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selftests/bpf: fix "bind{4, 6} deny specific IP & port" on s390

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"bind4 allow specific IP & port" and "bind6 deny specific IP & port"
fail on s390 because of endianness issue: the 4 IP address bytes are
loaded as a word and compared with a constant, but the value of this
constant should be different on big- and little- endian machines, which
is not the case right now.

Use __bpf_constant_ntohl to generate proper value based on machine
endianness.

Fixes: 1d436885b2 ("selftests/bpf: Selftest for sys_bind post-hooks.")
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
This commit is contained in:
Ilya Leoshkevich 2019-08-14 12:41:09 +02:00 committed by Daniel Borkmann
parent 91b4db5313
commit 27df5c7068
1 changed files with 5 additions and 2 deletions
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7
tools/testing/selftests/bpf/test_sock.c
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@ -13,6 +13,7 @@
#include <bpf/bpf.h>
#include "cgroup_helpers.h"
#include "bpf_endian.h"
#include "bpf_rlimit.h"
#include "bpf_util.h"
@ -232,7 +233,8 @@ static struct sock_test tests[] = {
/* if (ip == expected && port == expected) */
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
offsetof(struct bpf_sock, src_ip6[3])),
BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0x01000000, 4),
BPF_JMP_IMM(BPF_JNE, BPF_REG_7,
__bpf_constant_ntohl(0x00000001), 4),
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
offsetof(struct bpf_sock, src_port)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0x2001, 2),
@ -261,7 +263,8 @@ static struct sock_test tests[] = {
/* if (ip == expected && port == expected) */
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
offsetof(struct bpf_sock, src_ip4)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0x0100007F, 4),
BPF_JMP_IMM(BPF_JNE, BPF_REG_7,
__bpf_constant_ntohl(0x7F000001), 4),
BPF_LDX_MEM(BPF_W, BPF_REG_7, BPF_REG_6,
offsetof(struct bpf_sock, src_port)),
BPF_JMP_IMM(BPF_JNE, BPF_REG_7, 0x1002, 2),