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178 lines
4.7 KiB
178 lines
4.7 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* INET An implementation of the TCP/IP protocol suite for the LINUX |
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* operating system. INET is implemented using the BSD Socket |
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* interface as the means of communication with the user level. |
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* |
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* FDDI-type device handling. |
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* |
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* Version: @(#)fddi.c 1.0.0 08/12/96 |
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* |
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* Authors: Lawrence V. Stefani, <[email protected]> |
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* |
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* fddi.c is based on previous eth.c and tr.c work by |
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* Ross Biro |
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* Fred N. van Kempen, <[email protected]> |
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* Mark Evans, <[email protected]> |
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* Florian La Roche, <[email protected]> |
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* Alan Cox, <[email protected]> |
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* |
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* Changes |
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* Alan Cox : New arp/rebuild header |
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* Maciej W. Rozycki : IPv6 support |
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*/ |
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#include <linux/module.h> |
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#include <linux/types.h> |
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#include <linux/kernel.h> |
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#include <linux/string.h> |
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#include <linux/mm.h> |
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#include <linux/socket.h> |
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#include <linux/in.h> |
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#include <linux/inet.h> |
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#include <linux/netdevice.h> |
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#include <linux/fddidevice.h> |
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#include <linux/if_ether.h> |
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#include <linux/skbuff.h> |
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#include <linux/errno.h> |
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#include <net/arp.h> |
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#include <net/sock.h> |
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/* |
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* Create the FDDI MAC header for an arbitrary protocol layer |
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* |
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* saddr=NULL means use device source address |
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* daddr=NULL means leave destination address (eg unresolved arp) |
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*/ |
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static int fddi_header(struct sk_buff *skb, struct net_device *dev, |
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unsigned short type, |
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const void *daddr, const void *saddr, unsigned int len) |
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{ |
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int hl = FDDI_K_SNAP_HLEN; |
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struct fddihdr *fddi; |
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if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP) |
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hl=FDDI_K_8022_HLEN-3; |
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fddi = skb_push(skb, hl); |
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fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF; |
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if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP) |
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{ |
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fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP; |
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fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP; |
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fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD; |
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fddi->hdr.llc_snap.oui[0] = 0x00; |
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fddi->hdr.llc_snap.oui[1] = 0x00; |
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fddi->hdr.llc_snap.oui[2] = 0x00; |
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fddi->hdr.llc_snap.ethertype = htons(type); |
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} |
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/* Set the source and destination hardware addresses */ |
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if (saddr != NULL) |
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memcpy(fddi->saddr, saddr, dev->addr_len); |
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else |
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memcpy(fddi->saddr, dev->dev_addr, dev->addr_len); |
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if (daddr != NULL) |
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{ |
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memcpy(fddi->daddr, daddr, dev->addr_len); |
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return hl; |
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} |
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return -hl; |
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} |
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/* |
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* Determine the packet's protocol ID and fill in skb fields. |
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* This routine is called before an incoming packet is passed |
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* up. It's used to fill in specific skb fields and to set |
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* the proper pointer to the start of packet data (skb->data). |
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*/ |
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__be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev) |
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{ |
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struct fddihdr *fddi = (struct fddihdr *)skb->data; |
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__be16 type; |
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/* |
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* Set mac.raw field to point to FC byte, set data field to point |
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* to start of packet data. Assume 802.2 SNAP frames for now. |
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*/ |
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skb->dev = dev; |
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skb_reset_mac_header(skb); /* point to frame control (FC) */ |
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if(fddi->hdr.llc_8022_1.dsap==0xe0) |
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{ |
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skb_pull(skb, FDDI_K_8022_HLEN-3); |
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type = htons(ETH_P_802_2); |
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} |
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else |
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{ |
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skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */ |
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type=fddi->hdr.llc_snap.ethertype; |
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} |
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/* Set packet type based on destination address and flag settings */ |
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if (*fddi->daddr & 0x01) |
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{ |
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if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0) |
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skb->pkt_type = PACKET_BROADCAST; |
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else |
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skb->pkt_type = PACKET_MULTICAST; |
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} |
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else if (dev->flags & IFF_PROMISC) |
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{ |
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if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN)) |
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skb->pkt_type = PACKET_OTHERHOST; |
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} |
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/* Assume 802.2 SNAP frames, for now */ |
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return type; |
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} |
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EXPORT_SYMBOL(fddi_type_trans); |
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static const struct header_ops fddi_header_ops = { |
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.create = fddi_header, |
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}; |
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static void fddi_setup(struct net_device *dev) |
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{ |
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dev->header_ops = &fddi_header_ops; |
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dev->type = ARPHRD_FDDI; |
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dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */ |
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dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */ |
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dev->min_mtu = FDDI_K_SNAP_HLEN; |
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dev->max_mtu = FDDI_K_SNAP_DLEN; |
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dev->addr_len = FDDI_K_ALEN; |
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dev->tx_queue_len = 100; /* Long queues on FDDI */ |
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dev->flags = IFF_BROADCAST | IFF_MULTICAST; |
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memset(dev->broadcast, 0xFF, FDDI_K_ALEN); |
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} |
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/** |
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* alloc_fddidev - Register FDDI device |
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* @sizeof_priv: Size of additional driver-private structure to be allocated |
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* for this FDDI device |
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* |
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* Fill in the fields of the device structure with FDDI-generic values. |
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* |
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* Constructs a new net device, complete with a private data area of |
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* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for |
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* this private data area. |
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*/ |
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struct net_device *alloc_fddidev(int sizeof_priv) |
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{ |
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return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN, |
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fddi_setup); |
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} |
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EXPORT_SYMBOL(alloc_fddidev); |
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MODULE_LICENSE("GPL");
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