1 // SPDX-License-Identifier: GPL-2.0-or-later
11  *		- things got unreadable within the protocol stack
12  *		- to cure the protocol stack from "feature-ism"
13  *		- a protocol implementation shouldn't need to know on
15  *		- user-level programs like the AX.25 utilities shouldn't
17  *		- IP over ethernet encapsulated AX.25 was impossible
18  *		- rxecho.c did not work
19  *		- to have room for extensions
20  *		- it just deserves to "live" as an own driver
23  *	limited to accept frames from one dedicated ethernet card only.
48  *						changes - 2.1.15.
105 	char   acpt_addr[6];		/* accept ether frames from this address only */
112  * form a special "super class" of normal ethernet devices; split their locks
122 	lockdep_set_class(&txq->_xmit_lock, &bpq_netdev_xmit_lock_key);  in bpq_set_lockdep_class_one()
127 	lockdep_set_class(&dev->addr_list_lock, &bpq_netdev_addr_lock_key);  in bpq_set_lockdep_class()
131 /* ------------------------------------------------------------------------ */
141 	return bpq ? bpq->ethdev : NULL;  in bpq_get_ether_dev()
153 		if (bpq->ethdev == dev)  in bpq_get_ax25_dev()
154 			return bpq->axdev;  in bpq_get_ax25_dev()
161 	return dev->type == ARPHRD_ETHER && strncmp(dev->name, "dummy", 5);  in dev_is_ethdev()
164 /* ------------------------------------------------------------------------ */
193 	 * if we want to accept frames from just one ethernet device  in bpq_rcv()
201 	if (!(bpq->acpt_addr[0] & 0x01) &&  in bpq_rcv()
202 	    !ether_addr_equal(eth->h_source, bpq->acpt_addr))  in bpq_rcv()
208 	len = skb->data[0] + skb->data[1] * 256 - 5;  in bpq_rcv()
213 	dev->stats.rx_packets++;  in bpq_rcv()
214 	dev->stats.rx_bytes += len;  in bpq_rcv()
219 	skb->protocol = ax25_type_trans(skb, dev);  in bpq_rcv()
245 	if (skb->protocol == htons(ETH_P_IP))  in bpq_xmit()
258 	size = skb->len;  in bpq_xmit()
282 		orig_dev->stats.tx_dropped++;  in bpq_xmit()
287 	skb->protocol = ax25_type_trans(skb, dev);  in bpq_xmit()
289 	dev_hard_header(skb, dev, ETH_P_BPQ, bpq->dest_addr, NULL, 0);  in bpq_xmit()
290 	dev->stats.tx_packets++;  in bpq_xmit()
291 	dev->stats.tx_bytes+=skb->len;  in bpq_xmit()
305     dev_addr_set(dev, sa->sa_data);  in bpq_set_mac_address()
325 		return -EPERM;  in bpq_siocdevprivate()
330 				return -EFAULT;  in bpq_siocdevprivate()
335 					return -EINVAL;  in bpq_siocdevprivate()
341 			if (copy_from_user(bpq->dest_addr, ethaddr->destination, ETH_ALEN))  in bpq_siocdevprivate()
342 				return -EFAULT;  in bpq_siocdevprivate()
343 			if (copy_from_user(bpq->acpt_addr, ethaddr->accept, ETH_ALEN))  in bpq_siocdevprivate()
344 				return -EFAULT;  in bpq_siocdevprivate()
348 			return -EINVAL;  in bpq_siocdevprivate()
370 /* ------------------------------------------------------------------------ */
404 		p = rcu_dereference(list_next_rcu(&bpqdev->bpq_list));  in bpq_seq_next()
425 		seq_printf(seq, "%-5s %-10s %pM  ",  in bpq_seq_show()
426 			bpqdev->axdev->name, bpqdev->ethdev->name,  in bpq_seq_show()
427 			bpqdev->dest_addr);  in bpq_seq_show()
429 		if (is_multicast_ether_addr(bpqdev->acpt_addr))  in bpq_seq_show()
432 			seq_printf(seq, "%pM\n", bpqdev->acpt_addr);  in bpq_seq_show()
445 /* ------------------------------------------------------------------------ */
457 	dev->netdev_ops	     = &bpq_netdev_ops;  in bpq_setup()
458 	dev->needs_free_netdev = true;  in bpq_setup()
460 	dev->flags      = 0;  in bpq_setup()
461 	dev->lltx = true;	/* Allow recursion */  in bpq_setup()
464 	dev->header_ops      = &ax25_header_ops;  in bpq_setup()
467 	dev->type            = ARPHRD_AX25;  in bpq_setup()
468 	dev->hard_header_len = AX25_MAX_HEADER_LEN + AX25_BPQ_HEADER_LEN;  in bpq_setup()
469 	dev->mtu             = AX25_DEF_PACLEN;  in bpq_setup()
470 	dev->addr_len        = AX25_ADDR_LEN;  in bpq_setup()
472 	memcpy(dev->broadcast, &ax25_bcast, AX25_ADDR_LEN);  in bpq_setup()
488 		return -ENOMEM;  in bpq_new_device()
493 	bpq->ethdev = edev;  in bpq_new_device()
494 	bpq->axdev = ndev;  in bpq_new_device()
496 	eth_broadcast_addr(bpq->dest_addr);  in bpq_new_device()
497 	eth_broadcast_addr(bpq->acpt_addr);  in bpq_new_device()
505 	list_add_rcu(&bpq->bpq_list, &bpq_devices);  in bpq_new_device()
519 	dev_put(bpq->ethdev);  in bpq_free_device()
520 	list_del_rcu(&bpq->bpq_list);  in bpq_free_device()
540 	case NETDEV_UP:		/* new ethernet device -> new BPQ interface */  in bpq_device_event()
545 	case NETDEV_DOWN:	/* ethernet device closed -> close BPQ interface */  in bpq_device_event()
550 	case NETDEV_UNREGISTER:	/* ethernet device removed -> free BPQ interface */  in bpq_device_event()
562 /* ------------------------------------------------------------------------ */
574 		return -ENOENT;  in bpq_init_driver()
600 		bpq_free_device(bpq->axdev);  in bpq_cleanup_driver()