tools/testing/selftests/bpf/progs/bpf_iter_ipv6_route.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2020 Facebook */
   3 #include <vmlinux.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 }