2  * llc_sap.c - driver routines for SAP component.
5  * 		 2001-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
39  *	llc_alloc_frame - allocates sk_buff for frame
54 	hlen += llc_mac_header_len(dev->type);  in llc_alloc_frame()
62 		skb->protocol = htons(ETH_P_802_2);  in llc_alloc_frame()
63 		skb->dev      = dev;  in llc_alloc_frame()
74        /* save primitive for use by the user. */  in llc_save_primitive()
78 	addr->sllc_family = sk->sk_family;  in llc_save_primitive()
79 	addr->sllc_arphrd = skb->dev->type;  in llc_save_primitive()
80 	addr->sllc_test   = prim == LLC_TEST_PRIM;  in llc_save_primitive()
81 	addr->sllc_xid    = prim == LLC_XID_PRIM;  in llc_save_primitive()
82 	addr->sllc_ua     = prim == LLC_DATAUNIT_PRIM;  in llc_save_primitive()
83 	llc_pdu_decode_sa(skb, addr->sllc_mac);  in llc_save_primitive()
84 	llc_pdu_decode_ssap(skb, &addr->sllc_sap);  in llc_save_primitive()
88  *	llc_sap_rtn_pdu - Informs upper layer on rx of an UI, XID or TEST pdu.
99 		ev->prim = LLC_TEST_PRIM;	break;  in llc_sap_rtn_pdu()
101 		ev->prim = LLC_XID_PRIM;	break;  in llc_sap_rtn_pdu()
103 		ev->prim = LLC_DATAUNIT_PRIM;	break;  in llc_sap_rtn_pdu()
105 	ev->ind_cfm_flag = LLC_IND;  in llc_sap_rtn_pdu()
109  *	llc_find_sap_trans - finds transition for event
123 	struct llc_sap_state *curr_state = &llc_sap_state_table[sap->state - 1];  in llc_find_sap_trans()
128 	for (next_trans = curr_state->transitions; next_trans[i]->ev; i++)  in llc_find_sap_trans()
129 		if (!next_trans[i]->ev(sap, skb)) {  in llc_find_sap_trans()
137  *	llc_exec_sap_trans_actions - execute actions related to event
150 	const llc_sap_action_t *next_action = trans->ev_actions;  in llc_exec_sap_trans_actions()
159  *	llc_sap_next_state - finds transition, execs actions & change SAP state
172 	if (sap->state > LLC_NR_SAP_STATES)  in llc_sap_next_state()
188 	sap->state = trans->next_state;  in llc_sap_next_state()
194  *	llc_sap_state_process - sends event to SAP state machine
208 	ev->ind_cfm_flag = 0;  in llc_sap_state_process()
211 	if (ev->ind_cfm_flag == LLC_IND && skb->sk->sk_state != TCP_LISTEN) {  in llc_sap_state_process()
212 		llc_save_primitive(skb->sk, skb, ev->prim);  in llc_sap_state_process()
215 		if (sock_queue_rcv_skb(skb->sk, skb) == 0)  in llc_sap_state_process()
222  *	llc_build_and_send_test_pkt - TEST interface for upper layers.
225  *	@dmac: destination mac address
236 	ev->saddr.lsap = sap->laddr.lsap;  in llc_build_and_send_test_pkt()
237 	ev->daddr.lsap = dsap;  in llc_build_and_send_test_pkt()
238 	memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN);  in llc_build_and_send_test_pkt()
239 	memcpy(ev->daddr.mac, dmac, IFHWADDRLEN);  in llc_build_and_send_test_pkt()
241 	ev->type      = LLC_SAP_EV_TYPE_PRIM;  in llc_build_and_send_test_pkt()
242 	ev->prim      = LLC_TEST_PRIM;  in llc_build_and_send_test_pkt()
243 	ev->prim_type = LLC_PRIM_TYPE_REQ;  in llc_build_and_send_test_pkt()
248  *	llc_build_and_send_xid_pkt - XID interface for upper layers
251  *	@dmac: destination mac address
262 	ev->saddr.lsap = sap->laddr.lsap;  in llc_build_and_send_xid_pkt()
263 	ev->daddr.lsap = dsap;  in llc_build_and_send_xid_pkt()
264 	memcpy(ev->saddr.mac, skb->dev->dev_addr, IFHWADDRLEN);  in llc_build_and_send_xid_pkt()
265 	memcpy(ev->daddr.mac, dmac, IFHWADDRLEN);  in llc_build_and_send_xid_pkt()
267 	ev->type      = LLC_SAP_EV_TYPE_PRIM;  in llc_build_and_send_xid_pkt()
268 	ev->prim      = LLC_XID_PRIM;  in llc_build_and_send_xid_pkt()
269 	ev->prim_type = LLC_PRIM_TYPE_REQ;  in llc_build_and_send_xid_pkt()
274  *	llc_sap_rcv - sends received pdus to the sap state machine
286 	ev->type   = LLC_SAP_EV_TYPE_PDU;  in llc_sap_rcv()
287 	ev->reason = 0;  in llc_sap_rcv()
290 	skb->sk = sk;  in llc_sap_rcv()
291 	skb->destructor = sock_efree;  in llc_sap_rcv()
302      return sk->sk_type == SOCK_DGRAM &&  in llc_dgram_match()
304 	     llc->laddr.lsap == laddr->lsap &&  in llc_dgram_match()
305 	     ether_addr_equal(llc->laddr.mac, laddr->mac);  in llc_dgram_match()
309  *	llc_lookup_dgram - Finds dgram socket for the local sap/mac
311  *	@laddr: address of local LLC (MAC + SAP)
315  *	mac, and local sap. Returns pointer for socket found, %NULL otherwise.
324 	struct hlist_nulls_head *laddr_hb = &sap->sk_laddr_hash[slot];  in llc_lookup_dgram()
331 			if (unlikely(!refcount_inc_not_zero(&rc->sk_refcnt)))  in llc_lookup_dgram()
333 			if (unlikely(llc_sk(rc)->sap != sap ||  in llc_lookup_dgram()
361      return sk->sk_type == SOCK_DGRAM &&  in llc_mcast_match()
362 	  llc->laddr.lsap == laddr->lsap &&  in llc_mcast_match()
363 	  llc->dev == skb->dev;  in llc_mcast_match()
385  * 	llc_sap_mcast - Deliver multicast PDU's to all matching datagram sockets.
387  *	@laddr: address of local LLC (MAC + SAP)
401 	struct hlist_head *dev_hb = llc_sk_dev_hash(sap, skb->dev->ifindex);  in llc_sap_mcast()
403 	spin_lock_bh(&sap->sk_lock);  in llc_sap_mcast()
406 		sk = &llc->sk;  in llc_sap_mcast()
419 	spin_unlock_bh(&sap->sk_lock);  in llc_sap_mcast()
429 	llc_pdu_decode_da(skb, laddr.mac);  in llc_sap_handler()
432 	if (is_multicast_ether_addr(laddr.mac)) {  in llc_sap_handler()
436 		struct sock *sk = llc_lookup_dgram(sap, &laddr, dev_net(skb->dev));  in llc_sap_handler()