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f383ced24d
Adopt net->dev_by_index as I did in commit 0e0939c0ad
("net-procfs: use xarray iterator to implement /proc/net/dev")
Not only this removes quadratic behavior, it also makes sure
an existing vlan device is always visible in the dump,
regardless of concurrent net->dev_base_head changes.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Ido Schimmel <idosch@nvidia.com>
Link: https://lore.kernel.org/r/20240211214404.1882191-2-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
278 lines
7.4 KiB
C
278 lines
7.4 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/******************************************************************************
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* vlanproc.c VLAN Module. /proc filesystem interface.
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*
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* This module is completely hardware-independent and provides
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* access to the router using Linux /proc filesystem.
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*
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* Author: Ben Greear, <greearb@candelatech.com> coppied from wanproc.c
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* by: Gene Kozin <genek@compuserve.com>
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*
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* Copyright: (c) 1998 Ben Greear
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*
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* ============================================================================
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* Jan 20, 1998 Ben Greear Initial Version
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*****************************************************************************/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <linux/fs.h>
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#include <linux/netdevice.h>
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#include <linux/if_vlan.h>
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#include <net/net_namespace.h>
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#include <net/netns/generic.h>
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#include "vlanproc.h"
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#include "vlan.h"
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/****** Function Prototypes *************************************************/
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/* Methods for preparing data for reading proc entries */
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static int vlan_seq_show(struct seq_file *seq, void *v);
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static void *vlan_seq_start(struct seq_file *seq, loff_t *pos);
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static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos);
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static void vlan_seq_stop(struct seq_file *seq, void *);
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static int vlandev_seq_show(struct seq_file *seq, void *v);
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/*
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* Global Data
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*/
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/*
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* Names of the proc directory entries
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*/
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static const char name_root[] = "vlan";
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static const char name_conf[] = "config";
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/*
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* Structures for interfacing with the /proc filesystem.
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* VLAN creates its own directory /proc/net/vlan with the following
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* entries:
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* config device status/configuration
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* <device> entry for each device
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*/
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/*
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* Generic /proc/net/vlan/<file> file and inode operations
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*/
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static const struct seq_operations vlan_seq_ops = {
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.start = vlan_seq_start,
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.next = vlan_seq_next,
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.stop = vlan_seq_stop,
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.show = vlan_seq_show,
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};
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/*
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* Proc filesystem directory entries.
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*/
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/* Strings */
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static const char *const vlan_name_type_str[VLAN_NAME_TYPE_HIGHEST] = {
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[VLAN_NAME_TYPE_RAW_PLUS_VID] = "VLAN_NAME_TYPE_RAW_PLUS_VID",
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[VLAN_NAME_TYPE_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_PLUS_VID_NO_PAD",
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[VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD] = "VLAN_NAME_TYPE_RAW_PLUS_VID_NO_PAD",
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[VLAN_NAME_TYPE_PLUS_VID] = "VLAN_NAME_TYPE_PLUS_VID",
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};
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/*
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* Interface functions
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*/
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/*
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* Clean up /proc/net/vlan entries
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*/
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void vlan_proc_cleanup(struct net *net)
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{
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struct vlan_net *vn = net_generic(net, vlan_net_id);
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if (vn->proc_vlan_conf)
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remove_proc_entry(name_conf, vn->proc_vlan_dir);
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if (vn->proc_vlan_dir)
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remove_proc_entry(name_root, net->proc_net);
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/* Dynamically added entries should be cleaned up as their vlan_device
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* is removed, so we should not have to take care of it here...
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*/
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}
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/*
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* Create /proc/net/vlan entries
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*/
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int __net_init vlan_proc_init(struct net *net)
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{
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struct vlan_net *vn = net_generic(net, vlan_net_id);
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vn->proc_vlan_dir = proc_net_mkdir(net, name_root, net->proc_net);
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if (!vn->proc_vlan_dir)
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goto err;
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vn->proc_vlan_conf = proc_create_net(name_conf, S_IFREG | 0600,
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vn->proc_vlan_dir, &vlan_seq_ops,
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sizeof(struct seq_net_private));
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if (!vn->proc_vlan_conf)
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goto err;
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return 0;
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err:
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pr_err("can't create entry in proc filesystem!\n");
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vlan_proc_cleanup(net);
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return -ENOBUFS;
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}
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/*
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* Add directory entry for VLAN device.
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*/
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int vlan_proc_add_dev(struct net_device *vlandev)
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{
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struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
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struct vlan_net *vn = net_generic(dev_net(vlandev), vlan_net_id);
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if (!strcmp(vlandev->name, name_conf))
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return -EINVAL;
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vlan->dent = proc_create_single_data(vlandev->name, S_IFREG | 0600,
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vn->proc_vlan_dir, vlandev_seq_show, vlandev);
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if (!vlan->dent)
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return -ENOBUFS;
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return 0;
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}
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/*
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* Delete directory entry for VLAN device.
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*/
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void vlan_proc_rem_dev(struct net_device *vlandev)
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{
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/** NOTE: This will consume the memory pointed to by dent, it seems. */
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proc_remove(vlan_dev_priv(vlandev)->dent);
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vlan_dev_priv(vlandev)->dent = NULL;
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}
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/****** Proc filesystem entry points ****************************************/
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/*
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* The following few functions build the content of /proc/net/vlan/config
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*/
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static void *vlan_seq_from_index(struct seq_file *seq, loff_t *pos)
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{
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unsigned long ifindex = *pos;
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struct net_device *dev;
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for_each_netdev_dump(seq_file_net(seq), dev, ifindex) {
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if (!is_vlan_dev(dev))
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continue;
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*pos = dev->ifindex;
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return dev;
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}
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return NULL;
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}
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static void *vlan_seq_start(struct seq_file *seq, loff_t *pos)
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__acquires(rcu)
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{
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rcu_read_lock();
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if (*pos == 0)
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return SEQ_START_TOKEN;
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return vlan_seq_from_index(seq, pos);
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}
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static void *vlan_seq_next(struct seq_file *seq, void *v, loff_t *pos)
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{
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++*pos;
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return vlan_seq_from_index(seq, pos);
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}
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static void vlan_seq_stop(struct seq_file *seq, void *v)
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__releases(rcu)
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{
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rcu_read_unlock();
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}
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static int vlan_seq_show(struct seq_file *seq, void *v)
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{
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struct net *net = seq_file_net(seq);
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struct vlan_net *vn = net_generic(net, vlan_net_id);
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if (v == SEQ_START_TOKEN) {
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const char *nmtype = NULL;
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seq_puts(seq, "VLAN Dev name | VLAN ID\n");
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if (vn->name_type < ARRAY_SIZE(vlan_name_type_str))
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nmtype = vlan_name_type_str[vn->name_type];
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seq_printf(seq, "Name-Type: %s\n",
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nmtype ? nmtype : "UNKNOWN");
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} else {
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const struct net_device *vlandev = v;
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const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
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seq_printf(seq, "%-15s| %d | %s\n", vlandev->name,
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vlan->vlan_id, vlan->real_dev->name);
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}
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return 0;
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}
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static int vlandev_seq_show(struct seq_file *seq, void *offset)
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{
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struct net_device *vlandev = (struct net_device *) seq->private;
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const struct vlan_dev_priv *vlan = vlan_dev_priv(vlandev);
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struct rtnl_link_stats64 temp;
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const struct rtnl_link_stats64 *stats;
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static const char fmt64[] = "%30s %12llu\n";
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int i;
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if (!is_vlan_dev(vlandev))
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return 0;
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stats = dev_get_stats(vlandev, &temp);
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seq_printf(seq,
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"%s VID: %d REORDER_HDR: %i dev->priv_flags: %llx\n",
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vlandev->name, vlan->vlan_id,
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(int)(vlan->flags & 1), vlandev->priv_flags);
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seq_printf(seq, fmt64, "total frames received", stats->rx_packets);
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seq_printf(seq, fmt64, "total bytes received", stats->rx_bytes);
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seq_printf(seq, fmt64, "Broadcast/Multicast Rcvd", stats->multicast);
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seq_puts(seq, "\n");
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seq_printf(seq, fmt64, "total frames transmitted", stats->tx_packets);
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seq_printf(seq, fmt64, "total bytes transmitted", stats->tx_bytes);
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seq_printf(seq, "Device: %s", vlan->real_dev->name);
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/* now show all PRIORITY mappings relating to this VLAN */
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seq_printf(seq, "\nINGRESS priority mappings: "
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"0:%u 1:%u 2:%u 3:%u 4:%u 5:%u 6:%u 7:%u\n",
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vlan->ingress_priority_map[0],
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vlan->ingress_priority_map[1],
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vlan->ingress_priority_map[2],
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vlan->ingress_priority_map[3],
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vlan->ingress_priority_map[4],
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vlan->ingress_priority_map[5],
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vlan->ingress_priority_map[6],
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vlan->ingress_priority_map[7]);
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seq_printf(seq, " EGRESS priority mappings: ");
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for (i = 0; i < 16; i++) {
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const struct vlan_priority_tci_mapping *mp
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= vlan->egress_priority_map[i];
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while (mp) {
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seq_printf(seq, "%u:%d ",
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mp->priority, ((mp->vlan_qos >> 13) & 0x7));
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mp = mp->next;
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}
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}
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seq_puts(seq, "\n");
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return 0;
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}
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