[PATCH v3 00/14] Introduce forwarding table

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

This creates a new data structure for recording our port forwarding: a
table of individual forwarding rules.  This is intended to replace the
existing forwarding mode, map and delta structures.  For now, only the
delta[] array is removed.  map is still used, but only for automatic
forwards.  Mode is still used, but only has significance during
configuration.

There's still a lot that can be done for flexible forwarding, but this
introduces the core data structure, and does enough to fix at least
one concrete defect with the current logic (bug 187).  I think it
would be a good point to give it a solid review and maybe merge.

I'm aware that this is a very large complex series, that will be
difficult to review.  I think that's more or less inevitable
implementing a feature as broad and complex as "flexible forwarding".
If it helps at all, I'm fine if it's not reviewed all at once - I
won't assume review is complete until either you say so, or I get
comments or R-b on each patch.

This applies on top of all 3 of my outstanding series in this area:
"Allow listen functions to return fds", "Clean ups to epoll
references" (v2) and "Small cleanups to splice forwarding logic".

David Gibson (14):
  inany: Extend inany_ntop() to treat NULL as a fully unspecified
    address
  conf, fwd: Keep a table of our port forwarding configuration
  conf: Accurately record ifname and address for outbound forwards
  conf, fwd: Record "auto" port forwards in forwarding table
  fwd: Make space to store listening sockets in forward table
  ip: Add ipproto_name() function
  fwd, tcp, udp: Set up listening sockets based on forward table
  tcp, udp: Remove old auto-forwarding socket arrays
  conf, fwd: Check forwarding table for conflicting rules
  fwd: Generate auto-forward exclusions from socket fd tables
  flow, fwd: Consult rules table when forwarding a new flow from socket
  fwd: Remap ports based directly on forwarding rule
  fwd, tcp, udp: Add forwarding rule to listening socket epoll
    references
  flow, fwd: Optimise forwarding rule lookup using epoll ref when
    possible

 conf.c         | 118 +++++++++------
 flow.c         |  59 ++++++--
 flow_table.h   |   2 +-
 fwd.c          | 379 ++++++++++++++++++++++++++++++++++++++++++++++---
 fwd.h          |  68 ++++++++-
 icmp.c         |   2 +-
 inany.c        |  28 +++-
 inany.h        |   1 +
 ip.c           |  26 ++++
 ip.h           |   2 +
 tcp.c          | 154 ++------------------
 tcp.h          |   6 +-
 udp.c          | 147 +++----------------
 udp.h          |   7 +-
 udp_flow.c     |  14 +-
 udp_flow.h     |   2 +-
 udp_internal.h |   4 +-
 17 files changed, 641 insertions(+), 378 deletions(-)

-- 
2.52.0