Merge remote branch 'tip/perf/core' into oprofile/core
[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / llc / llc_proc.c
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 llc_sap *sap;
36         struct sock *sk = NULL;
37         int i;
38
39         list_for_each_entry_rcu(sap, &llc_sap_list, node) {
40                 spin_lock_bh(&sap->sk_lock);
41                 for (i = 0; i < LLC_SK_LADDR_HASH_ENTRIES; i++) {
42                         struct hlist_nulls_head *head = &sap->sk_laddr_hash[i];
43                         struct hlist_nulls_node *node;
44
45                         sk_nulls_for_each(sk, node, head) {
46                                 if (!pos)
47                                         goto found; /* keep the lock */
48                                 --pos;
49                         }
50                 }
51                 spin_unlock_bh(&sap->sk_lock);
52         }
53         sk = NULL;
54 found:
55         return sk;
56 }
57
58 static void *llc_seq_start(struct seq_file *seq, loff_t *pos)
59 {
60         loff_t l = *pos;
61
62         rcu_read_lock_bh();
63         return l ? llc_get_sk_idx(--l) : SEQ_START_TOKEN;
64 }
65
66 static struct sock *laddr_hash_next(struct llc_sap *sap, int bucket)
67 {
68         struct hlist_nulls_node *node;
69         struct sock *sk = NULL;
70
71         while (++bucket < LLC_SK_LADDR_HASH_ENTRIES)
72                 sk_nulls_for_each(sk, node, &sap->sk_laddr_hash[bucket])
73                         goto out;
74
75 out:
76         return sk;
77 }
78
79 static void *llc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
80 {
81         struct sock* sk, *next;
82         struct llc_sock *llc;
83         struct llc_sap *sap;
84
85         ++*pos;
86         if (v == SEQ_START_TOKEN) {
87                 sk = llc_get_sk_idx(0);
88                 goto out;
89         }
90         sk = v;
91         next = sk_nulls_next(sk);
92         if (next) {
93                 sk = next;
94                 goto out;
95         }
96         llc = llc_sk(sk);
97         sap = llc->sap;
98         sk = laddr_hash_next(sap, llc_sk_laddr_hashfn(sap, &llc->laddr));
99         if (sk)
100                 goto out;
101         spin_unlock_bh(&sap->sk_lock);
102         list_for_each_entry_continue_rcu(sap, &llc_sap_list, node) {
103                 spin_lock_bh(&sap->sk_lock);
104                 sk = laddr_hash_next(sap, -1);
105                 if (sk)
106                         break; /* keep the lock */
107                 spin_unlock_bh(&sap->sk_lock);
108         }
109 out:
110         return sk;
111 }
112
113 static void llc_seq_stop(struct seq_file *seq, void *v)
114 {
115         if (v && v != SEQ_START_TOKEN) {
116                 struct sock *sk = v;
117                 struct llc_sock *llc = llc_sk(sk);
118                 struct llc_sap *sap = llc->sap;
119
120                 spin_unlock_bh(&sap->sk_lock);
121         }
122         rcu_read_unlock_bh();
123 }
124
125 static int llc_seq_socket_show(struct seq_file *seq, void *v)
126 {
127         struct sock* sk;
128         struct llc_sock *llc;
129
130         if (v == SEQ_START_TOKEN) {
131                 seq_puts(seq, "SKt Mc local_mac_sap        remote_mac_sap   "
132                               "    tx_queue rx_queue st uid link\n");
133                 goto out;
134         }
135         sk = v;
136         llc = llc_sk(sk);
137
138         /* FIXME: check if the address is multicast */
139         seq_printf(seq, "%2X  %2X ", sk->sk_type, 0);
140
141         if (llc->dev)
142                 llc_ui_format_mac(seq, llc->dev->dev_addr);
143         else {
144                 u8 addr[6] = {0,0,0,0,0,0};
145                 llc_ui_format_mac(seq, addr);
146         }
147         seq_printf(seq, "@%02X ", llc->sap->laddr.lsap);
148         llc_ui_format_mac(seq, llc->daddr.mac);
149         seq_printf(seq, "@%02X %8d %8d %2d %3d %4d\n", llc->daddr.lsap,
150                    sk_wmem_alloc_get(sk),
151                    sk_rmem_alloc_get(sk) - llc->copied_seq,
152                    sk->sk_state,
153                    sk->sk_socket ? SOCK_INODE(sk->sk_socket)->i_uid : -1,
154                    llc->link);
155 out:
156         return 0;
157 }
158
159 static const char *const llc_conn_state_names[] = {
160         [LLC_CONN_STATE_ADM] =        "adm",
161         [LLC_CONN_STATE_SETUP] =      "setup",
162         [LLC_CONN_STATE_NORMAL] =     "normal",
163         [LLC_CONN_STATE_BUSY] =       "busy",
164         [LLC_CONN_STATE_REJ] =        "rej",
165         [LLC_CONN_STATE_AWAIT] =      "await",
166         [LLC_CONN_STATE_AWAIT_BUSY] = "await_busy",
167         [LLC_CONN_STATE_AWAIT_REJ] =  "await_rej",
168         [LLC_CONN_STATE_D_CONN] =     "d_conn",
169         [LLC_CONN_STATE_RESET] =      "reset",
170         [LLC_CONN_STATE_ERROR] =      "error",
171         [LLC_CONN_STATE_TEMP] =       "temp",
172 };
173
174 static int llc_seq_core_show(struct seq_file *seq, void *v)
175 {
176         struct sock* sk;
177         struct llc_sock *llc;
178
179         if (v == SEQ_START_TOKEN) {
180                 seq_puts(seq, "Connection list:\n"
181                               "dsap state      retr txw rxw pf ff sf df rs cs "
182                               "tack tpfc trs tbs blog busr\n");
183                 goto out;
184         }
185         sk = v;
186         llc = llc_sk(sk);
187
188         seq_printf(seq, " %02X  %-10s %3d  %3d %3d %2d %2d %2d %2d %2d %2d "
189                         "%4d %4d %3d %3d %4d %4d\n",
190                    llc->daddr.lsap, llc_conn_state_names[llc->state],
191                    llc->retry_count, llc->k, llc->rw, llc->p_flag, llc->f_flag,
192                    llc->s_flag, llc->data_flag, llc->remote_busy_flag,
193                    llc->cause_flag, timer_pending(&llc->ack_timer.timer),
194                    timer_pending(&llc->pf_cycle_timer.timer),
195                    timer_pending(&llc->rej_sent_timer.timer),
196                    timer_pending(&llc->busy_state_timer.timer),
197                    !!sk->sk_backlog.tail, !!sock_owned_by_user(sk));
198 out:
199         return 0;
200 }
201
202 static const struct seq_operations llc_seq_socket_ops = {
203         .start  = llc_seq_start,
204         .next   = llc_seq_next,
205         .stop   = llc_seq_stop,
206         .show   = llc_seq_socket_show,
207 };
208
209 static const struct seq_operations llc_seq_core_ops = {
210         .start  = llc_seq_start,
211         .next   = llc_seq_next,
212         .stop   = llc_seq_stop,
213         .show   = llc_seq_core_show,
214 };
215
216 static int llc_seq_socket_open(struct inode *inode, struct file *file)
217 {
218         return seq_open(file, &llc_seq_socket_ops);
219 }
220
221 static int llc_seq_core_open(struct inode *inode, struct file *file)
222 {
223         return seq_open(file, &llc_seq_core_ops);
224 }
225
226 static const struct file_operations llc_seq_socket_fops = {
227         .owner          = THIS_MODULE,
228         .open           = llc_seq_socket_open,
229         .read           = seq_read,
230         .llseek         = seq_lseek,
231         .release        = seq_release,
232 };
233
234 static const struct file_operations llc_seq_core_fops = {
235         .owner          = THIS_MODULE,
236         .open           = llc_seq_core_open,
237         .read           = seq_read,
238         .llseek         = seq_lseek,
239         .release        = seq_release,
240 };
241
242 static struct proc_dir_entry *llc_proc_dir;
243
244 int __init llc_proc_init(void)
245 {
246         int rc = -ENOMEM;
247         struct proc_dir_entry *p;
248
249         llc_proc_dir = proc_mkdir("llc", init_net.proc_net);
250         if (!llc_proc_dir)
251                 goto out;
252
253         p = proc_create("socket", S_IRUGO, llc_proc_dir, &llc_seq_socket_fops);
254         if (!p)
255                 goto out_socket;
256
257         p = proc_create("core", S_IRUGO, llc_proc_dir, &llc_seq_core_fops);
258         if (!p)
259                 goto out_core;
260
261         rc = 0;
262 out:
263         return rc;
264 out_core:
265         remove_proc_entry("socket", llc_proc_dir);
266 out_socket:
267         remove_proc_entry("llc", init_net.proc_net);
268         goto out;
269 }
270
271 void llc_proc_exit(void)
272 {
273         remove_proc_entry("socket", llc_proc_dir);
274         remove_proc_entry("core", llc_proc_dir);
275         remove_proc_entry("llc", init_net.proc_net);
276 }