1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
|
// SPDX-License-Identifier: GPL-2.0-or-later
/* Copyright 2020 NXP */
#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/skbuff.h>
#include <linux/rtnetlink.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/act_api.h>
#include <net/netlink.h>
#include <net/pkt_cls.h>
#include <net/tc_act/tc_gate.h>
static unsigned int gate_net_id;
static struct tc_action_ops act_gate_ops;
static ktime_t gate_get_time(struct tcf_gate *gact)
{
ktime_t mono = ktime_get();
switch (gact->tk_offset) {
case TK_OFFS_MAX:
return mono;
default:
return ktime_mono_to_any(mono, gact->tk_offset);
}
return KTIME_MAX;
}
static void gate_get_start_time(struct tcf_gate *gact, ktime_t *start)
{
struct tcf_gate_params *param = &gact->param;
ktime_t now, base, cycle;
u64 n;
base = ns_to_ktime(param->tcfg_basetime);
now = gate_get_time(gact);
if (ktime_after(base, now)) {
*start = base;
return;
}
cycle = param->tcfg_cycletime;
n = div64_u64(ktime_sub_ns(now, base), cycle);
*start = ktime_add_ns(base, (n + 1) * cycle);
}
static void gate_start_timer(struct tcf_gate *gact, ktime_t start)
{
ktime_t expires;
expires = hrtimer_get_expires(&gact->hitimer);
if (expires == 0)
expires = KTIME_MAX;
start = min_t(ktime_t, start, expires);
hrtimer_start(&gact->hitimer, start, HRTIMER_MODE_ABS_SOFT);
}
static enum hrtimer_restart gate_timer_func(struct hrtimer *timer)
{
struct tcf_gate *gact = container_of(timer, struct tcf_gate,
hitimer);
struct tcf_gate_params *p = &gact->param;
struct tcfg_gate_entry *next;
ktime_t close_time, now;
spin_lock(&gact->tcf_lock);
next = gact->next_entry;
/* cycle start, clear pending bit, clear total octets */
gact->current_gate_status = next->gate_state ? GATE_ACT_GATE_OPEN : 0;
gact->current_entry_octets = 0;
gact->current_max_octets = next->maxoctets;
gact->current_close_time = ktime_add_ns(gact->current_close_time,
next->interval);
close_time = gact->current_close_time;
if (list_is_last(&next->list, &p->entries))
next = list_first_entry(&p->entries,
struct tcfg_gate_entry, list);
else
next = list_next_entry(next, list);
now = gate_get_time(gact);
if (ktime_after(now, close_time)) {
ktime_t cycle, base;
u64 n;
cycle = p->tcfg_cycletime;
base = ns_to_ktime(p->tcfg_basetime);
n = div64_u64(ktime_sub_ns(now, base), cycle);
close_time = ktime_add_ns(base, (n + 1) * cycle);
}
gact->next_entry = next;
hrtimer_set_expires(&gact->hitimer, close_time);
spin_unlock(&gact->tcf_lock);
return HRTIMER_RESTART;
}
static int tcf_gate_act(struct sk_buff *skb, const struct tc_action *a,
struct tcf_result *res)
{
struct tcf_gate *gact = to_gate(a);
spin_lock(&gact->tcf_lock);
tcf_lastuse_update(&gact->tcf_tm);
bstats_update(&gact->tcf_bstats, skb);
if (unlikely(gact->current_gate_status & GATE_ACT_PENDING)) {
spin_unlock(&gact->tcf_lock);
return gact->tcf_action;
}
if (!(gact->current_gate_status & GATE_ACT_GATE_OPEN))
goto drop;
if (gact->current_max_octets >= 0) {
gact->current_entry_octets += qdisc_pkt_len(skb);
if (gact->current_entry_octets > gact->current_max_octets) {
gact->tcf_qstats.overlimits++;
goto drop;
}
}
spin_unlock(&gact->tcf_lock);
return gact->tcf_action;
drop:
gact->tcf_qstats.drops++;
spin_unlock(&gact->tcf_lock);
return TC_ACT_SHOT;
}
static const struct nla_policy entry_policy[TCA_GATE_ENTRY_MAX + 1] = {
[TCA_GATE_ENTRY_INDEX] = { .type = NLA_U32 },
[TCA_GATE_ENTRY_GATE] = { .type = NLA_FLAG },
[TCA_GATE_ENTRY_INTERVAL] = { .type = NLA_U32 },
[TCA_GATE_ENTRY_IPV] = { .type = NLA_S32 },
[TCA_GATE_ENTRY_MAX_OCTETS] = { .type = NLA_S32 },
};
static const struct nla_policy gate_policy[TCA_GATE_MAX + 1] = {
[TCA_GATE_PARMS] = { .len = sizeof(struct tc_gate),
.type = NLA_EXACT_LEN },
[TCA_GATE_PRIORITY] = { .type = NLA_S32 },
[TCA_GATE_ENTRY_LIST] = { .type = NLA_NESTED },
[TCA_GATE_BASE_TIME] = { .type = NLA_U64 },
[TCA_GATE_CYCLE_TIME] = { .type = NLA_U64 },
[TCA_GATE_CYCLE_TIME_EXT] = { .type = NLA_U64 },
[TCA_GATE_FLAGS] = { .type = NLA_U32 },
[TCA_GATE_CLOCKID] = { .type = NLA_S32 },
};
static int fill_gate_entry(struct nlattr **tb, struct tcfg_gate_entry *entry,
struct netlink_ext_ack *extack)
{
u32 interval = 0;
entry->gate_state = nla_get_flag(tb[TCA_GATE_ENTRY_GATE]);
if (tb[TCA_GATE_ENTRY_INTERVAL])
interval = nla_get_u32(tb[TCA_GATE_ENTRY_INTERVAL]);
if (interval == 0) {
NL_SET_ERR_MSG(extack, "Invalid interval for schedule entry");
return -EINVAL;
}
entry->interval = interval;
if (tb[TCA_GATE_ENTRY_IPV])
entry->ipv = nla_get_s32(tb[TCA_GATE_ENTRY_IPV]);
else
entry->ipv = -1;
if (tb[TCA_GATE_ENTRY_MAX_OCTETS])
entry->maxoctets = nla_get_s32(tb[TCA_GATE_ENTRY_MAX_OCTETS]);
else
entry->maxoctets = -1;
return 0;
}
static int parse_gate_entry(struct nlattr *n, struct tcfg_gate_entry *entry,
int index, struct netlink_ext_ack *extack)
{
struct nlattr *tb[TCA_GATE_ENTRY_MAX + 1] = { };
int err;
err = nla_parse_nested(tb, TCA_GATE_ENTRY_MAX, n, entry_policy, extack);
if (err < 0) {
NL_SET_ERR_MSG(extack, "Could not parse nested entry");
return -EINVAL;
}
entry->index = index;
return fill_gate_entry(tb, entry, extack);
}
static void release_entry_list(struct list_head *entries)
{
struct tcfg_gate_entry *entry, *e;
list_for_each_entry_safe(entry, e, entries, list) {
list_del(&entry->list);
kfree(entry);
}
}
static int parse_gate_list(struct nlattr *list_attr,
struct tcf_gate_params *sched,
struct netlink_ext_ack *extack)
{
struct tcfg_gate_entry *entry;
struct nlattr *n;
int err, rem;
int i = 0;
if (!list_attr)
return -EINVAL;
nla_for_each_nested(n, list_attr, rem) {
if (nla_type(n) != TCA_GATE_ONE_ENTRY) {
NL_SET_ERR_MSG(extack, "Attribute isn't type 'entry'");
continue;
}
entry = kzalloc(sizeof(*entry), GFP_ATOMIC);
if (!entry) {
NL_SET_ERR_MSG(extack, "Not enough memory for entry");
err = -ENOMEM;
goto release_list;
}
err = parse_gate_entry(n, entry, i, extack);
if (err < 0) {
kfree(entry);
goto release_list;
}
list_add_tail(&entry->list, &sched->entries);
i++;
}
sched->num_entries = i;
return i;
release_list:
release_entry_list(&sched->entries);
return err;
}
static int tcf_gate_init(struct net *net, struct nlattr *nla,
struct nlattr *est, struct tc_action **a,
int ovr, int bind, bool rtnl_held,
struct tcf_proto *tp, u32 flags,
struct netlink_ext_ack *extack)
{
struct tc_action_net *tn = net_generic(net, gate_net_id);
enum tk_offsets tk_offset = TK_OFFS_TAI;
struct nlattr *tb[TCA_GATE_MAX + 1];
struct tcf_chain *goto_ch = NULL;
u64 cycletime = 0, basetime = 0;
struct tcf_gate_params *p;
s32 clockid = CLOCK_TAI;
struct tcf_gate *gact;
struct tc_gate *parm;
int ret = 0, err;
u32 gflags = 0;
s32 prio = -1;
ktime_t start;
u32 index;
if (!nla)
return -EINVAL;
err = nla_parse_nested(tb, TCA_GATE_MAX, nla, gate_policy, extack);
if (err < 0)
return err;
if (!tb[TCA_GATE_PARMS])
return -EINVAL;
parm = nla_data(tb[TCA_GATE_PARMS]);
index = parm->index;
err = tcf_idr_check_alloc(tn, &index, a, bind);
if (err < 0)
return err;
if (err && bind)
return 0;
if (!err) {
ret = tcf_idr_create(tn, index, est, a,
&act_gate_ops, bind, false, 0);
if (ret) {
tcf_idr_cleanup(tn, index);
return ret;
}
ret = ACT_P_CREATED;
} else if (!ovr) {
tcf_idr_release(*a, bind);
return -EEXIST;
}
if (ret == ACT_P_CREATED) {
to_gate(*a)->param.tcfg_clockid = -1;
INIT_LIST_HEAD(&(to_gate(*a)->param.entries));
}
if (tb[TCA_GATE_PRIORITY])
prio = nla_get_s32(tb[TCA_GATE_PRIORITY]);
if (tb[TCA_GATE_BASE_TIME])
basetime = nla_get_u64(tb[TCA_GATE_BASE_TIME]);
if (tb[TCA_GATE_FLAGS])
gflags = nla_get_u32(tb[TCA_GATE_FLAGS]);
if (tb[TCA_GATE_CLOCKID]) {
clockid = nla_get_s32(tb[TCA_GATE_CLOCKID]);
switch (clockid) {
case CLOCK_REALTIME:
tk_offset = TK_OFFS_REAL;
break;
case CLOCK_MONOTONIC:
tk_offset = TK_OFFS_MAX;
break;
case CLOCK_BOOTTIME:
tk_offset = TK_OFFS_BOOT;
break;
case CLOCK_TAI:
tk_offset = TK_OFFS_TAI;
break;
default:
NL_SET_ERR_MSG(extack, "Invalid 'clockid'");
goto release_idr;
}
}
err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
if (err < 0)
goto release_idr;
gact = to_gate(*a);
spin_lock_bh(&gact->tcf_lock);
p = &gact->param;
if (tb[TCA_GATE_CYCLE_TIME])
cycletime = nla_get_u64(tb[TCA_GATE_CYCLE_TIME]);
if (tb[TCA_GATE_ENTRY_LIST]) {
err = parse_gate_list(tb[TCA_GATE_ENTRY_LIST], p, extack);
if (err < 0)
goto chain_put;
}
if (!cycletime) {
struct tcfg_gate_entry *entry;
ktime_t cycle = 0;
list_for_each_entry(entry, &p->entries, list)
cycle = ktime_add_ns(cycle, entry->interval);
cycletime = cycle;
if (!cycletime) {
err = -EINVAL;
goto chain_put;
}
}
p->tcfg_cycletime = cycletime;
if (tb[TCA_GATE_CYCLE_TIME_EXT])
p->tcfg_cycletime_ext =
nla_get_u64(tb[TCA_GATE_CYCLE_TIME_EXT]);
p->tcfg_priority = prio;
p->tcfg_basetime = basetime;
p->tcfg_clockid = clockid;
p->tcfg_flags = gflags;
gact->tk_offset = tk_offset;
hrtimer_init(&gact->hitimer, clockid, HRTIMER_MODE_ABS_SOFT);
gact->hitimer.function = gate_timer_func;
gate_get_start_time(gact, &start);
gact->current_close_time = start;
gact->current_gate_status = GATE_ACT_GATE_OPEN | GATE_ACT_PENDING;
gact->next_entry = list_first_entry(&p->entries,
struct tcfg_gate_entry, list);
goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
gate_start_timer(gact, start);
spin_unlock_bh(&gact->tcf_lock);
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
if (ret == ACT_P_CREATED)
tcf_idr_insert(tn, *a);
return ret;
chain_put:
spin_unlock_bh(&gact->tcf_lock);
if (goto_ch)
tcf_chain_put_by_act(goto_ch);
release_idr:
tcf_idr_release(*a, bind);
return err;
}
static void tcf_gate_cleanup(struct tc_action *a)
{
struct tcf_gate *gact = to_gate(a);
struct tcf_gate_params *p;
p = &gact->param;
if (p->tcfg_clockid != -1)
hrtimer_cancel(&gact->hitimer);
release_entry_list(&p->entries);
}
static int dumping_entry(struct sk_buff *skb,
struct tcfg_gate_entry *entry)
{
struct nlattr *item;
item = nla_nest_start_noflag(skb, TCA_GATE_ONE_ENTRY);
if (!item)
return -ENOSPC;
if (nla_put_u32(skb, TCA_GATE_ENTRY_INDEX, entry->index))
goto nla_put_failure;
if (entry->gate_state && nla_put_flag(skb, TCA_GATE_ENTRY_GATE))
goto nla_put_failure;
if (nla_put_u32(skb, TCA_GATE_ENTRY_INTERVAL, entry->interval))
goto nla_put_failure;
if (nla_put_s32(skb, TCA_GATE_ENTRY_MAX_OCTETS, entry->maxoctets))
goto nla_put_failure;
if (nla_put_s32(skb, TCA_GATE_ENTRY_IPV, entry->ipv))
goto nla_put_failure;
return nla_nest_end(skb, item);
nla_put_failure:
nla_nest_cancel(skb, item);
return -1;
}
static int tcf_gate_dump(struct sk_buff *skb, struct tc_action *a,
int bind, int ref)
{
unsigned char *b = skb_tail_pointer(skb);
struct tcf_gate *gact = to_gate(a);
struct tc_gate opt = {
.index = gact->tcf_index,
.refcnt = refcount_read(&gact->tcf_refcnt) - ref,
.bindcnt = atomic_read(&gact->tcf_bindcnt) - bind,
};
struct tcfg_gate_entry *entry;
struct tcf_gate_params *p;
struct nlattr *entry_list;
struct tcf_t t;
spin_lock_bh(&gact->tcf_lock);
opt.action = gact->tcf_action;
p = &gact->param;
if (nla_put(skb, TCA_GATE_PARMS, sizeof(opt), &opt))
goto nla_put_failure;
if (nla_put_u64_64bit(skb, TCA_GATE_BASE_TIME,
p->tcfg_basetime, TCA_GATE_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME,
p->tcfg_cycletime, TCA_GATE_PAD))
goto nla_put_failure;
if (nla_put_u64_64bit(skb, TCA_GATE_CYCLE_TIME_EXT,
p->tcfg_cycletime_ext, TCA_GATE_PAD))
goto nla_put_failure;
if (nla_put_s32(skb, TCA_GATE_CLOCKID, p->tcfg_clockid))
goto nla_put_failure;
if (nla_put_u32(skb, TCA_GATE_FLAGS, p->tcfg_flags))
goto nla_put_failure;
if (nla_put_s32(skb, TCA_GATE_PRIORITY, p->tcfg_priority))
goto nla_put_failure;
entry_list = nla_nest_start_noflag(skb, TCA_GATE_ENTRY_LIST);
if (!entry_list)
goto nla_put_failure;
list_for_each_entry(entry, &p->entries, list) {
if (dumping_entry(skb, entry) < 0)
goto nla_put_failure;
}
nla_nest_end(skb, entry_list);
tcf_tm_dump(&t, &gact->tcf_tm);
if (nla_put_64bit(skb, TCA_GATE_TM, sizeof(t), &t, TCA_GATE_PAD))
goto nla_put_failure;
spin_unlock_bh(&gact->tcf_lock);
return skb->len;
nla_put_failure:
spin_unlock_bh(&gact->tcf_lock);
nlmsg_trim(skb, b);
return -1;
}
static int tcf_gate_walker(struct net *net, struct sk_buff *skb,
struct netlink_callback *cb, int type,
const struct tc_action_ops *ops,
struct netlink_ext_ack *extack)
{
struct tc_action_net *tn = net_generic(net, gate_net_id);
return tcf_generic_walker(tn, skb, cb, type, ops, extack);
}
static void tcf_gate_stats_update(struct tc_action *a, u64 bytes, u32 packets,
u64 lastuse, bool hw)
{
struct tcf_gate *gact = to_gate(a);
struct tcf_t *tm = &gact->tcf_tm;
tcf_action_update_stats(a, bytes, packets, false, hw);
tm->lastuse = max_t(u64, tm->lastuse, lastuse);
}
static int tcf_gate_search(struct net *net, struct tc_action **a, u32 index)
{
struct tc_action_net *tn = net_generic(net, gate_net_id);
return tcf_idr_search(tn, a, index);
}
static size_t tcf_gate_get_fill_size(const struct tc_action *act)
{
return nla_total_size(sizeof(struct tc_gate));
}
static struct tc_action_ops act_gate_ops = {
.kind = "gate",
.id = TCA_ID_GATE,
.owner = THIS_MODULE,
.act = tcf_gate_act,
.dump = tcf_gate_dump,
.init = tcf_gate_init,
.cleanup = tcf_gate_cleanup,
.walk = tcf_gate_walker,
.stats_update = tcf_gate_stats_update,
.get_fill_size = tcf_gate_get_fill_size,
.lookup = tcf_gate_search,
.size = sizeof(struct tcf_gate),
};
static __net_init int gate_init_net(struct net *net)
{
struct tc_action_net *tn = net_generic(net, gate_net_id);
return tc_action_net_init(net, tn, &act_gate_ops);
}
static void __net_exit gate_exit_net(struct list_head *net_list)
{
tc_action_net_exit(net_list, gate_net_id);
}
static struct pernet_operations gate_net_ops = {
.init = gate_init_net,
.exit_batch = gate_exit_net,
.id = &gate_net_id,
.size = sizeof(struct tc_action_net),
};
static int __init gate_init_module(void)
{
return tcf_register_action(&act_gate_ops, &gate_net_ops);
}
static void __exit gate_cleanup_module(void)
{
tcf_unregister_action(&act_gate_ops, &gate_net_ops);
}
module_init(gate_init_module);
module_exit(gate_cleanup_module);
MODULE_LICENSE("GPL v2");
|