LineageOS/android_packages_modules_Connectivity
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

tethering: DAD Proxy Daemon

Browse Source 
DAD proxy daemon responsible for forwarding NS/NA between
tethered iface and upstream iface.

Change-Id: I2e58e10e7fa7dba6a6f63ad03b000549f3afc37e
This commit is contained in:
Tyler Wear
2020-03-13 11:38:38 -07:00
parent 1ed9e74716
commit 90e4063fd2
10 changed files with 818 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

52
Tethering/jni/android_net_util_TetheringUtils.cpp
View File

@@ -17,18 +17,63 @@
#include <errno.h>
#include <error.h>
#include <jni.h>
#include <linux/filter.h>
#include <nativehelper/JNIHelp.h>
#include <nativehelper/JNIHelpCompat.h>
#include <nativehelper/ScopedUtfChars.h>
#include <net/if.h>
#include <netinet/ether.h>
#include <netinet/ip6.h>
#include <netinet/icmp6.h>
#include <sys/socket.h>
#include <stdio.h>
#define LOG_TAG "TetheringUtils"
#include <android/log.h>
namespace android {
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);
static void android_net_util_setupIcmpFilter(JNIEnv *env, jobject javaFd, 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),
// Check ICMPv6 type.
BPF_STMT(BPF_LD | BPF_B | BPF_ABS, kICMPv6TypeOffset),
BPF_JUMP(BPF_JMP | BPF_JEQ | BPF_K, type, 0, 1),
// Accept or reject.
BPF_STMT(BPF_RET | BPF_K, 0xffff),
BPF_STMT(BPF_RET | BPF_K, 0)
};
const sock_fprog filter = {
sizeof(filter_code) / sizeof(filter_code[0]),
filter_code,
};
int fd = jniGetFDFromFileDescriptor(env, javaFd);
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter, sizeof(filter)) != 0) {
jniThrowExceptionFmt(env, "java/net/SocketException",
"setsockopt(SO_ATTACH_FILTER): %s", strerror(errno));
}
}
static void android_net_util_setupNaSocket(JNIEnv *env, jobject clazz, jobject javaFd)
{
android_net_util_setupIcmpFilter(env, javaFd, ND_NEIGHBOR_ADVERT);
}
static void android_net_util_setupNsSocket(JNIEnv *env, jobject clazz, jobject javaFd)
{
android_net_util_setupIcmpFilter(env, javaFd, ND_NEIGHBOR_SOLICIT);
}
static void android_net_util_setupRaSocket(JNIEnv *env, jobject clazz, jobject javaFd,
jint ifIndex)
{
@@ -125,7 +170,12 @@ static void android_net_util_setupRaSocket(JNIEnv *env, jobject clazz, jobject j
*/
static const JNINativeMethod gMethods[] = {
/* name, signature, funcPtr */
{ "setupRaSocket", "(Ljava/io/FileDescriptor;I)V", (void*) android_net_util_setupRaSocket },
{ "setupNaSocket", "(Ljava/io/FileDescriptor;)V",
(void*) android_net_util_setupNaSocket },
{ "setupNsSocket", "(Ljava/io/FileDescriptor;)V",
(void*) android_net_util_setupNsSocket },
{ "setupRaSocket", "(Ljava/io/FileDescriptor;I)V",
(void*) android_net_util_setupRaSocket },
};
int register_android_net_util_TetheringUtils(JNIEnv* env) {