netdev - Re: [PATCH iproute2 -next] tc: built-in eBPF exec proxy

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Date:	Thu, 16 Apr 2015 19:59:45 +0200
From:	Daniel Borkmann <daniel@...earbox.net>
To:	Alexei Starovoitov <ast@...mgrid.com>, stephen@...workplumber.org
CC:	hannes@...essinduktion.org, netdev@...r.kernel.org
Subject: Re: [PATCH iproute2 -next] tc: built-in eBPF exec proxy

On 04/16/2015 07:48 PM, Alexei Starovoitov wrote:
> On 4/15/15 7:52 AM, Daniel Borkmann wrote:
>>
>> File descriptors, based on their id, are being fetched from the same
>> unix domain socket as demonstrated in the bpf_agent, the shell spawned
>> via execvpe(2) and the map fds passed over the environment, and thus
>> are made available to applications in the fashion of std{in,out,err}
>> for read/write access, for example in case of iproute2's examples/bpf/:
>
> Amazing that it worked.
> Acked-by: Alexei Starovoitov <ast@...mgrid.com>
>
>> +static void bpf_map_set_env(int *tfd)
>> +{
>> +    char key[64], *val;
>> +    int i;
>> +    for (i = 0; i < BPF_MAP_ID_MAX; i++) {
>> +        memset(key, 0, sizeof(key));
>> +        snprintf(key, sizeof(key), "BPF_MAP%d", i);
>>
>> +        val = secure_getenv(key);
>> +        assert(val != NULL);
>
> everything looks good. My only nit is that the name of the function
> reads as this function is setting env vars, whereas it's actually
> reading them. I guess in your mind it fits with the rest of
> 'bpf_map_set_*' functions, but the name is still confusing.

Ok, since it's example code, I'll find a better function name for it,
keep yours and Hannes' tags and resubmit. Thanks!
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