nl80211: Add frequency configuration (including HT40)

This patch adds new NL80211_CMD_SET_WIPHY attributes
NL80211_ATTR_WIPHY_FREQ and NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET to allow
userspace to set the operating channel (e.g., hostapd for AP mode).

Signed-off-by: Jouni Malinen <jouni.malinen@atheros.com>
Acked-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 57 insertions, 0 deletions

diff --git a/net/wireless/nl80211.c b/net/wireless/nl80211.c
index c9141e3df9ba..9caee6022e3f 100644
--- a/net/wireless/nl80211.c
+++ b/net/wireless/nl80211.c
@@ -59,6 +59,8 @@ static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
         [NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
                                       .len = BUS_ID_SIZE-1 },
         [NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
+        [NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
+        [NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET] = { .type = NLA_U32 },
 
         [NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
         [NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
@@ -359,6 +361,61 @@ static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
                 }
         }
 
+        if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
+                enum nl80211_sec_chan_offset sec_chan_offset =
+                        NL80211_SEC_CHAN_NO_HT;
+                struct ieee80211_channel *chan;
+                u32 freq, sec_freq;
+
+                if (!rdev->ops->set_channel) {
+                        result = -EOPNOTSUPP;
+                        goto bad_res;
+                }
+
+                if (info->attrs[NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET]) {
+                        sec_chan_offset = nla_get_u32(
+                                info->attrs[
+                                        NL80211_ATTR_WIPHY_SEC_CHAN_OFFSET]);
+                        if (sec_chan_offset != NL80211_SEC_CHAN_NO_HT &&
+                            sec_chan_offset != NL80211_SEC_CHAN_DISABLED &&
+                            sec_chan_offset != NL80211_SEC_CHAN_BELOW &&
+                            sec_chan_offset != NL80211_SEC_CHAN_ABOVE) {
+                                result = -EINVAL;
+                                goto bad_res;
+                        }
+                }
+
+                freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
+                chan = ieee80211_get_channel(&rdev->wiphy, freq);
+                if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) {
+                        /* Primary channel not allowed */
+                        result = -EINVAL;
+                        goto bad_res;
+                }
+                if (sec_chan_offset == NL80211_SEC_CHAN_BELOW)
+                        sec_freq = freq - 20;
+                else if (sec_chan_offset == NL80211_SEC_CHAN_ABOVE)
+                        sec_freq = freq + 20;
+                else
+                        sec_freq = 0;
+
+                if (sec_freq) {
+                        struct ieee80211_channel *schan;
+                        schan = ieee80211_get_channel(&rdev->wiphy, sec_freq);
+                        if (!schan || schan->flags & IEEE80211_CHAN_DISABLED) {
+                                /* Secondary channel not allowed */
+                                result = -EINVAL;
+                                goto bad_res;
+                        }
+                }
+
+                result = rdev->ops->set_channel(&rdev->wiphy, chan,
+                                                sec_chan_offset);
+                if (result)
+                        goto bad_res;
+        }
+
+
 bad_res:
         cfg80211_put_dev(rdev);
         return result;