xref: /openbmc/linux/net/llc/llc_proc.c (revision b6dcefde)
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 <net/net_namespace.h>
21 #include <net/sock.h>
22 #include <net/llc.h>
23 #include <net/llc_c_ac.h>
24 #include <net/llc_c_ev.h>
25 #include <net/llc_c_st.h>
26 #include <net/llc_conn.h>
27 
28 static void llc_ui_format_mac(struct seq_file *seq, u8 *addr)
29 {
30 	seq_printf(seq, "%pM", addr);
31 }
32 
33 static struct sock *llc_get_sk_idx(loff_t pos)
34 {
35 	struct list_head *sap_entry;
36 	struct llc_sap *sap;
37 	struct hlist_node *node;
38 	struct sock *sk = NULL;
39 
40 	list_for_each(sap_entry, &llc_sap_list) {
41 		sap = list_entry(sap_entry, struct llc_sap, node);
42 
43 		read_lock_bh(&sap->sk_list.lock);
44 		sk_for_each(sk, node, &sap->sk_list.list) {
45 			if (!pos)
46 				goto found;
47 			--pos;
48 		}
49 		read_unlock_bh(&sap->sk_list.lock);
50 	}
51 	sk = NULL;
52 found:
53 	return sk;
54 }
55 
56 static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
57 {
58 	loff_t l = *pos;
59 
60 	read_lock_bh(&llc_sap_list_lock);
61 	return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
62 }
63 
64 static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
65 {
66 	struct sock* sk, *next;
67 	struct llc_sock *llc;
68 	struct llc_sap *sap;
69 
70 	++*pos;
71 	if (v == SEQ_START_TOKEN) {
72 		sk = llc_get_sk_idx(0);
73 		goto out;
74 	}
75 	sk = v;
76 	next = sk_next(sk);
77 	if (next) {
78 		sk = next;
79 		goto out;
80 	}
81 	llc = llc_sk(sk);
82 	sap = llc->sap;
83 	read_unlock_bh(&sap->sk_list.lock);
84 	sk = NULL;
85 	for (;;) {
86 		if (sap->node.next == &llc_sap_list)
87 			break;
88 		sap = list_entry(sap->node.next, struct llc_sap, node);
89 		read_lock_bh(&sap->sk_list.lock);
90 		if (!hlist_empty(&sap->sk_list.list)) {
91 			sk = sk_head(&sap->sk_list.list);
92 			break;
93 		}
94 		read_unlock_bh(&sap->sk_list.lock);
95 	}
96 out:
97 	return sk;
98 }
99 
100 static void llc_seq_stop(struct seq_file *seq, void *v)
101 {
102 	if (v && v != SEQ_START_TOKEN) {
103 		struct sock *sk = v;
104 		struct llc_sock *llc = llc_sk(sk);
105 		struct llc_sap *sap = llc->sap;
106 
107 		read_unlock_bh(&sap->sk_list.lock);
108 	}
109 	read_unlock_bh(&llc_sap_list_lock);
110 }
111 
112 static int llc_seq_socket_show(struct seq_file *seq, void *v)
113 {
114 	struct sock* sk;
115 	struct llc_sock *llc;
116 
117 	if (v == SEQ_START_TOKEN) {
118 		seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
119 			      "    tx_queue rx_queue st uid link\n");
120 		goto out;
121 	}
122 	sk = v;
123 	llc = llc_sk(sk);
124 
125 	/* FIXME: check if the address is multicast */
126 	seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
127 
128 	if (llc->dev)
129 		llc_ui_format_mac(seq, llc->dev->dev_addr);
130 	else {
131 		u8 addr[6] = {0,0,0,0,0,0};
132 		llc_ui_format_mac(seq, addr);
133 	}
134 	seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
135 	llc_ui_format_mac(seq, llc->daddr.mac);
136 	seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
137 		   sk_wmem_alloc_get(sk),
138 		   sk_rmem_alloc_get(sk) - llc->copied_seq,
139 		   sk->sk_state,
140 		   sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
141 		   llc->link);
142 out:
143 	return 0;
144 }
145 
146 static const char *const llc_conn_state_names[] = {
147 	[LLC_CONN_STATE_ADM] =        "adm",
148 	[LLC_CONN_STATE_SETUP] =      "setup",
149 	[LLC_CONN_STATE_NORMAL] =     "normal",
150 	[LLC_CONN_STATE_BUSY] =       "busy",
151 	[LLC_CONN_STATE_REJ] =        "rej",
152 	[LLC_CONN_STATE_AWAIT] =      "await",
153 	[LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
154 	[LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
155 	[LLC_CONN_STATE_D_CONN]	=     "d_conn",
156 	[LLC_CONN_STATE_RESET] =      "reset",
157 	[LLC_CONN_STATE_ERROR] =      "error",
158 	[LLC_CONN_STATE_TEMP] =       "temp",
159 };
160 
161 static int llc_seq_core_show(struct seq_file *seq, void *v)
162 {
163 	struct sock* sk;
164 	struct llc_sock *llc;
165 
166 	if (v == SEQ_START_TOKEN) {
167 		seq_puts(seq, "Connection list:\n"
168 			      "dsap state      retr txw rxw pf ff sf df rs cs "
169 			      "tack tpfc trs tbs blog busr\n");
170 		goto out;
171 	}
172 	sk = v;
173 	llc = llc_sk(sk);
174 
175 	seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
176 			"%4d %4d %3d %3d %4d %4d\n",
177 		   llc->daddr.lsap, llc_conn_state_names[llc->state],
178 		   llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
179 		   llc->s_flag, llc->data_flag, llc->remote_busy_flag,
180 		   llc->cause_flag, timer_pending(&llc->ack_timer.timer),
181 		   timer_pending(&llc->pf_cycle_timer.timer),
182 		   timer_pending(&llc->rej_sent_timer.timer),
183 		   timer_pending(&llc->busy_state_timer.timer),
184 		   !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
185 out:
186 	return 0;
187 }
188 
189 static const struct seq_operations llc_seq_socket_ops = {
190 	.start  = llc_seq_start,
191 	.next   = llc_seq_next,
192 	.stop   = llc_seq_stop,
193 	.show   = llc_seq_socket_show,
194 };
195 
196 static const struct seq_operations llc_seq_core_ops = {
197 	.start  = llc_seq_start,
198 	.next   = llc_seq_next,
199 	.stop   = llc_seq_stop,
200 	.show   = llc_seq_core_show,
201 };
202 
203 static int llc_seq_socket_open(struct inode *inode, struct file *file)
204 {
205 	return seq_open(file, &llc_seq_socket_ops);
206 }
207 
208 static int llc_seq_core_open(struct inode *inode, struct file *file)
209 {
210 	return seq_open(file, &llc_seq_core_ops);
211 }
212 
213 static const struct file_operations llc_seq_socket_fops = {
214 	.owner		= THIS_MODULE,
215 	.open		= llc_seq_socket_open,
216 	.read		= seq_read,
217 	.llseek		= seq_lseek,
218 	.release	= seq_release,
219 };
220 
221 static const struct file_operations llc_seq_core_fops = {
222 	.owner		= THIS_MODULE,
223 	.open		= llc_seq_core_open,
224 	.read		= seq_read,
225 	.llseek		= seq_lseek,
226 	.release	= seq_release,
227 };
228 
229 static struct proc_dir_entry *llc_proc_dir;
230 
231 int __init llc_proc_init(void)
232 {
233 	int rc = -ENOMEM;
234 	struct proc_dir_entry *p;
235 
236 	llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
237 	if (!llc_proc_dir)
238 		goto out;
239 
240 	p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
241 	if (!p)
242 		goto out_socket;
243 
244 	p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
245 	if (!p)
246 		goto out_core;
247 
248 	rc = 0;
249 out:
250 	return rc;
251 out_core:
252 	remove_proc_entry("socket", llc_proc_dir);
253 out_socket:
254 	remove_proc_entry("llc", init_net.proc_net);
255 	goto out;
256 }
257 
258 void llc_proc_exit(void)
259 {
260 	remove_proc_entry("socket", llc_proc_dir);
261 	remove_proc_entry("core", llc_proc_dir);
262 	remove_proc_entry("llc", init_net.proc_net);
263 }
264