linux-kernel - Re: [External] Re: [PATCH] bpf: cg

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Message-ID: <b8f8c4a4-b272-454c-b2c7-59417461713b@bytedance.com>
Date: Mon, 19 Aug 2024 12:25:51 +0800
From: Feng Zhou <zhoufeng.zf@...edance.com>
To: Martin KaFai Lau <martin.lau@...ux.dev>
Cc: daniel@...earbox.net, john.fastabend@...il.com, ast@...nel.org,
 andrii@...nel.org, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com,
 netdev@...r.kernel.org, linux-kernel@...r.kernel.org, bpf@...r.kernel.org,
 yangzhenze@...edance.com, wangdongdong.6@...edance.com
Subject: Re: [External] Re: [PATCH] bpf: cg_skb add get classid helper

在 2024/8/16 09:06, Martin KaFai Lau 写道:
> On 8/14/24 2:50 AM, Feng zhou wrote:
>> From: Feng Zhou <zhoufeng.zf@...edance.com>
>>
>> At cg_skb hook point, can get classid for v1 or v2, allowing
>> users to do more functions such as acl.
>>
>> Signed-off-by: Feng Zhou <zhoufeng.zf@...edance.com>
>> ---
>>   net/core/filter.c | 6 ++++++
>>   1 file changed, 6 insertions(+)
>>
>> diff --git a/net/core/filter.c b/net/core/filter.c
>> index 78a6f746ea0b..d69ba589882f 100644
>> --- a/net/core/filter.c
>> +++ b/net/core/filter.c
>> @@ -8111,6 +8111,12 @@ cg_skb_func_proto(enum bpf_func_id func_id, 
>> const struct bpf_prog *prog)
>>           return &bpf_get_listener_sock_proto;
>>       case BPF_FUNC_skb_ecn_set_ce:
>>           return &bpf_skb_ecn_set_ce_proto;
>> +    case BPF_FUNC_get_cgroup_classid:
>> +        return &bpf_get_cgroup_classid_proto;
>> +#endif
>> +#ifdef CONFIG_CGROUP_NET_CLASSID
>> +    case BPF_FUNC_skb_cgroup_classid:
>> +        return &bpf_skb_cgroup_classid_proto;
> 
> With this bpf_skb_cgroup_classid_proto, is the above 
> bpf_get_cgroup_classid_proto necessary?
> The cg_skb hook must have a skb->sk.

Yes, just add bpf_skb_cgroup_classid_proto.

> 
> Please add a selftest and tag the subject with bpf-next.
> 

Will do, thanks.

> pw-bot: cr
> 
>>   #endif
>>       default:
>>           return sk_filter_func_proto(func_id, prog);
>