[Qemu-devel] Re: [PATCH] Add pcap-based host network bridge

["Sebastian Herbszt" <herbszt@gmx.de>]

Jan Kiszka wrote:
> This introduces bridged networking via pcap. Both Unix and Windows
> platforms are supported.
> 
> While tap-based bridging provides basically the same support pcap does,
> the latter is often more handy to set up. Under Linux, it doesn't
> require to configure a bridge and it is able to bypass the ebtables if
> this is desired. Also under Windows, the bridge setup can be lengthy
> procedure compared to using the pcap interface.

This looks like the pcap approach by Jung-uk Kim [1]. It was reported that
guest <-> host communication didn't work on Linux [2]. Is this also true for
this patch?

[1] http://article.gmane.org/gmane.comp.emulators.qemu/27304
[2] http://article.gmane.org/gmane.comp.emulators.qemu/27553

> Signed-off-by: Klaus Wenninger <klaus.wenninger@siemens-enterprise.com>
> Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
> ---
> 
> Makefile.target |    2 
> configure       |   35 ++++++++
> net.c           |  252 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
> qemu-doc.texi   |   14 +++
> vl.c            |    4 +
> 5 files changed, 305 insertions(+), 2 deletions(-)
> 

[snip]

> diff --git a/net.c b/net.c
> index c853daf..3cf372d 100644
> --- a/net.c
> +++ b/net.c
> @@ -93,6 +93,13 @@
> #endif
> #endif
> 
> +#if defined(CONFIG_PCAP)
> +#include <pcap.h>
> +#ifdef _WIN32
> +#include <remote-ext.h>
> +#endif /* _WIN32 */
> +#endif /* CONFIG_PCAP */
> +
> #if defined(__OpenBSD__)
> #include <util.h>
> #endif
> @@ -1033,6 +1040,241 @@ static int net_tap_init(VLANState *vlan, const char *model,
> 
> #endif /* !_WIN32 */
> 
> +#if defined(CONFIG_PCAP)
> +
> +#ifdef _WIN32
> +#define ADAPTER_KEY             "SYSTEM\\CurrentControlSet\\Control\\Class" \
> +                                "\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
> +#define NETWORK_CONNECTIONS_KEY "SYSTEM\\CurrentControlSet\\Control\\Network" \
> +                                "\\{4D36E972-E325-11CE-BFC1-08002BE10318}"
> +#endif

ADAPTER_KEY doesn't seem to be used.

- Sebastian