在内核空间中将__be32 ip地址更改为char的方法

Question

我正在制作一个模块，我需要将地址的 __be 32 格式更改为 char，我可以使用哪个函数以及它来自哪个头文件（我知道将 char 转换为 __be32 我们使用 in_aton）。

Answer 1

For kernels older than 2.6.26(if not mistaken) you need to use the NIPQUAD macro, like:

pritk("%d.%d.%d.%d\n", NIPQUAD(your_b32_address));

For newer kernels a switch to printk was added:

printk("%pI4\n", your_b32_address);

Have a look here: http://www.kernel.org/doc/htmldocs/kernel-hacking/common-routines.html

Answer 2

I would like to clarify that if you have

__be32 ipaddr;

you must pass the address of 'ipaddr' to printk

printk("%pI4\n", &ipaddr);