[CRIU] [PATCH criu v5 0/7] net: add support of network device sysctl config

[Pavel Tikhomirov]

One can set those config options with:
sysctl net.ipv4.conf.<device>.<option>=<value>
and check them with:
cat /proc/sys/net/ipv4/conf/<device>/<option>

description: There are a lot of options like enable and configure
IPSEC, ARP, ICMP, SRR, IGMP, Reverse Path Filtering, redirecting.

*do not restore mc_forwarding

https://bugzilla.openvz.org/show_bug.cgi?id=2965

changes:
v2:
include per device conf in net_device_entry,
add per netns entry to hold all and default conf,
invert logic and introduce array of strings,
use criu sysctl engine.
v3:
move PB_NETNS to AUTOGEN;
read/write sysctl-s in batches;
reorder restore: default, all, devices;
do not c/r mc_forwarding option it can be set only
once by multicast daemon using setsockopt on socket,
which will become a multicast managment socket.
v4:
use name of device in ipv4_conf_op instead of full dir,
don't restore the device values that match the "default" set except lo.
v5:
use ARRAY_SIZE, put config options paths on stack, improve error
messages, allow empty images

Pavel Tikhomirov (7):
  add netns protobuf entry and image, also add conf to net device entry
  add devconfs array to store config options names
  save net device confs bunched with criu sysctl API
  dump netns ipv4 conf all/default
  restore netns ipv4 conf all/default
  restore net device ipv4 confs
  optimization: do not restore configs for devices if value is default

 cr-show.c               |   1 +
 image-desc.c            |   1 +
 include/image-desc.h    |   1 +
 include/magic.h         |   1 +
 include/protobuf-desc.h |   5 +-
 net.c                   | 166 +++++++++++++++++++++++++++++++++++++++++++++++-
 protobuf/netdev.proto   |   7 ++
 7 files changed, 177 insertions(+), 5 deletions(-)

-- 
1.9.3