wext: refactor

Refactor wext to
 * split out iwpriv handling
 * split out iwspy handling
 * split out procfs support
 * allow cfg80211 to have wireless extensions compat code
   w/o CONFIG_WIRELESS_EXT

After this, drivers need to
 - select WIRELESS_EXT	- for wext support
 - select WEXT_PRIV	- for iwpriv support
 - select WEXT_SPY	- for iwspy support

except cfg80211 -- which gets new hooks in wext-core.c
and can then get wext handlers without CONFIG_WIRELESS_EXT.

Wireless extensions procfs support is auto-selected
based on PROC_FS and anything that requires the wext core
(i.e. WIRELESS_EXT or CFG80211_WEXT).

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

1 files changed, 155 insertions, 0 deletions

diff --git a/net/wireless/wext-proc.c b/net/wireless/wext-proc.c
new file mode 100644
index 000000000000..273a7f77c834
--- /dev/null
+++ b/net/wireless/wext-proc.c
@@ -0,0 +1,155 @@
+/*
+ * This file implement the Wireless Extensions proc API.
+ *
+ * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>
+ * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
+ *
+ * (As all part of the Linux kernel, this file is GPL)
+ */
+
+/*
+ * The /proc/net/wireless file is a human readable user-space interface
+ * exporting various wireless specific statistics from the wireless devices.
+ * This is the most popular part of the Wireless Extensions ;-)
+ *
+ * This interface is a pure clone of /proc/net/dev (in net/core/dev.c).
+ * The content of the file is basically the content of "struct iw_statistics".
+ */
+
+#include <linux/module.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/wireless.h>
+#include <linux/netdevice.h>
+#include <linux/rtnetlink.h>
+#include <net/iw_handler.h>
+#include <net/wext.h>
+
+
+static void wireless_seq_printf_stats(struct seq_file *seq,
+                                      struct net_device *dev)
+{
+        /* Get stats from the driver */
+        struct iw_statistics *stats = get_wireless_stats(dev);
+        static struct iw_statistics nullstats = {};
+
+        /* show device if it's wireless regardless of current stats */
+        if (!stats) {
+#ifdef CONFIG_WIRELESS_EXT
+                if (dev->wireless_handlers)
+                        stats = &nullstats;
+#endif
+#ifdef CONFIG_CFG80211
+                if (dev->ieee80211_ptr)
+                        stats = &nullstats;
+#endif
+        }
+
+        if (stats) {
+                seq_printf(seq, "%6s: %04x  %3d%c  %3d%c  %3d%c  %6d %6d %6d "
+                                "%6d %6d   %6d\n",
+                           dev->name, stats->status, stats->qual.qual,
+                           stats->qual.updated & IW_QUAL_QUAL_UPDATED
+                           ? '.' : ' ',
+                           ((__s32) stats->qual.level) -
+                           ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
+                           stats->qual.updated & IW_QUAL_LEVEL_UPDATED
+                           ? '.' : ' ',
+                           ((__s32) stats->qual.noise) -
+                           ((stats->qual.updated & IW_QUAL_DBM) ? 0x100 : 0),
+                           stats->qual.updated & IW_QUAL_NOISE_UPDATED
+                           ? '.' : ' ',
+                           stats->discard.nwid, stats->discard.code,
+                           stats->discard.fragment, stats->discard.retries,
+                           stats->discard.misc, stats->miss.beacon);
+
+                if (stats != &nullstats)
+                        stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
+        }
+}
+
+/* ---------------------------------------------------------------- */
+/*
+ * Print info for /proc/net/wireless (print all entries)
+ */
+static int wireless_dev_seq_show(struct seq_file *seq, void *v)
+{
+        might_sleep();
+
+        if (v == SEQ_START_TOKEN)
+                seq_printf(seq, "Inter-| sta-|   Quality        |   Discarded "
+                                "packets               | Missed | WE\n"
+                                " face | tus | link level noise |  nwid  "
+                                "crypt   frag  retry   misc | beacon | %d\n",
+                           WIRELESS_EXT);
+        else
+                wireless_seq_printf_stats(seq, v);
+        return 0;
+}
+
+static void *wireless_dev_seq_start(struct seq_file *seq, loff_t *pos)
+{
+        struct net *net = seq_file_net(seq);
+        loff_t off;
+        struct net_device *dev;
+
+        rtnl_lock();
+        if (!*pos)
+                return SEQ_START_TOKEN;
+
+        off = 1;
+        for_each_netdev(net, dev)
+                if (off++ == *pos)
+                        return dev;
+        return NULL;
+}
+
+static void *wireless_dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+        struct net *net = seq_file_net(seq);
+
+        ++*pos;
+
+        return v == SEQ_START_TOKEN ?
+                first_net_device(net) : next_net_device(v);
+}
+
+static void wireless_dev_seq_stop(struct seq_file *seq, void *v)
+{
+        rtnl_unlock();
+}
+
+static const struct seq_operations wireless_seq_ops = {
+        .start = wireless_dev_seq_start,
+        .next  = wireless_dev_seq_next,
+        .stop  = wireless_dev_seq_stop,
+        .show  = wireless_dev_seq_show,
+};
+
+static int seq_open_wireless(struct inode *inode, struct file *file)
+{
+        return seq_open_net(inode, file, &wireless_seq_ops,
+                            sizeof(struct seq_net_private));
+}
+
+static const struct file_operations wireless_seq_fops = {
+        .owner   = THIS_MODULE,
+        .open    = seq_open_wireless,
+        .read    = seq_read,
+        .llseek  = seq_lseek,
+        .release = seq_release_net,
+};
+
+int wext_proc_init(struct net *net)
+{
+        /* Create /proc/net/wireless entry */
+        if (!proc_net_fops_create(net, "wireless", S_IRUGO, &wireless_seq_fops))
+                return -ENOMEM;
+
+        return 0;
+}
+
+void wext_proc_exit(struct net *net)
+{
+        proc_net_remove(net, "wireless");
+}