net/wireless/reg.c

Source file repositories/reference/linux-study-clean/net/wireless/reg.c

File Facts

System
Linux kernel
Corpus path
net/wireless/reg.c
Extension
.c
Size
116090 bytes
Lines
4389
Domain
Networking Core
Bucket
Sockets, Protocols, Packet Path, And Network Policy
Inferred role
Networking Core: exported/initcall integration point
Status
integration implementation candidate

Why This File Exists

Networking stack implementation surface: socket APIs, protocol dispatch, packet flow, routing, filtering, and network namespaces.

Dependency Surface

Detected Declarations

Annotated Snippet

struct reg_beacon {
	struct list_head list;
	struct ieee80211_channel chan;
};

static void reg_check_chans_work(struct work_struct *work);
static DECLARE_DELAYED_WORK(reg_check_chans, reg_check_chans_work);

static void reg_todo(struct work_struct *work);
static DECLARE_WORK(reg_work, reg_todo);

/* We keep a static world regulatory domain in case of the absence of CRDA */
static const struct ieee80211_regdomain world_regdom = {
	.n_reg_rules = 8,
	.alpha2 =  "00",
	.reg_rules = {
		/* IEEE 802.11b/g, channels 1..11 */
		REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
		/* IEEE 802.11b/g, channels 12..13. */
		REG_RULE(2467-10, 2472+10, 20, 6, 20,
			NL80211_RRF_NO_IR | NL80211_RRF_AUTO_BW),
		/* IEEE 802.11 channel 14 - Only JP enables
		 * this and for 802.11b only */
		REG_RULE(2484-10, 2484+10, 20, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_NO_OFDM),
		/* IEEE 802.11a, channel 36..48 */
		REG_RULE(5180-10, 5240+10, 80, 6, 20,
                        NL80211_RRF_NO_IR |
                        NL80211_RRF_AUTO_BW),

		/* IEEE 802.11a, channel 52..64 - DFS required */
		REG_RULE(5260-10, 5320+10, 80, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_AUTO_BW |
			NL80211_RRF_DFS),

		/* IEEE 802.11a, channel 100..144 - DFS required */
		REG_RULE(5500-10, 5720+10, 160, 6, 20,
			NL80211_RRF_NO_IR |
			NL80211_RRF_DFS),

		/* IEEE 802.11a, channel 149..165 */
		REG_RULE(5745-10, 5825+10, 80, 6, 20,
			NL80211_RRF_NO_IR),

		/* IEEE 802.11ad (60GHz), channels 1..3 */
		REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
	}
};

/* protected by RTNL */
static const struct ieee80211_regdomain *cfg80211_world_regdom =
	&world_regdom;

static char *ieee80211_regdom = "00";
static char user_alpha2[2];
static const struct ieee80211_regdomain *cfg80211_user_regdom;

module_param(ieee80211_regdom, charp, 0444);
MODULE_PARM_DESC(ieee80211_regdom, "IEEE 802.11 regulatory domain code");

static void reg_free_request(struct regulatory_request *request)
{
	if (request == &core_request_world)
		return;

	if (request != get_last_request())
		kfree(request);
}

static void reg_free_last_request(void)
{
	struct regulatory_request *lr = get_last_request();

	if (lr != &core_request_world && lr)
		kfree_rcu(lr, rcu_head);
}

static void reg_update_last_request(struct regulatory_request *request)
{
	struct regulatory_request *lr;

	lr = get_last_request();
	if (lr == request)
		return;

	reg_free_last_request();
	rcu_assign_pointer(last_request, request);
}

Annotation

Implementation Notes