1. workshop@NAHA Vol3

2. ✤ linux kernel
✤
✤ linux
✤ Etnernet
✤ Wireless Access

3. linux kernel
TTY
FS
IF
CPU memory DISC CD NIC

4. linux kernel
✤
✤ •
✤
✤
malloc free
✤
✤
✤
✤
✤
✤

5. ✤ kernel
✤ malloc free → kmalloc kfree
✤
✤ PC
✤
✤ tty
✤ open write read
✤ NIC kernel
✤
✤ kernel

6. kernel
static int flag = 0; ✤ func_a() func_b() func_c() kernel
int func_a(void) { ✤ func_b()
int ret = 0;
if (flag) { ✤ func_b()
ret = 1;
} ✤ func_a()
if (flag) {
ret = 2;
}
return ret;
}
void func_b(void) {
flag = 1;
}
void func_c(void) {
flag = 0;
}

7. USB
✤
✤
✤
✤
✤
✤
✤
✤ linux

8. USB
tty net_dev storage
USB
USB
USB

9. USB
✤ init exit
✤
✤ probe disconnect
✤ probe disconnect
✤ USB
✤ PID•VID USB device class
✤ kernel
✤ USB
✤ tty NIC etc
✤ control interrupt bulk

10. USB
insmod
kernel
usb
probe
disconnect
usb
USB
rmmod

11. kernel
✤ NIC
✤ ARP IP

12. linux
✤
✤
✤ •
✤
✤
✤
✤
✤
✤
✤

13. probe
•xmit_func()
•MTU
•timeout
•etc
xmit_func()
•
•
xmit_func()

14. netif_receive_skb()
netif_rx()
Ethernet IP

15. PING linux
✤ ping linux
✤ ping -i 0.5 -s 1500
✤

16. Ethernet Wireless Access
✤ Wireless Access
✤ WiFi Wimax LTE XGP
✤
✤ Ethernet
✤ Wireless Access
✤
✤ Ethernet TCP
✤ Wireless Access MAC
✤
✤ Wireless Access
✤

17. Ethernet
probe() xmit()
net_dev
xmit() or netif_rx()

18. Wireless Access
probe() xmit()
net_dev
netif_rx()
xmit() or