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