From: "Asbjørn Sloth Tønnesen" <ast@fiberby.net>
To: bpf@vger.kernel.org
Cc: "Asbjørn Sloth Tønnesen" <ast@fiberby.net>,
"Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Song Liu" <song@kernel.org>,
"Yonghong Song" <yonghong.song@linux.dev>,
"John Fastabend" <john.fastabend@gmail.com>,
"KP Singh" <kpsingh@kernel.org>,
"Stanislav Fomichev" <sdf@fomichev.me>,
"Hao Luo" <haoluo@google.com>, "Jiri Olsa" <jolsa@kernel.org>,
"Mykola Lysenko" <mykolal@fb.com>,
"Shuah Khan" <shuah@kernel.org>,
"Tushar Vyavahare" <tushar.vyavahare@intel.com>,
"Magnus Karlsson" <magnus.karlsson@intel.com>,
"Willem de Bruijn" <willemb@google.com>,
netdev@vger.kernel.org, linux-kselftest@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH bpf-next] selftests/bpf: Avoid subtraction after htons() in ipip tests
Date: Thu, 8 Aug 2024 07:59:02 +0000 [thread overview]
Message-ID: <20240808075906.1849564-1-ast@fiberby.net> (raw)
On little-endian systems, doing subtraction after htons()
leads to interesting results:
Given:
MAGIC_BYTES = 123 = 0x007B aka. in big endian: 0x7B00 = 31488
sizeof(struct iphdr) = 20
Before this patch:
__bpf_constant_htons(MAGIC_BYTES) - sizeof(struct iphdr) = 0x7AEC
0x7AEC = htons(0xEC7A) = htons(60538)
So these were outer IP packets with a total length of 123 bytes,
containing an inner IP packet with a total length of 60538 bytes.
After this patch:
__bpf_constant_htons(MAGIC_BYTES - sizeof(struct iphdr)) = htons(103)
Now these packets are outer IP packets with a total length of 123 bytes,
containing an inner IP packet with a total length of 103 bytes.
Signed-off-by: Asbjørn Sloth Tønnesen <ast@fiberby.net>
---
I didn't target bpf and add a Fixes: e853ae776a58 ("selftests/bpf:
support BPF_FLOW_DISSECTOR_F_STOP_AT_ENCAP"), since it only breaks
when I change the BPF flow dissector to interact with tot_len.
.../selftests/bpf/prog_tests/flow_dissector.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
index 9e5f38739104..6b3078dd5645 100644
--- a/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
+++ b/tools/testing/selftests/bpf/prog_tests/flow_dissector.c
@@ -378,8 +378,8 @@ struct test tests[] = {
.iph_inner.ihl = 5,
.iph_inner.protocol = IPPROTO_TCP,
.iph_inner.tot_len =
- __bpf_constant_htons(MAGIC_BYTES) -
- sizeof(struct iphdr),
+ __bpf_constant_htons(MAGIC_BYTES -
+ sizeof(struct iphdr)),
.tcp.doff = 5,
.tcp.source = 80,
.tcp.dest = 8080,
@@ -407,8 +407,8 @@ struct test tests[] = {
.iph_inner.ihl = 5,
.iph_inner.protocol = IPPROTO_TCP,
.iph_inner.tot_len =
- __bpf_constant_htons(MAGIC_BYTES) -
- sizeof(struct iphdr),
+ __bpf_constant_htons(MAGIC_BYTES -
+ sizeof(struct iphdr)),
.tcp.doff = 5,
.tcp.source = 80,
.tcp.dest = 8080,
@@ -436,8 +436,8 @@ struct test tests[] = {
.iph_inner.ihl = 5,
.iph_inner.protocol = IPPROTO_TCP,
.iph_inner.tot_len =
- __bpf_constant_htons(MAGIC_BYTES) -
- sizeof(struct iphdr),
+ __bpf_constant_htons(MAGIC_BYTES -
+ sizeof(struct iphdr)),
.tcp.doff = 5,
.tcp.source = 99,
.tcp.dest = 9090,
--
2.45.2
next reply other threads:[~2024-08-08 8:01 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-08-08 7:59 Asbjørn Sloth Tønnesen [this message]
2024-08-08 9:24 ` [PATCH bpf-next] selftests/bpf: Avoid subtraction after htons() in ipip tests Toke Høiland-Jørgensen
2024-08-14 1:15 ` Martin KaFai Lau
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