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1// SPDX-License-Identifier: GPL-2.0
2/* net/atm/proc.c - ATM /proc interface
3 *
4 * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA
5 *
6 * seq_file api usage by [email protected]
7 *
8 * Evaluating the efficiency of the whole thing if left as an exercise to
9 * the reader.
10 */
11
12#include <linux/module.h> /* for EXPORT_SYMBOL */
13#include <linux/string.h>
14#include <linux/types.h>
15#include <linux/mm.h>
16#include <linux/fs.h>
17#include <linux/stat.h>
18#include <linux/proc_fs.h>
19#include <linux/seq_file.h>
20#include <linux/errno.h>
21#include <linux/atm.h>
22#include <linux/atmdev.h>
23#include <linux/netdevice.h>
24#include <linux/init.h> /* for __init */
25#include <linux/slab.h>
26#include <net/net_namespace.h>
27#include <linux/uaccess.h>
28#include <linux/param.h> /* for HZ */
29#include <linux/atomic.h>
30#include "resources.h"
31#include "common.h" /* atm_proc_init prototype */
32
33static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
34 size_t count, loff_t *pos);
35
36static const struct proc_ops atm_dev_proc_ops = {
37 .proc_read = proc_dev_atm_read,
38 .proc_lseek = noop_llseek,
39};
40
41static void add_stats(struct seq_file *seq, const char *aal,
42 const struct k_atm_aal_stats *stats)
43{
44 seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
45 atomic_read(&stats->tx), atomic_read(&stats->tx_err),
46 atomic_read(&stats->rx), atomic_read(&stats->rx_err),
47 atomic_read(&stats->rx_drop));
48}
49
50static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
51{
52 int i;
53
54 seq_printf(seq, "%3d %-8s", dev->number, dev->type);
55 for (i = 0; i < ESI_LEN; i++)
56 seq_printf(seq, "%02x", dev->esi[i]);
57 seq_puts(seq, " ");
58 add_stats(seq, "0", &dev->stats.aal0);
59 seq_puts(seq, " ");
60 add_stats(seq, "5", &dev->stats.aal5);
61 seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt));
62 seq_putc(seq, '\n');
63}
64
65struct vcc_state {
66 int bucket;
67 struct sock *sk;
68};
69
70static inline int compare_family(struct sock *sk, int family)
71{
72 return !family || (sk->sk_family == family);
73}
74
75static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
76{
77 struct sock *sk = *sock;
78
79 if (sk == SEQ_START_TOKEN) {
80 for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
81 struct hlist_head *head = &vcc_hash[*bucket];
82
83 sk = hlist_empty(head) ? NULL : __sk_head(head);
84 if (sk)
85 break;
86 }
87 l--;
88 }
89try_again:
90 for (; sk; sk = sk_next(sk)) {
91 l -= compare_family(sk, family);
92 if (l < 0)
93 goto out;
94 }
95 if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
96 sk = sk_head(&vcc_hash[*bucket]);
97 goto try_again;
98 }
99 sk = SEQ_START_TOKEN;
100out:
101 *sock = sk;
102 return (l < 0);
103}
104
105static inline void *vcc_walk(struct seq_file *seq, loff_t l)
106{
107 struct vcc_state *state = seq->private;
108 int family = (uintptr_t)(pde_data(file_inode(seq->file)));
109
110 return __vcc_walk(&state->sk, family, &state->bucket, l) ?
111 state : NULL;
112}
113
114static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
115 __acquires(vcc_sklist_lock)
116{
117 struct vcc_state *state = seq->private;
118 loff_t left = *pos;
119
120 read_lock(&vcc_sklist_lock);
121 state->sk = SEQ_START_TOKEN;
122 return left ? vcc_walk(seq, left) : SEQ_START_TOKEN;
123}
124
125static void vcc_seq_stop(struct seq_file *seq, void *v)
126 __releases(vcc_sklist_lock)
127{
128 read_unlock(&vcc_sklist_lock);
129}
130
131static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
132{
133 v = vcc_walk(seq, 1);
134 (*pos)++;
135 return v;
136}
137
138static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc)
139{
140 static const char *const class_name[] = {
141 "off", "UBR", "CBR", "VBR", "ABR"};
142 static const char *const aal_name[] = {
143 "---", "1", "2", "3/4", /* 0- 3 */
144 "???", "5", "???", "???", /* 4- 7 */
145 "???", "???", "???", "???", /* 8-11 */
146 "???", "0", "???", "???"}; /* 12-15 */
147
148 seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
149 vcc->dev->number, vcc->vpi, vcc->vci,
150 vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
151 aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr,
152 class_name[vcc->qos.rxtp.traffic_class],
153 vcc->qos.txtp.min_pcr,
154 class_name[vcc->qos.txtp.traffic_class]);
155 seq_putc(seq, '\n');
156}
157
158static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
159{
160 struct sock *sk = sk_atm(vcc);
161
162 seq_printf(seq, "%pK ", vcc);
163 if (!vcc->dev)
164 seq_printf(seq, "Unassigned ");
165 else
166 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
167 vcc->vci);
168 switch (sk->sk_family) {
169 case AF_ATMPVC:
170 seq_printf(seq, "PVC");
171 break;
172 default:
173 seq_printf(seq, "%3d", sk->sk_family);
174 }
175 seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n",
176 vcc->flags, sk->sk_err,
177 sk_wmem_alloc_get(sk), sk->sk_sndbuf,
178 sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
179 refcount_read(&sk->sk_refcnt));
180}
181
182static int atm_dev_seq_show(struct seq_file *seq, void *v)
183{
184 static char atm_dev_banner[] =
185 "Itf Type ESI/\"MAC\"addr "
186 "AAL(TX,err,RX,err,drop) ... [refcnt]\n";
187
188 if (v == &atm_devs)
189 seq_puts(seq, atm_dev_banner);
190 else {
191 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
192
193 atm_dev_info(seq, dev);
194 }
195 return 0;
196}
197
198static const struct seq_operations atm_dev_seq_ops = {
199 .start = atm_dev_seq_start,
200 .next = atm_dev_seq_next,
201 .stop = atm_dev_seq_stop,
202 .show = atm_dev_seq_show,
203};
204
205static int pvc_seq_show(struct seq_file *seq, void *v)
206{
207 static char atm_pvc_banner[] =
208 "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n";
209
210 if (v == SEQ_START_TOKEN)
211 seq_puts(seq, atm_pvc_banner);
212 else {
213 struct vcc_state *state = seq->private;
214 struct atm_vcc *vcc = atm_sk(state->sk);
215
216 pvc_info(seq, vcc);
217 }
218 return 0;
219}
220
221static const struct seq_operations pvc_seq_ops = {
222 .start = vcc_seq_start,
223 .next = vcc_seq_next,
224 .stop = vcc_seq_stop,
225 .show = pvc_seq_show,
226};
227
228static int vcc_seq_show(struct seq_file *seq, void *v)
229{
230 if (v == SEQ_START_TOKEN) {
231 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
232 "Address ", "Itf VPI VCI Fam Flags Reply "
233 "Send buffer Recv buffer [refcnt]\n");
234 } else {
235 struct vcc_state *state = seq->private;
236 struct atm_vcc *vcc = atm_sk(state->sk);
237
238 vcc_info(seq, vcc);
239 }
240 return 0;
241}
242
243static const struct seq_operations vcc_seq_ops = {
244 .start = vcc_seq_start,
245 .next = vcc_seq_next,
246 .stop = vcc_seq_stop,
247 .show = vcc_seq_show,
248};
249
250static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
251 size_t count, loff_t *pos)
252{
253 struct atm_dev *dev;
254 unsigned long page;
255 int length;
256
257 if (count == 0)
258 return 0;
259 page = get_zeroed_page(GFP_KERNEL);
260 if (!page)
261 return -ENOMEM;
262 dev = pde_data(file_inode(file));
263 if (!dev->ops->proc_read)
264 length = -EINVAL;
265 else {
266 length = dev->ops->proc_read(dev, pos, (char *)page);
267 if (length > count)
268 length = -EINVAL;
269 }
270 if (length >= 0) {
271 if (copy_to_user(buf, (char *)page, length))
272 length = -EFAULT;
273 (*pos)++;
274 }
275 free_page(page);
276 return length;
277}
278
279struct proc_dir_entry *atm_proc_root;
280EXPORT_SYMBOL(atm_proc_root);
281
282
283int atm_proc_dev_register(struct atm_dev *dev)
284{
285 int error;
286
287 /* No proc info */
288 if (!dev->ops->proc_read)
289 return 0;
290
291 error = -ENOMEM;
292 dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number);
293 if (!dev->proc_name)
294 goto err_out;
295
296 dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
297 &atm_dev_proc_ops, dev);
298 if (!dev->proc_entry)
299 goto err_free_name;
300 return 0;
301
302err_free_name:
303 kfree(dev->proc_name);
304err_out:
305 return error;
306}
307
308void atm_proc_dev_deregister(struct atm_dev *dev)
309{
310 if (!dev->ops->proc_read)
311 return;
312
313 remove_proc_entry(dev->proc_name, atm_proc_root);
314 kfree(dev->proc_name);
315}
316
317int __init atm_proc_init(void)
318{
319 atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
320 if (!atm_proc_root)
321 return -ENOMEM;
322 proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops);
323 proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops,
324 sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC);
325 proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops,
326 sizeof(struct vcc_state), NULL);
327 return 0;
328}
329
330void atm_proc_exit(void)
331{
332 remove_proc_subtree("atm", init_net.proc_net);
333}