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