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, storage: &temp);
48
49 seq_printf(m: seq, fmt: "%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(m: seq, s: "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, dev: v);
82 return 0;
83}
84
85static u32 softnet_input_pkt_queue_len(struct softnet_data *sd)
86{
87 return skb_queue_len_lockless(list_: &sd->input_pkt_queue);
88}
89
90static u32 softnet_process_queue_len(struct softnet_data *sd)
91{
92 return skb_queue_len_lockless(list_: &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(cpu: *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(m: seq,
146 fmt: "%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(ndc: &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
173static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
174{
175 struct list_head *ptype_list = NULL;
176 struct packet_type *pt = NULL;
177 struct net_device *dev;
178 loff_t i = 0;
179 int t;
180
181 for_each_netdev_rcu(seq_file_net(seq), dev) {
182 ptype_list = &dev->ptype_all;
183 list_for_each_entry_rcu(pt, ptype_list, list) {
184 if (i == pos)
185 return pt;
186 ++i;
187 }
188 }
189
190 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_all, list) {
191 if (i == pos)
192 return pt;
193 ++i;
194 }
195
196 list_for_each_entry_rcu(pt, &seq_file_net(seq)->ptype_specific, list) {
197 if (i == pos)
198 return pt;
199 ++i;
200 }
201
202 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
203 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
204 if (i == pos)
205 return pt;
206 ++i;
207 }
208 }
209 return NULL;
210}
211
212static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
213 __acquires(RCU)
214{
215 rcu_read_lock();
216 return *pos ? ptype_get_idx(seq, pos: *pos - 1) : SEQ_START_TOKEN;
217}
218
219static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
220{
221 struct net *net = seq_file_net(seq);
222 struct net_device *dev;
223 struct packet_type *pt;
224 struct list_head *nxt;
225 int hash;
226
227 ++*pos;
228 if (v == SEQ_START_TOKEN)
229 return ptype_get_idx(seq, pos: 0);
230
231 pt = v;
232 nxt = pt->list.next;
233 if (pt->dev) {
234 if (nxt != &pt->dev->ptype_all)
235 goto found;
236
237 dev = pt->dev;
238 for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
239 if (!list_empty(head: &dev->ptype_all)) {
240 nxt = dev->ptype_all.next;
241 goto found;
242 }
243 }
244 nxt = net->ptype_all.next;
245 goto net_ptype_all;
246 }
247
248 if (pt->af_packet_net) {
249net_ptype_all:
250 if (nxt != &net->ptype_all && nxt != &net->ptype_specific)
251 goto found;
252
253 if (nxt == &net->ptype_all) {
254 /* continue with ->ptype_specific if it's not empty */
255 nxt = net->ptype_specific.next;
256 if (nxt != &net->ptype_specific)
257 goto found;
258 }
259
260 hash = 0;
261 nxt = ptype_base[0].next;
262 } else
263 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
264
265 while (nxt == &ptype_base[hash]) {
266 if (++hash >= PTYPE_HASH_SIZE)
267 return NULL;
268 nxt = ptype_base[hash].next;
269 }
270found:
271 return list_entry(nxt, struct packet_type, list);
272}
273
274static void ptype_seq_stop(struct seq_file *seq, void *v)
275 __releases(RCU)
276{
277 rcu_read_unlock();
278}
279
280static int ptype_seq_show(struct seq_file *seq, void *v)
281{
282 struct packet_type *pt = v;
283
284 if (v == SEQ_START_TOKEN)
285 seq_puts(m: seq, s: "Type Device Function\n");
286 else if ((!pt->af_packet_net || net_eq(net1: pt->af_packet_net, net2: seq_file_net(seq))) &&
287 (!pt->dev || net_eq(net1: dev_net(dev: pt->dev), net2: seq_file_net(seq)))) {
288 if (pt->type == htons(ETH_P_ALL))
289 seq_puts(m: seq, s: "ALL ");
290 else
291 seq_printf(m: seq, fmt: "%04x", ntohs(pt->type));
292
293 seq_printf(m: seq, fmt: " %-8s %ps\n",
294 pt->dev ? pt->dev->name : "", pt->func);
295 }
296
297 return 0;
298}
299
300static const struct seq_operations ptype_seq_ops = {
301 .start = ptype_seq_start,
302 .next = ptype_seq_next,
303 .stop = ptype_seq_stop,
304 .show = ptype_seq_show,
305};
306
307static int __net_init dev_proc_net_init(struct net *net)
308{
309 int rc = -ENOMEM;
310
311 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
312 sizeof(struct seq_net_private)))
313 goto out;
314 if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
315 &softnet_seq_ops))
316 goto out_dev;
317 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
318 sizeof(struct seq_net_private)))
319 goto out_softnet;
320
321 if (wext_proc_init(net))
322 goto out_ptype;
323 rc = 0;
324out:
325 return rc;
326out_ptype:
327 remove_proc_entry("ptype", net->proc_net);
328out_softnet:
329 remove_proc_entry("softnet_stat", net->proc_net);
330out_dev:
331 remove_proc_entry("dev", net->proc_net);
332 goto out;
333}
334
335static void __net_exit dev_proc_net_exit(struct net *net)
336{
337 wext_proc_exit(net);
338
339 remove_proc_entry("ptype", net->proc_net);
340 remove_proc_entry("softnet_stat", net->proc_net);
341 remove_proc_entry("dev", net->proc_net);
342}
343
344static struct pernet_operations __net_initdata dev_proc_ops = {
345 .init = dev_proc_net_init,
346 .exit = dev_proc_net_exit,
347};
348
349static int dev_mc_seq_show(struct seq_file *seq, void *v)
350{
351 struct netdev_hw_addr *ha;
352 struct net_device *dev = v;
353
354 if (v == SEQ_START_TOKEN)
355 return 0;
356
357 netif_addr_lock_bh(dev);
358 netdev_for_each_mc_addr(ha, dev) {
359 seq_printf(m: seq, fmt: "%-4d %-15s %-5d %-5d %*phN\n",
360 dev->ifindex, dev->name,
361 ha->refcount, ha->global_use,
362 (int)dev->addr_len, ha->addr);
363 }
364 netif_addr_unlock_bh(dev);
365 return 0;
366}
367
368static const struct seq_operations dev_mc_seq_ops = {
369 .start = dev_seq_start,
370 .next = dev_seq_next,
371 .stop = dev_seq_stop,
372 .show = dev_mc_seq_show,
373};
374
375static int __net_init dev_mc_net_init(struct net *net)
376{
377 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
378 sizeof(struct seq_net_private)))
379 return -ENOMEM;
380 return 0;
381}
382
383static void __net_exit dev_mc_net_exit(struct net *net)
384{
385 remove_proc_entry("dev_mcast", net->proc_net);
386}
387
388static struct pernet_operations __net_initdata dev_mc_net_ops = {
389 .init = dev_mc_net_init,
390 .exit = dev_mc_net_exit,
391};
392
393int __init dev_proc_init(void)
394{
395 int ret = register_pernet_subsys(&dev_proc_ops);
396 if (!ret)
397 return register_pernet_subsys(&dev_mc_net_ops);
398 return ret;
399}
400