fix last commit

README.md

@@ -5,11 +5,13 @@ A Tunnel which turns UDP Traffic into Encrypted FakeTCP/UDP/ICMP Traffic by usin
 
 ![image0](images/image0.PNG)
 
-When used alone,udp2raw tunnels only UDP traffic. Nevertheless,if you used udp2raw + any UDP-based VPN together,you can tunnel any traffic(include TCP/UDP/ICMP),currently OpenVPN/L2TP/ShadowVPN and [tinyFecVPN](https://github.com/wangyu-/tinyFecVPN) are confirmed to be supported. 
+When used alone,udp2raw tunnels only UDP traffic. Nevertheless,if you used udp2raw + any UDP-based VPN together,you can tunnel any traffic(include TCP/UDP/ICMP),currently OpenVPN/L2TP/ShadowVPN and [tinyfecVPN](https://github.com/wangyu-/tinyfecVPN) are confirmed to be supported. 
 
 ![image_vpn](images/udp2rawopenvpn.PNG)
 
-[简体中文](/doc/README.zh-cn.md)
+[简体中文](/doc/README.zh-cn.md)(内容更丰富)
+
+[udp2raw wiki](https://github.com/wangyu-/udp2raw-tunnel/wiki)
 
 # Support Platforms
 Linux host (including desktop Linux,Android phone/tablet,OpenWRT router,or Raspberry PI) with root access.
@@ -51,22 +53,6 @@ For example, if you use udp2raw + OpenVPN, OpenVPN won't lose connection after a
 ### Keywords
 `Bypass UDP QoS` `Bypass UDP Blocking` `Bypass OpenVPN TCP over TCP problem` `OpenVPN over ICMP` `UDP to ICMP tunnel` `UDP to TCP tunnel` `UDP over ICMP` `UDP over TCP`
 
-# Frequently Asked Questions
-### Q: What is the advantage of using udp2raw FakeTCP mode,why not use a TCP-based VPN(such as OpenVPN TCP mode)?
-Answer: **TCP doesnt allow real-time/out-of-order delivery**. **If you use OpenVPN TCP mode to turn UDP traffic into TCP,there will be latency issue**:the loss of a single packet blocks all following packet until re-transmission is done. This will cause unacceptable delay for gaming and voice chatting.
-
-**TCP also has re-transmission and congestion control which cant be disabled.** UDP programs usualy want to control packet sending rate by themselves. If you use OpenVPN TCP mode this cant be done because of the congestion control of underlying TCP protocol. Further more,with the re-transmission of underlying TCP,**if you send too many udp packets via an OpenVPN TCP connection,the connection will become completely unusable for a while**(It will eventually recover as most of the re-transmission is done,but it wont be very soon).
-
-Those issues exist for almost all TCP-based VPNs.
-
-For udp2raw there is no underlying TCP protocol,udp2raw just add TCP headers to UDP packets directly by using raw socket. It supports real-time/out-of-order delivery,there is no re-transmission and congestion control. **Udp2raw doesnt have all above issues**.
-
-### Q: Is udp2raw designed for replacing VPN?
-Answer: No. Udp2raw is designed for bypassing UDP restrictions. It doesnt have all of the features a VPN has(such as transparently redirect all traffic).
-
-Instead of replacing VPN,udp2raw can be used with any UDP-based VPN together to grant UDP-based VPN the ablity of bypassing UDP restrictions,while not having the performance issue involved by a TCP-based VPN. Check [this link](https://github.com/wangyu-/udp2raw-tunnel#tunneling-any-traffic-via-raw-traffic-by-using-udp2raw-openvpn) for more info.
-
-
 # Getting Started
 ### Installing
 Download binary release from https://github.com/wangyu-/udp2raw-tunnel/releases
@@ -81,6 +67,8 @@ Assume your UDP is blocked or being QOS-ed or just poorly supported. Assume your
 # Run at client side
 ./udp2raw_amd64 -c -l0.0.0.0:3333  -r44.55.66.77:4096 -a -k "passwd" --raw-mode faketcp
 ```
+(The above commands need to be run as root. For better security, with some extra steps, you can run udp2raw as non-root. Check [this link](https://github.com/wangyu-/udp2raw-tunnel/wiki/run-udp2raw-as-non-root) for more info  )
+
 ###### Server Output:
 ![](images/output_server.PNG)
 ###### Client Output:
@@ -91,9 +79,9 @@ Now,an encrypted raw tunnel has been established between client and server throu
 ### Note
 To run on Android, check [Android_Guide](/doc/android_guide.md)
 
-If you have connection problems.Take a look at `--seq-mode` option.
+If you have connection problems. Take a look at `--seq-mode` option.
+
 
-You can run udp2raw with a non-root account(for better security).Take a look at [#26](https://github.com/wangyu-/udp2raw-tunnel/issues/26) for more info. 
 
 # Advanced Topic
 ### Usage
@@ -240,7 +228,7 @@ raw_mode: faketcp  cipher_mode: aes128cbc  auth_mode: md5
 
 4. Supports almost any UDP-based VPN
 
-More details at [openvpn+udp2raw_guide](/doc/openvpn_guide.md)
+More details at [openvpn+udp2raw_guide](https://github.com/wangyu-/udp2raw-tunnel/wiki/udp2raw-openvpn-config-guide)
 ## Speed-up tcp connection via raw traffic by using udp2raw+kcptun
 kcptun is a tcp connection speed-up program,it speeds-up tcp connection by using kcp protocol on-top of udp.by using udp2raw,you can use kcptun while udp is QoSed or blocked.
 (kcptun, https://github.com/xtaci/kcptun)
@@ -285,3 +273,9 @@ https://arxiv.org/abs/1103.0463
 http://korz.cs.yale.edu/2009/tng/papers/pfldnet10.pdf
 
 https://pdfs.semanticscholar.org/9e6f/e2306f4385b4eb5416d1fcab16e9361d6ba3.pdf
+
+# wiki
+
+Check wiki for more info:
+
+https://github.com/wangyu-/udp2raw-tunnel/wiki

common.cpp

@@ -16,7 +16,7 @@ u64_t get_current_time()
 {
 	timespec tmp_time;
 	clock_gettime(CLOCK_MONOTONIC, &tmp_time);
-	return tmp_time.tv_sec*1000+tmp_time.tv_nsec/(1000*1000l);
+	return ((u64_t)tmp_time.tv_sec)*1000llu+((u64_t)tmp_time.tv_nsec)/(1000*1000llu);
 }
 
 u64_t pack_u64(u32_t a,u32_t b)

common.h

@@ -85,7 +85,7 @@ struct ip_port_t
 
 typedef u64_t fd64_t;
 
-const int max_data_len=1600;
+const int max_data_len=1800;
 const int buf_len=max_data_len+400;
 
 u64_t get_current_time();

connection.cpp

@@ -228,6 +228,10 @@ conv_manager_t::~conv_manager_t()
 	 void conn_info_t::recover(const conn_info_t &conn_info)
 	 {
 			raw_info=conn_info.raw_info;
+
+			raw_info.rst_received=0;
+			raw_info.disabled=0;
+
 			last_state_time=conn_info.last_state_time;
 			last_hb_recv_time=conn_info.last_hb_recv_time;
 			last_hb_sent_time=conn_info.last_hb_sent_time;
@@ -238,6 +242,7 @@ conv_manager_t::~conv_manager_t()
 			my_roller=0;//no need to set,but for easier debug,set it to zero
 			oppsite_roller=0;//same as above
 			last_oppsite_roller_time=0;
+
 	 }
 
 	void conn_info_t::re_init()
@@ -642,7 +647,7 @@ int send_data_safer(conn_info_t &conn_info,const char* data,int len,u32_t conv_n
 	return 0;
 
 }
-int parse_safer(conn_info_t &conn_info,const char * input,int input_len,char &type,char* &data,int &len)//subfunction for recv_safer,allow overlap
+int reserved_parse_safer(conn_info_t &conn_info,const char * input,int input_len,char &type,char* &data,int &len)//subfunction for recv_safer,allow overlap
 {
 	 static char recv_data_buf[buf_len];
 
@@ -738,7 +743,7 @@ int recv_safer(conn_info_t &conn_info,char &type,char* &data,int &len)///safer t
 
 	if(recv_raw0(conn_info.raw_info,recv_data,recv_len)!=0) return -1;
 
-	return parse_safer(conn_info,recv_data,recv_len,type,data,len);
+	return reserved_parse_safer(conn_info,recv_data,recv_len,type,data,len);
 }
 
 void server_clear_function(u64_t u64)//used in conv_manager in server mode.for server we have to use one udp fd for one conv(udp connection),

connection.h

@@ -154,12 +154,12 @@ void server_clear_function(u64_t u64);
 
 int send_bare(raw_info_t &raw_info,const char* data,int len);//send function with encryption but no anti replay,this is used when client and server verifys each other
 //you have to design the protocol carefully, so that you wont be affect by relay attack
-int reserved_parse_bare(const char *input,int input_len,char* & data,int & len); // a sub function used in recv_bare
+//int reserved_parse_bare(const char *input,int input_len,char* & data,int & len); // a sub function used in recv_bare
 int recv_bare(raw_info_t &raw_info,char* & data,int & len);//recv function with encryption but no anti replay,this is used when client and server verifys each other
 //you have to design the protocol carefully, so that you wont be affect by relay attack
 int send_handshake(raw_info_t &raw_info,id_t id1,id_t id2,id_t id3);// a warp for send_bare for sending handshake(this is not tcp handshake) easily
 int send_safer(conn_info_t &conn_info,char type,const char* data,int len);  //safer transfer function with anti-replay,when mutually verification is done.
 int send_data_safer(conn_info_t &conn_info,const char* data,int len,u32_t conv_num);//a wrap for  send_safer for transfer data.
-int parse_safer(conn_info_t &conn_info,const char * input,int input_len,char &type,char* &data,int &len);//subfunction for recv_safer,allow overlap
+//int reserved_parse_safer(conn_info_t &conn_info,const char * input,int input_len,char &type,char* &data,int &len);//subfunction for recv_safer,allow overlap
 int recv_safer(conn_info_t &conn_info,char &type,char* &data,int &len);///safer transfer function with anti-replay,when mutually verification is done.
 #endif /* CONNECTION_H_ */

doc/README.zh-cn.md

@@ -10,6 +10,8 @@ udp2raw tunnel，通过raw socket给UDP包加上TCP或ICMP header，进而绕过
 
 [udp2raw+finalspeed step_by_step教程](finalspeed_step_by_step.md)
 
+[udp2raw wiki](https://github.com/wangyu-/udp2raw-tunnel/wiki)
+
 **提示：**
 
 udp2raw不是加速器，只是一个帮助你绕过UDP限制的工具。如果你需要UDP加速器，请看UDPspeeder。
@@ -24,13 +26,15 @@ Release中提供了`amd64`、`x86`、`arm`、`mips_be`、`mips_le`的预编译bi
 
 ##### 对于windows和mac用户：
 
-在虚拟机中可以稳定使用（udp2raw跑在Linux里，其他应用照常跑在window里；确保虚拟机网卡工作在桥接模式）。可以使用[这个](https://github.com/wangyu-/udp2raw-tunnel/releases/download/20171108.0/lede-17.01.2-x86_virtual_machine_image.zip)虚拟机镜像，大小只有7.5mb，免去在虚拟机里装系统的麻烦；虚拟机自带ssh server，可以scp拷贝文件，可以ssh进去，可以复制粘贴，root密码123456。
+可以把udp2raw运行在虚拟机上(网络必须是桥接模式)。
 
-如果你的网络不允许桥接，也是有办法用的，具体方法请看wiki。
+另外可以参考：
+
+https://github.com/wangyu-/udp2raw-tunnel/wiki/在windows-mac上运行udp2raw客户端，带图形界面
 
 ##### 对于ios和游戏主机用户：
 
-可以把udp2raw运行在局域网的其他机器上。最好的办法是买个能刷OpenWrt/LEDE/梅林的路由器，把udp2raw运行在路由器上。
+可以把udp2raw运行在局域网的其他机器/虚拟机上。最好的办法是买个能刷OpenWrt/LEDE/梅林的路由器，把udp2raw运行在路由器上。
 
 # 功能特性
 ### 把udp流量伪装成tcp /icmp
@@ -79,11 +83,13 @@ https://github.com/wangyu-/udp2raw-tunnel/releases
 
 ```
 在server端运行:
-./udp2raw_amd64 -s -l0.0.0.0:4096 -r 127.0.0.1:7777  -a -k "passwd" --raw-mode faketcp
+./udp2raw_amd64 -s -l0.0.0.0:4096  -r127.0.0.1:7777   -a -k "passwd" --raw-mode faketcp   --cipher-mode xor
 
 在client端运行:
-./udp2raw_amd64 -c -l0.0.0.0:3333  -r44.55.66.77:4096 -a -k "passwd" --raw-mode faketcp
+./udp2raw_amd64 -c -l0.0.0.0:3333  -r44.55.66.77:4096 -a -k "passwd" --raw-mode faketcp   --cipher-mode xor
 ```
+(以上例子需要用root账号运行。 用非root运行udp2raw需要一些额外的步骤，具体方法请看 [这个](https://github.com/wangyu-/udp2raw-tunnel/wiki/run-udp2raw-as-non-root) 链接。用非root运行更安全)
+
 ###### Server端输出:
 ![](/images/output_server.PNG)
 ###### Client端输出:
@@ -96,14 +102,14 @@ https://github.com/wangyu-/udp2raw-tunnel/releases
 不论你用udp2raw来加速kcptun还是vpn,为了稳定使用,都需要设置合理的MTU（在kcptun/vpn里设置，而不是在udp2raw里），建议把MTU设置成1200。client和server端都要设置。
 
 ### 提醒
+`--cipher-mode xor`表示仅使用简单的XOR加密，这样可以节省CPU占用，以免CPU成为速度瓶颈。如果你需要更强的加密，可以去掉此选项，使用默认的AES加密。加密相关的选项见后文的`--cipher-mode`和`--auth-mode`。
+
 如果要在anroid上运行，请看[Android简明教程](/doc/android_guide.md)
 
 如果要在梅林固件的路由器上使用，添加`--lower-level auto` `--keep-rule`
 
 如果client和server无法连接，或者连接经常断开，请看一下`--seq-mode`的用法，尝试不同的seq-mode。
 
-udp2raw可以用非root账号运行，这样更安全。具体方法见：[#26](https://github.com/wangyu-/udp2raw-tunnel/issues/26) 
-
 # 进阶操作说明
 
 ### 命令选项
@@ -164,7 +170,7 @@ other options:
 
 用raw收发udp包也类似，只是内核回复的是icmp unreachable。而用raw 收发icmp，内核会自动回复icmp echo。都需要相应的iptables规则。
 ### `--cipher-mode` 和 `--auth-mode` 
-如果要最大的安全性建议用aes128cbc+md5。如果要运行再路由器上，建议xor+simple。但是注意xor+simple只能骗过防火墙的包检测，不能防止真正的攻击者。
+如果要最大的安全性建议用aes128cbc+md5。如果要运行在路由器上，建议用xor+simple，可以节省CPU。但是注意xor+simple只能骗过防火墙的包检测，不能防止真正的攻击者。
 
 ### `--seq-mode`
 facktcp模式并没有模拟tcp的全部。所以理论上有办法把faketcp和真正的tcp流量区分开来（虽然大部分ISP不太可能做这种程度的包检测）。seq-mode可以改变一些seq ack的行为。如果遇到了连接问题，可以尝试更改。在我这边的移动线路用3种模式都没问题。
@@ -288,3 +294,9 @@ Transparently tunnel your IP traffic through ICMP echo and reply packets.
 
 https://github.com/DhavalKapil/icmptunnel
 
+# wiki
+
+更多内容请看 wiki:
+
+https://github.com/wangyu-/udp2raw-tunnel/wiki
+

doc/build_guide.md

@@ -1,8 +1,10 @@
 # udp2raw build guide
 
-the guide on how to build udp2raw to you own platform
+the guide on how to build udp2raw
 
-## linux platform which supports local compile
+## Build udp2raw for a specific platform
+
+### linux platform which supports local compile
 such as PC,raspberry pi
 
 ##### install git
@@ -36,7 +38,7 @@ sudo yum groupinstall 'Development Tools'
 
 run 'make'，compilation done. the udp2raw file is the just compiled binary
 
-## platform which needs cross-compile
+### platform which needs cross-compile
 such as openwrt router,run following instructions on your PC
 
 ##### install git
@@ -74,3 +76,17 @@ cc_cross=/home/wangyu/Desktop/OpenWrt-SDK-15.05-ar71xx-generic_gcc-4.8-linaro_uC
 run `make cross`，the just generated `udp2raw_cross` is the binary,compile done. copy it to your router to run.
 
 `make cross` generates non-static binary. If you have any problem on running it,try to compile a static binary by using `make cross2` or `make cross3`.If your toolchain supports static compiling, usually one of them will succeed. The generated file is still named `udp2raw_cross`.
+
+
+
+## Build a full release (include all binaries supported in the makefile)
+
+1. make sure your linux is amd64 version
+
+2. clone the repo
+
+3. make sure you have g++ , make sure your g++ support the `-m32` option; make your your have installed libraries for `-m32` option
+
+4. download https://github.com/wangyu-/files/releases/download/files/toolchains.tar.gz , and extract it to the right position (according to the makefile)
+
+5. run `make release` inside udp2raw's directory

doc/kcptun_step_by_step.md

@@ -6,7 +6,9 @@
 ### 环境要求
 两边的主机都是linux，有root权限。 可以是openwrt路由器或树莓派，也可以是root了的android。
 
-(windows和mac可以用release里发布的预装了udp2raw的openwrt_x86虚拟机镜像，容量4.4mb,开机即用)
+在windows/mac上运行udp2raw可以参考这个教程：
+
+https://github.com/wangyu-/udp2raw-tunnel/wiki/在windows-mac上运行udp2raw客户端，带图形界面
 
 
 ### 安装

encrypt.cpp

@@ -17,23 +17,13 @@ static int8_t zero_iv[]={0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,   0,0,0,0};//this prog
 ****/
 
 char key[16];//generated from key_string by md5.
-/*
-TODO
-
-Change md5 to HMAC-md5 if necessary.Change padding to PKCS#7 style if necessary.
-
-Need someone with cryptography knowledge to help review the encryption method.
-
-Change them if necessary(I can do this by myself,if it turns out to be necessary).
-
-github issue:
-
-https://github.com/wangyu-/udp2raw-tunnel/issues/17
-
-*/
+//TODO key derive function
 
 unordered_map<int, const char *> auth_mode_tostring = {{auth_none, "none"}, {auth_md5, "md5"}, {auth_crc32, "crc32"},{auth_simple,"simple"}};
+//TODO HMAC-md5 ,HMAC-sha1
+
 unordered_map<int, const char *> cipher_mode_tostring={{cipher_none,"none"},{cipher_aes128cbc,"aes128cbc"},{cipher_xor,"xor"}};
+//TODO aes-gcm
 
 auth_mode_t auth_mode=auth_md5;
 cipher_mode_t cipher_mode=cipher_aes128cbc;
@@ -356,13 +346,28 @@ int my_decrypt(const char *data,char *output,int &len,char * key)
 	return 0;
 }
 
-int my_encrypt_pesudo_header(uint8_t *data,uint8_t *output,int &len,uint8_t * key,uint8_t *header,int hlen)
+int encrypt_AE(const char *data,char *output,int &len,char * key)
 {
-
-	return 0;
-}
-int my_decrypt_pesudo_header(uint8_t *data,uint8_t *output,int &len,uint8_t * key,uint8_t *header,int hlen)
-{
-	return 0;
+	//TODO
+	//use encrypt-then-MAC scheme
+	return -1;
+}
+
+int decrypt_AE(const char *data,char *output,int &len,char * key)
+{
+	//TODO
+	return -1;
+}
+
+int encrypt_AEAD(uint8_t *data,uint8_t *output,int &len,uint8_t * key,uint8_t *header,int hlen)
+{
+	//TODO
+	return -1;
+}
+
+int decrypt_AEAD(uint8_t *data,uint8_t *output,int &len,uint8_t * key,uint8_t *header,int hlen)
+{
+	//TODO
+	return -1;
 }
 

encrypt.h

@@ -17,9 +17,6 @@ extern char key[16];
 int my_encrypt(const char *data,char *output,int &len,char * key);
 int my_decrypt(const char *data,char *output,int &len,char * key);
 
-int my_encrypt_pesudo_header(uint8_t *data,uint8_t *output,int &len,uint8_t * key,uint8_t *header,int hlen);
-int my_decrypt_pesudo_header(uint8_t *data,uint8_t *output,int &len,uint8_t * key,uint8_t *header,int hlen);
-
 
 unsigned short csum(const unsigned short *ptr,int nbytes) ;
 

main.cpp

@@ -10,11 +10,13 @@
 
 char hb_buf[buf_len];
 
+int on_epoll_recv_event=0;  //TODO, just a flag to help detect epoll infinite shoot
 
 int server_on_raw_recv_pre_ready(conn_info_t &conn_info,char * ip_port,u32_t tmp_oppsite_const_id);
 int server_on_raw_recv_ready(conn_info_t &conn_info,char * ip_port,char type,char *data,int data_len);
 int server_on_raw_recv_handshake1(conn_info_t &conn_info,char * ip_port,char * data, int data_len);
 
+
 int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is ready in epoll
 {
 	//keep_iptables_rule();
@@ -28,9 +30,19 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
 
 	mylog(log_trace,"<client_on_timer,send_info.ts_ack= %u>\n",send_info.ts_ack);
 
+	if(raw_info.disabled)
+	{
+		conn_info.state.client_current_state=client_idle;
+		conn_info.my_id=get_true_random_number_nz();
+
+		mylog(log_info,"state back to client_idle\n");
+	}
 
 	if(conn_info.state.client_current_state==client_idle)
 	{
+		raw_info.rst_received=0;
+		raw_info.disabled=0;
+
 		fail_time_counter++;
 		if(max_fail_time>0&&fail_time_counter>max_fail_time)
 		{
@@ -41,6 +53,8 @@ int client_on_timer(conn_info_t &conn_info) //for client. called when a timer is
 		conn_info.blob->anti_replay.re_init();
 		conn_info.my_id = get_true_random_number_nz(); ///todo no need to do this everytime
 
+
+
 		u32_t new_ip=0;
 		if(!force_source_ip&&get_src_adress(new_ip,remote_ip_uint32,remote_port)==0)
 		{
@@ -610,13 +624,15 @@ int server_on_raw_recv_multi() //called when server received an raw packet
 
 		conn_info_t &conn_info=conn_manager.find_insert(ip,port);
 		conn_info.raw_info=tmp_raw_info;
+		raw_info_t &raw_info=conn_info.raw_info;
+
+		packet_info_t &send_info=conn_info.raw_info.send_info;
+		packet_info_t &recv_info=conn_info.raw_info.recv_info;
 
 		//conn_info.ip_port.ip=ip;
 		//conn_info.ip_port.port=port;
 
-		packet_info_t &send_info=conn_info.raw_info.send_info;
-		packet_info_t &recv_info=conn_info.raw_info.recv_info;
-		raw_info_t &raw_info=conn_info.raw_info;
+
 
 		send_info.src_ip=recv_info.dst_ip;
 		send_info.src_port=recv_info.dst_port;
@@ -645,6 +661,8 @@ int server_on_raw_recv_multi() //called when server received an raw packet
 	}
 
 
+
+
 	conn_info_t & conn_info=conn_manager.find_insert(ip,port);//insert if not exist
 	packet_info_t &send_info=conn_info.raw_info.send_info;
 	packet_info_t &recv_info=conn_info.raw_info.recv_info;
@@ -1049,10 +1067,31 @@ int client_event_loop()
 			u32_t dest_ip;
 			string if_name_string;
 			string hw_string;
-			if(find_lower_level_info(remote_ip_uint32,dest_ip,if_name_string,hw_string)!=0)
+
+			if(retry_on_error==0)
 			{
-				mylog(log_fatal,"auto detect lower-level info failed for %s,specific it manually\n",remote_ip);
-				myexit(-1);
+				if(find_lower_level_info(remote_ip_uint32,dest_ip,if_name_string,hw_string)!=0)
+				{
+					mylog(log_fatal,"auto detect lower-level info failed for %s,specific it manually\n",remote_ip);
+					myexit(-1);
+				}
+			}
+			else
+			{
+				int ok=0;
+				while(!ok)
+				{
+					if(find_lower_level_info(remote_ip_uint32,dest_ip,if_name_string,hw_string)!=0)
+					{
+						mylog(log_warn,"auto detect lower-level info failed for %s,retry in %d seconds\n",remote_ip,retry_on_error_interval);
+						sleep(retry_on_error_interval);
+					}
+					else
+					{
+						ok=1;
+					}
+
+				}
 			}
 			mylog(log_info,"we are running at lower-level (auto) mode,%s %s %s\n",my_ntoa(dest_ip),if_name_string.c_str(),hw_string.c_str());
 
@@ -1086,11 +1125,32 @@ int client_event_loop()
 	if(source_ip_uint32==0)
 	{
 		mylog(log_info,"get_src_adress called\n");
-		if(get_src_adress(source_ip_uint32,remote_ip_uint32,remote_port)!=0)
+		if(retry_on_error==0)
 		{
-			mylog(log_fatal,"the trick to auto get source ip failed,you should specific an ip by --source-ip\n");
-			myexit(-1);
+			if(get_src_adress(source_ip_uint32,remote_ip_uint32,remote_port)!=0)
+			{
+				mylog(log_fatal,"the trick to auto get source ip failed, maybe you dont have internet access\n");
+				myexit(-1);
+			}
 		}
+		else
+		{
+			int ok=0;
+			while(!ok)
+			{
+				if(get_src_adress(source_ip_uint32,remote_ip_uint32,remote_port)!=0)
+				{
+					mylog(log_warn,"the trick to auto get source ip failed, maybe you dont have internet access, retry in %d seconds\n",retry_on_error_interval);
+					sleep(retry_on_error_interval);
+				}
+				else
+				{
+					ok=1;
+				}
+
+			}
+		}
+
 	}
 	in_addr tmp;
 	tmp.s_addr=source_ip_uint32;
@@ -1252,12 +1312,18 @@ int client_event_loop()
 				int recv_len;
 				struct sockaddr_in udp_new_addr_in={0};
 				socklen_t udp_new_addr_len = sizeof(sockaddr_in);
-				if ((recv_len = recvfrom(udp_fd, buf, max_data_len, 0,
+				if ((recv_len = recvfrom(udp_fd, buf, max_data_len+1, 0,
 						(struct sockaddr *) &udp_new_addr_in, &udp_new_addr_len)) == -1) {
 					mylog(log_error,"recv_from error,this shouldnt happen at client\n");
 					myexit(1);
 				};
 
+				if(recv_len==max_data_len+1)
+				{
+					mylog(log_warn,"huge packet, data_len > %d,dropped\n",max_data_len);
+					continue;
+				}
+
 				if(recv_len>=mtu_warn)
 				{
 					mylog(log_warn,"huge packet,data len=%d (>=%d).strongly suggested to set a smaller mtu at upper level,to get rid of this warn\n ",recv_len,mtu_warn);
@@ -1431,6 +1497,8 @@ int server_event_loop()
 		}
 		mylog(log_info,"fifo_file=%s\n",fifo_file);
 	}
+
+
 	while(1)////////////////////////
 	{
 
@@ -1597,10 +1665,16 @@ int server_event_loop()
 
 				int fd=fd_manager.to_fd(fd64);
 
-				int recv_len=recv(fd,buf,max_data_len,0);
+				int recv_len=recv(fd,buf,max_data_len+1,0);
 
 				mylog(log_trace,"received a packet from udp_fd,len:%d\n",recv_len);
 
+				if(recv_len==max_data_len+1)
+				{
+					mylog(log_warn,"huge packet, data_len > %d,dropped\n",max_data_len);
+					continue;
+				}
+
 				if(recv_len<0)
 				{
 					mylog(log_debug,"udp fd,recv_len<0 continue,%s\n",strerror(errno));
@@ -1676,7 +1750,11 @@ int main(int argc, char *argv[])
 
 	if(geteuid() != 0)
 	{
-		mylog(log_error,"root check failed,make sure you run this program with root,we can try to continue,but it will likely fail\n");
+		mylog(log_warn,"root check failed, it seems like you are using a non-root account. we can try to continue, but it may fail. If you want to run udp2raw as non-root, you have to add iptables rule manually, and grant udp2raw CAP_NET_RAW capability, check README.md in repo for more info.\n");
+	}
+	else
+	{
+		mylog(log_warn,"you can run udp2raw with non-root account for better security. check README.md in repo for more info.\n");
 	}
 
 	local_ip_uint32=inet_addr(local_ip);

makefile

@@ -1,10 +1,12 @@
 cc_cross=/home/wangyu/Desktop/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 cc_local=g++
+#cc_local=/opt/cross/x86_64-linux-musl/bin/x86_64-linux-musl-g++
 #cc_mips34kc=/toolchains/OpenWrt-SDK-ar71xx-for-linux-x86_64-gcc-4.8-linaro_uClibc-0.9.33.2/staging_dir/toolchain-mips_34kc_gcc-4.8-linaro_uClibc-0.9.33.2/bin/mips-openwrt-linux-g++
 cc_mips24kc_be=/toolchains/lede-sdk-17.01.2-ar71xx-generic_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-mips_24kc_gcc-5.4.0_musl-1.1.16/bin/mips-openwrt-linux-musl-g++
 cc_mips24kc_le=/toolchains/lede-sdk-17.01.2-ramips-mt7621_gcc-5.4.0_musl-1.1.16.Linux-x86_64/staging_dir/toolchain-mipsel_24kc_gcc-5.4.0_musl-1.1.16/bin/mipsel-openwrt-linux-musl-g++
 #cc_arm= /toolchains/gcc-linaro-4.9.4-2017.01-x86_64_arm-linux-gnueabi/bin/arm-linux-gnueabi-g++ -march=armv6 -marm 
 cc_arm= /toolchains/arm-2014.05/bin/arm-none-linux-gnueabi-g++
+#cc_arm=/toolchains/lede-sdk-17.01.2-brcm2708-bcm2708_gcc-5.4.0_musl-1.1.16_eabi.Linux-x86_64/staging_dir/toolchain-arm_arm1176jzf-s+vfp_gcc-5.4.0_musl-1.1.16_eabi/bin/arm-openwrt-linux-muslgnueabi-g++
 #cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
 FLAGS= -std=c++11 -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers
 
@@ -47,6 +49,10 @@ mips24kc_le_asm_aes: git_version
 #	${cc_bcm2708} -o ${NAME}_bcm2708  -I. ${SOURCES} ${FLAGS} -lrt -static -O3
 amd64:git_version
 	${cc_local}   -o ${NAME}_$@    -I. ${SOURCES} ${FLAGS} -lrt -static -O3
+
+amd64_perf:git_version
+	${cc_local}   -o ${NAME}_$@    -I. ${SOURCES} ${FLAGS} -lrt -static -O0 -fno-omit-frame-pointer -g
+
 amd64_hw_aes:git_version
 	${cc_local}   -o ${NAME}_$@   -I. ${SOURCES_AES_ACC} ${FLAGS} -lrt -static -O3 lib/aes_acc/asm/x64.S
 x86:git_version
@@ -56,6 +62,9 @@ x86_asm_aes:git_version
 arm:git_version
 	${cc_arm}   -o ${NAME}_$@      -I. ${SOURCES} ${FLAGS} -lrt -static -O3
 
+arm_perf:git_version
+	${cc_arm}   -o ${NAME}_$@      -I. ${SOURCES} ${FLAGS} -lrt -static -mapcs-frame -fno-omit-frame-pointer -g -O0 -lgcc_eh
+
 arm_asm_aes:git_version
 	${cc_arm}   -o ${NAME}_$@    -I. ${SOURCES_AES_ACC} ${FLAGS} -lrt -static -O3 lib/aes_acc/asm/arm.S
 

misc.cpp

@@ -18,6 +18,10 @@ int hb_len=1200;
 
 int mtu_warn=1375;//if a packet larger than mtu warn is receviced,there will be a warning
 
+int max_rst_to_show=15;
+
+int max_rst_allowed=-1;
+
 
 fd_manager_t fd_manager;
 
@@ -44,12 +48,18 @@ int auto_add_iptables_rule=0;//if -a is set
 int generate_iptables_rule=0;//if -g is set
 int generate_iptables_rule_add=0;// if --gen-add is set
 
+int retry_on_error=0;
+
 int debug_resend=0; // debug only
 
 char key_string[1000]= "secret key";// -k option
 
 char fifo_file[1000]="";
 
+int clear_iptables=0;
+int wait_xtables_lock=0;
+string iptables_command0="iptables ";
+string iptables_command="";
 string iptables_pattern="";
 int iptables_rule_added=0;
 int iptables_rule_keeped=0;
@@ -153,11 +163,13 @@ void print_help()
 	printf("    --lower-level         <string>        send packets at OSI level 2, format:'if_name#dest_mac_adress'\n");
 	printf("                                          ie:'eth0#00:23:45:67:89:b9'.or try '--lower-level auto' to obtain\n");
 	printf("                                          the parameter automatically,specify it manually if 'auto' failed\n");
+	printf("    --wait-lock                           wait for xtables lock while invoking iptables, need iptables v1.4.20+\n");
 	printf("    --gen-add                             generate iptables rule and add it permanently,then exit.overrides -g\n");
 	printf("    --keep-rule                           monitor iptables and auto re-add if necessary.implys -a\n");
 	printf("    --hb-len              <number>        length of heart-beat packet, >=0 and <=1500\n");
 	printf("    --mtu-warn            <number>        mtu warning threshold, unit:byte, default:1375\n");
 	printf("    --clear                               clear any iptables rules added by this program.overrides everything\n");
+	printf("    --retry-on-error                      retry on error, allow to start udp2raw before network is initialized\n");
 	printf("    -h,--help                             print this help message\n");
 
 	//printf("common options,these options must be same on both side\n");
@@ -245,6 +257,7 @@ void process_arg(int argc, char *argv[])  //process all options
 		{"gen-rule", no_argument,    0, 'g'},
 		{"gen-add", no_argument,    0, 1},
 		{"debug", no_argument,    0, 1},
+		{"retry-on-error", no_argument,    0, 1},
 		{"clear", no_argument,    0, 1},
 		{"simple-rule", no_argument,    0, 1},
 		{"keep-rule", no_argument,    0, 1},
@@ -253,11 +266,14 @@ void process_arg(int argc, char *argv[])  //process all options
 		{"seq-mode", required_argument,    0, 1},
 		{"conf-file", required_argument,   0, 1},
 		{"force-sock-buf", no_argument,   0, 1},
+		{"wait-lock", no_argument,   0, 1},
 		{"random-drop", required_argument,    0, 1},
 		{"fifo", required_argument,    0, 1},
 		{"hb-mode", required_argument,    0, 1},
 		{"hb-len", required_argument,    0, 1},
 		{"mtu-warn", required_argument,    0, 1},
+		{"max-rst-to-show", required_argument,    0, 1},
+		{"max-rst-allowed", required_argument,    0, 1},
 		{NULL, 0, 0, 0}
 	  };
 
@@ -426,15 +442,7 @@ void process_arg(int argc, char *argv[])  //process all options
 			mylog(log_debug,"option_index: %d\n",option_index);
 			if(strcmp(long_options[option_index].name,"clear")==0)
 			{
-				char *output;
-				//int ret =system("iptables-save |grep udp2raw_dWRwMnJhdw|sed -n 's/^-A/iptables -D/p'|sh");
-				int ret =run_command("iptables -S|sed -n '/udp2rawDwrW/p'|sed -n 's/^-A/iptables -D/p'|sh",output);
-
-				int ret2 =run_command("iptables -S|sed -n '/udp2rawDwrW/p'|sed -n 's/^-N/iptables -X/p'|sh",output);
-				//system("iptables-save |grep udp2raw_dWRwMnJhdw|sed 's/^-A/iptables -D/'|sh");
-				//system("iptables-save|grep -v udp2raw_dWRwMnJhdw|iptables-restore");
-				mylog(log_info,"tried to clear all iptables rule created previously,return value %d %d\n",ret,ret2);
-				myexit(-1);
+				clear_iptables=1;
 			}
 			else if(strcmp(long_options[option_index].name,"source-ip")==0)
 			{
@@ -546,6 +554,14 @@ void process_arg(int argc, char *argv[])  //process all options
 			{
 				force_socket_buf=1;
 			}
+			else if(strcmp(long_options[option_index].name,"retry-on-error")==0)
+			{
+				retry_on_error=1;
+			}
+			else if(strcmp(long_options[option_index].name,"wait-lock")==0)
+			{
+				wait_xtables_lock=1;
+			}
 			else if(strcmp(long_options[option_index].name,"disable-bpf")==0)
 			{
 				disable_bpf_filter=1;
@@ -618,6 +634,18 @@ void process_arg(int argc, char *argv[])  //process all options
 				assert(mtu_warn>0);
 				mylog(log_info,"mtu_warn=%d \n",mtu_warn);
 			}
+			else if(strcmp(long_options[option_index].name,"max-rst-to-show")==0)
+			{
+				sscanf(optarg,"%d",&max_rst_to_show);
+				assert(max_rst_to_show>=-1);
+				mylog(log_info,"max_rst_to_show=%d \n",max_rst_to_show);
+			}
+			else if(strcmp(long_options[option_index].name,"max-rst-allowed")==0)
+			{
+				sscanf(optarg,"%d",&max_rst_allowed);
+				assert(max_rst_allowed>=-1);
+				mylog(log_info,"max_rst_allowed=%d \n",max_rst_allowed);
+			}
 			else
 			{
 				mylog(log_warn,"ignored unknown long option ,option_index:%d code:<%x>\n",option_index, optopt);
@@ -640,6 +668,7 @@ void process_arg(int argc, char *argv[])  //process all options
 		print_help();
 		myexit(-1);
 	}
+
 	//if(lower_level)
 		//process_lower_level_arg();
 
@@ -768,8 +797,30 @@ void *run_keep(void *none)  //called in a new thread for --keep-rule option
 	return NULL;
 
 }
-void iptables_rule()  // handles -a -g --gen-add  --keep-rule
+void iptables_rule()  // handles -a -g --gen-add  --keep-rule --clear --wait-lock
 {
+	if(!wait_xtables_lock)
+	{
+		iptables_command=iptables_command0;
+	}
+	else
+	{
+		iptables_command=iptables_command0+"-w ";
+	}
+
+	if(clear_iptables)
+	{
+		char *output;
+		//int ret =system("iptables-save |grep udp2raw_dWRwMnJhdw|sed -n 's/^-A/iptables -D/p'|sh");
+		int ret =run_command(iptables_command+"-S|sed -n '/udp2rawDwrW/p'|sed -n 's/^-A/"+iptables_command+"-D/p'|sh",output);
+
+		int ret2 =run_command(iptables_command+"-S|sed -n '/udp2rawDwrW/p'|sed -n 's/^-N/"+iptables_command+"-X/p'|sh",output);
+		//system("iptables-save |grep udp2raw_dWRwMnJhdw|sed 's/^-A/iptables -D/'|sh");
+		//system("iptables-save|grep -v udp2raw_dWRwMnJhdw|iptables-restore");
+		mylog(log_info,"tried to clear all iptables rule created previously,return value %d %d\n",ret,ret2);
+		myexit(-1);
+	}
+
 	if(auto_add_iptables_rule&&generate_iptables_rule)
 	{
 		mylog(log_warn," -g overrides -a\n");
@@ -872,7 +923,7 @@ void iptables_rule()  // handles -a -g --gen-add  --keep-rule
 	}
 	if(generate_iptables_rule)
 	{
-		string rule="iptables -I INPUT ";
+		string rule=iptables_command+"-I INPUT ";
 		rule+=pattern;
 		rule+=" -j DROP";
 
@@ -1042,31 +1093,6 @@ int handle_lower_level(raw_info_t &raw_info)//fill lower_level info,when --lower
 }
 
 
-
-/*
-int add_iptables_rule(const char * s)
-{
-
-	iptables_pattern=s;
-
-	string rule="iptables -I INPUT ";
-	rule+=iptables_pattern;
-	rule+=" -j DROP";
-
-	char *output;
-	if(run_command(rule.c_str(),output)==0)
-	{
-		mylog(log_warn,"auto added iptables rule by:  %s\n",rule.c_str());
-	}
-	else
-	{
-		mylog(log_fatal,"auto added iptables failed by: %s\n",rule.c_str());
-		//mylog(log_fatal,"reason : %s\n",strerror(errno));
-		myexit(-1);
-	}
-	iptables_rule_added=1;
-	return 0;
-}*/
 string chain[2];
 string rule_keep[2];
 string rule_keep_add[2];
@@ -1081,14 +1107,14 @@ int iptables_gen_add(const char * s,u32_t const_id)
 	iptables_pattern=s;
 	chain[0] =dummy+ "udp2rawDwrW_C";
 	rule_keep[0]=dummy+ iptables_pattern+" -j " +chain[0];
-	rule_keep_add[0]=dummy+"iptables -I INPUT "+rule_keep[0];
+	rule_keep_add[0]=iptables_command+"-I INPUT "+rule_keep[0];
 
 	char *output;
-	run_command(dummy+"iptables -N "+chain[0],output,show_none);
-	run_command(dummy+"iptables -F "+chain[0],output);
-	run_command(dummy+"iptables -I "+chain[0] + " -j DROP",output);
+	run_command(iptables_command+"-N "+chain[0],output,show_none);
+	run_command(iptables_command+"-F "+chain[0],output);
+	run_command(iptables_command+"-I "+chain[0] + " -j DROP",output);
 
-	rule_keep_del[0]=dummy+"iptables -D INPUT "+rule_keep[0];
+	rule_keep_del[0]=iptables_command+"-D INPUT "+rule_keep[0];
 
 	run_command(rule_keep_del[0],output,show_none);
 	run_command(rule_keep_del[0],output,show_none);
@@ -1116,11 +1142,11 @@ int iptables_rule_init(const char * s,u32_t const_id,int keep)
 	rule_keep[0]=dummy+ iptables_pattern+" -j " +chain[0];
 	rule_keep[1]=dummy+ iptables_pattern+" -j " +chain[1];
 
-	rule_keep_add[0]=dummy+"iptables -I INPUT "+rule_keep[0];
-	rule_keep_add[1]=dummy+"iptables -I INPUT "+rule_keep[1];
+	rule_keep_add[0]=iptables_command+"-I INPUT "+rule_keep[0];
+	rule_keep_add[1]=iptables_command+"-I INPUT "+rule_keep[1];
 
-	rule_keep_del[0]=dummy+"iptables -D INPUT "+rule_keep[0];
-	rule_keep_del[1]=dummy+"iptables -D INPUT "+rule_keep[1];
+	rule_keep_del[0]=iptables_command+"-D INPUT "+rule_keep[0];
+	rule_keep_del[1]=iptables_command+"-D INPUT "+rule_keep[1];
 
 	keep_rule_last_time=get_current_time();
 
@@ -1128,9 +1154,9 @@ int iptables_rule_init(const char * s,u32_t const_id,int keep)
 
 	for(int i=0;i<=iptables_rule_keeped;i++)
 	{
-		run_command(dummy+"iptables -N "+chain[i],output);
-		run_command(dummy+"iptables -F "+chain[i],output);
-		run_command(dummy+"iptables -I "+chain[i] + " -j DROP",output);
+		run_command(iptables_command+"-N "+chain[i],output);
+		run_command(iptables_command+"-F "+chain[i],output);
+		run_command(iptables_command+"-I "+chain[i] + " -j DROP",output);
 
 		if(run_command(rule_keep_add[i],output)!=0)
 		{
@@ -1167,12 +1193,12 @@ int keep_iptables_rule()  //magic to work on a machine without grep/iptables --c
 
 	int i=iptables_rule_keep_index;
 
-	run_command(dummy + "iptables -N " + chain[i], output,show_none);
+	run_command(iptables_command + "-N " + chain[i], output,show_none);
 
-	if (run_command(dummy + "iptables -F " + chain[i], output,show_none) != 0)
+	if (run_command(iptables_command + "-F " + chain[i], output,show_none) != 0)
 		mylog(log_warn, "iptables -F failed %d\n",i);
 
-	if (run_command(dummy + "iptables -I " + chain[i] + " -j DROP",output,show_none) != 0)
+	if (run_command(iptables_command + "-I " + chain[i] + " -j DROP",output,show_none) != 0)
 		mylog(log_warn, "iptables -I failed %d\n",i);
 
 	if (run_command(rule_keep_del[i], output,show_none) != 0)
@@ -1196,8 +1222,8 @@ int clear_iptables_rule()
 	for(int i=0;i<=iptables_rule_keeped;i++ )
 	{
 		run_command(rule_keep_del[i],output);
-		run_command(dummy+"iptables -F "+chain[i],output);
-		run_command(dummy+"iptables -X "+chain[i],output);
+		run_command(iptables_command+"-F "+chain[i],output);
+		run_command(iptables_command+"-X "+chain[i],output);
 	}
 	return 0;
 }

misc.h

@@ -17,6 +17,10 @@ extern int hb_mode;
 extern int hb_len;
 extern int mtu_warn;
 
+extern int max_rst_allowed;
+extern int max_rst_to_show;
+
+
 const u32_t max_handshake_conn_num=10000;
 const u32_t max_ready_conn_num=1000;
 const u32_t anti_replay_window_size=4000;
@@ -51,7 +55,7 @@ const u32_t client_conn_uplink_timeout=client_conn_timeout+2000;//ms
 const uint32_t server_conn_timeout=conv_timeout+60000;//ms. this should be 60s+ longer than conv_timeout,so that conv_manager can destruct convs gradually,to avoid latency glicth
 //const u32_t server_conn_timeout=conv_timeout+10000;//for test
 
-const u32_t iptables_rule_keep_interval=15;//unit: second;
+const u32_t iptables_rule_keep_interval=20;//unit: second;
 
 enum server_current_state_t {server_idle=0,server_handshake1,server_ready};  //server state machine
 enum client_current_state_t {client_idle=0,client_tcp_handshake,client_handshake1,client_handshake2,client_ready};//client state machine
@@ -87,6 +91,8 @@ extern int keep_rule; //whether to monitor the iptables rule periodly,re-add if
 extern int auto_add_iptables_rule;//if -a is set
 extern int generate_iptables_rule;//if -g is set
 extern int generate_iptables_rule_add;// if --gen-add is set
+extern int retry_on_error;
+const  int retry_on_error_interval=10;
 
 extern int debug_resend; // debug only
 

network.cpp

@@ -566,6 +566,13 @@ int send_raw_ip(raw_info_t &raw_info,const char * payload,int payloadlen)
 	const packet_info_t &recv_info=raw_info.recv_info;
 	char send_raw_ip_buf[buf_len];
 
+	if(raw_info.disabled)
+	{
+		mylog(log_debug,"[%s,%d]connection disabled, no packet will be sent\n",my_ntoa(recv_info.src_ip),recv_info.src_port);
+		assert(max_rst_allowed>=0);
+		return 0;
+	}
+
 	struct iphdr *iph = (struct iphdr *) send_raw_ip_buf;
     memset(iph,0,sizeof(iphdr));
 
@@ -704,7 +711,13 @@ int recv_raw_ip(raw_info_t &raw_info,char * &payload,int &payloadlen)
 	struct sockaddr_ll saddr={0};
 	socklen_t saddr_size = sizeof(saddr);
 	int flag=0;
-	int recv_len = recvfrom(raw_recv_fd, recv_raw_ip_buf, max_data_len, flag ,(sockaddr*)&saddr , &saddr_size);
+	int recv_len = recvfrom(raw_recv_fd, recv_raw_ip_buf, max_data_len+1, flag ,(sockaddr*)&saddr , &saddr_size);
+
+	if(recv_len==max_data_len+1)
+	{
+		mylog(log_warn,"huge packet, data_len > %d,dropped\n",max_data_len);
+		return -1;
+	}
 
 	if(recv_len<0)
 	{
@@ -1439,7 +1452,37 @@ int recv_raw_tcp(raw_info_t &raw_info,char * &payload,int &payloadlen)
 
     if(tcph->rst==1)
     {
-    	mylog(log_error,"[%s,%d]rst==1\n",my_ntoa(recv_info.src_ip),recv_info.src_port);
+		raw_info.rst_received++;
+
+    	if(max_rst_to_show>0)
+    	{
+    		if(raw_info.rst_received < max_rst_to_show)
+    		{
+    			mylog(log_warn,"[%s,%d]rst==1,cnt=%d\n",my_ntoa(recv_info.src_ip),recv_info.src_port,(int)raw_info.rst_received);
+    		}
+    		else if(raw_info.rst_received == max_rst_to_show)
+    		{
+    			mylog(log_warn,"[%s,%d]rst==1,cnt=%d >=max_rst_to_show, this log will be muted for current connection\n",my_ntoa(recv_info.src_ip),recv_info.src_port,(int)raw_info.rst_received);
+    		}
+    		else
+    		{
+    			mylog(log_debug,"[%s,%d]rst==1,cnt=%d\n",my_ntoa(recv_info.src_ip),recv_info.src_port,(int)raw_info.rst_received);
+    		}
+    	}
+    	else if(max_rst_to_show==0)
+    	{
+    		mylog(log_debug,"[%s,%d]rst==1,cnt=%d\n",my_ntoa(recv_info.src_ip),recv_info.src_port,(int)raw_info.rst_received);
+    	}
+    	else
+    	{
+    		mylog(log_warn,"[%s,%d]rst==1,cnt=%d\n",my_ntoa(recv_info.src_ip),recv_info.src_port,(int)raw_info.rst_received);
+    	}
+
+		if(max_rst_allowed>=0 && raw_info.rst_received==max_rst_allowed+1 )
+		{
+			mylog(log_warn,"[%s,%d]connection disabled because of rst_received=%d > max_rst_allow=%d\n",my_ntoa(recv_info.src_ip),recv_info.src_port,(int)raw_info.rst_received,(int)max_rst_allowed );
+			raw_info.disabled=1;
+		}
     }
 
    /* if(recv_info.has_ts)

network.h

@@ -77,12 +77,13 @@ struct raw_info_t
 {
 	packet_info_t send_info;
 	packet_info_t recv_info;
-
 	//int last_send_len;
 	//int last_recv_len;
 
 	u32_t reserved_send_seq;
 	//uint32_t first_seq,first_ack_seq;
+	int rst_received=0;
+	bool disabled=0;
 
 };//g_raw_info;
 

third-party/luci-app-udp2raw/moved_to_new_repo

@@ -0,0 +1 @@
+https://github.com/sensec/luci-app-udp2raw

third-party/udp2raw-openwrt-makefile/moved_to_new_repo

@@ -0,0 +1 @@
+https://github.com/sensec/openwrt-udp2raw