netdev - Re: [PATCH net-next v6 6/6] samples/bpf: add userspace example for prohibiting sockets

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Date:   Thu, 1 Dec 2016 08:13:52 -0700
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     netdev@...r.kernel.org, daniel@...que.org, ast@...com,
        daniel@...earbox.net, maheshb@...gle.com, tgraf@...g.ch
Subject: Re: [PATCH net-next v6 6/6] samples/bpf: add userspace example for
 prohibiting sockets

On 11/30/16 10:59 PM, Alexei Starovoitov wrote:
> On Wed, Nov 30, 2016 at 10:16:50AM -0800, David Ahern wrote:
>> Add examples preventing a process in a cgroup from opening a socket
>> based family, protocol and type.
>>
>> Signed-off-by: David Ahern <dsa@...ulusnetworks.com>
> ...
>> +++ b/samples/bpf/sock_flags_kern.c
>> @@ -0,0 +1,37 @@
>> +#include <uapi/linux/bpf.h>
>> +#include <linux/socket.h>
>> +#include "bpf_helpers.h"
>> +
>> +SEC("cgroup/sock1")
>> +int bpf_prog1(struct bpf_sock *sk)
>> +{
>> +	char fmt[] = "socket: family %d type %d protocol %d\n";
>> +
>> +	bpf_trace_printk(fmt, sizeof(fmt), sk->family, sk->type, sk->protocol);
>> +
>> +	/* block PF_INET6, SOCK_RAW, IPPROTO_ICMPV6 sockets
>> +	 * ie., make ping6 fail
>> +	 */
>> +	if (sk->family == PF_INET6 && sk->type == 3 && sk->protocol == 58)
>> +		return 0;
> 
> why not to use SOCK_RAW and IPPROTO_ICMPV6 instead of constants?

header file hell.