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authorArik Nemtsov <arik@wizery.com>2014-12-15 19:25:59 +0200
committerJohannes Berg <johannes.berg@intel.com>2014-12-17 11:49:55 +0100
commitad30ca2c03cecfb1b0749874bdceead269542de6 (patch)
tree72f6782278fd458c5d57b38123c2c8e74ec51eab /net/wireless/nl80211.c
parent2ae70efcea7a695a62bb47170d3fb16674b8dbea (diff)
cfg80211: allow usermode to query wiphy specific regdom
If a wiphy-idx is specified, the kernel will return the wiphy specific regdomain, if such exists. Otherwise return the global regdom. When no wiphy-idx is specified, return the global regdomain as well as all wiphy-specific regulatory domains in the system, via a new nested list of attributes. Add a new attribute for each wiphy-specific regdomain, for usermode to identify it as such. Signed-off-by: Arik Nemtsov <arikx.nemtsov@intel.com> Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Diffstat (limited to 'net/wireless/nl80211.c')
-rw-r--r--net/wireless/nl80211.c173
1 files changed, 140 insertions, 33 deletions
diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index a17d6bc6b22c..2d5dc428c5ab 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -5327,42 +5327,20 @@ static int nl80211_update_mesh_config(struct sk_buff *skb,
return err;
}
-static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
+static int nl80211_put_regdom(const struct ieee80211_regdomain *regdom,
+ struct sk_buff *msg)
{
- const struct ieee80211_regdomain *regdom;
- struct sk_buff *msg;
- void *hdr = NULL;
struct nlattr *nl_reg_rules;
unsigned int i;
- if (!cfg80211_regdomain)
- return -EINVAL;
-
- msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
- if (!msg)
- return -ENOBUFS;
-
- hdr = nl80211hdr_put(msg, info->snd_portid, info->snd_seq, 0,
- NL80211_CMD_GET_REG);
- if (!hdr)
- goto put_failure;
-
- if (reg_last_request_cell_base() &&
- nla_put_u32(msg, NL80211_ATTR_USER_REG_HINT_TYPE,
- NL80211_USER_REG_HINT_CELL_BASE))
- goto nla_put_failure;
-
- rcu_read_lock();
- regdom = rcu_dereference(cfg80211_regdomain);
-
if (nla_put_string(msg, NL80211_ATTR_REG_ALPHA2, regdom->alpha2) ||
(regdom->dfs_region &&
nla_put_u8(msg, NL80211_ATTR_DFS_REGION, regdom->dfs_region)))
- goto nla_put_failure_rcu;
+ goto nla_put_failure;
nl_reg_rules = nla_nest_start(msg, NL80211_ATTR_REG_RULES);
if (!nl_reg_rules)
- goto nla_put_failure_rcu;
+ goto nla_put_failure;
for (i = 0; i < regdom->n_reg_rules; i++) {
struct nlattr *nl_reg_rule;
@@ -5377,7 +5355,7 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
nl_reg_rule = nla_nest_start(msg, i);
if (!nl_reg_rule)
- goto nla_put_failure_rcu;
+ goto nla_put_failure;
max_bandwidth_khz = freq_range->max_bandwidth_khz;
if (!max_bandwidth_khz)
@@ -5398,13 +5376,64 @@ static int nl80211_get_reg(struct sk_buff *skb, struct genl_info *info)
power_rule->max_eirp) ||
nla_put_u32(msg, NL80211_ATTR_DFS_CAC_TIME,
reg_rule->dfs_cac_ms))
- goto nla_put_failure_rcu;
+ goto nla_put_failure;
nla_nest_end(msg, nl_reg_rule);
}
- rcu_read_unlock();
nla_nest_end(msg, nl_reg_rules);
+ return 0;
+
+nla_put_failure:
+ return -EMSGSIZE;
+}
+
+static int nl80211_get_reg_do(struct sk_buff *skb, struct genl_info *info)
+{
+ const struct ieee80211_regdomain *regdom = NULL;
+ struct cfg80211_registered_device *rdev;
+ struct wiphy *wiphy = NULL;
+ struct sk_buff *msg;
+ void *hdr;
+
+ msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (!msg)
+ return -ENOBUFS;
+
+ hdr = nl80211hdr_put(msg, info->snd_portid, info->snd_seq, 0,
+ NL80211_CMD_GET_REG);
+ if (!hdr)
+ goto put_failure;
+
+ if (info->attrs[NL80211_ATTR_WIPHY]) {
+ rdev = cfg80211_get_dev_from_info(genl_info_net(info), info);
+ if (IS_ERR(rdev)) {
+ nlmsg_free(msg);
+ return PTR_ERR(rdev);
+ }
+
+ wiphy = &rdev->wiphy;
+ regdom = get_wiphy_regdom(wiphy);
+
+ if (regdom &&
+ nla_put_u32(msg, NL80211_ATTR_WIPHY, get_wiphy_idx(wiphy)))
+ goto nla_put_failure;
+ }
+
+ if (!wiphy && reg_last_request_cell_base() &&
+ nla_put_u32(msg, NL80211_ATTR_USER_REG_HINT_TYPE,
+ NL80211_USER_REG_HINT_CELL_BASE))
+ goto nla_put_failure;
+
+ rcu_read_lock();
+
+ if (!regdom)
+ regdom = rcu_dereference(cfg80211_regdomain);
+
+ if (nl80211_put_regdom(regdom, msg))
+ goto nla_put_failure_rcu;
+
+ rcu_read_unlock();
genlmsg_end(msg, hdr);
return genlmsg_reply(msg, info);
@@ -5418,6 +5447,79 @@ put_failure:
return -EMSGSIZE;
}
+static int nl80211_send_regdom(struct sk_buff *msg, struct netlink_callback *cb,
+ u32 seq, int flags, struct wiphy *wiphy,
+ const struct ieee80211_regdomain *regdom)
+{
+ void *hdr = nl80211hdr_put(msg, NETLINK_CB(cb->skb).portid, seq, flags,
+ NL80211_CMD_GET_REG);
+
+ if (!hdr)
+ return -1;
+
+ genl_dump_check_consistent(cb, hdr, &nl80211_fam);
+
+ if (nl80211_put_regdom(regdom, msg))
+ goto nla_put_failure;
+
+ if (!wiphy && reg_last_request_cell_base() &&
+ nla_put_u32(msg, NL80211_ATTR_USER_REG_HINT_TYPE,
+ NL80211_USER_REG_HINT_CELL_BASE))
+ goto nla_put_failure;
+
+ if (wiphy &&
+ nla_put_u32(msg, NL80211_ATTR_WIPHY, get_wiphy_idx(wiphy)))
+ goto nla_put_failure;
+
+ return genlmsg_end(msg, hdr);
+
+nla_put_failure:
+ genlmsg_cancel(msg, hdr);
+ return -EMSGSIZE;
+}
+
+static int nl80211_get_reg_dump(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ const struct ieee80211_regdomain *regdom = NULL;
+ struct cfg80211_registered_device *rdev;
+ int err, reg_idx, start = cb->args[2];
+
+ rtnl_lock();
+
+ if (cfg80211_regdomain && start == 0) {
+ err = nl80211_send_regdom(skb, cb, cb->nlh->nlmsg_seq,
+ NLM_F_MULTI, NULL,
+ rtnl_dereference(cfg80211_regdomain));
+ if (err < 0)
+ goto out_err;
+ }
+
+ /* the global regdom is idx 0 */
+ reg_idx = 1;
+ list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
+ regdom = get_wiphy_regdom(&rdev->wiphy);
+ if (!regdom)
+ continue;
+
+ if (++reg_idx <= start)
+ continue;
+
+ err = nl80211_send_regdom(skb, cb, cb->nlh->nlmsg_seq,
+ NLM_F_MULTI, &rdev->wiphy, regdom);
+ if (err < 0) {
+ reg_idx--;
+ break;
+ }
+ }
+
+ cb->args[2] = reg_idx;
+ err = skb->len;
+out_err:
+ rtnl_unlock();
+ return err;
+}
+
static int nl80211_set_reg(struct sk_buff *skb, struct genl_info *info)
{
struct nlattr *tb[NL80211_REG_RULE_ATTR_MAX + 1];
@@ -10225,7 +10327,8 @@ static const struct genl_ops nl80211_ops[] = {
},
{
.cmd = NL80211_CMD_GET_REG,
- .doit = nl80211_get_reg,
+ .doit = nl80211_get_reg_do,
+ .dumpit = nl80211_get_reg_dump,
.policy = nl80211_policy,
.internal_flags = NL80211_FLAG_NEED_RTNL,
/* can be retrieved by unprivileged users */
@@ -10983,9 +11086,13 @@ void nl80211_send_reg_change_event(struct regulatory_request *request)
goto nla_put_failure;
}
- if (request->wiphy_idx != WIPHY_IDX_INVALID &&
- nla_put_u32(msg, NL80211_ATTR_WIPHY, request->wiphy_idx))
- goto nla_put_failure;
+ if (request->wiphy_idx != WIPHY_IDX_INVALID) {
+ struct wiphy *wiphy = wiphy_idx_to_wiphy(request->wiphy_idx);
+
+ if (wiphy &&
+ nla_put_u32(msg, NL80211_ATTR_WIPHY, request->wiphy_idx))
+ goto nla_put_failure;
+ }
genlmsg_end(msg, hdr);