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View Code? Open in Web Editor NEWeBPF to achieve TCPIP bypass, TPROXY, etc.
License: Apache License 2.0
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libbpf: Program '"sockops"' contains non-map related relo data pointing to section 5
- bpftool prog load bpf_sockops_v4.o /sys/fs/bpf/bpf_sockops
libbpf: Program '"sockops"' contains non-map related relo data pointing to section 5
What should I do if an error is reported when executing load.sh
BTF load error
hi,
I am trying your code, but encounter an error like below:
+ sudo bpftool prog load bpf_sockops_v4.o /sys/fs/bpf/bpf_sockops
libbpf: Error loading BTF: Invalid argument(22)
libbpf: magic: 0xeb9f
version: 1
flags: 0x0
hdr_len: 24
type_off: 0
type_len: 952
str_off: 952
str_len: 1192
btf_total_size: 2168
[1] PTR (anon) type_id=2
[2] STRUCT bpf_sock_ops size=192 vlen=36
op type_id=3 bits_offset=0
(anon) type_id=5 bits_offset=32
family type_id=3 bits_offset=160
remote_ip4 type_id=3 bits_offset=192
local_ip4 type_id=3 bits_offset=224
remote_ip6 type_id=6 bits_offset=256
local_ip6 type_id=6 bits_offset=384
remote_port type_id=3 bits_offset=512
local_port type_id=3 bits_offset=544
is_fullsock type_id=3 bits_offset=576
snd_cwnd type_id=3 bits_offset=608
srtt_us type_id=3 bits_offset=640
bpf_sock_ops_cb_flags type_id=3 bits_offset=672
state type_id=3 bits_offset=704
rtt_min type_id=3 bits_offset=736
snd_ssthresh type_id=3 bits_offset=768
rcv_nxt type_id=3 bits_offset=800
snd_nxt type_id=3 bits_offset=832
snd_una type_id=3 bits_offset=864
mss_cache type_id=3 bits_offset=896
ecn_flags type_id=3 bits_offset=928
rate_delivered type_id=3 bits_offset=960
rate_interval_us type_id=3 bits_offset=992
packets_out type_id=3 bits_offset=1024
retrans_out type_id=3 bits_offset=1056
total_retrans type_id=3 bits_offset=1088
segs_in type_id=3 bits_offset=1120
data_segs_in type_id=3 bits_offset=1152
segs_out type_id=3 bits_offset=1184
data_segs_out type_id=3 bits_offset=1216
lost_out type_id=3 bits_offset=1248
sacked_out type_id=3 bits_offset=1280
sk_txhash type_id=3 bits_offset=1312
bytes_received type_id=8 bits_offset=1344
bytes_acked type_id=8 bits_offset=1408
(anon) type_id=10 bits_offset=1472
[3] TYPEDEF __u32 type_id=4
[4] INT unsigned int size=4 bits_offset=0 nr_bits=32 encoding=(none)
[5] UNION (anon) size=16 vlen=3
args type_id=6 bits_offset=0
reply type_id=3 bits_offset=0
replylong type_id=6 bits_offset=0
[6] ARRAY (anon) type_id=3 index_type_id=7 nr_elems=4
[7] INT __ARRAY_SIZE_TYPE__ size=4 bits_offset=0 nr_bits=32 encoding=(none)
[8] TYPEDEF __u64 type_id=9
[9] INT long long unsigned int size=8 bits_offset=0 nr_bits=64 encoding=(none)
[10] UNION (anon) size=8 vlen=1
sk type_id=11 bits_offset=0
[11] PTR (anon) type_id=26
[12] FUNC_PROTO (anon) return=13 args=(1 skops)
[13] INT int size=4 bits_offset=0 nr_bits=32 encoding=SIGNED
[14] FUNC bpf_sockops_v4 type_id=12 vlen != 0
libbpf: Error loading .BTF into kernel: -22.
libbpf: bad map relo against section 5
Error: failed to open object file
I have debugged for days, but still don't pass the BTF load, I have checked below conditions, can you help to see where is wrong? Thanks in advance.
[root@centos8-worker3 sockredir]# clang --version
clang version 11.0.0 (https://github.com/llvm/llvm-project.git 176249bd6732a8044d457092ed932768724a6f06)
Target: x86_64-unknown-linux-gnu
Thread model: posix
InstalledDir: /usr/local/bin
[root@centos8-worker3 sockredir]# llc --version
LLVM (http://llvm.org/):
LLVM version 11.0.0
DEBUG build with assertions.
Default target: x86_64-unknown-linux-gnu
Host CPU: cascadelake
[root@centos8-worker3 sockredir]# ip -V
ip utility, iproute2-5.8.0
[root@centos8-worker3 sockredir]# uname -r
4.18.0-193.19.1.el8_2.x86_64
// also tried built a new kernel 5.4.77, same result
the built object's sections is like below:
[root@centos8-worker3 sockredir]# readelf -S bpf_sockops_v4.o
There are 25 section headers, starting at offset 0x3200:
Section Headers:
[Nr] Name Type Address Offset
Size EntSize Flags Link Info Align
[ 0] NULL 0000000000000000 00000000
0000000000000000 0000000000000000 0 0 0
[ 1] .strtab STRTAB 0000000000000000 000030e1
000000000000011f 0000000000000000 0 0 1
[ 2] .text PROGBITS 0000000000000000 00000040
0000000000000000 0000000000000000 AX 0 0 4
[ 3] "sockops" PROGBITS 0000000000000000 00000040
0000000000000268 0000000000000000 AX 0 0 8
[ 4] .rel"sockops" REL 0000000000000000 00002720
0000000000000010 0000000000000010 24 3 8
[ 5] "maps" PROGBITS 0000000000000000 000002a8
0000000000000014 0000000000000000 WA 0 0 4
[ 6] "license" PROGBITS 0000000000000000 000002bc
0000000000000004 0000000000000000 WA 0 0 1
[ 7] "version" PROGBITS 0000000000000000 000002c0
0000000000000004 0000000000000000 WA 0 0 4
[ 8] .rodata.str1.1 PROGBITS 0000000000000000 000002c4
0000000000000044 0000000000000001 AMS 0 0 1
[ 9] .debug_loc PROGBITS 0000000000000000 00000308
00000000000000c2 0000000000000000 0 0 1
[10] .debug_abbrev PROGBITS 0000000000000000 000003ca
00000000000001b4 0000000000000000 0 0 1
[11] .debug_info PROGBITS 0000000000000000 0000057e
0000000000000649 0000000000000000 0 0 1
[12] .rel.debug_info REL 0000000000000000 00002730
00000000000007c0 0000000000000010 24 11 8
[13] .debug_ranges PROGBITS 0000000000000000 00000bc7
0000000000000030 0000000000000000 0 0 1
[14] .debug_str PROGBITS 0000000000000000 00000bf7
0000000000000428 0000000000000001 MS 0 0 1
[15] .BTF PROGBITS 0000000000000000 0000101f
0000000000000878 0000000000000000 0 0 1
[16] .rel.BTF REL 0000000000000000 00002ef0
0000000000000030 0000000000000010 24 15 8
[17] .BTF.ext PROGBITS 0000000000000000 00001897
00000000000001c0 0000000000000000 0 0 1
[18] .rel.BTF.ext REL 0000000000000000 00002f20
0000000000000190 0000000000000010 24 17 8
[19] .debug_frame PROGBITS 0000000000000000 00001a58
0000000000000028 0000000000000000 0 0 8
[20] .rel.debug_frame REL 0000000000000000 000030b0
0000000000000020 0000000000000010 24 19 8
[21] .debug_line PROGBITS 0000000000000000 00001a80
000000000000021a 0000000000000000 0 0 1
[22] .rel.debug_line REL 0000000000000000 000030d0
0000000000000010 0000000000000010 24 21 8
[23] .llvm_addrsig LOOS+0xfff4c03 0000000000000000 000030e0
0000000000000001 0000000000000000 E 24 0 1
[24] .symtab SYMTAB 0000000000000000 00001ca0
0000000000000a80 0000000000000018 1 108 8
Key to Flags:
W (write), A (alloc), X (execute), M (merge), S (strings), I (info),
L (link order), O (extra OS processing required), G (group), T (TLS),
C (compressed), x (unknown), o (OS specific), E (exclude),
p (processor specific)
[FAQ]load bpf script run error log, need guidance
[root@ch7-smc-2407 bpf]# ./load.sh
- set -e
- sudo mount -t bpf bpf /sys/fs/bpf/
- clang -O2 -g -target bpf -c bpf_sockops.c -o bpf_sockops.o
- sudo bpftool prog load bpf_sockops.o /sys/fs/bpf/bpf_sockops
libbpf: elf: skipping unrecognized data section(8) .rodata.str1.1
libbpf: elf: skipping unrecognized data section(18) .eh_frame
libbpf: elf: skipping relo section(19) .rel.eh_frame for section(18) .eh_frame - sudo bpftool cgroup attach /sys/fs/cgroup/unified/ sock_ops pinned /sys/fs/bpf/bpf_sockops
Error: can't open cgroup /sys/fs/cgroup/unified/
[root@ch7-smc-2407 bpf]#
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