1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *	X.25 Packet Layer release 002
4 *
5 *	This is ALPHA test software. This code may break your machine,
6 *	randomly fail to work with new releases, misbehave and/or generally
7 *	screw up. It might even work.
8 *
9 *	This code REQUIRES 2.4 with seq_file support
10 *
11 *	History
12 *	2002/10/06	Arnaldo Carvalho de Melo  seq_file support
13 */
14
15#include <linux/init.h>
16#include <linux/proc_fs.h>
17#include <linux/seq_file.h>
18#include <linux/export.h>
19#include <net/net_namespace.h>
20#include <net/sock.h>
21#include <net/x25.h>
22
23#ifdef CONFIG_PROC_FS
24
25static void *x25_seq_route_start(struct seq_file *seq, loff_t *pos)
26	__acquires(x25_route_list_lock)
27{
28	read_lock_bh(&x25_route_list_lock);
29	return seq_list_start_head(&x25_route_list, *pos);
30}
31
32static void *x25_seq_route_next(struct seq_file *seq, void *v, loff_t *pos)
33{
34	return seq_list_next(v, &x25_route_list, pos);
35}
36
37static void x25_seq_route_stop(struct seq_file *seq, void *v)
38	__releases(x25_route_list_lock)
39{
40	read_unlock_bh(&x25_route_list_lock);
41}
42
43static int x25_seq_route_show(struct seq_file *seq, void *v)
44{
45	struct x25_route *rt = list_entry(v, struct x25_route, node);
46
47	if (v == &x25_route_list) {
48		seq_puts(seq, "Address          Digits  Device\n");
49		goto out;
50	}
51
52	rt = v;
53	seq_printf(seq, "%-15s  %-6d  %-5s\n",
54		   rt->address.x25_addr, rt->sigdigits,
55		   rt->dev ? rt->dev->name : "???");
56out:
57	return 0;
58}
59
60static void *x25_seq_socket_start(struct seq_file *seq, loff_t *pos)
61	__acquires(x25_list_lock)
62{
63	read_lock_bh(&x25_list_lock);
64	return seq_hlist_start_head(&x25_list, *pos);
65}
66
67static void *x25_seq_socket_next(struct seq_file *seq, void *v, loff_t *pos)
68{
69	return seq_hlist_next(v, &x25_list, pos);
70}
71
72static void x25_seq_socket_stop(struct seq_file *seq, void *v)
73	__releases(x25_list_lock)
74{
75	read_unlock_bh(&x25_list_lock);
76}
77
78static int x25_seq_socket_show(struct seq_file *seq, void *v)
79{
80	struct sock *s;
81	struct x25_sock *x25;
82	const char *devname;
83
84	if (v == SEQ_START_TOKEN) {
85		seq_printf(seq, "dest_addr  src_addr   dev   lci st vs vr "
86				"va   t  t2 t21 t22 t23 Snd-Q Rcv-Q inode\n");
87		goto out;
88	}
89
90	s = sk_entry(v);
91	x25 = x25_sk(s);
92
93	if (!x25->neighbour || !x25->neighbour->dev)
94		devname = "???";
95	else
96		devname = x25->neighbour->dev->name;
97
98	seq_printf(seq, "%-10s %-10s %-5s %3.3X  %d  %d  %d  %d %3lu %3lu "
99			"%3lu %3lu %3lu %5d %5d %ld\n",
100		   !x25->dest_addr.x25_addr[0] ? "*" : x25->dest_addr.x25_addr,
101		   !x25->source_addr.x25_addr[0] ? "*" : x25->source_addr.x25_addr,
102		   devname, x25->lci & 0x0FFF, x25->state, x25->vs, x25->vr,
103		   x25->va, x25_display_timer(s) / HZ, x25->t2  / HZ,
104		   x25->t21 / HZ, x25->t22 / HZ, x25->t23 / HZ,
105		   sk_wmem_alloc_get(s),
106		   sk_rmem_alloc_get(s),
107		   s->sk_socket ? SOCK_INODE(s->sk_socket)->i_ino : 0L);
108out:
109	return 0;
110}
111
112static void *x25_seq_forward_start(struct seq_file *seq, loff_t *pos)
113	__acquires(x25_forward_list_lock)
114{
115	read_lock_bh(&x25_forward_list_lock);
116	return seq_list_start_head(&x25_forward_list, *pos);
117}
118
119static void *x25_seq_forward_next(struct seq_file *seq, void *v, loff_t *pos)
120{
121	return seq_list_next(v, &x25_forward_list, pos);
122}
123
124static void x25_seq_forward_stop(struct seq_file *seq, void *v)
125	__releases(x25_forward_list_lock)
126{
127	read_unlock_bh(&x25_forward_list_lock);
128}
129
130static int x25_seq_forward_show(struct seq_file *seq, void *v)
131{
132	struct x25_forward *f = list_entry(v, struct x25_forward, node);
133
134	if (v == &x25_forward_list) {
135		seq_printf(seq, "lci dev1       dev2\n");
136		goto out;
137	}
138
139	f = v;
140
141	seq_printf(seq, "%d %-10s %-10s\n",
142			f->lci, f->dev1->name, f->dev2->name);
143out:
144	return 0;
145}
146
147static const struct seq_operations x25_seq_route_ops = {
148	.start  = x25_seq_route_start,
149	.next   = x25_seq_route_next,
150	.stop   = x25_seq_route_stop,
151	.show   = x25_seq_route_show,
152};
153
154static const struct seq_operations x25_seq_socket_ops = {
155	.start  = x25_seq_socket_start,
156	.next   = x25_seq_socket_next,
157	.stop   = x25_seq_socket_stop,
158	.show   = x25_seq_socket_show,
159};
160
161static const struct seq_operations x25_seq_forward_ops = {
162	.start  = x25_seq_forward_start,
163	.next   = x25_seq_forward_next,
164	.stop   = x25_seq_forward_stop,
165	.show   = x25_seq_forward_show,
166};
167
168int __init x25_proc_init(void)
169{
170	if (!proc_mkdir("x25", init_net.proc_net))
171		return -ENOMEM;
172
173	if (!proc_create_seq("x25/route", 0444, init_net.proc_net,
174			 &x25_seq_route_ops))
175		goto out;
176
177	if (!proc_create_seq("x25/socket", 0444, init_net.proc_net,
178			 &x25_seq_socket_ops))
179		goto out;
180
181	if (!proc_create_seq("x25/forward", 0444, init_net.proc_net,
182			 &x25_seq_forward_ops))
183		goto out;
184	return 0;
185
186out:
187	remove_proc_subtree("x25", init_net.proc_net);
188	return -ENOMEM;
189}
190
191void __exit x25_proc_exit(void)
192{
193	remove_proc_subtree("x25", init_net.proc_net);
194}
195
196#else /* CONFIG_PROC_FS */
197
198int __init x25_proc_init(void)
199{
200	return 0;
201}
202
203void __exit x25_proc_exit(void)
204{
205}
206#endif /* CONFIG_PROC_FS */
207