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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/include/uapi/linux/neighbour.h
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@@ -28,6 +28,9 @@
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 	NDA_MASTER,
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 	NDA_LINK_NETNSID,
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 	NDA_SRC_VNI,
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+	NDA_PROTOCOL,  /* Originator of entry */
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+	NDA_NH_ID,
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+	NDA_FDB_EXT_ATTRS,
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 	__NDA_MAX
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 };
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@@ -43,6 +46,7 @@
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 #define NTF_PROXY	0x08	/* == ATF_PUBL */
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 #define NTF_EXT_LEARNED	0x10
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 #define NTF_OFFLOADED   0x20
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+#define NTF_STICKY	0x40
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 #define NTF_ROUTER	0x80
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 /*
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@@ -62,8 +66,11 @@
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 #define NUD_NONE	0x00
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 /* NUD_NOARP & NUD_PERMANENT are pseudostates, they never change
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-   and make no address resolution or NUD.
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-   NUD_PERMANENT also cannot be deleted by garbage collectors.
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+ * and make no address resolution or NUD.
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+ * NUD_PERMANENT also cannot be deleted by garbage collectors.
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+ * When NTF_EXT_LEARNED is set for a bridge fdb entry the different cache entry
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+ * states don't make sense and thus are ignored. Such entries don't age and
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+ * can roam.
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  */
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 struct nda_cacheinfo {
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@@ -169,4 +176,27 @@
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 };
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 #define NDTA_MAX (__NDTA_MAX - 1)
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+ /* FDB activity notification bits used in NFEA_ACTIVITY_NOTIFY:
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+  * - FDB_NOTIFY_BIT - notify on activity/expire for any entry
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+  * - FDB_NOTIFY_INACTIVE_BIT - mark as inactive to avoid multiple notifications
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+  */
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+enum {
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+	FDB_NOTIFY_BIT		= (1 << 0),
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+	FDB_NOTIFY_INACTIVE_BIT	= (1 << 1)
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+};
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+
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+/* embedded into NDA_FDB_EXT_ATTRS:
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+ * [NDA_FDB_EXT_ATTRS] = {
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+ *     [NFEA_ACTIVITY_NOTIFY]
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+ *     ...
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+ * }
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+ */
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+enum {
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+	NFEA_UNSPEC,
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+	NFEA_ACTIVITY_NOTIFY,
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+	NFEA_DONT_REFRESH,
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+	__NFEA_MAX
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+};
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+#define NFEA_MAX (__NFEA_MAX - 1)
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+
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 #endif