@@ -523,6 +523,50 @@ static inline int ip6addrlbl_msgsize(void)
+ nla_total_size(4); /* IFAL_LABEL */
}
+static int ip6addrlbl_valid_get_req(struct sk_buff *skb,
+ const struct nlmsghdr *nlh,
+ struct nlattr **tb,
+ struct netlink_ext_ack *extack)
+{
+ struct ifaddrlblmsg *ifal;
+ int i, err;
+
+ if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
+ NL_SET_ERR_MSG_MOD(extack, "Invalid header for addrlabel get request");
+ return -EINVAL;
+ }
+
+ if (!netlink_strict_get_check(skb))
+ return nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX,
+ ifal_policy, extack);
+
+ ifal = nlmsg_data(nlh);
+ if (ifal->__ifal_reserved || ifal->ifal_flags || ifal->ifal_seq) {
+ NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for addrlabel get request");
+ return -EINVAL;
+ }
+
+ err = nlmsg_parse_strict(nlh, sizeof(*ifal), tb, IFAL_MAX,
+ ifal_policy, extack);
+ if (err)
+ return err;
+
+ for (i = 0; i <= IFAL_MAX; i++) {
+ if (!tb[i])
+ continue;
+
+ switch (i) {
+ case IFAL_ADDRESS:
+ break;
+ default:
+ NL_SET_ERR_MSG_MOD(extack, "Unsupported attribute in addrlabel get request");
+ return -EINVAL;
+ }
+ }
+
+ return 0;
+}
+
static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
@@ -535,8 +579,7 @@ static int ip6addrlbl_get(struct sk_buff *in_skb, struct nlmsghdr *nlh,
struct ip6addrlbl_entry *p;
struct sk_buff *skb;
- err = nlmsg_parse(nlh, sizeof(*ifal), tb, IFAL_MAX, ifal_policy,
- extack);
+ err = ip6addrlbl_valid_get_req(in_skb, nlh, tb, extack);
if (err < 0)
return err;
Make RTM_GETADDRLABEL's doit handler use strict checks when NETLINK_F_STRICT_CHK is set. Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com> --- net/ipv6/addrlabel.c | 47 ++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 45 insertions(+), 2 deletions(-)