LineageOS/android_packages_modules_Connectivity
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Correctly dump IPv4 downstream flows.

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The current code does not print these correctly: it prints the
public address twice and then the NAT address. Fix this to print
the src, nat, and dst addresses.

Also dump the output MAC address.

Example output:

    IPv4 Upstream: [inDstMac] iif(iface) src -> nat -> dst [outDstMac] age
      [66:f1:6f:d8:66:0a] 31(31) 192.168.146.173:48594 -> 11(rmnet_data1) 100.100.109.185:48594 -> 8.8.8.8:853 [00:00:00:00:00:00] 32305ms
      [66:f1:6f:d8:66:0a] 31(31) 192.168.146.173:45806 -> 11(rmnet_data1) 100.100.109.185:45806 -> 8.8.4.4:853 [00:00:00:00:00:00] 32305ms
    IPv4 Downstream: [inDstMac] iif(iface) src -> nat -> dst [outDstMac] age
      [00:00:00:00:00:00] 11(rmnet_data1) 8.8.8.8:853 -> 31(31) 100.100.109.185:48594 -> 192.168.146.173:48594 [0e:a8:7f:ba:76:48] 32305ms
      [00:00:00:00:00:00] 11(rmnet_data1) 8.8.4.4:853 -> 31(31) 100.100.109.185:45806 -> 192.168.146.173:45806 [0e:a8:7f:ba:76:48] 32305ms

Test: manual
Bug: 190783768
Change-Id: I93a82064c95027c7c63cb30baf8482ecddcbd09d
This commit is contained in:
Lorenzo Colitti
2021-06-15 16:59:02 +09:00
parent 70f43ee58e
commit 8569168eda
1 changed files with 27 additions and 17 deletions
Download Patch File Download Diff File Expand all files Collapse all files

44
Tethering/src/com/android/networkstack/tethering/BpfCoordinator.java
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@@ -786,6 +786,7 @@ public class BpfCoordinator {
dumpIpv6ForwardingRules(pw);
dumpIpv4ForwardingRules(pw);
pw.decreaseIndent();
pw.println();
pw.println("Device map:");
pw.increaseIndent();
@@ -872,24 +873,33 @@ public class BpfCoordinator {
}
}
private String ipv4RuleToString(long now, Tether4Key key, Tether4Value value) {
final String private4, public4, dst4;
private String ipv4RuleToString(long now, boolean downstream,
Tether4Key key, Tether4Value value) {
final String src4, public4, dst4;
final int publicPort;
try {
private4 = InetAddress.getByAddress(key.src4).getHostAddress();
dst4 = InetAddress.getByAddress(key.dst4).getHostAddress();
public4 = InetAddress.getByAddress(value.src46).getHostAddress();
src4 = InetAddress.getByAddress(key.src4).getHostAddress();
if (downstream) {
public4 = InetAddress.getByAddress(key.dst4).getHostAddress();
publicPort = key.dstPort;
} else {
public4 = InetAddress.getByAddress(value.src46).getHostAddress();
publicPort = value.srcPort;
}
dst4 = InetAddress.getByAddress(value.dst46).getHostAddress();
} catch (UnknownHostException impossible) {
throw new AssertionError("4-byte array not valid IPv4 address!");
throw new AssertionError("IP address array not valid IPv4 address!");
}
long ageMs = (now - value.lastUsed) / 1_000_000;
return String.format("[%s] %d(%s) %s:%d -> %d(%s) %s:%d -> %s:%d %dms",
key.dstMac, key.iif, getIfName(key.iif), private4, key.srcPort,
final long ageMs = (now - value.lastUsed) / 1_000_000;
return String.format("[%s] %d(%s) %s:%d -> %d(%s) %s:%d -> %s:%d [%s] %dms",
key.dstMac, key.iif, getIfName(key.iif), src4, key.srcPort,
value.oif, getIfName(value.oif),
public4, value.srcPort, dst4, key.dstPort, ageMs);
public4, publicPort, dst4, value.dstPort, value.ethDstMac, ageMs);
}
private void dumpIpv4ForwardingRuleMap(long now, BpfMap<Tether4Key, Tether4Value> map,
IndentingPrintWriter pw) throws ErrnoException {
private void dumpIpv4ForwardingRuleMap(long now, boolean downstream,
BpfMap<Tether4Key, Tether4Value> map, IndentingPrintWriter pw) throws ErrnoException {
if (map == null) {
pw.println("No IPv4 support");
return;
@@ -898,7 +908,7 @@ public class BpfCoordinator {
pw.println("No rules");
return;
}
map.forEach((k, v) -> pw.println(ipv4RuleToString(now, k, v)));
map.forEach((k, v) -> pw.println(ipv4RuleToString(now, downstream, k, v)));
}
private void dumpIpv4ForwardingRules(IndentingPrintWriter pw) {
@@ -906,14 +916,14 @@ public class BpfCoordinator {
try (BpfMap<Tether4Key, Tether4Value> upstreamMap = mDeps.getBpfUpstream4Map();
BpfMap<Tether4Key, Tether4Value> downstreamMap = mDeps.getBpfDownstream4Map()) {
pw.println("IPv4 Upstream: [inDstMac] iif(iface) src -> nat -> dst");
pw.println("IPv4 Upstream: [inDstMac] iif(iface) src -> nat -> dst [outDstMac] age");
pw.increaseIndent();
dumpIpv4ForwardingRuleMap(now, upstreamMap, pw);
dumpIpv4ForwardingRuleMap(now, UPSTREAM, upstreamMap, pw);
pw.decreaseIndent();
pw.println("IPv4 Downstream: [inDstMac] iif(iface) src -> nat -> dst");
pw.println("IPv4 Downstream: [inDstMac] iif(iface) src -> nat -> dst [outDstMac] age");
pw.increaseIndent();
dumpIpv4ForwardingRuleMap(now, downstreamMap, pw);
dumpIpv4ForwardingRuleMap(now, DOWNSTREAM, downstreamMap, pw);
pw.decreaseIndent();
} catch (ErrnoException e) {
pw.println("Error dumping IPv4 map: " + e);