// SPDX-License-Identifier: GPL-2.0

#include <vmlinux.h>
#include "bpf_experimental.h"
#include "bpf_qdisc_common.h"
#include "bpf_misc.h"

char _license[] SEC("license") = "GPL";

int proto;

static __noinline int free_skb(struct sk_buff *skb)
{
        bpf_kfree_skb(skb);
        return 0;
}

SEC("struct_ops")
__failure __msg("invalid mem access 'scalar'")
int BPF_PROG(invalid_dynptr_cross_frame, struct sk_buff *skb, struct Qdisc *sch,
             struct bpf_sk_buff_ptr *to_free)
{
        struct bpf_dynptr ptr;
        struct ethhdr *hdr;

        bpf_dynptr_from_skb((struct __sk_buff *)skb, 0, &ptr);

        hdr = bpf_dynptr_slice(&ptr, 0, NULL, sizeof(*hdr));
        if (!hdr)
                return NET_XMIT_DROP;

        free_skb(skb);

        proto = hdr->h_proto;

        return NET_XMIT_DROP;
}

SEC("struct_ops")
__auxiliary
struct sk_buff *BPF_PROG(bpf_qdisc_test_dequeue, struct Qdisc *sch)
{
        return NULL;
}

SEC("struct_ops")
__auxiliary
int BPF_PROG(bpf_qdisc_test_init, struct Qdisc *sch, struct nlattr *opt,
             struct netlink_ext_ack *extack)
{
        return 0;
}

SEC("struct_ops")
__auxiliary
void BPF_PROG(bpf_qdisc_test_reset, struct Qdisc *sch)
{
}

SEC("struct_ops")
__auxiliary
void BPF_PROG(bpf_qdisc_test_destroy, struct Qdisc *sch)
{
}

SEC(".struct_ops")
struct Qdisc_ops test = {
        .enqueue   = (void *)invalid_dynptr_cross_frame,
        .dequeue   = (void *)bpf_qdisc_test_dequeue,
        .init      = (void *)bpf_qdisc_test_init,
        .reset     = (void *)bpf_qdisc_test_reset,
        .destroy   = (void *)bpf_qdisc_test_destroy,
        .id        = "bpf_qdisc_test",
};