diff options
Diffstat (limited to 'fs/smb/client/smb1ops.c')
| -rw-r--r-- | fs/smb/client/smb1ops.c | 1276 |
1 files changed, 1276 insertions, 0 deletions
diff --git a/fs/smb/client/smb1ops.c b/fs/smb/client/smb1ops.c new file mode 100644 index 000000000000..7d1b3fc014d9 --- /dev/null +++ b/fs/smb/client/smb1ops.c @@ -0,0 +1,1276 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * SMB1 (CIFS) version specific operations + * + * Copyright (c) 2012, Jeff Layton <jlayton@redhat.com> + */ + +#include <linux/pagemap.h> +#include <linux/vfs.h> +#include <uapi/linux/magic.h> +#include "cifsglob.h" +#include "cifsproto.h" +#include "cifs_debug.h" +#include "cifspdu.h" +#include "cifs_unicode.h" +#include "fs_context.h" + +/* + * An NT cancel request header looks just like the original request except: + * + * The Command is SMB_COM_NT_CANCEL + * The WordCount is zeroed out + * The ByteCount is zeroed out + * + * This function mangles an existing request buffer into a + * SMB_COM_NT_CANCEL request and then sends it. + */ +static int +send_nt_cancel(struct TCP_Server_Info *server, struct smb_rqst *rqst, + struct mid_q_entry *mid) +{ + int rc = 0; + struct smb_hdr *in_buf = (struct smb_hdr *)rqst->rq_iov[0].iov_base; + + /* -4 for RFC1001 length and +2 for BCC field */ + in_buf->smb_buf_length = cpu_to_be32(sizeof(struct smb_hdr) - 4 + 2); + in_buf->Command = SMB_COM_NT_CANCEL; + in_buf->WordCount = 0; + put_bcc(0, in_buf); + + cifs_server_lock(server); + rc = cifs_sign_smb(in_buf, server, &mid->sequence_number); + if (rc) { + cifs_server_unlock(server); + return rc; + } + + /* + * The response to this call was already factored into the sequence + * number when the call went out, so we must adjust it back downward + * after signing here. + */ + --server->sequence_number; + rc = smb_send(server, in_buf, be32_to_cpu(in_buf->smb_buf_length)); + if (rc < 0) + server->sequence_number--; + + cifs_server_unlock(server); + + cifs_dbg(FYI, "issued NT_CANCEL for mid %u, rc = %d\n", + get_mid(in_buf), rc); + + return rc; +} + +static bool +cifs_compare_fids(struct cifsFileInfo *ob1, struct cifsFileInfo *ob2) +{ + return ob1->fid.netfid == ob2->fid.netfid; +} + +static unsigned int +cifs_read_data_offset(char *buf) +{ + READ_RSP *rsp = (READ_RSP *)buf; + return le16_to_cpu(rsp->DataOffset); +} + +static unsigned int +cifs_read_data_length(char *buf, bool in_remaining) +{ + READ_RSP *rsp = (READ_RSP *)buf; + /* It's a bug reading remaining data for SMB1 packets */ + WARN_ON(in_remaining); + return (le16_to_cpu(rsp->DataLengthHigh) << 16) + + le16_to_cpu(rsp->DataLength); +} + +static struct mid_q_entry * +cifs_find_mid(struct TCP_Server_Info *server, char *buffer) +{ + struct smb_hdr *buf = (struct smb_hdr *)buffer; + struct mid_q_entry *mid; + + spin_lock(&server->mid_lock); + list_for_each_entry(mid, &server->pending_mid_q, qhead) { + if (compare_mid(mid->mid, buf) && + mid->mid_state == MID_REQUEST_SUBMITTED && + le16_to_cpu(mid->command) == buf->Command) { + kref_get(&mid->refcount); + spin_unlock(&server->mid_lock); + return mid; + } + } + spin_unlock(&server->mid_lock); + return NULL; +} + +static void +cifs_add_credits(struct TCP_Server_Info *server, + const struct cifs_credits *credits, const int optype) +{ + spin_lock(&server->req_lock); + server->credits += credits->value; + server->in_flight--; + spin_unlock(&server->req_lock); + wake_up(&server->request_q); +} + +static void +cifs_set_credits(struct TCP_Server_Info *server, const int val) +{ + spin_lock(&server->req_lock); + server->credits = val; + server->oplocks = val > 1 ? enable_oplocks : false; + spin_unlock(&server->req_lock); +} + +static int * +cifs_get_credits_field(struct TCP_Server_Info *server, const int optype) +{ + return &server->credits; +} + +static unsigned int +cifs_get_credits(struct mid_q_entry *mid) +{ + return 1; +} + +/* + * Find a free multiplex id (SMB mid). Otherwise there could be + * mid collisions which might cause problems, demultiplexing the + * wrong response to this request. Multiplex ids could collide if + * one of a series requests takes much longer than the others, or + * if a very large number of long lived requests (byte range + * locks or FindNotify requests) are pending. No more than + * 64K-1 requests can be outstanding at one time. If no + * mids are available, return zero. A future optimization + * could make the combination of mids and uid the key we use + * to demultiplex on (rather than mid alone). + * In addition to the above check, the cifs demultiplex + * code already used the command code as a secondary + * check of the frame and if signing is negotiated the + * response would be discarded if the mid were the same + * but the signature was wrong. Since the mid is not put in the + * pending queue until later (when it is about to be dispatched) + * we do have to limit the number of outstanding requests + * to somewhat less than 64K-1 although it is hard to imagine + * so many threads being in the vfs at one time. + */ +static __u64 +cifs_get_next_mid(struct TCP_Server_Info *server) +{ + __u64 mid = 0; + __u16 last_mid, cur_mid; + bool collision, reconnect = false; + + spin_lock(&server->mid_lock); + + /* mid is 16 bit only for CIFS/SMB */ + cur_mid = (__u16)((server->CurrentMid) & 0xffff); + /* we do not want to loop forever */ + last_mid = cur_mid; + cur_mid++; + /* avoid 0xFFFF MID */ + if (cur_mid == 0xffff) + cur_mid++; + + /* + * This nested loop looks more expensive than it is. + * In practice the list of pending requests is short, + * fewer than 50, and the mids are likely to be unique + * on the first pass through the loop unless some request + * takes longer than the 64 thousand requests before it + * (and it would also have to have been a request that + * did not time out). + */ + while (cur_mid != last_mid) { + struct mid_q_entry *mid_entry; + unsigned int num_mids; + + collision = false; + if (cur_mid == 0) + cur_mid++; + + num_mids = 0; + list_for_each_entry(mid_entry, &server->pending_mid_q, qhead) { + ++num_mids; + if (mid_entry->mid == cur_mid && + mid_entry->mid_state == MID_REQUEST_SUBMITTED) { + /* This mid is in use, try a different one */ + collision = true; + break; + } + } + + /* + * if we have more than 32k mids in the list, then something + * is very wrong. Possibly a local user is trying to DoS the + * box by issuing long-running calls and SIGKILL'ing them. If + * we get to 2^16 mids then we're in big trouble as this + * function could loop forever. + * + * Go ahead and assign out the mid in this situation, but force + * an eventual reconnect to clean out the pending_mid_q. + */ + if (num_mids > 32768) + reconnect = true; + + if (!collision) { + mid = (__u64)cur_mid; + server->CurrentMid = mid; + break; + } + cur_mid++; + } + spin_unlock(&server->mid_lock); + + if (reconnect) { + cifs_signal_cifsd_for_reconnect(server, false); + } + + return mid; +} + +/* + return codes: + 0 not a transact2, or all data present + >0 transact2 with that much data missing + -EINVAL invalid transact2 + */ +static int +check2ndT2(char *buf) +{ + struct smb_hdr *pSMB = (struct smb_hdr *)buf; + struct smb_t2_rsp *pSMBt; + int remaining; + __u16 total_data_size, data_in_this_rsp; + + if (pSMB->Command != SMB_COM_TRANSACTION2) + return 0; + + /* check for plausible wct, bcc and t2 data and parm sizes */ + /* check for parm and data offset going beyond end of smb */ + if (pSMB->WordCount != 10) { /* coalesce_t2 depends on this */ + cifs_dbg(FYI, "Invalid transact2 word count\n"); + return -EINVAL; + } + + pSMBt = (struct smb_t2_rsp *)pSMB; + + total_data_size = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); + data_in_this_rsp = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); + + if (total_data_size == data_in_this_rsp) + return 0; + else if (total_data_size < data_in_this_rsp) { + cifs_dbg(FYI, "total data %d smaller than data in frame %d\n", + total_data_size, data_in_this_rsp); + return -EINVAL; + } + + remaining = total_data_size - data_in_this_rsp; + + cifs_dbg(FYI, "missing %d bytes from transact2, check next response\n", + remaining); + if (total_data_size > CIFSMaxBufSize) { + cifs_dbg(VFS, "TotalDataSize %d is over maximum buffer %d\n", + total_data_size, CIFSMaxBufSize); + return -EINVAL; + } + return remaining; +} + +static int +coalesce_t2(char *second_buf, struct smb_hdr *target_hdr) +{ + struct smb_t2_rsp *pSMBs = (struct smb_t2_rsp *)second_buf; + struct smb_t2_rsp *pSMBt = (struct smb_t2_rsp *)target_hdr; + char *data_area_of_tgt; + char *data_area_of_src; + int remaining; + unsigned int byte_count, total_in_tgt; + __u16 tgt_total_cnt, src_total_cnt, total_in_src; + + src_total_cnt = get_unaligned_le16(&pSMBs->t2_rsp.TotalDataCount); + tgt_total_cnt = get_unaligned_le16(&pSMBt->t2_rsp.TotalDataCount); + + if (tgt_total_cnt != src_total_cnt) + cifs_dbg(FYI, "total data count of primary and secondary t2 differ source=%hu target=%hu\n", + src_total_cnt, tgt_total_cnt); + + total_in_tgt = get_unaligned_le16(&pSMBt->t2_rsp.DataCount); + + remaining = tgt_total_cnt - total_in_tgt; + + if (remaining < 0) { + cifs_dbg(FYI, "Server sent too much data. tgt_total_cnt=%hu total_in_tgt=%u\n", + tgt_total_cnt, total_in_tgt); + return -EPROTO; + } + + if (remaining == 0) { + /* nothing to do, ignore */ + cifs_dbg(FYI, "no more data remains\n"); + return 0; + } + + total_in_src = get_unaligned_le16(&pSMBs->t2_rsp.DataCount); + if (remaining < total_in_src) + cifs_dbg(FYI, "transact2 2nd response contains too much data\n"); + + /* find end of first SMB data area */ + data_area_of_tgt = (char *)&pSMBt->hdr.Protocol + + get_unaligned_le16(&pSMBt->t2_rsp.DataOffset); + + /* validate target area */ + data_area_of_src = (char *)&pSMBs->hdr.Protocol + + get_unaligned_le16(&pSMBs->t2_rsp.DataOffset); + + data_area_of_tgt += total_in_tgt; + + total_in_tgt += total_in_src; + /* is the result too big for the field? */ + if (total_in_tgt > USHRT_MAX) { + cifs_dbg(FYI, "coalesced DataCount too large (%u)\n", + total_in_tgt); + return -EPROTO; + } + put_unaligned_le16(total_in_tgt, &pSMBt->t2_rsp.DataCount); + + /* fix up the BCC */ + byte_count = get_bcc(target_hdr); + byte_count += total_in_src; + /* is the result too big for the field? */ + if (byte_count > USHRT_MAX) { + cifs_dbg(FYI, "coalesced BCC too large (%u)\n", byte_count); + return -EPROTO; + } + put_bcc(byte_count, target_hdr); + + byte_count = be32_to_cpu(target_hdr->smb_buf_length); + byte_count += total_in_src; + /* don't allow buffer to overflow */ + if (byte_count > CIFSMaxBufSize + MAX_CIFS_HDR_SIZE - 4) { + cifs_dbg(FYI, "coalesced BCC exceeds buffer size (%u)\n", + byte_count); + return -ENOBUFS; + } + target_hdr->smb_buf_length = cpu_to_be32(byte_count); + + /* copy second buffer into end of first buffer */ + memcpy(data_area_of_tgt, data_area_of_src, total_in_src); + + if (remaining != total_in_src) { + /* more responses to go */ + cifs_dbg(FYI, "waiting for more secondary responses\n"); + return 1; + } + + /* we are done */ + cifs_dbg(FYI, "found the last secondary response\n"); + return 0; +} + +static void +cifs_downgrade_oplock(struct TCP_Server_Info *server, + struct cifsInodeInfo *cinode, __u32 oplock, + unsigned int epoch, bool *purge_cache) +{ + cifs_set_oplock_level(cinode, oplock); +} + +static bool +cifs_check_trans2(struct mid_q_entry *mid, struct TCP_Server_Info *server, + char *buf, int malformed) +{ + if (malformed) + return false; + if (check2ndT2(buf) <= 0) + return false; + mid->multiRsp = true; + if (mid->resp_buf) { + /* merge response - fix up 1st*/ + malformed = coalesce_t2(buf, mid->resp_buf); + if (malformed > 0) + return true; + /* All parts received or packet is malformed. */ + mid->multiEnd = true; + dequeue_mid(mid, malformed); + return true; + } + if (!server->large_buf) { + /*FIXME: switch to already allocated largebuf?*/ + cifs_dbg(VFS, "1st trans2 resp needs bigbuf\n"); + } else { + /* Have first buffer */ + mid->resp_buf = buf; + mid->large_buf = true; + server->bigbuf = NULL; + } + return true; +} + +static bool +cifs_need_neg(struct TCP_Server_Info *server) +{ + return server->maxBuf == 0; +} + +static int +cifs_negotiate(const unsigned int xid, + struct cifs_ses *ses, + struct TCP_Server_Info *server) +{ + int rc; + rc = CIFSSMBNegotiate(xid, ses, server); + if (rc == -EAGAIN) { + /* retry only once on 1st time connection */ + set_credits(server, 1); + rc = CIFSSMBNegotiate(xid, ses, server); + if (rc == -EAGAIN) + rc = -EHOSTDOWN; + } + return rc; +} + +static unsigned int +cifs_negotiate_wsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) +{ + __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); + struct TCP_Server_Info *server = tcon->ses->server; + unsigned int wsize; + + /* start with specified wsize, or default */ + if (ctx->wsize) + wsize = ctx->wsize; + else if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) + wsize = CIFS_DEFAULT_IOSIZE; + else + wsize = CIFS_DEFAULT_NON_POSIX_WSIZE; + + /* can server support 24-bit write sizes? (via UNIX extensions) */ + if (!tcon->unix_ext || !(unix_cap & CIFS_UNIX_LARGE_WRITE_CAP)) + wsize = min_t(unsigned int, wsize, CIFS_MAX_RFC1002_WSIZE); + + /* + * no CAP_LARGE_WRITE_X or is signing enabled without CAP_UNIX set? + * Limit it to max buffer offered by the server, minus the size of the + * WRITEX header, not including the 4 byte RFC1001 length. + */ + if (!(server->capabilities & CAP_LARGE_WRITE_X) || + (!(server->capabilities & CAP_UNIX) && server->sign)) + wsize = min_t(unsigned int, wsize, + server->maxBuf - sizeof(WRITE_REQ) + 4); + + /* hard limit of CIFS_MAX_WSIZE */ + wsize = min_t(unsigned int, wsize, CIFS_MAX_WSIZE); + + return wsize; +} + +static unsigned int +cifs_negotiate_rsize(struct cifs_tcon *tcon, struct smb3_fs_context *ctx) +{ + __u64 unix_cap = le64_to_cpu(tcon->fsUnixInfo.Capability); + struct TCP_Server_Info *server = tcon->ses->server; + unsigned int rsize, defsize; + + /* + * Set default value... + * + * HACK alert! Ancient servers have very small buffers. Even though + * MS-CIFS indicates that servers are only limited by the client's + * bufsize for reads, testing against win98se shows that it throws + * INVALID_PARAMETER errors if you try to request too large a read. + * OS/2 just sends back short reads. + * + * If the server doesn't advertise CAP_LARGE_READ_X, then assume that + * it can't handle a read request larger than its MaxBufferSize either. + */ + if (tcon->unix_ext && (unix_cap & CIFS_UNIX_LARGE_READ_CAP)) + defsize = CIFS_DEFAULT_IOSIZE; + else if (server->capabilities & CAP_LARGE_READ_X) + defsize = CIFS_DEFAULT_NON_POSIX_RSIZE; + else + defsize = server->maxBuf - sizeof(READ_RSP); + + rsize = ctx->rsize ? ctx->rsize : defsize; + + /* + * no CAP_LARGE_READ_X? Then MS-CIFS states that we must limit this to + * the client's MaxBufferSize. + */ + if (!(server->capabilities & CAP_LARGE_READ_X)) + rsize = min_t(unsigned int, CIFSMaxBufSize, rsize); + + /* hard limit of CIFS_MAX_RSIZE */ + rsize = min_t(unsigned int, rsize, CIFS_MAX_RSIZE); + + return rsize; +} + +static void +cifs_qfs_tcon(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb) +{ + CIFSSMBQFSDeviceInfo(xid, tcon); + CIFSSMBQFSAttributeInfo(xid, tcon); +} + +static int +cifs_is_path_accessible(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const char *full_path) +{ + int rc; + FILE_ALL_INFO *file_info; + + file_info = kmalloc(sizeof(FILE_ALL_INFO), GFP_KERNEL); + if (file_info == NULL) + return -ENOMEM; + + rc = CIFSSMBQPathInfo(xid, tcon, full_path, file_info, + 0 /* not legacy */, cifs_sb->local_nls, + cifs_remap(cifs_sb)); + + if (rc == -EOPNOTSUPP || rc == -EINVAL) + rc = SMBQueryInformation(xid, tcon, full_path, file_info, + cifs_sb->local_nls, cifs_remap(cifs_sb)); + kfree(file_info); + return rc; +} + +static int cifs_query_path_info(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const char *full_path, + struct cifs_open_info_data *data, bool *adjustTZ, bool *symlink) +{ + int rc; + FILE_ALL_INFO fi = {}; + + *symlink = false; + + /* could do find first instead but this returns more info */ + rc = CIFSSMBQPathInfo(xid, tcon, full_path, &fi, 0 /* not legacy */, cifs_sb->local_nls, + cifs_remap(cifs_sb)); + /* + * BB optimize code so we do not make the above call when server claims + * no NT SMB support and the above call failed at least once - set flag + * in tcon or mount. + */ + if ((rc == -EOPNOTSUPP) || (rc == -EINVAL)) { + rc = SMBQueryInformation(xid, tcon, full_path, &fi, cifs_sb->local_nls, + cifs_remap(cifs_sb)); + *adjustTZ = true; + } + + if (!rc) { + int tmprc; + int oplock = 0; + struct cifs_fid fid; + struct cifs_open_parms oparms; + + move_cifs_info_to_smb2(&data->fi, &fi); + + if (!(le32_to_cpu(fi.Attributes) & ATTR_REPARSE)) + return 0; + + oparms = (struct cifs_open_parms) { + .tcon = tcon, + .cifs_sb = cifs_sb, + .desired_access = FILE_READ_ATTRIBUTES, + .create_options = cifs_create_options(cifs_sb, 0), + .disposition = FILE_OPEN, + .path = full_path, + .fid = &fid, + }; + + /* Need to check if this is a symbolic link or not */ + tmprc = CIFS_open(xid, &oparms, &oplock, NULL); + if (tmprc == -EOPNOTSUPP) + *symlink = true; + else if (tmprc == 0) + CIFSSMBClose(xid, tcon, fid.netfid); + } + + return rc; +} + +static int cifs_get_srv_inum(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const char *full_path, + u64 *uniqueid, struct cifs_open_info_data *unused) +{ + /* + * We can not use the IndexNumber field by default from Windows or + * Samba (in ALL_INFO buf) but we can request it explicitly. The SNIA + * CIFS spec claims that this value is unique within the scope of a + * share, and the windows docs hint that it's actually unique + * per-machine. + * + * There may be higher info levels that work but are there Windows + * server or network appliances for which IndexNumber field is not + * guaranteed unique? + */ + return CIFSGetSrvInodeNumber(xid, tcon, full_path, uniqueid, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); +} + +static int cifs_query_file_info(const unsigned int xid, struct cifs_tcon *tcon, + struct cifsFileInfo *cfile, struct cifs_open_info_data *data) +{ + int rc; + FILE_ALL_INFO fi = {}; + + if (cfile->symlink_target) { + data->symlink_target = kstrdup(cfile->symlink_target, GFP_KERNEL); + if (!data->symlink_target) + return -ENOMEM; + } + + rc = CIFSSMBQFileInfo(xid, tcon, cfile->fid.netfid, &fi); + if (!rc) + move_cifs_info_to_smb2(&data->fi, &fi); + return rc; +} + +static void +cifs_clear_stats(struct cifs_tcon *tcon) +{ + atomic_set(&tcon->stats.cifs_stats.num_writes, 0); + atomic_set(&tcon->stats.cifs_stats.num_reads, 0); + atomic_set(&tcon->stats.cifs_stats.num_flushes, 0); + atomic_set(&tcon->stats.cifs_stats.num_oplock_brks, 0); + atomic_set(&tcon->stats.cifs_stats.num_opens, 0); + atomic_set(&tcon->stats.cifs_stats.num_posixopens, 0); + atomic_set(&tcon->stats.cifs_stats.num_posixmkdirs, 0); + atomic_set(&tcon->stats.cifs_stats.num_closes, 0); + atomic_set(&tcon->stats.cifs_stats.num_deletes, 0); + atomic_set(&tcon->stats.cifs_stats.num_mkdirs, 0); + atomic_set(&tcon->stats.cifs_stats.num_rmdirs, 0); + atomic_set(&tcon->stats.cifs_stats.num_renames, 0); + atomic_set(&tcon->stats.cifs_stats.num_t2renames, 0); + atomic_set(&tcon->stats.cifs_stats.num_ffirst, 0); + atomic_set(&tcon->stats.cifs_stats.num_fnext, 0); + atomic_set(&tcon->stats.cifs_stats.num_fclose, 0); + atomic_set(&tcon->stats.cifs_stats.num_hardlinks, 0); + atomic_set(&tcon->stats.cifs_stats.num_symlinks, 0); + atomic_set(&tcon->stats.cifs_stats.num_locks, 0); + atomic_set(&tcon->stats.cifs_stats.num_acl_get, 0); + atomic_set(&tcon->stats.cifs_stats.num_acl_set, 0); +} + +static void +cifs_print_stats(struct seq_file *m, struct cifs_tcon *tcon) +{ + seq_printf(m, " Oplocks breaks: %d", + atomic_read(&tcon->stats.cifs_stats.num_oplock_brks)); + seq_printf(m, "\nReads: %d Bytes: %llu", + atomic_read(&tcon->stats.cifs_stats.num_reads), + (long long)(tcon->bytes_read)); + seq_printf(m, "\nWrites: %d Bytes: %llu", + atomic_read(&tcon->stats.cifs_stats.num_writes), + (long long)(tcon->bytes_written)); + seq_printf(m, "\nFlushes: %d", + atomic_read(&tcon->stats.cifs_stats.num_flushes)); + seq_printf(m, "\nLocks: %d HardLinks: %d Symlinks: %d", + atomic_read(&tcon->stats.cifs_stats.num_locks), + atomic_read(&tcon->stats.cifs_stats.num_hardlinks), + atomic_read(&tcon->stats.cifs_stats.num_symlinks)); + seq_printf(m, "\nOpens: %d Closes: %d Deletes: %d", + atomic_read(&tcon->stats.cifs_stats.num_opens), + atomic_read(&tcon->stats.cifs_stats.num_closes), + atomic_read(&tcon->stats.cifs_stats.num_deletes)); + seq_printf(m, "\nPosix Opens: %d Posix Mkdirs: %d", + atomic_read(&tcon->stats.cifs_stats.num_posixopens), + atomic_read(&tcon->stats.cifs_stats.num_posixmkdirs)); + seq_printf(m, "\nMkdirs: %d Rmdirs: %d", + atomic_read(&tcon->stats.cifs_stats.num_mkdirs), + atomic_read(&tcon->stats.cifs_stats.num_rmdirs)); + seq_printf(m, "\nRenames: %d T2 Renames %d", + atomic_read(&tcon->stats.cifs_stats.num_renames), + atomic_read(&tcon->stats.cifs_stats.num_t2renames)); + seq_printf(m, "\nFindFirst: %d FNext %d FClose %d", + atomic_read(&tcon->stats.cifs_stats.num_ffirst), + atomic_read(&tcon->stats.cifs_stats.num_fnext), + atomic_read(&tcon->stats.cifs_stats.num_fclose)); +} + +static void +cifs_mkdir_setinfo(struct inode *inode, const char *full_path, + struct cifs_sb_info *cifs_sb, struct cifs_tcon *tcon, + const unsigned int xid) +{ + FILE_BASIC_INFO info; + struct cifsInodeInfo *cifsInode; + u32 dosattrs; + int rc; + + memset(&info, 0, sizeof(info)); + cifsInode = CIFS_I(inode); + dosattrs = cifsInode->cifsAttrs|ATTR_READONLY; + info.Attributes = cpu_to_le32(dosattrs); + rc = CIFSSMBSetPathInfo(xid, tcon, full_path, &info, cifs_sb->local_nls, + cifs_sb); + if (rc == 0) + cifsInode->cifsAttrs = dosattrs; +} + +static int cifs_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, + void *buf) +{ + struct cifs_open_info_data *data = buf; + FILE_ALL_INFO fi = {}; + int rc; + + if (!(oparms->tcon->ses->capabilities & CAP_NT_SMBS)) + rc = SMBLegacyOpen(xid, oparms->tcon, oparms->path, + oparms->disposition, + oparms->desired_access, + oparms->create_options, + &oparms->fid->netfid, oplock, &fi, + oparms->cifs_sb->local_nls, + cifs_remap(oparms->cifs_sb)); + else + rc = CIFS_open(xid, oparms, oplock, &fi); + + if (!rc && data) + move_cifs_info_to_smb2(&data->fi, &fi); + + return rc; +} + +static void +cifs_set_fid(struct cifsFileInfo *cfile, struct cifs_fid *fid, __u32 oplock) +{ + struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); + cfile->fid.netfid = fid->netfid; + cifs_set_oplock_level(cinode, oplock); + cinode->can_cache_brlcks = CIFS_CACHE_WRITE(cinode); +} + +static void +cifs_close_file(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_fid *fid) +{ + CIFSSMBClose(xid, tcon, fid->netfid); +} + +static int +cifs_flush_file(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_fid *fid) +{ + return CIFSSMBFlush(xid, tcon, fid->netfid); +} + +static int +cifs_sync_read(const unsigned int xid, struct cifs_fid *pfid, + struct cifs_io_parms *parms, unsigned int *bytes_read, + char **buf, int *buf_type) +{ + parms->netfid = pfid->netfid; + return CIFSSMBRead(xid, parms, bytes_read, buf, buf_type); +} + +static int +cifs_sync_write(const unsigned int xid, struct cifs_fid *pfid, + struct cifs_io_parms *parms, unsigned int *written, + struct kvec *iov, unsigned long nr_segs) +{ + + parms->netfid = pfid->netfid; + return CIFSSMBWrite2(xid, parms, written, iov, nr_segs); +} + +static int +smb_set_file_info(struct inode *inode, const char *full_path, + FILE_BASIC_INFO *buf, const unsigned int xid) +{ + int oplock = 0; + int rc; + __u32 netpid; + struct cifs_fid fid; + struct cifs_open_parms oparms; + struct cifsFileInfo *open_file; + struct cifsInodeInfo *cinode = CIFS_I(inode); + struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); + struct tcon_link *tlink = NULL; + struct cifs_tcon *tcon; + + /* if the file is already open for write, just use that fileid */ + open_file = find_writable_file(cinode, FIND_WR_FSUID_ONLY); + if (open_file) { + fid.netfid = open_file->fid.netfid; + netpid = open_file->pid; + tcon = tlink_tcon(open_file->tlink); + goto set_via_filehandle; + } + + tlink = cifs_sb_tlink(cifs_sb); + if (IS_ERR(tlink)) { + rc = PTR_ERR(tlink); + tlink = NULL; + goto out; + } + tcon = tlink_tcon(tlink); + + rc = CIFSSMBSetPathInfo(xid, tcon, full_path, buf, cifs_sb->local_nls, + cifs_sb); + if (rc == 0) { + cinode->cifsAttrs = le32_to_cpu(buf->Attributes); + goto out; + } else if (rc != -EOPNOTSUPP && rc != -EINVAL) { + goto out; + } + + oparms = (struct cifs_open_parms) { + .tcon = tcon, + .cifs_sb = cifs_sb, + .desired_access = SYNCHRONIZE | FILE_WRITE_ATTRIBUTES, + .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR), + .disposition = FILE_OPEN, + .path = full_path, + .fid = &fid, + }; + + cifs_dbg(FYI, "calling SetFileInfo since SetPathInfo for times not supported by this server\n"); + rc = CIFS_open(xid, &oparms, &oplock, NULL); + if (rc != 0) { + if (rc == -EIO) + rc = -EINVAL; + goto out; + } + + netpid = current->tgid; + +set_via_filehandle: + rc = CIFSSMBSetFileInfo(xid, tcon, buf, fid.netfid, netpid); + if (!rc) + cinode->cifsAttrs = le32_to_cpu(buf->Attributes); + + if (open_file == NULL) + CIFSSMBClose(xid, tcon, fid.netfid); + else + cifsFileInfo_put(open_file); +out: + if (tlink != NULL) + cifs_put_tlink(tlink); + return rc; +} + +static int +cifs_set_compression(const unsigned int xid, struct cifs_tcon *tcon, + struct cifsFileInfo *cfile) +{ + return CIFSSMB_set_compression(xid, tcon, cfile->fid.netfid); +} + +static int +cifs_query_dir_first(const unsigned int xid, struct cifs_tcon *tcon, + const char *path, struct cifs_sb_info *cifs_sb, + struct cifs_fid *fid, __u16 search_flags, + struct cifs_search_info *srch_inf) +{ + int rc; + + rc = CIFSFindFirst(xid, tcon, path, cifs_sb, + &fid->netfid, search_flags, srch_inf, true); + if (rc) + cifs_dbg(FYI, "find first failed=%d\n", rc); + return rc; +} + +static int +cifs_query_dir_next(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_fid *fid, __u16 search_flags, + struct cifs_search_info *srch_inf) +{ + return CIFSFindNext(xid, tcon, fid->netfid, search_flags, srch_inf); +} + +static int +cifs_close_dir(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_fid *fid) +{ + return CIFSFindClose(xid, tcon, fid->netfid); +} + +static int +cifs_oplock_response(struct cifs_tcon *tcon, __u64 persistent_fid, + __u64 volatile_fid, __u16 net_fid, struct cifsInodeInfo *cinode) +{ + return CIFSSMBLock(0, tcon, net_fid, current->tgid, 0, 0, 0, 0, + LOCKING_ANDX_OPLOCK_RELEASE, false, CIFS_CACHE_READ(cinode) ? 1 : 0); +} + +static int +cifs_queryfs(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, struct kstatfs *buf) +{ + int rc = -EOPNOTSUPP; + + buf->f_type = CIFS_SUPER_MAGIC; + + /* + * We could add a second check for a QFS Unix capability bit + */ + if ((tcon->ses->capabilities & CAP_UNIX) && + (CIFS_POSIX_EXTENSIONS & le64_to_cpu(tcon->fsUnixInfo.Capability))) + rc = CIFSSMBQFSPosixInfo(xid, tcon, buf); + + /* + * Only need to call the old QFSInfo if failed on newer one, + * e.g. by OS/2. + **/ + if (rc && (tcon->ses->capabilities & CAP_NT_SMBS)) + rc = CIFSSMBQFSInfo(xid, tcon, buf); + + /* + * Some old Windows servers also do not support level 103, retry with + * older level one if old server failed the previous call or we + * bypassed it because we detected that this was an older LANMAN sess + */ + if (rc) + rc = SMBOldQFSInfo(xid, tcon, buf); + return rc; +} + +static int +cifs_mand_lock(const unsigned int xid, struct cifsFileInfo *cfile, __u64 offset, + __u64 length, __u32 type, int lock, int unlock, bool wait) +{ + return CIFSSMBLock(xid, tlink_tcon(cfile->tlink), cfile->fid.netfid, + current->tgid, length, offset, unlock, lock, + (__u8)type, wait, 0); +} + +static int +cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon, + const unsigned char *searchName, char **symlinkinfo, + const struct nls_table *nls_codepage) +{ +#ifdef CONFIG_CIFS_DFS_UPCALL + int rc; + struct dfs_info3_param referral = {0}; + + rc = get_dfs_path(xid, tcon->ses, searchName, nls_codepage, &referral, + 0); + + if (!rc) { + *symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL); + free_dfs_info_param(&referral); + if (!*symlinkinfo) + rc = -ENOMEM; + } + return rc; +#else /* No DFS support */ + return -EREMOTE; +#endif +} + +static int +cifs_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, + struct cifs_sb_info *cifs_sb, const char *full_path, + char **target_path, bool is_reparse_point) +{ + int rc; + int oplock = 0; + struct cifs_fid fid; + struct cifs_open_parms oparms; + + cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path); + + if (is_reparse_point) { + cifs_dbg(VFS, "reparse points not handled for SMB1 symlinks\n"); + return -EOPNOTSUPP; + } + + /* Check for unix extensions */ + if (cap_unix(tcon->ses)) { + rc = CIFSSMBUnixQuerySymLink(xid, tcon, full_path, target_path, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); + if (rc == -EREMOTE) + rc = cifs_unix_dfs_readlink(xid, tcon, full_path, + target_path, + cifs_sb->local_nls); + + goto out; + } + + oparms = (struct cifs_open_parms) { + .tcon = tcon, + .cifs_sb = cifs_sb, + .desired_access = FILE_READ_ATTRIBUTES, + .create_options = cifs_create_options(cifs_sb, + OPEN_REPARSE_POINT), + .disposition = FILE_OPEN, + .path = full_path, + .fid = &fid, + }; + + rc = CIFS_open(xid, &oparms, &oplock, NULL); + if (rc) + goto out; + + rc = CIFSSMBQuerySymLink(xid, tcon, fid.netfid, target_path, + cifs_sb->local_nls); + if (rc) + goto out_close; + + convert_delimiter(*target_path, '/'); +out_close: + CIFSSMBClose(xid, tcon, fid.netfid); +out: + if (!rc) + cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path); + return rc; +} + +static bool +cifs_is_read_op(__u32 oplock) +{ + return oplock == OPLOCK_READ; +} + +static unsigned int +cifs_wp_retry_size(struct inode *inode) +{ + return CIFS_SB(inode->i_sb)->ctx->wsize; +} + +static bool +cifs_dir_needs_close(struct cifsFileInfo *cfile) +{ + return !cfile->srch_inf.endOfSearch && !cfile->invalidHandle; +} + +static bool +cifs_can_echo(struct TCP_Server_Info *server) +{ + if (server->tcpStatus == CifsGood) + return true; + + return false; +} + +static int +cifs_make_node(unsigned int xid, struct inode *inode, + struct dentry *dentry, struct cifs_tcon *tcon, + const char *full_path, umode_t mode, dev_t dev) +{ + struct cifs_sb_info *cifs_sb = CIFS_SB(inode->i_sb); + struct inode *newinode = NULL; + int rc = -EPERM; + struct cifs_open_info_data buf = {}; + struct cifs_io_parms io_parms; + __u32 oplock = 0; + struct cifs_fid fid; + struct cifs_open_parms oparms; + unsigned int bytes_written; + struct win_dev *pdev; + struct kvec iov[2]; + + if (tcon->unix_ext) { + /* + * SMB1 Unix Extensions: requires server support but + * works with all special files + */ + struct cifs_unix_set_info_args args = { + .mode = mode & ~current_umask(), + .ctime = NO_CHANGE_64, + .atime = NO_CHANGE_64, + .mtime = NO_CHANGE_64, + .device = dev, + }; + if (cifs_sb->mnt_cifs_flags & CIFS_MOUNT_SET_UID) { + args.uid = current_fsuid(); + args.gid = current_fsgid(); + } else { + args.uid = INVALID_UID; /* no change */ + args.gid = INVALID_GID; /* no change */ + } + rc = CIFSSMBUnixSetPathInfo(xid, tcon, full_path, &args, + cifs_sb->local_nls, + cifs_remap(cifs_sb)); + if (rc) + return rc; + + rc = cifs_get_inode_info_unix(&newinode, full_path, + inode->i_sb, xid); + + if (rc == 0) + d_instantiate(dentry, newinode); + return rc; + } + + /* + * SMB1 SFU emulation: should work with all servers, but only + * support block and char device (no socket & fifo) + */ + if (!(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_UNX_EMUL)) + return rc; + + if (!S_ISCHR(mode) && !S_ISBLK(mode)) + return rc; + + cifs_dbg(FYI, "sfu compat create special file\n"); + + oparms = (struct cifs_open_parms) { + .tcon = tcon, + .cifs_sb = cifs_sb, + .desired_access = GENERIC_WRITE, + .create_options = cifs_create_options(cifs_sb, CREATE_NOT_DIR | + CREATE_OPTION_SPECIAL), + .disposition = FILE_CREATE, + .path = full_path, + .fid = &fid, + }; + + if (tcon->ses->server->oplocks) + oplock = REQ_OPLOCK; + else + oplock = 0; + rc = tcon->ses->server->ops->open(xid, &oparms, &oplock, &buf); + if (rc) + return rc; + + /* + * BB Do not bother to decode buf since no local inode yet to put + * timestamps in, but we can reuse it safely. + */ + + pdev = (struct win_dev *)&buf.fi; + io_parms.pid = current->tgid; + io_parms.tcon = tcon; + io_parms.offset = 0; + io_parms.length = sizeof(struct win_dev); + iov[1].iov_base = &buf.fi; + iov[1].iov_len = sizeof(struct win_dev); + if (S_ISCHR(mode)) { + memcpy(pdev->type, "IntxCHR", 8); + pdev->major = cpu_to_le64(MAJOR(dev)); + pdev->minor = cpu_to_le64(MINOR(dev)); + rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, + &bytes_written, iov, 1); + } else if (S_ISBLK(mode)) { + memcpy(pdev->type, "IntxBLK", 8); + pdev->major = cpu_to_le64(MAJOR(dev)); + pdev->minor = cpu_to_le64(MINOR(dev)); + rc = tcon->ses->server->ops->sync_write(xid, &fid, &io_parms, + &bytes_written, iov, 1); + } + tcon->ses->server->ops->close(xid, tcon, &fid); + d_drop(dentry); + + /* FIXME: add code here to set EAs */ + + cifs_free_open_info(&buf); + return rc; +} + + + +struct smb_version_operations smb1_operations = { + .send_cancel = send_nt_cancel, + .compare_fids = cifs_compare_fids, + .setup_request = cifs_setup_request, + .setup_async_request = cifs_setup_async_request, + .check_receive = cifs_check_receive, + .add_credits = cifs_add_credits, + .set_credits = cifs_set_credits, + .get_credits_field = cifs_get_credits_field, + .get_credits = cifs_get_credits, + .wait_mtu_credits = cifs_wait_mtu_credits, + .get_next_mid = cifs_get_next_mid, + .read_data_offset = cifs_read_data_offset, + .read_data_length = cifs_read_data_length, + .map_error = map_smb_to_linux_error, + .find_mid = cifs_find_mid, + .check_message = checkSMB, + .dump_detail = cifs_dump_detail, + .clear_stats = cifs_clear_stats, + .print_stats = cifs_print_stats, + .is_oplock_break = is_valid_oplock_break, + .downgrade_oplock = cifs_downgrade_oplock, + .check_trans2 = cifs_check_trans2, + .need_neg = cifs_need_neg, + .negotiate = cifs_negotiate, + .negotiate_wsize = cifs_negotiate_wsize, + .negotiate_rsize = cifs_negotiate_rsize, + .sess_setup = CIFS_SessSetup, + .logoff = CIFSSMBLogoff, + .tree_connect = CIFSTCon, + .tree_disconnect = CIFSSMBTDis, + .get_dfs_refer = CIFSGetDFSRefer, + .qfs_tcon = cifs_qfs_tcon, + .is_path_accessible = cifs_is_path_accessible, + .can_echo = cifs_can_echo, + .query_path_info = cifs_query_path_info, + .query_file_info = cifs_query_file_info, + .get_srv_inum = cifs_get_srv_inum, + .set_path_size = CIFSSMBSetEOF, + .set_file_size = CIFSSMBSetFileSize, + .set_file_info = smb_set_file_info, + .set_compression = cifs_set_compression, + .echo = CIFSSMBEcho, + .mkdir = CIFSSMBMkDir, + .mkdir_setinfo = cifs_mkdir_setinfo, + .rmdir = CIFSSMBRmDir, + .unlink = CIFSSMBDelFile, + .rename_pending_delete = cifs_rename_pending_delete, + .rename = CIFSSMBRename, + .create_hardlink = CIFSCreateHardLink, + .query_symlink = cifs_query_symlink, + .open = cifs_open_file, + .set_fid = cifs_set_fid, + .close = cifs_close_file, + .flush = cifs_flush_file, + .async_readv = cifs_async_readv, + .async_writev = cifs_async_writev, + .sync_read = cifs_sync_read, + .sync_write = cifs_sync_write, + .query_dir_first = cifs_query_dir_first, + .query_dir_next = cifs_query_dir_next, + .close_dir = cifs_close_dir, + .calc_smb_size = smbCalcSize, + .oplock_response = cifs_oplock_response, + .queryfs = cifs_queryfs, + .mand_lock = cifs_mand_lock, + .mand_unlock_range = cifs_unlock_range, + .push_mand_locks = cifs_push_mandatory_locks, + .query_mf_symlink = cifs_query_mf_symlink, + .create_mf_symlink = cifs_create_mf_symlink, + .is_read_op = cifs_is_read_op, + .wp_retry_size = cifs_wp_retry_size, + .dir_needs_close = cifs_dir_needs_close, + .select_sectype = cifs_select_sectype, +#ifdef CONFIG_CIFS_XATTR + .query_all_EAs = CIFSSMBQAllEAs, + .set_EA = CIFSSMBSetEA, +#endif /* CIFS_XATTR */ + .get_acl = get_cifs_acl, + .get_acl_by_fid = get_cifs_acl_by_fid, + .set_acl = set_cifs_acl, + .make_node = cifs_make_node, +}; + +struct smb_version_values smb1_values = { + .version_string = SMB1_VERSION_STRING, + .protocol_id = SMB10_PROT_ID, + .large_lock_type = LOCKING_ANDX_LARGE_FILES, + .exclusive_lock_type = 0, + .shared_lock_type = LOCKING_ANDX_SHARED_LOCK, + .unlock_lock_type = 0, + .header_preamble_size = 4, + .header_size = sizeof(struct smb_hdr), + .max_header_size = MAX_CIFS_HDR_SIZE, + .read_rsp_size = sizeof(READ_RSP), + .lock_cmd = cpu_to_le16(SMB_COM_LOCKING_ANDX), + .cap_unix = CAP_UNIX, + .cap_nt_find = CAP_NT_SMBS | CAP_NT_FIND, + .cap_large_files = CAP_LARGE_FILES, + .signing_enabled = SECMODE_SIGN_ENABLED, + .signing_required = SECMODE_SIGN_REQUIRED, +}; |