[PATCH -next 0/3] tcp: receive-side per route dctcp handling

[Florian Westphal <fw@strlen.de>]

Currently, the following case doesn't use DCTCP, even if it should:

- responder has f.e. cubic as system wide default
- 'ip route congctl dctcp $src' was set

Then, DCTCP is NOT used if a DCTCP sender attempts to connect from a
host in the $src range: ECT(0) is set, but listen_sk is not dctcp, so we
fail the INET_ECN_is_not_ect sanity check.

We also have to examine the dst used for the SYN/ACK reply to make this
case work.

In order to minimize additional cost, store the 'ecn is must have'
information is the dst_features field.

The set targets -next instead of -net since this doesn't seem to be a
serious bug and to give the change more soak time until it hits linus tree.

Daniel Borkmann (2):
      net: fib6: reduce identation in ip6_convert_metrics
      tcp: use dctcp if enabled on the route to the initiator

Florian Westphal (1):
      net: fib: move metrics parsing to a helper

 include/net/tcp.h              |  2 +-
 include/uapi/linux/rtnetlink.h | 11 +++---
 net/core/rtnetlink.c           |  4 +++
 net/ipv4/fib_semantics.c       | 78 ++++++++++++++++++++++++++----------------
 net/ipv4/tcp_cong.c            |  9 +++--
 net/ipv4/tcp_input.c           |  7 ++--
 net/ipv6/route.c               | 39 ++++++++++++---------
 7 files changed, 94 insertions(+), 56 deletions(-)