wimax: Add netlink interface to get device state

wimax connection manager / daemon has to know what is current
state of the device. Previously it was only possible to get
notification whet state has changed.

Note:

 By mistake, the new generic netlink's number for
 WIMAX_GNL_OP_STATE_GET was declared inserting into the existing list
 of API calls, not appending; thus, it'd break existing API.

 Fixed by Inaky Perez-Gonzalez <inaky@linux.intel.com> by moving to
 the tail, where we add to the interface, not modify the interface.

 Thanks to Stephen Hemminger <shemminger@vyatta.com> for catching this.

Signed-off-by: Paulius Zaleckas <paulius.zaleckas@teltonika.lt>

6 files changed, 98 insertions, 1 deletions

diff --git a/include/linux/wimax.h b/include/linux/wimax.h
index c89de7f4e5b9..2f7a6b77d6b3 100644
--- a/include/linux/wimax.h
+++ b/include/linux/wimax.h
@@ -78,6 +78,7 @@ enum {
         WIMAX_GNL_OP_RFKILL,    /* Run wimax_rfkill() */
         WIMAX_GNL_OP_RESET,     /* Run wimax_rfkill() */
         WIMAX_GNL_RE_STATE_CHANGE,      /* Report: status change */
+        WIMAX_GNL_OP_STATE_GET,         /* Request for current state */
 };
 
 
@@ -113,6 +114,10 @@ enum {
         WIMAX_GNL_RESET_IFIDX = 1,
 };
 
+/* Atributes for wimax_state_get() */
+enum {
+        WIMAX_GNL_STGET_IFIDX = 1,
+};
 
 /*
  * Attributes for the Report State Change
diff --git a/net/wimax/Makefile b/net/wimax/Makefile
index 5b80b941c2c9..8f1510d0cc2b 100644
--- a/net/wimax/Makefile
+++ b/net/wimax/Makefile
@@ -6,6 +6,7 @@ wimax-y :=		\
         op-msg.o        \
         op-reset.o      \
         op-rfkill.o     \
+        op-state-get.o  \
         stack.o
 
 wimax-$(CONFIG_DEBUG_FS) += debugfs.o
diff --git a/net/wimax/debug-levels.h b/net/wimax/debug-levels.h
index 1c29123a3aa9..0975adba6b71 100644
--- a/net/wimax/debug-levels.h
+++ b/net/wimax/debug-levels.h
@@ -36,6 +36,7 @@ enum d_module {
         D_SUBMODULE_DECLARE(op_msg),
         D_SUBMODULE_DECLARE(op_reset),
         D_SUBMODULE_DECLARE(op_rfkill),
+        D_SUBMODULE_DECLARE(op_state_get),
         D_SUBMODULE_DECLARE(stack),
 };
 
diff --git a/net/wimax/debugfs.c b/net/wimax/debugfs.c
index 94d216a46407..6c9bedb7431e 100644
--- a/net/wimax/debugfs.c
+++ b/net/wimax/debugfs.c
@@ -61,6 +61,7 @@ int wimax_debugfs_add(struct wimax_dev *wimax_dev)
         __debugfs_register("wimax_dl_", op_msg, dentry);
         __debugfs_register("wimax_dl_", op_reset, dentry);
         __debugfs_register("wimax_dl_", op_rfkill, dentry);
+        __debugfs_register("wimax_dl_", op_state_get, dentry);
         __debugfs_register("wimax_dl_", stack, dentry);
         result = 0;
 out:
diff --git a/net/wimax/op-state-get.c b/net/wimax/op-state-get.c
new file mode 100644
index 000000000000..a76b8fcb056d
--- /dev/null
+++ b/net/wimax/op-state-get.c
@@ -0,0 +1,86 @@
+/*
+ * Linux WiMAX
+ * Implement and export a method for getting a WiMAX device current state
+ *
+ * Copyright (C) 2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * Based on previous WiMAX core work by:
+ *  Copyright (C) 2008 Intel Corporation <linux-wimax@intel.com>
+ *  Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ */
+
+#include <net/wimax.h>
+#include <net/genetlink.h>
+#include <linux/wimax.h>
+#include <linux/security.h>
+#include "wimax-internal.h"
+
+#define D_SUBMODULE op_state_get
+#include "debug-levels.h"
+
+
+static const
+struct nla_policy wimax_gnl_state_get_policy[WIMAX_GNL_ATTR_MAX + 1] = {
+        [WIMAX_GNL_STGET_IFIDX] = {
+                .type = NLA_U32,
+        },
+};
+
+
+/*
+ * Exporting to user space over generic netlink
+ *
+ * Parse the state get command from user space, return a combination
+ * value that describe the current state.
+ *
+ * No attributes.
+ */
+static
+int wimax_gnl_doit_state_get(struct sk_buff *skb, struct genl_info *info)
+{
+        int result, ifindex;
+        struct wimax_dev *wimax_dev;
+        struct device *dev;
+
+        d_fnstart(3, NULL, "(skb %p info %p)\n", skb, info);
+        result = -ENODEV;
+        if (info->attrs[WIMAX_GNL_STGET_IFIDX] == NULL) {
+                printk(KERN_ERR "WIMAX_GNL_OP_STATE_GET: can't find IFIDX "
+                        "attribute\n");
+                goto error_no_wimax_dev;
+        }
+        ifindex = nla_get_u32(info->attrs[WIMAX_GNL_STGET_IFIDX]);
+        wimax_dev = wimax_dev_get_by_genl_info(info, ifindex);
+        if (wimax_dev == NULL)
+                goto error_no_wimax_dev;
+        dev = wimax_dev_to_dev(wimax_dev);
+        /* Execute the operation and send the result back to user space */
+        result = wimax_state_get(wimax_dev);
+        dev_put(wimax_dev->net_dev);
+error_no_wimax_dev:
+        d_fnend(3, NULL, "(skb %p info %p) = %d\n", skb, info, result);
+        return result;
+}
+
+
+struct genl_ops wimax_gnl_state_get = {
+        .cmd = WIMAX_GNL_OP_STATE_GET,
+        .flags = GENL_ADMIN_PERM,
+        .policy = wimax_gnl_state_get_policy,
+        .doit = wimax_gnl_doit_state_get,
+        .dumpit = NULL,
+};
diff --git a/net/wimax/stack.c b/net/wimax/stack.c
index 933e1422b09f..79fb7d7c640f 100644
--- a/net/wimax/stack.c
+++ b/net/wimax/stack.c
@@ -402,13 +402,15 @@ EXPORT_SYMBOL_GPL(wimax_dev_init);
 extern struct genl_ops
         wimax_gnl_msg_from_user,
         wimax_gnl_reset,
-        wimax_gnl_rfkill;
+        wimax_gnl_rfkill,
+        wimax_gnl_state_get;
 
 static
 struct genl_ops *wimax_gnl_ops[] = {
         &wimax_gnl_msg_from_user,
         &wimax_gnl_reset,
         &wimax_gnl_rfkill,
+        &wimax_gnl_state_get,
 };
 
 
@@ -533,6 +535,7 @@ struct d_level D_LEVEL[] = {
         D_SUBMODULE_DEFINE(op_msg),
         D_SUBMODULE_DEFINE(op_reset),
         D_SUBMODULE_DEFINE(op_rfkill),
+        D_SUBMODULE_DEFINE(op_state_get),
         D_SUBMODULE_DEFINE(stack),
 };
 size_t D_LEVEL_SIZE = ARRAY_SIZE(D_LEVEL);