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