xref: /linux/net/core/net-procfs.c (revision 1a9239bb4253f9076b5b4b2a1a4e8d7defd77a95)
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 
dev_seq_from_index(struct seq_file * seq,loff_t * pos)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 
dev_seq_start(struct seq_file * seq,loff_t * pos)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 
dev_seq_next(struct seq_file * seq,void * v,loff_t * pos)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 
dev_seq_stop(struct seq_file * seq,void * v)38 static void dev_seq_stop(struct seq_file *seq, void *v)
39 	__releases(RCU)
40 {
41 	rcu_read_unlock();
42 }
43 
dev_seq_printf_stats(struct seq_file * seq,struct net_device * dev)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  */
dev_seq_show(struct seq_file * seq,void * v)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 
softnet_input_pkt_queue_len(struct softnet_data * sd)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 
softnet_process_queue_len(struct softnet_data * sd)90 static u32 softnet_process_queue_len(struct softnet_data *sd)
91 {
92 	return skb_queue_len_lockless(&sd->process_queue);
93 }
94 
softnet_get_online(loff_t * pos)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 
softnet_seq_start(struct seq_file * seq,loff_t * pos)108 static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
109 {
110 	return softnet_get_online(pos);
111 }
112 
softnet_seq_next(struct seq_file * seq,void * v,loff_t * pos)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 
softnet_seq_stop(struct seq_file * seq,void * v)119 static void softnet_seq_stop(struct seq_file *seq, void *v)
120 {
121 }
122 
softnet_seq_show(struct seq_file * seq,void * v)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 	if (fl)
136 		flow_limit_count = fl->count;
137 	rcu_read_unlock();
138 #endif
139 
140 	/* the index is the CPU id owing this sd. Since offline CPUs are not
141 	 * displayed, it would be othrwise not trivial for the user-space
142 	 * mapping the data a specific CPU
143 	 */
144 	seq_printf(seq,
145 		   "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
146 		   "%08x %08x\n",
147 		   sd->processed, atomic_read(&sd->dropped),
148 		   sd->time_squeeze, 0,
149 		   0, 0, 0, 0, /* was fastroute */
150 		   0,	/* was cpu_collision */
151 		   sd->received_rps, flow_limit_count,
152 		   input_qlen + process_qlen, (int)seq->index,
153 		   input_qlen, process_qlen);
154 	return 0;
155 }
156 
157 static const struct seq_operations dev_seq_ops = {
158 	.start = dev_seq_start,
159 	.next  = dev_seq_next,
160 	.stop  = dev_seq_stop,
161 	.show  = dev_seq_show,
162 };
163 
164 static const struct seq_operations softnet_seq_ops = {
165 	.start = softnet_seq_start,
166 	.next  = softnet_seq_next,
167 	.stop  = softnet_seq_stop,
168 	.show  = softnet_seq_show,
169 };
170 
ptype_get_idx(struct seq_file * seq,loff_t pos)171 static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
172 {
173 	struct list_head *ptype_list = NULL;
174 	struct packet_type *pt = NULL;
175 	struct net_device *dev;
176 	loff_t i = 0;
177 	int t;
178 
179 	for_each_netdev_rcu(seq_file_net(seq), dev) {
180 		ptype_list = &dev->ptype_all;
181 		list_for_each_entry_rcu(pt, ptype_list, list) {
182 			if (i == pos)
183 				return pt;
184 			++i;
185 		}
186 	}
187 
188 	list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_all, list) {
189 		if (i == pos)
190 			return pt;
191 		++i;
192 	}
193 
194 	list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_specific, list) {
195 		if (i == pos)
196 			return pt;
197 		++i;
198 	}
199 
200 	for (t = 0; t < PTYPE_HASH_SIZE; t++) {
201 		list_for_each_entry_rcu(pt, &ptype_base[t], list) {
202 			if (i == pos)
203 				return pt;
204 			++i;
205 		}
206 	}
207 	return NULL;
208 }
209 
ptype_seq_start(struct seq_file * seq,loff_t * pos)210 static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
211 	__acquires(RCU)
212 {
213 	rcu_read_lock();
214 	return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
215 }
216 
ptype_seq_next(struct seq_file * seq,void * v,loff_t * pos)217 static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
218 {
219 	struct net *net = seq_file_net(seq);
220 	struct net_device *dev;
221 	struct packet_type *pt;
222 	struct list_head *nxt;
223 	int hash;
224 
225 	++*pos;
226 	if (v == SEQ_START_TOKEN)
227 		return ptype_get_idx(seq, 0);
228 
229 	pt = v;
230 	nxt = pt->list.next;
231 	if (pt->dev) {
232 		if (nxt != &pt->dev->ptype_all)
233 			goto found;
234 
235 		dev = pt->dev;
236 		for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
237 			if (!list_empty(&dev->ptype_all)) {
238 				nxt = dev->ptype_all.next;
239 				goto found;
240 			}
241 		}
242 		nxt = net->ptype_all.next;
243 		goto net_ptype_all;
244 	}
245 
246 	if (pt->af_packet_net) {
247 net_ptype_all:
248 		if (nxt != &net->ptype_all && nxt != &net->ptype_specific)
249 			goto found;
250 
251 		if (nxt == &net->ptype_all) {
252 			/* continue with ->ptype_specific if it's not empty */
253 			nxt = net->ptype_specific.next;
254 			if (nxt != &net->ptype_specific)
255 				goto found;
256 		}
257 
258 		hash = 0;
259 		nxt = ptype_base[0].next;
260 	} else
261 		hash = ntohs(pt->type) & PTYPE_HASH_MASK;
262 
263 	while (nxt == &ptype_base[hash]) {
264 		if (++hash >= PTYPE_HASH_SIZE)
265 			return NULL;
266 		nxt = ptype_base[hash].next;
267 	}
268 found:
269 	return list_entry(nxt, struct packet_type, list);
270 }
271 
ptype_seq_stop(struct seq_file * seq,void * v)272 static void ptype_seq_stop(struct seq_file *seq, void *v)
273 	__releases(RCU)
274 {
275 	rcu_read_unlock();
276 }
277 
ptype_seq_show(struct seq_file * seq,void * v)278 static int ptype_seq_show(struct seq_file *seq, void *v)
279 {
280 	struct packet_type *pt = v;
281 
282 	if (v == SEQ_START_TOKEN)
283 		seq_puts(seq, "Type Device      Function\n");
284 	else if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
285 		 (!pt->dev || net_eq(dev_net(pt->dev), seq_file_net(seq)))) {
286 		if (pt->type == htons(ETH_P_ALL))
287 			seq_puts(seq, "ALL ");
288 		else
289 			seq_printf(seq, "%04x", ntohs(pt->type));
290 
291 		seq_printf(seq, " %-8s %ps\n",
292 			   pt->dev ? pt->dev->name : "", pt->func);
293 	}
294 
295 	return 0;
296 }
297 
298 static const struct seq_operations ptype_seq_ops = {
299 	.start = ptype_seq_start,
300 	.next  = ptype_seq_next,
301 	.stop  = ptype_seq_stop,
302 	.show  = ptype_seq_show,
303 };
304 
dev_proc_net_init(struct net * net)305 static int __net_init dev_proc_net_init(struct net *net)
306 {
307 	int rc = -ENOMEM;
308 
309 	if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
310 			sizeof(struct seq_net_private)))
311 		goto out;
312 	if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
313 			 &softnet_seq_ops))
314 		goto out_dev;
315 	if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
316 			sizeof(struct seq_net_private)))
317 		goto out_softnet;
318 
319 	if (wext_proc_init(net))
320 		goto out_ptype;
321 	rc = 0;
322 out:
323 	return rc;
324 out_ptype:
325 	remove_proc_entry("ptype", net->proc_net);
326 out_softnet:
327 	remove_proc_entry("softnet_stat", net->proc_net);
328 out_dev:
329 	remove_proc_entry("dev", net->proc_net);
330 	goto out;
331 }
332 
dev_proc_net_exit(struct net * net)333 static void __net_exit dev_proc_net_exit(struct net *net)
334 {
335 	wext_proc_exit(net);
336 
337 	remove_proc_entry("ptype", net->proc_net);
338 	remove_proc_entry("softnet_stat", net->proc_net);
339 	remove_proc_entry("dev", net->proc_net);
340 }
341 
342 static struct pernet_operations __net_initdata dev_proc_ops = {
343 	.init = dev_proc_net_init,
344 	.exit = dev_proc_net_exit,
345 };
346 
dev_mc_seq_show(struct seq_file * seq,void * v)347 static int dev_mc_seq_show(struct seq_file *seq, void *v)
348 {
349 	struct netdev_hw_addr *ha;
350 	struct net_device *dev = v;
351 
352 	if (v == SEQ_START_TOKEN)
353 		return 0;
354 
355 	netif_addr_lock_bh(dev);
356 	netdev_for_each_mc_addr(ha, dev) {
357 		seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
358 			   dev->ifindex, dev->name,
359 			   ha->refcount, ha->global_use,
360 			   (int)dev->addr_len, ha->addr);
361 	}
362 	netif_addr_unlock_bh(dev);
363 	return 0;
364 }
365 
366 static const struct seq_operations dev_mc_seq_ops = {
367 	.start = dev_seq_start,
368 	.next  = dev_seq_next,
369 	.stop  = dev_seq_stop,
370 	.show  = dev_mc_seq_show,
371 };
372 
dev_mc_net_init(struct net * net)373 static int __net_init dev_mc_net_init(struct net *net)
374 {
375 	if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
376 			sizeof(struct seq_net_private)))
377 		return -ENOMEM;
378 	return 0;
379 }
380 
dev_mc_net_exit(struct net * net)381 static void __net_exit dev_mc_net_exit(struct net *net)
382 {
383 	remove_proc_entry("dev_mcast", net->proc_net);
384 }
385 
386 static struct pernet_operations __net_initdata dev_mc_net_ops = {
387 	.init = dev_mc_net_init,
388 	.exit = dev_mc_net_exit,
389 };
390 
dev_proc_init(void)391 int __init dev_proc_init(void)
392 {
393 	int ret = register_pernet_subsys(&dev_proc_ops);
394 	if (!ret)
395 		return register_pernet_subsys(&dev_mc_net_ops);
396 	return ret;
397 }
398