// SPDX-License-Identifier: GPL-2.0

#include "vmlinux.h"

#include <bpf/bpf_helpers.h>

#define AF_INET6 10

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

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

struct {
        __uint(type, BPF_MAP_TYPE_SOCKMAP);
        __uint(max_entries, 2);
        __type(key, __u32);
        __type(value, __u64);
} sock_map SEC(".maps");

int tcx_init_netns_cookie, tcx_netns_cookie;
int cgroup_skb_init_netns_cookie, cgroup_skb_netns_cookie;

SEC("sockops")
int get_netns_cookie_sockops(struct bpf_sock_ops *ctx)
{
        struct bpf_sock *sk = ctx->sk;
        int *cookie;
        __u32 key = 0;

        if (ctx->family != AF_INET6)
                return 1;

        if (!sk)
                return 1;

        switch (ctx->op) {
        case BPF_SOCK_OPS_TCP_CONNECT_CB:
                cookie = bpf_sk_storage_get(&sockops_netns_cookies, sk, 0,
                                            BPF_SK_STORAGE_GET_F_CREATE);
                if (!cookie)
                        return 1;

                *cookie = bpf_get_netns_cookie(ctx);
                break;
        case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
                bpf_sock_map_update(ctx, &sock_map, &key, BPF_NOEXIST);
                break;
        default:
                break;
        }

        return 1;
}

SEC("sk_msg")
int get_netns_cookie_sk_msg(struct sk_msg_md *msg)
{
        struct bpf_sock *sk = msg->sk;
        int *cookie;

        if (msg->family != AF_INET6)
                return 1;

        if (!sk)
                return 1;

        cookie = bpf_sk_storage_get(&sk_msg_netns_cookies, sk, 0,
                                    BPF_SK_STORAGE_GET_F_CREATE);
        if (!cookie)
                return 1;

        *cookie = bpf_get_netns_cookie(msg);

        return 1;
}

SEC("tcx/ingress")
int get_netns_cookie_tcx(struct __sk_buff *skb)
{
        tcx_init_netns_cookie = bpf_get_netns_cookie(NULL);
        tcx_netns_cookie = bpf_get_netns_cookie(skb);
        return TCX_PASS;
}

SEC("cgroup_skb/ingress")
int get_netns_cookie_cgroup_skb(struct __sk_buff *skb)
{
        cgroup_skb_init_netns_cookie = bpf_get_netns_cookie(NULL);
        cgroup_skb_netns_cookie = bpf_get_netns_cookie(skb);
        return SK_PASS;
}

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