Commit f130347c authored by Luis R. Rodriguez's avatar Luis R. Rodriguez Committed by John W. Linville
Browse files

cfg80211: add get reg command 



This lets userspace request to get the currently set
regulatory domain.

Signed-off-by: default avatarLuis R. Rodriguez <lrodriguez@atheros.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 47f4d887

include/linux/nl80211.h

+4 −0
Original line number Diff line number Diff line
@@ -113,6 +113,8 @@ 
 * @NL80211_CMD_SET_BSS: Set BSS attributes for BSS identified by

 *	%NL80211_ATTR_IFINDEX.

 *

 * @NL80211_CMD_GET_REG: ask the wireless core to send us its currently set

 * 	regulatory domain.

 * @NL80211_CMD_SET_REG: Set current regulatory domain. CRDA sends this command

 *	after being queried by the kernel. CRDA replies by sending a regulatory

 *	domain structure which consists of %NL80211_ATTR_REG_ALPHA set to our
@@ -188,6 +190,8 @@ enum nl80211_commands { 


	NL80211_CMD_SET_MGMT_EXTRA_IE,



	NL80211_CMD_GET_REG,



	/* add new commands above here */



	/* used to define NL80211_CMD_MAX below */

net/wireless/nl80211.c

+81 −0
Original line number Diff line number Diff line
@@ -2093,6 +2093,81 @@ static int nl80211_set_mesh_params(struct sk_buff *skb, struct genl_info *info) 


#undef FILL_IN_MESH_PARAM_IF_SET



static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)

{

	struct sk_buff *msg;

	void *hdr = NULL;

	struct nlattr *nl_reg_rules;

	unsigned int i;

	int err = -EINVAL;



	mutex_lock(&cfg80211_drv_mutex);



	if (!cfg80211_regdomain)

		goto out;



	msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);

	if (!msg) {

		err = -ENOBUFS;

		goto out;

	}



	hdr = nl80211hdr_put(msg, info->snd_pid, info->snd_seq, 0,

			     NL80211_CMD_GET_REG);

	if (!hdr)

		goto nla_put_failure;



	NLA_PUT_STRING(msg, NL80211_ATTR_REG_ALPHA2,

		cfg80211_regdomain->alpha2);



	nl_reg_rules = nla_nest_start(msg, NL80211_ATTR_REG_RULES);

	if (!nl_reg_rules)

		goto nla_put_failure;



	for (i = 0; i < cfg80211_regdomain->n_reg_rules; i++) {

		struct nlattr *nl_reg_rule;

		const struct ieee80211_reg_rule *reg_rule;

		const struct ieee80211_freq_range *freq_range;

		const struct ieee80211_power_rule *power_rule;



		reg_rule = &cfg80211_regdomain->reg_rules[i];

		freq_range = &reg_rule->freq_range;

		power_rule = &reg_rule->power_rule;



		nl_reg_rule = nla_nest_start(msg, i);

		if (!nl_reg_rule)

			goto nla_put_failure;



		NLA_PUT_U32(msg, NL80211_ATTR_REG_RULE_FLAGS,

			reg_rule->flags);

		NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_START,

			freq_range->start_freq_khz);

		NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_END,

			freq_range->end_freq_khz);

		NLA_PUT_U32(msg, NL80211_ATTR_FREQ_RANGE_MAX_BW,

			freq_range->max_bandwidth_khz);

		NLA_PUT_U32(msg, NL80211_ATTR_POWER_RULE_MAX_ANT_GAIN,

			power_rule->max_antenna_gain);

		NLA_PUT_U32(msg, NL80211_ATTR_POWER_RULE_MAX_EIRP,

			power_rule->max_eirp);



		nla_nest_end(msg, nl_reg_rule);

	}



	nla_nest_end(msg, nl_reg_rules);



	genlmsg_end(msg, hdr);

	err = genlmsg_unicast(msg, info->snd_pid);

	goto out;



nla_put_failure:

	genlmsg_cancel(msg, hdr);

	err = -EMSGSIZE;

out:

	mutex_unlock(&cfg80211_drv_mutex);

	return err;

}



static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)

{

	struct nlattr *tb[NL80211_REG_RULE_ATTR_MAX + 1];
@@ -2332,6 +2407,12 @@ static struct genl_ops nl80211_ops[] = { 
		.policy = nl80211_policy,

		.flags = GENL_ADMIN_PERM,

	},

	{

		.cmd = NL80211_CMD_GET_REG,

		.doit = nl80211_get_reg,

		.policy = nl80211_policy,

		/* can be retrieved by unprivileged users */

	},

	{

		.cmd = NL80211_CMD_SET_REG,

		.doit = nl80211_set_reg,

net/wireless/reg.c

+1 −1
Original line number Diff line number Diff line
@@ -57,7 +57,7 @@ static u32 supported_bandwidths[] = { 
/* Central wireless core regulatory domains, we only need two,

 * the current one and a world regulatory domain in case we have no

 * information to give us an alpha2 */

static const struct ieee80211_regdomain *cfg80211_regdomain;

const struct ieee80211_regdomain *cfg80211_regdomain;



/* We use this as a place for the rd structure built from the

 * last parsed country IE to rest until CRDA gets back to us with

net/wireless/reg.h

+2 −0
Original line number Diff line number Diff line 
#ifndef __NET_WIRELESS_REG_H

#define __NET_WIRELESS_REG_H



extern const struct ieee80211_regdomain *cfg80211_regdomain;



bool is_world_regdom(const char *alpha2);

bool reg_is_valid_request(const char *alpha2);