1 // SPDX-License-Identifier: GPL-2.0-only
2 /* Copyright (c) 2017 Facebook
3 */
4 #include <linux/bpf.h>
5 #include <linux/slab.h>
6 #include <linux/vmalloc.h>
7 #include <linux/etherdevice.h>
8 #include <linux/filter.h>
9 #include <linux/sched/signal.h>
10 #include <net/bpf_sk_storage.h>
11 #include <net/sock.h>
12 #include <net/tcp.h>
13 #include <linux/error-injection.h>
14 #include <linux/smp.h>
15
16 #define CREATE_TRACE_POINTS
17 #include <trace/events/bpf_test_run.h>
18
bpf_test_run(struct bpf_prog * prog,void * ctx,u32 repeat,u32 * retval,u32 * time,bool xdp)19 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
20 u32 *retval, u32 *time, bool xdp)
21 {
22 struct bpf_prog_array_item item = {.prog = prog};
23 struct bpf_run_ctx *old_ctx;
24 struct bpf_cg_run_ctx run_ctx;
25 enum bpf_cgroup_storage_type stype;
26 u64 time_start, time_spent = 0;
27 int ret = 0;
28 u32 i;
29
30 for_each_cgroup_storage_type(stype) {
31 item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
32 if (IS_ERR(item.cgroup_storage[stype])) {
33 item.cgroup_storage[stype] = NULL;
34 for_each_cgroup_storage_type(stype)
35 bpf_cgroup_storage_free(item.cgroup_storage[stype]);
36 return -ENOMEM;
37 }
38 }
39
40 if (!repeat)
41 repeat = 1;
42
43 rcu_read_lock();
44 migrate_disable();
45 time_start = ktime_get_ns();
46 old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
47 for (i = 0; i < repeat; i++) {
48 run_ctx.prog_item = &item;
49
50 if (xdp)
51 *retval = bpf_prog_run_xdp(prog, ctx);
52 else
53 *retval = BPF_PROG_RUN(prog, ctx);
54
55 if (signal_pending(current)) {
56 ret = -EINTR;
57 break;
58 }
59
60 if (need_resched()) {
61 time_spent += ktime_get_ns() - time_start;
62 migrate_enable();
63 rcu_read_unlock();
64
65 cond_resched();
66
67 rcu_read_lock();
68 migrate_disable();
69 time_start = ktime_get_ns();
70 }
71 }
72 bpf_reset_run_ctx(old_ctx);
73 time_spent += ktime_get_ns() - time_start;
74 migrate_enable();
75 rcu_read_unlock();
76
77 do_div(time_spent, repeat);
78 *time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
79
80 for_each_cgroup_storage_type(stype)
81 bpf_cgroup_storage_free(item.cgroup_storage[stype]);
82
83 return ret;
84 }
85
bpf_test_finish(const union bpf_attr * kattr,union bpf_attr __user * uattr,const void * data,u32 size,u32 retval,u32 duration)86 static int bpf_test_finish(const union bpf_attr *kattr,
87 union bpf_attr __user *uattr, const void *data,
88 u32 size, u32 retval, u32 duration)
89 {
90 void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
91 int err = -EFAULT;
92 u32 copy_size = size;
93
94 /* Clamp copy if the user has provided a size hint, but copy the full
95 * buffer if not to retain old behaviour.
96 */
97 if (kattr->test.data_size_out &&
98 copy_size > kattr->test.data_size_out) {
99 copy_size = kattr->test.data_size_out;
100 err = -ENOSPC;
101 }
102
103 if (data_out && copy_to_user(data_out, data, copy_size))
104 goto out;
105 if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
106 goto out;
107 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
108 goto out;
109 if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
110 goto out;
111 if (err != -ENOSPC)
112 err = 0;
113 out:
114 trace_bpf_test_finish(&err);
115 return err;
116 }
117
118 /* Integer types of various sizes and pointer combinations cover variety of
119 * architecture dependent calling conventions. 7+ can be supported in the
120 * future.
121 */
122 __diag_push();
123 __diag_ignore(GCC, 8, "-Wmissing-prototypes",
124 "Global functions as their definitions will be in vmlinux BTF");
bpf_fentry_test1(int a)125 int noinline bpf_fentry_test1(int a)
126 {
127 return a + 1;
128 }
129
bpf_fentry_test2(int a,u64 b)130 int noinline bpf_fentry_test2(int a, u64 b)
131 {
132 return a + b;
133 }
134
bpf_fentry_test3(char a,int b,u64 c)135 int noinline bpf_fentry_test3(char a, int b, u64 c)
136 {
137 return a + b + c;
138 }
139
bpf_fentry_test4(void * a,char b,int c,u64 d)140 int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
141 {
142 return (long)a + b + c + d;
143 }
144
bpf_fentry_test5(u64 a,void * b,short c,int d,u64 e)145 int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
146 {
147 return a + (long)b + c + d + e;
148 }
149
bpf_fentry_test6(u64 a,void * b,short c,int d,void * e,u64 f)150 int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
151 {
152 return a + (long)b + c + d + (long)e + f;
153 }
154
155 struct bpf_fentry_test_t {
156 struct bpf_fentry_test_t *a;
157 };
158
bpf_fentry_test7(struct bpf_fentry_test_t * arg)159 int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
160 {
161 return (long)arg;
162 }
163
bpf_fentry_test8(struct bpf_fentry_test_t * arg)164 int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
165 {
166 return (long)arg->a;
167 }
168
bpf_modify_return_test(int a,int * b)169 int noinline bpf_modify_return_test(int a, int *b)
170 {
171 *b += 1;
172 return a + *b;
173 }
174 __diag_pop();
175
176 ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);
177
bpf_test_init(const union bpf_attr * kattr,u32 size,u32 headroom,u32 tailroom)178 static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
179 u32 headroom, u32 tailroom)
180 {
181 void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
182 u32 user_size = kattr->test.data_size_in;
183 void *data;
184
185 if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
186 return ERR_PTR(-EINVAL);
187
188 if (user_size > size)
189 return ERR_PTR(-EMSGSIZE);
190
191 size = SKB_DATA_ALIGN(size);
192 data = kzalloc(size + headroom + tailroom, GFP_USER);
193 if (!data)
194 return ERR_PTR(-ENOMEM);
195
196 if (copy_from_user(data + headroom, data_in, user_size)) {
197 kfree(data);
198 return ERR_PTR(-EFAULT);
199 }
200
201 return data;
202 }
203
bpf_prog_test_run_tracing(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)204 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
205 const union bpf_attr *kattr,
206 union bpf_attr __user *uattr)
207 {
208 struct bpf_fentry_test_t arg = {};
209 u16 side_effect = 0, ret = 0;
210 int b = 2, err = -EFAULT;
211 u32 retval = 0;
212
213 if (kattr->test.flags || kattr->test.cpu)
214 return -EINVAL;
215
216 switch (prog->expected_attach_type) {
217 case BPF_TRACE_FENTRY:
218 case BPF_TRACE_FEXIT:
219 if (bpf_fentry_test1(1) != 2 ||
220 bpf_fentry_test2(2, 3) != 5 ||
221 bpf_fentry_test3(4, 5, 6) != 15 ||
222 bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
223 bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
224 bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
225 bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
226 bpf_fentry_test8(&arg) != 0)
227 goto out;
228 break;
229 case BPF_MODIFY_RETURN:
230 ret = bpf_modify_return_test(1, &b);
231 if (b != 2)
232 side_effect = 1;
233 break;
234 default:
235 goto out;
236 }
237
238 retval = ((u32)side_effect << 16) | ret;
239 if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
240 goto out;
241
242 err = 0;
243 out:
244 trace_bpf_test_finish(&err);
245 return err;
246 }
247
248 struct bpf_raw_tp_test_run_info {
249 struct bpf_prog *prog;
250 void *ctx;
251 u32 retval;
252 };
253
254 static void
__bpf_prog_test_run_raw_tp(void * data)255 __bpf_prog_test_run_raw_tp(void *data)
256 {
257 struct bpf_raw_tp_test_run_info *info = data;
258
259 rcu_read_lock();
260 info->retval = BPF_PROG_RUN(info->prog, info->ctx);
261 rcu_read_unlock();
262 }
263
bpf_prog_test_run_raw_tp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)264 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
265 const union bpf_attr *kattr,
266 union bpf_attr __user *uattr)
267 {
268 void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
269 __u32 ctx_size_in = kattr->test.ctx_size_in;
270 struct bpf_raw_tp_test_run_info info;
271 int cpu = kattr->test.cpu, err = 0;
272 int current_cpu;
273
274 /* doesn't support data_in/out, ctx_out, duration, or repeat */
275 if (kattr->test.data_in || kattr->test.data_out ||
276 kattr->test.ctx_out || kattr->test.duration ||
277 kattr->test.repeat)
278 return -EINVAL;
279
280 if (ctx_size_in < prog->aux->max_ctx_offset ||
281 ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
282 return -EINVAL;
283
284 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
285 return -EINVAL;
286
287 if (ctx_size_in) {
288 info.ctx = kzalloc(ctx_size_in, GFP_USER);
289 if (!info.ctx)
290 return -ENOMEM;
291 if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) {
292 err = -EFAULT;
293 goto out;
294 }
295 } else {
296 info.ctx = NULL;
297 }
298
299 info.prog = prog;
300
301 current_cpu = get_cpu();
302 if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 ||
303 cpu == current_cpu) {
304 __bpf_prog_test_run_raw_tp(&info);
305 } else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
306 /* smp_call_function_single() also checks cpu_online()
307 * after csd_lock(). However, since cpu is from user
308 * space, let's do an extra quick check to filter out
309 * invalid value before smp_call_function_single().
310 */
311 err = -ENXIO;
312 } else {
313 err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
314 &info, 1);
315 }
316 put_cpu();
317
318 if (!err &&
319 copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
320 err = -EFAULT;
321
322 out:
323 kfree(info.ctx);
324 return err;
325 }
326
bpf_ctx_init(const union bpf_attr * kattr,u32 max_size)327 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
328 {
329 void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
330 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
331 u32 size = kattr->test.ctx_size_in;
332 void *data;
333 int err;
334
335 if (!data_in && !data_out)
336 return NULL;
337
338 data = kzalloc(max_size, GFP_USER);
339 if (!data)
340 return ERR_PTR(-ENOMEM);
341
342 if (data_in) {
343 err = bpf_check_uarg_tail_zero(data_in, max_size, size);
344 if (err) {
345 kfree(data);
346 return ERR_PTR(err);
347 }
348
349 size = min_t(u32, max_size, size);
350 if (copy_from_user(data, data_in, size)) {
351 kfree(data);
352 return ERR_PTR(-EFAULT);
353 }
354 }
355 return data;
356 }
357
bpf_ctx_finish(const union bpf_attr * kattr,union bpf_attr __user * uattr,const void * data,u32 size)358 static int bpf_ctx_finish(const union bpf_attr *kattr,
359 union bpf_attr __user *uattr, const void *data,
360 u32 size)
361 {
362 void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
363 int err = -EFAULT;
364 u32 copy_size = size;
365
366 if (!data || !data_out)
367 return 0;
368
369 if (copy_size > kattr->test.ctx_size_out) {
370 copy_size = kattr->test.ctx_size_out;
371 err = -ENOSPC;
372 }
373
374 if (copy_to_user(data_out, data, copy_size))
375 goto out;
376 if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
377 goto out;
378 if (err != -ENOSPC)
379 err = 0;
380 out:
381 return err;
382 }
383
384 /**
385 * range_is_zero - test whether buffer is initialized
386 * @buf: buffer to check
387 * @from: check from this position
388 * @to: check up until (excluding) this position
389 *
390 * This function returns true if the there is a non-zero byte
391 * in the buf in the range [from,to).
392 */
range_is_zero(void * buf,size_t from,size_t to)393 static inline bool range_is_zero(void *buf, size_t from, size_t to)
394 {
395 return !memchr_inv((u8 *)buf + from, 0, to - from);
396 }
397
convert___skb_to_skb(struct sk_buff * skb,struct __sk_buff * __skb)398 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
399 {
400 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
401
402 if (!__skb)
403 return 0;
404
405 /* make sure the fields we don't use are zeroed */
406 if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
407 return -EINVAL;
408
409 /* mark is allowed */
410
411 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
412 offsetof(struct __sk_buff, priority)))
413 return -EINVAL;
414
415 /* priority is allowed */
416
417 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, priority),
418 offsetof(struct __sk_buff, ifindex)))
419 return -EINVAL;
420
421 /* ifindex is allowed */
422
423 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
424 offsetof(struct __sk_buff, cb)))
425 return -EINVAL;
426
427 /* cb is allowed */
428
429 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
430 offsetof(struct __sk_buff, tstamp)))
431 return -EINVAL;
432
433 /* tstamp is allowed */
434 /* wire_len is allowed */
435 /* gso_segs is allowed */
436
437 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
438 offsetof(struct __sk_buff, gso_size)))
439 return -EINVAL;
440
441 /* gso_size is allowed */
442
443 if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
444 sizeof(struct __sk_buff)))
445 return -EINVAL;
446
447 skb->mark = __skb->mark;
448 skb->priority = __skb->priority;
449 skb->tstamp = __skb->tstamp;
450 memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
451
452 if (__skb->wire_len == 0) {
453 cb->pkt_len = skb->len;
454 } else {
455 if (__skb->wire_len < skb->len ||
456 __skb->wire_len > GSO_MAX_SIZE)
457 return -EINVAL;
458 cb->pkt_len = __skb->wire_len;
459 }
460
461 if (__skb->gso_segs > GSO_MAX_SEGS)
462 return -EINVAL;
463 skb_shinfo(skb)->gso_segs = __skb->gso_segs;
464 skb_shinfo(skb)->gso_size = __skb->gso_size;
465
466 return 0;
467 }
468
convert_skb_to___skb(struct sk_buff * skb,struct __sk_buff * __skb)469 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
470 {
471 struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
472
473 if (!__skb)
474 return;
475
476 __skb->mark = skb->mark;
477 __skb->priority = skb->priority;
478 __skb->ifindex = skb->dev->ifindex;
479 __skb->tstamp = skb->tstamp;
480 memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
481 __skb->wire_len = cb->pkt_len;
482 __skb->gso_segs = skb_shinfo(skb)->gso_segs;
483 }
484
485 static struct proto bpf_dummy_proto = {
486 .name = "bpf_dummy",
487 .owner = THIS_MODULE,
488 .obj_size = sizeof(struct sock),
489 };
490
bpf_prog_test_run_skb(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)491 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
492 union bpf_attr __user *uattr)
493 {
494 bool is_l2 = false, is_direct_pkt_access = false;
495 struct net *net = current->nsproxy->net_ns;
496 struct net_device *dev = net->loopback_dev;
497 u32 size = kattr->test.data_size_in;
498 u32 repeat = kattr->test.repeat;
499 struct __sk_buff *ctx = NULL;
500 u32 retval, duration;
501 int hh_len = ETH_HLEN;
502 struct sk_buff *skb;
503 struct sock *sk;
504 void *data;
505 int ret;
506
507 if (kattr->test.flags || kattr->test.cpu)
508 return -EINVAL;
509
510 data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
511 SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
512 if (IS_ERR(data))
513 return PTR_ERR(data);
514
515 ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
516 if (IS_ERR(ctx)) {
517 kfree(data);
518 return PTR_ERR(ctx);
519 }
520
521 switch (prog->type) {
522 case BPF_PROG_TYPE_SCHED_CLS:
523 case BPF_PROG_TYPE_SCHED_ACT:
524 is_l2 = true;
525 fallthrough;
526 case BPF_PROG_TYPE_LWT_IN:
527 case BPF_PROG_TYPE_LWT_OUT:
528 case BPF_PROG_TYPE_LWT_XMIT:
529 is_direct_pkt_access = true;
530 break;
531 default:
532 break;
533 }
534
535 sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
536 if (!sk) {
537 kfree(data);
538 kfree(ctx);
539 return -ENOMEM;
540 }
541 sock_init_data(NULL, sk);
542
543 skb = build_skb(data, 0);
544 if (!skb) {
545 kfree(data);
546 kfree(ctx);
547 sk_free(sk);
548 return -ENOMEM;
549 }
550 skb->sk = sk;
551
552 skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
553 __skb_put(skb, size);
554 if (ctx && ctx->ifindex > 1) {
555 dev = dev_get_by_index(net, ctx->ifindex);
556 if (!dev) {
557 ret = -ENODEV;
558 goto out;
559 }
560 }
561 skb->protocol = eth_type_trans(skb, dev);
562 skb_reset_network_header(skb);
563
564 switch (skb->protocol) {
565 case htons(ETH_P_IP):
566 sk->sk_family = AF_INET;
567 if (sizeof(struct iphdr) <= skb_headlen(skb)) {
568 sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
569 sk->sk_daddr = ip_hdr(skb)->daddr;
570 }
571 break;
572 #if IS_ENABLED(CONFIG_IPV6)
573 case htons(ETH_P_IPV6):
574 sk->sk_family = AF_INET6;
575 if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
576 sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
577 sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
578 }
579 break;
580 #endif
581 default:
582 break;
583 }
584
585 if (is_l2)
586 __skb_push(skb, hh_len);
587 if (is_direct_pkt_access)
588 bpf_compute_data_pointers(skb);
589 ret = convert___skb_to_skb(skb, ctx);
590 if (ret)
591 goto out;
592 ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
593 if (ret)
594 goto out;
595 if (!is_l2) {
596 if (skb_headroom(skb) < hh_len) {
597 int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
598
599 if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
600 ret = -ENOMEM;
601 goto out;
602 }
603 }
604 memset(__skb_push(skb, hh_len), 0, hh_len);
605 }
606 convert_skb_to___skb(skb, ctx);
607
608 size = skb->len;
609 /* bpf program can never convert linear skb to non-linear */
610 if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
611 size = skb_headlen(skb);
612 ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
613 if (!ret)
614 ret = bpf_ctx_finish(kattr, uattr, ctx,
615 sizeof(struct __sk_buff));
616 out:
617 if (dev && dev != net->loopback_dev)
618 dev_put(dev);
619 kfree_skb(skb);
620 sk_free(sk);
621 kfree(ctx);
622 return ret;
623 }
624
bpf_prog_test_run_xdp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)625 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
626 union bpf_attr __user *uattr)
627 {
628 u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
629 u32 headroom = XDP_PACKET_HEADROOM;
630 u32 size = kattr->test.data_size_in;
631 u32 repeat = kattr->test.repeat;
632 struct netdev_rx_queue *rxqueue;
633 struct xdp_buff xdp = {};
634 u32 retval, duration;
635 u32 max_data_sz;
636 void *data;
637 int ret;
638
639 if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
640 prog->expected_attach_type == BPF_XDP_CPUMAP)
641 return -EINVAL;
642 if (kattr->test.ctx_in || kattr->test.ctx_out)
643 return -EINVAL;
644
645 /* XDP have extra tailroom as (most) drivers use full page */
646 max_data_sz = 4096 - headroom - tailroom;
647
648 data = bpf_test_init(kattr, max_data_sz, headroom, tailroom);
649 if (IS_ERR(data))
650 return PTR_ERR(data);
651
652 xdp.data_hard_start = data;
653 xdp.data = data + headroom;
654 xdp.data_meta = xdp.data;
655 xdp.data_end = xdp.data + size;
656 xdp.frame_sz = headroom + max_data_sz + tailroom;
657
658 rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
659 xdp.rxq = &rxqueue->xdp_rxq;
660 bpf_prog_change_xdp(NULL, prog);
661 ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
662 if (ret)
663 goto out;
664 if (xdp.data != data + headroom || xdp.data_end != xdp.data + size)
665 size = xdp.data_end - xdp.data;
666 ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
667 out:
668 bpf_prog_change_xdp(prog, NULL);
669 kfree(data);
670 return ret;
671 }
672
verify_user_bpf_flow_keys(struct bpf_flow_keys * ctx)673 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
674 {
675 /* make sure the fields we don't use are zeroed */
676 if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
677 return -EINVAL;
678
679 /* flags is allowed */
680
681 if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
682 sizeof(struct bpf_flow_keys)))
683 return -EINVAL;
684
685 return 0;
686 }
687
bpf_prog_test_run_flow_dissector(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)688 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
689 const union bpf_attr *kattr,
690 union bpf_attr __user *uattr)
691 {
692 u32 size = kattr->test.data_size_in;
693 struct bpf_flow_dissector ctx = {};
694 u32 repeat = kattr->test.repeat;
695 struct bpf_flow_keys *user_ctx;
696 struct bpf_flow_keys flow_keys;
697 u64 time_start, time_spent = 0;
698 const struct ethhdr *eth;
699 unsigned int flags = 0;
700 u32 retval, duration;
701 void *data;
702 int ret;
703 u32 i;
704
705 if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR)
706 return -EINVAL;
707
708 if (kattr->test.flags || kattr->test.cpu)
709 return -EINVAL;
710
711 if (size < ETH_HLEN)
712 return -EINVAL;
713
714 data = bpf_test_init(kattr, size, 0, 0);
715 if (IS_ERR(data))
716 return PTR_ERR(data);
717
718 eth = (struct ethhdr *)data;
719
720 if (!repeat)
721 repeat = 1;
722
723 user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
724 if (IS_ERR(user_ctx)) {
725 kfree(data);
726 return PTR_ERR(user_ctx);
727 }
728 if (user_ctx) {
729 ret = verify_user_bpf_flow_keys(user_ctx);
730 if (ret)
731 goto out;
732 flags = user_ctx->flags;
733 }
734
735 ctx.flow_keys = &flow_keys;
736 ctx.data = data;
737 ctx.data_end = (__u8 *)data + size;
738
739 rcu_read_lock();
740 preempt_disable();
741 time_start = ktime_get_ns();
742 for (i = 0; i < repeat; i++) {
743 retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
744 size, flags);
745
746 if (signal_pending(current)) {
747 preempt_enable();
748 rcu_read_unlock();
749
750 ret = -EINTR;
751 goto out;
752 }
753
754 if (need_resched()) {
755 time_spent += ktime_get_ns() - time_start;
756 preempt_enable();
757 rcu_read_unlock();
758
759 cond_resched();
760
761 rcu_read_lock();
762 preempt_disable();
763 time_start = ktime_get_ns();
764 }
765 }
766 time_spent += ktime_get_ns() - time_start;
767 preempt_enable();
768 rcu_read_unlock();
769
770 do_div(time_spent, repeat);
771 duration = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;
772
773 ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
774 retval, duration);
775 if (!ret)
776 ret = bpf_ctx_finish(kattr, uattr, user_ctx,
777 sizeof(struct bpf_flow_keys));
778
779 out:
780 kfree(user_ctx);
781 kfree(data);
782 return ret;
783 }
784