mirror of
https://github.com/netbirdio/gvisor.git
synced 2026-05-22 17:12:49 -07:00
Jing Chen
35d3c6eb73
L2 MTU includes both payload and ethernet header. gVisor has supported setting
data link layer MTU, it will be up to users to set up proper value for a
device's MTU if a larger value is expected.
By doing the change, gVisor will be consistent with runc:
```shell
# runc
root@cec4d7238802:/# ip link set dev lo mtu 1234
root@cec4d7238802:/# ip link list dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 1234 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
# runsc before the change.
root@7cd89278d414:/# ip link set dev lo mtu 1234
root@7cd89278d414:/# ip link list dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 1220
link/loopback 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
# runsc after the change.
root@e811c5851226:/# ip link set dev lo mtu 1234
root@e811c5851226:/# ip link list dev lo
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 1234
link/loopback 00:00:00:00:00:00 brd ff:ff:ff:ff:ff:ff
```
PiperOrigin-RevId: 684746090
52 lines
1.8 KiB
Bash
Executable File
52 lines
1.8 KiB
Bash
Executable File
#!/bin/bash
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# Copyright 2024 The gVisor Authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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set -xeo pipefail
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source "$(dirname "$0")/rtnetlink_test.sh"
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# Create a new veth pair in the current namespace and change the MTU.
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ip link add name test_veth01 type veth peer name test_veth02
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ip link set test_veth01 mtu 3000
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ip link show test_veth01 | grep -E "mtu 3000"
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ip link del name test_veth01
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# Check that test_veth02 has been destroyed.
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if ! wait_for ! ip link show test_veth02; then
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fail "test_veth02 hasn't been destroyed"
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exit 1
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fi
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# Create a new veth pair in the current namespace and rename the link.
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ip link add name test_veth01 type veth peer name test_veth02
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ip link set test_veth01 name test_veth03
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ip link show test_veth03
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ip link del name test_veth03
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# Check that test_veth02 has been destroyed.
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if ! wait_for ! ip link show test_veth02; then
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fail "test_veth02 hasn't been destroyed"
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exit 1
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fi
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# Change the hardware address of a new veth device.
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ip link add name test_veth01 type veth peer name test_veth02
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ip link set dev test_veth01 address 1a:2a:3a:4a:5a:6a
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ip link show test_veth01 | grep "1a:2a:3a:4a:5a:6a"
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ip link del name test_veth01
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# Check that test_veth02 has been destroyed.
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if ! wait_for ! ip link show test_veth02; then
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fail "test_veth02 hasn't been destroyed"
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exit 1
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fi
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