LineageOS/android_packages_modules_Connectivity
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[CLATJ#31] ClatCoordinator: tag raw socket to uid AID_CLAT

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Tag socket as uid AID_CLAT to avoid duplicated data usage counting by
bpf program.

Test: atest FrameworksNetTests
Test: check dumpsys for tag mapping and check logging for socket cookie

$ adb shell dumpsys connectivity trafficcontroller
  mCookieTagMap:
    cookie=28831 tag=0x0 uid=1029

03-02 22:43:13.201  1719  1921 I jniClatCoordinator: tag uid AID_CLAT to socket fd 609, cookie 28831
03-02 22:43:13.217  5496  5496 I clatd   : tunnel.write_fd6 609, cookie 28831, flags 0x0 (debug only)

Bug: 218407445
Change-Id: I67b9f30b143e791ddf59d5627e068ec3107e3328
This commit is contained in:
Hungming Chen
2022-02-11 18:09:26 +08:00
parent edf80c2da8
commit 89d12060e1
3 changed files with 82 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

43
service/jni/com_android_server_connectivity_ClatCoordinator.cpp
View File

@@ -18,6 +18,7 @@
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <linux/if_tun.h>
#include <linux/ioctl.h>
#include <log/log.h>
@@ -27,7 +28,11 @@
#include <sys/wait.h>
#include <string>
#include <bpf/BpfMap.h>
#include <bpf/BpfUtils.h>
#include <bpf_shared.h>
#include <netjniutils/netjniutils.h>
#include <private/android_filesystem_config.h>
#include "libclat/bpfhelper.h"
#include "libclat/clatutils.h"
@@ -473,6 +478,42 @@ static void com_android_server_connectivity_ClatCoordinator_stopClatd(JNIEnv* en
stopClatdProcess(pid);
}
static jlong com_android_server_connectivity_ClatCoordinator_tagSocketAsClat(
JNIEnv* env, jobject clazz, jobject sockJavaFd) {
int sockFd = netjniutils::GetNativeFileDescriptor(env, sockJavaFd);
if (sockFd < 0) {
jniThrowExceptionFmt(env, "java/io/IOException", "Invalid socket file descriptor");
return -1;
}
uint64_t sock_cookie = bpf::getSocketCookie(sockFd);
if (sock_cookie == bpf::NONEXISTENT_COOKIE) {
throwIOException(env, "get socket cookie failed", errno);
return -1;
}
bpf::BpfMap<uint64_t, UidTagValue> cookieTagMap;
auto res = cookieTagMap.init(COOKIE_TAG_MAP_PATH);
if (!res.ok()) {
throwIOException(env, "failed to init the cookieTagMap", res.error().code());
return -1;
}
// Tag raw socket with uid AID_CLAT and set tag as zero because tag is unused in bpf
// program for counting data usage in netd.c. Tagging socket is used to avoid counting
// duplicated clat traffic in bpf stat.
UidTagValue newKey = {.uid = (uint32_t)AID_CLAT, .tag = 0 /* unused */};
res = cookieTagMap.writeValue(sock_cookie, newKey, BPF_ANY);
if (!res.ok()) {
jniThrowExceptionFmt(env, "java/io/IOException", "Failed to tag the socket: %s, fd: %d",
strerror(res.error().code()), cookieTagMap.getMap().get());
return -1;
}
ALOGI("tag uid AID_CLAT to socket fd %d, cookie %" PRIu64 "", sockFd, sock_cookie);
return static_cast<jlong>(sock_cookie);
}
/*
* JNI registration.
*/
@@ -502,6 +543,8 @@ static const JNINativeMethod gMethods[] = {
{"native_stopClatd",
"(Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;I)V",
(void*)com_android_server_connectivity_ClatCoordinator_stopClatd},
{"native_tagSocketAsClat", "(Ljava/io/FileDescriptor;)J",
(void*)com_android_server_connectivity_ClatCoordinator_tagSocketAsClat},
};
int register_com_android_server_connectivity_ClatCoordinator(JNIEnv* env) {

23
service/src/com/android/server/connectivity/ClatCoordinator.java
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@@ -67,6 +67,7 @@ public class ClatCoordinator {
private static final int INVALID_IFINDEX = 0;
private static final int INVALID_PID = 0;
private static final long INVALID_COOKIE = 0;
@NonNull
private final INetd mNetd;
@@ -81,6 +82,7 @@ public class ClatCoordinator {
@Nullable
private String mXlatLocalAddress6 = null;
private int mPid = INVALID_PID;
private long mCookie = INVALID_COOKIE;
@VisibleForTesting
abstract static class Dependencies {
@@ -185,6 +187,13 @@ public class ClatCoordinator {
throws IOException {
native_stopClatd(iface, pfx96, v4, v6, pid);
}
/**
* Tag socket as clat.
*/
public long tagSocketAsClat(@NonNull FileDescriptor sock) throws IOException {
return native_tagSocketAsClat(sock);
}
}
@VisibleForTesting
@@ -335,6 +344,17 @@ public class ClatCoordinator {
throw new IOException("add anycast sockopt failed: " + e);
}
// Tag socket as AID_CLAT to avoid duplicated CLAT data usage accounting.
long cookie;
try {
cookie = mDeps.tagSocketAsClat(writeSock6.getFileDescriptor());
} catch (IOException e) {
tunFd.close();
readSock6.close();
writeSock6.close();
throw new IOException("tag raw socket failed: " + e);
}
// Update our packet socket filter to reflect the new 464xlat IP address.
try {
mDeps.configurePacketSocket(readSock6.getFileDescriptor(), v6, ifaceIndex);
@@ -353,7 +373,9 @@ public class ClatCoordinator {
mNat64Prefix = pfx96;
mXlatLocalAddress4 = v4;
mXlatLocalAddress6 = v6;
mCookie = cookie;
} catch (IOException e) {
// TODO: untag socket.
throw new IOException("Error start clatd on " + iface + ": " + e);
} finally {
tunFd.close();
@@ -403,4 +425,5 @@ public class ClatCoordinator {
throws IOException;
private static native void native_stopClatd(String iface, String pfx96, String v4, String v6,
int pid) throws IOException;
private static native long native_tagSocketAsClat(FileDescriptor sock) throws IOException;
}

16
tests/unit/java/com/android/server/connectivity/ClatCoordinatorTest.java
View File

@@ -82,6 +82,7 @@ public class ClatCoordinatorTest {
private static final int TUN_FD = 534;
private static final int RAW_SOCK_FD = 535;
private static final int PACKET_SOCK_FD = 536;
private static final long RAW_SOCK_COOKIE = 27149;
private static final ParcelFileDescriptor TUN_PFD = new ParcelFileDescriptor(
new FileDescriptor());
private static final ParcelFileDescriptor RAW_SOCK_PFD = new ParcelFileDescriptor(
@@ -258,12 +259,25 @@ public class ClatCoordinatorTest {
/**
* Stop clatd.
*/
@Override
public void stopClatd(@NonNull String iface, @NonNull String pfx96, @NonNull String v4,
@NonNull String v6, int pid) throws IOException {
if (pid == -1) {
fail("unsupported arg: " + pid);
}
}
/**
* Tag socket as clat.
*/
@Override
public long tagSocketAsClat(@NonNull FileDescriptor sock) throws IOException {
if (Objects.equals(RAW_SOCK_PFD.getFileDescriptor(), sock)) {
return RAW_SOCK_COOKIE;
}
fail("unsupported arg: " + sock);
return 0;
}
};
@NonNull
@@ -326,6 +340,8 @@ public class ClatCoordinatorTest {
inOrder.verify(mDeps).addAnycastSetsockopt(
argThat(fd -> Objects.equals(RAW_SOCK_PFD.getFileDescriptor(), fd)),
eq(XLAT_LOCAL_IPV6ADDR_STRING), eq(BASE_IFINDEX));
inOrder.verify(mDeps).tagSocketAsClat(
argThat(fd -> Objects.equals(RAW_SOCK_PFD.getFileDescriptor(), fd)));
inOrder.verify(mDeps).configurePacketSocket(
argThat(fd -> Objects.equals(PACKET_SOCK_PFD.getFileDescriptor(), fd)),
eq(XLAT_LOCAL_IPV6ADDR_STRING), eq(BASE_IFINDEX));