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 8 char _license[] SEC("license") = "GPL"; 9 10 extern bool CONFIG_IPV6_SUBTREES __kconfig __weak; 11 12 SEC("iter/ipv6_route") 13 int 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