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ipv6: Add hop-by-hop header to jumbograms in ip6_output

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Instead of simply forcing a 0 payload_len in IPv6 header,
implement RFC 2675 and insert a custom extension header.

Note that only TCP stack is currently potentially generating
jumbograms, and that this extension header is purely local,
it wont be sent on a physical link.

This is needed so that packet capture (tcpdump and friends)
can properly dissect these large packets.

Signed-off-by: Coco Li <lixiaoyan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Alexander Duyck <alexanderduyck@fb.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Coco Li
2022-05-13 11:34:04 -07:00
committed by David S. Miller
parent 0fe79f28bf
commit 80e425b613
2 changed files with 21 additions and 2 deletions
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1
include/linux/ipv6.h
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@@ -145,6 +145,7 @@ struct inet6_skb_parm {
#define IP6SKB_L3SLAVE 64
#define IP6SKB_JUMBOGRAM 128
#define IP6SKB_SEG6 256
#define IP6SKB_FAKEJUMBO 512
};
#if defined(CONFIG_NET_L3_MASTER_DEV)