xref: /linux/net/bpf/test_run.c (revision d303caf5caf453da2abfd84d249d210aaffe9873)
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/hotdata.h>
16 #include <net/sock.h>
17 #include <net/tcp.h>
18 #include <net/net_namespace.h>
19 #include <net/page_pool/helpers.h>
20 #include <linux/error-injection.h>
21 #include <linux/smp.h>
22 #include <linux/sock_diag.h>
23 #include <linux/netfilter.h>
24 #include <net/netdev_rx_queue.h>
25 #include <net/xdp.h>
26 #include <net/netfilter/nf_bpf_link.h>
27 
28 #define CREATE_TRACE_POINTS
29 #include <trace/events/bpf_test_run.h>
30 
31 struct bpf_test_timer {
32 	u32 i;
33 	u64 time_start, time_spent;
34 };
35 
bpf_test_timer_enter(struct bpf_test_timer * t)36 static void bpf_test_timer_enter(struct bpf_test_timer *t)
37 	__acquires(rcu)
38 {
39 	rcu_read_lock_dont_migrate();
40 	t->time_start = ktime_get_ns();
41 }
42 
bpf_test_timer_leave(struct bpf_test_timer * t)43 static void bpf_test_timer_leave(struct bpf_test_timer *t)
44 	__releases(rcu)
45 {
46 	t->time_start = 0;
47 	rcu_read_unlock_migrate();
48 }
49 
bpf_test_timer_continue(struct bpf_test_timer * t,int iterations,u32 repeat,int * err,u32 * duration)50 static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iterations,
51 				    u32 repeat, int *err, u32 *duration)
52 	__must_hold(rcu)
53 {
54 	t->i += iterations;
55 	if (t->i >= repeat) {
56 		/* We're done. */
57 		t->time_spent += ktime_get_ns() - t->time_start;
58 		do_div(t->time_spent, t->i);
59 		*duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent;
60 		*err = 0;
61 		goto reset;
62 	}
63 
64 	if (signal_pending(current)) {
65 		/* During iteration: we've been cancelled, abort. */
66 		*err = -EINTR;
67 		goto reset;
68 	}
69 
70 	if (need_resched()) {
71 		/* During iteration: we need to reschedule between runs. */
72 		t->time_spent += ktime_get_ns() - t->time_start;
73 		bpf_test_timer_leave(t);
74 		cond_resched();
75 		bpf_test_timer_enter(t);
76 	}
77 
78 	/* Do another round. */
79 	return true;
80 
81 reset:
82 	t->i = 0;
83 	return false;
84 }
85 
86 /* We put this struct at the head of each page with a context and frame
87  * initialised when the page is allocated, so we don't have to do this on each
88  * repetition of the test run.
89  */
90 struct xdp_page_head {
91 	struct xdp_buff orig_ctx;
92 	struct xdp_buff ctx;
93 	union {
94 		/* ::data_hard_start starts here */
95 		DECLARE_FLEX_ARRAY(struct xdp_frame, frame);
96 		DECLARE_FLEX_ARRAY(u8, data);
97 	};
98 };
99 
100 struct xdp_test_data {
101 	struct xdp_buff *orig_ctx;
102 	struct xdp_rxq_info rxq;
103 	struct net_device *dev;
104 	struct page_pool *pp;
105 	struct xdp_frame **frames;
106 	struct sk_buff **skbs;
107 	struct xdp_mem_info mem;
108 	u32 batch_size;
109 	u32 frame_cnt;
110 };
111 
112 /* tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c:%MAX_PKT_SIZE
113  * must be updated accordingly this gets changed, otherwise BPF selftests
114  * will fail.
115  */
116 #define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head))
117 #define TEST_XDP_MAX_BATCH 256
118 
xdp_test_run_init_page(netmem_ref netmem,void * arg)119 static void xdp_test_run_init_page(netmem_ref netmem, void *arg)
120 {
121 	struct xdp_page_head *head =
122 		phys_to_virt(page_to_phys(netmem_to_page(netmem)));
123 	struct xdp_buff *new_ctx, *orig_ctx;
124 	u32 headroom = XDP_PACKET_HEADROOM;
125 	struct xdp_test_data *xdp = arg;
126 	size_t frm_len, meta_len;
127 	struct xdp_frame *frm;
128 	void *data;
129 
130 	orig_ctx = xdp->orig_ctx;
131 	frm_len = orig_ctx->data_end - orig_ctx->data_meta;
132 	meta_len = orig_ctx->data - orig_ctx->data_meta;
133 	headroom -= meta_len;
134 
135 	new_ctx = &head->ctx;
136 	frm = head->frame;
137 	data = head->data;
138 	memcpy(data + headroom, orig_ctx->data_meta, frm_len);
139 
140 	xdp_init_buff(new_ctx, TEST_XDP_FRAME_SIZE, &xdp->rxq);
141 	xdp_prepare_buff(new_ctx, data, headroom, frm_len, true);
142 	new_ctx->data = new_ctx->data_meta + meta_len;
143 
144 	xdp_update_frame_from_buff(new_ctx, frm);
145 	frm->mem_type = new_ctx->rxq->mem.type;
146 
147 	memcpy(&head->orig_ctx, new_ctx, sizeof(head->orig_ctx));
148 }
149 
xdp_test_run_setup(struct xdp_test_data * xdp,struct xdp_buff * orig_ctx)150 static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_ctx)
151 {
152 	struct page_pool *pp;
153 	int err = -ENOMEM;
154 	struct page_pool_params pp_params = {
155 		.order = 0,
156 		.flags = 0,
157 		.pool_size = xdp->batch_size,
158 		.nid = NUMA_NO_NODE,
159 		.init_callback = xdp_test_run_init_page,
160 		.init_arg = xdp,
161 	};
162 
163 	xdp->frames = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
164 	if (!xdp->frames)
165 		return -ENOMEM;
166 
167 	xdp->skbs = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
168 	if (!xdp->skbs)
169 		goto err_skbs;
170 
171 	pp = page_pool_create(&pp_params);
172 	if (IS_ERR(pp)) {
173 		err = PTR_ERR(pp);
174 		goto err_pp;
175 	}
176 
177 	/* will copy 'mem.id' into pp->xdp_mem_id */
178 	err = xdp_reg_mem_model(&xdp->mem, MEM_TYPE_PAGE_POOL, pp);
179 	if (err)
180 		goto err_mmodel;
181 
182 	xdp->pp = pp;
183 
184 	/* We create a 'fake' RXQ referencing the original dev, but with an
185 	 * xdp_mem_info pointing to our page_pool
186 	 */
187 	xdp_rxq_info_reg(&xdp->rxq, orig_ctx->rxq->dev, 0, 0);
188 	xdp->rxq.mem.type = MEM_TYPE_PAGE_POOL;
189 	xdp->rxq.mem.id = pp->xdp_mem_id;
190 	xdp->dev = orig_ctx->rxq->dev;
191 	xdp->orig_ctx = orig_ctx;
192 
193 	return 0;
194 
195 err_mmodel:
196 	page_pool_destroy(pp);
197 err_pp:
198 	kvfree(xdp->skbs);
199 err_skbs:
200 	kvfree(xdp->frames);
201 	return err;
202 }
203 
xdp_test_run_teardown(struct xdp_test_data * xdp)204 static void xdp_test_run_teardown(struct xdp_test_data *xdp)
205 {
206 	xdp_unreg_mem_model(&xdp->mem);
207 	page_pool_destroy(xdp->pp);
208 	kfree(xdp->frames);
209 	kfree(xdp->skbs);
210 }
211 
frame_was_changed(const struct xdp_page_head * head)212 static bool frame_was_changed(const struct xdp_page_head *head)
213 {
214 	/* xdp_scrub_frame() zeroes the data pointer, flags is the last field,
215 	 * i.e. has the highest chances to be overwritten. If those two are
216 	 * untouched, it's most likely safe to skip the context reset.
217 	 */
218 	return head->frame->data != head->orig_ctx.data ||
219 	       head->frame->flags != head->orig_ctx.flags;
220 }
221 
ctx_was_changed(struct xdp_page_head * head)222 static bool ctx_was_changed(struct xdp_page_head *head)
223 {
224 	return head->orig_ctx.data != head->ctx.data ||
225 		head->orig_ctx.data_meta != head->ctx.data_meta ||
226 		head->orig_ctx.data_end != head->ctx.data_end;
227 }
228 
reset_ctx(struct xdp_page_head * head)229 static void reset_ctx(struct xdp_page_head *head)
230 {
231 	if (likely(!frame_was_changed(head) && !ctx_was_changed(head)))
232 		return;
233 
234 	head->ctx.data = head->orig_ctx.data;
235 	head->ctx.data_meta = head->orig_ctx.data_meta;
236 	head->ctx.data_end = head->orig_ctx.data_end;
237 	xdp_update_frame_from_buff(&head->ctx, head->frame);
238 	head->frame->mem_type = head->orig_ctx.rxq->mem.type;
239 }
240 
xdp_recv_frames(struct xdp_frame ** frames,int nframes,struct sk_buff ** skbs,struct net_device * dev)241 static int xdp_recv_frames(struct xdp_frame **frames, int nframes,
242 			   struct sk_buff **skbs,
243 			   struct net_device *dev)
244 {
245 	gfp_t gfp = __GFP_ZERO | GFP_ATOMIC;
246 	int i, n;
247 	LIST_HEAD(list);
248 
249 	n = kmem_cache_alloc_bulk(net_hotdata.skbuff_cache, gfp, nframes,
250 				  (void **)skbs);
251 	if (unlikely(n == 0)) {
252 		for (i = 0; i < nframes; i++)
253 			xdp_return_frame(frames[i]);
254 		return -ENOMEM;
255 	}
256 
257 	for (i = 0; i < nframes; i++) {
258 		struct xdp_frame *xdpf = frames[i];
259 		struct sk_buff *skb = skbs[i];
260 
261 		skb = __xdp_build_skb_from_frame(xdpf, skb, dev);
262 		if (!skb) {
263 			xdp_return_frame(xdpf);
264 			continue;
265 		}
266 
267 		list_add_tail(&skb->list, &list);
268 	}
269 	netif_receive_skb_list(&list);
270 
271 	return 0;
272 }
273 
xdp_test_run_batch(struct xdp_test_data * xdp,struct bpf_prog * prog,u32 repeat)274 static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog *prog,
275 			      u32 repeat)
276 {
277 	struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
278 	int err = 0, act, ret, i, nframes = 0, batch_sz;
279 	struct xdp_frame **frames = xdp->frames;
280 	struct bpf_redirect_info *ri;
281 	struct xdp_page_head *head;
282 	struct xdp_frame *frm;
283 	bool redirect = false;
284 	struct xdp_buff *ctx;
285 	struct page *page;
286 
287 	batch_sz = min_t(u32, repeat, xdp->batch_size);
288 
289 	local_bh_disable();
290 	bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);
291 	ri = bpf_net_ctx_get_ri();
292 	xdp_set_return_frame_no_direct();
293 
294 	for (i = 0; i < batch_sz; i++) {
295 		page = page_pool_dev_alloc_pages(xdp->pp);
296 		if (!page) {
297 			err = -ENOMEM;
298 			goto out;
299 		}
300 
301 		head = phys_to_virt(page_to_phys(page));
302 		reset_ctx(head);
303 		ctx = &head->ctx;
304 		frm = head->frame;
305 		xdp->frame_cnt++;
306 
307 		act = bpf_prog_run_xdp(prog, ctx);
308 
309 		/* if program changed pkt bounds we need to update the xdp_frame */
310 		if (unlikely(ctx_was_changed(head))) {
311 			ret = xdp_update_frame_from_buff(ctx, frm);
312 			if (ret) {
313 				xdp_return_buff(ctx);
314 				continue;
315 			}
316 		}
317 
318 		switch (act) {
319 		case XDP_TX:
320 			/* we can't do a real XDP_TX since we're not in the
321 			 * driver, so turn it into a REDIRECT back to the same
322 			 * index
323 			 */
324 			ri->tgt_index = xdp->dev->ifindex;
325 			ri->map_id = INT_MAX;
326 			ri->map_type = BPF_MAP_TYPE_UNSPEC;
327 			fallthrough;
328 		case XDP_REDIRECT:
329 			redirect = true;
330 			ret = xdp_do_redirect_frame(xdp->dev, ctx, frm, prog);
331 			if (ret)
332 				xdp_return_buff(ctx);
333 			break;
334 		case XDP_PASS:
335 			frames[nframes++] = frm;
336 			break;
337 		default:
338 			bpf_warn_invalid_xdp_action(NULL, prog, act);
339 			fallthrough;
340 		case XDP_DROP:
341 			xdp_return_buff(ctx);
342 			break;
343 		}
344 	}
345 
346 out:
347 	if (redirect)
348 		xdp_do_flush();
349 	if (nframes) {
350 		ret = xdp_recv_frames(frames, nframes, xdp->skbs, xdp->dev);
351 		if (ret)
352 			err = ret;
353 	}
354 
355 	xdp_clear_return_frame_no_direct();
356 	bpf_net_ctx_clear(bpf_net_ctx);
357 	local_bh_enable();
358 	return err;
359 }
360 
bpf_test_run_xdp_live(struct bpf_prog * prog,struct xdp_buff * ctx,u32 repeat,u32 batch_size,u32 * time)361 static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx,
362 				 u32 repeat, u32 batch_size, u32 *time)
363 
364 {
365 	struct xdp_test_data xdp = { .batch_size = batch_size };
366 	struct bpf_test_timer t = {};
367 	int ret;
368 
369 	if (!repeat)
370 		repeat = 1;
371 
372 	ret = xdp_test_run_setup(&xdp, ctx);
373 	if (ret)
374 		return ret;
375 
376 	bpf_test_timer_enter(&t);
377 	do {
378 		xdp.frame_cnt = 0;
379 		ret = xdp_test_run_batch(&xdp, prog, repeat - t.i);
380 		if (unlikely(ret < 0))
381 			break;
382 	} while (bpf_test_timer_continue(&t, xdp.frame_cnt, repeat, &ret, time));
383 	bpf_test_timer_leave(&t);
384 
385 	xdp_test_run_teardown(&xdp);
386 	return ret;
387 }
388 
bpf_test_run(struct bpf_prog * prog,void * ctx,u32 repeat,u32 * retval,u32 * time,bool xdp)389 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
390 			u32 *retval, u32 *time, bool xdp)
391 {
392 	struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
393 	struct bpf_prog_array_item item = {.prog = prog};
394 	struct bpf_run_ctx *old_ctx;
395 	struct bpf_cg_run_ctx run_ctx;
396 	struct bpf_test_timer t = {};
397 	enum bpf_cgroup_storage_type stype;
398 	int ret;
399 
400 	for_each_cgroup_storage_type(stype) {
401 		item.cgroup_storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
402 		if (IS_ERR(item.cgroup_storage[stype])) {
403 			item.cgroup_storage[stype] = NULL;
404 			for_each_cgroup_storage_type(stype)
405 				bpf_cgroup_storage_free(item.cgroup_storage[stype]);
406 			return -ENOMEM;
407 		}
408 	}
409 
410 	if (!repeat)
411 		repeat = 1;
412 
413 	bpf_test_timer_enter(&t);
414 	old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
415 	do {
416 		run_ctx.prog_item = &item;
417 		local_bh_disable();
418 		bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);
419 
420 		if (xdp)
421 			*retval = bpf_prog_run_xdp(prog, ctx);
422 		else
423 			*retval = bpf_prog_run(prog, ctx);
424 
425 		bpf_net_ctx_clear(bpf_net_ctx);
426 		local_bh_enable();
427 	} while (bpf_test_timer_continue(&t, 1, repeat, &ret, time));
428 	bpf_reset_run_ctx(old_ctx);
429 	bpf_test_timer_leave(&t);
430 
431 	for_each_cgroup_storage_type(stype)
432 		bpf_cgroup_storage_free(item.cgroup_storage[stype]);
433 
434 	return ret;
435 }
436 
bpf_test_finish(const union bpf_attr * kattr,union bpf_attr __user * uattr,const void * data,struct skb_shared_info * sinfo,u32 size,u32 retval,u32 duration)437 static int bpf_test_finish(const union bpf_attr *kattr,
438 			   union bpf_attr __user *uattr, const void *data,
439 			   struct skb_shared_info *sinfo, u32 size,
440 			   u32 retval, u32 duration)
441 {
442 	void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
443 	int err = -EFAULT;
444 	u32 copy_size = size;
445 
446 	/* Clamp copy if the user has provided a size hint, but copy the full
447 	 * buffer if not to retain old behaviour.
448 	 */
449 	if (kattr->test.data_size_out &&
450 	    copy_size > kattr->test.data_size_out) {
451 		copy_size = kattr->test.data_size_out;
452 		err = -ENOSPC;
453 	}
454 
455 	if (data_out) {
456 		int len = sinfo ? copy_size - sinfo->xdp_frags_size : copy_size;
457 
458 		if (len < 0) {
459 			err = -ENOSPC;
460 			goto out;
461 		}
462 
463 		if (copy_to_user(data_out, data, len))
464 			goto out;
465 
466 		if (sinfo) {
467 			int i, offset = len;
468 			u32 data_len;
469 
470 			for (i = 0; i < sinfo->nr_frags; i++) {
471 				skb_frag_t *frag = &sinfo->frags[i];
472 
473 				if (offset >= copy_size) {
474 					err = -ENOSPC;
475 					break;
476 				}
477 
478 				data_len = min_t(u32, copy_size - offset,
479 						 skb_frag_size(frag));
480 
481 				if (copy_to_user(data_out + offset,
482 						 skb_frag_address(frag),
483 						 data_len))
484 					goto out;
485 
486 				offset += data_len;
487 			}
488 		}
489 	}
490 
491 	if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
492 		goto out;
493 	if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
494 		goto out;
495 	if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
496 		goto out;
497 	if (err != -ENOSPC)
498 		err = 0;
499 out:
500 	trace_bpf_test_finish(&err);
501 	return err;
502 }
503 
504 /* Integer types of various sizes and pointer combinations cover variety of
505  * architecture dependent calling conventions. 7+ can be supported in the
506  * future.
507  */
508 __bpf_kfunc_start_defs();
509 
bpf_fentry_test1(int a)510 __bpf_kfunc int bpf_fentry_test1(int a)
511 {
512 	return a + 1;
513 }
514 EXPORT_SYMBOL_GPL(bpf_fentry_test1);
515 
bpf_fentry_test2(int a,u64 b)516 noinline int bpf_fentry_test2(int a, u64 b)
517 {
518 	return a + b;
519 }
520 
bpf_fentry_test3(char a,int b,u64 c)521 noinline int bpf_fentry_test3(char a, int b, u64 c)
522 {
523 	return a + b + c;
524 }
525 
bpf_fentry_test4(void * a,char b,int c,u64 d)526 noinline int bpf_fentry_test4(void *a, char b, int c, u64 d)
527 {
528 	return (long)a + b + c + d;
529 }
530 
bpf_fentry_test5(u64 a,void * b,short c,int d,u64 e)531 noinline int bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
532 {
533 	return a + (long)b + c + d + e;
534 }
535 
bpf_fentry_test6(u64 a,void * b,short c,int d,void * e,u64 f)536 noinline int bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
537 {
538 	return a + (long)b + c + d + (long)e + f;
539 }
540 
541 struct bpf_fentry_test_t {
542 	struct bpf_fentry_test_t *a;
543 };
544 
bpf_fentry_test7(struct bpf_fentry_test_t * arg)545 noinline int bpf_fentry_test7(struct bpf_fentry_test_t *arg)
546 {
547 	asm volatile ("" : "+r"(arg));
548 	return (long)arg;
549 }
550 
bpf_fentry_test8(struct bpf_fentry_test_t * arg)551 noinline int bpf_fentry_test8(struct bpf_fentry_test_t *arg)
552 {
553 	return (long)arg->a;
554 }
555 
bpf_fentry_test9(u32 * a)556 __bpf_kfunc u32 bpf_fentry_test9(u32 *a)
557 {
558 	return *a;
559 }
560 
bpf_fentry_test10(const void * a)561 noinline int bpf_fentry_test10(const void *a)
562 {
563 	return (long)a;
564 }
565 
bpf_fentry_test_sinfo(struct skb_shared_info * sinfo)566 noinline void bpf_fentry_test_sinfo(struct skb_shared_info *sinfo)
567 {
568 }
569 
bpf_modify_return_test(int a,int * b)570 __bpf_kfunc int bpf_modify_return_test(int a, int *b)
571 {
572 	*b += 1;
573 	return a + *b;
574 }
575 
bpf_modify_return_test2(int a,int * b,short c,int d,void * e,char f,int g)576 __bpf_kfunc int bpf_modify_return_test2(int a, int *b, short c, int d,
577 					void *e, char f, int g)
578 {
579 	*b += 1;
580 	return a + *b + c + d + (long)e + f + g;
581 }
582 
bpf_modify_return_test_tp(int nonce)583 __bpf_kfunc int bpf_modify_return_test_tp(int nonce)
584 {
585 	trace_bpf_trigger_tp(nonce);
586 
587 	return nonce;
588 }
589 
bpf_fentry_shadow_test(int a)590 noinline int bpf_fentry_shadow_test(int a)
591 {
592 	return a + 1;
593 }
594 
595 struct prog_test_member1 {
596 	int a;
597 };
598 
599 struct prog_test_member {
600 	struct prog_test_member1 m;
601 	int c;
602 };
603 
604 struct prog_test_ref_kfunc {
605 	int a;
606 	int b;
607 	struct prog_test_member memb;
608 	struct prog_test_ref_kfunc *next;
609 	refcount_t cnt;
610 };
611 
bpf_kfunc_call_test_release(struct prog_test_ref_kfunc * p)612 __bpf_kfunc void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p)
613 {
614 	refcount_dec(&p->cnt);
615 }
616 
bpf_kfunc_call_test_release_dtor(void * p)617 __bpf_kfunc void bpf_kfunc_call_test_release_dtor(void *p)
618 {
619 	bpf_kfunc_call_test_release(p);
620 }
621 CFI_NOSEAL(bpf_kfunc_call_test_release_dtor);
622 
bpf_kfunc_call_memb_release(struct prog_test_member * p)623 __bpf_kfunc void bpf_kfunc_call_memb_release(struct prog_test_member *p)
624 {
625 }
626 
bpf_kfunc_call_memb_release_dtor(void * p)627 __bpf_kfunc void bpf_kfunc_call_memb_release_dtor(void *p)
628 {
629 }
630 CFI_NOSEAL(bpf_kfunc_call_memb_release_dtor);
631 
632 __bpf_kfunc_end_defs();
633 
634 BTF_KFUNCS_START(bpf_test_modify_return_ids)
635 BTF_ID_FLAGS(func, bpf_modify_return_test)
636 BTF_ID_FLAGS(func, bpf_modify_return_test2)
637 BTF_ID_FLAGS(func, bpf_modify_return_test_tp)
638 BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE)
639 BTF_KFUNCS_END(bpf_test_modify_return_ids)
640 
641 static const struct btf_kfunc_id_set bpf_test_modify_return_set = {
642 	.owner = THIS_MODULE,
643 	.set   = &bpf_test_modify_return_ids,
644 };
645 
646 BTF_KFUNCS_START(test_sk_check_kfunc_ids)
BTF_ID_FLAGS(func,bpf_kfunc_call_test_release,KF_RELEASE)647 BTF_ID_FLAGS(func, bpf_kfunc_call_test_release, KF_RELEASE)
648 BTF_ID_FLAGS(func, bpf_kfunc_call_memb_release, KF_RELEASE)
649 BTF_KFUNCS_END(test_sk_check_kfunc_ids)
650 
651 static void *bpf_test_init(const union bpf_attr *kattr, u32 user_size,
652 			   u32 size, u32 headroom, u32 tailroom)
653 {
654 	void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
655 	void *data;
656 
657 	if (user_size > PAGE_SIZE - headroom - tailroom)
658 		return ERR_PTR(-EINVAL);
659 
660 	size = SKB_DATA_ALIGN(size);
661 	data = kzalloc(size + headroom + tailroom, GFP_USER);
662 	if (!data)
663 		return ERR_PTR(-ENOMEM);
664 
665 	if (copy_from_user(data + headroom, data_in, user_size)) {
666 		kfree(data);
667 		return ERR_PTR(-EFAULT);
668 	}
669 
670 	return data;
671 }
672 
bpf_prog_test_run_tracing(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)673 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
674 			      const union bpf_attr *kattr,
675 			      union bpf_attr __user *uattr)
676 {
677 	struct bpf_fentry_test_t arg = {};
678 	u16 side_effect = 0, ret = 0;
679 	int b = 2, err = -EFAULT;
680 	u32 retval = 0;
681 
682 	if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
683 		return -EINVAL;
684 
685 	switch (prog->expected_attach_type) {
686 	case BPF_TRACE_FENTRY:
687 	case BPF_TRACE_FEXIT:
688 		if (bpf_fentry_test1(1) != 2 ||
689 		    bpf_fentry_test2(2, 3) != 5 ||
690 		    bpf_fentry_test3(4, 5, 6) != 15 ||
691 		    bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
692 		    bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
693 		    bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
694 		    bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
695 		    bpf_fentry_test8(&arg) != 0 ||
696 		    bpf_fentry_test9(&retval) != 0 ||
697 		    bpf_fentry_test10((void *)0) != 0)
698 			goto out;
699 		break;
700 	case BPF_MODIFY_RETURN:
701 		ret = bpf_modify_return_test(1, &b);
702 		if (b != 2)
703 			side_effect++;
704 		b = 2;
705 		ret += bpf_modify_return_test2(1, &b, 3, 4, (void *)5, 6, 7);
706 		if (b != 2)
707 			side_effect++;
708 		break;
709 	default:
710 		goto out;
711 	}
712 
713 	retval = ((u32)side_effect << 16) | ret;
714 	if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
715 		goto out;
716 
717 	err = 0;
718 out:
719 	trace_bpf_test_finish(&err);
720 	return err;
721 }
722 
723 struct bpf_raw_tp_test_run_info {
724 	struct bpf_prog *prog;
725 	void *ctx;
726 	u32 retval;
727 };
728 
729 static void
__bpf_prog_test_run_raw_tp(void * data)730 __bpf_prog_test_run_raw_tp(void *data)
731 {
732 	struct bpf_raw_tp_test_run_info *info = data;
733 	struct bpf_trace_run_ctx run_ctx = {};
734 	struct bpf_run_ctx *old_run_ctx;
735 
736 	old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
737 
738 	rcu_read_lock();
739 	info->retval = bpf_prog_run(info->prog, info->ctx);
740 	rcu_read_unlock();
741 
742 	bpf_reset_run_ctx(old_run_ctx);
743 }
744 
bpf_prog_test_run_raw_tp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)745 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
746 			     const union bpf_attr *kattr,
747 			     union bpf_attr __user *uattr)
748 {
749 	void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
750 	__u32 ctx_size_in = kattr->test.ctx_size_in;
751 	struct bpf_raw_tp_test_run_info info;
752 	int cpu = kattr->test.cpu, err = 0;
753 	int current_cpu;
754 
755 	/* doesn't support data_in/out, ctx_out, duration, or repeat */
756 	if (kattr->test.data_in || kattr->test.data_out ||
757 	    kattr->test.ctx_out || kattr->test.duration ||
758 	    kattr->test.repeat || kattr->test.batch_size)
759 		return -EINVAL;
760 
761 	if (ctx_size_in < prog->aux->max_ctx_offset ||
762 	    ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
763 		return -EINVAL;
764 
765 	if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
766 		return -EINVAL;
767 
768 	if (ctx_size_in) {
769 		info.ctx = memdup_user(ctx_in, ctx_size_in);
770 		if (IS_ERR(info.ctx))
771 			return PTR_ERR(info.ctx);
772 	} else {
773 		info.ctx = NULL;
774 	}
775 
776 	info.prog = prog;
777 
778 	current_cpu = get_cpu();
779 	if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 ||
780 	    cpu == current_cpu) {
781 		__bpf_prog_test_run_raw_tp(&info);
782 	} else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
783 		/* smp_call_function_single() also checks cpu_online()
784 		 * after csd_lock(). However, since cpu is from user
785 		 * space, let's do an extra quick check to filter out
786 		 * invalid value before smp_call_function_single().
787 		 */
788 		err = -ENXIO;
789 	} else {
790 		err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
791 					       &info, 1);
792 	}
793 	put_cpu();
794 
795 	if (!err &&
796 	    copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
797 		err = -EFAULT;
798 
799 	kfree(info.ctx);
800 	return err;
801 }
802 
bpf_ctx_init(const union bpf_attr * kattr,u32 max_size)803 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
804 {
805 	void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
806 	void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
807 	u32 size = kattr->test.ctx_size_in;
808 	void *data;
809 	int err;
810 
811 	if (!data_in && !data_out)
812 		return NULL;
813 
814 	data = kzalloc(max_size, GFP_USER);
815 	if (!data)
816 		return ERR_PTR(-ENOMEM);
817 
818 	if (data_in) {
819 		err = bpf_check_uarg_tail_zero(USER_BPFPTR(data_in), max_size, size);
820 		if (err) {
821 			kfree(data);
822 			return ERR_PTR(err);
823 		}
824 
825 		size = min_t(u32, max_size, size);
826 		if (copy_from_user(data, data_in, size)) {
827 			kfree(data);
828 			return ERR_PTR(-EFAULT);
829 		}
830 	}
831 	return data;
832 }
833 
bpf_ctx_finish(const union bpf_attr * kattr,union bpf_attr __user * uattr,const void * data,u32 size)834 static int bpf_ctx_finish(const union bpf_attr *kattr,
835 			  union bpf_attr __user *uattr, const void *data,
836 			  u32 size)
837 {
838 	void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
839 	int err = -EFAULT;
840 	u32 copy_size = size;
841 
842 	if (!data || !data_out)
843 		return 0;
844 
845 	if (copy_size > kattr->test.ctx_size_out) {
846 		copy_size = kattr->test.ctx_size_out;
847 		err = -ENOSPC;
848 	}
849 
850 	if (copy_to_user(data_out, data, copy_size))
851 		goto out;
852 	if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
853 		goto out;
854 	if (err != -ENOSPC)
855 		err = 0;
856 out:
857 	return err;
858 }
859 
860 /**
861  * range_is_zero - test whether buffer is initialized
862  * @buf: buffer to check
863  * @from: check from this position
864  * @to: check up until (excluding) this position
865  *
866  * This function returns true if the there is a non-zero byte
867  * in the buf in the range [from,to).
868  */
range_is_zero(void * buf,size_t from,size_t to)869 static inline bool range_is_zero(void *buf, size_t from, size_t to)
870 {
871 	return !memchr_inv((u8 *)buf + from, 0, to - from);
872 }
873 
convert___skb_to_skb(struct sk_buff * skb,struct __sk_buff * __skb)874 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
875 {
876 	struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
877 
878 	if (!__skb)
879 		return 0;
880 
881 	/* make sure the fields we don't use are zeroed */
882 	if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
883 		return -EINVAL;
884 
885 	/* mark is allowed */
886 
887 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
888 			   offsetof(struct __sk_buff, priority)))
889 		return -EINVAL;
890 
891 	/* priority is allowed */
892 	/* ingress_ifindex is allowed */
893 	/* ifindex is allowed */
894 
895 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
896 			   offsetof(struct __sk_buff, cb)))
897 		return -EINVAL;
898 
899 	/* cb is allowed */
900 
901 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
902 			   offsetof(struct __sk_buff, tstamp)))
903 		return -EINVAL;
904 
905 	/* tstamp is allowed */
906 	/* wire_len is allowed */
907 	/* gso_segs is allowed */
908 
909 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
910 			   offsetof(struct __sk_buff, gso_size)))
911 		return -EINVAL;
912 
913 	/* gso_size is allowed */
914 
915 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
916 			   offsetof(struct __sk_buff, hwtstamp)))
917 		return -EINVAL;
918 
919 	/* hwtstamp is allowed */
920 
921 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, hwtstamp),
922 			   sizeof(struct __sk_buff)))
923 		return -EINVAL;
924 
925 	skb->mark = __skb->mark;
926 	skb->priority = __skb->priority;
927 	skb->skb_iif = __skb->ingress_ifindex;
928 	skb->tstamp = __skb->tstamp;
929 	memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);
930 
931 	if (__skb->wire_len == 0) {
932 		cb->pkt_len = skb->len;
933 	} else {
934 		if (__skb->wire_len < skb->len ||
935 		    __skb->wire_len > GSO_LEGACY_MAX_SIZE)
936 			return -EINVAL;
937 		cb->pkt_len = __skb->wire_len;
938 	}
939 
940 	if (__skb->gso_segs > GSO_MAX_SEGS)
941 		return -EINVAL;
942 	skb_shinfo(skb)->gso_segs = __skb->gso_segs;
943 	skb_shinfo(skb)->gso_size = __skb->gso_size;
944 	skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp;
945 
946 	return 0;
947 }
948 
convert_skb_to___skb(struct sk_buff * skb,struct __sk_buff * __skb)949 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
950 {
951 	struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;
952 
953 	if (!__skb)
954 		return;
955 
956 	__skb->mark = skb->mark;
957 	__skb->priority = skb->priority;
958 	__skb->ingress_ifindex = skb->skb_iif;
959 	__skb->ifindex = skb->dev->ifindex;
960 	__skb->tstamp = skb->tstamp;
961 	memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
962 	__skb->wire_len = cb->pkt_len;
963 	__skb->gso_segs = skb_shinfo(skb)->gso_segs;
964 	__skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp;
965 }
966 
967 static struct proto bpf_dummy_proto = {
968 	.name   = "bpf_dummy",
969 	.owner  = THIS_MODULE,
970 	.obj_size = sizeof(struct sock),
971 };
972 
bpf_prog_test_run_skb(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)973 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
974 			  union bpf_attr __user *uattr)
975 {
976 	bool is_l2 = false, is_direct_pkt_access = false;
977 	struct net *net = current->nsproxy->net_ns;
978 	struct net_device *dev = net->loopback_dev;
979 	u32 size = kattr->test.data_size_in;
980 	u32 repeat = kattr->test.repeat;
981 	struct __sk_buff *ctx = NULL;
982 	u32 retval, duration;
983 	int hh_len = ETH_HLEN;
984 	struct sk_buff *skb;
985 	struct sock *sk;
986 	void *data;
987 	int ret;
988 
989 	if ((kattr->test.flags & ~BPF_F_TEST_SKB_CHECKSUM_COMPLETE) ||
990 	    kattr->test.cpu || kattr->test.batch_size)
991 		return -EINVAL;
992 
993 	if (size < ETH_HLEN)
994 		return -EINVAL;
995 
996 	data = bpf_test_init(kattr, kattr->test.data_size_in,
997 			     size, NET_SKB_PAD + NET_IP_ALIGN,
998 			     SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
999 	if (IS_ERR(data))
1000 		return PTR_ERR(data);
1001 
1002 	ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
1003 	if (IS_ERR(ctx)) {
1004 		kfree(data);
1005 		return PTR_ERR(ctx);
1006 	}
1007 
1008 	switch (prog->type) {
1009 	case BPF_PROG_TYPE_SCHED_CLS:
1010 	case BPF_PROG_TYPE_SCHED_ACT:
1011 		is_l2 = true;
1012 		fallthrough;
1013 	case BPF_PROG_TYPE_LWT_IN:
1014 	case BPF_PROG_TYPE_LWT_OUT:
1015 	case BPF_PROG_TYPE_LWT_XMIT:
1016 	case BPF_PROG_TYPE_CGROUP_SKB:
1017 		is_direct_pkt_access = true;
1018 		break;
1019 	default:
1020 		break;
1021 	}
1022 
1023 	sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
1024 	if (!sk) {
1025 		kfree(data);
1026 		kfree(ctx);
1027 		return -ENOMEM;
1028 	}
1029 	sock_init_data(NULL, sk);
1030 
1031 	skb = slab_build_skb(data);
1032 	if (!skb) {
1033 		kfree(data);
1034 		kfree(ctx);
1035 		sk_free(sk);
1036 		return -ENOMEM;
1037 	}
1038 	skb->sk = sk;
1039 
1040 	skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
1041 	__skb_put(skb, size);
1042 
1043 	if (ctx && ctx->ifindex > 1) {
1044 		dev = dev_get_by_index(net, ctx->ifindex);
1045 		if (!dev) {
1046 			ret = -ENODEV;
1047 			goto out;
1048 		}
1049 	}
1050 	skb->protocol = eth_type_trans(skb, dev);
1051 	skb_reset_network_header(skb);
1052 
1053 	switch (skb->protocol) {
1054 	case htons(ETH_P_IP):
1055 		sk->sk_family = AF_INET;
1056 		if (sizeof(struct iphdr) <= skb_headlen(skb)) {
1057 			sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
1058 			sk->sk_daddr = ip_hdr(skb)->daddr;
1059 		}
1060 		break;
1061 #if IS_ENABLED(CONFIG_IPV6)
1062 	case htons(ETH_P_IPV6):
1063 		sk->sk_family = AF_INET6;
1064 		if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
1065 			sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
1066 			sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
1067 		}
1068 		break;
1069 #endif
1070 	default:
1071 		break;
1072 	}
1073 
1074 	if (is_l2)
1075 		__skb_push(skb, hh_len);
1076 	if (is_direct_pkt_access)
1077 		bpf_compute_data_pointers(skb);
1078 
1079 	ret = convert___skb_to_skb(skb, ctx);
1080 	if (ret)
1081 		goto out;
1082 
1083 	if (kattr->test.flags & BPF_F_TEST_SKB_CHECKSUM_COMPLETE) {
1084 		const int off = skb_network_offset(skb);
1085 		int len = skb->len - off;
1086 
1087 		skb->csum = skb_checksum(skb, off, len, 0);
1088 		skb->ip_summed = CHECKSUM_COMPLETE;
1089 	}
1090 
1091 	ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
1092 	if (ret)
1093 		goto out;
1094 	if (!is_l2) {
1095 		if (skb_headroom(skb) < hh_len) {
1096 			int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));
1097 
1098 			if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
1099 				ret = -ENOMEM;
1100 				goto out;
1101 			}
1102 		}
1103 		memset(__skb_push(skb, hh_len), 0, hh_len);
1104 	}
1105 
1106 	if (kattr->test.flags & BPF_F_TEST_SKB_CHECKSUM_COMPLETE) {
1107 		const int off = skb_network_offset(skb);
1108 		int len = skb->len - off;
1109 		__wsum csum;
1110 
1111 		csum = skb_checksum(skb, off, len, 0);
1112 
1113 		if (csum_fold(skb->csum) != csum_fold(csum)) {
1114 			ret = -EBADMSG;
1115 			goto out;
1116 		}
1117 	}
1118 
1119 	convert_skb_to___skb(skb, ctx);
1120 
1121 	size = skb->len;
1122 	/* bpf program can never convert linear skb to non-linear */
1123 	if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
1124 		size = skb_headlen(skb);
1125 	ret = bpf_test_finish(kattr, uattr, skb->data, NULL, size, retval,
1126 			      duration);
1127 	if (!ret)
1128 		ret = bpf_ctx_finish(kattr, uattr, ctx,
1129 				     sizeof(struct __sk_buff));
1130 out:
1131 	if (dev && dev != net->loopback_dev)
1132 		dev_put(dev);
1133 	kfree_skb(skb);
1134 	sk_free(sk);
1135 	kfree(ctx);
1136 	return ret;
1137 }
1138 
xdp_convert_md_to_buff(struct xdp_md * xdp_md,struct xdp_buff * xdp)1139 static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp)
1140 {
1141 	unsigned int ingress_ifindex, rx_queue_index;
1142 	struct netdev_rx_queue *rxqueue;
1143 	struct net_device *device;
1144 
1145 	if (!xdp_md)
1146 		return 0;
1147 
1148 	if (xdp_md->egress_ifindex != 0)
1149 		return -EINVAL;
1150 
1151 	ingress_ifindex = xdp_md->ingress_ifindex;
1152 	rx_queue_index = xdp_md->rx_queue_index;
1153 
1154 	if (!ingress_ifindex && rx_queue_index)
1155 		return -EINVAL;
1156 
1157 	if (ingress_ifindex) {
1158 		device = dev_get_by_index(current->nsproxy->net_ns,
1159 					  ingress_ifindex);
1160 		if (!device)
1161 			return -ENODEV;
1162 
1163 		if (rx_queue_index >= device->real_num_rx_queues)
1164 			goto free_dev;
1165 
1166 		rxqueue = __netif_get_rx_queue(device, rx_queue_index);
1167 
1168 		if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq))
1169 			goto free_dev;
1170 
1171 		xdp->rxq = &rxqueue->xdp_rxq;
1172 		/* The device is now tracked in the xdp->rxq for later
1173 		 * dev_put()
1174 		 */
1175 	}
1176 
1177 	xdp->data = xdp->data_meta + xdp_md->data;
1178 	return 0;
1179 
1180 free_dev:
1181 	dev_put(device);
1182 	return -EINVAL;
1183 }
1184 
xdp_convert_buff_to_md(struct xdp_buff * xdp,struct xdp_md * xdp_md)1185 static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md)
1186 {
1187 	if (!xdp_md)
1188 		return;
1189 
1190 	xdp_md->data = xdp->data - xdp->data_meta;
1191 	xdp_md->data_end = xdp->data_end - xdp->data_meta;
1192 
1193 	if (xdp_md->ingress_ifindex)
1194 		dev_put(xdp->rxq->dev);
1195 }
1196 
bpf_prog_test_run_xdp(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1197 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
1198 			  union bpf_attr __user *uattr)
1199 {
1200 	bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES);
1201 	u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
1202 	u32 retval = 0, meta_sz = 0, duration, max_linear_sz, size;
1203 	u32 linear_sz = kattr->test.data_size_in;
1204 	u32 batch_size = kattr->test.batch_size;
1205 	u32 headroom = XDP_PACKET_HEADROOM;
1206 	u32 repeat = kattr->test.repeat;
1207 	struct netdev_rx_queue *rxqueue;
1208 	struct skb_shared_info *sinfo;
1209 	struct xdp_buff xdp = {};
1210 	int i, ret = -EINVAL;
1211 	struct xdp_md *ctx;
1212 	void *data;
1213 
1214 	if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
1215 	    prog->expected_attach_type == BPF_XDP_CPUMAP)
1216 		return -EINVAL;
1217 
1218 	if (kattr->test.flags & ~BPF_F_TEST_XDP_LIVE_FRAMES)
1219 		return -EINVAL;
1220 
1221 	if (bpf_prog_is_dev_bound(prog->aux))
1222 		return -EINVAL;
1223 
1224 	if (do_live) {
1225 		if (!batch_size)
1226 			batch_size = NAPI_POLL_WEIGHT;
1227 		else if (batch_size > TEST_XDP_MAX_BATCH)
1228 			return -E2BIG;
1229 
1230 		headroom += sizeof(struct xdp_page_head);
1231 	} else if (batch_size) {
1232 		return -EINVAL;
1233 	}
1234 
1235 	ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md));
1236 	if (IS_ERR(ctx))
1237 		return PTR_ERR(ctx);
1238 
1239 	if (ctx) {
1240 		/* There can't be user provided data before the meta data */
1241 		if (ctx->data_meta || ctx->data_end > kattr->test.data_size_in ||
1242 		    ctx->data > ctx->data_end ||
1243 		    unlikely(xdp_metalen_invalid(ctx->data)) ||
1244 		    (do_live && (kattr->test.data_out || kattr->test.ctx_out)))
1245 			goto free_ctx;
1246 		/* Meta data is allocated from the headroom */
1247 		headroom -= ctx->data;
1248 
1249 		meta_sz = ctx->data;
1250 		linear_sz = ctx->data_end;
1251 	}
1252 
1253 	max_linear_sz = PAGE_SIZE - headroom - tailroom;
1254 	linear_sz = min_t(u32, linear_sz, max_linear_sz);
1255 
1256 	/* disallow live data mode for jumbo frames */
1257 	if (do_live && kattr->test.data_size_in > linear_sz)
1258 		goto free_ctx;
1259 
1260 	if (kattr->test.data_size_in - meta_sz < ETH_HLEN)
1261 		goto free_ctx;
1262 
1263 	data = bpf_test_init(kattr, linear_sz, max_linear_sz, headroom, tailroom);
1264 	if (IS_ERR(data)) {
1265 		ret = PTR_ERR(data);
1266 		goto free_ctx;
1267 	}
1268 
1269 	rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
1270 	rxqueue->xdp_rxq.frag_size = PAGE_SIZE;
1271 	xdp_init_buff(&xdp, rxqueue->xdp_rxq.frag_size, &rxqueue->xdp_rxq);
1272 	xdp_prepare_buff(&xdp, data, headroom, linear_sz, true);
1273 	sinfo = xdp_get_shared_info_from_buff(&xdp);
1274 
1275 	ret = xdp_convert_md_to_buff(ctx, &xdp);
1276 	if (ret)
1277 		goto free_data;
1278 
1279 	size = linear_sz;
1280 	if (unlikely(kattr->test.data_size_in > size)) {
1281 		void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
1282 
1283 		while (size < kattr->test.data_size_in) {
1284 			struct page *page;
1285 			skb_frag_t *frag;
1286 			u32 data_len;
1287 
1288 			if (sinfo->nr_frags == MAX_SKB_FRAGS) {
1289 				ret = -ENOMEM;
1290 				goto out;
1291 			}
1292 
1293 			page = alloc_page(GFP_KERNEL);
1294 			if (!page) {
1295 				ret = -ENOMEM;
1296 				goto out;
1297 			}
1298 
1299 			frag = &sinfo->frags[sinfo->nr_frags++];
1300 
1301 			data_len = min_t(u32, kattr->test.data_size_in - size,
1302 					 PAGE_SIZE);
1303 			skb_frag_fill_page_desc(frag, page, 0, data_len);
1304 
1305 			if (copy_from_user(page_address(page), data_in + size,
1306 					   data_len)) {
1307 				ret = -EFAULT;
1308 				goto out;
1309 			}
1310 			sinfo->xdp_frags_size += data_len;
1311 			size += data_len;
1312 		}
1313 		xdp_buff_set_frags_flag(&xdp);
1314 	}
1315 
1316 	if (repeat > 1)
1317 		bpf_prog_change_xdp(NULL, prog);
1318 
1319 	if (do_live)
1320 		ret = bpf_test_run_xdp_live(prog, &xdp, repeat, batch_size, &duration);
1321 	else
1322 		ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
1323 	/* We convert the xdp_buff back to an xdp_md before checking the return
1324 	 * code so the reference count of any held netdevice will be decremented
1325 	 * even if the test run failed.
1326 	 */
1327 	xdp_convert_buff_to_md(&xdp, ctx);
1328 	if (ret)
1329 		goto out;
1330 
1331 	size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size;
1332 	ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size,
1333 			      retval, duration);
1334 	if (!ret)
1335 		ret = bpf_ctx_finish(kattr, uattr, ctx,
1336 				     sizeof(struct xdp_md));
1337 
1338 out:
1339 	if (repeat > 1)
1340 		bpf_prog_change_xdp(prog, NULL);
1341 free_data:
1342 	for (i = 0; i < sinfo->nr_frags; i++)
1343 		__free_page(skb_frag_page(&sinfo->frags[i]));
1344 	kfree(data);
1345 free_ctx:
1346 	kfree(ctx);
1347 	return ret;
1348 }
1349 
verify_user_bpf_flow_keys(struct bpf_flow_keys * ctx)1350 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
1351 {
1352 	/* make sure the fields we don't use are zeroed */
1353 	if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
1354 		return -EINVAL;
1355 
1356 	/* flags is allowed */
1357 
1358 	if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
1359 			   sizeof(struct bpf_flow_keys)))
1360 		return -EINVAL;
1361 
1362 	return 0;
1363 }
1364 
bpf_prog_test_run_flow_dissector(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1365 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
1366 				     const union bpf_attr *kattr,
1367 				     union bpf_attr __user *uattr)
1368 {
1369 	struct bpf_test_timer t = {};
1370 	u32 size = kattr->test.data_size_in;
1371 	struct bpf_flow_dissector ctx = {};
1372 	u32 repeat = kattr->test.repeat;
1373 	struct bpf_flow_keys *user_ctx;
1374 	struct bpf_flow_keys flow_keys;
1375 	const struct ethhdr *eth;
1376 	unsigned int flags = 0;
1377 	u32 retval, duration;
1378 	void *data;
1379 	int ret;
1380 
1381 	if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1382 		return -EINVAL;
1383 
1384 	if (size < ETH_HLEN)
1385 		return -EINVAL;
1386 
1387 	data = bpf_test_init(kattr, kattr->test.data_size_in, size, 0, 0);
1388 	if (IS_ERR(data))
1389 		return PTR_ERR(data);
1390 
1391 	eth = (struct ethhdr *)data;
1392 
1393 	if (!repeat)
1394 		repeat = 1;
1395 
1396 	user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
1397 	if (IS_ERR(user_ctx)) {
1398 		kfree(data);
1399 		return PTR_ERR(user_ctx);
1400 	}
1401 	if (user_ctx) {
1402 		ret = verify_user_bpf_flow_keys(user_ctx);
1403 		if (ret)
1404 			goto out;
1405 		flags = user_ctx->flags;
1406 	}
1407 
1408 	ctx.flow_keys = &flow_keys;
1409 	ctx.data = data;
1410 	ctx.data_end = (__u8 *)data + size;
1411 
1412 	bpf_test_timer_enter(&t);
1413 	do {
1414 		retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
1415 					  size, flags);
1416 	} while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
1417 	bpf_test_timer_leave(&t);
1418 
1419 	if (ret < 0)
1420 		goto out;
1421 
1422 	ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL,
1423 			      sizeof(flow_keys), retval, duration);
1424 	if (!ret)
1425 		ret = bpf_ctx_finish(kattr, uattr, user_ctx,
1426 				     sizeof(struct bpf_flow_keys));
1427 
1428 out:
1429 	kfree(user_ctx);
1430 	kfree(data);
1431 	return ret;
1432 }
1433 
bpf_prog_test_run_sk_lookup(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1434 int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr,
1435 				union bpf_attr __user *uattr)
1436 {
1437 	struct bpf_test_timer t = {};
1438 	struct bpf_prog_array *progs = NULL;
1439 	struct bpf_sk_lookup_kern ctx = {};
1440 	u32 repeat = kattr->test.repeat;
1441 	struct bpf_sk_lookup *user_ctx;
1442 	u32 retval, duration;
1443 	int ret = -EINVAL;
1444 
1445 	if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1446 		return -EINVAL;
1447 
1448 	if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out ||
1449 	    kattr->test.data_size_out)
1450 		return -EINVAL;
1451 
1452 	if (!repeat)
1453 		repeat = 1;
1454 
1455 	user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx));
1456 	if (IS_ERR(user_ctx))
1457 		return PTR_ERR(user_ctx);
1458 
1459 	if (!user_ctx)
1460 		return -EINVAL;
1461 
1462 	if (user_ctx->sk)
1463 		goto out;
1464 
1465 	if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx)))
1466 		goto out;
1467 
1468 	if (user_ctx->local_port > U16_MAX) {
1469 		ret = -ERANGE;
1470 		goto out;
1471 	}
1472 
1473 	ctx.family = (u16)user_ctx->family;
1474 	ctx.protocol = (u16)user_ctx->protocol;
1475 	ctx.dport = (u16)user_ctx->local_port;
1476 	ctx.sport = user_ctx->remote_port;
1477 
1478 	switch (ctx.family) {
1479 	case AF_INET:
1480 		ctx.v4.daddr = (__force __be32)user_ctx->local_ip4;
1481 		ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4;
1482 		break;
1483 
1484 #if IS_ENABLED(CONFIG_IPV6)
1485 	case AF_INET6:
1486 		ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6;
1487 		ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6;
1488 		break;
1489 #endif
1490 
1491 	default:
1492 		ret = -EAFNOSUPPORT;
1493 		goto out;
1494 	}
1495 
1496 	progs = bpf_prog_array_alloc(1, GFP_KERNEL);
1497 	if (!progs) {
1498 		ret = -ENOMEM;
1499 		goto out;
1500 	}
1501 
1502 	progs->items[0].prog = prog;
1503 
1504 	bpf_test_timer_enter(&t);
1505 	do {
1506 		ctx.selected_sk = NULL;
1507 		retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run);
1508 	} while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
1509 	bpf_test_timer_leave(&t);
1510 
1511 	if (ret < 0)
1512 		goto out;
1513 
1514 	user_ctx->cookie = 0;
1515 	if (ctx.selected_sk) {
1516 		if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) {
1517 			ret = -EOPNOTSUPP;
1518 			goto out;
1519 		}
1520 
1521 		user_ctx->cookie = sock_gen_cookie(ctx.selected_sk);
1522 	}
1523 
1524 	ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
1525 	if (!ret)
1526 		ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx));
1527 
1528 out:
1529 	bpf_prog_array_free(progs);
1530 	kfree(user_ctx);
1531 	return ret;
1532 }
1533 
bpf_prog_test_run_syscall(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1534 int bpf_prog_test_run_syscall(struct bpf_prog *prog,
1535 			      const union bpf_attr *kattr,
1536 			      union bpf_attr __user *uattr)
1537 {
1538 	void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
1539 	__u32 ctx_size_in = kattr->test.ctx_size_in;
1540 	void *ctx = NULL;
1541 	u32 retval;
1542 	int err = 0;
1543 
1544 	/* doesn't support data_in/out, ctx_out, duration, or repeat or flags */
1545 	if (kattr->test.data_in || kattr->test.data_out ||
1546 	    kattr->test.ctx_out || kattr->test.duration ||
1547 	    kattr->test.repeat || kattr->test.flags ||
1548 	    kattr->test.batch_size)
1549 		return -EINVAL;
1550 
1551 	if (ctx_size_in < prog->aux->max_ctx_offset ||
1552 	    ctx_size_in > U16_MAX)
1553 		return -EINVAL;
1554 
1555 	if (ctx_size_in) {
1556 		ctx = memdup_user(ctx_in, ctx_size_in);
1557 		if (IS_ERR(ctx))
1558 			return PTR_ERR(ctx);
1559 	}
1560 
1561 	rcu_read_lock_trace();
1562 	retval = bpf_prog_run_pin_on_cpu(prog, ctx);
1563 	rcu_read_unlock_trace();
1564 
1565 	if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) {
1566 		err = -EFAULT;
1567 		goto out;
1568 	}
1569 	if (ctx_size_in)
1570 		if (copy_to_user(ctx_in, ctx, ctx_size_in))
1571 			err = -EFAULT;
1572 out:
1573 	kfree(ctx);
1574 	return err;
1575 }
1576 
verify_and_copy_hook_state(struct nf_hook_state * state,const struct nf_hook_state * user,struct net_device * dev)1577 static int verify_and_copy_hook_state(struct nf_hook_state *state,
1578 				      const struct nf_hook_state *user,
1579 				      struct net_device *dev)
1580 {
1581 	if (user->in || user->out)
1582 		return -EINVAL;
1583 
1584 	if (user->net || user->sk || user->okfn)
1585 		return -EINVAL;
1586 
1587 	switch (user->pf) {
1588 	case NFPROTO_IPV4:
1589 	case NFPROTO_IPV6:
1590 		switch (state->hook) {
1591 		case NF_INET_PRE_ROUTING:
1592 			state->in = dev;
1593 			break;
1594 		case NF_INET_LOCAL_IN:
1595 			state->in = dev;
1596 			break;
1597 		case NF_INET_FORWARD:
1598 			state->in = dev;
1599 			state->out = dev;
1600 			break;
1601 		case NF_INET_LOCAL_OUT:
1602 			state->out = dev;
1603 			break;
1604 		case NF_INET_POST_ROUTING:
1605 			state->out = dev;
1606 			break;
1607 		}
1608 
1609 		break;
1610 	default:
1611 		return -EINVAL;
1612 	}
1613 
1614 	state->pf = user->pf;
1615 	state->hook = user->hook;
1616 
1617 	return 0;
1618 }
1619 
nfproto_eth(int nfproto)1620 static __be16 nfproto_eth(int nfproto)
1621 {
1622 	switch (nfproto) {
1623 	case NFPROTO_IPV4:
1624 		return htons(ETH_P_IP);
1625 	case NFPROTO_IPV6:
1626 		break;
1627 	}
1628 
1629 	return htons(ETH_P_IPV6);
1630 }
1631 
bpf_prog_test_run_nf(struct bpf_prog * prog,const union bpf_attr * kattr,union bpf_attr __user * uattr)1632 int bpf_prog_test_run_nf(struct bpf_prog *prog,
1633 			 const union bpf_attr *kattr,
1634 			 union bpf_attr __user *uattr)
1635 {
1636 	struct net *net = current->nsproxy->net_ns;
1637 	struct net_device *dev = net->loopback_dev;
1638 	struct nf_hook_state *user_ctx, hook_state = {
1639 		.pf = NFPROTO_IPV4,
1640 		.hook = NF_INET_LOCAL_OUT,
1641 	};
1642 	u32 size = kattr->test.data_size_in;
1643 	u32 repeat = kattr->test.repeat;
1644 	struct bpf_nf_ctx ctx = {
1645 		.state = &hook_state,
1646 	};
1647 	struct sk_buff *skb = NULL;
1648 	u32 retval, duration;
1649 	void *data;
1650 	int ret;
1651 
1652 	if (kattr->test.flags || kattr->test.cpu || kattr->test.batch_size)
1653 		return -EINVAL;
1654 
1655 	if (size < sizeof(struct iphdr))
1656 		return -EINVAL;
1657 
1658 	data = bpf_test_init(kattr, kattr->test.data_size_in, size,
1659 			     NET_SKB_PAD + NET_IP_ALIGN,
1660 			     SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
1661 	if (IS_ERR(data))
1662 		return PTR_ERR(data);
1663 
1664 	if (!repeat)
1665 		repeat = 1;
1666 
1667 	user_ctx = bpf_ctx_init(kattr, sizeof(struct nf_hook_state));
1668 	if (IS_ERR(user_ctx)) {
1669 		kfree(data);
1670 		return PTR_ERR(user_ctx);
1671 	}
1672 
1673 	if (user_ctx) {
1674 		ret = verify_and_copy_hook_state(&hook_state, user_ctx, dev);
1675 		if (ret)
1676 			goto out;
1677 	}
1678 
1679 	skb = slab_build_skb(data);
1680 	if (!skb) {
1681 		ret = -ENOMEM;
1682 		goto out;
1683 	}
1684 
1685 	data = NULL; /* data released via kfree_skb */
1686 
1687 	skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
1688 	__skb_put(skb, size);
1689 
1690 	ret = -EINVAL;
1691 
1692 	if (hook_state.hook != NF_INET_LOCAL_OUT) {
1693 		if (size < ETH_HLEN + sizeof(struct iphdr))
1694 			goto out;
1695 
1696 		skb->protocol = eth_type_trans(skb, dev);
1697 		switch (skb->protocol) {
1698 		case htons(ETH_P_IP):
1699 			if (hook_state.pf == NFPROTO_IPV4)
1700 				break;
1701 			goto out;
1702 		case htons(ETH_P_IPV6):
1703 			if (size < ETH_HLEN + sizeof(struct ipv6hdr))
1704 				goto out;
1705 			if (hook_state.pf == NFPROTO_IPV6)
1706 				break;
1707 			goto out;
1708 		default:
1709 			ret = -EPROTO;
1710 			goto out;
1711 		}
1712 
1713 		skb_reset_network_header(skb);
1714 	} else {
1715 		skb->protocol = nfproto_eth(hook_state.pf);
1716 	}
1717 
1718 	ctx.skb = skb;
1719 
1720 	ret = bpf_test_run(prog, &ctx, repeat, &retval, &duration, false);
1721 	if (ret)
1722 		goto out;
1723 
1724 	ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, retval, duration);
1725 
1726 out:
1727 	kfree(user_ctx);
1728 	kfree_skb(skb);
1729 	kfree(data);
1730 	return ret;
1731 }
1732 
1733 static const struct btf_kfunc_id_set bpf_prog_test_kfunc_set = {
1734 	.owner = THIS_MODULE,
1735 	.set   = &test_sk_check_kfunc_ids,
1736 };
1737 
1738 BTF_ID_LIST(bpf_prog_test_dtor_kfunc_ids)
BTF_ID(struct,prog_test_ref_kfunc)1739 BTF_ID(struct, prog_test_ref_kfunc)
1740 BTF_ID(func, bpf_kfunc_call_test_release_dtor)
1741 BTF_ID(struct, prog_test_member)
1742 BTF_ID(func, bpf_kfunc_call_memb_release_dtor)
1743 
1744 static int __init bpf_prog_test_run_init(void)
1745 {
1746 	const struct btf_id_dtor_kfunc bpf_prog_test_dtor_kfunc[] = {
1747 		{
1748 		  .btf_id       = bpf_prog_test_dtor_kfunc_ids[0],
1749 		  .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[1]
1750 		},
1751 		{
1752 		  .btf_id	= bpf_prog_test_dtor_kfunc_ids[2],
1753 		  .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[3],
1754 		},
1755 	};
1756 	int ret;
1757 
1758 	ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set);
1759 	ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
1760 	ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set);
1761 	ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set);
1762 	return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,
1763 						  ARRAY_SIZE(bpf_prog_test_dtor_kfunc),
1764 						  THIS_MODULE);
1765 }
1766 late_initcall(bpf_prog_test_run_init);
1767