Signed-off-by: Aurelien Aptel <aaptel@xxxxxxxx>
---
fs/cifs/smb2ops.c | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
fs/cifs/smb2pdu.h | 8 +++++++
2 files changed, 80 insertions(+)
diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c
index a44b4db..2563fe8 100644
--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -1097,6 +1097,78 @@ smb2_new_lease_key(struct cifs_fid *fid)
generate_random_uuid(fid->lease_key);
}
+static int
+smb2_get_dfs_refer(const unsigned int xid, struct cifs_ses *ses,
+ const char *search_name,
+ struct dfs_info3_param **target_nodes,
+ unsigned int *num_of_nodes,
+ const struct nls_table *nls_codepage, int remap)
+{
+ int rc = -EINVAL;
+ __le16 *utf16_path = NULL;
+ int utf16_path_len = 0;
+ struct cifs_tcon *tcon;
+ struct fsctl_get_dfs_referral_req *dfs_req = NULL;
+ struct get_dfs_referral_rsp *dfs_rsp = NULL;
+ u32 dfs_req_size = 0, dfs_rsp_size = 0;
+
+ cifs_dbg(FYI, "smb2_get_dfs_refer path <%s>\n", search_name);
+
+ /*
+ * Use any tcon from the current session. Here, the first one.
+ */
+ tcon = list_first_entry(&ses->tcon_list, struct cifs_tcon, tcon_list);
+ if (!tcon)
+ goto out;
+
+ utf16_path = cifs_strndup_to_utf16(search_name, PATH_MAX,
+ &utf16_path_len,
+ nls_codepage, remap);
+ if (!utf16_path) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ dfs_req_size = sizeof(*dfs_req) + utf16_path_len;
+ dfs_req = kzalloc(dfs_req_size, GFP_KERNEL);
+ if (!dfs_req) {
+ rc = -ENOMEM;
+ goto out;
+ }
+
+ /* Highest DFS referral version understood */
+ dfs_req->MaxReferralLevel = cpu_to_le16(DFS_VERSION);
+
+ /* Path to resolve in an UTF-16 null-terminated string */
+ memcpy(dfs_req->RequestFileName, utf16_path, utf16_path_len);
+
+ do {
+ rc = SMB2_ioctl(xid, tcon, NO_FILE_ID, NO_FILE_ID,
+ FSCTL_DFS_GET_REFERRALS, true /* is_fsctl */,
+ (char *)dfs_req, dfs_req_size,
+ (char **)&dfs_rsp, &dfs_rsp_size);
+ } while (rc == -EAGAIN);
+
+ if (rc) {
+ cifs_dbg(VFS, "ioctl error in smb2_get_dfs_refer rc=%d\n", rc);
+ goto out;
+ }
+
+ rc = parse_dfs_referrals(dfs_rsp, dfs_rsp_size,
+ num_of_nodes, target_nodes,
+ nls_codepage, remap, search_name,
+ true /* is_unicode */);
+ if (rc) {
+ cifs_dbg(VFS, "parse error in smb2_get_dfs_refer rc=%d\n", rc);
+ goto out;
+ }
+
+ out:
+ kfree(utf16_path);
+ kfree(dfs_req);
+ kfree(dfs_rsp);
+ return rc;
+}
#define SMB2_SYMLINK_STRUCT_SIZE \
(sizeof(struct smb2_err_rsp) - 1 + sizeof(struct smb2_symlink_err_rsp))
diff --git a/fs/cifs/smb2pdu.h b/fs/cifs/smb2pdu.h
index c03b252..18700fd 100644
--- a/fs/cifs/smb2pdu.h
+++ b/fs/cifs/smb2pdu.h
@@ -695,6 +695,14 @@ struct fsctl_get_integrity_information_rsp {
/* Integrity flags for above */
#define FSCTL_INTEGRITY_FLAG_CHECKSUM_ENFORCEMENT_OFF 0x00000001
+/* See MS-DFSC 2.2.2 */
+struct fsctl_get_dfs_referral_req {
+ __le16 MaxReferralLevel;
+ __u8 RequestFileName[];
+} __packed;
+
+/* DFS response is struct get_dfs_refer_rsp */
+
/* See MS-SMB2 2.2.31.3 */
struct network_resiliency_req {
__le32 Timeout;
--
2.10.2
--
To unsubscribe from this list: send the line "unsubscribe linux-cifs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
