[Refactor] Make uid owner match comparison logic into a function
As an inline function, the logic can be reused by others.
Bug: Bug: 288340533
Test: build; presubmit
Change-Id: I8e57829e304e829eed72cc165b051cd22088260d
diff --git a/bpf_progs/netd.h b/bpf_progs/netd.h
index 6e9acaa..dd27bf9 100644
--- a/bpf_progs/netd.h
+++ b/bpf_progs/netd.h
@@ -235,3 +235,17 @@
#define CURRENT_STATS_MAP_CONFIGURATION_KEY 1
#undef STRUCT_SIZE
+
+// DROP_IF_SET is set of rules that DROP if rule is globally enabled, and per-uid bit is set
+#define DROP_IF_SET (STANDBY_MATCH | OEM_DENY_1_MATCH | OEM_DENY_2_MATCH | OEM_DENY_3_MATCH)
+// DROP_IF_UNSET is set of rules that should DROP if globally enabled, and per-uid bit is NOT set
+#define DROP_IF_UNSET (DOZABLE_MATCH | POWERSAVE_MATCH | RESTRICTED_MATCH | LOW_POWER_STANDBY_MATCH)
+
+// Warning: funky bit-wise arithmetic: in parallel, for all DROP_IF_SET/UNSET rules
+// check whether the rules are globally enabled, and if so whether the rules are
+// set/unset for the specific uid. DROP if that is the case for ANY of the rules.
+// We achieve this by masking out only the bits/rules we're interested in checking,
+// and negating (via bit-wise xor) the bits/rules that should drop if unset.
+static inline bool isBlockedByUidRules(BpfConfig enabledRules, uint32_t uidRules) {
+ return enabledRules & (DROP_IF_SET | DROP_IF_UNSET) & (uidRules ^ DROP_IF_UNSET);
+}