selftests/bpf: Remove the bpf_tcp_helpers.h usages from other non tcp-cc tests

The patch removes the remaining bpf_tcp_helpers.h usages in the
non tcp-cc networking tests. It either replaces it with bpf_tracing_net.h
or just removed it because the test is not actually using any
kernel sockets. For the later, the missing macro (mainly SOL_TCP) is
defined locally.

An exception is the test_sock_fields which is testing
the "struct bpf_sock" type instead of the kernel sock type.
Whenever "vmlinux.h" is used instead, it hits a verifier
error on doing arithmetic on the sock_common pointer:

; return !a6[0] && !a6[1] && !a6[2] && a6[3] == bpf_htonl(1); @ test_sock_fields.c:54
21: (61) r2 = *(u32 *)(r1 +28)        ; R1_w=sock_common() R2_w=scalar(smin=0,smax=umax=0xffffffff,var_off=(0x0; 0xffffffff))
22: (56) if w2 != 0x0 goto pc-6       ; R2_w=0
23: (b7) r3 = 28                      ; R3_w=28
24: (bf) r2 = r1                      ; R1_w=sock_common() R2_w=sock_common()
25: (0f) r2 += r3
R2 pointer arithmetic on sock_common prohibited

Hence, instead of including bpf_tracing_net.h, the test_sock_fields test
defines a tcp_sock with one lsndtime field in it.

Another highlight is, in sockopt_qos_to_cc.c, the tcp_cc_eq()
is replaced by bpf_strncmp(). tcp_cc_eq() was a workaround
in bpf_tcp_helpers.h before bpf_strncmp had been added.

The SOL_IPV6 addition to bpf_tracing_net.h is needed by the
test_tcpbpf_kern test.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20240509175026.3423614-10-martin.lau@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 6 insertions, 10 deletions

diff --git a/tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c b/tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c
index 83753b00a556..5c3614333b01 100644
--- a/tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c
+++ b/tools/testing/selftests/bpf/progs/sockopt_qos_to_cc.c
@@ -1,24 +1,20 @@
 // SPDX-License-Identifier: GPL-2.0
 /* Copyright (c) 2021 Facebook */
-#include <string.h>
-#include <linux/tcp.h>
-#include <netinet/in.h>
-#include <linux/bpf.h>
-#include <bpf/bpf_helpers.h>
-#include "bpf_tcp_helpers.h"
+#include "bpf_tracing_net.h"
 
 char _license[] SEC("license") = "GPL";
 
 __s32 page_size = 0;
 
+const char cc_reno[TCP_CA_NAME_MAX] = "reno";
+const char cc_cubic[TCP_CA_NAME_MAX] = "cubic";
+
 SEC("cgroup/setsockopt")
 int sockopt_qos_to_cc(struct bpf_sockopt *ctx)
 {
 	void *optval_end = ctx->optval_end;
 	int *optval = ctx->optval;
 	char buf[TCP_CA_NAME_MAX];
-	char cc_reno[TCP_CA_NAME_MAX] = "reno";
-	char cc_cubic[TCP_CA_NAME_MAX] = "cubic";
 
 	if (ctx->level != SOL_IPV6 || ctx->optname != IPV6_TCLASS)
 		goto out;
@@ -29,11 +25,11 @@ int sockopt_qos_to_cc(struct bpf_sockopt *ctx)
 	if (bpf_getsockopt(ctx->sk, SOL_TCP, TCP_CONGESTION, &buf, sizeof(buf)))
 		return 0;
 
-	if (!tcp_cc_eq(buf, cc_cubic))
+	if (bpf_strncmp(buf, sizeof(buf), cc_cubic))
 		return 0;
 
 	if (*optval == 0x2d) {
-		if (bpf_setsockopt(ctx->sk, SOL_TCP, TCP_CONGESTION, &cc_reno,
+		if (bpf_setsockopt(ctx->sk, SOL_TCP, TCP_CONGESTION, (void *)&cc_reno,
 				sizeof(cc_reno)))
 			return 0;
 	}