ArmV9 Cix P1 USB RNDIS 网络开发

1. PC 通过USB Rndis 访问Cix P1共享网络

Setting usb setting 选择usb tethering

Cix P1 新增usb0 网络节点：

console:/ # ifconfig
lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope: Host
UP LOOPBACK RUNNING MTU:65536 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 TX bytes:0

dummy0 Link encap:Ethernet HWaddr 26:d9:24:73:51:1b
inet6 addr: fe80::24d9:24ff:fe73:511b/64 Scope: Link
UP BROADCAST RUNNING NOARP MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 TX bytes:350

eth0 Link encap:Ethernet HWaddr 12:5f:c0:94:ae:6d Driver macb
UP BROADCAST MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 TX bytes:0
Interrupt:104

usb0 Link encap:Ethernet HWaddr f2:90:cc:d9:ae:f8 Driver configfs-gadget.g1
inet addr:192.168.33.17 Bcast:192.168.33.255 Mask:255.255.255.0
inet6 addr: fe80::f090:ccff:fed9:aef8/64 Scope: Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:256 errors:0 dropped:0 overruns:0 frame:0
TX packets:185 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:23574 TX bytes:25574

Pc 新增usb0 网络节点：

stephen@stephen-System-Product-Name:~/workdir/Android14_Beta1/out/target/product/sky1_evb$ ifconfig
docker0: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
inet 192.168.200.1 netmask 255.255.255.0 broadcast 192.168.200.255
ether 02:42:9a:bd:fd:60 txqueuelen 0 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 0 bytes 0 (0.0 B)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

enp5s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 172.18.64.27 netmask 255.255.252.0 broadcast 172.18.67.255
inet6 fe80::1e5b:7181:99c3:182c prefixlen 64 scopeid 0x20<link>
ether 08:bf:b8:41:0e:3d txqueuelen 1000 (Ethernet)
RX packets 7631998 bytes 3895309742 (3.8 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 4803586 bytes 955338435 (955.3 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

lo: flags=73<UP,LOOPBACK,RUNNING> mtu 65536
inet 127.0.0.1 netmask 255.0.0.0
inet6 ::1 prefixlen 128 scopeid 0x10<host>
loop txqueuelen 1000 (Local Loopback)
RX packets 296163 bytes 1388079428 (1.3 GB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 296163 bytes 1388079428 (1.3 GB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

usb0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.33.25 netmask 255.255.255.0 broadcast 192.168.33.255
inet6 fe80::7f01:e9c6:a6af:a10 prefixlen 64 scopeid 0x20<link>
ether 42:57:a7:7e:70:eb txqueuelen 1000 (Ethernet)
RX packets 241 bytes 19028 (19.0 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 331 bytes 48502 (48.5 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0

Pc 通过usb0 访问Cix P1 usb 共享网络

stephen@stephen-System-Product-Name:~/workdir/Android14_Beta1/out/target/product/sky1_evb$ ping -I usb0 www.baidu.com PING www.a.shifen.com (153.3.238.110) 56(84) bytes of data. 64 bytes from 153.3.238.110 (153.3.238.110): icmp_seq=1 ttl=44 time=23.1 ms 64 bytes from 153.3.238.110 (153.3.238.110): icmp_seq=2 ttl=44 time=22.9 ms

2. PC Usb Rndis 共享网络给Cix P1

Android 原生不支持该Feature，需要对应Patch 支持DNS。

diff –git a/DnsProxyListener.cpp b/DnsProxyListener.cpp
index 8064aef7..4d1f7218 100644
— a/DnsProxyListener.cpp
+++ b/DnsProxyListener.cpp
@@ -33,7 +33,7 @@

#include <algorithm>
#include <vector>
–
+#include “resolv_cache.h”
#include <android-base/parseint.h>

@@ -905,8 +905,26 @@ void DnsProxyListener::GetAddrInfoHandler::doDns64Synthesis(int32_t* rv, addrinf
}

void DnsProxyListener::GetAddrInfoHandler::run() {
LOG(INFO) << “GetAddrInfoHandler::run: {” << mNetContext.toString() << “}”;
+ if(mNetContext.app_netid == 0)
+ {
+ const std::vector<std::string> servers = {“10.128.30.12”};
+ const std::vector<std::string> domains = {“”};
+ const std::vector<int32_t>& transportTypes = {aidl::android::net::IDnsResolver::TRANSPORT_ETHERNET, aidl::android::net::IDnsResolver::TRANSPORT_VPN};
+ const aidl::android::net::ResolverOptionsParcel& resolverOptions = {};
+ const res_params params = {
+ .sample_validity = 1800,
+ .success_threshold = 25,
+ .min_samples = 8,
+ .max_samples = 64,
+ .base_timeout_msec = 5000,
+ .retry_count = 2,
+ };
+ LOG(INFO) << “GetAddrInfoHandler::run: resolv_set_nameservers ” << mNetContext.toString() << “}”;
+ resolv_create_cache_for_net(mNetContext.app_netid);
+ resolv_set_nameservers(mNetContext.app_netid, servers, domains, params, resolverOptions, transportTypes);
+ }

Setting usb setting 选择usb tethering

Cix P1 新增usb0 网络节点，配置对应路由：

ip route add 192.168.0.0/24 dev usb0 proto kernel scope link src 192.168.33.17
ip route add default via 192.168.33.17 dev usb0
ip rule add from all lookup main pref 9000

Pc 新增usb0 网络节点，配置对应网络路由：

sudo ip route add 192.168.0.0/24 dev usb0 proto kernel scope link src 192.168.33.25

Pc 设置网络转发：

sudo iptables -A FORWARD -i usb0 -o enp5s0 -j ACCEPT
sudo iptables -A FORWARD -i enp5s0 -o usb0 -m state –state ESTABLISHED,RELATED -j ACCEPT
sudo iptables -t nat -A POSTROUTING -o enp5s0 -j MASQUERADE

Cix P1 通过usb0 访问Pc usb 共享网络