1
2
3
4#include <linux/bpf.h>
5#include <linux/rcupdate.h>
6#include <linux/random.h>
7#include <linux/smp.h>
8#include <linux/topology.h>
9#include <linux/ktime.h>
10#include <linux/sched.h>
11#include <linux/uidgid.h>
12#include <linux/filter.h>
13#include <linux/ctype.h>
14#include <linux/jiffies.h>
15#include <linux/pid_namespace.h>
16#include <linux/proc_ns.h>
17#include <linux/security.h>
18
19#include "../../lib/kstrtox.h"
20
21
22
23
24
25
26
27
28
29
30BPF_CALL_2(bpf_map_lookup_elem, struct bpf_map *, map, void *, key)
31{
32 WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
33 return (unsigned long) map->ops->map_lookup_elem(map, key);
34}
35
36const struct bpf_func_proto bpf_map_lookup_elem_proto = {
37 .func = bpf_map_lookup_elem,
38 .gpl_only = false,
39 .pkt_access = true,
40 .ret_type = RET_PTR_TO_MAP_VALUE_OR_NULL,
41 .arg1_type = ARG_CONST_MAP_PTR,
42 .arg2_type = ARG_PTR_TO_MAP_KEY,
43};
44
45BPF_CALL_4(bpf_map_update_elem, struct bpf_map *, map, void *, key,
46 void *, value, u64, flags)
47{
48 WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
49 return map->ops->map_update_elem(map, key, value, flags);
50}
51
52const struct bpf_func_proto bpf_map_update_elem_proto = {
53 .func = bpf_map_update_elem,
54 .gpl_only = false,
55 .pkt_access = true,
56 .ret_type = RET_INTEGER,
57 .arg1_type = ARG_CONST_MAP_PTR,
58 .arg2_type = ARG_PTR_TO_MAP_KEY,
59 .arg3_type = ARG_PTR_TO_MAP_VALUE,
60 .arg4_type = ARG_ANYTHING,
61};
62
63BPF_CALL_2(bpf_map_delete_elem, struct bpf_map *, map, void *, key)
64{
65 WARN_ON_ONCE(!rcu_read_lock_held() && !rcu_read_lock_bh_held());
66 return map->ops->map_delete_elem(map, key);
67}
68
69const struct bpf_func_proto bpf_map_delete_elem_proto = {
70 .func = bpf_map_delete_elem,
71 .gpl_only = false,
72 .pkt_access = true,
73 .ret_type = RET_INTEGER,
74 .arg1_type = ARG_CONST_MAP_PTR,
75 .arg2_type = ARG_PTR_TO_MAP_KEY,
76};
77
78BPF_CALL_3(bpf_map_push_elem, struct bpf_map *, map, void *, value, u64, flags)
79{
80 return map->ops->map_push_elem(map, value, flags);
81}
82
83const struct bpf_func_proto bpf_map_push_elem_proto = {
84 .func = bpf_map_push_elem,
85 .gpl_only = false,
86 .pkt_access = true,
87 .ret_type = RET_INTEGER,
88 .arg1_type = ARG_CONST_MAP_PTR,
89 .arg2_type = ARG_PTR_TO_MAP_VALUE,
90 .arg3_type = ARG_ANYTHING,
91};
92
93BPF_CALL_2(bpf_map_pop_elem, struct bpf_map *, map, void *, value)
94{
95 return map->ops->map_pop_elem(map, value);
96}
97
98const struct bpf_func_proto bpf_map_pop_elem_proto = {
99 .func = bpf_map_pop_elem,
100 .gpl_only = false,
101 .ret_type = RET_INTEGER,
102 .arg1_type = ARG_CONST_MAP_PTR,
103 .arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE,
104};
105
106BPF_CALL_2(bpf_map_peek_elem, struct bpf_map *, map, void *, value)
107{
108 return map->ops->map_peek_elem(map, value);
109}
110
111const struct bpf_func_proto bpf_map_peek_elem_proto = {
112 .func = bpf_map_peek_elem,
113 .gpl_only = false,
114 .ret_type = RET_INTEGER,
115 .arg1_type = ARG_CONST_MAP_PTR,
116 .arg2_type = ARG_PTR_TO_UNINIT_MAP_VALUE,
117};
118
119const struct bpf_func_proto bpf_get_prandom_u32_proto = {
120 .func = bpf_user_rnd_u32,
121 .gpl_only = false,
122 .ret_type = RET_INTEGER,
123};
124
125BPF_CALL_0(bpf_get_smp_processor_id)
126{
127 return smp_processor_id();
128}
129
130const struct bpf_func_proto bpf_get_smp_processor_id_proto = {
131 .func = bpf_get_smp_processor_id,
132 .gpl_only = false,
133 .ret_type = RET_INTEGER,
134};
135
136BPF_CALL_0(bpf_get_numa_node_id)
137{
138 return numa_node_id();
139}
140
141const struct bpf_func_proto bpf_get_numa_node_id_proto = {
142 .func = bpf_get_numa_node_id,
143 .gpl_only = false,
144 .ret_type = RET_INTEGER,
145};
146
147BPF_CALL_0(bpf_ktime_get_ns)
148{
149
150 return ktime_get_mono_fast_ns();
151}
152
153const struct bpf_func_proto bpf_ktime_get_ns_proto = {
154 .func = bpf_ktime_get_ns,
155 .gpl_only = false,
156 .ret_type = RET_INTEGER,
157};
158
159BPF_CALL_0(bpf_ktime_get_boot_ns)
160{
161
162 return ktime_get_boot_fast_ns();
163}
164
165const struct bpf_func_proto bpf_ktime_get_boot_ns_proto = {
166 .func = bpf_ktime_get_boot_ns,
167 .gpl_only = false,
168 .ret_type = RET_INTEGER,
169};
170
171BPF_CALL_0(bpf_ktime_get_coarse_ns)
172{
173 return ktime_get_coarse_ns();
174}
175
176const struct bpf_func_proto bpf_ktime_get_coarse_ns_proto = {
177 .func = bpf_ktime_get_coarse_ns,
178 .gpl_only = false,
179 .ret_type = RET_INTEGER,
180};
181
182BPF_CALL_0(bpf_get_current_pid_tgid)
183{
184 struct task_struct *task = current;
185
186 if (unlikely(!task))
187 return -EINVAL;
188
189 return (u64) task->tgid << 32 | task->pid;
190}
191
192const struct bpf_func_proto bpf_get_current_pid_tgid_proto = {
193 .func = bpf_get_current_pid_tgid,
194 .gpl_only = false,
195 .ret_type = RET_INTEGER,
196};
197
198BPF_CALL_0(bpf_get_current_uid_gid)
199{
200 struct task_struct *task = current;
201 kuid_t uid;
202 kgid_t gid;
203
204 if (unlikely(!task))
205 return -EINVAL;
206
207 current_uid_gid(&uid, &gid);
208 return (u64) from_kgid(&init_user_ns, gid) << 32 |
209 from_kuid(&init_user_ns, uid);
210}
211
212const struct bpf_func_proto bpf_get_current_uid_gid_proto = {
213 .func = bpf_get_current_uid_gid,
214 .gpl_only = false,
215 .ret_type = RET_INTEGER,
216};
217
218BPF_CALL_2(bpf_get_current_comm, char *, buf, u32, size)
219{
220 struct task_struct *task = current;
221
222 if (unlikely(!task))
223 goto err_clear;
224
225 strncpy(buf, task->comm, size);
226
227
228
229
230
231 buf[size - 1] = 0;
232 return 0;
233err_clear:
234 memset(buf, 0, size);
235 return -EINVAL;
236}
237
238const struct bpf_func_proto bpf_get_current_comm_proto = {
239 .func = bpf_get_current_comm,
240 .gpl_only = false,
241 .ret_type = RET_INTEGER,
242 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
243 .arg2_type = ARG_CONST_SIZE,
244};
245
246#if defined(CONFIG_QUEUED_SPINLOCKS) || defined(CONFIG_BPF_ARCH_SPINLOCK)
247
248static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
249{
250 arch_spinlock_t *l = (void *)lock;
251 union {
252 __u32 val;
253 arch_spinlock_t lock;
254 } u = { .lock = __ARCH_SPIN_LOCK_UNLOCKED };
255
256 compiletime_assert(u.val == 0, "__ARCH_SPIN_LOCK_UNLOCKED not 0");
257 BUILD_BUG_ON(sizeof(*l) != sizeof(__u32));
258 BUILD_BUG_ON(sizeof(*lock) != sizeof(__u32));
259 arch_spin_lock(l);
260}
261
262static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
263{
264 arch_spinlock_t *l = (void *)lock;
265
266 arch_spin_unlock(l);
267}
268
269#else
270
271static inline void __bpf_spin_lock(struct bpf_spin_lock *lock)
272{
273 atomic_t *l = (void *)lock;
274
275 BUILD_BUG_ON(sizeof(*l) != sizeof(*lock));
276 do {
277 atomic_cond_read_relaxed(l, !VAL);
278 } while (atomic_xchg(l, 1));
279}
280
281static inline void __bpf_spin_unlock(struct bpf_spin_lock *lock)
282{
283 atomic_t *l = (void *)lock;
284
285 atomic_set_release(l, 0);
286}
287
288#endif
289
290static DEFINE_PER_CPU(unsigned long, irqsave_flags);
291
292static inline void __bpf_spin_lock_irqsave(struct bpf_spin_lock *lock)
293{
294 unsigned long flags;
295
296 local_irq_save(flags);
297 __bpf_spin_lock(lock);
298 __this_cpu_write(irqsave_flags, flags);
299}
300
301notrace BPF_CALL_1(bpf_spin_lock, struct bpf_spin_lock *, lock)
302{
303 __bpf_spin_lock_irqsave(lock);
304 return 0;
305}
306
307const struct bpf_func_proto bpf_spin_lock_proto = {
308 .func = bpf_spin_lock,
309 .gpl_only = false,
310 .ret_type = RET_VOID,
311 .arg1_type = ARG_PTR_TO_SPIN_LOCK,
312};
313
314static inline void __bpf_spin_unlock_irqrestore(struct bpf_spin_lock *lock)
315{
316 unsigned long flags;
317
318 flags = __this_cpu_read(irqsave_flags);
319 __bpf_spin_unlock(lock);
320 local_irq_restore(flags);
321}
322
323notrace BPF_CALL_1(bpf_spin_unlock, struct bpf_spin_lock *, lock)
324{
325 __bpf_spin_unlock_irqrestore(lock);
326 return 0;
327}
328
329const struct bpf_func_proto bpf_spin_unlock_proto = {
330 .func = bpf_spin_unlock,
331 .gpl_only = false,
332 .ret_type = RET_VOID,
333 .arg1_type = ARG_PTR_TO_SPIN_LOCK,
334};
335
336void copy_map_value_locked(struct bpf_map *map, void *dst, void *src,
337 bool lock_src)
338{
339 struct bpf_spin_lock *lock;
340
341 if (lock_src)
342 lock = src + map->spin_lock_off;
343 else
344 lock = dst + map->spin_lock_off;
345 preempt_disable();
346 __bpf_spin_lock_irqsave(lock);
347 copy_map_value(map, dst, src);
348 __bpf_spin_unlock_irqrestore(lock);
349 preempt_enable();
350}
351
352BPF_CALL_0(bpf_jiffies64)
353{
354 return get_jiffies_64();
355}
356
357const struct bpf_func_proto bpf_jiffies64_proto = {
358 .func = bpf_jiffies64,
359 .gpl_only = false,
360 .ret_type = RET_INTEGER,
361};
362
363#ifdef CONFIG_CGROUPS
364BPF_CALL_0(bpf_get_current_cgroup_id)
365{
366 struct cgroup *cgrp;
367 u64 cgrp_id;
368
369 rcu_read_lock();
370 cgrp = task_dfl_cgroup(current);
371 cgrp_id = cgroup_id(cgrp);
372 rcu_read_unlock();
373
374 return cgrp_id;
375}
376
377const struct bpf_func_proto bpf_get_current_cgroup_id_proto = {
378 .func = bpf_get_current_cgroup_id,
379 .gpl_only = false,
380 .ret_type = RET_INTEGER,
381};
382
383BPF_CALL_1(bpf_get_current_ancestor_cgroup_id, int, ancestor_level)
384{
385 struct cgroup *cgrp;
386 struct cgroup *ancestor;
387 u64 cgrp_id;
388
389 rcu_read_lock();
390 cgrp = task_dfl_cgroup(current);
391 ancestor = cgroup_ancestor(cgrp, ancestor_level);
392 cgrp_id = ancestor ? cgroup_id(ancestor) : 0;
393 rcu_read_unlock();
394
395 return cgrp_id;
396}
397
398const struct bpf_func_proto bpf_get_current_ancestor_cgroup_id_proto = {
399 .func = bpf_get_current_ancestor_cgroup_id,
400 .gpl_only = false,
401 .ret_type = RET_INTEGER,
402 .arg1_type = ARG_ANYTHING,
403};
404
405#ifdef CONFIG_CGROUP_BPF
406
407BPF_CALL_2(bpf_get_local_storage, struct bpf_map *, map, u64, flags)
408{
409
410
411
412
413 enum bpf_cgroup_storage_type stype = cgroup_storage_type(map);
414 struct bpf_cgroup_storage *storage;
415 struct bpf_cg_run_ctx *ctx;
416 void *ptr;
417
418
419 ctx = container_of(current->bpf_ctx, struct bpf_cg_run_ctx, run_ctx);
420 storage = ctx->prog_item->cgroup_storage[stype];
421
422 if (stype == BPF_CGROUP_STORAGE_SHARED)
423 ptr = &READ_ONCE(storage->buf)->data[0];
424 else
425 ptr = this_cpu_ptr(storage->percpu_buf);
426
427 return (unsigned long)ptr;
428}
429
430const struct bpf_func_proto bpf_get_local_storage_proto = {
431 .func = bpf_get_local_storage,
432 .gpl_only = false,
433 .ret_type = RET_PTR_TO_MAP_VALUE,
434 .arg1_type = ARG_CONST_MAP_PTR,
435 .arg2_type = ARG_ANYTHING,
436};
437#endif
438
439#define BPF_STRTOX_BASE_MASK 0x1F
440
441static int __bpf_strtoull(const char *buf, size_t buf_len, u64 flags,
442 unsigned long long *res, bool *is_negative)
443{
444 unsigned int base = flags & BPF_STRTOX_BASE_MASK;
445 const char *cur_buf = buf;
446 size_t cur_len = buf_len;
447 unsigned int consumed;
448 size_t val_len;
449 char str[64];
450
451 if (!buf || !buf_len || !res || !is_negative)
452 return -EINVAL;
453
454 if (base != 0 && base != 8 && base != 10 && base != 16)
455 return -EINVAL;
456
457 if (flags & ~BPF_STRTOX_BASE_MASK)
458 return -EINVAL;
459
460 while (cur_buf < buf + buf_len && isspace(*cur_buf))
461 ++cur_buf;
462
463 *is_negative = (cur_buf < buf + buf_len && *cur_buf == '-');
464 if (*is_negative)
465 ++cur_buf;
466
467 consumed = cur_buf - buf;
468 cur_len -= consumed;
469 if (!cur_len)
470 return -EINVAL;
471
472 cur_len = min(cur_len, sizeof(str) - 1);
473 memcpy(str, cur_buf, cur_len);
474 str[cur_len] = '\0';
475 cur_buf = str;
476
477 cur_buf = _parse_integer_fixup_radix(cur_buf, &base);
478 val_len = _parse_integer(cur_buf, base, res);
479
480 if (val_len & KSTRTOX_OVERFLOW)
481 return -ERANGE;
482
483 if (val_len == 0)
484 return -EINVAL;
485
486 cur_buf += val_len;
487 consumed += cur_buf - str;
488
489 return consumed;
490}
491
492static int __bpf_strtoll(const char *buf, size_t buf_len, u64 flags,
493 long long *res)
494{
495 unsigned long long _res;
496 bool is_negative;
497 int err;
498
499 err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
500 if (err < 0)
501 return err;
502 if (is_negative) {
503 if ((long long)-_res > 0)
504 return -ERANGE;
505 *res = -_res;
506 } else {
507 if ((long long)_res < 0)
508 return -ERANGE;
509 *res = _res;
510 }
511 return err;
512}
513
514BPF_CALL_4(bpf_strtol, const char *, buf, size_t, buf_len, u64, flags,
515 long *, res)
516{
517 long long _res;
518 int err;
519
520 err = __bpf_strtoll(buf, buf_len, flags, &_res);
521 if (err < 0)
522 return err;
523 if (_res != (long)_res)
524 return -ERANGE;
525 *res = _res;
526 return err;
527}
528
529const struct bpf_func_proto bpf_strtol_proto = {
530 .func = bpf_strtol,
531 .gpl_only = false,
532 .ret_type = RET_INTEGER,
533 .arg1_type = ARG_PTR_TO_MEM,
534 .arg2_type = ARG_CONST_SIZE,
535 .arg3_type = ARG_ANYTHING,
536 .arg4_type = ARG_PTR_TO_LONG,
537};
538
539BPF_CALL_4(bpf_strtoul, const char *, buf, size_t, buf_len, u64, flags,
540 unsigned long *, res)
541{
542 unsigned long long _res;
543 bool is_negative;
544 int err;
545
546 err = __bpf_strtoull(buf, buf_len, flags, &_res, &is_negative);
547 if (err < 0)
548 return err;
549 if (is_negative)
550 return -EINVAL;
551 if (_res != (unsigned long)_res)
552 return -ERANGE;
553 *res = _res;
554 return err;
555}
556
557const struct bpf_func_proto bpf_strtoul_proto = {
558 .func = bpf_strtoul,
559 .gpl_only = false,
560 .ret_type = RET_INTEGER,
561 .arg1_type = ARG_PTR_TO_MEM,
562 .arg2_type = ARG_CONST_SIZE,
563 .arg3_type = ARG_ANYTHING,
564 .arg4_type = ARG_PTR_TO_LONG,
565};
566#endif
567
568BPF_CALL_4(bpf_get_ns_current_pid_tgid, u64, dev, u64, ino,
569 struct bpf_pidns_info *, nsdata, u32, size)
570{
571 struct task_struct *task = current;
572 struct pid_namespace *pidns;
573 int err = -EINVAL;
574
575 if (unlikely(size != sizeof(struct bpf_pidns_info)))
576 goto clear;
577
578 if (unlikely((u64)(dev_t)dev != dev))
579 goto clear;
580
581 if (unlikely(!task))
582 goto clear;
583
584 pidns = task_active_pid_ns(task);
585 if (unlikely(!pidns)) {
586 err = -ENOENT;
587 goto clear;
588 }
589
590 if (!ns_match(&pidns->ns, (dev_t)dev, ino))
591 goto clear;
592
593 nsdata->pid = task_pid_nr_ns(task, pidns);
594 nsdata->tgid = task_tgid_nr_ns(task, pidns);
595 return 0;
596clear:
597 memset((void *)nsdata, 0, (size_t) size);
598 return err;
599}
600
601const struct bpf_func_proto bpf_get_ns_current_pid_tgid_proto = {
602 .func = bpf_get_ns_current_pid_tgid,
603 .gpl_only = false,
604 .ret_type = RET_INTEGER,
605 .arg1_type = ARG_ANYTHING,
606 .arg2_type = ARG_ANYTHING,
607 .arg3_type = ARG_PTR_TO_UNINIT_MEM,
608 .arg4_type = ARG_CONST_SIZE,
609};
610
611static const struct bpf_func_proto bpf_get_raw_smp_processor_id_proto = {
612 .func = bpf_get_raw_cpu_id,
613 .gpl_only = false,
614 .ret_type = RET_INTEGER,
615};
616
617BPF_CALL_5(bpf_event_output_data, void *, ctx, struct bpf_map *, map,
618 u64, flags, void *, data, u64, size)
619{
620 if (unlikely(flags & ~(BPF_F_INDEX_MASK)))
621 return -EINVAL;
622
623 return bpf_event_output(map, flags, data, size, NULL, 0, NULL);
624}
625
626const struct bpf_func_proto bpf_event_output_data_proto = {
627 .func = bpf_event_output_data,
628 .gpl_only = true,
629 .ret_type = RET_INTEGER,
630 .arg1_type = ARG_PTR_TO_CTX,
631 .arg2_type = ARG_CONST_MAP_PTR,
632 .arg3_type = ARG_ANYTHING,
633 .arg4_type = ARG_PTR_TO_MEM,
634 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
635};
636
637BPF_CALL_3(bpf_copy_from_user, void *, dst, u32, size,
638 const void __user *, user_ptr)
639{
640 int ret = copy_from_user(dst, user_ptr, size);
641
642 if (unlikely(ret)) {
643 memset(dst, 0, size);
644 ret = -EFAULT;
645 }
646
647 return ret;
648}
649
650const struct bpf_func_proto bpf_copy_from_user_proto = {
651 .func = bpf_copy_from_user,
652 .gpl_only = false,
653 .ret_type = RET_INTEGER,
654 .arg1_type = ARG_PTR_TO_UNINIT_MEM,
655 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
656 .arg3_type = ARG_ANYTHING,
657};
658
659BPF_CALL_2(bpf_per_cpu_ptr, const void *, ptr, u32, cpu)
660{
661 if (cpu >= nr_cpu_ids)
662 return (unsigned long)NULL;
663
664 return (unsigned long)per_cpu_ptr((const void __percpu *)ptr, cpu);
665}
666
667const struct bpf_func_proto bpf_per_cpu_ptr_proto = {
668 .func = bpf_per_cpu_ptr,
669 .gpl_only = false,
670 .ret_type = RET_PTR_TO_MEM_OR_BTF_ID_OR_NULL,
671 .arg1_type = ARG_PTR_TO_PERCPU_BTF_ID,
672 .arg2_type = ARG_ANYTHING,
673};
674
675BPF_CALL_1(bpf_this_cpu_ptr, const void *, percpu_ptr)
676{
677 return (unsigned long)this_cpu_ptr((const void __percpu *)percpu_ptr);
678}
679
680const struct bpf_func_proto bpf_this_cpu_ptr_proto = {
681 .func = bpf_this_cpu_ptr,
682 .gpl_only = false,
683 .ret_type = RET_PTR_TO_MEM_OR_BTF_ID,
684 .arg1_type = ARG_PTR_TO_PERCPU_BTF_ID,
685};
686
687static int bpf_trace_copy_string(char *buf, void *unsafe_ptr, char fmt_ptype,
688 size_t bufsz)
689{
690 void __user *user_ptr = (__force void __user *)unsafe_ptr;
691
692 buf[0] = 0;
693
694 switch (fmt_ptype) {
695 case 's':
696#ifdef CONFIG_ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE
697 if ((unsigned long)unsafe_ptr < TASK_SIZE)
698 return strncpy_from_user_nofault(buf, user_ptr, bufsz);
699 fallthrough;
700#endif
701 case 'k':
702 return strncpy_from_kernel_nofault(buf, unsafe_ptr, bufsz);
703 case 'u':
704 return strncpy_from_user_nofault(buf, user_ptr, bufsz);
705 }
706
707 return -EINVAL;
708}
709
710
711
712
713#define MAX_BPRINTF_BUF_LEN 512
714
715
716#define MAX_BPRINTF_NEST_LEVEL 3
717struct bpf_bprintf_buffers {
718 char tmp_bufs[MAX_BPRINTF_NEST_LEVEL][MAX_BPRINTF_BUF_LEN];
719};
720static DEFINE_PER_CPU(struct bpf_bprintf_buffers, bpf_bprintf_bufs);
721static DEFINE_PER_CPU(int, bpf_bprintf_nest_level);
722
723static int try_get_fmt_tmp_buf(char **tmp_buf)
724{
725 struct bpf_bprintf_buffers *bufs;
726 int nest_level;
727
728 preempt_disable();
729 nest_level = this_cpu_inc_return(bpf_bprintf_nest_level);
730 if (WARN_ON_ONCE(nest_level > MAX_BPRINTF_NEST_LEVEL)) {
731 this_cpu_dec(bpf_bprintf_nest_level);
732 preempt_enable();
733 return -EBUSY;
734 }
735 bufs = this_cpu_ptr(&bpf_bprintf_bufs);
736 *tmp_buf = bufs->tmp_bufs[nest_level - 1];
737
738 return 0;
739}
740
741void bpf_bprintf_cleanup(void)
742{
743 if (this_cpu_read(bpf_bprintf_nest_level)) {
744 this_cpu_dec(bpf_bprintf_nest_level);
745 preempt_enable();
746 }
747}
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763int bpf_bprintf_prepare(char *fmt, u32 fmt_size, const u64 *raw_args,
764 u32 **bin_args, u32 num_args)
765{
766 char *unsafe_ptr = NULL, *tmp_buf = NULL, *tmp_buf_end, *fmt_end;
767 size_t sizeof_cur_arg, sizeof_cur_ip;
768 int err, i, num_spec = 0;
769 u64 cur_arg;
770 char fmt_ptype, cur_ip[16], ip_spec[] = "%pXX";
771
772 fmt_end = strnchr(fmt, fmt_size, 0);
773 if (!fmt_end)
774 return -EINVAL;
775 fmt_size = fmt_end - fmt;
776
777 if (bin_args) {
778 if (num_args && try_get_fmt_tmp_buf(&tmp_buf))
779 return -EBUSY;
780
781 tmp_buf_end = tmp_buf + MAX_BPRINTF_BUF_LEN;
782 *bin_args = (u32 *)tmp_buf;
783 }
784
785 for (i = 0; i < fmt_size; i++) {
786 if ((!isprint(fmt[i]) && !isspace(fmt[i])) || !isascii(fmt[i])) {
787 err = -EINVAL;
788 goto out;
789 }
790
791 if (fmt[i] != '%')
792 continue;
793
794 if (fmt[i + 1] == '%') {
795 i++;
796 continue;
797 }
798
799 if (num_spec >= num_args) {
800 err = -EINVAL;
801 goto out;
802 }
803
804
805
806
807 i++;
808
809
810 while (fmt[i] == '0' || fmt[i] == '+' || fmt[i] == '-' ||
811 fmt[i] == ' ')
812 i++;
813 if (fmt[i] >= '1' && fmt[i] <= '9') {
814 i++;
815 while (fmt[i] >= '0' && fmt[i] <= '9')
816 i++;
817 }
818
819 if (fmt[i] == 'p') {
820 sizeof_cur_arg = sizeof(long);
821
822 if ((fmt[i + 1] == 'k' || fmt[i + 1] == 'u') &&
823 fmt[i + 2] == 's') {
824 fmt_ptype = fmt[i + 1];
825 i += 2;
826 goto fmt_str;
827 }
828
829 if (fmt[i + 1] == 0 || isspace(fmt[i + 1]) ||
830 ispunct(fmt[i + 1]) || fmt[i + 1] == 'K' ||
831 fmt[i + 1] == 'x' || fmt[i + 1] == 's' ||
832 fmt[i + 1] == 'S') {
833
834 if (tmp_buf)
835 cur_arg = raw_args[num_spec];
836 i++;
837 goto nocopy_fmt;
838 }
839
840 if (fmt[i + 1] == 'B') {
841 if (tmp_buf) {
842 err = snprintf(tmp_buf,
843 (tmp_buf_end - tmp_buf),
844 "%pB",
845 (void *)(long)raw_args[num_spec]);
846 tmp_buf += (err + 1);
847 }
848
849 i++;
850 num_spec++;
851 continue;
852 }
853
854
855 if ((fmt[i + 1] != 'i' && fmt[i + 1] != 'I') ||
856 (fmt[i + 2] != '4' && fmt[i + 2] != '6')) {
857 err = -EINVAL;
858 goto out;
859 }
860
861 i += 2;
862 if (!tmp_buf)
863 goto nocopy_fmt;
864
865 sizeof_cur_ip = (fmt[i] == '4') ? 4 : 16;
866 if (tmp_buf_end - tmp_buf < sizeof_cur_ip) {
867 err = -ENOSPC;
868 goto out;
869 }
870
871 unsafe_ptr = (char *)(long)raw_args[num_spec];
872 err = copy_from_kernel_nofault(cur_ip, unsafe_ptr,
873 sizeof_cur_ip);
874 if (err < 0)
875 memset(cur_ip, 0, sizeof_cur_ip);
876
877
878
879
880
881 ip_spec[2] = fmt[i - 1];
882 ip_spec[3] = fmt[i];
883 err = snprintf(tmp_buf, tmp_buf_end - tmp_buf,
884 ip_spec, &cur_ip);
885
886 tmp_buf += err + 1;
887 num_spec++;
888
889 continue;
890 } else if (fmt[i] == 's') {
891 fmt_ptype = fmt[i];
892fmt_str:
893 if (fmt[i + 1] != 0 &&
894 !isspace(fmt[i + 1]) &&
895 !ispunct(fmt[i + 1])) {
896 err = -EINVAL;
897 goto out;
898 }
899
900 if (!tmp_buf)
901 goto nocopy_fmt;
902
903 if (tmp_buf_end == tmp_buf) {
904 err = -ENOSPC;
905 goto out;
906 }
907
908 unsafe_ptr = (char *)(long)raw_args[num_spec];
909 err = bpf_trace_copy_string(tmp_buf, unsafe_ptr,
910 fmt_ptype,
911 tmp_buf_end - tmp_buf);
912 if (err < 0) {
913 tmp_buf[0] = '\0';
914 err = 1;
915 }
916
917 tmp_buf += err;
918 num_spec++;
919
920 continue;
921 } else if (fmt[i] == 'c') {
922 if (!tmp_buf)
923 goto nocopy_fmt;
924
925 if (tmp_buf_end == tmp_buf) {
926 err = -ENOSPC;
927 goto out;
928 }
929
930 *tmp_buf = raw_args[num_spec];
931 tmp_buf++;
932 num_spec++;
933
934 continue;
935 }
936
937 sizeof_cur_arg = sizeof(int);
938
939 if (fmt[i] == 'l') {
940 sizeof_cur_arg = sizeof(long);
941 i++;
942 }
943 if (fmt[i] == 'l') {
944 sizeof_cur_arg = sizeof(long long);
945 i++;
946 }
947
948 if (fmt[i] != 'i' && fmt[i] != 'd' && fmt[i] != 'u' &&
949 fmt[i] != 'x' && fmt[i] != 'X') {
950 err = -EINVAL;
951 goto out;
952 }
953
954 if (tmp_buf)
955 cur_arg = raw_args[num_spec];
956nocopy_fmt:
957 if (tmp_buf) {
958 tmp_buf = PTR_ALIGN(tmp_buf, sizeof(u32));
959 if (tmp_buf_end - tmp_buf < sizeof_cur_arg) {
960 err = -ENOSPC;
961 goto out;
962 }
963
964 if (sizeof_cur_arg == 8) {
965 *(u32 *)tmp_buf = *(u32 *)&cur_arg;
966 *(u32 *)(tmp_buf + 4) = *((u32 *)&cur_arg + 1);
967 } else {
968 *(u32 *)tmp_buf = (u32)(long)cur_arg;
969 }
970 tmp_buf += sizeof_cur_arg;
971 }
972 num_spec++;
973 }
974
975 err = 0;
976out:
977 if (err)
978 bpf_bprintf_cleanup();
979 return err;
980}
981
982BPF_CALL_5(bpf_snprintf, char *, str, u32, str_size, char *, fmt,
983 const void *, data, u32, data_len)
984{
985 int err, num_args;
986 u32 *bin_args;
987
988 if (data_len % 8 || data_len > MAX_BPRINTF_VARARGS * 8 ||
989 (data_len && !data))
990 return -EINVAL;
991 num_args = data_len / 8;
992
993
994
995
996 err = bpf_bprintf_prepare(fmt, UINT_MAX, data, &bin_args, num_args);
997 if (err < 0)
998 return err;
999
1000 err = bstr_printf(str, str_size, fmt, bin_args);
1001
1002 bpf_bprintf_cleanup();
1003
1004 return err + 1;
1005}
1006
1007const struct bpf_func_proto bpf_snprintf_proto = {
1008 .func = bpf_snprintf,
1009 .gpl_only = true,
1010 .ret_type = RET_INTEGER,
1011 .arg1_type = ARG_PTR_TO_MEM_OR_NULL,
1012 .arg2_type = ARG_CONST_SIZE_OR_ZERO,
1013 .arg3_type = ARG_PTR_TO_CONST_STR,
1014 .arg4_type = ARG_PTR_TO_MEM_OR_NULL,
1015 .arg5_type = ARG_CONST_SIZE_OR_ZERO,
1016};
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034struct bpf_hrtimer {
1035 struct hrtimer timer;
1036 struct bpf_map *map;
1037 struct bpf_prog *prog;
1038 void __rcu *callback_fn;
1039 void *value;
1040};
1041
1042
1043struct bpf_timer_kern {
1044 struct bpf_hrtimer *timer;
1045
1046
1047
1048
1049 struct bpf_spin_lock lock;
1050} __attribute__((aligned(8)));
1051
1052static DEFINE_PER_CPU(struct bpf_hrtimer *, hrtimer_running);
1053
1054static enum hrtimer_restart bpf_timer_cb(struct hrtimer *hrtimer)
1055{
1056 struct bpf_hrtimer *t = container_of(hrtimer, struct bpf_hrtimer, timer);
1057 struct bpf_map *map = t->map;
1058 void *value = t->value;
1059 bpf_callback_t callback_fn;
1060 void *key;
1061 u32 idx;
1062
1063 callback_fn = rcu_dereference_check(t->callback_fn, rcu_read_lock_bh_held());
1064 if (!callback_fn)
1065 goto out;
1066
1067
1068
1069
1070
1071
1072
1073 this_cpu_write(hrtimer_running, t);
1074 if (map->map_type == BPF_MAP_TYPE_ARRAY) {
1075 struct bpf_array *array = container_of(map, struct bpf_array, map);
1076
1077
1078 idx = ((char *)value - array->value) / array->elem_size;
1079 key = &idx;
1080 } else {
1081 key = value - round_up(map->key_size, 8);
1082 }
1083
1084 callback_fn((u64)(long)map, (u64)(long)key, (u64)(long)value, 0, 0);
1085
1086
1087 this_cpu_write(hrtimer_running, NULL);
1088out:
1089 return HRTIMER_NORESTART;
1090}
1091
1092BPF_CALL_3(bpf_timer_init, struct bpf_timer_kern *, timer, struct bpf_map *, map,
1093 u64, flags)
1094{
1095 clockid_t clockid = flags & (MAX_CLOCKS - 1);
1096 struct bpf_hrtimer *t;
1097 int ret = 0;
1098
1099 BUILD_BUG_ON(MAX_CLOCKS != 16);
1100 BUILD_BUG_ON(sizeof(struct bpf_timer_kern) > sizeof(struct bpf_timer));
1101 BUILD_BUG_ON(__alignof__(struct bpf_timer_kern) != __alignof__(struct bpf_timer));
1102
1103 if (in_nmi())
1104 return -EOPNOTSUPP;
1105
1106 if (flags >= MAX_CLOCKS ||
1107
1108 (clockid != CLOCK_MONOTONIC &&
1109 clockid != CLOCK_REALTIME &&
1110 clockid != CLOCK_BOOTTIME))
1111 return -EINVAL;
1112 __bpf_spin_lock_irqsave(&timer->lock);
1113 t = timer->timer;
1114 if (t) {
1115 ret = -EBUSY;
1116 goto out;
1117 }
1118 if (!atomic64_read(&map->usercnt)) {
1119
1120
1121
1122 ret = -EPERM;
1123 goto out;
1124 }
1125
1126 t = bpf_map_kmalloc_node(map, sizeof(*t), GFP_ATOMIC, map->numa_node);
1127 if (!t) {
1128 ret = -ENOMEM;
1129 goto out;
1130 }
1131 t->value = (void *)timer - map->timer_off;
1132 t->map = map;
1133 t->prog = NULL;
1134 rcu_assign_pointer(t->callback_fn, NULL);
1135 hrtimer_init(&t->timer, clockid, HRTIMER_MODE_REL_SOFT);
1136 t->timer.function = bpf_timer_cb;
1137 timer->timer = t;
1138out:
1139 __bpf_spin_unlock_irqrestore(&timer->lock);
1140 return ret;
1141}
1142
1143static const struct bpf_func_proto bpf_timer_init_proto = {
1144 .func = bpf_timer_init,
1145 .gpl_only = true,
1146 .ret_type = RET_INTEGER,
1147 .arg1_type = ARG_PTR_TO_TIMER,
1148 .arg2_type = ARG_CONST_MAP_PTR,
1149 .arg3_type = ARG_ANYTHING,
1150};
1151
1152BPF_CALL_3(bpf_timer_set_callback, struct bpf_timer_kern *, timer, void *, callback_fn,
1153 struct bpf_prog_aux *, aux)
1154{
1155 struct bpf_prog *prev, *prog = aux->prog;
1156 struct bpf_hrtimer *t;
1157 int ret = 0;
1158
1159 if (in_nmi())
1160 return -EOPNOTSUPP;
1161 __bpf_spin_lock_irqsave(&timer->lock);
1162 t = timer->timer;
1163 if (!t) {
1164 ret = -EINVAL;
1165 goto out;
1166 }
1167 if (!atomic64_read(&t->map->usercnt)) {
1168
1169
1170
1171
1172
1173 ret = -EPERM;
1174 goto out;
1175 }
1176 prev = t->prog;
1177 if (prev != prog) {
1178
1179
1180
1181 prog = bpf_prog_inc_not_zero(prog);
1182 if (IS_ERR(prog)) {
1183 ret = PTR_ERR(prog);
1184 goto out;
1185 }
1186 if (prev)
1187
1188 bpf_prog_put(prev);
1189 t->prog = prog;
1190 }
1191 rcu_assign_pointer(t->callback_fn, callback_fn);
1192out:
1193 __bpf_spin_unlock_irqrestore(&timer->lock);
1194 return ret;
1195}
1196
1197static const struct bpf_func_proto bpf_timer_set_callback_proto = {
1198 .func = bpf_timer_set_callback,
1199 .gpl_only = true,
1200 .ret_type = RET_INTEGER,
1201 .arg1_type = ARG_PTR_TO_TIMER,
1202 .arg2_type = ARG_PTR_TO_FUNC,
1203};
1204
1205BPF_CALL_3(bpf_timer_start, struct bpf_timer_kern *, timer, u64, nsecs, u64, flags)
1206{
1207 struct bpf_hrtimer *t;
1208 int ret = 0;
1209
1210 if (in_nmi())
1211 return -EOPNOTSUPP;
1212 if (flags)
1213 return -EINVAL;
1214 __bpf_spin_lock_irqsave(&timer->lock);
1215 t = timer->timer;
1216 if (!t || !t->prog) {
1217 ret = -EINVAL;
1218 goto out;
1219 }
1220 hrtimer_start(&t->timer, ns_to_ktime(nsecs), HRTIMER_MODE_REL_SOFT);
1221out:
1222 __bpf_spin_unlock_irqrestore(&timer->lock);
1223 return ret;
1224}
1225
1226static const struct bpf_func_proto bpf_timer_start_proto = {
1227 .func = bpf_timer_start,
1228 .gpl_only = true,
1229 .ret_type = RET_INTEGER,
1230 .arg1_type = ARG_PTR_TO_TIMER,
1231 .arg2_type = ARG_ANYTHING,
1232 .arg3_type = ARG_ANYTHING,
1233};
1234
1235static void drop_prog_refcnt(struct bpf_hrtimer *t)
1236{
1237 struct bpf_prog *prog = t->prog;
1238
1239 if (prog) {
1240 bpf_prog_put(prog);
1241 t->prog = NULL;
1242 rcu_assign_pointer(t->callback_fn, NULL);
1243 }
1244}
1245
1246BPF_CALL_1(bpf_timer_cancel, struct bpf_timer_kern *, timer)
1247{
1248 struct bpf_hrtimer *t;
1249 int ret = 0;
1250
1251 if (in_nmi())
1252 return -EOPNOTSUPP;
1253 __bpf_spin_lock_irqsave(&timer->lock);
1254 t = timer->timer;
1255 if (!t) {
1256 ret = -EINVAL;
1257 goto out;
1258 }
1259 if (this_cpu_read(hrtimer_running) == t) {
1260
1261
1262
1263
1264 ret = -EDEADLK;
1265 goto out;
1266 }
1267 drop_prog_refcnt(t);
1268out:
1269 __bpf_spin_unlock_irqrestore(&timer->lock);
1270
1271
1272
1273 ret = ret ?: hrtimer_cancel(&t->timer);
1274 return ret;
1275}
1276
1277static const struct bpf_func_proto bpf_timer_cancel_proto = {
1278 .func = bpf_timer_cancel,
1279 .gpl_only = true,
1280 .ret_type = RET_INTEGER,
1281 .arg1_type = ARG_PTR_TO_TIMER,
1282};
1283
1284
1285
1286
1287void bpf_timer_cancel_and_free(void *val)
1288{
1289 struct bpf_timer_kern *timer = val;
1290 struct bpf_hrtimer *t;
1291
1292
1293 if (!READ_ONCE(timer->timer))
1294 return;
1295
1296 __bpf_spin_lock_irqsave(&timer->lock);
1297
1298 t = timer->timer;
1299 if (!t)
1300 goto out;
1301 drop_prog_refcnt(t);
1302
1303
1304
1305 timer->timer = NULL;
1306out:
1307 __bpf_spin_unlock_irqrestore(&timer->lock);
1308 if (!t)
1309 return;
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326 if (this_cpu_read(hrtimer_running) != t)
1327 hrtimer_cancel(&t->timer);
1328 kfree(t);
1329}
1330
1331const struct bpf_func_proto bpf_get_current_task_proto __weak;
1332const struct bpf_func_proto bpf_get_current_task_btf_proto __weak;
1333const struct bpf_func_proto bpf_probe_read_user_proto __weak;
1334const struct bpf_func_proto bpf_probe_read_user_str_proto __weak;
1335const struct bpf_func_proto bpf_probe_read_kernel_proto __weak;
1336const struct bpf_func_proto bpf_probe_read_kernel_str_proto __weak;
1337const struct bpf_func_proto bpf_task_pt_regs_proto __weak;
1338
1339const struct bpf_func_proto *
1340bpf_base_func_proto(enum bpf_func_id func_id)
1341{
1342 switch (func_id) {
1343 case BPF_FUNC_map_lookup_elem:
1344 return &bpf_map_lookup_elem_proto;
1345 case BPF_FUNC_map_update_elem:
1346 return &bpf_map_update_elem_proto;
1347 case BPF_FUNC_map_delete_elem:
1348 return &bpf_map_delete_elem_proto;
1349 case BPF_FUNC_map_push_elem:
1350 return &bpf_map_push_elem_proto;
1351 case BPF_FUNC_map_pop_elem:
1352 return &bpf_map_pop_elem_proto;
1353 case BPF_FUNC_map_peek_elem:
1354 return &bpf_map_peek_elem_proto;
1355 case BPF_FUNC_get_prandom_u32:
1356 return &bpf_get_prandom_u32_proto;
1357 case BPF_FUNC_get_smp_processor_id:
1358 return &bpf_get_raw_smp_processor_id_proto;
1359 case BPF_FUNC_get_numa_node_id:
1360 return &bpf_get_numa_node_id_proto;
1361 case BPF_FUNC_tail_call:
1362 return &bpf_tail_call_proto;
1363 case BPF_FUNC_ktime_get_ns:
1364 return &bpf_ktime_get_ns_proto;
1365 case BPF_FUNC_ktime_get_boot_ns:
1366 return &bpf_ktime_get_boot_ns_proto;
1367 case BPF_FUNC_ringbuf_output:
1368 return &bpf_ringbuf_output_proto;
1369 case BPF_FUNC_ringbuf_reserve:
1370 return &bpf_ringbuf_reserve_proto;
1371 case BPF_FUNC_ringbuf_submit:
1372 return &bpf_ringbuf_submit_proto;
1373 case BPF_FUNC_ringbuf_discard:
1374 return &bpf_ringbuf_discard_proto;
1375 case BPF_FUNC_ringbuf_query:
1376 return &bpf_ringbuf_query_proto;
1377 case BPF_FUNC_for_each_map_elem:
1378 return &bpf_for_each_map_elem_proto;
1379 default:
1380 break;
1381 }
1382
1383 if (!bpf_capable())
1384 return NULL;
1385
1386 switch (func_id) {
1387 case BPF_FUNC_spin_lock:
1388 return &bpf_spin_lock_proto;
1389 case BPF_FUNC_spin_unlock:
1390 return &bpf_spin_unlock_proto;
1391 case BPF_FUNC_jiffies64:
1392 return &bpf_jiffies64_proto;
1393 case BPF_FUNC_per_cpu_ptr:
1394 return &bpf_per_cpu_ptr_proto;
1395 case BPF_FUNC_this_cpu_ptr:
1396 return &bpf_this_cpu_ptr_proto;
1397 case BPF_FUNC_timer_init:
1398 return &bpf_timer_init_proto;
1399 case BPF_FUNC_timer_set_callback:
1400 return &bpf_timer_set_callback_proto;
1401 case BPF_FUNC_timer_start:
1402 return &bpf_timer_start_proto;
1403 case BPF_FUNC_timer_cancel:
1404 return &bpf_timer_cancel_proto;
1405 default:
1406 break;
1407 }
1408
1409 if (!perfmon_capable())
1410 return NULL;
1411
1412 switch (func_id) {
1413 case BPF_FUNC_trace_printk:
1414 return bpf_get_trace_printk_proto();
1415 case BPF_FUNC_get_current_task:
1416 return &bpf_get_current_task_proto;
1417 case BPF_FUNC_get_current_task_btf:
1418 return &bpf_get_current_task_btf_proto;
1419 case BPF_FUNC_probe_read_user:
1420 return &bpf_probe_read_user_proto;
1421 case BPF_FUNC_probe_read_kernel:
1422 return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ?
1423 NULL : &bpf_probe_read_kernel_proto;
1424 case BPF_FUNC_probe_read_user_str:
1425 return &bpf_probe_read_user_str_proto;
1426 case BPF_FUNC_probe_read_kernel_str:
1427 return security_locked_down(LOCKDOWN_BPF_READ_KERNEL) < 0 ?
1428 NULL : &bpf_probe_read_kernel_str_proto;
1429 case BPF_FUNC_snprintf_btf:
1430 return &bpf_snprintf_btf_proto;
1431 case BPF_FUNC_snprintf:
1432 return &bpf_snprintf_proto;
1433 case BPF_FUNC_task_pt_regs:
1434 return &bpf_task_pt_regs_proto;
1435 case BPF_FUNC_trace_vprintk:
1436 return bpf_get_trace_vprintk_proto();
1437 default:
1438 return NULL;
1439 }
1440}
1441