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netfilter: rt: add support to fetch path mss

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to be used in combination with tcp option set support to mimic
iptables TCPMSS --clamp-mss-to-pmtu.

v2: Eric Dumazet points out dst must be initialized.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
This commit is contained in:
Florian Westphal 2017-08-08 15:48:04 +02:00 • committed by Pablo Neira Ayuso
parent 99d1712bc4
commit 6b5dc98e8f
2 changed files with 68 additions and 0 deletions
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2
include/uapi/linux/netfilter/nf_tables.h
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@ -811,11 +811,13 @@ enum nft_meta_keys {
* @NFT_RT_CLASSID: realm value of packet's route (skb->dst->tclassid)
* @NFT_RT_NEXTHOP4: routing nexthop for IPv4
* @NFT_RT_NEXTHOP6: routing nexthop for IPv6
* @NFT_RT_TCPMSS: fetch current path tcp mss
*/
enum nft_rt_keys {
NFT_RT_CLASSID,
NFT_RT_NEXTHOP4,
NFT_RT_NEXTHOP6,
NFT_RT_TCPMSS,
};
/**