[PATCH] [CIFS] SMB2 FSCTL and IOCTL worker function
Steve French
smfrench at gmail.com
Mon Jun 24 01:19:13 MDT 2013
This worker function is needed to send SMB2 fsctl (and ioctl) requests
including:
validating negotiation info (secure negotiate)
querying the servers network interfaces
copy offload (refcopy)
Followon patches for the above three will use this worker function.
Samba server implements
the first and third of these (Windows implements all three). As Ira
and I were discussing
we should probably add the simplest version of the query network
interfaces fsctl to
Samba server (to give out the link speed and ipv4 and ipv6 socket info
for the socket
the server is listening on)
(fsctl may also be needed eventually to request resiliency and work
with branch cache
among other tasks but that is farther in the future)
This patch also does general validation of the ioctl/fsctl response.
See MS-SMB2 Section 2.2.31
Signed-off-by: Steve French <smfrench at gmail.com>
---
fs/cifs/smb2misc.c | 4 ++
fs/cifs/smb2pdu.c | 114 ++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/smb2pdu.h | 23 +++++++++++
fs/cifs/smb2proto.h | 4 ++
4 files changed, 145 insertions(+)
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index 10383d8..b0c4334 100644
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -266,6 +266,10 @@ smb2_get_data_area_len(int *off, int *len, struct
smb2_hdr *hdr)
((struct smb2_query_directory_rsp *)hdr)->OutputBufferLength);
break;
case SMB2_IOCTL:
+ *off = le32_to_cpu(
+ ((struct smb2_ioctl_rsp *)hdr)->OutputOffset);
+ *len = le32_to_cpu(((struct smb2_ioctl_rsp *)hdr)->OutputCount);
+ break;
case SMB2_CHANGE_NOTIFY:
default:
/* BB FIXME for unimplemented cases above */
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 0de6a82..ebad80a 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -997,6 +997,120 @@ creat_exit:
return rc;
}
+/*
+ * SMB2 IOCTL is used for both IOCTLs and FSCTLs
+ */
+int
+SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon, u64 persistent_fid,
+ u64 volatile_fid, u32 opcode, bool is_fsctl, char *in_data,
+ u32 indatalen, char **out_data, u32 *plen /* returned data len */)
+{
+ struct smb2_ioctl_req *req;
+ struct smb2_ioctl_rsp *rsp;
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses = tcon->ses;
+ struct kvec iov[2];
+ int resp_buftype;
+ int num_iovecs;
+ int rc = 0;
+
+ cifs_dbg(FYI, "SMB2 IOCTL\n");
+
+ /* zero out returned data len, in case of error */
+ if (plen)
+ *plen = 0;
+
+ if (ses && (ses->server))
+ server = ses->server;
+ else
+ return -EIO;
+
+ rc = small_smb2_init(SMB2_IOCTL, tcon, (void **) &req);
+ if (rc)
+ return rc;
+
+ req->CtlCode = cpu_to_le32(opcode);
+ req->PersistentFileId = persistent_fid;
+ req->VolatileFileId = volatile_fid;
+
+ if (indatalen) {
+ req->InputCount = cpu_to_le32(indatalen);
+ /* do not set InputOffset if no input data */
+ req->InputOffset =
+ cpu_to_le32(offsetof(struct smb2_ioctl_req, Buffer) - 4);
+ iov[1].iov_base = in_data;
+ iov[1].iov_len = indatalen;
+ num_iovecs = 2;
+ } else
+ num_iovecs = 1;
+
+ req->OutputOffset = 0;
+ req->OutputCount = 0; /* MBZ */
+
+ /* Could increase MaxOutputResponse, but that would require
+ more than one credit. Windows typically sets this smaller, but for
+ some ioctls it may be useful to allow server to send more. No point
+ limiting what the server can send as long as fits in one credit */
+ req->MaxOutputResponse = cpu_to_le32(0xFF00); /* < 64K uses 1 credit */
+
+ if (is_fsctl)
+ req->Flags = cpu_to_le32(SMB2_0_IOCTL_IS_FSCTL);
+ else
+ req->Flags = 0;
+
+ iov[0].iov_base = (char *)req;
+ /* 4 for rfc1002 length field */
+ iov[0].iov_len = get_rfc1002_length(req) + 4;
+
+ if (indatalen)
+ inc_rfc1001_len(req, indatalen);
+
+ rc = SendReceive2(xid, ses, iov, num_iovecs, &resp_buftype, 0);
+ rsp = (struct smb2_ioctl_rsp *)iov[0].iov_base;
+
+ if (rc != 0) {
+ if (tcon)
+ cifs_stats_fail_inc(tcon, SMB2_IOCTL_HE);
+ goto ioctl_exit;
+ }
+
+ /* check if caller wants to look at return data or just return rc */
+ if ((plen == NULL) || (out_data == NULL))
+ goto ioctl_exit;
+
+ *plen = le32_to_cpu(rsp->OutputCount);
+
+ /* We check for obvious errors in the output buffer length and offset */
+ if (*plen == 0)
+ goto ioctl_exit; /* server returned no data */
+ else if (*plen > 0xFF00) {
+ cifs_dbg(VFS, "srv returned invalid ioctl length: %d\n", *plen);
+ *plen = 0;
+ rc = -EIO;
+ goto ioctl_exit;
+ }
+
+ if (get_rfc1002_length(rsp) < le32_to_cpu(rsp->OutputOffset) + *plen) {
+ cifs_dbg(VFS, "Malformed ioctl resp: len %d offset %d\n", *plen,
+ le32_to_cpu(rsp->OutputOffset));
+ *plen = 0;
+ rc = -EIO;
+ goto ioctl_exit;
+ }
+
+ *out_data = kmalloc(*plen, GFP_KERNEL);
+ if (*out_data == NULL) {
+ rc = -ENOMEM;
+ goto ioctl_exit;
+ }
+
+ memcpy(*out_data, rsp->hdr.ProtocolId + le32_to_cpu(rsp->OutputOffset),
+ *plen);
+ioctl_exit:
+ free_rsp_buf(resp_buftype, rsp);
+ return rc;
+}
+
int
SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_fid, u64 volatile_fid)
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index 0ef06ec..f31043b 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -497,6 +497,29 @@ struct copychunk_ioctl {
__u32 Reserved2;
} __packed;
+/* Response and Request are the same format */
+struct validate_negotiate_info {
+ __le32 Capabilities;
+ __u8 Guid[SMB2_CLIENT_GUID_SIZE];
+ __le16 SecurityMode;
+ __le16 DialectCount;
+ __le16 Dialect[1];
+} __packed;
+
+#define RSS_CAPABLE 0x00000001
+#define RDMA_CAPABLE 0x00000002
+
+struct network_interface_info_ioctl_rsp {
+ __le32 Next; /* next interface. zero if this is last one */
+ __le32 IfIndex;
+ __le32 Capability; /* RSS or RDMA Capable */
+ __le32 Reserved;
+ __le64 LinkSpeed;
+ char SockAddr_Storage[128];
+} __packed;
+
+#define NO_FILE_ID 0xFFFFFFFFFFFFFFFFULL /* general ioctls to srv not
to file */
+
struct smb2_ioctl_req {
struct smb2_hdr hdr;
__le16 StructureSize; /* Must be 57 */
diff --git a/fs/cifs/smb2proto.h b/fs/cifs/smb2proto.h
index 2aa3535..d4e1eb8 100644
--- a/fs/cifs/smb2proto.h
+++ b/fs/cifs/smb2proto.h
@@ -111,6 +111,10 @@ extern int SMB2_open(const unsigned int xid,
struct cifs_tcon *tcon,
__u32 desired_access, __u32 create_disposition,
__u32 file_attributes, __u32 create_options,
__u8 *oplock, struct smb2_file_all_info *buf);
+extern int SMB2_ioctl(const unsigned int xid, struct cifs_tcon *tcon,
+ u64 persistent_fid, u64 volatile_fid, u32 opcode,
+ bool is_fsctl, char *in_data, u32 indatalen,
+ char **out_data, u32 *plen /* returned data len */);
extern int SMB2_close(const unsigned int xid, struct cifs_tcon *tcon,
u64 persistent_file_id, u64 volatile_file_id);
extern int SMB2_flush(const unsigned int xid, struct cifs_tcon *tcon,
--
1.7.11.7
--
Thanks,
Steve
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