[lvs-users] IPv6 Unique Local address virtual server with IPv6 link local address real server

[Julian Anastasov]

	Hello,

On Wed, 30 May 2018, SankaraNarayanan S wrote:

> Hello Team,
> 
> 
> 
>           Is it possible to add IPv6 Unique Local address virtual server with IPv6 link local address real server. I tried and get the error mentioned below 
> 
> 
> 
> 
> 
> root at l3-newversion-1~#ipvsadm -a -t [fd21:d1aa:194a:3515:0:1:0:0]:80 -r [fe80::5054:ff:fe35:a011]:80

	It is possible only if RIP is local IP, not for
remote link-local addresses. See this commit:

commit 3bfb92f4073aa829f8e67e459d54c79306ddbd73
Author: Sven Wegener <sven.wegener at stealer.net>
Date:   Fri Sep 5 16:53:49 2008 +0200

    ipvs: Reject ipv6 link-local addresses for destinations
    
    We can't use non-local link-local addresses for destinations, without
    knowing the interface on which we can reach the address. Reject them for
    now.

...

@@ -838,7 +838,8 @@ ip_vs_new_dest(struct ip_vs_service *svc, struct 
ip_vs_dest_user_kern *udest,
 #ifdef CONFIG_IP_VS_IPV6
        if (svc->af == AF_INET6) {
                atype = ipv6_addr_type(&udest->addr.in6);
-               if (!(atype & IPV6_ADDR_UNICAST) &&
+               if ((!(atype & IPV6_ADDR_UNICAST) ||
+                       atype & IPV6_ADDR_LINKLOCAL) &&
                        !__ip_vs_addr_is_local_v6(&udest->addr.in6))
                        return -EINVAL;
        } else

Regards

--
Julian Anastasov <ja at ssi.bg>