Function lacp_pdu_input

freebsd/net/ieee8023ad_lacp.c:267–335

* lacp_pdu_input: process lacpdu */

 * lacp_pdu_input: process lacpdu
 */
static int
lacp_pdu_input(struct lacp_port *lp, struct mbuf *m)
{
	struct lacp_softc *lsc = lp->lp_lsc;
	struct lacpdu *du;
	int error = 0;

	if (m->m_pkthdr.len != sizeof(*du)) {
		goto bad;
	}

	if ((m->m_flags & M_MCAST) == 0) {
		goto bad;
	}

	if (m->m_len < sizeof(*du)) {
		m = m_pullup(m, sizeof(*du));
		if (m == NULL) {
			return (ENOMEM);
		}
	}

	du = mtod(m, struct lacpdu *);

	if (memcmp(&du->ldu_eh.ether_dhost,
	    &ethermulticastaddr_slowprotocols, ETHER_ADDR_LEN)) {
		goto bad;
	}

	/*
	 * ignore the version for compatibility with
	 * the future protocol revisions.
	 */
#if 0
	if (du->ldu_sph.sph_version != 1) {
		goto bad;
	}
#endif

	/*
	 * ignore tlv types for compatibility with
	 * the future protocol revisions.
	 */
	if (tlv_check(du, sizeof(*du), &du->ldu_tlv_actor,
	    lacp_info_tlv_template, FALSE)) {
		goto bad;
	}

        if (V_lacp_debug > 0) {
		lacp_dprintf(lp, "lacpdu receive\n");
		lacp_dump_lacpdu(du);
	}

	if ((1 << lp->lp_ifp->if_dunit) & lp->lp_lsc->lsc_debug.lsc_rx_test) {
		LACP_TPRINTF((lp, "Dropping RX PDU\n"));
		goto bad;
	}