netdev - [PATCH net-next 04/15] ipv6: add struct hop_jumbo

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Message-Id: <20220203015140.3022854-5-eric.dumazet@gmail.com>
Date:   Wed,  2 Feb 2022 17:51:29 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Coco Li <lixiaoyan@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next 04/15] ipv6: add struct hop_jumbo_hdr definition

From: Eric Dumazet <edumazet@...gle.com>

Following patches will need to add and remove local IPv6 jumbogram
options to enable BIG TCP.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/net/ipv6.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/net/ipv6.h b/include/net/ipv6.h
index 082f30256f59fad18b78746b6650aee840932eba..ea2a4351b654f8bc96503aae2b9adcd478e1f8b2 100644
--- a/include/net/ipv6.h
+++ b/include/net/ipv6.h
@@ -151,6 +151,17 @@ struct frag_hdr {
 	__be32	identification;
 };
 
+/*
+ * Jumbo payload option, as described in RFC 2676 2.
+ */
+struct hop_jumbo_hdr {
+	u8	nexthdr;
+	u8	hdrlen;
+	u8	tlv_type;	/* IPV6_TLV_JUMBO, 0xC2 */
+	u8	tlv_len;	/* 4 */
+	__be32	jumbo_payload_len;
+};
+
 #define	IP6_MF		0x0001
 #define	IP6_OFFSET	0xFFF8
 
-- 
2.35.0.rc2.247.g8bbb082509-goog