1 files changed, 32 insertions, 0 deletions

diff --git a/include/uapi/linux/netlink.h b/include/uapi/linux/netlink.h
index b2c9c26ea30f..7df88770e029 100644
--- a/include/uapi/linux/netlink.h
+++ b/include/uapi/linux/netlink.h
@@ -69,6 +69,10 @@ struct nlmsghdr {
 #define NLM_F_CREATE    0x400   /* Create, if it does not exist */
 #define NLM_F_APPEND    0x800   /* Add to end of list           */
 
+/* Flags for ACK message */
+#define NLM_F_CAPPED    0x100   /* request was capped */
+#define NLM_F_ACK_TLVS  0x200   /* extended ACK TVLs were included */
+
 /*
    4.4BSD ADD           NLM_F_CREATE|NLM_F_EXCL
    4.4BSD CHANGE        NLM_F_REPLACE
@@ -101,6 +105,33 @@ struct nlmsghdr {
 struct nlmsgerr {
         int             error;
         struct nlmsghdr msg;
+        /*
+         * followed by the message contents unless NETLINK_CAP_ACK was set
+         * or the ACK indicates success (error == 0)
+         * message length is aligned with NLMSG_ALIGN()
+         */
+        /*
+         * followed by TLVs defined in enum nlmsgerr_attrs
+         * if NETLINK_EXT_ACK was set
+         */
+};
+
+/**
+ * enum nlmsgerr_attrs - nlmsgerr attributes
+ * @NLMSGERR_ATTR_UNUSED: unused
+ * @NLMSGERR_ATTR_MSG: error message string (string)
+ * @NLMSGERR_ATTR_OFFS: offset of the invalid attribute in the original
+ *       message, counting from the beginning of the header (u32)
+ * @__NLMSGERR_ATTR_MAX: number of attributes
+ * @NLMSGERR_ATTR_MAX: highest attribute number
+ */
+enum nlmsgerr_attrs {
+        NLMSGERR_ATTR_UNUSED,
+        NLMSGERR_ATTR_MSG,
+        NLMSGERR_ATTR_OFFS,
+
+        __NLMSGERR_ATTR_MAX,
+        NLMSGERR_ATTR_MAX = __NLMSGERR_ATTR_MAX - 1
 };
 
 #define NETLINK_ADD_MEMBERSHIP          1
@@ -115,6 +146,7 @@ struct nlmsgerr {
 #define NETLINK_LISTEN_ALL_NSID         8
 #define NETLINK_LIST_MEMBERSHIPS        9
 #define NETLINK_CAP_ACK                 10
+#define NETLINK_EXT_ACK                 11
 
 struct nl_pktinfo {
         __u32   group;