xref: /openbmc/linux/net/atm/proc.c (revision b6dcefde)
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 <net/net_namespace.h>
26 #include <net/atmclip.h>
27 #include <asm/uaccess.h>
28 #include <asm/atomic.h>
29 #include <asm/param.h> /* for HZ */
30 #include "resources.h"
31 #include "common.h" /* atm_proc_init prototype */
32 #include "signaling.h" /* to get sigd - ugly too */
33 
34 static ssize_t proc_dev_atm_read(struct file *file,char __user *buf,size_t count,
35     loff_t *pos);
36 
37 static const struct file_operations proc_atm_dev_ops = {
38 	.owner =	THIS_MODULE,
39 	.read =		proc_dev_atm_read,
40 };
41 
42 static void add_stats(struct seq_file *seq, const char *aal,
43   const struct k_atm_aal_stats *stats)
44 {
45 	seq_printf(seq, "%s ( %d %d %d %d %d )", aal,
46 	    atomic_read(&stats->tx),atomic_read(&stats->tx_err),
47 	    atomic_read(&stats->rx),atomic_read(&stats->rx_err),
48 	    atomic_read(&stats->rx_drop));
49 }
50 
51 static void atm_dev_info(struct seq_file *seq, const struct atm_dev *dev)
52 {
53 	int i;
54 
55 	seq_printf(seq, "%3d %-8s", dev->number, dev->type);
56 	for (i = 0; i < ESI_LEN; i++)
57 		seq_printf(seq, "%02x", dev->esi[i]);
58 	seq_puts(seq, "  ");
59 	add_stats(seq, "0", &dev->stats.aal0);
60 	seq_puts(seq, "  ");
61 	add_stats(seq, "5", &dev->stats.aal5);
62 	seq_printf(seq, "\t[%d]", atomic_read(&dev->refcnt));
63 	seq_putc(seq, '\n');
64 }
65 
66 struct vcc_state {
67 	int bucket;
68 	struct sock *sk;
69 	int family;
70 };
71 
72 static inline int compare_family(struct sock *sk, int family)
73 {
74 	return !family || (sk->sk_family == family);
75 }
76 
77 static int __vcc_walk(struct sock **sock, int family, int *bucket, loff_t l)
78 {
79 	struct sock *sk = *sock;
80 
81 	if (sk == SEQ_START_TOKEN) {
82 		for (*bucket = 0; *bucket < VCC_HTABLE_SIZE; ++*bucket) {
83 			struct hlist_head *head = &vcc_hash[*bucket];
84 
85 			sk = hlist_empty(head) ? NULL : __sk_head(head);
86 			if (sk)
87 				break;
88 		}
89 		l--;
90 	}
91 try_again:
92 	for (; sk; sk = sk_next(sk)) {
93 		l -= compare_family(sk, family);
94 		if (l < 0)
95 			goto out;
96 	}
97 	if (!sk && ++*bucket < VCC_HTABLE_SIZE) {
98 		sk = sk_head(&vcc_hash[*bucket]);
99 		goto try_again;
100 	}
101 	sk = SEQ_START_TOKEN;
102 out:
103 	*sock = sk;
104 	return (l < 0);
105 }
106 
107 static inline void *vcc_walk(struct vcc_state *state, loff_t l)
108 {
109 	return __vcc_walk(&state->sk, state->family, &state->bucket, l) ?
110 	       state : NULL;
111 }
112 
113 static int __vcc_seq_open(struct inode *inode, struct file *file,
114 	int family, const struct seq_operations *ops)
115 {
116 	struct vcc_state *state;
117 
118 	state = __seq_open_private(file, ops, sizeof(*state));
119 	if (state == NULL)
120 		return -ENOMEM;
121 
122 	state->family = family;
123 	return 0;
124 }
125 
126 static void *vcc_seq_start(struct seq_file *seq, loff_t *pos)
127 	__acquires(vcc_sklist_lock)
128 {
129 	struct vcc_state *state = seq->private;
130 	loff_t left = *pos;
131 
132 	read_lock(&vcc_sklist_lock);
133 	state->sk = SEQ_START_TOKEN;
134 	return left ? vcc_walk(state, left) : SEQ_START_TOKEN;
135 }
136 
137 static void vcc_seq_stop(struct seq_file *seq, void *v)
138 	__releases(vcc_sklist_lock)
139 {
140 	read_unlock(&vcc_sklist_lock);
141 }
142 
143 static void *vcc_seq_next(struct seq_file *seq, void *v, loff_t *pos)
144 {
145 	struct vcc_state *state = seq->private;
146 
147 	v = vcc_walk(state, 1);
148 	*pos += !!PTR_ERR(v);
149 	return v;
150 }
151 
152 static void pvc_info(struct seq_file *seq, struct atm_vcc *vcc)
153 {
154 	static const char *const class_name[] =
155 		{"off","UBR","CBR","VBR","ABR"};
156 	static const char *const aal_name[] = {
157 		"---",	"1",	"2",	"3/4",	/*  0- 3 */
158 		"???",	"5",	"???",	"???",	/*  4- 7 */
159 		"???",	"???",	"???",	"???",	/*  8-11 */
160 		"???",	"0",	"???",	"???"};	/* 12-15 */
161 
162 	seq_printf(seq, "%3d %3d %5d %-3s %7d %-5s %7d %-6s",
163 	    vcc->dev->number,vcc->vpi,vcc->vci,
164 	    vcc->qos.aal >= ARRAY_SIZE(aal_name) ? "err" :
165 	    aal_name[vcc->qos.aal],vcc->qos.rxtp.min_pcr,
166 	    class_name[vcc->qos.rxtp.traffic_class],vcc->qos.txtp.min_pcr,
167 	    class_name[vcc->qos.txtp.traffic_class]);
168 	if (test_bit(ATM_VF_IS_CLIP, &vcc->flags)) {
169 		struct clip_vcc *clip_vcc = CLIP_VCC(vcc);
170 		struct net_device *dev;
171 
172 		dev = clip_vcc->entry ? clip_vcc->entry->neigh->dev : NULL;
173 		seq_printf(seq, "CLIP, Itf:%s, Encap:",
174 		    dev ? dev->name : "none?");
175 		seq_printf(seq, "%s", clip_vcc->encap ? "LLC/SNAP" : "None");
176 	}
177 	seq_putc(seq, '\n');
178 }
179 
180 static const char *vcc_state(struct atm_vcc *vcc)
181 {
182 	static const char *const map[] = { ATM_VS2TXT_MAP };
183 
184 	return map[ATM_VF2VS(vcc->flags)];
185 }
186 
187 static void vcc_info(struct seq_file *seq, struct atm_vcc *vcc)
188 {
189 	struct sock *sk = sk_atm(vcc);
190 
191 	seq_printf(seq, "%p ", vcc);
192 	if (!vcc->dev)
193 		seq_printf(seq, "Unassigned    ");
194 	else
195 		seq_printf(seq, "%3d %3d %5d ", vcc->dev->number, vcc->vpi,
196 			vcc->vci);
197 	switch (sk->sk_family) {
198 		case AF_ATMPVC:
199 			seq_printf(seq, "PVC");
200 			break;
201 		case AF_ATMSVC:
202 			seq_printf(seq, "SVC");
203 			break;
204 		default:
205 			seq_printf(seq, "%3d", sk->sk_family);
206 	}
207 	seq_printf(seq, " %04lx  %5d %7d/%7d %7d/%7d [%d]\n", vcc->flags, sk->sk_err,
208 		  sk_wmem_alloc_get(sk), sk->sk_sndbuf,
209 		  sk_rmem_alloc_get(sk), sk->sk_rcvbuf,
210 		  atomic_read(&sk->sk_refcnt));
211 }
212 
213 static void svc_info(struct seq_file *seq, struct atm_vcc *vcc)
214 {
215 	if (!vcc->dev)
216 		seq_printf(seq, sizeof(void *) == 4 ?
217 			   "N/A@%p%10s" : "N/A@%p%2s", vcc, "");
218 	else
219 		seq_printf(seq, "%3d %3d %5d         ",
220 			   vcc->dev->number, vcc->vpi, vcc->vci);
221 	seq_printf(seq, "%-10s ", vcc_state(vcc));
222 	seq_printf(seq, "%s%s", vcc->remote.sas_addr.pub,
223 	    *vcc->remote.sas_addr.pub && *vcc->remote.sas_addr.prv ? "+" : "");
224 	if (*vcc->remote.sas_addr.prv) {
225 		int i;
226 
227 		for (i = 0; i < ATM_ESA_LEN; i++)
228 			seq_printf(seq, "%02x", vcc->remote.sas_addr.prv[i]);
229 	}
230 	seq_putc(seq, '\n');
231 }
232 
233 static int atm_dev_seq_show(struct seq_file *seq, void *v)
234 {
235 	static char atm_dev_banner[] =
236 		"Itf Type    ESI/\"MAC\"addr "
237 		"AAL(TX,err,RX,err,drop) ...               [refcnt]\n";
238 
239 	if (v == SEQ_START_TOKEN)
240 		seq_puts(seq, atm_dev_banner);
241 	else {
242 		struct atm_dev *dev = list_entry(v, struct atm_dev, dev_list);
243 
244 		atm_dev_info(seq, dev);
245 	}
246 	return 0;
247 }
248 
249 static const struct seq_operations atm_dev_seq_ops = {
250 	.start	= atm_dev_seq_start,
251 	.next	= atm_dev_seq_next,
252 	.stop	= atm_dev_seq_stop,
253 	.show	= atm_dev_seq_show,
254 };
255 
256 static int atm_dev_seq_open(struct inode *inode, struct file *file)
257 {
258 	return seq_open(file, &atm_dev_seq_ops);
259 }
260 
261 static const struct file_operations devices_seq_fops = {
262 	.open		= atm_dev_seq_open,
263 	.read		= seq_read,
264 	.llseek		= seq_lseek,
265 	.release	= seq_release,
266 };
267 
268 static int pvc_seq_show(struct seq_file *seq, void *v)
269 {
270 	static char atm_pvc_banner[] =
271 		"Itf VPI VCI   AAL RX(PCR,Class) TX(PCR,Class)\n";
272 
273 	if (v == SEQ_START_TOKEN)
274 		seq_puts(seq, atm_pvc_banner);
275 	else {
276 		struct vcc_state *state = seq->private;
277 		struct atm_vcc *vcc = atm_sk(state->sk);
278 
279 		pvc_info(seq, vcc);
280 	}
281 	return 0;
282 }
283 
284 static const struct seq_operations pvc_seq_ops = {
285 	.start	= vcc_seq_start,
286 	.next	= vcc_seq_next,
287 	.stop	= vcc_seq_stop,
288 	.show	= pvc_seq_show,
289 };
290 
291 static int pvc_seq_open(struct inode *inode, struct file *file)
292 {
293 	return __vcc_seq_open(inode, file, PF_ATMPVC, &pvc_seq_ops);
294 }
295 
296 static const struct file_operations pvc_seq_fops = {
297 	.open		= pvc_seq_open,
298 	.read		= seq_read,
299 	.llseek		= seq_lseek,
300 	.release	= seq_release_private,
301 };
302 
303 static int vcc_seq_show(struct seq_file *seq, void *v)
304 {
305 	if (v == SEQ_START_TOKEN) {
306 		seq_printf(seq, sizeof(void *) == 4 ? "%-8s%s" : "%-16s%s",
307 			"Address ", "Itf VPI VCI   Fam Flags Reply "
308 			"Send buffer     Recv buffer      [refcnt]\n");
309 	} else {
310 		struct vcc_state *state = seq->private;
311 		struct atm_vcc *vcc = atm_sk(state->sk);
312 
313 		vcc_info(seq, vcc);
314 	}
315 	return 0;
316 }
317 
318 static const struct seq_operations vcc_seq_ops = {
319 	.start	= vcc_seq_start,
320 	.next	= vcc_seq_next,
321 	.stop	= vcc_seq_stop,
322 	.show	= vcc_seq_show,
323 };
324 
325 static int vcc_seq_open(struct inode *inode, struct file *file)
326 {
327 	return __vcc_seq_open(inode, file, 0, &vcc_seq_ops);
328 }
329 
330 static const struct file_operations vcc_seq_fops = {
331 	.open		= vcc_seq_open,
332 	.read		= seq_read,
333 	.llseek		= seq_lseek,
334 	.release	= seq_release_private,
335 };
336 
337 static int svc_seq_show(struct seq_file *seq, void *v)
338 {
339 	static const char atm_svc_banner[] =
340 		"Itf VPI VCI           State      Remote\n";
341 
342 	if (v == SEQ_START_TOKEN)
343 		seq_puts(seq, atm_svc_banner);
344 	else {
345 		struct vcc_state *state = seq->private;
346 		struct atm_vcc *vcc = atm_sk(state->sk);
347 
348 		svc_info(seq, vcc);
349 	}
350 	return 0;
351 }
352 
353 static const struct seq_operations svc_seq_ops = {
354 	.start	= vcc_seq_start,
355 	.next	= vcc_seq_next,
356 	.stop	= vcc_seq_stop,
357 	.show	= svc_seq_show,
358 };
359 
360 static int svc_seq_open(struct inode *inode, struct file *file)
361 {
362 	return __vcc_seq_open(inode, file, PF_ATMSVC, &svc_seq_ops);
363 }
364 
365 static const struct file_operations svc_seq_fops = {
366 	.open		= svc_seq_open,
367 	.read		= seq_read,
368 	.llseek		= seq_lseek,
369 	.release	= seq_release_private,
370 };
371 
372 static ssize_t proc_dev_atm_read(struct file *file, char __user *buf,
373 				 size_t count, loff_t *pos)
374 {
375 	struct atm_dev *dev;
376 	unsigned long page;
377 	int length;
378 
379 	if (count == 0) return 0;
380 	page = get_zeroed_page(GFP_KERNEL);
381 	if (!page) return -ENOMEM;
382 	dev = PDE(file->f_path.dentry->d_inode)->data;
383 	if (!dev->ops->proc_read)
384 		length = -EINVAL;
385 	else {
386 		length = dev->ops->proc_read(dev,pos,(char *) page);
387 		if (length > count) length = -EINVAL;
388 	}
389 	if (length >= 0) {
390 		if (copy_to_user(buf,(char *) page,length)) length = -EFAULT;
391 		(*pos)++;
392 	}
393 	free_page(page);
394 	return length;
395 }
396 
397 
398 struct proc_dir_entry *atm_proc_root;
399 EXPORT_SYMBOL(atm_proc_root);
400 
401 
402 int atm_proc_dev_register(struct atm_dev *dev)
403 {
404 	int digits,num;
405 	int error;
406 
407 	/* No proc info */
408 	if (!dev->ops->proc_read)
409 		return 0;
410 
411 	error = -ENOMEM;
412 	digits = 0;
413 	for (num = dev->number; num; num /= 10) digits++;
414 	if (!digits) digits++;
415 
416 	dev->proc_name = kmalloc(strlen(dev->type) + digits + 2, GFP_KERNEL);
417 	if (!dev->proc_name)
418 		goto err_out;
419 	sprintf(dev->proc_name,"%s:%d",dev->type, dev->number);
420 
421 	dev->proc_entry = proc_create_data(dev->proc_name, 0, atm_proc_root,
422 					   &proc_atm_dev_ops, dev);
423 	if (!dev->proc_entry)
424 		goto err_free_name;
425 	return 0;
426 err_free_name:
427 	kfree(dev->proc_name);
428 err_out:
429 	return error;
430 }
431 
432 
433 void atm_proc_dev_deregister(struct atm_dev *dev)
434 {
435 	if (!dev->ops->proc_read)
436 		return;
437 
438 	remove_proc_entry(dev->proc_name, atm_proc_root);
439 	kfree(dev->proc_name);
440 }
441 
442 static struct atm_proc_entry {
443 	char *name;
444 	const struct file_operations *proc_fops;
445 	struct proc_dir_entry *dirent;
446 } atm_proc_ents[] = {
447 	{ .name = "devices",	.proc_fops = &devices_seq_fops },
448 	{ .name = "pvc",	.proc_fops = &pvc_seq_fops },
449 	{ .name = "svc",	.proc_fops = &svc_seq_fops },
450 	{ .name = "vc",		.proc_fops = &vcc_seq_fops },
451 	{ .name = NULL,		.proc_fops = NULL }
452 };
453 
454 static void atm_proc_dirs_remove(void)
455 {
456 	static struct atm_proc_entry *e;
457 
458 	for (e = atm_proc_ents; e->name; e++) {
459 		if (e->dirent)
460 			remove_proc_entry(e->name, atm_proc_root);
461 	}
462 	proc_net_remove(&init_net, "atm");
463 }
464 
465 int __init atm_proc_init(void)
466 {
467 	static struct atm_proc_entry *e;
468 	int ret;
469 
470 	atm_proc_root = proc_net_mkdir(&init_net, "atm", init_net.proc_net);
471 	if (!atm_proc_root)
472 		goto err_out;
473 	for (e = atm_proc_ents; e->name; e++) {
474 		struct proc_dir_entry *dirent;
475 
476 		dirent = proc_create(e->name, S_IRUGO,
477 				     atm_proc_root, e->proc_fops);
478 		if (!dirent)
479 			goto err_out_remove;
480 		e->dirent = dirent;
481 	}
482 	ret = 0;
483 out:
484 	return ret;
485 
486 err_out_remove:
487 	atm_proc_dirs_remove();
488 err_out:
489 	ret = -ENOMEM;
490 	goto out;
491 }
492 
493 void atm_proc_exit(void)
494 {
495 	atm_proc_dirs_remove();
496 }
497