]> git.baikalelectronics.ru Git - kernel.git/commit
bpf: allow BPF read access to qdisc pkt_len
authorPetar Penkov <ppenkov@google.com>
Mon, 3 Dec 2018 01:18:19 +0000 (20:18 -0500)
committerDaniel Borkmann <daniel@iogearbox.net>
Mon, 3 Dec 2018 20:37:51 +0000 (21:37 +0100)
commit2313756853d7b15e4f0bd5b37d765744bcd4d464
tree1e7a9ef1d6ad44355a50a26ef15a159fd807c72b
parent5b7bccec07a3bf9db12e8dfaf87ba08151f4d4ae
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>
include/uapi/linux/bpf.h
net/core/filter.c
tools/include/uapi/linux/bpf.h
tools/testing/selftests/bpf/test_verifier.c