bpf tethering offload - add src subnet to upstream ipv6 direction
This patch is based on aosp/2535559 from maze@.
Add source prefix into the upstream key such that only packets which
source IPv6 address matches it will be forwarded to the upstream
interface.
In this patch, the source prefix is set to zero so there is no
behavior changes. Next CL in patch series will use the real source
prefixes retrieved from upstream interface.
Test: atest TetheringTests
Bug: 261923493
Change-Id: I43d068a29b937c7dfeb6fab632a8effb47ee2263
diff --git a/bpf_progs/offload.h b/bpf_progs/offload.h
index 9dae6c9..1e28f01 100644
--- a/bpf_progs/offload.h
+++ b/bpf_progs/offload.h
@@ -135,10 +135,10 @@
typedef struct {
uint32_t iif; // The input interface index
uint8_t dstMac[ETH_ALEN]; // destination ethernet mac address (zeroed iff rawip ingress)
- uint8_t zero[2]; // zero pad for 8 byte alignment
- // TODO: extend this to include src ip /64 subnet
+ uint8_t zero[6]; // zero pad for 8 byte alignment
+ uint64_t src64; // Top 64-bits of the src ip
} TetherUpstream6Key;
-STRUCT_SIZE(TetherUpstream6Key, 12);
+STRUCT_SIZE(TetherUpstream6Key, 4 + 6 + 6 + 8); // 24
typedef struct {
uint32_t iif; // The input interface index