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![Muchun Song](/assets/img/avatar_default.png)
Remove PDE_DATA() completely and replace it with pde_data(). [akpm@linux-foundation.org: fix naming clash in drivers/nubus/proc.c] [akpm@linux-foundation.org: now fix it properly] Link: https://lkml.kernel.org/r/20211124081956.87711-2-songmuchun@bytedance.com Signed-off-by: Muchun Song <songmuchun@bytedance.com> Acked-by: Christian Brauner <christian.brauner@ubuntu.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Alexey Gladkov <gladkov.alexey@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
410 lines
10 KiB
C
410 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* linux/fs/proc/net.c
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*
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* Copyright (C) 2007
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*
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* Author: Eric Biederman <ebiederm@xmission.com>
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*
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* proc net directory handling functions
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*/
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#include <linux/uaccess.h>
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#include <linux/errno.h>
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#include <linux/time.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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#include <linux/slab.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/sched/task.h>
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#include <linux/module.h>
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#include <linux/bitops.h>
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#include <linux/mount.h>
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#include <linux/nsproxy.h>
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#include <linux/uidgid.h>
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#include <net/net_namespace.h>
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#include <linux/seq_file.h>
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#include "internal.h"
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static inline struct net *PDE_NET(struct proc_dir_entry *pde)
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{
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return pde->parent->data;
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}
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static struct net *get_proc_net(const struct inode *inode)
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{
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return maybe_get_net(PDE_NET(PDE(inode)));
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}
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static int seq_open_net(struct inode *inode, struct file *file)
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{
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unsigned int state_size = PDE(inode)->state_size;
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struct seq_net_private *p;
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struct net *net;
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WARN_ON_ONCE(state_size < sizeof(*p));
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if (file->f_mode & FMODE_WRITE && !PDE(inode)->write)
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return -EACCES;
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net = get_proc_net(inode);
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if (!net)
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return -ENXIO;
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p = __seq_open_private(file, PDE(inode)->seq_ops, state_size);
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if (!p) {
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put_net(net);
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return -ENOMEM;
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}
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#ifdef CONFIG_NET_NS
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p->net = net;
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netns_tracker_alloc(net, &p->ns_tracker, GFP_KERNEL);
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#endif
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return 0;
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}
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static void seq_file_net_put_net(struct seq_file *seq)
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{
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#ifdef CONFIG_NET_NS
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struct seq_net_private *priv = seq->private;
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put_net_track(priv->net, &priv->ns_tracker);
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#else
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put_net(&init_net);
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#endif
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}
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static int seq_release_net(struct inode *ino, struct file *f)
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{
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struct seq_file *seq = f->private_data;
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seq_file_net_put_net(seq);
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seq_release_private(ino, f);
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return 0;
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}
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static const struct proc_ops proc_net_seq_ops = {
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.proc_open = seq_open_net,
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.proc_read = seq_read,
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.proc_write = proc_simple_write,
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.proc_lseek = seq_lseek,
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.proc_release = seq_release_net,
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};
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int bpf_iter_init_seq_net(void *priv_data, struct bpf_iter_aux_info *aux)
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{
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#ifdef CONFIG_NET_NS
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struct seq_net_private *p = priv_data;
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p->net = get_net_track(current->nsproxy->net_ns, &p->ns_tracker,
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GFP_KERNEL);
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#endif
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return 0;
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}
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void bpf_iter_fini_seq_net(void *priv_data)
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{
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#ifdef CONFIG_NET_NS
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struct seq_net_private *p = priv_data;
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put_net_track(p->net, &p->ns_tracker);
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#endif
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}
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struct proc_dir_entry *proc_create_net_data(const char *name, umode_t mode,
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struct proc_dir_entry *parent, const struct seq_operations *ops,
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unsigned int state_size, void *data)
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{
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struct proc_dir_entry *p;
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p = proc_create_reg(name, mode, &parent, data);
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if (!p)
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return NULL;
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pde_force_lookup(p);
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p->proc_ops = &proc_net_seq_ops;
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p->seq_ops = ops;
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p->state_size = state_size;
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return proc_register(parent, p);
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}
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EXPORT_SYMBOL_GPL(proc_create_net_data);
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/**
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* proc_create_net_data_write - Create a writable net_ns-specific proc file
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* @name: The name of the file.
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* @mode: The file's access mode.
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* @parent: The parent directory in which to create.
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* @ops: The seq_file ops with which to read the file.
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* @write: The write method with which to 'modify' the file.
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* @data: Data for retrieval by pde_data().
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*
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* Create a network namespaced proc file in the @parent directory with the
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* specified @name and @mode that allows reading of a file that displays a
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* series of elements and also provides for the file accepting writes that have
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* some arbitrary effect.
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*
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* The functions in the @ops table are used to iterate over items to be
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* presented and extract the readable content using the seq_file interface.
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*
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* The @write function is called with the data copied into a kernel space
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* scratch buffer and has a NUL appended for convenience. The buffer may be
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* modified by the @write function. @write should return 0 on success.
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*
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* The @data value is accessible from the @show and @write functions by calling
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* pde_data() on the file inode. The network namespace must be accessed by
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* calling seq_file_net() on the seq_file struct.
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*/
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struct proc_dir_entry *proc_create_net_data_write(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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const struct seq_operations *ops,
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proc_write_t write,
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unsigned int state_size, void *data)
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{
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struct proc_dir_entry *p;
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p = proc_create_reg(name, mode, &parent, data);
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if (!p)
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return NULL;
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pde_force_lookup(p);
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p->proc_ops = &proc_net_seq_ops;
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p->seq_ops = ops;
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p->state_size = state_size;
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p->write = write;
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return proc_register(parent, p);
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}
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EXPORT_SYMBOL_GPL(proc_create_net_data_write);
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static int single_open_net(struct inode *inode, struct file *file)
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{
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struct proc_dir_entry *de = PDE(inode);
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struct net *net;
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int err;
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net = get_proc_net(inode);
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if (!net)
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return -ENXIO;
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err = single_open(file, de->single_show, net);
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if (err)
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put_net(net);
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return err;
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}
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static int single_release_net(struct inode *ino, struct file *f)
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{
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struct seq_file *seq = f->private_data;
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put_net(seq->private);
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return single_release(ino, f);
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}
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static const struct proc_ops proc_net_single_ops = {
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.proc_open = single_open_net,
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.proc_read = seq_read,
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.proc_write = proc_simple_write,
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.proc_lseek = seq_lseek,
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.proc_release = single_release_net,
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};
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struct proc_dir_entry *proc_create_net_single(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *), void *data)
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{
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struct proc_dir_entry *p;
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p = proc_create_reg(name, mode, &parent, data);
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if (!p)
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return NULL;
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pde_force_lookup(p);
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p->proc_ops = &proc_net_single_ops;
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p->single_show = show;
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return proc_register(parent, p);
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}
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EXPORT_SYMBOL_GPL(proc_create_net_single);
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/**
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* proc_create_net_single_write - Create a writable net_ns-specific proc file
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* @name: The name of the file.
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* @mode: The file's access mode.
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* @parent: The parent directory in which to create.
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* @show: The seqfile show method with which to read the file.
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* @write: The write method with which to 'modify' the file.
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* @data: Data for retrieval by pde_data().
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*
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* Create a network-namespaced proc file in the @parent directory with the
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* specified @name and @mode that allows reading of a file that displays a
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* single element rather than a series and also provides for the file accepting
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* writes that have some arbitrary effect.
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*
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* The @show function is called to extract the readable content via the
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* seq_file interface.
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*
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* The @write function is called with the data copied into a kernel space
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* scratch buffer and has a NUL appended for convenience. The buffer may be
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* modified by the @write function. @write should return 0 on success.
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*
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* The @data value is accessible from the @show and @write functions by calling
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* pde_data() on the file inode. The network namespace must be accessed by
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* calling seq_file_single_net() on the seq_file struct.
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*/
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struct proc_dir_entry *proc_create_net_single_write(const char *name, umode_t mode,
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struct proc_dir_entry *parent,
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int (*show)(struct seq_file *, void *),
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proc_write_t write,
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void *data)
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{
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struct proc_dir_entry *p;
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p = proc_create_reg(name, mode, &parent, data);
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if (!p)
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return NULL;
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pde_force_lookup(p);
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p->proc_ops = &proc_net_single_ops;
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p->single_show = show;
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p->write = write;
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return proc_register(parent, p);
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}
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EXPORT_SYMBOL_GPL(proc_create_net_single_write);
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static struct net *get_proc_task_net(struct inode *dir)
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{
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struct task_struct *task;
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struct nsproxy *ns;
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struct net *net = NULL;
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rcu_read_lock();
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task = pid_task(proc_pid(dir), PIDTYPE_PID);
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if (task != NULL) {
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task_lock(task);
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ns = task->nsproxy;
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if (ns != NULL)
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net = get_net(ns->net_ns);
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task_unlock(task);
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}
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rcu_read_unlock();
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return net;
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}
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static struct dentry *proc_tgid_net_lookup(struct inode *dir,
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struct dentry *dentry, unsigned int flags)
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{
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struct dentry *de;
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struct net *net;
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de = ERR_PTR(-ENOENT);
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net = get_proc_task_net(dir);
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if (net != NULL) {
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de = proc_lookup_de(dir, dentry, net->proc_net);
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put_net(net);
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}
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return de;
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}
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static int proc_tgid_net_getattr(struct user_namespace *mnt_userns,
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const struct path *path, struct kstat *stat,
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u32 request_mask, unsigned int query_flags)
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{
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struct inode *inode = d_inode(path->dentry);
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struct net *net;
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net = get_proc_task_net(inode);
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generic_fillattr(&init_user_ns, inode, stat);
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if (net != NULL) {
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stat->nlink = net->proc_net->nlink;
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put_net(net);
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}
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return 0;
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}
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const struct inode_operations proc_net_inode_operations = {
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.lookup = proc_tgid_net_lookup,
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.getattr = proc_tgid_net_getattr,
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};
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static int proc_tgid_net_readdir(struct file *file, struct dir_context *ctx)
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{
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int ret;
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struct net *net;
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ret = -EINVAL;
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net = get_proc_task_net(file_inode(file));
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if (net != NULL) {
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ret = proc_readdir_de(file, ctx, net->proc_net);
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put_net(net);
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}
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return ret;
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}
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const struct file_operations proc_net_operations = {
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.llseek = generic_file_llseek,
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.read = generic_read_dir,
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.iterate_shared = proc_tgid_net_readdir,
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};
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static __net_init int proc_net_ns_init(struct net *net)
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{
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struct proc_dir_entry *netd, *net_statd;
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kuid_t uid;
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kgid_t gid;
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int err;
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err = -ENOMEM;
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netd = kmem_cache_zalloc(proc_dir_entry_cache, GFP_KERNEL);
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if (!netd)
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goto out;
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netd->subdir = RB_ROOT;
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netd->data = net;
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netd->nlink = 2;
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netd->namelen = 3;
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netd->parent = &proc_root;
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netd->name = netd->inline_name;
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memcpy(netd->name, "net", 4);
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uid = make_kuid(net->user_ns, 0);
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if (!uid_valid(uid))
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uid = netd->uid;
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gid = make_kgid(net->user_ns, 0);
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if (!gid_valid(gid))
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gid = netd->gid;
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proc_set_user(netd, uid, gid);
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err = -EEXIST;
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net_statd = proc_net_mkdir(net, "stat", netd);
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if (!net_statd)
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goto free_net;
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net->proc_net = netd;
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net->proc_net_stat = net_statd;
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return 0;
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free_net:
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pde_free(netd);
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out:
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return err;
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}
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static __net_exit void proc_net_ns_exit(struct net *net)
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{
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remove_proc_entry("stat", net->proc_net);
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pde_free(net->proc_net);
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}
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static struct pernet_operations __net_initdata proc_net_ns_ops = {
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.init = proc_net_ns_init,
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.exit = proc_net_ns_exit,
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};
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int __init proc_net_init(void)
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{
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proc_symlink("net", NULL, "self/net");
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return register_pernet_subsys(&proc_net_ns_ops);
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}
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