虚拟网卡驱动snull中的MAC地址问题！！！
在http://www.cs.fsu.edu/找的snull.c想做一个虚拟网卡。然后做成内核模块的方式。内核版本是2.6.27.5这个是源码：
snull.c
#include <linux/module.h>
#include <linux/init.h>
#include <linux/moduleparam.h>
#include <linux/sched.h>
#include <linux/kernel.h> /* printk() */
#include <linux/slab.h> /* kmalloc() */
#include <linux/errno.h>/* error codes */
#include <linux/types.h>/* size_t */
#include <linux/interrupt.h> /* mark_bh */
#include <linux/in.h>
#include <linux/netdevice.h> /* struct device, and other headers */
#include <linux/etherdevice.h> /* eth_type_trans */
#include <linux/ip.h> /* struct iphdr */
#include <linux/tcp.h> /* struct tcphdr */
#include <linux/skbuff.h>
#include "snull.h"
#include <linux/in6.h>
#include <asm/checksum.h>
MODULE_AUTHOR("Alessandro Rubini, Jonathan Corbet");
MODULE_LICENSE("Dual BSD/GPL");
static int lockup = 0;
module_param(lockup, int, 0);
//static int timeout = SNULL_TIMEOUT;
static int timeout = 10;
module_param(timeout, int, 0);
static int use_napi = 0;
module_param(use_napi, int, 0);
struct net_device *snull_devs;
struct snull_packet {
struct snull_packet *next;
struct net_device *dev;
int datalen;
u8 data;
};
int pool_size = 8;
module_param(pool_size, int, 0);
struct snull_priv {
struct net_device_stats stats;
int status;
struct snull_packet *ppool;
struct snull_packet *rx_queue;/* List of incoming packets */
int rx_int_enabled;
int tx_packetlen;
u8 *tx_packetdata;
struct sk_buff *skb;
spinlock_t lock;
struct net_device *dev;
struct napi_struct napi;
};
static void snull_tx_timeout(struct net_device *dev);
static void (*snull_interrupt)(int, void *, struct pt_regs *);
void snull_setup_pool(struct net_device *dev)
{
struct snull_priv *priv = netdev_priv(dev);
int i;
struct snull_packet *pkt;
priv->ppool = NULL;
for (i = 0; i < pool_size; i++) {
pkt = kmalloc (sizeof (struct snull_packet), GFP_KERNEL);
if (pkt == NULL) {
printk (KERN_NOTICE "Ran out of memory allocating packet pool\n");
return;
}
pkt->dev = dev;
pkt->next = priv->ppool;
priv->ppool = pkt;
}
}
void snull_teardown_pool(struct net_device *dev)
{
struct snull_priv *priv = netdev_priv(dev);
struct snull_packet *pkt;
while ((pkt = priv->ppool)) {
priv->ppool = pkt->next;
kfree (pkt);
/* FIXME - in-flight packets ? */
}
}
struct snull_packet *snull_get_tx_buffer(struct net_device *dev)
{
struct snull_priv *priv = netdev_priv(dev);
unsigned long flags;
struct snull_packet *pkt;
spin_lock_irqsave(&priv->lock, flags);
pkt = priv->ppool;
priv->ppool = pkt->next;
if (priv->ppool == NULL) {
printk (KERN_INFO "Pool empty\n");
netif_stop_queue(dev);
}
spin_unlock_irqrestore(&priv->lock, flags);
return pkt;
}
void snull_release_buffer(struct snull_packet *pkt)
{
unsigned long flags;
struct snull_priv *priv = netdev_priv(pkt->dev);
spin_lock_irqsave(&priv->lock, flags);
pkt->next = priv->ppool;
priv->ppool = pkt;
spin_unlock_irqrestore(&priv->lock, flags);
if (netif_queue_stopped(pkt->dev) && pkt->next == NULL)
netif_wake_queue(pkt->dev);
}
void snull_enqueue_buf(struct net_device *dev, struct snull_packet *pkt)
{
unsigned long flags;
struct snull_priv *priv = netdev_priv(dev);
spin_lock_irqsave(&priv->lock, flags);
pkt->next = priv->rx_queue;/* FIXME - misorders packets */
priv->rx_queue = pkt;
spin_unlock_irqrestore(&priv->lock, flags);
}
struct snull_packet *snull_dequeue_buf(struct net_device *dev)
{
struct snull_priv *priv = netdev_priv(dev);
struct snull_packet *pkt;
unsigned long flags;
spin_lock_irqsave(&priv->lock, flags);
pkt = priv->rx_queue;
if (pkt != NULL)
priv->rx_queue = pkt->next;
spin_unlock_irqrestore(&priv->lock, flags);
return pkt;
}
static void snull_rx_ints(struct net_device *dev, int enable)
{
struct snull_priv *priv = netdev_priv(dev);
priv->rx_int_enabled = enable;
}
int snull_open(struct net_device *dev)
{
memcpy(dev->dev_addr, "\0SNUL0", ETH_ALEN);
if (dev == snull_devs)
dev->dev_addr++; /* \0SNUL1 */
netif_start_queue(dev);
return 0;
}
int snull_release(struct net_device *dev)
{
/* release ports, irq and such -- like fops->close */
netif_stop_queue(dev); /* can't transmit any more */
return 0;
}
int snull_set_mac_address(struct net_device *dev,void *p)
{
int i;
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,dev->addr_len);
memcpy(dev->dev_addr, "\0SNUL0", ETH_ALEN);
printk(KERN_ALERT "mac_open2,%s\n",dev->dev_addr);
if (dev == snull_devs)
dev->dev_addr++; /* \0SNUL1 */
return 0;
}
int snull_config(struct net_device *dev, struct ifmap *map)
{
printk(KERN_ALERT "snull_config\n");
if (dev->flags & IFF_UP) /* can't act on a running interface */
return -EBUSY;
/* Don't allow changing the I/O address */
if (map->base_addr != dev->base_addr) {
printk(KERN_WARNING "snull: Can't change I/O address\n");
return -EOPNOTSUPP;
}
/* Allow changing the IRQ */
if (map->irq != dev->irq) {
dev->irq = map->irq;
/* request_irq() is delayed to open-time */
}
/* ignore other fields */
return 0;
}
void snull_rx(struct net_device *dev, struct snull_packet *pkt)
{
struct sk_buff *skb;
struct snull_priv *priv = netdev_priv(dev);
skb = dev_alloc_skb(pkt->datalen + 2);
if (!skb) {
if (printk_ratelimit())
printk(KERN_NOTICE "snull rx: low on mem - packet dropped\n");
priv->stats.rx_dropped++;
goto out;
}
skb_reserve(skb, 2); /* align IP on 16B boundary */
memcpy(skb_put(skb, pkt->datalen), pkt->data, pkt->datalen);
/* Write metadata, and then pass to the receive level */
skb->dev = dev;
skb->protocol = eth_type_trans(skb, dev);
skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
priv->stats.rx_packets++;
priv->stats.rx_bytes += pkt->datalen;
netif_rx(skb);
out:
return;
}
/*
* The poll implementation.
*/
static int snull_poll(struct napi_struct *napi, int budget)
{
int npackets = 0;
struct sk_buff *skb;
struct snull_priv*priv = container_of(napi, struct snull_priv, napi);
struct net_device*dev =priv->dev;
struct snull_packet *pkt;
while (npackets < budget && priv->rx_queue) {
pkt = snull_dequeue_buf(dev);
skb = dev_alloc_skb(pkt->datalen + 2);
if (! skb) {
if (printk_ratelimit())
printk(KERN_NOTICE "snull: packet dropped\n");
priv->stats.rx_dropped++;
snull_release_buffer(pkt);
continue;
}
skb_reserve(skb, 2); /* align IP on 16B boundary */
memcpy(skb_put(skb, pkt->datalen), pkt->data, pkt->datalen);
skb->dev = dev;
skb->protocol = eth_type_trans(skb, dev);
skb->ip_summed = CHECKSUM_UNNECESSARY; /* don't check it */
netif_receive_skb(skb);
/* Maintain stats */
npackets++;
priv->stats.rx_packets++;
priv->stats.rx_bytes += pkt->datalen;
snull_release_buffer(pkt);
}
if (npackets < budget) {
napi_complete(napi);
snull_rx_ints(dev, 1);
}
return npackets;
}
static void snull_regular_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
int statusword;
struct snull_priv *priv;
struct snull_packet *pkt = NULL;
struct net_device *dev = (struct net_device *)dev_id;
/* ... and check with hw if it's really ours */
/* paranoid */
if (!dev)
return;
/* Lock the device */
priv = netdev_priv(dev);
spin_lock(&priv->lock);
statusword = priv->status;
priv->status = 0;
if (statusword & SNULL_RX_INTR) {
/* send it to snull_rx for handling */
pkt = priv->rx_queue;
if (pkt) {
priv->rx_queue = pkt->next;
snull_rx(dev, pkt);
}
}
if (statusword & SNULL_TX_INTR) {
/* a transmission is over: free the skb */
priv->stats.tx_packets++;
priv->stats.tx_bytes += priv->tx_packetlen;
dev_kfree_skb(priv->skb);
}
/* Unlock the device and we are done */
spin_unlock(&priv->lock);
if (pkt) snull_release_buffer(pkt); /* Do this outside the lock! */
return;
}
static void snull_napi_interrupt(int irq, void *dev_id, struct pt_regs *regs)
{
int statusword;
struct snull_priv *priv;
struct net_device *dev = (struct net_device *)dev_id;
if (!dev)
return;
/* Lock the device */
priv = netdev_priv(dev);
spin_lock(&priv->lock);
statusword = priv->status;
priv->status = 0;
if (statusword & SNULL_RX_INTR) {
snull_rx_ints(dev, 0);/* Disable further interrupts */
napi_schedule(&priv->napi);
}
if (statusword & SNULL_TX_INTR) {
priv->stats.tx_packets++;
priv->stats.tx_bytes += priv->tx_packetlen;
dev_kfree_skb(priv->skb);
}
spin_unlock(&priv->lock);
return;
}
static void snull_hw_tx(char *buf, int len, struct net_device *dev)
{
struct iphdr *ih;
struct net_device *dest;
struct snull_priv *priv;
u32 *saddr, *daddr;
struct snull_packet *tx_buffer;
/* I am paranoid. Ain't I? */
if (len < sizeof(struct ethhdr) + sizeof(struct iphdr)) {
printk("snull: Hmm... packet too short (%i octets)\n",
len);
return;
}
if (0) { /* enable this conditional to look at the data */
int i;
PDEBUG("len is %i\n" KERN_DEBUG "data:",len);
for (i=14 ; i<len; i++)
printk(" %02x",buf&0xff);
printk("\n");
}
ih = (struct iphdr *)(buf+sizeof(struct ethhdr));
saddr = &ih->saddr;
daddr = &ih->daddr;
((u8 *)saddr) ^= 1; /* change the third octet (class C) */
((u8 *)daddr) ^= 1;
ih->check = 0; /* and rebuild the checksum (ip needs it) */
ih->check = ip_fast_csum((unsigned char *)ih,ih->ihl);
if (dev == snull_devs)
PDEBUGG("%08x:%05i --> %08x:%05i\n",
ntohl(ih->saddr),ntohs(((struct tcphdr *)(ih+1))->source),
ntohl(ih->daddr),ntohs(((struct tcphdr *)(ih+1))->dest));
else
PDEBUGG("%08x:%05i <-- %08x:%05i\n",
ntohl(ih->daddr),ntohs(((struct tcphdr *)(ih+1))->dest),
ntohl(ih->saddr),ntohs(((struct tcphdr *)(ih+1))->source));
dest = snull_devs ? 1 : 0];
priv = netdev_priv(dest);
tx_buffer = snull_get_tx_buffer(dev);
tx_buffer->datalen = len;
memcpy(tx_buffer->data, buf, len);
snull_enqueue_buf(dest, tx_buffer);
if (priv->rx_int_enabled) {
priv->status |= SNULL_RX_INTR;
snull_interrupt(0, dest, NULL);
}
priv = netdev_priv(dev);
priv->tx_packetlen = len;
priv->tx_packetdata = buf;
priv->status |= SNULL_TX_INTR;
if (lockup && ((priv->stats.tx_packets + 1) % lockup) == 0) {
/* Simulate a dropped transmit interrupt */
netif_stop_queue(dev);
PDEBUG("Simulate lockup at %ld, txp %ld\n", jiffies,
(unsigned long) priv->stats.tx_packets);
}
else
snull_interrupt(0, dev, NULL);
}
int snull_tx(struct sk_buff *skb, struct net_device *dev)
{
int len;
char *data, shortpkt;
struct snull_priv *priv = netdev_priv(dev);
data = skb->data;
len = skb->len;
if (len < ETH_ZLEN) {
memset(shortpkt, 0, ETH_ZLEN);
memcpy(shortpkt, skb->data, skb->len);
len = ETH_ZLEN;
data = shortpkt;
}
dev->trans_start = jiffies; /* save the timestamp */
priv->skb = skb;
snull_hw_tx(data, len, dev);
return 0; /* Our simple device can not fail */
}
/*
* Deal with a transmit timeout.
*/
void snull_tx_timeout (struct net_device *dev)
{
struct snull_priv *priv = netdev_priv(dev);
PDEBUG("Transmit timeout at %ld, latency %ld\n", jiffies,
jiffies - dev->trans_start);
/* Simulate a transmission interrupt to get things moving */
priv->status = SNULL_TX_INTR;
snull_interrupt(0, dev, NULL);
priv->stats.tx_errors++;
netif_wake_queue(dev);
return;
}
int snull_ioctl(struct net_device *dev, struct ifreq *rq, int cmd)
{
PDEBUG("ioctl\n");
return 0;
}
struct net_device_stats *snull_stats(struct net_device *dev)
{
struct snull_priv *priv = netdev_priv(dev);
return &priv->stats;
}
int snull_rebuild_header(struct sk_buff *skb)
{
struct ethhdr *eth = (struct ethhdr *) skb->data;
struct net_device *dev = skb->dev;
memcpy(eth->h_source, dev->dev_addr, dev->addr_len);
memcpy(eth->h_dest, dev->dev_addr, dev->addr_len);
eth->h_dest ^= 0x01; /* dest is us xor 1 */
return 0;
}
int snull_header(struct sk_buff *skb, struct net_device *dev,
unsigned short type, const void *daddr, const void *saddr,
unsigned int len)
{
struct ethhdr *eth = (struct ethhdr *)skb_push(skb,ETH_HLEN);
eth->h_proto = htons(type);
memcpy(eth->h_source, saddr ? saddr : dev->dev_addr, dev->addr_len);
memcpy(eth->h_dest, daddr ? daddr : dev->dev_addr, dev->addr_len);
eth->h_dest ^= 0x01; /* dest is us xor 1 */
return (dev->hard_header_len);
}
int snull_change_mtu(struct net_device *dev, int new_mtu)
{
unsigned long flags;
struct snull_priv *priv = netdev_priv(dev);
spinlock_t *lock = &priv->lock;
/* check ranges */
if ((new_mtu < 68) || (new_mtu > 1500))
return -EINVAL;
spin_lock_irqsave(lock, flags);
dev->mtu = new_mtu;
spin_unlock_irqrestore(lock, flags);
return 0; /* success */
}
static const struct header_ops snull_header_ops = {
.create= snull_header,
.rebuild = snull_rebuild_header,
.cache = NULL,/* disable caching */
};
void snull_init(struct net_device *dev)
{
printk(KERN_ALERT "call snull_init\n");
struct snull_priv *priv;
#if 0
#endif
ether_setup(dev); /* assign some of the fields */
dev->open = snull_open,
dev->stop = snull_release,
dev->set_config = snull_config,
dev->hard_start_xmit = snull_tx,
// dev->do_ioctl = snull_ioctl,
dev->get_stats = snull_stats,
dev->change_mtu = snull_change_mtu,
dev->tx_timeout = snull_tx_timeout,
dev->set_mac_address = snull_set_mac_address;
// dev->netdev_ops = &snull_netdev_ops;
dev->header_ops = &snull_header_ops;
dev->watchdog_timeo = timeout;
/* keep the default flags, just add NOARP */
dev->flags |= IFF_NOARP;
dev->features |= NETIF_F_NO_CSUM;
/*
* Then, initialize the priv field. This encloses the statistics
* and a few private fields.
*/
priv = netdev_priv(dev);
memset(priv, 0, sizeof(struct snull_priv));
priv->dev = dev;
netif_napi_add(dev, &priv->napi, snull_poll, 2);
/* The last parameter above is the NAPI "weight". */
spin_lock_init(&priv->lock);
snull_rx_ints(dev, 1); /* enable receive interrupts */
snull_setup_pool(dev);
}
void snull_cleanup(void)
{
int i;
for (i = 0; i < 2;i++) {
if (snull_devs) {
unregister_netdev(snull_devs);
snull_teardown_pool(snull_devs);
free_netdev(snull_devs);
}
}
return;
}
int snull_init_module(void)
{
int result, i, ret = -ENOMEM;
snull_interrupt = use_napi ? snull_napi_interrupt : snull_regular_interrupt;
/* Allocate the devices */
snull_devs = alloc_netdev(sizeof(struct snull_priv), "sn%d",
snull_init);
snull_devs = alloc_netdev(sizeof(struct snull_priv), "sn%d",
snull_init);
if (snull_devs == NULL || snull_devs == NULL)
goto out;
ret = -ENODEV;
for (i = 0; i < 2;i++)
if ((result = register_netdev(snull_devs)))
printk("snull: error %i registering device \"%s\"\n",
result, snull_devs->name);
else
ret = 0;
out:
if (ret)
snull_cleanup();
return ret;
}
module_init(snull_init_module);
module_exit(snull_cleanup);
现在的问题是，每次在insmod snull.ko后，sn0\sn1的MAC地址都是00:00:00:00:00:00
我的理解是用ifconfig sn0 up，会调用snull_open，然后函数里面会给sn0赋值MAC地址。可是这个不行，是我的理解有问题么？
后来发现，需要ifconfig sn0 hw ether 00:12:34:56:78:90这样，sn0才会调用snull_open赋值MAC地址。
请问问题出在哪儿了？各位大侠~~~ 这个是snull.h
#undef PDEBUG /* undef it, just in case */
#ifdef SNULL_DEBUG
#ifdef __KERNEL__
/* This one if debugging is on, and kernel space */
# define PDEBUG(fmt, args...) printk( KERN_DEBUG "snull: " fmt, ## args)
#else
/* This one for user space */
# define PDEBUG(fmt, args...) fprintf(stderr, fmt, ## args)
#endif
#else
#define PDEBUG(fmt, args...) /* not debugging: nothing */
#endif
#undef PDEBUGG
#define PDEBUGG(fmt, args...) /* nothing: it's a placeholder */
#define SNULL_RX_INTR 0x0001
#define SNULL_TX_INTR 0x0002
/* Default timeout period */
#define SNULL_TIMEOUT 5 /* In jiffies */
extern struct net_device *snull_devs[];
http://blog.chinaunix.net/uid-25885064-id-3077098.html可以参考这个博客！
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