NgTech-LTD/gns3-server
2
0
Fork 0
mirror of https://github.com/GNS3/gns3-server.git synced 2026-10-13 14:05:36 +03:00
Code Issues Packages Projects Releases Wiki Activity

fix(docker): bring the veth host end up before a relay attach

Browse Source 
The unified veth host end is born admin-down (carrier off until a link
attaches), and libpcap cannot open a packet socket on an admin-down
interface — its netlink promiscuous-mode transaction returns ENOENT, so
'bridge add_nio_ethernet' failed on every runtime relay link (and would
on any relay link at container start). Bring the interface up for the
attach; the carrier pass in the caller refines the state afterwards (a
suspended NIO sets it back down). Verified live with a direct uBridge
probe: attach on a down veth -> ENOENT, after 'link set up' -> OK.
This commit is contained in:
YueGuobin 2026-09-29 18:14:23 +08:00
parent 2b45f29b2c
commit b1eb0984bc
No known key found for this signature in database
2 changed files with 10 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
gns3server/compute/docker/docker_vm.py
View File

@ -1959,6 +1959,13 @@ class DockerVM(BaseNode):
if host_ifc is not None and bridge_name not in self._bridges:
await self._ubridge_send(f"bridge create {bridge_name}")
self._bridges.add(bridge_name)
# libpcap cannot open a packet socket on an admin-down interface
# (its netlink promiscuous-mode transaction returns ENOENT), and
# the unified veth host end is born down (carrier off until a
# link attaches) — bring it up for the relay attach. The carrier
# pass in the caller refines the state afterwards (a suspended
# NIO sets it back down).
await self._ubridge_send(f'link set "{host_ifc}" up')
await self._ubridge_send(f'bridge add_nio_ethernet {bridge_name} "{host_ifc}"')
await self._ubridge_send(
"bridge add_nio_udp {bridge_name} {lport} {rhost} {rport}".format(

3
tests/compute/docker/test_docker_kernel_datapath.py
View File

@ -222,6 +222,9 @@ async def test_add_ubridge_connection_udp_relays_over_veth(vm):
[
call.send(f'docker create_veth "{host_ifc}" "{vm._veth_names(0, 0)[1]}"'),
call.send("bridge create bridge0"),
# the host end is born down; libpcap cannot attach to an
# admin-down interface, so the relay brings it up first
call.send(f'link set "{host_ifc}" up'),
call.send(f'bridge add_nio_ethernet bridge0 "{host_ifc}"'),
call.send("bridge add_nio_udp bridge0 4242 127.0.0.1 4343"),
call.send("bridge start bridge0"),