實驗二 Linux 下網路驅動程式追蹤

1. 實驗二Linux下網路驅動程式追蹤 教師： 助教： 1998/10/19 High Speed Network Lab. Department of Computer Information Science, NCTU

2. Outline • Why Linux ? • Linux核心的內部 • Linux開機始末 • 實驗步驟

3. Why Linux ? • Free !! • Compatible with System V & BSD UNIX • Compliant to POSIX 1.0 • Fast update !! • Internet • Powerful !! • Pure 32-bit OS • Candidate OS for embedded system • Source code open !! • Suitable for academic use

4. Linux 核心內部

5. Linux 開機始末 • Load the kernel • Probe & setup the hardware • Create system process • System initialization • getty • login process

6. 實驗步驟 • 安裝 Linux • 追蹤開機始末 • 編譯核心 • 設定Linux網路組態 • 在kernel中追蹤 network driver

7. 安裝 Linux • Where should I install it from ? • Which distribution should I choose from ? • Which version should I take ? • How do I install it ? • Does there exist any document ? • /usr/doc

8. 追蹤Linux開機始末 • Capture bootup sequence • dmesg • Shift + [PgUp | PgDw] • syslogd • Traverse /etc/initab • /etc/rc.d/ • Tools • grep • Microsoft Visio Studio - Edit - Find in files

9. 編譯核心 • FTP, tar • make [config | menuconfig | xconfig] • Modules support • Choose your adapter driver • Choose TCP/IP protocol stack • make dep, make clean, make zImage • make modules, make modules_install • move to /boot • re-write boot sector (lilo -v -v -v)

10. 設定網路組態 • Internet 參數 • Network Interface Configuration • ifconfig eth0 x.x.x.x netmask y.y.y.y broadcast z.z.z.z • Routing table Configuration • route add -net default gw 140.113.88.254 dev eth0 • route add -net 140.113.23.0 dev eth0

11. 追蹤kernel中的network driver • Trace by debugger • Trace by printing, record by logging • klogd vs. syslogd • Trigger network modules by “ping”

12. 決定待測機器 • Host IP= H, Netmask=M, Router=R • far active host (IP address=F) • near active host (IP address=N1) • near inactive host (IP address=N2) （H and M）＝（R and M）＝（R and N1）＝（R and N2）≠（R and F）