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 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(m: seq,
145 fmt: "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x "
146 "%08x %08x\n",
147 sd->processed, sd->dropped, sd->time_squeeze, 0,
148 0, 0, 0, 0, /* was fastroute */
149 0, /* was cpu_collision */
150 sd->received_rps, flow_limit_count,
151 input_qlen + process_qlen, (int)seq->index,
152 input_qlen, process_qlen);
153 return 0;
154}
155
156static const struct seq_operations dev_seq_ops = {
157 .start = dev_seq_start,
158 .next = dev_seq_next,
159 .stop = dev_seq_stop,
160 .show = dev_seq_show,
161};
162
163static const struct seq_operations softnet_seq_ops = {
164 .start = softnet_seq_start,
165 .next = softnet_seq_next,
166 .stop = softnet_seq_stop,
167 .show = softnet_seq_show,
168};
169
170static void *ptype_get_idx(struct seq_file *seq, loff_t pos)
171{
172 struct list_head *ptype_list = NULL;
173 struct packet_type *pt = NULL;
174 struct net_device *dev;
175 loff_t i = 0;
176 int t;
177
178 for_each_netdev_rcu(seq_file_net(seq), dev) {
179 ptype_list = &dev->ptype_all;
180 list_for_each_entry_rcu(pt, ptype_list, list) {
181 if (i == pos)
182 return pt;
183 ++i;
184 }
185 }
186
187 list_for_each_entry_rcu(pt, &net_hotdata.ptype_all, list) {
188 if (i == pos)
189 return pt;
190 ++i;
191 }
192
193 for (t = 0; t < PTYPE_HASH_SIZE; t++) {
194 list_for_each_entry_rcu(pt, &ptype_base[t], list) {
195 if (i == pos)
196 return pt;
197 ++i;
198 }
199 }
200 return NULL;
201}
202
203static void *ptype_seq_start(struct seq_file *seq, loff_t *pos)
204 __acquires(RCU)
205{
206 rcu_read_lock();
207 return *pos ? ptype_get_idx(seq, pos: *pos - 1) : SEQ_START_TOKEN;
208}
209
210static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos)
211{
212 struct net_device *dev;
213 struct packet_type *pt;
214 struct list_head *nxt;
215 int hash;
216
217 ++*pos;
218 if (v == SEQ_START_TOKEN)
219 return ptype_get_idx(seq, pos: 0);
220
221 pt = v;
222 nxt = pt->list.next;
223 if (pt->dev) {
224 if (nxt != &pt->dev->ptype_all)
225 goto found;
226
227 dev = pt->dev;
228 for_each_netdev_continue_rcu(seq_file_net(seq), dev) {
229 if (!list_empty(head: &dev->ptype_all)) {
230 nxt = dev->ptype_all.next;
231 goto found;
232 }
233 }
234
235 nxt = net_hotdata.ptype_all.next;
236 goto ptype_all;
237 }
238
239 if (pt->type == htons(ETH_P_ALL)) {
240ptype_all:
241 if (nxt != &net_hotdata.ptype_all)
242 goto found;
243 hash = 0;
244 nxt = ptype_base[0].next;
245 } else
246 hash = ntohs(pt->type) & PTYPE_HASH_MASK;
247
248 while (nxt == &ptype_base[hash]) {
249 if (++hash >= PTYPE_HASH_SIZE)
250 return NULL;
251 nxt = ptype_base[hash].next;
252 }
253found:
254 return list_entry(nxt, struct packet_type, list);
255}
256
257static void ptype_seq_stop(struct seq_file *seq, void *v)
258 __releases(RCU)
259{
260 rcu_read_unlock();
261}
262
263static int ptype_seq_show(struct seq_file *seq, void *v)
264{
265 struct packet_type *pt = v;
266
267 if (v == SEQ_START_TOKEN)
268 seq_puts(m: seq, s: "Type Device Function\n");
269 else if ((!pt->af_packet_net || net_eq(net1: pt->af_packet_net, net2: seq_file_net(seq))) &&
270 (!pt->dev || net_eq(net1: dev_net(dev: pt->dev), net2: seq_file_net(seq)))) {
271 if (pt->type == htons(ETH_P_ALL))
272 seq_puts(m: seq, s: "ALL ");
273 else
274 seq_printf(m: seq, fmt: "%04x", ntohs(pt->type));
275
276 seq_printf(m: seq, fmt: " %-8s %ps\n",
277 pt->dev ? pt->dev->name : "", pt->func);
278 }
279
280 return 0;
281}
282
283static const struct seq_operations ptype_seq_ops = {
284 .start = ptype_seq_start,
285 .next = ptype_seq_next,
286 .stop = ptype_seq_stop,
287 .show = ptype_seq_show,
288};
289
290static int __net_init dev_proc_net_init(struct net *net)
291{
292 int rc = -ENOMEM;
293
294 if (!proc_create_net("dev", 0444, net->proc_net, &dev_seq_ops,
295 sizeof(struct seq_net_private)))
296 goto out;
297 if (!proc_create_seq("softnet_stat", 0444, net->proc_net,
298 &softnet_seq_ops))
299 goto out_dev;
300 if (!proc_create_net("ptype", 0444, net->proc_net, &ptype_seq_ops,
301 sizeof(struct seq_net_private)))
302 goto out_softnet;
303
304 if (wext_proc_init(net))
305 goto out_ptype;
306 rc = 0;
307out:
308 return rc;
309out_ptype:
310 remove_proc_entry("ptype", net->proc_net);
311out_softnet:
312 remove_proc_entry("softnet_stat", net->proc_net);
313out_dev:
314 remove_proc_entry("dev", net->proc_net);
315 goto out;
316}
317
318static void __net_exit dev_proc_net_exit(struct net *net)
319{
320 wext_proc_exit(net);
321
322 remove_proc_entry("ptype", net->proc_net);
323 remove_proc_entry("softnet_stat", net->proc_net);
324 remove_proc_entry("dev", net->proc_net);
325}
326
327static struct pernet_operations __net_initdata dev_proc_ops = {
328 .init = dev_proc_net_init,
329 .exit = dev_proc_net_exit,
330};
331
332static int dev_mc_seq_show(struct seq_file *seq, void *v)
333{
334 struct netdev_hw_addr *ha;
335 struct net_device *dev = v;
336
337 if (v == SEQ_START_TOKEN)
338 return 0;
339
340 netif_addr_lock_bh(dev);
341 netdev_for_each_mc_addr(ha, dev) {
342 seq_printf(m: seq, fmt: "%-4d %-15s %-5d %-5d %*phN\n",
343 dev->ifindex, dev->name,
344 ha->refcount, ha->global_use,
345 (int)dev->addr_len, ha->addr);
346 }
347 netif_addr_unlock_bh(dev);
348 return 0;
349}
350
351static const struct seq_operations dev_mc_seq_ops = {
352 .start = dev_seq_start,
353 .next = dev_seq_next,
354 .stop = dev_seq_stop,
355 .show = dev_mc_seq_show,
356};
357
358static int __net_init dev_mc_net_init(struct net *net)
359{
360 if (!proc_create_net("dev_mcast", 0, net->proc_net, &dev_mc_seq_ops,
361 sizeof(struct seq_net_private)))
362 return -ENOMEM;
363 return 0;
364}
365
366static void __net_exit dev_mc_net_exit(struct net *net)
367{
368 remove_proc_entry("dev_mcast", net->proc_net);
369}
370
371static struct pernet_operations __net_initdata dev_mc_net_ops = {
372 .init = dev_mc_net_init,
373 .exit = dev_mc_net_exit,
374};
375
376int __init dev_proc_init(void)
377{
378 int ret = register_pernet_subsys(&dev_proc_ops);
379 if (!ret)
380 return register_pernet_subsys(&dev_mc_net_ops);
381 return ret;
382}
383

source code of linux/net/core/net-procfs.c