3  *  linux/fs/proc/net.c
9  *  proc net directory handling functions
24 #include <net/net_namespace.h>
29 static inline struct net *PDE_NET(struct proc_dir_entry *pde)  in PDE_NET()
34 static struct net *get_proc_net(const struct inode *inode)  in get_proc_net()
43 	struct net *net;  in seq_open_net()  local
50 	net = get_proc_net(inode);  in seq_open_net()
51 	if (!net)  in seq_open_net()
56 		put_net(net);  in seq_open_net()
60 	p->net = net;  in seq_open_net()
61 	netns_tracker_alloc(net, &p->ns_tracker, GFP_KERNEL);  in seq_open_net()
71 	put_net_track(priv->net, &priv->ns_tracker);  in seq_file_net_put_net()
99 	p->net = get_net_track(current->nsproxy->net_ns, &p->ns_tracker,  in bpf_iter_init_seq_net()
110 	put_net_track(p->net, &p->ns_tracker);  in bpf_iter_fini_seq_net()
179 	struct net *net;  in single_open_net()  local
182 	net = get_proc_net(inode);  in single_open_net()
183 	if (!net)  in single_open_net()
186 	err = single_open(file, de->single_show, net);  in single_open_net()
188 		put_net(net);  in single_open_net()
267 static struct net *get_proc_task_net(struct inode *dir)  in get_proc_task_net()
271 	struct net *net = NULL;  in get_proc_task_net()  local
279 			net = get_net(ns->net_ns);  in get_proc_task_net()
284 	return net;  in get_proc_task_net()
291 	struct net *net;  in proc_tgid_net_lookup()  local
294 	net = get_proc_task_net(dir);  in proc_tgid_net_lookup()
295 	if (net != NULL) {  in proc_tgid_net_lookup()
296 		de = proc_lookup_de(dir, dentry, net->proc_net);  in proc_tgid_net_lookup()
297 		put_net(net);  in proc_tgid_net_lookup()
307 	struct net *net;  in proc_tgid_net_getattr()  local
309 	net = get_proc_task_net(inode);  in proc_tgid_net_getattr()
313 	if (net != NULL) {  in proc_tgid_net_getattr()
314 		stat->nlink = net->proc_net->nlink;  in proc_tgid_net_getattr()
315 		put_net(net);  in proc_tgid_net_getattr()
330 	struct net *net;  in proc_tgid_net_readdir()  local
333 	net = get_proc_task_net(file_inode(file));  in proc_tgid_net_readdir()
334 	if (net != NULL) {  in proc_tgid_net_readdir()
335 		ret = proc_readdir_de(file, ctx, net->proc_net);  in proc_tgid_net_readdir()
336 		put_net(net);  in proc_tgid_net_readdir()
347 static __net_init int proc_net_ns_init(struct net *net)  in proc_net_ns_init()  argument
355 	 * This PDE acts only as an anchor for /proc/${pid}/net hierarchy.  in proc_net_ns_init()
356 	 * Corresponding inode (PDE(inode) == net->proc_net) is never  in proc_net_ns_init()
358 	 * net->proc_net_stat inode is instantiated normally.  in proc_net_ns_init()
366 	netd->data = net;  in proc_net_ns_init()
371 	memcpy(netd->name, "net", 4);  in proc_net_ns_init()
373 	uid = make_kuid(net->user_ns, 0);  in proc_net_ns_init()
377 	gid = make_kgid(net->user_ns, 0);  in proc_net_ns_init()
383 	/* Seed dentry revalidation for /proc/${pid}/net */  in proc_net_ns_init()
387 	net_statd = proc_net_mkdir(net, "stat", netd);  in proc_net_ns_init()
391 	net->proc_net = netd;  in proc_net_ns_init()
392 	net->proc_net_stat = net_statd;  in proc_net_ns_init()
401 static __net_exit void proc_net_ns_exit(struct net *net)  in proc_net_ns_exit()  argument
403 	remove_proc_entry("stat", net->proc_net);  in proc_net_ns_exit()
404 	pde_free(net->proc_net);  in proc_net_ns_exit()
414 	proc_symlink("net", NULL, "self/net");  in proc_net_init()