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 const struct seq_operations softnet_seq_ops = {
179	.start = softnet_seq_start,
180	.next  = softnet_seq_next,
181	.stop  = softnet_seq_stop,
182	.show  = softnet_seq_show,
183};
184
185static void *ptype_get_idx(loff_t pos)
186{
187	struct packet_type *pt = NULL;
188	loff_t i = 0;
189	int t;
190
191	list_for_each_entry_rcu(pt, &ptype_all, list) {
192		if (i == pos)
193			return pt;
194		++i;
195	}
196
197	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
198		list_for_each_entry_rcu(pt, &ptype_base[t], list) {
199			if (i == pos)
200				return pt;
201			++i;
202		}
203	}
204	return NULL;
205}
206
207static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
208	__acquires(RCU)
209{
210	rcu_read_lock();
211	return *pos ? ptype_get_idx(*pos - 1) : SEQ_START_TOKEN;
212}
213
214static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
215{
216	struct packet_type *pt;
217	struct list_head *nxt;
218	int hash;
219
220	++*pos;
221	if (v == SEQ_START_TOKEN)
222		return ptype_get_idx(0);
223
224	pt = v;
225	nxt = pt->list.next;
226	if (pt->type == htons(ETH_P_ALL)) {
227		if (nxt != &ptype_all)
228			goto found;
229		hash = 0;
230		nxt = ptype_base[0].next;
231	} else
232		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
233
234	while (nxt == &ptype_base[hash]) {
235		if (++hash >= PTYPE_HASH_SIZE)
236			return NULL;
237		nxt = ptype_base[hash].next;
238	}
239found:
240	return list_entry(nxt, struct packet_type, list);
241}
242
243static void ptype_seq_stop(struct seq_file *seq, void *v)
244	__releases(RCU)
245{
246	rcu_read_unlock();
247}
248
249static int ptype_seq_show(struct seq_file *seq, void *v)
250{
251	struct packet_type *pt = v;
252
253	if (v == SEQ_START_TOKEN)
254		seq_puts(seq, "Type Device      Function\n");
255	else if (pt->dev == NULL || dev_net(pt->dev) == seq_file_net(seq)) {
256		if (pt->type == htons(ETH_P_ALL))
257			seq_puts(seq, "ALL ");
258		else
259			seq_printf(seq, "%04x", ntohs(pt->type));
260
261		seq_printf(seq, " %-8s %ps\n",
262			   pt->dev ? pt->dev->name : "", pt->func);
263	}
264
265	return 0;
266}
267
268static const struct seq_operations ptype_seq_ops = {
269	.start = ptype_seq_start,
270	.next  = ptype_seq_next,
271	.stop  = ptype_seq_stop,
272	.show  = ptype_seq_show,
273};
274
275static int __net_init dev_proc_net_init(struct net *net)
276{
277	int rc = -ENOMEM;
278
279	if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
280			sizeof(struct seq_net_private)))
281		goto out;
282	if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
283			 &softnet_seq_ops))
284		goto out_dev;
285	if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
286			sizeof(struct seq_net_private)))
287		goto out_softnet;
288
289	if (wext_proc_init(net))
290		goto out_ptype;
291	rc = 0;
292out:
293	return rc;
294out_ptype:
295	remove_proc_entry("ptype", net->proc_net);
296out_softnet:
297	remove_proc_entry("softnet_stat", net->proc_net);
298out_dev:
299	remove_proc_entry("dev", net->proc_net);
300	goto out;
301}
302
303static void __net_exit dev_proc_net_exit(struct net *net)
304{
305	wext_proc_exit(net);
306
307	remove_proc_entry("ptype", net->proc_net);
308	remove_proc_entry("softnet_stat", net->proc_net);
309	remove_proc_entry("dev", net->proc_net);
310}
311
312static struct pernet_operations __net_initdata dev_proc_ops = {
313	.init = dev_proc_net_init,
314	.exit = dev_proc_net_exit,
315};
316
317static int dev_mc_seq_show(struct seq_file *seq, void *v)
318{
319	struct netdev_hw_addr *ha;
320	struct net_device *dev = v;
321
322	if (v == SEQ_START_TOKEN)
323		return 0;
324
325	netif_addr_lock_bh(dev);
326	netdev_for_each_mc_addr(ha, dev) {
327		seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
328			   dev->ifindex, dev->name,
329			   ha->refcount, ha->global_use,
330			   (int)dev->addr_len, ha->addr);
331	}
332	netif_addr_unlock_bh(dev);
333	return 0;
334}
335
336static const struct seq_operations dev_mc_seq_ops = {
337	.start = dev_seq_start,
338	.next  = dev_seq_next,
339	.stop  = dev_seq_stop,
340	.show  = dev_mc_seq_show,
341};
342
343static int __net_init dev_mc_net_init(struct net *net)
344{
345	if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
346			sizeof(struct seq_net_private)))
347		return -ENOMEM;
348	return 0;
349}
350
351static void __net_exit dev_mc_net_exit(struct net *net)
352{
353	remove_proc_entry("dev_mcast", net->proc_net);
354}
355
356static struct pernet_operations __net_initdata dev_mc_net_ops = {
357	.init = dev_mc_net_init,
358	.exit = dev_mc_net_exit,
359};
360
361int __init dev_proc_init(void)
362{
363	int ret = register_pernet_subsys(&dev_proc_ops);
364	if (!ret)
365		return register_pernet_subsys(&dev_mc_net_ops);
366	return ret;
367}