[PATCH v3 0/8] Reduce differences between inbound and outbound socket binding

[David Gibson <david@gibson.dropbear.id.au>]

The fact that outbound forwarding sockets are bound to the loopback
address, whereas inbound forwarding sockets are (by default) bound to
the unspecified address leads to some unexpected differences between
the paths setting up each of them.

An idea for tackling bug 100 suggested a different approach which will
also reduce some of those differences and allow more code to be shared
between the two paths.  I've since discovered that this approach may
not help for bug 100, but it might still be worthwhile for the clean
up.

Patches 1..6/8 are cleanups which shouldn't change behaviour, and I
think are ready to merge.  7/8 is (arguably) a behavioural change, but
I've made my case for it in the patch comment.  8/8 needs some further
consideration, since I've discovered it does not fix bug 100 as is,
I'm including it for advance review, though.

v3:
 - A number of additional fixes covering the handling of IPV6_V6ONLY sockopt
 - Assorted trivial changes
v2:
 - Some rearrangements and rewordings for clarity

David Gibson (8):
  inany: Let length of sockaddr_inany be implicit from the family
  util, flow, pif: Simplify sock_l4_sa() interface
  tcp: Merge tcp_ns_sock_init[46]() into tcp_sock_init_one()
  udp: Unify some more inbound/outbound parts of udp_sock_init()
  udp: Move udp_sock_init() special case to its caller
  util: Fix setting of IPV6_V6ONLY socket option
  tcp, udp: Remove fallback if creating dual stack socket fails
  [RFC, DO NOT APPLY] tcp, udp: Bind outbound listening sockets by
    interface instead of address

 conf.c       |   4 +-
 flow.c       |  19 +++---
 icmp.c       |   3 +-
 inany.h      |  18 ++++++
 pif.c        |  26 ++------
 pif.h        |   2 +-
 tcp.c        | 164 +++++++++++++++++++--------------------------------
 tcp.h        |   5 +-
 tcp_splice.c |   5 +-
 udp.c        | 102 +++++++++++++++-----------------
 udp.h        |   5 +-
 util.c       |  55 +++++++++++++----
 util.h       |   9 ++-
 13 files changed, 201 insertions(+), 216 deletions(-)

-- 
2.51.0