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| author |   Petar Penkov <ppenkov@google.com> | 2018-12-02 20:18:19 -0500 |
|---|---|---|
| committer |   Daniel Borkmann <daniel@iogearbox.net> | 2018-12-03 21:37:51 +0100 |
| commit | e3da08d057002f9d0831949d51666c3e15dc6b29 (patch) | |
| tree | 1e7a9ef1d6ad44355a50a26ef15a159fd807c72b /include/uapi/linux/bpf.h | |
| parent | libbpf: Fix license in README.rst (diff) | |
| download | linux-dev-e3da08d057002f9d0831949d51666c3e15dc6b29.tar.xz linux-dev-e3da08d057002f9d0831949d51666c3e15dc6b29.zip | |
bpf: allow BPF read access to qdisc pkt_len
The pkt_len field in qdisc_skb_cb stores the skb length as it will
appear on the wire after segmentation. For byte accounting, this value
is more accurate than skb->len. It is computed on entry to the TC
layer, so only valid there.
Allow read access to this field from BPF tc classifier and action
programs. The implementation is analogous to tc_classid, aside from
restricting to read access.
To distinguish it from skb->len and self-describe export as wire_len.
Changes v1->v2
- Rename pkt_len to wire_len
Signed-off-by: Petar Penkov <ppenkov@google.com>
Signed-off-by: Vlad Dumitrescu <vladum@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Diffstat (limited to 'include/uapi/linux/bpf.h')
| -rw-r--r-- | include/uapi/linux/bpf.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/uapi/linux/bpf.h b/include/uapi/linux/bpf.h index 8050caea7495..0183b8e70a9e 100644 --- a/include/uapi/linux/bpf.h +++ b/include/uapi/linux/bpf.h @@ -2497,6 +2497,7 @@ struct __sk_buff { __u32 data_meta; struct bpf_flow_keys *flow_keys; __u64 tstamp; + __u32 wire_len; }; struct bpf_tunnel_key { |