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Bug 1553023 - [ovn]udp checksum of packet replied from dns server is error
Summary: [ovn]udp checksum of packet replied from dns server is error
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: openvswitch
Version: 7.5
Hardware: x86_64
OS: Linux
unspecified
high
Target Milestone: rc
: ---
Assignee: Mark Michelson
QA Contact: haidong li
URL:
Whiteboard:
Depends On:
Blocks: 1560628
TreeView+ depends on / blocked
 
Reported: 2018-03-08 04:11 UTC by haidong li
Modified: 2018-05-03 14:23 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2018-05-03 14:23:25 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)
pcap of server_ipv4 packet (916 bytes, application/octet-stream)
2018-03-08 04:11 UTC, haidong li 		no flags Details
View All

Description haidong li 2018-03-08 04:11:08 UTC 
Created attachment 1405691 [details]
pcap of server_ipv4 packet

Description of problem:
udp checksum of packet replied from dns server is error,so the client can't receive the translated address.

Version-Release number of selected component (if applicable):
ovs2.9

How reproducible:
everytime

Steps to Reproduce:
The dns server can reply packet to correct address.But the guest doesn't ping the ip address translated by dns server.Packet responded by dns server is marked as error in wireshark,it seems the udp checksum is illegal.
 
[root@localhost ~]# uname -a
Linux localhost.localdomain 3.10.0-845.el7.x86_64 #1 SMP Mon Feb 5 07:43:47 EST 2018 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost ~]# 
[root@localhost ~]# cat /etc/resolv.conf
; generated by /usr/sbin/dhclient-script
nameserver 2001:db8:102::254
[root@localhost ~]# 
[root@localhost ~]# ping -c10 abc.org
08:46:41.800846 IP6 2001:db8:102::12.50257 > 2001:db8:102::254.53: 34728+ A? abc.org. (25)
08:46:41.801712 IP6 2001:db8:102::254.53 > 2001:db8:102::12.50257: 34728- 1/0/0 A 172.16.102.11 (48)
08:46:46.806007 IP6 2001:db8:102::12.50257 > 2001:db8:102::254.53: 34728+ A? abc.org. (25)
08:46:46.806482 IP6 2001:db8:102::254.53 > 2001:db8:102::12.50257: 34728- 1/0/0 A 172.16.102.11 (48)
08:46:46.810917 IP6 fe80::2de:adff:fe01:101 > 2001:db8:102::254: ICMP6, neighbor solicitation, who has 2001:db8:102::254, length 32
08:46:46.811502 IP6 2001:db8:102::254 > fe80::2de:adff:fe01:101: ICMP6, neighbor advertisement, tgt is 2001:db8:102::254, length 32
08:46:51.811221 IP6 2001:db8:102::12.38529 > 2001:db8:102::254.53: 27956+ A? abc.org.localdomain. (37)
08:46:56.816346 IP6 2001:db8:102::12.38529 > 2001:db8:102::254.53: 27956+ A? abc.org.localdomain. (37)
ping: abc.org: Name or service not known

[root@localhost ~]# ping6 -c10 abc.org
08:48:39.284912 IP6 2001:db8:102::12.53408 > 2001:db8:102::254.53: 36782+ AAAA? abc.org. (25)
08:48:39.285432 IP6 2001:db8:102::254.53 > 2001:db8:102::12.53408: 36782- 1/0/0 AAAA 2001:db8:102::11 (60)
08:48:44.289996 IP6 2001:db8:102::12.53408 > 2001:db8:102::254.53: 36782+ AAAA? abc.org. (25)
08:48:44.290299 IP6 2001:db8:102::254.53 > 2001:db8:102::12.53408: 36782- 1/0/0 AAAA 2001:db8:102::11 (60)
08:48:44.298952 IP6 fe80::2de:adff:fe01:101 > 2001:db8:102::254: ICMP6, neighbor solicitation, who has 2001:db8:102::254, length 32
08:48:44.299438 IP6 2001:db8:102::254 > fe80::2de:adff:fe01:101: ICMP6, neighbor advertisement, tgt is 2001:db8:102::254, length 32
08:48:49.295221 IP6 2001:db8:102::12.45208 > 2001:db8:102::254.53: 10057+ AAAA? abc.org.localdomain. (37)
08:48:54.300322 IP6 2001:db8:102::12.45208 > 2001:db8:102::254.53: 10057+ AAAA? abc.org.localdomain. (37)
ping: abc.org: Name or service not known
[root@localhost ~]#

Additional info:
I have attached the pcap packet,please check it,thanks.
Comment 2 Mark Michelson 2018-03-08 14:56:36 UTC 
https://patchwork.ozlabs.org/patch/882655/ has been merged into OVS master and 2.9 branches and will fix this issue.
Comment 3 haidong li 2018-04-23 07:50:25 UTC 
I have tested on version ovs 2.9.0-15.el7.fdp, the issue is verified.
test case:
ovn-test-dns1 
Job link:
https://beaker.engineering.redhat.com/recipes/4994887#task70115235
Comment 4 Timothy Redaelli 2018-05-03 14:23:25 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, 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/RHSA-2018:1267
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