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 romieu@fr.zoreil.com
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/atmclip.h>
25 #include <linux/init.h> /* for __init */
26 #include <linux/slab.h>
27 #include <net/net_namespace.h>
28 #include <net/atmclip.h>
29 #include <linux/uaccess.h>
30 #include <linux/param.h> /* for HZ */
31 #include <linux/atomic.h>
32 #include "resources.h"
33 #include "common.h" /* atm_proc_init prototype */
34 #include "signaling.h" /* to get sigd - ugly too */
35
36 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
37 size_t count, loff_t *pos);
38
39 static const struct proc_ops atm_dev_proc_ops = {
40 .proc_read = proc_dev_atm_read,
41 .proc_lseek = noop_llseek,
42 };
43
44 static void add_stats(struct seq_file *seq, const char *aal,
45 const struct k_atm_aal_stats *stats)
46 {
47 seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
48 atomic_read(&stats->tx), atomic_read(&stats->tx_err),
49 atomic_read(&stats->rx), atomic_read(&stats->rx_err),
50 atomic_read(&stats->rx_drop));
51 }
52
53 static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
54 {
55 int i;
56
57 seq_printf(seq, "%3d %-8s", dev->number, dev->type);
58 for (i = 0; i < ESI_LEN; i++)
59 seq_printf(seq, "%02x", dev->esi[i]);
60 seq_puts(seq, " ");
61 add_stats(seq, "", &dev->stats.aal0);
62 seq_puts(seq, " ");
63 add_stats(seq, "5", &dev->stats.aal5);
64 seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt));
65 seq_putc(seq, '\n');
66 }
67
68 struct vcc_state {
69 int bucket;
70 struct sock *sk;
71 };
72
73 static inline int compare_family(struct sock *sk, int family)
74 {
75 return !family || (sk->sk_family == family);
76 }
77
78 static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
79 {
80 struct sock *sk = *sock;
81
82 if (sk == SEQ_START_TOKEN) {
83 for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
84 struct hlist_head *head = &vcc_hash[*bucket];
85
86 sk = hlist_empty(head) ? NULL : __sk_head(head);
87 if (sk)
88 break;
89 }
90 l--;
91 }
92 try_again:
93 for (; sk; sk = sk_next(sk)) {
94 l -= compare_family(sk, family);
95 if (l < 0)
96 goto out;
97 }
98 if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
99 sk = sk_head(&vcc_hash[*bucket]);
100 goto try_again;
101 }
102 sk = SEQ_START_TOKEN;
103 out:
104 *sock = sk;
105 return (l < 0);
106 }
107
108 static inline void *vcc_walk(struct seq_file *seq, loff_t l)
109 {
110 struct vcc_state *state = seq->private;
111 int family = (uintptr_t)(pde_data(file_inode(seq->file)));
112
113 return __vcc_walk(&state->sk, family, &state->bucket, l) ?
114 state : NULL;
115 }
116
117 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
118 __acquires(vcc_sklist_lock)
119 {
120 struct vcc_state *state = seq->private;
121 loff_t left = *pos;
122
123 read_lock(&vcc_sklist_lock);
124 state->sk = SEQ_START_TOKEN;
125 return left ? vcc_walk(seq, left) : SEQ_START_TOKEN;
126 }
127
128 static void vcc_seq_stop(struct seq_file *seq, void *v)
129 __releases(vcc_sklist_lock)
130 {
131 read_unlock(&vcc_sklist_lock);
132 }
133
134 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
135 {
136 v = vcc_walk(seq, 1);
137 (*pos)++;
138 return v;
139 }
140
141 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc)
142 {
143 static const char *const class_name[] = {
144 "off", "UBR", "CBR", "VBR", "ABR"};
145 static const char *const aal_name[] = {
146 "---", "1", "2", "3/4", /* 0- 3 */
147 "???", "5", "???", "???", /* 4- 7 */
148 "???", "???", "???", "???", /* 8-11 */
149 "???", "", "???", "???"}; /* 12-15 */
150
151 seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
152 vcc->dev->number, vcc->vpi, vcc->vci,
153 vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
154 aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr,
155 class_name[vcc->qos.rxtp.traffic_class],
156 vcc->qos.txtp.min_pcr,
157 class_name[vcc->qos.txtp.traffic_class]);
158 if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
159 struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
160 struct net_device *dev;
161
162 dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
163 seq_printf(seq, "CLIP, Itf:%s, Encap:",
164 dev ? dev->name : "none?");
165 seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
166 }
167 seq_putc(seq, '\n');
168 }
169
170 static const char *vcc_state(struct atm_vcc *vcc)
171 {
172 static const char *const map[] = { ATM_VS2TXT_MAP };
173
174 return map[ATM_VF2VS(vcc->flags)];
175 }
176
177 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
178 {
179 struct sock *sk = sk_atm(vcc);
180
181 seq_printf(seq, "%pK ", vcc);
182 if (!vcc->dev)
183 seq_printf(seq, "Unassigned ");
184 else
185 seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
186 vcc->vci);
187 switch (sk->sk_family) {
188 case AF_ATMPVC:
189 seq_printf(seq, "PVC");
190 break;
191 case AF_ATMSVC:
192 seq_printf(seq, "SVC");
193 break;
194 default:
195 seq_printf(seq, "%3d", sk->sk_family);
196 }
197 seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n",
198 vcc->flags, sk->sk_err,
199 sk_wmem_alloc_get(sk), sk->sk_sndbuf,
200 sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
201 refcount_read(&sk->sk_refcnt));
202 }
203
204 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
205 {
206 if (!vcc->dev)
207 seq_printf(seq, sizeof(void *) == 4 ?
208 "N/A@%pK%10s" : "N/A@%pK%2s", vcc, "");
209 else
210 seq_printf(seq, "%3d %3d %5d ",
211 vcc->dev->number, vcc->vpi, vcc->vci);
212 seq_printf(seq, "%-10s ", vcc_state(vcc));
213 seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
214 *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : "");
215 if (*vcc->remote.sas_addr.prv) {
216 int i;
217
218 for (i = 0; i < ATM_ESA_LEN; i++)
219 seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
220 }
221 seq_putc(seq, '\n');
222 }
223
224 static int atm_dev_seq_show(struct seq_file *seq, void *v)
225 {
226 static char atm_dev_banner[] =
227 "Itf Type ESI/\"MAC\"addr "
228 "AAL(TX,err,RX,err,drop) ... [refcnt]\n";
229
230 if (v == &atm_devs)
231 seq_puts(seq, atm_dev_banner);
232 else {
233 struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
234
235 atm_dev_info(seq, dev);
236 }
237 return 0;
238 }
239
240 static const struct seq_operations atm_dev_seq_ops = {
241 .start = atm_dev_seq_start,
242 .next = atm_dev_seq_next,
243 .stop = atm_dev_seq_stop,
244 .show = atm_dev_seq_show,
245 };
246
247 static int pvc_seq_show(struct seq_file *seq, void *v)
248 {
249 static char atm_pvc_banner[] =
250 "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n";
251
252 if (v == SEQ_START_TOKEN)
253 seq_puts(seq, atm_pvc_banner);
254 else {
255 struct vcc_state *state = seq->private;
256 struct atm_vcc *vcc = atm_sk(state->sk);
257
258 pvc_info(seq, vcc);
259 }
260 return 0;
261 }
262
263 static const struct seq_operations pvc_seq_ops = {
264 .start = vcc_seq_start,
265 .next = vcc_seq_next,
266 .stop = vcc_seq_stop,
267 .show = pvc_seq_show,
268 };
269
270 static int vcc_seq_show(struct seq_file *seq, void *v)
271 {
272 if (v == SEQ_START_TOKEN) {
273 seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
274 "Address ", "Itf VPI VCI Fam Flags Reply "
275 "Send buffer Recv buffer [refcnt]\n");
276 } else {
277 struct vcc_state *state = seq->private;
278 struct atm_vcc *vcc = atm_sk(state->sk);
279
280 vcc_info(seq, vcc);
281 }
282 return 0;
283 }
284
285 static const struct seq_operations vcc_seq_ops = {
286 .start = vcc_seq_start,
287 .next = vcc_seq_next,
288 .stop = vcc_seq_stop,
289 .show = vcc_seq_show,
290 };
291
292 static int svc_seq_show(struct seq_file *seq, void *v)
293 {
294 static const char atm_svc_banner[] =
295 "Itf VPI VCI State Remote\n";
296
297 if (v == SEQ_START_TOKEN)
298 seq_puts(seq, atm_svc_banner);
299 else {
300 struct vcc_state *state = seq->private;
301 struct atm_vcc *vcc = atm_sk(state->sk);
302
303 svc_info(seq, vcc);
304 }
305 return 0;
306 }
307
308 static const struct seq_operations svc_seq_ops = {
309 .start = vcc_seq_start,
310 .next = vcc_seq_next,
311 .stop = vcc_seq_stop,
312 .show = svc_seq_show,
313 };
314
315 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
316 size_t count, loff_t *pos)
317 {
318 struct atm_dev *dev;
319 unsigned long page;
320 int length;
321
322 if (count == 0)
323 return 0;
324 page = get_zeroed_page(GFP_KERNEL);
325 if (!page)
326 return -ENOMEM;
327 dev = pde_data(file_inode(file));
328 if (!dev->ops->proc_read)
329 length = -EINVAL;
330 else {
331 length = dev->ops->proc_read(dev, pos, (char *)page);
332 if (length > count)
333 length = -EINVAL;
334 }
335 if (length >= 0) {
336 if (copy_to_user(buf, (char *)page, length))
337 length = -EFAULT;
338 (*pos)++;
339 }
340 free_page(page);
341 return length;
342 }
343
344 struct proc_dir_entry *atm_proc_root;
345 EXPORT_SYMBOL(atm_proc_root);
346
347
348 int atm_proc_dev_register(struct atm_dev *dev)
349 {
350 int error;
351
352 /* No proc info */
353 if (!dev->ops->proc_read)
354 return 0;
355
356 error = -ENOMEM;
357 dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number);
358 if (!dev->proc_name)
359 goto err_out;
360
361 dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
362 &atm_dev_proc_ops, dev);
363 if (!dev->proc_entry)
364 goto err_free_name;
365 return 0;
366
367 err_free_name:
368 kfree(dev->proc_name);
369 err_out:
370 return error;
371 }
372
373 void atm_proc_dev_deregister(struct atm_dev *dev)
374 {
375 if (!dev->ops->proc_read)
376 return;
377
378 remove_proc_entry(dev->proc_name, atm_proc_root);
379 kfree(dev->proc_name);
380 }
381
382 int __init atm_proc_init(void)
383 {
384 atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
385 if (!atm_proc_root)
386 return -ENOMEM;
387 proc_create_seq("devices", 0444, atm_proc_root, &atm_dev_seq_ops);
388 proc_create_seq_private("pvc", 0444, atm_proc_root, &pvc_seq_ops,
389 sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMPVC);
390 proc_create_seq_private("svc", 0444, atm_proc_root, &svc_seq_ops,
391 sizeof(struct vcc_state), (void *)(uintptr_t)PF_ATMSVC);
392 proc_create_seq_private("vc", 0444, atm_proc_root, &vcc_seq_ops,
393 sizeof(struct vcc_state), NULL);
394 return 0;
395 }
396
397 void atm_proc_exit(void)
398 {
399 remove_proc_subtree("atm", init_net.proc_net);
400 }
401
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