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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@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Sitnicki 2017-08-23 09:58:28 +02:00 committed by David S. Miller
parent 790c605668
commit 2982571712
1 changed files with 1 additions and 0 deletions
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include/net/flow.h
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@ -149,6 +149,7 @@ 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 {