ipv6: addrconf: add missing validate_link_af handler

We still need a validate_link_af() handler with an appropriate nla policy,
similarly as we have in IPv4 case, otherwise size validations are not being
done properly in that case.

Fixes: f53adae4eae5 ("net: ipv6: add tokenized interface identifier support")
Fixes: bc91b0f07ada ("ipv6: addrconf: implement address generation modes")
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 17 insertions, 0 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 62900aee4c58..754e683240f9 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4587,6 +4587,22 @@ static int inet6_set_iftoken(struct inet6_dev *idev, struct in6_addr *token)
         return 0;
 }
 
+static const struct nla_policy inet6_af_policy[IFLA_INET6_MAX + 1] = {
+        [IFLA_INET6_ADDR_GEN_MODE]      = { .type = NLA_U8 },
+        [IFLA_INET6_TOKEN]              = { .len = sizeof(struct in6_addr) },
+};
+
+static int inet6_validate_link_af(const struct net_device *dev,
+                                  const struct nlattr *nla)
+{
+        struct nlattr *tb[IFLA_INET6_MAX + 1];
+
+        if (dev && !__in6_dev_get(dev))
+                return -EAFNOSUPPORT;
+
+        return nla_parse_nested(tb, IFLA_INET6_MAX, nla, inet6_af_policy);
+}
+
 static int inet6_set_link_af(struct net_device *dev, const struct nlattr *nla)
 {
         int err = -EINVAL;
@@ -5408,6 +5424,7 @@ static struct rtnl_af_ops inet6_ops = {
         .family           = AF_INET6,
         .fill_link_af     = inet6_fill_link_af,
         .get_link_af_size = inet6_get_link_af_size,
+        .validate_link_af = inet6_validate_link_af,
         .set_link_af      = inet6_set_link_af,
 };