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()
180 	struct net *net;  in single_open_net()  local
183 	net = get_proc_net(inode);  in single_open_net()
184 	if (!net)  in single_open_net()
187 	err = single_open(file, de->single_show, net);  in single_open_net()
189 		put_net(net);  in single_open_net()
268 static struct net *get_proc_task_net(struct inode *dir)  in get_proc_task_net()
272 	struct net *net = NULL;  in get_proc_task_net()  local
280 			net = get_net(ns->net_ns);  in get_proc_task_net()
285 	return net;  in get_proc_task_net()
292 	struct net *net;  in proc_tgid_net_lookup()  local
295 	net = get_proc_task_net(dir);  in proc_tgid_net_lookup()
296 	if (net != NULL) {  in proc_tgid_net_lookup()
297 		de = proc_lookup_de(dir, dentry, net->proc_net);  in proc_tgid_net_lookup()
298 		put_net(net);  in proc_tgid_net_lookup()
308 	struct net *net;  in proc_tgid_net_getattr()  local
310 	net = get_proc_task_net(inode);  in proc_tgid_net_getattr()
314 	if (net != NULL) {  in proc_tgid_net_getattr()
315 		stat->nlink = net->proc_net->nlink;  in proc_tgid_net_getattr()
316 		put_net(net);  in proc_tgid_net_getattr()
331 	struct net *net;  in proc_tgid_net_readdir()  local
334 	net = get_proc_task_net(file_inode(file));  in proc_tgid_net_readdir()
335 	if (net != NULL) {  in proc_tgid_net_readdir()
336 		ret = proc_readdir_de(file, ctx, net->proc_net);  in proc_tgid_net_readdir()
337 		put_net(net);  in proc_tgid_net_readdir()
348 static __net_init int proc_net_ns_init(struct net *net)  in proc_net_ns_init()  argument
356 	 * This PDE acts only as an anchor for /proc/${pid}/net hierarchy.  in proc_net_ns_init()
357 	 * Corresponding inode (PDE(inode) == net->proc_net) is never  in proc_net_ns_init()
359 	 * net->proc_net_stat inode is instantiated normally.  in proc_net_ns_init()
367 	netd->data = net;  in proc_net_ns_init()
372 	memcpy(netd->name, "net", 4);  in proc_net_ns_init()
374 	uid = make_kuid(net->user_ns, 0);  in proc_net_ns_init()
378 	gid = make_kgid(net->user_ns, 0);  in proc_net_ns_init()
384 	/* Seed dentry revalidation for /proc/${pid}/net */  in proc_net_ns_init()
388 	net_statd = proc_net_mkdir(net, "stat", netd);  in proc_net_ns_init()
392 	net->proc_net = netd;  in proc_net_ns_init()
393 	net->proc_net_stat = net_statd;  in proc_net_ns_init()
402 static __net_exit void proc_net_ns_exit(struct net *net)  in proc_net_ns_exit()  argument
404 	remove_proc_entry("stat", net->proc_net);  in proc_net_ns_exit()
405 	pde_free(net->proc_net);  in proc_net_ns_exit()
415 	proc_symlink("net", NULL, "self/net");  in proc_net_init()