mirror of
https://github.com/torvalds/linux.git
synced 2025-11-04 02:30:34 +02:00
ce1afe2804
W=1 builds now warn if module is built without a MODULE_DESCRIPTION(). Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
179 lines
4.8 KiB
C
179 lines
4.8 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* FDDI-type device handling.
|
|
*
|
|
* Version: @(#)fddi.c 1.0.0 08/12/96
|
|
*
|
|
* Authors: Lawrence V. Stefani, <stefani@lkg.dec.com>
|
|
*
|
|
* fddi.c is based on previous eth.c and tr.c work by
|
|
* Ross Biro
|
|
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
|
* Mark Evans, <evansmp@uhura.aston.ac.uk>
|
|
* Florian La Roche, <rzsfl@rz.uni-sb.de>
|
|
* Alan Cox, <gw4pts@gw4pts.ampr.org>
|
|
*
|
|
* Changes
|
|
* Alan Cox : New arp/rebuild header
|
|
* Maciej W. Rozycki : IPv6 support
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/string.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/socket.h>
|
|
#include <linux/in.h>
|
|
#include <linux/inet.h>
|
|
#include <linux/netdevice.h>
|
|
#include <linux/fddidevice.h>
|
|
#include <linux/if_ether.h>
|
|
#include <linux/skbuff.h>
|
|
#include <linux/errno.h>
|
|
#include <net/arp.h>
|
|
#include <net/sock.h>
|
|
|
|
/*
|
|
* Create the FDDI MAC header for an arbitrary protocol layer
|
|
*
|
|
* saddr=NULL means use device source address
|
|
* daddr=NULL means leave destination address (eg unresolved arp)
|
|
*/
|
|
|
|
static int fddi_header(struct sk_buff *skb, struct net_device *dev,
|
|
unsigned short type,
|
|
const void *daddr, const void *saddr, unsigned int len)
|
|
{
|
|
int hl = FDDI_K_SNAP_HLEN;
|
|
struct fddihdr *fddi;
|
|
|
|
if(type != ETH_P_IP && type != ETH_P_IPV6 && type != ETH_P_ARP)
|
|
hl=FDDI_K_8022_HLEN-3;
|
|
fddi = skb_push(skb, hl);
|
|
fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF;
|
|
if(type == ETH_P_IP || type == ETH_P_IPV6 || type == ETH_P_ARP)
|
|
{
|
|
fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP;
|
|
fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP;
|
|
fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD;
|
|
fddi->hdr.llc_snap.oui[0] = 0x00;
|
|
fddi->hdr.llc_snap.oui[1] = 0x00;
|
|
fddi->hdr.llc_snap.oui[2] = 0x00;
|
|
fddi->hdr.llc_snap.ethertype = htons(type);
|
|
}
|
|
|
|
/* Set the source and destination hardware addresses */
|
|
|
|
if (saddr != NULL)
|
|
memcpy(fddi->saddr, saddr, dev->addr_len);
|
|
else
|
|
memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
|
|
|
|
if (daddr != NULL)
|
|
{
|
|
memcpy(fddi->daddr, daddr, dev->addr_len);
|
|
return hl;
|
|
}
|
|
|
|
return -hl;
|
|
}
|
|
|
|
/*
|
|
* Determine the packet's protocol ID and fill in skb fields.
|
|
* This routine is called before an incoming packet is passed
|
|
* up. It's used to fill in specific skb fields and to set
|
|
* the proper pointer to the start of packet data (skb->data).
|
|
*/
|
|
|
|
__be16 fddi_type_trans(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct fddihdr *fddi = (struct fddihdr *)skb->data;
|
|
__be16 type;
|
|
|
|
/*
|
|
* Set mac.raw field to point to FC byte, set data field to point
|
|
* to start of packet data. Assume 802.2 SNAP frames for now.
|
|
*/
|
|
|
|
skb->dev = dev;
|
|
skb_reset_mac_header(skb); /* point to frame control (FC) */
|
|
|
|
if(fddi->hdr.llc_8022_1.dsap==0xe0)
|
|
{
|
|
skb_pull(skb, FDDI_K_8022_HLEN-3);
|
|
type = htons(ETH_P_802_2);
|
|
}
|
|
else
|
|
{
|
|
skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */
|
|
type=fddi->hdr.llc_snap.ethertype;
|
|
}
|
|
|
|
/* Set packet type based on destination address and flag settings */
|
|
|
|
if (*fddi->daddr & 0x01)
|
|
{
|
|
if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
|
|
skb->pkt_type = PACKET_BROADCAST;
|
|
else
|
|
skb->pkt_type = PACKET_MULTICAST;
|
|
}
|
|
|
|
else if (dev->flags & IFF_PROMISC)
|
|
{
|
|
if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
|
|
skb->pkt_type = PACKET_OTHERHOST;
|
|
}
|
|
|
|
/* Assume 802.2 SNAP frames, for now */
|
|
|
|
return type;
|
|
}
|
|
|
|
EXPORT_SYMBOL(fddi_type_trans);
|
|
|
|
static const struct header_ops fddi_header_ops = {
|
|
.create = fddi_header,
|
|
};
|
|
|
|
|
|
static void fddi_setup(struct net_device *dev)
|
|
{
|
|
dev->header_ops = &fddi_header_ops;
|
|
dev->type = ARPHRD_FDDI;
|
|
dev->hard_header_len = FDDI_K_SNAP_HLEN+3; /* Assume 802.2 SNAP hdr len + 3 pad bytes */
|
|
dev->mtu = FDDI_K_SNAP_DLEN; /* Assume max payload of 802.2 SNAP frame */
|
|
dev->min_mtu = FDDI_K_SNAP_HLEN;
|
|
dev->max_mtu = FDDI_K_SNAP_DLEN;
|
|
dev->addr_len = FDDI_K_ALEN;
|
|
dev->tx_queue_len = 100; /* Long queues on FDDI */
|
|
dev->flags = IFF_BROADCAST | IFF_MULTICAST;
|
|
|
|
memset(dev->broadcast, 0xFF, FDDI_K_ALEN);
|
|
}
|
|
|
|
/**
|
|
* alloc_fddidev - Register FDDI device
|
|
* @sizeof_priv: Size of additional driver-private structure to be allocated
|
|
* for this FDDI device
|
|
*
|
|
* Fill in the fields of the device structure with FDDI-generic values.
|
|
*
|
|
* Constructs a new net device, complete with a private data area of
|
|
* size @sizeof_priv. A 32-byte (not bit) alignment is enforced for
|
|
* this private data area.
|
|
*/
|
|
struct net_device *alloc_fddidev(int sizeof_priv)
|
|
{
|
|
return alloc_netdev(sizeof_priv, "fddi%d", NET_NAME_UNKNOWN,
|
|
fddi_setup);
|
|
}
|
|
EXPORT_SYMBOL(alloc_fddidev);
|
|
|
|
MODULE_DESCRIPTION("Core routines for FDDI network devices");
|
|
MODULE_LICENSE("GPL");
|