[Qemu-devel] [PATCH v2 0/9] For QEMU 2.5: Add a netfilter object and netbuffer filter

[Yang Hongyang]

This patch add a new object netfilter, capture all network packets.
Also implement a netbuffer based on this object.
the "buffer" netfilter could be used by VM FT solutions like
MicroCheckpointing, to buffer/release packets. Or to simulate
packet delay.

Most of the changes of v2 are from Jason's comments.
You can also get the series from:
https://github.com/macrosheep/qemu/tree/netfilter-v2

Usage:
 -netdev tap,id=bn0
 -netfilter buffer,id=f0,netdev=bn0,chain=in,interval=1000
 -device e1000,netdev=bn0

dynamically add/remove netfilters:
 netfilter_add buffer,id=f0,netdev=bn0,chain=in,interval=1000
 netfilter_del f0

NOTE:
 interval's scale is microsecond.
 chain is optional, and is one of in|out|all, default is "all".
       "in" means this filter will receive packets sent to the @netdev
       "out" means this filter will receive packets sent from the @netdev
       "all" means this filter will receive packets both sent to/from
             the @netdev

TODO:
 - multiqueue support
 - dump

v2:
 - add a chain option to netfilter object
 - move the hook place earlier, before net_queue_send
 - drop the unused api in buffer filter
 - squash buffer filter patches into one
 - remove receive() api from netfilter, only receive_iov() is enough
 - addressed comments from Jason&Thomas

v1:
 initial patch.

Yang Hongyang (9):
  net: add a new object netfilter
  init/cleanup of netfilter object
  netfilter: add netfilter_{add|del} commands
  net: add/remove filters from network backend
  netfilter: hook packets before net queue send
  net/queue: export qemu_net_queue_append_iov
  move out net queue structs define
  netfilter: add a netbuffer filter
  filter/buffer: update command description and help

 hmp-commands.hx         |  30 ++++++
 hmp.c                   |  29 ++++++
 hmp.h                   |   4 +
 include/net/filter.h    |  55 +++++++++++
 include/net/net.h       |   8 ++
 include/net/queue.h     |  26 +++++
 include/qemu/typedefs.h |   1 +
 include/sysemu/sysemu.h |   1 +
 monitor.c               |  33 +++++++
 net/Makefile.objs       |   2 +
 net/filter-buffer.c     | 160 ++++++++++++++++++++++++++++++
 net/filter.c            | 251 ++++++++++++++++++++++++++++++++++++++++++++++++
 net/filters.h           |  17 ++++
 net/net.c               | 105 +++++++++++++++++++-
 net/queue.c             |  31 ++----
 qapi-schema.json        | 100 +++++++++++++++++++
 qemu-options.hx         |   4 +
 qmp-commands.hx         |  57 +++++++++++
 vl.c                    |  13 +++
 19 files changed, 901 insertions(+), 26 deletions(-)
 create mode 100644 include/net/filter.h
 create mode 100644 net/filter-buffer.c
 create mode 100644 net/filter.c
 create mode 100644 net/filters.h

-- 
1.9.1