netdev - [PATCH net-next 2/5] net: Extend struct flowi6 with multipath hash

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Date:   Mon, 24 Oct 2016 11:28:49 +0200
From:   Jakub Sitnicki <jkbs@...hat.com>
To:     netdev@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH net-next 2/5] net: Extend struct flowi6 with multipath hash

Allow for functions that fill out the IPv6 flow info to also pass a hash
computed over the skb contents. The hash value will drive the multipath
routing decisions.

This is intended for special treatment of ICMPv6 errors, where we would
like to make a routing decision based on the flow identifying the
offending IPv6 datagram that triggered the error, rather than the flow
of the ICMP error itself.

Signed-off-by: Jakub Sitnicki <jkbs@...hat.com>
---
 include/net/flow.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/net/flow.h b/include/net/flow.h
index 035aa77..73ee3aa 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -143,6 +143,7 @@ struct flowi6 {
 #define fl6_ipsec_spi		uli.spi
 #define fl6_mh_type		uli.mht.type
 #define fl6_gre_key		uli.gre_key
+	__u32			mp_hash;
 } __attribute__((__aligned__(BITS_PER_LONG/8)));

 struct flowidn {
-- 
2.7.4