Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / net / phonet / sysctl.c

diff --git a/kernel/net/phonet/sysctl.c b/kernel/net/phonet/sysctl.c
new file mode 100644 (file)
index 0000000..c02a8c4
--- /dev/null
+++ b/kernel/net/phonet/sysctl.c
@@ -0,0 +1,110 @@
+/*
+ * File: sysctl.c
+ *
+ * Phonet /proc/sys/net/phonet interface implementation
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Author: Rémi Denis-Courmont
+ *
+ * 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 St, Fifth Floor, Boston, MA
+ * 02110-1301 USA
+ */
+
+#include <linux/seqlock.h>
+#include <linux/sysctl.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+
+#include <net/sock.h>
+#include <linux/phonet.h>
+#include <net/phonet/phonet.h>
+
+#define DYNAMIC_PORT_MIN       0x40
+#define DYNAMIC_PORT_MAX       0x7f
+
+static DEFINE_SEQLOCK(local_port_range_lock);
+static int local_port_range_min[2] = {0, 0};
+static int local_port_range_max[2] = {1023, 1023};
+static int local_port_range[2] = {DYNAMIC_PORT_MIN, DYNAMIC_PORT_MAX};
+static struct ctl_table_header *phonet_table_hrd;
+
+static void set_local_port_range(int range[2])
+{
+       write_seqlock(&local_port_range_lock);
+       local_port_range[0] = range[0];
+       local_port_range[1] = range[1];
+       write_sequnlock(&local_port_range_lock);
+}
+
+void phonet_get_local_port_range(int *min, int *max)
+{
+       unsigned int seq;
+
+       do {
+               seq = read_seqbegin(&local_port_range_lock);
+               if (min)
+                       *min = local_port_range[0];
+               if (max)
+                       *max = local_port_range[1];
+       } while (read_seqretry(&local_port_range_lock, seq));
+}
+
+static int proc_local_port_range(struct ctl_table *table, int write,
+                               void __user *buffer,
+                               size_t *lenp, loff_t *ppos)
+{
+       int ret;
+       int range[2] = {local_port_range[0], local_port_range[1]};
+       struct ctl_table tmp = {
+               .data = &range,
+               .maxlen = sizeof(range),
+               .mode = table->mode,
+               .extra1 = &local_port_range_min,
+               .extra2 = &local_port_range_max,
+       };
+
+       ret = proc_dointvec_minmax(&tmp, write, buffer, lenp, ppos);
+
+       if (write && ret == 0) {
+               if (range[1] < range[0])
+                       ret = -EINVAL;
+               else
+                       set_local_port_range(range);
+       }
+
+       return ret;
+}
+
+static struct ctl_table phonet_table[] = {
+       {
+               .procname       = "local_port_range",
+               .data           = &local_port_range,
+               .maxlen         = sizeof(local_port_range),
+               .mode           = 0644,
+               .proc_handler   = proc_local_port_range,
+       },
+       { }
+};
+
+int __init phonet_sysctl_init(void)
+{
+       phonet_table_hrd = register_net_sysctl(&init_net, "net/phonet", phonet_table);
+       return phonet_table_hrd == NULL ? -ENOMEM : 0;
+}
+
+void phonet_sysctl_exit(void)
+{
+       unregister_net_sysctl_table(phonet_table_hrd);
+}