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netlink: Disable duplicate address detection for configured IPv6 address

With default options, when we pass --config-net, the IPv6 address is
actually going to be recycled from the init namespace, so it is in
fact duplicated, but duplicate address detection has no way to find
out.

With a different configured address, that's not the case, but anyway
duplicate address detection will be unable to see this.

In both cases, we're wasting time for nothing.

Pass the IFA_F_NODAD flag as we configure globally scoped IPv6
addresses via netlink.

Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Stefano Brivio 2022-10-11 00:36:30 +02:00
parent 6f3e38cac5
commit 6acf89638b

View File

@ -343,6 +343,9 @@ void nl_addr(int ns, unsigned int ifi, sa_family_t af,
if (af == AF_INET6) {
size_t rta_len = RTA_LENGTH(sizeof(req.set.a6.l));
/* By default, strictly speaking, it's duplicated */
req.ifa.ifa_flags = IFA_F_NODAD;
req.nlh.nlmsg_len = offsetof(struct req_t, set.a6)
+ sizeof(req.set.a6);