v4.19.13 snapshot.
diff --git a/net/ax25/sysctl_net_ax25.c b/net/ax25/sysctl_net_ax25.c
new file mode 100644
index 0000000..919a5ce
--- /dev/null
+++ b/net/ax25/sysctl_net_ax25.c
@@ -0,0 +1,184 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * Copyright (C) 1996 Mike Shaver (shaver@zeroknowledge.com)
+ */
+#include <linux/mm.h>
+#include <linux/slab.h>
+#include <linux/sysctl.h>
+#include <linux/spinlock.h>
+#include <net/ax25.h>
+
+static int min_ipdefmode[1], max_ipdefmode[] = {1};
+static int min_axdefmode[1], max_axdefmode[] = {1};
+static int min_backoff[1], max_backoff[] = {2};
+static int min_conmode[1], max_conmode[] = {2};
+static int min_window[] = {1}, max_window[] = {7};
+static int min_ewindow[] = {1}, max_ewindow[] = {63};
+static int min_t1[] = {1}, max_t1[] = {30000};
+static int min_t2[] = {1}, max_t2[] = {20000};
+static int min_t3[1], max_t3[] = {3600000};
+static int min_idle[1], max_idle[] = {65535000};
+static int min_n2[] = {1}, max_n2[] = {31};
+static int min_paclen[] = {1}, max_paclen[] = {512};
+static int min_proto[1], max_proto[] = { AX25_PROTO_MAX };
+#ifdef CONFIG_AX25_DAMA_SLAVE
+static int min_ds_timeout[1], max_ds_timeout[] = {65535000};
+#endif
+
+static const struct ctl_table ax25_param_table[] = {
+ {
+ .procname = "ip_default_mode",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_ipdefmode,
+ .extra2 = &max_ipdefmode
+ },
+ {
+ .procname = "ax25_default_mode",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_axdefmode,
+ .extra2 = &max_axdefmode
+ },
+ {
+ .procname = "backoff_type",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_backoff,
+ .extra2 = &max_backoff
+ },
+ {
+ .procname = "connect_mode",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_conmode,
+ .extra2 = &max_conmode
+ },
+ {
+ .procname = "standard_window_size",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_window,
+ .extra2 = &max_window
+ },
+ {
+ .procname = "extended_window_size",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_ewindow,
+ .extra2 = &max_ewindow
+ },
+ {
+ .procname = "t1_timeout",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_t1,
+ .extra2 = &max_t1
+ },
+ {
+ .procname = "t2_timeout",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_t2,
+ .extra2 = &max_t2
+ },
+ {
+ .procname = "t3_timeout",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_t3,
+ .extra2 = &max_t3
+ },
+ {
+ .procname = "idle_timeout",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_idle,
+ .extra2 = &max_idle
+ },
+ {
+ .procname = "maximum_retry_count",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_n2,
+ .extra2 = &max_n2
+ },
+ {
+ .procname = "maximum_packet_length",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_paclen,
+ .extra2 = &max_paclen
+ },
+ {
+ .procname = "protocol",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_proto,
+ .extra2 = &max_proto
+ },
+#ifdef CONFIG_AX25_DAMA_SLAVE
+ {
+ .procname = "dama_slave_timeout",
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &min_ds_timeout,
+ .extra2 = &max_ds_timeout
+ },
+#endif
+
+ { } /* that's all, folks! */
+};
+
+int ax25_register_dev_sysctl(ax25_dev *ax25_dev)
+{
+ char path[sizeof("net/ax25/") + IFNAMSIZ];
+ int k;
+ struct ctl_table *table;
+
+ table = kmemdup(ax25_param_table, sizeof(ax25_param_table), GFP_KERNEL);
+ if (!table)
+ return -ENOMEM;
+
+ for (k = 0; k < AX25_MAX_VALUES; k++)
+ table[k].data = &ax25_dev->values[k];
+
+ snprintf(path, sizeof(path), "net/ax25/%s", ax25_dev->dev->name);
+ ax25_dev->sysheader = register_net_sysctl(&init_net, path, table);
+ if (!ax25_dev->sysheader) {
+ kfree(table);
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+void ax25_unregister_dev_sysctl(ax25_dev *ax25_dev)
+{
+ struct ctl_table_header *header = ax25_dev->sysheader;
+ struct ctl_table *table;
+
+ if (header) {
+ ax25_dev->sysheader = NULL;
+ table = header->ctl_table_arg;
+ unregister_net_sysctl_table(header);
+ kfree(table);
+ }
+}