xref: /linux/net/core/net-procfs.c (revision ab93e0dd72c37d378dd936f031ffb83ff2bd87ce)
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 #include <net/hotdata.h>
7 
8 #include "dev.h"
9 
10 static void *dev_seq_from_index(struct seq_file *seq, loff_t *pos)
11 {
12 	unsigned long ifindex = *pos;
13 	struct net_device *dev;
14 
15 	for_each_netdev_dump(seq_file_net(seq), dev, ifindex) {
16 		*pos = dev->ifindex;
17 		return dev;
18 	}
19 	return NULL;
20 }
21 
22 static void *dev_seq_start(struct seq_file *seq, loff_t *pos)
23 	__acquires(RCU)
24 {
25 	rcu_read_lock();
26 	if (!*pos)
27 		return SEQ_START_TOKEN;
28 
29 	return dev_seq_from_index(seq, pos);
30 }
31 
32 static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos)
33 {
34 	++*pos;
35 	return dev_seq_from_index(seq, pos);
36 }
37 
38 static void dev_seq_stop(struct seq_file *seq, void *v)
39 	__releases(RCU)
40 {
41 	rcu_read_unlock();
42 }
43 
44 static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev)
45 {
46 	struct rtnl_link_stats64 temp;
47 	const struct rtnl_link_stats64 *stats = dev_get_stats(dev, &temp);
48 
49 	seq_printf(seq, "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu "
50 		   "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n",
51 		   dev->name, stats->rx_bytes, stats->rx_packets,
52 		   stats->rx_errors,
53 		   stats->rx_dropped + stats->rx_missed_errors,
54 		   stats->rx_fifo_errors,
55 		   stats->rx_length_errors + stats->rx_over_errors +
56 		    stats->rx_crc_errors + stats->rx_frame_errors,
57 		   stats->rx_compressed, stats->multicast,
58 		   stats->tx_bytes, stats->tx_packets,
59 		   stats->tx_errors, stats->tx_dropped,
60 		   stats->tx_fifo_errors, stats->collisions,
61 		   stats->tx_carrier_errors +
62 		    stats->tx_aborted_errors +
63 		    stats->tx_window_errors +
64 		    stats->tx_heartbeat_errors,
65 		   stats->tx_compressed);
66 }
67 
68 /*
69  *	Called from the PROCfs module. This now uses the new arbitrary sized
70  *	/proc/net interface to create /proc/net/dev
71  */
72 static int dev_seq_show(struct seq_file *seq, void *v)
73 {
74 	if (v == SEQ_START_TOKEN)
75 		seq_puts(seq, "Inter-|   Receive                            "
76 			      "                    |  Transmit\n"
77 			      " face |bytes    packets errs drop fifo frame "
78 			      "compressed multicast|bytes    packets errs "
79 			      "drop fifo colls carrier compressed\n");
80 	else
81 		dev_seq_printf_stats(seq, v);
82 	return 0;
83 }
84 
85 static u32 softnet_input_pkt_queue_len(struct softnet_data *sd)
86 {
87 	return skb_queue_len_lockless(&sd->input_pkt_queue);
88 }
89 
90 static u32 softnet_process_queue_len(struct softnet_data *sd)
91 {
92 	return skb_queue_len_lockless(&sd->process_queue);
93 }
94 
95 static struct softnet_data *softnet_get_online(loff_t *pos)
96 {
97 	struct softnet_data *sd = NULL;
98 
99 	while (*pos < nr_cpu_ids)
100 		if (cpu_online(*pos)) {
101 			sd = &per_cpu(softnet_data, *pos);
102 			break;
103 		} else
104 			++*pos;
105 	return sd;
106 }
107 
108 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
109 {
110 	return softnet_get_online(pos);
111 }
112 
113 static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
114 {
115 	++*pos;
116 	return softnet_get_online(pos);
117 }
118 
119 static void softnet_seq_stop(struct seq_file *seq, void *v)
120 {
121 }
122 
123 static int softnet_seq_show(struct seq_file *seq, void *v)
124 {
125 	struct softnet_data *sd = v;
126 	u32 input_qlen = softnet_input_pkt_queue_len(sd);
127 	u32 process_qlen = softnet_process_queue_len(sd);
128 	unsigned int flow_limit_count = 0;
129 
130 #ifdef CONFIG_NET_FLOW_LIMIT
131 	struct sd_flow_limit *fl;
132 
133 	rcu_read_lock();
134 	fl = rcu_dereference(sd->flow_limit);
135 	/* Pairs with WRITE_ONCE() in skb_flow_limit() */
136 	if (fl)
137 		flow_limit_count = READ_ONCE(fl->count);
138 	rcu_read_unlock();
139 #endif
140 
141 	/* the index is the CPU id owing this sd. Since offline CPUs are not
142 	 * displayed, it would be othrwise not trivial for the user-space
143 	 * mapping the data a specific CPU
144 	 */
145 	seq_printf(seq,
146 		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
147 		   "%08x %08x\n",
148 		   READ_ONCE(sd->processed), atomic_read(&sd->dropped),
149 		   READ_ONCE(sd->time_squeeze), 0,
150 		   0, 0, 0, 0, /* was fastroute */
151 		   0,	/* was cpu_collision */
152 		   READ_ONCE(sd->received_rps), flow_limit_count,
153 		   input_qlen + process_qlen, (int)seq->index,
154 		   input_qlen, process_qlen);
155 	return 0;
156 }
157 
158 static const struct seq_operations dev_seq_ops = {
159 	.start = dev_seq_start,
160 	.next  = dev_seq_next,
161 	.stop  = dev_seq_stop,
162 	.show  = dev_seq_show,
163 };
164 
165 static const struct seq_operations softnet_seq_ops = {
166 	.start = softnet_seq_start,
167 	.next  = softnet_seq_next,
168 	.stop  = softnet_seq_stop,
169 	.show  = softnet_seq_show,
170 };
171 
172 static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
173 {
174 	struct list_head *ptype_list = NULL;
175 	struct packet_type *pt = NULL;
176 	struct net_device *dev;
177 	loff_t i = 0;
178 	int t;
179 
180 	for_each_netdev_rcu(seq_file_net(seq), dev) {
181 		ptype_list = &dev->ptype_all;
182 		list_for_each_entry_rcu(pt, ptype_list, list) {
183 			if (i == pos)
184 				return pt;
185 			++i;
186 		}
187 	}
188 
189 	list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_all, list) {
190 		if (i == pos)
191 			return pt;
192 		++i;
193 	}
194 
195 	list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_specific, list) {
196 		if (i == pos)
197 			return pt;
198 		++i;
199 	}
200 
201 	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
202 		list_for_each_entry_rcu(pt, &ptype_base[t], list) {
203 			if (i == pos)
204 				return pt;
205 			++i;
206 		}
207 	}
208 	return NULL;
209 }
210 
211 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
212 	__acquires(RCU)
213 {
214 	rcu_read_lock();
215 	return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
216 }
217 
218 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
219 {
220 	struct net *net = seq_file_net(seq);
221 	struct net_device *dev;
222 	struct packet_type *pt;
223 	struct list_head *nxt;
224 	int hash;
225 
226 	++*pos;
227 	if (v == SEQ_START_TOKEN)
228 		return ptype_get_idx(seq, 0);
229 
230 	pt = v;
231 	nxt = pt->list.next;
232 	if (pt->dev) {
233 		if (nxt != &pt->dev->ptype_all)
234 			goto found;
235 
236 		dev = pt->dev;
237 		for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
238 			if (!list_empty(&dev->ptype_all)) {
239 				nxt = dev->ptype_all.next;
240 				goto found;
241 			}
242 		}
243 		nxt = net->ptype_all.next;
244 		goto net_ptype_all;
245 	}
246 
247 	if (pt->af_packet_net) {
248 net_ptype_all:
249 		if (nxt != &net->ptype_all && nxt != &net->ptype_specific)
250 			goto found;
251 
252 		if (nxt == &net->ptype_all) {
253 			/* continue with ->ptype_specific if it's not empty */
254 			nxt = net->ptype_specific.next;
255 			if (nxt != &net->ptype_specific)
256 				goto found;
257 		}
258 
259 		hash = 0;
260 		nxt = ptype_base[0].next;
261 	} else
262 		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
263 
264 	while (nxt == &ptype_base[hash]) {
265 		if (++hash >= PTYPE_HASH_SIZE)
266 			return NULL;
267 		nxt = ptype_base[hash].next;
268 	}
269 found:
270 	return list_entry(nxt, struct packet_type, list);
271 }
272 
273 static void ptype_seq_stop(struct seq_file *seq, void *v)
274 	__releases(RCU)
275 {
276 	rcu_read_unlock();
277 }
278 
279 static int ptype_seq_show(struct seq_file *seq, void *v)
280 {
281 	struct packet_type *pt = v;
282 
283 	if (v == SEQ_START_TOKEN)
284 		seq_puts(seq, "Type Device      Function\n");
285 	else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
286 		 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
287 		if (pt->type == htons(ETH_P_ALL))
288 			seq_puts(seq, "ALL ");
289 		else
290 			seq_printf(seq, "%04x", ntohs(pt->type));
291 
292 		seq_printf(seq, " %-8s %ps\n",
293 			   pt->dev ? pt->dev->name : "", pt->func);
294 	}
295 
296 	return 0;
297 }
298 
299 static const struct seq_operations ptype_seq_ops = {
300 	.start = ptype_seq_start,
301 	.next  = ptype_seq_next,
302 	.stop  = ptype_seq_stop,
303 	.show  = ptype_seq_show,
304 };
305 
306 static int __net_init dev_proc_net_init(struct net *net)
307 {
308 	int rc = -ENOMEM;
309 
310 	if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
311 			sizeof(struct seq_net_private)))
312 		goto out;
313 	if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
314 			 &softnet_seq_ops))
315 		goto out_dev;
316 	if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
317 			sizeof(struct seq_net_private)))
318 		goto out_softnet;
319 
320 	if (wext_proc_init(net))
321 		goto out_ptype;
322 	rc = 0;
323 out:
324 	return rc;
325 out_ptype:
326 	remove_proc_entry("ptype", net->proc_net);
327 out_softnet:
328 	remove_proc_entry("softnet_stat", net->proc_net);
329 out_dev:
330 	remove_proc_entry("dev", net->proc_net);
331 	goto out;
332 }
333 
334 static void __net_exit dev_proc_net_exit(struct net *net)
335 {
336 	wext_proc_exit(net);
337 
338 	remove_proc_entry("ptype", net->proc_net);
339 	remove_proc_entry("softnet_stat", net->proc_net);
340 	remove_proc_entry("dev", net->proc_net);
341 }
342 
343 static struct pernet_operations __net_initdata dev_proc_ops = {
344 	.init = dev_proc_net_init,
345 	.exit = dev_proc_net_exit,
346 };
347 
348 static int dev_mc_seq_show(struct seq_file *seq, void *v)
349 {
350 	struct netdev_hw_addr *ha;
351 	struct net_device *dev = v;
352 
353 	if (v == SEQ_START_TOKEN)
354 		return 0;
355 
356 	netif_addr_lock_bh(dev);
357 	netdev_for_each_mc_addr(ha, dev) {
358 		seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
359 			   dev->ifindex, dev->name,
360 			   ha->refcount, ha->global_use,
361 			   (int)dev->addr_len, ha->addr);
362 	}
363 	netif_addr_unlock_bh(dev);
364 	return 0;
365 }
366 
367 static const struct seq_operations dev_mc_seq_ops = {
368 	.start = dev_seq_start,
369 	.next  = dev_seq_next,
370 	.stop  = dev_seq_stop,
371 	.show  = dev_mc_seq_show,
372 };
373 
374 static int __net_init dev_mc_net_init(struct net *net)
375 {
376 	if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
377 			sizeof(struct seq_net_private)))
378 		return -ENOMEM;
379 	return 0;
380 }
381 
382 static void __net_exit dev_mc_net_exit(struct net *net)
383 {
384 	remove_proc_entry("dev_mcast", net->proc_net);
385 }
386 
387 static struct pernet_operations __net_initdata dev_mc_net_ops = {
388 	.init = dev_mc_net_init,
389 	.exit = dev_mc_net_exit,
390 };
391 
392 int __init dev_proc_init(void)
393 {
394 	int ret = register_pernet_subsys(&dev_proc_ops);
395 	if (!ret)
396 		return register_pernet_subsys(&dev_mc_net_ops);
397 	return ret;
398 }
399