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samples/bpf: Fix MAC address swapping in xdp2_kern

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xdp2_kern rewrites and forwards packets out on the same interface.
Forwarding still works but rewrite got broken when xdp multibuffer
support has been added.

With xdp multibuffer a local copy of the packet has been introduced. The
MAC address is now swapped in the local copy, but the local copy in not
written back.

Fix MAC address swapping be adding write back of modified packet.

Fixes: 7722517422 ("samples/bpf: fixup some tools to be able to support xdp multibuffer")
Signed-off-by: Gerhard Engleder <gerhard@engleder-embedded.com>
Reviewed-by: Andy Gospodarek <gospo@broadcom.com>
Link: https://lore.kernel.org/r/20221015213050.65222-1-gerhard@engleder-embedded.com
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
This commit is contained in:
Gerhard Engleder 2022-10-15 23:30:50 +02:00 committed by Martin KaFai Lau
parent 05ee658c65
commit 7a698edf95
1 changed files with 4 additions and 0 deletions
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4
samples/bpf/xdp2_kern.c
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@ -112,6 +112,10 @@ int xdp_prog1(struct xdp_md *ctx)
if (ipproto == IPPROTO_UDP) {
swap_src_dst_mac(data);
if (bpf_xdp_store_bytes(ctx, 0, pkt, sizeof(pkt)))
return rc;
rc = XDP_TX;
}