1 // SPDX-License-Identifier: GPL-2.0-or-later
7  *		FDDI-type device handling.
13  *		fddi.c is based on previous eth.c and tr.c work by
17  *			Florian La Roche, <[email protected]-sb.de>
56 		hl=FDDI_K_8022_HLEN-3;  in fddi_header()
58 	fddi->fc			 = FDDI_FC_K_ASYNC_LLC_DEF;  in fddi_header()
61 		fddi->hdr.llc_snap.dsap		 = FDDI_EXTENDED_SAP;  in fddi_header()
62 		fddi->hdr.llc_snap.ssap		 = FDDI_EXTENDED_SAP;  in fddi_header()
63 		fddi->hdr.llc_snap.ctrl		 = FDDI_UI_CMD;  in fddi_header()
64 		fddi->hdr.llc_snap.oui[0]	 = 0x00;  in fddi_header()
65 		fddi->hdr.llc_snap.oui[1]	 = 0x00;  in fddi_header()
66 		fddi->hdr.llc_snap.oui[2]	 = 0x00;  in fddi_header()
67 		fddi->hdr.llc_snap.ethertype	 = htons(type);  in fddi_header()
73 		memcpy(fddi->saddr, saddr, dev->addr_len);  in fddi_header()
75 		memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);  in fddi_header()
79 		memcpy(fddi->daddr, daddr, dev->addr_len);  in fddi_header()
83 	return -hl;  in fddi_header()
87  * Determine the packet's protocol ID and fill in skb fields.
88  * This routine is called before an incoming packet is passed
90  * the proper pointer to the start of packet data (skb->data).
95 	struct fddihdr *fddi = (struct fddihdr *)skb->data;  in fddi_type_trans()
100 	 * to start of packet data.  Assume 802.2 SNAP frames for now.  in fddi_type_trans()
103 	skb->dev = dev;  in fddi_type_trans()
106 	if(fddi->hdr.llc_8022_1.dsap==0xe0)  in fddi_type_trans()
108 		skb_pull(skb, FDDI_K_8022_HLEN-3);  in fddi_type_trans()
114 		type=fddi->hdr.llc_snap.ethertype;  in fddi_type_trans()
117 	/* Set packet type based on destination address and flag settings */  in fddi_type_trans()
119 	if (*fddi->daddr & 0x01)  in fddi_type_trans()
121 		if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)  in fddi_type_trans()
122 			skb->pkt_type = PACKET_BROADCAST;  in fddi_type_trans()
124 			skb->pkt_type = PACKET_MULTICAST;  in fddi_type_trans()
127 	else if (dev->flags & IFF_PROMISC)  in fddi_type_trans()
129 		if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))  in fddi_type_trans()
130 			skb->pkt_type = PACKET_OTHERHOST;  in fddi_type_trans()
147 	dev->header_ops		= &fddi_header_ops;  in fddi_setup()
148 	dev->type		= ARPHRD_FDDI;  in fddi_setup()
149 	dev->hard_header_len	= FDDI_K_SNAP_HLEN+3;	/* Assume 802.2 SNAP hdr len + 3 pad bytes */  in fddi_setup()
150 	dev->mtu		= FDDI_K_SNAP_DLEN;	/* Assume max payload of 802.2 SNAP frame */  in fddi_setup()
151 	dev->min_mtu		= FDDI_K_SNAP_HLEN;  in fddi_setup()
152 	dev->max_mtu		= FDDI_K_SNAP_DLEN;  in fddi_setup()
153 	dev->addr_len		= FDDI_K_ALEN;  in fddi_setup()
154 	dev->tx_queue_len	= 100;			/* Long queues on FDDI */  in fddi_setup()
155 	dev->flags		= IFF_BROADCAST | IFF_MULTICAST;  in fddi_setup()
157 	memset(dev->broadcast, 0xFF, FDDI_K_ALEN);  in fddi_setup()
161  * alloc_fddidev - Register FDDI device
162  * @sizeof_priv: Size of additional driver-private structure to be allocated
165  * Fill in the fields of the device structure with FDDI-generic values.
168  * size @sizeof_priv.  A 32-byte (not bit) alignment is enforced for