net-procfs.c

  1// SPDX-License-Identifier: GPL-2.0
  2#include <linux/netdevice.h>
  3#include <linux/proc_fs.h>
  4#include <linux/seq_file.h>
  5#include <net/wext.h>
  6#include <net/hotdata.h>
  7
  8#include "dev.h"
  9
 10static void *dev_seq_from_index(struct seq_file *seq, loff_t *pos)
 11{
 12	unsigned long ifindex = *pos;
 13	struct net_device *dev;
 14
 15	for_each_netdev_dump(seq_file_net(seq), dev, ifindex) {
 16		*pos = dev->ifindex;
 17		return dev;
 18	}
 19	return NULL;
 20}
 21
 22static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
 23	__acquires(RCU)
 24{
 25	rcu_read_lock();
 26	if (!*pos)
 27		return SEQ_START_TOKEN;
 28
 29	return dev_seq_from_index(seq, pos);
 30}
 31
 32static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
 33{
 34	++*pos;
 35	return dev_seq_from_index(seq, pos);
 36}
 37
 38static void dev_seq_stop(struct seq_file *seq, void *v)
 39	__releases(RCU)
 40{
 41	rcu_read_unlock();
 42}
 43
 44static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
 45{
 46	struct rtnl_link_stats64 temp;
 47	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
 48
 49	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
 50		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
 51		   dev->name, stats->rx_bytes, stats->rx_packets,
 52		   stats->rx_errors,
 53		   stats->rx_dropped + stats->rx_missed_errors,
 54		   stats->rx_fifo_errors,
 55		   stats->rx_length_errors + stats->rx_over_errors +
 56		    stats->rx_crc_errors + stats->rx_frame_errors,
 57		   stats->rx_compressed, stats->multicast,
 58		   stats->tx_bytes, stats->tx_packets,
 59		   stats->tx_errors, stats->tx_dropped,
 60		   stats->tx_fifo_errors, stats->collisions,
 61		   stats->tx_carrier_errors +
 62		    stats->tx_aborted_errors +
 63		    stats->tx_window_errors +
 64		    stats->tx_heartbeat_errors,
 65		   stats->tx_compressed);
 66}
 67
 68/*
 69 *	Called from the PROCfs module. This now uses the new arbitrary sized
 70 *	/proc/net interface to create /proc/net/dev
 71 */
 72static int dev_seq_show(struct seq_file *seq, void *v)
 73{
 74	if (v == SEQ_START_TOKEN)
 75		seq_puts(seq, "Inter-|   Receive                            "
 76			      "                    |  Transmit\n"
 77			      " face |bytes    packets errs drop fifo frame "
 78			      "compressed multicast|bytes    packets errs "
 79			      "drop fifo colls carrier compressed\n");
 80	else
 81		dev_seq_printf_stats(seq, v);
 82	return 0;
 83}
 84
 85static u32 softnet_input_pkt_queue_len(struct softnet_data *sd)
 86{
 87	return skb_queue_len_lockless(&sd->input_pkt_queue);
 88}
 89
 90static u32 softnet_process_queue_len(struct softnet_data *sd)
 91{
 92	return skb_queue_len_lockless(&sd->process_queue);
 93}
 94
 95static struct softnet_data *softnet_get_online(loff_t *pos)
 96{
 97	struct softnet_data *sd = NULL;
 98
 99	while (*pos < nr_cpu_ids)
100		if (cpu_online(*pos)) {
101			sd = &per_cpu(softnet_data, *pos);
102			break;
103		} else
104			++*pos;
105	return sd;
106}
107
108static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
109{
110	return softnet_get_online(pos);
111}
112
113static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
114{
115	++*pos;
116	return softnet_get_online(pos);
117}
118
119static void softnet_seq_stop(struct seq_file *seq, void *v)
120{
121}
122
123static int softnet_seq_show(struct seq_file *seq, void *v)
124{
125	struct softnet_data *sd = v;
126	u32 input_qlen = softnet_input_pkt_queue_len(sd);
127	u32 process_qlen = softnet_process_queue_len(sd);
128	unsigned int flow_limit_count = 0;
129
130#ifdef CONFIG_NET_FLOW_LIMIT
131	struct sd_flow_limit *fl;
132
133	rcu_read_lock();
134	fl = rcu_dereference(sd->flow_limit);
135	/* Pairs with WRITE_ONCE() in skb_flow_limit() */
136	if (fl)
137		flow_limit_count = READ_ONCE(fl->count);
138	rcu_read_unlock();
139#endif
140
141	/* the index is the CPU id owing this sd. Since offline CPUs are not
142	 * displayed, it would be othrwise not trivial for the user-space
143	 * mapping the data a specific CPU
144	 */
145	seq_printf(seq,
146		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
147		   "%08x %08x\n",
148		   READ_ONCE(sd->processed),
149		   numa_drop_read(&sd->drop_counters),
150		   READ_ONCE(sd->time_squeeze), 0,
151		   0, 0, 0, 0, /* was fastroute */
152		   0,	/* was cpu_collision */
153		   READ_ONCE(sd->received_rps), flow_limit_count,
154		   input_qlen + process_qlen, (int)seq->index,
155		   input_qlen, process_qlen);
156	return 0;
157}
158
159static const struct seq_operations dev_seq_ops = {
160	.start = dev_seq_start,
161	.next  = dev_seq_next,
162	.stop  = dev_seq_stop,
163	.show  = dev_seq_show,
164};
165
166static const struct seq_operations softnet_seq_ops = {
167	.start = softnet_seq_start,
168	.next  = softnet_seq_next,
169	.stop  = softnet_seq_stop,
170	.show  = softnet_seq_show,
171};
172
173struct ptype_iter_state {
174	struct seq_net_private	p;
175	struct net_device	*dev;
176};
177
178static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
179{
180	struct ptype_iter_state *iter = seq->private;
181	struct list_head *ptype_list = NULL;
182	struct packet_type *pt = NULL;
183	struct net_device *dev;
184	loff_t i = 0;
185	int t;
186
187	for_each_netdev_rcu(seq_file_net(seq), dev) {
188		ptype_list = &dev->ptype_all;
189		list_for_each_entry_rcu(pt, ptype_list, list) {
190			if (i == pos) {
191				iter->dev = dev;
192				return pt;
193			}
194			++i;
195		}
196	}
197
198	iter->dev = NULL;
199
200	list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_all, list) {
201		if (i == pos)
202			return pt;
203		++i;
204	}
205
206	list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_specific, list) {
207		if (i == pos)
208			return pt;
209		++i;
210	}
211
212	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
213		list_for_each_entry_rcu(pt, &ptype_base[t], list) {
214			if (i == pos)
215				return pt;
216			++i;
217		}
218	}
219	return NULL;
220}
221
222static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
223	__acquires(RCU)
224{
225	rcu_read_lock();
226	return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
227}
228
229static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
230{
231	struct ptype_iter_state *iter = seq->private;
232	struct net *net = seq_file_net(seq);
233	struct net_device *dev;
234	struct packet_type *pt;
235	struct list_head *nxt;
236	int hash;
237
238	++*pos;
239	if (v == SEQ_START_TOKEN)
240		return ptype_get_idx(seq, 0);
241
242	pt = v;
243	nxt = READ_ONCE(pt->list.next);
244	dev = iter->dev;
245	if (dev) {
246		if (nxt != &dev->ptype_all)
247			goto found;
248
249		for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
250			nxt = READ_ONCE(dev->ptype_all.next);
251			if (nxt != &dev->ptype_all) {
252				iter->dev = dev;
253				goto found;
254			}
255		}
256		iter->dev = NULL;
257		nxt = READ_ONCE(net->ptype_all.next);
258		goto net_ptype_all;
259	}
260
261	if (pt->af_packet_net) {
262net_ptype_all:
263		if (nxt != &net->ptype_all && nxt != &net->ptype_specific)
264			goto found;
265
266		if (nxt == &net->ptype_all) {
267			/* continue with ->ptype_specific if it's not empty */
268			nxt = READ_ONCE(net->ptype_specific.next);
269			if (nxt != &net->ptype_specific)
270				goto found;
271		}
272
273		hash = 0;
274		nxt = READ_ONCE(ptype_base[0].next);
275	} else
276		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
277
278	while (nxt == &ptype_base[hash]) {
279		if (++hash >= PTYPE_HASH_SIZE)
280			return NULL;
281		nxt = READ_ONCE(ptype_base[hash].next);
282	}
283found:
284	return list_entry(nxt, struct packet_type, list);
285}
286
287static void ptype_seq_stop(struct seq_file *seq, void *v)
288	__releases(RCU)
289{
290	rcu_read_unlock();
291}
292
293static int ptype_seq_show(struct seq_file *seq, void *v)
294{
295	struct ptype_iter_state *iter = seq->private;
296	struct packet_type *pt = v;
297	struct net_device *dev;
298
299	if (v == SEQ_START_TOKEN) {
300		seq_puts(seq, "Type Device      Function\n");
301		return 0;
302	}
303	dev = iter->dev;
304	if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
305		 (!dev || net_eq(dev_net(dev), seq_file_net(seq)))) {
306		if (pt->type == htons(ETH_P_ALL))
307			seq_puts(seq, "ALL ");
308		else
309			seq_printf(seq, "%04x", ntohs(pt->type));
310
311		seq_printf(seq, " %-8s %ps\n",
312			   dev ? dev->name : "", pt->func);
313	}
314
315	return 0;
316}
317
318static const struct seq_operations ptype_seq_ops = {
319	.start = ptype_seq_start,
320	.next  = ptype_seq_next,
321	.stop  = ptype_seq_stop,
322	.show  = ptype_seq_show,
323};
324
325static int __net_init dev_proc_net_init(struct net *net)
326{
327	int rc = -ENOMEM;
328
329	if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
330			sizeof(struct seq_net_private)))
331		goto out;
332	if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
333			 &softnet_seq_ops))
334		goto out_dev;
335	if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
336			sizeof(struct ptype_iter_state)))
337		goto out_softnet;
338
339	if (wext_proc_init(net))
340		goto out_ptype;
341	rc = 0;
342out:
343	return rc;
344out_ptype:
345	remove_proc_entry("ptype", net->proc_net);
346out_softnet:
347	remove_proc_entry("softnet_stat", net->proc_net);
348out_dev:
349	remove_proc_entry("dev", net->proc_net);
350	goto out;
351}
352
353static void __net_exit dev_proc_net_exit(struct net *net)
354{
355	wext_proc_exit(net);
356
357	remove_proc_entry("ptype", net->proc_net);
358	remove_proc_entry("softnet_stat", net->proc_net);
359	remove_proc_entry("dev", net->proc_net);
360}
361
362static struct pernet_operations __net_initdata dev_proc_ops = {
363	.init = dev_proc_net_init,
364	.exit = dev_proc_net_exit,
365};
366
367static int dev_mc_seq_show(struct seq_file *seq, void *v)
368{
369	struct netdev_hw_addr *ha;
370	struct net_device *dev = v;
371
372	if (v == SEQ_START_TOKEN)
373		return 0;
374
375	netif_addr_lock_bh(dev);
376	netdev_for_each_mc_addr(ha, dev) {
377		seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
378			   dev->ifindex, dev->name,
379			   ha->refcount, ha->global_use,
380			   (int)dev->addr_len, ha->addr);
381	}
382	netif_addr_unlock_bh(dev);
383	return 0;
384}
385
386static const struct seq_operations dev_mc_seq_ops = {
387	.start = dev_seq_start,
388	.next  = dev_seq_next,
389	.stop  = dev_seq_stop,
390	.show  = dev_mc_seq_show,
391};
392
393static int __net_init dev_mc_net_init(struct net *net)
394{
395	if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
396			sizeof(struct seq_net_private)))
397		return -ENOMEM;
398	return 0;
399}
400
401static void __net_exit dev_mc_net_exit(struct net *net)
402{
403	remove_proc_entry("dev_mcast", net->proc_net);
404}
405
406static struct pernet_operations __net_initdata dev_mc_net_ops = {
407	.init = dev_mc_net_init,
408	.exit = dev_mc_net_exit,
409};
410
411int __init dev_proc_init(void)
412{
413	int ret = register_pernet_subsys(&dev_proc_ops);
414	if (!ret)
415		return register_pernet_subsys(&dev_mc_net_ops);
416	return ret;
417}