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.
You can also get the series from: https://github.com/macrosheep/qemu/tree/netfilter-v7 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: - dump v7: - print filter info when execute 'info network' - addressed Jason's comments v6: - add multiqueue support, please see individual patch for detail v5: - add a sent_cb param to filter receive_iov api - squash the 4th patch into patch 3 - remove dummy sent_cb (buffer filter) - addressed Jason's other comments, see individual patches for detail v4: - get rid of struct Filter - squash the 4th patch into patch 2 - fix qemu_netfilter_pass_to_next_iov - get rid of bh (buffer filter) - release the packet to next filter instead of to receiver (buffer filter) v3: - add an api to pass the packet to next filter - remove netfilters when delete netdev - add qtest testcases for netfilter - addressed comments from Jason 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 (11): net: add a new object netfilter init/cleanup of netfilter object netfilter: add netfilter_{add|del} commands netfilter: hook packets before net queue send move out net queue structs define netfilter: add an API to pass the packet to next filter netfilter: print filter info associate with the netdev net/queue: export qemu_net_queue_append_iov netfilter: add a netbuffer filter filter/buffer: update command description and help tests: add test cases for netfilter object hmp-commands.hx | 30 +++++ hmp.c | 29 +++++ hmp.h | 4 + include/net/filter.h | 64 ++++++++++ include/net/net.h | 1 + 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 | 125 ++++++++++++++++++ net/filter.c | 331 ++++++++++++++++++++++++++++++++++++++++++++++++ net/filters.h | 17 +++ net/net.c | 85 +++++++++++++ net/queue.c | 31 +---- qapi-schema.json | 100 +++++++++++++++ qemu-options.hx | 4 + qmp-commands.hx | 57 +++++++++ tests/.gitignore | 1 + tests/Makefile | 2 + tests/test-netfilter.c | 194 ++++++++++++++++++++++++++++ vl.c | 13 ++ 22 files changed, 1126 insertions(+), 25 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 create mode 100644 tests/test-netfilter.c -- 1.9.1
