LineageOS/android_packages_modules_Connectivity
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switch to classic bpf macros

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Note: this switches
  com_android_networkstack_tethering_util_setupIcmpFilter
over to relative cbpf which in turn is called from:
  com_android_networkstack_tethering_util_setupNaSocket
  com_android_networkstack_tethering_util_setupNsSocket
and tested by p/m/C's:
  TetheringUtilsTest.java - testIcmpSocketFilters()

Test: TreeHugger, atest TetheringUtilsTest
Signed-off-by: Maciej Żenczykowski <maze@google.com>
Change-Id: I22a5ea8f8e3b879a37fe4acd84f61020661eaa71
This commit is contained in:
Maciej Żenczykowski
2023-03-11 01:19:40 +00:00
parent 5d8992e2b1
commit 32b46a4d36
3 changed files with 13 additions and 18 deletions
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22
Tethering/jni/com_android_networkstack_tethering_util_TetheringUtils.cpp
View File

@@ -18,21 +18,19 @@
#include <error.h>
#include <jni.h>
#include <linux/filter.h>
#include <linux/ipv6.h>
#include <nativehelper/JNIHelp.h>
#include <nativehelper/ScopedUtfChars.h>
#include <netjniutils/netjniutils.h>
#include <net/if.h>
#include <netinet/ether.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <sys/socket.h>
#include <stdio.h>
namespace android {
#include <bpf/BpfClassic.h>
static const uint32_t kIPv6NextHeaderOffset = offsetof(ip6_hdr, ip6_nxt);
static const uint32_t kIPv6PayloadStart = sizeof(ip6_hdr);
static const uint32_t kICMPv6TypeOffset = kIPv6PayloadStart + offsetof(icmp6_hdr, icmp6_type);
namespace android {
static void throwSocketException(JNIEnv *env, const char* msg, int error) {
jniThrowExceptionFmt(env, "java/net/SocketException", "%s: %s", msg, strerror(error));
@@ -42,18 +40,14 @@ static void com_android_networkstack_tethering_util_setupIcmpFilter(JNIEnv *env,
uint32_t type) {
sock_filter filter_code[] = {
// Check header is ICMPv6.
BPF_STMT(BPF_LD | BPF_B | BPF_ABS, kIPv6NextHeaderOffset),
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, IPPROTO_ICMPV6, 0, 3),
BPF_LOAD_IPV6_U8(nexthdr),
BPF2_REJECT_IF_NOT_EQUAL(IPPROTO_ICMPV6),
// Check ICMPv6 type.
BPF_STMT(BPF_LD | BPF_B | BPF_ABS, kICMPv6TypeOffset),
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, type, 0, 1),
BPF_LOAD_NET_RELATIVE_U8(sizeof(ipv6hdr) + offsetof(icmp6_hdr, icmp6_type)),
BPF2_REJECT_IF_NOT_EQUAL(type),
// Accept.
BPF_STMT(BPF_RET | BPF_K, 0xffff),
// Reject.
BPF_STMT(BPF_RET | BPF_K, 0)
BPF_ACCEPT,
};
const sock_fprog filter = {

1
framework/Android.bp
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@@ -183,6 +183,7 @@ cc_library_shared {
"libnativehelper",
],
header_libs: [
"bpf_headers",
"dnsproxyd_protocol_headers",
],
stl: "none",

8
framework/jni/android_net_NetworkUtils.cpp
View File

@@ -23,6 +23,7 @@
#include <netinet/in.h>
#include <string.h>
#include <bpf/BpfClassic.h>
#include <DnsProxydProtocol.h> // NETID_USE_LOCAL_NAMESERVERS
#include <nativehelper/JNIPlatformHelp.h>
#include <utils/Log.h>
@@ -55,11 +56,10 @@ static inline T MakeGlobalRefOrDie(JNIEnv* env, T in) {
static void android_net_utils_attachDropAllBPFFilter(JNIEnv *env, jclass clazz, jobject javaFd)
{
struct sock_filter filter_code[] = {
// Reject all.
BPF_STMT(BPF_RET | BPF_K, 0)
static struct sock_filter filter_code[] = {
BPF_REJECT,
};
struct sock_fprog filter = {
static const struct sock_fprog filter = {
sizeof(filter_code) / sizeof(filter_code[0]),
filter_code,
};