[net-next,v3,0/9] vrf: allow simultaneous service instances in default and other VRFs

Services currently have to be VRF-aware if they are using an unbound
socket. One cannot have multiple service instances running in the
default and other VRFs for services that are not VRF-aware and listen
on an unbound socket. This is because there is no way of isolating
packets received in the default VRF from those arriving in other VRFs.

This series provides this isolation subject to the existing kernel
parameter net.ipv4.tcp_l3mdev_accept not being set, given that this is
documented as allowing a single service instance to work across all
VRF domains. The functionality applies to UDP & TCP services, for IPv4
and IPv6, in particular adding VRF table handling for IPv6 multicast.

Example of running ssh instances in default and blue VRF:

$ /usr/sbin/sshd -D
$ ip vrf exec vrf-blue /usr/sbin/sshd
$ ss -ta | egrep 'State|ssh'
State   Recv-Q   Send-Q           Local Address:Port       Peer Address:Port
LISTEN  0        128           0.0.0.0%vrf-blue:ssh             0.0.0.0:*
LISTEN  0        128                    0.0.0.0:ssh             0.0.0.0:*
ESTAB   0        0              192.168.122.220:ssh       192.168.122.1:50282
LISTEN  0        128              [::]%vrf-blue:ssh                [::]:*
LISTEN  0        128                       [::]:ssh                [::]:*
ESTAB   0        0           [3000::2]%vrf-blue:ssh           [3000::9]:45896
ESTAB   0        0                    [2000::2]:ssh           [2000::9]:46398

v1:
   - Address Paolo Abeni's comments (patch 4/5)
   - Fix build when CONFIG_NET_L3_MASTER_DEV not defined (patch 1/5)
v2:
   - Address David Aherns' comments (patches 4/5 and 5/5)
   - Remove patches 3/5 and 5/5 from series for individual submissions
   - Include a sysctl for raw sockets as recommended by David Ahern
   - Expand series into 10 patches and provide improved descriptions
v3:
   - Update description for patch 1/10 and remove patch 6/10

Dewi Morgan (1):
  ipv6: do not drop vrf udp multicast packets

Duncan Eastoe (1):
  net: fix raw socket lookup device bind matching with VRFs

Mike Manning (6):
  net: ensure unbound stream socket to be chosen when not in a VRF
  net: ensure unbound datagram socket to be chosen when not in a VRF
  net: provide a sysctl raw_l3mdev_accept for raw socket lookup with
    VRFs
  vrf: mark skb for multicast or link-local as enslaved to VRF
  ipv6: allow ping to link-local address in VRF
  ipv6: handling of multicast packets received in VRF

Robert Shearman (1):
  net: allow binding socket in a VRF when there's an unbound socket

 Documentation/networking/ip-sysctl.txt |  9 +++++++++
 Documentation/networking/vrf.txt       | 17 ++++++++++-------
 drivers/net/vrf.c                      | 19 +++++++++---------
 include/net/inet6_hashtables.h         |  5 ++---
 include/net/inet_hashtables.h          | 24 ++++++++++++++++-------
 include/net/inet_sock.h                | 21 ++++++++++++++++++++
 include/net/netns/ipv4.h               |  3 +++
 include/net/raw.h                      | 12 ++++++++++++
 include/net/udp.h                      | 11 +++++++++++
 net/core/sock.c                        |  2 ++
 net/ipv4/inet_connection_sock.c        | 13 ++++++++++---
 net/ipv4/inet_hashtables.c             | 34 ++++++++++++++++++++-------------
 net/ipv4/raw.c                         |  3 +--
 net/ipv4/sysctl_net_ipv4.c             | 11 +++++++++++
 net/ipv4/udp.c                         | 15 ++++++---------
 net/ipv6/datagram.c                    |  5 ++++-
 net/ipv6/inet6_hashtables.c            | 14 ++++++--------
 net/ipv6/ip6_input.c                   | 35 +++++++++++++++++++++++++++++++---
 net/ipv6/ipv6_sockglue.c               |  2 +-
 net/ipv6/raw.c                         |  5 ++---
 net/ipv6/udp.c                         | 22 ++++++++++-----------
 21 files changed, 200 insertions(+), 82 deletions(-)

David, please review this series.

Thanks.

On 10/5/18 3:43 PM, David Miller wrote:
> 
> David, please review this series.
> 
> Thanks.
> 

Looking at them now.

Dave: Patches 1 and 2 do not apply cleanly so a new version is needed.
From your perspective you an mark them as changes needed.

Mike: Give me a few days before you post a v4; I need to look into the
ping issue we discussed off list.