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 
7 char _license[] SEC("license") = "GPL";
8 
9 extern bool CONFIG_IPV6_SUBTREES __kconfig __weak;
10 
11 SEC("iter/ipv6_route")
12 int 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