373 lines
10 KiB
C
373 lines
10 KiB
C
// SPDX-License-Identifier: LGPL-2.1
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/*
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*
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* Copyright (C) International Business Machines Corp., 2002, 2011
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* Author(s): Steve French (sfrench@us.ibm.com),
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* Pavel Shilovsky ((pshilovsky@samba.org) 2012
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*
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*/
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#include <linux/fs.h>
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#include <linux/filelock.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/pagemap.h>
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#include <asm/div64.h>
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#include "cifsfs.h"
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#include "cifspdu.h"
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#include "cifsglob.h"
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#include "cifsproto.h"
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#include "cifs_debug.h"
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#include "cifs_fs_sb.h"
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#include "cifs_unicode.h"
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#include "fscache.h"
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#include "smb2proto.h"
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#include "smb2status.h"
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static struct smb2_symlink_err_rsp *symlink_data(const struct kvec *iov)
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{
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struct smb2_err_rsp *err = iov->iov_base;
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struct smb2_symlink_err_rsp *sym = ERR_PTR(-EINVAL);
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u32 len;
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if (err->ErrorContextCount) {
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struct smb2_error_context_rsp *p, *end;
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len = (u32)err->ErrorContextCount * (offsetof(struct smb2_error_context_rsp,
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ErrorContextData) +
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sizeof(struct smb2_symlink_err_rsp));
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if (le32_to_cpu(err->ByteCount) < len || iov->iov_len < len + sizeof(*err) + 1)
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return ERR_PTR(-EINVAL);
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p = (struct smb2_error_context_rsp *)err->ErrorData;
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end = (struct smb2_error_context_rsp *)((u8 *)err + iov->iov_len);
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do {
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if (le32_to_cpu(p->ErrorId) == SMB2_ERROR_ID_DEFAULT) {
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sym = (struct smb2_symlink_err_rsp *)&p->ErrorContextData;
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break;
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}
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cifs_dbg(FYI, "%s: skipping unhandled error context: 0x%x\n",
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__func__, le32_to_cpu(p->ErrorId));
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len = ALIGN(le32_to_cpu(p->ErrorDataLength), 8);
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p = (struct smb2_error_context_rsp *)((u8 *)&p->ErrorContextData + len);
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} while (p < end);
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} else if (le32_to_cpu(err->ByteCount) >= sizeof(*sym) &&
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iov->iov_len >= SMB2_SYMLINK_STRUCT_SIZE) {
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sym = (struct smb2_symlink_err_rsp *)err->ErrorData;
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}
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if (!IS_ERR(sym) && (le32_to_cpu(sym->SymLinkErrorTag) != SYMLINK_ERROR_TAG ||
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le32_to_cpu(sym->ReparseTag) != IO_REPARSE_TAG_SYMLINK))
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sym = ERR_PTR(-EINVAL);
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return sym;
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}
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int smb2_parse_symlink_response(struct cifs_sb_info *cifs_sb, const struct kvec *iov, char **path)
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{
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struct smb2_symlink_err_rsp *sym;
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unsigned int sub_offs, sub_len;
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unsigned int print_offs, print_len;
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char *s;
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if (!cifs_sb || !iov || !iov->iov_base || !iov->iov_len || !path)
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return -EINVAL;
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sym = symlink_data(iov);
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if (IS_ERR(sym))
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return PTR_ERR(sym);
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sub_len = le16_to_cpu(sym->SubstituteNameLength);
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sub_offs = le16_to_cpu(sym->SubstituteNameOffset);
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print_len = le16_to_cpu(sym->PrintNameLength);
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print_offs = le16_to_cpu(sym->PrintNameOffset);
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if (iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offs + sub_len ||
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iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + print_offs + print_len)
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return -EINVAL;
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s = cifs_strndup_from_utf16((char *)sym->PathBuffer + sub_offs, sub_len, true,
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cifs_sb->local_nls);
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if (!s)
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return -ENOMEM;
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convert_delimiter(s, '/');
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cifs_dbg(FYI, "%s: symlink target: %s\n", __func__, s);
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*path = s;
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return 0;
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}
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int smb2_open_file(const unsigned int xid, struct cifs_open_parms *oparms, __u32 *oplock, void *buf)
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{
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int rc;
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__le16 *smb2_path;
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__u8 smb2_oplock;
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struct cifs_open_info_data *data = buf;
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struct smb2_file_all_info file_info = {};
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struct smb2_file_all_info *smb2_data = data ? &file_info : NULL;
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struct kvec err_iov = {};
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int err_buftype = CIFS_NO_BUFFER;
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struct cifs_fid *fid = oparms->fid;
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struct network_resiliency_req nr_ioctl_req;
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smb2_path = cifs_convert_path_to_utf16(oparms->path, oparms->cifs_sb);
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if (smb2_path == NULL)
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return -ENOMEM;
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oparms->desired_access |= FILE_READ_ATTRIBUTES;
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smb2_oplock = SMB2_OPLOCK_LEVEL_BATCH;
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rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data, NULL, &err_iov,
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&err_buftype);
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if (rc && data) {
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struct smb2_hdr *hdr = err_iov.iov_base;
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if (unlikely(!err_iov.iov_base || err_buftype == CIFS_NO_BUFFER))
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goto out;
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if (hdr->Status == STATUS_STOPPED_ON_SYMLINK) {
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rc = smb2_parse_symlink_response(oparms->cifs_sb, &err_iov,
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&data->symlink_target);
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if (!rc) {
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memset(smb2_data, 0, sizeof(*smb2_data));
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oparms->create_options |= OPEN_REPARSE_POINT;
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rc = SMB2_open(xid, oparms, smb2_path, &smb2_oplock, smb2_data,
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NULL, NULL, NULL);
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oparms->create_options &= ~OPEN_REPARSE_POINT;
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}
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}
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}
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if (rc)
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goto out;
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if (oparms->tcon->use_resilient) {
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/* default timeout is 0, servers pick default (120 seconds) */
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nr_ioctl_req.Timeout =
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cpu_to_le32(oparms->tcon->handle_timeout);
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nr_ioctl_req.Reserved = 0;
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rc = SMB2_ioctl(xid, oparms->tcon, fid->persistent_fid,
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fid->volatile_fid, FSCTL_LMR_REQUEST_RESILIENCY,
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(char *)&nr_ioctl_req, sizeof(nr_ioctl_req),
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CIFSMaxBufSize, NULL, NULL /* no return info */);
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if (rc == -EOPNOTSUPP) {
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cifs_dbg(VFS,
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"resiliency not supported by server, disabling\n");
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oparms->tcon->use_resilient = false;
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} else if (rc)
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cifs_dbg(FYI, "error %d setting resiliency\n", rc);
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rc = 0;
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}
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if (smb2_data) {
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/* if open response does not have IndexNumber field - get it */
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if (smb2_data->IndexNumber == 0) {
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rc = SMB2_get_srv_num(xid, oparms->tcon,
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fid->persistent_fid,
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fid->volatile_fid,
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&smb2_data->IndexNumber);
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if (rc) {
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/*
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* let get_inode_info disable server inode
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* numbers
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*/
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smb2_data->IndexNumber = 0;
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rc = 0;
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}
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}
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memcpy(&data->fi, smb2_data, sizeof(data->fi));
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}
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*oplock = smb2_oplock;
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out:
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free_rsp_buf(err_buftype, err_iov.iov_base);
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kfree(smb2_path);
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return rc;
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}
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int
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smb2_unlock_range(struct cifsFileInfo *cfile, struct file_lock *flock,
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const unsigned int xid)
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{
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int rc = 0, stored_rc;
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unsigned int max_num, num = 0, max_buf;
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struct smb2_lock_element *buf, *cur;
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struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
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struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
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struct cifsLockInfo *li, *tmp;
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__u64 length = 1 + flock->fl_end - flock->fl_start;
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struct list_head tmp_llist;
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INIT_LIST_HEAD(&tmp_llist);
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/*
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* Accessing maxBuf is racy with cifs_reconnect - need to store value
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* and check it before using.
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*/
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max_buf = tcon->ses->server->maxBuf;
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if (max_buf < sizeof(struct smb2_lock_element))
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return -EINVAL;
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BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
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max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
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max_num = max_buf / sizeof(struct smb2_lock_element);
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buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
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if (!buf)
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return -ENOMEM;
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cur = buf;
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cifs_down_write(&cinode->lock_sem);
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list_for_each_entry_safe(li, tmp, &cfile->llist->locks, llist) {
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if (flock->fl_start > li->offset ||
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(flock->fl_start + length) <
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(li->offset + li->length))
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continue;
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if (current->tgid != li->pid)
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/*
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* flock and OFD lock are associated with an open
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* file description, not the process.
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*/
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if (!(flock->fl_flags & (FL_FLOCK | FL_OFDLCK)))
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continue;
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if (cinode->can_cache_brlcks) {
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/*
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* We can cache brlock requests - simply remove a lock
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* from the file's list.
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*/
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list_del(&li->llist);
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cifs_del_lock_waiters(li);
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kfree(li);
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continue;
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}
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cur->Length = cpu_to_le64(li->length);
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cur->Offset = cpu_to_le64(li->offset);
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cur->Flags = cpu_to_le32(SMB2_LOCKFLAG_UNLOCK);
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/*
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* We need to save a lock here to let us add it again to the
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* file's list if the unlock range request fails on the server.
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*/
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list_move(&li->llist, &tmp_llist);
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if (++num == max_num) {
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stored_rc = smb2_lockv(xid, tcon,
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cfile->fid.persistent_fid,
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cfile->fid.volatile_fid,
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current->tgid, num, buf);
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if (stored_rc) {
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/*
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* We failed on the unlock range request - add
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* all locks from the tmp list to the head of
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* the file's list.
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*/
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cifs_move_llist(&tmp_llist,
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&cfile->llist->locks);
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rc = stored_rc;
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} else
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/*
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* The unlock range request succeed - free the
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* tmp list.
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*/
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cifs_free_llist(&tmp_llist);
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cur = buf;
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num = 0;
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} else
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cur++;
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}
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if (num) {
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stored_rc = smb2_lockv(xid, tcon, cfile->fid.persistent_fid,
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cfile->fid.volatile_fid, current->tgid,
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num, buf);
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if (stored_rc) {
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cifs_move_llist(&tmp_llist, &cfile->llist->locks);
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rc = stored_rc;
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} else
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cifs_free_llist(&tmp_llist);
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}
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up_write(&cinode->lock_sem);
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kfree(buf);
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return rc;
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}
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static int
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smb2_push_mand_fdlocks(struct cifs_fid_locks *fdlocks, const unsigned int xid,
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struct smb2_lock_element *buf, unsigned int max_num)
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{
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int rc = 0, stored_rc;
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struct cifsFileInfo *cfile = fdlocks->cfile;
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struct cifsLockInfo *li;
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unsigned int num = 0;
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struct smb2_lock_element *cur = buf;
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struct cifs_tcon *tcon = tlink_tcon(cfile->tlink);
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list_for_each_entry(li, &fdlocks->locks, llist) {
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cur->Length = cpu_to_le64(li->length);
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cur->Offset = cpu_to_le64(li->offset);
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cur->Flags = cpu_to_le32(li->type |
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SMB2_LOCKFLAG_FAIL_IMMEDIATELY);
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if (++num == max_num) {
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stored_rc = smb2_lockv(xid, tcon,
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cfile->fid.persistent_fid,
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cfile->fid.volatile_fid,
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current->tgid, num, buf);
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if (stored_rc)
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rc = stored_rc;
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cur = buf;
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num = 0;
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} else
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cur++;
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}
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if (num) {
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stored_rc = smb2_lockv(xid, tcon,
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cfile->fid.persistent_fid,
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cfile->fid.volatile_fid,
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current->tgid, num, buf);
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if (stored_rc)
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rc = stored_rc;
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}
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return rc;
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}
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int
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smb2_push_mandatory_locks(struct cifsFileInfo *cfile)
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{
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int rc = 0, stored_rc;
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unsigned int xid;
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unsigned int max_num, max_buf;
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struct smb2_lock_element *buf;
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struct cifsInodeInfo *cinode = CIFS_I(d_inode(cfile->dentry));
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struct cifs_fid_locks *fdlocks;
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xid = get_xid();
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/*
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* Accessing maxBuf is racy with cifs_reconnect - need to store value
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* and check it for zero before using.
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*/
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max_buf = tlink_tcon(cfile->tlink)->ses->server->maxBuf;
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if (max_buf < sizeof(struct smb2_lock_element)) {
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free_xid(xid);
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return -EINVAL;
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}
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BUILD_BUG_ON(sizeof(struct smb2_lock_element) > PAGE_SIZE);
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max_buf = min_t(unsigned int, max_buf, PAGE_SIZE);
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max_num = max_buf / sizeof(struct smb2_lock_element);
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buf = kcalloc(max_num, sizeof(struct smb2_lock_element), GFP_KERNEL);
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if (!buf) {
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free_xid(xid);
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return -ENOMEM;
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}
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list_for_each_entry(fdlocks, &cinode->llist, llist) {
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stored_rc = smb2_push_mand_fdlocks(fdlocks, xid, buf, max_num);
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if (stored_rc)
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rc = stored_rc;
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}
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kfree(buf);
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free_xid(xid);
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return rc;
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}
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