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-rw-r--r--net/phonet/sysctl.c96
1 files changed, 96 insertions, 0 deletions
diff --git a/net/phonet/sysctl.c b/net/phonet/sysctl.c
new file mode 100644
index 000000000..0d0bf4138
--- /dev/null
+++ b/net/phonet/sysctl.c
@@ -0,0 +1,96 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * File: sysctl.c
+ *
+ * Phonet /proc/sys/net/phonet interface implementation
+ *
+ * Copyright (C) 2008 Nokia Corporation.
+ *
+ * Author: RĂ©mi Denis-Courmont
+ */
+
+#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 *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);
+}