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1 | /* net/atm/proc.c - ATM /proc interface |
2 | * |
3 | * Written 1995-2000 by Werner Almesberger, EPFL LRC/ICA |
4 | * |
5 | * seq_file api usage by romieu@fr.zoreil.com |
6 | * |
7 | * Evaluating the efficiency of the whole thing if left as an exercise to |
8 | * the reader. |
9 | */ |
10 | |
11 | #include <linux/module.h> /* for EXPORT_SYMBOL */ |
12 | #include <linux/string.h> |
13 | #include <linux/types.h> |
14 | #include <linux/mm.h> |
15 | #include <linux/fs.h> |
16 | #include <linux/stat.h> |
17 | #include <linux/proc_fs.h> |
18 | #include <linux/seq_file.h> |
19 | #include <linux/errno.h> |
20 | #include <linux/atm.h> |
21 | #include <linux/atmdev.h> |
22 | #include <linux/netdevice.h> |
23 | #include <linux/atmclip.h> |
24 | #include <linux/init.h> /* for __init */ |
25 | #include <linux/slab.h> |
26 | #include <net/net_namespace.h> |
27 | #include <net/atmclip.h> |
28 | #include <linux/uaccess.h> |
29 | #include <linux/param.h> /* for HZ */ |
30 | #include <asm/atomic.h> |
31 | #include "resources.h" |
32 | #include "common.h" /* atm_proc_init prototype */ |
33 | #include "signaling.h" /* to get sigd - ugly too */ |
34 | |
35 | static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, |
36 | size_t count, loff_t *pos); |
37 | |
38 | static const struct file_operations proc_atm_dev_ops = { |
39 | .owner = THIS_MODULE, |
40 | .read = proc_dev_atm_read, |
41 | }; |
42 | |
43 | static void add_stats(struct seq_file *seq, const char *aal, |
44 | const struct k_atm_aal_stats *stats) |
45 | { |
46 | seq_printf(seq, "%s ( %d %d %d %d %d )", aal, |
47 | atomic_read(&stats->tx), atomic_read(&stats->tx_err), |
48 | atomic_read(&stats->rx), atomic_read(&stats->rx_err), |
49 | atomic_read(&stats->rx_drop)); |
50 | } |
51 | |
52 | static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev) |
53 | { |
54 | int i; |
55 | |
56 | seq_printf(seq, "%3d %-8s", dev->number, dev->type); |
57 | for (i = 0; i < ESI_LEN; i++) |
58 | seq_printf(seq, "%02x", dev->esi[i]); |
59 | seq_puts(seq, " "); |
60 | add_stats(seq, "0", &dev->stats.aal0); |
61 | seq_puts(seq, " "); |
62 | add_stats(seq, "5", &dev->stats.aal5); |
63 | seq_printf(seq, "\t[%d]", atomic_read(&dev->refcnt)); |
64 | seq_putc(seq, '\n'); |
65 | } |
66 | |
67 | struct vcc_state { |
68 | int bucket; |
69 | struct sock *sk; |
70 | int family; |
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 vcc_state *state, loff_t l) |
109 | { |
110 | return __vcc_walk(&state->sk, state->family, &state->bucket, l) ? |
111 | state : NULL; |
112 | } |
113 | |
114 | static int __vcc_seq_open(struct inode *inode, struct file *file, |
115 | int family, const struct seq_operations *ops) |
116 | { |
117 | struct vcc_state *state; |
118 | |
119 | state = __seq_open_private(file, ops, sizeof(*state)); |
120 | if (state == NULL) |
121 | return -ENOMEM; |
122 | |
123 | state->family = family; |
124 | return 0; |
125 | } |
126 | |
127 | static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) |
128 | __acquires(vcc_sklist_lock) |
129 | { |
130 | struct vcc_state *state = seq->private; |
131 | loff_t left = *pos; |
132 | |
133 | read_lock(&vcc_sklist_lock); |
134 | state->sk = SEQ_START_TOKEN; |
135 | return left ? vcc_walk(state, left) : SEQ_START_TOKEN; |
136 | } |
137 | |
138 | static void vcc_seq_stop(struct seq_file *seq, void *v) |
139 | __releases(vcc_sklist_lock) |
140 | { |
141 | read_unlock(&vcc_sklist_lock); |
142 | } |
143 | |
144 | static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
145 | { |
146 | struct vcc_state *state = seq->private; |
147 | |
148 | v = vcc_walk(state, 1); |
149 | *pos += !!PTR_ERR(v); |
150 | return v; |
151 | } |
152 | |
153 | static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc) |
154 | { |
155 | static const char *const class_name[] = { |
156 | "off", "UBR", "CBR", "VBR", "ABR"}; |
157 | static const char *const aal_name[] = { |
158 | "---", "1", "2", "3/4", /* 0- 3 */ |
159 | "???", "5", "???", "???", /* 4- 7 */ |
160 | "???", "???", "???", "???", /* 8-11 */ |
161 | "???", "0", "???", "???"}; /* 12-15 */ |
162 | |
163 | seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s", |
164 | vcc->dev->number, vcc->vpi, vcc->vci, |
165 | vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" : |
166 | aal_name[vcc->qos.aal], vcc->qos.rxtp.min_pcr, |
167 | class_name[vcc->qos.rxtp.traffic_class], |
168 | vcc->qos.txtp.min_pcr, |
169 | class_name[vcc->qos.txtp.traffic_class]); |
170 | if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) { |
171 | struct clip_vcc *clip_vcc = CLIP_VCC(vcc); |
172 | struct net_device *dev; |
173 | |
174 | dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL; |
175 | seq_printf(seq, "CLIP, Itf:%s, Encap:", |
176 | dev ? dev->name : "none?"); |
177 | seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None"); |
178 | } |
179 | seq_putc(seq, '\n'); |
180 | } |
181 | |
182 | static const char *vcc_state(struct atm_vcc *vcc) |
183 | { |
184 | static const char *const map[] = { ATM_VS2TXT_MAP }; |
185 | |
186 | return map[ATM_VF2VS(vcc->flags)]; |
187 | } |
188 | |
189 | static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc) |
190 | { |
191 | struct sock *sk = sk_atm(vcc); |
192 | |
193 | seq_printf(seq, "%p ", vcc); |
194 | if (!vcc->dev) |
195 | seq_printf(seq, "Unassigned "); |
196 | else |
197 | seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, |
198 | vcc->vci); |
199 | switch (sk->sk_family) { |
200 | case AF_ATMPVC: |
201 | seq_printf(seq, "PVC"); |
202 | break; |
203 | case AF_ATMSVC: |
204 | seq_printf(seq, "SVC"); |
205 | break; |
206 | default: |
207 | seq_printf(seq, "%3d", sk->sk_family); |
208 | } |
209 | seq_printf(seq, " %04lx %5d %7d/%7d %7d/%7d [%d]\n", |
210 | vcc->flags, sk->sk_err, |
211 | sk_wmem_alloc_get(sk), sk->sk_sndbuf, |
212 | sk_rmem_alloc_get(sk), sk->sk_rcvbuf, |
213 | atomic_read(&sk->sk_refcnt)); |
214 | } |
215 | |
216 | static void svc_info(struct seq_file *seq, struct atm_vcc *vcc) |
217 | { |
218 | if (!vcc->dev) |
219 | seq_printf(seq, sizeof(void *) == 4 ? |
220 | "N/A@%p%10s" : "N/A@%p%2s", vcc, ""); |
221 | else |
222 | seq_printf(seq, "%3d %3d %5d ", |
223 | vcc->dev->number, vcc->vpi, vcc->vci); |
224 | seq_printf(seq, "%-10s ", vcc_state(vcc)); |
225 | seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub, |
226 | *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : ""); |
227 | if (*vcc->remote.sas_addr.prv) { |
228 | int i; |
229 | |
230 | for (i = 0; i < ATM_ESA_LEN; i++) |
231 | seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]); |
232 | } |
233 | seq_putc(seq, '\n'); |
234 | } |
235 | |
236 | static int atm_dev_seq_show(struct seq_file *seq, void *v) |
237 | { |
238 | static char atm_dev_banner[] = |
239 | "Itf Type ESI/\"MAC\"addr " |
240 | "AAL(TX,err,RX,err,drop) ... [refcnt]\n"; |
241 | |
242 | if (v == &atm_devs) |
243 | seq_puts(seq, atm_dev_banner); |
244 | else { |
245 | struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list); |
246 | |
247 | atm_dev_info(seq, dev); |
248 | } |
249 | return 0; |
250 | } |
251 | |
252 | static const struct seq_operations atm_dev_seq_ops = { |
253 | .start = atm_dev_seq_start, |
254 | .next = atm_dev_seq_next, |
255 | .stop = atm_dev_seq_stop, |
256 | .show = atm_dev_seq_show, |
257 | }; |
258 | |
259 | static int atm_dev_seq_open(struct inode *inode, struct file *file) |
260 | { |
261 | return seq_open(file, &atm_dev_seq_ops); |
262 | } |
263 | |
264 | static const struct file_operations devices_seq_fops = { |
265 | .open = atm_dev_seq_open, |
266 | .read = seq_read, |
267 | .llseek = seq_lseek, |
268 | .release = seq_release, |
269 | }; |
270 | |
271 | static int pvc_seq_show(struct seq_file *seq, void *v) |
272 | { |
273 | static char atm_pvc_banner[] = |
274 | "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; |
275 | |
276 | if (v == SEQ_START_TOKEN) |
277 | seq_puts(seq, atm_pvc_banner); |
278 | else { |
279 | struct vcc_state *state = seq->private; |
280 | struct atm_vcc *vcc = atm_sk(state->sk); |
281 | |
282 | pvc_info(seq, vcc); |
283 | } |
284 | return 0; |
285 | } |
286 | |
287 | static const struct seq_operations pvc_seq_ops = { |
288 | .start = vcc_seq_start, |
289 | .next = vcc_seq_next, |
290 | .stop = vcc_seq_stop, |
291 | .show = pvc_seq_show, |
292 | }; |
293 | |
294 | static int pvc_seq_open(struct inode *inode, struct file *file) |
295 | { |
296 | return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops); |
297 | } |
298 | |
299 | static const struct file_operations pvc_seq_fops = { |
300 | .open = pvc_seq_open, |
301 | .read = seq_read, |
302 | .llseek = seq_lseek, |
303 | .release = seq_release_private, |
304 | }; |
305 | |
306 | static int vcc_seq_show(struct seq_file *seq, void *v) |
307 | { |
308 | if (v == SEQ_START_TOKEN) { |
309 | seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s", |
310 | "Address ", "Itf VPI VCI Fam Flags Reply " |
311 | "Send buffer Recv buffer [refcnt]\n"); |
312 | } else { |
313 | struct vcc_state *state = seq->private; |
314 | struct atm_vcc *vcc = atm_sk(state->sk); |
315 | |
316 | vcc_info(seq, vcc); |
317 | } |
318 | return 0; |
319 | } |
320 | |
321 | static const struct seq_operations vcc_seq_ops = { |
322 | .start = vcc_seq_start, |
323 | .next = vcc_seq_next, |
324 | .stop = vcc_seq_stop, |
325 | .show = vcc_seq_show, |
326 | }; |
327 | |
328 | static int vcc_seq_open(struct inode *inode, struct file *file) |
329 | { |
330 | return __vcc_seq_open(inode, file, 0, &vcc_seq_ops); |
331 | } |
332 | |
333 | static const struct file_operations vcc_seq_fops = { |
334 | .open = vcc_seq_open, |
335 | .read = seq_read, |
336 | .llseek = seq_lseek, |
337 | .release = seq_release_private, |
338 | }; |
339 | |
340 | static int svc_seq_show(struct seq_file *seq, void *v) |
341 | { |
342 | static const char atm_svc_banner[] = |
343 | "Itf VPI VCI State Remote\n"; |
344 | |
345 | if (v == SEQ_START_TOKEN) |
346 | seq_puts(seq, atm_svc_banner); |
347 | else { |
348 | struct vcc_state *state = seq->private; |
349 | struct atm_vcc *vcc = atm_sk(state->sk); |
350 | |
351 | svc_info(seq, vcc); |
352 | } |
353 | return 0; |
354 | } |
355 | |
356 | static const struct seq_operations svc_seq_ops = { |
357 | .start = vcc_seq_start, |
358 | .next = vcc_seq_next, |
359 | .stop = vcc_seq_stop, |
360 | .show = svc_seq_show, |
361 | }; |
362 | |
363 | static int svc_seq_open(struct inode *inode, struct file *file) |
364 | { |
365 | return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops); |
366 | } |
367 | |
368 | static const struct file_operations svc_seq_fops = { |
369 | .open = svc_seq_open, |
370 | .read = seq_read, |
371 | .llseek = seq_lseek, |
372 | .release = seq_release_private, |
373 | }; |
374 | |
375 | static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, |
376 | size_t count, loff_t *pos) |
377 | { |
378 | struct atm_dev *dev; |
379 | unsigned long page; |
380 | int length; |
381 | |
382 | if (count == 0) |
383 | return 0; |
384 | page = get_zeroed_page(GFP_KERNEL); |
385 | if (!page) |
386 | return -ENOMEM; |
387 | dev = PDE(file->f_path.dentry->d_inode)->data; |
388 | if (!dev->ops->proc_read) |
389 | length = -EINVAL; |
390 | else { |
391 | length = dev->ops->proc_read(dev, pos, (char *)page); |
392 | if (length > count) |
393 | length = -EINVAL; |
394 | } |
395 | if (length >= 0) { |
396 | if (copy_to_user(buf, (char *)page, length)) |
397 | length = -EFAULT; |
398 | (*pos)++; |
399 | } |
400 | free_page(page); |
401 | return length; |
402 | } |
403 | |
404 | struct proc_dir_entry *atm_proc_root; |
405 | EXPORT_SYMBOL(atm_proc_root); |
406 | |
407 | |
408 | int atm_proc_dev_register(struct atm_dev *dev) |
409 | { |
410 | int digits, num; |
411 | int error; |
412 | |
413 | /* No proc info */ |
414 | if (!dev->ops->proc_read) |
415 | return 0; |
416 | |
417 | error = -ENOMEM; |
418 | digits = 0; |
419 | for (num = dev->number; num; num /= 10) |
420 | digits++; |
421 | if (!digits) |
422 | digits++; |
423 | |
424 | dev->proc_name = kmalloc(strlen(dev->type) + digits + 2, GFP_KERNEL); |
425 | if (!dev->proc_name) |
426 | goto err_out; |
427 | sprintf(dev->proc_name, "%s:%d", dev->type, dev->number); |
428 | |
429 | dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root, |
430 | &proc_atm_dev_ops, dev); |
431 | if (!dev->proc_entry) |
432 | goto err_free_name; |
433 | return 0; |
434 | |
435 | err_free_name: |
436 | kfree(dev->proc_name); |
437 | err_out: |
438 | return error; |
439 | } |
440 | |
441 | void atm_proc_dev_deregister(struct atm_dev *dev) |
442 | { |
443 | if (!dev->ops->proc_read) |
444 | return; |
445 | |
446 | remove_proc_entry(dev->proc_name, atm_proc_root); |
447 | kfree(dev->proc_name); |
448 | } |
449 | |
450 | static struct atm_proc_entry { |
451 | char *name; |
452 | const struct file_operations *proc_fops; |
453 | struct proc_dir_entry *dirent; |
454 | } atm_proc_ents[] = { |
455 | { .name = "devices", .proc_fops = &devices_seq_fops }, |
456 | { .name = "pvc", .proc_fops = &pvc_seq_fops }, |
457 | { .name = "svc", .proc_fops = &svc_seq_fops }, |
458 | { .name = "vc", .proc_fops = &vcc_seq_fops }, |
459 | { .name = NULL, .proc_fops = NULL } |
460 | }; |
461 | |
462 | static void atm_proc_dirs_remove(void) |
463 | { |
464 | static struct atm_proc_entry *e; |
465 | |
466 | for (e = atm_proc_ents; e->name; e++) { |
467 | if (e->dirent) |
468 | remove_proc_entry(e->name, atm_proc_root); |
469 | } |
470 | proc_net_remove(&init_net, "atm"); |
471 | } |
472 | |
473 | int __init atm_proc_init(void) |
474 | { |
475 | static struct atm_proc_entry *e; |
476 | int ret; |
477 | |
478 | atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); |
479 | if (!atm_proc_root) |
480 | goto err_out; |
481 | for (e = atm_proc_ents; e->name; e++) { |
482 | struct proc_dir_entry *dirent; |
483 | |
484 | dirent = proc_create(e->name, S_IRUGO, |
485 | atm_proc_root, e->proc_fops); |
486 | if (!dirent) |
487 | goto err_out_remove; |
488 | e->dirent = dirent; |
489 | } |
490 | ret = 0; |
491 | out: |
492 | return ret; |
493 | |
494 | err_out_remove: |
495 | atm_proc_dirs_remove(); |
496 | err_out: |
497 | ret = -ENOMEM; |
498 | goto out; |
499 | } |
500 | |
501 | void atm_proc_exit(void) |
502 | { |
503 | atm_proc_dirs_remove(); |
504 | } |
505 |
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