Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 215 insertions, 0 deletions

diff --git a/net/ax25/ax25_dev.c b/net/ax25/ax25_dev.c
new file mode 100644
index 000000000..c5462486d
--- /dev/null
+++ b/net/ax25/ax25_dev.c
@@ -0,0 +1,215 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ *
+ * Copyright (C) Jonathan Naylor G4KLX (g4klx@g4klx.demon.co.uk)
+ */
+#include <linux/errno.h>
+#include <linux/types.h>
+#include <linux/socket.h>
+#include <linux/slab.h>
+#include <linux/in.h>
+#include <linux/kernel.h>
+#include <linux/timer.h>
+#include <linux/string.h>
+#include <linux/sockios.h>
+#include <linux/net.h>
+#include <linux/spinlock.h>
+#include <net/ax25.h>
+#include <linux/inet.h>
+#include <linux/netdevice.h>
+#include <linux/if_arp.h>
+#include <linux/skbuff.h>
+#include <net/sock.h>
+#include <linux/uaccess.h>
+#include <linux/fcntl.h>
+#include <linux/mm.h>
+#include <linux/interrupt.h>
+#include <linux/init.h>
+
+ax25_dev *ax25_dev_list;
+DEFINE_SPINLOCK(ax25_dev_lock);
+
+ax25_dev *ax25_addr_ax25dev(ax25_address *addr)
+{
+	ax25_dev *ax25_dev, *res = NULL;
+
+	spin_lock_bh(&ax25_dev_lock);
+	for (ax25_dev = ax25_dev_list; ax25_dev != NULL; ax25_dev = ax25_dev->next)
+		if (ax25cmp(addr, (const ax25_address *)ax25_dev->dev->dev_addr) == 0) {
+			res = ax25_dev;
+			ax25_dev_hold(ax25_dev);
+		}
+	spin_unlock_bh(&ax25_dev_lock);
+
+	return res;
+}
+
+/*
+ *	This is called when an interface is brought up. These are
+ *	reasonable defaults.
+ */
+void ax25_dev_device_up(struct net_device *dev)
+{
+	ax25_dev *ax25_dev;
+
+	ax25_dev = kzalloc(sizeof(*ax25_dev), GFP_KERNEL);
+	if (!ax25_dev) {
+		printk(KERN_ERR "AX.25: ax25_dev_device_up - out of memory\n");
+		return;
+	}
+
+	refcount_set(&ax25_dev->refcount, 1);
+	dev->ax25_ptr     = ax25_dev;
+	ax25_dev->dev     = dev;
+	netdev_hold(dev, &ax25_dev->dev_tracker, GFP_KERNEL);
+	ax25_dev->forward = NULL;
+	ax25_dev->device_up = true;
+
+	ax25_dev->values[AX25_VALUES_IPDEFMODE] = AX25_DEF_IPDEFMODE;
+	ax25_dev->values[AX25_VALUES_AXDEFMODE] = AX25_DEF_AXDEFMODE;
+	ax25_dev->values[AX25_VALUES_BACKOFF]   = AX25_DEF_BACKOFF;
+	ax25_dev->values[AX25_VALUES_CONMODE]   = AX25_DEF_CONMODE;
+	ax25_dev->values[AX25_VALUES_WINDOW]    = AX25_DEF_WINDOW;
+	ax25_dev->values[AX25_VALUES_EWINDOW]   = AX25_DEF_EWINDOW;
+	ax25_dev->values[AX25_VALUES_T1]        = AX25_DEF_T1;
+	ax25_dev->values[AX25_VALUES_T2]        = AX25_DEF_T2;
+	ax25_dev->values[AX25_VALUES_T3]        = AX25_DEF_T3;
+	ax25_dev->values[AX25_VALUES_IDLE]	= AX25_DEF_IDLE;
+	ax25_dev->values[AX25_VALUES_N2]        = AX25_DEF_N2;
+	ax25_dev->values[AX25_VALUES_PACLEN]	= AX25_DEF_PACLEN;
+	ax25_dev->values[AX25_VALUES_PROTOCOL]  = AX25_DEF_PROTOCOL;
+	ax25_dev->values[AX25_VALUES_DS_TIMEOUT]= AX25_DEF_DS_TIMEOUT;
+
+#if defined(CONFIG_AX25_DAMA_SLAVE) || defined(CONFIG_AX25_DAMA_MASTER)
+	ax25_ds_setup_timer(ax25_dev);
+#endif
+
+	spin_lock_bh(&ax25_dev_lock);
+	ax25_dev->next = ax25_dev_list;
+	ax25_dev_list  = ax25_dev;
+	spin_unlock_bh(&ax25_dev_lock);
+	ax25_dev_hold(ax25_dev);
+
+	ax25_register_dev_sysctl(ax25_dev);
+}
+
+void ax25_dev_device_down(struct net_device *dev)
+{
+	ax25_dev *s, *ax25_dev;
+
+	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+		return;
+
+	ax25_unregister_dev_sysctl(ax25_dev);
+
+	spin_lock_bh(&ax25_dev_lock);
+
+#ifdef CONFIG_AX25_DAMA_SLAVE
+	ax25_ds_del_timer(ax25_dev);
+#endif
+
+	/*
+	 *	Remove any packet forwarding that points to this device.
+	 */
+	for (s = ax25_dev_list; s != NULL; s = s->next)
+		if (s->forward == dev)
+			s->forward = NULL;
+
+	if ((s = ax25_dev_list) == ax25_dev) {
+		ax25_dev_list = s->next;
+		goto unlock_put;
+	}
+
+	while (s != NULL && s->next != NULL) {
+		if (s->next == ax25_dev) {
+			s->next = ax25_dev->next;
+			goto unlock_put;
+		}
+
+		s = s->next;
+	}
+	spin_unlock_bh(&ax25_dev_lock);
+	dev->ax25_ptr = NULL;
+	ax25_dev_put(ax25_dev);
+	return;
+
+unlock_put:
+	spin_unlock_bh(&ax25_dev_lock);
+	ax25_dev_put(ax25_dev);
+	dev->ax25_ptr = NULL;
+	netdev_put(dev, &ax25_dev->dev_tracker);
+	ax25_dev_put(ax25_dev);
+}
+
+int ax25_fwd_ioctl(unsigned int cmd, struct ax25_fwd_struct *fwd)
+{
+	ax25_dev *ax25_dev, *fwd_dev;
+
+	if ((ax25_dev = ax25_addr_ax25dev(&fwd->port_from)) == NULL)
+		return -EINVAL;
+
+	switch (cmd) {
+	case SIOCAX25ADDFWD:
+		fwd_dev = ax25_addr_ax25dev(&fwd->port_to);
+		if (!fwd_dev) {
+			ax25_dev_put(ax25_dev);
+			return -EINVAL;
+		}
+		if (ax25_dev->forward) {
+			ax25_dev_put(fwd_dev);
+			ax25_dev_put(ax25_dev);
+			return -EINVAL;
+		}
+		ax25_dev->forward = fwd_dev->dev;
+		ax25_dev_put(fwd_dev);
+		ax25_dev_put(ax25_dev);
+		break;
+
+	case SIOCAX25DELFWD:
+		if (!ax25_dev->forward) {
+			ax25_dev_put(ax25_dev);
+			return -EINVAL;
+		}
+		ax25_dev->forward = NULL;
+		ax25_dev_put(ax25_dev);
+		break;
+
+	default:
+		ax25_dev_put(ax25_dev);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+struct net_device *ax25_fwd_dev(struct net_device *dev)
+{
+	ax25_dev *ax25_dev;
+
+	if ((ax25_dev = ax25_dev_ax25dev(dev)) == NULL)
+		return dev;
+
+	if (ax25_dev->forward == NULL)
+		return dev;
+
+	return ax25_dev->forward;
+}
+
+/*
+ *	Free all memory associated with device structures.
+ */
+void __exit ax25_dev_free(void)
+{
+	ax25_dev *s, *ax25_dev;
+
+	spin_lock_bh(&ax25_dev_lock);
+	ax25_dev = ax25_dev_list;
+	while (ax25_dev != NULL) {
+		s        = ax25_dev;
+		netdev_put(ax25_dev->dev, &ax25_dev->dev_tracker);
+		ax25_dev = ax25_dev->next;
+		kfree(s);
+	}
+	ax25_dev_list = NULL;
+	spin_unlock_bh(&ax25_dev_lock);
+}