netdev - Re: [PATCH] iptables: open eBPF programs in read only mode

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Date:   Thu, 26 Mar 2020 07:13:33 -0700
From:   Maciej Żenczykowski <zenczykowski@...il.com>
To:     Pablo Neira Ayuso <pablo@...filter.org>
Cc:     Florian Westphal <fw@...len.de>,
        Linux Network Development Mailing List 
        <netdev@...r.kernel.org>,
        Netfilter Development Mailinglist 
        <netfilter-devel@...r.kernel.org>, Chenbo Feng <fengc@...gle.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH] iptables: open eBPF programs in read only mode

I think your build system's kernel headers are old.

Linux 4.15-rc1 commit 6e71b04a82248ccf13a94b85cbc674a9fefe53f5
Author: Chenbo Feng <fengc@...gle.com>
Date:   Wed Oct 18 13:00:22 2017 -0700

    bpf: Add file mode configuration into bpf maps
--- a/include/uapi/linux/bpf.h
+++ b/include/uapi/linux/bpf.h
@@ -218,6 +218,10 @@ enum bpf_attach_type {

 #define BPF_OBJ_NAME_LEN 16U

+/* Flags for accessing BPF object */
+#define BPF_F_RDONLY           (1U << 3)
+#define BPF_F_WRONLY           (1U << 4)
+
 union bpf_attr {
        struct { /* anonymous struct used by BPF_MAP_CREATE command */
                __u32   map_type;       /* one of enum bpf_map_type */
@@ -260,6 +264,7 @@ union bpf_attr {
        struct { /* anonymous struct used by BPF_OBJ_* commands */
                __aligned_u64   pathname;
                __u32           bpf_fd;
+               __u32           file_flags;
        };

        struct { /* anonymous struct used by BPF_PROG_ATTACH/DETACH commands */

On Thu, Mar 26, 2020 at 7:08 AM Maciej Żenczykowski
<zenczykowski@...il.com> wrote:
>
> I don't get it.  It builds for me.
>
> And it doesn't if I insert an intentional syntax error in the same line,
> so I'm definitely compiling exactly that code.