1// SPDX-License-Identifier: GPL-2.0
2/* Copyright (c) 2020 Facebook */
3#include "bpf_iter.h"
4#include "bpf_tracing_net.h"
5#include <bpf/bpf_helpers.h>
6
7char _license[] SEC("license") = "GPL";
8
9extern bool CONFIG_IPV6_SUBTREES __kconfig __weak;
10
11SEC("iter/ipv6_route")
12int dump_ipv6_route(struct bpf_iter__ipv6_route *ctx)
13{
14	struct seq_file *seq = ctx->meta->seq;
15	struct fib6_info *rt = ctx->rt;
16	const struct net_device *dev;
17	struct fib6_nh *fib6_nh;
18	unsigned int flags;
19	struct nexthop *nh;
20
21	if (rt == (void *)0)
22		return 0;
23
24	fib6_nh = &rt->fib6_nh[0];
25	flags = rt->fib6_flags;
26
27	/* FIXME: nexthop_is_multipath is not handled here. */
28	nh = rt->nh;
29	if (rt->nh)
30		fib6_nh = &nh->nh_info->fib6_nh;
31
32	BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);
33
34	if (CONFIG_IPV6_SUBTREES)
35		BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_src.addr,
36			       rt->fib6_src.plen);
37	else
38		BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 00 ");
39
40	if (fib6_nh->fib_nh_gw_family) {
41		flags |= RTF_GATEWAY;
42		BPF_SEQ_PRINTF(seq, "%pi6 ", &fib6_nh->fib_nh_gw6);
43	} else {
44		BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 ");
45	}
46
47	dev = fib6_nh->fib_nh_dev;
48	if (dev)
49		BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x %8s\n", rt->fib6_metric,
50			       rt->fib6_ref.refs.counter, 0, flags, dev->name);
51	else
52		BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x\n", rt->fib6_metric,
53			       rt->fib6_ref.refs.counter, 0, flags);
54
55	return 0;
56}
57