// SPDX-License-Identifier: GPL-2.0-only
/* Copyright (c) 2017 Facebook
 */
#include <linux/bpf.h>
#include <linux/btf.h>
#include <linux/btf_ids.h>
#include <linux/slab.h>
#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/etherdevice.h>
#include <linux/filter.h>
#include <linux/rcupdate_trace.h>
#include <linux/sched/signal.h>
#include <net/bpf_sk_storage.h>
#include <net/hotdata.h>
#include <net/sock.h>
#include <net/tcp.h>
#include <net/net_namespace.h>
#include <net/page_pool/helpers.h>
#include <linux/error-injection.h>
#include <linux/smp.h>
#include <linux/sock_diag.h>
#include <linux/netfilter.h>
#include <net/netdev_rx_queue.h>
#include <net/xdp.h>
#include <net/netfilter/nf_bpf_link.h>

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

struct bpf_test_timer {
        u32 i;
        u64 time_start, time_spent;
};

static void bpf_test_timer_enter(struct bpf_test_timer *t)
        __acquires(rcu)
{
        rcu_read_lock_dont_migrate();
        t->time_start = ktime_get_ns();
}

static void bpf_test_timer_leave(struct bpf_test_timer *t)
        __releases(rcu)
{
        t->time_start = 0;
        rcu_read_unlock_migrate();
}

static bool bpf_test_timer_continue(struct bpf_test_timer *t, int iterations,
                                    u32 repeat, int *err, u32 *duration)
        __must_hold(rcu)
{
        t->i += iterations;
        if (t->i >= repeat) {
                /* We're done. */
                t->time_spent += ktime_get_ns() - t->time_start;
                do_div(t->time_spent, t->i);
                *duration = t->time_spent > U32_MAX ? U32_MAX : (u32)t->time_spent;
                *err = 0;
                goto reset;
        }

        if (signal_pending(current)) {
                /* During iteration: we've been cancelled, abort. */
                *err = -EINTR;
                goto reset;
        }

        if (need_resched()) {
                /* During iteration: we need to reschedule between runs. */
                t->time_spent += ktime_get_ns() - t->time_start;
                bpf_test_timer_leave(t);
                cond_resched();
                bpf_test_timer_enter(t);
        }

        /* Do another round. */
        return true;

reset:
        t->i = 0;
        return false;
}

/* We put this struct at the head of each page with a context and frame
 * initialised when the page is allocated, so we don't have to do this on each
 * repetition of the test run.
 */
struct xdp_page_head {
        struct xdp_buff orig_ctx;
        struct xdp_buff ctx;
        union {
                /* ::data_hard_start starts here */
                DECLARE_FLEX_ARRAY(struct xdp_frame, frame);
                DECLARE_FLEX_ARRAY(u8, data);
        };
};

struct xdp_test_data {
        struct xdp_buff *orig_ctx;
        struct xdp_rxq_info rxq;
        struct net_device *dev;
        struct page_pool *pp;
        struct xdp_frame **frames;
        struct sk_buff **skbs;
        struct xdp_mem_info mem;
        u32 batch_size;
        u32 frame_cnt;
};

/* tools/testing/selftests/bpf/prog_tests/xdp_do_redirect.c:%MAX_PKT_SIZE
 * must be updated accordingly this gets changed, otherwise BPF selftests
 * will fail.
 */
#define TEST_XDP_FRAME_SIZE (PAGE_SIZE - sizeof(struct xdp_page_head))
#define TEST_XDP_MAX_BATCH 256

static void xdp_test_run_init_page(netmem_ref netmem, void *arg)
{
        struct xdp_page_head *head =
                phys_to_virt(page_to_phys(netmem_to_page(netmem)));
        struct xdp_buff *new_ctx, *orig_ctx;
        u32 headroom = XDP_PACKET_HEADROOM;
        struct xdp_test_data *xdp = arg;
        size_t frm_len, meta_len;
        struct xdp_frame *frm;
        void *data;

        orig_ctx = xdp->orig_ctx;
        frm_len = orig_ctx->data_end - orig_ctx->data_meta;
        meta_len = orig_ctx->data - orig_ctx->data_meta;
        headroom -= meta_len;

        new_ctx = &head->ctx;
        frm = head->frame;
        data = head->data;
        memcpy(data + headroom, orig_ctx->data_meta, frm_len);

        xdp_init_buff(new_ctx, TEST_XDP_FRAME_SIZE, &xdp->rxq);
        xdp_prepare_buff(new_ctx, data, headroom, frm_len, true);
        new_ctx->data = new_ctx->data_meta + meta_len;

        xdp_update_frame_from_buff(new_ctx, frm);
        frm->mem_type = new_ctx->rxq->mem.type;

        memcpy(&head->orig_ctx, new_ctx, sizeof(head->orig_ctx));
}

static int xdp_test_run_setup(struct xdp_test_data *xdp, struct xdp_buff *orig_ctx)
{
        struct page_pool *pp;
        int err = -ENOMEM;
        struct page_pool_params pp_params = {
                .order = 0,
                .flags = 0,
                .pool_size = xdp->batch_size,
                .nid = NUMA_NO_NODE,
                .init_callback = xdp_test_run_init_page,
                .init_arg = xdp,
        };

        xdp->frames = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
        if (!xdp->frames)
                return -ENOMEM;

        xdp->skbs = kvmalloc_array(xdp->batch_size, sizeof(void *), GFP_KERNEL);
        if (!xdp->skbs)
                goto err_skbs;

        pp = page_pool_create(&pp_params);
        if (IS_ERR(pp)) {
                err = PTR_ERR(pp);
                goto err_pp;
        }

        /* will copy 'mem.id' into pp->xdp_mem_id */
        err = xdp_reg_mem_model(&xdp->mem, MEM_TYPE_PAGE_POOL, pp);
        if (err)
                goto err_mmodel;

        xdp->pp = pp;

        /* We create a 'fake' RXQ referencing the original dev, but with an
         * xdp_mem_info pointing to our page_pool
         */
        xdp_rxq_info_reg(&xdp->rxq, orig_ctx->rxq->dev, 0, 0);
        xdp->rxq.mem.type = MEM_TYPE_PAGE_POOL;
        xdp->rxq.mem.id = pp->xdp_mem_id;
        xdp->dev = orig_ctx->rxq->dev;
        xdp->orig_ctx = orig_ctx;

        return 0;

err_mmodel:
        page_pool_destroy(pp);
err_pp:
        kvfree(xdp->skbs);
err_skbs:
        kvfree(xdp->frames);
        return err;
}

static void xdp_test_run_teardown(struct xdp_test_data *xdp)
{
        xdp_unreg_mem_model(&xdp->mem);
        page_pool_destroy(xdp->pp);
        kfree(xdp->frames);
        kfree(xdp->skbs);
}

static bool frame_was_changed(const struct xdp_page_head *head)
{
        /* xdp_scrub_frame() zeroes the data pointer, flags is the last field,
         * i.e. has the highest chances to be overwritten. If those two are
         * untouched, it's most likely safe to skip the context reset.
         */
        return head->frame->data != head->orig_ctx.data ||
               head->frame->flags != head->orig_ctx.flags;
}

static bool ctx_was_changed(struct xdp_page_head *head)
{
        return head->orig_ctx.data != head->ctx.data ||
                head->orig_ctx.data_meta != head->ctx.data_meta ||
                head->orig_ctx.data_end != head->ctx.data_end;
}

static void reset_ctx(struct xdp_page_head *head)
{
        if (likely(!frame_was_changed(head) && !ctx_was_changed(head)))
                return;

        head->ctx.data = head->orig_ctx.data;
        head->ctx.data_meta = head->orig_ctx.data_meta;
        head->ctx.data_end = head->orig_ctx.data_end;
        xdp_update_frame_from_buff(&head->ctx, head->frame);
        head->frame->mem_type = head->orig_ctx.rxq->mem.type;
}

static int xdp_recv_frames(struct xdp_frame **frames, int nframes,
                           struct sk_buff **skbs,
                           struct net_device *dev)
{
        gfp_t gfp = __GFP_ZERO | GFP_ATOMIC;
        int i, n;
        LIST_HEAD(list);

        n = kmem_cache_alloc_bulk(net_hotdata.skbuff_cache, gfp, nframes,
                                  (void **)skbs);
        if (unlikely(n == 0)) {
                for (i = 0; i < nframes; i++)
                        xdp_return_frame(frames[i]);
                return -ENOMEM;
        }

        for (i = 0; i < nframes; i++) {
                struct xdp_frame *xdpf = frames[i];
                struct sk_buff *skb = skbs[i];

                skb = __xdp_build_skb_from_frame(xdpf, skb, dev);
                if (!skb) {
                        xdp_return_frame(xdpf);
                        continue;
                }

                list_add_tail(&skb->list, &list);
        }
        netif_receive_skb_list(&list);

        return 0;
}

static int xdp_test_run_batch(struct xdp_test_data *xdp, struct bpf_prog *prog,
                              u32 repeat)
{
        struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
        int err = 0, act, ret, i, nframes = 0, batch_sz;
        struct xdp_frame **frames = xdp->frames;
        struct bpf_redirect_info *ri;
        struct xdp_page_head *head;
        struct xdp_frame *frm;
        bool redirect = false;
        struct xdp_buff *ctx;
        struct page *page;

        batch_sz = min_t(u32, repeat, xdp->batch_size);

        local_bh_disable();
        bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);
        ri = bpf_net_ctx_get_ri();
        xdp_set_return_frame_no_direct();

        for (i = 0; i < batch_sz; i++) {
                page = page_pool_dev_alloc_pages(xdp->pp);
                if (!page) {
                        err = -ENOMEM;
                        goto out;
                }

                head = phys_to_virt(page_to_phys(page));
                reset_ctx(head);
                ctx = &head->ctx;
                frm = head->frame;
                xdp->frame_cnt++;

                act = bpf_prog_run_xdp(prog, ctx);

                /* if program changed pkt bounds we need to update the xdp_frame */
                if (unlikely(ctx_was_changed(head))) {
                        ret = xdp_update_frame_from_buff(ctx, frm);
                        if (ret) {
                                xdp_return_buff(ctx);
                                continue;
                        }
                }

                switch (act) {
                case XDP_TX:
                        /* we can't do a real XDP_TX since we're not in the
                         * driver, so turn it into a REDIRECT back to the same
                         * index
                         */
                        ri->tgt_index = xdp->dev->ifindex;
                        ri->map_id = INT_MAX;
                        ri->map_type = BPF_MAP_TYPE_UNSPEC;
                        fallthrough;
                case XDP_REDIRECT:
                        redirect = true;
                        ret = xdp_do_redirect_frame(xdp->dev, ctx, frm, prog);
                        if (ret)
                                xdp_return_buff(ctx);
                        break;
                case XDP_PASS:
                        frames[nframes++] = frm;
                        break;
                default:
                        bpf_warn_invalid_xdp_action(NULL, prog, act);
                        fallthrough;
                case XDP_DROP:
                        xdp_return_buff(ctx);
                        break;
                }
        }

out:
        if (redirect)
                xdp_do_flush();
        if (nframes) {
                ret = xdp_recv_frames(frames, nframes, xdp->skbs, xdp->dev);
                if (ret)
                        err = ret;
        }

        xdp_clear_return_frame_no_direct();
        bpf_net_ctx_clear(bpf_net_ctx);
        local_bh_enable();
        return err;
}

static int bpf_test_run_xdp_live(struct bpf_prog *prog, struct xdp_buff *ctx,
                                 u32 repeat, u32 batch_size, u32 *time)

{
        struct xdp_test_data xdp = { .batch_size = batch_size };
        struct bpf_test_timer t = {};
        int ret;

        if (!repeat)
                repeat = 1;

        ret = xdp_test_run_setup(&xdp, ctx);
        if (ret)
                return ret;

        bpf_test_timer_enter(&t);
        do {
                xdp.frame_cnt = 0;
                ret = xdp_test_run_batch(&xdp, prog, repeat - t.i);
                if (unlikely(ret < 0))
                        break;
        } while (bpf_test_timer_continue(&t, xdp.frame_cnt, repeat, &ret, time));
        bpf_test_timer_leave(&t);

        xdp_test_run_teardown(&xdp);
        return ret;
}

static int bpf_test_run(struct bpf_prog *prog, void *ctx, u32 repeat,
                        u32 *retval, u32 *time, bool xdp)
{
        struct bpf_net_context __bpf_net_ctx, *bpf_net_ctx;
        struct bpf_prog_array_item item = {.prog = prog};
        struct bpf_run_ctx *old_ctx;
        struct bpf_cg_run_ctx run_ctx;
        struct bpf_test_timer t = {};
        enum bpf_cgroup_storage_type stype;
        int ret;

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

        if (!repeat)
                repeat = 1;

        bpf_test_timer_enter(&t);
        old_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);
        do {
                run_ctx.prog_item = &item;
                local_bh_disable();
                bpf_net_ctx = bpf_net_ctx_set(&__bpf_net_ctx);

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

                bpf_net_ctx_clear(bpf_net_ctx);
                local_bh_enable();
        } while (bpf_test_timer_continue(&t, 1, repeat, &ret, time));
        bpf_reset_run_ctx(old_ctx);
        bpf_test_timer_leave(&t);

        for_each_cgroup_storage_type(stype)
                bpf_cgroup_storage_free(item.cgroup_storage[stype]);

        return ret;
}

static int bpf_test_finish(const union bpf_attr *kattr,
                           union bpf_attr __user *uattr, const void *data,
                           struct skb_shared_info *sinfo, u32 size, u32 frag_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) {
                int len = sinfo ? copy_size - frag_size : copy_size;

                if (len < 0) {
                        err = -ENOSPC;
                        goto out;
                }

                if (copy_to_user(data_out, data, len))
                        goto out;

                if (sinfo) {
                        int i, offset = len;
                        u32 data_len;

                        for (i = 0; i < sinfo->nr_frags; i++) {
                                skb_frag_t *frag = &sinfo->frags[i];

                                if (offset >= copy_size) {
                                        err = -ENOSPC;
                                        break;
                                }

                                data_len = min_t(u32, copy_size - offset,
                                                 skb_frag_size(frag));

                                if (copy_to_user(data_out + offset,
                                                 skb_frag_address(frag),
                                                 data_len))
                                        goto out;

                                offset += data_len;
                        }
                }
        }

        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.
 */
__bpf_kfunc_start_defs();

__bpf_kfunc int bpf_fentry_test1(int a)
{
        return a + 1;
}
EXPORT_SYMBOL_GPL(bpf_fentry_test1);

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

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

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

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

noinline int 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;
};

noinline int bpf_fentry_test7(struct bpf_fentry_test_t *arg)
{
        asm volatile ("" : "+r"(arg));
        return (long)arg;
}

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

__bpf_kfunc u32 bpf_fentry_test9(u32 *a)
{
        return *a;
}

noinline int bpf_fentry_test10(const void *a)
{
        return (long)a;
}

noinline void bpf_fentry_test_sinfo(struct skb_shared_info *sinfo)
{
}

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

__bpf_kfunc int bpf_modify_return_test2(int a, int *b, short c, int d,
                                        void *e, char f, int g)
{
        *b += 1;
        return a + *b + c + d + (long)e + f + g;
}

__bpf_kfunc int bpf_modify_return_test_tp(int nonce)
{
        trace_bpf_trigger_tp(nonce);

        return nonce;
}

noinline int bpf_fentry_shadow_test(int a)
{
        return a + 1;
}

struct prog_test_member1 {
        int a;
};

struct prog_test_member {
        struct prog_test_member1 m;
        int c;
};

struct prog_test_ref_kfunc {
        int a;
        int b;
        struct prog_test_member memb;
        struct prog_test_ref_kfunc *next;
        refcount_t cnt;
};

__bpf_kfunc void bpf_kfunc_call_test_release(struct prog_test_ref_kfunc *p)
{
        refcount_dec(&p->cnt);
}

__bpf_kfunc void bpf_kfunc_call_test_release_dtor(void *p)
{
        bpf_kfunc_call_test_release(p);
}
CFI_NOSEAL(bpf_kfunc_call_test_release_dtor);

__bpf_kfunc void bpf_kfunc_call_memb_release(struct prog_test_member *p)
{
}

__bpf_kfunc void bpf_kfunc_call_memb_release_dtor(void *p)
{
}
CFI_NOSEAL(bpf_kfunc_call_memb_release_dtor);

__bpf_kfunc_end_defs();

BTF_KFUNCS_START(bpf_test_modify_return_ids)
BTF_ID_FLAGS(func, bpf_modify_return_test)
BTF_ID_FLAGS(func, bpf_modify_return_test2)
BTF_ID_FLAGS(func, bpf_modify_return_test_tp)
BTF_ID_FLAGS(func, bpf_fentry_test1, KF_SLEEPABLE)
BTF_KFUNCS_END(bpf_test_modify_return_ids)

static const struct btf_kfunc_id_set bpf_test_modify_return_set = {
        .owner = THIS_MODULE,
        .set   = &bpf_test_modify_return_ids,
};

BTF_KFUNCS_START(test_sk_check_kfunc_ids)
BTF_ID_FLAGS(func, bpf_kfunc_call_test_release, KF_RELEASE)
BTF_ID_FLAGS(func, bpf_kfunc_call_memb_release, KF_RELEASE)
BTF_KFUNCS_END(test_sk_check_kfunc_ids)

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

        if (user_size > PAGE_SIZE - headroom - tailroom)
                return ERR_PTR(-EINVAL);

        size = SKB_DATA_ALIGN(size);
        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 || kattr->test.batch_size)
                return -EINVAL;

        switch (prog->expected_attach_type) {
        case BPF_TRACE_FENTRY:
        case BPF_TRACE_FEXIT:
        case BPF_TRACE_FSESSION:
                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 ||
                    bpf_fentry_test9(&retval) != 0 ||
                    bpf_fentry_test10((void *)0) != 0)
                        goto out;
                break;
        case BPF_MODIFY_RETURN:
                ret = bpf_modify_return_test(1, &b);
                if (b != 2)
                        side_effect++;
                b = 2;
                ret += bpf_modify_return_test2(1, &b, 3, 4, (void *)5, 6, 7);
                if (b != 2)
                        side_effect++;
                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;
        struct bpf_trace_run_ctx run_ctx = {};
        struct bpf_run_ctx *old_run_ctx;

        old_run_ctx = bpf_set_run_ctx(&run_ctx.run_ctx);

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

        bpf_reset_run_ctx(old_run_ctx);
}

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 || kattr->test.batch_size)
                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 = memdup_user(ctx_in, ctx_size_in);
                if (IS_ERR(info.ctx))
                        return PTR_ERR(info.ctx);
        } 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;

        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(USER_BPFPTR(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 */
        /* ingress_ifindex is allowed */
        /* 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, data_end)))
                return -EINVAL;

        /* data_end is allowed, but not copied to skb */

        if (!range_is_zero(__skb, offsetofend(struct __sk_buff, data_end),
                           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),
                           offsetof(struct __sk_buff, hwtstamp)))
                return -EINVAL;

        /* hwtstamp is allowed */

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

        skb->mark = __skb->mark;
        skb->priority = __skb->priority;
        skb->skb_iif = __skb->ingress_ifindex;
        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_LEGACY_MAX_SIZE)
                        return -EINVAL;
                cb->pkt_len = __skb->wire_len;
        }

        if (__skb->gso_segs > GSO_MAX_SEGS)
                return -EINVAL;

        /* Currently GSO type is zero/unset. If this gets extended with
         * a small list of accepted GSO types in future, the filter for
         * an unset GSO type in bpf_clone_redirect() can be lifted.
         */
        skb_shinfo(skb)->gso_segs = __skb->gso_segs;
        skb_shinfo(skb)->gso_size = __skb->gso_size;
        skb_shinfo(skb)->hwtstamps.hwtstamp = __skb->hwtstamp;

        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->ingress_ifindex = skb->skb_iif;
        __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;
        __skb->hwtstamp = skb_shinfo(skb)->hwtstamps.hwtstamp;
}

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, is_lwt = false;
        u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
        struct net *net = current->nsproxy->net_ns;
        struct net_device *dev = net->loopback_dev;
        u32 headroom = NET_SKB_PAD + NET_IP_ALIGN;
        u32 linear_sz = kattr->test.data_size_in;
        u32 repeat = kattr->test.repeat;
        struct __sk_buff *ctx = NULL;
        struct sk_buff *skb = NULL;
        struct sock *sk = NULL;
        u32 retval, duration;
        int hh_len = ETH_HLEN;
        void *data = NULL;
        int ret;

        if ((kattr->test.flags & ~BPF_F_TEST_SKB_CHECKSUM_COMPLETE) ||
            kattr->test.cpu || kattr->test.batch_size)
                return -EINVAL;

        if (kattr->test.data_size_in < ETH_HLEN)
                return -EINVAL;

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

        ctx = bpf_ctx_init(kattr, sizeof(struct __sk_buff));
        if (IS_ERR(ctx))
                return PTR_ERR(ctx);

        if (ctx) {
                if (ctx->data_end > kattr->test.data_size_in || ctx->data || ctx->data_meta) {
                        ret = -EINVAL;
                        goto out;
                }
                if (ctx->data_end) {
                        /* Non-linear LWT test_run is unsupported for now. */
                        if (is_lwt) {
                                ret = -EINVAL;
                                goto out;
                        }
                        linear_sz = max(ETH_HLEN, ctx->data_end);
                }
        }

        linear_sz = min_t(u32, linear_sz, PAGE_SIZE - headroom - tailroom);

        data = bpf_test_init(kattr, linear_sz, linear_sz, headroom, tailroom);
        if (IS_ERR(data)) {
                ret = PTR_ERR(data);
                data = NULL;
                goto out;
        }

        sk = sk_alloc(net, AF_UNSPEC, GFP_USER, &bpf_dummy_proto, 1);
        if (!sk) {
                ret = -ENOMEM;
                goto out;
        }
        sock_init_data(NULL, sk);

        skb = slab_build_skb(data);
        if (!skb) {
                ret = -ENOMEM;
                goto out;
        }
        skb->sk = sk;

        data = NULL; /* data released via kfree_skb */

        skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
        __skb_put(skb, linear_sz);

        if (unlikely(kattr->test.data_size_in > linear_sz)) {
                void __user *data_in = u64_to_user_ptr(kattr->test.data_in);
                struct skb_shared_info *sinfo = skb_shinfo(skb);
                u32 copied = linear_sz;

                while (copied < kattr->test.data_size_in) {
                        struct page *page;
                        u32 data_len;

                        if (sinfo->nr_frags == MAX_SKB_FRAGS) {
                                ret = -ENOMEM;
                                goto out;
                        }

                        page = alloc_page(GFP_KERNEL);
                        if (!page) {
                                ret = -ENOMEM;
                                goto out;
                        }

                        data_len = min_t(u32, kattr->test.data_size_in - copied,
                                         PAGE_SIZE);
                        skb_fill_page_desc(skb, sinfo->nr_frags, page, 0, data_len);

                        if (copy_from_user(page_address(page), data_in + copied,
                                           data_len)) {
                                ret = -EFAULT;
                                goto out;
                        }
                        skb->data_len += data_len;
                        skb->truesize += PAGE_SIZE;
                        skb->len += data_len;
                        copied += data_len;
                }
        }

        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;

        if (kattr->test.flags & BPF_F_TEST_SKB_CHECKSUM_COMPLETE) {
                const int off = skb_network_offset(skb);
                int len = skb->len - off;

                skb->csum = skb_checksum(skb, off, len, 0);
                skb->ip_summed = CHECKSUM_COMPLETE;
        }

        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);
        }

        if (kattr->test.flags & BPF_F_TEST_SKB_CHECKSUM_COMPLETE) {
                const int off = skb_network_offset(skb);
                int len = skb->len - off;
                __wsum csum;

                csum = skb_checksum(skb, off, len, 0);

                if (csum_fold(skb->csum) != csum_fold(csum)) {
                        ret = -EBADMSG;
                        goto out;
                }
        }

        convert_skb_to___skb(skb, ctx);

        if (skb_is_nonlinear(skb))
                /* bpf program can never convert linear skb to non-linear */
                WARN_ON_ONCE(linear_sz == kattr->test.data_size_in);
        ret = bpf_test_finish(kattr, uattr, skb->data, skb_shinfo(skb), skb->len,
                              skb->data_len, 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);
        kfree(data);
        if (sk)
                sk_free(sk);
        kfree(ctx);
        return ret;
}

static int xdp_convert_md_to_buff(struct xdp_md *xdp_md, struct xdp_buff *xdp)
{
        unsigned int ingress_ifindex, rx_queue_index;
        struct netdev_rx_queue *rxqueue;
        struct net_device *device;

        if (!xdp_md)
                return 0;

        if (xdp_md->egress_ifindex != 0)
                return -EINVAL;

        ingress_ifindex = xdp_md->ingress_ifindex;
        rx_queue_index = xdp_md->rx_queue_index;

        if (!ingress_ifindex && rx_queue_index)
                return -EINVAL;

        if (ingress_ifindex) {
                device = dev_get_by_index(current->nsproxy->net_ns,
                                          ingress_ifindex);
                if (!device)
                        return -ENODEV;

                if (rx_queue_index >= device->real_num_rx_queues)
                        goto free_dev;

                rxqueue = __netif_get_rx_queue(device, rx_queue_index);

                if (!xdp_rxq_info_is_reg(&rxqueue->xdp_rxq))
                        goto free_dev;

                xdp->rxq = &rxqueue->xdp_rxq;
                /* The device is now tracked in the xdp->rxq for later
                 * dev_put()
                 */
        }

        xdp->data = xdp->data_meta + xdp_md->data;
        return 0;

free_dev:
        dev_put(device);
        return -EINVAL;
}

static void xdp_convert_buff_to_md(struct xdp_buff *xdp, struct xdp_md *xdp_md)
{
        if (!xdp_md)
                return;

        xdp_md->data = xdp->data - xdp->data_meta;
        xdp_md->data_end = xdp->data_end - xdp->data_meta;

        if (xdp_md->ingress_ifindex)
                dev_put(xdp->rxq->dev);
}

int bpf_prog_test_run_xdp(struct bpf_prog *prog, const union bpf_attr *kattr,
                          union bpf_attr __user *uattr)
{
        bool do_live = (kattr->test.flags & BPF_F_TEST_XDP_LIVE_FRAMES);
        u32 tailroom = SKB_DATA_ALIGN(sizeof(struct skb_shared_info));
        u32 retval = 0, meta_sz = 0, duration, max_linear_sz, size;
        u32 linear_sz = kattr->test.data_size_in;
        u32 batch_size = kattr->test.batch_size;
        u32 headroom = XDP_PACKET_HEADROOM;
        u32 repeat = kattr->test.repeat;
        struct netdev_rx_queue *rxqueue;
        struct skb_shared_info *sinfo;
        struct xdp_buff xdp = {};
        int i, ret = -EINVAL;
        struct xdp_md *ctx;
        void *data;

        if (prog->expected_attach_type == BPF_XDP_DEVMAP ||
            prog->expected_attach_type == BPF_XDP_CPUMAP)
                return -EINVAL;

        if (kattr->test.flags & ~BPF_F_TEST_XDP_LIVE_FRAMES)
                return -EINVAL;

        if (bpf_prog_is_dev_bound(prog->aux))
                return -EINVAL;

        if (do_live) {
                if (!batch_size)
                        batch_size = NAPI_POLL_WEIGHT;
                else if (batch_size > TEST_XDP_MAX_BATCH)
                        return -E2BIG;
        } else if (batch_size) {
                return -EINVAL;
        }

        ctx = bpf_ctx_init(kattr, sizeof(struct xdp_md));
        if (IS_ERR(ctx))
                return PTR_ERR(ctx);

        if (ctx) {
                /* There can't be user provided data before the meta data */
                if (ctx->data_meta || ctx->data_end > kattr->test.data_size_in ||
                    ctx->data > ctx->data_end ||
                    (do_live && (kattr->test.data_out || kattr->test.ctx_out)))
                        goto free_ctx;

                meta_sz = ctx->data;
                if (xdp_metalen_invalid(meta_sz) || meta_sz > headroom - sizeof(struct xdp_frame))
                        goto free_ctx;

                /* Meta data is allocated from the headroom */
                headroom -= meta_sz;
                linear_sz = ctx->data_end;
        }

        /* The xdp_page_head structure takes up space in each page, limiting the
         * size of the packet data; add the extra size to headroom here to make
         * sure it's accounted in the length checks below, but not in the
         * metadata size check above.
         */
        if (do_live)
                headroom += sizeof(struct xdp_page_head);

        max_linear_sz = PAGE_SIZE - headroom - tailroom;
        linear_sz = min_t(u32, linear_sz, max_linear_sz);

        /* disallow live data mode for jumbo frames */
        if (do_live && kattr->test.data_size_in > linear_sz)
                goto free_ctx;

        if (kattr->test.data_size_in - meta_sz < ETH_HLEN)
                goto free_ctx;

        data = bpf_test_init(kattr, linear_sz, max_linear_sz, headroom, tailroom);
        if (IS_ERR(data)) {
                ret = PTR_ERR(data);
                goto free_ctx;
        }

        rxqueue = __netif_get_rx_queue(current->nsproxy->net_ns->loopback_dev, 0);
        rxqueue->xdp_rxq.frag_size = PAGE_SIZE;
        xdp_init_buff(&xdp, rxqueue->xdp_rxq.frag_size, &rxqueue->xdp_rxq);
        xdp_prepare_buff(&xdp, data, headroom, linear_sz, true);
        sinfo = xdp_get_shared_info_from_buff(&xdp);

        ret = xdp_convert_md_to_buff(ctx, &xdp);
        if (ret)
                goto free_data;

        size = linear_sz;
        if (unlikely(kattr->test.data_size_in > size)) {
                void __user *data_in = u64_to_user_ptr(kattr->test.data_in);

                while (size < kattr->test.data_size_in) {
                        struct page *page;
                        skb_frag_t *frag;
                        u32 data_len;

                        if (sinfo->nr_frags == MAX_SKB_FRAGS) {
                                ret = -ENOMEM;
                                goto out_put_dev;
                        }

                        page = alloc_page(GFP_KERNEL);
                        if (!page) {
                                ret = -ENOMEM;
                                goto out_put_dev;
                        }

                        frag = &sinfo->frags[sinfo->nr_frags++];

                        data_len = min_t(u32, kattr->test.data_size_in - size,
                                         PAGE_SIZE);
                        skb_frag_fill_page_desc(frag, page, 0, data_len);

                        if (copy_from_user(page_address(page), data_in + size,
                                           data_len)) {
                                ret = -EFAULT;
                                goto out_put_dev;
                        }
                        sinfo->xdp_frags_size += data_len;
                        size += data_len;
                }
                xdp_buff_set_frags_flag(&xdp);
        }

        if (repeat > 1)
                bpf_prog_change_xdp(NULL, prog);

        if (do_live)
                ret = bpf_test_run_xdp_live(prog, &xdp, repeat, batch_size, &duration);
        else
                ret = bpf_test_run(prog, &xdp, repeat, &retval, &duration, true);
out_put_dev:
        /* We convert the xdp_buff back to an xdp_md before checking the return
         * code so the reference count of any held netdevice will be decremented
         * even if the test run failed.
         */
        xdp_convert_buff_to_md(&xdp, ctx);
        if (ret)
                goto out;

        size = xdp.data_end - xdp.data_meta + sinfo->xdp_frags_size;
        ret = bpf_test_finish(kattr, uattr, xdp.data_meta, sinfo, size, sinfo->xdp_frags_size,
                              retval, duration);
        if (!ret)
                ret = bpf_ctx_finish(kattr, uattr, ctx,
                                     sizeof(struct xdp_md));

out:
        if (repeat > 1)
                bpf_prog_change_xdp(prog, NULL);
free_data:
        for (i = 0; i < sinfo->nr_frags; i++)
                __free_page(skb_frag_page(&sinfo->frags[i]));
        kfree(data);
free_ctx:
        kfree(ctx);
        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)
{
        struct bpf_test_timer t = {};
        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;
        const struct ethhdr *eth;
        unsigned int flags = 0;
        u32 retval, duration;
        void *data;
        int ret;

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

        if (size < ETH_HLEN)
                return -EINVAL;

        data = bpf_test_init(kattr, kattr->test.data_size_in, 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;

        bpf_test_timer_enter(&t);
        do {
                retval = bpf_flow_dissect(prog, &ctx, eth->h_proto, ETH_HLEN,
                                          size, flags);
        } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
        bpf_test_timer_leave(&t);

        if (ret < 0)
                goto out;

        ret = bpf_test_finish(kattr, uattr, &flow_keys, NULL,
                              sizeof(flow_keys), 0, 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;
}

int bpf_prog_test_run_sk_lookup(struct bpf_prog *prog, const union bpf_attr *kattr,
                                union bpf_attr __user *uattr)
{
        struct bpf_test_timer t = {};
        struct bpf_prog_array *progs = NULL;
        struct bpf_sk_lookup_kern ctx = {};
        u32 repeat = kattr->test.repeat;
        struct bpf_sk_lookup *user_ctx;
        u32 retval, duration;
        int ret = -EINVAL;

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

        if (kattr->test.data_in || kattr->test.data_size_in || kattr->test.data_out ||
            kattr->test.data_size_out)
                return -EINVAL;

        if (!repeat)
                repeat = 1;

        user_ctx = bpf_ctx_init(kattr, sizeof(*user_ctx));
        if (IS_ERR(user_ctx))
                return PTR_ERR(user_ctx);

        if (!user_ctx)
                return -EINVAL;

        if (user_ctx->sk)
                goto out;

        if (!range_is_zero(user_ctx, offsetofend(typeof(*user_ctx), local_port), sizeof(*user_ctx)))
                goto out;

        if (user_ctx->local_port > U16_MAX) {
                ret = -ERANGE;
                goto out;
        }

        ctx.family = (u16)user_ctx->family;
        ctx.protocol = (u16)user_ctx->protocol;
        ctx.dport = (u16)user_ctx->local_port;
        ctx.sport = user_ctx->remote_port;

        switch (ctx.family) {
        case AF_INET:
                ctx.v4.daddr = (__force __be32)user_ctx->local_ip4;
                ctx.v4.saddr = (__force __be32)user_ctx->remote_ip4;
                break;

#if IS_ENABLED(CONFIG_IPV6)
        case AF_INET6:
                ctx.v6.daddr = (struct in6_addr *)user_ctx->local_ip6;
                ctx.v6.saddr = (struct in6_addr *)user_ctx->remote_ip6;
                break;
#endif

        default:
                ret = -EAFNOSUPPORT;
                goto out;
        }

        progs = bpf_prog_array_alloc(1, GFP_KERNEL);
        if (!progs) {
                ret = -ENOMEM;
                goto out;
        }

        progs->items[0].prog = prog;

        bpf_test_timer_enter(&t);
        do {
                ctx.selected_sk = NULL;
                retval = BPF_PROG_SK_LOOKUP_RUN_ARRAY(progs, ctx, bpf_prog_run);
        } while (bpf_test_timer_continue(&t, 1, repeat, &ret, &duration));
        bpf_test_timer_leave(&t);

        if (ret < 0)
                goto out;

        user_ctx->cookie = 0;
        if (ctx.selected_sk) {
                if (ctx.selected_sk->sk_reuseport && !ctx.no_reuseport) {
                        ret = -EOPNOTSUPP;
                        goto out;
                }

                user_ctx->cookie = sock_gen_cookie(ctx.selected_sk);
        }

        ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, 0, retval, duration);
        if (!ret)
                ret = bpf_ctx_finish(kattr, uattr, user_ctx, sizeof(*user_ctx));

out:
        bpf_prog_array_free(progs);
        kfree(user_ctx);
        return ret;
}

int bpf_prog_test_run_syscall(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;
        void *ctx = NULL;
        u32 retval;
        int err = 0;

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

        if (ctx_size_in < prog->aux->max_ctx_offset ||
            ctx_size_in > U16_MAX)
                return -EINVAL;

        if (ctx_size_in) {
                ctx = memdup_user(ctx_in, ctx_size_in);
                if (IS_ERR(ctx))
                        return PTR_ERR(ctx);
        }

        rcu_read_lock_trace();
        retval = bpf_prog_run_pin_on_cpu(prog, ctx);
        rcu_read_unlock_trace();

        if (copy_to_user(&uattr->test.retval, &retval, sizeof(u32))) {
                err = -EFAULT;
                goto out;
        }
        if (ctx_size_in)
                if (copy_to_user(ctx_in, ctx, ctx_size_in))
                        err = -EFAULT;
out:
        kfree(ctx);
        return err;
}

static int verify_and_copy_hook_state(struct nf_hook_state *state,
                                      const struct nf_hook_state *user,
                                      struct net_device *dev)
{
        if (user->in || user->out)
                return -EINVAL;

        if (user->net || user->sk || user->okfn)
                return -EINVAL;

        switch (user->pf) {
        case NFPROTO_IPV4:
        case NFPROTO_IPV6:
                switch (state->hook) {
                case NF_INET_PRE_ROUTING:
                        state->in = dev;
                        break;
                case NF_INET_LOCAL_IN:
                        state->in = dev;
                        break;
                case NF_INET_FORWARD:
                        state->in = dev;
                        state->out = dev;
                        break;
                case NF_INET_LOCAL_OUT:
                        state->out = dev;
                        break;
                case NF_INET_POST_ROUTING:
                        state->out = dev;
                        break;
                }

                break;
        default:
                return -EINVAL;
        }

        state->pf = user->pf;
        state->hook = user->hook;

        return 0;
}

static __be16 nfproto_eth(int nfproto)
{
        switch (nfproto) {
        case NFPROTO_IPV4:
                return htons(ETH_P_IP);
        case NFPROTO_IPV6:
                break;
        }

        return htons(ETH_P_IPV6);
}

int bpf_prog_test_run_nf(struct bpf_prog *prog,
                         const union bpf_attr *kattr,
                         union bpf_attr __user *uattr)
{
        struct net *net = current->nsproxy->net_ns;
        struct net_device *dev = net->loopback_dev;
        struct nf_hook_state *user_ctx, hook_state = {
                .pf = NFPROTO_IPV4,
                .hook = NF_INET_LOCAL_OUT,
        };
        u32 size = kattr->test.data_size_in;
        u32 repeat = kattr->test.repeat;
        struct bpf_nf_ctx ctx = {
                .state = &hook_state,
        };
        struct sk_buff *skb = NULL;
        u32 retval, duration;
        void *data;
        int ret;

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

        if (size < sizeof(struct iphdr))
                return -EINVAL;

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

        if (!repeat)
                repeat = 1;

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

        if (user_ctx) {
                ret = verify_and_copy_hook_state(&hook_state, user_ctx, dev);
                if (ret)
                        goto out;
        }

        skb = slab_build_skb(data);
        if (!skb) {
                ret = -ENOMEM;
                goto out;
        }

        data = NULL; /* data released via kfree_skb */

        skb_reserve(skb, NET_SKB_PAD + NET_IP_ALIGN);
        __skb_put(skb, size);

        ret = -EINVAL;

        if (hook_state.hook != NF_INET_LOCAL_OUT) {
                if (size < ETH_HLEN + sizeof(struct iphdr))
                        goto out;

                skb->protocol = eth_type_trans(skb, dev);
                switch (skb->protocol) {
                case htons(ETH_P_IP):
                        if (hook_state.pf == NFPROTO_IPV4)
                                break;
                        goto out;
                case htons(ETH_P_IPV6):
                        if (size < ETH_HLEN + sizeof(struct ipv6hdr))
                                goto out;
                        if (hook_state.pf == NFPROTO_IPV6)
                                break;
                        goto out;
                default:
                        ret = -EPROTO;
                        goto out;
                }

                skb_reset_network_header(skb);
        } else {
                skb->protocol = nfproto_eth(hook_state.pf);
        }

        ctx.skb = skb;

        ret = bpf_test_run(prog, &ctx, repeat, &retval, &duration, false);
        if (ret)
                goto out;

        ret = bpf_test_finish(kattr, uattr, NULL, NULL, 0, 0, retval, duration);

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

static const struct btf_kfunc_id_set bpf_prog_test_kfunc_set = {
        .owner = THIS_MODULE,
        .set   = &test_sk_check_kfunc_ids,
};

BTF_ID_LIST(bpf_prog_test_dtor_kfunc_ids)
BTF_ID(struct, prog_test_ref_kfunc)
BTF_ID(func, bpf_kfunc_call_test_release_dtor)
BTF_ID(struct, prog_test_member)
BTF_ID(func, bpf_kfunc_call_memb_release_dtor)

static int __init bpf_prog_test_run_init(void)
{
        const struct btf_id_dtor_kfunc bpf_prog_test_dtor_kfunc[] = {
                {
                  .btf_id       = bpf_prog_test_dtor_kfunc_ids[0],
                  .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[1]
                },
                {
                  .btf_id       = bpf_prog_test_dtor_kfunc_ids[2],
                  .kfunc_btf_id = bpf_prog_test_dtor_kfunc_ids[3],
                },
        };
        int ret;

        ret = register_btf_fmodret_id_set(&bpf_test_modify_return_set);
        ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SCHED_CLS, &bpf_prog_test_kfunc_set);
        ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_TRACING, &bpf_prog_test_kfunc_set);
        ret = ret ?: register_btf_kfunc_id_set(BPF_PROG_TYPE_SYSCALL, &bpf_prog_test_kfunc_set);
        return ret ?: register_btf_id_dtor_kfuncs(bpf_prog_test_dtor_kfunc,
                                                  ARRAY_SIZE(bpf_prog_test_dtor_kfunc),
                                                  THIS_MODULE);
}
late_initcall(bpf_prog_test_run_init);