diff options
Diffstat (limited to 'fs/cifs/smb2ops.c')
| -rw-r--r-- | fs/cifs/smb2ops.c | 110 |
1 files changed, 99 insertions, 11 deletions
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 4313cb04549e..a930c8965e5c 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -2390,46 +2390,129 @@ smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses, static int smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, - const char *full_path, char **target_path, - struct cifs_sb_info *cifs_sb) + struct cifs_sb_info *cifs_sb, const char *full_path, + char **target_path, bool is_reparse_point) { int rc; - __le16 *utf16_path; + __le16 *utf16_path = NULL; __u8 oplock = SMB2_OPLOCK_LEVEL_NONE; struct cifs_open_parms oparms; struct cifs_fid fid; struct kvec err_iov = {NULL, 0}; struct smb2_err_rsp *err_buf = NULL; - int resp_buftype; struct smb2_symlink_err_rsp *symlink; unsigned int sub_len; unsigned int sub_offset; unsigned int print_len; unsigned int print_offset; + int flags = 0; + struct smb_rqst rqst[3]; + int resp_buftype[3]; + struct kvec rsp_iov[3]; + struct kvec open_iov[SMB2_CREATE_IOV_SIZE]; + struct kvec io_iov[SMB2_IOCTL_IOV_SIZE]; + struct kvec close_iov[1]; + struct smb2_create_rsp *create_rsp; + struct smb2_ioctl_rsp *ioctl_rsp; + char *ioctl_buf; + u32 plen; cifs_dbg(FYI, "%s: path: %s\n", __func__, full_path); + if (smb3_encryption_required(tcon)) + flags |= CIFS_TRANSFORM_REQ; + + memset(rqst, 0, sizeof(rqst)); + resp_buftype[0] = resp_buftype[1] = resp_buftype[2] = CIFS_NO_BUFFER; + memset(rsp_iov, 0, sizeof(rsp_iov)); + utf16_path = cifs_convert_path_to_utf16(full_path, cifs_sb); if (!utf16_path) return -ENOMEM; + /* Open */ + memset(&open_iov, 0, sizeof(open_iov)); + rqst[0].rq_iov = open_iov; + rqst[0].rq_nvec = SMB2_CREATE_IOV_SIZE; + + memset(&oparms, 0, sizeof(oparms)); oparms.tcon = tcon; oparms.desired_access = FILE_READ_ATTRIBUTES; oparms.disposition = FILE_OPEN; + if (backup_cred(cifs_sb)) oparms.create_options = CREATE_OPEN_BACKUP_INTENT; else oparms.create_options = 0; + if (is_reparse_point) + oparms.create_options = OPEN_REPARSE_POINT; + oparms.fid = &fid; oparms.reconnect = false; - rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, &err_iov, - &resp_buftype); - if (!rc) - SMB2_close(xid, tcon, fid.persistent_fid, fid.volatile_fid); + rc = SMB2_open_init(tcon, &rqst[0], &oplock, &oparms, utf16_path); + if (rc) + goto querty_exit; + smb2_set_next_command(tcon, &rqst[0]); + + + /* IOCTL */ + memset(&io_iov, 0, sizeof(io_iov)); + rqst[1].rq_iov = io_iov; + rqst[1].rq_nvec = SMB2_IOCTL_IOV_SIZE; + + rc = SMB2_ioctl_init(tcon, &rqst[1], fid.persistent_fid, + fid.volatile_fid, FSCTL_GET_REPARSE_POINT, + true /* is_fctl */, NULL, 0, CIFSMaxBufSize); + if (rc) + goto querty_exit; + + smb2_set_next_command(tcon, &rqst[1]); + smb2_set_related(&rqst[1]); + + + /* Close */ + memset(&close_iov, 0, sizeof(close_iov)); + rqst[2].rq_iov = close_iov; + rqst[2].rq_nvec = 1; + + rc = SMB2_close_init(tcon, &rqst[2], COMPOUND_FID, COMPOUND_FID); + if (rc) + goto querty_exit; + + smb2_set_related(&rqst[2]); + + rc = compound_send_recv(xid, tcon->ses, flags, 3, rqst, + resp_buftype, rsp_iov); + + create_rsp = rsp_iov[0].iov_base; + if (create_rsp && create_rsp->sync_hdr.Status) + err_iov = rsp_iov[0]; + ioctl_rsp = rsp_iov[1].iov_base; + + /* + * Open was successful and we got an ioctl response. + */ + if ((rc == 0) && (is_reparse_point)) { + /* See MS-FSCC 2.3.23 */ + + ioctl_buf = (char *)ioctl_rsp + le32_to_cpu(ioctl_rsp->OutputOffset); + plen = le32_to_cpu(ioctl_rsp->OutputCount); + + if (plen + le32_to_cpu(ioctl_rsp->OutputOffset) > + rsp_iov[1].iov_len) { + cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", plen); + rc = -EIO; + goto querty_exit; + } + + /* Do stuff with ioctl_buf/plen */ + goto querty_exit; + } + if (!rc || !err_iov.iov_base) { rc = -ENOENT; - goto free_path; + goto querty_exit; } err_buf = err_iov.iov_base; @@ -2469,9 +2552,14 @@ smb2_query_symlink(const unsigned int xid, struct cifs_tcon *tcon, cifs_dbg(FYI, "%s: target path: %s\n", __func__, *target_path); querty_exit: - free_rsp_buf(resp_buftype, err_buf); - free_path: + cifs_dbg(FYI, "query symlink rc %d\n", rc); kfree(utf16_path); + SMB2_open_free(&rqst[0]); + SMB2_ioctl_free(&rqst[1]); + SMB2_close_free(&rqst[2]); + free_rsp_buf(resp_buftype[0], rsp_iov[0].iov_base); + free_rsp_buf(resp_buftype[1], rsp_iov[1].iov_base); + free_rsp_buf(resp_buftype[2], rsp_iov[2].iov_base); return rc; } |