396 lines
11 KiB
C
396 lines
11 KiB
C
/*
|
|
* 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
|
|
* 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/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/init.h>
|
|
#include <linux/if_ether.h>
|
|
#include <net/dst.h>
|
|
#include <net/arp.h>
|
|
#include <net/sock.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/ip.h>
|
|
#include <net/dsa.h>
|
|
#include <asm/uaccess.h>
|
|
#include <asm/system.h>
|
|
|
|
__setup("ether=", netdev_boot_setup);
|
|
|
|
/**
|
|
* eth_header - create the Ethernet header
|
|
* @skb: buffer to alter
|
|
* @dev: source device
|
|
* @type: Ethernet type field
|
|
* @daddr: destination address (NULL leave destination address)
|
|
* @saddr: source address (NULL use device source address)
|
|
* @len: packet length (<= skb->len)
|
|
*
|
|
*
|
|
* Set the protocol type. For a packet of type ETH_P_802_3/2 we put the length
|
|
* in here instead.
|
|
*/
|
|
int eth_header(struct sk_buff *skb, struct net_device *dev,
|
|
unsigned short type,
|
|
const void *daddr, const void *saddr, unsigned len)
|
|
{
|
|
struct ethhdr *eth = (struct ethhdr *)skb_push(skb, ETH_HLEN);
|
|
|
|
if (type != ETH_P_802_3 && type != ETH_P_802_2)
|
|
eth->h_proto = htons(type);
|
|
else
|
|
eth->h_proto = htons(len);
|
|
|
|
/*
|
|
* Set the source hardware address.
|
|
*/
|
|
|
|
if (!saddr)
|
|
saddr = dev->dev_addr;
|
|
memcpy(eth->h_source, saddr, ETH_ALEN);
|
|
|
|
if (daddr) {
|
|
memcpy(eth->h_dest, daddr, ETH_ALEN);
|
|
return ETH_HLEN;
|
|
}
|
|
|
|
/*
|
|
* Anyway, the loopback-device should never use this function...
|
|
*/
|
|
|
|
if (dev->flags & (IFF_LOOPBACK | IFF_NOARP)) {
|
|
memset(eth->h_dest, 0, ETH_ALEN);
|
|
return ETH_HLEN;
|
|
}
|
|
|
|
return -ETH_HLEN;
|
|
}
|
|
EXPORT_SYMBOL(eth_header);
|
|
|
|
/**
|
|
* eth_rebuild_header- rebuild the Ethernet MAC header.
|
|
* @skb: socket buffer to update
|
|
*
|
|
* This is called after an ARP or IPV6 ndisc it's resolution on this
|
|
* sk_buff. We now let protocol (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 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, ntohs(eth->h_proto));
|
|
|
|
memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
|
|
break;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(eth_rebuild_header);
|
|
|
|
/**
|
|
* eth_type_trans - determine the packet's protocol ID.
|
|
* @skb: received socket data
|
|
* @dev: receiving network device
|
|
*
|
|
* 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.
|
|
*/
|
|
__be16 eth_type_trans(struct sk_buff *skb, struct net_device *dev)
|
|
{
|
|
struct ethhdr *eth;
|
|
|
|
skb->dev = dev;
|
|
skb_reset_mac_header(skb);
|
|
skb_pull_inline(skb, ETH_HLEN);
|
|
eth = eth_hdr(skb);
|
|
|
|
if (unlikely(is_multicast_ether_addr(eth->h_dest))) {
|
|
if (!compare_ether_addr_64bits(eth->h_dest, dev->broadcast))
|
|
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 (unlikely(compare_ether_addr_64bits(eth->h_dest, dev->dev_addr)))
|
|
skb->pkt_type = PACKET_OTHERHOST;
|
|
}
|
|
|
|
/*
|
|
* Some variants of DSA tagging don't have an ethertype field
|
|
* at all, so we check here whether one of those tagging
|
|
* variants has been configured on the receiving interface,
|
|
* and if so, set skb->protocol without looking at the packet.
|
|
*/
|
|
if (netdev_uses_dsa_tags(dev))
|
|
return htons(ETH_P_DSA);
|
|
if (netdev_uses_trailer_tags(dev))
|
|
return htons(ETH_P_TRAILER);
|
|
|
|
if (ntohs(eth->h_proto) >= 1536)
|
|
return eth->h_proto;
|
|
|
|
/*
|
|
* 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 (skb->len >= 2 && *(unsigned short *)(skb->data) == 0xFFFF)
|
|
return htons(ETH_P_802_3);
|
|
|
|
/*
|
|
* Real 802.2 LLC
|
|
*/
|
|
return htons(ETH_P_802_2);
|
|
}
|
|
EXPORT_SYMBOL(eth_type_trans);
|
|
|
|
/**
|
|
* eth_header_parse - extract hardware address from packet
|
|
* @skb: packet to extract header from
|
|
* @haddr: destination buffer
|
|
*/
|
|
int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr)
|
|
{
|
|
const struct ethhdr *eth = eth_hdr(skb);
|
|
memcpy(haddr, eth->h_source, ETH_ALEN);
|
|
return ETH_ALEN;
|
|
}
|
|
EXPORT_SYMBOL(eth_header_parse);
|
|
|
|
/**
|
|
* eth_header_cache - fill cache entry from neighbour
|
|
* @neigh: source neighbour
|
|
* @hh: destination cache entry
|
|
* @type: Ethernet type field
|
|
* Create an Ethernet header template from the neighbour.
|
|
*/
|
|
int eth_header_cache(const struct neighbour *neigh, struct hh_cache *hh, __be16 type)
|
|
{
|
|
struct ethhdr *eth;
|
|
const struct net_device *dev = neigh->dev;
|
|
|
|
eth = (struct ethhdr *)
|
|
(((u8 *) hh->hh_data) + (HH_DATA_OFF(sizeof(*eth))));
|
|
|
|
if (type == htons(ETH_P_802_3))
|
|
return -1;
|
|
|
|
eth->h_proto = type;
|
|
memcpy(eth->h_source, dev->dev_addr, ETH_ALEN);
|
|
memcpy(eth->h_dest, neigh->ha, ETH_ALEN);
|
|
hh->hh_len = ETH_HLEN;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(eth_header_cache);
|
|
|
|
/**
|
|
* eth_header_cache_update - update cache entry
|
|
* @hh: destination cache entry
|
|
* @dev: network device
|
|
* @haddr: new hardware address
|
|
*
|
|
* Called by Address Resolution module to notify changes in address.
|
|
*/
|
|
void eth_header_cache_update(struct hh_cache *hh,
|
|
const struct net_device *dev,
|
|
const unsigned char *haddr)
|
|
{
|
|
memcpy(((u8 *) hh->hh_data) + HH_DATA_OFF(sizeof(struct ethhdr)),
|
|
haddr, ETH_ALEN);
|
|
}
|
|
EXPORT_SYMBOL(eth_header_cache_update);
|
|
|
|
/**
|
|
* eth_mac_addr - set new Ethernet hardware address
|
|
* @dev: network device
|
|
* @p: socket address
|
|
* Change hardware address of device.
|
|
*
|
|
* This doesn't change hardware matching, so needs to be overridden
|
|
* for most real devices.
|
|
*/
|
|
int eth_mac_addr(struct net_device *dev, void *p)
|
|
{
|
|
struct sockaddr *addr = p;
|
|
|
|
if (netif_running(dev))
|
|
return -EBUSY;
|
|
if (!is_valid_ether_addr(addr->sa_data))
|
|
return -EADDRNOTAVAIL;
|
|
memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN);
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(eth_mac_addr);
|
|
|
|
/**
|
|
* eth_change_mtu - set new MTU size
|
|
* @dev: network device
|
|
* @new_mtu: new Maximum Transfer Unit
|
|
*
|
|
* Allow changing MTU size. Needs to be overridden for devices
|
|
* supporting jumbo frames.
|
|
*/
|
|
int eth_change_mtu(struct net_device *dev, int new_mtu)
|
|
{
|
|
if (new_mtu < 68 || new_mtu > ETH_DATA_LEN)
|
|
return -EINVAL;
|
|
dev->mtu = new_mtu;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(eth_change_mtu);
|
|
|
|
int eth_validate_addr(struct net_device *dev)
|
|
{
|
|
if (!is_valid_ether_addr(dev->dev_addr))
|
|
return -EADDRNOTAVAIL;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(eth_validate_addr);
|
|
|
|
const struct header_ops eth_header_ops ____cacheline_aligned = {
|
|
.create = eth_header,
|
|
.parse = eth_header_parse,
|
|
.rebuild = eth_rebuild_header,
|
|
.cache = eth_header_cache,
|
|
.cache_update = eth_header_cache_update,
|
|
};
|
|
|
|
/**
|
|
* ether_setup - setup Ethernet network device
|
|
* @dev: network device
|
|
* Fill in the fields of the device structure with Ethernet-generic values.
|
|
*/
|
|
void ether_setup(struct net_device *dev)
|
|
{
|
|
dev->header_ops = ð_header_ops;
|
|
dev->type = ARPHRD_ETHER;
|
|
dev->hard_header_len = ETH_HLEN;
|
|
dev->mtu = ETH_DATA_LEN;
|
|
dev->addr_len = ETH_ALEN;
|
|
dev->tx_queue_len = 1000; /* Ethernet wants good queues */
|
|
dev->flags = IFF_BROADCAST|IFF_MULTICAST;
|
|
dev->priv_flags = IFF_TX_SKB_SHARING;
|
|
|
|
memset(dev->broadcast, 0xFF, ETH_ALEN);
|
|
|
|
}
|
|
EXPORT_SYMBOL(ether_setup);
|
|
|
|
/**
|
|
* alloc_etherdev_mqs - Allocates and sets up an Ethernet device
|
|
* @sizeof_priv: Size of additional driver-private structure to be allocated
|
|
* for this Ethernet device
|
|
* @txqs: The number of TX queues this device has.
|
|
* @rxqs: The number of RX queues this device has.
|
|
*
|
|
* 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_mqs(int sizeof_priv, unsigned int txqs,
|
|
unsigned int rxqs)
|
|
{
|
|
return alloc_netdev_mqs(sizeof_priv, "eth%d", ether_setup, txqs, rxqs);
|
|
}
|
|
EXPORT_SYMBOL(alloc_etherdev_mqs);
|
|
|
|
static size_t _format_mac_addr(char *buf, int buflen,
|
|
const unsigned char *addr, int len)
|
|
{
|
|
int i;
|
|
char *cp = buf;
|
|
|
|
for (i = 0; i < len; i++) {
|
|
cp += scnprintf(cp, buflen - (cp - buf), "%02x", addr[i]);
|
|
if (i == len - 1)
|
|
break;
|
|
cp += scnprintf(cp, buflen - (cp - buf), ":");
|
|
}
|
|
return cp - buf;
|
|
}
|
|
|
|
ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len)
|
|
{
|
|
size_t l;
|
|
|
|
l = _format_mac_addr(buf, PAGE_SIZE, addr, len);
|
|
l += scnprintf(buf + l, PAGE_SIZE - l, "\n");
|
|
return (ssize_t)l;
|
|
}
|
|
EXPORT_SYMBOL(sysfs_format_mac);
|