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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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 | ||
1da177e4 LT |
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 */ | |
5a0e3ad6 | 26 | #include <linux/slab.h> |
457c4cbc | 27 | #include <net/net_namespace.h> |
1da177e4 | 28 | #include <net/atmclip.h> |
07367adb JP |
29 | #include <linux/uaccess.h> |
30 | #include <linux/param.h> /* for HZ */ | |
60063497 | 31 | #include <linux/atomic.h> |
1da177e4 LT |
32 | #include "resources.h" |
33 | #include "common.h" /* atm_proc_init prototype */ | |
34 | #include "signaling.h" /* to get sigd - ugly too */ | |
35 | ||
07367adb JP |
36 | static ssize_t proc_dev_atm_read(struct file *file, char __user *buf, |
37 | size_t count, loff_t *pos); | |
1da177e4 | 38 | |
9a32144e | 39 | static const struct file_operations proc_atm_dev_ops = { |
1da177e4 LT |
40 | .owner = THIS_MODULE, |
41 | .read = proc_dev_atm_read, | |
6038f373 | 42 | .llseek = noop_llseek, |
1da177e4 LT |
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, | |
07367adb JP |
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)); | |
1da177e4 LT |
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); | |
458bc30c | 65 | seq_printf(seq, "\t[%d]", refcount_read(&dev->refcnt)); |
1da177e4 LT |
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 | ||
2e1e9848 | 84 | if (sk == SEQ_START_TOKEN) { |
1da177e4 LT |
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--; | |
f7d57453 | 93 | } |
1da177e4 LT |
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 | } | |
2e1e9848 | 104 | sk = SEQ_START_TOKEN; |
1da177e4 LT |
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, | |
ececfdee | 117 | int family, const struct seq_operations *ops) |
1da177e4 LT |
118 | { |
119 | struct vcc_state *state; | |
1da177e4 | 120 | |
9a8c09e7 PE |
121 | state = __seq_open_private(file, ops, sizeof(*state)); |
122 | if (state == NULL) | |
123 | return -ENOMEM; | |
1da177e4 LT |
124 | |
125 | state->family = family; | |
9a8c09e7 | 126 | return 0; |
1da177e4 LT |
127 | } |
128 | ||
129 | static void *vcc_seq_start(struct seq_file *seq, loff_t *pos) | |
5c17d5f1 | 130 | __acquires(vcc_sklist_lock) |
1da177e4 LT |
131 | { |
132 | struct vcc_state *state = seq->private; | |
133 | loff_t left = *pos; | |
134 | ||
135 | read_lock(&vcc_sklist_lock); | |
2e1e9848 JP |
136 | state->sk = SEQ_START_TOKEN; |
137 | return left ? vcc_walk(state, left) : SEQ_START_TOKEN; | |
1da177e4 LT |
138 | } |
139 | ||
140 | static void vcc_seq_stop(struct seq_file *seq, void *v) | |
5c17d5f1 | 141 | __releases(vcc_sklist_lock) |
1da177e4 LT |
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 | { | |
07367adb JP |
157 | static const char *const class_name[] = { |
158 | "off", "UBR", "CBR", "VBR", "ABR"}; | |
36cbd3dc | 159 | static const char *const aal_name[] = { |
1da177e4 LT |
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", | |
07367adb JP |
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]); | |
1da177e4 LT |
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 | { | |
36cbd3dc | 186 | static const char *const map[] = { ATM_VS2TXT_MAP }; |
1da177e4 LT |
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 | ||
71338aa7 | 195 | seq_printf(seq, "%pK ", vcc); |
1da177e4 LT |
196 | if (!vcc->dev) |
197 | seq_printf(seq, "Unassigned "); | |
f7d57453 | 198 | else |
1da177e4 LT |
199 | seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi, |
200 | vcc->vci); | |
201 | switch (sk->sk_family) { | |
07367adb JP |
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); | |
1da177e4 | 210 | } |
07367adb JP |
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, | |
41c6d650 | 215 | refcount_read(&sk->sk_refcnt)); |
1da177e4 LT |
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 ? | |
71338aa7 | 222 | "N/A@%pK%10s" : "N/A@%pK%2s", vcc, ""); |
1da177e4 LT |
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"; | |
f7d57453 | 243 | |
67de7924 | 244 | if (v == &atm_devs) |
1da177e4 LT |
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 | } | |
f7d57453 | 251 | return 0; |
1da177e4 | 252 | } |
f7d57453 | 253 | |
56b3d975 | 254 | static const struct seq_operations atm_dev_seq_ops = { |
1da177e4 LT |
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 | }; | |
f7d57453 | 260 | |
1da177e4 LT |
261 | static int atm_dev_seq_open(struct inode *inode, struct file *file) |
262 | { | |
263 | return seq_open(file, &atm_dev_seq_ops); | |
264 | } | |
f7d57453 | 265 | |
9a32144e | 266 | static const struct file_operations devices_seq_fops = { |
1da177e4 LT |
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 | { | |
f7d57453 | 275 | static char atm_pvc_banner[] = |
1da177e4 LT |
276 | "Itf VPI VCI AAL RX(PCR,Class) TX(PCR,Class)\n"; |
277 | ||
2e1e9848 | 278 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
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 | ||
56b3d975 | 289 | static const struct seq_operations pvc_seq_ops = { |
1da177e4 LT |
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 | ||
9a32144e | 301 | static const struct file_operations pvc_seq_fops = { |
1da177e4 LT |
302 | .open = pvc_seq_open, |
303 | .read = seq_read, | |
304 | .llseek = seq_lseek, | |
9a8c09e7 | 305 | .release = seq_release_private, |
1da177e4 LT |
306 | }; |
307 | ||
308 | static int vcc_seq_show(struct seq_file *seq, void *v) | |
309 | { | |
2e1e9848 | 310 | if (v == SEQ_START_TOKEN) { |
f7d57453 YH |
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; | |
1da177e4 | 321 | } |
f7d57453 | 322 | |
56b3d975 | 323 | static const struct seq_operations vcc_seq_ops = { |
f7d57453 YH |
324 | .start = vcc_seq_start, |
325 | .next = vcc_seq_next, | |
326 | .stop = vcc_seq_stop, | |
327 | .show = vcc_seq_show, | |
1da177e4 | 328 | }; |
f7d57453 | 329 | |
1da177e4 LT |
330 | static int vcc_seq_open(struct inode *inode, struct file *file) |
331 | { | |
f7d57453 | 332 | return __vcc_seq_open(inode, file, 0, &vcc_seq_ops); |
1da177e4 | 333 | } |
f7d57453 | 334 | |
9a32144e | 335 | static const struct file_operations vcc_seq_fops = { |
1da177e4 LT |
336 | .open = vcc_seq_open, |
337 | .read = seq_read, | |
338 | .llseek = seq_lseek, | |
9a8c09e7 | 339 | .release = seq_release_private, |
1da177e4 LT |
340 | }; |
341 | ||
342 | static int svc_seq_show(struct seq_file *seq, void *v) | |
343 | { | |
36cbd3dc | 344 | static const char atm_svc_banner[] = |
1da177e4 LT |
345 | "Itf VPI VCI State Remote\n"; |
346 | ||
2e1e9848 | 347 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
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 | ||
56b3d975 | 358 | static const struct seq_operations svc_seq_ops = { |
1da177e4 LT |
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 | ||
9a32144e | 370 | static const struct file_operations svc_seq_fops = { |
1da177e4 LT |
371 | .open = svc_seq_open, |
372 | .read = seq_read, | |
373 | .llseek = seq_lseek, | |
9a8c09e7 | 374 | .release = seq_release_private, |
1da177e4 LT |
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 | ||
07367adb JP |
384 | if (count == 0) |
385 | return 0; | |
1da177e4 | 386 | page = get_zeroed_page(GFP_KERNEL); |
07367adb JP |
387 | if (!page) |
388 | return -ENOMEM; | |
d9dda78b | 389 | dev = PDE_DATA(file_inode(file)); |
1da177e4 LT |
390 | if (!dev->ops->proc_read) |
391 | length = -EINVAL; | |
392 | else { | |
07367adb JP |
393 | length = dev->ops->proc_read(dev, pos, (char *)page); |
394 | if (length > count) | |
395 | length = -EINVAL; | |
1da177e4 LT |
396 | } |
397 | if (length >= 0) { | |
07367adb JP |
398 | if (copy_to_user(buf, (char *)page, length)) |
399 | length = -EFAULT; | |
1da177e4 LT |
400 | (*pos)++; |
401 | } | |
402 | free_page(page); | |
403 | return length; | |
404 | } | |
405 | ||
1da177e4 LT |
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 | { | |
1da177e4 LT |
412 | int error; |
413 | ||
414 | /* No proc info */ | |
415 | if (!dev->ops->proc_read) | |
416 | return 0; | |
417 | ||
418 | error = -ENOMEM; | |
62c97ac0 | 419 | dev->proc_name = kasprintf(GFP_KERNEL, "%s:%d", dev->type, dev->number); |
1da177e4 LT |
420 | if (!dev->proc_name) |
421 | goto err_out; | |
1da177e4 | 422 | |
0c89652a DL |
423 | dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root, |
424 | &proc_atm_dev_ops, dev); | |
1da177e4 LT |
425 | if (!dev->proc_entry) |
426 | goto err_free_name; | |
1da177e4 | 427 | return 0; |
07367adb | 428 | |
1da177e4 LT |
429 | err_free_name: |
430 | kfree(dev->proc_name); | |
431 | err_out: | |
432 | return error; | |
433 | } | |
434 | ||
1da177e4 LT |
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; | |
9a32144e | 446 | const struct file_operations *proc_fops; |
1da177e4 LT |
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++) { | |
f7d57453 | 461 | if (e->dirent) |
1da177e4 LT |
462 | remove_proc_entry(e->name, atm_proc_root); |
463 | } | |
ece31ffd | 464 | remove_proc_entry("atm", init_net.proc_net); |
1da177e4 LT |
465 | } |
466 | ||
467 | int __init atm_proc_init(void) | |
468 | { | |
469 | static struct atm_proc_entry *e; | |
470 | int ret; | |
471 | ||
e5d69b9f | 472 | atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net); |
1da177e4 LT |
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 | ||
16e297b3 WC |
478 | dirent = proc_create(e->name, S_IRUGO, |
479 | atm_proc_root, e->proc_fops); | |
1da177e4 LT |
480 | if (!dirent) |
481 | goto err_out_remove; | |
1da177e4 LT |
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 | ||
b9c6e3e9 | 495 | void atm_proc_exit(void) |
1da177e4 LT |
496 | { |
497 | atm_proc_dirs_remove(); | |
498 | } |