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Commit | Line | Data |
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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> |
742b8cce | 32 | #include <net/flow_offload.h> |
9a8afc8d | 33 | |
ad8d75ff | 34 | #include <trace/events/skb.h> |
9cbc1cb8 | 35 | #include <trace/events/napi.h> |
9a8afc8d NH |
36 | |
37 | #include <asm/unaligned.h> | |
38 | ||
39 | #define TRACE_ON 1 | |
40 | #define TRACE_OFF 0 | |
41 | ||
9a8afc8d NH |
42 | /* |
43 | * Globals, our netlink socket pointer | |
44 | * and the work handle that will send up | |
45 | * netlink alerts | |
46 | */ | |
4ea7e386 | 47 | static int trace_state = TRACE_OFF; |
edd3d007 | 48 | static bool monitor_hw; |
dbf896b7 IS |
49 | |
50 | /* net_dm_mutex | |
51 | * | |
52 | * An overall lock guarding every operation coming from userspace. | |
53 | * It also guards the global 'hw_stats_list' list. | |
54 | */ | |
55 | static DEFINE_MUTEX(net_dm_mutex); | |
9a8afc8d | 56 | |
e9feb580 IS |
57 | struct net_dm_stats { |
58 | u64 dropped; | |
59 | struct u64_stats_sync syncp; | |
60 | }; | |
61 | ||
d40e1deb IS |
62 | #define NET_DM_MAX_HW_TRAP_NAME_LEN 40 |
63 | ||
64 | struct net_dm_hw_entry { | |
65 | char trap_name[NET_DM_MAX_HW_TRAP_NAME_LEN]; | |
66 | u32 count; | |
67 | }; | |
68 | ||
69 | struct net_dm_hw_entries { | |
70 | u32 num_entries; | |
d2afb41a | 71 | struct net_dm_hw_entry entries[]; |
d40e1deb IS |
72 | }; |
73 | ||
9a8afc8d | 74 | struct per_cpu_dm_data { |
d40e1deb IS |
75 | spinlock_t lock; /* Protects 'skb', 'hw_entries' and |
76 | * 'send_timer' | |
77 | */ | |
78 | union { | |
79 | struct sk_buff *skb; | |
80 | struct net_dm_hw_entries *hw_entries; | |
81 | }; | |
ca30707d | 82 | struct sk_buff_head drop_queue; |
bec4596b ED |
83 | struct work_struct dm_alert_work; |
84 | struct timer_list send_timer; | |
e9feb580 | 85 | struct net_dm_stats stats; |
9a8afc8d NH |
86 | }; |
87 | ||
4ea7e386 NH |
88 | struct dm_hw_stat_delta { |
89 | struct net_device *dev; | |
5848cc09 | 90 | unsigned long last_rx; |
4ea7e386 NH |
91 | struct list_head list; |
92 | struct rcu_head rcu; | |
93 | unsigned long last_drop_val; | |
94 | }; | |
95 | ||
489111e5 | 96 | static struct genl_family net_drop_monitor_family; |
9a8afc8d NH |
97 | |
98 | static DEFINE_PER_CPU(struct per_cpu_dm_data, dm_cpu_data); | |
cac1174f | 99 | static DEFINE_PER_CPU(struct per_cpu_dm_data, dm_hw_cpu_data); |
9a8afc8d NH |
100 | |
101 | static int dm_hit_limit = 64; | |
102 | static int dm_delay = 1; | |
4ea7e386 NH |
103 | static unsigned long dm_hw_check_delta = 2*HZ; |
104 | static LIST_HEAD(hw_stats_list); | |
9a8afc8d | 105 | |
28315f79 | 106 | static enum net_dm_alert_mode net_dm_alert_mode = NET_DM_ALERT_MODE_SUMMARY; |
57986617 | 107 | static u32 net_dm_trunc_len; |
30328d46 | 108 | static u32 net_dm_queue_len = 1000; |
28315f79 IS |
109 | |
110 | struct net_dm_alert_ops { | |
111 | void (*kfree_skb_probe)(void *ignore, struct sk_buff *skb, | |
112 | void *location); | |
113 | void (*napi_poll_probe)(void *ignore, struct napi_struct *napi, | |
114 | int work, int budget); | |
115 | void (*work_item_func)(struct work_struct *work); | |
5e58109b | 116 | void (*hw_work_item_func)(struct work_struct *work); |
edd3d007 IS |
117 | void (*hw_probe)(struct sk_buff *skb, |
118 | const struct net_dm_hw_metadata *hw_metadata); | |
28315f79 IS |
119 | }; |
120 | ||
ca30707d | 121 | struct net_dm_skb_cb { |
5e58109b IS |
122 | union { |
123 | struct net_dm_hw_metadata *hw_metadata; | |
124 | void *pc; | |
125 | }; | |
ca30707d IS |
126 | }; |
127 | ||
128 | #define NET_DM_SKB_CB(__skb) ((struct net_dm_skb_cb *)&((__skb)->cb[0])) | |
129 | ||
bec4596b | 130 | static struct sk_buff *reset_per_cpu_data(struct per_cpu_dm_data *data) |
9a8afc8d NH |
131 | { |
132 | size_t al; | |
133 | struct net_dm_alert_msg *msg; | |
683703a2 | 134 | struct nlattr *nla; |
3885ca78 | 135 | struct sk_buff *skb; |
bec4596b | 136 | unsigned long flags; |
4200462d | 137 | void *msg_header; |
9a8afc8d NH |
138 | |
139 | al = sizeof(struct net_dm_alert_msg); | |
140 | al += dm_hit_limit * sizeof(struct net_dm_drop_point); | |
683703a2 NH |
141 | al += sizeof(struct nlattr); |
142 | ||
3885ca78 NH |
143 | skb = genlmsg_new(al, GFP_KERNEL); |
144 | ||
4200462d RW |
145 | if (!skb) |
146 | goto err; | |
3885ca78 | 147 | |
4200462d RW |
148 | msg_header = genlmsg_put(skb, 0, 0, &net_drop_monitor_family, |
149 | 0, NET_DM_CMD_ALERT); | |
150 | if (!msg_header) { | |
151 | nlmsg_free(skb); | |
152 | skb = NULL; | |
153 | goto err; | |
154 | } | |
155 | nla = nla_reserve(skb, NLA_UNSPEC, | |
156 | sizeof(struct net_dm_alert_msg)); | |
157 | if (!nla) { | |
158 | nlmsg_free(skb); | |
159 | skb = NULL; | |
160 | goto err; | |
161 | } | |
162 | msg = nla_data(nla); | |
163 | memset(msg, 0, al); | |
4200462d RW |
164 | goto out; |
165 | ||
166 | err: | |
167 | mod_timer(&data->send_timer, jiffies + HZ / 10); | |
168 | out: | |
bec4596b ED |
169 | spin_lock_irqsave(&data->lock, flags); |
170 | swap(data->skb, skb); | |
171 | spin_unlock_irqrestore(&data->lock, flags); | |
172 | ||
3b48ab22 RW |
173 | if (skb) { |
174 | struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data; | |
175 | struct genlmsghdr *gnlh = (struct genlmsghdr *)nlmsg_data(nlh); | |
176 | ||
177 | genlmsg_end(skb, genlmsg_data(gnlh)); | |
178 | } | |
179 | ||
bec4596b | 180 | return skb; |
9a8afc8d NH |
181 | } |
182 | ||
85bae4bd | 183 | static const struct genl_multicast_group dropmon_mcgrps[] = { |
2a94fe48 | 184 | { .name = "events", }, |
e5dcecba JB |
185 | }; |
186 | ||
bec4596b | 187 | static void send_dm_alert(struct work_struct *work) |
9a8afc8d NH |
188 | { |
189 | struct sk_buff *skb; | |
bec4596b | 190 | struct per_cpu_dm_data *data; |
9a8afc8d | 191 | |
bec4596b | 192 | data = container_of(work, struct per_cpu_dm_data, dm_alert_work); |
4fdcfa12 | 193 | |
bec4596b | 194 | skb = reset_per_cpu_data(data); |
9a8afc8d | 195 | |
3885ca78 | 196 | if (skb) |
68eb5503 | 197 | genlmsg_multicast(&net_drop_monitor_family, skb, 0, |
2a94fe48 | 198 | 0, GFP_KERNEL); |
9a8afc8d NH |
199 | } |
200 | ||
201 | /* | |
202 | * This is the timer function to delay the sending of an alert | |
203 | * in the event that more drops will arrive during the | |
bec4596b | 204 | * hysteresis period. |
9a8afc8d | 205 | */ |
e99e88a9 | 206 | static void sched_send_work(struct timer_list *t) |
9a8afc8d | 207 | { |
e99e88a9 | 208 | struct per_cpu_dm_data *data = from_timer(data, t, send_timer); |
3885ca78 | 209 | |
bec4596b | 210 | schedule_work(&data->dm_alert_work); |
9a8afc8d NH |
211 | } |
212 | ||
4ea7e386 | 213 | static void trace_drop_common(struct sk_buff *skb, void *location) |
9a8afc8d NH |
214 | { |
215 | struct net_dm_alert_msg *msg; | |
dc30b405 | 216 | struct net_dm_drop_point *point; |
9a8afc8d | 217 | struct nlmsghdr *nlh; |
683703a2 | 218 | struct nlattr *nla; |
9a8afc8d | 219 | int i; |
3885ca78 | 220 | struct sk_buff *dskb; |
bec4596b ED |
221 | struct per_cpu_dm_data *data; |
222 | unsigned long flags; | |
9a8afc8d | 223 | |
bec4596b | 224 | local_irq_save(flags); |
903ceff7 | 225 | data = this_cpu_ptr(&dm_cpu_data); |
bec4596b ED |
226 | spin_lock(&data->lock); |
227 | dskb = data->skb; | |
3885ca78 NH |
228 | |
229 | if (!dskb) | |
230 | goto out; | |
231 | ||
3885ca78 | 232 | nlh = (struct nlmsghdr *)dskb->data; |
683703a2 NH |
233 | nla = genlmsg_data(nlmsg_data(nlh)); |
234 | msg = nla_data(nla); | |
dc30b405 | 235 | point = msg->points; |
9a8afc8d | 236 | for (i = 0; i < msg->entries; i++) { |
dc30b405 AB |
237 | if (!memcmp(&location, &point->pc, sizeof(void *))) { |
238 | point->count++; | |
9a8afc8d NH |
239 | goto out; |
240 | } | |
dc30b405 | 241 | point++; |
9a8afc8d | 242 | } |
bec4596b ED |
243 | if (msg->entries == dm_hit_limit) |
244 | goto out; | |
9a8afc8d NH |
245 | /* |
246 | * We need to create a new entry | |
247 | */ | |
3885ca78 | 248 | __nla_reserve_nohdr(dskb, sizeof(struct net_dm_drop_point)); |
683703a2 | 249 | nla->nla_len += NLA_ALIGN(sizeof(struct net_dm_drop_point)); |
dc30b405 AB |
250 | memcpy(point->pc, &location, sizeof(void *)); |
251 | point->count = 1; | |
9a8afc8d NH |
252 | msg->entries++; |
253 | ||
254 | if (!timer_pending(&data->send_timer)) { | |
255 | data->send_timer.expires = jiffies + dm_delay * HZ; | |
bec4596b | 256 | add_timer(&data->send_timer); |
9a8afc8d NH |
257 | } |
258 | ||
259 | out: | |
bec4596b | 260 | spin_unlock_irqrestore(&data->lock, flags); |
9a8afc8d NH |
261 | } |
262 | ||
38516ab5 | 263 | static void trace_kfree_skb_hit(void *ignore, struct sk_buff *skb, void *location) |
4ea7e386 NH |
264 | { |
265 | trace_drop_common(skb, location); | |
266 | } | |
267 | ||
1db19db7 JDB |
268 | static void trace_napi_poll_hit(void *ignore, struct napi_struct *napi, |
269 | int work, int budget) | |
4ea7e386 NH |
270 | { |
271 | struct dm_hw_stat_delta *new_stat; | |
272 | ||
273 | /* | |
5848cc09 | 274 | * Don't check napi structures with no associated device |
4ea7e386 | 275 | */ |
5848cc09 | 276 | if (!napi->dev) |
4ea7e386 NH |
277 | return; |
278 | ||
279 | rcu_read_lock(); | |
280 | list_for_each_entry_rcu(new_stat, &hw_stats_list, list) { | |
5848cc09 NH |
281 | /* |
282 | * only add a note to our monitor buffer if: | |
283 | * 1) this is the dev we received on | |
284 | * 2) its after the last_rx delta | |
285 | * 3) our rx_dropped count has gone up | |
286 | */ | |
4ea7e386 | 287 | if ((new_stat->dev == napi->dev) && |
5848cc09 | 288 | (time_after(jiffies, new_stat->last_rx + dm_hw_check_delta)) && |
4ea7e386 NH |
289 | (napi->dev->stats.rx_dropped != new_stat->last_drop_val)) { |
290 | trace_drop_common(NULL, NULL); | |
291 | new_stat->last_drop_val = napi->dev->stats.rx_dropped; | |
5848cc09 | 292 | new_stat->last_rx = jiffies; |
4ea7e386 NH |
293 | break; |
294 | } | |
295 | } | |
296 | rcu_read_unlock(); | |
297 | } | |
298 | ||
d40e1deb IS |
299 | static struct net_dm_hw_entries * |
300 | net_dm_hw_reset_per_cpu_data(struct per_cpu_dm_data *hw_data) | |
301 | { | |
302 | struct net_dm_hw_entries *hw_entries; | |
303 | unsigned long flags; | |
304 | ||
305 | hw_entries = kzalloc(struct_size(hw_entries, entries, dm_hit_limit), | |
306 | GFP_KERNEL); | |
307 | if (!hw_entries) { | |
308 | /* If the memory allocation failed, we try to perform another | |
309 | * allocation in 1/10 second. Otherwise, the probe function | |
310 | * will constantly bail out. | |
311 | */ | |
312 | mod_timer(&hw_data->send_timer, jiffies + HZ / 10); | |
313 | } | |
314 | ||
315 | spin_lock_irqsave(&hw_data->lock, flags); | |
316 | swap(hw_data->hw_entries, hw_entries); | |
317 | spin_unlock_irqrestore(&hw_data->lock, flags); | |
318 | ||
319 | return hw_entries; | |
320 | } | |
321 | ||
322 | static int net_dm_hw_entry_put(struct sk_buff *msg, | |
323 | const struct net_dm_hw_entry *hw_entry) | |
324 | { | |
325 | struct nlattr *attr; | |
326 | ||
327 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_ENTRY); | |
328 | if (!attr) | |
329 | return -EMSGSIZE; | |
330 | ||
331 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_NAME, hw_entry->trap_name)) | |
332 | goto nla_put_failure; | |
333 | ||
334 | if (nla_put_u32(msg, NET_DM_ATTR_HW_TRAP_COUNT, hw_entry->count)) | |
335 | goto nla_put_failure; | |
336 | ||
337 | nla_nest_end(msg, attr); | |
338 | ||
339 | return 0; | |
340 | ||
341 | nla_put_failure: | |
342 | nla_nest_cancel(msg, attr); | |
343 | return -EMSGSIZE; | |
344 | } | |
345 | ||
346 | static int net_dm_hw_entries_put(struct sk_buff *msg, | |
347 | const struct net_dm_hw_entries *hw_entries) | |
348 | { | |
349 | struct nlattr *attr; | |
350 | int i; | |
351 | ||
352 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_ENTRIES); | |
353 | if (!attr) | |
354 | return -EMSGSIZE; | |
355 | ||
356 | for (i = 0; i < hw_entries->num_entries; i++) { | |
357 | int rc; | |
358 | ||
359 | rc = net_dm_hw_entry_put(msg, &hw_entries->entries[i]); | |
360 | if (rc) | |
361 | goto nla_put_failure; | |
362 | } | |
363 | ||
364 | nla_nest_end(msg, attr); | |
365 | ||
366 | return 0; | |
367 | ||
368 | nla_put_failure: | |
369 | nla_nest_cancel(msg, attr); | |
370 | return -EMSGSIZE; | |
371 | } | |
372 | ||
373 | static int | |
374 | net_dm_hw_summary_report_fill(struct sk_buff *msg, | |
375 | const struct net_dm_hw_entries *hw_entries) | |
376 | { | |
377 | struct net_dm_alert_msg anc_hdr = { 0 }; | |
378 | void *hdr; | |
379 | int rc; | |
380 | ||
381 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
382 | NET_DM_CMD_ALERT); | |
383 | if (!hdr) | |
384 | return -EMSGSIZE; | |
385 | ||
386 | /* We need to put the ancillary header in order not to break user | |
387 | * space. | |
388 | */ | |
389 | if (nla_put(msg, NLA_UNSPEC, sizeof(anc_hdr), &anc_hdr)) | |
390 | goto nla_put_failure; | |
391 | ||
392 | rc = net_dm_hw_entries_put(msg, hw_entries); | |
393 | if (rc) | |
394 | goto nla_put_failure; | |
395 | ||
396 | genlmsg_end(msg, hdr); | |
397 | ||
398 | return 0; | |
399 | ||
400 | nla_put_failure: | |
401 | genlmsg_cancel(msg, hdr); | |
402 | return -EMSGSIZE; | |
403 | } | |
404 | ||
405 | static void net_dm_hw_summary_work(struct work_struct *work) | |
406 | { | |
407 | struct net_dm_hw_entries *hw_entries; | |
408 | struct per_cpu_dm_data *hw_data; | |
409 | struct sk_buff *msg; | |
410 | int rc; | |
411 | ||
412 | hw_data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
413 | ||
414 | hw_entries = net_dm_hw_reset_per_cpu_data(hw_data); | |
415 | if (!hw_entries) | |
416 | return; | |
417 | ||
418 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
419 | if (!msg) | |
420 | goto out; | |
421 | ||
422 | rc = net_dm_hw_summary_report_fill(msg, hw_entries); | |
423 | if (rc) { | |
424 | nlmsg_free(msg); | |
425 | goto out; | |
426 | } | |
427 | ||
428 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
429 | ||
430 | out: | |
431 | kfree(hw_entries); | |
432 | } | |
433 | ||
edd3d007 IS |
434 | static void |
435 | net_dm_hw_summary_probe(struct sk_buff *skb, | |
436 | const struct net_dm_hw_metadata *hw_metadata) | |
437 | { | |
d40e1deb IS |
438 | struct net_dm_hw_entries *hw_entries; |
439 | struct net_dm_hw_entry *hw_entry; | |
440 | struct per_cpu_dm_data *hw_data; | |
441 | unsigned long flags; | |
442 | int i; | |
443 | ||
444 | hw_data = this_cpu_ptr(&dm_hw_cpu_data); | |
445 | spin_lock_irqsave(&hw_data->lock, flags); | |
446 | hw_entries = hw_data->hw_entries; | |
447 | ||
448 | if (!hw_entries) | |
449 | goto out; | |
450 | ||
451 | for (i = 0; i < hw_entries->num_entries; i++) { | |
452 | hw_entry = &hw_entries->entries[i]; | |
453 | if (!strncmp(hw_entry->trap_name, hw_metadata->trap_name, | |
454 | NET_DM_MAX_HW_TRAP_NAME_LEN - 1)) { | |
455 | hw_entry->count++; | |
456 | goto out; | |
457 | } | |
458 | } | |
459 | if (WARN_ON_ONCE(hw_entries->num_entries == dm_hit_limit)) | |
460 | goto out; | |
461 | ||
462 | hw_entry = &hw_entries->entries[hw_entries->num_entries]; | |
463 | strlcpy(hw_entry->trap_name, hw_metadata->trap_name, | |
464 | NET_DM_MAX_HW_TRAP_NAME_LEN - 1); | |
465 | hw_entry->count = 1; | |
466 | hw_entries->num_entries++; | |
467 | ||
468 | if (!timer_pending(&hw_data->send_timer)) { | |
469 | hw_data->send_timer.expires = jiffies + dm_delay * HZ; | |
470 | add_timer(&hw_data->send_timer); | |
471 | } | |
472 | ||
473 | out: | |
474 | spin_unlock_irqrestore(&hw_data->lock, flags); | |
edd3d007 IS |
475 | } |
476 | ||
28315f79 IS |
477 | static const struct net_dm_alert_ops net_dm_alert_summary_ops = { |
478 | .kfree_skb_probe = trace_kfree_skb_hit, | |
479 | .napi_poll_probe = trace_napi_poll_hit, | |
480 | .work_item_func = send_dm_alert, | |
d40e1deb | 481 | .hw_work_item_func = net_dm_hw_summary_work, |
edd3d007 | 482 | .hw_probe = net_dm_hw_summary_probe, |
28315f79 IS |
483 | }; |
484 | ||
ca30707d IS |
485 | static void net_dm_packet_trace_kfree_skb_hit(void *ignore, |
486 | struct sk_buff *skb, | |
487 | void *location) | |
488 | { | |
489 | ktime_t tstamp = ktime_get_real(); | |
490 | struct per_cpu_dm_data *data; | |
491 | struct sk_buff *nskb; | |
492 | unsigned long flags; | |
493 | ||
bef17466 IS |
494 | if (!skb_mac_header_was_set(skb)) |
495 | return; | |
496 | ||
ca30707d IS |
497 | nskb = skb_clone(skb, GFP_ATOMIC); |
498 | if (!nskb) | |
499 | return; | |
500 | ||
501 | NET_DM_SKB_CB(nskb)->pc = location; | |
502 | /* Override the timestamp because we care about the time when the | |
503 | * packet was dropped. | |
504 | */ | |
505 | nskb->tstamp = tstamp; | |
506 | ||
507 | data = this_cpu_ptr(&dm_cpu_data); | |
508 | ||
509 | spin_lock_irqsave(&data->drop_queue.lock, flags); | |
30328d46 | 510 | if (skb_queue_len(&data->drop_queue) < net_dm_queue_len) |
ca30707d IS |
511 | __skb_queue_tail(&data->drop_queue, nskb); |
512 | else | |
513 | goto unlock_free; | |
514 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
515 | ||
516 | schedule_work(&data->dm_alert_work); | |
517 | ||
518 | return; | |
519 | ||
520 | unlock_free: | |
521 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
e9feb580 IS |
522 | u64_stats_update_begin(&data->stats.syncp); |
523 | data->stats.dropped++; | |
524 | u64_stats_update_end(&data->stats.syncp); | |
ca30707d IS |
525 | consume_skb(nskb); |
526 | } | |
527 | ||
528 | static void net_dm_packet_trace_napi_poll_hit(void *ignore, | |
529 | struct napi_struct *napi, | |
530 | int work, int budget) | |
531 | { | |
532 | } | |
533 | ||
534 | static size_t net_dm_in_port_size(void) | |
535 | { | |
536 | /* NET_DM_ATTR_IN_PORT nest */ | |
537 | return nla_total_size(0) + | |
538 | /* NET_DM_ATTR_PORT_NETDEV_IFINDEX */ | |
5e58109b IS |
539 | nla_total_size(sizeof(u32)) + |
540 | /* NET_DM_ATTR_PORT_NETDEV_NAME */ | |
541 | nla_total_size(IFNAMSIZ + 1); | |
ca30707d IS |
542 | } |
543 | ||
544 | #define NET_DM_MAX_SYMBOL_LEN 40 | |
545 | ||
546 | static size_t net_dm_packet_report_size(size_t payload_len) | |
547 | { | |
548 | size_t size; | |
549 | ||
550 | size = nlmsg_msg_size(GENL_HDRLEN + net_drop_monitor_family.hdrsize); | |
551 | ||
552 | return NLMSG_ALIGN(size) + | |
5e58109b IS |
553 | /* NET_DM_ATTR_ORIGIN */ |
554 | nla_total_size(sizeof(u16)) + | |
ca30707d IS |
555 | /* NET_DM_ATTR_PC */ |
556 | nla_total_size(sizeof(u64)) + | |
557 | /* NET_DM_ATTR_SYMBOL */ | |
558 | nla_total_size(NET_DM_MAX_SYMBOL_LEN + 1) + | |
559 | /* NET_DM_ATTR_IN_PORT */ | |
560 | net_dm_in_port_size() + | |
561 | /* NET_DM_ATTR_TIMESTAMP */ | |
bd1200b7 | 562 | nla_total_size(sizeof(u64)) + |
57986617 IS |
563 | /* NET_DM_ATTR_ORIG_LEN */ |
564 | nla_total_size(sizeof(u32)) + | |
ca30707d IS |
565 | /* NET_DM_ATTR_PROTO */ |
566 | nla_total_size(sizeof(u16)) + | |
567 | /* NET_DM_ATTR_PAYLOAD */ | |
568 | nla_total_size(payload_len); | |
569 | } | |
570 | ||
5e58109b IS |
571 | static int net_dm_packet_report_in_port_put(struct sk_buff *msg, int ifindex, |
572 | const char *name) | |
ca30707d IS |
573 | { |
574 | struct nlattr *attr; | |
575 | ||
576 | attr = nla_nest_start(msg, NET_DM_ATTR_IN_PORT); | |
577 | if (!attr) | |
578 | return -EMSGSIZE; | |
579 | ||
580 | if (ifindex && | |
581 | nla_put_u32(msg, NET_DM_ATTR_PORT_NETDEV_IFINDEX, ifindex)) | |
582 | goto nla_put_failure; | |
583 | ||
5e58109b IS |
584 | if (name && nla_put_string(msg, NET_DM_ATTR_PORT_NETDEV_NAME, name)) |
585 | goto nla_put_failure; | |
586 | ||
ca30707d IS |
587 | nla_nest_end(msg, attr); |
588 | ||
589 | return 0; | |
590 | ||
591 | nla_put_failure: | |
592 | nla_nest_cancel(msg, attr); | |
593 | return -EMSGSIZE; | |
594 | } | |
595 | ||
596 | static int net_dm_packet_report_fill(struct sk_buff *msg, struct sk_buff *skb, | |
597 | size_t payload_len) | |
598 | { | |
599 | u64 pc = (u64)(uintptr_t) NET_DM_SKB_CB(skb)->pc; | |
600 | char buf[NET_DM_MAX_SYMBOL_LEN]; | |
601 | struct nlattr *attr; | |
ca30707d IS |
602 | void *hdr; |
603 | int rc; | |
604 | ||
605 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
606 | NET_DM_CMD_PACKET_ALERT); | |
607 | if (!hdr) | |
608 | return -EMSGSIZE; | |
609 | ||
5e58109b IS |
610 | if (nla_put_u16(msg, NET_DM_ATTR_ORIGIN, NET_DM_ORIGIN_SW)) |
611 | goto nla_put_failure; | |
612 | ||
ca30707d IS |
613 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_PC, pc, NET_DM_ATTR_PAD)) |
614 | goto nla_put_failure; | |
615 | ||
616 | snprintf(buf, sizeof(buf), "%pS", NET_DM_SKB_CB(skb)->pc); | |
617 | if (nla_put_string(msg, NET_DM_ATTR_SYMBOL, buf)) | |
618 | goto nla_put_failure; | |
619 | ||
5e58109b | 620 | rc = net_dm_packet_report_in_port_put(msg, skb->skb_iif, NULL); |
ca30707d IS |
621 | if (rc) |
622 | goto nla_put_failure; | |
623 | ||
bd1200b7 IS |
624 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_TIMESTAMP, |
625 | ktime_to_ns(skb->tstamp), NET_DM_ATTR_PAD)) | |
ca30707d IS |
626 | goto nla_put_failure; |
627 | ||
57986617 IS |
628 | if (nla_put_u32(msg, NET_DM_ATTR_ORIG_LEN, skb->len)) |
629 | goto nla_put_failure; | |
630 | ||
ca30707d IS |
631 | if (!payload_len) |
632 | goto out; | |
633 | ||
634 | if (nla_put_u16(msg, NET_DM_ATTR_PROTO, be16_to_cpu(skb->protocol))) | |
635 | goto nla_put_failure; | |
636 | ||
637 | attr = skb_put(msg, nla_total_size(payload_len)); | |
638 | attr->nla_type = NET_DM_ATTR_PAYLOAD; | |
639 | attr->nla_len = nla_attr_size(payload_len); | |
640 | if (skb_copy_bits(skb, 0, nla_data(attr), payload_len)) | |
641 | goto nla_put_failure; | |
642 | ||
643 | out: | |
644 | genlmsg_end(msg, hdr); | |
645 | ||
646 | return 0; | |
647 | ||
648 | nla_put_failure: | |
649 | genlmsg_cancel(msg, hdr); | |
650 | return -EMSGSIZE; | |
651 | } | |
652 | ||
653 | #define NET_DM_MAX_PACKET_SIZE (0xffff - NLA_HDRLEN - NLA_ALIGNTO) | |
654 | ||
655 | static void net_dm_packet_report(struct sk_buff *skb) | |
656 | { | |
657 | struct sk_buff *msg; | |
658 | size_t payload_len; | |
659 | int rc; | |
660 | ||
661 | /* Make sure we start copying the packet from the MAC header */ | |
662 | if (skb->data > skb_mac_header(skb)) | |
663 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
664 | else | |
665 | skb_pull(skb, skb_mac_header(skb) - skb->data); | |
666 | ||
667 | /* Ensure packet fits inside a single netlink attribute */ | |
668 | payload_len = min_t(size_t, skb->len, NET_DM_MAX_PACKET_SIZE); | |
57986617 IS |
669 | if (net_dm_trunc_len) |
670 | payload_len = min_t(size_t, net_dm_trunc_len, payload_len); | |
ca30707d IS |
671 | |
672 | msg = nlmsg_new(net_dm_packet_report_size(payload_len), GFP_KERNEL); | |
673 | if (!msg) | |
674 | goto out; | |
675 | ||
676 | rc = net_dm_packet_report_fill(msg, skb, payload_len); | |
677 | if (rc) { | |
678 | nlmsg_free(msg); | |
679 | goto out; | |
680 | } | |
681 | ||
682 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
683 | ||
684 | out: | |
685 | consume_skb(skb); | |
686 | } | |
687 | ||
688 | static void net_dm_packet_work(struct work_struct *work) | |
689 | { | |
690 | struct per_cpu_dm_data *data; | |
691 | struct sk_buff_head list; | |
692 | struct sk_buff *skb; | |
693 | unsigned long flags; | |
694 | ||
695 | data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
696 | ||
697 | __skb_queue_head_init(&list); | |
698 | ||
699 | spin_lock_irqsave(&data->drop_queue.lock, flags); | |
700 | skb_queue_splice_tail_init(&data->drop_queue, &list); | |
701 | spin_unlock_irqrestore(&data->drop_queue.lock, flags); | |
702 | ||
703 | while ((skb = __skb_dequeue(&list))) | |
704 | net_dm_packet_report(skb); | |
705 | } | |
706 | ||
742b8cce JP |
707 | static size_t |
708 | net_dm_flow_action_cookie_size(const struct net_dm_hw_metadata *hw_metadata) | |
709 | { | |
710 | return hw_metadata->fa_cookie ? | |
711 | nla_total_size(hw_metadata->fa_cookie->cookie_len) : 0; | |
712 | } | |
713 | ||
5e58109b IS |
714 | static size_t |
715 | net_dm_hw_packet_report_size(size_t payload_len, | |
716 | const struct net_dm_hw_metadata *hw_metadata) | |
717 | { | |
718 | size_t size; | |
719 | ||
720 | size = nlmsg_msg_size(GENL_HDRLEN + net_drop_monitor_family.hdrsize); | |
721 | ||
722 | return NLMSG_ALIGN(size) + | |
723 | /* NET_DM_ATTR_ORIGIN */ | |
724 | nla_total_size(sizeof(u16)) + | |
725 | /* NET_DM_ATTR_HW_TRAP_GROUP_NAME */ | |
726 | nla_total_size(strlen(hw_metadata->trap_group_name) + 1) + | |
727 | /* NET_DM_ATTR_HW_TRAP_NAME */ | |
728 | nla_total_size(strlen(hw_metadata->trap_name) + 1) + | |
729 | /* NET_DM_ATTR_IN_PORT */ | |
730 | net_dm_in_port_size() + | |
742b8cce JP |
731 | /* NET_DM_ATTR_FLOW_ACTION_COOKIE */ |
732 | net_dm_flow_action_cookie_size(hw_metadata) + | |
5e58109b | 733 | /* NET_DM_ATTR_TIMESTAMP */ |
bd1200b7 | 734 | nla_total_size(sizeof(u64)) + |
5e58109b IS |
735 | /* NET_DM_ATTR_ORIG_LEN */ |
736 | nla_total_size(sizeof(u32)) + | |
737 | /* NET_DM_ATTR_PROTO */ | |
738 | nla_total_size(sizeof(u16)) + | |
739 | /* NET_DM_ATTR_PAYLOAD */ | |
740 | nla_total_size(payload_len); | |
741 | } | |
742 | ||
743 | static int net_dm_hw_packet_report_fill(struct sk_buff *msg, | |
744 | struct sk_buff *skb, size_t payload_len) | |
745 | { | |
746 | struct net_dm_hw_metadata *hw_metadata; | |
747 | struct nlattr *attr; | |
5e58109b IS |
748 | void *hdr; |
749 | ||
750 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
751 | ||
752 | hdr = genlmsg_put(msg, 0, 0, &net_drop_monitor_family, 0, | |
753 | NET_DM_CMD_PACKET_ALERT); | |
754 | if (!hdr) | |
755 | return -EMSGSIZE; | |
756 | ||
757 | if (nla_put_u16(msg, NET_DM_ATTR_ORIGIN, NET_DM_ORIGIN_HW)) | |
758 | goto nla_put_failure; | |
759 | ||
760 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_GROUP_NAME, | |
761 | hw_metadata->trap_group_name)) | |
762 | goto nla_put_failure; | |
763 | ||
764 | if (nla_put_string(msg, NET_DM_ATTR_HW_TRAP_NAME, | |
765 | hw_metadata->trap_name)) | |
766 | goto nla_put_failure; | |
767 | ||
768 | if (hw_metadata->input_dev) { | |
769 | struct net_device *dev = hw_metadata->input_dev; | |
770 | int rc; | |
771 | ||
772 | rc = net_dm_packet_report_in_port_put(msg, dev->ifindex, | |
773 | dev->name); | |
774 | if (rc) | |
775 | goto nla_put_failure; | |
776 | } | |
777 | ||
742b8cce JP |
778 | if (hw_metadata->fa_cookie && |
779 | nla_put(msg, NET_DM_ATTR_FLOW_ACTION_COOKIE, | |
780 | hw_metadata->fa_cookie->cookie_len, | |
781 | hw_metadata->fa_cookie->cookie)) | |
782 | goto nla_put_failure; | |
783 | ||
bd1200b7 IS |
784 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_TIMESTAMP, |
785 | ktime_to_ns(skb->tstamp), NET_DM_ATTR_PAD)) | |
5e58109b IS |
786 | goto nla_put_failure; |
787 | ||
788 | if (nla_put_u32(msg, NET_DM_ATTR_ORIG_LEN, skb->len)) | |
789 | goto nla_put_failure; | |
790 | ||
791 | if (!payload_len) | |
792 | goto out; | |
793 | ||
794 | if (nla_put_u16(msg, NET_DM_ATTR_PROTO, be16_to_cpu(skb->protocol))) | |
795 | goto nla_put_failure; | |
796 | ||
797 | attr = skb_put(msg, nla_total_size(payload_len)); | |
798 | attr->nla_type = NET_DM_ATTR_PAYLOAD; | |
799 | attr->nla_len = nla_attr_size(payload_len); | |
800 | if (skb_copy_bits(skb, 0, nla_data(attr), payload_len)) | |
801 | goto nla_put_failure; | |
802 | ||
803 | out: | |
804 | genlmsg_end(msg, hdr); | |
805 | ||
806 | return 0; | |
807 | ||
808 | nla_put_failure: | |
809 | genlmsg_cancel(msg, hdr); | |
810 | return -EMSGSIZE; | |
811 | } | |
812 | ||
813 | static struct net_dm_hw_metadata * | |
814 | net_dm_hw_metadata_clone(const struct net_dm_hw_metadata *hw_metadata) | |
815 | { | |
742b8cce | 816 | const struct flow_action_cookie *fa_cookie; |
5e58109b IS |
817 | struct net_dm_hw_metadata *n_hw_metadata; |
818 | const char *trap_group_name; | |
819 | const char *trap_name; | |
820 | ||
742b8cce | 821 | n_hw_metadata = kzalloc(sizeof(*hw_metadata), GFP_ATOMIC); |
5e58109b IS |
822 | if (!n_hw_metadata) |
823 | return NULL; | |
824 | ||
72d62c4e | 825 | trap_group_name = kstrdup(hw_metadata->trap_group_name, GFP_ATOMIC); |
5e58109b IS |
826 | if (!trap_group_name) |
827 | goto free_hw_metadata; | |
828 | n_hw_metadata->trap_group_name = trap_group_name; | |
829 | ||
72d62c4e | 830 | trap_name = kstrdup(hw_metadata->trap_name, GFP_ATOMIC); |
5e58109b IS |
831 | if (!trap_name) |
832 | goto free_trap_group; | |
833 | n_hw_metadata->trap_name = trap_name; | |
834 | ||
742b8cce JP |
835 | if (hw_metadata->fa_cookie) { |
836 | size_t cookie_size = sizeof(*fa_cookie) + | |
837 | hw_metadata->fa_cookie->cookie_len; | |
838 | ||
839 | fa_cookie = kmemdup(hw_metadata->fa_cookie, cookie_size, | |
840 | GFP_ATOMIC); | |
841 | if (!fa_cookie) | |
842 | goto free_trap_name; | |
843 | n_hw_metadata->fa_cookie = fa_cookie; | |
844 | } | |
845 | ||
5e58109b IS |
846 | n_hw_metadata->input_dev = hw_metadata->input_dev; |
847 | if (n_hw_metadata->input_dev) | |
848 | dev_hold(n_hw_metadata->input_dev); | |
849 | ||
850 | return n_hw_metadata; | |
851 | ||
742b8cce JP |
852 | free_trap_name: |
853 | kfree(trap_name); | |
5e58109b IS |
854 | free_trap_group: |
855 | kfree(trap_group_name); | |
856 | free_hw_metadata: | |
857 | kfree(n_hw_metadata); | |
858 | return NULL; | |
859 | } | |
860 | ||
861 | static void | |
862 | net_dm_hw_metadata_free(const struct net_dm_hw_metadata *hw_metadata) | |
863 | { | |
864 | if (hw_metadata->input_dev) | |
865 | dev_put(hw_metadata->input_dev); | |
742b8cce | 866 | kfree(hw_metadata->fa_cookie); |
5e58109b IS |
867 | kfree(hw_metadata->trap_name); |
868 | kfree(hw_metadata->trap_group_name); | |
869 | kfree(hw_metadata); | |
870 | } | |
871 | ||
872 | static void net_dm_hw_packet_report(struct sk_buff *skb) | |
873 | { | |
874 | struct net_dm_hw_metadata *hw_metadata; | |
875 | struct sk_buff *msg; | |
876 | size_t payload_len; | |
877 | int rc; | |
878 | ||
879 | if (skb->data > skb_mac_header(skb)) | |
880 | skb_push(skb, skb->data - skb_mac_header(skb)); | |
881 | else | |
882 | skb_pull(skb, skb_mac_header(skb) - skb->data); | |
883 | ||
884 | payload_len = min_t(size_t, skb->len, NET_DM_MAX_PACKET_SIZE); | |
885 | if (net_dm_trunc_len) | |
886 | payload_len = min_t(size_t, net_dm_trunc_len, payload_len); | |
887 | ||
888 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
889 | msg = nlmsg_new(net_dm_hw_packet_report_size(payload_len, hw_metadata), | |
890 | GFP_KERNEL); | |
891 | if (!msg) | |
892 | goto out; | |
893 | ||
894 | rc = net_dm_hw_packet_report_fill(msg, skb, payload_len); | |
895 | if (rc) { | |
896 | nlmsg_free(msg); | |
897 | goto out; | |
898 | } | |
899 | ||
900 | genlmsg_multicast(&net_drop_monitor_family, msg, 0, 0, GFP_KERNEL); | |
901 | ||
902 | out: | |
903 | net_dm_hw_metadata_free(NET_DM_SKB_CB(skb)->hw_metadata); | |
904 | consume_skb(skb); | |
905 | } | |
906 | ||
907 | static void net_dm_hw_packet_work(struct work_struct *work) | |
908 | { | |
909 | struct per_cpu_dm_data *hw_data; | |
910 | struct sk_buff_head list; | |
911 | struct sk_buff *skb; | |
912 | unsigned long flags; | |
913 | ||
914 | hw_data = container_of(work, struct per_cpu_dm_data, dm_alert_work); | |
915 | ||
916 | __skb_queue_head_init(&list); | |
917 | ||
918 | spin_lock_irqsave(&hw_data->drop_queue.lock, flags); | |
919 | skb_queue_splice_tail_init(&hw_data->drop_queue, &list); | |
920 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
921 | ||
922 | while ((skb = __skb_dequeue(&list))) | |
923 | net_dm_hw_packet_report(skb); | |
924 | } | |
925 | ||
edd3d007 IS |
926 | static void |
927 | net_dm_hw_packet_probe(struct sk_buff *skb, | |
928 | const struct net_dm_hw_metadata *hw_metadata) | |
929 | { | |
5e58109b IS |
930 | struct net_dm_hw_metadata *n_hw_metadata; |
931 | ktime_t tstamp = ktime_get_real(); | |
932 | struct per_cpu_dm_data *hw_data; | |
933 | struct sk_buff *nskb; | |
934 | unsigned long flags; | |
935 | ||
bef17466 IS |
936 | if (!skb_mac_header_was_set(skb)) |
937 | return; | |
938 | ||
5e58109b IS |
939 | nskb = skb_clone(skb, GFP_ATOMIC); |
940 | if (!nskb) | |
941 | return; | |
942 | ||
943 | n_hw_metadata = net_dm_hw_metadata_clone(hw_metadata); | |
944 | if (!n_hw_metadata) | |
945 | goto free; | |
946 | ||
947 | NET_DM_SKB_CB(nskb)->hw_metadata = n_hw_metadata; | |
948 | nskb->tstamp = tstamp; | |
949 | ||
950 | hw_data = this_cpu_ptr(&dm_hw_cpu_data); | |
951 | ||
952 | spin_lock_irqsave(&hw_data->drop_queue.lock, flags); | |
953 | if (skb_queue_len(&hw_data->drop_queue) < net_dm_queue_len) | |
954 | __skb_queue_tail(&hw_data->drop_queue, nskb); | |
955 | else | |
956 | goto unlock_free; | |
957 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
958 | ||
959 | schedule_work(&hw_data->dm_alert_work); | |
960 | ||
961 | return; | |
962 | ||
963 | unlock_free: | |
964 | spin_unlock_irqrestore(&hw_data->drop_queue.lock, flags); | |
965 | u64_stats_update_begin(&hw_data->stats.syncp); | |
966 | hw_data->stats.dropped++; | |
967 | u64_stats_update_end(&hw_data->stats.syncp); | |
968 | net_dm_hw_metadata_free(n_hw_metadata); | |
969 | free: | |
970 | consume_skb(nskb); | |
edd3d007 IS |
971 | } |
972 | ||
ca30707d IS |
973 | static const struct net_dm_alert_ops net_dm_alert_packet_ops = { |
974 | .kfree_skb_probe = net_dm_packet_trace_kfree_skb_hit, | |
975 | .napi_poll_probe = net_dm_packet_trace_napi_poll_hit, | |
976 | .work_item_func = net_dm_packet_work, | |
5e58109b | 977 | .hw_work_item_func = net_dm_hw_packet_work, |
edd3d007 | 978 | .hw_probe = net_dm_hw_packet_probe, |
ca30707d IS |
979 | }; |
980 | ||
28315f79 IS |
981 | static const struct net_dm_alert_ops *net_dm_alert_ops_arr[] = { |
982 | [NET_DM_ALERT_MODE_SUMMARY] = &net_dm_alert_summary_ops, | |
ca30707d | 983 | [NET_DM_ALERT_MODE_PACKET] = &net_dm_alert_packet_ops, |
28315f79 IS |
984 | }; |
985 | ||
edd3d007 IS |
986 | void net_dm_hw_report(struct sk_buff *skb, |
987 | const struct net_dm_hw_metadata *hw_metadata) | |
988 | { | |
8e94c3bc IS |
989 | rcu_read_lock(); |
990 | ||
edd3d007 | 991 | if (!monitor_hw) |
8e94c3bc | 992 | goto out; |
edd3d007 IS |
993 | |
994 | net_dm_alert_ops_arr[net_dm_alert_mode]->hw_probe(skb, hw_metadata); | |
8e94c3bc IS |
995 | |
996 | out: | |
997 | rcu_read_unlock(); | |
edd3d007 IS |
998 | } |
999 | EXPORT_SYMBOL_GPL(net_dm_hw_report); | |
1000 | ||
8e94c3bc IS |
1001 | static int net_dm_hw_monitor_start(struct netlink_ext_ack *extack) |
1002 | { | |
1003 | const struct net_dm_alert_ops *ops; | |
1004 | int cpu; | |
1005 | ||
1006 | if (monitor_hw) { | |
1007 | NL_SET_ERR_MSG_MOD(extack, "Hardware monitoring already enabled"); | |
1008 | return -EAGAIN; | |
1009 | } | |
1010 | ||
1011 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; | |
1012 | ||
1013 | if (!try_module_get(THIS_MODULE)) { | |
1014 | NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module"); | |
1015 | return -ENODEV; | |
1016 | } | |
1017 | ||
1018 | for_each_possible_cpu(cpu) { | |
1019 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1020 | struct net_dm_hw_entries *hw_entries; | |
1021 | ||
1022 | INIT_WORK(&hw_data->dm_alert_work, ops->hw_work_item_func); | |
1023 | timer_setup(&hw_data->send_timer, sched_send_work, 0); | |
1024 | hw_entries = net_dm_hw_reset_per_cpu_data(hw_data); | |
1025 | kfree(hw_entries); | |
1026 | } | |
1027 | ||
1028 | monitor_hw = true; | |
1029 | ||
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static void net_dm_hw_monitor_stop(struct netlink_ext_ack *extack) | |
1034 | { | |
1035 | int cpu; | |
1036 | ||
dfa7f709 | 1037 | if (!monitor_hw) { |
8e94c3bc | 1038 | NL_SET_ERR_MSG_MOD(extack, "Hardware monitoring already disabled"); |
dfa7f709 IS |
1039 | return; |
1040 | } | |
8e94c3bc IS |
1041 | |
1042 | monitor_hw = false; | |
1043 | ||
1044 | /* After this call returns we are guaranteed that no CPU is processing | |
1045 | * any hardware drops. | |
1046 | */ | |
1047 | synchronize_rcu(); | |
1048 | ||
1049 | for_each_possible_cpu(cpu) { | |
1050 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1051 | struct sk_buff *skb; | |
1052 | ||
1053 | del_timer_sync(&hw_data->send_timer); | |
1054 | cancel_work_sync(&hw_data->dm_alert_work); | |
1055 | while ((skb = __skb_dequeue(&hw_data->drop_queue))) { | |
1056 | struct net_dm_hw_metadata *hw_metadata; | |
1057 | ||
1058 | hw_metadata = NET_DM_SKB_CB(skb)->hw_metadata; | |
1059 | net_dm_hw_metadata_free(hw_metadata); | |
1060 | consume_skb(skb); | |
1061 | } | |
1062 | } | |
1063 | ||
1064 | module_put(THIS_MODULE); | |
1065 | } | |
1066 | ||
7c747838 IS |
1067 | static int net_dm_trace_on_set(struct netlink_ext_ack *extack) |
1068 | { | |
28315f79 | 1069 | const struct net_dm_alert_ops *ops; |
70c69274 | 1070 | int cpu, rc; |
7c747838 | 1071 | |
28315f79 IS |
1072 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; |
1073 | ||
7c747838 IS |
1074 | if (!try_module_get(THIS_MODULE)) { |
1075 | NL_SET_ERR_MSG_MOD(extack, "Failed to take reference on module"); | |
1076 | return -ENODEV; | |
1077 | } | |
1078 | ||
70c69274 IS |
1079 | for_each_possible_cpu(cpu) { |
1080 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
44075f56 | 1081 | struct sk_buff *skb; |
70c69274 | 1082 | |
28315f79 | 1083 | INIT_WORK(&data->dm_alert_work, ops->work_item_func); |
70c69274 | 1084 | timer_setup(&data->send_timer, sched_send_work, 0); |
44075f56 IS |
1085 | /* Allocate a new per-CPU skb for the summary alert message and |
1086 | * free the old one which might contain stale data from | |
1087 | * previous tracing. | |
1088 | */ | |
1089 | skb = reset_per_cpu_data(data); | |
1090 | consume_skb(skb); | |
70c69274 IS |
1091 | } |
1092 | ||
28315f79 | 1093 | rc = register_trace_kfree_skb(ops->kfree_skb_probe, NULL); |
7c747838 IS |
1094 | if (rc) { |
1095 | NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to kfree_skb() tracepoint"); | |
1096 | goto err_module_put; | |
1097 | } | |
1098 | ||
28315f79 | 1099 | rc = register_trace_napi_poll(ops->napi_poll_probe, NULL); |
7c747838 IS |
1100 | if (rc) { |
1101 | NL_SET_ERR_MSG_MOD(extack, "Failed to connect probe to napi_poll() tracepoint"); | |
1102 | goto err_unregister_trace; | |
1103 | } | |
1104 | ||
1105 | return 0; | |
1106 | ||
1107 | err_unregister_trace: | |
28315f79 | 1108 | unregister_trace_kfree_skb(ops->kfree_skb_probe, NULL); |
7c747838 IS |
1109 | err_module_put: |
1110 | module_put(THIS_MODULE); | |
1111 | return rc; | |
1112 | } | |
1113 | ||
1114 | static void net_dm_trace_off_set(void) | |
1115 | { | |
1116 | struct dm_hw_stat_delta *new_stat, *temp; | |
28315f79 | 1117 | const struct net_dm_alert_ops *ops; |
70c69274 | 1118 | int cpu; |
7c747838 | 1119 | |
28315f79 IS |
1120 | ops = net_dm_alert_ops_arr[net_dm_alert_mode]; |
1121 | ||
1122 | unregister_trace_napi_poll(ops->napi_poll_probe, NULL); | |
1123 | unregister_trace_kfree_skb(ops->kfree_skb_probe, NULL); | |
7c747838 IS |
1124 | |
1125 | tracepoint_synchronize_unregister(); | |
1126 | ||
70c69274 IS |
1127 | /* Make sure we do not send notifications to user space after request |
1128 | * to stop tracing returns. | |
1129 | */ | |
1130 | for_each_possible_cpu(cpu) { | |
1131 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
ca30707d | 1132 | struct sk_buff *skb; |
70c69274 IS |
1133 | |
1134 | del_timer_sync(&data->send_timer); | |
1135 | cancel_work_sync(&data->dm_alert_work); | |
ca30707d IS |
1136 | while ((skb = __skb_dequeue(&data->drop_queue))) |
1137 | consume_skb(skb); | |
70c69274 IS |
1138 | } |
1139 | ||
7c747838 IS |
1140 | list_for_each_entry_safe(new_stat, temp, &hw_stats_list, list) { |
1141 | if (new_stat->dev == NULL) { | |
1142 | list_del_rcu(&new_stat->list); | |
1143 | kfree_rcu(new_stat, rcu); | |
1144 | } | |
1145 | } | |
1146 | ||
1147 | module_put(THIS_MODULE); | |
1148 | } | |
1149 | ||
96510096 | 1150 | static int set_all_monitor_traces(int state, struct netlink_ext_ack *extack) |
9a8afc8d NH |
1151 | { |
1152 | int rc = 0; | |
4ea7e386 | 1153 | |
4b706372 | 1154 | if (state == trace_state) { |
96510096 | 1155 | NL_SET_ERR_MSG_MOD(extack, "Trace state already set to requested state"); |
b19d9550 | 1156 | return -EAGAIN; |
4b706372 NH |
1157 | } |
1158 | ||
9a8afc8d NH |
1159 | switch (state) { |
1160 | case TRACE_ON: | |
7c747838 | 1161 | rc = net_dm_trace_on_set(extack); |
9a8afc8d NH |
1162 | break; |
1163 | case TRACE_OFF: | |
7c747838 | 1164 | net_dm_trace_off_set(); |
9a8afc8d NH |
1165 | break; |
1166 | default: | |
1167 | rc = 1; | |
1168 | break; | |
1169 | } | |
1170 | ||
4ea7e386 NH |
1171 | if (!rc) |
1172 | trace_state = state; | |
4b706372 NH |
1173 | else |
1174 | rc = -EINPROGRESS; | |
4ea7e386 | 1175 | |
9a8afc8d NH |
1176 | return rc; |
1177 | } | |
1178 | ||
80cebed8 IS |
1179 | static bool net_dm_is_monitoring(void) |
1180 | { | |
1181 | return trace_state == TRACE_ON || monitor_hw; | |
1182 | } | |
1183 | ||
ca30707d IS |
1184 | static int net_dm_alert_mode_get_from_info(struct genl_info *info, |
1185 | enum net_dm_alert_mode *p_alert_mode) | |
1186 | { | |
1187 | u8 val; | |
1188 | ||
1189 | val = nla_get_u8(info->attrs[NET_DM_ATTR_ALERT_MODE]); | |
1190 | ||
1191 | switch (val) { | |
1192 | case NET_DM_ALERT_MODE_SUMMARY: /* fall-through */ | |
1193 | case NET_DM_ALERT_MODE_PACKET: | |
1194 | *p_alert_mode = val; | |
1195 | break; | |
1196 | default: | |
1197 | return -EINVAL; | |
1198 | } | |
1199 | ||
1200 | return 0; | |
1201 | } | |
1202 | ||
1203 | static int net_dm_alert_mode_set(struct genl_info *info) | |
1204 | { | |
1205 | struct netlink_ext_ack *extack = info->extack; | |
1206 | enum net_dm_alert_mode alert_mode; | |
1207 | int rc; | |
1208 | ||
1209 | if (!info->attrs[NET_DM_ATTR_ALERT_MODE]) | |
1210 | return 0; | |
1211 | ||
1212 | rc = net_dm_alert_mode_get_from_info(info, &alert_mode); | |
1213 | if (rc) { | |
1214 | NL_SET_ERR_MSG_MOD(extack, "Invalid alert mode"); | |
1215 | return -EINVAL; | |
1216 | } | |
1217 | ||
1218 | net_dm_alert_mode = alert_mode; | |
1219 | ||
1220 | return 0; | |
1221 | } | |
1222 | ||
57986617 IS |
1223 | static void net_dm_trunc_len_set(struct genl_info *info) |
1224 | { | |
1225 | if (!info->attrs[NET_DM_ATTR_TRUNC_LEN]) | |
1226 | return; | |
1227 | ||
1228 | net_dm_trunc_len = nla_get_u32(info->attrs[NET_DM_ATTR_TRUNC_LEN]); | |
1229 | } | |
1230 | ||
30328d46 IS |
1231 | static void net_dm_queue_len_set(struct genl_info *info) |
1232 | { | |
1233 | if (!info->attrs[NET_DM_ATTR_QUEUE_LEN]) | |
1234 | return; | |
1235 | ||
1236 | net_dm_queue_len = nla_get_u32(info->attrs[NET_DM_ATTR_QUEUE_LEN]); | |
1237 | } | |
1238 | ||
9a8afc8d NH |
1239 | static int net_dm_cmd_config(struct sk_buff *skb, |
1240 | struct genl_info *info) | |
1241 | { | |
ca30707d IS |
1242 | struct netlink_ext_ack *extack = info->extack; |
1243 | int rc; | |
96510096 | 1244 | |
80cebed8 IS |
1245 | if (net_dm_is_monitoring()) { |
1246 | NL_SET_ERR_MSG_MOD(extack, "Cannot configure drop monitor during monitoring"); | |
ca30707d IS |
1247 | return -EBUSY; |
1248 | } | |
1249 | ||
1250 | rc = net_dm_alert_mode_set(info); | |
1251 | if (rc) | |
1252 | return rc; | |
1253 | ||
57986617 IS |
1254 | net_dm_trunc_len_set(info); |
1255 | ||
30328d46 IS |
1256 | net_dm_queue_len_set(info); |
1257 | ||
ca30707d | 1258 | return 0; |
9a8afc8d NH |
1259 | } |
1260 | ||
8e94c3bc IS |
1261 | static int net_dm_monitor_start(bool set_sw, bool set_hw, |
1262 | struct netlink_ext_ack *extack) | |
1263 | { | |
1264 | bool sw_set = false; | |
1265 | int rc; | |
1266 | ||
1267 | if (set_sw) { | |
1268 | rc = set_all_monitor_traces(TRACE_ON, extack); | |
1269 | if (rc) | |
1270 | return rc; | |
1271 | sw_set = true; | |
1272 | } | |
1273 | ||
1274 | if (set_hw) { | |
1275 | rc = net_dm_hw_monitor_start(extack); | |
1276 | if (rc) | |
1277 | goto err_monitor_hw; | |
1278 | } | |
1279 | ||
1280 | return 0; | |
1281 | ||
1282 | err_monitor_hw: | |
1283 | if (sw_set) | |
1284 | set_all_monitor_traces(TRACE_OFF, extack); | |
1285 | return rc; | |
1286 | } | |
1287 | ||
1288 | static void net_dm_monitor_stop(bool set_sw, bool set_hw, | |
1289 | struct netlink_ext_ack *extack) | |
1290 | { | |
1291 | if (set_hw) | |
1292 | net_dm_hw_monitor_stop(extack); | |
1293 | if (set_sw) | |
1294 | set_all_monitor_traces(TRACE_OFF, extack); | |
1295 | } | |
1296 | ||
9a8afc8d NH |
1297 | static int net_dm_cmd_trace(struct sk_buff *skb, |
1298 | struct genl_info *info) | |
1299 | { | |
8e94c3bc IS |
1300 | bool set_sw = !!info->attrs[NET_DM_ATTR_SW_DROPS]; |
1301 | bool set_hw = !!info->attrs[NET_DM_ATTR_HW_DROPS]; | |
1302 | struct netlink_ext_ack *extack = info->extack; | |
1303 | ||
1304 | /* To maintain backward compatibility, we start / stop monitoring of | |
1305 | * software drops if no flag is specified. | |
1306 | */ | |
1307 | if (!set_sw && !set_hw) | |
1308 | set_sw = true; | |
1309 | ||
9a8afc8d NH |
1310 | switch (info->genlhdr->cmd) { |
1311 | case NET_DM_CMD_START: | |
8e94c3bc | 1312 | return net_dm_monitor_start(set_sw, set_hw, extack); |
9a8afc8d | 1313 | case NET_DM_CMD_STOP: |
8e94c3bc IS |
1314 | net_dm_monitor_stop(set_sw, set_hw, extack); |
1315 | return 0; | |
9a8afc8d NH |
1316 | } |
1317 | ||
2230a7ef | 1318 | return -EOPNOTSUPP; |
9a8afc8d NH |
1319 | } |
1320 | ||
444be061 IS |
1321 | static int net_dm_config_fill(struct sk_buff *msg, struct genl_info *info) |
1322 | { | |
1323 | void *hdr; | |
1324 | ||
1325 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, | |
1326 | &net_drop_monitor_family, 0, NET_DM_CMD_CONFIG_NEW); | |
1327 | if (!hdr) | |
1328 | return -EMSGSIZE; | |
1329 | ||
1330 | if (nla_put_u8(msg, NET_DM_ATTR_ALERT_MODE, net_dm_alert_mode)) | |
1331 | goto nla_put_failure; | |
1332 | ||
1333 | if (nla_put_u32(msg, NET_DM_ATTR_TRUNC_LEN, net_dm_trunc_len)) | |
1334 | goto nla_put_failure; | |
1335 | ||
30328d46 IS |
1336 | if (nla_put_u32(msg, NET_DM_ATTR_QUEUE_LEN, net_dm_queue_len)) |
1337 | goto nla_put_failure; | |
1338 | ||
444be061 IS |
1339 | genlmsg_end(msg, hdr); |
1340 | ||
1341 | return 0; | |
1342 | ||
1343 | nla_put_failure: | |
1344 | genlmsg_cancel(msg, hdr); | |
1345 | return -EMSGSIZE; | |
1346 | } | |
1347 | ||
1348 | static int net_dm_cmd_config_get(struct sk_buff *skb, struct genl_info *info) | |
1349 | { | |
1350 | struct sk_buff *msg; | |
1351 | int rc; | |
1352 | ||
1353 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1354 | if (!msg) | |
1355 | return -ENOMEM; | |
1356 | ||
1357 | rc = net_dm_config_fill(msg, info); | |
1358 | if (rc) | |
1359 | goto free_msg; | |
1360 | ||
1361 | return genlmsg_reply(msg, info); | |
1362 | ||
1363 | free_msg: | |
1364 | nlmsg_free(msg); | |
1365 | return rc; | |
1366 | } | |
1367 | ||
e9feb580 IS |
1368 | static void net_dm_stats_read(struct net_dm_stats *stats) |
1369 | { | |
1370 | int cpu; | |
1371 | ||
1372 | memset(stats, 0, sizeof(*stats)); | |
1373 | for_each_possible_cpu(cpu) { | |
1374 | struct per_cpu_dm_data *data = &per_cpu(dm_cpu_data, cpu); | |
1375 | struct net_dm_stats *cpu_stats = &data->stats; | |
1376 | unsigned int start; | |
1377 | u64 dropped; | |
1378 | ||
1379 | do { | |
1380 | start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1381 | dropped = cpu_stats->dropped; | |
1382 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); | |
1383 | ||
1384 | stats->dropped += dropped; | |
1385 | } | |
1386 | } | |
1387 | ||
1388 | static int net_dm_stats_put(struct sk_buff *msg) | |
1389 | { | |
1390 | struct net_dm_stats stats; | |
1391 | struct nlattr *attr; | |
1392 | ||
1393 | net_dm_stats_read(&stats); | |
1394 | ||
1395 | attr = nla_nest_start(msg, NET_DM_ATTR_STATS); | |
1396 | if (!attr) | |
1397 | return -EMSGSIZE; | |
1398 | ||
1399 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_STATS_DROPPED, | |
1400 | stats.dropped, NET_DM_ATTR_PAD)) | |
1401 | goto nla_put_failure; | |
1402 | ||
1403 | nla_nest_end(msg, attr); | |
1404 | ||
1405 | return 0; | |
1406 | ||
1407 | nla_put_failure: | |
1408 | nla_nest_cancel(msg, attr); | |
1409 | return -EMSGSIZE; | |
1410 | } | |
1411 | ||
5e58109b IS |
1412 | static void net_dm_hw_stats_read(struct net_dm_stats *stats) |
1413 | { | |
1414 | int cpu; | |
1415 | ||
1416 | memset(stats, 0, sizeof(*stats)); | |
1417 | for_each_possible_cpu(cpu) { | |
1418 | struct per_cpu_dm_data *hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1419 | struct net_dm_stats *cpu_stats = &hw_data->stats; | |
1420 | unsigned int start; | |
1421 | u64 dropped; | |
1422 | ||
1423 | do { | |
1424 | start = u64_stats_fetch_begin_irq(&cpu_stats->syncp); | |
1425 | dropped = cpu_stats->dropped; | |
1426 | } while (u64_stats_fetch_retry_irq(&cpu_stats->syncp, start)); | |
1427 | ||
1428 | stats->dropped += dropped; | |
1429 | } | |
1430 | } | |
1431 | ||
1432 | static int net_dm_hw_stats_put(struct sk_buff *msg) | |
1433 | { | |
1434 | struct net_dm_stats stats; | |
1435 | struct nlattr *attr; | |
1436 | ||
1437 | net_dm_hw_stats_read(&stats); | |
1438 | ||
1439 | attr = nla_nest_start(msg, NET_DM_ATTR_HW_STATS); | |
1440 | if (!attr) | |
1441 | return -EMSGSIZE; | |
1442 | ||
1443 | if (nla_put_u64_64bit(msg, NET_DM_ATTR_STATS_DROPPED, | |
1444 | stats.dropped, NET_DM_ATTR_PAD)) | |
1445 | goto nla_put_failure; | |
1446 | ||
1447 | nla_nest_end(msg, attr); | |
1448 | ||
1449 | return 0; | |
1450 | ||
1451 | nla_put_failure: | |
1452 | nla_nest_cancel(msg, attr); | |
1453 | return -EMSGSIZE; | |
1454 | } | |
1455 | ||
e9feb580 IS |
1456 | static int net_dm_stats_fill(struct sk_buff *msg, struct genl_info *info) |
1457 | { | |
1458 | void *hdr; | |
1459 | int rc; | |
1460 | ||
1461 | hdr = genlmsg_put(msg, info->snd_portid, info->snd_seq, | |
1462 | &net_drop_monitor_family, 0, NET_DM_CMD_STATS_NEW); | |
1463 | if (!hdr) | |
1464 | return -EMSGSIZE; | |
1465 | ||
1466 | rc = net_dm_stats_put(msg); | |
1467 | if (rc) | |
1468 | goto nla_put_failure; | |
1469 | ||
5e58109b IS |
1470 | rc = net_dm_hw_stats_put(msg); |
1471 | if (rc) | |
1472 | goto nla_put_failure; | |
1473 | ||
e9feb580 IS |
1474 | genlmsg_end(msg, hdr); |
1475 | ||
1476 | return 0; | |
1477 | ||
1478 | nla_put_failure: | |
1479 | genlmsg_cancel(msg, hdr); | |
1480 | return -EMSGSIZE; | |
1481 | } | |
1482 | ||
1483 | static int net_dm_cmd_stats_get(struct sk_buff *skb, struct genl_info *info) | |
1484 | { | |
1485 | struct sk_buff *msg; | |
1486 | int rc; | |
1487 | ||
1488 | msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); | |
1489 | if (!msg) | |
1490 | return -ENOMEM; | |
1491 | ||
1492 | rc = net_dm_stats_fill(msg, info); | |
1493 | if (rc) | |
1494 | goto free_msg; | |
1495 | ||
1496 | return genlmsg_reply(msg, info); | |
1497 | ||
1498 | free_msg: | |
1499 | nlmsg_free(msg); | |
1500 | return rc; | |
1501 | } | |
1502 | ||
4ea7e386 | 1503 | static int dropmon_net_event(struct notifier_block *ev_block, |
351638e7 | 1504 | unsigned long event, void *ptr) |
4ea7e386 | 1505 | { |
351638e7 | 1506 | struct net_device *dev = netdev_notifier_info_to_dev(ptr); |
4ea7e386 NH |
1507 | struct dm_hw_stat_delta *new_stat = NULL; |
1508 | struct dm_hw_stat_delta *tmp; | |
1509 | ||
1510 | switch (event) { | |
1511 | case NETDEV_REGISTER: | |
1512 | new_stat = kzalloc(sizeof(struct dm_hw_stat_delta), GFP_KERNEL); | |
1513 | ||
1514 | if (!new_stat) | |
1515 | goto out; | |
1516 | ||
1517 | new_stat->dev = dev; | |
5848cc09 | 1518 | new_stat->last_rx = jiffies; |
dbf896b7 | 1519 | mutex_lock(&net_dm_mutex); |
4ea7e386 | 1520 | list_add_rcu(&new_stat->list, &hw_stats_list); |
dbf896b7 | 1521 | mutex_unlock(&net_dm_mutex); |
4ea7e386 NH |
1522 | break; |
1523 | case NETDEV_UNREGISTER: | |
dbf896b7 | 1524 | mutex_lock(&net_dm_mutex); |
4ea7e386 NH |
1525 | list_for_each_entry_safe(new_stat, tmp, &hw_stats_list, list) { |
1526 | if (new_stat->dev == dev) { | |
1527 | new_stat->dev = NULL; | |
1528 | if (trace_state == TRACE_OFF) { | |
1529 | list_del_rcu(&new_stat->list); | |
fa81c0e1 | 1530 | kfree_rcu(new_stat, rcu); |
4ea7e386 NH |
1531 | break; |
1532 | } | |
1533 | } | |
1534 | } | |
dbf896b7 | 1535 | mutex_unlock(&net_dm_mutex); |
4ea7e386 NH |
1536 | break; |
1537 | } | |
1538 | out: | |
1539 | return NOTIFY_DONE; | |
1540 | } | |
9a8afc8d | 1541 | |
ca30707d IS |
1542 | static const struct nla_policy net_dm_nl_policy[NET_DM_ATTR_MAX + 1] = { |
1543 | [NET_DM_ATTR_UNSPEC] = { .strict_start_type = NET_DM_ATTR_UNSPEC + 1 }, | |
1544 | [NET_DM_ATTR_ALERT_MODE] = { .type = NLA_U8 }, | |
57986617 | 1545 | [NET_DM_ATTR_TRUNC_LEN] = { .type = NLA_U32 }, |
30328d46 | 1546 | [NET_DM_ATTR_QUEUE_LEN] = { .type = NLA_U32 }, |
8e94c3bc IS |
1547 | [NET_DM_ATTR_SW_DROPS] = {. type = NLA_FLAG }, |
1548 | [NET_DM_ATTR_HW_DROPS] = {. type = NLA_FLAG }, | |
ca30707d IS |
1549 | }; |
1550 | ||
4534de83 | 1551 | static const struct genl_ops dropmon_ops[] = { |
9a8afc8d NH |
1552 | { |
1553 | .cmd = NET_DM_CMD_CONFIG, | |
ef6243ac | 1554 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d | 1555 | .doit = net_dm_cmd_config, |
c5ab9b1c | 1556 | .flags = GENL_ADMIN_PERM, |
9a8afc8d NH |
1557 | }, |
1558 | { | |
1559 | .cmd = NET_DM_CMD_START, | |
ef6243ac | 1560 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d NH |
1561 | .doit = net_dm_cmd_trace, |
1562 | }, | |
1563 | { | |
1564 | .cmd = NET_DM_CMD_STOP, | |
ef6243ac | 1565 | .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, |
9a8afc8d NH |
1566 | .doit = net_dm_cmd_trace, |
1567 | }, | |
444be061 IS |
1568 | { |
1569 | .cmd = NET_DM_CMD_CONFIG_GET, | |
1570 | .doit = net_dm_cmd_config_get, | |
1571 | }, | |
e9feb580 IS |
1572 | { |
1573 | .cmd = NET_DM_CMD_STATS_GET, | |
1574 | .doit = net_dm_cmd_stats_get, | |
1575 | }, | |
9a8afc8d NH |
1576 | }; |
1577 | ||
b19d9550 IS |
1578 | static int net_dm_nl_pre_doit(const struct genl_ops *ops, |
1579 | struct sk_buff *skb, struct genl_info *info) | |
1580 | { | |
1581 | mutex_lock(&net_dm_mutex); | |
1582 | ||
1583 | return 0; | |
1584 | } | |
1585 | ||
1586 | static void net_dm_nl_post_doit(const struct genl_ops *ops, | |
1587 | struct sk_buff *skb, struct genl_info *info) | |
1588 | { | |
1589 | mutex_unlock(&net_dm_mutex); | |
1590 | } | |
1591 | ||
56989f6d | 1592 | static struct genl_family net_drop_monitor_family __ro_after_init = { |
489111e5 JB |
1593 | .hdrsize = 0, |
1594 | .name = "NET_DM", | |
1595 | .version = 2, | |
ca30707d IS |
1596 | .maxattr = NET_DM_ATTR_MAX, |
1597 | .policy = net_dm_nl_policy, | |
b19d9550 IS |
1598 | .pre_doit = net_dm_nl_pre_doit, |
1599 | .post_doit = net_dm_nl_post_doit, | |
489111e5 JB |
1600 | .module = THIS_MODULE, |
1601 | .ops = dropmon_ops, | |
1602 | .n_ops = ARRAY_SIZE(dropmon_ops), | |
1603 | .mcgrps = dropmon_mcgrps, | |
1604 | .n_mcgrps = ARRAY_SIZE(dropmon_mcgrps), | |
1605 | }; | |
1606 | ||
4ea7e386 NH |
1607 | static struct notifier_block dropmon_net_notifier = { |
1608 | .notifier_call = dropmon_net_event | |
1609 | }; | |
1610 | ||
9b63f57d IS |
1611 | static void __net_dm_cpu_data_init(struct per_cpu_dm_data *data) |
1612 | { | |
1613 | spin_lock_init(&data->lock); | |
1614 | skb_queue_head_init(&data->drop_queue); | |
1615 | u64_stats_init(&data->stats.syncp); | |
1616 | } | |
1617 | ||
1618 | static void __net_dm_cpu_data_fini(struct per_cpu_dm_data *data) | |
1619 | { | |
1620 | WARN_ON(!skb_queue_empty(&data->drop_queue)); | |
1621 | } | |
1622 | ||
1623 | static void net_dm_cpu_data_init(int cpu) | |
9a8afc8d | 1624 | { |
9a8afc8d | 1625 | struct per_cpu_dm_data *data; |
9b63f57d IS |
1626 | |
1627 | data = &per_cpu(dm_cpu_data, cpu); | |
1628 | __net_dm_cpu_data_init(data); | |
1629 | } | |
1630 | ||
1631 | static void net_dm_cpu_data_fini(int cpu) | |
1632 | { | |
1633 | struct per_cpu_dm_data *data; | |
1634 | ||
1635 | data = &per_cpu(dm_cpu_data, cpu); | |
1636 | /* At this point, we should have exclusive access | |
1637 | * to this struct and can free the skb inside it. | |
1638 | */ | |
1639 | consume_skb(data->skb); | |
1640 | __net_dm_cpu_data_fini(data); | |
1641 | } | |
1642 | ||
cac1174f IS |
1643 | static void net_dm_hw_cpu_data_init(int cpu) |
1644 | { | |
1645 | struct per_cpu_dm_data *hw_data; | |
1646 | ||
1647 | hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
1648 | __net_dm_cpu_data_init(hw_data); | |
1649 | } | |
1650 | ||
1651 | static void net_dm_hw_cpu_data_fini(int cpu) | |
1652 | { | |
1653 | struct per_cpu_dm_data *hw_data; | |
1654 | ||
1655 | hw_data = &per_cpu(dm_hw_cpu_data, cpu); | |
d40e1deb | 1656 | kfree(hw_data->hw_entries); |
cac1174f IS |
1657 | __net_dm_cpu_data_fini(hw_data); |
1658 | } | |
1659 | ||
9b63f57d IS |
1660 | static int __init init_net_drop_monitor(void) |
1661 | { | |
a256be70 CG |
1662 | int cpu, rc; |
1663 | ||
e005d193 | 1664 | pr_info("Initializing network drop monitor service\n"); |
9a8afc8d NH |
1665 | |
1666 | if (sizeof(void *) > 8) { | |
e005d193 | 1667 | pr_err("Unable to store program counters on this arch, Drop monitor failed\n"); |
9a8afc8d NH |
1668 | return -ENOSPC; |
1669 | } | |
1670 | ||
489111e5 | 1671 | rc = genl_register_family(&net_drop_monitor_family); |
a256be70 | 1672 | if (rc) { |
e005d193 | 1673 | pr_err("Could not create drop monitor netlink family\n"); |
a256be70 | 1674 | return rc; |
9a8afc8d | 1675 | } |
2a94fe48 | 1676 | WARN_ON(net_drop_monitor_family.mcgrp_offset != NET_DM_GRP_ALERT); |
e5dcecba | 1677 | |
4ea7e386 NH |
1678 | rc = register_netdevice_notifier(&dropmon_net_notifier); |
1679 | if (rc < 0) { | |
e005d193 | 1680 | pr_crit("Failed to register netdevice notifier\n"); |
4ea7e386 NH |
1681 | goto out_unreg; |
1682 | } | |
1683 | ||
9a8afc8d NH |
1684 | rc = 0; |
1685 | ||
cac1174f | 1686 | for_each_possible_cpu(cpu) { |
9b63f57d | 1687 | net_dm_cpu_data_init(cpu); |
cac1174f IS |
1688 | net_dm_hw_cpu_data_init(cpu); |
1689 | } | |
4ea7e386 | 1690 | |
9a8afc8d NH |
1691 | goto out; |
1692 | ||
1693 | out_unreg: | |
1694 | genl_unregister_family(&net_drop_monitor_family); | |
1695 | out: | |
1696 | return rc; | |
1697 | } | |
1698 | ||
cad456d5 NH |
1699 | static void exit_net_drop_monitor(void) |
1700 | { | |
cad456d5 NH |
1701 | int cpu; |
1702 | ||
1703 | BUG_ON(unregister_netdevice_notifier(&dropmon_net_notifier)); | |
1704 | ||
1705 | /* | |
1706 | * Because of the module_get/put we do in the trace state change path | |
1707 | * we are guarnateed not to have any current users when we get here | |
cad456d5 NH |
1708 | */ |
1709 | ||
cac1174f IS |
1710 | for_each_possible_cpu(cpu) { |
1711 | net_dm_hw_cpu_data_fini(cpu); | |
9b63f57d | 1712 | net_dm_cpu_data_fini(cpu); |
cac1174f | 1713 | } |
cad456d5 NH |
1714 | |
1715 | BUG_ON(genl_unregister_family(&net_drop_monitor_family)); | |
1716 | } | |
1717 | ||
1718 | module_init(init_net_drop_monitor); | |
1719 | module_exit(exit_net_drop_monitor); | |
1720 | ||
1721 | MODULE_LICENSE("GPL v2"); | |
1722 | MODULE_AUTHOR("Neil Horman <nhorman@tuxdriver.com>"); | |
3fdcbd45 | 1723 | MODULE_ALIAS_GENL_FAMILY("NET_DM"); |