From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- fs/smb/client/smb2file.c | 371 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 371 insertions(+) create mode 100644 fs/smb/client/smb2file.c (limited to 'fs/smb/client/smb2file.c') diff --git a/fs/smb/client/smb2file.c b/fs/smb/client/smb2file.c new file mode 100644 index 000000000..a7475bc05 --- /dev/null +++ b/fs/smb/client/smb2file.c @@ -0,0 +1,371 @@ +// SPDX-License-Identifier: LGPL-2.1 +/* + * + * Copyright (C) International Business Machines Corp., 2002, 2011 + * Author(s): Steve French (sfrench@us.ibm.com), + * Pavel Shilovsky ((pshilovsky@samba.org) 2012 + * + */ +#include +#include +#include +#include +#include +#include "cifsfs.h" +#include "cifspdu.h" +#include "cifsglob.h" +#include "cifsproto.h" +#include "cifs_debug.h" +#include "cifs_fs_sb.h" +#include "cifs_unicode.h" +#include "fscache.h" +#include "smb2proto.h" +#include "smb2status.h" + +static struct smb2_symlink_err_rsp *symlink_data(const struct kvec *iov) +{ + struct smb2_err_rsp *err = iov->iov_base; + struct smb2_symlink_err_rsp *sym = ERR_PTR(-EINVAL); + u32 len; + + if (err->ErrorContextCount) { + struct smb2_error_context_rsp *p, *end; + + len = (u32)err->ErrorContextCount * (offsetof(struct smb2_error_context_rsp, + ErrorContextData) + + sizeof(struct smb2_symlink_err_rsp)); + if (le32_to_cpu(err->ByteCount) < len || iov->iov_len < len + sizeof(*err) + 1) + return ERR_PTR(-EINVAL); + + p = (struct smb2_error_context_rsp *)err->ErrorData; + end = (struct smb2_error_context_rsp *)((u8 *)err + iov->iov_len); + do { + if (le32_to_cpu(p->ErrorId) == SMB2_ERROR_ID_DEFAULT) { + sym = (struct smb2_symlink_err_rsp *)&p->ErrorContextData; + break; + } + cifs_dbg(FYI, "%s: skipping unhandled error context: 0x%x\n", + __func__, le32_to_cpu(p->ErrorId)); + + len = ALIGN(le32_to_cpu(p->ErrorDataLength), 8); + p = (struct smb2_error_context_rsp *)((u8 *)&p->ErrorContextData + len); + } while (p < end); + } else if (le32_to_cpu(err->ByteCount) >= sizeof(*sym) && + iov->iov_len >= SMB2_SYMLINK_STRUCT_SIZE) { + sym = (struct smb2_symlink_err_rsp *)err->ErrorData; + } + + if (!IS_ERR(sym) && (le32_to_cpu(sym->SymLinkErrorTag) != SYMLINK_ERROR_TAG || + le32_to_cpu(sym->ReparseTag) != IO_REPARSE_TAG_SYMLINK)) + sym = ERR_PTR(-EINVAL); + + return sym; +} + +int smb2_parse_symlink_response(struct cifs_sb_info *cifs_sb, const struct kvec *iov, char **path) +{ + struct smb2_symlink_err_rsp *sym; + unsigned int sub_offs, sub_len; + unsigned int print_offs, print_len; + char *s; + + if (!cifs_sb || !iov || !iov->iov_base || !iov->iov_len || !path) + return -EINVAL; + + sym = symlink_data(iov); + if (IS_ERR(sym)) + return PTR_ERR(sym); + + sub_len = le16_to_cpu(sym->SubstituteNameLength); + sub_offs = le16_to_cpu(sym->SubstituteNameOffset); + print_len = le16_to_cpu(sym->PrintNameLength); + print_offs = le16_to_cpu(sym->PrintNameOffset); + + if (iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offs + sub_len || + iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + print_offs + print_len) + return -EINVAL; + + s = cifs_strndup_from_utf16((char *)sym->PathBuffer + sub_offs, sub_len, true, + cifs_sb->local_nls); + if (!s) + return -ENOMEM; + convert_delimiter(s, '/'); + cifs_dbg(FYI, "%s: symlink target: %s\n", __func__, s); + + *path = s; + return 0; +} + +int smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, void *buf) +{ + int rc; + __le16 *smb2_path; + __u8 smb2_oplock; + struct cifs_open_info_data *data = buf; + struct smb2_file_all_info file_info = {}; + struct smb2_file_all_info *smb2_data = data ? &file_info : NULL; + struct kvec err_iov = {}; + int err_buftype = CIFS_NO_BUFFER; + struct cifs_fid *fid = oparms->fid; + struct network_resiliency_req nr_ioctl_req; + + smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb); + if (smb2_path == NULL) + return -ENOMEM; + + oparms->desired_access |= FILE_READ_ATTRIBUTES; + smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH; + + rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL, &err_iov, + &err_buftype); + if (rc && data) { + struct smb2_hdr *hdr = err_iov.iov_base; + + if (unlikely(!err_iov.iov_base || err_buftype == CIFS_NO_BUFFER)) + goto out; + if (hdr->Status == STATUS_STOPPED_ON_SYMLINK) { + rc = smb2_parse_symlink_response(oparms->cifs_sb, &err_iov, + &data->symlink_target); + if (!rc) { + memset(smb2_data, 0, sizeof(*smb2_data)); + oparms->create_options |= OPEN_REPARSE_POINT; + rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, + NULL, NULL, NULL); + oparms->create_options &= ~OPEN_REPARSE_POINT; + } + } + } + + if (rc) + goto out; + + if (oparms->tcon->use_resilient) { + /* default timeout is 0, servers pick default (120 seconds) */ + nr_ioctl_req.Timeout = + cpu_to_le32(oparms->tcon->handle_timeout); + nr_ioctl_req.Reserved = 0; + rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid, + fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY, + (char *)&nr_ioctl_req, sizeof(nr_ioctl_req), + CIFSMaxBufSize, NULL, NULL /* no return info */); + if (rc == -EOPNOTSUPP) { + cifs_dbg(VFS, + "resiliency not supported by server, disabling\n"); + oparms->tcon->use_resilient = false; + } else if (rc) + cifs_dbg(FYI, "error %d setting resiliency\n", rc); + + rc = 0; + } + + if (smb2_data) { + /* if open response does not have IndexNumber field - get it */ + if (smb2_data->IndexNumber == 0) { + rc = SMB2_get_srv_num(xid, oparms->tcon, + fid->persistent_fid, + fid->volatile_fid, + &smb2_data->IndexNumber); + if (rc) { + /* + * let get_inode_info disable server inode + * numbers + */ + smb2_data->IndexNumber = 0; + rc = 0; + } + } + memcpy(&data->fi, smb2_data, sizeof(data->fi)); + } + + *oplock = smb2_oplock; +out: + free_rsp_buf(err_buftype, err_iov.iov_base); + kfree(smb2_path); + return rc; +} + +int +smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock, + const unsigned int xid) +{ + int rc = 0, stored_rc; + unsigned int max_num, num = 0, max_buf; + struct smb2_lock_element *buf, *cur; + struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); + struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); + struct cifsLockInfo *li, *tmp; + __u64 length = 1 + flock->fl_end - flock->fl_start; + struct list_head tmp_llist; + + INIT_LIST_HEAD(&tmp_llist); + + /* + * Accessing maxBuf is racy with cifs_reconnect - need to store value + * and check it before using. + */ + max_buf = tcon->ses->server->maxBuf; + if (max_buf < sizeof(struct smb2_lock_element)) + return -EINVAL; + + BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE); + max_buf = min_t(unsigned int, max_buf, PAGE_SIZE); + max_num = max_buf / sizeof(struct smb2_lock_element); + buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL); + if (!buf) + return -ENOMEM; + + cur = buf; + + cifs_down_write(&cinode->lock_sem); + list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) { + if (flock->fl_start > li->offset || + (flock->fl_start + length) < + (li->offset + li->length)) + continue; + if (current->tgid != li->pid) + /* + * flock and OFD lock are associated with an open + * file description, not the process. + */ + if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK))) + continue; + if (cinode->can_cache_brlcks) { + /* + * We can cache brlock requests - simply remove a lock + * from the file's list. + */ + list_del(&li->llist); + cifs_del_lock_waiters(li); + kfree(li); + continue; + } + cur->Length = cpu_to_le64(li->length); + cur->Offset = cpu_to_le64(li->offset); + cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK); + /* + * We need to save a lock here to let us add it again to the + * file's list if the unlock range request fails on the server. + */ + list_move(&li->llist, &tmp_llist); + if (++num == max_num) { + stored_rc = smb2_lockv(xid, tcon, + cfile->fid.persistent_fid, + cfile->fid.volatile_fid, + current->tgid, num, buf); + if (stored_rc) { + /* + * We failed on the unlock range request - add + * all locks from the tmp list to the head of + * the file's list. + */ + cifs_move_llist(&tmp_llist, + &cfile->llist->locks); + rc = stored_rc; + } else + /* + * The unlock range request succeed - free the + * tmp list. + */ + cifs_free_llist(&tmp_llist); + cur = buf; + num = 0; + } else + cur++; + } + if (num) { + stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid, + cfile->fid.volatile_fid, current->tgid, + num, buf); + if (stored_rc) { + cifs_move_llist(&tmp_llist, &cfile->llist->locks); + rc = stored_rc; + } else + cifs_free_llist(&tmp_llist); + } + up_write(&cinode->lock_sem); + + kfree(buf); + return rc; +} + +static int +smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid, + struct smb2_lock_element *buf, unsigned int max_num) +{ + int rc = 0, stored_rc; + struct cifsFileInfo *cfile = fdlocks->cfile; + struct cifsLockInfo *li; + unsigned int num = 0; + struct smb2_lock_element *cur = buf; + struct cifs_tcon *tcon = tlink_tcon(cfile->tlink); + + list_for_each_entry(li, &fdlocks->locks, llist) { + cur->Length = cpu_to_le64(li->length); + cur->Offset = cpu_to_le64(li->offset); + cur->Flags = cpu_to_le32(li->type | + SMB2_LOCKFLAG_FAIL_IMMEDIATELY); + if (++num == max_num) { + stored_rc = smb2_lockv(xid, tcon, + cfile->fid.persistent_fid, + cfile->fid.volatile_fid, + current->tgid, num, buf); + if (stored_rc) + rc = stored_rc; + cur = buf; + num = 0; + } else + cur++; + } + if (num) { + stored_rc = smb2_lockv(xid, tcon, + cfile->fid.persistent_fid, + cfile->fid.volatile_fid, + current->tgid, num, buf); + if (stored_rc) + rc = stored_rc; + } + + return rc; +} + +int +smb2_push_mandatory_locks(struct cifsFileInfo *cfile) +{ + int rc = 0, stored_rc; + unsigned int xid; + unsigned int max_num, max_buf; + struct smb2_lock_element *buf; + struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry)); + struct cifs_fid_locks *fdlocks; + + xid = get_xid(); + + /* + * Accessing maxBuf is racy with cifs_reconnect - need to store value + * and check it for zero before using. + */ + max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf; + if (max_buf < sizeof(struct smb2_lock_element)) { + free_xid(xid); + return -EINVAL; + } + + BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE); + max_buf = min_t(unsigned int, max_buf, PAGE_SIZE); + max_num = max_buf / sizeof(struct smb2_lock_element); + buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL); + if (!buf) { + free_xid(xid); + return -ENOMEM; + } + + list_for_each_entry(fdlocks, &cinode->llist, llist) { + stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num); + if (stored_rc) + rc = stored_rc; + } + + kfree(buf); + free_xid(xid); + return rc; +} -- cgit v1.2.3