Add BPF_LOAD_SKB_PKTTYPE macro to BpfClassic.h
Useful for something like:
BPF_LOAD_SKB_PKTTYPE
BPF2_REJECT_IF_NOT_EQUAL(PACKET_OUTGOING)
Test: TreeHugger
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I7d3851830a3a764452a448a8663b8a140f69c9ff
diff --git a/bpf/headers/include/bpf/BpfClassic.h b/bpf/headers/include/bpf/BpfClassic.h
index 924f7a3..e6cef89 100644
--- a/bpf/headers/include/bpf/BpfClassic.h
+++ b/bpf/headers/include/bpf/BpfClassic.h
@@ -63,6 +63,10 @@
#define BPF_LOAD_SKB_PROTOCOL \
BPF_STMT(BPF_LD | BPF_H | BPF_ABS, (__u32)SKF_AD_OFF + SKF_AD_PROTOCOL)
+// loads skb->pkt_type (0..7: see uapi/linux/if_packet.h PACKET_* constants)
+#define BPF_LOAD_SKB_PKTTYPE \
+ BPF_STMT(BPF_LD | BPF_B | BPF_ABS, (__u32)SKF_AD_OFF + SKF_AD_PKTTYPE)
+
// 8-bit load relative to start of link layer (mac/ethernet) header.
#define BPF_LOAD_MAC_RELATIVE_U8(ofs) \
BPF_STMT(BPF_LD | BPF_B | BPF_ABS, (__u32)SKF_LL_OFF + (ofs))