i have written a driver which sends a ping packet but its not working (i checked using tcpdump -i wlan0 icmp) . basically i have used ioctl call from an user program to start the transmission(its working)but there some problem in module code ,following is my code for transmission:

case WLAN_TRANSMIT :
icmp.type = ICMP_ECHO;
icmp.code = 0;
icmp.un.echo.sequence = i++;
icmp.un.echo.id = current->pid & 0xFFFF;
printk(KERN_ALERT"ID::%X\n",icmp.un.echo.id);
ip4.protocol = 0x01; //for icmp protocol
ip4.tos = 0x00;
ip4.frag_off = 0;
ip4.daddr = in_aton(procfs_buffer);
ip4.saddr = in_aton(ifr->ifr_addr.sa_data);
len = sizeof(data);
skb = dev_alloc_skb(1500);
skb->dev = __dev_get_by_name(&init_net,"wlan0");
skb_reserve(skb,NET_IP_ALIGN); //header of 2 bytes; increments tail and data pointer
skb->data = skb_put(skb,sizeof(len)); // increments all pointer or adds data
memcpy(data,skb->data,len);
wdev = skb->dev;
skb->transport_header =skb_push(skb,sizeof(icmp));
memset(skb->transport_header,0,sizeof(struct icmphdr));
memcpy(skb->transport_header,&icmp,sizeof(struct icmphdr));

skb->network_header=skb_push(skb,sizeof(ip4));
memset(skb->network_header,0,sizeof(struct iphdr));
memcpy(skb->network_header,&ip4,sizeof(struct iphdr));
// printk("i::%d\n",i);
// skb->mac_header = skb_push(skb,6*sizeof(0xFF));
//skb->mac_header = ()
skb->mac_header = skb->dev->dev_addr;
if(dev_queue_xmit(skb)==NET_XMIT_SUCCESS)
printk(KERN_ALERT"success");

i am using dev_queue_xmit .

regards

karan