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-rw-r--r--fs/cifs/misc.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index c6729156f9a0..d3fb11529ed9 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -640,3 +640,108 @@ cifs_add_pending_open(struct cifs_fid *fid, struct tcon_link *tlink,
cifs_add_pending_open_locked(fid, tlink, open);
spin_unlock(&tlink_tcon(open->tlink)->open_file_lock);
}
+
+/* parses DFS refferal V3 structure
+ * caller is responsible for freeing target_nodes
+ * returns:
+ * - on success - 0
+ * - on failure - errno
+ */
+int
+parse_dfs_referrals(struct get_dfs_referral_rsp *rsp, u32 rsp_size,
+ unsigned int *num_of_nodes,
+ struct dfs_info3_param **target_nodes,
+ const struct nls_table *nls_codepage, int remap,
+ const char *searchName, bool is_unicode)
+{
+ int i, rc = 0;
+ char *data_end;
+ struct dfs_referral_level_3 *ref;
+
+ *num_of_nodes = le16_to_cpu(rsp->NumberOfReferrals);
+
+ if (*num_of_nodes < 1) {
+ cifs_dbg(VFS, "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 *) &(rsp->referrals);
+ if (ref->VersionNumber != cpu_to_le16(3)) {
+ cifs_dbg(VFS, "Referrals of V%d version are not supported, should be V3\n",
+ le16_to_cpu(ref->VersionNumber));
+ rc = -EINVAL;
+ goto parse_DFS_referrals_exit;
+ }
+
+ /* get the upper boundary of the resp buffer */
+ data_end = (char *)rsp + rsp_size;
+
+ cifs_dbg(FYI, "num_referrals: %d dfs flags: 0x%x ...\n",
+ *num_of_nodes, le32_to_cpu(rsp->DFSFlags));
+
+ *target_nodes = kcalloc(*num_of_nodes, sizeof(struct dfs_info3_param),
+ GFP_KERNEL);
+ if (*target_nodes == NULL) {
+ rc = -ENOMEM;
+ goto parse_DFS_referrals_exit;
+ }
+
+ /* collect necessary 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 = le32_to_cpu(rsp->DFSFlags);
+ if (is_unicode) {
+ __le16 *tmp = kmalloc(strlen(searchName)*2 + 2,
+ GFP_KERNEL);
+ if (tmp == NULL) {
+ rc = -ENOMEM;
+ goto parse_DFS_referrals_exit;
+ }
+ cifsConvertToUTF16((__le16 *) tmp, searchName,
+ PATH_MAX, nls_codepage, remap);
+ node->path_consumed = cifs_utf16_bytes(tmp,
+ le16_to_cpu(rsp->PathConsumed),
+ nls_codepage);
+ kfree(tmp);
+ } else
+ node->path_consumed = le16_to_cpu(rsp->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;
+ node->path_name = cifs_strndup_from_utf16(temp, max_len,
+ is_unicode, nls_codepage);
+ if (!node->path_name) {
+ rc = -ENOMEM;
+ goto parse_DFS_referrals_exit;
+ }
+
+ /* copy link target UNC */
+ temp = (char *)ref + le16_to_cpu(ref->NetworkAddressOffset);
+ max_len = data_end - temp;
+ node->node_name = cifs_strndup_from_utf16(temp, max_len,
+ is_unicode, nls_codepage);
+ if (!node->node_name) {
+ rc = -ENOMEM;
+ goto parse_DFS_referrals_exit;
+ }
+
+ ref++;
+ }
+
+parse_DFS_referrals_exit:
+ if (rc) {
+ free_dfs_info_array(*target_nodes, *num_of_nodes);
+ *target_nodes = NULL;
+ *num_of_nodes = 0;
+ }
+ return rc;
+}