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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/helpers.h>
19#include <linux/error-injection.h>
20#include <linux/smp.h>
21#include <linux/sock_diag.h>
22#include <linux/netfilter.h>
23#include <net/netdev_rx_queue.h>
24#include <net/xdp.h>
25#include <net/netfilter/nf_bpf_link.h>
26
27#define CREATE_TRACE_POINTS
28#include <trace/events/bpf_test_run.h>
29
30struct bpf_test_timer {
31 enum { NO_PREEMPT, NO_MIGRATE } mode;
32 u32 i;
33 u64 time_start, time_spent;
34};
35
36static void bpf_test_timer_enter(struct bpf_test_timer *t)
37 __acquires(rcu)
38{
39 rcu_read_lock();
40 if (t->mode == NO_PREEMPT)
41 preempt_disable();
42 else
43 migrate_disable();
44
45 t->time_start = ktime_get_ns();
46}
47
48static void bpf_test_timer_leave(struct bpf_test_timer *t)
49 __releases(rcu)
50{
51 t->time_start = 0;
52
53 if (t->mode == NO_PREEMPT)
54 preempt_enable();
55 else
56 migrate_enable();
57 rcu_read_unlock();
58}
59
60static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iterations,
61 u32 repeat, int *err, u32 *duration)
62 __must_hold(rcu)
63{
64 t->i += iterations;
65 if (t->i >= repeat) {
66 /* We're done. */
67 t->time_spent += ktime_get_ns() - t->time_start;
68 do_div(t->time_spent, t->i);
69 *duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent;
70 *err = 0;
71 goto reset;
72 }
73
74 if (signal_pending(current)) {
75 /* During iteration: we've been cancelled, abort. */
76 *err = -EINTR;
77 goto reset;
78 }
79
80 if (need_resched()) {
81 /* During iteration: we need to reschedule between runs. */
82 t->time_spent += ktime_get_ns() - t->time_start;
83 bpf_test_timer_leave(t);
84 cond_resched();
85 bpf_test_timer_enter(t);
86 }
87
88 /* Do another round. */
89 return true;
90
91reset:
92 t->i = 0;
93 return false;
94}
95
96/* We put this struct at the head of each page with a context and frame
97 * initialised when the page is allocated, so we don't have to do this on each
98 * repetition of the test run.
99 */
100struct xdp_page_head {
101 struct xdp_buff orig_ctx;
102 struct xdp_buff ctx;
103 union {
104 /* ::data_hard_start starts here */
105 DECLARE_FLEX_ARRAY(struct xdp_frame, frame);
106 DECLARE_FLEX_ARRAY(u8, data);
107 };
108};
109
110struct xdp_test_data {
111 struct xdp_buff *orig_ctx;
112 struct xdp_rxq_info rxq;
113 struct net_device *dev;
114 struct page_pool *pp;
115 struct xdp_frame **frames;
116 struct sk_buff **skbs;
117 struct xdp_mem_info mem;
118 u32 batch_size;
119 u32 frame_cnt;
120};
121
122/* tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c:%MAX_PKT_SIZE
123 * must be updated accordingly this gets changed, otherwise BPF selftests
124 * will fail.
125 */
126#define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head))
127#define TEST_XDP_MAX_BATCH 256
128
129static void xdp_test_run_init_page(struct page *page, void *arg)
130{
131 struct xdp_page_head *head = phys_to_virt(page_to_phys(page));
132 struct xdp_buff *new_ctx, *orig_ctx;
133 u32 headroom = XDP_PACKET_HEADROOM;
134 struct xdp_test_data *xdp = arg;
135 size_t frm_len, meta_len;
136 struct xdp_frame *frm;
137 void *data;
138
139 orig_ctx = xdp->orig_ctx;
140 frm_len = orig_ctx->data_end - orig_ctx->data_meta;
141 meta_len = orig_ctx->data - orig_ctx->data_meta;
142 headroom -= meta_len;
143
144 new_ctx = &head->ctx;
145 frm = head->frame;
146 data = head->data;
147 memcpy(data + headroom, orig_ctx->data_meta, frm_len);
148
149 xdp_init_buff(new_ctx, TEST_XDP_FRAME_SIZE, &xdp->rxq);
150 xdp_prepare_buff(new_ctx, data, headroom, frm_len, true);
151 new_ctx->data = new_ctx->data_meta + meta_len;
152
153 xdp_update_frame_from_buff(new_ctx, frm);
154 frm->mem = new_ctx->rxq->mem;
155
156 memcpy(&head->orig_ctx, new_ctx, sizeof(head->orig_ctx));
157}
158
159static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_ctx)
160{
161 struct page_pool *pp;
162 int err = -ENOMEM;
163 struct page_pool_params pp_params = {
164 .order = 0,
165 .flags = 0,
166 .pool_size = xdp->batch_size,
167 .nid = NUMA_NO_NODE,
168 .init_callback = xdp_test_run_init_page,
169 .init_arg = xdp,
170 };
171
172 xdp->frames = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
173 if (!xdp->frames)
174 return -ENOMEM;
175
176 xdp->skbs = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
177 if (!xdp->skbs)
178 goto err_skbs;
179
180 pp = page_pool_create(&pp_params);
181 if (IS_ERR(pp)) {
182 err = PTR_ERR(pp);
183 goto err_pp;
184 }
185
186 /* will copy 'mem.id' into pp->xdp_mem_id */
187 err = xdp_reg_mem_model(&xdp->mem, MEM_TYPE_PAGE_POOL, pp);
188 if (err)
189 goto err_mmodel;
190
191 xdp->pp = pp;
192
193 /* We create a 'fake' RXQ referencing the original dev, but with an
194 * xdp_mem_info pointing to our page_pool
195 */
196 xdp_rxq_info_reg(&xdp->rxq, orig_ctx->rxq->dev, 0, 0);
197 xdp->rxq.mem.type = MEM_TYPE_PAGE_POOL;
198 xdp->rxq.mem.id = pp->xdp_mem_id;
199 xdp->dev = orig_ctx->rxq->dev;
200 xdp->orig_ctx = orig_ctx;
201
202 return 0;
203
204err_mmodel:
205 page_pool_destroy(pp);
206err_pp:
207 kvfree(xdp->skbs);
208err_skbs:
209 kvfree(xdp->frames);
210 return err;
211}
212
213static void xdp_test_run_teardown(struct xdp_test_data *xdp)
214{
215 xdp_unreg_mem_model(&xdp->mem);
216 page_pool_destroy(xdp->pp);
217 kfree(xdp->frames);
218 kfree(xdp->skbs);
219}
220
221static bool frame_was_changed(const struct xdp_page_head *head)
222{
223 /* xdp_scrub_frame() zeroes the data pointer, flags is the last field,
224 * i.e. has the highest chances to be overwritten. If those two are
225 * untouched, it's most likely safe to skip the context reset.
226 */
227 return head->frame->data != head->orig_ctx.data ||
228 head->frame->flags != head->orig_ctx.flags;
229}
230
231static bool ctx_was_changed(struct xdp_page_head *head)
232{
233 return head->orig_ctx.data != head->ctx.data ||
234 head->orig_ctx.data_meta != head->ctx.data_meta ||
235 head->orig_ctx.data_end != head->ctx.data_end;
236}
237
238static void reset_ctx(struct xdp_page_head *head)
239{
240 if (likely(!frame_was_changed(head) && !ctx_was_changed(head)))
241 return;
242
243 head->ctx.data = head->orig_ctx.data;
244 head->ctx.data_meta = head->orig_ctx.data_meta;
245 head->ctx.data_end = head->orig_ctx.data_end;
246 xdp_update_frame_from_buff(&head->ctx, head->frame);
247}
248
249static int xdp_recv_frames(struct xdp_frame **frames, int nframes,
250 struct sk_buff **skbs,
251 struct net_device *dev)
252{
253 gfp_t gfp = __GFP_ZERO | GFP_ATOMIC;
254 int i, n;
255 LIST_HEAD(list);
256
257 n = kmem_cache_alloc_bulk(skbuff_cache, gfp, nframes, (void **)skbs);
258 if (unlikely(n == 0)) {
259 for (i = 0; i < nframes; i++)
260 xdp_return_frame(frames[i]);
261 return -ENOMEM;
262 }
263
264 for (i = 0; i < nframes; i++) {
265 struct xdp_frame *xdpf = frames[i];
266 struct sk_buff *skb = skbs[i];
267
268 skb = __xdp_build_skb_from_frame(xdpf, skb, dev);
269 if (!skb) {
270 xdp_return_frame(xdpf);
271 continue;
272 }
273
274 list_add_tail(&skb->list, &list);
275 }
276 netif_receive_skb_list(&list);
277
278 return 0;
279}
280
281static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog *prog,
282 u32 repeat)
283{
284 struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info);
285 int err = 0, act, ret, i, nframes = 0, batch_sz;
286 struct xdp_frame **frames = xdp->frames;
287 struct xdp_page_head *head;
288 struct xdp_frame *frm;
289 bool redirect = false;
290 struct xdp_buff *ctx;
291 struct page *page;
292
293 batch_sz = min_t(u32, repeat, xdp->batch_size);
294
295 local_bh_disable();
296 xdp_set_return_frame_no_direct();
297
298 for (i = 0; i < batch_sz; i++) {
299 page = page_pool_dev_alloc_pages(xdp->pp);
300 if (!page) {
301 err = -ENOMEM;
302 goto out;
303 }
304
305 head = phys_to_virt(page_to_phys(page));
306 reset_ctx(head);
307 ctx = &head->ctx;
308 frm = head->frame;
309 xdp->frame_cnt++;
310
311 act = bpf_prog_run_xdp(prog, ctx);
312
313 /* if program changed pkt bounds we need to update the xdp_frame */
314 if (unlikely(ctx_was_changed(head))) {
315 ret = xdp_update_frame_from_buff(ctx, frm);
316 if (ret) {
317 xdp_return_buff(ctx);
318 continue;
319 }
320 }
321
322 switch (act) {
323 case XDP_TX:
324 /* we can't do a real XDP_TX since we're not in the
325 * driver, so turn it into a REDIRECT back to the same
326 * index
327 */
328 ri->tgt_index = xdp->dev->ifindex;
329 ri->map_id = INT_MAX;
330 ri->map_type = BPF_MAP_TYPE_UNSPEC;
331 fallthrough;
332 case XDP_REDIRECT:
333 redirect = true;
334 ret = xdp_do_redirect_frame(xdp->dev, ctx, frm, prog);
335 if (ret)
336 xdp_return_buff(ctx);
337 break;
338 case XDP_PASS:
339 frames[nframes++] = frm;
340 break;
341 default:
342 bpf_warn_invalid_xdp_action(NULL, prog, act);
343 fallthrough;
344 case XDP_DROP:
345 xdp_return_buff(ctx);
346 break;
347 }
348 }
349
350out:
351 if (redirect)
352 xdp_do_flush();
353 if (nframes) {
354 ret = xdp_recv_frames(frames, nframes, xdp->skbs, xdp->dev);
355 if (ret)
356 err = ret;
357 }
358
359 xdp_clear_return_frame_no_direct();
360 local_bh_enable();
361 return err;
362}
363
364static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx,
365 u32 repeat, u32 batch_size, u32 *time)
366
367{
368 struct xdp_test_data xdp = { .batch_size = batch_size };
369 struct bpf_test_timer t = { .mode = NO_MIGRATE };
370 int ret;
371
372 if (!repeat)
373 repeat = 1;
374
375 ret = xdp_test_run_setup(&xdp, ctx);
376 if (ret)
377 return ret;
378
379 bpf_test_timer_enter(&t);
380 do {
381 xdp.frame_cnt = 0;
382 ret = xdp_test_run_batch(&xdp, prog, repeat - t.i);
383 if (unlikely(ret < 0))
384 break;
385 } while (bpf_test_timer_continue(&t, xdp.frame_cnt, repeat, &ret, time));
386 bpf_test_timer_leave(&t);
387
388 xdp_test_run_teardown(&xdp);
389 return ret;
390}
391
392static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
393 u32 *retval, u32 *time, bool xdp)
394{
395 struct bpf_prog_array_item item = {.prog = prog};
396 struct bpf_run_ctx *old_ctx;
397 struct bpf_cg_run_ctx run_ctx;
398 struct bpf_test_timer t = { NO_MIGRATE };
399 enum bpf_cgroup_storage_type stype;
400 int ret;
401
402 for_each_cgroup_storage_type(stype) {
403 item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
404 if (IS_ERR(item.cgroup_storage[stype])) {
405 item.cgroup_storage[stype] = NULL;
406 for_each_cgroup_storage_type(stype)
407 bpf_cgroup_storage_free(item.cgroup_storage[stype]);
408 return -ENOMEM;
409 }
410 }
411
412 if (!repeat)
413 repeat = 1;
414
415 bpf_test_timer_enter(&t);
416 old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
417 do {
418 run_ctx.prog_item = &item;
419 local_bh_disable();
420 if (xdp)
421 *retval = bpf_prog_run_xdp(prog, ctx);
422 else
423 *retval = bpf_prog_run(prog, ctx);
424 local_bh_enable();
425 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, time));
426 bpf_reset_run_ctx(old_ctx);
427 bpf_test_timer_leave(&t);
428
429 for_each_cgroup_storage_type(stype)
430 bpf_cgroup_storage_free(item.cgroup_storage[stype]);
431
432 return ret;
433}
434
435static int bpf_test_finish(const union bpf_attr *kattr,
436 union bpf_attr __user *uattr, const void *data,
437 struct skb_shared_info *sinfo, u32 size,
438 u32 retval, u32 duration)
439{
440 void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
441 int err = -EFAULT;
442 u32 copy_size = size;
443
444 /* Clamp copy if the user has provided a size hint, but copy the full
445 * buffer if not to retain old behaviour.
446 */
447 if (kattr->test.data_size_out &&
448 copy_size > kattr->test.data_size_out) {
449 copy_size = kattr->test.data_size_out;
450 err = -ENOSPC;
451 }
452
453 if (data_out) {
454 int len = sinfo ? copy_size - sinfo->xdp_frags_size : copy_size;
455
456 if (len < 0) {
457 err = -ENOSPC;
458 goto out;
459 }
460
461 if (copy_to_user(data_out, data, len))
462 goto out;
463
464 if (sinfo) {
465 int i, offset = len;
466 u32 data_len;
467
468 for (i = 0; i < sinfo->nr_frags; i++) {
469 skb_frag_t *frag = &sinfo->frags[i];
470
471 if (offset >= copy_size) {
472 err = -ENOSPC;
473 break;
474 }
475
476 data_len = min_t(u32, copy_size - offset,
477 skb_frag_size(frag));
478
479 if (copy_to_user(data_out + offset,
480 skb_frag_address(frag),
481 data_len))
482 goto out;
483
484 offset += data_len;
485 }
486 }
487 }
488
489 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
490 goto out;
491 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
492 goto out;
493 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
494 goto out;
495 if (err != -ENOSPC)
496 err = 0;
497out:
498 trace_bpf_test_finish(&err);
499 return err;
500}
501
502/* Integer types of various sizes and pointer combinations cover variety of
503 * architecture dependent calling conventions. 7+ can be supported in the
504 * future.
505 */
506__bpf_kfunc_start_defs();
507
508__bpf_kfunc int bpf_fentry_test1(int a)
509{
510 return a + 1;
511}
512EXPORT_SYMBOL_GPL(bpf_fentry_test1);
513
514int noinline bpf_fentry_test2(int a, u64 b)
515{
516 return a + b;
517}
518
519int noinline bpf_fentry_test3(char a, int b, u64 c)
520{
521 return a + b + c;
522}
523
524int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
525{
526 return (long)a + b + c + d;
527}
528
529int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
530{
531 return a + (long)b + c + d + e;
532}
533
534int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
535{
536 return a + (long)b + c + d + (long)e + f;
537}
538
539struct bpf_fentry_test_t {
540 struct bpf_fentry_test_t *a;
541};
542
543int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
544{
545 asm volatile ("": "+r"(arg));
546 return (long)arg;
547}
548
549int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
550{
551 return (long)arg->a;
552}
553
554__bpf_kfunc u32 bpf_fentry_test9(u32 *a)
555{
556 return *a;
557}
558
559void noinline bpf_fentry_test_sinfo(struct skb_shared_info *sinfo)
560{
561}
562
563__bpf_kfunc int bpf_modify_return_test(int a, int *b)
564{
565 *b += 1;
566 return a + *b;
567}
568
569__bpf_kfunc int bpf_modify_return_test2(int a, int *b, short c, int d,
570 void *e, char f, int g)
571{
572 *b += 1;
573 return a + *b + c + d + (long)e + f + g;
574}
575
576int noinline bpf_fentry_shadow_test(int a)
577{
578 return a + 1;
579}
580
581struct prog_test_member1 {
582 int a;
583};
584
585struct prog_test_member {
586 struct prog_test_member1 m;
587 int c;
588};
589
590struct prog_test_ref_kfunc {
591 int a;
592 int b;
593 struct prog_test_member memb;
594 struct prog_test_ref_kfunc *next;
595 refcount_t cnt;
596};
597
598__bpf_kfunc void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p)
599{
600 refcount_dec(&p->cnt);
601}
602
603__bpf_kfunc void bpf_kfunc_call_test_release_dtor(void *p)
604{
605 bpf_kfunc_call_test_release(p);
606}
607CFI_NOSEAL(bpf_kfunc_call_test_release_dtor);
608
609__bpf_kfunc void bpf_kfunc_call_memb_release(struct prog_test_member *p)
610{
611}
612
613__bpf_kfunc void bpf_kfunc_call_memb_release_dtor(void *p)
614{
615}
616CFI_NOSEAL(bpf_kfunc_call_memb_release_dtor);
617
618__bpf_kfunc_end_defs();
619
620BTF_SET8_START(bpf_test_modify_return_ids)
621BTF_ID_FLAGS(func, bpf_modify_return_test)
622BTF_ID_FLAGS(func, bpf_modify_return_test2)
623BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE)
624BTF_SET8_END(bpf_test_modify_return_ids)
625
626static const struct btf_kfunc_id_set bpf_test_modify_return_set = {
627 .owner = THIS_MODULE,
628 .set = &bpf_test_modify_return_ids,
629};
630
631BTF_SET8_START(test_sk_check_kfunc_ids)
632BTF_ID_FLAGS(func, bpf_kfunc_call_test_release, KF_RELEASE)
633BTF_ID_FLAGS(func, bpf_kfunc_call_memb_release, KF_RELEASE)
634BTF_SET8_END(test_sk_check_kfunc_ids)
635
636static void *bpf_test_init(const union bpf_attr *kattr, u32 user_size,
637 u32 size, u32 headroom, u32 tailroom)
638{
639 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
640 void *data;
641
642 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
643 return ERR_PTR(-EINVAL);
644
645 if (user_size > size)
646 return ERR_PTR(-EMSGSIZE);
647
648 size = SKB_DATA_ALIGN(size);
649 data = kzalloc(size + headroom + tailroom, GFP_USER);
650 if (!data)
651 return ERR_PTR(-ENOMEM);
652
653 if (copy_from_user(data + headroom, data_in, user_size)) {
654 kfree(data);
655 return ERR_PTR(-EFAULT);
656 }
657
658 return data;
659}
660
661int bpf_prog_test_run_tracing(struct bpf_prog *prog,
662 const union bpf_attr *kattr,
663 union bpf_attr __user *uattr)
664{
665 struct bpf_fentry_test_t arg = {};
666 u16 side_effect = 0, ret = 0;
667 int b = 2, err = -EFAULT;
668 u32 retval = 0;
669
670 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
671 return -EINVAL;
672
673 switch (prog->expected_attach_type) {
674 case BPF_TRACE_FENTRY:
675 case BPF_TRACE_FEXIT:
676 if (bpf_fentry_test1(1) != 2 ||
677 bpf_fentry_test2(2, 3) != 5 ||
678 bpf_fentry_test3(4, 5, 6) != 15 ||
679 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
680 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
681 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
682 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
683 bpf_fentry_test8(&arg) != 0 ||
684 bpf_fentry_test9(&retval) != 0)
685 goto out;
686 break;
687 case BPF_MODIFY_RETURN:
688 ret = bpf_modify_return_test(1, &b);
689 if (b != 2)
690 side_effect++;
691 b = 2;
692 ret += bpf_modify_return_test2(1, &b, 3, 4, (void *)5, 6, 7);
693 if (b != 2)
694 side_effect++;
695 break;
696 default:
697 goto out;
698 }
699
700 retval = ((u32)side_effect << 16) | ret;
701 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
702 goto out;
703
704 err = 0;
705out:
706 trace_bpf_test_finish(&err);
707 return err;
708}
709
710struct bpf_raw_tp_test_run_info {
711 struct bpf_prog *prog;
712 void *ctx;
713 u32 retval;
714};
715
716static void
717__bpf_prog_test_run_raw_tp(void *data)
718{
719 struct bpf_raw_tp_test_run_info *info = data;
720
721 rcu_read_lock();
722 info->retval = bpf_prog_run(info->prog, info->ctx);
723 rcu_read_unlock();
724}
725
726int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
727 const union bpf_attr *kattr,
728 union bpf_attr __user *uattr)
729{
730 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
731 __u32 ctx_size_in = kattr->test.ctx_size_in;
732 struct bpf_raw_tp_test_run_info info;
733 int cpu = kattr->test.cpu, err = 0;
734 int current_cpu;
735
736 /* doesn't support data_in/out, ctx_out, duration, or repeat */
737 if (kattr->test.data_in || kattr->test.data_out ||
738 kattr->test.ctx_out || kattr->test.duration ||
739 kattr->test.repeat || kattr->test.batch_size)
740 return -EINVAL;
741
742 if (ctx_size_in < prog->aux->max_ctx_offset ||
743 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
744 return -EINVAL;
745
746 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
747 return -EINVAL;
748
749 if (ctx_size_in) {
750 info.ctx = memdup_user(ctx_in, ctx_size_in);
751 if (IS_ERR(info.ctx))
752 return PTR_ERR(info.ctx);
753 } else {
754 info.ctx = NULL;
755 }
756
757 info.prog = prog;
758
759 current_cpu = get_cpu();
760 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 ||
761 cpu == current_cpu) {
762 __bpf_prog_test_run_raw_tp(&info);
763 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
764 /* smp_call_function_single() also checks cpu_online()
765 * after csd_lock(). However, since cpu is from user
766 * space, let's do an extra quick check to filter out
767 * invalid value before smp_call_function_single().
768 */
769 err = -ENXIO;
770 } else {
771 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
772 &info, 1);
773 }
774 put_cpu();
775
776 if (!err &&
777 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
778 err = -EFAULT;
779
780 kfree(info.ctx);
781 return err;
782}
783
784static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
785{
786 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
787 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
788 u32 size = kattr->test.ctx_size_in;
789 void *data;
790 int err;
791
792 if (!data_in && !data_out)
793 return NULL;
794
795 data = kzalloc(max_size, GFP_USER);
796 if (!data)
797 return ERR_PTR(-ENOMEM);
798
799 if (data_in) {
800 err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size);
801 if (err) {
802 kfree(data);
803 return ERR_PTR(err);
804 }
805
806 size = min_t(u32, max_size, size);
807 if (copy_from_user(data, data_in, size)) {
808 kfree(data);
809 return ERR_PTR(-EFAULT);
810 }
811 }
812 return data;
813}
814
815static int bpf_ctx_finish(const union bpf_attr *kattr,
816 union bpf_attr __user *uattr, const void *data,
817 u32 size)
818{
819 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
820 int err = -EFAULT;
821 u32 copy_size = size;
822
823 if (!data || !data_out)
824 return 0;
825
826 if (copy_size > kattr->test.ctx_size_out) {
827 copy_size = kattr->test.ctx_size_out;
828 err = -ENOSPC;
829 }
830
831 if (copy_to_user(data_out, data, copy_size))
832 goto out;
833 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
834 goto out;
835 if (err != -ENOSPC)
836 err = 0;
837out:
838 return err;
839}
840
841/**
842 * range_is_zero - test whether buffer is initialized
843 * @buf: buffer to check
844 * @from: check from this position
845 * @to: check up until (excluding) this position
846 *
847 * This function returns true if the there is a non-zero byte
848 * in the buf in the range [from,to).
849 */
850static inline bool range_is_zero(void *buf, size_t from, size_t to)
851{
852 return !memchr_inv((u8 *)buf + from, 0, to - from);
853}
854
855static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
856{
857 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
858
859 if (!__skb)
860 return 0;
861
862 /* make sure the fields we don't use are zeroed */
863 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
864 return -EINVAL;
865
866 /* mark is allowed */
867
868 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
869 offsetof(struct __sk_buff, priority)))
870 return -EINVAL;
871
872 /* priority is allowed */
873 /* ingress_ifindex is allowed */
874 /* ifindex is allowed */
875
876 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
877 offsetof(struct __sk_buff, cb)))
878 return -EINVAL;
879
880 /* cb is allowed */
881
882 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
883 offsetof(struct __sk_buff, tstamp)))
884 return -EINVAL;
885
886 /* tstamp is allowed */
887 /* wire_len is allowed */
888 /* gso_segs is allowed */
889
890 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
891 offsetof(struct __sk_buff, gso_size)))
892 return -EINVAL;
893
894 /* gso_size is allowed */
895
896 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
897 offsetof(struct __sk_buff, hwtstamp)))
898 return -EINVAL;
899
900 /* hwtstamp is allowed */
901
902 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, hwtstamp),
903 sizeof(struct __sk_buff)))
904 return -EINVAL;
905
906 skb->mark = __skb->mark;
907 skb->priority = __skb->priority;
908 skb->skb_iif = __skb->ingress_ifindex;
909 skb->tstamp = __skb->tstamp;
910 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
911
912 if (__skb->wire_len == 0) {
913 cb->pkt_len = skb->len;
914 } else {
915 if (__skb->wire_len < skb->len ||
916 __skb->wire_len > GSO_LEGACY_MAX_SIZE)
917 return -EINVAL;
918 cb->pkt_len = __skb->wire_len;
919 }
920
921 if (__skb->gso_segs > GSO_MAX_SEGS)
922 return -EINVAL;
923 skb_shinfo(skb)->gso_segs = __skb->gso_segs;
924 skb_shinfo(skb)->gso_size = __skb->gso_size;
925 skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp;
926
927 return 0;
928}
929
930static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
931{
932 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
933
934 if (!__skb)
935 return;
936
937 __skb->mark = skb->mark;
938 __skb->priority = skb->priority;
939 __skb->ingress_ifindex = skb->skb_iif;
940 __skb->ifindex = skb->dev->ifindex;
941 __skb->tstamp = skb->tstamp;
942 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
943 __skb->wire_len = cb->pkt_len;
944 __skb->gso_segs = skb_shinfo(skb)->gso_segs;
945 __skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp;
946}
947
948static struct proto bpf_dummy_proto = {
949 .name = "bpf_dummy",
950 .owner = THIS_MODULE,
951 .obj_size = sizeof(struct sock),
952};
953
954int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
955 union bpf_attr __user *uattr)
956{
957 bool is_l2 = false, is_direct_pkt_access = false;
958 struct net *net = current->nsproxy->net_ns;
959 struct net_device *dev = net->loopback_dev;
960 u32 size = kattr->test.data_size_in;
961 u32 repeat = kattr->test.repeat;
962 struct __sk_buff *ctx = NULL;
963 u32 retval, duration;
964 int hh_len = ETH_HLEN;
965 struct sk_buff *skb;
966 struct sock *sk;
967 void *data;
968 int ret;
969
970 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
971 return -EINVAL;
972
973 data = bpf_test_init(kattr, kattr->test.data_size_in,
974 size, NET_SKB_PAD + NET_IP_ALIGN,
975 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
976 if (IS_ERR(data))
977 return PTR_ERR(data);
978
979 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
980 if (IS_ERR(ctx)) {
981 kfree(data);
982 return PTR_ERR(ctx);
983 }
984
985 switch (prog->type) {
986 case BPF_PROG_TYPE_SCHED_CLS:
987 case BPF_PROG_TYPE_SCHED_ACT:
988 is_l2 = true;
989 fallthrough;
990 case BPF_PROG_TYPE_LWT_IN:
991 case BPF_PROG_TYPE_LWT_OUT:
992 case BPF_PROG_TYPE_LWT_XMIT:
993 is_direct_pkt_access = true;
994 break;
995 default:
996 break;
997 }
998
999 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
1000 if (!sk) {
1001 kfree(data);
1002 kfree(ctx);
1003 return -ENOMEM;
1004 }
1005 sock_init_data(NULL, sk);
1006
1007 skb = slab_build_skb(data);
1008 if (!skb) {
1009 kfree(data);
1010 kfree(ctx);
1011 sk_free(sk);
1012 return -ENOMEM;
1013 }
1014 skb->sk = sk;
1015
1016 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
1017 __skb_put(skb, size);
1018 if (ctx && ctx->ifindex > 1) {
1019 dev = dev_get_by_index(net, ctx->ifindex);
1020 if (!dev) {
1021 ret = -ENODEV;
1022 goto out;
1023 }
1024 }
1025 skb->protocol = eth_type_trans(skb, dev);
1026 skb_reset_network_header(skb);
1027
1028 switch (skb->protocol) {
1029 case htons(ETH_P_IP):
1030 sk->sk_family = AF_INET;
1031 if (sizeof(struct iphdr) <= skb_headlen(skb)) {
1032 sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
1033 sk->sk_daddr = ip_hdr(skb)->daddr;
1034 }
1035 break;
1036#if IS_ENABLED(CONFIG_IPV6)
1037 case htons(ETH_P_IPV6):
1038 sk->sk_family = AF_INET6;
1039 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
1040 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
1041 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
1042 }
1043 break;
1044#endif
1045 default:
1046 break;
1047 }
1048
1049 if (is_l2)
1050 __skb_push(skb, hh_len);
1051 if (is_direct_pkt_access)
1052 bpf_compute_data_pointers(skb);
1053 ret = convert___skb_to_skb(skb, ctx);
1054 if (ret)
1055 goto out;
1056 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
1057 if (ret)
1058 goto out;
1059 if (!is_l2) {
1060 if (skb_headroom(skb) < hh_len) {
1061 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
1062
1063 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
1064 ret = -ENOMEM;
1065 goto out;
1066 }
1067 }
1068 memset(__skb_push(skb, hh_len), 0, hh_len);
1069 }
1070 convert_skb_to___skb(skb, ctx);
1071
1072 size = skb->len;
1073 /* bpf program can never convert linear skb to non-linear */
1074 if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
1075 size = skb_headlen(skb);
1076 ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval,
1077 duration);
1078 if (!ret)
1079 ret = bpf_ctx_finish(kattr, uattr, ctx,
1080 sizeof(struct __sk_buff));
1081out:
1082 if (dev && dev != net->loopback_dev)
1083 dev_put(dev);
1084 kfree_skb(skb);
1085 sk_free(sk);
1086 kfree(ctx);
1087 return ret;
1088}
1089
1090static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp)
1091{
1092 unsigned int ingress_ifindex, rx_queue_index;
1093 struct netdev_rx_queue *rxqueue;
1094 struct net_device *device;
1095
1096 if (!xdp_md)
1097 return 0;
1098
1099 if (xdp_md->egress_ifindex != 0)
1100 return -EINVAL;
1101
1102 ingress_ifindex = xdp_md->ingress_ifindex;
1103 rx_queue_index = xdp_md->rx_queue_index;
1104
1105 if (!ingress_ifindex && rx_queue_index)
1106 return -EINVAL;
1107
1108 if (ingress_ifindex) {
1109 device = dev_get_by_index(current->nsproxy->net_ns,
1110 ingress_ifindex);
1111 if (!device)
1112 return -ENODEV;
1113
1114 if (rx_queue_index >= device->real_num_rx_queues)
1115 goto free_dev;
1116
1117 rxqueue = __netif_get_rx_queue(device, rx_queue_index);
1118
1119 if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq))
1120 goto free_dev;
1121
1122 xdp->rxq = &rxqueue->xdp_rxq;
1123 /* The device is now tracked in the xdp->rxq for later
1124 * dev_put()
1125 */
1126 }
1127
1128 xdp->data = xdp->data_meta + xdp_md->data;
1129 return 0;
1130
1131free_dev:
1132 dev_put(device);
1133 return -EINVAL;
1134}
1135
1136static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md)
1137{
1138 if (!xdp_md)
1139 return;
1140
1141 xdp_md->data = xdp->data - xdp->data_meta;
1142 xdp_md->data_end = xdp->data_end - xdp->data_meta;
1143
1144 if (xdp_md->ingress_ifindex)
1145 dev_put(xdp->rxq->dev);
1146}
1147
1148int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1149 union bpf_attr __user *uattr)
1150{
1151 bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES);
1152 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1153 u32 batch_size = kattr->test.batch_size;
1154 u32 retval = 0, duration, max_data_sz;
1155 u32 size = kattr->test.data_size_in;
1156 u32 headroom = XDP_PACKET_HEADROOM;
1157 u32 repeat = kattr->test.repeat;
1158 struct netdev_rx_queue *rxqueue;
1159 struct skb_shared_info *sinfo;
1160 struct xdp_buff xdp = {};
1161 int i, ret = -EINVAL;
1162 struct xdp_md *ctx;
1163 void *data;
1164
1165 if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
1166 prog->expected_attach_type == BPF_XDP_CPUMAP)
1167 return -EINVAL;
1168
1169 if (kattr->test.flags & ~BPF_F_TEST_XDP_LIVE_FRAMES)
1170 return -EINVAL;
1171
1172 if (bpf_prog_is_dev_bound(prog->aux))
1173 return -EINVAL;
1174
1175 if (do_live) {
1176 if (!batch_size)
1177 batch_size = NAPI_POLL_WEIGHT;
1178 else if (batch_size > TEST_XDP_MAX_BATCH)
1179 return -E2BIG;
1180
1181 headroom += sizeof(struct xdp_page_head);
1182 } else if (batch_size) {
1183 return -EINVAL;
1184 }
1185
1186 ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md));
1187 if (IS_ERR(ctx))
1188 return PTR_ERR(ctx);
1189
1190 if (ctx) {
1191 /* There can't be user provided data before the meta data */
1192 if (ctx->data_meta || ctx->data_end != size ||
1193 ctx->data > ctx->data_end ||
1194 unlikely(xdp_metalen_invalid(ctx->data)) ||
1195 (do_live && (kattr->test.data_out || kattr->test.ctx_out)))
1196 goto free_ctx;
1197 /* Meta data is allocated from the headroom */
1198 headroom -= ctx->data;
1199 }
1200
1201 max_data_sz = 4096 - headroom - tailroom;
1202 if (size > max_data_sz) {
1203 /* disallow live data mode for jumbo frames */
1204 if (do_live)
1205 goto free_ctx;
1206 size = max_data_sz;
1207 }
1208
1209 data = bpf_test_init(kattr, size, max_data_sz, headroom, tailroom);
1210 if (IS_ERR(data)) {
1211 ret = PTR_ERR(data);
1212 goto free_ctx;
1213 }
1214
1215 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
1216 rxqueue->xdp_rxq.frag_size = headroom + max_data_sz + tailroom;
1217 xdp_init_buff(&xdp, rxqueue->xdp_rxq.frag_size, &rxqueue->xdp_rxq);
1218 xdp_prepare_buff(&xdp, data, headroom, size, true);
1219 sinfo = xdp_get_shared_info_from_buff(&xdp);
1220
1221 ret = xdp_convert_md_to_buff(ctx, &xdp);
1222 if (ret)
1223 goto free_data;
1224
1225 if (unlikely(kattr->test.data_size_in > size)) {
1226 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
1227
1228 while (size < kattr->test.data_size_in) {
1229 struct page *page;
1230 skb_frag_t *frag;
1231 u32 data_len;
1232
1233 if (sinfo->nr_frags == MAX_SKB_FRAGS) {
1234 ret = -ENOMEM;
1235 goto out;
1236 }
1237
1238 page = alloc_page(GFP_KERNEL);
1239 if (!page) {
1240 ret = -ENOMEM;
1241 goto out;
1242 }
1243
1244 frag = &sinfo->frags[sinfo->nr_frags++];
1245
1246 data_len = min_t(u32, kattr->test.data_size_in - size,
1247 PAGE_SIZE);
1248 skb_frag_fill_page_desc(frag, page, 0, data_len);
1249
1250 if (copy_from_user(page_address(page), data_in + size,
1251 data_len)) {
1252 ret = -EFAULT;
1253 goto out;
1254 }
1255 sinfo->xdp_frags_size += data_len;
1256 size += data_len;
1257 }
1258 xdp_buff_set_frags_flag(&xdp);
1259 }
1260
1261 if (repeat > 1)
1262 bpf_prog_change_xdp(NULL, prog);
1263
1264 if (do_live)
1265 ret = bpf_test_run_xdp_live(prog, &xdp, repeat, batch_size, &duration);
1266 else
1267 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
1268 /* We convert the xdp_buff back to an xdp_md before checking the return
1269 * code so the reference count of any held netdevice will be decremented
1270 * even if the test run failed.
1271 */
1272 xdp_convert_buff_to_md(&xdp, ctx);
1273 if (ret)
1274 goto out;
1275
1276 size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size;
1277 ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size,
1278 retval, duration);
1279 if (!ret)
1280 ret = bpf_ctx_finish(kattr, uattr, ctx,
1281 sizeof(struct xdp_md));
1282
1283out:
1284 if (repeat > 1)
1285 bpf_prog_change_xdp(prog, NULL);
1286free_data:
1287 for (i = 0; i < sinfo->nr_frags; i++)
1288 __free_page(skb_frag_page(&sinfo->frags[i]));
1289 kfree(data);
1290free_ctx:
1291 kfree(ctx);
1292 return ret;
1293}
1294
1295static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
1296{
1297 /* make sure the fields we don't use are zeroed */
1298 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
1299 return -EINVAL;
1300
1301 /* flags is allowed */
1302
1303 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
1304 sizeof(struct bpf_flow_keys)))
1305 return -EINVAL;
1306
1307 return 0;
1308}
1309
1310int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1311 const union bpf_attr *kattr,
1312 union bpf_attr __user *uattr)
1313{
1314 struct bpf_test_timer t = { NO_PREEMPT };
1315 u32 size = kattr->test.data_size_in;
1316 struct bpf_flow_dissector ctx = {};
1317 u32 repeat = kattr->test.repeat;
1318 struct bpf_flow_keys *user_ctx;
1319 struct bpf_flow_keys flow_keys;
1320 const struct ethhdr *eth;
1321 unsigned int flags = 0;
1322 u32 retval, duration;
1323 void *data;
1324 int ret;
1325
1326 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1327 return -EINVAL;
1328
1329 if (size < ETH_HLEN)
1330 return -EINVAL;
1331
1332 data = bpf_test_init(kattr, kattr->test.data_size_in, size, 0, 0);
1333 if (IS_ERR(data))
1334 return PTR_ERR(data);
1335
1336 eth = (struct ethhdr *)data;
1337
1338 if (!repeat)
1339 repeat = 1;
1340
1341 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
1342 if (IS_ERR(user_ctx)) {
1343 kfree(data);
1344 return PTR_ERR(user_ctx);
1345 }
1346 if (user_ctx) {
1347 ret = verify_user_bpf_flow_keys(user_ctx);
1348 if (ret)
1349 goto out;
1350 flags = user_ctx->flags;
1351 }
1352
1353 ctx.flow_keys = &flow_keys;
1354 ctx.data = data;
1355 ctx.data_end = (__u8 *)data + size;
1356
1357 bpf_test_timer_enter(&t);
1358 do {
1359 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
1360 size, flags);
1361 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
1362 bpf_test_timer_leave(&t);
1363
1364 if (ret < 0)
1365 goto out;
1366
1367 ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL,
1368 sizeof(flow_keys), retval, duration);
1369 if (!ret)
1370 ret = bpf_ctx_finish(kattr, uattr, user_ctx,
1371 sizeof(struct bpf_flow_keys));
1372
1373out:
1374 kfree(user_ctx);
1375 kfree(data);
1376 return ret;
1377}
1378
1379int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr,
1380 union bpf_attr __user *uattr)
1381{
1382 struct bpf_test_timer t = { NO_PREEMPT };
1383 struct bpf_prog_array *progs = NULL;
1384 struct bpf_sk_lookup_kern ctx = {};
1385 u32 repeat = kattr->test.repeat;
1386 struct bpf_sk_lookup *user_ctx;
1387 u32 retval, duration;
1388 int ret = -EINVAL;
1389
1390 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1391 return -EINVAL;
1392
1393 if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out ||
1394 kattr->test.data_size_out)
1395 return -EINVAL;
1396
1397 if (!repeat)
1398 repeat = 1;
1399
1400 user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx));
1401 if (IS_ERR(user_ctx))
1402 return PTR_ERR(user_ctx);
1403
1404 if (!user_ctx)
1405 return -EINVAL;
1406
1407 if (user_ctx->sk)
1408 goto out;
1409
1410 if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx)))
1411 goto out;
1412
1413 if (user_ctx->local_port > U16_MAX) {
1414 ret = -ERANGE;
1415 goto out;
1416 }
1417
1418 ctx.family = (u16)user_ctx->family;
1419 ctx.protocol = (u16)user_ctx->protocol;
1420 ctx.dport = (u16)user_ctx->local_port;
1421 ctx.sport = user_ctx->remote_port;
1422
1423 switch (ctx.family) {
1424 case AF_INET:
1425 ctx.v4.daddr = (__force __be32)user_ctx->local_ip4;
1426 ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4;
1427 break;
1428
1429#if IS_ENABLED(CONFIG_IPV6)
1430 case AF_INET6:
1431 ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6;
1432 ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6;
1433 break;
1434#endif
1435
1436 default:
1437 ret = -EAFNOSUPPORT;
1438 goto out;
1439 }
1440
1441 progs = bpf_prog_array_alloc(1, GFP_KERNEL);
1442 if (!progs) {
1443 ret = -ENOMEM;
1444 goto out;
1445 }
1446
1447 progs->items[0].prog = prog;
1448
1449 bpf_test_timer_enter(&t);
1450 do {
1451 ctx.selected_sk = NULL;
1452 retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run);
1453 } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
1454 bpf_test_timer_leave(&t);
1455
1456 if (ret < 0)
1457 goto out;
1458
1459 user_ctx->cookie = 0;
1460 if (ctx.selected_sk) {
1461 if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) {
1462 ret = -EOPNOTSUPP;
1463 goto out;
1464 }
1465
1466 user_ctx->cookie = sock_gen_cookie(ctx.selected_sk);
1467 }
1468
1469 ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
1470 if (!ret)
1471 ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx));
1472
1473out:
1474 bpf_prog_array_free(progs);
1475 kfree(user_ctx);
1476 return ret;
1477}
1478
1479int bpf_prog_test_run_syscall(struct bpf_prog *prog,
1480 const union bpf_attr *kattr,
1481 union bpf_attr __user *uattr)
1482{
1483 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
1484 __u32 ctx_size_in = kattr->test.ctx_size_in;
1485 void *ctx = NULL;
1486 u32 retval;
1487 int err = 0;
1488
1489 /* doesn't support data_in/out, ctx_out, duration, or repeat or flags */
1490 if (kattr->test.data_in || kattr->test.data_out ||
1491 kattr->test.ctx_out || kattr->test.duration ||
1492 kattr->test.repeat || kattr->test.flags ||
1493 kattr->test.batch_size)
1494 return -EINVAL;
1495
1496 if (ctx_size_in < prog->aux->max_ctx_offset ||
1497 ctx_size_in > U16_MAX)
1498 return -EINVAL;
1499
1500 if (ctx_size_in) {
1501 ctx = memdup_user(ctx_in, ctx_size_in);
1502 if (IS_ERR(ctx))
1503 return PTR_ERR(ctx);
1504 }
1505
1506 rcu_read_lock_trace();
1507 retval = bpf_prog_run_pin_on_cpu(prog, ctx);
1508 rcu_read_unlock_trace();
1509
1510 if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) {
1511 err = -EFAULT;
1512 goto out;
1513 }
1514 if (ctx_size_in)
1515 if (copy_to_user(ctx_in, ctx, ctx_size_in))
1516 err = -EFAULT;
1517out:
1518 kfree(ctx);
1519 return err;
1520}
1521
1522static int verify_and_copy_hook_state(struct nf_hook_state *state,
1523 const struct nf_hook_state *user,
1524 struct net_device *dev)
1525{
1526 if (user->in || user->out)
1527 return -EINVAL;
1528
1529 if (user->net || user->sk || user->okfn)
1530 return -EINVAL;
1531
1532 switch (user->pf) {
1533 case NFPROTO_IPV4:
1534 case NFPROTO_IPV6:
1535 switch (state->hook) {
1536 case NF_INET_PRE_ROUTING:
1537 state->in = dev;
1538 break;
1539 case NF_INET_LOCAL_IN:
1540 state->in = dev;
1541 break;
1542 case NF_INET_FORWARD:
1543 state->in = dev;
1544 state->out = dev;
1545 break;
1546 case NF_INET_LOCAL_OUT:
1547 state->out = dev;
1548 break;
1549 case NF_INET_POST_ROUTING:
1550 state->out = dev;
1551 break;
1552 }
1553
1554 break;
1555 default:
1556 return -EINVAL;
1557 }
1558
1559 state->pf = user->pf;
1560 state->hook = user->hook;
1561
1562 return 0;
1563}
1564
1565static __be16 nfproto_eth(int nfproto)
1566{
1567 switch (nfproto) {
1568 case NFPROTO_IPV4:
1569 return htons(ETH_P_IP);
1570 case NFPROTO_IPV6:
1571 break;
1572 }
1573
1574 return htons(ETH_P_IPV6);
1575}
1576
1577int bpf_prog_test_run_nf(struct bpf_prog *prog,
1578 const union bpf_attr *kattr,
1579 union bpf_attr __user *uattr)
1580{
1581 struct net *net = current->nsproxy->net_ns;
1582 struct net_device *dev = net->loopback_dev;
1583 struct nf_hook_state *user_ctx, hook_state = {
1584 .pf = NFPROTO_IPV4,
1585 .hook = NF_INET_LOCAL_OUT,
1586 };
1587 u32 size = kattr->test.data_size_in;
1588 u32 repeat = kattr->test.repeat;
1589 struct bpf_nf_ctx ctx = {
1590 .state = &hook_state,
1591 };
1592 struct sk_buff *skb = NULL;
1593 u32 retval, duration;
1594 void *data;
1595 int ret;
1596
1597 if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1598 return -EINVAL;
1599
1600 if (size < sizeof(struct iphdr))
1601 return -EINVAL;
1602
1603 data = bpf_test_init(kattr, kattr->test.data_size_in, size,
1604 NET_SKB_PAD + NET_IP_ALIGN,
1605 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
1606 if (IS_ERR(data))
1607 return PTR_ERR(data);
1608
1609 if (!repeat)
1610 repeat = 1;
1611
1612 user_ctx = bpf_ctx_init(kattr, sizeof(struct nf_hook_state));
1613 if (IS_ERR(user_ctx)) {
1614 kfree(data);
1615 return PTR_ERR(user_ctx);
1616 }
1617
1618 if (user_ctx) {
1619 ret = verify_and_copy_hook_state(&hook_state, user_ctx, dev);
1620 if (ret)
1621 goto out;
1622 }
1623
1624 skb = slab_build_skb(data);
1625 if (!skb) {
1626 ret = -ENOMEM;
1627 goto out;
1628 }
1629
1630 data = NULL; /* data released via kfree_skb */
1631
1632 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
1633 __skb_put(skb, size);
1634
1635 ret = -EINVAL;
1636
1637 if (hook_state.hook != NF_INET_LOCAL_OUT) {
1638 if (size < ETH_HLEN + sizeof(struct iphdr))
1639 goto out;
1640
1641 skb->protocol = eth_type_trans(skb, dev);
1642 switch (skb->protocol) {
1643 case htons(ETH_P_IP):
1644 if (hook_state.pf == NFPROTO_IPV4)
1645 break;
1646 goto out;
1647 case htons(ETH_P_IPV6):
1648 if (size < ETH_HLEN + sizeof(struct ipv6hdr))
1649 goto out;
1650 if (hook_state.pf == NFPROTO_IPV6)
1651 break;
1652 goto out;
1653 default:
1654 ret = -EPROTO;
1655 goto out;
1656 }
1657
1658 skb_reset_network_header(skb);
1659 } else {
1660 skb->protocol = nfproto_eth(hook_state.pf);
1661 }
1662
1663 ctx.skb = skb;
1664
1665 ret = bpf_test_run(prog, &ctx, repeat, &retval, &duration, false);
1666 if (ret)
1667 goto out;
1668
1669 ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
1670
1671out:
1672 kfree(user_ctx);
1673 kfree_skb(skb);
1674 kfree(data);
1675 return ret;
1676}
1677
1678static const struct btf_kfunc_id_set bpf_prog_test_kfunc_set = {
1679 .owner = THIS_MODULE,
1680 .set = &test_sk_check_kfunc_ids,
1681};
1682
1683BTF_ID_LIST(bpf_prog_test_dtor_kfunc_ids)
1684BTF_ID(struct, prog_test_ref_kfunc)
1685BTF_ID(func, bpf_kfunc_call_test_release_dtor)
1686BTF_ID(struct, prog_test_member)
1687BTF_ID(func, bpf_kfunc_call_memb_release_dtor)
1688
1689static int __init bpf_prog_test_run_init(void)
1690{
1691 const struct btf_id_dtor_kfunc bpf_prog_test_dtor_kfunc[] = {
1692 {
1693 .btf_id = bpf_prog_test_dtor_kfunc_ids[0],
1694 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[1]
1695 },
1696 {
1697 .btf_id = bpf_prog_test_dtor_kfunc_ids[2],
1698 .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[3],
1699 },
1700 };
1701 int ret;
1702
1703 ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set);
1704 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
1705 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set);
1706 ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set);
1707 return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,
1708 ARRAY_SIZE(bpf_prog_test_dtor_kfunc),
1709 THIS_MODULE);
1710}
1711late_initcall(bpf_prog_test_run_init);