summaryrefslogtreecommitdiff
path: root/net/core/net-procfs.c
blob: 09f7ed1a04e8ab881e461971e919728641927252 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
// SPDX-License-Identifier: GPL-2.0
#include <linux/netdevice.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <net/wext.h>

#include "dev.h"

#define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)

#define get_bucket(x) ((x) >> BUCKET_SPACE)
#define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
#define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))

static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos)
{
	struct net *net = seq_file_net(seq);
	struct net_device *dev;
	struct hlist_head *h;
	unsigned int count = 0, offset = get_offset(*pos);

	h = &net->dev_index_head[get_bucket(*pos)];
	hlist_for_each_entry_rcu(dev, h, index_hlist) {
		if (++count == offset)
			return dev;
	}

	return NULL;
}

static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos)
{
	struct net_device *dev;
	unsigned int bucket;

	do {
		dev = dev_from_same_bucket(seq, pos);
		if (dev)
			return dev;

		bucket = get_bucket(*pos) + 1;
		*pos = set_bucket_offset(bucket, 1);
	} while (bucket < NETDEV_HASHENTRIES);

	return NULL;
}

/*
 *	This is invoked by the /proc filesystem handler to display a device
 *	in detail.
 */
static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(RCU)
{
	rcu_read_lock();
	if (!*pos)
		return SEQ_START_TOKEN;

	if (get_bucket(*pos) >= NETDEV_HASHENTRIES)
		return NULL;

	return dev_from_bucket(seq, pos);
}

static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;
	return dev_from_bucket(seq, pos);
}

static void dev_seq_stop(struct seq_file *seq, void *v)
	__releases(RCU)
{
	rcu_read_unlock();
}

static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
{
	struct rtnl_link_stats64 temp;
	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);

	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
		   dev->name, stats->rx_bytes, stats->rx_packets,
		   stats->rx_errors,
		   stats->rx_dropped + stats->rx_missed_errors,
		   stats->rx_fifo_errors,
		   stats->rx_length_errors + stats->rx_over_errors +
		    stats->rx_crc_errors + stats->rx_frame_errors,
		   stats->rx_compressed, stats->multicast,
		   stats->tx_bytes, stats->tx_packets,
		   stats->tx_errors, stats->tx_dropped,
		   stats->tx_fifo_errors, stats->collisions,
		   stats->tx_carrier_errors +
		    stats->tx_aborted_errors +
		    stats->tx_window_errors +
		    stats->tx_heartbeat_errors,
		   stats->tx_compressed);
}

/*
 *	Called from the PROCfs module. This now uses the new arbitrary sized
 *	/proc/net interface to create /proc/net/dev
 */
static int dev_seq_show(struct seq_file *seq, void *v)
{
	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "Inter-|   Receive                            "
			      "                    |  Transmit\n"
			      " face |bytes    packets errs drop fifo frame "
			      "compressed multicast|bytes    packets errs "
			      "drop fifo colls carrier compressed\n");
	else
		dev_seq_printf_stats(seq, v);
	return 0;
}

static u32 softnet_input_pkt_queue_len(struct softnet_data *sd)
{
	return skb_queue_len_lockless(&sd->input_pkt_queue);
}

static u32 softnet_process_queue_len(struct softnet_data *sd)
{
	return skb_queue_len_lockless(&sd->process_queue);
}

static struct softnet_data *softnet_get_online(loff_t *pos)
{
	struct softnet_data *sd = NULL;

	while (*pos < nr_cpu_ids)
		if (cpu_online(*pos)) {
			sd = &per_cpu(softnet_data, *pos);
			break;
		} else
			++*pos;
	return sd;
}

static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
{
	return softnet_get_online(pos);
}

static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	++*pos;
	return softnet_get_online(pos);
}

static void softnet_seq_stop(struct seq_file *seq, void *v)
{
}

static int softnet_seq_show(struct seq_file *seq, void *v)
{
	struct softnet_data *sd = v;
	u32 input_qlen = softnet_input_pkt_queue_len(sd);
	u32 process_qlen = softnet_process_queue_len(sd);
	unsigned int flow_limit_count = 0;

#ifdef CONFIG_NET_FLOW_LIMIT
	struct sd_flow_limit *fl;

	rcu_read_lock();
	fl = rcu_dereference(sd->flow_limit);
	if (fl)
		flow_limit_count = fl->count;
	rcu_read_unlock();
#endif

	/* the index is the CPU id owing this sd. Since offline CPUs are not
	 * displayed, it would be othrwise not trivial for the user-space
	 * mapping the data a specific CPU
	 */
	seq_printf(seq,
		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
		   "%08x %08x\n",
		   sd->processed, sd->dropped, sd->time_squeeze, 0,
		   0, 0, 0, 0, /* was fastroute */
		   0,	/* was cpu_collision */
		   sd->received_rps, flow_limit_count,
		   input_qlen + process_qlen, (int)seq->index,
		   input_qlen, process_qlen);
	return 0;
}

static const struct seq_operations dev_seq_ops = {
	.start = dev_seq_start,
	.next  = dev_seq_next,
	.stop  = dev_seq_stop,
	.show  = dev_seq_show,
};

static const struct seq_operations softnet_seq_ops = {
	.start = softnet_seq_start,
	.next  = softnet_seq_next,
	.stop  = softnet_seq_stop,
	.show  = softnet_seq_show,
};

static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
{
	struct list_head *ptype_list = NULL;
	struct packet_type *pt = NULL;
	struct net_device *dev;
	loff_t i = 0;
	int t;

	for_each_netdev_rcu(seq_file_net(seq), dev) {
		ptype_list = &dev->ptype_all;
		list_for_each_entry_rcu(pt, ptype_list, list) {
			if (i == pos)
				return pt;
			++i;
		}
	}

	list_for_each_entry_rcu(pt, &ptype_all, list) {
		if (i == pos)
			return pt;
		++i;
	}

	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
		list_for_each_entry_rcu(pt, &ptype_base[t], list) {
			if (i == pos)
				return pt;
			++i;
		}
	}
	return NULL;
}

static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
	__acquires(RCU)
{
	rcu_read_lock();
	return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
}

static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
{
	struct net_device *dev;
	struct packet_type *pt;
	struct list_head *nxt;
	int hash;

	++*pos;
	if (v == SEQ_START_TOKEN)
		return ptype_get_idx(seq, 0);

	pt = v;
	nxt = pt->list.next;
	if (pt->dev) {
		if (nxt != &pt->dev->ptype_all)
			goto found;

		dev = pt->dev;
		for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
			if (!list_empty(&dev->ptype_all)) {
				nxt = dev->ptype_all.next;
				goto found;
			}
		}

		nxt = ptype_all.next;
		goto ptype_all;
	}

	if (pt->type == htons(ETH_P_ALL)) {
ptype_all:
		if (nxt != &ptype_all)
			goto found;
		hash = 0;
		nxt = ptype_base[0].next;
	} else
		hash = ntohs(pt->type) & PTYPE_HASH_MASK;

	while (nxt == &ptype_base[hash]) {
		if (++hash >= PTYPE_HASH_SIZE)
			return NULL;
		nxt = ptype_base[hash].next;
	}
found:
	return list_entry(nxt, struct packet_type, list);
}

static void ptype_seq_stop(struct seq_file *seq, void *v)
	__releases(RCU)
{
	rcu_read_unlock();
}

static int ptype_seq_show(struct seq_file *seq, void *v)
{
	struct packet_type *pt = v;

	if (v == SEQ_START_TOKEN)
		seq_puts(seq, "Type Device      Function\n");
	else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
		 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
		if (pt->type == htons(ETH_P_ALL))
			seq_puts(seq, "ALL ");
		else
			seq_printf(seq, "%04x", ntohs(pt->type));

		seq_printf(seq, " %-8s %ps\n",
			   pt->dev ? pt->dev->name : "", pt->func);
	}

	return 0;
}

static const struct seq_operations ptype_seq_ops = {
	.start = ptype_seq_start,
	.next  = ptype_seq_next,
	.stop  = ptype_seq_stop,
	.show  = ptype_seq_show,
};

static int __net_init dev_proc_net_init(struct net *net)
{
	int rc = -ENOMEM;

	if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
			sizeof(struct seq_net_private)))
		goto out;
	if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
			 &softnet_seq_ops))
		goto out_dev;
	if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
			sizeof(struct seq_net_private)))
		goto out_softnet;

	if (wext_proc_init(net))
		goto out_ptype;
	rc = 0;
out:
	return rc;
out_ptype:
	remove_proc_entry("ptype", net->proc_net);
out_softnet:
	remove_proc_entry("softnet_stat", net->proc_net);
out_dev:
	remove_proc_entry("dev", net->proc_net);
	goto out;
}

static void __net_exit dev_proc_net_exit(struct net *net)
{
	wext_proc_exit(net);

	remove_proc_entry("ptype", net->proc_net);
	remove_proc_entry("softnet_stat", net->proc_net);
	remove_proc_entry("dev", net->proc_net);
}

static struct pernet_operations __net_initdata dev_proc_ops = {
	.init = dev_proc_net_init,
	.exit = dev_proc_net_exit,
};

static int dev_mc_seq_show(struct seq_file *seq, void *v)
{
	struct netdev_hw_addr *ha;
	struct net_device *dev = v;

	if (v == SEQ_START_TOKEN)
		return 0;

	netif_addr_lock_bh(dev);
	netdev_for_each_mc_addr(ha, dev) {
		seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
			   dev->ifindex, dev->name,
			   ha->refcount, ha->global_use,
			   (int)dev->addr_len, ha->addr);
	}
	netif_addr_unlock_bh(dev);
	return 0;
}

static const struct seq_operations dev_mc_seq_ops = {
	.start = dev_seq_start,
	.next  = dev_seq_next,
	.stop  = dev_seq_stop,
	.show  = dev_mc_seq_show,
};

static int __net_init dev_mc_net_init(struct net *net)
{
	if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
			sizeof(struct seq_net_private)))
		return -ENOMEM;
	return 0;
}

static void __net_exit dev_mc_net_exit(struct net *net)
{
	remove_proc_entry("dev_mcast", net->proc_net);
}

static struct pernet_operations __net_initdata dev_mc_net_ops = {
	.init = dev_mc_net_init,
	.exit = dev_mc_net_exit,
};

int __init dev_proc_init(void)
{
	int ret = register_pernet_subsys(&dev_proc_ops);
	if (!ret)
		return register_pernet_subsys(&dev_mc_net_ops);
	return ret;
}