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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
10static 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
22static 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
32static 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
38static void dev_seq_stop(struct seq_file *seq, void *v)
39 __releases(RCU)
40{
41 rcu_read_unlock();
42}
43
44static 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 */
72static 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
85static u32 softnet_input_pkt_queue_len(struct softnet_data *sd)
86{
87 return skb_queue_len_lockless(&sd->input_pkt_queue);
88}
89
90static u32 softnet_process_queue_len(struct softnet_data *sd)
91{
92 return skb_queue_len_lockless(&sd->process_queue);
93}
94
95static 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
108static void *softnet_seq_start(struct seq_file *seq, loff_t *pos)
109{
110 return softnet_get_online(pos);
111}
112
113static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos)
114{
115 ++*pos;
116 return softnet_get_online(pos);
117}
118
119static void softnet_seq_stop(struct seq_file *seq, void *v)
120{
121}
122
123static 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),
149 numa_drop_read(&sd->drop_counters),
150 READ_ONCE(sd->time_squeeze), 0,
151 0, 0, 0, 0, /* was fastroute */
152 0, /* was cpu_collision */
153 READ_ONCE(sd->received_rps), flow_limit_count,
154 input_qlen + process_qlen, (int)seq->index,
155 input_qlen, process_qlen);
156 return 0;
157}
158
159static const struct seq_operations dev_seq_ops = {
160 .start = dev_seq_start,
161 .next = dev_seq_next,
162 .stop = dev_seq_stop,
163 .show = dev_seq_show,
164};
165
166static const struct seq_operations softnet_seq_ops = {
167 .start = softnet_seq_start,
168 .next = softnet_seq_next,
169 .stop = softnet_seq_stop,
170 .show = softnet_seq_show,
171};
172
173struct ptype_iter_state {
174 struct seq_net_private p;
175 struct net_device *dev;
176};
177
178static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
179{
180 struct ptype_iter_state *iter = seq->private;
181 struct list_head *ptype_list = NULL;
182 struct packet_type *pt = NULL;
183 struct net_device *dev;
184 loff_t i = 0;
185 int t;
186
187 for_each_netdev_rcu(seq_file_net(seq), dev) {
188 ptype_list = &dev->ptype_all;
189 list_for_each_entry_rcu(pt, ptype_list, list) {
190 if (i == pos) {
191 iter->dev = dev;
192 return pt;
193 }
194 ++i;
195 }
196 }
197
198 iter->dev = NULL;
199
200 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_all, list) {
201 if (i == pos)
202 return pt;
203 ++i;
204 }
205
206 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_specific, list) {
207 if (i == pos)
208 return pt;
209 ++i;
210 }
211
212 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
213 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
214 if (i == pos)
215 return pt;
216 ++i;
217 }
218 }
219 return NULL;
220}
221
222static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
223 __acquires(RCU)
224{
225 rcu_read_lock();
226 return *pos ? ptype_get_idx(seq, *pos - 1) : SEQ_START_TOKEN;
227}
228
229static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
230{
231 struct ptype_iter_state *iter = seq->private;
232 struct net *net = seq_file_net(seq);
233 struct net_device *dev;
234 struct packet_type *pt;
235 struct list_head *nxt;
236 int hash;
237
238 ++*pos;
239 if (v == SEQ_START_TOKEN)
240 return ptype_get_idx(seq, 0);
241
242 pt = v;
243 nxt = READ_ONCE(pt->list.next);
244 dev = iter->dev;
245 if (dev) {
246 if (nxt != &dev->ptype_all)
247 goto found;
248
249 for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
250 nxt = READ_ONCE(dev->ptype_all.next);
251 if (nxt != &dev->ptype_all) {
252 iter->dev = dev;
253 goto found;
254 }
255 }
256 iter->dev = NULL;
257 nxt = READ_ONCE(net->ptype_all.next);
258 goto net_ptype_all;
259 }
260
261 if (pt->af_packet_net) {
262net_ptype_all:
263 if (nxt != &net->ptype_all && nxt != &net->ptype_specific)
264 goto found;
265
266 if (nxt == &net->ptype_all) {
267 /* continue with ->ptype_specific if it's not empty */
268 nxt = READ_ONCE(net->ptype_specific.next);
269 if (nxt != &net->ptype_specific)
270 goto found;
271 }
272
273 hash = 0;
274 nxt = READ_ONCE(ptype_base[0].next);
275 } else
276 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
277
278 while (nxt == &ptype_base[hash]) {
279 if (++hash >= PTYPE_HASH_SIZE)
280 return NULL;
281 nxt = READ_ONCE(ptype_base[hash].next);
282 }
283found:
284 return list_entry(nxt, struct packet_type, list);
285}
286
287static void ptype_seq_stop(struct seq_file *seq, void *v)
288 __releases(RCU)
289{
290 rcu_read_unlock();
291}
292
293static int ptype_seq_show(struct seq_file *seq, void *v)
294{
295 struct ptype_iter_state *iter = seq->private;
296 struct packet_type *pt = v;
297 struct net_device *dev;
298
299 if (v == SEQ_START_TOKEN) {
300 seq_puts(seq, "Type Device Function\n");
301 return 0;
302 }
303 dev = iter->dev;
304 if ((!pt->af_packet_net || net_eq(pt->af_packet_net, seq_file_net(seq))) &&
305 (!dev || net_eq(dev_net(dev), seq_file_net(seq)))) {
306 if (pt->type == htons(ETH_P_ALL))
307 seq_puts(seq, "ALL ");
308 else
309 seq_printf(seq, "%04x", ntohs(pt->type));
310
311 seq_printf(seq, " %-8s %ps\n",
312 dev ? dev->name : "", pt->func);
313 }
314
315 return 0;
316}
317
318static const struct seq_operations ptype_seq_ops = {
319 .start = ptype_seq_start,
320 .next = ptype_seq_next,
321 .stop = ptype_seq_stop,
322 .show = ptype_seq_show,
323};
324
325static int __net_init dev_proc_net_init(struct net *net)
326{
327 int rc = -ENOMEM;
328
329 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
330 sizeof(struct seq_net_private)))
331 goto out;
332 if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
333 &softnet_seq_ops))
334 goto out_dev;
335 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
336 sizeof(struct ptype_iter_state)))
337 goto out_softnet;
338
339 if (wext_proc_init(net))
340 goto out_ptype;
341 rc = 0;
342out:
343 return rc;
344out_ptype:
345 remove_proc_entry("ptype", net->proc_net);
346out_softnet:
347 remove_proc_entry("softnet_stat", net->proc_net);
348out_dev:
349 remove_proc_entry("dev", net->proc_net);
350 goto out;
351}
352
353static void __net_exit dev_proc_net_exit(struct net *net)
354{
355 wext_proc_exit(net);
356
357 remove_proc_entry("ptype", net->proc_net);
358 remove_proc_entry("softnet_stat", net->proc_net);
359 remove_proc_entry("dev", net->proc_net);
360}
361
362static struct pernet_operations __net_initdata dev_proc_ops = {
363 .init = dev_proc_net_init,
364 .exit = dev_proc_net_exit,
365};
366
367static int dev_mc_seq_show(struct seq_file *seq, void *v)
368{
369 struct netdev_hw_addr *ha;
370 struct net_device *dev = v;
371
372 if (v == SEQ_START_TOKEN)
373 return 0;
374
375 netif_addr_lock_bh(dev);
376 netdev_for_each_mc_addr(ha, dev) {
377 seq_printf(seq, "%-4d %-15s %-5d %-5d %*phN\n",
378 dev->ifindex, dev->name,
379 ha->refcount, ha->global_use,
380 (int)dev->addr_len, ha->addr);
381 }
382 netif_addr_unlock_bh(dev);
383 return 0;
384}
385
386static const struct seq_operations dev_mc_seq_ops = {
387 .start = dev_seq_start,
388 .next = dev_seq_next,
389 .stop = dev_seq_stop,
390 .show = dev_mc_seq_show,
391};
392
393static int __net_init dev_mc_net_init(struct net *net)
394{
395 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
396 sizeof(struct seq_net_private)))
397 return -ENOMEM;
398 return 0;
399}
400
401static void __net_exit dev_mc_net_exit(struct net *net)
402{
403 remove_proc_entry("dev_mcast", net->proc_net);
404}
405
406static struct pernet_operations __net_initdata dev_mc_net_ops = {
407 .init = dev_mc_net_init,
408 .exit = dev_mc_net_exit,
409};
410
411int __init dev_proc_init(void)
412{
413 int ret = register_pernet_subsys(&dev_proc_ops);
414 if (!ret)
415 return register_pernet_subsys(&dev_mc_net_ops);
416 return ret;
417}