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

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

extern bool CONFIG_IPV6_SUBTREES __kconfig __weak;

SEC("iter/ipv6_route")
int dump_ipv6_route(struct bpf_iter__ipv6_route *ctx)
{
        struct seq_file *seq = ctx->meta->seq;
        struct fib6_info *rt = ctx->rt;
        const struct net_device *dev;
        struct fib6_nh *fib6_nh;
        unsigned int flags;
        struct nexthop *nh;

        if (rt == (void *)0)
                return 0;

        fib6_nh = &rt->fib6_nh[0];
        flags = rt->fib6_flags;

        /* FIXME: nexthop_is_multipath is not handled here. */
        nh = rt->nh;
        if (rt->nh)
                fib6_nh = &nh->nh_info->fib6_nh;

        BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);

        if (CONFIG_IPV6_SUBTREES)
                BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_src.addr,
                               rt->fib6_src.plen);
        else
                BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 00 ");

        if (fib6_nh->fib_nh_gw_family) {
                flags |= RTF_GATEWAY;
                BPF_SEQ_PRINTF(seq, "%pi6 ", &fib6_nh->fib_nh_gw6);
        } else {
                BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 ");
        }

        dev = fib6_nh->fib_nh_dev;
        if (dev)
                BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x %8s\n", rt->fib6_metric,
                               rt->fib6_ref.refs.counter, 0, flags, dev->name);
        else
                BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x\n", rt->fib6_metric,
                               rt->fib6_ref.refs.counter, 0, flags);

        return 0;
}