On 3/15/21 1:22 PM, Tim Rice wrote:
> Hey all,
>
> Sorry if this isn't the right place to report Iproute2 bugs. It was
> implied by README.devel as well as a couple of entries I saw in bugzilla.
>
> I use iproute2 batch mode to construct network namespaces. Example script:
>
> $ cat ~/bin/netns-test.sh
> #! /bin/bash
>
> gw=192.168.5.1
> ip=192.168.5.2
> ns=netns-test
> veth0=${ns}-0
> veth1=${ns}-1
>
> /usr/local/sbin/ip -b - << EOF
> link add $veth0 type veth peer name $veth1
> addr add $gw peer $ip dev $veth0
> link set dev $veth0 up
> netns add $ns
> link set $veth1 netns $ns
> netns exec $ns ip link set dev lo up
> netns exec $ns ip link set dev $veth1 up
> netns exec $ns ip addr add $ip/24 dev $veth1
> netns exec $ns ip addr add $ip peer $gw dev $veth1
> netns exec $ns ip route add default via $gw dev $veth1
> netns exec $ns ip route add 192.168.0.0/24 via $gw dev $veth1
> EOF
>
>
> I noticed when version 5.11.0 dropped that this stops working. Batch
> mode fails to bring up the inner veth.
>
> Expected usage (as produced by v5.10.0):
>
> $ sudo ./bin/netns-test.sh
> $ sudo ip netns exec netns-test ip route
> default via 192.168.5.1 dev netns-test-1
> 192.168.0.0/24 via 192.168.5.1 dev netns-test-1
> 192.168.5.0/24 dev netns-test-1 proto kernel scope link src 192.168.5.2
> 192.168.5.1 dev netns-test-1 proto kernel scope link src 192.168.5.2
>
> Actual behaviour:
>
> $ sudo ./bin/netns-test.sh
> $ sudo ip netns exec netns-test ip route # Notice the empty output
> $ sudo ip netns exec netns-test ip link
> 1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 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
> 39: netns-test-1@if40: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state
> DOWN mode DEFAULT group default qlen 1000
> link/ether 1a:96:4e:4f:84:31 brd ff:ff:ff:ff:ff:ff link-netnsid 0
>
> System info:
>
> * Distro: Void Linux
> * Kernel version: 5.10.23
> * CPU: AMD Ryzen 7 1800X and Ryzen 5 2600. (Reproduced on both.)
>
> Git bisect pinpoints this commit:
> https://github.com/shemminger/iproute2/commit/1d9a81b8c9f30f9f4abeb875998262f61bf10577
>
Petr, can you take a look at this regression?
