cfg80211: introduce nl80211 testmode command

This introduces a new NL80211_CMD_TESTMODE for testing
and calibration use with nl80211. There's no multiplexing
like like iwpriv had, and the command is not available by
default, it needs to be explicitly enabled in Kconfig and
shouldn't be enabled in most kernels.

The command requires a wiphy index or interface index to
identify the device to operate on, and the new TESTDATA
attribute. There also is API for sending replies to the
command, and testmode multicast messages (on a testmode
multicast group).

I've also updated mac80211 to be able to pass through the
command to the driver, since it itself doesn't implement
the testmode command.

Additionally, to give people an idea of how to use the
command, I've added a little code to hwsim that makes use
of the new command to set the powersave mode, this is
currently done via debugfs and should remain there, and
the testmode command only serves as an example of how to
use this best -- with nested netlink attributes in the
TESTDATA attribute. A hwsim testmode tool can be found at
http://git.sipsolutions.net/hwsim.git/. This tool is BSD
licensed so people can easily use it as a basis for their
own internal fabrication and validation tools.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 68 insertions, 0 deletions

diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c
index 93c1c4a73e6c..6ac8565072e9 100644
--- a/drivers/net/wireless/mac80211_hwsim.c
+++ b/drivers/net/wireless/mac80211_hwsim.c
@@ -700,6 +700,73 @@ static int mac80211_hwsim_conf_tx(
         return 0;
 }
 
+#ifdef CONFIG_NL80211_TESTMODE
+/*
+ * This section contains example code for using netlink
+ * attributes with the testmode command in nl80211.
+ */
+
+/* These enums need to be kept in sync with userspace */
+enum hwsim_testmode_attr {
+        __HWSIM_TM_ATTR_INVALID = 0,
+        HWSIM_TM_ATTR_CMD       = 1,
+        HWSIM_TM_ATTR_PS        = 2,
+
+        /* keep last */
+        __HWSIM_TM_ATTR_AFTER_LAST,
+        HWSIM_TM_ATTR_MAX       = __HWSIM_TM_ATTR_AFTER_LAST - 1
+};
+
+enum hwsim_testmode_cmd {
+        HWSIM_TM_CMD_SET_PS             = 0,
+        HWSIM_TM_CMD_GET_PS             = 1,
+};
+
+static const struct nla_policy hwsim_testmode_policy[HWSIM_TM_ATTR_MAX + 1] = {
+        [HWSIM_TM_ATTR_CMD] = { .type = NLA_U32 },
+        [HWSIM_TM_ATTR_PS] = { .type = NLA_U32 },
+};
+
+static int hwsim_fops_ps_write(void *dat, u64 val);
+
+int mac80211_hwsim_testmode_cmd(struct ieee80211_hw *hw, void *data, int len)
+{
+        struct mac80211_hwsim_data *hwsim = hw->priv;
+        struct nlattr *tb[HWSIM_TM_ATTR_MAX + 1];
+        struct sk_buff *skb;
+        int err, ps;
+
+        err = nla_parse(tb, HWSIM_TM_ATTR_MAX, data, len,
+                        hwsim_testmode_policy);
+        if (err)
+                return err;
+
+        if (!tb[HWSIM_TM_ATTR_CMD])
+                return -EINVAL;
+
+        switch (nla_get_u32(tb[HWSIM_TM_ATTR_CMD])) {
+        case HWSIM_TM_CMD_SET_PS:
+                if (!tb[HWSIM_TM_ATTR_PS])
+                        return -EINVAL;
+                ps = nla_get_u32(tb[HWSIM_TM_ATTR_PS]);
+                return hwsim_fops_ps_write(hwsim, ps);
+        case HWSIM_TM_CMD_GET_PS:
+                skb = cfg80211_testmode_alloc_reply_skb(hw->wiphy,
+                                                nla_total_size(sizeof(u32)));
+                if (!skb)
+                        return -ENOMEM;
+                NLA_PUT_U32(skb, HWSIM_TM_ATTR_PS, hwsim->ps);
+                return cfg80211_testmode_reply(skb);
+        default:
+                return -EOPNOTSUPP;
+        }
+
+ nla_put_failure:
+        kfree_skb(skb);
+        return -ENOBUFS;
+}
+#endif
+
 static const struct ieee80211_ops mac80211_hwsim_ops =
 {
         .tx = mac80211_hwsim_tx,
@@ -713,6 +780,7 @@ static const struct ieee80211_ops mac80211_hwsim_ops =
         .sta_notify = mac80211_hwsim_sta_notify,
         .set_tim = mac80211_hwsim_set_tim,
         .conf_tx = mac80211_hwsim_conf_tx,
+        CFG80211_TESTMODE_CMD(mac80211_hwsim_testmode_cmd)
 };