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net/ipv6: Update ip6addrlbl_dump for strict data checking

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Update ip6addrlbl_dump for strict data checking. If the flag is set,
the dump request is expected to have an ifaddrlblmsg struct as the
header. All elements of the struct are expected to be 0 and no
attributes can be appended.

Signed-off-by: David Ahern <dsahern@gmail.com>
Acked-by: Christian Brauner <christian@brauner.io>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Ahern 2018-10-07 20:16:40 -07:00 committed by David S. Miller
parent 4a73e5e56d
commit f2ae64bb6b
1 changed files with 33 additions and 1 deletions
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34
net/ipv6/addrlabel.c
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@ -458,20 +458,52 @@ static int ip6addrlbl_fill(struct sk_buff *skb,
return 0;
}
static int ip6addrlbl_valid_dump_req(const struct nlmsghdr *nlh,
struct netlink_ext_ack *extack)
{
struct ifaddrlblmsg *ifal;
if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*ifal))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid header for address label dump request");
return -EINVAL;
}
ifal = nlmsg_data(nlh);
if (ifal->__ifal_reserved || ifal->ifal_prefixlen ||
ifal->ifal_flags || ifal->ifal_index || ifal->ifal_seq) {
NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for address label dump request");
return -EINVAL;
}
if (nlmsg_attrlen(nlh, sizeof(*ifal))) {
NL_SET_ERR_MSG_MOD(extack, "Invalid data after header for address label dump requewst");
return -EINVAL;
}
return 0;
}
static int ip6addrlbl_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
const struct nlmsghdr *nlh = cb->nlh;
struct net *net = sock_net(skb->sk);
struct ip6addrlbl_entry *p;
int idx = 0, s_idx = cb->args[0];
int err;
if (cb->strict_check) {
err = ip6addrlbl_valid_dump_req(nlh, cb->extack);
if (err < 0)
return err;
}
rcu_read_lock();
hlist_for_each_entry_rcu(p, &net->ipv6.ip6addrlbl_table.head, list) {
if (idx >= s_idx) {
err = ip6addrlbl_fill(skb, p,
net->ipv6.ip6addrlbl_table.seq,
NETLINK_CB(cb->skb).portid,
cb->nlh->nlmsg_seq,
nlh->nlmsg_seq,
RTM_NEWADDRLABEL,
NLM_F_MULTI);
if (err < 0)