offload - ignore ethernet packets not destined for us
Test: atest, TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: Icabd1db48a1189425a941384d534c0f18bf20827
diff --git a/Tethering/bpf_progs/offload.c b/Tethering/bpf_progs/offload.c
index ff717c6..e514ef1 100644
--- a/Tethering/bpf_progs/offload.c
+++ b/Tethering/bpf_progs/offload.c
@@ -50,6 +50,9 @@
struct ethhdr* eth = is_ethernet ? data : NULL; // used iff is_ethernet
struct ipv6hdr* ip6 = is_ethernet ? (void*)(eth + 1) : data;
+ // Require ethernet dst mac address to be our unicast address.
+ if (is_ethernet && (skb->pkt_type != PACKET_HOST)) return TC_ACT_OK;
+
// Must be meta-ethernet IPv6 frame
if (skb->protocol != htons(ETH_P_IPV6)) return TC_ACT_OK;