在 wireless.wiki.kernel.org 中翻到有这么一页提到了这个选项，瞬间来了兴致想尝试下

https://wireless.wiki.kernel.org/en/developers/regulatory/crda

c++新手好多看不懂。。。。。。（被人忽悠了没学 C 直接 C++有些吃力....）

下面是 linux 源码中的 /net/wireless/reg.c (

个人感觉是 reg.c 中 449 行

#ifdef CONFIG_CFG80211_INTERNAL_REGDB
struct reg_regdb_search_request {
char alpha2[2]; <<改这里的国家码
struct list_head list;
};

)

https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/tree/net/wireless/reg.c?id=refs/tags/v3.18.20

google 几乎全是一样的结果
this is just c code.
u should check
module_param (ieee80211_regdom, charp, 0444 );
MODULE_PARM_DESC (ieee80211_regdom, "IEEE 802.11 regulatory domain code");
this is the where be setted.