1 files changed, 291 insertions, 0 deletions
diff --git a/net/8021q/vlanproc.c b/net/8021q/vlanproc.c
new file mode 100644
index 0000000000..7825c12974
--- /dev/null
+++ b/net/8021q/vlanproc.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/******************************************************************************
+ * vlanproc.c	VLAN Module. /proc filesystem interface.
+ *
+ *		This module is completely hardware-independent and provides
+ *		access to the router using Linux /proc filesystem.
+ *
+ * Author:	Ben Greear, <greearb@candelatech.com> coppied from wanproc.c
+ *               by: Gene Kozin	<genek@compuserve.com>
+ *
+ * Copyright:	(c) 1998 Ben Greear
+ *
+ * ============================================================================
+ * Jan 20, 1998        Ben Greear     Initial Version
+ *****************************************************************************/
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/fs.h>
+#include <linux/netdevice.h>
+#include <linux/if_vlan.h>
+#include <net/net_namespace.h>
+#include <net/netns/generic.h>
+#include "vlanproc.h"
+#include "vlan.h"
+
+/****** Function Prototypes *************************************************/
+
+/* Methods for preparing data for reading proc entries */
+static int vlan_seq_show(struct seq_file *seq, void *v);
+static void *vlan_seq_start(struct seq_file *seq, loff_t *pos);
+static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos);
+static void vlan_seq_stop(struct seq_file *seq, void *);
+static int vlandev_seq_show(struct seq_file *seq, void *v);
+
+/*
+ *	Global Data
+ */
+
+
+/*
+ *	Names of the proc directory entries
+ */
+
+static const char name_root[]	 = "vlan";
+static const char name_conf[]	 = "config";
+
+/*
+ *	Structures for interfacing with the /proc filesystem.
+ *	VLAN creates its own directory /proc/net/vlan with the following
+ *	entries:
+ *	config		device status/configuration
+ *	<device>	entry for each  device
+ */
+
+/*
+ *	Generic /proc/net/vlan/<file> file and inode operations
+ */
+
+static const struct seq_operations vlan_seq_ops = {
+	.start = vlan_seq_start,
+	.next = vlan_seq_next,
+	.stop = vlan_seq_stop,
+	.show = vlan_seq_show,
+};
+
+/*
+ * Proc filesystem directory entries.
+ */
+
+/* Strings */
+static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = {
+    [VLAN_NAME_TYPE_RAW_PLUS_VID]        = "VLAN_NAME_TYPE_RAW_PLUS_VID",
+    [VLAN_NAME_TYPE_PLUS_VID_NO_PAD]	 = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD",
+    [VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD",
+    [VLAN_NAME_TYPE_PLUS_VID]		 = "VLAN_NAME_TYPE_PLUS_VID",
+};
+/*
+ *	Interface functions
+ */
+
+/*
+ *	Clean up /proc/net/vlan entries
+ */
+
+void vlan_proc_cleanup(struct net *net)
+{
+	struct vlan_net *vn = net_generic(net, vlan_net_id);
+
+	if (vn->proc_vlan_conf)
+		remove_proc_entry(name_conf, vn->proc_vlan_dir);
+
+	if (vn->proc_vlan_dir)
+		remove_proc_entry(name_root, net->proc_net);
+
+	/* Dynamically added entries should be cleaned up as their vlan_device
+	 * is removed, so we should not have to take care of it here...
+	 */
+}
+
+/*
+ *	Create /proc/net/vlan entries
+ */
+
+int __net_init vlan_proc_init(struct net *net)
+{
+	struct vlan_net *vn = net_generic(net, vlan_net_id);
+
+	vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
+	if (!vn->proc_vlan_dir)
+		goto err;
+
+	vn->proc_vlan_conf = proc_create_net(name_conf, S_IFREG | 0600,
+			vn->proc_vlan_dir, &vlan_seq_ops,
+			sizeof(struct seq_net_private));
+	if (!vn->proc_vlan_conf)
+		goto err;
+	return 0;
+
+err:
+	pr_err("can't create entry in proc filesystem!\n");
+	vlan_proc_cleanup(net);
+	return -ENOBUFS;
+}
+
+/*
+ *	Add directory entry for VLAN device.
+ */
+
+int vlan_proc_add_dev(struct net_device *vlandev)
+{
+	struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
+	struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
+
+	if (!strcmp(vlandev->name, name_conf))
+		return -EINVAL;
+	vlan->dent = proc_create_single_data(vlandev->name, S_IFREG | 0600,
+			vn->proc_vlan_dir, vlandev_seq_show, vlandev);
+	if (!vlan->dent)
+		return -ENOBUFS;
+	return 0;
+}
+
+/*
+ *	Delete directory entry for VLAN device.
+ */
+void vlan_proc_rem_dev(struct net_device *vlandev)
+{
+	/** NOTE:  This will consume the memory pointed to by dent, it seems. */
+	proc_remove(vlan_dev_priv(vlandev)->dent);
+	vlan_dev_priv(vlandev)->dent = NULL;
+}
+
+/****** Proc filesystem entry points ****************************************/
+
+/*
+ * The following few functions build the content of /proc/net/vlan/config
+ */
+
+/* start read of /proc/net/vlan/config */
+static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)
+	__acquires(rcu)
+{
+	struct net_device *dev;
+	struct net *net = seq_file_net(seq);
+	loff_t i = 1;
+
+	rcu_read_lock();
+	if (*pos == 0)
+		return SEQ_START_TOKEN;
+
+	for_each_netdev_rcu(net, dev) {
+		if (!is_vlan_dev(dev))
+			continue;
+
+		if (i++ == *pos)
+			return dev;
+	}
+
+	return  NULL;
+}
+
+static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+	struct net_device *dev;
+	struct net *net = seq_file_net(seq);
+
+	++*pos;
+
+	dev = v;
+	if (v == SEQ_START_TOKEN)
+		dev = net_device_entry(&net->dev_base_head);
+
+	for_each_netdev_continue_rcu(net, dev) {
+		if (!is_vlan_dev(dev))
+			continue;
+
+		return dev;
+	}
+
+	return NULL;
+}
+
+static void vlan_seq_stop(struct seq_file *seq, void *v)
+	__releases(rcu)
+{
+	rcu_read_unlock();
+}
+
+static int vlan_seq_show(struct seq_file *seq, void *v)
+{
+	struct net *net = seq_file_net(seq);
+	struct vlan_net *vn = net_generic(net, vlan_net_id);
+
+	if (v == SEQ_START_TOKEN) {
+		const char *nmtype = NULL;
+
+		seq_puts(seq, "VLAN Dev name	 | VLAN ID\n");
+
+		if (vn->name_type < ARRAY_SIZE(vlan_name_type_str))
+		    nmtype =  vlan_name_type_str[vn->name_type];
+
+		seq_printf(seq, "Name-Type: %s\n",
+			   nmtype ? nmtype :  "UNKNOWN");
+	} else {
+		const struct net_device *vlandev = v;
+		const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
+
+		seq_printf(seq, "%-15s| %d  | %s\n",  vlandev->name,
+			   vlan->vlan_id,    vlan->real_dev->name);
+	}
+	return 0;
+}
+
+static int vlandev_seq_show(struct seq_file *seq, void *offset)
+{
+	struct net_device *vlandev = (struct net_device *) seq->private;
+	const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
+	struct rtnl_link_stats64 temp;
+	const struct rtnl_link_stats64 *stats;
+	static const char fmt64[] = "%30s %12llu\n";
+	int i;
+
+	if (!is_vlan_dev(vlandev))
+		return 0;
+
+	stats = dev_get_stats(vlandev, &temp);
+	seq_printf(seq,
+		   "%s  VID: %d	 REORDER_HDR: %i  dev->priv_flags: %llx\n",
+		   vlandev->name, vlan->vlan_id,
+		   (int)(vlan->flags & 1), vlandev->priv_flags);
+
+	seq_printf(seq, fmt64, "total frames received", stats->rx_packets);
+	seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes);
+	seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast);
+	seq_puts(seq, "\n");
+	seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets);
+	seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes);
+	seq_printf(seq, "Device: %s", vlan->real_dev->name);
+	/* now show all PRIORITY mappings relating to this VLAN */
+	seq_printf(seq, "\nINGRESS priority mappings: "
+			"0:%u  1:%u  2:%u  3:%u  4:%u  5:%u  6:%u 7:%u\n",
+		   vlan->ingress_priority_map[0],
+		   vlan->ingress_priority_map[1],
+		   vlan->ingress_priority_map[2],
+		   vlan->ingress_priority_map[3],
+		   vlan->ingress_priority_map[4],
+		   vlan->ingress_priority_map[5],
+		   vlan->ingress_priority_map[6],
+		   vlan->ingress_priority_map[7]);
+
+	seq_printf(seq, " EGRESS priority mappings: ");
+	for (i = 0; i < 16; i++) {
+		const struct vlan_priority_tci_mapping *mp
+			= vlan->egress_priority_map[i];
+		while (mp) {
+			seq_printf(seq, "%u:%d ",
+				   mp->priority, ((mp->vlan_qos >> 13) & 0x7));
+			mp = mp->next;
+		}
+	}
+	seq_puts(seq, "\n");
+
+	return 0;
+}