1 // SPDX-License-Identifier: GPL-2.0 2 /* Copyright (c) 2020 Facebook */ 3 /* "undefine" structs in vmlinux.h, because we "override" them below */ 4 #define bpf_iter_meta bpf_iter_meta___not_used 5 #define bpf_iter__ipv6_route bpf_iter__ipv6_route___not_used 6 #include "vmlinux.h" 7 #undef bpf_iter_meta 8 #undef bpf_iter__ipv6_route 9 #include <bpf/bpf_helpers.h> 10 #include <bpf/bpf_tracing.h> 11 12 struct bpf_iter_meta { 13 struct seq_file *seq; 14 __u64 session_id; 15 __u64 seq_num; 16 } __attribute__((preserve_access_index)); 17 18 struct bpf_iter__ipv6_route { 19 struct bpf_iter_meta *meta; 20 struct fib6_info *rt; 21 } __attribute__((preserve_access_index)); 22 23 char _license[] SEC("license") = "GPL"; 24 25 extern bool CONFIG_IPV6_SUBTREES __kconfig __weak; 26 27 #define RTF_GATEWAY 0x0002 28 #define IFNAMSIZ 16 29 #define fib_nh_gw_family nh_common.nhc_gw_family 30 #define fib_nh_gw6 nh_common.nhc_gw.ipv6 31 #define fib_nh_dev nh_common.nhc_dev 32 33 SEC("iter/ipv6_route") 34 int dump_ipv6_route(struct bpf_iter__ipv6_route *ctx) 35 { 36 struct seq_file *seq = ctx->meta->seq; 37 struct fib6_info *rt = ctx->rt; 38 const struct net_device *dev; 39 struct fib6_nh *fib6_nh; 40 unsigned int flags; 41 struct nexthop *nh; 42 43 if (rt == (void *)0) 44 return 0; 45 46 fib6_nh = &rt->fib6_nh[0]; 47 flags = rt->fib6_flags; 48 49 /* FIXME: nexthop_is_multipath is not handled here. */ 50 nh = rt->nh; 51 if (rt->nh) 52 fib6_nh = &nh->nh_info->fib6_nh; 53 54 BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_dst.addr, rt->fib6_dst.plen); 55 56 if (CONFIG_IPV6_SUBTREES) 57 BPF_SEQ_PRINTF(seq, "%pi6 %02x ", &rt->fib6_src.addr, 58 rt->fib6_src.plen); 59 else 60 BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 00 "); 61 62 if (fib6_nh->fib_nh_gw_family) { 63 flags |= RTF_GATEWAY; 64 BPF_SEQ_PRINTF(seq, "%pi6 ", &fib6_nh->fib_nh_gw6); 65 } else { 66 BPF_SEQ_PRINTF(seq, "00000000000000000000000000000000 "); 67 } 68 69 dev = fib6_nh->fib_nh_dev; 70 if (dev) 71 BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x %8s\n", rt->fib6_metric, 72 rt->fib6_ref.refs.counter, 0, flags, dev->name); 73 else 74 BPF_SEQ_PRINTF(seq, "%08x %08x %08x %08x\n", rt->fib6_metric, 75 rt->fib6_ref.refs.counter, 0, flags); 76 77 return 0; 78 } 79