linux-kernel - Re: [PATCH] selftests/bpf: Fix connect4_prog tcp/socket header type conflict

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Message-ID: <e3d9f936-926c-8cd4-1a21-4c2894bf22b6@iogearbox.net>
Date:   Mon, 29 Aug 2022 17:11:46 +0200
From:   Daniel Borkmann <daniel@...earbox.net>
To:     James Hilliard <james.hilliard1@...il.com>, bpf@...r.kernel.org
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Andrii Nakryiko <andrii@...nel.org>,
        Martin KaFai Lau <martin.lau@...ux.dev>,
        Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...nel.org>,
        Stanislav Fomichev <sdf@...gle.com>,
        Hao Luo <haoluo@...gle.com>, Jiri Olsa <jolsa@...nel.org>,
        Mykola Lysenko <mykolal@...com>, Shuah Khan <shuah@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] selftests/bpf: Fix connect4_prog tcp/socket header type
 conflict

On 8/26/22 7:50 AM, James Hilliard wrote:
[...]
> diff --git a/tools/testing/selftests/bpf/progs/connect4_prog.c b/tools/testing/selftests/bpf/progs/connect4_prog.c
> index b241932911db..0f68b8d756b3 100644
> --- a/tools/testing/selftests/bpf/progs/connect4_prog.c
> +++ b/tools/testing/selftests/bpf/progs/connect4_prog.c
> @@ -7,8 +7,7 @@
>   #include <linux/bpf.h>
>   #include <linux/in.h>
>   #include <linux/in6.h>
> -#include <sys/socket.h>
> -#include <netinet/tcp.h>
> +#include <linux/tcp.h>
>   #include <linux/if.h>
>   #include <errno.h>

Can't we just add:

#include "bpf_tcp_helpers.h"

It does define SOL_TCP already and is used also in other prog tests. I presume this
would avoid the need the change all the below.

> @@ -52,7 +51,7 @@ static __inline int verify_cc(struct bpf_sock_addr *ctx,
>   	char buf[TCP_CA_NAME_MAX];
>   	int i;
>   
> -	if (bpf_getsockopt(ctx, SOL_TCP, TCP_CONGESTION, &buf, sizeof(buf)))
> +	if (bpf_getsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, &buf, sizeof(buf)))
>   		return 1;
>   
>   	for (i = 0; i < TCP_CA_NAME_MAX; i++) {
> @@ -70,12 +69,12 @@ static __inline int set_cc(struct bpf_sock_addr *ctx)
>   	char reno[TCP_CA_NAME_MAX] = "reno";
>   	char cubic[TCP_CA_NAME_MAX] = "cubic";
>   
> -	if (bpf_setsockopt(ctx, SOL_TCP, TCP_CONGESTION, &reno, sizeof(reno)))
> +	if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, &reno, sizeof(reno)))
>   		return 1;
>   	if (verify_cc(ctx, reno))
>   		return 1;
>   
> -	if (bpf_setsockopt(ctx, SOL_TCP, TCP_CONGESTION, &cubic, sizeof(cubic)))
> +	if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_CONGESTION, &cubic, sizeof(cubic)))
>   		return 1;
>   	if (verify_cc(ctx, cubic))
>   		return 1;
> @@ -113,15 +112,15 @@ static __inline int set_keepalive(struct bpf_sock_addr *ctx)
>   	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof(one)))
>   		return 1;
>   	if (ctx->type == SOCK_STREAM) {
> -		if (bpf_setsockopt(ctx, SOL_TCP, TCP_KEEPIDLE, &one, sizeof(one)))
> +		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_KEEPIDLE, &one, sizeof(one)))
>   			return 1;
> -		if (bpf_setsockopt(ctx, SOL_TCP, TCP_KEEPINTVL, &one, sizeof(one)))
> +		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_KEEPINTVL, &one, sizeof(one)))
>   			return 1;
> -		if (bpf_setsockopt(ctx, SOL_TCP, TCP_KEEPCNT, &one, sizeof(one)))
> +		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_KEEPCNT, &one, sizeof(one)))
>   			return 1;
> -		if (bpf_setsockopt(ctx, SOL_TCP, TCP_SYNCNT, &one, sizeof(one)))
> +		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_SYNCNT, &one, sizeof(one)))
>   			return 1;
> -		if (bpf_setsockopt(ctx, SOL_TCP, TCP_USER_TIMEOUT, &one, sizeof(one)))
> +		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_USER_TIMEOUT, &one, sizeof(one)))
>   			return 1;
>   	}
>   	if (bpf_setsockopt(ctx, SOL_SOCKET, SO_KEEPALIVE, &zero, sizeof(zero)))
> @@ -135,7 +134,7 @@ static __inline int set_notsent_lowat(struct bpf_sock_addr *ctx)
>   	int lowat = 65535;
>   
>   	if (ctx->type == SOCK_STREAM) {
> -		if (bpf_setsockopt(ctx, SOL_TCP, TCP_NOTSENT_LOWAT, &lowat, sizeof(lowat)))
> +		if (bpf_setsockopt(ctx, IPPROTO_TCP, TCP_NOTSENT_LOWAT, &lowat, sizeof(lowat)))
>   			return 1;
>   	}
>   
>