Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 308 insertions, 0 deletions

diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c
new file mode 100644
index 00000000000..16c4234cbe1
--- /dev/null
+++ b/net/ethernet/eth.c
@@ -0,0 +1,308 @@
+/*
+ * 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.
+ *
+ *              Ethernet-type device handling.
+ *
+ * Version:     @(#)eth.c       1.0.7   05/25/93
+ *
+ * Authors:     Ross Biro, <bir7@leland.Stanford.Edu>
+ *              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>
+ * 
+ * Fixes:
+ *              Mr Linux        : Arp problems
+ *              Alan Cox        : Generic queue tidyup (very tiny here)
+ *              Alan Cox        : eth_header ntohs should be htons
+ *              Alan Cox        : eth_rebuild_header missing an htons and
+ *                                minor other things.
+ *              Tegge           : Arp bug fixes. 
+ *              Florian         : Removed many unnecessary functions, code cleanup
+ *                                and changes for new arp and skbuff.
+ *              Alan Cox        : Redid header building to reflect new format.
+ *              Alan Cox        : ARP only when compiled with CONFIG_INET
+ *              Greg Page       : 802.2 and SNAP stuff.
+ *              Alan Cox        : MAC layer pointers/new format.
+ *              Paul Gortmaker  : eth_copy_and_sum shouldn't csum padding.
+ *              Alan Cox        : Protect against forwarding explosions with
+ *                                older network drivers and IFF_ALLMULTI.
+ *      Christer Weinigel       : Better rebuild header message.
+ *             Andrew Morton    : 26Feb01: kill ether_setup() - use netdev_boot_setup().
+ *
+ *              This program is free software; you can redistribute it and/or
+ *              modify it under the terms of the GNU General Public License
+ *              as published by the Free Software Foundation; either version
+ *              2 of the License, or (at your option) any later version.
+ */
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/sched.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/inet.h>
+#include <linux/ip.h>
+#include <linux/netdevice.h>
+#include <linux/etherdevice.h>
+#include <linux/skbuff.h>
+#include <linux/errno.h>
+#include <linux/config.h>
+#include <linux/init.h>
+#include <net/dst.h>
+#include <net/arp.h>
+#include <net/sock.h>
+#include <net/ipv6.h>
+#include <net/ip.h>
+#include <asm/uaccess.h>
+#include <asm/system.h>
+#include <asm/checksum.h>
+
+extern int __init netdev_boot_setup(char *str);
+
+__setup("ether=", netdev_boot_setup);
+
+/*
+ *       Create the Ethernet MAC header for an arbitrary protocol layer 
+ *
+ *      saddr=NULL      means use device source address
+ *      daddr=NULL      means leave destination address (eg unresolved arp)
+ */
+
+int eth_header(struct sk_buff *skb, struct net_device *dev, unsigned short type,
+           void *daddr, void *saddr, unsigned len)
+{
+        struct ethhdr *eth = (struct ethhdr *)skb_push(skb,ETH_HLEN);
+
+        /* 
+         *      Set the protocol type. For a packet of type ETH_P_802_3 we put the length
+         *      in here instead. It is up to the 802.2 layer to carry protocol information.
+         */
+        
+        if(type!=ETH_P_802_3) 
+                eth->h_proto = htons(type);
+        else
+                eth->h_proto = htons(len);
+
+        /*
+         *      Set the source hardware address. 
+         */
+         
+        if(saddr)
+                memcpy(eth->h_source,saddr,dev->addr_len);
+        else
+                memcpy(eth->h_source,dev->dev_addr,dev->addr_len);
+
+        /*
+         *      Anyway, the loopback-device should never use this function... 
+         */
+
+        if (dev->flags & (IFF_LOOPBACK|IFF_NOARP)) 
+        {
+                memset(eth->h_dest, 0, dev->addr_len);
+                return ETH_HLEN;
+        }
+        
+        if(daddr)
+        {
+                memcpy(eth->h_dest,daddr,dev->addr_len);
+                return ETH_HLEN;
+        }
+        
+        return -ETH_HLEN;
+}
+
+
+/*
+ *      Rebuild the Ethernet MAC header. This is called after an ARP
+ *      (or in future other address resolution) has completed on this
+ *      sk_buff. We now let ARP fill in the other fields.
+ *
+ *      This routine CANNOT use cached dst->neigh!
+ *      Really, it is used only when dst->neigh is wrong.
+ */
+
+int eth_rebuild_header(struct sk_buff *skb)
+{
+        struct ethhdr *eth = (struct ethhdr *)skb->data;
+        struct net_device *dev = skb->dev;
+
+        switch (eth->h_proto)
+        {
+#ifdef CONFIG_INET
+        case __constant_htons(ETH_P_IP):
+                return arp_find(eth->h_dest, skb);
+#endif  
+        default:
+                printk(KERN_DEBUG
+                       "%s: unable to resolve type %X addresses.\n", 
+                       dev->name, (int)eth->h_proto);
+                
+                memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
+                break;
+        }
+
+        return 0;
+}
+
+
+/*
+ *      Determine the packet's protocol ID. The rule here is that we 
+ *      assume 802.3 if the type field is short enough to be a length.
+ *      This is normal practice and works for any 'now in use' protocol.
+ */
+ 
+unsigned short eth_type_trans(struct sk_buff *skb, struct net_device *dev)
+{
+        struct ethhdr *eth;
+        unsigned char *rawp;
+        
+        skb->mac.raw=skb->data;
+        skb_pull(skb,ETH_HLEN);
+        eth = eth_hdr(skb);
+        skb->input_dev = dev;
+        
+        if(*eth->h_dest&1)
+        {
+                if(memcmp(eth->h_dest,dev->broadcast, ETH_ALEN)==0)
+                        skb->pkt_type=PACKET_BROADCAST;
+                else
+                        skb->pkt_type=PACKET_MULTICAST;
+        }
+        
+        /*
+         *      This ALLMULTI check should be redundant by 1.4
+         *      so don't forget to remove it.
+         *
+         *      Seems, you forgot to remove it. All silly devices
+         *      seems to set IFF_PROMISC.
+         */
+         
+        else if(1 /*dev->flags&IFF_PROMISC*/)
+        {
+                if(memcmp(eth->h_dest,dev->dev_addr, ETH_ALEN))
+                        skb->pkt_type=PACKET_OTHERHOST;
+        }
+        
+        if (ntohs(eth->h_proto) >= 1536)
+                return eth->h_proto;
+                
+        rawp = skb->data;
+        
+        /*
+         *      This is a magic hack to spot IPX packets. Older Novell breaks
+         *      the protocol design and runs IPX over 802.3 without an 802.2 LLC
+         *      layer. We look for FFFF which isn't a used 802.2 SSAP/DSAP. This
+         *      won't work for fault tolerant netware but does for the rest.
+         */
+        if (*(unsigned short *)rawp == 0xFFFF)
+                return htons(ETH_P_802_3);
+                
+        /*
+         *      Real 802.2 LLC
+         */
+        return htons(ETH_P_802_2);
+}
+
+static int eth_header_parse(struct sk_buff *skb, unsigned char *haddr)
+{
+        struct ethhdr *eth = eth_hdr(skb);
+        memcpy(haddr, eth->h_source, ETH_ALEN);
+        return ETH_ALEN;
+}
+
+int eth_header_cache(struct neighbour *neigh, struct hh_cache *hh)
+{
+        unsigned short type = hh->hh_type;
+        struct ethhdr *eth;
+        struct net_device *dev = neigh->dev;
+
+        eth = (struct ethhdr*)
+                (((u8*)hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
+
+        if (type == __constant_htons(ETH_P_802_3))
+                return -1;
+
+        eth->h_proto = type;
+        memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
+        memcpy(eth->h_dest, neigh->ha, dev->addr_len);
+        hh->hh_len = ETH_HLEN;
+        return 0;
+}
+
+/*
+ * Called by Address Resolution module to notify changes in address.
+ */
+
+void eth_header_cache_update(struct hh_cache *hh, struct net_device *dev, unsigned char * haddr)
+{
+        memcpy(((u8*)hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
+               haddr, dev->addr_len);
+}
+
+EXPORT_SYMBOL(eth_type_trans);
+
+static int eth_mac_addr(struct net_device *dev, void *p)
+{
+        struct sockaddr *addr=p;
+        if (netif_running(dev))
+                return -EBUSY;
+        memcpy(dev->dev_addr, addr->sa_data,dev->addr_len);
+        return 0;
+}
+
+static int eth_change_mtu(struct net_device *dev, int new_mtu)
+{
+        if ((new_mtu < 68) || (new_mtu > 1500))
+                return -EINVAL;
+        dev->mtu = new_mtu;
+        return 0;
+}
+
+/*
+ * Fill in the fields of the device structure with ethernet-generic values.
+ */
+void ether_setup(struct net_device *dev)
+{
+        dev->change_mtu         = eth_change_mtu;
+        dev->hard_header        = eth_header;
+        dev->rebuild_header     = eth_rebuild_header;
+        dev->set_mac_address    = eth_mac_addr;
+        dev->hard_header_cache  = eth_header_cache;
+        dev->header_cache_update= eth_header_cache_update;
+        dev->hard_header_parse  = eth_header_parse;
+
+        dev->type               = ARPHRD_ETHER;
+        dev->hard_header_len    = ETH_HLEN;
+        dev->mtu                = 1500; /* eth_mtu */
+        dev->addr_len           = ETH_ALEN;
+        dev->tx_queue_len       = 1000; /* Ethernet wants good queues */        
+        dev->flags              = IFF_BROADCAST|IFF_MULTICAST;
+        
+        memset(dev->broadcast,0xFF, ETH_ALEN);
+
+}
+EXPORT_SYMBOL(ether_setup);
+
+/**
+ * alloc_etherdev - Allocates and sets up an ethernet device
+ * @sizeof_priv: Size of additional driver-private structure to be allocated
+ *      for this ethernet device
+ *
+ * Fill in the fields of the device structure with ethernet-generic
+ * values. Basically does everything except registering the device.
+ *
+ * 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_etherdev(int sizeof_priv)
+{
+        return alloc_netdev(sizeof_priv, "eth%d", ether_setup);
+}
+EXPORT_SYMBOL(alloc_etherdev);