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