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-rw-r--r--samples/bpf/xdp_redirect_cpu_kern.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/samples/bpf/xdp_redirect_cpu_kern.c b/samples/bpf/xdp_redirect_cpu_kern.c
index 303e9e7161f3..8cb703671b04 100644
--- a/samples/bpf/xdp_redirect_cpu_kern.c
+++ b/samples/bpf/xdp_redirect_cpu_kern.c
@@ -134,7 +134,16 @@ bool parse_eth(struct ethhdr *eth, void *data_end,
return false;
eth_type = vlan_hdr->h_vlan_encapsulated_proto;
}
- /* TODO: Handle double VLAN tagged packet */
+ /* Handle double VLAN tagged packet */
+ if (eth_type == htons(ETH_P_8021Q) || eth_type == htons(ETH_P_8021AD)) {
+ struct vlan_hdr *vlan_hdr;
+
+ vlan_hdr = (void *)eth + offset;
+ offset += sizeof(*vlan_hdr);
+ if ((void *)eth + offset > data_end)
+ return false;
+ eth_type = vlan_hdr->h_vlan_encapsulated_proto;
+ }
*eth_proto = ntohs(eth_type);
*l3_offset = offset;