[PATCH net-next v7 02/10] ipv6: Cleanup IPv6 TLV definitions
From: Tom Herbert <hidden>
Date: 2026-02-04 22:53:06
Subsystem:
the rest · Maintainer:
Linus Torvalds
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 <redacted> Reviewed-by: Justin Iurman <justin.iurman@gmail.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..438283dc5fde 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_TNL_ENCAP_LIMIT 4 /* RFC 2473, DestOpt */ +#define IPV6_TLV_ROUTERALERT 5 /* HBH */ +#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