Function pppoe_start

freebsd/netgraph/ng_pppoe.c:1260–1296

* Start a client into the first state. A separate function because * it can be needed if the negotiation times out. */

 * it can be needed if the negotiation times out.
 */
static void
pppoe_start(sessp sp)
{
	hook_p	hook = sp->hook;
	node_p	node = NG_HOOK_NODE(hook);
	priv_p	privp = NG_NODE_PRIVATE(node);
	negp	neg = sp->neg;
	struct  mbuf *m0;
	int	error;

	/*
	 * Kick the state machine into starting up.
	 */
	CTR2(KTR_NET, "%20s: called %d", __func__, sp->Session_ID);
	sp->state = PPPOE_SINIT;
	/*
	 * Reset the packet header to broadcast. Since we are
	 * in a client mode use configured ethertype.
	 */
	memcpy((void *)&neg->pkt->pkt_header.eh, &privp->eh,
	    sizeof(struct ether_header));
	neg->pkt->pkt_header.ph.code = PADI_CODE;
	init_tags(sp);
	insert_tag(sp, &neg->host_uniq.hdr);
	insert_tag(sp, &neg->service.hdr);
	if (privp->max_payload.data != 0)
		insert_tag(sp, &privp->max_payload.hdr);
	make_packet(sp);
	/*
	 * Send packet and prepare to retransmit it after timeout.
	 */
	ng_callout(&neg->handle, node, hook, PPPOE_INITIAL_TIMEOUT * hz,
	    pppoe_ticker, NULL, 0);
	neg->timeout = PPPOE_INITIAL_TIMEOUT * 2;
	m0 = m_copypacket(neg->m, M_NOWAIT);
	NG_SEND_DATA_ONLY(error, privp->ethernet_hook, m0);
}

static int
send_acname(sessp sp, const struct pppoe_tag *tag)