1/*
2 * proc_llc.c - proc interface for LLC
3 *
4 * Copyright (c) 2001 by Jay Schulist <jschlst@samba.org>
5 *		 2002-2003 by Arnaldo Carvalho de Melo <acme@conectiva.com.br>
6 *
7 * This program can be redistributed or modified under the terms of the
8 * GNU General Public License as published by the Free Software Foundation.
9 * This program is distributed without any warranty or implied warranty
10 * of merchantability or fitness for a particular purpose.
11 *
12 * See the GNU General Public License for more details.
13 */
14
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/proc_fs.h>
18#include <linux/errno.h>
19#include <linux/seq_file.h>
20#include <linux/export.h>
21#include <net/net_namespace.h>
22#include <net/sock.h>
23#include <net/llc.h>
24#include <net/llc_c_ac.h>
25#include <net/llc_c_ev.h>
26#include <net/llc_c_st.h>
27#include <net/llc_conn.h>
28
29static void llc_ui_format_mac(struct seq_file *seq, u8 *addr)
30{
31	seq_printf(seq, "%pM", addr);
32}
33
34static struct sock *llc_get_sk_idx(loff_t pos)
35{
36	struct llc_sap *sap;
37	struct sock *sk = NULL;
38	int i;
39
40	list_for_each_entry_rcu(sap, &llc_sap_list, node) {
41		spin_lock_bh(&sap->sk_lock);
42		for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
43			struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
44			struct hlist_nulls_node *node;
45
46			sk_nulls_for_each(sk, node, head) {
47				if (!pos)
48					goto found; /* keep the lock */
49				--pos;
50			}
51		}
52		spin_unlock_bh(&sap->sk_lock);
53	}
54	sk = NULL;
55found:
56	return sk;
57}
58
59static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
60{
61	loff_t l = *pos;
62
63	rcu_read_lock_bh();
64	return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
65}
66
67static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
68{
69	struct hlist_nulls_node *node;
70	struct sock *sk = NULL;
71
72	while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
73		sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
74			goto out;
75
76out:
77	return sk;
78}
79
80static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
81{
82	struct sock* sk, *next;
83	struct llc_sock *llc;
84	struct llc_sap *sap;
85
86	++*pos;
87	if (v == SEQ_START_TOKEN) {
88		sk = llc_get_sk_idx(0);
89		goto out;
90	}
91	sk = v;
92	next = sk_nulls_next(sk);
93	if (next) {
94		sk = next;
95		goto out;
96	}
97	llc = llc_sk(sk);
98	sap = llc->sap;
99	sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
100	if (sk)
101		goto out;
102	spin_unlock_bh(&sap->sk_lock);
103	list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
104		spin_lock_bh(&sap->sk_lock);
105		sk = laddr_hash_next(sap, -1);
106		if (sk)
107			break; /* keep the lock */
108		spin_unlock_bh(&sap->sk_lock);
109	}
110out:
111	return sk;
112}
113
114static void llc_seq_stop(struct seq_file *seq, void *v)
115{
116	if (v && v != SEQ_START_TOKEN) {
117		struct sock *sk = v;
118		struct llc_sock *llc = llc_sk(sk);
119		struct llc_sap *sap = llc->sap;
120
121		spin_unlock_bh(&sap->sk_lock);
122	}
123	rcu_read_unlock_bh();
124}
125
126static int llc_seq_socket_show(struct seq_file *seq, void *v)
127{
128	struct sock* sk;
129	struct llc_sock *llc;
130
131	if (v == SEQ_START_TOKEN) {
132		seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
133			      "    tx_queue rx_queue st uid link\n");
134		goto out;
135	}
136	sk = v;
137	llc = llc_sk(sk);
138
139	/* FIXME: check if the address is multicast */
140	seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
141
142	if (llc->dev)
143		llc_ui_format_mac(seq, llc->dev->dev_addr);
144	else {
145		u8 addr[6] = {0,0,0,0,0,0};
146		llc_ui_format_mac(seq, addr);
147	}
148	seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
149	llc_ui_format_mac(seq, llc->daddr.mac);
150	seq_printf(seq, "@%02X %8d %8d %2d %3u %4d\n", llc->daddr.lsap,
151		   sk_wmem_alloc_get(sk),
152		   sk_rmem_alloc_get(sk) - llc->copied_seq,
153		   sk->sk_state,
154		   from_kuid_munged(seq_user_ns(seq), sock_i_uid(sk)),
155		   llc->link);
156out:
157	return 0;
158}
159
160static const char *const llc_conn_state_names[] = {
161	[LLC_CONN_STATE_ADM] =        "adm",
162	[LLC_CONN_STATE_SETUP] =      "setup",
163	[LLC_CONN_STATE_NORMAL] =     "normal",
164	[LLC_CONN_STATE_BUSY] =       "busy",
165	[LLC_CONN_STATE_REJ] =        "rej",
166	[LLC_CONN_STATE_AWAIT] =      "await",
167	[LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
168	[LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
169	[LLC_CONN_STATE_D_CONN]	=     "d_conn",
170	[LLC_CONN_STATE_RESET] =      "reset",
171	[LLC_CONN_STATE_ERROR] =      "error",
172	[LLC_CONN_STATE_TEMP] =       "temp",
173};
174
175static int llc_seq_core_show(struct seq_file *seq, void *v)
176{
177	struct sock* sk;
178	struct llc_sock *llc;
179
180	if (v == SEQ_START_TOKEN) {
181		seq_puts(seq, "Connection list:\n"
182			      "dsap state      retr txw rxw pf ff sf df rs cs "
183			      "tack tpfc trs tbs blog busr\n");
184		goto out;
185	}
186	sk = v;
187	llc = llc_sk(sk);
188
189	seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
190			"%4d %4d %3d %3d %4d %4d\n",
191		   llc->daddr.lsap, llc_conn_state_names[llc->state],
192		   llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
193		   llc->s_flag, llc->data_flag, llc->remote_busy_flag,
194		   llc->cause_flag, timer_pending(&llc->ack_timer.timer),
195		   timer_pending(&llc->pf_cycle_timer.timer),
196		   timer_pending(&llc->rej_sent_timer.timer),
197		   timer_pending(&llc->busy_state_timer.timer),
198		   !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
199out:
200	return 0;
201}
202
203static const struct seq_operations llc_seq_socket_ops = {
204	.start  = llc_seq_start,
205	.next   = llc_seq_next,
206	.stop   = llc_seq_stop,
207	.show   = llc_seq_socket_show,
208};
209
210static const struct seq_operations llc_seq_core_ops = {
211	.start  = llc_seq_start,
212	.next   = llc_seq_next,
213	.stop   = llc_seq_stop,
214	.show   = llc_seq_core_show,
215};
216
217static int llc_seq_socket_open(struct inode *inode, struct file *file)
218{
219	return seq_open(file, &llc_seq_socket_ops);
220}
221
222static int llc_seq_core_open(struct inode *inode, struct file *file)
223{
224	return seq_open(file, &llc_seq_core_ops);
225}
226
227static const struct file_operations llc_seq_socket_fops = {
228	.owner		= THIS_MODULE,
229	.open		= llc_seq_socket_open,
230	.read		= seq_read,
231	.llseek		= seq_lseek,
232	.release	= seq_release,
233};
234
235static const struct file_operations llc_seq_core_fops = {
236	.owner		= THIS_MODULE,
237	.open		= llc_seq_core_open,
238	.read		= seq_read,
239	.llseek		= seq_lseek,
240	.release	= seq_release,
241};
242
243static struct proc_dir_entry *llc_proc_dir;
244
245int __init llc_proc_init(void)
246{
247	int rc = -ENOMEM;
248	struct proc_dir_entry *p;
249
250	llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
251	if (!llc_proc_dir)
252		goto out;
253
254	p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
255	if (!p)
256		goto out_socket;
257
258	p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
259	if (!p)
260		goto out_core;
261
262	rc = 0;
263out:
264	return rc;
265out_core:
266	remove_proc_entry("socket", llc_proc_dir);
267out_socket:
268	remove_proc_entry("llc", init_net.proc_net);
269	goto out;
270}
271
272void llc_proc_exit(void)
273{
274	remove_proc_entry("socket", llc_proc_dir);
275	remove_proc_entry("core", llc_proc_dir);
276	remove_proc_entry("llc", init_net.proc_net);
277}
278