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")
dump_ipv6_route(struct bpf_iter__ipv6_route * ctx)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