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

"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: 1d436885b23b ("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>

diff --git a/tools/testing/selftests/bpf/test_sock.c b/tools/testing/selftests/bpf/test_sock.c
index fb679ac3d4b07a4a68822369f9476ab0d06f7fd2..0e6652733462377cfe7bdc0fa57b5548c39f2e0f 100644 (file)
--- a/tools/testing/selftests/bpf/test_sock.c
+++ b/tools/testing/selftests/bpf/test_sock.c
@@ -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),