atalk_proc.c revision 99b76233803beab302123d243eea9e41149804f3 
1/*
2 * 	atalk_proc.c - proc support for Appletalk
3 *
4 * 	Copyright(c) Arnaldo Carvalho de Melo <acme@conectiva.com.br>
5 *
6 *	This program is free software; you can redistribute it and/or modify it
7 *	under the terms of the GNU General Public License as published by the
8 *	Free Software Foundation, version 2.
9 */
10
11#include <linux/init.h>
12#include <linux/proc_fs.h>
13#include <linux/seq_file.h>
14#include <net/net_namespace.h>
15#include <net/sock.h>
16#include <linux/atalk.h>
17
18
19static __inline__ struct atalk_iface *atalk_get_interface_idx(loff_t pos)
20{
21	struct atalk_iface *i;
22
23	for (i = atalk_interfaces; pos && i; i = i->next)
24		--pos;
25
26	return i;
27}
28
29static void *atalk_seq_interface_start(struct seq_file *seq, loff_t *pos)
30	__acquires(atalk_interfaces_lock)
31{
32	loff_t l = *pos;
33
34	read_lock_bh(&atalk_interfaces_lock);
35	return l ? atalk_get_interface_idx(--l) : SEQ_START_TOKEN;
36}
37
38static void *atalk_seq_interface_next(struct seq_file *seq, void *v, loff_t *pos)
39{
40	struct atalk_iface *i;
41
42	++*pos;
43	if (v == SEQ_START_TOKEN) {
44		i = NULL;
45		if (atalk_interfaces)
46			i = atalk_interfaces;
47		goto out;
48	}
49	i = v;
50	i = i->next;
51out:
52	return i;
53}
54
55static void atalk_seq_interface_stop(struct seq_file *seq, void *v)
56	__releases(atalk_interfaces_lock)
57{
58	read_unlock_bh(&atalk_interfaces_lock);
59}
60
61static int atalk_seq_interface_show(struct seq_file *seq, void *v)
62{
63	struct atalk_iface *iface;
64
65	if (v == SEQ_START_TOKEN) {
66		seq_puts(seq, "Interface        Address   Networks  "
67			      "Status\n");
68		goto out;
69	}
70
71	iface = v;
72	seq_printf(seq, "%-16s %04X:%02X  %04X-%04X  %d\n",
73		   iface->dev->name, ntohs(iface->address.s_net),
74		   iface->address.s_node, ntohs(iface->nets.nr_firstnet),
75		   ntohs(iface->nets.nr_lastnet), iface->status);
76out:
77	return 0;
78}
79
80static __inline__ struct atalk_route *atalk_get_route_idx(loff_t pos)
81{
82	struct atalk_route *r;
83
84	for (r = atalk_routes; pos && r; r = r->next)
85		--pos;
86
87	return r;
88}
89
90static void *atalk_seq_route_start(struct seq_file *seq, loff_t *pos)
91	__acquires(atalk_routes_lock)
92{
93	loff_t l = *pos;
94
95	read_lock_bh(&atalk_routes_lock);
96	return l ? atalk_get_route_idx(--l) : SEQ_START_TOKEN;
97}
98
99static void *atalk_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
100{
101	struct atalk_route *r;
102
103	++*pos;
104	if (v == SEQ_START_TOKEN) {
105		r = NULL;
106		if (atalk_routes)
107			r = atalk_routes;
108		goto out;
109	}
110	r = v;
111	r = r->next;
112out:
113	return r;
114}
115
116static void atalk_seq_route_stop(struct seq_file *seq, void *v)
117	__releases(atalk_routes_lock)
118{
119	read_unlock_bh(&atalk_routes_lock);
120}
121
122static int atalk_seq_route_show(struct seq_file *seq, void *v)
123{
124	struct atalk_route *rt;
125
126	if (v == SEQ_START_TOKEN) {
127		seq_puts(seq, "Target        Router  Flags Dev\n");
128		goto out;
129	}
130
131	if (atrtr_default.dev) {
132		rt = &atrtr_default;
133		seq_printf(seq, "Default     %04X:%02X  %-4d  %s\n",
134			       ntohs(rt->gateway.s_net), rt->gateway.s_node,
135			       rt->flags, rt->dev->name);
136	}
137
138	rt = v;
139	seq_printf(seq, "%04X:%02X     %04X:%02X  %-4d  %s\n",
140		   ntohs(rt->target.s_net), rt->target.s_node,
141		   ntohs(rt->gateway.s_net), rt->gateway.s_node,
142		   rt->flags, rt->dev->name);
143out:
144	return 0;
145}
146
147static __inline__ struct sock *atalk_get_socket_idx(loff_t pos)
148{
149	struct sock *s;
150	struct hlist_node *node;
151
152	sk_for_each(s, node, &atalk_sockets)
153		if (!pos--)
154			goto found;
155	s = NULL;
156found:
157	return s;
158}
159
160static void *atalk_seq_socket_start(struct seq_file *seq, loff_t *pos)
161	__acquires(atalk_sockets_lock)
162{
163	loff_t l = *pos;
164
165	read_lock_bh(&atalk_sockets_lock);
166	return l ? atalk_get_socket_idx(--l) : SEQ_START_TOKEN;
167}
168
169static void *atalk_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
170{
171	struct sock *i;
172
173	++*pos;
174	if (v == SEQ_START_TOKEN) {
175		i = sk_head(&atalk_sockets);
176		goto out;
177	}
178	i = sk_next(v);
179out:
180	return i;
181}
182
183static void atalk_seq_socket_stop(struct seq_file *seq, void *v)
184	__releases(atalk_sockets_lock)
185{
186	read_unlock_bh(&atalk_sockets_lock);
187}
188
189static int atalk_seq_socket_show(struct seq_file *seq, void *v)
190{
191	struct sock *s;
192	struct atalk_sock *at;
193
194	if (v == SEQ_START_TOKEN) {
195		seq_printf(seq, "Type Local_addr  Remote_addr Tx_queue "
196				"Rx_queue St UID\n");
197		goto out;
198	}
199
200	s = v;
201	at = at_sk(s);
202
203	seq_printf(seq, "%02X   %04X:%02X:%02X  %04X:%02X:%02X  %08X:%08X "
204			"%02X %d\n",
205		   s->sk_type, ntohs(at->src_net), at->src_node, at->src_port,
206		   ntohs(at->dest_net), at->dest_node, at->dest_port,
207		   atomic_read(&s->sk_wmem_alloc),
208		   atomic_read(&s->sk_rmem_alloc),
209		   s->sk_state, SOCK_INODE(s->sk_socket)->i_uid);
210out:
211	return 0;
212}
213
214static const struct seq_operations atalk_seq_interface_ops = {
215	.start  = atalk_seq_interface_start,
216	.next   = atalk_seq_interface_next,
217	.stop   = atalk_seq_interface_stop,
218	.show   = atalk_seq_interface_show,
219};
220
221static const struct seq_operations atalk_seq_route_ops = {
222	.start  = atalk_seq_route_start,
223	.next   = atalk_seq_route_next,
224	.stop   = atalk_seq_route_stop,
225	.show   = atalk_seq_route_show,
226};
227
228static const struct seq_operations atalk_seq_socket_ops = {
229	.start  = atalk_seq_socket_start,
230	.next   = atalk_seq_socket_next,
231	.stop   = atalk_seq_socket_stop,
232	.show   = atalk_seq_socket_show,
233};
234
235static int atalk_seq_interface_open(struct inode *inode, struct file *file)
236{
237	return seq_open(file, &atalk_seq_interface_ops);
238}
239
240static int atalk_seq_route_open(struct inode *inode, struct file *file)
241{
242	return seq_open(file, &atalk_seq_route_ops);
243}
244
245static int atalk_seq_socket_open(struct inode *inode, struct file *file)
246{
247	return seq_open(file, &atalk_seq_socket_ops);
248}
249
250static const struct file_operations atalk_seq_interface_fops = {
251	.owner		= THIS_MODULE,
252	.open		= atalk_seq_interface_open,
253	.read		= seq_read,
254	.llseek		= seq_lseek,
255	.release	= seq_release,
256};
257
258static const struct file_operations atalk_seq_route_fops = {
259	.owner		= THIS_MODULE,
260	.open		= atalk_seq_route_open,
261	.read		= seq_read,
262	.llseek		= seq_lseek,
263	.release	= seq_release,
264};
265
266static const struct file_operations atalk_seq_socket_fops = {
267	.owner		= THIS_MODULE,
268	.open		= atalk_seq_socket_open,
269	.read		= seq_read,
270	.llseek		= seq_lseek,
271	.release	= seq_release,
272};
273
274static struct proc_dir_entry *atalk_proc_dir;
275
276int __init atalk_proc_init(void)
277{
278	struct proc_dir_entry *p;
279	int rc = -ENOMEM;
280
281	atalk_proc_dir = proc_mkdir("atalk", init_net.proc_net);
282	if (!atalk_proc_dir)
283		goto out;
284
285	p = proc_create("interface", S_IRUGO, atalk_proc_dir,
286			&atalk_seq_interface_fops);
287	if (!p)
288		goto out_interface;
289
290	p = proc_create("route", S_IRUGO, atalk_proc_dir,
291			&atalk_seq_route_fops);
292	if (!p)
293		goto out_route;
294
295	p = proc_create("socket", S_IRUGO, atalk_proc_dir,
296			&atalk_seq_socket_fops);
297	if (!p)
298		goto out_socket;
299
300	p = proc_create("arp", S_IRUGO, atalk_proc_dir, &atalk_seq_arp_fops);
301	if (!p)
302		goto out_arp;
303
304	rc = 0;
305out:
306	return rc;
307out_arp:
308	remove_proc_entry("socket", atalk_proc_dir);
309out_socket:
310	remove_proc_entry("route", atalk_proc_dir);
311out_route:
312	remove_proc_entry("interface", atalk_proc_dir);
313out_interface:
314	remove_proc_entry("atalk", init_net.proc_net);
315	goto out;
316}
317
318void __exit atalk_proc_exit(void)
319{
320	remove_proc_entry("interface", atalk_proc_dir);
321	remove_proc_entry("route", atalk_proc_dir);
322	remove_proc_entry("socket", atalk_proc_dir);
323	remove_proc_entry("arp", atalk_proc_dir);
324	remove_proc_entry("atalk", init_net.proc_net);
325}
326