| 1 |
199 |
simons |
/*
|
| 2 |
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
| 3 |
|
|
* operating system. INET is implemented using the BSD Socket
|
| 4 |
|
|
* interface as the means of communication with the user level.
|
| 5 |
|
|
*
|
| 6 |
|
|
* FDDI-type device handling.
|
| 7 |
|
|
*
|
| 8 |
|
|
* Version: @(#)fddi.c 1.0.0 08/12/96
|
| 9 |
|
|
*
|
| 10 |
|
|
* Authors: Lawrence V. Stefani, <stefani@lkg.dec.com>
|
| 11 |
|
|
*
|
| 12 |
|
|
* fddi.c is based on previous eth.c and tr.c work by
|
| 13 |
|
|
* Ross Biro, <bir7@leland.Stanford.Edu>
|
| 14 |
|
|
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
| 15 |
|
|
* Mark Evans, <evansmp@uhura.aston.ac.uk>
|
| 16 |
|
|
* Florian La Roche, <rzsfl@rz.uni-sb.de>
|
| 17 |
|
|
* Alan Cox, <gw4pts@gw4pts.ampr.org>
|
| 18 |
|
|
*
|
| 19 |
|
|
* This program is free software; you can redistribute it and/or
|
| 20 |
|
|
* modify it under the terms of the GNU General Public License
|
| 21 |
|
|
* as published by the Free Software Foundation; either version
|
| 22 |
|
|
* 2 of the License, or (at your option) any later version.
|
| 23 |
|
|
*/
|
| 24 |
|
|
#include <asm/segment.h>
|
| 25 |
|
|
#include <asm/system.h>
|
| 26 |
|
|
#include <linux/types.h>
|
| 27 |
|
|
#include <linux/kernel.h>
|
| 28 |
|
|
#include <linux/sched.h>
|
| 29 |
|
|
#include <linux/string.h>
|
| 30 |
|
|
#include <linux/mm.h>
|
| 31 |
|
|
#include <linux/socket.h>
|
| 32 |
|
|
#include <linux/in.h>
|
| 33 |
|
|
#include <linux/inet.h>
|
| 34 |
|
|
#include <linux/netdevice.h>
|
| 35 |
|
|
#include <linux/fddidevice.h>
|
| 36 |
|
|
#include <linux/skbuff.h>
|
| 37 |
|
|
#include <linux/errno.h>
|
| 38 |
|
|
#include <net/arp.h>
|
| 39 |
|
|
#include <net/sock.h>
|
| 40 |
|
|
|
| 41 |
|
|
/*
|
| 42 |
|
|
* Create the FDDI MAC header for an arbitrary protocol layer
|
| 43 |
|
|
*
|
| 44 |
|
|
* saddr=NULL means use device source address
|
| 45 |
|
|
* daddr=NULL means leave destination address (eg unresolved arp)
|
| 46 |
|
|
*/
|
| 47 |
|
|
|
| 48 |
|
|
int fddi_header(
|
| 49 |
|
|
struct sk_buff *skb,
|
| 50 |
|
|
struct device *dev,
|
| 51 |
|
|
unsigned short type,
|
| 52 |
|
|
void *daddr,
|
| 53 |
|
|
void *saddr,
|
| 54 |
|
|
unsigned len
|
| 55 |
|
|
)
|
| 56 |
|
|
|
| 57 |
|
|
{
|
| 58 |
|
|
struct fddihdr *fddi = (struct fddihdr *)skb_push(skb, FDDI_K_SNAP_HLEN);
|
| 59 |
|
|
|
| 60 |
|
|
/* Fill in frame header - assume 802.2 SNAP frames for now */
|
| 61 |
|
|
|
| 62 |
|
|
fddi->fc = FDDI_FC_K_ASYNC_LLC_DEF;
|
| 63 |
|
|
fddi->hdr.llc_snap.dsap = FDDI_EXTENDED_SAP;
|
| 64 |
|
|
fddi->hdr.llc_snap.ssap = FDDI_EXTENDED_SAP;
|
| 65 |
|
|
fddi->hdr.llc_snap.ctrl = FDDI_UI_CMD;
|
| 66 |
|
|
fddi->hdr.llc_snap.oui[0] = 0x00;
|
| 67 |
|
|
fddi->hdr.llc_snap.oui[1] = 0x00;
|
| 68 |
|
|
fddi->hdr.llc_snap.oui[2] = 0x00;
|
| 69 |
|
|
fddi->hdr.llc_snap.ethertype = htons(type);
|
| 70 |
|
|
|
| 71 |
|
|
/* Set the source and destination hardware addresses */
|
| 72 |
|
|
|
| 73 |
|
|
if (saddr != NULL)
|
| 74 |
|
|
memcpy(fddi->saddr, saddr, dev->addr_len);
|
| 75 |
|
|
else
|
| 76 |
|
|
memcpy(fddi->saddr, dev->dev_addr, dev->addr_len);
|
| 77 |
|
|
|
| 78 |
|
|
if (daddr != NULL)
|
| 79 |
|
|
{
|
| 80 |
|
|
memcpy(fddi->daddr, daddr, dev->addr_len);
|
| 81 |
|
|
return(FDDI_K_SNAP_HLEN);
|
| 82 |
|
|
}
|
| 83 |
|
|
return(-FDDI_K_SNAP_HLEN);
|
| 84 |
|
|
}
|
| 85 |
|
|
|
| 86 |
|
|
|
| 87 |
|
|
/*
|
| 88 |
|
|
* Rebuild the FDDI MAC header. This is called after an ARP
|
| 89 |
|
|
* (or in future other address resolution) has completed on
|
| 90 |
|
|
* this sk_buff. We now let ARP fill in the other fields.
|
| 91 |
|
|
*/
|
| 92 |
|
|
|
| 93 |
|
|
int fddi_rebuild_header(
|
| 94 |
|
|
void *buff,
|
| 95 |
|
|
struct device *dev,
|
| 96 |
|
|
unsigned long dest,
|
| 97 |
|
|
struct sk_buff *skb
|
| 98 |
|
|
)
|
| 99 |
|
|
|
| 100 |
|
|
{
|
| 101 |
|
|
struct fddihdr *fddi = (struct fddihdr *)buff;
|
| 102 |
|
|
|
| 103 |
|
|
/* Only ARP/IP is currently supported */
|
| 104 |
|
|
|
| 105 |
|
|
if (fddi->hdr.llc_snap.ethertype != htons(ETH_P_IP))
|
| 106 |
|
|
{
|
| 107 |
|
|
printk("fddi_rebuild_header: Don't know how to resolve type %04X addresses?\n", (unsigned int)htons(fddi->hdr.llc_snap.ethertype));
|
| 108 |
|
|
return(0);
|
| 109 |
|
|
}
|
| 110 |
|
|
|
| 111 |
|
|
/* Try to get ARP to resolve the header and fill destination address */
|
| 112 |
|
|
|
| 113 |
|
|
if (arp_find(fddi->daddr, dest, dev, dev->pa_addr, skb))
|
| 114 |
|
|
return(1);
|
| 115 |
|
|
else
|
| 116 |
|
|
return(0);
|
| 117 |
|
|
}
|
| 118 |
|
|
|
| 119 |
|
|
|
| 120 |
|
|
/*
|
| 121 |
|
|
* Determine the packet's protocol ID and fill in skb fields.
|
| 122 |
|
|
* This routine is called before an incoming packet is passed
|
| 123 |
|
|
* up. It's used to fill in specific skb fields and to set
|
| 124 |
|
|
* the proper pointer to the start of packet data (skb->data).
|
| 125 |
|
|
*/
|
| 126 |
|
|
|
| 127 |
|
|
unsigned short fddi_type_trans(
|
| 128 |
|
|
struct sk_buff *skb,
|
| 129 |
|
|
struct device *dev
|
| 130 |
|
|
)
|
| 131 |
|
|
|
| 132 |
|
|
{
|
| 133 |
|
|
struct fddihdr *fddi = (struct fddihdr *)skb->data;
|
| 134 |
|
|
|
| 135 |
|
|
/*
|
| 136 |
|
|
* Set mac.raw field to point to FC byte, set data field to point
|
| 137 |
|
|
* to start of packet data. Assume 802.2 SNAP frames for now.
|
| 138 |
|
|
*/
|
| 139 |
|
|
|
| 140 |
|
|
skb->mac.raw = skb->data; /* point to frame control (FC) */
|
| 141 |
|
|
skb_pull(skb, FDDI_K_SNAP_HLEN); /* adjust for 21 byte header */
|
| 142 |
|
|
|
| 143 |
|
|
/* Set packet type based on destination address and flag settings */
|
| 144 |
|
|
|
| 145 |
|
|
if (*fddi->daddr & 0x01)
|
| 146 |
|
|
{
|
| 147 |
|
|
if (memcmp(fddi->daddr, dev->broadcast, FDDI_K_ALEN) == 0)
|
| 148 |
|
|
skb->pkt_type = PACKET_BROADCAST;
|
| 149 |
|
|
else
|
| 150 |
|
|
skb->pkt_type = PACKET_MULTICAST;
|
| 151 |
|
|
}
|
| 152 |
|
|
|
| 153 |
|
|
else if (dev->flags & IFF_PROMISC)
|
| 154 |
|
|
{
|
| 155 |
|
|
if (memcmp(fddi->daddr, dev->dev_addr, FDDI_K_ALEN))
|
| 156 |
|
|
skb->pkt_type = PACKET_OTHERHOST;
|
| 157 |
|
|
}
|
| 158 |
|
|
|
| 159 |
|
|
/* Assume 802.2 SNAP frames, for now */
|
| 160 |
|
|
|
| 161 |
|
|
return(fddi->hdr.llc_snap.ethertype);
|
| 162 |
|
|
}
|
