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 | |
7 | #include "dev.h" |
8 | |
9 | #define BUCKET_SPACE (32 - NETDEV_HASHBITS - 1) |
10 | |
11 | #define get_bucket(x) ((x) >> BUCKET_SPACE) |
12 | #define get_offset(x) ((x) & ((1 << BUCKET_SPACE) - 1)) |
13 | #define set_bucket_offset(b, o) ((b) << BUCKET_SPACE | (o)) |
14 | |
15 | static inline struct net_device *dev_from_same_bucket(struct seq_file *seq, loff_t *pos) |
16 | { |
17 | struct net *net = seq_file_net(seq); |
18 | struct net_device *dev; |
19 | struct hlist_head *h; |
20 | unsigned int count = 0, offset = get_offset(*pos); |
21 | |
22 | h = &net->dev_index_head[get_bucket(*pos)]; |
23 | hlist_for_each_entry_rcu(dev, h, index_hlist) { |
24 | if (++count == offset) |
25 | return dev; |
26 | } |
27 | |
28 | return NULL; |
29 | } |
30 | |
31 | static inline struct net_device *dev_from_bucket(struct seq_file *seq, loff_t *pos) |
32 | { |
33 | struct net_device *dev; |
34 | unsigned int bucket; |
35 | |
36 | do { |
37 | dev = dev_from_same_bucket(seq, pos); |
38 | if (dev) |
39 | return dev; |
40 | |
41 | bucket = get_bucket(*pos) + 1; |
42 | *pos = set_bucket_offset(bucket, 1); |
43 | } while (bucket < NETDEV_HASHENTRIES); |
44 | |
45 | return NULL; |
46 | } |
47 | |
48 | /* |
49 | * This is invoked by the /proc filesystem handler to display a device |
50 | * in detail. |
51 | */ |
52 | static void *dev_seq_start(struct seq_file *seq, loff_t *pos) |
53 | __acquires(RCU) |
54 | { |
55 | rcu_read_lock(); |
56 | if (!*pos) |
57 | return SEQ_START_TOKEN; |
58 | |
59 | if (get_bucket(*pos) >= NETDEV_HASHENTRIES) |
60 | return NULL; |
61 | |
62 | return dev_from_bucket(seq, pos); |
63 | } |
64 | |
65 | static void *dev_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
66 | { |
67 | ++*pos; |
68 | return dev_from_bucket(seq, pos); |
69 | } |
70 | |
71 | static void dev_seq_stop(struct seq_file *seq, void *v) |
72 | __releases(RCU) |
73 | { |
74 | rcu_read_unlock(); |
75 | } |
76 | |
77 | static void dev_seq_printf_stats(struct seq_file *seq, struct net_device *dev) |
78 | { |
79 | struct rtnl_link_stats64 temp; |
80 | const struct rtnl_link_stats64 *stats = dev_get_stats(dev, storage: &temp); |
81 | |
82 | seq_printf(m: seq, fmt: "%6s: %7llu %7llu %4llu %4llu %4llu %5llu %10llu %9llu " |
83 | "%8llu %7llu %4llu %4llu %4llu %5llu %7llu %10llu\n" , |
84 | dev->name, stats->rx_bytes, stats->rx_packets, |
85 | stats->rx_errors, |
86 | stats->rx_dropped + stats->rx_missed_errors, |
87 | stats->rx_fifo_errors, |
88 | stats->rx_length_errors + stats->rx_over_errors + |
89 | stats->rx_crc_errors + stats->rx_frame_errors, |
90 | stats->rx_compressed, stats->multicast, |
91 | stats->tx_bytes, stats->tx_packets, |
92 | stats->tx_errors, stats->tx_dropped, |
93 | stats->tx_fifo_errors, stats->collisions, |
94 | stats->tx_carrier_errors + |
95 | stats->tx_aborted_errors + |
96 | stats->tx_window_errors + |
97 | stats->tx_heartbeat_errors, |
98 | stats->tx_compressed); |
99 | } |
100 | |
101 | /* |
102 | * Called from the PROCfs module. This now uses the new arbitrary sized |
103 | * /proc/net interface to create /proc/net/dev |
104 | */ |
105 | static int dev_seq_show(struct seq_file *seq, void *v) |
106 | { |
107 | if (v == SEQ_START_TOKEN) |
108 | seq_puts(m: seq, s: "Inter-| Receive " |
109 | " | Transmit\n" |
110 | " face |bytes packets errs drop fifo frame " |
111 | "compressed multicast|bytes packets errs " |
112 | "drop fifo colls carrier compressed\n" ); |
113 | else |
114 | dev_seq_printf_stats(seq, dev: v); |
115 | return 0; |
116 | } |
117 | |
118 | static u32 softnet_input_pkt_queue_len(struct softnet_data *sd) |
119 | { |
120 | return skb_queue_len_lockless(list_: &sd->input_pkt_queue); |
121 | } |
122 | |
123 | static u32 softnet_process_queue_len(struct softnet_data *sd) |
124 | { |
125 | return skb_queue_len_lockless(list_: &sd->process_queue); |
126 | } |
127 | |
128 | static struct softnet_data *softnet_get_online(loff_t *pos) |
129 | { |
130 | struct softnet_data *sd = NULL; |
131 | |
132 | while (*pos < nr_cpu_ids) |
133 | if (cpu_online(cpu: *pos)) { |
134 | sd = &per_cpu(softnet_data, *pos); |
135 | break; |
136 | } else |
137 | ++*pos; |
138 | return sd; |
139 | } |
140 | |
141 | static void *softnet_seq_start(struct seq_file *seq, loff_t *pos) |
142 | { |
143 | return softnet_get_online(pos); |
144 | } |
145 | |
146 | static void *softnet_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
147 | { |
148 | ++*pos; |
149 | return softnet_get_online(pos); |
150 | } |
151 | |
152 | static void softnet_seq_stop(struct seq_file *seq, void *v) |
153 | { |
154 | } |
155 | |
156 | static int softnet_seq_show(struct seq_file *seq, void *v) |
157 | { |
158 | struct softnet_data *sd = v; |
159 | u32 input_qlen = softnet_input_pkt_queue_len(sd); |
160 | u32 process_qlen = softnet_process_queue_len(sd); |
161 | unsigned int flow_limit_count = 0; |
162 | |
163 | #ifdef CONFIG_NET_FLOW_LIMIT |
164 | struct sd_flow_limit *fl; |
165 | |
166 | rcu_read_lock(); |
167 | fl = rcu_dereference(sd->flow_limit); |
168 | if (fl) |
169 | flow_limit_count = fl->count; |
170 | rcu_read_unlock(); |
171 | #endif |
172 | |
173 | /* the index is the CPU id owing this sd. Since offline CPUs are not |
174 | * displayed, it would be othrwise not trivial for the user-space |
175 | * mapping the data a specific CPU |
176 | */ |
177 | seq_printf(m: seq, |
178 | fmt: "%08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x %08x " |
179 | "%08x %08x\n" , |
180 | sd->processed, sd->dropped, sd->time_squeeze, 0, |
181 | 0, 0, 0, 0, /* was fastroute */ |
182 | 0, /* was cpu_collision */ |
183 | sd->received_rps, flow_limit_count, |
184 | input_qlen + process_qlen, (int)seq->index, |
185 | input_qlen, process_qlen); |
186 | return 0; |
187 | } |
188 | |
189 | static const struct seq_operations dev_seq_ops = { |
190 | .start = dev_seq_start, |
191 | .next = dev_seq_next, |
192 | .stop = dev_seq_stop, |
193 | .show = dev_seq_show, |
194 | }; |
195 | |
196 | static const struct seq_operations softnet_seq_ops = { |
197 | .start = softnet_seq_start, |
198 | .next = softnet_seq_next, |
199 | .stop = softnet_seq_stop, |
200 | .show = softnet_seq_show, |
201 | }; |
202 | |
203 | static void *ptype_get_idx(struct seq_file *seq, loff_t pos) |
204 | { |
205 | struct list_head *ptype_list = NULL; |
206 | struct packet_type *pt = NULL; |
207 | struct net_device *dev; |
208 | loff_t i = 0; |
209 | int t; |
210 | |
211 | for_each_netdev_rcu(seq_file_net(seq), dev) { |
212 | ptype_list = &dev->ptype_all; |
213 | list_for_each_entry_rcu(pt, ptype_list, list) { |
214 | if (i == pos) |
215 | return pt; |
216 | ++i; |
217 | } |
218 | } |
219 | |
220 | list_for_each_entry_rcu(pt, &ptype_all, list) { |
221 | if (i == pos) |
222 | return pt; |
223 | ++i; |
224 | } |
225 | |
226 | for (t = 0; t < PTYPE_HASH_SIZE; t++) { |
227 | list_for_each_entry_rcu(pt, &ptype_base[t], list) { |
228 | if (i == pos) |
229 | return pt; |
230 | ++i; |
231 | } |
232 | } |
233 | return NULL; |
234 | } |
235 | |
236 | static void *ptype_seq_start(struct seq_file *seq, loff_t *pos) |
237 | __acquires(RCU) |
238 | { |
239 | rcu_read_lock(); |
240 | return *pos ? ptype_get_idx(seq, pos: *pos - 1) : SEQ_START_TOKEN; |
241 | } |
242 | |
243 | static void *ptype_seq_next(struct seq_file *seq, void *v, loff_t *pos) |
244 | { |
245 | struct net_device *dev; |
246 | struct packet_type *pt; |
247 | struct list_head *nxt; |
248 | int hash; |
249 | |
250 | ++*pos; |
251 | if (v == SEQ_START_TOKEN) |
252 | return ptype_get_idx(seq, pos: 0); |
253 | |
254 | pt = v; |
255 | nxt = pt->list.next; |
256 | if (pt->dev) { |
257 | if (nxt != &pt->dev->ptype_all) |
258 | goto found; |
259 | |
260 | dev = pt->dev; |
261 | for_each_netdev_continue_rcu(seq_file_net(seq), dev) { |
262 | if (!list_empty(head: &dev->ptype_all)) { |
263 | nxt = dev->ptype_all.next; |
264 | goto found; |
265 | } |
266 | } |
267 | |
268 | nxt = ptype_all.next; |
269 | goto ptype_all; |
270 | } |
271 | |
272 | if (pt->type == htons(ETH_P_ALL)) { |
273 | ptype_all: |
274 | if (nxt != &ptype_all) |
275 | goto found; |
276 | hash = 0; |
277 | nxt = ptype_base[0].next; |
278 | } else |
279 | hash = ntohs(pt->type) & PTYPE_HASH_MASK; |
280 | |
281 | while (nxt == &ptype_base[hash]) { |
282 | if (++hash >= PTYPE_HASH_SIZE) |
283 | return NULL; |
284 | nxt = ptype_base[hash].next; |
285 | } |
286 | found: |
287 | return list_entry(nxt, struct packet_type, list); |
288 | } |
289 | |
290 | static void ptype_seq_stop(struct seq_file *seq, void *v) |
291 | __releases(RCU) |
292 | { |
293 | rcu_read_unlock(); |
294 | } |
295 | |
296 | static int ptype_seq_show(struct seq_file *seq, void *v) |
297 | { |
298 | struct packet_type *pt = v; |
299 | |
300 | if (v == SEQ_START_TOKEN) |
301 | seq_puts(m: seq, s: "Type Device Function\n" ); |
302 | else if ((!pt->af_packet_net || net_eq(net1: pt->af_packet_net, net2: seq_file_net(seq))) && |
303 | (!pt->dev || net_eq(net1: dev_net(dev: pt->dev), net2: seq_file_net(seq)))) { |
304 | if (pt->type == htons(ETH_P_ALL)) |
305 | seq_puts(m: seq, s: "ALL " ); |
306 | else |
307 | seq_printf(m: seq, fmt: "%04x" , ntohs(pt->type)); |
308 | |
309 | seq_printf(m: seq, fmt: " %-8s %ps\n" , |
310 | pt->dev ? pt->dev->name : "" , pt->func); |
311 | } |
312 | |
313 | return 0; |
314 | } |
315 | |
316 | static const struct seq_operations ptype_seq_ops = { |
317 | .start = ptype_seq_start, |
318 | .next = ptype_seq_next, |
319 | .stop = ptype_seq_stop, |
320 | .show = ptype_seq_show, |
321 | }; |
322 | |
323 | static int __net_init dev_proc_net_init(struct net *net) |
324 | { |
325 | int rc = -ENOMEM; |
326 | |
327 | if (!proc_create_net("dev" , 0444, net->proc_net, &dev_seq_ops, |
328 | sizeof(struct seq_net_private))) |
329 | goto out; |
330 | if (!proc_create_seq("softnet_stat" , 0444, net->proc_net, |
331 | &softnet_seq_ops)) |
332 | goto out_dev; |
333 | if (!proc_create_net("ptype" , 0444, net->proc_net, &ptype_seq_ops, |
334 | sizeof(struct seq_net_private))) |
335 | goto out_softnet; |
336 | |
337 | if (wext_proc_init(net)) |
338 | goto out_ptype; |
339 | rc = 0; |
340 | out: |
341 | return rc; |
342 | out_ptype: |
343 | remove_proc_entry("ptype" , net->proc_net); |
344 | out_softnet: |
345 | remove_proc_entry("softnet_stat" , net->proc_net); |
346 | out_dev: |
347 | remove_proc_entry("dev" , net->proc_net); |
348 | goto out; |
349 | } |
350 | |
351 | static void __net_exit dev_proc_net_exit(struct net *net) |
352 | { |
353 | wext_proc_exit(net); |
354 | |
355 | remove_proc_entry("ptype" , net->proc_net); |
356 | remove_proc_entry("softnet_stat" , net->proc_net); |
357 | remove_proc_entry("dev" , net->proc_net); |
358 | } |
359 | |
360 | static struct pernet_operations __net_initdata dev_proc_ops = { |
361 | .init = dev_proc_net_init, |
362 | .exit = dev_proc_net_exit, |
363 | }; |
364 | |
365 | static int dev_mc_seq_show(struct seq_file *seq, void *v) |
366 | { |
367 | struct netdev_hw_addr *ha; |
368 | struct net_device *dev = v; |
369 | |
370 | if (v == SEQ_START_TOKEN) |
371 | return 0; |
372 | |
373 | netif_addr_lock_bh(dev); |
374 | netdev_for_each_mc_addr(ha, dev) { |
375 | seq_printf(m: seq, fmt: "%-4d %-15s %-5d %-5d %*phN\n" , |
376 | dev->ifindex, dev->name, |
377 | ha->refcount, ha->global_use, |
378 | (int)dev->addr_len, ha->addr); |
379 | } |
380 | netif_addr_unlock_bh(dev); |
381 | return 0; |
382 | } |
383 | |
384 | static const struct seq_operations dev_mc_seq_ops = { |
385 | .start = dev_seq_start, |
386 | .next = dev_seq_next, |
387 | .stop = dev_seq_stop, |
388 | .show = dev_mc_seq_show, |
389 | }; |
390 | |
391 | static int __net_init dev_mc_net_init(struct net *net) |
392 | { |
393 | if (!proc_create_net("dev_mcast" , 0, net->proc_net, &dev_mc_seq_ops, |
394 | sizeof(struct seq_net_private))) |
395 | return -ENOMEM; |
396 | return 0; |
397 | } |
398 | |
399 | static void __net_exit dev_mc_net_exit(struct net *net) |
400 | { |
401 | remove_proc_entry("dev_mcast" , net->proc_net); |
402 | } |
403 | |
404 | static struct pernet_operations __net_initdata dev_mc_net_ops = { |
405 | .init = dev_mc_net_init, |
406 | .exit = dev_mc_net_exit, |
407 | }; |
408 | |
409 | int __init dev_proc_init(void) |
410 | { |
411 | int ret = register_pernet_subsys(&dev_proc_ops); |
412 | if (!ret) |
413 | return register_pernet_subsys(&dev_mc_net_ops); |
414 | return ret; |
415 | } |
416 | |