[radvd-devel-l] Wrongly picks and advertises /80 IPs

[Roman Mamedov]

Hello,

radvd.conf:

interface eth1.2 {
    AdvSendAdvert on;
    AdvManagedFlag on;
    AdvLinkMTU 1492;
    prefix ::/64 { };
    RDNSS fd39::39 { };
    DNSSL romanrm.ru romanrm.net romanrm.hk version6.ru { };
};

Interface:

eth1.2    Link encap:Ethernet  HWaddr 00:60:6e:20:25:99  
          inet addr:192.168.2.39  Bcast:192.168.2.255  Mask:255.255.255.0
          inet6 addr: 2a02:2698:xxxx:xxxx:fff2::39/80 Scope:Global
          inet6 addr: fd39:0:2::39/64 Scope:Global
          inet6 addr: fe80::260:6eff:fe20:2599/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1492  Metric:1
          RX packets:5577 errors:0 dropped:0 overruns:0 frame:0
          TX packets:4016 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0 
          RX bytes:477626 (466.4 KiB)  TX bytes:434209 (424.0 KiB)


radvdump on the client:

#
# radvd configuration generated by radvdump 1.8.5
# based on Router Advertisement from fe80::260:6eff:fe20:2599
# received by interface eth1
#

interface eth1
{
	AdvSendAdvert on;
	# Note: {Min,Max}RtrAdvInterval cannot be obtained with radvdump
	AdvManagedFlag on;
	AdvOtherConfigFlag off;
	AdvReachableTime 0;
	AdvRetransTimer 0;
	AdvCurHopLimit 64;
	AdvDefaultLifetime 1800;
	AdvHomeAgentFlag off;
	AdvDefaultPreference medium;
	AdvLinkMTU 1492;
	AdvSourceLLAddress on;

	prefix fd39:0:2::/64
	{
		AdvValidLifetime 86400;
		AdvPreferredLifetime 14400;
		AdvOnLink on;
		AdvAutonomous on;
		AdvRouterAddr on;
	}; # End of prefix definition


	prefix 2a02:2698:xxxx:xxxx:fff2::/80
	{
		AdvValidLifetime 86400;
		AdvPreferredLifetime 14400;
		AdvOnLink on;
		AdvAutonomous on;
		AdvRouterAddr on;
	}; # End of prefix definition


	RDNSS fd39::39
	{
		AdvRDNSSLifetime 600;
	}; # End of RDNSS definition


	DNSSL romanrm.ru romanrm.net romanrm.hk version6.ru
	{
		AdvDNSSLLifetime 600;
	}; # End of DNSSL definition

}; # End of interface definition

-----

The config clearly states "prefix ::/64".
RADVD should not have picked the /80 IP to advertise as a /80 prefix.
This IP should have been ignored.
This particular IP was never intended by me for RA, and the client
now spams the log with

[338607.660000] IPv6 addrconf: prefix with wrong length 80
[338623.680000] IPv6 addrconf: prefix with wrong length 80
[338639.710000] IPv6 addrconf: prefix with wrong length 80


-- 
With respect,
Roman
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