/* * linux/fs/proc/net.c * * Copyright (C) 2007 * * Author: Eric Biederman <ebiederm@xmission.com> * * proc net directory handling functions */ #include <asm/uaccess.h> #include <linux/errno.h> #include <linux/time.h> #include <linux/proc_fs.h> #include <linux/stat.h> #include <linux/init.h> #include <linux/sched.h> #include <linux/module.h> #include <linux/bitops.h> #include <linux/smp_lock.h> #include <linux/mount.h> #include <linux/nsproxy.h> #include <net/net_namespace.h> #include <linux/seq_file.h> #include "internal.h" int seq_open_net(struct inode *ino, struct file *f, const struct seq_operations *ops, int size) { struct net *net; struct seq_net_private *p; BUG_ON(size < sizeof(*p)); net = get_proc_net(ino); if (net == NULL) return -ENXIO; p = __seq_open_private(f, ops, size); if (p == NULL) { put_net(net); return -ENOMEM; } p->net = net; return 0; } EXPORT_SYMBOL_GPL(seq_open_net); int seq_release_net(struct inode *ino, struct file *f) { struct seq_file *seq; struct seq_net_private *p; seq = f->private_data; p = seq->private; put_net(p->net); seq_release_private(ino, f); return 0; } EXPORT_SYMBOL_GPL(seq_release_net); struct proc_dir_entry *proc_net_fops_create(struct net *net, const char *name, mode_t mode, const struct file_operations *fops) { struct proc_dir_entry *res; res = create_proc_entry(name, mode, net->proc_net); if (res) res->proc_fops = fops; return res; } EXPORT_SYMBOL_GPL(proc_net_fops_create); void proc_net_remove(struct net *net, const char *name) { remove_proc_entry(name, net->proc_net); } EXPORT_SYMBOL_GPL(proc_net_remove); struct net *get_proc_net(const struct inode *inode) { return maybe_get_net(PDE_NET(PDE(inode))); } EXPORT_SYMBOL_GPL(get_proc_net); static struct proc_dir_entry *shadow_pde; static struct proc_dir_entry *proc_net_shadow(struct task_struct *task, struct proc_dir_entry *de) { return task->nsproxy->net_ns->proc_net; } struct proc_dir_entry *proc_net_mkdir(struct net *net, const char *name, struct proc_dir_entry *parent) { struct proc_dir_entry *pde; pde = proc_mkdir_mode(name, S_IRUGO | S_IXUGO, parent); if (pde != NULL) pde->data = net; return pde; } EXPORT_SYMBOL_GPL(proc_net_mkdir); static __net_init int proc_net_ns_init(struct net *net) { struct proc_dir_entry *root, *netd, *net_statd; int err; err = -ENOMEM; root = kzalloc(sizeof(*root), GFP_KERNEL); if (!root) goto out; err = -EEXIST; netd = proc_net_mkdir(net, "net", root); if (!netd) goto free_root; err = -EEXIST; net_statd = proc_net_mkdir(net, "stat", netd); if (!net_statd) goto free_net; root->data = net; net->proc_net_root = root; net->proc_net = netd; net->proc_net_stat = net_statd; err = 0; out: return err; free_net: remove_proc_entry("net", root); free_root: kfree(root); goto out; } static __net_exit void proc_net_ns_exit(struct net *net) { remove_proc_entry("stat", net->proc_net); remove_proc_entry("net", net->proc_net_root); kfree(net->proc_net_root); } static struct pernet_operations __net_initdata proc_net_ns_ops = { .init = proc_net_ns_init, .exit = proc_net_ns_exit, }; int __init proc_net_init(void) { shadow_pde = proc_mkdir("net", NULL); shadow_pde->shadow_proc = proc_net_shadow; return register_pernet_subsys(&proc_net_ns_ops); }