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bpf: expose prog id for cls_bpf and act_bpf

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In order to be able to retrieve the attached programs from cls_bpf
and act_bpf, we need to expose the prog ids via netlink so that
an application can later on get an fd based on the id through the
BPF_PROG_GET_FD_BY_ID command, and dump related prog info via
BPF_OBJ_GET_INFO_BY_FD command for bpf(2).

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2017-06-21 20:16:11 +02:00 committed by David S. Miller
parent 34cfb542b5
commit e86283071f
4 changed files with 8 additions and 0 deletions
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1
include/uapi/linux/pkt_cls.h
View File

@ -369,6 +369,7 @@ enum {
TCA_BPF_FLAGS,
TCA_BPF_FLAGS_GEN,
TCA_BPF_TAG,
TCA_BPF_ID,
__TCA_BPF_MAX,
};

1
include/uapi/linux/tc_act/tc_bpf.h
View File

@ -28,6 +28,7 @@ enum {
TCA_ACT_BPF_NAME,
TCA_ACT_BPF_PAD,
TCA_ACT_BPF_TAG,
TCA_ACT_BPF_ID,
__TCA_ACT_BPF_MAX,
};
#define TCA_ACT_BPF_MAX (__TCA_ACT_BPF_MAX - 1)

3
net/sched/act_bpf.c
View File

@ -123,6 +123,9 @@ static int tcf_bpf_dump_ebpf_info(const struct tcf_bpf *prog,
nla_put_string(skb, TCA_ACT_BPF_NAME, prog->bpf_name))
return -EMSGSIZE;
if (nla_put_u32(skb, TCA_ACT_BPF_ID, prog->filter->aux->id))
return -EMSGSIZE;
nla = nla_reserve(skb, TCA_ACT_BPF_TAG, sizeof(prog->filter->tag));
if (nla == NULL)
return -EMSGSIZE;

3
net/sched/cls_bpf.c
View File

@ -566,6 +566,9 @@ static int cls_bpf_dump_ebpf_info(const struct cls_bpf_prog *prog,
nla_put_string(skb, TCA_BPF_NAME, prog->bpf_name))
return -EMSGSIZE;
if (nla_put_u32(skb, TCA_BPF_ID, prog->filter->aux->id))
return -EMSGSIZE;
nla = nla_reserve(skb, TCA_BPF_TAG, sizeof(prog->filter->tag));
if (nla == NULL)
return -EMSGSIZE;