LXR linux/tools/testing/selftests/bpf/progs/bpf_iter_ipv6

   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#include <bpf/bpf_tracing.h>
   7
   8char _license[] SEC("license") = "GPL";
   9
  10extern bool CONFIG_IPV6_SUBTREES __kconfig __weak;
  11
  12SEC("iter/ipv6_route")
  13int dump_ipv6_route(struct bpf_iter__ipv6_route *ctx)
  14{
  15        struct seq_file *seq = ctx->meta->seq;
  16        struct fib6_info *rt = ctx->rt;
  17        const struct net_device *dev;
  18        struct fib6_nh *fib6_nh;
  19        unsigned int flags;
  20        struct nexthop *nh;
  21
  22        if (rt == (void *)0)
  23                return 0;
  24
  25        fib6_nh = &rt->fib6_nh[0];
  26        flags = rt->fib6_flags;
  27
  28        /* FIXME: nexthop_is_multipath is not handled here. */
  29        nh = rt->nh;
  30        if (rt->nh)
  31                fib6_nh = &nh->nh_info->fib6_nh;
  32
  33        BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen);
  34
  35        if (CONFIG_IPV6_SUBTREES)
  36                BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_src.addr,
  37                               rt->fib6_src.plen);
  38        else
  39                BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 00 ");
  40
  41        if (fib6_nh->fib_nh_gw_family) {
  42                flags |= RTF_GATEWAY;
  43                BPF_SEQ_PRINTF(seq, "%pi6 ", &fib6_nh->fib_nh_gw6);
  44        } else {
  45                BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 ");
  46        }
  47
  48        dev = fib6_nh->fib_nh_dev;
  49        if (dev)
  50                BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x %8s\n", rt->fib6_metric,
  51                               rt->fib6_ref.refs.counter, 0, flags, dev->name);
  52        else
  53                BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x\n", rt->fib6_metric,
  54                               rt->fib6_ref.refs.counter, 0, flags);
  55
  56        return 0;
  57}
  58