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| author | Martin KaFai Lau <kafai@fb.com> | 2016-12-07 15:53:11 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-12-08 14:25:13 -0500 |
| commit | 17bedab2723145d17b14084430743549e6943d03 (patch) | |
| tree | 6a1517e36c1be543f591b5ff7fcd7e816dcc906a /kernel/bpf/syscall.c | |
| parent | 8a03cf2cb7efe269913db079afb8c31f20bf0bef (diff) | |
| download | blackbird-op-linux-17bedab2723145d17b14084430743549e6943d03.tar.gz blackbird-op-linux-17bedab2723145d17b14084430743549e6943d03.zip | |
bpf: xdp: Allow head adjustment in XDP prog
This patch allows XDP prog to extend/remove the packet
data at the head (like adding or removing header). It is
done by adding a new XDP helper bpf_xdp_adjust_head().
It also renames bpf_helper_changes_skb_data() to
bpf_helper_changes_pkt_data() to better reflect
that XDP prog does not work on skb.
This patch adds one "xdp_adjust_head" bit to bpf_prog for the
XDP-capable driver to check if the XDP prog requires
bpf_xdp_adjust_head() support. The driver can then decide
to error out during XDP_SETUP_PROG.
Signed-off-by: Martin KaFai Lau <kafai@fb.com>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'kernel/bpf/syscall.c')
| -rw-r--r-- | kernel/bpf/syscall.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 88f609f1c0c3..4819ec9d95f6 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -579,6 +579,8 @@ static void fixup_bpf_calls(struct bpf_prog *prog) prog->dst_needed = 1; if (insn->imm == BPF_FUNC_get_prandom_u32) bpf_user_rnd_init_once(); + if (insn->imm == BPF_FUNC_xdp_adjust_head) + prog->xdp_adjust_head = 1; if (insn->imm == BPF_FUNC_tail_call) { /* mark bpf_tail_call as different opcode * to avoid conditional branch in |
