+/* parses DFS refferal V3 structure
+ * caller is responsible for freeing target_nodes
+ * returns:
+ * on success - 0
+ * on failure - errno
+ */
+static int
+parse_DFS_referrals(TRANSACTION2_GET_DFS_REFER_RSP *pSMBr,
+ unsigned int *num_of_nodes,
+ struct dfs_info3_param **target_nodes,
+ const struct nls_table *nls_codepage)
+{
+ int i, rc = 0;
+ char *data_end;
+ bool is_unicode;
+ struct dfs_referral_level_3 *ref;
+
+ is_unicode = pSMBr->hdr.Flags2 & SMBFLG2_UNICODE;
+ *num_of_nodes = le16_to_cpu(pSMBr->NumberOfReferrals);
+
+ if (*num_of_nodes < 1) {
+ cERROR(1, ("num_referrals: must be at least > 0,"
+ "but we get num_referrals = %d\n", *num_of_nodes));
+ rc = -EINVAL;
+ goto parse_DFS_referrals_exit;
+ }
+
+ ref = (struct dfs_referral_level_3 *) &(pSMBr->referrals);
+ if (ref->VersionNumber != cpu_to_le16(3)) {
+ cERROR(1, ("Referrals of V%d version are not supported,"
+ "should be V3", le16_to_cpu(ref->VersionNumber)));
+ rc = -EINVAL;
+ goto parse_DFS_referrals_exit;
+ }
+
+ /* get the upper boundary of the resp buffer */
+ data_end = (char *)(&(pSMBr->PathConsumed)) +
+ le16_to_cpu(pSMBr->t2.DataCount);
+
+ cFYI(1, ("num_referrals: %d dfs flags: 0x%x ... \n",
+ *num_of_nodes,
+ le16_to_cpu(pSMBr->DFSFlags)));
+
+ *target_nodes = kzalloc(sizeof(struct dfs_info3_param) *
+ *num_of_nodes, GFP_KERNEL);
+ if (*target_nodes == NULL) {
+ cERROR(1, ("Failed to allocate buffer for target_nodes\n"));
+ rc = -ENOMEM;
+ goto parse_DFS_referrals_exit;
+ }
+
+ /* collect neccessary data from referrals */
+ for (i = 0; i < *num_of_nodes; i++) {
+ char *temp;
+ int max_len;
+ struct dfs_info3_param *node = (*target_nodes)+i;
+
+ node->flags = le16_to_cpu(pSMBr->DFSFlags);
+ node->path_consumed = le16_to_cpu(pSMBr->PathConsumed);
+ node->server_type = le16_to_cpu(ref->ServerType);
+ node->ref_flag = le16_to_cpu(ref->ReferralEntryFlags);
+
+ /* copy DfsPath */
+ temp = (char *)ref + le16_to_cpu(ref->DfsPathOffset);
+ max_len = data_end - temp;
+ rc = cifs_strncpy_to_host(&(node->path_name), temp,
+ max_len, is_unicode, nls_codepage);
+ if (rc)
+ goto parse_DFS_referrals_exit;
+
+ /* copy link target UNC */
+ temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
+ max_len = data_end - temp;
+ rc = cifs_strncpy_to_host(&(node->node_name), temp,
+ max_len, is_unicode, nls_codepage);
+ if (rc)
+ goto parse_DFS_referrals_exit;
+
+ ref += le16_to_cpu(ref->Size);
+ }
+
+parse_DFS_referrals_exit:
+ if (rc) {
+ free_dfs_info_array(*target_nodes, *num_of_nodes);
+ *target_nodes = NULL;
+ *num_of_nodes = 0;
+ }
+ return rc;
+}
+