linux-kernel - Re: [PATCH net-next v2 3/4] cgroup: bpf: Add bpf_skb_in_cgroup

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Date:	Thu, 23 Jun 2016 09:54:49 -0700
From:	Martin KaFai Lau <kafai@...com>
To:	Daniel Borkmann <daniel@...earbox.net>
CC:	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<netdev@...r.kernel.org>, Alexei Starovoitov <ast@...com>,
	Tejun Heo <tj@...nel.org>, <kernel-team@...com>
Subject: Re: [PATCH net-next v2 3/4] cgroup: bpf: Add bpf_skb_in_cgroup_proto

On Thu, Jun 23, 2016 at 11:53:50AM +0200, Daniel Borkmann wrote:
> >diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
> >index 668e079..68753e0 100644
> >--- a/kernel/bpf/verifier.c
> >+++ b/kernel/bpf/verifier.c
> >@@ -1062,6 +1062,10 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id)
> >  		if (func_id != BPF_FUNC_get_stackid)
> >  			goto error;
> >  		break;
> >+	case BPF_MAP_TYPE_CGROUP_ARRAY:
> >+		if (func_id != BPF_FUNC_skb_in_cgroup)
> >+			goto error;
> >+		break;
>
> I think the BPF_MAP_TYPE_CGROUP_ARRAY case should have been fist here in
> patch 2/4, but with unconditional goto error. And this one only adds the
> 'func_id != BPF_FUNC_skb_in_cgroup' test.
I am not sure I understand.  Can you elaborate? I am probably missing
something here.

>
> >  	default:
> >  		break;
> >  	}
> >@@ -1081,6 +1085,10 @@ static int check_map_func_compatibility(struct bpf_map *map, int func_id)
> >  		if (map->map_type != BPF_MAP_TYPE_STACK_TRACE)
> >  			goto error;
> >  		break;
> >+	case BPF_FUNC_skb_in_cgroup:
> >+		if (map->map_type != BPF_MAP_TYPE_CGROUP_ARRAY)
> >+			goto error;
> >+		break;
> >  	default:
> >  		break;
> >  	}