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