Enable user-mode networking through SLIRP #80

chiangkd · 2025-04-20T18:28:41Z

This commit integrates 'minislirp' as submodule and enables support for the new 'user' network device, which uses SLIRP for user-mode networking.

An internal pipe mechanism is introduced to monitor incoming data. The main loop polls the pipe for availabe data, and any incoming data is forwarded to the virtio-net device for processing.

Additionally, this commit introduces special address used by SLIRP for network configuration 1:

10.0.2.0: The SLIRP "on-line" configuration address.
10.0.2.2: An alias for the host running SLIRP.
10.0.2.3: An alias for the DNS address.
10.0.2.15: A recommended address for the PC running SLIRP.

Test procedures

Laumch semu with specified NETDEV=user

cd semu/
make check NETDEV=user

Configure the network interface with an IP address and routing:

ip addr add 10.0.2.15/24 dev eth0
ip link set eth0 up
ip route add default via 10.0.2.2

Test nerwork connectivity by pinging an external address:

# ping -c 3 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes

Output

64 bytes from 8.8.8.8: seq=0 ttl=255 time=17.001 ms
64 bytes from 8.8.8.8: seq=1 ttl=255 time=20.001 ms
64 bytes from 8.8.8.8: seq=2 ttl=255 time=17.001 ms

--- 8.8.8.8 ping statistics ---
3 packets transmitted, 3 packets received, 0% packet loss
round-trip min/avg/max = 17.001/18.001/20.001 ms

MacOS CI Flow issue: Currently, the MacOs CI flow is failing. The issue may be releated to a redefined swab function, similar to the one discussed in Port 86Box to Linux 86Box/86Box#136

bito-code-review · 2025-04-20T18:28:48Z

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.gitmodules

jserv · 2025-04-21T04:42:48Z

MacOS CI Flow issue: Currently, the MacOs CI flow is failing. The issue may be related to a redefined swab function, similar to the one discussed in Port 86Box to Linux 86Box/86Box#136

You should create an issue at minislirp.

slirp.c

This commit integrates 'minislirp' as submodule and enables support for the new 'user' network device, which uses SLIRP for user-mode networking. An internal pipe mechanism is introduced to monitor incoming data. The main loop polls the pipe for availabe data, and any incoming data is forwarded to the virtio-net device for processing. Additionally, this commit introduces special address used by SLIRP for network configuration [1]: - **10.0.2.0**: The SLIRP "on-line" configuration address. - **10.0.2.2**: An alias for the host running SLIRP. - **10.0.2.3**: An alias for the DNS address. - **10.0.2.15**: A recommended address for the PC running SLIRP. [1]: https://github.com/kost/slirp/blob/master/docs/slirp.doc

Ping 10.0.2.2 (default route) as hosted runner in Azure do not allow external pings.