xref: /openbmc/linux/net/core/net-procfs.c (revision a2cce7a9) 
1 #include <linux/netdevice.h>
2 #include <linux/proc_fs.h>
3 #include <linux/seq_file.h>
4 #include <net/wext.h>
5 
6 #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1)
7 
8 #define get_bucket(x) ((x) >> BUCKET_SPACE)
9 #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1))
10 #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o))
11 
12 extern struct list_head ptype_all __read_mostly;
13 extern struct list_head ptype_base[PTYPE_HASH_SIZE] __read_mostly;
14 
15 static 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_name_head[get_bucket(*pos)];
23 	hlist_for_each_entry_rcu(dev, h, name_hlist) {
24 		if (++count == offset)
25 			return dev;
26 	}
27 
28 	return NULL;
29 }
30 
31 static 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  */
52 static 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 
65 static 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 
71 static void dev_seq_stop(struct seq_file *seq, void *v)
72 	__releases(RCU)
73 {
74 	rcu_read_unlock();
75 }
76 
77 static 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  */
105 static 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 
118 static struct softnet_data *softnet_get_online(loff_t *pos)
119 {
120 	struct softnet_data *sd = NULL;
121 
122 	while (*pos < nr_cpu_ids)
123 		if (cpu_online(*pos)) {
124 			sd = &per_cpu(softnet_data, *pos);
125 			break;
126 		} else
127 			++*pos;
128 	return sd;
129 }
130 
131 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
132 {
133 	return softnet_get_online(pos);
134 }
135 
136 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
137 {
138 	++*pos;
139 	return softnet_get_online(pos);
140 }
141 
142 static void softnet_seq_stop(struct seq_file *seq, void *v)
143 {
144 }
145 
146 static int softnet_seq_show(struct seq_file *seq, void *v)
147 {
148 	struct softnet_data *sd = v;
149 	unsigned int flow_limit_count = 0;
150 
151 #ifdef CONFIG_NET_FLOW_LIMIT
152 	struct sd_flow_limit *fl;
153 
154 	rcu_read_lock();
155 	fl = rcu_dereference(sd->flow_limit);
156 	if (fl)
157 		flow_limit_count = fl->count;
158 	rcu_read_unlock();
159 #endif
160 
161 	seq_printf(seq,
162 		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x\n",
163 		   sd->processed, sd->dropped, sd->time_squeeze, 0,
164 		   0, 0, 0, 0, /* was fastroute */
165 		   sd->cpu_collision, sd->received_rps, flow_limit_count);
166 	return 0;
167 }
168 
169 static const struct seq_operations dev_seq_ops = {
170 	.start = dev_seq_start,
171 	.next  = dev_seq_next,
172 	.stop  = dev_seq_stop,
173 	.show  = dev_seq_show,
174 };
175 
176 static int dev_seq_open(struct inode *inode, struct file *file)
177 {
178 	return seq_open_net(inode, file, &dev_seq_ops,
179 			    sizeof(struct seq_net_private));
180 }
181 
182 static const struct file_operations dev_seq_fops = {
183 	.owner	 = THIS_MODULE,
184 	.open    = dev_seq_open,
185 	.read    = seq_read,
186 	.llseek  = seq_lseek,
187 	.release = seq_release_net,
188 };
189 
190 static const struct seq_operations softnet_seq_ops = {
191 	.start = softnet_seq_start,
192 	.next  = softnet_seq_next,
193 	.stop  = softnet_seq_stop,
194 	.show  = softnet_seq_show,
195 };
196 
197 static int softnet_seq_open(struct inode *inode, struct file *file)
198 {
199 	return seq_open(file, &softnet_seq_ops);
200 }
201 
202 static const struct file_operations softnet_seq_fops = {
203 	.owner	 = THIS_MODULE,
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 	.owner	 = THIS_MODULE,
308 	.open    = ptype_seq_open,
309 	.read    = seq_read,
310 	.llseek  = seq_lseek,
311 	.release = seq_release_net,
312 };
313 
314 
315 static int __net_init dev_proc_net_init(struct net *net)
316 {
317 	int rc = -ENOMEM;
318 
319 	if (!proc_create("dev", S_IRUGO, net->proc_net, &dev_seq_fops))
320 		goto out;
321 	if (!proc_create("softnet_stat", S_IRUGO, net->proc_net,
322 			 &softnet_seq_fops))
323 		goto out_dev;
324 	if (!proc_create("ptype", S_IRUGO, net->proc_net, &ptype_seq_fops))
325 		goto out_softnet;
326 
327 	if (wext_proc_init(net))
328 		goto out_ptype;
329 	rc = 0;
330 out:
331 	return rc;
332 out_ptype:
333 	remove_proc_entry("ptype", net->proc_net);
334 out_softnet:
335 	remove_proc_entry("softnet_stat", net->proc_net);
336 out_dev:
337 	remove_proc_entry("dev", net->proc_net);
338 	goto out;
339 }
340 
341 static void __net_exit dev_proc_net_exit(struct net *net)
342 {
343 	wext_proc_exit(net);
344 
345 	remove_proc_entry("ptype", net->proc_net);
346 	remove_proc_entry("softnet_stat", net->proc_net);
347 	remove_proc_entry("dev", net->proc_net);
348 }
349 
350 static struct pernet_operations __net_initdata dev_proc_ops = {
351 	.init = dev_proc_net_init,
352 	.exit = dev_proc_net_exit,
353 };
354 
355 static int dev_mc_seq_show(struct seq_file *seq, void *v)
356 {
357 	struct netdev_hw_addr *ha;
358 	struct net_device *dev = v;
359 
360 	if (v == SEQ_START_TOKEN)
361 		return 0;
362 
363 	netif_addr_lock_bh(dev);
364 	netdev_for_each_mc_addr(ha, dev) {
365 		int i;
366 
367 		seq_printf(seq, "%-4d %-15s %-5d %-5d ", dev->ifindex,
368 			   dev->name, ha->refcount, ha->global_use);
369 
370 		for (i = 0; i < dev->addr_len; i++)
371 			seq_printf(seq, "%02x", ha->addr[i]);
372 
373 		seq_putc(seq, '\n');
374 	}
375 	netif_addr_unlock_bh(dev);
376 	return 0;
377 }
378 
379 static const struct seq_operations dev_mc_seq_ops = {
380 	.start = dev_seq_start,
381 	.next  = dev_seq_next,
382 	.stop  = dev_seq_stop,
383 	.show  = dev_mc_seq_show,
384 };
385 
386 static int dev_mc_seq_open(struct inode *inode, struct file *file)
387 {
388 	return seq_open_net(inode, file, &dev_mc_seq_ops,
389 			    sizeof(struct seq_net_private));
390 }
391 
392 static const struct file_operations dev_mc_seq_fops = {
393 	.owner	 = THIS_MODULE,
394 	.open    = dev_mc_seq_open,
395 	.read    = seq_read,
396 	.llseek  = seq_lseek,
397 	.release = seq_release_net,
398 };
399 
400 static int __net_init dev_mc_net_init(struct net *net)
401 {
402 	if (!proc_create("dev_mcast", 0, net->proc_net, &dev_mc_seq_fops))
403 		return -ENOMEM;
404 	return 0;
405 }
406 
407 static void __net_exit dev_mc_net_exit(struct net *net)
408 {
409 	remove_proc_entry("dev_mcast", net->proc_net);
410 }
411 
412 static struct pernet_operations __net_initdata dev_mc_net_ops = {
413 	.init = dev_mc_net_init,
414 	.exit = dev_mc_net_exit,
415 };
416 
417 int __init dev_proc_init(void)
418 {
419 	int ret = register_pernet_subsys(&dev_proc_ops);
420 	if (!ret)
421 		return register_pernet_subsys(&dev_mc_net_ops);
422 	return ret;
423 }
424