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1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2017 Facebook
3 */
4#include <linux/bpf.h>
5#include <linux/btf_ids.h>
6#include <linux/slab.h>
7#include <linux/vmalloc.h>
8#include <linux/etherdevice.h>
9#include <linux/filter.h>
10#include <linux/rcupdate_trace.h>
11#include <linux/sched/signal.h>
12#include <net/bpf_sk_storage.h>
13#include <net/sock.h>
14#include <net/tcp.h>
15#include <net/net_namespace.h>
16#include <linux/error-injection.h>
17#include <linux/smp.h>
18#include <linux/sock_diag.h>
19
20#define CREATE_TRACE_POINTS
21#include <trace/events/bpf_test_run.h>
22
23struct bpf_test_timer {
24 enum { NO_PREEMPT, NO_MIGRATE } mode;
25 u32 i;
26 u64 time_start, time_spent;
27};
28
29static void bpf_test_timer_enter(struct bpf_test_timer *t)
30 __acquires(rcu)
31{
32 rcu_read_lock();
33 if (t->mode == NO_PREEMPT)
34 preempt_disable();
35 else
36 migrate_disable();
37
38 t->time_start = ktime_get_ns();
39}
40
41static void bpf_test_timer_leave(struct bpf_test_timer *t)
42 __releases(rcu)
43{
44 t->time_start = 0;
45
46 if (t->mode == NO_PREEMPT)
47 preempt_enable();
48 else
49 migrate_enable();
50 rcu_read_unlock();
51}
52
53static bool bpf_test_timer_continue(struct bpf_test_timer *t, u32 repeat, int *err, u32 *duration)
54 __must_hold(rcu)
55{
56 t->i++;
57 if (t->i >= repeat) {
58 /* We're done. */
59 t->time_spent += ktime_get_ns() - t->time_start;
60 do_div(t->time_spent, t->i);
61 *duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent;
62 *err = 0;
63 goto reset;
64 }
65
66 if (signal_pending(current)) {
67 /* During iteration: we've been cancelled, abort. */
68 *err = -EINTR;
69 goto reset;
70 }
71
72 if (need_resched()) {
73 /* During iteration: we need to reschedule between runs. */
74 t->time_spent += ktime_get_ns() - t->time_start;
75 bpf_test_timer_leave(t);
76 cond_resched();
77 bpf_test_timer_enter(t);
78 }
79
80 /* Do another round. */
81 return true;
82
83reset:
84 t->i = 0;
85 return false;
86}
87
88static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
89 u32 *retval, u32 *time, bool xdp)
90{
91 struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { NULL };
92 struct bpf_test_timer t = { NO_MIGRATE };
93 enum bpf_cgroup_storage_type stype;
94 int ret;
95
96 for_each_cgroup_storage_type(stype) {
97 storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
98 if (IS_ERR(storage[stype])) {
99 storage[stype] = NULL;
100 for_each_cgroup_storage_type(stype)
101 bpf_cgroup_storage_free(storage[stype]);
102 return -ENOMEM;
103 }
104 }
105
106 if (!repeat)
107 repeat = 1;
108
109 bpf_test_timer_enter(&t);
110 do {
111 ret = bpf_cgroup_storage_set(storage);
112 if (ret)
113 break;
114
115 if (xdp)
116 *retval = bpf_prog_run_xdp(prog, ctx);
117 else
118 *retval = BPF_PROG_RUN(prog, ctx);
119
120 bpf_cgroup_storage_unset();
121 } while (bpf_test_timer_continue(&t, repeat, &ret, time));
122 bpf_test_timer_leave(&t);
123
124 for_each_cgroup_storage_type(stype)
125 bpf_cgroup_storage_free(storage[stype]);
126
127 return ret;
128}
129
130static int bpf_test_finish(const union bpf_attr *kattr,
131 union bpf_attr __user *uattr, const void *data,
132 u32 size, u32 retval, u32 duration)
133{
134 void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
135 int err = -EFAULT;
136 u32 copy_size = size;
137
138 /* Clamp copy if the user has provided a size hint, but copy the full
139 * buffer if not to retain old behaviour.
140 */
141 if (kattr->test.data_size_out &&
142 copy_size > kattr->test.data_size_out) {
143 copy_size = kattr->test.data_size_out;
144 err = -ENOSPC;
145 }
146
147 if (data_out && copy_to_user(data_out, data, copy_size))
148 goto out;
149 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
150 goto out;
151 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
152 goto out;
153 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
154 goto out;
155 if (err != -ENOSPC)
156 err = 0;
157out:
158 trace_bpf_test_finish(&err);
159 return err;
160}
161
162/* Integer types of various sizes and pointer combinations cover variety of
163 * architecture dependent calling conventions. 7+ can be supported in the
164 * future.
165 */
166__diag_push();
167__diag_ignore(GCC, 8, "-Wmissing-prototypes",
168 "Global functions as their definitions will be in vmlinux BTF");
169int noinline bpf_fentry_test1(int a)
170{
171 return a + 1;
172}
173
174int noinline bpf_fentry_test2(int a, u64 b)
175{
176 return a + b;
177}
178
179int noinline bpf_fentry_test3(char a, int b, u64 c)
180{
181 return a + b + c;
182}
183
184int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
185{
186 return (long)a + b + c + d;
187}
188
189int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
190{
191 return a + (long)b + c + d + e;
192}
193
194int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
195{
196 return a + (long)b + c + d + (long)e + f;
197}
198
199struct bpf_fentry_test_t {
200 struct bpf_fentry_test_t *a;
201};
202
203int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
204{
205 return (long)arg;
206}
207
208int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
209{
210 return (long)arg->a;
211}
212
213int noinline bpf_modify_return_test(int a, int *b)
214{
215 *b += 1;
216 return a + *b;
217}
218
219u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d)
220{
221 return a + b + c + d;
222}
223
224int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b)
225{
226 return a + b;
227}
228
229struct sock * noinline bpf_kfunc_call_test3(struct sock *sk)
230{
231 return sk;
232}
233
234__diag_pop();
235
236ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);
237
238BTF_SET_START(test_sk_kfunc_ids)
239BTF_ID(func, bpf_kfunc_call_test1)
240BTF_ID(func, bpf_kfunc_call_test2)
241BTF_ID(func, bpf_kfunc_call_test3)
242BTF_SET_END(test_sk_kfunc_ids)
243
244bool bpf_prog_test_check_kfunc_call(u32 kfunc_id)
245{
246 return btf_id_set_contains(&test_sk_kfunc_ids, kfunc_id);
247}
248
249static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
250 u32 headroom, u32 tailroom)
251{
252 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
253 u32 user_size = kattr->test.data_size_in;
254 void *data;
255
256 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
257 return ERR_PTR(-EINVAL);
258
259 if (user_size > size)
260 return ERR_PTR(-EMSGSIZE);
261
262 data = kzalloc(size + headroom + tailroom, GFP_USER);
263 if (!data)
264 return ERR_PTR(-ENOMEM);
265
266 if (copy_from_user(data + headroom, data_in, user_size)) {
267 kfree(data);
268 return ERR_PTR(-EFAULT);
269 }
270
271 return data;
272}
273
274int bpf_prog_test_run_tracing(struct bpf_prog *prog,
275 const union bpf_attr *kattr,
276 union bpf_attr __user *uattr)
277{
278 struct bpf_fentry_test_t arg = {};
279 u16 side_effect = 0, ret = 0;
280 int b = 2, err = -EFAULT;
281 u32 retval = 0;
282
283 if (kattr->test.flags || kattr->test.cpu)
284 return -EINVAL;
285
286 switch (prog->expected_attach_type) {
287 case BPF_TRACE_FENTRY:
288 case BPF_TRACE_FEXIT:
289 if (bpf_fentry_test1(1) != 2 ||
290 bpf_fentry_test2(2, 3) != 5 ||
291 bpf_fentry_test3(4, 5, 6) != 15 ||
292 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
293 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
294 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
295 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
296 bpf_fentry_test8(&arg) != 0)
297 goto out;
298 break;
299 case BPF_MODIFY_RETURN:
300 ret = bpf_modify_return_test(1, &b);
301 if (b != 2)
302 side_effect = 1;
303 break;
304 default:
305 goto out;
306 }
307
308 retval = ((u32)side_effect << 16) | ret;
309 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
310 goto out;
311
312 err = 0;
313out:
314 trace_bpf_test_finish(&err);
315 return err;
316}
317
318struct bpf_raw_tp_test_run_info {
319 struct bpf_prog *prog;
320 void *ctx;
321 u32 retval;
322};
323
324static void
325__bpf_prog_test_run_raw_tp(void *data)
326{
327 struct bpf_raw_tp_test_run_info *info = data;
328
329 rcu_read_lock();
330 info->retval = BPF_PROG_RUN(info->prog, info->ctx);
331 rcu_read_unlock();
332}
333
334int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
335 const union bpf_attr *kattr,
336 union bpf_attr __user *uattr)
337{
338 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
339 __u32 ctx_size_in = kattr->test.ctx_size_in;
340 struct bpf_raw_tp_test_run_info info;
341 int cpu = kattr->test.cpu, err = 0;
342 int current_cpu;
343
344 /* doesn't support data_in/out, ctx_out, duration, or repeat */
345 if (kattr->test.data_in || kattr->test.data_out ||
346 kattr->test.ctx_out || kattr->test.duration ||
347 kattr->test.repeat)
348 return -EINVAL;
349
350 if (ctx_size_in < prog->aux->max_ctx_offset ||
351 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
352 return -EINVAL;
353
354 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
355 return -EINVAL;
356
357 if (ctx_size_in) {
358 info.ctx = kzalloc(ctx_size_in, GFP_USER);
359 if (!info.ctx)
360 return -ENOMEM;
361 if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) {
362 err = -EFAULT;
363 goto out;
364 }
365 } else {
366 info.ctx = NULL;
367 }
368
369 info.prog = prog;
370
371 current_cpu = get_cpu();
372 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 ||
373 cpu == current_cpu) {
374 __bpf_prog_test_run_raw_tp(&info);
375 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
376 /* smp_call_function_single() also checks cpu_online()
377 * after csd_lock(). However, since cpu is from user
378 * space, let's do an extra quick check to filter out
379 * invalid value before smp_call_function_single().
380 */
381 err = -ENXIO;
382 } else {
383 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
384 &info, 1);
385 }
386 put_cpu();
387
388 if (!err &&
389 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
390 err = -EFAULT;
391
392out:
393 kfree(info.ctx);
394 return err;
395}
396
397static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
398{
399 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
400 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
401 u32 size = kattr->test.ctx_size_in;
402 void *data;
403 int err;
404
405 if (!data_in && !data_out)
406 return NULL;
407
408 data = kzalloc(max_size, GFP_USER);
409 if (!data)
410 return ERR_PTR(-ENOMEM);
411
412 if (data_in) {
413 err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size);
414 if (err) {
415 kfree(data);
416 return ERR_PTR(err);
417 }
418
419 size = min_t(u32, max_size, size);
420 if (copy_from_user(data, data_in, size)) {
421 kfree(data);
422 return ERR_PTR(-EFAULT);
423 }
424 }
425 return data;
426}
427
428static int bpf_ctx_finish(const union bpf_attr *kattr,
429 union bpf_attr __user *uattr, const void *data,
430 u32 size)
431{
432 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
433 int err = -EFAULT;
434 u32 copy_size = size;
435
436 if (!data || !data_out)
437 return 0;
438
439 if (copy_size > kattr->test.ctx_size_out) {
440 copy_size = kattr->test.ctx_size_out;
441 err = -ENOSPC;
442 }
443
444 if (copy_to_user(data_out, data, copy_size))
445 goto out;
446 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
447 goto out;
448 if (err != -ENOSPC)
449 err = 0;
450out:
451 return err;
452}
453
454/**
455 * range_is_zero - test whether buffer is initialized
456 * @buf: buffer to check
457 * @from: check from this position
458 * @to: check up until (excluding) this position
459 *
460 * This function returns true if the there is a non-zero byte
461 * in the buf in the range [from,to).
462 */
463static inline bool range_is_zero(void *buf, size_t from, size_t to)
464{
465 return !memchr_inv((u8 *)buf + from, 0, to - from);
466}
467
468static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
469{
470 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
471
472 if (!__skb)
473 return 0;
474
475 /* make sure the fields we don't use are zeroed */
476 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
477 return -EINVAL;
478
479 /* mark is allowed */
480
481 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
482 offsetof(struct __sk_buff, priority)))
483 return -EINVAL;
484
485 /* priority is allowed */
486
487 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, priority),
488 offsetof(struct __sk_buff, ifindex)))
489 return -EINVAL;
490
491 /* ifindex is allowed */
492
493 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
494 offsetof(struct __sk_buff, cb)))
495 return -EINVAL;
496
497 /* cb is allowed */
498
499 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
500 offsetof(struct __sk_buff, tstamp)))
501 return -EINVAL;
502
503 /* tstamp is allowed */
504 /* wire_len is allowed */
505 /* gso_segs is allowed */
506
507 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
508 offsetof(struct __sk_buff, gso_size)))
509 return -EINVAL;
510
511 /* gso_size is allowed */
512
513 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
514 sizeof(struct __sk_buff)))
515 return -EINVAL;
516
517 skb->mark = __skb->mark;
518 skb->priority = __skb->priority;
519 skb->tstamp = __skb->tstamp;
520 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
521
522 if (__skb->wire_len == 0) {
523 cb->pkt_len = skb->len;
524 } else {
525 if (__skb->wire_len < skb->len ||
526 __skb->wire_len > GSO_MAX_SIZE)
527 return -EINVAL;
528 cb->pkt_len = __skb->wire_len;
529 }
530
531 if (__skb->gso_segs > GSO_MAX_SEGS)
532 return -EINVAL;
533 skb_shinfo(skb)->gso_segs = __skb->gso_segs;
534 skb_shinfo(skb)->gso_size = __skb->gso_size;
535
536 return 0;
537}
538
539static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
540{
541 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
542
543 if (!__skb)
544 return;
545
546 __skb->mark = skb->mark;
547 __skb->priority = skb->priority;
548 __skb->ifindex = skb->dev->ifindex;
549 __skb->tstamp = skb->tstamp;
550 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
551 __skb->wire_len = cb->pkt_len;
552 __skb->gso_segs = skb_shinfo(skb)->gso_segs;
553}
554
555static struct proto bpf_dummy_proto = {
556 .name = "bpf_dummy",
557 .owner = THIS_MODULE,
558 .obj_size = sizeof(struct sock),
559};
560
561int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
562 union bpf_attr __user *uattr)
563{
564 bool is_l2 = false, is_direct_pkt_access = false;
565 struct net *net = current->nsproxy->net_ns;
566 struct net_device *dev = net->loopback_dev;
567 u32 size = kattr->test.data_size_in;
568 u32 repeat = kattr->test.repeat;
569 struct __sk_buff *ctx = NULL;
570 u32 retval, duration;
571 int hh_len = ETH_HLEN;
572 struct sk_buff *skb;
573 struct sock *sk;
574 void *data;
575 int ret;
576
577 if (kattr->test.flags || kattr->test.cpu)
578 return -EINVAL;
579
580 data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
581 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
582 if (IS_ERR(data))
583 return PTR_ERR(data);
584
585 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
586 if (IS_ERR(ctx)) {
587 kfree(data);
588 return PTR_ERR(ctx);
589 }
590
591 switch (prog->type) {
592 case BPF_PROG_TYPE_SCHED_CLS:
593 case BPF_PROG_TYPE_SCHED_ACT:
594 is_l2 = true;
595 fallthrough;
596 case BPF_PROG_TYPE_LWT_IN:
597 case BPF_PROG_TYPE_LWT_OUT:
598 case BPF_PROG_TYPE_LWT_XMIT:
599 is_direct_pkt_access = true;
600 break;
601 default:
602 break;
603 }
604
605 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
606 if (!sk) {
607 kfree(data);
608 kfree(ctx);
609 return -ENOMEM;
610 }
611 sock_init_data(NULL, sk);
612
613 skb = build_skb(data, 0);
614 if (!skb) {
615 kfree(data);
616 kfree(ctx);
617 sk_free(sk);
618 return -ENOMEM;
619 }
620 skb->sk = sk;
621
622 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
623 __skb_put(skb, size);
624 if (ctx && ctx->ifindex > 1) {
625 dev = dev_get_by_index(net, ctx->ifindex);
626 if (!dev) {
627 ret = -ENODEV;
628 goto out;
629 }
630 }
631 skb->protocol = eth_type_trans(skb, dev);
632 skb_reset_network_header(skb);
633
634 switch (skb->protocol) {
635 case htons(ETH_P_IP):
636 sk->sk_family = AF_INET;
637 if (sizeof(struct iphdr) <= skb_headlen(skb)) {
638 sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
639 sk->sk_daddr = ip_hdr(skb)->daddr;
640 }
641 break;
642#if IS_ENABLED(CONFIG_IPV6)
643 case htons(ETH_P_IPV6):
644 sk->sk_family = AF_INET6;
645 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
646 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
647 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
648 }
649 break;
650#endif
651 default:
652 break;
653 }
654
655 if (is_l2)
656 __skb_push(skb, hh_len);
657 if (is_direct_pkt_access)
658 bpf_compute_data_pointers(skb);
659 ret = convert___skb_to_skb(skb, ctx);
660 if (ret)
661 goto out;
662 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
663 if (ret)
664 goto out;
665 if (!is_l2) {
666 if (skb_headroom(skb) < hh_len) {
667 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
668
669 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
670 ret = -ENOMEM;
671 goto out;
672 }
673 }
674 memset(__skb_push(skb, hh_len), 0, hh_len);
675 }
676 convert_skb_to___skb(skb, ctx);
677
678 size = skb->len;
679 /* bpf program can never convert linear skb to non-linear */
680 if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
681 size = skb_headlen(skb);
682 ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
683 if (!ret)
684 ret = bpf_ctx_finish(kattr, uattr, ctx,
685 sizeof(struct __sk_buff));
686out:
687 if (dev && dev != net->loopback_dev)
688 dev_put(dev);
689 kfree_skb(skb);
690 sk_free(sk);
691 kfree(ctx);
692 return ret;
693}
694
695int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
696 union bpf_attr __user *uattr)
697{
698 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
699 u32 headroom = XDP_PACKET_HEADROOM;
700 u32 size = kattr->test.data_size_in;
701 u32 repeat = kattr->test.repeat;
702 struct netdev_rx_queue *rxqueue;
703 struct xdp_buff xdp = {};
704 u32 retval, duration;
705 u32 max_data_sz;
706 void *data;
707 int ret;
708
709 if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
710 prog->expected_attach_type == BPF_XDP_CPUMAP)
711 return -EINVAL;
712 if (kattr->test.ctx_in || kattr->test.ctx_out)
713 return -EINVAL;
714
715 /* XDP have extra tailroom as (most) drivers use full page */
716 max_data_sz = 4096 - headroom - tailroom;
717
718 data = bpf_test_init(kattr, max_data_sz, headroom, tailroom);
719 if (IS_ERR(data))
720 return PTR_ERR(data);
721
722 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
723 xdp_init_buff(&xdp, headroom + max_data_sz + tailroom,
724 &rxqueue->xdp_rxq);
725 xdp_prepare_buff(&xdp, data, headroom, size, true);
726
727 bpf_prog_change_xdp(NULL, prog);
728 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
729 if (ret)
730 goto out;
731 if (xdp.data != data + headroom || xdp.data_end != xdp.data + size)
732 size = xdp.data_end - xdp.data;
733 ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
734out:
735 bpf_prog_change_xdp(prog, NULL);
736 kfree(data);
737 return ret;
738}
739
740static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
741{
742 /* make sure the fields we don't use are zeroed */
743 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
744 return -EINVAL;
745
746 /* flags is allowed */
747
748 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
749 sizeof(struct bpf_flow_keys)))
750 return -EINVAL;
751
752 return 0;
753}
754
755int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
756 const union bpf_attr *kattr,
757 union bpf_attr __user *uattr)
758{
759 struct bpf_test_timer t = { NO_PREEMPT };
760 u32 size = kattr->test.data_size_in;
761 struct bpf_flow_dissector ctx = {};
762 u32 repeat = kattr->test.repeat;
763 struct bpf_flow_keys *user_ctx;
764 struct bpf_flow_keys flow_keys;
765 const struct ethhdr *eth;
766 unsigned int flags = 0;
767 u32 retval, duration;
768 void *data;
769 int ret;
770
771 if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR)
772 return -EINVAL;
773
774 if (kattr->test.flags || kattr->test.cpu)
775 return -EINVAL;
776
777 if (size < ETH_HLEN)
778 return -EINVAL;
779
780 data = bpf_test_init(kattr, size, 0, 0);
781 if (IS_ERR(data))
782 return PTR_ERR(data);
783
784 eth = (struct ethhdr *)data;
785
786 if (!repeat)
787 repeat = 1;
788
789 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
790 if (IS_ERR(user_ctx)) {
791 kfree(data);
792 return PTR_ERR(user_ctx);
793 }
794 if (user_ctx) {
795 ret = verify_user_bpf_flow_keys(user_ctx);
796 if (ret)
797 goto out;
798 flags = user_ctx->flags;
799 }
800
801 ctx.flow_keys = &flow_keys;
802 ctx.data = data;
803 ctx.data_end = (__u8 *)data + size;
804
805 bpf_test_timer_enter(&t);
806 do {
807 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
808 size, flags);
809 } while (bpf_test_timer_continue(&t, repeat, &ret, &duration));
810 bpf_test_timer_leave(&t);
811
812 if (ret < 0)
813 goto out;
814
815 ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
816 retval, duration);
817 if (!ret)
818 ret = bpf_ctx_finish(kattr, uattr, user_ctx,
819 sizeof(struct bpf_flow_keys));
820
821out:
822 kfree(user_ctx);
823 kfree(data);
824 return ret;
825}
826
827int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr,
828 union bpf_attr __user *uattr)
829{
830 struct bpf_test_timer t = { NO_PREEMPT };
831 struct bpf_prog_array *progs = NULL;
832 struct bpf_sk_lookup_kern ctx = {};
833 u32 repeat = kattr->test.repeat;
834 struct bpf_sk_lookup *user_ctx;
835 u32 retval, duration;
836 int ret = -EINVAL;
837
838 if (prog->type != BPF_PROG_TYPE_SK_LOOKUP)
839 return -EINVAL;
840
841 if (kattr->test.flags || kattr->test.cpu)
842 return -EINVAL;
843
844 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out ||
845 kattr->test.data_size_out)
846 return -EINVAL;
847
848 if (!repeat)
849 repeat = 1;
850
851 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx));
852 if (IS_ERR(user_ctx))
853 return PTR_ERR(user_ctx);
854
855 if (!user_ctx)
856 return -EINVAL;
857
858 if (user_ctx->sk)
859 goto out;
860
861 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx)))
862 goto out;
863
864 if (user_ctx->local_port > U16_MAX || user_ctx->remote_port > U16_MAX) {
865 ret = -ERANGE;
866 goto out;
867 }
868
869 ctx.family = (u16)user_ctx->family;
870 ctx.protocol = (u16)user_ctx->protocol;
871 ctx.dport = (u16)user_ctx->local_port;
872 ctx.sport = (__force __be16)user_ctx->remote_port;
873
874 switch (ctx.family) {
875 case AF_INET:
876 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4;
877 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4;
878 break;
879
880#if IS_ENABLED(CONFIG_IPV6)
881 case AF_INET6:
882 ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6;
883 ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6;
884 break;
885#endif
886
887 default:
888 ret = -EAFNOSUPPORT;
889 goto out;
890 }
891
892 progs = bpf_prog_array_alloc(1, GFP_KERNEL);
893 if (!progs) {
894 ret = -ENOMEM;
895 goto out;
896 }
897
898 progs->items[0].prog = prog;
899
900 bpf_test_timer_enter(&t);
901 do {
902 ctx.selected_sk = NULL;
903 retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, BPF_PROG_RUN);
904 } while (bpf_test_timer_continue(&t, repeat, &ret, &duration));
905 bpf_test_timer_leave(&t);
906
907 if (ret < 0)
908 goto out;
909
910 user_ctx->cookie = 0;
911 if (ctx.selected_sk) {
912 if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) {
913 ret = -EOPNOTSUPP;
914 goto out;
915 }
916
917 user_ctx->cookie = sock_gen_cookie(ctx.selected_sk);
918 }
919
920 ret = bpf_test_finish(kattr, uattr, NULL, 0, retval, duration);
921 if (!ret)
922 ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx));
923
924out:
925 bpf_prog_array_free(progs);
926 kfree(user_ctx);
927 return ret;
928}
929
930int bpf_prog_test_run_syscall(struct bpf_prog *prog,
931 const union bpf_attr *kattr,
932 union bpf_attr __user *uattr)
933{
934 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
935 __u32 ctx_size_in = kattr->test.ctx_size_in;
936 void *ctx = NULL;
937 u32 retval;
938 int err = 0;
939
940 /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */
941 if (kattr->test.data_in || kattr->test.data_out ||
942 kattr->test.ctx_out || kattr->test.duration ||
943 kattr->test.repeat || kattr->test.flags)
944 return -EINVAL;
945
946 if (ctx_size_in < prog->aux->max_ctx_offset ||
947 ctx_size_in > U16_MAX)
948 return -EINVAL;
949
950 if (ctx_size_in) {
951 ctx = kzalloc(ctx_size_in, GFP_USER);
952 if (!ctx)
953 return -ENOMEM;
954 if (copy_from_user(ctx, ctx_in, ctx_size_in)) {
955 err = -EFAULT;
956 goto out;
957 }
958 }
959
960 rcu_read_lock_trace();
961 retval = bpf_prog_run_pin_on_cpu(prog, ctx);
962 rcu_read_unlock_trace();
963
964 if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) {
965 err = -EFAULT;
966 goto out;
967 }
968 if (ctx_size_in)
969 if (copy_to_user(ctx_in, ctx, ctx_size_in))
970 err = -EFAULT;
971out:
972 kfree(ctx);
973 return err;
974}
1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2017 Facebook
3 */
4#include <linux/bpf.h>
5#include <linux/btf.h>
6#include <linux/btf_ids.h>
7#include <linux/slab.h>
8#include <linux/init.h>
9#include <linux/vmalloc.h>
10#include <linux/etherdevice.h>
11#include <linux/filter.h>
12#include <linux/rcupdate_trace.h>
13#include <linux/sched/signal.h>
14#include <net/bpf_sk_storage.h>
15#include <net/sock.h>
16#include <net/tcp.h>
17#include <net/net_namespace.h>
18#include <net/page_pool.h>
19#include <linux/error-injection.h>
20#include <linux/smp.h>
21#include <linux/sock_diag.h>
22#include <net/xdp.h>
23
24#define CREATE_TRACE_POINTS
25#include <trace/events/bpf_test_run.h>
26
27struct bpf_test_timer {
28 enum { NO_PREEMPT, NO_MIGRATE } mode;
29 u32 i;
30 u64 time_start, time_spent;
31};
32
33static void bpf_test_timer_enter(struct bpf_test_timer *t)
34 __acquires(rcu)
35{
36 rcu_read_lock();
37 if (t->mode == NO_PREEMPT)
38 preempt_disable();
39 else
40 migrate_disable();
41
42 t->time_start = ktime_get_ns();
43}
44
45static void bpf_test_timer_leave(struct bpf_test_timer *t)
46 __releases(rcu)
47{
48 t->time_start = 0;
49
50 if (t->mode == NO_PREEMPT)
51 preempt_enable();
52 else
53 migrate_enable();
54 rcu_read_unlock();
55}
56
57static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iterations,
58 u32 repeat, int *err, u32 *duration)
59 __must_hold(rcu)
60{
61 t->i += iterations;
62 if (t->i >= repeat) {
63 /* We're done. */
64 t->time_spent += ktime_get_ns() - t->time_start;
65 do_div(t->time_spent, t->i);
66 *duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent;
67 *err = 0;
68 goto reset;
69 }
70
71 if (signal_pending(current)) {
72 /* During iteration: we've been cancelled, abort. */
73 *err = -EINTR;
74 goto reset;
75 }
76
77 if (need_resched()) {
78 /* During iteration: we need to reschedule between runs. */
79 t->time_spent += ktime_get_ns() - t->time_start;
80 bpf_test_timer_leave(t);
81 cond_resched();
82 bpf_test_timer_enter(t);
83 }
84
85 /* Do another round. */
86 return true;
87
88reset:
89 t->i = 0;
90 return false;
91}
92
93/* We put this struct at the head of each page with a context and frame
94 * initialised when the page is allocated, so we don't have to do this on each
95 * repetition of the test run.
96 */
97struct xdp_page_head {
98 struct xdp_buff orig_ctx;
99 struct xdp_buff ctx;
100 struct xdp_frame frm;
101 u8 data[];
102};
103
104struct xdp_test_data {
105 struct xdp_buff *orig_ctx;
106 struct xdp_rxq_info rxq;
107 struct net_device *dev;
108 struct page_pool *pp;
109 struct xdp_frame **frames;
110 struct sk_buff **skbs;
111 struct xdp_mem_info mem;
112 u32 batch_size;
113 u32 frame_cnt;
114};
115
116#define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head))
117#define TEST_XDP_MAX_BATCH 256
118
119static void xdp_test_run_init_page(struct page *page, void *arg)
120{
121 struct xdp_page_head *head = phys_to_virt(page_to_phys(page));
122 struct xdp_buff *new_ctx, *orig_ctx;
123 u32 headroom = XDP_PACKET_HEADROOM;
124 struct xdp_test_data *xdp = arg;
125 size_t frm_len, meta_len;
126 struct xdp_frame *frm;
127 void *data;
128
129 orig_ctx = xdp->orig_ctx;
130 frm_len = orig_ctx->data_end - orig_ctx->data_meta;
131 meta_len = orig_ctx->data - orig_ctx->data_meta;
132 headroom -= meta_len;
133
134 new_ctx = &head->ctx;
135 frm = &head->frm;
136 data = &head->data;
137 memcpy(data + headroom, orig_ctx->data_meta, frm_len);
138
139 xdp_init_buff(new_ctx, TEST_XDP_FRAME_SIZE, &xdp->rxq);
140 xdp_prepare_buff(new_ctx, data, headroom, frm_len, true);
141 new_ctx->data = new_ctx->data_meta + meta_len;
142
143 xdp_update_frame_from_buff(new_ctx, frm);
144 frm->mem = new_ctx->rxq->mem;
145
146 memcpy(&head->orig_ctx, new_ctx, sizeof(head->orig_ctx));
147}
148
149static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_ctx)
150{
151 struct page_pool *pp;
152 int err = -ENOMEM;
153 struct page_pool_params pp_params = {
154 .order = 0,
155 .flags = 0,
156 .pool_size = xdp->batch_size,
157 .nid = NUMA_NO_NODE,
158 .init_callback = xdp_test_run_init_page,
159 .init_arg = xdp,
160 };
161
162 xdp->frames = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
163 if (!xdp->frames)
164 return -ENOMEM;
165
166 xdp->skbs = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
167 if (!xdp->skbs)
168 goto err_skbs;
169
170 pp = page_pool_create(&pp_params);
171 if (IS_ERR(pp)) {
172 err = PTR_ERR(pp);
173 goto err_pp;
174 }
175
176 /* will copy 'mem.id' into pp->xdp_mem_id */
177 err = xdp_reg_mem_model(&xdp->mem, MEM_TYPE_PAGE_POOL, pp);
178 if (err)
179 goto err_mmodel;
180
181 xdp->pp = pp;
182
183 /* We create a 'fake' RXQ referencing the original dev, but with an
184 * xdp_mem_info pointing to our page_pool
185 */
186 xdp_rxq_info_reg(&xdp->rxq, orig_ctx->rxq->dev, 0, 0);
187 xdp->rxq.mem.type = MEM_TYPE_PAGE_POOL;
188 xdp->rxq.mem.id = pp->xdp_mem_id;
189 xdp->dev = orig_ctx->rxq->dev;
190 xdp->orig_ctx = orig_ctx;
191
192 return 0;
193
194err_mmodel:
195 page_pool_destroy(pp);
196err_pp:
197 kvfree(xdp->skbs);
198err_skbs:
199 kvfree(xdp->frames);
200 return err;
201}
202
203static void xdp_test_run_teardown(struct xdp_test_data *xdp)
204{
205 xdp_unreg_mem_model(&xdp->mem);
206 page_pool_destroy(xdp->pp);
207 kfree(xdp->frames);
208 kfree(xdp->skbs);
209}
210
211static bool ctx_was_changed(struct xdp_page_head *head)
212{
213 return head->orig_ctx.data != head->ctx.data ||
214 head->orig_ctx.data_meta != head->ctx.data_meta ||
215 head->orig_ctx.data_end != head->ctx.data_end;
216}
217
218static void reset_ctx(struct xdp_page_head *head)
219{
220 if (likely(!ctx_was_changed(head)))
221 return;
222
223 head->ctx.data = head->orig_ctx.data;
224 head->ctx.data_meta = head->orig_ctx.data_meta;
225 head->ctx.data_end = head->orig_ctx.data_end;
226 xdp_update_frame_from_buff(&head->ctx, &head->frm);
227}
228
229static int xdp_recv_frames(struct xdp_frame **frames, int nframes,
230 struct sk_buff **skbs,
231 struct net_device *dev)
232{
233 gfp_t gfp = __GFP_ZERO | GFP_ATOMIC;
234 int i, n;
235 LIST_HEAD(list);
236
237 n = kmem_cache_alloc_bulk(skbuff_head_cache, gfp, nframes, (void **)skbs);
238 if (unlikely(n == 0)) {
239 for (i = 0; i < nframes; i++)
240 xdp_return_frame(frames[i]);
241 return -ENOMEM;
242 }
243
244 for (i = 0; i < nframes; i++) {
245 struct xdp_frame *xdpf = frames[i];
246 struct sk_buff *skb = skbs[i];
247
248 skb = __xdp_build_skb_from_frame(xdpf, skb, dev);
249 if (!skb) {
250 xdp_return_frame(xdpf);
251 continue;
252 }
253
254 list_add_tail(&skb->list, &list);
255 }
256 netif_receive_skb_list(&list);
257
258 return 0;
259}
260
261static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog *prog,
262 u32 repeat)
263{
264 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
265 int err = 0, act, ret, i, nframes = 0, batch_sz;
266 struct xdp_frame **frames = xdp->frames;
267 struct xdp_page_head *head;
268 struct xdp_frame *frm;
269 bool redirect = false;
270 struct xdp_buff *ctx;
271 struct page *page;
272
273 batch_sz = min_t(u32, repeat, xdp->batch_size);
274
275 local_bh_disable();
276 xdp_set_return_frame_no_direct();
277
278 for (i = 0; i < batch_sz; i++) {
279 page = page_pool_dev_alloc_pages(xdp->pp);
280 if (!page) {
281 err = -ENOMEM;
282 goto out;
283 }
284
285 head = phys_to_virt(page_to_phys(page));
286 reset_ctx(head);
287 ctx = &head->ctx;
288 frm = &head->frm;
289 xdp->frame_cnt++;
290
291 act = bpf_prog_run_xdp(prog, ctx);
292
293 /* if program changed pkt bounds we need to update the xdp_frame */
294 if (unlikely(ctx_was_changed(head))) {
295 ret = xdp_update_frame_from_buff(ctx, frm);
296 if (ret) {
297 xdp_return_buff(ctx);
298 continue;
299 }
300 }
301
302 switch (act) {
303 case XDP_TX:
304 /* we can't do a real XDP_TX since we're not in the
305 * driver, so turn it into a REDIRECT back to the same
306 * index
307 */
308 ri->tgt_index = xdp->dev->ifindex;
309 ri->map_id = INT_MAX;
310 ri->map_type = BPF_MAP_TYPE_UNSPEC;
311 fallthrough;
312 case XDP_REDIRECT:
313 redirect = true;
314 ret = xdp_do_redirect_frame(xdp->dev, ctx, frm, prog);
315 if (ret)
316 xdp_return_buff(ctx);
317 break;
318 case XDP_PASS:
319 frames[nframes++] = frm;
320 break;
321 default:
322 bpf_warn_invalid_xdp_action(NULL, prog, act);
323 fallthrough;
324 case XDP_DROP:
325 xdp_return_buff(ctx);
326 break;
327 }
328 }
329
330out:
331 if (redirect)
332 xdp_do_flush();
333 if (nframes) {
334 ret = xdp_recv_frames(frames, nframes, xdp->skbs, xdp->dev);
335 if (ret)
336 err = ret;
337 }
338
339 xdp_clear_return_frame_no_direct();
340 local_bh_enable();
341 return err;
342}
343
344static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx,
345 u32 repeat, u32 batch_size, u32 *time)
346
347{
348 struct xdp_test_data xdp = { .batch_size = batch_size };
349 struct bpf_test_timer t = { .mode = NO_MIGRATE };
350 int ret;
351
352 if (!repeat)
353 repeat = 1;
354
355 ret = xdp_test_run_setup(&xdp, ctx);
356 if (ret)
357 return ret;
358
359 bpf_test_timer_enter(&t);
360 do {
361 xdp.frame_cnt = 0;
362 ret = xdp_test_run_batch(&xdp, prog, repeat - t.i);
363 if (unlikely(ret < 0))
364 break;
365 } while (bpf_test_timer_continue(&t, xdp.frame_cnt, repeat, &ret, time));
366 bpf_test_timer_leave(&t);
367
368 xdp_test_run_teardown(&xdp);
369 return ret;
370}
371
372static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
373 u32 *retval, u32 *time, bool xdp)
374{
375 struct bpf_prog_array_item item = {.prog = prog};
376 struct bpf_run_ctx *old_ctx;
377 struct bpf_cg_run_ctx run_ctx;
378 struct bpf_test_timer t = { NO_MIGRATE };
379 enum bpf_cgroup_storage_type stype;
380 int ret;
381
382 for_each_cgroup_storage_type(stype) {
383 item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
384 if (IS_ERR(item.cgroup_storage[stype])) {
385 item.cgroup_storage[stype] = NULL;
386 for_each_cgroup_storage_type(stype)
387 bpf_cgroup_storage_free(item.cgroup_storage[stype]);
388 return -ENOMEM;
389 }
390 }
391
392 if (!repeat)
393 repeat = 1;
394
395 bpf_test_timer_enter(&t);
396 old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
397 do {
398 run_ctx.prog_item = &item;
399 if (xdp)
400 *retval = bpf_prog_run_xdp(prog, ctx);
401 else
402 *retval = bpf_prog_run(prog, ctx);
403 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, time));
404 bpf_reset_run_ctx(old_ctx);
405 bpf_test_timer_leave(&t);
406
407 for_each_cgroup_storage_type(stype)
408 bpf_cgroup_storage_free(item.cgroup_storage[stype]);
409
410 return ret;
411}
412
413static int bpf_test_finish(const union bpf_attr *kattr,
414 union bpf_attr __user *uattr, const void *data,
415 struct skb_shared_info *sinfo, u32 size,
416 u32 retval, u32 duration)
417{
418 void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
419 int err = -EFAULT;
420 u32 copy_size = size;
421
422 /* Clamp copy if the user has provided a size hint, but copy the full
423 * buffer if not to retain old behaviour.
424 */
425 if (kattr->test.data_size_out &&
426 copy_size > kattr->test.data_size_out) {
427 copy_size = kattr->test.data_size_out;
428 err = -ENOSPC;
429 }
430
431 if (data_out) {
432 int len = sinfo ? copy_size - sinfo->xdp_frags_size : copy_size;
433
434 if (len < 0) {
435 err = -ENOSPC;
436 goto out;
437 }
438
439 if (copy_to_user(data_out, data, len))
440 goto out;
441
442 if (sinfo) {
443 int i, offset = len;
444 u32 data_len;
445
446 for (i = 0; i < sinfo->nr_frags; i++) {
447 skb_frag_t *frag = &sinfo->frags[i];
448
449 if (offset >= copy_size) {
450 err = -ENOSPC;
451 break;
452 }
453
454 data_len = min_t(u32, copy_size - offset,
455 skb_frag_size(frag));
456
457 if (copy_to_user(data_out + offset,
458 skb_frag_address(frag),
459 data_len))
460 goto out;
461
462 offset += data_len;
463 }
464 }
465 }
466
467 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
468 goto out;
469 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
470 goto out;
471 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
472 goto out;
473 if (err != -ENOSPC)
474 err = 0;
475out:
476 trace_bpf_test_finish(&err);
477 return err;
478}
479
480/* Integer types of various sizes and pointer combinations cover variety of
481 * architecture dependent calling conventions. 7+ can be supported in the
482 * future.
483 */
484__diag_push();
485__diag_ignore_all("-Wmissing-prototypes",
486 "Global functions as their definitions will be in vmlinux BTF");
487int noinline bpf_fentry_test1(int a)
488{
489 return a + 1;
490}
491EXPORT_SYMBOL_GPL(bpf_fentry_test1);
492
493int noinline bpf_fentry_test2(int a, u64 b)
494{
495 return a + b;
496}
497
498int noinline bpf_fentry_test3(char a, int b, u64 c)
499{
500 return a + b + c;
501}
502
503int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
504{
505 return (long)a + b + c + d;
506}
507
508int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
509{
510 return a + (long)b + c + d + e;
511}
512
513int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
514{
515 return a + (long)b + c + d + (long)e + f;
516}
517
518struct bpf_fentry_test_t {
519 struct bpf_fentry_test_t *a;
520};
521
522int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
523{
524 return (long)arg;
525}
526
527int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
528{
529 return (long)arg->a;
530}
531
532int noinline bpf_modify_return_test(int a, int *b)
533{
534 *b += 1;
535 return a + *b;
536}
537
538u64 noinline bpf_kfunc_call_test1(struct sock *sk, u32 a, u64 b, u32 c, u64 d)
539{
540 return a + b + c + d;
541}
542
543int noinline bpf_kfunc_call_test2(struct sock *sk, u32 a, u32 b)
544{
545 return a + b;
546}
547
548struct sock * noinline bpf_kfunc_call_test3(struct sock *sk)
549{
550 return sk;
551}
552
553struct prog_test_member1 {
554 int a;
555};
556
557struct prog_test_member {
558 struct prog_test_member1 m;
559 int c;
560};
561
562struct prog_test_ref_kfunc {
563 int a;
564 int b;
565 struct prog_test_member memb;
566 struct prog_test_ref_kfunc *next;
567 refcount_t cnt;
568};
569
570static struct prog_test_ref_kfunc prog_test_struct = {
571 .a = 42,
572 .b = 108,
573 .next = &prog_test_struct,
574 .cnt = REFCOUNT_INIT(1),
575};
576
577noinline struct prog_test_ref_kfunc *
578bpf_kfunc_call_test_acquire(unsigned long *scalar_ptr)
579{
580 refcount_inc(&prog_test_struct.cnt);
581 return &prog_test_struct;
582}
583
584noinline struct prog_test_member *
585bpf_kfunc_call_memb_acquire(void)
586{
587 WARN_ON_ONCE(1);
588 return NULL;
589}
590
591noinline void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p)
592{
593 if (!p)
594 return;
595
596 refcount_dec(&p->cnt);
597}
598
599noinline void bpf_kfunc_call_memb_release(struct prog_test_member *p)
600{
601}
602
603noinline void bpf_kfunc_call_memb1_release(struct prog_test_member1 *p)
604{
605 WARN_ON_ONCE(1);
606}
607
608static int *__bpf_kfunc_call_test_get_mem(struct prog_test_ref_kfunc *p, const int size)
609{
610 if (size > 2 * sizeof(int))
611 return NULL;
612
613 return (int *)p;
614}
615
616noinline int *bpf_kfunc_call_test_get_rdwr_mem(struct prog_test_ref_kfunc *p, const int rdwr_buf_size)
617{
618 return __bpf_kfunc_call_test_get_mem(p, rdwr_buf_size);
619}
620
621noinline int *bpf_kfunc_call_test_get_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size)
622{
623 return __bpf_kfunc_call_test_get_mem(p, rdonly_buf_size);
624}
625
626/* the next 2 ones can't be really used for testing expect to ensure
627 * that the verifier rejects the call.
628 * Acquire functions must return struct pointers, so these ones are
629 * failing.
630 */
631noinline int *bpf_kfunc_call_test_acq_rdonly_mem(struct prog_test_ref_kfunc *p, const int rdonly_buf_size)
632{
633 return __bpf_kfunc_call_test_get_mem(p, rdonly_buf_size);
634}
635
636noinline void bpf_kfunc_call_int_mem_release(int *p)
637{
638}
639
640noinline struct prog_test_ref_kfunc *
641bpf_kfunc_call_test_kptr_get(struct prog_test_ref_kfunc **pp, int a, int b)
642{
643 struct prog_test_ref_kfunc *p = READ_ONCE(*pp);
644
645 if (!p)
646 return NULL;
647 refcount_inc(&p->cnt);
648 return p;
649}
650
651struct prog_test_pass1 {
652 int x0;
653 struct {
654 int x1;
655 struct {
656 int x2;
657 struct {
658 int x3;
659 };
660 };
661 };
662};
663
664struct prog_test_pass2 {
665 int len;
666 short arr1[4];
667 struct {
668 char arr2[4];
669 unsigned long arr3[8];
670 } x;
671};
672
673struct prog_test_fail1 {
674 void *p;
675 int x;
676};
677
678struct prog_test_fail2 {
679 int x8;
680 struct prog_test_pass1 x;
681};
682
683struct prog_test_fail3 {
684 int len;
685 char arr1[2];
686 char arr2[];
687};
688
689noinline void bpf_kfunc_call_test_pass_ctx(struct __sk_buff *skb)
690{
691}
692
693noinline void bpf_kfunc_call_test_pass1(struct prog_test_pass1 *p)
694{
695}
696
697noinline void bpf_kfunc_call_test_pass2(struct prog_test_pass2 *p)
698{
699}
700
701noinline void bpf_kfunc_call_test_fail1(struct prog_test_fail1 *p)
702{
703}
704
705noinline void bpf_kfunc_call_test_fail2(struct prog_test_fail2 *p)
706{
707}
708
709noinline void bpf_kfunc_call_test_fail3(struct prog_test_fail3 *p)
710{
711}
712
713noinline void bpf_kfunc_call_test_mem_len_pass1(void *mem, int mem__sz)
714{
715}
716
717noinline void bpf_kfunc_call_test_mem_len_fail1(void *mem, int len)
718{
719}
720
721noinline void bpf_kfunc_call_test_mem_len_fail2(u64 *mem, int len)
722{
723}
724
725noinline void bpf_kfunc_call_test_ref(struct prog_test_ref_kfunc *p)
726{
727}
728
729noinline void bpf_kfunc_call_test_destructive(void)
730{
731}
732
733__diag_pop();
734
735BTF_SET8_START(bpf_test_modify_return_ids)
736BTF_ID_FLAGS(func, bpf_modify_return_test)
737BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE)
738BTF_SET8_END(bpf_test_modify_return_ids)
739
740static const struct btf_kfunc_id_set bpf_test_modify_return_set = {
741 .owner = THIS_MODULE,
742 .set = &bpf_test_modify_return_ids,
743};
744
745BTF_SET8_START(test_sk_check_kfunc_ids)
746BTF_ID_FLAGS(func, bpf_kfunc_call_test1)
747BTF_ID_FLAGS(func, bpf_kfunc_call_test2)
748BTF_ID_FLAGS(func, bpf_kfunc_call_test3)
749BTF_ID_FLAGS(func, bpf_kfunc_call_test_acquire, KF_ACQUIRE | KF_RET_NULL)
750BTF_ID_FLAGS(func, bpf_kfunc_call_memb_acquire, KF_ACQUIRE | KF_RET_NULL)
751BTF_ID_FLAGS(func, bpf_kfunc_call_test_release, KF_RELEASE)
752BTF_ID_FLAGS(func, bpf_kfunc_call_memb_release, KF_RELEASE)
753BTF_ID_FLAGS(func, bpf_kfunc_call_memb1_release, KF_RELEASE)
754BTF_ID_FLAGS(func, bpf_kfunc_call_test_get_rdwr_mem, KF_RET_NULL)
755BTF_ID_FLAGS(func, bpf_kfunc_call_test_get_rdonly_mem, KF_RET_NULL)
756BTF_ID_FLAGS(func, bpf_kfunc_call_test_acq_rdonly_mem, KF_ACQUIRE | KF_RET_NULL)
757BTF_ID_FLAGS(func, bpf_kfunc_call_int_mem_release, KF_RELEASE)
758BTF_ID_FLAGS(func, bpf_kfunc_call_test_kptr_get, KF_ACQUIRE | KF_RET_NULL | KF_KPTR_GET)
759BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass_ctx)
760BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass1)
761BTF_ID_FLAGS(func, bpf_kfunc_call_test_pass2)
762BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail1)
763BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail2)
764BTF_ID_FLAGS(func, bpf_kfunc_call_test_fail3)
765BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_pass1)
766BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail1)
767BTF_ID_FLAGS(func, bpf_kfunc_call_test_mem_len_fail2)
768BTF_ID_FLAGS(func, bpf_kfunc_call_test_ref, KF_TRUSTED_ARGS)
769BTF_ID_FLAGS(func, bpf_kfunc_call_test_destructive, KF_DESTRUCTIVE)
770BTF_SET8_END(test_sk_check_kfunc_ids)
771
772static void *bpf_test_init(const union bpf_attr *kattr, u32 user_size,
773 u32 size, u32 headroom, u32 tailroom)
774{
775 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
776 void *data;
777
778 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
779 return ERR_PTR(-EINVAL);
780
781 if (user_size > size)
782 return ERR_PTR(-EMSGSIZE);
783
784 size = SKB_DATA_ALIGN(size);
785 data = kzalloc(size + headroom + tailroom, GFP_USER);
786 if (!data)
787 return ERR_PTR(-ENOMEM);
788
789 if (copy_from_user(data + headroom, data_in, user_size)) {
790 kfree(data);
791 return ERR_PTR(-EFAULT);
792 }
793
794 return data;
795}
796
797int bpf_prog_test_run_tracing(struct bpf_prog *prog,
798 const union bpf_attr *kattr,
799 union bpf_attr __user *uattr)
800{
801 struct bpf_fentry_test_t arg = {};
802 u16 side_effect = 0, ret = 0;
803 int b = 2, err = -EFAULT;
804 u32 retval = 0;
805
806 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
807 return -EINVAL;
808
809 switch (prog->expected_attach_type) {
810 case BPF_TRACE_FENTRY:
811 case BPF_TRACE_FEXIT:
812 if (bpf_fentry_test1(1) != 2 ||
813 bpf_fentry_test2(2, 3) != 5 ||
814 bpf_fentry_test3(4, 5, 6) != 15 ||
815 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
816 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
817 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
818 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
819 bpf_fentry_test8(&arg) != 0)
820 goto out;
821 break;
822 case BPF_MODIFY_RETURN:
823 ret = bpf_modify_return_test(1, &b);
824 if (b != 2)
825 side_effect = 1;
826 break;
827 default:
828 goto out;
829 }
830
831 retval = ((u32)side_effect << 16) | ret;
832 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
833 goto out;
834
835 err = 0;
836out:
837 trace_bpf_test_finish(&err);
838 return err;
839}
840
841struct bpf_raw_tp_test_run_info {
842 struct bpf_prog *prog;
843 void *ctx;
844 u32 retval;
845};
846
847static void
848__bpf_prog_test_run_raw_tp(void *data)
849{
850 struct bpf_raw_tp_test_run_info *info = data;
851
852 rcu_read_lock();
853 info->retval = bpf_prog_run(info->prog, info->ctx);
854 rcu_read_unlock();
855}
856
857int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
858 const union bpf_attr *kattr,
859 union bpf_attr __user *uattr)
860{
861 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
862 __u32 ctx_size_in = kattr->test.ctx_size_in;
863 struct bpf_raw_tp_test_run_info info;
864 int cpu = kattr->test.cpu, err = 0;
865 int current_cpu;
866
867 /* doesn't support data_in/out, ctx_out, duration, or repeat */
868 if (kattr->test.data_in || kattr->test.data_out ||
869 kattr->test.ctx_out || kattr->test.duration ||
870 kattr->test.repeat || kattr->test.batch_size)
871 return -EINVAL;
872
873 if (ctx_size_in < prog->aux->max_ctx_offset ||
874 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
875 return -EINVAL;
876
877 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
878 return -EINVAL;
879
880 if (ctx_size_in) {
881 info.ctx = memdup_user(ctx_in, ctx_size_in);
882 if (IS_ERR(info.ctx))
883 return PTR_ERR(info.ctx);
884 } else {
885 info.ctx = NULL;
886 }
887
888 info.prog = prog;
889
890 current_cpu = get_cpu();
891 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 ||
892 cpu == current_cpu) {
893 __bpf_prog_test_run_raw_tp(&info);
894 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
895 /* smp_call_function_single() also checks cpu_online()
896 * after csd_lock(). However, since cpu is from user
897 * space, let's do an extra quick check to filter out
898 * invalid value before smp_call_function_single().
899 */
900 err = -ENXIO;
901 } else {
902 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
903 &info, 1);
904 }
905 put_cpu();
906
907 if (!err &&
908 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
909 err = -EFAULT;
910
911 kfree(info.ctx);
912 return err;
913}
914
915static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
916{
917 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
918 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
919 u32 size = kattr->test.ctx_size_in;
920 void *data;
921 int err;
922
923 if (!data_in && !data_out)
924 return NULL;
925
926 data = kzalloc(max_size, GFP_USER);
927 if (!data)
928 return ERR_PTR(-ENOMEM);
929
930 if (data_in) {
931 err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size);
932 if (err) {
933 kfree(data);
934 return ERR_PTR(err);
935 }
936
937 size = min_t(u32, max_size, size);
938 if (copy_from_user(data, data_in, size)) {
939 kfree(data);
940 return ERR_PTR(-EFAULT);
941 }
942 }
943 return data;
944}
945
946static int bpf_ctx_finish(const union bpf_attr *kattr,
947 union bpf_attr __user *uattr, const void *data,
948 u32 size)
949{
950 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
951 int err = -EFAULT;
952 u32 copy_size = size;
953
954 if (!data || !data_out)
955 return 0;
956
957 if (copy_size > kattr->test.ctx_size_out) {
958 copy_size = kattr->test.ctx_size_out;
959 err = -ENOSPC;
960 }
961
962 if (copy_to_user(data_out, data, copy_size))
963 goto out;
964 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
965 goto out;
966 if (err != -ENOSPC)
967 err = 0;
968out:
969 return err;
970}
971
972/**
973 * range_is_zero - test whether buffer is initialized
974 * @buf: buffer to check
975 * @from: check from this position
976 * @to: check up until (excluding) this position
977 *
978 * This function returns true if the there is a non-zero byte
979 * in the buf in the range [from,to).
980 */
981static inline bool range_is_zero(void *buf, size_t from, size_t to)
982{
983 return !memchr_inv((u8 *)buf + from, 0, to - from);
984}
985
986static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
987{
988 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
989
990 if (!__skb)
991 return 0;
992
993 /* make sure the fields we don't use are zeroed */
994 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
995 return -EINVAL;
996
997 /* mark is allowed */
998
999 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
1000 offsetof(struct __sk_buff, priority)))
1001 return -EINVAL;
1002
1003 /* priority is allowed */
1004 /* ingress_ifindex is allowed */
1005 /* ifindex is allowed */
1006
1007 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
1008 offsetof(struct __sk_buff, cb)))
1009 return -EINVAL;
1010
1011 /* cb is allowed */
1012
1013 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
1014 offsetof(struct __sk_buff, tstamp)))
1015 return -EINVAL;
1016
1017 /* tstamp is allowed */
1018 /* wire_len is allowed */
1019 /* gso_segs is allowed */
1020
1021 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
1022 offsetof(struct __sk_buff, gso_size)))
1023 return -EINVAL;
1024
1025 /* gso_size is allowed */
1026
1027 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
1028 offsetof(struct __sk_buff, hwtstamp)))
1029 return -EINVAL;
1030
1031 /* hwtstamp is allowed */
1032
1033 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, hwtstamp),
1034 sizeof(struct __sk_buff)))
1035 return -EINVAL;
1036
1037 skb->mark = __skb->mark;
1038 skb->priority = __skb->priority;
1039 skb->skb_iif = __skb->ingress_ifindex;
1040 skb->tstamp = __skb->tstamp;
1041 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
1042
1043 if (__skb->wire_len == 0) {
1044 cb->pkt_len = skb->len;
1045 } else {
1046 if (__skb->wire_len < skb->len ||
1047 __skb->wire_len > GSO_LEGACY_MAX_SIZE)
1048 return -EINVAL;
1049 cb->pkt_len = __skb->wire_len;
1050 }
1051
1052 if (__skb->gso_segs > GSO_MAX_SEGS)
1053 return -EINVAL;
1054 skb_shinfo(skb)->gso_segs = __skb->gso_segs;
1055 skb_shinfo(skb)->gso_size = __skb->gso_size;
1056 skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp;
1057
1058 return 0;
1059}
1060
1061static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
1062{
1063 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
1064
1065 if (!__skb)
1066 return;
1067
1068 __skb->mark = skb->mark;
1069 __skb->priority = skb->priority;
1070 __skb->ingress_ifindex = skb->skb_iif;
1071 __skb->ifindex = skb->dev->ifindex;
1072 __skb->tstamp = skb->tstamp;
1073 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
1074 __skb->wire_len = cb->pkt_len;
1075 __skb->gso_segs = skb_shinfo(skb)->gso_segs;
1076 __skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp;
1077}
1078
1079static struct proto bpf_dummy_proto = {
1080 .name = "bpf_dummy",
1081 .owner = THIS_MODULE,
1082 .obj_size = sizeof(struct sock),
1083};
1084
1085int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
1086 union bpf_attr __user *uattr)
1087{
1088 bool is_l2 = false, is_direct_pkt_access = false;
1089 struct net *net = current->nsproxy->net_ns;
1090 struct net_device *dev = net->loopback_dev;
1091 u32 size = kattr->test.data_size_in;
1092 u32 repeat = kattr->test.repeat;
1093 struct __sk_buff *ctx = NULL;
1094 u32 retval, duration;
1095 int hh_len = ETH_HLEN;
1096 struct sk_buff *skb;
1097 struct sock *sk;
1098 void *data;
1099 int ret;
1100
1101 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1102 return -EINVAL;
1103
1104 data = bpf_test_init(kattr, kattr->test.data_size_in,
1105 size, NET_SKB_PAD + NET_IP_ALIGN,
1106 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
1107 if (IS_ERR(data))
1108 return PTR_ERR(data);
1109
1110 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
1111 if (IS_ERR(ctx)) {
1112 kfree(data);
1113 return PTR_ERR(ctx);
1114 }
1115
1116 switch (prog->type) {
1117 case BPF_PROG_TYPE_SCHED_CLS:
1118 case BPF_PROG_TYPE_SCHED_ACT:
1119 is_l2 = true;
1120 fallthrough;
1121 case BPF_PROG_TYPE_LWT_IN:
1122 case BPF_PROG_TYPE_LWT_OUT:
1123 case BPF_PROG_TYPE_LWT_XMIT:
1124 is_direct_pkt_access = true;
1125 break;
1126 default:
1127 break;
1128 }
1129
1130 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
1131 if (!sk) {
1132 kfree(data);
1133 kfree(ctx);
1134 return -ENOMEM;
1135 }
1136 sock_init_data(NULL, sk);
1137
1138 skb = slab_build_skb(data);
1139 if (!skb) {
1140 kfree(data);
1141 kfree(ctx);
1142 sk_free(sk);
1143 return -ENOMEM;
1144 }
1145 skb->sk = sk;
1146
1147 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
1148 __skb_put(skb, size);
1149 if (ctx && ctx->ifindex > 1) {
1150 dev = dev_get_by_index(net, ctx->ifindex);
1151 if (!dev) {
1152 ret = -ENODEV;
1153 goto out;
1154 }
1155 }
1156 skb->protocol = eth_type_trans(skb, dev);
1157 skb_reset_network_header(skb);
1158
1159 switch (skb->protocol) {
1160 case htons(ETH_P_IP):
1161 sk->sk_family = AF_INET;
1162 if (sizeof(struct iphdr) <= skb_headlen(skb)) {
1163 sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
1164 sk->sk_daddr = ip_hdr(skb)->daddr;
1165 }
1166 break;
1167#if IS_ENABLED(CONFIG_IPV6)
1168 case htons(ETH_P_IPV6):
1169 sk->sk_family = AF_INET6;
1170 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
1171 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
1172 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
1173 }
1174 break;
1175#endif
1176 default:
1177 break;
1178 }
1179
1180 if (is_l2)
1181 __skb_push(skb, hh_len);
1182 if (is_direct_pkt_access)
1183 bpf_compute_data_pointers(skb);
1184 ret = convert___skb_to_skb(skb, ctx);
1185 if (ret)
1186 goto out;
1187 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
1188 if (ret)
1189 goto out;
1190 if (!is_l2) {
1191 if (skb_headroom(skb) < hh_len) {
1192 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
1193
1194 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
1195 ret = -ENOMEM;
1196 goto out;
1197 }
1198 }
1199 memset(__skb_push(skb, hh_len), 0, hh_len);
1200 }
1201 convert_skb_to___skb(skb, ctx);
1202
1203 size = skb->len;
1204 /* bpf program can never convert linear skb to non-linear */
1205 if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
1206 size = skb_headlen(skb);
1207 ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval,
1208 duration);
1209 if (!ret)
1210 ret = bpf_ctx_finish(kattr, uattr, ctx,
1211 sizeof(struct __sk_buff));
1212out:
1213 if (dev && dev != net->loopback_dev)
1214 dev_put(dev);
1215 kfree_skb(skb);
1216 sk_free(sk);
1217 kfree(ctx);
1218 return ret;
1219}
1220
1221static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp)
1222{
1223 unsigned int ingress_ifindex, rx_queue_index;
1224 struct netdev_rx_queue *rxqueue;
1225 struct net_device *device;
1226
1227 if (!xdp_md)
1228 return 0;
1229
1230 if (xdp_md->egress_ifindex != 0)
1231 return -EINVAL;
1232
1233 ingress_ifindex = xdp_md->ingress_ifindex;
1234 rx_queue_index = xdp_md->rx_queue_index;
1235
1236 if (!ingress_ifindex && rx_queue_index)
1237 return -EINVAL;
1238
1239 if (ingress_ifindex) {
1240 device = dev_get_by_index(current->nsproxy->net_ns,
1241 ingress_ifindex);
1242 if (!device)
1243 return -ENODEV;
1244
1245 if (rx_queue_index >= device->real_num_rx_queues)
1246 goto free_dev;
1247
1248 rxqueue = __netif_get_rx_queue(device, rx_queue_index);
1249
1250 if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq))
1251 goto free_dev;
1252
1253 xdp->rxq = &rxqueue->xdp_rxq;
1254 /* The device is now tracked in the xdp->rxq for later
1255 * dev_put()
1256 */
1257 }
1258
1259 xdp->data = xdp->data_meta + xdp_md->data;
1260 return 0;
1261
1262free_dev:
1263 dev_put(device);
1264 return -EINVAL;
1265}
1266
1267static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md)
1268{
1269 if (!xdp_md)
1270 return;
1271
1272 xdp_md->data = xdp->data - xdp->data_meta;
1273 xdp_md->data_end = xdp->data_end - xdp->data_meta;
1274
1275 if (xdp_md->ingress_ifindex)
1276 dev_put(xdp->rxq->dev);
1277}
1278
1279int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1280 union bpf_attr __user *uattr)
1281{
1282 bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES);
1283 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1284 u32 batch_size = kattr->test.batch_size;
1285 u32 retval = 0, duration, max_data_sz;
1286 u32 size = kattr->test.data_size_in;
1287 u32 headroom = XDP_PACKET_HEADROOM;
1288 u32 repeat = kattr->test.repeat;
1289 struct netdev_rx_queue *rxqueue;
1290 struct skb_shared_info *sinfo;
1291 struct xdp_buff xdp = {};
1292 int i, ret = -EINVAL;
1293 struct xdp_md *ctx;
1294 void *data;
1295
1296 if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
1297 prog->expected_attach_type == BPF_XDP_CPUMAP)
1298 return -EINVAL;
1299
1300 if (kattr->test.flags & ~BPF_F_TEST_XDP_LIVE_FRAMES)
1301 return -EINVAL;
1302
1303 if (do_live) {
1304 if (!batch_size)
1305 batch_size = NAPI_POLL_WEIGHT;
1306 else if (batch_size > TEST_XDP_MAX_BATCH)
1307 return -E2BIG;
1308
1309 headroom += sizeof(struct xdp_page_head);
1310 } else if (batch_size) {
1311 return -EINVAL;
1312 }
1313
1314 ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md));
1315 if (IS_ERR(ctx))
1316 return PTR_ERR(ctx);
1317
1318 if (ctx) {
1319 /* There can't be user provided data before the meta data */
1320 if (ctx->data_meta || ctx->data_end != size ||
1321 ctx->data > ctx->data_end ||
1322 unlikely(xdp_metalen_invalid(ctx->data)) ||
1323 (do_live && (kattr->test.data_out || kattr->test.ctx_out)))
1324 goto free_ctx;
1325 /* Meta data is allocated from the headroom */
1326 headroom -= ctx->data;
1327 }
1328
1329 max_data_sz = 4096 - headroom - tailroom;
1330 if (size > max_data_sz) {
1331 /* disallow live data mode for jumbo frames */
1332 if (do_live)
1333 goto free_ctx;
1334 size = max_data_sz;
1335 }
1336
1337 data = bpf_test_init(kattr, size, max_data_sz, headroom, tailroom);
1338 if (IS_ERR(data)) {
1339 ret = PTR_ERR(data);
1340 goto free_ctx;
1341 }
1342
1343 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
1344 rxqueue->xdp_rxq.frag_size = headroom + max_data_sz + tailroom;
1345 xdp_init_buff(&xdp, rxqueue->xdp_rxq.frag_size, &rxqueue->xdp_rxq);
1346 xdp_prepare_buff(&xdp, data, headroom, size, true);
1347 sinfo = xdp_get_shared_info_from_buff(&xdp);
1348
1349 ret = xdp_convert_md_to_buff(ctx, &xdp);
1350 if (ret)
1351 goto free_data;
1352
1353 if (unlikely(kattr->test.data_size_in > size)) {
1354 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
1355
1356 while (size < kattr->test.data_size_in) {
1357 struct page *page;
1358 skb_frag_t *frag;
1359 u32 data_len;
1360
1361 if (sinfo->nr_frags == MAX_SKB_FRAGS) {
1362 ret = -ENOMEM;
1363 goto out;
1364 }
1365
1366 page = alloc_page(GFP_KERNEL);
1367 if (!page) {
1368 ret = -ENOMEM;
1369 goto out;
1370 }
1371
1372 frag = &sinfo->frags[sinfo->nr_frags++];
1373 __skb_frag_set_page(frag, page);
1374
1375 data_len = min_t(u32, kattr->test.data_size_in - size,
1376 PAGE_SIZE);
1377 skb_frag_size_set(frag, data_len);
1378
1379 if (copy_from_user(page_address(page), data_in + size,
1380 data_len)) {
1381 ret = -EFAULT;
1382 goto out;
1383 }
1384 sinfo->xdp_frags_size += data_len;
1385 size += data_len;
1386 }
1387 xdp_buff_set_frags_flag(&xdp);
1388 }
1389
1390 if (repeat > 1)
1391 bpf_prog_change_xdp(NULL, prog);
1392
1393 if (do_live)
1394 ret = bpf_test_run_xdp_live(prog, &xdp, repeat, batch_size, &duration);
1395 else
1396 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
1397 /* We convert the xdp_buff back to an xdp_md before checking the return
1398 * code so the reference count of any held netdevice will be decremented
1399 * even if the test run failed.
1400 */
1401 xdp_convert_buff_to_md(&xdp, ctx);
1402 if (ret)
1403 goto out;
1404
1405 size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size;
1406 ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size,
1407 retval, duration);
1408 if (!ret)
1409 ret = bpf_ctx_finish(kattr, uattr, ctx,
1410 sizeof(struct xdp_md));
1411
1412out:
1413 if (repeat > 1)
1414 bpf_prog_change_xdp(prog, NULL);
1415free_data:
1416 for (i = 0; i < sinfo->nr_frags; i++)
1417 __free_page(skb_frag_page(&sinfo->frags[i]));
1418 kfree(data);
1419free_ctx:
1420 kfree(ctx);
1421 return ret;
1422}
1423
1424static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
1425{
1426 /* make sure the fields we don't use are zeroed */
1427 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
1428 return -EINVAL;
1429
1430 /* flags is allowed */
1431
1432 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
1433 sizeof(struct bpf_flow_keys)))
1434 return -EINVAL;
1435
1436 return 0;
1437}
1438
1439int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1440 const union bpf_attr *kattr,
1441 union bpf_attr __user *uattr)
1442{
1443 struct bpf_test_timer t = { NO_PREEMPT };
1444 u32 size = kattr->test.data_size_in;
1445 struct bpf_flow_dissector ctx = {};
1446 u32 repeat = kattr->test.repeat;
1447 struct bpf_flow_keys *user_ctx;
1448 struct bpf_flow_keys flow_keys;
1449 const struct ethhdr *eth;
1450 unsigned int flags = 0;
1451 u32 retval, duration;
1452 void *data;
1453 int ret;
1454
1455 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1456 return -EINVAL;
1457
1458 if (size < ETH_HLEN)
1459 return -EINVAL;
1460
1461 data = bpf_test_init(kattr, kattr->test.data_size_in, size, 0, 0);
1462 if (IS_ERR(data))
1463 return PTR_ERR(data);
1464
1465 eth = (struct ethhdr *)data;
1466
1467 if (!repeat)
1468 repeat = 1;
1469
1470 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
1471 if (IS_ERR(user_ctx)) {
1472 kfree(data);
1473 return PTR_ERR(user_ctx);
1474 }
1475 if (user_ctx) {
1476 ret = verify_user_bpf_flow_keys(user_ctx);
1477 if (ret)
1478 goto out;
1479 flags = user_ctx->flags;
1480 }
1481
1482 ctx.flow_keys = &flow_keys;
1483 ctx.data = data;
1484 ctx.data_end = (__u8 *)data + size;
1485
1486 bpf_test_timer_enter(&t);
1487 do {
1488 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
1489 size, flags);
1490 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
1491 bpf_test_timer_leave(&t);
1492
1493 if (ret < 0)
1494 goto out;
1495
1496 ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL,
1497 sizeof(flow_keys), retval, duration);
1498 if (!ret)
1499 ret = bpf_ctx_finish(kattr, uattr, user_ctx,
1500 sizeof(struct bpf_flow_keys));
1501
1502out:
1503 kfree(user_ctx);
1504 kfree(data);
1505 return ret;
1506}
1507
1508int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr,
1509 union bpf_attr __user *uattr)
1510{
1511 struct bpf_test_timer t = { NO_PREEMPT };
1512 struct bpf_prog_array *progs = NULL;
1513 struct bpf_sk_lookup_kern ctx = {};
1514 u32 repeat = kattr->test.repeat;
1515 struct bpf_sk_lookup *user_ctx;
1516 u32 retval, duration;
1517 int ret = -EINVAL;
1518
1519 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1520 return -EINVAL;
1521
1522 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out ||
1523 kattr->test.data_size_out)
1524 return -EINVAL;
1525
1526 if (!repeat)
1527 repeat = 1;
1528
1529 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx));
1530 if (IS_ERR(user_ctx))
1531 return PTR_ERR(user_ctx);
1532
1533 if (!user_ctx)
1534 return -EINVAL;
1535
1536 if (user_ctx->sk)
1537 goto out;
1538
1539 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx)))
1540 goto out;
1541
1542 if (user_ctx->local_port > U16_MAX) {
1543 ret = -ERANGE;
1544 goto out;
1545 }
1546
1547 ctx.family = (u16)user_ctx->family;
1548 ctx.protocol = (u16)user_ctx->protocol;
1549 ctx.dport = (u16)user_ctx->local_port;
1550 ctx.sport = user_ctx->remote_port;
1551
1552 switch (ctx.family) {
1553 case AF_INET:
1554 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4;
1555 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4;
1556 break;
1557
1558#if IS_ENABLED(CONFIG_IPV6)
1559 case AF_INET6:
1560 ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6;
1561 ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6;
1562 break;
1563#endif
1564
1565 default:
1566 ret = -EAFNOSUPPORT;
1567 goto out;
1568 }
1569
1570 progs = bpf_prog_array_alloc(1, GFP_KERNEL);
1571 if (!progs) {
1572 ret = -ENOMEM;
1573 goto out;
1574 }
1575
1576 progs->items[0].prog = prog;
1577
1578 bpf_test_timer_enter(&t);
1579 do {
1580 ctx.selected_sk = NULL;
1581 retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run);
1582 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
1583 bpf_test_timer_leave(&t);
1584
1585 if (ret < 0)
1586 goto out;
1587
1588 user_ctx->cookie = 0;
1589 if (ctx.selected_sk) {
1590 if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) {
1591 ret = -EOPNOTSUPP;
1592 goto out;
1593 }
1594
1595 user_ctx->cookie = sock_gen_cookie(ctx.selected_sk);
1596 }
1597
1598 ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
1599 if (!ret)
1600 ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx));
1601
1602out:
1603 bpf_prog_array_free(progs);
1604 kfree(user_ctx);
1605 return ret;
1606}
1607
1608int bpf_prog_test_run_syscall(struct bpf_prog *prog,
1609 const union bpf_attr *kattr,
1610 union bpf_attr __user *uattr)
1611{
1612 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
1613 __u32 ctx_size_in = kattr->test.ctx_size_in;
1614 void *ctx = NULL;
1615 u32 retval;
1616 int err = 0;
1617
1618 /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */
1619 if (kattr->test.data_in || kattr->test.data_out ||
1620 kattr->test.ctx_out || kattr->test.duration ||
1621 kattr->test.repeat || kattr->test.flags ||
1622 kattr->test.batch_size)
1623 return -EINVAL;
1624
1625 if (ctx_size_in < prog->aux->max_ctx_offset ||
1626 ctx_size_in > U16_MAX)
1627 return -EINVAL;
1628
1629 if (ctx_size_in) {
1630 ctx = memdup_user(ctx_in, ctx_size_in);
1631 if (IS_ERR(ctx))
1632 return PTR_ERR(ctx);
1633 }
1634
1635 rcu_read_lock_trace();
1636 retval = bpf_prog_run_pin_on_cpu(prog, ctx);
1637 rcu_read_unlock_trace();
1638
1639 if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) {
1640 err = -EFAULT;
1641 goto out;
1642 }
1643 if (ctx_size_in)
1644 if (copy_to_user(ctx_in, ctx, ctx_size_in))
1645 err = -EFAULT;
1646out:
1647 kfree(ctx);
1648 return err;
1649}
1650
1651static const struct btf_kfunc_id_set bpf_prog_test_kfunc_set = {
1652 .owner = THIS_MODULE,
1653 .set = &test_sk_check_kfunc_ids,
1654};
1655
1656BTF_ID_LIST(bpf_prog_test_dtor_kfunc_ids)
1657BTF_ID(struct, prog_test_ref_kfunc)
1658BTF_ID(func, bpf_kfunc_call_test_release)
1659BTF_ID(struct, prog_test_member)
1660BTF_ID(func, bpf_kfunc_call_memb_release)
1661
1662static int __init bpf_prog_test_run_init(void)
1663{
1664 const struct btf_id_dtor_kfunc bpf_prog_test_dtor_kfunc[] = {
1665 {
1666 .btf_id = bpf_prog_test_dtor_kfunc_ids[0],
1667 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[1]
1668 },
1669 {
1670 .btf_id = bpf_prog_test_dtor_kfunc_ids[2],
1671 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[3],
1672 },
1673 };
1674 int ret;
1675
1676 ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set);
1677 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
1678 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set);
1679 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set);
1680 return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,
1681 ARRAY_SIZE(bpf_prog_test_dtor_kfunc),
1682 THIS_MODULE);
1683}
1684late_initcall(bpf_prog_test_run_init);