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

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Date:   Mon, 29 Aug 2022 09:49:55 -0600
From:   James Hilliard <james.hilliard1@...il.com>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     bpf@...r.kernel.org, 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 Mon, Aug 29, 2022 at 9:11 AM Daniel Borkmann <daniel@...earbox.net> wrote:
>
> 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"

Yeah, that seems to work, changed in v2:
https://lore.kernel.org/bpf/20220829154710.3870139-1-james.hilliard1@gmail.com/

>
> 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;
> >       }
> >
> >
>