CIFS: Add tree connect/disconnect capability for SMB2
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 2165f0d..1bf037e 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -110,8 +110,8 @@
hdr->SessionId = tcon->ses->Suid;
/* BB check following DFS flags BB */
/* BB do we have to add check for SHI1005_FLAGS_DFS_ROOT too? */
- /* if (tcon->share_flags & SHI1005_FLAGS_DFS)
- hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS; */
+ if (tcon->share_flags & SHI1005_FLAGS_DFS)
+ hdr->Flags |= SMB2_FLAGS_DFS_OPERATIONS;
/* BB how does SMB2 do case sensitive? */
/* if (tcon->nocase)
hdr->Flags |= SMBFLG_CASELESS; */
@@ -549,3 +549,158 @@
*/
return rc;
}
+
+static inline void cifs_stats_fail_inc(struct cifs_tcon *tcon, uint16_t code)
+{
+ /* cifs_stats_inc(&tcon->stats.smb2_stats.smb2_com_fail[code]); */
+}
+
+#define MAX_SHARENAME_LENGTH (255 /* server */ + 80 /* share */ + 1 /* NULL */)
+
+int
+SMB2_tcon(const unsigned int xid, struct cifs_ses *ses, const char *tree,
+ struct cifs_tcon *tcon, const struct nls_table *cp)
+{
+ struct smb2_tree_connect_req *req;
+ struct smb2_tree_connect_rsp *rsp = NULL;
+ struct kvec iov[2];
+ int rc = 0;
+ int resp_buftype;
+ int unc_path_len;
+ struct TCP_Server_Info *server;
+ __le16 *unc_path = NULL;
+
+ cFYI(1, "TCON");
+
+ if ((ses->server) && tree)
+ server = ses->server;
+ else
+ return -EIO;
+
+ if (tcon && tcon->bad_network_name)
+ return -ENOENT;
+
+ unc_path = kmalloc(MAX_SHARENAME_LENGTH * 2, GFP_KERNEL);
+ if (unc_path == NULL)
+ return -ENOMEM;
+
+ unc_path_len = cifs_strtoUTF16(unc_path, tree, strlen(tree), cp) + 1;
+ unc_path_len *= 2;
+ if (unc_path_len < 2) {
+ kfree(unc_path);
+ return -EINVAL;
+ }
+
+ rc = small_smb2_init(SMB2_TREE_CONNECT, tcon, (void **) &req);
+ if (rc) {
+ kfree(unc_path);
+ return rc;
+ }
+
+ if (tcon == NULL) {
+ /* since no tcon, smb2_init can not do this, so do here */
+ req->hdr.SessionId = ses->Suid;
+ /* if (ses->server->sec_mode & SECMODE_SIGN_REQUIRED)
+ req->hdr.Flags |= SMB2_FLAGS_SIGNED; */
+ }
+
+ iov[0].iov_base = (char *)req;
+ /* 4 for rfc1002 length field and 1 for pad */
+ iov[0].iov_len = get_rfc1002_length(req) + 4 - 1;
+
+ /* Testing shows that buffer offset must be at location of Buffer[0] */
+ req->PathOffset = cpu_to_le16(sizeof(struct smb2_tree_connect_req)
+ - 1 /* pad */ - 4 /* do not count rfc1001 len field */);
+ req->PathLength = cpu_to_le16(unc_path_len - 2);
+ iov[1].iov_base = unc_path;
+ iov[1].iov_len = unc_path_len;
+
+ inc_rfc1001_len(req, unc_path_len - 1 /* pad */);
+
+ rc = SendReceive2(xid, ses, iov, 2, &resp_buftype, 0);
+ rsp = (struct smb2_tree_connect_rsp *)iov[0].iov_base;
+
+ if (rc != 0) {
+ if (tcon) {
+ cifs_stats_fail_inc(tcon, SMB2_TREE_CONNECT_HE);
+ tcon->need_reconnect = true;
+ }
+ goto tcon_error_exit;
+ }
+
+ if (rsp == NULL) {
+ rc = -EIO;
+ goto tcon_exit;
+ }
+
+ if (tcon == NULL) {
+ ses->ipc_tid = rsp->hdr.TreeId;
+ goto tcon_exit;
+ }
+
+ if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
+ cFYI(1, "connection to disk share");
+ else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
+ tcon->ipc = true;
+ cFYI(1, "connection to pipe share");
+ } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
+ tcon->print = true;
+ cFYI(1, "connection to printer");
+ } else {
+ cERROR(1, "unknown share type %d", rsp->ShareType);
+ rc = -EOPNOTSUPP;
+ goto tcon_error_exit;
+ }
+
+ tcon->share_flags = le32_to_cpu(rsp->ShareFlags);
+ tcon->maximal_access = le32_to_cpu(rsp->MaximalAccess);
+ tcon->tidStatus = CifsGood;
+ tcon->need_reconnect = false;
+ tcon->tid = rsp->hdr.TreeId;
+ strncpy(tcon->treeName, tree, MAX_TREE_SIZE);
+
+ if ((rsp->Capabilities & SMB2_SHARE_CAP_DFS) &&
+ ((tcon->share_flags & SHI1005_FLAGS_DFS) == 0))
+ cERROR(1, "DFS capability contradicts DFS flag");
+
+tcon_exit:
+ free_rsp_buf(resp_buftype, rsp);
+ kfree(unc_path);
+ return rc;
+
+tcon_error_exit:
+ if (rsp->hdr.Status == STATUS_BAD_NETWORK_NAME) {
+ cERROR(1, "BAD_NETWORK_NAME: %s", tree);
+ tcon->bad_network_name = true;
+ }
+ goto tcon_exit;
+}
+
+int
+SMB2_tdis(const unsigned int xid, struct cifs_tcon *tcon)
+{
+ struct smb2_tree_disconnect_req *req; /* response is trivial */
+ int rc = 0;
+ struct TCP_Server_Info *server;
+ struct cifs_ses *ses = tcon->ses;
+
+ cFYI(1, "Tree Disconnect");
+
+ if (ses && (ses->server))
+ server = ses->server;
+ else
+ return -EIO;
+
+ if ((tcon->need_reconnect) || (tcon->ses->need_reconnect))
+ return 0;
+
+ rc = small_smb2_init(SMB2_TREE_DISCONNECT, tcon, (void **) &req);
+ if (rc)
+ return rc;
+
+ rc = SendReceiveNoRsp(xid, ses, (char *)&req->hdr, 0);
+ if (rc)
+ cifs_stats_fail_inc(tcon, SMB2_TREE_DISCONNECT_HE);
+
+ return rc;
+}