ifconfig
adb shell後用以下指令可以看到目前板子上的網路裝置
# busybox-armv6l ifconfig -a
busybox可自行上網下載執行檔
ifconfig 運作方式
追busybox的code可以找到這段程式
// file: busybox-1.18.4/networking/interface.c
#define _PATH_PROCNET_DEV "/proc/net/dev"
static int if_readlist_proc(char *target)
{
static smallint proc_read;
FILE *fh;
char buf[512];
struct interface *ife;
int err, procnetdev_vsn;
if (proc_read)
return 0;
if (!target)
proc_read = 1;
fh = fopen_or_warn(_PATH_PROCNET_DEV, "r");
if (!fh) {
return if_readconf();
}
可以看到它open了一個檔案_PATH_PROCNET_DEV，這個檔案為"/proc/net/dev"，所以得知ifconfig是從那裡抓network devices name
driver
秀出/proc/net/dev訊息
至於driver如何將這些資訊秀出可以參考 dev_seq_show() 如下
// file: kernel/net/core/dev.c
static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
struct rtnl_link_stats64 temp;
const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
"%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
dev->name, stats->rx_bytes, stats->rx_packets,
stats->rx_errors,
stats->rx_dropped + stats->rx_missed_errors,
stats->rx_fifo_errors,
stats->rx_length_errors + stats->rx_over_errors +
stats->rx_crc_errors + stats->rx_frame_errors,
stats->rx_compressed, stats->multicast,
stats->tx_bytes, stats->tx_packets,
stats->tx_errors, stats->tx_dropped,
stats->tx_fifo_errors, stats->collisions,
stats->tx_carrier_errors +
stats->tx_aborted_errors +
stats->tx_window_errors +
stats->tx_heartbeat_errors,
stats->tx_compressed);
}
/*
* Called from the PROCfs module. This now uses the new arbitrary sized
* /proc/net interface to create /proc/net/dev
*/
static int dev_seq_show(struct seq_file *seq, void *v)
{
if (v == SEQ_START_TOKEN)
seq_puts(seq, "Inter-| Receive "
" | Transmit\n"
" face |bytes packets errs drop fifo frame "
"compressed multicast|bytes packets errs "
"drop fifo colls carrier compressed\n");
else
dev_seq_printf_stats(seq, v);
return 0;
}
driver註冊network device
driver要跟kernel註冊自己是個network device，註冊時最底層是用到 list_netdevice
// file: kernel/net/core/dev.c
/* Device list insertion */
static int list_netdevice(struct net_device *dev)
{
struct net *net = dev_net(dev);
ASSERT_RTNL();
write_lock_bh(&dev_base_lock);
list_add_tail_rcu(&dev->dev_list, &net->dev_base_head);
hlist_add_head_rcu(&dev->name_hlist, dev_name_hash(net, dev->name));
hlist_add_head_rcu(&dev->index_hlist,
dev_index_hash(net, dev->ifindex));
write_unlock_bh(&dev_base_lock);
return 0;
}
最外層是用
// file: kernel/drivers/net/usb/usbnet.c
int
usbnet_probe (struct usb_interface *udev, const struct usb_device_id *prod)
{
status = register_netdev (net);
usbnet_probe又是誰呼叫了，我們就是我們要用的LAN chip SMSC95XX用到了
// file: kernel/drivers/net/usb/smsc95xx.c
static struct usb_driver smsc95xx_driver = {
.name = "smsc95xx",
.id_table = products,
.probe = usbnet_probe,
.suspend = usbnet_suspend,
.resume = usbnet_resume,
.disconnect = usbnet_disconnect,
};
SMSC9514
# $ adb shell # lsusb 1d6b:0002 (bus 1, device 1) 1d6b:0002 (bus 2, device 1) # # 插入裝置 # lsusb 1d6b:0002 (bus 1, device 1) 1d6b:0002 (bus 2, device 1) 0424:9514 (bus 1, device 2) 0424:ec00 (bus 1, device 3) # busybox-armv6l ash / # # 設IP跟DNS / # busybox-armv6l ifconfig eth0 192.168.1.123 / # busybox-armv6l route add default gw 192.168.1.1 / # ping 168.95.1.1 PING 168.95.1.1 (168.95.1.1) 56(84) bytes of data. 64 bytes from 168.95.1.1: icmp_seq=1 ttl=242 time=670 ms 64 bytes from 168.95.1.1: icmp_seq=2 ttl=242 time=989 ms 64 bytes from 168.95.1.1: icmp_seq=3 ttl=242 time=589 ms #setprop net.dns1 168.95.1.1
UI
這部分比較麻煩，可以自行參考android-x86的實作。
圖：PM在講相簿新增的功能
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