1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 #include "vmlinux.h" 4 #include <bpf/bpf_helpers.h> 5 #include <bpf/bpf_tracing.h> 6 7 char _license[] SEC("license") = "GPL"; 8 9 extern bool CONFIG_IPV6_SUBTREES __kconfig __weak; 10 11 #define RTF_GATEWAY 0x0002 12 #define IFNAMSIZ 16 13 #define fib_nh_gw_family nh_common.nhc_gw_family 14 #define fib_nh_gw6 nh_common.nhc_gw.ipv6 15 #define fib_nh_dev nh_common.nhc_dev 16 17 SEC("iter/ipv6_route") 18 int dump_ipv6_route(struct bpf_iter__ipv6_route *ctx) 19 { 20 struct seq_file *seq = ctx->meta->seq; 21 struct fib6_info *rt = ctx->rt; 22 const struct net_device *dev; 23 struct fib6_nh *fib6_nh; 24 unsigned int flags; 25 struct nexthop *nh; 26 27 if (rt == (void *)0) 28 return 0; 29 30 fib6_nh = &rt->fib6_nh[0]; 31 flags = rt->fib6_flags; 32 33 /* FIXME: nexthop_is_multipath is not handled here. */ 34 nh = rt->nh; 35 if (rt->nh) 36 fib6_nh = &nh->nh_info->fib6_nh; 37 38 BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen); 39 40 if (CONFIG_IPV6_SUBTREES) 41 BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_src.addr, 42 rt->fib6_src.plen); 43 else 44 BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 00 "); 45 46 if (fib6_nh->fib_nh_gw_family) { 47 flags |= RTF_GATEWAY; 48 BPF_SEQ_PRINTF(seq, "%pi6 ", &fib6_nh->fib_nh_gw6); 49 } else { 50 BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 "); 51 } 52 53 dev = fib6_nh->fib_nh_dev; 54 if (dev) 55 BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x %8s\n", rt->fib6_metric, 56 rt->fib6_ref.refs.counter, 0, flags, dev->name); 57 else 58 BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x\n", rt->fib6_metric, 59 rt->fib6_ref.refs.counter, 0, flags); 60 61 return 0; 62 } 63