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| author | Jakub Sitnicki <jkbs@redhat.com> | 2017-08-23 09:58:29 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-25 03:21:17 +0200 |
| commit | 23aebdacb05dab9efdf22b9e0413491cbd5f128f (patch) | |
| tree | c686bd03925a2d68a4438b5ec39c92b027f4e76d /include/net/ip6_route.h | |
| parent | net: Extend struct flowi6 with multipath hash (diff) | |
| download | linux-23aebdacb05dab9efdf22b9e0413491cbd5f128f.tar.xz linux-23aebdacb05dab9efdf22b9e0413491cbd5f128f.zip | |
ipv6: Compute multipath hash for ICMP errors from offending packet
When forwarding or sending out an ICMPv6 error, look at the embedded
packet that triggered the error and compute a flow hash over its
headers.
This let's us route the ICMP error together with the flow it belongs to
when multipath (ECMP) routing is in use, which in turn makes Path MTU
Discovery work in ECMP load-balanced or anycast setups (RFC 7690).
Granted, end-hosts behind the ECMP router (aka servers) need to reflect
the IPv6 Flow Label for PMTUD to work.
The code is organized to be in parallel with ipv4 stack:
ip_multipath_l3_keys -> ip6_multipath_l3_keys
fib_multipath_hash -> rt6_multipath_hash
Signed-off-by: Jakub Sitnicki <jkbs@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/net/ip6_route.h')
| -rw-r--r-- | include/net/ip6_route.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/net/ip6_route.h b/include/net/ip6_route.h index 907d39a42f6b..882bc3c7ccde 100644 --- a/include/net/ip6_route.h +++ b/include/net/ip6_route.h @@ -115,6 +115,7 @@ static inline int ip6_route_get_saddr(struct net *net, struct rt6_info *rt, struct rt6_info *rt6_lookup(struct net *net, const struct in6_addr *daddr, const struct in6_addr *saddr, int oif, int flags); +u32 rt6_multipath_hash(const struct flowi6 *fl6, const struct sk_buff *skb); struct dst_entry *icmp6_dst_alloc(struct net_device *dev, struct flowi6 *fl6); |