// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include <vmlinux.h>
#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>

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

struct {
        __uint(type, BPF_MAP_TYPE_SK_STORAGE);
        __uint(map_flags, BPF_F_NO_PREALLOC);
        __type(key, int);
        __type(value, int);
} sk_stg_map SEC(".maps");

__u32 val_sum = 0;
__u32 ipv6_sk_count = 0;
__u32 to_add_val = 0;

SEC("iter/bpf_sk_storage_map")
int rw_bpf_sk_storage_map(struct bpf_iter__bpf_sk_storage_map *ctx)
{
        struct sock *sk = ctx->sk;
        __u32 *val = ctx->value;

        if (sk == NULL || val == NULL)
                return 0;

        if (sk->sk_family == AF_INET6)
                ipv6_sk_count++;

        val_sum += *val;

        *val += to_add_val;

        return 0;
}

SEC("iter/bpf_sk_storage_map")
int oob_write_bpf_sk_storage_map(struct bpf_iter__bpf_sk_storage_map *ctx)
{
        struct sock *sk = ctx->sk;
        __u32 *val = ctx->value;

        if (sk == NULL || val == NULL)
                return 0;

        *(val + 1) = 0xdeadbeef;

        return 0;
}