static int selinux_sock_rcv_skb_compat(struct sock *sk, struct sk_buff *skb,
				       u16 family)
{
	int err = 0;
	struct sk_security_struct *sksec = sk->sk_security;
	u32 sk_sid = sksec->sid;
	struct common_audit_data ad;
	struct lsm_network_audit net = {0,};
	char *addrp;

	ad.type = LSM_AUDIT_DATA_NET;
	ad.u.net = &net;
	ad.u.net->netif = skb->skb_iif;
	ad.u.net->family = family;
	err = selinux_parse_skb(skb, &ad, &addrp, 1, NULL);
	if (err)
		return err;

	if (selinux_secmark_enabled()) {
		err = avc_has_perm(sk_sid, skb->secmark, SECCLASS_PACKET,
				   PACKET__RECV, &ad);
		if (err)
			return err;
	}

	err = selinux_netlbl_sock_rcv_skb(sksec, skb, family, &ad);
	if (err)
		return err;
	err = selinux_xfrm_sock_rcv_skb(sksec->sid, skb, &ad);

	return err;
}
Unknown