netdev - Re: [PATCH net-next 1/3] bpf: Refactor cgroups code in prep for new type

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Date:   Tue, 25 Oct 2016 17:04:41 -0600
From:   David Ahern <dsa@...ulusnetworks.com>
To:     Daniel Borkmann <daniel@...earbox.net>, netdev@...r.kernel.org
Cc:     daniel@...que.org, ast@...com
Subject: Re: [PATCH net-next 1/3] bpf: Refactor cgroups code in prep for new
 type

On 10/25/16 5:01 PM, Daniel Borkmann wrote:
>> diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
>> index a0ab43f264b0..918c01a6f129 100644
>> --- a/kernel/bpf/cgroup.c
>> +++ b/kernel/bpf/cgroup.c
>> @@ -117,6 +117,19 @@ void __cgroup_bpf_update(struct cgroup *cgrp,
>>       }
>>   }
>>
>> +static int __cgroup_bpf_run_filter_skb(struct sk_buff *skb,
>> +                       struct bpf_prog *prog)
>> +{
>> +    unsigned int offset = skb->data - skb_network_header(skb);
>> +    int ret;
>> +
>> +    __skb_push(skb, offset);
>> +    ret = bpf_prog_run_clear_cb(prog, skb) == 1 ? 0 : -EPERM;
> 
> Original code save skb->cb[], this one clears it.
> 

ah, it changed in Daniel's v6 to v7 code and I missed it. Will fix. Thanks for pointing it out.