From: Lorenzo Bianconi <lorenzo@kernel.org>
Date: Fri, 21 Jan 2022 11:10:06 +0100
Subject: xdp: disable XDP_REDIRECT for xdp frags
Patch-mainline: v5.18-rc1
Git-commit: ab0db46396ca7a29cb3b5fc206abb5ffa63ad617
References: jsc#PED-1377
XDP_REDIRECT is not fully supported yet for xdp frags 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 <toke@redhat.com>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Link: https://lore.kernel.org/r/0da25e117d0e2673f5d0ce6503393c55c6fb1be9.1642758637.git.lorenzo@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
---
net/core/filter.c | 8 ++++++++
1 file changed, 8 insertions(+)
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -4286,6 +4286,14 @@ int xdp_do_redirect(struct net_device *d
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 frags since
+ * not all XDP capable drivers can map non-linear xdp_frame in
+ * ndo_xdp_xmit.
+ */
+ if (unlikely(xdp_buff_has_frags(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);