Use java BpfMap in BpfNetMaps#setUidRule
Bug: 217624062
Test: atest BpfNetMapsTest
android.net.cts.ConnectivityManagerTest#testFirewallBlocking
Change-Id: I79745231edac77d07571fa1909da5b9e811a69c4
diff --git a/service/src/com/android/server/BpfNetMaps.java b/service/src/com/android/server/BpfNetMaps.java
index 648ada2..d7c5a06 100644
--- a/service/src/com/android/server/BpfNetMaps.java
+++ b/service/src/com/android/server/BpfNetMaps.java
@@ -24,6 +24,8 @@
import static android.net.ConnectivityManager.FIREWALL_CHAIN_POWERSAVE;
import static android.net.ConnectivityManager.FIREWALL_CHAIN_RESTRICTED;
import static android.net.ConnectivityManager.FIREWALL_CHAIN_STANDBY;
+import static android.net.ConnectivityManager.FIREWALL_RULE_ALLOW;
+import static android.net.ConnectivityManager.FIREWALL_RULE_DENY;
import static android.system.OsConstants.EINVAL;
import static android.system.OsConstants.ENODEV;
import static android.system.OsConstants.ENOENT;
@@ -35,7 +37,6 @@
import android.system.ErrnoException;
import android.system.Os;
import android.util.Log;
-import android.util.SparseLongArray;
import com.android.internal.annotations.GuardedBy;
import com.android.internal.annotations.VisibleForTesting;
@@ -95,22 +96,6 @@
@VisibleForTesting public static final long OEM_DENY_3_MATCH = (1 << 11);
// LINT.ThenChange(packages/modules/Connectivity/bpf_progs/bpf_shared.h)
- // TODO: Use Java BpfMap instead of JNI code (TrafficController) for map update.
- // Currently, BpfNetMaps uses TrafficController for map update and TrafficController
- // (changeUidOwnerRule and toggleUidOwnerMap) also does conversion from "firewall chain" to
- // "match". Migrating map update from JNI to Java BpfMap will solve this duplication.
- private static final SparseLongArray FIREWALL_CHAIN_TO_MATCH = new SparseLongArray();
- static {
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_DOZABLE, DOZABLE_MATCH);
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_STANDBY, STANDBY_MATCH);
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_POWERSAVE, POWERSAVE_MATCH);
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_RESTRICTED, RESTRICTED_MATCH);
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_LOW_POWER_STANDBY, LOW_POWER_STANDBY_MATCH);
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_OEM_DENY_1, OEM_DENY_1_MATCH);
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_OEM_DENY_2, OEM_DENY_2_MATCH);
- FIREWALL_CHAIN_TO_MATCH.put(FIREWALL_CHAIN_OEM_DENY_3, OEM_DENY_3_MATCH);
- }
-
/**
* Set configurationMap for test.
*/
@@ -203,11 +188,50 @@
*/
@VisibleForTesting
public long getMatchByFirewallChain(final int chain) {
- final long match = FIREWALL_CHAIN_TO_MATCH.get(chain, NO_MATCH);
- if (match == NO_MATCH) {
- throw new ServiceSpecificException(EINVAL, "Invalid firewall chain: " + chain);
+ switch (chain) {
+ case FIREWALL_CHAIN_DOZABLE:
+ return DOZABLE_MATCH;
+ case FIREWALL_CHAIN_STANDBY:
+ return STANDBY_MATCH;
+ case FIREWALL_CHAIN_POWERSAVE:
+ return POWERSAVE_MATCH;
+ case FIREWALL_CHAIN_RESTRICTED:
+ return RESTRICTED_MATCH;
+ case FIREWALL_CHAIN_LOW_POWER_STANDBY:
+ return LOW_POWER_STANDBY_MATCH;
+ case FIREWALL_CHAIN_OEM_DENY_1:
+ return OEM_DENY_1_MATCH;
+ case FIREWALL_CHAIN_OEM_DENY_2:
+ return OEM_DENY_2_MATCH;
+ case FIREWALL_CHAIN_OEM_DENY_3:
+ return OEM_DENY_3_MATCH;
+ default:
+ throw new ServiceSpecificException(EINVAL, "Invalid firewall chain: " + chain);
}
- return match;
+ }
+
+ /**
+ * Get if the chain is allow list or not.
+ *
+ * ALLOWLIST means the firewall denies all by default, uids must be explicitly allowed
+ * DENYLIST means the firewall allows all by default, uids must be explicitly denyed
+ */
+ @VisibleForTesting
+ public boolean isFirewallAllowList(final int chain) {
+ switch (chain) {
+ case FIREWALL_CHAIN_DOZABLE:
+ case FIREWALL_CHAIN_POWERSAVE:
+ case FIREWALL_CHAIN_RESTRICTED:
+ case FIREWALL_CHAIN_LOW_POWER_STANDBY:
+ return true;
+ case FIREWALL_CHAIN_STANDBY:
+ case FIREWALL_CHAIN_OEM_DENY_1:
+ case FIREWALL_CHAIN_OEM_DENY_2:
+ case FIREWALL_CHAIN_OEM_DENY_3:
+ return false;
+ default:
+ throw new ServiceSpecificException(EINVAL, "Invalid firewall chain: " + chain);
+ }
}
private void maybeThrow(final int err, final String msg) {
@@ -412,9 +436,17 @@
* cause of the failure.
*/
public void setUidRule(final int childChain, final int uid, final int firewallRule) {
- synchronized (sUidOwnerMap) {
- final int err = native_setUidRule(childChain, uid, firewallRule);
- maybeThrow(err, "Unable to set uid rule");
+ throwIfPreT("setUidRule is not available on pre-T devices");
+
+ final long match = getMatchByFirewallChain(childChain);
+ final boolean isAllowList = isFirewallAllowList(childChain);
+ final boolean add = (firewallRule == FIREWALL_RULE_ALLOW && isAllowList)
+ || (firewallRule == FIREWALL_RULE_DENY && !isAllowList);
+
+ if (add) {
+ addRule(uid, match, "setUidRule");
+ } else {
+ removeRule(uid, match, "setUidRule");
}
}