netdev - [PATCH net-next v3 3/7] ipv6: Cleanup IPv6 TLV definitions

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Message-ID: <20260119211212.55026-4-tom@herbertland.com>
Date: Mon, 19 Jan 2026 13:12:08 -0800
From: Tom Herbert <tom@...bertland.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	netdev@...r.kernel.org,
	justin.iurman@...ege.be
Cc: Tom Herbert <tom@...bertland.com>
Subject: [PATCH net-next v3 3/7] ipv6: Cleanup IPv6 TLV definitions

Move IPV6_TLV_TNL_ENCAP_LIMIT to uapi/linux/in6.h to be with the rest
of the TLV definitions. Label each of the TLV definitions as to whether
they are a Hop-by-Hop option, Destination option, or both.

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 include/uapi/linux/in6.h        | 21 ++++++++++++++-------
 include/uapi/linux/ip6_tunnel.h |  1 -
 2 files changed, 14 insertions(+), 8 deletions(-)

diff --git a/include/uapi/linux/in6.h b/include/uapi/linux/in6.h
index 5a47339ef7d7..c2f873c98d20 100644
--- a/include/uapi/linux/in6.h
+++ b/include/uapi/linux/in6.h
@@ -140,14 +140,21 @@ struct in6_flowlabel_req {
 
 /*
  *	IPv6 TLV options.
+ *
+ *	Hop-by-Hop and Destination options share the same number space.
+ *	For each option below whether it is a Hop-by-Hop option or
+ *	a Destination option is indicated by HBH or DestOpt.
  */
-#define IPV6_TLV_PAD1		0
-#define IPV6_TLV_PADN		1
-#define IPV6_TLV_ROUTERALERT	5
-#define IPV6_TLV_CALIPSO	7	/* RFC 5570 */
-#define IPV6_TLV_IOAM		49	/* RFC 9486 */
-#define IPV6_TLV_JUMBO		194
-#define IPV6_TLV_HAO		201	/* home address option */
+#define IPV6_TLV_PAD1		0	/* HBH or DestOpt */
+#define IPV6_TLV_PADN		1	/* HBH or DestOpt */
+#define IPV6_TLV_ROUTERALERT	5	/* HBH */
+#define IPV6_TLV_TNL_ENCAP_LIMIT 4	/* RFC 2473, DestOpt */
+#define IPV6_TLV_CALIPSO	7	/* RFC 5570, HBH */
+#define IPV6_TLV_IOAM		49	/* RFC 9486, HBH or Destopt
+					 * IOAM sent and rcvd as HBH
+					 */
+#define IPV6_TLV_JUMBO		194	/* HBH */
+#define IPV6_TLV_HAO		201	/* home address option, DestOpt */
 
 /*
  *	IPV6 socket options
diff --git a/include/uapi/linux/ip6_tunnel.h b/include/uapi/linux/ip6_tunnel.h
index 85182a839d42..35af4d9c35fb 100644
--- a/include/uapi/linux/ip6_tunnel.h
+++ b/include/uapi/linux/ip6_tunnel.h
@@ -6,7 +6,6 @@
 #include <linux/if.h>		/* For IFNAMSIZ. */
 #include <linux/in6.h>		/* For struct in6_addr. */
 
-#define IPV6_TLV_TNL_ENCAP_LIMIT 4
 #define IPV6_DEFAULT_TNL_ENCAP_LIMIT 4
 
 /* don't add encapsulation limit if one isn't present in inner packet */
-- 
2.43.0