon, cfile->fid.netfid, &fi);636 if (!rc)637 move_cifs_info_to_smb2(&data->fi, &fi);638 return rc;639}640 641static void642cifs_clear_stats(struct cifs_tcon *tcon)643{644 atomic_set(&tcon->stats.cifs_stats.num_writes, 0);645 atomic_set(&tcon->stats.cifs_stats.num_reads, 0);646 atomic_set(&tcon->stats.cifs_stats.num_flushes, 0);647 atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0);648 atomic_set(&tcon->stats.cifs_stats.num_opens, 0);649 atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0);650 atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0);651 atomic_set(&tcon->stats.cifs_stats.num_closes, 0);652 atomic_set(&tcon->stats.cifs_stats.num_deletes, 0);653 atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0);654 atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0);655 atomic_set(&tcon->stats.cifs_stats.num_renames, 0);656 atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0);657 atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0);658 atomic_set(&tcon->stats.cifs_stats.num_fnext, 0);659 atomic_set(&tcon->stats.cifs_stats.num_fclose, 0);660 atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0);661 atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0);662 atomic_set(&tcon->stats.cifs_stats.num_locks, 0);663 atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0);664 atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0);665}666 667static void668cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon)669{670 seq_printf(m, " Oplocks breaks: %d",671 atomic_read(&tcon->stats.cifs_stats.num_oplock_brks));672 seq_printf(m, "\nReads: %d Bytes: %llu",673 atomic_read(&tcon->stats.cifs_stats.num_reads),674 (long long)(tcon->bytes_read));675 seq_printf(m, "\nWrites: %d Bytes: %llu",676 atomic_read(&tcon->stats.cifs_stats.num_writes),677 (long long)(tcon->bytes_written));678 seq_printf(m, "\nFlushes: %d",679 atomic_read(&tcon->stats.cifs_stats.num_flushes));680 seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d",681 atomic_read(&tcon->stats.cifs_stats.num_locks),682 atomic_read(&tcon->stats.cifs_stats.num_hardlinks),683 atomic_read(&tcon->stats.cifs_stats.num_symlinks));684 seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d",685 atomic_read(&tcon->stats.cifs_stats.num_opens),686 atomic_read(&tcon->stats.cifs_stats.num_closes),687 atomic_read(&tcon->stats.cifs_stats.num_deletes));688 seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d",689 atomic_read(&tcon->stats.cifs_stats.num_posixopens),690 atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs));691 seq_printf(m, "\nMkdirs: %d Rmdirs: %d",692 atomic_read(&tcon->stats.cifs_stats.num_mkdirs),693 atomic_read(&tcon->stats.cifs_stats.num_rmdirs));694 seq_printf(m, "\nRenames: %d T2 Renames %d",695 atomic_read(&tcon->stats.cifs_stats.num_renames),696 atomic_read(&tcon->stats.cifs_stats.num_t2renames));697 seq_printf(m, "\nFindFirst: %d FNext %d FClose %d",698 atomic_read(&tcon->stats.cifs_stats.num_ffirst),699 atomic_read(&tcon->stats.cifs_stats.num_fnext),700 atomic_read(&tcon->stats.cifs_stats.num_fclose));701}702 703static void704cifs_mkdir_setinfo(struct inode *inode, const char *full_path,705 struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon,706 const unsigned int xid)707{708 FILE_BASIC_INFO info;709 struct cifsInodeInfo *cifsInode;710 u32 dosattrs;711 int rc;712 713 memset(&info, 0, sizeof(info));714 cifsInode = CIFS_I(inode);715 dosattrs = cifsInode->cifsAttrs|ATTR_READONLY;716 info.Attributes = cpu_to_le32(dosattrs);717 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls,718 cifs_sb);719 if (rc == 0)720 cifsInode->cifsAttrs = dosattrs;721}722 723static int cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock,724 void *buf)725{726 struct cifs_open_info_data *data = buf;727 FILE_ALL_INFO fi = {};728 int rc;729 730 if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS))731 rc = SMBLegacyOpen(xid, oparms->tcon, oparms->path,732 oparms->disposition,733 oparms->desired_access,734 oparms->create_options,735 &oparms->fid->netfid, oplock, &fi,736 oparms->cifs_sb->local_nls,737 cifs_remap(oparms->cifs_sb));738 else739 rc = CIFS_open(xid, oparms, oplock, &fi);740 741 if (!rc && data)742 move_cifs_info_to_smb2(&data->fi, &fi);743 744 return rc;745}746 747static void748cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock)749{750 struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));751 cfile->fid.netfid = fid->netfid;752 cifs_set_oplock_level(cinode, oplock);753 cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode);754}755 756static int757cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon,758 struct cifs_fid *fid)759{760 return CIFSSMBClose(xid, tcon, fid->netfid);761}762 763static int764cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon,765 struct cifs_fid *fid)766{767 return CIFSSMBFlush(xid, tcon, fid->netfid);768}769 770static int771cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid,772 struct cifs_io_parms *parms, unsigned int *bytes_read,773 char **buf, int *buf_type)774{775 parms->netfid = pfid->netfid;776 return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type);777}778 779static int780cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid,781 struct cifs_io_parms *parms, unsigned int *written,782 struct kvec *iov, unsigned long nr_segs)783{784 785 parms->netfid = pfid->netfid;786 return CIFSSMBWrite2(xid, parms, written, iov, nr_segs);787}788 789static int790smb_set_file_info(struct inode *inode, const char *full_path,791 FILE_BASIC_INFO *buf, const unsigned int xid)792{793 int oplock = 0;794 int rc;795 __u32 netpid;796 struct cifs_fid fid;797 struct cifs_open_parms oparms;798 struct cifsFileInfo *open_file;799 struct cifsInodeInfo *cinode = CIFS_I(inode);800 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);801 struct tcon_link *tlink = NULL;802 struct cifs_tcon *tcon;803 804 /* if the file is already open for write, just use that fileid */805 open_file = find_writable_file(cinode, FIND_WR_FSUID_ONLY);806 if (open_file) {807 fid.netfid = open_file->fid.netfid;808 netpid = open_file->pid;809 tcon = tlink_tcon(open_file->tlink);810 goto set_via_filehandle;811 }812 813 tlink = cifs_sb_tlink(cifs_sb);814 if (IS_ERR(tlink)) {815 rc = PTR_ERR(tlink);816 tlink = NULL;817 goto out;818 }819 tcon = tlink_tcon(tlink);820 821 rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls,822 cifs_sb);823 if (rc == 0) {824 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);825 goto out;826 } else if (rc != -EOPNOTSUPP && rc != -EINVAL) {827 goto out;828 }829 830 oparms = (struct cifs_open_parms) {831 .tcon = tcon,832 .cifs_sb = cifs_sb,833 .desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES,834 .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR),835 .disposition = FILE_OPEN,836 .path = full_path,837 .fid = &fid,838 };839 840 cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n");841 rc = CIFS_open(xid, &oparms, &oplock, NULL);842 if (rc != 0) {843 if (rc == -EIO)844 rc = -EINVAL;845 goto out;846 }847 848 netpid = current->tgid;849 850set_via_filehandle:851 rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid);852 if (!rc)853 cinode->cifsAttrs = le32_to_cpu(buf->Attributes);854 855 if (open_file == NULL)856 CIFSSMBClose(xid, tcon, fid.netfid);857 else858 cifsFileInfo_put(open_file);859out:860 if (tlink != NULL)861 cifs_put_tlink(tlink);862 return rc;863}864 865static int866cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon,867 struct cifsFileInfo *cfile)868{869 return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid);870}871 872static int873cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon,874 const char *path, struct cifs_sb_info *cifs_sb,875 struct cifs_fid *fid, __u16 search_flags,876 struct cifs_search_info *srch_inf)877{878 int rc;879 880 rc = CIFSFindFirst(xid, tcon, path, cifs_sb,881 &fid->netfid, search_flags, srch_inf, true);882 if (rc)883 cifs_dbg(FYI, "find first failed=%d\n", rc);884 return rc;885}886 887static int888cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon,889 struct cifs_fid *fid, __u16 search_flags,890 struct cifs_search_info *srch_inf)891{892 return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf);893}894 895static int896cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon,897 struct cifs_fid *fid)898{899 return CIFSFindClose(xid, tcon, fid->netfid);900}901 902static int903cifs_oplock_response(struct cifs_tcon *tcon, __u64 persistent_fid,904 __u64 volatile_fid, __u16 net_fid, struct cifsInodeInfo *cinode)905{906 return CIFSSMBLock(0, tcon, net_fid, current->tgid, 0, 0, 0, 0,907 LOCKING_ANDX_OPLOCK_RELEASE, false, CIFS_CACHE_READ(cinode) ? 1 : 0);908}909 910static int911cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon,912 const char *path, struct cifs_sb_info *cifs_sb, struct kstatfs *buf)913{914 int rc = -EOPNOTSUPP;915 916 buf->f_type = CIFS_SUPER_MAGIC;917 918 /*919 * We could add a second check for a QFS Unix capability bit920 */921 if ((tcon->ses->capabilities & CAP_UNIX) &&922 (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability)))923 rc = CIFSSMBQFSPosixInfo(xid, tcon, buf);924 925 /*926 * Only need to call the old QFSInfo if failed on newer one,927 * e.g. by OS/2.928 **/929 if (rc && (tcon->ses->capabilities & CAP_NT_SMBS))930 rc = CIFSSMBQFSInfo(xid, tcon, buf);931 932 /*933 * Some old Windows servers also do not support level 103, retry with934 * older level one if old server failed the previous call or we935 * bypassed it because we detected that this was an older LANMAN sess936 */937 if (rc)938 rc = SMBOldQFSInfo(xid, tcon, buf);939 return rc;940}941 942static int943cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset,944 __u64 length, __u32 type, int lock, int unlock, bool wait)945{946 return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid,947 current->tgid, length, offset, unlock, lock,948 (__u8)type, wait, 0);949}950 951static int952cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,953 const unsigned char *searchName, char **symlinkinfo,954 const struct nls_table *nls_codepage)955{956#ifdef CONFIG_CIFS_DFS_UPCALL957 int rc;958 struct dfs_info3_param referral = {0};959 960 rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral,961 0);962 963 if (!rc) {964 *symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL);965 free_dfs_info_param(&referral);966 if (!*symlinkinfo)967 rc = -ENOMEM;968 }969 return rc;970#else /* No DFS support */971 return -EREMOTE;972#endif973}974 975static int cifs_query_symlink(const unsigned int xid,976 struct cifs_tcon *tcon,977 struct cifs_sb_info *cifs_sb,978 const char *full_path,979 char **target_path)980{981 int rc;982 983 cifs_tcon_dbg(FYI, "%s: path=%s\n", __func__, full_path);984 985 if (!cap_unix(tcon->ses))986 return -EOPNOTSUPP;987 988 rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path,989 cifs_sb->local_nls, cifs_remap(cifs_sb));990 if (rc == -EREMOTE)991 rc = cifs_unix_dfs_readlink(xid, tcon, full_path,992 target_path, cifs_sb->local_nls);993 return rc;994}995 996static int cifs_parse_reparse_point(struct cifs_sb_info *cifs_sb,997 struct kvec *rsp_iov,998 struct cifs_open_info_data *data)999{1000 struct reparse_data_buffer *buf;1001 TRANSACT_IOCTL_RSP *io = rsp_iov->iov_base;1002 bool unicode = !!(io->hdr.Flags2 & SMBFLG2_UNICODE);1003 u32 plen = le16_to_cpu(io->ByteCount);1004 1005 buf = (struct reparse_data_buffer *)((__u8 *)&io->hdr.Protocol +1006 le32_to_cpu(io->DataOffset));1007 return parse_reparse_point(buf, plen, cifs_sb, unicode, data);1008}1009 1010static bool1011cifs_is_read_op(__u32 oplock)1012{1013 return oplock == OPLOCK_READ;1014}1015 1016static unsigned int1017cifs_wp_retry_size(struct inode *inode)1018{1019 return CIFS_SB(inode->i_sb)->ctx->wsize;1020}1021 1022static bool1023cifs_dir_needs_close(struct cifsFileInfo *cfile)1024{1025 return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle;1026}1027 1028static bool1029cifs_can_echo(struct TCP_Server_Info *server)1030{1031 if (server->tcpStatus == CifsGood)1032 return true;1033 1034 return false;1035}1036 1037static int1038cifs_make_node(unsigned int xid, struct inode *inode,1039 struct dentry *dentry, struct cifs_tcon *tcon,1040 const char *full_path, umode_t mode, dev_t dev)1041{1042 struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb);1043 struct inode *newinode = NULL;1044 int rc;1045 1046 if (tcon->unix_ext) {1047 /*1048 * SMB1 Unix Extensions: requires server support but1049 * works with all special files1050 */1051 struct cifs_unix_set_info_args args = {1052 .mode = mode & ~current_umask(),1053 .ctime = NO_CHANGE_64,1054 .atime = NO_CHANGE_64,1055 .mtime = NO_CHANGE_64,1056 .device = dev,1057 };1058 if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) {1059 args.uid = current_fsuid();1060 args.gid = current_fsgid();1061 } else {1062 args.uid = INVALID_UID; /* no change */1063 args.gid = INVALID_GID; /* no change */1064 }1065 rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args,1066 cifs_sb->local_nls,1067 cifs_remap(cifs_sb));1068 if (rc)1069 return rc;1070 1071 rc = cifs_get_inode_info_unix(&newinode, full_path,1072 inode->i_sb, xid);1073 1074 if (rc == 0)1075 d_instantiate(dentry, newinode);1076 return rc;1077 }1078 /*1079 * Check if mounted with mount parm 'sfu' mount parm.1080 * SFU emulation should work with all servers, but only1081 * supports block and char device, socket & fifo,1082 * and was used by default in earlier versions of Windows1083 */1084 if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL))1085 return -EPERM;1086 return cifs_sfu_make_node(xid, inode, dentry, tcon,1087 full_path, mode, dev);1088}1089 1090struct smb_version_operations smb1_operations = {1091 .send_cancel = send_nt_cancel,1092 .compare_fids = cifs_compare_fids,1093 .setup_request = cifs_setup_request,1094 .setup_async_request = cifs_setup_async_request,1095 .check_receive = cifs_check_receive,1096 .add_credits = cifs_add_credits,1097 .set_credits = cifs_set_credits,1098 .get_credits_field = cifs_get_credits_field,1099 .get_credits = cifs_get_credits,1100 .wait_mtu_credits = cifs_wait_mtu_credits,1101 .get_next_mid = cifs_get_next_mid,1102 .read_data_offset = cifs_read_data_offset,1103 .read_data_length = cifs_read_data_length,1104 .map_error = map_smb_to_linux_error,1105 .find_mid = cifs_find_mid,1106 .check_message = checkSMB,1107 .dump_detail = cifs_dump_detail,1108 .clear_stats = cifs_clear_stats,1109 .print_stats = cifs_print_stats,1110 .is_oplock_break = is_valid_oplock_break,1111 .downgrade_oplock = cifs_downgrade_oplock,1112 .check_trans2 = cifs_check_trans2,1113 .need_neg = cifs_need_neg,1114 .negotiate = cifs_negotiate,1115 .negotiate_wsize = cifs_negotiate_wsize,1116 .negotiate_rsize = cifs_negotiate_rsize,1117 .sess_setup = CIFS_SessSetup,1118 .logoff = CIFSSMBLogoff,1119 .tree_connect = CIFSTCon,1120 .tree_disconnect = CIFSSMBTDis,1121 .get_dfs_refer = CIFSGetDFSRefer,1122 .qfs_tcon = cifs_qfs_tcon,1123 .is_path_accessible = cifs_is_path_accessible,1124 .can_echo = cifs_can_echo,1125 .query_path_info = cifs_query_path_info,1126 .query_reparse_point = cifs_query_reparse_point,1127 .query_file_info = cifs_query_file_info,1128 .get_srv_inum = cifs_get_srv_inum,1129 .set_path_size = CIFSSMBSetEOF,1130 .set_file_size = CIFSSMBSetFileSize,1131 .set_file_info = smb_set_file_info,1132 .set_compression = cifs_set_compression,1133 .echo = CIFSSMBEcho,1134 .mkdir = CIFSSMBMkDir,1135 .mkdir_setinfo = cifs_mkdir_setinfo,1136 .rmdir = CIFSSMBRmDir,1137 .unlink = CIFSSMBDelFile,1138 .rename_pending_delete = cifs_rename_pending_delete,1139 .rename = CIFSSMBRename,1140 .create_hardlink = CIFSCreateHardLink,1141 .query_symlink = cifs_query_symlink,1142 .parse_reparse_point = cifs_parse_reparse_point,1143 .open = cifs_open_file,1144 .set_fid = cifs_set_fid,1145 .close = cifs_close_file,1146 .flush = cifs_flush_file,1147 .async_readv = cifs_async_readv,1148 .async_writev = cifs_async_writev,1149 .sync_read = cifs_sync_read,1150 .sync_write = cifs_sync_write,1151 .query_dir_first = cifs_query_dir_first,1152 .query_dir_next = cifs_query_dir_next,1153 .close_dir = cifs_close_dir,1154 .calc_smb_size = smbCalcSize,1155 .oplock_response = cifs_oplock_response,1156 .queryfs = cifs_queryfs,1157 .mand_lock = cifs_mand_lock,1158 .mand_unlock_range = cifs_unlock_range,1159 .push_mand_locks = cifs_push_mandatory_locks,1160 .query_mf_symlink = cifs_query_mf_symlink,1161 .create_mf_symlink = cifs_create_mf_symlink,1162 .is_read_op = cifs_is_read_op,1163 .wp_retry_size = cifs_wp_retry_size,1164 .dir_needs_close = cifs_dir_needs_close,1165 .select_sectype = cifs_select_sectype,1166#ifdef CONFIG_CIFS_XATTR1167 .query_all_EAs = CIFSSMBQAllEAs,1168 .set_EA = CIFSSMBSetEA,1169#endif /* CIFS_XATTR */1170 .get_acl = get_cifs_acl,1171 .get_acl_by_fid = get_cifs_acl_by_fid,1172 .set_acl = set_cifs_acl,1173 .make_node = cifs_make_node,1174};1175 1176struct smb_version_values smb1_values = {1177 .version_string = SMB1_VERSION_STRING,1178 .protocol_id = SMB10_PROT_ID,1179 .large_lock_type = LOCKING_ANDX_LARGE_FILES,1180 .exclusive_lock_type = 0,1181 .shared_lock_type = LOCKING_ANDX_SHARED_LOCK,1182 .unlock_lock_type = 0,1183 .header_preamble_size = 4,1184 .header_size = sizeof(struct smb_hdr),1185 .max_header_size = MAX_CIFS_HDR_SIZE,1186 .read_rsp_size = sizeof(READ_RSP),1187 .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX),1188 .cap_unix = CAP_UNIX,1189 .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND,1190 .cap_large_files = CAP_LARGE_FILES,1191 .signing_enabled = SECMODE_SIGN_ENABLED,1192 .signing_required = SECMODE_SIGN_REQUIRED,1193};1194