diff options
| author | Zheng Da <zhengda1936@gmail.com> | 2016-11-02 18:06:53 +0100 |
|---|---|---|
| committer | Justus Winter <justus@gnupg.org> | 2016-11-04 15:40:53 +0100 |
| commit | 25d614aa11e52370c200e677099746a619ea76db (patch) | |
| tree | 46bbcbf80c1264131264b6d3ab334d856a17ffdc /eth-multiplexer/README | |
| parent | 50e14fce11f2bebb4faad220f8f610a55f4110c5 (diff) | |
| download | hurd-25d614aa11e52370c200e677099746a619ea76db.tar.gz hurd-25d614aa11e52370c200e677099746a619ea76db.tar.bz2 hurd-25d614aa11e52370c200e677099746a619ea76db.zip | |
eth-multiplexer: Merge the eth-multiplexer.
* Makefile (prog-subdirs): Add the new program.
* NEWS: Update.
* eth-multiplexer/ChangeLog: New file.
* eth-multiplexer/Makefile: Likewise.
* eth-multiplexer/README: Likewise.
* eth-multiplexer/demuxer.c: Likewise.
* eth-multiplexer/dev_stat.c: Likewise.
* eth-multiplexer/device_impl.c: Likewise.
* eth-multiplexer/ethernet.c: Likewise.
* eth-multiplexer/ethernet.h: Likewise.
* eth-multiplexer/mig-decls.h: Likewise.
* eth-multiplexer/mig-mutate.h: Likewise.
* eth-multiplexer/multiplexer.c: Likewise.
* eth-multiplexer/netfs_impl.c: Likewise.
* eth-multiplexer/netfs_impl.h: Likewise.
* eth-multiplexer/notify_impl.c: Likewise.
* eth-multiplexer/test.c: Likewise.
* eth-multiplexer/util.h: Likewise.
* eth-multiplexer/vdev.c: Likewise.
* eth-multiplexer/vdev.h: Likewise.
The eth-multiplexer has been written by Zheng Da. This merges his
work into the main repository.
Diffstat (limited to 'eth-multiplexer/README')
| -rw-r--r-- | eth-multiplexer/README | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/eth-multiplexer/README b/eth-multiplexer/README new file mode 100644 index 00000000..940c7e49 --- /dev/null +++ b/eth-multiplexer/README @@ -0,0 +1,27 @@ +[Introduction] + +eth-multiplexer is a network multiplexer. It creates virtual ethernet interface and dispatches the packet to the right user program that opens its virtual interface. It also works as a bridge to connect the real ethernet interface and the virtual ones. + + +[Usage] + +Usage: eth-multiplexer [OPTION...] +Hurd multiplexer server. + + -i, --interface=DEVICE Network interface to use + -?, --help Give this help list + --usage Give a short usage message + -V, --version Print program version + +Mandatory or optional arguments to long options are also mandatory or optional +for any corresponding short options. + + +The '-i' option specifies the network interface the translator sits on. eth-multiplexer can only connect to one network interface and the '-i' option should be only used once. DEVICE is a device file that is created by the devnode translator. + + +[Internal] + +eth-multiplexer implements the server side functions in device.defs, so other programs can access the virtual device as other devices. All information about the virtual interface is kept in the vether_device structure. +When eth-multiplexer gets a packet from a virtual interface (which happens in ds_device_write) or from the real interface (which happens in ethernet_demuxer), it sends the packet to all other interfaces. eth-multipexer has BPF filters for each client. The BPF filter decides whether to deliver the packet. The packet delivery is done by deliver_pack(). There is no filter for the real network interface in eth-multiplexer, so every packet from the virtual interface will be sent to the real interface whose filter will decide the destination of the packet. +eth-multiplexer sets the real interface into the promiscuous mode, so eth-multiplexer can receive the packet with the virtual interface's hardware address from the real interface. |