[GitHub]一个简单的网络驱动

GitHub地址：https://github.com/gautamanshul/Network-driver

项目中的Makefile可能有一定的问题，我重写了一下，并在下面给出network.c和makefile文件；

network.c

#include <linux/module.h>
#include <linux/netdevice.h>
#include <linux/etherdevice.h>
#include <linux/ip.h>
#include <linux/skbuff.h>#define RX_INTR 0x0001
#define TX_INTR 0X0002struct net_device *net0,*net1;struct os_packet {struct net_device *dev;int datalen;u8 data[ETH_DATA_LEN];
};struct os_priv { struct net_device_stats stats;int status;struct os_packet *pkt;int rx_int_enabled;int tx_packetlen;u8 *tx_packetdata;struct skbuff *skb;spinlock_t lock;struct net_device *dev;
};int os_open(struct net_device *dev) { return 0; }
int os_stop(struct net_device *dev) { return 0; }
static void os_interrupt(int irq, void *dev_id, struct pt_regs *regs) { }
static void os_hw_tx(char *buf, int len, struct net_device *dev) { }
int os_start_xmit(struct sk_buff *skb, struct net_device *dev) {return 0;
}struct net_device_stats *os_stats(struct net_device *dev) {return &(((struct os_priv *)netdev_priv(dev))->stats);
} int os_header(struct sk_buff *skb, struct net_device *dev, unsigned short type, const void *daddr, const void *saddr, unsigned int len) {return 0;
}static const struct header_ops os_header_ops = {.create = os_header,
};static const struct net_device_ops os_device_ops = {.ndo_open = os_open,.ndo_stop = os_stop,.ndo_start_xmit = os_start_xmit,.ndo_get_stats = os_stats,
};int os_init_mod(void) {struct os_priv *priv;int i;/*net0 and net1 point to net_device structs. Bypassing the PCI as we don't have a real device*/net0 = alloc_etherdev(sizeof(struct os_priv));net1 = alloc_etherdev(sizeof(struct os_priv));for(i = 0; i < 6; i++) net0->dev_addr[i] = (unsigned char)i;for(i = 0; i < 6; i++) net0->broadcast[i] = (unsigned char)15;net0->hard_header_len = 14;for(i = 0; i < 6; i++) net1->dev_addr[i] = (unsigned char)i;for(i = 0; i < 6; i++) net1->broadcast[i] = (unsigned char)15;net1->hard_header_len = 14;net1->dev_addr[5]++;memcpy(net0->name, "net0\0", 5); memcpy(net0->name, "net1\0", 5);net0->netdev_ops = &os_device_ops;net0->header_ops = &os_header_ops;net1->netdev_ops = &os_device_ops;net1->header_ops = &os_header_ops;net0->flags |= IFF_NOARP;net1->flags |= IFF_NOARP;priv = netdev_priv(net0);memset(priv, 0, sizeof(struct os_priv));priv->dev = net0;priv->rx_int_enabled = 1;priv->pkt = kmalloc(sizeof(struct os_packet), GFP_KERNEL);priv->pkt->dev = net0;priv = netdev_priv(net1);memset(priv, 0, sizeof(struct os_priv));priv->dev = net1;priv->rx_int_enabled = 1;priv->pkt = kmalloc(sizeof(struct os_packet), GFP_KERNEL);priv->pkt->dev = net1;if(register_netdev(net0)) {printk(KERN_INFO "net0 not registered\n");} else {printk(KERN_INFO "net0 registered\n");}if(register_netdev(net1)) {printk(KERN_INFO "net1 not registered\n");} else {printk(KERN_INFO "net1 registered\n");}return 0;
}void os_exit_mod(void)
{struct os_priv *priv;if(net0) {priv = netdev_priv(net0);kfree(priv->pkt);unregister_netdev(net0);}if(net1) {priv = netdev_priv(net1);kfree(priv->pkt);unregister_netdev(net1);}
}MODULE_LICENSE("GPL");
module_init(os_init_mod);
module_exit(os_exit_mod);

makefile

ifneq ($(KERNELRELEASE),)
MODULE_NAME = networkmodule
$(MODULE_NAME)-objs := network.o
obj-m := $(MODULE_NAME).o
else
KERNEL_DIR = /lib/modules/`uname -r`/build
MODULEDIR := $(shell pwd).PHONY: modules
default: modulesmodules:make -C $(KERNEL_DIR) M=$(MODULEDIR) modulesclean distclean:rm -f *.o *.mod.c .*.*.cmd *.korm -rf .tmp_versions
endif

结构体net_device_ops

$ pwd
/usr/src/kernels/3.10.0-693.el7.x86_64/include/linux
$ grep net_device_ops netdevice.h --color=auto -n
830: * It is an extension of net_device_ops. Drivers that want to use any of the
831: * fields defined here must initialize net_device_ops->ndo_size to
832: * sizeof(struct net_device_ops).
890:struct net_device_ops_extended {
1197:struct net_device_ops {
1407:    * net_device_ops_extended. The reserved slots above can be used
1410:    * net_device_ops, if they allocated the net_device_ops structure
1412:    * using others' net_device_ops must access the extended fields
1415:   RH_KABI_EXTEND(struct net_device_ops_extended extended)
1419:   const struct net_device_ops *__ops = (ops);            \
1420:   size_t __off = offsetof(struct net_device_ops, extended.field);    \
1612:   const struct net_device_ops *netdev_ops;
3979:static inline netdev_tx_t __netdev_start_xmit(const struct net_device_ops *ops,
3990:   const struct net_device_ops *ops = dev->netdev_ops;

结构体header_ops

./netdevice.h:276:struct header_ops {
./netdevice.h:1616: const struct header_ops *header_ops;
./netdevice.h:2735: if (!dev->header_ops || !dev->header_ops->create)
./netdevice.h:2738: return dev->header_ops->create(skb, dev, type, daddr, saddr, len);
./netdevice.h:2746: if (!dev->header_ops || !dev->header_ops->parse)
./netdevice.h:2748: return dev->header_ops->parse(skb, haddr);
./netdevice.h:2755: if (!dev->header_ops || !dev->header_ops->rebuild)
./netdevice.h:2757: return dev->header_ops->rebuild(skb);

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[GitHub]一个简单的网络驱动

network.c

makefile

结构体net_device_ops

结构体header_ops

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