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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 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 file_operations proc_atm_dev_ops = { | |
40 | .owner = THIS_MODULE, | |
41 | .read = proc_dev_atm_read, | |
42 | .llseek = noop_llseek, | |
43 | }; | |
44 | ||
45 | static void add_stats(struct seq_file *seq, const char *aal, | |
46 | const struct k_atm_aal_stats *stats) | |
47 | { | |
48 | seq_printf(seq, "%s ( %d %d %d %d %d )", aal, | |
49 | atomic_read(&stats->tx), atomic_read(&stats->tx_err), | |
50 | atomic_read(&stats->rx), atomic_read(&stats->rx_err), | |
51 | atomic_read(&stats->rx_drop)); | |
52 | } | |
53 | ||
54 | static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev) | |
55 | { | |
56 | int i; | |
57 | ||
58 | seq_printf(seq, "%3d %-8s", dev->number, dev->type); | |
59 | for (i = 0; i < ESI_LEN; i++) | |
60 | seq_printf(seq, "%02x", dev->esi[i]); | |
61 | seq_puts(seq, " "); | |
62 | add_stats(seq, "0", &dev->stats.aal0); | |
63 | seq_puts(seq, " "); | |
64 | add_stats(seq, "5", &dev->stats.aal5); | |
65 | seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt)); | |
66 | seq_putc(seq, '\n'); | |
67 | } | |
68 | ||
69 | struct vcc_state { | |
70 | int bucket; | |
71 | struct sock *sk; | |
72 | int family; | |
73 | }; | |
74 | ||
75 | static inline int compare_family(struct sock *sk, int family) | |
76 | { | |
77 | return !family || (sk->sk_family == family); | |
78 | } | |
79 | ||
80 | static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l) | |
81 | { | |
82 | struct sock *sk = *sock; | |
83 | ||
84 | if (sk == SEQ_START_TOKEN) { | |
85 | for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) { | |
86 | struct hlist_head *head = &vcc_hash[*bucket]; | |
87 | ||
88 | sk = hlist_empty(head) ? NULL : __sk_head(head); | |
89 | if (sk) | |
90 | break; | |
91 | } | |
92 | l--; | |
93 | } | |
94 | try_again: | |
95 | for (; sk; sk = sk_next(sk)) { | |
96 | l -= compare_family(sk, family); | |
97 | if (l < 0) | |
98 | goto out; | |
99 | } | |
100 | if (!sk && ++*bucket < VCC_HTABLE_SIZE) { | |
101 | sk = sk_head(&vcc_hash[*bucket]); | |
102 | goto try_again; | |
103 | } | |
104 | sk = SEQ_START_TOKEN; | |
105 | out: | |
106 | *sock = sk; | |
107 | return (l < 0); | |
108 | } | |
109 | ||
110 | static inline void *vcc_walk(struct vcc_state *state, loff_t l) | |
111 | { | |
112 | return __vcc_walk(&state->sk, state->family, &state->bucket, l) ? | |
113 | state : NULL; | |
114 | } | |
115 | ||
116 | static int __vcc_seq_open(struct inode *inode, struct file *file, | |
117 | int family, const struct seq_operations *ops) | |
118 | { | |
119 | struct vcc_state *state; | |
120 | ||
121 | state = __seq_open_private(file, ops, sizeof(*state)); | |
122 | if (state == NULL) | |
123 | return -ENOMEM; | |
124 | ||
125 | state->family = family; | |
126 | return 0; | |
127 | } | |
128 | ||
129 | static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) | |
130 | __acquires(vcc_sklist_lock) | |
131 | { | |
132 | struct vcc_state *state = seq->private; | |
133 | loff_t left = *pos; | |
134 | ||
135 | read_lock(&vcc_sklist_lock); | |
136 | state->sk = SEQ_START_TOKEN; | |
137 | return left ? vcc_walk(state, left) : SEQ_START_TOKEN; | |
138 | } | |
139 | ||
140 | static void vcc_seq_stop(struct seq_file *seq, void *v) | |
141 | __releases(vcc_sklist_lock) | |
142 | { | |
143 | read_unlock(&vcc_sklist_lock); | |
144 | } | |
145 | ||
146 | static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
147 | { | |
148 | struct vcc_state *state = seq->private; | |
149 | ||
150 | v = vcc_walk(state, 1); | |
151 | *pos += !!PTR_ERR(v); | |
152 | return v; | |
153 | } | |
154 | ||
155 | static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) | |
156 | { | |
157 | static const char *const class_name[] = { | |
158 | "off", "UBR", "CBR", "VBR", "ABR"}; | |
159 | static const char *const aal_name[] = { | |
160 | "---", "1", "2", "3/4", /* 0- 3 */ | |
161 | "???", "5", "???", "???", /* 4- 7 */ | |
162 | "???", "???", "???", "???", /* 8-11 */ | |
163 | "???", "0", "???", "???"}; /* 12-15 */ | |
164 | ||
165 | seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", | |
166 | vcc->dev->number, vcc->vpi, vcc->vci, | |
167 | vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" : | |
168 | aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr, | |
169 | class_name[vcc->qos.rxtp.traffic_class], | |
170 | vcc->qos.txtp.min_pcr, | |
171 | class_name[vcc->qos.txtp.traffic_class]); | |
172 | if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) { | |
173 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); | |
174 | struct net_device *dev; | |
175 | ||
176 | dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL; | |
177 | seq_printf(seq, "CLIP, Itf:%s, Encap:", | |
178 | dev ? dev->name : "none?"); | |
179 | seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None"); | |
180 | } | |
181 | seq_putc(seq, '\n'); | |
182 | } | |
183 | ||
184 | static const char *vcc_state(struct atm_vcc *vcc) | |
185 | { | |
186 | static const char *const map[] = { ATM_VS2TXT_MAP }; | |
187 | ||
188 | return map[ATM_VF2VS(vcc->flags)]; | |
189 | } | |
190 | ||
191 | static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) | |
192 | { | |
193 | struct sock *sk = sk_atm(vcc); | |
194 | ||
195 | seq_printf(seq, "%pK ", vcc); | |
196 | if (!vcc->dev) | |
197 | seq_printf(seq, "Unassigned "); | |
198 | else | |
199 | seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, | |
200 | vcc->vci); | |
201 | switch (sk->sk_family) { | |
202 | case AF_ATMPVC: | |
203 | seq_printf(seq, "PVC"); | |
204 | break; | |
205 | case AF_ATMSVC: | |
206 | seq_printf(seq, "SVC"); | |
207 | break; | |
208 | default: | |
209 | seq_printf(seq, "%3d", sk->sk_family); | |
210 | } | |
211 | seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", | |
212 | vcc->flags, sk->sk_err, | |
213 | sk_wmem_alloc_get(sk), sk->sk_sndbuf, | |
214 | sk_rmem_alloc_get(sk), sk->sk_rcvbuf, | |
215 | refcount_read(&sk->sk_refcnt)); | |
216 | } | |
217 | ||
218 | static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) | |
219 | { | |
220 | if (!vcc->dev) | |
221 | seq_printf(seq, sizeof(void *) == 4 ? | |
222 | "N/A@%pK%10s" : "N/A@%pK%2s", vcc, ""); | |
223 | else | |
224 | seq_printf(seq, "%3d %3d %5d ", | |
225 | vcc->dev->number, vcc->vpi, vcc->vci); | |
226 | seq_printf(seq, "%-10s ", vcc_state(vcc)); | |
227 | seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, | |
228 | *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); | |
229 | if (*vcc->remote.sas_addr.prv) { | |
230 | int i; | |
231 | ||
232 | for (i = 0; i < ATM_ESA_LEN; i++) | |
233 | seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); | |
234 | } | |
235 | seq_putc(seq, '\n'); | |
236 | } | |
237 | ||
238 | static int atm_dev_seq_show(struct seq_file *seq, void *v) | |
239 | { | |
240 | static char atm_dev_banner[] = | |
241 | "Itf Type ESI/\"MAC\"addr " | |
242 | "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; | |
243 | ||
244 | if (v == &atm_devs) | |
245 | seq_puts(seq, atm_dev_banner); | |
246 | else { | |
247 | struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); | |
248 | ||
249 | atm_dev_info(seq, dev); | |
250 | } | |
251 | return 0; | |
252 | } | |
253 | ||
254 | static const struct seq_operations atm_dev_seq_ops = { | |
255 | .start = atm_dev_seq_start, | |
256 | .next = atm_dev_seq_next, | |
257 | .stop = atm_dev_seq_stop, | |
258 | .show = atm_dev_seq_show, | |
259 | }; | |
260 | ||
261 | static int atm_dev_seq_open(struct inode *inode, struct file *file) | |
262 | { | |
263 | return seq_open(file, &atm_dev_seq_ops); | |
264 | } | |
265 | ||
266 | static const struct file_operations devices_seq_fops = { | |
267 | .open = atm_dev_seq_open, | |
268 | .read = seq_read, | |
269 | .llseek = seq_lseek, | |
270 | .release = seq_release, | |
271 | }; | |
272 | ||
273 | static int pvc_seq_show(struct seq_file *seq, void *v) | |
274 | { | |
275 | static char atm_pvc_banner[] = | |
276 | "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; | |
277 | ||
278 | if (v == SEQ_START_TOKEN) | |
279 | seq_puts(seq, atm_pvc_banner); | |
280 | else { | |
281 | struct vcc_state *state = seq->private; | |
282 | struct atm_vcc *vcc = atm_sk(state->sk); | |
283 | ||
284 | pvc_info(seq, vcc); | |
285 | } | |
286 | return 0; | |
287 | } | |
288 | ||
289 | static const struct seq_operations pvc_seq_ops = { | |
290 | .start = vcc_seq_start, | |
291 | .next = vcc_seq_next, | |
292 | .stop = vcc_seq_stop, | |
293 | .show = pvc_seq_show, | |
294 | }; | |
295 | ||
296 | static int pvc_seq_open(struct inode *inode, struct file *file) | |
297 | { | |
298 | return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops); | |
299 | } | |
300 | ||
301 | static const struct file_operations pvc_seq_fops = { | |
302 | .open = pvc_seq_open, | |
303 | .read = seq_read, | |
304 | .llseek = seq_lseek, | |
305 | .release = seq_release_private, | |
306 | }; | |
307 | ||
308 | static int vcc_seq_show(struct seq_file *seq, void *v) | |
309 | { | |
310 | if (v == SEQ_START_TOKEN) { | |
311 | seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", | |
312 | "Address ", "Itf VPI VCI Fam Flags Reply " | |
313 | "Send buffer Recv buffer [refcnt]\n"); | |
314 | } else { | |
315 | struct vcc_state *state = seq->private; | |
316 | struct atm_vcc *vcc = atm_sk(state->sk); | |
317 | ||
318 | vcc_info(seq, vcc); | |
319 | } | |
320 | return 0; | |
321 | } | |
322 | ||
323 | static const struct seq_operations vcc_seq_ops = { | |
324 | .start = vcc_seq_start, | |
325 | .next = vcc_seq_next, | |
326 | .stop = vcc_seq_stop, | |
327 | .show = vcc_seq_show, | |
328 | }; | |
329 | ||
330 | static int vcc_seq_open(struct inode *inode, struct file *file) | |
331 | { | |
332 | return __vcc_seq_open(inode, file, 0, &vcc_seq_ops); | |
333 | } | |
334 | ||
335 | static const struct file_operations vcc_seq_fops = { | |
336 | .open = vcc_seq_open, | |
337 | .read = seq_read, | |
338 | .llseek = seq_lseek, | |
339 | .release = seq_release_private, | |
340 | }; | |
341 | ||
342 | static int svc_seq_show(struct seq_file *seq, void *v) | |
343 | { | |
344 | static const char atm_svc_banner[] = | |
345 | "Itf VPI VCI State Remote\n"; | |
346 | ||
347 | if (v == SEQ_START_TOKEN) | |
348 | seq_puts(seq, atm_svc_banner); | |
349 | else { | |
350 | struct vcc_state *state = seq->private; | |
351 | struct atm_vcc *vcc = atm_sk(state->sk); | |
352 | ||
353 | svc_info(seq, vcc); | |
354 | } | |
355 | return 0; | |
356 | } | |
357 | ||
358 | static const struct seq_operations svc_seq_ops = { | |
359 | .start = vcc_seq_start, | |
360 | .next = vcc_seq_next, | |
361 | .stop = vcc_seq_stop, | |
362 | .show = svc_seq_show, | |
363 | }; | |
364 | ||
365 | static int svc_seq_open(struct inode *inode, struct file *file) | |
366 | { | |
367 | return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops); | |
368 | } | |
369 | ||
370 | static const struct file_operations svc_seq_fops = { | |
371 | .open = svc_seq_open, | |
372 | .read = seq_read, | |
373 | .llseek = seq_lseek, | |
374 | .release = seq_release_private, | |
375 | }; | |
376 | ||
377 | static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, | |
378 | size_t count, loff_t *pos) | |
379 | { | |
380 | struct atm_dev *dev; | |
381 | unsigned long page; | |
382 | int length; | |
383 | ||
384 | if (count == 0) | |
385 | return 0; | |
386 | page = get_zeroed_page(GFP_KERNEL); | |
387 | if (!page) | |
388 | return -ENOMEM; | |
389 | dev = PDE_DATA(file_inode(file)); | |
390 | if (!dev->ops->proc_read) | |
391 | length = -EINVAL; | |
392 | else { | |
393 | length = dev->ops->proc_read(dev, pos, (char *)page); | |
394 | if (length > count) | |
395 | length = -EINVAL; | |
396 | } | |
397 | if (length >= 0) { | |
398 | if (copy_to_user(buf, (char *)page, length)) | |
399 | length = -EFAULT; | |
400 | (*pos)++; | |
401 | } | |
402 | free_page(page); | |
403 | return length; | |
404 | } | |
405 | ||
406 | struct proc_dir_entry *atm_proc_root; | |
407 | EXPORT_SYMBOL(atm_proc_root); | |
408 | ||
409 | ||
410 | int atm_proc_dev_register(struct atm_dev *dev) | |
411 | { | |
412 | int error; | |
413 | ||
414 | /* No proc info */ | |
415 | if (!dev->ops->proc_read) | |
416 | return 0; | |
417 | ||
418 | error = -ENOMEM; | |
419 | dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number); | |
420 | if (!dev->proc_name) | |
421 | goto err_out; | |
422 | ||
423 | dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root, | |
424 | &proc_atm_dev_ops, dev); | |
425 | if (!dev->proc_entry) | |
426 | goto err_free_name; | |
427 | return 0; | |
428 | ||
429 | err_free_name: | |
430 | kfree(dev->proc_name); | |
431 | err_out: | |
432 | return error; | |
433 | } | |
434 | ||
435 | void atm_proc_dev_deregister(struct atm_dev *dev) | |
436 | { | |
437 | if (!dev->ops->proc_read) | |
438 | return; | |
439 | ||
440 | remove_proc_entry(dev->proc_name, atm_proc_root); | |
441 | kfree(dev->proc_name); | |
442 | } | |
443 | ||
444 | static struct atm_proc_entry { | |
445 | char *name; | |
446 | const struct file_operations *proc_fops; | |
447 | struct proc_dir_entry *dirent; | |
448 | } atm_proc_ents[] = { | |
449 | { .name = "devices", .proc_fops = &devices_seq_fops }, | |
450 | { .name = "pvc", .proc_fops = &pvc_seq_fops }, | |
451 | { .name = "svc", .proc_fops = &svc_seq_fops }, | |
452 | { .name = "vc", .proc_fops = &vcc_seq_fops }, | |
453 | { .name = NULL, .proc_fops = NULL } | |
454 | }; | |
455 | ||
456 | static void atm_proc_dirs_remove(void) | |
457 | { | |
458 | static struct atm_proc_entry *e; | |
459 | ||
460 | for (e = atm_proc_ents; e->name; e++) { | |
461 | if (e->dirent) | |
462 | remove_proc_entry(e->name, atm_proc_root); | |
463 | } | |
464 | remove_proc_entry("atm", init_net.proc_net); | |
465 | } | |
466 | ||
467 | int __init atm_proc_init(void) | |
468 | { | |
469 | static struct atm_proc_entry *e; | |
470 | int ret; | |
471 | ||
472 | atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); | |
473 | if (!atm_proc_root) | |
474 | goto err_out; | |
475 | for (e = atm_proc_ents; e->name; e++) { | |
476 | struct proc_dir_entry *dirent; | |
477 | ||
478 | dirent = proc_create(e->name, S_IRUGO, | |
479 | atm_proc_root, e->proc_fops); | |
480 | if (!dirent) | |
481 | goto err_out_remove; | |
482 | e->dirent = dirent; | |
483 | } | |
484 | ret = 0; | |
485 | out: | |
486 | return ret; | |
487 | ||
488 | err_out_remove: | |
489 | atm_proc_dirs_remove(); | |
490 | err_out: | |
491 | ret = -ENOMEM; | |
492 | goto out; | |
493 | } | |
494 | ||
495 | void atm_proc_exit(void) | |
496 | { | |
497 | atm_proc_dirs_remove(); | |
498 | } |