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Bug 2129244

Summary: ipv6 prefix is not generated when prefix_delegation is true
Product: Red Hat Enterprise Linux Fast Datapath Reporter: Jianlin Shi <jishi>
Component: ovn22.03Assignee: lorenzo bianconi <lorenzo.bianconi>
Status: CLOSED ERRATA QA Contact: Jianlin Shi <jishi>
Severity: medium Docs Contact:
Priority: medium    
Version: FDP 21.ICC: ctrautma, jiji, mmichels, ovn-bot
Target Milestone: ---Keywords: Regression
Target Release: FDP 21.I   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: ovn22.03-22.03.0-106.el8fdp Doc Type: If docs needed, set a value
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2022-11-03 00:30:13 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description Jianlin Shi 2022-09-23 03:50:31 UTC 
This bug was initially created as a copy of Bug #2014444

I am copying this bug because following issue happened again on ovn22.03-22.03.0-95: 



Description of problem:
ipv6 prefix is not generated with prefix_delegation is true

Version-Release number of selected component (if applicable):
ovn-2021-21.09.0-10.el8

How reproducible:
Always

Steps to Reproduce:
systemctl start openvswitch        
systemctl start ovn-northd            
ovn-nbctl set-connection ptcp:6641   
ovn-sbctl set-connection ptcp:6642                   
ovs-vsctl set open . external_ids:system-id=hv1 external_ids:ovn-remote=tcp:127.0.0.1:6642 external_ids:ovn-encap-type=geneve external_ids:ovn-encap-ip=127.0.0.1
systemctl restart ovn-controller
ovn-nbctl ls-add ls1                 
                           
ovn-nbctl lr-add lr1                                                  
ovn-nbctl lrp-add lr1 lr1-ls1 00:00:00:00:00:01 172.16.1.1/24
ovn-nbctl lsp-add ls1 ls1-lr1
ovn-nbctl lsp-set-type ls1-lr1 router                            
ovn-nbctl lsp-set-options ls1-lr1 router-port=lr1-ls1
ovn-nbctl lsp-set-addresses ls1-lr1 router                         
                                                        
ovn-nbctl lsp-add ls1 lnls1
ovn-nbctl lsp-set-options lnls1 network_name=provider
ovn-nbctl lsp-set-type lnls1 localnet       
ovn-nbctl lsp-set-addresses lnls1 unknown
                                                                        
ovn-nbctl set logical_router lr1 options:chassis=hv1         
                                                              
ovn-nbctl lrp-add lr1 lr1-ls2 00:00:00:00:00:02 172.16.1.2/24
ovn-nbctl lrp-add lr1 lr1-ls3 00:00:00:00:00:03 172.16.1.3/24
ovn-nbctl ls-add ls2                                               
ovn-nbctl lsp-add ls2 ls2-lr1                                               
ovn-nbctl lsp-set-type ls2-lr1 router            
ovn-nbctl lsp-set-options ls2-lr1 router-port=lr1-ls2
ovn-nbctl lsp-set-addresses ls2-lr1 router     
         
ovn-nbctl ls-add ls3               
ovn-nbctl lsp-add ls3 ls3-lr1
ovn-nbctl lsp-set-type ls3-lr1 router
ovn-nbctl lsp-set-options ls3-lr1 router-port=lr1-ls3
ovn-nbctl lsp-set-addresses ls3-lr1 router

ovs-vsctl add-br br-test
ip link set br-test up
ovs-vsctl set open . external-ids:ovn-bridge-mappings=provider:br-test

ip netns add server0
ip link add veth0_s0 netns server0 type veth peer name veth0_s0_p
ip netns exec server0 ip link set veth0_s0 up
ip netns exec server0 ip addr add 2001:1db8:3333::2/64 dev veth0_s0
ovs-vsctl add-port br-test veth0_s0_p
ip link set veth0_s0_p up

ip addr add 2001:1db8:3333::1/64 dev br-test

ovn-nbctl set logical_router_port lr1-ls1 options:prefix_delegation=true
ovn-nbctl set logical_router_port lr1-ls1 options:prefix=true
#ovn-nbctl set logical_router_port lr1-ls2 options:prefix=true
sleep 5
sed s/^iface.*/"iface \"veth0_s0\" {"/g -i /etc/dibbler/server.conf
sed s/pd-pool.*/"pd-pool 2001:1db8:3333::\/80"/g -i /etc/dibbler/server.conf
sed s/t1.*/"t1 10"/g -i /etc/dibbler/server.conf
sed s/t2.*/"t2 15"/g -i /etc/dibbler/server.conf
cat > /var/lib/dibbler/server-AddrMgr.xml <<EOF
<AddrMgr>
  <timestamp>1575481348</timestamp>
  <replayDetection>0</replayDetection>
</AddrMgr>
EOF
cat > /var/lib/dibbler/server-CfgMgr.xml <<EOF
<SrvCfgMgr> 
  <workDir>/var/lib/dibbler</workDir>
  <LogName>Server</LogName>
  <LogLevel>8</LogLevel>
  <InactiveMode>0</InactiveMode>
  <GuessMode>0</GuessMode>
</SrvCfgMgr>
EOF

ip netns exec server0 dibbler-server run > dibbler.log &
sleep 10

ovn-nbctl list logical_router_port lr1-ls1

Actual results:
ipv6_prefix is null

Expected results:
ipv6_prefix should be generated

Additional info:


[root@dell-per740-12 bz1823226]# rpm -qa | grep -E "openvswitch2.16|ovn-2021"
ovn-2021-21.09.0-10.el8fdp.x86_64
ovn-2021-host-21.09.0-10.el8fdp.x86_64
openvswitch2.16-2.16.0-16.el8fdp.x86_64
openvswitch2.16-test-2.16.0-16.el8fdp.noarch
ovn-2021-central-21.09.0-10.el8fdp.x86_64
python3-openvswitch2.16-2.16.0-16.el8fdp.x86_64

+ ovn-nbctl list logical_router_port lr1-ls1                                                          
_uuid               : f41357e7-d5bb-48c7-a80f-66c8bdaf94e4
enabled             : []                                                                              
external_ids        : {}                                                                              
gateway_chassis     : []                                                                              
ha_chassis_group    : []                                                                              
ipv6_prefix         : []                                                                              
ipv6_ra_configs     : {}                                                                              
mac                 : "00:00:00:00:00:01"                                                             
name                : lr1-ls1                                                                         
networks            : ["172.16.1.1/24"]                                                               
options             : {prefix="true", prefix_delegation="true"}
peer                : []

<=== ipv6_prefix is not generated

it seems that ipv6 solicit it not sent by ovn

the issue didn't occur on ovn-2021-21.06.0-29.el8:

[root@dell-per730-20 bz1823226]# rpm -qa | grep -E "openvswitch2.16|ovn-2021"
openvswitch2.16-test-2.16.0-16.el8fdp.noarch
ovn-2021-21.06.0-29.el8fdp.x86_64
openvswitch2.16-2.16.0-16.el8fdp.x86_64
ovn-2021-central-21.06.0-29.el8fdp.x86_64
python3-openvswitch2.16-2.16.0-16.el8fdp.x86_64
ovn-2021-host-21.06.0-29.el8fdp.x86_64

+ ovn-nbctl list logical_router_port lr1-ls1
_uuid               : 3eb2738c-085f-4a30-afa5-b26422d115b5
enabled             : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
ipv6_prefix         : ["2001:1db8:3333::7e23:0:0/96"]
ipv6_ra_configs     : {}
mac                 : "00:00:00:00:00:01"
name                : lr1-ls1
networks            : ["172.16.1.1/24"]
options             : {prefix="true", prefix_delegation="true"}
peer                : []

<== ipv6_prefix is generated.

reproducer is related to https://bugzilla.redhat.com/show_bug.cgi?id=1823226
Comment 1 Jianlin Shi 2022-09-23 04:05:29 UTC 
the issue didn't exist on ovn22.03-22.03.0-69. set regression
Comment 2 lorenzo bianconi 2022-09-29 11:25:54 UTC 
the regression seems to be introduced by the following commit when the logical router is running in gw router mode.

commit 04292cc2dc2c3823b0cf86612e50ad0023bcb73f
Author: Xavier Simonart <xsimonar>
Date:   Mon Aug 29 05:27:20 2022 -0400

    controller: fix potential segmentation violation when removing ports
    
    If a logical switch port is added and connected to a logical router
    port (through options: router-port) before the router port is
    created, then this might cause further issues such as segmentation
    violation when the switch and router ports are deleted.
    
    Signed-off-by: Xavier Simonart <xsimonar>
    Signed-off-by: Han Zhou <hzhou>

The issue does not occur if the router is running in distributed mode with a distributed gw port.
Comment 3 lorenzo bianconi 2022-09-29 15:48:23 UTC 
upstream fix: https://patchwork.ozlabs.org/project/ovn/patch/f5b8500418c7a93d42656a9a36a2f8a0423ac568.1664461524.git.lorenzo.bianconi@redhat.com/
Comment 4 OVN Bot 2022-10-06 04:06:29 UTC 
ovn22.09 fast-datapath-rhel-8 clone created at https://bugzilla.redhat.com/show_bug.cgi?id=2132529
ovn22.09 fast-datapath-rhel-9 clone created at https://bugzilla.redhat.com/show_bug.cgi?id=2132530
ovn22.06 fast-datapath-rhel-8 clone created at https://bugzilla.redhat.com/show_bug.cgi?id=2132533
ovn22.06 fast-datapath-rhel-9 clone created at https://bugzilla.redhat.com/show_bug.cgi?id=2132534
ovn22.03 fast-datapath-rhel-9 clone created at https://bugzilla.redhat.com/show_bug.cgi?id=2132536
Comment 8 Jianlin Shi 2022-10-14 01:56:36 UTC 
Verified on ovn22.03-106.el8:

+ sleep 10
+ ip netns exec server0 dibbler-server run
+ ovn-nbctl list logical_router_port lr1-ls1
_uuid               : 1a0fc3ea-8cdf-4cb6-a823-5284ed47352d
enabled             : []
external_ids        : {}
gateway_chassis     : []
ha_chassis_group    : []
ipv6_prefix         : ["2001:1db8:3333::4b29:0:0/96"]
ipv6_ra_configs     : {}
mac                 : "00:00:00:00:00:01"
name                : lr1-ls1
networks            : ["172.16.1.1/24"]
options             : {prefix="true", prefix_delegation="true"}
peer                : []
[root@dell-per740-12 bz2129244]# rpm -qa | grep -E "openvswitch2.17|ovn22.03"
ovn22.03-host-22.03.0-106.el8fdp.x86_64
ovn22.03-central-22.03.0-106.el8fdp.x86_64
ovn22.03-22.03.0-106.el8fdp.x86_64
openvswitch2.17-2.17.0-58.el8fdp.x86_64
Comment 9 Jianlin Shi 2022-10-14 03:05:18 UTC 
*** Bug 2132537 has been marked as a duplicate of this bug. ***
Comment 11 errata-xmlrpc 2022-11-03 00:30:13 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (ovn22.03), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2022:7393