net/bpf/test_run.c - third_party/kernel - Git at Google

 // SPDX-License-Identifier: GPL-2.0-only
 /* Copyright (c) 2017 Facebook
  */
 #include <linux/bpf.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
 #include <linux/etherdevice.h>
 #include <linux/filter.h>
 #include <linux/sched/signal.h>
 #include <net/bpf_sk_storage.h>
 #include <net/sock.h>
 #include <net/tcp.h>
 #include <linux/error-injection.h>
 #include <linux/smp.h>

 #define CREATE_TRACE_POINTS
 #include <trace/events/bpf_test_run.h>

 static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
 			u32 *retval, u32 *time, bool xdp)
 {
 	struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { NULL };
 	enum bpf_cgroup_storage_type stype;
 	u64 time_start, time_spent = 0;
 	int ret = 0;
 	u32 i;

 	for_each_cgroup_storage_type(stype) {
 		storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
 		if (IS_ERR(storage[stype])) {
 			storage[stype] = NULL;
 			for_each_cgroup_storage_type(stype)
 				bpf_cgroup_storage_free(storage[stype]);
 			return -ENOMEM;
 		}
 	}

 	if (!repeat)
 		repeat = 1;

 	rcu_read_lock();
 	migrate_disable();
 	time_start = ktime_get_ns();
 	for (i = 0; i < repeat; i++) {
 		ret = bpf_cgroup_storage_set(storage);
 		if (ret)
 			break;

 		if (xdp)
 			*retval = bpf_prog_run_xdp(prog, ctx);
 		else
 			*retval = BPF_PROG_RUN(prog, ctx);

 		bpf_cgroup_storage_unset();

 		if (signal_pending(current)) {
 			ret = -EINTR;
 			break;
 		}

 		if (need_resched()) {
 			time_spent += ktime_get_ns() - time_start;
 			migrate_enable();
 			rcu_read_unlock();

 			cond_resched();

 			rcu_read_lock();
 			migrate_disable();
 			time_start = ktime_get_ns();
 		}
 	}
 	time_spent += ktime_get_ns() - time_start;
 	migrate_enable();
 	rcu_read_unlock();

 	do_div(time_spent, repeat);
 	*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;

 	for_each_cgroup_storage_type(stype)
 		bpf_cgroup_storage_free(storage[stype]);

 	return ret;
 }

 static int bpf_test_finish(const union bpf_attr *kattr,
 			   union bpf_attr __user *uattr, const void *data,
 			   u32 size, u32 retval, u32 duration)
 {
 	void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
 	int err = -EFAULT;
 	u32 copy_size = size;

 	/* Clamp copy if the user has provided a size hint, but copy the full
 	 * buffer if not to retain old behaviour.
 	 */
 	if (kattr->test.data_size_out &&
 	    copy_size > kattr->test.data_size_out) {
 		copy_size = kattr->test.data_size_out;
 		err = -ENOSPC;
 	}

 	if (data_out && copy_to_user(data_out, data, copy_size))
 		goto out;
 	if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
 		goto out;
 	if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
 		goto out;
 	if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
 		goto out;
 	if (err != -ENOSPC)
 		err = 0;
 out:
 	trace_bpf_test_finish(&err);
 	return err;
 }

 /* Integer types of various sizes and pointer combinations cover variety of
  * architecture dependent calling conventions. 7+ can be supported in the
  * future.
  */
 __diag_push();
 __diag_ignore(GCC, 8, "-Wmissing-prototypes",
 	      "Global functions as their definitions will be in vmlinux BTF");
 int noinline bpf_fentry_test1(int a)
 {
 	return a + 1;
 }

 int noinline bpf_fentry_test2(int a, u64 b)
 {
 	return a + b;
 }

 int noinline bpf_fentry_test3(char a, int b, u64 c)
 {
 	return a + b + c;
 }

 int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
 {
 	return (long)a + b + c + d;
 }

 int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
 {
 	return a + (long)b + c + d + e;
 }

 int noinline bpf_fentry_test6(u64 a, void *b, short c, int d, void *e, u64 f)
 {
 	return a + (long)b + c + d + (long)e + f;
 }

 struct bpf_fentry_test_t {
 	struct bpf_fentry_test_t *a;
 };

 int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
 {
 	return (long)arg;
 }

 int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
 {
 	return (long)arg->a;
 }

 int noinline bpf_modify_return_test(int a, int *b)
 {
 	*b += 1;
 	return a + *b;
 }
 __diag_pop();

 ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);

 static void *bpf_test_init(const union bpf_attr *kattr, u32 size,
 			   u32 headroom, u32 tailroom)
 {
 	void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
 	u32 user_size = kattr->test.data_size_in;
 	void *data;

 	if (size < ETH_HLEN || size > PAGE_SIZE - headroom - tailroom)
 		return ERR_PTR(-EINVAL);

 	if (user_size > size)
 		return ERR_PTR(-EMSGSIZE);

 	data = kzalloc(size + headroom + tailroom, GFP_USER);
 	if (!data)
 		return ERR_PTR(-ENOMEM);

 	if (copy_from_user(data + headroom, data_in, user_size)) {
 		kfree(data);
 		return ERR_PTR(-EFAULT);
 	}

 	return data;
 }

 int bpf_prog_test_run_tracing(struct bpf_prog *prog,
 			      const union bpf_attr *kattr,
 			      union bpf_attr __user *uattr)
 {
 	struct bpf_fentry_test_t arg = {};
 	u16 side_effect = 0, ret = 0;
 	int b = 2, err = -EFAULT;
 	u32 retval = 0;

 	if (kattr->test.flags || kattr->test.cpu)
 		return -EINVAL;

 	switch (prog->expected_attach_type) {
 	case BPF_TRACE_FENTRY:
 	case BPF_TRACE_FEXIT:
 		if (bpf_fentry_test1(1) != 2 ||
 		    bpf_fentry_test2(2, 3) != 5 ||
 		    bpf_fentry_test3(4, 5, 6) != 15 ||
 		    bpf_fentry_test4((void *)7, 8, 9, 10) != 34 ||
 		    bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 ||
 		    bpf_fentry_test6(16, (void *)17, 18, 19, (void *)20, 21) != 111 ||
 		    bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 ||
 		    bpf_fentry_test8(&arg) != 0)
 			goto out;
 		break;
 	case BPF_MODIFY_RETURN:
 		ret = bpf_modify_return_test(1, &b);
 		if (b != 2)
 			side_effect = 1;
 		break;
 	default:
 		goto out;
 	}

 	retval = ((u32)side_effect << 16) | ret;
 	if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
 		goto out;

 	err = 0;
 out:
 	trace_bpf_test_finish(&err);
 	return err;
 }

 struct bpf_raw_tp_test_run_info {
 	struct bpf_prog *prog;
 	void *ctx;
 	u32 retval;
 };

 static void
 __bpf_prog_test_run_raw_tp(void *data)
 {
 	struct bpf_raw_tp_test_run_info *info = data;

 	rcu_read_lock();
 	info->retval = BPF_PROG_RUN(info->prog, info->ctx);
 	rcu_read_unlock();
 }

 int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
 			     const union bpf_attr *kattr,
 			     union bpf_attr __user *uattr)
 {
 	void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
 	__u32 ctx_size_in = kattr->test.ctx_size_in;
 	struct bpf_raw_tp_test_run_info info;
 	int cpu = kattr->test.cpu, err = 0;
 	int current_cpu;

 	/* doesn't support data_in/out, ctx_out, duration, or repeat */
 	if (kattr->test.data_in || kattr->test.data_out ||
 	    kattr->test.ctx_out || kattr->test.duration ||
 	    kattr->test.repeat)
 		return -EINVAL;

 	if (ctx_size_in < prog->aux->max_ctx_offset ||
 	    ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
 		return -EINVAL;

 	if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
 		return -EINVAL;

 	if (ctx_size_in) {
 		info.ctx = kzalloc(ctx_size_in, GFP_USER);
 		if (!info.ctx)
 			return -ENOMEM;
 		if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) {
 			err = -EFAULT;
 			goto out;
 		}
 	} else {
 		info.ctx = NULL;
 	}

 	info.prog = prog;

 	current_cpu = get_cpu();
 	if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 ||
 	    cpu == current_cpu) {
 		__bpf_prog_test_run_raw_tp(&info);
 	} else if (cpu >= nr_cpu_ids || !cpu_online(cpu)) {
 		/* smp_call_function_single() also checks cpu_online()
 		 * after csd_lock(). However, since cpu is from user
 		 * space, let's do an extra quick check to filter out
 		 * invalid value before smp_call_function_single().
 		 */
 		err = -ENXIO;
 	} else {
 		err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
 					       &info, 1);
 	}
 	put_cpu();

 	if (!err &&
 	    copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
 		err = -EFAULT;

 out:
 	kfree(info.ctx);
 	return err;
 }

 static void *bpf_ctx_init(const union bpf_attr *kattr, u32 max_size)
 {
 	void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
 	void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
 	u32 size = kattr->test.ctx_size_in;
 	void *data;
 	int err;

 	if (!data_in && !data_out)
 		return NULL;

 	data = kzalloc(max_size, GFP_USER);
 	if (!data)
 		return ERR_PTR(-ENOMEM);

 	if (data_in) {
 		err = bpf_check_uarg_tail_zero(data_in, max_size, size);
 		if (err) {
 			kfree(data);
 			return ERR_PTR(err);
 		}

 		size = min_t(u32, max_size, size);
 		if (copy_from_user(data, data_in, size)) {
 			kfree(data);
 			return ERR_PTR(-EFAULT);
 		}
 	}
 	return data;
 }

 static int bpf_ctx_finish(const union bpf_attr *kattr,
 			  union bpf_attr __user *uattr, const void *data,
 			  u32 size)
 {
 	void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
 	int err = -EFAULT;
 	u32 copy_size = size;

 	if (!data || !data_out)
 		return 0;

 	if (copy_size > kattr->test.ctx_size_out) {
 		copy_size = kattr->test.ctx_size_out;
 		err = -ENOSPC;
 	}

 	if (copy_to_user(data_out, data, copy_size))
 		goto out;
 	if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
 		goto out;
 	if (err != -ENOSPC)
 		err = 0;
 out:
 	return err;
 }

 /**
  * range_is_zero - test whether buffer is initialized
  * @buf: buffer to check
  * @from: check from this position
  * @to: check up until (excluding) this position
  *
  * This function returns true if the there is a non-zero byte
  * in the buf in the range [from,to).
  */
 static inline bool range_is_zero(void *buf, size_t from, size_t to)
 {
 	return !memchr_inv((u8 *)buf + from, 0, to - from);
 }

 static int convert___skb_to_skb(struct sk_buff *skb, struct __sk_buff *__skb)
 {
 	struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;

 	if (!__skb)
 		return 0;

 	/* make sure the fields we don't use are zeroed */
 	if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
 		return -EINVAL;

 	/* mark is allowed */

 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
 			   offsetof(struct __sk_buff, priority)))
 		return -EINVAL;

 	/* priority is allowed */

 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, priority),
 			   offsetof(struct __sk_buff, ifindex)))
 		return -EINVAL;

 	/* ifindex is allowed */

 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
 			   offsetof(struct __sk_buff, cb)))
 		return -EINVAL;

 	/* cb is allowed */

 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
 			   offsetof(struct __sk_buff, tstamp)))
 		return -EINVAL;

 	/* tstamp is allowed */
 	/* wire_len is allowed */
 	/* gso_segs is allowed */

 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
 			   offsetof(struct __sk_buff, gso_size)))
 		return -EINVAL;

 	/* gso_size is allowed */

 	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
 			   sizeof(struct __sk_buff)))
 		return -EINVAL;

 	skb->mark = __skb->mark;
 	skb->priority = __skb->priority;
 	skb->tstamp = __skb->tstamp;
 	memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);

 	if (__skb->wire_len == 0) {
 		cb->pkt_len = skb->len;
 	} else {
 		if (__skb->wire_len < skb->len ||
 		    __skb->wire_len > GSO_MAX_SIZE)
 			return -EINVAL;
 		cb->pkt_len = __skb->wire_len;
 	}

 	if (__skb->gso_segs > GSO_MAX_SEGS)
 		return -EINVAL;
 	skb_shinfo(skb)->gso_segs = __skb->gso_segs;
 	skb_shinfo(skb)->gso_size = __skb->gso_size;

 	return 0;
 }

 static void convert_skb_to___skb(struct sk_buff *skb, struct __sk_buff *__skb)
 {
 	struct qdisc_skb_cb *cb = (struct qdisc_skb_cb *)skb->cb;

 	if (!__skb)
 		return;

 	__skb->mark = skb->mark;
 	__skb->priority = skb->priority;
 	__skb->ifindex = skb->dev->ifindex;
 	__skb->tstamp = skb->tstamp;
 	memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
 	__skb->wire_len = cb->pkt_len;
 	__skb->gso_segs = skb_shinfo(skb)->gso_segs;
 }

 static struct proto bpf_dummy_proto = {
 	.name   = "bpf_dummy",
 	.owner  = THIS_MODULE,
 	.obj_size = sizeof(struct sock),
 };

 int bpf_prog_test_run_skb(struct bpf_prog *prog, const union bpf_attr *kattr,
 			  union bpf_attr __user *uattr)
 {
 	bool is_l2 = false, is_direct_pkt_access = false;
 	struct net *net = current->nsproxy->net_ns;
 	struct net_device *dev = net->loopback_dev;
 	u32 size = kattr->test.data_size_in;
 	u32 repeat = kattr->test.repeat;
 	struct __sk_buff *ctx = NULL;
 	u32 retval, duration;
 	int hh_len = ETH_HLEN;
 	struct sk_buff *skb;
 	struct sock *sk;
 	void *data;
 	int ret;

 	if (kattr->test.flags || kattr->test.cpu)
 		return -EINVAL;

 	data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
 			     SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
 	if (IS_ERR(data))
 		return PTR_ERR(data);

 	ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
 	if (IS_ERR(ctx)) {
 		kfree(data);
 		return PTR_ERR(ctx);
 	}

 	switch (prog->type) {
 	case BPF_PROG_TYPE_SCHED_CLS:
 	case BPF_PROG_TYPE_SCHED_ACT:
 		is_l2 = true;
 		fallthrough;
 	case BPF_PROG_TYPE_LWT_IN:
 	case BPF_PROG_TYPE_LWT_OUT:
 	case BPF_PROG_TYPE_LWT_XMIT:
 		is_direct_pkt_access = true;
 		break;
 	default:
 		break;
 	}

 	sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
 	if (!sk) {
 		kfree(data);
 		kfree(ctx);
 		return -ENOMEM;
 	}
 	sock_init_data(NULL, sk);

 	skb = build_skb(data, 0);
 	if (!skb) {
 		kfree(data);
 		kfree(ctx);
 		sk_free(sk);
 		return -ENOMEM;
 	}
 	skb->sk = sk;

 	skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
 	__skb_put(skb, size);
 	if (ctx && ctx->ifindex > 1) {
 		dev = dev_get_by_index(net, ctx->ifindex);
 		if (!dev) {
 			ret = -ENODEV;
 			goto out;
 		}
 	}
 	skb->protocol = eth_type_trans(skb, dev);
 	skb_reset_network_header(skb);

 	switch (skb->protocol) {
 	case htons(ETH_P_IP):
 		sk->sk_family = AF_INET;
 		if (sizeof(struct iphdr) <= skb_headlen(skb)) {
 			sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
 			sk->sk_daddr = ip_hdr(skb)->daddr;
 		}
 		break;
 #if IS_ENABLED(CONFIG_IPV6)
 	case htons(ETH_P_IPV6):
 		sk->sk_family = AF_INET6;
 		if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
 			sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
 			sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
 		}
 		break;
 #endif
 	default:
 		break;
 	}

 	if (is_l2)
 		__skb_push(skb, hh_len);
 	if (is_direct_pkt_access)
 		bpf_compute_data_pointers(skb);
 	ret = convert___skb_to_skb(skb, ctx);
 	if (ret)
 		goto out;
 	ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
 	if (ret)
 		goto out;
 	if (!is_l2) {
 		if (skb_headroom(skb) < hh_len) {
 			int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));

 			if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
 				ret = -ENOMEM;
 				goto out;
 			}
 		}
 		memset(__skb_push(skb, hh_len), 0, hh_len);
 	}
 	convert_skb_to___skb(skb, ctx);

 	size = skb->len;
 	/* bpf program can never convert linear skb to non-linear */
 	if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
 		size = skb_headlen(skb);
 	ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
 	if (!ret)
 		ret = bpf_ctx_finish(kattr, uattr, ctx,
 				     sizeof(struct __sk_buff));
 out:
 	if (dev && dev != net->loopback_dev)
 		dev_put(dev);
 	kfree_skb(skb);
 	sk_free(sk);
 	kfree(ctx);
 	return ret;
 }

 int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
 			  union bpf_attr __user *uattr)
 {
 	u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
 	u32 headroom = XDP_PACKET_HEADROOM;
 	u32 size = kattr->test.data_size_in;
 	u32 repeat = kattr->test.repeat;
 	struct netdev_rx_queue *rxqueue;
 	struct xdp_buff xdp = {};
 	u32 retval, duration;
 	u32 max_data_sz;
 	void *data;
 	int ret;

 	if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
 	    prog->expected_attach_type == BPF_XDP_CPUMAP)
 		return -EINVAL;
 	if (kattr->test.ctx_in || kattr->test.ctx_out)
 		return -EINVAL;

 	/* XDP have extra tailroom as (most) drivers use full page */
 	max_data_sz = 4096 - headroom - tailroom;

 	data = bpf_test_init(kattr, max_data_sz, headroom, tailroom);
 	if (IS_ERR(data))
 		return PTR_ERR(data);

 	xdp.data_hard_start = data;
 	xdp.data = data + headroom;
 	xdp.data_meta = xdp.data;
 	xdp.data_end = xdp.data + size;
 	xdp.frame_sz = headroom + max_data_sz + tailroom;

 	rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
 	xdp.rxq = &rxqueue->xdp_rxq;
 	bpf_prog_change_xdp(NULL, prog);
 	ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
 	if (ret)
 		goto out;
 	if (xdp.data != data + headroom || xdp.data_end != xdp.data + size)
 		size = xdp.data_end - xdp.data;
 	ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
 out:
 	bpf_prog_change_xdp(prog, NULL);
 	kfree(data);
 	return ret;
 }

 static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
 {
 	/* make sure the fields we don't use are zeroed */
 	if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
 		return -EINVAL;

 	/* flags is allowed */

 	if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
 			   sizeof(struct bpf_flow_keys)))
 		return -EINVAL;

 	return 0;
 }

 int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
 				     const union bpf_attr *kattr,
 				     union bpf_attr __user *uattr)
 {
 	u32 size = kattr->test.data_size_in;
 	struct bpf_flow_dissector ctx = {};
 	u32 repeat = kattr->test.repeat;
 	struct bpf_flow_keys *user_ctx;
 	struct bpf_flow_keys flow_keys;
 	u64 time_start, time_spent = 0;
 	const struct ethhdr *eth;
 	unsigned int flags = 0;
 	u32 retval, duration;
 	void *data;
 	int ret;
 	u32 i;

 	if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR)
 		return -EINVAL;

 	if (kattr->test.flags || kattr->test.cpu)
 		return -EINVAL;

 	if (size < ETH_HLEN)
 		return -EINVAL;

 	data = bpf_test_init(kattr, size, 0, 0);
 	if (IS_ERR(data))
 		return PTR_ERR(data);

 	eth = (struct ethhdr *)data;

 	if (!repeat)
 		repeat = 1;

 	user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
 	if (IS_ERR(user_ctx)) {
 		kfree(data);
 		return PTR_ERR(user_ctx);
 	}
 	if (user_ctx) {
 		ret = verify_user_bpf_flow_keys(user_ctx);
 		if (ret)
 			goto out;
 		flags = user_ctx->flags;
 	}

 	ctx.flow_keys = &flow_keys;
 	ctx.data = data;
 	ctx.data_end = (__u8 *)data + size;

 	rcu_read_lock();
 	preempt_disable();
 	time_start = ktime_get_ns();
 	for (i = 0; i < repeat; i++) {
 		retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
 					  size, flags);

 		if (signal_pending(current)) {
 			preempt_enable();
 			rcu_read_unlock();

 			ret = -EINTR;
 			goto out;
 		}

 		if (need_resched()) {
 			time_spent += ktime_get_ns() - time_start;
 			preempt_enable();
 			rcu_read_unlock();

 			cond_resched();

 			rcu_read_lock();
 			preempt_disable();
 			time_start = ktime_get_ns();
 		}
 	}
 	time_spent += ktime_get_ns() - time_start;
 	preempt_enable();
 	rcu_read_unlock();

 	do_div(time_spent, repeat);
 	duration = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;

 	ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
 			      retval, duration);
 	if (!ret)
 		ret = bpf_ctx_finish(kattr, uattr, user_ctx,
 				     sizeof(struct bpf_flow_keys));

 out:
 	kfree(user_ctx);
 	kfree(data);
 	return ret;
 }
	// SPDX-License-Identifier: GPL-2.0-only
	/* Copyright (c) 2017 Facebook
	*/
	#include <linux/bpf.h>
	#include <linux/slab.h>
	#include <linux/vmalloc.h>
	#include <linux/etherdevice.h>
	#include <linux/filter.h>
	#include <linux/sched/signal.h>
	#include <net/bpf_sk_storage.h>
	#include <net/sock.h>
	#include <net/tcp.h>
	#include <linux/error-injection.h>
	#include <linux/smp.h>

	#define CREATE_TRACE_POINTS
	#include <trace/events/bpf_test_run.h>

	static int bpf_test_run(struct bpf_prog prog, void ctx, u32 repeat,
	u32 retval, u32 time, bool xdp)
	{
	struct bpf_cgroup_storage *storage[MAX_BPF_CGROUP_STORAGE_TYPE] = { NULL };
	enum bpf_cgroup_storage_type stype;
	u64 time_start, time_spent = 0;
	int ret = 0;
	u32 i;

	for_each_cgroup_storage_type(stype) {
	storage[stype] = bpf_cgroup_storage_alloc(prog, stype);
	if (IS_ERR(storage[stype])) {
	storage[stype] = NULL;
	for_each_cgroup_storage_type(stype)
	bpf_cgroup_storage_free(storage[stype]);
	return -ENOMEM;
	}
	}

	if (!repeat)
	repeat = 1;

	rcu_read_lock();
	migrate_disable();
	time_start = ktime_get_ns();
	for (i = 0; i < repeat; i++) {
	ret = bpf_cgroup_storage_set(storage);
	if (ret)
	break;

	if (xdp)
	*retval = bpf_prog_run_xdp(prog, ctx);
	else
	*retval = BPF_PROG_RUN(prog, ctx);

	bpf_cgroup_storage_unset();

	if (signal_pending(current)) {
	ret = -EINTR;
	break;
	}

	if (need_resched()) {
	time_spent += ktime_get_ns() - time_start;
	migrate_enable();
	rcu_read_unlock();

	cond_resched();

	rcu_read_lock();
	migrate_disable();
	time_start = ktime_get_ns();
	}
	}
	time_spent += ktime_get_ns() - time_start;
	migrate_enable();
	rcu_read_unlock();

	do_div(time_spent, repeat);
	*time = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;

	for_each_cgroup_storage_type(stype)
	bpf_cgroup_storage_free(storage[stype]);

	return ret;
	}

	static int bpf_test_finish(const union bpf_attr *kattr,
	union bpf_attr __user uattr, const void data,
	u32 size, u32 retval, u32 duration)
	{
	void __user *data_out = u64_to_user_ptr(kattr->test.data_out);
	int err = -EFAULT;
	u32 copy_size = size;

	/* Clamp copy if the user has provided a size hint, but copy the full
	* buffer if not to retain old behaviour.
	*/
	if (kattr->test.data_size_out &&
	copy_size > kattr->test.data_size_out) {
	copy_size = kattr->test.data_size_out;
	err = -ENOSPC;
	}

	if (data_out && copy_to_user(data_out, data, copy_size))
	goto out;
	if (copy_to_user(&uattr->test.data_size_out, &size, sizeof(size)))
	goto out;
	if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
	goto out;
	if (copy_to_user(&uattr->test.duration, &duration, sizeof(duration)))
	goto out;
	if (err != -ENOSPC)
	err = 0;
	out:
	trace_bpf_test_finish(&err);
	return err;
	}

	/* Integer types of various sizes and pointer combinations cover variety of
	* architecture dependent calling conventions. 7+ can be supported in the
	* future.
	*/
	__diag_push();
	__diag_ignore(GCC, 8, "-Wmissing-prototypes",
	"Global functions as their definitions will be in vmlinux BTF");
	int noinline bpf_fentry_test1(int a)
	{
	return a + 1;
	}

	int noinline bpf_fentry_test2(int a, u64 b)
	{
	return a + b;
	}

	int noinline bpf_fentry_test3(char a, int b, u64 c)
	{
	return a + b + c;
	}

	int noinline bpf_fentry_test4(void *a, char b, int c, u64 d)
	{
	return (long)a + b + c + d;
	}

	int noinline bpf_fentry_test5(u64 a, void *b, short c, int d, u64 e)
	{
	return a + (long)b + c + d + e;
	}

	int noinline bpf_fentry_test6(u64 a, void b, short c, int d, void e, u64 f)
	{
	return a + (long)b + c + d + (long)e + f;
	}

	struct bpf_fentry_test_t {
	struct bpf_fentry_test_t *a;
	};

	int noinline bpf_fentry_test7(struct bpf_fentry_test_t *arg)
	{
	return (long)arg;
	}

	int noinline bpf_fentry_test8(struct bpf_fentry_test_t *arg)
	{
	return (long)arg->a;
	}

	int noinline bpf_modify_return_test(int a, int *b)
	{
	*b += 1;
	return a + *b;
	}
	__diag_pop();

	ALLOW_ERROR_INJECTION(bpf_modify_return_test, ERRNO);

	static void bpf_test_init(const union bpf_attr kattr, u32 size,
	u32 headroom, u32 tailroom)
	{
	void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
	u32 user_size = kattr->test.data_size_in;
	void *data;

	if (size < ETH_HLEN \|\| size > PAGE_SIZE - headroom - tailroom)
	return ERR_PTR(-EINVAL);

	if (user_size > size)
	return ERR_PTR(-EMSGSIZE);

	data = kzalloc(size + headroom + tailroom, GFP_USER);
	if (!data)
	return ERR_PTR(-ENOMEM);

	if (copy_from_user(data + headroom, data_in, user_size)) {
	kfree(data);
	return ERR_PTR(-EFAULT);
	}

	return data;
	}

	int bpf_prog_test_run_tracing(struct bpf_prog *prog,
	const union bpf_attr *kattr,
	union bpf_attr __user *uattr)
	{
	struct bpf_fentry_test_t arg = {};
	u16 side_effect = 0, ret = 0;
	int b = 2, err = -EFAULT;
	u32 retval = 0;

	if (kattr->test.flags \|\| kattr->test.cpu)
	return -EINVAL;

	switch (prog->expected_attach_type) {
	case BPF_TRACE_FENTRY:
	case BPF_TRACE_FEXIT:
	if (bpf_fentry_test1(1) != 2 \|\|
	bpf_fentry_test2(2, 3) != 5 \|\|
	bpf_fentry_test3(4, 5, 6) != 15 \|\|
	bpf_fentry_test4((void *)7, 8, 9, 10) != 34 \|\|
	bpf_fentry_test5(11, (void *)12, 13, 14, 15) != 65 \|\|
	bpf_fentry_test6(16, (void )17, 18, 19, (void )20, 21) != 111 \|\|
	bpf_fentry_test7((struct bpf_fentry_test_t *)0) != 0 \|\|
	bpf_fentry_test8(&arg) != 0)
	goto out;
	break;
	case BPF_MODIFY_RETURN:
	ret = bpf_modify_return_test(1, &b);
	if (b != 2)
	side_effect = 1;
	break;
	default:
	goto out;
	}

	retval = ((u32)side_effect << 16) \| ret;
	if (copy_to_user(&uattr->test.retval, &retval, sizeof(retval)))
	goto out;

	err = 0;
	out:
	trace_bpf_test_finish(&err);
	return err;
	}

	struct bpf_raw_tp_test_run_info {
	struct bpf_prog *prog;
	void *ctx;
	u32 retval;
	};

	static void
	__bpf_prog_test_run_raw_tp(void *data)
	{
	struct bpf_raw_tp_test_run_info *info = data;

	rcu_read_lock();
	info->retval = BPF_PROG_RUN(info->prog, info->ctx);
	rcu_read_unlock();
	}

	int bpf_prog_test_run_raw_tp(struct bpf_prog *prog,
	const union bpf_attr *kattr,
	union bpf_attr __user *uattr)
	{
	void __user *ctx_in = u64_to_user_ptr(kattr->test.ctx_in);
	__u32 ctx_size_in = kattr->test.ctx_size_in;
	struct bpf_raw_tp_test_run_info info;
	int cpu = kattr->test.cpu, err = 0;
	int current_cpu;

	/* doesn't support data_in/out, ctx_out, duration, or repeat */
	if (kattr->test.data_in \|\| kattr->test.data_out \|\|
	kattr->test.ctx_out \|\| kattr->test.duration \|\|
	kattr->test.repeat)
	return -EINVAL;

	if (ctx_size_in < prog->aux->max_ctx_offset \|\|
	ctx_size_in > MAX_BPF_FUNC_ARGS * sizeof(u64))
	return -EINVAL;

	if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 && cpu != 0)
	return -EINVAL;

	if (ctx_size_in) {
	info.ctx = kzalloc(ctx_size_in, GFP_USER);
	if (!info.ctx)
	return -ENOMEM;
	if (copy_from_user(info.ctx, ctx_in, ctx_size_in)) {
	err = -EFAULT;
	goto out;
	}
	} else {
	info.ctx = NULL;
	}

	info.prog = prog;

	current_cpu = get_cpu();
	if ((kattr->test.flags & BPF_F_TEST_RUN_ON_CPU) == 0 \|\|
	cpu == current_cpu) {
	__bpf_prog_test_run_raw_tp(&info);
	} else if (cpu >= nr_cpu_ids \|\| !cpu_online(cpu)) {
	/* smp_call_function_single() also checks cpu_online()
	* after csd_lock(). However, since cpu is from user
	* space, let's do an extra quick check to filter out
	* invalid value before smp_call_function_single().
	*/
	err = -ENXIO;
	} else {
	err = smp_call_function_single(cpu, __bpf_prog_test_run_raw_tp,
	&info, 1);
	}
	put_cpu();

	if (!err &&
	copy_to_user(&uattr->test.retval, &info.retval, sizeof(u32)))
	err = -EFAULT;

	out:
	kfree(info.ctx);
	return err;
	}

	static void bpf_ctx_init(const union bpf_attr kattr, u32 max_size)
	{
	void __user *data_in = u64_to_user_ptr(kattr->test.ctx_in);
	void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
	u32 size = kattr->test.ctx_size_in;
	void *data;
	int err;

	if (!data_in && !data_out)
	return NULL;

	data = kzalloc(max_size, GFP_USER);
	if (!data)
	return ERR_PTR(-ENOMEM);

	if (data_in) {
	err = bpf_check_uarg_tail_zero(data_in, max_size, size);
	if (err) {
	kfree(data);
	return ERR_PTR(err);
	}

	size = min_t(u32, max_size, size);
	if (copy_from_user(data, data_in, size)) {
	kfree(data);
	return ERR_PTR(-EFAULT);
	}
	}
	return data;
	}

	static int bpf_ctx_finish(const union bpf_attr *kattr,
	union bpf_attr __user uattr, const void data,
	u32 size)
	{
	void __user *data_out = u64_to_user_ptr(kattr->test.ctx_out);
	int err = -EFAULT;
	u32 copy_size = size;

	if (!data \|\| !data_out)
	return 0;

	if (copy_size > kattr->test.ctx_size_out) {
	copy_size = kattr->test.ctx_size_out;
	err = -ENOSPC;
	}

	if (copy_to_user(data_out, data, copy_size))
	goto out;
	if (copy_to_user(&uattr->test.ctx_size_out, &size, sizeof(size)))
	goto out;
	if (err != -ENOSPC)
	err = 0;
	out:
	return err;
	}

	/**
	* range_is_zero - test whether buffer is initialized
	* @buf: buffer to check
	* @from: check from this position
	* @to: check up until (excluding) this position
	*
	* This function returns true if the there is a non-zero byte
	* in the buf in the range [from,to).
	*/
	static inline bool range_is_zero(void *buf, size_t from, size_t to)
	{
	return !memchr_inv((u8 *)buf + from, 0, to - from);
	}

	static int convert___skb_to_skb(struct sk_buff skb, struct __sk_buff __skb)
	{
	struct qdisc_skb_cb cb = (struct qdisc_skb_cb )skb->cb;

	if (!__skb)
	return 0;

	/* make sure the fields we don't use are zeroed */
	if (!range_is_zero(__skb, 0, offsetof(struct __sk_buff, mark)))
	return -EINVAL;

	/* mark is allowed */

	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, mark),
	offsetof(struct __sk_buff, priority)))
	return -EINVAL;

	/* priority is allowed */

	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, priority),
	offsetof(struct __sk_buff, ifindex)))
	return -EINVAL;

	/* ifindex is allowed */

	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, ifindex),
	offsetof(struct __sk_buff, cb)))
	return -EINVAL;

	/* cb is allowed */

	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, cb),
	offsetof(struct __sk_buff, tstamp)))
	return -EINVAL;

	/* tstamp is allowed */
	/* wire_len is allowed */
	/* gso_segs is allowed */

	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_segs),
	offsetof(struct __sk_buff, gso_size)))
	return -EINVAL;

	/* gso_size is allowed */

	if (!range_is_zero(__skb, offsetofend(struct __sk_buff, gso_size),
	sizeof(struct __sk_buff)))
	return -EINVAL;

	skb->mark = __skb->mark;
	skb->priority = __skb->priority;
	skb->tstamp = __skb->tstamp;
	memcpy(&cb->data, __skb->cb, QDISC_CB_PRIV_LEN);

	if (__skb->wire_len == 0) {
	cb->pkt_len = skb->len;
	} else {
	if (__skb->wire_len < skb->len \|\|
	__skb->wire_len > GSO_MAX_SIZE)
	return -EINVAL;
	cb->pkt_len = __skb->wire_len;
	}

	if (__skb->gso_segs > GSO_MAX_SEGS)
	return -EINVAL;
	skb_shinfo(skb)->gso_segs = __skb->gso_segs;
	skb_shinfo(skb)->gso_size = __skb->gso_size;

	return 0;
	}

	static void convert_skb_to___skb(struct sk_buff skb, struct __sk_buff __skb)
	{
	struct qdisc_skb_cb cb = (struct qdisc_skb_cb )skb->cb;

	if (!__skb)
	return;

	__skb->mark = skb->mark;
	__skb->priority = skb->priority;
	__skb->ifindex = skb->dev->ifindex;
	__skb->tstamp = skb->tstamp;
	memcpy(__skb->cb, &cb->data, QDISC_CB_PRIV_LEN);
	__skb->wire_len = cb->pkt_len;
	__skb->gso_segs = skb_shinfo(skb)->gso_segs;
	}

	static struct proto bpf_dummy_proto = {
	.name = "bpf_dummy",
	.owner = THIS_MODULE,
	.obj_size = sizeof(struct sock),
	};

	int bpf_prog_test_run_skb(struct bpf_prog prog, const union bpf_attr kattr,
	union bpf_attr __user *uattr)
	{
	bool is_l2 = false, is_direct_pkt_access = false;
	struct net *net = current->nsproxy->net_ns;
	struct net_device *dev = net->loopback_dev;
	u32 size = kattr->test.data_size_in;
	u32 repeat = kattr->test.repeat;
	struct __sk_buff *ctx = NULL;
	u32 retval, duration;
	int hh_len = ETH_HLEN;
	struct sk_buff *skb;
	struct sock *sk;
	void *data;
	int ret;

	if (kattr->test.flags \|\| kattr->test.cpu)
	return -EINVAL;

	data = bpf_test_init(kattr, size, NET_SKB_PAD + NET_IP_ALIGN,
	SKB_DATA_ALIGN(sizeof(struct skb_shared_info)));
	if (IS_ERR(data))
	return PTR_ERR(data);

	ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
	if (IS_ERR(ctx)) {
	kfree(data);
	return PTR_ERR(ctx);
	}

	switch (prog->type) {
	case BPF_PROG_TYPE_SCHED_CLS:
	case BPF_PROG_TYPE_SCHED_ACT:
	is_l2 = true;
	fallthrough;
	case BPF_PROG_TYPE_LWT_IN:
	case BPF_PROG_TYPE_LWT_OUT:
	case BPF_PROG_TYPE_LWT_XMIT:
	is_direct_pkt_access = true;
	break;
	default:
	break;
	}

	sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
	if (!sk) {
	kfree(data);
	kfree(ctx);
	return -ENOMEM;
	}
	sock_init_data(NULL, sk);

	skb = build_skb(data, 0);
	if (!skb) {
	kfree(data);
	kfree(ctx);
	sk_free(sk);
	return -ENOMEM;
	}
	skb->sk = sk;

	skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
	__skb_put(skb, size);
	if (ctx && ctx->ifindex > 1) {
	dev = dev_get_by_index(net, ctx->ifindex);
	if (!dev) {
	ret = -ENODEV;
	goto out;
	}
	}
	skb->protocol = eth_type_trans(skb, dev);
	skb_reset_network_header(skb);

	switch (skb->protocol) {
	case htons(ETH_P_IP):
	sk->sk_family = AF_INET;
	if (sizeof(struct iphdr) <= skb_headlen(skb)) {
	sk->sk_rcv_saddr = ip_hdr(skb)->saddr;
	sk->sk_daddr = ip_hdr(skb)->daddr;
	}
	break;
	#if IS_ENABLED(CONFIG_IPV6)
	case htons(ETH_P_IPV6):
	sk->sk_family = AF_INET6;
	if (sizeof(struct ipv6hdr) <= skb_headlen(skb)) {
	sk->sk_v6_rcv_saddr = ipv6_hdr(skb)->saddr;
	sk->sk_v6_daddr = ipv6_hdr(skb)->daddr;
	}
	break;
	#endif
	default:
	break;
	}

	if (is_l2)
	__skb_push(skb, hh_len);
	if (is_direct_pkt_access)
	bpf_compute_data_pointers(skb);
	ret = convert___skb_to_skb(skb, ctx);
	if (ret)
	goto out;
	ret = bpf_test_run(prog, skb, repeat, &retval, &duration, false);
	if (ret)
	goto out;
	if (!is_l2) {
	if (skb_headroom(skb) < hh_len) {
	int nhead = HH_DATA_ALIGN(hh_len - skb_headroom(skb));

	if (pskb_expand_head(skb, nhead, 0, GFP_USER)) {
	ret = -ENOMEM;
	goto out;
	}
	}
	memset(__skb_push(skb, hh_len), 0, hh_len);
	}
	convert_skb_to___skb(skb, ctx);

	size = skb->len;
	/* bpf program can never convert linear skb to non-linear */
	if (WARN_ON_ONCE(skb_is_nonlinear(skb)))
	size = skb_headlen(skb);
	ret = bpf_test_finish(kattr, uattr, skb->data, size, retval, duration);
	if (!ret)
	ret = bpf_ctx_finish(kattr, uattr, ctx,
	sizeof(struct __sk_buff));
	out:
	if (dev && dev != net->loopback_dev)
	dev_put(dev);
	kfree_skb(skb);
	sk_free(sk);
	kfree(ctx);
	return ret;
	}

	int bpf_prog_test_run_xdp(struct bpf_prog prog, const union bpf_attr kattr,
	union bpf_attr __user *uattr)
	{
	u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
	u32 headroom = XDP_PACKET_HEADROOM;
	u32 size = kattr->test.data_size_in;
	u32 repeat = kattr->test.repeat;
	struct netdev_rx_queue *rxqueue;
	struct xdp_buff xdp = {};
	u32 retval, duration;
	u32 max_data_sz;
	void *data;
	int ret;

	if (prog->expected_attach_type == BPF_XDP_DEVMAP \|\|
	prog->expected_attach_type == BPF_XDP_CPUMAP)
	return -EINVAL;
	if (kattr->test.ctx_in \|\| kattr->test.ctx_out)
	return -EINVAL;

	/* XDP have extra tailroom as (most) drivers use full page */
	max_data_sz = 4096 - headroom - tailroom;

	data = bpf_test_init(kattr, max_data_sz, headroom, tailroom);
	if (IS_ERR(data))
	return PTR_ERR(data);

	xdp.data_hard_start = data;
	xdp.data = data + headroom;
	xdp.data_meta = xdp.data;
	xdp.data_end = xdp.data + size;
	xdp.frame_sz = headroom + max_data_sz + tailroom;

	rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
	xdp.rxq = &rxqueue->xdp_rxq;
	bpf_prog_change_xdp(NULL, prog);
	ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
	if (ret)
	goto out;
	if (xdp.data != data + headroom \|\| xdp.data_end != xdp.data + size)
	size = xdp.data_end - xdp.data;
	ret = bpf_test_finish(kattr, uattr, xdp.data, size, retval, duration);
	out:
	bpf_prog_change_xdp(prog, NULL);
	kfree(data);
	return ret;
	}

	static int verify_user_bpf_flow_keys(struct bpf_flow_keys *ctx)
	{
	/* make sure the fields we don't use are zeroed */
	if (!range_is_zero(ctx, 0, offsetof(struct bpf_flow_keys, flags)))
	return -EINVAL;

	/* flags is allowed */

	if (!range_is_zero(ctx, offsetofend(struct bpf_flow_keys, flags),
	sizeof(struct bpf_flow_keys)))
	return -EINVAL;

	return 0;
	}

	int bpf_prog_test_run_flow_dissector(struct bpf_prog *prog,
	const union bpf_attr *kattr,
	union bpf_attr __user *uattr)
	{
	u32 size = kattr->test.data_size_in;
	struct bpf_flow_dissector ctx = {};
	u32 repeat = kattr->test.repeat;
	struct bpf_flow_keys *user_ctx;
	struct bpf_flow_keys flow_keys;
	u64 time_start, time_spent = 0;
	const struct ethhdr *eth;
	unsigned int flags = 0;
	u32 retval, duration;
	void *data;
	int ret;
	u32 i;

	if (prog->type != BPF_PROG_TYPE_FLOW_DISSECTOR)
	return -EINVAL;

	if (kattr->test.flags \|\| kattr->test.cpu)
	return -EINVAL;

	if (size < ETH_HLEN)
	return -EINVAL;

	data = bpf_test_init(kattr, size, 0, 0);
	if (IS_ERR(data))
	return PTR_ERR(data);

	eth = (struct ethhdr *)data;

	if (!repeat)
	repeat = 1;

	user_ctx = bpf_ctx_init(kattr, sizeof(struct bpf_flow_keys));
	if (IS_ERR(user_ctx)) {
	kfree(data);
	return PTR_ERR(user_ctx);
	}
	if (user_ctx) {
	ret = verify_user_bpf_flow_keys(user_ctx);
	if (ret)
	goto out;
	flags = user_ctx->flags;
	}

	ctx.flow_keys = &flow_keys;
	ctx.data = data;
	ctx.data_end = (__u8 *)data + size;

	rcu_read_lock();
	preempt_disable();
	time_start = ktime_get_ns();
	for (i = 0; i < repeat; i++) {
	retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
	size, flags);

	if (signal_pending(current)) {
	preempt_enable();
	rcu_read_unlock();

	ret = -EINTR;
	goto out;
	}

	if (need_resched()) {
	time_spent += ktime_get_ns() - time_start;
	preempt_enable();
	rcu_read_unlock();

	cond_resched();

	rcu_read_lock();
	preempt_disable();
	time_start = ktime_get_ns();
	}
	}
	time_spent += ktime_get_ns() - time_start;
	preempt_enable();
	rcu_read_unlock();

	do_div(time_spent, repeat);
	duration = time_spent > U32_MAX ? U32_MAX : (u32)time_spent;

	ret = bpf_test_finish(kattr, uattr, &flow_keys, sizeof(flow_keys),
	retval, duration);
	if (!ret)
	ret = bpf_ctx_finish(kattr, uattr, user_ctx,
	sizeof(struct bpf_flow_keys));

	out:
	kfree(user_ctx);
	kfree(data);
	return ret;
	}