[PATCH v21 bpf-next 23/23] xdp: disable XDP_REDIRECT for xdp multi-buff
From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: 2022-01-08 11:55:33
Also in:
bpf
Subsystem:
bpf [general] (safe dynamic programs and tools), bpf [networking] (tcx & tc bpf, sock_addr), networking [general], the rest · Maintainers:
Alexei Starovoitov, Daniel Borkmann, Andrii Nakryiko, Eduard Zingerman, Kumar Kartikeya Dwivedi, "David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Linus Torvalds
XDP_REDIRECT is not fully supported yet for xdp multi-buff since not all XDP capable drivers can map non-linear xdp_frame in ndo_xdp_xmit so disable it for the moment. Acked-by: Toke Hoiland-Jorgensen <redacted> Acked-by: John Fastabend <john.fastabend@gmail.com> Acked-by: Jesper Dangaard Brouer <redacted> Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org> --- net/core/filter.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/net/core/filter.c b/net/core/filter.c
index 2249377b3b1f..e6f6abb54af1 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c@@ -4266,6 +4266,13 @@ int xdp_do_redirect(struct net_device *dev, struct xdp_buff *xdp, struct bpf_redirect_info *ri = this_cpu_ptr(&bpf_redirect_info); enum bpf_map_type map_type = ri->map_type; + /* XDP_REDIRECT is not fully supported yet for xdp multi-buff since + * not all XDP capable drivers can map non-linear xdp_frame in + * ndo_xdp_xmit. + */ + if (unlikely(xdp_buff_is_mb(xdp) && map_type != BPF_MAP_TYPE_CPUMAP)) + return -EOPNOTSUPP; + if (map_type == BPF_MAP_TYPE_XSKMAP) return __xdp_do_redirect_xsk(ri, dev, xdp, xdp_prog);
--
2.33.1