Commit | Line | Data |
---|---|---|
09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
9a8afc8d NH |
2 | /* |
3 | * Monitoring code for network dropped packet alerts | |
4 | * | |
5 | * Copyright (C) 2009 Neil Horman <nhorman@tuxdriver.com> | |
6 | */ | |
7 | ||
e005d193 JP |
8 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
9 | ||
9a8afc8d NH |
10 | #include <linux/netdevice.h> |
11 | #include <linux/etherdevice.h> | |
12 | #include <linux/string.h> | |
13 | #include <linux/if_arp.h> | |
14 | #include <linux/inetdevice.h> | |
15 | #include <linux/inet.h> | |
16 | #include <linux/interrupt.h> | |
17 | #include <linux/netpoll.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/delay.h> | |
20 | #include <linux/types.h> | |
21 | #include <linux/workqueue.h> | |
22 | #include <linux/netlink.h> | |
23 | #include <linux/net_dropmon.h> | |
24 | #include <linux/percpu.h> | |
25 | #include <linux/timer.h> | |
26 | #include <linux/bitops.h> | |
5a0e3ad6 | 27 | #include <linux/slab.h> |
cad456d5 | 28 | #include <linux/module.h> |
edd3d007 | 29 | #include <net/drop_monitor.h> |
9a8afc8d | 30 | #include <net/genetlink.h> |
4ea7e386 | 31 | #include <net/netevent.h> |
9a8afc8d | 32 | |
ad8d75ff | 33 | #include <trace/events/skb.h> |
9cbc1cb8 | 34 | #include <trace/events/napi.h> |
9a8afc8d NH |
35 | |
36 | #include <asm/unaligned.h> | |
37 | ||
38 | #define TRACE_ON 1 | |
39 | #define TRACE_OFF 0 | |
40 | ||
9a8afc8d NH |
41 | /* |
42 | * Globals, our netlink socket pointer | |
43 | * and the work handle that will send up | |
44 | * netlink alerts | |
45 | */ | |
4ea7e386 | 46 | static int trace_state = TRACE_OFF; |
edd3d007 | 47 | static bool monitor_hw; |
dbf896b7 IS |
48 | |
49 | /* net_dm_mutex | |
50 | * | |
51 | * An overall lock guarding every operation coming from userspace. | |
52 | * It also guards the global 'hw_stats_list' list. | |
53 | */ | |
54 | static DEFINE_MUTEX(net_dm_mutex); | |
9a8afc8d | 55 | |
e9feb580 IS |
56 | struct net_dm_stats { |
57 | u64 dropped; | |
58 | struct u64_stats_sync syncp; | |
59 | }; | |
60 | ||
d40e1deb IS |
61 | #define NET_DM_MAX_HW_TRAP_NAME_LEN 40 |
62 | ||
63 | struct net_dm_hw_entry { | |
64 | char trap_name[NET_DM_MAX_HW_TRAP_NAME_LEN]; | |
65 | u32 count; | |
66 | }; | |
67 | ||
68 | struct net_dm_hw_entries { | |
69 | u32 num_entries; | |
70 | struct net_dm_hw_entry entries[0]; | |
71 | }; | |
72 | ||
9a8afc8d | 73 | struct per_cpu_dm_data { |
d40e1deb IS |
74 | spinlock_t lock; /* Protects 'skb', 'hw_entries' and |
75 | * 'send_timer' | |
76 | */ | |
77 | union { | |
78 | struct sk_buff *skb; | |
79 | struct net_dm_hw_entries *hw_entries; | |
80 | }; | |
ca30707d | 81 | struct sk_buff_head drop_queue; |
bec4596b ED |
82 | struct work_struct dm_alert_work; |
83 | struct timer_list send_timer; | |
e9feb580 | 84 | struct net_dm_stats stats; |
9a8afc8d NH |
85 | }; |
86 | ||
4ea7e386 NH |
87 | struct dm_hw_stat_delta { |
88 | struct net_device *dev; | |
5848cc09 | 89 | unsigned long last_rx; |
4ea7e386 NH |
90 | struct list_head list; |
91 | struct rcu_head rcu; | |
92 | unsigned long last_drop_val; | |
93 | }; | |
94 | ||
489111e5 | 95 | static struct genl_family net_drop_monitor_family; |
9a8afc8d NH |
96 | |
97 | static DEFINE_PER_CPU(struct per_cpu_dm_data, dm_cpu_data); | |
cac1174f | 98 | static DEFINE_PER_CPU(struct per_cpu_dm_data, dm_hw_cpu_data); |
9a8afc8d NH |
99 | |
100 | static int dm_hit_limit = 64; | |
101 | static int dm_delay = 1; | |
4ea7e386 NH |
102 | static unsigned long dm_hw_check_delta = 2*HZ; |
103 | static LIST_HEAD(hw_stats_list); | |
9a8afc8d | 104 | |
28315f79 | 105 | static enum net_dm_alert_mode net_dm_alert_mode = NET_DM_ALERT_MODE_SUMMARY; |
57986617 | 106 | static u32 net_dm_trunc_len; |
30328d46 | 107 | static u32 net_dm_queue_len = 1000; |
28315f79 IS |
108 | |
109 | struct net_dm_alert_ops { | |
110 | void (*kfree_skb_probe)(void *ignore, struct sk_buff *skb, | |
111 | void *location); | |
112 | void (*napi_poll_probe)(void *ignore, struct napi_struct *napi, | |
113 | int work, int budget); | |
114 | void (*work_item_func)(struct work_struct *work); | |
5e58109b | 115 | void (*hw_work_item_func)(struct work_struct *work); |
edd3d007 IS |
116 | void (*hw_probe)(struct sk_buff *skb, |
117 | const struct net_dm_hw_metadata *hw_metadata); | |
28315f79 IS |
118 | }; |
119 | ||
ca30707d | 120 | struct net_dm_skb_cb { |
5e58109b IS |
121 | union { |
122 | struct net_dm_hw_metadata *hw_metadata; | |
123 | void *pc; | |
124 | }; | |
ca30707d IS |
125 | }; |
126 | ||
127 | #define NET_DM_SKB_CB(__skb) ((struct net_dm_skb_cb *)&((__skb)->cb[0])) | |
128 | ||
bec4596b | 129 | static struct sk_buff *reset_per_cpu_data(struct per_cpu_dm_data *data) |
9a8afc8d NH |
130 | { |
131 | size_t al; | |
132 | struct net_dm_alert_msg *msg; | |
683703a2 | 133 | struct nlattr *nla; |
3885ca78 | 134 | struct sk_buff *skb; |
bec4596b | 135 | unsigned long flags; |
4200462d | 136 | void *msg_header; |
9a8afc8d NH |
137 | |
138 | al = sizeof(struct net_dm_alert_msg); | |
139 | al += dm_hit_limit * sizeof(struct net_dm_drop_point); | |
683703a2 NH |
140 | al += sizeof(struct nlattr); |
141 | ||
3885ca78 NH |
142 | skb = genlmsg_new(al, GFP_KERNEL); |
143 | ||
4200462d RW |
144 | if (!skb) |
145 | goto err; | |
3885ca78 | 146 | |
4200462d RW |
147 | msg_header = genlmsg_put(skb, 0, 0, &net_drop_monitor_family, |
148 | 0, NET_DM_CMD_ALERT); | |
149 | if (!msg_header) { | |
150 | nlmsg_free(skb); | |
151 | skb = NULL; | |
152 | goto err; | |
153 | } | |
154 | nla = nla_reserve(skb, NLA_UNSPEC, | |
155 | sizeof(struct net_dm_alert_msg)); | |
156 | if (!nla) { | |
157 | nlmsg_free(skb); | |
158 | skb = NULL; | |
159 | goto err; | |
160 | } | |
161 | msg = nla_data(nla); | |
162 | memset(msg, 0, al); | |
4200462d RW |
163 | goto out; |
164 | ||
165 | err: | |
166 | mod_timer(&data->send_timer, jiffies + HZ / 10); | |
167 | out: | |
bec4596b ED |
168 | spin_lock_irqsave(&data->lock, flags); |
169 | swap(data->skb, skb); | |
170 | spin_unlock_irqrestore(&data->lock, flags); | |
171 | ||
3b48ab22 RW |
172 | if (skb) { |
173 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data; | |
174 | struct genlmsghdr *gnlh = (struct genlmsghdr *)nlmsg_data(nlh); | |
175 | ||
176 | genlmsg_end(skb, genlmsg_data(gnlh)); | |
177 | } | |
178 | ||
bec4596b | 179 | return skb; |
9a8afc8d NH |
180 | } |
181 | ||
85bae4bd | 182 | static const struct genl_multicast_group dropmon_mcgrps[] = { |
2a94fe48 | 183 | { .name = "events", }, |
e5dcecba JB |
184 | }; |
185 | ||
bec4596b | 186 | static void send_dm_alert(struct work_struct *work) |
9a8afc8d NH |
187 | { |
188 | struct sk_buff *skb; | |
bec4596b | 189 | struct per_cpu_dm_data *data; |
9a8afc8d | 190 | |
bec4596b | 191 | data = container_of(work, struct per_cpu_dm_data, dm_alert_work); |
4fdcfa12 | 192 | |
bec4596b | 193 | skb = reset_per_cpu_data(data); |
9a8afc8d | 194 | |
3885ca78 | 195 | if (skb) |
68eb5503 | 196 | genlmsg_multicast(&net_drop_monitor_family, skb, 0, |
2a94fe48 | 197 | 0, GFP_KERNEL); |
9a8afc8d NH |
198 | } |
199 | ||
200 | /* | |
201 | * This is the timer function to delay the sending of an alert | |
202 | * in the event that more drops will arrive during the | |
bec4596b | 203 | * hysteresis period. |
9a8afc8d | 204 | */ |
e99e88a9 | 205 | static void sched_send_work(struct timer_list *t) |
9a8afc8d | 206 | { |
e99e88a9 | 207 | struct per_cpu_dm_data *data = from_timer(data, t, send_timer); |
3885ca78 | 208 | |
bec4596b | 209 | schedule_work(&data->dm_alert_work); |
9a8afc8d NH |
210 | } |
211 | ||
4ea7e386 | 212 | static void trace_drop_common(struct sk_buff *skb, void *location) |
9a8afc8d NH |
213 | { |
214 | struct net_dm_alert_msg *msg; | |
215 | struct nlmsghdr *nlh; | |
683703a2 | 216 | struct nlattr *nla; |
9a8afc8d | 217 | int i; |
3885ca78 | 218 | struct sk_buff *dskb; |
bec4596b ED |
219 | struct per_cpu_dm_data *data; |
220 | unsigned long flags; | |
9a8afc8d | 221 | |
bec4596b | 222 | local_irq_save(flags); |
903ceff7 | 223 | data = this_cpu_ptr(&dm_cpu_data); |
bec4596b ED |
224 | spin_lock(&data->lock); |
225 | dskb = data->skb; | |
3885ca78 NH |
226 | |
227 | if (!dskb) | |
228 | goto out; | |
229 | ||
3885ca78 | 230 | nlh = (struct nlmsghdr *)dskb->data; |
683703a2 NH |
231 | nla = genlmsg_data(nlmsg_data(nlh)); |
232 | msg = nla_data(nla); | |
9a8afc8d NH |
233 | for (i = 0; i < msg->entries; i++) { |
234 | if (!memcmp(&location, msg->points[i].pc, sizeof(void *))) { | |
235 | msg->points[i].count++; | |
236 | goto out; | |
237 | } | |
238 | } | |
bec4596b ED |
239 | if (msg->entries == dm_hit_limit) |
240 | goto out; | |
9a8afc8d NH |
241 | /* |
242 | * We need to create a new entry | |
243 | */ | |
3885ca78 | 244 | __nla_reserve_nohdr(dskb, sizeof(struct net_dm_drop_point)); |
683703a2 | 245 | nla->nla_len += NLA_ALIGN(sizeof(struct net_dm_drop_point)); |
9a8afc8d NH |
246 | memcpy(msg->points[msg->entries].pc, &location, sizeof(void *)); |
247 | msg->points[msg->entries].count = 1; | |
248 | msg->entries++; | |
249 | ||
250 | if (!timer_pending(&data->send_timer)) { | |
251 | data->send_timer.expires = jiffies + dm_delay * HZ; | |
bec4596b | 252 | add_timer(&data->send_timer); |
9a8afc8d NH |
253 | } |
254 | ||
255 | out: | |
bec4596b | 256 | spin_unlock_irqrestore(&data->lock, flags); |
9a8afc8d NH |
257 | } |
258 | ||
38516ab5 | 259 | static void trace_kfree_skb_hit(void *ignore, struct sk_buff *skb, void *location) |
4ea7e386 NH |
260 | { |
261 | trace_drop_common(skb, location); | |
262 | } | |
263 | ||
1db19db7 JDB |
264 | static void trace_napi_poll_hit(void *ignore, struct napi_struct *napi, |
265 | int work, int budget) | |
4ea7e386 NH |
266 | { |
267 | struct dm_hw_stat_delta *new_stat; | |
268 | ||
269 | /* | |
5848cc09 | 270 | * Don't check napi structures with no associated device |
4ea7e386 | 271 | */ |
5848cc09 | 272 | if (!napi->dev) |
4ea7e386 NH |
273 | return; |
274 | ||
275 | rcu_read_lock(); | |
276 | list_for_each_entry_rcu(new_stat, &hw_stats_list, list) { | |
5848cc09 NH |
277 | /* |
278 | * only add a note to our monitor buffer if: | |
279 | * 1) this is the dev we received on | |
280 | * 2) its after the last_rx delta | |
281 | * 3) our rx_dropped count has gone up | |
282 | */ | |
4ea7e386 | 283 | if ((new_stat->dev == napi->dev) && |
5848cc09 | 284 | (time_after(jiffies, new_stat->last_rx + dm_hw_check_delta)) && |
4ea7e386 NH |
285 | (napi->dev->stats.rx_dropped != new_stat->last_drop_val)) { |
286 | trace_drop_common(NULL, NULL); | |
287 | new_stat->last_drop_val = napi->dev->stats.rx_dropped; | |
5848cc09 | 288 | new_stat->last_rx = jiffies; |
4ea7e386 NH |
289 | break; |
290 | } | |
291 | } | |
292 | rcu_read_unlock(); | |
293 | } | |
294 | ||
d40e1deb IS |
295 | static struct net_dm_hw_entries * |
296 | net_dm_hw_reset_per_cpu_data(struct per_cpu_dm_data *hw_data) | |
297 | { | |
298 | struct net_dm_hw_entries *hw_entries; | |
299 | unsigned long flags; | |
300 | ||
301 | hw_entries = kzalloc(struct_size(hw_entries, entries, dm_hit_limit), | |
302 | GFP_KERNEL); | |
303 | if (!hw_entries) { | |
304 | /* If the memory allocation failed, we try to perform another | |
305 | * allocation in 1/10 second. Otherwise, the probe function | |
306 | * will constantly bail out. | |
307 | */ | |
308 | mod_timer(&hw_data->send_timer, jiffies + HZ / 10); | |
309 | } | |
310 | ||
311 | spin_lock_irqsave(&hw_data->lock, flags); | |
312 | swap(hw_data->hw_entries, hw_entries); | |
313 | spin_unlock_irqrestore(&hw_data->lock, flags); | |
314 | ||
315 | return hw_entries; | |
316 | } | |
317 | ||
318 | static int net_dm_hw_entry_put(struct sk_buff *msg, | |
319 | const struct net_dm_hw_entry *hw_entry) | |
320 | { | |
321 | struct nlattr *attr; | |
322 | ||
323 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_ENTRY); | |
324 | if (!attr) | |
325 | return -EMSGSIZE; | |
326 | ||
327 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_NAME, hw_entry->trap_name)) | |
328 | goto nla_put_failure; | |
329 | ||
330 | if (nla_put_u32(msg, NET_DM_ATTR_HW_TRAP_COUNT, hw_entry->count)) | |
331 | goto nla_put_failure; | |
332 | ||
333 | nla_nest_end(msg, attr); | |
334 | ||
335 | return 0; | |
336 | ||
337 | nla_put_failure: | |
338 | nla_nest_cancel(msg, attr); | |
339 | return -EMSGSIZE; | |
340 | } | |
341 | ||
342 | static int net_dm_hw_entries_put(struct sk_buff *msg, | |
343 | const struct net_dm_hw_entries *hw_entries) | |
344 | { | |
345 | struct nlattr *attr; | |
346 | int i; | |
347 | ||
348 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_ENTRIES); | |
349 | if (!attr) | |
350 | return -EMSGSIZE; | |
351 | ||
352 | for (i = 0; i < hw_entries->num_entries; i++) { | |
353 | int rc; | |
354 | ||
355 | rc = net_dm_hw_entry_put(msg, &hw_entries->entries[i]); | |
356 | if (rc) | |
357 | goto nla_put_failure; | |
358 | } | |
359 | ||
360 | nla_nest_end(msg, attr); | |
361 | ||
362 | return 0; | |
363 | ||
364 | nla_put_failure: | |
365 | nla_nest_cancel(msg, attr); | |
366 | return -EMSGSIZE; | |
367 | } | |
368 | ||
369 | static int | |
370 | net_dm_hw_summary_report_fill(struct sk_buff *msg, | |
371 | const struct net_dm_hw_entries *hw_entries) | |
372 | { | |
373 | struct net_dm_alert_msg anc_hdr = { 0 }; | |
374 | void *hdr; | |
375 | int rc; | |
376 | ||
377 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
378 | NET_DM_CMD_ALERT); | |
379 | if (!hdr) | |
380 | return -EMSGSIZE; | |
381 | ||
382 | /* We need to put the ancillary header in order not to break user | |
383 | * space. | |
384 | */ | |
385 | if (nla_put(msg, NLA_UNSPEC, sizeof(anc_hdr), &anc_hdr)) | |
386 | goto nla_put_failure; | |
387 | ||
388 | rc = net_dm_hw_entries_put(msg, hw_entries); | |
389 | if (rc) | |
390 | goto nla_put_failure; | |
391 | ||
392 | genlmsg_end(msg, hdr); | |
393 | ||
394 | return 0; | |
395 | ||
396 | nla_put_failure: | |
397 | genlmsg_cancel(msg, hdr); | |
398 | return -EMSGSIZE; | |
399 | } | |
400 | ||
401 | static void net_dm_hw_summary_work(struct work_struct *work) | |
402 | { | |
403 | struct net_dm_hw_entries *hw_entries; | |
404 | struct per_cpu_dm_data *hw_data; | |
405 | struct sk_buff *msg; | |
406 | int rc; | |
407 | ||
408 | hw_data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
409 | ||
410 | hw_entries = net_dm_hw_reset_per_cpu_data(hw_data); | |
411 | if (!hw_entries) | |
412 | return; | |
413 | ||
414 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
415 | if (!msg) | |
416 | goto out; | |
417 | ||
418 | rc = net_dm_hw_summary_report_fill(msg, hw_entries); | |
419 | if (rc) { | |
420 | nlmsg_free(msg); | |
421 | goto out; | |
422 | } | |
423 | ||
424 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
425 | ||
426 | out: | |
427 | kfree(hw_entries); | |
428 | } | |
429 | ||
edd3d007 IS |
430 | static void |
431 | net_dm_hw_summary_probe(struct sk_buff *skb, | |
432 | const struct net_dm_hw_metadata *hw_metadata) | |
433 | { | |
d40e1deb IS |
434 | struct net_dm_hw_entries *hw_entries; |
435 | struct net_dm_hw_entry *hw_entry; | |
436 | struct per_cpu_dm_data *hw_data; | |
437 | unsigned long flags; | |
438 | int i; | |
439 | ||
440 | hw_data = this_cpu_ptr(&dm_hw_cpu_data); | |
441 | spin_lock_irqsave(&hw_data->lock, flags); | |
442 | hw_entries = hw_data->hw_entries; | |
443 | ||
444 | if (!hw_entries) | |
445 | goto out; | |
446 | ||
447 | for (i = 0; i < hw_entries->num_entries; i++) { | |
448 | hw_entry = &hw_entries->entries[i]; | |
449 | if (!strncmp(hw_entry->trap_name, hw_metadata->trap_name, | |
450 | NET_DM_MAX_HW_TRAP_NAME_LEN - 1)) { | |
451 | hw_entry->count++; | |
452 | goto out; | |
453 | } | |
454 | } | |
455 | if (WARN_ON_ONCE(hw_entries->num_entries == dm_hit_limit)) | |
456 | goto out; | |
457 | ||
458 | hw_entry = &hw_entries->entries[hw_entries->num_entries]; | |
459 | strlcpy(hw_entry->trap_name, hw_metadata->trap_name, | |
460 | NET_DM_MAX_HW_TRAP_NAME_LEN - 1); | |
461 | hw_entry->count = 1; | |
462 | hw_entries->num_entries++; | |
463 | ||
464 | if (!timer_pending(&hw_data->send_timer)) { | |
465 | hw_data->send_timer.expires = jiffies + dm_delay * HZ; | |
466 | add_timer(&hw_data->send_timer); | |
467 | } | |
468 | ||
469 | out: | |
470 | spin_unlock_irqrestore(&hw_data->lock, flags); | |
edd3d007 IS |
471 | } |
472 | ||
28315f79 IS |
473 | static const struct net_dm_alert_ops net_dm_alert_summary_ops = { |
474 | .kfree_skb_probe = trace_kfree_skb_hit, | |
475 | .napi_poll_probe = trace_napi_poll_hit, | |
476 | .work_item_func = send_dm_alert, | |
d40e1deb | 477 | .hw_work_item_func = net_dm_hw_summary_work, |
edd3d007 | 478 | .hw_probe = net_dm_hw_summary_probe, |
28315f79 IS |
479 | }; |
480 | ||
ca30707d IS |
481 | static void net_dm_packet_trace_kfree_skb_hit(void *ignore, |
482 | struct sk_buff *skb, | |
483 | void *location) | |
484 | { | |
485 | ktime_t tstamp = ktime_get_real(); | |
486 | struct per_cpu_dm_data *data; | |
487 | struct sk_buff *nskb; | |
488 | unsigned long flags; | |
489 | ||
bef17466 IS |
490 | if (!skb_mac_header_was_set(skb)) |
491 | return; | |
492 | ||
ca30707d IS |
493 | nskb = skb_clone(skb, GFP_ATOMIC); |
494 | if (!nskb) | |
495 | return; | |
496 | ||
497 | NET_DM_SKB_CB(nskb)->pc = location; | |
498 | /* Override the timestamp because we care about the time when the | |
499 | * packet was dropped. | |
500 | */ | |
501 | nskb->tstamp = tstamp; | |
502 | ||
503 | data = this_cpu_ptr(&dm_cpu_data); | |
504 | ||
505 | spin_lock_irqsave(&data->drop_queue.lock, flags); | |
30328d46 | 506 | if (skb_queue_len(&data->drop_queue) < net_dm_queue_len) |
ca30707d IS |
507 | __skb_queue_tail(&data->drop_queue, nskb); |
508 | else | |
509 | goto unlock_free; | |
510 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
511 | ||
512 | schedule_work(&data->dm_alert_work); | |
513 | ||
514 | return; | |
515 | ||
516 | unlock_free: | |
517 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
e9feb580 IS |
518 | u64_stats_update_begin(&data->stats.syncp); |
519 | data->stats.dropped++; | |
520 | u64_stats_update_end(&data->stats.syncp); | |
ca30707d IS |
521 | consume_skb(nskb); |
522 | } | |
523 | ||
524 | static void net_dm_packet_trace_napi_poll_hit(void *ignore, | |
525 | struct napi_struct *napi, | |
526 | int work, int budget) | |
527 | { | |
528 | } | |
529 | ||
530 | static size_t net_dm_in_port_size(void) | |
531 | { | |
532 | /* NET_DM_ATTR_IN_PORT nest */ | |
533 | return nla_total_size(0) + | |
534 | /* NET_DM_ATTR_PORT_NETDEV_IFINDEX */ | |
5e58109b IS |
535 | nla_total_size(sizeof(u32)) + |
536 | /* NET_DM_ATTR_PORT_NETDEV_NAME */ | |
537 | nla_total_size(IFNAMSIZ + 1); | |
ca30707d IS |
538 | } |
539 | ||
540 | #define NET_DM_MAX_SYMBOL_LEN 40 | |
541 | ||
542 | static size_t net_dm_packet_report_size(size_t payload_len) | |
543 | { | |
544 | size_t size; | |
545 | ||
546 | size = nlmsg_msg_size(GENL_HDRLEN + net_drop_monitor_family.hdrsize); | |
547 | ||
548 | return NLMSG_ALIGN(size) + | |
5e58109b IS |
549 | /* NET_DM_ATTR_ORIGIN */ |
550 | nla_total_size(sizeof(u16)) + | |
ca30707d IS |
551 | /* NET_DM_ATTR_PC */ |
552 | nla_total_size(sizeof(u64)) + | |
553 | /* NET_DM_ATTR_SYMBOL */ | |
554 | nla_total_size(NET_DM_MAX_SYMBOL_LEN + 1) + | |
555 | /* NET_DM_ATTR_IN_PORT */ | |
556 | net_dm_in_port_size() + | |
557 | /* NET_DM_ATTR_TIMESTAMP */ | |
bd1200b7 | 558 | nla_total_size(sizeof(u64)) + |
57986617 IS |
559 | /* NET_DM_ATTR_ORIG_LEN */ |
560 | nla_total_size(sizeof(u32)) + | |
ca30707d IS |
561 | /* NET_DM_ATTR_PROTO */ |
562 | nla_total_size(sizeof(u16)) + | |
563 | /* NET_DM_ATTR_PAYLOAD */ | |
564 | nla_total_size(payload_len); | |
565 | } | |
566 | ||
5e58109b IS |
567 | static int net_dm_packet_report_in_port_put(struct sk_buff *msg, int ifindex, |
568 | const char *name) | |
ca30707d IS |
569 | { |
570 | struct nlattr *attr; | |
571 | ||
572 | attr = nla_nest_start(msg, NET_DM_ATTR_IN_PORT); | |
573 | if (!attr) | |
574 | return -EMSGSIZE; | |
575 | ||
576 | if (ifindex && | |
577 | nla_put_u32(msg, NET_DM_ATTR_PORT_NETDEV_IFINDEX, ifindex)) | |
578 | goto nla_put_failure; | |
579 | ||
5e58109b IS |
580 | if (name && nla_put_string(msg, NET_DM_ATTR_PORT_NETDEV_NAME, name)) |
581 | goto nla_put_failure; | |
582 | ||
ca30707d IS |
583 | nla_nest_end(msg, attr); |
584 | ||
585 | return 0; | |
586 | ||
587 | nla_put_failure: | |
588 | nla_nest_cancel(msg, attr); | |
589 | return -EMSGSIZE; | |
590 | } | |
591 | ||
592 | static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, | |
593 | size_t payload_len) | |
594 | { | |
595 | u64 pc = (u64)(uintptr_t) NET_DM_SKB_CB(skb)->pc; | |
596 | char buf[NET_DM_MAX_SYMBOL_LEN]; | |
597 | struct nlattr *attr; | |
ca30707d IS |
598 | void *hdr; |
599 | int rc; | |
600 | ||
601 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
602 | NET_DM_CMD_PACKET_ALERT); | |
603 | if (!hdr) | |
604 | return -EMSGSIZE; | |
605 | ||
5e58109b IS |
606 | if (nla_put_u16(msg, NET_DM_ATTR_ORIGIN, NET_DM_ORIGIN_SW)) |
607 | goto nla_put_failure; | |
608 | ||
ca30707d IS |
609 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_PC, pc, NET_DM_ATTR_PAD)) |
610 | goto nla_put_failure; | |
611 | ||
612 | snprintf(buf, sizeof(buf), "%pS", NET_DM_SKB_CB(skb)->pc); | |
613 | if (nla_put_string(msg, NET_DM_ATTR_SYMBOL, buf)) | |
614 | goto nla_put_failure; | |
615 | ||
5e58109b | 616 | rc = net_dm_packet_report_in_port_put(msg, skb->skb_iif, NULL); |
ca30707d IS |
617 | if (rc) |
618 | goto nla_put_failure; | |
619 | ||
bd1200b7 IS |
620 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_TIMESTAMP, |
621 | ktime_to_ns(skb->tstamp), NET_DM_ATTR_PAD)) | |
ca30707d IS |
622 | goto nla_put_failure; |
623 | ||
57986617 IS |
624 | if (nla_put_u32(msg, NET_DM_ATTR_ORIG_LEN, skb->len)) |
625 | goto nla_put_failure; | |
626 | ||
ca30707d IS |
627 | if (!payload_len) |
628 | goto out; | |
629 | ||
630 | if (nla_put_u16(msg, NET_DM_ATTR_PROTO, be16_to_cpu(skb->protocol))) | |
631 | goto nla_put_failure; | |
632 | ||
633 | attr = skb_put(msg, nla_total_size(payload_len)); | |
634 | attr->nla_type = NET_DM_ATTR_PAYLOAD; | |
635 | attr->nla_len = nla_attr_size(payload_len); | |
636 | if (skb_copy_bits(skb, 0, nla_data(attr), payload_len)) | |
637 | goto nla_put_failure; | |
638 | ||
639 | out: | |
640 | genlmsg_end(msg, hdr); | |
641 | ||
642 | return 0; | |
643 | ||
644 | nla_put_failure: | |
645 | genlmsg_cancel(msg, hdr); | |
646 | return -EMSGSIZE; | |
647 | } | |
648 | ||
649 | #define NET_DM_MAX_PACKET_SIZE (0xffff - NLA_HDRLEN - NLA_ALIGNTO) | |
650 | ||
651 | static void net_dm_packet_report(struct sk_buff *skb) | |
652 | { | |
653 | struct sk_buff *msg; | |
654 | size_t payload_len; | |
655 | int rc; | |
656 | ||
657 | /* Make sure we start copying the packet from the MAC header */ | |
658 | if (skb->data > skb_mac_header(skb)) | |
659 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
660 | else | |
661 | skb_pull(skb, skb_mac_header(skb) - skb->data); | |
662 | ||
663 | /* Ensure packet fits inside a single netlink attribute */ | |
664 | payload_len = min_t(size_t, skb->len, NET_DM_MAX_PACKET_SIZE); | |
57986617 IS |
665 | if (net_dm_trunc_len) |
666 | payload_len = min_t(size_t, net_dm_trunc_len, payload_len); | |
ca30707d IS |
667 | |
668 | msg = nlmsg_new(net_dm_packet_report_size(payload_len), GFP_KERNEL); | |
669 | if (!msg) | |
670 | goto out; | |
671 | ||
672 | rc = net_dm_packet_report_fill(msg, skb, payload_len); | |
673 | if (rc) { | |
674 | nlmsg_free(msg); | |
675 | goto out; | |
676 | } | |
677 | ||
678 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
679 | ||
680 | out: | |
681 | consume_skb(skb); | |
682 | } | |
683 | ||
684 | static void net_dm_packet_work(struct work_struct *work) | |
685 | { | |
686 | struct per_cpu_dm_data *data; | |
687 | struct sk_buff_head list; | |
688 | struct sk_buff *skb; | |
689 | unsigned long flags; | |
690 | ||
691 | data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
692 | ||
693 | __skb_queue_head_init(&list); | |
694 | ||
695 | spin_lock_irqsave(&data->drop_queue.lock, flags); | |
696 | skb_queue_splice_tail_init(&data->drop_queue, &list); | |
697 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
698 | ||
699 | while ((skb = __skb_dequeue(&list))) | |
700 | net_dm_packet_report(skb); | |
701 | } | |
702 | ||
5e58109b IS |
703 | static size_t |
704 | net_dm_hw_packet_report_size(size_t payload_len, | |
705 | const struct net_dm_hw_metadata *hw_metadata) | |
706 | { | |
707 | size_t size; | |
708 | ||
709 | size = nlmsg_msg_size(GENL_HDRLEN + net_drop_monitor_family.hdrsize); | |
710 | ||
711 | return NLMSG_ALIGN(size) + | |
712 | /* NET_DM_ATTR_ORIGIN */ | |
713 | nla_total_size(sizeof(u16)) + | |
714 | /* NET_DM_ATTR_HW_TRAP_GROUP_NAME */ | |
715 | nla_total_size(strlen(hw_metadata->trap_group_name) + 1) + | |
716 | /* NET_DM_ATTR_HW_TRAP_NAME */ | |
717 | nla_total_size(strlen(hw_metadata->trap_name) + 1) + | |
718 | /* NET_DM_ATTR_IN_PORT */ | |
719 | net_dm_in_port_size() + | |
720 | /* NET_DM_ATTR_TIMESTAMP */ | |
bd1200b7 | 721 | nla_total_size(sizeof(u64)) + |
5e58109b IS |
722 | /* NET_DM_ATTR_ORIG_LEN */ |
723 | nla_total_size(sizeof(u32)) + | |
724 | /* NET_DM_ATTR_PROTO */ | |
725 | nla_total_size(sizeof(u16)) + | |
726 | /* NET_DM_ATTR_PAYLOAD */ | |
727 | nla_total_size(payload_len); | |
728 | } | |
729 | ||
730 | static int net_dm_hw_packet_report_fill(struct sk_buff *msg, | |
731 | struct sk_buff *skb, size_t payload_len) | |
732 | { | |
733 | struct net_dm_hw_metadata *hw_metadata; | |
734 | struct nlattr *attr; | |
5e58109b IS |
735 | void *hdr; |
736 | ||
737 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
738 | ||
739 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
740 | NET_DM_CMD_PACKET_ALERT); | |
741 | if (!hdr) | |
742 | return -EMSGSIZE; | |
743 | ||
744 | if (nla_put_u16(msg, NET_DM_ATTR_ORIGIN, NET_DM_ORIGIN_HW)) | |
745 | goto nla_put_failure; | |
746 | ||
747 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_GROUP_NAME, | |
748 | hw_metadata->trap_group_name)) | |
749 | goto nla_put_failure; | |
750 | ||
751 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_NAME, | |
752 | hw_metadata->trap_name)) | |
753 | goto nla_put_failure; | |
754 | ||
755 | if (hw_metadata->input_dev) { | |
756 | struct net_device *dev = hw_metadata->input_dev; | |
757 | int rc; | |
758 | ||
759 | rc = net_dm_packet_report_in_port_put(msg, dev->ifindex, | |
760 | dev->name); | |
761 | if (rc) | |
762 | goto nla_put_failure; | |
763 | } | |
764 | ||
bd1200b7 IS |
765 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_TIMESTAMP, |
766 | ktime_to_ns(skb->tstamp), NET_DM_ATTR_PAD)) | |
5e58109b IS |
767 | goto nla_put_failure; |
768 | ||
769 | if (nla_put_u32(msg, NET_DM_ATTR_ORIG_LEN, skb->len)) | |
770 | goto nla_put_failure; | |
771 | ||
772 | if (!payload_len) | |
773 | goto out; | |
774 | ||
775 | if (nla_put_u16(msg, NET_DM_ATTR_PROTO, be16_to_cpu(skb->protocol))) | |
776 | goto nla_put_failure; | |
777 | ||
778 | attr = skb_put(msg, nla_total_size(payload_len)); | |
779 | attr->nla_type = NET_DM_ATTR_PAYLOAD; | |
780 | attr->nla_len = nla_attr_size(payload_len); | |
781 | if (skb_copy_bits(skb, 0, nla_data(attr), payload_len)) | |
782 | goto nla_put_failure; | |
783 | ||
784 | out: | |
785 | genlmsg_end(msg, hdr); | |
786 | ||
787 | return 0; | |
788 | ||
789 | nla_put_failure: | |
790 | genlmsg_cancel(msg, hdr); | |
791 | return -EMSGSIZE; | |
792 | } | |
793 | ||
794 | static struct net_dm_hw_metadata * | |
795 | net_dm_hw_metadata_clone(const struct net_dm_hw_metadata *hw_metadata) | |
796 | { | |
797 | struct net_dm_hw_metadata *n_hw_metadata; | |
798 | const char *trap_group_name; | |
799 | const char *trap_name; | |
800 | ||
801 | n_hw_metadata = kmalloc(sizeof(*hw_metadata), GFP_ATOMIC); | |
802 | if (!n_hw_metadata) | |
803 | return NULL; | |
804 | ||
805 | trap_group_name = kmemdup(hw_metadata->trap_group_name, | |
806 | strlen(hw_metadata->trap_group_name) + 1, | |
807 | GFP_ATOMIC | __GFP_ZERO); | |
808 | if (!trap_group_name) | |
809 | goto free_hw_metadata; | |
810 | n_hw_metadata->trap_group_name = trap_group_name; | |
811 | ||
812 | trap_name = kmemdup(hw_metadata->trap_name, | |
813 | strlen(hw_metadata->trap_name) + 1, | |
814 | GFP_ATOMIC | __GFP_ZERO); | |
815 | if (!trap_name) | |
816 | goto free_trap_group; | |
817 | n_hw_metadata->trap_name = trap_name; | |
818 | ||
819 | n_hw_metadata->input_dev = hw_metadata->input_dev; | |
820 | if (n_hw_metadata->input_dev) | |
821 | dev_hold(n_hw_metadata->input_dev); | |
822 | ||
823 | return n_hw_metadata; | |
824 | ||
825 | free_trap_group: | |
826 | kfree(trap_group_name); | |
827 | free_hw_metadata: | |
828 | kfree(n_hw_metadata); | |
829 | return NULL; | |
830 | } | |
831 | ||
832 | static void | |
833 | net_dm_hw_metadata_free(const struct net_dm_hw_metadata *hw_metadata) | |
834 | { | |
835 | if (hw_metadata->input_dev) | |
836 | dev_put(hw_metadata->input_dev); | |
837 | kfree(hw_metadata->trap_name); | |
838 | kfree(hw_metadata->trap_group_name); | |
839 | kfree(hw_metadata); | |
840 | } | |
841 | ||
842 | static void net_dm_hw_packet_report(struct sk_buff *skb) | |
843 | { | |
844 | struct net_dm_hw_metadata *hw_metadata; | |
845 | struct sk_buff *msg; | |
846 | size_t payload_len; | |
847 | int rc; | |
848 | ||
849 | if (skb->data > skb_mac_header(skb)) | |
850 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
851 | else | |
852 | skb_pull(skb, skb_mac_header(skb) - skb->data); | |
853 | ||
854 | payload_len = min_t(size_t, skb->len, NET_DM_MAX_PACKET_SIZE); | |
855 | if (net_dm_trunc_len) | |
856 | payload_len = min_t(size_t, net_dm_trunc_len, payload_len); | |
857 | ||
858 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
859 | msg = nlmsg_new(net_dm_hw_packet_report_size(payload_len, hw_metadata), | |
860 | GFP_KERNEL); | |
861 | if (!msg) | |
862 | goto out; | |
863 | ||
864 | rc = net_dm_hw_packet_report_fill(msg, skb, payload_len); | |
865 | if (rc) { | |
866 | nlmsg_free(msg); | |
867 | goto out; | |
868 | } | |
869 | ||
870 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
871 | ||
872 | out: | |
873 | net_dm_hw_metadata_free(NET_DM_SKB_CB(skb)->hw_metadata); | |
874 | consume_skb(skb); | |
875 | } | |
876 | ||
877 | static void net_dm_hw_packet_work(struct work_struct *work) | |
878 | { | |
879 | struct per_cpu_dm_data *hw_data; | |
880 | struct sk_buff_head list; | |
881 | struct sk_buff *skb; | |
882 | unsigned long flags; | |
883 | ||
884 | hw_data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
885 | ||
886 | __skb_queue_head_init(&list); | |
887 | ||
888 | spin_lock_irqsave(&hw_data->drop_queue.lock, flags); | |
889 | skb_queue_splice_tail_init(&hw_data->drop_queue, &list); | |
890 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
891 | ||
892 | while ((skb = __skb_dequeue(&list))) | |
893 | net_dm_hw_packet_report(skb); | |
894 | } | |
895 | ||
edd3d007 IS |
896 | static void |
897 | net_dm_hw_packet_probe(struct sk_buff *skb, | |
898 | const struct net_dm_hw_metadata *hw_metadata) | |
899 | { | |
5e58109b IS |
900 | struct net_dm_hw_metadata *n_hw_metadata; |
901 | ktime_t tstamp = ktime_get_real(); | |
902 | struct per_cpu_dm_data *hw_data; | |
903 | struct sk_buff *nskb; | |
904 | unsigned long flags; | |
905 | ||
bef17466 IS |
906 | if (!skb_mac_header_was_set(skb)) |
907 | return; | |
908 | ||
5e58109b IS |
909 | nskb = skb_clone(skb, GFP_ATOMIC); |
910 | if (!nskb) | |
911 | return; | |
912 | ||
913 | n_hw_metadata = net_dm_hw_metadata_clone(hw_metadata); | |
914 | if (!n_hw_metadata) | |
915 | goto free; | |
916 | ||
917 | NET_DM_SKB_CB(nskb)->hw_metadata = n_hw_metadata; | |
918 | nskb->tstamp = tstamp; | |
919 | ||
920 | hw_data = this_cpu_ptr(&dm_hw_cpu_data); | |
921 | ||
922 | spin_lock_irqsave(&hw_data->drop_queue.lock, flags); | |
923 | if (skb_queue_len(&hw_data->drop_queue) < net_dm_queue_len) | |
924 | __skb_queue_tail(&hw_data->drop_queue, nskb); | |
925 | else | |
926 | goto unlock_free; | |
927 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
928 | ||
929 | schedule_work(&hw_data->dm_alert_work); | |
930 | ||
931 | return; | |
932 | ||
933 | unlock_free: | |
934 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
935 | u64_stats_update_begin(&hw_data->stats.syncp); | |
936 | hw_data->stats.dropped++; | |
937 | u64_stats_update_end(&hw_data->stats.syncp); | |
938 | net_dm_hw_metadata_free(n_hw_metadata); | |
939 | free: | |
940 | consume_skb(nskb); | |
edd3d007 IS |
941 | } |
942 | ||
ca30707d IS |
943 | static const struct net_dm_alert_ops net_dm_alert_packet_ops = { |
944 | .kfree_skb_probe = net_dm_packet_trace_kfree_skb_hit, | |
945 | .napi_poll_probe = net_dm_packet_trace_napi_poll_hit, | |
946 | .work_item_func = net_dm_packet_work, | |
5e58109b | 947 | .hw_work_item_func = net_dm_hw_packet_work, |
edd3d007 | 948 | .hw_probe = net_dm_hw_packet_probe, |
ca30707d IS |
949 | }; |
950 | ||
28315f79 IS |
951 | static const struct net_dm_alert_ops *net_dm_alert_ops_arr[] = { |
952 | [NET_DM_ALERT_MODE_SUMMARY] = &net_dm_alert_summary_ops, | |
ca30707d | 953 | [NET_DM_ALERT_MODE_PACKET] = &net_dm_alert_packet_ops, |
28315f79 IS |
954 | }; |
955 | ||
edd3d007 IS |
956 | void net_dm_hw_report(struct sk_buff *skb, |
957 | const struct net_dm_hw_metadata *hw_metadata) | |
958 | { | |
8e94c3bc IS |
959 | rcu_read_lock(); |
960 | ||
edd3d007 | 961 | if (!monitor_hw) |
8e94c3bc | 962 | goto out; |
edd3d007 IS |
963 | |
964 | net_dm_alert_ops_arr[net_dm_alert_mode]->hw_probe(skb, hw_metadata); | |
8e94c3bc IS |
965 | |
966 | out: | |
967 | rcu_read_unlock(); | |
edd3d007 IS |
968 | } |
969 | EXPORT_SYMBOL_GPL(net_dm_hw_report); | |
970 | ||
8e94c3bc IS |
971 | static int net_dm_hw_monitor_start(struct netlink_ext_ack *extack) |
972 | { | |
973 | const struct net_dm_alert_ops *ops; | |
974 | int cpu; | |
975 | ||
976 | if (monitor_hw) { | |
977 | NL_SET_ERR_MSG_MOD(extack, "Hardware monitoring already enabled"); | |
978 | return -EAGAIN; | |
979 | } | |
980 | ||
981 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; | |
982 | ||
983 | if (!try_module_get(THIS_MODULE)) { | |
984 | NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module"); | |
985 | return -ENODEV; | |
986 | } | |
987 | ||
988 | for_each_possible_cpu(cpu) { | |
989 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
990 | struct net_dm_hw_entries *hw_entries; | |
991 | ||
992 | INIT_WORK(&hw_data->dm_alert_work, ops->hw_work_item_func); | |
993 | timer_setup(&hw_data->send_timer, sched_send_work, 0); | |
994 | hw_entries = net_dm_hw_reset_per_cpu_data(hw_data); | |
995 | kfree(hw_entries); | |
996 | } | |
997 | ||
998 | monitor_hw = true; | |
999 | ||
1000 | return 0; | |
1001 | } | |
1002 | ||
1003 | static void net_dm_hw_monitor_stop(struct netlink_ext_ack *extack) | |
1004 | { | |
1005 | int cpu; | |
1006 | ||
1007 | if (!monitor_hw) | |
1008 | NL_SET_ERR_MSG_MOD(extack, "Hardware monitoring already disabled"); | |
1009 | ||
1010 | monitor_hw = false; | |
1011 | ||
1012 | /* After this call returns we are guaranteed that no CPU is processing | |
1013 | * any hardware drops. | |
1014 | */ | |
1015 | synchronize_rcu(); | |
1016 | ||
1017 | for_each_possible_cpu(cpu) { | |
1018 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1019 | struct sk_buff *skb; | |
1020 | ||
1021 | del_timer_sync(&hw_data->send_timer); | |
1022 | cancel_work_sync(&hw_data->dm_alert_work); | |
1023 | while ((skb = __skb_dequeue(&hw_data->drop_queue))) { | |
1024 | struct net_dm_hw_metadata *hw_metadata; | |
1025 | ||
1026 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
1027 | net_dm_hw_metadata_free(hw_metadata); | |
1028 | consume_skb(skb); | |
1029 | } | |
1030 | } | |
1031 | ||
1032 | module_put(THIS_MODULE); | |
1033 | } | |
1034 | ||
7c747838 IS |
1035 | static int net_dm_trace_on_set(struct netlink_ext_ack *extack) |
1036 | { | |
28315f79 | 1037 | const struct net_dm_alert_ops *ops; |
70c69274 | 1038 | int cpu, rc; |
7c747838 | 1039 | |
28315f79 IS |
1040 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; |
1041 | ||
7c747838 IS |
1042 | if (!try_module_get(THIS_MODULE)) { |
1043 | NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module"); | |
1044 | return -ENODEV; | |
1045 | } | |
1046 | ||
70c69274 IS |
1047 | for_each_possible_cpu(cpu) { |
1048 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
44075f56 | 1049 | struct sk_buff *skb; |
70c69274 | 1050 | |
28315f79 | 1051 | INIT_WORK(&data->dm_alert_work, ops->work_item_func); |
70c69274 | 1052 | timer_setup(&data->send_timer, sched_send_work, 0); |
44075f56 IS |
1053 | /* Allocate a new per-CPU skb for the summary alert message and |
1054 | * free the old one which might contain stale data from | |
1055 | * previous tracing. | |
1056 | */ | |
1057 | skb = reset_per_cpu_data(data); | |
1058 | consume_skb(skb); | |
70c69274 IS |
1059 | } |
1060 | ||
28315f79 | 1061 | rc = register_trace_kfree_skb(ops->kfree_skb_probe, NULL); |
7c747838 IS |
1062 | if (rc) { |
1063 | NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to kfree_skb() tracepoint"); | |
1064 | goto err_module_put; | |
1065 | } | |
1066 | ||
28315f79 | 1067 | rc = register_trace_napi_poll(ops->napi_poll_probe, NULL); |
7c747838 IS |
1068 | if (rc) { |
1069 | NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to napi_poll() tracepoint"); | |
1070 | goto err_unregister_trace; | |
1071 | } | |
1072 | ||
1073 | return 0; | |
1074 | ||
1075 | err_unregister_trace: | |
28315f79 | 1076 | unregister_trace_kfree_skb(ops->kfree_skb_probe, NULL); |
7c747838 IS |
1077 | err_module_put: |
1078 | module_put(THIS_MODULE); | |
1079 | return rc; | |
1080 | } | |
1081 | ||
1082 | static void net_dm_trace_off_set(void) | |
1083 | { | |
1084 | struct dm_hw_stat_delta *new_stat, *temp; | |
28315f79 | 1085 | const struct net_dm_alert_ops *ops; |
70c69274 | 1086 | int cpu; |
7c747838 | 1087 | |
28315f79 IS |
1088 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; |
1089 | ||
1090 | unregister_trace_napi_poll(ops->napi_poll_probe, NULL); | |
1091 | unregister_trace_kfree_skb(ops->kfree_skb_probe, NULL); | |
7c747838 IS |
1092 | |
1093 | tracepoint_synchronize_unregister(); | |
1094 | ||
70c69274 IS |
1095 | /* Make sure we do not send notifications to user space after request |
1096 | * to stop tracing returns. | |
1097 | */ | |
1098 | for_each_possible_cpu(cpu) { | |
1099 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
ca30707d | 1100 | struct sk_buff *skb; |
70c69274 IS |
1101 | |
1102 | del_timer_sync(&data->send_timer); | |
1103 | cancel_work_sync(&data->dm_alert_work); | |
ca30707d IS |
1104 | while ((skb = __skb_dequeue(&data->drop_queue))) |
1105 | consume_skb(skb); | |
70c69274 IS |
1106 | } |
1107 | ||
7c747838 IS |
1108 | list_for_each_entry_safe(new_stat, temp, &hw_stats_list, list) { |
1109 | if (new_stat->dev == NULL) { | |
1110 | list_del_rcu(&new_stat->list); | |
1111 | kfree_rcu(new_stat, rcu); | |
1112 | } | |
1113 | } | |
1114 | ||
1115 | module_put(THIS_MODULE); | |
1116 | } | |
1117 | ||
96510096 | 1118 | static int set_all_monitor_traces(int state, struct netlink_ext_ack *extack) |
9a8afc8d NH |
1119 | { |
1120 | int rc = 0; | |
4ea7e386 | 1121 | |
4b706372 | 1122 | if (state == trace_state) { |
96510096 | 1123 | NL_SET_ERR_MSG_MOD(extack, "Trace state already set to requested state"); |
b19d9550 | 1124 | return -EAGAIN; |
4b706372 NH |
1125 | } |
1126 | ||
9a8afc8d NH |
1127 | switch (state) { |
1128 | case TRACE_ON: | |
7c747838 | 1129 | rc = net_dm_trace_on_set(extack); |
9a8afc8d NH |
1130 | break; |
1131 | case TRACE_OFF: | |
7c747838 | 1132 | net_dm_trace_off_set(); |
9a8afc8d NH |
1133 | break; |
1134 | default: | |
1135 | rc = 1; | |
1136 | break; | |
1137 | } | |
1138 | ||
4ea7e386 NH |
1139 | if (!rc) |
1140 | trace_state = state; | |
4b706372 NH |
1141 | else |
1142 | rc = -EINPROGRESS; | |
4ea7e386 | 1143 | |
9a8afc8d NH |
1144 | return rc; |
1145 | } | |
1146 | ||
80cebed8 IS |
1147 | static bool net_dm_is_monitoring(void) |
1148 | { | |
1149 | return trace_state == TRACE_ON || monitor_hw; | |
1150 | } | |
1151 | ||
ca30707d IS |
1152 | static int net_dm_alert_mode_get_from_info(struct genl_info *info, |
1153 | enum net_dm_alert_mode *p_alert_mode) | |
1154 | { | |
1155 | u8 val; | |
1156 | ||
1157 | val = nla_get_u8(info->attrs[NET_DM_ATTR_ALERT_MODE]); | |
1158 | ||
1159 | switch (val) { | |
1160 | case NET_DM_ALERT_MODE_SUMMARY: /* fall-through */ | |
1161 | case NET_DM_ALERT_MODE_PACKET: | |
1162 | *p_alert_mode = val; | |
1163 | break; | |
1164 | default: | |
1165 | return -EINVAL; | |
1166 | } | |
1167 | ||
1168 | return 0; | |
1169 | } | |
1170 | ||
1171 | static int net_dm_alert_mode_set(struct genl_info *info) | |
1172 | { | |
1173 | struct netlink_ext_ack *extack = info->extack; | |
1174 | enum net_dm_alert_mode alert_mode; | |
1175 | int rc; | |
1176 | ||
1177 | if (!info->attrs[NET_DM_ATTR_ALERT_MODE]) | |
1178 | return 0; | |
1179 | ||
1180 | rc = net_dm_alert_mode_get_from_info(info, &alert_mode); | |
1181 | if (rc) { | |
1182 | NL_SET_ERR_MSG_MOD(extack, "Invalid alert mode"); | |
1183 | return -EINVAL; | |
1184 | } | |
1185 | ||
1186 | net_dm_alert_mode = alert_mode; | |
1187 | ||
1188 | return 0; | |
1189 | } | |
1190 | ||
57986617 IS |
1191 | static void net_dm_trunc_len_set(struct genl_info *info) |
1192 | { | |
1193 | if (!info->attrs[NET_DM_ATTR_TRUNC_LEN]) | |
1194 | return; | |
1195 | ||
1196 | net_dm_trunc_len = nla_get_u32(info->attrs[NET_DM_ATTR_TRUNC_LEN]); | |
1197 | } | |
1198 | ||
30328d46 IS |
1199 | static void net_dm_queue_len_set(struct genl_info *info) |
1200 | { | |
1201 | if (!info->attrs[NET_DM_ATTR_QUEUE_LEN]) | |
1202 | return; | |
1203 | ||
1204 | net_dm_queue_len = nla_get_u32(info->attrs[NET_DM_ATTR_QUEUE_LEN]); | |
1205 | } | |
1206 | ||
9a8afc8d NH |
1207 | static int net_dm_cmd_config(struct sk_buff *skb, |
1208 | struct genl_info *info) | |
1209 | { | |
ca30707d IS |
1210 | struct netlink_ext_ack *extack = info->extack; |
1211 | int rc; | |
96510096 | 1212 | |
80cebed8 IS |
1213 | if (net_dm_is_monitoring()) { |
1214 | NL_SET_ERR_MSG_MOD(extack, "Cannot configure drop monitor during monitoring"); | |
ca30707d IS |
1215 | return -EBUSY; |
1216 | } | |
1217 | ||
1218 | rc = net_dm_alert_mode_set(info); | |
1219 | if (rc) | |
1220 | return rc; | |
1221 | ||
57986617 IS |
1222 | net_dm_trunc_len_set(info); |
1223 | ||
30328d46 IS |
1224 | net_dm_queue_len_set(info); |
1225 | ||
ca30707d | 1226 | return 0; |
9a8afc8d NH |
1227 | } |
1228 | ||
8e94c3bc IS |
1229 | static int net_dm_monitor_start(bool set_sw, bool set_hw, |
1230 | struct netlink_ext_ack *extack) | |
1231 | { | |
1232 | bool sw_set = false; | |
1233 | int rc; | |
1234 | ||
1235 | if (set_sw) { | |
1236 | rc = set_all_monitor_traces(TRACE_ON, extack); | |
1237 | if (rc) | |
1238 | return rc; | |
1239 | sw_set = true; | |
1240 | } | |
1241 | ||
1242 | if (set_hw) { | |
1243 | rc = net_dm_hw_monitor_start(extack); | |
1244 | if (rc) | |
1245 | goto err_monitor_hw; | |
1246 | } | |
1247 | ||
1248 | return 0; | |
1249 | ||
1250 | err_monitor_hw: | |
1251 | if (sw_set) | |
1252 | set_all_monitor_traces(TRACE_OFF, extack); | |
1253 | return rc; | |
1254 | } | |
1255 | ||
1256 | static void net_dm_monitor_stop(bool set_sw, bool set_hw, | |
1257 | struct netlink_ext_ack *extack) | |
1258 | { | |
1259 | if (set_hw) | |
1260 | net_dm_hw_monitor_stop(extack); | |
1261 | if (set_sw) | |
1262 | set_all_monitor_traces(TRACE_OFF, extack); | |
1263 | } | |
1264 | ||
9a8afc8d NH |
1265 | static int net_dm_cmd_trace(struct sk_buff *skb, |
1266 | struct genl_info *info) | |
1267 | { | |
8e94c3bc IS |
1268 | bool set_sw = !!info->attrs[NET_DM_ATTR_SW_DROPS]; |
1269 | bool set_hw = !!info->attrs[NET_DM_ATTR_HW_DROPS]; | |
1270 | struct netlink_ext_ack *extack = info->extack; | |
1271 | ||
1272 | /* To maintain backward compatibility, we start / stop monitoring of | |
1273 | * software drops if no flag is specified. | |
1274 | */ | |
1275 | if (!set_sw && !set_hw) | |
1276 | set_sw = true; | |
1277 | ||
9a8afc8d NH |
1278 | switch (info->genlhdr->cmd) { |
1279 | case NET_DM_CMD_START: | |
8e94c3bc | 1280 | return net_dm_monitor_start(set_sw, set_hw, extack); |
9a8afc8d | 1281 | case NET_DM_CMD_STOP: |
8e94c3bc IS |
1282 | net_dm_monitor_stop(set_sw, set_hw, extack); |
1283 | return 0; | |
9a8afc8d NH |
1284 | } |
1285 | ||
2230a7ef | 1286 | return -EOPNOTSUPP; |
9a8afc8d NH |
1287 | } |
1288 | ||
444be061 IS |
1289 | static int net_dm_config_fill(struct sk_buff *msg, struct genl_info *info) |
1290 | { | |
1291 | void *hdr; | |
1292 | ||
1293 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, | |
1294 | &net_drop_monitor_family, 0, NET_DM_CMD_CONFIG_NEW); | |
1295 | if (!hdr) | |
1296 | return -EMSGSIZE; | |
1297 | ||
1298 | if (nla_put_u8(msg, NET_DM_ATTR_ALERT_MODE, net_dm_alert_mode)) | |
1299 | goto nla_put_failure; | |
1300 | ||
1301 | if (nla_put_u32(msg, NET_DM_ATTR_TRUNC_LEN, net_dm_trunc_len)) | |
1302 | goto nla_put_failure; | |
1303 | ||
30328d46 IS |
1304 | if (nla_put_u32(msg, NET_DM_ATTR_QUEUE_LEN, net_dm_queue_len)) |
1305 | goto nla_put_failure; | |
1306 | ||
444be061 IS |
1307 | genlmsg_end(msg, hdr); |
1308 | ||
1309 | return 0; | |
1310 | ||
1311 | nla_put_failure: | |
1312 | genlmsg_cancel(msg, hdr); | |
1313 | return -EMSGSIZE; | |
1314 | } | |
1315 | ||
1316 | static int net_dm_cmd_config_get(struct sk_buff *skb, struct genl_info *info) | |
1317 | { | |
1318 | struct sk_buff *msg; | |
1319 | int rc; | |
1320 | ||
1321 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1322 | if (!msg) | |
1323 | return -ENOMEM; | |
1324 | ||
1325 | rc = net_dm_config_fill(msg, info); | |
1326 | if (rc) | |
1327 | goto free_msg; | |
1328 | ||
1329 | return genlmsg_reply(msg, info); | |
1330 | ||
1331 | free_msg: | |
1332 | nlmsg_free(msg); | |
1333 | return rc; | |
1334 | } | |
1335 | ||
e9feb580 IS |
1336 | static void net_dm_stats_read(struct net_dm_stats *stats) |
1337 | { | |
1338 | int cpu; | |
1339 | ||
1340 | memset(stats, 0, sizeof(*stats)); | |
1341 | for_each_possible_cpu(cpu) { | |
1342 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
1343 | struct net_dm_stats *cpu_stats = &data->stats; | |
1344 | unsigned int start; | |
1345 | u64 dropped; | |
1346 | ||
1347 | do { | |
1348 | start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1349 | dropped = cpu_stats->dropped; | |
1350 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); | |
1351 | ||
1352 | stats->dropped += dropped; | |
1353 | } | |
1354 | } | |
1355 | ||
1356 | static int net_dm_stats_put(struct sk_buff *msg) | |
1357 | { | |
1358 | struct net_dm_stats stats; | |
1359 | struct nlattr *attr; | |
1360 | ||
1361 | net_dm_stats_read(&stats); | |
1362 | ||
1363 | attr = nla_nest_start(msg, NET_DM_ATTR_STATS); | |
1364 | if (!attr) | |
1365 | return -EMSGSIZE; | |
1366 | ||
1367 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_STATS_DROPPED, | |
1368 | stats.dropped, NET_DM_ATTR_PAD)) | |
1369 | goto nla_put_failure; | |
1370 | ||
1371 | nla_nest_end(msg, attr); | |
1372 | ||
1373 | return 0; | |
1374 | ||
1375 | nla_put_failure: | |
1376 | nla_nest_cancel(msg, attr); | |
1377 | return -EMSGSIZE; | |
1378 | } | |
1379 | ||
5e58109b IS |
1380 | static void net_dm_hw_stats_read(struct net_dm_stats *stats) |
1381 | { | |
1382 | int cpu; | |
1383 | ||
1384 | memset(stats, 0, sizeof(*stats)); | |
1385 | for_each_possible_cpu(cpu) { | |
1386 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1387 | struct net_dm_stats *cpu_stats = &hw_data->stats; | |
1388 | unsigned int start; | |
1389 | u64 dropped; | |
1390 | ||
1391 | do { | |
1392 | start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1393 | dropped = cpu_stats->dropped; | |
1394 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); | |
1395 | ||
1396 | stats->dropped += dropped; | |
1397 | } | |
1398 | } | |
1399 | ||
1400 | static int net_dm_hw_stats_put(struct sk_buff *msg) | |
1401 | { | |
1402 | struct net_dm_stats stats; | |
1403 | struct nlattr *attr; | |
1404 | ||
1405 | net_dm_hw_stats_read(&stats); | |
1406 | ||
1407 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_STATS); | |
1408 | if (!attr) | |
1409 | return -EMSGSIZE; | |
1410 | ||
1411 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_STATS_DROPPED, | |
1412 | stats.dropped, NET_DM_ATTR_PAD)) | |
1413 | goto nla_put_failure; | |
1414 | ||
1415 | nla_nest_end(msg, attr); | |
1416 | ||
1417 | return 0; | |
1418 | ||
1419 | nla_put_failure: | |
1420 | nla_nest_cancel(msg, attr); | |
1421 | return -EMSGSIZE; | |
1422 | } | |
1423 | ||
e9feb580 IS |
1424 | static int net_dm_stats_fill(struct sk_buff *msg, struct genl_info *info) |
1425 | { | |
1426 | void *hdr; | |
1427 | int rc; | |
1428 | ||
1429 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, | |
1430 | &net_drop_monitor_family, 0, NET_DM_CMD_STATS_NEW); | |
1431 | if (!hdr) | |
1432 | return -EMSGSIZE; | |
1433 | ||
1434 | rc = net_dm_stats_put(msg); | |
1435 | if (rc) | |
1436 | goto nla_put_failure; | |
1437 | ||
5e58109b IS |
1438 | rc = net_dm_hw_stats_put(msg); |
1439 | if (rc) | |
1440 | goto nla_put_failure; | |
1441 | ||
e9feb580 IS |
1442 | genlmsg_end(msg, hdr); |
1443 | ||
1444 | return 0; | |
1445 | ||
1446 | nla_put_failure: | |
1447 | genlmsg_cancel(msg, hdr); | |
1448 | return -EMSGSIZE; | |
1449 | } | |
1450 | ||
1451 | static int net_dm_cmd_stats_get(struct sk_buff *skb, struct genl_info *info) | |
1452 | { | |
1453 | struct sk_buff *msg; | |
1454 | int rc; | |
1455 | ||
1456 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1457 | if (!msg) | |
1458 | return -ENOMEM; | |
1459 | ||
1460 | rc = net_dm_stats_fill(msg, info); | |
1461 | if (rc) | |
1462 | goto free_msg; | |
1463 | ||
1464 | return genlmsg_reply(msg, info); | |
1465 | ||
1466 | free_msg: | |
1467 | nlmsg_free(msg); | |
1468 | return rc; | |
1469 | } | |
1470 | ||
4ea7e386 | 1471 | static int dropmon_net_event(struct notifier_block *ev_block, |
351638e7 | 1472 | unsigned long event, void *ptr) |
4ea7e386 | 1473 | { |
351638e7 | 1474 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4ea7e386 NH |
1475 | struct dm_hw_stat_delta *new_stat = NULL; |
1476 | struct dm_hw_stat_delta *tmp; | |
1477 | ||
1478 | switch (event) { | |
1479 | case NETDEV_REGISTER: | |
1480 | new_stat = kzalloc(sizeof(struct dm_hw_stat_delta), GFP_KERNEL); | |
1481 | ||
1482 | if (!new_stat) | |
1483 | goto out; | |
1484 | ||
1485 | new_stat->dev = dev; | |
5848cc09 | 1486 | new_stat->last_rx = jiffies; |
dbf896b7 | 1487 | mutex_lock(&net_dm_mutex); |
4ea7e386 | 1488 | list_add_rcu(&new_stat->list, &hw_stats_list); |
dbf896b7 | 1489 | mutex_unlock(&net_dm_mutex); |
4ea7e386 NH |
1490 | break; |
1491 | case NETDEV_UNREGISTER: | |
dbf896b7 | 1492 | mutex_lock(&net_dm_mutex); |
4ea7e386 NH |
1493 | list_for_each_entry_safe(new_stat, tmp, &hw_stats_list, list) { |
1494 | if (new_stat->dev == dev) { | |
1495 | new_stat->dev = NULL; | |
1496 | if (trace_state == TRACE_OFF) { | |
1497 | list_del_rcu(&new_stat->list); | |
fa81c0e1 | 1498 | kfree_rcu(new_stat, rcu); |
4ea7e386 NH |
1499 | break; |
1500 | } | |
1501 | } | |
1502 | } | |
dbf896b7 | 1503 | mutex_unlock(&net_dm_mutex); |
4ea7e386 NH |
1504 | break; |
1505 | } | |
1506 | out: | |
1507 | return NOTIFY_DONE; | |
1508 | } | |
9a8afc8d | 1509 | |
ca30707d IS |
1510 | static const struct nla_policy net_dm_nl_policy[NET_DM_ATTR_MAX + 1] = { |
1511 | [NET_DM_ATTR_UNSPEC] = { .strict_start_type = NET_DM_ATTR_UNSPEC + 1 }, | |
1512 | [NET_DM_ATTR_ALERT_MODE] = { .type = NLA_U8 }, | |
57986617 | 1513 | [NET_DM_ATTR_TRUNC_LEN] = { .type = NLA_U32 }, |
30328d46 | 1514 | [NET_DM_ATTR_QUEUE_LEN] = { .type = NLA_U32 }, |
8e94c3bc IS |
1515 | [NET_DM_ATTR_SW_DROPS] = {. type = NLA_FLAG }, |
1516 | [NET_DM_ATTR_HW_DROPS] = {. type = NLA_FLAG }, | |
ca30707d IS |
1517 | }; |
1518 | ||
4534de83 | 1519 | static const struct genl_ops dropmon_ops[] = { |
9a8afc8d NH |
1520 | { |
1521 | .cmd = NET_DM_CMD_CONFIG, | |
ef6243ac | 1522 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d | 1523 | .doit = net_dm_cmd_config, |
c5ab9b1c | 1524 | .flags = GENL_ADMIN_PERM, |
9a8afc8d NH |
1525 | }, |
1526 | { | |
1527 | .cmd = NET_DM_CMD_START, | |
ef6243ac | 1528 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d NH |
1529 | .doit = net_dm_cmd_trace, |
1530 | }, | |
1531 | { | |
1532 | .cmd = NET_DM_CMD_STOP, | |
ef6243ac | 1533 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d NH |
1534 | .doit = net_dm_cmd_trace, |
1535 | }, | |
444be061 IS |
1536 | { |
1537 | .cmd = NET_DM_CMD_CONFIG_GET, | |
1538 | .doit = net_dm_cmd_config_get, | |
1539 | }, | |
e9feb580 IS |
1540 | { |
1541 | .cmd = NET_DM_CMD_STATS_GET, | |
1542 | .doit = net_dm_cmd_stats_get, | |
1543 | }, | |
9a8afc8d NH |
1544 | }; |
1545 | ||
b19d9550 IS |
1546 | static int net_dm_nl_pre_doit(const struct genl_ops *ops, |
1547 | struct sk_buff *skb, struct genl_info *info) | |
1548 | { | |
1549 | mutex_lock(&net_dm_mutex); | |
1550 | ||
1551 | return 0; | |
1552 | } | |
1553 | ||
1554 | static void net_dm_nl_post_doit(const struct genl_ops *ops, | |
1555 | struct sk_buff *skb, struct genl_info *info) | |
1556 | { | |
1557 | mutex_unlock(&net_dm_mutex); | |
1558 | } | |
1559 | ||
56989f6d | 1560 | static struct genl_family net_drop_monitor_family __ro_after_init = { |
489111e5 JB |
1561 | .hdrsize = 0, |
1562 | .name = "NET_DM", | |
1563 | .version = 2, | |
ca30707d IS |
1564 | .maxattr = NET_DM_ATTR_MAX, |
1565 | .policy = net_dm_nl_policy, | |
b19d9550 IS |
1566 | .pre_doit = net_dm_nl_pre_doit, |
1567 | .post_doit = net_dm_nl_post_doit, | |
489111e5 JB |
1568 | .module = THIS_MODULE, |
1569 | .ops = dropmon_ops, | |
1570 | .n_ops = ARRAY_SIZE(dropmon_ops), | |
1571 | .mcgrps = dropmon_mcgrps, | |
1572 | .n_mcgrps = ARRAY_SIZE(dropmon_mcgrps), | |
1573 | }; | |
1574 | ||
4ea7e386 NH |
1575 | static struct notifier_block dropmon_net_notifier = { |
1576 | .notifier_call = dropmon_net_event | |
1577 | }; | |
1578 | ||
9b63f57d IS |
1579 | static void __net_dm_cpu_data_init(struct per_cpu_dm_data *data) |
1580 | { | |
1581 | spin_lock_init(&data->lock); | |
1582 | skb_queue_head_init(&data->drop_queue); | |
1583 | u64_stats_init(&data->stats.syncp); | |
1584 | } | |
1585 | ||
1586 | static void __net_dm_cpu_data_fini(struct per_cpu_dm_data *data) | |
1587 | { | |
1588 | WARN_ON(!skb_queue_empty(&data->drop_queue)); | |
1589 | } | |
1590 | ||
1591 | static void net_dm_cpu_data_init(int cpu) | |
9a8afc8d | 1592 | { |
9a8afc8d | 1593 | struct per_cpu_dm_data *data; |
9b63f57d IS |
1594 | |
1595 | data = &per_cpu(dm_cpu_data, cpu); | |
1596 | __net_dm_cpu_data_init(data); | |
1597 | } | |
1598 | ||
1599 | static void net_dm_cpu_data_fini(int cpu) | |
1600 | { | |
1601 | struct per_cpu_dm_data *data; | |
1602 | ||
1603 | data = &per_cpu(dm_cpu_data, cpu); | |
1604 | /* At this point, we should have exclusive access | |
1605 | * to this struct and can free the skb inside it. | |
1606 | */ | |
1607 | consume_skb(data->skb); | |
1608 | __net_dm_cpu_data_fini(data); | |
1609 | } | |
1610 | ||
cac1174f IS |
1611 | static void net_dm_hw_cpu_data_init(int cpu) |
1612 | { | |
1613 | struct per_cpu_dm_data *hw_data; | |
1614 | ||
1615 | hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1616 | __net_dm_cpu_data_init(hw_data); | |
1617 | } | |
1618 | ||
1619 | static void net_dm_hw_cpu_data_fini(int cpu) | |
1620 | { | |
1621 | struct per_cpu_dm_data *hw_data; | |
1622 | ||
1623 | hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
d40e1deb | 1624 | kfree(hw_data->hw_entries); |
cac1174f IS |
1625 | __net_dm_cpu_data_fini(hw_data); |
1626 | } | |
1627 | ||
9b63f57d IS |
1628 | static int __init init_net_drop_monitor(void) |
1629 | { | |
a256be70 CG |
1630 | int cpu, rc; |
1631 | ||
e005d193 | 1632 | pr_info("Initializing network drop monitor service\n"); |
9a8afc8d NH |
1633 | |
1634 | if (sizeof(void *) > 8) { | |
e005d193 | 1635 | pr_err("Unable to store program counters on this arch, Drop monitor failed\n"); |
9a8afc8d NH |
1636 | return -ENOSPC; |
1637 | } | |
1638 | ||
489111e5 | 1639 | rc = genl_register_family(&net_drop_monitor_family); |
a256be70 | 1640 | if (rc) { |
e005d193 | 1641 | pr_err("Could not create drop monitor netlink family\n"); |
a256be70 | 1642 | return rc; |
9a8afc8d | 1643 | } |
2a94fe48 | 1644 | WARN_ON(net_drop_monitor_family.mcgrp_offset != NET_DM_GRP_ALERT); |
e5dcecba | 1645 | |
4ea7e386 NH |
1646 | rc = register_netdevice_notifier(&dropmon_net_notifier); |
1647 | if (rc < 0) { | |
e005d193 | 1648 | pr_crit("Failed to register netdevice notifier\n"); |
4ea7e386 NH |
1649 | goto out_unreg; |
1650 | } | |
1651 | ||
9a8afc8d NH |
1652 | rc = 0; |
1653 | ||
cac1174f | 1654 | for_each_possible_cpu(cpu) { |
9b63f57d | 1655 | net_dm_cpu_data_init(cpu); |
cac1174f IS |
1656 | net_dm_hw_cpu_data_init(cpu); |
1657 | } | |
4ea7e386 | 1658 | |
9a8afc8d NH |
1659 | goto out; |
1660 | ||
1661 | out_unreg: | |
1662 | genl_unregister_family(&net_drop_monitor_family); | |
1663 | out: | |
1664 | return rc; | |
1665 | } | |
1666 | ||
cad456d5 NH |
1667 | static void exit_net_drop_monitor(void) |
1668 | { | |
cad456d5 NH |
1669 | int cpu; |
1670 | ||
1671 | BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier)); | |
1672 | ||
1673 | /* | |
1674 | * Because of the module_get/put we do in the trace state change path | |
1675 | * we are guarnateed not to have any current users when we get here | |
cad456d5 NH |
1676 | */ |
1677 | ||
cac1174f IS |
1678 | for_each_possible_cpu(cpu) { |
1679 | net_dm_hw_cpu_data_fini(cpu); | |
9b63f57d | 1680 | net_dm_cpu_data_fini(cpu); |
cac1174f | 1681 | } |
cad456d5 NH |
1682 | |
1683 | BUG_ON(genl_unregister_family(&net_drop_monitor_family)); | |
1684 | } | |
1685 | ||
1686 | module_init(init_net_drop_monitor); | |
1687 | module_exit(exit_net_drop_monitor); | |
1688 | ||
1689 | MODULE_LICENSE("GPL v2"); | |
1690 | MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>"); | |
3fdcbd45 | 1691 | MODULE_ALIAS_GENL_FAMILY("NET_DM"); |