static int pfkey_spdget(struct sock *sk, struct sk_buff *skb, const struct sadb_msg *hdr, void * const *ext_hdrs)
{
	struct net *net = sock_net(sk);
	unsigned int dir;
	int err = 0, delete;
	struct sadb_x_policy *pol;
	struct xfrm_policy *xp;
	struct km_event c;

	if ((pol = ext_hdrs[SADB_X_EXT_POLICY-1]) == NULL)
		return -EINVAL;

	dir = xfrm_policy_id2dir(pol->sadb_x_policy_id);
	if (dir >= XFRM_POLICY_MAX)
		return -EINVAL;

	delete = (hdr->sadb_msg_type == SADB_X_SPDDELETE2);
	xp = xfrm_policy_byid(net, DUMMY_MARK, 0, XFRM_POLICY_TYPE_MAIN,
			      dir, pol->sadb_x_policy_id, delete, &err);
	if (xp == NULL)
		return -ENOENT;

	if (delete) {
		xfrm_audit_policy_delete(xp, err ? 0 : 1, true);

		if (err)
			goto out;
		c.seq = hdr->sadb_msg_seq;
		c.portid = hdr->sadb_msg_pid;
		c.data.byid = 1;
		c.event = XFRM_MSG_DELPOLICY;
		km_policy_notify(xp, dir, &c);
	} else {
		err = key_pol_get_resp(sk, xp, hdr, dir);
	}

out:
	xfrm_pol_put(xp);
	return err;
}
Unknown