xref: /openbmc/linux/net/core/net-procfs.c (revision cfbb9be8) 
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 
13 extern struct list_head ptype_all __read_mostly;
14 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
15 
16 static 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 
32 static 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  */
53 static 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 
66 static 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 
72 static void dev_seq_stop(struct seq_file *seq, void *v)
73 	__releases(RCU)
74 {
75 	rcu_read_unlock();
76 }
77 
78 static 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  */
106 static 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 
119 static 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 
132 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
133 {
134 	return softnet_get_online(pos);
135 }
136 
137 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
138 {
139 	++*pos;
140 	return softnet_get_online(pos);
141 }
142 
143 static void softnet_seq_stop(struct seq_file *seq, void *v)
144 {
145 }
146 
147 static 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 
171 static 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 
178 static 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 
184 static 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 
191 static 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 
198 static int softnet_seq_open(struct inode *inode, struct file *file)
199 {
200 	return seq_open(file, &softnet_seq_ops);
201 }
202 
203 static 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 
210 static 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 
232 static 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 
239 static 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 	}
264 found:
265 	return list_entry(nxt, struct packet_type, list);
266 }
267 
268 static void ptype_seq_stop(struct seq_file *seq, void *v)
269 	__releases(RCU)
270 {
271 	rcu_read_unlock();
272 }
273 
274 static 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 
293 static 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 
300 static 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 
306 static 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 
314 static int __net_init dev_proc_net_init(struct net *net)
315 {
316 	int rc = -ENOMEM;
317 
318 	if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
319 		goto out;
320 	if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
321 			 &softnet_seq_fops))
322 		goto out_dev;
323 	if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
324 		goto out_softnet;
325 
326 	if (wext_proc_init(net))
327 		goto out_ptype;
328 	rc = 0;
329 out:
330 	return rc;
331 out_ptype:
332 	remove_proc_entry("ptype", net->proc_net);
333 out_softnet:
334 	remove_proc_entry("softnet_stat", net->proc_net);
335 out_dev:
336 	remove_proc_entry("dev", net->proc_net);
337 	goto out;
338 }
339 
340 static 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 
349 static struct pernet_operations __net_initdata dev_proc_ops = {
350 	.init = dev_proc_net_init,
351 	.exit = dev_proc_net_exit,
352 };
353 
354 static 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 
373 static 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 
380 static 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 
386 static 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 
393 static 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 
400 static void __net_exit dev_mc_net_exit(struct net *net)
401 {
402 	remove_proc_entry("dev_mcast", net->proc_net);
403 }
404 
405 static struct pernet_operations __net_initdata dev_mc_net_ops = {
406 	.init = dev_mc_net_init,
407 	.exit = dev_mc_net_exit,
408 };
409 
410 int __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 }
417